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Dependents:   EthernetInterface

Fork of lwip by mbed official

core/ipv6/icmp6.c@0:51ac1d130fd4, 2012-06-22 (annotated)

Committer:
mbed_official
Date:
Fri Jun 22 09:25:39 2012 +0000
Revision:
0:51ac1d130fd4
Initial import from lwip-1.4.0: http://download.savannah.gnu.org/releases/lwip/lwip-1.4.0.zip

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:51ac1d130fd4 1 /*
mbed_official 0:51ac1d130fd4 2 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
mbed_official 0:51ac1d130fd4 3 * All rights reserved.
mbed_official 0:51ac1d130fd4 4 *
mbed_official 0:51ac1d130fd4 5 * Redistribution and use in source and binary forms, with or without modification,
mbed_official 0:51ac1d130fd4 6 * are permitted provided that the following conditions are met:
mbed_official 0:51ac1d130fd4 7 *
mbed_official 0:51ac1d130fd4 8 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 0:51ac1d130fd4 9 * this list of conditions and the following disclaimer.
mbed_official 0:51ac1d130fd4 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 0:51ac1d130fd4 11 * this list of conditions and the following disclaimer in the documentation
mbed_official 0:51ac1d130fd4 12 * and/or other materials provided with the distribution.
mbed_official 0:51ac1d130fd4 13 * 3. The name of the author may not be used to endorse or promote products
mbed_official 0:51ac1d130fd4 14 * derived from this software without specific prior written permission.
mbed_official 0:51ac1d130fd4 15 *
mbed_official 0:51ac1d130fd4 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
mbed_official 0:51ac1d130fd4 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
mbed_official 0:51ac1d130fd4 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
mbed_official 0:51ac1d130fd4 19 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
mbed_official 0:51ac1d130fd4 20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
mbed_official 0:51ac1d130fd4 21 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mbed_official 0:51ac1d130fd4 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mbed_official 0:51ac1d130fd4 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
mbed_official 0:51ac1d130fd4 24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
mbed_official 0:51ac1d130fd4 25 * OF SUCH DAMAGE.
mbed_official 0:51ac1d130fd4 26 *
mbed_official 0:51ac1d130fd4 27 * This file is part of the lwIP TCP/IP stack.
mbed_official 0:51ac1d130fd4 28 *
mbed_official 0:51ac1d130fd4 29 * Author: Adam Dunkels <adam@sics.se>
mbed_official 0:51ac1d130fd4 30 *
mbed_official 0:51ac1d130fd4 31 */
mbed_official 0:51ac1d130fd4 32
mbed_official 0:51ac1d130fd4 33 /* Some ICMP messages should be passed to the transport protocols. This
mbed_official 0:51ac1d130fd4 34 is not implemented. */
mbed_official 0:51ac1d130fd4 35
mbed_official 0:51ac1d130fd4 36 #include "lwip/opt.h"
mbed_official 0:51ac1d130fd4 37
mbed_official 0:51ac1d130fd4 38 #if LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
mbed_official 0:51ac1d130fd4 39
mbed_official 0:51ac1d130fd4 40 #include "lwip/icmp.h"
mbed_official 0:51ac1d130fd4 41 #include "lwip/inet.h"
mbed_official 0:51ac1d130fd4 42 #include "lwip/ip.h"
mbed_official 0:51ac1d130fd4 43 #include "lwip/def.h"
mbed_official 0:51ac1d130fd4 44 #include "lwip/stats.h"
mbed_official 0:51ac1d130fd4 45
mbed_official 0:51ac1d130fd4 46 void
mbed_official 0:51ac1d130fd4 47 icmp_input(struct pbuf *p, struct netif *inp)
mbed_official 0:51ac1d130fd4 48 {
mbed_official 0:51ac1d130fd4 49 u8_t type;
mbed_official 0:51ac1d130fd4 50 struct icmp_echo_hdr *iecho;
mbed_official 0:51ac1d130fd4 51 struct ip_hdr *iphdr;
mbed_official 0:51ac1d130fd4 52 struct ip_addr tmpaddr;
mbed_official 0:51ac1d130fd4 53
