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/*

 * 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>

 *

 */

/* Some ICMP messages should be passed to the transport protocols. This

   is not implemented. */

#include "lwip/opt.h"

#include "lwip/icmp.h"

#include "lwip/inet.h"

#include "lwip/ip.h"

#include "lwip/def.h"

#include "lwip/stats.h"

void

icmp_input(struct pbuf *p, struct netif *inp)

{

  u8_t type;

  struct icmp_echo_hdr *iecho;

  struct ip_hdr *iphdr;

  struct ip_addr tmpaddr;

#ifdef ICMP_STATS

  ++lwip_stats.icmp.recv;

#endif /* ICMP_STATS */

  /* TODO: check length before accessing payload! */

  type = ((u8_t *)p->payload)[0];

  switch (type) {

  case ICMP6_ECHO:

    LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ping\n"));

    if (p->tot_len < sizeof(struct icmp_echo_hdr)) {

      LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: bad ICMP echo received\n"));

      pbuf_free(p);

#ifdef ICMP_STATS

      ++lwip_stats.icmp.lenerr;

#endif /* ICMP_STATS */

      return;

    }

    iecho = p->payload;

    iphdr = (struct ip_hdr *)((u8_t *)p->payload - IP_HLEN);

    if (inet_chksum_pbuf(p) != 0) {

      LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: checksum failed for received ICMP echo (%"X16_F")\n", inet_chksum_pseudo(p, &(iphdr->src), &(iphdr->dest), IP_PROTO_ICMP, p->tot_len)));

#ifdef ICMP_STATS

      ++lwip_stats.icmp.chkerr;

#endif /* ICMP_STATS */

    /*      return;*/

    }

    LWIP_DEBUGF(ICMP_DEBUG, ("icmp: p->len %"S16_F" p->tot_len %"S16_F"\n", p->len, p->tot_len));

    ip_addr_set(&tmpaddr, &(iphdr->src));

    ip_addr_set(&(iphdr->src), &(iphdr->dest));

    ip_addr_set(&(iphdr->dest), &tmpaddr);

    iecho->type = ICMP6_ER;

    /* adjust the checksum */

    if (iecho->chksum >= htons(0xffff - (ICMP6_ECHO << 8))) {

      iecho->chksum += htons(ICMP6_ECHO << 8) + 1;

    } else {

      iecho->chksum += htons(ICMP6_ECHO << 8);

    }

    LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: checksum failed for received ICMP echo (%"X16_F")\n", inet_chksum_pseudo(p, &(iphdr->src), &(iphdr->dest), IP_PROTO_ICMP, p->tot_len)));

#ifdef ICMP_STATS

    ++lwip_stats.icmp.xmit;

#endif /* ICMP_STATS */

    /*    LWIP_DEBUGF("icmp: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len);*/

    ip_output_if (p, &(iphdr->src), IP_HDRINCL,

     iphdr->hoplim, IP_PROTO_ICMP, inp);

    break;

  default:

    LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ICMP type %"S16_F" not supported.\n", (s16_t)type));

#ifdef ICMP_STATS

    ++lwip_stats.icmp.proterr;

    ++lwip_stats.icmp.drop;

#endif /* ICMP_STATS */

  }

  pbuf_free(p);

}

void

icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t)

{

  struct pbuf *q;

  struct ip_hdr *iphdr;

  struct icmp_dur_hdr *idur;

  q = pbuf_alloc(PBUF_IP, 8 + IP_HLEN + 8, PBUF_RAM);

  /* ICMP header + IP header + 8 bytes of data */

  iphdr = p->payload;

  idur = q->payload;

  idur->type = (u8_t)ICMP6_DUR;

  idur->icode = (u8_t)t;

  memcpy((u8_t *)q->payload + 8, p->payload, IP_HLEN + 8);

  /* calculate checksum */

  idur->chksum = 0;

  idur->chksum = inet_chksum(idur, q->len);

#ifdef ICMP_STATS

  ++lwip_stats.icmp.xmit;

#endif /* ICMP_STATS */

  ip_output(q, NULL,

      (struct ip_addr *)&(iphdr->src), ICMP_TTL, IP_PROTO_ICMP);

  pbuf_free(q);

}

void

icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t)

{

  struct pbuf *q;

  struct ip_hdr *iphdr;

  struct icmp_te_hdr *tehdr;

  LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded\n"));

  q = pbuf_alloc(PBUF_IP, 8 + IP_HLEN + 8, PBUF_RAM);

  iphdr = p->payload;

  tehdr = q->payload;

  tehdr->type = (u8_t)ICMP6_TE;

  tehdr->icode = (u8_t)t;

  /* copy fields from original packet */

  memcpy((u8_t *)q->payload + 8, (u8_t *)p->payload, IP_HLEN + 8);

  /* calculate checksum */

  tehdr->chksum = 0;

  tehdr->chksum = inet_chksum(tehdr, q->len);

#ifdef ICMP_STATS

  ++lwip_stats.icmp.xmit;

#endif /* ICMP_STATS */

  ip_output(q, NULL,

      (struct ip_addr *)&(iphdr->src), ICMP_TTL, IP_PROTO_ICMP);

  pbuf_free(q);

}