804 lines
25 KiB
C
804 lines
25 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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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: print-icmp.c,v 1.13 2023/08/17 20:19:40 christos Exp $");
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#endif
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/* \summary: Internet Control Message Protocol (ICMP) printer */
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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 "netdissect-stdinc.h"
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#include <stdio.h>
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#include <string.h>
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#include "netdissect.h"
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#include "addrtoname.h"
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#include "extract.h"
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#include "ip.h"
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#include "udp.h"
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#include "ipproto.h"
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#include "mpls.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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nd_uint8_t icmp_type; /* type of message, see below */
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nd_uint8_t icmp_code; /* type sub code */
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nd_uint16_t icmp_cksum; /* ones complement cksum of struct */
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union {
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nd_uint8_t ih_pptr; /* ICMP_PARAMPROB */
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nd_ipv4 ih_gwaddr; /* ICMP_REDIRECT */
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struct ih_idseq {
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nd_uint16_t icd_id;
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nd_uint16_t icd_seq;
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} ih_idseq;
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nd_uint32_t ih_void;
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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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union {
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struct id_ts {
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nd_uint32_t its_otime;
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nd_uint32_t its_rtime;
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nd_uint32_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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nd_uint32_t id_mask;
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nd_byte 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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} UNALIGNED;
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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 enough 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_EXTD_MINLEN (156 - sizeof (struct ip)) /* draft-bonica-internet-icmp-08 */
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#define ICMP_TSLEN (8 + 3 * sizeof (uint32_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_ERRTYPE(type) \
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((type) == ICMP_UNREACH || (type) == ICMP_SOURCEQUENCH || \
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(type) == ICMP_REDIRECT || (type) == ICMP_TIMXCEED || \
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(type) == ICMP_PARAMPROB)
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#define ICMP_MULTIPART_EXT_TYPE(type) \
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((type) == ICMP_UNREACH || \
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(type) == ICMP_TIMXCEED || \
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(type) == ICMP_PARAMPROB)
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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 const 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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/* rfc1191 */
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struct mtu_discovery {
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nd_uint16_t unused;
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nd_uint16_t nexthopmtu;
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};
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/* rfc1256 */
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struct ih_rdiscovery {
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nd_uint8_t ird_addrnum;
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nd_uint8_t ird_addrsiz;
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nd_uint16_t ird_lifetime;
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};
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struct id_rdiscovery {
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nd_uint32_t ird_addr;
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nd_uint32_t ird_pref;
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};
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/*
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* RFC 4884 - Extended ICMP to Support Multi-Part Messages
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*
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* This is a general extension mechanism, based on the mechanism
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* in draft-bonica-icmp-mpls-02 ICMP Extensions for MultiProtocol
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* Label Switching.
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*
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* The Destination Unreachable, Time Exceeded
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* and Parameter Problem messages are slightly changed as per
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* the above RFC. A new Length field gets added to give
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* the caller an idea about the length of the piggybacked
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* IP packet before the extension header starts.
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*
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* The Length field represents length of the padded "original datagram"
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* field measured in 32-bit words.
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Type | Code | Checksum |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | unused | Length | unused |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Internet Header + leading octets of original datagram |
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* | |
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* | // |
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* | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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struct icmp_ext_t {
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nd_uint8_t icmp_type;
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nd_uint8_t icmp_code;
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nd_uint16_t icmp_checksum;
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nd_byte icmp_reserved;
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nd_uint8_t icmp_length;
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nd_byte icmp_reserved2[2];
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nd_byte icmp_ext_legacy_header[128]; /* extension header starts 128 bytes after ICMP header */
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nd_byte icmp_ext_version_res[2];
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nd_uint16_t icmp_ext_checksum;
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nd_byte icmp_ext_data[1];
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};
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/*
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* Extract version from the first octet of icmp_ext_version_res.
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*/
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#define ICMP_EXT_EXTRACT_VERSION(x) (((x)&0xf0)>>4)
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/*
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* Current version.
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*/
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#define ICMP_EXT_VERSION 2
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/*
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* Extension object class numbers.
