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Jesper Taxbøl / Mbed 2 deprecated TCPSpeedTest

I have a problem getting this to work. Server only recieves half of the data being sent. Whats wrong

lwip/core/ipv4/icmp.c@0:66300c77c6e9, 2011-03-29 (annotated)

Committer:: tax
Date:: Tue Mar 29 13:20:15 2011 +0000
Revision:: 0:66300c77c6e9

Who changed what in which revision?

User	Revision	Line number	New contents of line
tax	0:66300c77c6e9	1	/**
tax	0:66300c77c6e9	2	* @file
tax	0:66300c77c6e9	3	* ICMP - Internet Control Message Protocol
tax	0:66300c77c6e9	4	*
tax	0:66300c77c6e9	5	*/
tax	0:66300c77c6e9	6
tax	0:66300c77c6e9	7	/*
tax	0:66300c77c6e9	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
tax	0:66300c77c6e9	9	* All rights reserved.
tax	0:66300c77c6e9	10	*
tax	0:66300c77c6e9	11	* Redistribution and use in source and binary forms, with or without modification,
tax	0:66300c77c6e9	12	* are permitted provided that the following conditions are met:
tax	0:66300c77c6e9	13	*
tax	0:66300c77c6e9	14	* 1. Redistributions of source code must retain the above copyright notice,
tax	0:66300c77c6e9	15	* this list of conditions and the following disclaimer.
tax	0:66300c77c6e9	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
tax	0:66300c77c6e9	17	* this list of conditions and the following disclaimer in the documentation
tax	0:66300c77c6e9	18	* and/or other materials provided with the distribution.
tax	0:66300c77c6e9	19	* 3. The name of the author may not be used to endorse or promote products
tax	0:66300c77c6e9	20	* derived from this software without specific prior written permission.
tax	0:66300c77c6e9	21	*
tax	0:66300c77c6e9	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
tax	0:66300c77c6e9	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
tax	0:66300c77c6e9	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
tax	0:66300c77c6e9	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
tax	0:66300c77c6e9	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
tax	0:66300c77c6e9	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
tax	0:66300c77c6e9	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
tax	0:66300c77c6e9	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
tax	0:66300c77c6e9	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
tax	0:66300c77c6e9	31	* OF SUCH DAMAGE.
tax	0:66300c77c6e9	32	*
tax	0:66300c77c6e9	33	* This file is part of the lwIP TCP/IP stack.
tax	0:66300c77c6e9	34	*
tax	0:66300c77c6e9	35	* Author: Adam Dunkels <adam@sics.se>
tax	0:66300c77c6e9	36	*
tax	0:66300c77c6e9	37	*/
tax	0:66300c77c6e9	38
tax	0:66300c77c6e9	39	/* Some ICMP messages should be passed to the transport protocols. This
tax	0:66300c77c6e9	40	is not implemented. */
tax	0:66300c77c6e9	41
tax	0:66300c77c6e9	42	#include "lwip/opt.h"
tax	0:66300c77c6e9	43
tax	0:66300c77c6e9	44	#if LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
tax	0:66300c77c6e9	45
tax	0:66300c77c6e9	46	#include "lwip/icmp.h"
tax	0:66300c77c6e9	47	#include "lwip/inet_chksum.h"
tax	0:66300c77c6e9	48	#include "lwip/ip.h"
tax	0:66300c77c6e9	49	#include "lwip/def.h"
tax	0:66300c77c6e9	50	#include "lwip/stats.h"
tax	0:66300c77c6e9	51	#include "lwip/snmp.h"
tax	0:66300c77c6e9	52
tax	0:66300c77c6e9	53	#include <string.h>
tax	0:66300c77c6e9	54
tax	0:66300c77c6e9	55	/** Small optimization: set to 0 if incoming PBUF_POOL pbuf always can be
tax	0:66300c77c6e9	56	* used to modify and send a response packet (and to 1 if this is not the case,
tax	0:66300c77c6e9	57	* e.g. when link header is stripped of when receiving) */
tax	0:66300c77c6e9	58	#ifndef LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
tax	0:66300c77c6e9	59	#define LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN 1
tax	0:66300c77c6e9	60	#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
tax	0:66300c77c6e9	61
tax	0:66300c77c6e9	62	/* The amount of data from the original packet to return in a dest-unreachable */
tax	0:66300c77c6e9	63	#define ICMP_DEST_UNREACH_DATASIZE 8
tax	0:66300c77c6e9	64
tax	0:66300c77c6e9	65	static void icmp_send_response(struct pbuf *p, u8_t type, u8_t code);
tax	0:66300c77c6e9	66
tax	0:66300c77c6e9	67	/**
tax	0:66300c77c6e9	68	* Processes ICMP input packets, called from ip_input().
