4 * lwIP network interface abstraction
8 * Copyright (c) 2001-2003 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,
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33 * This file is part of the lwIP TCP/IP stack.
35 * Author: Adam Dunkels <adam@sics.se>
43 #include "lwip/netif.h"
44 #include "lwip/ip_addr.h"
48 struct netif *netif_list = NULL;
49 struct netif *netif_default = NULL;
52 * Add a network interface to the list of lwIP netifs.
54 * @param ipaddr IP address for the new netif
55 * @param netmask network mask for the new netif
56 * @param gw default gateway IP address for the new netif
57 * @param state opaque data passed to the new netif
58 * @param init callback function that initializes the interface
59 * @param input callback function that...
61 * @return netif, or NULL if failed.
64 netif_add(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))
71 static int netifnum = 0;
73 /* allocate netif structure */
74 netif = mem_malloc(sizeof(struct netif));
77 LWIP_DEBUGF(NETIF_DEBUG, ("netif_add(): out of memory for netif\n"));
81 /* netif not under DHCP control by default */
84 /* remember netif specific state information data */
86 netif->num = netifnum++;
89 netif_set_addr(netif, ipaddr, netmask, gw);
91 /* call user specified initialization function for netif */
92 if (init(netif) != ERR_OK) {
97 /* add this netif to the list */
98 netif->next = netif_list;
100 LWIP_DEBUGF(NETIF_DEBUG, ("netif: added interface %c%c IP addr ",
101 netif->name[0], netif->name[1]));
102 ip_addr_debug_print(NETIF_DEBUG, ipaddr);
103 LWIP_DEBUGF(NETIF_DEBUG, (" netmask "));
104 ip_addr_debug_print(NETIF_DEBUG, netmask);
105 LWIP_DEBUGF(NETIF_DEBUG, (" gw "));
106 ip_addr_debug_print(NETIF_DEBUG, gw);
107 LWIP_DEBUGF(NETIF_DEBUG, ("\n"));
112 netif_set_addr(struct netif *netif,struct ip_addr *ipaddr, struct ip_addr *netmask,
115 netif_set_ipaddr(netif, ipaddr);
116 netif_set_netmask(netif, netmask);
117 netif_set_gw(netif, gw);
120 void netif_remove(struct netif * netif)
122 if ( netif == NULL ) return;
124 /* is it the first netif? */
125 if (netif_list == netif) {
126 netif_list = netif->next;
129 /* look for netif further down the list */
130 struct netif * tmpNetif;
131 for (tmpNetif = netif_list; tmpNetif != NULL; tmpNetif = tmpNetif->next) {
132 if (tmpNetif->next == netif) {
133 tmpNetif->next = netif->next;
137 if (tmpNetif == NULL)
138 return; /* we didn't find any netif today */
140 /* this netif is default? */
141 if (netif_default == netif)
142 /* reset default netif */
143 netif_default = NULL;
144 LWIP_DEBUGF( NETIF_DEBUG, ("netif_remove: removed netif\n") );
149 netif_find(char *name)
160 for(netif = netif_list; netif != NULL; netif = netif->next) {
161 if (num == netif->num &&
162 name[0] == netif->name[0] &&
163 name[1] == netif->name[1]) {
164 LWIP_DEBUGF(NETIF_DEBUG, ("netif_find: found %c%c\n", name[0], name[1]));
168 LWIP_DEBUGF(NETIF_DEBUG, ("netif_find: didn't find %c%c\n", name[0], name[1]));
173 netif_set_ipaddr(struct netif *netif, struct ip_addr *ipaddr)
175 /* TODO: Handling of obsolete pcbs */
176 /* See: http://mail.gnu.org/archive/html/lwip-users/2003-03/msg00118.html */
179 struct tcp_pcb_listen *lpcb;
181 /* address is actually being changed? */
182 if ((ip_addr_cmp(ipaddr, &(netif->ip_addr))) == 0)
184 extern struct tcp_pcb *tcp_active_pcbs;
185 LWIP_DEBUGF(NETIF_DEBUG | 1, ("netif_set_ipaddr: netif address being changed\n"));
186 pcb = tcp_active_pcbs;
187 while (pcb != NULL) {
188 /* PCB bound to current local interface address? */
189 if (ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
190 /* this connection must be aborted */
191 struct tcp_pcb *next = pcb->next;
192 LWIP_DEBUGF(NETIF_DEBUG | 1, ("netif_set_ipaddr: aborting TCP pcb %p\n", (void *)pcb));
199 for (lpcb = tcp_listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
200 /* PCB bound to current local interface address? */
201 if (ip_addr_cmp(&(lpcb->local_ip), &(netif->ip_addr))) {
202 /* The PCB is listening to the old ipaddr and
203 * is set to listen to the new one instead */
204 ip_addr_set(&(lpcb->local_ip), ipaddr);
209 ip_addr_set(&(netif->ip_addr), ipaddr);
210 LWIP_DEBUGF(NETIF_DEBUG | DBG_TRACE | DBG_STATE | 3, ("netif: IP address of interface %c%c set to %u.%u.%u.%u\n",
211 netif->name[0], netif->name[1],
212 (unsigned int)(ntohl(netif->ip_addr.addr) >> 24 & 0xff),
213 (unsigned int)(ntohl(netif->ip_addr.addr) >> 16 & 0xff),
214 (unsigned int)(ntohl(netif->ip_addr.addr) >> 8 & 0xff),
215 (unsigned int)(ntohl(netif->ip_addr.addr) & 0xff)));
219 netif_set_gw(struct netif *netif, struct ip_addr *gw)
221 ip_addr_set(&(netif->gw), gw);
222 LWIP_DEBUGF(NETIF_DEBUG | DBG_TRACE | DBG_STATE | 3, ("netif: GW address of interface %c%c set to %u.%u.%u.%u\n",
223 netif->name[0], netif->name[1],
224 (unsigned int)(ntohl(netif->gw.addr) >> 24 & 0xff),
225 (unsigned int)(ntohl(netif->gw.addr) >> 16 & 0xff),
226 (unsigned int)(ntohl(netif->gw.addr) >> 8 & 0xff),
227 (unsigned int)(ntohl(netif->gw.addr) & 0xff)));
231 netif_set_netmask(struct netif *netif, struct ip_addr *netmask)
233 ip_addr_set(&(netif->netmask), netmask);
234 LWIP_DEBUGF(NETIF_DEBUG | DBG_TRACE | DBG_STATE | 3, ("netif: netmask of interface %c%c set to %u.%u.%u.%u\n",
235 netif->name[0], netif->name[1],
236 (unsigned int)(ntohl(netif->netmask.addr) >> 24 & 0xff),
237 (unsigned int)(ntohl(netif->netmask.addr) >> 16 & 0xff),
238 (unsigned int)(ntohl(netif->netmask.addr) >> 8 & 0xff),
239 (unsigned int)(ntohl(netif->netmask.addr) & 0xff)));
243 netif_set_default(struct netif *netif)
245 netif_default = netif;
246 LWIP_DEBUGF(NETIF_DEBUG, ("netif: setting default interface %c%c\n",
247 netif ? netif->name[0] : '\'', netif ? netif->name[1] : '\''));
253 netif_list = netif_default = NULL;