4 * lwIP network interface abstraction
8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
11 * Redistribution and use in source and binary forms, with or without modification,
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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19 * 3. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
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,
26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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"
45 #include "lwip/snmp.h"
48 #include "netif/etharp.h"
52 struct netif *netif_list = NULL;
53 struct netif *netif_default = NULL;
56 * Add a network interface to the list of lwIP netifs.
58 * @param netif a pre-allocated netif structure
59 * @param ipaddr IP address for the new netif
60 * @param netmask network mask for the new netif
61 * @param gw default gateway IP address for the new netif
62 * @param state opaque data passed to the new netif
63 * @param init callback function that initializes the interface
64 * @param input callback function that is called to pass
65 * ingress packets up in the protocol layer stack.
67 * @return netif, or NULL if failed.
70 netif_add(struct netif *netif, struct ip_addr *ipaddr, struct ip_addr *netmask,
73 err_t (* init)(struct netif *netif),
74 err_t (* input)(struct pbuf *p, struct netif *netif))
76 static u8_t netifnum = 0;
78 /* reset new interface configuration state */
79 netif->ip_addr.addr = 0;
80 netif->netmask.addr = 0;
84 /* netif not under DHCP control by default */
87 #if LWIP_NETIF_CALLBACK
88 netif->status_callback = NULL;
89 #endif /* LWIP_NETIF_CALLBACK */
91 /* remember netif specific state information data */
93 netif->num = netifnum++;
96 netif_set_addr(netif, ipaddr, netmask, gw);
98 /* call user specified initialization function for netif */
99 if (init(netif) != ERR_OK) {
103 /* add this netif to the list */
104 netif->next = netif_list;
108 LWIP_DEBUGF(NETIF_DEBUG, ("netif: added interface %c%c IP addr ",
109 netif->name[0], netif->name[1]));
110 ip_addr_debug_print(NETIF_DEBUG, ipaddr);
111 LWIP_DEBUGF(NETIF_DEBUG, (" netmask "));
112 ip_addr_debug_print(NETIF_DEBUG, netmask);
113 LWIP_DEBUGF(NETIF_DEBUG, (" gw "));
114 ip_addr_debug_print(NETIF_DEBUG, gw);
115 LWIP_DEBUGF(NETIF_DEBUG, ("\n"));
120 netif_set_addr(struct netif *netif,struct ip_addr *ipaddr, struct ip_addr *netmask,
123 netif_set_ipaddr(netif, ipaddr);
124 netif_set_netmask(netif, netmask);
125 netif_set_gw(netif, gw);
128 void netif_remove(struct netif * netif)
130 if ( netif == NULL ) return;
132 snmp_delete_ipaddridx_tree(netif);
134 /* is it the first netif? */
135 if (netif_list == netif) {
136 netif_list = netif->next;
140 /* look for netif further down the list */
141 struct netif * tmpNetif;
142 for (tmpNetif = netif_list; tmpNetif != NULL; tmpNetif = tmpNetif->next) {
143 if (tmpNetif->next == netif) {
144 tmpNetif->next = netif->next;
149 if (tmpNetif == NULL)
150 return; /* we didn't find any netif today */
152 /* this netif is default? */
153 if (netif_default == netif)
154 /* reset default netif */
155 netif_default = NULL;
156 LWIP_DEBUGF( NETIF_DEBUG, ("netif_remove: removed netif\n") );
160 netif_find(char *name)
171 for(netif = netif_list; netif != NULL; netif = netif->next) {
172 if (num == netif->num &&
173 name[0] == netif->name[0] &&
174 name[1] == netif->name[1]) {
175 LWIP_DEBUGF(NETIF_DEBUG, ("netif_find: found %c%c\n", name[0], name[1]));
179 LWIP_DEBUGF(NETIF_DEBUG, ("netif_find: didn't find %c%c\n", name[0], name[1]));
184 netif_set_ipaddr(struct netif *netif, struct ip_addr *ipaddr)
186 /* TODO: Handling of obsolete pcbs */
187 /* See: http://mail.gnu.org/archive/html/lwip-users/2003-03/msg00118.html */
190 struct tcp_pcb_listen *lpcb;
192 /* address is actually being changed? */
193 if ((ip_addr_cmp(ipaddr, &(netif->ip_addr))) == 0)
195 /* extern struct tcp_pcb *tcp_active_pcbs; defined by tcp.h */
196 LWIP_DEBUGF(NETIF_DEBUG | 1, ("netif_set_ipaddr: netif address being changed\n"));
