4 * lwIP network interface abstraction
8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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12 * are permitted provided that the following conditions are met:
14 * 1. Redistributions of source code must retain the above copyright notice,
15 * this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright notice,
17 * this list of conditions and the following disclaimer in the documentation
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22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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33 * This file is part of the lwIP TCP/IP stack.
35 * Author: Adam Dunkels <adam@sics.se>
42 #include "lwip/ip_addr.h"
43 #include "lwip/netif.h"
46 struct netif *netif_list = NULL;
47 struct netif *netif_default = NULL;
50 * Add a network interface to the list of lwIP netifs.
52 * @param netif a pre-allocated netif structure
53 * @param ipaddr IP address for the new netif
54 * @param netmask network mask for the new netif
55 * @param gw default gateway IP address for the new netif
56 * @param state opaque data passed to the new netif
57 * @param init callback function that initializes the interface
58 * @param input callback function that is called to pass
59 * ingress packets up in the protocol layer stack.
61 * @return netif, or NULL if failed.
64 netif_add(struct netif *netif, struct ip_addr *ipaddr, struct ip_addr *netmask,
67 err_t (* init)(struct netif *netif),
68 err_t (* input)(struct pbuf *p, struct netif *netif))
70 static s16_t netifnum = 0;
73 /* netif not under DHCP control by default */
76 /* remember netif specific state information data */
78 netif->num = netifnum++;
81 netif_set_addr(netif, ipaddr, netmask, gw);
83 /* call user specified initialization function for netif */
84 if (init(netif) != ERR_OK) {
88 /* add this netif to the list */
89 netif->next = netif_list;
91 LWIP_DEBUGF(NETIF_DEBUG, ("netif: added interface %c%c IP addr ",
92 netif->name[0], netif->name[1]));
93 ip_addr_debug_print(NETIF_DEBUG, ipaddr);
94 LWIP_DEBUGF(NETIF_DEBUG, (" netmask "));
95 ip_addr_debug_print(NETIF_DEBUG, netmask);
96 LWIP_DEBUGF(NETIF_DEBUG, (" gw "));
97 ip_addr_debug_print(NETIF_DEBUG, gw);
98 LWIP_DEBUGF(NETIF_DEBUG, ("\n"));
103 netif_set_addr(struct netif *netif,struct ip_addr *ipaddr, struct ip_addr *netmask,
106 netif_set_ipaddr(netif, ipaddr);
107 netif_set_netmask(netif, netmask);
108 netif_set_gw(netif, gw);
111 void netif_remove(struct netif * netif)
113 if ( netif == NULL ) return;
115 /* is it the first netif? */
116 if (netif_list == netif) {
117 netif_list = netif->next;
120 /* look for netif further down the list */
121 struct netif * tmpNetif;
122 for (tmpNetif = netif_list; tmpNetif != NULL; tmpNetif = tmpNetif->next) {
123 if (tmpNetif->next == netif) {
124 tmpNetif->next = netif->next;
128 if (tmpNetif == NULL)
129 return; /* we didn't find any netif today */
131 /* this netif is default? */
132 if (netif_default == netif)
133 /* reset default netif */
134 netif_default = NULL;
135 LWIP_DEBUGF( NETIF_DEBUG, ("netif_remove: removed netif\n") );
139 netif_find(char *name)
150 for(netif = netif_list; netif != NULL; netif = netif->next) {
151 if (num == netif->num &&
152 name[0] == netif->name[0] &&
153 name[1] == netif->name[1]) {
154 LWIP_DEBUGF(NETIF_DEBUG, ("netif_find: found %c%c\n", name[0], name[1]));
158 LWIP_DEBUGF(NETIF_DEBUG, ("netif_find: didn't find %c%c\n", name[0], name[1]));
163 netif_set_ipaddr(struct netif *netif, struct ip_addr *ipaddr)
