NetServicesProxy - A modified version of http://mbed.org/users/segun…

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A modified version of http://mbed.org/users/segundo/libraries/NetServices/ljhqix to add HTTP proxy feature (based on http://mbed.org/users/igorsk/programs/NetServicesSource/ltjpag)

Dependents: SenseClient

lwip/core/ipv4/icmp.c@0:308f83189a3f, 2011-09-06 (annotated)

Committer:: mimil
Date:: Tue Sep 06 13:26:45 2011 +0000
Revision:: 0:308f83189a3f

Who changed what in which revision?

User	Revision	Line number	New contents of line
mimil	0:308f83189a3f	1	/**
mimil	0:308f83189a3f	2	* @file
mimil	0:308f83189a3f	3	* ICMP - Internet Control Message Protocol
mimil	0:308f83189a3f	4	*
mimil	0:308f83189a3f	5	*/
mimil	0:308f83189a3f	6
mimil	0:308f83189a3f	7	/*
mimil	0:308f83189a3f	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
mimil	0:308f83189a3f	9	* All rights reserved.
mimil	0:308f83189a3f	10	*
mimil	0:308f83189a3f	11	* Redistribution and use in source and binary forms, with or without modification,
mimil	0:308f83189a3f	12	* are permitted provided that the following conditions are met:
mimil	0:308f83189a3f	13	*
mimil	0:308f83189a3f	14	* 1. Redistributions of source code must retain the above copyright notice,
mimil	0:308f83189a3f	15	* this list of conditions and the following disclaimer.
mimil	0:308f83189a3f	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
mimil	0:308f83189a3f	17	* this list of conditions and the following disclaimer in the documentation
mimil	0:308f83189a3f	18	* and/or other materials provided with the distribution.
mimil	0:308f83189a3f	19	* 3. The name of the author may not be used to endorse or promote products
mimil	0:308f83189a3f	20	* derived from this software without specific prior written permission.
mimil	0:308f83189a3f	21	*
mimil	0:308f83189a3f	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
mimil	0:308f83189a3f	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
mimil	0:308f83189a3f	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
mimil	0:308f83189a3f	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
mimil	0:308f83189a3f	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
mimil	0:308f83189a3f	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mimil	0:308f83189a3f	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mimil	0:308f83189a3f	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
mimil	0:308f83189a3f	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
mimil	0:308f83189a3f	31	* OF SUCH DAMAGE.
mimil	0:308f83189a3f	32	*
mimil	0:308f83189a3f	33	* This file is part of the lwIP TCP/IP stack.
mimil	0:308f83189a3f	34	*
mimil	0:308f83189a3f	35	* Author: Adam Dunkels <adam@sics.se>
mimil	0:308f83189a3f	36	*
mimil	0:308f83189a3f	37	*/
mimil	0:308f83189a3f	38
mimil	0:308f83189a3f	39	/* Some ICMP messages should be passed to the transport protocols. This
mimil	0:308f83189a3f	40	is not implemented. */
mimil	0:308f83189a3f	41
mimil	0:308f83189a3f	42	#include "lwip/opt.h"
mimil	0:308f83189a3f	43
mimil	0:308f83189a3f	44	#if LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
mimil	0:308f83189a3f	45
mimil	0:308f83189a3f	46	#include "lwip/icmp.h"
mimil	0:308f83189a3f	47	#include "lwip/inet_chksum.h"
mimil	0:308f83189a3f	48	#include "lwip/ip.h"
mimil	0:308f83189a3f	49	#include "lwip/def.h"
mimil	0:308f83189a3f	50	#include "lwip/stats.h"
mimil	0:308f83189a3f	51	#include "lwip/snmp.h"
mimil	0:308f83189a3f	52
mimil	0:308f83189a3f	53	#include <string.h>
mimil	0:308f83189a3f	54
mimil	0:308f83189a3f	55	/** Small optimization: set to 0 if incoming PBUF_POOL pbuf always can be
mimil	0:308f83189a3f	56	* used to modify and send a response packet (and to 1 if this is not the case,
mimil	0:308f83189a3f	57	* e.g. when link header is stripped of when receiving) */
mimil	0:308f83189a3f	58	#ifndef LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
mimil	0:308f83189a3f	59	#define LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN 1
mimil	0:308f83189a3f	60	#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
mimil	0:308f83189a3f	61
mimil	0:308f83189a3f	62	/* The amount of data from the original packet to return in a dest-unreachable */
mimil	0:308f83189a3f	63	#define ICMP_DEST_UNREACH_DATASIZE 8
mimil	0:308f83189a3f	64
mimil	0:308f83189a3f	65	static void icmp_send_response(struct pbuf *p, u8_t type, u8_t code);
mimil	0:308f83189a3f	66
mimil	0:308f83189a3f	67	/**
mimil	0:308f83189a3f	68	* Processes ICMP input packets, called from ip_input().
