339 lines
12 KiB
C
339 lines
12 KiB
C
|
/**
|
|||
|
|
* @file
|
|||
|
|
* ICMP - Internet Control Message Protocol
|
|||
|
|
*
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* 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"
|
|||
|
|
|
|||
|
|
#if LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
|
|||
|
|
|
|||
|
|
#include "lwip/icmp.h"
|
|||
|
|
#include "lwip/inet_chksum.h"
|
|||
|
|
#include "lwip/ip.h"
|
|||
|
|
#include "lwip/def.h"
|
|||
|
|
#include "lwipopts.h"
|
|||
|
|
#include "lwip/stats.h"
|
|||
|
|
#include "lwip/snmp.h"
|
|||
|
|
|
|||
|
|
#include <string.h>
|
|||
|
|
|
|||
|
|
/** Small optimization: set to 0 if incoming PBUF_POOL pbuf always can be
|
|||
|
|
* used to modify and send a response packet (and to 1 if this is not the case,
|
|||
|
|
* e.g. when link header is stripped of when receiving) */
|
|||
|
|
#ifndef LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
|
|||
|
|
#define LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN 1
|
|||
|
|
#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
|
|||
|
|
|
|||
|
|
/* The amount of data from the original packet to return in a dest-unreachable */
|
|||
|
|
#define ICMP_DEST_UNREACH_DATASIZE 8
|
|||
|
|
|
|||
|
|
static void icmp_send_response(struct pbuf *p, u8_t type, u8_t code);
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* Processes ICMP input packets, called from ip_input().
|
|||
|
|
*
|
|||
|
|
* Currently only processes icmp echo requests and sends
|
|||
|
|
* out the echo response.
|
|||
|
|
*
|
|||
|
|
* @param p the icmp echo request packet, p->payload pointing to the ip header
|
|||
|
|
* @param inp the netif on which this packet was received
|
|||
|
|
*/
|
|||
|
|
void
|
|||
|
|
icmp_input(struct pbuf *p, struct netif *inp)
|
|||
|
|
{
|
|||
|
|
u8_t type;
|
|||
|
|
#ifdef LWIP_DEBUG
|
|||
|
|
u8_t code;
|
|||
|
|
#endif /* LWIP_DEBUG */
|
|||
|
|
struct icmp_echo_hdr *iecho;
|
|||
|
|
struct ip_hdr *iphdr;
|
|||
|
|
s16_t hlen;
|
|||
|
|
|
|||
|
|
ICMP_STATS_INC(icmp.recv);
|
|||
|
|
snmp_inc_icmpinmsgs();
|
|||
|
|
|
|||
|
|
|
|||
|
|
iphdr = (struct ip_hdr *)p->payload;
|
|||
|
|
hlen = IPH_HL(iphdr) * 4;
|
|||
|
|
if (pbuf_header(p, -hlen) || (p->tot_len < sizeof(u16_t)*2)) {
|
|||
|
|
LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: short ICMP (%"U16_F" bytes) received\n", p->tot_len));
|
|||
|
|
goto lenerr;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
type = *((u8_t *)p->payload);
|
|||
|
|
#ifdef LWIP_DEBUG
|
|||
|
|
code = *(((u8_t *)p->payload)+1);
|
|||
|
|
#endif /* LWIP_DEBUG */
|
|||
|
|
switch (type) {
|
|||
|
|
case ICMP_ER:
|
|||
|
|
/* This is OK, echo reply might have been parsed by a raw PCB
|
|||
|
|
(as obviously, an echo request has been sent, too). */
|
|||
|
|
break;
|
|||
|
|
case ICMP_ECHO:
|
|||
|
|
#if !LWIP_MULTICAST_PING || !LWIP_BROADCAST_PING
|
|||
|
|
{
|
|||
|
|
int accepted = 1;
|
|||
|
|
#if !LWIP_MULTICAST_PING
|
|||
|
|
/* multicast destination address? */
|
|||
|
|
if (ip_addr_ismulticast(¤t_iphdr_dest)) {
|
|||
|
|
accepted = 0;
|
|||
|
|
}
|
|||
|
|
#endif /* LWIP_MULTICAST_PING */
|
|||
|
|
#if !LWIP_BROADCAST_PING
|
|||
|
|
/* broadcast destination address? */
|
|||
|
|
if (ip_addr_isbroadcast(¤t_iphdr_dest, inp)) {
