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/*
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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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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/sbuf.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/tcp.h>
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#include <netinet/udp.h>
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#include <arpa/inet.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "common.h"
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38
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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_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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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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#define ICMP_MPLS_EXT_EXTRACT_VERSION(x) (((x)&0xf0)>>4)
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#define ICMP_MPLS_EXT_VERSION 2
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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_EXTD_MINLEN (156 - sizeof (struct ip)) /* draft-bonica-internet-icmp-08 */
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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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143
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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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#define ICMP_MPLS_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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179
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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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203
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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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209
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"%s unreachable - source route failed" },
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210
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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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213
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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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217
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"host %s unreachable - admin prohibited" },
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{ ICMP_UNREACH_TOSNET,
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219
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"net %s unreachable - tos prohibited" },
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220
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{ ICMP_UNREACH_TOSHOST,
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221
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"host %s unreachable - tos prohibited" },
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222
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{ ICMP_UNREACH_FILTER_PROHIB,
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223
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"host %s unreachable - admin prohibited filter" },
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224
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{ ICMP_UNREACH_HOST_PRECEDENCE,
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225
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"host %s unreachable - host precedence violation" },
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226
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{ ICMP_UNREACH_PRECEDENCE_CUTOFF,
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227
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"host %s unreachable - precedence cutoff" },
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228
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{ 0, NULL }
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229
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};
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230
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231
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/* Formats for the ICMP_REDIRECT codes */
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232
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static struct tok type2str[] = {
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233
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{ ICMP_REDIRECT_NET, "redirect %s to net %s" },
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234
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{ ICMP_REDIRECT_HOST, "redirect %s to host %s" },
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235
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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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237
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{ 0, NULL }
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238
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};
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239
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240
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/* rfc1191 */
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241
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struct mtu_discovery {
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242
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u_int16_t unused;
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243
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u_int16_t nexthopmtu;
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244
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};
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245
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246
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/* rfc1256 */
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247
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struct ih_rdiscovery {
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248