mimil	0:308f83189a3f	69	*
mimil	0:308f83189a3f	70	* Currently only processes icmp echo requests and sends
mimil	0:308f83189a3f	71	* out the echo response.
mimil	0:308f83189a3f	72	*
mimil	0:308f83189a3f	73	* @param p the icmp echo request packet, p->payload pointing to the ip header
mimil	0:308f83189a3f	74	* @param inp the netif on which this packet was received
mimil	0:308f83189a3f	75	*/
mimil	0:308f83189a3f	76	void
mimil	0:308f83189a3f	77	icmp_input(struct pbuf p, struct netif inp)
mimil	0:308f83189a3f	78	{
mimil	0:308f83189a3f	79	u8_t type;
mimil	0:308f83189a3f	80	#ifdef LWIP_DEBUG
mimil	0:308f83189a3f	81	u8_t code;
mimil	0:308f83189a3f	82	#endif /* LWIP_DEBUG */
mimil	0:308f83189a3f	83	struct icmp_echo_hdr *iecho;
mimil	0:308f83189a3f	84	struct ip_hdr *iphdr;
mimil	0:308f83189a3f	85	s16_t hlen;
mimil	0:308f83189a3f	86
mimil	0:308f83189a3f	87	ICMP_STATS_INC(icmp.recv);
mimil	0:308f83189a3f	88	snmp_inc_icmpinmsgs();
mimil	0:308f83189a3f	89
mimil	0:308f83189a3f	90
mimil	0:308f83189a3f	91	iphdr = (struct ip_hdr *)p->payload;
mimil	0:308f83189a3f	92	hlen = IPH_HL(iphdr) * 4;
mimil	0:308f83189a3f	93	if (pbuf_header(p, -hlen) \|\| (p->tot_len < sizeof(u16_t)*2)) {
mimil	0:308f83189a3f	94	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: short ICMP (%"U16_F" bytes) received\n", p->tot_len));
mimil	0:308f83189a3f	95	goto lenerr;
mimil	0:308f83189a3f	96	}
mimil	0:308f83189a3f	97
mimil	0:308f83189a3f	98	type = ((u8_t )p->payload);
mimil	0:308f83189a3f	99	#ifdef LWIP_DEBUG
mimil	0:308f83189a3f	100	code = (((u8_t )p->payload)+1);
mimil	0:308f83189a3f	101	#endif /* LWIP_DEBUG */
mimil	0:308f83189a3f	102	switch (type) {
mimil	0:308f83189a3f	103	case ICMP_ER:
mimil	0:308f83189a3f	104	/* This is OK, echo reply might have been parsed by a raw PCB
mimil	0:308f83189a3f	105	(as obviously, an echo request has been sent, too). */
mimil	0:308f83189a3f	106	break;
mimil	0:308f83189a3f	107	case ICMP_ECHO:
mimil	0:308f83189a3f	108	#if !LWIP_MULTICAST_PING \|\| !LWIP_BROADCAST_PING
mimil	0:308f83189a3f	109	{
mimil	0:308f83189a3f	110	int accepted = 1;
mimil	0:308f83189a3f	111	#if !LWIP_MULTICAST_PING
mimil	0:308f83189a3f	112	/* multicast destination address? */
mimil	0:308f83189a3f	113	if (ip_addr_ismulticast(&current_iphdr_dest)) {
mimil	0:308f83189a3f	114	accepted = 0;
mimil	0:308f83189a3f	115	}
mimil	0:308f83189a3f	116	#endif /* LWIP_MULTICAST_PING */
mimil	0:308f83189a3f	117	#if !LWIP_BROADCAST_PING
mimil	0:308f83189a3f	118	/* broadcast destination address? */
mimil	0:308f83189a3f	119	if (ip_addr_isbroadcast(&current_iphdr_dest, inp)) {
mimil	0:308f83189a3f	120	accepted = 0;
mimil	0:308f83189a3f	121	}
mimil	0:308f83189a3f	122	#endif /* LWIP_BROADCAST_PING */
mimil	0:308f83189a3f	123	/* broadcast or multicast destination address not acceptd? */
mimil	0:308f83189a3f	124	if (!accepted) {
mimil	0:308f83189a3f	125	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: Not echoing to multicast or broadcast pings\n"));
