Bonjour - First step: AutoIP compiled in and working

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Darran Shepherd / Mbed 2 deprecated Bonjour

First step: AutoIP compiled in and working

lwip/core/ipv4/icmp.c@1:4218cacaf696, 2010-06-18 (annotated)

Committer:: darran
Date:: Fri Jun 18 15:54:21 2010 +0000
Revision:: 1:4218cacaf696
Parent:: 0:55a05330f8cc

Who changed what in which revision?

User	Revision	Line number	New contents of line
darran	0:55a05330f8cc	1	/**
darran	0:55a05330f8cc	2	* @file
darran	0:55a05330f8cc	3	* ICMP - Internet Control Message Protocol
darran	0:55a05330f8cc	4	*
darran	0:55a05330f8cc	5	*/
darran	0:55a05330f8cc	6
darran	0:55a05330f8cc	7	/*
darran	0:55a05330f8cc	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
darran	0:55a05330f8cc	9	* All rights reserved.
darran	0:55a05330f8cc	10	*
darran	0:55a05330f8cc	11	* Redistribution and use in source and binary forms, with or without modification,
darran	0:55a05330f8cc	12	* are permitted provided that the following conditions are met:
darran	0:55a05330f8cc	13	*
darran	0:55a05330f8cc	14	* 1. Redistributions of source code must retain the above copyright notice,
darran	0:55a05330f8cc	15	* this list of conditions and the following disclaimer.
darran	0:55a05330f8cc	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
darran	0:55a05330f8cc	17	* this list of conditions and the following disclaimer in the documentation
darran	0:55a05330f8cc	18	* and/or other materials provided with the distribution.
darran	0:55a05330f8cc	19	* 3. The name of the author may not be used to endorse or promote products
darran	0:55a05330f8cc	20	* derived from this software without specific prior written permission.
darran	0:55a05330f8cc	21	*
darran	0:55a05330f8cc	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
darran	0:55a05330f8cc	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
darran	0:55a05330f8cc	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
darran	0:55a05330f8cc	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
darran	0:55a05330f8cc	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
darran	0:55a05330f8cc	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
darran	0:55a05330f8cc	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
darran	0:55a05330f8cc	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
darran	0:55a05330f8cc	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
darran	0:55a05330f8cc	31	* OF SUCH DAMAGE.
darran	0:55a05330f8cc	32	*
darran	0:55a05330f8cc	33	* This file is part of the lwIP TCP/IP stack.
darran	0:55a05330f8cc	34	*
darran	0:55a05330f8cc	35	* Author: Adam Dunkels <adam@sics.se>
darran	0:55a05330f8cc	36	*
darran	0:55a05330f8cc	37	*/
darran	0:55a05330f8cc	38
darran	0:55a05330f8cc	39	/* Some ICMP messages should be passed to the transport protocols. This
darran	0:55a05330f8cc	40	is not implemented. */
darran	0:55a05330f8cc	41
darran	0:55a05330f8cc	42	#include "lwip/opt.h"
darran	0:55a05330f8cc	43
darran	0:55a05330f8cc	44	#if LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
darran	0:55a05330f8cc	45
darran	0:55a05330f8cc	46	#include "lwip/icmp.h"
darran	0:55a05330f8cc	47	#include "lwip/inet_chksum.h"
darran	0:55a05330f8cc	48	#include "lwip/ip.h"
darran	0:55a05330f8cc	49	#include "lwip/def.h"
darran	0:55a05330f8cc	50	#include "lwip/stats.h"
darran	0:55a05330f8cc	51	#include "lwip/snmp.h"
darran	0:55a05330f8cc	52
darran	0:55a05330f8cc	53	#include <string.h>
darran	0:55a05330f8cc	54
darran	0:55a05330f8cc	55	/** Small optimization: set to 0 if incoming PBUF_POOL pbuf always can be
darran	0:55a05330f8cc	56	* used to modify and send a response packet (and to 1 if this is not the case,
darran	0:55a05330f8cc	57	* e.g. when link header is stripped of when receiving) */
darran	0:55a05330f8cc	58	#ifndef LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
darran	0:55a05330f8cc	59	#define LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN 1
darran	0:55a05330f8cc	60	#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
darran	0:55a05330f8cc	61
darran	0:55a05330f8cc	62	/* The amount of data from the original packet to return in a dest-unreachable */
darran	0:55a05330f8cc	63	#define ICMP_DEST_UNREACH_DATASIZE 8
darran	0:55a05330f8cc	64
darran	0:55a05330f8cc	65	static void icmp_send_response(struct pbuf *p, u8_t type, u8_t code);
darran	0:55a05330f8cc	66
darran	0:55a05330f8cc	67	/**
darran	0:55a05330f8cc	68	* Processes ICMP input packets, called from ip_input().
