326 lines
9.7 KiB
C
326 lines
9.7 KiB
C
/**
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* @file
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*
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* lwIP network interface abstraction
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*/
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/*
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* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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#include "lwip/opt.h"
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#include "lwip/def.h"
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#include "lwip/ip_addr.h"
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#include "lwip/netif.h"
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#include "lwip/tcp.h"
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#include "lwip/snmp.h"
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struct netif *netif_list = NULL;
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struct netif *netif_default = NULL;
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/**
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* Add a network interface to the list of lwIP netifs.
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*
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* @param netif a pre-allocated netif structure
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* @param ipaddr IP address for the new netif
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* @param netmask network mask for the new netif
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* @param gw default gateway IP address for the new netif
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* @param state opaque data passed to the new netif
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* @param init callback function that initializes the interface
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* @param input callback function that is called to pass
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* ingress packets up in the protocol layer stack.
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*
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* @return netif, or NULL if failed.
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*/
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struct netif *
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netif_add(struct netif *netif, struct ip_addr *ipaddr, struct ip_addr *netmask,
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struct ip_addr *gw,
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void *state,
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err_t (* init)(struct netif *netif),
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err_t (* input)(struct pbuf *p, struct netif *netif))
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{
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static s16_t netifnum = 0;
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/* reset new interface configuration state */
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netif->ip_addr.addr = 0;
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netif->netmask.addr = 0;
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netif->gw.addr = 0;
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netif->flags = 0;
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#if LWIP_DHCP
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/* netif not under DHCP control by default */
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netif->dhcp = NULL;
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#endif
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/* remember netif specific state information data */
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netif->state = state;
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netif->num = netifnum++;
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netif->input = input;
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netif_set_addr(netif, ipaddr, netmask, gw);
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/* call user specified initialization function for netif */
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if (init(netif) != ERR_OK) {
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return NULL;
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}
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/* add this netif to the list */
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netif->next = netif_list;
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netif_list = netif;
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snmp_inc_iflist();
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LWIP_DEBUGF(NETIF_DEBUG, ("netif: added interface %c%c IP addr ",
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netif->name[0], netif->name[1]));
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ip_addr_debug_print(NETIF_DEBUG, ipaddr);
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LWIP_DEBUGF(NETIF_DEBUG, (" netmask "));
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ip_addr_debug_print(NETIF_DEBUG, netmask);
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LWIP_DEBUGF(NETIF_DEBUG, (" gw "));
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ip_addr_debug_print(NETIF_DEBUG, gw);
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LWIP_DEBUGF(NETIF_DEBUG, ("\n"));
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return netif;
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}
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void
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netif_set_addr(struct netif *netif,struct ip_addr *ipaddr, struct ip_addr *netmask,
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struct ip_addr *gw)
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{
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netif_set_ipaddr(netif, ipaddr);
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netif_set_netmask(netif, netmask);
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netif_set_gw(netif, gw);
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}
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void netif_remove(struct netif * netif)
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{
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if ( netif == NULL ) return;
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snmp_delete_ipaddridx_tree(netif);
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/* is it the first netif? */
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if (netif_list == netif) {
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netif_list = netif->next;
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snmp_dec_iflist();
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}
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else {
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/* look for netif further down the list */
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struct netif * tmpNetif;
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for (tmpNetif = netif_list; tmpNetif != NULL; tmpNetif = tmpNetif->next) {
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if (tmpNetif->next == netif) {
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tmpNetif->next = netif->next;
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snmp_dec_iflist();
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break;
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}
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}
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if (tmpNetif == NULL)
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return; /* we didn't find any netif today */
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}
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/* this netif is default? */
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if (netif_default == netif)
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/* reset default netif */
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netif_default = NULL;
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LWIP_DEBUGF( NETIF_DEBUG, ("netif_remove: removed netif\n") );
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}
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struct netif *
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netif_find(char *name)
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{
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struct netif *netif;
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u8_t num;
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if (name == NULL) {
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return NULL;
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}
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num = name[2] - '0';
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for(netif = netif_list; netif != NULL; netif = netif->next) {
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if (num == netif->num &&
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name[0] == netif->name[0] &&
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name[1] == netif->name[1]) {
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LWIP_DEBUGF(NETIF_DEBUG, ("netif_find: found %c%c\n", name[0], name[1]));
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return netif;
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}
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}
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LWIP_DEBUGF(NETIF_DEBUG, ("netif_find: didn't find %c%c\n", name[0], name[1]));
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return NULL;
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}
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void
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netif_set_ipaddr(struct netif *netif, struct ip_addr *ipaddr)
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{
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/* TODO: Handling of obsolete pcbs */
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/* See: http://mail.gnu.org/archive/html/lwip-users/2003-03/msg00118.html */
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#if LWIP_TCP
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struct tcp_pcb *pcb;
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struct tcp_pcb_listen *lpcb;