197 pcb = tcp_active_pcbs;
198 while (pcb != NULL) {
199 /* PCB bound to current local interface address? */
200 if (ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
201 /* this connection must be aborted */
202 struct tcp_pcb *next = pcb->next;
203 LWIP_DEBUGF(NETIF_DEBUG | 1, ("netif_set_ipaddr: aborting TCP pcb %p\n", (void *)pcb));
210 for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
211 /* PCB bound to current local interface address? */
212 if (ip_addr_cmp(&(lpcb->local_ip), &(netif->ip_addr))) {
213 /* The PCB is listening to the old ipaddr and
214 * is set to listen to the new one instead */
215 ip_addr_set(&(lpcb->local_ip), ipaddr);
220 snmp_delete_ipaddridx_tree(netif);
221 snmp_delete_iprteidx_tree(0,netif);
222 /* set new IP address to netif */
223 ip_addr_set(&(netif->ip_addr), ipaddr);
224 snmp_insert_ipaddridx_tree(netif);
225 snmp_insert_iprteidx_tree(0,netif);
227 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",
228 netif->name[0], netif->name[1],
229 ip4_addr1(&netif->ip_addr),
230 ip4_addr2(&netif->ip_addr),
231 ip4_addr3(&netif->ip_addr),
232 ip4_addr4(&netif->ip_addr)));
236 netif_set_gw(struct netif *netif, struct ip_addr *gw)
238 ip_addr_set(&(netif->gw), gw);
239 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",
240 netif->name[0], netif->name[1],
241 ip4_addr1(&netif->gw),
242 ip4_addr2(&netif->gw),
243 ip4_addr3(&netif->gw),
244 ip4_addr4(&netif->gw)));
248 netif_set_netmask(struct netif *netif, struct ip_addr *netmask)
250 snmp_delete_iprteidx_tree(0, netif);
251 /* set new netmask to netif */
252 ip_addr_set(&(netif->netmask), netmask);
253 snmp_insert_iprteidx_tree(0, netif);
254 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",
255 netif->name[0], netif->name[1],
256 ip4_addr1(&netif->netmask),
257 ip4_addr2(&netif->netmask),
258 ip4_addr3(&netif->netmask),
259 ip4_addr4(&netif->netmask)));
263 netif_set_default(struct netif *netif)
267 /* remove default route */
268 snmp_delete_iprteidx_tree(1, netif);
272 /* install default route */
273 snmp_insert_iprteidx_tree(1, netif);
275 netif_default = netif;
276 LWIP_DEBUGF(NETIF_DEBUG, ("netif: setting default interface %c%c\n",
277 netif ? netif->name[0] : '\'', netif ? netif->name[1] : '\''));
281 * Bring an interface up, available for processing
284 * @note: Enabling DHCP on a down interface will make it come
285 * up once configured.
289 void netif_set_up(struct netif *netif)
291 if ( !(netif->flags & NETIF_FLAG_UP )) {
292 netif->flags |= NETIF_FLAG_UP;
295 snmp_get_sysuptime(&netif->ts);
296 #endif /* LWIP_SNMP */
298 #if LWIP_NETIF_CALLBACK
299 if ( netif->status_callback )
300 (netif->status_callback)( netif );
301 #endif /* LWIP_NETIF_CALLBACK */
304 /** For Ethernet network interfaces, we would like to send a
305 * "gratuitous ARP"; this is an ARP packet sent by a node in order
306 * to spontaneously cause other nodes to update an entry in their
307 * ARP cache. From RFC 3220 "IP Mobility Support for IPv4" section 4.6.
309 if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
310 etharp_query(netif, &(netif->ip_addr), NULL);
312 #endif /* LWIP_ARP */
318 * Ask if an interface is up
320 u8_t netif_is_up(struct netif *netif)
322 return (netif->flags & NETIF_FLAG_UP)?1:0;
326 * Bring an interface down, disabling any traffic processing.
328 * @note: Enabling DHCP on a down interface will make it come
329 * up once configured.
333 void netif_set_down(struct netif *netif)
335 if ( netif->flags & NETIF_FLAG_UP )
337 netif->flags &= ~NETIF_FLAG_UP;
339 snmp_get_sysuptime(&netif->ts);
342 #if LWIP_NETIF_CALLBACK
343 if ( netif->status_callback )
344 (netif->status_callback)( netif );
345 #endif /* LWIP_NETIF_CALLBACK */
352 netif_list = netif_default = NULL;
356 #if LWIP_NETIF_CALLBACK
358 * Set callback to be called when interface is brought up/down
360 void netif_set_status_callback( struct netif *netif, void (* status_callback)(struct netif *netif ))
363 netif->status_callback = status_callback;
365 #endif /* LWIP_NETIF_CALLBACK */