tax	0:66300c77c6e9	69	*
tax	0:66300c77c6e9	70	* Currently only processes icmp echo requests and sends
tax	0:66300c77c6e9	71	* out the echo response.
tax	0:66300c77c6e9	72	*
tax	0:66300c77c6e9	73	* @param p the icmp echo request packet, p->payload pointing to the ip header
tax	0:66300c77c6e9	74	* @param inp the netif on which this packet was received
tax	0:66300c77c6e9	75	*/
tax	0:66300c77c6e9	76	void
tax	0:66300c77c6e9	77	icmp_input(struct pbuf p, struct netif inp)
tax	0:66300c77c6e9	78	{
tax	0:66300c77c6e9	79	u8_t type;
tax	0:66300c77c6e9	80	#ifdef LWIP_DEBUG
tax	0:66300c77c6e9	81	u8_t code;
tax	0:66300c77c6e9	82	#endif /* LWIP_DEBUG */
tax	0:66300c77c6e9	83	struct icmp_echo_hdr *iecho;
tax	0:66300c77c6e9	84	struct ip_hdr *iphdr;
tax	0:66300c77c6e9	85	s16_t hlen;
tax	0:66300c77c6e9	86
tax	0:66300c77c6e9	87	ICMP_STATS_INC(icmp.recv);
tax	0:66300c77c6e9	88	snmp_inc_icmpinmsgs();
tax	0:66300c77c6e9	89
tax	0:66300c77c6e9	90
tax	0:66300c77c6e9	91	iphdr = (struct ip_hdr *)p->payload;
tax	0:66300c77c6e9	92	hlen = IPH_HL(iphdr) * 4;
tax	0:66300c77c6e9	93	if (pbuf_header(p, -hlen) \|\| (p->tot_len < sizeof(u16_t)*2)) {
tax	0:66300c77c6e9	94	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: short ICMP (%"U16_F" bytes) received\n", p->tot_len));
tax	0:66300c77c6e9	95	goto lenerr;
tax	0:66300c77c6e9	96	}
tax	0:66300c77c6e9	97
tax	0:66300c77c6e9	98	type = ((u8_t )p->payload);
tax	0:66300c77c6e9	99	#ifdef LWIP_DEBUG
tax	0:66300c77c6e9	100	code = (((u8_t )p->payload)+1);
tax	0:66300c77c6e9	101	#endif /* LWIP_DEBUG */
tax	0:66300c77c6e9	102	switch (type) {
tax	0:66300c77c6e9	103	case ICMP_ER:
tax	0:66300c77c6e9	104	/* This is OK, echo reply might have been parsed by a raw PCB
tax	0:66300c77c6e9	105	(as obviously, an echo request has been sent, too). */
tax	0:66300c77c6e9	106	break;
tax	0:66300c77c6e9	107	case ICMP_ECHO:
tax	0:66300c77c6e9	108	#if !LWIP_MULTICAST_PING \|\| !LWIP_BROADCAST_PING
tax	0:66300c77c6e9	109	{
tax	0:66300c77c6e9	110	int accepted = 1;
tax	0:66300c77c6e9	111	#if !LWIP_MULTICAST_PING
tax	0:66300c77c6e9	112	/* multicast destination address? */
tax	0:66300c77c6e9	113	if (ip_addr_ismulticast(&current_iphdr_dest)) {
tax	0:66300c77c6e9	114	accepted = 0;
tax	0:66300c77c6e9	115	}
tax	0:66300c77c6e9	116	#endif /* LWIP_MULTICAST_PING */
tax	0:66300c77c6e9	117	#if !LWIP_BROADCAST_PING
tax	0:66300c77c6e9	118	/* broadcast destination address? */
tax	0:66300c77c6e9	119	if (ip_addr_isbroadcast(&current_iphdr_dest, inp)) {
tax	0:66300c77c6e9	120	accepted = 0;
tax	0:66300c77c6e9	121	}
tax	0:66300c77c6e9	122	#endif /* LWIP_BROADCAST_PING */
tax	0:66300c77c6e9	123	/* broadcast or multicast destination address not acceptd? */
tax	0:66300c77c6e9	124	if (!accepted) {
tax	0:66300c77c6e9	125	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: Not echoing to multicast or broadcast pings\n"));