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/* address is actually being changed? */
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if ((ip_addr_cmp(ipaddr, &(netif->ip_addr))) == 0)
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{
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/* extern struct tcp_pcb *tcp_active_pcbs; defined by tcp.h */
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LWIP_DEBUGF(NETIF_DEBUG | 1, ("netif_set_ipaddr: netif address being changed\n"));
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pcb = tcp_active_pcbs;
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while (pcb != NULL) {
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/* PCB bound to current local interface address? */
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if (ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
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/* this connection must be aborted */
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struct tcp_pcb *next = pcb->next;
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LWIP_DEBUGF(NETIF_DEBUG | 1, ("netif_set_ipaddr: aborting TCP pcb %p\n", (void *)pcb));
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tcp_abort(pcb);
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pcb = next;
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} else {
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pcb = pcb->next;
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}
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}
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for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
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/* PCB bound to current local interface address? */
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if (ip_addr_cmp(&(lpcb->local_ip), &(netif->ip_addr))) {
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/* The PCB is listening to the old ipaddr and
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* is set to listen to the new one instead */
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ip_addr_set(&(lpcb->local_ip), ipaddr);
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}
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}
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}
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#endif
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snmp_delete_ipaddridx_tree(netif);
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snmp_delete_iprteidx_tree(0,netif);
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/* set new IP address to netif */
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ip_addr_set(&(netif->ip_addr), ipaddr);
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snmp_insert_ipaddridx_tree(netif);
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snmp_insert_iprteidx_tree(0,netif);
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#if 0 /* only allowed for Ethernet interfaces TODO: how can we check? */
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/** For Ethernet network interfaces, we would like to send a
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* "gratuitous ARP"; this is an ARP packet sent by a node in order
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* to spontaneously cause other nodes to update an entry in their
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* ARP cache. From RFC 3220 "IP Mobility Support for IPv4" section 4.6.
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*/
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etharp_query(netif, ipaddr, NULL);
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#endif
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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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netif->name[0], netif->name[1],
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ip4_addr1(&netif->ip_addr),
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ip4_addr2(&netif->ip_addr),
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ip4_addr3(&netif->ip_addr),
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ip4_addr4(&netif->ip_addr)));
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}
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void
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netif_set_gw(struct netif *netif, struct ip_addr *gw)
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{
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ip_addr_set(&(netif->gw), gw);
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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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netif->name[0], netif->name[1],
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ip4_addr1(&netif->gw),
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ip4_addr2(&netif->gw),
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ip4_addr3(&netif->gw),
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ip4_addr4(&netif->gw)));
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}
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void
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netif_set_netmask(struct netif *netif, struct ip_addr *netmask)
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{
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snmp_delete_iprteidx_tree(0, netif);
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/* set new netmask to netif */
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ip_addr_set(&(netif->netmask), netmask);
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snmp_insert_iprteidx_tree(0, netif);
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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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netif->name[0], netif->name[1],
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ip4_addr1(&netif->netmask),
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ip4_addr2(&netif->netmask),
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ip4_addr3(&netif->netmask),
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ip4_addr4(&netif->netmask)));
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}
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void
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netif_set_default(struct netif *netif)
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{
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if (netif == NULL)
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{
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/* remove default route */
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snmp_delete_iprteidx_tree(1, netif);
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}
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else
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{
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/* install default route */
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snmp_insert_iprteidx_tree(1, netif);
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}
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netif_default = netif;
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LWIP_DEBUGF(NETIF_DEBUG, ("netif: setting default interface %c%c\n",
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netif ? netif->name[0] : '\'', netif ? netif->name[1] : '\''));
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}
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/**
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* Bring an interface up, available for processing
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* traffic.
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*
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* @note: Enabling DHCP on a down interface will make it come
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* up once configured.
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*
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* @see dhcp_start()
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*/
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void netif_set_up(struct netif *netif)
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{
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netif->flags |= NETIF_FLAG_UP;
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#if LWIP_SNMP
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snmp_get_sysuptime(&netif->ts);
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#endif
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}
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/**
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* Ask if an interface is up
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*/
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u8_t netif_is_up(struct netif *netif)
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{
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return (netif->flags & NETIF_FLAG_UP)?1:0;
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}
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/**
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* Bring an interface down, disabling any traffic processing.
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*
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* @note: Enabling DHCP on a down interface will make it come
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* up once configured.
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*
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* @see dhcp_start()
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*/
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void netif_set_down(struct netif *netif)
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{
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netif->flags &= ~NETIF_FLAG_UP;
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#if LWIP_SNMP
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snmp_get_sysuptime(&netif->ts);
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#endif
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}
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void
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netif_init(void)
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{
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netif_list = netif_default = NULL;
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}
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