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