| /* |
| * 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" |
| |
| #if LWIP_ICMP /* don't build if not configured for use in lwipopts.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; |
| |
| ICMP_STATS_INC(icmp.recv); |
| |
| /* 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); |
| ICMP_STATS_INC(icmp.lenerr); |
| 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))); |
| ICMP_STATS_INC(icmp.chkerr); |
| /* 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))); |
| ICMP_STATS_INC(icmp.xmit); |
| |
| /* 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)); |
| ICMP_STATS_INC(icmp.proterr); |
| ICMP_STATS_INC(icmp.drop); |
| } |
| |
| 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; |
| |
| /* @todo: can this be PBUF_LINK instead of PBUF_IP? */ |
| q = pbuf_alloc(PBUF_IP, 8 + IP_HLEN + 8, PBUF_RAM); |
| /* ICMP header + IP header + 8 bytes of data */ |
| if (q == NULL) { |
| LWIP_DEBUGF(ICMP_DEBUG, ("icmp_dest_unreach: failed to allocate pbuf for ICMP packet.\n")); |
| pbuf_free(p); |
| return; |
| } |
| LWIP_ASSERT("check that first pbuf can hold icmp message", |
| (q->len >= (8 + IP_HLEN + 8))); |
| |
| iphdr = p->payload; |
| |
| idur = q->payload; |
| idur->type = (u8_t)ICMP6_DUR; |
| idur->icode = (u8_t)t; |
| |
| SMEMCPY((u8_t *)q->payload + 8, p->payload, IP_HLEN + 8); |
| |
| /* calculate checksum */ |
| idur->chksum = 0; |
| idur->chksum = inet_chksum(idur, q->len); |
| ICMP_STATS_INC(icmp.xmit); |
| |
| 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")); |
| |
| /* @todo: can this be PBUF_LINK instead of PBUF_IP? */ |
| q = pbuf_alloc(PBUF_IP, 8 + IP_HLEN + 8, PBUF_RAM); |
| /* ICMP header + IP header + 8 bytes of data */ |
| if (q == NULL) { |
| LWIP_DEBUGF(ICMP_DEBUG, ("icmp_dest_unreach: failed to allocate pbuf for ICMP packet.\n")); |
| pbuf_free(p); |
| return; |
| } |
| LWIP_ASSERT("check that first pbuf can hold icmp message", |
| (q->len >= (8 + IP_HLEN + 8))); |
| |
| iphdr = p->payload; |
| |
| tehdr = q->payload; |
| tehdr->type = (u8_t)ICMP6_TE; |
| tehdr->icode = (u8_t)t; |
| |
| /* copy fields from original packet */ |
| SMEMCPY((u8_t *)q->payload + 8, (u8_t *)p->payload, IP_HLEN + 8); |
| |
| /* calculate checksum */ |
| tehdr->chksum = 0; |
| tehdr->chksum = inet_chksum(tehdr, q->len); |
| ICMP_STATS_INC(icmp.xmit); |
| ip_output(q, NULL, |
| (struct ip_addr *)&(iphdr->src), ICMP_TTL, IP_PROTO_ICMP); |
| pbuf_free(q); |
| } |
| |
| #endif /* LWIP_ICMP */ |