mimil	0:308f83189a3f	126	ICMP_STATS_INC(icmp.err);
mimil	0:308f83189a3f	127	pbuf_free(p);
mimil	0:308f83189a3f	128	return;
mimil	0:308f83189a3f	129	}
mimil	0:308f83189a3f	130	}
mimil	0:308f83189a3f	131	#endif /* !LWIP_MULTICAST_PING \|\| !LWIP_BROADCAST_PING */
mimil	0:308f83189a3f	132	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ping\n"));
mimil	0:308f83189a3f	133	if (p->tot_len < sizeof(struct icmp_echo_hdr)) {
mimil	0:308f83189a3f	134	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: bad ICMP echo received\n"));
mimil	0:308f83189a3f	135	goto lenerr;
mimil	0:308f83189a3f	136	}
mimil	0:308f83189a3f	137	if (inet_chksum_pbuf(p) != 0) {
mimil	0:308f83189a3f	138	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: checksum failed for received ICMP echo\n"));
mimil	0:308f83189a3f	139	pbuf_free(p);
mimil	0:308f83189a3f	140	ICMP_STATS_INC(icmp.chkerr);
mimil	0:308f83189a3f	141	snmp_inc_icmpinerrors();
mimil	0:308f83189a3f	142	return;
mimil	0:308f83189a3f	143	}
mimil	0:308f83189a3f	144	#if LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
mimil	0:308f83189a3f	145	if (pbuf_header(p, (PBUF_IP_HLEN + PBUF_LINK_HLEN))) {
mimil	0:308f83189a3f	146	/* p is not big enough to contain link headers
mimil	0:308f83189a3f	147	* allocate a new one and copy p into it
mimil	0:308f83189a3f	148	*/
mimil	0:308f83189a3f	149	struct pbuf *r;
mimil	0:308f83189a3f	150	/* switch p->payload to ip header */
mimil	0:308f83189a3f	151	if (pbuf_header(p, hlen)) {
mimil	0:308f83189a3f	152	LWIP_ASSERT("icmp_input: moving p->payload to ip header failed\n", 0);
mimil	0:308f83189a3f	153	goto memerr;
mimil	0:308f83189a3f	154	}
mimil	0:308f83189a3f	155	/* allocate new packet buffer with space for link headers */
mimil	0:308f83189a3f	156	r = pbuf_alloc(PBUF_LINK, p->tot_len, PBUF_RAM);
mimil	0:308f83189a3f	157	if (r == NULL) {
mimil	0:308f83189a3f	158	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: allocating new pbuf failed\n"));
mimil	0:308f83189a3f	159	goto memerr;
mimil	0:308f83189a3f	160	}
mimil	0:308f83189a3f	161	LWIP_ASSERT("check that first pbuf can hold struct the ICMP header",
mimil	0:308f83189a3f	162	(r->len >= hlen + sizeof(struct icmp_echo_hdr)));
mimil	0:308f83189a3f	163	/* copy the whole packet including ip header */
mimil	0:308f83189a3f	164	if (pbuf_copy(r, p) != ERR_OK) {
mimil	0:308f83189a3f	165	LWIP_ASSERT("icmp_input: copying to new pbuf failed\n", 0);
mimil	0:308f83189a3f	166	goto memerr;
mimil	0:308f83189a3f	167	}
mimil	0:308f83189a3f	168	iphdr = (struct ip_hdr *)r->payload;
mimil	0:308f83189a3f	169	/* switch r->payload back to icmp header */
mimil	0:308f83189a3f	170	if (pbuf_header(r, -hlen)) {
mimil	0:308f83189a3f	171	LWIP_ASSERT("icmp_input: restoring original p->payload failed\n", 0);
mimil	0:308f83189a3f	172	goto memerr;
mimil	0:308f83189a3f	173	}
mimil	0:308f83189a3f	174	/* free the original p */