darran	0:55a05330f8cc	69	*
darran	0:55a05330f8cc	70	* Currently only processes icmp echo requests and sends
darran	0:55a05330f8cc	71	* out the echo response.
darran	0:55a05330f8cc	72	*
darran	0:55a05330f8cc	73	* @param p the icmp echo request packet, p->payload pointing to the ip header
darran	0:55a05330f8cc	74	* @param inp the netif on which this packet was received
darran	0:55a05330f8cc	75	*/
darran	0:55a05330f8cc	76	void
darran	0:55a05330f8cc	77	icmp_input(struct pbuf p, struct netif inp)
darran	0:55a05330f8cc	78	{
darran	0:55a05330f8cc	79	u8_t type;
darran	0:55a05330f8cc	80	#ifdef LWIP_DEBUG
darran	0:55a05330f8cc	81	u8_t code;
darran	0:55a05330f8cc	82	#endif /* LWIP_DEBUG */
darran	0:55a05330f8cc	83	struct icmp_echo_hdr *iecho;
darran	0:55a05330f8cc	84	struct ip_hdr *iphdr;
darran	0:55a05330f8cc	85	ip_addr_t tmpaddr;
darran	0:55a05330f8cc	86	s16_t hlen;
darran	0:55a05330f8cc	87
darran	0:55a05330f8cc	88	ICMP_STATS_INC(icmp.recv);
darran	0:55a05330f8cc	89	snmp_inc_icmpinmsgs();
darran	0:55a05330f8cc	90
darran	0:55a05330f8cc	91
darran	0:55a05330f8cc	92	iphdr = (struct ip_hdr *)p->payload;
darran	0:55a05330f8cc	93	hlen = IPH_HL(iphdr) * 4;
darran	0:55a05330f8cc	94	if (pbuf_header(p, -hlen) \|\| (p->tot_len < sizeof(u16_t)*2)) {
darran	0:55a05330f8cc	95	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: short ICMP (%"U16_F" bytes) received\n", p->tot_len));
darran	0:55a05330f8cc	96	goto lenerr;
darran	0:55a05330f8cc	97	}
darran	0:55a05330f8cc	98
darran	0:55a05330f8cc	99	type = ((u8_t )p->payload);
darran	0:55a05330f8cc	100	#ifdef LWIP_DEBUG
darran	0:55a05330f8cc	101	code = (((u8_t )p->payload)+1);
darran	0:55a05330f8cc	102	#endif /* LWIP_DEBUG */
darran	0:55a05330f8cc	103	switch (type) {
darran	0:55a05330f8cc	104	case ICMP_ER:
darran	0:55a05330f8cc	105	/* This is OK, echo reply might have been parsed by a raw PCB
darran	0:55a05330f8cc	106	(as obviously, an echo request has been sent, too). */
darran	0:55a05330f8cc	107	break;
darran	0:55a05330f8cc	108	case ICMP_ECHO:
darran	0:55a05330f8cc	109	#if !LWIP_MULTICAST_PING \|\| !LWIP_BROADCAST_PING
darran	0:55a05330f8cc	110	{
darran	0:55a05330f8cc	111	int accepted = 1;
darran	0:55a05330f8cc	112	#if !LWIP_MULTICAST_PING
darran	0:55a05330f8cc	113	/* multicast destination address? */
darran	0:55a05330f8cc	114	if (ip_addr_ismulticast(&iphdr->dest)) {
darran	0:55a05330f8cc	115	accepted = 0;
darran	0:55a05330f8cc	116	}
darran	0:55a05330f8cc	117	#endif /* LWIP_MULTICAST_PING */
darran	0:55a05330f8cc	118	#if !LWIP_BROADCAST_PING
darran	0:55a05330f8cc	119	/* broadcast destination address? */
darran	0:55a05330f8cc	120	if (ip_addr_isbroadcast(&iphdr->dest, inp)) {
darran	0:55a05330f8cc	121	accepted = 0;
darran	0:55a05330f8cc	122	}
darran	0:55a05330f8cc	123	#endif /* LWIP_BROADCAST_PING */
darran	0:55a05330f8cc	124	/* broadcast or multicast destination address not acceptd? */
darran	0:55a05330f8cc	125	if (!accepted) {
