</option>\r
<option id="xilinx.gnu.compiler.dircategory.includes.788537379" name="Include Paths" superClass="xilinx.gnu.compiler.dircategory.includes" valueType="includePath">\r
<listOptionValue builtIn="false" value=""${workspace_loc:/${ProjName}}""/>\r
+ <listOptionValue builtIn="false" value=""${workspace_loc:/${ProjName}/lwIP/lwIP_Apps}""/>\r
+ <listOptionValue builtIn="false" value=""${workspace_loc:/${ProjName}/lwIP/include}""/>\r
<listOptionValue builtIn="false" value=""${workspace_loc:/${ProjName}/Demo_Source/include}""/>\r
<listOptionValue builtIn="false" value=""${workspace_loc:/${ProjName}/FreeRTOS_Source/include}""/>\r
<listOptionValue builtIn="false" value=""${workspace_loc:/${ProjName}/FreeRTOS_Source/portable/GCC/MicroBlaze}""/>\r
REM Have the files already been copied?\r
IF EXIST FreeRTOS_Source Goto END\r
\r
- REM Create the required directory structure.\r
- MD FreeRTOS_Source\r
- MD FreeRTOS_Source\include \r
- MD FreeRTOS_Source\portable\GCC\r
- MD FreeRTOS_Source\portable\GCC\MicroBlaze\r
- MD FreeRTOS_Source\portable\MemMang \r
- MD Demo_Source\r
- MD Demo_Source\include\r
- \r
- REM Copy the core kernel files.\r
- copy ..\..\..\..\Source\tasks.c FreeRTOS_Source\r
- copy ..\..\..\..\Source\queue.c FreeRTOS_Source\r
- copy ..\..\..\..\Source\list.c FreeRTOS_Source\r
- copy ..\..\..\..\Source\timers.c FreeRTOS_Source\r
- \r
- REM Copy the common header files\r
-\r
- copy ..\..\..\..\Source\include\*.* FreeRTOS_Source\include\r
- \r
- REM Copy the portable layer files\r
- copy ..\..\..\..\Source\portable\GCC\MicroBlaze\*.* FreeRTOS_Source\portable\GCC\MicroBlaze\r
- \r
- REM Copy the basic memory allocation files\r
- copy ..\..\..\..\Source\portable\MemMang\heap_2.c FreeRTOS_Source\portable\MemMang\r
+ REM Create the required directory structure.\r
+ MD FreeRTOS_Source\r
+ MD FreeRTOS_Source\include \r
+ MD FreeRTOS_Source\portable\GCC\r
+ MD FreeRTOS_Source\portable\GCC\MicroBlaze\r
+ MD FreeRTOS_Source\portable\MemMang \r
+ MD Demo_Source\r
+ MD Demo_Source\include\r
+ MD lwIP\api\r
+ MD lwIP\core\r
+ MD lwIP\core\ipv4\r
+ MD lwIP\include\r
+ MD lwIP\include\ipv4\r
+ MD lwIP\include\ipv4\lwip\r
+ MD lwIP\include\lwip\r
+ MD lwIP\include\netif\r
+ MD lwIP\netif\r
+ MD lwIP\netif\include\r
+ MD lwIP\netif\include\arch\r
+ \r
+ REM Copy the core kernel files.\r
+ copy ..\..\..\..\Source\tasks.c FreeRTOS_Source\r
+ copy ..\..\..\..\Source\queue.c FreeRTOS_Source\r
+ copy ..\..\..\..\Source\list.c FreeRTOS_Source\r
+ copy ..\..\..\..\Source\timers.c FreeRTOS_Source\r
+ \r
+ REM Copy the common header files\r
+ copy ..\..\..\..\Source\include\*.* FreeRTOS_Source\include\r
+ \r
+ REM Copy the portable layer files\r
+ copy ..\..\..\..\Source\portable\GCC\MicroBlaze\*.* FreeRTOS_Source\portable\GCC\MicroBlaze\r
+ \r
+ REM Copy the basic memory allocation files\r
+ copy ..\..\..\..\Source\portable\MemMang\heap_2.c FreeRTOS_Source\portable\MemMang\r
\r
- REM Copy the files that define the common demo tasks.\r
+ REM Copy the files that define the common demo tasks.\r
copy ..\..\..\Common\minimal\dynamic.c Demo_Source\r
copy ..\..\..\Common\minimal\BlockQ.c Demo_Source\r
copy ..\..\..\Common\minimal\death.c Demo_Source\r
copy ..\..\..\Common\minimal\sp_flop.c Demo_Source\r
copy ..\..\..\Common\minimal\flash.c Demo_Source\r
copy ..\..\..\Common\minimal\comtest_strings.c Demo_Source\r
- copy ..\..\..\Common\minimal\TimerDemo.c Demo_Source\r
- \r
- REM Copy the common demo file headers.\r
+ copy ..\..\..\Common\minimal\TimerDemo.c Demo_Source\r
+ \r
+ REM Copy the common demo file headers.\r
copy ..\..\..\Common\include\dynamic.h Demo_Source\include\r
copy ..\..\..\Common\include\partest.h Demo_Source\include\r
copy ..\..\..\Common\include\BlockQ.h Demo_Source\include\r
copy ..\..\..\Common\include\QPeek.h Demo_Source\include\r
copy ..\..\..\Common\include\recmutex.h Demo_Source\include\r
copy ..\..\..\Common\include\flop.h Demo_Source\include\r
- copy ..\..\..\Common\include\flash.h Demo_Source\include\r
+ copy ..\..\..\Common\include\flash.h Demo_Source\includeREM\r
copy ..\..\..\Common\include\comtest_strings.h Demo_Source\include\r
copy ..\..\..\Common\include\serial.h Demo_Source\include\r
copy ..\..\..\Common\include\comtest.h Demo_Source\include\r
- copy ..\..\..\Common\include\TimerDemo.h Demo_Source\include\r
+ copy ..\..\..\Common\include\TimerDemo.h Demo_Source\include\r
\r
+ REM Copy the required lwIP files\r
+ copy ..\..\..\Common\ethernet\lwip-1.4.0\src\api\*.c lwIP\api\r
+ copy ..\..\..\Common\ethernet\lwip-1.4.0\src\core\*.c lwIP\core\r
+ copy ..\..\..\Common\ethernet\lwip-1.4.0\src\core\ipv4\*.c lwIP\core\ipv4\r
+ copy ..\..\..\Common\ethernet\lwip-1.4.0\src\include\ipv4\lwip\*.h lwIP\include\ipv4\lwip\r
+ copy ..\..\..\Common\ethernet\lwip-1.4.0\src\include\lwip\*.h lwIP\include\lwip\r
+ copy ..\..\..\Common\ethernet\lwip-1.4.0\src\include\netif\*.h lwIP\include\netif\r
+ copy ..\..\..\Common\ethernet\lwip-1.4.0\src\netif\etharp.c lwIP\netif\r
+ copy ..\..\..\Common\ethernet\lwip-1.4.0\ports\MicroBlaze-Ethernet-Lite lwip\netif\r
+ copy ..\..\..\Common\ethernet\lwip-1.4.0\ports\MicroBlaze-Ethernet-Lite\include\arch lwip\netif\include\arch\r
+\r
: END\r
--- /dev/null
+/**
+ * @file
+ * Sequential API External module
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+/* This is the part of the API that is linked with
+ the application */
+
+#include "lwip/opt.h"
+
+#if LWIP_NETCONN /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/api.h"
+#include "lwip/tcpip.h"
+#include "lwip/memp.h"
+
+#include "lwip/ip.h"
+#include "lwip/raw.h"
+#include "lwip/udp.h"
+#include "lwip/tcp.h"
+
+#include <string.h>
+
+/**
+ * Create a new netconn (of a specific type) that has a callback function.
+ * The corresponding pcb is also created.
+ *
+ * @param t the type of 'connection' to create (@see enum netconn_type)
+ * @param proto the IP protocol for RAW IP pcbs
+ * @param callback a function to call on status changes (RX available, TX'ed)
+ * @return a newly allocated struct netconn or
+ * NULL on memory error
+ */
+struct netconn*
+netconn_new_with_proto_and_callback(enum netconn_type t, u8_t proto, netconn_callback callback)
+{
+ struct netconn *conn;
+ struct api_msg msg;
+
+ conn = netconn_alloc(t, callback);
+ if (conn != NULL) {
+ msg.function = do_newconn;
+ msg.msg.msg.n.proto = proto;
+ msg.msg.conn = conn;
+ if (TCPIP_APIMSG(&msg) != ERR_OK) {
+ LWIP_ASSERT("freeing conn without freeing pcb", conn->pcb.tcp == NULL);
+ LWIP_ASSERT("conn has no op_completed", sys_sem_valid(&conn->op_completed));
+ LWIP_ASSERT("conn has no recvmbox", sys_mbox_valid(&conn->recvmbox));
+#if LWIP_TCP
+ LWIP_ASSERT("conn->acceptmbox shouldn't exist", !sys_mbox_valid(&conn->acceptmbox));
+#endif /* LWIP_TCP */
+ sys_sem_free(&conn->op_completed);
+ sys_mbox_free(&conn->recvmbox);
+ memp_free(MEMP_NETCONN, conn);
+ return NULL;
+ }
+ }
+ return conn;
+}
+
+/**
+ * Close a netconn 'connection' and free its resources.
+ * UDP and RAW connection are completely closed, TCP pcbs might still be in a waitstate
+ * after this returns.
+ *
+ * @param conn the netconn to delete
+ * @return ERR_OK if the connection was deleted
+ */
+err_t
+netconn_delete(struct netconn *conn)
+{
+ struct api_msg msg;
+
+ /* No ASSERT here because possible to get a (conn == NULL) if we got an accept error */
+ if (conn == NULL) {
+ return ERR_OK;
+ }
+
+ msg.function = do_delconn;
+ msg.msg.conn = conn;
+ tcpip_apimsg(&msg);
+
+ netconn_free(conn);
+
+ /* don't care for return value of do_delconn since it only calls void functions */
+
+ return ERR_OK;
+}
+
+/**
+ * Get the local or remote IP address and port of a netconn.
+ * For RAW netconns, this returns the protocol instead of a port!
+ *
+ * @param conn the netconn to query
+ * @param addr a pointer to which to save the IP address
+ * @param port a pointer to which to save the port (or protocol for RAW)
+ * @param local 1 to get the local IP address, 0 to get the remote one
+ * @return ERR_CONN for invalid connections
+ * ERR_OK if the information was retrieved
+ */
+err_t
+netconn_getaddr(struct netconn *conn, ip_addr_t *addr, u16_t *port, u8_t local)
+{
+ struct api_msg msg;
+ err_t err;
+
+ LWIP_ERROR("netconn_getaddr: invalid conn", (conn != NULL), return ERR_ARG;);
+ LWIP_ERROR("netconn_getaddr: invalid addr", (addr != NULL), return ERR_ARG;);
+ LWIP_ERROR("netconn_getaddr: invalid port", (port != NULL), return ERR_ARG;);
+
+ msg.function = do_getaddr;
+ msg.msg.conn = conn;
+ msg.msg.msg.ad.ipaddr = addr;
+ msg.msg.msg.ad.port = port;
+ msg.msg.msg.ad.local = local;
+ err = TCPIP_APIMSG(&msg);
+
+ NETCONN_SET_SAFE_ERR(conn, err);
+ return err;
+}
+
+/**
+ * Bind a netconn to a specific local IP address and port.
+ * Binding one netconn twice might not always be checked correctly!
+ *
+ * @param conn the netconn to bind
+ * @param addr the local IP address to bind the netconn to (use IP_ADDR_ANY
+ * to bind to all addresses)
+ * @param port the local port to bind the netconn to (not used for RAW)
+ * @return ERR_OK if bound, any other err_t on failure
+ */
+err_t
+netconn_bind(struct netconn *conn, ip_addr_t *addr, u16_t port)
+{
+ struct api_msg msg;
+ err_t err;
+
+ LWIP_ERROR("netconn_bind: invalid conn", (conn != NULL), return ERR_ARG;);
+
+ msg.function = do_bind;
+ msg.msg.conn = conn;
+ msg.msg.msg.bc.ipaddr = addr;
+ msg.msg.msg.bc.port = port;
+ err = TCPIP_APIMSG(&msg);
+
+ NETCONN_SET_SAFE_ERR(conn, err);
+ return err;
+}
+
+/**
+ * Connect a netconn to a specific remote IP address and port.
+ *
+ * @param conn the netconn to connect
+ * @param addr the remote IP address to connect to
+ * @param port the remote port to connect to (no used for RAW)
+ * @return ERR_OK if connected, return value of tcp_/udp_/raw_connect otherwise
+ */
+err_t
+netconn_connect(struct netconn *conn, ip_addr_t *addr, u16_t port)
+{
+ struct api_msg msg;
+ err_t err;
+
+ LWIP_ERROR("netconn_connect: invalid conn", (conn != NULL), return ERR_ARG;);
+
+ msg.function = do_connect;
+ msg.msg.conn = conn;
+ msg.msg.msg.bc.ipaddr = addr;
+ msg.msg.msg.bc.port = port;
+ /* This is the only function which need to not block tcpip_thread */
+ err = tcpip_apimsg(&msg);
+
+ NETCONN_SET_SAFE_ERR(conn, err);
+ return err;
+}
+
+/**
+ * Disconnect a netconn from its current peer (only valid for UDP netconns).
+ *
+ * @param conn the netconn to disconnect
+ * @return TODO: return value is not set here...
+ */
+err_t
+netconn_disconnect(struct netconn *conn)
+{
+ struct api_msg msg;
+ err_t err;
+
+ LWIP_ERROR("netconn_disconnect: invalid conn", (conn != NULL), return ERR_ARG;);
+
+ msg.function = do_disconnect;
+ msg.msg.conn = conn;
+ err = TCPIP_APIMSG(&msg);
+
+ NETCONN_SET_SAFE_ERR(conn, err);
+ return err;
+}
+
+/**
+ * Set a TCP netconn into listen mode
+ *
+ * @param conn the tcp netconn to set to listen mode
+ * @param backlog the listen backlog, only used if TCP_LISTEN_BACKLOG==1
+ * @return ERR_OK if the netconn was set to listen (UDP and RAW netconns
+ * don't return any error (yet?))
+ */
+err_t
+netconn_listen_with_backlog(struct netconn *conn, u8_t backlog)
+{
+#if LWIP_TCP
+ struct api_msg msg;
+ err_t err;
+
+ /* This does no harm. If TCP_LISTEN_BACKLOG is off, backlog is unused. */
+ LWIP_UNUSED_ARG(backlog);
+
+ LWIP_ERROR("netconn_listen: invalid conn", (conn != NULL), return ERR_ARG;);
+
+ msg.function = do_listen;
+ msg.msg.conn = conn;
+#if TCP_LISTEN_BACKLOG
+ msg.msg.msg.lb.backlog = backlog;
+#endif /* TCP_LISTEN_BACKLOG */
+ err = TCPIP_APIMSG(&msg);
+
+ NETCONN_SET_SAFE_ERR(conn, err);
+ return err;
+#else /* LWIP_TCP */
+ LWIP_UNUSED_ARG(conn);
+ LWIP_UNUSED_ARG(backlog);
+ return ERR_ARG;
+#endif /* LWIP_TCP */
+}
+
+/**
+ * Accept a new connection on a TCP listening netconn.
+ *
+ * @param conn the TCP listen netconn
+ * @param new_conn pointer where the new connection is stored
+ * @return ERR_OK if a new connection has been received or an error
+ * code otherwise
+ */
+err_t
+netconn_accept(struct netconn *conn, struct netconn **new_conn)
+{
+#if LWIP_TCP
+ struct netconn *newconn;
+ err_t err;
+#if TCP_LISTEN_BACKLOG
+ struct api_msg msg;
+#endif /* TCP_LISTEN_BACKLOG */
+
+ LWIP_ERROR("netconn_accept: invalid pointer", (new_conn != NULL), return ERR_ARG;);
+ *new_conn = NULL;
+ LWIP_ERROR("netconn_accept: invalid conn", (conn != NULL), return ERR_ARG;);
+ LWIP_ERROR("netconn_accept: invalid acceptmbox", sys_mbox_valid(&conn->acceptmbox), return ERR_ARG;);
+
+ err = conn->last_err;
+ if (ERR_IS_FATAL(err)) {
+ /* don't recv on fatal errors: this might block the application task
+ waiting on acceptmbox forever! */
+ return err;
+ }
+
+#if LWIP_SO_RCVTIMEO
+ if (sys_arch_mbox_fetch(&conn->acceptmbox, (void **)&newconn, conn->recv_timeout) == SYS_ARCH_TIMEOUT) {
+ NETCONN_SET_SAFE_ERR(conn, ERR_TIMEOUT);
+ return ERR_TIMEOUT;
+ }
+#else
+ sys_arch_mbox_fetch(&conn->acceptmbox, (void **)&newconn, 0);
+#endif /* LWIP_SO_RCVTIMEO*/
+ /* Register event with callback */
+ API_EVENT(conn, NETCONN_EVT_RCVMINUS, 0);
+
+ if (newconn == NULL) {
+ /* connection has been aborted */
+ NETCONN_SET_SAFE_ERR(conn, ERR_ABRT);
+ return ERR_ABRT;
+ }
+#if TCP_LISTEN_BACKLOG
+ /* Let the stack know that we have accepted the connection. */
+ msg.function = do_recv;
+ msg.msg.conn = conn;
+ /* don't care for the return value of do_recv */
+ TCPIP_APIMSG(&msg);
+#endif /* TCP_LISTEN_BACKLOG */
+
+ *new_conn = newconn;
+ /* don't set conn->last_err: it's only ERR_OK, anyway */
+ return ERR_OK;
+#else /* LWIP_TCP */
+ LWIP_UNUSED_ARG(conn);
+ LWIP_UNUSED_ARG(new_conn);
+ return ERR_ARG;
+#endif /* LWIP_TCP */
+}
+
+/**
+ * Receive data: actual implementation that doesn't care whether pbuf or netbuf
+ * is received
+ *
+ * @param conn the netconn from which to receive data
+ * @param new_buf pointer where a new pbuf/netbuf is stored when received data
+ * @return ERR_OK if data has been received, an error code otherwise (timeout,
+ * memory error or another error)
+ */
+static err_t
+netconn_recv_data(struct netconn *conn, void **new_buf)
+{
+ void *buf = NULL;
+ u16_t len;
+ err_t err;
+#if LWIP_TCP
+ struct api_msg msg;
+#endif /* LWIP_TCP */
+
+ LWIP_ERROR("netconn_recv: invalid pointer", (new_buf != NULL), return ERR_ARG;);
+ *new_buf = NULL;
+ LWIP_ERROR("netconn_recv: invalid conn", (conn != NULL), return ERR_ARG;);
+ LWIP_ERROR("netconn_accept: invalid recvmbox", sys_mbox_valid(&conn->recvmbox), return ERR_CONN;);
+
+ err = conn->last_err;
+ if (ERR_IS_FATAL(err)) {
+ /* don't recv on fatal errors: this might block the application task
+ waiting on recvmbox forever! */
+ /* @todo: this does not allow us to fetch data that has been put into recvmbox
+ before the fatal error occurred - is that a problem? */
+ return err;
+ }
+
+#if LWIP_SO_RCVTIMEO
+ if (sys_arch_mbox_fetch(&conn->recvmbox, &buf, conn->recv_timeout) == SYS_ARCH_TIMEOUT) {
+ NETCONN_SET_SAFE_ERR(conn, ERR_TIMEOUT);
+ return ERR_TIMEOUT;
+ }
+#else
+ sys_arch_mbox_fetch(&conn->recvmbox, &buf, 0);
+#endif /* LWIP_SO_RCVTIMEO*/
+
+#if LWIP_TCP
+ if (conn->type == NETCONN_TCP) {
+ if (!netconn_get_noautorecved(conn) || (buf == NULL)) {
+ /* Let the stack know that we have taken the data. */
+ /* TODO: Speedup: Don't block and wait for the answer here
+ (to prevent multiple thread-switches). */
+ msg.function = do_recv;
+ msg.msg.conn = conn;
+ if (buf != NULL) {
+ msg.msg.msg.r.len = ((struct pbuf *)buf)->tot_len;
+ } else {
+ msg.msg.msg.r.len = 1;
+ }
+ /* don't care for the return value of do_recv */
+ TCPIP_APIMSG(&msg);
+ }
+
+ /* If we are closed, we indicate that we no longer wish to use the socket */
+ if (buf == NULL) {
+ API_EVENT(conn, NETCONN_EVT_RCVMINUS, 0);
+ /* Avoid to lose any previous error code */
+ NETCONN_SET_SAFE_ERR(conn, ERR_CLSD);
+ return ERR_CLSD;
+ }
+ len = ((struct pbuf *)buf)->tot_len;
+ }
+#endif /* LWIP_TCP */
+#if LWIP_TCP && (LWIP_UDP || LWIP_RAW)
+ else
+#endif /* LWIP_TCP && (LWIP_UDP || LWIP_RAW) */
+#if (LWIP_UDP || LWIP_RAW)
+ {
+ LWIP_ASSERT("buf != NULL", buf != NULL);
+ len = netbuf_len((struct netbuf *)buf);
+ }
+#endif /* (LWIP_UDP || LWIP_RAW) */
+
+#if LWIP_SO_RCVBUF
+ SYS_ARCH_DEC(conn->recv_avail, len);
+#endif /* LWIP_SO_RCVBUF */
+ /* Register event with callback */
+ API_EVENT(conn, NETCONN_EVT_RCVMINUS, len);
+
+ LWIP_DEBUGF(API_LIB_DEBUG, ("netconn_recv_data: received %p, len=%"U16_F"\n", buf, len));
+
+ *new_buf = buf;
+ /* don't set conn->last_err: it's only ERR_OK, anyway */
+ return ERR_OK;
+}
+
+/**
+ * Receive data (in form of a pbuf) from a TCP netconn
+ *
+ * @param conn the netconn from which to receive data
+ * @param new_buf pointer where a new pbuf is stored when received data
+ * @return ERR_OK if data has been received, an error code otherwise (timeout,
+ * memory error or another error)
+ * ERR_ARG if conn is not a TCP netconn
+ */
+err_t
+netconn_recv_tcp_pbuf(struct netconn *conn, struct pbuf **new_buf)
+{
+ LWIP_ERROR("netconn_recv: invalid conn", (conn != NULL) &&
+ netconn_type(conn) == NETCONN_TCP, return ERR_ARG;);
+
+ return netconn_recv_data(conn, (void **)new_buf);
+}
+
+/**
+ * Receive data (in form of a netbuf containing a packet buffer) from a netconn
+ *
+ * @param conn the netconn from which to receive data
+ * @param new_buf pointer where a new netbuf is stored when received data
+ * @return ERR_OK if data has been received, an error code otherwise (timeout,
+ * memory error or another error)
+ */
+err_t
+netconn_recv(struct netconn *conn, struct netbuf **new_buf)
+{
+#if LWIP_TCP
+ struct netbuf *buf = NULL;
+ err_t err;
+#endif /* LWIP_TCP */
+
+ LWIP_ERROR("netconn_recv: invalid pointer", (new_buf != NULL), return ERR_ARG;);
+ *new_buf = NULL;
+ LWIP_ERROR("netconn_recv: invalid conn", (conn != NULL), return ERR_ARG;);
+ LWIP_ERROR("netconn_accept: invalid recvmbox", sys_mbox_valid(&conn->recvmbox), return ERR_CONN;);
+
+#if LWIP_TCP
+ if (conn->type == NETCONN_TCP) {
+ struct pbuf *p = NULL;
+ /* This is not a listening netconn, since recvmbox is set */
+
+ buf = (struct netbuf *)memp_malloc(MEMP_NETBUF);
+ if (buf == NULL) {
+ NETCONN_SET_SAFE_ERR(conn, ERR_MEM);
+ return ERR_MEM;
+ }
+
+ err = netconn_recv_data(conn, (void **)&p);
+ if (err != ERR_OK) {
+ memp_free(MEMP_NETBUF, buf);
+ return err;
+ }
+ LWIP_ASSERT("p != NULL", p != NULL);
+
+ buf->p = p;
+ buf->ptr = p;
+ buf->port = 0;
+ ip_addr_set_any(&buf->addr);
+ *new_buf = buf;
+ /* don't set conn->last_err: it's only ERR_OK, anyway */
+ return ERR_OK;
+ } else
+#endif /* LWIP_TCP */
+ {
+#if (LWIP_UDP || LWIP_RAW)
+ return netconn_recv_data(conn, (void **)new_buf);
+#endif /* (LWIP_UDP || LWIP_RAW) */
+ }
+}
+
+/**
+ * TCP: update the receive window: by calling this, the application
+ * tells the stack that it has processed data and is able to accept
+ * new data.
+ * ATTENTION: use with care, this is mainly used for sockets!
+ * Can only be used when calling netconn_set_noautorecved(conn, 1) before.
+ *
+ * @param conn the netconn for which to update the receive window
+ * @param length amount of data processed (ATTENTION: this must be accurate!)
+ */
+void
+netconn_recved(struct netconn *conn, u32_t length)
+{
+#if LWIP_TCP
+ if ((conn != NULL) && (conn->type == NETCONN_TCP) &&
+ (netconn_get_noautorecved(conn))) {
+ struct api_msg msg;
+ /* Let the stack know that we have taken the data. */
+ /* TODO: Speedup: Don't block and wait for the answer here
+ (to prevent multiple thread-switches). */
+ msg.function = do_recv;
+ msg.msg.conn = conn;
+ msg.msg.msg.r.len = length;
+ /* don't care for the return value of do_recv */
+ TCPIP_APIMSG(&msg);
+ }
+#else /* LWIP_TCP */
+ LWIP_UNUSED_ARG(conn);
+ LWIP_UNUSED_ARG(length);
+#endif /* LWIP_TCP */
+}
+
+/**
+ * Send data (in form of a netbuf) to a specific remote IP address and port.
+ * Only to be used for UDP and RAW netconns (not TCP).
+ *
+ * @param conn the netconn over which to send data
+ * @param buf a netbuf containing the data to send
+ * @param addr the remote IP address to which to send the data
+ * @param port the remote port to which to send the data
+ * @return ERR_OK if data was sent, any other err_t on error
+ */
+err_t
+netconn_sendto(struct netconn *conn, struct netbuf *buf, ip_addr_t *addr, u16_t port)
+{
+ if (buf != NULL) {
+ ip_addr_set(&buf->addr, addr);
+ buf->port = port;
+ return netconn_send(conn, buf);
+ }
+ return ERR_VAL;
+}
+
+/**
+ * Send data over a UDP or RAW netconn (that is already connected).
+ *
+ * @param conn the UDP or RAW netconn over which to send data
+ * @param buf a netbuf containing the data to send
+ * @return ERR_OK if data was sent, any other err_t on error
+ */
+err_t
+netconn_send(struct netconn *conn, struct netbuf *buf)
+{
+ struct api_msg msg;
+ err_t err;
+
+ LWIP_ERROR("netconn_send: invalid conn", (conn != NULL), return ERR_ARG;);
+
+ LWIP_DEBUGF(API_LIB_DEBUG, ("netconn_send: sending %"U16_F" bytes\n", buf->p->tot_len));
+ msg.function = do_send;
+ msg.msg.conn = conn;
+ msg.msg.msg.b = buf;
+ err = TCPIP_APIMSG(&msg);
+
+ NETCONN_SET_SAFE_ERR(conn, err);
+ return err;
+}
+
+/**
+ * Send data over a TCP netconn.
+ *
+ * @param conn the TCP netconn over which to send data
+ * @param dataptr pointer to the application buffer that contains the data to send
+ * @param size size of the application data to send
+ * @param apiflags combination of following flags :
+ * - NETCONN_COPY: data will be copied into memory belonging to the stack
+ * - NETCONN_MORE: for TCP connection, PSH flag will be set on last segment sent
+ * - NETCONN_DONTBLOCK: only write the data if all dat can be written at once
+ * @return ERR_OK if data was sent, any other err_t on error
+ */
+err_t
+netconn_write(struct netconn *conn, const void *dataptr, size_t size, u8_t apiflags)
+{
+ struct api_msg msg;
+ err_t err;
+
+ LWIP_ERROR("netconn_write: invalid conn", (conn != NULL), return ERR_ARG;);
+ LWIP_ERROR("netconn_write: invalid conn->type", (conn->type == NETCONN_TCP), return ERR_VAL;);
+ if (size == 0) {
+ return ERR_OK;
+ }
+
+ /* @todo: for non-blocking write, check if 'size' would ever fit into
+ snd_queue or snd_buf */
+ msg.function = do_write;
+ msg.msg.conn = conn;
+ msg.msg.msg.w.dataptr = dataptr;
+ msg.msg.msg.w.apiflags = apiflags;
+ msg.msg.msg.w.len = size;
+ /* For locking the core: this _can_ be delayed on low memory/low send buffer,
+ but if it is, this is done inside api_msg.c:do_write(), so we can use the
+ non-blocking version here. */
+ err = TCPIP_APIMSG(&msg);
+
+ NETCONN_SET_SAFE_ERR(conn, err);
+ return err;
+}
+
+/**
+ * Close ot shutdown a TCP netconn (doesn't delete it).
+ *
+ * @param conn the TCP netconn to close or shutdown
+ * @param how fully close or only shutdown one side?
+ * @return ERR_OK if the netconn was closed, any other err_t on error
+ */
+static err_t
+netconn_close_shutdown(struct netconn *conn, u8_t how)
+{
+ struct api_msg msg;
+ err_t err;
+
+ LWIP_ERROR("netconn_close: invalid conn", (conn != NULL), return ERR_ARG;);
+
+ msg.function = do_close;
+ msg.msg.conn = conn;
+ /* shutting down both ends is the same as closing */
+ msg.msg.msg.sd.shut = how;
+ /* because of the LWIP_TCPIP_CORE_LOCKING implementation of do_close,
+ don't use TCPIP_APIMSG here */
+ err = tcpip_apimsg(&msg);
+
+ NETCONN_SET_SAFE_ERR(conn, err);
+ return err;
+}
+
+/**
+ * Close a TCP netconn (doesn't delete it).
+ *
+ * @param conn the TCP netconn to close
+ * @return ERR_OK if the netconn was closed, any other err_t on error
+ */
+err_t
+netconn_close(struct netconn *conn)
+{
+ /* shutting down both ends is the same as closing */
+ return netconn_close_shutdown(conn, NETCONN_SHUT_RDWR);
+}
+
+/**
+ * Shut down one or both sides of a TCP netconn (doesn't delete it).
+ *
+ * @param conn the TCP netconn to shut down
+ * @return ERR_OK if the netconn was closed, any other err_t on error
+ */
+err_t
+netconn_shutdown(struct netconn *conn, u8_t shut_rx, u8_t shut_tx)
+{
+ return netconn_close_shutdown(conn, (shut_rx ? NETCONN_SHUT_RD : 0) | (shut_tx ? NETCONN_SHUT_WR : 0));
+}
+
+#if LWIP_IGMP
+/**
+ * Join multicast groups for UDP netconns.
+ *
+ * @param conn the UDP netconn for which to change multicast addresses
+ * @param multiaddr IP address of the multicast group to join or leave
+ * @param netif_addr the IP address of the network interface on which to send
+ * the igmp message
+ * @param join_or_leave flag whether to send a join- or leave-message
+ * @return ERR_OK if the action was taken, any err_t on error
+ */
+err_t
+netconn_join_leave_group(struct netconn *conn,
+ ip_addr_t *multiaddr,
+ ip_addr_t *netif_addr,
+ enum netconn_igmp join_or_leave)
+{
+ struct api_msg msg;
+ err_t err;
+
+ LWIP_ERROR("netconn_join_leave_group: invalid conn", (conn != NULL), return ERR_ARG;);
+
+ msg.function = do_join_leave_group;
+ msg.msg.conn = conn;
+ msg.msg.msg.jl.multiaddr = multiaddr;
+ msg.msg.msg.jl.netif_addr = netif_addr;
+ msg.msg.msg.jl.join_or_leave = join_or_leave;
+ err = TCPIP_APIMSG(&msg);
+
+ NETCONN_SET_SAFE_ERR(conn, err);
+ return err;
+}
+#endif /* LWIP_IGMP */
+
+#if LWIP_DNS
+/**
+ * Execute a DNS query, only one IP address is returned
+ *
+ * @param name a string representation of the DNS host name to query
+ * @param addr a preallocated ip_addr_t where to store the resolved IP address
+ * @return ERR_OK: resolving succeeded
+ * ERR_MEM: memory error, try again later
+ * ERR_ARG: dns client not initialized or invalid hostname
+ * ERR_VAL: dns server response was invalid
+ */
+err_t
+netconn_gethostbyname(const char *name, ip_addr_t *addr)
+{
+ struct dns_api_msg msg;
+ err_t err;
+ sys_sem_t sem;
+
+ LWIP_ERROR("netconn_gethostbyname: invalid name", (name != NULL), return ERR_ARG;);
+ LWIP_ERROR("netconn_gethostbyname: invalid addr", (addr != NULL), return ERR_ARG;);
+
+ err = sys_sem_new(&sem, 0);
+ if (err != ERR_OK) {
+ return err;
+ }
+
+ msg.name = name;
+ msg.addr = addr;
+ msg.err = &err;
+ msg.sem = &sem;
+
+ tcpip_callback(do_gethostbyname, &msg);
+ sys_sem_wait(&sem);
+ sys_sem_free(&sem);
+
+ return err;
+}
+#endif /* LWIP_DNS*/
+
+#endif /* LWIP_NETCONN */
--- /dev/null
+/**
+ * @file
+ * Sequential API Internal module
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_NETCONN /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/api_msg.h"
+
+#include "lwip/ip.h"
+#include "lwip/udp.h"
+#include "lwip/tcp.h"
+#include "lwip/raw.h"
+
+#include "lwip/memp.h"
+#include "lwip/tcpip.h"
+#include "lwip/igmp.h"
+#include "lwip/dns.h"
+
+#include <string.h>
+
+#define SET_NONBLOCKING_CONNECT(conn, val) do { if(val) { \
+ (conn)->flags |= NETCONN_FLAG_IN_NONBLOCKING_CONNECT; \
+} else { \
+ (conn)->flags &= ~ NETCONN_FLAG_IN_NONBLOCKING_CONNECT; }} while(0)
+#define IN_NONBLOCKING_CONNECT(conn) (((conn)->flags & NETCONN_FLAG_IN_NONBLOCKING_CONNECT) != 0)
+
+/* forward declarations */
+#if LWIP_TCP
+static err_t do_writemore(struct netconn *conn);
+static void do_close_internal(struct netconn *conn);
+#endif
+
+#if LWIP_RAW
+/**
+ * Receive callback function for RAW netconns.
+ * Doesn't 'eat' the packet, only references it and sends it to
+ * conn->recvmbox
+ *
+ * @see raw.h (struct raw_pcb.recv) for parameters and return value
+ */
+static u8_t
+recv_raw(void *arg, struct raw_pcb *pcb, struct pbuf *p,
+ ip_addr_t *addr)
+{
+ struct pbuf *q;
+ struct netbuf *buf;
+ struct netconn *conn;
+
+ LWIP_UNUSED_ARG(addr);
+ conn = (struct netconn *)arg;
+
+ if ((conn != NULL) && sys_mbox_valid(&conn->recvmbox)) {
+#if LWIP_SO_RCVBUF
+ int recv_avail;
+ SYS_ARCH_GET(conn->recv_avail, recv_avail);
+ if ((recv_avail + (int)(p->tot_len)) > conn->recv_bufsize) {
+ return 0;
+ }
+#endif /* LWIP_SO_RCVBUF */
+ /* copy the whole packet into new pbufs */
+ q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
+ if(q != NULL) {
+ if (pbuf_copy(q, p) != ERR_OK) {
+ pbuf_free(q);
+ q = NULL;
+ }
+ }
+
+ if (q != NULL) {
+ u16_t len;
+ buf = (struct netbuf *)memp_malloc(MEMP_NETBUF);
+ if (buf == NULL) {
+ pbuf_free(q);
+ return 0;
+ }
+
+ buf->p = q;
+ buf->ptr = q;
+ ip_addr_copy(buf->addr, *ip_current_src_addr());
+ buf->port = pcb->protocol;
+
+ len = q->tot_len;
+ if (sys_mbox_trypost(&conn->recvmbox, buf) != ERR_OK) {
+ netbuf_delete(buf);
+ return 0;
+ } else {
+#if LWIP_SO_RCVBUF
+ SYS_ARCH_INC(conn->recv_avail, len);
+#endif /* LWIP_SO_RCVBUF */
+ /* Register event with callback */
+ API_EVENT(conn, NETCONN_EVT_RCVPLUS, len);
+ }
+ }
+ }
+
+ return 0; /* do not eat the packet */
+}
+#endif /* LWIP_RAW*/
+
+#if LWIP_UDP
+/**
+ * Receive callback function for UDP netconns.
+ * Posts the packet to conn->recvmbox or deletes it on memory error.
+ *
+ * @see udp.h (struct udp_pcb.recv) for parameters
+ */
+static void
+recv_udp(void *arg, struct udp_pcb *pcb, struct pbuf *p,
+ ip_addr_t *addr, u16_t port)
+{
+ struct netbuf *buf;
+ struct netconn *conn;
+ u16_t len;
+#if LWIP_SO_RCVBUF
+ int recv_avail;
+#endif /* LWIP_SO_RCVBUF */
+
+ LWIP_UNUSED_ARG(pcb); /* only used for asserts... */
+ LWIP_ASSERT("recv_udp must have a pcb argument", pcb != NULL);
+ LWIP_ASSERT("recv_udp must have an argument", arg != NULL);
+ conn = (struct netconn *)arg;
+ LWIP_ASSERT("recv_udp: recv for wrong pcb!", conn->pcb.udp == pcb);
+
+#if LWIP_SO_RCVBUF
+ SYS_ARCH_GET(conn->recv_avail, recv_avail);
+ if ((conn == NULL) || !sys_mbox_valid(&conn->recvmbox) ||
+ ((recv_avail + (int)(p->tot_len)) > conn->recv_bufsize)) {
+#else /* LWIP_SO_RCVBUF */
+ if ((conn == NULL) || !sys_mbox_valid(&conn->recvmbox)) {
+#endif /* LWIP_SO_RCVBUF */
+ pbuf_free(p);
+ return;
+ }
+
+ buf = (struct netbuf *)memp_malloc(MEMP_NETBUF);
+ if (buf == NULL) {
+ pbuf_free(p);
+ return;
+ } else {
+ buf->p = p;
+ buf->ptr = p;
+ ip_addr_set(&buf->addr, addr);
+ buf->port = port;
+#if LWIP_NETBUF_RECVINFO
+ {
+ const struct ip_hdr* iphdr = ip_current_header();
+ /* get the UDP header - always in the first pbuf, ensured by udp_input */
+ const struct udp_hdr* udphdr = (void*)(((char*)iphdr) + IPH_LEN(iphdr));
+#if LWIP_CHECKSUM_ON_COPY
+ buf->flags = NETBUF_FLAG_DESTADDR;
+#endif /* LWIP_CHECKSUM_ON_COPY */
+ ip_addr_set(&buf->toaddr, ip_current_dest_addr());
+ buf->toport_chksum = udphdr->dest;
+ }
+#endif /* LWIP_NETBUF_RECVINFO */
+ }
+
+ len = p->tot_len;
+ if (sys_mbox_trypost(&conn->recvmbox, buf) != ERR_OK) {
+ netbuf_delete(buf);
+ return;
+ } else {
+#if LWIP_SO_RCVBUF
+ SYS_ARCH_INC(conn->recv_avail, len);
+#endif /* LWIP_SO_RCVBUF */
+ /* Register event with callback */
+ API_EVENT(conn, NETCONN_EVT_RCVPLUS, len);
+ }
+}
+#endif /* LWIP_UDP */
+
+#if LWIP_TCP
+/**
+ * Receive callback function for TCP netconns.
+ * Posts the packet to conn->recvmbox, but doesn't delete it on errors.
+ *
+ * @see tcp.h (struct tcp_pcb.recv) for parameters and return value
+ */
+static err_t
+recv_tcp(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
+{
+ struct netconn *conn;
+ u16_t len;
+
+ LWIP_UNUSED_ARG(pcb);
+ LWIP_ASSERT("recv_tcp must have a pcb argument", pcb != NULL);
+ LWIP_ASSERT("recv_tcp must have an argument", arg != NULL);
+ conn = (struct netconn *)arg;
+ LWIP_ASSERT("recv_tcp: recv for wrong pcb!", conn->pcb.tcp == pcb);
+
+ if (conn == NULL) {
+ return ERR_VAL;
+ }
+ if (!sys_mbox_valid(&conn->recvmbox)) {
+ /* recvmbox already deleted */
+ if (p != NULL) {
+ tcp_recved(pcb, p->tot_len);
+ pbuf_free(p);
+ }
+ return ERR_OK;
+ }
+ /* Unlike for UDP or RAW pcbs, don't check for available space
+ using recv_avail since that could break the connection
+ (data is already ACKed) */
+
+ /* don't overwrite fatal errors! */
+ NETCONN_SET_SAFE_ERR(conn, err);
+
+ if (p != NULL) {
+ len = p->tot_len;
+ } else {
+ len = 0;
+ }
+
+ if (sys_mbox_trypost(&conn->recvmbox, p) != ERR_OK) {
+ /* don't deallocate p: it is presented to us later again from tcp_fasttmr! */
+ return ERR_MEM;
+ } else {
+#if LWIP_SO_RCVBUF
+ SYS_ARCH_INC(conn->recv_avail, len);
+#endif /* LWIP_SO_RCVBUF */
+ /* Register event with callback */
+ API_EVENT(conn, NETCONN_EVT_RCVPLUS, len);
+ }
+
+ return ERR_OK;
+}
+
+/**
+ * Poll callback function for TCP netconns.
+ * Wakes up an application thread that waits for a connection to close
+ * or data to be sent. The application thread then takes the
+ * appropriate action to go on.
+ *
+ * Signals the conn->sem.
+ * netconn_close waits for conn->sem if closing failed.
+ *
+ * @see tcp.h (struct tcp_pcb.poll) for parameters and return value
+ */
+static err_t
+poll_tcp(void *arg, struct tcp_pcb *pcb)
+{
+ struct netconn *conn = (struct netconn *)arg;
+
+ LWIP_UNUSED_ARG(pcb);
+ LWIP_ASSERT("conn != NULL", (conn != NULL));
+
+ if (conn->state == NETCONN_WRITE) {
+ do_writemore(conn);
+ } else if (conn->state == NETCONN_CLOSE) {
+ do_close_internal(conn);
+ }
+ /* @todo: implement connect timeout here? */
+
+ /* Did a nonblocking write fail before? Then check available write-space. */
+ if (conn->flags & NETCONN_FLAG_CHECK_WRITESPACE) {
+ /* If the queued byte- or pbuf-count drops below the configured low-water limit,
+ let select mark this pcb as writable again. */
+ if ((conn->pcb.tcp != NULL) && (tcp_sndbuf(conn->pcb.tcp) > TCP_SNDLOWAT) &&
+ (tcp_sndqueuelen(conn->pcb.tcp) < TCP_SNDQUEUELOWAT)) {
+ conn->flags &= ~NETCONN_FLAG_CHECK_WRITESPACE;
+ API_EVENT(conn, NETCONN_EVT_SENDPLUS, 0);
+ }
+ }
+
+ return ERR_OK;
+}
+
+/**
+ * Sent callback function for TCP netconns.
+ * Signals the conn->sem and calls API_EVENT.
+ * netconn_write waits for conn->sem if send buffer is low.
+ *
+ * @see tcp.h (struct tcp_pcb.sent) for parameters and return value
+ */
+static err_t
+sent_tcp(void *arg, struct tcp_pcb *pcb, u16_t len)
+{
+ struct netconn *conn = (struct netconn *)arg;
+
+ LWIP_UNUSED_ARG(pcb);
+ LWIP_ASSERT("conn != NULL", (conn != NULL));
+
+ if (conn->state == NETCONN_WRITE) {
+ do_writemore(conn);
+ } else if (conn->state == NETCONN_CLOSE) {
+ do_close_internal(conn);
+ }
+
+ if (conn) {
+ /* If the queued byte- or pbuf-count drops below the configured low-water limit,
+ let select mark this pcb as writable again. */
+ if ((conn->pcb.tcp != NULL) && (tcp_sndbuf(conn->pcb.tcp) > TCP_SNDLOWAT) &&
+ (tcp_sndqueuelen(conn->pcb.tcp) < TCP_SNDQUEUELOWAT)) {
+ conn->flags &= ~NETCONN_FLAG_CHECK_WRITESPACE;
+ API_EVENT(conn, NETCONN_EVT_SENDPLUS, len);
+ }
+ }
+
+ return ERR_OK;
+}
+
+/**
+ * Error callback function for TCP netconns.
+ * Signals conn->sem, posts to all conn mboxes and calls API_EVENT.
+ * The application thread has then to decide what to do.
+ *
+ * @see tcp.h (struct tcp_pcb.err) for parameters
+ */
+static void
+err_tcp(void *arg, err_t err)
+{
+ struct netconn *conn;
+ enum netconn_state old_state;
+ SYS_ARCH_DECL_PROTECT(lev);
+
+ conn = (struct netconn *)arg;
+ LWIP_ASSERT("conn != NULL", (conn != NULL));
+
+ conn->pcb.tcp = NULL;
+
+ /* no check since this is always fatal! */
+ SYS_ARCH_PROTECT(lev);
+ conn->last_err = err;
+ SYS_ARCH_UNPROTECT(lev);
+
+ /* reset conn->state now before waking up other threads */
+ old_state = conn->state;
+ conn->state = NETCONN_NONE;
+
+ /* Notify the user layer about a connection error. Used to signal
+ select. */
+ API_EVENT(conn, NETCONN_EVT_ERROR, 0);
+ /* Try to release selects pending on 'read' or 'write', too.
+ They will get an error if they actually try to read or write. */
+ API_EVENT(conn, NETCONN_EVT_RCVPLUS, 0);
+ API_EVENT(conn, NETCONN_EVT_SENDPLUS, 0);
+
+ /* pass NULL-message to recvmbox to wake up pending recv */
+ if (sys_mbox_valid(&conn->recvmbox)) {
+ /* use trypost to prevent deadlock */
+ sys_mbox_trypost(&conn->recvmbox, NULL);
+ }
+ /* pass NULL-message to acceptmbox to wake up pending accept */
+ if (sys_mbox_valid(&conn->acceptmbox)) {
+ /* use trypost to preven deadlock */
+ sys_mbox_trypost(&conn->acceptmbox, NULL);
+ }
+
+ if ((old_state == NETCONN_WRITE) || (old_state == NETCONN_CLOSE) ||
+ (old_state == NETCONN_CONNECT)) {
+ /* calling do_writemore/do_close_internal is not necessary
+ since the pcb has already been deleted! */
+ int was_nonblocking_connect = IN_NONBLOCKING_CONNECT(conn);
+ SET_NONBLOCKING_CONNECT(conn, 0);
+
+ if (!was_nonblocking_connect) {
+ /* set error return code */
+ LWIP_ASSERT("conn->current_msg != NULL", conn->current_msg != NULL);
+ conn->current_msg->err = err;
+ conn->current_msg = NULL;
+ /* wake up the waiting task */
+ sys_sem_signal(&conn->op_completed);
+ }
+ } else {
+ LWIP_ASSERT("conn->current_msg == NULL", conn->current_msg == NULL);
+ }
+}
+
+/**
+ * Setup a tcp_pcb with the correct callback function pointers
+ * and their arguments.
+ *
+ * @param conn the TCP netconn to setup
+ */
+static void
+setup_tcp(struct netconn *conn)
+{
+ struct tcp_pcb *pcb;
+
+ pcb = conn->pcb.tcp;
+ tcp_arg(pcb, conn);
+ tcp_recv(pcb, recv_tcp);
+ tcp_sent(pcb, sent_tcp);
+ tcp_poll(pcb, poll_tcp, 4);
+ tcp_err(pcb, err_tcp);
+}
+
+/**
+ * Accept callback function for TCP netconns.
+ * Allocates a new netconn and posts that to conn->acceptmbox.
+ *
+ * @see tcp.h (struct tcp_pcb_listen.accept) for parameters and return value
+ */
+static err_t
+accept_function(void *arg, struct tcp_pcb *newpcb, err_t err)
+{
+ struct netconn *newconn;
+ struct netconn *conn = (struct netconn *)arg;
+
+ LWIP_DEBUGF(API_MSG_DEBUG, ("accept_function: newpcb->tate: %s\n", tcp_debug_state_str(newpcb->state)));
+
+ if (!sys_mbox_valid(&conn->acceptmbox)) {
+ LWIP_DEBUGF(API_MSG_DEBUG, ("accept_function: acceptmbox already deleted\n"));
+ return ERR_VAL;
+ }
+
+ /* We have to set the callback here even though
+ * the new socket is unknown. conn->socket is marked as -1. */
+ newconn = netconn_alloc(conn->type, conn->callback);
+ if (newconn == NULL) {
+ return ERR_MEM;
+ }
+ newconn->pcb.tcp = newpcb;
+ setup_tcp(newconn);
+ /* no protection: when creating the pcb, the netconn is not yet known
+ to the application thread */
+ newconn->last_err = err;
+
+ if (sys_mbox_trypost(&conn->acceptmbox, newconn) != ERR_OK) {
+ /* When returning != ERR_OK, the pcb is aborted in tcp_process(),
+ so do nothing here! */
+ newconn->pcb.tcp = NULL;
+ /* no need to drain since we know the recvmbox is empty. */
+ sys_mbox_free(&newconn->recvmbox);
+ sys_mbox_set_invalid(&newconn->recvmbox);
+ netconn_free(newconn);
+ return ERR_MEM;
+ } else {
+ /* Register event with callback */
+ API_EVENT(conn, NETCONN_EVT_RCVPLUS, 0);
+ }
+
+ return ERR_OK;
+}
+#endif /* LWIP_TCP */
+
+/**
+ * Create a new pcb of a specific type.
+ * Called from do_newconn().
+ *
+ * @param msg the api_msg_msg describing the connection type
+ * @return msg->conn->err, but the return value is currently ignored
+ */
+static void
+pcb_new(struct api_msg_msg *msg)
+{
+ LWIP_ASSERT("pcb_new: pcb already allocated", msg->conn->pcb.tcp == NULL);
+
+ /* Allocate a PCB for this connection */
+ switch(NETCONNTYPE_GROUP(msg->conn->type)) {
+#if LWIP_RAW
+ case NETCONN_RAW:
+ msg->conn->pcb.raw = raw_new(msg->msg.n.proto);
+ if(msg->conn->pcb.raw == NULL) {
+ msg->err = ERR_MEM;
+ break;
+ }
+ raw_recv(msg->conn->pcb.raw, recv_raw, msg->conn);
+ break;
+#endif /* LWIP_RAW */
+#if LWIP_UDP
+ case NETCONN_UDP:
+ msg->conn->pcb.udp = udp_new();
+ if(msg->conn->pcb.udp == NULL) {
+ msg->err = ERR_MEM;
+ break;
+ }
+#if LWIP_UDPLITE
+ if (msg->conn->type==NETCONN_UDPLITE) {
+ udp_setflags(msg->conn->pcb.udp, UDP_FLAGS_UDPLITE);
+ }
+#endif /* LWIP_UDPLITE */
+ if (msg->conn->type==NETCONN_UDPNOCHKSUM) {
+ udp_setflags(msg->conn->pcb.udp, UDP_FLAGS_NOCHKSUM);
+ }
+ udp_recv(msg->conn->pcb.udp, recv_udp, msg->conn);
+ break;
+#endif /* LWIP_UDP */
+#if LWIP_TCP
+ case NETCONN_TCP:
+ msg->conn->pcb.tcp = tcp_new();
+ if(msg->conn->pcb.tcp == NULL) {
+ msg->err = ERR_MEM;
+ break;
+ }
+ setup_tcp(msg->conn);
+ break;
+#endif /* LWIP_TCP */
+ default:
+ /* Unsupported netconn type, e.g. protocol disabled */
+ msg->err = ERR_VAL;
+ break;
+ }
+}
+
+/**
+ * Create a new pcb of a specific type inside a netconn.
+ * Called from netconn_new_with_proto_and_callback.
+ *
+ * @param msg the api_msg_msg describing the connection type
+ */
+void
+do_newconn(struct api_msg_msg *msg)
+{
+ msg->err = ERR_OK;
+ if(msg->conn->pcb.tcp == NULL) {
+ pcb_new(msg);
+ }
+ /* Else? This "new" connection already has a PCB allocated. */
+ /* Is this an error condition? Should it be deleted? */
+ /* We currently just are happy and return. */
+
+ TCPIP_APIMSG_ACK(msg);
+}
+
+/**
+ * Create a new netconn (of a specific type) that has a callback function.
+ * The corresponding pcb is NOT created!
+ *
+ * @param t the type of 'connection' to create (@see enum netconn_type)
+ * @param proto the IP protocol for RAW IP pcbs
+ * @param callback a function to call on status changes (RX available, TX'ed)
+ * @return a newly allocated struct netconn or
+ * NULL on memory error
+ */
+struct netconn*
+netconn_alloc(enum netconn_type t, netconn_callback callback)
+{
+ struct netconn *conn;
+ int size;
+
+ conn = (struct netconn *)memp_malloc(MEMP_NETCONN);
+ if (conn == NULL) {
+ return NULL;
+ }
+
+ conn->last_err = ERR_OK;
+ conn->type = t;
+ conn->pcb.tcp = NULL;
+
+#if (DEFAULT_RAW_RECVMBOX_SIZE == DEFAULT_UDP_RECVMBOX_SIZE) && \
+ (DEFAULT_RAW_RECVMBOX_SIZE == DEFAULT_TCP_RECVMBOX_SIZE)
+ size = DEFAULT_RAW_RECVMBOX_SIZE;
+#else
+ switch(NETCONNTYPE_GROUP(t)) {
+#if LWIP_RAW
+ case NETCONN_RAW:
+ size = DEFAULT_RAW_RECVMBOX_SIZE;
+ break;
+#endif /* LWIP_RAW */
+#if LWIP_UDP
+ case NETCONN_UDP:
+ size = DEFAULT_UDP_RECVMBOX_SIZE;
+ break;
+#endif /* LWIP_UDP */
+#if LWIP_TCP
+ case NETCONN_TCP:
+ size = DEFAULT_TCP_RECVMBOX_SIZE;
+ break;
+#endif /* LWIP_TCP */
+ default:
+ LWIP_ASSERT("netconn_alloc: undefined netconn_type", 0);
+ break;
+ }
+#endif
+
+ if (sys_sem_new(&conn->op_completed, 0) != ERR_OK) {
+ memp_free(MEMP_NETCONN, conn);
+ return NULL;
+ }
+ if (sys_mbox_new(&conn->recvmbox, size) != ERR_OK) {
+ sys_sem_free(&conn->op_completed);
+ memp_free(MEMP_NETCONN, conn);
+ return NULL;
+ }
+
+#if LWIP_TCP
+ sys_mbox_set_invalid(&conn->acceptmbox);
+#endif
+ conn->state = NETCONN_NONE;
+#if LWIP_SOCKET
+ /* initialize socket to -1 since 0 is a valid socket */
+ conn->socket = -1;
+#endif /* LWIP_SOCKET */
+ conn->callback = callback;
+#if LWIP_TCP
+ conn->current_msg = NULL;
+ conn->write_offset = 0;
+#endif /* LWIP_TCP */
+#if LWIP_SO_RCVTIMEO
+ conn->recv_timeout = 0;
+#endif /* LWIP_SO_RCVTIMEO */
+#if LWIP_SO_RCVBUF
+ conn->recv_bufsize = RECV_BUFSIZE_DEFAULT;
+ conn->recv_avail = 0;
+#endif /* LWIP_SO_RCVBUF */
+ conn->flags = 0;
+ return conn;
+}
+
+/**
+ * Delete a netconn and all its resources.
+ * The pcb is NOT freed (since we might not be in the right thread context do this).
+ *
+ * @param conn the netconn to free
+ */
+void
+netconn_free(struct netconn *conn)
+{
+ LWIP_ASSERT("PCB must be deallocated outside this function", conn->pcb.tcp == NULL);
+ LWIP_ASSERT("recvmbox must be deallocated before calling this function",
+ !sys_mbox_valid(&conn->recvmbox));
+#if LWIP_TCP
+ LWIP_ASSERT("acceptmbox must be deallocated before calling this function",
+ !sys_mbox_valid(&conn->acceptmbox));
+#endif /* LWIP_TCP */
+
+ sys_sem_free(&conn->op_completed);
+ sys_sem_set_invalid(&conn->op_completed);
+
+ memp_free(MEMP_NETCONN, conn);
+}
+
+/**
+ * Delete rcvmbox and acceptmbox of a netconn and free the left-over data in
+ * these mboxes
+ *
+ * @param conn the netconn to free
+ * @bytes_drained bytes drained from recvmbox
+ * @accepts_drained pending connections drained from acceptmbox
+ */
+static void
+netconn_drain(struct netconn *conn)
+{
+ void *mem;
+#if LWIP_TCP
+ struct pbuf *p;
+#endif /* LWIP_TCP */
+
+ /* This runs in tcpip_thread, so we don't need to lock against rx packets */
+
+ /* Delete and drain the recvmbox. */
+ if (sys_mbox_valid(&conn->recvmbox)) {
+ while (sys_mbox_tryfetch(&conn->recvmbox, &mem) != SYS_MBOX_EMPTY) {
+#if LWIP_TCP
+ if (conn->type == NETCONN_TCP) {
+ if(mem != NULL) {
+ p = (struct pbuf*)mem;
+ /* pcb might be set to NULL already by err_tcp() */
+ if (conn->pcb.tcp != NULL) {
+ tcp_recved(conn->pcb.tcp, p->tot_len);
+ }
+ pbuf_free(p);
+ }
+ } else
+#endif /* LWIP_TCP */
+ {
+ netbuf_delete((struct netbuf *)mem);
+ }
+ }
+ sys_mbox_free(&conn->recvmbox);
+ sys_mbox_set_invalid(&conn->recvmbox);
+ }
+
+ /* Delete and drain the acceptmbox. */
+#if LWIP_TCP
+ if (sys_mbox_valid(&conn->acceptmbox)) {
+ while (sys_mbox_tryfetch(&conn->acceptmbox, &mem) != SYS_MBOX_EMPTY) {
+ struct netconn *newconn = (struct netconn *)mem;
+ /* Only tcp pcbs have an acceptmbox, so no need to check conn->type */
+ /* pcb might be set to NULL already by err_tcp() */
+ if (conn->pcb.tcp != NULL) {
+ tcp_accepted(conn->pcb.tcp);
+ }
+ /* drain recvmbox */
+ netconn_drain(newconn);
+ if (newconn->pcb.tcp != NULL) {
+ tcp_abort(newconn->pcb.tcp);
+ newconn->pcb.tcp = NULL;
+ }
+ netconn_free(newconn);
+ }
+ sys_mbox_free(&conn->acceptmbox);
+ sys_mbox_set_invalid(&conn->acceptmbox);
+ }
+#endif /* LWIP_TCP */
+}
+
+#if LWIP_TCP
+/**
+ * Internal helper function to close a TCP netconn: since this sometimes
+ * doesn't work at the first attempt, this function is called from multiple
+ * places.
+ *
+ * @param conn the TCP netconn to close
+ */
+static void
+do_close_internal(struct netconn *conn)
+{
+ err_t err;
+ u8_t shut, shut_rx, shut_tx, close;
+
+ LWIP_ASSERT("invalid conn", (conn != NULL));
+ LWIP_ASSERT("this is for tcp netconns only", (conn->type == NETCONN_TCP));
+ LWIP_ASSERT("conn must be in state NETCONN_CLOSE", (conn->state == NETCONN_CLOSE));
+ LWIP_ASSERT("pcb already closed", (conn->pcb.tcp != NULL));
+ LWIP_ASSERT("conn->current_msg != NULL", conn->current_msg != NULL);
+
+ shut = conn->current_msg->msg.sd.shut;
+ shut_rx = shut & NETCONN_SHUT_RD;
+ shut_tx = shut & NETCONN_SHUT_WR;
+ /* shutting down both ends is the same as closing */
+ close = shut == NETCONN_SHUT_RDWR;
+
+ /* Set back some callback pointers */
+ if (close) {
+ tcp_arg(conn->pcb.tcp, NULL);
+ }
+ if (conn->pcb.tcp->state == LISTEN) {
+ tcp_accept(conn->pcb.tcp, NULL);
+ } else {
+ /* some callbacks have to be reset if tcp_close is not successful */
+ if (shut_rx) {
+ tcp_recv(conn->pcb.tcp, NULL);
+ tcp_accept(conn->pcb.tcp, NULL);
+ }
+ if (shut_tx) {
+ tcp_sent(conn->pcb.tcp, NULL);
+ }
+ if (close) {
+ tcp_poll(conn->pcb.tcp, NULL, 4);
+ tcp_err(conn->pcb.tcp, NULL);
+ }
+ }
+ /* Try to close the connection */
+ if (shut == NETCONN_SHUT_RDWR) {
+ err = tcp_close(conn->pcb.tcp);
+ } else {
+ err = tcp_shutdown(conn->pcb.tcp, shut & NETCONN_SHUT_RD, shut & NETCONN_SHUT_WR);
+ }
+ if (err == ERR_OK) {
+ /* Closing succeeded */
+ conn->current_msg->err = ERR_OK;
+ conn->current_msg = NULL;
+ conn->state = NETCONN_NONE;
+ /* Set back some callback pointers as conn is going away */
+ conn->pcb.tcp = NULL;
+ /* Trigger select() in socket layer. Make sure everybody notices activity
+ on the connection, error first! */
+ if (close) {
+ API_EVENT(conn, NETCONN_EVT_ERROR, 0);
+ }
+ if (shut_rx) {
+ API_EVENT(conn, NETCONN_EVT_RCVPLUS, 0);
+ }
+ if (shut_tx) {
+ API_EVENT(conn, NETCONN_EVT_SENDPLUS, 0);
+ }
+ /* wake up the application task */
+ sys_sem_signal(&conn->op_completed);
+ } else {
+ /* Closing failed, restore some of the callbacks */
+ /* Closing of listen pcb will never fail! */
+ LWIP_ASSERT("Closing a listen pcb may not fail!", (conn->pcb.tcp->state != LISTEN));
+ tcp_sent(conn->pcb.tcp, sent_tcp);
+ tcp_poll(conn->pcb.tcp, poll_tcp, 4);
+ tcp_err(conn->pcb.tcp, err_tcp);
+ tcp_arg(conn->pcb.tcp, conn);
+ /* don't restore recv callback: we don't want to receive any more data */
+ }
+ /* If closing didn't succeed, we get called again either
+ from poll_tcp or from sent_tcp */
+}
+#endif /* LWIP_TCP */
+
+/**
+ * Delete the pcb inside a netconn.
+ * Called from netconn_delete.
+ *
+ * @param msg the api_msg_msg pointing to the connection
+ */
+void
+do_delconn(struct api_msg_msg *msg)
+{
+ /* @todo TCP: abort running write/connect? */
+ if ((msg->conn->state != NETCONN_NONE) &&
+ (msg->conn->state != NETCONN_LISTEN) &&
+ (msg->conn->state != NETCONN_CONNECT)) {
+ /* this only happens for TCP netconns */
+ LWIP_ASSERT("msg->conn->type == NETCONN_TCP", msg->conn->type == NETCONN_TCP);
+ msg->err = ERR_INPROGRESS;
+ } else {
+ LWIP_ASSERT("blocking connect in progress",
+ (msg->conn->state != NETCONN_CONNECT) || IN_NONBLOCKING_CONNECT(msg->conn));
+ /* Drain and delete mboxes */
+ netconn_drain(msg->conn);
+
+ if (msg->conn->pcb.tcp != NULL) {
+
+ switch (NETCONNTYPE_GROUP(msg->conn->type)) {
+#if LWIP_RAW
+ case NETCONN_RAW:
+ raw_remove(msg->conn->pcb.raw);
+ break;
+#endif /* LWIP_RAW */
+#if LWIP_UDP
+ case NETCONN_UDP:
+ msg->conn->pcb.udp->recv_arg = NULL;
+ udp_remove(msg->conn->pcb.udp);
+ break;
+#endif /* LWIP_UDP */
+#if LWIP_TCP
+ case NETCONN_TCP:
+ LWIP_ASSERT("already writing or closing", msg->conn->current_msg == NULL &&
+ msg->conn->write_offset == 0);
+ msg->conn->state = NETCONN_CLOSE;
+ msg->msg.sd.shut = NETCONN_SHUT_RDWR;
+ msg->conn->current_msg = msg;
+ do_close_internal(msg->conn);
+ /* API_EVENT is called inside do_close_internal, before releasing
+ the application thread, so we can return at this point! */
+ return;
+#endif /* LWIP_TCP */
+ default:
+ break;
+ }
+ msg->conn->pcb.tcp = NULL;
+ }
+ /* tcp netconns don't come here! */
+
+ /* @todo: this lets select make the socket readable and writable,
+ which is wrong! errfd instead? */
+ API_EVENT(msg->conn, NETCONN_EVT_RCVPLUS, 0);
+ API_EVENT(msg->conn, NETCONN_EVT_SENDPLUS, 0);
+ }
+ if (sys_sem_valid(&msg->conn->op_completed)) {
+ sys_sem_signal(&msg->conn->op_completed);
+ }
+}
+
+/**
+ * Bind a pcb contained in a netconn
+ * Called from netconn_bind.
+ *
+ * @param msg the api_msg_msg pointing to the connection and containing
+ * the IP address and port to bind to
+ */
+void
+do_bind(struct api_msg_msg *msg)
+{
+ if (ERR_IS_FATAL(msg->conn->last_err)) {
+ msg->err = msg->conn->last_err;
+ } else {
+ msg->err = ERR_VAL;
+ if (msg->conn->pcb.tcp != NULL) {
+ switch (NETCONNTYPE_GROUP(msg->conn->type)) {
+#if LWIP_RAW
+ case NETCONN_RAW:
+ msg->err = raw_bind(msg->conn->pcb.raw, msg->msg.bc.ipaddr);
+ break;
+#endif /* LWIP_RAW */
+#if LWIP_UDP
+ case NETCONN_UDP:
+ msg->err = udp_bind(msg->conn->pcb.udp, msg->msg.bc.ipaddr, msg->msg.bc.port);
+ break;
+#endif /* LWIP_UDP */
+#if LWIP_TCP
+ case NETCONN_TCP:
+ msg->err = tcp_bind(msg->conn->pcb.tcp, msg->msg.bc.ipaddr, msg->msg.bc.port);
+ break;
+#endif /* LWIP_TCP */
+ default:
+ break;
+ }
+ }
+ }
+ TCPIP_APIMSG_ACK(msg);
+}
+
+#if LWIP_TCP
+/**
+ * TCP callback function if a connection (opened by tcp_connect/do_connect) has
+ * been established (or reset by the remote host).
+ *
+ * @see tcp.h (struct tcp_pcb.connected) for parameters and return values
+ */
+static err_t
+do_connected(void *arg, struct tcp_pcb *pcb, err_t err)
+{
+ struct netconn *conn;
+ int was_blocking;
+
+ LWIP_UNUSED_ARG(pcb);
+
+ conn = (struct netconn *)arg;
+
+ if (conn == NULL) {
+ return ERR_VAL;
+ }
+
+ LWIP_ASSERT("conn->state == NETCONN_CONNECT", conn->state == NETCONN_CONNECT);
+ LWIP_ASSERT("(conn->current_msg != NULL) || conn->in_non_blocking_connect",
+ (conn->current_msg != NULL) || IN_NONBLOCKING_CONNECT(conn));
+
+ if (conn->current_msg != NULL) {
+ conn->current_msg->err = err;
+ }
+ if ((conn->type == NETCONN_TCP) && (err == ERR_OK)) {
+ setup_tcp(conn);
+ }
+ was_blocking = !IN_NONBLOCKING_CONNECT(conn);
+ SET_NONBLOCKING_CONNECT(conn, 0);
+ conn->current_msg = NULL;
+ conn->state = NETCONN_NONE;
+ if (!was_blocking) {
+ NETCONN_SET_SAFE_ERR(conn, ERR_OK);
+ }
+ API_EVENT(conn, NETCONN_EVT_SENDPLUS, 0);
+
+ if (was_blocking) {
+ sys_sem_signal(&conn->op_completed);
+ }
+ return ERR_OK;
+}
+#endif /* LWIP_TCP */
+
+/**
+ * Connect a pcb contained inside a netconn
+ * Called from netconn_connect.
+ *
+ * @param msg the api_msg_msg pointing to the connection and containing
+ * the IP address and port to connect to
+ */
+void
+do_connect(struct api_msg_msg *msg)
+{
+ if (msg->conn->pcb.tcp == NULL) {
+ /* This may happen when calling netconn_connect() a second time */
+ msg->err = ERR_CLSD;
+ } else {
+ switch (NETCONNTYPE_GROUP(msg->conn->type)) {
+#if LWIP_RAW
+ case NETCONN_RAW:
+ msg->err = raw_connect(msg->conn->pcb.raw, msg->msg.bc.ipaddr);
+ break;
+#endif /* LWIP_RAW */
+#if LWIP_UDP
+ case NETCONN_UDP:
+ msg->err = udp_connect(msg->conn->pcb.udp, msg->msg.bc.ipaddr, msg->msg.bc.port);
+ break;
+#endif /* LWIP_UDP */
+#if LWIP_TCP
+ case NETCONN_TCP:
+ /* Prevent connect while doing any other action. */
+ if (msg->conn->state != NETCONN_NONE) {
+ msg->err = ERR_ISCONN;
+ } else {
+ setup_tcp(msg->conn);
+ msg->err = tcp_connect(msg->conn->pcb.tcp, msg->msg.bc.ipaddr,
+ msg->msg.bc.port, do_connected);
+ if (msg->err == ERR_OK) {
+ u8_t non_blocking = netconn_is_nonblocking(msg->conn);
+ msg->conn->state = NETCONN_CONNECT;
+ SET_NONBLOCKING_CONNECT(msg->conn, non_blocking);
+ if (non_blocking) {
+ msg->err = ERR_INPROGRESS;
+ } else {
+ msg->conn->current_msg = msg;
+ /* sys_sem_signal() is called from do_connected (or err_tcp()),
+ * when the connection is established! */
+ return;
+ }
+ }
+ }
+ break;
+#endif /* LWIP_TCP */
+ default:
+ LWIP_ERROR("Invalid netconn type", 0, do{ msg->err = ERR_VAL; }while(0));
+ break;
+ }
+ }
+ sys_sem_signal(&msg->conn->op_completed);
+}
+
+/**
+ * Connect a pcb contained inside a netconn
+ * Only used for UDP netconns.
+ * Called from netconn_disconnect.
+ *
+ * @param msg the api_msg_msg pointing to the connection to disconnect
+ */
+void
+do_disconnect(struct api_msg_msg *msg)
+{
+#if LWIP_UDP
+ if (NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_UDP) {
+ udp_disconnect(msg->conn->pcb.udp);
+ msg->err = ERR_OK;
+ } else
+#endif /* LWIP_UDP */
+ {
+ msg->err = ERR_VAL;
+ }
+ TCPIP_APIMSG_ACK(msg);
+}
+
+#if LWIP_TCP
+/**
+ * Set a TCP pcb contained in a netconn into listen mode
+ * Called from netconn_listen.
+ *
+ * @param msg the api_msg_msg pointing to the connection
+ */
+void
+do_listen(struct api_msg_msg *msg)
+{
+ if (ERR_IS_FATAL(msg->conn->last_err)) {
+ msg->err = msg->conn->last_err;
+ } else {
+ msg->err = ERR_CONN;
+ if (msg->conn->pcb.tcp != NULL) {
+ if (msg->conn->type == NETCONN_TCP) {
+ if (msg->conn->state == NETCONN_NONE) {
+#if TCP_LISTEN_BACKLOG
+ struct tcp_pcb* lpcb = tcp_listen_with_backlog(msg->conn->pcb.tcp, msg->msg.lb.backlog);
+#else /* TCP_LISTEN_BACKLOG */
+ struct tcp_pcb* lpcb = tcp_listen(msg->conn->pcb.tcp);
+#endif /* TCP_LISTEN_BACKLOG */
+ if (lpcb == NULL) {
+ /* in this case, the old pcb is still allocated */
+ msg->err = ERR_MEM;
+ } else {
+ /* delete the recvmbox and allocate the acceptmbox */
+ if (sys_mbox_valid(&msg->conn->recvmbox)) {
+ /** @todo: should we drain the recvmbox here? */
+ sys_mbox_free(&msg->conn->recvmbox);
+ sys_mbox_set_invalid(&msg->conn->recvmbox);
+ }
+ msg->err = ERR_OK;
+ if (!sys_mbox_valid(&msg->conn->acceptmbox)) {
+ msg->err = sys_mbox_new(&msg->conn->acceptmbox, DEFAULT_ACCEPTMBOX_SIZE);
+ }
+ if (msg->err == ERR_OK) {
+ msg->conn->state = NETCONN_LISTEN;
+ msg->conn->pcb.tcp = lpcb;
+ tcp_arg(msg->conn->pcb.tcp, msg->conn);
+ tcp_accept(msg->conn->pcb.tcp, accept_function);
+ } else {
+ /* since the old pcb is already deallocated, free lpcb now */
+ tcp_close(lpcb);
+ msg->conn->pcb.tcp = NULL;
+ }
+ }
+ }
+ }
+ }
+ }
+ TCPIP_APIMSG_ACK(msg);
+}
+#endif /* LWIP_TCP */
+
+/**
+ * Send some data on a RAW or UDP pcb contained in a netconn
+ * Called from netconn_send
+ *
+ * @param msg the api_msg_msg pointing to the connection
+ */
+void
+do_send(struct api_msg_msg *msg)
+{
+ if (ERR_IS_FATAL(msg->conn->last_err)) {
+ msg->err = msg->conn->last_err;
+ } else {
+ msg->err = ERR_CONN;
+ if (msg->conn->pcb.tcp != NULL) {
+ switch (NETCONNTYPE_GROUP(msg->conn->type)) {
+#if LWIP_RAW
+ case NETCONN_RAW:
+ if (ip_addr_isany(&msg->msg.b->addr)) {
+ msg->err = raw_send(msg->conn->pcb.raw, msg->msg.b->p);
+ } else {
+ msg->err = raw_sendto(msg->conn->pcb.raw, msg->msg.b->p, &msg->msg.b->addr);
+ }
+ break;
+#endif
+#if LWIP_UDP
+ case NETCONN_UDP:
+#if LWIP_CHECKSUM_ON_COPY
+ if (ip_addr_isany(&msg->msg.b->addr)) {
+ msg->err = udp_send_chksum(msg->conn->pcb.udp, msg->msg.b->p,
+ msg->msg.b->flags & NETBUF_FLAG_CHKSUM, msg->msg.b->toport_chksum);
+ } else {
+ msg->err = udp_sendto_chksum(msg->conn->pcb.udp, msg->msg.b->p,
+ &msg->msg.b->addr, msg->msg.b->port,
+ msg->msg.b->flags & NETBUF_FLAG_CHKSUM, msg->msg.b->toport_chksum);
+ }
+#else /* LWIP_CHECKSUM_ON_COPY */
+ if (ip_addr_isany(&msg->msg.b->addr)) {
+ msg->err = udp_send(msg->conn->pcb.udp, msg->msg.b->p);
+ } else {
+ msg->err = udp_sendto(msg->conn->pcb.udp, msg->msg.b->p, &msg->msg.b->addr, msg->msg.b->port);
+ }
+#endif /* LWIP_CHECKSUM_ON_COPY */
+ break;
+#endif /* LWIP_UDP */
+ default:
+ break;
+ }
+ }
+ }
+ TCPIP_APIMSG_ACK(msg);
+}
+
+#if LWIP_TCP
+/**
+ * Indicate data has been received from a TCP pcb contained in a netconn
+ * Called from netconn_recv
+ *
+ * @param msg the api_msg_msg pointing to the connection
+ */
+void
+do_recv(struct api_msg_msg *msg)
+{
+ msg->err = ERR_OK;
+ if (msg->conn->pcb.tcp != NULL) {
+ if (msg->conn->type == NETCONN_TCP) {
+#if TCP_LISTEN_BACKLOG
+ if (msg->conn->pcb.tcp->state == LISTEN) {
+ tcp_accepted(msg->conn->pcb.tcp);
+ } else
+#endif /* TCP_LISTEN_BACKLOG */
+ {
+ u32_t remaining = msg->msg.r.len;
+ do {
+ u16_t recved = (remaining > 0xffff) ? 0xffff : (u16_t)remaining;
+ tcp_recved(msg->conn->pcb.tcp, recved);
+ remaining -= recved;
+ }while(remaining != 0);
+ }
+ }
+ }
+ TCPIP_APIMSG_ACK(msg);
+}
+
+/**
+ * See if more data needs to be written from a previous call to netconn_write.
+ * Called initially from do_write. If the first call can't send all data
+ * (because of low memory or empty send-buffer), this function is called again
+ * from sent_tcp() or poll_tcp() to send more data. If all data is sent, the
+ * blocking application thread (waiting in netconn_write) is released.
+ *
+ * @param conn netconn (that is currently in state NETCONN_WRITE) to process
+ * @return ERR_OK
+ * ERR_MEM if LWIP_TCPIP_CORE_LOCKING=1 and sending hasn't yet finished
+ */
+static err_t
+do_writemore(struct netconn *conn)
+{
+ err_t err = ERR_OK;
+ void *dataptr;
+ u16_t len, available;
+ u8_t write_finished = 0;
+ size_t diff;
+ u8_t dontblock = netconn_is_nonblocking(conn) ||
+ (conn->current_msg->msg.w.apiflags & NETCONN_DONTBLOCK);
+ u8_t apiflags = conn->current_msg->msg.w.apiflags;
+
+ LWIP_ASSERT("conn != NULL", conn != NULL);
+ LWIP_ASSERT("conn->state == NETCONN_WRITE", (conn->state == NETCONN_WRITE));
+ LWIP_ASSERT("conn->current_msg != NULL", conn->current_msg != NULL);
+ LWIP_ASSERT("conn->pcb.tcp != NULL", conn->pcb.tcp != NULL);
+ LWIP_ASSERT("conn->write_offset < conn->current_msg->msg.w.len",
+ conn->write_offset < conn->current_msg->msg.w.len);
+
+ dataptr = (u8_t*)conn->current_msg->msg.w.dataptr + conn->write_offset;
+ diff = conn->current_msg->msg.w.len - conn->write_offset;
+ if (diff > 0xffffUL) { /* max_u16_t */
+ len = 0xffff;
+#if LWIP_TCPIP_CORE_LOCKING
+ conn->flags |= NETCONN_FLAG_WRITE_DELAYED;
+#endif
+ apiflags |= TCP_WRITE_FLAG_MORE;
+ } else {
+ len = (u16_t)diff;
+ }
+ available = tcp_sndbuf(conn->pcb.tcp);
+ if (available < len) {
+ /* don't try to write more than sendbuf */
+ len = available;
+#if LWIP_TCPIP_CORE_LOCKING
+ conn->flags |= NETCONN_FLAG_WRITE_DELAYED;
+#endif
+ apiflags |= TCP_WRITE_FLAG_MORE;
+ }
+ if (dontblock && (len < conn->current_msg->msg.w.len)) {
+ /* failed to send all data at once -> nonblocking write not possible */
+ err = ERR_MEM;
+ }
+ if (err == ERR_OK) {
+ LWIP_ASSERT("do_writemore: invalid length!", ((conn->write_offset + len) <= conn->current_msg->msg.w.len));
+ err = tcp_write(conn->pcb.tcp, dataptr, len, apiflags);
+ }
+ if (dontblock && (err == ERR_MEM)) {
+ /* nonblocking write failed */
+ write_finished = 1;
+ err = ERR_WOULDBLOCK;
+ /* let poll_tcp check writable space to mark the pcb
+ writable again */
+ conn->flags |= NETCONN_FLAG_CHECK_WRITESPACE;
+ /* let select mark this pcb as non-writable. */
+ API_EVENT(conn, NETCONN_EVT_SENDMINUS, len);
+ } else {
+ /* if OK or memory error, check available space */
+ if (((err == ERR_OK) || (err == ERR_MEM)) &&
+ ((tcp_sndbuf(conn->pcb.tcp) <= TCP_SNDLOWAT) ||
+ (tcp_sndqueuelen(conn->pcb.tcp) >= TCP_SNDQUEUELOWAT))) {
+ /* The queued byte- or pbuf-count exceeds the configured low-water limit,
+ let select mark this pcb as non-writable. */
+ API_EVENT(conn, NETCONN_EVT_SENDMINUS, len);
+ }
+
+ if (err == ERR_OK) {
+ conn->write_offset += len;
+ if (conn->write_offset == conn->current_msg->msg.w.len) {
+ /* everything was written */
+ write_finished = 1;
+ conn->write_offset = 0;
+ }
+ tcp_output(conn->pcb.tcp);
+ } else if (err == ERR_MEM) {
+ /* If ERR_MEM, we wait for sent_tcp or poll_tcp to be called
+ we do NOT return to the application thread, since ERR_MEM is
+ only a temporary error! */
+
+ /* tcp_write returned ERR_MEM, try tcp_output anyway */
+ tcp_output(conn->pcb.tcp);
+
+ #if LWIP_TCPIP_CORE_LOCKING
+ conn->flags |= NETCONN_FLAG_WRITE_DELAYED;
+ #endif
+ } else {
+ /* On errors != ERR_MEM, we don't try writing any more but return
+ the error to the application thread. */
+ write_finished = 1;
+ }
+ }
+
+ if (write_finished) {
+ /* everything was written: set back connection state
+ and back to application task */
+ conn->current_msg->err = err;
+ conn->current_msg = NULL;
+ conn->state = NETCONN_NONE;
+#if LWIP_TCPIP_CORE_LOCKING
+ if ((conn->flags & NETCONN_FLAG_WRITE_DELAYED) != 0)
+#endif
+ {
+ sys_sem_signal(&conn->op_completed);
+ }
+ }
+#if LWIP_TCPIP_CORE_LOCKING
+ else
+ return ERR_MEM;
+#endif
+ return ERR_OK;
+}
+#endif /* LWIP_TCP */
+
+/**
+ * Send some data on a TCP pcb contained in a netconn
+ * Called from netconn_write
+ *
+ * @param msg the api_msg_msg pointing to the connection
+ */
+void
+do_write(struct api_msg_msg *msg)
+{
+ if (ERR_IS_FATAL(msg->conn->last_err)) {
+ msg->err = msg->conn->last_err;
+ } else {
+ if (msg->conn->type == NETCONN_TCP) {
+#if LWIP_TCP
+ if (msg->conn->state != NETCONN_NONE) {
+ /* netconn is connecting, closing or in blocking write */
+ msg->err = ERR_INPROGRESS;
+ } else if (msg->conn->pcb.tcp != NULL) {
+ msg->conn->state = NETCONN_WRITE;
+ /* set all the variables used by do_writemore */
+ LWIP_ASSERT("already writing or closing", msg->conn->current_msg == NULL &&
+ msg->conn->write_offset == 0);
+ LWIP_ASSERT("msg->msg.w.len != 0", msg->msg.w.len != 0);
+ msg->conn->current_msg = msg;
+ msg->conn->write_offset = 0;
+#if LWIP_TCPIP_CORE_LOCKING
+ msg->conn->flags &= ~NETCONN_FLAG_WRITE_DELAYED;
+ if (do_writemore(msg->conn) != ERR_OK) {
+ LWIP_ASSERT("state!", msg->conn->state == NETCONN_WRITE);
+ UNLOCK_TCPIP_CORE();
+ sys_arch_sem_wait(&msg->conn->op_completed, 0);
+ LOCK_TCPIP_CORE();
+ LWIP_ASSERT("state!", msg->conn->state == NETCONN_NONE);
+ }
+#else /* LWIP_TCPIP_CORE_LOCKING */
+ do_writemore(msg->conn);
+#endif /* LWIP_TCPIP_CORE_LOCKING */
+ /* for both cases: if do_writemore was called, don't ACK the APIMSG
+ since do_writemore ACKs it! */
+ return;
+ } else {
+ msg->err = ERR_CONN;
+ }
+#else /* LWIP_TCP */
+ msg->err = ERR_VAL;
+#endif /* LWIP_TCP */
+#if (LWIP_UDP || LWIP_RAW)
+ } else {
+ msg->err = ERR_VAL;
+#endif /* (LWIP_UDP || LWIP_RAW) */
+ }
+ }
+ TCPIP_APIMSG_ACK(msg);
+}
+
+/**
+ * Return a connection's local or remote address
+ * Called from netconn_getaddr
+ *
+ * @param msg the api_msg_msg pointing to the connection
+ */
+void
+do_getaddr(struct api_msg_msg *msg)
+{
+ if (msg->conn->pcb.ip != NULL) {
+ *(msg->msg.ad.ipaddr) = (msg->msg.ad.local ? msg->conn->pcb.ip->local_ip :
+ msg->conn->pcb.ip->remote_ip);
+
+ msg->err = ERR_OK;
+ switch (NETCONNTYPE_GROUP(msg->conn->type)) {
+#if LWIP_RAW
+ case NETCONN_RAW:
+ if (msg->msg.ad.local) {
+ *(msg->msg.ad.port) = msg->conn->pcb.raw->protocol;
+ } else {
+ /* return an error as connecting is only a helper for upper layers */
+ msg->err = ERR_CONN;
+ }
+ break;
+#endif /* LWIP_RAW */
+#if LWIP_UDP
+ case NETCONN_UDP:
+ if (msg->msg.ad.local) {
+ *(msg->msg.ad.port) = msg->conn->pcb.udp->local_port;
+ } else {
+ if ((msg->conn->pcb.udp->flags & UDP_FLAGS_CONNECTED) == 0) {
+ msg->err = ERR_CONN;
+ } else {
+ *(msg->msg.ad.port) = msg->conn->pcb.udp->remote_port;
+ }
+ }
+ break;
+#endif /* LWIP_UDP */
+#if LWIP_TCP
+ case NETCONN_TCP:
+ *(msg->msg.ad.port) = (msg->msg.ad.local?msg->conn->pcb.tcp->local_port:msg->conn->pcb.tcp->remote_port);
+ break;
+#endif /* LWIP_TCP */
+ default:
+ LWIP_ASSERT("invalid netconn_type", 0);
+ break;
+ }
+ } else {
+ msg->err = ERR_CONN;
+ }
+ TCPIP_APIMSG_ACK(msg);
+}
+
+/**
+ * Close a TCP pcb contained in a netconn
+ * Called from netconn_close
+ *
+ * @param msg the api_msg_msg pointing to the connection
+ */
+void
+do_close(struct api_msg_msg *msg)
+{
+#if LWIP_TCP
+ /* @todo: abort running write/connect? */
+ if ((msg->conn->state != NETCONN_NONE) && (msg->conn->state != NETCONN_LISTEN)) {
+ /* this only happens for TCP netconns */
+ LWIP_ASSERT("msg->conn->type == NETCONN_TCP", msg->conn->type == NETCONN_TCP);
+ msg->err = ERR_INPROGRESS;
+ } else if ((msg->conn->pcb.tcp != NULL) && (msg->conn->type == NETCONN_TCP)) {
+ if ((msg->msg.sd.shut != NETCONN_SHUT_RDWR) && (msg->conn->state == NETCONN_LISTEN)) {
+ /* LISTEN doesn't support half shutdown */
+ msg->err = ERR_CONN;
+ } else {
+ if (msg->msg.sd.shut & NETCONN_SHUT_RD) {
+ /* Drain and delete mboxes */
+ netconn_drain(msg->conn);
+ }
+ LWIP_ASSERT("already writing or closing", msg->conn->current_msg == NULL &&
+ msg->conn->write_offset == 0);
+ msg->conn->state = NETCONN_CLOSE;
+ msg->conn->current_msg = msg;
+ do_close_internal(msg->conn);
+ /* for tcp netconns, do_close_internal ACKs the message */
+ return;
+ }
+ } else
+#endif /* LWIP_TCP */
+ {
+ msg->err = ERR_VAL;
+ }
+ sys_sem_signal(&msg->conn->op_completed);
+}
+
+#if LWIP_IGMP
+/**
+ * Join multicast groups for UDP netconns.
+ * Called from netconn_join_leave_group
+ *
+ * @param msg the api_msg_msg pointing to the connection
+ */
+void
+do_join_leave_group(struct api_msg_msg *msg)
+{
+ if (ERR_IS_FATAL(msg->conn->last_err)) {
+ msg->err = msg->conn->last_err;
+ } else {
+ if (msg->conn->pcb.tcp != NULL) {
+ if (NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_UDP) {
+#if LWIP_UDP
+ if (msg->msg.jl.join_or_leave == NETCONN_JOIN) {
+ msg->err = igmp_joingroup(msg->msg.jl.netif_addr, msg->msg.jl.multiaddr);
+ } else {
+ msg->err = igmp_leavegroup(msg->msg.jl.netif_addr, msg->msg.jl.multiaddr);
+ }
+#endif /* LWIP_UDP */
+#if (LWIP_TCP || LWIP_RAW)
+ } else {
+ msg->err = ERR_VAL;
+#endif /* (LWIP_TCP || LWIP_RAW) */
+ }
+ } else {
+ msg->err = ERR_CONN;
+ }
+ }
+ TCPIP_APIMSG_ACK(msg);
+}
+#endif /* LWIP_IGMP */
+
+#if LWIP_DNS
+/**
+ * Callback function that is called when DNS name is resolved
+ * (or on timeout). A waiting application thread is waked up by
+ * signaling the semaphore.
+ */
+static void
+do_dns_found(const char *name, ip_addr_t *ipaddr, void *arg)
+{
+ struct dns_api_msg *msg = (struct dns_api_msg*)arg;
+
+ LWIP_ASSERT("DNS response for wrong host name", strcmp(msg->name, name) == 0);
+ LWIP_UNUSED_ARG(name);
+
+ if (ipaddr == NULL) {
+ /* timeout or memory error */
+ *msg->err = ERR_VAL;
+ } else {
+ /* address was resolved */
+ *msg->err = ERR_OK;
+ *msg->addr = *ipaddr;
+ }
+ /* wake up the application task waiting in netconn_gethostbyname */
+ sys_sem_signal(msg->sem);
+}
+
+/**
+ * Execute a DNS query
+ * Called from netconn_gethostbyname
+ *
+ * @param arg the dns_api_msg pointing to the query
+ */
+void
+do_gethostbyname(void *arg)
+{
+ struct dns_api_msg *msg = (struct dns_api_msg*)arg;
+
+ *msg->err = dns_gethostbyname(msg->name, msg->addr, do_dns_found, msg);
+ if (*msg->err != ERR_INPROGRESS) {
+ /* on error or immediate success, wake up the application
+ * task waiting in netconn_gethostbyname */
+ sys_sem_signal(msg->sem);
+ }
+}
+#endif /* LWIP_DNS */
+
+#endif /* LWIP_NETCONN */
--- /dev/null
+/**
+ * @file
+ * Error Management module
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/err.h"
+
+#ifdef LWIP_DEBUG
+
+static const char *err_strerr[] = {
+ "Ok.", /* ERR_OK 0 */
+ "Out of memory error.", /* ERR_MEM -1 */
+ "Buffer error.", /* ERR_BUF -2 */
+ "Timeout.", /* ERR_TIMEOUT -3 */
+ "Routing problem.", /* ERR_RTE -4 */
+ "Operation in progress.", /* ERR_INPROGRESS -5 */
+ "Illegal value.", /* ERR_VAL -6 */
+ "Operation would block.", /* ERR_WOULDBLOCK -7 */
+ "Address in use.", /* ERR_USE -8 */
+ "Already connected.", /* ERR_ISCONN -9 */
+ "Connection aborted.", /* ERR_ABRT -10 */
+ "Connection reset.", /* ERR_RST -11 */
+ "Connection closed.", /* ERR_CLSD -12 */
+ "Not connected.", /* ERR_CONN -13 */
+ "Illegal argument.", /* ERR_ARG -14 */
+ "Low-level netif error.", /* ERR_IF -15 */
+};
+
+/**
+ * Convert an lwip internal error to a string representation.
+ *
+ * @param err an lwip internal err_t
+ * @return a string representation for err
+ */
+const char *
+lwip_strerr(err_t err)
+{
+ return err_strerr[-err];
+
+}
+
+#endif /* LWIP_DEBUG */
--- /dev/null
+/**
+ * @file
+ * Network buffer management
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_NETCONN /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/netbuf.h"
+#include "lwip/memp.h"
+
+#include <string.h>
+
+/**
+ * Create (allocate) and initialize a new netbuf.
+ * The netbuf doesn't yet contain a packet buffer!
+ *
+ * @return a pointer to a new netbuf
+ * NULL on lack of memory
+ */
+struct
+netbuf *netbuf_new(void)
+{
+ struct netbuf *buf;
+
+ buf = (struct netbuf *)memp_malloc(MEMP_NETBUF);
+ if (buf != NULL) {
+ buf->p = NULL;
+ buf->ptr = NULL;
+ ip_addr_set_any(&buf->addr);
+ buf->port = 0;
+#if LWIP_NETBUF_RECVINFO || LWIP_CHECKSUM_ON_COPY
+#if LWIP_CHECKSUM_ON_COPY
+ buf->flags = 0;
+#endif /* LWIP_CHECKSUM_ON_COPY */
+ buf->toport_chksum = 0;
+#if LWIP_NETBUF_RECVINFO
+ ip_addr_set_any(&buf->toaddr);
+#endif /* LWIP_NETBUF_RECVINFO */
+#endif /* LWIP_NETBUF_RECVINFO || LWIP_CHECKSUM_ON_COPY */
+ return buf;
+ } else {
+ return NULL;
+ }
+}
+
+/**
+ * Deallocate a netbuf allocated by netbuf_new().
+ *
+ * @param buf pointer to a netbuf allocated by netbuf_new()
+ */
+void
+netbuf_delete(struct netbuf *buf)
+{
+ if (buf != NULL) {
+ if (buf->p != NULL) {
+ pbuf_free(buf->p);
+ buf->p = buf->ptr = NULL;
+ }
+ memp_free(MEMP_NETBUF, buf);
+ }
+}
+
+/**
+ * Allocate memory for a packet buffer for a given netbuf.
+ *
+ * @param buf the netbuf for which to allocate a packet buffer
+ * @param size the size of the packet buffer to allocate
+ * @return pointer to the allocated memory
+ * NULL if no memory could be allocated
+ */
+void *
+netbuf_alloc(struct netbuf *buf, u16_t size)
+{
+ LWIP_ERROR("netbuf_alloc: invalid buf", (buf != NULL), return NULL;);
+
+ /* Deallocate any previously allocated memory. */
+ if (buf->p != NULL) {
+ pbuf_free(buf->p);
+ }
+ buf->p = pbuf_alloc(PBUF_TRANSPORT, size, PBUF_RAM);
+ if (buf->p == NULL) {
+ return NULL;
+ }
+ LWIP_ASSERT("check that first pbuf can hold size",
+ (buf->p->len >= size));
+ buf->ptr = buf->p;
+ return buf->p->payload;
+}
+
+/**
+ * Free the packet buffer included in a netbuf
+ *
+ * @param buf pointer to the netbuf which contains the packet buffer to free
+ */
+void
+netbuf_free(struct netbuf *buf)
+{
+ LWIP_ERROR("netbuf_free: invalid buf", (buf != NULL), return;);
+ if (buf->p != NULL) {
+ pbuf_free(buf->p);
+ }
+ buf->p = buf->ptr = NULL;
+}
+
+/**
+ * Let a netbuf reference existing (non-volatile) data.
+ *
+ * @param buf netbuf which should reference the data
+ * @param dataptr pointer to the data to reference
+ * @param size size of the data
+ * @return ERR_OK if data is referenced
+ * ERR_MEM if data couldn't be referenced due to lack of memory
+ */
+err_t
+netbuf_ref(struct netbuf *buf, const void *dataptr, u16_t size)
+{
+ LWIP_ERROR("netbuf_ref: invalid buf", (buf != NULL), return ERR_ARG;);
+ if (buf->p != NULL) {
+ pbuf_free(buf->p);
+ }
+ buf->p = pbuf_alloc(PBUF_TRANSPORT, 0, PBUF_REF);
+ if (buf->p == NULL) {
+ buf->ptr = NULL;
+ return ERR_MEM;
+ }
+ buf->p->payload = (void*)dataptr;
+ buf->p->len = buf->p->tot_len = size;
+ buf->ptr = buf->p;
+ return ERR_OK;
+}
+
+/**
+ * Chain one netbuf to another (@see pbuf_chain)
+ *
+ * @param head the first netbuf
+ * @param tail netbuf to chain after head, freed by this function, may not be reference after returning
+ */
+void
+netbuf_chain(struct netbuf *head, struct netbuf *tail)
+{
+ LWIP_ERROR("netbuf_ref: invalid head", (head != NULL), return;);
+ LWIP_ERROR("netbuf_chain: invalid tail", (tail != NULL), return;);
+ pbuf_cat(head->p, tail->p);
+ head->ptr = head->p;
+ memp_free(MEMP_NETBUF, tail);
+}
+
+/**
+ * Get the data pointer and length of the data inside a netbuf.
+ *
+ * @param buf netbuf to get the data from
+ * @param dataptr pointer to a void pointer where to store the data pointer
+ * @param len pointer to an u16_t where the length of the data is stored
+ * @return ERR_OK if the information was retreived,
+ * ERR_BUF on error.
+ */
+err_t
+netbuf_data(struct netbuf *buf, void **dataptr, u16_t *len)
+{
+ LWIP_ERROR("netbuf_data: invalid buf", (buf != NULL), return ERR_ARG;);
+ LWIP_ERROR("netbuf_data: invalid dataptr", (dataptr != NULL), return ERR_ARG;);
+ LWIP_ERROR("netbuf_data: invalid len", (len != NULL), return ERR_ARG;);
+
+ if (buf->ptr == NULL) {
+ return ERR_BUF;
+ }
+ *dataptr = buf->ptr->payload;
+ *len = buf->ptr->len;
+ return ERR_OK;
+}
+
+/**
+ * Move the current data pointer of a packet buffer contained in a netbuf
+ * to the next part.
+ * The packet buffer itself is not modified.
+ *
+ * @param buf the netbuf to modify
+ * @return -1 if there is no next part
+ * 1 if moved to the next part but now there is no next part
+ * 0 if moved to the next part and there are still more parts
+ */
+s8_t
+netbuf_next(struct netbuf *buf)
+{
+ LWIP_ERROR("netbuf_free: invalid buf", (buf != NULL), return -1;);
+ if (buf->ptr->next == NULL) {
+ return -1;
+ }
+ buf->ptr = buf->ptr->next;
+ if (buf->ptr->next == NULL) {
+ return 1;
+ }
+ return 0;
+}
+
+/**
+ * Move the current data pointer of a packet buffer contained in a netbuf
+ * to the beginning of the packet.
+ * The packet buffer itself is not modified.
+ *
+ * @param buf the netbuf to modify
+ */
+void
+netbuf_first(struct netbuf *buf)
+{
+ LWIP_ERROR("netbuf_free: invalid buf", (buf != NULL), return;);
+ buf->ptr = buf->p;
+}
+
+#endif /* LWIP_NETCONN */
--- /dev/null
+/**
+ * @file
+ * API functions for name resolving
+ *
+ */
+
+/*
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Simon Goldschmidt
+ *
+ */
+
+#include "lwip/netdb.h"
+
+#if LWIP_DNS && LWIP_SOCKET
+
+#include "lwip/err.h"
+#include "lwip/mem.h"
+#include "lwip/memp.h"
+#include "lwip/ip_addr.h"
+#include "lwip/api.h"
+#include "lwip/dns.h"
+
+#include <string.h>
+#include <stdlib.h>
+
+/** helper struct for gethostbyname_r to access the char* buffer */
+struct gethostbyname_r_helper {
+ ip_addr_t *addrs;
+ ip_addr_t addr;
+ char *aliases;
+};
+
+/** h_errno is exported in netdb.h for access by applications. */
+#if LWIP_DNS_API_DECLARE_H_ERRNO
+int h_errno;
+#endif /* LWIP_DNS_API_DECLARE_H_ERRNO */
+
+/** define "hostent" variables storage: 0 if we use a static (but unprotected)
+ * set of variables for lwip_gethostbyname, 1 if we use a local storage */
+#ifndef LWIP_DNS_API_HOSTENT_STORAGE
+#define LWIP_DNS_API_HOSTENT_STORAGE 0
+#endif
+
+/** define "hostent" variables storage */
+#if LWIP_DNS_API_HOSTENT_STORAGE
+#define HOSTENT_STORAGE
+#else
+#define HOSTENT_STORAGE static
+#endif /* LWIP_DNS_API_STATIC_HOSTENT */
+
+/**
+ * Returns an entry containing addresses of address family AF_INET
+ * for the host with name name.
+ * Due to dns_gethostbyname limitations, only one address is returned.
+ *
+ * @param name the hostname to resolve
+ * @return an entry containing addresses of address family AF_INET
+ * for the host with name name
+ */
+struct hostent*
+lwip_gethostbyname(const char *name)
+{
+ err_t err;
+ ip_addr_t addr;
+
+ /* buffer variables for lwip_gethostbyname() */
+ HOSTENT_STORAGE struct hostent s_hostent;
+ HOSTENT_STORAGE char *s_aliases;
+ HOSTENT_STORAGE ip_addr_t s_hostent_addr;
+ HOSTENT_STORAGE ip_addr_t *s_phostent_addr[2];
+
+ /* query host IP address */
+ err = netconn_gethostbyname(name, &addr);
+ if (err != ERR_OK) {
+ LWIP_DEBUGF(DNS_DEBUG, ("lwip_gethostbyname(%s) failed, err=%d\n", name, err));
+ h_errno = HOST_NOT_FOUND;
+ return NULL;
+ }
+
+ /* fill hostent */
+ s_hostent_addr = addr;
+ s_phostent_addr[0] = &s_hostent_addr;
+ s_phostent_addr[1] = NULL;
+ s_hostent.h_name = (char*)name;
+ s_hostent.h_aliases = &s_aliases;
+ s_hostent.h_addrtype = AF_INET;
+ s_hostent.h_length = sizeof(ip_addr_t);
+ s_hostent.h_addr_list = (char**)&s_phostent_addr;
+
+#if DNS_DEBUG
+ /* dump hostent */
+ LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_name == %s\n", s_hostent.h_name));
+ LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases == %p\n", s_hostent.h_aliases));
+ if (s_hostent.h_aliases != NULL) {
+ u8_t idx;
+ for ( idx=0; s_hostent.h_aliases[idx]; idx++) {
+ LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases[%i]-> == %p\n", idx, s_hostent.h_aliases[idx]));
+ LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases[%i]-> == %s\n", idx, s_hostent.h_aliases[idx]));
+ }
+ }
+ LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addrtype == %d\n", s_hostent.h_addrtype));
+ LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_length == %d\n", s_hostent.h_length));
+ LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list == %p\n", s_hostent.h_addr_list));
+ if (s_hostent.h_addr_list != NULL) {
+ u8_t idx;
+ for ( idx=0; s_hostent.h_addr_list[idx]; idx++) {
+ LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list[%i] == %p\n", idx, s_hostent.h_addr_list[idx]));
+ LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list[%i]-> == %s\n", idx, ip_ntoa((ip_addr_t*)s_hostent.h_addr_list[idx])));
+ }
+ }
+#endif /* DNS_DEBUG */
+
+#if LWIP_DNS_API_HOSTENT_STORAGE
+ /* this function should return the "per-thread" hostent after copy from s_hostent */
+ return sys_thread_hostent(&s_hostent);
+#else
+ return &s_hostent;
+#endif /* LWIP_DNS_API_HOSTENT_STORAGE */
+}
+
+/**
+ * Thread-safe variant of lwip_gethostbyname: instead of using a static
+ * buffer, this function takes buffer and errno pointers as arguments
+ * and uses these for the result.
+ *
+ * @param name the hostname to resolve
+ * @param ret pre-allocated struct where to store the result
+ * @param buf pre-allocated buffer where to store additional data
+ * @param buflen the size of buf
+ * @param result pointer to a hostent pointer that is set to ret on success
+ * and set to zero on error
+ * @param h_errnop pointer to an int where to store errors (instead of modifying
+ * the global h_errno)
+ * @return 0 on success, non-zero on error, additional error information
+ * is stored in *h_errnop instead of h_errno to be thread-safe
+ */
+int
+lwip_gethostbyname_r(const char *name, struct hostent *ret, char *buf,
+ size_t buflen, struct hostent **result, int *h_errnop)
+{
+ err_t err;
+ struct gethostbyname_r_helper *h;
+ char *hostname;
+ size_t namelen;
+ int lh_errno;
+
+ if (h_errnop == NULL) {
+ /* ensure h_errnop is never NULL */
+ h_errnop = &lh_errno;
+ }
+
+ if (result == NULL) {
+ /* not all arguments given */
+ *h_errnop = EINVAL;
+ return -1;
+ }
+ /* first thing to do: set *result to nothing */
+ *result = NULL;
+ if ((name == NULL) || (ret == NULL) || (buf == 0)) {
+ /* not all arguments given */
+ *h_errnop = EINVAL;
+ return -1;
+ }
+
+ namelen = strlen(name);
+ if (buflen < (sizeof(struct gethostbyname_r_helper) + namelen + 1 + (MEM_ALIGNMENT - 1))) {
+ /* buf can't hold the data needed + a copy of name */
+ *h_errnop = ERANGE;
+ return -1;
+ }
+
+ h = (struct gethostbyname_r_helper*)LWIP_MEM_ALIGN(buf);
+ hostname = ((char*)h) + sizeof(struct gethostbyname_r_helper);
+
+ /* query host IP address */
+ err = netconn_gethostbyname(name, &(h->addr));
+ if (err != ERR_OK) {
+ LWIP_DEBUGF(DNS_DEBUG, ("lwip_gethostbyname(%s) failed, err=%d\n", name, err));
+ *h_errnop = ENSRNOTFOUND;
+ return -1;
+ }
+
+ /* copy the hostname into buf */
+ MEMCPY(hostname, name, namelen);
+ hostname[namelen] = 0;
+
+ /* fill hostent */
+ h->addrs = &(h->addr);
+ h->aliases = NULL;
+ ret->h_name = (char*)hostname;
+ ret->h_aliases = &(h->aliases);
+ ret->h_addrtype = AF_INET;
+ ret->h_length = sizeof(ip_addr_t);
+ ret->h_addr_list = (char**)&(h->addrs);
+
+ /* set result != NULL */
+ *result = ret;
+
+ /* return success */
+ return 0;
+}
+
+/**
+ * Frees one or more addrinfo structures returned by getaddrinfo(), along with
+ * any additional storage associated with those structures. If the ai_next field
+ * of the structure is not null, the entire list of structures is freed.
+ *
+ * @param ai struct addrinfo to free
+ */
+void
+lwip_freeaddrinfo(struct addrinfo *ai)
+{
+ struct addrinfo *next;
+
+ while (ai != NULL) {
+ next = ai->ai_next;
+ memp_free(MEMP_NETDB, ai);
+ ai = next;
+ }
+}
+
+/**
+ * Translates the name of a service location (for example, a host name) and/or
+ * a service name and returns a set of socket addresses and associated
+ * information to be used in creating a socket with which to address the
+ * specified service.
+ * Memory for the result is allocated internally and must be freed by calling
+ * lwip_freeaddrinfo()!
+ *
+ * Due to a limitation in dns_gethostbyname, only the first address of a
+ * host is returned.
+ * Also, service names are not supported (only port numbers)!
+ *
+ * @param nodename descriptive name or address string of the host
+ * (may be NULL -> local address)
+ * @param servname port number as string of NULL
+ * @param hints structure containing input values that set socktype and protocol
+ * @param res pointer to a pointer where to store the result (set to NULL on failure)
+ * @return 0 on success, non-zero on failure
+ */
+int
+lwip_getaddrinfo(const char *nodename, const char *servname,
+ const struct addrinfo *hints, struct addrinfo **res)
+{
+ err_t err;
+ ip_addr_t addr;
+ struct addrinfo *ai;
+ struct sockaddr_in *sa = NULL;
+ int port_nr = 0;
+ size_t total_size;
+ size_t namelen = 0;
+
+ if (res == NULL) {
+ return EAI_FAIL;
+ }
+ *res = NULL;
+ if ((nodename == NULL) && (servname == NULL)) {
+ return EAI_NONAME;
+ }
+
+ if (servname != NULL) {
+ /* service name specified: convert to port number
+ * @todo?: currently, only ASCII integers (port numbers) are supported! */
+ port_nr = atoi(servname);
+ if ((port_nr <= 0) || (port_nr > 0xffff)) {
+ return EAI_SERVICE;
+ }
+ }
+
+ if (nodename != NULL) {
+ /* service location specified, try to resolve */
+ err = netconn_gethostbyname(nodename, &addr);
+ if (err != ERR_OK) {
+ return EAI_FAIL;
+ }
+ } else {
+ /* service location specified, use loopback address */
+ ip_addr_set_loopback(&addr);
+ }
+
+ total_size = sizeof(struct addrinfo) + sizeof(struct sockaddr_in);
+ if (nodename != NULL) {
+ namelen = strlen(nodename);
+ LWIP_ASSERT("namelen is too long", (namelen + 1) <= (mem_size_t)-1);
+ total_size += namelen + 1;
+ }
+ /* If this fails, please report to lwip-devel! :-) */
+ LWIP_ASSERT("total_size <= NETDB_ELEM_SIZE: please report this!",
+ total_size <= NETDB_ELEM_SIZE);
+ ai = (struct addrinfo *)memp_malloc(MEMP_NETDB);
+ if (ai == NULL) {
+ goto memerr;
+ }
+ memset(ai, 0, total_size);
+ sa = (struct sockaddr_in*)((u8_t*)ai + sizeof(struct addrinfo));
+ /* set up sockaddr */
+ inet_addr_from_ipaddr(&sa->sin_addr, &addr);
+ sa->sin_family = AF_INET;
+ sa->sin_len = sizeof(struct sockaddr_in);
+ sa->sin_port = htons((u16_t)port_nr);
+
+ /* set up addrinfo */
+ ai->ai_family = AF_INET;
+ if (hints != NULL) {
+ /* copy socktype & protocol from hints if specified */
+ ai->ai_socktype = hints->ai_socktype;
+ ai->ai_protocol = hints->ai_protocol;
+ }
+ if (nodename != NULL) {
+ /* copy nodename to canonname if specified */
+ ai->ai_canonname = ((char*)ai + sizeof(struct addrinfo) + sizeof(struct sockaddr_in));
+ MEMCPY(ai->ai_canonname, nodename, namelen);
+ ai->ai_canonname[namelen] = 0;
+ }
+ ai->ai_addrlen = sizeof(struct sockaddr_in);
+ ai->ai_addr = (struct sockaddr*)sa;
+
+ *res = ai;
+
+ return 0;
+memerr:
+ if (ai != NULL) {
+ memp_free(MEMP_NETDB, ai);
+ }
+ return EAI_MEMORY;
+}
+
+#endif /* LWIP_DNS && LWIP_SOCKET */
--- /dev/null
+/**
+ * @file
+ * Network Interface Sequential API module
+ *
+ */
+
+/*
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_NETIF_API /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/netifapi.h"
+#include "lwip/tcpip.h"
+
+/**
+ * Call netif_add() inside the tcpip_thread context.
+ */
+void
+do_netifapi_netif_add(struct netifapi_msg_msg *msg)
+{
+ if (!netif_add( msg->netif,
+ msg->msg.add.ipaddr,
+ msg->msg.add.netmask,
+ msg->msg.add.gw,
+ msg->msg.add.state,
+ msg->msg.add.init,
+ msg->msg.add.input)) {
+ msg->err = ERR_IF;
+ } else {
+ msg->err = ERR_OK;
+ }
+ TCPIP_NETIFAPI_ACK(msg);
+}
+
+/**
+ * Call netif_set_addr() inside the tcpip_thread context.
+ */
+void
+do_netifapi_netif_set_addr(struct netifapi_msg_msg *msg)
+{
+ netif_set_addr( msg->netif,
+ msg->msg.add.ipaddr,
+ msg->msg.add.netmask,
+ msg->msg.add.gw);
+ msg->err = ERR_OK;
+ TCPIP_NETIFAPI_ACK(msg);
+}
+
+/**
+ * Call the "errtfunc" (or the "voidfunc" if "errtfunc" is NULL) inside the
+ * tcpip_thread context.
+ */
+void
+do_netifapi_netif_common(struct netifapi_msg_msg *msg)
+{
+ if (msg->msg.common.errtfunc != NULL) {
+ msg->err = msg->msg.common.errtfunc(msg->netif);
+ } else {
+ msg->err = ERR_OK;
+ msg->msg.common.voidfunc(msg->netif);
+ }
+ TCPIP_NETIFAPI_ACK(msg);
+}
+
+/**
+ * Call netif_add() in a thread-safe way by running that function inside the
+ * tcpip_thread context.
+ *
+ * @note for params @see netif_add()
+ */
+err_t
+netifapi_netif_add(struct netif *netif,
+ ip_addr_t *ipaddr,
+ ip_addr_t *netmask,
+ ip_addr_t *gw,
+ void *state,
+ netif_init_fn init,
+ netif_input_fn input)
+{
+ struct netifapi_msg msg;
+ msg.function = do_netifapi_netif_add;
+ msg.msg.netif = netif;
+ msg.msg.msg.add.ipaddr = ipaddr;
+ msg.msg.msg.add.netmask = netmask;
+ msg.msg.msg.add.gw = gw;
+ msg.msg.msg.add.state = state;
+ msg.msg.msg.add.init = init;
+ msg.msg.msg.add.input = input;
+ TCPIP_NETIFAPI(&msg);
+ return msg.msg.err;
+}
+
+/**
+ * Call netif_set_addr() in a thread-safe way by running that function inside the
+ * tcpip_thread context.
+ *
+ * @note for params @see netif_set_addr()
+ */
+err_t
+netifapi_netif_set_addr(struct netif *netif,
+ ip_addr_t *ipaddr,
+ ip_addr_t *netmask,
+ ip_addr_t *gw)
+{
+ struct netifapi_msg msg;
+ msg.function = do_netifapi_netif_set_addr;
+ msg.msg.netif = netif;
+ msg.msg.msg.add.ipaddr = ipaddr;
+ msg.msg.msg.add.netmask = netmask;
+ msg.msg.msg.add.gw = gw;
+ TCPIP_NETIFAPI(&msg);
+ return msg.msg.err;
+}
+
+/**
+ * call the "errtfunc" (or the "voidfunc" if "errtfunc" is NULL) in a thread-safe
+ * way by running that function inside the tcpip_thread context.
+ *
+ * @note use only for functions where there is only "netif" parameter.
+ */
+err_t
+netifapi_netif_common(struct netif *netif, netifapi_void_fn voidfunc,
+ netifapi_errt_fn errtfunc)
+{
+ struct netifapi_msg msg;
+ msg.function = do_netifapi_netif_common;
+ msg.msg.netif = netif;
+ msg.msg.msg.common.voidfunc = voidfunc;
+ msg.msg.msg.common.errtfunc = errtfunc;
+ TCPIP_NETIFAPI(&msg);
+ return msg.msg.err;
+}
+
+#endif /* LWIP_NETIF_API */
--- /dev/null
+/**
+ * @file
+ * Sockets BSD-Like API module
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ * Improved by Marc Boucher <marc@mbsi.ca> and David Haas <dhaas@alum.rpi.edu>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_SOCKET /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/sockets.h"
+#include "lwip/api.h"
+#include "lwip/sys.h"
+#include "lwip/igmp.h"
+#include "lwip/inet.h"
+#include "lwip/tcp.h"
+#include "lwip/raw.h"
+#include "lwip/udp.h"
+#include "lwip/tcpip.h"
+#include "lwip/pbuf.h"
+#if LWIP_CHECKSUM_ON_COPY
+#include "lwip/inet_chksum.h"
+#endif
+
+#include <string.h>
+
+#define NUM_SOCKETS MEMP_NUM_NETCONN
+
+/** Contains all internal pointers and states used for a socket */
+struct lwip_sock {
+ /** sockets currently are built on netconns, each socket has one netconn */
+ struct netconn *conn;
+ /** data that was left from the previous read */
+ void *lastdata;
+ /** offset in the data that was left from the previous read */
+ u16_t lastoffset;
+ /** number of times data was received, set by event_callback(),
+ tested by the receive and select functions */
+ s16_t rcvevent;
+ /** number of times data was ACKed (free send buffer), set by event_callback(),
+ tested by select */
+ u16_t sendevent;
+ /** error happened for this socket, set by event_callback(), tested by select */
+ u16_t errevent;
+ /** last error that occurred on this socket */
+ int err;
+ /** counter of how many threads are waiting for this socket using select */
+ int select_waiting;
+};
+
+/** Description for a task waiting in select */
+struct lwip_select_cb {
+ /** Pointer to the next waiting task */
+ struct lwip_select_cb *next;
+ /** Pointer to the previous waiting task */
+ struct lwip_select_cb *prev;
+ /** readset passed to select */
+ fd_set *readset;
+ /** writeset passed to select */
+ fd_set *writeset;
+ /** unimplemented: exceptset passed to select */
+ fd_set *exceptset;
+ /** don't signal the same semaphore twice: set to 1 when signalled */
+ int sem_signalled;
+ /** semaphore to wake up a task waiting for select */
+ sys_sem_t sem;
+};
+
+/** This struct is used to pass data to the set/getsockopt_internal
+ * functions running in tcpip_thread context (only a void* is allowed) */
+struct lwip_setgetsockopt_data {
+ /** socket struct for which to change options */
+ struct lwip_sock *sock;
+#ifdef LWIP_DEBUG
+ /** socket index for which to change options */
+ int s;
+#endif /* LWIP_DEBUG */
+ /** level of the option to process */
+ int level;
+ /** name of the option to process */
+ int optname;
+ /** set: value to set the option to
+ * get: value of the option is stored here */
+ void *optval;
+ /** size of *optval */
+ socklen_t *optlen;
+ /** if an error occures, it is temporarily stored here */
+ err_t err;
+};
+
+/** The global array of available sockets */
+static struct lwip_sock sockets[NUM_SOCKETS];
+/** The global list of tasks waiting for select */
+static struct lwip_select_cb *select_cb_list;
+/** This counter is increased from lwip_select when the list is chagned
+ and checked in event_callback to see if it has changed. */
+static volatile int select_cb_ctr;
+
+/** Table to quickly map an lwIP error (err_t) to a socket error
+ * by using -err as an index */
+static const int err_to_errno_table[] = {
+ 0, /* ERR_OK 0 No error, everything OK. */
+ ENOMEM, /* ERR_MEM -1 Out of memory error. */
+ ENOBUFS, /* ERR_BUF -2 Buffer error. */
+ EWOULDBLOCK, /* ERR_TIMEOUT -3 Timeout */
+ EHOSTUNREACH, /* ERR_RTE -4 Routing problem. */
+ EINPROGRESS, /* ERR_INPROGRESS -5 Operation in progress */
+ EINVAL, /* ERR_VAL -6 Illegal value. */
+ EWOULDBLOCK, /* ERR_WOULDBLOCK -7 Operation would block. */
+ EADDRINUSE, /* ERR_USE -8 Address in use. */
+ EALREADY, /* ERR_ISCONN -9 Already connected. */
+ ECONNABORTED, /* ERR_ABRT -10 Connection aborted. */
+ ECONNRESET, /* ERR_RST -11 Connection reset. */
+ ENOTCONN, /* ERR_CLSD -12 Connection closed. */
+ ENOTCONN, /* ERR_CONN -13 Not connected. */
+ EIO, /* ERR_ARG -14 Illegal argument. */
+ -1, /* ERR_IF -15 Low-level netif error */
+};
+
+#define ERR_TO_ERRNO_TABLE_SIZE \
+ (sizeof(err_to_errno_table)/sizeof(err_to_errno_table[0]))
+
+#define err_to_errno(err) \
+ ((unsigned)(-(err)) < ERR_TO_ERRNO_TABLE_SIZE ? \
+ err_to_errno_table[-(err)] : EIO)
+
+#ifdef ERRNO
+#ifndef set_errno
+#define set_errno(err) errno = (err)
+#endif
+#else /* ERRNO */
+#define set_errno(err)
+#endif /* ERRNO */
+
+#define sock_set_errno(sk, e) do { \
+ sk->err = (e); \
+ set_errno(sk->err); \
+} while (0)
+
+/* Forward delcaration of some functions */
+static void event_callback(struct netconn *conn, enum netconn_evt evt, u16_t len);
+static void lwip_getsockopt_internal(void *arg);
+static void lwip_setsockopt_internal(void *arg);
+
+/**
+ * Initialize this module. This function has to be called before any other
+ * functions in this module!
+ */
+void
+lwip_socket_init(void)
+{
+}
+
+/**
+ * Map a externally used socket index to the internal socket representation.
+ *
+ * @param s externally used socket index
+ * @return struct lwip_sock for the socket or NULL if not found
+ */
+static struct lwip_sock *
+get_socket(int s)
+{
+ struct lwip_sock *sock;
+
+ if ((s < 0) || (s >= NUM_SOCKETS)) {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("get_socket(%d): invalid\n", s));
+ set_errno(EBADF);
+ return NULL;
+ }
+
+ sock = &sockets[s];
+
+ if (!sock->conn) {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("get_socket(%d): not active\n", s));
+ set_errno(EBADF);
+ return NULL;
+ }
+
+ return sock;
+}
+
+/**
+ * Same as get_socket but doesn't set errno
+ *
+ * @param s externally used socket index
+ * @return struct lwip_sock for the socket or NULL if not found
+ */
+static struct lwip_sock *
+tryget_socket(int s)
+{
+ if ((s < 0) || (s >= NUM_SOCKETS)) {
+ return NULL;
+ }
+ if (!sockets[s].conn) {
+ return NULL;
+ }
+ return &sockets[s];
+}
+
+/**
+ * Allocate a new socket for a given netconn.
+ *
+ * @param newconn the netconn for which to allocate a socket
+ * @param accepted 1 if socket has been created by accept(),
+ * 0 if socket has been created by socket()
+ * @return the index of the new socket; -1 on error
+ */
+static int
+alloc_socket(struct netconn *newconn, int accepted)
+{
+ int i;
+ SYS_ARCH_DECL_PROTECT(lev);
+
+ /* allocate a new socket identifier */
+ for (i = 0; i < NUM_SOCKETS; ++i) {
+ /* Protect socket array */
+ SYS_ARCH_PROTECT(lev);
+ if (!sockets[i].conn) {
+ sockets[i].conn = newconn;
+ /* The socket is not yet known to anyone, so no need to protect
+ after having marked it as used. */
+ SYS_ARCH_UNPROTECT(lev);
+ sockets[i].lastdata = NULL;
+ sockets[i].lastoffset = 0;
+ sockets[i].rcvevent = 0;
+ /* TCP sendbuf is empty, but the socket is not yet writable until connected
+ * (unless it has been created by accept()). */
+ sockets[i].sendevent = (newconn->type == NETCONN_TCP ? (accepted != 0) : 1);
+ sockets[i].errevent = 0;
+ sockets[i].err = 0;
+ sockets[i].select_waiting = 0;
+ return i;
+ }
+ SYS_ARCH_UNPROTECT(lev);
+ }
+ return -1;
+}
+
+/** Free a socket. The socket's netconn must have been
+ * delete before!
+ *
+ * @param sock the socket to free
+ * @param is_tcp != 0 for TCP sockets, used to free lastdata
+ */
+static void
+free_socket(struct lwip_sock *sock, int is_tcp)
+{
+ void *lastdata;
+ SYS_ARCH_DECL_PROTECT(lev);
+
+ lastdata = sock->lastdata;
+ sock->lastdata = NULL;
+ sock->lastoffset = 0;
+ sock->err = 0;
+
+ /* Protect socket array */
+ SYS_ARCH_PROTECT(lev);
+ sock->conn = NULL;
+ SYS_ARCH_UNPROTECT(lev);
+ /* don't use 'sock' after this line, as another task might have allocated it */
+
+ if (lastdata != NULL) {
+ if (is_tcp) {
+ pbuf_free((struct pbuf *)lastdata);
+ } else {
+ netbuf_delete((struct netbuf *)lastdata);
+ }
+ }
+}
+
+/* Below this, the well-known socket functions are implemented.
+ * Use google.com or opengroup.org to get a good description :-)
+ *
+ * Exceptions are documented!
+ */
+
+int
+lwip_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
+{
+ struct lwip_sock *sock, *nsock;
+ struct netconn *newconn;
+ ip_addr_t naddr;
+ u16_t port;
+ int newsock;
+ struct sockaddr_in sin;
+ err_t err;
+ SYS_ARCH_DECL_PROTECT(lev);
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_accept(%d)...\n", s));
+ sock = get_socket(s);
+ if (!sock) {
+ return -1;
+ }
+
+ if (netconn_is_nonblocking(sock->conn) && (sock->rcvevent <= 0)) {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_accept(%d): returning EWOULDBLOCK\n", s));
+ sock_set_errno(sock, EWOULDBLOCK);
+ return -1;
+ }
+
+ /* wait for a new connection */
+ err = netconn_accept(sock->conn, &newconn);
+ if (err != ERR_OK) {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_accept(%d): netconn_acept failed, err=%d\n", s, err));
+ sock_set_errno(sock, err_to_errno(err));
+ return -1;
+ }
+ LWIP_ASSERT("newconn != NULL", newconn != NULL);
+ /* Prevent automatic window updates, we do this on our own! */
+ netconn_set_noautorecved(newconn, 1);
+
+ /* get the IP address and port of the remote host */
+ err = netconn_peer(newconn, &naddr, &port);
+ if (err != ERR_OK) {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_accept(%d): netconn_peer failed, err=%d\n", s, err));
+ netconn_delete(newconn);
+ sock_set_errno(sock, err_to_errno(err));
+ return -1;
+ }
+
+ /* Note that POSIX only requires us to check addr is non-NULL. addrlen must
+ * not be NULL if addr is valid.
+ */
+ if (NULL != addr) {
+ LWIP_ASSERT("addr valid but addrlen NULL", addrlen != NULL);
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_len = sizeof(sin);
+ sin.sin_family = AF_INET;
+ sin.sin_port = htons(port);
+ inet_addr_from_ipaddr(&sin.sin_addr, &naddr);
+
+ if (*addrlen > sizeof(sin))
+ *addrlen = sizeof(sin);
+
+ MEMCPY(addr, &sin, *addrlen);
+ }
+
+ newsock = alloc_socket(newconn, 1);
+ if (newsock == -1) {
+ netconn_delete(newconn);
+ sock_set_errno(sock, ENFILE);
+ return -1;
+ }
+ LWIP_ASSERT("invalid socket index", (newsock >= 0) && (newsock < NUM_SOCKETS));
+ LWIP_ASSERT("newconn->callback == event_callback", newconn->callback == event_callback);
+ nsock = &sockets[newsock];
+
+ /* See event_callback: If data comes in right away after an accept, even
+ * though the server task might not have created a new socket yet.
+ * In that case, newconn->socket is counted down (newconn->socket--),
+ * so nsock->rcvevent is >= 1 here!
+ */
+ SYS_ARCH_PROTECT(lev);
+ nsock->rcvevent += (s16_t)(-1 - newconn->socket);
+ newconn->socket = newsock;
+ SYS_ARCH_UNPROTECT(lev);
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_accept(%d) returning new sock=%d addr=", s, newsock));
+ ip_addr_debug_print(SOCKETS_DEBUG, &naddr);
+ LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F"\n", port));
+
+ sock_set_errno(sock, 0);
+ return newsock;
+}
+
+int
+lwip_bind(int s, const struct sockaddr *name, socklen_t namelen)
+{
+ struct lwip_sock *sock;
+ ip_addr_t local_addr;
+ u16_t local_port;
+ err_t err;
+ const struct sockaddr_in *name_in;
+
+ sock = get_socket(s);
+ if (!sock) {
+ return -1;
+ }
+
+ /* check size, familiy and alignment of 'name' */
+ LWIP_ERROR("lwip_bind: invalid address", ((namelen == sizeof(struct sockaddr_in)) &&
+ ((name->sa_family) == AF_INET) && ((((mem_ptr_t)name) % 4) == 0)),
+ sock_set_errno(sock, err_to_errno(ERR_ARG)); return -1;);
+ name_in = (const struct sockaddr_in *)(void*)name;
+
+ inet_addr_to_ipaddr(&local_addr, &name_in->sin_addr);
+ local_port = name_in->sin_port;
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_bind(%d, addr=", s));
+ ip_addr_debug_print(SOCKETS_DEBUG, &local_addr);
+ LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F")\n", ntohs(local_port)));
+
+ err = netconn_bind(sock->conn, &local_addr, ntohs(local_port));
+
+ if (err != ERR_OK) {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_bind(%d) failed, err=%d\n", s, err));
+ sock_set_errno(sock, err_to_errno(err));
+ return -1;
+ }
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_bind(%d) succeeded\n", s));
+ sock_set_errno(sock, 0);
+ return 0;
+}
+
+int
+lwip_close(int s)
+{
+ struct lwip_sock *sock;
+ int is_tcp = 0;
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_close(%d)\n", s));
+
+ sock = get_socket(s);
+ if (!sock) {
+ return -1;
+ }
+
+ if(sock->conn != NULL) {
+ is_tcp = netconn_type(sock->conn) == NETCONN_TCP;
+ } else {
+ LWIP_ASSERT("sock->lastdata == NULL", sock->lastdata == NULL);
+ }
+
+ netconn_delete(sock->conn);
+
+ free_socket(sock, is_tcp);
+ set_errno(0);
+ return 0;
+}
+
+int
+lwip_connect(int s, const struct sockaddr *name, socklen_t namelen)
+{
+ struct lwip_sock *sock;
+ err_t err;
+ const struct sockaddr_in *name_in;
+
+ sock = get_socket(s);
+ if (!sock) {
+ return -1;
+ }
+
+ /* check size, familiy and alignment of 'name' */
+ LWIP_ERROR("lwip_connect: invalid address", ((namelen == sizeof(struct sockaddr_in)) &&
+ ((name->sa_family) == AF_INET) && ((((mem_ptr_t)name) % 4) == 0)),
+ sock_set_errno(sock, err_to_errno(ERR_ARG)); return -1;);
+ name_in = (const struct sockaddr_in *)(void*)name;
+
+ if (name_in->sin_family == AF_UNSPEC) {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_connect(%d, AF_UNSPEC)\n", s));
+ err = netconn_disconnect(sock->conn);
+ } else {
+ ip_addr_t remote_addr;
+ u16_t remote_port;
+
+ inet_addr_to_ipaddr(&remote_addr, &name_in->sin_addr);
+ remote_port = name_in->sin_port;
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_connect(%d, addr=", s));
+ ip_addr_debug_print(SOCKETS_DEBUG, &remote_addr);
+ LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F")\n", ntohs(remote_port)));
+
+ err = netconn_connect(sock->conn, &remote_addr, ntohs(remote_port));
+ }
+
+ if (err != ERR_OK) {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_connect(%d) failed, err=%d\n", s, err));
+ sock_set_errno(sock, err_to_errno(err));
+ return -1;
+ }
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_connect(%d) succeeded\n", s));
+ sock_set_errno(sock, 0);
+ return 0;
+}
+
+/**
+ * Set a socket into listen mode.
+ * The socket may not have been used for another connection previously.
+ *
+ * @param s the socket to set to listening mode
+ * @param backlog (ATTENTION: needs TCP_LISTEN_BACKLOG=1)
+ * @return 0 on success, non-zero on failure
+ */
+int
+lwip_listen(int s, int backlog)
+{
+ struct lwip_sock *sock;
+ err_t err;
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_listen(%d, backlog=%d)\n", s, backlog));
+
+ sock = get_socket(s);
+ if (!sock) {
+ return -1;
+ }
+
+ /* limit the "backlog" parameter to fit in an u8_t */
+ backlog = LWIP_MIN(LWIP_MAX(backlog, 0), 0xff);
+
+ err = netconn_listen_with_backlog(sock->conn, (u8_t)backlog);
+
+ if (err != ERR_OK) {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_listen(%d) failed, err=%d\n", s, err));
+ sock_set_errno(sock, err_to_errno(err));
+ return -1;
+ }
+
+ sock_set_errno(sock, 0);
+ return 0;
+}
+
+int
+lwip_recvfrom(int s, void *mem, size_t len, int flags,
+ struct sockaddr *from, socklen_t *fromlen)
+{
+ struct lwip_sock *sock;
+ void *buf = NULL;
+ struct pbuf *p;
+ u16_t buflen, copylen;
+ int off = 0;
+ ip_addr_t *addr;
+ u16_t port;
+ u8_t done = 0;
+ err_t err;
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom(%d, %p, %"SZT_F", 0x%x, ..)\n", s, mem, len, flags));
+ sock = get_socket(s);
+ if (!sock) {
+ return -1;
+ }
+
+ do {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom: top while sock->lastdata=%p\n", sock->lastdata));
+ /* Check if there is data left from the last recv operation. */
+ if (sock->lastdata) {
+ buf = sock->lastdata;
+ } else {
+ /* If this is non-blocking call, then check first */
+ if (((flags & MSG_DONTWAIT) || netconn_is_nonblocking(sock->conn)) &&
+ (sock->rcvevent <= 0)) {
+ if (off > 0) {
+ /* update receive window */
+ netconn_recved(sock->conn, (u32_t)off);
+ /* already received data, return that */
+ sock_set_errno(sock, 0);
+ return off;
+ }
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom(%d): returning EWOULDBLOCK\n", s));
+ sock_set_errno(sock, EWOULDBLOCK);
+ return -1;
+ }
+
+ /* No data was left from the previous operation, so we try to get
+ some from the network. */
+ if (netconn_type(sock->conn) == NETCONN_TCP) {
+ err = netconn_recv_tcp_pbuf(sock->conn, (struct pbuf **)&buf);
+ } else {
+ err = netconn_recv(sock->conn, (struct netbuf **)&buf);
+ }
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom: netconn_recv err=%d, netbuf=%p\n",
+ err, buf));
+
+ if (err != ERR_OK) {
+ if (off > 0) {
+ /* update receive window */
+ netconn_recved(sock->conn, (u32_t)off);
+ /* already received data, return that */
+ sock_set_errno(sock, 0);
+ return off;
+ }
+ /* We should really do some error checking here. */
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom(%d): buf == NULL, error is \"%s\"!\n",
+ s, lwip_strerr(err)));
+ sock_set_errno(sock, err_to_errno(err));
+ if (err == ERR_CLSD) {
+ return 0;
+ } else {
+ return -1;
+ }
+ }
+ LWIP_ASSERT("buf != NULL", buf != NULL);
+ sock->lastdata = buf;
+ }
+
+ if (netconn_type(sock->conn) == NETCONN_TCP) {
+ p = (struct pbuf *)buf;
+ } else {
+ p = ((struct netbuf *)buf)->p;
+ }
+ buflen = p->tot_len;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom: buflen=%"U16_F" len=%"SZT_F" off=%d sock->lastoffset=%"U16_F"\n",
+ buflen, len, off, sock->lastoffset));
+
+ buflen -= sock->lastoffset;
+
+ if (len > buflen) {
+ copylen = buflen;
+ } else {
+ copylen = (u16_t)len;
+ }
+
+ /* copy the contents of the received buffer into
+ the supplied memory pointer mem */
+ pbuf_copy_partial(p, (u8_t*)mem + off, copylen, sock->lastoffset);
+
+ off += copylen;
+
+ if (netconn_type(sock->conn) == NETCONN_TCP) {
+ LWIP_ASSERT("invalid copylen, len would underflow", len >= copylen);
+ len -= copylen;
+ if ( (len <= 0) ||
+ (p->flags & PBUF_FLAG_PUSH) ||
+ (sock->rcvevent <= 0) ||
+ ((flags & MSG_PEEK)!=0)) {
+ done = 1;
+ }
+ } else {
+ done = 1;
+ }
+
+ /* Check to see from where the data was.*/
+ if (done) {
+ ip_addr_t fromaddr;
+ if (from && fromlen) {
+ struct sockaddr_in sin;
+
+ if (netconn_type(sock->conn) == NETCONN_TCP) {
+ addr = &fromaddr;
+ netconn_getaddr(sock->conn, addr, &port, 0);
+ } else {
+ addr = netbuf_fromaddr((struct netbuf *)buf);
+ port = netbuf_fromport((struct netbuf *)buf);
+ }
+
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_len = sizeof(sin);
+ sin.sin_family = AF_INET;
+ sin.sin_port = htons(port);
+ inet_addr_from_ipaddr(&sin.sin_addr, addr);
+
+ if (*fromlen > sizeof(sin)) {
+ *fromlen = sizeof(sin);
+ }
+
+ MEMCPY(from, &sin, *fromlen);
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom(%d): addr=", s));
+ ip_addr_debug_print(SOCKETS_DEBUG, addr);
+ LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F" len=%d\n", port, off));
+ } else {
+#if SOCKETS_DEBUG
+ if (netconn_type(sock->conn) == NETCONN_TCP) {
+ addr = &fromaddr;
+ netconn_getaddr(sock->conn, addr, &port, 0);
+ } else {
+ addr = netbuf_fromaddr((struct netbuf *)buf);
+ port = netbuf_fromport((struct netbuf *)buf);
+ }
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom(%d): addr=", s));
+ ip_addr_debug_print(SOCKETS_DEBUG, addr);
+ LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F" len=%d\n", port, off));
+#endif /* SOCKETS_DEBUG */
+ }
+ }
+
+ /* If we don't peek the incoming message... */
+ if ((flags & MSG_PEEK) == 0) {
+ /* If this is a TCP socket, check if there is data left in the
+ buffer. If so, it should be saved in the sock structure for next
+ time around. */
+ if ((netconn_type(sock->conn) == NETCONN_TCP) && (buflen - copylen > 0)) {
+ sock->lastdata = buf;
+ sock->lastoffset += copylen;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom: lastdata now netbuf=%p\n", buf));
+ } else {
+ sock->lastdata = NULL;
+ sock->lastoffset = 0;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom: deleting netbuf=%p\n", buf));
+ if (netconn_type(sock->conn) == NETCONN_TCP) {
+ pbuf_free((struct pbuf *)buf);
+ } else {
+ netbuf_delete((struct netbuf *)buf);
+ }
+ }
+ }
+ } while (!done);
+
+ if (off > 0) {
+ /* update receive window */
+ netconn_recved(sock->conn, (u32_t)off);
+ }
+ sock_set_errno(sock, 0);
+ return off;
+}
+
+int
+lwip_read(int s, void *mem, size_t len)
+{
+ return lwip_recvfrom(s, mem, len, 0, NULL, NULL);
+}
+
+int
+lwip_recv(int s, void *mem, size_t len, int flags)
+{
+ return lwip_recvfrom(s, mem, len, flags, NULL, NULL);
+}
+
+int
+lwip_send(int s, const void *data, size_t size, int flags)
+{
+ struct lwip_sock *sock;
+ err_t err;
+ u8_t write_flags;
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_send(%d, data=%p, size=%"SZT_F", flags=0x%x)\n",
+ s, data, size, flags));
+
+ sock = get_socket(s);
+ if (!sock) {
+ return -1;
+ }
+
+ if (sock->conn->type != NETCONN_TCP) {
+#if (LWIP_UDP || LWIP_RAW)
+ return lwip_sendto(s, data, size, flags, NULL, 0);
+#else /* (LWIP_UDP || LWIP_RAW) */
+ sock_set_errno(sock, err_to_errno(ERR_ARG));
+ return -1;
+#endif /* (LWIP_UDP || LWIP_RAW) */
+ }
+
+ if ((flags & MSG_DONTWAIT) || netconn_is_nonblocking(sock->conn)) {
+ if ((size > TCP_SND_BUF) || ((size / TCP_MSS) > TCP_SND_QUEUELEN)) {
+ /* too much data to ever send nonblocking! */
+ sock_set_errno(sock, EMSGSIZE);
+ return -1;
+ }
+ }
+
+ write_flags = NETCONN_COPY |
+ ((flags & MSG_MORE) ? NETCONN_MORE : 0) |
+ ((flags & MSG_DONTWAIT) ? NETCONN_DONTBLOCK : 0);
+ err = netconn_write(sock->conn, data, size, write_flags);
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_send(%d) err=%d size=%"SZT_F"\n", s, err, size));
+ sock_set_errno(sock, err_to_errno(err));
+ return (err == ERR_OK ? (int)size : -1);
+}
+
+int
+lwip_sendto(int s, const void *data, size_t size, int flags,
+ const struct sockaddr *to, socklen_t tolen)
+{
+ struct lwip_sock *sock;
+ err_t err;
+ u16_t short_size;
+ const struct sockaddr_in *to_in;
+ u16_t remote_port;
+#if !LWIP_TCPIP_CORE_LOCKING
+ struct netbuf buf;
+#endif
+
+ sock = get_socket(s);
+ if (!sock) {
+ return -1;
+ }
+
+ if (sock->conn->type == NETCONN_TCP) {
+#if LWIP_TCP
+ return lwip_send(s, data, size, flags);
+#else /* LWIP_TCP */
+ LWIP_UNUSED_ARG(flags);
+ sock_set_errno(sock, err_to_errno(ERR_ARG));
+ return -1;
+#endif /* LWIP_TCP */
+ }
+
+ /* @todo: split into multiple sendto's? */
+ LWIP_ASSERT("lwip_sendto: size must fit in u16_t", size <= 0xffff);
+ short_size = (u16_t)size;
+ LWIP_ERROR("lwip_sendto: invalid address", (((to == NULL) && (tolen == 0)) ||
+ ((tolen == sizeof(struct sockaddr_in)) &&
+ ((to->sa_family) == AF_INET) && ((((mem_ptr_t)to) % 4) == 0))),
+ sock_set_errno(sock, err_to_errno(ERR_ARG)); return -1;);
+ to_in = (const struct sockaddr_in *)(void*)to;
+
+#if LWIP_TCPIP_CORE_LOCKING
+ /* Should only be consider like a sample or a simple way to experiment this option (no check of "to" field...) */
+ {
+ struct pbuf* p;
+ ip_addr_t *remote_addr;
+
+#if LWIP_NETIF_TX_SINGLE_PBUF
+ p = pbuf_alloc(PBUF_TRANSPORT, short_size, PBUF_RAM);
+ if (p != NULL) {
+#if LWIP_CHECKSUM_ON_COPY
+ u16_t chksum = 0;
+ if (sock->conn->type != NETCONN_RAW) {
+ chksum = LWIP_CHKSUM_COPY(p->payload, data, short_size);
+ } else
+#endif /* LWIP_CHECKSUM_ON_COPY */
+ MEMCPY(p->payload, data, size);
+#else /* LWIP_NETIF_TX_SINGLE_PBUF */
+ p = pbuf_alloc(PBUF_TRANSPORT, short_size, PBUF_REF);
+ if (p != NULL) {
+ p->payload = (void*)data;
+#endif /* LWIP_NETIF_TX_SINGLE_PBUF */
+
+ if (to_in != NULL) {
+ inet_addr_to_ipaddr_p(remote_addr, &to_in->sin_addr);
+ remote_port = ntohs(to_in->sin_port);
+ } else {
+ remote_addr = &sock->conn->pcb.raw->remote_ip;
+ if (sock->conn->type == NETCONN_RAW) {
+ remote_port = 0;
+ } else {
+ remote_port = sock->conn->pcb.udp->remote_port;
+ }
+ }
+
+ LOCK_TCPIP_CORE();
+ if (sock->conn->type == NETCONN_RAW) {
+ err = sock->conn->last_err = raw_sendto(sock->conn->pcb.raw, p, remote_addr);
+ } else {
+#if LWIP_UDP
+#if LWIP_CHECKSUM_ON_COPY && LWIP_NETIF_TX_SINGLE_PBUF
+ err = sock->conn->last_err = udp_sendto_chksum(sock->conn->pcb.udp, p,
+ remote_addr, remote_port, 1, chksum);
+#else /* LWIP_CHECKSUM_ON_COPY && LWIP_NETIF_TX_SINGLE_PBUF */
+ err = sock->conn->last_err = udp_sendto(sock->conn->pcb.udp, p,
+ remote_addr, remote_port);
+#endif /* LWIP_CHECKSUM_ON_COPY && LWIP_NETIF_TX_SINGLE_PBUF */
+#else /* LWIP_UDP */
+ err = ERR_ARG;
+#endif /* LWIP_UDP */
+ }
+ UNLOCK_TCPIP_CORE();
+
+ pbuf_free(p);
+ } else {
+ err = ERR_MEM;
+ }
+ }
+#else /* LWIP_TCPIP_CORE_LOCKING */
+ /* initialize a buffer */
+ buf.p = buf.ptr = NULL;
+#if LWIP_CHECKSUM_ON_COPY
+ buf.flags = 0;
+#endif /* LWIP_CHECKSUM_ON_COPY */
+ if (to) {
+ inet_addr_to_ipaddr(&buf.addr, &to_in->sin_addr);
+ remote_port = ntohs(to_in->sin_port);
+ netbuf_fromport(&buf) = remote_port;
+ } else {
+ remote_port = 0;
+ ip_addr_set_any(&buf.addr);
+ netbuf_fromport(&buf) = 0;
+ }
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_sendto(%d, data=%p, short_size=%"U16_F", flags=0x%x to=",
+ s, data, short_size, flags));
+ ip_addr_debug_print(SOCKETS_DEBUG, &buf.addr);
+ LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F"\n", remote_port));
+
+ /* make the buffer point to the data that should be sent */
+#if LWIP_NETIF_TX_SINGLE_PBUF
+ /* Allocate a new netbuf and copy the data into it. */
+ if (netbuf_alloc(&buf, short_size) == NULL) {
+ err = ERR_MEM;
+ } else {
+#if LWIP_CHECKSUM_ON_COPY
+ if (sock->conn->type != NETCONN_RAW) {
+ u16_t chksum = LWIP_CHKSUM_COPY(buf.p->payload, data, short_size);
+ netbuf_set_chksum(&buf, chksum);
+ err = ERR_OK;
+ } else
+#endif /* LWIP_CHECKSUM_ON_COPY */
+ {
+ err = netbuf_take(&buf, data, short_size);
+ }
+ }
+#else /* LWIP_NETIF_TX_SINGLE_PBUF */
+ err = netbuf_ref(&buf, data, short_size);
+#endif /* LWIP_NETIF_TX_SINGLE_PBUF */
+ if (err == ERR_OK) {
+ /* send the data */
+ err = netconn_send(sock->conn, &buf);
+ }
+
+ /* deallocated the buffer */
+ netbuf_free(&buf);
+#endif /* LWIP_TCPIP_CORE_LOCKING */
+ sock_set_errno(sock, err_to_errno(err));
+ return (err == ERR_OK ? short_size : -1);
+}
+
+int
+lwip_socket(int domain, int type, int protocol)
+{
+ struct netconn *conn;
+ int i;
+
+ LWIP_UNUSED_ARG(domain);
+
+ /* create a netconn */
+ switch (type) {
+ case SOCK_RAW:
+ conn = netconn_new_with_proto_and_callback(NETCONN_RAW, (u8_t)protocol, event_callback);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_socket(%s, SOCK_RAW, %d) = ",
+ domain == PF_INET ? "PF_INET" : "UNKNOWN", protocol));
+ break;
+ case SOCK_DGRAM:
+ conn = netconn_new_with_callback( (protocol == IPPROTO_UDPLITE) ?
+ NETCONN_UDPLITE : NETCONN_UDP, event_callback);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_socket(%s, SOCK_DGRAM, %d) = ",
+ domain == PF_INET ? "PF_INET" : "UNKNOWN", protocol));
+ break;
+ case SOCK_STREAM:
+ conn = netconn_new_with_callback(NETCONN_TCP, event_callback);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_socket(%s, SOCK_STREAM, %d) = ",
+ domain == PF_INET ? "PF_INET" : "UNKNOWN", protocol));
+ if (conn != NULL) {
+ /* Prevent automatic window updates, we do this on our own! */
+ netconn_set_noautorecved(conn, 1);
+ }
+ break;
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_socket(%d, %d/UNKNOWN, %d) = -1\n",
+ domain, type, protocol));
+ set_errno(EINVAL);
+ return -1;
+ }
+
+ if (!conn) {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("-1 / ENOBUFS (could not create netconn)\n"));
+ set_errno(ENOBUFS);
+ return -1;
+ }
+
+ i = alloc_socket(conn, 0);
+
+ if (i == -1) {
+ netconn_delete(conn);
+ set_errno(ENFILE);
+ return -1;
+ }
+ conn->socket = i;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("%d\n", i));
+ set_errno(0);
+ return i;
+}
+
+int
+lwip_write(int s, const void *data, size_t size)
+{
+ return lwip_send(s, data, size, 0);
+}
+
+/**
+ * Go through the readset and writeset lists and see which socket of the sockets
+ * set in the sets has events. On return, readset, writeset and exceptset have
+ * the sockets enabled that had events.
+ *
+ * exceptset is not used for now!!!
+ *
+ * @param maxfdp1 the highest socket index in the sets
+ * @param readset_in: set of sockets to check for read events
+ * @param writeset_in: set of sockets to check for write events
+ * @param exceptset_in: set of sockets to check for error events
+ * @param readset_out: set of sockets that had read events
+ * @param writeset_out: set of sockets that had write events
+ * @param exceptset_out: set os sockets that had error events
+ * @return number of sockets that had events (read/write/exception) (>= 0)
+ */
+static int
+lwip_selscan(int maxfdp1, fd_set *readset_in, fd_set *writeset_in, fd_set *exceptset_in,
+ fd_set *readset_out, fd_set *writeset_out, fd_set *exceptset_out)
+{
+ int i, nready = 0;
+ fd_set lreadset, lwriteset, lexceptset;
+ struct lwip_sock *sock;
+ SYS_ARCH_DECL_PROTECT(lev);
+
+ FD_ZERO(&lreadset);
+ FD_ZERO(&lwriteset);
+ FD_ZERO(&lexceptset);
+
+ /* Go through each socket in each list to count number of sockets which
+ currently match */
+ for(i = 0; i < maxfdp1; i++) {
+ void* lastdata = NULL;
+ s16_t rcvevent = 0;
+ u16_t sendevent = 0;
+ u16_t errevent = 0;
+ /* First get the socket's status (protected)... */
+ SYS_ARCH_PROTECT(lev);
+ sock = tryget_socket(i);
+ if (sock != NULL) {
+ lastdata = sock->lastdata;
+ rcvevent = sock->rcvevent;
+ sendevent = sock->sendevent;
+ errevent = sock->errevent;
+ }
+ SYS_ARCH_UNPROTECT(lev);
+ /* ... then examine it: */
+ /* See if netconn of this socket is ready for read */
+ if (readset_in && FD_ISSET(i, readset_in) && ((lastdata != NULL) || (rcvevent > 0))) {
+ FD_SET(i, &lreadset);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_selscan: fd=%d ready for reading\n", i));
+ nready++;
+ }
+ /* See if netconn of this socket is ready for write */
+ if (writeset_in && FD_ISSET(i, writeset_in) && (sendevent != 0)) {
+ FD_SET(i, &lwriteset);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_selscan: fd=%d ready for writing\n", i));
+ nready++;
+ }
+ /* See if netconn of this socket had an error */
+ if (exceptset_in && FD_ISSET(i, exceptset_in) && (errevent != 0)) {
+ FD_SET(i, &lexceptset);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_selscan: fd=%d ready for exception\n", i));
+ nready++;
+ }
+ }
+ /* copy local sets to the ones provided as arguments */
+ *readset_out = lreadset;
+ *writeset_out = lwriteset;
+ *exceptset_out = lexceptset;
+
+ LWIP_ASSERT("nready >= 0", nready >= 0);
+ return nready;
+}
+
+/**
+ * Processing exceptset is not yet implemented.
+ */
+int
+lwip_select(int maxfdp1, fd_set *readset, fd_set *writeset, fd_set *exceptset,
+ struct timeval *timeout)
+{
+ u32_t waitres = 0;
+ int nready;
+ fd_set lreadset, lwriteset, lexceptset;
+ u32_t msectimeout;
+ struct lwip_select_cb select_cb;
+ err_t err;
+ int i;
+ SYS_ARCH_DECL_PROTECT(lev);
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_select(%d, %p, %p, %p, tvsec=%"S32_F" tvusec=%"S32_F")\n",
+ maxfdp1, (void *)readset, (void *) writeset, (void *) exceptset,
+ timeout ? (s32_t)timeout->tv_sec : (s32_t)-1,
+ timeout ? (s32_t)timeout->tv_usec : (s32_t)-1));
+
+ /* Go through each socket in each list to count number of sockets which
+ currently match */
+ nready = lwip_selscan(maxfdp1, readset, writeset, exceptset, &lreadset, &lwriteset, &lexceptset);
+
+ /* If we don't have any current events, then suspend if we are supposed to */
+ if (!nready) {
+ if (timeout && timeout->tv_sec == 0 && timeout->tv_usec == 0) {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_select: no timeout, returning 0\n"));
+ /* This is OK as the local fdsets are empty and nready is zero,
+ or we would have returned earlier. */
+ goto return_copy_fdsets;
+ }
+
+ /* None ready: add our semaphore to list:
+ We don't actually need any dynamic memory. Our entry on the
+ list is only valid while we are in this function, so it's ok
+ to use local variables. */
+
+ select_cb.next = NULL;
+ select_cb.prev = NULL;
+ select_cb.readset = readset;
+ select_cb.writeset = writeset;
+ select_cb.exceptset = exceptset;
+ select_cb.sem_signalled = 0;
+ err = sys_sem_new(&select_cb.sem, 0);
+ if (err != ERR_OK) {
+ /* failed to create semaphore */
+ set_errno(ENOMEM);
+ return -1;
+ }
+
+ /* Protect the select_cb_list */
+ SYS_ARCH_PROTECT(lev);
+
+ /* Put this select_cb on top of list */
+ select_cb.next = select_cb_list;
+ if (select_cb_list != NULL) {
+ select_cb_list->prev = &select_cb;
+ }
+ select_cb_list = &select_cb;
+ /* Increasing this counter tells even_callback that the list has changed. */
+ select_cb_ctr++;
+
+ /* Now we can safely unprotect */
+ SYS_ARCH_UNPROTECT(lev);
+
+ /* Increase select_waiting for each socket we are interested in */
+ for(i = 0; i < maxfdp1; i++) {
+ if ((readset && FD_ISSET(i, readset)) ||
+ (writeset && FD_ISSET(i, writeset)) ||
+ (exceptset && FD_ISSET(i, exceptset))) {
+ struct lwip_sock *sock = tryget_socket(i);
+ LWIP_ASSERT("sock != NULL", sock != NULL);
+ SYS_ARCH_PROTECT(lev);
+ sock->select_waiting++;
+ LWIP_ASSERT("sock->select_waiting > 0", sock->select_waiting > 0);
+ SYS_ARCH_UNPROTECT(lev);
+ }
+ }
+
+ /* Call lwip_selscan again: there could have been events between
+ the last scan (whithout us on the list) and putting us on the list! */
+ nready = lwip_selscan(maxfdp1, readset, writeset, exceptset, &lreadset, &lwriteset, &lexceptset);
+ if (!nready) {
+ /* Still none ready, just wait to be woken */
+ if (timeout == 0) {
+ /* Wait forever */
+ msectimeout = 0;
+ } else {
+ msectimeout = ((timeout->tv_sec * 1000) + ((timeout->tv_usec + 500)/1000));
+ if (msectimeout == 0) {
+ /* Wait 1ms at least (0 means wait forever) */
+ msectimeout = 1;
+ }
+ }
+
+ waitres = sys_arch_sem_wait(&select_cb.sem, msectimeout);
+ }
+ /* Increase select_waiting for each socket we are interested in */
+ for(i = 0; i < maxfdp1; i++) {
+ if ((readset && FD_ISSET(i, readset)) ||
+ (writeset && FD_ISSET(i, writeset)) ||
+ (exceptset && FD_ISSET(i, exceptset))) {
+ struct lwip_sock *sock = tryget_socket(i);
+ LWIP_ASSERT("sock != NULL", sock != NULL);
+ SYS_ARCH_PROTECT(lev);
+ sock->select_waiting--;
+ LWIP_ASSERT("sock->select_waiting >= 0", sock->select_waiting >= 0);
+ SYS_ARCH_UNPROTECT(lev);
+ }
+ }
+ /* Take us off the list */
+ SYS_ARCH_PROTECT(lev);
+ if (select_cb.next != NULL) {
+ select_cb.next->prev = select_cb.prev;
+ }
+ if (select_cb_list == &select_cb) {
+ LWIP_ASSERT("select_cb.prev == NULL", select_cb.prev == NULL);
+ select_cb_list = select_cb.next;
+ } else {
+ LWIP_ASSERT("select_cb.prev != NULL", select_cb.prev != NULL);
+ select_cb.prev->next = select_cb.next;
+ }
+ /* Increasing this counter tells even_callback that the list has changed. */
+ select_cb_ctr++;
+ SYS_ARCH_UNPROTECT(lev);
+
+ sys_sem_free(&select_cb.sem);
+ if (waitres == SYS_ARCH_TIMEOUT) {
+ /* Timeout */
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_select: timeout expired\n"));
+ /* This is OK as the local fdsets are empty and nready is zero,
+ or we would have returned earlier. */
+ goto return_copy_fdsets;
+ }
+
+ /* See what's set */
+ nready = lwip_selscan(maxfdp1, readset, writeset, exceptset, &lreadset, &lwriteset, &lexceptset);
+ }
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_select: nready=%d\n", nready));
+return_copy_fdsets:
+ set_errno(0);
+ if (readset) {
+ *readset = lreadset;
+ }
+ if (writeset) {
+ *writeset = lwriteset;
+ }
+ if (exceptset) {
+ *exceptset = lexceptset;
+ }
+
+
+ return nready;
+}
+
+/**
+ * Callback registered in the netconn layer for each socket-netconn.
+ * Processes recvevent (data available) and wakes up tasks waiting for select.
+ */
+static void
+event_callback(struct netconn *conn, enum netconn_evt evt, u16_t len)
+{
+ int s;
+ struct lwip_sock *sock;
+ struct lwip_select_cb *scb;
+ int last_select_cb_ctr;
+ SYS_ARCH_DECL_PROTECT(lev);
+
+ LWIP_UNUSED_ARG(len);
+
+ /* Get socket */
+ if (conn) {
+ s = conn->socket;
+ if (s < 0) {
+ /* Data comes in right away after an accept, even though
+ * the server task might not have created a new socket yet.