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u_int8_t ird_addrnum;
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249
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u_int8_t ird_addrsiz;
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250
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u_int16_t ird_lifetime;
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251
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};
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252
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253
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struct id_rdiscovery {
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254
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u_int32_t ird_addr;
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255
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u_int32_t ird_pref;
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256
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};
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257
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258
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/*
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259
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* draft-bonica-internet-icmp-08
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260
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*
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261
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* The Destination Unreachable, Time Exceeded
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262
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* and Parameter Problem messages are slighly changed as per
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263
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* the above draft. A new Length field gets added to give
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264
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* the caller an idea about the length of the piggypacked
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265
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* IP packet before the MPLS extension header starts.
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266
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*
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267
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* The Length field represents length of the padded "original datagram"
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268
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* field measured in 32-bit words.
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269
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*
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270
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* 0 1 2 3
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271
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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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272
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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273
|
* | Type | Code | Checksum |
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274
|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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275
|
* | unused | Length | unused |
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276
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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277
|
* | Internet Header + leading octets of original datagram |
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278
|
* | |
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279
|
* | // |
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280
|
* | |
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281
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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282
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*/
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283
|
|
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284
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struct icmp_ext_t {
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285
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u_int8_t icmp_type;
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286
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u_int8_t icmp_code;
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287
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u_int8_t icmp_checksum[2];
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288
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u_int8_t icmp_reserved;
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289
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u_int8_t icmp_length;
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290
|
u_int8_t icmp_reserved2[2];
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291
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u_int8_t icmp_ext_legacy_header[128]; /* extension header starts 128 bytes after ICMP header */
|
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292
|
u_int8_t icmp_ext_version_res[2];
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293
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u_int8_t icmp_ext_checksum[2];
|
|
294
|
u_int8_t icmp_ext_data[1];
|
|
295
|
};
|
|
296
|
|
|
297
|
struct icmp_mpls_ext_object_header_t {
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|
298
|
u_int8_t length[2];
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|
299
|
u_int8_t class_num;
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300
|
u_int8_t ctype;
|
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301
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};
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|
302
|
|
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303
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static const struct tok icmp_mpls_ext_obj_values[] = {
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304
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{ 1, "MPLS Stack Entry" },