tax	0:66300c77c6e9	126	ICMP_STATS_INC(icmp.err);
tax	0:66300c77c6e9	127	pbuf_free(p);
tax	0:66300c77c6e9	128	return;
tax	0:66300c77c6e9	129	}
tax	0:66300c77c6e9	130	}
tax	0:66300c77c6e9	131	#endif /* !LWIP_MULTICAST_PING \|\| !LWIP_BROADCAST_PING */
tax	0:66300c77c6e9	132	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ping\n"));
tax	0:66300c77c6e9	133	if (p->tot_len < sizeof(struct icmp_echo_hdr)) {
tax	0:66300c77c6e9	134	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: bad ICMP echo received\n"));
tax	0:66300c77c6e9	135	goto lenerr;
tax	0:66300c77c6e9	136	}
tax	0:66300c77c6e9	137	if (inet_chksum_pbuf(p) != 0) {
tax	0:66300c77c6e9	138	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: checksum failed for received ICMP echo\n"));
tax	0:66300c77c6e9	139	pbuf_free(p);
tax	0:66300c77c6e9	140	ICMP_STATS_INC(icmp.chkerr);
tax	0:66300c77c6e9	141	snmp_inc_icmpinerrors();
tax	0:66300c77c6e9	142	return;
tax	0:66300c77c6e9	143	}
tax	0:66300c77c6e9	144	#if LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
tax	0:66300c77c6e9	145	if (pbuf_header(p, (PBUF_IP_HLEN + PBUF_LINK_HLEN))) {
tax	0:66300c77c6e9	146	/* p is not big enough to contain link headers
tax	0:66300c77c6e9	147	* allocate a new one and copy p into it
tax	0:66300c77c6e9	148	*/
tax	0:66300c77c6e9	149	struct pbuf *r;
tax	0:66300c77c6e9	150	/* switch p->payload to ip header */
tax	0:66300c77c6e9	151	if (pbuf_header(p, hlen)) {
tax	0:66300c77c6e9	152	LWIP_ASSERT("icmp_input: moving p->payload to ip header failed\n", 0);
tax	0:66300c77c6e9	153	goto memerr;
tax	0:66300c77c6e9	154	}
tax	0:66300c77c6e9	155	/* allocate new packet buffer with space for link headers */
tax	0:66300c77c6e9	156	r = pbuf_alloc(PBUF_LINK, p->tot_len, PBUF_RAM);
tax	0:66300c77c6e9	157	if (r == NULL) {
tax	0:66300c77c6e9	158	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: allocating new pbuf failed\n"));
tax	0:66300c77c6e9	159	goto memerr;
tax	0:66300c77c6e9	160	}
tax	0:66300c77c6e9	161	LWIP_ASSERT("check that first pbuf can hold struct the ICMP header",
tax	0:66300c77c6e9	162	(r->len >= hlen + sizeof(struct icmp_echo_hdr)));
tax	0:66300c77c6e9	163	/* copy the whole packet including ip header */
tax	0:66300c77c6e9	164	if (pbuf_copy(r, p) != ERR_OK) {
tax	0:66300c77c6e9	165	LWIP_ASSERT("icmp_input: copying to new pbuf failed\n", 0);
tax	0:66300c77c6e9	166	goto memerr;
tax	0:66300c77c6e9	167	}
tax	0:66300c77c6e9	168	iphdr = (struct ip_hdr *)r->payload;
tax	0:66300c77c6e9	169	/* switch r->payload back to icmp header */
tax	0:66300c77c6e9	170	if (pbuf_header(r, -hlen)) {
tax	0:66300c77c6e9	171	LWIP_ASSERT("icmp_input: restoring original p->payload failed\n", 0);
tax	0:66300c77c6e9	172	goto memerr;
tax	0:66300c77c6e9	173	}
tax	0:66300c77c6e9	174	/* free the original p */