+ * Just count down (or up) if that's the case and we
+ * will use the data later. Note that only receive events
+ * can happen before the new socket is set up. */
+ SYS_ARCH_PROTECT(lev);
+ if (conn->socket < 0) {
+ if (evt == NETCONN_EVT_RCVPLUS) {
+ conn->socket--;
+ }
+ SYS_ARCH_UNPROTECT(lev);
+ return;
+ }
+ s = conn->socket;
+ SYS_ARCH_UNPROTECT(lev);
+ }
+
+ sock = get_socket(s);
+ if (!sock) {
+ return;
+ }
+ } else {
+ return;
+ }
+
+ SYS_ARCH_PROTECT(lev);
+ /* Set event as required */
+ switch (evt) {
+ case NETCONN_EVT_RCVPLUS:
+ sock->rcvevent++;
+ break;
+ case NETCONN_EVT_RCVMINUS:
+ sock->rcvevent--;
+ break;
+ case NETCONN_EVT_SENDPLUS:
+ sock->sendevent = 1;
+ break;
+ case NETCONN_EVT_SENDMINUS:
+ sock->sendevent = 0;
+ break;
+ case NETCONN_EVT_ERROR:
+ sock->errevent = 1;
+ break;
+ default:
+ LWIP_ASSERT("unknown event", 0);
+ break;
+ }
+
+ if (sock->select_waiting == 0) {
+ /* noone is waiting for this socket, no need to check select_cb_list */
+ SYS_ARCH_UNPROTECT(lev);
+ return;
+ }
+
+ /* Now decide if anyone is waiting for this socket */
+ /* NOTE: This code goes through the select_cb_list list multiple times
+ ONLY IF a select was actually waiting. We go through the list the number
+ of waiting select calls + 1. This list is expected to be small. */
+
+ /* At this point, SYS_ARCH is still protected! */
+again:
+ for (scb = select_cb_list; scb != NULL; scb = scb->next) {
+ if (scb->sem_signalled == 0) {
+ /* semaphore not signalled yet */
+ int do_signal = 0;
+ /* Test this select call for our socket */
+ if (sock->rcvevent > 0) {
+ if (scb->readset && FD_ISSET(s, scb->readset)) {
+ do_signal = 1;
+ }
+ }
+ if (sock->sendevent != 0) {
+ if (!do_signal && scb->writeset && FD_ISSET(s, scb->writeset)) {
+ do_signal = 1;
+ }
+ }
+ if (sock->errevent != 0) {
+ if (!do_signal && scb->exceptset && FD_ISSET(s, scb->exceptset)) {
+ do_signal = 1;
+ }
+ }
+ if (do_signal) {
+ scb->sem_signalled = 1;
+ /* Don't call SYS_ARCH_UNPROTECT() before signaling the semaphore, as this might
+ lead to the select thread taking itself off the list, invalidagin the semaphore. */
+ sys_sem_signal(&scb->sem);
+ }
+ }
+ /* unlock interrupts with each step */
+ last_select_cb_ctr = select_cb_ctr;
+ SYS_ARCH_UNPROTECT(lev);
+ /* this makes sure interrupt protection time is short */
+ SYS_ARCH_PROTECT(lev);
+ if (last_select_cb_ctr != select_cb_ctr) {
+ /* someone has changed select_cb_list, restart at the beginning */
+ goto again;
+ }
+ }
+ SYS_ARCH_UNPROTECT(lev);
+}
+
+/**
+ * Unimplemented: Close one end of a full-duplex connection.
+ * Currently, the full connection is closed.
+ */
+int
+lwip_shutdown(int s, int how)
+{
+ struct lwip_sock *sock;
+ err_t err;
+ u8_t shut_rx = 0, shut_tx = 0;
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_shutdown(%d, how=%d)\n", s, how));
+
+ sock = get_socket(s);
+ if (!sock) {
+ return -1;
+ }
+
+ if (sock->conn != NULL) {
+ if (netconn_type(sock->conn) != NETCONN_TCP) {
+ sock_set_errno(sock, EOPNOTSUPP);
+ return EOPNOTSUPP;
+ }
+ } else {
+ sock_set_errno(sock, ENOTCONN);
+ return ENOTCONN;
+ }
+
+ if (how == SHUT_RD) {
+ shut_rx = 1;
+ } else if (how == SHUT_WR) {
+ shut_tx = 1;
+ } else if(how == SHUT_RDWR) {
+ shut_rx = 1;
+ shut_tx = 1;
+ } else {
+ sock_set_errno(sock, EINVAL);
+ return EINVAL;
+ }
+ err = netconn_shutdown(sock->conn, shut_rx, shut_tx);
+
+ sock_set_errno(sock, err_to_errno(err));
+ return (err == ERR_OK ? 0 : -1);
+}
+
+static int
+lwip_getaddrname(int s, struct sockaddr *name, socklen_t *namelen, u8_t local)
+{
+ struct lwip_sock *sock;
+ struct sockaddr_in sin;
+ ip_addr_t naddr;
+
+ sock = get_socket(s);
+ if (!sock) {
+ return -1;
+ }
+
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_len = sizeof(sin);
+ sin.sin_family = AF_INET;
+
+ /* get the IP address and port */
+ netconn_getaddr(sock->conn, &naddr, &sin.sin_port, local);
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getaddrname(%d, addr=", s));
+ ip_addr_debug_print(SOCKETS_DEBUG, &naddr);
+ LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F")\n", sin.sin_port));
+
+ sin.sin_port = htons(sin.sin_port);
+ inet_addr_from_ipaddr(&sin.sin_addr, &naddr);
+
+ if (*namelen > sizeof(sin)) {
+ *namelen = sizeof(sin);
+ }
+
+ MEMCPY(name, &sin, *namelen);
+ sock_set_errno(sock, 0);
+ return 0;
+}
+
+int
+lwip_getpeername(int s, struct sockaddr *name, socklen_t *namelen)
+{
+ return lwip_getaddrname(s, name, namelen, 0);
+}
+
+int
+lwip_getsockname(int s, struct sockaddr *name, socklen_t *namelen)
+{
+ return lwip_getaddrname(s, name, namelen, 1);
+}
+
+int
+lwip_getsockopt(int s, int level, int optname, void *optval, socklen_t *optlen)
+{
+ err_t err = ERR_OK;
+ struct lwip_sock *sock = get_socket(s);
+ struct lwip_setgetsockopt_data data;
+
+ if (!sock) {
+ return -1;
+ }
+
+ if ((NULL == optval) || (NULL == optlen)) {
+ sock_set_errno(sock, EFAULT);
+ return -1;
+ }
+
+ /* Do length and type checks for the various options first, to keep it readable. */
+ switch (level) {
+
+/* Level: SOL_SOCKET */
+ case SOL_SOCKET:
+ switch (optname) {
+
+ case SO_ACCEPTCONN:
+ case SO_BROADCAST:
+ /* UNIMPL case SO_DEBUG: */
+ /* UNIMPL case SO_DONTROUTE: */
+ case SO_ERROR:
+ case SO_KEEPALIVE:
+ /* UNIMPL case SO_CONTIMEO: */
+ /* UNIMPL case SO_SNDTIMEO: */
+#if LWIP_SO_RCVTIMEO
+ case SO_RCVTIMEO:
+#endif /* LWIP_SO_RCVTIMEO */
+#if LWIP_SO_RCVBUF
+ case SO_RCVBUF:
+#endif /* LWIP_SO_RCVBUF */
+ /* UNIMPL case SO_OOBINLINE: */
+ /* UNIMPL case SO_SNDBUF: */
+ /* UNIMPL case SO_RCVLOWAT: */
+ /* UNIMPL case SO_SNDLOWAT: */
+#if SO_REUSE
+ case SO_REUSEADDR:
+ case SO_REUSEPORT:
+#endif /* SO_REUSE */
+ case SO_TYPE:
+ /* UNIMPL case SO_USELOOPBACK: */
+ if (*optlen < sizeof(int)) {
+ err = EINVAL;
+ }
+ break;
+
+ case SO_NO_CHECK:
+ if (*optlen < sizeof(int)) {
+ err = EINVAL;
+ }
+#if LWIP_UDP
+ if ((sock->conn->type != NETCONN_UDP) ||
+ ((udp_flags(sock->conn->pcb.udp) & UDP_FLAGS_UDPLITE) != 0)) {
+ /* this flag is only available for UDP, not for UDP lite */
+ err = EAFNOSUPPORT;
+ }
+#endif /* LWIP_UDP */
+ break;
+
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, SOL_SOCKET, UNIMPL: optname=0x%x, ..)\n",
+ s, optname));
+ err = ENOPROTOOPT;
+ } /* switch (optname) */
+ break;
+
+/* Level: IPPROTO_IP */
+ case IPPROTO_IP:
+ switch (optname) {
+ /* UNIMPL case IP_HDRINCL: */
+ /* UNIMPL case IP_RCVDSTADDR: */
+ /* UNIMPL case IP_RCVIF: */
+ case IP_TTL:
+ case IP_TOS:
+ if (*optlen < sizeof(int)) {
+ err = EINVAL;
+ }
+ break;
+#if LWIP_IGMP
+ case IP_MULTICAST_TTL:
+ if (*optlen < sizeof(u8_t)) {
+ err = EINVAL;
+ }
+ break;
+ case IP_MULTICAST_IF:
+ if (*optlen < sizeof(struct in_addr)) {
+ err = EINVAL;
+ }
+ break;
+ case IP_MULTICAST_LOOP:
+ if (*optlen < sizeof(u8_t)) {
+ err = EINVAL;
+ }
+ if (NETCONNTYPE_GROUP(sock->conn->type) != NETCONN_UDP) {
+ err = EAFNOSUPPORT;
+ }
+ break;
+#endif /* LWIP_IGMP */
+
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, UNIMPL: optname=0x%x, ..)\n",
+ s, optname));
+ err = ENOPROTOOPT;
+ } /* switch (optname) */
+ break;
+
+#if LWIP_TCP
+/* Level: IPPROTO_TCP */
+ case IPPROTO_TCP:
+ if (*optlen < sizeof(int)) {
+ err = EINVAL;
+ break;
+ }
+
+ /* If this is no TCP socket, ignore any options. */
+ if (sock->conn->type != NETCONN_TCP)
+ return 0;
+
+ switch (optname) {
+ case TCP_NODELAY:
+ case TCP_KEEPALIVE:
+#if LWIP_TCP_KEEPALIVE
+ case TCP_KEEPIDLE:
+ case TCP_KEEPINTVL:
+ case TCP_KEEPCNT:
+#endif /* LWIP_TCP_KEEPALIVE */
+ break;
+
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_TCP, UNIMPL: optname=0x%x, ..)\n",
+ s, optname));
+ err = ENOPROTOOPT;
+ } /* switch (optname) */
+ break;
+#endif /* LWIP_TCP */
+#if LWIP_UDP && LWIP_UDPLITE
+/* Level: IPPROTO_UDPLITE */
+ case IPPROTO_UDPLITE:
+ if (*optlen < sizeof(int)) {
+ err = EINVAL;
+ break;
+ }
+
+ /* If this is no UDP lite socket, ignore any options. */
+ if (sock->conn->type != NETCONN_UDPLITE) {
+ return 0;
+ }
+
+ switch (optname) {
+ case UDPLITE_SEND_CSCOV:
+ case UDPLITE_RECV_CSCOV:
+ break;
+
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_UDPLITE, UNIMPL: optname=0x%x, ..)\n",
+ s, optname));
+ err = ENOPROTOOPT;
+ } /* switch (optname) */
+ break;
+#endif /* LWIP_UDP && LWIP_UDPLITE*/
+/* UNDEFINED LEVEL */
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, level=0x%x, UNIMPL: optname=0x%x, ..)\n",
+ s, level, optname));
+ err = ENOPROTOOPT;
+ } /* switch */
+
+
+ if (err != ERR_OK) {
+ sock_set_errno(sock, err);
+ return -1;
+ }
+
+ /* Now do the actual option processing */
+ data.sock = sock;
+#ifdef LWIP_DEBUG
+ data.s = s;
+#endif /* LWIP_DEBUG */
+ data.level = level;
+ data.optname = optname;
+ data.optval = optval;
+ data.optlen = optlen;
+ data.err = err;
+ tcpip_callback(lwip_getsockopt_internal, &data);
+ sys_arch_sem_wait(&sock->conn->op_completed, 0);
+ /* maybe lwip_getsockopt_internal has changed err */
+ err = data.err;
+
+ sock_set_errno(sock, err);
+ return err ? -1 : 0;
+}
+
+static void
+lwip_getsockopt_internal(void *arg)
+{
+ struct lwip_sock *sock;
+#ifdef LWIP_DEBUG
+ int s;
+#endif /* LWIP_DEBUG */
+ int level, optname;
+ void *optval;
+ struct lwip_setgetsockopt_data *data;
+
+ LWIP_ASSERT("arg != NULL", arg != NULL);
+
+ data = (struct lwip_setgetsockopt_data*)arg;
+ sock = data->sock;
+#ifdef LWIP_DEBUG
+ s = data->s;
+#endif /* LWIP_DEBUG */
+ level = data->level;
+ optname = data->optname;
+ optval = data->optval;
+
+ switch (level) {
+
+/* Level: SOL_SOCKET */
+ case SOL_SOCKET:
+ switch (optname) {
+
+ /* The option flags */
+ case SO_ACCEPTCONN:
+ case SO_BROADCAST:
+ /* UNIMPL case SO_DEBUG: */
+ /* UNIMPL case SO_DONTROUTE: */
+ case SO_KEEPALIVE:
+ /* UNIMPL case SO_OOBINCLUDE: */
+#if SO_REUSE
+ case SO_REUSEADDR:
+ case SO_REUSEPORT:
+#endif /* SO_REUSE */
+ /*case SO_USELOOPBACK: UNIMPL */
+ *(int*)optval = sock->conn->pcb.ip->so_options & optname;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, SOL_SOCKET, optname=0x%x, ..) = %s\n",
+ s, optname, (*(int*)optval?"on":"off")));
+ break;
+
+ case SO_TYPE:
+ switch (NETCONNTYPE_GROUP(sock->conn->type)) {
+ case NETCONN_RAW:
+ *(int*)optval = SOCK_RAW;
+ break;
+ case NETCONN_TCP:
+ *(int*)optval = SOCK_STREAM;
+ break;
+ case NETCONN_UDP:
+ *(int*)optval = SOCK_DGRAM;
+ break;
+ default: /* unrecognized socket type */
+ *(int*)optval = sock->conn->type;
+ LWIP_DEBUGF(SOCKETS_DEBUG,
+ ("lwip_getsockopt(%d, SOL_SOCKET, SO_TYPE): unrecognized socket type %d\n",
+ s, *(int *)optval));
+ } /* switch (sock->conn->type) */
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, SOL_SOCKET, SO_TYPE) = %d\n",
+ s, *(int *)optval));
+ break;
+
+ case SO_ERROR:
+ /* only overwrite ERR_OK or tempoary errors */
+ if ((sock->err == 0) || (sock->err == EINPROGRESS)) {
+ sock_set_errno(sock, err_to_errno(sock->conn->last_err));
+ }
+ *(int *)optval = sock->err;
+ sock->err = 0;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, SOL_SOCKET, SO_ERROR) = %d\n",
+ s, *(int *)optval));
+ break;
+
+#if LWIP_SO_RCVTIMEO
+ case SO_RCVTIMEO:
+ *(int *)optval = netconn_get_recvtimeout(sock->conn);
+ break;
+#endif /* LWIP_SO_RCVTIMEO */
+#if LWIP_SO_RCVBUF
+ case SO_RCVBUF:
+ *(int *)optval = netconn_get_recvbufsize(sock->conn);
+ break;
+#endif /* LWIP_SO_RCVBUF */
+#if LWIP_UDP
+ case SO_NO_CHECK:
+ *(int*)optval = (udp_flags(sock->conn->pcb.udp) & UDP_FLAGS_NOCHKSUM) ? 1 : 0;
+ break;
+#endif /* LWIP_UDP*/
+ default:
+ LWIP_ASSERT("unhandled optname", 0);
+ break;
+ } /* switch (optname) */
+ break;
+
+/* Level: IPPROTO_IP */
+ case IPPROTO_IP:
+ switch (optname) {
+ case IP_TTL:
+ *(int*)optval = sock->conn->pcb.ip->ttl;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, IP_TTL) = %d\n",
+ s, *(int *)optval));
+ break;
+ case IP_TOS:
+ *(int*)optval = sock->conn->pcb.ip->tos;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, IP_TOS) = %d\n",
+ s, *(int *)optval));
+ break;
+#if LWIP_IGMP
+ case IP_MULTICAST_TTL:
+ *(u8_t*)optval = sock->conn->pcb.ip->ttl;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, IP_MULTICAST_TTL) = %d\n",
+ s, *(int *)optval));
+ break;
+ case IP_MULTICAST_IF:
+ inet_addr_from_ipaddr((struct in_addr*)optval, &sock->conn->pcb.udp->multicast_ip);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, IP_MULTICAST_IF) = 0x%"X32_F"\n",
+ s, *(u32_t *)optval));
+ break;
+ case IP_MULTICAST_LOOP:
+ if ((sock->conn->pcb.udp->flags & UDP_FLAGS_MULTICAST_LOOP) != 0) {
+ *(u8_t*)optval = 1;
+ } else {
+ *(u8_t*)optval = 0;
+ }
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, IP_MULTICAST_LOOP) = %d\n",
+ s, *(int *)optval));
+ break;
+#endif /* LWIP_IGMP */
+ default:
+ LWIP_ASSERT("unhandled optname", 0);
+ break;
+ } /* switch (optname) */
+ break;
+
+#if LWIP_TCP
+/* Level: IPPROTO_TCP */
+ case IPPROTO_TCP:
+ switch (optname) {
+ case TCP_NODELAY:
+ *(int*)optval = tcp_nagle_disabled(sock->conn->pcb.tcp);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_TCP, TCP_NODELAY) = %s\n",
+ s, (*(int*)optval)?"on":"off") );
+ break;
+ case TCP_KEEPALIVE:
+ *(int*)optval = (int)sock->conn->pcb.tcp->keep_idle;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, TCP_KEEPALIVE) = %d\n",
+ s, *(int *)optval));
+ break;
+
+#if LWIP_TCP_KEEPALIVE
+ case TCP_KEEPIDLE:
+ *(int*)optval = (int)(sock->conn->pcb.tcp->keep_idle/1000);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, TCP_KEEPIDLE) = %d\n",
+ s, *(int *)optval));
+ break;
+ case TCP_KEEPINTVL:
+ *(int*)optval = (int)(sock->conn->pcb.tcp->keep_intvl/1000);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, TCP_KEEPINTVL) = %d\n",
+ s, *(int *)optval));
+ break;
+ case TCP_KEEPCNT:
+ *(int*)optval = (int)sock->conn->pcb.tcp->keep_cnt;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, TCP_KEEPCNT) = %d\n",
+ s, *(int *)optval));
+ break;
+#endif /* LWIP_TCP_KEEPALIVE */
+ default:
+ LWIP_ASSERT("unhandled optname", 0);
+ break;
+ } /* switch (optname) */
+ break;
+#endif /* LWIP_TCP */
+#if LWIP_UDP && LWIP_UDPLITE
+ /* Level: IPPROTO_UDPLITE */
+ case IPPROTO_UDPLITE:
+ switch (optname) {
+ case UDPLITE_SEND_CSCOV:
+ *(int*)optval = sock->conn->pcb.udp->chksum_len_tx;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_UDPLITE, UDPLITE_SEND_CSCOV) = %d\n",
+ s, (*(int*)optval)) );
+ break;
+ case UDPLITE_RECV_CSCOV:
+ *(int*)optval = sock->conn->pcb.udp->chksum_len_rx;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_UDPLITE, UDPLITE_RECV_CSCOV) = %d\n",
+ s, (*(int*)optval)) );
+ break;
+ default:
+ LWIP_ASSERT("unhandled optname", 0);
+ break;
+ } /* switch (optname) */
+ break;
+#endif /* LWIP_UDP */
+ default:
+ LWIP_ASSERT("unhandled level", 0);
+ break;
+ } /* switch (level) */
+ sys_sem_signal(&sock->conn->op_completed);
+}
+
+int
+lwip_setsockopt(int s, int level, int optname, const void *optval, socklen_t optlen)
+{
+ struct lwip_sock *sock = get_socket(s);
+ err_t err = ERR_OK;
+ struct lwip_setgetsockopt_data data;
+
+ if (!sock) {
+ return -1;
+ }
+
+ if (NULL == optval) {
+ sock_set_errno(sock, EFAULT);
+ return -1;
+ }
+
+ /* Do length and type checks for the various options first, to keep it readable. */
+ switch (level) {
+
+/* Level: SOL_SOCKET */
+ case SOL_SOCKET:
+ switch (optname) {
+
+ case SO_BROADCAST:
+ /* UNIMPL case SO_DEBUG: */
+ /* UNIMPL case SO_DONTROUTE: */
+ case SO_KEEPALIVE:
+ /* UNIMPL case case SO_CONTIMEO: */
+ /* UNIMPL case case SO_SNDTIMEO: */
+#if LWIP_SO_RCVTIMEO
+ case SO_RCVTIMEO:
+#endif /* LWIP_SO_RCVTIMEO */
+#if LWIP_SO_RCVBUF
+ case SO_RCVBUF:
+#endif /* LWIP_SO_RCVBUF */
+ /* UNIMPL case SO_OOBINLINE: */
+ /* UNIMPL case SO_SNDBUF: */
+ /* UNIMPL case SO_RCVLOWAT: */
+ /* UNIMPL case SO_SNDLOWAT: */
+#if SO_REUSE
+ case SO_REUSEADDR:
+ case SO_REUSEPORT:
+#endif /* SO_REUSE */
+ /* UNIMPL case SO_USELOOPBACK: */
+ if (optlen < sizeof(int)) {
+ err = EINVAL;
+ }
+ break;
+ case SO_NO_CHECK:
+ if (optlen < sizeof(int)) {
+ err = EINVAL;
+ }
+#if LWIP_UDP
+ if ((sock->conn->type != NETCONN_UDP) ||
+ ((udp_flags(sock->conn->pcb.udp) & UDP_FLAGS_UDPLITE) != 0)) {
+ /* this flag is only available for UDP, not for UDP lite */
+ err = EAFNOSUPPORT;
+ }
+#endif /* LWIP_UDP */
+ break;
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, SOL_SOCKET, UNIMPL: optname=0x%x, ..)\n",
+ s, optname));
+ err = ENOPROTOOPT;
+ } /* switch (optname) */
+ break;
+
+/* Level: IPPROTO_IP */
+ case IPPROTO_IP:
+ switch (optname) {
+ /* UNIMPL case IP_HDRINCL: */
+ /* UNIMPL case IP_RCVDSTADDR: */
+ /* UNIMPL case IP_RCVIF: */
+ case IP_TTL:
+ case IP_TOS:
+ if (optlen < sizeof(int)) {
+ err = EINVAL;
+ }
+ break;
+#if LWIP_IGMP
+ case IP_MULTICAST_TTL:
+ if (optlen < sizeof(u8_t)) {
+ err = EINVAL;
+ }
+ if (NETCONNTYPE_GROUP(sock->conn->type) != NETCONN_UDP) {
+ err = EAFNOSUPPORT;
+ }
+ break;
+ case IP_MULTICAST_IF:
+ if (optlen < sizeof(struct in_addr)) {
+ err = EINVAL;
+ }
+ if (NETCONNTYPE_GROUP(sock->conn->type) != NETCONN_UDP) {
+ err = EAFNOSUPPORT;
+ }
+ break;
+ case IP_MULTICAST_LOOP:
+ if (optlen < sizeof(u8_t)) {
+ err = EINVAL;
+ }
+ if (NETCONNTYPE_GROUP(sock->conn->type) != NETCONN_UDP) {
+ err = EAFNOSUPPORT;
+ }
+ break;
+ case IP_ADD_MEMBERSHIP:
+ case IP_DROP_MEMBERSHIP:
+ if (optlen < sizeof(struct ip_mreq)) {
+ err = EINVAL;
+ }
+ if (NETCONNTYPE_GROUP(sock->conn->type) != NETCONN_UDP) {
+ err = EAFNOSUPPORT;
+ }
+ break;
+#endif /* LWIP_IGMP */
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_IP, UNIMPL: optname=0x%x, ..)\n",
+ s, optname));
+ err = ENOPROTOOPT;
+ } /* switch (optname) */
+ break;
+
+#if LWIP_TCP
+/* Level: IPPROTO_TCP */
+ case IPPROTO_TCP:
+ if (optlen < sizeof(int)) {
+ err = EINVAL;
+ break;
+ }
+
+ /* If this is no TCP socket, ignore any options. */
+ if (sock->conn->type != NETCONN_TCP)
+ return 0;
+
+ switch (optname) {
+ case TCP_NODELAY:
+ case TCP_KEEPALIVE:
+#if LWIP_TCP_KEEPALIVE
+ case TCP_KEEPIDLE:
+ case TCP_KEEPINTVL:
+ case TCP_KEEPCNT:
+#endif /* LWIP_TCP_KEEPALIVE */
+ break;
+
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, UNIMPL: optname=0x%x, ..)\n",
+ s, optname));
+ err = ENOPROTOOPT;
+ } /* switch (optname) */
+ break;
+#endif /* LWIP_TCP */
+#if LWIP_UDP && LWIP_UDPLITE
+/* Level: IPPROTO_UDPLITE */
+ case IPPROTO_UDPLITE:
+ if (optlen < sizeof(int)) {
+ err = EINVAL;
+ break;
+ }
+
+ /* If this is no UDP lite socket, ignore any options. */
+ if (sock->conn->type != NETCONN_UDPLITE)
+ return 0;
+
+ switch (optname) {
+ case UDPLITE_SEND_CSCOV:
+ case UDPLITE_RECV_CSCOV:
+ break;
+
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_UDPLITE, UNIMPL: optname=0x%x, ..)\n",
+ s, optname));
+ err = ENOPROTOOPT;
+ } /* switch (optname) */
+ break;
+#endif /* LWIP_UDP && LWIP_UDPLITE */
+/* UNDEFINED LEVEL */
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, level=0x%x, UNIMPL: optname=0x%x, ..)\n",
+ s, level, optname));
+ err = ENOPROTOOPT;
+ } /* switch (level) */
+
+
+ if (err != ERR_OK) {
+ sock_set_errno(sock, err);
+ return -1;
+ }
+
+
+ /* Now do the actual option processing */
+ data.sock = sock;
+#ifdef LWIP_DEBUG
+ data.s = s;
+#endif /* LWIP_DEBUG */
+ data.level = level;
+ data.optname = optname;
+ data.optval = (void*)optval;
+ data.optlen = &optlen;
+ data.err = err;
+ tcpip_callback(lwip_setsockopt_internal, &data);
+ sys_arch_sem_wait(&sock->conn->op_completed, 0);
+ /* maybe lwip_setsockopt_internal has changed err */
+ err = data.err;
+
+ sock_set_errno(sock, err);
+ return err ? -1 : 0;
+}
+
+static void
+lwip_setsockopt_internal(void *arg)
+{
+ struct lwip_sock *sock;
+#ifdef LWIP_DEBUG
+ int s;
+#endif /* LWIP_DEBUG */
+ int level, optname;
+ const void *optval;
+ struct lwip_setgetsockopt_data *data;
+
+ LWIP_ASSERT("arg != NULL", arg != NULL);
+
+ data = (struct lwip_setgetsockopt_data*)arg;
+ sock = data->sock;
+#ifdef LWIP_DEBUG
+ s = data->s;
+#endif /* LWIP_DEBUG */
+ level = data->level;
+ optname = data->optname;
+ optval = data->optval;
+
+ switch (level) {
+
+/* Level: SOL_SOCKET */
+ case SOL_SOCKET:
+ switch (optname) {
+
+ /* The option flags */
+ case SO_BROADCAST:
+ /* UNIMPL case SO_DEBUG: */
+ /* UNIMPL case SO_DONTROUTE: */
+ case SO_KEEPALIVE:
+ /* UNIMPL case SO_OOBINCLUDE: */
+#if SO_REUSE
+ case SO_REUSEADDR:
+ case SO_REUSEPORT:
+#endif /* SO_REUSE */
+ /* UNIMPL case SO_USELOOPBACK: */
+ if (*(int*)optval) {
+ sock->conn->pcb.ip->so_options |= optname;
+ } else {
+ sock->conn->pcb.ip->so_options &= ~optname;
+ }
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, SOL_SOCKET, optname=0x%x, ..) -> %s\n",
+ s, optname, (*(int*)optval?"on":"off")));
+ break;
+#if LWIP_SO_RCVTIMEO
+ case SO_RCVTIMEO:
+ netconn_set_recvtimeout(sock->conn, *(int*)optval);
+ break;
+#endif /* LWIP_SO_RCVTIMEO */
+#if LWIP_SO_RCVBUF
+ case SO_RCVBUF:
+ netconn_set_recvbufsize(sock->conn, *(int*)optval);
+ break;
+#endif /* LWIP_SO_RCVBUF */
+#if LWIP_UDP
+ case SO_NO_CHECK:
+ if (*(int*)optval) {
+ udp_setflags(sock->conn->pcb.udp, udp_flags(sock->conn->pcb.udp) | UDP_FLAGS_NOCHKSUM);
+ } else {
+ udp_setflags(sock->conn->pcb.udp, udp_flags(sock->conn->pcb.udp) & ~UDP_FLAGS_NOCHKSUM);
+ }
+ break;
+#endif /* LWIP_UDP */
+ default:
+ LWIP_ASSERT("unhandled optname", 0);
+ break;
+ } /* switch (optname) */
+ break;
+
+/* Level: IPPROTO_IP */
+ case IPPROTO_IP:
+ switch (optname) {
+ case IP_TTL:
+ sock->conn->pcb.ip->ttl = (u8_t)(*(int*)optval);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_IP, IP_TTL, ..) -> %d\n",
+ s, sock->conn->pcb.ip->ttl));
+ break;
+ case IP_TOS:
+ sock->conn->pcb.ip->tos = (u8_t)(*(int*)optval);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_IP, IP_TOS, ..)-> %d\n",
+ s, sock->conn->pcb.ip->tos));
+ break;
+#if LWIP_IGMP
+ case IP_MULTICAST_TTL:
+ sock->conn->pcb.udp->ttl = (u8_t)(*(u8_t*)optval);
+ break;
+ case IP_MULTICAST_IF:
+ inet_addr_to_ipaddr(&sock->conn->pcb.udp->multicast_ip, (struct in_addr*)optval);
+ break;
+ case IP_MULTICAST_LOOP:
+ if (*(u8_t*)optval) {
+ udp_setflags(sock->conn->pcb.udp, udp_flags(sock->conn->pcb.udp) | UDP_FLAGS_MULTICAST_LOOP);
+ } else {
+ udp_setflags(sock->conn->pcb.udp, udp_flags(sock->conn->pcb.udp) & ~UDP_FLAGS_MULTICAST_LOOP);
+ }
+ break;
+ case IP_ADD_MEMBERSHIP:
+ case IP_DROP_MEMBERSHIP:
+ {
+ /* If this is a TCP or a RAW socket, ignore these options. */
+ struct ip_mreq *imr = (struct ip_mreq *)optval;
+ ip_addr_t if_addr;
+ ip_addr_t multi_addr;
+ inet_addr_to_ipaddr(&if_addr, &imr->imr_interface);
+ inet_addr_to_ipaddr(&multi_addr, &imr->imr_multiaddr);
+ if(optname == IP_ADD_MEMBERSHIP){
+ data->err = igmp_joingroup(&if_addr, &multi_addr);
+ } else {
+ data->err = igmp_leavegroup(&if_addr, &multi_addr);
+ }
+ if(data->err != ERR_OK) {
+ data->err = EADDRNOTAVAIL;
+ }
+ }
+ break;
+#endif /* LWIP_IGMP */
+ default:
+ LWIP_ASSERT("unhandled optname", 0);
+ break;
+ } /* switch (optname) */
+ break;
+
+#if LWIP_TCP
+/* Level: IPPROTO_TCP */
+ case IPPROTO_TCP:
+ switch (optname) {
+ case TCP_NODELAY:
+ if (*(int*)optval) {
+ tcp_nagle_disable(sock->conn->pcb.tcp);
+ } else {
+ tcp_nagle_enable(sock->conn->pcb.tcp);
+ }
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_NODELAY) -> %s\n",
+ s, (*(int *)optval)?"on":"off") );
+ break;
+ case TCP_KEEPALIVE:
+ sock->conn->pcb.tcp->keep_idle = (u32_t)(*(int*)optval);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_KEEPALIVE) -> %"U32_F"\n",
+ s, sock->conn->pcb.tcp->keep_idle));
+ break;
+
+#if LWIP_TCP_KEEPALIVE
+ case TCP_KEEPIDLE:
+ sock->conn->pcb.tcp->keep_idle = 1000*(u32_t)(*(int*)optval);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_KEEPIDLE) -> %"U32_F"\n",
+ s, sock->conn->pcb.tcp->keep_idle));
+ break;
+ case TCP_KEEPINTVL:
+ sock->conn->pcb.tcp->keep_intvl = 1000*(u32_t)(*(int*)optval);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_KEEPINTVL) -> %"U32_F"\n",
+ s, sock->conn->pcb.tcp->keep_intvl));
+ break;
+ case TCP_KEEPCNT:
+ sock->conn->pcb.tcp->keep_cnt = (u32_t)(*(int*)optval);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_KEEPCNT) -> %"U32_F"\n",
+ s, sock->conn->pcb.tcp->keep_cnt));
+ break;
+#endif /* LWIP_TCP_KEEPALIVE */
+ default:
+ LWIP_ASSERT("unhandled optname", 0);
+ break;
+ } /* switch (optname) */
+ break;
+#endif /* LWIP_TCP*/
+#if LWIP_UDP && LWIP_UDPLITE
+ /* Level: IPPROTO_UDPLITE */
+ case IPPROTO_UDPLITE:
+ switch (optname) {
+ case UDPLITE_SEND_CSCOV:
+ if ((*(int*)optval != 0) && ((*(int*)optval < 8)) || (*(int*)optval > 0xffff)) {
+ /* don't allow illegal values! */
+ sock->conn->pcb.udp->chksum_len_tx = 8;
+ } else {
+ sock->conn->pcb.udp->chksum_len_tx = (u16_t)*(int*)optval;
+ }
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_UDPLITE, UDPLITE_SEND_CSCOV) -> %d\n",
+ s, (*(int*)optval)) );
+ break;
+ case UDPLITE_RECV_CSCOV:
+ if ((*(int*)optval != 0) && ((*(int*)optval < 8)) || (*(int*)optval > 0xffff)) {
+ /* don't allow illegal values! */
+ sock->conn->pcb.udp->chksum_len_rx = 8;
+ } else {
+ sock->conn->pcb.udp->chksum_len_rx = (u16_t)*(int*)optval;
+ }
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_UDPLITE, UDPLITE_RECV_CSCOV) -> %d\n",
+ s, (*(int*)optval)) );
+ break;
+ default:
+ LWIP_ASSERT("unhandled optname", 0);
+ break;
+ } /* switch (optname) */
+ break;
+#endif /* LWIP_UDP */
+ default:
+ LWIP_ASSERT("unhandled level", 0);
+ break;
+ } /* switch (level) */
+ sys_sem_signal(&sock->conn->op_completed);
+}
+
+int
+lwip_ioctl(int s, long cmd, void *argp)
+{
+ struct lwip_sock *sock = get_socket(s);
+ u8_t val;
+#if LWIP_SO_RCVBUF
+ u16_t buflen = 0;
+ s16_t recv_avail;
+#endif /* LWIP_SO_RCVBUF */
+
+ if (!sock) {
+ return -1;
+ }
+
+ switch (cmd) {
+#if LWIP_SO_RCVBUF
+ case FIONREAD:
+ if (!argp) {
+ sock_set_errno(sock, EINVAL);
+ return -1;
+ }
+
+ SYS_ARCH_GET(sock->conn->recv_avail, recv_avail);
+ if (recv_avail < 0) {
+ recv_avail = 0;
+ }
+ *((u16_t*)argp) = (u16_t)recv_avail;
+
+ /* Check if there is data left from the last recv operation. /maq 041215 */
+ if (sock->lastdata) {
+ struct pbuf *p = (struct pbuf *)sock->lastdata;
+ if (netconn_type(sock->conn) != NETCONN_TCP) {
+ p = ((struct netbuf *)p)->p;
+ }
+ buflen = p->tot_len;
+ buflen -= sock->lastoffset;
+
+ *((u16_t*)argp) += buflen;
+ }
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_ioctl(%d, FIONREAD, %p) = %"U16_F"\n", s, argp, *((u16_t*)argp)));
+ sock_set_errno(sock, 0);
+ return 0;
+#endif /* LWIP_SO_RCVBUF */
+
+ case FIONBIO:
+ val = 0;
+ if (argp && *(u32_t*)argp) {
+ val = 1;
+ }
+ netconn_set_nonblocking(sock->conn, val);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_ioctl(%d, FIONBIO, %d)\n", s, val));
+ sock_set_errno(sock, 0);
+ return 0;
+
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_ioctl(%d, UNIMPL: 0x%lx, %p)\n", s, cmd, argp));
+ sock_set_errno(sock, ENOSYS); /* not yet implemented */
+ return -1;
+ } /* switch (cmd) */
+}
+
+/** A minimal implementation of fcntl.
+ * Currently only the commands F_GETFL and F_SETFL are implemented.
+ * Only the flag O_NONBLOCK is implemented.
+ */
+int
+lwip_fcntl(int s, int cmd, int val)
+{
+ struct lwip_sock *sock = get_socket(s);
+ int ret = -1;
+
+ if (!sock || !sock->conn) {
+ return -1;
+ }
+
+ switch (cmd) {
+ case F_GETFL:
+ ret = netconn_is_nonblocking(sock->conn) ? O_NONBLOCK : 0;
+ break;
+ case F_SETFL:
+ if ((val & ~O_NONBLOCK) == 0) {
+ /* only O_NONBLOCK, all other bits are zero */
+ netconn_set_nonblocking(sock->conn, val & O_NONBLOCK);
+ ret = 0;
+ }
+ break;
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_fcntl(%d, UNIMPL: %d, %d)\n", s, cmd, val));
+ break;
+ }
+ return ret;
+}
+
+#endif /* LWIP_SOCKET */
--- /dev/null
+/**
+ * @file
+ * Sequential API Main thread module
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if !NO_SYS /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/sys.h"
+#include "lwip/memp.h"
+#include "lwip/mem.h"
+#include "lwip/pbuf.h"
+#include "lwip/tcpip.h"
+#include "lwip/init.h"
+#include "netif/etharp.h"
+#include "netif/ppp_oe.h"
+
+/* global variables */
+static tcpip_init_done_fn tcpip_init_done;
+static void *tcpip_init_done_arg;
+static sys_mbox_t mbox;
+
+#if LWIP_TCPIP_CORE_LOCKING
+/** The global semaphore to lock the stack. */
+sys_mutex_t lock_tcpip_core;
+#endif /* LWIP_TCPIP_CORE_LOCKING */
+
+
+/**
+ * The main lwIP thread. This thread has exclusive access to lwIP core functions
+ * (unless access to them is not locked). Other threads communicate with this
+ * thread using message boxes.
+ *
+ * It also starts all the timers to make sure they are running in the right
+ * thread context.
+ *
+ * @param arg unused argument
+ */
+static void
+tcpip_thread(void *arg)
+{
+ struct tcpip_msg *msg;
+ LWIP_UNUSED_ARG(arg);
+
+ if (tcpip_init_done != NULL) {
+ tcpip_init_done(tcpip_init_done_arg);
+ }
+
+ LOCK_TCPIP_CORE();
+ while (1) { /* MAIN Loop */
+ UNLOCK_TCPIP_CORE();
+ LWIP_TCPIP_THREAD_ALIVE();
+ /* wait for a message, timeouts are processed while waiting */
+ sys_timeouts_mbox_fetch(&mbox, (void **)&msg);
+ LOCK_TCPIP_CORE();
+ switch (msg->type) {
+#if LWIP_NETCONN
+ case TCPIP_MSG_API:
+ LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: API message %p\n", (void *)msg));
+ msg->msg.apimsg->function(&(msg->msg.apimsg->msg));
+ break;
+#endif /* LWIP_NETCONN */
+
+#if !LWIP_TCPIP_CORE_LOCKING_INPUT
+ case TCPIP_MSG_INPKT:
+ LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: PACKET %p\n", (void *)msg));
+#if LWIP_ETHERNET
+ if (msg->msg.inp.netif->flags & (NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET)) {
+ ethernet_input(msg->msg.inp.p, msg->msg.inp.netif);
+ } else
+#endif /* LWIP_ETHERNET */
+ {
+ ip_input(msg->msg.inp.p, msg->msg.inp.netif);
+ }
+ memp_free(MEMP_TCPIP_MSG_INPKT, msg);
+ break;
+#endif /* LWIP_TCPIP_CORE_LOCKING_INPUT */
+
+#if LWIP_NETIF_API
+ case TCPIP_MSG_NETIFAPI:
+ LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: Netif API message %p\n", (void *)msg));
+ msg->msg.netifapimsg->function(&(msg->msg.netifapimsg->msg));
+ break;
+#endif /* LWIP_NETIF_API */
+
+ case TCPIP_MSG_CALLBACK:
+ LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: CALLBACK %p\n", (void *)msg));
+ msg->msg.cb.function(msg->msg.cb.ctx);
+ memp_free(MEMP_TCPIP_MSG_API, msg);
+ break;
+
+#if LWIP_TCPIP_TIMEOUT
+ case TCPIP_MSG_TIMEOUT:
+ LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: TIMEOUT %p\n", (void *)msg));
+ sys_timeout(msg->msg.tmo.msecs, msg->msg.tmo.h, msg->msg.tmo.arg);
+ memp_free(MEMP_TCPIP_MSG_API, msg);
+ break;
+ case TCPIP_MSG_UNTIMEOUT:
+ LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: UNTIMEOUT %p\n", (void *)msg));
+ sys_untimeout(msg->msg.tmo.h, msg->msg.tmo.arg);
+ memp_free(MEMP_TCPIP_MSG_API, msg);
+ break;
+#endif /* LWIP_TCPIP_TIMEOUT */
+
+ default:
+ LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: invalid message: %d\n", msg->type));
+ LWIP_ASSERT("tcpip_thread: invalid message", 0);
+ break;
+ }
+ }
+}
+
+/**
+ * Pass a received packet to tcpip_thread for input processing
+ *
+ * @param p the received packet, p->payload pointing to the Ethernet header or
+ * to an IP header (if inp doesn't have NETIF_FLAG_ETHARP or
+ * NETIF_FLAG_ETHERNET flags)
+ * @param inp the network interface on which the packet was received
+ */
+err_t
+tcpip_input(struct pbuf *p, struct netif *inp)
+{
+#if LWIP_TCPIP_CORE_LOCKING_INPUT
+ err_t ret;
+ LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_input: PACKET %p/%p\n", (void *)p, (void *)inp));
+ LOCK_TCPIP_CORE();
+#if LWIP_ETHERNET
+ if (inp->flags & (NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET)) {
+ ret = ethernet_input(p, inp);
+ } else
+#endif /* LWIP_ETHERNET */
+ {
+ ret = ip_input(p, inp);
+ }
+ UNLOCK_TCPIP_CORE();
+ return ret;
+#else /* LWIP_TCPIP_CORE_LOCKING_INPUT */
+ struct tcpip_msg *msg;
+
+ if (sys_mbox_valid(&mbox)) {
+ msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_INPKT);
+ if (msg == NULL) {
+ return ERR_MEM;
+ }
+
+ msg->type = TCPIP_MSG_INPKT;
+ msg->msg.inp.p = p;
+ msg->msg.inp.netif = inp;
+ if (sys_mbox_trypost(&mbox, msg) != ERR_OK) {
+ memp_free(MEMP_TCPIP_MSG_INPKT, msg);
+ return ERR_MEM;
+ }
+ return ERR_OK;
+ }
+ return ERR_VAL;
+#endif /* LWIP_TCPIP_CORE_LOCKING_INPUT */
+}
+
+/**
+ * Call a specific function in the thread context of
+ * tcpip_thread for easy access synchronization.
+ * A function called in that way may access lwIP core code
+ * without fearing concurrent access.
+ *
+ * @param f the function to call
+ * @param ctx parameter passed to f
+ * @param block 1 to block until the request is posted, 0 to non-blocking mode
+ * @return ERR_OK if the function was called, another err_t if not
+ */
+err_t
+tcpip_callback_with_block(tcpip_callback_fn function, void *ctx, u8_t block)
+{
+ struct tcpip_msg *msg;
+
+ if (sys_mbox_valid(&mbox)) {
+ msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
+ if (msg == NULL) {
+ return ERR_MEM;
+ }
+
+ msg->type = TCPIP_MSG_CALLBACK;
+ msg->msg.cb.function = function;
+ msg->msg.cb.ctx = ctx;
+ if (block) {
+ sys_mbox_post(&mbox, msg);
+ } else {
+ if (sys_mbox_trypost(&mbox, msg) != ERR_OK) {
+ memp_free(MEMP_TCPIP_MSG_API, msg);
+ return ERR_MEM;
+ }
+ }
+ return ERR_OK;
+ }
+ return ERR_VAL;
+}
+
+#if LWIP_TCPIP_TIMEOUT
+/**
+ * call sys_timeout in tcpip_thread
+ *
+ * @param msec time in milliseconds for timeout
+ * @param h function to be called on timeout
+ * @param arg argument to pass to timeout function h
+ * @return ERR_MEM on memory error, ERR_OK otherwise
+ */
+err_t
+tcpip_timeout(u32_t msecs, sys_timeout_handler h, void *arg)
+{
+ struct tcpip_msg *msg;
+
+ if (sys_mbox_valid(&mbox)) {
+ msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
+ if (msg == NULL) {
+ return ERR_MEM;
+ }
+
+ msg->type = TCPIP_MSG_TIMEOUT;
+ msg->msg.tmo.msecs = msecs;
+ msg->msg.tmo.h = h;
+ msg->msg.tmo.arg = arg;
+ sys_mbox_post(&mbox, msg);
+ return ERR_OK;
+ }
+ return ERR_VAL;
+}
+
+/**
+ * call sys_untimeout in tcpip_thread
+ *
+ * @param msec time in milliseconds for timeout
+ * @param h function to be called on timeout
+ * @param arg argument to pass to timeout function h
+ * @return ERR_MEM on memory error, ERR_OK otherwise
+ */
+err_t
+tcpip_untimeout(sys_timeout_handler h, void *arg)
+{
+ struct tcpip_msg *msg;
+
+ if (sys_mbox_valid(&mbox)) {
+ msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
+ if (msg == NULL) {
+ return ERR_MEM;
+ }
+
+ msg->type = TCPIP_MSG_UNTIMEOUT;
+ msg->msg.tmo.h = h;
+ msg->msg.tmo.arg = arg;
+ sys_mbox_post(&mbox, msg);
+ return ERR_OK;
+ }
+ return ERR_VAL;
+}
+#endif /* LWIP_TCPIP_TIMEOUT */
+
+#if LWIP_NETCONN
+/**
+ * Call the lower part of a netconn_* function
+ * This function is then running in the thread context
+ * of tcpip_thread and has exclusive access to lwIP core code.
+ *
+ * @param apimsg a struct containing the function to call and its parameters
+ * @return ERR_OK if the function was called, another err_t if not
+ */
+err_t
+tcpip_apimsg(struct api_msg *apimsg)
+{
+ struct tcpip_msg msg;
+#ifdef LWIP_DEBUG
+ /* catch functions that don't set err */
+ apimsg->msg.err = ERR_VAL;
+#endif
+
+ if (sys_mbox_valid(&mbox)) {
+ msg.type = TCPIP_MSG_API;
+ msg.msg.apimsg = apimsg;
+ sys_mbox_post(&mbox, &msg);
+ sys_arch_sem_wait(&apimsg->msg.conn->op_completed, 0);
+ return apimsg->msg.err;
+ }
+ return ERR_VAL;
+}
+
+#if LWIP_TCPIP_CORE_LOCKING
+/**
+ * Call the lower part of a netconn_* function
+ * This function has exclusive access to lwIP core code by locking it
+ * before the function is called.
+ *
+ * @param apimsg a struct containing the function to call and its parameters
+ * @return ERR_OK (only for compatibility fo tcpip_apimsg())
+ */
+err_t
+tcpip_apimsg_lock(struct api_msg *apimsg)
+{
+#ifdef LWIP_DEBUG
+ /* catch functions that don't set err */
+ apimsg->msg.err = ERR_VAL;
+#endif
+
+ LOCK_TCPIP_CORE();
+ apimsg->function(&(apimsg->msg));
+ UNLOCK_TCPIP_CORE();
+ return apimsg->msg.err;
+
+}
+#endif /* LWIP_TCPIP_CORE_LOCKING */
+#endif /* LWIP_NETCONN */
+
+#if LWIP_NETIF_API
+#if !LWIP_TCPIP_CORE_LOCKING
+/**
+ * Much like tcpip_apimsg, but calls the lower part of a netifapi_*
+ * function.
+ *
+ * @param netifapimsg a struct containing the function to call and its parameters
+ * @return error code given back by the function that was called
+ */
+err_t
+tcpip_netifapi(struct netifapi_msg* netifapimsg)
+{
+ struct tcpip_msg msg;
+
+ if (sys_mbox_valid(&mbox)) {
+ err_t err = sys_sem_new(&netifapimsg->msg.sem, 0);
+ if (err != ERR_OK) {
+ netifapimsg->msg.err = err;
+ return err;
+ }
+
+ msg.type = TCPIP_MSG_NETIFAPI;
+ msg.msg.netifapimsg = netifapimsg;
+ sys_mbox_post(&mbox, &msg);
+ sys_sem_wait(&netifapimsg->msg.sem);
+ sys_sem_free(&netifapimsg->msg.sem);
+ return netifapimsg->msg.err;
+ }
+ return ERR_VAL;
+}
+#else /* !LWIP_TCPIP_CORE_LOCKING */
+/**
+ * Call the lower part of a netifapi_* function
+ * This function has exclusive access to lwIP core code by locking it
+ * before the function is called.
+ *
+ * @param netifapimsg a struct containing the function to call and its parameters
+ * @return ERR_OK (only for compatibility fo tcpip_netifapi())
+ */
+err_t
+tcpip_netifapi_lock(struct netifapi_msg* netifapimsg)
+{
+ LOCK_TCPIP_CORE();
+ netifapimsg->function(&(netifapimsg->msg));
+ UNLOCK_TCPIP_CORE();
+ return netifapimsg->msg.err;
+}
+#endif /* !LWIP_TCPIP_CORE_LOCKING */
+#endif /* LWIP_NETIF_API */
+
+/**
+ * Initialize this module:
+ * - initialize all sub modules
+ * - start the tcpip_thread
+ *
+ * @param initfunc a function to call when tcpip_thread is running and finished initializing
+ * @param arg argument to pass to initfunc
+ */
+void
+tcpip_init(tcpip_init_done_fn initfunc, void *arg)
+{
+ lwip_init();
+
+ tcpip_init_done = initfunc;
+ tcpip_init_done_arg = arg;
+ if(sys_mbox_new(&mbox, TCPIP_MBOX_SIZE) != ERR_OK) {
+ LWIP_ASSERT("failed to create tcpip_thread mbox", 0);
+ }
+#if LWIP_TCPIP_CORE_LOCKING
+ if(sys_mutex_new(&lock_tcpip_core) != ERR_OK) {
+ LWIP_ASSERT("failed to create lock_tcpip_core", 0);
+ }
+#endif /* LWIP_TCPIP_CORE_LOCKING */
+
+ sys_thread_new(TCPIP_THREAD_NAME, tcpip_thread, NULL, TCPIP_THREAD_STACKSIZE, TCPIP_THREAD_PRIO);
+}
+
+/**
+ * Simple callback function used with tcpip_callback to free a pbuf
+ * (pbuf_free has a wrong signature for tcpip_callback)
+ *
+ * @param p The pbuf (chain) to be dereferenced.
+ */
+static void
+pbuf_free_int(void *p)
+{
+ struct pbuf *q = (struct pbuf *)p;
+ pbuf_free(q);
+}
+
+/**
+ * A simple wrapper function that allows you to free a pbuf from interrupt context.
+ *
+ * @param p The pbuf (chain) to be dereferenced.
+ * @return ERR_OK if callback could be enqueued, an err_t if not
+ */
+err_t
+pbuf_free_callback(struct pbuf *p)
+{
+ return tcpip_callback_with_block(pbuf_free_int, p, 0);
+}
+
+/**
+ * A simple wrapper function that allows you to free heap memory from
+ * interrupt context.
+ *
+ * @param m the heap memory to free
+ * @return ERR_OK if callback could be enqueued, an err_t if not
+ */
+err_t
+mem_free_callback(void *m)
+{
+ return tcpip_callback_with_block(mem_free, m, 0);
+}
+
+#endif /* !NO_SYS */
--- /dev/null
+/**
+ * @file
+ * Common functions used throughout the stack.
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Simon Goldschmidt
+ *
+ */
+
+#include "lwip/opt.h"
+#include "lwip/def.h"
+
+/**
+ * These are reference implementations of the byte swapping functions.
+ * Again with the aim of being simple, correct and fully portable.
+ * Byte swapping is the second thing you would want to optimize. You will
+ * need to port it to your architecture and in your cc.h:
+ *
+ * #define LWIP_PLATFORM_BYTESWAP 1
+ * #define LWIP_PLATFORM_HTONS(x) <your_htons>
+ * #define LWIP_PLATFORM_HTONL(x) <your_htonl>
+ *
+ * Note ntohs() and ntohl() are merely references to the htonx counterparts.
+ */
+
+#if (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN)
+
+/**
+ * Convert an u16_t from host- to network byte order.
+ *
+ * @param n u16_t in host byte order
+ * @return n in network byte order
+ */
+u16_t
+lwip_htons(u16_t n)
+{
+ return ((n & 0xff) << 8) | ((n & 0xff00) >> 8);
+}
+
+/**
+ * Convert an u16_t from network- to host byte order.
+ *
+ * @param n u16_t in network byte order
+ * @return n in host byte order
+ */
+u16_t
+lwip_ntohs(u16_t n)
+{
+ return lwip_htons(n);
+}
+
+/**
+ * Convert an u32_t from host- to network byte order.
+ *
+ * @param n u32_t in host byte order
+ * @return n in network byte order
+ */
+u32_t
+lwip_htonl(u32_t n)
+{
+ return ((n & 0xff) << 24) |
+ ((n & 0xff00) << 8) |
+ ((n & 0xff0000UL) >> 8) |
+ ((n & 0xff000000UL) >> 24);
+}
+
+/**
+ * Convert an u32_t from network- to host byte order.
+ *
+ * @param n u32_t in network byte order
+ * @return n in host byte order
+ */
+u32_t
+lwip_ntohl(u32_t n)
+{
+ return lwip_htonl(n);
+}
+
+#endif /* (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN) */
--- /dev/null
+/**
+ * @file
+ * Dynamic Host Configuration Protocol client
+ *
+ */
+
+/*
+ *
+ * Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
+ * Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is a contribution to the lwIP TCP/IP stack.
+ * The Swedish Institute of Computer Science and Adam Dunkels
+ * are specifically granted permission to redistribute this
+ * source code.
+ *
+ * Author: Leon Woestenberg <leon.woestenberg@gmx.net>
+ *
+ * This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
+ * with RFC 2131 and RFC 2132.
+ *
+ * TODO:
+ * - Support for interfaces other than Ethernet (SLIP, PPP, ...)
+ *
+ * Please coordinate changes and requests with Leon Woestenberg
+ * <leon.woestenberg@gmx.net>
+ *
+ * Integration with your code:
+ *
+ * In lwip/dhcp.h
+ * #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
+ * #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
+ *
+ * Then have your application call dhcp_coarse_tmr() and
+ * dhcp_fine_tmr() on the defined intervals.
+ *
+ * dhcp_start(struct netif *netif);
+ * starts a DHCP client instance which configures the interface by
+ * obtaining an IP address lease and maintaining it.
+ *
+ * Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
+ * to remove the DHCP client.
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/stats.h"
+#include "lwip/mem.h"
+#include "lwip/udp.h"
+#include "lwip/ip_addr.h"
+#include "lwip/netif.h"
+#include "lwip/def.h"
+#include "lwip/sys.h"
+#include "lwip/dhcp.h"
+#include "lwip/autoip.h"
+#include "lwip/dns.h"
+#include "netif/etharp.h"
+
+#include <string.h>
+
+/** Default for DHCP_GLOBAL_XID is 0xABCD0000
+ * This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
+ * #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
+ * #define DHCP_GLOBAL_XID rand()
+ */
+#ifdef DHCP_GLOBAL_XID_HEADER
+#include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
+#endif
+
+/** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
+ * MTU is checked to be big enough in dhcp_start */
+#define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
+#define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
+/** Minimum length for reply before packet is parsed */
+#define DHCP_MIN_REPLY_LEN 44
+
+#define REBOOT_TRIES 2
+
+/** Option handling: options are parsed in dhcp_parse_reply
+ * and saved in an array where other functions can load them from.
+ * This might be moved into the struct dhcp (not necessarily since
+ * lwIP is single-threaded and the array is only used while in recv
+ * callback). */
+#define DHCP_OPTION_IDX_OVERLOAD 0
+#define DHCP_OPTION_IDX_MSG_TYPE 1
+#define DHCP_OPTION_IDX_SERVER_ID 2
+#define DHCP_OPTION_IDX_LEASE_TIME 3
+#define DHCP_OPTION_IDX_T1 4
+#define DHCP_OPTION_IDX_T2 5
+#define DHCP_OPTION_IDX_SUBNET_MASK 6
+#define DHCP_OPTION_IDX_ROUTER 7
+#define DHCP_OPTION_IDX_DNS_SERVER 8
+#define DHCP_OPTION_IDX_MAX (DHCP_OPTION_IDX_DNS_SERVER + DNS_MAX_SERVERS)
+
+/** Holds the decoded option values, only valid while in dhcp_recv.
+ @todo: move this into struct dhcp? */
+u32_t dhcp_rx_options_val[DHCP_OPTION_IDX_MAX];
+/** Holds a flag which option was received and is contained in dhcp_rx_options_val,
+ only valid while in dhcp_recv.
+ @todo: move this into struct dhcp? */
+u8_t dhcp_rx_options_given[DHCP_OPTION_IDX_MAX];
+
+#define dhcp_option_given(dhcp, idx) (dhcp_rx_options_given[idx] != 0)
+#define dhcp_got_option(dhcp, idx) (dhcp_rx_options_given[idx] = 1)
+#define dhcp_clear_option(dhcp, idx) (dhcp_rx_options_given[idx] = 0)
+#define dhcp_clear_all_options(dhcp) (memset(dhcp_rx_options_given, 0, sizeof(dhcp_rx_options_given)))
+#define dhcp_get_option_value(dhcp, idx) (dhcp_rx_options_val[idx])
+#define dhcp_set_option_value(dhcp, idx, val) (dhcp_rx_options_val[idx] = (val))
+
+
+/* DHCP client state machine functions */
+static err_t dhcp_discover(struct netif *netif);
+static err_t dhcp_select(struct netif *netif);
+static void dhcp_bind(struct netif *netif);
+#if DHCP_DOES_ARP_CHECK
+static err_t dhcp_decline(struct netif *netif);
+#endif /* DHCP_DOES_ARP_CHECK */
+static err_t dhcp_rebind(struct netif *netif);
+static err_t dhcp_reboot(struct netif *netif);
+static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
+
+/* receive, unfold, parse and free incoming messages */
+static void dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
+
+/* set the DHCP timers */
+static void dhcp_timeout(struct netif *netif);
+static void dhcp_t1_timeout(struct netif *netif);
+static void dhcp_t2_timeout(struct netif *netif);
+
+/* build outgoing messages */
+/* create a DHCP message, fill in common headers */
+static err_t dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type);
+/* free a DHCP request */
+static void dhcp_delete_msg(struct dhcp *dhcp);
+/* add a DHCP option (type, then length in bytes) */
+static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
+/* add option values */
+static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
+static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
+static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
+/* always add the DHCP options trailer to end and pad */
+static void dhcp_option_trailer(struct dhcp *dhcp);
+
+/**
+ * Back-off the DHCP client (because of a received NAK response).
+ *
+ * Back-off the DHCP client because of a received NAK. Receiving a
+ * NAK means the client asked for something non-sensible, for
+ * example when it tries to renew a lease obtained on another network.
+ *
+ * We clear any existing set IP address and restart DHCP negotiation
+ * afresh (as per RFC2131 3.2.3).
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_handle_nak(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
+ (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
+ /* Set the interface down since the address must no longer be used, as per RFC2131 */
+ netif_set_down(netif);
+ /* remove IP address from interface */
+ netif_set_ipaddr(netif, IP_ADDR_ANY);
+ netif_set_gw(netif, IP_ADDR_ANY);
+ netif_set_netmask(netif, IP_ADDR_ANY);
+ /* Change to a defined state */
+ dhcp_set_state(dhcp, DHCP_BACKING_OFF);
+ /* We can immediately restart discovery */
+ dhcp_discover(netif);
+}
+
+#if DHCP_DOES_ARP_CHECK
+/**
+ * Checks if the offered IP address is already in use.
+ *
+ * It does so by sending an ARP request for the offered address and
+ * entering CHECKING state. If no ARP reply is received within a small
+ * interval, the address is assumed to be free for use by us.
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_check(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result;
+ u16_t msecs;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
+ (s16_t)netif->name[1]));
+ dhcp_set_state(dhcp, DHCP_CHECKING);
+ /* create an ARP query for the offered IP address, expecting that no host
+ responds, as the IP address should not be in use. */
+ result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
+ if (result != ERR_OK) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_check: could not perform ARP query\n"));
+ }
+ dhcp->tries++;
+ msecs = 500;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
+}
+#endif /* DHCP_DOES_ARP_CHECK */
+
+/**
+ * Remember the configuration offered by a DHCP server.
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_handle_offer(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
+ (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
+ /* obtain the server address */
+ if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SERVER_ID)) {
+ ip4_addr_set_u32(&dhcp->server_ip_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SERVER_ID)));
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n",
+ ip4_addr_get_u32(&dhcp->server_ip_addr)));
+ /* remember offered address */
+ ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n",
+ ip4_addr_get_u32(&dhcp->offered_ip_addr)));
+
+ dhcp_select(netif);
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
+ ("dhcp_handle_offer(netif=%p) did not get server ID!\n", (void*)netif));
+ }
+}
+
+/**
+ * Select a DHCP server offer out of all offers.
+ *
+ * Simply select the first offer received.
+ *
+ * @param netif the netif under DHCP control
+ * @return lwIP specific error (see error.h)
+ */
+static err_t
+dhcp_select(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result;
+ u16_t msecs;
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_select(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
+ dhcp_set_state(dhcp, DHCP_REQUESTING);
+
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
+ if (result == ERR_OK) {
+ dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
+ dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
+
+ /* MUST request the offered IP address */
+ dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
+ dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
+
+ dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
+ dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->server_ip_addr)));
+
+ dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
+ dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
+ dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
+ dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
+ dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
+
+#if LWIP_NETIF_HOSTNAME
+ if (netif->hostname != NULL) {
+ const char *p = (const char*)netif->hostname;
+ u8_t namelen = (u8_t)strlen(p);
+ if (namelen > 0) {
+ LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
+ dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
+ while (*p) {
+ dhcp_option_byte(dhcp, *p++);
+ }
+ }
+ }
+#endif /* LWIP_NETIF_HOSTNAME */
+
+ dhcp_option_trailer(dhcp);
+ /* shrink the pbuf to the actual content length */
+ pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
+
+ /* send broadcast to any DHCP server */
+ udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
+ dhcp_delete_msg(dhcp);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("dhcp_select: could not allocate DHCP request\n"));
+ }
+ dhcp->tries++;
+ msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
+ return result;
+}
+
+/**
+ * The DHCP timer that checks for lease renewal/rebind timeouts.
+ */
+void
+dhcp_coarse_tmr()
+{
+ struct netif *netif = netif_list;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
+ /* iterate through all network interfaces */
+ while (netif != NULL) {
+ /* only act on DHCP configured interfaces */
+ if (netif->dhcp != NULL) {
+ /* timer is active (non zero), and triggers (zeroes) now? */
+ if (netif->dhcp->t2_timeout-- == 1) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
+ /* this clients' rebind timeout triggered */
+ dhcp_t2_timeout(netif);
+ /* timer is active (non zero), and triggers (zeroes) now */
+ } else if (netif->dhcp->t1_timeout-- == 1) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
+ /* this clients' renewal timeout triggered */
+ dhcp_t1_timeout(netif);
+ }
+ }
+ /* proceed to next netif */
+ netif = netif->next;
+ }
+}
+
+/**
+ * DHCP transaction timeout handling
+ *
+ * A DHCP server is expected to respond within a short period of time.
+ * This timer checks whether an outstanding DHCP request is timed out.
+ */
+void
+dhcp_fine_tmr()
+{
+ struct netif *netif = netif_list;
+ /* loop through netif's */
+ while (netif != NULL) {
+ /* only act on DHCP configured interfaces */
+ if (netif->dhcp != NULL) {
+ /* timer is active (non zero), and is about to trigger now */
+ if (netif->dhcp->request_timeout > 1) {
+ netif->dhcp->request_timeout--;
+ }
+ else if (netif->dhcp->request_timeout == 1) {
+ netif->dhcp->request_timeout--;
+ /* { netif->dhcp->request_timeout == 0 } */
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
+ /* this client's request timeout triggered */
+ dhcp_timeout(netif);
+ }
+ }
+ /* proceed to next network interface */
+ netif = netif->next;
+ }
+}
+
+/**
+ * A DHCP negotiation transaction, or ARP request, has timed out.
+ *
+ * The timer that was started with the DHCP or ARP request has
+ * timed out, indicating no response was received in time.
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_timeout(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout()\n"));
+ /* back-off period has passed, or server selection timed out */
+ if ((dhcp->state == DHCP_BACKING_OFF) || (dhcp->state == DHCP_SELECTING)) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
+ dhcp_discover(netif);
+ /* receiving the requested lease timed out */
+ } else if (dhcp->state == DHCP_REQUESTING) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
+ if (dhcp->tries <= 5) {
+ dhcp_select(netif);
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
+ dhcp_release(netif);
+ dhcp_discover(netif);
+ }
+#if DHCP_DOES_ARP_CHECK
+ /* received no ARP reply for the offered address (which is good) */
+ } else if (dhcp->state == DHCP_CHECKING) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
+ if (dhcp->tries <= 1) {
+ dhcp_check(netif);
+ /* no ARP replies on the offered address,
+ looks like the IP address is indeed free */
+ } else {
+ /* bind the interface to the offered address */
+ dhcp_bind(netif);
+ }
+#endif /* DHCP_DOES_ARP_CHECK */
+ }
+ /* did not get response to renew request? */
+ else if (dhcp->state == DHCP_RENEWING) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
+ /* just retry renewal */
+ /* note that the rebind timer will eventually time-out if renew does not work */
+ dhcp_renew(netif);
+ /* did not get response to rebind request? */
+ } else if (dhcp->state == DHCP_REBINDING) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
+ if (dhcp->tries <= 8) {
+ dhcp_rebind(netif);
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
+ dhcp_release(netif);
+ dhcp_discover(netif);
+ }
+ } else if (dhcp->state == DHCP_REBOOTING) {
+ if (dhcp->tries < REBOOT_TRIES) {
+ dhcp_reboot(netif);
+ } else {
+ dhcp_discover(netif);
+ }
+ }
+}
+
+/**
+ * The renewal period has timed out.
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_t1_timeout(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
+ if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
+ (dhcp->state == DHCP_RENEWING)) {
+ /* just retry to renew - note that the rebind timer (t2) will
+ * eventually time-out if renew tries fail. */
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+ ("dhcp_t1_timeout(): must renew\n"));
+ /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
+ DHCP_RENEWING, not DHCP_BOUND */
+ dhcp_renew(netif);
+ }
+}
+
+/**
+ * The rebind period has timed out.
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_t2_timeout(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
+ if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) ||
+ (dhcp->state == DHCP_RENEWING)) {
+ /* just retry to rebind */
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+ ("dhcp_t2_timeout(): must rebind\n"));
+ /* This slightly different to RFC2131: DHCPREQUEST will be sent from state
+ DHCP_REBINDING, not DHCP_BOUND */
+ dhcp_rebind(netif);
+ }
+}
+
+/**
+ * Handle a DHCP ACK packet
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_handle_ack(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+#if LWIP_DNS
+ u8_t n;
+#endif /* LWIP_DNS */
+
+ /* clear options we might not get from the ACK */
+ ip_addr_set_zero(&dhcp->offered_sn_mask);
+ ip_addr_set_zero(&dhcp->offered_gw_addr);
+#if LWIP_DHCP_BOOTP_FILE
+ ip_addr_set_zero(&dhcp->offered_si_addr);
+#endif /* LWIP_DHCP_BOOTP_FILE */
+
+ /* lease time given? */
+ if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_LEASE_TIME)) {
+ /* remember offered lease time */
+ dhcp->offered_t0_lease = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_LEASE_TIME);
+ }
+ /* renewal period given? */
+ if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T1)) {
+ /* remember given renewal period */
+ dhcp->offered_t1_renew = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T1);
+ } else {
+ /* calculate safe periods for renewal */
+ dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
+ }
+
+ /* renewal period given? */
+ if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_T2)) {
+ /* remember given rebind period */
+ dhcp->offered_t2_rebind = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_T2);
+ } else {
+ /* calculate safe periods for rebinding */
+ dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
+ }
+
+ /* (y)our internet address */
+ ip_addr_copy(dhcp->offered_ip_addr, dhcp->msg_in->yiaddr);
+
+#if LWIP_DHCP_BOOTP_FILE
+ /* copy boot server address,
+ boot file name copied in dhcp_parse_reply if not overloaded */
+ ip_addr_copy(dhcp->offered_si_addr, dhcp->msg_in->siaddr);
+#endif /* LWIP_DHCP_BOOTP_FILE */
+
+ /* subnet mask given? */
+ if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)) {
+ /* remember given subnet mask */
+ ip4_addr_set_u32(&dhcp->offered_sn_mask, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_SUBNET_MASK)));
+ dhcp->subnet_mask_given = 1;
+ } else {
+ dhcp->subnet_mask_given = 0;
+ }
+
+ /* gateway router */
+ if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_ROUTER)) {
+ ip4_addr_set_u32(&dhcp->offered_gw_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_ROUTER)));
+ }
+
+#if LWIP_DNS
+ /* DNS servers */
+ n = 0;
+ while(dhcp_option_given(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n) && (n < DNS_MAX_SERVERS)) {
+ ip_addr_t dns_addr;
+ ip4_addr_set_u32(&dns_addr, htonl(dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_DNS_SERVER + n)));
+ dns_setserver(n, &dns_addr);
+ n++;
+ }
+#endif /* LWIP_DNS */
+}
+
+/** Set a statically allocated struct dhcp to work with.
+ * Using this prevents dhcp_start to allocate it using mem_malloc.
+ *
+ * @param netif the netif for which to set the struct dhcp
+ * @param dhcp (uninitialised) dhcp struct allocated by the application
+ */
+void
+dhcp_set_struct(struct netif *netif, struct dhcp *dhcp)
+{
+ LWIP_ASSERT("netif != NULL", netif != NULL);
+ LWIP_ASSERT("dhcp != NULL", dhcp != NULL);
+ LWIP_ASSERT("netif already has a struct dhcp set", netif->dhcp == NULL);
+
+ /* clear data structure */
+ memset(dhcp, 0, sizeof(struct dhcp));
+ /* dhcp_set_state(&dhcp, DHCP_OFF); */
+ netif->dhcp = dhcp;
+}
+
+/** Removes a struct dhcp from a netif.
+ *
+ * ATTENTION: Only use this when not using dhcp_set_struct() to allocate the
+ * struct dhcp since the memory is passed back to the heap.
+ *
+ * @param netif the netif from which to remove the struct dhcp
+ */
+void dhcp_cleanup(struct netif *netif)
+{
+ LWIP_ASSERT("netif != NULL", netif != NULL);
+
+ if (netif->dhcp != NULL) {
+ mem_free(netif->dhcp);
+ netif->dhcp = NULL;
+ }
+}
+
+/**
+ * Start DHCP negotiation for a network interface.
+ *
+ * If no DHCP client instance was attached to this interface,
+ * a new client is created first. If a DHCP client instance
+ * was already present, it restarts negotiation.
+ *
+ * @param netif The lwIP network interface
+ * @return lwIP error code
+ * - ERR_OK - No error
+ * - ERR_MEM - Out of memory
+ */
+err_t
+dhcp_start(struct netif *netif)
+{
+ struct dhcp *dhcp;
+ err_t result = ERR_OK;
+
+ LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
+ dhcp = netif->dhcp;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
+ /* Remove the flag that says this netif is handled by DHCP,
+ it is set when we succeeded starting. */
+ netif->flags &= ~NETIF_FLAG_DHCP;
+
+ /* check hwtype of the netif */
+ if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): No ETHARP netif\n"));
+ return ERR_ARG;
+ }
+
+ /* check MTU of the netif */
+ if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
+ return ERR_MEM;
+ }
+
+ /* no DHCP client attached yet? */
+ if (dhcp == NULL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
+ dhcp = (struct dhcp *)mem_malloc(sizeof(struct dhcp));
+ if (dhcp == NULL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
+ return ERR_MEM;
+ }
+ /* store this dhcp client in the netif */
+ netif->dhcp = dhcp;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
+ /* already has DHCP client attached */
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(): restarting DHCP configuration\n"));
+ if (dhcp->pcb != NULL) {
+ udp_remove(dhcp->pcb);
+ }
+ LWIP_ASSERT("pbuf p_out wasn't freed", dhcp->p_out == NULL);
+ LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL );
+ }
+
+ /* clear data structure */
+ memset(dhcp, 0, sizeof(struct dhcp));
+ /* dhcp_set_state(&dhcp, DHCP_OFF); */
+ /* allocate UDP PCB */
+ dhcp->pcb = udp_new();
+ if (dhcp->pcb == NULL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
+ return ERR_MEM;
+ }
+ dhcp->pcb->so_options |= SOF_BROADCAST;
+ /* set up local and remote port for the pcb */
+ udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
+ udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
+ /* set up the recv callback and argument */
+ udp_recv(dhcp->pcb, dhcp_recv, netif);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
+ /* (re)start the DHCP negotiation */
+ result = dhcp_discover(netif);
+ if (result != ERR_OK) {
+ /* free resources allocated above */
+ dhcp_stop(netif);
+ return ERR_MEM;
+ }
+ /* Set the flag that says this netif is handled by DHCP. */
+ netif->flags |= NETIF_FLAG_DHCP;
+ return result;
+}
+
+/**
+ * Inform a DHCP server of our manual configuration.
+ *
+ * This informs DHCP servers of our fixed IP address configuration
+ * by sending an INFORM message. It does not involve DHCP address
+ * configuration, it is just here to be nice to the network.
+ *
+ * @param netif The lwIP network interface
+ */
+void
+dhcp_inform(struct netif *netif)
+{
+ struct dhcp dhcp;
+ err_t result = ERR_OK;
+ struct udp_pcb *pcb;
+
+ LWIP_ERROR("netif != NULL", (netif != NULL), return;);
+
+ memset(&dhcp, 0, sizeof(struct dhcp));
+ dhcp_set_state(&dhcp, DHCP_INFORM);
+
+ if ((netif->dhcp != NULL) && (netif->dhcp->pcb != NULL)) {
+ /* re-use existing pcb */
+ pcb = netif->dhcp->pcb;
+ } else {
+ pcb = udp_new();
+ if (pcb == NULL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform(): could not obtain pcb"));
+ return;
+ }
+ dhcp.pcb = pcb;
+ dhcp.pcb->so_options |= SOF_BROADCAST;
+ udp_bind(dhcp.pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
+ }
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_msg(netif, &dhcp, DHCP_INFORM);
+ if (result == ERR_OK) {
+ dhcp_option(&dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
+ dhcp_option_short(&dhcp, DHCP_MAX_MSG_LEN(netif));
+
+ dhcp_option_trailer(&dhcp);
+
+ pbuf_realloc(dhcp.p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp.options_out_len);
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
+ udp_sendto_if(pcb, dhcp.p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
+ dhcp_delete_msg(&dhcp);
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_inform: could not allocate DHCP request\n"));
+ }
+
+ if (dhcp.pcb != NULL) {
+ /* otherwise, the existing pcb was used */
+ udp_remove(dhcp.pcb);
+ }
+}
+
+/** Handle a possible change in the network configuration.
+ *
+ * This enters the REBOOTING state to verify that the currently bound
+ * address is still valid.
+ */
+void
+dhcp_network_changed(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ if (!dhcp)
+ return;
+ switch (dhcp->state) {
+ case DHCP_REBINDING:
+ case DHCP_RENEWING:
+ case DHCP_BOUND:
+ case DHCP_REBOOTING:
+ netif_set_down(netif);
+ dhcp->tries = 0;
+ dhcp_reboot(netif);
+ break;
+ case DHCP_OFF:
+ /* stay off */
+ break;
+ default:
+ dhcp->tries = 0;
+#if LWIP_DHCP_AUTOIP_COOP
+ if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
+ autoip_stop(netif);
+ dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
+ }
+#endif /* LWIP_DHCP_AUTOIP_COOP */
+ dhcp_discover(netif);
+ break;
+ }
+}
+
+#if DHCP_DOES_ARP_CHECK
+/**
+ * Match an ARP reply with the offered IP address.
+ *
+ * @param netif the network interface on which the reply was received
+ * @param addr The IP address we received a reply from
+ */
+void dhcp_arp_reply(struct netif *netif, ip_addr_t *addr)
+{
+ LWIP_ERROR("netif != NULL", (netif != NULL), return;);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_arp_reply()\n"));
+ /* is a DHCP client doing an ARP check? */
+ if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n",
+ ip4_addr_get_u32(addr)));
+ /* did a host respond with the address we
+ were offered by the DHCP server? */
+ if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
+ /* we will not accept the offered address */
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
+ ("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
+ dhcp_decline(netif);
+ }
+ }
+}
+
+/**
+ * Decline an offered lease.
+ *
+ * Tell the DHCP server we do not accept the offered address.
+ * One reason to decline the lease is when we find out the address
+ * is already in use by another host (through ARP).
+ *
+ * @param netif the netif under DHCP control
+ */
+static err_t
+dhcp_decline(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result = ERR_OK;
+ u16_t msecs;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline()\n"));
+ dhcp_set_state(dhcp, DHCP_BACKING_OFF);
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_msg(netif, dhcp, DHCP_DECLINE);
+ if (result == ERR_OK) {
+ dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
+ dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
+
+ dhcp_option_trailer(dhcp);
+ /* resize pbuf to reflect true size of options */
+ pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
+
+ /* per section 4.4.4, broadcast DECLINE messages */
+ udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
+ dhcp_delete_msg(dhcp);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
+ ("dhcp_decline: could not allocate DHCP request\n"));
+ }
+ dhcp->tries++;
+ msecs = 10*1000;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
+ return result;
+}
+#endif /* DHCP_DOES_ARP_CHECK */
+
+
+/**
+ * Start the DHCP process, discover a DHCP server.
+ *
+ * @param netif the netif under DHCP control
+ */
+static err_t
+dhcp_discover(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result = ERR_OK;
+ u16_t msecs;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover()\n"));
+ ip_addr_set_any(&dhcp->offered_ip_addr);
+ dhcp_set_state(dhcp, DHCP_SELECTING);
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_msg(netif, dhcp, DHCP_DISCOVER);
+ if (result == ERR_OK) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
+
+ dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
+ dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
+
+ dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
+ dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
+ dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
+ dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
+ dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
+
+ dhcp_option_trailer(dhcp);
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
+ pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
+ udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
+ dhcp_delete_msg(dhcp);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_discover: could not allocate DHCP request\n"));
+ }
+ dhcp->tries++;
+#if LWIP_DHCP_AUTOIP_COOP
+ if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
+ dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
+ autoip_start(netif);
+ }
+#endif /* LWIP_DHCP_AUTOIP_COOP */
+ msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
+ return result;
+}
+
+
+/**
+ * Bind the interface to the offered IP address.
+ *
+ * @param netif network interface to bind to the offered address
+ */
+static void
+dhcp_bind(struct netif *netif)
+{
+ u32_t timeout;
+ struct dhcp *dhcp;
+ ip_addr_t sn_mask, gw_addr;
+ LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
+ dhcp = netif->dhcp;
+ LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
+
+ /* temporary DHCP lease? */
+ if (dhcp->offered_t1_renew != 0xffffffffUL) {
+ /* set renewal period timer */
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
+ timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
+ if(timeout > 0xffff) {
+ timeout = 0xffff;
+ }
+ dhcp->t1_timeout = (u16_t)timeout;
+ if (dhcp->t1_timeout == 0) {
+ dhcp->t1_timeout = 1;
+ }
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t1_renew*1000));
+ }
+ /* set renewal period timer */
+ if (dhcp->offered_t2_rebind != 0xffffffffUL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
+ timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
+ if(timeout > 0xffff) {
+ timeout = 0xffff;
+ }
+ dhcp->t2_timeout = (u16_t)timeout;
+ if (dhcp->t2_timeout == 0) {
+ dhcp->t2_timeout = 1;
+ }
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t2_rebind*1000));
+ }
+
+ if (dhcp->subnet_mask_given) {
+ /* copy offered network mask */
+ ip_addr_copy(sn_mask, dhcp->offered_sn_mask);
+ } else {
+ /* subnet mask not given, choose a safe subnet mask given the network class */
+ u8_t first_octet = ip4_addr1(&dhcp->offered_ip_addr);
+ if (first_octet <= 127) {
+ ip4_addr_set_u32(&sn_mask, PP_HTONL(0xff000000UL));
+ } else if (first_octet >= 192) {
+ ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffffff00UL));
+ } else {
+ ip4_addr_set_u32(&sn_mask, PP_HTONL(0xffff0000UL));
+ }
+ }
+
+ ip_addr_copy(gw_addr, dhcp->offered_gw_addr);
+ /* gateway address not given? */
+ if (ip_addr_isany(&gw_addr)) {
+ /* copy network address */
+ ip_addr_get_network(&gw_addr, &dhcp->offered_ip_addr, &sn_mask);
+ /* use first host address on network as gateway */
+ ip4_addr_set_u32(&gw_addr, ip4_addr_get_u32(&gw_addr) | PP_HTONL(0x00000001UL));
+ }
+
+#if LWIP_DHCP_AUTOIP_COOP
+ if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
+ autoip_stop(netif);
+ dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
+ }
+#endif /* LWIP_DHCP_AUTOIP_COOP */
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n",
+ ip4_addr_get_u32(&dhcp->offered_ip_addr)));
+ netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n",
+ ip4_addr_get_u32(&sn_mask)));
+ netif_set_netmask(netif, &sn_mask);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n",
+ ip4_addr_get_u32(&gw_addr)));
+ netif_set_gw(netif, &gw_addr);
+ /* bring the interface up */
+ netif_set_up(netif);
+ /* netif is now bound to DHCP leased address */
+ dhcp_set_state(dhcp, DHCP_BOUND);
+}
+
+/**
+ * Renew an existing DHCP lease at the involved DHCP server.
+ *
+ * @param netif network interface which must renew its lease
+ */
+err_t
+dhcp_renew(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result;
+ u16_t msecs;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_renew()\n"));
+ dhcp_set_state(dhcp, DHCP_RENEWING);
+
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
+ if (result == ERR_OK) {
+ dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
+ dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
+
+#if LWIP_NETIF_HOSTNAME
+ if (netif->hostname != NULL) {
+ const char *p = (const char*)netif->hostname;
+ u8_t namelen = (u8_t)strlen(p);
+ if (namelen > 0) {
+ LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
+ dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
+ while (*p) {
+ dhcp_option_byte(dhcp, *p++);
+ }
+ }
+ }
+#endif /* LWIP_NETIF_HOSTNAME */
+
+#if 0
+ dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
+ dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
+#endif
+
+#if 0
+ dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
+ dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
+#endif
+ /* append DHCP message trailer */
+ dhcp_option_trailer(dhcp);
+
+ pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
+
+ udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
+ dhcp_delete_msg(dhcp);
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_renew: could not allocate DHCP request\n"));
+ }
+ dhcp->tries++;
+ /* back-off on retries, but to a maximum of 20 seconds */
+ msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
+ return result;
+}
+
+/**
+ * Rebind with a DHCP server for an existing DHCP lease.
+ *
+ * @param netif network interface which must rebind with a DHCP server
+ */
+static err_t
+dhcp_rebind(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result;
+ u16_t msecs;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind()\n"));
+ dhcp_set_state(dhcp, DHCP_REBINDING);
+
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
+ if (result == ERR_OK) {
+ dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
+ dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
+
+#if LWIP_NETIF_HOSTNAME
+ if (netif->hostname != NULL) {
+ const char *p = (const char*)netif->hostname;
+ u8_t namelen = (u8_t)strlen(p);
+ if (namelen > 0) {
+ LWIP_ASSERT("DHCP: hostname is too long!", namelen < 255);
+ dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, namelen);
+ while (*p) {
+ dhcp_option_byte(dhcp, *p++);
+ }
+ }
+ }
+#endif /* LWIP_NETIF_HOSTNAME */
+
+#if 0
+ dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
+ dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
+
+ dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
+ dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
+#endif
+
+ dhcp_option_trailer(dhcp);
+
+ pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
+
+ /* broadcast to server */
+ udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
+ dhcp_delete_msg(dhcp);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_rebind: could not allocate DHCP request\n"));
+ }
+ dhcp->tries++;
+ msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
+ return result;
+}
+
+/**
+ * Enter REBOOTING state to verify an existing lease
+ *
+ * @param netif network interface which must reboot
+ */
+static err_t
+dhcp_reboot(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result;
+ u16_t msecs;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot()\n"));
+ dhcp_set_state(dhcp, DHCP_REBOOTING);
+
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_msg(netif, dhcp, DHCP_REQUEST);
+ if (result == ERR_OK) {
+ dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
+ dhcp_option_short(dhcp, 576);
+
+ dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
+ dhcp_option_long(dhcp, ntohl(ip4_addr_get_u32(&dhcp->offered_ip_addr)));
+
+ dhcp_option_trailer(dhcp);
+
+ pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
+
+ /* broadcast to server */
+ udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
+ dhcp_delete_msg(dhcp);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot: REBOOTING\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_reboot: could not allocate DHCP request\n"));
+ }
+ dhcp->tries++;
+ msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_reboot(): set request timeout %"U16_F" msecs\n", msecs));
+ return result;
+}
+
+
+/**
+ * Release a DHCP lease.
+ *
+ * @param netif network interface which must release its lease
+ */
+err_t
+dhcp_release(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result;
+ u16_t msecs;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_release()\n"));
+
+ /* idle DHCP client */
+ dhcp_set_state(dhcp, DHCP_OFF);
+ /* clean old DHCP offer */
+ ip_addr_set_zero(&dhcp->server_ip_addr);
+ ip_addr_set_zero(&dhcp->offered_ip_addr);
+ ip_addr_set_zero(&dhcp->offered_sn_mask);
+ ip_addr_set_zero(&dhcp->offered_gw_addr);
+#if LWIP_DHCP_BOOTP_FILE
+ ip_addr_set_zero(&dhcp->offered_si_addr);
+#endif /* LWIP_DHCP_BOOTP_FILE */
+ dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
+
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_msg(netif, dhcp, DHCP_RELEASE);
+ if (result == ERR_OK) {
+ dhcp_option_trailer(dhcp);
+
+ pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
+
+ udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
+ dhcp_delete_msg(dhcp);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("dhcp_release: could not allocate DHCP request\n"));
+ }
+ dhcp->tries++;
+ msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
+ /* bring the interface down */
+ netif_set_down(netif);
+ /* remove IP address from interface */
+ netif_set_ipaddr(netif, IP_ADDR_ANY);
+ netif_set_gw(netif, IP_ADDR_ANY);
+ netif_set_netmask(netif, IP_ADDR_ANY);
+
+ return result;
+}
+
+/**
+ * Remove the DHCP client from the interface.
+ *
+ * @param netif The network interface to stop DHCP on
+ */
+void
+dhcp_stop(struct netif *netif)
+{
+ struct dhcp *dhcp;
+ LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
+ dhcp = netif->dhcp;
+ /* Remove the flag that says this netif is handled by DHCP. */
+ netif->flags &= ~NETIF_FLAG_DHCP;
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_stop()\n"));
+ /* netif is DHCP configured? */
+ if (dhcp != NULL) {
+#if LWIP_DHCP_AUTOIP_COOP
+ if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
+ autoip_stop(netif);
+ dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
+ }
+#endif /* LWIP_DHCP_AUTOIP_COOP */
+
+ if (dhcp->pcb != NULL) {
+ udp_remove(dhcp->pcb);
+ dhcp->pcb = NULL;
+ }
+ LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
+ dhcp_set_state(dhcp, DHCP_OFF);
+ }
+}
+
+/*
+ * Set the DHCP state of a DHCP client.
+ *
+ * If the state changed, reset the number of tries.
+ */
+static void
+dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
+{
+ if (new_state != dhcp->state) {
+ dhcp->state = new_state;
+ dhcp->tries = 0;
+ dhcp->request_timeout = 0;
+ }
+}
+
+/*
+ * Concatenate an option type and length field to the outgoing
+ * DHCP message.
+ *
+ */
+static void
+dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
+{
+ LWIP_ASSERT("dhcp_option: dhcp->options_out_len + 2 + option_len <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U + option_len <= DHCP_OPTIONS_LEN);
+ dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
+ dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
+}
+/*
+ * Concatenate a single byte to the outgoing DHCP message.
+ *
+ */
+static void
+dhcp_option_byte(struct dhcp *dhcp, u8_t value)
+{
+ LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
+ dhcp->msg_out->options[dhcp->options_out_len++] = value;
+}
+
+static void
+dhcp_option_short(struct dhcp *dhcp, u16_t value)
+{
+ LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
+ dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
+ dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
+}
+
+static void
+dhcp_option_long(struct dhcp *dhcp, u32_t value)
+{
+ LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
+ dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
+ dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
+ dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
+ dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
+}
+
+/**
+ * Extract the DHCP message and the DHCP options.
+ *
+ * Extract the DHCP message and the DHCP options, each into a contiguous
+ * piece of memory. As a DHCP message is variable sized by its options,
+ * and also allows overriding some fields for options, the easy approach
+ * is to first unfold the options into a conitguous piece of memory, and
+ * use that further on.
+ *
+ */
+static err_t
+dhcp_parse_reply(struct dhcp *dhcp, struct pbuf *p)
+{
+ u8_t *options;
+ u16_t offset;
+ u16_t offset_max;
+ u16_t options_idx;
+ u16_t options_idx_max;
+ struct pbuf *q;
+ int parse_file_as_options = 0;
+ int parse_sname_as_options = 0;
+
+ /* clear received options */
+ dhcp_clear_all_options(dhcp);
+ /* check that beginning of dhcp_msg (up to and including chaddr) is in first pbuf */
+ if (p->len < DHCP_SNAME_OFS) {
+ return ERR_BUF;
+ }
+ dhcp->msg_in = (struct dhcp_msg *)p->payload;
+#if LWIP_DHCP_BOOTP_FILE
+ /* clear boot file name */
+ dhcp->boot_file_name[0] = 0;
+#endif /* LWIP_DHCP_BOOTP_FILE */
+
+ /* parse options */
+
+ /* start with options field */
+ options_idx = DHCP_OPTIONS_OFS;
+ /* parse options to the end of the received packet */
+ options_idx_max = p->tot_len;
+again:
+ q = p;
+ while((q != NULL) && (options_idx >= q->len)) {
+ options_idx -= q->len;
+ options_idx_max -= q->len;
+ q = q->next;
+ }
+ if (q == NULL) {
+ return ERR_BUF;
+ }
+ offset = options_idx;
+ offset_max = options_idx_max;
+ options = (u8_t*)q->payload;
+ /* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
+ while((q != NULL) && (options[offset] != DHCP_OPTION_END) && (offset < offset_max)) {
+ u8_t op = options[offset];
+ u8_t len;
+ u8_t decode_len = 0;
+ int decode_idx = -1;
+ u16_t val_offset = offset + 2;
+ /* len byte might be in the next pbuf */
+ if (offset + 1 < q->len) {
+ len = options[offset + 1];
+ } else {
+ len = (q->next != NULL ? ((u8_t*)q->next->payload)[0] : 0);
+ }
+ /* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
+ decode_len = len;
+ switch(op) {
+ /* case(DHCP_OPTION_END): handled above */
+ case(DHCP_OPTION_PAD):
+ /* special option: no len encoded */
+ decode_len = len = 0;
+ /* will be increased below */
+ offset--;
+ break;
+ case(DHCP_OPTION_SUBNET_MASK):
+ LWIP_ASSERT("len == 4", len == 4);
+ decode_idx = DHCP_OPTION_IDX_SUBNET_MASK;
+ break;
+ case(DHCP_OPTION_ROUTER):
+ decode_len = 4; /* only copy the first given router */
+ LWIP_ASSERT("len >= decode_len", len >= decode_len);
+ decode_idx = DHCP_OPTION_IDX_ROUTER;
+ break;
+ case(DHCP_OPTION_DNS_SERVER):
+ /* special case: there might be more than one server */
+ LWIP_ASSERT("len % 4 == 0", len % 4 == 0);
+ /* limit number of DNS servers */
+ decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS);
+ LWIP_ASSERT("len >= decode_len", len >= decode_len);
+ decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
+ break;
+ case(DHCP_OPTION_LEASE_TIME):
+ LWIP_ASSERT("len == 4", len == 4);
+ decode_idx = DHCP_OPTION_IDX_LEASE_TIME;
+ break;
+ case(DHCP_OPTION_OVERLOAD):
+ LWIP_ASSERT("len == 1", len == 1);
+ decode_idx = DHCP_OPTION_IDX_OVERLOAD;
+ break;
+ case(DHCP_OPTION_MESSAGE_TYPE):
+ LWIP_ASSERT("len == 1", len == 1);
+ decode_idx = DHCP_OPTION_IDX_MSG_TYPE;
+ break;
+ case(DHCP_OPTION_SERVER_ID):
+ LWIP_ASSERT("len == 4", len == 4);
+ decode_idx = DHCP_OPTION_IDX_SERVER_ID;
+ break;
+ case(DHCP_OPTION_T1):
+ LWIP_ASSERT("len == 4", len == 4);
+ decode_idx = DHCP_OPTION_IDX_T1;
+ break;
+ case(DHCP_OPTION_T2):
+ LWIP_ASSERT("len == 4", len == 4);
+ decode_idx = DHCP_OPTION_IDX_T2;
+ break;
+ default:
+ decode_len = 0;
+ LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", op));
+ break;
+ }
+ offset += len + 2;
+ if (decode_len > 0) {
+ u32_t value = 0;
+ u16_t copy_len;
+decode_next:
+ LWIP_ASSERT("check decode_idx", decode_idx >= 0 && decode_idx < DHCP_OPTION_IDX_MAX);
+ LWIP_ASSERT("option already decoded", !dhcp_option_given(dhcp, decode_idx));
+ copy_len = LWIP_MIN(decode_len, 4);
+ pbuf_copy_partial(q, &value, copy_len, val_offset);
+ if (decode_len > 4) {
+ /* decode more than one u32_t */
+ LWIP_ASSERT("decode_len % 4 == 0", decode_len % 4 == 0);
+ dhcp_got_option(dhcp, decode_idx);
+ dhcp_set_option_value(dhcp, decode_idx, htonl(value));
+ decode_len -= 4;
+ val_offset += 4;
+ decode_idx++;
+ goto decode_next;
+ } else if (decode_len == 4) {
+ value = ntohl(value);
+ } else {
+ LWIP_ASSERT("invalid decode_len", decode_len == 1);
+ value = ((u8_t*)&value)[0];
+ }
+ dhcp_got_option(dhcp, decode_idx);
+ dhcp_set_option_value(dhcp, decode_idx, value);
+ }
+ if (offset >= q->len) {
+ offset -= q->len;
+ offset_max -= q->len;
+ q = q->next;
+ options = (u8_t*)q->payload;
+ }
+ }
+ /* is this an overloaded message? */
+ if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_OVERLOAD)) {
+ u32_t overload = dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_OVERLOAD);
+ dhcp_clear_option(dhcp, DHCP_OPTION_IDX_OVERLOAD);
+ if (overload == DHCP_OVERLOAD_FILE) {
+ parse_file_as_options = 1;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded file field\n"));
+ } else if (overload == DHCP_OVERLOAD_SNAME) {
+ parse_sname_as_options = 1;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname field\n"));
+ } else if (overload == DHCP_OVERLOAD_SNAME_FILE) {
+ parse_sname_as_options = 1;
+ parse_file_as_options = 1;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("overloaded sname and file field\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("invalid overload option: %d\n", (int)overload));
+ }
+#if LWIP_DHCP_BOOTP_FILE
+ if (!parse_file_as_options) {
+ /* only do this for ACK messages */
+ if (dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE) &&
+ (dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE) == DHCP_ACK))
+ /* copy bootp file name, don't care for sname (server hostname) */
+ pbuf_copy_partial(p, dhcp->boot_file_name, DHCP_FILE_LEN-1, DHCP_FILE_OFS);
+ /* make sure the string is really NULL-terminated */
+ dhcp->boot_file_name[DHCP_FILE_LEN-1] = 0;
+ }
+#endif /* LWIP_DHCP_BOOTP_FILE */
+ }
+ if (parse_file_as_options) {
+ /* if both are overloaded, parse file first and then sname (RFC 2131 ch. 4.1) */
+ parse_file_as_options = 0;
+ options_idx = DHCP_FILE_OFS;
+ options_idx_max = DHCP_FILE_OFS + DHCP_FILE_LEN;
+ goto again;
+ } else if (parse_sname_as_options) {
+ parse_sname_as_options = 0;
+ options_idx = DHCP_SNAME_OFS;
+ options_idx_max = DHCP_SNAME_OFS + DHCP_SNAME_LEN;
+ goto again;
+ }
+ return ERR_OK;
+}
+
+/**
+ * If an incoming DHCP message is in response to us, then trigger the state machine
+ */
+static void
+dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
+{
+ struct netif *netif = (struct netif *)arg;
+ struct dhcp *dhcp = netif->dhcp;
+ struct dhcp_msg *reply_msg = (struct dhcp_msg *)p->payload;
+ u8_t msg_type;
+ u8_t i;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_recv(pbuf = %p) from DHCP server %"U16_F".%"U16_F".%"U16_F".%"U16_F" port %"U16_F"\n", (void*)p,
+ ip4_addr1_16(addr), ip4_addr2_16(addr), ip4_addr3_16(addr), ip4_addr4_16(addr), port));
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
+ /* prevent warnings about unused arguments */
+ LWIP_UNUSED_ARG(pcb);
+ LWIP_UNUSED_ARG(addr);
+ LWIP_UNUSED_ARG(port);
+
+ LWIP_ASSERT("reply wasn't freed", dhcp->msg_in == NULL);
+
+ if (p->len < DHCP_MIN_REPLY_LEN) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP reply message or pbuf too short\n"));
+ goto free_pbuf_and_return;
+ }
+
+ if (reply_msg->op != DHCP_BOOTREPLY) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("not a DHCP reply message, but type %"U16_F"\n", (u16_t)reply_msg->op));
+ goto free_pbuf_and_return;
+ }
+ /* iterate through hardware address and match against DHCP message */
+ for (i = 0; i < netif->hwaddr_len; i++) {
+ if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
+ ("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
+ (u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
+ goto free_pbuf_and_return;
+ }
+ }
+ /* match transaction ID against what we expected */
+ if (ntohl(reply_msg->xid) != dhcp->xid) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
+ ("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
+ goto free_pbuf_and_return;
+ }
+ /* option fields could be unfold? */
+ if (dhcp_parse_reply(dhcp, p) != ERR_OK) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
+ ("problem unfolding DHCP message - too short on memory?\n"));
+ goto free_pbuf_and_return;
+ }
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
+ /* obtain pointer to DHCP message type */
+ if (!dhcp_option_given(dhcp, DHCP_OPTION_IDX_MSG_TYPE)) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
+ goto free_pbuf_and_return;
+ }
+
+ /* read DHCP message type */
+ msg_type = (u8_t)dhcp_get_option_value(dhcp, DHCP_OPTION_IDX_MSG_TYPE);
+ /* message type is DHCP ACK? */
+ if (msg_type == DHCP_ACK) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_ACK received\n"));
+ /* in requesting state? */
+ if (dhcp->state == DHCP_REQUESTING) {
+ dhcp_handle_ack(netif);
+#if DHCP_DOES_ARP_CHECK
+ /* check if the acknowledged lease address is already in use */
+ dhcp_check(netif);
+#else
+ /* bind interface to the acknowledged lease address */
+ dhcp_bind(netif);
+#endif
+ }
+ /* already bound to the given lease address? */
+ else if ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING)) {
+ dhcp_bind(netif);
+ }
+ }
+ /* received a DHCP_NAK in appropriate state? */
+ else if ((msg_type == DHCP_NAK) &&
+ ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REQUESTING) ||
+ (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING ))) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_NAK received\n"));
+ dhcp_handle_nak(netif);
+ }
+ /* received a DHCP_OFFER in DHCP_SELECTING state? */
+ else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
+ dhcp->request_timeout = 0;
+ /* remember offered lease */
+ dhcp_handle_offer(netif);
+ }
+free_pbuf_and_return:
+ dhcp->msg_in = NULL;
+ pbuf_free(p);
+}
+
+/**
+ * Create a DHCP request, fill in common headers
+ *
+ * @param netif the netif under DHCP control
+ * @param dhcp dhcp control struct
+ * @param message_type message type of the request
+ */
+static err_t
+dhcp_create_msg(struct netif *netif, struct dhcp *dhcp, u8_t message_type)
+{
+ u16_t i;
+#ifndef DHCP_GLOBAL_XID
+ /** default global transaction identifier starting value (easy to match
+ * with a packet analyser). We simply increment for each new request.
+ * Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
+ * at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
+ static u32_t xid = 0xABCD0000;
+#else
+ static u32_t xid;
+ static u8_t xid_initialised = 0;
+ if (!xid_initialised) {
+ xid = DHCP_GLOBAL_XID;
+ xid_initialised = !xid_initialised;
+ }
+#endif
+ LWIP_ERROR("dhcp_create_msg: netif != NULL", (netif != NULL), return ERR_ARG;);
+ LWIP_ERROR("dhcp_create_msg: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
+ LWIP_ASSERT("dhcp_create_msg: dhcp->p_out == NULL", dhcp->p_out == NULL);
+ LWIP_ASSERT("dhcp_create_msg: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
+ dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
+ if (dhcp->p_out == NULL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
+ ("dhcp_create_msg(): could not allocate pbuf\n"));
+ return ERR_MEM;
+ }
+ LWIP_ASSERT("dhcp_create_msg: check that first pbuf can hold struct dhcp_msg",
+ (dhcp->p_out->len >= sizeof(struct dhcp_msg)));
+
+ /* reuse transaction identifier in retransmissions */
+ if (dhcp->tries == 0) {
+ xid++;
+ }
+ dhcp->xid = xid;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE,
+ ("transaction id xid(%"X32_F")\n", xid));
+
+ dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
+
+ dhcp->msg_out->op = DHCP_BOOTREQUEST;
+ /* TODO: make link layer independent */
+ dhcp->msg_out->htype = DHCP_HTYPE_ETH;
+ dhcp->msg_out->hlen = netif->hwaddr_len;
+ dhcp->msg_out->hops = 0;
+ dhcp->msg_out->xid = htonl(dhcp->xid);
+ dhcp->msg_out->secs = 0;
+ /* we don't need the broadcast flag since we can receive unicast traffic
+ before being fully configured! */
+ dhcp->msg_out->flags = 0;
+ ip_addr_set_zero(&dhcp->msg_out->ciaddr);
+ /* set ciaddr to netif->ip_addr based on message_type and state */
+ if ((message_type == DHCP_INFORM) || (message_type == DHCP_DECLINE) ||
+ ((message_type == DHCP_REQUEST) && /* DHCP_BOUND not used for sending! */
+ ((dhcp->state==DHCP_RENEWING) || dhcp->state==DHCP_REBINDING))) {
+ ip_addr_copy(dhcp->msg_out->ciaddr, netif->ip_addr);
+ }
+ ip_addr_set_zero(&dhcp->msg_out->yiaddr);
+ ip_addr_set_zero(&dhcp->msg_out->siaddr);
+ ip_addr_set_zero(&dhcp->msg_out->giaddr);
+ for (i = 0; i < DHCP_CHADDR_LEN; i++) {
+ /* copy netif hardware address, pad with zeroes */
+ dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
+ }
+ for (i = 0; i < DHCP_SNAME_LEN; i++) {
+ dhcp->msg_out->sname[i] = 0;
+ }
+ for (i = 0; i < DHCP_FILE_LEN; i++) {
+ dhcp->msg_out->file[i] = 0;
+ }
+ dhcp->msg_out->cookie = PP_HTONL(DHCP_MAGIC_COOKIE);
+ dhcp->options_out_len = 0;
+ /* fill options field with an incrementing array (for debugging purposes) */
+ for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
+ dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
+ }
+ /* Add option MESSAGE_TYPE */
+ dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
+ dhcp_option_byte(dhcp, message_type);
+ return ERR_OK;
+}
+
+/**
+ * Free previously allocated memory used to send a DHCP request.
+ *
+ * @param dhcp the dhcp struct to free the request from
+ */
+static void
+dhcp_delete_msg(struct dhcp *dhcp)
+{
+ LWIP_ERROR("dhcp_delete_msg: dhcp != NULL", (dhcp != NULL), return;);
+ LWIP_ASSERT("dhcp_delete_msg: dhcp->p_out != NULL", dhcp->p_out != NULL);
+ LWIP_ASSERT("dhcp_delete_msg: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
+ if (dhcp->p_out != NULL) {
+ pbuf_free(dhcp->p_out);
+ }
+ dhcp->p_out = NULL;
+ dhcp->msg_out = NULL;
+}
+
+/**
+ * Add a DHCP message trailer
+ *
+ * Adds the END option to the DHCP message, and if
+ * necessary, up to three padding bytes.
+ *
+ * @param dhcp DHCP state structure
+ */
+static void
+dhcp_option_trailer(struct dhcp *dhcp)
+{
+ LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
+ LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
+ LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
+ dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
+ /* packet is too small, or not 4 byte aligned? */
+ while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) || (dhcp->options_out_len & 3)) {
+ /* LWIP_DEBUGF(DHCP_DEBUG,("dhcp_option_trailer:dhcp->options_out_len=%"U16_F", DHCP_OPTIONS_LEN=%"U16_F, dhcp->options_out_len, DHCP_OPTIONS_LEN)); */
+ LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
+ /* add a fill/padding byte */
+ dhcp->msg_out->options[dhcp->options_out_len++] = 0;
+ }
+}
+
+#endif /* LWIP_DHCP */
--- /dev/null
+/**
+ * @file
+ * DNS - host name to IP address resolver.
+ *
+ */
+
+/**
+
+ * This file implements a DNS host name to IP address resolver.
+
+ * Port to lwIP from uIP
+ * by Jim Pettinato April 2007
+
+ * uIP version Copyright (c) 2002-2003, Adam Dunkels.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ * products derived from this software without specific prior
+ * written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *
+ * DNS.C
+ *
+ * The lwIP DNS resolver functions are used to lookup a host name and
+ * map it to a numerical IP address. It maintains a list of resolved
+ * hostnames that can be queried with the dns_lookup() function.
+ * New hostnames can be resolved using the dns_query() function.
+ *
+ * The lwIP version of the resolver also adds a non-blocking version of
+ * gethostbyname() that will work with a raw API application. This function
+ * checks for an IP address string first and converts it if it is valid.
+ * gethostbyname() then does a dns_lookup() to see if the name is
+ * already in the table. If so, the IP is returned. If not, a query is
+ * issued and the function returns with a ERR_INPROGRESS status. The app
+ * using the dns client must then go into a waiting state.
+ *
+ * Once a hostname has been resolved (or found to be non-existent),
+ * the resolver code calls a specified callback function (which
+ * must be implemented by the module that uses the resolver).
+ */
+
+/*-----------------------------------------------------------------------------
+ * RFC 1035 - Domain names - implementation and specification
+ * RFC 2181 - Clarifications to the DNS Specification
+ *----------------------------------------------------------------------------*/
+
+/** @todo: define good default values (rfc compliance) */
+/** @todo: improve answer parsing, more checkings... */
+/** @todo: check RFC1035 - 7.3. Processing responses */
+
+/*-----------------------------------------------------------------------------
+ * Includes
+ *----------------------------------------------------------------------------*/
+
+#include "lwip/opt.h"
+
+#if LWIP_DNS /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/udp.h"
+#include "lwip/mem.h"
+#include "lwip/memp.h"
+#include "lwip/dns.h"
+
+#include <string.h>
+
+/** DNS server IP address */
+#ifndef DNS_SERVER_ADDRESS
+#define DNS_SERVER_ADDRESS(ipaddr) (ip4_addr_set_u32(ipaddr, ipaddr_addr("208.67.222.222"))) /* resolver1.opendns.com */
+#endif
+
+/** DNS server port address */
+#ifndef DNS_SERVER_PORT
+#define DNS_SERVER_PORT 53
+#endif
+
+/** DNS maximum number of retries when asking for a name, before "timeout". */
+#ifndef DNS_MAX_RETRIES
+#define DNS_MAX_RETRIES 4
+#endif
+
+/** DNS resource record max. TTL (one week as default) */
+#ifndef DNS_MAX_TTL
+#define DNS_MAX_TTL 604800
+#endif
+
+/* DNS protocol flags */
+#define DNS_FLAG1_RESPONSE 0x80
+#define DNS_FLAG1_OPCODE_STATUS 0x10
+#define DNS_FLAG1_OPCODE_INVERSE 0x08
+#define DNS_FLAG1_OPCODE_STANDARD 0x00
+#define DNS_FLAG1_AUTHORATIVE 0x04
+#define DNS_FLAG1_TRUNC 0x02
+#define DNS_FLAG1_RD 0x01
+#define DNS_FLAG2_RA 0x80
+#define DNS_FLAG2_ERR_MASK 0x0f
+#define DNS_FLAG2_ERR_NONE 0x00
+#define DNS_FLAG2_ERR_NAME 0x03
+
+/* DNS protocol states */
+#define DNS_STATE_UNUSED 0
+#define DNS_STATE_NEW 1
+#define DNS_STATE_ASKING 2
+#define DNS_STATE_DONE 3
+
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+/** DNS message header */
+struct dns_hdr {
+ PACK_STRUCT_FIELD(u16_t id);
+ PACK_STRUCT_FIELD(u8_t flags1);
+ PACK_STRUCT_FIELD(u8_t flags2);
+ PACK_STRUCT_FIELD(u16_t numquestions);
+ PACK_STRUCT_FIELD(u16_t numanswers);
+ PACK_STRUCT_FIELD(u16_t numauthrr);
+ PACK_STRUCT_FIELD(u16_t numextrarr);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+#define SIZEOF_DNS_HDR 12
+
+/** DNS query message structure.
+ No packing needed: only used locally on the stack. */
+struct dns_query {
+ /* DNS query record starts with either a domain name or a pointer
+ to a name already present somewhere in the packet. */
+ u16_t type;
+ u16_t cls;
+};
+#define SIZEOF_DNS_QUERY 4
+
+/** DNS answer message structure.
+ No packing needed: only used locally on the stack. */
+struct dns_answer {
+ /* DNS answer record starts with either a domain name or a pointer
+ to a name already present somewhere in the packet. */
+ u16_t type;
+ u16_t cls;
+ u32_t ttl;
+ u16_t len;
+};
+#define SIZEOF_DNS_ANSWER 10
+
+/** DNS table entry */
+struct dns_table_entry {
+ u8_t state;
+ u8_t numdns;
+ u8_t tmr;
+ u8_t retries;
+ u8_t seqno;
+ u8_t err;
+ u32_t ttl;
+ char name[DNS_MAX_NAME_LENGTH];
+ ip_addr_t ipaddr;
+ /* pointer to callback on DNS query done */
+ dns_found_callback found;
+ void *arg;
+};
+
+#if DNS_LOCAL_HOSTLIST
+
+#if DNS_LOCAL_HOSTLIST_IS_DYNAMIC
+/** Local host-list. For hostnames in this list, no
+ * external name resolution is performed */
+static struct local_hostlist_entry *local_hostlist_dynamic;
+#else /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
+
+/** Defining this allows the local_hostlist_static to be placed in a different
+ * linker section (e.g. FLASH) */
+#ifndef DNS_LOCAL_HOSTLIST_STORAGE_PRE
+#define DNS_LOCAL_HOSTLIST_STORAGE_PRE static
+#endif /* DNS_LOCAL_HOSTLIST_STORAGE_PRE */
+/** Defining this allows the local_hostlist_static to be placed in a different
+ * linker section (e.g. FLASH) */
+#ifndef DNS_LOCAL_HOSTLIST_STORAGE_POST
+#define DNS_LOCAL_HOSTLIST_STORAGE_POST
+#endif /* DNS_LOCAL_HOSTLIST_STORAGE_POST */
+DNS_LOCAL_HOSTLIST_STORAGE_PRE struct local_hostlist_entry local_hostlist_static[]
+ DNS_LOCAL_HOSTLIST_STORAGE_POST = DNS_LOCAL_HOSTLIST_INIT;
+
+#endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
+
+static void dns_init_local();
+#endif /* DNS_LOCAL_HOSTLIST */
+
+
+/* forward declarations */
+static void dns_recv(void *s, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port);
+static void dns_check_entries(void);
+
+/*-----------------------------------------------------------------------------
+ * Globales
+ *----------------------------------------------------------------------------*/
+
+/* DNS variables */
+static struct udp_pcb *dns_pcb;
+static u8_t dns_seqno;
+static struct dns_table_entry dns_table[DNS_TABLE_SIZE];
+static ip_addr_t dns_servers[DNS_MAX_SERVERS];
+/** Contiguous buffer for processing responses */
+static u8_t dns_payload_buffer[LWIP_MEM_ALIGN_BUFFER(DNS_MSG_SIZE)];
+static u8_t* dns_payload;
+
+/**
+ * Initialize the resolver: set up the UDP pcb and configure the default server
+ * (DNS_SERVER_ADDRESS).
+ */
+void
+dns_init()
+{
+ ip_addr_t dnsserver;
+
+ dns_payload = (u8_t *)LWIP_MEM_ALIGN(dns_payload_buffer);
+
+ /* initialize default DNS server address */
+ DNS_SERVER_ADDRESS(&dnsserver);
+
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_init: initializing\n"));
+
+ /* if dns client not yet initialized... */
+ if (dns_pcb == NULL) {
+ dns_pcb = udp_new();
+
+ if (dns_pcb != NULL) {
+ /* initialize DNS table not needed (initialized to zero since it is a
+ * global variable) */
+ LWIP_ASSERT("For implicit initialization to work, DNS_STATE_UNUSED needs to be 0",
+ DNS_STATE_UNUSED == 0);
+
+ /* initialize DNS client */
+ udp_bind(dns_pcb, IP_ADDR_ANY, 0);
+ udp_recv(dns_pcb, dns_recv, NULL);
+
+ /* initialize default DNS primary server */
+ dns_setserver(0, &dnsserver);
+ }
+ }
+#if DNS_LOCAL_HOSTLIST
+ dns_init_local();
+#endif
+}
+
+/**
+ * Initialize one of the DNS servers.
+ *
+ * @param numdns the index of the DNS server to set must be < DNS_MAX_SERVERS
+ * @param dnsserver IP address of the DNS server to set
+ */
+void
+dns_setserver(u8_t numdns, ip_addr_t *dnsserver)
+{
+ if ((numdns < DNS_MAX_SERVERS) && (dns_pcb != NULL) &&
+ (dnsserver != NULL) && !ip_addr_isany(dnsserver)) {
+ dns_servers[numdns] = (*dnsserver);
+ }
+}
+
+/**
+ * Obtain one of the currently configured DNS server.
+ *
+ * @param numdns the index of the DNS server
+ * @return IP address of the indexed DNS server or "ip_addr_any" if the DNS
+ * server has not been configured.
+ */
+ip_addr_t
+dns_getserver(u8_t numdns)
+{
+ if (numdns < DNS_MAX_SERVERS) {
+ return dns_servers[numdns];
+ } else {
+ return *IP_ADDR_ANY;
+ }
+}
+
+/**
+ * The DNS resolver client timer - handle retries and timeouts and should
+ * be called every DNS_TMR_INTERVAL milliseconds (every second by default).
+ */
+void
+dns_tmr(void)
+{
+ if (dns_pcb != NULL) {
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_tmr: dns_check_entries\n"));
+ dns_check_entries();
+ }
+}
+
+#if DNS_LOCAL_HOSTLIST
+static void
+dns_init_local()
+{
+#if DNS_LOCAL_HOSTLIST_IS_DYNAMIC && defined(DNS_LOCAL_HOSTLIST_INIT)
+ int i;
+ struct local_hostlist_entry *entry;
+ /* Dynamic: copy entries from DNS_LOCAL_HOSTLIST_INIT to list */
+ struct local_hostlist_entry local_hostlist_init[] = DNS_LOCAL_HOSTLIST_INIT;
+ size_t namelen;
+ for (i = 0; i < sizeof(local_hostlist_init) / sizeof(struct local_hostlist_entry); i++) {
+ struct local_hostlist_entry *init_entry = &local_hostlist_init[i];
+ LWIP_ASSERT("invalid host name (NULL)", init_entry->name != NULL);
+ namelen = strlen(init_entry->name);
+ LWIP_ASSERT("namelen <= DNS_LOCAL_HOSTLIST_MAX_NAMELEN", namelen <= DNS_LOCAL_HOSTLIST_MAX_NAMELEN);
+ entry = (struct local_hostlist_entry *)memp_malloc(MEMP_LOCALHOSTLIST);
+ LWIP_ASSERT("mem-error in dns_init_local", entry != NULL);
+ if (entry != NULL) {
+ entry->name = (char*)entry + sizeof(struct local_hostlist_entry);
+ MEMCPY((char*)entry->name, init_entry->name, namelen);
+ ((char*)entry->name)[namelen] = 0;
+ entry->addr = init_entry->addr;
+ entry->next = local_hostlist_dynamic;
+ local_hostlist_dynamic = entry;
+ }
+ }
+#endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC && defined(DNS_LOCAL_HOSTLIST_INIT) */
+}
+
+/**
+ * Scans the local host-list for a hostname.
+ *
+ * @param hostname Hostname to look for in the local host-list
+ * @return The first IP address for the hostname in the local host-list or
+ * IPADDR_NONE if not found.
+ */
+static u32_t
+dns_lookup_local(const char *hostname)
+{
+#if DNS_LOCAL_HOSTLIST_IS_DYNAMIC
+ struct local_hostlist_entry *entry = local_hostlist_dynamic;
+ while(entry != NULL) {
+ if(strcmp(entry->name, hostname) == 0) {
+ return ip4_addr_get_u32(&entry->addr);
+ }
+ entry = entry->next;
+ }
+#else /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
+ int i;
+ for (i = 0; i < sizeof(local_hostlist_static) / sizeof(struct local_hostlist_entry); i++) {
+ if(strcmp(local_hostlist_static[i].name, hostname) == 0) {
+ return ip4_addr_get_u32(&local_hostlist_static[i].addr);
+ }
+ }
+#endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
+ return IPADDR_NONE;
+}
+
+#if DNS_LOCAL_HOSTLIST_IS_DYNAMIC
+/** Remove all entries from the local host-list for a specific hostname
+ * and/or IP addess
+ *
+ * @param hostname hostname for which entries shall be removed from the local
+ * host-list
+ * @param addr address for which entries shall be removed from the local host-list
+ * @return the number of removed entries
+ */
+int
+dns_local_removehost(const char *hostname, const ip_addr_t *addr)
+{
+ int removed = 0;
+ struct local_hostlist_entry *entry = local_hostlist_dynamic;
+ struct local_hostlist_entry *last_entry = NULL;
+ while (entry != NULL) {
+ if (((hostname == NULL) || !strcmp(entry->name, hostname)) &&
+ ((addr == NULL) || ip_addr_cmp(&entry->addr, addr))) {
+ struct local_hostlist_entry *free_entry;
+ if (last_entry != NULL) {
+ last_entry->next = entry->next;
+ } else {
+ local_hostlist_dynamic = entry->next;
+ }
+ free_entry = entry;
+ entry = entry->next;
+ memp_free(MEMP_LOCALHOSTLIST, free_entry);
+ removed++;
+ } else {
+ last_entry = entry;
+ entry = entry->next;
+ }
+ }
+ return removed;
+}
+
+/**
+ * Add a hostname/IP address pair to the local host-list.
+ * Duplicates are not checked.
+ *
+ * @param hostname hostname of the new entry
+ * @param addr IP address of the new entry
+ * @return ERR_OK if succeeded or ERR_MEM on memory error
+ */
+err_t
+dns_local_addhost(const char *hostname, const ip_addr_t *addr)
+{
+ struct local_hostlist_entry *entry;
+ size_t namelen;
+ LWIP_ASSERT("invalid host name (NULL)", hostname != NULL);
+ namelen = strlen(hostname);
+ LWIP_ASSERT("namelen <= DNS_LOCAL_HOSTLIST_MAX_NAMELEN", namelen <= DNS_LOCAL_HOSTLIST_MAX_NAMELEN);
+ entry = (struct local_hostlist_entry *)memp_malloc(MEMP_LOCALHOSTLIST);
+ if (entry == NULL) {
+ return ERR_MEM;
+ }
+ entry->name = (char*)entry + sizeof(struct local_hostlist_entry);
+ MEMCPY((char*)entry->name, hostname, namelen);
+ ((char*)entry->name)[namelen] = 0;
+ ip_addr_copy(entry->addr, *addr);
+ entry->next = local_hostlist_dynamic;
+ local_hostlist_dynamic = entry;
+ return ERR_OK;
+}
+#endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC*/
+#endif /* DNS_LOCAL_HOSTLIST */
+
+/**
+ * Look up a hostname in the array of known hostnames.
+ *
+ * @note This function only looks in the internal array of known
+ * hostnames, it does not send out a query for the hostname if none
+ * was found. The function dns_enqueue() can be used to send a query
+ * for a hostname.
+ *
+ * @param name the hostname to look up
+ * @return the hostname's IP address, as u32_t (instead of ip_addr_t to
+ * better check for failure: != IPADDR_NONE) or IPADDR_NONE if the hostname
+ * was not found in the cached dns_table.
+ */
+static u32_t
+dns_lookup(const char *name)
+{
+ u8_t i;
+#if DNS_LOCAL_HOSTLIST || defined(DNS_LOOKUP_LOCAL_EXTERN)
+ u32_t addr;
+#endif /* DNS_LOCAL_HOSTLIST || defined(DNS_LOOKUP_LOCAL_EXTERN) */
+#if DNS_LOCAL_HOSTLIST
+ if ((addr = dns_lookup_local(name)) != IPADDR_NONE) {
+ return addr;
+ }
+#endif /* DNS_LOCAL_HOSTLIST */
+#ifdef DNS_LOOKUP_LOCAL_EXTERN
+ if((addr = DNS_LOOKUP_LOCAL_EXTERN(name)) != IPADDR_NONE) {
+ return addr;
+ }
+#endif /* DNS_LOOKUP_LOCAL_EXTERN */
+
+ /* Walk through name list, return entry if found. If not, return NULL. */
+ for (i = 0; i < DNS_TABLE_SIZE; ++i) {
+ if ((dns_table[i].state == DNS_STATE_DONE) &&
+ (strcmp(name, dns_table[i].name) == 0)) {
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_lookup: \"%s\": found = ", name));
+ ip_addr_debug_print(DNS_DEBUG, &(dns_table[i].ipaddr));
+ LWIP_DEBUGF(DNS_DEBUG, ("\n"));
+ return ip4_addr_get_u32(&dns_table[i].ipaddr);
+ }
+ }
+
+ return IPADDR_NONE;
+}
+
+#if DNS_DOES_NAME_CHECK
+/**
+ * Compare the "dotted" name "query" with the encoded name "response"
+ * to make sure an answer from the DNS server matches the current dns_table
+ * entry (otherwise, answers might arrive late for hostname not on the list
+ * any more).
+ *
+ * @param query hostname (not encoded) from the dns_table
+ * @param response encoded hostname in the DNS response
+ * @return 0: names equal; 1: names differ
+ */
+static u8_t
+dns_compare_name(unsigned char *query, unsigned char *response)
+{
+ unsigned char n;
+
+ do {
+ n = *response++;
+ /** @see RFC 1035 - 4.1.4. Message compression */
+ if ((n & 0xc0) == 0xc0) {
+ /* Compressed name */
+ break;
+ } else {
+ /* Not compressed name */
+ while (n > 0) {
+ if ((*query) != (*response)) {
+ return 1;
+ }
+ ++response;
+ ++query;
+ --n;
+ };
+ ++query;
+ }
+ } while (*response != 0);
+
+ return 0;
+}
+#endif /* DNS_DOES_NAME_CHECK */
+
+/**
+ * Walk through a compact encoded DNS name and return the end of the name.
+ *
+ * @param query encoded DNS name in the DNS server response
+ * @return end of the name
+ */
+static unsigned char *
+dns_parse_name(unsigned char *query)
+{
+ unsigned char n;
+
+ do {
+ n = *query++;
+ /** @see RFC 1035 - 4.1.4. Message compression */
+ if ((n & 0xc0) == 0xc0) {
+ /* Compressed name */
+ break;
+ } else {
+ /* Not compressed name */
+ while (n > 0) {
+ ++query;
+ --n;
+ };
+ }
+ } while (*query != 0);
+
+ return query + 1;
+}
+
+/**
+ * Send a DNS query packet.
+ *
+ * @param numdns index of the DNS server in the dns_servers table
+ * @param name hostname to query
+ * @param id index of the hostname in dns_table, used as transaction ID in the
+ * DNS query packet
+ * @return ERR_OK if packet is sent; an err_t indicating the problem otherwise
+ */
+static err_t
+dns_send(u8_t numdns, const char* name, u8_t id)
+{
+ err_t err;
+ struct dns_hdr *hdr;
+ struct dns_query qry;
+ struct pbuf *p;
+ char *query, *nptr;
+ const char *pHostname;
+ u8_t n;
+
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_send: dns_servers[%"U16_F"] \"%s\": request\n",
+ (u16_t)(numdns), name));
+ LWIP_ASSERT("dns server out of array", numdns < DNS_MAX_SERVERS);
+ LWIP_ASSERT("dns server has no IP address set", !ip_addr_isany(&dns_servers[numdns]));
+
+ /* if here, we have either a new query or a retry on a previous query to process */
+ p = pbuf_alloc(PBUF_TRANSPORT, SIZEOF_DNS_HDR + DNS_MAX_NAME_LENGTH +
+ SIZEOF_DNS_QUERY, PBUF_RAM);
+ if (p != NULL) {
+ LWIP_ASSERT("pbuf must be in one piece", p->next == NULL);
+ /* fill dns header */
+ hdr = (struct dns_hdr*)p->payload;
+ memset(hdr, 0, SIZEOF_DNS_HDR);
+ hdr->id = htons(id);
+ hdr->flags1 = DNS_FLAG1_RD;
+ hdr->numquestions = PP_HTONS(1);
+ query = (char*)hdr + SIZEOF_DNS_HDR;
+ pHostname = name;
+ --pHostname;
+
+ /* convert hostname into suitable query format. */
+ do {
+ ++pHostname;
+ nptr = query;
+ ++query;
+ for(n = 0; *pHostname != '.' && *pHostname != 0; ++pHostname) {
+ *query = *pHostname;
+ ++query;
+ ++n;
+ }
+ *nptr = n;
+ } while(*pHostname != 0);
+ *query++='\0';
+
+ /* fill dns query */
+ qry.type = PP_HTONS(DNS_RRTYPE_A);
+ qry.cls = PP_HTONS(DNS_RRCLASS_IN);
+ SMEMCPY(query, &qry, SIZEOF_DNS_QUERY);
+
+ /* resize pbuf to the exact dns query */
+ pbuf_realloc(p, (u16_t)((query + SIZEOF_DNS_QUERY) - ((char*)(p->payload))));
+
+ /* connect to the server for faster receiving */
+ udp_connect(dns_pcb, &dns_servers[numdns], DNS_SERVER_PORT);
+ /* send dns packet */
+ err = udp_sendto(dns_pcb, p, &dns_servers[numdns], DNS_SERVER_PORT);
+
+ /* free pbuf */
+ pbuf_free(p);
+ } else {
+ err = ERR_MEM;
+ }
+
+ return err;
+}
+
+/**
+ * dns_check_entry() - see if pEntry has not yet been queried and, if so, sends out a query.
+ * Check an entry in the dns_table:
+ * - send out query for new entries
+ * - retry old pending entries on timeout (also with different servers)
+ * - remove completed entries from the table if their TTL has expired
+ *
+ * @param i index of the dns_table entry to check
+ */
+static void
+dns_check_entry(u8_t i)
+{
+ err_t err;
+ struct dns_table_entry *pEntry = &dns_table[i];
+
+ LWIP_ASSERT("array index out of bounds", i < DNS_TABLE_SIZE);
+
+ switch(pEntry->state) {
+
+ case DNS_STATE_NEW: {
+ /* initialize new entry */
+ pEntry->state = DNS_STATE_ASKING;
+ pEntry->numdns = 0;
+ pEntry->tmr = 1;
+ pEntry->retries = 0;
+
+ /* send DNS packet for this entry */
+ err = dns_send(pEntry->numdns, pEntry->name, i);
+ if (err != ERR_OK) {
+ LWIP_DEBUGF(DNS_DEBUG | LWIP_DBG_LEVEL_WARNING,
+ ("dns_send returned error: %s\n", lwip_strerr(err)));
+ }
+ break;
+ }
+
+ case DNS_STATE_ASKING: {
+ if (--pEntry->tmr == 0) {
+ if (++pEntry->retries == DNS_MAX_RETRIES) {
+ if ((pEntry->numdns+1<DNS_MAX_SERVERS) && !ip_addr_isany(&dns_servers[pEntry->numdns+1])) {
+ /* change of server */
+ pEntry->numdns++;
+ pEntry->tmr = 1;
+ pEntry->retries = 0;
+ break;
+ } else {
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_check_entry: \"%s\": timeout\n", pEntry->name));
+ /* call specified callback function if provided */
+ if (pEntry->found)
+ (*pEntry->found)(pEntry->name, NULL, pEntry->arg);
+ /* flush this entry */
+ pEntry->state = DNS_STATE_UNUSED;
+ pEntry->found = NULL;
+ break;
+ }
+ }
+
+ /* wait longer for the next retry */
+ pEntry->tmr = pEntry->retries;
+
+ /* send DNS packet for this entry */
+ err = dns_send(pEntry->numdns, pEntry->name, i);
+ if (err != ERR_OK) {
+ LWIP_DEBUGF(DNS_DEBUG | LWIP_DBG_LEVEL_WARNING,
+ ("dns_send returned error: %s\n", lwip_strerr(err)));
+ }
+ }
+ break;
+ }
+
+ case DNS_STATE_DONE: {
+ /* if the time to live is nul */
+ if (--pEntry->ttl == 0) {
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_check_entry: \"%s\": flush\n", pEntry->name));
+ /* flush this entry */
+ pEntry->state = DNS_STATE_UNUSED;
+ pEntry->found = NULL;
+ }
+ break;
+ }
+ case DNS_STATE_UNUSED:
+ /* nothing to do */
+ break;
+ default:
+ LWIP_ASSERT("unknown dns_table entry state:", 0);
+ break;
+ }
+}
+
+/**
+ * Call dns_check_entry for each entry in dns_table - check all entries.
+ */
+static void
+dns_check_entries(void)
+{
+ u8_t i;
+
+ for (i = 0; i < DNS_TABLE_SIZE; ++i) {
+ dns_check_entry(i);
+ }
+}
+
+/**
+ * Receive input function for DNS response packets arriving for the dns UDP pcb.
+ *
+ * @params see udp.h
+ */
+static void
+dns_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *addr, u16_t port)
+{
+ u16_t i;
+ char *pHostname;
+ struct dns_hdr *hdr;
+ struct dns_answer ans;
+ struct dns_table_entry *pEntry;
+ u16_t nquestions, nanswers;
+
+ LWIP_UNUSED_ARG(arg);
+ LWIP_UNUSED_ARG(pcb);
+ LWIP_UNUSED_ARG(addr);
+ LWIP_UNUSED_ARG(port);
+
+ /* is the dns message too big ? */
+ if (p->tot_len > DNS_MSG_SIZE) {
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: pbuf too big\n"));
+ /* free pbuf and return */
+ goto memerr;
+ }
+
+ /* is the dns message big enough ? */
+ if (p->tot_len < (SIZEOF_DNS_HDR + SIZEOF_DNS_QUERY + SIZEOF_DNS_ANSWER)) {
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: pbuf too small\n"));
+ /* free pbuf and return */
+ goto memerr;
+ }
+
+ /* copy dns payload inside static buffer for processing */
+ if (pbuf_copy_partial(p, dns_payload, p->tot_len, 0) == p->tot_len) {
+ /* The ID in the DNS header should be our entry into the name table. */
+ hdr = (struct dns_hdr*)dns_payload;
+ i = htons(hdr->id);
+ if (i < DNS_TABLE_SIZE) {
+ pEntry = &dns_table[i];
+ if(pEntry->state == DNS_STATE_ASKING) {
+ /* This entry is now completed. */
+ pEntry->state = DNS_STATE_DONE;
+ pEntry->err = hdr->flags2 & DNS_FLAG2_ERR_MASK;
+
+ /* We only care about the question(s) and the answers. The authrr
+ and the extrarr are simply discarded. */
+ nquestions = htons(hdr->numquestions);
+ nanswers = htons(hdr->numanswers);
+
+ /* Check for error. If so, call callback to inform. */
+ if (((hdr->flags1 & DNS_FLAG1_RESPONSE) == 0) || (pEntry->err != 0) || (nquestions != 1)) {
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": error in flags\n", pEntry->name));
+ /* call callback to indicate error, clean up memory and return */
+ goto responseerr;
+ }
+
+#if DNS_DOES_NAME_CHECK
+ /* Check if the name in the "question" part match with the name in the entry. */
+ if (dns_compare_name((unsigned char *)(pEntry->name), (unsigned char *)dns_payload + SIZEOF_DNS_HDR) != 0) {
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": response not match to query\n", pEntry->name));
+ /* call callback to indicate error, clean up memory and return */
+ goto responseerr;
+ }
+#endif /* DNS_DOES_NAME_CHECK */
+
+ /* Skip the name in the "question" part */
+ pHostname = (char *) dns_parse_name((unsigned char *)dns_payload + SIZEOF_DNS_HDR) + SIZEOF_DNS_QUERY;
+
+ while (nanswers > 0) {
+ /* skip answer resource record's host name */
+ pHostname = (char *) dns_parse_name((unsigned char *)pHostname);
+
+ /* Check for IP address type and Internet class. Others are discarded. */
+ SMEMCPY(&ans, pHostname, SIZEOF_DNS_ANSWER);
+ if((ans.type == PP_HTONS(DNS_RRTYPE_A)) && (ans.cls == PP_HTONS(DNS_RRCLASS_IN)) &&
+ (ans.len == PP_HTONS(sizeof(ip_addr_t))) ) {
+ /* read the answer resource record's TTL, and maximize it if needed */
+ pEntry->ttl = ntohl(ans.ttl);
+ if (pEntry->ttl > DNS_MAX_TTL) {
+ pEntry->ttl = DNS_MAX_TTL;
+ }
+ /* read the IP address after answer resource record's header */
+ SMEMCPY(&(pEntry->ipaddr), (pHostname+SIZEOF_DNS_ANSWER), sizeof(ip_addr_t));
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": response = ", pEntry->name));
+ ip_addr_debug_print(DNS_DEBUG, (&(pEntry->ipaddr)));
+ LWIP_DEBUGF(DNS_DEBUG, ("\n"));
+ /* call specified callback function if provided */
+ if (pEntry->found) {
+ (*pEntry->found)(pEntry->name, &pEntry->ipaddr, pEntry->arg);
+ }
+ /* deallocate memory and return */
+ goto memerr;
+ } else {
+ pHostname = pHostname + SIZEOF_DNS_ANSWER + htons(ans.len);
+ }
+ --nanswers;
+ }
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": error in response\n", pEntry->name));
+ /* call callback to indicate error, clean up memory and return */
+ goto responseerr;
+ }
+ }
+ }
+
+ /* deallocate memory and return */
+ goto memerr;
+
+responseerr:
+ /* ERROR: call specified callback function with NULL as name to indicate an error */
+ if (pEntry->found) {
+ (*pEntry->found)(pEntry->name, NULL, pEntry->arg);
+ }
+ /* flush this entry */
+ pEntry->state = DNS_STATE_UNUSED;
+ pEntry->found = NULL;
+
+memerr:
+ /* free pbuf */
+ pbuf_free(p);
+ return;
+}
+
+/**
+ * Queues a new hostname to resolve and sends out a DNS query for that hostname
+ *
+ * @param name the hostname that is to be queried
+ * @param found a callback founction to be called on success, failure or timeout
+ * @param callback_arg argument to pass to the callback function
+ * @return @return a err_t return code.
+ */
+static err_t
+dns_enqueue(const char *name, dns_found_callback found, void *callback_arg)
+{
+ u8_t i;
+ u8_t lseq, lseqi;
+ struct dns_table_entry *pEntry = NULL;
+ size_t namelen;
+
+ /* search an unused entry, or the oldest one */
+ lseq = lseqi = 0;
+ for (i = 0; i < DNS_TABLE_SIZE; ++i) {
+ pEntry = &dns_table[i];
+ /* is it an unused entry ? */
+ if (pEntry->state == DNS_STATE_UNUSED)
+ break;
+
+ /* check if this is the oldest completed entry */
+ if (pEntry->state == DNS_STATE_DONE) {
+ if ((dns_seqno - pEntry->seqno) > lseq) {
+ lseq = dns_seqno - pEntry->seqno;
+ lseqi = i;
+ }
+ }
+ }
+
+ /* if we don't have found an unused entry, use the oldest completed one */
+ if (i == DNS_TABLE_SIZE) {
+ if ((lseqi >= DNS_TABLE_SIZE) || (dns_table[lseqi].state != DNS_STATE_DONE)) {
+ /* no entry can't be used now, table is full */
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_enqueue: \"%s\": DNS entries table is full\n", name));
+ return ERR_MEM;
+ } else {
+ /* use the oldest completed one */
+ i = lseqi;
+ pEntry = &dns_table[i];
+ }
+ }
+
+ /* use this entry */
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_enqueue: \"%s\": use DNS entry %"U16_F"\n", name, (u16_t)(i)));
+
+ /* fill the entry */
+ pEntry->state = DNS_STATE_NEW;
+ pEntry->seqno = dns_seqno++;
+ pEntry->found = found;
+ pEntry->arg = callback_arg;
+ namelen = LWIP_MIN(strlen(name), DNS_MAX_NAME_LENGTH-1);
+ MEMCPY(pEntry->name, name, namelen);
+ pEntry->name[namelen] = 0;
+
+ /* force to send query without waiting timer */
+ dns_check_entry(i);
+
+ /* dns query is enqueued */
+ return ERR_INPROGRESS;
+}
+
+/**
+ * Resolve a hostname (string) into an IP address.
+ * NON-BLOCKING callback version for use with raw API!!!
+ *
+ * Returns immediately with one of err_t return codes:
+ * - ERR_OK if hostname is a valid IP address string or the host
+ * name is already in the local names table.
+ * - ERR_INPROGRESS enqueue a request to be sent to the DNS server
+ * for resolution if no errors are present.
+ * - ERR_ARG: dns client not initialized or invalid hostname
+ *
+ * @param hostname the hostname that is to be queried
+ * @param addr pointer to a ip_addr_t where to store the address if it is already
+ * cached in the dns_table (only valid if ERR_OK is returned!)
+ * @param found a callback function to be called on success, failure or timeout (only if
+ * ERR_INPROGRESS is returned!)
+ * @param callback_arg argument to pass to the callback function
+ * @return a err_t return code.
+ */
+err_t
+dns_gethostbyname(const char *hostname, ip_addr_t *addr, dns_found_callback found,
+ void *callback_arg)
+{
+ u32_t ipaddr;
+ /* not initialized or no valid server yet, or invalid addr pointer
+ * or invalid hostname or invalid hostname length */
+ if ((dns_pcb == NULL) || (addr == NULL) ||
+ (!hostname) || (!hostname[0]) ||
+ (strlen(hostname) >= DNS_MAX_NAME_LENGTH)) {
+ return ERR_ARG;
+ }
+
+#if LWIP_HAVE_LOOPIF
+ if (strcmp(hostname, "localhost")==0) {
+ ip_addr_set_loopback(addr);
+ return ERR_OK;
+ }
+#endif /* LWIP_HAVE_LOOPIF */
+
+ /* host name already in octet notation? set ip addr and return ERR_OK */
+ ipaddr = ipaddr_addr(hostname);
+ if (ipaddr == IPADDR_NONE) {
+ /* already have this address cached? */
+ ipaddr = dns_lookup(hostname);
+ }
+ if (ipaddr != IPADDR_NONE) {
+ ip4_addr_set_u32(addr, ipaddr);
+ return ERR_OK;
+ }
+
+ /* queue query with specified callback */
+ return dns_enqueue(hostname, found, callback_arg);
+}
+
+#endif /* LWIP_DNS */
--- /dev/null
+/**
+ * @file
+ * Modules initialization
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/init.h"
+#include "lwip/stats.h"
+#include "lwip/sys.h"
+#include "lwip/mem.h"
+#include "lwip/memp.h"
+#include "lwip/pbuf.h"
+#include "lwip/netif.h"
+#include "lwip/sockets.h"
+#include "lwip/ip.h"
+#include "lwip/raw.h"
+#include "lwip/udp.h"
+#include "lwip/tcp_impl.h"
+#include "lwip/snmp_msg.h"
+#include "lwip/autoip.h"
+#include "lwip/igmp.h"
+#include "lwip/dns.h"
+#include "lwip/timers.h"
+#include "netif/etharp.h"
+
+/* Compile-time sanity checks for configuration errors.
+ * These can be done independently of LWIP_DEBUG, without penalty.
+ */
+#ifndef BYTE_ORDER
+ #error "BYTE_ORDER is not defined, you have to define it in your cc.h"
+#endif
+#if (!IP_SOF_BROADCAST && IP_SOF_BROADCAST_RECV)
+ #error "If you want to use broadcast filter per pcb on recv operations, you have to define IP_SOF_BROADCAST=1 in your lwipopts.h"
+#endif
+#if (!LWIP_ARP && ARP_QUEUEING)
+ #error "If you want to use ARP Queueing, you have to define LWIP_ARP=1 in your lwipopts.h"
+#endif
+#if (!LWIP_UDP && LWIP_UDPLITE)
+ #error "If you want to use UDP Lite, you have to define LWIP_UDP=1 in your lwipopts.h"
+#endif
+#if (!LWIP_UDP && LWIP_SNMP)
+ #error "If you want to use SNMP, you have to define LWIP_UDP=1 in your lwipopts.h"
+#endif
+#if (!LWIP_UDP && LWIP_DHCP)
+ #error "If you want to use DHCP, you have to define LWIP_UDP=1 in your lwipopts.h"
+#endif
+#if (!LWIP_UDP && LWIP_IGMP)
+ #error "If you want to use IGMP, you have to define LWIP_UDP=1 in your lwipopts.h"
+#endif
+#if (!LWIP_UDP && LWIP_SNMP)
+ #error "If you want to use SNMP, you have to define LWIP_UDP=1 in your lwipopts.h"
+#endif
+#if (!LWIP_UDP && LWIP_DNS)
+ #error "If you want to use DNS, you have to define LWIP_UDP=1 in your lwipopts.h"
+#endif
+#if (LWIP_ARP && ARP_QUEUEING && (MEMP_NUM_ARP_QUEUE<=0))
+ #error "If you want to use ARP Queueing, you have to define MEMP_NUM_ARP_QUEUE>=1 in your lwipopts.h"
+#endif
+#if (LWIP_RAW && (MEMP_NUM_RAW_PCB<=0))
+ #error "If you want to use RAW, you have to define MEMP_NUM_RAW_PCB>=1 in your lwipopts.h"
+#endif
+#if (LWIP_UDP && (MEMP_NUM_UDP_PCB<=0))
+ #error "If you want to use UDP, you have to define MEMP_NUM_UDP_PCB>=1 in your lwipopts.h"
+#endif
+#if (LWIP_TCP && (MEMP_NUM_TCP_PCB<=0))
+ #error "If you want to use TCP, you have to define MEMP_NUM_TCP_PCB>=1 in your lwipopts.h"
+#endif
+#if (LWIP_TCP && (TCP_WND > 0xffff))
+ #error "If you want to use TCP, TCP_WND must fit in an u16_t, so, you have to reduce it in your lwipopts.h"
+#endif
+#if (LWIP_TCP && (TCP_SND_QUEUELEN > 0xffff))
+ #error "If you want to use TCP, TCP_SND_QUEUELEN must fit in an u16_t, so, you have to reduce it in your lwipopts.h"
+#endif
+#if (LWIP_TCP && (TCP_SND_QUEUELEN < 2))
+ #error "TCP_SND_QUEUELEN must be at least 2 for no-copy TCP writes to work"
+#endif
+#if (LWIP_TCP && ((TCP_MAXRTX > 12) || (TCP_SYNMAXRTX > 12)))
+ #error "If you want to use TCP, TCP_MAXRTX and TCP_SYNMAXRTX must less or equal to 12 (due to tcp_backoff table), so, you have to reduce them in your lwipopts.h"
+#endif
+#if (LWIP_TCP && TCP_LISTEN_BACKLOG && (TCP_DEFAULT_LISTEN_BACKLOG < 0) || (TCP_DEFAULT_LISTEN_BACKLOG > 0xff))
+ #error "If you want to use TCP backlog, TCP_DEFAULT_LISTEN_BACKLOG must fit into an u8_t"
+#endif
+#if (LWIP_IGMP && (MEMP_NUM_IGMP_GROUP<=1))
+ #error "If you want to use IGMP, you have to define MEMP_NUM_IGMP_GROUP>1 in your lwipopts.h"
+#endif
+#if (LWIP_NETIF_API && (NO_SYS==1))
+ #error "If you want to use NETIF API, you have to define NO_SYS=0 in your lwipopts.h"
+#endif
+#if ((LWIP_SOCKET || LWIP_NETCONN) && (NO_SYS==1))
+ #error "If you want to use Sequential API, you have to define NO_SYS=0 in your lwipopts.h"
+#endif
+#if ((LWIP_NETCONN || LWIP_SOCKET) && (MEMP_NUM_TCPIP_MSG_API<=0))
+ #error "If you want to use Sequential API, you have to define MEMP_NUM_TCPIP_MSG_API>=1 in your lwipopts.h"
+#endif
+#if (!LWIP_NETCONN && LWIP_SOCKET)
+ #error "If you want to use Socket API, you have to define LWIP_NETCONN=1 in your lwipopts.h"
+#endif
+#if (((!LWIP_DHCP) || (!LWIP_AUTOIP)) && LWIP_DHCP_AUTOIP_COOP)
+ #error "If you want to use DHCP/AUTOIP cooperation mode, you have to define LWIP_DHCP=1 and LWIP_AUTOIP=1 in your lwipopts.h"
+#endif
+#if (((!LWIP_DHCP) || (!LWIP_ARP)) && DHCP_DOES_ARP_CHECK)
+ #error "If you want to use DHCP ARP checking, you have to define LWIP_DHCP=1 and LWIP_ARP=1 in your lwipopts.h"
+#endif
+#if (!LWIP_ARP && LWIP_AUTOIP)
+ #error "If you want to use AUTOIP, you have to define LWIP_ARP=1 in your lwipopts.h"
+#endif
+#if (LWIP_SNMP && (SNMP_CONCURRENT_REQUESTS<=0))
+ #error "If you want to use SNMP, you have to define SNMP_CONCURRENT_REQUESTS>=1 in your lwipopts.h"
+#endif
+#if (LWIP_SNMP && (SNMP_TRAP_DESTINATIONS<=0))
+ #error "If you want to use SNMP, you have to define SNMP_TRAP_DESTINATIONS>=1 in your lwipopts.h"
+#endif
+#if (LWIP_TCP && ((LWIP_EVENT_API && LWIP_CALLBACK_API) || (!LWIP_EVENT_API && !LWIP_CALLBACK_API)))
+ #error "One and exactly one of LWIP_EVENT_API and LWIP_CALLBACK_API has to be enabled in your lwipopts.h"
+#endif
+/* There must be sufficient timeouts, taking into account requirements of the subsystems. */
+#if LWIP_TIMERS && (MEMP_NUM_SYS_TIMEOUT < (LWIP_TCP + IP_REASSEMBLY + LWIP_ARP + (2*LWIP_DHCP) + LWIP_AUTOIP + LWIP_IGMP + LWIP_DNS + PPP_SUPPORT))
+ #error "MEMP_NUM_SYS_TIMEOUT is too low to accomodate all required timeouts"
+#endif
+#if (IP_REASSEMBLY && (MEMP_NUM_REASSDATA > IP_REASS_MAX_PBUFS))
+ #error "MEMP_NUM_REASSDATA > IP_REASS_MAX_PBUFS doesn't make sense since each struct ip_reassdata must hold 2 pbufs at least!"
+#endif
+#if (MEM_LIBC_MALLOC && MEM_USE_POOLS)
+ #error "MEM_LIBC_MALLOC and MEM_USE_POOLS may not both be simultaneously enabled in your lwipopts.h"
+#endif
+#if (MEM_USE_POOLS && !MEMP_USE_CUSTOM_POOLS)
+ #error "MEM_USE_POOLS requires custom pools (MEMP_USE_CUSTOM_POOLS) to be enabled in your lwipopts.h"
+#endif
+#if (PBUF_POOL_BUFSIZE <= MEM_ALIGNMENT)
+ #error "PBUF_POOL_BUFSIZE must be greater than MEM_ALIGNMENT or the offset may take the full first pbuf"
+#endif
+#if (TCP_QUEUE_OOSEQ && !LWIP_TCP)
+ #error "TCP_QUEUE_OOSEQ requires LWIP_TCP"
+#endif
+#if (DNS_LOCAL_HOSTLIST && !DNS_LOCAL_HOSTLIST_IS_DYNAMIC && !(defined(DNS_LOCAL_HOSTLIST_INIT)))
+ #error "you have to define define DNS_LOCAL_HOSTLIST_INIT {{'host1', 0x123}, {'host2', 0x234}} to initialize DNS_LOCAL_HOSTLIST"
+#endif
+#if PPP_SUPPORT && !PPPOS_SUPPORT & !PPPOE_SUPPORT
+ #error "PPP_SUPPORT needs either PPPOS_SUPPORT or PPPOE_SUPPORT turned on"
+#endif
+#if !LWIP_ETHERNET && (LWIP_ARP || PPPOE_SUPPORT)
+ #error "LWIP_ETHERNET needs to be turned on for LWIP_ARP or PPPOE_SUPPORT"
+#endif
+#if LWIP_IGMP && !defined(LWIP_RAND)
+ #error "When using IGMP, LWIP_RAND() needs to be defined to a random-function returning an u32_t random value"
+#endif
+#if LWIP_TCPIP_CORE_LOCKING_INPUT && !LWIP_TCPIP_CORE_LOCKING
+ #error "When using LWIP_TCPIP_CORE_LOCKING_INPUT, LWIP_TCPIP_CORE_LOCKING must be enabled, too"
+#endif
+#if LWIP_TCP && LWIP_NETIF_TX_SINGLE_PBUF && !TCP_OVERSIZE
+ #error "LWIP_NETIF_TX_SINGLE_PBUF needs TCP_OVERSIZE enabled to create single-pbuf TCP packets"
+#endif
+#if IP_FRAG && IP_FRAG_USES_STATIC_BUF && LWIP_NETIF_TX_SINGLE_PBUF
+ #error "LWIP_NETIF_TX_SINGLE_PBUF does not work with IP_FRAG_USES_STATIC_BUF==1 as that creates pbuf queues"
+#endif
+
+
+/* Compile-time checks for deprecated options.
+ */
+#ifdef MEMP_NUM_TCPIP_MSG
+ #error "MEMP_NUM_TCPIP_MSG option is deprecated. Remove it from your lwipopts.h."
+#endif
+#ifdef MEMP_NUM_API_MSG
+ #error "MEMP_NUM_API_MSG option is deprecated. Remove it from your lwipopts.h."
+#endif
+#ifdef TCP_REXMIT_DEBUG
+ #error "TCP_REXMIT_DEBUG option is deprecated. Remove it from your lwipopts.h."
+#endif
+#ifdef RAW_STATS
+ #error "RAW_STATS option is deprecated. Remove it from your lwipopts.h."
+#endif
+#ifdef ETHARP_QUEUE_FIRST
+ #error "ETHARP_QUEUE_FIRST option is deprecated. Remove it from your lwipopts.h."
+#endif
+#ifdef ETHARP_ALWAYS_INSERT
+ #error "ETHARP_ALWAYS_INSERT option is deprecated. Remove it from your lwipopts.h."
+#endif
+
+#ifdef LWIP_DEBUG
+static void
+lwip_sanity_check(void)
+{
+ /* Warnings */
+#if LWIP_NETCONN
+ if (MEMP_NUM_NETCONN > (MEMP_NUM_TCP_PCB+MEMP_NUM_TCP_PCB_LISTEN+MEMP_NUM_UDP_PCB+MEMP_NUM_RAW_PCB))
+ LWIP_PLATFORM_DIAG(("lwip_sanity_check: WARNING: MEMP_NUM_NETCONN should be less than the sum of MEMP_NUM_{TCP,RAW,UDP}_PCB+MEMP_NUM_TCP_PCB_LISTEN\n"));
+#endif /* LWIP_NETCONN */
+#if LWIP_TCP
+ if (MEMP_NUM_TCP_SEG < TCP_SND_QUEUELEN)
+ LWIP_PLATFORM_DIAG(("lwip_sanity_check: WARNING: MEMP_NUM_TCP_SEG should be at least as big as TCP_SND_QUEUELEN\n"));
+ if (TCP_SND_BUF < 2 * TCP_MSS)
+ LWIP_PLATFORM_DIAG(("lwip_sanity_check: WARNING: TCP_SND_BUF must be at least as much as (2 * TCP_MSS) for things to work smoothly\n"));
+ if (TCP_SND_QUEUELEN < (2 * (TCP_SND_BUF/TCP_MSS)))
+ LWIP_PLATFORM_DIAG(("lwip_sanity_check: WARNING: TCP_SND_QUEUELEN must be at least as much as (2 * TCP_SND_BUF/TCP_MSS) for things to work\n"));
+ if (TCP_SNDLOWAT >= TCP_SND_BUF)
+ LWIP_PLATFORM_DIAG(("lwip_sanity_check: WARNING: TCP_SNDLOWAT must be less than TCP_SND_BUF.\n"));
+ if (TCP_SNDQUEUELOWAT >= TCP_SND_QUEUELEN)
+ LWIP_PLATFORM_DIAG(("lwip_sanity_check: WARNING: TCP_SNDQUEUELOWAT must be less than TCP_SND_QUEUELEN.\n"));
+ if (TCP_WND > (PBUF_POOL_SIZE*PBUF_POOL_BUFSIZE))
+ LWIP_PLATFORM_DIAG(("lwip_sanity_check: WARNING: TCP_WND is larger than space provided by PBUF_POOL_SIZE*PBUF_POOL_BUFSIZE\n"));
+ if (TCP_WND < TCP_MSS)
+ LWIP_PLATFORM_DIAG(("lwip_sanity_check: WARNING: TCP_WND is smaller than MSS\n"));
+#endif /* LWIP_TCP */
+#if LWIP_SOCKET
+ /* Check that the SO_* socket options and SOF_* lwIP-internal flags match */
+ if (SO_ACCEPTCONN != SOF_ACCEPTCONN)
+ LWIP_PLATFORM_DIAG(("lwip_sanity_check: WARNING: SO_ACCEPTCONN != SOF_ACCEPTCONN\n"));
+ if (SO_REUSEADDR != SOF_REUSEADDR)
+ LWIP_PLATFORM_DIAG(("lwip_sanity_check: WARNING: SO_REUSEADDR != SOF_REUSEADDR\n"));
+ if (SO_KEEPALIVE != SOF_KEEPALIVE)
+ LWIP_PLATFORM_DIAG(("lwip_sanity_check: WARNING: SO_KEEPALIVE != SOF_KEEPALIVE\n"));
+ if (SO_BROADCAST != SOF_BROADCAST)
+ LWIP_PLATFORM_DIAG(("lwip_sanity_check: WARNING: SO_BROADCAST != SOF_BROADCAST\n"));
+ if (SO_LINGER != SOF_LINGER)
+ LWIP_PLATFORM_DIAG(("lwip_sanity_check: WARNING: SO_LINGER != SOF_LINGER\n"));
+#endif /* LWIP_SOCKET */
+}
+#else /* LWIP_DEBUG */
+#define lwip_sanity_check()
+#endif /* LWIP_DEBUG */
+
+/**
+ * Perform Sanity check of user-configurable values, and initialize all modules.
+ */
+void
+lwip_init(void)
+{
+ /* Sanity check user-configurable values */
+ lwip_sanity_check();
+
+ /* Modules initialization */
+ stats_init();
+#if !NO_SYS
+ sys_init();
+#endif /* !NO_SYS */
+ mem_init();
+ memp_init();
+ pbuf_init();
+ netif_init();
+#if LWIP_SOCKET
+ lwip_socket_init();
+#endif /* LWIP_SOCKET */
+ ip_init();
+#if LWIP_ARP
+ etharp_init();
+#endif /* LWIP_ARP */
+#if LWIP_RAW
+ raw_init();
+#endif /* LWIP_RAW */
+#if LWIP_UDP
+ udp_init();
+#endif /* LWIP_UDP */
+#if LWIP_TCP
+ tcp_init();
+#endif /* LWIP_TCP */
+#if LWIP_SNMP
+ snmp_init();
+#endif /* LWIP_SNMP */
+#if LWIP_AUTOIP
+ autoip_init();
+#endif /* LWIP_AUTOIP */
+#if LWIP_IGMP
+ igmp_init();
+#endif /* LWIP_IGMP */
+#if LWIP_DNS
+ dns_init();
+#endif /* LWIP_DNS */
+
+#if LWIP_TIMERS
+ sys_timeouts_init();
+#endif /* LWIP_TIMERS */
+}
--- /dev/null
+/**
+ * @file
+ * AutoIP Automatic LinkLocal IP Configuration
+ *
+ */
+
+/*
+ *
+ * Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * Author: Dominik Spies <kontakt@dspies.de>
+ *
+ * This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
+ * with RFC 3927.
+ *
+ *
+ * Please coordinate changes and requests with Dominik Spies
+ * <kontakt@dspies.de>
+ */
+
+/*******************************************************************************
+ * USAGE:
+ *
+ * define LWIP_AUTOIP 1 in your lwipopts.h
+ *
+ * If you don't use tcpip.c (so, don't call, you don't call tcpip_init):
+ * - First, call autoip_init().
+ * - call autoip_tmr() all AUTOIP_TMR_INTERVAL msces,
+ * that should be defined in autoip.h.
+ * I recommend a value of 100. The value must divide 1000 with a remainder almost 0.
+ * Possible values are 1000, 500, 333, 250, 200, 166, 142, 125, 111, 100 ....
+ *
+ * Without DHCP:
+ * - Call autoip_start() after netif_add().
+ *
+ * With DHCP:
+ * - define LWIP_DHCP_AUTOIP_COOP 1 in your lwipopts.h.
+ * - Configure your DHCP Client.