mbed_official 0:51ac1d130fd4 54 ICMP_STATS_INC(icmp.recv);
mbed_official 0:51ac1d130fd4 55
mbed_official 0:51ac1d130fd4 56 /* TODO: check length before accessing payload! */
mbed_official 0:51ac1d130fd4 57
mbed_official 0:51ac1d130fd4 58 type = ((u8_t *)p->payload)[0];
mbed_official 0:51ac1d130fd4 59
mbed_official 0:51ac1d130fd4 60 switch (type) {
mbed_official 0:51ac1d130fd4 61 case ICMP6_ECHO:
mbed_official 0:51ac1d130fd4 62 LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ping\n"));
mbed_official 0:51ac1d130fd4 63
mbed_official 0:51ac1d130fd4 64 if (p->tot_len < sizeof(struct icmp_echo_hdr)) {
mbed_official 0:51ac1d130fd4 65 LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: bad ICMP echo received\n"));
mbed_official 0:51ac1d130fd4 66
mbed_official 0:51ac1d130fd4 67 pbuf_free(p);
mbed_official 0:51ac1d130fd4 68 ICMP_STATS_INC(icmp.lenerr);
mbed_official 0:51ac1d130fd4 69 return;
mbed_official 0:51ac1d130fd4 70 }
mbed_official 0:51ac1d130fd4 71 iecho = p->payload;
mbed_official 0:51ac1d130fd4 72 iphdr = (struct ip_hdr *)((u8_t *)p->payload - IP_HLEN);
mbed_official 0:51ac1d130fd4 73 if (inet_chksum_pbuf(p) != 0) {
mbed_official 0:51ac1d130fd4 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)));
mbed_official 0:51ac1d130fd4 75 ICMP_STATS_INC(icmp.chkerr);
mbed_official 0:51ac1d130fd4 76 /* return;*/
mbed_official 0:51ac1d130fd4 77 }
mbed_official 0:51ac1d130fd4 78 LWIP_DEBUGF(ICMP_DEBUG, ("icmp: p->len %"S16_F" p->tot_len %"S16_F"\n", p->len, p->tot_len));
mbed_official 0:51ac1d130fd4 79 ip_addr_set(&tmpaddr, &(iphdr->src));
mbed_official 0:51ac1d130fd4 80 ip_addr_set(&(iphdr->src), &(iphdr->dest));
mbed_official 0:51ac1d130fd4 81 ip_addr_set(&(iphdr->dest), &tmpaddr);
mbed_official 0:51ac1d130fd4 82 iecho->type = ICMP6_ER;
mbed_official 0:51ac1d130fd4 83 /* adjust the checksum */
mbed_official 0:51ac1d130fd4 84 if (iecho->chksum >= htons(0xffff - (ICMP6_ECHO << 8))) {
mbed_official 0:51ac1d130fd4 85 iecho->chksum += htons(ICMP6_ECHO << 8) + 1;
mbed_official 0:51ac1d130fd4 86 } else {
mbed_official 0:51ac1d130fd4 87 iecho->chksum += htons(ICMP6_ECHO << 8);
mbed_official 0:51ac1d130fd4 88 }
mbed_official 0:51ac1d130fd4 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)));
mbed_official 0:51ac1d130fd4 90 ICMP_STATS_INC(icmp.xmit);
mbed_official 0:51ac1d130fd4 91
mbed_official 0:51ac1d130fd4 92 /* LWIP_DEBUGF("icmp: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len);*/
mbed_official 0:51ac1d130fd4 93 ip_output_if (p, &(iphdr->src), IP_HDRINCL,
mbed_official 0:51ac1d130fd4 94 iphdr->hoplim, IP_PROTO_ICMP, inp);
mbed_official 0:51ac1d130fd4 95 break;
mbed_official 0:51ac1d130fd4 96 default:
mbed_official 0:51ac1d130fd4 97 LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ICMP type %"S16_F" not supported.\n", (s16_t)type));
mbed_official 0:51ac1d130fd4 98 ICMP_STATS_INC(icmp.proterr);
mbed_official 0:51ac1d130fd4 99 ICMP_STATS_INC(icmp.drop);
mbed_official 0:51ac1d130fd4 100 }
mbed_official 0:51ac1d130fd4 101
mbed_official 0:51ac1d130fd4 102 pbuf_free(p);
mbed_official 0:51ac1d130fd4 103 }
mbed_official 0:51ac1d130fd4 104
mbed_official 0:51ac1d130fd4 105 void
mbed_official 0:51ac1d130fd4 106 icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t)
mbed_official 0:51ac1d130fd4 107 {
mbed_official 0:51ac1d130fd4 108 struct pbuf *q;
mbed_official 0:51ac1d130fd4 109 struct ip_hdr *iphdr;
mbed_official 0:51ac1d130fd4 110 struct icmp_dur_hdr *idur;
mbed_official 0:51ac1d130fd4 111
mbed_official 0:51ac1d130fd4 112 /* @todo: can this be PBUF_LINK instead of PBUF_IP? */
mbed_official 0:51ac1d130fd4 113 q = pbuf_alloc(PBUF_IP, 8 + IP_HLEN + 8, PBUF_RAM);
mbed_official 0:51ac1d130fd4 114 /* ICMP header + IP header + 8 bytes of data */