tax	0:66300c77c6e9	175	pbuf_free(p);
tax	0:66300c77c6e9	176	/* we now have an identical copy of p that has room for link headers */
tax	0:66300c77c6e9	177	p = r;
tax	0:66300c77c6e9	178	} else {
tax	0:66300c77c6e9	179	/* restore p->payload to point to icmp header */
tax	0:66300c77c6e9	180	if (pbuf_header(p, -(s16_t)(PBUF_IP_HLEN + PBUF_LINK_HLEN))) {
tax	0:66300c77c6e9	181	LWIP_ASSERT("icmp_input: restoring original p->payload failed\n", 0);
tax	0:66300c77c6e9	182	goto memerr;
tax	0:66300c77c6e9	183	}
tax	0:66300c77c6e9	184	}
tax	0:66300c77c6e9	185	#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
tax	0:66300c77c6e9	186	/* At this point, all checks are OK. */
tax	0:66300c77c6e9	187	/* We generate an answer by switching the dest and src ip addresses,
tax	0:66300c77c6e9	188	* setting the icmp type to ECHO_RESPONSE and updating the checksum. */
tax	0:66300c77c6e9	189	iecho = (struct icmp_echo_hdr *)p->payload;
tax	0:66300c77c6e9	190	ip_addr_copy(iphdr->src, *ip_current_dest_addr());
tax	0:66300c77c6e9	191	ip_addr_copy(iphdr->dest, *ip_current_src_addr());
tax	0:66300c77c6e9	192	ICMPH_TYPE_SET(iecho, ICMP_ER);
tax	0:66300c77c6e9	193	/* adjust the checksum */
tax	0:66300c77c6e9	194	if (iecho->chksum >= PP_HTONS(0xffff - (ICMP_ECHO << 8))) {
tax	0:66300c77c6e9	195	iecho->chksum += PP_HTONS(ICMP_ECHO << 8) + 1;
tax	0:66300c77c6e9	196	} else {
tax	0:66300c77c6e9	197	iecho->chksum += PP_HTONS(ICMP_ECHO << 8);
tax	0:66300c77c6e9	198	}
tax	0:66300c77c6e9	199
tax	0:66300c77c6e9	200	/* Set the correct TTL and recalculate the header checksum. */
tax	0:66300c77c6e9	201	IPH_TTL_SET(iphdr, ICMP_TTL);
tax	0:66300c77c6e9	202	IPH_CHKSUM_SET(iphdr, 0);
tax	0:66300c77c6e9	203	#if CHECKSUM_GEN_IP
tax	0:66300c77c6e9	204	IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, IP_HLEN));
tax	0:66300c77c6e9	205	#endif /* CHECKSUM_GEN_IP */
tax	0:66300c77c6e9	206
tax	0:66300c77c6e9	207	ICMP_STATS_INC(icmp.xmit);
tax	0:66300c77c6e9	208	/* increase number of messages attempted to send */
tax	0:66300c77c6e9	209	snmp_inc_icmpoutmsgs();
tax	0:66300c77c6e9	210	/* increase number of echo replies attempted to send */
tax	0:66300c77c6e9	211	snmp_inc_icmpoutechoreps();
tax	0:66300c77c6e9	212
tax	0:66300c77c6e9	213	if(pbuf_header(p, hlen)) {
tax	0:66300c77c6e9	214	LWIP_ASSERT("Can't move over header in packet", 0);
tax	0:66300c77c6e9	215	} else {
tax	0:66300c77c6e9	216	err_t ret;
tax	0:66300c77c6e9	217	/* send an ICMP packet, src addr is the dest addr of the curren packet */
tax	0:66300c77c6e9	218	ret = ip_output_if(p, ip_current_dest_addr(), IP_HDRINCL,
tax	0:66300c77c6e9	219	ICMP_TTL, 0, IP_PROTO_ICMP, inp);
tax	0:66300c77c6e9	220	if (ret != ERR_OK) {
tax	0:66300c77c6e9	221	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ip_output_if returned an error: %c.\n", ret));