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/mem.h"
+#include "lwip/udp.h"
+#include "lwip/ip_addr.h"
+#include "lwip/netif.h"
+#include "lwip/autoip.h"
+#include "netif/etharp.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+/* 169.254.0.0 */
+#define AUTOIP_NET 0xA9FE0000
+/* 169.254.1.0 */
+#define AUTOIP_RANGE_START (AUTOIP_NET | 0x0100)
+/* 169.254.254.255 */
+#define AUTOIP_RANGE_END (AUTOIP_NET | 0xFEFF)
+
+
+/** Pseudo random macro based on netif informations.
+ * You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */
+#ifndef LWIP_AUTOIP_RAND
+#define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) | \
+ ((u32_t)((netif->hwaddr[3]) & 0xff) << 16) | \
+ ((u32_t)((netif->hwaddr[2]) & 0xff) << 8) | \
+ ((u32_t)((netif->hwaddr[4]) & 0xff))) + \
+ (netif->autoip?netif->autoip->tried_llipaddr:0))
+#endif /* LWIP_AUTOIP_RAND */
+
+/**
+ * Macro that generates the initial IP address to be tried by AUTOIP.
+ * If you want to override this, define it to something else in lwipopts.h.
+ */
+#ifndef LWIP_AUTOIP_CREATE_SEED_ADDR
+#define LWIP_AUTOIP_CREATE_SEED_ADDR(netif) \
+ htonl(AUTOIP_RANGE_START + ((u32_t)(((u8_t)(netif->hwaddr[4])) | \
+ ((u32_t)((u8_t)(netif->hwaddr[5]))) << 8)))
+#endif /* LWIP_AUTOIP_CREATE_SEED_ADDR */
+
+/* static functions */
+static void autoip_handle_arp_conflict(struct netif *netif);
+
+/* creates a pseudo random LL IP-Address for a network interface */
+static void autoip_create_addr(struct netif *netif, ip_addr_t *ipaddr);
+
+/* sends an ARP probe */
+static err_t autoip_arp_probe(struct netif *netif);
+
+/* sends an ARP announce */
+static err_t autoip_arp_announce(struct netif *netif);
+
+/* configure interface for use with current LL IP-Address */
+static err_t autoip_bind(struct netif *netif);
+
+/* start sending probes for llipaddr */
+static void autoip_start_probing(struct netif *netif);
+
+/**
+ * Initialize this module
+ */
+void
+autoip_init(void)
+{
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_init()\n"));
+}
+
+/** Set a statically allocated struct autoip to work with.
+ * Using this prevents autoip_start to allocate it using mem_malloc.
+ *
+ * @param netif the netif for which to set the struct autoip
+ * @param dhcp (uninitialised) dhcp struct allocated by the application
+ */
+void
+autoip_set_struct(struct netif *netif, struct autoip *autoip)
+{
+ LWIP_ASSERT("netif != NULL", netif != NULL);
+ LWIP_ASSERT("autoip != NULL", autoip != NULL);
+ LWIP_ASSERT("netif already has a struct autoip set", netif->autoip == NULL);
+
+ /* clear data structure */
+ memset(autoip, 0, sizeof(struct autoip));
+ /* autoip->state = AUTOIP_STATE_OFF; */
+ netif->autoip = autoip;
+}
+
+/** Restart AutoIP client and check the next address (conflict detected)
+ *
+ * @param netif The netif under AutoIP control
+ */
+static void
+autoip_restart(struct netif *netif)
+{
+ netif->autoip->tried_llipaddr++;
+ autoip_start(netif);
+}
+
+/**
+ * Handle a IP address conflict after an ARP conflict detection
+ */
+static void
+autoip_handle_arp_conflict(struct netif *netif)
+{
+ /* Somehow detect if we are defending or retreating */
+ unsigned char defend = 1; /* tbd */
+
+ if(defend) {
+ if(netif->autoip->lastconflict > 0) {
+ /* retreat, there was a conflicting ARP in the last
+ * DEFEND_INTERVAL seconds
+ */
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+ ("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n"));
+
+ /* TODO: close all TCP sessions */
+ autoip_restart(netif);
+ } else {
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+ ("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n"));
+ autoip_arp_announce(netif);
+ netif->autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND;
+ }
+ } else {
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+ ("autoip_handle_arp_conflict(): we do not defend, retreating\n"));
+ /* TODO: close all TCP sessions */
+ autoip_restart(netif);
+ }
+}
+
+/**
+ * Create an IP-Address out of range 169.254.1.0 to 169.254.254.255
+ *
+ * @param netif network interface on which create the IP-Address
+ * @param ipaddr ip address to initialize
+ */
+static void
+autoip_create_addr(struct netif *netif, ip_addr_t *ipaddr)
+{
+ /* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255
+ * compliant to RFC 3927 Section 2.1
+ * We have 254 * 256 possibilities */
+
+ u32_t addr = ntohl(LWIP_AUTOIP_CREATE_SEED_ADDR(netif));
+ addr += netif->autoip->tried_llipaddr;
+ addr = AUTOIP_NET | (addr & 0xffff);
+ /* Now, 169.254.0.0 <= addr <= 169.254.255.255 */
+
+ if (addr < AUTOIP_RANGE_START) {
+ addr += AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
+ }
+ if (addr > AUTOIP_RANGE_END) {
+ addr -= AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
+ }
+ LWIP_ASSERT("AUTOIP address not in range", (addr >= AUTOIP_RANGE_START) &&
+ (addr <= AUTOIP_RANGE_END));
+ ip4_addr_set_u32(ipaddr, htonl(addr));
+
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+ ("autoip_create_addr(): tried_llipaddr=%"U16_F", %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ (u16_t)(netif->autoip->tried_llipaddr), ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr),
+ ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
+}
+
+/**
+ * Sends an ARP probe from a network interface
+ *
+ * @param netif network interface used to send the probe
+ */
+static err_t
+autoip_arp_probe(struct netif *netif)
+{
+ return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, ðbroadcast,
+ (struct eth_addr *)netif->hwaddr, IP_ADDR_ANY, ðzero,
+ &netif->autoip->llipaddr, ARP_REQUEST);
+}
+
+/**
+ * Sends an ARP announce from a network interface
+ *
+ * @param netif network interface used to send the announce
+ */
+static err_t
+autoip_arp_announce(struct netif *netif)
+{
+ return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, ðbroadcast,
+ (struct eth_addr *)netif->hwaddr, &netif->autoip->llipaddr, ðzero,
+ &netif->autoip->llipaddr, ARP_REQUEST);
+}
+
+/**
+ * Configure interface for use with current LL IP-Address
+ *
+ * @param netif network interface to configure with current LL IP-Address
+ */
+static err_t
+autoip_bind(struct netif *netif)
+{
+ struct autoip *autoip = netif->autoip;
+ ip_addr_t sn_mask, gw_addr;
+
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
+ ("autoip_bind(netif=%p) %c%c%"U16_F" %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num,
+ ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
+ ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
+
+ IP4_ADDR(&sn_mask, 255, 255, 0, 0);
+ IP4_ADDR(&gw_addr, 0, 0, 0, 0);
+
+ netif_set_ipaddr(netif, &autoip->llipaddr);
+ netif_set_netmask(netif, &sn_mask);
+ netif_set_gw(netif, &gw_addr);
+
+ /* bring the interface up */
+ netif_set_up(netif);
+
+ return ERR_OK;
+}
+
+/**
+ * Start AutoIP client
+ *
+ * @param netif network interface on which start the AutoIP client
+ */
+err_t
+autoip_start(struct netif *netif)
+{
+ struct autoip *autoip = netif->autoip;
+ err_t result = ERR_OK;
+
+ if(netif_is_up(netif)) {
+ netif_set_down(netif);
+ }
+
+ /* Set IP-Address, Netmask and Gateway to 0 to make sure that
+ * ARP Packets are formed correctly
+ */
+ ip_addr_set_zero(&netif->ip_addr);
+ ip_addr_set_zero(&netif->netmask);
+ ip_addr_set_zero(&netif->gw);
+
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+ ("autoip_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0],
+ netif->name[1], (u16_t)netif->num));
+ if(autoip == NULL) {
+ /* no AutoIP client attached yet? */
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
+ ("autoip_start(): starting new AUTOIP client\n"));
+ autoip = (struct autoip *)mem_malloc(sizeof(struct autoip));
+ if(autoip == NULL) {
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
+ ("autoip_start(): could not allocate autoip\n"));
+ return ERR_MEM;
+ }
+ memset(autoip, 0, sizeof(struct autoip));
+ /* store this AutoIP client in the netif */
+ netif->autoip = autoip;
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_start(): allocated autoip"));
+ } else {
+ autoip->state = AUTOIP_STATE_OFF;
+ autoip->ttw = 0;
+ autoip->sent_num = 0;
+ ip_addr_set_zero(&autoip->llipaddr);
+ autoip->lastconflict = 0;
+ }
+
+ autoip_create_addr(netif, &(autoip->llipaddr));
+ autoip_start_probing(netif);
+
+ return result;
+}
+
+static void
+autoip_start_probing(struct netif *netif)
+{
+ struct autoip *autoip = netif->autoip;
+
+ autoip->state = AUTOIP_STATE_PROBING;
+ autoip->sent_num = 0;
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+ ("autoip_start_probing(): changing state to PROBING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
+ ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
+
+ /* time to wait to first probe, this is randomly
+ * choosen out of 0 to PROBE_WAIT seconds.
+ * compliant to RFC 3927 Section 2.2.1
+ */
+ autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND));
+
+ /*
+ * if we tried more then MAX_CONFLICTS we must limit our rate for
+ * accquiring and probing address
+ * compliant to RFC 3927 Section 2.2.1
+ */
+ if(autoip->tried_llipaddr > MAX_CONFLICTS) {
+ autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND;
+ }
+}
+
+/**
+ * Handle a possible change in the network configuration.
+ *
+ * If there is an AutoIP address configured, take the interface down
+ * and begin probing with the same address.
+ */
+void
+autoip_network_changed(struct netif *netif)
+{
+ if (netif->autoip && netif->autoip->state != AUTOIP_STATE_OFF) {
+ netif_set_down(netif);
+ autoip_start_probing(netif);
+ }
+}
+
+/**
+ * Stop AutoIP client
+ *
+ * @param netif network interface on which stop the AutoIP client
+ */
+err_t
+autoip_stop(struct netif *netif)
+{
+ netif->autoip->state = AUTOIP_STATE_OFF;
+ netif_set_down(netif);
+ return ERR_OK;
+}
+
+/**
+ * Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds
+ */
+void
+autoip_tmr()
+{
+ struct netif *netif = netif_list;
+ /* loop through netif's */
+ while (netif != NULL) {
+ /* only act on AutoIP configured interfaces */
+ if (netif->autoip != NULL) {
+ if(netif->autoip->lastconflict > 0) {
+ netif->autoip->lastconflict--;
+ }
+
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
+ ("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n",
+ (u16_t)(netif->autoip->state), netif->autoip->ttw));
+
+ switch(netif->autoip->state) {
+ case AUTOIP_STATE_PROBING:
+ if(netif->autoip->ttw > 0) {
+ netif->autoip->ttw--;
+ } else {
+ if(netif->autoip->sent_num >= PROBE_NUM) {
+ netif->autoip->state = AUTOIP_STATE_ANNOUNCING;
+ netif->autoip->sent_num = 0;
+ netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND;
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+ ("autoip_tmr(): changing state to ANNOUNCING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
+ ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
+ } else {
+ autoip_arp_probe(netif);
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
+ ("autoip_tmr() PROBING Sent Probe\n"));
+ netif->autoip->sent_num++;
+ /* calculate time to wait to next probe */
+ netif->autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) %
+ ((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) +
+ PROBE_MIN * AUTOIP_TICKS_PER_SECOND);
+ }
+ }
+ break;
+
+ case AUTOIP_STATE_ANNOUNCING:
+ if(netif->autoip->ttw > 0) {
+ netif->autoip->ttw--;
+ } else {
+ if(netif->autoip->sent_num == 0) {
+ /* We are here the first time, so we waited ANNOUNCE_WAIT seconds
+ * Now we can bind to an IP address and use it.
+ *
+ * autoip_bind calls netif_set_up. This triggers a gratuitous ARP
+ * which counts as an announcement.
+ */
+ autoip_bind(netif);
+ } else {
+ autoip_arp_announce(netif);
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
+ ("autoip_tmr() ANNOUNCING Sent Announce\n"));
+ }
+ netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND;
+ netif->autoip->sent_num++;
+
+ if(netif->autoip->sent_num >= ANNOUNCE_NUM) {
+ netif->autoip->state = AUTOIP_STATE_BOUND;
+ netif->autoip->sent_num = 0;
+ netif->autoip->ttw = 0;
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+ ("autoip_tmr(): changing state to BOUND: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ ip4_addr1_16(&netif->autoip->llipaddr), ip4_addr2_16(&netif->autoip->llipaddr),
+ ip4_addr3_16(&netif->autoip->llipaddr), ip4_addr4_16(&netif->autoip->llipaddr)));
+ }
+ }
+ break;
+ }
+ }
+ /* proceed to next network interface */
+ netif = netif->next;
+ }
+}
+
+/**
+ * Handles every incoming ARP Packet, called by etharp_arp_input.
+ *
+ * @param netif network interface to use for autoip processing
+ * @param hdr Incoming ARP packet
+ */
+void
+autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr)
+{
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_arp_reply()\n"));
+ if ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) {
+ /* when ip.src == llipaddr && hw.src != netif->hwaddr
+ *
+ * when probing ip.dst == llipaddr && hw.src != netif->hwaddr
+ * we have a conflict and must solve it
+ */
+ ip_addr_t sipaddr, dipaddr;
+ struct eth_addr netifaddr;
+ ETHADDR16_COPY(netifaddr.addr, netif->hwaddr);
+
+ /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
+ * structure packing (not using structure copy which breaks strict-aliasing rules).
+ */
+ IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
+ IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
+
+ if ((netif->autoip->state == AUTOIP_STATE_PROBING) ||
+ ((netif->autoip->state == AUTOIP_STATE_ANNOUNCING) &&
+ (netif->autoip->sent_num == 0))) {
+ /* RFC 3927 Section 2.2.1:
+ * from beginning to after ANNOUNCE_WAIT
+ * seconds we have a conflict if
+ * ip.src == llipaddr OR
+ * ip.dst == llipaddr && hw.src != own hwaddr
+ */
+ if ((ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr)) ||
+ (ip_addr_cmp(&dipaddr, &netif->autoip->llipaddr) &&
+ !eth_addr_cmp(&netifaddr, &hdr->shwaddr))) {
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
+ ("autoip_arp_reply(): Probe Conflict detected\n"));
+ autoip_restart(netif);
+ }
+ } else {
+ /* RFC 3927 Section 2.5:
+ * in any state we have a conflict if
+ * ip.src == llipaddr && hw.src != own hwaddr
+ */
+ if (ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr) &&
+ !eth_addr_cmp(&netifaddr, &hdr->shwaddr)) {
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
+ ("autoip_arp_reply(): Conflicting ARP-Packet detected\n"));
+ autoip_handle_arp_conflict(netif);
+ }
+ }
+ }
+}
+
+#endif /* LWIP_AUTOIP */
--- /dev/null
+/**
+ * @file
+ * ICMP - Internet Control Message Protocol
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+/* Some ICMP messages should be passed to the transport protocols. This
+ is not implemented. */
+
+#include "lwip/opt.h"
+
+#if LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/icmp.h"
+#include "lwip/inet_chksum.h"
+#include "lwip/ip.h"
+#include "lwip/def.h"
+#include "lwip/stats.h"
+#include "lwip/snmp.h"
+
+#include <string.h>
+
+/** Small optimization: set to 0 if incoming PBUF_POOL pbuf always can be
+ * used to modify and send a response packet (and to 1 if this is not the case,
+ * e.g. when link header is stripped of when receiving) */
+#ifndef LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
+#define LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN 1
+#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
+
+/* The amount of data from the original packet to return in a dest-unreachable */
+#define ICMP_DEST_UNREACH_DATASIZE 8
+
+static void icmp_send_response(struct pbuf *p, u8_t type, u8_t code);
+
+/**
+ * Processes ICMP input packets, called from ip_input().
+ *
+ * Currently only processes icmp echo requests and sends
+ * out the echo response.
+ *
+ * @param p the icmp echo request packet, p->payload pointing to the ip header
+ * @param inp the netif on which this packet was received
+ */
+void
+icmp_input(struct pbuf *p, struct netif *inp)
+{
+ u8_t type;
+#ifdef LWIP_DEBUG
+ u8_t code;
+#endif /* LWIP_DEBUG */
+ struct icmp_echo_hdr *iecho;
+ struct ip_hdr *iphdr;
+ s16_t hlen;
+
+ ICMP_STATS_INC(icmp.recv);
+ snmp_inc_icmpinmsgs();
+
+
+ iphdr = (struct ip_hdr *)p->payload;
+ hlen = IPH_HL(iphdr) * 4;
+ if (pbuf_header(p, -hlen) || (p->tot_len < sizeof(u16_t)*2)) {
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: short ICMP (%"U16_F" bytes) received\n", p->tot_len));
+ goto lenerr;
+ }
+
+ type = *((u8_t *)p->payload);
+#ifdef LWIP_DEBUG
+ code = *(((u8_t *)p->payload)+1);
+#endif /* LWIP_DEBUG */
+ switch (type) {
+ case ICMP_ER:
+ /* This is OK, echo reply might have been parsed by a raw PCB
+ (as obviously, an echo request has been sent, too). */
+ break;
+ case ICMP_ECHO:
+#if !LWIP_MULTICAST_PING || !LWIP_BROADCAST_PING
+ {
+ int accepted = 1;
+#if !LWIP_MULTICAST_PING
+ /* multicast destination address? */
+ if (ip_addr_ismulticast(¤t_iphdr_dest)) {
+ accepted = 0;
+ }
+#endif /* LWIP_MULTICAST_PING */
+#if !LWIP_BROADCAST_PING
+ /* broadcast destination address? */
+ if (ip_addr_isbroadcast(¤t_iphdr_dest, inp)) {
+ accepted = 0;
+ }
+#endif /* LWIP_BROADCAST_PING */
+ /* broadcast or multicast destination address not acceptd? */
+ if (!accepted) {
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: Not echoing to multicast or broadcast pings\n"));
+ ICMP_STATS_INC(icmp.err);
+ pbuf_free(p);
+ return;
+ }
+ }
+#endif /* !LWIP_MULTICAST_PING || !LWIP_BROADCAST_PING */
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ping\n"));
+ if (p->tot_len < sizeof(struct icmp_echo_hdr)) {
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: bad ICMP echo received\n"));
+ goto lenerr;
+ }
+ if (inet_chksum_pbuf(p) != 0) {
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: checksum failed for received ICMP echo\n"));
+ pbuf_free(p);
+ ICMP_STATS_INC(icmp.chkerr);
+ snmp_inc_icmpinerrors();
+ return;
+ }
+#if LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
+ if (pbuf_header(p, (PBUF_IP_HLEN + PBUF_LINK_HLEN))) {
+ /* p is not big enough to contain link headers
+ * allocate a new one and copy p into it
+ */
+ struct pbuf *r;
+ /* switch p->payload to ip header */
+ if (pbuf_header(p, hlen)) {
+ LWIP_ASSERT("icmp_input: moving p->payload to ip header failed\n", 0);
+ goto memerr;
+ }
+ /* allocate new packet buffer with space for link headers */
+ r = pbuf_alloc(PBUF_LINK, p->tot_len, PBUF_RAM);
+ if (r == NULL) {
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: allocating new pbuf failed\n"));
+ goto memerr;
+ }
+ LWIP_ASSERT("check that first pbuf can hold struct the ICMP header",
+ (r->len >= hlen + sizeof(struct icmp_echo_hdr)));
+ /* copy the whole packet including ip header */
+ if (pbuf_copy(r, p) != ERR_OK) {
+ LWIP_ASSERT("icmp_input: copying to new pbuf failed\n", 0);
+ goto memerr;
+ }
+ iphdr = (struct ip_hdr *)r->payload;
+ /* switch r->payload back to icmp header */
+ if (pbuf_header(r, -hlen)) {
+ LWIP_ASSERT("icmp_input: restoring original p->payload failed\n", 0);
+ goto memerr;
+ }
+ /* free the original p */
+ pbuf_free(p);
+ /* we now have an identical copy of p that has room for link headers */
+ p = r;
+ } else {
+ /* restore p->payload to point to icmp header */
+ if (pbuf_header(p, -(s16_t)(PBUF_IP_HLEN + PBUF_LINK_HLEN))) {
+ LWIP_ASSERT("icmp_input: restoring original p->payload failed\n", 0);
+ goto memerr;
+ }
+ }
+#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
+ /* At this point, all checks are OK. */
+ /* We generate an answer by switching the dest and src ip addresses,
+ * setting the icmp type to ECHO_RESPONSE and updating the checksum. */
+ iecho = (struct icmp_echo_hdr *)p->payload;
+ ip_addr_copy(iphdr->src, *ip_current_dest_addr());
+ ip_addr_copy(iphdr->dest, *ip_current_src_addr());
+ ICMPH_TYPE_SET(iecho, ICMP_ER);
+ /* adjust the checksum */
+ if (iecho->chksum >= PP_HTONS(0xffffU - (ICMP_ECHO << 8))) {
+ iecho->chksum += PP_HTONS(ICMP_ECHO << 8) + 1;
+ } else {
+ iecho->chksum += PP_HTONS(ICMP_ECHO << 8);
+ }
+
+ /* Set the correct TTL and recalculate the header checksum. */
+ IPH_TTL_SET(iphdr, ICMP_TTL);
+ IPH_CHKSUM_SET(iphdr, 0);
+#if CHECKSUM_GEN_IP
+ IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, IP_HLEN));
+#endif /* CHECKSUM_GEN_IP */
+
+ ICMP_STATS_INC(icmp.xmit);
+ /* increase number of messages attempted to send */
+ snmp_inc_icmpoutmsgs();
+ /* increase number of echo replies attempted to send */
+ snmp_inc_icmpoutechoreps();
+
+ if(pbuf_header(p, hlen)) {
+ LWIP_ASSERT("Can't move over header in packet", 0);
+ } else {
+ err_t ret;
+ /* send an ICMP packet, src addr is the dest addr of the curren packet */
+ ret = ip_output_if(p, ip_current_dest_addr(), IP_HDRINCL,
+ ICMP_TTL, 0, IP_PROTO_ICMP, inp);
+ if (ret != ERR_OK) {
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ip_output_if returned an error: %c.\n", ret));
+ }
+ }
+ break;
+ default:
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ICMP type %"S16_F" code %"S16_F" not supported.\n",
+ (s16_t)type, (s16_t)code));
+ ICMP_STATS_INC(icmp.proterr);
+ ICMP_STATS_INC(icmp.drop);
+ }
+ pbuf_free(p);
+ return;
+lenerr:
+ pbuf_free(p);
+ ICMP_STATS_INC(icmp.lenerr);
+ snmp_inc_icmpinerrors();
+ return;
+#if LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
+memerr:
+ pbuf_free(p);
+ ICMP_STATS_INC(icmp.err);
+ snmp_inc_icmpinerrors();
+ return;
+#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
+}
+
+/**
+ * Send an icmp 'destination unreachable' packet, called from ip_input() if
+ * the transport layer protocol is unknown and from udp_input() if the local
+ * port is not bound.
+ *
+ * @param p the input packet for which the 'unreachable' should be sent,
+ * p->payload pointing to the IP header
+ * @param t type of the 'unreachable' packet
+ */
+void
+icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t)
+{
+ icmp_send_response(p, ICMP_DUR, t);
+}
+
+#if IP_FORWARD || IP_REASSEMBLY
+/**
+ * Send a 'time exceeded' packet, called from ip_forward() if TTL is 0.
+ *
+ * @param p the input packet for which the 'time exceeded' should be sent,
+ * p->payload pointing to the IP header
+ * @param t type of the 'time exceeded' packet
+ */
+void
+icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t)
+{
+ icmp_send_response(p, ICMP_TE, t);
+}
+
+#endif /* IP_FORWARD || IP_REASSEMBLY */
+
+/**
+ * Send an icmp packet in response to an incoming packet.
+ *
+ * @param p the input packet for which the 'unreachable' should be sent,
+ * p->payload pointing to the IP header
+ * @param type Type of the ICMP header
+ * @param code Code of the ICMP header
+ */
+static void
+icmp_send_response(struct pbuf *p, u8_t type, u8_t code)
+{
+ struct pbuf *q;
+ struct ip_hdr *iphdr;
+ /* we can use the echo header here */
+ struct icmp_echo_hdr *icmphdr;
+ ip_addr_t iphdr_src;
+
+ /* ICMP header + IP header + 8 bytes of data */
+ q = pbuf_alloc(PBUF_IP, sizeof(struct icmp_echo_hdr) + IP_HLEN + ICMP_DEST_UNREACH_DATASIZE,
+ PBUF_RAM);
+ if (q == NULL) {
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded: failed to allocate pbuf for ICMP packet.\n"));
+ return;
+ }
+ LWIP_ASSERT("check that first pbuf can hold icmp message",
+ (q->len >= (sizeof(struct icmp_echo_hdr) + IP_HLEN + ICMP_DEST_UNREACH_DATASIZE)));
+
+ iphdr = (struct ip_hdr *)p->payload;
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded from "));
+ ip_addr_debug_print(ICMP_DEBUG, &(iphdr->src));
+ LWIP_DEBUGF(ICMP_DEBUG, (" to "));
+ ip_addr_debug_print(ICMP_DEBUG, &(iphdr->dest));
+ LWIP_DEBUGF(ICMP_DEBUG, ("\n"));
+
+ icmphdr = (struct icmp_echo_hdr *)q->payload;
+ icmphdr->type = type;
+ icmphdr->code = code;
+ icmphdr->id = 0;
+ icmphdr->seqno = 0;
+
+ /* copy fields from original packet */
+ SMEMCPY((u8_t *)q->payload + sizeof(struct icmp_echo_hdr), (u8_t *)p->payload,
+ IP_HLEN + ICMP_DEST_UNREACH_DATASIZE);
+
+ /* calculate checksum */
+ icmphdr->chksum = 0;
+ icmphdr->chksum = inet_chksum(icmphdr, q->len);
+ ICMP_STATS_INC(icmp.xmit);
+ /* increase number of messages attempted to send */
+ snmp_inc_icmpoutmsgs();
+ /* increase number of destination unreachable messages attempted to send */
+ snmp_inc_icmpouttimeexcds();
+ ip_addr_copy(iphdr_src, iphdr->src);
+ ip_output(q, NULL, &iphdr_src, ICMP_TTL, 0, IP_PROTO_ICMP);
+ pbuf_free(q);
+}
+
+#endif /* LWIP_ICMP */
--- /dev/null
+/**
+ * @file
+ * IGMP - Internet Group Management Protocol
+ *
+ */
+
+/*
+ * Copyright (c) 2002 CITEL Technologies Ltd.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is a contribution to the lwIP TCP/IP stack.
+ * The Swedish Institute of Computer Science and Adam Dunkels
+ * are specifically granted permission to redistribute this
+ * source code.
+*/
+
+/*-------------------------------------------------------------
+Note 1)
+Although the rfc requires V1 AND V2 capability
+we will only support v2 since now V1 is very old (August 1989)
+V1 can be added if required
+
+a debug print and statistic have been implemented to
+show this up.
+-------------------------------------------------------------
+-------------------------------------------------------------
+Note 2)
+A query for a specific group address (as opposed to ALLHOSTS)
+has now been implemented as I am unsure if it is required
+
+a debug print and statistic have been implemented to
+show this up.
+-------------------------------------------------------------
+-------------------------------------------------------------
+Note 3)
+The router alert rfc 2113 is implemented in outgoing packets
+but not checked rigorously incoming
+-------------------------------------------------------------
+Steve Reynolds
+------------------------------------------------------------*/
+
+/*-----------------------------------------------------------------------------
+ * RFC 988 - Host extensions for IP multicasting - V0
+ * RFC 1054 - Host extensions for IP multicasting -
+ * RFC 1112 - Host extensions for IP multicasting - V1
+ * RFC 2236 - Internet Group Management Protocol, Version 2 - V2 <- this code is based on this RFC (it's the "de facto" standard)
+ * RFC 3376 - Internet Group Management Protocol, Version 3 - V3
+ * RFC 4604 - Using Internet Group Management Protocol Version 3... - V3+
+ * RFC 2113 - IP Router Alert Option -
+ *----------------------------------------------------------------------------*/
+
+/*-----------------------------------------------------------------------------
+ * Includes
+ *----------------------------------------------------------------------------*/
+
+#include "lwip/opt.h"
+
+#if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/igmp.h"
+#include "lwip/debug.h"
+#include "lwip/def.h"
+#include "lwip/mem.h"
+#include "lwip/ip.h"
+#include "lwip/inet_chksum.h"
+#include "lwip/netif.h"
+#include "lwip/icmp.h"
+#include "lwip/udp.h"
+#include "lwip/tcp.h"
+#include "lwip/stats.h"
+
+#include "string.h"
+
+/*
+ * IGMP constants
+ */
+#define IGMP_TTL 1
+#define IGMP_MINLEN 8
+#define ROUTER_ALERT 0x9404U
+#define ROUTER_ALERTLEN 4
+
+/*
+ * IGMP message types, including version number.
+ */
+#define IGMP_MEMB_QUERY 0x11 /* Membership query */
+#define IGMP_V1_MEMB_REPORT 0x12 /* Ver. 1 membership report */
+#define IGMP_V2_MEMB_REPORT 0x16 /* Ver. 2 membership report */
+#define IGMP_LEAVE_GROUP 0x17 /* Leave-group message */
+
+/* Group membership states */
+#define IGMP_GROUP_NON_MEMBER 0
+#define IGMP_GROUP_DELAYING_MEMBER 1
+#define IGMP_GROUP_IDLE_MEMBER 2
+
+/**
+ * IGMP packet format.
+ */
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+struct igmp_msg {
+ PACK_STRUCT_FIELD(u8_t igmp_msgtype);
+ PACK_STRUCT_FIELD(u8_t igmp_maxresp);
+ PACK_STRUCT_FIELD(u16_t igmp_checksum);
+ PACK_STRUCT_FIELD(ip_addr_p_t igmp_group_address);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+
+
+static struct igmp_group *igmp_lookup_group(struct netif *ifp, ip_addr_t *addr);
+static err_t igmp_remove_group(struct igmp_group *group);
+static void igmp_timeout( struct igmp_group *group);
+static void igmp_start_timer(struct igmp_group *group, u8_t max_time);
+static void igmp_stop_timer(struct igmp_group *group);
+static void igmp_delaying_member(struct igmp_group *group, u8_t maxresp);
+static err_t igmp_ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, struct netif *netif);
+static void igmp_send(struct igmp_group *group, u8_t type);
+
+
+static struct igmp_group* igmp_group_list;
+static ip_addr_t allsystems;
+static ip_addr_t allrouters;
+
+
+/**
+ * Initialize the IGMP module
+ */
+void
+igmp_init(void)
+{
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_init: initializing\n"));
+
+ IP4_ADDR(&allsystems, 224, 0, 0, 1);
+ IP4_ADDR(&allrouters, 224, 0, 0, 2);
+}
+
+#ifdef LWIP_DEBUG
+/**
+ * Dump global IGMP groups list
+ */
+void
+igmp_dump_group_list()
+{
+ struct igmp_group *group = igmp_group_list;
+
+ while (group != NULL) {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_dump_group_list: [%"U32_F"] ", (u32_t)(group->group_state)));
+ ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
+ LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
+ group = group->next;
+ }
+ LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
+}
+#else
+#define igmp_dump_group_list()
+#endif /* LWIP_DEBUG */
+
+/**
+ * Start IGMP processing on interface
+ *
+ * @param netif network interface on which start IGMP processing
+ */
+err_t
+igmp_start(struct netif *netif)
+{
+ struct igmp_group* group;
+
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: starting IGMP processing on if %p\n", netif));
+
+ group = igmp_lookup_group(netif, &allsystems);
+
+ if (group != NULL) {
+ group->group_state = IGMP_GROUP_IDLE_MEMBER;
+ group->use++;
+
+ /* Allow the igmp messages at the MAC level */
+ if (netif->igmp_mac_filter != NULL) {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: igmp_mac_filter(ADD "));
+ ip_addr_debug_print(IGMP_DEBUG, &allsystems);
+ LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
+ netif->igmp_mac_filter(netif, &allsystems, IGMP_ADD_MAC_FILTER);
+ }
+
+ return ERR_OK;
+ }
+
+ return ERR_MEM;
+}
+
+/**
+ * Stop IGMP processing on interface
+ *
+ * @param netif network interface on which stop IGMP processing
+ */
+err_t
+igmp_stop(struct netif *netif)
+{
+ struct igmp_group *group = igmp_group_list;
+ struct igmp_group *prev = NULL;
+ struct igmp_group *next;
+
+ /* look for groups joined on this interface further down the list */
+ while (group != NULL) {
+ next = group->next;
+ /* is it a group joined on this interface? */
+ if (group->netif == netif) {
+ /* is it the first group of the list? */
+ if (group == igmp_group_list) {
+ igmp_group_list = next;
+ }
+ /* is there a "previous" group defined? */
+ if (prev != NULL) {
+ prev->next = next;
+ }
+ /* disable the group at the MAC level */
+ if (netif->igmp_mac_filter != NULL) {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_stop: igmp_mac_filter(DEL "));
+ ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
+ LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
+ netif->igmp_mac_filter(netif, &(group->group_address), IGMP_DEL_MAC_FILTER);
+ }
+ /* free group */
+ memp_free(MEMP_IGMP_GROUP, group);
+ } else {
+ /* change the "previous" */
+ prev = group;
+ }
+ /* move to "next" */
+ group = next;
+ }
+ return ERR_OK;
+}
+
+/**
+ * Report IGMP memberships for this interface
+ *
+ * @param netif network interface on which report IGMP memberships
+ */
+void
+igmp_report_groups(struct netif *netif)
+{
+ struct igmp_group *group = igmp_group_list;
+
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_report_groups: sending IGMP reports on if %p\n", netif));
+
+ while (group != NULL) {
+ if (group->netif == netif) {
+ igmp_delaying_member(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
+ }
+ group = group->next;
+ }
+}
+
+/**
+ * Search for a group in the global igmp_group_list
+ *
+ * @param ifp the network interface for which to look
+ * @param addr the group ip address to search for
+ * @return a struct igmp_group* if the group has been found,
+ * NULL if the group wasn't found.
+ */
+struct igmp_group *
+igmp_lookfor_group(struct netif *ifp, ip_addr_t *addr)
+{
+ struct igmp_group *group = igmp_group_list;
+
+ while (group != NULL) {
+ if ((group->netif == ifp) && (ip_addr_cmp(&(group->group_address), addr))) {
+ return group;
+ }
+ group = group->next;
+ }
+
+ /* to be clearer, we return NULL here instead of
+ * 'group' (which is also NULL at this point).
+ */
+ return NULL;
+}
+
+/**
+ * Search for a specific igmp group and create a new one if not found-
+ *
+ * @param ifp the network interface for which to look
+ * @param addr the group ip address to search
+ * @return a struct igmp_group*,
+ * NULL on memory error.
+ */
+struct igmp_group *
+igmp_lookup_group(struct netif *ifp, ip_addr_t *addr)
+{
+ struct igmp_group *group = igmp_group_list;
+
+ /* Search if the group already exists */
+ group = igmp_lookfor_group(ifp, addr);
+ if (group != NULL) {
+ /* Group already exists. */
+ return group;
+ }
+
+ /* Group doesn't exist yet, create a new one */
+ group = (struct igmp_group *)memp_malloc(MEMP_IGMP_GROUP);
+ if (group != NULL) {
+ group->netif = ifp;
+ ip_addr_set(&(group->group_address), addr);
+ group->timer = 0; /* Not running */
+ group->group_state = IGMP_GROUP_NON_MEMBER;
+ group->last_reporter_flag = 0;
+ group->use = 0;
+ group->next = igmp_group_list;
+
+ igmp_group_list = group;
+ }
+
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_lookup_group: %sallocated a new group with address ", (group?"":"impossible to ")));
+ ip_addr_debug_print(IGMP_DEBUG, addr);
+ LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", ifp));
+
+ return group;
+}
+
+/**
+ * Remove a group in the global igmp_group_list
+ *
+ * @param group the group to remove from the global igmp_group_list
+ * @return ERR_OK if group was removed from the list, an err_t otherwise
+ */
+static err_t
+igmp_remove_group(struct igmp_group *group)
+{
+ err_t err = ERR_OK;
+
+ /* Is it the first group? */
+ if (igmp_group_list == group) {
+ igmp_group_list = group->next;
+ } else {
+ /* look for group further down the list */
+ struct igmp_group *tmpGroup;
+ for (tmpGroup = igmp_group_list; tmpGroup != NULL; tmpGroup = tmpGroup->next) {
+ if (tmpGroup->next == group) {
+ tmpGroup->next = group->next;
+ break;
+ }
+ }
+ /* Group not found in the global igmp_group_list */
+ if (tmpGroup == NULL)
+ err = ERR_ARG;
+ }
+ /* free group */
+ memp_free(MEMP_IGMP_GROUP, group);
+
+ return err;
+}
+
+/**
+ * Called from ip_input() if a new IGMP packet is received.
+ *
+ * @param p received igmp packet, p->payload pointing to the ip header
+ * @param inp network interface on which the packet was received
+ * @param dest destination ip address of the igmp packet
+ */
+void
+igmp_input(struct pbuf *p, struct netif *inp, ip_addr_t *dest)
+{
+ struct ip_hdr * iphdr;
+ struct igmp_msg* igmp;
+ struct igmp_group* group;
+ struct igmp_group* groupref;
+
+ IGMP_STATS_INC(igmp.recv);
+
+ /* Note that the length CAN be greater than 8 but only 8 are used - All are included in the checksum */
+ iphdr = (struct ip_hdr *)p->payload;
+ if (pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4)) || (p->len < IGMP_MINLEN)) {
+ pbuf_free(p);
+ IGMP_STATS_INC(igmp.lenerr);
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: length error\n"));
+ return;
+ }
+
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: message from "));
+ ip_addr_debug_print(IGMP_DEBUG, &(iphdr->src));
+ LWIP_DEBUGF(IGMP_DEBUG, (" to address "));
+ ip_addr_debug_print(IGMP_DEBUG, &(iphdr->dest));
+ LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", inp));
+
+ /* Now calculate and check the checksum */
+ igmp = (struct igmp_msg *)p->payload;
+ if (inet_chksum(igmp, p->len)) {
+ pbuf_free(p);
+ IGMP_STATS_INC(igmp.chkerr);
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: checksum error\n"));
+ return;
+ }
+
+ /* Packet is ok so find an existing group */
+ group = igmp_lookfor_group(inp, dest); /* use the destination IP address of incoming packet */
+
+ /* If group can be found or create... */
+ if (!group) {
+ pbuf_free(p);
+ IGMP_STATS_INC(igmp.drop);
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP frame not for us\n"));
+ return;
+ }
+
+ /* NOW ACT ON THE INCOMING MESSAGE TYPE... */
+ switch (igmp->igmp_msgtype) {
+ case IGMP_MEMB_QUERY: {
+ /* IGMP_MEMB_QUERY to the "all systems" address ? */
+ if ((ip_addr_cmp(dest, &allsystems)) && ip_addr_isany(&igmp->igmp_group_address)) {
+ /* THIS IS THE GENERAL QUERY */
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: General IGMP_MEMB_QUERY on \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
+
+ if (igmp->igmp_maxresp == 0) {
+ IGMP_STATS_INC(igmp.rx_v1);
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: got an all hosts query with time== 0 - this is V1 and not implemented - treat as v2\n"));
+ igmp->igmp_maxresp = IGMP_V1_DELAYING_MEMBER_TMR;
+ } else {
+ IGMP_STATS_INC(igmp.rx_general);
+ }
+
+ groupref = igmp_group_list;
+ while (groupref) {
+ /* Do not send messages on the all systems group address! */
+ if ((groupref->netif == inp) && (!(ip_addr_cmp(&(groupref->group_address), &allsystems)))) {
+ igmp_delaying_member(groupref, igmp->igmp_maxresp);
+ }
+ groupref = groupref->next;
+ }
+ } else {
+ /* IGMP_MEMB_QUERY to a specific group ? */
+ if (!ip_addr_isany(&igmp->igmp_group_address)) {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_MEMB_QUERY to a specific group "));
+ ip_addr_debug_print(IGMP_DEBUG, &igmp->igmp_group_address);
+ if (ip_addr_cmp(dest, &allsystems)) {
+ ip_addr_t groupaddr;
+ LWIP_DEBUGF(IGMP_DEBUG, (" using \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
+ /* we first need to re-look for the group since we used dest last time */
+ ip_addr_copy(groupaddr, igmp->igmp_group_address);
+ group = igmp_lookfor_group(inp, &groupaddr);
+ } else {
+ LWIP_DEBUGF(IGMP_DEBUG, (" with the group address as destination [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
+ }
+
+ if (group != NULL) {
+ IGMP_STATS_INC(igmp.rx_group);
+ igmp_delaying_member(group, igmp->igmp_maxresp);
+ } else {
+ IGMP_STATS_INC(igmp.drop);
+ }
+ } else {
+ IGMP_STATS_INC(igmp.proterr);
+ }
+ }
+ break;
+ }
+ case IGMP_V2_MEMB_REPORT: {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_V2_MEMB_REPORT\n"));
+ IGMP_STATS_INC(igmp.rx_report);
+ if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
+ /* This is on a specific group we have already looked up */
+ group->timer = 0; /* stopped */
+ group->group_state = IGMP_GROUP_IDLE_MEMBER;
+ group->last_reporter_flag = 0;
+ }
+ break;
+ }
+ default: {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: unexpected msg %d in state %d on group %p on if %p\n",
+ igmp->igmp_msgtype, group->group_state, &group, group->netif));
+ IGMP_STATS_INC(igmp.proterr);
+ break;
+ }
+ }
+
+ pbuf_free(p);
+ return;
+}
+
+/**
+ * Join a group on one network interface.
+ *
+ * @param ifaddr ip address of the network interface which should join a new group
+ * @param groupaddr the ip address of the group which to join
+ * @return ERR_OK if group was joined on the netif(s), an err_t otherwise
+ */
+err_t
+igmp_joingroup(ip_addr_t *ifaddr, ip_addr_t *groupaddr)
+{
+ err_t err = ERR_VAL; /* no matching interface */
+ struct igmp_group *group;
+ struct netif *netif;
+
+ /* make sure it is multicast address */
+ LWIP_ERROR("igmp_joingroup: attempt to join non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
+ LWIP_ERROR("igmp_joingroup: attempt to join allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
+
+ /* loop through netif's */
+ netif = netif_list;
+ while (netif != NULL) {
+ /* Should we join this interface ? */
+ if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
+ /* find group or create a new one if not found */
+ group = igmp_lookup_group(netif, groupaddr);
+
+ if (group != NULL) {
+ /* This should create a new group, check the state to make sure */
+ if (group->group_state != IGMP_GROUP_NON_MEMBER) {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to group not in state IGMP_GROUP_NON_MEMBER\n"));
+ } else {
+ /* OK - it was new group */
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to new group: "));
+ ip_addr_debug_print(IGMP_DEBUG, groupaddr);
+ LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
+
+ /* If first use of the group, allow the group at the MAC level */
+ if ((group->use==0) && (netif->igmp_mac_filter != NULL)) {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: igmp_mac_filter(ADD "));
+ ip_addr_debug_print(IGMP_DEBUG, groupaddr);
+ LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
+ netif->igmp_mac_filter(netif, groupaddr, IGMP_ADD_MAC_FILTER);
+ }
+
+ IGMP_STATS_INC(igmp.tx_join);
+ igmp_send(group, IGMP_V2_MEMB_REPORT);
+
+ igmp_start_timer(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
+
+ /* Need to work out where this timer comes from */
+ group->group_state = IGMP_GROUP_DELAYING_MEMBER;
+ }
+ /* Increment group use */
+ group->use++;
+ /* Join on this interface */
+ err = ERR_OK;
+ } else {
+ /* Return an error even if some network interfaces are joined */
+ /** @todo undo any other netif already joined */
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: Not enought memory to join to group\n"));
+ return ERR_MEM;
+ }
+ }
+ /* proceed to next network interface */
+ netif = netif->next;
+ }
+
+ return err;
+}
+
+/**
+ * Leave a group on one network interface.
+ *
+ * @param ifaddr ip address of the network interface which should leave a group
+ * @param groupaddr the ip address of the group which to leave
+ * @return ERR_OK if group was left on the netif(s), an err_t otherwise
+ */
+err_t
+igmp_leavegroup(ip_addr_t *ifaddr, ip_addr_t *groupaddr)
+{
+ err_t err = ERR_VAL; /* no matching interface */
+ struct igmp_group *group;
+ struct netif *netif;
+
+ /* make sure it is multicast address */
+ LWIP_ERROR("igmp_leavegroup: attempt to leave non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
+ LWIP_ERROR("igmp_leavegroup: attempt to leave allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
+
+ /* loop through netif's */
+ netif = netif_list;
+ while (netif != NULL) {
+ /* Should we leave this interface ? */
+ if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
+ /* find group */
+ group = igmp_lookfor_group(netif, groupaddr);
+
+ if (group != NULL) {
+ /* Only send a leave if the flag is set according to the state diagram */
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: Leaving group: "));
+ ip_addr_debug_print(IGMP_DEBUG, groupaddr);
+ LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
+
+ /* If there is no other use of the group */
+ if (group->use <= 1) {
+ /* If we are the last reporter for this group */
+ if (group->last_reporter_flag) {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: sending leaving group\n"));
+ IGMP_STATS_INC(igmp.tx_leave);
+ igmp_send(group, IGMP_LEAVE_GROUP);
+ }
+
+ /* Disable the group at the MAC level */
+ if (netif->igmp_mac_filter != NULL) {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: igmp_mac_filter(DEL "));
+ ip_addr_debug_print(IGMP_DEBUG, groupaddr);
+ LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
+ netif->igmp_mac_filter(netif, groupaddr, IGMP_DEL_MAC_FILTER);
+ }
+
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: remove group: "));
+ ip_addr_debug_print(IGMP_DEBUG, groupaddr);
+ LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
+
+ /* Free the group */
+ igmp_remove_group(group);
+ } else {
+ /* Decrement group use */
+ group->use--;
+ }
+ /* Leave on this interface */
+ err = ERR_OK;
+ } else {
+ /* It's not a fatal error on "leavegroup" */
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: not member of group\n"));
+ }
+ }
+ /* proceed to next network interface */
+ netif = netif->next;
+ }
+
+ return err;
+}
+
+/**
+ * The igmp timer function (both for NO_SYS=1 and =0)
+ * Should be called every IGMP_TMR_INTERVAL milliseconds (100 ms is default).
+ */
+void
+igmp_tmr(void)
+{
+ struct igmp_group *group = igmp_group_list;
+
+ while (group != NULL) {
+ if (group->timer > 0) {
+ group->timer--;
+ if (group->timer == 0) {
+ igmp_timeout(group);
+ }
+ }
+ group = group->next;
+ }
+}
+
+/**
+ * Called if a timeout for one group is reached.
+ * Sends a report for this group.
+ *
+ * @param group an igmp_group for which a timeout is reached
+ */
+static void
+igmp_timeout(struct igmp_group *group)
+{
+ /* If the state is IGMP_GROUP_DELAYING_MEMBER then we send a report for this group */
+ if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_timeout: report membership for group with address "));
+ ip_addr_debug_print(IGMP_DEBUG, &(group->group_address));
+ LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->netif));
+
+ IGMP_STATS_INC(igmp.tx_report);
+ igmp_send(group, IGMP_V2_MEMB_REPORT);
+ }
+}
+
+/**
+ * Start a timer for an igmp group
+ *
+ * @param group the igmp_group for which to start a timer
+ * @param max_time the time in multiples of IGMP_TMR_INTERVAL (decrease with
+ * every call to igmp_tmr())
+ */
+static void
+igmp_start_timer(struct igmp_group *group, u8_t max_time)
+{
+ /* ensure the input value is > 0 */
+ if (max_time == 0) {
+ max_time = 1;
+ }
+ /* ensure the random value is > 0 */
+ group->timer = (LWIP_RAND() % (max_time - 1)) + 1;
+}
+
+/**
+ * Stop a timer for an igmp_group
+ *
+ * @param group the igmp_group for which to stop the timer
+ */
+static void
+igmp_stop_timer(struct igmp_group *group)
+{
+ group->timer = 0;
+}
+
+/**
+ * Delaying membership report for a group if necessary
+ *
+ * @param group the igmp_group for which "delaying" membership report
+ * @param maxresp query delay
+ */
+static void
+igmp_delaying_member(struct igmp_group *group, u8_t maxresp)
+{
+ if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) ||
+ ((group->group_state == IGMP_GROUP_DELAYING_MEMBER) &&
+ ((group->timer == 0) || (maxresp < group->timer)))) {
+ igmp_start_timer(group, maxresp);
+ group->group_state = IGMP_GROUP_DELAYING_MEMBER;
+ }
+}
+
+
+/**
+ * Sends an IP packet on a network interface. This function constructs the IP header
+ * and calculates the IP header checksum. If the source IP address is NULL,
+ * the IP address of the outgoing network interface is filled in as source address.
+ *
+ * @param p the packet to send (p->payload points to the data, e.g. next
+ protocol header; if dest == IP_HDRINCL, p already includes an IP
+ header and p->payload points to that IP header)
+ * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
+ * IP address of the netif used to send is used as source address)
+ * @param dest the destination IP address to send the packet to
+ * @param ttl the TTL value to be set in the IP header
+ * @param proto the PROTOCOL to be set in the IP header
+ * @param netif the netif on which to send this packet
+ * @return ERR_OK if the packet was sent OK
+ * ERR_BUF if p doesn't have enough space for IP/LINK headers
+ * returns errors returned by netif->output
+ */
+static err_t
+igmp_ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, struct netif *netif)
+{
+ /* This is the "router alert" option */
+ u16_t ra[2];
+ ra[0] = PP_HTONS(ROUTER_ALERT);
+ ra[1] = 0x0000; /* Router shall examine packet */
+ IGMP_STATS_INC(igmp.xmit);
+ return ip_output_if_opt(p, src, dest, IGMP_TTL, 0, IP_PROTO_IGMP, netif, ra, ROUTER_ALERTLEN);
+}
+
+/**
+ * Send an igmp packet to a specific group.
+ *
+ * @param group the group to which to send the packet
+ * @param type the type of igmp packet to send
+ */
+static void
+igmp_send(struct igmp_group *group, u8_t type)
+{
+ struct pbuf* p = NULL;
+ struct igmp_msg* igmp = NULL;
+ ip_addr_t src = *IP_ADDR_ANY;
+ ip_addr_t* dest = NULL;
+
+ /* IP header + "router alert" option + IGMP header */
+ p = pbuf_alloc(PBUF_TRANSPORT, IGMP_MINLEN, PBUF_RAM);
+
+ if (p) {
+ igmp = (struct igmp_msg *)p->payload;
+ LWIP_ASSERT("igmp_send: check that first pbuf can hold struct igmp_msg",
+ (p->len >= sizeof(struct igmp_msg)));
+ ip_addr_copy(src, group->netif->ip_addr);
+
+ if (type == IGMP_V2_MEMB_REPORT) {
+ dest = &(group->group_address);
+ ip_addr_copy(igmp->igmp_group_address, group->group_address);
+ group->last_reporter_flag = 1; /* Remember we were the last to report */
+ } else {
+ if (type == IGMP_LEAVE_GROUP) {
+ dest = &allrouters;
+ ip_addr_copy(igmp->igmp_group_address, group->group_address);
+ }
+ }
+
+ if ((type == IGMP_V2_MEMB_REPORT) || (type == IGMP_LEAVE_GROUP)) {
+ igmp->igmp_msgtype = type;
+ igmp->igmp_maxresp = 0;
+ igmp->igmp_checksum = 0;
+ igmp->igmp_checksum = inet_chksum(igmp, IGMP_MINLEN);
+
+ igmp_ip_output_if(p, &src, dest, group->netif);
+ }
+
+ pbuf_free(p);
+ } else {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_send: not enough memory for igmp_send\n"));
+ IGMP_STATS_INC(igmp.memerr);
+ }
+}
+
+#endif /* LWIP_IGMP */
--- /dev/null
+/**
+ * @file
+ * Functions common to all TCP/IPv4 modules, such as the byte order functions.
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/inet.h"
+
--- /dev/null
+/**
+ * @file
+ * Incluse internet checksum functions.
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/inet_chksum.h"
+#include "lwip/def.h"
+
+#include <stddef.h>
+#include <string.h>
+
+/* These are some reference implementations of the checksum algorithm, with the
+ * aim of being simple, correct and fully portable. Checksumming is the
+ * first thing you would want to optimize for your platform. If you create
+ * your own version, link it in and in your cc.h put:
+ *
+ * #define LWIP_CHKSUM <your_checksum_routine>
+ *
+ * Or you can select from the implementations below by defining
+ * LWIP_CHKSUM_ALGORITHM to 1, 2 or 3.
+ */
+
+#ifndef LWIP_CHKSUM
+# define LWIP_CHKSUM lwip_standard_chksum
+# ifndef LWIP_CHKSUM_ALGORITHM
+# define LWIP_CHKSUM_ALGORITHM 2
+# endif
+#endif
+/* If none set: */
+#ifndef LWIP_CHKSUM_ALGORITHM
+# define LWIP_CHKSUM_ALGORITHM 0
+#endif
+
+#if (LWIP_CHKSUM_ALGORITHM == 1) /* Version #1 */
+/**
+ * lwip checksum
+ *
+ * @param dataptr points to start of data to be summed at any boundary
+ * @param len length of data to be summed
+ * @return host order (!) lwip checksum (non-inverted Internet sum)
+ *
+ * @note accumulator size limits summable length to 64k
+ * @note host endianess is irrelevant (p3 RFC1071)
+ */
+static u16_t
+lwip_standard_chksum(void *dataptr, u16_t len)
+{
+ u32_t acc;
+ u16_t src;
+ u8_t *octetptr;
+
+ acc = 0;
+ /* dataptr may be at odd or even addresses */
+ octetptr = (u8_t*)dataptr;
+ while (len > 1) {
+ /* declare first octet as most significant
+ thus assume network order, ignoring host order */
+ src = (*octetptr) << 8;
+ octetptr++;
+ /* declare second octet as least significant */
+ src |= (*octetptr);
+ octetptr++;
+ acc += src;
+ len -= 2;
+ }
+ if (len > 0) {
+ /* accumulate remaining octet */
+ src = (*octetptr) << 8;
+ acc += src;
+ }
+ /* add deferred carry bits */
+ acc = (acc >> 16) + (acc & 0x0000ffffUL);
+ if ((acc & 0xffff0000UL) != 0) {
+ acc = (acc >> 16) + (acc & 0x0000ffffUL);
+ }
+ /* This maybe a little confusing: reorder sum using htons()
+ instead of ntohs() since it has a little less call overhead.
+ The caller must invert bits for Internet sum ! */
+ return htons((u16_t)acc);
+}
+#endif
+
+#if (LWIP_CHKSUM_ALGORITHM == 2) /* Alternative version #2 */
+/*
+ * Curt McDowell
+ * Broadcom Corp.
+ * csm@broadcom.com
+ *
+ * IP checksum two bytes at a time with support for
+ * unaligned buffer.
+ * Works for len up to and including 0x20000.
+ * by Curt McDowell, Broadcom Corp. 12/08/2005
+ *
+ * @param dataptr points to start of data to be summed at any boundary
+ * @param len length of data to be summed
+ * @return host order (!) lwip checksum (non-inverted Internet sum)
+ */
+
+static u16_t
+lwip_standard_chksum(void *dataptr, int len)
+{
+ u8_t *pb = (u8_t *)dataptr;
+ u16_t *ps, t = 0;
+ u32_t sum = 0;
+ int odd = ((mem_ptr_t)pb & 1);
+
+ /* Get aligned to u16_t */
+ if (odd && len > 0) {
+ ((u8_t *)&t)[1] = *pb++;
+ len--;
+ }
+
+ /* Add the bulk of the data */
+ ps = (u16_t *)(void *)pb;
+ while (len > 1) {
+ sum += *ps++;
+ len -= 2;
+ }
+
+ /* Consume left-over byte, if any */
+ if (len > 0) {
+ ((u8_t *)&t)[0] = *(u8_t *)ps;
+ }
+
+ /* Add end bytes */
+ sum += t;
+
+ /* Fold 32-bit sum to 16 bits
+ calling this twice is propably faster than if statements... */
+ sum = FOLD_U32T(sum);
+ sum = FOLD_U32T(sum);
+
+ /* Swap if alignment was odd */
+ if (odd) {
+ sum = SWAP_BYTES_IN_WORD(sum);
+ }
+
+ return (u16_t)sum;
+}
+#endif
+
+#if (LWIP_CHKSUM_ALGORITHM == 3) /* Alternative version #3 */
+/**
+ * An optimized checksum routine. Basically, it uses loop-unrolling on
+ * the checksum loop, treating the head and tail bytes specially, whereas
+ * the inner loop acts on 8 bytes at a time.
+ *
+ * @arg start of buffer to be checksummed. May be an odd byte address.
+ * @len number of bytes in the buffer to be checksummed.
+ * @return host order (!) lwip checksum (non-inverted Internet sum)
+ *
+ * by Curt McDowell, Broadcom Corp. December 8th, 2005
+ */
+
+static u16_t
+lwip_standard_chksum(void *dataptr, int len)
+{
+ u8_t *pb = (u8_t *)dataptr;
+ u16_t *ps, t = 0;
+ u32_t *pl;
+ u32_t sum = 0, tmp;
+ /* starts at odd byte address? */
+ int odd = ((mem_ptr_t)pb & 1);
+
+ if (odd && len > 0) {
+ ((u8_t *)&t)[1] = *pb++;
+ len--;
+ }
+
+ ps = (u16_t *)pb;
+
+ if (((mem_ptr_t)ps & 3) && len > 1) {
+ sum += *ps++;
+ len -= 2;
+ }
+
+ pl = (u32_t *)ps;
+
+ while (len > 7) {
+ tmp = sum + *pl++; /* ping */
+ if (tmp < sum) {
+ tmp++; /* add back carry */
+ }
+
+ sum = tmp + *pl++; /* pong */
+ if (sum < tmp) {
+ sum++; /* add back carry */
+ }
+
+ len -= 8;
+ }
+
+ /* make room in upper bits */
+ sum = FOLD_U32T(sum);
+
+ ps = (u16_t *)pl;
+
+ /* 16-bit aligned word remaining? */
+ while (len > 1) {
+ sum += *ps++;
+ len -= 2;
+ }
+
+ /* dangling tail byte remaining? */
+ if (len > 0) { /* include odd byte */
+ ((u8_t *)&t)[0] = *(u8_t *)ps;
+ }
+
+ sum += t; /* add end bytes */
+
+ /* Fold 32-bit sum to 16 bits
+ calling this twice is propably faster than if statements... */
+ sum = FOLD_U32T(sum);
+ sum = FOLD_U32T(sum);
+
+ if (odd) {
+ sum = SWAP_BYTES_IN_WORD(sum);
+ }
+
+ return (u16_t)sum;
+}
+#endif
+
+/* inet_chksum_pseudo:
+ *
+ * Calculates the pseudo Internet checksum used by TCP and UDP for a pbuf chain.
+ * IP addresses are expected to be in network byte order.
+ *
+ * @param p chain of pbufs over that a checksum should be calculated (ip data part)
+ * @param src source ip address (used for checksum of pseudo header)
+ * @param dst destination ip address (used for checksum of pseudo header)
+ * @param proto ip protocol (used for checksum of pseudo header)
+ * @param proto_len length of the ip data part (used for checksum of pseudo header)
+ * @return checksum (as u16_t) to be saved directly in the protocol header
+ */
+u16_t
+inet_chksum_pseudo(struct pbuf *p,
+ ip_addr_t *src, ip_addr_t *dest,
+ u8_t proto, u16_t proto_len)
+{
+ u32_t acc;
+ u32_t addr;
+ struct pbuf *q;
+ u8_t swapped;
+
+ acc = 0;
+ swapped = 0;
+ /* iterate through all pbuf in chain */
+ for(q = p; q != NULL; q = q->next) {
+ LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): checksumming pbuf %p (has next %p) \n",
+ (void *)q, (void *)q->next));
+ acc += LWIP_CHKSUM(q->payload, q->len);
+ /*LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): unwrapped lwip_chksum()=%"X32_F" \n", acc));*/
+ /* just executing this next line is probably faster that the if statement needed
+ to check whether we really need to execute it, and does no harm */
+ acc = FOLD_U32T(acc);
+ if (q->len % 2 != 0) {
+ swapped = 1 - swapped;
+ acc = SWAP_BYTES_IN_WORD(acc);
+ }
+ /*LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): wrapped lwip_chksum()=%"X32_F" \n", acc));*/
+ }
+
+ if (swapped) {
+ acc = SWAP_BYTES_IN_WORD(acc);
+ }
+ addr = ip4_addr_get_u32(src);
+ acc += (addr & 0xffffUL);
+ acc += ((addr >> 16) & 0xffffUL);
+ addr = ip4_addr_get_u32(dest);
+ acc += (addr & 0xffffUL);
+ acc += ((addr >> 16) & 0xffffUL);
+ acc += (u32_t)htons((u16_t)proto);
+ acc += (u32_t)htons(proto_len);
+
+ /* Fold 32-bit sum to 16 bits
+ calling this twice is propably faster than if statements... */
+ acc = FOLD_U32T(acc);
+ acc = FOLD_U32T(acc);
+ LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): pbuf chain lwip_chksum()=%"X32_F"\n", acc));
+ return (u16_t)~(acc & 0xffffUL);
+}
+
+/* inet_chksum_pseudo:
+ *
+ * Calculates the pseudo Internet checksum used by TCP and UDP for a pbuf chain.
+ * IP addresses are expected to be in network byte order.
+ *
+ * @param p chain of pbufs over that a checksum should be calculated (ip data part)
+ * @param src source ip address (used for checksum of pseudo header)
+ * @param dst destination ip address (used for checksum of pseudo header)
+ * @param proto ip protocol (used for checksum of pseudo header)
+ * @param proto_len length of the ip data part (used for checksum of pseudo header)
+ * @return checksum (as u16_t) to be saved directly in the protocol header
+ */
+u16_t
+inet_chksum_pseudo_partial(struct pbuf *p,
+ ip_addr_t *src, ip_addr_t *dest,
+ u8_t proto, u16_t proto_len, u16_t chksum_len)
+{
+ u32_t acc;
+ u32_t addr;
+ struct pbuf *q;
+ u8_t swapped;
+ u16_t chklen;
+
+ acc = 0;
+ swapped = 0;
+ /* iterate through all pbuf in chain */
+ for(q = p; (q != NULL) && (chksum_len > 0); q = q->next) {
+ LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): checksumming pbuf %p (has next %p) \n",
+ (void *)q, (void *)q->next));
+ chklen = q->len;
+ if (chklen > chksum_len) {
+ chklen = chksum_len;
+ }
+ acc += LWIP_CHKSUM(q->payload, chklen);
+ chksum_len -= chklen;
+ LWIP_ASSERT("delete me", chksum_len < 0x7fff);
+ /*LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): unwrapped lwip_chksum()=%"X32_F" \n", acc));*/
+ /* fold the upper bit down */
+ acc = FOLD_U32T(acc);
+ if (q->len % 2 != 0) {
+ swapped = 1 - swapped;
+ acc = SWAP_BYTES_IN_WORD(acc);
+ }
+ /*LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): wrapped lwip_chksum()=%"X32_F" \n", acc));*/
+ }
+
+ if (swapped) {
+ acc = SWAP_BYTES_IN_WORD(acc);
+ }
+ addr = ip4_addr_get_u32(src);
+ acc += (addr & 0xffffUL);
+ acc += ((addr >> 16) & 0xffffUL);
+ addr = ip4_addr_get_u32(dest);
+ acc += (addr & 0xffffUL);
+ acc += ((addr >> 16) & 0xffffUL);
+ acc += (u32_t)htons((u16_t)proto);
+ acc += (u32_t)htons(proto_len);
+
+ /* Fold 32-bit sum to 16 bits
+ calling this twice is propably faster than if statements... */
+ acc = FOLD_U32T(acc);
+ acc = FOLD_U32T(acc);
+ LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): pbuf chain lwip_chksum()=%"X32_F"\n", acc));
+ return (u16_t)~(acc & 0xffffUL);
+}
+
+/* inet_chksum:
+ *
+ * Calculates the Internet checksum over a portion of memory. Used primarily for IP
+ * and ICMP.
+ *
+ * @param dataptr start of the buffer to calculate the checksum (no alignment needed)
+ * @param len length of the buffer to calculate the checksum
+ * @return checksum (as u16_t) to be saved directly in the protocol header
+ */
+
+u16_t
+inet_chksum(void *dataptr, u16_t len)
+{
+ return ~LWIP_CHKSUM(dataptr, len);
+}
+
+/**
+ * Calculate a checksum over a chain of pbufs (without pseudo-header, much like
+ * inet_chksum only pbufs are used).
+ *
+ * @param p pbuf chain over that the checksum should be calculated
+ * @return checksum (as u16_t) to be saved directly in the protocol header
+ */
+u16_t
+inet_chksum_pbuf(struct pbuf *p)
+{
+ u32_t acc;
+ struct pbuf *q;
+ u8_t swapped;
+
+ acc = 0;
+ swapped = 0;
+ for(q = p; q != NULL; q = q->next) {
+ acc += LWIP_CHKSUM(q->payload, q->len);
+ acc = FOLD_U32T(acc);
+ if (q->len % 2 != 0) {
+ swapped = 1 - swapped;
+ acc = SWAP_BYTES_IN_WORD(acc);
+ }
+ }
+
+ if (swapped) {
+ acc = SWAP_BYTES_IN_WORD(acc);
+ }
+ return (u16_t)~(acc & 0xffffUL);
+}
+
+/* These are some implementations for LWIP_CHKSUM_COPY, which copies data
+ * like MEMCPY but generates a checksum at the same time. Since this is a
+ * performance-sensitive function, you might want to create your own version
+ * in assembly targeted at your hardware by defining it in lwipopts.h:
+ * #define LWIP_CHKSUM_COPY(dst, src, len) your_chksum_copy(dst, src, len)
+ */
+
+#if (LWIP_CHKSUM_COPY_ALGORITHM == 1) /* Version #1 */
+/** Safe but slow: first call MEMCPY, then call LWIP_CHKSUM.
+ * For architectures with big caches, data might still be in cache when
+ * generating the checksum after copying.
+ */
+u16_t
+lwip_chksum_copy(void *dst, const void *src, u16_t len)
+{
+ MEMCPY(dst, src, len);
+ return LWIP_CHKSUM(dst, len);
+}
+#endif /* (LWIP_CHKSUM_COPY_ALGORITHM == 1) */
--- /dev/null
+/**
+ * @file
+ * This is the IPv4 layer implementation for incoming and outgoing IP traffic.
+ *
+ * @see ip_frag.c
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+#include "lwip/ip.h"
+#include "lwip/def.h"
+#include "lwip/mem.h"
+#include "lwip/ip_frag.h"
+#include "lwip/inet_chksum.h"
+#include "lwip/netif.h"
+#include "lwip/icmp.h"
+#include "lwip/igmp.h"
+#include "lwip/raw.h"
+#include "lwip/udp.h"
+#include "lwip/tcp_impl.h"
+#include "lwip/snmp.h"
+#include "lwip/dhcp.h"
+#include "lwip/autoip.h"
+#include "lwip/stats.h"
+#include "arch/perf.h"
+
+#include <string.h>
+
+/** Set this to 0 in the rare case of wanting to call an extra function to
+ * generate the IP checksum (in contrast to calculating it on-the-fly). */
+#ifndef LWIP_INLINE_IP_CHKSUM
+#define LWIP_INLINE_IP_CHKSUM 1
+#endif
+#if LWIP_INLINE_IP_CHKSUM && CHECKSUM_GEN_IP
+#define CHECKSUM_GEN_IP_INLINE 1
+#else
+#define CHECKSUM_GEN_IP_INLINE 0
+#endif
+
+#if LWIP_DHCP || defined(LWIP_IP_ACCEPT_UDP_PORT)
+#define IP_ACCEPT_LINK_LAYER_ADDRESSING 1
+
+/** Some defines for DHCP to let link-layer-addressed packets through while the
+ * netif is down.
+ * To use this in your own application/protocol, define LWIP_IP_ACCEPT_UDP_PORT
+ * to return 1 if the port is accepted and 0 if the port is not accepted.
+ */
+#if LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT)
+/* accept DHCP client port and custom port */
+#define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (((port) == PP_NTOHS(DHCP_CLIENT_PORT)) \
+ || (LWIP_IP_ACCEPT_UDP_PORT(port)))
+#elif defined(LWIP_IP_ACCEPT_UDP_PORT) /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
+/* accept custom port only */
+#define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (LWIP_IP_ACCEPT_UDP_PORT(dst_port))
+#else /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
+/* accept DHCP client port only */
+#define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) ((port) == PP_NTOHS(DHCP_CLIENT_PORT))
+#endif /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
+
+#else /* LWIP_DHCP */
+#define IP_ACCEPT_LINK_LAYER_ADDRESSING 0
+#endif /* LWIP_DHCP */
+
+/**
+ * The interface that provided the packet for the current callback
+ * invocation.
+ */
+struct netif *current_netif;
+
+/**
+ * Header of the input packet currently being processed.
+ */
+const struct ip_hdr *current_header;
+/** Source IP address of current_header */
+ip_addr_t current_iphdr_src;
+/** Destination IP address of current_header */
+ip_addr_t current_iphdr_dest;
+
+/** The IP header ID of the next outgoing IP packet */
+static u16_t ip_id;
+
+/**
+ * Finds the appropriate network interface for a given IP address. It
+ * searches the list of network interfaces linearly. A match is found
+ * if the masked IP address of the network interface equals the masked
+ * IP address given to the function.
+ *
+ * @param dest the destination IP address for which to find the route
+ * @return the netif on which to send to reach dest
+ */
+struct netif *
+ip_route(ip_addr_t *dest)
+{
+ struct netif *netif;
+
+ /* iterate through netifs */
+ for(netif = netif_list; netif != NULL; netif = netif->next) {
+ /* network mask matches? */
+ if (netif_is_up(netif)) {
+ if (ip_addr_netcmp(dest, &(netif->ip_addr), &(netif->netmask))) {
+ /* return netif on which to forward IP packet */
+ return netif;
+ }
+ }
+ }
+ if ((netif_default == NULL) || (!netif_is_up(netif_default))) {
+ LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_route: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
+ IP_STATS_INC(ip.rterr);
+ snmp_inc_ipoutnoroutes();
+ return NULL;
+ }
+ /* no matching netif found, use default netif */
+ return netif_default;
+}
+
+#if IP_FORWARD
+/**
+ * Forwards an IP packet. It finds an appropriate route for the
+ * packet, decrements the TTL value of the packet, adjusts the
+ * checksum and outputs the packet on the appropriate interface.
+ *
+ * @param p the packet to forward (p->payload points to IP header)
+ * @param iphdr the IP header of the input packet
+ * @param inp the netif on which this packet was received
+ */
+static void
+ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
+{
+ struct netif *netif;
+
+ PERF_START;
+
+ /* RFC3927 2.7: do not forward link-local addresses */
+ if (ip_addr_islinklocal(¤t_iphdr_dest)) {
+ LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not forwarding LLA %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ ip4_addr1_16(¤t_iphdr_dest), ip4_addr2_16(¤t_iphdr_dest),
+ ip4_addr3_16(¤t_iphdr_dest), ip4_addr4_16(¤t_iphdr_dest)));
+ goto return_noroute;
+ }
+
+ /* Find network interface where to forward this IP packet to. */
+ netif = ip_route(¤t_iphdr_dest);
+ if (netif == NULL) {
+ LWIP_DEBUGF(IP_DEBUG, ("ip_forward: no forwarding route for %"U16_F".%"U16_F".%"U16_F".%"U16_F" found\n",
+ ip4_addr1_16(¤t_iphdr_dest), ip4_addr2_16(¤t_iphdr_dest),
+ ip4_addr3_16(¤t_iphdr_dest), ip4_addr4_16(¤t_iphdr_dest)));
+ goto return_noroute;
+ }
+ /* Do not forward packets onto the same network interface on which
+ * they arrived. */
+ if (netif == inp) {
+ LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not bouncing packets back on incoming interface.\n"));
+ goto return_noroute;
+ }
+
+ /* decrement TTL */
+ IPH_TTL_SET(iphdr, IPH_TTL(iphdr) - 1);
+ /* send ICMP if TTL == 0 */
+ if (IPH_TTL(iphdr) == 0) {
+ snmp_inc_ipinhdrerrors();
+#if LWIP_ICMP
+ /* Don't send ICMP messages in response to ICMP messages */
+ if (IPH_PROTO(iphdr) != IP_PROTO_ICMP) {
+ icmp_time_exceeded(p, ICMP_TE_TTL);
+ }
+#endif /* LWIP_ICMP */
+ return;
+ }
+
+ /* Incrementally update the IP checksum. */
+ if (IPH_CHKSUM(iphdr) >= PP_HTONS(0xffffU - 0x100)) {
+ IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + PP_HTONS(0x100) + 1);
+ } else {
+ IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + PP_HTONS(0x100));
+ }
+
+ LWIP_DEBUGF(IP_DEBUG, ("ip_forward: forwarding packet to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ ip4_addr1_16(¤t_iphdr_dest), ip4_addr2_16(¤t_iphdr_dest),
+ ip4_addr3_16(¤t_iphdr_dest), ip4_addr4_16(¤t_iphdr_dest)));
+
+ IP_STATS_INC(ip.fw);
+ IP_STATS_INC(ip.xmit);
+ snmp_inc_ipforwdatagrams();
+
+ PERF_STOP("ip_forward");
+ /* transmit pbuf on chosen interface */
+ netif->output(netif, p, ¤t_iphdr_dest);
+ return;
+return_noroute:
+ snmp_inc_ipoutnoroutes();
+}
+#endif /* IP_FORWARD */
+
+/**
+ * This function is called by the network interface device driver when
+ * an IP packet is received. The function does the basic checks of the
+ * IP header such as packet size being at least larger than the header
+ * size etc. If the packet was not destined for us, the packet is
+ * forwarded (using ip_forward). The IP checksum is always checked.
+ *
+ * Finally, the packet is sent to the upper layer protocol input function.
+ *
+ * @param p the received IP packet (p->payload points to IP header)
+ * @param inp the netif on which this packet was received
+ * @return ERR_OK if the packet was processed (could return ERR_* if it wasn't
+ * processed, but currently always returns ERR_OK)
+ */
+err_t
+ip_input(struct pbuf *p, struct netif *inp)
+{
+ struct ip_hdr *iphdr;
+ struct netif *netif;
+ u16_t iphdr_hlen;
+ u16_t iphdr_len;
+#if IP_ACCEPT_LINK_LAYER_ADDRESSING
+ int check_ip_src=1;
+#endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
+
+ IP_STATS_INC(ip.recv);
+ snmp_inc_ipinreceives();
+
+ /* identify the IP header */
+ iphdr = (struct ip_hdr *)p->payload;
+ if (IPH_V(iphdr) != 4) {
+ LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_WARNING, ("IP packet dropped due to bad version number %"U16_F"\n", IPH_V(iphdr)));
+ ip_debug_print(p);
+ pbuf_free(p);
+ IP_STATS_INC(ip.err);
+ IP_STATS_INC(ip.drop);
+ snmp_inc_ipinhdrerrors();
+ return ERR_OK;
+ }
+
+ /* obtain IP header length in number of 32-bit words */
+ iphdr_hlen = IPH_HL(iphdr);
+ /* calculate IP header length in bytes */
+ iphdr_hlen *= 4;
+ /* obtain ip length in bytes */
+ iphdr_len = ntohs(IPH_LEN(iphdr));
+
+ /* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
+ if ((iphdr_hlen > p->len) || (iphdr_len > p->tot_len)) {
+ if (iphdr_hlen > p->len) {
+ LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
+ ("IP header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n",
+ iphdr_hlen, p->len));
+ }
+ if (iphdr_len > p->tot_len) {
+ LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
+ ("IP (len %"U16_F") is longer than pbuf (len %"U16_F"), IP packet dropped.\n",
+ iphdr_len, p->tot_len));
+ }
+ /* free (drop) packet pbufs */
+ pbuf_free(p);
+ IP_STATS_INC(ip.lenerr);
+ IP_STATS_INC(ip.drop);
+ snmp_inc_ipindiscards();
+ return ERR_OK;
+ }
+
+ /* verify checksum */
+#if CHECKSUM_CHECK_IP
+ if (inet_chksum(iphdr, iphdr_hlen) != 0) {
+
+ LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
+ ("Checksum (0x%"X16_F") failed, IP packet dropped.\n", inet_chksum(iphdr, iphdr_hlen)));
+ ip_debug_print(p);
+ pbuf_free(p);
+ IP_STATS_INC(ip.chkerr);
+ IP_STATS_INC(ip.drop);
+ snmp_inc_ipinhdrerrors();
+ return ERR_OK;
+ }
+#endif
+
+ /* Trim pbuf. This should have been done at the netif layer,
+ * but we'll do it anyway just to be sure that its done. */
+ pbuf_realloc(p, iphdr_len);
+
+ /* copy IP addresses to aligned ip_addr_t */
+ ip_addr_copy(current_iphdr_dest, iphdr->dest);
+ ip_addr_copy(current_iphdr_src, iphdr->src);
+
+ /* match packet against an interface, i.e. is this packet for us? */
+#if LWIP_IGMP
+ if (ip_addr_ismulticast(¤t_iphdr_dest)) {
+ if ((inp->flags & NETIF_FLAG_IGMP) && (igmp_lookfor_group(inp, ¤t_iphdr_dest))) {
+ netif = inp;
+ } else {
+ netif = NULL;
+ }
+ } else
+#endif /* LWIP_IGMP */
+ {
+ /* start trying with inp. if that's not acceptable, start walking the
+ list of configured netifs.
+ 'first' is used as a boolean to mark whether we started walking the list */
+ int first = 1;
+ netif = inp;
+ do {
+ LWIP_DEBUGF(IP_DEBUG, ("ip_input: iphdr->dest 0x%"X32_F" netif->ip_addr 0x%"X32_F" (0x%"X32_F", 0x%"X32_F", 0x%"X32_F")\n",
+ ip4_addr_get_u32(&iphdr->dest), ip4_addr_get_u32(&netif->ip_addr),
+ ip4_addr_get_u32(&iphdr->dest) & ip4_addr_get_u32(&netif->netmask),
+ ip4_addr_get_u32(&netif->ip_addr) & ip4_addr_get_u32(&netif->netmask),
+ ip4_addr_get_u32(&iphdr->dest) & ~ip4_addr_get_u32(&netif->netmask)));
+
+ /* interface is up and configured? */
+ if ((netif_is_up(netif)) && (!ip_addr_isany(&(netif->ip_addr)))) {
+ /* unicast to this interface address? */
+ if (ip_addr_cmp(¤t_iphdr_dest, &(netif->ip_addr)) ||
+ /* or broadcast on this interface network address? */
+ ip_addr_isbroadcast(¤t_iphdr_dest, netif)) {
+ LWIP_DEBUGF(IP_DEBUG, ("ip_input: packet accepted on interface %c%c\n",
+ netif->name[0], netif->name[1]));
+ /* break out of for loop */
+ break;
+ }
+#if LWIP_AUTOIP
+ /* connections to link-local addresses must persist after changing
+ the netif's address (RFC3927 ch. 1.9) */
+ if ((netif->autoip != NULL) &&
+ ip_addr_cmp(¤t_iphdr_dest, &(netif->autoip->llipaddr))) {
+ LWIP_DEBUGF(IP_DEBUG, ("ip_input: LLA packet accepted on interface %c%c\n",
+ netif->name[0], netif->name[1]));
+ /* break out of for loop */
+ break;
+ }
+#endif /* LWIP_AUTOIP */
+ }
+ if (first) {
+ first = 0;
+ netif = netif_list;
+ } else {
+ netif = netif->next;
+ }
+ if (netif == inp) {
+ netif = netif->next;
+ }
+ } while(netif != NULL);
+ }
+
+#if IP_ACCEPT_LINK_LAYER_ADDRESSING
+ /* Pass DHCP messages regardless of destination address. DHCP traffic is addressed
+ * using link layer addressing (such as Ethernet MAC) so we must not filter on IP.
+ * According to RFC 1542 section 3.1.1, referred by RFC 2131).
+ *
+ * If you want to accept private broadcast communication while a netif is down,
+ * define LWIP_IP_ACCEPT_UDP_PORT(dst_port), e.g.:
+ *
+ * #define LWIP_IP_ACCEPT_UDP_PORT(dst_port) ((dst_port) == PP_NTOHS(12345))
+ */
+ if (netif == NULL) {
+ /* remote port is DHCP server? */
+ if (IPH_PROTO(iphdr) == IP_PROTO_UDP) {
+ struct udp_hdr *udphdr = (struct udp_hdr *)((u8_t *)iphdr + iphdr_hlen);
+ LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: UDP packet to DHCP client port %"U16_F"\n",
+ ntohs(udphdr->dest)));
+ if (IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(udphdr->dest)) {
+ LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: DHCP packet accepted.\n"));
+ netif = inp;
+ check_ip_src = 0;
+ }
+ }
+ }
+#endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
+
+ /* broadcast or multicast packet source address? Compliant with RFC 1122: 3.2.1.3 */
+#if IP_ACCEPT_LINK_LAYER_ADDRESSING
+ /* DHCP servers need 0.0.0.0 to be allowed as source address (RFC 1.1.2.2: 3.2.1.3/a) */
+ if (check_ip_src && !ip_addr_isany(¤t_iphdr_src))
+#endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
+ { if ((ip_addr_isbroadcast(¤t_iphdr_src, inp)) ||
+ (ip_addr_ismulticast(¤t_iphdr_src))) {
+ /* packet source is not valid */
+ LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("ip_input: packet source is not valid.\n"));
+ /* free (drop) packet pbufs */
+ pbuf_free(p);
+ IP_STATS_INC(ip.drop);
+ snmp_inc_ipinaddrerrors();
+ snmp_inc_ipindiscards();
+ return ERR_OK;
+ }
+ }
+
+ /* packet not for us? */
+ if (netif == NULL) {
+ /* packet not for us, route or discard */
+ LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: packet not for us.\n"));
+#if IP_FORWARD
+ /* non-broadcast packet? */
+ if (!ip_addr_isbroadcast(¤t_iphdr_dest, inp)) {
+ /* try to forward IP packet on (other) interfaces */
+ ip_forward(p, iphdr, inp);
+ } else
+#endif /* IP_FORWARD */
+ {
+ snmp_inc_ipinaddrerrors();
+ snmp_inc_ipindiscards();
+ }
+ pbuf_free(p);
+ return ERR_OK;
+ }
+ /* packet consists of multiple fragments? */
+ if ((IPH_OFFSET(iphdr) & PP_HTONS(IP_OFFMASK | IP_MF)) != 0) {
+#if IP_REASSEMBLY /* packet fragment reassembly code present? */
+ LWIP_DEBUGF(IP_DEBUG, ("IP packet is a fragment (id=0x%04"X16_F" tot_len=%"U16_F" len=%"U16_F" MF=%"U16_F" offset=%"U16_F"), calling ip_reass()\n",
+ ntohs(IPH_ID(iphdr)), p->tot_len, ntohs(IPH_LEN(iphdr)), !!(IPH_OFFSET(iphdr) & PP_HTONS(IP_MF)), (ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK)*8));
+ /* reassemble the packet*/
+ p = ip_reass(p);
+ /* packet not fully reassembled yet? */
+ if (p == NULL) {
+ return ERR_OK;
+ }
+ iphdr = (struct ip_hdr *)p->payload;
+#else /* IP_REASSEMBLY == 0, no packet fragment reassembly code present */
+ pbuf_free(p);
+ LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since it was fragmented (0x%"X16_F") (while IP_REASSEMBLY == 0).\n",
+ ntohs(IPH_OFFSET(iphdr))));
+ IP_STATS_INC(ip.opterr);
+ IP_STATS_INC(ip.drop);
+ /* unsupported protocol feature */
+ snmp_inc_ipinunknownprotos();
+ return ERR_OK;
+#endif /* IP_REASSEMBLY */
+ }
+
+#if IP_OPTIONS_ALLOWED == 0 /* no support for IP options in the IP header? */
+
+#if LWIP_IGMP
+ /* there is an extra "router alert" option in IGMP messages which we allow for but do not police */
+ if((iphdr_hlen > IP_HLEN) && (IPH_PROTO(iphdr) != IP_PROTO_IGMP)) {
+#else
+ if (iphdr_hlen > IP_HLEN) {
+#endif /* LWIP_IGMP */
+ LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since there were IP options (while IP_OPTIONS_ALLOWED == 0).\n"));
+ pbuf_free(p);
+ IP_STATS_INC(ip.opterr);
+ IP_STATS_INC(ip.drop);
+ /* unsupported protocol feature */
+ snmp_inc_ipinunknownprotos();
+ return ERR_OK;
+ }
+#endif /* IP_OPTIONS_ALLOWED == 0 */
+
+ /* send to upper layers */
+ LWIP_DEBUGF(IP_DEBUG, ("ip_input: \n"));
+ ip_debug_print(p);
+ LWIP_DEBUGF(IP_DEBUG, ("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
+
+ current_netif = inp;
+ current_header = iphdr;
+
+#if LWIP_RAW
+ /* raw input did not eat the packet? */
+ if (raw_input(p, inp) == 0)
+#endif /* LWIP_RAW */
+ {
+
+ switch (IPH_PROTO(iphdr)) {
+#if LWIP_UDP
+ case IP_PROTO_UDP:
+#if LWIP_UDPLITE
+ case IP_PROTO_UDPLITE:
+#endif /* LWIP_UDPLITE */
+ snmp_inc_ipindelivers();
+ udp_input(p, inp);
+ break;
+#endif /* LWIP_UDP */
+#if LWIP_TCP
+ case IP_PROTO_TCP:
+ snmp_inc_ipindelivers();
+ tcp_input(p, inp);
+ break;
+#endif /* LWIP_TCP */
+#if LWIP_ICMP
+ case IP_PROTO_ICMP:
+ snmp_inc_ipindelivers();
+ icmp_input(p, inp);
+ break;
+#endif /* LWIP_ICMP */
+#if LWIP_IGMP
+ case IP_PROTO_IGMP:
+ igmp_input(p, inp, ¤t_iphdr_dest);
+ break;
+#endif /* LWIP_IGMP */
+ default:
+#if LWIP_ICMP
+ /* send ICMP destination protocol unreachable unless is was a broadcast */
+ if (!ip_addr_isbroadcast(¤t_iphdr_dest, inp) &&
+ !ip_addr_ismulticast(¤t_iphdr_dest)) {
+ p->payload = iphdr;
+ icmp_dest_unreach(p, ICMP_DUR_PROTO);
+ }
+#endif /* LWIP_ICMP */
+ pbuf_free(p);
+
+ LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("Unsupported transport protocol %"U16_F"\n", IPH_PROTO(iphdr)));
+
+ IP_STATS_INC(ip.proterr);
+ IP_STATS_INC(ip.drop);
+ snmp_inc_ipinunknownprotos();
+ }
+ }
+
+ current_netif = NULL;
+ current_header = NULL;
+ ip_addr_set_any(¤t_iphdr_src);
+ ip_addr_set_any(¤t_iphdr_dest);
+
+ return ERR_OK;
+}
+
+/**
+ * Sends an IP packet on a network interface. This function constructs
+ * the IP header and calculates the IP header checksum. If the source
+ * IP address is NULL, the IP address of the outgoing network
+ * interface is filled in as source address.
+ * If the destination IP address is IP_HDRINCL, p is assumed to already
+ * include an IP header and p->payload points to it instead of the data.
+ *
+ * @param p the packet to send (p->payload points to the data, e.g. next
+ protocol header; if dest == IP_HDRINCL, p already includes an IP
+ header and p->payload points to that IP header)
+ * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
+ * IP address of the netif used to send is used as source address)
+ * @param dest the destination IP address to send the packet to
+ * @param ttl the TTL value to be set in the IP header
+ * @param tos the TOS value to be set in the IP header
+ * @param proto the PROTOCOL to be set in the IP header
+ * @param netif the netif on which to send this packet
+ * @return ERR_OK if the packet was sent OK
+ * ERR_BUF if p doesn't have enough space for IP/LINK headers
+ * returns errors returned by netif->output
+ *
+ * @note ip_id: RFC791 "some host may be able to simply use
+ * unique identifiers independent of destination"
+ */
+err_t
+ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
+ u8_t ttl, u8_t tos,
+ u8_t proto, struct netif *netif)
+{
+#if IP_OPTIONS_SEND
+ return ip_output_if_opt(p, src, dest, ttl, tos, proto, netif, NULL, 0);
+}
+
+/**
+ * Same as ip_output_if() but with the possibility to include IP options:
+ *
+ * @ param ip_options pointer to the IP options, copied into the IP header
+ * @ param optlen length of ip_options
+ */
+err_t ip_output_if_opt(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
+ u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options,
+ u16_t optlen)
+{
+#endif /* IP_OPTIONS_SEND */
+ struct ip_hdr *iphdr;
+ ip_addr_t dest_addr;
+#if CHECKSUM_GEN_IP_INLINE
+ u32_t chk_sum = 0;
+#endif /* CHECKSUM_GEN_IP_INLINE */
+
+ /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
+ gets altered as the packet is passed down the stack */
+ LWIP_ASSERT("p->ref == 1", p->ref == 1);
+
+ snmp_inc_ipoutrequests();
+
+ /* Should the IP header be generated or is it already included in p? */
+ if (dest != IP_HDRINCL) {
+ u16_t ip_hlen = IP_HLEN;
+#if IP_OPTIONS_SEND
+ u16_t optlen_aligned = 0;
+ if (optlen != 0) {
+#if CHECKSUM_GEN_IP_INLINE
+ int i;
+#endif /* CHECKSUM_GEN_IP_INLINE */
+ /* round up to a multiple of 4 */
+ optlen_aligned = ((optlen + 3) & ~3);
+ ip_hlen += optlen_aligned;
+ /* First write in the IP options */
+ if (pbuf_header(p, optlen_aligned)) {
+ LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_output_if_opt: not enough room for IP options in pbuf\n"));
+ IP_STATS_INC(ip.err);
+ snmp_inc_ipoutdiscards();
+ return ERR_BUF;
+ }
+ MEMCPY(p->payload, ip_options, optlen);
+ if (optlen < optlen_aligned) {
+ /* zero the remaining bytes */
+ memset(((char*)p->payload) + optlen, 0, optlen_aligned - optlen);
+ }
+#if CHECKSUM_GEN_IP_INLINE
+ for (i = 0; i < optlen_aligned/2; i++) {
+ chk_sum += ((u16_t*)p->payload)[i];
+ }
+#endif /* CHECKSUM_GEN_IP_INLINE */
+ }
+#endif /* IP_OPTIONS_SEND */
+ /* generate IP header */
+ if (pbuf_header(p, IP_HLEN)) {
+ LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_output: not enough room for IP header in pbuf\n"));
+
+ IP_STATS_INC(ip.err);
+ snmp_inc_ipoutdiscards();
+ return ERR_BUF;
+ }
+
+ iphdr = (struct ip_hdr *)p->payload;
+ LWIP_ASSERT("check that first pbuf can hold struct ip_hdr",
+ (p->len >= sizeof(struct ip_hdr)));
+
+ IPH_TTL_SET(iphdr, ttl);
+ IPH_PROTO_SET(iphdr, proto);
+#if CHECKSUM_GEN_IP_INLINE
+ chk_sum += LWIP_MAKE_U16(proto, ttl);
+#endif /* CHECKSUM_GEN_IP_INLINE */
+
+ /* dest cannot be NULL here */
+ ip_addr_copy(iphdr->dest, *dest);
+#if CHECKSUM_GEN_IP_INLINE
+ chk_sum += ip4_addr_get_u32(&iphdr->dest) & 0xFFFF;
+ chk_sum += ip4_addr_get_u32(&iphdr->dest) >> 16;
+#endif /* CHECKSUM_GEN_IP_INLINE */
+
+ IPH_VHLTOS_SET(iphdr, 4, ip_hlen / 4, tos);
+#if CHECKSUM_GEN_IP_INLINE
+ chk_sum += iphdr->_v_hl_tos;
+#endif /* CHECKSUM_GEN_IP_INLINE */
+ IPH_LEN_SET(iphdr, htons(p->tot_len));
+#if CHECKSUM_GEN_IP_INLINE
+ chk_sum += iphdr->_len;
+#endif /* CHECKSUM_GEN_IP_INLINE */
+ IPH_OFFSET_SET(iphdr, 0);
+ IPH_ID_SET(iphdr, htons(ip_id));
+#if CHECKSUM_GEN_IP_INLINE
+ chk_sum += iphdr->_id;
+#endif /* CHECKSUM_GEN_IP_INLINE */
+ ++ip_id;
+
+ if (ip_addr_isany(src)) {
+ ip_addr_copy(iphdr->src, netif->ip_addr);
+ } else {
+ /* src cannot be NULL here */
+ ip_addr_copy(iphdr->src, *src);
+ }
+
+#if CHECKSUM_GEN_IP_INLINE
+ chk_sum += ip4_addr_get_u32(&iphdr->src) & 0xFFFF;
+ chk_sum += ip4_addr_get_u32(&iphdr->src) >> 16;
+ chk_sum = (chk_sum >> 16) + (chk_sum & 0xFFFF);
+ chk_sum = (chk_sum >> 16) + chk_sum;
+ chk_sum = ~chk_sum;
+ iphdr->_chksum = chk_sum; /* network order */
+#else /* CHECKSUM_GEN_IP_INLINE */
+ IPH_CHKSUM_SET(iphdr, 0);
+#if CHECKSUM_GEN_IP
+ IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, ip_hlen));
+#endif
+#endif /* CHECKSUM_GEN_IP_INLINE */
+ } else {
+ /* IP header already included in p */
+ iphdr = (struct ip_hdr *)p->payload;
+ ip_addr_copy(dest_addr, iphdr->dest);
+ dest = &dest_addr;
+ }
+
+ IP_STATS_INC(ip.xmit);
+
+ LWIP_DEBUGF(IP_DEBUG, ("ip_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], netif->num));
+ ip_debug_print(p);
+
+#if ENABLE_LOOPBACK
+ if (ip_addr_cmp(dest, &netif->ip_addr)) {
+ /* Packet to self, enqueue it for loopback */
+ LWIP_DEBUGF(IP_DEBUG, ("netif_loop_output()"));
+ return netif_loop_output(netif, p, dest);
+ }
+#if LWIP_IGMP
+ if ((p->flags & PBUF_FLAG_MCASTLOOP) != 0) {
+ netif_loop_output(netif, p, dest);
+ }
+#endif /* LWIP_IGMP */
+#endif /* ENABLE_LOOPBACK */
+#if IP_FRAG
+ /* don't fragment if interface has mtu set to 0 [loopif] */
+ if (netif->mtu && (p->tot_len > netif->mtu)) {
+ return ip_frag(p, netif, dest);
+ }
+#endif /* IP_FRAG */
+
+ LWIP_DEBUGF(IP_DEBUG, ("netif->output()"));
+ return netif->output(netif, p, dest);
+}
+
+/**
+ * Simple interface to ip_output_if. It finds the outgoing network
+ * interface and calls upon ip_output_if to do the actual work.
+ *
+ * @param p the packet to send (p->payload points to the data, e.g. next
+ protocol header; if dest == IP_HDRINCL, p already includes an IP
+ header and p->payload points to that IP header)
+ * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
+ * IP address of the netif used to send is used as source address)
+ * @param dest the destination IP address to send the packet to
+ * @param ttl the TTL value to be set in the IP header
+ * @param tos the TOS value to be set in the IP header
+ * @param proto the PROTOCOL to be set in the IP header
+ *
+ * @return ERR_RTE if no route is found
+ * see ip_output_if() for more return values
+ */
+err_t
+ip_output(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
+ u8_t ttl, u8_t tos, u8_t proto)
+{
+ struct netif *netif;
+
+ /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
+ gets altered as the packet is passed down the stack */
+ LWIP_ASSERT("p->ref == 1", p->ref == 1);
+
+ if ((netif = ip_route(dest)) == NULL) {
+ LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
+ IP_STATS_INC(ip.rterr);
+ return ERR_RTE;
+ }
+
+ return ip_output_if(p, src, dest, ttl, tos, proto, netif);
+}
+
+#if LWIP_NETIF_HWADDRHINT
+/** Like ip_output, but takes and addr_hint pointer that is passed on to netif->addr_hint
+ * before calling ip_output_if.
+ *
+ * @param p the packet to send (p->payload points to the data, e.g. next
+ protocol header; if dest == IP_HDRINCL, p already includes an IP
+ header and p->payload points to that IP header)
+ * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
+ * IP address of the netif used to send is used as source address)
+ * @param dest the destination IP address to send the packet to
+ * @param ttl the TTL value to be set in the IP header
+ * @param tos the TOS value to be set in the IP header
+ * @param proto the PROTOCOL to be set in the IP header
+ * @param addr_hint address hint pointer set to netif->addr_hint before
+ * calling ip_output_if()
+ *
+ * @return ERR_RTE if no route is found
+ * see ip_output_if() for more return values
+ */
+err_t
+ip_output_hinted(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
+ u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint)
+{
+ struct netif *netif;
+ err_t err;
+
+ /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
+ gets altered as the packet is passed down the stack */
+ LWIP_ASSERT("p->ref == 1", p->ref == 1);
+
+ if ((netif = ip_route(dest)) == NULL) {
+ LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
+ IP_STATS_INC(ip.rterr);
+ return ERR_RTE;
+ }
+
+ netif->addr_hint = addr_hint;
+ err = ip_output_if(p, src, dest, ttl, tos, proto, netif);
+ netif->addr_hint = NULL;
+
+ return err;
+}
+#endif /* LWIP_NETIF_HWADDRHINT*/
+
+#if IP_DEBUG
+/* Print an IP header by using LWIP_DEBUGF
+ * @param p an IP packet, p->payload pointing to the IP header
+ */
+void
+ip_debug_print(struct pbuf *p)
+{
+ struct ip_hdr *iphdr = (struct ip_hdr *)p->payload;
+ u8_t *payload;
+
+ payload = (u8_t *)iphdr + IP_HLEN;
+
+ LWIP_DEBUGF(IP_DEBUG, ("IP header:\n"));
+ LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
+ LWIP_DEBUGF(IP_DEBUG, ("|%2"S16_F" |%2"S16_F" | 0x%02"X16_F" | %5"U16_F" | (v, hl, tos, len)\n",
+ IPH_V(iphdr),
+ IPH_HL(iphdr),
+ IPH_TOS(iphdr),
+ ntohs(IPH_LEN(iphdr))));
+ LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
+ LWIP_DEBUGF(IP_DEBUG, ("| %5"U16_F" |%"U16_F"%"U16_F"%"U16_F"| %4"U16_F" | (id, flags, offset)\n",
+ ntohs(IPH_ID(iphdr)),
+ ntohs(IPH_OFFSET(iphdr)) >> 15 & 1,
+ ntohs(IPH_OFFSET(iphdr)) >> 14 & 1,
+ ntohs(IPH_OFFSET(iphdr)) >> 13 & 1,
+ ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK));
+ LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
+ LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | 0x%04"X16_F" | (ttl, proto, chksum)\n",
+ IPH_TTL(iphdr),
+ IPH_PROTO(iphdr),
+ ntohs(IPH_CHKSUM(iphdr))));
+ LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
+ LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (src)\n",
+ ip4_addr1_16(&iphdr->src),
+ ip4_addr2_16(&iphdr->src),
+ ip4_addr3_16(&iphdr->src),
+ ip4_addr4_16(&iphdr->src)));
+ LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
+ LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (dest)\n",
+ ip4_addr1_16(&iphdr->dest),
+ ip4_addr2_16(&iphdr->dest),
+ ip4_addr3_16(&iphdr->dest),
+ ip4_addr4_16(&iphdr->dest)));
+ LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
+}
+#endif /* IP_DEBUG */
--- /dev/null
+/**
+ * @file
+ * This is the IPv4 address tools implementation.
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+#include "lwip/ip_addr.h"
+#include "lwip/netif.h"
+
+/* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
+const ip_addr_t ip_addr_any = { IPADDR_ANY };
+const ip_addr_t ip_addr_broadcast = { IPADDR_BROADCAST };
+
+/**
+ * Determine if an address is a broadcast address on a network interface
+ *
+ * @param addr address to be checked
+ * @param netif the network interface against which the address is checked
+ * @return returns non-zero if the address is a broadcast address
+ */
+u8_t
+ip4_addr_isbroadcast(u32_t addr, const struct netif *netif)
+{
+ ip_addr_t ipaddr;
+ ip4_addr_set_u32(&ipaddr, addr);
+
+ /* all ones (broadcast) or all zeroes (old skool broadcast) */
+ if ((~addr == IPADDR_ANY) ||
+ (addr == IPADDR_ANY)) {
+ return 1;
+ /* no broadcast support on this network interface? */
+ } else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0) {
+ /* the given address cannot be a broadcast address
+ * nor can we check against any broadcast addresses */
+ return 0;
+ /* address matches network interface address exactly? => no broadcast */
+ } else if (addr == ip4_addr_get_u32(&netif->ip_addr)) {
+ return 0;
+ /* on the same (sub) network... */
+ } else if (ip_addr_netcmp(&ipaddr, &(netif->ip_addr), &(netif->netmask))
+ /* ...and host identifier bits are all ones? =>... */
+ && ((addr & ~ip4_addr_get_u32(&netif->netmask)) ==
+ (IPADDR_BROADCAST & ~ip4_addr_get_u32(&netif->netmask)))) {
+ /* => network broadcast address */
+ return 1;
+ } else {
+ return 0;
+ }
+}
+
+/** Checks if a netmask is valid (starting with ones, then only zeros)
+ *
+ * @param netmask the IPv4 netmask to check (in network byte order!)
+ * @return 1 if the netmask is valid, 0 if it is not
+ */
+u8_t
+ip4_addr_netmask_valid(u32_t netmask)
+{
+ u32_t mask;
+ u32_t nm_hostorder = lwip_htonl(netmask);
+
+ /* first, check for the first zero */
+ for (mask = 1UL << 31 ; mask != 0; mask >>= 1) {
+ if ((nm_hostorder & mask) == 0) {
+ break;
+ }
+ }
+ /* then check that there is no one */
+ for (; mask != 0; mask >>= 1) {
+ if ((nm_hostorder & mask) != 0) {
+ /* there is a one after the first zero -> invalid */
+ return 0;
+ }
+ }
+ /* no one after the first zero -> valid */
+ return 1;
+}
+
+/* Here for now until needed in other places in lwIP */
+#ifndef isprint
+#define in_range(c, lo, up) ((u8_t)c >= lo && (u8_t)c <= up)
+#define isprint(c) in_range(c, 0x20, 0x7f)
+#define isdigit(c) in_range(c, '0', '9')
+#define isxdigit(c) (isdigit(c) || in_range(c, 'a', 'f') || in_range(c, 'A', 'F'))
+#define islower(c) in_range(c, 'a', 'z')
+#define isspace(c) (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v')
+#endif
+
+/**
+ * Ascii internet address interpretation routine.
+ * The value returned is in network order.
+ *
+ * @param cp IP address in ascii represenation (e.g. "127.0.0.1")
+ * @return ip address in network order
+ */
+u32_t
+ipaddr_addr(const char *cp)
+{
+ ip_addr_t val;
+
+ if (ipaddr_aton(cp, &val)) {
+ return ip4_addr_get_u32(&val);
+ }
+ return (IPADDR_NONE);
+}
+
+/**
+ * Check whether "cp" is a valid ascii representation
+ * of an Internet address and convert to a binary address.
+ * Returns 1 if the address is valid, 0 if not.
+ * This replaces inet_addr, the return value from which
+ * cannot distinguish between failure and a local broadcast address.
+ *
+ * @param cp IP address in ascii represenation (e.g. "127.0.0.1")
+ * @param addr pointer to which to save the ip address in network order
+ * @return 1 if cp could be converted to addr, 0 on failure
+ */
+int
+ipaddr_aton(const char *cp, ip_addr_t *addr)
+{
+ u32_t val;
+ u8_t base;
+ char c;
+ u32_t parts[4];
+ u32_t *pp = parts;
+
+ c = *cp;
+ for (;;) {
+ /*
+ * Collect number up to ``.''.
+ * Values are specified as for C:
+ * 0x=hex, 0=octal, 1-9=decimal.
+ */
+ if (!isdigit(c))
+ return (0);
+ val = 0;
+ base = 10;
+ if (c == '0') {
+ c = *++cp;
+ if (c == 'x' || c == 'X') {
+ base = 16;
+ c = *++cp;
+ } else
+ base = 8;
+ }
+ for (;;) {
+ if (isdigit(c)) {
+ val = (val * base) + (int)(c - '0');
+ c = *++cp;
+ } else if (base == 16 && isxdigit(c)) {
+ val = (val << 4) | (int)(c + 10 - (islower(c) ? 'a' : 'A'));
+ c = *++cp;
+ } else
+ break;
+ }
+ if (c == '.') {
+ /*
+ * Internet format:
+ * a.b.c.d
+ * a.b.c (with c treated as 16 bits)
+ * a.b (with b treated as 24 bits)
+ */
+ if (pp >= parts + 3) {
+ return (0);
+ }
+ *pp++ = val;
+ c = *++cp;
+ } else
+ break;
+ }
+ /*
+ * Check for trailing characters.
+ */
+ if (c != '\0' && !isspace(c)) {
+ return (0);
+ }
+ /*
+ * Concoct the address according to
+ * the number of parts specified.
+ */
+ switch (pp - parts + 1) {
+
+ case 0:
+ return (0); /* initial nondigit */
+
+ case 1: /* a -- 32 bits */
+ break;
+
+ case 2: /* a.b -- 8.24 bits */
+ if (val > 0xffffffUL) {
+ return (0);
+ }
+ val |= parts[0] << 24;
+ break;
+
+ case 3: /* a.b.c -- 8.8.16 bits */
+ if (val > 0xffff) {
+ return (0);
+ }
+ val |= (parts[0] << 24) | (parts[1] << 16);
+ break;
+
+ case 4: /* a.b.c.d -- 8.8.8.8 bits */
+ if (val > 0xff) {
+ return (0);
+ }
+ val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
+ break;
+ default:
+ LWIP_ASSERT("unhandled", 0);
+ break;
+ }
+ if (addr) {
+ ip4_addr_set_u32(addr, htonl(val));
+ }
+ return (1);
+}
+
+/**
+ * Convert numeric IP address into decimal dotted ASCII representation.
+ * returns ptr to static buffer; not reentrant!
+ *
+ * @param addr ip address in network order to convert
+ * @return pointer to a global static (!) buffer that holds the ASCII
+ * represenation of addr
+ */
+char *
+ipaddr_ntoa(const ip_addr_t *addr)
+{
+ static char str[16];
+ return ipaddr_ntoa_r(addr, str, 16);
+}
+
+/**
+ * Same as ipaddr_ntoa, but reentrant since a user-supplied buffer is used.
+ *
+ * @param addr ip address in network order to convert
+ * @param buf target buffer where the string is stored
+ * @param buflen length of buf
+ * @return either pointer to buf which now holds the ASCII
+ * representation of addr or NULL if buf was too small
+ */
+char *ipaddr_ntoa_r(const ip_addr_t *addr, char *buf, int buflen)
+{
+ u32_t s_addr;
+ char inv[3];
+ char *rp;
+ u8_t *ap;
+ u8_t rem;
+ u8_t n;
+ u8_t i;
+ int len = 0;
+
+ s_addr = ip4_addr_get_u32(addr);
+
+ rp = buf;
+ ap = (u8_t *)&s_addr;
+ for(n = 0; n < 4; n++) {
+ i = 0;
+ do {
+ rem = *ap % (u8_t)10;
+ *ap /= (u8_t)10;
+ inv[i++] = '0' + rem;
+ } while(*ap);
+ while(i--) {
+ if (len++ >= buflen) {
+ return NULL;
+ }
+ *rp++ = inv[i];
+ }
+ if (len++ >= buflen) {
+ return NULL;
+ }
+ *rp++ = '.';
+ ap++;
+ }
+ *--rp = 0;
+ return buf;
+}
--- /dev/null
+/**
+ * @file
+ * This is the IPv4 packet segmentation and reassembly implementation.
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Jani Monoses <jani@iv.ro>
+ * Simon Goldschmidt
+ * original reassembly code by Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+#include "lwip/ip_frag.h"
+#include "lwip/def.h"
+#include "lwip/inet_chksum.h"
+#include "lwip/netif.h"
+#include "lwip/snmp.h"
+#include "lwip/stats.h"
+#include "lwip/icmp.h"
+
+#include <string.h>
+
+#if IP_REASSEMBLY
+/**
+ * The IP reassembly code currently has the following limitations:
+ * - IP header options are not supported
+ * - fragments must not overlap (e.g. due to different routes),
+ * currently, overlapping or duplicate fragments are thrown away
+ * if IP_REASS_CHECK_OVERLAP=1 (the default)!
+ *
+ * @todo: work with IP header options
+ */
+
+/** Setting this to 0, you can turn off checking the fragments for overlapping
+ * regions. The code gets a little smaller. Only use this if you know that
+ * overlapping won't occur on your network! */
+#ifndef IP_REASS_CHECK_OVERLAP
+#define IP_REASS_CHECK_OVERLAP 1
+#endif /* IP_REASS_CHECK_OVERLAP */
+
+/** Set to 0 to prevent freeing the oldest datagram when the reassembly buffer is
+ * full (IP_REASS_MAX_PBUFS pbufs are enqueued). The code gets a little smaller.
+ * Datagrams will be freed by timeout only. Especially useful when MEMP_NUM_REASSDATA
+ * is set to 1, so one datagram can be reassembled at a time, only. */
+#ifndef IP_REASS_FREE_OLDEST
+#define IP_REASS_FREE_OLDEST 1
+#endif /* IP_REASS_FREE_OLDEST */
+
+#define IP_REASS_FLAG_LASTFRAG 0x01
+
+/** This is a helper struct which holds the starting
+ * offset and the ending offset of this fragment to
+ * easily chain the fragments.
+ * It has the same packing requirements as the IP header, since it replaces
+ * the IP header in memory in incoming fragments (after copying it) to keep
+ * track of the various fragments. (-> If the IP header doesn't need packing,
+ * this struct doesn't need packing, too.)
+ */
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+struct ip_reass_helper {
+ PACK_STRUCT_FIELD(struct pbuf *next_pbuf);
+ PACK_STRUCT_FIELD(u16_t start);
+ PACK_STRUCT_FIELD(u16_t end);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+
+#define IP_ADDRESSES_AND_ID_MATCH(iphdrA, iphdrB) \
+ (ip_addr_cmp(&(iphdrA)->src, &(iphdrB)->src) && \
+ ip_addr_cmp(&(iphdrA)->dest, &(iphdrB)->dest) && \
+ IPH_ID(iphdrA) == IPH_ID(iphdrB)) ? 1 : 0
+
+/* global variables */
+static struct ip_reassdata *reassdatagrams;
+static u16_t ip_reass_pbufcount;
+
+/* function prototypes */
+static void ip_reass_dequeue_datagram(struct ip_reassdata *ipr, struct ip_reassdata *prev);
+static int ip_reass_free_complete_datagram(struct ip_reassdata *ipr, struct ip_reassdata *prev);
+
+/**
+ * Reassembly timer base function
+ * for both NO_SYS == 0 and 1 (!).
+ *
+ * Should be called every 1000 msec (defined by IP_TMR_INTERVAL).
+ */
+void
+ip_reass_tmr(void)
+{
+ struct ip_reassdata *r, *prev = NULL;
+
+ r = reassdatagrams;
+ while (r != NULL) {
+ /* Decrement the timer. Once it reaches 0,
+ * clean up the incomplete fragment assembly */
+ if (r->timer > 0) {
+ r->timer--;
+ LWIP_DEBUGF(IP_REASS_DEBUG, ("ip_reass_tmr: timer dec %"U16_F"\n",(u16_t)r->timer));
+ prev = r;
+ r = r->next;
+ } else {
+ /* reassembly timed out */
+ struct ip_reassdata *tmp;
+ LWIP_DEBUGF(IP_REASS_DEBUG, ("ip_reass_tmr: timer timed out\n"));
+ tmp = r;
+ /* get the next pointer before freeing */
+ r = r->next;
+ /* free the helper struct and all enqueued pbufs */
+ ip_reass_free_complete_datagram(tmp, prev);
+ }
+ }
+}
+
+/**
+ * Free a datagram (struct ip_reassdata) and all its pbufs.
+ * Updates the total count of enqueued pbufs (ip_reass_pbufcount),
+ * SNMP counters and sends an ICMP time exceeded packet.
+ *
+ * @param ipr datagram to free
+ * @param prev the previous datagram in the linked list
+ * @return the number of pbufs freed
+ */
+static int
+ip_reass_free_complete_datagram(struct ip_reassdata *ipr, struct ip_reassdata *prev)
+{
+ u16_t pbufs_freed = 0;
+ u8_t clen;
+ struct pbuf *p;
+ struct ip_reass_helper *iprh;
+
+ LWIP_ASSERT("prev != ipr", prev != ipr);
+ if (prev != NULL) {
+ LWIP_ASSERT("prev->next == ipr", prev->next == ipr);
+ }
+
+ snmp_inc_ipreasmfails();
+#if LWIP_ICMP
+ iprh = (struct ip_reass_helper *)ipr->p->payload;
+ if (iprh->start == 0) {
+ /* The first fragment was received, send ICMP time exceeded. */
+ /* First, de-queue the first pbuf from r->p. */
+ p = ipr->p;
+ ipr->p = iprh->next_pbuf;
+ /* Then, copy the original header into it. */
+ SMEMCPY(p->payload, &ipr->iphdr, IP_HLEN);
+ icmp_time_exceeded(p, ICMP_TE_FRAG);
+ clen = pbuf_clen(p);
+ LWIP_ASSERT("pbufs_freed + clen <= 0xffff", pbufs_freed + clen <= 0xffff);
+ pbufs_freed += clen;
+ pbuf_free(p);
+ }
+#endif /* LWIP_ICMP */
+
+ /* First, free all received pbufs. The individual pbufs need to be released
+ separately as they have not yet been chained */
+ p = ipr->p;
+ while (p != NULL) {
+ struct pbuf *pcur;
+ iprh = (struct ip_reass_helper *)p->payload;
+ pcur = p;
+ /* get the next pointer before freeing */
+ p = iprh->next_pbuf;
+ clen = pbuf_clen(pcur);
+ LWIP_ASSERT("pbufs_freed + clen <= 0xffff", pbufs_freed + clen <= 0xffff);
+ pbufs_freed += clen;
+ pbuf_free(pcur);
+ }
+ /* Then, unchain the struct ip_reassdata from the list and free it. */
+ ip_reass_dequeue_datagram(ipr, prev);
+ LWIP_ASSERT("ip_reass_pbufcount >= clen", ip_reass_pbufcount >= pbufs_freed);
+ ip_reass_pbufcount -= pbufs_freed;
+
+ return pbufs_freed;
+}
+
+#if IP_REASS_FREE_OLDEST
+/**
+ * Free the oldest datagram to make room for enqueueing new fragments.
+ * The datagram 'fraghdr' belongs to is not freed!
+ *
+ * @param fraghdr IP header of the current fragment
+ * @param pbufs_needed number of pbufs needed to enqueue
+ * (used for freeing other datagrams if not enough space)
+ * @return the number of pbufs freed
+ */
+static int
+ip_reass_remove_oldest_datagram(struct ip_hdr *fraghdr, int pbufs_needed)
+{
+ /* @todo Can't we simply remove the last datagram in the
+ * linked list behind reassdatagrams?
+ */
+ struct ip_reassdata *r, *oldest, *prev;
+ int pbufs_freed = 0, pbufs_freed_current;
+ int other_datagrams;
+
+ /* Free datagrams until being allowed to enqueue 'pbufs_needed' pbufs,
+ * but don't free the datagram that 'fraghdr' belongs to! */
+ do {
+ oldest = NULL;
+ prev = NULL;
+ other_datagrams = 0;
+ r = reassdatagrams;
+ while (r != NULL) {
+ if (!IP_ADDRESSES_AND_ID_MATCH(&r->iphdr, fraghdr)) {
+ /* Not the same datagram as fraghdr */
+ other_datagrams++;
+ if (oldest == NULL) {
+ oldest = r;
+ } else if (r->timer <= oldest->timer) {
+ /* older than the previous oldest */
+ oldest = r;
+ }
+ }
+ if (r->next != NULL) {
+ prev = r;
+ }
+ r = r->next;
+ }
+ if (oldest != NULL) {
+ pbufs_freed_current = ip_reass_free_complete_datagram(oldest, prev);
+ pbufs_freed += pbufs_freed_current;
+ }
+ } while ((pbufs_freed < pbufs_needed) && (other_datagrams > 1));
+ return pbufs_freed;
+}
+#endif /* IP_REASS_FREE_OLDEST */
+
+/**
+ * Enqueues a new fragment into the fragment queue
+ * @param fraghdr points to the new fragments IP hdr
+ * @param clen number of pbufs needed to enqueue (used for freeing other datagrams if not enough space)
+ * @return A pointer to the queue location into which the fragment was enqueued
+ */
+static struct ip_reassdata*
+ip_reass_enqueue_new_datagram(struct ip_hdr *fraghdr, int clen)
+{
+ struct ip_reassdata* ipr;
+ /* No matching previous fragment found, allocate a new reassdata struct */
+ ipr = (struct ip_reassdata *)memp_malloc(MEMP_REASSDATA);
+ if (ipr == NULL) {
+#if IP_REASS_FREE_OLDEST
+ if (ip_reass_remove_oldest_datagram(fraghdr, clen) >= clen) {
+ ipr = (struct ip_reassdata *)memp_malloc(MEMP_REASSDATA);
+ }
+ if (ipr == NULL)
+#endif /* IP_REASS_FREE_OLDEST */
+ {
+ IPFRAG_STATS_INC(ip_frag.memerr);
+ LWIP_DEBUGF(IP_REASS_DEBUG,("Failed to alloc reassdata struct\n"));
+ return NULL;
+ }
+ }
+ memset(ipr, 0, sizeof(struct ip_reassdata));
+ ipr->timer = IP_REASS_MAXAGE;
+
+ /* enqueue the new structure to the front of the list */
+ ipr->next = reassdatagrams;
+ reassdatagrams = ipr;
+ /* copy the ip header for later tests and input */
+ /* @todo: no ip options supported? */
+ SMEMCPY(&(ipr->iphdr), fraghdr, IP_HLEN);
+ return ipr;
+}
+
+/**
+ * Dequeues a datagram from the datagram queue. Doesn't deallocate the pbufs.
+ * @param ipr points to the queue entry to dequeue
+ */
+static void
+ip_reass_dequeue_datagram(struct ip_reassdata *ipr, struct ip_reassdata *prev)
+{
+
+ /* dequeue the reass struct */
+ if (reassdatagrams == ipr) {
+ /* it was the first in the list */
+ reassdatagrams = ipr->next;
+ } else {
+ /* it wasn't the first, so it must have a valid 'prev' */
+ LWIP_ASSERT("sanity check linked list", prev != NULL);
+ prev->next = ipr->next;
+ }
+
+ /* now we can free the ip_reass struct */
+ memp_free(MEMP_REASSDATA, ipr);
+}
+
+/**
+ * Chain a new pbuf into the pbuf list that composes the datagram. The pbuf list
+ * will grow over time as new pbufs are rx.
+ * Also checks that the datagram passes basic continuity checks (if the last
+ * fragment was received at least once).
+ * @param root_p points to the 'root' pbuf for the current datagram being assembled.
+ * @param new_p points to the pbuf for the current fragment
+ * @return 0 if invalid, >0 otherwise
+ */
+static int
+ip_reass_chain_frag_into_datagram_and_validate(struct ip_reassdata *ipr, struct pbuf *new_p)
+{
+ struct ip_reass_helper *iprh, *iprh_tmp, *iprh_prev=NULL;
+ struct pbuf *q;
+ u16_t offset,len;
+ struct ip_hdr *fraghdr;
+ int valid = 1;
+
+ /* Extract length and fragment offset from current fragment */
+ fraghdr = (struct ip_hdr*)new_p->payload;
+ len = ntohs(IPH_LEN(fraghdr)) - IPH_HL(fraghdr) * 4;
+ offset = (ntohs(IPH_OFFSET(fraghdr)) & IP_OFFMASK) * 8;
+
+ /* overwrite the fragment's ip header from the pbuf with our helper struct,
+ * and setup the embedded helper structure. */
+ /* make sure the struct ip_reass_helper fits into the IP header */
+ LWIP_ASSERT("sizeof(struct ip_reass_helper) <= IP_HLEN",
+ sizeof(struct ip_reass_helper) <= IP_HLEN);
+ iprh = (struct ip_reass_helper*)new_p->payload;
+ iprh->next_pbuf = NULL;
+ iprh->start = offset;
+ iprh->end = offset + len;
+
+ /* Iterate through until we either get to the end of the list (append),
+ * or we find on with a larger offset (insert). */
+ for (q = ipr->p; q != NULL;) {
+ iprh_tmp = (struct ip_reass_helper*)q->payload;
+ if (iprh->start < iprh_tmp->start) {
+ /* the new pbuf should be inserted before this */
+ iprh->next_pbuf = q;
+ if (iprh_prev != NULL) {
+ /* not the fragment with the lowest offset */
+#if IP_REASS_CHECK_OVERLAP
+ if ((iprh->start < iprh_prev->end) || (iprh->end > iprh_tmp->start)) {
+ /* fragment overlaps with previous or following, throw away */
+ goto freepbuf;
+ }
+#endif /* IP_REASS_CHECK_OVERLAP */
+ iprh_prev->next_pbuf = new_p;
+ } else {
+ /* fragment with the lowest offset */
+ ipr->p = new_p;
+ }
+ break;
+ } else if(iprh->start == iprh_tmp->start) {
+ /* received the same datagram twice: no need to keep the datagram */
+ goto freepbuf;
+#if IP_REASS_CHECK_OVERLAP
+ } else if(iprh->start < iprh_tmp->end) {
+ /* overlap: no need to keep the new datagram */
+ goto freepbuf;
+#endif /* IP_REASS_CHECK_OVERLAP */
+ } else {
+ /* Check if the fragments received so far have no wholes. */
+ if (iprh_prev != NULL) {
+ if (iprh_prev->end != iprh_tmp->start) {
+ /* There is a fragment missing between the current
+ * and the previous fragment */
+ valid = 0;
+ }
+ }
+ }
+ q = iprh_tmp->next_pbuf;
+ iprh_prev = iprh_tmp;
+ }
+
+ /* If q is NULL, then we made it to the end of the list. Determine what to do now */
+ if (q == NULL) {
+ if (iprh_prev != NULL) {
+ /* this is (for now), the fragment with the highest offset:
+ * chain it to the last fragment */
+#if IP_REASS_CHECK_OVERLAP
+ LWIP_ASSERT("check fragments don't overlap", iprh_prev->end <= iprh->start);
+#endif /* IP_REASS_CHECK_OVERLAP */
+ iprh_prev->next_pbuf = new_p;
+ if (iprh_prev->end != iprh->start) {
+ valid = 0;
+ }
+ } else {
+#if IP_REASS_CHECK_OVERLAP
+ LWIP_ASSERT("no previous fragment, this must be the first fragment!",
+ ipr->p == NULL);
+#endif /* IP_REASS_CHECK_OVERLAP */
+ /* this is the first fragment we ever received for this ip datagram */
+ ipr->p = new_p;
+ }
+ }
+
+ /* At this point, the validation part begins: */
+ /* If we already received the last fragment */
+ if ((ipr->flags & IP_REASS_FLAG_LASTFRAG) != 0) {
+ /* and had no wholes so far */
+ if (valid) {
+ /* then check if the rest of the fragments is here */
+ /* Check if the queue starts with the first datagram */
+ if (((struct ip_reass_helper*)ipr->p->payload)->start != 0) {
+ valid = 0;
+ } else {
+ /* and check that there are no wholes after this datagram */
+ iprh_prev = iprh;
+ q = iprh->next_pbuf;
+ while (q != NULL) {
+ iprh = (struct ip_reass_helper*)q->payload;
+ if (iprh_prev->end != iprh->start) {
+ valid = 0;
+ break;
+ }
+ iprh_prev = iprh;
+ q = iprh->next_pbuf;
+ }
+ /* if still valid, all fragments are received
+ * (because to the MF==0 already arrived */
+ if (valid) {
+ LWIP_ASSERT("sanity check", ipr->p != NULL);
+ LWIP_ASSERT("sanity check",
+ ((struct ip_reass_helper*)ipr->p->payload) != iprh);
+ LWIP_ASSERT("validate_datagram:next_pbuf!=NULL",
+ iprh->next_pbuf == NULL);
+ LWIP_ASSERT("validate_datagram:datagram end!=datagram len",
+ iprh->end == ipr->datagram_len);
+ }
+ }
+ }
+ /* If valid is 0 here, there are some fragments missing in the middle
+ * (since MF == 0 has already arrived). Such datagrams simply time out if
+ * no more fragments are received... */
+ return valid;
+ }
+ /* If we come here, not all fragments were received, yet! */
+ return 0; /* not yet valid! */
+#if IP_REASS_CHECK_OVERLAP
+freepbuf:
+ ip_reass_pbufcount -= pbuf_clen(new_p);
+ pbuf_free(new_p);
+ return 0;
+#endif /* IP_REASS_CHECK_OVERLAP */
+}
+
+/**
+ * Reassembles incoming IP fragments into an IP datagram.
+ *
+ * @param p points to a pbuf chain of the fragment
+ * @return NULL if reassembly is incomplete, ? otherwise
+ */
+struct pbuf *
+ip_reass(struct pbuf *p)
+{
+ struct pbuf *r;
+ struct ip_hdr *fraghdr;
+ struct ip_reassdata *ipr;
+ struct ip_reass_helper *iprh;
+ u16_t offset, len;
+ u8_t clen;
+ struct ip_reassdata *ipr_prev = NULL;
+
+ IPFRAG_STATS_INC(ip_frag.recv);
+ snmp_inc_ipreasmreqds();
+
+ fraghdr = (struct ip_hdr*)p->payload;
+
+ if ((IPH_HL(fraghdr) * 4) != IP_HLEN) {
+ LWIP_DEBUGF(IP_REASS_DEBUG,("ip_reass: IP options currently not supported!\n"));
+ IPFRAG_STATS_INC(ip_frag.err);
+ goto nullreturn;
+ }
+
+ offset = (ntohs(IPH_OFFSET(fraghdr)) & IP_OFFMASK) * 8;
+ len = ntohs(IPH_LEN(fraghdr)) - IPH_HL(fraghdr) * 4;
+
+ /* Check if we are allowed to enqueue more datagrams. */
+ clen = pbuf_clen(p);
+ if ((ip_reass_pbufcount + clen) > IP_REASS_MAX_PBUFS) {
+#if IP_REASS_FREE_OLDEST
+ if (!ip_reass_remove_oldest_datagram(fraghdr, clen) ||
+ ((ip_reass_pbufcount + clen) > IP_REASS_MAX_PBUFS))
+#endif /* IP_REASS_FREE_OLDEST */
+ {
+ /* No datagram could be freed and still too many pbufs enqueued */
+ LWIP_DEBUGF(IP_REASS_DEBUG,("ip_reass: Overflow condition: pbufct=%d, clen=%d, MAX=%d\n",
+ ip_reass_pbufcount, clen, IP_REASS_MAX_PBUFS));
+ IPFRAG_STATS_INC(ip_frag.memerr);
+ /* @todo: send ICMP time exceeded here? */
+ /* drop this pbuf */
+ goto nullreturn;
+ }
+ }
+
+ /* Look for the datagram the fragment belongs to in the current datagram queue,
+ * remembering the previous in the queue for later dequeueing. */
+ for (ipr = reassdatagrams; ipr != NULL; ipr = ipr->next) {
+ /* Check if the incoming fragment matches the one currently present
+ in the reassembly buffer. If so, we proceed with copying the
+ fragment into the buffer. */
+ if (IP_ADDRESSES_AND_ID_MATCH(&ipr->iphdr, fraghdr)) {
+ LWIP_DEBUGF(IP_REASS_DEBUG, ("ip_reass: matching previous fragment ID=%"X16_F"\n",
+ ntohs(IPH_ID(fraghdr))));
+ IPFRAG_STATS_INC(ip_frag.cachehit);
+ break;
+ }
+ ipr_prev = ipr;
+ }
+
+ if (ipr == NULL) {
+ /* Enqueue a new datagram into the datagram queue */
+ ipr = ip_reass_enqueue_new_datagram(fraghdr, clen);
+ /* Bail if unable to enqueue */
+ if(ipr == NULL) {
+ goto nullreturn;
+ }
+ } else {
+ if (((ntohs(IPH_OFFSET(fraghdr)) & IP_OFFMASK) == 0) &&
+ ((ntohs(IPH_OFFSET(&ipr->iphdr)) & IP_OFFMASK) != 0)) {
+ /* ipr->iphdr is not the header from the first fragment, but fraghdr is
+ * -> copy fraghdr into ipr->iphdr since we want to have the header
+ * of the first fragment (for ICMP time exceeded and later, for copying
+ * all options, if supported)*/
+ SMEMCPY(&ipr->iphdr, fraghdr, IP_HLEN);
+ }
+ }
+ /* Track the current number of pbufs current 'in-flight', in order to limit
+ the number of fragments that may be enqueued at any one time */
+ ip_reass_pbufcount += clen;
+
+ /* At this point, we have either created a new entry or pointing
+ * to an existing one */
+
+ /* check for 'no more fragments', and update queue entry*/
+ if ((IPH_OFFSET(fraghdr) & PP_NTOHS(IP_MF)) == 0) {
+ ipr->flags |= IP_REASS_FLAG_LASTFRAG;
+ ipr->datagram_len = offset + len;
+ LWIP_DEBUGF(IP_REASS_DEBUG,
+ ("ip_reass: last fragment seen, total len %"S16_F"\n",
+ ipr->datagram_len));
+ }
+ /* find the right place to insert this pbuf */
+ /* @todo: trim pbufs if fragments are overlapping */
+ if (ip_reass_chain_frag_into_datagram_and_validate(ipr, p)) {
+ /* the totally last fragment (flag more fragments = 0) was received at least
+ * once AND all fragments are received */
+ ipr->datagram_len += IP_HLEN;
+
+ /* save the second pbuf before copying the header over the pointer */
+ r = ((struct ip_reass_helper*)ipr->p->payload)->next_pbuf;
+
+ /* copy the original ip header back to the first pbuf */
+ fraghdr = (struct ip_hdr*)(ipr->p->payload);
+ SMEMCPY(fraghdr, &ipr->iphdr, IP_HLEN);
+ IPH_LEN_SET(fraghdr, htons(ipr->datagram_len));
+ IPH_OFFSET_SET(fraghdr, 0);
+ IPH_CHKSUM_SET(fraghdr, 0);
+ /* @todo: do we need to set calculate the correct checksum? */
+ IPH_CHKSUM_SET(fraghdr, inet_chksum(fraghdr, IP_HLEN));
+
+ p = ipr->p;
+
+ /* chain together the pbufs contained within the reass_data list. */
+ while(r != NULL) {
+ iprh = (struct ip_reass_helper*)r->payload;
+
+ /* hide the ip header for every succeding fragment */
+ pbuf_header(r, -IP_HLEN);
+ pbuf_cat(p, r);
+ r = iprh->next_pbuf;
+ }
+ /* release the sources allocate for the fragment queue entry */
+ ip_reass_dequeue_datagram(ipr, ipr_prev);
+
+ /* and adjust the number of pbufs currently queued for reassembly. */
+ ip_reass_pbufcount -= pbuf_clen(p);
+
+ /* Return the pbuf chain */
+ return p;
+ }
+ /* the datagram is not (yet?) reassembled completely */
+ LWIP_DEBUGF(IP_REASS_DEBUG,("ip_reass_pbufcount: %d out\n", ip_reass_pbufcount));
+ return NULL;
+
+nullreturn:
+ LWIP_DEBUGF(IP_REASS_DEBUG,("ip_reass: nullreturn\n"));
+ IPFRAG_STATS_INC(ip_frag.drop);
+ pbuf_free(p);
+ return NULL;
+}
+#endif /* IP_REASSEMBLY */
+
+#if IP_FRAG
+#if IP_FRAG_USES_STATIC_BUF
+static u8_t buf[LWIP_MEM_ALIGN_SIZE(IP_FRAG_MAX_MTU + MEM_ALIGNMENT - 1)];
+#else /* IP_FRAG_USES_STATIC_BUF */
+
+#if !LWIP_NETIF_TX_SINGLE_PBUF
+/** Allocate a new struct pbuf_custom_ref */
+static struct pbuf_custom_ref*
+ip_frag_alloc_pbuf_custom_ref(void)
+{
+ return (struct pbuf_custom_ref*)memp_malloc(MEMP_FRAG_PBUF);
+}
+
+/** Free a struct pbuf_custom_ref */
+static void
+ip_frag_free_pbuf_custom_ref(struct pbuf_custom_ref* p)
+{
+ LWIP_ASSERT("p != NULL", p != NULL);
+ memp_free(MEMP_FRAG_PBUF, p);
+}
+
+/** Free-callback function to free a 'struct pbuf_custom_ref', called by
+ * pbuf_free. */
+static void
+ipfrag_free_pbuf_custom(struct pbuf *p)
+{
+ struct pbuf_custom_ref *pcr = (struct pbuf_custom_ref*)p;
+ LWIP_ASSERT("pcr != NULL", pcr != NULL);
+ LWIP_ASSERT("pcr == p", (void*)pcr == (void*)p);
+ if (pcr->original != NULL) {
+ pbuf_free(pcr->original);
+ }
+ ip_frag_free_pbuf_custom_ref(pcr);
+}
+#endif /* !LWIP_NETIF_TX_SINGLE_PBUF */
+#endif /* IP_FRAG_USES_STATIC_BUF */
+
+/**
+ * Fragment an IP datagram if too large for the netif.
+ *
+ * Chop the datagram in MTU sized chunks and send them in order
+ * by using a fixed size static memory buffer (PBUF_REF) or
+ * point PBUF_REFs into p (depending on IP_FRAG_USES_STATIC_BUF).
+ *
+ * @param p ip packet to send
+ * @param netif the netif on which to send
+ * @param dest destination ip address to which to send
+ *
+ * @return ERR_OK if sent successfully, err_t otherwise
+ */
+err_t
+ip_frag(struct pbuf *p, struct netif *netif, ip_addr_t *dest)
+{
+ struct pbuf *rambuf;
+#if IP_FRAG_USES_STATIC_BUF
+ struct pbuf *header;
+#else
+#if !LWIP_NETIF_TX_SINGLE_PBUF
+ struct pbuf *newpbuf;
+#endif
+ struct ip_hdr *original_iphdr;
+#endif
+ struct ip_hdr *iphdr;
+ u16_t nfb;
+ u16_t left, cop;
+ u16_t mtu = netif->mtu;
+ u16_t ofo, omf;
+ u16_t last;
+ u16_t poff = IP_HLEN;
+ u16_t tmp;
+#if !IP_FRAG_USES_STATIC_BUF && !LWIP_NETIF_TX_SINGLE_PBUF
+ u16_t newpbuflen = 0;
+ u16_t left_to_copy;
+#endif
+
+ /* Get a RAM based MTU sized pbuf */
+#if IP_FRAG_USES_STATIC_BUF
+ /* When using a static buffer, we use a PBUF_REF, which we will
+ * use to reference the packet (without link header).
+ * Layer and length is irrelevant.
+ */
+ rambuf = pbuf_alloc(PBUF_LINK, 0, PBUF_REF);
+ if (rambuf == NULL) {
+ LWIP_DEBUGF(IP_REASS_DEBUG, ("ip_frag: pbuf_alloc(PBUF_LINK, 0, PBUF_REF) failed\n"));
+ return ERR_MEM;
+ }
+ rambuf->tot_len = rambuf->len = mtu;
+ rambuf->payload = LWIP_MEM_ALIGN((void *)buf);
+
+ /* Copy the IP header in it */
+ iphdr = (struct ip_hdr *)rambuf->payload;
+ SMEMCPY(iphdr, p->payload, IP_HLEN);
+#else /* IP_FRAG_USES_STATIC_BUF */
+ original_iphdr = (struct ip_hdr *)p->payload;
+ iphdr = original_iphdr;
+#endif /* IP_FRAG_USES_STATIC_BUF */
+
+ /* Save original offset */
+ tmp = ntohs(IPH_OFFSET(iphdr));
+ ofo = tmp & IP_OFFMASK;
+ omf = tmp & IP_MF;
+
+ left = p->tot_len - IP_HLEN;
+
+ nfb = (mtu - IP_HLEN) / 8;
+
+ while (left) {
+ last = (left <= mtu - IP_HLEN);
+
+ /* Set new offset and MF flag */
+ tmp = omf | (IP_OFFMASK & (ofo));
+ if (!last) {
+ tmp = tmp | IP_MF;
+ }
+
+ /* Fill this fragment */
+ cop = last ? left : nfb * 8;
+
+#if IP_FRAG_USES_STATIC_BUF
+ poff += pbuf_copy_partial(p, (u8_t*)iphdr + IP_HLEN, cop, poff);
+#else /* IP_FRAG_USES_STATIC_BUF */
+#if LWIP_NETIF_TX_SINGLE_PBUF
+ rambuf = pbuf_alloc(PBUF_IP, cop, PBUF_RAM);
+ if (rambuf == NULL) {
+ return ERR_MEM;
+ }
+ LWIP_ASSERT("this needs a pbuf in one piece!",
+ (rambuf->len == rambuf->tot_len) && (rambuf->next == NULL));
+ poff += pbuf_copy_partial(p, rambuf->payload, cop, poff);
+ /* make room for the IP header */
+ if(pbuf_header(rambuf, IP_HLEN)) {
+ pbuf_free(rambuf);
+ return ERR_MEM;
+ }
+ /* fill in the IP header */
+ SMEMCPY(rambuf->payload, original_iphdr, IP_HLEN);
+ iphdr = rambuf->payload;
+#else /* LWIP_NETIF_TX_SINGLE_PBUF */
+ /* When not using a static buffer, create a chain of pbufs.
+ * The first will be a PBUF_RAM holding the link and IP header.
+ * The rest will be PBUF_REFs mirroring the pbuf chain to be fragged,
+ * but limited to the size of an mtu.
+ */
+ rambuf = pbuf_alloc(PBUF_LINK, IP_HLEN, PBUF_RAM);
+ if (rambuf == NULL) {
+ return ERR_MEM;
+ }
+ LWIP_ASSERT("this needs a pbuf in one piece!",
+ (p->len >= (IP_HLEN)));
+ SMEMCPY(rambuf->payload, original_iphdr, IP_HLEN);
+ iphdr = (struct ip_hdr *)rambuf->payload;
+
+ /* Can just adjust p directly for needed offset. */
+ p->payload = (u8_t *)p->payload + poff;
+ p->len -= poff;
+
+ left_to_copy = cop;
+ while (left_to_copy) {
+ struct pbuf_custom_ref *pcr;
+ newpbuflen = (left_to_copy < p->len) ? left_to_copy : p->len;
+ /* Is this pbuf already empty? */
+ if (!newpbuflen) {
+ p = p->next;
+ continue;
+ }
+ pcr = ip_frag_alloc_pbuf_custom_ref();
+ if (pcr == NULL) {
+ pbuf_free(rambuf);
+ return ERR_MEM;
+ }
+ /* Mirror this pbuf, although we might not need all of it. */
+ newpbuf = pbuf_alloced_custom(PBUF_RAW, newpbuflen, PBUF_REF, &pcr->pc, p->payload, newpbuflen);
+ if (newpbuf == NULL) {
+ ip_frag_free_pbuf_custom_ref(pcr);
+ pbuf_free(rambuf);
+ return ERR_MEM;
+ }
+ pbuf_ref(p);
+ pcr->original = p;
+ pcr->pc.custom_free_function = ipfrag_free_pbuf_custom;
+
+ /* Add it to end of rambuf's chain, but using pbuf_cat, not pbuf_chain
+ * so that it is removed when pbuf_dechain is later called on rambuf.
+ */
+ pbuf_cat(rambuf, newpbuf);
+ left_to_copy -= newpbuflen;
+ if (left_to_copy) {
+ p = p->next;
+ }
+ }
+ poff = newpbuflen;
+#endif /* LWIP_NETIF_TX_SINGLE_PBUF */
+#endif /* IP_FRAG_USES_STATIC_BUF */
+
+ /* Correct header */
+ IPH_OFFSET_SET(iphdr, htons(tmp));
+ IPH_LEN_SET(iphdr, htons(cop + IP_HLEN));
+ IPH_CHKSUM_SET(iphdr, 0);
+ IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, IP_HLEN));
+
+#if IP_FRAG_USES_STATIC_BUF
+ if (last) {
+ pbuf_realloc(rambuf, left + IP_HLEN);
+ }
+
+ /* This part is ugly: we alloc a RAM based pbuf for
+ * the link level header for each chunk and then
+ * free it.A PBUF_ROM style pbuf for which pbuf_header
+ * worked would make things simpler.
+ */
+ header = pbuf_alloc(PBUF_LINK, 0, PBUF_RAM);
+ if (header != NULL) {
+ pbuf_chain(header, rambuf);
+ netif->output(netif, header, dest);
+ IPFRAG_STATS_INC(ip_frag.xmit);
+ snmp_inc_ipfragcreates();
+ pbuf_free(header);
+ } else {
+ LWIP_DEBUGF(IP_REASS_DEBUG, ("ip_frag: pbuf_alloc() for header failed\n"));
+ pbuf_free(rambuf);
+ return ERR_MEM;
+ }
+#else /* IP_FRAG_USES_STATIC_BUF */
+ /* No need for separate header pbuf - we allowed room for it in rambuf
+ * when allocated.
+ */
+ netif->output(netif, rambuf, dest);
+ IPFRAG_STATS_INC(ip_frag.xmit);
+
+ /* Unfortunately we can't reuse rambuf - the hardware may still be
+ * using the buffer. Instead we free it (and the ensuing chain) and
+ * recreate it next time round the loop. If we're lucky the hardware
+ * will have already sent the packet, the free will really free, and
+ * there will be zero memory penalty.
+ */
+
+ pbuf_free(rambuf);
+#endif /* IP_FRAG_USES_STATIC_BUF */
+ left -= cop;
+ ofo += nfb;
+ }
+#if IP_FRAG_USES_STATIC_BUF
+ pbuf_free(rambuf);
+#endif /* IP_FRAG_USES_STATIC_BUF */
+ snmp_inc_ipfragoks();
+ return ERR_OK;
+}
+#endif /* IP_FRAG */
--- /dev/null
+/**
+ * @file
+ * Stack-internal timers implementation.
+ * This file includes timer callbacks for stack-internal timers as well as
+ * functions to set up or stop timers and check for expired timers.
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ * Simon Goldschmidt
+ *
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/timers.h"
+#include "lwip/tcp_impl.h"
+
+#if LWIP_TIMERS
+
+#include "lwip/def.h"
+#include "lwip/memp.h"
+#include "lwip/tcpip.h"
+
+#include "lwip/ip_frag.h"
+#include "netif/etharp.h"
+#include "lwip/dhcp.h"
+#include "lwip/autoip.h"
+#include "lwip/igmp.h"
+#include "lwip/dns.h"
+
+
+/** The one and only timeout list */
+static struct sys_timeo *next_timeout;
+#if NO_SYS
+static u32_t timeouts_last_time;
+#endif /* NO_SYS */
+
+#if LWIP_TCP
+/** global variable that shows if the tcp timer is currently scheduled or not */
+static int tcpip_tcp_timer_active;
+
+/**
+ * Timer callback function that calls tcp_tmr() and reschedules itself.
+ *
+ * @param arg unused argument
+ */
+static void
+tcpip_tcp_timer(void *arg)
+{
+ LWIP_UNUSED_ARG(arg);
+
+ /* call TCP timer handler */
+ tcp_tmr();
+ /* timer still needed? */
+ if (tcp_active_pcbs || tcp_tw_pcbs) {
+ /* restart timer */
+ sys_timeout(TCP_TMR_INTERVAL, tcpip_tcp_timer, NULL);
+ } else {
+ /* disable timer */
+ tcpip_tcp_timer_active = 0;
+ }
+}
+
+/**
+ * Called from TCP_REG when registering a new PCB:
+ * the reason is to have the TCP timer only running when
+ * there are active (or time-wait) PCBs.
+ */
+void
+tcp_timer_needed(void)
+{
+ /* timer is off but needed again? */
+ if (!tcpip_tcp_timer_active && (tcp_active_pcbs || tcp_tw_pcbs)) {
+ /* enable and start timer */
+ tcpip_tcp_timer_active = 1;
+ sys_timeout(TCP_TMR_INTERVAL, tcpip_tcp_timer, NULL);
+ }
+}
+#endif /* LWIP_TCP */
+
+#if IP_REASSEMBLY
+/**
+ * Timer callback function that calls ip_reass_tmr() and reschedules itself.
+ *
+ * @param arg unused argument
+ */
+static void
+ip_reass_timer(void *arg)
+{
+ LWIP_UNUSED_ARG(arg);
+ LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: ip_reass_tmr()\n"));
+ ip_reass_tmr();
+ sys_timeout(IP_TMR_INTERVAL, ip_reass_timer, NULL);
+}
+#endif /* IP_REASSEMBLY */
+
+#if LWIP_ARP
+/**
+ * Timer callback function that calls etharp_tmr() and reschedules itself.
+ *
+ * @param arg unused argument
+ */
+static void
+arp_timer(void *arg)
+{
+ LWIP_UNUSED_ARG(arg);
+ LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: etharp_tmr()\n"));
+ etharp_tmr();
+ sys_timeout(ARP_TMR_INTERVAL, arp_timer, NULL);
+}
+#endif /* LWIP_ARP */
+
+#if LWIP_DHCP
+/**
+ * Timer callback function that calls dhcp_coarse_tmr() and reschedules itself.
+ *
+ * @param arg unused argument
+ */
+static void
+dhcp_timer_coarse(void *arg)
+{
+ LWIP_UNUSED_ARG(arg);
+ LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: dhcp_coarse_tmr()\n"));
+ dhcp_coarse_tmr();
+ sys_timeout(DHCP_COARSE_TIMER_MSECS, dhcp_timer_coarse, NULL);
+}
+
+/**
+ * Timer callback function that calls dhcp_fine_tmr() and reschedules itself.
+ *
+ * @param arg unused argument
+ */
+static void
+dhcp_timer_fine(void *arg)
+{
+ LWIP_UNUSED_ARG(arg);
+ LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: dhcp_fine_tmr()\n"));
+ dhcp_fine_tmr();
+ sys_timeout(DHCP_FINE_TIMER_MSECS, dhcp_timer_fine, NULL);
+}
+#endif /* LWIP_DHCP */
+
+#if LWIP_AUTOIP
+/**
+ * Timer callback function that calls autoip_tmr() and reschedules itself.
+ *
+ * @param arg unused argument
+ */
+static void
+autoip_timer(void *arg)
+{
+ LWIP_UNUSED_ARG(arg);
+ LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: autoip_tmr()\n"));
+ autoip_tmr();
+ sys_timeout(AUTOIP_TMR_INTERVAL, autoip_timer, NULL);
+}
+#endif /* LWIP_AUTOIP */
+
+#if LWIP_IGMP
+/**
+ * Timer callback function that calls igmp_tmr() and reschedules itself.
+ *
+ * @param arg unused argument
+ */
+static void
+igmp_timer(void *arg)
+{
+ LWIP_UNUSED_ARG(arg);
+ LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: igmp_tmr()\n"));
+ igmp_tmr();
+ sys_timeout(IGMP_TMR_INTERVAL, igmp_timer, NULL);
+}
+#endif /* LWIP_IGMP */
+
+#if LWIP_DNS
+/**
+ * Timer callback function that calls dns_tmr() and reschedules itself.
+ *
+ * @param arg unused argument
+ */
+static void
+dns_timer(void *arg)
+{
+ LWIP_UNUSED_ARG(arg);
+ LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: dns_tmr()\n"));
+ dns_tmr();
+ sys_timeout(DNS_TMR_INTERVAL, dns_timer, NULL);
+}
+#endif /* LWIP_DNS */
+
+/** Initialize this module */
+void sys_timeouts_init(void)
+{
+#if IP_REASSEMBLY
+ sys_timeout(IP_TMR_INTERVAL, ip_reass_timer, NULL);
+#endif /* IP_REASSEMBLY */
+#if LWIP_ARP
+ sys_timeout(ARP_TMR_INTERVAL, arp_timer, NULL);
+#endif /* LWIP_ARP */
+#if LWIP_DHCP
+ sys_timeout(DHCP_COARSE_TIMER_MSECS, dhcp_timer_coarse, NULL);
+ sys_timeout(DHCP_FINE_TIMER_MSECS, dhcp_timer_fine, NULL);
+#endif /* LWIP_DHCP */
+#if LWIP_AUTOIP
+ sys_timeout(AUTOIP_TMR_INTERVAL, autoip_timer, NULL);
+#endif /* LWIP_AUTOIP */
+#if LWIP_IGMP
+ sys_timeout(IGMP_TMR_INTERVAL, igmp_timer, NULL);
+#endif /* LWIP_IGMP */
+#if LWIP_DNS
+ sys_timeout(DNS_TMR_INTERVAL, dns_timer, NULL);
+#endif /* LWIP_DNS */
+
+#if NO_SYS
+ /* Initialise timestamp for sys_check_timeouts */
+ timeouts_last_time = sys_now();
+#endif
+}
+
+/**
+ * Create a one-shot timer (aka timeout). Timeouts are processed in the
+ * following cases:
+ * - while waiting for a message using sys_timeouts_mbox_fetch()
+ * - by calling sys_check_timeouts() (NO_SYS==1 only)
+ *
+ * @param msecs time in milliseconds after that the timer should expire
+ * @param handler callback function to call when msecs have elapsed
+ * @param arg argument to pass to the callback function
+ */
+#if LWIP_DEBUG_TIMERNAMES
+void
+sys_timeout_debug(u32_t msecs, sys_timeout_handler handler, void *arg, const char* handler_name)
+#else /* LWIP_DEBUG_TIMERNAMES */
+void
+sys_timeout(u32_t msecs, sys_timeout_handler handler, void *arg)
+#endif /* LWIP_DEBUG_TIMERNAMES */
+{
+ struct sys_timeo *timeout, *t;
+
+ timeout = (struct sys_timeo *)memp_malloc(MEMP_SYS_TIMEOUT);
+ if (timeout == NULL) {
+ LWIP_ASSERT("sys_timeout: timeout != NULL, pool MEMP_SYS_TIMEOUT is empty", timeout != NULL);
+ return;
+ }
+ timeout->next = NULL;
+ timeout->h = handler;
+ timeout->arg = arg;
+ timeout->time = msecs;
+#if LWIP_DEBUG_TIMERNAMES
+ timeout->handler_name = handler_name;
+ LWIP_DEBUGF(TIMERS_DEBUG, ("sys_timeout: %p msecs=%"U32_F" handler=%s arg=%p\n",
+ (void *)timeout, msecs, handler_name, (void *)arg));
+#endif /* LWIP_DEBUG_TIMERNAMES */
+
+ if (next_timeout == NULL) {
+ next_timeout = timeout;
+ return;
+ }
+
+ if (next_timeout->time > msecs) {
+ next_timeout->time -= msecs;
+ timeout->next = next_timeout;
+ next_timeout = timeout;
+ } else {
+ for(t = next_timeout; t != NULL; t = t->next) {
+ timeout->time -= t->time;
+ if (t->next == NULL || t->next->time > timeout->time) {
+ if (t->next != NULL) {
+ t->next->time -= timeout->time;
+ }
+ timeout->next = t->next;
+ t->next = timeout;
+ break;
+ }
+ }
+ }
+}
+
+/**
+ * Go through timeout list (for this task only) and remove the first matching
+ * entry, even though the timeout has not triggered yet.
+ *
+ * @note This function only works as expected if there is only one timeout
+ * calling 'handler' in the list of timeouts.
+ *
+ * @param handler callback function that would be called by the timeout
+ * @param arg callback argument that would be passed to handler
+*/
+void
+sys_untimeout(sys_timeout_handler handler, void *arg)
+{
+ struct sys_timeo *prev_t, *t;
+
+ if (next_timeout == NULL) {
+ return;
+ }
+
+ for (t = next_timeout, prev_t = NULL; t != NULL; prev_t = t, t = t->next) {
+ if ((t->h == handler) && (t->arg == arg)) {
+ /* We have a match */
+ /* Unlink from previous in list */
+ if (prev_t == NULL) {
+ next_timeout = t->next;
+ } else {
+ prev_t->next = t->next;
+ }
+ /* If not the last one, add time of this one back to next */
+ if (t->next != NULL) {
+ t->next->time += t->time;
+ }
+ memp_free(MEMP_SYS_TIMEOUT, t);
+ return;
+ }
+ }
+ return;
+}
+
+#if NO_SYS
+
+/** Handle timeouts for NO_SYS==1 (i.e. without using
+ * tcpip_thread/sys_timeouts_mbox_fetch(). Uses sys_now() to call timeout
+ * handler functions when timeouts expire.
+ *
+ * Must be called periodically from your main loop.
+ */
+void
+sys_check_timeouts(void)
+{
+ struct sys_timeo *tmptimeout;
+ u32_t diff;
+ sys_timeout_handler handler;
+ void *arg;
+ int had_one;
+ u32_t now;
+
+ now = sys_now();
+ if (next_timeout) {
+ /* this cares for wraparounds */
+ diff = LWIP_U32_DIFF(now, timeouts_last_time);
+ do
+ {
+ had_one = 0;
+ tmptimeout = next_timeout;
+ if (tmptimeout->time <= diff) {
+ /* timeout has expired */
+ had_one = 1;
+ timeouts_last_time = now;
+ diff -= tmptimeout->time;
+ next_timeout = tmptimeout->next;
+ handler = tmptimeout->h;
+ arg = tmptimeout->arg;
+#if LWIP_DEBUG_TIMERNAMES
+ if (handler != NULL) {
+ LWIP_DEBUGF(TIMERS_DEBUG, ("sct calling h=%s arg=%p\n",
+ tmptimeout->handler_name, arg));
+ }
+#endif /* LWIP_DEBUG_TIMERNAMES */
+ memp_free(MEMP_SYS_TIMEOUT, tmptimeout);
+ if (handler != NULL) {
+ handler(arg);
+ }
+ }
+ /* repeat until all expired timers have been called */
+ }while(had_one);
+ }
+}
+
+/** Set back the timestamp of the last call to sys_check_timeouts()
+ * This is necessary if sys_check_timeouts() hasn't been called for a long
+ * time (e.g. while saving energy) to prevent all timer functions of that
+ * period being called.
+ */
+void
+sys_restart_timeouts(void)
+{
+ timeouts_last_time = sys_now();
+}
+
+#else /* NO_SYS */
+
+/**
+ * Wait (forever) for a message to arrive in an mbox.
+ * While waiting, timeouts are processed.
+ *
+ * @param mbox the mbox to fetch the message from
+ * @param msg the place to store the message
+ */
+void
+sys_timeouts_mbox_fetch(sys_mbox_t *mbox, void **msg)
+{
+ u32_t time_needed;
+ struct sys_timeo *tmptimeout;
+ sys_timeout_handler handler;
+ void *arg;
+
+ again:
+ if (!next_timeout) {
+ time_needed = sys_arch_mbox_fetch(mbox, msg, 0);
+ } else {
+ if (next_timeout->time > 0) {
+ time_needed = sys_arch_mbox_fetch(mbox, msg, next_timeout->time);
+ } else {
+ time_needed = SYS_ARCH_TIMEOUT;
+ }
+
+ if (time_needed == SYS_ARCH_TIMEOUT) {
+ /* If time == SYS_ARCH_TIMEOUT, a timeout occured before a message
+ could be fetched. We should now call the timeout handler and
+ deallocate the memory allocated for the timeout. */
+ tmptimeout = next_timeout;
+ next_timeout = tmptimeout->next;
+ handler = tmptimeout->h;
+ arg = tmptimeout->arg;
+#if LWIP_DEBUG_TIMERNAMES
+ if (handler != NULL) {
+ LWIP_DEBUGF(TIMERS_DEBUG, ("stmf calling h=%s arg=%p\n",
+ tmptimeout->handler_name, arg));
+ }
+#endif /* LWIP_DEBUG_TIMERNAMES */
+ memp_free(MEMP_SYS_TIMEOUT, tmptimeout);
+ if (handler != NULL) {
+ /* For LWIP_TCPIP_CORE_LOCKING, lock the core before calling the
+ timeout handler function. */
+ LOCK_TCPIP_CORE();
+ handler(arg);
+ UNLOCK_TCPIP_CORE();
+ }
+ LWIP_TCPIP_THREAD_ALIVE();
+
+ /* We try again to fetch a message from the mbox. */
+ goto again;
+ } else {
+ /* If time != SYS_ARCH_TIMEOUT, a message was received before the timeout
+ occured. The time variable is set to the number of
+ milliseconds we waited for the message. */
+ if (time_needed < next_timeout->time) {
+ next_timeout->time -= time_needed;
+ } else {
+ next_timeout->time = 0;
+ }
+ }
+ }
+}
+
+#endif /* NO_SYS */
+
+#else /* LWIP_TIMERS */
+/* Satisfy the TCP code which calls this function */
+void
+tcp_timer_needed(void)
+{
+}
+#endif /* LWIP_TIMERS */
--- /dev/null
+/**
+ * @file
+ * Dynamic memory manager
+ *
+ * This is a lightweight replacement for the standard C library malloc().
+ *
+ * If you want to use the standard C library malloc() instead, define
+ * MEM_LIBC_MALLOC to 1 in your lwipopts.h
+ *
+ * To let mem_malloc() use pools (prevents fragmentation and is much faster than
+ * a heap but might waste some memory), define MEM_USE_POOLS to 1, define
+ * MEM_USE_CUSTOM_POOLS to 1 and create a file "lwippools.h" that includes a list
+ * of pools like this (more pools can be added between _START and _END):
+ *
+ * Define three pools with sizes 256, 512, and 1512 bytes
+ * LWIP_MALLOC_MEMPOOL_START
+ * LWIP_MALLOC_MEMPOOL(20, 256)
+ * LWIP_MALLOC_MEMPOOL(10, 512)
+ * LWIP_MALLOC_MEMPOOL(5, 1512)
+ * LWIP_MALLOC_MEMPOOL_END
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ * Simon Goldschmidt
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if !MEM_LIBC_MALLOC /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/def.h"
+#include "lwip/mem.h"
+#include "lwip/sys.h"
+#include "lwip/stats.h"
+#include "lwip/err.h"
+
+#include <string.h>
+
+#if MEM_USE_POOLS
+/* lwIP head implemented with different sized pools */
+
+/**
+ * Allocate memory: determine the smallest pool that is big enough
+ * to contain an element of 'size' and get an element from that pool.
