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