tax	0:66300c77c6e9	222	}
tax	0:66300c77c6e9	223	}
tax	0:66300c77c6e9	224	break;
tax	0:66300c77c6e9	225	default:
tax	0:66300c77c6e9	226	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ICMP type %"S16_F" code %"S16_F" not supported.\n",
tax	0:66300c77c6e9	227	(s16_t)type, (s16_t)code));
tax	0:66300c77c6e9	228	ICMP_STATS_INC(icmp.proterr);
tax	0:66300c77c6e9	229	ICMP_STATS_INC(icmp.drop);
tax	0:66300c77c6e9	230	}
tax	0:66300c77c6e9	231	pbuf_free(p);
tax	0:66300c77c6e9	232	return;
tax	0:66300c77c6e9	233	lenerr:
tax	0:66300c77c6e9	234	pbuf_free(p);
tax	0:66300c77c6e9	235	ICMP_STATS_INC(icmp.lenerr);
tax	0:66300c77c6e9	236	snmp_inc_icmpinerrors();
tax	0:66300c77c6e9	237	return;
tax	0:66300c77c6e9	238	#if LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
tax	0:66300c77c6e9	239	memerr:
tax	0:66300c77c6e9	240	pbuf_free(p);
tax	0:66300c77c6e9	241	ICMP_STATS_INC(icmp.err);
tax	0:66300c77c6e9	242	snmp_inc_icmpinerrors();
tax	0:66300c77c6e9	243	return;
tax	0:66300c77c6e9	244	#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
tax	0:66300c77c6e9	245	}
tax	0:66300c77c6e9	246
tax	0:66300c77c6e9	247	/**
tax	0:66300c77c6e9	248	* Send an icmp 'destination unreachable' packet, called from ip_input() if
tax	0:66300c77c6e9	249	* the transport layer protocol is unknown and from udp_input() if the local
tax	0:66300c77c6e9	250	* port is not bound.
tax	0:66300c77c6e9	251	*
tax	0:66300c77c6e9	252	* @param p the input packet for which the 'unreachable' should be sent,
tax	0:66300c77c6e9	253	* p->payload pointing to the IP header
tax	0:66300c77c6e9	254	* @param t type of the 'unreachable' packet
tax	0:66300c77c6e9	255	*/
tax	0:66300c77c6e9	256	void
tax	0:66300c77c6e9	257	icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t)
tax	0:66300c77c6e9	258	{
tax	0:66300c77c6e9	259	icmp_send_response(p, ICMP_DUR, t);
tax	0:66300c77c6e9	260	}
tax	0:66300c77c6e9	261
tax	0:66300c77c6e9	262	#if IP_FORWARD \|\| IP_REASSEMBLY
tax	0:66300c77c6e9	263	/**
tax	0:66300c77c6e9	264	* Send a 'time exceeded' packet, called from ip_forward() if TTL is 0.
tax	0:66300c77c6e9	265	*
tax	0:66300c77c6e9	266	* @param p the input packet for which the 'time exceeded' should be sent,
tax	0:66300c77c6e9	267	* p->payload pointing to the IP header
tax	0:66300c77c6e9	268	* @param t type of the 'time exceeded' packet
tax	0:66300c77c6e9	269	*/
tax	0:66300c77c6e9	270	void
tax	0:66300c77c6e9	271	icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t)
tax	0:66300c77c6e9	272	{
tax	0:66300c77c6e9	273	icmp_send_response(p, ICMP_TE, t);
tax	0:66300c77c6e9	274	}
tax	0:66300c77c6e9	275
tax	0:66300c77c6e9	276	#endif /* IP_FORWARD \|\| IP_REASSEMBLY */
tax	0:66300c77c6e9	277
tax	0:66300c77c6e9	278	/**
tax	0:66300c77c6e9	279	* Send an icmp packet in response to an incoming packet.
