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lwip/core/ipv4/icmp.c@0:281d6ff68967, 2010-11-19 (annotated)

Committer:: hexley
Date:: Fri Nov 19 01:54:45 2010 +0000
Revision:: 0:281d6ff68967

Who changed what in which revision?

User	Revision	Line number	New contents of line
hexley	0:281d6ff68967	1	/**
hexley	0:281d6ff68967	2	* @file
hexley	0:281d6ff68967	3	* ICMP - Internet Control Message Protocol
hexley	0:281d6ff68967	4	*
hexley	0:281d6ff68967	5	*/
hexley	0:281d6ff68967	6
hexley	0:281d6ff68967	7	/*
hexley	0:281d6ff68967	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
hexley	0:281d6ff68967	9	* All rights reserved.
hexley	0:281d6ff68967	10	*
hexley	0:281d6ff68967	11	* Redistribution and use in source and binary forms, with or without modification,
hexley	0:281d6ff68967	12	* are permitted provided that the following conditions are met:
hexley	0:281d6ff68967	13	*
hexley	0:281d6ff68967	14	* 1. Redistributions of source code must retain the above copyright notice,
hexley	0:281d6ff68967	15	* this list of conditions and the following disclaimer.
hexley	0:281d6ff68967	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
hexley	0:281d6ff68967	17	* this list of conditions and the following disclaimer in the documentation
hexley	0:281d6ff68967	18	* and/or other materials provided with the distribution.
hexley	0:281d6ff68967	19	* 3. The name of the author may not be used to endorse or promote products
hexley	0:281d6ff68967	20	* derived from this software without specific prior written permission.
hexley	0:281d6ff68967	21	*
hexley	0:281d6ff68967	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
hexley	0:281d6ff68967	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
hexley	0:281d6ff68967	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
hexley	0:281d6ff68967	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
hexley	0:281d6ff68967	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
hexley	0:281d6ff68967	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
hexley	0:281d6ff68967	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
hexley	0:281d6ff68967	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
hexley	0:281d6ff68967	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
hexley	0:281d6ff68967	31	* OF SUCH DAMAGE.
hexley	0:281d6ff68967	32	*
hexley	0:281d6ff68967	33	* This file is part of the lwIP TCP/IP stack.
hexley	0:281d6ff68967	34	*
hexley	0:281d6ff68967	35	* Author: Adam Dunkels <adam@sics.se>
hexley	0:281d6ff68967	36	*
hexley	0:281d6ff68967	37	*/
hexley	0:281d6ff68967	38
hexley	0:281d6ff68967	39	/* Some ICMP messages should be passed to the transport protocols. This
hexley	0:281d6ff68967	40	is not implemented. */
hexley	0:281d6ff68967	41
hexley	0:281d6ff68967	42	#include "lwip/opt.h"
hexley	0:281d6ff68967	43
hexley	0:281d6ff68967	44	#if LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
hexley	0:281d6ff68967	45
hexley	0:281d6ff68967	46	#include "lwip/icmp.h"
hexley	0:281d6ff68967	47	#include "lwip/inet_chksum.h"
hexley	0:281d6ff68967	48	#include "lwip/ip.h"
hexley	0:281d6ff68967	49	#include "lwip/def.h"
hexley	0:281d6ff68967	50	#include "lwip/stats.h"
hexley	0:281d6ff68967	51	#include "lwip/snmp.h"
hexley	0:281d6ff68967	52
hexley	0:281d6ff68967	53	#include <string.h>
hexley	0:281d6ff68967	54
hexley	0:281d6ff68967	55	/** Small optimization: set to 0 if incoming PBUF_POOL pbuf always can be
hexley	0:281d6ff68967	56	* used to modify and send a response packet (and to 1 if this is not the case,
hexley	0:281d6ff68967	57	* e.g. when link header is stripped of when receiving) */
hexley	0:281d6ff68967	58	#ifndef LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
hexley	0:281d6ff68967	59	#define LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN 1
hexley	0:281d6ff68967	60	#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
hexley	0:281d6ff68967	61
hexley	0:281d6ff68967	62	/* The amount of data from the original packet to return in a dest-unreachable */
hexley	0:281d6ff68967	63	#define ICMP_DEST_UNREACH_DATASIZE 8
hexley	0:281d6ff68967	64
hexley	0:281d6ff68967	65	static void icmp_send_response(struct pbuf *p, u8_t type, u8_t code);
hexley	0:281d6ff68967	66
hexley	0:281d6ff68967	67	/**
hexley	0:281d6ff68967	68	* Processes ICMP input packets, called from ip_input().
