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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [ethernet/] [lwIP_132/] [src/] [core/] [ipv6/] [icmp6.c] - Blame information for rev 606

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Line No. Rev Author Line
1 606 jeremybenn
/*
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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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/* Some ICMP messages should be passed to the transport protocols. This
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   is not implemented. */
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#include "lwip/opt.h"
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#if LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
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#include "lwip/icmp.h"
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#include "lwip/inet.h"
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#include "lwip/ip.h"
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#include "lwip/def.h"
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#include "lwip/stats.h"
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void
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icmp_input(struct pbuf *p, struct netif *inp)
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{
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  u8_t type;
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  struct icmp_echo_hdr *iecho;
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  struct ip_hdr *iphdr;
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  struct ip_addr tmpaddr;
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  ICMP_STATS_INC(icmp.recv);
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  /* TODO: check length before accessing payload! */
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  type = ((u8_t *)p->payload)[0];
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  switch (type) {
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  case ICMP6_ECHO:
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    LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ping\n"));
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    if (p->tot_len < sizeof(struct icmp_echo_hdr)) {
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      LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: bad ICMP echo received\n"));
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      pbuf_free(p);
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      ICMP_STATS_INC(icmp.lenerr);
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      return;
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    }
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    iecho = p->payload;
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    iphdr = (struct ip_hdr *)((u8_t *)p->payload - IP_HLEN);
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    if (inet_chksum_pbuf(p) != 0) {
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      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)));
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      ICMP_STATS_INC(icmp.chkerr);
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    /*      return;*/
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    }
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    LWIP_DEBUGF(ICMP_DEBUG, ("icmp: p->len %"S16_F" p->tot_len %"S16_F"\n", p->len, p->tot_len));
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    ip_addr_set(&tmpaddr, &(iphdr->src));
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    ip_addr_set(&(iphdr->src), &(iphdr->dest));
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    ip_addr_set(&(iphdr->dest), &tmpaddr);
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    iecho->type = ICMP6_ER;
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    /* adjust the checksum */
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    if (iecho->chksum >= htons(0xffff - (ICMP6_ECHO << 8))) {
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      iecho->chksum += htons(ICMP6_ECHO << 8) + 1;
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    } else {
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      iecho->chksum += htons(ICMP6_ECHO << 8);
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    }
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    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)));
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    ICMP_STATS_INC(icmp.xmit);
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    /*    LWIP_DEBUGF("icmp: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len);*/
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    ip_output_if (p, &(iphdr->src), IP_HDRINCL,
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     iphdr->hoplim, IP_PROTO_ICMP, inp);
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    break;
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  default:
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    LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ICMP type %"S16_F" not supported.\n", (s16_t)type));
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    ICMP_STATS_INC(icmp.proterr);
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    ICMP_STATS_INC(icmp.drop);
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  }
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  pbuf_free(p);
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}
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void
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icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t)
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{
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  struct pbuf *q;
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  struct ip_hdr *iphdr;
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  struct icmp_dur_hdr *idur;
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  /* @todo: can this be PBUF_LINK instead of PBUF_IP? */
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  q = pbuf_alloc(PBUF_IP, 8 + IP_HLEN + 8, PBUF_RAM);
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  /* ICMP header + IP header + 8 bytes of data */
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  if (q == NULL) {
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    LWIP_DEBUGF(ICMP_DEBUG, ("icmp_dest_unreach: failed to allocate pbuf for ICMP packet.\n"));
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    pbuf_free(p);
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    return;
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  }
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  LWIP_ASSERT("check that first pbuf can hold icmp message",
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             (q->len >= (8 + IP_HLEN + 8)));
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  iphdr = p->payload;
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  idur = q->payload;
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  idur->type = (u8_t)ICMP6_DUR;
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  idur->icode = (u8_t)t;
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  SMEMCPY((u8_t *)q->payload + 8, p->payload, IP_HLEN + 8);
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  /* calculate checksum */
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  idur->chksum = 0;
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  idur->chksum = inet_chksum(idur, q->len);
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  ICMP_STATS_INC(icmp.xmit);
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  ip_output(q, NULL,
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      (struct ip_addr *)&(iphdr->src), ICMP_TTL, IP_PROTO_ICMP);
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  pbuf_free(q);
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}
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void
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icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t)
143
{
144
  struct pbuf *q;
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  struct ip_hdr *iphdr;
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  struct icmp_te_hdr *tehdr;
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  LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded\n"));
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  /* @todo: can this be PBUF_LINK instead of PBUF_IP? */
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  q = pbuf_alloc(PBUF_IP, 8 + IP_HLEN + 8, PBUF_RAM);
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  /* ICMP header + IP header + 8 bytes of data */
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  if (q == NULL) {
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    LWIP_DEBUGF(ICMP_DEBUG, ("icmp_dest_unreach: failed to allocate pbuf for ICMP packet.\n"));
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    pbuf_free(p);
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    return;
157
  }
158
  LWIP_ASSERT("check that first pbuf can hold icmp message",
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             (q->len >= (8 + IP_HLEN + 8)));
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  iphdr = p->payload;
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  tehdr = q->payload;
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  tehdr->type = (u8_t)ICMP6_TE;
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  tehdr->icode = (u8_t)t;
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  /* copy fields from original packet */
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  SMEMCPY((u8_t *)q->payload + 8, (u8_t *)p->payload, IP_HLEN + 8);
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  /* calculate checksum */
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  tehdr->chksum = 0;
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  tehdr->chksum = inet_chksum(tehdr, q->len);
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  ICMP_STATS_INC(icmp.xmit);
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  ip_output(q, NULL,
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      (struct ip_addr *)&(iphdr->src), ICMP_TTL, IP_PROTO_ICMP);
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  pbuf_free(q);
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}
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#endif /* LWIP_ICMP */

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