|
|||
|
|
accepted = 0;
|
|||
|
|
}
|
|||
|
|
#endif /* LWIP_BROADCAST_PING */
|
|||
|
|
/* broadcast or multicast destination address not acceptd? */
|
|||
|
|
if (!accepted) {
|
|||
|
|
LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: Not echoing to multicast or broadcast pings\n"));
|
|||
|
|
ICMP_STATS_INC(icmp.err);
|
|||
|
|
pbuf_free(p);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
#endif /* !LWIP_MULTICAST_PING || !LWIP_BROADCAST_PING */
|
|||
|
|
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"));
|
|||
|
|
goto lenerr;
|
|||
|
|
}
|
|||
|
|
if (inet_chksum_pbuf(p) != 0) {
|
|||
|
|
LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: checksum failed for received ICMP echo\n"));
|
|||
|
|
pbuf_free(p);
|
|||
|
|
ICMP_STATS_INC(icmp.chkerr);
|
|||
|
|
snmp_inc_icmpinerrors();
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
#if LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
|
|||
|
|
if (pbuf_header(p, (PBUF_IP_HLEN + PBUF_LINK_HLEN))) {
|
|||
|
|
/* p is not big enough to contain link headers
|
|||
|
|
* allocate a new one and copy p into it
|
|||
|
|
*/
|
|||
|
|
struct pbuf *r;
|
|||
|
|
/* switch p->payload to ip header */
|
|||
|
|
if (pbuf_header(p, hlen)) {
|
|||
|
|
LWIP_ASSERT("icmp_input: moving p->payload to ip header failed\n", 0);
|
|||
|
|
goto memerr;
|
|||
|
|
}
|
|||
|
|
/* allocate new packet buffer with space for link headers */
|
|||
|
|
r = pbuf_alloc(PBUF_LINK, p->tot_len, PBUF_RAM);
|
|||
|
|
if (r == NULL) {
|
|||
|
|
LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: allocating new pbuf failed\n"));
|
|||
|
|
goto memerr;
|
|||
|
|
}
|
|||
|
|
LWIP_ASSERT("check that first pbuf can hold struct the ICMP header",
|
|||
|
|
(r->len >= hlen + sizeof(struct icmp_echo_hdr)));
|
|||
|
|
/* copy the whole packet including ip header */
|
|||
|
|
if (pbuf_copy(r, p) != ERR_OK) {
|
|||
|
|
LWIP_ASSERT("icmp_input: copying to new pbuf failed\n", 0);
|
|||
|
|
goto memerr;
|
|||
|
|
}
|
|||
|
|
iphdr = (struct ip_hdr *)r->payload;
|
|||
|
|
/* switch r->payload back to icmp header */
|
|||
|
|
if (pbuf_header(r, -hlen)) {
|
|||
|
|
LWIP_ASSERT("icmp_input: restoring original p->payload failed\n", 0);
|
|||
|
|
goto memerr;
|
|||
|
|
}
|
|||
|
|
/* free the original p */
|
|||
|
|
pbuf_free(p);
|
|||
|
|
/* we now have an identical copy of p that has room for link headers */
|
|||
|
|
p = r;
|
|||
|
|
} else {
|
|||
|
|
/* restore p->payload to point to icmp header */
|
|||
|
|
if (pbuf_header(p, -(s16_t)(PBUF_IP_HLEN + PBUF_LINK_HLEN))) {
|
|||
|
|
LWIP_ASSERT("icmp_input: restoring original p->payload failed\n", 0);
|
|||
|
|
goto memerr;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
|
|||
|
|
/* At this point, all checks are OK. */
|
|||
|
|
/* We generate an answer by switching the dest and src ip addresses,
|
|||
|
|
* setting the icmp type to ECHO_RESPONSE and updating the checksum. */
|
|||
|
|
iecho = (struct icmp_echo_hdr *)p->payload;
|
|||
|
|
ip_addr_copy(iphdr->src, *ip_current_dest_addr());
|
|||
|
|
ip_addr_copy(iphdr->dest, *ip_current_src_addr());
|
|||
|
|
ICMPH_TYPE_SET(iecho, ICMP_ER);
|
|||
|
|
/* adjust the checksum */
|
|||
|
|
if (iecho->chksum >= PP_HTONS(0xffff - (ICMP_ECHO << 8))) {