hexley	0:281d6ff68967	69	*
hexley	0:281d6ff68967	70	* Currently only processes icmp echo requests and sends
hexley	0:281d6ff68967	71	* out the echo response.
hexley	0:281d6ff68967	72	*
hexley	0:281d6ff68967	73	* @param p the icmp echo request packet, p->payload pointing to the ip header
hexley	0:281d6ff68967	74	* @param inp the netif on which this packet was received
hexley	0:281d6ff68967	75	*/
hexley	0:281d6ff68967	76	void
hexley	0:281d6ff68967	77	icmp_input(struct pbuf p, struct netif inp)
hexley	0:281d6ff68967	78	{
hexley	0:281d6ff68967	79	u8_t type;
hexley	0:281d6ff68967	80	#ifdef LWIP_DEBUG
hexley	0:281d6ff68967	81	u8_t code;
hexley	0:281d6ff68967	82	#endif /* LWIP_DEBUG */
hexley	0:281d6ff68967	83	struct icmp_echo_hdr *iecho;
hexley	0:281d6ff68967	84	struct ip_hdr *iphdr;
hexley	0:281d6ff68967	85	s16_t hlen;
hexley	0:281d6ff68967	86
hexley	0:281d6ff68967	87	ICMP_STATS_INC(icmp.recv);
hexley	0:281d6ff68967	88	snmp_inc_icmpinmsgs();
hexley	0:281d6ff68967	89
hexley	0:281d6ff68967	90
hexley	0:281d6ff68967	91	iphdr = (struct ip_hdr *)p->payload;
hexley	0:281d6ff68967	92	hlen = IPH_HL(iphdr) * 4;
hexley	0:281d6ff68967	93	if (pbuf_header(p, -hlen) \|\| (p->tot_len < sizeof(u16_t)*2)) {
hexley	0:281d6ff68967	94	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: short ICMP (%"U16_F" bytes) received\n", p->tot_len));
hexley	0:281d6ff68967	95	goto lenerr;
hexley	0:281d6ff68967	96	}
hexley	0:281d6ff68967	97
hexley	0:281d6ff68967	98	type = ((u8_t )p->payload);
hexley	0:281d6ff68967	99	#ifdef LWIP_DEBUG
hexley	0:281d6ff68967	100	code = (((u8_t )p->payload)+1);
hexley	0:281d6ff68967	101	#endif /* LWIP_DEBUG */
hexley	0:281d6ff68967	102	switch (type) {
hexley	0:281d6ff68967	103	case ICMP_ER:
hexley	0:281d6ff68967	104	/* This is OK, echo reply might have been parsed by a raw PCB
hexley	0:281d6ff68967	105	(as obviously, an echo request has been sent, too). */
hexley	0:281d6ff68967	106	break;
hexley	0:281d6ff68967	107	case ICMP_ECHO:
hexley	0:281d6ff68967	108	#if !LWIP_MULTICAST_PING \|\| !LWIP_BROADCAST_PING
hexley	0:281d6ff68967	109	{
hexley	0:281d6ff68967	110	int accepted = 1;
hexley	0:281d6ff68967	111	#if !LWIP_MULTICAST_PING
hexley	0:281d6ff68967	112	/* multicast destination address? */
hexley	0:281d6ff68967	113	if (ip_addr_ismulticast(&current_iphdr_dest)) {
hexley	0:281d6ff68967	114	accepted = 0;
hexley	0:281d6ff68967	115	}
hexley	0:281d6ff68967	116	#endif /* LWIP_MULTICAST_PING */
hexley	0:281d6ff68967	117	#if !LWIP_BROADCAST_PING
hexley	0:281d6ff68967	118	/* broadcast destination address? */
hexley	0:281d6ff68967	119	if (ip_addr_isbroadcast(&current_iphdr_dest, inp)) {
hexley	0:281d6ff68967	120	accepted = 0;
hexley	0:281d6ff68967	121	}
hexley	0:281d6ff68967	122	#endif /* LWIP_BROADCAST_PING */
hexley	0:281d6ff68967	123	/* broadcast or multicast destination address not acceptd? */
hexley	0:281d6ff68967	124	if (!accepted) {
hexley	0:281d6ff68967	125	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: Not echoing to multicast or broadcast pings\n"));