+ *
+ * @param size the size in bytes of the memory needed
+ * @return a pointer to the allocated memory or NULL if the pool is empty
+ */
+void *
+mem_malloc(mem_size_t size)
+{
+ struct memp_malloc_helper *element;
+ memp_t poolnr;
+ mem_size_t required_size = size + sizeof(struct memp_malloc_helper);
+
+ for (poolnr = MEMP_POOL_FIRST; poolnr <= MEMP_POOL_LAST; poolnr = (memp_t)(poolnr + 1)) {
+#if MEM_USE_POOLS_TRY_BIGGER_POOL
+again:
+#endif /* MEM_USE_POOLS_TRY_BIGGER_POOL */
+ /* is this pool big enough to hold an element of the required size
+ plus a struct memp_malloc_helper that saves the pool this element came from? */
+ if (required_size <= memp_sizes[poolnr]) {
+ break;
+ }
+ }
+ if (poolnr > MEMP_POOL_LAST) {
+ LWIP_ASSERT("mem_malloc(): no pool is that big!", 0);
+ return NULL;
+ }
+ element = (struct memp_malloc_helper*)memp_malloc(poolnr);
+ if (element == NULL) {
+ /* No need to DEBUGF or ASSERT: This error is already
+ taken care of in memp.c */
+#if MEM_USE_POOLS_TRY_BIGGER_POOL
+ /** Try a bigger pool if this one is empty! */
+ if (poolnr < MEMP_POOL_LAST) {
+ poolnr++;
+ goto again;
+ }
+#endif /* MEM_USE_POOLS_TRY_BIGGER_POOL */
+ return NULL;
+ }
+
+ /* save the pool number this element came from */
+ element->poolnr = poolnr;
+ /* and return a pointer to the memory directly after the struct memp_malloc_helper */
+ element++;
+
+ return element;
+}
+
+/**
+ * Free memory previously allocated by mem_malloc. Loads the pool number
+ * and calls memp_free with that pool number to put the element back into
+ * its pool
+ *
+ * @param rmem the memory element to free
+ */
+void
+mem_free(void *rmem)
+{
+ struct memp_malloc_helper *hmem = (struct memp_malloc_helper*)rmem;
+
+ LWIP_ASSERT("rmem != NULL", (rmem != NULL));
+ LWIP_ASSERT("rmem == MEM_ALIGN(rmem)", (rmem == LWIP_MEM_ALIGN(rmem)));
+
+ /* get the original struct memp_malloc_helper */
+ hmem--;
+
+ LWIP_ASSERT("hmem != NULL", (hmem != NULL));
+ LWIP_ASSERT("hmem == MEM_ALIGN(hmem)", (hmem == LWIP_MEM_ALIGN(hmem)));
+ LWIP_ASSERT("hmem->poolnr < MEMP_MAX", (hmem->poolnr < MEMP_MAX));
+
+ /* and put it in the pool we saved earlier */
+ memp_free(hmem->poolnr, hmem);
+}
+
+#else /* MEM_USE_POOLS */
+/* lwIP replacement for your libc malloc() */
+
+/**
+ * The heap is made up as a list of structs of this type.
+ * This does not have to be aligned since for getting its size,
+ * we only use the macro SIZEOF_STRUCT_MEM, which automatically alignes.
+ */
+struct mem {
+ /** index (-> ram[next]) of the next struct */
+ mem_size_t next;
+ /** index (-> ram[prev]) of the previous struct */
+ mem_size_t prev;
+ /** 1: this area is used; 0: this area is unused */
+ u8_t used;
+};
+
+/** All allocated blocks will be MIN_SIZE bytes big, at least!
+ * MIN_SIZE can be overridden to suit your needs. Smaller values save space,
+ * larger values could prevent too small blocks to fragment the RAM too much. */
+#ifndef MIN_SIZE
+#define MIN_SIZE 12
+#endif /* MIN_SIZE */
+/* some alignment macros: we define them here for better source code layout */
+#define MIN_SIZE_ALIGNED LWIP_MEM_ALIGN_SIZE(MIN_SIZE)
+#define SIZEOF_STRUCT_MEM LWIP_MEM_ALIGN_SIZE(sizeof(struct mem))
+#define MEM_SIZE_ALIGNED LWIP_MEM_ALIGN_SIZE(MEM_SIZE)
+
+/** If you want to relocate the heap to external memory, simply define
+ * LWIP_RAM_HEAP_POINTER as a void-pointer to that location.
+ * If so, make sure the memory at that location is big enough (see below on
+ * how that space is calculated). */
+#ifndef LWIP_RAM_HEAP_POINTER
+/** the heap. we need one struct mem at the end and some room for alignment */
+u8_t ram_heap[MEM_SIZE_ALIGNED + (2*SIZEOF_STRUCT_MEM) + MEM_ALIGNMENT];
+#define LWIP_RAM_HEAP_POINTER ram_heap
+#endif /* LWIP_RAM_HEAP_POINTER */
+
+/** pointer to the heap (ram_heap): for alignment, ram is now a pointer instead of an array */
+static u8_t *ram;
+/** the last entry, always unused! */
+static struct mem *ram_end;
+/** pointer to the lowest free block, this is used for faster search */
+static struct mem *lfree;
+
+/** concurrent access protection */
+static sys_mutex_t mem_mutex;
+
+#if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT
+
+static volatile u8_t mem_free_count;
+
+/* Allow mem_free from other (e.g. interrupt) context */
+#define LWIP_MEM_FREE_DECL_PROTECT() SYS_ARCH_DECL_PROTECT(lev_free)
+#define LWIP_MEM_FREE_PROTECT() SYS_ARCH_PROTECT(lev_free)
+#define LWIP_MEM_FREE_UNPROTECT() SYS_ARCH_UNPROTECT(lev_free)
+#define LWIP_MEM_ALLOC_DECL_PROTECT() SYS_ARCH_DECL_PROTECT(lev_alloc)
+#define LWIP_MEM_ALLOC_PROTECT() SYS_ARCH_PROTECT(lev_alloc)
+#define LWIP_MEM_ALLOC_UNPROTECT() SYS_ARCH_UNPROTECT(lev_alloc)
+
+#else /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */
+
+/* Protect the heap only by using a semaphore */
+#define LWIP_MEM_FREE_DECL_PROTECT()
+#define LWIP_MEM_FREE_PROTECT() sys_mutex_lock(&mem_mutex)
+#define LWIP_MEM_FREE_UNPROTECT() sys_mutex_unlock(&mem_mutex)
+/* mem_malloc is protected using semaphore AND LWIP_MEM_ALLOC_PROTECT */
+#define LWIP_MEM_ALLOC_DECL_PROTECT()
+#define LWIP_MEM_ALLOC_PROTECT()
+#define LWIP_MEM_ALLOC_UNPROTECT()
+
+#endif /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */
+
+
+/**
+ * "Plug holes" by combining adjacent empty struct mems.
+ * After this function is through, there should not exist
+ * one empty struct mem pointing to another empty struct mem.
+ *
+ * @param mem this points to a struct mem which just has been freed
+ * @internal this function is only called by mem_free() and mem_trim()
+ *
+ * This assumes access to the heap is protected by the calling function
+ * already.
+ */
+static void
+plug_holes(struct mem *mem)
+{
+ struct mem *nmem;
+ struct mem *pmem;
+
+ LWIP_ASSERT("plug_holes: mem >= ram", (u8_t *)mem >= ram);
+ LWIP_ASSERT("plug_holes: mem < ram_end", (u8_t *)mem < (u8_t *)ram_end);
+ LWIP_ASSERT("plug_holes: mem->used == 0", mem->used == 0);
+
+ /* plug hole forward */
+ LWIP_ASSERT("plug_holes: mem->next <= MEM_SIZE_ALIGNED", mem->next <= MEM_SIZE_ALIGNED);
+
+ nmem = (struct mem *)(void *)&ram[mem->next];
+ if (mem != nmem && nmem->used == 0 && (u8_t *)nmem != (u8_t *)ram_end) {
+ /* if mem->next is unused and not end of ram, combine mem and mem->next */
+ if (lfree == nmem) {
+ lfree = mem;
+ }
+ mem->next = nmem->next;
+ ((struct mem *)(void *)&ram[nmem->next])->prev = (mem_size_t)((u8_t *)mem - ram);
+ }
+
+ /* plug hole backward */
+ pmem = (struct mem *)(void *)&ram[mem->prev];
+ if (pmem != mem && pmem->used == 0) {
+ /* if mem->prev is unused, combine mem and mem->prev */
+ if (lfree == mem) {
+ lfree = pmem;
+ }
+ pmem->next = mem->next;
+ ((struct mem *)(void *)&ram[mem->next])->prev = (mem_size_t)((u8_t *)pmem - ram);
+ }
+}
+
+/**
+ * Zero the heap and initialize start, end and lowest-free
+ */
+void
+mem_init(void)
+{
+ struct mem *mem;
+
+ LWIP_ASSERT("Sanity check alignment",
+ (SIZEOF_STRUCT_MEM & (MEM_ALIGNMENT-1)) == 0);
+
+ /* align the heap */
+ ram = (u8_t *)LWIP_MEM_ALIGN(LWIP_RAM_HEAP_POINTER);
+ /* initialize the start of the heap */
+ mem = (struct mem *)(void *)ram;
+ mem->next = MEM_SIZE_ALIGNED;
+ mem->prev = 0;
+ mem->used = 0;
+ /* initialize the end of the heap */
+ ram_end = (struct mem *)(void *)&ram[MEM_SIZE_ALIGNED];
+ ram_end->used = 1;
+ ram_end->next = MEM_SIZE_ALIGNED;
+ ram_end->prev = MEM_SIZE_ALIGNED;
+
+ /* initialize the lowest-free pointer to the start of the heap */
+ lfree = (struct mem *)(void *)ram;
+
+ MEM_STATS_AVAIL(avail, MEM_SIZE_ALIGNED);
+
+ if(sys_mutex_new(&mem_mutex) != ERR_OK) {
+ LWIP_ASSERT("failed to create mem_mutex", 0);
+ }
+}
+
+/**
+ * Put a struct mem back on the heap
+ *
+ * @param rmem is the data portion of a struct mem as returned by a previous
+ * call to mem_malloc()
+ */
+void
+mem_free(void *rmem)
+{
+ struct mem *mem;
+ LWIP_MEM_FREE_DECL_PROTECT();
+
+ if (rmem == NULL) {
+ LWIP_DEBUGF(MEM_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("mem_free(p == NULL) was called.\n"));
+ return;
+ }
+ LWIP_ASSERT("mem_free: sanity check alignment", (((mem_ptr_t)rmem) & (MEM_ALIGNMENT-1)) == 0);
+
+ LWIP_ASSERT("mem_free: legal memory", (u8_t *)rmem >= (u8_t *)ram &&
+ (u8_t *)rmem < (u8_t *)ram_end);
+
+ if ((u8_t *)rmem < (u8_t *)ram || (u8_t *)rmem >= (u8_t *)ram_end) {
+ SYS_ARCH_DECL_PROTECT(lev);
+ LWIP_DEBUGF(MEM_DEBUG | LWIP_DBG_LEVEL_SEVERE, ("mem_free: illegal memory\n"));
+ /* protect mem stats from concurrent access */
+ SYS_ARCH_PROTECT(lev);
+ MEM_STATS_INC(illegal);
+ SYS_ARCH_UNPROTECT(lev);
+ return;
+ }
+ /* protect the heap from concurrent access */
+ LWIP_MEM_FREE_PROTECT();
+ /* Get the corresponding struct mem ... */
+ mem = (struct mem *)(void *)((u8_t *)rmem - SIZEOF_STRUCT_MEM);
+ /* ... which has to be in a used state ... */
+ LWIP_ASSERT("mem_free: mem->used", mem->used);
+ /* ... and is now unused. */
+ mem->used = 0;
+
+ if (mem < lfree) {
+ /* the newly freed struct is now the lowest */
+ lfree = mem;
+ }
+
+ MEM_STATS_DEC_USED(used, mem->next - (mem_size_t)(((u8_t *)mem - ram)));
+
+ /* finally, see if prev or next are free also */
+ plug_holes(mem);
+#if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT
+ mem_free_count = 1;
+#endif /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */
+ LWIP_MEM_FREE_UNPROTECT();
+}
+
+/**
+ * Shrink memory returned by mem_malloc().
+ *
+ * @param rmem pointer to memory allocated by mem_malloc the is to be shrinked
+ * @param newsize required size after shrinking (needs to be smaller than or
+ * equal to the previous size)
+ * @return for compatibility reasons: is always == rmem, at the moment
+ * or NULL if newsize is > old size, in which case rmem is NOT touched
+ * or freed!
+ */
+void *
+mem_trim(void *rmem, mem_size_t newsize)
+{
+ mem_size_t size;
+ mem_size_t ptr, ptr2;
+ struct mem *mem, *mem2;
+ /* use the FREE_PROTECT here: it protects with sem OR SYS_ARCH_PROTECT */
+ LWIP_MEM_FREE_DECL_PROTECT();
+
+ /* Expand the size of the allocated memory region so that we can
+ adjust for alignment. */
+ newsize = LWIP_MEM_ALIGN_SIZE(newsize);
+
+ if(newsize < MIN_SIZE_ALIGNED) {
+ /* every data block must be at least MIN_SIZE_ALIGNED long */
+ newsize = MIN_SIZE_ALIGNED;
+ }
+
+ if (newsize > MEM_SIZE_ALIGNED) {
+ return NULL;
+ }
+
+ LWIP_ASSERT("mem_trim: legal memory", (u8_t *)rmem >= (u8_t *)ram &&
+ (u8_t *)rmem < (u8_t *)ram_end);
+
+ if ((u8_t *)rmem < (u8_t *)ram || (u8_t *)rmem >= (u8_t *)ram_end) {
+ SYS_ARCH_DECL_PROTECT(lev);
+ LWIP_DEBUGF(MEM_DEBUG | LWIP_DBG_LEVEL_SEVERE, ("mem_trim: illegal memory\n"));
+ /* protect mem stats from concurrent access */
+ SYS_ARCH_PROTECT(lev);
+ MEM_STATS_INC(illegal);
+ SYS_ARCH_UNPROTECT(lev);
+ return rmem;
+ }
+ /* Get the corresponding struct mem ... */
+ mem = (struct mem *)(void *)((u8_t *)rmem - SIZEOF_STRUCT_MEM);
+ /* ... and its offset pointer */
+ ptr = (mem_size_t)((u8_t *)mem - ram);
+
+ size = mem->next - ptr - SIZEOF_STRUCT_MEM;
+ LWIP_ASSERT("mem_trim can only shrink memory", newsize <= size);
+ if (newsize > size) {
+ /* not supported */
+ return NULL;
+ }
+ if (newsize == size) {
+ /* No change in size, simply return */
+ return rmem;
+ }
+
+ /* protect the heap from concurrent access */
+ LWIP_MEM_FREE_PROTECT();
+
+ mem2 = (struct mem *)(void *)&ram[mem->next];
+ if(mem2->used == 0) {
+ /* The next struct is unused, we can simply move it at little */
+ mem_size_t next;
+ /* remember the old next pointer */
+ next = mem2->next;
+ /* create new struct mem which is moved directly after the shrinked mem */
+ ptr2 = ptr + SIZEOF_STRUCT_MEM + newsize;
+ if (lfree == mem2) {
+ lfree = (struct mem *)(void *)&ram[ptr2];
+ }
+ mem2 = (struct mem *)(void *)&ram[ptr2];
+ mem2->used = 0;
+ /* restore the next pointer */
+ mem2->next = next;
+ /* link it back to mem */
+ mem2->prev = ptr;
+ /* link mem to it */
+ mem->next = ptr2;
+ /* last thing to restore linked list: as we have moved mem2,
+ * let 'mem2->next->prev' point to mem2 again. but only if mem2->next is not
+ * the end of the heap */
+ if (mem2->next != MEM_SIZE_ALIGNED) {
+ ((struct mem *)(void *)&ram[mem2->next])->prev = ptr2;
+ }
+ MEM_STATS_DEC_USED(used, (size - newsize));
+ /* no need to plug holes, we've already done that */
+ } else if (newsize + SIZEOF_STRUCT_MEM + MIN_SIZE_ALIGNED <= size) {
+ /* Next struct is used but there's room for another struct mem with
+ * at least MIN_SIZE_ALIGNED of data.
+ * Old size ('size') must be big enough to contain at least 'newsize' plus a struct mem
+ * ('SIZEOF_STRUCT_MEM') with some data ('MIN_SIZE_ALIGNED').
+ * @todo we could leave out MIN_SIZE_ALIGNED. We would create an empty
+ * region that couldn't hold data, but when mem->next gets freed,
+ * the 2 regions would be combined, resulting in more free memory */
+ ptr2 = ptr + SIZEOF_STRUCT_MEM + newsize;
+ mem2 = (struct mem *)(void *)&ram[ptr2];
+ if (mem2 < lfree) {
+ lfree = mem2;
+ }
+ mem2->used = 0;
+ mem2->next = mem->next;
+ mem2->prev = ptr;
+ mem->next = ptr2;
+ if (mem2->next != MEM_SIZE_ALIGNED) {
+ ((struct mem *)(void *)&ram[mem2->next])->prev = ptr2;
+ }
+ MEM_STATS_DEC_USED(used, (size - newsize));
+ /* the original mem->next is used, so no need to plug holes! */
+ }
+ /* else {
+ next struct mem is used but size between mem and mem2 is not big enough
+ to create another struct mem
+ -> don't do anyhting.
+ -> the remaining space stays unused since it is too small
+ } */
+#if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT
+ mem_free_count = 1;
+#endif /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */
+ LWIP_MEM_FREE_UNPROTECT();
+ return rmem;
+}
+
+/**
+ * Adam's mem_malloc() plus solution for bug #17922
+ * Allocate a block of memory with a minimum of 'size' bytes.
+ *
+ * @param size is the minimum size of the requested block in bytes.
+ * @return pointer to allocated memory or NULL if no free memory was found.
+ *
+ * Note that the returned value will always be aligned (as defined by MEM_ALIGNMENT).
+ */
+void *
+mem_malloc(mem_size_t size)
+{
+ mem_size_t ptr, ptr2;
+ struct mem *mem, *mem2;
+#if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT
+ u8_t local_mem_free_count = 0;
+#endif /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */
+ LWIP_MEM_ALLOC_DECL_PROTECT();
+
+ if (size == 0) {
+ return NULL;
+ }
+
+ /* Expand the size of the allocated memory region so that we can
+ adjust for alignment. */
+ size = LWIP_MEM_ALIGN_SIZE(size);
+
+ if(size < MIN_SIZE_ALIGNED) {
+ /* every data block must be at least MIN_SIZE_ALIGNED long */
+ size = MIN_SIZE_ALIGNED;
+ }
+
+ if (size > MEM_SIZE_ALIGNED) {
+ return NULL;
+ }
+
+ /* protect the heap from concurrent access */
+ sys_mutex_lock(&mem_mutex);
+ LWIP_MEM_ALLOC_PROTECT();
+#if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT
+ /* run as long as a mem_free disturbed mem_malloc */
+ do {
+ local_mem_free_count = 0;
+#endif /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */
+
+ /* Scan through the heap searching for a free block that is big enough,
+ * beginning with the lowest free block.
+ */
+ for (ptr = (mem_size_t)((u8_t *)lfree - ram); ptr < MEM_SIZE_ALIGNED - size;
+ ptr = ((struct mem *)(void *)&ram[ptr])->next) {
+ mem = (struct mem *)(void *)&ram[ptr];
+#if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT
+ mem_free_count = 0;
+ LWIP_MEM_ALLOC_UNPROTECT();
+ /* allow mem_free to run */
+ LWIP_MEM_ALLOC_PROTECT();
+ if (mem_free_count != 0) {
+ local_mem_free_count = mem_free_count;
+ }
+ mem_free_count = 0;
+#endif /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */
+
+ if ((!mem->used) &&
+ (mem->next - (ptr + SIZEOF_STRUCT_MEM)) >= size) {
+ /* mem is not used and at least perfect fit is possible:
+ * mem->next - (ptr + SIZEOF_STRUCT_MEM) gives us the 'user data size' of mem */
+
+ if (mem->next - (ptr + SIZEOF_STRUCT_MEM) >= (size + SIZEOF_STRUCT_MEM + MIN_SIZE_ALIGNED)) {
+ /* (in addition to the above, we test if another struct mem (SIZEOF_STRUCT_MEM) containing
+ * at least MIN_SIZE_ALIGNED of data also fits in the 'user data space' of 'mem')
+ * -> split large block, create empty remainder,
+ * remainder must be large enough to contain MIN_SIZE_ALIGNED data: if
+ * mem->next - (ptr + (2*SIZEOF_STRUCT_MEM)) == size,
+ * struct mem would fit in but no data between mem2 and mem2->next
+ * @todo we could leave out MIN_SIZE_ALIGNED. We would create an empty
+ * region that couldn't hold data, but when mem->next gets freed,
+ * the 2 regions would be combined, resulting in more free memory
+ */
+ ptr2 = ptr + SIZEOF_STRUCT_MEM + size;
+ /* create mem2 struct */
+ mem2 = (struct mem *)(void *)&ram[ptr2];
+ mem2->used = 0;
+ mem2->next = mem->next;
+ mem2->prev = ptr;
+ /* and insert it between mem and mem->next */
+ mem->next = ptr2;
+ mem->used = 1;
+
+ if (mem2->next != MEM_SIZE_ALIGNED) {
+ ((struct mem *)(void *)&ram[mem2->next])->prev = ptr2;
+ }
+ MEM_STATS_INC_USED(used, (size + SIZEOF_STRUCT_MEM));
+ } else {
+ /* (a mem2 struct does no fit into the user data space of mem and mem->next will always
+ * be used at this point: if not we have 2 unused structs in a row, plug_holes should have
+ * take care of this).
+ * -> near fit or excact fit: do not split, no mem2 creation
+ * also can't move mem->next directly behind mem, since mem->next
+ * will always be used at this point!
+ */
+ mem->used = 1;
+ MEM_STATS_INC_USED(used, mem->next - (mem_size_t)((u8_t *)mem - ram));
+ }
+
+ if (mem == lfree) {
+ /* Find next free block after mem and update lowest free pointer */
+ while (lfree->used && lfree != ram_end) {
+ LWIP_MEM_ALLOC_UNPROTECT();
+ /* prevent high interrupt latency... */
+ LWIP_MEM_ALLOC_PROTECT();
+ lfree = (struct mem *)(void *)&ram[lfree->next];
+ }
+ LWIP_ASSERT("mem_malloc: !lfree->used", ((lfree == ram_end) || (!lfree->used)));
+ }
+ LWIP_MEM_ALLOC_UNPROTECT();
+ sys_mutex_unlock(&mem_mutex);
+ LWIP_ASSERT("mem_malloc: allocated memory not above ram_end.",
+ (mem_ptr_t)mem + SIZEOF_STRUCT_MEM + size <= (mem_ptr_t)ram_end);
+ LWIP_ASSERT("mem_malloc: allocated memory properly aligned.",
+ ((mem_ptr_t)mem + SIZEOF_STRUCT_MEM) % MEM_ALIGNMENT == 0);
+ LWIP_ASSERT("mem_malloc: sanity check alignment",
+ (((mem_ptr_t)mem) & (MEM_ALIGNMENT-1)) == 0);
+
+ return (u8_t *)mem + SIZEOF_STRUCT_MEM;
+ }
+ }
+#if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT
+ /* if we got interrupted by a mem_free, try again */
+ } while(local_mem_free_count != 0);
+#endif /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */
+ LWIP_DEBUGF(MEM_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("mem_malloc: could not allocate %"S16_F" bytes\n", (s16_t)size));
+ MEM_STATS_INC(err);
+ LWIP_MEM_ALLOC_UNPROTECT();
+ sys_mutex_unlock(&mem_mutex);
+ return NULL;
+}
+
+#endif /* MEM_USE_POOLS */
+/**
+ * Contiguously allocates enough space for count objects that are size bytes
+ * of memory each and returns a pointer to the allocated memory.
+ *
+ * The allocated memory is filled with bytes of value zero.
+ *
+ * @param count number of objects to allocate
+ * @param size size of the objects to allocate
+ * @return pointer to allocated memory / NULL pointer if there is an error
+ */
+void *mem_calloc(mem_size_t count, mem_size_t size)
+{
+ void *p;
+
+ /* allocate 'count' objects of size 'size' */
+ p = mem_malloc(count * size);
+ if (p) {
+ /* zero the memory */
+ memset(p, 0, count * size);
+ }
+ return p;
+}
+
+#endif /* !MEM_LIBC_MALLOC */
--- /dev/null
+/**
+ * @file
+ * Dynamic pool memory manager
+ *
+ * lwIP has dedicated pools for many structures (netconn, protocol control blocks,
+ * packet buffers, ...). All these pools are managed here.
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/memp.h"
+#include "lwip/pbuf.h"
+#include "lwip/udp.h"
+#include "lwip/raw.h"
+#include "lwip/tcp_impl.h"
+#include "lwip/igmp.h"
+#include "lwip/api.h"
+#include "lwip/api_msg.h"
+#include "lwip/tcpip.h"
+#include "lwip/sys.h"
+#include "lwip/timers.h"
+#include "lwip/stats.h"
+#include "netif/etharp.h"
+#include "lwip/ip_frag.h"
+#include "lwip/snmp_structs.h"
+#include "lwip/snmp_msg.h"
+#include "lwip/dns.h"
+#include "netif/ppp_oe.h"
+
+#include <string.h>
+
+#if !MEMP_MEM_MALLOC /* don't build if not configured for use in lwipopts.h */
+
+struct memp {
+ struct memp *next;
+#if MEMP_OVERFLOW_CHECK
+ const char *file;
+ int line;
+#endif /* MEMP_OVERFLOW_CHECK */
+};
+
+#if MEMP_OVERFLOW_CHECK
+/* if MEMP_OVERFLOW_CHECK is turned on, we reserve some bytes at the beginning
+ * and at the end of each element, initialize them as 0xcd and check
+ * them later. */
+/* If MEMP_OVERFLOW_CHECK is >= 2, on every call to memp_malloc or memp_free,
+ * every single element in each pool is checked!
+ * This is VERY SLOW but also very helpful. */
+/* MEMP_SANITY_REGION_BEFORE and MEMP_SANITY_REGION_AFTER can be overridden in
+ * lwipopts.h to change the amount reserved for checking. */
+#ifndef MEMP_SANITY_REGION_BEFORE
+#define MEMP_SANITY_REGION_BEFORE 16
+#endif /* MEMP_SANITY_REGION_BEFORE*/
+#if MEMP_SANITY_REGION_BEFORE > 0
+#define MEMP_SANITY_REGION_BEFORE_ALIGNED LWIP_MEM_ALIGN_SIZE(MEMP_SANITY_REGION_BEFORE)
+#else
+#define MEMP_SANITY_REGION_BEFORE_ALIGNED 0
+#endif /* MEMP_SANITY_REGION_BEFORE*/
+#ifndef MEMP_SANITY_REGION_AFTER
+#define MEMP_SANITY_REGION_AFTER 16
+#endif /* MEMP_SANITY_REGION_AFTER*/
+#if MEMP_SANITY_REGION_AFTER > 0
+#define MEMP_SANITY_REGION_AFTER_ALIGNED LWIP_MEM_ALIGN_SIZE(MEMP_SANITY_REGION_AFTER)
+#else
+#define MEMP_SANITY_REGION_AFTER_ALIGNED 0
+#endif /* MEMP_SANITY_REGION_AFTER*/
+
+/* MEMP_SIZE: save space for struct memp and for sanity check */
+#define MEMP_SIZE (LWIP_MEM_ALIGN_SIZE(sizeof(struct memp)) + MEMP_SANITY_REGION_BEFORE_ALIGNED)
+#define MEMP_ALIGN_SIZE(x) (LWIP_MEM_ALIGN_SIZE(x) + MEMP_SANITY_REGION_AFTER_ALIGNED)
+
+#else /* MEMP_OVERFLOW_CHECK */
+
+/* No sanity checks
+ * We don't need to preserve the struct memp while not allocated, so we
+ * can save a little space and set MEMP_SIZE to 0.
+ */
+#define MEMP_SIZE 0
+#define MEMP_ALIGN_SIZE(x) (LWIP_MEM_ALIGN_SIZE(x))
+
+#endif /* MEMP_OVERFLOW_CHECK */
+
+/** This array holds the first free element of each pool.
+ * Elements form a linked list. */
+static struct memp *memp_tab[MEMP_MAX];
+
+#else /* MEMP_MEM_MALLOC */
+
+#define MEMP_ALIGN_SIZE(x) (LWIP_MEM_ALIGN_SIZE(x))
+
+#endif /* MEMP_MEM_MALLOC */
+
+/** This array holds the element sizes of each pool. */
+#if !MEM_USE_POOLS && !MEMP_MEM_MALLOC
+static
+#endif
+const u16_t memp_sizes[MEMP_MAX] = {
+#define LWIP_MEMPOOL(name,num,size,desc) LWIP_MEM_ALIGN_SIZE(size),
+#include "lwip/memp_std.h"
+};
+
+#if !MEMP_MEM_MALLOC /* don't build if not configured for use in lwipopts.h */
+
+/** This array holds the number of elements in each pool. */
+static const u16_t memp_num[MEMP_MAX] = {
+#define LWIP_MEMPOOL(name,num,size,desc) (num),
+#include "lwip/memp_std.h"
+};
+
+/** This array holds a textual description of each pool. */
+#ifdef LWIP_DEBUG
+static const char *memp_desc[MEMP_MAX] = {
+#define LWIP_MEMPOOL(name,num,size,desc) (desc),
+#include "lwip/memp_std.h"
+};
+#endif /* LWIP_DEBUG */
+
+#if MEMP_SEPARATE_POOLS
+
+/** This creates each memory pool. These are named memp_memory_XXX_base (where
+ * XXX is the name of the pool defined in memp_std.h).
+ * To relocate a pool, declare it as extern in cc.h. Example for GCC:
+ * extern u8_t __attribute__((section(".onchip_mem"))) memp_memory_UDP_PCB_base[];
+ */
+#define LWIP_MEMPOOL(name,num,size,desc) u8_t memp_memory_ ## name ## _base \
+ [((num) * (MEMP_SIZE + MEMP_ALIGN_SIZE(size)))];
+#include "lwip/memp_std.h"
+
+/** This array holds the base of each memory pool. */
+static u8_t *const memp_bases[] = {
+#define LWIP_MEMPOOL(name,num,size,desc) memp_memory_ ## name ## _base,
+#include "lwip/memp_std.h"
+};
+
+#else /* MEMP_SEPARATE_POOLS */
+
+/** This is the actual memory used by the pools (all pools in one big block). */
+static u8_t memp_memory[MEM_ALIGNMENT - 1
+#define LWIP_MEMPOOL(name,num,size,desc) + ( (num) * (MEMP_SIZE + MEMP_ALIGN_SIZE(size) ) )
+#include "lwip/memp_std.h"
+];
+
+#endif /* MEMP_SEPARATE_POOLS */
+
+#if MEMP_SANITY_CHECK
+/**
+ * Check that memp-lists don't form a circle
+ */
+static int
+memp_sanity(void)
+{
+ s16_t i, c;
+ struct memp *m, *n;
+
+ for (i = 0; i < MEMP_MAX; i++) {
+ for (m = memp_tab[i]; m != NULL; m = m->next) {
+ c = 1;
+ for (n = memp_tab[i]; n != NULL; n = n->next) {
+ if (n == m && --c < 0) {
+ return 0;
+ }
+ }
+ }
+ }
+ return 1;
+}
+#endif /* MEMP_SANITY_CHECK*/
+#if MEMP_OVERFLOW_CHECK
+#if defined(LWIP_DEBUG) && MEMP_STATS
+static const char * memp_overflow_names[] = {
+#define LWIP_MEMPOOL(name,num,size,desc) "/"desc,
+#include "lwip/memp_std.h"
+ };
+#endif
+
+/**
+ * Check if a memp element was victim of an overflow
+ * (e.g. the restricted area after it has been altered)
+ *
+ * @param p the memp element to check
+ * @param memp_type the pool p comes from
+ */
+static void
+memp_overflow_check_element_overflow(struct memp *p, u16_t memp_type)
+{
+ u16_t k;
+ u8_t *m;
+#if MEMP_SANITY_REGION_AFTER_ALIGNED > 0
+ m = (u8_t*)p + MEMP_SIZE + memp_sizes[memp_type];
+ for (k = 0; k < MEMP_SANITY_REGION_AFTER_ALIGNED; k++) {
+ if (m[k] != 0xcd) {
+ char errstr[128] = "detected memp overflow in pool ";
+ char digit[] = "0";
+ if(memp_type >= 10) {
+ digit[0] = '0' + (memp_type/10);
+ strcat(errstr, digit);
+ }
+ digit[0] = '0' + (memp_type%10);
+ strcat(errstr, digit);
+#if defined(LWIP_DEBUG) && MEMP_STATS
+ strcat(errstr, memp_overflow_names[memp_type]);
+#endif
+ LWIP_ASSERT(errstr, 0);
+ }
+ }
+#endif
+}
+
+/**
+ * Check if a memp element was victim of an underflow
+ * (e.g. the restricted area before it has been altered)
+ *
+ * @param p the memp element to check
+ * @param memp_type the pool p comes from
+ */
+static void
+memp_overflow_check_element_underflow(struct memp *p, u16_t memp_type)
+{
+ u16_t k;
+ u8_t *m;
+#if MEMP_SANITY_REGION_BEFORE_ALIGNED > 0
+ m = (u8_t*)p + MEMP_SIZE - MEMP_SANITY_REGION_BEFORE_ALIGNED;
+ for (k = 0; k < MEMP_SANITY_REGION_BEFORE_ALIGNED; k++) {
+ if (m[k] != 0xcd) {
+ char errstr[128] = "detected memp underflow in pool ";
+ char digit[] = "0";
+ if(memp_type >= 10) {
+ digit[0] = '0' + (memp_type/10);
+ strcat(errstr, digit);
+ }
+ digit[0] = '0' + (memp_type%10);
+ strcat(errstr, digit);
+#if defined(LWIP_DEBUG) && MEMP_STATS
+ strcat(errstr, memp_overflow_names[memp_type]);
+#endif
+ LWIP_ASSERT(errstr, 0);
+ }
+ }
+#endif
+}
+
+/**
+ * Do an overflow check for all elements in every pool.
+ *
+ * @see memp_overflow_check_element for a description of the check
+ */
+static void
+memp_overflow_check_all(void)
+{
+ u16_t i, j;
+ struct memp *p;
+
+ p = (struct memp *)LWIP_MEM_ALIGN(memp_memory);
+ for (i = 0; i < MEMP_MAX; ++i) {
+ p = p;
+ for (j = 0; j < memp_num[i]; ++j) {
+ memp_overflow_check_element_overflow(p, i);
+ p = (struct memp*)((u8_t*)p + MEMP_SIZE + memp_sizes[i] + MEMP_SANITY_REGION_AFTER_ALIGNED);
+ }
+ }
+ p = (struct memp *)LWIP_MEM_ALIGN(memp_memory);
+ for (i = 0; i < MEMP_MAX; ++i) {
+ p = p;
+ for (j = 0; j < memp_num[i]; ++j) {
+ memp_overflow_check_element_underflow(p, i);
+ p = (struct memp*)((u8_t*)p + MEMP_SIZE + memp_sizes[i] + MEMP_SANITY_REGION_AFTER_ALIGNED);
+ }
+ }
+}
+
+/**
+ * Initialize the restricted areas of all memp elements in every pool.
+ */
+static void
+memp_overflow_init(void)
+{
+ u16_t i, j;
+ struct memp *p;
+ u8_t *m;
+
+ p = (struct memp *)LWIP_MEM_ALIGN(memp_memory);
+ for (i = 0; i < MEMP_MAX; ++i) {
+ p = p;
+ for (j = 0; j < memp_num[i]; ++j) {
+#if MEMP_SANITY_REGION_BEFORE_ALIGNED > 0
+ m = (u8_t*)p + MEMP_SIZE - MEMP_SANITY_REGION_BEFORE_ALIGNED;
+ memset(m, 0xcd, MEMP_SANITY_REGION_BEFORE_ALIGNED);
+#endif
+#if MEMP_SANITY_REGION_AFTER_ALIGNED > 0
+ m = (u8_t*)p + MEMP_SIZE + memp_sizes[i];
+ memset(m, 0xcd, MEMP_SANITY_REGION_AFTER_ALIGNED);
+#endif
+ p = (struct memp*)((u8_t*)p + MEMP_SIZE + memp_sizes[i] + MEMP_SANITY_REGION_AFTER_ALIGNED);
+ }
+ }
+}
+#endif /* MEMP_OVERFLOW_CHECK */
+
+/**
+ * Initialize this module.
+ *
+ * Carves out memp_memory into linked lists for each pool-type.
+ */
+void
+memp_init(void)
+{
+ struct memp *memp;
+ u16_t i, j;
+
+ for (i = 0; i < MEMP_MAX; ++i) {
+ MEMP_STATS_AVAIL(used, i, 0);
+ MEMP_STATS_AVAIL(max, i, 0);
+ MEMP_STATS_AVAIL(err, i, 0);
+ MEMP_STATS_AVAIL(avail, i, memp_num[i]);
+ }
+
+#if !MEMP_SEPARATE_POOLS
+ memp = (struct memp *)LWIP_MEM_ALIGN(memp_memory);
+#endif /* !MEMP_SEPARATE_POOLS */
+ /* for every pool: */
+ for (i = 0; i < MEMP_MAX; ++i) {
+ memp_tab[i] = NULL;
+#if MEMP_SEPARATE_POOLS
+ memp = (struct memp*)memp_bases[i];
+#endif /* MEMP_SEPARATE_POOLS */
+ /* create a linked list of memp elements */
+ for (j = 0; j < memp_num[i]; ++j) {
+ memp->next = memp_tab[i];
+ memp_tab[i] = memp;
+ memp = (struct memp *)(void *)((u8_t *)memp + MEMP_SIZE + memp_sizes[i]
+#if MEMP_OVERFLOW_CHECK
+ + MEMP_SANITY_REGION_AFTER_ALIGNED
+#endif
+ );
+ }
+ }
+#if MEMP_OVERFLOW_CHECK
+ memp_overflow_init();
+ /* check everything a first time to see if it worked */
+ memp_overflow_check_all();
+#endif /* MEMP_OVERFLOW_CHECK */
+}
+
+/**
+ * Get an element from a specific pool.
+ *
+ * @param type the pool to get an element from
+ *
+ * the debug version has two more parameters:
+ * @param file file name calling this function
+ * @param line number of line where this function is called
+ *
+ * @return a pointer to the allocated memory or a NULL pointer on error
+ */
+void *
+#if !MEMP_OVERFLOW_CHECK
+memp_malloc(memp_t type)
+#else
+memp_malloc_fn(memp_t type, const char* file, const int line)
+#endif
+{
+ struct memp *memp;
+ SYS_ARCH_DECL_PROTECT(old_level);
+
+ LWIP_ERROR("memp_malloc: type < MEMP_MAX", (type < MEMP_MAX), return NULL;);
+
+ SYS_ARCH_PROTECT(old_level);
+#if MEMP_OVERFLOW_CHECK >= 2
+ memp_overflow_check_all();
+#endif /* MEMP_OVERFLOW_CHECK >= 2 */
+
+ memp = memp_tab[type];
+
+ if (memp != NULL) {
+ memp_tab[type] = memp->next;
+#if MEMP_OVERFLOW_CHECK
+ memp->next = NULL;
+ memp->file = file;
+ memp->line = line;
+#endif /* MEMP_OVERFLOW_CHECK */
+ MEMP_STATS_INC_USED(used, type);
+ LWIP_ASSERT("memp_malloc: memp properly aligned",
+ ((mem_ptr_t)memp % MEM_ALIGNMENT) == 0);
+ memp = (struct memp*)(void *)((u8_t*)memp + MEMP_SIZE);
+ } else {
+ LWIP_DEBUGF(MEMP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("memp_malloc: out of memory in pool %s\n", memp_desc[type]));
+ MEMP_STATS_INC(err, type);
+ }
+
+ SYS_ARCH_UNPROTECT(old_level);
+
+ return memp;
+}
+
+/**
+ * Put an element back into its pool.
+ *
+ * @param type the pool where to put mem
+ * @param mem the memp element to free
+ */
+void
+memp_free(memp_t type, void *mem)
+{
+ struct memp *memp;
+ SYS_ARCH_DECL_PROTECT(old_level);
+
+ if (mem == NULL) {
+ return;
+ }
+ LWIP_ASSERT("memp_free: mem properly aligned",
+ ((mem_ptr_t)mem % MEM_ALIGNMENT) == 0);
+
+ memp = (struct memp *)(void *)((u8_t*)mem - MEMP_SIZE);
+
+ SYS_ARCH_PROTECT(old_level);
+#if MEMP_OVERFLOW_CHECK
+#if MEMP_OVERFLOW_CHECK >= 2
+ memp_overflow_check_all();
+#else
+ memp_overflow_check_element_overflow(memp, type);
+ memp_overflow_check_element_underflow(memp, type);
+#endif /* MEMP_OVERFLOW_CHECK >= 2 */
+#endif /* MEMP_OVERFLOW_CHECK */
+
+ MEMP_STATS_DEC(used, type);
+
+ memp->next = memp_tab[type];
+ memp_tab[type] = memp;
+
+#if MEMP_SANITY_CHECK
+ LWIP_ASSERT("memp sanity", memp_sanity());
+#endif /* MEMP_SANITY_CHECK */
+
+ SYS_ARCH_UNPROTECT(old_level);
+}
+
+#endif /* MEMP_MEM_MALLOC */
--- /dev/null
+/**
+ * @file
+ * lwIP network interface abstraction
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/def.h"
+#include "lwip/ip_addr.h"
+#include "lwip/netif.h"
+#include "lwip/tcp_impl.h"
+#include "lwip/snmp.h"
+#include "lwip/igmp.h"
+#include "netif/etharp.h"
+#include "lwip/stats.h"
+#if ENABLE_LOOPBACK
+#include "lwip/sys.h"
+#if LWIP_NETIF_LOOPBACK_MULTITHREADING
+#include "lwip/tcpip.h"
+#endif /* LWIP_NETIF_LOOPBACK_MULTITHREADING */
+#endif /* ENABLE_LOOPBACK */
+
+#if LWIP_AUTOIP
+#include "lwip/autoip.h"
+#endif /* LWIP_AUTOIP */
+#if LWIP_DHCP
+#include "lwip/dhcp.h"
+#endif /* LWIP_DHCP */
+
+#if LWIP_NETIF_STATUS_CALLBACK
+#define NETIF_STATUS_CALLBACK(n) do{ if (n->status_callback) { (n->status_callback)(n); }}while(0)
+#else
+#define NETIF_STATUS_CALLBACK(n)
+#endif /* LWIP_NETIF_STATUS_CALLBACK */
+
+#if LWIP_NETIF_LINK_CALLBACK
+#define NETIF_LINK_CALLBACK(n) do{ if (n->link_callback) { (n->link_callback)(n); }}while(0)
+#else
+#define NETIF_LINK_CALLBACK(n)
+#endif /* LWIP_NETIF_LINK_CALLBACK */
+
+struct netif *netif_list;
+struct netif *netif_default;
+
+#if LWIP_HAVE_LOOPIF
+static struct netif loop_netif;
+
+/**
+ * Initialize a lwip network interface structure for a loopback interface
+ *
+ * @param netif the lwip network interface structure for this loopif
+ * @return ERR_OK if the loopif is initialized
+ * ERR_MEM if private data couldn't be allocated
+ */
+static err_t
+netif_loopif_init(struct netif *netif)
+{
+ /* initialize the snmp variables and counters inside the struct netif
+ * ifSpeed: no assumption can be made!
+ */
+ NETIF_INIT_SNMP(netif, snmp_ifType_softwareLoopback, 0);
+
+ netif->name[0] = 'l';
+ netif->name[1] = 'o';
+ netif->output = netif_loop_output;
+ return ERR_OK;
+}
+#endif /* LWIP_HAVE_LOOPIF */
+
+void
+netif_init(void)
+{
+#if LWIP_HAVE_LOOPIF
+ ip_addr_t loop_ipaddr, loop_netmask, loop_gw;
+ IP4_ADDR(&loop_gw, 127,0,0,1);
+ IP4_ADDR(&loop_ipaddr, 127,0,0,1);
+ IP4_ADDR(&loop_netmask, 255,0,0,0);
+
+#if NO_SYS
+ netif_add(&loop_netif, &loop_ipaddr, &loop_netmask, &loop_gw, NULL, netif_loopif_init, ip_input);
+#else /* NO_SYS */
+ netif_add(&loop_netif, &loop_ipaddr, &loop_netmask, &loop_gw, NULL, netif_loopif_init, tcpip_input);
+#endif /* NO_SYS */
+ netif_set_up(&loop_netif);
+
+#endif /* LWIP_HAVE_LOOPIF */
+}
+
+/**
+ * Add a network interface to the list of lwIP netifs.
+ *
+ * @param netif a pre-allocated netif structure
+ * @param ipaddr IP address for the new netif
+ * @param netmask network mask for the new netif
+ * @param gw default gateway IP address for the new netif
+ * @param state opaque data passed to the new netif
+ * @param init callback function that initializes the interface
+ * @param input callback function that is called to pass
+ * ingress packets up in the protocol layer stack.
+ *
+ * @return netif, or NULL if failed.
+ */
+struct netif *
+netif_add(struct netif *netif, ip_addr_t *ipaddr, ip_addr_t *netmask,
+ ip_addr_t *gw, void *state, netif_init_fn init, netif_input_fn input)
+{
+ static u8_t netifnum = 0;
+
+ LWIP_ASSERT("No init function given", init != NULL);
+
+ /* reset new interface configuration state */
+ ip_addr_set_zero(&netif->ip_addr);
+ ip_addr_set_zero(&netif->netmask);
+ ip_addr_set_zero(&netif->gw);
+ netif->flags = 0;
+#if LWIP_DHCP
+ /* netif not under DHCP control by default */
+ netif->dhcp = NULL;
+#endif /* LWIP_DHCP */
+#if LWIP_AUTOIP
+ /* netif not under AutoIP control by default */
+ netif->autoip = NULL;
+#endif /* LWIP_AUTOIP */
+#if LWIP_NETIF_STATUS_CALLBACK
+ netif->status_callback = NULL;
+#endif /* LWIP_NETIF_STATUS_CALLBACK */
+#if LWIP_NETIF_LINK_CALLBACK
+ netif->link_callback = NULL;
+#endif /* LWIP_NETIF_LINK_CALLBACK */
+#if LWIP_IGMP
+ netif->igmp_mac_filter = NULL;
+#endif /* LWIP_IGMP */
+#if ENABLE_LOOPBACK
+ netif->loop_first = NULL;
+ netif->loop_last = NULL;
+#endif /* ENABLE_LOOPBACK */
+
+ /* remember netif specific state information data */
+ netif->state = state;
+ netif->num = netifnum++;
+ netif->input = input;
+#if LWIP_NETIF_HWADDRHINT
+ netif->addr_hint = NULL;
+#endif /* LWIP_NETIF_HWADDRHINT*/
+#if ENABLE_LOOPBACK && LWIP_LOOPBACK_MAX_PBUFS
+ netif->loop_cnt_current = 0;
+#endif /* ENABLE_LOOPBACK && LWIP_LOOPBACK_MAX_PBUFS */
+
+ netif_set_addr(netif, ipaddr, netmask, gw);
+
+ /* call user specified initialization function for netif */
+ if (init(netif) != ERR_OK) {
+ return NULL;
+ }
+
+ /* add this netif to the list */
+ netif->next = netif_list;
+ netif_list = netif;
+ snmp_inc_iflist();
+
+#if LWIP_IGMP
+ /* start IGMP processing */
+ if (netif->flags & NETIF_FLAG_IGMP) {
+ igmp_start(netif);
+ }
+#endif /* LWIP_IGMP */
+
+ LWIP_DEBUGF(NETIF_DEBUG, ("netif: added interface %c%c IP addr ",
+ netif->name[0], netif->name[1]));
+ ip_addr_debug_print(NETIF_DEBUG, ipaddr);
+ LWIP_DEBUGF(NETIF_DEBUG, (" netmask "));
+ ip_addr_debug_print(NETIF_DEBUG, netmask);
+ LWIP_DEBUGF(NETIF_DEBUG, (" gw "));
+ ip_addr_debug_print(NETIF_DEBUG, gw);
+ LWIP_DEBUGF(NETIF_DEBUG, ("\n"));
+ return netif;
+}
+
+/**
+ * Change IP address configuration for a network interface (including netmask
+ * and default gateway).
+ *
+ * @param netif the network interface to change
+ * @param ipaddr the new IP address
+ * @param netmask the new netmask
+ * @param gw the new default gateway
+ */
+void
+netif_set_addr(struct netif *netif, ip_addr_t *ipaddr, ip_addr_t *netmask,
+ ip_addr_t *gw)
+{
+ netif_set_ipaddr(netif, ipaddr);
+ netif_set_netmask(netif, netmask);
+ netif_set_gw(netif, gw);
+}
+
+/**
+ * Remove a network interface from the list of lwIP netifs.
+ *
+ * @param netif the network interface to remove
+ */
+void
+netif_remove(struct netif *netif)
+{
+ if (netif == NULL) {
+ return;
+ }
+
+#if LWIP_IGMP
+ /* stop IGMP processing */
+ if (netif->flags & NETIF_FLAG_IGMP) {
+ igmp_stop(netif);
+ }
+#endif /* LWIP_IGMP */
+ if (netif_is_up(netif)) {
+ /* set netif down before removing (call callback function) */
+ netif_set_down(netif);
+ }
+
+ snmp_delete_ipaddridx_tree(netif);
+
+ /* is it the first netif? */
+ if (netif_list == netif) {
+ netif_list = netif->next;
+ } else {
+ /* look for netif further down the list */
+ struct netif * tmpNetif;
+ for (tmpNetif = netif_list; tmpNetif != NULL; tmpNetif = tmpNetif->next) {
+ if (tmpNetif->next == netif) {
+ tmpNetif->next = netif->next;
+ break;
+ }
+ }
+ if (tmpNetif == NULL)
+ return; /* we didn't find any netif today */
+ }
+ snmp_dec_iflist();
+ /* this netif is default? */
+ if (netif_default == netif) {
+ /* reset default netif */
+ netif_set_default(NULL);
+ }
+ LWIP_DEBUGF( NETIF_DEBUG, ("netif_remove: removed netif\n") );
+}
+
+/**
+ * Find a network interface by searching for its name
+ *
+ * @param name the name of the netif (like netif->name) plus concatenated number
+ * in ascii representation (e.g. 'en0')
+ */
+struct netif *
+netif_find(char *name)
+{
+ struct netif *netif;
+ u8_t num;
+
+ if (name == NULL) {
+ return NULL;
+ }
+
+ num = name[2] - '0';
+
+ for(netif = netif_list; netif != NULL; netif = netif->next) {
+ if (num == netif->num &&
+ name[0] == netif->name[0] &&
+ name[1] == netif->name[1]) {
+ LWIP_DEBUGF(NETIF_DEBUG, ("netif_find: found %c%c\n", name[0], name[1]));
+ return netif;
+ }
+ }
+ LWIP_DEBUGF(NETIF_DEBUG, ("netif_find: didn't find %c%c\n", name[0], name[1]));
+ return NULL;
+}
+
+/**
+ * Change the IP address of a network interface
+ *
+ * @param netif the network interface to change
+ * @param ipaddr the new IP address
+ *
+ * @note call netif_set_addr() if you also want to change netmask and
+ * default gateway
+ */
+void
+netif_set_ipaddr(struct netif *netif, ip_addr_t *ipaddr)
+{
+ /* TODO: Handling of obsolete pcbs */
+ /* See: http://mail.gnu.org/archive/html/lwip-users/2003-03/msg00118.html */
+#if LWIP_TCP
+ struct tcp_pcb *pcb;
+ struct tcp_pcb_listen *lpcb;
+
+ /* address is actually being changed? */
+ if ((ip_addr_cmp(ipaddr, &(netif->ip_addr))) == 0) {
+ /* extern struct tcp_pcb *tcp_active_pcbs; defined by tcp.h */
+ LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_STATE, ("netif_set_ipaddr: netif address being changed\n"));
+ pcb = tcp_active_pcbs;
+ while (pcb != NULL) {
+ /* PCB bound to current local interface address? */
+ if (ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))
+#if LWIP_AUTOIP
+ /* connections to link-local addresses must persist (RFC3927 ch. 1.9) */
+ && !ip_addr_islinklocal(&(pcb->local_ip))
+#endif /* LWIP_AUTOIP */
+ ) {
+ /* this connection must be aborted */
+ struct tcp_pcb *next = pcb->next;
+ LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_STATE, ("netif_set_ipaddr: aborting TCP pcb %p\n", (void *)pcb));
+ tcp_abort(pcb);
+ pcb = next;
+ } else {
+ pcb = pcb->next;
+ }
+ }
+ for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
+ /* PCB bound to current local interface address? */
+ if ((!(ip_addr_isany(&(lpcb->local_ip)))) &&
+ (ip_addr_cmp(&(lpcb->local_ip), &(netif->ip_addr)))) {
+ /* The PCB is listening to the old ipaddr and
+ * is set to listen to the new one instead */
+ ip_addr_set(&(lpcb->local_ip), ipaddr);
+ }
+ }
+ }
+#endif
+ snmp_delete_ipaddridx_tree(netif);
+ snmp_delete_iprteidx_tree(0,netif);
+ /* set new IP address to netif */
+ ip_addr_set(&(netif->ip_addr), ipaddr);
+ snmp_insert_ipaddridx_tree(netif);
+ snmp_insert_iprteidx_tree(0,netif);
+
+ LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("netif: IP address of interface %c%c set to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ netif->name[0], netif->name[1],
+ ip4_addr1_16(&netif->ip_addr),
+ ip4_addr2_16(&netif->ip_addr),
+ ip4_addr3_16(&netif->ip_addr),
+ ip4_addr4_16(&netif->ip_addr)));
+}
+
+/**
+ * Change the default gateway for a network interface
+ *
+ * @param netif the network interface to change
+ * @param gw the new default gateway
+ *
+ * @note call netif_set_addr() if you also want to change ip address and netmask
+ */
+void
+netif_set_gw(struct netif *netif, ip_addr_t *gw)
+{
+ ip_addr_set(&(netif->gw), gw);
+ LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("netif: GW address of interface %c%c set to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ netif->name[0], netif->name[1],
+ ip4_addr1_16(&netif->gw),
+ ip4_addr2_16(&netif->gw),
+ ip4_addr3_16(&netif->gw),
+ ip4_addr4_16(&netif->gw)));
+}
+
+/**
+ * Change the netmask of a network interface
+ *
+ * @param netif the network interface to change
+ * @param netmask the new netmask
+ *
+ * @note call netif_set_addr() if you also want to change ip address and
+ * default gateway
+ */
+void
+netif_set_netmask(struct netif *netif, ip_addr_t *netmask)
+{
+ snmp_delete_iprteidx_tree(0, netif);
+ /* set new netmask to netif */
+ ip_addr_set(&(netif->netmask), netmask);
+ snmp_insert_iprteidx_tree(0, netif);
+ LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("netif: netmask of interface %c%c set to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ netif->name[0], netif->name[1],
+ ip4_addr1_16(&netif->netmask),
+ ip4_addr2_16(&netif->netmask),
+ ip4_addr3_16(&netif->netmask),
+ ip4_addr4_16(&netif->netmask)));
+}
+
+/**
+ * Set a network interface as the default network interface
+ * (used to output all packets for which no specific route is found)
+ *
+ * @param netif the default network interface
+ */
+void
+netif_set_default(struct netif *netif)
+{
+ if (netif == NULL) {
+ /* remove default route */
+ snmp_delete_iprteidx_tree(1, netif);
+ } else {
+ /* install default route */
+ snmp_insert_iprteidx_tree(1, netif);
+ }
+ netif_default = netif;
+ LWIP_DEBUGF(NETIF_DEBUG, ("netif: setting default interface %c%c\n",
+ netif ? netif->name[0] : '\'', netif ? netif->name[1] : '\''));
+}
+
+/**
+ * Bring an interface up, available for processing
+ * traffic.
+ *
+ * @note: Enabling DHCP on a down interface will make it come
+ * up once configured.
+ *
+ * @see dhcp_start()
+ */
+void netif_set_up(struct netif *netif)
+{
+ if (!(netif->flags & NETIF_FLAG_UP)) {
+ netif->flags |= NETIF_FLAG_UP;
+
+#if LWIP_SNMP
+ snmp_get_sysuptime(&netif->ts);
+#endif /* LWIP_SNMP */
+
+ NETIF_STATUS_CALLBACK(netif);
+
+ if (netif->flags & NETIF_FLAG_LINK_UP) {
+#if LWIP_ARP
+ /* For Ethernet network interfaces, we would like to send a "gratuitous ARP" */
+ if (netif->flags & (NETIF_FLAG_ETHARP)) {
+ etharp_gratuitous(netif);
+ }
+#endif /* LWIP_ARP */
+
+#if LWIP_IGMP
+ /* resend IGMP memberships */
+ if (netif->flags & NETIF_FLAG_IGMP) {
+ igmp_report_groups( netif);
+ }
+#endif /* LWIP_IGMP */
+ }
+ }
+}
+
+/**
+ * Bring an interface down, disabling any traffic processing.
+ *
+ * @note: Enabling DHCP on a down interface will make it come
+ * up once configured.
+ *
+ * @see dhcp_start()
+ */
+void netif_set_down(struct netif *netif)
+{
+ if (netif->flags & NETIF_FLAG_UP) {
+ netif->flags &= ~NETIF_FLAG_UP;
+#if LWIP_SNMP
+ snmp_get_sysuptime(&netif->ts);
+#endif
+
+ NETIF_STATUS_CALLBACK(netif);
+ }
+}
+
+#if LWIP_NETIF_STATUS_CALLBACK
+/**
+ * Set callback to be called when interface is brought up/down
+ */
+void netif_set_status_callback(struct netif *netif, netif_status_callback_fn status_callback)
+{
+ if (netif) {
+ netif->status_callback = status_callback;
+ }
+}
+#endif /* LWIP_NETIF_STATUS_CALLBACK */
+
+/**
+ * Called by a driver when its link goes up
+ */
+void netif_set_link_up(struct netif *netif )
+{
+ if (!(netif->flags & NETIF_FLAG_LINK_UP)) {
+ netif->flags |= NETIF_FLAG_LINK_UP;
+
+#if LWIP_DHCP
+ if (netif->dhcp) {
+ dhcp_network_changed(netif);
+ }
+#endif /* LWIP_DHCP */
+
+#if LWIP_AUTOIP
+ if (netif->autoip) {
+ autoip_network_changed(netif);
+ }
+#endif /* LWIP_AUTOIP */
+
+ if (netif->flags & NETIF_FLAG_UP) {
+#if LWIP_ARP
+ /* For Ethernet network interfaces, we would like to send a "gratuitous ARP" */
+ if (netif->flags & NETIF_FLAG_ETHARP) {
+ etharp_gratuitous(netif);
+ }
+#endif /* LWIP_ARP */
+
+#if LWIP_IGMP
+ /* resend IGMP memberships */
+ if (netif->flags & NETIF_FLAG_IGMP) {
+ igmp_report_groups( netif);
+ }
+#endif /* LWIP_IGMP */
+ }
+ NETIF_LINK_CALLBACK(netif);
+ }
+}
+
+/**
+ * Called by a driver when its link goes down
+ */
+void netif_set_link_down(struct netif *netif )
+{
+ if (netif->flags & NETIF_FLAG_LINK_UP) {
+ netif->flags &= ~NETIF_FLAG_LINK_UP;
+ NETIF_LINK_CALLBACK(netif);
+ }
+}
+
+#if LWIP_NETIF_LINK_CALLBACK
+/**
+ * Set callback to be called when link is brought up/down
+ */
+void netif_set_link_callback(struct netif *netif, netif_status_callback_fn link_callback)
+{
+ if (netif) {
+ netif->link_callback = link_callback;
+ }
+}
+#endif /* LWIP_NETIF_LINK_CALLBACK */
+
+#if ENABLE_LOOPBACK
+/**
+ * Send an IP packet to be received on the same netif (loopif-like).
+ * The pbuf is simply copied and handed back to netif->input.
+ * In multithreaded mode, this is done directly since netif->input must put
+ * the packet on a queue.
+ * In callback mode, the packet is put on an internal queue and is fed to
+ * netif->input by netif_poll().
+ *
+ * @param netif the lwip network interface structure
+ * @param p the (IP) packet to 'send'
+ * @param ipaddr the ip address to send the packet to (not used)
+ * @return ERR_OK if the packet has been sent
+ * ERR_MEM if the pbuf used to copy the packet couldn't be allocated
+ */
+err_t
+netif_loop_output(struct netif *netif, struct pbuf *p,
+ ip_addr_t *ipaddr)
+{
+ struct pbuf *r;
+ err_t err;
+ struct pbuf *last;
+#if LWIP_LOOPBACK_MAX_PBUFS
+ u8_t clen = 0;
+#endif /* LWIP_LOOPBACK_MAX_PBUFS */
+ /* If we have a loopif, SNMP counters are adjusted for it,
+ * if not they are adjusted for 'netif'. */
+#if LWIP_SNMP
+#if LWIP_HAVE_LOOPIF
+ struct netif *stats_if = &loop_netif;
+#else /* LWIP_HAVE_LOOPIF */
+ struct netif *stats_if = netif;
+#endif /* LWIP_HAVE_LOOPIF */
+#endif /* LWIP_SNMP */
+ SYS_ARCH_DECL_PROTECT(lev);
+ LWIP_UNUSED_ARG(ipaddr);
+
+ /* Allocate a new pbuf */
+ r = pbuf_alloc(PBUF_LINK, p->tot_len, PBUF_RAM);
+ if (r == NULL) {
+ LINK_STATS_INC(link.memerr);
+ LINK_STATS_INC(link.drop);
+ snmp_inc_ifoutdiscards(stats_if);
+ return ERR_MEM;
+ }
+#if LWIP_LOOPBACK_MAX_PBUFS
+ clen = pbuf_clen(r);
+ /* check for overflow or too many pbuf on queue */
+ if(((netif->loop_cnt_current + clen) < netif->loop_cnt_current) ||
+ ((netif->loop_cnt_current + clen) > LWIP_LOOPBACK_MAX_PBUFS)) {
+ pbuf_free(r);
+ LINK_STATS_INC(link.memerr);
+ LINK_STATS_INC(link.drop);
+ snmp_inc_ifoutdiscards(stats_if);
+ return ERR_MEM;
+ }
+ netif->loop_cnt_current += clen;
+#endif /* LWIP_LOOPBACK_MAX_PBUFS */
+
+ /* Copy the whole pbuf queue p into the single pbuf r */
+ if ((err = pbuf_copy(r, p)) != ERR_OK) {
+ pbuf_free(r);
+ LINK_STATS_INC(link.memerr);
+ LINK_STATS_INC(link.drop);
+ snmp_inc_ifoutdiscards(stats_if);
+ return err;
+ }
+
+ /* Put the packet on a linked list which gets emptied through calling
+ netif_poll(). */
+
+ /* let last point to the last pbuf in chain r */
+ for (last = r; last->next != NULL; last = last->next);
+
+ SYS_ARCH_PROTECT(lev);
+ if(netif->loop_first != NULL) {
+ LWIP_ASSERT("if first != NULL, last must also be != NULL", netif->loop_last != NULL);
+ netif->loop_last->next = r;
+ netif->loop_last = last;
+ } else {
+ netif->loop_first = r;
+ netif->loop_last = last;
+ }
+ SYS_ARCH_UNPROTECT(lev);
+
+ LINK_STATS_INC(link.xmit);
+ snmp_add_ifoutoctets(stats_if, p->tot_len);
+ snmp_inc_ifoutucastpkts(stats_if);
+
+#if LWIP_NETIF_LOOPBACK_MULTITHREADING
+ /* For multithreading environment, schedule a call to netif_poll */
+ tcpip_callback((tcpip_callback_fn)netif_poll, netif);
+#endif /* LWIP_NETIF_LOOPBACK_MULTITHREADING */
+
+ return ERR_OK;
+}
+
+/**
+ * Call netif_poll() in the main loop of your application. This is to prevent
+ * reentering non-reentrant functions like tcp_input(). Packets passed to
+ * netif_loop_output() are put on a list that is passed to netif->input() by
+ * netif_poll().
+ */
+void
+netif_poll(struct netif *netif)
+{
+ struct pbuf *in;
+ /* If we have a loopif, SNMP counters are adjusted for it,
+ * if not they are adjusted for 'netif'. */
+#if LWIP_SNMP
+#if LWIP_HAVE_LOOPIF
+ struct netif *stats_if = &loop_netif;
+#else /* LWIP_HAVE_LOOPIF */
+ struct netif *stats_if = netif;
+#endif /* LWIP_HAVE_LOOPIF */
+#endif /* LWIP_SNMP */
+ SYS_ARCH_DECL_PROTECT(lev);
+
+ do {
+ /* Get a packet from the list. With SYS_LIGHTWEIGHT_PROT=1, this is protected */
+ SYS_ARCH_PROTECT(lev);
+ in = netif->loop_first;
+ if (in != NULL) {
+ struct pbuf *in_end = in;
+#if LWIP_LOOPBACK_MAX_PBUFS
+ u8_t clen = pbuf_clen(in);
+ /* adjust the number of pbufs on queue */
+ LWIP_ASSERT("netif->loop_cnt_current underflow",
+ ((netif->loop_cnt_current - clen) < netif->loop_cnt_current));
+ netif->loop_cnt_current -= clen;
+#endif /* LWIP_LOOPBACK_MAX_PBUFS */
+ while (in_end->len != in_end->tot_len) {
+ LWIP_ASSERT("bogus pbuf: len != tot_len but next == NULL!", in_end->next != NULL);
+ in_end = in_end->next;
+ }
+ /* 'in_end' now points to the last pbuf from 'in' */
+ if (in_end == netif->loop_last) {
+ /* this was the last pbuf in the list */
+ netif->loop_first = netif->loop_last = NULL;
+ } else {
+ /* pop the pbuf off the list */
+ netif->loop_first = in_end->next;
+ LWIP_ASSERT("should not be null since first != last!", netif->loop_first != NULL);
+ }
+ /* De-queue the pbuf from its successors on the 'loop_' list. */
+ in_end->next = NULL;
+ }
+ SYS_ARCH_UNPROTECT(lev);
+
+ if (in != NULL) {
+ LINK_STATS_INC(link.recv);
+ snmp_add_ifinoctets(stats_if, in->tot_len);
+ snmp_inc_ifinucastpkts(stats_if);
+ /* loopback packets are always IP packets! */
+ if (ip_input(in, netif) != ERR_OK) {
+ pbuf_free(in);
+ }
+ /* Don't reference the packet any more! */
+ in = NULL;
+ }
+ /* go on while there is a packet on the list */
+ } while (netif->loop_first != NULL);
+}
+
+#if !LWIP_NETIF_LOOPBACK_MULTITHREADING
+/**
+ * Calls netif_poll() for every netif on the netif_list.
+ */
+void
+netif_poll_all(void)
+{
+ struct netif *netif = netif_list;
+ /* loop through netifs */
+ while (netif != NULL) {
+ netif_poll(netif);
+ /* proceed to next network interface */
+ netif = netif->next;
+ }
+}
+#endif /* !LWIP_NETIF_LOOPBACK_MULTITHREADING */
+#endif /* ENABLE_LOOPBACK */
--- /dev/null
+/**
+ * @file
+ * Packet buffer management
+ *
+ * Packets are built from the pbuf data structure. It supports dynamic
+ * memory allocation for packet contents or can reference externally
+ * managed packet contents both in RAM and ROM. Quick allocation for
+ * incoming packets is provided through pools with fixed sized pbufs.
+ *
+ * A packet may span over multiple pbufs, chained as a singly linked
+ * list. This is called a "pbuf chain".
+ *
+ * Multiple packets may be queued, also using this singly linked list.
+ * This is called a "packet queue".
+ *
+ * So, a packet queue consists of one or more pbuf chains, each of
+ * which consist of one or more pbufs. CURRENTLY, PACKET QUEUES ARE
+ * NOT SUPPORTED!!! Use helper structs to queue multiple packets.
+ *
+ * The differences between a pbuf chain and a packet queue are very
+ * precise but subtle.
+ *
+ * The last pbuf of a packet has a ->tot_len field that equals the
+ * ->len field. It can be found by traversing the list. If the last
+ * pbuf of a packet has a ->next field other than NULL, more packets
+ * are on the queue.
+ *
+ * Therefore, looping through a pbuf of a single packet, has an
+ * loop end condition (tot_len == p->len), NOT (next == NULL).
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/stats.h"
+#include "lwip/def.h"
+#include "lwip/mem.h"
+#include "lwip/memp.h"
+#include "lwip/pbuf.h"
+#include "lwip/sys.h"
+#include "arch/perf.h"
+#if TCP_QUEUE_OOSEQ
+#include "lwip/tcp_impl.h"
+#endif
+#if LWIP_CHECKSUM_ON_COPY
+#include "lwip/inet_chksum.h"
+#endif
+
+#include <string.h>
+
+#define SIZEOF_STRUCT_PBUF LWIP_MEM_ALIGN_SIZE(sizeof(struct pbuf))
+/* Since the pool is created in memp, PBUF_POOL_BUFSIZE will be automatically
+ aligned there. Therefore, PBUF_POOL_BUFSIZE_ALIGNED can be used here. */
+#define PBUF_POOL_BUFSIZE_ALIGNED LWIP_MEM_ALIGN_SIZE(PBUF_POOL_BUFSIZE)
+
+#if !LWIP_TCP || !TCP_QUEUE_OOSEQ || NO_SYS
+#define PBUF_POOL_IS_EMPTY()
+#else /* !LWIP_TCP || !TCP_QUEUE_OOSEQ || NO_SYS */
+/** Define this to 0 to prevent freeing ooseq pbufs when the PBUF_POOL is empty */
+#ifndef PBUF_POOL_FREE_OOSEQ
+#define PBUF_POOL_FREE_OOSEQ 1
+#endif /* PBUF_POOL_FREE_OOSEQ */
+
+#if PBUF_POOL_FREE_OOSEQ
+#include "lwip/tcpip.h"
+#define PBUF_POOL_IS_EMPTY() pbuf_pool_is_empty()
+static u8_t pbuf_free_ooseq_queued;
+/**
+ * Attempt to reclaim some memory from queued out-of-sequence TCP segments
+ * if we run out of pool pbufs. It's better to give priority to new packets
+ * if we're running out.
+ *
+ * This must be done in the correct thread context therefore this function
+ * can only be used with NO_SYS=0 and through tcpip_callback.
+ */
+static void
+pbuf_free_ooseq(void* arg)
+{
+ struct tcp_pcb* pcb;
+ SYS_ARCH_DECL_PROTECT(old_level);
+ LWIP_UNUSED_ARG(arg);
+
+ SYS_ARCH_PROTECT(old_level);
+ pbuf_free_ooseq_queued = 0;
+ SYS_ARCH_UNPROTECT(old_level);
+
+ for (pcb = tcp_active_pcbs; NULL != pcb; pcb = pcb->next) {
+ if (NULL != pcb->ooseq) {
+ /** Free the ooseq pbufs of one PCB only */
+ LWIP_DEBUGF(PBUF_DEBUG | LWIP_DBG_TRACE, ("pbuf_free_ooseq: freeing out-of-sequence pbufs\n"));
+ tcp_segs_free(pcb->ooseq);
+ pcb->ooseq = NULL;
+ return;
+ }
+ }
+}
+
+/** Queue a call to pbuf_free_ooseq if not already queued. */
+static void
+pbuf_pool_is_empty(void)
+{
+ u8_t queued;
+ SYS_ARCH_DECL_PROTECT(old_level);
+
+ SYS_ARCH_PROTECT(old_level);
+ queued = pbuf_free_ooseq_queued;
+ pbuf_free_ooseq_queued = 1;
+ SYS_ARCH_UNPROTECT(old_level);
+
+ if(!queued) {
+ /* queue a call to pbuf_free_ooseq if not already queued */
+ if(tcpip_callback_with_block(pbuf_free_ooseq, NULL, 0) != ERR_OK) {
+ SYS_ARCH_PROTECT(old_level);
+ pbuf_free_ooseq_queued = 0;
+ SYS_ARCH_UNPROTECT(old_level);
+ }
+ }
+}
+#endif /* PBUF_POOL_FREE_OOSEQ */
+#endif /* !LWIP_TCP || !TCP_QUEUE_OOSEQ || NO_SYS */
+
+/**
+ * Allocates a pbuf of the given type (possibly a chain for PBUF_POOL type).
+ *
+ * The actual memory allocated for the pbuf is determined by the
+ * layer at which the pbuf is allocated and the requested size
+ * (from the size parameter).
+ *
+ * @param layer flag to define header size
+ * @param length size of the pbuf's payload
+ * @param type this parameter decides how and where the pbuf
+ * should be allocated as follows:
+ *
+ * - PBUF_RAM: buffer memory for pbuf is allocated as one large
+ * chunk. This includes protocol headers as well.
+ * - PBUF_ROM: no buffer memory is allocated for the pbuf, even for
+ * protocol headers. Additional headers must be prepended
+ * by allocating another pbuf and chain in to the front of
+ * the ROM pbuf. It is assumed that the memory used is really
+ * similar to ROM in that it is immutable and will not be
+ * changed. Memory which is dynamic should generally not
+ * be attached to PBUF_ROM pbufs. Use PBUF_REF instead.
+ * - PBUF_REF: no buffer memory is allocated for the pbuf, even for
+ * protocol headers. It is assumed that the pbuf is only
+ * being used in a single thread. If the pbuf gets queued,
+ * then pbuf_take should be called to copy the buffer.
+ * - PBUF_POOL: the pbuf is allocated as a pbuf chain, with pbufs from
+ * the pbuf pool that is allocated during pbuf_init().
+ *
+ * @return the allocated pbuf. If multiple pbufs where allocated, this
+ * is the first pbuf of a pbuf chain.
+ */
+struct pbuf *
+pbuf_alloc(pbuf_layer layer, u16_t length, pbuf_type type)
+{
+ struct pbuf *p, *q, *r;
+ u16_t offset;
+ s32_t rem_len; /* remaining length */
+ LWIP_DEBUGF(PBUF_DEBUG | LWIP_DBG_TRACE, ("pbuf_alloc(length=%"U16_F")\n", length));
+
+ /* determine header offset */
+ offset = 0;
+ switch (layer) {
+ case PBUF_TRANSPORT:
+ /* add room for transport (often TCP) layer header */
+ offset += PBUF_TRANSPORT_HLEN;
+ /* FALLTHROUGH */
+ case PBUF_IP:
+ /* add room for IP layer header */
+ offset += PBUF_IP_HLEN;
+ /* FALLTHROUGH */
+ case PBUF_LINK:
+ /* add room for link layer header */
+ offset += PBUF_LINK_HLEN;
+ break;
+ case PBUF_RAW:
+ break;
+ default:
+ LWIP_ASSERT("pbuf_alloc: bad pbuf layer", 0);
+ return NULL;
+ }
+
+ switch (type) {
+ case PBUF_POOL:
+ /* allocate head of pbuf chain into p */
+ p = (struct pbuf *)memp_malloc(MEMP_PBUF_POOL);
+ LWIP_DEBUGF(PBUF_DEBUG | LWIP_DBG_TRACE, ("pbuf_alloc: allocated pbuf %p\n", (void *)p));
+ if (p == NULL) {
+ PBUF_POOL_IS_EMPTY();
+ return NULL;
+ }
+ p->type = type;
+ p->next = NULL;
+
+ /* make the payload pointer point 'offset' bytes into pbuf data memory */
+ p->payload = LWIP_MEM_ALIGN((void *)((u8_t *)p + (SIZEOF_STRUCT_PBUF + offset)));
+ LWIP_ASSERT("pbuf_alloc: pbuf p->payload properly aligned",
+ ((mem_ptr_t)p->payload % MEM_ALIGNMENT) == 0);
+ /* the total length of the pbuf chain is the requested size */
+ p->tot_len = length;
+ /* set the length of the first pbuf in the chain */
+ p->len = LWIP_MIN(length, PBUF_POOL_BUFSIZE_ALIGNED - LWIP_MEM_ALIGN_SIZE(offset));
+ LWIP_ASSERT("check p->payload + p->len does not overflow pbuf",
+ ((u8_t*)p->payload + p->len <=
+ (u8_t*)p + SIZEOF_STRUCT_PBUF + PBUF_POOL_BUFSIZE_ALIGNED));
+ LWIP_ASSERT("PBUF_POOL_BUFSIZE must be bigger than MEM_ALIGNMENT",
+ (PBUF_POOL_BUFSIZE_ALIGNED - LWIP_MEM_ALIGN_SIZE(offset)) > 0 );
+ /* set reference count (needed here in case we fail) */
+ p->ref = 1;
+
+ /* now allocate the tail of the pbuf chain */
+
+ /* remember first pbuf for linkage in next iteration */
+ r = p;
+ /* remaining length to be allocated */
+ rem_len = length - p->len;
+ /* any remaining pbufs to be allocated? */
+ while (rem_len > 0) {
+ q = (struct pbuf *)memp_malloc(MEMP_PBUF_POOL);
+ if (q == NULL) {
+ PBUF_POOL_IS_EMPTY();
+ /* free chain so far allocated */
+ pbuf_free(p);
+ /* bail out unsuccesfully */
+ return NULL;
+ }
+ q->type = type;
+ q->flags = 0;
+ q->next = NULL;
+ /* make previous pbuf point to this pbuf */
+ r->next = q;
+ /* set total length of this pbuf and next in chain */
+ LWIP_ASSERT("rem_len < max_u16_t", rem_len < 0xffff);
+ q->tot_len = (u16_t)rem_len;
+ /* this pbuf length is pool size, unless smaller sized tail */
+ q->len = LWIP_MIN((u16_t)rem_len, PBUF_POOL_BUFSIZE_ALIGNED);
+ q->payload = (void *)((u8_t *)q + SIZEOF_STRUCT_PBUF);
+ LWIP_ASSERT("pbuf_alloc: pbuf q->payload properly aligned",
+ ((mem_ptr_t)q->payload % MEM_ALIGNMENT) == 0);
+ LWIP_ASSERT("check p->payload + p->len does not overflow pbuf",
+ ((u8_t*)p->payload + p->len <=
+ (u8_t*)p + SIZEOF_STRUCT_PBUF + PBUF_POOL_BUFSIZE_ALIGNED));
+ q->ref = 1;
+ /* calculate remaining length to be allocated */
+ rem_len -= q->len;
+ /* remember this pbuf for linkage in next iteration */
+ r = q;
+ }
+ /* end of chain */
+ /*r->next = NULL;*/
+
+ break;
+ case PBUF_RAM:
+ /* If pbuf is to be allocated in RAM, allocate memory for it. */
+ p = (struct pbuf*)mem_malloc(LWIP_MEM_ALIGN_SIZE(SIZEOF_STRUCT_PBUF + offset) + LWIP_MEM_ALIGN_SIZE(length));
+ if (p == NULL) {
+ return NULL;
+ }
+ /* Set up internal structure of the pbuf. */
+ p->payload = LWIP_MEM_ALIGN((void *)((u8_t *)p + SIZEOF_STRUCT_PBUF + offset));
+ p->len = p->tot_len = length;
+ p->next = NULL;
+ p->type = type;
+
+ LWIP_ASSERT("pbuf_alloc: pbuf->payload properly aligned",
+ ((mem_ptr_t)p->payload % MEM_ALIGNMENT) == 0);
+ break;
+ /* pbuf references existing (non-volatile static constant) ROM payload? */
+ case PBUF_ROM:
+ /* pbuf references existing (externally allocated) RAM payload? */
+ case PBUF_REF:
+ /* only allocate memory for the pbuf structure */
+ p = (struct pbuf *)memp_malloc(MEMP_PBUF);
+ if (p == NULL) {
+ LWIP_DEBUGF(PBUF_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
+ ("pbuf_alloc: Could not allocate MEMP_PBUF for PBUF_%s.\n",
+ (type == PBUF_ROM) ? "ROM" : "REF"));
+ return NULL;
+ }
+ /* caller must set this field properly, afterwards */
+ p->payload = NULL;
+ p->len = p->tot_len = length;
+ p->next = NULL;
+ p->type = type;
+ break;
+ default:
+ LWIP_ASSERT("pbuf_alloc: erroneous type", 0);
+ return NULL;
+ }
+ /* set reference count */
+ p->ref = 1;
+ /* set flags */
+ p->flags = 0;
+ LWIP_DEBUGF(PBUF_DEBUG | LWIP_DBG_TRACE, ("pbuf_alloc(length=%"U16_F") == %p\n", length, (void *)p));
+ return p;
+}
+
+#if LWIP_SUPPORT_CUSTOM_PBUF
+/** Initialize a custom pbuf (already allocated).
+ *
+ * @param layer flag to define header size
+ * @param length size of the pbuf's payload
+ * @param type type of the pbuf (only used to treat the pbuf accordingly, as
+ * this function allocates no memory)
+ * @param p pointer to the custom pbuf to initialize (already allocated)
+ * @param payload_mem pointer to the buffer that is used for payload and headers,
+ * must be at least big enough to hold 'length' plus the header size,
+ * may be NULL if set later
+ * @param payload_mem_len the size of the 'payload_mem' buffer, must be at least
+ * big enough to hold 'length' plus the header size
+ */
+struct pbuf*
+pbuf_alloced_custom(pbuf_layer l, u16_t length, pbuf_type type, struct pbuf_custom *p,
+ void *payload_mem, u16_t payload_mem_len)
+{
+ u16_t offset;
+ LWIP_DEBUGF(PBUF_DEBUG | LWIP_DBG_TRACE, ("pbuf_alloced_custom(length=%"U16_F")\n", length));
+
+ /* determine header offset */
+ offset = 0;
+ switch (l) {
+ case PBUF_TRANSPORT:
+ /* add room for transport (often TCP) layer header */
+ offset += PBUF_TRANSPORT_HLEN;
+ /* FALLTHROUGH */
+ case PBUF_IP:
+ /* add room for IP layer header */
+ offset += PBUF_IP_HLEN;
+ /* FALLTHROUGH */
+ case PBUF_LINK:
+ /* add room for link layer header */
+ offset += PBUF_LINK_HLEN;
+ break;
+ case PBUF_RAW:
+ break;
+ default:
+ LWIP_ASSERT("pbuf_alloced_custom: bad pbuf layer", 0);
+ return NULL;
+ }
+
+ if (LWIP_MEM_ALIGN_SIZE(offset) + length < payload_mem_len) {
+ LWIP_DEBUGF(PBUF_DEBUG | LWIP_DBG_LEVEL_WARNING, ("pbuf_alloced_custom(length=%"U16_F") buffer too short\n", length));
+ return NULL;
+ }
+
+ p->pbuf.next = NULL;
+ if (payload_mem != NULL) {
+ p->pbuf.payload = LWIP_MEM_ALIGN((void *)((u8_t *)payload_mem + offset));
+ } else {
+ p->pbuf.payload = NULL;
+ }
+ p->pbuf.flags = PBUF_FLAG_IS_CUSTOM;
+ p->pbuf.len = p->pbuf.tot_len = length;
+ p->pbuf.type = type;
+ p->pbuf.ref = 1;
+ return &p->pbuf;
+}
+#endif /* LWIP_SUPPORT_CUSTOM_PBUF */
+
+/**
+ * Shrink a pbuf chain to a desired length.
+ *
+ * @param p pbuf to shrink.
+ * @param new_len desired new length of pbuf chain
+ *
+ * Depending on the desired length, the first few pbufs in a chain might
+ * be skipped and left unchanged. The new last pbuf in the chain will be
+ * resized, and any remaining pbufs will be freed.
+ *
+ * @note If the pbuf is ROM/REF, only the ->tot_len and ->len fields are adjusted.
+ * @note May not be called on a packet queue.
+ *
+ * @note Despite its name, pbuf_realloc cannot grow the size of a pbuf (chain).
+ */
+void
+pbuf_realloc(struct pbuf *p, u16_t new_len)
+{
+ struct pbuf *q;
+ u16_t rem_len; /* remaining length */
+ s32_t grow;
+
+ LWIP_ASSERT("pbuf_realloc: p != NULL", p != NULL);
+ LWIP_ASSERT("pbuf_realloc: sane p->type", p->type == PBUF_POOL ||
+ p->type == PBUF_ROM ||
+ p->type == PBUF_RAM ||
+ p->type == PBUF_REF);
+
+ /* desired length larger than current length? */
+ if (new_len >= p->tot_len) {
+ /* enlarging not yet supported */
+ return;
+ }
+
+ /* the pbuf chain grows by (new_len - p->tot_len) bytes
+ * (which may be negative in case of shrinking) */
+ grow = new_len - p->tot_len;
+
+ /* first, step over any pbufs that should remain in the chain */
+ rem_len = new_len;
+ q = p;
+ /* should this pbuf be kept? */
+ while (rem_len > q->len) {
+ /* decrease remaining length by pbuf length */
+ rem_len -= q->len;
+ /* decrease total length indicator */
+ LWIP_ASSERT("grow < max_u16_t", grow < 0xffff);
+ q->tot_len += (u16_t)grow;
+ /* proceed to next pbuf in chain */
+ q = q->next;
+ LWIP_ASSERT("pbuf_realloc: q != NULL", q != NULL);
+ }
+ /* we have now reached the new last pbuf (in q) */
+ /* rem_len == desired length for pbuf q */
+
+ /* shrink allocated memory for PBUF_RAM */
+ /* (other types merely adjust their length fields */
+ if ((q->type == PBUF_RAM) && (rem_len != q->len)) {
+ /* reallocate and adjust the length of the pbuf that will be split */
+ q = (struct pbuf *)mem_trim(q, (u16_t)((u8_t *)q->payload - (u8_t *)q) + rem_len);
+ LWIP_ASSERT("mem_trim returned q == NULL", q != NULL);
+ }
+ /* adjust length fields for new last pbuf */
+ q->len = rem_len;
+ q->tot_len = q->len;
+
+ /* any remaining pbufs in chain? */
+ if (q->next != NULL) {
+ /* free remaining pbufs in chain */
+ pbuf_free(q->next);
+ }
+ /* q is last packet in chain */
+ q->next = NULL;
+
+}
+
+/**
+ * Adjusts the payload pointer to hide or reveal headers in the payload.
+ *
+ * Adjusts the ->payload pointer so that space for a header
+ * (dis)appears in the pbuf payload.
+ *
+ * The ->payload, ->tot_len and ->len fields are adjusted.
+ *
+ * @param p pbuf to change the header size.
+ * @param header_size_increment Number of bytes to increment header size which
+ * increases the size of the pbuf. New space is on the front.
+ * (Using a negative value decreases the header size.)
+ * If hdr_size_inc is 0, this function does nothing and returns succesful.
+ *
+ * PBUF_ROM and PBUF_REF type buffers cannot have their sizes increased, so
+ * the call will fail. A check is made that the increase in header size does
+ * not move the payload pointer in front of the start of the buffer.
+ * @return non-zero on failure, zero on success.
+ *
+ */
+u8_t
+pbuf_header(struct pbuf *p, s16_t header_size_increment)
+{
+ u16_t type;
+ void *payload;
+ u16_t increment_magnitude;
+
+ LWIP_ASSERT("p != NULL", p != NULL);
+ if ((header_size_increment == 0) || (p == NULL)) {
+ return 0;
+ }
+
+ if (header_size_increment < 0){
+ increment_magnitude = -header_size_increment;
+ /* Check that we aren't going to move off the end of the pbuf */
+ LWIP_ERROR("increment_magnitude <= p->len", (increment_magnitude <= p->len), return 1;);
+ } else {
+ increment_magnitude = header_size_increment;
+#if 0
+ /* Can't assert these as some callers speculatively call
+ pbuf_header() to see if it's OK. Will return 1 below instead. */
+ /* Check that we've got the correct type of pbuf to work with */
+ LWIP_ASSERT("p->type == PBUF_RAM || p->type == PBUF_POOL",
+ p->type == PBUF_RAM || p->type == PBUF_POOL);
+ /* Check that we aren't going to move off the beginning of the pbuf */
+ LWIP_ASSERT("p->payload - increment_magnitude >= p + SIZEOF_STRUCT_PBUF",
+ (u8_t *)p->payload - increment_magnitude >= (u8_t *)p + SIZEOF_STRUCT_PBUF);
+#endif
+ }
+
+ type = p->type;
+ /* remember current payload pointer */
+ payload = p->payload;
+
+ /* pbuf types containing payloads? */
+ if (type == PBUF_RAM || type == PBUF_POOL) {
+ /* set new payload pointer */
+ p->payload = (u8_t *)p->payload - header_size_increment;
+ /* boundary check fails? */
+ if ((u8_t *)p->payload < (u8_t *)p + SIZEOF_STRUCT_PBUF) {
+ LWIP_DEBUGF( PBUF_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
+ ("pbuf_header: failed as %p < %p (not enough space for new header size)\n",
+ (void *)p->payload, (void *)(p + 1)));
+ /* restore old payload pointer */
+ p->payload = payload;
+ /* bail out unsuccesfully */
+ return 1;
+ }
+ /* pbuf types refering to external payloads? */
+ } else if (type == PBUF_REF || type == PBUF_ROM) {
+ /* hide a header in the payload? */
+ if ((header_size_increment < 0) && (increment_magnitude <= p->len)) {
+ /* increase payload pointer */
+ p->payload = (u8_t *)p->payload - header_size_increment;
+ } else {
+ /* cannot expand payload to front (yet!)
+ * bail out unsuccesfully */
+ return 1;
+ }
+ } else {
+ /* Unknown type */
+ LWIP_ASSERT("bad pbuf type", 0);
+ return 1;
+ }
+ /* modify pbuf length fields */
+ p->len += header_size_increment;
+ p->tot_len += header_size_increment;
+
+ LWIP_DEBUGF(PBUF_DEBUG | LWIP_DBG_TRACE, ("pbuf_header: old %p new %p (%"S16_F")\n",
+ (void *)payload, (void *)p->payload, header_size_increment));
+
+ return 0;
+}
+
+/**
+ * Dereference a pbuf chain or queue and deallocate any no-longer-used
+ * pbufs at the head of this chain or queue.
+ *
+ * Decrements the pbuf reference count. If it reaches zero, the pbuf is
+ * deallocated.
+ *
+ * For a pbuf chain, this is repeated for each pbuf in the chain,
+ * up to the first pbuf which has a non-zero reference count after
+ * decrementing. So, when all reference counts are one, the whole
+ * chain is free'd.
+ *
+ * @param p The pbuf (chain) to be dereferenced.
+ *
+ * @return the number of pbufs that were de-allocated
+ * from the head of the chain.
+ *
+ * @note MUST NOT be called on a packet queue (Not verified to work yet).
+ * @note the reference counter of a pbuf equals the number of pointers
+ * that refer to the pbuf (or into the pbuf).
+ *
+ * @internal examples:
+ *
+ * Assuming existing chains a->b->c with the following reference
+ * counts, calling pbuf_free(a) results in:
+ *
+ * 1->2->3 becomes ...1->3
+ * 3->3->3 becomes 2->3->3
+ * 1->1->2 becomes ......1
+ * 2->1->1 becomes 1->1->1
+ * 1->1->1 becomes .......
+ *
+ */
+u8_t
+pbuf_free(struct pbuf *p)
+{
+ u16_t type;
+ struct pbuf *q;
+ u8_t count;
+
+ if (p == NULL) {
+ LWIP_ASSERT("p != NULL", p != NULL);
+ /* if assertions are disabled, proceed with debug output */
+ LWIP_DEBUGF(PBUF_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
+ ("pbuf_free(p == NULL) was called.\n"));
+ return 0;
+ }
+ LWIP_DEBUGF(PBUF_DEBUG | LWIP_DBG_TRACE, ("pbuf_free(%p)\n", (void *)p));
+
+ PERF_START;
+
+ LWIP_ASSERT("pbuf_free: sane type",
+ p->type == PBUF_RAM || p->type == PBUF_ROM ||
+ p->type == PBUF_REF || p->type == PBUF_POOL);
+
+ count = 0;
+ /* de-allocate all consecutive pbufs from the head of the chain that
+ * obtain a zero reference count after decrementing*/
+ while (p != NULL) {
+ u16_t ref;
+ SYS_ARCH_DECL_PROTECT(old_level);
+ /* Since decrementing ref cannot be guaranteed to be a single machine operation
+ * we must protect it. We put the new ref into a local variable to prevent
+ * further protection. */
+ SYS_ARCH_PROTECT(old_level);
+ /* all pbufs in a chain are referenced at least once */
+ LWIP_ASSERT("pbuf_free: p->ref > 0", p->ref > 0);
+ /* decrease reference count (number of pointers to pbuf) */
+ ref = --(p->ref);
+ SYS_ARCH_UNPROTECT(old_level);
+ /* this pbuf is no longer referenced to? */
+ if (ref == 0) {
+ /* remember next pbuf in chain for next iteration */
+ q = p->next;
+ LWIP_DEBUGF( PBUF_DEBUG | LWIP_DBG_TRACE, ("pbuf_free: deallocating %p\n", (void *)p));
+ type = p->type;
+#if LWIP_SUPPORT_CUSTOM_PBUF
+ /* is this a custom pbuf? */
+ if ((p->flags & PBUF_FLAG_IS_CUSTOM) != 0) {
+ struct pbuf_custom *pc = (struct pbuf_custom*)p;
+ LWIP_ASSERT("pc->custom_free_function != NULL", pc->custom_free_function != NULL);
+ pc->custom_free_function(p);
+ } else
+#endif /* LWIP_SUPPORT_CUSTOM_PBUF */
+ {
+ /* is this a pbuf from the pool? */
+ if (type == PBUF_POOL) {
+ memp_free(MEMP_PBUF_POOL, p);
+ /* is this a ROM or RAM referencing pbuf? */
+ } else if (type == PBUF_ROM || type == PBUF_REF) {
+ memp_free(MEMP_PBUF, p);
+ /* type == PBUF_RAM */
+ } else {
+ mem_free(p);
+ }
+ }
+ count++;
+ /* proceed to next pbuf */
+ p = q;
+ /* p->ref > 0, this pbuf is still referenced to */
+ /* (and so the remaining pbufs in chain as well) */
+ } else {
+ LWIP_DEBUGF( PBUF_DEBUG | LWIP_DBG_TRACE, ("pbuf_free: %p has ref %"U16_F", ending here.\n", (void *)p, ref));
+ /* stop walking through the chain */
+ p = NULL;
+ }
+ }
+ PERF_STOP("pbuf_free");
+ /* return number of de-allocated pbufs */
+ return count;
+}
+
+/**
+ * Count number of pbufs in a chain
+ *
+ * @param p first pbuf of chain
+ * @return the number of pbufs in a chain
+ */
+
+u8_t
+pbuf_clen(struct pbuf *p)
+{
+ u8_t len;
+
+ len = 0;
+ while (p != NULL) {
+ ++len;
+ p = p->next;
+ }
+ return len;
+}
+
+/**
+ * Increment the reference count of the pbuf.
+ *
+ * @param p pbuf to increase reference counter of
+ *
+ */
+void
+pbuf_ref(struct pbuf *p)
+{
+ SYS_ARCH_DECL_PROTECT(old_level);
+ /* pbuf given? */
+ if (p != NULL) {
+ SYS_ARCH_PROTECT(old_level);
+ ++(p->ref);
+ SYS_ARCH_UNPROTECT(old_level);
+ }
+}
+
+/**
+ * Concatenate two pbufs (each may be a pbuf chain) and take over
+ * the caller's reference of the tail pbuf.
+ *
+ * @note The caller MAY NOT reference the tail pbuf afterwards.
+ * Use pbuf_chain() for that purpose.
+ *
+ * @see pbuf_chain()
+ */
+
+void
+pbuf_cat(struct pbuf *h, struct pbuf *t)
+{
+ struct pbuf *p;
+
+ LWIP_ERROR("(h != NULL) && (t != NULL) (programmer violates API)",
+ ((h != NULL) && (t != NULL)), return;);
+
+ /* proceed to last pbuf of chain */
+ for (p = h; p->next != NULL; p = p->next) {
+ /* add total length of second chain to all totals of first chain */
+ p->tot_len += t->tot_len;
+ }
+ /* { p is last pbuf of first h chain, p->next == NULL } */
+ LWIP_ASSERT("p->tot_len == p->len (of last pbuf in chain)", p->tot_len == p->len);
+ LWIP_ASSERT("p->next == NULL", p->next == NULL);
+ /* add total length of second chain to last pbuf total of first chain */
+ p->tot_len += t->tot_len;
+ /* chain last pbuf of head (p) with first of tail (t) */
+ p->next = t;
+ /* p->next now references t, but the caller will drop its reference to t,
+ * so netto there is no change to the reference count of t.
+ */
+}
+
+/**
+ * Chain two pbufs (or pbuf chains) together.
+ *
+ * The caller MUST call pbuf_free(t) once it has stopped
+ * using it. Use pbuf_cat() instead if you no longer use t.
+ *
+ * @param h head pbuf (chain)
+ * @param t tail pbuf (chain)
+ * @note The pbufs MUST belong to the same packet.
+ * @note MAY NOT be called on a packet queue.
+ *
+ * The ->tot_len fields of all pbufs of the head chain are adjusted.
+ * The ->next field of the last pbuf of the head chain is adjusted.
+ * The ->ref field of the first pbuf of the tail chain is adjusted.
+ *
+ */
+void
+pbuf_chain(struct pbuf *h, struct pbuf *t)
+{
+ pbuf_cat(h, t);
+ /* t is now referenced by h */
+ pbuf_ref(t);
+ LWIP_DEBUGF(PBUF_DEBUG | LWIP_DBG_TRACE, ("pbuf_chain: %p references %p\n", (void *)h, (void *)t));
+}
+
+/**
+ * Dechains the first pbuf from its succeeding pbufs in the chain.
+ *
+ * Makes p->tot_len field equal to p->len.
+ * @param p pbuf to dechain
+ * @return remainder of the pbuf chain, or NULL if it was de-allocated.
+ * @note May not be called on a packet queue.
+ */
+struct pbuf *
+pbuf_dechain(struct pbuf *p)
+{
+ struct pbuf *q;
+ u8_t tail_gone = 1;
+ /* tail */
+ q = p->next;
+ /* pbuf has successor in chain? */
+ if (q != NULL) {
+ /* assert tot_len invariant: (p->tot_len == p->len + (p->next? p->next->tot_len: 0) */
+ LWIP_ASSERT("p->tot_len == p->len + q->tot_len", q->tot_len == p->tot_len - p->len);
+ /* enforce invariant if assertion is disabled */
+ q->tot_len = p->tot_len - p->len;
+ /* decouple pbuf from remainder */
+ p->next = NULL;
+ /* total length of pbuf p is its own length only */
+ p->tot_len = p->len;
+ /* q is no longer referenced by p, free it */
+ LWIP_DEBUGF(PBUF_DEBUG | LWIP_DBG_TRACE, ("pbuf_dechain: unreferencing %p\n", (void *)q));
+ tail_gone = pbuf_free(q);
+ if (tail_gone > 0) {
+ LWIP_DEBUGF(PBUF_DEBUG | LWIP_DBG_TRACE,
+ ("pbuf_dechain: deallocated %p (as it is no longer referenced)\n", (void *)q));
+ }
+ /* return remaining tail or NULL if deallocated */
+ }
+ /* assert tot_len invariant: (p->tot_len == p->len + (p->next? p->next->tot_len: 0) */
+ LWIP_ASSERT("p->tot_len == p->len", p->tot_len == p->len);
+ return ((tail_gone > 0) ? NULL : q);
+}
+
+/**
+ *
+ * Create PBUF_RAM copies of pbufs.
+ *
+ * Used to queue packets on behalf of the lwIP stack, such as
+ * ARP based queueing.
+ *
+ * @note You MUST explicitly use p = pbuf_take(p);
+ *
+ * @note Only one packet is copied, no packet queue!
+ *
+ * @param p_to pbuf destination of the copy
+ * @param p_from pbuf source of the copy
+ *
+ * @return ERR_OK if pbuf was copied
+ * ERR_ARG if one of the pbufs is NULL or p_to is not big
+ * enough to hold p_from
+ */
+err_t
+pbuf_copy(struct pbuf *p_to, struct pbuf *p_from)
+{
+ u16_t offset_to=0, offset_from=0, len;
+
+ LWIP_DEBUGF(PBUF_DEBUG | LWIP_DBG_TRACE, ("pbuf_copy(%p, %p)\n",
+ (void*)p_to, (void*)p_from));
+
+ /* is the target big enough to hold the source? */
+ LWIP_ERROR("pbuf_copy: target not big enough to hold source", ((p_to != NULL) &&
+ (p_from != NULL) && (p_to->tot_len >= p_from->tot_len)), return ERR_ARG;);
+
+ /* iterate through pbuf chain */
+ do
+ {
+ LWIP_ASSERT("p_to != NULL", p_to != NULL);
+ /* copy one part of the original chain */
+ if ((p_to->len - offset_to) >= (p_from->len - offset_from)) {
+ /* complete current p_from fits into current p_to */
+ len = p_from->len - offset_from;
+ } else {
+ /* current p_from does not fit into current p_to */
+ len = p_to->len - offset_to;
+ }
+ MEMCPY((u8_t*)p_to->payload + offset_to, (u8_t*)p_from->payload + offset_from, len);
+ offset_to += len;
+ offset_from += len;
+ LWIP_ASSERT("offset_to <= p_to->len", offset_to <= p_to->len);
+ if (offset_to == p_to->len) {
+ /* on to next p_to (if any) */
+ offset_to = 0;
+ p_to = p_to->next;
+ }
+ LWIP_ASSERT("offset_from <= p_from->len", offset_from <= p_from->len);
+ if (offset_from >= p_from->len) {
+ /* on to next p_from (if any) */
+ offset_from = 0;
+ p_from = p_from->next;
+ }
+
+ if((p_from != NULL) && (p_from->len == p_from->tot_len)) {
+ /* don't copy more than one packet! */
+ LWIP_ERROR("pbuf_copy() does not allow packet queues!\n",
+ (p_from->next == NULL), return ERR_VAL;);
+ }
+ if((p_to != NULL) && (p_to->len == p_to->tot_len)) {
+ /* don't copy more than one packet! */
+ LWIP_ERROR("pbuf_copy() does not allow packet queues!\n",
+ (p_to->next == NULL), return ERR_VAL;);
+ }
+ } while (p_from);
+ LWIP_DEBUGF(PBUF_DEBUG | LWIP_DBG_TRACE, ("pbuf_copy: end of chain reached.\n"));
+ return ERR_OK;
+}
+
+/**
+ * Copy (part of) the contents of a packet buffer
+ * to an application supplied buffer.
+ *
+ * @param buf the pbuf from which to copy data
+ * @param dataptr the application supplied buffer
+ * @param len length of data to copy (dataptr must be big enough). No more
+ * than buf->tot_len will be copied, irrespective of len
+ * @param offset offset into the packet buffer from where to begin copying len bytes
+ * @return the number of bytes copied, or 0 on failure
+ */
+u16_t
+pbuf_copy_partial(struct pbuf *buf, void *dataptr, u16_t len, u16_t offset)
+{
+ struct pbuf *p;
+ u16_t left;
+ u16_t buf_copy_len;
+ u16_t copied_total = 0;
+
+ LWIP_ERROR("pbuf_copy_partial: invalid buf", (buf != NULL), return 0;);
+ LWIP_ERROR("pbuf_copy_partial: invalid dataptr", (dataptr != NULL), return 0;);
+
+ left = 0;
+
+ if((buf == NULL) || (dataptr == NULL)) {
+ return 0;
+ }
+
+ /* Note some systems use byte copy if dataptr or one of the pbuf payload pointers are unaligned. */
+ for(p = buf; len != 0 && p != NULL; p = p->next) {
+ if ((offset != 0) && (offset >= p->len)) {
+ /* don't copy from this buffer -> on to the next */
+ offset -= p->len;
+ } else {
+ /* copy from this buffer. maybe only partially. */
+ buf_copy_len = p->len - offset;
+ if (buf_copy_len > len)
+ buf_copy_len = len;
+ /* copy the necessary parts of the buffer */
+ MEMCPY(&((char*)dataptr)[left], &((char*)p->payload)[offset], buf_copy_len);
+ copied_total += buf_copy_len;
+ left += buf_copy_len;
+ len -= buf_copy_len;
+ offset = 0;
+ }
+ }
+ return copied_total;
+}
+
+/**
+ * Copy application supplied data into a pbuf.
+ * This function can only be used to copy the equivalent of buf->tot_len data.
+ *
+ * @param buf pbuf to fill with data
+ * @param dataptr application supplied data buffer
+ * @param len length of the application supplied data buffer
+ *
+ * @return ERR_OK if successful, ERR_MEM if the pbuf is not big enough
+ */
+err_t
+pbuf_take(struct pbuf *buf, const void *dataptr, u16_t len)
+{
+ struct pbuf *p;
+ u16_t buf_copy_len;
+ u16_t total_copy_len = len;
+ u16_t copied_total = 0;
+
+ LWIP_ERROR("pbuf_take: invalid buf", (buf != NULL), return 0;);
+ LWIP_ERROR("pbuf_take: invalid dataptr", (dataptr != NULL), return 0;);
+
+ if ((buf == NULL) || (dataptr == NULL) || (buf->tot_len < len)) {
+ return ERR_ARG;
+ }
+
+ /* Note some systems use byte copy if dataptr or one of the pbuf payload pointers are unaligned. */
+ for(p = buf; total_copy_len != 0; p = p->next) {
+ LWIP_ASSERT("pbuf_take: invalid pbuf", p != NULL);
+ buf_copy_len = total_copy_len;
+ if (buf_copy_len > p->len) {
+ /* this pbuf cannot hold all remaining data */
+ buf_copy_len = p->len;
+ }
+ /* copy the necessary parts of the buffer */
+ MEMCPY(p->payload, &((char*)dataptr)[copied_total], buf_copy_len);
+ total_copy_len -= buf_copy_len;
+ copied_total += buf_copy_len;
+ }
+ LWIP_ASSERT("did not copy all data", total_copy_len == 0 && copied_total == len);
+ return ERR_OK;
+}
+
+/**
+ * Creates a single pbuf out of a queue of pbufs.
+ *
+ * @remark: Either the source pbuf 'p' is freed by this function or the original
+ * pbuf 'p' is returned, therefore the caller has to check the result!
+ *
+ * @param p the source pbuf
+ * @param layer pbuf_layer of the new pbuf
+ *
+ * @return a new, single pbuf (p->next is NULL)
+ * or the old pbuf if allocation fails
+ */
+struct pbuf*
+pbuf_coalesce(struct pbuf *p, pbuf_layer layer)
+{
+ struct pbuf *q;
+ err_t err;
+ if (p->next == NULL) {
+ return p;
+ }
+ q = pbuf_alloc(layer, p->tot_len, PBUF_RAM);
+ if (q == NULL) {
+ /* @todo: what do we do now? */
+ return p;
+ }
+ err = pbuf_copy(q, p);
+ LWIP_ASSERT("pbuf_copy failed", err == ERR_OK);
+ pbuf_free(p);
+ return q;
+}
+
+#if LWIP_CHECKSUM_ON_COPY
+/**
+ * Copies data into a single pbuf (*not* into a pbuf queue!) and updates
+ * the checksum while copying
+ *
+ * @param p the pbuf to copy data into
+ * @param start_offset offset of p->payload where to copy the data to
+ * @param dataptr data to copy into the pbuf
+ * @param len length of data to copy into the pbuf
+ * @param chksum pointer to the checksum which is updated
+ * @return ERR_OK if successful, another error if the data does not fit
+ * within the (first) pbuf (no pbuf queues!)
+ */
+err_t
+pbuf_fill_chksum(struct pbuf *p, u16_t start_offset, const void *dataptr,
+ u16_t len, u16_t *chksum)
+{
+ u32_t acc;
+ u16_t copy_chksum;
+ char *dst_ptr;
+ LWIP_ASSERT("p != NULL", p != NULL);
+ LWIP_ASSERT("dataptr != NULL", dataptr != NULL);
+ LWIP_ASSERT("chksum != NULL", chksum != NULL);
+ LWIP_ASSERT("len != 0", len != 0);
+
+ if ((start_offset >= p->len) || (start_offset + len > p->len)) {
+ return ERR_ARG;
+ }
+
+ dst_ptr = ((char*)p->payload) + start_offset;
+ copy_chksum = LWIP_CHKSUM_COPY(dst_ptr, dataptr, len);
+ if ((start_offset & 1) != 0) {
+ copy_chksum = SWAP_BYTES_IN_WORD(copy_chksum);
+ }
+ acc = *chksum;
+ acc += copy_chksum;
+ *chksum = FOLD_U32T(acc);
+ return ERR_OK;
+}
+#endif /* LWIP_CHECKSUM_ON_COPY */
+
+ /** Get one byte from the specified position in a pbuf
+ * WARNING: returns zero for offset >= p->tot_len
+ *
+ * @param p pbuf to parse
+ * @param offset offset into p of the byte to return
+ * @return byte at an offset into p OR ZERO IF 'offset' >= p->tot_len
+ */
+u8_t
+pbuf_get_at(struct pbuf* p, u16_t offset)
+{
+ u16_t copy_from = offset;
+ struct pbuf* q = p;
+
+ /* get the correct pbuf */
+ while ((q != NULL) && (q->len <= copy_from)) {
+ copy_from -= q->len;
+ q = q->next;
+ }
+ /* return requested data if pbuf is OK */
+ if ((q != NULL) && (q->len > copy_from)) {
+ return ((u8_t*)q->payload)[copy_from];
+ }
+ return 0;
+}
+
+/** Compare pbuf contents at specified offset with memory s2, both of length n
+ *
+ * @param p pbuf to compare
+ * @param offset offset into p at wich to start comparing
+ * @param s2 buffer to compare
+ * @param n length of buffer to compare
+ * @return zero if equal, nonzero otherwise
+ * (0xffff if p is too short, diffoffset+1 otherwise)
+ */
+u16_t
+pbuf_memcmp(struct pbuf* p, u16_t offset, const void* s2, u16_t n)
+{
+ u16_t start = offset;
+ struct pbuf* q = p;
+
+ /* get the correct pbuf */
+ while ((q != NULL) && (q->len <= start)) {
+ start -= q->len;
+ q = q->next;
+ }
+ /* return requested data if pbuf is OK */
+ if ((q != NULL) && (q->len > start)) {
+ u16_t i;
+ for(i = 0; i < n; i++) {
+ u8_t a = pbuf_get_at(q, start + i);
+ u8_t b = ((u8_t*)s2)[i];
+ if (a != b) {
+ return i+1;
+ }
+ }
+ return 0;
+ }
+ return 0xffff;
+}
+
+/** Find occurrence of mem (with length mem_len) in pbuf p, starting at offset
+ * start_offset.
+ *
+ * @param p pbuf to search, maximum length is 0xFFFE since 0xFFFF is used as
+ * return value 'not found'
+ * @param mem search for the contents of this buffer
+ * @param mem_len length of 'mem'
+ * @param start_offset offset into p at which to start searching
+ * @return 0xFFFF if substr was not found in p or the index where it was found
+ */
+u16_t
+pbuf_memfind(struct pbuf* p, const void* mem, u16_t mem_len, u16_t start_offset)
+{
+ u16_t i;
+ u16_t max = p->tot_len - mem_len;
+ if (p->tot_len >= mem_len + start_offset) {
+ for(i = start_offset; i <= max; ) {
+ u16_t plus = pbuf_memcmp(p, i, mem, mem_len);
+ if (plus == 0) {
+ return i;
+ } else {
+ i += plus;
+ }
+ }
+ }
+ return 0xFFFF;
+}
+
+/** Find occurrence of substr with length substr_len in pbuf p, start at offset
+ * start_offset
+ * WARNING: in contrast to strstr(), this one does not stop at the first \0 in
+ * the pbuf/source string!
+ *
+ * @param p pbuf to search, maximum length is 0xFFFE since 0xFFFF is used as
+ * return value 'not found'
+ * @param substr string to search for in p, maximum length is 0xFFFE
+ * @return 0xFFFF if substr was not found in p or the index where it was found
+ */
+u16_t
+pbuf_strstr(struct pbuf* p, const char* substr)
+{
+ size_t substr_len;
+ if ((substr == NULL) || (substr[0] == 0) || (p->tot_len == 0xFFFF)) {
+ return 0xFFFF;
+ }
+ substr_len = strlen(substr);
+ if (substr_len >= 0xFFFF) {
+ return 0xFFFF;
+ }
+ return pbuf_memfind(p, substr, (u16_t)substr_len, 0);
+}
--- /dev/null
+/**
+ * @file
+ * Implementation of raw protocol PCBs for low-level handling of
+ * different types of protocols besides (or overriding) those
+ * already available in lwIP.
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_RAW /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/def.h"
+#include "lwip/memp.h"
+#include "lwip/ip_addr.h"
+#include "lwip/netif.h"
+#include "lwip/raw.h"
+#include "lwip/stats.h"
+#include "arch/perf.h"
+
+#include <string.h>
+
+/** The list of RAW PCBs */
+static struct raw_pcb *raw_pcbs;
+
+/**
+ * Determine if in incoming IP packet is covered by a RAW PCB
+ * and if so, pass it to a user-provided receive callback function.
+ *
+ * Given an incoming IP datagram (as a chain of pbufs) this function
+ * finds a corresponding RAW PCB and calls the corresponding receive
+ * callback function.
+ *
+ * @param p pbuf to be demultiplexed to a RAW PCB.
+ * @param inp network interface on which the datagram was received.
+ * @return - 1 if the packet has been eaten by a RAW PCB receive
+ * callback function. The caller MAY NOT not reference the
+ * packet any longer, and MAY NOT call pbuf_free().
+ * @return - 0 if packet is not eaten (pbuf is still referenced by the
+ * caller).
+ *
+ */
+u8_t
+raw_input(struct pbuf *p, struct netif *inp)
+{
+ struct raw_pcb *pcb, *prev;
+ struct ip_hdr *iphdr;
+ s16_t proto;
+ u8_t eaten = 0;
+
+ LWIP_UNUSED_ARG(inp);
+
+ iphdr = (struct ip_hdr *)p->payload;
+ proto = IPH_PROTO(iphdr);
+
+ prev = NULL;
+ pcb = raw_pcbs;
+ /* loop through all raw pcbs until the packet is eaten by one */
+ /* this allows multiple pcbs to match against the packet by design */
+ while ((eaten == 0) && (pcb != NULL)) {
+ if ((pcb->protocol == proto) &&
+ (ip_addr_isany(&pcb->local_ip) ||
+ ip_addr_cmp(&(pcb->local_ip), ¤t_iphdr_dest))) {
+#if IP_SOF_BROADCAST_RECV
+ /* broadcast filter? */
+ if ((pcb->so_options & SOF_BROADCAST) || !ip_addr_isbroadcast(¤t_iphdr_dest, inp))
+#endif /* IP_SOF_BROADCAST_RECV */
+ {
+ /* receive callback function available? */
+ if (pcb->recv != NULL) {
+ /* the receive callback function did not eat the packet? */
+ if (pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr()) != 0) {
+ /* receive function ate the packet */
+ p = NULL;
+ eaten = 1;
+ if (prev != NULL) {
+ /* move the pcb to the front of raw_pcbs so that is
+ found faster next time */
+ prev->next = pcb->next;
+ pcb->next = raw_pcbs;
+ raw_pcbs = pcb;
+ }
+ }
+ }
+ /* no receive callback function was set for this raw PCB */
+ }
+ /* drop the packet */
+ }
+ prev = pcb;
+ pcb = pcb->next;
+ }
+ return eaten;
+}
+
+/**
+ * Bind a RAW PCB.
+ *
+ * @param pcb RAW PCB to be bound with a local address ipaddr.
+ * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
+ * bind to all local interfaces.
+ *
+ * @return lwIP error code.
+ * - ERR_OK. Successful. No error occured.
+ * - ERR_USE. The specified IP address is already bound to by
+ * another RAW PCB.
+ *
+ * @see raw_disconnect()
+ */
+err_t
+raw_bind(struct raw_pcb *pcb, ip_addr_t *ipaddr)
+{
+ ip_addr_set(&pcb->local_ip, ipaddr);
+ return ERR_OK;
+}
+
+/**
+ * Connect an RAW PCB. This function is required by upper layers
+ * of lwip. Using the raw api you could use raw_sendto() instead
+ *
+ * This will associate the RAW PCB with the remote address.
+ *
+ * @param pcb RAW PCB to be connected with remote address ipaddr and port.
+ * @param ipaddr remote IP address to connect with.
+ *
+ * @return lwIP error code
+ *
+ * @see raw_disconnect() and raw_sendto()
+ */
+err_t
+raw_connect(struct raw_pcb *pcb, ip_addr_t *ipaddr)
+{
+ ip_addr_set(&pcb->remote_ip, ipaddr);
+ return ERR_OK;
+}
+
+
+/**
+ * Set the callback function for received packets that match the
+ * raw PCB's protocol and binding.
+ *
+ * The callback function MUST either
+ * - eat the packet by calling pbuf_free() and returning non-zero. The
+ * packet will not be passed to other raw PCBs or other protocol layers.
+ * - not free the packet, and return zero. The packet will be matched
+ * against further PCBs and/or forwarded to another protocol layers.
+ *
+ * @return non-zero if the packet was free()d, zero if the packet remains
+ * available for others.
+ */
+void
+raw_recv(struct raw_pcb *pcb, raw_recv_fn recv, void *recv_arg)
+{
+ /* remember recv() callback and user data */
+ pcb->recv = recv;
+ pcb->recv_arg = recv_arg;
+}
+
+/**
+ * Send the raw IP packet to the given address. Note that actually you cannot
+ * modify the IP headers (this is inconsistent with the receive callback where
+ * you actually get the IP headers), you can only specify the IP payload here.
+ * It requires some more changes in lwIP. (there will be a raw_send() function
+ * then.)
+ *
+ * @param pcb the raw pcb which to send
+ * @param p the IP payload to send
+ * @param ipaddr the destination address of the IP packet
+ *
+ */
+err_t
+raw_sendto(struct raw_pcb *pcb, struct pbuf *p, ip_addr_t *ipaddr)
+{
+ err_t err;
+ struct netif *netif;
+ ip_addr_t *src_ip;
+ struct pbuf *q; /* q will be sent down the stack */
+
+ LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE, ("raw_sendto\n"));
+
+ /* not enough space to add an IP header to first pbuf in given p chain? */
+ if (pbuf_header(p, IP_HLEN)) {
+ /* allocate header in new pbuf */
+ q = pbuf_alloc(PBUF_IP, 0, PBUF_RAM);
+ /* new header pbuf could not be allocated? */
+ if (q == NULL) {
+ LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("raw_sendto: could not allocate header\n"));
+ return ERR_MEM;
+ }
+ if (p->tot_len != 0) {
+ /* chain header q in front of given pbuf p */
+ pbuf_chain(q, p);
+ }
+ /* { first pbuf q points to header pbuf } */
+ LWIP_DEBUGF(RAW_DEBUG, ("raw_sendto: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
+ } else {
+ /* first pbuf q equals given pbuf */
+ q = p;
+ if(pbuf_header(q, -IP_HLEN)) {
+ LWIP_ASSERT("Can't restore header we just removed!", 0);
+ return ERR_MEM;
+ }
+ }
+
+ if ((netif = ip_route(ipaddr)) == NULL) {
+ LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_LEVEL_WARNING, ("raw_sendto: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
+ /* free any temporary header pbuf allocated by pbuf_header() */
+ if (q != p) {
+ pbuf_free(q);
+ }
+ return ERR_RTE;
+ }
+
+#if IP_SOF_BROADCAST
+ /* broadcast filter? */
+ if (((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(ipaddr, netif)) {
+ LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_LEVEL_WARNING, ("raw_sendto: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
+ /* free any temporary header pbuf allocated by pbuf_header() */
+ if (q != p) {
+ pbuf_free(q);
+ }
+ return ERR_VAL;
+ }
+#endif /* IP_SOF_BROADCAST */
+
+ if (ip_addr_isany(&pcb->local_ip)) {
+ /* use outgoing network interface IP address as source address */
+ src_ip = &(netif->ip_addr);
+ } else {
+ /* use RAW PCB local IP address as source address */
+ src_ip = &(pcb->local_ip);
+ }
+
+#if LWIP_NETIF_HWADDRHINT
+ netif->addr_hint = &(pcb->addr_hint);
+#endif /* LWIP_NETIF_HWADDRHINT*/
+ err = ip_output_if (q, src_ip, ipaddr, pcb->ttl, pcb->tos, pcb->protocol, netif);
+#if LWIP_NETIF_HWADDRHINT
+ netif->addr_hint = NULL;
+#endif /* LWIP_NETIF_HWADDRHINT*/
+
+ /* did we chain a header earlier? */
+ if (q != p) {
+ /* free the header */
+ pbuf_free(q);
+ }
+ return err;
+}
+
+/**
+ * Send the raw IP packet to the address given by raw_connect()
+ *
+ * @param pcb the raw pcb which to send
+ * @param p the IP payload to send
+ *
+ */
+err_t
+raw_send(struct raw_pcb *pcb, struct pbuf *p)
+{
+ return raw_sendto(pcb, p, &pcb->remote_ip);
+}
+
+/**
+ * Remove an RAW PCB.
+ *
+ * @param pcb RAW PCB to be removed. The PCB is removed from the list of
+ * RAW PCB's and the data structure is freed from memory.
+ *
+ * @see raw_new()
+ */
+void
+raw_remove(struct raw_pcb *pcb)
+{
+ struct raw_pcb *pcb2;
+ /* pcb to be removed is first in list? */
+ if (raw_pcbs == pcb) {
+ /* make list start at 2nd pcb */
+ raw_pcbs = raw_pcbs->next;
+ /* pcb not 1st in list */
+ } else {
+ for(pcb2 = raw_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
+ /* find pcb in raw_pcbs list */
+ if (pcb2->next != NULL && pcb2->next == pcb) {
+ /* remove pcb from list */
+ pcb2->next = pcb->next;
+ }
+ }
+ }
+ memp_free(MEMP_RAW_PCB, pcb);
+}
+
+/**
+ * Create a RAW PCB.
+ *
+ * @return The RAW PCB which was created. NULL if the PCB data structure
+ * could not be allocated.
+ *
+ * @param proto the protocol number of the IPs payload (e.g. IP_PROTO_ICMP)
+ *
+ * @see raw_remove()
+ */
+struct raw_pcb *
+raw_new(u8_t proto)
+{
+ struct raw_pcb *pcb;
+
+ LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE, ("raw_new\n"));
+
+ pcb = (struct raw_pcb *)memp_malloc(MEMP_RAW_PCB);
+ /* could allocate RAW PCB? */
+ if (pcb != NULL) {
+ /* initialize PCB to all zeroes */
+ memset(pcb, 0, sizeof(struct raw_pcb));
+ pcb->protocol = proto;
+ pcb->ttl = RAW_TTL;
+ pcb->next = raw_pcbs;
+ raw_pcbs = pcb;
+ }
+ return pcb;
+}
+
+#endif /* LWIP_RAW */
--- /dev/null
+/**
+ * @file
+ * Statistics module
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_STATS /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/def.h"
+#include "lwip/stats.h"
+#include "lwip/mem.h"
+
+#include <string.h>
+
+struct stats_ lwip_stats;
+
+void stats_init(void)
+{
+#ifdef LWIP_DEBUG
+#if MEMP_STATS
+ const char * memp_names[] = {
+#define LWIP_MEMPOOL(name,num,size,desc) desc,
+#include "lwip/memp_std.h"
+ };
+ int i;
+ for (i = 0; i < MEMP_MAX; i++) {
+ lwip_stats.memp[i].name = memp_names[i];
+ }
+#endif /* MEMP_STATS */
+#if MEM_STATS
+ lwip_stats.mem.name = "MEM";
+#endif /* MEM_STATS */
+#endif /* LWIP_DEBUG */
+}
+
+#if LWIP_STATS_DISPLAY
+void
+stats_display_proto(struct stats_proto *proto, char *name)
+{
+ LWIP_PLATFORM_DIAG(("\n%s\n\t", name));
+ LWIP_PLATFORM_DIAG(("xmit: %"STAT_COUNTER_F"\n\t", proto->xmit));
+ LWIP_PLATFORM_DIAG(("recv: %"STAT_COUNTER_F"\n\t", proto->recv));
+ LWIP_PLATFORM_DIAG(("fw: %"STAT_COUNTER_F"\n\t", proto->fw));
+ LWIP_PLATFORM_DIAG(("drop: %"STAT_COUNTER_F"\n\t", proto->drop));
+ LWIP_PLATFORM_DIAG(("chkerr: %"STAT_COUNTER_F"\n\t", proto->chkerr));
+ LWIP_PLATFORM_DIAG(("lenerr: %"STAT_COUNTER_F"\n\t", proto->lenerr));
+ LWIP_PLATFORM_DIAG(("memerr: %"STAT_COUNTER_F"\n\t", proto->memerr));
+ LWIP_PLATFORM_DIAG(("rterr: %"STAT_COUNTER_F"\n\t", proto->rterr));
+ LWIP_PLATFORM_DIAG(("proterr: %"STAT_COUNTER_F"\n\t", proto->proterr));
+ LWIP_PLATFORM_DIAG(("opterr: %"STAT_COUNTER_F"\n\t", proto->opterr));
+ LWIP_PLATFORM_DIAG(("err: %"STAT_COUNTER_F"\n\t", proto->err));
+ LWIP_PLATFORM_DIAG(("cachehit: %"STAT_COUNTER_F"\n", proto->cachehit));
+}
+
+#if IGMP_STATS
+void
+stats_display_igmp(struct stats_igmp *igmp)
+{
+ LWIP_PLATFORM_DIAG(("\nIGMP\n\t"));
+ LWIP_PLATFORM_DIAG(("xmit: %"STAT_COUNTER_F"\n\t", igmp->xmit));
+ LWIP_PLATFORM_DIAG(("recv: %"STAT_COUNTER_F"\n\t", igmp->recv));
+ LWIP_PLATFORM_DIAG(("drop: %"STAT_COUNTER_F"\n\t", igmp->drop));
+ LWIP_PLATFORM_DIAG(("chkerr: %"STAT_COUNTER_F"\n\t", igmp->chkerr));
+ LWIP_PLATFORM_DIAG(("lenerr: %"STAT_COUNTER_F"\n\t", igmp->lenerr));
+ LWIP_PLATFORM_DIAG(("memerr: %"STAT_COUNTER_F"\n\t", igmp->memerr));
+ LWIP_PLATFORM_DIAG(("proterr: %"STAT_COUNTER_F"\n\t", igmp->proterr));
+ LWIP_PLATFORM_DIAG(("rx_v1: %"STAT_COUNTER_F"\n\t", igmp->rx_v1));
+ LWIP_PLATFORM_DIAG(("rx_group: %"STAT_COUNTER_F"\n", igmp->rx_group));
+ LWIP_PLATFORM_DIAG(("rx_general: %"STAT_COUNTER_F"\n", igmp->rx_general));
+ LWIP_PLATFORM_DIAG(("rx_report: %"STAT_COUNTER_F"\n\t", igmp->rx_report));
+ LWIP_PLATFORM_DIAG(("tx_join: %"STAT_COUNTER_F"\n\t", igmp->tx_join));
+ LWIP_PLATFORM_DIAG(("tx_leave: %"STAT_COUNTER_F"\n\t", igmp->tx_leave));
+ LWIP_PLATFORM_DIAG(("tx_report: %"STAT_COUNTER_F"\n\t", igmp->tx_report));
+}
+#endif /* IGMP_STATS */
+
+#if MEM_STATS || MEMP_STATS
+void
+stats_display_mem(struct stats_mem *mem, char *name)
+{
+ LWIP_PLATFORM_DIAG(("\nMEM %s\n\t", name));
+ LWIP_PLATFORM_DIAG(("avail: %"U32_F"\n\t", (u32_t)mem->avail));
+ LWIP_PLATFORM_DIAG(("used: %"U32_F"\n\t", (u32_t)mem->used));
+ LWIP_PLATFORM_DIAG(("max: %"U32_F"\n\t", (u32_t)mem->max));
+ LWIP_PLATFORM_DIAG(("err: %"U32_F"\n", (u32_t)mem->err));
+}
+
+#if MEMP_STATS
+void
+stats_display_memp(struct stats_mem *mem, int index)
+{
+ char * memp_names[] = {
+#define LWIP_MEMPOOL(name,num,size,desc) desc,
+#include "lwip/memp_std.h"
+ };
+ if(index < MEMP_MAX) {
+ stats_display_mem(mem, memp_names[index]);
+ }
+}
+#endif /* MEMP_STATS */
+#endif /* MEM_STATS || MEMP_STATS */
+
+#if SYS_STATS
+void
+stats_display_sys(struct stats_sys *sys)
+{
+ LWIP_PLATFORM_DIAG(("\nSYS\n\t"));
+ LWIP_PLATFORM_DIAG(("sem.used: %"U32_F"\n\t", (u32_t)sys->sem.used));
+ LWIP_PLATFORM_DIAG(("sem.max: %"U32_F"\n\t", (u32_t)sys->sem.max));
+ LWIP_PLATFORM_DIAG(("sem.err: %"U32_F"\n\t", (u32_t)sys->sem.err));
+ LWIP_PLATFORM_DIAG(("mutex.used: %"U32_F"\n\t", (u32_t)sys->mutex.used));
+ LWIP_PLATFORM_DIAG(("mutex.max: %"U32_F"\n\t", (u32_t)sys->mutex.max));
+ LWIP_PLATFORM_DIAG(("mutex.err: %"U32_F"\n\t", (u32_t)sys->mutex.err));
+ LWIP_PLATFORM_DIAG(("mbox.used: %"U32_F"\n\t", (u32_t)sys->mbox.used));
+ LWIP_PLATFORM_DIAG(("mbox.max: %"U32_F"\n\t", (u32_t)sys->mbox.max));
+ LWIP_PLATFORM_DIAG(("mbox.err: %"U32_F"\n\t", (u32_t)sys->mbox.err));
+}
+#endif /* SYS_STATS */
+
+void
+stats_display(void)
+{
+ s16_t i;
+
+ LINK_STATS_DISPLAY();
+ ETHARP_STATS_DISPLAY();
+ IPFRAG_STATS_DISPLAY();
+ IP_STATS_DISPLAY();
+ IGMP_STATS_DISPLAY();
+ ICMP_STATS_DISPLAY();
+ UDP_STATS_DISPLAY();
+ TCP_STATS_DISPLAY();
+ MEM_STATS_DISPLAY();
+ for (i = 0; i < MEMP_MAX; i++) {
+ MEMP_STATS_DISPLAY(i);
+ }
+ SYS_STATS_DISPLAY();
+}
+#endif /* LWIP_STATS_DISPLAY */
+
+#endif /* LWIP_STATS */
+
--- /dev/null
+/**
+ * @file
+ * lwIP Operating System abstraction
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/sys.h"
+
+/* Most of the functions defined in sys.h must be implemented in the
+ * architecture-dependent file sys_arch.c */
+
+#if !NO_SYS
+
+/**
+ * Sleep for some ms. Timeouts are NOT processed while sleeping.
+ *
+ * @param ms number of milliseconds to sleep
+ */
+void
+sys_msleep(u32_t ms)
+{
+ if (ms > 0) {
+ sys_sem_t delaysem;
+ err_t err = sys_sem_new(&delaysem, 0);
+ if (err == ERR_OK) {
+ sys_arch_sem_wait(&delaysem, ms);
+ sys_sem_free(&delaysem);
+ }
+ }
+}
+
+#endif /* !NO_SYS */
--- /dev/null
+/**
+ * @file
+ * Transmission Control Protocol for IP
+ *
+ * This file contains common functions for the TCP implementation, such as functinos
+ * for manipulating the data structures and the TCP timer functions. TCP functions
+ * related to input and output is found in tcp_in.c and tcp_out.c respectively.
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/def.h"
+#include "lwip/mem.h"
+#include "lwip/memp.h"
+#include "lwip/snmp.h"
+#include "lwip/tcp.h"
+#include "lwip/tcp_impl.h"
+#include "lwip/debug.h"
+#include "lwip/stats.h"
+
+#include <string.h>
+
+const char * const tcp_state_str[] = {
+ "CLOSED",
+ "LISTEN",
+ "SYN_SENT",
+ "SYN_RCVD",
+ "ESTABLISHED",
+ "FIN_WAIT_1",
+ "FIN_WAIT_2",
+ "CLOSE_WAIT",
+ "CLOSING",
+ "LAST_ACK",
+ "TIME_WAIT"
+};
+
+/* Incremented every coarse grained timer shot (typically every 500 ms). */
+u32_t tcp_ticks;
+const u8_t tcp_backoff[13] =
+ { 1, 2, 3, 4, 5, 6, 7, 7, 7, 7, 7, 7, 7};
+ /* Times per slowtmr hits */
+const u8_t tcp_persist_backoff[7] = { 3, 6, 12, 24, 48, 96, 120 };
+
+/* The TCP PCB lists. */
+
+/** List of all TCP PCBs bound but not yet (connected || listening) */
+struct tcp_pcb *tcp_bound_pcbs;
+/** List of all TCP PCBs in LISTEN state */
+union tcp_listen_pcbs_t tcp_listen_pcbs;
+/** List of all TCP PCBs that are in a state in which
+ * they accept or send data. */
+struct tcp_pcb *tcp_active_pcbs;
+/** List of all TCP PCBs in TIME-WAIT state */
+struct tcp_pcb *tcp_tw_pcbs;
+
+#define NUM_TCP_PCB_LISTS 4
+#define NUM_TCP_PCB_LISTS_NO_TIME_WAIT 3
+/** An array with all (non-temporary) PCB lists, mainly used for smaller code size */
+struct tcp_pcb ** const tcp_pcb_lists[] = {&tcp_listen_pcbs.pcbs, &tcp_bound_pcbs,
+ &tcp_active_pcbs, &tcp_tw_pcbs};
+
+/** Only used for temporary storage. */
+struct tcp_pcb *tcp_tmp_pcb;
+
+/** Timer counter to handle calling slow-timer from tcp_tmr() */
+static u8_t tcp_timer;
+static u16_t tcp_new_port(void);
+
+/**
+ * Called periodically to dispatch TCP timers.
+ *
+ */
+void
+tcp_tmr(void)
+{
+ /* Call tcp_fasttmr() every 250 ms */
+ tcp_fasttmr();
+
+ if (++tcp_timer & 1) {
+ /* Call tcp_tmr() every 500 ms, i.e., every other timer
+ tcp_tmr() is called. */
+ tcp_slowtmr();
+ }
+}
+
+/**
+ * Closes the TX side of a connection held by the PCB.
+ * For tcp_close(), a RST is sent if the application didn't receive all data
+ * (tcp_recved() not called for all data passed to recv callback).
+ *
+ * Listening pcbs are freed and may not be referenced any more.
+ * Connection pcbs are freed if not yet connected and may not be referenced
+ * any more. If a connection is established (at least SYN received or in
+ * a closing state), the connection is closed, and put in a closing state.
+ * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
+ * unsafe to reference it.
+ *
+ * @param pcb the tcp_pcb to close
+ * @return ERR_OK if connection has been closed
+ * another err_t if closing failed and pcb is not freed
+ */
+static err_t
+tcp_close_shutdown(struct tcp_pcb *pcb, u8_t rst_on_unacked_data)
+{
+ err_t err;
+
+ if (rst_on_unacked_data && (pcb->state != LISTEN)) {
+ if ((pcb->refused_data != NULL) || (pcb->rcv_wnd != TCP_WND)) {
+ /* Not all data received by application, send RST to tell the remote
+ side about this. */
+ LWIP_ASSERT("pcb->flags & TF_RXCLOSED", pcb->flags & TF_RXCLOSED);
+
+ /* don't call tcp_abort here: we must not deallocate the pcb since
+ that might not be expected when calling tcp_close */
+ tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
+ pcb->local_port, pcb->remote_port);
+
+ tcp_pcb_purge(pcb);
+
+ /* TODO: to which state do we move now? */
+
+ /* move to TIME_WAIT since we close actively */
+ TCP_RMV(&tcp_active_pcbs, pcb);
+ pcb->state = TIME_WAIT;
+ TCP_REG(&tcp_tw_pcbs, pcb);
+
+ return ERR_OK;
+ }
+ }
+
+ switch (pcb->state) {
+ case CLOSED:
+ /* Closing a pcb in the CLOSED state might seem erroneous,
+ * however, it is in this state once allocated and as yet unused
+ * and the user needs some way to free it should the need arise.
+ * Calling tcp_close() with a pcb that has already been closed, (i.e. twice)
+ * or for a pcb that has been used and then entered the CLOSED state
+ * is erroneous, but this should never happen as the pcb has in those cases
+ * been freed, and so any remaining handles are bogus. */
+ err = ERR_OK;
+ if (pcb->local_port != 0) {
+ TCP_RMV(&tcp_bound_pcbs, pcb);
+ }
+ memp_free(MEMP_TCP_PCB, pcb);
+ pcb = NULL;
+ break;
+ case LISTEN:
+ err = ERR_OK;
+ tcp_pcb_remove(&tcp_listen_pcbs.pcbs, pcb);
+ memp_free(MEMP_TCP_PCB_LISTEN, pcb);
+ pcb = NULL;
+ break;
+ case SYN_SENT:
+ err = ERR_OK;
+ tcp_pcb_remove(&tcp_active_pcbs, pcb);
+ memp_free(MEMP_TCP_PCB, pcb);
+ pcb = NULL;
+ snmp_inc_tcpattemptfails();
+ break;
+ case SYN_RCVD:
+ err = tcp_send_fin(pcb);
+ if (err == ERR_OK) {
+ snmp_inc_tcpattemptfails();
+ pcb->state = FIN_WAIT_1;
+ }
+ break;
+ case ESTABLISHED:
+ err = tcp_send_fin(pcb);
+ if (err == ERR_OK) {
+ snmp_inc_tcpestabresets();
+ pcb->state = FIN_WAIT_1;
+ }
+ break;
+ case CLOSE_WAIT:
+ err = tcp_send_fin(pcb);
+ if (err == ERR_OK) {
+ snmp_inc_tcpestabresets();
+ pcb->state = LAST_ACK;
+ }
+ break;
+ default:
+ /* Has already been closed, do nothing. */
+ err = ERR_OK;
+ pcb = NULL;
+ break;
+ }
+
+ if (pcb != NULL && err == ERR_OK) {
+ /* To ensure all data has been sent when tcp_close returns, we have
+ to make sure tcp_output doesn't fail.
+ Since we don't really have to ensure all data has been sent when tcp_close
+ returns (unsent data is sent from tcp timer functions, also), we don't care
+ for the return value of tcp_output for now. */
+ /* @todo: When implementing SO_LINGER, this must be changed somehow:
+ If SOF_LINGER is set, the data should be sent and acked before close returns.
+ This can only be valid for sequential APIs, not for the raw API. */
+ tcp_output(pcb);
+ }
+ return err;
+}
+
+/**
+ * Closes the connection held by the PCB.
+ *
+ * Listening pcbs are freed and may not be referenced any more.
+ * Connection pcbs are freed if not yet connected and may not be referenced
+ * any more. If a connection is established (at least SYN received or in
+ * a closing state), the connection is closed, and put in a closing state.
+ * The pcb is then automatically freed in tcp_slowtmr(). It is therefore
+ * unsafe to reference it (unless an error is returned).
+ *
+ * @param pcb the tcp_pcb to close
+ * @return ERR_OK if connection has been closed
+ * another err_t if closing failed and pcb is not freed
+ */
+err_t
+tcp_close(struct tcp_pcb *pcb)
+{
+#if TCP_DEBUG
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_close: closing in "));
+ tcp_debug_print_state(pcb->state);
+#endif /* TCP_DEBUG */
+
+ if (pcb->state != LISTEN) {
+ /* Set a flag not to receive any more data... */
+ pcb->flags |= TF_RXCLOSED;
+ }
+ /* ... and close */
+ return tcp_close_shutdown(pcb, 1);
+}
+
+/**
+ * Causes all or part of a full-duplex connection of this PCB to be shut down.
+ * This doesn't deallocate the PCB!
+ *
+ * @param pcb PCB to shutdown
+ * @param shut_rx shut down receive side if this is != 0
+ * @param shut_tx shut down send side if this is != 0
+ * @return ERR_OK if shutdown succeeded (or the PCB has already been shut down)
+ * another err_t on error.
+ */
+err_t
+tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx)
+{
+ if (pcb->state == LISTEN) {
+ return ERR_CONN;
+ }
+ if (shut_rx) {
+ /* shut down the receive side: free buffered data... */
+ if (pcb->refused_data != NULL) {
+ pbuf_free(pcb->refused_data);
+ pcb->refused_data = NULL;
+ }
+ /* ... and set a flag not to receive any more data */
+ pcb->flags |= TF_RXCLOSED;
+ }
+ if (shut_tx) {
+ /* This can't happen twice since if it succeeds, the pcb's state is changed.
+ Only close in these states as the others directly deallocate the PCB */
+ switch (pcb->state) {
+ case SYN_RCVD:
+ case ESTABLISHED:
+ case CLOSE_WAIT:
+ return tcp_close_shutdown(pcb, 0);
+ default:
+ /* don't shut down other states */
+ break;
+ }
+ }
+ /* @todo: return another err_t if not in correct state or already shut? */
+ return ERR_OK;
+}
+
+/**
+ * Abandons a connection and optionally sends a RST to the remote
+ * host. Deletes the local protocol control block. This is done when
+ * a connection is killed because of shortage of memory.
+ *
+ * @param pcb the tcp_pcb to abort
+ * @param reset boolean to indicate whether a reset should be sent
+ */
+void
+tcp_abandon(struct tcp_pcb *pcb, int reset)
+{
+ u32_t seqno, ackno;
+ u16_t remote_port, local_port;
+ ip_addr_t remote_ip, local_ip;
+#if LWIP_CALLBACK_API
+ tcp_err_fn errf;
+#endif /* LWIP_CALLBACK_API */
+ void *errf_arg;
+
+ /* pcb->state LISTEN not allowed here */
+ LWIP_ASSERT("don't call tcp_abort/tcp_abandon for listen-pcbs",
+ pcb->state != LISTEN);
+ /* Figure out on which TCP PCB list we are, and remove us. If we
+ are in an active state, call the receive function associated with
+ the PCB with a NULL argument, and send an RST to the remote end. */
+ if (pcb->state == TIME_WAIT) {
+ tcp_pcb_remove(&tcp_tw_pcbs, pcb);
+ memp_free(MEMP_TCP_PCB, pcb);
+ } else {
+ seqno = pcb->snd_nxt;
+ ackno = pcb->rcv_nxt;
+ ip_addr_copy(local_ip, pcb->local_ip);
+ ip_addr_copy(remote_ip, pcb->remote_ip);
+ local_port = pcb->local_port;
+ remote_port = pcb->remote_port;
+#if LWIP_CALLBACK_API
+ errf = pcb->errf;
+#endif /* LWIP_CALLBACK_API */
+ errf_arg = pcb->callback_arg;
+ tcp_pcb_remove(&tcp_active_pcbs, pcb);
+ if (pcb->unacked != NULL) {
+ tcp_segs_free(pcb->unacked);
+ }
+ if (pcb->unsent != NULL) {
+ tcp_segs_free(pcb->unsent);
+ }
+#if TCP_QUEUE_OOSEQ
+ if (pcb->ooseq != NULL) {
+ tcp_segs_free(pcb->ooseq);
+ }
+#endif /* TCP_QUEUE_OOSEQ */
+ memp_free(MEMP_TCP_PCB, pcb);
+ TCP_EVENT_ERR(errf, errf_arg, ERR_ABRT);
+ if (reset) {
+ LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_abandon: sending RST\n"));
+ tcp_rst(seqno, ackno, &local_ip, &remote_ip, local_port, remote_port);
+ }
+ }
+}
+
+/**
+ * Aborts the connection by sending a RST (reset) segment to the remote
+ * host. The pcb is deallocated. This function never fails.
+ *
+ * ATTENTION: When calling this from one of the TCP callbacks, make
+ * sure you always return ERR_ABRT (and never return ERR_ABRT otherwise
+ * or you will risk accessing deallocated memory or memory leaks!
+ *
+ * @param pcb the tcp pcb to abort
+ */
+void
+tcp_abort(struct tcp_pcb *pcb)
+{
+ tcp_abandon(pcb, 1);
+}
+
+/**
+ * Binds the connection to a local portnumber and IP address. If the
+ * IP address is not given (i.e., ipaddr == NULL), the IP address of
+ * the outgoing network interface is used instead.
+ *
+ * @param pcb the tcp_pcb to bind (no check is done whether this pcb is
+ * already bound!)
+ * @param ipaddr the local ip address to bind to (use IP_ADDR_ANY to bind
+ * to any local address
+ * @param port the local port to bind to
+ * @return ERR_USE if the port is already in use
+ * ERR_VAL if bind failed because the PCB is not in a valid state
+ * ERR_OK if bound
+ */
+err_t
+tcp_bind(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
+{
+ int i;
+ int max_pcb_list = NUM_TCP_PCB_LISTS;
+ struct tcp_pcb *cpcb;
+
+ LWIP_ERROR("tcp_bind: can only bind in state CLOSED", pcb->state == CLOSED, return ERR_VAL);
+
+#if SO_REUSE
+ /* Unless the REUSEADDR flag is set,
+ we have to check the pcbs in TIME-WAIT state, also.
+ We do not dump TIME_WAIT pcb's; they can still be matched by incoming
+ packets using both local and remote IP addresses and ports to distinguish.
+ */
+ if ((pcb->so_options & SOF_REUSEADDR) != 0) {
+ max_pcb_list = NUM_TCP_PCB_LISTS_NO_TIME_WAIT;
+ }
+#endif /* SO_REUSE */
+
+ if (port == 0) {
+ port = tcp_new_port();
+ }
+
+ /* Check if the address already is in use (on all lists) */
+ for (i = 0; i < max_pcb_list; i++) {
+ for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
+ if (cpcb->local_port == port) {
+#if SO_REUSE
+ /* Omit checking for the same port if both pcbs have REUSEADDR set.
+ For SO_REUSEADDR, the duplicate-check for a 5-tuple is done in
+ tcp_connect. */
+ if (((pcb->so_options & SOF_REUSEADDR) == 0) ||
+ ((cpcb->so_options & SOF_REUSEADDR) == 0))
+#endif /* SO_REUSE */
+ {
+ if (ip_addr_isany(&(cpcb->local_ip)) ||
+ ip_addr_isany(ipaddr) ||
+ ip_addr_cmp(&(cpcb->local_ip), ipaddr)) {
+ return ERR_USE;
+ }
+ }
+ }
+ }
+ }
+
+ if (!ip_addr_isany(ipaddr)) {
+ pcb->local_ip = *ipaddr;
+ }
+ pcb->local_port = port;
+ TCP_REG(&tcp_bound_pcbs, pcb);
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_bind: bind to port %"U16_F"\n", port));
+ return ERR_OK;
+}
+#if LWIP_CALLBACK_API
+/**
+ * Default accept callback if no accept callback is specified by the user.
+ */
+static err_t
+tcp_accept_null(void *arg, struct tcp_pcb *pcb, err_t err)
+{
+ LWIP_UNUSED_ARG(arg);
+ LWIP_UNUSED_ARG(pcb);
+ LWIP_UNUSED_ARG(err);
+
+ return ERR_ABRT;
+}
+#endif /* LWIP_CALLBACK_API */
+
+/**
+ * Set the state of the connection to be LISTEN, which means that it
+ * is able to accept incoming connections. The protocol control block
+ * is reallocated in order to consume less memory. Setting the
+ * connection to LISTEN is an irreversible process.
+ *
+ * @param pcb the original tcp_pcb
+ * @param backlog the incoming connections queue limit
+ * @return tcp_pcb used for listening, consumes less memory.
+ *
+ * @note The original tcp_pcb is freed. This function therefore has to be
+ * called like this:
+ * tpcb = tcp_listen(tpcb);
+ */
+struct tcp_pcb *
+tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
+{
+ struct tcp_pcb_listen *lpcb;
+
+ LWIP_UNUSED_ARG(backlog);
+ LWIP_ERROR("tcp_listen: pcb already connected", pcb->state == CLOSED, return NULL);
+
+ /* already listening? */
+ if (pcb->state == LISTEN) {
+ return pcb;
+ }
+#if SO_REUSE
+ if ((pcb->so_options & SOF_REUSEADDR) != 0) {
+ /* Since SOF_REUSEADDR allows reusing a local address before the pcb's usage
+ is declared (listen-/connection-pcb), we have to make sure now that
+ this port is only used once for every local IP. */
+ for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
+ if (lpcb->local_port == pcb->local_port) {
+ if (ip_addr_cmp(&lpcb->local_ip, &pcb->local_ip)) {
+ /* this address/port is already used */
+ return NULL;
+ }
+ }
+ }
+ }
+#endif /* SO_REUSE */
+ lpcb = (struct tcp_pcb_listen *)memp_malloc(MEMP_TCP_PCB_LISTEN);
+ if (lpcb == NULL) {
+ return NULL;
+ }
+ lpcb->callback_arg = pcb->callback_arg;
+ lpcb->local_port = pcb->local_port;
+ lpcb->state = LISTEN;
+ lpcb->prio = pcb->prio;
+ lpcb->so_options = pcb->so_options;
+ lpcb->so_options |= SOF_ACCEPTCONN;
+ lpcb->ttl = pcb->ttl;
+ lpcb->tos = pcb->tos;
+ ip_addr_copy(lpcb->local_ip, pcb->local_ip);
+ if (pcb->local_port != 0) {
+ TCP_RMV(&tcp_bound_pcbs, pcb);
+ }
+ memp_free(MEMP_TCP_PCB, pcb);
+#if LWIP_CALLBACK_API
+ lpcb->accept = tcp_accept_null;
+#endif /* LWIP_CALLBACK_API */
+#if TCP_LISTEN_BACKLOG
+ lpcb->accepts_pending = 0;
+ lpcb->backlog = (backlog ? backlog : 1);
+#endif /* TCP_LISTEN_BACKLOG */
+ TCP_REG(&tcp_listen_pcbs.pcbs, (struct tcp_pcb *)lpcb);
+ return (struct tcp_pcb *)lpcb;
+}
+
+/**
+ * Update the state that tracks the available window space to advertise.
+ *
+ * Returns how much extra window would be advertised if we sent an
+ * update now.
+ */
+u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb)
+{
+ u32_t new_right_edge = pcb->rcv_nxt + pcb->rcv_wnd;
+
+ if (TCP_SEQ_GEQ(new_right_edge, pcb->rcv_ann_right_edge + LWIP_MIN((TCP_WND / 2), pcb->mss))) {
+ /* we can advertise more window */
+ pcb->rcv_ann_wnd = pcb->rcv_wnd;
+ return new_right_edge - pcb->rcv_ann_right_edge;
+ } else {
+ if (TCP_SEQ_GT(pcb->rcv_nxt, pcb->rcv_ann_right_edge)) {
+ /* Can happen due to other end sending out of advertised window,
+ * but within actual available (but not yet advertised) window */
+ pcb->rcv_ann_wnd = 0;
+ } else {
+ /* keep the right edge of window constant */
+ u32_t new_rcv_ann_wnd = pcb->rcv_ann_right_edge - pcb->rcv_nxt;
+ LWIP_ASSERT("new_rcv_ann_wnd <= 0xffff", new_rcv_ann_wnd <= 0xffff);
+ pcb->rcv_ann_wnd = (u16_t)new_rcv_ann_wnd;
+ }
+ return 0;
+ }
+}
+
+/**
+ * This function should be called by the application when it has
+ * processed the data. The purpose is to advertise a larger window
+ * when the data has been processed.
+ *
+ * @param pcb the tcp_pcb for which data is read
+ * @param len the amount of bytes that have been read by the application
+ */
+void
+tcp_recved(struct tcp_pcb *pcb, u16_t len)
+{
+ int wnd_inflation;
+
+ LWIP_ASSERT("tcp_recved: len would wrap rcv_wnd\n",
+ len <= 0xffff - pcb->rcv_wnd );
+
+ pcb->rcv_wnd += len;
+ if (pcb->rcv_wnd > TCP_WND) {
+ pcb->rcv_wnd = TCP_WND;
+ }
+
+ wnd_inflation = tcp_update_rcv_ann_wnd(pcb);
+
+ /* If the change in the right edge of window is significant (default
+ * watermark is TCP_WND/4), then send an explicit update now.
+ * Otherwise wait for a packet to be sent in the normal course of
+ * events (or more window to be available later) */
+ if (wnd_inflation >= TCP_WND_UPDATE_THRESHOLD) {
+ tcp_ack_now(pcb);
+ tcp_output(pcb);
+ }
+
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_recved: recveived %"U16_F" bytes, wnd %"U16_F" (%"U16_F").\n",
+ len, pcb->rcv_wnd, TCP_WND - pcb->rcv_wnd));
+}
+
+/**
+ * A nastly hack featuring 'goto' statements that allocates a
+ * new TCP local port.
+ *
+ * @return a new (free) local TCP port number
+ */
+static u16_t
+tcp_new_port(void)
+{
+ int i;
+ struct tcp_pcb *pcb;
+#ifndef TCP_LOCAL_PORT_RANGE_START
+/* From http://www.iana.org/assignments/port-numbers:
+ "The Dynamic and/or Private Ports are those from 49152 through 65535" */
+#define TCP_LOCAL_PORT_RANGE_START 0xc000
+#define TCP_LOCAL_PORT_RANGE_END 0xffff
+#endif
+ static u16_t port = TCP_LOCAL_PORT_RANGE_START;
+
+ again:
+ if (port++ >= TCP_LOCAL_PORT_RANGE_END) {
+ port = TCP_LOCAL_PORT_RANGE_START;
+ }
+ /* Check all PCB lists. */
+ for (i = 0; i < NUM_TCP_PCB_LISTS; i++) {
+ for(pcb = *tcp_pcb_lists[i]; pcb != NULL; pcb = pcb->next) {
+ if (pcb->local_port == port) {
+ goto again;
+ }
+ }
+ }
+ return port;
+}
+
+/**
+ * Connects to another host. The function given as the "connected"
+ * argument will be called when the connection has been established.
+ *
+ * @param pcb the tcp_pcb used to establish the connection
+ * @param ipaddr the remote ip address to connect to
+ * @param port the remote tcp port to connect to
+ * @param connected callback function to call when connected (or on error)
+ * @return ERR_VAL if invalid arguments are given
+ * ERR_OK if connect request has been sent
+ * other err_t values if connect request couldn't be sent
+ */
+err_t
+tcp_connect(struct tcp_pcb *pcb, ip_addr_t *ipaddr, u16_t port,
+ tcp_connected_fn connected)
+{
+ err_t ret;
+ u32_t iss;
+ u16_t old_local_port;
+
+ LWIP_ERROR("tcp_connect: can only connect from state CLOSED", pcb->state == CLOSED, return ERR_ISCONN);
+
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_connect to port %"U16_F"\n", port));
+ if (ipaddr != NULL) {
+ pcb->remote_ip = *ipaddr;
+ } else {
+ return ERR_VAL;
+ }
+ pcb->remote_port = port;
+
+ /* check if we have a route to the remote host */
+ if (ip_addr_isany(&(pcb->local_ip))) {
+ /* no local IP address set, yet. */
+ struct netif *netif = ip_route(&(pcb->remote_ip));
+ if (netif == NULL) {
+ /* Don't even try to send a SYN packet if we have no route
+ since that will fail. */
+ return ERR_RTE;
+ }
+ /* Use the netif's IP address as local address. */
+ ip_addr_copy(pcb->local_ip, netif->ip_addr);
+ }
+
+ old_local_port = pcb->local_port;
+ if (pcb->local_port == 0) {
+ pcb->local_port = tcp_new_port();
+ }
+#if SO_REUSE
+ if ((pcb->so_options & SOF_REUSEADDR) != 0) {
+ /* Since SOF_REUSEADDR allows reusing a local address, we have to make sure
+ now that the 5-tuple is unique. */
+ struct tcp_pcb *cpcb;
+ int i;
+ /* Don't check listen- and bound-PCBs, check active- and TIME-WAIT PCBs. */
+ for (i = 2; i < NUM_TCP_PCB_LISTS; i++) {
+ for(cpcb = *tcp_pcb_lists[i]; cpcb != NULL; cpcb = cpcb->next) {
+ if ((cpcb->local_port == pcb->local_port) &&
+ (cpcb->remote_port == port) &&
+ ip_addr_cmp(&cpcb->local_ip, &pcb->local_ip) &&
+ ip_addr_cmp(&cpcb->remote_ip, ipaddr)) {
+ /* linux returns EISCONN here, but ERR_USE should be OK for us */
+ return ERR_USE;
+ }
+ }
+ }
+ }
+#endif /* SO_REUSE */
+ iss = tcp_next_iss();
+ pcb->rcv_nxt = 0;
+ pcb->snd_nxt = iss;
+ pcb->lastack = iss - 1;
+ pcb->snd_lbb = iss - 1;
+ pcb->rcv_wnd = TCP_WND;
+ pcb->rcv_ann_wnd = TCP_WND;
+ pcb->rcv_ann_right_edge = pcb->rcv_nxt;
+ pcb->snd_wnd = TCP_WND;
+ /* As initial send MSS, we use TCP_MSS but limit it to 536.
+ The send MSS is updated when an MSS option is received. */
+ pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
+#if TCP_CALCULATE_EFF_SEND_MSS
+ pcb->mss = tcp_eff_send_mss(pcb->mss, ipaddr);
+#endif /* TCP_CALCULATE_EFF_SEND_MSS */
+ pcb->cwnd = 1;
+ pcb->ssthresh = pcb->mss * 10;
+#if LWIP_CALLBACK_API
+ pcb->connected = connected;
+#else /* LWIP_CALLBACK_API */
+ LWIP_UNUSED_ARG(connected);
+#endif /* LWIP_CALLBACK_API */
+
+ /* Send a SYN together with the MSS option. */
+ ret = tcp_enqueue_flags(pcb, TCP_SYN);
+ if (ret == ERR_OK) {
+ /* SYN segment was enqueued, changed the pcbs state now */
+ pcb->state = SYN_SENT;
+ if (old_local_port != 0) {
+ TCP_RMV(&tcp_bound_pcbs, pcb);
+ }
+ TCP_REG(&tcp_active_pcbs, pcb);
+ snmp_inc_tcpactiveopens();
+
+ tcp_output(pcb);
+ }
+ return ret;
+}
+
+/**
+ * Called every 500 ms and implements the retransmission timer and the timer that
+ * removes PCBs that have been in TIME-WAIT for enough time. It also increments
+ * various timers such as the inactivity timer in each PCB.
+ *
+ * Automatically called from tcp_tmr().