darran	0:55a05330f8cc	126	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: Not echoing to multicast or broadcast pings\n"));
darran	0:55a05330f8cc	127	ICMP_STATS_INC(icmp.err);
darran	0:55a05330f8cc	128	pbuf_free(p);
darran	0:55a05330f8cc	129	return;
darran	0:55a05330f8cc	130	}
darran	0:55a05330f8cc	131	}
darran	0:55a05330f8cc	132	#endif /* !LWIP_MULTICAST_PING \|\| !LWIP_BROADCAST_PING */
darran	0:55a05330f8cc	133	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ping\n"));
darran	0:55a05330f8cc	134	if (p->tot_len < sizeof(struct icmp_echo_hdr)) {
darran	0:55a05330f8cc	135	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: bad ICMP echo received\n"));
darran	0:55a05330f8cc	136	goto lenerr;
darran	0:55a05330f8cc	137	}
darran	0:55a05330f8cc	138	if (inet_chksum_pbuf(p) != 0) {
darran	0:55a05330f8cc	139	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: checksum failed for received ICMP echo\n"));
darran	0:55a05330f8cc	140	pbuf_free(p);
darran	0:55a05330f8cc	141	ICMP_STATS_INC(icmp.chkerr);
darran	0:55a05330f8cc	142	snmp_inc_icmpinerrors();
darran	0:55a05330f8cc	143	return;
darran	0:55a05330f8cc	144	}
darran	0:55a05330f8cc	145	#if LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
darran	0:55a05330f8cc	146	if (pbuf_header(p, (PBUF_IP_HLEN + PBUF_LINK_HLEN))) {
darran	0:55a05330f8cc	147	/* p is not big enough to contain link headers
darran	0:55a05330f8cc	148	* allocate a new one and copy p into it
darran	0:55a05330f8cc	149	*/
darran	0:55a05330f8cc	150	struct pbuf *r;
darran	0:55a05330f8cc	151	/* switch p->payload to ip header */
darran	0:55a05330f8cc	152	if (pbuf_header(p, hlen)) {
darran	0:55a05330f8cc	153	LWIP_ASSERT("icmp_input: moving p->payload to ip header failed\n", 0);
darran	0:55a05330f8cc	154	goto memerr;
darran	0:55a05330f8cc	155	}
darran	0:55a05330f8cc	156	/* allocate new packet buffer with space for link headers */
darran	0:55a05330f8cc	157	r = pbuf_alloc(PBUF_LINK, p->tot_len, PBUF_RAM);
darran	0:55a05330f8cc	158	if (r == NULL) {
darran	0:55a05330f8cc	159	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: allocating new pbuf failed\n"));
darran	0:55a05330f8cc	160	goto memerr;
darran	0:55a05330f8cc	161	}
darran	0:55a05330f8cc	162	LWIP_ASSERT("check that first pbuf can hold struct the ICMP header",
darran	0:55a05330f8cc	163	(r->len >= hlen + sizeof(struct icmp_echo_hdr)));
darran	0:55a05330f8cc	164	/* copy the whole packet including ip header */
darran	0:55a05330f8cc	165	if (pbuf_copy(r, p) != ERR_OK) {
darran	0:55a05330f8cc	166	LWIP_ASSERT("icmp_input: copying to new pbuf failed\n", 0);
darran	0:55a05330f8cc	167	goto memerr;
darran	0:55a05330f8cc	168	}
darran	0:55a05330f8cc	169	iphdr = (struct ip_hdr *)r->payload;
darran	0:55a05330f8cc	170	/* switch r->payload back to icmp header */
darran	0:55a05330f8cc	171	if (pbuf_header(r, -hlen)) {
darran	0:55a05330f8cc	172	LWIP_ASSERT("icmp_input: restoring original p->payload failed\n", 0);
darran	0:55a05330f8cc	173	goto memerr;
