497 lines
14 KiB
C
497 lines
14 KiB
C
/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994, 1995, 1996
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $FreeBSD$
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/tcpdump/print-icmp.c,v 1.62 2001/07/24 16:56:11 fenner Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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struct mbuf;
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struct rtentry;
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#include <netinet/in.h>
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#include <stdio.h>
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#include <string.h>
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#include <netdb.h> /* for MAXHOSTNAMELEN on some platforms */
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#include "interface.h"
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#include "addrtoname.h"
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#include "extract.h" /* must come after interface.h */
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#include "ip.h"
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#include "udp.h"
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/*
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* Interface Control Message Protocol Definitions.
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* Per RFC 792, September 1981.
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*/
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/*
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* Structure of an icmp header.
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*/
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struct icmp {
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u_int8_t icmp_type; /* type of message, see below */
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u_int8_t icmp_code; /* type sub code */
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u_int16_t icmp_cksum; /* ones complement cksum of struct */
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union {
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u_int8_t ih_pptr; /* ICMP_PARAMPROB */
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struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
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struct ih_idseq {
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u_int16_t icd_id;
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u_int16_t icd_seq;
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} ih_idseq;
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u_int32_t ih_void;
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/* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
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struct ih_pmtu {
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u_int16_t ipm_void;
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u_int16_t ipm_nextmtu;
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} ih_pmtu;
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} icmp_hun;
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#define icmp_pptr icmp_hun.ih_pptr
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#define icmp_gwaddr icmp_hun.ih_gwaddr
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#define icmp_id icmp_hun.ih_idseq.icd_id
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#define icmp_seq icmp_hun.ih_idseq.icd_seq
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#define icmp_void icmp_hun.ih_void
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#define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void
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#define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu
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union {
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struct id_ts {
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u_int32_t its_otime;
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u_int32_t its_rtime;
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u_int32_t its_ttime;
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} id_ts;
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struct id_ip {
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struct ip idi_ip;
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/* options and then 64 bits of data */
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} id_ip;
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u_int32_t id_mask;
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u_int8_t id_data[1];
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} icmp_dun;
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#define icmp_otime icmp_dun.id_ts.its_otime
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#define icmp_rtime icmp_dun.id_ts.its_rtime
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#define icmp_ttime icmp_dun.id_ts.its_ttime
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#define icmp_ip icmp_dun.id_ip.idi_ip
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#define icmp_mask icmp_dun.id_mask
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#define icmp_data icmp_dun.id_data
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};
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/*
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* Lower bounds on packet lengths for various types.
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* For the error advice packets must first insure that the
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* packet is large enought to contain the returned ip header.
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* Only then can we do the check to see if 64 bits of packet
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* data have been returned, since we need to check the returned
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* ip header length.
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*/
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#define ICMP_MINLEN 8 /* abs minimum */
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#define ICMP_TSLEN (8 + 3 * sizeof (u_int32_t)) /* timestamp */
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#define ICMP_MASKLEN 12 /* address mask */
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#define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
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#define ICMP_ADVLEN(p) (8 + (IP_HL(&(p)->icmp_ip) << 2) + 8)
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/* N.B.: must separately check that ip_hl >= 5 */
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/*
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* Definition of type and code field values.