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*
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* Class 1 dates back to draft-bonica-icmp-mpls-02.
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*/
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/* rfc4950 */
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#define MPLS_STACK_ENTRY_OBJECT_CLASS 1
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struct icmp_multipart_ext_object_header_t {
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nd_uint16_t length;
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nd_uint8_t class_num;
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nd_uint8_t ctype;
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};
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static const struct tok icmp_multipart_ext_obj_values[] = {
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{ 1, "MPLS Stack Entry" },
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{ 2, "Interface Identification" },
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{ 0, NULL}
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};
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/* prototypes */
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const char *icmp_tstamp_print(u_int);
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/* print the milliseconds since midnight UTC */
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const char *
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icmp_tstamp_print(u_int tstamp)
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{
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u_int msec,sec,min,hrs;
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static char buf[64];
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msec = tstamp % 1000;
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sec = tstamp / 1000;
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min = sec / 60; sec -= min * 60;
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hrs = min / 60; min -= hrs * 60;
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snprintf(buf, sizeof(buf), "%02u:%02u:%02u.%03u",hrs,min,sec,msec);
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return buf;
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}
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UNALIGNED_OK
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void
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icmp_print(netdissect_options *ndo, const u_char *bp, u_int plen, const u_char *bp2,
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int fragmented)
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{
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char *cp;
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const struct icmp *dp;
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uint8_t icmp_type, icmp_code;
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const struct icmp_ext_t *ext_dp;
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const struct ip *ip;
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const char *str;
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const struct ip *oip;
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uint8_t ip_proto;
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const struct udphdr *ouh;
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const uint8_t *obj_tptr;
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uint32_t raw_label;
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const struct icmp_multipart_ext_object_header_t *icmp_multipart_ext_object_header;
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u_int hlen, mtu, obj_tlen, obj_class_num, obj_ctype;
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uint16_t dport;
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char buf[MAXHOSTNAMELEN + 100];
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struct cksum_vec vec[1];
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ndo->ndo_protocol = "icmp";
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dp = (const struct icmp *)bp;
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ext_dp = (const struct icmp_ext_t *)bp;
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ip = (const struct ip *)bp2;
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str = buf;
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icmp_type = GET_U_1(dp->icmp_type);
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icmp_code = GET_U_1(dp->icmp_code);
