/* | |
* 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" | |
#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) | |
{ | |
unsigned char type; | |
struct icmp_echo_hdr *iecho; | |
struct ip_hdr *iphdr; | |
struct ip_addr tmpaddr; | |
#ifdef ICMP_STATS | |
++lwip_stats.icmp.recv; | |
#endif /* ICMP_STATS */ | |
/* TODO: check length before accessing payload! */ | |
type = ((char *)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); | |
#ifdef ICMP_STATS | |
++lwip_stats.icmp.lenerr; | |
#endif /* ICMP_STATS */ | |
return; | |
} | |
iecho = p->payload; | |
iphdr = (struct ip_hdr *)((char *)p->payload - IP_HLEN); | |
if (inet_chksum_pbuf(p) != 0) { | |
LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: checksum failed for received ICMP echo (%x)\n", inet_chksum_pseudo(p, &(iphdr->src), &(iphdr->dest), IP_PROTO_ICMP, p->tot_len))); | |
#ifdef ICMP_STATS | |
++lwip_stats.icmp.chkerr; | |
#endif /* ICMP_STATS */ | |
/* return;*/ | |
} | |
LWIP_DEBUGF(ICMP_DEBUG, ("icmp: p->len %d p->tot_len %d\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 (%x)\n", inet_chksum_pseudo(p, &(iphdr->src), &(iphdr->dest), IP_PROTO_ICMP, p->tot_len))); | |
#ifdef ICMP_STATS | |
++lwip_stats.icmp.xmit; | |
#endif /* ICMP_STATS */ | |
/* LWIP_DEBUGF("icmp: p->len %u p->tot_len %u\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 %d not supported.\n", (int)type)); | |
#ifdef ICMP_STATS | |
++lwip_stats.icmp.proterr; | |
++lwip_stats.icmp.drop; | |
#endif /* ICMP_STATS */ | |
} | |
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; | |
q = pbuf_alloc(PBUF_IP, 8 + IP_HLEN + 8, PBUF_RAM); | |
/* ICMP header + IP header + 8 bytes of data */ | |
iphdr = p->payload; | |
idur = q->payload; | |
idur->type = (char)ICMP6_DUR; | |
idur->icode = (char)t; | |
memcpy((char *)q->payload + 8, p->payload, IP_HLEN + 8); | |
/* calculate checksum */ | |
idur->chksum = 0; | |
idur->chksum = inet_chksum(idur, q->len); | |
#ifdef ICMP_STATS | |
++lwip_stats.icmp.xmit; | |
#endif /* ICMP_STATS */ | |
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")); | |
q = pbuf_alloc(PBUF_IP, 8 + IP_HLEN + 8, PBUF_RAM); | |
iphdr = p->payload; | |
tehdr = q->payload; | |
tehdr->type = (char)ICMP6_TE; | |
tehdr->icode = (char)t; | |
/* copy fields from original packet */ | |
memcpy((char *)q->payload + 8, (char *)p->payload, IP_HLEN + 8); | |
/* calculate checksum */ | |
tehdr->chksum = 0; | |
tehdr->chksum = inet_chksum(tehdr, q->len); | |
#ifdef ICMP_STATS | |
++lwip_stats.icmp.xmit; | |
#endif /* ICMP_STATS */ | |
ip_output(q, NULL, | |
(struct ip_addr *)&(iphdr->src), ICMP_TTL, IP_PROTO_ICMP); | |
pbuf_free(q); | |
} | |