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*/
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#define ICMP_ECHOREPLY 0 /* echo reply */
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#define ICMP_UNREACH 3 /* dest unreachable, codes: */
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#define ICMP_UNREACH_NET 0 /* bad net */
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#define ICMP_UNREACH_HOST 1 /* bad host */
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#define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
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#define ICMP_UNREACH_PORT 3 /* bad port */
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#define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
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#define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
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#define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */
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#define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */
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#define ICMP_UNREACH_ISOLATED 8 /* src host isolated */
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#define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */
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#define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */
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#define ICMP_UNREACH_TOSNET 11 /* bad tos for net */
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#define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */
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#define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */
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#define ICMP_REDIRECT 5 /* shorter route, codes: */
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#define ICMP_REDIRECT_NET 0 /* for network */
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#define ICMP_REDIRECT_HOST 1 /* for host */
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#define ICMP_REDIRECT_TOSNET 2 /* for tos and net */
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#define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */
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#define ICMP_ECHO 8 /* echo service */
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#define ICMP_ROUTERADVERT 9 /* router advertisement */
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#define ICMP_ROUTERSOLICIT 10 /* router solicitation */
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#define ICMP_TIMXCEED 11 /* time exceeded, code: */
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#define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */
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#define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */
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#define ICMP_PARAMPROB 12 /* ip header bad */
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#define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */
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#define ICMP_TSTAMP 13 /* timestamp request */
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#define ICMP_TSTAMPREPLY 14 /* timestamp reply */
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#define ICMP_IREQ 15 /* information request */
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#define ICMP_IREQREPLY 16 /* information reply */
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#define ICMP_MASKREQ 17 /* address mask request */
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#define ICMP_MASKREPLY 18 /* address mask reply */
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#define ICMP_MAXTYPE 18
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#define ICMP_INFOTYPE(type) \
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((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
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(type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
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(type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
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(type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
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(type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
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/* rfc1700 */
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#ifndef ICMP_UNREACH_NET_UNKNOWN
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#define ICMP_UNREACH_NET_UNKNOWN 6 /* destination net unknown */
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#endif
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#ifndef ICMP_UNREACH_HOST_UNKNOWN
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#define ICMP_UNREACH_HOST_UNKNOWN 7 /* destination host unknown */
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#endif
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#ifndef ICMP_UNREACH_ISOLATED
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#define ICMP_UNREACH_ISOLATED 8 /* source host isolated */
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#endif
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#ifndef ICMP_UNREACH_NET_PROHIB
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#define ICMP_UNREACH_NET_PROHIB 9 /* admin prohibited net */
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#endif
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#ifndef ICMP_UNREACH_HOST_PROHIB
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#define ICMP_UNREACH_HOST_PROHIB 10 /* admin prohibited host */
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#endif
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#ifndef ICMP_UNREACH_TOSNET
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#define ICMP_UNREACH_TOSNET 11 /* tos prohibited net */
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#endif
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#ifndef ICMP_UNREACH_TOSHOST
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#define ICMP_UNREACH_TOSHOST 12 /* tos prohibited host */
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#endif
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/* rfc1716 */
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#ifndef ICMP_UNREACH_FILTER_PROHIB
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#define ICMP_UNREACH_FILTER_PROHIB 13 /* admin prohibited filter */
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#endif
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#ifndef ICMP_UNREACH_HOST_PRECEDENCE
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#define ICMP_UNREACH_HOST_PRECEDENCE 14 /* host precedence violation */
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#endif
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#ifndef ICMP_UNREACH_PRECEDENCE_CUTOFF
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#define ICMP_UNREACH_PRECEDENCE_CUTOFF 15 /* precedence cutoff */
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#endif
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/* Most of the icmp types */
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static struct tok icmp2str[] = {
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{ ICMP_ECHOREPLY, "echo reply" },
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{ ICMP_SOURCEQUENCH, "source quench" },
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{ ICMP_ECHO, "echo request" },
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{ ICMP_ROUTERSOLICIT, "router solicitation" },
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{ ICMP_TSTAMP, "time stamp request" },
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{ ICMP_TSTAMPREPLY, "time stamp reply" },
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{ ICMP_IREQ, "information request" },
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{ ICMP_IREQREPLY, "information reply" },
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{ ICMP_MASKREQ, "address mask request" },
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{ 0, NULL }
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};
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/* Formats for most of the ICMP_UNREACH codes */
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static struct tok unreach2str[] = {
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{ ICMP_UNREACH_NET, "net %s unreachable" },
