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