+ */
+void
+tcp_slowtmr(void)
+{
+ struct tcp_pcb *pcb, *prev;
+ u16_t eff_wnd;
+ u8_t pcb_remove; /* flag if a PCB should be removed */
+ u8_t pcb_reset; /* flag if a RST should be sent when removing */
+ err_t err;
+
+ err = ERR_OK;
+
+ ++tcp_ticks;
+
+ /* Steps through all of the active PCBs. */
+ prev = NULL;
+ pcb = tcp_active_pcbs;
+ if (pcb == NULL) {
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: no active pcbs\n"));
+ }
+ while (pcb != NULL) {
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: processing active pcb\n"));
+ LWIP_ASSERT("tcp_slowtmr: active pcb->state != CLOSED\n", pcb->state != CLOSED);
+ LWIP_ASSERT("tcp_slowtmr: active pcb->state != LISTEN\n", pcb->state != LISTEN);
+ LWIP_ASSERT("tcp_slowtmr: active pcb->state != TIME-WAIT\n", pcb->state != TIME_WAIT);
+
+ pcb_remove = 0;
+ pcb_reset = 0;
+
+ if (pcb->state == SYN_SENT && pcb->nrtx == TCP_SYNMAXRTX) {
+ ++pcb_remove;
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max SYN retries reached\n"));
+ }
+ else if (pcb->nrtx == TCP_MAXRTX) {
+ ++pcb_remove;
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: max DATA retries reached\n"));
+ } else {
+ if (pcb->persist_backoff > 0) {
+ /* If snd_wnd is zero, use persist timer to send 1 byte probes
+ * instead of using the standard retransmission mechanism. */
+ pcb->persist_cnt++;
+ if (pcb->persist_cnt >= tcp_persist_backoff[pcb->persist_backoff-1]) {
+ pcb->persist_cnt = 0;
+ if (pcb->persist_backoff < sizeof(tcp_persist_backoff)) {
+ pcb->persist_backoff++;
+ }
+ tcp_zero_window_probe(pcb);
+ }
+ } else {
+ /* Increase the retransmission timer if it is running */
+ if(pcb->rtime >= 0)
+ ++pcb->rtime;
+
+ if (pcb->unacked != NULL && pcb->rtime >= pcb->rto) {
+ /* Time for a retransmission. */
+ LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_slowtmr: rtime %"S16_F
+ " pcb->rto %"S16_F"\n",
+ pcb->rtime, pcb->rto));
+
+ /* Double retransmission time-out unless we are trying to
+ * connect to somebody (i.e., we are in SYN_SENT). */
+ if (pcb->state != SYN_SENT) {
+ pcb->rto = ((pcb->sa >> 3) + pcb->sv) << tcp_backoff[pcb->nrtx];
+ }
+
+ /* Reset the retransmission timer. */
+ pcb->rtime = 0;
+
+ /* Reduce congestion window and ssthresh. */
+ eff_wnd = LWIP_MIN(pcb->cwnd, pcb->snd_wnd);
+ pcb->ssthresh = eff_wnd >> 1;
+ if (pcb->ssthresh < (pcb->mss << 1)) {
+ pcb->ssthresh = (pcb->mss << 1);
+ }
+ pcb->cwnd = pcb->mss;
+ LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: cwnd %"U16_F
+ " ssthresh %"U16_F"\n",
+ pcb->cwnd, pcb->ssthresh));
+
+ /* The following needs to be called AFTER cwnd is set to one
+ mss - STJ */
+ tcp_rexmit_rto(pcb);
+ }
+ }
+ }
+ /* Check if this PCB has stayed too long in FIN-WAIT-2 */
+ if (pcb->state == FIN_WAIT_2) {
+ if ((u32_t)(tcp_ticks - pcb->tmr) >
+ TCP_FIN_WAIT_TIMEOUT / TCP_SLOW_INTERVAL) {
+ ++pcb_remove;
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in FIN-WAIT-2\n"));
+ }
+ }
+
+ /* Check if KEEPALIVE should be sent */
+ if((pcb->so_options & SOF_KEEPALIVE) &&
+ ((pcb->state == ESTABLISHED) ||
+ (pcb->state == CLOSE_WAIT))) {
+#if LWIP_TCP_KEEPALIVE
+ if((u32_t)(tcp_ticks - pcb->tmr) >
+ (pcb->keep_idle + (pcb->keep_cnt*pcb->keep_intvl))
+ / TCP_SLOW_INTERVAL)
+#else
+ if((u32_t)(tcp_ticks - pcb->tmr) >
+ (pcb->keep_idle + TCP_MAXIDLE) / TCP_SLOW_INTERVAL)
+#endif /* LWIP_TCP_KEEPALIVE */
+ {
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: KEEPALIVE timeout. Aborting connection to %"U16_F".%"U16_F".%"U16_F".%"U16_F".\n",
+ ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
+ ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
+
+ ++pcb_remove;
+ ++pcb_reset;
+ }
+#if LWIP_TCP_KEEPALIVE
+ else if((u32_t)(tcp_ticks - pcb->tmr) >
+ (pcb->keep_idle + pcb->keep_cnt_sent * pcb->keep_intvl)
+ / TCP_SLOW_INTERVAL)
+#else
+ else if((u32_t)(tcp_ticks - pcb->tmr) >
+ (pcb->keep_idle + pcb->keep_cnt_sent * TCP_KEEPINTVL_DEFAULT)
+ / TCP_SLOW_INTERVAL)
+#endif /* LWIP_TCP_KEEPALIVE */
+ {
+ tcp_keepalive(pcb);
+ pcb->keep_cnt_sent++;
+ }
+ }
+
+ /* If this PCB has queued out of sequence data, but has been
+ inactive for too long, will drop the data (it will eventually
+ be retransmitted). */
+#if TCP_QUEUE_OOSEQ
+ if (pcb->ooseq != NULL &&
+ (u32_t)tcp_ticks - pcb->tmr >= pcb->rto * TCP_OOSEQ_TIMEOUT) {
+ tcp_segs_free(pcb->ooseq);
+ pcb->ooseq = NULL;
+ LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_slowtmr: dropping OOSEQ queued data\n"));
+ }
+#endif /* TCP_QUEUE_OOSEQ */
+
+ /* Check if this PCB has stayed too long in SYN-RCVD */
+ if (pcb->state == SYN_RCVD) {
+ if ((u32_t)(tcp_ticks - pcb->tmr) >
+ TCP_SYN_RCVD_TIMEOUT / TCP_SLOW_INTERVAL) {
+ ++pcb_remove;
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in SYN-RCVD\n"));
+ }
+ }
+
+ /* Check if this PCB has stayed too long in LAST-ACK */
+ if (pcb->state == LAST_ACK) {
+ if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
+ ++pcb_remove;
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: removing pcb stuck in LAST-ACK\n"));
+ }
+ }
+
+ /* If the PCB should be removed, do it. */
+ if (pcb_remove) {
+ struct tcp_pcb *pcb2;
+ tcp_pcb_purge(pcb);
+ /* Remove PCB from tcp_active_pcbs list. */
+ if (prev != NULL) {
+ LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_active_pcbs", pcb != tcp_active_pcbs);
+ prev->next = pcb->next;
+ } else {
+ /* This PCB was the first. */
+ LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_active_pcbs", tcp_active_pcbs == pcb);
+ tcp_active_pcbs = pcb->next;
+ }
+
+ TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_ABRT);
+ if (pcb_reset) {
+ tcp_rst(pcb->snd_nxt, pcb->rcv_nxt, &pcb->local_ip, &pcb->remote_ip,
+ pcb->local_port, pcb->remote_port);
+ }
+
+ pcb2 = pcb;
+ pcb = pcb->next;
+ memp_free(MEMP_TCP_PCB, pcb2);
+ } else {
+ /* get the 'next' element now and work with 'prev' below (in case of abort) */
+ prev = pcb;
+ pcb = pcb->next;
+
+ /* We check if we should poll the connection. */
+ ++prev->polltmr;
+ if (prev->polltmr >= prev->pollinterval) {
+ prev->polltmr = 0;
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_slowtmr: polling application\n"));
+ TCP_EVENT_POLL(prev, err);
+ /* if err == ERR_ABRT, 'prev' is already deallocated */
+ if (err == ERR_OK) {
+ tcp_output(prev);
+ }
+ }
+ }
+ }
+
+
+ /* Steps through all of the TIME-WAIT PCBs. */
+ prev = NULL;
+ pcb = tcp_tw_pcbs;
+ while (pcb != NULL) {
+ LWIP_ASSERT("tcp_slowtmr: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
+ pcb_remove = 0;
+
+ /* Check if this PCB has stayed long enough in TIME-WAIT */
+ if ((u32_t)(tcp_ticks - pcb->tmr) > 2 * TCP_MSL / TCP_SLOW_INTERVAL) {
+ ++pcb_remove;
+ }
+
+
+
+ /* If the PCB should be removed, do it. */
+ if (pcb_remove) {
+ struct tcp_pcb *pcb2;
+ tcp_pcb_purge(pcb);
+ /* Remove PCB from tcp_tw_pcbs list. */
+ if (prev != NULL) {
+ LWIP_ASSERT("tcp_slowtmr: middle tcp != tcp_tw_pcbs", pcb != tcp_tw_pcbs);
+ prev->next = pcb->next;
+ } else {
+ /* This PCB was the first. */
+ LWIP_ASSERT("tcp_slowtmr: first pcb == tcp_tw_pcbs", tcp_tw_pcbs == pcb);
+ tcp_tw_pcbs = pcb->next;
+ }
+ pcb2 = pcb;
+ pcb = pcb->next;
+ memp_free(MEMP_TCP_PCB, pcb2);
+ } else {
+ prev = pcb;
+ pcb = pcb->next;
+ }
+ }
+}
+
+/**
+ * Is called every TCP_FAST_INTERVAL (250 ms) and process data previously
+ * "refused" by upper layer (application) and sends delayed ACKs.
+ *
+ * Automatically called from tcp_tmr().
+ */
+void
+tcp_fasttmr(void)
+{
+ struct tcp_pcb *pcb = tcp_active_pcbs;
+
+ while(pcb != NULL) {
+ struct tcp_pcb *next = pcb->next;
+ /* If there is data which was previously "refused" by upper layer */
+ if (pcb->refused_data != NULL) {
+ /* Notify again application with data previously received. */
+ err_t err;
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_fasttmr: notify kept packet\n"));
+ TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
+ if (err == ERR_OK) {
+ pcb->refused_data = NULL;
+ } else if (err == ERR_ABRT) {
+ /* if err == ERR_ABRT, 'pcb' is already deallocated */
+ pcb = NULL;
+ }
+ }
+
+ /* send delayed ACKs */
+ if (pcb && (pcb->flags & TF_ACK_DELAY)) {
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_fasttmr: delayed ACK\n"));
+ tcp_ack_now(pcb);
+ tcp_output(pcb);
+ pcb->flags &= ~(TF_ACK_DELAY | TF_ACK_NOW);
+ }
+
+ pcb = next;
+ }
+}
+
+/**
+ * Deallocates a list of TCP segments (tcp_seg structures).
+ *
+ * @param seg tcp_seg list of TCP segments to free
+ */
+void
+tcp_segs_free(struct tcp_seg *seg)
+{
+ while (seg != NULL) {
+ struct tcp_seg *next = seg->next;
+ tcp_seg_free(seg);
+ seg = next;
+ }
+}
+
+/**
+ * Frees a TCP segment (tcp_seg structure).
+ *
+ * @param seg single tcp_seg to free
+ */
+void
+tcp_seg_free(struct tcp_seg *seg)
+{
+ if (seg != NULL) {
+ if (seg->p != NULL) {
+ pbuf_free(seg->p);
+#if TCP_DEBUG
+ seg->p = NULL;
+#endif /* TCP_DEBUG */
+ }
+ memp_free(MEMP_TCP_SEG, seg);
+ }
+}
+
+/**
+ * Sets the priority of a connection.
+ *
+ * @param pcb the tcp_pcb to manipulate
+ * @param prio new priority
+ */
+void
+tcp_setprio(struct tcp_pcb *pcb, u8_t prio)
+{
+ pcb->prio = prio;
+}
+
+#if TCP_QUEUE_OOSEQ
+/**
+ * Returns a copy of the given TCP segment.
+ * The pbuf and data are not copied, only the pointers
+ *
+ * @param seg the old tcp_seg
+ * @return a copy of seg
+ */
+struct tcp_seg *
+tcp_seg_copy(struct tcp_seg *seg)
+{
+ struct tcp_seg *cseg;
+
+ cseg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG);
+ if (cseg == NULL) {
+ return NULL;
+ }
+ SMEMCPY((u8_t *)cseg, (const u8_t *)seg, sizeof(struct tcp_seg));
+ pbuf_ref(cseg->p);
+ return cseg;
+}
+#endif /* TCP_QUEUE_OOSEQ */
+
+#if LWIP_CALLBACK_API
+/**
+ * Default receive callback that is called if the user didn't register
+ * a recv callback for the pcb.
+ */
+err_t
+tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
+{
+ LWIP_UNUSED_ARG(arg);
+ if (p != NULL) {
+ tcp_recved(pcb, p->tot_len);
+ pbuf_free(p);
+ } else if (err == ERR_OK) {
+ return tcp_close(pcb);
+ }
+ return ERR_OK;
+}
+#endif /* LWIP_CALLBACK_API */
+
+/**
+ * Kills the oldest active connection that has lower priority than prio.
+ *
+ * @param prio minimum priority
+ */
+static void
+tcp_kill_prio(u8_t prio)
+{
+ struct tcp_pcb *pcb, *inactive;
+ u32_t inactivity;
+ u8_t mprio;
+
+
+ mprio = TCP_PRIO_MAX;
+
+ /* We kill the oldest active connection that has lower priority than prio. */
+ inactivity = 0;
+ inactive = NULL;
+ for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
+ if (pcb->prio <= prio &&
+ pcb->prio <= mprio &&
+ (u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
+ inactivity = tcp_ticks - pcb->tmr;
+ inactive = pcb;
+ mprio = pcb->prio;
+ }
+ }
+ if (inactive != NULL) {
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_prio: killing oldest PCB %p (%"S32_F")\n",
+ (void *)inactive, inactivity));
+ tcp_abort(inactive);
+ }
+}
+
+/**
+ * Kills the oldest connection that is in TIME_WAIT state.
+ * Called from tcp_alloc() if no more connections are available.
+ */
+static void
+tcp_kill_timewait(void)
+{
+ struct tcp_pcb *pcb, *inactive;
+ u32_t inactivity;
+
+ inactivity = 0;
+ inactive = NULL;
+ /* Go through the list of TIME_WAIT pcbs and get the oldest pcb. */
+ for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
+ if ((u32_t)(tcp_ticks - pcb->tmr) >= inactivity) {
+ inactivity = tcp_ticks - pcb->tmr;
+ inactive = pcb;
+ }
+ }
+ if (inactive != NULL) {
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_kill_timewait: killing oldest TIME-WAIT PCB %p (%"S32_F")\n",
+ (void *)inactive, inactivity));
+ tcp_abort(inactive);
+ }
+}
+
+/**
+ * Allocate a new tcp_pcb structure.
+ *
+ * @param prio priority for the new pcb
+ * @return a new tcp_pcb that initially is in state CLOSED
+ */
+struct tcp_pcb *
+tcp_alloc(u8_t prio)
+{
+ struct tcp_pcb *pcb;
+ u32_t iss;
+
+ pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
+ if (pcb == NULL) {
+ /* Try killing oldest connection in TIME-WAIT. */
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing off oldest TIME-WAIT connection\n"));
+ tcp_kill_timewait();
+ /* Try to allocate a tcp_pcb again. */
+ pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
+ if (pcb == NULL) {
+ /* Try killing active connections with lower priority than the new one. */
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_alloc: killing connection with prio lower than %d\n", prio));
+ tcp_kill_prio(prio);
+ /* Try to allocate a tcp_pcb again. */
+ pcb = (struct tcp_pcb *)memp_malloc(MEMP_TCP_PCB);
+ if (pcb != NULL) {
+ /* adjust err stats: memp_malloc failed twice before */
+ MEMP_STATS_DEC(err, MEMP_TCP_PCB);
+ }
+ }
+ if (pcb != NULL) {
+ /* adjust err stats: timewait PCB was freed above */
+ MEMP_STATS_DEC(err, MEMP_TCP_PCB);
+ }
+ }
+ if (pcb != NULL) {
+ memset(pcb, 0, sizeof(struct tcp_pcb));
+ pcb->prio = prio;
+ pcb->snd_buf = TCP_SND_BUF;
+ pcb->snd_queuelen = 0;
+ pcb->rcv_wnd = TCP_WND;
+ pcb->rcv_ann_wnd = TCP_WND;
+ pcb->tos = 0;
+ pcb->ttl = TCP_TTL;
+ /* As initial send MSS, we use TCP_MSS but limit it to 536.
+ The send MSS is updated when an MSS option is received. */
+ pcb->mss = (TCP_MSS > 536) ? 536 : TCP_MSS;
+ pcb->rto = 3000 / TCP_SLOW_INTERVAL;
+ pcb->sa = 0;
+ pcb->sv = 3000 / TCP_SLOW_INTERVAL;
+ pcb->rtime = -1;
+ pcb->cwnd = 1;
+ iss = tcp_next_iss();
+ pcb->snd_wl2 = iss;
+ pcb->snd_nxt = iss;
+ pcb->lastack = iss;
+ pcb->snd_lbb = iss;
+ pcb->tmr = tcp_ticks;
+
+ pcb->polltmr = 0;
+
+#if LWIP_CALLBACK_API
+ pcb->recv = tcp_recv_null;
+#endif /* LWIP_CALLBACK_API */
+
+ /* Init KEEPALIVE timer */
+ pcb->keep_idle = TCP_KEEPIDLE_DEFAULT;
+
+#if LWIP_TCP_KEEPALIVE
+ pcb->keep_intvl = TCP_KEEPINTVL_DEFAULT;
+ pcb->keep_cnt = TCP_KEEPCNT_DEFAULT;
+#endif /* LWIP_TCP_KEEPALIVE */
+
+ pcb->keep_cnt_sent = 0;
+ }
+ return pcb;
+}
+
+/**
+ * Creates a new TCP protocol control block but doesn't place it on
+ * any of the TCP PCB lists.
+ * The pcb is not put on any list until binding using tcp_bind().
+ *
+ * @internal: Maybe there should be a idle TCP PCB list where these
+ * PCBs are put on. Port reservation using tcp_bind() is implemented but
+ * allocated pcbs that are not bound can't be killed automatically if wanting
+ * to allocate a pcb with higher prio (@see tcp_kill_prio())
+ *
+ * @return a new tcp_pcb that initially is in state CLOSED
+ */
+struct tcp_pcb *
+tcp_new(void)
+{
+ return tcp_alloc(TCP_PRIO_NORMAL);
+}
+
+/**
+ * Used to specify the argument that should be passed callback
+ * functions.
+ *
+ * @param pcb tcp_pcb to set the callback argument
+ * @param arg void pointer argument to pass to callback functions
+ */
+void
+tcp_arg(struct tcp_pcb *pcb, void *arg)
+{
+ pcb->callback_arg = arg;
+}
+#if LWIP_CALLBACK_API
+
+/**
+ * Used to specify the function that should be called when a TCP
+ * connection receives data.
+ *
+ * @param pcb tcp_pcb to set the recv callback
+ * @param recv callback function to call for this pcb when data is received
+ */
+void
+tcp_recv(struct tcp_pcb *pcb, tcp_recv_fn recv)
+{
+ pcb->recv = recv;
+}
+
+/**
+ * Used to specify the function that should be called when TCP data
+ * has been successfully delivered to the remote host.
+ *
+ * @param pcb tcp_pcb to set the sent callback
+ * @param sent callback function to call for this pcb when data is successfully sent
+ */
+void
+tcp_sent(struct tcp_pcb *pcb, tcp_sent_fn sent)
+{
+ pcb->sent = sent;
+}
+
+/**
+ * Used to specify the function that should be called when a fatal error
+ * has occured on the connection.
+ *
+ * @param pcb tcp_pcb to set the err callback
+ * @param err callback function to call for this pcb when a fatal error
+ * has occured on the connection
+ */
+void
+tcp_err(struct tcp_pcb *pcb, tcp_err_fn err)
+{
+ pcb->errf = err;
+}
+
+/**
+ * Used for specifying the function that should be called when a
+ * LISTENing connection has been connected to another host.
+ *
+ * @param pcb tcp_pcb to set the accept callback
+ * @param accept callback function to call for this pcb when LISTENing
+ * connection has been connected to another host
+ */
+void
+tcp_accept(struct tcp_pcb *pcb, tcp_accept_fn accept)
+{
+ pcb->accept = accept;
+}
+#endif /* LWIP_CALLBACK_API */
+
+
+/**
+ * Used to specify the function that should be called periodically
+ * from TCP. The interval is specified in terms of the TCP coarse
+ * timer interval, which is called twice a second.
+ *
+ */
+void
+tcp_poll(struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval)
+{
+#if LWIP_CALLBACK_API
+ pcb->poll = poll;
+#else /* LWIP_CALLBACK_API */
+ LWIP_UNUSED_ARG(poll);
+#endif /* LWIP_CALLBACK_API */
+ pcb->pollinterval = interval;
+}
+
+/**
+ * Purges a TCP PCB. Removes any buffered data and frees the buffer memory
+ * (pcb->ooseq, pcb->unsent and pcb->unacked are freed).
+ *
+ * @param pcb tcp_pcb to purge. The pcb itself is not deallocated!
+ */
+void
+tcp_pcb_purge(struct tcp_pcb *pcb)
+{
+ if (pcb->state != CLOSED &&
+ pcb->state != TIME_WAIT &&
+ pcb->state != LISTEN) {
+
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge\n"));
+
+#if TCP_LISTEN_BACKLOG
+ if (pcb->state == SYN_RCVD) {
+ /* Need to find the corresponding listen_pcb and decrease its accepts_pending */
+ struct tcp_pcb_listen *lpcb;
+ LWIP_ASSERT("tcp_pcb_purge: pcb->state == SYN_RCVD but tcp_listen_pcbs is NULL",
+ tcp_listen_pcbs.listen_pcbs != NULL);
+ for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
+ if ((lpcb->local_port == pcb->local_port) &&
+ (ip_addr_isany(&lpcb->local_ip) ||
+ ip_addr_cmp(&pcb->local_ip, &lpcb->local_ip))) {
+ /* port and address of the listen pcb match the timed-out pcb */
+ LWIP_ASSERT("tcp_pcb_purge: listen pcb does not have accepts pending",
+ lpcb->accepts_pending > 0);
+ lpcb->accepts_pending--;
+ break;
+ }
+ }
+ }
+#endif /* TCP_LISTEN_BACKLOG */
+
+
+ if (pcb->refused_data != NULL) {
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->refused_data\n"));
+ pbuf_free(pcb->refused_data);
+ pcb->refused_data = NULL;
+ }
+ if (pcb->unsent != NULL) {
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: not all data sent\n"));
+ }
+ if (pcb->unacked != NULL) {
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->unacked\n"));
+ }
+#if TCP_QUEUE_OOSEQ
+ if (pcb->ooseq != NULL) {
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_pcb_purge: data left on ->ooseq\n"));
+ }
+ tcp_segs_free(pcb->ooseq);
+ pcb->ooseq = NULL;
+#endif /* TCP_QUEUE_OOSEQ */
+
+ /* Stop the retransmission timer as it will expect data on unacked
+ queue if it fires */
+ pcb->rtime = -1;
+
+ tcp_segs_free(pcb->unsent);
+ tcp_segs_free(pcb->unacked);
+ pcb->unacked = pcb->unsent = NULL;
+#if TCP_OVERSIZE
+ pcb->unsent_oversize = 0;
+#endif /* TCP_OVERSIZE */
+ }
+}
+
+/**
+ * Purges the PCB and removes it from a PCB list. Any delayed ACKs are sent first.
+ *
+ * @param pcblist PCB list to purge.
+ * @param pcb tcp_pcb to purge. The pcb itself is NOT deallocated!
+ */
+void
+tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb)
+{
+ TCP_RMV(pcblist, pcb);
+
+ tcp_pcb_purge(pcb);
+
+ /* if there is an outstanding delayed ACKs, send it */
+ if (pcb->state != TIME_WAIT &&
+ pcb->state != LISTEN &&
+ pcb->flags & TF_ACK_DELAY) {
+ pcb->flags |= TF_ACK_NOW;
+ tcp_output(pcb);
+ }
+
+ if (pcb->state != LISTEN) {
+ LWIP_ASSERT("unsent segments leaking", pcb->unsent == NULL);
+ LWIP_ASSERT("unacked segments leaking", pcb->unacked == NULL);
+#if TCP_QUEUE_OOSEQ
+ LWIP_ASSERT("ooseq segments leaking", pcb->ooseq == NULL);
+#endif /* TCP_QUEUE_OOSEQ */
+ }
+
+ pcb->state = CLOSED;
+
+ LWIP_ASSERT("tcp_pcb_remove: tcp_pcbs_sane()", tcp_pcbs_sane());
+}
+
+/**
+ * Calculates a new initial sequence number for new connections.
+ *
+ * @return u32_t pseudo random sequence number
+ */
+u32_t
+tcp_next_iss(void)
+{
+ static u32_t iss = 6510;
+
+ iss += tcp_ticks; /* XXX */
+ return iss;
+}
+
+#if TCP_CALCULATE_EFF_SEND_MSS
+/**
+ * Calcluates the effective send mss that can be used for a specific IP address
+ * by using ip_route to determin the netif used to send to the address and
+ * calculating the minimum of TCP_MSS and that netif's mtu (if set).
+ */
+u16_t
+tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr)
+{
+ u16_t mss_s;
+ struct netif *outif;
+
+ outif = ip_route(addr);
+ if ((outif != NULL) && (outif->mtu != 0)) {
+ mss_s = outif->mtu - IP_HLEN - TCP_HLEN;
+ /* RFC 1122, chap 4.2.2.6:
+ * Eff.snd.MSS = min(SendMSS+20, MMS_S) - TCPhdrsize - IPoptionsize
+ * We correct for TCP options in tcp_write(), and don't support IP options.
+ */
+ sendmss = LWIP_MIN(sendmss, mss_s);
+ }
+ return sendmss;
+}
+#endif /* TCP_CALCULATE_EFF_SEND_MSS */
+
+const char*
+tcp_debug_state_str(enum tcp_state s)
+{
+ return tcp_state_str[s];
+}
+
+#if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
+/**
+ * Print a tcp header for debugging purposes.
+ *
+ * @param tcphdr pointer to a struct tcp_hdr
+ */
+void
+tcp_debug_print(struct tcp_hdr *tcphdr)
+{
+ LWIP_DEBUGF(TCP_DEBUG, ("TCP header:\n"));
+ LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
+ LWIP_DEBUGF(TCP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
+ ntohs(tcphdr->src), ntohs(tcphdr->dest)));
+ LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
+ LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (seq no)\n",
+ ntohl(tcphdr->seqno)));
+ LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
+ LWIP_DEBUGF(TCP_DEBUG, ("| %010"U32_F" | (ack no)\n",
+ ntohl(tcphdr->ackno)));
+ LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
+ LWIP_DEBUGF(TCP_DEBUG, ("| %2"U16_F" | |%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"%"U16_F"| %5"U16_F" | (hdrlen, flags (",
+ TCPH_HDRLEN(tcphdr),
+ TCPH_FLAGS(tcphdr) >> 5 & 1,
+ TCPH_FLAGS(tcphdr) >> 4 & 1,
+ TCPH_FLAGS(tcphdr) >> 3 & 1,
+ TCPH_FLAGS(tcphdr) >> 2 & 1,
+ TCPH_FLAGS(tcphdr) >> 1 & 1,
+ TCPH_FLAGS(tcphdr) & 1,
+ ntohs(tcphdr->wnd)));
+ tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
+ LWIP_DEBUGF(TCP_DEBUG, ("), win)\n"));
+ LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
+ LWIP_DEBUGF(TCP_DEBUG, ("| 0x%04"X16_F" | %5"U16_F" | (chksum, urgp)\n",
+ ntohs(tcphdr->chksum), ntohs(tcphdr->urgp)));
+ LWIP_DEBUGF(TCP_DEBUG, ("+-------------------------------+\n"));
+}
+
+/**
+ * Print a tcp state for debugging purposes.
+ *
+ * @param s enum tcp_state to print
+ */
+void
+tcp_debug_print_state(enum tcp_state s)
+{
+ LWIP_DEBUGF(TCP_DEBUG, ("State: %s\n", tcp_state_str[s]));
+}
+
+/**
+ * Print tcp flags for debugging purposes.
+ *
+ * @param flags tcp flags, all active flags are printed
+ */
+void
+tcp_debug_print_flags(u8_t flags)
+{
+ if (flags & TCP_FIN) {
+ LWIP_DEBUGF(TCP_DEBUG, ("FIN "));
+ }
+ if (flags & TCP_SYN) {
+ LWIP_DEBUGF(TCP_DEBUG, ("SYN "));
+ }
+ if (flags & TCP_RST) {
+ LWIP_DEBUGF(TCP_DEBUG, ("RST "));
+ }
+ if (flags & TCP_PSH) {
+ LWIP_DEBUGF(TCP_DEBUG, ("PSH "));
+ }
+ if (flags & TCP_ACK) {
+ LWIP_DEBUGF(TCP_DEBUG, ("ACK "));
+ }
+ if (flags & TCP_URG) {
+ LWIP_DEBUGF(TCP_DEBUG, ("URG "));
+ }
+ if (flags & TCP_ECE) {
+ LWIP_DEBUGF(TCP_DEBUG, ("ECE "));
+ }
+ if (flags & TCP_CWR) {
+ LWIP_DEBUGF(TCP_DEBUG, ("CWR "));
+ }
+ LWIP_DEBUGF(TCP_DEBUG, ("\n"));
+}
+
+/**
+ * Print all tcp_pcbs in every list for debugging purposes.
+ */
+void
+tcp_debug_print_pcbs(void)
+{
+ struct tcp_pcb *pcb;
+ LWIP_DEBUGF(TCP_DEBUG, ("Active PCB states:\n"));
+ for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
+ LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
+ pcb->local_port, pcb->remote_port,
+ pcb->snd_nxt, pcb->rcv_nxt));
+ tcp_debug_print_state(pcb->state);
+ }
+ LWIP_DEBUGF(TCP_DEBUG, ("Listen PCB states:\n"));
+ for(pcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs; pcb != NULL; pcb = pcb->next) {
+ LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
+ pcb->local_port, pcb->remote_port,
+ pcb->snd_nxt, pcb->rcv_nxt));
+ tcp_debug_print_state(pcb->state);
+ }
+ LWIP_DEBUGF(TCP_DEBUG, ("TIME-WAIT PCB states:\n"));
+ for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
+ LWIP_DEBUGF(TCP_DEBUG, ("Local port %"U16_F", foreign port %"U16_F" snd_nxt %"U32_F" rcv_nxt %"U32_F" ",
+ pcb->local_port, pcb->remote_port,
+ pcb->snd_nxt, pcb->rcv_nxt));
+ tcp_debug_print_state(pcb->state);
+ }
+}
+
+/**
+ * Check state consistency of the tcp_pcb lists.
+ */
+s16_t
+tcp_pcbs_sane(void)
+{
+ struct tcp_pcb *pcb;
+ for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
+ LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != CLOSED", pcb->state != CLOSED);
+ LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != LISTEN", pcb->state != LISTEN);
+ LWIP_ASSERT("tcp_pcbs_sane: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
+ }
+ for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
+ LWIP_ASSERT("tcp_pcbs_sane: tw pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
+ }
+ return 1;
+}
+#endif /* TCP_DEBUG */
+
+#endif /* LWIP_TCP */
--- /dev/null
+/**
+ * @file
+ * Transmission Control Protocol, incoming traffic
+ *
+ * The input processing functions of the TCP layer.
+ *
+ * These functions are generally called in the order (ip_input() ->)
+ * tcp_input() -> * tcp_process() -> tcp_receive() (-> application).
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/tcp_impl.h"
+#include "lwip/def.h"
+#include "lwip/ip_addr.h"
+#include "lwip/netif.h"
+#include "lwip/mem.h"
+#include "lwip/memp.h"
+#include "lwip/inet_chksum.h"
+#include "lwip/stats.h"
+#include "lwip/snmp.h"
+#include "arch/perf.h"
+
+/* These variables are global to all functions involved in the input
+ processing of TCP segments. They are set by the tcp_input()
+ function. */
+static struct tcp_seg inseg;
+static struct tcp_hdr *tcphdr;
+static struct ip_hdr *iphdr;
+static u32_t seqno, ackno;
+static u8_t flags;
+static u16_t tcplen;
+
+static u8_t recv_flags;
+static struct pbuf *recv_data;
+
+struct tcp_pcb *tcp_input_pcb;
+
+/* Forward declarations. */
+static err_t tcp_process(struct tcp_pcb *pcb);
+static void tcp_receive(struct tcp_pcb *pcb);
+static void tcp_parseopt(struct tcp_pcb *pcb);
+
+static err_t tcp_listen_input(struct tcp_pcb_listen *pcb);
+static err_t tcp_timewait_input(struct tcp_pcb *pcb);
+
+/**
+ * The initial input processing of TCP. It verifies the TCP header, demultiplexes
+ * the segment between the PCBs and passes it on to tcp_process(), which implements
+ * the TCP finite state machine. This function is called by the IP layer (in
+ * ip_input()).
+ *
+ * @param p received TCP segment to process (p->payload pointing to the IP header)
+ * @param inp network interface on which this segment was received
+ */
+void
+tcp_input(struct pbuf *p, struct netif *inp)
+{
+ struct tcp_pcb *pcb, *prev;
+ struct tcp_pcb_listen *lpcb;
+#if SO_REUSE
+ struct tcp_pcb *lpcb_prev = NULL;
+ struct tcp_pcb_listen *lpcb_any = NULL;
+#endif /* SO_REUSE */
+ u8_t hdrlen;
+ err_t err;
+
+ PERF_START;
+
+ TCP_STATS_INC(tcp.recv);
+ snmp_inc_tcpinsegs();
+
+ iphdr = (struct ip_hdr *)p->payload;
+ tcphdr = (struct tcp_hdr *)((u8_t *)p->payload + IPH_HL(iphdr) * 4);
+
+#if TCP_INPUT_DEBUG
+ tcp_debug_print(tcphdr);
+#endif
+
+ /* remove header from payload */
+ if (pbuf_header(p, -((s16_t)(IPH_HL(iphdr) * 4))) || (p->tot_len < sizeof(struct tcp_hdr))) {
+ /* drop short packets */
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: short packet (%"U16_F" bytes) discarded\n", p->tot_len));
+ TCP_STATS_INC(tcp.lenerr);
+ TCP_STATS_INC(tcp.drop);
+ snmp_inc_tcpinerrs();
+ pbuf_free(p);
+ return;
+ }
+
+ /* Don't even process incoming broadcasts/multicasts. */
+ if (ip_addr_isbroadcast(¤t_iphdr_dest, inp) ||
+ ip_addr_ismulticast(¤t_iphdr_dest)) {
+ TCP_STATS_INC(tcp.proterr);
+ TCP_STATS_INC(tcp.drop);
+ snmp_inc_tcpinerrs();
+ pbuf_free(p);
+ return;
+ }
+
+#if CHECKSUM_CHECK_TCP
+ /* Verify TCP checksum. */
+ if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
+ IP_PROTO_TCP, p->tot_len) != 0) {
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: packet discarded due to failing checksum 0x%04"X16_F"\n",
+ inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
+ IP_PROTO_TCP, p->tot_len)));
+#if TCP_DEBUG
+ tcp_debug_print(tcphdr);
+#endif /* TCP_DEBUG */
+ TCP_STATS_INC(tcp.chkerr);
+ TCP_STATS_INC(tcp.drop);
+ snmp_inc_tcpinerrs();
+ pbuf_free(p);
+ return;
+ }
+#endif
+
+ /* Move the payload pointer in the pbuf so that it points to the
+ TCP data instead of the TCP header. */
+ hdrlen = TCPH_HDRLEN(tcphdr);
+ if(pbuf_header(p, -(hdrlen * 4))){
+ /* drop short packets */
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: short packet\n"));
+ TCP_STATS_INC(tcp.lenerr);
+ TCP_STATS_INC(tcp.drop);
+ snmp_inc_tcpinerrs();
+ pbuf_free(p);
+ return;
+ }
+
+ /* Convert fields in TCP header to host byte order. */
+ tcphdr->src = ntohs(tcphdr->src);
+ tcphdr->dest = ntohs(tcphdr->dest);
+ seqno = tcphdr->seqno = ntohl(tcphdr->seqno);
+ ackno = tcphdr->ackno = ntohl(tcphdr->ackno);
+ tcphdr->wnd = ntohs(tcphdr->wnd);
+
+ flags = TCPH_FLAGS(tcphdr);
+ tcplen = p->tot_len + ((flags & (TCP_FIN | TCP_SYN)) ? 1 : 0);
+
+ /* Demultiplex an incoming segment. First, we check if it is destined
+ for an active connection. */
+ prev = NULL;
+
+
+ for(pcb = tcp_active_pcbs; pcb != NULL; pcb = pcb->next) {
+ LWIP_ASSERT("tcp_input: active pcb->state != CLOSED", pcb->state != CLOSED);
+ LWIP_ASSERT("tcp_input: active pcb->state != TIME-WAIT", pcb->state != TIME_WAIT);
+ LWIP_ASSERT("tcp_input: active pcb->state != LISTEN", pcb->state != LISTEN);
+ if (pcb->remote_port == tcphdr->src &&
+ pcb->local_port == tcphdr->dest &&
+ ip_addr_cmp(&(pcb->remote_ip), ¤t_iphdr_src) &&
+ ip_addr_cmp(&(pcb->local_ip), ¤t_iphdr_dest)) {
+
+ /* Move this PCB to the front of the list so that subsequent
+ lookups will be faster (we exploit locality in TCP segment
+ arrivals). */
+ LWIP_ASSERT("tcp_input: pcb->next != pcb (before cache)", pcb->next != pcb);
+ if (prev != NULL) {
+ prev->next = pcb->next;
+ pcb->next = tcp_active_pcbs;
+ tcp_active_pcbs = pcb;
+ }
+ LWIP_ASSERT("tcp_input: pcb->next != pcb (after cache)", pcb->next != pcb);
+ break;
+ }
+ prev = pcb;
+ }
+
+ if (pcb == NULL) {
+ /* If it did not go to an active connection, we check the connections
+ in the TIME-WAIT state. */
+ for(pcb = tcp_tw_pcbs; pcb != NULL; pcb = pcb->next) {
+ LWIP_ASSERT("tcp_input: TIME-WAIT pcb->state == TIME-WAIT", pcb->state == TIME_WAIT);
+ if (pcb->remote_port == tcphdr->src &&
+ pcb->local_port == tcphdr->dest &&
+ ip_addr_cmp(&(pcb->remote_ip), ¤t_iphdr_src) &&
+ ip_addr_cmp(&(pcb->local_ip), ¤t_iphdr_dest)) {
+ /* We don't really care enough to move this PCB to the front
+ of the list since we are not very likely to receive that
+ many segments for connections in TIME-WAIT. */
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: packed for TIME_WAITing connection.\n"));
+ tcp_timewait_input(pcb);
+ pbuf_free(p);
+ return;
+ }
+ }
+
+ /* Finally, if we still did not get a match, we check all PCBs that
+ are LISTENing for incoming connections. */
+ prev = NULL;
+ for(lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
+ if (lpcb->local_port == tcphdr->dest) {
+#if SO_REUSE
+ if (ip_addr_cmp(&(lpcb->local_ip), ¤t_iphdr_dest)) {
+ /* found an exact match */
+ break;
+ } else if(ip_addr_isany(&(lpcb->local_ip))) {
+ /* found an ANY-match */
+ lpcb_any = lpcb;
+ lpcb_prev = prev;
+ }
+#else /* SO_REUSE */
+ if (ip_addr_cmp(&(lpcb->local_ip), ¤t_iphdr_dest) ||
+ ip_addr_isany(&(lpcb->local_ip))) {
+ /* found a match */
+ break;
+ }
+#endif /* SO_REUSE */
+ }
+ prev = (struct tcp_pcb *)lpcb;
+ }
+#if SO_REUSE
+ /* first try specific local IP */
+ if (lpcb == NULL) {
+ /* only pass to ANY if no specific local IP has been found */
+ lpcb = lpcb_any;
+ prev = lpcb_prev;
+ }
+#endif /* SO_REUSE */
+ if (lpcb != NULL) {
+ /* Move this PCB to the front of the list so that subsequent
+ lookups will be faster (we exploit locality in TCP segment
+ arrivals). */
+ if (prev != NULL) {
+ ((struct tcp_pcb_listen *)prev)->next = lpcb->next;
+ /* our successor is the remainder of the listening list */
+ lpcb->next = tcp_listen_pcbs.listen_pcbs;
+ /* put this listening pcb at the head of the listening list */
+ tcp_listen_pcbs.listen_pcbs = lpcb;
+ }
+
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: packed for LISTENing connection.\n"));
+ tcp_listen_input(lpcb);
+ pbuf_free(p);
+ return;
+ }
+ }
+
+#if TCP_INPUT_DEBUG
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags "));
+ tcp_debug_print_flags(TCPH_FLAGS(tcphdr));
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("-+-+-+-+-+-+-+-+-+-+-+-+-+-+\n"));
+#endif /* TCP_INPUT_DEBUG */
+
+
+ if (pcb != NULL) {
+ /* The incoming segment belongs to a connection. */
+#if TCP_INPUT_DEBUG
+#if TCP_DEBUG
+ tcp_debug_print_state(pcb->state);
+#endif /* TCP_DEBUG */
+#endif /* TCP_INPUT_DEBUG */
+
+ /* Set up a tcp_seg structure. */
+ inseg.next = NULL;
+ inseg.len = p->tot_len;
+ inseg.p = p;
+ inseg.tcphdr = tcphdr;
+
+ recv_data = NULL;
+ recv_flags = 0;
+
+ /* If there is data which was previously "refused" by upper layer */
+ if (pcb->refused_data != NULL) {
+ /* Notify again application with data previously received. */
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: notify kept packet\n"));
+ TCP_EVENT_RECV(pcb, pcb->refused_data, ERR_OK, err);
+ if (err == ERR_OK) {
+ pcb->refused_data = NULL;
+ } else if ((err == ERR_ABRT) || (tcplen > 0)) {
+ /* if err == ERR_ABRT, 'pcb' is already deallocated */
+ /* Drop incoming packets because pcb is "full" (only if the incoming
+ segment contains data). */
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: drop incoming packets, because pcb is \"full\"\n"));
+ TCP_STATS_INC(tcp.drop);
+ snmp_inc_tcpinerrs();
+ pbuf_free(p);
+ return;
+ }
+ }
+ tcp_input_pcb = pcb;
+ err = tcp_process(pcb);
+ /* A return value of ERR_ABRT means that tcp_abort() was called
+ and that the pcb has been freed. If so, we don't do anything. */
+ if (err != ERR_ABRT) {
+ if (recv_flags & TF_RESET) {
+ /* TF_RESET means that the connection was reset by the other
+ end. We then call the error callback to inform the
+ application that the connection is dead before we
+ deallocate the PCB. */
+ TCP_EVENT_ERR(pcb->errf, pcb->callback_arg, ERR_RST);
+ tcp_pcb_remove(&tcp_active_pcbs, pcb);
+ memp_free(MEMP_TCP_PCB, pcb);
+ } else if (recv_flags & TF_CLOSED) {
+ /* The connection has been closed and we will deallocate the
+ PCB. */
+ tcp_pcb_remove(&tcp_active_pcbs, pcb);
+ memp_free(MEMP_TCP_PCB, pcb);
+ } else {
+ err = ERR_OK;
+ /* If the application has registered a "sent" function to be
+ called when new send buffer space is available, we call it
+ now. */
+ if (pcb->acked > 0) {
+ TCP_EVENT_SENT(pcb, pcb->acked, err);
+ if (err == ERR_ABRT) {
+ goto aborted;
+ }
+ }
+
+ if (recv_data != NULL) {
+ LWIP_ASSERT("pcb->refused_data == NULL", pcb->refused_data == NULL);
+ if (pcb->flags & TF_RXCLOSED) {
+ /* received data although already closed -> abort (send RST) to
+ notify the remote host that not all data has been processed */
+ pbuf_free(recv_data);
+ tcp_abort(pcb);
+ goto aborted;
+ }
+ if (flags & TCP_PSH) {
+ recv_data->flags |= PBUF_FLAG_PUSH;
+ }
+
+ /* Notify application that data has been received. */
+ TCP_EVENT_RECV(pcb, recv_data, ERR_OK, err);
+ if (err == ERR_ABRT) {
+ goto aborted;
+ }
+
+ /* If the upper layer can't receive this data, store it */
+ if (err != ERR_OK) {
+ pcb->refused_data = recv_data;
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_input: keep incoming packet, because pcb is \"full\"\n"));
+ }
+ }
+
+ /* If a FIN segment was received, we call the callback
+ function with a NULL buffer to indicate EOF. */
+ if (recv_flags & TF_GOT_FIN) {
+ /* correct rcv_wnd as the application won't call tcp_recved()
+ for the FIN's seqno */
+ if (pcb->rcv_wnd != TCP_WND) {
+ pcb->rcv_wnd++;
+ }
+ TCP_EVENT_CLOSED(pcb, err);
+ if (err == ERR_ABRT) {
+ goto aborted;
+ }
+ }
+
+ tcp_input_pcb = NULL;
+ /* Try to send something out. */
+ tcp_output(pcb);
+#if TCP_INPUT_DEBUG
+#if TCP_DEBUG
+ tcp_debug_print_state(pcb->state);
+#endif /* TCP_DEBUG */
+#endif /* TCP_INPUT_DEBUG */
+ }
+ }
+ /* Jump target if pcb has been aborted in a callback (by calling tcp_abort()).
+ Below this line, 'pcb' may not be dereferenced! */
+aborted:
+ tcp_input_pcb = NULL;
+ recv_data = NULL;
+
+ /* give up our reference to inseg.p */
+ if (inseg.p != NULL)
+ {
+ pbuf_free(inseg.p);
+ inseg.p = NULL;
+ }
+ } else {
+
+ /* If no matching PCB was found, send a TCP RST (reset) to the
+ sender. */
+ LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_input: no PCB match found, resetting.\n"));
+ if (!(TCPH_FLAGS(tcphdr) & TCP_RST)) {
+ TCP_STATS_INC(tcp.proterr);
+ TCP_STATS_INC(tcp.drop);
+ tcp_rst(ackno, seqno + tcplen,
+ ip_current_dest_addr(), ip_current_src_addr(),
+ tcphdr->dest, tcphdr->src);
+ }
+ pbuf_free(p);
+ }
+
+ LWIP_ASSERT("tcp_input: tcp_pcbs_sane()", tcp_pcbs_sane());
+ PERF_STOP("tcp_input");
+}
+
+/**
+ * Called by tcp_input() when a segment arrives for a listening
+ * connection (from tcp_input()).
+ *
+ * @param pcb the tcp_pcb_listen for which a segment arrived
+ * @return ERR_OK if the segment was processed
+ * another err_t on error
+ *
+ * @note the return value is not (yet?) used in tcp_input()
+ * @note the segment which arrived is saved in global variables, therefore only the pcb
+ * involved is passed as a parameter to this function
+ */
+static err_t
+tcp_listen_input(struct tcp_pcb_listen *pcb)
+{
+ struct tcp_pcb *npcb;
+ err_t rc;
+
+ /* In the LISTEN state, we check for incoming SYN segments,
+ creates a new PCB, and responds with a SYN|ACK. */
+ if (flags & TCP_ACK) {
+ /* For incoming segments with the ACK flag set, respond with a
+ RST. */
+ LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_listen_input: ACK in LISTEN, sending reset\n"));
+ tcp_rst(ackno + 1, seqno + tcplen,
+ ip_current_dest_addr(), ip_current_src_addr(),
+ tcphdr->dest, tcphdr->src);
+ } else if (flags & TCP_SYN) {
+ LWIP_DEBUGF(TCP_DEBUG, ("TCP connection request %"U16_F" -> %"U16_F".\n", tcphdr->src, tcphdr->dest));
+#if TCP_LISTEN_BACKLOG
+ if (pcb->accepts_pending >= pcb->backlog) {
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_listen_input: listen backlog exceeded for port %"U16_F"\n", tcphdr->dest));
+ return ERR_ABRT;
+ }
+#endif /* TCP_LISTEN_BACKLOG */
+ npcb = tcp_alloc(pcb->prio);
+ /* If a new PCB could not be created (probably due to lack of memory),
+ we don't do anything, but rely on the sender will retransmit the
+ SYN at a time when we have more memory available. */
+ if (npcb == NULL) {
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_listen_input: could not allocate PCB\n"));
+ TCP_STATS_INC(tcp.memerr);
+ return ERR_MEM;
+ }
+#if TCP_LISTEN_BACKLOG
+ pcb->accepts_pending++;
+#endif /* TCP_LISTEN_BACKLOG */
+ /* Set up the new PCB. */
+ ip_addr_copy(npcb->local_ip, current_iphdr_dest);
+ npcb->local_port = pcb->local_port;
+ ip_addr_copy(npcb->remote_ip, current_iphdr_src);
+ npcb->remote_port = tcphdr->src;
+ npcb->state = SYN_RCVD;
+ npcb->rcv_nxt = seqno + 1;
+ npcb->rcv_ann_right_edge = npcb->rcv_nxt;
+ npcb->snd_wnd = tcphdr->wnd;
+ npcb->ssthresh = npcb->snd_wnd;
+ npcb->snd_wl1 = seqno - 1;/* initialise to seqno-1 to force window update */
+ npcb->callback_arg = pcb->callback_arg;
+#if LWIP_CALLBACK_API
+ npcb->accept = pcb->accept;
+#endif /* LWIP_CALLBACK_API */
+ /* inherit socket options */
+ npcb->so_options = pcb->so_options & SOF_INHERITED;
+ /* Register the new PCB so that we can begin receiving segments
+ for it. */
+ TCP_REG(&tcp_active_pcbs, npcb);
+
+ /* Parse any options in the SYN. */
+ tcp_parseopt(npcb);
+#if TCP_CALCULATE_EFF_SEND_MSS
+ npcb->mss = tcp_eff_send_mss(npcb->mss, &(npcb->remote_ip));
+#endif /* TCP_CALCULATE_EFF_SEND_MSS */
+
+ snmp_inc_tcppassiveopens();
+
+ /* Send a SYN|ACK together with the MSS option. */
+ rc = tcp_enqueue_flags(npcb, TCP_SYN | TCP_ACK);
+ if (rc != ERR_OK) {
+ tcp_abandon(npcb, 0);
+ return rc;
+ }
+ return tcp_output(npcb);
+ }
+ return ERR_OK;
+}
+
+/**
+ * Called by tcp_input() when a segment arrives for a connection in
+ * TIME_WAIT.
+ *
+ * @param pcb the tcp_pcb for which a segment arrived
+ *
+ * @note the segment which arrived is saved in global variables, therefore only the pcb
+ * involved is passed as a parameter to this function
+ */
+static err_t
+tcp_timewait_input(struct tcp_pcb *pcb)
+{
+ /* RFC 1337: in TIME_WAIT, ignore RST and ACK FINs + any 'acceptable' segments */
+ /* RFC 793 3.9 Event Processing - Segment Arrives:
+ * - first check sequence number - we skip that one in TIME_WAIT (always
+ * acceptable since we only send ACKs)
+ * - second check the RST bit (... return) */
+ if (flags & TCP_RST) {
+ return ERR_OK;
+ }
+ /* - fourth, check the SYN bit, */
+ if (flags & TCP_SYN) {
+ /* If an incoming segment is not acceptable, an acknowledgment
+ should be sent in reply */
+ if (TCP_SEQ_BETWEEN(seqno, pcb->rcv_nxt, pcb->rcv_nxt+pcb->rcv_wnd)) {
+ /* If the SYN is in the window it is an error, send a reset */
+ tcp_rst(ackno, seqno + tcplen, ip_current_dest_addr(), ip_current_src_addr(),
+ tcphdr->dest, tcphdr->src);
+ return ERR_OK;
+ }
+ } else if (flags & TCP_FIN) {
+ /* - eighth, check the FIN bit: Remain in the TIME-WAIT state.
+ Restart the 2 MSL time-wait timeout.*/
+ pcb->tmr = tcp_ticks;
+ }
+
+ if ((tcplen > 0)) {
+ /* Acknowledge data, FIN or out-of-window SYN */
+ pcb->flags |= TF_ACK_NOW;
+ return tcp_output(pcb);
+ }
+ return ERR_OK;
+}
+
+/**
+ * Implements the TCP state machine. Called by tcp_input. In some
+ * states tcp_receive() is called to receive data. The tcp_seg
+ * argument will be freed by the caller (tcp_input()) unless the
+ * recv_data pointer in the pcb is set.
+ *
+ * @param pcb the tcp_pcb for which a segment arrived
+ *
+ * @note the segment which arrived is saved in global variables, therefore only the pcb
+ * involved is passed as a parameter to this function
+ */
+static err_t
+tcp_process(struct tcp_pcb *pcb)
+{
+ struct tcp_seg *rseg;
+ u8_t acceptable = 0;
+ err_t err;
+
+ err = ERR_OK;
+
+ /* Process incoming RST segments. */
+ if (flags & TCP_RST) {
+ /* First, determine if the reset is acceptable. */
+ if (pcb->state == SYN_SENT) {
+ if (ackno == pcb->snd_nxt) {
+ acceptable = 1;
+ }
+ } else {
+ if (TCP_SEQ_BETWEEN(seqno, pcb->rcv_nxt,
+ pcb->rcv_nxt+pcb->rcv_wnd)) {
+ acceptable = 1;
+ }
+ }
+
+ if (acceptable) {
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_process: Connection RESET\n"));
+ LWIP_ASSERT("tcp_input: pcb->state != CLOSED", pcb->state != CLOSED);
+ recv_flags |= TF_RESET;
+ pcb->flags &= ~TF_ACK_DELAY;
+ return ERR_RST;
+ } else {
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_process: unacceptable reset seqno %"U32_F" rcv_nxt %"U32_F"\n",
+ seqno, pcb->rcv_nxt));
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_process: unacceptable reset seqno %"U32_F" rcv_nxt %"U32_F"\n",
+ seqno, pcb->rcv_nxt));
+ return ERR_OK;
+ }
+ }
+
+ if ((flags & TCP_SYN) && (pcb->state != SYN_SENT && pcb->state != SYN_RCVD)) {
+ /* Cope with new connection attempt after remote end crashed */
+ tcp_ack_now(pcb);
+ return ERR_OK;
+ }
+
+ if ((pcb->flags & TF_RXCLOSED) == 0) {
+ /* Update the PCB (in)activity timer unless rx is closed (see tcp_shutdown) */
+ pcb->tmr = tcp_ticks;
+ }
+ pcb->keep_cnt_sent = 0;
+
+ tcp_parseopt(pcb);
+
+ /* Do different things depending on the TCP state. */
+ switch (pcb->state) {
+ case SYN_SENT:
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("SYN-SENT: ackno %"U32_F" pcb->snd_nxt %"U32_F" unacked %"U32_F"\n", ackno,
+ pcb->snd_nxt, ntohl(pcb->unacked->tcphdr->seqno)));
+ /* received SYN ACK with expected sequence number? */
+ if ((flags & TCP_ACK) && (flags & TCP_SYN)
+ && ackno == ntohl(pcb->unacked->tcphdr->seqno) + 1) {
+ pcb->snd_buf++;
+ pcb->rcv_nxt = seqno + 1;
+ pcb->rcv_ann_right_edge = pcb->rcv_nxt;
+ pcb->lastack = ackno;
+ pcb->snd_wnd = tcphdr->wnd;
+ pcb->snd_wl1 = seqno - 1; /* initialise to seqno - 1 to force window update */
+ pcb->state = ESTABLISHED;
+
+#if TCP_CALCULATE_EFF_SEND_MSS
+ pcb->mss = tcp_eff_send_mss(pcb->mss, &(pcb->remote_ip));
+#endif /* TCP_CALCULATE_EFF_SEND_MSS */
+
+ /* Set ssthresh again after changing pcb->mss (already set in tcp_connect
+ * but for the default value of pcb->mss) */
+ pcb->ssthresh = pcb->mss * 10;
+
+ pcb->cwnd = ((pcb->cwnd == 1) ? (pcb->mss * 2) : pcb->mss);
+ LWIP_ASSERT("pcb->snd_queuelen > 0", (pcb->snd_queuelen > 0));
+ --pcb->snd_queuelen;
+ LWIP_DEBUGF(TCP_QLEN_DEBUG, ("tcp_process: SYN-SENT --queuelen %"U16_F"\n", (u16_t)pcb->snd_queuelen));
+ rseg = pcb->unacked;
+ pcb->unacked = rseg->next;
+
+ /* If there's nothing left to acknowledge, stop the retransmit
+ timer, otherwise reset it to start again */
+ if(pcb->unacked == NULL)
+ pcb->rtime = -1;
+ else {
+ pcb->rtime = 0;
+ pcb->nrtx = 0;
+ }
+
+ tcp_seg_free(rseg);
+
+ /* Call the user specified function to call when sucessfully
+ * connected. */
+ TCP_EVENT_CONNECTED(pcb, ERR_OK, err);
+ if (err == ERR_ABRT) {
+ return ERR_ABRT;
+ }
+ tcp_ack_now(pcb);
+ }
+ /* received ACK? possibly a half-open connection */
+ else if (flags & TCP_ACK) {
+ /* send a RST to bring the other side in a non-synchronized state. */
+ tcp_rst(ackno, seqno + tcplen, ip_current_dest_addr(), ip_current_src_addr(),
+ tcphdr->dest, tcphdr->src);
+ }
+ break;
+ case SYN_RCVD:
+ if (flags & TCP_ACK) {
+ /* expected ACK number? */
+ if (TCP_SEQ_BETWEEN(ackno, pcb->lastack+1, pcb->snd_nxt)) {
+ u16_t old_cwnd;
+ pcb->state = ESTABLISHED;
+ LWIP_DEBUGF(TCP_DEBUG, ("TCP connection established %"U16_F" -> %"U16_F".\n", inseg.tcphdr->src, inseg.tcphdr->dest));
+#if LWIP_CALLBACK_API
+ LWIP_ASSERT("pcb->accept != NULL", pcb->accept != NULL);
+#endif
+ /* Call the accept function. */
+ TCP_EVENT_ACCEPT(pcb, ERR_OK, err);
+ if (err != ERR_OK) {
+ /* If the accept function returns with an error, we abort
+ * the connection. */
+ /* Already aborted? */
+ if (err != ERR_ABRT) {
+ tcp_abort(pcb);
+ }
+ return ERR_ABRT;
+ }
+ old_cwnd = pcb->cwnd;
+ /* If there was any data contained within this ACK,
+ * we'd better pass it on to the application as well. */
+ tcp_receive(pcb);
+
+ /* Prevent ACK for SYN to generate a sent event */
+ if (pcb->acked != 0) {
+ pcb->acked--;
+ }
+
+ pcb->cwnd = ((old_cwnd == 1) ? (pcb->mss * 2) : pcb->mss);
+
+ if (recv_flags & TF_GOT_FIN) {
+ tcp_ack_now(pcb);
+ pcb->state = CLOSE_WAIT;
+ }
+ } else {
+ /* incorrect ACK number, send RST */
+ tcp_rst(ackno, seqno + tcplen, ip_current_dest_addr(), ip_current_src_addr(),
+ tcphdr->dest, tcphdr->src);
+ }
+ } else if ((flags & TCP_SYN) && (seqno == pcb->rcv_nxt - 1)) {
+ /* Looks like another copy of the SYN - retransmit our SYN-ACK */
+ tcp_rexmit(pcb);
+ }
+ break;
+ case CLOSE_WAIT:
+ /* FALLTHROUGH */
+ case ESTABLISHED:
+ tcp_receive(pcb);
+ if (recv_flags & TF_GOT_FIN) { /* passive close */
+ tcp_ack_now(pcb);
+ pcb->state = CLOSE_WAIT;
+ }
+ break;
+ case FIN_WAIT_1:
+ tcp_receive(pcb);
+ if (recv_flags & TF_GOT_FIN) {
+ if ((flags & TCP_ACK) && (ackno == pcb->snd_nxt)) {
+ LWIP_DEBUGF(TCP_DEBUG,
+ ("TCP connection closed: FIN_WAIT_1 %"U16_F" -> %"U16_F".\n", inseg.tcphdr->src, inseg.tcphdr->dest));
+ tcp_ack_now(pcb);
+ tcp_pcb_purge(pcb);
+ TCP_RMV(&tcp_active_pcbs, pcb);
+ pcb->state = TIME_WAIT;
+ TCP_REG(&tcp_tw_pcbs, pcb);
+ } else {
+ tcp_ack_now(pcb);
+ pcb->state = CLOSING;
+ }
+ } else if ((flags & TCP_ACK) && (ackno == pcb->snd_nxt)) {
+ pcb->state = FIN_WAIT_2;
+ }
+ break;
+ case FIN_WAIT_2:
+ tcp_receive(pcb);
+ if (recv_flags & TF_GOT_FIN) {
+ LWIP_DEBUGF(TCP_DEBUG, ("TCP connection closed: FIN_WAIT_2 %"U16_F" -> %"U16_F".\n", inseg.tcphdr->src, inseg.tcphdr->dest));
+ tcp_ack_now(pcb);
+ tcp_pcb_purge(pcb);
+ TCP_RMV(&tcp_active_pcbs, pcb);
+ pcb->state = TIME_WAIT;
+ TCP_REG(&tcp_tw_pcbs, pcb);
+ }
+ break;
+ case CLOSING:
+ tcp_receive(pcb);
+ if (flags & TCP_ACK && ackno == pcb->snd_nxt) {
+ LWIP_DEBUGF(TCP_DEBUG, ("TCP connection closed: CLOSING %"U16_F" -> %"U16_F".\n", inseg.tcphdr->src, inseg.tcphdr->dest));
+ tcp_pcb_purge(pcb);
+ TCP_RMV(&tcp_active_pcbs, pcb);
+ pcb->state = TIME_WAIT;
+ TCP_REG(&tcp_tw_pcbs, pcb);
+ }
+ break;
+ case LAST_ACK:
+ tcp_receive(pcb);
+ if (flags & TCP_ACK && ackno == pcb->snd_nxt) {
+ LWIP_DEBUGF(TCP_DEBUG, ("TCP connection closed: LAST_ACK %"U16_F" -> %"U16_F".\n", inseg.tcphdr->src, inseg.tcphdr->dest));
+ /* bugfix #21699: don't set pcb->state to CLOSED here or we risk leaking segments */
+ recv_flags |= TF_CLOSED;
+ }
+ break;
+ default:
+ break;
+ }
+ return ERR_OK;
+}
+
+#if TCP_QUEUE_OOSEQ
+/**
+ * Insert segment into the list (segments covered with new one will be deleted)
+ *
+ * Called from tcp_receive()
+ */
+static void
+tcp_oos_insert_segment(struct tcp_seg *cseg, struct tcp_seg *next)
+{
+ struct tcp_seg *old_seg;
+
+ if (TCPH_FLAGS(cseg->tcphdr) & TCP_FIN) {
+ /* received segment overlaps all following segments */
+ tcp_segs_free(next);
+ next = NULL;
+ }
+ else {
+ /* delete some following segments
+ oos queue may have segments with FIN flag */
+ while (next &&
+ TCP_SEQ_GEQ((seqno + cseg->len),
+ (next->tcphdr->seqno + next->len))) {
+ /* cseg with FIN already processed */
+ if (TCPH_FLAGS(next->tcphdr) & TCP_FIN) {
+ TCPH_SET_FLAG(cseg->tcphdr, TCP_FIN);
+ }
+ old_seg = next;
+ next = next->next;
+ tcp_seg_free(old_seg);
+ }
+ if (next &&
+ TCP_SEQ_GT(seqno + cseg->len, next->tcphdr->seqno)) {
+ /* We need to trim the incoming segment. */
+ cseg->len = (u16_t)(next->tcphdr->seqno - seqno);
+ pbuf_realloc(cseg->p, cseg->len);
+ }
+ }
+ cseg->next = next;
+}
+#endif /* TCP_QUEUE_OOSEQ */
+
+/**
+ * Called by tcp_process. Checks if the given segment is an ACK for outstanding
+ * data, and if so frees the memory of the buffered data. Next, is places the
+ * segment on any of the receive queues (pcb->recved or pcb->ooseq). If the segment
+ * is buffered, the pbuf is referenced by pbuf_ref so that it will not be freed until
+ * i it has been removed from the buffer.
+ *
+ * If the incoming segment constitutes an ACK for a segment that was used for RTT
+ * estimation, the RTT is estimated here as well.
+ *
+ * Called from tcp_process().
+ */
+static void
+tcp_receive(struct tcp_pcb *pcb)
+{
+ struct tcp_seg *next;
+#if TCP_QUEUE_OOSEQ
+ struct tcp_seg *prev, *cseg;
+#endif /* TCP_QUEUE_OOSEQ */
+ struct pbuf *p;
+ s32_t off;
+ s16_t m;
+ u32_t right_wnd_edge;
+ u16_t new_tot_len;
+ int found_dupack = 0;
+
+ if (flags & TCP_ACK) {
+ right_wnd_edge = pcb->snd_wnd + pcb->snd_wl2;
+
+ /* Update window. */
+ if (TCP_SEQ_LT(pcb->snd_wl1, seqno) ||
+ (pcb->snd_wl1 == seqno && TCP_SEQ_LT(pcb->snd_wl2, ackno)) ||
+ (pcb->snd_wl2 == ackno && tcphdr->wnd > pcb->snd_wnd)) {
+ pcb->snd_wnd = tcphdr->wnd;
+ pcb->snd_wl1 = seqno;
+ pcb->snd_wl2 = ackno;
+ if (pcb->snd_wnd > 0 && pcb->persist_backoff > 0) {
+ pcb->persist_backoff = 0;
+ }
+ LWIP_DEBUGF(TCP_WND_DEBUG, ("tcp_receive: window update %"U16_F"\n", pcb->snd_wnd));
+#if TCP_WND_DEBUG
+ } else {
+ if (pcb->snd_wnd != tcphdr->wnd) {
+ LWIP_DEBUGF(TCP_WND_DEBUG,
+ ("tcp_receive: no window update lastack %"U32_F" ackno %"
+ U32_F" wl1 %"U32_F" seqno %"U32_F" wl2 %"U32_F"\n",
+ pcb->lastack, ackno, pcb->snd_wl1, seqno, pcb->snd_wl2));
+ }
+#endif /* TCP_WND_DEBUG */
+ }
+
+ /* (From Stevens TCP/IP Illustrated Vol II, p970.) Its only a
+ * duplicate ack if:
+ * 1) It doesn't ACK new data
+ * 2) length of received packet is zero (i.e. no payload)
+ * 3) the advertised window hasn't changed
+ * 4) There is outstanding unacknowledged data (retransmission timer running)
+ * 5) The ACK is == biggest ACK sequence number so far seen (snd_una)
+ *
+ * If it passes all five, should process as a dupack:
+ * a) dupacks < 3: do nothing
+ * b) dupacks == 3: fast retransmit
+ * c) dupacks > 3: increase cwnd
+ *
+ * If it only passes 1-3, should reset dupack counter (and add to
+ * stats, which we don't do in lwIP)
+ *
+ * If it only passes 1, should reset dupack counter
+ *
+ */
+
+ /* Clause 1 */
+ if (TCP_SEQ_LEQ(ackno, pcb->lastack)) {
+ pcb->acked = 0;
+ /* Clause 2 */
+ if (tcplen == 0) {
+ /* Clause 3 */
+ if (pcb->snd_wl2 + pcb->snd_wnd == right_wnd_edge){
+ /* Clause 4 */
+ if (pcb->rtime >= 0) {
+ /* Clause 5 */
+ if (pcb->lastack == ackno) {
+ found_dupack = 1;
+ if (pcb->dupacks + 1 > pcb->dupacks)
+ ++pcb->dupacks;
+ if (pcb->dupacks > 3) {
+ /* Inflate the congestion window, but not if it means that
+ the value overflows. */
+ if ((u16_t)(pcb->cwnd + pcb->mss) > pcb->cwnd) {
+ pcb->cwnd += pcb->mss;
+ }
+ } else if (pcb->dupacks == 3) {
+ /* Do fast retransmit */
+ tcp_rexmit_fast(pcb);
+ }
+ }
+ }
+ }
+ }
+ /* If Clause (1) or more is true, but not a duplicate ack, reset
+ * count of consecutive duplicate acks */
+ if (!found_dupack) {
+ pcb->dupacks = 0;
+ }
+ } else if (TCP_SEQ_BETWEEN(ackno, pcb->lastack+1, pcb->snd_nxt)){
+ /* We come here when the ACK acknowledges new data. */
+
+ /* Reset the "IN Fast Retransmit" flag, since we are no longer
+ in fast retransmit. Also reset the congestion window to the
+ slow start threshold. */
+ if (pcb->flags & TF_INFR) {
+ pcb->flags &= ~TF_INFR;
+ pcb->cwnd = pcb->ssthresh;
+ }
+
+ /* Reset the number of retransmissions. */
+ pcb->nrtx = 0;
+
+ /* Reset the retransmission time-out. */
+ pcb->rto = (pcb->sa >> 3) + pcb->sv;
+
+ /* Update the send buffer space. Diff between the two can never exceed 64K? */
+ pcb->acked = (u16_t)(ackno - pcb->lastack);
+
+ pcb->snd_buf += pcb->acked;
+
+ /* Reset the fast retransmit variables. */
+ pcb->dupacks = 0;
+ pcb->lastack = ackno;
+
+ /* Update the congestion control variables (cwnd and
+ ssthresh). */
+ if (pcb->state >= ESTABLISHED) {
+ if (pcb->cwnd < pcb->ssthresh) {
+ if ((u16_t)(pcb->cwnd + pcb->mss) > pcb->cwnd) {
+ pcb->cwnd += pcb->mss;
+ }
+ LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_receive: slow start cwnd %"U16_F"\n", pcb->cwnd));
+ } else {
+ u16_t new_cwnd = (pcb->cwnd + pcb->mss * pcb->mss / pcb->cwnd);
+ if (new_cwnd > pcb->cwnd) {
+ pcb->cwnd = new_cwnd;
+ }
+ LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_receive: congestion avoidance cwnd %"U16_F"\n", pcb->cwnd));
+ }
+ }
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_receive: ACK for %"U32_F", unacked->seqno %"U32_F":%"U32_F"\n",
+ ackno,
+ pcb->unacked != NULL?
+ ntohl(pcb->unacked->tcphdr->seqno): 0,
+ pcb->unacked != NULL?
+ ntohl(pcb->unacked->tcphdr->seqno) + TCP_TCPLEN(pcb->unacked): 0));
+
+ /* Remove segment from the unacknowledged list if the incoming
+ ACK acknowlegdes them. */
+ while (pcb->unacked != NULL &&
+ TCP_SEQ_LEQ(ntohl(pcb->unacked->tcphdr->seqno) +
+ TCP_TCPLEN(pcb->unacked), ackno)) {
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_receive: removing %"U32_F":%"U32_F" from pcb->unacked\n",
+ ntohl(pcb->unacked->tcphdr->seqno),
+ ntohl(pcb->unacked->tcphdr->seqno) +
+ TCP_TCPLEN(pcb->unacked)));
+
+ next = pcb->unacked;
+ pcb->unacked = pcb->unacked->next;
+
+ LWIP_DEBUGF(TCP_QLEN_DEBUG, ("tcp_receive: queuelen %"U16_F" ... ", (u16_t)pcb->snd_queuelen));
+ LWIP_ASSERT("pcb->snd_queuelen >= pbuf_clen(next->p)", (pcb->snd_queuelen >= pbuf_clen(next->p)));
+ /* Prevent ACK for FIN to generate a sent event */
+ if ((pcb->acked != 0) && ((TCPH_FLAGS(next->tcphdr) & TCP_FIN) != 0)) {
+ pcb->acked--;
+ }
+
+ pcb->snd_queuelen -= pbuf_clen(next->p);
+ tcp_seg_free(next);
+
+ LWIP_DEBUGF(TCP_QLEN_DEBUG, ("%"U16_F" (after freeing unacked)\n", (u16_t)pcb->snd_queuelen));
+ if (pcb->snd_queuelen != 0) {
+ LWIP_ASSERT("tcp_receive: valid queue length", pcb->unacked != NULL ||
+ pcb->unsent != NULL);
+ }
+ }
+
+ /* If there's nothing left to acknowledge, stop the retransmit
+ timer, otherwise reset it to start again */
+ if(pcb->unacked == NULL)
+ pcb->rtime = -1;
+ else
+ pcb->rtime = 0;
+
+ pcb->polltmr = 0;
+ } else {
+ /* Fix bug bug #21582: out of sequence ACK, didn't really ack anything */
+ pcb->acked = 0;
+ }
+
+ /* We go through the ->unsent list to see if any of the segments
+ on the list are acknowledged by the ACK. This may seem
+ strange since an "unsent" segment shouldn't be acked. The
+ rationale is that lwIP puts all outstanding segments on the
+ ->unsent list after a retransmission, so these segments may
+ in fact have been sent once. */
+ while (pcb->unsent != NULL &&
+ TCP_SEQ_BETWEEN(ackno, ntohl(pcb->unsent->tcphdr->seqno) +
+ TCP_TCPLEN(pcb->unsent), pcb->snd_nxt)) {
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_receive: removing %"U32_F":%"U32_F" from pcb->unsent\n",
+ ntohl(pcb->unsent->tcphdr->seqno), ntohl(pcb->unsent->tcphdr->seqno) +
+ TCP_TCPLEN(pcb->unsent)));
+
+ next = pcb->unsent;
+ pcb->unsent = pcb->unsent->next;
+ LWIP_DEBUGF(TCP_QLEN_DEBUG, ("tcp_receive: queuelen %"U16_F" ... ", (u16_t)pcb->snd_queuelen));
+ LWIP_ASSERT("pcb->snd_queuelen >= pbuf_clen(next->p)", (pcb->snd_queuelen >= pbuf_clen(next->p)));
+ /* Prevent ACK for FIN to generate a sent event */
+ if ((pcb->acked != 0) && ((TCPH_FLAGS(next->tcphdr) & TCP_FIN) != 0)) {
+ pcb->acked--;
+ }
+ pcb->snd_queuelen -= pbuf_clen(next->p);
+ tcp_seg_free(next);
+ LWIP_DEBUGF(TCP_QLEN_DEBUG, ("%"U16_F" (after freeing unsent)\n", (u16_t)pcb->snd_queuelen));
+ if (pcb->snd_queuelen != 0) {
+ LWIP_ASSERT("tcp_receive: valid queue length",
+ pcb->unacked != NULL || pcb->unsent != NULL);
+ }
+ }
+ /* End of ACK for new data processing. */
+
+ LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_receive: pcb->rttest %"U32_F" rtseq %"U32_F" ackno %"U32_F"\n",
+ pcb->rttest, pcb->rtseq, ackno));
+
+ /* RTT estimation calculations. This is done by checking if the
+ incoming segment acknowledges the segment we use to take a
+ round-trip time measurement. */
+ if (pcb->rttest && TCP_SEQ_LT(pcb->rtseq, ackno)) {
+ /* diff between this shouldn't exceed 32K since this are tcp timer ticks
+ and a round-trip shouldn't be that long... */
+ m = (s16_t)(tcp_ticks - pcb->rttest);
+
+ LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_receive: experienced rtt %"U16_F" ticks (%"U16_F" msec).\n",
+ m, m * TCP_SLOW_INTERVAL));
+
+ /* This is taken directly from VJs original code in his paper */
+ m = m - (pcb->sa >> 3);
+ pcb->sa += m;
+ if (m < 0) {
+ m = -m;
+ }
+ m = m - (pcb->sv >> 2);
+ pcb->sv += m;
+ pcb->rto = (pcb->sa >> 3) + pcb->sv;
+
+ LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_receive: RTO %"U16_F" (%"U16_F" milliseconds)\n",
+ pcb->rto, pcb->rto * TCP_SLOW_INTERVAL));
+
+ pcb->rttest = 0;
+ }
+ }
+
+ /* If the incoming segment contains data, we must process it
+ further. */
+ if (tcplen > 0) {
+ /* This code basically does three things:
+
+ +) If the incoming segment contains data that is the next
+ in-sequence data, this data is passed to the application. This
+ might involve trimming the first edge of the data. The rcv_nxt
+ variable and the advertised window are adjusted.
+
+ +) If the incoming segment has data that is above the next
+ sequence number expected (->rcv_nxt), the segment is placed on
+ the ->ooseq queue. This is done by finding the appropriate
+ place in the ->ooseq queue (which is ordered by sequence
+ number) and trim the segment in both ends if needed. An
+ immediate ACK is sent to indicate that we received an
+ out-of-sequence segment.
+
+ +) Finally, we check if the first segment on the ->ooseq queue
+ now is in sequence (i.e., if rcv_nxt >= ooseq->seqno). If
+ rcv_nxt > ooseq->seqno, we must trim the first edge of the
+ segment on ->ooseq before we adjust rcv_nxt. The data in the
+ segments that are now on sequence are chained onto the
+ incoming segment so that we only need to call the application
+ once.
+ */
+
+ /* First, we check if we must trim the first edge. We have to do
+ this if the sequence number of the incoming segment is less
+ than rcv_nxt, and the sequence number plus the length of the
+ segment is larger than rcv_nxt. */
+ /* if (TCP_SEQ_LT(seqno, pcb->rcv_nxt)){
+ if (TCP_SEQ_LT(pcb->rcv_nxt, seqno + tcplen)) {*/
+ if (TCP_SEQ_BETWEEN(pcb->rcv_nxt, seqno + 1, seqno + tcplen - 1)){
+ /* Trimming the first edge is done by pushing the payload
+ pointer in the pbuf downwards. This is somewhat tricky since
+ we do not want to discard the full contents of the pbuf up to
+ the new starting point of the data since we have to keep the
+ TCP header which is present in the first pbuf in the chain.
+
+ What is done is really quite a nasty hack: the first pbuf in
+ the pbuf chain is pointed to by inseg.p. Since we need to be
+ able to deallocate the whole pbuf, we cannot change this
+ inseg.p pointer to point to any of the later pbufs in the
+ chain. Instead, we point the ->payload pointer in the first
+ pbuf to data in one of the later pbufs. We also set the
+ inseg.data pointer to point to the right place. This way, the
+ ->p pointer will still point to the first pbuf, but the
+ ->p->payload pointer will point to data in another pbuf.
+
+ After we are done with adjusting the pbuf pointers we must
+ adjust the ->data pointer in the seg and the segment
+ length.*/
+
+ off = pcb->rcv_nxt - seqno;
+ p = inseg.p;
+ LWIP_ASSERT("inseg.p != NULL", inseg.p);
+ LWIP_ASSERT("insane offset!", (off < 0x7fff));
+ if (inseg.p->len < off) {
+ LWIP_ASSERT("pbuf too short!", (((s32_t)inseg.p->tot_len) >= off));
+ new_tot_len = (u16_t)(inseg.p->tot_len - off);
+ while (p->len < off) {
+ off -= p->len;
+ /* KJM following line changed (with addition of new_tot_len var)
+ to fix bug #9076
+ inseg.p->tot_len -= p->len; */
+ p->tot_len = new_tot_len;
+ p->len = 0;
+ p = p->next;
+ }
+ if(pbuf_header(p, (s16_t)-off)) {
+ /* Do we need to cope with this failing? Assert for now */
+ LWIP_ASSERT("pbuf_header failed", 0);
+ }
+ } else {
+ if(pbuf_header(inseg.p, (s16_t)-off)) {
+ /* Do we need to cope with this failing? Assert for now */
+ LWIP_ASSERT("pbuf_header failed", 0);
+ }
+ }
+ inseg.len -= (u16_t)(pcb->rcv_nxt - seqno);
+ inseg.tcphdr->seqno = seqno = pcb->rcv_nxt;
+ }
+ else {
+ if (TCP_SEQ_LT(seqno, pcb->rcv_nxt)){
+ /* the whole segment is < rcv_nxt */
+ /* must be a duplicate of a packet that has already been correctly handled */
+
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_receive: duplicate seqno %"U32_F"\n", seqno));
+ tcp_ack_now(pcb);
+ }
+ }
+
+ /* The sequence number must be within the window (above rcv_nxt
+ and below rcv_nxt + rcv_wnd) in order to be further
+ processed. */
+ if (TCP_SEQ_BETWEEN(seqno, pcb->rcv_nxt,
+ pcb->rcv_nxt + pcb->rcv_wnd - 1)){
+ if (pcb->rcv_nxt == seqno) {
+ /* The incoming segment is the next in sequence. We check if
+ we have to trim the end of the segment and update rcv_nxt
+ and pass the data to the application. */
+ tcplen = TCP_TCPLEN(&inseg);
+
+ if (tcplen > pcb->rcv_wnd) {
+ LWIP_DEBUGF(TCP_INPUT_DEBUG,
+ ("tcp_receive: other end overran receive window"
+ "seqno %"U32_F" len %"U16_F" right edge %"U32_F"\n",
+ seqno, tcplen, pcb->rcv_nxt + pcb->rcv_wnd));
+ if (TCPH_FLAGS(inseg.tcphdr) & TCP_FIN) {
+ /* Must remove the FIN from the header as we're trimming
+ * that byte of sequence-space from the packet */
+ TCPH_FLAGS_SET(inseg.tcphdr, TCPH_FLAGS(inseg.tcphdr) &~ TCP_FIN);
+ }
+ /* Adjust length of segment to fit in the window. */
+ inseg.len = pcb->rcv_wnd;
+ if (TCPH_FLAGS(inseg.tcphdr) & TCP_SYN) {
+ inseg.len -= 1;
+ }
+ pbuf_realloc(inseg.p, inseg.len);
+ tcplen = TCP_TCPLEN(&inseg);
+ LWIP_ASSERT("tcp_receive: segment not trimmed correctly to rcv_wnd\n",
+ (seqno + tcplen) == (pcb->rcv_nxt + pcb->rcv_wnd));
+ }
+#if TCP_QUEUE_OOSEQ
+ /* Received in-sequence data, adjust ooseq data if:
+ - FIN has been received or
+ - inseq overlaps with ooseq */
+ if (pcb->ooseq != NULL) {
+ if (TCPH_FLAGS(inseg.tcphdr) & TCP_FIN) {
+ LWIP_DEBUGF(TCP_INPUT_DEBUG,
+ ("tcp_receive: received in-order FIN, binning ooseq queue\n"));
+ /* Received in-order FIN means anything that was received
+ * out of order must now have been received in-order, so
+ * bin the ooseq queue */
+ while (pcb->ooseq != NULL) {
+ struct tcp_seg *old_ooseq = pcb->ooseq;
+ pcb->ooseq = pcb->ooseq->next;
+ tcp_seg_free(old_ooseq);
+ }
+ }
+ else {
+ next = pcb->ooseq;
+ /* Remove all segments on ooseq that are covered by inseg already.
+ * FIN is copied from ooseq to inseg if present. */
+ while (next &&
+ TCP_SEQ_GEQ(seqno + tcplen,
+ next->tcphdr->seqno + next->len)) {
+ /* inseg cannot have FIN here (already processed above) */
+ if (TCPH_FLAGS(next->tcphdr) & TCP_FIN &&
+ (TCPH_FLAGS(inseg.tcphdr) & TCP_SYN) == 0) {
+ TCPH_SET_FLAG(inseg.tcphdr, TCP_FIN);
+ tcplen = TCP_TCPLEN(&inseg);
+ }
+ prev = next;
+ next = next->next;
+ tcp_seg_free(prev);
+ }
+ /* Now trim right side of inseg if it overlaps with the first
+ * segment on ooseq */
+ if (next &&
+ TCP_SEQ_GT(seqno + tcplen,
+ next->tcphdr->seqno)) {
+ /* inseg cannot have FIN here (already processed above) */
+ inseg.len = (u16_t)(next->tcphdr->seqno - seqno);
+ if (TCPH_FLAGS(inseg.tcphdr) & TCP_SYN) {
+ inseg.len -= 1;
+ }
+ pbuf_realloc(inseg.p, inseg.len);
+ tcplen = TCP_TCPLEN(&inseg);
+ LWIP_ASSERT("tcp_receive: segment not trimmed correctly to ooseq queue\n",
+ (seqno + tcplen) == next->tcphdr->seqno);
+ }
+ pcb->ooseq = next;
+ }
+ }
+#endif /* TCP_QUEUE_OOSEQ */
+
+ pcb->rcv_nxt = seqno + tcplen;
+
+ /* Update the receiver's (our) window. */
+ LWIP_ASSERT("tcp_receive: tcplen > rcv_wnd\n", pcb->rcv_wnd >= tcplen);
+ pcb->rcv_wnd -= tcplen;
+
+ tcp_update_rcv_ann_wnd(pcb);
+
+ /* If there is data in the segment, we make preparations to
+ pass this up to the application. The ->recv_data variable
+ is used for holding the pbuf that goes to the
+ application. The code for reassembling out-of-sequence data
+ chains its data on this pbuf as well.
+
+ If the segment was a FIN, we set the TF_GOT_FIN flag that will
+ be used to indicate to the application that the remote side has
+ closed its end of the connection. */
+ if (inseg.p->tot_len > 0) {
+ recv_data = inseg.p;
+ /* Since this pbuf now is the responsibility of the
+ application, we delete our reference to it so that we won't
+ (mistakingly) deallocate it. */
+ inseg.p = NULL;
+ }
+ if (TCPH_FLAGS(inseg.tcphdr) & TCP_FIN) {
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_receive: received FIN.\n"));
+ recv_flags |= TF_GOT_FIN;
+ }
+
+#if TCP_QUEUE_OOSEQ
+ /* We now check if we have segments on the ->ooseq queue that
+ are now in sequence. */
+ while (pcb->ooseq != NULL &&
+ pcb->ooseq->tcphdr->seqno == pcb->rcv_nxt) {
+
+ cseg = pcb->ooseq;
+ seqno = pcb->ooseq->tcphdr->seqno;
+
+ pcb->rcv_nxt += TCP_TCPLEN(cseg);
+ LWIP_ASSERT("tcp_receive: ooseq tcplen > rcv_wnd\n",
+ pcb->rcv_wnd >= TCP_TCPLEN(cseg));
+ pcb->rcv_wnd -= TCP_TCPLEN(cseg);
+
+ tcp_update_rcv_ann_wnd(pcb);
+
+ if (cseg->p->tot_len > 0) {
+ /* Chain this pbuf onto the pbuf that we will pass to
+ the application. */
+ if (recv_data) {
+ pbuf_cat(recv_data, cseg->p);
+ } else {
+ recv_data = cseg->p;
+ }
+ cseg->p = NULL;
+ }
+ if (TCPH_FLAGS(cseg->tcphdr) & TCP_FIN) {
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_receive: dequeued FIN.\n"));
+ recv_flags |= TF_GOT_FIN;
+ if (pcb->state == ESTABLISHED) { /* force passive close or we can move to active close */
+ pcb->state = CLOSE_WAIT;
+ }
+ }
+
+ pcb->ooseq = cseg->next;
+ tcp_seg_free(cseg);
+ }
+#endif /* TCP_QUEUE_OOSEQ */
+
+
+ /* Acknowledge the segment(s). */
+ tcp_ack(pcb);
+
+ } else {
+ /* We get here if the incoming segment is out-of-sequence. */
+ tcp_send_empty_ack(pcb);
+#if TCP_QUEUE_OOSEQ
+ /* We queue the segment on the ->ooseq queue. */
+ if (pcb->ooseq == NULL) {
+ pcb->ooseq = tcp_seg_copy(&inseg);
+ } else {
+ /* If the queue is not empty, we walk through the queue and
+ try to find a place where the sequence number of the
+ incoming segment is between the sequence numbers of the
+ previous and the next segment on the ->ooseq queue. That is
+ the place where we put the incoming segment. If needed, we
+ trim the second edges of the previous and the incoming
+ segment so that it will fit into the sequence.
+
+ If the incoming segment has the same sequence number as a
+ segment on the ->ooseq queue, we discard the segment that
+ contains less data. */
+
+ prev = NULL;
+ for(next = pcb->ooseq; next != NULL; next = next->next) {
+ if (seqno == next->tcphdr->seqno) {
+ /* The sequence number of the incoming segment is the
+ same as the sequence number of the segment on
+ ->ooseq. We check the lengths to see which one to
+ discard. */
+ if (inseg.len > next->len) {
+ /* The incoming segment is larger than the old
+ segment. We replace some segments with the new
+ one. */
+ cseg = tcp_seg_copy(&inseg);
+ if (cseg != NULL) {
+ if (prev != NULL) {
+ prev->next = cseg;
+ } else {
+ pcb->ooseq = cseg;
+ }
+ tcp_oos_insert_segment(cseg, next);
+ }
+ break;
+ } else {
+ /* Either the lenghts are the same or the incoming
+ segment was smaller than the old one; in either
+ case, we ditch the incoming segment. */
+ break;
+ }
+ } else {
+ if (prev == NULL) {
+ if (TCP_SEQ_LT(seqno, next->tcphdr->seqno)) {
+ /* The sequence number of the incoming segment is lower
+ than the sequence number of the first segment on the
+ queue. We put the incoming segment first on the
+ queue. */
+ cseg = tcp_seg_copy(&inseg);
+ if (cseg != NULL) {
+ pcb->ooseq = cseg;
+ tcp_oos_insert_segment(cseg, next);
+ }
+ break;
+ }
+ } else {
+ /*if (TCP_SEQ_LT(prev->tcphdr->seqno, seqno) &&
+ TCP_SEQ_LT(seqno, next->tcphdr->seqno)) {*/
+ if (TCP_SEQ_BETWEEN(seqno, prev->tcphdr->seqno+1, next->tcphdr->seqno-1)) {
+ /* The sequence number of the incoming segment is in
+ between the sequence numbers of the previous and
+ the next segment on ->ooseq. We trim trim the previous
+ segment, delete next segments that included in received segment
+ and trim received, if needed. */
+ cseg = tcp_seg_copy(&inseg);
+ if (cseg != NULL) {
+ if (TCP_SEQ_GT(prev->tcphdr->seqno + prev->len, seqno)) {
+ /* We need to trim the prev segment. */
+ prev->len = (u16_t)(seqno - prev->tcphdr->seqno);
+ pbuf_realloc(prev->p, prev->len);
+ }
+ prev->next = cseg;
+ tcp_oos_insert_segment(cseg, next);
+ }
+ break;
+ }
+ }
+ /* If the "next" segment is the last segment on the
+ ooseq queue, we add the incoming segment to the end
+ of the list. */
+ if (next->next == NULL &&
+ TCP_SEQ_GT(seqno, next->tcphdr->seqno)) {
+ if (TCPH_FLAGS(next->tcphdr) & TCP_FIN) {
+ /* segment "next" already contains all data */
+ break;
+ }
+ next->next = tcp_seg_copy(&inseg);
+ if (next->next != NULL) {
+ if (TCP_SEQ_GT(next->tcphdr->seqno + next->len, seqno)) {
+ /* We need to trim the last segment. */
+ next->len = (u16_t)(seqno - next->tcphdr->seqno);
+ pbuf_realloc(next->p, next->len);
+ }
+ /* check if the remote side overruns our receive window */
+ if ((u32_t)tcplen + seqno > pcb->rcv_nxt + (u32_t)pcb->rcv_wnd) {
+ LWIP_DEBUGF(TCP_INPUT_DEBUG,
+ ("tcp_receive: other end overran receive window"
+ "seqno %"U32_F" len %"U16_F" right edge %"U32_F"\n",
+ seqno, tcplen, pcb->rcv_nxt + pcb->rcv_wnd));
+ if (TCPH_FLAGS(next->next->tcphdr) & TCP_FIN) {
+ /* Must remove the FIN from the header as we're trimming
+ * that byte of sequence-space from the packet */
+ TCPH_FLAGS_SET(next->next->tcphdr, TCPH_FLAGS(next->next->tcphdr) &~ TCP_FIN);
+ }
+ /* Adjust length of segment to fit in the window. */
+ next->next->len = pcb->rcv_nxt + pcb->rcv_wnd - seqno;
+ pbuf_realloc(next->next->p, next->next->len);
+ tcplen = TCP_TCPLEN(next->next);
+ LWIP_ASSERT("tcp_receive: segment not trimmed correctly to rcv_wnd\n",
+ (seqno + tcplen) == (pcb->rcv_nxt + pcb->rcv_wnd));
+ }
+ }
+ break;
+ }
+ }
+ prev = next;
+ }
+ }
+#endif /* TCP_QUEUE_OOSEQ */
+
+ }
+ } else {
+ /* The incoming segment is not withing the window. */
+ tcp_send_empty_ack(pcb);
+ }
+ } else {
+ /* Segments with length 0 is taken care of here. Segments that
+ fall out of the window are ACKed. */
+ /*if (TCP_SEQ_GT(pcb->rcv_nxt, seqno) ||
+ TCP_SEQ_GEQ(seqno, pcb->rcv_nxt + pcb->rcv_wnd)) {*/
+ if(!TCP_SEQ_BETWEEN(seqno, pcb->rcv_nxt, pcb->rcv_nxt + pcb->rcv_wnd-1)){
+ tcp_ack_now(pcb);
+ }
+ }
+}
+
+/**
+ * Parses the options contained in the incoming segment.
+ *
+ * Called from tcp_listen_input() and tcp_process().
+ * Currently, only the MSS option is supported!
+ *
+ * @param pcb the tcp_pcb for which a segment arrived
+ */
+static void
+tcp_parseopt(struct tcp_pcb *pcb)
+{
+ u16_t c, max_c;
+ u16_t mss;
+ u8_t *opts, opt;
+#if LWIP_TCP_TIMESTAMPS
+ u32_t tsval;
+#endif
+
+ opts = (u8_t *)tcphdr + TCP_HLEN;
+
+ /* Parse the TCP MSS option, if present. */
+ if(TCPH_HDRLEN(tcphdr) > 0x5) {
+ max_c = (TCPH_HDRLEN(tcphdr) - 5) << 2;
+ for (c = 0; c < max_c; ) {
+ opt = opts[c];
+ switch (opt) {
+ case 0x00:
+ /* End of options. */
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_parseopt: EOL\n"));
+ return;
+ case 0x01:
+ /* NOP option. */
+ ++c;
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_parseopt: NOP\n"));
+ break;
+ case 0x02:
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_parseopt: MSS\n"));
+ if (opts[c + 1] != 0x04 || c + 0x04 > max_c) {
+ /* Bad length */
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_parseopt: bad length\n"));
+ return;
+ }
+ /* An MSS option with the right option length. */
+ mss = (opts[c + 2] << 8) | opts[c + 3];
+ /* Limit the mss to the configured TCP_MSS and prevent division by zero */
+ pcb->mss = ((mss > TCP_MSS) || (mss == 0)) ? TCP_MSS : mss;
+ /* Advance to next option */
+ c += 0x04;
+ break;
+#if LWIP_TCP_TIMESTAMPS
+ case 0x08:
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_parseopt: TS\n"));
+ if (opts[c + 1] != 0x0A || c + 0x0A > max_c) {
+ /* Bad length */
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_parseopt: bad length\n"));
+ return;
+ }
+ /* TCP timestamp option with valid length */
+ tsval = (opts[c+2]) | (opts[c+3] << 8) |
+ (opts[c+4] << 16) | (opts[c+5] << 24);
+ if (flags & TCP_SYN) {
+ pcb->ts_recent = ntohl(tsval);
+ pcb->flags |= TF_TIMESTAMP;
+ } else if (TCP_SEQ_BETWEEN(pcb->ts_lastacksent, seqno, seqno+tcplen)) {
+ pcb->ts_recent = ntohl(tsval);
+ }
+ /* Advance to next option */
+ c += 0x0A;
+ break;
+#endif
+ default:
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_parseopt: other\n"));
+ if (opts[c + 1] == 0) {
+ LWIP_DEBUGF(TCP_INPUT_DEBUG, ("tcp_parseopt: bad length\n"));
+ /* If the length field is zero, the options are malformed
+ and we don't process them further. */
+ return;
+ }
+ /* All other options have a length field, so that we easily
+ can skip past them. */
+ c += opts[c + 1];
+ }
+ }
+ }
+}
+
+#endif /* LWIP_TCP */
--- /dev/null
+/**
+ * @file
+ * Transmission Control Protocol, outgoing traffic
+ *
+ * The output functions of TCP.
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/tcp_impl.h"
+#include "lwip/def.h"
+#include "lwip/mem.h"
+#include "lwip/memp.h"
+#include "lwip/sys.h"
+#include "lwip/ip_addr.h"
+#include "lwip/netif.h"
+#include "lwip/inet_chksum.h"
+#include "lwip/stats.h"
+#include "lwip/snmp.h"
+
+#include <string.h>
+
+/* Define some copy-macros for checksum-on-copy so that the code looks
+ nicer by preventing too many ifdef's. */
+#if TCP_CHECKSUM_ON_COPY
+#define TCP_DATA_COPY(dst, src, len, seg) do { \
+ tcp_seg_add_chksum(LWIP_CHKSUM_COPY(dst, src, len), \
+ len, &seg->chksum, &seg->chksum_swapped); \
+ seg->flags |= TF_SEG_DATA_CHECKSUMMED; } while(0)
+#define TCP_DATA_COPY2(dst, src, len, chksum, chksum_swapped) \
+ tcp_seg_add_chksum(LWIP_CHKSUM_COPY(dst, src, len), len, chksum, chksum_swapped);
+#else /* TCP_CHECKSUM_ON_COPY*/
+#define TCP_DATA_COPY(dst, src, len, seg) MEMCPY(dst, src, len)
+#define TCP_DATA_COPY2(dst, src, len, chksum, chksum_swapped) MEMCPY(dst, src, len)
+#endif /* TCP_CHECKSUM_ON_COPY*/
+
+/** Define this to 1 for an extra check that the output checksum is valid
+ * (usefule when the checksum is generated by the application, not the stack) */
+#ifndef TCP_CHECKSUM_ON_COPY_SANITY_CHECK
+#define TCP_CHECKSUM_ON_COPY_SANITY_CHECK 0
+#endif
+
+/* Forward declarations.*/
+static void tcp_output_segment(struct tcp_seg *seg, struct tcp_pcb *pcb);
+
+/** Allocate a pbuf and create a tcphdr at p->payload, used for output
+ * functions other than the default tcp_output -> tcp_output_segment
+ * (e.g. tcp_send_empty_ack, etc.)
+ *
+ * @param pcb tcp pcb for which to send a packet (used to initialize tcp_hdr)
+ * @param optlen length of header-options
+ * @param datalen length of tcp data to reserve in pbuf
+ * @param seqno_be seqno in network byte order (big-endian)
+ * @return pbuf with p->payload being the tcp_hdr
+ */
+static struct pbuf *
+tcp_output_alloc_header(struct tcp_pcb *pcb, u16_t optlen, u16_t datalen,
+ u32_t seqno_be /* already in network byte order */)
+{
+ struct tcp_hdr *tcphdr;
+ struct pbuf *p = pbuf_alloc(PBUF_IP, TCP_HLEN + optlen + datalen, PBUF_RAM);
+ if (p != NULL) {
+ LWIP_ASSERT("check that first pbuf can hold struct tcp_hdr",
+ (p->len >= TCP_HLEN + optlen));
+ tcphdr = (struct tcp_hdr *)p->payload;
+ tcphdr->src = htons(pcb->local_port);
+ tcphdr->dest = htons(pcb->remote_port);
+ tcphdr->seqno = seqno_be;
+ tcphdr->ackno = htonl(pcb->rcv_nxt);
+ TCPH_HDRLEN_FLAGS_SET(tcphdr, (5 + optlen / 4), TCP_ACK);
+ tcphdr->wnd = htons(pcb->rcv_ann_wnd);
+ tcphdr->chksum = 0;
+ tcphdr->urgp = 0;
+
+ /* If we're sending a packet, update the announced right window edge */
+ pcb->rcv_ann_right_edge = pcb->rcv_nxt + pcb->rcv_ann_wnd;
+ }
+ return p;
+}
+
+/**
+ * Called by tcp_close() to send a segment including FIN flag but not data.
+ *
+ * @param pcb the tcp_pcb over which to send a segment
+ * @return ERR_OK if sent, another err_t otherwise
+ */
+err_t
+tcp_send_fin(struct tcp_pcb *pcb)
+{
+ /* first, try to add the fin to the last unsent segment */
+ if (pcb->unsent != NULL) {
+ struct tcp_seg *last_unsent;
+ for (last_unsent = pcb->unsent; last_unsent->next != NULL;
+ last_unsent = last_unsent->next);
+
+ if ((TCPH_FLAGS(last_unsent->tcphdr) & (TCP_SYN | TCP_FIN | TCP_RST)) == 0) {
+ /* no SYN/FIN/RST flag in the header, we can add the FIN flag */
+ TCPH_SET_FLAG(last_unsent->tcphdr, TCP_FIN);
+ return ERR_OK;
+ }
+ }
+ /* no data, no length, flags, copy=1, no optdata */
+ return tcp_enqueue_flags(pcb, TCP_FIN);
+}
+
+/**
+ * Create a TCP segment with prefilled header.
+ *
+ * Called by tcp_write and tcp_enqueue_flags.
+ *
+ * @param pcb Protocol control block for the TCP connection.
+ * @param p pbuf that is used to hold the TCP header.
+ * @param flags TCP flags for header.
+ * @param seqno TCP sequence number of this packet
+ * @param optflags options to include in TCP header
+ * @return a new tcp_seg pointing to p, or NULL.
+ * The TCP header is filled in except ackno and wnd.
+ * p is freed on failure.
+ */
+static struct tcp_seg *
+tcp_create_segment(struct tcp_pcb *pcb, struct pbuf *p, u8_t flags, u32_t seqno, u8_t optflags)
+{
+ struct tcp_seg *seg;
+ u8_t optlen = LWIP_TCP_OPT_LENGTH(optflags);
+
+ if ((seg = (struct tcp_seg *)memp_malloc(MEMP_TCP_SEG)) == NULL) {
+ LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 2, ("tcp_create_segment: no memory.\n"));
+ pbuf_free(p);
+ return NULL;
+ }
+ seg->flags = optflags;
+ seg->next = NULL;
+ seg->p = p;
+ seg->len = p->tot_len - optlen;
+#if TCP_OVERSIZE_DBGCHECK
+ seg->oversize_left = 0;
+#endif /* TCP_OVERSIZE_DBGCHECK */
+#if TCP_CHECKSUM_ON_COPY
+ seg->chksum = 0;
+ seg->chksum_swapped = 0;
+ /* check optflags */
+ LWIP_ASSERT("invalid optflags passed: TF_SEG_DATA_CHECKSUMMED",
+ (optflags & TF_SEG_DATA_CHECKSUMMED) == 0);
+#endif /* TCP_CHECKSUM_ON_COPY */
+
+ /* build TCP header */
+ if (pbuf_header(p, TCP_HLEN)) {
+ LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 2, ("tcp_create_segment: no room for TCP header in pbuf.\n"));
+ TCP_STATS_INC(tcp.err);
+ tcp_seg_free(seg);
+ return NULL;
+ }
+ seg->tcphdr = (struct tcp_hdr *)seg->p->payload;
+ seg->tcphdr->src = htons(pcb->local_port);
+ seg->tcphdr->dest = htons(pcb->remote_port);
+ seg->tcphdr->seqno = htonl(seqno);
+ /* ackno is set in tcp_output */
+ TCPH_HDRLEN_FLAGS_SET(seg->tcphdr, (5 + optlen / 4), flags);
+ /* wnd and chksum are set in tcp_output */
+ seg->tcphdr->urgp = 0;
+ return seg;
+}
+
+/**
+ * Allocate a PBUF_RAM pbuf, perhaps with extra space at the end.
+ *
+ * This function is like pbuf_alloc(layer, length, PBUF_RAM) except
+ * there may be extra bytes available at the end.
+ *
+ * @param layer flag to define header size.
+ * @param length size of the pbuf's payload.
+ * @param max_length maximum usable size of payload+oversize.
+ * @param oversize pointer to a u16_t that will receive the number of usable tail bytes.
+ * @param pcb The TCP connection that willo enqueue the pbuf.
+ * @param apiflags API flags given to tcp_write.
+ * @param first_seg true when this pbuf will be used in the first enqueued segment.
+ * @param
+ */
+#if TCP_OVERSIZE
+static struct pbuf *
+tcp_pbuf_prealloc(pbuf_layer layer, u16_t length, u16_t max_length,
+ u16_t *oversize, struct tcp_pcb *pcb, u8_t apiflags,
+ u8_t first_seg)
+{
+ struct pbuf *p;
+ u16_t alloc = length;
+
+#if LWIP_NETIF_TX_SINGLE_PBUF
+ LWIP_UNUSED_ARG(max_length);
+ LWIP_UNUSED_ARG(pcb);
+ LWIP_UNUSED_ARG(apiflags);
+ LWIP_UNUSED_ARG(first_seg);
+ /* always create MSS-sized pbufs */
+ alloc = TCP_MSS;
+#else /* LWIP_NETIF_TX_SINGLE_PBUF */
+ if (length < max_length) {
+ /* Should we allocate an oversized pbuf, or just the minimum
+ * length required? If tcp_write is going to be called again
+ * before this segment is transmitted, we want the oversized
+ * buffer. If the segment will be transmitted immediately, we can
+ * save memory by allocating only length. We use a simple
+ * heuristic based on the following information:
+ *
+ * Did the user set TCP_WRITE_FLAG_MORE?
+ *
+ * Will the Nagle algorithm defer transmission of this segment?
+ */
+ if ((apiflags & TCP_WRITE_FLAG_MORE) ||
+ (!(pcb->flags & TF_NODELAY) &&
+ (!first_seg ||
+ pcb->unsent != NULL ||
+ pcb->unacked != NULL))) {
+ alloc = LWIP_MIN(max_length, LWIP_MEM_ALIGN_SIZE(length + TCP_OVERSIZE));
+ }
+ }
+#endif /* LWIP_NETIF_TX_SINGLE_PBUF */
+ p = pbuf_alloc(layer, alloc, PBUF_RAM);
+ if (p == NULL) {
+ return NULL;
+ }
+ LWIP_ASSERT("need unchained pbuf", p->next == NULL);
+ *oversize = p->len - length;
+ /* trim p->len to the currently used size */
+ p->len = p->tot_len = length;
+ return p;
+}
+#else /* TCP_OVERSIZE */
+#define tcp_pbuf_prealloc(layer, length, mx, os, pcb, api, fst) pbuf_alloc((layer), (length), PBUF_RAM)
+#endif /* TCP_OVERSIZE */
+
+#if TCP_CHECKSUM_ON_COPY
+/** Add a checksum of newly added data to the segment */
+static void
+tcp_seg_add_chksum(u16_t chksum, u16_t len, u16_t *seg_chksum,
+ u8_t *seg_chksum_swapped)
+{
+ u32_t helper;
+ /* add chksum to old chksum and fold to u16_t */
+ helper = chksum + *seg_chksum;
+ chksum = FOLD_U32T(helper);
+ if ((len & 1) != 0) {
+ *seg_chksum_swapped = 1 - *seg_chksum_swapped;
+ chksum = SWAP_BYTES_IN_WORD(chksum);
+ }
+ *seg_chksum = chksum;
+}
+#endif /* TCP_CHECKSUM_ON_COPY */
+
+/** Checks if tcp_write is allowed or not (checks state, snd_buf and snd_queuelen).
+ *
+ * @param pcb the tcp pcb to check for
+ * @param len length of data to send (checked agains snd_buf)
+ * @return ERR_OK if tcp_write is allowed to proceed, another err_t otherwise
+ */
+static err_t
+tcp_write_checks(struct tcp_pcb *pcb, u16_t len)
+{
+ /* connection is in invalid state for data transmission? */
+ if ((pcb->state != ESTABLISHED) &&
+ (pcb->state != CLOSE_WAIT) &&
+ (pcb->state != SYN_SENT) &&
+ (pcb->state != SYN_RCVD)) {
+ LWIP_DEBUGF(TCP_OUTPUT_DEBUG | LWIP_DBG_STATE | LWIP_DBG_LEVEL_SEVERE, ("tcp_write() called in invalid state\n"));
+ return ERR_CONN;
+ } else if (len == 0) {
+ return ERR_OK;
+ }
+
+ /* fail on too much data */
+ if (len > pcb->snd_buf) {
+ LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 3, ("tcp_write: too much data (len=%"U16_F" > snd_buf=%"U16_F")\n",
+ len, pcb->snd_buf));
+ pcb->flags |= TF_NAGLEMEMERR;
+ return ERR_MEM;
+ }
+
+ LWIP_DEBUGF(TCP_QLEN_DEBUG, ("tcp_write: queuelen: %"U16_F"\n", (u16_t)pcb->snd_queuelen));
+
+ /* If total number of pbufs on the unsent/unacked queues exceeds the
+ * configured maximum, return an error */
+ /* check for configured max queuelen and possible overflow */
+ if ((pcb->snd_queuelen >= TCP_SND_QUEUELEN) || (pcb->snd_queuelen > TCP_SNDQUEUELEN_OVERFLOW)) {
+ LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 3, ("tcp_write: too long queue %"U16_F" (max %"U16_F")\n",
+ pcb->snd_queuelen, TCP_SND_QUEUELEN));
+ TCP_STATS_INC(tcp.memerr);
+ pcb->flags |= TF_NAGLEMEMERR;
+ return ERR_MEM;
+ }
+ if (pcb->snd_queuelen != 0) {
+ LWIP_ASSERT("tcp_write: pbufs on queue => at least one queue non-empty",
+ pcb->unacked != NULL || pcb->unsent != NULL);
+ } else {
+ LWIP_ASSERT("tcp_write: no pbufs on queue => both queues empty",
+ pcb->unacked == NULL && pcb->unsent == NULL);
+ }
+ return ERR_OK;
+}
+
+/**
+ * Write data for sending (but does not send it immediately).
+ *
+ * It waits in the expectation of more data being sent soon (as
+ * it can send them more efficiently by combining them together).
+ * To prompt the system to send data now, call tcp_output() after
+ * calling tcp_write().
+ *
+ * @param pcb Protocol control block for the TCP connection to enqueue data for.
+ * @param arg Pointer to the data to be enqueued for sending.
+ * @param len Data length in bytes
+ * @param apiflags combination of following flags :
+ * - TCP_WRITE_FLAG_COPY (0x01) data will be copied into memory belonging to the stack
+ * - TCP_WRITE_FLAG_MORE (0x02) for TCP connection, PSH flag will be set on last segment sent,
+ * @return ERR_OK if enqueued, another err_t on error
+ */
+err_t
+tcp_write(struct tcp_pcb *pcb, const void *arg, u16_t len, u8_t apiflags)
+{
+ struct pbuf *concat_p = NULL;
+ struct tcp_seg *last_unsent = NULL, *seg = NULL, *prev_seg = NULL, *queue = NULL;
+ u16_t pos = 0; /* position in 'arg' data */
+ u16_t queuelen;
+ u8_t optlen = 0;
+ u8_t optflags = 0;
+#if TCP_OVERSIZE
+ u16_t oversize = 0;
+ u16_t oversize_used = 0;
+#endif /* TCP_OVERSIZE */
+#if TCP_CHECKSUM_ON_COPY
+ u16_t concat_chksum = 0;
+ u8_t concat_chksum_swapped = 0;
+ u16_t concat_chksummed = 0;
+#endif /* TCP_CHECKSUM_ON_COPY */
+ err_t err;
+
+#if LWIP_NETIF_TX_SINGLE_PBUF
+ /* Always copy to try to create single pbufs for TX */
+ apiflags |= TCP_WRITE_FLAG_COPY;
+#endif /* LWIP_NETIF_TX_SINGLE_PBUF */
+
+ LWIP_DEBUGF(TCP_OUTPUT_DEBUG, ("tcp_write(pcb=%p, data=%p, len=%"U16_F", apiflags=%"U16_F")\n",
+ (void *)pcb, arg, len, (u16_t)apiflags));
+ LWIP_ERROR("tcp_write: arg == NULL (programmer violates API)",
+ arg != NULL, return ERR_ARG;);
+
+ err = tcp_write_checks(pcb, len);
+ if (err != ERR_OK) {
+ return err;
+ }
+ queuelen = pcb->snd_queuelen;
+
+#if LWIP_TCP_TIMESTAMPS
+ if ((pcb->flags & TF_TIMESTAMP)) {
+ optflags = TF_SEG_OPTS_TS;
+ optlen = LWIP_TCP_OPT_LENGTH(TF_SEG_OPTS_TS);
+ }
+#endif /* LWIP_TCP_TIMESTAMPS */
+
+
+ /*
+ * TCP segmentation is done in three phases with increasing complexity:
+ *
+ * 1. Copy data directly into an oversized pbuf.
+ * 2. Chain a new pbuf to the end of pcb->unsent.
+ * 3. Create new segments.
+ *
+ * We may run out of memory at any point. In that case we must
+ * return ERR_MEM and not change anything in pcb. Therefore, all
+ * changes are recorded in local variables and committed at the end
+ * of the function. Some pcb fields are maintained in local copies:
+ *
+ * queuelen = pcb->snd_queuelen
+ * oversize = pcb->unsent_oversize
+ *
+ * These variables are set consistently by the phases:
+ *
+ * seg points to the last segment tampered with.
+ *
+ * pos records progress as data is segmented.
+ */
+
+ /* Find the tail of the unsent queue. */
+ if (pcb->unsent != NULL) {
+ u16_t space;
+ u16_t unsent_optlen;
+
+ /* @todo: this could be sped up by keeping last_unsent in the pcb */
+ for (last_unsent = pcb->unsent; last_unsent->next != NULL;
+ last_unsent = last_unsent->next);
+
+ /* Usable space at the end of the last unsent segment */
+ unsent_optlen = LWIP_TCP_OPT_LENGTH(last_unsent->flags);
+ space = pcb->mss - (last_unsent->len + unsent_optlen);
+
+ /*
+ * Phase 1: Copy data directly into an oversized pbuf.
+ *
+ * The number of bytes copied is recorded in the oversize_used
+ * variable. The actual copying is done at the bottom of the
+ * function.
+ */
+#if TCP_OVERSIZE
+#if TCP_OVERSIZE_DBGCHECK
+ /* check that pcb->unsent_oversize matches last_unsent->unsent_oversize */
+ LWIP_ASSERT("unsent_oversize mismatch (pcb vs. last_unsent)",
+ pcb->unsent_oversize == last_unsent->oversize_left);
+#endif /* TCP_OVERSIZE_DBGCHECK */
+ oversize = pcb->unsent_oversize;
+ if (oversize > 0) {
+ LWIP_ASSERT("inconsistent oversize vs. space", oversize_used <= space);
+ seg = last_unsent;
+ oversize_used = oversize < len ? oversize : len;
+ pos += oversize_used;
+ oversize -= oversize_used;
+ space -= oversize_used;
+ }
+ /* now we are either finished or oversize is zero */
+ LWIP_ASSERT("inconsistend oversize vs. len", (oversize == 0) || (pos == len));
+#endif /* TCP_OVERSIZE */
+
+ /*
+ * Phase 2: Chain a new pbuf to the end of pcb->unsent.
+ *
+ * We don't extend segments containing SYN/FIN flags or options
+ * (len==0). The new pbuf is kept in concat_p and pbuf_cat'ed at
+ * the end.
+ */
+ if ((pos < len) && (space > 0) && (last_unsent->len > 0)) {
+ u16_t seglen = space < len - pos ? space : len - pos;
+ seg = last_unsent;
+
+ /* Create a pbuf with a copy or reference to seglen bytes. We
+ * can use PBUF_RAW here since the data appears in the middle of
+ * a segment. A header will never be prepended. */
+ if (apiflags & TCP_WRITE_FLAG_COPY) {
+ /* Data is copied */
+ if ((concat_p = tcp_pbuf_prealloc(PBUF_RAW, seglen, space, &oversize, pcb, apiflags, 1)) == NULL) {
+ LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 2,
+ ("tcp_write : could not allocate memory for pbuf copy size %"U16_F"\n",
+ seglen));
+ goto memerr;
+ }
+#if TCP_OVERSIZE_DBGCHECK
+ last_unsent->oversize_left = oversize;
+#endif /* TCP_OVERSIZE_DBGCHECK */
+ TCP_DATA_COPY2(concat_p->payload, (u8_t*)arg + pos, seglen, &concat_chksum, &concat_chksum_swapped);
+#if TCP_CHECKSUM_ON_COPY
+ concat_chksummed += seglen;
+#endif /* TCP_CHECKSUM_ON_COPY */
+ } else {
+ /* Data is not copied */
+ if ((concat_p = pbuf_alloc(PBUF_RAW, seglen, PBUF_ROM)) == NULL) {
+ LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 2,
+ ("tcp_write: could not allocate memory for zero-copy pbuf\n"));
+ goto memerr;
+ }
+#if TCP_CHECKSUM_ON_COPY
+ /* calculate the checksum of nocopy-data */
+ tcp_seg_add_chksum(~inet_chksum((u8_t*)arg + pos, seglen), seglen,
+ &concat_chksum, &concat_chksum_swapped);
+ concat_chksummed += seglen;
+#endif /* TCP_CHECKSUM_ON_COPY */
+ /* reference the non-volatile payload data */
+ concat_p->payload = (u8_t*)arg + pos;
+ }
+
+ pos += seglen;
+ queuelen += pbuf_clen(concat_p);
+ }
+ } else {
+#if TCP_OVERSIZE
+ LWIP_ASSERT("unsent_oversize mismatch (pcb->unsent is NULL)",
+ pcb->unsent_oversize == 0);
+#endif /* TCP_OVERSIZE */
+ }
+
+ /*
+ * Phase 3: Create new segments.
+ *
+ * The new segments are chained together in the local 'queue'
+ * variable, ready to be appended to pcb->unsent.
+ */
+ while (pos < len) {
+ struct pbuf *p;
+ u16_t left = len - pos;
+ u16_t max_len = pcb->mss - optlen;
+ u16_t seglen = left > max_len ? max_len : left;
+#if TCP_CHECKSUM_ON_COPY
+ u16_t chksum = 0;
+ u8_t chksum_swapped = 0;
+#endif /* TCP_CHECKSUM_ON_COPY */
+
+ if (apiflags & TCP_WRITE_FLAG_COPY) {
+ /* If copy is set, memory should be allocated and data copied
+ * into pbuf */
+ if ((p = tcp_pbuf_prealloc(PBUF_TRANSPORT, seglen + optlen, pcb->mss, &oversize, pcb, apiflags, queue == NULL)) == NULL) {
+ LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 2, ("tcp_write : could not allocate memory for pbuf copy size %"U16_F"\n", seglen));
+ goto memerr;
+ }
+ LWIP_ASSERT("tcp_write: check that first pbuf can hold the complete seglen",
+ (p->len >= seglen));
+ TCP_DATA_COPY2((char *)p->payload + optlen, (u8_t*)arg + pos, seglen, &chksum, &chksum_swapped);
+ } else {
+ /* Copy is not set: First allocate a pbuf for holding the data.
+ * Since the referenced data is available at least until it is
+ * sent out on the link (as it has to be ACKed by the remote
+ * party) we can safely use PBUF_ROM instead of PBUF_REF here.
+ */
+ struct pbuf *p2;
+#if TCP_OVERSIZE
+ LWIP_ASSERT("oversize == 0", oversize == 0);
+#endif /* TCP_OVERSIZE */
+ if ((p2 = pbuf_alloc(PBUF_TRANSPORT, seglen, PBUF_ROM)) == NULL) {
+ LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 2, ("tcp_write: could not allocate memory for zero-copy pbuf\n"));
+ goto memerr;
+ }
+#if TCP_CHECKSUM_ON_COPY
+ /* calculate the checksum of nocopy-data */
+ chksum = ~inet_chksum((u8_t*)arg + pos, seglen);
+#endif /* TCP_CHECKSUM_ON_COPY */
+ /* reference the non-volatile payload data */
+ p2->payload = (u8_t*)arg + pos;
+
+ /* Second, allocate a pbuf for the headers. */
+ if ((p = pbuf_alloc(PBUF_TRANSPORT, optlen, PBUF_RAM)) == NULL) {
+ /* If allocation fails, we have to deallocate the data pbuf as
+ * well. */
+ pbuf_free(p2);
+ LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 2, ("tcp_write: could not allocate memory for header pbuf\n"));
+ goto memerr;
+ }
+ /* Concatenate the headers and data pbufs together. */
+ pbuf_cat(p/*header*/, p2/*data*/);
+ }
+
+ queuelen += pbuf_clen(p);
+
+ /* Now that there are more segments queued, we check again if the
+ * length of the queue exceeds the configured maximum or
+ * overflows. */
+ if ((queuelen > TCP_SND_QUEUELEN) || (queuelen > TCP_SNDQUEUELEN_OVERFLOW)) {
+ LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 2, ("tcp_write: queue too long %"U16_F" (%"U16_F")\n", queuelen, TCP_SND_QUEUELEN));
+ pbuf_free(p);
+ goto memerr;
+ }
+
+ if ((seg = tcp_create_segment(pcb, p, 0, pcb->snd_lbb + pos, optflags)) == NULL) {
+ goto memerr;
+ }
+#if TCP_OVERSIZE_DBGCHECK
+ seg->oversize_left = oversize;
+#endif /* TCP_OVERSIZE_DBGCHECK */
+#if TCP_CHECKSUM_ON_COPY
+ seg->chksum = chksum;
+ seg->chksum_swapped = chksum_swapped;
+ seg->flags |= TF_SEG_DATA_CHECKSUMMED;
+#endif /* TCP_CHECKSUM_ON_COPY */
+
+ /* first segment of to-be-queued data? */
+ if (queue == NULL) {
+ queue = seg;
+ } else {
+ /* Attach the segment to the end of the queued segments */
+ LWIP_ASSERT("prev_seg != NULL", prev_seg != NULL);
+ prev_seg->next = seg;
+ }
+ /* remember last segment of to-be-queued data for next iteration */
+ prev_seg = seg;
+
+ LWIP_DEBUGF(TCP_OUTPUT_DEBUG | LWIP_DBG_TRACE, ("tcp_write: queueing %"U32_F":%"U32_F"\n",
+ ntohl(seg->tcphdr->seqno),
+ ntohl(seg->tcphdr->seqno) + TCP_TCPLEN(seg)));
+
+ pos += seglen;
+ }
+
+ /*
+ * All three segmentation phases were successful. We can commit the
+ * transaction.
+ */
+
+ /*
+ * Phase 1: If data has been added to the preallocated tail of
+ * last_unsent, we update the length fields of the pbuf chain.
+ */
+#if TCP_OVERSIZE
+ if (oversize_used > 0) {
+ struct pbuf *p;
+ /* Bump tot_len of whole chain, len of tail */
+ for (p = last_unsent->p; p; p = p->next) {
+ p->tot_len += oversize_used;
+ if (p->next == NULL) {
+ TCP_DATA_COPY((char *)p->payload + p->len, arg, oversize_used, last_unsent);
+ p->len += oversize_used;
+ }
+ }
+ last_unsent->len += oversize_used;
+#if TCP_OVERSIZE_DBGCHECK
+ last_unsent->oversize_left -= oversize_used;
+#endif /* TCP_OVERSIZE_DBGCHECK */
+ }
+ pcb->unsent_oversize = oversize;
+#endif /* TCP_OVERSIZE */
+
+ /*
+ * Phase 2: concat_p can be concatenated onto last_unsent->p
+ */
+ if (concat_p != NULL) {
+ LWIP_ASSERT("tcp_write: cannot concatenate when pcb->unsent is empty",
+ (last_unsent != NULL));
+ pbuf_cat(last_unsent->p, concat_p);
+ last_unsent->len += concat_p->tot_len;
+#if TCP_CHECKSUM_ON_COPY
+ if (concat_chksummed) {
+ tcp_seg_add_chksum(concat_chksum, concat_chksummed, &last_unsent->chksum,
+ &last_unsent->chksum_swapped);
+ last_unsent->flags |= TF_SEG_DATA_CHECKSUMMED;
+ }
+#endif /* TCP_CHECKSUM_ON_COPY */
+ }
+
+ /*
+ * Phase 3: Append queue to pcb->unsent. Queue may be NULL, but that
+ * is harmless
+ */
+ if (last_unsent == NULL) {
+ pcb->unsent = queue;
+ } else {
+ last_unsent->next = queue;
+ }
+
+ /*
+ * Finally update the pcb state.
+ */
+ pcb->snd_lbb += len;
+ pcb->snd_buf -= len;
+ pcb->snd_queuelen = queuelen;
+
+ LWIP_DEBUGF(TCP_QLEN_DEBUG, ("tcp_write: %"S16_F" (after enqueued)\n",
+ pcb->snd_queuelen));
+ if (pcb->snd_queuelen != 0) {
+ LWIP_ASSERT("tcp_write: valid queue length",
+ pcb->unacked != NULL || pcb->unsent != NULL);
+ }
+
+ /* Set the PSH flag in the last segment that we enqueued. */
+ if (seg != NULL && seg->tcphdr != NULL && ((apiflags & TCP_WRITE_FLAG_MORE)==0)) {
+ TCPH_SET_FLAG(seg->tcphdr, TCP_PSH);
+ }
+
+ return ERR_OK;
+memerr:
+ pcb->flags |= TF_NAGLEMEMERR;
+ TCP_STATS_INC(tcp.memerr);
+
+ if (concat_p != NULL) {
+ pbuf_free(concat_p);
+ }
+ if (queue != NULL) {
+ tcp_segs_free(queue);
+ }
+ if (pcb->snd_queuelen != 0) {
+ LWIP_ASSERT("tcp_write: valid queue length", pcb->unacked != NULL ||
+ pcb->unsent != NULL);
+ }
+ LWIP_DEBUGF(TCP_QLEN_DEBUG | LWIP_DBG_STATE, ("tcp_write: %"S16_F" (with mem err)\n", pcb->snd_queuelen));
+ return ERR_MEM;
+}
+
+/**
+ * Enqueue TCP options for transmission.
+ *
+ * Called by tcp_connect(), tcp_listen_input(), and tcp_send_ctrl().
+ *
+ * @param pcb Protocol control block for the TCP connection.
+ * @param flags TCP header flags to set in the outgoing segment.
+ * @param optdata pointer to TCP options, or NULL.
+ * @param optlen length of TCP options in bytes.
+ */
+err_t
+tcp_enqueue_flags(struct tcp_pcb *pcb, u8_t flags)
+{
+ struct pbuf *p;
+ struct tcp_seg *seg;
+ u8_t optflags = 0;
+ u8_t optlen = 0;
+
+ LWIP_DEBUGF(TCP_QLEN_DEBUG, ("tcp_enqueue_flags: queuelen: %"U16_F"\n", (u16_t)pcb->snd_queuelen));
+
+ LWIP_ASSERT("tcp_enqueue_flags: need either TCP_SYN or TCP_FIN in flags (programmer violates API)",
+ (flags & (TCP_SYN | TCP_FIN)) != 0);
+
+ /* check for configured max queuelen and possible overflow */
+ if ((pcb->snd_queuelen >= TCP_SND_QUEUELEN) || (pcb->snd_queuelen > TCP_SNDQUEUELEN_OVERFLOW)) {
+ LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 3, ("tcp_enqueue_flags: too long queue %"U16_F" (max %"U16_F")\n",
+ pcb->snd_queuelen, TCP_SND_QUEUELEN));
+ TCP_STATS_INC(tcp.memerr);
+ pcb->flags |= TF_NAGLEMEMERR;
+ return ERR_MEM;
+ }
+
+ if (flags & TCP_SYN) {
+ optflags = TF_SEG_OPTS_MSS;
+ }
+#if LWIP_TCP_TIMESTAMPS
+ if ((pcb->flags & TF_TIMESTAMP)) {
+ optflags |= TF_SEG_OPTS_TS;
+ }
+#endif /* LWIP_TCP_TIMESTAMPS */
+ optlen = LWIP_TCP_OPT_LENGTH(optflags);
+
+ /* tcp_enqueue_flags is always called with either SYN or FIN in flags.
+ * We need one available snd_buf byte to do that.
+ * This means we can't send FIN while snd_buf==0. A better fix would be to
+ * not include SYN and FIN sequence numbers in the snd_buf count. */
+ if (pcb->snd_buf == 0) {
+ LWIP_DEBUGF(TCP_OUTPUT_DEBUG | 3, ("tcp_enqueue_flags: no send buffer available\n"));
+ TCP_STATS_INC(tcp.memerr);
+ return ERR_MEM;
+ }
+
+ /* Allocate pbuf with room for TCP header + options */
+ if ((p = pbuf_alloc(PBUF_TRANSPORT, optlen, PBUF_RAM)) == NULL) {
+ pcb->flags |= TF_NAGLEMEMERR;
+ TCP_STATS_INC(tcp.memerr);
+ return ERR_MEM;
+ }
+ LWIP_ASSERT("tcp_enqueue_flags: check that first pbuf can hold optlen",
+ (p->len >= optlen));
+
+ /* Allocate memory for tcp_seg, and fill in fields. */
+ if ((seg = tcp_create_segment(pcb, p, flags, pcb->snd_lbb, optflags)) == NULL) {
+ pcb->flags |= TF_NAGLEMEMERR;
+ TCP_STATS_INC(tcp.memerr);
+ return ERR_MEM;
+ }
+ LWIP_ASSERT("seg->tcphdr not aligned", ((mem_ptr_t)seg->tcphdr % MEM_ALIGNMENT) == 0);
+ LWIP_ASSERT("tcp_enqueue_flags: invalid segment length", seg->len == 0);
+
+ LWIP_DEBUGF(TCP_OUTPUT_DEBUG | LWIP_DBG_TRACE,
+ ("tcp_enqueue_flags: queueing %"U32_F":%"U32_F" (0x%"X16_F")\n",
+ ntohl(seg->tcphdr->seqno),
+ ntohl(seg->tcphdr->seqno) + TCP_TCPLEN(seg),
+ (u16_t)flags));
+
+ /* Now append seg to pcb->unsent queue */
+ if (pcb->unsent == NULL) {
+ pcb->unsent = seg;
+ } else {
+ struct tcp_seg *useg;
+ for (useg = pcb->unsent; useg->next != NULL; useg = useg->next);
+ useg->next = seg;
+ }
+#if TCP_OVERSIZE
+ /* The new unsent tail has no space */
+ pcb->unsent_oversize = 0;
+#endif /* TCP_OVERSIZE */
+
+ /* SYN and FIN bump the sequence number */
+ if ((flags & TCP_SYN) || (flags & TCP_FIN)) {
+ pcb->snd_lbb++;
+ /* optlen does not influence snd_buf */
+ pcb->snd_buf--;
+ }
+ if (flags & TCP_FIN) {
+ pcb->flags |= TF_FIN;
+ }
+
+ /* update number of segments on the queues */
+ pcb->snd_queuelen += pbuf_clen(seg->p);
+ LWIP_DEBUGF(TCP_QLEN_DEBUG, ("tcp_enqueue_flags: %"S16_F" (after enqueued)\n", pcb->snd_queuelen));
+ if (pcb->snd_queuelen != 0) {
+ LWIP_ASSERT("tcp_enqueue_flags: invalid queue length",
+ pcb->unacked != NULL || pcb->unsent != NULL);
+ }
+
+ return ERR_OK;
+}
+
+
+#if LWIP_TCP_TIMESTAMPS
+/* Build a timestamp option (12 bytes long) at the specified options pointer)
+ *
+ * @param pcb tcp_pcb
+ * @param opts option pointer where to store the timestamp option
+ */
+static void
+tcp_build_timestamp_option(struct tcp_pcb *pcb, u32_t *opts)
+{
+ /* Pad with two NOP options to make everything nicely aligned */
+ opts[0] = PP_HTONL(0x0101080A);
+ opts[1] = htonl(sys_now());
+ opts[2] = htonl(pcb->ts_recent);
+}
+#endif
+
+/** Send an ACK without data.
+ *
+ * @param pcb Protocol control block for the TCP connection to send the ACK
+ */
+err_t
+tcp_send_empty_ack(struct tcp_pcb *pcb)
+{
+ struct pbuf *p;
+ struct tcp_hdr *tcphdr;
+ u8_t optlen = 0;
+
+#if LWIP_TCP_TIMESTAMPS
+ if (pcb->flags & TF_TIMESTAMP) {
+ optlen = LWIP_TCP_OPT_LENGTH(TF_SEG_OPTS_TS);
+ }
+#endif
+
+ p = tcp_output_alloc_header(pcb, optlen, 0, htonl(pcb->snd_nxt));
+ if (p == NULL) {
+ LWIP_DEBUGF(TCP_OUTPUT_DEBUG, ("tcp_output: (ACK) could not allocate pbuf\n"));
+ return ERR_BUF;
+ }
+ tcphdr = (struct tcp_hdr *)p->payload;
+ LWIP_DEBUGF(TCP_OUTPUT_DEBUG,
+ ("tcp_output: sending ACK for %"U32_F"\n", pcb->rcv_nxt));
+ /* remove ACK flags from the PCB, as we send an empty ACK now */
+ pcb->flags &= ~(TF_ACK_DELAY | TF_ACK_NOW);
+
+ /* NB. MSS option is only sent on SYNs, so ignore it here */
+#if LWIP_TCP_TIMESTAMPS
+ pcb->ts_lastacksent = pcb->rcv_nxt;
+
+ if (pcb->flags & TF_TIMESTAMP) {
+ tcp_build_timestamp_option(pcb, (u32_t *)(tcphdr + 1));
+ }
+#endif
+
+#if CHECKSUM_GEN_TCP
+ tcphdr->chksum = inet_chksum_pseudo(p, &(pcb->local_ip), &(pcb->remote_ip),
+ IP_PROTO_TCP, p->tot_len);
+#endif
+#if LWIP_NETIF_HWADDRHINT
+ ip_output_hinted(p, &(pcb->local_ip), &(pcb->remote_ip), pcb->ttl, pcb->tos,
+ IP_PROTO_TCP, &(pcb->addr_hint));
+#else /* LWIP_NETIF_HWADDRHINT*/
+ ip_output(p, &(pcb->local_ip), &(pcb->remote_ip), pcb->ttl, pcb->tos,
+ IP_PROTO_TCP);
+#endif /* LWIP_NETIF_HWADDRHINT*/
+ pbuf_free(p);
+
+ return ERR_OK;
+}
+
+/**
+ * Find out what we can send and send it
+ *
+ * @param pcb Protocol control block for the TCP connection to send data
+ * @return ERR_OK if data has been sent or nothing to send
+ * another err_t on error
+ */
+err_t
+tcp_output(struct tcp_pcb *pcb)
+{
+ struct tcp_seg *seg, *useg;
+ u32_t wnd, snd_nxt;
+#if TCP_CWND_DEBUG
+ s16_t i = 0;
+#endif /* TCP_CWND_DEBUG */
+
+ /* First, check if we are invoked by the TCP input processing
+ code. If so, we do not output anything. Instead, we rely on the
+ input processing code to call us when input processing is done
+ with. */
+ if (tcp_input_pcb == pcb) {
+ return ERR_OK;
+ }
+
+ wnd = LWIP_MIN(pcb->snd_wnd, pcb->cwnd);
+
+ seg = pcb->unsent;
+
+ /* If the TF_ACK_NOW flag is set and no data will be sent (either
+ * because the ->unsent queue is empty or because the window does
+ * not allow it), construct an empty ACK segment and send it.
+ *
+ * If data is to be sent, we will just piggyback the ACK (see below).
+ */
+ if (pcb->flags & TF_ACK_NOW &&
+ (seg == NULL ||
+ ntohl(seg->tcphdr->seqno) - pcb->lastack + seg->len > wnd)) {
+ return tcp_send_empty_ack(pcb);
+ }
+
+ /* useg should point to last segment on unacked queue */
+ useg = pcb->unacked;
+ if (useg != NULL) {
+ for (; useg->next != NULL; useg = useg->next);
+ }
+
+#if TCP_OUTPUT_DEBUG
+ if (seg == NULL) {
+ LWIP_DEBUGF(TCP_OUTPUT_DEBUG, ("tcp_output: nothing to send (%p)\n",
+ (void*)pcb->unsent));
+ }
+#endif /* TCP_OUTPUT_DEBUG */
+#if TCP_CWND_DEBUG
+ if (seg == NULL) {
+ LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_output: snd_wnd %"U16_F
+ ", cwnd %"U16_F", wnd %"U32_F
+ ", seg == NULL, ack %"U32_F"\n",
+ pcb->snd_wnd, pcb->cwnd, wnd, pcb->lastack));
+ } else {
+ LWIP_DEBUGF(TCP_CWND_DEBUG,
+ ("tcp_output: snd_wnd %"U16_F", cwnd %"U16_F", wnd %"U32_F
+ ", effwnd %"U32_F", seq %"U32_F", ack %"U32_F"\n",
+ pcb->snd_wnd, pcb->cwnd, wnd,
+ ntohl(seg->tcphdr->seqno) - pcb->lastack + seg->len,
+ ntohl(seg->tcphdr->seqno), pcb->lastack));
+ }
+#endif /* TCP_CWND_DEBUG */
+ /* data available and window allows it to be sent? */
+ while (seg != NULL &&
+ ntohl(seg->tcphdr->seqno) - pcb->lastack + seg->len <= wnd) {
+ LWIP_ASSERT("RST not expected here!",
+ (TCPH_FLAGS(seg->tcphdr) & TCP_RST) == 0);
+ /* Stop sending if the nagle algorithm would prevent it
+ * Don't stop:
+ * - if tcp_write had a memory error before (prevent delayed ACK timeout) or
+ * - if FIN was already enqueued for this PCB (SYN is always alone in a segment -
+ * either seg->next != NULL or pcb->unacked == NULL;
+ * RST is no sent using tcp_write/tcp_output.
+ */
+ if((tcp_do_output_nagle(pcb) == 0) &&
+ ((pcb->flags & (TF_NAGLEMEMERR | TF_FIN)) == 0)){
+ break;
+ }
+#if TCP_CWND_DEBUG
+ LWIP_DEBUGF(TCP_CWND_DEBUG, ("tcp_output: snd_wnd %"U16_F", cwnd %"U16_F", wnd %"U32_F", effwnd %"U32_F", seq %"U32_F", ack %"U32_F", i %"S16_F"\n",
+ pcb->snd_wnd, pcb->cwnd, wnd,
+ ntohl(seg->tcphdr->seqno) + seg->len -
+ pcb->lastack,
+ ntohl(seg->tcphdr->seqno), pcb->lastack, i));
+ ++i;
+#endif /* TCP_CWND_DEBUG */
+
+ pcb->unsent = seg->next;
+
+ if (pcb->state != SYN_SENT) {
+ TCPH_SET_FLAG(seg->tcphdr, TCP_ACK);
+ pcb->flags &= ~(TF_ACK_DELAY | TF_ACK_NOW);
+ }
+
+ tcp_output_segment(seg, pcb);
+ snd_nxt = ntohl(seg->tcphdr->seqno) + TCP_TCPLEN(seg);
+ if (TCP_SEQ_LT(pcb->snd_nxt, snd_nxt)) {
+ pcb->snd_nxt = snd_nxt;
+ }
+ /* put segment on unacknowledged list if length > 0 */
+ if (TCP_TCPLEN(seg) > 0) {
+ seg->next = NULL;
+ /* unacked list is empty? */
+ if (pcb->unacked == NULL) {
+ pcb->unacked = seg;
+ useg = seg;
+ /* unacked list is not empty? */
+ } else {
+ /* In the case of fast retransmit, the packet should not go to the tail
+ * of the unacked queue, but rather somewhere before it. We need to check for
+ * this case. -STJ Jul 27, 2004 */
+ if (TCP_SEQ_LT(ntohl(seg->tcphdr->seqno), ntohl(useg->tcphdr->seqno))) {
+ /* add segment to before tail of unacked list, keeping the list sorted */
+ struct tcp_seg **cur_seg = &(pcb->unacked);
+ while (*cur_seg &&
+ TCP_SEQ_LT(ntohl((*cur_seg)->tcphdr->seqno), ntohl(seg->tcphdr->seqno))) {
+ cur_seg = &((*cur_seg)->next );
+ }
+ seg->next = (*cur_seg);
+ (*cur_seg) = seg;
+ } else {
+ /* add segment to tail of unacked list */
+ useg->next = seg;
+ useg = useg->next;
+ }
+ }
+ /* do not queue empty segments on the unacked list */
+ } else {
+ tcp_seg_free(seg);
+ }
+ seg = pcb->unsent;
+ }
+#if TCP_OVERSIZE
+ if (pcb->unsent == NULL) {
+ /* last unsent has been removed, reset unsent_oversize */
+ pcb->unsent_oversize = 0;
+ }
+#endif /* TCP_OVERSIZE */
+
+ if (seg != NULL && pcb->persist_backoff == 0 &&
+ ntohl(seg->tcphdr->seqno) - pcb->lastack + seg->len > pcb->snd_wnd) {
+ /* prepare for persist timer */
+ pcb->persist_cnt = 0;
+ pcb->persist_backoff = 1;
+ }
+
+ pcb->flags &= ~TF_NAGLEMEMERR;
+ return ERR_OK;
+}
+
+/**
+ * Called by tcp_output() to actually send a TCP segment over IP.
+ *
+ * @param seg the tcp_seg to send
+ * @param pcb the tcp_pcb for the TCP connection used to send the segment
+ */
+static void
+tcp_output_segment(struct tcp_seg *seg, struct tcp_pcb *pcb)
+{
+ u16_t len;
+ struct netif *netif;
+ u32_t *opts;
+
+ /** @bug Exclude retransmitted segments from this count. */
+ snmp_inc_tcpoutsegs();
+
+ /* The TCP header has already been constructed, but the ackno and
+ wnd fields remain. */
+ seg->tcphdr->ackno = htonl(pcb->rcv_nxt);
+
+ /* advertise our receive window size in this TCP segment */
+ seg->tcphdr->wnd = htons(pcb->rcv_ann_wnd);
+
+ pcb->rcv_ann_right_edge = pcb->rcv_nxt + pcb->rcv_ann_wnd;
+
+ /* Add any requested options. NB MSS option is only set on SYN
+ packets, so ignore it here */
+ LWIP_ASSERT("seg->tcphdr not aligned", ((mem_ptr_t)seg->tcphdr % MEM_ALIGNMENT) == 0);
+ opts = (u32_t *)(void *)(seg->tcphdr + 1);
+ if (seg->flags & TF_SEG_OPTS_MSS) {
+ TCP_BUILD_MSS_OPTION(*opts);
+ opts += 1;
+ }
+#if LWIP_TCP_TIMESTAMPS
+ pcb->ts_lastacksent = pcb->rcv_nxt;
+
+ if (seg->flags & TF_SEG_OPTS_TS) {
+ tcp_build_timestamp_option(pcb, opts);
+ opts += 3;
+ }
+#endif
+
+ /* Set retransmission timer running if it is not currently enabled
+ This must be set before checking the route. */
+ if (pcb->rtime == -1) {
+ pcb->rtime = 0;
+ }
+
+ /* If we don't have a local IP address, we get one by
+ calling ip_route(). */
+ if (ip_addr_isany(&(pcb->local_ip))) {
+ netif = ip_route(&(pcb->remote_ip));
+ if (netif == NULL) {
+ return;
+ }
+ ip_addr_copy(pcb->local_ip, netif->ip_addr);
+ }
+
+ if (pcb->rttest == 0) {
+ pcb->rttest = tcp_ticks;
+ pcb->rtseq = ntohl(seg->tcphdr->seqno);
+
+ LWIP_DEBUGF(TCP_RTO_DEBUG, ("tcp_output_segment: rtseq %"U32_F"\n", pcb->rtseq));
+ }
+ LWIP_DEBUGF(TCP_OUTPUT_DEBUG, ("tcp_output_segment: %"U32_F":%"U32_F"\n",
+ htonl(seg->tcphdr->seqno), htonl(seg->tcphdr->seqno) +
+ seg->len));
+
+ len = (u16_t)((u8_t *)seg->tcphdr - (u8_t *)seg->p->payload);
+
+ seg->p->len -= len;
+ seg->p->tot_len -= len;
+
+ seg->p->payload = seg->tcphdr;
+
+ seg->tcphdr->chksum = 0;
+#if CHECKSUM_GEN_TCP
+#if TCP_CHECKSUM_ON_COPY
+ {
+ u32_t acc;
+#if TCP_CHECKSUM_ON_COPY_SANITY_CHECK
+ u16_t chksum_slow = inet_chksum_pseudo(seg->p, &(pcb->local_ip),
+ &(pcb->remote_ip),
+ IP_PROTO_TCP, seg->p->tot_len);
+#endif /* TCP_CHECKSUM_ON_COPY_SANITY_CHECK */
+ if ((seg->flags & TF_SEG_DATA_CHECKSUMMED) == 0) {
+ LWIP_ASSERT("data included but not checksummed",
+ seg->p->tot_len == (TCPH_HDRLEN(seg->tcphdr) * 4));
+ }
+
+ /* rebuild TCP header checksum (TCP header changes for retransmissions!) */
+ acc = inet_chksum_pseudo_partial(seg->p, &(pcb->local_ip),
+ &(pcb->remote_ip),
+ IP_PROTO_TCP, seg->p->tot_len, TCPH_HDRLEN(seg->tcphdr) * 4);
+ /* add payload checksum */
+ if (seg->chksum_swapped) {
+ seg->chksum = SWAP_BYTES_IN_WORD(seg->chksum);
+ seg->chksum_swapped = 0;
+ }
+ acc += (u16_t)~(seg->chksum);
+ seg->tcphdr->chksum = FOLD_U32T(acc);
+#if TCP_CHECKSUM_ON_COPY_SANITY_CHECK
+ if (chksum_slow != seg->tcphdr->chksum) {
+ LWIP_DEBUGF(TCP_DEBUG | LWIP_DBG_LEVEL_WARNING,
+ ("tcp_output_segment: calculated checksum is %"X16_F" instead of %"X16_F"\n",
+ seg->tcphdr->chksum, chksum_slow));
+ seg->tcphdr->chksum = chksum_slow;
+ }
+#endif /* TCP_CHECKSUM_ON_COPY_SANITY_CHECK */
+ }
+#else /* TCP_CHECKSUM_ON_COPY */
+ seg->tcphdr->chksum = inet_chksum_pseudo(seg->p, &(pcb->local_ip),
+ &(pcb->remote_ip),
+ IP_PROTO_TCP, seg->p->tot_len);
+#endif /* TCP_CHECKSUM_ON_COPY */
+#endif /* CHECKSUM_GEN_TCP */
+ TCP_STATS_INC(tcp.xmit);
+
+#if LWIP_NETIF_HWADDRHINT
+ ip_output_hinted(seg->p, &(pcb->local_ip), &(pcb->remote_ip), pcb->ttl, pcb->tos,
+ IP_PROTO_TCP, &(pcb->addr_hint));
+#else /* LWIP_NETIF_HWADDRHINT*/
+ ip_output(seg->p, &(pcb->local_ip), &(pcb->remote_ip), pcb->ttl, pcb->tos,
+ IP_PROTO_TCP);
+#endif /* LWIP_NETIF_HWADDRHINT*/
+}
+
+/**
+ * Send a TCP RESET packet (empty segment with RST flag set) either to
+ * abort a connection or to show that there is no matching local connection
+ * for a received segment.
+ *
+ * Called by tcp_abort() (to abort a local connection), tcp_input() (if no
+ * matching local pcb was found), tcp_listen_input() (if incoming segment
+ * has ACK flag set) and tcp_process() (received segment in the wrong state)
+ *
+ * Since a RST segment is in most cases not sent for an active connection,
+ * tcp_rst() has a number of arguments that are taken from a tcp_pcb for
+ * most other segment output functions.
+ *
+ * @param seqno the sequence number to use for the outgoing segment
+ * @param ackno the acknowledge number to use for the outgoing segment
+ * @param local_ip the local IP address to send the segment from
+ * @param remote_ip the remote IP address to send the segment to
+ * @param local_port the local TCP port to send the segment from
+ * @param remote_port the remote TCP port to send the segment to
+ */
+void
+tcp_rst(u32_t seqno, u32_t ackno,
+ ip_addr_t *local_ip, ip_addr_t *remote_ip,
+ u16_t local_port, u16_t remote_port)
+{
+ struct pbuf *p;
+ struct tcp_hdr *tcphdr;
+ p = pbuf_alloc(PBUF_IP, TCP_HLEN, PBUF_RAM);
+ if (p == NULL) {
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_rst: could not allocate memory for pbuf\n"));
+ return;
+ }
+ LWIP_ASSERT("check that first pbuf can hold struct tcp_hdr",
+ (p->len >= sizeof(struct tcp_hdr)));
+
+ tcphdr = (struct tcp_hdr *)p->payload;
+ tcphdr->src = htons(local_port);
+ tcphdr->dest = htons(remote_port);
+ tcphdr->seqno = htonl(seqno);
+ tcphdr->ackno = htonl(ackno);
+ TCPH_HDRLEN_FLAGS_SET(tcphdr, TCP_HLEN/4, TCP_RST | TCP_ACK);
+ tcphdr->wnd = PP_HTONS(TCP_WND);
+ tcphdr->chksum = 0;
+ tcphdr->urgp = 0;
+
+#if CHECKSUM_GEN_TCP
+ tcphdr->chksum = inet_chksum_pseudo(p, local_ip, remote_ip,
+ IP_PROTO_TCP, p->tot_len);
+#endif
+ TCP_STATS_INC(tcp.xmit);
+ snmp_inc_tcpoutrsts();
+ /* Send output with hardcoded TTL since we have no access to the pcb */
+ ip_output(p, local_ip, remote_ip, TCP_TTL, 0, IP_PROTO_TCP);
+ pbuf_free(p);
+ LWIP_DEBUGF(TCP_RST_DEBUG, ("tcp_rst: seqno %"U32_F" ackno %"U32_F".\n", seqno, ackno));
+}
+
+/**
+ * Requeue all unacked segments for retransmission
+ *
+ * Called by tcp_slowtmr() for slow retransmission.
+ *
+ * @param pcb the tcp_pcb for which to re-enqueue all unacked segments
+ */
+void
+tcp_rexmit_rto(struct tcp_pcb *pcb)
+{
+ struct tcp_seg *seg;
+
+ if (pcb->unacked == NULL) {
+ return;
+ }
+
+ /* Move all unacked segments to the head of the unsent queue */
+ for (seg = pcb->unacked; seg->next != NULL; seg = seg->next);
+ /* concatenate unsent queue after unacked queue */
+ seg->next = pcb->unsent;
+ /* unsent queue is the concatenated queue (of unacked, unsent) */
+ pcb->unsent = pcb->unacked;
+ /* unacked queue is now empty */
+ pcb->unacked = NULL;
+
+ /* increment number of retransmissions */
+ ++pcb->nrtx;
+
+ /* Don't take any RTT measurements after retransmitting. */
+ pcb->rttest = 0;
+
+ /* Do the actual retransmission */
+ tcp_output(pcb);
+}
+
+/**
+ * Requeue the first unacked segment for retransmission
+ *
+ * Called by tcp_receive() for fast retramsmit.
+ *
+ * @param pcb the tcp_pcb for which to retransmit the first unacked segment
+ */
+void
+tcp_rexmit(struct tcp_pcb *pcb)
+{
+ struct tcp_seg *seg;
+ struct tcp_seg **cur_seg;
+
+ if (pcb->unacked == NULL) {
+ return;
+ }
+
+ /* Move the first unacked segment to the unsent queue */
+ /* Keep the unsent queue sorted. */
+ seg = pcb->unacked;
+ pcb->unacked = seg->next;
+
+ cur_seg = &(pcb->unsent);
+ while (*cur_seg &&
+ TCP_SEQ_LT(ntohl((*cur_seg)->tcphdr->seqno), ntohl(seg->tcphdr->seqno))) {
+ cur_seg = &((*cur_seg)->next );
+ }
+ seg->next = *cur_seg;
+ *cur_seg = seg;
+
+ ++pcb->nrtx;
+
+ /* Don't take any rtt measurements after retransmitting. */
+ pcb->rttest = 0;
+
+ /* Do the actual retransmission. */
+ snmp_inc_tcpretranssegs();
+ /* No need to call tcp_output: we are always called from tcp_input()
+ and thus tcp_output directly returns. */
+}
+
+
+/**
+ * Handle retransmission after three dupacks received
+ *
+ * @param pcb the tcp_pcb for which to retransmit the first unacked segment
+ */
+void
+tcp_rexmit_fast(struct tcp_pcb *pcb)
+{
+ if (pcb->unacked != NULL && !(pcb->flags & TF_INFR)) {
+ /* This is fast retransmit. Retransmit the first unacked segment. */
+ LWIP_DEBUGF(TCP_FR_DEBUG,
+ ("tcp_receive: dupacks %"U16_F" (%"U32_F
+ "), fast retransmit %"U32_F"\n",
+ (u16_t)pcb->dupacks, pcb->lastack,
+ ntohl(pcb->unacked->tcphdr->seqno)));
+ tcp_rexmit(pcb);
+
+ /* Set ssthresh to half of the minimum of the current
+ * cwnd and the advertised window */
+ if (pcb->cwnd > pcb->snd_wnd) {
+ pcb->ssthresh = pcb->snd_wnd / 2;
+ } else {
+ pcb->ssthresh = pcb->cwnd / 2;
+ }
+
+ /* The minimum value for ssthresh should be 2 MSS */
+ if (pcb->ssthresh < 2*pcb->mss) {
+ LWIP_DEBUGF(TCP_FR_DEBUG,
+ ("tcp_receive: The minimum value for ssthresh %"U16_F
+ " should be min 2 mss %"U16_F"...\n",
+ pcb->ssthresh, 2*pcb->mss));
+ pcb->ssthresh = 2*pcb->mss;
+ }
+
+ pcb->cwnd = pcb->ssthresh + 3 * pcb->mss;
+ pcb->flags |= TF_INFR;
+ }
+}
+
+
+/**
+ * Send keepalive packets to keep a connection active although
+ * no data is sent over it.
+ *
+ * Called by tcp_slowtmr()
+ *
+ * @param pcb the tcp_pcb for which to send a keepalive packet
+ */
+void
+tcp_keepalive(struct tcp_pcb *pcb)
+{
+ struct pbuf *p;
+ struct tcp_hdr *tcphdr;
+
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_keepalive: sending KEEPALIVE probe to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
+ ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
+
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_keepalive: tcp_ticks %"U32_F" pcb->tmr %"U32_F" pcb->keep_cnt_sent %"U16_F"\n",
+ tcp_ticks, pcb->tmr, pcb->keep_cnt_sent));
+
+ p = tcp_output_alloc_header(pcb, 0, 0, htonl(pcb->snd_nxt - 1));
+ if(p == NULL) {
+ LWIP_DEBUGF(TCP_DEBUG,
+ ("tcp_keepalive: could not allocate memory for pbuf\n"));
+ return;
+ }
+ tcphdr = (struct tcp_hdr *)p->payload;
+
+#if CHECKSUM_GEN_TCP
+ tcphdr->chksum = inet_chksum_pseudo(p, &pcb->local_ip, &pcb->remote_ip,
+ IP_PROTO_TCP, p->tot_len);
+#endif
+ TCP_STATS_INC(tcp.xmit);
+
+ /* Send output to IP */
+#if LWIP_NETIF_HWADDRHINT
+ ip_output_hinted(p, &pcb->local_ip, &pcb->remote_ip, pcb->ttl, 0, IP_PROTO_TCP,
+ &(pcb->addr_hint));
+#else /* LWIP_NETIF_HWADDRHINT*/
+ ip_output(p, &pcb->local_ip, &pcb->remote_ip, pcb->ttl, 0, IP_PROTO_TCP);
+#endif /* LWIP_NETIF_HWADDRHINT*/
+
+ pbuf_free(p);
+
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_keepalive: seqno %"U32_F" ackno %"U32_F".\n",
+ pcb->snd_nxt - 1, pcb->rcv_nxt));
+}
+
+
+/**
+ * Send persist timer zero-window probes to keep a connection active
+ * when a window update is lost.
+ *
+ * Called by tcp_slowtmr()
+ *
+ * @param pcb the tcp_pcb for which to send a zero-window probe packet
+ */
+void
+tcp_zero_window_probe(struct tcp_pcb *pcb)
+{
+ struct pbuf *p;
+ struct tcp_hdr *tcphdr;
+ struct tcp_seg *seg;
+ u16_t len;
+ u8_t is_fin;
+
+ LWIP_DEBUGF(TCP_DEBUG,
+ ("tcp_zero_window_probe: sending ZERO WINDOW probe to %"
+ U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
+ ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip)));
+
+ LWIP_DEBUGF(TCP_DEBUG,
+ ("tcp_zero_window_probe: tcp_ticks %"U32_F
+ " pcb->tmr %"U32_F" pcb->keep_cnt_sent %"U16_F"\n",
+ tcp_ticks, pcb->tmr, pcb->keep_cnt_sent));
+
+ seg = pcb->unacked;
+
+ if(seg == NULL) {
+ seg = pcb->unsent;
+ }
+ if(seg == NULL) {
+ return;
+ }
+
+ is_fin = ((TCPH_FLAGS(seg->tcphdr) & TCP_FIN) != 0) && (seg->len == 0);
+ /* we want to send one seqno: either FIN or data (no options) */
+ len = is_fin ? 0 : 1;
+
+ p = tcp_output_alloc_header(pcb, 0, len, seg->tcphdr->seqno);
+ if(p == NULL) {
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_zero_window_probe: no memory for pbuf\n"));
+ return;
+ }
+ tcphdr = (struct tcp_hdr *)p->payload;
+
+ if (is_fin) {
+ /* FIN segment, no data */
+ TCPH_FLAGS_SET(tcphdr, TCP_ACK | TCP_FIN);
+ } else {
+ /* Data segment, copy in one byte from the head of the unacked queue */
+ struct tcp_hdr *thdr = (struct tcp_hdr *)seg->p->payload;
+ char *d = ((char *)p->payload + TCP_HLEN);
+ pbuf_copy_partial(seg->p, d, 1, TCPH_HDRLEN(thdr) * 4);
+ }
+
+#if CHECKSUM_GEN_TCP
+ tcphdr->chksum = inet_chksum_pseudo(p, &pcb->local_ip, &pcb->remote_ip,
+ IP_PROTO_TCP, p->tot_len);
+#endif
+ TCP_STATS_INC(tcp.xmit);
+
+ /* Send output to IP */
+#if LWIP_NETIF_HWADDRHINT
+ ip_output_hinted(p, &pcb->local_ip, &pcb->remote_ip, pcb->ttl, 0, IP_PROTO_TCP,
+ &(pcb->addr_hint));
+#else /* LWIP_NETIF_HWADDRHINT*/
+ ip_output(p, &pcb->local_ip, &pcb->remote_ip, pcb->ttl, 0, IP_PROTO_TCP);
+#endif /* LWIP_NETIF_HWADDRHINT*/
+
+ pbuf_free(p);
+
+ LWIP_DEBUGF(TCP_DEBUG, ("tcp_zero_window_probe: seqno %"U32_F
+ " ackno %"U32_F".\n",
+ pcb->snd_nxt - 1, pcb->rcv_nxt));
+}
+#endif /* LWIP_TCP */
--- /dev/null
+/**
+ * @file
+ * User Datagram Protocol module
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+
+/* udp.c
+ *
+ * The code for the User Datagram Protocol UDP & UDPLite (RFC 3828).