mimil	0:308f83189a3f	175	pbuf_free(p);
mimil	0:308f83189a3f	176	/* we now have an identical copy of p that has room for link headers */
mimil	0:308f83189a3f	177	p = r;
mimil	0:308f83189a3f	178	} else {
mimil	0:308f83189a3f	179	/* restore p->payload to point to icmp header */
mimil	0:308f83189a3f	180	if (pbuf_header(p, -(s16_t)(PBUF_IP_HLEN + PBUF_LINK_HLEN))) {
mimil	0:308f83189a3f	181	LWIP_ASSERT("icmp_input: restoring original p->payload failed\n", 0);
mimil	0:308f83189a3f	182	goto memerr;
mimil	0:308f83189a3f	183	}
mimil	0:308f83189a3f	184	}
mimil	0:308f83189a3f	185	#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
mimil	0:308f83189a3f	186	/* At this point, all checks are OK. */
mimil	0:308f83189a3f	187	/* We generate an answer by switching the dest and src ip addresses,
mimil	0:308f83189a3f	188	* setting the icmp type to ECHO_RESPONSE and updating the checksum. */
mimil	0:308f83189a3f	189	iecho = (struct icmp_echo_hdr *)p->payload;
mimil	0:308f83189a3f	190	ip_addr_copy(iphdr->src, *ip_current_dest_addr());
mimil	0:308f83189a3f	191	ip_addr_copy(iphdr->dest, *ip_current_src_addr());
mimil	0:308f83189a3f	192	ICMPH_TYPE_SET(iecho, ICMP_ER);
mimil	0:308f83189a3f	193	/* adjust the checksum */
mimil	0:308f83189a3f	194	if (iecho->chksum >= PP_HTONS(0xffff - (ICMP_ECHO << 8))) {
mimil	0:308f83189a3f	195	iecho->chksum += PP_HTONS(ICMP_ECHO << 8) + 1;
mimil	0:308f83189a3f	196	} else {
mimil	0:308f83189a3f	197	iecho->chksum += PP_HTONS(ICMP_ECHO << 8);
mimil	0:308f83189a3f	198	}
mimil	0:308f83189a3f	199
mimil	0:308f83189a3f	200	/* Set the correct TTL and recalculate the header checksum. */
mimil	0:308f83189a3f	201	IPH_TTL_SET(iphdr, ICMP_TTL);
mimil	0:308f83189a3f	202	IPH_CHKSUM_SET(iphdr, 0);
mimil	0:308f83189a3f	203	#if CHECKSUM_GEN_IP
mimil	0:308f83189a3f	204	IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, IP_HLEN));
mimil	0:308f83189a3f	205	#endif /* CHECKSUM_GEN_IP */
mimil	0:308f83189a3f	206
mimil	0:308f83189a3f	207	ICMP_STATS_INC(icmp.xmit);
mimil	0:308f83189a3f	208	/* increase number of messages attempted to send */
mimil	0:308f83189a3f	209	snmp_inc_icmpoutmsgs();
mimil	0:308f83189a3f	210	/* increase number of echo replies attempted to send */
mimil	0:308f83189a3f	211	snmp_inc_icmpoutechoreps();
mimil	0:308f83189a3f	212
mimil	0:308f83189a3f	213	if(pbuf_header(p, hlen)) {
mimil	0:308f83189a3f	214	LWIP_ASSERT("Can't move over header in packet", 0);
mimil	0:308f83189a3f	215	} else {
mimil	0:308f83189a3f	216	err_t ret;
mimil	0:308f83189a3f	217	/* send an ICMP packet, src addr is the dest addr of the curren packet */
mimil	0:308f83189a3f	218	ret = ip_output_if(p, ip_current_dest_addr(), IP_HDRINCL,
mimil	0:308f83189a3f	219	ICMP_TTL, 0, IP_PROTO_ICMP, inp);
mimil	0:308f83189a3f	220	if (ret != ERR_OK) {
mimil	0:308f83189a3f	221	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ip_output_if returned an error: %c.\n", ret));