165 /* TODO: Handling of obsolete pcbs */
166 /* See: http://mail.gnu.org/archive/html/lwip-users/2003-03/msg00118.html */
169 struct tcp_pcb_listen *lpcb;
171 /* address is actually being changed? */
172 if ((ip_addr_cmp(ipaddr, &(netif->ip_addr))) == 0)
174 /* extern struct tcp_pcb *tcp_active_pcbs; defined by tcp.h */
175 LWIP_DEBUGF(NETIF_DEBUG | 1, ("netif_set_ipaddr: netif address being changed\n"));
176 pcb = tcp_active_pcbs;
177 while (pcb != NULL) {
178 /* PCB bound to current local interface address? */
179 if (ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
180 /* this connection must be aborted */
181 struct tcp_pcb *next = pcb->next;
182 LWIP_DEBUGF(NETIF_DEBUG | 1, ("netif_set_ipaddr: aborting TCP pcb %p\n", (void *)pcb));
189 for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
190 /* PCB bound to current local interface address? */
191 if (ip_addr_cmp(&(lpcb->local_ip), &(netif->ip_addr))) {
192 /* The PCB is listening to the old ipaddr and
193 * is set to listen to the new one instead */
194 ip_addr_set(&(lpcb->local_ip), ipaddr);
199 ip_addr_set(&(netif->ip_addr), ipaddr);
200 #if 0 /* only allowed for Ethernet interfaces TODO: how can we check? */
201 /** For Ethernet network interfaces, we would like to send a
202 * "gratuitous ARP"; this is an ARP packet sent by a node in order
203 * to spontaneously cause other nodes to update an entry in their
204 * ARP cache. From RFC 3220 "IP Mobility Support for IPv4" section 4.6.
206 etharp_query(netif, ipaddr, NULL);
208 LWIP_DEBUGF(NETIF_DEBUG | DBG_TRACE | DBG_STATE | 3, ("netif: IP address of interface %c%c set to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
209 netif->name[0], netif->name[1],
210 ip4_addr1(&netif->ip_addr),
211 ip4_addr2(&netif->ip_addr),
212 ip4_addr3(&netif->ip_addr),
213 ip4_addr4(&netif->ip_addr)));
217 netif_set_gw(struct netif *netif, struct ip_addr *gw)
219 ip_addr_set(&(netif->gw), gw);
220 LWIP_DEBUGF(NETIF_DEBUG | DBG_TRACE | DBG_STATE | 3, ("netif: GW address of interface %c%c set to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
221 netif->name[0], netif->name[1],
222 ip4_addr1(&netif->gw),
223 ip4_addr2(&netif->gw),
224 ip4_addr3(&netif->gw),
225 ip4_addr4(&netif->gw)));
229 netif_set_netmask(struct netif *netif, struct ip_addr *netmask)
231 ip_addr_set(&(netif->netmask), netmask);
232 LWIP_DEBUGF(NETIF_DEBUG | DBG_TRACE | DBG_STATE | 3, ("netif: netmask of interface %c%c set to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
233 netif->name[0], netif->name[1],
234 ip4_addr1(&netif->netmask),
235 ip4_addr2(&netif->netmask),
236 ip4_addr3(&netif->netmask),
237 ip4_addr4(&netif->netmask)));
241 netif_set_default(struct netif *netif)
243 netif_default = netif;
244 LWIP_DEBUGF(NETIF_DEBUG, ("netif: setting default interface %c%c\n",
245 netif ? netif->name[0] : '\'', netif ? netif->name[1] : '\''));
249 * Bring an interface up, available for processing
252 * @note: Enabling DHCP on a down interface will make it come
253 * up once configured.
257 void netif_set_up(struct netif *netif)
259 netif->flags |= NETIF_FLAG_UP;
263 * Ask if an interface is up
265 u8_t netif_is_up(struct netif *netif)
267 return (netif->flags & NETIF_FLAG_UP)?1:0;
271 * Bring an interface down, disabling any traffic processing.
273 * @note: Enabling DHCP on a down interface will make it come
274 * up once configured.
278 void netif_set_down(struct netif *netif)
280 netif->flags &= ~NETIF_FLAG_UP;
286 netif_list = netif_default = NULL;