4 * Implementation of raw protocol PCBs for low-level handling of
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5 * different types of protocols besides (or overriding) those
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6 * already available in lwIP.
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10 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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11 * All rights reserved.
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13 * Redistribution and use in source and binary forms, with or without modification,
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14 * are permitted provided that the following conditions are met:
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16 * 1. Redistributions of source code must retain the above copyright notice,
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17 * this list of conditions and the following disclaimer.
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18 * 2. Redistributions in binary form must reproduce the above copyright notice,
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19 * this list of conditions and the following disclaimer in the documentation
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20 * and/or other materials provided with the distribution.
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21 * 3. The name of the author may not be used to endorse or promote products
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22 * derived from this software without specific prior written permission.
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24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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27 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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29 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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35 * This file is part of the lwIP TCP/IP stack.
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37 * Author: Adam Dunkels <adam@sics.se>
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43 #include "lwip/opt.h"
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45 #include "lwip/def.h"
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46 #include "lwip/memp.h"
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47 #include "lwip/inet.h"
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48 #include "lwip/ip_addr.h"
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49 #include "lwip/netif.h"
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50 #include "lwip/raw.h"
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52 #include "lwip/stats.h"
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54 #include "arch/perf.h"
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55 #include "lwip/snmp.h"
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59 /** The list of RAW PCBs */
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60 static struct raw_pcb *raw_pcbs = NULL;
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69 * Determine if in incoming IP packet is covered by a RAW PCB
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70 * and if so, pass it to a user-provided receive callback function.
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72 * Given an incoming IP datagram (as a chain of pbufs) this function
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73 * finds a corresponding RAW PCB and calls the corresponding receive
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74 * callback function.
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76 * @param pbuf pbuf to be demultiplexed to a RAW PCB.
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77 * @param netif network interface on which the datagram was received.
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78 * @Return - 1 if the packet has been eaten by a RAW PCB receive
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79 * callback function. The caller MAY NOT not reference the
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80 * packet any longer, and MAY NOT call pbuf_free().
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81 * @return - 0 if packet is not eaten (pbuf is still referenced by the
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86 raw_input(struct pbuf *p, struct netif *inp)
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88 struct raw_pcb *pcb;
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89 struct ip_hdr *iphdr;
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96 proto = IPH_PROTO(iphdr);
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99 /* loop through all raw pcbs until the packet is eaten by one */
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100 /* this allows multiple pcbs to match against the packet by design */
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101 while ((eaten == 0) && (pcb != NULL)) {
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102 if (pcb->protocol == proto) {
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103 /* receive callback function available? */
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104 if (pcb->recv != NULL) {
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105 /* the receive callback function did not eat the packet? */
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106 if (pcb->recv(pcb->recv_arg, pcb, p, &(iphdr->src)) != 0)
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108 /* receive function ate the packet */
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113 /* no receive callback function was set for this raw PCB */
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114 /* drop the packet */
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124 * @param pcb RAW PCB to be bound with a local address ipaddr.
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125 * @param ipaddr local IP address to bind with. Use IP_ADDR_ANY to
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126 * bind to all local interfaces.
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128 * @return lwIP error code.
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129 * - ERR_OK. Successful. No error occured.
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130 * - ERR_USE. The specified IP address is already bound to by
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133 * @see raw_disconnect()
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136 raw_bind(struct raw_pcb *pcb, struct ip_addr *ipaddr)
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138 ip_addr_set(&pcb->local_ip, ipaddr);
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143 * Connect an RAW PCB. This function is required by upper layers
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144 * of lwip. Using the raw api you could use raw_sendto() instead
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146 * This will associate the RAW PCB with the remote address.
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148 * @param pcb RAW PCB to be connected with remote address ipaddr and port.
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149 * @param ipaddr remote IP address to connect with.
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151 * @return lwIP error code
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153 * @see raw_disconnect() and raw_sendto()
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156 raw_connect(struct raw_pcb *pcb, struct ip_addr *ipaddr)
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158 ip_addr_set(&pcb->remote_ip, ipaddr);
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164 * Set the callback function for received packets that match the
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165 * raw PCB's protocol and binding.
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167 * The callback function MUST either
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168 * - eat the packet by calling pbuf_free() and returning non-zero. The
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169 * packet will not be passed to other raw PCBs or other protocol layers.
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170 * - not free the packet, and return zero. The packet will be matched
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171 * against further PCBs and/or forwarded to another protocol layers.
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173 * @return non-zero if the packet was free()d, zero if the packet remains
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174 * available for others.