mimil	0:308f83189a3f	222	}
mimil	0:308f83189a3f	223	}
mimil	0:308f83189a3f	224	break;
mimil	0:308f83189a3f	225	default:
mimil	0:308f83189a3f	226	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ICMP type %"S16_F" code %"S16_F" not supported.\n",
mimil	0:308f83189a3f	227	(s16_t)type, (s16_t)code));
mimil	0:308f83189a3f	228	ICMP_STATS_INC(icmp.proterr);
mimil	0:308f83189a3f	229	ICMP_STATS_INC(icmp.drop);
mimil	0:308f83189a3f	230	}
mimil	0:308f83189a3f	231	pbuf_free(p);
mimil	0:308f83189a3f	232	return;
mimil	0:308f83189a3f	233	lenerr:
mimil	0:308f83189a3f	234	pbuf_free(p);
mimil	0:308f83189a3f	235	ICMP_STATS_INC(icmp.lenerr);
mimil	0:308f83189a3f	236	snmp_inc_icmpinerrors();
mimil	0:308f83189a3f	237	return;
mimil	0:308f83189a3f	238	#if LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
mimil	0:308f83189a3f	239	memerr:
mimil	0:308f83189a3f	240	pbuf_free(p);
mimil	0:308f83189a3f	241	ICMP_STATS_INC(icmp.err);
mimil	0:308f83189a3f	242	snmp_inc_icmpinerrors();
mimil	0:308f83189a3f	243	return;
mimil	0:308f83189a3f	244	#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
mimil	0:308f83189a3f	245	}
mimil	0:308f83189a3f	246
mimil	0:308f83189a3f	247	/**
mimil	0:308f83189a3f	248	* Send an icmp 'destination unreachable' packet, called from ip_input() if
mimil	0:308f83189a3f	249	* the transport layer protocol is unknown and from udp_input() if the local
mimil	0:308f83189a3f	250	* port is not bound.
mimil	0:308f83189a3f	251	*
mimil	0:308f83189a3f	252	* @param p the input packet for which the 'unreachable' should be sent,
mimil	0:308f83189a3f	253	* p->payload pointing to the IP header
mimil	0:308f83189a3f	254	* @param t type of the 'unreachable' packet
mimil	0:308f83189a3f	255	*/
mimil	0:308f83189a3f	256	void
mimil	0:308f83189a3f	257	icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t)
mimil	0:308f83189a3f	258	{
mimil	0:308f83189a3f	259	icmp_send_response(p, ICMP_DUR, t);
mimil	0:308f83189a3f	260	}
mimil	0:308f83189a3f	261
mimil	0:308f83189a3f	262	#if IP_FORWARD \|\| IP_REASSEMBLY
mimil	0:308f83189a3f	263	/**
mimil	0:308f83189a3f	264	* Send a 'time exceeded' packet, called from ip_forward() if TTL is 0.
mimil	0:308f83189a3f	265	*
mimil	0:308f83189a3f	266	* @param p the input packet for which the 'time exceeded' should be sent,
mimil	0:308f83189a3f	267	* p->payload pointing to the IP header
mimil	0:308f83189a3f	268	* @param t type of the 'time exceeded' packet
mimil	0:308f83189a3f	269	*/
mimil	0:308f83189a3f	270	void
mimil	0:308f83189a3f	271	icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t)
mimil	0:308f83189a3f	272	{
mimil	0:308f83189a3f	273	icmp_send_response(p, ICMP_TE, t);
mimil	0:308f83189a3f	274	}
mimil	0:308f83189a3f	275
mimil	0:308f83189a3f	276	#endif /* IP_FORWARD \|\| IP_REASSEMBLY */
mimil	0:308f83189a3f	277
mimil	0:308f83189a3f	278	/**
mimil	0:308f83189a3f	279	* Send an icmp packet in response to an incoming packet.