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{ ICMP_UNREACH_HOST, "host %s unreachable" },
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{ ICMP_UNREACH_SRCFAIL,
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"%s unreachable - source route failed" },
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{ ICMP_UNREACH_NET_UNKNOWN, "net %s unreachable - unknown" },
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{ ICMP_UNREACH_HOST_UNKNOWN, "host %s unreachable - unknown" },
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{ ICMP_UNREACH_ISOLATED,
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"%s unreachable - source host isolated" },
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{ ICMP_UNREACH_NET_PROHIB,
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"net %s unreachable - admin prohibited" },
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{ ICMP_UNREACH_HOST_PROHIB,
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"host %s unreachable - admin prohibited" },
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{ ICMP_UNREACH_TOSNET,
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"net %s unreachable - tos prohibited" },
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{ ICMP_UNREACH_TOSHOST,
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"host %s unreachable - tos prohibited" },
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{ ICMP_UNREACH_FILTER_PROHIB,
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"host %s unreachable - admin prohibited filter" },
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{ ICMP_UNREACH_HOST_PRECEDENCE,
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"host %s unreachable - host precedence violation" },
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{ ICMP_UNREACH_PRECEDENCE_CUTOFF,
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"host %s unreachable - precedence cutoff" },
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{ 0, NULL }
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};
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/* Formats for the ICMP_REDIRECT codes */
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static struct tok type2str[] = {
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{ ICMP_REDIRECT_NET, "redirect %s to net %s" },
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{ ICMP_REDIRECT_HOST, "redirect %s to host %s" },
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{ ICMP_REDIRECT_TOSNET, "redirect-tos %s to net %s" },
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{ ICMP_REDIRECT_TOSHOST, "redirect-tos %s to host %s" },
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{ 0, NULL }
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};
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/* rfc1191 */
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struct mtu_discovery {
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u_int16_t unused;
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u_int16_t nexthopmtu;
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};
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/* rfc1256 */
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struct ih_rdiscovery {
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u_int8_t ird_addrnum;
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u_int8_t ird_addrsiz;
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u_int16_t ird_lifetime;
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};
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struct id_rdiscovery {
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u_int32_t ird_addr;
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u_int32_t ird_pref;
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};
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void
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icmp_print(const u_char *bp, u_int plen, const u_char *bp2)
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{
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char *cp;
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const struct icmp *dp;
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const struct ip *ip;
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const char *str, *fmt;
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const struct ip *oip;
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const struct udphdr *ouh;
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u_int hlen, dport, mtu;
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char buf[MAXHOSTNAMELEN + 100];
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dp = (struct icmp *)bp;
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ip = (struct ip *)bp2;
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str = buf;
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TCHECK(dp->icmp_code);
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switch (dp->icmp_type) {
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case ICMP_UNREACH:
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TCHECK(dp->icmp_ip.ip_dst);
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switch (dp->icmp_code) {
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case ICMP_UNREACH_PROTOCOL:
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TCHECK(dp->icmp_ip.ip_p);
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(void)snprintf(buf, sizeof(buf),
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"%s protocol %d unreachable",
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ipaddr_string(&dp->icmp_ip.ip_dst),
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dp->icmp_ip.ip_p);
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break;
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case ICMP_UNREACH_PORT:
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TCHECK(dp->icmp_ip.ip_p);
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oip = &dp->icmp_ip;
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hlen = IP_HL(oip) * 4;
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ouh = (struct udphdr *)(((u_char *)oip) + hlen);
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dport = ntohs(ouh->uh_dport);
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switch (oip->ip_p) {
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case IPPROTO_TCP:
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(void)snprintf(buf, sizeof(buf),
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"%s tcp port %s unreachable",
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ipaddr_string(&oip->ip_dst),
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tcpport_string(dport));
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break;
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case IPPROTO_UDP:
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(void)snprintf(buf, sizeof(buf),
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"%s udp port %s unreachable",
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ipaddr_string(&oip->ip_dst),
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udpport_string(dport));
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break;
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default:
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(void)snprintf(buf, sizeof(buf),
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"%s protocol %d port %d unreachable",
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ipaddr_string(&oip->ip_dst),
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oip->ip_p, dport);
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break;
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}
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break;
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case ICMP_UNREACH_NEEDFRAG:
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{
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register const struct mtu_discovery *mp;
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mp = (struct mtu_discovery *)&dp->icmp_void;
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mtu = EXTRACT_16BITS(&mp->nexthopmtu);
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if (mtu) {
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(void)snprintf(buf, sizeof(buf),
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"%s unreachable - need to frag (mtu %d)",
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ipaddr_string(&dp->icmp_ip.ip_dst), mtu);
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} else {
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(void)snprintf(buf, sizeof(buf),