|
|||
|
|
iecho->chksum += PP_HTONS(ICMP_ECHO << 8) + 1;
|
|||
|
|
} else {
|
|||
|
|
iecho->chksum += PP_HTONS(ICMP_ECHO << 8);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* Set the correct TTL and recalculate the header checksum. */
|
|||
|
|
IPH_TTL_SET(iphdr, ICMP_TTL);
|
|||
|
|
IPH_CHKSUM_SET(iphdr, 0);
|
|||
|
|
#if CHECKSUM_GEN_IP
|
|||
|
|
IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, IP_HLEN));
|
|||
|
|
#endif /* CHECKSUM_GEN_IP */
|
|||
|
|
|
|||
|
|
ICMP_STATS_INC(icmp.xmit);
|
|||
|
|
/* increase number of messages attempted to send */
|
|||
|
|
snmp_inc_icmpoutmsgs();
|
|||
|
|
/* increase number of echo replies attempted to send */
|
|||
|
|
snmp_inc_icmpoutechoreps();
|
|||
|
|
|
|||
|
|
if(pbuf_header(p, hlen)) {
|
|||
|
|
LWIP_ASSERT("Can't move over header in packet", 0);
|
|||
|
|
} else {
|
|||
|
|
err_t ret;
|
|||
|
|
/* send an ICMP packet, src addr is the dest addr of the curren packet */
|
|||
|
|
ret = ip_output_if(p, ip_current_dest_addr(), IP_HDRINCL,
|
|||
|
|
ICMP_TTL, 0, IP_PROTO_ICMP, inp);
|
|||
|
|
if (ret != ERR_OK) {
|
|||
|
|
LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ip_output_if returned an error: %c.\n", ret));
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
break;
|
|||
|
|
default:
|
|||
|
|
LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ICMP type %"S16_F" code %"S16_F" not supported.\n",
|
|||
|
|
(s16_t)type, (s16_t)code));
|
|||
|
|
ICMP_STATS_INC(icmp.proterr);
|
|||
|
|
ICMP_STATS_INC(icmp.drop);
|
|||
|
|
}
|
|||
|
|
pbuf_free(p);
|
|||
|
|
return;
|
|||
|
|
lenerr:
|
|||
|
|
pbuf_free(p);
|
|||
|
|
ICMP_STATS_INC(icmp.lenerr);
|
|||
|
|
snmp_inc_icmpinerrors();
|
|||
|
|
return;
|
|||
|
|
#if LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
|
|||
|
|
memerr:
|
|||
|
|
pbuf_free(p);
|
|||
|
|
ICMP_STATS_INC(icmp.err);
|
|||
|
|
snmp_inc_icmpinerrors();
|
|||
|
|
return;
|
|||
|
|
#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* Send an icmp 'destination unreachable' packet, called from ip_input() if
|
|||
|
|
* the transport layer protocol is unknown and from udp_input() if the local
|
|||
|
|
* port is not bound.
|
|||
|
|
*
|
|||
|
|
* @param p the input packet for which the 'unreachable' should be sent,
|
|||
|
|
* p->payload pointing to the IP header
|
|||
|
|
* @param t type of the 'unreachable' packet
|
|||
|
|
*/
|
|||
|
|
void
|
|||
|
|
icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t)
|
|||
|
|
{
|
|||
|
|
icmp_send_response(p, ICMP_DUR, t);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
#if IP_FORWARD || IP_REASSEMBLY
|
|||
|
|
/**
|
|||
|
|
* Send a 'time exceeded' packet, called from ip_forward() if TTL is 0.
|
|||
|
|
*
|
|||
|
|
* @param p the input packet for which the 'time exceeded' should be sent,
|
|||
|
|
* p->payload pointing to the IP header
|
|||
|
|
* @param t type of the 'time exceeded' packet
|
|||
|
|
*/
|
|||
|
|
void
|
|||
|
|
icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t)
|
|||
|
|
{
|
|||
|
|
icmp_send_response(p, ICMP_TE, t);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
#endif /* IP_FORWARD || IP_REASSEMBLY */
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* Send an icmp packet in response to an incoming packet.
