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/**

 * @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"

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;

#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;

  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;

  /*  is it the first netif? */

  if (netif_list == netif) {

    netif_list = netif->next;

  }

  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;

        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

  ip_addr_set(&(netif->ip_addr), ipaddr);

#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)

{

  ip_addr_set(&(netif->netmask), netmask);

  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)

{

  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;

}

/**

 * 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;

}

void

netif_init(void)

{

  netif_list = netif_default = NULL;

}