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"%s unreachable - need to frag",
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ipaddr_string(&dp->icmp_ip.ip_dst));
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}
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}
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break;
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default:
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fmt = tok2str(unreach2str, "#%d %%s unreachable",
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dp->icmp_code);
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(void)snprintf(buf, sizeof(buf), fmt,
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ipaddr_string(&dp->icmp_ip.ip_dst));
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break;
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}
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break;
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case ICMP_REDIRECT:
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TCHECK(dp->icmp_ip.ip_dst);
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fmt = tok2str(type2str, "redirect-#%d %%s to net %%s",
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dp->icmp_code);
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(void)snprintf(buf, sizeof(buf), fmt,
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ipaddr_string(&dp->icmp_ip.ip_dst),
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ipaddr_string(&dp->icmp_gwaddr));
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break;
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case ICMP_ROUTERADVERT:
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{
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register const struct ih_rdiscovery *ihp;
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register const struct id_rdiscovery *idp;
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u_int lifetime, num, size;
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(void)snprintf(buf, sizeof(buf), "router advertisement");
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cp = buf + strlen(buf);
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ihp = (struct ih_rdiscovery *)&dp->icmp_void;
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TCHECK(*ihp);
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(void)strncpy(cp, " lifetime ", sizeof(buf) - (cp - buf));
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cp = buf + strlen(buf);
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lifetime = EXTRACT_16BITS(&ihp->ird_lifetime);
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if (lifetime < 60) {
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(void)snprintf(cp, sizeof(buf) - (cp - buf), "%u",
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lifetime);
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} else if (lifetime < 60 * 60) {
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(void)snprintf(cp, sizeof(buf) - (cp - buf), "%u:%02u",
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lifetime / 60, lifetime % 60);
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} else {
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(void)snprintf(cp, sizeof(buf) - (cp - buf),
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"%u:%02u:%02u",
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lifetime / 3600,
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(lifetime % 3600) / 60,
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lifetime % 60);
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}
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cp = buf + strlen(buf);
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num = ihp->ird_addrnum;
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(void)snprintf(cp, sizeof(buf) - (cp - buf), " %d:", num);
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cp = buf + strlen(buf);
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size = ihp->ird_addrsiz;
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if (size != 2) {
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(void)snprintf(cp, sizeof(buf) - (cp - buf),
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" [size %d]", size);
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break;
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}
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idp = (struct id_rdiscovery *)&dp->icmp_data;
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while (num-- > 0) {
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TCHECK(*idp);
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(void)snprintf(cp, sizeof(buf) - (cp - buf), " {%s %u}",
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ipaddr_string(&idp->ird_addr),
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EXTRACT_32BITS(&idp->ird_pref));
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cp = buf + strlen(buf);
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++idp;
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}
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}
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break;
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case ICMP_TIMXCEED:
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TCHECK(dp->icmp_ip.ip_dst);
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switch (dp->icmp_code) {
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case ICMP_TIMXCEED_INTRANS:
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str = "time exceeded in-transit";
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break;
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case ICMP_TIMXCEED_REASS:
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str = "ip reassembly time exceeded";
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break;
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default:
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(void)snprintf(buf, sizeof(buf), "time exceeded-#%d",
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dp->icmp_code);
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break;
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}
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break;
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case ICMP_PARAMPROB:
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if (dp->icmp_code)
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(void)snprintf(buf, sizeof(buf),
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"parameter problem - code %d", dp->icmp_code);
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else {
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TCHECK(dp->icmp_pptr);
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(void)snprintf(buf, sizeof(buf),
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"parameter problem - octet %d", dp->icmp_pptr);
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}
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break;
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case ICMP_MASKREPLY:
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TCHECK(dp->icmp_mask);
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(void)snprintf(buf, sizeof(buf), "address mask is 0x%08x",
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(unsigned)ntohl(dp->icmp_mask));
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break;
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case ICMP_TSTAMP:
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TCHECK(dp->icmp_seq);
|
|
(void)snprintf(buf, sizeof(buf),
|
|
"time stamp query id %u seq %u",
|
|
(unsigned)ntohs(dp->icmp_id),
|
|
(unsigned)ntohs(dp->icmp_seq));
|
|
break;
|
|
|
|
case ICMP_TSTAMPREPLY:
|
|
TCHECK(dp->icmp_ttime);
|
|
(void)snprintf(buf, sizeof(buf),
|
|
"time stamp reply id %u seq %u : org 0x%lx recv 0x%lx xmit 0x%lx",
|
|
(unsigned)ntohs(dp->icmp_id),
|
|
(unsigned)ntohs(dp->icmp_seq),
|
|
(unsigned long)ntohl(dp->icmp_otime),
|
|
(unsigned long)ntohl(dp->icmp_rtime),
|
|
(unsigned long)ntohl(dp->icmp_ttime));
|
|
break;
|
|
|
|
default:
|
|
str = tok2str(icmp2str, "type-#%d", dp->icmp_type);
|
|
break;
|
|
}
|
|
(void)printf("icmp: %s", str);
|
|
if (vflag) {
|
|
if (TTEST2(*bp, plen)) {
|
|
if (in_cksum((u_short*)dp, plen, 0))
|
|
printf(" (wrong icmp csum)");
|
|
}
|
|
}
|
|
if (vflag > 1 && !ICMP_INFOTYPE(dp->icmp_type)) {
|
|
bp += 8;
|
|
(void)printf(" for ");
|
|
ip = (struct ip *)bp;
|
|
snaplen = snapend - bp;
|
|
ip_print(bp, ntohs(ip->ip_len));
|
|
}
|
|
return;
|
|
trunc:
|
|
fputs("[|icmp]", stdout);
|
|
}
|