|
|||
|
|
*
|
|||
|
|
* @param p the input packet for which the 'unreachable' should be sent,
|
|||
|
|
* p->payload pointing to the IP header
|
|||
|
|
* @param type Type of the ICMP header
|
|||
|
|
* @param code Code of the ICMP header
|
|||
|
|
*/
|
|||
|
|
static void ICACHE_FLASH_ATTR
|
|||
|
|
icmp_send_response(struct pbuf *p, u8_t type, u8_t code)
|
|||
|
|
{
|
|||
|
|
struct pbuf *q;
|
|||
|
|
struct ip_hdr *iphdr;
|
|||
|
|
/* we can use the echo header here */
|
|||
|
|
struct icmp_echo_hdr *icmphdr;
|
|||
|
|
ip_addr_t iphdr_src;
|
|||
|
|
|
|||
|
|
/* ICMP header + IP header + 8 bytes of data */
|
|||
|
|
//Ϊ<><CEAA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>pbuf<75>ռ䣬pbuf<75><66>Ԥ<EFBFBD><D4A4>IP<49>ײ<EFBFBD><D7B2><EFBFBD><EFBFBD><EFBFBD>̫<EFBFBD><CCAB><EFBFBD>ײ<EFBFBD><D7B2>ռ䣬pbuf<75><66><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
|
//<2F><><EFBFBD><EFBFBD>=<3D><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ײ<EFBFBD>+<2B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݳ<EFBFBD><DDB3><EFBFBD>(IP<49>ײ<EFBFBD><D7B2><EFBFBD><EFBFBD><EFBFBD>+8)
|
|||
|
|
q = pbuf_alloc(PBUF_IP, sizeof(struct icmp_echo_hdr) + IP_HLEN + ICMP_DEST_UNREACH_DATASIZE,
|
|||
|
|
PBUF_RAM);
|
|||
|
|
if (q == NULL) {//ʧ<>ܣ<EFBFBD><DCA3><EFBFBD><EFBFBD><EFBFBD>
|
|||
|
|
LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded: failed to allocate pbuf for ICMP packet.\n"));
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
LWIP_ASSERT("check that first pbuf can hold icmp message",
|
|||
|
|
(q->len >= (sizeof(struct icmp_echo_hdr) + IP_HLEN + ICMP_DEST_UNREACH_DATASIZE)));
|
|||
|
|
|
|||
|
|
iphdr = (struct ip_hdr *)p->payload;//ָ<><D6B8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>IP<49><50><EFBFBD>ݰ<EFBFBD><DDB0>ײ<EFBFBD>
|
|||
|
|
LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded from "));
|
|||
|
|
ip_addr_debug_print(ICMP_DEBUG, &(iphdr->src));
|
|||
|
|
LWIP_DEBUGF(ICMP_DEBUG, (" to "));
|
|||
|
|
ip_addr_debug_print(ICMP_DEBUG, &(iphdr->dest));
|
|||
|
|
LWIP_DEBUGF(ICMP_DEBUG, ("\n"));
|
|||
|
|
|
|||
|
|
icmphdr = (struct icmp_echo_hdr *)q->payload;//ָ<><D6B8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ײ<EFBFBD>
|
|||
|
|
icmphdr->type = type;//<2F><>д<EFBFBD><D0B4><EFBFBD><EFBFBD><EFBFBD>ֶ<EFBFBD>
|
|||
|
|
icmphdr->code = code;//<2F><>д<EFBFBD><D0B4><EFBFBD><EFBFBD><EFBFBD>ֶ<EFBFBD>
|
|||
|
|
icmphdr->id = 0;//<2F><><EFBFBD><EFBFBD>Ŀ<EFBFBD>IJ<EFBFBD><C4B2>ɴ<EFBFBD><C9B4><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݱ<EFBFBD><DDB1><EFBFBD>ʱ
|
|||
|
|
icmphdr->seqno = 0;//<2F><><EFBFBD>ģ<EFBFBD><C4A3>ײ<EFBFBD>ʣ<EFBFBD><CAA3><EFBFBD><EFBFBD>4<EFBFBD><34><EFBFBD>ֽڶ<D6BD>Ϊ0
|
|||
|
|
|
|||
|
|
/* copy fields from original packet <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>IP<49><50><EFBFBD>ݱ<EFBFBD><DDB1><EFBFBD>IP<49>ײ<EFBFBD>+8<>ֽ<EFBFBD><D6BD><EFBFBD><EFBFBD>ݿ<EFBFBD><DDBF><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>*/
|
|||
|
|
SMEMCPY((u8_t *)q->payload + sizeof(struct icmp_echo_hdr), (u8_t *)p->payload,
|
|||
|
|
IP_HLEN + ICMP_DEST_UNREACH_DATASIZE);
|
|||
|
|
|
|||
|
|
/* calculate checksum */
|
|||
|
|
icmphdr->chksum = 0;//<2F><><EFBFBD><EFBFBD>У<EFBFBD><D0A3><EFBFBD><EFBFBD><EFBFBD>ֶ<EFBFBD><D6B6><EFBFBD>0
|
|||
|
|
icmphdr->chksum = inet_chksum(icmphdr, q->len);//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>дУ<D0B4><D0A3><EFBFBD><EFBFBD>
|
|||
|
|
ICMP_STATS_INC(icmp.xmit);
|
|||
|
|
/* increase number of messages attempted to send */
|
|||
|
|
snmp_inc_icmpoutmsgs();
|
|||
|
|
/* increase number of destination unreachable messages attempted to send */
|
|||
|
|
snmp_inc_icmpouttimeexcds();
|
|||
|
|
ip_addr_copy(iphdr_src, iphdr->src);
|
|||
|
|
ip_output(q, NULL, &iphdr_src, ICMP_TTL, 0, IP_PROTO_ICMP);//<2F><><EFBFBD><EFBFBD>IP<49>㺯<EFBFBD><E3BAAF><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ICMP<4D><50><EFBFBD><EFBFBD>
|
|||
|
|
pbuf_free(q);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
#endif /* LWIP_ICMP */
|