hexley	0:281d6ff68967	126	ICMP_STATS_INC(icmp.err);
hexley	0:281d6ff68967	127	pbuf_free(p);
hexley	0:281d6ff68967	128	return;
hexley	0:281d6ff68967	129	}
hexley	0:281d6ff68967	130	}
hexley	0:281d6ff68967	131	#endif /* !LWIP_MULTICAST_PING \|\| !LWIP_BROADCAST_PING */
hexley	0:281d6ff68967	132	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ping\n"));
hexley	0:281d6ff68967	133	if (p->tot_len < sizeof(struct icmp_echo_hdr)) {
hexley	0:281d6ff68967	134	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: bad ICMP echo received\n"));
hexley	0:281d6ff68967	135	goto lenerr;
hexley	0:281d6ff68967	136	}
hexley	0:281d6ff68967	137	if (inet_chksum_pbuf(p) != 0) {
hexley	0:281d6ff68967	138	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: checksum failed for received ICMP echo\n"));
hexley	0:281d6ff68967	139	pbuf_free(p);
hexley	0:281d6ff68967	140	ICMP_STATS_INC(icmp.chkerr);
hexley	0:281d6ff68967	141	snmp_inc_icmpinerrors();
hexley	0:281d6ff68967	142	return;
hexley	0:281d6ff68967	143	}
hexley	0:281d6ff68967	144	#if LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
hexley	0:281d6ff68967	145	if (pbuf_header(p, (PBUF_IP_HLEN + PBUF_LINK_HLEN))) {
hexley	0:281d6ff68967	146	/* p is not big enough to contain link headers
hexley	0:281d6ff68967	147	* allocate a new one and copy p into it
hexley	0:281d6ff68967	148	*/
hexley	0:281d6ff68967	149	struct pbuf *r;
hexley	0:281d6ff68967	150	/* switch p->payload to ip header */
hexley	0:281d6ff68967	151	if (pbuf_header(p, hlen)) {
hexley	0:281d6ff68967	152	LWIP_ASSERT("icmp_input: moving p->payload to ip header failed\n", 0);
hexley	0:281d6ff68967	153	goto memerr;
hexley	0:281d6ff68967	154	}
hexley	0:281d6ff68967	155	/* allocate new packet buffer with space for link headers */
hexley	0:281d6ff68967	156	r = pbuf_alloc(PBUF_LINK, p->tot_len, PBUF_RAM);
hexley	0:281d6ff68967	157	if (r == NULL) {
hexley	0:281d6ff68967	158	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: allocating new pbuf failed\n"));
hexley	0:281d6ff68967	159	goto memerr;
hexley	0:281d6ff68967	160	}
hexley	0:281d6ff68967	161	LWIP_ASSERT("check that first pbuf can hold struct the ICMP header",
hexley	0:281d6ff68967	162	(r->len >= hlen + sizeof(struct icmp_echo_hdr)));
hexley	0:281d6ff68967	163	/* copy the whole packet including ip header */
hexley	0:281d6ff68967	164	if (pbuf_copy(r, p) != ERR_OK) {
hexley	0:281d6ff68967	165	LWIP_ASSERT("icmp_input: copying to new pbuf failed\n", 0);
hexley	0:281d6ff68967	166	goto memerr;
hexley	0:281d6ff68967	167	}
hexley	0:281d6ff68967	168	iphdr = (struct ip_hdr *)r->payload;
hexley	0:281d6ff68967	169	/* switch r->payload back to icmp header */
hexley	0:281d6ff68967	170	if (pbuf_header(r, -hlen)) {
hexley	0:281d6ff68967	171	LWIP_ASSERT("icmp_input: restoring original p->payload failed\n", 0);
hexley	0:281d6ff68967	172	goto memerr;
hexley	0:281d6ff68967	173	}
hexley	0:281d6ff68967	174	/* free the original p */
