+++ /dev/null
-/**
- * @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 "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);
-#if CHECKSUM_GEN_ICMP
- /* adjust the checksum */
- if (iecho->chksum >= PP_HTONS(0xffffU - (ICMP_ECHO << 8))) {
- iecho->chksum += PP_HTONS(ICMP_ECHO << 8) + 1;
- } else {
- iecho->chksum += PP_HTONS(ICMP_ECHO << 8);
- }
-#else /* CHECKSUM_GEN_ICMP */
- iecho->chksum = 0;
-#endif /* CHECKSUM_GEN_ICMP */
-
- /* 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
-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 */
- q = pbuf_alloc(PBUF_IP, sizeof(struct icmp_echo_hdr) + IP_HLEN + ICMP_DEST_UNREACH_DATASIZE,
- PBUF_RAM);
- if (q == NULL) {
- 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;
- 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;
- icmphdr->type = type;
- icmphdr->code = code;
- icmphdr->id = 0;
- icmphdr->seqno = 0;
-
- /* copy fields from original packet */
- 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;
- icmphdr->chksum = inet_chksum(icmphdr, q->len);
- 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);
- pbuf_free(q);
-}
-
-#endif /* LWIP_ICMP */
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