tax	0:66300c77c6e9	280	*
tax	0:66300c77c6e9	281	* @param p the input packet for which the 'unreachable' should be sent,
tax	0:66300c77c6e9	282	* p->payload pointing to the IP header
tax	0:66300c77c6e9	283	* @param type Type of the ICMP header
tax	0:66300c77c6e9	284	* @param code Code of the ICMP header
tax	0:66300c77c6e9	285	*/
tax	0:66300c77c6e9	286	static void
tax	0:66300c77c6e9	287	icmp_send_response(struct pbuf *p, u8_t type, u8_t code)
tax	0:66300c77c6e9	288	{
tax	0:66300c77c6e9	289	struct pbuf *q;
tax	0:66300c77c6e9	290	struct ip_hdr *iphdr;
tax	0:66300c77c6e9	291	/* we can use the echo header here */
tax	0:66300c77c6e9	292	struct icmp_echo_hdr *icmphdr;
tax	0:66300c77c6e9	293	ip_addr_t iphdr_src;
tax	0:66300c77c6e9	294
tax	0:66300c77c6e9	295	/* ICMP header + IP header + 8 bytes of data */
tax	0:66300c77c6e9	296	q = pbuf_alloc(PBUF_IP, sizeof(struct icmp_echo_hdr) + IP_HLEN + ICMP_DEST_UNREACH_DATASIZE,
tax	0:66300c77c6e9	297	PBUF_RAM);
tax	0:66300c77c6e9	298	if (q == NULL) {
tax	0:66300c77c6e9	299	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded: failed to allocate pbuf for ICMP packet.\n"));
tax	0:66300c77c6e9	300	return;
tax	0:66300c77c6e9	301	}
tax	0:66300c77c6e9	302	LWIP_ASSERT("check that first pbuf can hold icmp message",
tax	0:66300c77c6e9	303	(q->len >= (sizeof(struct icmp_echo_hdr) + IP_HLEN + ICMP_DEST_UNREACH_DATASIZE)));
tax	0:66300c77c6e9	304
tax	0:66300c77c6e9	305	iphdr = (struct ip_hdr *)p->payload;
tax	0:66300c77c6e9	306	LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded from "));
tax	0:66300c77c6e9	307	ip_addr_debug_print(ICMP_DEBUG, &(iphdr->src));
tax	0:66300c77c6e9	308	LWIP_DEBUGF(ICMP_DEBUG, (" to "));
tax	0:66300c77c6e9	309	ip_addr_debug_print(ICMP_DEBUG, &(iphdr->dest));
tax	0:66300c77c6e9	310	LWIP_DEBUGF(ICMP_DEBUG, ("\n"));
tax	0:66300c77c6e9	311
tax	0:66300c77c6e9	312	icmphdr = (struct icmp_echo_hdr *)q->payload;
tax	0:66300c77c6e9	313	icmphdr->type = type;
tax	0:66300c77c6e9	314	icmphdr->code = code;
tax	0:66300c77c6e9	315	icmphdr->id = 0;
tax	0:66300c77c6e9	316	icmphdr->seqno = 0;
tax	0:66300c77c6e9	317
tax	0:66300c77c6e9	318	/* copy fields from original packet */
tax	0:66300c77c6e9	319	SMEMCPY((u8_t )q->payload + sizeof(struct icmp_echo_hdr), (u8_t )p->payload,
tax	0:66300c77c6e9	320	IP_HLEN + ICMP_DEST_UNREACH_DATASIZE);
tax	0:66300c77c6e9	321
tax	0:66300c77c6e9	322	/* calculate checksum */
tax	0:66300c77c6e9	323	icmphdr->chksum = 0;
tax	0:66300c77c6e9	324	icmphdr->chksum = inet_chksum(icmphdr, q->len);
tax	0:66300c77c6e9	325	ICMP_STATS_INC(icmp.xmit);
tax	0:66300c77c6e9	326	/* increase number of messages attempted to send */
tax	0:66300c77c6e9	327	snmp_inc_icmpoutmsgs();
tax	0:66300c77c6e9	328	/* increase number of destination unreachable messages attempted to send */
tax	0:66300c77c6e9	329	snmp_inc_icmpouttimeexcds();
tax	0:66300c77c6e9	330	ip_addr_copy(iphdr_src, iphdr->src);
tax	0:66300c77c6e9	331	ip_output(q, NULL, &iphdr_src, ICMP_TTL, 0, IP_PROTO_ICMP);
tax	0:66300c77c6e9	332	pbuf_free(q);
tax	0:66300c77c6e9	333	}
tax	0:66300c77c6e9	334
tax	0:66300c77c6e9	335	#endif /* LWIP_ICMP */

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	29 Mar 2011
Imports:	16
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	2

lwip/core/ipv4/icmp.c@0:66300c77c6e9, 2011-03-29 (annotated)

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