+ *
+ */
+
+/* @todo Check the use of '(struct udp_pcb).chksum_len_rx'!
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/udp.h"
+#include "lwip/def.h"
+#include "lwip/memp.h"
+#include "lwip/inet_chksum.h"
+#include "lwip/ip_addr.h"
+#include "lwip/netif.h"
+#include "lwip/icmp.h"
+#include "lwip/stats.h"
+#include "lwip/snmp.h"
+#include "arch/perf.h"
+#include "lwip/dhcp.h"
+
+#include <string.h>
+
+/* The list of UDP PCBs */
+/* exported in udp.h (was static) */
+struct udp_pcb *udp_pcbs;
+
+/**
+ * Process an incoming UDP datagram.
+ *
+ * Given an incoming UDP datagram (as a chain of pbufs) this function
+ * finds a corresponding UDP PCB and hands over the pbuf to the pcbs
+ * recv function. If no pcb is found or the datagram is incorrect, the
+ * pbuf is freed.
+ *
+ * @param p pbuf to be demultiplexed to a UDP PCB.
+ * @param inp network interface on which the datagram was received.
+ *
+ */
+void
+udp_input(struct pbuf *p, struct netif *inp)
+{
+ struct udp_hdr *udphdr;
+ struct udp_pcb *pcb, *prev;
+ struct udp_pcb *uncon_pcb;
+ struct ip_hdr *iphdr;
+ u16_t src, dest;
+ u8_t local_match;
+ u8_t broadcast;
+
+ PERF_START;
+
+ UDP_STATS_INC(udp.recv);
+
+ iphdr = (struct ip_hdr *)p->payload;
+
+ /* Check minimum length (IP header + UDP header)
+ * and move payload pointer to UDP header */
+ if (p->tot_len < (IPH_HL(iphdr) * 4 + UDP_HLEN) || pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4))) {
+ /* drop short packets */
+ LWIP_DEBUGF(UDP_DEBUG,
+ ("udp_input: short UDP datagram (%"U16_F" bytes) discarded\n", p->tot_len));
+ UDP_STATS_INC(udp.lenerr);
+ UDP_STATS_INC(udp.drop);
+ snmp_inc_udpinerrors();
+ pbuf_free(p);
+ goto end;
+ }
+
+ udphdr = (struct udp_hdr *)p->payload;
+
+ /* is broadcast packet ? */
+ broadcast = ip_addr_isbroadcast(¤t_iphdr_dest, inp);
+
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_input: received datagram of length %"U16_F"\n", p->tot_len));
+
+ /* convert src and dest ports to host byte order */
+ src = ntohs(udphdr->src);
+ dest = ntohs(udphdr->dest);
+
+ udp_debug_print(udphdr);
+
+ /* print the UDP source and destination */
+ LWIP_DEBUGF(UDP_DEBUG,
+ ("udp (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") <-- "
+ "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
+ ip4_addr1_16(&iphdr->dest), ip4_addr2_16(&iphdr->dest),
+ ip4_addr3_16(&iphdr->dest), ip4_addr4_16(&iphdr->dest), ntohs(udphdr->dest),
+ ip4_addr1_16(&iphdr->src), ip4_addr2_16(&iphdr->src),
+ ip4_addr3_16(&iphdr->src), ip4_addr4_16(&iphdr->src), ntohs(udphdr->src)));
+
+#if LWIP_DHCP
+ pcb = NULL;
+ /* when LWIP_DHCP is active, packets to DHCP_CLIENT_PORT may only be processed by
+ the dhcp module, no other UDP pcb may use the local UDP port DHCP_CLIENT_PORT */
+ if (dest == DHCP_CLIENT_PORT) {
+ /* all packets for DHCP_CLIENT_PORT not coming from DHCP_SERVER_PORT are dropped! */
+ if (src == DHCP_SERVER_PORT) {
+ if ((inp->dhcp != NULL) && (inp->dhcp->pcb != NULL)) {
+ /* accept the packe if
+ (- broadcast or directed to us) -> DHCP is link-layer-addressed, local ip is always ANY!
+ - inp->dhcp->pcb->remote == ANY or iphdr->src */
+ if ((ip_addr_isany(&inp->dhcp->pcb->remote_ip) ||
+ ip_addr_cmp(&(inp->dhcp->pcb->remote_ip), ¤t_iphdr_src))) {
+ pcb = inp->dhcp->pcb;
+ }
+ }
+ }
+ } else
+#endif /* LWIP_DHCP */
+ {
+ prev = NULL;
+ local_match = 0;
+ uncon_pcb = NULL;
+ /* Iterate through the UDP pcb list for a matching pcb.
+ * 'Perfect match' pcbs (connected to the remote port & ip address) are
+ * preferred. If no perfect match is found, the first unconnected pcb that
+ * matches the local port and ip address gets the datagram. */
+ for (pcb = udp_pcbs; pcb != NULL; pcb = pcb->next) {
+ local_match = 0;
+ /* print the PCB local and remote address */
+ LWIP_DEBUGF(UDP_DEBUG,
+ ("pcb (%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F") --- "
+ "(%"U16_F".%"U16_F".%"U16_F".%"U16_F", %"U16_F")\n",
+ ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
+ ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip), pcb->local_port,
+ ip4_addr1_16(&pcb->remote_ip), ip4_addr2_16(&pcb->remote_ip),
+ ip4_addr3_16(&pcb->remote_ip), ip4_addr4_16(&pcb->remote_ip), pcb->remote_port));
+
+ /* compare PCB local addr+port to UDP destination addr+port */
+ if ((pcb->local_port == dest) &&
+ ((!broadcast && ip_addr_isany(&pcb->local_ip)) ||
+ ip_addr_cmp(&(pcb->local_ip), ¤t_iphdr_dest) ||
+#if LWIP_IGMP
+ ip_addr_ismulticast(¤t_iphdr_dest) ||
+#endif /* LWIP_IGMP */
+#if IP_SOF_BROADCAST_RECV
+ (broadcast && (pcb->so_options & SOF_BROADCAST)))) {
+#else /* IP_SOF_BROADCAST_RECV */
+ (broadcast))) {
+#endif /* IP_SOF_BROADCAST_RECV */
+ local_match = 1;
+ if ((uncon_pcb == NULL) &&
+ ((pcb->flags & UDP_FLAGS_CONNECTED) == 0)) {
+ /* the first unconnected matching PCB */
+ uncon_pcb = pcb;
+ }
+ }
+ /* compare PCB remote addr+port to UDP source addr+port */
+ if ((local_match != 0) &&
+ (pcb->remote_port == src) &&
+ (ip_addr_isany(&pcb->remote_ip) ||
+ ip_addr_cmp(&(pcb->remote_ip), ¤t_iphdr_src))) {
+ /* the first fully matching PCB */
+ if (prev != NULL) {
+ /* move the pcb to the front of udp_pcbs so that is
+ found faster next time */
+ prev->next = pcb->next;
+ pcb->next = udp_pcbs;
+ udp_pcbs = pcb;
+ } else {
+ UDP_STATS_INC(udp.cachehit);
+ }
+ break;
+ }
+ prev = pcb;
+ }
+ /* no fully matching pcb found? then look for an unconnected pcb */
+ if (pcb == NULL) {
+ pcb = uncon_pcb;
+ }
+ }
+
+ /* Check checksum if this is a match or if it was directed at us. */
+ if (pcb != NULL || ip_addr_cmp(&inp->ip_addr, ¤t_iphdr_dest)) {
+ LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: calculating checksum\n"));
+#if LWIP_UDPLITE
+ if (IPH_PROTO(iphdr) == IP_PROTO_UDPLITE) {
+ /* Do the UDP Lite checksum */
+#if CHECKSUM_CHECK_UDP
+ u16_t chklen = ntohs(udphdr->len);
+ if (chklen < sizeof(struct udp_hdr)) {
+ if (chklen == 0) {
+ /* For UDP-Lite, checksum length of 0 means checksum
+ over the complete packet (See RFC 3828 chap. 3.1) */
+ chklen = p->tot_len;
+ } else {
+ /* At least the UDP-Lite header must be covered by the
+ checksum! (Again, see RFC 3828 chap. 3.1) */
+ UDP_STATS_INC(udp.chkerr);
+ UDP_STATS_INC(udp.drop);
+ snmp_inc_udpinerrors();
+ pbuf_free(p);
+ goto end;
+ }
+ }
+ if (inet_chksum_pseudo_partial(p, ¤t_iphdr_src, ¤t_iphdr_dest,
+ IP_PROTO_UDPLITE, p->tot_len, chklen) != 0) {
+ LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
+ ("udp_input: UDP Lite datagram discarded due to failing checksum\n"));
+ UDP_STATS_INC(udp.chkerr);
+ UDP_STATS_INC(udp.drop);
+ snmp_inc_udpinerrors();
+ pbuf_free(p);
+ goto end;
+ }
+#endif /* CHECKSUM_CHECK_UDP */
+ } else
+#endif /* LWIP_UDPLITE */
+ {
+#if CHECKSUM_CHECK_UDP
+ if (udphdr->chksum != 0) {
+ if (inet_chksum_pseudo(p, ip_current_src_addr(), ip_current_dest_addr(),
+ IP_PROTO_UDP, p->tot_len) != 0) {
+ LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
+ ("udp_input: UDP datagram discarded due to failing checksum\n"));
+ UDP_STATS_INC(udp.chkerr);
+ UDP_STATS_INC(udp.drop);
+ snmp_inc_udpinerrors();
+ pbuf_free(p);
+ goto end;
+ }
+ }
+#endif /* CHECKSUM_CHECK_UDP */
+ }
+ if(pbuf_header(p, -UDP_HLEN)) {
+ /* Can we cope with this failing? Just assert for now */
+ LWIP_ASSERT("pbuf_header failed\n", 0);
+ UDP_STATS_INC(udp.drop);
+ snmp_inc_udpinerrors();
+ pbuf_free(p);
+ goto end;
+ }
+ if (pcb != NULL) {
+ snmp_inc_udpindatagrams();
+#if SO_REUSE && SO_REUSE_RXTOALL
+ if ((broadcast || ip_addr_ismulticast(¤t_iphdr_dest)) &&
+ ((pcb->so_options & SOF_REUSEADDR) != 0)) {
+ /* pass broadcast- or multicast packets to all multicast pcbs
+ if SOF_REUSEADDR is set on the first match */
+ struct udp_pcb *mpcb;
+ u8_t p_header_changed = 0;
+ for (mpcb = udp_pcbs; mpcb != NULL; mpcb = mpcb->next) {
+ if (mpcb != pcb) {
+ /* compare PCB local addr+port to UDP destination addr+port */
+ if ((mpcb->local_port == dest) &&
+ ((!broadcast && ip_addr_isany(&mpcb->local_ip)) ||
+ ip_addr_cmp(&(mpcb->local_ip), ¤t_iphdr_dest) ||
+#if LWIP_IGMP
+ ip_addr_ismulticast(¤t_iphdr_dest) ||
+#endif /* LWIP_IGMP */
+#if IP_SOF_BROADCAST_RECV
+ (broadcast && (mpcb->so_options & SOF_BROADCAST)))) {
+#else /* IP_SOF_BROADCAST_RECV */
+ (broadcast))) {
+#endif /* IP_SOF_BROADCAST_RECV */
+ /* pass a copy of the packet to all local matches */
+ if (mpcb->recv != NULL) {
+ struct pbuf *q;
+ /* for that, move payload to IP header again */
+ if (p_header_changed == 0) {
+ pbuf_header(p, (s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
+ p_header_changed = 1;
+ }
+ q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
+ if (q != NULL) {
+ err_t err = pbuf_copy(q, p);
+ if (err == ERR_OK) {
+ /* move payload to UDP data */
+ pbuf_header(q, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
+ mpcb->recv(mpcb->recv_arg, mpcb, q, ip_current_src_addr(), src);
+ }
+ }
+ }
+ }
+ }
+ }
+ if (p_header_changed) {
+ /* and move payload to UDP data again */
+ pbuf_header(p, -(s16_t)((IPH_HL(iphdr) * 4) + UDP_HLEN));
+ }
+ }
+#endif /* SO_REUSE && SO_REUSE_RXTOALL */
+ /* callback */
+ if (pcb->recv != NULL) {
+ /* now the recv function is responsible for freeing p */
+ pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr(), src);
+ } else {
+ /* no recv function registered? then we have to free the pbuf! */
+ pbuf_free(p);
+ goto end;
+ }
+ } else {
+ LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_input: not for us.\n"));
+
+#if LWIP_ICMP
+ /* No match was found, send ICMP destination port unreachable unless
+ destination address was broadcast/multicast. */
+ if (!broadcast &&
+ !ip_addr_ismulticast(¤t_iphdr_dest)) {
+ /* move payload pointer back to ip header */
+ pbuf_header(p, (IPH_HL(iphdr) * 4) + UDP_HLEN);
+ LWIP_ASSERT("p->payload == iphdr", (p->payload == iphdr));
+ icmp_dest_unreach(p, ICMP_DUR_PORT);
+ }
+#endif /* LWIP_ICMP */
+ UDP_STATS_INC(udp.proterr);
+ UDP_STATS_INC(udp.drop);
+ snmp_inc_udpnoports();
+ pbuf_free(p);
+ }
+ } else {
+ pbuf_free(p);
+ }
+end:
+ PERF_STOP("udp_input");
+}
+
+/**
+ * Send data using UDP.
+ *
+ * @param pcb UDP PCB used to send the data.
+ * @param p chain of pbuf's to be sent.
+ *
+ * The datagram will be sent to the current remote_ip & remote_port
+ * stored in pcb. If the pcb is not bound to a port, it will
+ * automatically be bound to a random port.
+ *
+ * @return lwIP error code.
+ * - ERR_OK. Successful. No error occured.
+ * - ERR_MEM. Out of memory.
+ * - ERR_RTE. Could not find route to destination address.
+ * - More errors could be returned by lower protocol layers.
+ *
+ * @see udp_disconnect() udp_sendto()
+ */
+err_t
+udp_send(struct udp_pcb *pcb, struct pbuf *p)
+{
+ /* send to the packet using remote ip and port stored in the pcb */
+ return udp_sendto(pcb, p, &pcb->remote_ip, pcb->remote_port);
+}
+
+#if LWIP_CHECKSUM_ON_COPY
+/** Same as udp_send() but with checksum
+ */
+err_t
+udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
+ u8_t have_chksum, u16_t chksum)
+{
+ /* send to the packet using remote ip and port stored in the pcb */
+ return udp_sendto_chksum(pcb, p, &pcb->remote_ip, pcb->remote_port,
+ have_chksum, chksum);
+}
+#endif /* LWIP_CHECKSUM_ON_COPY */
+
+/**
+ * Send data to a specified address using UDP.
+ *
+ * @param pcb UDP PCB used to send the data.
+ * @param p chain of pbuf's to be sent.
+ * @param dst_ip Destination IP address.
+ * @param dst_port Destination UDP port.
+ *
+ * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
+ *
+ * If the PCB already has a remote address association, it will
+ * be restored after the data is sent.
+ *
+ * @return lwIP error code (@see udp_send for possible error codes)
+ *
+ * @see udp_disconnect() udp_send()
+ */
+err_t
+udp_sendto(struct udp_pcb *pcb, struct pbuf *p,
+ ip_addr_t *dst_ip, u16_t dst_port)
+{
+#if LWIP_CHECKSUM_ON_COPY
+ return udp_sendto_chksum(pcb, p, dst_ip, dst_port, 0, 0);
+}
+
+/** Same as udp_sendto(), but with checksum */
+err_t
+udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
+ u16_t dst_port, u8_t have_chksum, u16_t chksum)
+{
+#endif /* LWIP_CHECKSUM_ON_COPY */
+ struct netif *netif;
+
+ LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send\n"));
+
+ /* find the outgoing network interface for this packet */
+#if LWIP_IGMP
+ netif = ip_route((ip_addr_ismulticast(dst_ip))?(&(pcb->multicast_ip)):(dst_ip));
+#else
+ netif = ip_route(dst_ip);
+#endif /* LWIP_IGMP */
+
+ /* no outgoing network interface could be found? */
+ if (netif == NULL) {
+ LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ ip4_addr1_16(dst_ip), ip4_addr2_16(dst_ip), ip4_addr3_16(dst_ip), ip4_addr4_16(dst_ip)));
+ UDP_STATS_INC(udp.rterr);
+ return ERR_RTE;
+ }
+#if LWIP_CHECKSUM_ON_COPY
+ return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, have_chksum, chksum);
+#else /* LWIP_CHECKSUM_ON_COPY */
+ return udp_sendto_if(pcb, p, dst_ip, dst_port, netif);
+#endif /* LWIP_CHECKSUM_ON_COPY */
+}
+
+/**
+ * Send data to a specified address using UDP.
+ * The netif used for sending can be specified.
+ *
+ * This function exists mainly for DHCP, to be able to send UDP packets
+ * on a netif that is still down.
+ *
+ * @param pcb UDP PCB used to send the data.
+ * @param p chain of pbuf's to be sent.
+ * @param dst_ip Destination IP address.
+ * @param dst_port Destination UDP port.
+ * @param netif the netif used for sending.
+ *
+ * dst_ip & dst_port are expected to be in the same byte order as in the pcb.
+ *
+ * @return lwIP error code (@see udp_send for possible error codes)
+ *
+ * @see udp_disconnect() udp_send()
+ */
+err_t
+udp_sendto_if(struct udp_pcb *pcb, struct pbuf *p,
+ ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif)
+{
+#if LWIP_CHECKSUM_ON_COPY
+ return udp_sendto_if_chksum(pcb, p, dst_ip, dst_port, netif, 0, 0);
+}
+
+/** Same as udp_sendto_if(), but with checksum */
+err_t
+udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p, ip_addr_t *dst_ip,
+ u16_t dst_port, struct netif *netif, u8_t have_chksum,
+ u16_t chksum)
+{
+#endif /* LWIP_CHECKSUM_ON_COPY */
+ struct udp_hdr *udphdr;
+ ip_addr_t *src_ip;
+ err_t err;
+ struct pbuf *q; /* q will be sent down the stack */
+
+#if IP_SOF_BROADCAST
+ /* broadcast filter? */
+ if ( ((pcb->so_options & SOF_BROADCAST) == 0) && ip_addr_isbroadcast(dst_ip, netif) ) {
+ LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
+ ("udp_sendto_if: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
+ return ERR_VAL;
+ }
+#endif /* IP_SOF_BROADCAST */
+
+ /* if the PCB is not yet bound to a port, bind it here */
+ if (pcb->local_port == 0) {
+ LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_send: not yet bound to a port, binding now\n"));
+ err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
+ if (err != ERR_OK) {
+ LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: forced port bind failed\n"));
+ return err;
+ }
+ }
+
+ /* not enough space to add an UDP header to first pbuf in given p chain? */
+ if (pbuf_header(p, UDP_HLEN)) {
+ /* allocate header in a separate new pbuf */
+ q = pbuf_alloc(PBUF_IP, UDP_HLEN, PBUF_RAM);
+ /* new header pbuf could not be allocated? */
+ if (q == NULL) {
+ LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("udp_send: could not allocate header\n"));
+ return ERR_MEM;
+ }
+ if (p->tot_len != 0) {
+ /* chain header q in front of given pbuf p (only if p contains data) */
+ pbuf_chain(q, p);
+ }
+ /* first pbuf q points to header pbuf */
+ LWIP_DEBUGF(UDP_DEBUG,
+ ("udp_send: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
+ } else {
+ /* adding space for header within p succeeded */
+ /* first pbuf q equals given pbuf */
+ q = p;
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_send: added header in given pbuf %p\n", (void *)p));
+ }
+ LWIP_ASSERT("check that first pbuf can hold struct udp_hdr",
+ (q->len >= sizeof(struct udp_hdr)));
+ /* q now represents the packet to be sent */
+ udphdr = (struct udp_hdr *)q->payload;
+ udphdr->src = htons(pcb->local_port);
+ udphdr->dest = htons(dst_port);
+ /* in UDP, 0 checksum means 'no checksum' */
+ udphdr->chksum = 0x0000;
+
+ /* Multicast Loop? */
+#if LWIP_IGMP
+ if (ip_addr_ismulticast(dst_ip) && ((pcb->flags & UDP_FLAGS_MULTICAST_LOOP) != 0)) {
+ q->flags |= PBUF_FLAG_MCASTLOOP;
+ }
+#endif /* LWIP_IGMP */
+
+
+ /* PCB local address is IP_ANY_ADDR? */
+ if (ip_addr_isany(&pcb->local_ip)) {
+ /* use outgoing network interface IP address as source address */
+ src_ip = &(netif->ip_addr);
+ } else {
+ /* check if UDP PCB local IP address is correct
+ * this could be an old address if netif->ip_addr has changed */
+ if (!ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
+ /* local_ip doesn't match, drop the packet */
+ if (q != p) {
+ /* free the header pbuf */
+ pbuf_free(q);
+ q = NULL;
+ /* p is still referenced by the caller, and will live on */
+ }
+ return ERR_VAL;
+ }
+ /* use UDP PCB local IP address as source address */
+ src_ip = &(pcb->local_ip);
+ }
+
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_send: sending datagram of length %"U16_F"\n", q->tot_len));
+
+#if LWIP_UDPLITE
+ /* UDP Lite protocol? */
+ if (pcb->flags & UDP_FLAGS_UDPLITE) {
+ u16_t chklen, chklen_hdr;
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE packet length %"U16_F"\n", q->tot_len));
+ /* set UDP message length in UDP header */
+ chklen_hdr = chklen = pcb->chksum_len_tx;
+ if ((chklen < sizeof(struct udp_hdr)) || (chklen > q->tot_len)) {
+ if (chklen != 0) {
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP LITE pcb->chksum_len is illegal: %"U16_F"\n", chklen));
+ }
+ /* For UDP-Lite, checksum length of 0 means checksum
+ over the complete packet. (See RFC 3828 chap. 3.1)
+ At least the UDP-Lite header must be covered by the
+ checksum, therefore, if chksum_len has an illegal
+ value, we generate the checksum over the complete
+ packet to be safe. */
+ chklen_hdr = 0;
+ chklen = q->tot_len;
+ }
+ udphdr->len = htons(chklen_hdr);
+ /* calculate checksum */
+#if CHECKSUM_GEN_UDP
+ udphdr->chksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip,
+ IP_PROTO_UDPLITE, q->tot_len,
+#if !LWIP_CHECKSUM_ON_COPY
+ chklen);
+#else /* !LWIP_CHECKSUM_ON_COPY */
+ (have_chksum ? UDP_HLEN : chklen));
+ if (have_chksum) {
+ u32_t acc;
+ acc = udphdr->chksum + (u16_t)~(chksum);
+ udphdr->chksum = FOLD_U32T(acc);
+ }
+#endif /* !LWIP_CHECKSUM_ON_COPY */
+
+ /* chksum zero must become 0xffff, as zero means 'no checksum' */
+ if (udphdr->chksum == 0x0000) {
+ udphdr->chksum = 0xffff;
+ }
+#endif /* CHECKSUM_GEN_UDP */
+ /* output to IP */
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDPLITE,)\n"));
+#if LWIP_NETIF_HWADDRHINT
+ netif->addr_hint = &(pcb->addr_hint);
+#endif /* LWIP_NETIF_HWADDRHINT*/
+ err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDPLITE, netif);
+#if LWIP_NETIF_HWADDRHINT
+ netif->addr_hint = NULL;
+#endif /* LWIP_NETIF_HWADDRHINT*/
+ } else
+#endif /* LWIP_UDPLITE */
+ { /* UDP */
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP packet length %"U16_F"\n", q->tot_len));
+ udphdr->len = htons(q->tot_len);
+ /* calculate checksum */
+#if CHECKSUM_GEN_UDP
+ if ((pcb->flags & UDP_FLAGS_NOCHKSUM) == 0) {
+ u16_t udpchksum;
+#if LWIP_CHECKSUM_ON_COPY
+ if (have_chksum) {
+ u32_t acc;
+ udpchksum = inet_chksum_pseudo_partial(q, src_ip, dst_ip, IP_PROTO_UDP,
+ q->tot_len, UDP_HLEN);
+ acc = udpchksum + (u16_t)~(chksum);
+ udpchksum = FOLD_U32T(acc);
+ } else
+#endif /* LWIP_CHECKSUM_ON_COPY */
+ {
+ udpchksum = inet_chksum_pseudo(q, src_ip, dst_ip, IP_PROTO_UDP, q->tot_len);
+ }
+
+ /* chksum zero must become 0xffff, as zero means 'no checksum' */
+ if (udpchksum == 0x0000) {
+ udpchksum = 0xffff;
+ }
+ udphdr->chksum = udpchksum;
+ }
+#endif /* CHECKSUM_GEN_UDP */
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_send: UDP checksum 0x%04"X16_F"\n", udphdr->chksum));
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_send: ip_output_if (,,,,IP_PROTO_UDP,)\n"));
+ /* output to IP */
+#if LWIP_NETIF_HWADDRHINT
+ netif->addr_hint = &(pcb->addr_hint);
+#endif /* LWIP_NETIF_HWADDRHINT*/
+ err = ip_output_if(q, src_ip, dst_ip, pcb->ttl, pcb->tos, IP_PROTO_UDP, netif);
+#if LWIP_NETIF_HWADDRHINT
+ netif->addr_hint = NULL;
+#endif /* LWIP_NETIF_HWADDRHINT*/
+ }
+ /* TODO: must this be increased even if error occured? */
+ snmp_inc_udpoutdatagrams();
+
+ /* did we chain a separate header pbuf earlier? */
+ if (q != p) {
+ /* free the header pbuf */
+ pbuf_free(q);
+ q = NULL;
+ /* p is still referenced by the caller, and will live on */
+ }
+
+ UDP_STATS_INC(udp.xmit);
+ return err;
+}
+
+/**
+ * Bind an UDP PCB.
+ *
+ * @param pcb UDP PCB to be bound with a local address ipaddr and port.
+ * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
+ * bind to all local interfaces.
+ * @param port local UDP port to bind with. Use 0 to automatically bind
+ * to a random port between UDP_LOCAL_PORT_RANGE_START and
+ * UDP_LOCAL_PORT_RANGE_END.
+ *
+ * ipaddr & port are expected to be in the same byte order as in the pcb.
+ *
+ * @return lwIP error code.
+ * - ERR_OK. Successful. No error occured.
+ * - ERR_USE. The specified ipaddr and port are already bound to by
+ * another UDP PCB.
+ *
+ * @see udp_disconnect()
+ */
+err_t
+udp_bind(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
+{
+ struct udp_pcb *ipcb;
+ u8_t rebind;
+
+ LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, ("udp_bind(ipaddr = "));
+ ip_addr_debug_print(UDP_DEBUG, ipaddr);
+ LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE, (", port = %"U16_F")\n", port));
+
+ rebind = 0;
+ /* Check for double bind and rebind of the same pcb */
+ for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
+ /* is this UDP PCB already on active list? */
+ if (pcb == ipcb) {
+ /* pcb may occur at most once in active list */
+ LWIP_ASSERT("rebind == 0", rebind == 0);
+ /* pcb already in list, just rebind */
+ rebind = 1;
+ }
+
+ /* By default, we don't allow to bind to a port that any other udp
+ PCB is alread bound to, unless *all* PCBs with that port have tha
+ REUSEADDR flag set. */
+#if SO_REUSE
+ else if (((pcb->so_options & SOF_REUSEADDR) == 0) &&
+ ((ipcb->so_options & SOF_REUSEADDR) == 0)) {
+#else /* SO_REUSE */
+ /* port matches that of PCB in list and REUSEADDR not set -> reject */
+ else {
+#endif /* SO_REUSE */
+ if ((ipcb->local_port == port) &&
+ /* IP address matches, or one is IP_ADDR_ANY? */
+ (ip_addr_isany(&(ipcb->local_ip)) ||
+ ip_addr_isany(ipaddr) ||
+ ip_addr_cmp(&(ipcb->local_ip), ipaddr))) {
+ /* other PCB already binds to this local IP and port */
+ LWIP_DEBUGF(UDP_DEBUG,
+ ("udp_bind: local port %"U16_F" already bound by another pcb\n", port));
+ return ERR_USE;
+ }
+ }
+ }
+
+ ip_addr_set(&pcb->local_ip, ipaddr);
+
+ /* no port specified? */
+ if (port == 0) {
+#ifndef UDP_LOCAL_PORT_RANGE_START
+/* From http://www.iana.org/assignments/port-numbers:
+ "The Dynamic and/or Private Ports are those from 49152 through 65535" */
+#define UDP_LOCAL_PORT_RANGE_START 0xc000
+#define UDP_LOCAL_PORT_RANGE_END 0xffff
+#endif
+ port = UDP_LOCAL_PORT_RANGE_START;
+ ipcb = udp_pcbs;
+ while ((ipcb != NULL) && (port != UDP_LOCAL_PORT_RANGE_END)) {
+ if (ipcb->local_port == port) {
+ /* port is already used by another udp_pcb */
+ port++;
+ /* restart scanning all udp pcbs */
+ ipcb = udp_pcbs;
+ } else {
+ /* go on with next udp pcb */
+ ipcb = ipcb->next;
+ }
+ }
+ if (ipcb != NULL) {
+ /* no more ports available in local range */
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_bind: out of free UDP ports\n"));
+ return ERR_USE;
+ }
+ }
+ pcb->local_port = port;
+ snmp_insert_udpidx_tree(pcb);
+ /* pcb not active yet? */
+ if (rebind == 0) {
+ /* place the PCB on the active list if not already there */
+ pcb->next = udp_pcbs;
+ udp_pcbs = pcb;
+ }
+ LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+ ("udp_bind: bound to %"U16_F".%"U16_F".%"U16_F".%"U16_F", port %"U16_F"\n",
+ ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
+ ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
+ pcb->local_port));
+ return ERR_OK;
+}
+/**
+ * Connect an UDP PCB.
+ *
+ * This will associate the UDP PCB with the remote address.
+ *
+ * @param pcb UDP PCB to be connected with remote address ipaddr and port.
+ * @param ipaddr remote IP address to connect with.
+ * @param port remote UDP port to connect with.
+ *
+ * @return lwIP error code
+ *
+ * ipaddr & port are expected to be in the same byte order as in the pcb.
+ *
+ * The udp pcb is bound to a random local port if not already bound.
+ *
+ * @see udp_disconnect()
+ */
+err_t
+udp_connect(struct udp_pcb *pcb, ip_addr_t *ipaddr, u16_t port)
+{
+ struct udp_pcb *ipcb;
+
+ if (pcb->local_port == 0) {
+ err_t err = udp_bind(pcb, &pcb->local_ip, pcb->local_port);
+ if (err != ERR_OK) {
+ return err;
+ }
+ }
+
+ ip_addr_set(&pcb->remote_ip, ipaddr);
+ pcb->remote_port = port;
+ pcb->flags |= UDP_FLAGS_CONNECTED;
+/** TODO: this functionality belongs in upper layers */
+#ifdef LWIP_UDP_TODO
+ /* Nail down local IP for netconn_addr()/getsockname() */
+ if (ip_addr_isany(&pcb->local_ip) && !ip_addr_isany(&pcb->remote_ip)) {
+ struct netif *netif;
+
+ if ((netif = ip_route(&(pcb->remote_ip))) == NULL) {
+ LWIP_DEBUGF(UDP_DEBUG, ("udp_connect: No route to 0x%lx\n", pcb->remote_ip.addr));
+ UDP_STATS_INC(udp.rterr);
+ return ERR_RTE;
+ }
+ /** TODO: this will bind the udp pcb locally, to the interface which
+ is used to route output packets to the remote address. However, we
+ might want to accept incoming packets on any interface! */
+ pcb->local_ip = netif->ip_addr;
+ } else if (ip_addr_isany(&pcb->remote_ip)) {
+ pcb->local_ip.addr = 0;
+ }
+#endif
+ LWIP_DEBUGF(UDP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+ ("udp_connect: connected to %"U16_F".%"U16_F".%"U16_F".%"U16_F",port %"U16_F"\n",
+ ip4_addr1_16(&pcb->local_ip), ip4_addr2_16(&pcb->local_ip),
+ ip4_addr3_16(&pcb->local_ip), ip4_addr4_16(&pcb->local_ip),
+ pcb->local_port));
+
+ /* Insert UDP PCB into the list of active UDP PCBs. */
+ for (ipcb = udp_pcbs; ipcb != NULL; ipcb = ipcb->next) {
+ if (pcb == ipcb) {
+ /* already on the list, just return */
+ return ERR_OK;
+ }
+ }
+ /* PCB not yet on the list, add PCB now */
+ pcb->next = udp_pcbs;
+ udp_pcbs = pcb;
+ return ERR_OK;
+}
+
+/**
+ * Disconnect a UDP PCB
+ *
+ * @param pcb the udp pcb to disconnect.
+ */
+void
+udp_disconnect(struct udp_pcb *pcb)
+{
+ /* reset remote address association */
+ ip_addr_set_any(&pcb->remote_ip);
+ pcb->remote_port = 0;
+ /* mark PCB as unconnected */
+ pcb->flags &= ~UDP_FLAGS_CONNECTED;
+}
+
+/**
+ * Set a receive callback for a UDP PCB
+ *
+ * This callback will be called when receiving a datagram for the pcb.
+ *
+ * @param pcb the pcb for wich to set the recv callback
+ * @param recv function pointer of the callback function
+ * @param recv_arg additional argument to pass to the callback function
+ */
+void
+udp_recv(struct udp_pcb *pcb, udp_recv_fn recv, void *recv_arg)
+{
+ /* remember recv() callback and user data */
+ pcb->recv = recv;
+ pcb->recv_arg = recv_arg;
+}
+
+/**
+ * Remove an UDP PCB.
+ *
+ * @param pcb UDP PCB to be removed. The PCB is removed from the list of
+ * UDP PCB's and the data structure is freed from memory.
+ *
+ * @see udp_new()
+ */
+void
+udp_remove(struct udp_pcb *pcb)
+{
+ struct udp_pcb *pcb2;
+
+ snmp_delete_udpidx_tree(pcb);
+ /* pcb to be removed is first in list? */
+ if (udp_pcbs == pcb) {
+ /* make list start at 2nd pcb */
+ udp_pcbs = udp_pcbs->next;
+ /* pcb not 1st in list */
+ } else {
+ for (pcb2 = udp_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
+ /* find pcb in udp_pcbs list */
+ if (pcb2->next != NULL && pcb2->next == pcb) {
+ /* remove pcb from list */
+ pcb2->next = pcb->next;
+ }
+ }
+ }
+ memp_free(MEMP_UDP_PCB, pcb);
+}
+
+/**
+ * Create a UDP PCB.
+ *
+ * @return The UDP PCB which was created. NULL if the PCB data structure
+ * could not be allocated.
+ *
+ * @see udp_remove()
+ */
+struct udp_pcb *
+udp_new(void)
+{
+ struct udp_pcb *pcb;
+ pcb = (struct udp_pcb *)memp_malloc(MEMP_UDP_PCB);
+ /* could allocate UDP PCB? */
+ if (pcb != NULL) {
+ /* UDP Lite: by initializing to all zeroes, chksum_len is set to 0
+ * which means checksum is generated over the whole datagram per default
+ * (recommended as default by RFC 3828). */
+ /* initialize PCB to all zeroes */
+ memset(pcb, 0, sizeof(struct udp_pcb));
+ pcb->ttl = UDP_TTL;
+ }
+ return pcb;
+}
+
+#if UDP_DEBUG
+/**
+ * Print UDP header information for debug purposes.
+ *
+ * @param udphdr pointer to the udp header in memory.
+ */
+void
+udp_debug_print(struct udp_hdr *udphdr)
+{
+ LWIP_DEBUGF(UDP_DEBUG, ("UDP header:\n"));
+ LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
+ LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | %5"U16_F" | (src port, dest port)\n",
+ ntohs(udphdr->src), ntohs(udphdr->dest)));
+ LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
+ LWIP_DEBUGF(UDP_DEBUG, ("| %5"U16_F" | 0x%04"X16_F" | (len, chksum)\n",
+ ntohs(udphdr->len), ntohs(udphdr->chksum)));
+ LWIP_DEBUGF(UDP_DEBUG, ("+-------------------------------+\n"));
+}
+#endif /* UDP_DEBUG */
+
+#endif /* LWIP_UDP */
--- /dev/null
+/**
+ * @file
+ *
+ * AutoIP Automatic LinkLocal IP Configuration
+ */
+
+/*
+ *
+ * Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * Author: Dominik Spies <kontakt@dspies.de>
+ *
+ * This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
+ * with RFC 3927.
+ *
+ *
+ * Please coordinate changes and requests with Dominik Spies
+ * <kontakt@dspies.de>
+ */
+
+#ifndef __LWIP_AUTOIP_H__
+#define __LWIP_AUTOIP_H__
+
+#include "lwip/opt.h"
+
+#if LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/netif.h"
+#include "lwip/udp.h"
+#include "netif/etharp.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* AutoIP Timing */
+#define AUTOIP_TMR_INTERVAL 100
+#define AUTOIP_TICKS_PER_SECOND (1000 / AUTOIP_TMR_INTERVAL)
+
+/* RFC 3927 Constants */
+#define PROBE_WAIT 1 /* second (initial random delay) */
+#define PROBE_MIN 1 /* second (minimum delay till repeated probe) */
+#define PROBE_MAX 2 /* seconds (maximum delay till repeated probe) */
+#define PROBE_NUM 3 /* (number of probe packets) */
+#define ANNOUNCE_NUM 2 /* (number of announcement packets) */
+#define ANNOUNCE_INTERVAL 2 /* seconds (time between announcement packets) */
+#define ANNOUNCE_WAIT 2 /* seconds (delay before announcing) */
+#define MAX_CONFLICTS 10 /* (max conflicts before rate limiting) */
+#define RATE_LIMIT_INTERVAL 60 /* seconds (delay between successive attempts) */
+#define DEFEND_INTERVAL 10 /* seconds (min. wait between defensive ARPs) */
+
+/* AutoIP client states */
+#define AUTOIP_STATE_OFF 0
+#define AUTOIP_STATE_PROBING 1
+#define AUTOIP_STATE_ANNOUNCING 2
+#define AUTOIP_STATE_BOUND 3
+
+struct autoip
+{
+ ip_addr_t llipaddr; /* the currently selected, probed, announced or used LL IP-Address */
+ u8_t state; /* current AutoIP state machine state */
+ u8_t sent_num; /* sent number of probes or announces, dependent on state */
+ u16_t ttw; /* ticks to wait, tick is AUTOIP_TMR_INTERVAL long */
+ u8_t lastconflict; /* ticks until a conflict can be solved by defending */
+ u8_t tried_llipaddr; /* total number of probed/used Link Local IP-Addresses */
+};
+
+
+/** Init srand, has to be called before entering mainloop */
+void autoip_init(void);
+
+/** Set a struct autoip allocated by the application to work with */
+void autoip_set_struct(struct netif *netif, struct autoip *autoip);
+
+/** Start AutoIP client */
+err_t autoip_start(struct netif *netif);
+
+/** Stop AutoIP client */
+err_t autoip_stop(struct netif *netif);
+
+/** Handles every incoming ARP Packet, called by etharp_arp_input */
+void autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr);
+
+/** Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds */
+void autoip_tmr(void);
+
+/** Handle a possible change in the network configuration */
+void autoip_network_changed(struct netif *netif);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_AUTOIP */
+
+#endif /* __LWIP_AUTOIP_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_ICMP_H__
+#define __LWIP_ICMP_H__
+
+#include "lwip/opt.h"
+#include "lwip/pbuf.h"
+#include "lwip/ip_addr.h"
+#include "lwip/netif.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define ICMP_ER 0 /* echo reply */
+#define ICMP_DUR 3 /* destination unreachable */
+#define ICMP_SQ 4 /* source quench */
+#define ICMP_RD 5 /* redirect */
+#define ICMP_ECHO 8 /* echo */
+#define ICMP_TE 11 /* time exceeded */
+#define ICMP_PP 12 /* parameter problem */
+#define ICMP_TS 13 /* timestamp */
+#define ICMP_TSR 14 /* timestamp reply */
+#define ICMP_IRQ 15 /* information request */
+#define ICMP_IR 16 /* information reply */
+
+enum icmp_dur_type {
+ ICMP_DUR_NET = 0, /* net unreachable */
+ ICMP_DUR_HOST = 1, /* host unreachable */
+ ICMP_DUR_PROTO = 2, /* protocol unreachable */
+ ICMP_DUR_PORT = 3, /* port unreachable */
+ ICMP_DUR_FRAG = 4, /* fragmentation needed and DF set */
+ ICMP_DUR_SR = 5 /* source route failed */
+};
+
+enum icmp_te_type {
+ ICMP_TE_TTL = 0, /* time to live exceeded in transit */
+ ICMP_TE_FRAG = 1 /* fragment reassembly time exceeded */
+};
+
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+/** This is the standard ICMP header only that the u32_t data
+ * is splitted to two u16_t like ICMP echo needs it.
+ * This header is also used for other ICMP types that do not
+ * use the data part.
+ */
+PACK_STRUCT_BEGIN
+struct icmp_echo_hdr {
+ PACK_STRUCT_FIELD(u8_t type);
+ PACK_STRUCT_FIELD(u8_t code);
+ PACK_STRUCT_FIELD(u16_t chksum);
+ PACK_STRUCT_FIELD(u16_t id);
+ PACK_STRUCT_FIELD(u16_t seqno);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+
+#define ICMPH_TYPE(hdr) ((hdr)->type)
+#define ICMPH_CODE(hdr) ((hdr)->code)
+
+/** Combines type and code to an u16_t */
+#define ICMPH_TYPE_SET(hdr, t) ((hdr)->type = (t))
+#define ICMPH_CODE_SET(hdr, c) ((hdr)->code = (c))
+
+
+#if LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
+
+void icmp_input(struct pbuf *p, struct netif *inp);
+void icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t);
+void icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t);
+
+#endif /* LWIP_ICMP */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LWIP_ICMP_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2002 CITEL Technologies Ltd.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is a contribution to the lwIP TCP/IP stack.
+ * The Swedish Institute of Computer Science and Adam Dunkels
+ * are specifically granted permission to redistribute this
+ * source code.
+*/
+
+#ifndef __LWIP_IGMP_H__
+#define __LWIP_IGMP_H__
+
+#include "lwip/opt.h"
+#include "lwip/ip_addr.h"
+#include "lwip/netif.h"
+#include "lwip/pbuf.h"
+
+#if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* IGMP timer */
+#define IGMP_TMR_INTERVAL 100 /* Milliseconds */
+#define IGMP_V1_DELAYING_MEMBER_TMR (1000/IGMP_TMR_INTERVAL)
+#define IGMP_JOIN_DELAYING_MEMBER_TMR (500 /IGMP_TMR_INTERVAL)
+
+/* MAC Filter Actions, these are passed to a netif's
+ * igmp_mac_filter callback function. */
+#define IGMP_DEL_MAC_FILTER 0
+#define IGMP_ADD_MAC_FILTER 1
+
+
+/**
+ * igmp group structure - there is
+ * a list of groups for each interface
+ * these should really be linked from the interface, but
+ * if we keep them separate we will not affect the lwip original code
+ * too much
+ *
+ * There will be a group for the all systems group address but this
+ * will not run the state machine as it is used to kick off reports
+ * from all the other groups
+ */
+struct igmp_group {
+ /** next link */
+ struct igmp_group *next;
+ /** interface on which the group is active */
+ struct netif *netif;
+ /** multicast address */
+ ip_addr_t group_address;
+ /** signifies we were the last person to report */
+ u8_t last_reporter_flag;
+ /** current state of the group */
+ u8_t group_state;
+ /** timer for reporting, negative is OFF */
+ u16_t timer;
+ /** counter of simultaneous uses */
+ u8_t use;
+};
+
+/* Prototypes */
+void igmp_init(void);
+err_t igmp_start(struct netif *netif);
+err_t igmp_stop(struct netif *netif);
+void igmp_report_groups(struct netif *netif);
+struct igmp_group *igmp_lookfor_group(struct netif *ifp, ip_addr_t *addr);
+void igmp_input(struct pbuf *p, struct netif *inp, ip_addr_t *dest);
+err_t igmp_joingroup(ip_addr_t *ifaddr, ip_addr_t *groupaddr);
+err_t igmp_leavegroup(ip_addr_t *ifaddr, ip_addr_t *groupaddr);
+void igmp_tmr(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_IGMP */
+
+#endif /* __LWIP_IGMP_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_INET_H__
+#define __LWIP_INET_H__
+
+#include "lwip/opt.h"
+#include "lwip/def.h"
+#include "lwip/ip_addr.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** For compatibility with BSD code */
+struct in_addr {
+ u32_t s_addr;
+};
+
+/** 255.255.255.255 */
+#define INADDR_NONE IPADDR_NONE
+/** 127.0.0.1 */
+#define INADDR_LOOPBACK IPADDR_LOOPBACK
+/** 0.0.0.0 */
+#define INADDR_ANY IPADDR_ANY
+/** 255.255.255.255 */
+#define INADDR_BROADCAST IPADDR_BROADCAST
+
+/* Definitions of the bits in an Internet address integer.
+
+ On subnets, host and network parts are found according to
+ the subnet mask, not these masks. */
+#define IN_CLASSA(a) IP_CLASSA(a)
+#define IN_CLASSA_NET IP_CLASSA_NET
+#define IN_CLASSA_NSHIFT IP_CLASSA_NSHIFT
+#define IN_CLASSA_HOST IP_CLASSA_HOST
+#define IN_CLASSA_MAX IP_CLASSA_MAX
+
+#define IN_CLASSB(b) IP_CLASSB(b)
+#define IN_CLASSB_NET IP_CLASSB_NET
+#define IN_CLASSB_NSHIFT IP_CLASSB_NSHIFT
+#define IN_CLASSB_HOST IP_CLASSB_HOST
+#define IN_CLASSB_MAX IP_CLASSB_MAX
+
+#define IN_CLASSC(c) IP_CLASSC(c)
+#define IN_CLASSC_NET IP_CLASSC_NET
+#define IN_CLASSC_NSHIFT IP_CLASSC_NSHIFT
+#define IN_CLASSC_HOST IP_CLASSC_HOST
+#define IN_CLASSC_MAX IP_CLASSC_MAX
+
+#define IN_CLASSD(d) IP_CLASSD(d)
+#define IN_CLASSD_NET IP_CLASSD_NET /* These ones aren't really */
+#define IN_CLASSD_NSHIFT IP_CLASSD_NSHIFT /* net and host fields, but */
+#define IN_CLASSD_HOST IP_CLASSD_HOST /* routing needn't know. */
+#define IN_CLASSD_MAX IP_CLASSD_MAX
+
+#define IN_MULTICAST(a) IP_MULTICAST(a)
+
+#define IN_EXPERIMENTAL(a) IP_EXPERIMENTAL(a)
+#define IN_BADCLASS(a) IP_BADCLASS(a)
+
+#define IN_LOOPBACKNET IP_LOOPBACKNET
+
+#define inet_addr_from_ipaddr(target_inaddr, source_ipaddr) ((target_inaddr)->s_addr = ip4_addr_get_u32(source_ipaddr))
+#define inet_addr_to_ipaddr(target_ipaddr, source_inaddr) (ip4_addr_set_u32(target_ipaddr, (source_inaddr)->s_addr))
+/* ATTENTION: the next define only works because both s_addr and ip_addr_t are an u32_t effectively! */
+#define inet_addr_to_ipaddr_p(target_ipaddr_p, source_inaddr) ((target_ipaddr_p) = (ip_addr_t*)&((source_inaddr)->s_addr))
+
+/* directly map this to the lwip internal functions */
+#define inet_addr(cp) ipaddr_addr(cp)
+#define inet_aton(cp, addr) ipaddr_aton(cp, (ip_addr_t*)addr)
+#define inet_ntoa(addr) ipaddr_ntoa((ip_addr_t*)&(addr))
+#define inet_ntoa_r(addr, buf, buflen) ipaddr_ntoa_r((ip_addr_t*)&(addr), buf, buflen)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LWIP_INET_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_INET_CHKSUM_H__
+#define __LWIP_INET_CHKSUM_H__
+
+#include "lwip/opt.h"
+
+#include "lwip/pbuf.h"
+#include "lwip/ip_addr.h"
+
+/** Swap the bytes in an u16_t: much like htons() for little-endian */
+#ifndef SWAP_BYTES_IN_WORD
+#if LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN)
+/* little endian and PLATFORM_BYTESWAP defined */
+#define SWAP_BYTES_IN_WORD(w) LWIP_PLATFORM_HTONS(w)
+#else /* LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN) */
+/* can't use htons on big endian (or PLATFORM_BYTESWAP not defined)... */
+#define SWAP_BYTES_IN_WORD(w) (((w) & 0xff) << 8) | (((w) & 0xff00) >> 8)
+#endif /* LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN)*/
+#endif /* SWAP_BYTES_IN_WORD */
+
+/** Split an u32_t in two u16_ts and add them up */
+#ifndef FOLD_U32T
+#define FOLD_U32T(u) (((u) >> 16) + ((u) & 0x0000ffffUL))
+#endif
+
+#if LWIP_CHECKSUM_ON_COPY
+/** Function-like macro: same as MEMCPY but returns the checksum of copied data
+ as u16_t */
+#ifndef LWIP_CHKSUM_COPY
+#define LWIP_CHKSUM_COPY(dst, src, len) lwip_chksum_copy(dst, src, len)
+#ifndef LWIP_CHKSUM_COPY_ALGORITHM
+#define LWIP_CHKSUM_COPY_ALGORITHM 1
+#endif /* LWIP_CHKSUM_COPY_ALGORITHM */
+#endif /* LWIP_CHKSUM_COPY */
+#else /* LWIP_CHECKSUM_ON_COPY */
+#define LWIP_CHKSUM_COPY_ALGORITHM 0
+#endif /* LWIP_CHECKSUM_ON_COPY */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+u16_t inet_chksum(void *dataptr, u16_t len);
+u16_t inet_chksum_pbuf(struct pbuf *p);
+u16_t inet_chksum_pseudo(struct pbuf *p,
+ ip_addr_t *src, ip_addr_t *dest,
+ u8_t proto, u16_t proto_len);
+u16_t inet_chksum_pseudo_partial(struct pbuf *p,
+ ip_addr_t *src, ip_addr_t *dest,
+ u8_t proto, u16_t proto_len, u16_t chksum_len);
+#if LWIP_CHKSUM_COPY_ALGORITHM
+u16_t lwip_chksum_copy(void *dst, const void *src, u16_t len);
+#endif /* LWIP_CHKSUM_COPY_ALGORITHM */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LWIP_INET_H__ */
+
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_IP_H__
+#define __LWIP_IP_H__
+
+#include "lwip/opt.h"
+
+#include "lwip/def.h"
+#include "lwip/pbuf.h"
+#include "lwip/ip_addr.h"
+#include "lwip/err.h"
+#include "lwip/netif.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Currently, the function ip_output_if_opt() is only used with IGMP */
+#define IP_OPTIONS_SEND LWIP_IGMP
+
+#define IP_HLEN 20
+
+#define IP_PROTO_ICMP 1
+#define IP_PROTO_IGMP 2
+#define IP_PROTO_UDP 17
+#define IP_PROTO_UDPLITE 136
+#define IP_PROTO_TCP 6
+
+/* This is passed as the destination address to ip_output_if (not
+ to ip_output), meaning that an IP header already is constructed
+ in the pbuf. This is used when TCP retransmits. */
+#ifdef IP_HDRINCL
+#undef IP_HDRINCL
+#endif /* IP_HDRINCL */
+#define IP_HDRINCL NULL
+
+#if LWIP_NETIF_HWADDRHINT
+#define IP_PCB_ADDRHINT ;u8_t addr_hint
+#else
+#define IP_PCB_ADDRHINT
+#endif /* LWIP_NETIF_HWADDRHINT */
+
+/* This is the common part of all PCB types. It needs to be at the
+ beginning of a PCB type definition. It is located here so that
+ changes to this common part are made in one location instead of
+ having to change all PCB structs. */
+#define IP_PCB \
+ /* ip addresses in network byte order */ \
+ ip_addr_t local_ip; \
+ ip_addr_t remote_ip; \
+ /* Socket options */ \
+ u8_t so_options; \
+ /* Type Of Service */ \
+ u8_t tos; \
+ /* Time To Live */ \
+ u8_t ttl \
+ /* link layer address resolution hint */ \
+ IP_PCB_ADDRHINT
+
+struct ip_pcb {
+/* Common members of all PCB types */
+ IP_PCB;
+};
+
+/*
+ * Option flags per-socket. These are the same like SO_XXX.
+ */
+/*#define SOF_DEBUG (u8_t)0x01U Unimplemented: turn on debugging info recording */
+#define SOF_ACCEPTCONN (u8_t)0x02U /* socket has had listen() */
+#define SOF_REUSEADDR (u8_t)0x04U /* allow local address reuse */
+#define SOF_KEEPALIVE (u8_t)0x08U /* keep connections alive */
+/*#define SOF_DONTROUTE (u8_t)0x10U Unimplemented: just use interface addresses */
+#define SOF_BROADCAST (u8_t)0x20U /* permit to send and to receive broadcast messages (see IP_SOF_BROADCAST option) */
+/*#define SOF_USELOOPBACK (u8_t)0x40U Unimplemented: bypass hardware when possible */
+#define SOF_LINGER (u8_t)0x80U /* linger on close if data present */
+/*#define SOF_OOBINLINE (u16_t)0x0100U Unimplemented: leave received OOB data in line */
+/*#define SOF_REUSEPORT (u16_t)0x0200U Unimplemented: allow local address & port reuse */
+
+/* These flags are inherited (e.g. from a listen-pcb to a connection-pcb): */
+#define SOF_INHERITED (SOF_REUSEADDR|SOF_KEEPALIVE|SOF_LINGER/*|SOF_DEBUG|SOF_DONTROUTE|SOF_OOBINLINE*/)
+
+
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+struct ip_hdr {
+ /* version / header length / type of service */
+ PACK_STRUCT_FIELD(u16_t _v_hl_tos);
+ /* total length */
+ PACK_STRUCT_FIELD(u16_t _len);
+ /* identification */
+ PACK_STRUCT_FIELD(u16_t _id);
+ /* fragment offset field */
+ PACK_STRUCT_FIELD(u16_t _offset);
+#define IP_RF 0x8000U /* reserved fragment flag */
+#define IP_DF 0x4000U /* dont fragment flag */
+#define IP_MF 0x2000U /* more fragments flag */
+#define IP_OFFMASK 0x1fffU /* mask for fragmenting bits */
+ /* time to live */
+ PACK_STRUCT_FIELD(u8_t _ttl);
+ /* protocol*/
+ PACK_STRUCT_FIELD(u8_t _proto);
+ /* checksum */
+ PACK_STRUCT_FIELD(u16_t _chksum);
+ /* source and destination IP addresses */
+ PACK_STRUCT_FIELD(ip_addr_p_t src);
+ PACK_STRUCT_FIELD(ip_addr_p_t dest);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+
+#define IPH_V(hdr) (ntohs((hdr)->_v_hl_tos) >> 12)
+#define IPH_HL(hdr) ((ntohs((hdr)->_v_hl_tos) >> 8) & 0x0f)
+#define IPH_TOS(hdr) (ntohs((hdr)->_v_hl_tos) & 0xff)
+#define IPH_LEN(hdr) ((hdr)->_len)
+#define IPH_ID(hdr) ((hdr)->_id)
+#define IPH_OFFSET(hdr) ((hdr)->_offset)
+#define IPH_TTL(hdr) ((hdr)->_ttl)
+#define IPH_PROTO(hdr) ((hdr)->_proto)
+#define IPH_CHKSUM(hdr) ((hdr)->_chksum)
+
+#define IPH_VHLTOS_SET(hdr, v, hl, tos) (hdr)->_v_hl_tos = (htons(((v) << 12) | ((hl) << 8) | (tos)))
+#define IPH_LEN_SET(hdr, len) (hdr)->_len = (len)
+#define IPH_ID_SET(hdr, id) (hdr)->_id = (id)
+#define IPH_OFFSET_SET(hdr, off) (hdr)->_offset = (off)
+#define IPH_TTL_SET(hdr, ttl) (hdr)->_ttl = (u8_t)(ttl)
+#define IPH_PROTO_SET(hdr, proto) (hdr)->_proto = (u8_t)(proto)
+#define IPH_CHKSUM_SET(hdr, chksum) (hdr)->_chksum = (chksum)
+
+/** The interface that provided the packet for the current callback invocation. */
+extern struct netif *current_netif;
+/** Header of the input packet currently being processed. */
+extern const struct ip_hdr *current_header;
+/** Source IP address of current_header */
+extern ip_addr_t current_iphdr_src;
+/** Destination IP address of current_header */
+extern ip_addr_t current_iphdr_dest;
+
+#define ip_init() /* Compatibility define, not init needed. */
+struct netif *ip_route(ip_addr_t *dest);
+err_t ip_input(struct pbuf *p, struct netif *inp);
+err_t ip_output(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
+ u8_t ttl, u8_t tos, u8_t proto);
+err_t ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
+ u8_t ttl, u8_t tos, u8_t proto,
+ struct netif *netif);
+#if LWIP_NETIF_HWADDRHINT
+err_t ip_output_hinted(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
+ u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint);
+#endif /* LWIP_NETIF_HWADDRHINT */
+#if IP_OPTIONS_SEND
+err_t ip_output_if_opt(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
+ u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options,
+ u16_t optlen);
+#endif /* IP_OPTIONS_SEND */
+/** Get the interface that received the current packet.
+ * This function must only be called from a receive callback (udp_recv,
+ * raw_recv, tcp_accept). It will return NULL otherwise. */
+#define ip_current_netif() (current_netif)
+/** Get the IP header of the current packet.
+ * This function must only be called from a receive callback (udp_recv,
+ * raw_recv, tcp_accept). It will return NULL otherwise. */
+#define ip_current_header() (current_header)
+/** Source IP address of current_header */
+#define ip_current_src_addr() (¤t_iphdr_src)
+/** Destination IP address of current_header */
+#define ip_current_dest_addr() (¤t_iphdr_dest)
+
+#if IP_DEBUG
+void ip_debug_print(struct pbuf *p);
+#else
+#define ip_debug_print(p)
+#endif /* IP_DEBUG */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LWIP_IP_H__ */
+
+
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_IP_ADDR_H__
+#define __LWIP_IP_ADDR_H__
+
+#include "lwip/opt.h"
+#include "lwip/def.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* This is the aligned version of ip_addr_t,
+ used as local variable, on the stack, etc. */
+struct ip_addr {
+ u32_t addr;
+};
+
+/* This is the packed version of ip_addr_t,
+ used in network headers that are itself packed */
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+struct ip_addr_packed {
+ PACK_STRUCT_FIELD(u32_t addr);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+
+/** ip_addr_t uses a struct for convenience only, so that the same defines can
+ * operate both on ip_addr_t as well as on ip_addr_p_t. */
+typedef struct ip_addr ip_addr_t;
+typedef struct ip_addr_packed ip_addr_p_t;
+
+/*
+ * struct ipaddr2 is used in the definition of the ARP packet format in
+ * order to support compilers that don't have structure packing.
+ */
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+struct ip_addr2 {
+ PACK_STRUCT_FIELD(u16_t addrw[2]);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+
+/* Forward declaration to not include netif.h */
+struct netif;
+
+extern const ip_addr_t ip_addr_any;
+extern const ip_addr_t ip_addr_broadcast;
+
+/** IP_ADDR_ can be used as a fixed IP address
+ * for the wildcard and the broadcast address
+ */
+#define IP_ADDR_ANY ((ip_addr_t *)&ip_addr_any)
+#define IP_ADDR_BROADCAST ((ip_addr_t *)&ip_addr_broadcast)
+
+/** 255.255.255.255 */
+#define IPADDR_NONE ((u32_t)0xffffffffUL)
+/** 127.0.0.1 */
+#define IPADDR_LOOPBACK ((u32_t)0x7f000001UL)
+/** 0.0.0.0 */
+#define IPADDR_ANY ((u32_t)0x00000000UL)
+/** 255.255.255.255 */
+#define IPADDR_BROADCAST ((u32_t)0xffffffffUL)
+
+/* Definitions of the bits in an Internet address integer.
+
+ On subnets, host and network parts are found according to
+ the subnet mask, not these masks. */
+#define IP_CLASSA(a) ((((u32_t)(a)) & 0x80000000UL) == 0)
+#define IP_CLASSA_NET 0xff000000
+#define IP_CLASSA_NSHIFT 24
+#define IP_CLASSA_HOST (0xffffffff & ~IP_CLASSA_NET)
+#define IP_CLASSA_MAX 128
+
+#define IP_CLASSB(a) ((((u32_t)(a)) & 0xc0000000UL) == 0x80000000UL)
+#define IP_CLASSB_NET 0xffff0000
+#define IP_CLASSB_NSHIFT 16
+#define IP_CLASSB_HOST (0xffffffff & ~IP_CLASSB_NET)
+#define IP_CLASSB_MAX 65536
+
+#define IP_CLASSC(a) ((((u32_t)(a)) & 0xe0000000UL) == 0xc0000000UL)
+#define IP_CLASSC_NET 0xffffff00
+#define IP_CLASSC_NSHIFT 8
+#define IP_CLASSC_HOST (0xffffffff & ~IP_CLASSC_NET)
+
+#define IP_CLASSD(a) (((u32_t)(a) & 0xf0000000UL) == 0xe0000000UL)
+#define IP_CLASSD_NET 0xf0000000 /* These ones aren't really */
+#define IP_CLASSD_NSHIFT 28 /* net and host fields, but */
+#define IP_CLASSD_HOST 0x0fffffff /* routing needn't know. */
+#define IP_MULTICAST(a) IP_CLASSD(a)
+
+#define IP_EXPERIMENTAL(a) (((u32_t)(a) & 0xf0000000UL) == 0xf0000000UL)
+#define IP_BADCLASS(a) (((u32_t)(a) & 0xf0000000UL) == 0xf0000000UL)
+
+#define IP_LOOPBACKNET 127 /* official! */
+
+
+#if BYTE_ORDER == BIG_ENDIAN
+/** Set an IP address given by the four byte-parts */
+#define IP4_ADDR(ipaddr, a,b,c,d) \
+ (ipaddr)->addr = ((u32_t)((a) & 0xff) << 24) | \
+ ((u32_t)((b) & 0xff) << 16) | \
+ ((u32_t)((c) & 0xff) << 8) | \
+ (u32_t)((d) & 0xff)
+#else
+/** Set an IP address given by the four byte-parts.
+ Little-endian version that prevents the use of htonl. */
+#define IP4_ADDR(ipaddr, a,b,c,d) \
+ (ipaddr)->addr = ((u32_t)((d) & 0xff) << 24) | \
+ ((u32_t)((c) & 0xff) << 16) | \
+ ((u32_t)((b) & 0xff) << 8) | \
+ (u32_t)((a) & 0xff)
+#endif
+
+/** MEMCPY-like copying of IP addresses where addresses are known to be
+ * 16-bit-aligned if the port is correctly configured (so a port could define
+ * this to copying 2 u16_t's) - no NULL-pointer-checking needed. */
+#ifndef IPADDR2_COPY
+#define IPADDR2_COPY(dest, src) SMEMCPY(dest, src, sizeof(ip_addr_t))
+#endif
+
+/** Copy IP address - faster than ip_addr_set: no NULL check */
+#define ip_addr_copy(dest, src) ((dest).addr = (src).addr)
+/** Safely copy one IP address to another (src may be NULL) */
+#define ip_addr_set(dest, src) ((dest)->addr = \
+ ((src) == NULL ? 0 : \
+ (src)->addr))
+/** Set complete address to zero */
+#define ip_addr_set_zero(ipaddr) ((ipaddr)->addr = 0)
+/** Set address to IPADDR_ANY (no need for htonl()) */
+#define ip_addr_set_any(ipaddr) ((ipaddr)->addr = IPADDR_ANY)
+/** Set address to loopback address */
+#define ip_addr_set_loopback(ipaddr) ((ipaddr)->addr = PP_HTONL(IPADDR_LOOPBACK))
+/** Safely copy one IP address to another and change byte order
+ * from host- to network-order. */
+#define ip_addr_set_hton(dest, src) ((dest)->addr = \
+ ((src) == NULL ? 0:\
+ htonl((src)->addr)))
+/** IPv4 only: set the IP address given as an u32_t */
+#define ip4_addr_set_u32(dest_ipaddr, src_u32) ((dest_ipaddr)->addr = (src_u32))
+/** IPv4 only: get the IP address as an u32_t */
+#define ip4_addr_get_u32(src_ipaddr) ((src_ipaddr)->addr)
+
+/** Get the network address by combining host address with netmask */
+#define ip_addr_get_network(target, host, netmask) ((target)->addr = ((host)->addr) & ((netmask)->addr))
+
+/**
+ * Determine if two address are on the same network.
+ *
+ * @arg addr1 IP address 1
+ * @arg addr2 IP address 2
+ * @arg mask network identifier mask
+ * @return !0 if the network identifiers of both address match
+ */
+#define ip_addr_netcmp(addr1, addr2, mask) (((addr1)->addr & \
+ (mask)->addr) == \
+ ((addr2)->addr & \
+ (mask)->addr))
+#define ip_addr_cmp(addr1, addr2) ((addr1)->addr == (addr2)->addr)
+
+#define ip_addr_isany(addr1) ((addr1) == NULL || (addr1)->addr == IPADDR_ANY)
+
+#define ip_addr_isbroadcast(ipaddr, netif) ip4_addr_isbroadcast((ipaddr)->addr, (netif))
+u8_t ip4_addr_isbroadcast(u32_t addr, const struct netif *netif);
+
+#define ip_addr_netmask_valid(netmask) ip4_addr_netmask_valid((netmask)->addr)
+u8_t ip4_addr_netmask_valid(u32_t netmask);
+
+#define ip_addr_ismulticast(addr1) (((addr1)->addr & PP_HTONL(0xf0000000UL)) == PP_HTONL(0xe0000000UL))
+
+#define ip_addr_islinklocal(addr1) (((addr1)->addr & PP_HTONL(0xffff0000UL)) == PP_HTONL(0xa9fe0000UL))
+
+#define ip_addr_debug_print(debug, ipaddr) \
+ LWIP_DEBUGF(debug, ("%"U16_F".%"U16_F".%"U16_F".%"U16_F, \
+ ipaddr != NULL ? ip4_addr1_16(ipaddr) : 0, \
+ ipaddr != NULL ? ip4_addr2_16(ipaddr) : 0, \
+ ipaddr != NULL ? ip4_addr3_16(ipaddr) : 0, \
+ ipaddr != NULL ? ip4_addr4_16(ipaddr) : 0))
+
+/* Get one byte from the 4-byte address */
+#define ip4_addr1(ipaddr) (((u8_t*)(ipaddr))[0])
+#define ip4_addr2(ipaddr) (((u8_t*)(ipaddr))[1])
+#define ip4_addr3(ipaddr) (((u8_t*)(ipaddr))[2])
+#define ip4_addr4(ipaddr) (((u8_t*)(ipaddr))[3])
+/* These are cast to u16_t, with the intent that they are often arguments
+ * to printf using the U16_F format from cc.h. */
+#define ip4_addr1_16(ipaddr) ((u16_t)ip4_addr1(ipaddr))
+#define ip4_addr2_16(ipaddr) ((u16_t)ip4_addr2(ipaddr))
+#define ip4_addr3_16(ipaddr) ((u16_t)ip4_addr3(ipaddr))
+#define ip4_addr4_16(ipaddr) ((u16_t)ip4_addr4(ipaddr))
+
+/** For backwards compatibility */
+#define ip_ntoa(ipaddr) ipaddr_ntoa(ipaddr)
+
+u32_t ipaddr_addr(const char *cp);
+int ipaddr_aton(const char *cp, ip_addr_t *addr);
+/** returns ptr to static buffer; not reentrant! */
+char *ipaddr_ntoa(const ip_addr_t *addr);
+char *ipaddr_ntoa_r(const ip_addr_t *addr, char *buf, int buflen);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LWIP_IP_ADDR_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Jani Monoses <jani@iv.ro>
+ *
+ */
+
+#ifndef __LWIP_IP_FRAG_H__
+#define __LWIP_IP_FRAG_H__
+
+#include "lwip/opt.h"
+#include "lwip/err.h"
+#include "lwip/pbuf.h"
+#include "lwip/netif.h"
+#include "lwip/ip_addr.h"
+#include "lwip/ip.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if IP_REASSEMBLY
+/* The IP reassembly timer interval in milliseconds. */
+#define IP_TMR_INTERVAL 1000
+
+/* IP reassembly helper struct.
+ * This is exported because memp needs to know the size.
+ */
+struct ip_reassdata {
+ struct ip_reassdata *next;
+ struct pbuf *p;
+ struct ip_hdr iphdr;
+ u16_t datagram_len;
+ u8_t flags;
+ u8_t timer;
+};
+
+void ip_reass_init(void);
+void ip_reass_tmr(void);
+struct pbuf * ip_reass(struct pbuf *p);
+#endif /* IP_REASSEMBLY */
+
+#if IP_FRAG
+#if !IP_FRAG_USES_STATIC_BUF && !LWIP_NETIF_TX_SINGLE_PBUF
+/** A custom pbuf that holds a reference to another pbuf, which is freed
+ * when this custom pbuf is freed. This is used to create a custom PBUF_REF
+ * that points into the original pbuf. */
+struct pbuf_custom_ref {
+ /** 'base class' */
+ struct pbuf_custom pc;
+ /** pointer to the original pbuf that is referenced */
+ struct pbuf *original;
+};
+#endif /* !IP_FRAG_USES_STATIC_BUF && !LWIP_NETIF_TX_SINGLE_PBUF */
+
+err_t ip_frag(struct pbuf *p, struct netif *netif, ip_addr_t *dest);
+#endif /* IP_FRAG */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LWIP_IP_FRAG_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_API_H__
+#define __LWIP_API_H__
+
+#include "lwip/opt.h"
+
+#if LWIP_NETCONN /* don't build if not configured for use in lwipopts.h */
+
+#include <stddef.h> /* for size_t */
+
+#include "lwip/netbuf.h"
+#include "lwip/sys.h"
+#include "lwip/ip_addr.h"
+#include "lwip/err.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Throughout this file, IP addresses and port numbers are expected to be in
+ * the same byte order as in the corresponding pcb.
+ */
+
+/* Flags for netconn_write (u8_t) */
+#define NETCONN_NOFLAG 0x00
+#define NETCONN_NOCOPY 0x00 /* Only for source code compatibility */
+#define NETCONN_COPY 0x01
+#define NETCONN_MORE 0x02
+#define NETCONN_DONTBLOCK 0x04
+
+/* Flags for struct netconn.flags (u8_t) */
+/** TCP: when data passed to netconn_write doesn't fit into the send buffer,
+ this temporarily stores whether to wake up the original application task
+ if data couldn't be sent in the first try. */
+#define NETCONN_FLAG_WRITE_DELAYED 0x01
+/** Should this netconn avoid blocking? */
+#define NETCONN_FLAG_NON_BLOCKING 0x02
+/** Was the last connect action a non-blocking one? */
+#define NETCONN_FLAG_IN_NONBLOCKING_CONNECT 0x04
+/** If this is set, a TCP netconn must call netconn_recved() to update
+ the TCP receive window (done automatically if not set). */
+#define NETCONN_FLAG_NO_AUTO_RECVED 0x08
+/** If a nonblocking write has been rejected before, poll_tcp needs to
+ check if the netconn is writable again */
+#define NETCONN_FLAG_CHECK_WRITESPACE 0x10
+
+
+/* Helpers to process several netconn_types by the same code */
+#define NETCONNTYPE_GROUP(t) (t&0xF0)
+#define NETCONNTYPE_DATAGRAM(t) (t&0xE0)
+
+/** Protocol family and type of the netconn */
+enum netconn_type {
+ NETCONN_INVALID = 0,
+ /* NETCONN_TCP Group */
+ NETCONN_TCP = 0x10,
+ /* NETCONN_UDP Group */
+ NETCONN_UDP = 0x20,
+ NETCONN_UDPLITE = 0x21,
+ NETCONN_UDPNOCHKSUM= 0x22,
+ /* NETCONN_RAW Group */
+ NETCONN_RAW = 0x40
+};
+
+/** Current state of the netconn. Non-TCP netconns are always
+ * in state NETCONN_NONE! */
+enum netconn_state {
+ NETCONN_NONE,
+ NETCONN_WRITE,
+ NETCONN_LISTEN,
+ NETCONN_CONNECT,
+ NETCONN_CLOSE
+};
+
+/** Use to inform the callback function about changes */
+enum netconn_evt {
+ NETCONN_EVT_RCVPLUS,
+ NETCONN_EVT_RCVMINUS,
+ NETCONN_EVT_SENDPLUS,
+ NETCONN_EVT_SENDMINUS,
+ NETCONN_EVT_ERROR
+};
+
+#if LWIP_IGMP
+/** Used for netconn_join_leave_group() */
+enum netconn_igmp {
+ NETCONN_JOIN,
+ NETCONN_LEAVE
+};
+#endif /* LWIP_IGMP */
+
+/* forward-declare some structs to avoid to include their headers */
+struct ip_pcb;
+struct tcp_pcb;
+struct udp_pcb;
+struct raw_pcb;
+struct netconn;
+struct api_msg_msg;
+
+/** A callback prototype to inform about events for a netconn */
+typedef void (* netconn_callback)(struct netconn *, enum netconn_evt, u16_t len);
+
+/** A netconn descriptor */
+struct netconn {
+ /** type of the netconn (TCP, UDP or RAW) */
+ enum netconn_type type;
+ /** current state of the netconn */
+ enum netconn_state state;
+ /** the lwIP internal protocol control block */
+ union {
+ struct ip_pcb *ip;
+ struct tcp_pcb *tcp;
+ struct udp_pcb *udp;
+ struct raw_pcb *raw;
+ } pcb;
+ /** the last error this netconn had */
+ err_t last_err;
+ /** sem that is used to synchroneously execute functions in the core context */
+ sys_sem_t op_completed;
+ /** mbox where received packets are stored until they are fetched
+ by the netconn application thread (can grow quite big) */
+ sys_mbox_t recvmbox;
+#if LWIP_TCP
+ /** mbox where new connections are stored until processed
+ by the application thread */
+ sys_mbox_t acceptmbox;
+#endif /* LWIP_TCP */
+ /** only used for socket layer */
+#if LWIP_SOCKET
+ int socket;
+#endif /* LWIP_SOCKET */
+#if LWIP_SO_RCVTIMEO
+ /** timeout to wait for new data to be received
+ (or connections to arrive for listening netconns) */
+ int recv_timeout;
+#endif /* LWIP_SO_RCVTIMEO */
+#if LWIP_SO_RCVBUF
+ /** maximum amount of bytes queued in recvmbox
+ not used for TCP: adjust TCP_WND instead! */
+ int recv_bufsize;
+ /** number of bytes currently in recvmbox to be received,
+ tested against recv_bufsize to limit bytes on recvmbox
+ for UDP and RAW, used for FIONREAD */
+ s16_t recv_avail;
+#endif /* LWIP_SO_RCVBUF */
+ /** flags holding more netconn-internal state, see NETCONN_FLAG_* defines */
+ u8_t flags;
+#if LWIP_TCP
+ /** TCP: when data passed to netconn_write doesn't fit into the send buffer,
+ this temporarily stores how much is already sent. */
+ size_t write_offset;
+ /** TCP: when data passed to netconn_write doesn't fit into the send buffer,
+ this temporarily stores the message.
+ Also used during connect and close. */
+ struct api_msg_msg *current_msg;
+#endif /* LWIP_TCP */
+ /** A callback function that is informed about events for this netconn */
+ netconn_callback callback;
+};
+
+/** Register an Network connection event */
+#define API_EVENT(c,e,l) if (c->callback) { \
+ (*c->callback)(c, e, l); \
+ }
+
+/** Set conn->last_err to err but don't overwrite fatal errors */
+#define NETCONN_SET_SAFE_ERR(conn, err) do { \
+ SYS_ARCH_DECL_PROTECT(lev); \
+ SYS_ARCH_PROTECT(lev); \
+ if (!ERR_IS_FATAL((conn)->last_err)) { \
+ (conn)->last_err = err; \
+ } \
+ SYS_ARCH_UNPROTECT(lev); \
+} while(0);
+
+/* Network connection functions: */
+#define netconn_new(t) netconn_new_with_proto_and_callback(t, 0, NULL)
+#define netconn_new_with_callback(t, c) netconn_new_with_proto_and_callback(t, 0, c)
+struct
+netconn *netconn_new_with_proto_and_callback(enum netconn_type t, u8_t proto,
+ netconn_callback callback);
+err_t netconn_delete(struct netconn *conn);
+/** Get the type of a netconn (as enum netconn_type). */
+#define netconn_type(conn) (conn->type)
+
+err_t netconn_getaddr(struct netconn *conn, ip_addr_t *addr,
+ u16_t *port, u8_t local);
+#define netconn_peer(c,i,p) netconn_getaddr(c,i,p,0)
+#define netconn_addr(c,i,p) netconn_getaddr(c,i,p,1)
+
+err_t netconn_bind(struct netconn *conn, ip_addr_t *addr, u16_t port);
+err_t netconn_connect(struct netconn *conn, ip_addr_t *addr, u16_t port);
+err_t netconn_disconnect (struct netconn *conn);
+err_t netconn_listen_with_backlog(struct netconn *conn, u8_t backlog);
+#define netconn_listen(conn) netconn_listen_with_backlog(conn, TCP_DEFAULT_LISTEN_BACKLOG)
+err_t netconn_accept(struct netconn *conn, struct netconn **new_conn);
+err_t netconn_recv(struct netconn *conn, struct netbuf **new_buf);
+err_t netconn_recv_tcp_pbuf(struct netconn *conn, struct pbuf **new_buf);
+void netconn_recved(struct netconn *conn, u32_t length);
+err_t netconn_sendto(struct netconn *conn, struct netbuf *buf,
+ ip_addr_t *addr, u16_t port);
+err_t netconn_send(struct netconn *conn, struct netbuf *buf);
+err_t netconn_write(struct netconn *conn, const void *dataptr, size_t size,
+ u8_t apiflags);
+err_t netconn_close(struct netconn *conn);
+err_t netconn_shutdown(struct netconn *conn, u8_t shut_rx, u8_t shut_tx);
+
+#if LWIP_IGMP
+err_t netconn_join_leave_group(struct netconn *conn, ip_addr_t *multiaddr,
+ ip_addr_t *netif_addr, enum netconn_igmp join_or_leave);
+#endif /* LWIP_IGMP */
+#if LWIP_DNS
+err_t netconn_gethostbyname(const char *name, ip_addr_t *addr);
+#endif /* LWIP_DNS */
+
+#define netconn_err(conn) ((conn)->last_err)
+#define netconn_recv_bufsize(conn) ((conn)->recv_bufsize)
+
+/** Set the blocking status of netconn calls (@todo: write/send is missing) */
+#define netconn_set_nonblocking(conn, val) do { if(val) { \
+ (conn)->flags |= NETCONN_FLAG_NON_BLOCKING; \
+} else { \
+ (conn)->flags &= ~ NETCONN_FLAG_NON_BLOCKING; }} while(0)
+/** Get the blocking status of netconn calls (@todo: write/send is missing) */
+#define netconn_is_nonblocking(conn) (((conn)->flags & NETCONN_FLAG_NON_BLOCKING) != 0)
+
+/** TCP: Set the no-auto-recved status of netconn calls (see NETCONN_FLAG_NO_AUTO_RECVED) */
+#define netconn_set_noautorecved(conn, val) do { if(val) { \
+ (conn)->flags |= NETCONN_FLAG_NO_AUTO_RECVED; \
+} else { \
+ (conn)->flags &= ~ NETCONN_FLAG_NO_AUTO_RECVED; }} while(0)
+/** TCP: Get the no-auto-recved status of netconn calls (see NETCONN_FLAG_NO_AUTO_RECVED) */
+#define netconn_get_noautorecved(conn) (((conn)->flags & NETCONN_FLAG_NO_AUTO_RECVED) != 0)
+
+#if LWIP_SO_RCVTIMEO
+/** Set the receive timeout in milliseconds */
+#define netconn_set_recvtimeout(conn, timeout) ((conn)->recv_timeout = (timeout))
+/** Get the receive timeout in milliseconds */
+#define netconn_get_recvtimeout(conn) ((conn)->recv_timeout)
+#endif /* LWIP_SO_RCVTIMEO */
+#if LWIP_SO_RCVBUF
+/** Set the receive buffer in bytes */
+#define netconn_set_recvbufsize(conn, recvbufsize) ((conn)->recv_bufsize = (recvbufsize))
+/** Get the receive buffer in bytes */
+#define netconn_get_recvbufsize(conn) ((conn)->recv_bufsize)
+#endif /* LWIP_SO_RCVBUF*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_NETCONN */
+
+#endif /* __LWIP_API_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_API_MSG_H__
+#define __LWIP_API_MSG_H__
+
+#include "lwip/opt.h"
+
+#if LWIP_NETCONN /* don't build if not configured for use in lwipopts.h */
+
+#include <stddef.h> /* for size_t */
+
+#include "lwip/ip_addr.h"
+#include "lwip/err.h"
+#include "lwip/sys.h"
+#include "lwip/igmp.h"
+#include "lwip/api.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* For the netconn API, these values are use as a bitmask! */
+#define NETCONN_SHUT_RD 1
+#define NETCONN_SHUT_WR 2
+#define NETCONN_SHUT_RDWR (NETCONN_SHUT_RD | NETCONN_SHUT_WR)
+
+/* IP addresses and port numbers are expected to be in
+ * the same byte order as in the corresponding pcb.
+ */
+/** This struct includes everything that is necessary to execute a function
+ for a netconn in another thread context (mainly used to process netconns
+ in the tcpip_thread context to be thread safe). */
+struct api_msg_msg {
+ /** The netconn which to process - always needed: it includes the semaphore
+ which is used to block the application thread until the function finished. */
+ struct netconn *conn;
+ /** The return value of the function executed in tcpip_thread. */
+ err_t err;
+ /** Depending on the executed function, one of these union members is used */
+ union {
+ /** used for do_send */
+ struct netbuf *b;
+ /** used for do_newconn */
+ struct {
+ u8_t proto;
+ } n;
+ /** used for do_bind and do_connect */
+ struct {
+ ip_addr_t *ipaddr;
+ u16_t port;
+ } bc;
+ /** used for do_getaddr */
+ struct {
+ ip_addr_t *ipaddr;
+ u16_t *port;
+ u8_t local;
+ } ad;
+ /** used for do_write */
+ struct {
+ const void *dataptr;
+ size_t len;
+ u8_t apiflags;
+ } w;
+ /** used for do_recv */
+ struct {
+ u32_t len;
+ } r;
+ /** used for do_close (/shutdown) */
+ struct {
+ u8_t shut;
+ } sd;
+#if LWIP_IGMP
+ /** used for do_join_leave_group */
+ struct {
+ ip_addr_t *multiaddr;
+ ip_addr_t *netif_addr;
+ enum netconn_igmp join_or_leave;
+ } jl;
+#endif /* LWIP_IGMP */
+#if TCP_LISTEN_BACKLOG
+ struct {
+ u8_t backlog;
+ } lb;
+#endif /* TCP_LISTEN_BACKLOG */
+ } msg;
+};
+
+/** This struct contains a function to execute in another thread context and
+ a struct api_msg_msg that serves as an argument for this function.
+ This is passed to tcpip_apimsg to execute functions in tcpip_thread context. */
+struct api_msg {
+ /** function to execute in tcpip_thread context */
+ void (* function)(struct api_msg_msg *msg);
+ /** arguments for this function */
+ struct api_msg_msg msg;
+};
+
+#if LWIP_DNS
+/** As do_gethostbyname requires more arguments but doesn't require a netconn,
+ it has its own struct (to avoid struct api_msg getting bigger than necessary).
+ do_gethostbyname must be called using tcpip_callback instead of tcpip_apimsg
+ (see netconn_gethostbyname). */
+struct dns_api_msg {
+ /** Hostname to query or dotted IP address string */
+ const char *name;
+ /** Rhe resolved address is stored here */
+ ip_addr_t *addr;
+ /** This semaphore is posted when the name is resolved, the application thread
+ should wait on it. */
+ sys_sem_t *sem;
+ /** Errors are given back here */
+ err_t *err;
+};
+#endif /* LWIP_DNS */
+
+void do_newconn ( struct api_msg_msg *msg);
+void do_delconn ( struct api_msg_msg *msg);
+void do_bind ( struct api_msg_msg *msg);
+void do_connect ( struct api_msg_msg *msg);
+void do_disconnect ( struct api_msg_msg *msg);
+void do_listen ( struct api_msg_msg *msg);
+void do_send ( struct api_msg_msg *msg);
+void do_recv ( struct api_msg_msg *msg);
+void do_write ( struct api_msg_msg *msg);
+void do_getaddr ( struct api_msg_msg *msg);
+void do_close ( struct api_msg_msg *msg);
+void do_shutdown ( struct api_msg_msg *msg);
+#if LWIP_IGMP
+void do_join_leave_group( struct api_msg_msg *msg);
+#endif /* LWIP_IGMP */
+
+#if LWIP_DNS
+void do_gethostbyname(void *arg);
+#endif /* LWIP_DNS */
+
+struct netconn* netconn_alloc(enum netconn_type t, netconn_callback callback);
+void netconn_free(struct netconn *conn);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_NETCONN */
+
+#endif /* __LWIP_API_MSG_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_ARCH_H__
+#define __LWIP_ARCH_H__
+
+#ifndef LITTLE_ENDIAN
+#define LITTLE_ENDIAN 1234
+#endif
+
+#ifndef BIG_ENDIAN
+#define BIG_ENDIAN 4321
+#endif
+
+#include "arch/cc.h"
+
+/** Temporary: define format string for size_t if not defined in cc.h */
+#ifndef SZT_F
+#define SZT_F U32_F
+#endif /* SZT_F */
+/** Temporary upgrade helper: define format string for u8_t as hex if not
+ defined in cc.h */
+#ifndef X8_F
+#define X8_F "02x"
+#endif /* X8_F */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef PACK_STRUCT_BEGIN
+#define PACK_STRUCT_BEGIN
+#endif /* PACK_STRUCT_BEGIN */
+
+#ifndef PACK_STRUCT_END
+#define PACK_STRUCT_END
+#endif /* PACK_STRUCT_END */
+
+#ifndef PACK_STRUCT_FIELD
+#define PACK_STRUCT_FIELD(x) x
+#endif /* PACK_STRUCT_FIELD */
+
+
+#ifndef LWIP_UNUSED_ARG
+#define LWIP_UNUSED_ARG(x) (void)x
+#endif /* LWIP_UNUSED_ARG */
+
+
+#ifdef LWIP_PROVIDE_ERRNO
+
+#define EPERM 1 /* Operation not permitted */
+#define ENOENT 2 /* No such file or directory */
+#define ESRCH 3 /* No such process */
+#define EINTR 4 /* Interrupted system call */
+#define EIO 5 /* I/O error */
+#define ENXIO 6 /* No such device or address */
+#define E2BIG 7 /* Arg list too long */
+#define ENOEXEC 8 /* Exec format error */
+#define EBADF 9 /* Bad file number */
+#define ECHILD 10 /* No child processes */
+#define EAGAIN 11 /* Try again */
+#define ENOMEM 12 /* Out of memory */
+#define EACCES 13 /* Permission denied */
+#define EFAULT 14 /* Bad address */
+#define ENOTBLK 15 /* Block device required */
+#define EBUSY 16 /* Device or resource busy */
+#define EEXIST 17 /* File exists */
+#define EXDEV 18 /* Cross-device link */
+#define ENODEV 19 /* No such device */
+#define ENOTDIR 20 /* Not a directory */
+#define EISDIR 21 /* Is a directory */
+#define EINVAL 22 /* Invalid argument */
+#define ENFILE 23 /* File table overflow */
+#define EMFILE 24 /* Too many open files */
+#define ENOTTY 25 /* Not a typewriter */
+#define ETXTBSY 26 /* Text file busy */
+#define EFBIG 27 /* File too large */
+#define ENOSPC 28 /* No space left on device */
+#define ESPIPE 29 /* Illegal seek */
+#define EROFS 30 /* Read-only file system */
+#define EMLINK 31 /* Too many links */
+#define EPIPE 32 /* Broken pipe */
+#define EDOM 33 /* Math argument out of domain of func */
+#define ERANGE 34 /* Math result not representable */
+#define EDEADLK 35 /* Resource deadlock would occur */
+#define ENAMETOOLONG 36 /* File name too long */
+#define ENOLCK 37 /* No record locks available */
+#define ENOSYS 38 /* Function not implemented */
+#define ENOTEMPTY 39 /* Directory not empty */
+#define ELOOP 40 /* Too many symbolic links encountered */
+#define EWOULDBLOCK EAGAIN /* Operation would block */
+#define ENOMSG 42 /* No message of desired type */
+#define EIDRM 43 /* Identifier removed */
+#define ECHRNG 44 /* Channel number out of range */
+#define EL2NSYNC 45 /* Level 2 not synchronized */
+#define EL3HLT 46 /* Level 3 halted */
+#define EL3RST 47 /* Level 3 reset */
+#define ELNRNG 48 /* Link number out of range */
+#define EUNATCH 49 /* Protocol driver not attached */
+#define ENOCSI 50 /* No CSI structure available */
+#define EL2HLT 51 /* Level 2 halted */
+#define EBADE 52 /* Invalid exchange */
+#define EBADR 53 /* Invalid request descriptor */
+#define EXFULL 54 /* Exchange full */
+#define ENOANO 55 /* No anode */
+#define EBADRQC 56 /* Invalid request code */
+#define EBADSLT 57 /* Invalid slot */
+
+#define EDEADLOCK EDEADLK
+
+#define EBFONT 59 /* Bad font file format */
+#define ENOSTR 60 /* Device not a stream */
+#define ENODATA 61 /* No data available */
+#define ETIME 62 /* Timer expired */
+#define ENOSR 63 /* Out of streams resources */
+#define ENONET 64 /* Machine is not on the network */
+#define ENOPKG 65 /* Package not installed */
+#define EREMOTE 66 /* Object is remote */
+#define ENOLINK 67 /* Link has been severed */
+#define EADV 68 /* Advertise error */
+#define ESRMNT 69 /* Srmount error */
+#define ECOMM 70 /* Communication error on send */
+#define EPROTO 71 /* Protocol error */
+#define EMULTIHOP 72 /* Multihop attempted */
+#define EDOTDOT 73 /* RFS specific error */
+#define EBADMSG 74 /* Not a data message */
+#define EOVERFLOW 75 /* Value too large for defined data type */
+#define ENOTUNIQ 76 /* Name not unique on network */
+#define EBADFD 77 /* File descriptor in bad state */
+#define EREMCHG 78 /* Remote address changed */
+#define ELIBACC 79 /* Can not access a needed shared library */
+#define ELIBBAD 80 /* Accessing a corrupted shared library */
+#define ELIBSCN 81 /* .lib section in a.out corrupted */
+#define ELIBMAX 82 /* Attempting to link in too many shared libraries */
+#define ELIBEXEC 83 /* Cannot exec a shared library directly */
+#define EILSEQ 84 /* Illegal byte sequence */
+#define ERESTART 85 /* Interrupted system call should be restarted */
+#define ESTRPIPE 86 /* Streams pipe error */
+#define EUSERS 87 /* Too many users */
+#define ENOTSOCK 88 /* Socket operation on non-socket */
+#define EDESTADDRREQ 89 /* Destination address required */
+#define EMSGSIZE 90 /* Message too long */
+#define EPROTOTYPE 91 /* Protocol wrong type for socket */
+#define ENOPROTOOPT 92 /* Protocol not available */
+#define EPROTONOSUPPORT 93 /* Protocol not supported */
+#define ESOCKTNOSUPPORT 94 /* Socket type not supported */
+#define EOPNOTSUPP 95 /* Operation not supported on transport endpoint */
+#define EPFNOSUPPORT 96 /* Protocol family not supported */
+#define EAFNOSUPPORT 97 /* Address family not supported by protocol */
+#define EADDRINUSE 98 /* Address already in use */
+#define EADDRNOTAVAIL 99 /* Cannot assign requested address */
+#define ENETDOWN 100 /* Network is down */
+#define ENETUNREACH 101 /* Network is unreachable */
+#define ENETRESET 102 /* Network dropped connection because of reset */
+#define ECONNABORTED 103 /* Software caused connection abort */
+#define ECONNRESET 104 /* Connection reset by peer */
+#define ENOBUFS 105 /* No buffer space available */
+#define EISCONN 106 /* Transport endpoint is already connected */
+#define ENOTCONN 107 /* Transport endpoint is not connected */
+#define ESHUTDOWN 108 /* Cannot send after transport endpoint shutdown */
+#define ETOOMANYREFS 109 /* Too many references: cannot splice */
+#define ETIMEDOUT 110 /* Connection timed out */
+#define ECONNREFUSED 111 /* Connection refused */
+#define EHOSTDOWN 112 /* Host is down */
+#define EHOSTUNREACH 113 /* No route to host */
+#define EALREADY 114 /* Operation already in progress */
+#define EINPROGRESS 115 /* Operation now in progress */
+#define ESTALE 116 /* Stale NFS file handle */
+#define EUCLEAN 117 /* Structure needs cleaning */
+#define ENOTNAM 118 /* Not a XENIX named type file */
+#define ENAVAIL 119 /* No XENIX semaphores available */
+#define EISNAM 120 /* Is a named type file */
+#define EREMOTEIO 121 /* Remote I/O error */
+#define EDQUOT 122 /* Quota exceeded */
+
+#define ENOMEDIUM 123 /* No medium found */
+#define EMEDIUMTYPE 124 /* Wrong medium type */
+
+
+#define ENSROK 0 /* DNS server returned answer with no data */
+#define ENSRNODATA 160 /* DNS server returned answer with no data */
+#define ENSRFORMERR 161 /* DNS server claims query was misformatted */
+#define ENSRSERVFAIL 162 /* DNS server returned general failure */
+#define ENSRNOTFOUND 163 /* Domain name not found */
+#define ENSRNOTIMP 164 /* DNS server does not implement requested operation */
+#define ENSRREFUSED 165 /* DNS server refused query */
+#define ENSRBADQUERY 166 /* Misformatted DNS query */
+#define ENSRBADNAME 167 /* Misformatted domain name */
+#define ENSRBADFAMILY 168 /* Unsupported address family */
+#define ENSRBADRESP 169 /* Misformatted DNS reply */
+#define ENSRCONNREFUSED 170 /* Could not contact DNS servers */
+#define ENSRTIMEOUT 171 /* Timeout while contacting DNS servers */
+#define ENSROF 172 /* End of file */
+#define ENSRFILE 173 /* Error reading file */
+#define ENSRNOMEM 174 /* Out of memory */
+#define ENSRDESTRUCTION 175 /* Application terminated lookup */
+#define ENSRQUERYDOMAINTOOLONG 176 /* Domain name is too long */
+#define ENSRCNAMELOOP 177 /* Domain name is too long */
+
+#ifndef errno
+extern int errno;
+#endif
+
+#endif /* LWIP_PROVIDE_ERRNO */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LWIP_ARCH_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_DEBUG_H__
+#define __LWIP_DEBUG_H__
+
+#include "lwip/arch.h"
+
+/** lower two bits indicate debug level
+ * - 0 all
+ * - 1 warning
+ * - 2 serious
+ * - 3 severe
+ */
+#define LWIP_DBG_LEVEL_ALL 0x00
+#define LWIP_DBG_LEVEL_OFF LWIP_DBG_LEVEL_ALL /* compatibility define only */
+#define LWIP_DBG_LEVEL_WARNING 0x01 /* bad checksums, dropped packets, ... */
+#define LWIP_DBG_LEVEL_SERIOUS 0x02 /* memory allocation failures, ... */
+#define LWIP_DBG_LEVEL_SEVERE 0x03
+#define LWIP_DBG_MASK_LEVEL 0x03
+
+/** flag for LWIP_DEBUGF to enable that debug message */
+#define LWIP_DBG_ON 0x80U
+/** flag for LWIP_DEBUGF to disable that debug message */
+#define LWIP_DBG_OFF 0x00U
+
+/** flag for LWIP_DEBUGF indicating a tracing message (to follow program flow) */
+#define LWIP_DBG_TRACE 0x40U
+/** flag for LWIP_DEBUGF indicating a state debug message (to follow module states) */
+#define LWIP_DBG_STATE 0x20U
+/** flag for LWIP_DEBUGF indicating newly added code, not thoroughly tested yet */
+#define LWIP_DBG_FRESH 0x10U
+/** flag for LWIP_DEBUGF to halt after printing this debug message */
+#define LWIP_DBG_HALT 0x08U
+
+#ifndef LWIP_NOASSERT
+#define LWIP_ASSERT(message, assertion) do { if(!(assertion)) \
+ LWIP_PLATFORM_ASSERT(message); } while(0)
+#else /* LWIP_NOASSERT */
+#define LWIP_ASSERT(message, assertion)
+#endif /* LWIP_NOASSERT */
+
+/** if "expression" isn't true, then print "message" and execute "handler" expression */
+#ifndef LWIP_ERROR
+#define LWIP_ERROR(message, expression, handler) do { if (!(expression)) { \
+ LWIP_PLATFORM_ASSERT(message); handler;}} while(0)
+#endif /* LWIP_ERROR */
+
+#ifdef LWIP_DEBUG
+/** print debug message only if debug message type is enabled...
+ * AND is of correct type AND is at least LWIP_DBG_LEVEL
+ */
+#define LWIP_DEBUGF(debug, message) do { \
+ if ( \
+ ((debug) & LWIP_DBG_ON) && \
+ ((debug) & LWIP_DBG_TYPES_ON) && \
+ ((s16_t)((debug) & LWIP_DBG_MASK_LEVEL) >= LWIP_DBG_MIN_LEVEL)) { \
+ LWIP_PLATFORM_DIAG(message); \
+ if ((debug) & LWIP_DBG_HALT) { \
+ while(1); \
+ } \
+ } \
+ } while(0)
+
+#else /* LWIP_DEBUG */
+#define LWIP_DEBUGF(debug, message)
+#endif /* LWIP_DEBUG */
+
+#endif /* __LWIP_DEBUG_H__ */
+
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_DEF_H__
+#define __LWIP_DEF_H__
+
+/* arch.h might define NULL already */
+#include "lwip/arch.h"
+#include "lwip/opt.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define LWIP_MAX(x , y) (((x) > (y)) ? (x) : (y))
+#define LWIP_MIN(x , y) (((x) < (y)) ? (x) : (y))
+
+#ifndef NULL
+#define NULL ((void *)0)
+#endif
+
+/** Get the absolute difference between 2 u32_t values (correcting overflows)
+ * 'a' is expected to be 'higher' (without overflow) than 'b'. */
+#define LWIP_U32_DIFF(a, b) (((a) >= (b)) ? ((a) - (b)) : (((a) + ((b) ^ 0xFFFFFFFF) + 1)))
+
+/* Endianess-optimized shifting of two u8_t to create one u16_t */
+#if BYTE_ORDER == LITTLE_ENDIAN
+#define LWIP_MAKE_U16(a, b) ((a << 8) | b)
+#else
+#define LWIP_MAKE_U16(a, b) ((b << 8) | a)
+#endif
+
+#ifndef LWIP_PLATFORM_BYTESWAP
+#define LWIP_PLATFORM_BYTESWAP 0
+#endif
+
+#ifndef LWIP_PREFIX_BYTEORDER_FUNCS
+/* workaround for naming collisions on some platforms */
+
+#ifdef htons
+#undef htons
+#endif /* htons */
+#ifdef htonl
+#undef htonl
+#endif /* htonl */
+#ifdef ntohs
+#undef ntohs
+#endif /* ntohs */
+#ifdef ntohl
+#undef ntohl
+#endif /* ntohl */
+
+#define htons(x) lwip_htons(x)
+#define ntohs(x) lwip_ntohs(x)
+#define htonl(x) lwip_htonl(x)
+#define ntohl(x) lwip_ntohl(x)
+#endif /* LWIP_PREFIX_BYTEORDER_FUNCS */
+
+#if BYTE_ORDER == BIG_ENDIAN
+#define lwip_htons(x) (x)
+#define lwip_ntohs(x) (x)
+#define lwip_htonl(x) (x)
+#define lwip_ntohl(x) (x)
+#define PP_HTONS(x) (x)
+#define PP_NTOHS(x) (x)
+#define PP_HTONL(x) (x)
+#define PP_NTOHL(x) (x)
+#else /* BYTE_ORDER != BIG_ENDIAN */
+#if LWIP_PLATFORM_BYTESWAP
+#define lwip_htons(x) LWIP_PLATFORM_HTONS(x)
+#define lwip_ntohs(x) LWIP_PLATFORM_HTONS(x)
+#define lwip_htonl(x) LWIP_PLATFORM_HTONL(x)
+#define lwip_ntohl(x) LWIP_PLATFORM_HTONL(x)
+#else /* LWIP_PLATFORM_BYTESWAP */
+u16_t lwip_htons(u16_t x);
+u16_t lwip_ntohs(u16_t x);
+u32_t lwip_htonl(u32_t x);
+u32_t lwip_ntohl(u32_t x);
+#endif /* LWIP_PLATFORM_BYTESWAP */
+
+/* These macros should be calculated by the preprocessor and are used
+ with compile-time constants only (so that there is no little-endian
+ overhead at runtime). */
+#define PP_HTONS(x) ((((x) & 0xff) << 8) | (((x) & 0xff00) >> 8))
+#define PP_NTOHS(x) PP_HTONS(x)
+#define PP_HTONL(x) ((((x) & 0xff) << 24) | \
+ (((x) & 0xff00) << 8) | \
+ (((x) & 0xff0000UL) >> 8) | \
+ (((x) & 0xff000000UL) >> 24))
+#define PP_NTOHL(x) PP_HTONL(x)
+
+#endif /* BYTE_ORDER == BIG_ENDIAN */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LWIP_DEF_H__ */
+
--- /dev/null
+/** @file
+ */
+
+#ifndef __LWIP_DHCP_H__
+#define __LWIP_DHCP_H__
+
+#include "lwip/opt.h"
+
+#if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/netif.h"
+#include "lwip/udp.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** period (in seconds) of the application calling dhcp_coarse_tmr() */
+#define DHCP_COARSE_TIMER_SECS 60
+/** period (in milliseconds) of the application calling dhcp_coarse_tmr() */
+#define DHCP_COARSE_TIMER_MSECS (DHCP_COARSE_TIMER_SECS * 1000UL)
+/** period (in milliseconds) of the application calling dhcp_fine_tmr() */
+#define DHCP_FINE_TIMER_MSECS 500
+
+#define DHCP_CHADDR_LEN 16U
+#define DHCP_SNAME_LEN 64U
+#define DHCP_FILE_LEN 128U
+
+struct dhcp
+{
+ /** transaction identifier of last sent request */
+ u32_t xid;
+ /** our connection to the DHCP server */
+ struct udp_pcb *pcb;
+ /** incoming msg */
+ struct dhcp_msg *msg_in;
+ /** current DHCP state machine state */
+ u8_t state;
+ /** retries of current request */
+ u8_t tries;
+#if LWIP_DHCP_AUTOIP_COOP
+ u8_t autoip_coop_state;
+#endif
+ u8_t subnet_mask_given;
+
+ struct pbuf *p_out; /* pbuf of outcoming msg */
+ struct dhcp_msg *msg_out; /* outgoing msg */
+ u16_t options_out_len; /* outgoing msg options length */
+ u16_t request_timeout; /* #ticks with period DHCP_FINE_TIMER_SECS for request timeout */
+ u16_t t1_timeout; /* #ticks with period DHCP_COARSE_TIMER_SECS for renewal time */
+ u16_t t2_timeout; /* #ticks with period DHCP_COARSE_TIMER_SECS for rebind time */
+ ip_addr_t server_ip_addr; /* dhcp server address that offered this lease */
+ ip_addr_t offered_ip_addr;
+ ip_addr_t offered_sn_mask;
+ ip_addr_t offered_gw_addr;
+
+ u32_t offered_t0_lease; /* lease period (in seconds) */
+ u32_t offered_t1_renew; /* recommended renew time (usually 50% of lease period) */
+ u32_t offered_t2_rebind; /* recommended rebind time (usually 66% of lease period) */
+ /* @todo: LWIP_DHCP_BOOTP_FILE configuration option?
+ integrate with possible TFTP-client for booting? */
+#if LWIP_DHCP_BOOTP_FILE
+ ip_addr_t offered_si_addr;
+ char boot_file_name[DHCP_FILE_LEN];
+#endif /* LWIP_DHCP_BOOTPFILE */
+};
+
+/* MUST be compiled with "pack structs" or equivalent! */
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+/** minimum set of fields of any DHCP message */
+struct dhcp_msg
+{
+ PACK_STRUCT_FIELD(u8_t op);
+ PACK_STRUCT_FIELD(u8_t htype);
+ PACK_STRUCT_FIELD(u8_t hlen);
+ PACK_STRUCT_FIELD(u8_t hops);
+ PACK_STRUCT_FIELD(u32_t xid);
+ PACK_STRUCT_FIELD(u16_t secs);
+ PACK_STRUCT_FIELD(u16_t flags);
+ PACK_STRUCT_FIELD(ip_addr_p_t ciaddr);
+ PACK_STRUCT_FIELD(ip_addr_p_t yiaddr);
+ PACK_STRUCT_FIELD(ip_addr_p_t siaddr);
+ PACK_STRUCT_FIELD(ip_addr_p_t giaddr);
+ PACK_STRUCT_FIELD(u8_t chaddr[DHCP_CHADDR_LEN]);
+ PACK_STRUCT_FIELD(u8_t sname[DHCP_SNAME_LEN]);
+ PACK_STRUCT_FIELD(u8_t file[DHCP_FILE_LEN]);
+ PACK_STRUCT_FIELD(u32_t cookie);
+#define DHCP_MIN_OPTIONS_LEN 68U
+/** make sure user does not configure this too small */
+#if ((defined(DHCP_OPTIONS_LEN)) && (DHCP_OPTIONS_LEN < DHCP_MIN_OPTIONS_LEN))
+# undef DHCP_OPTIONS_LEN
+#endif
+/** allow this to be configured in lwipopts.h, but not too small */
+#if (!defined(DHCP_OPTIONS_LEN))
+/** set this to be sufficient for your options in outgoing DHCP msgs */
+# define DHCP_OPTIONS_LEN DHCP_MIN_OPTIONS_LEN
+#endif
+ PACK_STRUCT_FIELD(u8_t options[DHCP_OPTIONS_LEN]);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+
+void dhcp_set_struct(struct netif *netif, struct dhcp *dhcp);
+/** Remove a struct dhcp previously set to the netif using dhcp_set_struct() */
+#define dhcp_remove_struct(netif) do { (netif)->dhcp = NULL; } while(0)
+void dhcp_cleanup(struct netif *netif);
+/** start DHCP configuration */
+err_t dhcp_start(struct netif *netif);
+/** enforce early lease renewal (not needed normally)*/
+err_t dhcp_renew(struct netif *netif);
+/** release the DHCP lease, usually called before dhcp_stop()*/
+err_t dhcp_release(struct netif *netif);
+/** stop DHCP configuration */
+void dhcp_stop(struct netif *netif);
+/** inform server of our manual IP address */
+void dhcp_inform(struct netif *netif);
+/** Handle a possible change in the network configuration */
+void dhcp_network_changed(struct netif *netif);
+
+/** if enabled, check whether the offered IP address is not in use, using ARP */
+#if DHCP_DOES_ARP_CHECK
+void dhcp_arp_reply(struct netif *netif, ip_addr_t *addr);
+#endif
+
+/** to be called every minute */
+void dhcp_coarse_tmr(void);
+/** to be called every half second */
+void dhcp_fine_tmr(void);
+
+/** DHCP message item offsets and length */
+#define DHCP_OP_OFS 0
+#define DHCP_HTYPE_OFS 1
+#define DHCP_HLEN_OFS 2
+#define DHCP_HOPS_OFS 3
+#define DHCP_XID_OFS 4
+#define DHCP_SECS_OFS 8
+#define DHCP_FLAGS_OFS 10
+#define DHCP_CIADDR_OFS 12
+#define DHCP_YIADDR_OFS 16
+#define DHCP_SIADDR_OFS 20
+#define DHCP_GIADDR_OFS 24
+#define DHCP_CHADDR_OFS 28
+#define DHCP_SNAME_OFS 44
+#define DHCP_FILE_OFS 108
+#define DHCP_MSG_LEN 236
+
+#define DHCP_COOKIE_OFS DHCP_MSG_LEN
+#define DHCP_OPTIONS_OFS (DHCP_MSG_LEN + 4)
+
+#define DHCP_CLIENT_PORT 68
+#define DHCP_SERVER_PORT 67
+
+/** DHCP client states */
+#define DHCP_OFF 0
+#define DHCP_REQUESTING 1
+#define DHCP_INIT 2
+#define DHCP_REBOOTING 3
+#define DHCP_REBINDING 4
+#define DHCP_RENEWING 5
+#define DHCP_SELECTING 6
+#define DHCP_INFORMING 7
+#define DHCP_CHECKING 8
+#define DHCP_PERMANENT 9
+#define DHCP_BOUND 10
+/** not yet implemented #define DHCP_RELEASING 11 */
+#define DHCP_BACKING_OFF 12
+
+/** AUTOIP cooperatation flags */
+#define DHCP_AUTOIP_COOP_STATE_OFF 0
+#define DHCP_AUTOIP_COOP_STATE_ON 1
+
+#define DHCP_BOOTREQUEST 1
+#define DHCP_BOOTREPLY 2
+
+/** DHCP message types */
+#define DHCP_DISCOVER 1
+#define DHCP_OFFER 2
+#define DHCP_REQUEST 3
+#define DHCP_DECLINE 4
+#define DHCP_ACK 5
+#define DHCP_NAK 6
+#define DHCP_RELEASE 7
+#define DHCP_INFORM 8
+
+/** DHCP hardware type, currently only ethernet is supported */
+#define DHCP_HTYPE_ETH 1
+
+#define DHCP_MAGIC_COOKIE 0x63825363UL
+
+/* This is a list of options for BOOTP and DHCP, see RFC 2132 for descriptions */
+
+/** BootP options */
+#define DHCP_OPTION_PAD 0
+#define DHCP_OPTION_SUBNET_MASK 1 /* RFC 2132 3.3 */
+#define DHCP_OPTION_ROUTER 3
+#define DHCP_OPTION_DNS_SERVER 6
+#define DHCP_OPTION_HOSTNAME 12
+#define DHCP_OPTION_IP_TTL 23
+#define DHCP_OPTION_MTU 26
+#define DHCP_OPTION_BROADCAST 28
+#define DHCP_OPTION_TCP_TTL 37
+#define DHCP_OPTION_END 255
+
+/** DHCP options */
+#define DHCP_OPTION_REQUESTED_IP 50 /* RFC 2132 9.1, requested IP address */
+#define DHCP_OPTION_LEASE_TIME 51 /* RFC 2132 9.2, time in seconds, in 4 bytes */
+#define DHCP_OPTION_OVERLOAD 52 /* RFC2132 9.3, use file and/or sname field for options */
+
+#define DHCP_OPTION_MESSAGE_TYPE 53 /* RFC 2132 9.6, important for DHCP */
+#define DHCP_OPTION_MESSAGE_TYPE_LEN 1
+
+#define DHCP_OPTION_SERVER_ID 54 /* RFC 2132 9.7, server IP address */
+#define DHCP_OPTION_PARAMETER_REQUEST_LIST 55 /* RFC 2132 9.8, requested option types */
+
+#define DHCP_OPTION_MAX_MSG_SIZE 57 /* RFC 2132 9.10, message size accepted >= 576 */
+#define DHCP_OPTION_MAX_MSG_SIZE_LEN 2
+
+#define DHCP_OPTION_T1 58 /* T1 renewal time */
+#define DHCP_OPTION_T2 59 /* T2 rebinding time */
+#define DHCP_OPTION_US 60
+#define DHCP_OPTION_CLIENT_ID 61
+#define DHCP_OPTION_TFTP_SERVERNAME 66
+#define DHCP_OPTION_BOOTFILE 67
+
+/** possible combinations of overloading the file and sname fields with options */
+#define DHCP_OVERLOAD_NONE 0
+#define DHCP_OVERLOAD_FILE 1
+#define DHCP_OVERLOAD_SNAME 2
+#define DHCP_OVERLOAD_SNAME_FILE 3
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_DHCP */
+
+#endif /*__LWIP_DHCP_H__*/
--- /dev/null
+/**
+ * lwip DNS resolver header file.
+
+ * Author: Jim Pettinato
+ * April 2007
+
+ * ported from uIP resolv.c Copyright (c) 2002-2003, Adam Dunkels.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ * products derived from this software without specific prior
+ * written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __LWIP_DNS_H__
+#define __LWIP_DNS_H__
+
+#include "lwip/opt.h"
+
+#if LWIP_DNS /* don't build if not configured for use in lwipopts.h */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** DNS timer period */
+#define DNS_TMR_INTERVAL 1000
+
+/** DNS field TYPE used for "Resource Records" */
+#define DNS_RRTYPE_A 1 /* a host address */
+#define DNS_RRTYPE_NS 2 /* an authoritative name server */
+#define DNS_RRTYPE_MD 3 /* a mail destination (Obsolete - use MX) */
+#define DNS_RRTYPE_MF 4 /* a mail forwarder (Obsolete - use MX) */
+#define DNS_RRTYPE_CNAME 5 /* the canonical name for an alias */
+#define DNS_RRTYPE_SOA 6 /* marks the start of a zone of authority */
+#define DNS_RRTYPE_MB 7 /* a mailbox domain name (EXPERIMENTAL) */
+#define DNS_RRTYPE_MG 8 /* a mail group member (EXPERIMENTAL) */
+#define DNS_RRTYPE_MR 9 /* a mail rename domain name (EXPERIMENTAL) */
+#define DNS_RRTYPE_NULL 10 /* a null RR (EXPERIMENTAL) */
+#define DNS_RRTYPE_WKS 11 /* a well known service description */
+#define DNS_RRTYPE_PTR 12 /* a domain name pointer */
+#define DNS_RRTYPE_HINFO 13 /* host information */
+#define DNS_RRTYPE_MINFO 14 /* mailbox or mail list information */
+#define DNS_RRTYPE_MX 15 /* mail exchange */
+#define DNS_RRTYPE_TXT 16 /* text strings */
+
+/** DNS field CLASS used for "Resource Records" */
+#define DNS_RRCLASS_IN 1 /* the Internet */
+#define DNS_RRCLASS_CS 2 /* the CSNET class (Obsolete - used only for examples in some obsolete RFCs) */
+#define DNS_RRCLASS_CH 3 /* the CHAOS class */
+#define DNS_RRCLASS_HS 4 /* Hesiod [Dyer 87] */
+#define DNS_RRCLASS_FLUSH 0x800 /* Flush bit */
+
+/* The size used for the next line is rather a hack, but it prevents including socket.h in all files
+ that include memp.h, and that would possibly break portability (since socket.h defines some types
+ and constants possibly already define by the OS).
+ Calculation rule:
+ sizeof(struct addrinfo) + sizeof(struct sockaddr_in) + DNS_MAX_NAME_LENGTH + 1 byte zero-termination */
+#define NETDB_ELEM_SIZE (32 + 16 + DNS_MAX_NAME_LENGTH + 1)
+
+#if DNS_LOCAL_HOSTLIST
+/** struct used for local host-list */
+struct local_hostlist_entry {
+ /** static hostname */
+ const char *name;
+ /** static host address in network byteorder */
+ ip_addr_t addr;
+ struct local_hostlist_entry *next;
+};
+#if DNS_LOCAL_HOSTLIST_IS_DYNAMIC
+#ifndef DNS_LOCAL_HOSTLIST_MAX_NAMELEN
+#define DNS_LOCAL_HOSTLIST_MAX_NAMELEN DNS_MAX_NAME_LENGTH
+#endif
+#define LOCALHOSTLIST_ELEM_SIZE ((sizeof(struct local_hostlist_entry) + DNS_LOCAL_HOSTLIST_MAX_NAMELEN + 1))
+#endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
+#endif /* DNS_LOCAL_HOSTLIST */
+
+/** Callback which is invoked when a hostname is found.
+ * A function of this type must be implemented by the application using the DNS resolver.
+ * @param name pointer to the name that was looked up.
+ * @param ipaddr pointer to an ip_addr_t containing the IP address of the hostname,
+ * or NULL if the name could not be found (or on any other error).
+ * @param callback_arg a user-specified callback argument passed to dns_gethostbyname
+*/
+typedef void (*dns_found_callback)(const char *name, ip_addr_t *ipaddr, void *callback_arg);
+
+void dns_init(void);
+void dns_tmr(void);
+void dns_setserver(u8_t numdns, ip_addr_t *dnsserver);
+ip_addr_t dns_getserver(u8_t numdns);
+err_t dns_gethostbyname(const char *hostname, ip_addr_t *addr,
+ dns_found_callback found, void *callback_arg);
+
+#if DNS_LOCAL_HOSTLIST && DNS_LOCAL_HOSTLIST_IS_DYNAMIC
+int dns_local_removehost(const char *hostname, const ip_addr_t *addr);
+err_t dns_local_addhost(const char *hostname, const ip_addr_t *addr);
+#endif /* DNS_LOCAL_HOSTLIST && DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_DNS */
+
+#endif /* __LWIP_DNS_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_ERR_H__
+#define __LWIP_ERR_H__
+
+#include "lwip/opt.h"
+#include "lwip/arch.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Define LWIP_ERR_T in cc.h if you want to use
+ * a different type for your platform (must be signed). */
+#ifdef LWIP_ERR_T
+typedef LWIP_ERR_T err_t;
+#else /* LWIP_ERR_T */
+typedef s8_t err_t;
+#endif /* LWIP_ERR_T*/
+
+/* Definitions for error constants. */
+
+#define ERR_OK 0 /* No error, everything OK. */
+#define ERR_MEM -1 /* Out of memory error. */
+#define ERR_BUF -2 /* Buffer error. */
+#define ERR_TIMEOUT -3 /* Timeout. */
+#define ERR_RTE -4 /* Routing problem. */
+#define ERR_INPROGRESS -5 /* Operation in progress */
+#define ERR_VAL -6 /* Illegal value. */
+#define ERR_WOULDBLOCK -7 /* Operation would block. */
+#define ERR_USE -8 /* Address in use. */
+#define ERR_ISCONN -9 /* Already connected. */
+
+#define ERR_IS_FATAL(e) ((e) < ERR_ISCONN)
+
+#define ERR_ABRT -10 /* Connection aborted. */
+#define ERR_RST -11 /* Connection reset. */
+#define ERR_CLSD -12 /* Connection closed. */
+#define ERR_CONN -13 /* Not connected. */
+
+#define ERR_ARG -14 /* Illegal argument. */
+
+#define ERR_IF -15 /* Low-level netif error */
+
+
+#ifdef LWIP_DEBUG
+extern const char *lwip_strerr(err_t err);
+#else
+#define lwip_strerr(x) ""
+#endif /* LWIP_DEBUG */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LWIP_ERR_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_INIT_H__
+#define __LWIP_INIT_H__
+
+#include "lwip/opt.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** X.x.x: Major version of the stack */
+#define LWIP_VERSION_MAJOR 1U
+/** x.X.x: Minor version of the stack */
+#define LWIP_VERSION_MINOR 4U
+/** x.x.X: Revision of the stack */
+#define LWIP_VERSION_REVISION 0U
+/** For release candidates, this is set to 1..254
+ * For official releases, this is set to 255 (LWIP_RC_RELEASE)
+ * For development versions (CVS), this is set to 0 (LWIP_RC_DEVELOPMENT) */
+#define LWIP_VERSION_RC 255U
+
+/** LWIP_VERSION_RC is set to LWIP_RC_RELEASE for official releases */
+#define LWIP_RC_RELEASE 255U
+/** LWIP_VERSION_RC is set to LWIP_RC_DEVELOPMENT for CVS versions */
+#define LWIP_RC_DEVELOPMENT 0U
+
+#define LWIP_VERSION_IS_RELEASE (LWIP_VERSION_RC == LWIP_RC_RELEASE)
+#define LWIP_VERSION_IS_DEVELOPMENT (LWIP_VERSION_RC == LWIP_RC_DEVELOPMENT)
+#define LWIP_VERSION_IS_RC ((LWIP_VERSION_RC != LWIP_RC_RELEASE) && (LWIP_VERSION_RC != LWIP_RC_DEVELOPMENT))
+
+/** Provides the version of the stack */
+#define LWIP_VERSION (LWIP_VERSION_MAJOR << 24 | LWIP_VERSION_MINOR << 16 | \
+ LWIP_VERSION_REVISION << 8 | LWIP_VERSION_RC)
+
+/* Modules initialization */
+void lwip_init(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LWIP_INIT_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_MEM_H__
+#define __LWIP_MEM_H__
+
+#include "lwip/opt.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if MEM_LIBC_MALLOC
+
+#include <stddef.h> /* for size_t */
+
+typedef size_t mem_size_t;
+
+/* aliases for C library malloc() */
+#define mem_init()
+/* in case C library malloc() needs extra protection,
+ * allow these defines to be overridden.
+ */
+#ifndef mem_free
+#define mem_free free
+#endif
+#ifndef mem_malloc
+#define mem_malloc malloc
+#endif
+#ifndef mem_calloc
+#define mem_calloc calloc
+#endif
+/* Since there is no C library allocation function to shrink memory without
+ moving it, define this to nothing. */
+#ifndef mem_trim
+#define mem_trim(mem, size) (mem)
+#endif
+#else /* MEM_LIBC_MALLOC */
+
+/* MEM_SIZE would have to be aligned, but using 64000 here instead of
+ * 65535 leaves some room for alignment...
+ */
+#if MEM_SIZE > 64000L
+typedef u32_t mem_size_t;
+#define MEM_SIZE_F U32_F
+#else
+typedef u16_t mem_size_t;
+#define MEM_SIZE_F U16_F
+#endif /* MEM_SIZE > 64000 */
+
+#if MEM_USE_POOLS
+/** mem_init is not used when using pools instead of a heap */
+#define mem_init()
+/** mem_trim is not used when using pools instead of a heap:
+ we can't free part of a pool element and don't want to copy the rest */
+#define mem_trim(mem, size) (mem)
+#else /* MEM_USE_POOLS */
+/* lwIP alternative malloc */
+void mem_init(void);
+void *mem_trim(void *mem, mem_size_t size);
+#endif /* MEM_USE_POOLS */
+void *mem_malloc(mem_size_t size);
+void *mem_calloc(mem_size_t count, mem_size_t size);
+void mem_free(void *mem);
+#endif /* MEM_LIBC_MALLOC */
+
+/** Calculate memory size for an aligned buffer - returns the next highest
+ * multiple of MEM_ALIGNMENT (e.g. LWIP_MEM_ALIGN_SIZE(3) and
+ * LWIP_MEM_ALIGN_SIZE(4) will both yield 4 for MEM_ALIGNMENT == 4).
+ */
+#ifndef LWIP_MEM_ALIGN_SIZE
+#define LWIP_MEM_ALIGN_SIZE(size) (((size) + MEM_ALIGNMENT - 1) & ~(MEM_ALIGNMENT-1))
+#endif
+
+/** Calculate safe memory size for an aligned buffer when using an unaligned
+ * type as storage. This includes a safety-margin on (MEM_ALIGNMENT - 1) at the
+ * start (e.g. if buffer is u8_t[] and actual data will be u32_t*)
+ */
+#ifndef LWIP_MEM_ALIGN_BUFFER
+#define LWIP_MEM_ALIGN_BUFFER(size) (((size) + MEM_ALIGNMENT - 1))
+#endif
+
+/** Align a memory pointer to the alignment defined by MEM_ALIGNMENT
+ * so that ADDR % MEM_ALIGNMENT == 0
+ */
+#ifndef LWIP_MEM_ALIGN
+#define LWIP_MEM_ALIGN(addr) ((void *)(((mem_ptr_t)(addr) + MEM_ALIGNMENT - 1) & ~(mem_ptr_t)(MEM_ALIGNMENT-1)))
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LWIP_MEM_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#ifndef __LWIP_MEMP_H__
+#define __LWIP_MEMP_H__
+
+#include "lwip/opt.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Create the list of all memory pools managed by memp. MEMP_MAX represents a NULL pool at the end */
+typedef enum {
+#define LWIP_MEMPOOL(name,num,size,desc) MEMP_##name,
+#include "lwip/memp_std.h"
+ MEMP_MAX
+} memp_t;
+
+#if MEM_USE_POOLS
+/* Use a helper type to get the start and end of the user "memory pools" for mem_malloc */
+typedef enum {
+ /* Get the first (via:
+ MEMP_POOL_HELPER_START = ((u8_t) 1*MEMP_POOL_A + 0*MEMP_POOL_B + 0*MEMP_POOL_C + 0)*/
+ MEMP_POOL_HELPER_FIRST = ((u8_t)
+#define LWIP_MEMPOOL(name,num,size,desc)
+#define LWIP_MALLOC_MEMPOOL_START 1
+#define LWIP_MALLOC_MEMPOOL(num, size) * MEMP_POOL_##size + 0
+#define LWIP_MALLOC_MEMPOOL_END
+#include "lwip/memp_std.h"
+ ) ,
+ /* Get the last (via:
+ MEMP_POOL_HELPER_END = ((u8_t) 0 + MEMP_POOL_A*0 + MEMP_POOL_B*0 + MEMP_POOL_C*1) */
+ MEMP_POOL_HELPER_LAST = ((u8_t)
+#define LWIP_MEMPOOL(name,num,size,desc)
+#define LWIP_MALLOC_MEMPOOL_START
+#define LWIP_MALLOC_MEMPOOL(num, size) 0 + MEMP_POOL_##size *
+#define LWIP_MALLOC_MEMPOOL_END 1
+#include "lwip/memp_std.h"
+ )
+} memp_pool_helper_t;
+
+/* The actual start and stop values are here (cast them over)
+ We use this helper type and these defines so we can avoid using const memp_t values */
+#define MEMP_POOL_FIRST ((memp_t) MEMP_POOL_HELPER_FIRST)
+#define MEMP_POOL_LAST ((memp_t) MEMP_POOL_HELPER_LAST)
+#endif /* MEM_USE_POOLS */
+
+#if MEMP_MEM_MALLOC || MEM_USE_POOLS
+extern const u16_t memp_sizes[MEMP_MAX];
+#endif /* MEMP_MEM_MALLOC || MEM_USE_POOLS */
+
+#if MEMP_MEM_MALLOC
+
+#include "mem.h"
+
+#define memp_init()
+#define memp_malloc(type) mem_malloc(memp_sizes[type])
+#define memp_free(type, mem) mem_free(mem)
+
+#else /* MEMP_MEM_MALLOC */
+
+#if MEM_USE_POOLS
+/** This structure is used to save the pool one element came from. */
+struct memp_malloc_helper
+{
+ memp_t poolnr;
+};
+#endif /* MEM_USE_POOLS */
+
+void memp_init(void);
+
+#if MEMP_OVERFLOW_CHECK
+void *memp_malloc_fn(memp_t type, const char* file, const int line);
+#define memp_malloc(t) memp_malloc_fn((t), __FILE__, __LINE__)
+#else
+void *memp_malloc(memp_t type);
+#endif
+void memp_free(memp_t type, void *mem);
+
+#endif /* MEMP_MEM_MALLOC */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LWIP_MEMP_H__ */
--- /dev/null
+/*
+ * SETUP: Make sure we define everything we will need.
+ *
+ * We have create three types of pools:
+ * 1) MEMPOOL - standard pools
+ * 2) MALLOC_MEMPOOL - to be used by mem_malloc in mem.c
+ * 3) PBUF_MEMPOOL - a mempool of pbuf's, so include space for the pbuf struct
+ *
+ * If the include'r doesn't require any special treatment of each of the types
+ * above, then will declare #2 & #3 to be just standard mempools.
+ */
+#ifndef LWIP_MALLOC_MEMPOOL
+/* This treats "malloc pools" just like any other pool.
+ The pools are a little bigger to provide 'size' as the amount of user data. */
+#define LWIP_MALLOC_MEMPOOL(num, size) LWIP_MEMPOOL(POOL_##size, num, (size + sizeof(struct memp_malloc_helper)), "MALLOC_"#size)
+#define LWIP_MALLOC_MEMPOOL_START
+#define LWIP_MALLOC_MEMPOOL_END
+#endif /* LWIP_MALLOC_MEMPOOL */
+
+#ifndef LWIP_PBUF_MEMPOOL
+/* This treats "pbuf pools" just like any other pool.
+ * Allocates buffers for a pbuf struct AND a payload size */
+#define LWIP_PBUF_MEMPOOL(name, num, payload, desc) LWIP_MEMPOOL(name, num, (MEMP_ALIGN_SIZE(sizeof(struct pbuf)) + MEMP_ALIGN_SIZE(payload)), desc)
+#endif /* LWIP_PBUF_MEMPOOL */
+
+
+/*
+ * A list of internal pools used by LWIP.
+ *
+ * LWIP_MEMPOOL(pool_name, number_elements, element_size, pool_description)
+ * creates a pool name MEMP_pool_name. description is used in stats.c
+ */
+#if LWIP_RAW
+LWIP_MEMPOOL(RAW_PCB, MEMP_NUM_RAW_PCB, sizeof(struct raw_pcb), "RAW_PCB")
+#endif /* LWIP_RAW */
+
+#if LWIP_UDP
+LWIP_MEMPOOL(UDP_PCB, MEMP_NUM_UDP_PCB, sizeof(struct udp_pcb), "UDP_PCB")
+#endif /* LWIP_UDP */
+
+#if LWIP_TCP
+LWIP_MEMPOOL(TCP_PCB, MEMP_NUM_TCP_PCB, sizeof(struct tcp_pcb), "TCP_PCB")
+LWIP_MEMPOOL(TCP_PCB_LISTEN, MEMP_NUM_TCP_PCB_LISTEN, sizeof(struct tcp_pcb_listen), "TCP_PCB_LISTEN")
+LWIP_MEMPOOL(TCP_SEG, MEMP_NUM_TCP_SEG, sizeof(struct tcp_seg), "TCP_SEG")
+#endif /* LWIP_TCP */
+
+#if IP_REASSEMBLY
+LWIP_MEMPOOL(REASSDATA, MEMP_NUM_REASSDATA, sizeof(struct ip_reassdata), "REASSDATA")
+#endif /* IP_REASSEMBLY */
+#if IP_FRAG && !IP_FRAG_USES_STATIC_BUF && !LWIP_NETIF_TX_SINGLE_PBUF
+LWIP_MEMPOOL(FRAG_PBUF, MEMP_NUM_FRAG_PBUF, sizeof(struct pbuf_custom_ref),"FRAG_PBUF")
+#endif /* IP_FRAG && !IP_FRAG_USES_STATIC_BUF && !LWIP_NETIF_TX_SINGLE_PBUF */
+
+#if LWIP_NETCONN
+LWIP_MEMPOOL(NETBUF, MEMP_NUM_NETBUF, sizeof(struct netbuf), "NETBUF")
+LWIP_MEMPOOL(NETCONN, MEMP_NUM_NETCONN, sizeof(struct netconn), "NETCONN")
+#endif /* LWIP_NETCONN */
+
+#if NO_SYS==0
+LWIP_MEMPOOL(TCPIP_MSG_API, MEMP_NUM_TCPIP_MSG_API, sizeof(struct tcpip_msg), "TCPIP_MSG_API")
+#if !LWIP_TCPIP_CORE_LOCKING_INPUT
+LWIP_MEMPOOL(TCPIP_MSG_INPKT,MEMP_NUM_TCPIP_MSG_INPKT, sizeof(struct tcpip_msg), "TCPIP_MSG_INPKT")
+#endif /* !LWIP_TCPIP_CORE_LOCKING_INPUT */
+#endif /* NO_SYS==0 */
+
+#if ARP_QUEUEING
+LWIP_MEMPOOL(ARP_QUEUE, MEMP_NUM_ARP_QUEUE, sizeof(struct etharp_q_entry), "ARP_QUEUE")
+#endif /* ARP_QUEUEING */
+
+#if LWIP_IGMP
+LWIP_MEMPOOL(IGMP_GROUP, MEMP_NUM_IGMP_GROUP, sizeof(struct igmp_group), "IGMP_GROUP")
+#endif /* LWIP_IGMP */
+
+#if (!NO_SYS || (NO_SYS && !NO_SYS_NO_TIMERS)) /* LWIP_TIMERS */
+LWIP_MEMPOOL(SYS_TIMEOUT, MEMP_NUM_SYS_TIMEOUT, sizeof(struct sys_timeo), "SYS_TIMEOUT")
+#endif /* LWIP_TIMERS */
+
+#if LWIP_SNMP
+LWIP_MEMPOOL(SNMP_ROOTNODE, MEMP_NUM_SNMP_ROOTNODE, sizeof(struct mib_list_rootnode), "SNMP_ROOTNODE")
+LWIP_MEMPOOL(SNMP_NODE, MEMP_NUM_SNMP_NODE, sizeof(struct mib_list_node), "SNMP_NODE")
+LWIP_MEMPOOL(SNMP_VARBIND, MEMP_NUM_SNMP_VARBIND, sizeof(struct snmp_varbind), "SNMP_VARBIND")
+LWIP_MEMPOOL(SNMP_VALUE, MEMP_NUM_SNMP_VALUE, SNMP_MAX_VALUE_SIZE, "SNMP_VALUE")
+#endif /* LWIP_SNMP */
+#if LWIP_DNS && LWIP_SOCKET
+LWIP_MEMPOOL(NETDB, MEMP_NUM_NETDB, NETDB_ELEM_SIZE, "NETDB")
+#endif /* LWIP_DNS && LWIP_SOCKET */
+#if LWIP_DNS && DNS_LOCAL_HOSTLIST && DNS_LOCAL_HOSTLIST_IS_DYNAMIC
+LWIP_MEMPOOL(LOCALHOSTLIST, MEMP_NUM_LOCALHOSTLIST, LOCALHOSTLIST_ELEM_SIZE, "LOCALHOSTLIST")
+#endif /* LWIP_DNS && DNS_LOCAL_HOSTLIST && DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
+#if PPP_SUPPORT && PPPOE_SUPPORT
+LWIP_MEMPOOL(PPPOE_IF, MEMP_NUM_PPPOE_INTERFACES, sizeof(struct pppoe_softc), "PPPOE_IF")
+#endif /* PPP_SUPPORT && PPPOE_SUPPORT */
+
+/*
+ * A list of pools of pbuf's used by LWIP.
+ *
+ * LWIP_PBUF_MEMPOOL(pool_name, number_elements, pbuf_payload_size, pool_description)
+ * creates a pool name MEMP_pool_name. description is used in stats.c
+ * This allocates enough space for the pbuf struct and a payload.
+ * (Example: pbuf_payload_size=0 allocates only size for the struct)
+ */
+LWIP_PBUF_MEMPOOL(PBUF, MEMP_NUM_PBUF, 0, "PBUF_REF/ROM")
+LWIP_PBUF_MEMPOOL(PBUF_POOL, PBUF_POOL_SIZE, PBUF_POOL_BUFSIZE, "PBUF_POOL")
+
+
+/*
+ * Allow for user-defined pools; this must be explicitly set in lwipopts.h
+ * since the default is to NOT look for lwippools.h
+ */
+#if MEMP_USE_CUSTOM_POOLS
+#include "lwippools.h"
+#endif /* MEMP_USE_CUSTOM_POOLS */
+
+/*
+ * REQUIRED CLEANUP: Clear up so we don't get "multiply defined" error later
+ * (#undef is ignored for something that is not defined)
+ */
+#undef LWIP_MEMPOOL
+#undef LWIP_MALLOC_MEMPOOL
+#undef LWIP_MALLOC_MEMPOOL_START
+#undef LWIP_MALLOC_MEMPOOL_END
+#undef LWIP_PBUF_MEMPOOL
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_NETBUF_H__
+#define __LWIP_NETBUF_H__
+
+#include "lwip/opt.h"
+#include "lwip/pbuf.h"
+#include "lwip/ip_addr.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** This netbuf has dest-addr/port set */
+#define NETBUF_FLAG_DESTADDR 0x01
+/** This netbuf includes a checksum */
+#define NETBUF_FLAG_CHKSUM 0x02
+
+struct netbuf {
+ struct pbuf *p, *ptr;
+ ip_addr_t addr;
+ u16_t port;
+#if LWIP_NETBUF_RECVINFO || LWIP_CHECKSUM_ON_COPY
+#if LWIP_CHECKSUM_ON_COPY
+ u8_t flags;
+#endif /* LWIP_CHECKSUM_ON_COPY */
+ u16_t toport_chksum;
+#if LWIP_NETBUF_RECVINFO
+ ip_addr_t toaddr;
+#endif /* LWIP_NETBUF_RECVINFO */
+#endif /* LWIP_NETBUF_RECVINFO || LWIP_CHECKSUM_ON_COPY */
+};
+
+/* Network buffer functions: */
+struct netbuf * netbuf_new (void);
+void netbuf_delete (struct netbuf *buf);
+void * netbuf_alloc (struct netbuf *buf, u16_t size);
+void netbuf_free (struct netbuf *buf);
+err_t netbuf_ref (struct netbuf *buf,
+ const void *dataptr, u16_t size);
+void netbuf_chain (struct netbuf *head,
+ struct netbuf *tail);
+
+err_t netbuf_data (struct netbuf *buf,
+ void **dataptr, u16_t *len);
+s8_t netbuf_next (struct netbuf *buf);
+void netbuf_first (struct netbuf *buf);
+
+
+#define netbuf_copy_partial(buf, dataptr, len, offset) \
+ pbuf_copy_partial((buf)->p, (dataptr), (len), (offset))
+#define netbuf_copy(buf,dataptr,len) netbuf_copy_partial(buf, dataptr, len, 0)
+#define netbuf_take(buf, dataptr, len) pbuf_take((buf)->p, dataptr, len)
+#define netbuf_len(buf) ((buf)->p->tot_len)
+#define netbuf_fromaddr(buf) (&((buf)->addr))
+#define netbuf_set_fromaddr(buf, fromaddr) ip_addr_set((&(buf)->addr), fromaddr)
+#define netbuf_fromport(buf) ((buf)->port)
+#if LWIP_NETBUF_RECVINFO
+#define netbuf_destaddr(buf) (&((buf)->toaddr))
+#define netbuf_set_destaddr(buf, destaddr) ip_addr_set((&(buf)->addr), destaddr)
+#define netbuf_destport(buf) (((buf)->flags & NETBUF_FLAG_DESTADDR) ? (buf)->toport_chksum : 0)
+#endif /* LWIP_NETBUF_RECVINFO */
+#if LWIP_CHECKSUM_ON_COPY
+#define netbuf_set_chksum(buf, chksum) do { (buf)->flags = NETBUF_FLAG_CHKSUM; \
+ (buf)->toport_chksum = chksum; } while(0)
+#endif /* LWIP_CHECKSUM_ON_COPY */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LWIP_NETBUF_H__ */
--- /dev/null
+/*
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Simon Goldschmidt
+ *
+ */
+#ifndef __LWIP_NETDB_H__
+#define __LWIP_NETDB_H__
+
+#include "lwip/opt.h"
+
+#if LWIP_DNS && LWIP_SOCKET
+
+#include <stddef.h> /* for size_t */
+
+#include "lwip/inet.h"
+#include "lwip/sockets.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* some rarely used options */
+#ifndef LWIP_DNS_API_DECLARE_H_ERRNO
+#define LWIP_DNS_API_DECLARE_H_ERRNO 1
+#endif
+
+#ifndef LWIP_DNS_API_DEFINE_ERRORS
+#define LWIP_DNS_API_DEFINE_ERRORS 1
+#endif
+
+#ifndef LWIP_DNS_API_DECLARE_STRUCTS
+#define LWIP_DNS_API_DECLARE_STRUCTS 1
+#endif
+
+#if LWIP_DNS_API_DEFINE_ERRORS
+/** Errors used by the DNS API functions, h_errno can be one of them */
+#define EAI_NONAME 200
+#define EAI_SERVICE 201
+#define EAI_FAIL 202
+#define EAI_MEMORY 203
+
+#define HOST_NOT_FOUND 210
+#define NO_DATA 211
+#define NO_RECOVERY 212
+#define TRY_AGAIN 213
+#endif /* LWIP_DNS_API_DEFINE_ERRORS */
+
+#if LWIP_DNS_API_DECLARE_STRUCTS
+struct hostent {
+ char *h_name; /* Official name of the host. */
+ char **h_aliases; /* A pointer to an array of pointers to alternative host names,
+ terminated by a null pointer. */
+ int h_addrtype; /* Address type. */
+ int h_length; /* The length, in bytes, of the address. */
+ char **h_addr_list; /* A pointer to an array of pointers to network addresses (in
+ network byte order) for the host, terminated by a null pointer. */
+#define h_addr h_addr_list[0] /* for backward compatibility */
+};
+
+struct addrinfo {
+ int ai_flags; /* Input flags. */
+ int ai_family; /* Address family of socket. */
+ int ai_socktype; /* Socket type. */
+ int ai_protocol; /* Protocol of socket. */
+ socklen_t ai_addrlen; /* Length of socket address. */
+ struct sockaddr *ai_addr; /* Socket address of socket. */
+ char *ai_canonname; /* Canonical name of service location. */
+ struct addrinfo *ai_next; /* Pointer to next in list. */
+};
+#endif /* LWIP_DNS_API_DECLARE_STRUCTS */
+
+#if LWIP_DNS_API_DECLARE_H_ERRNO
+/* application accessable error code set by the DNS API functions */
+extern int h_errno;
+#endif /* LWIP_DNS_API_DECLARE_H_ERRNO*/
+
+struct hostent *lwip_gethostbyname(const char *name);
+int lwip_gethostbyname_r(const char *name, struct hostent *ret, char *buf,
+ size_t buflen, struct hostent **result, int *h_errnop);
+void lwip_freeaddrinfo(struct addrinfo *ai);
+int lwip_getaddrinfo(const char *nodename,
+ const char *servname,
+ const struct addrinfo *hints,
+ struct addrinfo **res);
+
+#if LWIP_COMPAT_SOCKETS
+#define gethostbyname(name) lwip_gethostbyname(name)
+#define gethostbyname_r(name, ret, buf, buflen, result, h_errnop) \
+ lwip_gethostbyname_r(name, ret, buf, buflen, result, h_errnop)
+#define freeaddrinfo(addrinfo) lwip_freeaddrinfo(addrinfo)
+#define getaddrinfo(nodname, servname, hints, res) \
+ lwip_getaddrinfo(nodname, servname, hints, res)
+#endif /* LWIP_COMPAT_SOCKETS */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_DNS && LWIP_SOCKET */
+
+#endif /* __LWIP_NETDB_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_NETIF_H__
+#define __LWIP_NETIF_H__
+
+#include "lwip/opt.h"
+
+#define ENABLE_LOOPBACK (LWIP_NETIF_LOOPBACK || LWIP_HAVE_LOOPIF)
+
+#include "lwip/err.h"
+
+#include "lwip/ip_addr.h"
+
+#include "lwip/def.h"
+#include "lwip/pbuf.h"
+#if LWIP_DHCP
+struct dhcp;
+#endif
+#if LWIP_AUTOIP
+struct autoip;
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Throughout this file, IP addresses are expected to be in
+ * the same byte order as in IP_PCB. */
+
+/** must be the maximum of all used hardware address lengths
+ across all types of interfaces in use */
+#define NETIF_MAX_HWADDR_LEN 6U
+
+/** Whether the network interface is 'up'. This is
+ * a software flag used to control whether this network
+ * interface is enabled and processes traffic.
+ * It is set by the startup code (for static IP configuration) or
+ * by dhcp/autoip when an address has been assigned.
+ */
+#define NETIF_FLAG_UP 0x01U
+/** If set, the netif has broadcast capability.
+ * Set by the netif driver in its init function. */
+#define NETIF_FLAG_BROADCAST 0x02U
+/** If set, the netif is one end of a point-to-point connection.
+ * Set by the netif driver in its init function. */
+#define NETIF_FLAG_POINTTOPOINT 0x04U
+/** If set, the interface is configured using DHCP.
+ * Set by the DHCP code when starting or stopping DHCP. */
+#define NETIF_FLAG_DHCP 0x08U
+/** If set, the interface has an active link
+ * (set by the network interface driver).
+ * Either set by the netif driver in its init function (if the link
+ * is up at that time) or at a later point once the link comes up
+ * (if link detection is supported by the hardware). */
+#define NETIF_FLAG_LINK_UP 0x10U
+/** If set, the netif is an ethernet device using ARP.
+ * Set by the netif driver in its init function.
+ * Used to check input packet types and use of DHCP. */
+#define NETIF_FLAG_ETHARP 0x20U
+/** If set, the netif is an ethernet device. It might not use
+ * ARP or TCP/IP if it is used for PPPoE only.
+ */
+#define NETIF_FLAG_ETHERNET 0x40U
+/** If set, the netif has IGMP capability.
+ * Set by the netif driver in its init function. */
+#define NETIF_FLAG_IGMP 0x80U
+
+/** Function prototype for netif init functions. Set up flags and output/linkoutput
+ * callback functions in this function.
+ *
+ * @param netif The netif to initialize
+ */
+typedef err_t (*netif_init_fn)(struct netif *netif);
+/** Function prototype for netif->input functions. This function is saved as 'input'
+ * callback function in the netif struct. Call it when a packet has been received.
+ *
+ * @param p The received packet, copied into a pbuf
+ * @param inp The netif which received the packet
+ */
+typedef err_t (*netif_input_fn)(struct pbuf *p, struct netif *inp);
+/** Function prototype for netif->output functions. Called by lwIP when a packet
+ * shall be sent. For ethernet netif, set this to 'etharp_output' and set
+ * 'linkoutput'.
+ *
+ * @param netif The netif which shall send a packet
+ * @param p The packet to send (p->payload points to IP header)
+ * @param ipaddr The IP address to which the packet shall be sent
+ */
+typedef err_t (*netif_output_fn)(struct netif *netif, struct pbuf *p,
+ ip_addr_t *ipaddr);
+/** Function prototype for netif->linkoutput functions. Only used for ethernet
+ * netifs. This function is called by ARP when a packet shall be sent.
+ *
+ * @param netif The netif which shall send a packet
+ * @param p The packet to send (raw ethernet packet)
+ */
+typedef err_t (*netif_linkoutput_fn)(struct netif *netif, struct pbuf *p);
+/** Function prototype for netif status- or link-callback functions. */
+typedef void (*netif_status_callback_fn)(struct netif *netif);
+/** Function prototype for netif igmp_mac_filter functions */
+typedef err_t (*netif_igmp_mac_filter_fn)(struct netif *netif,
+ ip_addr_t *group, u8_t action);
+
+/** Generic data structure used for all lwIP network interfaces.
+ * The following fields should be filled in by the initialization
+ * function for the device driver: hwaddr_len, hwaddr[], mtu, flags */
+struct netif {
+ /** pointer to next in linked list */
+ struct netif *next;
+
+ /** IP address configuration in network byte order */
+ ip_addr_t ip_addr;
+ ip_addr_t netmask;
+ ip_addr_t gw;
+
+ /** This function is called by the network device driver
+ * to pass a packet up the TCP/IP stack. */
+ netif_input_fn input;
+ /** This function is called by the IP module when it wants
+ * to send a packet on the interface. This function typically
+ * first resolves the hardware address, then sends the packet. */
+ netif_output_fn output;
+ /** This function is called by the ARP module when it wants
+ * to send a packet on the interface. This function outputs
+ * the pbuf as-is on the link medium. */
+ netif_linkoutput_fn linkoutput;
+#if LWIP_NETIF_STATUS_CALLBACK
+ /** This function is called when the netif state is set to up or down
+ */
+ netif_status_callback_fn status_callback;
+#endif /* LWIP_NETIF_STATUS_CALLBACK */
+#if LWIP_NETIF_LINK_CALLBACK
+ /** This function is called when the netif link is set to up or down
+ */
+ netif_status_callback_fn link_callback;
+#endif /* LWIP_NETIF_LINK_CALLBACK */
+ /** This field can be set by the device driver and could point
+ * to state information for the device. */
+ void *state;
+#if LWIP_DHCP
+ /** the DHCP client state information for this netif */
+ struct dhcp *dhcp;
+#endif /* LWIP_DHCP */
+#if LWIP_AUTOIP
+ /** the AutoIP client state information for this netif */
+ struct autoip *autoip;
+#endif
+#if LWIP_NETIF_HOSTNAME
+ /* the hostname for this netif, NULL is a valid value */
+ char* hostname;
+#endif /* LWIP_NETIF_HOSTNAME */
+ /** maximum transfer unit (in bytes) */
+ u16_t mtu;
+ /** number of bytes used in hwaddr */
+ u8_t hwaddr_len;
+ /** link level hardware address of this interface */
+ u8_t hwaddr[NETIF_MAX_HWADDR_LEN];
+ /** flags (see NETIF_FLAG_ above) */
+ u8_t flags;
+ /** descriptive abbreviation */
+ char name[2];
+ /** number of this interface */
+ u8_t num;
+#if LWIP_SNMP
+ /** link type (from "snmp_ifType" enum from snmp.h) */
+ u8_t link_type;
+ /** (estimate) link speed */
+ u32_t link_speed;
+ /** timestamp at last change made (up/down) */
+ u32_t ts;
+ /** counters */
+ u32_t ifinoctets;
+ u32_t ifinucastpkts;
+ u32_t ifinnucastpkts;
+ u32_t ifindiscards;
+ u32_t ifoutoctets;
+ u32_t ifoutucastpkts;
+ u32_t ifoutnucastpkts;
+ u32_t ifoutdiscards;
+#endif /* LWIP_SNMP */
+#if LWIP_IGMP
+ /** This function could be called to add or delete a entry in the multicast
+ filter table of the ethernet MAC.*/
+ netif_igmp_mac_filter_fn igmp_mac_filter;
+#endif /* LWIP_IGMP */
+#if LWIP_NETIF_HWADDRHINT
+ u8_t *addr_hint;
+#endif /* LWIP_NETIF_HWADDRHINT */
+#if ENABLE_LOOPBACK
+ /* List of packets to be queued for ourselves. */
+ struct pbuf *loop_first;
+ struct pbuf *loop_last;
+#if LWIP_LOOPBACK_MAX_PBUFS
+ u16_t loop_cnt_current;
+#endif /* LWIP_LOOPBACK_MAX_PBUFS */
+#endif /* ENABLE_LOOPBACK */
+};
+
+#if LWIP_SNMP
+#define NETIF_INIT_SNMP(netif, type, speed) \
+ /* use "snmp_ifType" enum from snmp.h for "type", snmp_ifType_ethernet_csmacd by example */ \
+ (netif)->link_type = (type); \
+ /* your link speed here (units: bits per second) */ \
+ (netif)->link_speed = (speed); \
+ (netif)->ts = 0; \
+ (netif)->ifinoctets = 0; \
+ (netif)->ifinucastpkts = 0; \
+ (netif)->ifinnucastpkts = 0; \
+ (netif)->ifindiscards = 0; \
+ (netif)->ifoutoctets = 0; \
+ (netif)->ifoutucastpkts = 0; \
+ (netif)->ifoutnucastpkts = 0; \
+ (netif)->ifoutdiscards = 0
+#else /* LWIP_SNMP */
+#define NETIF_INIT_SNMP(netif, type, speed)
+#endif /* LWIP_SNMP */
+
+
+/** The list of network interfaces. */
+extern struct netif *netif_list;
+/** The default network interface. */
+extern struct netif *netif_default;
+
+void netif_init(void);
+
+struct netif *netif_add(struct netif *netif, ip_addr_t *ipaddr, ip_addr_t *netmask,
+ ip_addr_t *gw, void *state, netif_init_fn init, netif_input_fn input);
+
+void
+netif_set_addr(struct netif *netif, ip_addr_t *ipaddr, ip_addr_t *netmask,
+ ip_addr_t *gw);
+void netif_remove(struct netif * netif);
+
+/* Returns a network interface given its name. The name is of the form
+ "et0", where the first two letters are the "name" field in the
+ netif structure, and the digit is in the num field in the same
+ structure. */
+struct netif *netif_find(char *name);
+
+void netif_set_default(struct netif *netif);
+
+void netif_set_ipaddr(struct netif *netif, ip_addr_t *ipaddr);
+void netif_set_netmask(struct netif *netif, ip_addr_t *netmask);
+void netif_set_gw(struct netif *netif, ip_addr_t *gw);
+
+void netif_set_up(struct netif *netif);
+void netif_set_down(struct netif *netif);
+/** Ask if an interface is up */
+#define netif_is_up(netif) (((netif)->flags & NETIF_FLAG_UP) ? (u8_t)1 : (u8_t)0)
+
+#if LWIP_NETIF_STATUS_CALLBACK
+void netif_set_status_callback(struct netif *netif, netif_status_callback_fn status_callback);
+#endif /* LWIP_NETIF_STATUS_CALLBACK */
+
+void netif_set_link_up(struct netif *netif);
+void netif_set_link_down(struct netif *netif);
+/** Ask if a link is up */
+#define netif_is_link_up(netif) (((netif)->flags & NETIF_FLAG_LINK_UP) ? (u8_t)1 : (u8_t)0)
+
+#if LWIP_NETIF_LINK_CALLBACK
+void netif_set_link_callback(struct netif *netif, netif_status_callback_fn link_callback);
+#endif /* LWIP_NETIF_LINK_CALLBACK */
+
+#if LWIP_NETIF_HOSTNAME
+#define netif_set_hostname(netif, name) do { if((netif) != NULL) { (netif)->hostname = name; }}while(0)
+#define netif_get_hostname(netif) (((netif) != NULL) ? ((netif)->hostname) : NULL)
+#endif /* LWIP_NETIF_HOSTNAME */
+
+#if LWIP_IGMP
+#define netif_set_igmp_mac_filter(netif, function) do { if((netif) != NULL) { (netif)->igmp_mac_filter = function; }}while(0)
+#define netif_get_igmp_mac_filter(netif) (((netif) != NULL) ? ((netif)->igmp_mac_filter) : NULL)
+#endif /* LWIP_IGMP */
+
+#if ENABLE_LOOPBACK
+err_t netif_loop_output(struct netif *netif, struct pbuf *p, ip_addr_t *dest_ip);
+void netif_poll(struct netif *netif);
+#if !LWIP_NETIF_LOOPBACK_MULTITHREADING
+void netif_poll_all(void);
+#endif /* !LWIP_NETIF_LOOPBACK_MULTITHREADING */
+#endif /* ENABLE_LOOPBACK */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LWIP_NETIF_H__ */
--- /dev/null
+/*
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ */
+
+#ifndef __LWIP_NETIFAPI_H__
+#define __LWIP_NETIFAPI_H__
+
+#include "lwip/opt.h"
+
+#if LWIP_NETIF_API /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/sys.h"
+#include "lwip/netif.h"
+#include "lwip/dhcp.h"
+#include "lwip/autoip.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef void (*netifapi_void_fn)(struct netif *netif);
+typedef err_t (*netifapi_errt_fn)(struct netif *netif);
+
+struct netifapi_msg_msg {
+#if !LWIP_TCPIP_CORE_LOCKING
+ sys_sem_t sem;
+#endif /* !LWIP_TCPIP_CORE_LOCKING */
+ err_t err;
+ struct netif *netif;
+ union {
+ struct {
+ ip_addr_t *ipaddr;
+ ip_addr_t *netmask;
+ ip_addr_t *gw;
+ void *state;
+ netif_init_fn init;
+ netif_input_fn input;
+ } add;
+ struct {
+ netifapi_void_fn voidfunc;
+ netifapi_errt_fn errtfunc;
+ } common;
+ } msg;
+};
+
+struct netifapi_msg {
+ void (* function)(struct netifapi_msg_msg *msg);
+ struct netifapi_msg_msg msg;
+};
+
+
+/* API for application */
+err_t netifapi_netif_add ( struct netif *netif,
+ ip_addr_t *ipaddr,
+ ip_addr_t *netmask,
+ ip_addr_t *gw,
+ void *state,
+ netif_init_fn init,
+ netif_input_fn input);
+
+err_t netifapi_netif_set_addr ( struct netif *netif,
+ ip_addr_t *ipaddr,
+ ip_addr_t *netmask,
+ ip_addr_t *gw );
+
+err_t netifapi_netif_common ( struct netif *netif,
+ netifapi_void_fn voidfunc,
+ netifapi_errt_fn errtfunc);
+
+#define netifapi_netif_remove(n) netifapi_netif_common(n, netif_remove, NULL)
+#define netifapi_netif_set_up(n) netifapi_netif_common(n, netif_set_up, NULL)
+#define netifapi_netif_set_down(n) netifapi_netif_common(n, netif_set_down, NULL)
+#define netifapi_netif_set_default(n) netifapi_netif_common(n, netif_set_default, NULL)
+#define netifapi_dhcp_start(n) netifapi_netif_common(n, NULL, dhcp_start)
+#define netifapi_dhcp_stop(n) netifapi_netif_common(n, dhcp_stop, NULL)
+#define netifapi_autoip_start(n) netifapi_netif_common(n, NULL, autoip_start)
+#define netifapi_autoip_stop(n) netifapi_netif_common(n, NULL, autoip_stop)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_NETIF_API */
+
+#endif /* __LWIP_NETIFAPI_H__ */
--- /dev/null
+/**
+ * @file
+ *
+ * lwIP Options Configuration
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_OPT_H__
+#define __LWIP_OPT_H__
+
+/*
+ * Include user defined options first. Anything not defined in these files
+ * will be set to standard values. Override anything you dont like!
+ */
+#include "lwipopts.h"
+#include "lwip/debug.h"
+
+/*
+ -----------------------------------------------
+ ---------- Platform specific locking ----------
+ -----------------------------------------------
+*/
+
+/**
+ * SYS_LIGHTWEIGHT_PROT==1: if you want inter-task protection for certain
+ * critical regions during buffer allocation, deallocation and memory
+ * allocation and deallocation.
+ */
+#ifndef SYS_LIGHTWEIGHT_PROT
+#define SYS_LIGHTWEIGHT_PROT 0
+#endif
+
+/**
+ * NO_SYS==1: Provides VERY minimal functionality. Otherwise,
+ * use lwIP facilities.
+ */
+#ifndef NO_SYS
+#define NO_SYS 0
+#endif
+
+/**
+ * NO_SYS_NO_TIMERS==1: Drop support for sys_timeout when NO_SYS==1
+ * Mainly for compatibility to old versions.
+ */
+#ifndef NO_SYS_NO_TIMERS
+#define NO_SYS_NO_TIMERS 0
+#endif
+
+/**
+ * MEMCPY: override this if you have a faster implementation at hand than the
+ * one included in your C library
+ */
+#ifndef MEMCPY
+#define MEMCPY(dst,src,len) memcpy(dst,src,len)
+#endif
+
+/**
+ * SMEMCPY: override this with care! Some compilers (e.g. gcc) can inline a
+ * call to memcpy() if the length is known at compile time and is small.
+ */
+#ifndef SMEMCPY
+#define SMEMCPY(dst,src,len) memcpy(dst,src,len)
+#endif
+
+/*
+ ------------------------------------
+ ---------- Memory options ----------
+ ------------------------------------
+*/
+/**
+ * MEM_LIBC_MALLOC==1: Use malloc/free/realloc provided by your C-library
+ * instead of the lwip internal allocator. Can save code size if you
+ * already use it.