mbed_official 0:51ac1d130fd4 115 if (q == NULL) {
mbed_official 0:51ac1d130fd4 116 LWIP_DEBUGF(ICMP_DEBUG, ("icmp_dest_unreach: failed to allocate pbuf for ICMP packet.\n"));
mbed_official 0:51ac1d130fd4 117 pbuf_free(p);
mbed_official 0:51ac1d130fd4 118 return;
mbed_official 0:51ac1d130fd4 119 }
mbed_official 0:51ac1d130fd4 120 LWIP_ASSERT("check that first pbuf can hold icmp message",
mbed_official 0:51ac1d130fd4 121 (q->len >= (8 + IP_HLEN + 8)));
mbed_official 0:51ac1d130fd4 122
mbed_official 0:51ac1d130fd4 123 iphdr = p->payload;
mbed_official 0:51ac1d130fd4 124
mbed_official 0:51ac1d130fd4 125 idur = q->payload;
mbed_official 0:51ac1d130fd4 126 idur->type = (u8_t)ICMP6_DUR;
mbed_official 0:51ac1d130fd4 127 idur->icode = (u8_t)t;
mbed_official 0:51ac1d130fd4 128
mbed_official 0:51ac1d130fd4 129 SMEMCPY((u8_t *)q->payload + 8, p->payload, IP_HLEN + 8);
mbed_official 0:51ac1d130fd4 130
mbed_official 0:51ac1d130fd4 131 /* calculate checksum */
mbed_official 0:51ac1d130fd4 132 idur->chksum = 0;
mbed_official 0:51ac1d130fd4 133 idur->chksum = inet_chksum(idur, q->len);
mbed_official 0:51ac1d130fd4 134 ICMP_STATS_INC(icmp.xmit);
mbed_official 0:51ac1d130fd4 135
mbed_official 0:51ac1d130fd4 136 ip_output(q, NULL,
mbed_official 0:51ac1d130fd4 137 (struct ip_addr *)&(iphdr->src), ICMP_TTL, IP_PROTO_ICMP);
mbed_official 0:51ac1d130fd4 138 pbuf_free(q);
mbed_official 0:51ac1d130fd4 139 }
mbed_official 0:51ac1d130fd4 140
mbed_official 0:51ac1d130fd4 141 void
mbed_official 0:51ac1d130fd4 142 icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t)
mbed_official 0:51ac1d130fd4 143 {
mbed_official 0:51ac1d130fd4 144 struct pbuf *q;
mbed_official 0:51ac1d130fd4 145 struct ip_hdr *iphdr;
mbed_official 0:51ac1d130fd4 146 struct icmp_te_hdr *tehdr;
mbed_official 0:51ac1d130fd4 147
mbed_official 0:51ac1d130fd4 148 LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded\n"));
mbed_official 0:51ac1d130fd4 149
mbed_official 0:51ac1d130fd4 150 /* @todo: can this be PBUF_LINK instead of PBUF_IP? */
mbed_official 0:51ac1d130fd4 151 q = pbuf_alloc(PBUF_IP, 8 + IP_HLEN + 8, PBUF_RAM);
mbed_official 0:51ac1d130fd4 152 /* ICMP header + IP header + 8 bytes of data */
mbed_official 0:51ac1d130fd4 153 if (q == NULL) {
mbed_official 0:51ac1d130fd4 154 LWIP_DEBUGF(ICMP_DEBUG, ("icmp_dest_unreach: failed to allocate pbuf for ICMP packet.\n"));
mbed_official 0:51ac1d130fd4 155 pbuf_free(p);
mbed_official 0:51ac1d130fd4 156 return;
mbed_official 0:51ac1d130fd4 157 }
mbed_official 0:51ac1d130fd4 158 LWIP_ASSERT("check that first pbuf can hold icmp message",
mbed_official 0:51ac1d130fd4 159 (q->len >= (8 + IP_HLEN + 8)));
mbed_official 0:51ac1d130fd4 160
mbed_official 0:51ac1d130fd4 161 iphdr = p->payload;
mbed_official 0:51ac1d130fd4 162
mbed_official 0:51ac1d130fd4 163 tehdr = q->payload;
mbed_official 0:51ac1d130fd4 164 tehdr->type = (u8_t)ICMP6_TE;
mbed_official 0:51ac1d130fd4 165 tehdr->icode = (u8_t)t;
mbed_official 0:51ac1d130fd4 166
mbed_official 0:51ac1d130fd4 167 /* copy fields from original packet */
mbed_official 0:51ac1d130fd4 168 SMEMCPY((u8_t *)q->payload + 8, (u8_t *)p->payload, IP_HLEN + 8);
mbed_official 0:51ac1d130fd4 169
mbed_official 0:51ac1d130fd4 170 /* calculate checksum */
mbed_official 0:51ac1d130fd4 171 tehdr->chksum = 0;
mbed_official 0:51ac1d130fd4 172 tehdr->chksum = inet_chksum(tehdr, q->len);
mbed_official 0:51ac1d130fd4 173 ICMP_STATS_INC(icmp.xmit);
mbed_official 0:51ac1d130fd4 174 ip_output(q, NULL,
mbed_official 0:51ac1d130fd4 175 (struct ip_addr *)&(iphdr->src), ICMP_TTL, IP_PROTO_ICMP);
mbed_official 0:51ac1d130fd4 176 pbuf_free(q);
mbed_official 0:51ac1d130fd4 177 }
mbed_official 0:51ac1d130fd4 178
mbed_official 0:51ac1d130fd4 179 #endif /* LWIP_ICMP */