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switch (icmp_type) {
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case ICMP_ECHO:
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case ICMP_ECHOREPLY:
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(void)snprintf(buf, sizeof(buf), "echo %s, id %u, seq %u",
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icmp_type == ICMP_ECHO ?
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"request" : "reply",
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GET_BE_U_2(dp->icmp_id),
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GET_BE_U_2(dp->icmp_seq));
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break;
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case ICMP_UNREACH:
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switch (icmp_code) {
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case ICMP_UNREACH_NET:
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(void)snprintf(buf, sizeof(buf),
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"net %s unreachable",
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GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
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break;
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case ICMP_UNREACH_HOST:
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(void)snprintf(buf, sizeof(buf),
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"host %s unreachable",
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GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
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break;
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case ICMP_UNREACH_PROTOCOL:
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(void)snprintf(buf, sizeof(buf),
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"%s protocol %u unreachable",
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GET_IPADDR_STRING(dp->icmp_ip.ip_dst),
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GET_U_1(dp->icmp_ip.ip_p));
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break;
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case ICMP_UNREACH_PORT:
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ND_TCHECK_1(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 = (const struct udphdr *)(((const u_char *)oip) + hlen);
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dport = GET_BE_U_2(ouh->uh_dport);
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ip_proto = GET_U_1(oip->ip_p);
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switch (ip_proto) {
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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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GET_IPADDR_STRING(oip->ip_dst),
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tcpport_string(ndo, 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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GET_IPADDR_STRING(oip->ip_dst),
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udpport_string(ndo, 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 %u port %u unreachable",
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GET_IPADDR_STRING(oip->ip_dst),
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ip_proto, 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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const struct mtu_discovery *mp;
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mp = (const struct mtu_discovery *)(const u_char *)&dp->icmp_void;
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mtu = GET_BE_U_2(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 %u)",
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GET_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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GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
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}
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}
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break;
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case ICMP_UNREACH_SRCFAIL:
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(void)snprintf(buf, sizeof(buf),
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"%s unreachable - source route failed",
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GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
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break;
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case ICMP_UNREACH_NET_UNKNOWN:
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(void)snprintf(buf, sizeof(buf),
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"net %s unreachable - unknown",
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GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
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break;
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case ICMP_UNREACH_HOST_UNKNOWN:
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(void)snprintf(buf, sizeof(buf),
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"host %s unreachable - unknown",
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GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
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break;
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case ICMP_UNREACH_ISOLATED:
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(void)snprintf(buf, sizeof(buf),
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"%s unreachable - source host isolated",
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GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
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break;
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case ICMP_UNREACH_NET_PROHIB:
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(void)snprintf(buf, sizeof(buf),
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"net %s unreachable - admin prohibited",
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GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
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break;
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case ICMP_UNREACH_HOST_PROHIB:
|
|
(void)snprintf(buf, sizeof(buf),
|
|
"host %s unreachable - admin prohibited",
|
|
GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
|
|
break;
|
|
|
|
case ICMP_UNREACH_TOSNET:
|
|
(void)snprintf(buf, sizeof(buf),
|
|
"net %s unreachable - tos prohibited",
|
|
GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
|
|
break;
|
|
|
|
case ICMP_UNREACH_TOSHOST:
|
|
(void)snprintf(buf, sizeof(buf),
|
|
"host %s unreachable - tos prohibited",
|
|
GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
|
|
break;
|
|
|
|
case ICMP_UNREACH_FILTER_PROHIB:
|
|
(void)snprintf(buf, sizeof(buf),
|
|
"host %s unreachable - admin prohibited filter",
|
|
GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
|
|
break;
|
|
|
|
case ICMP_UNREACH_HOST_PRECEDENCE:
|
|
(void)snprintf(buf, sizeof(buf),
|
|
"host %s unreachable - host precedence violation",
|
|
GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
|
|
break;
|
|
|
|
case ICMP_UNREACH_PRECEDENCE_CUTOFF:
|
|
(void)snprintf(buf, sizeof(buf),
|
|
"host %s unreachable - precedence cutoff",
|
|
GET_IPADDR_STRING(dp->icmp_ip.ip_dst));
|
|
break;
|
|
|
|
default:
|
|
(void)snprintf(buf, sizeof(buf),
|
|
"%s unreachable - #%u",
|
|
GET_IPADDR_STRING(dp->icmp_ip.ip_dst),
|
|
icmp_code);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case ICMP_REDIRECT:
|
|
switch (icmp_code) {
|
|
|
|
case ICMP_REDIRECT_NET:
|
|
(void)snprintf(buf, sizeof(buf),
|
|
"redirect %s to net %s",
|
|
GET_IPADDR_STRING(dp->icmp_ip.ip_dst),
|
|
GET_IPADDR_STRING(dp->icmp_gwaddr));
|
|
break;
|
|
|
|
case ICMP_REDIRECT_HOST:
|
|
(void)snprintf(buf, sizeof(buf),
|
|
"redirect %s to host %s",
|
|
GET_IPADDR_STRING(dp->icmp_ip.ip_dst),
|
|
GET_IPADDR_STRING(dp->icmp_gwaddr));
|
|
break;
|
|
|
|
case ICMP_REDIRECT_TOSNET:
|
|
(void)snprintf(buf, sizeof(buf),
|
|
"redirect-tos %s to net %s",
|
|
GET_IPADDR_STRING(dp->icmp_ip.ip_dst),
|
|
GET_IPADDR_STRING(dp->icmp_gwaddr));
|
|
break;
|
|
|
|
case ICMP_REDIRECT_TOSHOST:
|
|
(void)snprintf(buf, sizeof(buf),
|
|
"redirect-tos %s to host %s",
|
|
GET_IPADDR_STRING(dp->icmp_ip.ip_dst),
|
|
GET_IPADDR_STRING(dp->icmp_gwaddr));
|
|
break;
|
|
|
|
default:
|
|
(void)snprintf(buf, sizeof(buf),
|
|
"redirect-#%u %s to %s", icmp_code,
|
|
GET_IPADDR_STRING(dp->icmp_ip.ip_dst),
|
|
GET_IPADDR_STRING(dp->icmp_gwaddr));
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case ICMP_ROUTERADVERT:
|
|
{
|
|
const struct ih_rdiscovery *ihp;
|
|
const struct id_rdiscovery *idp;
|
|
u_int lifetime, num, size;
|
|
|
|
(void)snprintf(buf, sizeof(buf), "router advertisement");
|
|
cp = buf + strlen(buf);
|
|
|
|
ihp = (const struct ih_rdiscovery *)&dp->icmp_void;
|
|
ND_TCHECK_SIZE(ihp);
|
|
(void)strncpy(cp, " lifetime ", sizeof(buf) - (cp - buf));
|
|
cp = buf + strlen(buf);
|
|
lifetime = GET_BE_U_2(ihp->ird_lifetime);
|
|
if (lifetime < 60) {