+ */
+#ifndef MEM_LIBC_MALLOC
+#define MEM_LIBC_MALLOC 0
+#endif
+
+/**
+* MEMP_MEM_MALLOC==1: Use mem_malloc/mem_free instead of the lwip pool allocator.
+* Especially useful with MEM_LIBC_MALLOC but handle with care regarding execution
+* speed and usage from interrupts!
+*/
+#ifndef MEMP_MEM_MALLOC
+#define MEMP_MEM_MALLOC 0
+#endif
+
+/**
+ * MEM_ALIGNMENT: should be set to the alignment of the CPU
+ * 4 byte alignment -> #define MEM_ALIGNMENT 4
+ * 2 byte alignment -> #define MEM_ALIGNMENT 2
+ */
+#ifndef MEM_ALIGNMENT
+#define MEM_ALIGNMENT 1
+#endif
+
+/**
+ * MEM_SIZE: the size of the heap memory. If the application will send
+ * a lot of data that needs to be copied, this should be set high.
+ */
+#ifndef MEM_SIZE
+#define MEM_SIZE 1600
+#endif
+
+/**
+ * MEMP_SEPARATE_POOLS: if defined to 1, each pool is placed in its own array.
+ * This can be used to individually change the location of each pool.
+ * Default is one big array for all pools
+ */
+#ifndef MEMP_SEPARATE_POOLS
+#define MEMP_SEPARATE_POOLS 0
+#endif
+
+/**
+ * MEMP_OVERFLOW_CHECK: memp overflow protection reserves a configurable
+ * amount of bytes before and after each memp element in every pool and fills
+ * it with a prominent default value.
+ * MEMP_OVERFLOW_CHECK == 0 no checking
+ * MEMP_OVERFLOW_CHECK == 1 checks each element when it is freed
+ * MEMP_OVERFLOW_CHECK >= 2 checks each element in every pool every time
+ * memp_malloc() or memp_free() is called (useful but slow!)
+ */
+#ifndef MEMP_OVERFLOW_CHECK
+#define MEMP_OVERFLOW_CHECK 0
+#endif
+
+/**
+ * MEMP_SANITY_CHECK==1: run a sanity check after each memp_free() to make
+ * sure that there are no cycles in the linked lists.
+ */
+#ifndef MEMP_SANITY_CHECK
+#define MEMP_SANITY_CHECK 0
+#endif
+
+/**
+ * MEM_USE_POOLS==1: Use an alternative to malloc() by allocating from a set
+ * of memory pools of various sizes. When mem_malloc is called, an element of
+ * the smallest pool that can provide the length needed is returned.
+ * To use this, MEMP_USE_CUSTOM_POOLS also has to be enabled.
+ */
+#ifndef MEM_USE_POOLS
+#define MEM_USE_POOLS 0
+#endif
+
+/**
+ * MEM_USE_POOLS_TRY_BIGGER_POOL==1: if one malloc-pool is empty, try the next
+ * bigger pool - WARNING: THIS MIGHT WASTE MEMORY but it can make a system more
+ * reliable. */
+#ifndef MEM_USE_POOLS_TRY_BIGGER_POOL
+#define MEM_USE_POOLS_TRY_BIGGER_POOL 0
+#endif
+
+/**
+ * MEMP_USE_CUSTOM_POOLS==1: whether to include a user file lwippools.h
+ * that defines additional pools beyond the "standard" ones required
+ * by lwIP. If you set this to 1, you must have lwippools.h in your
+ * inlude path somewhere.
+ */
+#ifndef MEMP_USE_CUSTOM_POOLS
+#define MEMP_USE_CUSTOM_POOLS 0
+#endif
+
+/**
+ * Set this to 1 if you want to free PBUF_RAM pbufs (or call mem_free()) from
+ * interrupt context (or another context that doesn't allow waiting for a
+ * semaphore).
+ * If set to 1, mem_malloc will be protected by a semaphore and SYS_ARCH_PROTECT,
+ * while mem_free will only use SYS_ARCH_PROTECT. mem_malloc SYS_ARCH_UNPROTECTs
+ * with each loop so that mem_free can run.
+ *
+ * ATTENTION: As you can see from the above description, this leads to dis-/
+ * enabling interrupts often, which can be slow! Also, on low memory, mem_malloc
+ * can need longer.
+ *
+ * If you don't want that, at least for NO_SYS=0, you can still use the following
+ * functions to enqueue a deallocation call which then runs in the tcpip_thread
+ * context:
+ * - pbuf_free_callback(p);
+ * - mem_free_callback(m);
+ */
+#ifndef LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT
+#define LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT 0
+#endif
+
+/*
+ ------------------------------------------------
+ ---------- Internal Memory Pool Sizes ----------
+ ------------------------------------------------
+*/
+/**
+ * MEMP_NUM_PBUF: the number of memp struct pbufs (used for PBUF_ROM and PBUF_REF).
+ * If the application sends a lot of data out of ROM (or other static memory),
+ * this should be set high.
+ */
+#ifndef MEMP_NUM_PBUF
+#define MEMP_NUM_PBUF 16
+#endif
+
+/**
+ * MEMP_NUM_RAW_PCB: Number of raw connection PCBs
+ * (requires the LWIP_RAW option)
+ */
+#ifndef MEMP_NUM_RAW_PCB
+#define MEMP_NUM_RAW_PCB 4
+#endif
+
+/**
+ * MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
+ * per active UDP "connection".
+ * (requires the LWIP_UDP option)
+ */
+#ifndef MEMP_NUM_UDP_PCB
+#define MEMP_NUM_UDP_PCB 4
+#endif
+
+/**
+ * MEMP_NUM_TCP_PCB: the number of simulatenously active TCP connections.
+ * (requires the LWIP_TCP option)
+ */
+#ifndef MEMP_NUM_TCP_PCB
+#define MEMP_NUM_TCP_PCB 5
+#endif
+
+/**
+ * MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP connections.
+ * (requires the LWIP_TCP option)
+ */
+#ifndef MEMP_NUM_TCP_PCB_LISTEN
+#define MEMP_NUM_TCP_PCB_LISTEN 8
+#endif
+
+/**
+ * MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP segments.
+ * (requires the LWIP_TCP option)
+ */
+#ifndef MEMP_NUM_TCP_SEG
+#define MEMP_NUM_TCP_SEG 16
+#endif
+
+/**
+ * MEMP_NUM_REASSDATA: the number of IP packets simultaneously queued for
+ * reassembly (whole packets, not fragments!)
+ */
+#ifndef MEMP_NUM_REASSDATA
+#define MEMP_NUM_REASSDATA 5
+#endif
+
+/**
+ * MEMP_NUM_FRAG_PBUF: the number of IP fragments simultaneously sent
+ * (fragments, not whole packets!).
+ * This is only used with IP_FRAG_USES_STATIC_BUF==0 and
+ * LWIP_NETIF_TX_SINGLE_PBUF==0 and only has to be > 1 with DMA-enabled MACs
+ * where the packet is not yet sent when netif->output returns.
+ */
+#ifndef MEMP_NUM_FRAG_PBUF
+#define MEMP_NUM_FRAG_PBUF 15
+#endif
+
+/**
+ * MEMP_NUM_ARP_QUEUE: the number of simulateously queued outgoing
+ * packets (pbufs) that are waiting for an ARP request (to resolve
+ * their destination address) to finish.
+ * (requires the ARP_QUEUEING option)
+ */
+#ifndef MEMP_NUM_ARP_QUEUE
+#define MEMP_NUM_ARP_QUEUE 30
+#endif
+
+/**
+ * MEMP_NUM_IGMP_GROUP: The number of multicast groups whose network interfaces
+ * can be members et the same time (one per netif - allsystems group -, plus one
+ * per netif membership).
+ * (requires the LWIP_IGMP option)
+ */
+#ifndef MEMP_NUM_IGMP_GROUP
+#define MEMP_NUM_IGMP_GROUP 8
+#endif
+
+/**
+ * MEMP_NUM_SYS_TIMEOUT: the number of simulateously active timeouts.
+ * (requires NO_SYS==0)
+ */
+#ifndef MEMP_NUM_SYS_TIMEOUT
+#define MEMP_NUM_SYS_TIMEOUT 3
+#endif
+
+/**
+ * MEMP_NUM_NETBUF: the number of struct netbufs.
+ * (only needed if you use the sequential API, like api_lib.c)
+ */
+#ifndef MEMP_NUM_NETBUF
+#define MEMP_NUM_NETBUF 2
+#endif
+
+/**
+ * MEMP_NUM_NETCONN: the number of struct netconns.
+ * (only needed if you use the sequential API, like api_lib.c)
+ */
+#ifndef MEMP_NUM_NETCONN
+#define MEMP_NUM_NETCONN 4
+#endif
+
+/**
+ * MEMP_NUM_TCPIP_MSG_API: the number of struct tcpip_msg, which are used
+ * for callback/timeout API communication.
+ * (only needed if you use tcpip.c)
+ */
+#ifndef MEMP_NUM_TCPIP_MSG_API
+#define MEMP_NUM_TCPIP_MSG_API 8
+#endif
+
+/**
+ * MEMP_NUM_TCPIP_MSG_INPKT: the number of struct tcpip_msg, which are used
+ * for incoming packets.
+ * (only needed if you use tcpip.c)
+ */
+#ifndef MEMP_NUM_TCPIP_MSG_INPKT
+#define MEMP_NUM_TCPIP_MSG_INPKT 8
+#endif
+
+/**
+ * MEMP_NUM_SNMP_NODE: the number of leafs in the SNMP tree.
+ */
+#ifndef MEMP_NUM_SNMP_NODE
+#define MEMP_NUM_SNMP_NODE 50
+#endif
+
+/**
+ * MEMP_NUM_SNMP_ROOTNODE: the number of branches in the SNMP tree.
+ * Every branch has one leaf (MEMP_NUM_SNMP_NODE) at least!
+ */
+#ifndef MEMP_NUM_SNMP_ROOTNODE
+#define MEMP_NUM_SNMP_ROOTNODE 30
+#endif
+
+/**
+ * MEMP_NUM_SNMP_VARBIND: the number of concurrent requests (does not have to
+ * be changed normally) - 2 of these are used per request (1 for input,
+ * 1 for output)
+ */
+#ifndef MEMP_NUM_SNMP_VARBIND
+#define MEMP_NUM_SNMP_VARBIND 2
+#endif
+
+/**
+ * MEMP_NUM_SNMP_VALUE: the number of OID or values concurrently used
+ * (does not have to be changed normally) - 3 of these are used per request
+ * (1 for the value read and 2 for OIDs - input and output)
+ */
+#ifndef MEMP_NUM_SNMP_VALUE
+#define MEMP_NUM_SNMP_VALUE 3
+#endif
+
+/**
+ * MEMP_NUM_NETDB: the number of concurrently running lwip_addrinfo() calls
+ * (before freeing the corresponding memory using lwip_freeaddrinfo()).
+ */
+#ifndef MEMP_NUM_NETDB
+#define MEMP_NUM_NETDB 1
+#endif
+
+/**
+ * MEMP_NUM_LOCALHOSTLIST: the number of host entries in the local host list
+ * if DNS_LOCAL_HOSTLIST_IS_DYNAMIC==1.
+ */
+#ifndef MEMP_NUM_LOCALHOSTLIST
+#define MEMP_NUM_LOCALHOSTLIST 1
+#endif
+
+/**
+ * MEMP_NUM_PPPOE_INTERFACES: the number of concurrently active PPPoE
+ * interfaces (only used with PPPOE_SUPPORT==1)
+ */
+#ifndef MEMP_NUM_PPPOE_INTERFACES
+#define MEMP_NUM_PPPOE_INTERFACES 1
+#endif
+
+/**
+ * PBUF_POOL_SIZE: the number of buffers in the pbuf pool.
+ */
+#ifndef PBUF_POOL_SIZE
+#define PBUF_POOL_SIZE 16
+#endif
+
+/*
+ ---------------------------------
+ ---------- ARP options ----------
+ ---------------------------------
+*/
+/**
+ * LWIP_ARP==1: Enable ARP functionality.
+ */
+#ifndef LWIP_ARP
+#define LWIP_ARP 1
+#endif
+
+/**
+ * ARP_TABLE_SIZE: Number of active MAC-IP address pairs cached.
+ */
+#ifndef ARP_TABLE_SIZE
+#define ARP_TABLE_SIZE 10
+#endif
+
+/**
+ * ARP_QUEUEING==1: Multiple outgoing packets are queued during hardware address
+ * resolution. By default, only the most recent packet is queued per IP address.
+ * This is sufficient for most protocols and mainly reduces TCP connection
+ * startup time. Set this to 1 if you know your application sends more than one
+ * packet in a row to an IP address that is not in the ARP cache.
+ */
+#ifndef ARP_QUEUEING
+#define ARP_QUEUEING 0
+#endif
+
+/**
+ * ETHARP_TRUST_IP_MAC==1: Incoming IP packets cause the ARP table to be
+ * updated with the source MAC and IP addresses supplied in the packet.
+ * You may want to disable this if you do not trust LAN peers to have the
+ * correct addresses, or as a limited approach to attempt to handle
+ * spoofing. If disabled, lwIP will need to make a new ARP request if
+ * the peer is not already in the ARP table, adding a little latency.
+ * The peer *is* in the ARP table if it requested our address before.
+ * Also notice that this slows down input processing of every IP packet!
+ */
+#ifndef ETHARP_TRUST_IP_MAC
+#define ETHARP_TRUST_IP_MAC 0
+#endif
+
+/**
+ * ETHARP_SUPPORT_VLAN==1: support receiving ethernet packets with VLAN header.
+ * Additionally, you can define ETHARP_VLAN_CHECK to an u16_t VLAN ID to check.
+ * If ETHARP_VLAN_CHECK is defined, only VLAN-traffic for this VLAN is accepted.
+ * If ETHARP_VLAN_CHECK is not defined, all traffic is accepted.
+ */
+#ifndef ETHARP_SUPPORT_VLAN
+#define ETHARP_SUPPORT_VLAN 0
+#endif
+
+/** LWIP_ETHERNET==1: enable ethernet support for PPPoE even though ARP
+ * might be disabled
+ */
+#ifndef LWIP_ETHERNET
+#define LWIP_ETHERNET (LWIP_ARP || PPPOE_SUPPORT)
+#endif
+
+/** ETH_PAD_SIZE: number of bytes added before the ethernet header to ensure
+ * alignment of payload after that header. Since the header is 14 bytes long,
+ * without this padding e.g. addresses in the IP header will not be aligned
+ * on a 32-bit boundary, so setting this to 2 can speed up 32-bit-platforms.
+ */
+#ifndef ETH_PAD_SIZE
+#define ETH_PAD_SIZE 0
+#endif
+
+/** ETHARP_SUPPORT_STATIC_ENTRIES==1: enable code to support static ARP table
+ * entries (using etharp_add_static_entry/etharp_remove_static_entry).
+ */
+#ifndef ETHARP_SUPPORT_STATIC_ENTRIES
+#define ETHARP_SUPPORT_STATIC_ENTRIES 0
+#endif
+
+
+/*
+ --------------------------------
+ ---------- IP options ----------
+ --------------------------------
+*/
+/**
+ * IP_FORWARD==1: Enables the ability to forward IP packets across network
+ * interfaces. If you are going to run lwIP on a device with only one network
+ * interface, define this to 0.
+ */
+#ifndef IP_FORWARD
+#define IP_FORWARD 0
+#endif
+
+/**
+ * IP_OPTIONS_ALLOWED: Defines the behavior for IP options.
+ * IP_OPTIONS_ALLOWED==0: All packets with IP options are dropped.
+ * IP_OPTIONS_ALLOWED==1: IP options are allowed (but not parsed).
+ */
+#ifndef IP_OPTIONS_ALLOWED
+#define IP_OPTIONS_ALLOWED 1
+#endif
+
+/**
+ * IP_REASSEMBLY==1: Reassemble incoming fragmented IP packets. Note that
+ * this option does not affect outgoing packet sizes, which can be controlled
+ * via IP_FRAG.
+ */
+#ifndef IP_REASSEMBLY
+#define IP_REASSEMBLY 1
+#endif
+
+/**
+ * IP_FRAG==1: Fragment outgoing IP packets if their size exceeds MTU. Note
+ * that this option does not affect incoming packet sizes, which can be
+ * controlled via IP_REASSEMBLY.
+ */
+#ifndef IP_FRAG
+#define IP_FRAG 1
+#endif
+
+/**
+ * IP_REASS_MAXAGE: Maximum time (in multiples of IP_TMR_INTERVAL - so seconds, normally)
+ * a fragmented IP packet waits for all fragments to arrive. If not all fragments arrived
+ * in this time, the whole packet is discarded.
+ */
+#ifndef IP_REASS_MAXAGE
+#define IP_REASS_MAXAGE 3
+#endif
+
+/**
+ * IP_REASS_MAX_PBUFS: Total maximum amount of pbufs waiting to be reassembled.
+ * Since the received pbufs are enqueued, be sure to configure
+ * PBUF_POOL_SIZE > IP_REASS_MAX_PBUFS so that the stack is still able to receive
+ * packets even if the maximum amount of fragments is enqueued for reassembly!
+ */
+#ifndef IP_REASS_MAX_PBUFS
+#define IP_REASS_MAX_PBUFS 10
+#endif
+
+/**
+ * IP_FRAG_USES_STATIC_BUF==1: Use a static MTU-sized buffer for IP
+ * fragmentation. Otherwise pbufs are allocated and reference the original
+ * packet data to be fragmented (or with LWIP_NETIF_TX_SINGLE_PBUF==1,
+ * new PBUF_RAM pbufs are used for fragments).
+ * ATTENTION: IP_FRAG_USES_STATIC_BUF==1 may not be used for DMA-enabled MACs!
+ */
+#ifndef IP_FRAG_USES_STATIC_BUF
+#define IP_FRAG_USES_STATIC_BUF 0
+#endif
+
+/**
+ * IP_FRAG_MAX_MTU: Assumed max MTU on any interface for IP frag buffer
+ * (requires IP_FRAG_USES_STATIC_BUF==1)
+ */
+#if IP_FRAG_USES_STATIC_BUF && !defined(IP_FRAG_MAX_MTU)
+#define IP_FRAG_MAX_MTU 1500
+#endif
+
+/**
+ * IP_DEFAULT_TTL: Default value for Time-To-Live used by transport layers.
+ */
+#ifndef IP_DEFAULT_TTL
+#define IP_DEFAULT_TTL 255
+#endif
+
+/**
+ * IP_SOF_BROADCAST=1: Use the SOF_BROADCAST field to enable broadcast
+ * filter per pcb on udp and raw send operations. To enable broadcast filter
+ * on recv operations, you also have to set IP_SOF_BROADCAST_RECV=1.
+ */
+#ifndef IP_SOF_BROADCAST
+#define IP_SOF_BROADCAST 0
+#endif
+
+/**
+ * IP_SOF_BROADCAST_RECV (requires IP_SOF_BROADCAST=1) enable the broadcast
+ * filter on recv operations.
+ */
+#ifndef IP_SOF_BROADCAST_RECV
+#define IP_SOF_BROADCAST_RECV 0
+#endif
+
+/*
+ ----------------------------------
+ ---------- ICMP options ----------
+ ----------------------------------
+*/
+/**
+ * LWIP_ICMP==1: Enable ICMP module inside the IP stack.
+ * Be careful, disable that make your product non-compliant to RFC1122
+ */
+#ifndef LWIP_ICMP
+#define LWIP_ICMP 1
+#endif
+
+/**
+ * ICMP_TTL: Default value for Time-To-Live used by ICMP packets.
+ */
+#ifndef ICMP_TTL
+#define ICMP_TTL (IP_DEFAULT_TTL)
+#endif
+
+/**
+ * LWIP_BROADCAST_PING==1: respond to broadcast pings (default is unicast only)
+ */
+#ifndef LWIP_BROADCAST_PING
+#define LWIP_BROADCAST_PING 0
+#endif
+
+/**
+ * LWIP_MULTICAST_PING==1: respond to multicast pings (default is unicast only)
+ */
+#ifndef LWIP_MULTICAST_PING
+#define LWIP_MULTICAST_PING 0
+#endif
+
+/*
+ ---------------------------------
+ ---------- RAW options ----------
+ ---------------------------------
+*/
+/**
+ * LWIP_RAW==1: Enable application layer to hook into the IP layer itself.
+ */
+#ifndef LWIP_RAW
+#define LWIP_RAW 1
+#endif
+
+/**
+ * LWIP_RAW==1: Enable application layer to hook into the IP layer itself.
+ */
+#ifndef RAW_TTL
+#define RAW_TTL (IP_DEFAULT_TTL)
+#endif
+
+/*
+ ----------------------------------
+ ---------- DHCP options ----------
+ ----------------------------------
+*/
+/**
+ * LWIP_DHCP==1: Enable DHCP module.
+ */
+#ifndef LWIP_DHCP
+#define LWIP_DHCP 0
+#endif
+
+/**
+ * DHCP_DOES_ARP_CHECK==1: Do an ARP check on the offered address.
+ */
+#ifndef DHCP_DOES_ARP_CHECK
+#define DHCP_DOES_ARP_CHECK ((LWIP_DHCP) && (LWIP_ARP))
+#endif
+
+/*
+ ------------------------------------
+ ---------- AUTOIP options ----------
+ ------------------------------------
+*/
+/**
+ * LWIP_AUTOIP==1: Enable AUTOIP module.
+ */
+#ifndef LWIP_AUTOIP
+#define LWIP_AUTOIP 0
+#endif
+
+/**
+ * LWIP_DHCP_AUTOIP_COOP==1: Allow DHCP and AUTOIP to be both enabled on
+ * the same interface at the same time.
+ */
+#ifndef LWIP_DHCP_AUTOIP_COOP
+#define LWIP_DHCP_AUTOIP_COOP 0
+#endif
+
+/**
+ * LWIP_DHCP_AUTOIP_COOP_TRIES: Set to the number of DHCP DISCOVER probes
+ * that should be sent before falling back on AUTOIP. This can be set
+ * as low as 1 to get an AutoIP address very quickly, but you should
+ * be prepared to handle a changing IP address when DHCP overrides
+ * AutoIP.
+ */
+#ifndef LWIP_DHCP_AUTOIP_COOP_TRIES
+#define LWIP_DHCP_AUTOIP_COOP_TRIES 9
+#endif
+
+/*
+ ----------------------------------
+ ---------- SNMP options ----------
+ ----------------------------------
+*/
+/**
+ * LWIP_SNMP==1: Turn on SNMP module. UDP must be available for SNMP
+ * transport.
+ */
+#ifndef LWIP_SNMP
+#define LWIP_SNMP 0
+#endif
+
+/**
+ * SNMP_CONCURRENT_REQUESTS: Number of concurrent requests the module will
+ * allow. At least one request buffer is required.
+ * Does not have to be changed unless external MIBs answer request asynchronously
+ */
+#ifndef SNMP_CONCURRENT_REQUESTS
+#define SNMP_CONCURRENT_REQUESTS 1
+#endif
+
+/**
+ * SNMP_TRAP_DESTINATIONS: Number of trap destinations. At least one trap
+ * destination is required
+ */
+#ifndef SNMP_TRAP_DESTINATIONS
+#define SNMP_TRAP_DESTINATIONS 1
+#endif
+
+/**
+ * SNMP_PRIVATE_MIB:
+ * When using a private MIB, you have to create a file 'private_mib.h' that contains
+ * a 'struct mib_array_node mib_private' which contains your MIB.
+ */
+#ifndef SNMP_PRIVATE_MIB
+#define SNMP_PRIVATE_MIB 0
+#endif
+
+/**
+ * Only allow SNMP write actions that are 'safe' (e.g. disabeling netifs is not
+ * a safe action and disabled when SNMP_SAFE_REQUESTS = 1).
+ * Unsafe requests are disabled by default!
+ */
+#ifndef SNMP_SAFE_REQUESTS
+#define SNMP_SAFE_REQUESTS 1
+#endif
+
+/**
+ * The maximum length of strings used. This affects the size of
+ * MEMP_SNMP_VALUE elements.
+ */
+#ifndef SNMP_MAX_OCTET_STRING_LEN
+#define SNMP_MAX_OCTET_STRING_LEN 127
+#endif
+
+/**
+ * The maximum depth of the SNMP tree.
+ * With private MIBs enabled, this depends on your MIB!
+ * This affects the size of MEMP_SNMP_VALUE elements.
+ */
+#ifndef SNMP_MAX_TREE_DEPTH
+#define SNMP_MAX_TREE_DEPTH 15
+#endif
+
+/**
+ * The size of the MEMP_SNMP_VALUE elements, normally calculated from
+ * SNMP_MAX_OCTET_STRING_LEN and SNMP_MAX_TREE_DEPTH.
+ */
+#ifndef SNMP_MAX_VALUE_SIZE
+#define SNMP_MAX_VALUE_SIZE LWIP_MAX((SNMP_MAX_OCTET_STRING_LEN)+1, sizeof(s32_t)*(SNMP_MAX_TREE_DEPTH))
+#endif
+
+/*
+ ----------------------------------
+ ---------- IGMP options ----------
+ ----------------------------------
+*/
+/**
+ * LWIP_IGMP==1: Turn on IGMP module.
+ */
+#ifndef LWIP_IGMP
+#define LWIP_IGMP 0
+#endif
+
+/*
+ ----------------------------------
+ ---------- DNS options -----------
+ ----------------------------------
+*/
+/**
+ * LWIP_DNS==1: Turn on DNS module. UDP must be available for DNS
+ * transport.
+ */
+#ifndef LWIP_DNS
+#define LWIP_DNS 0
+#endif
+
+/** DNS maximum number of entries to maintain locally. */
+#ifndef DNS_TABLE_SIZE
+#define DNS_TABLE_SIZE 4
+#endif
+
+/** DNS maximum host name length supported in the name table. */
+#ifndef DNS_MAX_NAME_LENGTH
+#define DNS_MAX_NAME_LENGTH 256
+#endif
+
+/** The maximum of DNS servers */
+#ifndef DNS_MAX_SERVERS
+#define DNS_MAX_SERVERS 2
+#endif
+
+/** DNS do a name checking between the query and the response. */
+#ifndef DNS_DOES_NAME_CHECK
+#define DNS_DOES_NAME_CHECK 1
+#endif
+
+/** DNS message max. size. Default value is RFC compliant. */
+#ifndef DNS_MSG_SIZE
+#define DNS_MSG_SIZE 512
+#endif
+
+/** DNS_LOCAL_HOSTLIST: Implements a local host-to-address list. If enabled,
+ * you have to define
+ * #define DNS_LOCAL_HOSTLIST_INIT {{"host1", 0x123}, {"host2", 0x234}}
+ * (an array of structs name/address, where address is an u32_t in network
+ * byte order).
+ *
+ * Instead, you can also use an external function:
+ * #define DNS_LOOKUP_LOCAL_EXTERN(x) extern u32_t my_lookup_function(const char *name)
+ * that returns the IP address or INADDR_NONE if not found.
+ */
+#ifndef DNS_LOCAL_HOSTLIST
+#define DNS_LOCAL_HOSTLIST 0
+#endif /* DNS_LOCAL_HOSTLIST */
+
+/** If this is turned on, the local host-list can be dynamically changed
+ * at runtime. */
+#ifndef DNS_LOCAL_HOSTLIST_IS_DYNAMIC
+#define DNS_LOCAL_HOSTLIST_IS_DYNAMIC 0
+#endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
+
+/*
+ ---------------------------------
+ ---------- UDP options ----------
+ ---------------------------------
+*/
+/**
+ * LWIP_UDP==1: Turn on UDP.
+ */
+#ifndef LWIP_UDP
+#define LWIP_UDP 1
+#endif
+
+/**
+ * LWIP_UDPLITE==1: Turn on UDP-Lite. (Requires LWIP_UDP)
+ */
+#ifndef LWIP_UDPLITE
+#define LWIP_UDPLITE 0
+#endif
+
+/**
+ * UDP_TTL: Default Time-To-Live value.
+ */
+#ifndef UDP_TTL
+#define UDP_TTL (IP_DEFAULT_TTL)
+#endif
+
+/**
+ * LWIP_NETBUF_RECVINFO==1: append destination addr and port to every netbuf.
+ */
+#ifndef LWIP_NETBUF_RECVINFO
+#define LWIP_NETBUF_RECVINFO 0
+#endif
+
+/*
+ ---------------------------------
+ ---------- TCP options ----------
+ ---------------------------------
+*/
+/**
+ * LWIP_TCP==1: Turn on TCP.
+ */
+#ifndef LWIP_TCP
+#define LWIP_TCP 1
+#endif
+
+/**
+ * TCP_TTL: Default Time-To-Live value.
+ */
+#ifndef TCP_TTL
+#define TCP_TTL (IP_DEFAULT_TTL)
+#endif
+
+/**
+ * TCP_WND: The size of a TCP window. This must be at least
+ * (2 * TCP_MSS) for things to work well
+ */
+#ifndef TCP_WND
+#define TCP_WND (4 * TCP_MSS)
+#endif
+
+/**
+ * TCP_MAXRTX: Maximum number of retransmissions of data segments.
+ */
+#ifndef TCP_MAXRTX
+#define TCP_MAXRTX 12
+#endif
+
+/**
+ * TCP_SYNMAXRTX: Maximum number of retransmissions of SYN segments.
+ */
+#ifndef TCP_SYNMAXRTX
+#define TCP_SYNMAXRTX 6
+#endif
+
+/**
+ * TCP_QUEUE_OOSEQ==1: TCP will queue segments that arrive out of order.
+ * Define to 0 if your device is low on memory.
+ */
+#ifndef TCP_QUEUE_OOSEQ
+#define TCP_QUEUE_OOSEQ (LWIP_TCP)
+#endif
+
+/**
+ * TCP_MSS: TCP Maximum segment size. (default is 536, a conservative default,
+ * you might want to increase this.)
+ * For the receive side, this MSS is advertised to the remote side
+ * when opening a connection. For the transmit size, this MSS sets
+ * an upper limit on the MSS advertised by the remote host.
+ */
+#ifndef TCP_MSS
+#define TCP_MSS 536
+#endif
+
+/**
+ * TCP_CALCULATE_EFF_SEND_MSS: "The maximum size of a segment that TCP really
+ * sends, the 'effective send MSS,' MUST be the smaller of the send MSS (which
+ * reflects the available reassembly buffer size at the remote host) and the
+ * largest size permitted by the IP layer" (RFC 1122)
+ * Setting this to 1 enables code that checks TCP_MSS against the MTU of the
+ * netif used for a connection and limits the MSS if it would be too big otherwise.
+ */
+#ifndef TCP_CALCULATE_EFF_SEND_MSS
+#define TCP_CALCULATE_EFF_SEND_MSS 1
+#endif
+
+
+/**
+ * TCP_SND_BUF: TCP sender buffer space (bytes).
+ */
+#ifndef TCP_SND_BUF
+#define TCP_SND_BUF 256
+#endif
+
+/**
+ * TCP_SND_QUEUELEN: TCP sender buffer space (pbufs). This must be at least
+ * as much as (2 * TCP_SND_BUF/TCP_MSS) for things to work.
+ */
+#ifndef TCP_SND_QUEUELEN
+#define TCP_SND_QUEUELEN ((4 * (TCP_SND_BUF) + (TCP_MSS - 1))/(TCP_MSS))
+#endif
+
+/**
+ * TCP_SNDLOWAT: TCP writable space (bytes). This must be less than
+ * TCP_SND_BUF. It is the amount of space which must be available in the
+ * TCP snd_buf for select to return writable (combined with TCP_SNDQUEUELOWAT).
+ */
+#ifndef TCP_SNDLOWAT
+#define TCP_SNDLOWAT ((TCP_SND_BUF)/2)
+#endif
+
+/**
+ * TCP_SNDQUEUELOWAT: TCP writable bufs (pbuf count). This must be grater
+ * than TCP_SND_QUEUELEN. If the number of pbufs queued on a pcb drops below
+ * this number, select returns writable (combined with TCP_SNDLOWAT).
+ */
+#ifndef TCP_SNDQUEUELOWAT
+#define TCP_SNDQUEUELOWAT ((TCP_SND_QUEUELEN)/2)
+#endif
+
+/**
+ * TCP_LISTEN_BACKLOG: Enable the backlog option for tcp listen pcb.
+ */
+#ifndef TCP_LISTEN_BACKLOG
+#define TCP_LISTEN_BACKLOG 0
+#endif
+
+/**
+ * The maximum allowed backlog for TCP listen netconns.
+ * This backlog is used unless another is explicitly specified.
+ * 0xff is the maximum (u8_t).
+ */
+#ifndef TCP_DEFAULT_LISTEN_BACKLOG
+#define TCP_DEFAULT_LISTEN_BACKLOG 0xff
+#endif
+
+/**
+ * TCP_OVERSIZE: The maximum number of bytes that tcp_write may
+ * allocate ahead of time in an attempt to create shorter pbuf chains
+ * for transmission. The meaningful range is 0 to TCP_MSS. Some
+ * suggested values are:
+ *
+ * 0: Disable oversized allocation. Each tcp_write() allocates a new
+ pbuf (old behaviour).
+ * 1: Allocate size-aligned pbufs with minimal excess. Use this if your
+ * scatter-gather DMA requires aligned fragments.
+ * 128: Limit the pbuf/memory overhead to 20%.
+ * TCP_MSS: Try to create unfragmented TCP packets.
+ * TCP_MSS/4: Try to create 4 fragments or less per TCP packet.
+ */
+#ifndef TCP_OVERSIZE
+#define TCP_OVERSIZE TCP_MSS
+#endif
+
+/**
+ * LWIP_TCP_TIMESTAMPS==1: support the TCP timestamp option.
+ */
+#ifndef LWIP_TCP_TIMESTAMPS
+#define LWIP_TCP_TIMESTAMPS 0
+#endif
+
+/**
+ * TCP_WND_UPDATE_THRESHOLD: difference in window to trigger an
+ * explicit window update
+ */
+#ifndef TCP_WND_UPDATE_THRESHOLD
+#define TCP_WND_UPDATE_THRESHOLD (TCP_WND / 4)
+#endif
+
+/**
+ * LWIP_EVENT_API and LWIP_CALLBACK_API: Only one of these should be set to 1.
+ * LWIP_EVENT_API==1: The user defines lwip_tcp_event() to receive all
+ * events (accept, sent, etc) that happen in the system.
+ * LWIP_CALLBACK_API==1: The PCB callback function is called directly
+ * for the event.
+ */
+#ifndef LWIP_EVENT_API
+#define LWIP_EVENT_API 0
+#define LWIP_CALLBACK_API 1
+#else
+#define LWIP_EVENT_API 1
+#define LWIP_CALLBACK_API 0
+#endif
+
+
+/*
+ ----------------------------------
+ ---------- Pbuf options ----------
+ ----------------------------------
+*/
+/**
+ * PBUF_LINK_HLEN: the number of bytes that should be allocated for a
+ * link level header. The default is 14, the standard value for
+ * Ethernet.
+ */
+#ifndef PBUF_LINK_HLEN
+#define PBUF_LINK_HLEN (14 + ETH_PAD_SIZE)
+#endif
+
+/**
+ * PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. The default is
+ * designed to accomodate single full size TCP frame in one pbuf, including
+ * TCP_MSS, IP header, and link header.
+ */
+#ifndef PBUF_POOL_BUFSIZE
+#define PBUF_POOL_BUFSIZE LWIP_MEM_ALIGN_SIZE(TCP_MSS+40+PBUF_LINK_HLEN)
+#endif
+
+/*
+ ------------------------------------------------
+ ---------- Network Interfaces options ----------
+ ------------------------------------------------
+*/
+/**
+ * LWIP_NETIF_HOSTNAME==1: use DHCP_OPTION_HOSTNAME with netif's hostname
+ * field.
+ */
+#ifndef LWIP_NETIF_HOSTNAME
+#define LWIP_NETIF_HOSTNAME 0
+#endif
+
+/**
+ * LWIP_NETIF_API==1: Support netif api (in netifapi.c)
+ */
+#ifndef LWIP_NETIF_API
+#define LWIP_NETIF_API 0
+#endif
+
+/**
+ * LWIP_NETIF_STATUS_CALLBACK==1: Support a callback function whenever an interface
+ * changes its up/down status (i.e., due to DHCP IP acquistion)
+ */
+#ifndef LWIP_NETIF_STATUS_CALLBACK
+#define LWIP_NETIF_STATUS_CALLBACK 0
+#endif
+
+/**
+ * LWIP_NETIF_LINK_CALLBACK==1: Support a callback function from an interface
+ * whenever the link changes (i.e., link down)
+ */
+#ifndef LWIP_NETIF_LINK_CALLBACK
+#define LWIP_NETIF_LINK_CALLBACK 0
+#endif
+
+/**
+ * LWIP_NETIF_HWADDRHINT==1: Cache link-layer-address hints (e.g. table
+ * indices) in struct netif. TCP and UDP can make use of this to prevent
+ * scanning the ARP table for every sent packet. While this is faster for big
+ * ARP tables or many concurrent connections, it might be counterproductive
+ * if you have a tiny ARP table or if there never are concurrent connections.
+ */
+#ifndef LWIP_NETIF_HWADDRHINT
+#define LWIP_NETIF_HWADDRHINT 0
+#endif
+
+/**
+ * LWIP_NETIF_LOOPBACK==1: Support sending packets with a destination IP
+ * address equal to the netif IP address, looping them back up the stack.
+ */
+#ifndef LWIP_NETIF_LOOPBACK
+#define LWIP_NETIF_LOOPBACK 0
+#endif
+
+/**
+ * LWIP_LOOPBACK_MAX_PBUFS: Maximum number of pbufs on queue for loopback
+ * sending for each netif (0 = disabled)
+ */
+#ifndef LWIP_LOOPBACK_MAX_PBUFS
+#define LWIP_LOOPBACK_MAX_PBUFS 0
+#endif
+
+/**
+ * LWIP_NETIF_LOOPBACK_MULTITHREADING: Indicates whether threading is enabled in
+ * the system, as netifs must change how they behave depending on this setting
+ * for the LWIP_NETIF_LOOPBACK option to work.
+ * Setting this is needed to avoid reentering non-reentrant functions like
+ * tcp_input().
+ * LWIP_NETIF_LOOPBACK_MULTITHREADING==1: Indicates that the user is using a
+ * multithreaded environment like tcpip.c. In this case, netif->input()
+ * is called directly.
+ * LWIP_NETIF_LOOPBACK_MULTITHREADING==0: Indicates a polling (or NO_SYS) setup.
+ * The packets are put on a list and netif_poll() must be called in
+ * the main application loop.
+ */
+#ifndef LWIP_NETIF_LOOPBACK_MULTITHREADING
+#define LWIP_NETIF_LOOPBACK_MULTITHREADING (!NO_SYS)
+#endif
+
+/**
+ * LWIP_NETIF_TX_SINGLE_PBUF: if this is set to 1, lwIP tries to put all data
+ * to be sent into one single pbuf. This is for compatibility with DMA-enabled
+ * MACs that do not support scatter-gather.
+ * Beware that this might involve CPU-memcpy before transmitting that would not
+ * be needed without this flag! Use this only if you need to!
+ *
+ * @todo: TCP and IP-frag do not work with this, yet:
+ */
+#ifndef LWIP_NETIF_TX_SINGLE_PBUF
+#define LWIP_NETIF_TX_SINGLE_PBUF 0
+#endif /* LWIP_NETIF_TX_SINGLE_PBUF */
+
+/*
+ ------------------------------------
+ ---------- LOOPIF options ----------
+ ------------------------------------
+*/
+/**
+ * LWIP_HAVE_LOOPIF==1: Support loop interface (127.0.0.1) and loopif.c
+ */
+#ifndef LWIP_HAVE_LOOPIF
+#define LWIP_HAVE_LOOPIF 0
+#endif
+
+/*
+ ------------------------------------
+ ---------- SLIPIF options ----------
+ ------------------------------------
+*/
+/**
+ * LWIP_HAVE_SLIPIF==1: Support slip interface and slipif.c
+ */
+#ifndef LWIP_HAVE_SLIPIF
+#define LWIP_HAVE_SLIPIF 0
+#endif
+
+/*
+ ------------------------------------
+ ---------- Thread options ----------
+ ------------------------------------
+*/
+/**
+ * TCPIP_THREAD_NAME: The name assigned to the main tcpip thread.
+ */
+#ifndef TCPIP_THREAD_NAME
+#define TCPIP_THREAD_NAME "tcpip_thread"
+#endif
+
+/**
+ * TCPIP_THREAD_STACKSIZE: The stack size used by the main tcpip thread.
+ * The stack size value itself is platform-dependent, but is passed to
+ * sys_thread_new() when the thread is created.
+ */
+#ifndef TCPIP_THREAD_STACKSIZE
+#define TCPIP_THREAD_STACKSIZE 0
+#endif
+
+/**
+ * TCPIP_THREAD_PRIO: The priority assigned to the main tcpip thread.
+ * The priority value itself is platform-dependent, but is passed to
+ * sys_thread_new() when the thread is created.
+ */
+#ifndef TCPIP_THREAD_PRIO
+#define TCPIP_THREAD_PRIO 1
+#endif
+
+/**
+ * TCPIP_MBOX_SIZE: The mailbox size for the tcpip thread messages
+ * The queue size value itself is platform-dependent, but is passed to
+ * sys_mbox_new() when tcpip_init is called.
+ */
+#ifndef TCPIP_MBOX_SIZE
+#define TCPIP_MBOX_SIZE 0
+#endif
+
+/**
+ * SLIPIF_THREAD_NAME: The name assigned to the slipif_loop thread.
+ */
+#ifndef SLIPIF_THREAD_NAME
+#define SLIPIF_THREAD_NAME "slipif_loop"
+#endif
+
+/**
+ * SLIP_THREAD_STACKSIZE: The stack size used by the slipif_loop thread.
+ * The stack size value itself is platform-dependent, but is passed to
+ * sys_thread_new() when the thread is created.
+ */
+#ifndef SLIPIF_THREAD_STACKSIZE
+#define SLIPIF_THREAD_STACKSIZE 0
+#endif
+
+/**
+ * SLIPIF_THREAD_PRIO: The priority assigned to the slipif_loop thread.
+ * The priority value itself is platform-dependent, but is passed to
+ * sys_thread_new() when the thread is created.
+ */
+#ifndef SLIPIF_THREAD_PRIO
+#define SLIPIF_THREAD_PRIO 1
+#endif
+
+/**
+ * PPP_THREAD_NAME: The name assigned to the pppInputThread.
+ */
+#ifndef PPP_THREAD_NAME
+#define PPP_THREAD_NAME "pppInputThread"
+#endif
+
+/**
+ * PPP_THREAD_STACKSIZE: The stack size used by the pppInputThread.
+ * The stack size value itself is platform-dependent, but is passed to
+ * sys_thread_new() when the thread is created.
+ */
+#ifndef PPP_THREAD_STACKSIZE
+#define PPP_THREAD_STACKSIZE 0
+#endif
+
+/**
+ * PPP_THREAD_PRIO: The priority assigned to the pppInputThread.
+ * The priority value itself is platform-dependent, but is passed to
+ * sys_thread_new() when the thread is created.
+ */
+#ifndef PPP_THREAD_PRIO
+#define PPP_THREAD_PRIO 1
+#endif
+
+/**
+ * DEFAULT_THREAD_NAME: The name assigned to any other lwIP thread.
+ */
+#ifndef DEFAULT_THREAD_NAME
+#define DEFAULT_THREAD_NAME "lwIP"
+#endif
+
+/**
+ * DEFAULT_THREAD_STACKSIZE: The stack size used by any other lwIP thread.
+ * The stack size value itself is platform-dependent, but is passed to
+ * sys_thread_new() when the thread is created.
+ */
+#ifndef DEFAULT_THREAD_STACKSIZE
+#define DEFAULT_THREAD_STACKSIZE 0
+#endif
+
+/**
+ * DEFAULT_THREAD_PRIO: The priority assigned to any other lwIP thread.
+ * The priority value itself is platform-dependent, but is passed to
+ * sys_thread_new() when the thread is created.
+ */
+#ifndef DEFAULT_THREAD_PRIO
+#define DEFAULT_THREAD_PRIO 1
+#endif
+
+/**
+ * DEFAULT_RAW_RECVMBOX_SIZE: The mailbox size for the incoming packets on a
+ * NETCONN_RAW. The queue size value itself is platform-dependent, but is passed
+ * to sys_mbox_new() when the recvmbox is created.
+ */
+#ifndef DEFAULT_RAW_RECVMBOX_SIZE
+#define DEFAULT_RAW_RECVMBOX_SIZE 0
+#endif
+
+/**
+ * DEFAULT_UDP_RECVMBOX_SIZE: The mailbox size for the incoming packets on a
+ * NETCONN_UDP. The queue size value itself is platform-dependent, but is passed
+ * to sys_mbox_new() when the recvmbox is created.
+ */
+#ifndef DEFAULT_UDP_RECVMBOX_SIZE
+#define DEFAULT_UDP_RECVMBOX_SIZE 0
+#endif
+
+/**
+ * DEFAULT_TCP_RECVMBOX_SIZE: The mailbox size for the incoming packets on a
+ * NETCONN_TCP. The queue size value itself is platform-dependent, but is passed
+ * to sys_mbox_new() when the recvmbox is created.
+ */
+#ifndef DEFAULT_TCP_RECVMBOX_SIZE
+#define DEFAULT_TCP_RECVMBOX_SIZE 0
+#endif
+
+/**
+ * DEFAULT_ACCEPTMBOX_SIZE: The mailbox size for the incoming connections.
+ * The queue size value itself is platform-dependent, but is passed to
+ * sys_mbox_new() when the acceptmbox is created.
+ */
+#ifndef DEFAULT_ACCEPTMBOX_SIZE
+#define DEFAULT_ACCEPTMBOX_SIZE 0
+#endif
+
+/*
+ ----------------------------------------------
+ ---------- Sequential layer options ----------
+ ----------------------------------------------
+*/
+/**
+ * LWIP_TCPIP_CORE_LOCKING: (EXPERIMENTAL!)
+ * Don't use it if you're not an active lwIP project member
+ */
+#ifndef LWIP_TCPIP_CORE_LOCKING
+#define LWIP_TCPIP_CORE_LOCKING 0
+#endif
+
+/**
+ * LWIP_TCPIP_CORE_LOCKING_INPUT: (EXPERIMENTAL!)
+ * Don't use it if you're not an active lwIP project member
+ */
+#ifndef LWIP_TCPIP_CORE_LOCKING_INPUT
+#define LWIP_TCPIP_CORE_LOCKING_INPUT 0
+#endif
+
+/**
+ * LWIP_NETCONN==1: Enable Netconn API (require to use api_lib.c)
+ */
+#ifndef LWIP_NETCONN
+#define LWIP_NETCONN 1
+#endif
+
+/** LWIP_TCPIP_TIMEOUT==1: Enable tcpip_timeout/tcpip_untimeout tod create
+ * timers running in tcpip_thread from another thread.
+ */
+#ifndef LWIP_TCPIP_TIMEOUT
+#define LWIP_TCPIP_TIMEOUT 1
+#endif
+
+/*
+ ------------------------------------
+ ---------- Socket options ----------
+ ------------------------------------
+*/
+/**
+ * LWIP_SOCKET==1: Enable Socket API (require to use sockets.c)
+ */
+#ifndef LWIP_SOCKET
+#define LWIP_SOCKET 1
+#endif
+
+/**
+ * LWIP_COMPAT_SOCKETS==1: Enable BSD-style sockets functions names.
+ * (only used if you use sockets.c)
+ */
+#ifndef LWIP_COMPAT_SOCKETS
+#define LWIP_COMPAT_SOCKETS 1
+#endif
+
+/**
+ * LWIP_POSIX_SOCKETS_IO_NAMES==1: Enable POSIX-style sockets functions names.
+ * Disable this option if you use a POSIX operating system that uses the same
+ * names (read, write & close). (only used if you use sockets.c)
+ */
+#ifndef LWIP_POSIX_SOCKETS_IO_NAMES
+#define LWIP_POSIX_SOCKETS_IO_NAMES 1
+#endif
+
+/**
+ * LWIP_TCP_KEEPALIVE==1: Enable TCP_KEEPIDLE, TCP_KEEPINTVL and TCP_KEEPCNT
+ * options processing. Note that TCP_KEEPIDLE and TCP_KEEPINTVL have to be set
+ * in seconds. (does not require sockets.c, and will affect tcp.c)
+ */
+#ifndef LWIP_TCP_KEEPALIVE
+#define LWIP_TCP_KEEPALIVE 0
+#endif
+
+/**
+ * LWIP_SO_RCVTIMEO==1: Enable SO_RCVTIMEO processing.
+ */
+#ifndef LWIP_SO_RCVTIMEO
+#define LWIP_SO_RCVTIMEO 0
+#endif
+
+/**
+ * LWIP_SO_RCVBUF==1: Enable SO_RCVBUF processing.
+ */
+#ifndef LWIP_SO_RCVBUF
+#define LWIP_SO_RCVBUF 0
+#endif
+
+/**
+ * If LWIP_SO_RCVBUF is used, this is the default value for recv_bufsize.
+ */
+#ifndef RECV_BUFSIZE_DEFAULT
+#define RECV_BUFSIZE_DEFAULT INT_MAX
+#endif
+
+/**
+ * SO_REUSE==1: Enable SO_REUSEADDR option.
+ */
+#ifndef SO_REUSE
+#define SO_REUSE 0
+#endif
+
+/**
+ * SO_REUSE_RXTOALL==1: Pass a copy of incoming broadcast/multicast packets
+ * to all local matches if SO_REUSEADDR is turned on.
+ * WARNING: Adds a memcpy for every packet if passing to more than one pcb!
+ */
+#ifndef SO_REUSE_RXTOALL
+#define SO_REUSE_RXTOALL 0
+#endif
+
+/*
+ ----------------------------------------
+ ---------- Statistics options ----------
+ ----------------------------------------
+*/
+/**
+ * LWIP_STATS==1: Enable statistics collection in lwip_stats.
+ */
+#ifndef LWIP_STATS
+#define LWIP_STATS 1
+#endif
+
+#if LWIP_STATS
+
+/**
+ * LWIP_STATS_DISPLAY==1: Compile in the statistics output functions.
+ */
+#ifndef LWIP_STATS_DISPLAY
+#define LWIP_STATS_DISPLAY 0
+#endif
+
+/**
+ * LINK_STATS==1: Enable link stats.
+ */
+#ifndef LINK_STATS
+#define LINK_STATS 1
+#endif
+
+/**
+ * ETHARP_STATS==1: Enable etharp stats.
+ */
+#ifndef ETHARP_STATS
+#define ETHARP_STATS (LWIP_ARP)
+#endif
+
+/**
+ * IP_STATS==1: Enable IP stats.
+ */
+#ifndef IP_STATS
+#define IP_STATS 1
+#endif
+
+/**
+ * IPFRAG_STATS==1: Enable IP fragmentation stats. Default is
+ * on if using either frag or reass.
+ */
+#ifndef IPFRAG_STATS
+#define IPFRAG_STATS (IP_REASSEMBLY || IP_FRAG)
+#endif
+
+/**
+ * ICMP_STATS==1: Enable ICMP stats.
+ */
+#ifndef ICMP_STATS
+#define ICMP_STATS 1
+#endif
+
+/**
+ * IGMP_STATS==1: Enable IGMP stats.
+ */
+#ifndef IGMP_STATS
+#define IGMP_STATS (LWIP_IGMP)
+#endif
+
+/**
+ * UDP_STATS==1: Enable UDP stats. Default is on if
+ * UDP enabled, otherwise off.
+ */
+#ifndef UDP_STATS
+#define UDP_STATS (LWIP_UDP)
+#endif
+
+/**
+ * TCP_STATS==1: Enable TCP stats. Default is on if TCP
+ * enabled, otherwise off.
+ */
+#ifndef TCP_STATS
+#define TCP_STATS (LWIP_TCP)
+#endif
+
+/**
+ * MEM_STATS==1: Enable mem.c stats.
+ */
+#ifndef MEM_STATS
+#define MEM_STATS ((MEM_LIBC_MALLOC == 0) && (MEM_USE_POOLS == 0))
+#endif
+
+/**
+ * MEMP_STATS==1: Enable memp.c pool stats.
+ */
+#ifndef MEMP_STATS
+#define MEMP_STATS (MEMP_MEM_MALLOC == 0)
+#endif
+
+/**
+ * SYS_STATS==1: Enable system stats (sem and mbox counts, etc).
+ */
+#ifndef SYS_STATS
+#define SYS_STATS (NO_SYS == 0)
+#endif
+
+#else
+
+#define LINK_STATS 0
+#define IP_STATS 0
+#define IPFRAG_STATS 0
+#define ICMP_STATS 0
+#define IGMP_STATS 0
+#define UDP_STATS 0
+#define TCP_STATS 0
+#define MEM_STATS 0
+#define MEMP_STATS 0
+#define SYS_STATS 0
+#define LWIP_STATS_DISPLAY 0
+
+#endif /* LWIP_STATS */
+
+/*
+ ---------------------------------
+ ---------- PPP options ----------
+ ---------------------------------
+*/
+/**
+ * PPP_SUPPORT==1: Enable PPP.
+ */
+#ifndef PPP_SUPPORT
+#define PPP_SUPPORT 0
+#endif
+
+/**
+ * PPPOE_SUPPORT==1: Enable PPP Over Ethernet
+ */
+#ifndef PPPOE_SUPPORT
+#define PPPOE_SUPPORT 0
+#endif
+
+/**
+ * PPPOS_SUPPORT==1: Enable PPP Over Serial
+ */
+#ifndef PPPOS_SUPPORT
+#define PPPOS_SUPPORT PPP_SUPPORT
+#endif
+
+#if PPP_SUPPORT
+
+/**
+ * NUM_PPP: Max PPP sessions.
+ */
+#ifndef NUM_PPP
+#define NUM_PPP 1
+#endif
+
+/**
+ * PAP_SUPPORT==1: Support PAP.
+ */
+#ifndef PAP_SUPPORT
+#define PAP_SUPPORT 0
+#endif
+
+/**
+ * CHAP_SUPPORT==1: Support CHAP.
+ */
+#ifndef CHAP_SUPPORT
+#define CHAP_SUPPORT 0
+#endif
+
+/**
+ * MSCHAP_SUPPORT==1: Support MSCHAP. CURRENTLY NOT SUPPORTED! DO NOT SET!
+ */
+#ifndef MSCHAP_SUPPORT
+#define MSCHAP_SUPPORT 0
+#endif
+
+/**
+ * CBCP_SUPPORT==1: Support CBCP. CURRENTLY NOT SUPPORTED! DO NOT SET!
+ */
+#ifndef CBCP_SUPPORT
+#define CBCP_SUPPORT 0
+#endif
+
+/**
+ * CCP_SUPPORT==1: Support CCP. CURRENTLY NOT SUPPORTED! DO NOT SET!
+ */
+#ifndef CCP_SUPPORT
+#define CCP_SUPPORT 0
+#endif
+
+/**
+ * VJ_SUPPORT==1: Support VJ header compression.
+ */
+#ifndef VJ_SUPPORT
+#define VJ_SUPPORT 0
+#endif
+
+/**
+ * MD5_SUPPORT==1: Support MD5 (see also CHAP).
+ */
+#ifndef MD5_SUPPORT
+#define MD5_SUPPORT 0
+#endif
+
+/*
+ * Timeouts
+ */
+#ifndef FSM_DEFTIMEOUT
+#define FSM_DEFTIMEOUT 6 /* Timeout time in seconds */
+#endif
+
+#ifndef FSM_DEFMAXTERMREQS
+#define FSM_DEFMAXTERMREQS 2 /* Maximum Terminate-Request transmissions */
+#endif
+
+#ifndef FSM_DEFMAXCONFREQS
+#define FSM_DEFMAXCONFREQS 10 /* Maximum Configure-Request transmissions */
+#endif
+
+#ifndef FSM_DEFMAXNAKLOOPS
+#define FSM_DEFMAXNAKLOOPS 5 /* Maximum number of nak loops */
+#endif
+
+#ifndef UPAP_DEFTIMEOUT
+#define UPAP_DEFTIMEOUT 6 /* Timeout (seconds) for retransmitting req */
+#endif
+
+#ifndef UPAP_DEFREQTIME
+#define UPAP_DEFREQTIME 30 /* Time to wait for auth-req from peer */
+#endif
+
+#ifndef CHAP_DEFTIMEOUT
+#define CHAP_DEFTIMEOUT 6 /* Timeout time in seconds */
+#endif
+
+#ifndef CHAP_DEFTRANSMITS
+#define CHAP_DEFTRANSMITS 10 /* max # times to send challenge */
+#endif
+
+/* Interval in seconds between keepalive echo requests, 0 to disable. */
+#ifndef LCP_ECHOINTERVAL
+#define LCP_ECHOINTERVAL 0
+#endif
+
+/* Number of unanswered echo requests before failure. */
+#ifndef LCP_MAXECHOFAILS
+#define LCP_MAXECHOFAILS 3
+#endif
+
+/* Max Xmit idle time (in jiffies) before resend flag char. */
+#ifndef PPP_MAXIDLEFLAG
+#define PPP_MAXIDLEFLAG 100
+#endif
+
+/*
+ * Packet sizes
+ *
+ * Note - lcp shouldn't be allowed to negotiate stuff outside these
+ * limits. See lcp.h in the pppd directory.
+ * (XXX - these constants should simply be shared by lcp.c instead
+ * of living in lcp.h)
+ */
+#define PPP_MTU 1500 /* Default MTU (size of Info field) */
+#ifndef PPP_MAXMTU
+/* #define PPP_MAXMTU 65535 - (PPP_HDRLEN + PPP_FCSLEN) */
+#define PPP_MAXMTU 1500 /* Largest MTU we allow */
+#endif
+#define PPP_MINMTU 64
+#define PPP_MRU 1500 /* default MRU = max length of info field */
+#define PPP_MAXMRU 1500 /* Largest MRU we allow */
+#ifndef PPP_DEFMRU
+#define PPP_DEFMRU 296 /* Try for this */
+#endif
+#define PPP_MINMRU 128 /* No MRUs below this */
+
+#ifndef MAXNAMELEN
+#define MAXNAMELEN 256 /* max length of hostname or name for auth */
+#endif
+#ifndef MAXSECRETLEN
+#define MAXSECRETLEN 256 /* max length of password or secret */
+#endif
+
+#endif /* PPP_SUPPORT */
+
+/*
+ --------------------------------------
+ ---------- Checksum options ----------
+ --------------------------------------
+*/
+/**
+ * CHECKSUM_GEN_IP==1: Generate checksums in software for outgoing IP packets.
+ */
+#ifndef CHECKSUM_GEN_IP
+#define CHECKSUM_GEN_IP 1
+#endif
+
+/**
+ * CHECKSUM_GEN_UDP==1: Generate checksums in software for outgoing UDP packets.
+ */
+#ifndef CHECKSUM_GEN_UDP
+#define CHECKSUM_GEN_UDP 1
+#endif
+
+/**
+ * CHECKSUM_GEN_TCP==1: Generate checksums in software for outgoing TCP packets.
+ */
+#ifndef CHECKSUM_GEN_TCP
+#define CHECKSUM_GEN_TCP 1
+#endif
+
+/**
+ * CHECKSUM_CHECK_IP==1: Check checksums in software for incoming IP packets.
+ */
+#ifndef CHECKSUM_CHECK_IP
+#define CHECKSUM_CHECK_IP 1
+#endif
+
+/**
+ * CHECKSUM_CHECK_UDP==1: Check checksums in software for incoming UDP packets.
+ */
+#ifndef CHECKSUM_CHECK_UDP
+#define CHECKSUM_CHECK_UDP 1
+#endif
+
+/**
+ * CHECKSUM_CHECK_TCP==1: Check checksums in software for incoming TCP packets.
+ */
+#ifndef CHECKSUM_CHECK_TCP
+#define CHECKSUM_CHECK_TCP 1
+#endif
+
+/**
+ * LWIP_CHECKSUM_ON_COPY==1: Calculate checksum when copying data from
+ * application buffers to pbufs.
+ */
+#ifndef LWIP_CHECKSUM_ON_COPY
+#define LWIP_CHECKSUM_ON_COPY 0
+#endif
+
+/*
+ ---------------------------------------
+ ---------- Debugging options ----------
+ ---------------------------------------
+*/
+/**
+ * LWIP_DBG_MIN_LEVEL: After masking, the value of the debug is
+ * compared against this value. If it is smaller, then debugging
+ * messages are written.
+ */
+#ifndef LWIP_DBG_MIN_LEVEL
+#define LWIP_DBG_MIN_LEVEL LWIP_DBG_LEVEL_ALL
+#endif
+
+/**
+ * LWIP_DBG_TYPES_ON: A mask that can be used to globally enable/disable
+ * debug messages of certain types.
+ */
+#ifndef LWIP_DBG_TYPES_ON
+#define LWIP_DBG_TYPES_ON LWIP_DBG_ON
+#endif
+
+/**
+ * ETHARP_DEBUG: Enable debugging in etharp.c.
+ */
+#ifndef ETHARP_DEBUG
+#define ETHARP_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * NETIF_DEBUG: Enable debugging in netif.c.
+ */
+#ifndef NETIF_DEBUG
+#define NETIF_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * PBUF_DEBUG: Enable debugging in pbuf.c.
+ */
+#ifndef PBUF_DEBUG
+#define PBUF_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * API_LIB_DEBUG: Enable debugging in api_lib.c.
+ */
+#ifndef API_LIB_DEBUG
+#define API_LIB_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * API_MSG_DEBUG: Enable debugging in api_msg.c.
+ */
+#ifndef API_MSG_DEBUG
+#define API_MSG_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * SOCKETS_DEBUG: Enable debugging in sockets.c.
+ */
+#ifndef SOCKETS_DEBUG
+#define SOCKETS_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * ICMP_DEBUG: Enable debugging in icmp.c.
+ */
+#ifndef ICMP_DEBUG
+#define ICMP_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * IGMP_DEBUG: Enable debugging in igmp.c.
+ */
+#ifndef IGMP_DEBUG
+#define IGMP_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * INET_DEBUG: Enable debugging in inet.c.
+ */
+#ifndef INET_DEBUG
+#define INET_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * IP_DEBUG: Enable debugging for IP.
+ */
+#ifndef IP_DEBUG
+#define IP_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * IP_REASS_DEBUG: Enable debugging in ip_frag.c for both frag & reass.
+ */
+#ifndef IP_REASS_DEBUG
+#define IP_REASS_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * RAW_DEBUG: Enable debugging in raw.c.
+ */
+#ifndef RAW_DEBUG
+#define RAW_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * MEM_DEBUG: Enable debugging in mem.c.
+ */
+#ifndef MEM_DEBUG
+#define MEM_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * MEMP_DEBUG: Enable debugging in memp.c.
+ */
+#ifndef MEMP_DEBUG
+#define MEMP_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * SYS_DEBUG: Enable debugging in sys.c.
+ */
+#ifndef SYS_DEBUG
+#define SYS_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * TIMERS_DEBUG: Enable debugging in timers.c.
+ */
+#ifndef TIMERS_DEBUG
+#define TIMERS_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * TCP_DEBUG: Enable debugging for TCP.
+ */
+#ifndef TCP_DEBUG
+#define TCP_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * TCP_INPUT_DEBUG: Enable debugging in tcp_in.c for incoming debug.
+ */
+#ifndef TCP_INPUT_DEBUG
+#define TCP_INPUT_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * TCP_FR_DEBUG: Enable debugging in tcp_in.c for fast retransmit.
+ */
+#ifndef TCP_FR_DEBUG
+#define TCP_FR_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * TCP_RTO_DEBUG: Enable debugging in TCP for retransmit
+ * timeout.
+ */
+#ifndef TCP_RTO_DEBUG
+#define TCP_RTO_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * TCP_CWND_DEBUG: Enable debugging for TCP congestion window.
+ */
+#ifndef TCP_CWND_DEBUG
+#define TCP_CWND_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * TCP_WND_DEBUG: Enable debugging in tcp_in.c for window updating.
+ */
+#ifndef TCP_WND_DEBUG
+#define TCP_WND_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * TCP_OUTPUT_DEBUG: Enable debugging in tcp_out.c output functions.
+ */
+#ifndef TCP_OUTPUT_DEBUG
+#define TCP_OUTPUT_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * TCP_RST_DEBUG: Enable debugging for TCP with the RST message.
+ */
+#ifndef TCP_RST_DEBUG
+#define TCP_RST_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * TCP_QLEN_DEBUG: Enable debugging for TCP queue lengths.
+ */
+#ifndef TCP_QLEN_DEBUG
+#define TCP_QLEN_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * UDP_DEBUG: Enable debugging in UDP.
+ */
+#ifndef UDP_DEBUG
+#define UDP_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * TCPIP_DEBUG: Enable debugging in tcpip.c.
+ */
+#ifndef TCPIP_DEBUG
+#define TCPIP_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * PPP_DEBUG: Enable debugging for PPP.
+ */
+#ifndef PPP_DEBUG
+#define PPP_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * SLIP_DEBUG: Enable debugging in slipif.c.
+ */
+#ifndef SLIP_DEBUG
+#define SLIP_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * DHCP_DEBUG: Enable debugging in dhcp.c.
+ */
+#ifndef DHCP_DEBUG
+#define DHCP_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * AUTOIP_DEBUG: Enable debugging in autoip.c.
+ */
+#ifndef AUTOIP_DEBUG
+#define AUTOIP_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * SNMP_MSG_DEBUG: Enable debugging for SNMP messages.
+ */
+#ifndef SNMP_MSG_DEBUG
+#define SNMP_MSG_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * SNMP_MIB_DEBUG: Enable debugging for SNMP MIBs.
+ */
+#ifndef SNMP_MIB_DEBUG
+#define SNMP_MIB_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * DNS_DEBUG: Enable debugging for DNS.
+ */
+#ifndef DNS_DEBUG
+#define DNS_DEBUG LWIP_DBG_OFF
+#endif
+
+#endif /* __LWIP_OPT_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#ifndef __LWIP_PBUF_H__
+#define __LWIP_PBUF_H__
+
+#include "lwip/opt.h"
+#include "lwip/err.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Currently, the pbuf_custom code is only needed for one specific configuration
+ * of IP_FRAG */
+#define LWIP_SUPPORT_CUSTOM_PBUF (IP_FRAG && !IP_FRAG_USES_STATIC_BUF && !LWIP_NETIF_TX_SINGLE_PBUF)
+
+#define PBUF_TRANSPORT_HLEN 20
+#define PBUF_IP_HLEN 20
+
+typedef enum {
+ PBUF_TRANSPORT,
+ PBUF_IP,
+ PBUF_LINK,
+ PBUF_RAW
+} pbuf_layer;
+
+typedef enum {
+ PBUF_RAM, /* pbuf data is stored in RAM */
+ PBUF_ROM, /* pbuf data is stored in ROM */
+ PBUF_REF, /* pbuf comes from the pbuf pool */
+ PBUF_POOL /* pbuf payload refers to RAM */
+} pbuf_type;
+
+
+/** indicates this packet's data should be immediately passed to the application */
+#define PBUF_FLAG_PUSH 0x01U
+/** indicates this is a custom pbuf: pbuf_free and pbuf_header handle such a
+ a pbuf differently */
+#define PBUF_FLAG_IS_CUSTOM 0x02U
+/** indicates this pbuf is UDP multicast to be looped back */
+#define PBUF_FLAG_MCASTLOOP 0x04U
+
+struct pbuf {
+ /** next pbuf in singly linked pbuf chain */
+ struct pbuf *next;
+
+ /** pointer to the actual data in the buffer */
+ void *payload;
+
+ /**
+ * total length of this buffer and all next buffers in chain
+ * belonging to the same packet.
+ *
+ * For non-queue packet chains this is the invariant:
+ * p->tot_len == p->len + (p->next? p->next->tot_len: 0)
+ */
+ u16_t tot_len;
+
+ /** length of this buffer */
+ u16_t len;
+
+ /** pbuf_type as u8_t instead of enum to save space */
+ u8_t /*pbuf_type*/ type;
+
+ /** misc flags */
+ u8_t flags;
+
+ /**
+ * the reference count always equals the number of pointers
+ * that refer to this pbuf. This can be pointers from an application,
+ * the stack itself, or pbuf->next pointers from a chain.
+ */
+ u16_t ref;
+};
+
+#if LWIP_SUPPORT_CUSTOM_PBUF
+/** Prototype for a function to free a custom pbuf */
+typedef void (*pbuf_free_custom_fn)(struct pbuf *p);
+
+/** A custom pbuf: like a pbuf, but following a function pointer to free it. */
+struct pbuf_custom {
+ /** The actual pbuf */
+ struct pbuf pbuf;
+ /** This function is called when pbuf_free deallocates this pbuf(_custom) */
+ pbuf_free_custom_fn custom_free_function;
+};
+#endif /* LWIP_SUPPORT_CUSTOM_PBUF */
+
+/* Initializes the pbuf module. This call is empty for now, but may not be in future. */
+#define pbuf_init()
+
+struct pbuf *pbuf_alloc(pbuf_layer l, u16_t length, pbuf_type type);
+#if LWIP_SUPPORT_CUSTOM_PBUF
+struct pbuf *pbuf_alloced_custom(pbuf_layer l, u16_t length, pbuf_type type,
+ struct pbuf_custom *p, void *payload_mem,
+ u16_t payload_mem_len);
+#endif /* LWIP_SUPPORT_CUSTOM_PBUF */
+void pbuf_realloc(struct pbuf *p, u16_t size);
+u8_t pbuf_header(struct pbuf *p, s16_t header_size);
+void pbuf_ref(struct pbuf *p);
+u8_t pbuf_free(struct pbuf *p);
+u8_t pbuf_clen(struct pbuf *p);
+void pbuf_cat(struct pbuf *head, struct pbuf *tail);
+void pbuf_chain(struct pbuf *head, struct pbuf *tail);
+struct pbuf *pbuf_dechain(struct pbuf *p);
+err_t pbuf_copy(struct pbuf *p_to, struct pbuf *p_from);
+u16_t pbuf_copy_partial(struct pbuf *p, void *dataptr, u16_t len, u16_t offset);
+err_t pbuf_take(struct pbuf *buf, const void *dataptr, u16_t len);
+struct pbuf *pbuf_coalesce(struct pbuf *p, pbuf_layer layer);
+#if LWIP_CHECKSUM_ON_COPY
+err_t pbuf_fill_chksum(struct pbuf *p, u16_t start_offset, const void *dataptr,
+ u16_t len, u16_t *chksum);
+#endif /* LWIP_CHECKSUM_ON_COPY */
+
+u8_t pbuf_get_at(struct pbuf* p, u16_t offset);
+u16_t pbuf_memcmp(struct pbuf* p, u16_t offset, const void* s2, u16_t n);
+u16_t pbuf_memfind(struct pbuf* p, const void* mem, u16_t mem_len, u16_t start_offset);
+u16_t pbuf_strstr(struct pbuf* p, const char* substr);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LWIP_PBUF_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_RAW_H__
+#define __LWIP_RAW_H__
+
+#include "lwip/opt.h"
+
+#if LWIP_RAW /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/pbuf.h"
+#include "lwip/def.h"
+#include "lwip/ip.h"
+#include "lwip/ip_addr.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct raw_pcb;
+
+/** Function prototype for raw pcb receive callback functions.
+ * @param arg user supplied argument (raw_pcb.recv_arg)
+ * @param pcb the raw_pcb which received data
+ * @param p the packet buffer that was received
+ * @param addr the remote IP address from which the packet was received
+ * @return 1 if the packet was 'eaten' (aka. deleted),
+ * 0 if the packet lives on
+ * If returning 1, the callback is responsible for freeing the pbuf
+ * if it's not used any more.
+ */
+typedef u8_t (*raw_recv_fn)(void *arg, struct raw_pcb *pcb, struct pbuf *p,
+ ip_addr_t *addr);
+
+struct raw_pcb {
+ /* Common members of all PCB types */
+ IP_PCB;
+
+ struct raw_pcb *next;
+
+ u8_t protocol;
+
+ /** receive callback function */
+ raw_recv_fn recv;
+ /* user-supplied argument for the recv callback */
+ void *recv_arg;
+};
+
+/* The following functions is the application layer interface to the
+ RAW code. */
+struct raw_pcb * raw_new (u8_t proto);
+void raw_remove (struct raw_pcb *pcb);
+err_t raw_bind (struct raw_pcb *pcb, ip_addr_t *ipaddr);
+err_t raw_connect (struct raw_pcb *pcb, ip_addr_t *ipaddr);
+
+void raw_recv (struct raw_pcb *pcb, raw_recv_fn recv, void *recv_arg);
+err_t raw_sendto (struct raw_pcb *pcb, struct pbuf *p, ip_addr_t *ipaddr);
+err_t raw_send (struct raw_pcb *pcb, struct pbuf *p);
+
+/* The following functions are the lower layer interface to RAW. */
+u8_t raw_input (struct pbuf *p, struct netif *inp);
+#define raw_init() /* Compatibility define, not init needed. */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_RAW */
+
+#endif /* __LWIP_RAW_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ */
+
+/*
+ * This is the interface to the platform specific serial IO module
+ * It needs to be implemented by those platforms which need SLIP or PPP
+ */
+
+#ifndef __SIO_H__
+#define __SIO_H__
+
+#include "lwip/arch.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* If you want to define sio_fd_t elsewhere or differently,
+ define this in your cc.h file. */
+#ifndef __sio_fd_t_defined
+typedef void * sio_fd_t;
+#endif
+
+/* The following functions can be defined to something else in your cc.h file
+ or be implemented in your custom sio.c file. */
+
+#ifndef sio_open
+/**
+ * Opens a serial device for communication.
+ *
+ * @param devnum device number
+ * @return handle to serial device if successful, NULL otherwise
+ */
+sio_fd_t sio_open(u8_t devnum);
+#endif
+
+#ifndef sio_send
+/**
+ * Sends a single character to the serial device.
+ *
+ * @param c character to send
+ * @param fd serial device handle
+ *
+ * @note This function will block until the character can be sent.
+ */
+void sio_send(u8_t c, sio_fd_t fd);
+#endif
+
+#ifndef sio_recv
+/**
+ * Receives a single character from the serial device.
+ *
+ * @param fd serial device handle
+ *
+ * @note This function will block until a character is received.
+ */
+u8_t sio_recv(sio_fd_t fd);
+#endif
+
+#ifndef sio_read
+/**
+ * Reads from the serial device.
+ *
+ * @param fd serial device handle
+ * @param data pointer to data buffer for receiving
+ * @param len maximum length (in bytes) of data to receive
+ * @return number of bytes actually received - may be 0 if aborted by sio_read_abort
+ *
+ * @note This function will block until data can be received. The blocking
+ * can be cancelled by calling sio_read_abort().
+ */
+u32_t sio_read(sio_fd_t fd, u8_t *data, u32_t len);
+#endif
+
+#ifndef sio_tryread
+/**
+ * Tries to read from the serial device. Same as sio_read but returns
+ * immediately if no data is available and never blocks.
+ *
+ * @param fd serial device handle
+ * @param data pointer to data buffer for receiving
+ * @param len maximum length (in bytes) of data to receive
+ * @return number of bytes actually received
+ */
+u32_t sio_tryread(sio_fd_t fd, u8_t *data, u32_t len);
+#endif
+
+#ifndef sio_write
+/**
+ * Writes to the serial device.
+ *
+ * @param fd serial device handle
+ * @param data pointer to data to send
+ * @param len length (in bytes) of data to send
+ * @return number of bytes actually sent
+ *
+ * @note This function will block until all data can be sent.
+ */
+u32_t sio_write(sio_fd_t fd, u8_t *data, u32_t len);
+#endif
+
+#ifndef sio_read_abort
+/**
+ * Aborts a blocking sio_read() call.
+ *
+ * @param fd serial device handle
+ */
+void sio_read_abort(sio_fd_t fd);
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __SIO_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001, 2002 Leon Woestenberg <leon.woestenberg@axon.tv>
+ * Copyright (c) 2001, 2002 Axon Digital Design B.V., The Netherlands.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Leon Woestenberg <leon.woestenberg@axon.tv>
+ *
+ */
+#ifndef __LWIP_SNMP_H__
+#define __LWIP_SNMP_H__
+
+#include "lwip/opt.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "lwip/ip_addr.h"
+
+struct udp_pcb;
+struct netif;
+
+/**
+ * @see RFC1213, "MIB-II, 6. Definitions"
+ */
+enum snmp_ifType {
+ snmp_ifType_other=1, /* none of the following */
+ snmp_ifType_regular1822,
+ snmp_ifType_hdh1822,
+ snmp_ifType_ddn_x25,
+ snmp_ifType_rfc877_x25,
+ snmp_ifType_ethernet_csmacd,
+ snmp_ifType_iso88023_csmacd,
+ snmp_ifType_iso88024_tokenBus,
+ snmp_ifType_iso88025_tokenRing,
+ snmp_ifType_iso88026_man,
+ snmp_ifType_starLan,
+ snmp_ifType_proteon_10Mbit,
+ snmp_ifType_proteon_80Mbit,
+ snmp_ifType_hyperchannel,
+ snmp_ifType_fddi,
+ snmp_ifType_lapb,
+ snmp_ifType_sdlc,
+ snmp_ifType_ds1, /* T-1 */
+ snmp_ifType_e1, /* european equiv. of T-1 */
+ snmp_ifType_basicISDN,
+ snmp_ifType_primaryISDN, /* proprietary serial */
+ snmp_ifType_propPointToPointSerial,
+ snmp_ifType_ppp,
+ snmp_ifType_softwareLoopback,
+ snmp_ifType_eon, /* CLNP over IP [11] */
+ snmp_ifType_ethernet_3Mbit,
+ snmp_ifType_nsip, /* XNS over IP */
+ snmp_ifType_slip, /* generic SLIP */
+ snmp_ifType_ultra, /* ULTRA technologies */
+ snmp_ifType_ds3, /* T-3 */
+ snmp_ifType_sip, /* SMDS */
+ snmp_ifType_frame_relay
+};
+
+#if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
+
+/** SNMP "sysuptime" Interval */
+#define SNMP_SYSUPTIME_INTERVAL 10
+
+/** fixed maximum length for object identifier type */
+#define LWIP_SNMP_OBJ_ID_LEN 32
+
+/** internal object identifier representation */
+struct snmp_obj_id
+{
+ u8_t len;
+ s32_t id[LWIP_SNMP_OBJ_ID_LEN];
+};
+
+/* system */
+void snmp_set_sysdesr(u8_t* str, u8_t* len);
+void snmp_set_sysobjid(struct snmp_obj_id *oid);
+void snmp_get_sysobjid_ptr(struct snmp_obj_id **oid);
+void snmp_inc_sysuptime(void);
+void snmp_add_sysuptime(u32_t value);
+void snmp_get_sysuptime(u32_t *value);
+void snmp_set_syscontact(u8_t *ocstr, u8_t *ocstrlen);
+void snmp_set_sysname(u8_t *ocstr, u8_t *ocstrlen);
+void snmp_set_syslocation(u8_t *ocstr, u8_t *ocstrlen);
+
+/* network interface */
+void snmp_add_ifinoctets(struct netif *ni, u32_t value);
+void snmp_inc_ifinucastpkts(struct netif *ni);
+void snmp_inc_ifinnucastpkts(struct netif *ni);
+void snmp_inc_ifindiscards(struct netif *ni);
+void snmp_add_ifoutoctets(struct netif *ni, u32_t value);
+void snmp_inc_ifoutucastpkts(struct netif *ni);
+void snmp_inc_ifoutnucastpkts(struct netif *ni);
+void snmp_inc_ifoutdiscards(struct netif *ni);
+void snmp_inc_iflist(void);
+void snmp_dec_iflist(void);
+
+/* ARP (for atTable and ipNetToMediaTable) */
+void snmp_insert_arpidx_tree(struct netif *ni, ip_addr_t *ip);
+void snmp_delete_arpidx_tree(struct netif *ni, ip_addr_t *ip);
+
+/* IP */
+void snmp_inc_ipinreceives(void);
+void snmp_inc_ipinhdrerrors(void);
+void snmp_inc_ipinaddrerrors(void);
+void snmp_inc_ipforwdatagrams(void);
+void snmp_inc_ipinunknownprotos(void);
+void snmp_inc_ipindiscards(void);
+void snmp_inc_ipindelivers(void);
+void snmp_inc_ipoutrequests(void);
+void snmp_inc_ipoutdiscards(void);
+void snmp_inc_ipoutnoroutes(void);
+void snmp_inc_ipreasmreqds(void);
+void snmp_inc_ipreasmoks(void);
+void snmp_inc_ipreasmfails(void);
+void snmp_inc_ipfragoks(void);
+void snmp_inc_ipfragfails(void);
+void snmp_inc_ipfragcreates(void);
+void snmp_inc_iproutingdiscards(void);
+void snmp_insert_ipaddridx_tree(struct netif *ni);
+void snmp_delete_ipaddridx_tree(struct netif *ni);
+void snmp_insert_iprteidx_tree(u8_t dflt, struct netif *ni);
+void snmp_delete_iprteidx_tree(u8_t dflt, struct netif *ni);
+
+/* ICMP */
+void snmp_inc_icmpinmsgs(void);
+void snmp_inc_icmpinerrors(void);
+void snmp_inc_icmpindestunreachs(void);
+void snmp_inc_icmpintimeexcds(void);
+void snmp_inc_icmpinparmprobs(void);
+void snmp_inc_icmpinsrcquenchs(void);
+void snmp_inc_icmpinredirects(void);
+void snmp_inc_icmpinechos(void);
+void snmp_inc_icmpinechoreps(void);
+void snmp_inc_icmpintimestamps(void);
+void snmp_inc_icmpintimestampreps(void);
+void snmp_inc_icmpinaddrmasks(void);
+void snmp_inc_icmpinaddrmaskreps(void);
+void snmp_inc_icmpoutmsgs(void);
+void snmp_inc_icmpouterrors(void);
+void snmp_inc_icmpoutdestunreachs(void);
+void snmp_inc_icmpouttimeexcds(void);
+void snmp_inc_icmpoutparmprobs(void);
+void snmp_inc_icmpoutsrcquenchs(void);
+void snmp_inc_icmpoutredirects(void);
+void snmp_inc_icmpoutechos(void);
+void snmp_inc_icmpoutechoreps(void);
+void snmp_inc_icmpouttimestamps(void);
+void snmp_inc_icmpouttimestampreps(void);
+void snmp_inc_icmpoutaddrmasks(void);
+void snmp_inc_icmpoutaddrmaskreps(void);
+
+/* TCP */
+void snmp_inc_tcpactiveopens(void);
+void snmp_inc_tcppassiveopens(void);
+void snmp_inc_tcpattemptfails(void);
+void snmp_inc_tcpestabresets(void);
+void snmp_inc_tcpinsegs(void);
+void snmp_inc_tcpoutsegs(void);
+void snmp_inc_tcpretranssegs(void);
+void snmp_inc_tcpinerrs(void);
+void snmp_inc_tcpoutrsts(void);
+
+/* UDP */
+void snmp_inc_udpindatagrams(void);
+void snmp_inc_udpnoports(void);
+void snmp_inc_udpinerrors(void);
+void snmp_inc_udpoutdatagrams(void);
+void snmp_insert_udpidx_tree(struct udp_pcb *pcb);
+void snmp_delete_udpidx_tree(struct udp_pcb *pcb);
+
+/* SNMP */
+void snmp_inc_snmpinpkts(void);
+void snmp_inc_snmpoutpkts(void);
+void snmp_inc_snmpinbadversions(void);
+void snmp_inc_snmpinbadcommunitynames(void);
+void snmp_inc_snmpinbadcommunityuses(void);
+void snmp_inc_snmpinasnparseerrs(void);
+void snmp_inc_snmpintoobigs(void);
+void snmp_inc_snmpinnosuchnames(void);
+void snmp_inc_snmpinbadvalues(void);
+void snmp_inc_snmpinreadonlys(void);
+void snmp_inc_snmpingenerrs(void);
+void snmp_add_snmpintotalreqvars(u8_t value);
+void snmp_add_snmpintotalsetvars(u8_t value);
+void snmp_inc_snmpingetrequests(void);
+void snmp_inc_snmpingetnexts(void);
+void snmp_inc_snmpinsetrequests(void);
+void snmp_inc_snmpingetresponses(void);
+void snmp_inc_snmpintraps(void);
+void snmp_inc_snmpouttoobigs(void);
+void snmp_inc_snmpoutnosuchnames(void);
+void snmp_inc_snmpoutbadvalues(void);
+void snmp_inc_snmpoutgenerrs(void);
+void snmp_inc_snmpoutgetrequests(void);
+void snmp_inc_snmpoutgetnexts(void);
+void snmp_inc_snmpoutsetrequests(void);
+void snmp_inc_snmpoutgetresponses(void);
+void snmp_inc_snmpouttraps(void);
+void snmp_get_snmpgrpid_ptr(struct snmp_obj_id **oid);
+void snmp_set_snmpenableauthentraps(u8_t *value);
+void snmp_get_snmpenableauthentraps(u8_t *value);
+
+/* LWIP_SNMP support not available */
+/* define everything to be empty */
+#else
+
+/* system */
+#define snmp_set_sysdesr(str, len)
+#define snmp_set_sysobjid(oid);
+#define snmp_get_sysobjid_ptr(oid)
+#define snmp_inc_sysuptime()
+#define snmp_add_sysuptime(value)
+#define snmp_get_sysuptime(value)
+#define snmp_set_syscontact(ocstr, ocstrlen);
+#define snmp_set_sysname(ocstr, ocstrlen);
+#define snmp_set_syslocation(ocstr, ocstrlen);
+
+/* network interface */
+#define snmp_add_ifinoctets(ni,value)
+#define snmp_inc_ifinucastpkts(ni)
+#define snmp_inc_ifinnucastpkts(ni)
+#define snmp_inc_ifindiscards(ni)
+#define snmp_add_ifoutoctets(ni,value)
+#define snmp_inc_ifoutucastpkts(ni)
+#define snmp_inc_ifoutnucastpkts(ni)
+#define snmp_inc_ifoutdiscards(ni)
+#define snmp_inc_iflist()
+#define snmp_dec_iflist()
+
+/* ARP */
+#define snmp_insert_arpidx_tree(ni,ip)
+#define snmp_delete_arpidx_tree(ni,ip)
+
+/* IP */
+#define snmp_inc_ipinreceives()
+#define snmp_inc_ipinhdrerrors()
+#define snmp_inc_ipinaddrerrors()
+#define snmp_inc_ipforwdatagrams()
+#define snmp_inc_ipinunknownprotos()
+#define snmp_inc_ipindiscards()
+#define snmp_inc_ipindelivers()
+#define snmp_inc_ipoutrequests()
+#define snmp_inc_ipoutdiscards()
+#define snmp_inc_ipoutnoroutes()
+#define snmp_inc_ipreasmreqds()
+#define snmp_inc_ipreasmoks()
+#define snmp_inc_ipreasmfails()
+#define snmp_inc_ipfragoks()
+#define snmp_inc_ipfragfails()
+#define snmp_inc_ipfragcreates()
+#define snmp_inc_iproutingdiscards()
+#define snmp_insert_ipaddridx_tree(ni)
+#define snmp_delete_ipaddridx_tree(ni)
+#define snmp_insert_iprteidx_tree(dflt, ni)
+#define snmp_delete_iprteidx_tree(dflt, ni)
+
+/* ICMP */
+#define snmp_inc_icmpinmsgs()
+#define snmp_inc_icmpinerrors()
+#define snmp_inc_icmpindestunreachs()
+#define snmp_inc_icmpintimeexcds()
+#define snmp_inc_icmpinparmprobs()
+#define snmp_inc_icmpinsrcquenchs()
+#define snmp_inc_icmpinredirects()
+#define snmp_inc_icmpinechos()
+#define snmp_inc_icmpinechoreps()
+#define snmp_inc_icmpintimestamps()
+#define snmp_inc_icmpintimestampreps()
+#define snmp_inc_icmpinaddrmasks()
+#define snmp_inc_icmpinaddrmaskreps()
+#define snmp_inc_icmpoutmsgs()
+#define snmp_inc_icmpouterrors()
+#define snmp_inc_icmpoutdestunreachs()
+#define snmp_inc_icmpouttimeexcds()
+#define snmp_inc_icmpoutparmprobs()
+#define snmp_inc_icmpoutsrcquenchs()
+#define snmp_inc_icmpoutredirects()
+#define snmp_inc_icmpoutechos()
+#define snmp_inc_icmpoutechoreps()
+#define snmp_inc_icmpouttimestamps()
+#define snmp_inc_icmpouttimestampreps()
+#define snmp_inc_icmpoutaddrmasks()
+#define snmp_inc_icmpoutaddrmaskreps()
+/* TCP */
+#define snmp_inc_tcpactiveopens()
+#define snmp_inc_tcppassiveopens()
+#define snmp_inc_tcpattemptfails()
+#define snmp_inc_tcpestabresets()
+#define snmp_inc_tcpinsegs()
+#define snmp_inc_tcpoutsegs()
+#define snmp_inc_tcpretranssegs()
+#define snmp_inc_tcpinerrs()
+#define snmp_inc_tcpoutrsts()
+
+/* UDP */
+#define snmp_inc_udpindatagrams()
+#define snmp_inc_udpnoports()
+#define snmp_inc_udpinerrors()
+#define snmp_inc_udpoutdatagrams()
+#define snmp_insert_udpidx_tree(pcb)
+#define snmp_delete_udpidx_tree(pcb)
+
+/* SNMP */
+#define snmp_inc_snmpinpkts()
+#define snmp_inc_snmpoutpkts()
+#define snmp_inc_snmpinbadversions()
+#define snmp_inc_snmpinbadcommunitynames()
+#define snmp_inc_snmpinbadcommunityuses()
+#define snmp_inc_snmpinasnparseerrs()
+#define snmp_inc_snmpintoobigs()
+#define snmp_inc_snmpinnosuchnames()
+#define snmp_inc_snmpinbadvalues()
+#define snmp_inc_snmpinreadonlys()
+#define snmp_inc_snmpingenerrs()
+#define snmp_add_snmpintotalreqvars(value)
+#define snmp_add_snmpintotalsetvars(value)
+#define snmp_inc_snmpingetrequests()
+#define snmp_inc_snmpingetnexts()
+#define snmp_inc_snmpinsetrequests()
+#define snmp_inc_snmpingetresponses()
+#define snmp_inc_snmpintraps()
+#define snmp_inc_snmpouttoobigs()
+#define snmp_inc_snmpoutnosuchnames()
+#define snmp_inc_snmpoutbadvalues()
+#define snmp_inc_snmpoutgenerrs()
+#define snmp_inc_snmpoutgetrequests()
+#define snmp_inc_snmpoutgetnexts()
+#define snmp_inc_snmpoutsetrequests()
+#define snmp_inc_snmpoutgetresponses()
+#define snmp_inc_snmpouttraps()
+#define snmp_get_snmpgrpid_ptr(oid)
+#define snmp_set_snmpenableauthentraps(value)
+#define snmp_get_snmpenableauthentraps(value)
+
+#endif /* LWIP_SNMP */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LWIP_SNMP_H__ */
--- /dev/null
+/**
+ * @file
+ * Abstract Syntax Notation One (ISO 8824, 8825) codec.
+ */
+
+/*
+ * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * Author: Christiaan Simons <christiaan.simons@axon.tv>
+ */
+
+#ifndef __LWIP_SNMP_ASN1_H__
+#define __LWIP_SNMP_ASN1_H__
+
+#include "lwip/opt.h"
+#include "lwip/err.h"
+#include "lwip/pbuf.h"
+#include "lwip/snmp.h"
+
+#if LWIP_SNMP
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define SNMP_ASN1_UNIV (0) /* (!0x80 | !0x40) */
+#define SNMP_ASN1_APPLIC (0x40) /* (!0x80 | 0x40) */
+#define SNMP_ASN1_CONTXT (0x80) /* ( 0x80 | !0x40) */
+
+#define SNMP_ASN1_CONSTR (0x20) /* ( 0x20) */
+#define SNMP_ASN1_PRIMIT (0) /* (!0x20) */
+
+/* universal tags */
+#define SNMP_ASN1_INTEG 2
+#define SNMP_ASN1_OC_STR 4
+#define SNMP_ASN1_NUL 5
+#define SNMP_ASN1_OBJ_ID 6
+#define SNMP_ASN1_SEQ 16
+
+/* application specific (SNMP) tags */
+#define SNMP_ASN1_IPADDR 0 /* octet string size(4) */
+#define SNMP_ASN1_COUNTER 1 /* u32_t */
+#define SNMP_ASN1_GAUGE 2 /* u32_t */
+#define SNMP_ASN1_TIMETICKS 3 /* u32_t */
+#define SNMP_ASN1_OPAQUE 4 /* octet string */
+
+/* context specific (SNMP) tags */
+#define SNMP_ASN1_PDU_GET_REQ 0
+#define SNMP_ASN1_PDU_GET_NEXT_REQ 1
+#define SNMP_ASN1_PDU_GET_RESP 2
+#define SNMP_ASN1_PDU_SET_REQ 3
+#define SNMP_ASN1_PDU_TRAP 4
+
+err_t snmp_asn1_dec_type(struct pbuf *p, u16_t ofs, u8_t *type);
+err_t snmp_asn1_dec_length(struct pbuf *p, u16_t ofs, u8_t *octets_used, u16_t *length);
+err_t snmp_asn1_dec_u32t(struct pbuf *p, u16_t ofs, u16_t len, u32_t *value);
+err_t snmp_asn1_dec_s32t(struct pbuf *p, u16_t ofs, u16_t len, s32_t *value);
+err_t snmp_asn1_dec_oid(struct pbuf *p, u16_t ofs, u16_t len, struct snmp_obj_id *oid);
+err_t snmp_asn1_dec_raw(struct pbuf *p, u16_t ofs, u16_t len, u16_t raw_len, u8_t *raw);
+
+void snmp_asn1_enc_length_cnt(u16_t length, u8_t *octets_needed);
+void snmp_asn1_enc_u32t_cnt(u32_t value, u16_t *octets_needed);
+void snmp_asn1_enc_s32t_cnt(s32_t value, u16_t *octets_needed);
+void snmp_asn1_enc_oid_cnt(u8_t ident_len, s32_t *ident, u16_t *octets_needed);
+err_t snmp_asn1_enc_type(struct pbuf *p, u16_t ofs, u8_t type);
+err_t snmp_asn1_enc_length(struct pbuf *p, u16_t ofs, u16_t length);
+err_t snmp_asn1_enc_u32t(struct pbuf *p, u16_t ofs, u16_t octets_needed, u32_t value);
+err_t snmp_asn1_enc_s32t(struct pbuf *p, u16_t ofs, u16_t octets_needed, s32_t value);
+err_t snmp_asn1_enc_oid(struct pbuf *p, u16_t ofs, u8_t ident_len, s32_t *ident);
+err_t snmp_asn1_enc_raw(struct pbuf *p, u16_t ofs, u16_t raw_len, u8_t *raw);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_SNMP */
+
+#endif /* __LWIP_SNMP_ASN1_H__ */
--- /dev/null
+/**
+ * @file
+ * SNMP Agent message handling structures.
+ */
+
+/*
+ * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * Author: Christiaan Simons <christiaan.simons@axon.tv>
+ */
+
+#ifndef __LWIP_SNMP_MSG_H__
+#define __LWIP_SNMP_MSG_H__
+
+#include "lwip/opt.h"
+#include "lwip/snmp.h"
+#include "lwip/snmp_structs.h"
+#include "lwip/ip_addr.h"
+#include "lwip/err.h"
+
+#if LWIP_SNMP
+
+#if SNMP_PRIVATE_MIB
+/* When using a private MIB, you have to create a file 'private_mib.h' that contains
+ * a 'struct mib_array_node mib_private' which contains your MIB. */
+#include "private_mib.h"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* The listen port of the SNMP agent. Clients have to make their requests to
+ this port. Most standard clients won't work if you change this! */
+#ifndef SNMP_IN_PORT
+#define SNMP_IN_PORT 161
+#endif
+/* The remote port the SNMP agent sends traps to. Most standard trap sinks won't
+ work if you change this! */
+#ifndef SNMP_TRAP_PORT
+#define SNMP_TRAP_PORT 162
+#endif
+
+#define SNMP_ES_NOERROR 0
+#define SNMP_ES_TOOBIG 1
+#define SNMP_ES_NOSUCHNAME 2
+#define SNMP_ES_BADVALUE 3
+#define SNMP_ES_READONLY 4
+#define SNMP_ES_GENERROR 5
+
+#define SNMP_GENTRAP_COLDSTART 0
+#define SNMP_GENTRAP_WARMSTART 1
+#define SNMP_GENTRAP_AUTHFAIL 4
+#define SNMP_GENTRAP_ENTERPRISESPC 6
+
+struct snmp_varbind
+{
+ /* next pointer, NULL for last in list */
+ struct snmp_varbind *next;
+ /* previous pointer, NULL for first in list */
+ struct snmp_varbind *prev;
+
+ /* object identifier length (in s32_t) */
+ u8_t ident_len;
+ /* object identifier array */
+ s32_t *ident;
+
+ /* object value ASN1 type */
+ u8_t value_type;
+ /* object value length (in u8_t) */
+ u8_t value_len;
+ /* object value */
+ void *value;
+
+ /* encoding varbind seq length length */
+ u8_t seqlenlen;
+ /* encoding object identifier length length */
+ u8_t olenlen;
+ /* encoding object value length length */
+ u8_t vlenlen;
+ /* encoding varbind seq length */
+ u16_t seqlen;
+ /* encoding object identifier length */
+ u16_t olen;
+ /* encoding object value length */
+ u16_t vlen;
+};
+
+struct snmp_varbind_root
+{
+ struct snmp_varbind *head;
+ struct snmp_varbind *tail;
+ /* number of variable bindings in list */
+ u8_t count;
+ /* encoding varbind-list seq length length */
+ u8_t seqlenlen;
+ /* encoding varbind-list seq length */
+ u16_t seqlen;
+};
+
+/** output response message header length fields */
+struct snmp_resp_header_lengths
+{
+ /* encoding error-index length length */
+ u8_t erridxlenlen;
+ /* encoding error-status length length */
+ u8_t errstatlenlen;
+ /* encoding request id length length */
+ u8_t ridlenlen;
+ /* encoding pdu length length */
+ u8_t pdulenlen;
+ /* encoding community length length */
+ u8_t comlenlen;
+ /* encoding version length length */
+ u8_t verlenlen;
+ /* encoding sequence length length */
+ u8_t seqlenlen;
+
+ /* encoding error-index length */
+ u16_t erridxlen;
+ /* encoding error-status length */
+ u16_t errstatlen;
+ /* encoding request id length */
+ u16_t ridlen;
+ /* encoding pdu length */
+ u16_t pdulen;
+ /* encoding community length */
+ u16_t comlen;
+ /* encoding version length */
+ u16_t verlen;
+ /* encoding sequence length */
+ u16_t seqlen;
+};
+
+/** output response message header length fields */
+struct snmp_trap_header_lengths
+{
+ /* encoding timestamp length length */
+ u8_t tslenlen;
+ /* encoding specific-trap length length */
+ u8_t strplenlen;
+ /* encoding generic-trap length length */
+ u8_t gtrplenlen;
+ /* encoding agent-addr length length */
+ u8_t aaddrlenlen;
+ /* encoding enterprise-id length length */
+ u8_t eidlenlen;
+ /* encoding pdu length length */
+ u8_t pdulenlen;
+ /* encoding community length length */
+ u8_t comlenlen;
+ /* encoding version length length */
+ u8_t verlenlen;
+ /* encoding sequence length length */
+ u8_t seqlenlen;
+
+ /* encoding timestamp length */
+ u16_t tslen;
+ /* encoding specific-trap length */
+ u16_t strplen;
+ /* encoding generic-trap length */
+ u16_t gtrplen;
+ /* encoding agent-addr length */
+ u16_t aaddrlen;
+ /* encoding enterprise-id length */
+ u16_t eidlen;
+ /* encoding pdu length */
+ u16_t pdulen;
+ /* encoding community length */
+ u16_t comlen;
+ /* encoding version length */
+ u16_t verlen;
+ /* encoding sequence length */
+ u16_t seqlen;
+};
+
+/* Accepting new SNMP messages. */
+#define SNMP_MSG_EMPTY 0
+/* Search for matching object for variable binding. */
+#define SNMP_MSG_SEARCH_OBJ 1
+/* Perform SNMP operation on in-memory object.
+ Pass-through states, for symmetry only. */
+#define SNMP_MSG_INTERNAL_GET_OBJDEF 2
+#define SNMP_MSG_INTERNAL_GET_VALUE 3
+#define SNMP_MSG_INTERNAL_SET_TEST 4
+#define SNMP_MSG_INTERNAL_GET_OBJDEF_S 5
+#define SNMP_MSG_INTERNAL_SET_VALUE 6
+/* Perform SNMP operation on object located externally.
+ In theory this could be used for building a proxy agent.
+ Practical use is for an enterprise spc. app. gateway. */
+#define SNMP_MSG_EXTERNAL_GET_OBJDEF 7
+#define SNMP_MSG_EXTERNAL_GET_VALUE 8
+#define SNMP_MSG_EXTERNAL_SET_TEST 9
+#define SNMP_MSG_EXTERNAL_GET_OBJDEF_S 10
+#define SNMP_MSG_EXTERNAL_SET_VALUE 11
+
+#define SNMP_COMMUNITY_STR_LEN 64
+struct snmp_msg_pstat
+{
+ /* lwIP local port (161) binding */
+ struct udp_pcb *pcb;
+ /* source IP address */
+ ip_addr_t sip;
+ /* source UDP port */
+ u16_t sp;
+ /* request type */
+ u8_t rt;
+ /* request ID */
+ s32_t rid;
+ /* error status */
+ s32_t error_status;
+ /* error index */
+ s32_t error_index;
+ /* community name (zero terminated) */
+ u8_t community[SNMP_COMMUNITY_STR_LEN + 1];
+ /* community string length (exclusive zero term) */
+ u8_t com_strlen;
+ /* one out of MSG_EMPTY, MSG_DEMUX, MSG_INTERNAL, MSG_EXTERNAL_x */
+ u8_t state;
+ /* saved arguments for MSG_EXTERNAL_x */
+ struct mib_external_node *ext_mib_node;
+ struct snmp_name_ptr ext_name_ptr;
+ struct obj_def ext_object_def;
+ struct snmp_obj_id ext_oid;
+ /* index into input variable binding list */
+ u8_t vb_idx;
+ /* ptr into input variable binding list */
+ struct snmp_varbind *vb_ptr;
+ /* list of variable bindings from input */
+ struct snmp_varbind_root invb;
+ /* list of variable bindings to output */
+ struct snmp_varbind_root outvb;
+ /* output response lengths used in ASN encoding */
+ struct snmp_resp_header_lengths rhl;
+};
+
+struct snmp_msg_trap
+{
+ /* lwIP local port (161) binding */
+ struct udp_pcb *pcb;
+ /* destination IP address in network order */
+ ip_addr_t dip;
+
+ /* source enterprise ID (sysObjectID) */
+ struct snmp_obj_id *enterprise;
+ /* source IP address, raw network order format */
+ u8_t sip_raw[4];
+ /* generic trap code */
+ u32_t gen_trap;
+ /* specific trap code */
+ u32_t spc_trap;
+ /* timestamp */
+ u32_t ts;
+ /* list of variable bindings to output */
+ struct snmp_varbind_root outvb;
+ /* output trap lengths used in ASN encoding */
+ struct snmp_trap_header_lengths thl;
+};
+
+/** Agent Version constant, 0 = v1 oddity */
+extern const s32_t snmp_version;
+/** Agent default "public" community string */
+extern const char snmp_publiccommunity[7];
+
+extern struct snmp_msg_trap trap_msg;
+
+/** Agent setup, start listening to port 161. */
+void snmp_init(void);
+void snmp_trap_dst_enable(u8_t dst_idx, u8_t enable);
+void snmp_trap_dst_ip_set(u8_t dst_idx, ip_addr_t *dst);
+
+/** Varbind-list functions. */
+struct snmp_varbind* snmp_varbind_alloc(struct snmp_obj_id *oid, u8_t type, u8_t len);
+void snmp_varbind_free(struct snmp_varbind *vb);
+void snmp_varbind_list_free(struct snmp_varbind_root *root);
+void snmp_varbind_tail_add(struct snmp_varbind_root *root, struct snmp_varbind *vb);
+struct snmp_varbind* snmp_varbind_tail_remove(struct snmp_varbind_root *root);
+
+/** Handle an internal (recv) or external (private response) event. */
+void snmp_msg_event(u8_t request_id);
+err_t snmp_send_response(struct snmp_msg_pstat *m_stat);
+err_t snmp_send_trap(s8_t generic_trap, struct snmp_obj_id *eoid, s32_t specific_trap);
+void snmp_coldstart_trap(void);
+void snmp_authfail_trap(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_SNMP */
+
+#endif /* __LWIP_SNMP_MSG_H__ */
--- /dev/null
+/**
+ * @file
+ * Generic MIB tree structures.
+ *
+ * @todo namespace prefixes
+ */
+
+/*
+ * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * Author: Christiaan Simons <christiaan.simons@axon.tv>
+ */
+
+#ifndef __LWIP_SNMP_STRUCTS_H__
+#define __LWIP_SNMP_STRUCTS_H__
+
+#include "lwip/opt.h"
+
+#if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/snmp.h"
+
+#if SNMP_PRIVATE_MIB
+/* When using a private MIB, you have to create a file 'private_mib.h' that contains
+ * a 'struct mib_array_node mib_private' which contains your MIB. */
+#include "private_mib.h"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* MIB object instance */
+#define MIB_OBJECT_NONE 0
+#define MIB_OBJECT_SCALAR 1
+#define MIB_OBJECT_TAB 2
+
+/* MIB access types */
+#define MIB_ACCESS_READ 1
+#define MIB_ACCESS_WRITE 2
+
+/* MIB object access */
+#define MIB_OBJECT_READ_ONLY MIB_ACCESS_READ
+#define MIB_OBJECT_READ_WRITE (MIB_ACCESS_READ | MIB_ACCESS_WRITE)
+#define MIB_OBJECT_WRITE_ONLY MIB_ACCESS_WRITE
+#define MIB_OBJECT_NOT_ACCESSIBLE 0
+
+/** object definition returned by (get_object_def)() */
+struct obj_def
+{
+ /* MIB_OBJECT_NONE (0), MIB_OBJECT_SCALAR (1), MIB_OBJECT_TAB (2) */
+ u8_t instance;
+ /* 0 read-only, 1 read-write, 2 write-only, 3 not-accessible */
+ u8_t access;
+ /* ASN type for this object */
+ u8_t asn_type;
+ /* value length (host length) */
+ u16_t v_len;
+ /* length of instance part of supplied object identifier */
+ u8_t id_inst_len;
+ /* instance part of supplied object identifier */
+ s32_t *id_inst_ptr;
+};
+
+struct snmp_name_ptr
+{
+ u8_t ident_len;
+ s32_t *ident;
+};
+
+/** MIB const scalar (.0) node */
+#define MIB_NODE_SC 0x01
+/** MIB const array node */
+#define MIB_NODE_AR 0x02
+/** MIB array node (mem_malloced from RAM) */
+#define MIB_NODE_RA 0x03
+/** MIB list root node (mem_malloced from RAM) */
+#define MIB_NODE_LR 0x04
+/** MIB node for external objects */
+#define MIB_NODE_EX 0x05
+
+/** node "base class" layout, the mandatory fields for a node */
+struct mib_node
+{
+ /** returns struct obj_def for the given object identifier */
+ void (*get_object_def)(u8_t ident_len, s32_t *ident, struct obj_def *od);
+ /** returns object value for the given object identifier,
+ @note the caller must allocate at least len bytes for the value */
+ void (*get_value)(struct obj_def *od, u16_t len, void *value);
+ /** tests length and/or range BEFORE setting */
+ u8_t (*set_test)(struct obj_def *od, u16_t len, void *value);
+ /** sets object value, only to be called when set_test() */
+ void (*set_value)(struct obj_def *od, u16_t len, void *value);
+ /** One out of MIB_NODE_AR, MIB_NODE_LR or MIB_NODE_EX */
+ u8_t node_type;
+ /* array or max list length */
+ u16_t maxlength;
+};
+
+/** derived node for scalars .0 index */
+typedef struct mib_node mib_scalar_node;
+
+/** derived node, points to a fixed size const array
+ of sub-identifiers plus a 'child' pointer */
+struct mib_array_node
+{
+ /* inherited "base class" members */
+ void (*get_object_def)(u8_t ident_len, s32_t *ident, struct obj_def *od);
+ void (*get_value)(struct obj_def *od, u16_t len, void *value);
+ u8_t (*set_test)(struct obj_def *od, u16_t len, void *value);
+ void (*set_value)(struct obj_def *od, u16_t len, void *value);
+
+ u8_t node_type;
+ u16_t maxlength;
+
+ /* additional struct members */
+ const s32_t *objid;
+ struct mib_node* const *nptr;
+};
+
+/** derived node, points to a fixed size mem_malloced array
+ of sub-identifiers plus a 'child' pointer */
+struct mib_ram_array_node
+{
+ /* inherited "base class" members */
+ void (*get_object_def)(u8_t ident_len, s32_t *ident, struct obj_def *od);
+ void (*get_value)(struct obj_def *od, u16_t len, void *value);
+ u8_t (*set_test)(struct obj_def *od, u16_t len, void *value);
+ void (*set_value)(struct obj_def *od, u16_t len, void *value);
+
+ u8_t node_type;
+ u16_t maxlength;
+
+ /* aditional struct members */
+ s32_t *objid;
+ struct mib_node **nptr;
+};
+
+struct mib_list_node
+{
+ struct mib_list_node *prev;
+ struct mib_list_node *next;
+ s32_t objid;
+ struct mib_node *nptr;
+};
+
+/** derived node, points to a doubly linked list
+ of sub-identifiers plus a 'child' pointer */
+struct mib_list_rootnode
+{
+ /* inherited "base class" members */
+ void (*get_object_def)(u8_t ident_len, s32_t *ident, struct obj_def *od);
+ void (*get_value)(struct obj_def *od, u16_t len, void *value);
+ u8_t (*set_test)(struct obj_def *od, u16_t len, void *value);
+ void (*set_value)(struct obj_def *od, u16_t len, void *value);
+
+ u8_t node_type;
+ u16_t maxlength;
+
+ /* additional struct members */
+ struct mib_list_node *head;
+ struct mib_list_node *tail;
+ /* counts list nodes in list */
+ u16_t count;
+};
+
+/** derived node, has access functions for mib object in external memory or device
+ using 'tree_level' and 'idx', with a range 0 .. (level_length() - 1) */
+struct mib_external_node
+{
+ /* inherited "base class" members */
+ void (*get_object_def)(u8_t ident_len, s32_t *ident, struct obj_def *od);
+ void (*get_value)(struct obj_def *od, u16_t len, void *value);
+ u8_t (*set_test)(struct obj_def *od, u16_t len, void *value);
+ void (*set_value)(struct obj_def *od, u16_t len, void *value);
+
+ u8_t node_type;
+ u16_t maxlength;
+
+ /* additional struct members */
+ /** points to an external (in memory) record of some sort of addressing
+ information, passed to and interpreted by the funtions below */
+ void* addr_inf;
+ /** tree levels under this node */
+ u8_t tree_levels;
+ /** number of objects at this level */
+ u16_t (*level_length)(void* addr_inf, u8_t level);
+ /** compares object sub identifier with external id
+ return zero when equal, nonzero when unequal */
+ s32_t (*ident_cmp)(void* addr_inf, u8_t level, u16_t idx, s32_t sub_id);
+ void (*get_objid)(void* addr_inf, u8_t level, u16_t idx, s32_t *sub_id);
+
+ /** async Questions */
+ void (*get_object_def_q)(void* addr_inf, u8_t rid, u8_t ident_len, s32_t *ident);
+ void (*get_value_q)(u8_t rid, struct obj_def *od);
+ void (*set_test_q)(u8_t rid, struct obj_def *od);
+ void (*set_value_q)(u8_t rid, struct obj_def *od, u16_t len, void *value);
+ /** async Answers */
+ void (*get_object_def_a)(u8_t rid, u8_t ident_len, s32_t *ident, struct obj_def *od);
+ void (*get_value_a)(u8_t rid, struct obj_def *od, u16_t len, void *value);
+ u8_t (*set_test_a)(u8_t rid, struct obj_def *od, u16_t len, void *value);
+ void (*set_value_a)(u8_t rid, struct obj_def *od, u16_t len, void *value);
+ /** async Panic Close (agent returns error reply,
+ e.g. used for external transaction cleanup) */
+ void (*get_object_def_pc)(u8_t rid, u8_t ident_len, s32_t *ident);
+ void (*get_value_pc)(u8_t rid, struct obj_def *od);
+ void (*set_test_pc)(u8_t rid, struct obj_def *od);
+ void (*set_value_pc)(u8_t rid, struct obj_def *od);
+};
+
+/** export MIB tree from mib2.c */
+extern const struct mib_array_node internet;
+
+/** dummy function pointers for non-leaf MIB nodes from mib2.c */
+void noleafs_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
+void noleafs_get_value(struct obj_def *od, u16_t len, void *value);
+u8_t noleafs_set_test(struct obj_def *od, u16_t len, void *value);
+void noleafs_set_value(struct obj_def *od, u16_t len, void *value);
+
+void snmp_oidtoip(s32_t *ident, ip_addr_t *ip);
+void snmp_iptooid(ip_addr_t *ip, s32_t *ident);
+void snmp_ifindextonetif(s32_t ifindex, struct netif **netif);
+void snmp_netiftoifindex(struct netif *netif, s32_t *ifidx);
+
+struct mib_list_node* snmp_mib_ln_alloc(s32_t id);
+void snmp_mib_ln_free(struct mib_list_node *ln);
+struct mib_list_rootnode* snmp_mib_lrn_alloc(void);
+void snmp_mib_lrn_free(struct mib_list_rootnode *lrn);
+
+s8_t snmp_mib_node_insert(struct mib_list_rootnode *rn, s32_t objid, struct mib_list_node **insn);
+s8_t snmp_mib_node_find(struct mib_list_rootnode *rn, s32_t objid, struct mib_list_node **fn);
+struct mib_list_rootnode *snmp_mib_node_delete(struct mib_list_rootnode *rn, struct mib_list_node *n);
+
+struct mib_node* snmp_search_tree(struct mib_node *node, u8_t ident_len, s32_t *ident, struct snmp_name_ptr *np);
+struct mib_node* snmp_expand_tree(struct mib_node *node, u8_t ident_len, s32_t *ident, struct snmp_obj_id *oidret);
+u8_t snmp_iso_prefix_tst(u8_t ident_len, s32_t *ident);
+u8_t snmp_iso_prefix_expand(u8_t ident_len, s32_t *ident, struct snmp_obj_id *oidret);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_SNMP */
+
+#endif /* __LWIP_SNMP_STRUCTS_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+
+#ifndef __LWIP_SOCKETS_H__
+#define __LWIP_SOCKETS_H__
+
+#include "lwip/opt.h"
+
+#if LWIP_SOCKET /* don't build if not configured for use in lwipopts.h */
+
+#include <stddef.h> /* for size_t */
+
+#include "lwip/ip_addr.h"
+#include "lwip/inet.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* members are in network byte order */
+struct sockaddr_in {
+ u8_t sin_len;
+ u8_t sin_family;
+ u16_t sin_port;
+ struct in_addr sin_addr;
+ char sin_zero[8];
+};
+
+struct sockaddr {
+ u8_t sa_len;
+ u8_t sa_family;
+ char sa_data[14];
+};
+
+#ifndef socklen_t
+# define socklen_t u32_t
+#endif
+
+/* Socket protocol types (TCP/UDP/RAW) */
+#define SOCK_STREAM 1
+#define SOCK_DGRAM 2
+#define SOCK_RAW 3
+
+/*
+ * Option flags per-socket. These must match the SOF_ flags in ip.h (checked in init.c)
+ */
+#define SO_DEBUG 0x0001 /* Unimplemented: turn on debugging info recording */
+#define SO_ACCEPTCONN 0x0002 /* socket has had listen() */
+#define SO_REUSEADDR 0x0004 /* Allow local address reuse */
+#define SO_KEEPALIVE 0x0008 /* keep connections alive */
+#define SO_DONTROUTE 0x0010 /* Unimplemented: just use interface addresses */
+#define SO_BROADCAST 0x0020 /* permit to send and to receive broadcast messages (see IP_SOF_BROADCAST option) */
+#define SO_USELOOPBACK 0x0040 /* Unimplemented: bypass hardware when possible */
+#define SO_LINGER 0x0080 /* linger on close if data present */
+#define SO_OOBINLINE 0x0100 /* Unimplemented: leave received OOB data in line */
+#define SO_REUSEPORT 0x0200 /* Unimplemented: allow local address & port reuse */
+
+#define SO_DONTLINGER ((int)(~SO_LINGER))
+
+/*
+ * Additional options, not kept in so_options.
+ */
+#define SO_SNDBUF 0x1001 /* Unimplemented: send buffer size */
+#define SO_RCVBUF 0x1002 /* receive buffer size */
+#define SO_SNDLOWAT 0x1003 /* Unimplemented: send low-water mark */
+#define SO_RCVLOWAT 0x1004 /* Unimplemented: receive low-water mark */
+#define SO_SNDTIMEO 0x1005 /* Unimplemented: send timeout */
+#define SO_RCVTIMEO 0x1006 /* receive timeout */
+#define SO_ERROR 0x1007 /* get error status and clear */
+#define SO_TYPE 0x1008 /* get socket type */
+#define SO_CONTIMEO 0x1009 /* Unimplemented: connect timeout */
+#define SO_NO_CHECK 0x100a /* don't create UDP checksum */
+
+
+/*
+ * Structure used for manipulating linger option.
+ */
+struct linger {
+ int l_onoff; /* option on/off */
+ int l_linger; /* linger time */
+};
+
+/*
+ * Level number for (get/set)sockopt() to apply to socket itself.
+ */
+#define SOL_SOCKET 0xfff /* options for socket level */
+
+
+#define AF_UNSPEC 0
+#define AF_INET 2
+#define PF_INET AF_INET
+#define PF_UNSPEC AF_UNSPEC
+
+#define IPPROTO_IP 0
+#define IPPROTO_TCP 6
+#define IPPROTO_UDP 17
+#define IPPROTO_UDPLITE 136
+
+/* Flags we can use with send and recv. */
+#define MSG_PEEK 0x01 /* Peeks at an incoming message */
+#define MSG_WAITALL 0x02 /* Unimplemented: Requests that the function block until the full amount of data requested can be returned */
+#define MSG_OOB 0x04 /* Unimplemented: Requests out-of-band data. The significance and semantics of out-of-band data are protocol-specific */
+#define MSG_DONTWAIT 0x08 /* Nonblocking i/o for this operation only */
+#define MSG_MORE 0x10 /* Sender will send more */
+
+
+/*
+ * Options for level IPPROTO_IP
+ */
+#define IP_TOS 1
+#define IP_TTL 2
+
+#if LWIP_TCP
+/*
+ * Options for level IPPROTO_TCP
+ */
+#define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */
+#define TCP_KEEPALIVE 0x02 /* send KEEPALIVE probes when idle for pcb->keep_idle milliseconds */
+#define TCP_KEEPIDLE 0x03 /* set pcb->keep_idle - Same as TCP_KEEPALIVE, but use seconds for get/setsockopt */
+#define TCP_KEEPINTVL 0x04 /* set pcb->keep_intvl - Use seconds for get/setsockopt */
+#define TCP_KEEPCNT 0x05 /* set pcb->keep_cnt - Use number of probes sent for get/setsockopt */
+#endif /* LWIP_TCP */
+
+#if LWIP_UDP && LWIP_UDPLITE
+/*
+ * Options for level IPPROTO_UDPLITE
+ */
+#define UDPLITE_SEND_CSCOV 0x01 /* sender checksum coverage */
+#define UDPLITE_RECV_CSCOV 0x02 /* minimal receiver checksum coverage */
+#endif /* LWIP_UDP && LWIP_UDPLITE*/
+
+
+#if LWIP_IGMP
+/*
+ * Options and types for UDP multicast traffic handling
+ */
+#define IP_ADD_MEMBERSHIP 3
+#define IP_DROP_MEMBERSHIP 4
+#define IP_MULTICAST_TTL 5
+#define IP_MULTICAST_IF 6
+#define IP_MULTICAST_LOOP 7
+
+typedef struct ip_mreq {
+ struct in_addr imr_multiaddr; /* IP multicast address of group */
+ struct in_addr imr_interface; /* local IP address of interface */
+} ip_mreq;
+#endif /* LWIP_IGMP */
+
+/*
+ * The Type of Service provides an indication of the abstract
+ * parameters of the quality of service desired. These parameters are
+ * to be used to guide the selection of the actual service parameters
+ * when transmitting a datagram through a particular network. Several
+ * networks offer service precedence, which somehow treats high
+ * precedence traffic as more important than other traffic (generally
+ * by accepting only traffic above a certain precedence at time of high
+ * load). The major choice is a three way tradeoff between low-delay,
+ * high-reliability, and high-throughput.
+ * The use of the Delay, Throughput, and Reliability indications may
+ * increase the cost (in some sense) of the service. In many networks
+ * better performance for one of these parameters is coupled with worse
+ * performance on another. Except for very unusual cases at most two
+ * of these three indications should be set.
+ */
+#define IPTOS_TOS_MASK 0x1E
+#define IPTOS_TOS(tos) ((tos) & IPTOS_TOS_MASK)
+#define IPTOS_LOWDELAY 0x10
+#define IPTOS_THROUGHPUT 0x08
+#define IPTOS_RELIABILITY 0x04
+#define IPTOS_LOWCOST 0x02
+#define IPTOS_MINCOST IPTOS_LOWCOST
+
+/*
+ * The Network Control precedence designation is intended to be used
+ * within a network only. The actual use and control of that
+ * designation is up to each network. The Internetwork Control
+ * designation is intended for use by gateway control originators only.
+ * If the actual use of these precedence designations is of concern to
+ * a particular network, it is the responsibility of that network to
+ * control the access to, and use of, those precedence designations.
+ */
+#define IPTOS_PREC_MASK 0xe0
+#define IPTOS_PREC(tos) ((tos) & IPTOS_PREC_MASK)
+#define IPTOS_PREC_NETCONTROL 0xe0
+#define IPTOS_PREC_INTERNETCONTROL 0xc0
+#define IPTOS_PREC_CRITIC_ECP 0xa0
+#define IPTOS_PREC_FLASHOVERRIDE 0x80
+#define IPTOS_PREC_FLASH 0x60
+#define IPTOS_PREC_IMMEDIATE 0x40
+#define IPTOS_PREC_PRIORITY 0x20
+#define IPTOS_PREC_ROUTINE 0x00
+
+
+/*
+ * Commands for ioctlsocket(), taken from the BSD file fcntl.h.
+ * lwip_ioctl only supports FIONREAD and FIONBIO, for now
+ *
+ * Ioctl's have the command encoded in the lower word,
+ * and the size of any in or out parameters in the upper
+ * word. The high 2 bits of the upper word are used
+ * to encode the in/out status of the parameter; for now
+ * we restrict parameters to at most 128 bytes.
+ */
+#if !defined(FIONREAD) || !defined(FIONBIO)
+#define IOCPARM_MASK 0x7fU /* parameters must be < 128 bytes */
+#define IOC_VOID 0x20000000UL /* no parameters */
+#define IOC_OUT 0x40000000UL /* copy out parameters */
+#define IOC_IN 0x80000000UL /* copy in parameters */
+#define IOC_INOUT (IOC_IN|IOC_OUT)
+ /* 0x20000000 distinguishes new &
+ old ioctl's */
+#define _IO(x,y) (IOC_VOID|((x)<<8)|(y))
+
+#define _IOR(x,y,t) (IOC_OUT|(((long)sizeof(t)&IOCPARM_MASK)<<16)|((x)<<8)|(y))
+
+#define _IOW(x,y,t) (IOC_IN|(((long)sizeof(t)&IOCPARM_MASK)<<16)|((x)<<8)|(y))
+#endif /* !defined(FIONREAD) || !defined(FIONBIO) */
+
+#ifndef FIONREAD
+#define FIONREAD _IOR('f', 127, unsigned long) /* get # bytes to read */
+#endif
+#ifndef FIONBIO
+#define FIONBIO _IOW('f', 126, unsigned long) /* set/clear non-blocking i/o */
+#endif
+
+/* Socket I/O Controls: unimplemented */
+#ifndef SIOCSHIWAT
+#define SIOCSHIWAT _IOW('s', 0, unsigned long) /* set high watermark */
+#define SIOCGHIWAT _IOR('s', 1, unsigned long) /* get high watermark */
+#define SIOCSLOWAT _IOW('s', 2, unsigned long) /* set low watermark */
+#define SIOCGLOWAT _IOR('s', 3, unsigned long) /* get low watermark */
+#define SIOCATMARK _IOR('s', 7, unsigned long) /* at oob mark? */
+#endif
+
+/* commands for fnctl */
+#ifndef F_GETFL
+#define F_GETFL 3
+#endif
+#ifndef F_SETFL
+#define F_SETFL 4
+#endif
+
+/* File status flags and file access modes for fnctl,
+ these are bits in an int. */
+#ifndef O_NONBLOCK
+#define O_NONBLOCK 1 /* nonblocking I/O */
+#endif
+#ifndef O_NDELAY
+#define O_NDELAY 1 /* same as O_NONBLOCK, for compatibility */
+#endif
+
+#ifndef SHUT_RD
+ #define SHUT_RD 0
+ #define SHUT_WR 1
+ #define SHUT_RDWR 2
+#endif
+
+/* FD_SET used for lwip_select */
+#ifndef FD_SET
+ #undef FD_SETSIZE
+ /* Make FD_SETSIZE match NUM_SOCKETS in socket.c */
+ #define FD_SETSIZE MEMP_NUM_NETCONN
+ #define FD_SET(n, p) ((p)->fd_bits[(n)/8] |= (1 << ((n) & 7)))
+ #define FD_CLR(n, p) ((p)->fd_bits[(n)/8] &= ~(1 << ((n) & 7)))
+ #define FD_ISSET(n,p) ((p)->fd_bits[(n)/8] & (1 << ((n) & 7)))
+ #define FD_ZERO(p) memset((void*)(p),0,sizeof(*(p)))
+
+ typedef struct fd_set {
+ unsigned char fd_bits [(FD_SETSIZE+7)/8];
+ } fd_set;
+
+#endif /* FD_SET */
+
+/** LWIP_TIMEVAL_PRIVATE: if you want to use the struct timeval provided
+ * by your system, set this to 0 and include <sys/time.h> in cc.h */
+#ifndef LWIP_TIMEVAL_PRIVATE
+#define LWIP_TIMEVAL_PRIVATE 1
+#endif
+
+#if LWIP_TIMEVAL_PRIVATE
+struct timeval {
+ long tv_sec; /* seconds */
+ long tv_usec; /* and microseconds */
+};
+#endif /* LWIP_TIMEVAL_PRIVATE */
+
+void lwip_socket_init(void);
+
+int lwip_accept(int s, struct sockaddr *addr, socklen_t *addrlen);
+int lwip_bind(int s, const struct sockaddr *name, socklen_t namelen);
+int lwip_shutdown(int s, int how);
+int lwip_getpeername (int s, struct sockaddr *name, socklen_t *namelen);
+int lwip_getsockname (int s, struct sockaddr *name, socklen_t *namelen);
+int lwip_getsockopt (int s, int level, int optname, void *optval, socklen_t *optlen);
+int lwip_setsockopt (int s, int level, int optname, const void *optval, socklen_t optlen);
+int lwip_close(int s);
+int lwip_connect(int s, const struct sockaddr *name, socklen_t namelen);
+int lwip_listen(int s, int backlog);
+int lwip_recv(int s, void *mem, size_t len, int flags);
+int lwip_read(int s, void *mem, size_t len);
+int lwip_recvfrom(int s, void *mem, size_t len, int flags,
+ struct sockaddr *from, socklen_t *fromlen);
+int lwip_send(int s, const void *dataptr, size_t size, int flags);
+int lwip_sendto(int s, const void *dataptr, size_t size, int flags,
+ const struct sockaddr *to, socklen_t tolen);
+int lwip_socket(int domain, int type, int protocol);
+int lwip_write(int s, const void *dataptr, size_t size);
+int lwip_select(int maxfdp1, fd_set *readset, fd_set *writeset, fd_set *exceptset,
+ struct timeval *timeout);
+int lwip_ioctl(int s, long cmd, void *argp);
+int lwip_fcntl(int s, int cmd, int val);
+
+#if LWIP_COMPAT_SOCKETS
+#define accept(a,b,c) lwip_accept(a,b,c)
+#define bind(a,b,c) lwip_bind(a,b,c)
+#define shutdown(a,b) lwip_shutdown(a,b)
+#define closesocket(s) lwip_close(s)
+#define connect(a,b,c) lwip_connect(a,b,c)
+#define getsockname(a,b,c) lwip_getsockname(a,b,c)
+#define getpeername(a,b,c) lwip_getpeername(a,b,c)
+#define setsockopt(a,b,c,d,e) lwip_setsockopt(a,b,c,d,e)
+#define getsockopt(a,b,c,d,e) lwip_getsockopt(a,b,c,d,e)
+#define listen(a,b) lwip_listen(a,b)
+#define recv(a,b,c,d) lwip_recv(a,b,c,d)
+#define recvfrom(a,b,c,d,e,f) lwip_recvfrom(a,b,c,d,e,f)
+#define send(a,b,c,d) lwip_send(a,b,c,d)
+#define sendto(a,b,c,d,e,f) lwip_sendto(a,b,c,d,e,f)
+#define socket(a,b,c) lwip_socket(a,b,c)
+#define select(a,b,c,d,e) lwip_select(a,b,c,d,e)
+#define ioctlsocket(a,b,c) lwip_ioctl(a,b,c)
+
+#if LWIP_POSIX_SOCKETS_IO_NAMES
+#define read(a,b,c) lwip_read(a,b,c)
+#define write(a,b,c) lwip_write(a,b,c)
+#define close(s) lwip_close(s)
+#endif /* LWIP_POSIX_SOCKETS_IO_NAMES */
+
+#endif /* LWIP_COMPAT_SOCKETS */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_SOCKET */
+
+#endif /* __LWIP_SOCKETS_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_STATS_H__
+#define __LWIP_STATS_H__
+
+#include "lwip/opt.h"
+
+#include "lwip/mem.h"
+#include "lwip/memp.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if LWIP_STATS
+
+#ifndef LWIP_STATS_LARGE
+#define LWIP_STATS_LARGE 0
+#endif
+
+#if LWIP_STATS_LARGE
+#define STAT_COUNTER u32_t
+#define STAT_COUNTER_F U32_F
+#else
+#define STAT_COUNTER u16_t
+#define STAT_COUNTER_F U16_F
+#endif
+
+struct stats_proto {
+ STAT_COUNTER xmit; /* Transmitted packets. */
+ STAT_COUNTER recv; /* Received packets. */
+ STAT_COUNTER fw; /* Forwarded packets. */
+ STAT_COUNTER drop; /* Dropped packets. */
+ STAT_COUNTER chkerr; /* Checksum error. */
+ STAT_COUNTER lenerr; /* Invalid length error. */
+ STAT_COUNTER memerr; /* Out of memory error. */
+ STAT_COUNTER rterr; /* Routing error. */
+ STAT_COUNTER proterr; /* Protocol error. */
+ STAT_COUNTER opterr; /* Error in options. */
+ STAT_COUNTER err; /* Misc error. */
+ STAT_COUNTER cachehit;
+};
+
+struct stats_igmp {
+ STAT_COUNTER xmit; /* Transmitted packets. */
+ STAT_COUNTER recv; /* Received packets. */
+ STAT_COUNTER drop; /* Dropped packets. */
+ STAT_COUNTER chkerr; /* Checksum error. */
+ STAT_COUNTER lenerr; /* Invalid length error. */
+ STAT_COUNTER memerr; /* Out of memory error. */
+ STAT_COUNTER proterr; /* Protocol error. */
+ STAT_COUNTER rx_v1; /* Received v1 frames. */
+ STAT_COUNTER rx_group; /* Received group-specific queries. */
+ STAT_COUNTER rx_general; /* Received general queries. */
+ STAT_COUNTER rx_report; /* Received reports. */
+ STAT_COUNTER tx_join; /* Sent joins. */
+ STAT_COUNTER tx_leave; /* Sent leaves. */
+ STAT_COUNTER tx_report; /* Sent reports. */
+};
+
+struct stats_mem {
+#ifdef LWIP_DEBUG
+ const char *name;
+#endif /* LWIP_DEBUG */
+ mem_size_t avail;
+ mem_size_t used;
+ mem_size_t max;
+ STAT_COUNTER err;
+ STAT_COUNTER illegal;
+};
+
+struct stats_syselem {
+ STAT_COUNTER used;
+ STAT_COUNTER max;
+ STAT_COUNTER err;
+};
+
+struct stats_sys {
+ struct stats_syselem sem;
+ struct stats_syselem mutex;
+ struct stats_syselem mbox;
+};
+
+struct stats_ {
+#if LINK_STATS
+ struct stats_proto link;
+#endif
+#if ETHARP_STATS
+ struct stats_proto etharp;
+#endif
+#if IPFRAG_STATS
+ struct stats_proto ip_frag;
+#endif
+#if IP_STATS
+ struct stats_proto ip;
+#endif
+#if ICMP_STATS
+ struct stats_proto icmp;
+#endif
+#if IGMP_STATS
+ struct stats_igmp igmp;
+#endif
+#if UDP_STATS
+ struct stats_proto udp;
+#endif
+#if TCP_STATS
+ struct stats_proto tcp;
+#endif
+#if MEM_STATS
+ struct stats_mem mem;
+#endif
+#if MEMP_STATS
+ struct stats_mem memp[MEMP_MAX];
+#endif
+#if SYS_STATS
+ struct stats_sys sys;
+#endif
+};
+
+extern struct stats_ lwip_stats;
+
+void stats_init(void);
+
+#define STATS_INC(x) ++lwip_stats.x
+#define STATS_DEC(x) --lwip_stats.x
+#define STATS_INC_USED(x, y) do { lwip_stats.x.used += y; \
+ if (lwip_stats.x.max < lwip_stats.x.used) { \
+ lwip_stats.x.max = lwip_stats.x.used; \
+ } \
+ } while(0)
+#else /* LWIP_STATS */
+#define stats_init()
+#define STATS_INC(x)
+#define STATS_DEC(x)
+#define STATS_INC_USED(x)
+#endif /* LWIP_STATS */
+
+#if TCP_STATS
+#define TCP_STATS_INC(x) STATS_INC(x)
+#define TCP_STATS_DISPLAY() stats_display_proto(&lwip_stats.tcp, "TCP")
+#else
+#define TCP_STATS_INC(x)
+#define TCP_STATS_DISPLAY()
+#endif
+
+#if UDP_STATS
+#define UDP_STATS_INC(x) STATS_INC(x)
+#define UDP_STATS_DISPLAY() stats_display_proto(&lwip_stats.udp, "UDP")
+#else
+#define UDP_STATS_INC(x)
+#define UDP_STATS_DISPLAY()
+#endif
+
+#if ICMP_STATS
+#define ICMP_STATS_INC(x) STATS_INC(x)
+#define ICMP_STATS_DISPLAY() stats_display_proto(&lwip_stats.icmp, "ICMP")
+#else
+#define ICMP_STATS_INC(x)
+#define ICMP_STATS_DISPLAY()
+#endif
+
+#if IGMP_STATS
+#define IGMP_STATS_INC(x) STATS_INC(x)
+#define IGMP_STATS_DISPLAY() stats_display_igmp(&lwip_stats.igmp)
+#else
+#define IGMP_STATS_INC(x)
+#define IGMP_STATS_DISPLAY()
+#endif
+
+#if IP_STATS
+#define IP_STATS_INC(x) STATS_INC(x)
+#define IP_STATS_DISPLAY() stats_display_proto(&lwip_stats.ip, "IP")
+#else
+#define IP_STATS_INC(x)
+#define IP_STATS_DISPLAY()
+#endif
+
+#if IPFRAG_STATS
+#define IPFRAG_STATS_INC(x) STATS_INC(x)
+#define IPFRAG_STATS_DISPLAY() stats_display_proto(&lwip_stats.ip_frag, "IP_FRAG")
+#else
+#define IPFRAG_STATS_INC(x)
+#define IPFRAG_STATS_DISPLAY()
+#endif
+
+#if ETHARP_STATS
+#define ETHARP_STATS_INC(x) STATS_INC(x)
+#define ETHARP_STATS_DISPLAY() stats_display_proto(&lwip_stats.etharp, "ETHARP")
+#else
+#define ETHARP_STATS_INC(x)
+#define ETHARP_STATS_DISPLAY()
+#endif
+
+#if LINK_STATS
+#define LINK_STATS_INC(x) STATS_INC(x)
+#define LINK_STATS_DISPLAY() stats_display_proto(&lwip_stats.link, "LINK")
+#else
+#define LINK_STATS_INC(x)
+#define LINK_STATS_DISPLAY()
+#endif
+
+#if MEM_STATS
+#define MEM_STATS_AVAIL(x, y) lwip_stats.mem.x = y
+#define MEM_STATS_INC(x) STATS_INC(mem.x)
+#define MEM_STATS_INC_USED(x, y) STATS_INC_USED(mem, y)
+#define MEM_STATS_DEC_USED(x, y) lwip_stats.mem.x -= y
+#define MEM_STATS_DISPLAY() stats_display_mem(&lwip_stats.mem, "HEAP")
+#else
+#define MEM_STATS_AVAIL(x, y)
+#define MEM_STATS_INC(x)
+#define MEM_STATS_INC_USED(x, y)
+#define MEM_STATS_DEC_USED(x, y)
+#define MEM_STATS_DISPLAY()
+#endif
+
+#if MEMP_STATS
+#define MEMP_STATS_AVAIL(x, i, y) lwip_stats.memp[i].x = y
+#define MEMP_STATS_INC(x, i) STATS_INC(memp[i].x)
+#define MEMP_STATS_DEC(x, i) STATS_DEC(memp[i].x)
+#define MEMP_STATS_INC_USED(x, i) STATS_INC_USED(memp[i], 1)
+#define MEMP_STATS_DISPLAY(i) stats_display_memp(&lwip_stats.memp[i], i)
+#else
+#define MEMP_STATS_AVAIL(x, i, y)
+#define MEMP_STATS_INC(x, i)
+#define MEMP_STATS_DEC(x, i)
+#define MEMP_STATS_INC_USED(x, i)
+#define MEMP_STATS_DISPLAY(i)
+#endif
+
+#if SYS_STATS
+#define SYS_STATS_INC(x) STATS_INC(sys.x)
+#define SYS_STATS_DEC(x) STATS_DEC(sys.x)
+#define SYS_STATS_INC_USED(x) STATS_INC_USED(sys.x, 1)
+#define SYS_STATS_DISPLAY() stats_display_sys(&lwip_stats.sys)
+#else
+#define SYS_STATS_INC(x)
+#define SYS_STATS_DEC(x)
+#define SYS_STATS_INC_USED(x)
+#define SYS_STATS_DISPLAY()
+#endif
+
+/* Display of statistics */
+#if LWIP_STATS_DISPLAY
+void stats_display(void);
+void stats_display_proto(struct stats_proto *proto, char *name);
+void stats_display_igmp(struct stats_igmp *igmp);
+void stats_display_mem(struct stats_mem *mem, char *name);
+void stats_display_memp(struct stats_mem *mem, int index);
+void stats_display_sys(struct stats_sys *sys);
+#else /* LWIP_STATS_DISPLAY */
+#define stats_display()
+#define stats_display_proto(proto, name)
+#define stats_display_igmp(igmp)
+#define stats_display_mem(mem, name)
+#define stats_display_memp(mem, index)
+#define stats_display_sys(sys)
+#endif /* LWIP_STATS_DISPLAY */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LWIP_STATS_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_SYS_H__
+#define __LWIP_SYS_H__
+
+#include "lwip/opt.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if NO_SYS
+
+/* For a totally minimal and standalone system, we provide null
+ definitions of the sys_ functions. */
+typedef u8_t sys_sem_t;
+typedef u8_t sys_mutex_t;
+typedef u8_t sys_mbox_t;
+
+#define sys_sem_new(s, c) ERR_OK
+#define sys_sem_signal(s)
+#define sys_sem_wait(s)
+#define sys_arch_sem_wait(s,t)
+#define sys_sem_free(s)
+#define sys_mutex_new(mu) ERR_OK
+#define sys_mutex_lock(mu)
+#define sys_mutex_unlock(mu)
+#define sys_mutex_free(mu)
+#define sys_mbox_new(m, s) ERR_OK
+#define sys_mbox_fetch(m,d)
+#define sys_mbox_tryfetch(m,d)
+#define sys_mbox_post(m,d)
+#define sys_mbox_trypost(m,d)
+#define sys_mbox_free(m)
+
+#define sys_thread_new(n,t,a,s,p)
+
+#define sys_msleep(t)
+
+#else /* NO_SYS */
+
+/** Return code for timeouts from sys_arch_mbox_fetch and sys_arch_sem_wait */
+#define SYS_ARCH_TIMEOUT 0xffffffffUL
+
+/** sys_mbox_tryfetch() returns SYS_MBOX_EMPTY if appropriate.
+ * For now we use the same magic value, but we allow this to change in future.
+ */
+#define SYS_MBOX_EMPTY SYS_ARCH_TIMEOUT
+
+#include "lwip/err.h"
+#include "arch/sys_arch.h"
+
+/** Function prototype for thread functions */
+typedef void (*lwip_thread_fn)(void *arg);
+
+/* Function prototypes for functions to be implemented by platform ports
+ (in sys_arch.c) */
+
+/* Mutex functions: */
+
+/** Define LWIP_COMPAT_MUTEX if the port has no mutexes and binary semaphores
+ should be used instead */
+#if LWIP_COMPAT_MUTEX
+/* for old ports that don't have mutexes: define them to binary semaphores */
+#define sys_mutex_t sys_sem_t
+#define sys_mutex_new(mutex) sys_sem_new(mutex, 1)
+#define sys_mutex_lock(mutex) sys_sem_wait(mutex)
+#define sys_mutex_unlock(mutex) sys_sem_signal(mutex)
+#define sys_mutex_free(mutex) sys_sem_free(mutex)
+#define sys_mutex_valid(mutex) sys_sem_valid(mutex)
+#define sys_mutex_set_invalid(mutex) sys_sem_set_invalid(mutex)
+
+#else /* LWIP_COMPAT_MUTEX */
+
+/** Create a new mutex
+ * @param mutex pointer to the mutex to create
+ * @return a new mutex */
+err_t sys_mutex_new(sys_mutex_t *mutex);
+/** Lock a mutex
+ * @param mutex the mutex to lock */
+void sys_mutex_lock(sys_mutex_t *mutex);
+/** Unlock a mutex
+ * @param mutex the mutex to unlock */
+void sys_mutex_unlock(sys_mutex_t *mutex);
+/** Delete a semaphore
+ * @param mutex the mutex to delete */
+void sys_mutex_free(sys_mutex_t *mutex);
+#ifndef sys_mutex_valid
+/** Check if a mutex is valid/allocated: return 1 for valid, 0 for invalid */
+int sys_mutex_valid(sys_mutex_t *mutex);
+#endif
+#ifndef sys_mutex_set_invalid
+/** Set a mutex invalid so that sys_mutex_valid returns 0 */
+void sys_mutex_set_invalid(sys_mutex_t *mutex);
+#endif
+#endif /* LWIP_COMPAT_MUTEX */
+
+/* Semaphore functions: */
+
+/** Create a new semaphore
+ * @param sem pointer to the semaphore to create
+ * @param count initial count of the semaphore
+ * @return ERR_OK if successful, another err_t otherwise */
+err_t sys_sem_new(sys_sem_t *sem, u8_t count);
+/** Signals a semaphore
+ * @param sem the semaphore to signal */
+void sys_sem_signal(sys_sem_t *sem);
+/** Wait for a semaphore for the specified timeout
+ * @param sem the semaphore to wait for
+ * @param timeout timeout in milliseconds to wait (0 = wait forever)
+ * @return time (in milliseconds) waited for the semaphore
+ * or SYS_ARCH_TIMEOUT on timeout */
+u32_t sys_arch_sem_wait(sys_sem_t *sem, u32_t timeout);
+/** Delete a semaphore
+ * @param sem semaphore to delete */
+void sys_sem_free(sys_sem_t *sem);
+/** Wait for a semaphore - forever/no timeout */
+#define sys_sem_wait(sem) sys_arch_sem_wait(sem, 0)
+#ifndef sys_sem_valid
+/** Check if a sempahore is valid/allocated: return 1 for valid, 0 for invalid */
+int sys_sem_valid(sys_sem_t *sem);
+#endif
+#ifndef sys_sem_set_invalid
+/** Set a semaphore invalid so that sys_sem_valid returns 0 */
+void sys_sem_set_invalid(sys_sem_t *sem);
+#endif
+
+/* Time functions. */
+#ifndef sys_msleep
+void sys_msleep(u32_t ms); /* only has a (close to) 1 jiffy resolution. */
+#endif
+
+/* Mailbox functions. */
+
+/** Create a new mbox of specified size
+ * @param mbox pointer to the mbox to create
+ * @param size (miminum) number of messages in this mbox
+ * @return ERR_OK if successful, another err_t otherwise */
+err_t sys_mbox_new(sys_mbox_t *mbox, int size);
+/** Post a message to an mbox - may not fail
+ * -> blocks if full, only used from tasks not from ISR
+ * @param mbox mbox to posts the message
+ * @param msg message to post (ATTENTION: can be NULL) */
+void sys_mbox_post(sys_mbox_t *mbox, void *msg);
+/** Try to post a message to an mbox - may fail if full or ISR
+ * @param mbox mbox to posts the message
+ * @param msg message to post (ATTENTION: can be NULL) */
+err_t sys_mbox_trypost(sys_mbox_t *mbox, void *msg);
+/** Wait for a new message to arrive in the mbox
+ * @param mbox mbox to get a message from
+ * @param msg pointer where the message is stored
+ * @param timeout maximum time (in milliseconds) to wait for a message
+ * @return time (in milliseconds) waited for a message, may be 0 if not waited
+ or SYS_ARCH_TIMEOUT on timeout
+ * The returned time has to be accurate to prevent timer jitter! */
+u32_t sys_arch_mbox_fetch(sys_mbox_t *mbox, void **msg, u32_t timeout);
+/* Allow port to override with a macro, e.g. special timout for sys_arch_mbox_fetch() */
+#ifndef sys_arch_mbox_tryfetch
+/** Wait for a new message to arrive in the mbox
+ * @param mbox mbox to get a message from
+ * @param msg pointer where the message is stored
+ * @param timeout maximum time (in milliseconds) to wait for a message
+ * @return 0 (milliseconds) if a message has been received
+ * or SYS_MBOX_EMPTY if the mailbox is empty */
+u32_t sys_arch_mbox_tryfetch(sys_mbox_t *mbox, void **msg);
+#endif
+/** For now, we map straight to sys_arch implementation. */
+#define sys_mbox_tryfetch(mbox, msg) sys_arch_mbox_tryfetch(mbox, msg)
+/** Delete an mbox
+ * @param mbox mbox to delete */
+void sys_mbox_free(sys_mbox_t *mbox);
+#define sys_mbox_fetch(mbox, msg) sys_arch_mbox_fetch(mbox, msg, 0)
+#ifndef sys_mbox_valid
+/** Check if an mbox is valid/allocated: return 1 for valid, 0 for invalid */
+int sys_mbox_valid(sys_mbox_t *mbox);
+#endif
+#ifndef sys_mbox_set_invalid
+/** Set an mbox invalid so that sys_mbox_valid returns 0 */
+void sys_mbox_set_invalid(sys_mbox_t *mbox);
+#endif
+
+/** The only thread function:
+ * Creates a new thread
+ * @param name human-readable name for the thread (used for debugging purposes)
+ * @param thread thread-function
+ * @param arg parameter passed to 'thread'
+ * @param stacksize stack size in bytes for the new thread (may be ignored by ports)
+ * @param prio priority of the new thread (may be ignored by ports) */
+sys_thread_t sys_thread_new(const char *name, lwip_thread_fn thread, void *arg, int stacksize, int prio);
+
+#endif /* NO_SYS */
+
+/* sys_init() must be called before anthing else. */
+void sys_init(void);
+
+#ifndef sys_jiffies
+/** Ticks/jiffies since power up. */
+u32_t sys_jiffies(void);
+#endif
+
+/** Returns the current time in milliseconds,
+ * may be the same as sys_jiffies or at least based on it. */
+u32_t sys_now(void);
+
+/* Critical Region Protection */
+/* These functions must be implemented in the sys_arch.c file.
+ In some implementations they can provide a more light-weight protection
+ mechanism than using semaphores. Otherwise semaphores can be used for
+ implementation */
+#ifndef SYS_ARCH_PROTECT
+/** SYS_LIGHTWEIGHT_PROT
+ * define SYS_LIGHTWEIGHT_PROT in lwipopts.h if you want inter-task protection
+ * for certain critical regions during buffer allocation, deallocation and memory
+ * allocation and deallocation.
+ */
+#if SYS_LIGHTWEIGHT_PROT
+
+/** SYS_ARCH_DECL_PROTECT
+ * declare a protection variable. This macro will default to defining a variable of
+ * type sys_prot_t. If a particular port needs a different implementation, then
+ * this macro may be defined in sys_arch.h.
+ */
+#define SYS_ARCH_DECL_PROTECT(lev) sys_prot_t lev
+/** SYS_ARCH_PROTECT
+ * Perform a "fast" protect. This could be implemented by
+ * disabling interrupts for an embedded system or by using a semaphore or
+ * mutex. The implementation should allow calling SYS_ARCH_PROTECT when
+ * already protected. The old protection level is returned in the variable
+ * "lev". This macro will default to calling the sys_arch_protect() function
+ * which should be implemented in sys_arch.c. If a particular port needs a
+ * different implementation, then this macro may be defined in sys_arch.h
+ */
+#define SYS_ARCH_PROTECT(lev) lev = sys_arch_protect()
+/** SYS_ARCH_UNPROTECT
+ * Perform a "fast" set of the protection level to "lev". This could be
+ * implemented by setting the interrupt level to "lev" within the MACRO or by
+ * using a semaphore or mutex. This macro will default to calling the
+ * sys_arch_unprotect() function which should be implemented in
+ * sys_arch.c. If a particular port needs a different implementation, then
+ * this macro may be defined in sys_arch.h
+ */
+#define SYS_ARCH_UNPROTECT(lev) sys_arch_unprotect(lev)
+sys_prot_t sys_arch_protect(void);
+void sys_arch_unprotect(sys_prot_t pval);
+
+#else
+
+#define SYS_ARCH_DECL_PROTECT(lev)
+#define SYS_ARCH_PROTECT(lev)
+#define SYS_ARCH_UNPROTECT(lev)
+
+#endif /* SYS_LIGHTWEIGHT_PROT */
+
+#endif /* SYS_ARCH_PROTECT */
+
+/*
+ * Macros to set/get and increase/decrease variables in a thread-safe way.
+ * Use these for accessing variable that are used from more than one thread.
+ */
+
+#ifndef SYS_ARCH_INC
+#define SYS_ARCH_INC(var, val) do { \
+ SYS_ARCH_DECL_PROTECT(old_level); \
+ SYS_ARCH_PROTECT(old_level); \
+ var += val; \
+ SYS_ARCH_UNPROTECT(old_level); \
+ } while(0)
+#endif /* SYS_ARCH_INC */
+
+#ifndef SYS_ARCH_DEC
+#define SYS_ARCH_DEC(var, val) do { \
+ SYS_ARCH_DECL_PROTECT(old_level); \
+ SYS_ARCH_PROTECT(old_level); \
+ var -= val; \
+ SYS_ARCH_UNPROTECT(old_level); \
+ } while(0)
+#endif /* SYS_ARCH_DEC */
+
+#ifndef SYS_ARCH_GET
+#define SYS_ARCH_GET(var, ret) do { \
+ SYS_ARCH_DECL_PROTECT(old_level); \
+ SYS_ARCH_PROTECT(old_level); \
+ ret = var; \
+ SYS_ARCH_UNPROTECT(old_level); \
+ } while(0)
+#endif /* SYS_ARCH_GET */
+
+#ifndef SYS_ARCH_SET
+#define SYS_ARCH_SET(var, val) do { \
+ SYS_ARCH_DECL_PROTECT(old_level); \
+ SYS_ARCH_PROTECT(old_level); \
+ var = val; \
+ SYS_ARCH_UNPROTECT(old_level); \
+ } while(0)
+#endif /* SYS_ARCH_SET */
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LWIP_SYS_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_TCP_H__
+#define __LWIP_TCP_H__
+
+#include "lwip/opt.h"
+
+#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/sys.h"
+#include "lwip/mem.h"
+#include "lwip/pbuf.h"
+#include "lwip/ip.h"
+#include "lwip/icmp.h"
+#include "lwip/err.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct tcp_pcb;
+
+/** Function prototype for tcp accept callback functions. Called when a new
+ * connection can be accepted on a listening pcb.
+ *
+ * @param arg Additional argument to pass to the callback function (@see tcp_arg())
+ * @param newpcb The new connection pcb
+ * @param err An error code if there has been an error accepting.
+ * Only return ERR_ABRT if you have called tcp_abort from within the
+ * callback function!
+ */
+typedef err_t (*tcp_accept_fn)(void *arg, struct tcp_pcb *newpcb, err_t err);
+
+/** Function prototype for tcp receive callback functions. Called when data has
+ * been received.
+ *
+ * @param arg Additional argument to pass to the callback function (@see tcp_arg())
+ * @param tpcb The connection pcb which received data
+ * @param p The received data (or NULL when the connection has been closed!)
+ * @param err An error code if there has been an error receiving
+ * Only return ERR_ABRT if you have called tcp_abort from within the
+ * callback function!
+ */
+typedef err_t (*tcp_recv_fn)(void *arg, struct tcp_pcb *tpcb,
+ struct pbuf *p, err_t err);
+
+/** Function prototype for tcp sent callback functions. Called when sent data has
+ * been acknowledged by the remote side. Use it to free corresponding resources.
+ * This also means that the pcb has now space available to send new data.
+ *
+ * @param arg Additional argument to pass to the callback function (@see tcp_arg())
+ * @param tpcb The connection pcb for which data has been acknowledged
+ * @param len The amount of bytes acknowledged
+ * @return ERR_OK: try to send some data by calling tcp_output
+ * Only return ERR_ABRT if you have called tcp_abort from within the
+ * callback function!
+ */
+typedef err_t (*tcp_sent_fn)(void *arg, struct tcp_pcb *tpcb,
+ u16_t len);
+
+/** Function prototype for tcp poll callback functions. Called periodically as
+ * specified by @see tcp_poll.
+ *
+ * @param arg Additional argument to pass to the callback function (@see tcp_arg())
+ * @param tpcb tcp pcb
+ * @return ERR_OK: try to send some data by calling tcp_output
+ * Only return ERR_ABRT if you have called tcp_abort from within the
+ * callback function!
+ */
+typedef err_t (*tcp_poll_fn)(void *arg, struct tcp_pcb *tpcb);
+
+/** Function prototype for tcp error callback functions. Called when the pcb
+ * receives a RST or is unexpectedly closed for any other reason.
+ *
+ * @note The corresponding pcb is already freed when this callback is called!
+ *
+ * @param arg Additional argument to pass to the callback function (@see tcp_arg())
+ * @param err Error code to indicate why the pcb has been closed
+ * ERR_ABRT: aborted through tcp_abort or by a TCP timer
+ * ERR_RST: the connection was reset by the remote host
+ */
+typedef void (*tcp_err_fn)(void *arg, err_t err);
+
+/** Function prototype for tcp connected callback functions. Called when a pcb
+ * is connected to the remote side after initiating a connection attempt by
+ * calling tcp_connect().
+ *
+ * @param arg Additional argument to pass to the callback function (@see tcp_arg())
+ * @param tpcb The connection pcb which is connected
+ * @param err An unused error code, always ERR_OK currently ;-) TODO!
+ * Only return ERR_ABRT if you have called tcp_abort from within the
+ * callback function!
+ *
+ * @note When a connection attempt fails, the error callback is currently called!
+ */
+typedef err_t (*tcp_connected_fn)(void *arg, struct tcp_pcb *tpcb, err_t err);
+
+enum tcp_state {
+ CLOSED = 0,
+ LISTEN = 1,
+ SYN_SENT = 2,
+ SYN_RCVD = 3,
+ ESTABLISHED = 4,
+ FIN_WAIT_1 = 5,
+ FIN_WAIT_2 = 6,
+ CLOSE_WAIT = 7,
+ CLOSING = 8,
+ LAST_ACK = 9,
+ TIME_WAIT = 10
+};
+
+#if LWIP_CALLBACK_API
+ /* Function to call when a listener has been connected.
+ * @param arg user-supplied argument (tcp_pcb.callback_arg)
+ * @param pcb a new tcp_pcb that now is connected
+ * @param err an error argument (TODO: that is current always ERR_OK?)