darran	0:55a05330f8cc	174	}
darran	0:55a05330f8cc	175	/* free the original p */
darran	0:55a05330f8cc	176	pbuf_free(p);
darran	0:55a05330f8cc	177	/* we now have an identical copy of p that has room for link headers */
darran	0:55a05330f8cc	178	p = r;
darran	0:55a05330f8cc	179	} else {
darran	0:55a05330f8cc	180	/* restore p->payload to point to icmp header */
darran	0:55a05330f8cc	181	if (pbuf_header(p, -(s16_t)(PBUF_IP_HLEN + PBUF_LINK_HLEN))) {
darran	0:55a05330f8cc	182	LWIP_ASSERT("icmp_input: restoring original p->payload failed\n", 0);
darran	0:55a05330f8cc	183	goto memerr;
darran	0:55a05330f8cc	184	}
darran	0:55a05330f8cc	185	}
darran	0:55a05330f8cc	186	#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
darran	0:55a05330f8cc	187	/* At this point, all checks are OK. */
darran	0:55a05330f8cc	188	/* We generate an answer by switching the dest and src ip addresses,
darran	0:55a05330f8cc	189	* setting the icmp type to ECHO_RESPONSE and updating the checksum. */
darran	0:55a05330f8cc	190	iecho = (struct icmp_echo_hdr *)p->payload;
darran	0:55a05330f8cc	191	ip_addr_copy(tmpaddr, iphdr->src);
darran	0:55a05330f8cc	192	ip_addr_copy(iphdr->src, iphdr->dest);
darran	0:55a05330f8cc	193	ip_addr_copy(iphdr->dest, tmpaddr);
darran	0:55a05330f8cc	194	ICMPH_TYPE_SET(iecho, ICMP_ER);
darran	0:55a05330f8cc	195	/* adjust the checksum */
darran	0:55a05330f8cc	196	if (iecho->chksum >= htons(0xffff - (ICMP_ECHO << 8))) {
darran	0:55a05330f8cc	197	iecho->chksum += htons(ICMP_ECHO << 8) + 1;
darran	0:55a05330f8cc	198	} else {
darran	0:55a05330f8cc	199	iecho->chksum += htons(ICMP_ECHO << 8);
darran	0:55a05330f8cc	200	}
darran	0:55a05330f8cc	201
darran	0:55a05330f8cc	202	/* Set the correct TTL and recalculate the header checksum. */
darran	0:55a05330f8cc	203	IPH_TTL_SET(iphdr, ICMP_TTL);
darran	0:55a05330f8cc	204	IPH_CHKSUM_SET(iphdr, 0);
darran	0:55a05330f8cc	205	#if CHECKSUM_GEN_IP
darran	0:55a05330f8cc	206	IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, IP_HLEN));
darran	0:55a05330f8cc	207	#endif /* CHECKSUM_GEN_IP */
darran	0:55a05330f8cc	208
darran	0:55a05330f8cc	209	ICMP_STATS_INC(icmp.xmit);
darran	0:55a05330f8cc	210	/* increase number of messages attempted to send */
darran	0:55a05330f8cc	211	snmp_inc_icmpoutmsgs();
darran	0:55a05330f8cc	212	/* increase number of echo replies attempted to send */
darran	0:55a05330f8cc	213	snmp_inc_icmpoutechoreps();
darran	0:55a05330f8cc	214
darran	0:55a05330f8cc	215	if(pbuf_header(p, hlen)) {
darran	0:55a05330f8cc	216	LWIP_ASSERT("Can't move over header in packet", 0);
darran	0:55a05330f8cc	217	} else {
darran	0:55a05330f8cc	218	err_t ret;
darran	0:55a05330f8cc	219	ret = ip_output_if(p, &(iphdr->src), IP_HDRINCL,
darran	0:55a05330f8cc	220	ICMP_TTL, 0, IP_PROTO_ICMP, inp);
darran	0:55a05330f8cc	221	if (ret != ERR_OK) {
darran	0:55a05330f8cc	222	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ip_output_if returned an error: %c.\n", ret));
