FreeRTOS/Common/ethernet/lwIP_132/src/core/ipv6/icmp6.c

   1 /*
   2  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without modification,
   6  * are permitted provided that the following conditions are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright notice,
   9  *    this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright notice,
  11  *    this list of conditions and the following disclaimer in the documentation
  12  *    and/or other materials provided with the distribution.
  13  * 3. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
  17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
  19  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
  21  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  22  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  23  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  24  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
  25  * OF SUCH DAMAGE.
  26  *
  27  * This file is part of the lwIP TCP/IP stack.
  28  *
  29  * Author: Adam Dunkels <adam@sics.se>
  30  *
  31  */
  32
  33 /* Some ICMP messages should be passed to the transport protocols. This
  34    is not implemented. */
  35
  36 #include "lwip/opt.h"
  37
  38 #if LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
  39
  40 #include "lwip/icmp.h"
  41 #include "lwip/inet.h"
  42 #include "lwip/ip.h"
  43 #include "lwip/def.h"
  44 #include "lwip/stats.h"
  45
  46 void
  47 icmp_input(struct pbuf *p, struct netif *inp)
  48 {
  49   u8_t type;
  50   struct icmp_echo_hdr *iecho;
  51   struct ip_hdr *iphdr;
  52   struct ip_addr tmpaddr;
  53
  54   ICMP_STATS_INC(icmp.recv);
  55
  56   /* TODO: check length before accessing payload! */
  57
  58   type = ((u8_t *)p->payload)[0];
  59
  60   switch (type) {
  61   case ICMP6_ECHO:
  62     LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ping\n"));
  63
  64     if (p->tot_len < sizeof(struct icmp_echo_hdr)) {
  65       LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: bad ICMP echo received\n"));
  66
  67       pbuf_free(p);
  68       ICMP_STATS_INC(icmp.lenerr);
  69       return;
  70     }
  71     iecho = p->payload;
  72     iphdr = (struct ip_hdr *)((u8_t *)p->payload - IP_HLEN);
  73     if (inet_chksum_pbuf(p) != 0) {
  74       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)));
  75       ICMP_STATS_INC(icmp.chkerr);
  76     /*      return;*/
  77     }
  78     LWIP_DEBUGF(ICMP_DEBUG, ("icmp: p->len %"S16_F" p->tot_len %"S16_F"\n", p->len, p->tot_len));
  79     ip_addr_set(&tmpaddr, &(iphdr->src));
  80     ip_addr_set(&(iphdr->src), &(iphdr->dest));
  81     ip_addr_set(&(iphdr->dest), &tmpaddr);
  82     iecho->type = ICMP6_ER;
  83     /* adjust the checksum */
  84     if (iecho->chksum >= htons(0xffff - (ICMP6_ECHO << 8))) {
  85       iecho->chksum += htons(ICMP6_ECHO << 8) + 1;
  86     } else {
  87       iecho->chksum += htons(ICMP6_ECHO << 8);
  88     }
  89     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)));
  90     ICMP_STATS_INC(icmp.xmit);
  91
  92     /*    LWIP_DEBUGF("icmp: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len);*/
  93     ip_output_if (p, &(iphdr->src), IP_HDRINCL,
  94      iphdr->hoplim, IP_PROTO_ICMP, inp);
  95     break;
  96   default:
  97     LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ICMP type %"S16_F" not supported.\n", (s16_t)type));
  98     ICMP_STATS_INC(icmp.proterr);
  99     ICMP_STATS_INC(icmp.drop);
 100   }
 101
 102   pbuf_free(p);
 103 }
 104
 105 void
 106 icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t)
 107 {
 108   struct pbuf *q;
 109   struct ip_hdr *iphdr;
 110   struct icmp_dur_hdr *idur;
 111
 112   /* @todo: can this be PBUF_LINK instead of PBUF_IP? */
 113   q = pbuf_alloc(PBUF_IP, 8 + IP_HLEN + 8, PBUF_RAM);
 114   /* ICMP header + IP header + 8 bytes of data */
 115   if (q == NULL) {
 116     LWIP_DEBUGF(ICMP_DEBUG, ("icmp_dest_unreach: failed to allocate pbuf for ICMP packet.\n"));
 117     pbuf_free(p);
 118     return;
 119   }
 120   LWIP_ASSERT("check that first pbuf can hold icmp message",
 121              (q->len >= (8 + IP_HLEN + 8)));
 122
 123   iphdr = p->payload;
 124
 125   idur = q->payload;
 126   idur->type = (u8_t)ICMP6_DUR;
 127   idur->icode = (u8_t)t;
 128
 129   SMEMCPY((u8_t *)q->payload + 8, p->payload, IP_HLEN + 8);
 130
 131   /* calculate checksum */
 132   idur->chksum = 0;
 133   idur->chksum = inet_chksum(idur, q->len);
 134   ICMP_STATS_INC(icmp.xmit);
 135
 136   ip_output(q, NULL,
 137       (struct ip_addr *)&(iphdr->src), ICMP_TTL, IP_PROTO_ICMP);
 138   pbuf_free(q);
 139 }
 140
 141 void
 142 icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t)
 143 {
 144   struct pbuf *q;
 145   struct ip_hdr *iphdr;
 146   struct icmp_te_hdr *tehdr;
 147
 148   LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded\n"));
 149
 150   /* @todo: can this be PBUF_LINK instead of PBUF_IP? */
 151   q = pbuf_alloc(PBUF_IP, 8 + IP_HLEN + 8, PBUF_RAM);
 152   /* ICMP header + IP header + 8 bytes of data */
 153   if (q == NULL) {
 154     LWIP_DEBUGF(ICMP_DEBUG, ("icmp_dest_unreach: failed to allocate pbuf for ICMP packet.\n"));
 155     pbuf_free(p);
 156     return;
 157   }
 158   LWIP_ASSERT("check that first pbuf can hold icmp message",
 159              (q->len >= (8 + IP_HLEN + 8)));
 160
 161   iphdr = p->payload;
 162
 163   tehdr = q->payload;
 164   tehdr->type = (u8_t)ICMP6_TE;
 165   tehdr->icode = (u8_t)t;
 166
 167   /* copy fields from original packet */
 168   SMEMCPY((u8_t *)q->payload + 8, (u8_t *)p->payload, IP_HLEN + 8);
 169
 170   /* calculate checksum */
 171   tehdr->chksum = 0;
 172   tehdr->chksum = inet_chksum(tehdr, q->len);
 173   ICMP_STATS_INC(icmp.xmit);
 174   ip_output(q, NULL,
 175       (struct ip_addr *)&(iphdr->src), ICMP_TTL, IP_PROTO_ICMP);
 176   pbuf_free(q);
 177 }
 178
 179 #endif /* LWIP_ICMP */