+ * @return ERR_OK: accept the new connection,
+ * any other err_t abortsthe new connection
+ */
+#define DEF_ACCEPT_CALLBACK tcp_accept_fn accept;
+#else /* LWIP_CALLBACK_API */
+#define DEF_ACCEPT_CALLBACK
+#endif /* LWIP_CALLBACK_API */
+
+/**
+ * members common to struct tcp_pcb and struct tcp_listen_pcb
+ */
+#define TCP_PCB_COMMON(type) \
+ type *next; /* for the linked list */ \
+ enum tcp_state state; /* TCP state */ \
+ u8_t prio; \
+ void *callback_arg; \
+ /* the accept callback for listen- and normal pcbs, if LWIP_CALLBACK_API */ \
+ DEF_ACCEPT_CALLBACK \
+ /* ports are in host byte order */ \
+ u16_t local_port
+
+
+/* the TCP protocol control block */
+struct tcp_pcb {
+/** common PCB members */
+ IP_PCB;
+/** protocol specific PCB members */
+ TCP_PCB_COMMON(struct tcp_pcb);
+
+ /* ports are in host byte order */
+ u16_t remote_port;
+
+ u8_t flags;
+#define TF_ACK_DELAY ((u8_t)0x01U) /* Delayed ACK. */
+#define TF_ACK_NOW ((u8_t)0x02U) /* Immediate ACK. */
+#define TF_INFR ((u8_t)0x04U) /* In fast recovery. */
+#define TF_TIMESTAMP ((u8_t)0x08U) /* Timestamp option enabled */
+#define TF_RXCLOSED ((u8_t)0x10U) /* rx closed by tcp_shutdown */
+#define TF_FIN ((u8_t)0x20U) /* Connection was closed locally (FIN segment enqueued). */
+#define TF_NODELAY ((u8_t)0x40U) /* Disable Nagle algorithm */
+#define TF_NAGLEMEMERR ((u8_t)0x80U) /* nagle enabled, memerr, try to output to prevent delayed ACK to happen */
+
+ /* the rest of the fields are in host byte order
+ as we have to do some math with them */
+ /* receiver variables */
+ u32_t rcv_nxt; /* next seqno expected */
+ u16_t rcv_wnd; /* receiver window available */
+ u16_t rcv_ann_wnd; /* receiver window to announce */
+ u32_t rcv_ann_right_edge; /* announced right edge of window */
+
+ /* Timers */
+ u32_t tmr;
+ u8_t polltmr, pollinterval;
+
+ /* Retransmission timer. */
+ s16_t rtime;
+
+ u16_t mss; /* maximum segment size */
+
+ /* RTT (round trip time) estimation variables */
+ u32_t rttest; /* RTT estimate in 500ms ticks */
+ u32_t rtseq; /* sequence number being timed */
+ s16_t sa, sv; /* @todo document this */
+
+ s16_t rto; /* retransmission time-out */
+ u8_t nrtx; /* number of retransmissions */
+
+ /* fast retransmit/recovery */
+ u32_t lastack; /* Highest acknowledged seqno. */
+ u8_t dupacks;
+
+ /* congestion avoidance/control variables */
+ u16_t cwnd;
+ u16_t ssthresh;
+
+ /* sender variables */
+ u32_t snd_nxt; /* next new seqno to be sent */
+ u16_t snd_wnd; /* sender window */
+ u32_t snd_wl1, snd_wl2; /* Sequence and acknowledgement numbers of last
+ window update. */
+ u32_t snd_lbb; /* Sequence number of next byte to be buffered. */
+
+ u16_t acked;
+
+ u16_t snd_buf; /* Available buffer space for sending (in bytes). */
+#define TCP_SNDQUEUELEN_OVERFLOW (0xffffU-3)
+ u16_t snd_queuelen; /* Available buffer space for sending (in tcp_segs). */
+
+#if TCP_OVERSIZE
+ /* Extra bytes available at the end of the last pbuf in unsent. */
+ u16_t unsent_oversize;
+#endif /* TCP_OVERSIZE */
+
+ /* These are ordered by sequence number: */
+ struct tcp_seg *unsent; /* Unsent (queued) segments. */
+ struct tcp_seg *unacked; /* Sent but unacknowledged segments. */
+#if TCP_QUEUE_OOSEQ
+ struct tcp_seg *ooseq; /* Received out of sequence segments. */
+#endif /* TCP_QUEUE_OOSEQ */
+
+ struct pbuf *refused_data; /* Data previously received but not yet taken by upper layer */
+
+#if LWIP_CALLBACK_API
+ /* Function to be called when more send buffer space is available. */
+ tcp_sent_fn sent;
+ /* Function to be called when (in-sequence) data has arrived. */
+ tcp_recv_fn recv;
+ /* Function to be called when a connection has been set up. */
+ tcp_connected_fn connected;
+ /* Function which is called periodically. */
+ tcp_poll_fn poll;
+ /* Function to be called whenever a fatal error occurs. */
+ tcp_err_fn errf;
+#endif /* LWIP_CALLBACK_API */
+
+#if LWIP_TCP_TIMESTAMPS
+ u32_t ts_lastacksent;
+ u32_t ts_recent;
+#endif /* LWIP_TCP_TIMESTAMPS */
+
+ /* idle time before KEEPALIVE is sent */
+ u32_t keep_idle;
+#if LWIP_TCP_KEEPALIVE
+ u32_t keep_intvl;
+ u32_t keep_cnt;
+#endif /* LWIP_TCP_KEEPALIVE */
+
+ /* Persist timer counter */
+ u32_t persist_cnt;
+ /* Persist timer back-off */
+ u8_t persist_backoff;
+
+ /* KEEPALIVE counter */
+ u8_t keep_cnt_sent;
+};
+
+struct tcp_pcb_listen {
+/* Common members of all PCB types */
+ IP_PCB;
+/* Protocol specific PCB members */
+ TCP_PCB_COMMON(struct tcp_pcb_listen);
+
+#if TCP_LISTEN_BACKLOG
+ u8_t backlog;
+ u8_t accepts_pending;
+#endif /* TCP_LISTEN_BACKLOG */
+};
+
+#if LWIP_EVENT_API
+
+enum lwip_event {
+ LWIP_EVENT_ACCEPT,
+ LWIP_EVENT_SENT,
+ LWIP_EVENT_RECV,
+ LWIP_EVENT_CONNECTED,
+ LWIP_EVENT_POLL,
+ LWIP_EVENT_ERR
+};
+
+err_t lwip_tcp_event(void *arg, struct tcp_pcb *pcb,
+ enum lwip_event,
+ struct pbuf *p,
+ u16_t size,
+ err_t err);
+
+#endif /* LWIP_EVENT_API */
+
+/* Application program's interface: */
+struct tcp_pcb * tcp_new (void);
+
+void tcp_arg (struct tcp_pcb *pcb, void *arg);
+void tcp_accept (struct tcp_pcb *pcb, tcp_accept_fn accept);
+void tcp_recv (struct tcp_pcb *pcb, tcp_recv_fn recv);
+void tcp_sent (struct tcp_pcb *pcb, tcp_sent_fn sent);
+void tcp_poll (struct tcp_pcb *pcb, tcp_poll_fn poll, u8_t interval);
+void tcp_err (struct tcp_pcb *pcb, tcp_err_fn err);
+
+#define tcp_mss(pcb) (((pcb)->flags & TF_TIMESTAMP) ? ((pcb)->mss - 12) : (pcb)->mss)
+#define tcp_sndbuf(pcb) ((pcb)->snd_buf)
+#define tcp_sndqueuelen(pcb) ((pcb)->snd_queuelen)
+#define tcp_nagle_disable(pcb) ((pcb)->flags |= TF_NODELAY)
+#define tcp_nagle_enable(pcb) ((pcb)->flags &= ~TF_NODELAY)
+#define tcp_nagle_disabled(pcb) (((pcb)->flags & TF_NODELAY) != 0)
+
+#if TCP_LISTEN_BACKLOG
+#define tcp_accepted(pcb) do { \
+ LWIP_ASSERT("pcb->state == LISTEN (called for wrong pcb?)", pcb->state == LISTEN); \
+ (((struct tcp_pcb_listen *)(pcb))->accepts_pending--); } while(0)
+#else /* TCP_LISTEN_BACKLOG */
+#define tcp_accepted(pcb) LWIP_ASSERT("pcb->state == LISTEN (called for wrong pcb?)", \
+ pcb->state == LISTEN)
+#endif /* TCP_LISTEN_BACKLOG */
+
+void tcp_recved (struct tcp_pcb *pcb, u16_t len);
+err_t tcp_bind (struct tcp_pcb *pcb, ip_addr_t *ipaddr,
+ u16_t port);
+err_t tcp_connect (struct tcp_pcb *pcb, ip_addr_t *ipaddr,
+ u16_t port, tcp_connected_fn connected);
+
+struct tcp_pcb * tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog);
+#define tcp_listen(pcb) tcp_listen_with_backlog(pcb, TCP_DEFAULT_LISTEN_BACKLOG)
+
+void tcp_abort (struct tcp_pcb *pcb);
+err_t tcp_close (struct tcp_pcb *pcb);
+err_t tcp_shutdown(struct tcp_pcb *pcb, int shut_rx, int shut_tx);
+
+/* Flags for "apiflags" parameter in tcp_write */
+#define TCP_WRITE_FLAG_COPY 0x01
+#define TCP_WRITE_FLAG_MORE 0x02
+
+err_t tcp_write (struct tcp_pcb *pcb, const void *dataptr, u16_t len,
+ u8_t apiflags);
+
+void tcp_setprio (struct tcp_pcb *pcb, u8_t prio);
+
+#define TCP_PRIO_MIN 1
+#define TCP_PRIO_NORMAL 64
+#define TCP_PRIO_MAX 127
+
+err_t tcp_output (struct tcp_pcb *pcb);
+
+
+const char* tcp_debug_state_str(enum tcp_state s);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_TCP */
+
+#endif /* __LWIP_TCP_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_TCP_IMPL_H__
+#define __LWIP_TCP_IMPL_H__
+
+#include "lwip/opt.h"
+
+#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/tcp.h"
+#include "lwip/sys.h"
+#include "lwip/mem.h"
+#include "lwip/pbuf.h"
+#include "lwip/ip.h"
+#include "lwip/icmp.h"
+#include "lwip/err.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Functions for interfacing with TCP: */
+
+/* Lower layer interface to TCP: */
+#define tcp_init() /* Compatibility define, no init needed. */
+void tcp_tmr (void); /* Must be called every
+ TCP_TMR_INTERVAL
+ ms. (Typically 250 ms). */
+/* It is also possible to call these two functions at the right
+ intervals (instead of calling tcp_tmr()). */
+void tcp_slowtmr (void);
+void tcp_fasttmr (void);
+
+
+/* Only used by IP to pass a TCP segment to TCP: */
+void tcp_input (struct pbuf *p, struct netif *inp);
+/* Used within the TCP code only: */
+struct tcp_pcb * tcp_alloc (u8_t prio);
+void tcp_abandon (struct tcp_pcb *pcb, int reset);
+err_t tcp_send_empty_ack(struct tcp_pcb *pcb);
+void tcp_rexmit (struct tcp_pcb *pcb);
+void tcp_rexmit_rto (struct tcp_pcb *pcb);
+void tcp_rexmit_fast (struct tcp_pcb *pcb);
+u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb);
+
+/**
+ * This is the Nagle algorithm: try to combine user data to send as few TCP
+ * segments as possible. Only send if
+ * - no previously transmitted data on the connection remains unacknowledged or
+ * - the TF_NODELAY flag is set (nagle algorithm turned off for this pcb) or
+ * - the only unsent segment is at least pcb->mss bytes long (or there is more
+ * than one unsent segment - with lwIP, this can happen although unsent->len < mss)
+ * - or if we are in fast-retransmit (TF_INFR)
+ */
+#define tcp_do_output_nagle(tpcb) ((((tpcb)->unacked == NULL) || \
+ ((tpcb)->flags & (TF_NODELAY | TF_INFR)) || \
+ (((tpcb)->unsent != NULL) && (((tpcb)->unsent->next != NULL) || \
+ ((tpcb)->unsent->len >= (tpcb)->mss))) \
+ ) ? 1 : 0)
+#define tcp_output_nagle(tpcb) (tcp_do_output_nagle(tpcb) ? tcp_output(tpcb) : ERR_OK)
+
+
+#define TCP_SEQ_LT(a,b) ((s32_t)((a)-(b)) < 0)
+#define TCP_SEQ_LEQ(a,b) ((s32_t)((a)-(b)) <= 0)
+#define TCP_SEQ_GT(a,b) ((s32_t)((a)-(b)) > 0)
+#define TCP_SEQ_GEQ(a,b) ((s32_t)((a)-(b)) >= 0)
+/* is b<=a<=c? */
+#if 0 /* see bug #10548 */
+#define TCP_SEQ_BETWEEN(a,b,c) ((c)-(b) >= (a)-(b))
+#endif
+#define TCP_SEQ_BETWEEN(a,b,c) (TCP_SEQ_GEQ(a,b) && TCP_SEQ_LEQ(a,c))
+#define TCP_FIN 0x01U
+#define TCP_SYN 0x02U
+#define TCP_RST 0x04U
+#define TCP_PSH 0x08U
+#define TCP_ACK 0x10U
+#define TCP_URG 0x20U
+#define TCP_ECE 0x40U
+#define TCP_CWR 0x80U
+
+#define TCP_FLAGS 0x3fU
+
+/* Length of the TCP header, excluding options. */
+#define TCP_HLEN 20
+
+#ifndef TCP_TMR_INTERVAL
+#define TCP_TMR_INTERVAL 250 /* The TCP timer interval in milliseconds. */
+#endif /* TCP_TMR_INTERVAL */
+
+#ifndef TCP_FAST_INTERVAL
+#define TCP_FAST_INTERVAL TCP_TMR_INTERVAL /* the fine grained timeout in milliseconds */
+#endif /* TCP_FAST_INTERVAL */
+
+#ifndef TCP_SLOW_INTERVAL
+#define TCP_SLOW_INTERVAL (2*TCP_TMR_INTERVAL) /* the coarse grained timeout in milliseconds */
+#endif /* TCP_SLOW_INTERVAL */
+
+#define TCP_FIN_WAIT_TIMEOUT 20000 /* milliseconds */
+#define TCP_SYN_RCVD_TIMEOUT 20000 /* milliseconds */
+
+#define TCP_OOSEQ_TIMEOUT 6U /* x RTO */
+
+#ifndef TCP_MSL
+#define TCP_MSL 60000UL /* The maximum segment lifetime in milliseconds */
+#endif
+
+/* Keepalive values, compliant with RFC 1122. Don't change this unless you know what you're doing */
+#ifndef TCP_KEEPIDLE_DEFAULT
+#define TCP_KEEPIDLE_DEFAULT 7200000UL /* Default KEEPALIVE timer in milliseconds */
+#endif
+
+#ifndef TCP_KEEPINTVL_DEFAULT
+#define TCP_KEEPINTVL_DEFAULT 75000UL /* Default Time between KEEPALIVE probes in milliseconds */
+#endif
+
+#ifndef TCP_KEEPCNT_DEFAULT
+#define TCP_KEEPCNT_DEFAULT 9U /* Default Counter for KEEPALIVE probes */
+#endif
+
+#define TCP_MAXIDLE TCP_KEEPCNT_DEFAULT * TCP_KEEPINTVL_DEFAULT /* Maximum KEEPALIVE probe time */
+
+/* Fields are (of course) in network byte order.
+ * Some fields are converted to host byte order in tcp_input().
+ */
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+struct tcp_hdr {
+ PACK_STRUCT_FIELD(u16_t src);
+ PACK_STRUCT_FIELD(u16_t dest);
+ PACK_STRUCT_FIELD(u32_t seqno);
+ PACK_STRUCT_FIELD(u32_t ackno);
+ PACK_STRUCT_FIELD(u16_t _hdrlen_rsvd_flags);
+ PACK_STRUCT_FIELD(u16_t wnd);
+ PACK_STRUCT_FIELD(u16_t chksum);
+ PACK_STRUCT_FIELD(u16_t urgp);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+
+#define TCPH_OFFSET(phdr) (ntohs((phdr)->_hdrlen_rsvd_flags) >> 8)
+#define TCPH_HDRLEN(phdr) (ntohs((phdr)->_hdrlen_rsvd_flags) >> 12)
+#define TCPH_FLAGS(phdr) (ntohs((phdr)->_hdrlen_rsvd_flags) & TCP_FLAGS)
+
+#define TCPH_OFFSET_SET(phdr, offset) (phdr)->_hdrlen_rsvd_flags = htons(((offset) << 8) | TCPH_FLAGS(phdr))
+#define TCPH_HDRLEN_SET(phdr, len) (phdr)->_hdrlen_rsvd_flags = htons(((len) << 12) | TCPH_FLAGS(phdr))
+#define TCPH_FLAGS_SET(phdr, flags) (phdr)->_hdrlen_rsvd_flags = (((phdr)->_hdrlen_rsvd_flags & PP_HTONS((u16_t)(~(u16_t)(TCP_FLAGS)))) | htons(flags))
+#define TCPH_HDRLEN_FLAGS_SET(phdr, len, flags) (phdr)->_hdrlen_rsvd_flags = htons(((len) << 12) | (flags))
+
+#define TCPH_SET_FLAG(phdr, flags ) (phdr)->_hdrlen_rsvd_flags = ((phdr)->_hdrlen_rsvd_flags | htons(flags))
+#define TCPH_UNSET_FLAG(phdr, flags) (phdr)->_hdrlen_rsvd_flags = htons(ntohs((phdr)->_hdrlen_rsvd_flags) | (TCPH_FLAGS(phdr) & ~(flags)) )
+
+#define TCP_TCPLEN(seg) ((seg)->len + ((TCPH_FLAGS((seg)->tcphdr) & (TCP_FIN | TCP_SYN)) != 0))
+
+/** Flags used on input processing, not on pcb->flags
+*/
+#define TF_RESET (u8_t)0x08U /* Connection was reset. */
+#define TF_CLOSED (u8_t)0x10U /* Connection was sucessfully closed. */
+#define TF_GOT_FIN (u8_t)0x20U /* Connection was closed by the remote end. */
+
+
+#if LWIP_EVENT_API
+
+#define TCP_EVENT_ACCEPT(pcb,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
+ LWIP_EVENT_ACCEPT, NULL, 0, err)
+#define TCP_EVENT_SENT(pcb,space,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
+ LWIP_EVENT_SENT, NULL, space, ERR_OK)
+#define TCP_EVENT_RECV(pcb,p,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
+ LWIP_EVENT_RECV, (p), 0, (err))
+#define TCP_EVENT_CLOSED(pcb,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
+ LWIP_EVENT_RECV, NULL, 0, ERR_OK)
+#define TCP_EVENT_CONNECTED(pcb,err,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
+ LWIP_EVENT_CONNECTED, NULL, 0, (err))
+#define TCP_EVENT_POLL(pcb,ret) ret = lwip_tcp_event((pcb)->callback_arg, (pcb),\
+ LWIP_EVENT_POLL, NULL, 0, ERR_OK)
+#define TCP_EVENT_ERR(errf,arg,err) lwip_tcp_event((arg), NULL, \
+ LWIP_EVENT_ERR, NULL, 0, (err))
+
+#else /* LWIP_EVENT_API */
+
+#define TCP_EVENT_ACCEPT(pcb,err,ret) \
+ do { \
+ if((pcb)->accept != NULL) \
+ (ret) = (pcb)->accept((pcb)->callback_arg,(pcb),(err)); \
+ else (ret) = ERR_ARG; \
+ } while (0)
+
+#define TCP_EVENT_SENT(pcb,space,ret) \
+ do { \
+ if((pcb)->sent != NULL) \
+ (ret) = (pcb)->sent((pcb)->callback_arg,(pcb),(space)); \
+ else (ret) = ERR_OK; \
+ } while (0)
+
+#define TCP_EVENT_RECV(pcb,p,err,ret) \
+ do { \
+ if((pcb)->recv != NULL) { \
+ (ret) = (pcb)->recv((pcb)->callback_arg,(pcb),(p),(err));\
+ } else { \
+ (ret) = tcp_recv_null(NULL, (pcb), (p), (err)); \
+ } \
+ } while (0)
+
+#define TCP_EVENT_CLOSED(pcb,ret) \
+ do { \
+ if(((pcb)->recv != NULL)) { \
+ (ret) = (pcb)->recv((pcb)->callback_arg,(pcb),NULL,ERR_OK);\
+ } else { \
+ (ret) = ERR_OK; \
+ } \
+ } while (0)
+
+#define TCP_EVENT_CONNECTED(pcb,err,ret) \
+ do { \
+ if((pcb)->connected != NULL) \
+ (ret) = (pcb)->connected((pcb)->callback_arg,(pcb),(err)); \
+ else (ret) = ERR_OK; \
+ } while (0)
+
+#define TCP_EVENT_POLL(pcb,ret) \
+ do { \
+ if((pcb)->poll != NULL) \
+ (ret) = (pcb)->poll((pcb)->callback_arg,(pcb)); \
+ else (ret) = ERR_OK; \
+ } while (0)
+
+#define TCP_EVENT_ERR(errf,arg,err) \
+ do { \
+ if((errf) != NULL) \
+ (errf)((arg),(err)); \
+ } while (0)
+
+#endif /* LWIP_EVENT_API */
+
+/** Enabled extra-check for TCP_OVERSIZE if LWIP_DEBUG is enabled */
+#if TCP_OVERSIZE && defined(LWIP_DEBUG)
+#define TCP_OVERSIZE_DBGCHECK 1
+#else
+#define TCP_OVERSIZE_DBGCHECK 0
+#endif
+
+/** Don't generate checksum on copy if CHECKSUM_GEN_TCP is disabled */
+#define TCP_CHECKSUM_ON_COPY (LWIP_CHECKSUM_ON_COPY && CHECKSUM_GEN_TCP)
+
+/* This structure represents a TCP segment on the unsent, unacked and ooseq queues */
+struct tcp_seg {
+ struct tcp_seg *next; /* used when putting segements on a queue */
+ struct pbuf *p; /* buffer containing data + TCP header */
+ u16_t len; /* the TCP length of this segment */
+#if TCP_OVERSIZE_DBGCHECK
+ u16_t oversize_left; /* Extra bytes available at the end of the last
+ pbuf in unsent (used for asserting vs.
+ tcp_pcb.unsent_oversized only) */
+#endif /* TCP_OVERSIZE_DBGCHECK */
+#if TCP_CHECKSUM_ON_COPY
+ u16_t chksum;
+ u8_t chksum_swapped;
+#endif /* TCP_CHECKSUM_ON_COPY */
+ u8_t flags;
+#define TF_SEG_OPTS_MSS (u8_t)0x01U /* Include MSS option. */
+#define TF_SEG_OPTS_TS (u8_t)0x02U /* Include timestamp option. */
+#define TF_SEG_DATA_CHECKSUMMED (u8_t)0x04U /* ALL data (not the header) is
+ checksummed into 'chksum' */
+ struct tcp_hdr *tcphdr; /* the TCP header */
+};
+
+#define LWIP_TCP_OPT_LENGTH(flags) \
+ (flags & TF_SEG_OPTS_MSS ? 4 : 0) + \
+ (flags & TF_SEG_OPTS_TS ? 12 : 0)
+
+/** This returns a TCP header option for MSS in an u32_t */
+#define TCP_BUILD_MSS_OPTION(x) (x) = PP_HTONL(((u32_t)2 << 24) | \
+ ((u32_t)4 << 16) | \
+ (((u32_t)TCP_MSS / 256) << 8) | \
+ (TCP_MSS & 255))
+
+/* Global variables: */
+extern struct tcp_pcb *tcp_input_pcb;
+extern u32_t tcp_ticks;
+
+/* The TCP PCB lists. */
+union tcp_listen_pcbs_t { /* List of all TCP PCBs in LISTEN state. */
+ struct tcp_pcb_listen *listen_pcbs;
+ struct tcp_pcb *pcbs;
+};
+extern struct tcp_pcb *tcp_bound_pcbs;
+extern union tcp_listen_pcbs_t tcp_listen_pcbs;
+extern struct tcp_pcb *tcp_active_pcbs; /* List of all TCP PCBs that are in a
+ state in which they accept or send
+ data. */
+extern struct tcp_pcb *tcp_tw_pcbs; /* List of all TCP PCBs in TIME-WAIT. */
+
+extern struct tcp_pcb *tcp_tmp_pcb; /* Only used for temporary storage. */
+
+/* Axioms about the above lists:
+ 1) Every TCP PCB that is not CLOSED is in one of the lists.
+ 2) A PCB is only in one of the lists.
+ 3) All PCBs in the tcp_listen_pcbs list is in LISTEN state.
+ 4) All PCBs in the tcp_tw_pcbs list is in TIME-WAIT state.
+*/
+/* Define two macros, TCP_REG and TCP_RMV that registers a TCP PCB
+ with a PCB list or removes a PCB from a list, respectively. */
+#ifndef TCP_DEBUG_PCB_LISTS
+#define TCP_DEBUG_PCB_LISTS 0
+#endif
+#if TCP_DEBUG_PCB_LISTS
+#define TCP_REG(pcbs, npcb) do {\
+ LWIP_DEBUGF(TCP_DEBUG, ("TCP_REG %p local port %d\n", (npcb), (npcb)->local_port)); \
+ for(tcp_tmp_pcb = *(pcbs); \
+ tcp_tmp_pcb != NULL; \
+ tcp_tmp_pcb = tcp_tmp_pcb->next) { \
+ LWIP_ASSERT("TCP_REG: already registered\n", tcp_tmp_pcb != (npcb)); \
+ } \
+ LWIP_ASSERT("TCP_REG: pcb->state != CLOSED", ((pcbs) == &tcp_bound_pcbs) || ((npcb)->state != CLOSED)); \
+ (npcb)->next = *(pcbs); \
+ LWIP_ASSERT("TCP_REG: npcb->next != npcb", (npcb)->next != (npcb)); \
+ *(pcbs) = (npcb); \
+ LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \
+ tcp_timer_needed(); \
+ } while(0)
+#define TCP_RMV(pcbs, npcb) do { \
+ LWIP_ASSERT("TCP_RMV: pcbs != NULL", *(pcbs) != NULL); \
+ LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removing %p from %p\n", (npcb), *(pcbs))); \
+ if(*(pcbs) == (npcb)) { \
+ *(pcbs) = (*pcbs)->next; \
+ } else for(tcp_tmp_pcb = *(pcbs); tcp_tmp_pcb != NULL; tcp_tmp_pcb = tcp_tmp_pcb->next) { \
+ if(tcp_tmp_pcb->next == (npcb)) { \
+ tcp_tmp_pcb->next = (npcb)->next; \
+ break; \
+ } \
+ } \
+ (npcb)->next = NULL; \
+ LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane()); \
+ LWIP_DEBUGF(TCP_DEBUG, ("TCP_RMV: removed %p from %p\n", (npcb), *(pcbs))); \
+ } while(0)
+
+#else /* LWIP_DEBUG */
+
+#define TCP_REG(pcbs, npcb) \
+ do { \
+ (npcb)->next = *pcbs; \
+ *(pcbs) = (npcb); \
+ tcp_timer_needed(); \
+ } while (0)
+
+#define TCP_RMV(pcbs, npcb) \
+ do { \
+ if(*(pcbs) == (npcb)) { \
+ (*(pcbs)) = (*pcbs)->next; \
+ } \
+ else { \
+ for(tcp_tmp_pcb = *pcbs; \
+ tcp_tmp_pcb != NULL; \
+ tcp_tmp_pcb = tcp_tmp_pcb->next) { \
+ if(tcp_tmp_pcb->next == (npcb)) { \
+ tcp_tmp_pcb->next = (npcb)->next; \
+ break; \
+ } \
+ } \
+ } \
+ (npcb)->next = NULL; \
+ } while(0)
+
+#endif /* LWIP_DEBUG */
+
+
+/* Internal functions: */
+struct tcp_pcb *tcp_pcb_copy(struct tcp_pcb *pcb);
+void tcp_pcb_purge(struct tcp_pcb *pcb);
+void tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb);
+
+void tcp_segs_free(struct tcp_seg *seg);
+void tcp_seg_free(struct tcp_seg *seg);
+struct tcp_seg *tcp_seg_copy(struct tcp_seg *seg);
+
+#define tcp_ack(pcb) \
+ do { \
+ if((pcb)->flags & TF_ACK_DELAY) { \
+ (pcb)->flags &= ~TF_ACK_DELAY; \
+ (pcb)->flags |= TF_ACK_NOW; \
+ } \
+ else { \
+ (pcb)->flags |= TF_ACK_DELAY; \
+ } \
+ } while (0)
+
+#define tcp_ack_now(pcb) \
+ do { \
+ (pcb)->flags |= TF_ACK_NOW; \
+ } while (0)
+
+err_t tcp_send_fin(struct tcp_pcb *pcb);
+err_t tcp_enqueue_flags(struct tcp_pcb *pcb, u8_t flags);
+
+void tcp_rexmit_seg(struct tcp_pcb *pcb, struct tcp_seg *seg);
+
+void tcp_rst(u32_t seqno, u32_t ackno,
+ ip_addr_t *local_ip, ip_addr_t *remote_ip,
+ u16_t local_port, u16_t remote_port);
+
+u32_t tcp_next_iss(void);
+
+void tcp_keepalive(struct tcp_pcb *pcb);
+void tcp_zero_window_probe(struct tcp_pcb *pcb);
+
+#if TCP_CALCULATE_EFF_SEND_MSS
+u16_t tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr);
+#endif /* TCP_CALCULATE_EFF_SEND_MSS */
+
+#if LWIP_CALLBACK_API
+err_t tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err);
+#endif /* LWIP_CALLBACK_API */
+
+#if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
+void tcp_debug_print(struct tcp_hdr *tcphdr);
+void tcp_debug_print_flags(u8_t flags);
+void tcp_debug_print_state(enum tcp_state s);
+void tcp_debug_print_pcbs(void);
+s16_t tcp_pcbs_sane(void);
+#else
+# define tcp_debug_print(tcphdr)
+# define tcp_debug_print_flags(flags)
+# define tcp_debug_print_state(s)
+# define tcp_debug_print_pcbs()
+# define tcp_pcbs_sane() 1
+#endif /* TCP_DEBUG */
+
+/** External function (implemented in timers.c), called when TCP detects
+ * that a timer is needed (i.e. active- or time-wait-pcb found). */
+void tcp_timer_needed(void);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_TCP */
+
+#endif /* __LWIP_TCP_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_TCPIP_H__
+#define __LWIP_TCPIP_H__
+
+#include "lwip/opt.h"
+
+#if !NO_SYS /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/api_msg.h"
+#include "lwip/netifapi.h"
+#include "lwip/pbuf.h"
+#include "lwip/api.h"
+#include "lwip/sys.h"
+#include "lwip/timers.h"
+#include "lwip/netif.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Define this to something that triggers a watchdog. This is called from
+ * tcpip_thread after processing a message. */
+#ifndef LWIP_TCPIP_THREAD_ALIVE
+#define LWIP_TCPIP_THREAD_ALIVE()
+#endif
+
+#if LWIP_TCPIP_CORE_LOCKING
+/** The global semaphore to lock the stack. */
+extern sys_mutex_t lock_tcpip_core;
+#define LOCK_TCPIP_CORE() sys_mutex_lock(&lock_tcpip_core)
+#define UNLOCK_TCPIP_CORE() sys_mutex_unlock(&lock_tcpip_core)
+#define TCPIP_APIMSG(m) tcpip_apimsg_lock(m)
+#define TCPIP_APIMSG_ACK(m)
+#define TCPIP_NETIFAPI(m) tcpip_netifapi_lock(m)
+#define TCPIP_NETIFAPI_ACK(m)
+#else /* LWIP_TCPIP_CORE_LOCKING */
+#define LOCK_TCPIP_CORE()
+#define UNLOCK_TCPIP_CORE()
+#define TCPIP_APIMSG(m) tcpip_apimsg(m)
+#define TCPIP_APIMSG_ACK(m) sys_sem_signal(&m->conn->op_completed)
+#define TCPIP_NETIFAPI(m) tcpip_netifapi(m)
+#define TCPIP_NETIFAPI_ACK(m) sys_sem_signal(&m->sem)
+#endif /* LWIP_TCPIP_CORE_LOCKING */
+
+/** Function prototype for the init_done function passed to tcpip_init */
+typedef void (*tcpip_init_done_fn)(void *arg);
+/** Function prototype for functions passed to tcpip_callback() */
+typedef void (*tcpip_callback_fn)(void *ctx);
+
+void tcpip_init(tcpip_init_done_fn tcpip_init_done, void *arg);
+
+#if LWIP_NETCONN
+err_t tcpip_apimsg(struct api_msg *apimsg);
+#if LWIP_TCPIP_CORE_LOCKING
+err_t tcpip_apimsg_lock(struct api_msg *apimsg);
+#endif /* LWIP_TCPIP_CORE_LOCKING */
+#endif /* LWIP_NETCONN */
+
+err_t tcpip_input(struct pbuf *p, struct netif *inp);
+
+#if LWIP_NETIF_API
+err_t tcpip_netifapi(struct netifapi_msg *netifapimsg);
+#if LWIP_TCPIP_CORE_LOCKING
+err_t tcpip_netifapi_lock(struct netifapi_msg *netifapimsg);
+#endif /* LWIP_TCPIP_CORE_LOCKING */
+#endif /* LWIP_NETIF_API */
+
+err_t tcpip_callback_with_block(tcpip_callback_fn function, void *ctx, u8_t block);
+#define tcpip_callback(f, ctx) tcpip_callback_with_block(f, ctx, 1)
+
+/* free pbufs or heap memory from another context without blocking */
+err_t pbuf_free_callback(struct pbuf *p);
+err_t mem_free_callback(void *m);
+
+#if LWIP_TCPIP_TIMEOUT
+err_t tcpip_timeout(u32_t msecs, sys_timeout_handler h, void *arg);
+err_t tcpip_untimeout(sys_timeout_handler h, void *arg);
+#endif /* LWIP_TCPIP_TIMEOUT */
+
+enum tcpip_msg_type {
+#if LWIP_NETCONN
+ TCPIP_MSG_API,
+#endif /* LWIP_NETCONN */
+ TCPIP_MSG_INPKT,
+#if LWIP_NETIF_API
+ TCPIP_MSG_NETIFAPI,
+#endif /* LWIP_NETIF_API */
+#if LWIP_TCPIP_TIMEOUT
+ TCPIP_MSG_TIMEOUT,
+ TCPIP_MSG_UNTIMEOUT,
+#endif /* LWIP_TCPIP_TIMEOUT */
+ TCPIP_MSG_CALLBACK
+};
+
+struct tcpip_msg {
+ enum tcpip_msg_type type;
+ sys_sem_t *sem;
+ union {
+#if LWIP_NETCONN
+ struct api_msg *apimsg;
+#endif /* LWIP_NETCONN */
+#if LWIP_NETIF_API
+ struct netifapi_msg *netifapimsg;
+#endif /* LWIP_NETIF_API */
+ struct {
+ struct pbuf *p;
+ struct netif *netif;
+ } inp;
+ struct {
+ tcpip_callback_fn function;
+ void *ctx;
+ } cb;
+#if LWIP_TCPIP_TIMEOUT
+ struct {
+ u32_t msecs;
+ sys_timeout_handler h;
+ void *arg;
+ } tmo;
+#endif /* LWIP_TCPIP_TIMEOUT */
+ } msg;
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* !NO_SYS */
+
+#endif /* __LWIP_TCPIP_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ * Simon Goldschmidt
+ *
+ */
+#ifndef __LWIP_TIMERS_H__
+#define __LWIP_TIMERS_H__
+
+#include "lwip/opt.h"
+
+/* Timers are not supported when NO_SYS==1 and NO_SYS_NO_TIMERS==1 */
+#define LWIP_TIMERS (!NO_SYS || (NO_SYS && !NO_SYS_NO_TIMERS))
+
+#if LWIP_TIMERS
+
+#include "lwip/err.h"
+#include "lwip/sys.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef LWIP_DEBUG_TIMERNAMES
+#ifdef LWIP_DEBUG
+#define LWIP_DEBUG_TIMERNAMES SYS_DEBUG
+#else /* LWIP_DEBUG */
+#define LWIP_DEBUG_TIMERNAMES 0
+#endif /* LWIP_DEBUG*/
+#endif
+
+/** Function prototype for a timeout callback function. Register such a function
+ * using sys_timeout().
+ *
+ * @param arg Additional argument to pass to the function - set up by sys_timeout()
+ */
+typedef void (* sys_timeout_handler)(void *arg);
+
+struct sys_timeo {
+ struct sys_timeo *next;
+ u32_t time;
+ sys_timeout_handler h;
+ void *arg;
+#if LWIP_DEBUG_TIMERNAMES
+ const char* handler_name;
+#endif /* LWIP_DEBUG_TIMERNAMES */
+};
+
+void sys_timeouts_init(void);
+
+#if LWIP_DEBUG_TIMERNAMES
+void sys_timeout_debug(u32_t msecs, sys_timeout_handler handler, void *arg, const char* handler_name);
+#define sys_timeout(msecs, handler, arg) sys_timeout_debug(msecs, handler, arg, #handler)
+#else /* LWIP_DEBUG_TIMERNAMES */
+void sys_timeout(u32_t msecs, sys_timeout_handler handler, void *arg);
+#endif /* LWIP_DEBUG_TIMERNAMES */
+
+void sys_untimeout(sys_timeout_handler handler, void *arg);
+#if NO_SYS
+void sys_check_timeouts(void);
+void sys_restart_timeouts(void);
+#else /* NO_SYS */
+void sys_timeouts_mbox_fetch(sys_mbox_t *mbox, void **msg);
+#endif /* NO_SYS */
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_TIMERS */
+#endif /* __LWIP_TIMERS_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_UDP_H__
+#define __LWIP_UDP_H__
+
+#include "lwip/opt.h"
+
+#if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/pbuf.h"
+#include "lwip/netif.h"
+#include "lwip/ip_addr.h"
+#include "lwip/ip.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define UDP_HLEN 8
+
+/* Fields are (of course) in network byte order. */
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+struct udp_hdr {
+ PACK_STRUCT_FIELD(u16_t src);
+ PACK_STRUCT_FIELD(u16_t dest); /* src/dest UDP ports */
+ PACK_STRUCT_FIELD(u16_t len);
+ PACK_STRUCT_FIELD(u16_t chksum);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+
+#define UDP_FLAGS_NOCHKSUM 0x01U
+#define UDP_FLAGS_UDPLITE 0x02U
+#define UDP_FLAGS_CONNECTED 0x04U
+#define UDP_FLAGS_MULTICAST_LOOP 0x08U
+
+struct udp_pcb;
+
+/** Function prototype for udp pcb receive callback functions
+ * addr and port are in same byte order as in the pcb
+ * The callback is responsible for freeing the pbuf
+ * if it's not used any more.
+ *
+ * ATTENTION: Be aware that 'addr' points into the pbuf 'p' so freeing this pbuf
+ * makes 'addr' invalid, too.
+ *
+ * @param arg user supplied argument (udp_pcb.recv_arg)
+ * @param pcb the udp_pcb which received data
+ * @param p the packet buffer that was received
+ * @param addr the remote IP address from which the packet was received
+ * @param port the remote port from which the packet was received
+ */
+typedef void (*udp_recv_fn)(void *arg, struct udp_pcb *pcb, struct pbuf *p,
+ ip_addr_t *addr, u16_t port);
+
+
+struct udp_pcb {
+/* Common members of all PCB types */
+ IP_PCB;
+
+/* Protocol specific PCB members */
+
+ struct udp_pcb *next;
+
+ u8_t flags;
+ /** ports are in host byte order */
+ u16_t local_port, remote_port;
+
+#if LWIP_IGMP
+ /** outgoing network interface for multicast packets */
+ ip_addr_t multicast_ip;
+#endif /* LWIP_IGMP */
+
+#if LWIP_UDPLITE
+ /** used for UDP_LITE only */
+ u16_t chksum_len_rx, chksum_len_tx;
+#endif /* LWIP_UDPLITE */
+
+ /** receive callback function */
+ udp_recv_fn recv;
+ /** user-supplied argument for the recv callback */
+ void *recv_arg;
+};
+/* udp_pcbs export for exernal reference (e.g. SNMP agent) */
+extern struct udp_pcb *udp_pcbs;
+
+/* The following functions is the application layer interface to the
+ UDP code. */
+struct udp_pcb * udp_new (void);
+void udp_remove (struct udp_pcb *pcb);
+err_t udp_bind (struct udp_pcb *pcb, ip_addr_t *ipaddr,
+ u16_t port);
+err_t udp_connect (struct udp_pcb *pcb, ip_addr_t *ipaddr,
+ u16_t port);
+void udp_disconnect (struct udp_pcb *pcb);
+void udp_recv (struct udp_pcb *pcb, udp_recv_fn recv,
+ void *recv_arg);
+err_t udp_sendto_if (struct udp_pcb *pcb, struct pbuf *p,
+ ip_addr_t *dst_ip, u16_t dst_port,
+ struct netif *netif);
+err_t udp_sendto (struct udp_pcb *pcb, struct pbuf *p,
+ ip_addr_t *dst_ip, u16_t dst_port);
+err_t udp_send (struct udp_pcb *pcb, struct pbuf *p);
+
+#if LWIP_CHECKSUM_ON_COPY
+err_t udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p,
+ ip_addr_t *dst_ip, u16_t dst_port,
+ struct netif *netif, u8_t have_chksum,
+ u16_t chksum);
+err_t udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p,
+ ip_addr_t *dst_ip, u16_t dst_port,
+ u8_t have_chksum, u16_t chksum);
+err_t udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
+ u8_t have_chksum, u16_t chksum);
+#endif /* LWIP_CHECKSUM_ON_COPY */
+
+#define udp_flags(pcb) ((pcb)->flags)
+#define udp_setflags(pcb, f) ((pcb)->flags = (f))
+
+/* The following functions are the lower layer interface to UDP. */
+void udp_input (struct pbuf *p, struct netif *inp);
+
+#define udp_init() /* Compatibility define, not init needed. */
+
+#if UDP_DEBUG
+void udp_debug_print(struct udp_hdr *udphdr);
+#else
+#define udp_debug_print(udphdr)
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_UDP */
+
+#endif /* __LWIP_UDP_H__ */
--- /dev/null
+/*
+ * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
+ * Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
+ * Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#ifndef __NETIF_ETHARP_H__
+#define __NETIF_ETHARP_H__
+
+#include "lwip/opt.h"
+
+#if LWIP_ARP || LWIP_ETHERNET /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/pbuf.h"
+#include "lwip/ip_addr.h"
+#include "lwip/netif.h"
+#include "lwip/ip.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef ETHARP_HWADDR_LEN
+#define ETHARP_HWADDR_LEN 6
+#endif
+
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+struct eth_addr {
+ PACK_STRUCT_FIELD(u8_t addr[ETHARP_HWADDR_LEN]);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+/** Ethernet header */
+struct eth_hdr {
+#if ETH_PAD_SIZE
+ PACK_STRUCT_FIELD(u8_t padding[ETH_PAD_SIZE]);
+#endif
+ PACK_STRUCT_FIELD(struct eth_addr dest);
+ PACK_STRUCT_FIELD(struct eth_addr src);
+ PACK_STRUCT_FIELD(u16_t type);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+
+#define SIZEOF_ETH_HDR (14 + ETH_PAD_SIZE)
+
+#if ETHARP_SUPPORT_VLAN
+
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+/** VLAN header inserted between ethernet header and payload
+ * if 'type' in ethernet header is ETHTYPE_VLAN.
+ * See IEEE802.Q */
+struct eth_vlan_hdr {
+ PACK_STRUCT_FIELD(u16_t prio_vid);
+ PACK_STRUCT_FIELD(u16_t tpid);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+
+#define SIZEOF_VLAN_HDR 4
+#define VLAN_ID(vlan_hdr) (htons((vlan_hdr)->prio_vid) & 0xFFF)
+
+#endif /* ETHARP_SUPPORT_VLAN */
+
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+/** the ARP message, see RFC 826 ("Packet format") */
+struct etharp_hdr {
+ PACK_STRUCT_FIELD(u16_t hwtype);
+ PACK_STRUCT_FIELD(u16_t proto);
+ PACK_STRUCT_FIELD(u8_t hwlen);
+ PACK_STRUCT_FIELD(u8_t protolen);
+ PACK_STRUCT_FIELD(u16_t opcode);
+ PACK_STRUCT_FIELD(struct eth_addr shwaddr);
+ PACK_STRUCT_FIELD(struct ip_addr2 sipaddr);
+ PACK_STRUCT_FIELD(struct eth_addr dhwaddr);
+ PACK_STRUCT_FIELD(struct ip_addr2 dipaddr);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+
+#define SIZEOF_ETHARP_HDR 28
+#define SIZEOF_ETHARP_PACKET (SIZEOF_ETH_HDR + SIZEOF_ETHARP_HDR)
+
+/** 5 seconds period */
+#define ARP_TMR_INTERVAL 5000
+
+#define ETHTYPE_ARP 0x0806U
+#define ETHTYPE_IP 0x0800U
+#define ETHTYPE_VLAN 0x8100U
+#define ETHTYPE_PPPOEDISC 0x8863U /* PPP Over Ethernet Discovery Stage */
+#define ETHTYPE_PPPOE 0x8864U /* PPP Over Ethernet Session Stage */
+
+/** MEMCPY-like macro to copy to/from struct eth_addr's that are local variables
+ * or known to be 32-bit aligned within the protocol header. */
+#ifndef ETHADDR32_COPY
+#define ETHADDR32_COPY(src, dst) SMEMCPY(src, dst, ETHARP_HWADDR_LEN)
+#endif
+
+/** MEMCPY-like macro to copy to/from struct eth_addr's that are no local
+ * variables and known to be 16-bit aligned within the protocol header. */
+#ifndef ETHADDR16_COPY
+#define ETHADDR16_COPY(src, dst) SMEMCPY(src, dst, ETHARP_HWADDR_LEN)
+#endif
+
+#if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
+
+/** ARP message types (opcodes) */
+#define ARP_REQUEST 1
+#define ARP_REPLY 2
+
+/** Define this to 1 and define LWIP_ARP_FILTER_NETIF_FN(pbuf, netif, type)
+ * to a filter function that returns the correct netif when using multiple
+ * netifs on one hardware interface where the netif's low-level receive
+ * routine cannot decide for the correct netif (e.g. when mapping multiple
+ * IP addresses to one hardware interface).
+ */
+#ifndef LWIP_ARP_FILTER_NETIF
+#define LWIP_ARP_FILTER_NETIF 0
+#endif
+
+#if ARP_QUEUEING
+/** struct for queueing outgoing packets for unknown address
+ * defined here to be accessed by memp.h
+ */
+struct etharp_q_entry {
+ struct etharp_q_entry *next;
+ struct pbuf *p;
+};
+#endif /* ARP_QUEUEING */
+
+#define etharp_init() /* Compatibility define, not init needed. */
+void etharp_tmr(void);
+s8_t etharp_find_addr(struct netif *netif, ip_addr_t *ipaddr,
+ struct eth_addr **eth_ret, ip_addr_t **ip_ret);
+err_t etharp_output(struct netif *netif, struct pbuf *q, ip_addr_t *ipaddr);
+err_t etharp_query(struct netif *netif, ip_addr_t *ipaddr, struct pbuf *q);
+err_t etharp_request(struct netif *netif, ip_addr_t *ipaddr);
+/** For Ethernet network interfaces, we might want to send "gratuitous ARP";
+ * this is an ARP packet sent by a node in order to spontaneously cause other
+ * nodes to update an entry in their ARP cache.
+ * From RFC 3220 "IP Mobility Support for IPv4" section 4.6. */
+#define etharp_gratuitous(netif) etharp_request((netif), &(netif)->ip_addr)
+
+#if ETHARP_SUPPORT_STATIC_ENTRIES
+err_t etharp_add_static_entry(ip_addr_t *ipaddr, struct eth_addr *ethaddr);
+err_t etharp_remove_static_entry(ip_addr_t *ipaddr);
+#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
+
+#if LWIP_AUTOIP
+err_t etharp_raw(struct netif *netif, const struct eth_addr *ethsrc_addr,
+ const struct eth_addr *ethdst_addr,
+ const struct eth_addr *hwsrc_addr, const ip_addr_t *ipsrc_addr,
+ const struct eth_addr *hwdst_addr, const ip_addr_t *ipdst_addr,
+ const u16_t opcode);
+#endif /* LWIP_AUTOIP */
+
+#endif /* LWIP_ARP */
+
+err_t ethernet_input(struct pbuf *p, struct netif *netif);
+
+#define eth_addr_cmp(addr1, addr2) (memcmp((addr1)->addr, (addr2)->addr, ETHARP_HWADDR_LEN) == 0)
+
+extern const struct eth_addr ethbroadcast, ethzero;
+
+#endif /* LWIP_ARP || LWIP_ETHERNET */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __NETIF_ARP_H__ */
--- /dev/null
+/*****************************************************************************
+* ppp_oe.h - PPP Over Ethernet implementation for lwIP.
+*
+* Copyright (c) 2006 by Marc Boucher, Services Informatiques (MBSI) inc.
+*
+* The authors hereby grant permission to use, copy, modify, distribute,
+* and license this software and its documentation for any purpose, provided
+* that existing copyright notices are retained in all copies and that this
+* notice and the following disclaimer are included verbatim in any
+* distributions. No written agreement, license, or royalty fee is required
+* for any of the authorized uses.
+*
+* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
+* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+* IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*
+******************************************************************************
+* REVISION HISTORY
+*
+* 06-01-01 Marc Boucher <marc@mbsi.ca>
+* Ported to lwIP.
+*****************************************************************************/
+
+
+
+/* based on NetBSD: if_pppoe.c,v 1.64 2006/01/31 23:50:15 martin Exp */
+
+/*-
+ * Copyright (c) 2002 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Martin Husemann <martin@NetBSD.org>.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the NetBSD
+ * Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef PPP_OE_H
+#define PPP_OE_H
+
+#include "lwip/opt.h"
+
+#if PPPOE_SUPPORT > 0
+
+#include "netif/etharp.h"
+
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+struct pppoehdr {
+ PACK_STRUCT_FIELD(u8_t vertype);
+ PACK_STRUCT_FIELD(u8_t code);
+ PACK_STRUCT_FIELD(u16_t session);
+ PACK_STRUCT_FIELD(u16_t plen);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+struct pppoetag {
+ PACK_STRUCT_FIELD(u16_t tag);
+ PACK_STRUCT_FIELD(u16_t len);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+
+
+#define PPPOE_STATE_INITIAL 0
+#define PPPOE_STATE_PADI_SENT 1
+#define PPPOE_STATE_PADR_SENT 2
+#define PPPOE_STATE_SESSION 3
+#define PPPOE_STATE_CLOSING 4
+/* passive */
+#define PPPOE_STATE_PADO_SENT 1
+
+#define PPPOE_HEADERLEN sizeof(struct pppoehdr)
+#define PPPOE_VERTYPE 0x11 /* VER=1, TYPE = 1 */
+
+#define PPPOE_TAG_EOL 0x0000 /* end of list */
+#define PPPOE_TAG_SNAME 0x0101 /* service name */
+#define PPPOE_TAG_ACNAME 0x0102 /* access concentrator name */
+#define PPPOE_TAG_HUNIQUE 0x0103 /* host unique */
+#define PPPOE_TAG_ACCOOKIE 0x0104 /* AC cookie */
+#define PPPOE_TAG_VENDOR 0x0105 /* vendor specific */
+#define PPPOE_TAG_RELAYSID 0x0110 /* relay session id */
+#define PPPOE_TAG_SNAME_ERR 0x0201 /* service name error */
+#define PPPOE_TAG_ACSYS_ERR 0x0202 /* AC system error */
+#define PPPOE_TAG_GENERIC_ERR 0x0203 /* gerneric error */
+
+#define PPPOE_CODE_PADI 0x09 /* Active Discovery Initiation */
+#define PPPOE_CODE_PADO 0x07 /* Active Discovery Offer */
+#define PPPOE_CODE_PADR 0x19 /* Active Discovery Request */
+#define PPPOE_CODE_PADS 0x65 /* Active Discovery Session confirmation */
+#define PPPOE_CODE_PADT 0xA7 /* Active Discovery Terminate */
+
+#ifndef ETHERMTU
+#define ETHERMTU 1500
+#endif
+
+/* two byte PPP protocol discriminator, then IP data */
+#define PPPOE_MAXMTU (ETHERMTU-PPPOE_HEADERLEN-2)
+
+#ifndef PPPOE_MAX_AC_COOKIE_LEN
+#define PPPOE_MAX_AC_COOKIE_LEN 64
+#endif
+
+struct pppoe_softc {
+ struct pppoe_softc *next;
+ struct netif *sc_ethif; /* ethernet interface we are using */
+ int sc_pd; /* ppp unit number */
+ void (*sc_linkStatusCB)(int pd, int up);
+
+ int sc_state; /* discovery phase or session connected */
+ struct eth_addr sc_dest; /* hardware address of concentrator */
+ u16_t sc_session; /* PPPoE session id */
+
+#ifdef PPPOE_TODO
+ char *sc_service_name; /* if != NULL: requested name of service */
+ char *sc_concentrator_name; /* if != NULL: requested concentrator id */
+#endif /* PPPOE_TODO */
+ u8_t sc_ac_cookie[PPPOE_MAX_AC_COOKIE_LEN]; /* content of AC cookie we must echo back */
+ size_t sc_ac_cookie_len; /* length of cookie data */
+#ifdef PPPOE_SERVER
+ u8_t *sc_hunique; /* content of host unique we must echo back */
+ size_t sc_hunique_len; /* length of host unique */
+#endif
+ int sc_padi_retried; /* number of PADI retries already done */
+ int sc_padr_retried; /* number of PADR retries already done */
+};
+
+
+#define pppoe_init() /* compatibility define, no initialization needed */
+
+err_t pppoe_create(struct netif *ethif, int pd, void (*linkStatusCB)(int pd, int up), struct pppoe_softc **scptr);
+err_t pppoe_destroy(struct netif *ifp);
+
+int pppoe_connect(struct pppoe_softc *sc);
+void pppoe_disconnect(struct pppoe_softc *sc);
+
+void pppoe_disc_input(struct netif *netif, struct pbuf *p);
+void pppoe_data_input(struct netif *netif, struct pbuf *p);
+
+err_t pppoe_xmit(struct pppoe_softc *sc, struct pbuf *pb);
+
+/** used in ppp.c */
+#define PPPOE_HDRLEN (sizeof(struct eth_hdr) + PPPOE_HEADERLEN)
+
+#endif /* PPPOE_SUPPORT */
+
+#endif /* PPP_OE_H */
--- /dev/null
+/*
+ * Copyright (c) 2001, Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __NETIF_SLIPIF_H__
+#define __NETIF_SLIPIF_H__
+
+#include "lwip/netif.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+err_t slipif_init(struct netif * netif);
+void slipif_poll(struct netif *netif);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
--- /dev/null
+/**
+ * @file
+ * Address Resolution Protocol module for IP over Ethernet
+ *
+ * Functionally, ARP is divided into two parts. The first maps an IP address
+ * to a physical address when sending a packet, and the second part answers
+ * requests from other machines for our physical address.
+ *
+ * This implementation complies with RFC 826 (Ethernet ARP). It supports
+ * Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6
+ * if an interface calls etharp_gratuitous(our_netif) upon address change.
+ */
+
+/*
+ * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
+ * Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
+ * Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_ARP || LWIP_ETHERNET
+
+#include "lwip/ip_addr.h"
+#include "lwip/def.h"
+#include "lwip/ip.h"
+#include "lwip/stats.h"
+#include "lwip/snmp.h"
+#include "lwip/dhcp.h"
+#include "lwip/autoip.h"
+#include "netif/etharp.h"
+
+#if PPPOE_SUPPORT
+#include "netif/ppp_oe.h"
+#endif /* PPPOE_SUPPORT */
+
+#include <string.h>
+
+const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
+const struct eth_addr ethzero = {{0,0,0,0,0,0}};
+
+#if LWIP_ARP /* don't build if not configured for use in lwipopts.h */
+
+/** the time an ARP entry stays valid after its last update,
+ * for ARP_TMR_INTERVAL = 5000, this is
+ * (240 * 5) seconds = 20 minutes.
+ */
+#define ARP_MAXAGE 240
+/** the time an ARP entry stays pending after first request,
+ * for ARP_TMR_INTERVAL = 5000, this is
+ * (2 * 5) seconds = 10 seconds.
+ *
+ * @internal Keep this number at least 2, otherwise it might
+ * run out instantly if the timeout occurs directly after a request.
+ */
+#define ARP_MAXPENDING 2
+
+#define HWTYPE_ETHERNET 1
+
+enum etharp_state {
+ ETHARP_STATE_EMPTY = 0,
+ ETHARP_STATE_PENDING,
+ ETHARP_STATE_STABLE
+};
+
+struct etharp_entry {
+#if ARP_QUEUEING
+ /** Pointer to queue of pending outgoing packets on this ARP entry. */
+ struct etharp_q_entry *q;
+#else /* ARP_QUEUEING */
+ /** Pointer to a single pending outgoing packet on this ARP entry. */
+ struct pbuf *q;
+#endif /* ARP_QUEUEING */
+ ip_addr_t ipaddr;
+ struct eth_addr ethaddr;
+#if LWIP_SNMP
+ struct netif *netif;
+#endif /* LWIP_SNMP */
+ u8_t state;
+ u8_t ctime;
+#if ETHARP_SUPPORT_STATIC_ENTRIES
+ u8_t static_entry;
+#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
+};
+
+static struct etharp_entry arp_table[ARP_TABLE_SIZE];
+
+#if !LWIP_NETIF_HWADDRHINT
+static u8_t etharp_cached_entry;
+#endif /* !LWIP_NETIF_HWADDRHINT */
+
+/** Try hard to create a new entry - we want the IP address to appear in
+ the cache (even if this means removing an active entry or so). */
+#define ETHARP_FLAG_TRY_HARD 1
+#define ETHARP_FLAG_FIND_ONLY 2
+#define ETHARP_FLAG_STATIC_ENTRY 4
+
+#if LWIP_NETIF_HWADDRHINT
+#define ETHARP_SET_HINT(netif, hint) if (((netif) != NULL) && ((netif)->addr_hint != NULL)) \
+ *((netif)->addr_hint) = (hint);
+#else /* LWIP_NETIF_HWADDRHINT */
+#define ETHARP_SET_HINT(netif, hint) (etharp_cached_entry = (hint))
+#endif /* LWIP_NETIF_HWADDRHINT */
+
+static err_t update_arp_entry(struct netif *netif, ip_addr_t *ipaddr, struct eth_addr *ethaddr, u8_t flags);
+
+
+/* Some checks, instead of etharp_init(): */
+#if (LWIP_ARP && (ARP_TABLE_SIZE > 0x7f))
+ #error "ARP_TABLE_SIZE must fit in an s8_t, you have to reduce it in your lwipopts.h"
+#endif
+
+
+#if ARP_QUEUEING
+/**
+ * Free a complete queue of etharp entries
+ *
+ * @param q a qeueue of etharp_q_entry's to free
+ */
+static void
+free_etharp_q(struct etharp_q_entry *q)
+{
+ struct etharp_q_entry *r;
+ LWIP_ASSERT("q != NULL", q != NULL);
+ LWIP_ASSERT("q->p != NULL", q->p != NULL);
+ while (q) {
+ r = q;
+ q = q->next;
+ LWIP_ASSERT("r->p != NULL", (r->p != NULL));
+ pbuf_free(r->p);
+ memp_free(MEMP_ARP_QUEUE, r);
+ }
+}
+#else /* ARP_QUEUEING */
+
+/** Compatibility define: free the queued pbuf */
+#define free_etharp_q(q) pbuf_free(q)
+
+#endif /* ARP_QUEUEING */
+
+/** Clean up ARP table entries */
+static void
+free_entry(int i)
+{
+ /* remove from SNMP ARP index tree */
+ snmp_delete_arpidx_tree(arp_table[i].netif, &arp_table[i].ipaddr);
+ /* and empty packet queue */
+ if (arp_table[i].q != NULL) {
+ /* remove all queued packets */
+ LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: freeing entry %"U16_F", packet queue %p.\n", (u16_t)i, (void *)(arp_table[i].q)));
+ free_etharp_q(arp_table[i].q);
+ arp_table[i].q = NULL;
+ }
+ /* recycle entry for re-use */
+ arp_table[i].state = ETHARP_STATE_EMPTY;
+#if ETHARP_SUPPORT_STATIC_ENTRIES
+ arp_table[i].static_entry = 0;
+#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
+#ifdef LWIP_DEBUG
+ /* for debugging, clean out the complete entry */
+ arp_table[i].ctime = 0;
+#if LWIP_SNMP
+ arp_table[i].netif = NULL;
+#endif /* LWIP_SNMP */
+ ip_addr_set_zero(&arp_table[i].ipaddr);
+ arp_table[i].ethaddr = ethzero;
+#endif /* LWIP_DEBUG */
+}
+
+/**
+ * Clears expired entries in the ARP table.
+ *
+ * This function should be called every ETHARP_TMR_INTERVAL milliseconds (5 seconds),
+ * in order to expire entries in the ARP table.
+ */
+void
+etharp_tmr(void)
+{
+ u8_t i;
+
+ LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n"));
+ /* remove expired entries from the ARP table */
+ for (i = 0; i < ARP_TABLE_SIZE; ++i) {
+ u8_t state = arp_table[i].state;
+ if (state != ETHARP_STATE_EMPTY
+#if ETHARP_SUPPORT_STATIC_ENTRIES
+ && (arp_table[i].static_entry == 0)
+#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
+ ) {
+ arp_table[i].ctime++;
+ if ((arp_table[i].ctime >= ARP_MAXAGE) ||
+ ((arp_table[i].state == ETHARP_STATE_PENDING) &&
+ (arp_table[i].ctime >= ARP_MAXPENDING))) {
+ /* pending or stable entry has become old! */
+ LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired %s entry %"U16_F".\n",
+ arp_table[i].state == ETHARP_STATE_STABLE ? "stable" : "pending", (u16_t)i));
+ /* clean up entries that have just been expired */
+ free_entry(i);
+ }
+#if ARP_QUEUEING
+ /* still pending entry? (not expired) */
+ if (arp_table[i].state == ETHARP_STATE_PENDING) {
+ /* resend an ARP query here? */
+ }
+#endif /* ARP_QUEUEING */
+ }
+ }
+}
+
+/**
+ * Search the ARP table for a matching or new entry.
+ *
+ * If an IP address is given, return a pending or stable ARP entry that matches
+ * the address. If no match is found, create a new entry with this address set,
+ * but in state ETHARP_EMPTY. The caller must check and possibly change the
+ * state of the returned entry.
+ *
+ * If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY.
+ *
+ * In all cases, attempt to create new entries from an empty entry. If no
+ * empty entries are available and ETHARP_FLAG_TRY_HARD flag is set, recycle
+ * old entries. Heuristic choose the least important entry for recycling.
+ *
+ * @param ipaddr IP address to find in ARP cache, or to add if not found.
+ * @param flags @see definition of ETHARP_FLAG_*
+ * @param netif netif related to this address (used for NETIF_HWADDRHINT)
+ *
+ * @return The ARP entry index that matched or is created, ERR_MEM if no
+ * entry is found or could be recycled.
+ */
+static s8_t
+find_entry(ip_addr_t *ipaddr, u8_t flags)
+{
+ s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE;
+ s8_t empty = ARP_TABLE_SIZE;
+ u8_t i = 0, age_pending = 0, age_stable = 0;
+ /* oldest entry with packets on queue */
+ s8_t old_queue = ARP_TABLE_SIZE;
+ /* its age */
+ u8_t age_queue = 0;
+
+ /**
+ * a) do a search through the cache, remember candidates
+ * b) select candidate entry
+ * c) create new entry
+ */
+
+ /* a) in a single search sweep, do all of this
+ * 1) remember the first empty entry (if any)
+ * 2) remember the oldest stable entry (if any)
+ * 3) remember the oldest pending entry without queued packets (if any)
+ * 4) remember the oldest pending entry with queued packets (if any)
+ * 5) search for a matching IP entry, either pending or stable
+ * until 5 matches, or all entries are searched for.
+ */
+
+ for (i = 0; i < ARP_TABLE_SIZE; ++i) {
+ u8_t state = arp_table[i].state;
+ /* no empty entry found yet and now we do find one? */
+ if ((empty == ARP_TABLE_SIZE) && (state == ETHARP_STATE_EMPTY)) {
+ LWIP_DEBUGF(ETHARP_DEBUG, ("find_entry: found empty entry %"U16_F"\n", (u16_t)i));
+ /* remember first empty entry */
+ empty = i;
+ } else if (state != ETHARP_STATE_EMPTY) {
+ LWIP_ASSERT("state == ETHARP_STATE_PENDING || state == ETHARP_STATE_STABLE",
+ state == ETHARP_STATE_PENDING || state == ETHARP_STATE_STABLE);
+ /* if given, does IP address match IP address in ARP entry? */
+ if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) {
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: found matching entry %"U16_F"\n", (u16_t)i));
+ /* found exact IP address match, simply bail out */
+ return i;
+ }
+ /* pending entry? */
+ if (state == ETHARP_STATE_PENDING) {
+ /* pending with queued packets? */
+ if (arp_table[i].q != NULL) {
+ if (arp_table[i].ctime >= age_queue) {
+ old_queue = i;
+ age_queue = arp_table[i].ctime;
+ }
+ } else
+ /* pending without queued packets? */
+ {
+ if (arp_table[i].ctime >= age_pending) {
+ old_pending = i;
+ age_pending = arp_table[i].ctime;
+ }
+ }
+ /* stable entry? */
+ } else if (state == ETHARP_STATE_STABLE) {
+#if ETHARP_SUPPORT_STATIC_ENTRIES
+ /* don't record old_stable for static entries since they never expire */
+ if (arp_table[i].static_entry == 0)
+#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
+ {
+ /* remember entry with oldest stable entry in oldest, its age in maxtime */
+ if (arp_table[i].ctime >= age_stable) {
+ old_stable = i;
+ age_stable = arp_table[i].ctime;
+ }
+ }
+ }
+ }
+ }
+ /* { we have no match } => try to create a new entry */
+
+ /* don't create new entry, only search? */
+ if (((flags & ETHARP_FLAG_FIND_ONLY) != 0) ||
+ /* or no empty entry found and not allowed to recycle? */
+ ((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_FLAG_TRY_HARD) == 0))) {
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: no empty entry found and not allowed to recycle\n"));
+ return (s8_t)ERR_MEM;
+ }
+
+ /* b) choose the least destructive entry to recycle:
+ * 1) empty entry
+ * 2) oldest stable entry
+ * 3) oldest pending entry without queued packets
+ * 4) oldest pending entry with queued packets
+ *
+ * { ETHARP_FLAG_TRY_HARD is set at this point }
+ */
+
+ /* 1) empty entry available? */
+ if (empty < ARP_TABLE_SIZE) {
+ i = empty;
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting empty entry %"U16_F"\n", (u16_t)i));
+ } else {
+ /* 2) found recyclable stable entry? */
+ if (old_stable < ARP_TABLE_SIZE) {
+ /* recycle oldest stable*/
+ i = old_stable;
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i));
+ /* no queued packets should exist on stable entries */
+ LWIP_ASSERT("arp_table[i].q == NULL", arp_table[i].q == NULL);
+ /* 3) found recyclable pending entry without queued packets? */
+ } else if (old_pending < ARP_TABLE_SIZE) {
+ /* recycle oldest pending */
+ i = old_pending;
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F" (without queue)\n", (u16_t)i));
+ /* 4) found recyclable pending entry with queued packets? */
+ } else if (old_queue < ARP_TABLE_SIZE) {
+ /* recycle oldest pending (queued packets are free in free_entry) */
+ i = old_queue;
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F", freeing packet queue %p\n", (u16_t)i, (void *)(arp_table[i].q)));
+ /* no empty or recyclable entries found */
+ } else {
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("find_entry: no empty or recyclable entries found\n"));
+ return (s8_t)ERR_MEM;
+ }
+
+ /* { empty or recyclable entry found } */
+ LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
+ free_entry(i);
+ }
+
+ LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE);
+ LWIP_ASSERT("arp_table[i].state == ETHARP_STATE_EMPTY",
+ arp_table[i].state == ETHARP_STATE_EMPTY);
+
+ /* IP address given? */
+ if (ipaddr != NULL) {
+ /* set IP address */
+ ip_addr_copy(arp_table[i].ipaddr, *ipaddr);
+ }
+ arp_table[i].ctime = 0;
+#if ETHARP_SUPPORT_STATIC_ENTRIES
+ arp_table[i].static_entry = 0;
+#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
+ return (err_t)i;
+}
+
+/**
+ * Send an IP packet on the network using netif->linkoutput
+ * The ethernet header is filled in before sending.
+ *
+ * @params netif the lwIP network interface on which to send the packet
+ * @params p the packet to send, p->payload pointing to the (uninitialized) ethernet header
+ * @params src the source MAC address to be copied into the ethernet header
+ * @params dst the destination MAC address to be copied into the ethernet header
+ * @return ERR_OK if the packet was sent, any other err_t on failure
+ */
+static err_t
+etharp_send_ip(struct netif *netif, struct pbuf *p, struct eth_addr *src, struct eth_addr *dst)
+{
+ struct eth_hdr *ethhdr = (struct eth_hdr *)p->payload;
+
+ LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
+ (netif->hwaddr_len == ETHARP_HWADDR_LEN));
+ ETHADDR32_COPY(ðhdr->dest, dst);
+ ETHADDR16_COPY(ðhdr->src, src);
+ ethhdr->type = PP_HTONS(ETHTYPE_IP);
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_send_ip: sending packet %p\n", (void *)p));
+ /* send the packet */
+ return netif->linkoutput(netif, p);
+}
+
+/**
+ * Update (or insert) a IP/MAC address pair in the ARP cache.
+ *
+ * If a pending entry is resolved, any queued packets will be sent
+ * at this point.
+ *
+ * @param netif netif related to this entry (used for NETIF_ADDRHINT)
+ * @param ipaddr IP address of the inserted ARP entry.
+ * @param ethaddr Ethernet address of the inserted ARP entry.
+ * @param flags @see definition of ETHARP_FLAG_*
+ *
+ * @return
+ * - ERR_OK Succesfully updated ARP cache.
+ * - ERR_MEM If we could not add a new ARP entry when ETHARP_FLAG_TRY_HARD was set.
+ * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
+ *
+ * @see pbuf_free()
+ */
+static err_t
+update_arp_entry(struct netif *netif, ip_addr_t *ipaddr, struct eth_addr *ethaddr, u8_t flags)
+{
+ s8_t i;
+ LWIP_ASSERT("netif->hwaddr_len == ETHARP_HWADDR_LEN", netif->hwaddr_len == ETHARP_HWADDR_LEN);
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F" - %02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F"\n",
+ ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
+ ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
+ ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
+ /* non-unicast address? */
+ if (ip_addr_isany(ipaddr) ||
+ ip_addr_isbroadcast(ipaddr, netif) ||
+ ip_addr_ismulticast(ipaddr)) {
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: will not add non-unicast IP address to ARP cache\n"));
+ return ERR_ARG;
+ }
+ /* find or create ARP entry */
+ i = find_entry(ipaddr, flags);
+ /* bail out if no entry could be found */
+ if (i < 0) {
+ return (err_t)i;
+ }
+
+#if ETHARP_SUPPORT_STATIC_ENTRIES
+ if (flags & ETHARP_FLAG_STATIC_ENTRY) {
+ /* record static type */
+ arp_table[i].static_entry = 1;
+ }
+#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
+
+ /* mark it stable */
+ arp_table[i].state = ETHARP_STATE_STABLE;
+
+#if LWIP_SNMP
+ /* record network interface */
+ arp_table[i].netif = netif;
+#endif /* LWIP_SNMP */
+ /* insert in SNMP ARP index tree */
+ snmp_insert_arpidx_tree(netif, &arp_table[i].ipaddr);
+
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i));
+ /* update address */
+ ETHADDR32_COPY(&arp_table[i].ethaddr, ethaddr);
+ /* reset time stamp */
+ arp_table[i].ctime = 0;
+ /* this is where we will send out queued packets! */
+#if ARP_QUEUEING
+ while (arp_table[i].q != NULL) {
+ struct pbuf *p;
+ /* remember remainder of queue */
+ struct etharp_q_entry *q = arp_table[i].q;
+ /* pop first item off the queue */
+ arp_table[i].q = q->next;
+ /* get the packet pointer */
+ p = q->p;
+ /* now queue entry can be freed */
+ memp_free(MEMP_ARP_QUEUE, q);
+#else /* ARP_QUEUEING */
+ if (arp_table[i].q != NULL) {
+ struct pbuf *p = arp_table[i].q;
+ arp_table[i].q = NULL;
+#endif /* ARP_QUEUEING */
+ /* send the queued IP packet */
+ etharp_send_ip(netif, p, (struct eth_addr*)(netif->hwaddr), ethaddr);
+ /* free the queued IP packet */
+ pbuf_free(p);
+ }
+ return ERR_OK;
+}
+
+#if ETHARP_SUPPORT_STATIC_ENTRIES
+/** Add a new static entry to the ARP table. If an entry exists for the
+ * specified IP address, this entry is overwritten.
+ * If packets are queued for the specified IP address, they are sent out.
+ *
+ * @param ipaddr IP address for the new static entry
+ * @param ethaddr ethernet address for the new static entry
+ * @return @see return values of etharp_add_static_entry
+ */
+err_t
+etharp_add_static_entry(ip_addr_t *ipaddr, struct eth_addr *ethaddr)
+{
+ struct netif *netif;
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_add_static_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F" - %02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F"\n",
+ ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr),
+ ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2],
+ ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5]));
+
+ netif = ip_route(ipaddr);
+ if (netif == NULL) {
+ return ERR_RTE;
+ }
+
+ return update_arp_entry(netif, ipaddr, ethaddr, ETHARP_FLAG_TRY_HARD | ETHARP_FLAG_STATIC_ENTRY);
+}
+
+/** Remove a static entry from the ARP table previously added with a call to
+ * etharp_add_static_entry.
+ *
+ * @param ipaddr IP address of the static entry to remove
+ * @return ERR_OK: entry removed
+ * ERR_MEM: entry wasn't found
+ * ERR_ARG: entry wasn't a static entry but a dynamic one
+ */
+err_t
+etharp_remove_static_entry(ip_addr_t *ipaddr)
+{
+ s8_t i;
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_remove_static_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr), ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
+
+ /* find or create ARP entry */
+ i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
+ /* bail out if no entry could be found */
+ if (i < 0) {
+ return (err_t)i;
+ }
+
+ if ((arp_table[i].state != ETHARP_STATE_STABLE) ||
+ (arp_table[i].static_entry == 0)) {
+ /* entry wasn't a static entry, cannot remove it */
+ return ERR_ARG;
+ }
+ /* entry found, free it */
+ free_entry(i);
+ return ERR_OK;
+}
+#endif /* ETHARP_SUPPORT_STATIC_ENTRIES */
+
+/**
+ * Finds (stable) ethernet/IP address pair from ARP table
+ * using interface and IP address index.
+ * @note the addresses in the ARP table are in network order!
+ *
+ * @param netif points to interface index
+ * @param ipaddr points to the (network order) IP address index
+ * @param eth_ret points to return pointer
+ * @param ip_ret points to return pointer
+ * @return table index if found, -1 otherwise
+ */
+s8_t
+etharp_find_addr(struct netif *netif, ip_addr_t *ipaddr,
+ struct eth_addr **eth_ret, ip_addr_t **ip_ret)
+{
+ s8_t i;
+
+ LWIP_ASSERT("eth_ret != NULL && ip_ret != NULL",
+ eth_ret != NULL && ip_ret != NULL);
+
+ LWIP_UNUSED_ARG(netif);
+
+ i = find_entry(ipaddr, ETHARP_FLAG_FIND_ONLY);
+ if((i >= 0) && arp_table[i].state == ETHARP_STATE_STABLE) {
+ *eth_ret = &arp_table[i].ethaddr;
+ *ip_ret = &arp_table[i].ipaddr;
+ return i;
+ }
+ return -1;
+}
+
+#if ETHARP_TRUST_IP_MAC
+/**
+ * Updates the ARP table using the given IP packet.
+ *
+ * Uses the incoming IP packet's source address to update the
+ * ARP cache for the local network. The function does not alter
+ * or free the packet. This function must be called before the
+ * packet p is passed to the IP layer.
+ *
+ * @param netif The lwIP network interface on which the IP packet pbuf arrived.
+ * @param p The IP packet that arrived on netif.
+ *
+ * @return NULL
+ *
+ * @see pbuf_free()
+ */
+static void
+etharp_ip_input(struct netif *netif, struct pbuf *p)
+{
+ struct eth_hdr *ethhdr;
+ struct ip_hdr *iphdr;
+ ip_addr_t iphdr_src;
+ LWIP_ERROR("netif != NULL", (netif != NULL), return;);
+
+ /* Only insert an entry if the source IP address of the
+ incoming IP packet comes from a host on the local network. */
+ ethhdr = (struct eth_hdr *)p->payload;
+ iphdr = (struct ip_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
+#if ETHARP_SUPPORT_VLAN
+ if (ethhdr->type == PP_HTONS(ETHTYPE_VLAN)) {
+ iphdr = (struct ip_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
+ }
+#endif /* ETHARP_SUPPORT_VLAN */
+
+ ip_addr_copy(iphdr_src, iphdr->src);
+
+ /* source is not on the local network? */
+ if (!ip_addr_netcmp(&iphdr_src, &(netif->ip_addr), &(netif->netmask))) {
+ /* do nothing */
+ return;
+ }
+
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n"));
+ /* update the source IP address in the cache, if present */
+ /* @todo We could use ETHARP_FLAG_TRY_HARD if we think we are going to talk
+ * back soon (for example, if the destination IP address is ours. */
+ update_arp_entry(netif, &iphdr_src, &(ethhdr->src), ETHARP_FLAG_FIND_ONLY);
+}
+#endif /* ETHARP_TRUST_IP_MAC */
+
+/**
+ * Responds to ARP requests to us. Upon ARP replies to us, add entry to cache
+ * send out queued IP packets. Updates cache with snooped address pairs.
+ *
+ * Should be called for incoming ARP packets. The pbuf in the argument
+ * is freed by this function.
+ *
+ * @param netif The lwIP network interface on which the ARP packet pbuf arrived.
+ * @param ethaddr Ethernet address of netif.
+ * @param p The ARP packet that arrived on netif. Is freed by this function.
+ *
+ * @return NULL
+ *
+ * @see pbuf_free()
+ */
+static void
+etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p)
+{
+ struct etharp_hdr *hdr;
+ struct eth_hdr *ethhdr;
+ /* these are aligned properly, whereas the ARP header fields might not be */
+ ip_addr_t sipaddr, dipaddr;
+ u8_t for_us;
+#if LWIP_AUTOIP
+ const u8_t * ethdst_hwaddr;
+#endif /* LWIP_AUTOIP */
+
+ LWIP_ERROR("netif != NULL", (netif != NULL), return;);
+
+ /* drop short ARP packets: we have to check for p->len instead of p->tot_len here
+ since a struct etharp_hdr is pointed to p->payload, so it musn't be chained! */
+ if (p->len < SIZEOF_ETHARP_PACKET) {
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
+ ("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len,
+ (s16_t)SIZEOF_ETHARP_PACKET));
+ ETHARP_STATS_INC(etharp.lenerr);
+ ETHARP_STATS_INC(etharp.drop);
+ pbuf_free(p);
+ return;
+ }
+
+ ethhdr = (struct eth_hdr *)p->payload;
+ hdr = (struct etharp_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
+#if ETHARP_SUPPORT_VLAN
+ if (ethhdr->type == PP_HTONS(ETHTYPE_VLAN)) {
+ hdr = (struct etharp_hdr *)(((u8_t*)ethhdr) + SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR);
+ }
+#endif /* ETHARP_SUPPORT_VLAN */
+
+ /* RFC 826 "Packet Reception": */
+ if ((hdr->hwtype != PP_HTONS(HWTYPE_ETHERNET)) ||
+ (hdr->hwlen != ETHARP_HWADDR_LEN) ||
+ (hdr->protolen != sizeof(ip_addr_t)) ||
+ (hdr->proto != PP_HTONS(ETHTYPE_IP))) {
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
+ ("etharp_arp_input: packet dropped, wrong hw type, hwlen, proto, protolen or ethernet type (%"U16_F"/%"U16_F"/%"U16_F"/%"U16_F")\n",
+ hdr->hwtype, hdr->hwlen, hdr->proto, hdr->protolen));
+ ETHARP_STATS_INC(etharp.proterr);
+ ETHARP_STATS_INC(etharp.drop);
+ pbuf_free(p);
+ return;
+ }
+ ETHARP_STATS_INC(etharp.recv);
+
+#if LWIP_AUTOIP
+ /* We have to check if a host already has configured our random
+ * created link local address and continously check if there is
+ * a host with this IP-address so we can detect collisions */
+ autoip_arp_reply(netif, hdr);
+#endif /* LWIP_AUTOIP */
+
+ /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
+ * structure packing (not using structure copy which breaks strict-aliasing rules). */
+ IPADDR2_COPY(&sipaddr, &hdr->sipaddr);
+ IPADDR2_COPY(&dipaddr, &hdr->dipaddr);
+
+ /* this interface is not configured? */
+ if (ip_addr_isany(&netif->ip_addr)) {
+ for_us = 0;
+ } else {
+ /* ARP packet directed to us? */
+ for_us = (u8_t)ip_addr_cmp(&dipaddr, &(netif->ip_addr));
+ }
+
+ /* ARP message directed to us?
+ -> add IP address in ARP cache; assume requester wants to talk to us,
+ can result in directly sending the queued packets for this host.
+ ARP message not directed to us?
+ -> update the source IP address in the cache, if present */
+ update_arp_entry(netif, &sipaddr, &(hdr->shwaddr),
+ for_us ? ETHARP_FLAG_TRY_HARD : ETHARP_FLAG_FIND_ONLY);
+
+ /* now act on the message itself */
+ switch (hdr->opcode) {
+ /* ARP request? */
+ case PP_HTONS(ARP_REQUEST):
+ /* ARP request. If it asked for our address, we send out a
+ * reply. In any case, we time-stamp any existing ARP entry,
+ * and possiby send out an IP packet that was queued on it. */
+
+ LWIP_DEBUGF (ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP request\n"));
+ /* ARP request for our address? */
+ if (for_us) {
+
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: replying to ARP request for our IP address\n"));
+ /* Re-use pbuf to send ARP reply.
+ Since we are re-using an existing pbuf, we can't call etharp_raw since
+ that would allocate a new pbuf. */
+ hdr->opcode = htons(ARP_REPLY);
+
+ IPADDR2_COPY(&hdr->dipaddr, &hdr->sipaddr);
+ IPADDR2_COPY(&hdr->sipaddr, &netif->ip_addr);
+
+ LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
+ (netif->hwaddr_len == ETHARP_HWADDR_LEN));
+#if LWIP_AUTOIP
+ /* If we are using Link-Local, all ARP packets that contain a Link-Local
+ * 'sender IP address' MUST be sent using link-layer broadcast instead of
+ * link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
+ ethdst_hwaddr = ip_addr_islinklocal(&netif->ip_addr) ? (u8_t*)(ethbroadcast.addr) : hdr->shwaddr.addr;
+#endif /* LWIP_AUTOIP */
+
+ ETHADDR16_COPY(&hdr->dhwaddr, &hdr->shwaddr);
+#if LWIP_AUTOIP
+ ETHADDR16_COPY(ðhdr->dest, ethdst_hwaddr);
+#else /* LWIP_AUTOIP */
+ ETHADDR16_COPY(ðhdr->dest, &hdr->shwaddr);
+#endif /* LWIP_AUTOIP */
+ ETHADDR16_COPY(&hdr->shwaddr, ethaddr);
+ ETHADDR16_COPY(ðhdr->src, ethaddr);
+
+ /* hwtype, hwaddr_len, proto, protolen and the type in the ethernet header
+ are already correct, we tested that before */
+
+ /* return ARP reply */
+ netif->linkoutput(netif, p);
+ /* we are not configured? */
+ } else if (ip_addr_isany(&netif->ip_addr)) {
+ /* { for_us == 0 and netif->ip_addr.addr == 0 } */
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: we are unconfigured, ARP request ignored.\n"));
+ /* request was not directed to us */
+ } else {
+ /* { for_us == 0 and netif->ip_addr.addr != 0 } */
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP request was not for us.\n"));
+ }
+ break;
+ case PP_HTONS(ARP_REPLY):
+ /* ARP reply. We already updated the ARP cache earlier. */
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n"));
+#if (LWIP_DHCP && DHCP_DOES_ARP_CHECK)
+ /* DHCP wants to know about ARP replies from any host with an
+ * IP address also offered to us by the DHCP server. We do not
+ * want to take a duplicate IP address on a single network.
+ * @todo How should we handle redundant (fail-over) interfaces? */
+ dhcp_arp_reply(netif, &sipaddr);
+#endif /* (LWIP_DHCP && DHCP_DOES_ARP_CHECK) */
+ break;
+ default:
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode)));
+ ETHARP_STATS_INC(etharp.err);
+ break;
+ }
+ /* free ARP packet */
+ pbuf_free(p);
+}
+
+/**
+ * Resolve and fill-in Ethernet address header for outgoing IP packet.
+ *
+ * For IP multicast and broadcast, corresponding Ethernet addresses
+ * are selected and the packet is transmitted on the link.
+ *
+ * For unicast addresses, the packet is submitted to etharp_query(). In
+ * case the IP address is outside the local network, the IP address of
+ * the gateway is used.
+ *
+ * @param netif The lwIP network interface which the IP packet will be sent on.
+ * @param q The pbuf(s) containing the IP packet to be sent.
+ * @param ipaddr The IP address of the packet destination.
+ *
+ * @return
+ * - ERR_RTE No route to destination (no gateway to external networks),
+ * or the return type of either etharp_query() or etharp_send_ip().
+ */
+err_t
+etharp_output(struct netif *netif, struct pbuf *q, ip_addr_t *ipaddr)
+{
+ struct eth_addr *dest, mcastaddr;
+
+ /* make room for Ethernet header - should not fail */
+ if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) {
+ /* bail out */
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
+ ("etharp_output: could not allocate room for header.\n"));
+ LINK_STATS_INC(link.lenerr);
+ return ERR_BUF;
+ }
+
+ /* assume unresolved Ethernet address */
+ dest = NULL;
+ /* Determine on destination hardware address. Broadcasts and multicasts
+ * are special, other IP addresses are looked up in the ARP table. */
+
+ /* broadcast destination IP address? */
+ if (ip_addr_isbroadcast(ipaddr, netif)) {
+ /* broadcast on Ethernet also */
+ dest = (struct eth_addr *)ðbroadcast;
+ /* multicast destination IP address? */
+ } else if (ip_addr_ismulticast(ipaddr)) {
+ /* Hash IP multicast address to MAC address.*/
+ mcastaddr.addr[0] = 0x01;
+ mcastaddr.addr[1] = 0x00;
+ mcastaddr.addr[2] = 0x5e;
+ mcastaddr.addr[3] = ip4_addr2(ipaddr) & 0x7f;
+ mcastaddr.addr[4] = ip4_addr3(ipaddr);
+ mcastaddr.addr[5] = ip4_addr4(ipaddr);
+ /* destination Ethernet address is multicast */
+ dest = &mcastaddr;
+ /* unicast destination IP address? */
+ } else {
+ /* outside local network? */
+ if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask)) &&
+ !ip_addr_islinklocal(ipaddr)) {
+#if LWIP_AUTOIP
+ struct ip_hdr *iphdr = (struct ip_hdr*)((u8_t*)q->payload +
+ sizeof(struct eth_hdr));
+ /* According to RFC 3297, chapter 2.6.2 (Forwarding Rules), a packet with
+ a link-local source address must always be "directly to its destination
+ on the same physical link. The host MUST NOT send the packet to any
+ router for forwarding". */
+ if (!ip_addr_islinklocal(&iphdr->src))
+#endif /* LWIP_AUTOIP */
+ {
+ /* interface has default gateway? */
+ if (!ip_addr_isany(&netif->gw)) {
+ /* send to hardware address of default gateway IP address */
+ ipaddr = &(netif->gw);
+ /* no default gateway available */
+ } else {
+ /* no route to destination error (default gateway missing) */
+ return ERR_RTE;
+ }
+ }
+ }
+#if LWIP_NETIF_HWADDRHINT
+ if (netif->addr_hint != NULL) {
+ /* per-pcb cached entry was given */
+ u8_t etharp_cached_entry = *(netif->addr_hint);
+ if (etharp_cached_entry < ARP_TABLE_SIZE) {
+#endif /* LWIP_NETIF_HWADDRHINT */
+ if ((arp_table[etharp_cached_entry].state == ETHARP_STATE_STABLE) &&
+ (ip_addr_cmp(ipaddr, &arp_table[etharp_cached_entry].ipaddr))) {
+ /* the per-pcb-cached entry is stable and the right one! */
+ ETHARP_STATS_INC(etharp.cachehit);
+ return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr),
+ &arp_table[etharp_cached_entry].ethaddr);
+ }
+#if LWIP_NETIF_HWADDRHINT
+ }
+ }
+#endif /* LWIP_NETIF_HWADDRHINT */
+ /* queue on destination Ethernet address belonging to ipaddr */
+ return etharp_query(netif, ipaddr, q);
+ }
+
+ /* continuation for multicast/broadcast destinations */
+ /* obtain source Ethernet address of the given interface */
+ /* send packet directly on the link */
+ return etharp_send_ip(netif, q, (struct eth_addr*)(netif->hwaddr), dest);
+}
+
+/**
+ * Send an ARP request for the given IP address and/or queue a packet.
+ *
+ * If the IP address was not yet in the cache, a pending ARP cache entry
+ * is added and an ARP request is sent for the given address. The packet
+ * is queued on this entry.
+ *
+ * If the IP address was already pending in the cache, a new ARP request
+ * is sent for the given address. The packet is queued on this entry.
+ *
+ * If the IP address was already stable in the cache, and a packet is
+ * given, it is directly sent and no ARP request is sent out.
+ *
+ * If the IP address was already stable in the cache, and no packet is
+ * given, an ARP request is sent out.
+ *
+ * @param netif The lwIP network interface on which ipaddr
+ * must be queried for.
+ * @param ipaddr The IP address to be resolved.
+ * @param q If non-NULL, a pbuf that must be delivered to the IP address.
+ * q is not freed by this function.
+ *
+ * @note q must only be ONE packet, not a packet queue!
+ *
+ * @return
+ * - ERR_BUF Could not make room for Ethernet header.
+ * - ERR_MEM Hardware address unknown, and no more ARP entries available
+ * to query for address or queue the packet.
+ * - ERR_MEM Could not queue packet due to memory shortage.
+ * - ERR_RTE No route to destination (no gateway to external networks).
+ * - ERR_ARG Non-unicast address given, those will not appear in ARP cache.
+ *
+ */
+err_t
+etharp_query(struct netif *netif, ip_addr_t *ipaddr, struct pbuf *q)
+{
+ struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr;
+ err_t result = ERR_MEM;
+ s8_t i; /* ARP entry index */
+
+ /* non-unicast address? */
+ if (ip_addr_isbroadcast(ipaddr, netif) ||
+ ip_addr_ismulticast(ipaddr) ||
+ ip_addr_isany(ipaddr)) {
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: will not add non-unicast IP address to ARP cache\n"));
+ return ERR_ARG;
+ }
+
+ /* find entry in ARP cache, ask to create entry if queueing packet */
+ i = find_entry(ipaddr, ETHARP_FLAG_TRY_HARD);
+
+ /* could not find or create entry? */
+ if (i < 0) {
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not create ARP entry\n"));
+ if (q) {
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: packet dropped\n"));
+ ETHARP_STATS_INC(etharp.memerr);
+ }
+ return (err_t)i;
+ }
+
+ /* mark a fresh entry as pending (we just sent a request) */
+ if (arp_table[i].state == ETHARP_STATE_EMPTY) {
+ arp_table[i].state = ETHARP_STATE_PENDING;
+ }
+
+ /* { i is either a STABLE or (new or existing) PENDING entry } */
+ LWIP_ASSERT("arp_table[i].state == PENDING or STABLE",
+ ((arp_table[i].state == ETHARP_STATE_PENDING) ||
+ (arp_table[i].state == ETHARP_STATE_STABLE)));
+
+ /* do we have a pending entry? or an implicit query request? */
+ if ((arp_table[i].state == ETHARP_STATE_PENDING) || (q == NULL)) {
+ /* try to resolve it; send out ARP request */
+ result = etharp_request(netif, ipaddr);
+ if (result != ERR_OK) {
+ /* ARP request couldn't be sent */
+ /* We don't re-send arp request in etharp_tmr, but we still queue packets,
+ since this failure could be temporary, and the next packet calling
+ etharp_query again could lead to sending the queued packets. */
+ }
+ if (q == NULL) {
+ return result;
+ }
+ }
+
+ /* packet given? */
+ LWIP_ASSERT("q != NULL", q != NULL);
+ /* stable entry? */
+ if (arp_table[i].state == ETHARP_STATE_STABLE) {
+ /* we have a valid IP->Ethernet address mapping */
+ ETHARP_SET_HINT(netif, i);
+ /* send the packet */
+ result = etharp_send_ip(netif, q, srcaddr, &(arp_table[i].ethaddr));
+ /* pending entry? (either just created or already pending */
+ } else if (arp_table[i].state == ETHARP_STATE_PENDING) {
+ /* entry is still pending, queue the given packet 'q' */
+ struct pbuf *p;
+ int copy_needed = 0;
+ /* IF q includes a PBUF_REF, PBUF_POOL or PBUF_RAM, we have no choice but
+ * to copy the whole queue into a new PBUF_RAM (see bug #11400)
+ * PBUF_ROMs can be left as they are, since ROM must not get changed. */
+ p = q;
+ while (p) {
+ LWIP_ASSERT("no packet queues allowed!", (p->len != p->tot_len) || (p->next == 0));
+ if(p->type != PBUF_ROM) {
+ copy_needed = 1;
+ break;
+ }
+ p = p->next;
+ }
+ if(copy_needed) {
+ /* copy the whole packet into new pbufs */
+ p = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
+ if(p != NULL) {
+ if (pbuf_copy(p, q) != ERR_OK) {
+ pbuf_free(p);
+ p = NULL;
+ }
+ }
+ } else {
+ /* referencing the old pbuf is enough */
+ p = q;
+ pbuf_ref(p);
+ }
+ /* packet could be taken over? */
+ if (p != NULL) {
+ /* queue packet ... */
+#if ARP_QUEUEING
+ struct etharp_q_entry *new_entry;
+ /* allocate a new arp queue entry */
+ new_entry = (struct etharp_q_entry *)memp_malloc(MEMP_ARP_QUEUE);
+ if (new_entry != NULL) {
+ new_entry->next = 0;
+ new_entry->p = p;
+ if(arp_table[i].q != NULL) {
+ /* queue was already existent, append the new entry to the end */
+ struct etharp_q_entry *r;
+ r = arp_table[i].q;
+ while (r->next != NULL) {
+ r = r->next;
+ }
+ r->next = new_entry;
+ } else {
+ /* queue did not exist, first item in queue */
+ arp_table[i].q = new_entry;
+ }
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
+ result = ERR_OK;
+ } else {
+ /* the pool MEMP_ARP_QUEUE is empty */
+ pbuf_free(p);
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not queue a copy of PBUF_REF packet %p (out of memory)\n", (void *)q));
+ result = ERR_MEM;
+ }
+#else /* ARP_QUEUEING */
+ /* always queue one packet per ARP request only, freeing a previously queued packet */
+ if (arp_table[i].q != NULL) {
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: dropped previously queued packet %p for ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
+ pbuf_free(arp_table[i].q);
+ }
+ arp_table[i].q = p;
+ result = ERR_OK;
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i));
+#endif /* ARP_QUEUEING */
+ } else {
+ ETHARP_STATS_INC(etharp.memerr);
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_query: could not queue a copy of PBUF_REF packet %p (out of memory)\n", (void *)q));
+ result = ERR_MEM;
+ }
+ }
+ return result;
+}
+
+/**
+ * Send a raw ARP packet (opcode and all addresses can be modified)
+ *
+ * @param netif the lwip network interface on which to send the ARP packet
+ * @param ethsrc_addr the source MAC address for the ethernet header
+ * @param ethdst_addr the destination MAC address for the ethernet header
+ * @param hwsrc_addr the source MAC address for the ARP protocol header
+ * @param ipsrc_addr the source IP address for the ARP protocol header
+ * @param hwdst_addr the destination MAC address for the ARP protocol header
+ * @param ipdst_addr the destination IP address for the ARP protocol header
+ * @param opcode the type of the ARP packet
+ * @return ERR_OK if the ARP packet has been sent
+ * ERR_MEM if the ARP packet couldn't be allocated
+ * any other err_t on failure
+ */
+#if !LWIP_AUTOIP
+static
+#endif /* LWIP_AUTOIP */
+err_t
+etharp_raw(struct netif *netif, const struct eth_addr *ethsrc_addr,
+ const struct eth_addr *ethdst_addr,
+ const struct eth_addr *hwsrc_addr, const ip_addr_t *ipsrc_addr,
+ const struct eth_addr *hwdst_addr, const ip_addr_t *ipdst_addr,
+ const u16_t opcode)
+{
+ struct pbuf *p;
+ err_t result = ERR_OK;
+ struct eth_hdr *ethhdr;
+ struct etharp_hdr *hdr;
+#if LWIP_AUTOIP
+ const u8_t * ethdst_hwaddr;
+#endif /* LWIP_AUTOIP */
+
+ /* allocate a pbuf for the outgoing ARP request packet */
+ p = pbuf_alloc(PBUF_RAW, SIZEOF_ETHARP_PACKET, PBUF_RAM);
+ /* could allocate a pbuf for an ARP request? */
+ if (p == NULL) {
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
+ ("etharp_raw: could not allocate pbuf for ARP request.\n"));
+ ETHARP_STATS_INC(etharp.memerr);
+ return ERR_MEM;
+ }
+ LWIP_ASSERT("check that first pbuf can hold struct etharp_hdr",
+ (p->len >= SIZEOF_ETHARP_PACKET));
+
+ ethhdr = (struct eth_hdr *)p->payload;
+ hdr = (struct etharp_hdr *)((u8_t*)ethhdr + SIZEOF_ETH_HDR);
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_raw: sending raw ARP packet.\n"));
+ hdr->opcode = htons(opcode);
+
+ LWIP_ASSERT("netif->hwaddr_len must be the same as ETHARP_HWADDR_LEN for etharp!",
+ (netif->hwaddr_len == ETHARP_HWADDR_LEN));
+#if LWIP_AUTOIP
+ /* If we are using Link-Local, all ARP packets that contain a Link-Local
+ * 'sender IP address' MUST be sent using link-layer broadcast instead of
+ * link-layer unicast. (See RFC3927 Section 2.5, last paragraph) */
+ ethdst_hwaddr = ip_addr_islinklocal(ipsrc_addr) ? (u8_t*)(ethbroadcast.addr) : ethdst_addr->addr;
+#endif /* LWIP_AUTOIP */
+ /* Write the ARP MAC-Addresses */
+ ETHADDR16_COPY(&hdr->shwaddr, hwsrc_addr);
+ ETHADDR16_COPY(&hdr->dhwaddr, hwdst_addr);
+ /* Write the Ethernet MAC-Addresses */
+#if LWIP_AUTOIP
+ ETHADDR16_COPY(ðhdr->dest, ethdst_hwaddr);
+#else /* LWIP_AUTOIP */
+ ETHADDR16_COPY(ðhdr->dest, ethdst_addr);
+#endif /* LWIP_AUTOIP */
+ ETHADDR16_COPY(ðhdr->src, ethsrc_addr);
+ /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
+ * structure packing. */
+ IPADDR2_COPY(&hdr->sipaddr, ipsrc_addr);
+ IPADDR2_COPY(&hdr->dipaddr, ipdst_addr);
+
+ hdr->hwtype = PP_HTONS(HWTYPE_ETHERNET);
+ hdr->proto = PP_HTONS(ETHTYPE_IP);
+ /* set hwlen and protolen */
+ hdr->hwlen = ETHARP_HWADDR_LEN;
+ hdr->protolen = sizeof(ip_addr_t);
+
+ ethhdr->type = PP_HTONS(ETHTYPE_ARP);
+ /* send ARP query */
+ result = netif->linkoutput(netif, p);
+ ETHARP_STATS_INC(etharp.xmit);
+ /* free ARP query packet */
+ pbuf_free(p);
+ p = NULL;
+ /* could not allocate pbuf for ARP request */
+
+ return result;
+}
+
+/**
+ * Send an ARP request packet asking for ipaddr.
+ *
+ * @param netif the lwip network interface on which to send the request
+ * @param ipaddr the IP address for which to ask
+ * @return ERR_OK if the request has been sent
+ * ERR_MEM if the ARP packet couldn't be allocated
+ * any other err_t on failure
+ */
+err_t
+etharp_request(struct netif *netif, ip_addr_t *ipaddr)
+{
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("etharp_request: sending ARP request.\n"));
+ return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, ðbroadcast,
+ (struct eth_addr *)netif->hwaddr, &netif->ip_addr, ðzero,
+ ipaddr, ARP_REQUEST);
+}
+#endif /* LWIP_ARP */
+
+/**
+ * Process received ethernet frames. Using this function instead of directly
+ * calling ip_input and passing ARP frames through etharp in ethernetif_input,
+ * the ARP cache is protected from concurrent access.
+ *
+ * @param p the recevied packet, p->payload pointing to the ethernet header
+ * @param netif the network interface on which the packet was received
+ */
+err_t
+ethernet_input(struct pbuf *p, struct netif *netif)
+{
+ struct eth_hdr* ethhdr;
+ u16_t type;
+ s16_t ip_hdr_offset = SIZEOF_ETH_HDR;
+
+ if (p->len <= SIZEOF_ETH_HDR) {
+ /* a packet with only an ethernet header (or less) is not valid for us */
+ ETHARP_STATS_INC(etharp.proterr);
+ ETHARP_STATS_INC(etharp.drop);
+ goto free_and_return;
+ }
+
+ /* points to packet payload, which starts with an Ethernet header */
+ ethhdr = (struct eth_hdr *)p->payload;
+ LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE,
+ ("ethernet_input: dest:%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F", src:%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F", type:%"X16_F"\n",
+ (unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2],
+ (unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5],
+ (unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2],
+ (unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5],
+ (unsigned)htons(ethhdr->type)));
+
+ type = ethhdr->type;
+#if ETHARP_SUPPORT_VLAN
+ if (type == PP_HTONS(ETHTYPE_VLAN)) {
+ struct eth_vlan_hdr *vlan = (struct eth_vlan_hdr*)(((char*)ethhdr) + SIZEOF_ETH_HDR);
+ if (p->len <= SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR) {
+ /* a packet with only an ethernet/vlan header (or less) is not valid for us */
+ ETHARP_STATS_INC(etharp.proterr);
+ ETHARP_STATS_INC(etharp.drop);
+ goto free_and_return;
+ }
+#ifdef ETHARP_VLAN_CHECK /* if not, allow all VLANs */
+ if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
+ /* silently ignore this packet: not for our VLAN */
+ pbuf_free(p);
+ return ERR_OK;
+ }
+#endif /* ETHARP_VLAN_CHECK */
+ type = vlan->tpid;
+ ip_hdr_offset = SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR;
+ }
+#endif /* ETHARP_SUPPORT_VLAN */
+
+#if LWIP_ARP_FILTER_NETIF
+ netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, htons(type));
+#endif /* LWIP_ARP_FILTER_NETIF*/
+
+ switch (type) {
+#if LWIP_ARP
+ /* IP packet? */
+ case PP_HTONS(ETHTYPE_IP):
+ if (!(netif->flags & NETIF_FLAG_ETHARP)) {
+ goto free_and_return;
+ }
+#if ETHARP_TRUST_IP_MAC
+ /* update ARP table */
+ etharp_ip_input(netif, p);
+#endif /* ETHARP_TRUST_IP_MAC */
+ /* skip Ethernet header */
+ if(pbuf_header(p, -ip_hdr_offset)) {
+ LWIP_ASSERT("Can't move over header in packet", 0);
+ goto free_and_return;
+ } else {
+ /* pass to IP layer */
+ ip_input(p, netif);
+ }
+ break;
+
+ case PP_HTONS(ETHTYPE_ARP):
+ if (!(netif->flags & NETIF_FLAG_ETHARP)) {
+ goto free_and_return;
+ }
+ /* pass p to ARP module */
+ etharp_arp_input(netif, (struct eth_addr*)(netif->hwaddr), p);
+ break;
+#endif /* LWIP_ARP */
+#if PPPOE_SUPPORT
+ case PP_HTONS(ETHTYPE_PPPOEDISC): /* PPP Over Ethernet Discovery Stage */
+ pppoe_disc_input(netif, p);
+ break;
+
+ case PP_HTONS(ETHTYPE_PPPOE): /* PPP Over Ethernet Session Stage */
+ pppoe_data_input(netif, p);
+ break;
+#endif /* PPPOE_SUPPORT */
+
+ default:
+ ETHARP_STATS_INC(etharp.proterr);
+ ETHARP_STATS_INC(etharp.drop);
+ goto free_and_return;
+ }
+
+ /* This means the pbuf is freed or consumed,
+ so the caller doesn't have to free it again */
+ return ERR_OK;
+
+free_and_return:
+ pbuf_free(p);
+ return ERR_OK;
+}
+#endif /* LWIP_ARP || LWIP_ETHERNET */
--- /dev/null
+/*\r
+ FreeRTOS V7.0.1 - Copyright (C) 2011 Real Time Engineers Ltd.\r
+ \r
+\r
+ ***************************************************************************\r
+ * *\r
+ * FreeRTOS tutorial books are available in pdf and paperback. *\r
+ * Complete, revised, and edited pdf reference manuals are also *\r
+ * available. *\r
+ * *\r
+ * Purchasing FreeRTOS documentation will not only help you, by *\r
+ * ensuring you get running as quickly as possible and with an *\r
+ * in-depth knowledge of how to use FreeRTOS, it will also help *\r
+ * the FreeRTOS project to continue with its mission of providing *\r
+ * professional grade, cross platform, de facto standard solutions *\r
+ * for microcontrollers - completely free of charge! *\r
+ * *\r
+ * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *\r
+ * *\r
+ * Thank you for using FreeRTOS, and thank you for your support! *\r
+ * *\r
+ ***************************************************************************\r
+\r
+\r
+ This file is part of the FreeRTOS distribution.\r
+\r
+ FreeRTOS is free software; you can redistribute it and/or modify it under\r
+ the terms of the GNU General Public License (version 2) as published by the\r
+ Free Software Foundation AND MODIFIED BY the FreeRTOS exception.\r
+ >>>NOTE<<< The modification to the GPL is included to allow you to\r
+ distribute a combined work that includes FreeRTOS without being obliged to\r
+ provide the source code for proprietary components outside of the FreeRTOS\r
+ kernel. FreeRTOS is distributed in the hope that it will be useful, but\r
+ WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY\r
+ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for\r
+ more details. You should have received a copy of the GNU General Public\r
+ License and the FreeRTOS license exception along with FreeRTOS; if not it\r
+ can be viewed here: http://www.freertos.org/a00114.html and also obtained\r
+ by writing to Richard Barry, contact details for whom are available on the\r
+ FreeRTOS WEB site.\r
+\r
+ 1 tab == 4 spaces!\r
+\r
+ http://www.FreeRTOS.org - Documentation, latest information, license and\r
+ contact details.\r
+\r
+ http://www.SafeRTOS.com - A version that is certified for use in safety\r
+ critical systems.\r
+\r
+ http://www.OpenRTOS.com - Commercial support, development, porting,\r
+ licensing and training services.\r
+*/\r
+\r
+/* WinPCap includes. */\r
+#define HAVE_REMOTE\r
+#include "pcap.h"\r
+\r
+/* FreeRTOS includes. */\r
+#include "FreeRTOS.h"\r
+#include "task.h"\r
+#include "queue.h"\r
+\r
+/* lwIP includes. */\r
+#include "lwip/opt.h"\r
+#include "lwip/def.h"\r
+#include "lwip/mem.h"\r
+#include "lwip/pbuf.h"\r
+#include "lwip/sys.h"\r
+#include <lwip/stats.h>\r
+#include <lwip/snmp.h>\r
+#include "netif/etharp.h"\r
+#include "netif/ppp_oe.h"\r
+\r
+/* Define those to better describe your network interface. */\r
+#define IFNAME0 'w'\r
+#define IFNAME1 'p'\r
+\r
+#define netifMAX_MTU 1500\r
+\r
+struct ethernetif \r
+{\r
+ struct eth_addr *ethaddr;\r
+ /* Add whatever per-interface state that is needed here. */\r
+};\r
+\r
+/* Forward declarations. */\r
+static void ethernetif_input( const unsigned char * const pucInputData, long lLength );\r
+static struct pbuf *low_level_input( const unsigned char * const pucInputData, long lDataLength );\r
+\r
+/*\r
+ * Query the computer the simulation is being executed on to find the network\r
+ * interfaces it has installed.\r
+ */\r
+static pcap_if_t * prvPrintAvailableNetworkInterfaces( void );\r
+\r
+/*\r
+ * Open the network interface. The number of the interface to be opened is set\r
+ * by the configNETWORK_INTERFACE_TO_USE constant in FreeRTOSConfig.h.\r
+ */\r
+static void prvOpenSelectedNetworkInterface( pcap_if_t *pxAllNetworkInterfaces );\r
+\r
+/*\r
+ * Interrupts cannot truely be simulated using WinPCap. In reality this task\r
+ * just polls the interface. \r
+ */\r
+static void prvInterruptSimulator( void *pvParameters );\r
+/*\r
+ * Configure the capture filter to allow blocking reads, and to filter out\r
+ * packets that are not of interest to this demo.\r
+ */\r
+static void prvConfigureCaptureBehaviour( void );\r
+\r
+/* The WinPCap interface being used. */\r
+static pcap_t *pxOpenedInterfaceHandle = NULL;\r
+\r
+/* Parameter required for WinPCap API functions. */\r
+static char cErrorBuffer[ PCAP_ERRBUF_SIZE ];\r
+\r
+/* The network interface that was opened. */\r
+static struct netif *xlwIPNetif = NULL;\r
+\r
+/**\r
+ * In this function, the hardware should be initialized.\r
+ * Called from ethernetif_init().\r
+ *\r
+ * @param netif the already initialized lwip network interface structure\r
+ * for this ethernetif\r
+ */\r
+static void low_level_init(struct netif *netif)\r
+{\r
+pcap_if_t *pxAllNetworkInterfaces;\r
+ \r
+ /* set MAC hardware address length */\r
+ netif->hwaddr_len = ETHARP_HWADDR_LEN;\r
+\r
+ /* set MAC hardware address */\r
+ netif->hwaddr[ 0 ] = configMAC_ADDR0;\r
+ netif->hwaddr[ 1 ] = configMAC_ADDR1;\r
+ netif->hwaddr[ 2 ] = configMAC_ADDR2;\r
+ netif->hwaddr[ 3 ] = configMAC_ADDR3;\r
+ netif->hwaddr[ 4 ] = configMAC_ADDR4;\r
+ netif->hwaddr[ 5 ] = configMAC_ADDR5;\r
+\r
+ /* device capabilities */\r
+ /* don't set NETIF_FLAG_ETHARP if this device is not an ethernet one */\r
+ netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_LINK_UP;\r
+ \r
+ /* Query the computer the simulation is being executed on to find the \r
+ network interfaces it has installed. */\r
+ pxAllNetworkInterfaces = prvPrintAvailableNetworkInterfaces();\r
+ \r
+ /* Open the network interface. The number of the interface to be opened is \r
+ set by the configNETWORK_INTERFACE_TO_USE constant in FreeRTOSConfig.h.\r
+ Calling this function will set the pxOpenedInterfaceHandle variable. If,\r
+ after calling this function, pxOpenedInterfaceHandle is equal to NULL, then\r
+ the interface could not be opened. */\r
+ if( pxAllNetworkInterfaces != NULL )\r
+ {\r
+ prvOpenSelectedNetworkInterface( pxAllNetworkInterfaces );\r
+ }\r
+\r
+ /* Remember which interface was opened as it is used in the interrupt \r
+ simulator task. */\r
+ xlwIPNetif = netif;\r
+}\r
+\r
+/**\r
+ * This function should do the actual transmission of the packet. The packet is\r
+ * contained in the pbuf that is passed to the function. This pbuf\r
+ * might be chained.\r
+ *\r
+ * @param netif the lwip network interface structure for this ethernetif\r
+ * @param p the MAC packet to send (e.g. IP packet including MAC addresses and type)\r
+ * @return ERR_OK if the packet could be sent\r
+ * an err_t value if the packet couldn't be sent\r
+ *\r
+ * @note Returning ERR_MEM here if a DMA queue of your MAC is full can lead to\r
+ * strange results. You might consider waiting for space in the DMA queue\r
+ * to become availale since the stack doesn't retry to send a packet\r
+ * dropped because of memory failure (except for the TCP timers).\r
+ */\r
+\r
+static err_t low_level_output(struct netif *netif, struct pbuf *p)\r
+{\r
+\r
+ /* This is taken from lwIP example code and therefore does not conform\r
+ to the FreeRTOS coding standard. */\r
+\r
+struct pbuf *q;\r
+static unsigned char buffer[ 1520 ];\r
+unsigned char *buf = buffer;\r
+unsigned char *ptr;\r
+struct eth_hdr *ethhdr;\r
+u16_t tot_len = p->tot_len - ETH_PAD_SIZE;\r
+\r
+ #if defined(LWIP_DEBUG) && LWIP_NETIF_TX_SINGLE_PBUF\r
+ LWIP_ASSERT("p->next == NULL && p->len == p->tot_len", p->next == NULL && p->len == p->tot_len);\r
+ #endif\r
+\r
+ /* initiate transfer */\r
+ if (p->len == p->tot_len) \r
+ {\r
+ /* no pbuf chain, don't have to copy -> faster */\r
+ buf = &((unsigned char*)p->payload)[ETH_PAD_SIZE];\r
+ } \r
+ else \r
+ {\r
+ /* pbuf chain, copy into contiguous buffer */\r
+ if (p->tot_len >= sizeof(buffer)) \r
+ {\r
+ LINK_STATS_INC(link.lenerr);\r
+ LINK_STATS_INC(link.drop);\r
+ snmp_inc_ifoutdiscards(netif);\r
+ return ERR_BUF;\r
+ }\r
+\r
+ ptr = buffer;\r
+\r
+ for( q = p; q != NULL; q = q->next ) \r
+ {\r
+ /* Send the data from the pbuf to the interface, one pbuf at a\r
+ time. The size of the data in each pbuf is kept in the ->len\r
+ variable. */\r
+ /* send data from(q->payload, q->len); */\r
+ LWIP_DEBUGF(NETIF_DEBUG, ("netif: send ptr %p q->payload %p q->len %i q->next %p\n", ptr, q->payload, (int)q->len, (void*)q->next));\r
+ if (q == p) \r
+ {\r
+ memcpy(ptr, &((char*)q->payload)[ETH_PAD_SIZE], q->len - ETH_PAD_SIZE);\r
+ ptr += q->len - ETH_PAD_SIZE;\r
+ } \r
+ else \r
+ {\r
+ memcpy(ptr, q->payload, q->len);\r
+ ptr += q->len;\r
+ }\r
+ }\r
+ }\r
+\r
+ /* signal that packet should be sent */\r
+ if( pcap_sendpacket( pxOpenedInterfaceHandle, buf, tot_len ) < 0 ) \r
+ {\r
+ LINK_STATS_INC(link.memerr);\r
+ LINK_STATS_INC(link.drop);\r
+ snmp_inc_ifoutdiscards(netif);\r
+ return ERR_BUF;\r
+ }\r
+\r
+ LINK_STATS_INC(link.xmit);\r
+ snmp_add_ifoutoctets(netif, tot_len);\r
+ ethhdr = (struct eth_hdr *)p->payload;\r
+\r
+ if( ( ethhdr->dest.addr[ 0 ] & 1 ) != 0 ) \r
+ {\r
+ /* broadcast or multicast packet*/\r
+ snmp_inc_ifoutnucastpkts(netif);\r
+ } \r
+ else \r
+ {\r
+ /* unicast packet */\r
+ snmp_inc_ifoutucastpkts( netif );\r
+ }\r
+\r
+ return ERR_OK;\r
+}\r
+\r
+/**\r
+ * Should allocate a pbuf and transfer the bytes of the incoming\r
+ * packet from the interface into the pbuf.\r
+ *\r
+ * @param netif the lwip network interface structure for this ethernetif\r
+ * @return a pbuf filled with the received packet (including MAC header)\r
+ * NULL on memory error\r
+ */\r
+static struct pbuf *low_level_input( const unsigned char * const pucInputData, long lDataLength )\r
+{\r
+struct pbuf *p = NULL, *q;\r
+\r
+ if( lDataLength > 0 )\r
+ {\r
+ #if ETH_PAD_SIZE\r
+ len += ETH_PAD_SIZE; /* allow room for Ethernet padding */\r
+ #endif\r
+\r
+ /* We allocate a pbuf chain of pbufs from the pool. */\r
+ p = pbuf_alloc( PBUF_RAW, lDataLength, PBUF_POOL );\r
+ \r
+ if( p != NULL ) \r
+ {\r
+ #if ETH_PAD_SIZE\r
+ pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */\r
+ #endif\r
+\r
+ /* We iterate over the pbuf chain until we have read the entire\r
+ * packet into the pbuf. */\r
+ lDataLength = 0;\r
+ for( q = p; q != NULL; q = q->next ) \r
+ {\r
+ /* Read enough bytes to fill this pbuf in the chain. The\r
+ * available data in the pbuf is given by the q->len\r
+ * variable.\r
+ * This does not necessarily have to be a memcpy, you can also preallocate\r
+ * pbufs for a DMA-enabled MAC and after receiving truncate it to the\r
+ * actually received size. In this case, ensure the tot_len member of the\r
+ * pbuf is the sum of the chained pbuf len members.\r
+ */\r
+ memcpy( q->payload, &( pucInputData[ lDataLength ] ), q->len );\r
+ lDataLength += q->len;\r
+ }\r
+\r
+ #if ETH_PAD_SIZE\r
+ pbuf_header( p, ETH_PAD_SIZE ); /* reclaim the padding word */\r
+ #endif\r
+\r
+ LINK_STATS_INC(link.recv);\r
+ }\r
+ }\r
+\r
+ return p; \r
+}\r
+\r
+/**\r
+ * This function should be called when a packet is ready to be read\r
+ * from the interface. It uses the function low_level_input() that\r
+ * should handle the actual reception of bytes from the network\r
+ * interface. Then the type of the received packet is determined and\r
+ * the appropriate input function is called.\r
+ *\r
+ * @param netif the lwip network interface structure for this ethernetif\r
+ */\r
+static void ethernetif_input( const unsigned char * const pucInputData, long lInputLength )\r
+{\r
+ /* This is taken from lwIP example code and therefore does not conform\r
+ to the FreeRTOS coding standard. */\r
+ \r
+struct eth_hdr *ethhdr;\r
+struct pbuf *p;\r
+\r
+ /* move received packet into a new pbuf */\r
+ p = low_level_input( pucInputData, lInputLength );\r
+ /* no packet could be read, silently ignore this */\r
+ if( p == NULL ) \r
+ {\r
+ return;\r
+ }\r
+\r
+ /* points to packet payload, which starts with an Ethernet header */\r
+ ethhdr = p->payload;\r
+\r
+ switch( htons( ethhdr->type ) ) \r
+ {\r
+ /* IP or ARP packet? */\r
+ case ETHTYPE_IP:\r
+ case ETHTYPE_ARP:\r
+ /* full packet send to tcpip_thread to process */\r
+ if(xlwIPNetif->input( p, xlwIPNetif )!=ERR_OK )\r
+ { \r
+ LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));\r
+ pbuf_free(p);\r
+ p = NULL;\r
+ }\r
+ break;\r
+\r
+ default:\r
+ pbuf_free( p );\r
+ p = NULL;\r
+ break;\r
+ }\r
+}\r
+\r
+/**\r
+ * Should be called at the beginning of the program to set up the\r
+ * network interface. It calls the function low_level_init() to do the\r
+ * actual setup of the hardware.\r
+ *\r
+ * This function should be passed as a parameter to netif_add().\r
+ *\r
+ * @param netif the lwip network interface structure for this ethernetif\r
+ * @return ERR_OK if the loopif is initialized\r
+ * ERR_MEM if private data couldn't be allocated\r
+ * any other err_t on error\r
+ */\r
+err_t ethernetif_init( struct netif *netif )\r
+{\r
+ /* This is taken from lwIP example code and therefore does not conform\r
+ to the FreeRTOS coding standard. */\r
+ \r
+ struct ethernetif *ethernetif;\r
+\r
+ LWIP_ASSERT( "netif != NULL", ( netif != NULL ) );\r
+ \r
+ ethernetif = mem_malloc( sizeof( struct ethernetif ) );\r
+ if (ethernetif == NULL) \r
+ {\r
+ LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_init: out of memory\n"));\r
+ return ERR_MEM;\r
+ }\r
+\r
+ #if LWIP_NETIF_HOSTNAME\r
+ /* Initialize interface hostname */\r
+ netif->hostname = "lwip";\r
+ #endif /* LWIP_NETIF_HOSTNAME */\r
+\r
+ netif->state = ethernetif;\r
+ netif->name[0] = IFNAME0;\r
+ netif->name[1] = IFNAME1;\r
+\r
+ /* We directly use etharp_output() here to save a function call.\r
+ * You can instead declare your own function an call etharp_output()\r
+ * from it if you have to do some checks before sending (e.g. if link\r
+ * is available...) */\r
+ netif->output = etharp_output;\r
+ netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_IGMP;\r
+ netif->hwaddr_len = ETHARP_HWADDR_LEN;\r
+ netif->mtu = netifMAX_MTU;\r
+ netif->linkoutput = low_level_output;\r
+\r
+ ethernetif->ethaddr = ( struct eth_addr * ) &( netif->hwaddr[ 0 ] );\r
+ \r
+ /* initialize the hardware */\r
+ low_level_init( netif );\r
+\r
+ return ERR_OK;\r
+}\r
+/*-----------------------------------------------------------*/\r
+\r
+static pcap_if_t * prvPrintAvailableNetworkInterfaces( void )\r
+{ \r
+pcap_if_t * pxAllNetworkInterfaces = NULL, *xInterface;\r
+long lInterfaceNumber = 1;\r
+\r
+ if( pcap_findalldevs_ex( PCAP_SRC_IF_STRING, NULL, &pxAllNetworkInterfaces, cErrorBuffer ) == -1 )\r
+ {\r
+ printf( "\r\nCould not obtain a list of network interfaces\r\n%s\r\n", cErrorBuffer );\r
+ pxAllNetworkInterfaces = NULL;\r
+ }\r
+\r
+ if( pxAllNetworkInterfaces != NULL )\r
+ {\r
+ /* Print out the list of network interfaces. The first in the list\r
+ is interface '1', not interface '0'. */\r
+ for( xInterface = pxAllNetworkInterfaces; xInterface != NULL; xInterface = xInterface->next )\r
+ {\r
+ printf( "%d. %s", lInterfaceNumber, xInterface->name );\r
+ \r
+ if( xInterface->description != NULL )\r
+ {\r
+ printf( " (%s)\r\n", xInterface->description );\r
+ }\r
+ else\r
+ {\r
+ printf( " (No description available)\r\n") ;\r
+ }\r
+ \r
+ lInterfaceNumber++;\r
+ }\r
+ }\r
+\r
+ if( lInterfaceNumber == 1 )\r
+ {\r
+ /* The interface number was never incremented, so the above for() loop\r
+ did not execute meaning no interfaces were found. */\r
+ printf( " \r\nNo network interfaces were found.\r\n" );\r
+ pxAllNetworkInterfaces = NULL;\r
+ }\r
+\r
+ printf( "\r\nThe interface that will be opened is set by configNETWORK_INTERFACE_TO_USE which should be defined in FreeRTOSConfig.h\r\n" );\r
+ printf( "Attempting to open interface number %d.\r\n", configNETWORK_INTERFACE_TO_USE );\r
+ \r
+ if( ( configNETWORK_INTERFACE_TO_USE < 1L ) || ( configNETWORK_INTERFACE_TO_USE > lInterfaceNumber ) )\r
+ {\r
+ printf("\r\nconfigNETWORK_INTERFACE_TO_USE is not in the valid range.\r\n" );\r
+ \r
+ if( pxAllNetworkInterfaces != NULL )\r
+ {\r
+ /* Free the device list, as no devices are going to be opened. */\r
+ pcap_freealldevs( pxAllNetworkInterfaces );\r
+ pxAllNetworkInterfaces = NULL;\r
+ }\r
+ }\r
+\r
+ return pxAllNetworkInterfaces;\r
+}\r
+/*-----------------------------------------------------------*/\r
+\r
+static void prvOpenSelectedNetworkInterface( pcap_if_t *pxAllNetworkInterfaces )\r
+{\r
+pcap_if_t *xInterface;\r
+long x;\r
+\r
+ /* Walk the list of devices until the selected device is located. */\r
+ xInterface = pxAllNetworkInterfaces;\r
+ for( x = 0L; x < ( configNETWORK_INTERFACE_TO_USE - 1L ); x++ )\r
+ {\r
+ xInterface = xInterface->next;\r
+ }\r
+\r
+ /* Open the selected interface. */\r
+ pxOpenedInterfaceHandle = pcap_open( xInterface->name, /* The name of the selected interface. */\r
+ netifMAX_MTU, /* The size of the packet to capture. */\r
+ PCAP_OPENFLAG_PROMISCUOUS, /* Open in promiscious mode as the MAC and \r
+ IP address is going to be "simulated", and \r
+ not be the real MAC and IP address. This allows\r
+ trafic to the simulated IP address to be routed\r
+ to uIP, and trafic to the real IP address to be\r
+ routed to the Windows TCP/IP stack. */\r
+ 0L, /* The read time out. This is going to block\r
+ until data is available. */\r
+ NULL, /* No authentication is required as this is\r
+ not a remote capture session. */\r
+ cErrorBuffer \r
+ );\r
+ \r
+ if ( pxOpenedInterfaceHandle == NULL )\r
+ {\r
+ printf( "\r\n%s is not supported by WinPcap and cannot be opened\r\n", xInterface->name );\r
+ }\r
+ else\r
+ {\r
+ /* Configure the capture filter to allow blocking reads, and to filter \r
+ out packets that are not of interest to this demo. */\r
+ prvConfigureCaptureBehaviour();\r
+ }\r
+\r
+ /* The device list is no longer required. */\r
+ pcap_freealldevs( pxAllNetworkInterfaces );\r
+}\r
+/*-----------------------------------------------------------*/\r
+\r
+static void prvInterruptSimulator( void *pvParameters )\r
+{\r
+static struct pcap_pkthdr *pxHeader;\r
+const unsigned char *pucPacketData;\r
+extern xQueueHandle xEMACEventQueue;\r
+long lResult;\r
+\r
+ /* Just to kill the compiler warning. */\r
+ ( void ) pvParameters;\r
+\r
+ for( ;; )\r
+ {\r
+ /* Get the next packet. */\r
+ lResult = pcap_next_ex( pxOpenedInterfaceHandle, &pxHeader, &pucPacketData );\r
+ if( lResult == 1 )\r
+ {\r
+ if( xlwIPNetif != NULL )\r
+ {\r
+ ethernetif_input( pucPacketData, pxHeader->len );\r
+ }\r
+ }\r
+ else\r
+ {\r
+ /* There is no real way of simulating an interrupt. \r
+ Make sure other tasks can run. */\r
+ vTaskDelay( 5 );\r
+ }\r
+ }\r
+}\r
+/*-----------------------------------------------------------*/\r
+\r
+static void prvConfigureCaptureBehaviour( void )\r
+{\r
+struct bpf_program xFilterCode;\r
+const long lMinBytesToCopy = 10L, lBlocking = 1L;\r
+unsigned long ulNetMask;\r
+\r
+ /* Unblock a read as soon as anything is received. */\r
+ pcap_setmintocopy( pxOpenedInterfaceHandle, lMinBytesToCopy );\r
+\r
+ /* Allow blocking. */\r
+ pcap_setnonblock( pxOpenedInterfaceHandle, lBlocking, cErrorBuffer );\r
+\r
+ /* Set up a filter so only the packets of interest are passed to the lwIP\r
+ stack. cErrorBuffer is used for convenience to create the string. Don't\r
+ confuse this with an error message. */\r
+ sprintf( cErrorBuffer, "broadcast or multicast or host %d.%d.%d.%d", configIP_ADDR0, configIP_ADDR1, configIP_ADDR2, configIP_ADDR3 );\r
+\r
+ ulNetMask = ( configNET_MASK3 << 24UL ) | ( configNET_MASK2 << 16UL ) | ( configNET_MASK1 << 8L ) | configNET_MASK0;\r
+\r
+ if( pcap_compile(pxOpenedInterfaceHandle, &xFilterCode, cErrorBuffer, 1, ulNetMask ) < 0 )\r
+ {\r
+ printf("\r\nThe packet filter string is invalid\r\n" );\r
+ }\r
+ else\r
+ { \r
+ if( pcap_setfilter( pxOpenedInterfaceHandle, &xFilterCode ) < 0 )\r
+ {\r
+ printf( "\r\nAn error occurred setting the packet filter.\r\n" );\r
+ }\r
+ }\r
+\r
+ /* Create a task that simulates an interrupt in a real system. This will\r
+ block waiting for packets, then send a message to the uIP task when data\r
+ is available. */\r
+ xTaskCreate( prvInterruptSimulator, ( signed char * ) "MAC_ISR", configMINIMAL_STACK_SIZE, NULL, configMAC_ISR_SIMULATOR_PRIORITY, NULL );\r
+}\r
+\r
--- /dev/null
+#pragma pack(push,1)
--- /dev/null
+/*
+ * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __ARCH_CC_H__
+#define __ARCH_CC_H__
+
+#if 1
+/* Include some files for defining library routines */
+#include <stdio.h> /* printf, fflush, FILE */
+#include <stdlib.h> /* abort */
+#else
+/* Declare fuction prototypes for assert/diag/error - leads to some warnings,
+ * but good to test if no includes are missing. */
+int printf(const char *format, ...);
+void abort(void);
+struct _iobuf;
+typedef struct _iobuf FILE;
+int fflush(FILE *stream);
+#endif
+
+
+
+/** @todo fix some warnings: don't use #pragma if compiling with cygwin gcc */
+#ifndef __GNUC__
+#include <limits.h>
+#pragma warning (disable: 4244) /* disable conversion warning (implicit integer promotion!) */
+#pragma warning (disable: 4127) /* conditional expression is constant */
+#pragma warning (disable: 4996) /* 'strncpy' was declared deprecated */
+#pragma warning (disable: 4103) /* structure packing changed by including file */
+#endif
+
+#define LWIP_PROVIDE_ERRNO
+
+/* Define platform endianness (might already be defined) */
+#ifndef BYTE_ORDER
+#define BYTE_ORDER LITTLE_ENDIAN
+#endif /* BYTE_ORDER */
+
+/* Define generic types used in lwIP */
+typedef unsigned char u8_t;
+typedef signed char s8_t;
+typedef unsigned short u16_t;
+typedef signed short s16_t;
+typedef unsigned long u32_t;
+typedef signed long s32_t;
+
+typedef size_t mem_ptr_t;
+typedef u32_t sys_prot_t;
+
+/* Define (sn)printf formatters for these lwIP types */
+#define X8_F "02x"
+#define U16_F "hu"
+#define S16_F "hd"
+#define X16_F "hx"
+#define U32_F "lu"
+#define S32_F "ld"
+#define X32_F "lx"
+#define SZT_F U32_F
+
+/* Compiler hints for packing structures */
+#define PACK_STRUCT_STRUCT
+#define PACK_STRUCT_USE_INCLUDES
+
+/* Plaform specific diagnostic output */
+#define LWIP_PLATFORM_DIAG(x) do { printf x; } while(0)
+
+#define LWIP_PLATFORM_ASSERT(x) do { printf("Assertion \"%s\" failed at line %d in %s\n", \
+ x, __LINE__, __FILE__); fflush(NULL); abort(); } while(0)
+
+#define LWIP_ERROR(message, expression, handler) do { if (!(expression)) { \
+ printf("Assertion \"%s\" failed at line %d in %s\n", message, __LINE__, __FILE__); \
+ fflush(NULL);handler;} } while(0)
+
+/* C runtime functions redefined */
+#define snprintf _snprintf
+
+u32_t dns_lookup_external_hosts_file(const char *name);
+
+#define LWIP_RAND() ((u32_t)rand())
+
+#endif /* __ARCH_CC_H__ */
--- /dev/null
+#pragma pack(pop)
--- /dev/null
+/*
+ * Copyright (c) 2001, Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __PERF_H__
+#define __PERF_H__
+
+#define PERF_START /* null definition */
+#define PERF_STOP(x) /* null definition */
+
+#endif /* __PERF_H__ */
--- /dev/null
+/*\r
+ * Copyright (c) 2001-2003 Swedish Institute of Computer Science.\r
+ * All rights reserved. \r
+ * \r
+ * Redistribution and use in source and binary forms, with or without modification, \r
+ * are permitted provided that the following conditions are met:\r
+ *\r
+ * 1. Redistributions of source code must retain the above copyright notice,\r
+ * this list of conditions and the following disclaimer.\r
+ * 2. Redistributions in binary form must reproduce the above copyright notice,\r
+ * this list of conditions and the following disclaimer in the documentation\r
+ * and/or other materials provided with the distribution.\r
+ * 3. The name of the author may not be used to endorse or promote products\r
+ * derived from this software without specific prior written permission. \r
+ *\r
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED \r
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF \r
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT \r
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, \r
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT \r
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS \r
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN \r
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING \r
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY \r
+ * OF SUCH DAMAGE.\r
+ *\r
+ * This file is part of the lwIP TCP/IP stack.\r
+ * \r
+ * Author: Adam Dunkels <adam@sics.se>\r
+ *\r
+ */\r
+#ifndef __ARCH_SYS_ARCH_H__\r
+#define __ARCH_SYS_ARCH_H__\r
+\r
+#include "FreeRTOS.h"\r
+#include "task.h"\r
+#include "queue.h"\r
+#include "semphr.h"\r
+\r
+#define SYS_MBOX_NULL (xQueueHandle)0\r
+#define SYS_SEM_NULL (xSemaphoreHandle)0\r
+#define SYS_DEFAULT_THREAD_STACK_DEPTH configMINIMAL_STACK_SIZE\r
+\r
+typedef xSemaphoreHandle sys_sem_t;\r
+typedef xSemaphoreHandle sys_mutex_t;\r
+typedef xQueueHandle sys_mbox_t;\r
+typedef xTaskHandle sys_thread_t;\r
+\r
+typedef struct _sys_arch_state_t\r
+{\r
+ // Task creation data.\r
+ char cTaskName[configMAX_TASK_NAME_LEN];\r
+ unsigned short nStackDepth;\r
+ unsigned short nTaskCount;\r
+} sys_arch_state_t;\r
+\r
+#define sys_mbox_valid( x ) ( (*x == NULL) ? 0 : 1 )\r
+#define sys_mbox_set_invalid( x ) ( *x = NULL )\r
+#define sys_sem_valid( x ) ( (*x == NULL) ? 0 : 1 )\r
+#define sys_sem_set_invalid( x ) ( *x = NULL )\r
+\r
+\r
+#endif /* __ARCH_SYS_ARCH_H__ */\r
+\r
--- /dev/null
+/**
+ * Additional settings for the win32 port.
+ * Copy this to lwipcfg_msvc.h and make the config changes you need.
+ */
+
+/* configuration for this port */
+#define PPP_USERNAME "Admin"
+#define PPP_PASSWORD "pass"
+
+/** Define this to the index of the windows network adapter to use */
+#define PACKET_LIB_ADAPTER_NR 2
+/** Define this to the GUID of the windows network adapter to use
+ * or NOT define this if you want PACKET_LIB_ADAPTER_NR to be used */
+/*#define PACKET_LIB_ADAPTER_GUID "00000000-0000-0000-0000-000000000000"*/
+/*#define PACKET_LIB_GET_ADAPTER_NETADDRESS(addr) IP4_ADDR((addr), 192,168,1,0)*/
+/*#define PACKET_LIB_QUIET*/
+
+#define LWIP_PORT_INIT_IPADDR(addr) IP4_ADDR((addr), 192,168,0,200)
+#define LWIP_PORT_INIT_GW(addr) IP4_ADDR((addr), 192,168,0,3)
+#define LWIP_PORT_INIT_NETMASK(addr) IP4_ADDR((addr), 255,255,255,0)
+
+/* remember to change this MAC address to suit your needs!
+ the last octet will be increased by netif->num for each netif */
+#define LWIP_MAC_ADDR_BASE {0x00,0x01,0x02,0x03,0x04,0x05}
+
+/* configuration for applications */
+
+#define LWIP_CHARGEN_APP 0
+#define LWIP_DNS_APP 0
+#define LWIP_HTTPD_APP 1
+/* Set this to 1 to use the netconn http server,
+ * otherwise the raw api server will be used. */
+/*#define LWIP_HTTPD_APP_NETCONN */
+#define LWIP_NETBIOS_APP 0
+#define LWIP_NETIO_APP 0
+#define LWIP_PING_APP 0
+#define LWIP_RTP_APP 0
+#define LWIP_SHELL_APP 0
+#define LWIP_SNTP_APP 0
+#define LWIP_SOCKET_EXAMPLES_APP 0
+#define LWIP_TCPECHO_APP 0
+/* Set this to 1 to use the netconn tcpecho server,
+ * otherwise the raw api server will be used. */
+/*#define LWIP_TCPECHO_APP_NETCONN */
+#define LWIP_UDPECHO_APP 0
--- /dev/null
+/*\r
+ * Copyright (c) 2001-2003 Swedish Institute of Computer Science.\r
+ * All rights reserved.\r
+ *\r
+ * Redistribution and use in source and binary forms, with or without modification,\r
+ * are permitted provided that the following conditions are met:\r
+ *\r
+ * 1. Redistributions of source code must retain the above copyright notice,\r
+ * this list of conditions and the following disclaimer.\r
+ * 2. Redistributions in binary form must reproduce the above copyright notice,\r
+ * this list of conditions and the following disclaimer in the documentation\r
+ * and/or other materials provided with the distribution.\r
+ * 3. The name of the author may not be used to endorse or promote products\r
+ * derived from this software without specific prior written permission.\r
+ *\r
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED\r
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF\r
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT\r
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,\r
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT\r
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS\r
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN\r
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING\r
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY\r
+ * OF SUCH DAMAGE.\r
+ *\r
+ * This file is part of the lwIP TCP/IP stack.\r
+ *\r
+ * Author: Adam Dunkels <adam@sics.se>\r
+ *\r
+ */\r
+\r
+//*****************************************************************************\r
+//\r
+// Include OS functionality.\r
+//\r
+//*****************************************************************************\r
+\r
+/* ------------------------ System architecture includes ----------------------------- */\r
+#include "arch/sys_arch.h"\r
+\r
+/* ------------------------ lwIP includes --------------------------------- */\r
+#include "lwip/opt.h"\r
+\r
+#include "lwip/debug.h"\r
+#include "lwip/def.h"\r
+#include "lwip/sys.h"\r
+#include "lwip/mem.h"\r
+#include "lwip/stats.h"\r
+\r
+/*---------------------------------------------------------------------------*\r
+ * Globals:\r
+ *---------------------------------------------------------------------------*/\r
+\r
+#if 0\r
+_RB_\r
+struct timeoutlist\r
+{\r
+ struct sys_timeouts timeouts;\r
+ xTaskHandle pid;\r
+};\r
+\r
+/* This is the number of threads that can be started with sys_thread_new() */\r
+#define SYS_THREAD_MAX 4\r
+\r
+static u16_t s_nextthread = 0;\r
+\r
+static struct timeoutlist s_timeoutlist[SYS_THREAD_MAX];\r
+#endif\r
+\r
+/*-----------------------------------------------------------------------------------*/\r
+\r
+/*---------------------------------------------------------------------------*\r
+ * Routine: sys_mbox_new\r
+ *---------------------------------------------------------------------------*\r
+ * Description:\r
+ * Creates a new mailbox\r
+ * Inputs:\r
+ * int size -- Size of elements in the mailbox\r
+ * Outputs:\r
+ * sys_mbox_t -- Handle to new mailbox\r
+ *---------------------------------------------------------------------------*/\r
+err_t sys_mbox_new(sys_mbox_t *mbox, int size)\r
+{\r
+err_t lwip_err= ERR_MEM;\r
+\r
+ *mbox = xQueueCreate( size, sizeof( void * ) );\r
+\r
+ // Created succesfully?\r
+ if(*mbox != NULL)\r
+ {\r
+ lwip_err = ERR_OK;\r
+#if SYS_STATS\r
+ SYS_STATS_INC(mbox.used);\r
+#endif /* SYS_STATS */\r
+ }\r
+\r
+ return lwip_err;\r
+}\r
+\r
+\r
+/*---------------------------------------------------------------------------*\r
+ * Routine: sys_mbox_free\r
+ *---------------------------------------------------------------------------*\r
+ * Description:\r
+ * Deallocates a mailbox. If there are messages still present in the\r
+ * mailbox when the mailbox is deallocated, it is an indication of a\r
+ * programming error in lwIP and the developer should be notified.\r
+ * Inputs:\r
+ * sys_mbox_t mbox -- Handle of mailbox\r
+ * Outputs:\r
+ * sys_mbox_t -- Handle to new mailbox\r
+ *---------------------------------------------------------------------------*/\r
+void sys_mbox_free(sys_mbox_t *mbox)\r
+{\r
+unsigned portBASE_TYPE uxMessagesWaiting;\r
+\r
+ uxMessagesWaiting = uxQueueMessagesWaiting( *mbox );\r
+ configASSERT( ( uxMessagesWaiting == 0 ) );\r
+\r
+#if SYS_STATS\r
+ if (uxMessagesWaiting != 0U)\r
+ {\r
+ SYS_STATS_INC(mbox.err);\r
+ }\r
+\r
+ SYS_STATS_DEC(mbox.used);\r
+#endif /* SYS_STATS */\r
+\r
+ vQueueDelete( *mbox );\r
+}\r
+\r
+/*---------------------------------------------------------------------------*\r
+ * Routine: sys_mbox_post\r
+ *---------------------------------------------------------------------------*\r
+ * Description:\r
+ * Post the "msg" to the mailbox.\r
+ * Inputs:\r
+ * sys_mbox_t mbox -- Handle of mailbox\r
+ * void *data -- Pointer to data to post\r
+ *---------------------------------------------------------------------------*/\r
+void sys_mbox_post(sys_mbox_t *mbox, void *msg)\r
+{\r
+ while( xQueueSendToBack( *mbox, &msg, portMAX_DELAY ) != pdTRUE );\r
+}\r
+\r
+/*---------------------------------------------------------------------------*\r
+ * Routine: sys_mbox_trypost\r
+ *---------------------------------------------------------------------------*\r
+ * Description:\r
+ * Try to post the "msg" to the mailbox. Returns immediately with\r
+ * error if cannot.\r
+ * Inputs:\r
+ * sys_mbox_t mbox -- Handle of mailbox\r
+ * void *msg -- Pointer to data to post\r
+ * Outputs:\r
+ * err_t -- ERR_OK if message posted, else ERR_MEM\r
+ * if not.\r
+ *---------------------------------------------------------------------------*/\r
+err_t sys_mbox_trypost(sys_mbox_t *mbox, void *msg)\r
+{\r
+err_t result;\r
+\r
+ if ( xQueueSend( *mbox, &msg, 0 ) == pdPASS )\r
+ {\r
+ result = ERR_OK;\r
+ }\r
+ else\r
+ {\r
+ // could not post, queue must be full\r
+ result = ERR_MEM;\r
+#if SYS_STATS\r
+ SYS_STATS_INC(mbox.err);\r
+#endif /* SYS_STATS */\r
+ }\r
+ return result;\r
+}\r
+\r
+/*---------------------------------------------------------------------------*\r
+ * Routine: sys_arch_mbox_fetch\r
+ *---------------------------------------------------------------------------*\r
+ * Description:\r
+ * Blocks the thread until a message arrives in the mailbox, but does\r
+ * not block the thread longer than "timeout" milliseconds (similar to\r
+ * the sys_arch_sem_wait() function). The "msg" argument is a result\r
+ * parameter that is set by the function (i.e., by doing "*msg =\r
+ * ptr"). The "msg" parameter maybe NULL to indicate that the message\r
+ * should be dropped.\r
+ *\r
+ * The return values are the same as for the sys_arch_sem_wait() function:\r
+ * Number of milliseconds spent waiting or SYS_ARCH_TIMEOUT if there was a\r
+ * timeout.\r
+ *\r
+ * Note that a function with a similar name, sys_mbox_fetch(), is\r
+ * implemented by lwIP.\r
+ * Inputs:\r
+ * sys_mbox_t mbox -- Handle of mailbox\r
+ * void **msg -- Pointer to pointer to msg received\r
+ * u32_t timeout -- Number of milliseconds until timeout\r
+ * Outputs:\r
+ * u32_t -- SYS_ARCH_TIMEOUT if timeout, else number\r
+ * of milliseconds until received.\r
+ *---------------------------------------------------------------------------*/\r
+u32_t sys_arch_mbox_fetch(sys_mbox_t *mbox, void **msg, u32_t timeout)\r
+{\r
+void *dummyptr;\r
+portTickType StartTime, EndTime, Elapsed;\r
+\r
+ StartTime = xTaskGetTickCount();\r
+\r
+ if (NULL == msg)\r
+ {\r
+ msg = &dummyptr;\r
+ }\r
+\r
+ if (timeout != 0)\r
+ {\r
+ if ( pdTRUE == xQueueReceive( *mbox, &(*msg), timeout / portTICK_RATE_MS ) )\r
+ {\r
+ EndTime = xTaskGetTickCount();\r
+ Elapsed = (EndTime - StartTime) * portTICK_RATE_MS;\r
+\r
+ return ( Elapsed );\r
+ }\r
+ else // timed out blocking for message\r
+ {\r
+ *msg = NULL;\r
+\r
+ return SYS_ARCH_TIMEOUT;\r
+ }\r
+ }\r
+ else\r
+ {\r
+ while( pdTRUE != xQueueReceive( mbox, &(*msg), portMAX_DELAY ) ); // time is arbitrary\r
+ EndTime = xTaskGetTickCount();\r
+ Elapsed = (EndTime - StartTime) * portTICK_RATE_MS;\r
+\r
+ if (Elapsed == 0)\r
+ {\r
+ Elapsed = 1;\r
+ }\r
+\r
+ // return time blocked TBD test\r
+ return (Elapsed);\r
+ }\r
+}\r
+\r
+/*---------------------------------------------------------------------------*\r
+ * Routine: sys_arch_mbox_tryfetch\r
+ *---------------------------------------------------------------------------*\r
+ * Description:\r
+ * Similar to sys_arch_mbox_fetch, but if message is not ready\r
+ * immediately, we'll return with SYS_MBOX_EMPTY. On success, 0 is\r
+ * returned.\r
+ * Inputs:\r
+ * sys_mbox_t mbox -- Handle of mailbox\r
+ * void **msg -- Pointer to pointer to msg received\r
+ * Outputs:\r
+ * u32_t -- SYS_MBOX_EMPTY if no messages. Otherwise,\r
+ * return ERR_OK.\r
+ *---------------------------------------------------------------------------*/\r
+u32_t sys_arch_mbox_tryfetch(sys_mbox_t *mbox, void **msg)\r
+{\r
+ void *dummyptr;\r
+\r
+ if (msg == NULL)\r
+ {\r
+ msg = &dummyptr;\r
+ }\r
+\r
+ if ( pdTRUE == xQueueReceive( *mbox, &(*msg), 0 ) )\r
+ {\r
+ return ERR_OK;\r
+ }\r
+ else\r
+ {\r
+ return SYS_MBOX_EMPTY;\r
+ }\r
+}\r
+\r
+/*---------------------------------------------------------------------------*\r
+ * Routine: sys_sem_new\r
+ *---------------------------------------------------------------------------*\r
+ * Description:\r
+ * Creates and returns a new semaphore. The "count" argument specifies\r
+ * the initial state of the semaphore.\r
+ * NOTE: Currently this routine only creates counts of 1 or 0\r
+ * Inputs:\r
+ * sys_mbox_t mbox -- Handle of mailbox\r
+ * u8_t count -- Initial count of semaphore (1 or 0)\r
+ * Outputs:\r
+ * sys_sem_t -- Created semaphore or 0 if could not create.\r
+ *---------------------------------------------------------------------------*/\r
+err_t sys_sem_new(sys_sem_t *sem, u8_t count)\r
+{\r
+ err_t lwip_err = ERR_MEM;\r
+\r
+ vSemaphoreCreateBinary( (*sem) );\r
+\r
+ if( *sem != NULL )\r
+ {\r
+ // Means it can't be taken\r
+ if (count == 0)\r
+ {\r
+ xSemaphoreTake(*sem, 1);\r
+ }\r
+\r
+ lwip_err = ERR_OK;\r
+\r
+#if SYS_STATS\r
+ SYS_STATS_INC(sem.used);\r
+#endif\r
+ }\r
+ else\r
+ {\r
+#if SYS_STATS\r
+ SYS_STATS_INC(sem.err);\r
+#endif\r
+ }\r
+\r
+ return lwip_err;\r
+}\r
+\r
+/*---------------------------------------------------------------------------*\r
+ * Routine: sys_arch_sem_wait\r
+ *---------------------------------------------------------------------------*\r
+ * Description:\r
+ * Blocks the thread while waiting for the semaphore to be\r
+ * signaled. If the "timeout" argument is non-zero, the thread should\r
+ * only be blocked for the specified time (measured in\r
+ * milliseconds).\r
+ *\r
+ * If the timeout argument is non-zero, the return value is the number of\r
+ * milliseconds spent waiting for the semaphore to be signaled. If the\r
+ * semaphore wasn't signaled within the specified time, the return value is\r
+ * SYS_ARCH_TIMEOUT. If the thread didn't have to wait for the semaphore\r
+ * (i.e., it was already signaled), the function may return zero.\r
+ *\r
+ * Notice that lwIP implements a function with a similar name,\r
+ * sys_sem_wait(), that uses the sys_arch_sem_wait() function.\r
+ * Inputs:\r
+ * sys_sem_t sem -- Semaphore to wait on\r
+ * u32_t timeout -- Number of milliseconds until timeout\r
+ * Outputs:\r
+ * u32_t -- Time elapsed or SYS_ARCH_TIMEOUT.\r
+ *---------------------------------------------------------------------------*/\r
+u32_t sys_arch_sem_wait(sys_sem_t *sem, u32_t timeout)\r
+{\r
+portTickType StartTime, EndTime, Elapsed;\r
+\r
+ StartTime = xTaskGetTickCount();\r
+\r
+ if (timeout != 0)\r
+ {\r
+ if( xSemaphoreTake( *sem, timeout / portTICK_RATE_MS ) == pdTRUE )\r
+ {\r
+ EndTime = xTaskGetTickCount();\r
+ Elapsed = (EndTime - StartTime) * portTICK_RATE_MS;\r
+\r
+ return (Elapsed); // return time blocked TODO test\r
+ }\r
+ else\r
+ {\r
+ return SYS_ARCH_TIMEOUT;\r
+ }\r
+\r
+ }\r
+ else\r
+ {\r
+ while( xSemaphoreTake( sem, portMAX_DELAY ) != pdTRUE );\r
+ EndTime = xTaskGetTickCount();\r
+ Elapsed = (EndTime - StartTime) * portTICK_RATE_MS;\r
+\r
+ if (Elapsed == 0)\r
+ {\r
+ Elapsed = 1;\r
+ }\r
+\r
+ // return time blocked\r
+ return (Elapsed);\r
+ }\r
+}\r
+\r
+/** Create a new mutex\r
+ * @param mutex pointer to the mutex to create\r
+ * @return a new mutex */\r
+err_t sys_mutex_new(sys_mutex_t *mutex) \r
+{\r
+err_t lwip_err = ERR_MEM;\r
+\r
+ *mutex = xQueueCreateMutex();\r
+\r
+ if( *mutex != NULL ) \r
+ {\r
+ lwip_err = ERR_OK;\r
+#if SYS_STATS\r
+ SYS_STATS_INC(mutex.used);\r
+#endif\r
+ } \r
+ else \r
+ {\r
+#if SYS_STATS\r
+ SYS_STATS_INC(mutex.err);\r
+#endif\r
+ }\r
+ \r
+ return lwip_err;\r
+}\r
+\r
+/** Lock a mutex\r
+ * @param mutex the mutex to lock */\r
+void sys_mutex_lock(sys_mutex_t *mutex)\r
+{\r
+ while( xSemaphoreTake( *mutex, portMAX_DELAY ) != pdPASS );\r
+}\r
+\r
+/** Unlock a mutex\r
+ * @param mutex the mutex to unlock */\r
+void sys_mutex_unlock(sys_mutex_t *mutex)\r
+{\r
+ xSemaphoreGive(*mutex);\r
+}\r
+\r
+\r
+/** Delete a semaphore\r
+ * @param mutex the mutex to delete */\r
+void sys_mutex_free(sys_mutex_t *mutex)\r
+{\r
+#if SYS_STATS\r
+ SYS_STATS_DEC(mutex.used);\r
+#endif /* SYS_STATS */\r
+ vQueueDelete(*mutex);\r
+}\r
+\r
+\r
+/*---------------------------------------------------------------------------*\r
+ * Routine: sys_sem_signal\r
+ *---------------------------------------------------------------------------*\r
+ * Description:\r
+ * Signals (releases) a semaphore\r
+ * Inputs:\r
+ * sys_sem_t sem -- Semaphore to signal\r
+ *---------------------------------------------------------------------------*/\r
+void sys_sem_signal(sys_sem_t * sem)\r
+{\r
+ //LWIP_ASSERT( "sys_sem_signal: sem != SYS_SEM_NULL", sem != SYS_SEM_NULL );\r
+ xSemaphoreGive(*sem);\r
+}\r
+\r
+/*---------------------------------------------------------------------------*\r
+ * Routine: sys_sem_free\r
+ *---------------------------------------------------------------------------*\r
+ * Description:\r
+ * Deallocates a semaphore\r
+ * Inputs:\r
+ * sys_sem_t sem -- Semaphore to free\r
+ *---------------------------------------------------------------------------*/\r
+void sys_sem_free(sys_sem_t * sem)\r
+{\r
+ //LWIP_ASSERT( "sys_sem_free: sem != SYS_SEM_NULL", sem != SYS_SEM_NULL );\r
+\r
+#if SYS_STATS\r
+ SYS_STATS_DEC(sem.used);\r
+#endif /* SYS_STATS */\r
+\r
+ vQueueDelete(*sem);\r
+}\r
+\r
+/*---------------------------------------------------------------------------*\r
+ * Routine: sys_init\r
+ *---------------------------------------------------------------------------*\r
+ * Description:\r
+ * Initialize sys arch\r
+ *---------------------------------------------------------------------------*/\r
+void sys_init(void)\r
+{\r
+#if 0\r
+ int i;\r
+\r
+ // Initialize the the per-thread sys_timeouts structures\r
+ // make sure there are no valid pids in the list\r
+ for (i = 0; i < SYS_THREAD_MAX; i++)\r
+ {\r
+ s_timeoutlist[i].pid = SYS_THREAD_NULL;\r
+ // s_timeoutlist[i].timeouts.next = NULL;\r
+ }\r
+\r
+ // keep track of how many threads have been created\r
+ s_nextthread = 0;\r
+#endif\r
+}\r
+\r
+u32_t sys_now(void)\r
+{\r
+ return xTaskGetTickCount();\r
+}\r
+\r
+#if 0\r
+_RB_\r
+u32_t sys_jiffies(void)\r
+{\r
+ return UEZTickCounterGet();\r
+}\r
+#endif\r
+\r
+/*---------------------------------------------------------------------------*\r
+ * Routine: sys_arch_timeouts\r
+ *---------------------------------------------------------------------------*\r
+ * Description:\r
+ * Returns a pointer to the per-thread sys_timeouts structure. In lwIP,\r
+ * each thread has a list of timeouts which is represented as a linked\r
+ * list of sys_timeout structures. The sys_timeouts structure holds a\r
+ * pointer to a linked list of timeouts. This function is called by\r
+ * the lwIP timeout scheduler and must not return a NULL value.\r
+ *\r
+ * In a single threaded sys_arch implementation, this function will\r
+ * simply return a pointer to a global sys_timeouts variable stored in\r
+ * the sys_arch module.\r
+ * Outputs:\r
+ * sys_timeouts * -- Pointer to per-thread timeouts.\r
+ *---------------------------------------------------------------------------*/\r
+#if 0\r
+struct sys_timeouts *sys_arch_timeouts(void)\r
+{\r
+ int i;\r
+ T_uezTask pid;\r
+ struct timeoutlist *tl;\r
+\r
+ pid = UEZTaskGetCurrent();\r
+\r
+ for (i = 0; i < s_nextthread; i++)\r
+ {\r
+ tl = &(s_timeoutlist[i]);\r
+ if (tl->pid == pid)\r
+ {\r
+ // return &(tl->timeouts);\r
+ }\r
+ }\r
+\r
+ // Error\r
+ return NULL;\r
+}\r
+#endif\r
+/*---------------------------------------------------------------------------*\r
+ * Routine: sys_thread_new\r
+ *---------------------------------------------------------------------------*\r
+ * Description:\r
+ * Starts a new thread with priority "prio" that will begin its\r
+ * execution in the function "thread()". The "arg" argument will be\r
+ * passed as an argument to the thread() function. The id of the new\r
+ * thread is returned. Both the id and the priority are system\r
+ * dependent.\r
+ * Inputs:\r
+ * char *name -- Name of thread\r
+ * void (* thread)(void *arg) -- Pointer to function to run.\r
+ * void *arg -- Argument passed into function\r
+ * int stacksize -- Required stack amount in bytes\r
+ * int prio -- Thread priority\r
+ * Outputs:\r
+ * sys_thread_t -- Pointer to per-thread timeouts.\r
+ *---------------------------------------------------------------------------*/\r
+sys_thread_t sys_thread_new(const char *name, void(* thread)(void *arg), void *arg, int stacksize, int prio)\r
+{\r
+xTaskHandle CreatedTask;\r
+int result;\r
+\r
+ result = xTaskCreate( thread, ( signed portCHAR * ) name, stacksize, arg, prio, &CreatedTask );\r
+\r
+ if(result == pdPASS)\r
+ {\r
+ return CreatedTask;\r
+ }\r
+ else\r
+ {\r
+ return NULL;\r
+ }\r
+}\r
+\r
+/*---------------------------------------------------------------------------*\r
+ * Routine: sys_arch_protect\r
+ *---------------------------------------------------------------------------*\r
+ * Description:\r
+ * This optional function does a "fast" critical region protection and\r
+ * returns the previous protection level. This function is only called\r
+ * during very short critical regions. An embedded system which supports\r
+ * ISR-based drivers might want to implement this function by disabling\r
+ * interrupts. Task-based systems might want to implement this by using\r
+ * a mutex or disabling tasking. This function should support recursive\r
+ * calls from the same task or interrupt. In other words,\r
+ * sys_arch_protect() could be called while already protected. In\r
+ * that case the return value indicates that it is already protected.\r
+ *\r
+ * sys_arch_protect() is only required if your port is supporting an\r
+ * operating system.\r
+ * Outputs:\r
+ * sys_prot_t -- Previous protection level (not used here)\r
+ *---------------------------------------------------------------------------*/\r
+sys_prot_t sys_arch_protect(void)\r
+{\r
+ vPortEnterCritical();\r
+ return 1;\r
+}\r
+\r
+/*---------------------------------------------------------------------------*\r
+ * Routine: sys_arch_unprotect\r
+ *---------------------------------------------------------------------------*\r
+ * Description:\r
+ * This optional function does a "fast" set of critical region\r
+ * protection to the value specified by pval. See the documentation for\r
+ * sys_arch_protect() for more information. This function is only\r
+ * required if your port is supporting an operating system.\r
+ * Inputs:\r
+ * sys_prot_t -- Previous protection level (not used here)\r
+ *---------------------------------------------------------------------------*/\r
+void sys_arch_unprotect(sys_prot_t pval)\r
+{\r
+ (void) pval;\r
+ taskEXIT_CRITICAL();\r
+}\r
+\r
+/*\r
+ * Prints an assertion messages and aborts execution.\r
+ */\r
+void sys_assert(const char *msg)\r
+{\r
+ (void) msg;\r
+\r
+ for (;;)\r
+ {\r
+ }\r
+}\r
+/*-------------------------------------------------------------------------*\r
+ * End of File: sys_arch.c\r
+ *-------------------------------------------------------------------------*/\r
+\r
projects / freertos / commitdiff