hexley	0:281d6ff68967	175	pbuf_free(p);
hexley	0:281d6ff68967	176	/* we now have an identical copy of p that has room for link headers */
hexley	0:281d6ff68967	177	p = r;
hexley	0:281d6ff68967	178	} else {
hexley	0:281d6ff68967	179	/* restore p->payload to point to icmp header */
hexley	0:281d6ff68967	180	if (pbuf_header(p, -(s16_t)(PBUF_IP_HLEN + PBUF_LINK_HLEN))) {
hexley	0:281d6ff68967	181	LWIP_ASSERT("icmp_input: restoring original p->payload failed\n", 0);
hexley	0:281d6ff68967	182	goto memerr;
hexley	0:281d6ff68967	183	}
hexley	0:281d6ff68967	184	}
hexley	0:281d6ff68967	185	#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
hexley	0:281d6ff68967	186	/* At this point, all checks are OK. */
hexley	0:281d6ff68967	187	/* We generate an answer by switching the dest and src ip addresses,
hexley	0:281d6ff68967	188	* setting the icmp type to ECHO_RESPONSE and updating the checksum. */
hexley	0:281d6ff68967	189	iecho = (struct icmp_echo_hdr *)p->payload;
hexley	0:281d6ff68967	190	ip_addr_copy(iphdr->src, *ip_current_dest_addr());
hexley	0:281d6ff68967	191	ip_addr_copy(iphdr->dest, *ip_current_src_addr());
hexley	0:281d6ff68967	192	ICMPH_TYPE_SET(iecho, ICMP_ER);
hexley	0:281d6ff68967	193	/* adjust the checksum */
hexley	0:281d6ff68967	194	if (iecho->chksum >= PP_HTONS(0xffff - (ICMP_ECHO << 8))) {
hexley	0:281d6ff68967	195	iecho->chksum += PP_HTONS(ICMP_ECHO << 8) + 1;
hexley	0:281d6ff68967	196	} else {
hexley	0:281d6ff68967	197	iecho->chksum += PP_HTONS(ICMP_ECHO << 8);
hexley	0:281d6ff68967	198	}
hexley	0:281d6ff68967	199
hexley	0:281d6ff68967	200	/* Set the correct TTL and recalculate the header checksum. */
hexley	0:281d6ff68967	201	IPH_TTL_SET(iphdr, ICMP_TTL);
hexley	0:281d6ff68967	202	IPH_CHKSUM_SET(iphdr, 0);
hexley	0:281d6ff68967	203	#if CHECKSUM_GEN_IP
hexley	0:281d6ff68967	204	IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, IP_HLEN));
hexley	0:281d6ff68967	205	#endif /* CHECKSUM_GEN_IP */
hexley	0:281d6ff68967	206
hexley	0:281d6ff68967	207	ICMP_STATS_INC(icmp.xmit);
hexley	0:281d6ff68967	208	/* increase number of messages attempted to send */
hexley	0:281d6ff68967	209	snmp_inc_icmpoutmsgs();
hexley	0:281d6ff68967	210	/* increase number of echo replies attempted to send */
hexley	0:281d6ff68967	211	snmp_inc_icmpoutechoreps();
hexley	0:281d6ff68967	212
hexley	0:281d6ff68967	213	if(pbuf_header(p, hlen)) {
hexley	0:281d6ff68967	214	LWIP_ASSERT("Can't move over header in packet", 0);
hexley	0:281d6ff68967	215	} else {
hexley	0:281d6ff68967	216	err_t ret;
hexley	0:281d6ff68967	217	/* send an ICMP packet, src addr is the dest addr of the curren packet */
hexley	0:281d6ff68967	218	ret = ip_output_if(p, ip_current_dest_addr(), IP_HDRINCL,
hexley	0:281d6ff68967	219	ICMP_TTL, 0, IP_PROTO_ICMP, inp);
hexley	0:281d6ff68967	220	if (ret != ERR_OK) {
hexley	0:281d6ff68967	221	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ip_output_if returned an error: %c.\n", ret));