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177 raw_recv(struct raw_pcb *pcb,
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178 u8_t (* recv)(void *arg, struct raw_pcb *upcb, struct pbuf *p,
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179 struct ip_addr *addr),
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182 /* remember recv() callback and user data */
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184 pcb->recv_arg = recv_arg;
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188 * Send the raw IP packet to the given address. Note that actually you cannot
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189 * modify the IP headers (this is inconsistent with the receive callback where
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190 * you actually get the IP headers), you can only specify the IP payload here.
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191 * It requires some more changes in lwIP. (there will be a raw_send() function
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194 * @param pcb the raw pcb which to send
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195 * @param p the IP payload to send
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196 * @param ipaddr the destination address of the IP packet
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200 raw_sendto(struct raw_pcb *pcb, struct pbuf *p, struct ip_addr *ipaddr)
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203 struct netif *netif;
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204 struct ip_addr *src_ip;
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205 struct pbuf *q; /* q will be sent down the stack */
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207 LWIP_DEBUGF(RAW_DEBUG | DBG_TRACE | 3, ("raw_sendto\n"));
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209 /* not enough space to add an IP header to first pbuf in given p chain? */
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210 if (pbuf_header(p, IP_HLEN)) {
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211 /* allocate header in new pbuf */
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212 q = pbuf_alloc(PBUF_IP, 0, PBUF_RAM);
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213 /* new header pbuf could not be allocated? */
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215 LWIP_DEBUGF(RAW_DEBUG | DBG_TRACE | 2, ("raw_sendto: could not allocate header\n"));
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218 /* chain header q in front of given pbuf p */
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220 /* { first pbuf q points to header pbuf } */
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221 LWIP_DEBUGF(RAW_DEBUG, ("raw_sendto: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
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223 /* first pbuf q equals given pbuf */
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225 pbuf_header(q, -IP_HLEN);
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228 if ((netif = ip_route(ipaddr)) == NULL) {
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229 LWIP_DEBUGF(RAW_DEBUG | 1, ("raw_sendto: No route to 0x%lx\n", ipaddr->addr));
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231 /* ++lwip_stats.raw.rterr;*/
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232 #endif /* RAW_STATS */
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233 /* free any temporary header pbuf allocated by pbuf_header() */
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240 if (ip_addr_isany(&pcb->local_ip)) {
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241 /* use outgoing network interface IP address as source address */
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242 src_ip = &(netif->ip_addr);
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244 /* use RAW PCB local IP address as source address */
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245 src_ip = &(pcb->local_ip);
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248 err = ip_output_if (q, src_ip, ipaddr, pcb->ttl, pcb->tos, pcb->protocol, netif);
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250 /* did we chain a header earlier? */
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252 /* free the header */
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259 * Send the raw IP packet to the address given by raw_connect()
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261 * @param pcb the raw pcb which to send
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262 * @param p the IP payload to send
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263 * @param ipaddr the destination address of the IP packet
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267 raw_send(struct raw_pcb *pcb, struct pbuf *p)
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269 return raw_sendto(pcb, p, &pcb->remote_ip);
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273 * Remove an RAW PCB.
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275 * @param pcb RAW PCB to be removed. The PCB is removed from the list of
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276 * RAW PCB's and the data structure is freed from memory.
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281 raw_remove(struct raw_pcb *pcb)
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283 struct raw_pcb *pcb2;
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284 /* pcb to be removed is first in list? */
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285 if (raw_pcbs == pcb) {
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286 /* make list start at 2nd pcb */
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287 raw_pcbs = raw_pcbs->next;
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288 /* pcb not 1st in list */
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289 } else for(pcb2 = raw_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
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290 /* find pcb in raw_pcbs list */
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291 if (pcb2->next != NULL && pcb2->next == pcb) {
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292 /* remove pcb from list */
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293 pcb2->next = pcb->next;
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296 memp_free(MEMP_RAW_PCB, pcb);
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300 * Create a RAW PCB.
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302 * @return The RAW PCB which was created. NULL if the PCB data structure
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303 * could not be allocated.
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305 * @param proto the protocol number of the IPs payload (e.g. IP_PROTO_ICMP)
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307 * @see raw_remove()
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310 raw_new(u16_t proto) {
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311 struct raw_pcb *pcb;
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313 LWIP_DEBUGF(RAW_DEBUG | DBG_TRACE | 3, ("raw_new\n"));
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315 pcb = memp_malloc(MEMP_RAW_PCB);
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316 /* could allocate RAW PCB? */
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318 /* initialize PCB to all zeroes */
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319 memset(pcb, 0, sizeof(struct raw_pcb));
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320 pcb->protocol = proto;
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321 pcb->ttl = RAW_TTL;
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322 pcb->next = raw_pcbs;
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328 #endif /* LWIP_RAW */
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