mimil	0:308f83189a3f	280	*
mimil	0:308f83189a3f	281	* @param p the input packet for which the 'unreachable' should be sent,
mimil	0:308f83189a3f	282	* p->payload pointing to the IP header
mimil	0:308f83189a3f	283	* @param type Type of the ICMP header
mimil	0:308f83189a3f	284	* @param code Code of the ICMP header
mimil	0:308f83189a3f	285	*/
mimil	0:308f83189a3f	286	static void
mimil	0:308f83189a3f	287	icmp_send_response(struct pbuf *p, u8_t type, u8_t code)
mimil	0:308f83189a3f	288	{
mimil	0:308f83189a3f	289	struct pbuf *q;
mimil	0:308f83189a3f	290	struct ip_hdr *iphdr;
mimil	0:308f83189a3f	291	/* we can use the echo header here */
mimil	0:308f83189a3f	292	struct icmp_echo_hdr *icmphdr;
mimil	0:308f83189a3f	293	ip_addr_t iphdr_src;
mimil	0:308f83189a3f	294
mimil	0:308f83189a3f	295	/* ICMP header + IP header + 8 bytes of data */
mimil	0:308f83189a3f	296	q = pbuf_alloc(PBUF_IP, sizeof(struct icmp_echo_hdr) + IP_HLEN + ICMP_DEST_UNREACH_DATASIZE,
mimil	0:308f83189a3f	297	PBUF_RAM);
mimil	0:308f83189a3f	298	if (q == NULL) {
mimil	0:308f83189a3f	299	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded: failed to allocate pbuf for ICMP packet.\n"));
mimil	0:308f83189a3f	300	return;
mimil	0:308f83189a3f	301	}
mimil	0:308f83189a3f	302	LWIP_ASSERT("check that first pbuf can hold icmp message",
mimil	0:308f83189a3f	303	(q->len >= (sizeof(struct icmp_echo_hdr) + IP_HLEN + ICMP_DEST_UNREACH_DATASIZE)));
mimil	0:308f83189a3f	304
mimil	0:308f83189a3f	305	iphdr = (struct ip_hdr *)p->payload;
mimil	0:308f83189a3f	306	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded from "));
mimil	0:308f83189a3f	307	ip_addr_debug_print(ICMP_DEBUG, &(iphdr->src));
mimil	0:308f83189a3f	308	LWIP_DEBUGF(ICMP_DEBUG, (" to "));
mimil	0:308f83189a3f	309	ip_addr_debug_print(ICMP_DEBUG, &(iphdr->dest));
mimil	0:308f83189a3f	310	LWIP_DEBUGF(ICMP_DEBUG, ("\n"));
mimil	0:308f83189a3f	311
mimil	0:308f83189a3f	312	icmphdr = (struct icmp_echo_hdr *)q->payload;
mimil	0:308f83189a3f	313	icmphdr->type = type;
mimil	0:308f83189a3f	314	icmphdr->code = code;
mimil	0:308f83189a3f	315	icmphdr->id = 0;
mimil	0:308f83189a3f	316	icmphdr->seqno = 0;
mimil	0:308f83189a3f	317
mimil	0:308f83189a3f	318	/* copy fields from original packet */
mimil	0:308f83189a3f	319	SMEMCPY((u8_t )q->payload + sizeof(struct icmp_echo_hdr), (u8_t )p->payload,
mimil	0:308f83189a3f	320	IP_HLEN + ICMP_DEST_UNREACH_DATASIZE);
mimil	0:308f83189a3f	321
mimil	0:308f83189a3f	322	/* calculate checksum */
mimil	0:308f83189a3f	323	icmphdr->chksum = 0;
mimil	0:308f83189a3f	324	icmphdr->chksum = inet_chksum(icmphdr, q->len);
mimil	0:308f83189a3f	325	ICMP_STATS_INC(icmp.xmit);
mimil	0:308f83189a3f	326	/* increase number of messages attempted to send */
mimil	0:308f83189a3f	327	snmp_inc_icmpoutmsgs();
mimil	0:308f83189a3f	328	/* increase number of destination unreachable messages attempted to send */
mimil	0:308f83189a3f	329	snmp_inc_icmpouttimeexcds();
mimil	0:308f83189a3f	330	ip_addr_copy(iphdr_src, iphdr->src);
mimil	0:308f83189a3f	331	ip_output(q, NULL, &iphdr_src, ICMP_TTL, 0, IP_PROTO_ICMP);
mimil	0:308f83189a3f	332	pbuf_free(q);
mimil	0:308f83189a3f	333	}
mimil	0:308f83189a3f	334
mimil	0:308f83189a3f	335	#endif /* LWIP_ICMP */

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Type:	Library
Created:	06 Sep 2011
Imports:	40
Forks:	0
Commits:	1
Dependents:	1
Dependencies:	0
Followers:	1

lwip/core/ipv4/icmp.c@0:308f83189a3f, 2011-09-06 (annotated)

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