hexley	0:281d6ff68967	222	}
hexley	0:281d6ff68967	223	}
hexley	0:281d6ff68967	224	break;
hexley	0:281d6ff68967	225	default:
hexley	0:281d6ff68967	226	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ICMP type %"S16_F" code %"S16_F" not supported.\n",
hexley	0:281d6ff68967	227	(s16_t)type, (s16_t)code));
hexley	0:281d6ff68967	228	ICMP_STATS_INC(icmp.proterr);
hexley	0:281d6ff68967	229	ICMP_STATS_INC(icmp.drop);
hexley	0:281d6ff68967	230	}
hexley	0:281d6ff68967	231	pbuf_free(p);
hexley	0:281d6ff68967	232	return;
hexley	0:281d6ff68967	233	lenerr:
hexley	0:281d6ff68967	234	pbuf_free(p);
hexley	0:281d6ff68967	235	ICMP_STATS_INC(icmp.lenerr);
hexley	0:281d6ff68967	236	snmp_inc_icmpinerrors();
hexley	0:281d6ff68967	237	return;
hexley	0:281d6ff68967	238	#if LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
hexley	0:281d6ff68967	239	memerr:
hexley	0:281d6ff68967	240	pbuf_free(p);
hexley	0:281d6ff68967	241	ICMP_STATS_INC(icmp.err);
hexley	0:281d6ff68967	242	snmp_inc_icmpinerrors();
hexley	0:281d6ff68967	243	return;
hexley	0:281d6ff68967	244	#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
hexley	0:281d6ff68967	245	}
hexley	0:281d6ff68967	246
hexley	0:281d6ff68967	247	/**
hexley	0:281d6ff68967	248	* Send an icmp 'destination unreachable' packet, called from ip_input() if
hexley	0:281d6ff68967	249	* the transport layer protocol is unknown and from udp_input() if the local
hexley	0:281d6ff68967	250	* port is not bound.
hexley	0:281d6ff68967	251	*
hexley	0:281d6ff68967	252	* @param p the input packet for which the 'unreachable' should be sent,
hexley	0:281d6ff68967	253	* p->payload pointing to the IP header
hexley	0:281d6ff68967	254	* @param t type of the 'unreachable' packet
hexley	0:281d6ff68967	255	*/
hexley	0:281d6ff68967	256	void
hexley	0:281d6ff68967	257	icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t)
hexley	0:281d6ff68967	258	{
hexley	0:281d6ff68967	259	icmp_send_response(p, ICMP_DUR, t);
hexley	0:281d6ff68967	260	}
hexley	0:281d6ff68967	261
hexley	0:281d6ff68967	262	#if IP_FORWARD \|\| IP_REASSEMBLY
hexley	0:281d6ff68967	263	/**
hexley	0:281d6ff68967	264	* Send a 'time exceeded' packet, called from ip_forward() if TTL is 0.
hexley	0:281d6ff68967	265	*
hexley	0:281d6ff68967	266	* @param p the input packet for which the 'time exceeded' should be sent,
hexley	0:281d6ff68967	267	* p->payload pointing to the IP header
hexley	0:281d6ff68967	268	* @param t type of the 'time exceeded' packet
hexley	0:281d6ff68967	269	*/
hexley	0:281d6ff68967	270	void
hexley	0:281d6ff68967	271	icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t)
hexley	0:281d6ff68967	272	{
hexley	0:281d6ff68967	273	icmp_send_response(p, ICMP_TE, t);
hexley	0:281d6ff68967	274	}
hexley	0:281d6ff68967	275
hexley	0:281d6ff68967	276	#endif /* IP_FORWARD \|\| IP_REASSEMBLY */
hexley	0:281d6ff68967	277
hexley	0:281d6ff68967	278	/**
hexley	0:281d6ff68967	279	* Send an icmp packet in response to an incoming packet.