darran	0:55a05330f8cc	223	}
darran	0:55a05330f8cc	224	}
darran	0:55a05330f8cc	225	break;
darran	0:55a05330f8cc	226	default:
darran	0:55a05330f8cc	227	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ICMP type %"S16_F" code %"S16_F" not supported.\n",
darran	0:55a05330f8cc	228	(s16_t)type, (s16_t)code));
darran	0:55a05330f8cc	229	ICMP_STATS_INC(icmp.proterr);
darran	0:55a05330f8cc	230	ICMP_STATS_INC(icmp.drop);
darran	0:55a05330f8cc	231	}
darran	0:55a05330f8cc	232	pbuf_free(p);
darran	0:55a05330f8cc	233	return;
darran	0:55a05330f8cc	234	lenerr:
darran	0:55a05330f8cc	235	pbuf_free(p);
darran	0:55a05330f8cc	236	ICMP_STATS_INC(icmp.lenerr);
darran	0:55a05330f8cc	237	snmp_inc_icmpinerrors();
darran	0:55a05330f8cc	238	return;
darran	0:55a05330f8cc	239	#if LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
darran	0:55a05330f8cc	240	memerr:
darran	0:55a05330f8cc	241	pbuf_free(p);
darran	0:55a05330f8cc	242	ICMP_STATS_INC(icmp.err);
darran	0:55a05330f8cc	243	snmp_inc_icmpinerrors();
darran	0:55a05330f8cc	244	return;
darran	0:55a05330f8cc	245	#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
darran	0:55a05330f8cc	246	}
darran	0:55a05330f8cc	247
darran	0:55a05330f8cc	248	/**
darran	0:55a05330f8cc	249	* Send an icmp 'destination unreachable' packet, called from ip_input() if
darran	0:55a05330f8cc	250	* the transport layer protocol is unknown and from udp_input() if the local
darran	0:55a05330f8cc	251	* port is not bound.
darran	0:55a05330f8cc	252	*
darran	0:55a05330f8cc	253	* @param p the input packet for which the 'unreachable' should be sent,
darran	0:55a05330f8cc	254	* p->payload pointing to the IP header
darran	0:55a05330f8cc	255	* @param t type of the 'unreachable' packet
darran	0:55a05330f8cc	256	*/
darran	0:55a05330f8cc	257	void
darran	0:55a05330f8cc	258	icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t)
darran	0:55a05330f8cc	259	{
darran	0:55a05330f8cc	260	icmp_send_response(p, ICMP_DUR, t);
darran	0:55a05330f8cc	261	}
darran	0:55a05330f8cc	262
darran	0:55a05330f8cc	263	#if IP_FORWARD \|\| IP_REASSEMBLY
darran	0:55a05330f8cc	264	/**
darran	0:55a05330f8cc	265	* Send a 'time exceeded' packet, called from ip_forward() if TTL is 0.
darran	0:55a05330f8cc	266	*
darran	0:55a05330f8cc	267	* @param p the input packet for which the 'time exceeded' should be sent,
darran	0:55a05330f8cc	268	* p->payload pointing to the IP header
darran	0:55a05330f8cc	269	* @param t type of the 'time exceeded' packet
darran	0:55a05330f8cc	270	*/
darran	0:55a05330f8cc	271	void
darran	0:55a05330f8cc	272	icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t)
darran	0:55a05330f8cc	273	{
darran	0:55a05330f8cc	274	icmp_send_response(p, ICMP_TE, t);
darran	0:55a05330f8cc	275	}
darran	0:55a05330f8cc	276
darran	0:55a05330f8cc	277	#endif /* IP_FORWARD \|\| IP_REASSEMBLY */
darran	0:55a05330f8cc	278
darran	0:55a05330f8cc	279	/**
darran	0:55a05330f8cc	280	* Send an icmp packet in response to an incoming packet.