|
|
(void)snprintf(cp, sizeof(buf) - (cp - buf), "%u",
|
|
lifetime);
|
|
} else if (lifetime < 60 * 60) {
|
|
(void)snprintf(cp, sizeof(buf) - (cp - buf), "%u:%02u",
|
|
lifetime / 60, lifetime % 60);
|
|
} else {
|
|
(void)snprintf(cp, sizeof(buf) - (cp - buf),
|
|
"%u:%02u:%02u",
|
|
lifetime / 3600,
|
|
(lifetime % 3600) / 60,
|
|
lifetime % 60);
|
|
}
|
|
cp = buf + strlen(buf);
|
|
|
|
num = GET_U_1(ihp->ird_addrnum);
|
|
(void)snprintf(cp, sizeof(buf) - (cp - buf), " %u:", num);
|
|
cp = buf + strlen(buf);
|
|
|
|
size = GET_U_1(ihp->ird_addrsiz);
|
|
if (size != 2) {
|
|
(void)snprintf(cp, sizeof(buf) - (cp - buf),
|
|
" [size %u]", size);
|
|
break;
|
|
}
|
|
idp = (const struct id_rdiscovery *)&dp->icmp_data;
|
|
while (num > 0) {
|
|
ND_TCHECK_SIZE(idp);
|
|
(void)snprintf(cp, sizeof(buf) - (cp - buf), " {%s %u}",
|
|
GET_IPADDR_STRING(idp->ird_addr),
|
|
GET_BE_U_4(idp->ird_pref));
|
|
cp = buf + strlen(buf);
|
|
++idp;
|
|
num--;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case ICMP_TIMXCEED:
|
|
ND_TCHECK_4(dp->icmp_ip.ip_dst);
|
|
switch (icmp_code) {
|
|
|
|
case ICMP_TIMXCEED_INTRANS:
|
|
str = "time exceeded in-transit";
|
|
break;
|
|
|
|
case ICMP_TIMXCEED_REASS:
|
|
str = "ip reassembly time exceeded";
|
|
break;
|
|
|
|
default:
|
|
(void)snprintf(buf, sizeof(buf), "time exceeded-#%u",
|
|
icmp_code);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case ICMP_PARAMPROB:
|
|
if (icmp_code)
|
|
(void)snprintf(buf, sizeof(buf),
|
|
"parameter problem - code %u", icmp_code);
|
|
else {
|
|
(void)snprintf(buf, sizeof(buf),
|
|
"parameter problem - octet %u",
|
|
GET_U_1(dp->icmp_pptr));
|
|
}
|
|
break;
|
|
|
|
case ICMP_MASKREPLY:
|
|
(void)snprintf(buf, sizeof(buf), "address mask is 0x%08x",
|
|
GET_BE_U_4(dp->icmp_mask));
|
|
break;
|
|
|
|
case ICMP_TSTAMP:
|
|
(void)snprintf(buf, sizeof(buf),
|
|
"time stamp query id %u seq %u",
|
|
GET_BE_U_2(dp->icmp_id),
|
|
GET_BE_U_2(dp->icmp_seq));
|
|
break;
|
|
|
|
case ICMP_TSTAMPREPLY:
|
|
ND_TCHECK_4(dp->icmp_ttime);
|
|
(void)snprintf(buf, sizeof(buf),
|
|
"time stamp reply id %u seq %u: org %s",
|
|
GET_BE_U_2(dp->icmp_id),
|
|
GET_BE_U_2(dp->icmp_seq),
|
|
icmp_tstamp_print(GET_BE_U_4(dp->icmp_otime)));
|
|
|
|
(void)snprintf(buf+strlen(buf),sizeof(buf)-strlen(buf),", recv %s",
|
|
icmp_tstamp_print(GET_BE_U_4(dp->icmp_rtime)));
|
|
(void)snprintf(buf+strlen(buf),sizeof(buf)-strlen(buf),", xmit %s",
|
|
icmp_tstamp_print(GET_BE_U_4(dp->icmp_ttime)));
|
|
break;
|
|
|
|
default:
|
|
str = tok2str(icmp2str, "type-#%u", icmp_type);
|
|
break;
|
|
}
|
|
ND_PRINT("ICMP %s, length %u", str, plen);
|
|
if (ndo->ndo_vflag && !fragmented) { /* don't attempt checksumming if this is a frag */
|
|
if (ND_TTEST_LEN(bp, plen)) {
|
|
uint16_t sum;
|
|
|
|
vec[0].ptr = (const uint8_t *)(const void *)dp;
|
|
vec[0].len = plen;
|
|
sum = in_cksum(vec, 1);
|
|
if (sum != 0) {
|
|
uint16_t icmp_sum = GET_BE_U_2(dp->icmp_cksum);
|
|
ND_PRINT(" (wrong icmp cksum %x (->%x)!)",
|
|
icmp_sum,
|
|
in_cksum_shouldbe(icmp_sum, sum));
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* print the remnants of the IP packet.
|
|
* save the snaplength as this may get overridden in the IP printer.
|
|
*/
|
|
if (ndo->ndo_vflag >= 1 && ICMP_ERRTYPE(icmp_type)) {
|
|
const u_char *snapend_save;
|
|
|
|
bp += 8;
|
|
ND_PRINT("\n\t");
|
|
ip = (const struct ip *)bp;
|
|
snapend_save = ndo->ndo_snapend;
|
|
/*
|
|
* Update the snapend because extensions (MPLS, ...) may be
|
|
* present after the IP packet. In this case the current
|
|
* (outer) packet's snapend is not what ip_print() needs to
|
|
* decode an IP packet nested in the middle of an ICMP payload.
|
|
*
|
|
* This prevents that, in ip_print(), for the nested IP packet,
|
|
* the remaining length < remaining caplen.
|
|
*/
|
|
ndo->ndo_snapend = ND_MIN(bp + GET_BE_U_2(ip->ip_len),
|
|
ndo->ndo_snapend);
|
|
ip_print(ndo, bp, GET_BE_U_2(ip->ip_len));
|
|
ndo->ndo_snapend = snapend_save;
|
|
}
|
|
|
|
/* ndo_protocol reassignment after ip_print() call */
|
|
ndo->ndo_protocol = "icmp";
|
|
|
|
/*
|
|
* Attempt to decode multi-part message extensions (rfc4884) only for some ICMP types.
|
|
*/
|
|
if (ndo->ndo_vflag >= 1 && plen > ICMP_EXTD_MINLEN && ICMP_MULTIPART_EXT_TYPE(icmp_type)) {
|
|
|
|
ND_TCHECK_SIZE(ext_dp);
|
|
|
|
/*
|
|
* Check first if the multi-part extension header shows a non-zero length.
|
|
* If the length field is not set then silently verify the checksum
|
|
* to check if an extension header is present. This is expedient,
|
|
* however not all implementations set the length field proper.