hexley	0:281d6ff68967	280	*
hexley	0:281d6ff68967	281	* @param p the input packet for which the 'unreachable' should be sent,
hexley	0:281d6ff68967	282	* p->payload pointing to the IP header
hexley	0:281d6ff68967	283	* @param type Type of the ICMP header
hexley	0:281d6ff68967	284	* @param code Code of the ICMP header
hexley	0:281d6ff68967	285	*/
hexley	0:281d6ff68967	286	static void
hexley	0:281d6ff68967	287	icmp_send_response(struct pbuf *p, u8_t type, u8_t code)
hexley	0:281d6ff68967	288	{
hexley	0:281d6ff68967	289	struct pbuf *q;
hexley	0:281d6ff68967	290	struct ip_hdr *iphdr;
hexley	0:281d6ff68967	291	/* we can use the echo header here */
hexley	0:281d6ff68967	292	struct icmp_echo_hdr *icmphdr;
hexley	0:281d6ff68967	293	ip_addr_t iphdr_src;
hexley	0:281d6ff68967	294
hexley	0:281d6ff68967	295	/* ICMP header + IP header + 8 bytes of data */
hexley	0:281d6ff68967	296	q = pbuf_alloc(PBUF_IP, sizeof(struct icmp_echo_hdr) + IP_HLEN + ICMP_DEST_UNREACH_DATASIZE,
hexley	0:281d6ff68967	297	PBUF_RAM);
hexley	0:281d6ff68967	298	if (q == NULL) {
hexley	0:281d6ff68967	299	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded: failed to allocate pbuf for ICMP packet.\n"));
hexley	0:281d6ff68967	300	return;
hexley	0:281d6ff68967	301	}
hexley	0:281d6ff68967	302	LWIP_ASSERT("check that first pbuf can hold icmp message",
hexley	0:281d6ff68967	303	(q->len >= (sizeof(struct icmp_echo_hdr) + IP_HLEN + ICMP_DEST_UNREACH_DATASIZE)));
hexley	0:281d6ff68967	304
hexley	0:281d6ff68967	305	iphdr = (struct ip_hdr *)p->payload;
hexley	0:281d6ff68967	306	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded from "));
hexley	0:281d6ff68967	307	ip_addr_debug_print(ICMP_DEBUG, &(iphdr->src));
hexley	0:281d6ff68967	308	LWIP_DEBUGF(ICMP_DEBUG, (" to "));
hexley	0:281d6ff68967	309	ip_addr_debug_print(ICMP_DEBUG, &(iphdr->dest));
hexley	0:281d6ff68967	310	LWIP_DEBUGF(ICMP_DEBUG, ("\n"));
hexley	0:281d6ff68967	311
hexley	0:281d6ff68967	312	icmphdr = (struct icmp_echo_hdr *)q->payload;
hexley	0:281d6ff68967	313	icmphdr->type = type;
hexley	0:281d6ff68967	314	icmphdr->code = code;
hexley	0:281d6ff68967	315	icmphdr->id = 0;
hexley	0:281d6ff68967	316	icmphdr->seqno = 0;
hexley	0:281d6ff68967	317
hexley	0:281d6ff68967	318	/* copy fields from original packet */
hexley	0:281d6ff68967	319	SMEMCPY((u8_t )q->payload + sizeof(struct icmp_echo_hdr), (u8_t )p->payload,
hexley	0:281d6ff68967	320	IP_HLEN + ICMP_DEST_UNREACH_DATASIZE);
hexley	0:281d6ff68967	321
hexley	0:281d6ff68967	322	/* calculate checksum */
hexley	0:281d6ff68967	323	icmphdr->chksum = 0;
hexley	0:281d6ff68967	324	icmphdr->chksum = inet_chksum(icmphdr, q->len);
hexley	0:281d6ff68967	325	ICMP_STATS_INC(icmp.xmit);
hexley	0:281d6ff68967	326	/* increase number of messages attempted to send */
hexley	0:281d6ff68967	327	snmp_inc_icmpoutmsgs();
hexley	0:281d6ff68967	328	/* increase number of destination unreachable messages attempted to send */
hexley	0:281d6ff68967	329	snmp_inc_icmpouttimeexcds();
hexley	0:281d6ff68967	330	ip_addr_copy(iphdr_src, iphdr->src);
hexley	0:281d6ff68967	331	ip_output(q, NULL, &iphdr_src, ICMP_TTL, 0, IP_PROTO_ICMP);
hexley	0:281d6ff68967	332	pbuf_free(q);
hexley	0:281d6ff68967	333	}
hexley	0:281d6ff68967	334
hexley	0:281d6ff68967	335	#endif /* LWIP_ICMP */

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Type:	Library
Created:	19 Nov 2010
Imports:	44
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	0
Followers:	1

lwip/core/ipv4/icmp.c@0:281d6ff68967, 2010-11-19 (annotated)

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