darran	0:55a05330f8cc	281	*
darran	0:55a05330f8cc	282	* @param p the input packet for which the 'unreachable' should be sent,
darran	0:55a05330f8cc	283	* p->payload pointing to the IP header
darran	0:55a05330f8cc	284	* @param type Type of the ICMP header
darran	0:55a05330f8cc	285	* @param code Code of the ICMP header
darran	0:55a05330f8cc	286	*/
darran	0:55a05330f8cc	287	static void
darran	0:55a05330f8cc	288	icmp_send_response(struct pbuf *p, u8_t type, u8_t code)
darran	0:55a05330f8cc	289	{
darran	0:55a05330f8cc	290	struct pbuf *q;
darran	0:55a05330f8cc	291	struct ip_hdr *iphdr;
darran	0:55a05330f8cc	292	/* we can use the echo header here */
darran	0:55a05330f8cc	293	struct icmp_echo_hdr *icmphdr;
darran	0:55a05330f8cc	294
darran	0:55a05330f8cc	295	/* ICMP header + IP header + 8 bytes of data */
darran	0:55a05330f8cc	296	q = pbuf_alloc(PBUF_IP, sizeof(struct icmp_echo_hdr) + IP_HLEN + ICMP_DEST_UNREACH_DATASIZE,
darran	0:55a05330f8cc	297	PBUF_RAM);
darran	0:55a05330f8cc	298	if (q == NULL) {
darran	0:55a05330f8cc	299	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded: failed to allocate pbuf for ICMP packet.\n"));
darran	0:55a05330f8cc	300	return;
darran	0:55a05330f8cc	301	}
darran	0:55a05330f8cc	302	LWIP_ASSERT("check that first pbuf can hold icmp message",
darran	0:55a05330f8cc	303	(q->len >= (sizeof(struct icmp_echo_hdr) + IP_HLEN + ICMP_DEST_UNREACH_DATASIZE)));
darran	0:55a05330f8cc	304
darran	0:55a05330f8cc	305	iphdr = (struct ip_hdr *)p->payload;
darran	0:55a05330f8cc	306	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded from "));
darran	0:55a05330f8cc	307	ip_addr_debug_print(ICMP_DEBUG, &(iphdr->src));
darran	0:55a05330f8cc	308	LWIP_DEBUGF(ICMP_DEBUG, (" to "));
darran	0:55a05330f8cc	309	ip_addr_debug_print(ICMP_DEBUG, &(iphdr->dest));
darran	0:55a05330f8cc	310	LWIP_DEBUGF(ICMP_DEBUG, ("\n"));
darran	0:55a05330f8cc	311
darran	0:55a05330f8cc	312	icmphdr = (struct icmp_echo_hdr *)q->payload;
darran	0:55a05330f8cc	313	icmphdr->type = type;
darran	0:55a05330f8cc	314	icmphdr->code = code;
darran	0:55a05330f8cc	315	icmphdr->id = 0;
darran	0:55a05330f8cc	316	icmphdr->seqno = 0;
darran	0:55a05330f8cc	317
darran	0:55a05330f8cc	318	/* copy fields from original packet */
darran	0:55a05330f8cc	319	SMEMCPY((u8_t )q->payload + sizeof(struct icmp_echo_hdr), (u8_t )p->payload,
darran	0:55a05330f8cc	320	IP_HLEN + ICMP_DEST_UNREACH_DATASIZE);
darran	0:55a05330f8cc	321
darran	0:55a05330f8cc	322	/* calculate checksum */
darran	0:55a05330f8cc	323	icmphdr->chksum = 0;
darran	0:55a05330f8cc	324	icmphdr->chksum = inet_chksum(icmphdr, q->len);
darran	0:55a05330f8cc	325	ICMP_STATS_INC(icmp.xmit);
darran	0:55a05330f8cc	326	/* increase number of messages attempted to send */
darran	0:55a05330f8cc	327	snmp_inc_icmpoutmsgs();
darran	0:55a05330f8cc	328	/* increase number of destination unreachable messages attempted to send */
darran	0:55a05330f8cc	329	snmp_inc_icmpouttimeexcds();
darran	0:55a05330f8cc	330	ip_output(q, NULL, &(iphdr->src), ICMP_TTL, 0, IP_PROTO_ICMP);
darran	0:55a05330f8cc	331	pbuf_free(q);
darran	0:55a05330f8cc	332	}
darran	0:55a05330f8cc	333
darran	0:55a05330f8cc	334	#endif /* LWIP_ICMP */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	18 Jun 2010
Imports:	7
Forks:	0
Commits:	2
Dependents:	0
Dependencies:	1
Followers:	1

lwip/core/ipv4/icmp.c@1:4218cacaf696, 2010-06-18 (annotated)

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