|
|
*/
|
|
if (GET_U_1(ext_dp->icmp_length) == 0 &&
|
|
ND_TTEST_LEN(ext_dp->icmp_ext_version_res, plen - ICMP_EXTD_MINLEN)) {
|
|
vec[0].ptr = (const uint8_t *)(const void *)&ext_dp->icmp_ext_version_res;
|
|
vec[0].len = plen - ICMP_EXTD_MINLEN;
|
|
if (in_cksum(vec, 1)) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
ND_PRINT("\n\tICMP Multi-Part extension v%u",
|
|
ICMP_EXT_EXTRACT_VERSION(*(ext_dp->icmp_ext_version_res)));
|
|
|
|
/*
|
|
* Sanity checking of the header.
|
|
*/
|
|
if (ICMP_EXT_EXTRACT_VERSION(*(ext_dp->icmp_ext_version_res)) !=
|
|
ICMP_EXT_VERSION) {
|
|
ND_PRINT(" packet not supported");
|
|
return;
|
|
}
|
|
|
|
hlen = plen - ICMP_EXTD_MINLEN;
|
|
if (ND_TTEST_LEN(ext_dp->icmp_ext_version_res, hlen)) {
|
|
vec[0].ptr = (const uint8_t *)(const void *)&ext_dp->icmp_ext_version_res;
|
|
vec[0].len = hlen;
|
|
ND_PRINT(", checksum 0x%04x (%scorrect), length %u",
|
|
GET_BE_U_2(ext_dp->icmp_ext_checksum),
|
|
in_cksum(vec, 1) ? "in" : "",
|
|
hlen);
|
|
}
|
|
|
|
hlen -= 4; /* subtract common header size */
|
|
obj_tptr = (const uint8_t *)ext_dp->icmp_ext_data;
|
|
|
|
while (hlen > sizeof(struct icmp_multipart_ext_object_header_t)) {
|
|
|
|
icmp_multipart_ext_object_header = (const struct icmp_multipart_ext_object_header_t *)obj_tptr;
|
|
ND_TCHECK_SIZE(icmp_multipart_ext_object_header);
|
|
obj_tlen = GET_BE_U_2(icmp_multipart_ext_object_header->length);
|
|
obj_class_num = GET_U_1(icmp_multipart_ext_object_header->class_num);
|
|
obj_ctype = GET_U_1(icmp_multipart_ext_object_header->ctype);
|
|
obj_tptr += sizeof(struct icmp_multipart_ext_object_header_t);
|
|
|
|
ND_PRINT("\n\t %s Object (%u), Class-Type: %u, length %u",
|
|
tok2str(icmp_multipart_ext_obj_values,"unknown",obj_class_num),
|
|
obj_class_num,
|
|
obj_ctype,
|
|
obj_tlen);
|
|
|
|
hlen-=sizeof(struct icmp_multipart_ext_object_header_t); /* length field includes tlv header */
|
|
|
|
/* infinite loop protection */
|
|
if ((obj_class_num == 0) ||
|
|
(obj_tlen < sizeof(struct icmp_multipart_ext_object_header_t))) {
|
|
return;
|
|
}
|
|
obj_tlen-=sizeof(struct icmp_multipart_ext_object_header_t);
|
|
|
|
switch (obj_class_num) {
|
|
case MPLS_STACK_ENTRY_OBJECT_CLASS:
|
|
switch(obj_ctype) {
|
|
case 1:
|
|
raw_label = GET_BE_U_4(obj_tptr);
|
|
ND_PRINT("\n\t label %u, tc %u", MPLS_LABEL(raw_label), MPLS_TC(raw_label));
|
|
if (MPLS_STACK(raw_label))
|
|
ND_PRINT(", [S]");
|
|
ND_PRINT(", ttl %u", MPLS_TTL(raw_label));
|
|
break;
|
|
default:
|
|
print_unknown_data(ndo, obj_tptr, "\n\t ", obj_tlen);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
print_unknown_data(ndo, obj_tptr, "\n\t ", obj_tlen);
|
|
break;
|
|
}
|
|
if (hlen < obj_tlen)
|
|
break;
|
|
hlen -= obj_tlen;
|
|
obj_tptr += obj_tlen;
|
|
}
|
|
}
|
|
|
|
return;
|
|
trunc:
|
|
nd_print_trunc(ndo);
|
|
}
|