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305
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{ 2, "Extended Payload" },
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306
|
{ 0, NULL}
|
|
307
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};
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|
308
|
|
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309
|
/* prototypes */
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310
|
const char *icmp_tstamp_print(u_int);
|
|
311
|
|
|
312
|
/* print the milliseconds since midnight UTC */
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|
313
|
const char *
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314
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icmp_tstamp_print(u_int tstamp) {
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|
315
|
u_int msec,sec,min,hrs;
|
|
316
|
|
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317
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static char buf[64];
|
|
318
|
|
|
319
|
msec = tstamp % 1000;
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320
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sec = tstamp / 1000;
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321
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min = sec / 60; sec -= min * 60;
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322
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hrs = min / 60; min -= hrs * 60;
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323
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snprintf(buf, sizeof(buf), "%02u:%02u:%02u.%03u",hrs,min,sec,msec);
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|
324
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return buf;
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|
325
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}
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326
|
|
|
327
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void
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|
328
|
icmp_print(struct sbuf *sbuf, const u_char *bp, u_int plen, const u_char *bp2, int fragmented __unused)
|
|
329
|
{
|
|
330
|
const struct icmp *dp;
|
|
331
|
const struct ip *ip;
|
|
332
|
const struct ip *oip;
|
|
333
|
const struct udphdr *ouh;
|
|
334
|
u_int hlen, dport, mtu;
|
|
335
|
|
|
336
|
dp = (const struct icmp *)bp;
|
|
337
|
ip = (const struct ip *)bp2;
|
|
338
|
|
|
339
|
switch (dp->icmp_type) {
|
|
340
|
case ICMP_ECHO:
|
|
341
|
case ICMP_ECHOREPLY:
|
|
342
|
sbuf_printf(sbuf, "%s,%u,%u",
|
|
343
|
dp->icmp_type == ICMP_ECHO ?
|
|
344
|
"request" : "reply",
|
|
345
|
EXTRACT_16BITS(&dp->icmp_id),
|
|
346
|
EXTRACT_16BITS(&dp->icmp_seq));
|
|
347
|
break;
|
|
348
|
|
|
349
|
case ICMP_UNREACH:
|
|
350
|
switch (dp->icmp_code) {
|
|
351
|
case ICMP_UNREACH_PROTOCOL:
|
|
352
|
sbuf_printf(sbuf,
|
|
353
|
"unreachproto,%s,%d",
|
|
354
|
inet_ntoa(dp->icmp_ip.ip_dst),
|
|
355
|
dp->icmp_ip.ip_p);
|
|
356
|
break;
|
|
357
|
|
|
358
|
case ICMP_UNREACH_PORT:
|
|
359
|
oip = &dp->icmp_ip;
|
|
360
|
hlen = IP_HL(oip) * 4;
|
|
361
|
ouh = (const struct udphdr *)(((const u_char *)oip) + hlen);
|
|
362
|
dport = EXTRACT_16BITS(&ouh->uh_dport);
|
|
363
|
sbuf_printf(sbuf, "unreachport,");
|
|
364
|
switch (oip->ip_p) {
|
|
365
|
case IPPROTO_TCP:
|
|
366
|
sbuf_printf(sbuf,
|
|
367
|
"%s,TCP,%u",
|
|
368
|
inet_ntoa(oip->ip_dst),
|
|
369
|
dport);
|
|
370
|
break;
|
|
371
|
|
|
372
|
case IPPROTO_UDP:
|
|
373
|
sbuf_printf(sbuf,
|
|
374
|
"%s,UDP,%u",
|
|
375
|
inet_ntoa(oip->ip_dst),
|
|
376
|
dport);
|
|
377
|
break;
|
|
378
|
|
|
379
|
default:
|
|
380
|
sbuf_printf(sbuf,
|
|
381
|
"%s,%d,%d",
|
|
382
|
inet_ntoa(oip->ip_dst),
|
|
383
|
oip->ip_p, dport);
|
|
384
|
break;
|
|
385
|
}
|
|
386
|
break;
|
|
387
|
|
|
388
|
case ICMP_UNREACH_NEEDFRAG:
|
|
389
|
{
|
|
390
|
register const struct mtu_discovery *mp;
|
|
391
|
mp = (const struct mtu_discovery *)(const u_char *)&dp->icmp_void;
|
|
392
|
mtu = EXTRACT_16BITS(&mp->nexthopmtu);
|
|
393
|
if (mtu) {
|
|
394
|
sbuf_printf(sbuf,
|
|
395
|
"needfrag,%s,%d",
|
|
396
|
inet_ntoa(dp->icmp_ip.ip_dst), mtu);
|
|
397
|
} else {
|
|
398
|
sbuf_printf(sbuf,
|
|
399
|
"needfrag,%s need to frag",
|
|
400
|
inet_ntoa(dp->icmp_ip.ip_dst));
|
|
401
|
}
|
|
402
|
}
|
|
403
|
break;
|
|
404
|
|
|
405
|
default:
|
|
406
|
sbuf_printf(sbuf, "unreach,");
|
|
407
|
sbuf_printf(sbuf, code2str(unreach2str, "%s unreachable", dp->icmp_code),
|
|
408
|
inet_ntoa(dp->icmp_ip.ip_dst));
|
|
409
|
break;
|
|
410
|
}
|
|
411
|
break;
|
|
412
|
|
|
413
|
case ICMP_REDIRECT:
|
|
414
|
sbuf_printf(sbuf, "redirect,");
|
|
415
|
sbuf_printf(sbuf, code2str(type2str, "redirect-?? %s to net %s,", dp->icmp_code),
|
|
416
|
inet_ntoa(dp->icmp_ip.ip_dst),
|
|
417
|
inet_ntoa(dp->icmp_gwaddr));
|
|
418
|
break;
|
|
419
|
|
|
420
|
case ICMP_ROUTERADVERT:
|
|
421
|
{
|
|
422
|
register const struct ih_rdiscovery *ihp;
|
|
423
|
u_int lifetime, num, size;
|
|
424
|
|
|
425
|
sbuf_printf(sbuf, "routeradv");
|
|
426
|
|
|
427
|
ihp = (const struct ih_rdiscovery *)&dp->icmp_void;
|
|
428
|
lifetime = EXTRACT_16BITS(&ihp->ird_lifetime);
|
|
429
|
if (lifetime < 60) {
|
|
430
|
sbuf_printf(sbuf, "%u,",
|
|
431
|
lifetime);
|
|
432
|
} else if (lifetime < 60 * 60) {
|
|
433
|
sbuf_printf(sbuf, "%u:%02u,",
|
|
434
|
lifetime / 60, lifetime % 60);
|
|
435
|
} else {
|
|
436
|
sbuf_printf(sbuf,
|
|
437
|
"%u:%02u:%02u,",
|
|
438
|
lifetime / 3600,
|
|
439
|
(lifetime % 3600) / 60,
|
|
440
|
lifetime % 60);
|
|
441
|
}
|
|
442
|
|
|
443
|
num = ihp->ird_addrnum;
|
|
444
|
sbuf_printf(sbuf, "%d,", num);
|
|
445
|
|
|
446
|
size = ihp->ird_addrsiz;
|
|
447
|
if (size != 2) {
|
|
448
|
sbuf_printf(sbuf,
|
|
449
|
"%d,", size);
|
|
450
|
break;
|
|
451
|
}
|
|
452
|
}
|
|
453
|
break;
|
|
454
|
|
|
455
|
case ICMP_TIMXCEED:
|
|
456
|
sbuf_printf(sbuf, "timexceed,");
|
|
457
|
switch (dp->icmp_code) {
|
|
458
|
case ICMP_TIMXCEED_INTRANS:
|
|
459
|
sbuf_printf(sbuf, "time exceeded in-transit");
|
|
460
|
break;
|
|
461
|
|
|
462
|
case ICMP_TIMXCEED_REASS:
|
|
463
|
sbuf_printf(sbuf, "ip reassembly time exceeded");
|
|
464
|
break;
|
|
465
|
|
|
466
|
default:
|
|
467
|
sbuf_printf(sbuf, "time exceeded-#%d",
|
|
468
|
dp->icmp_code);
|
|
469
|
break;
|
|
470
|
}
|
|
471
|
break;
|
|
472
|
|
|
473
|
case ICMP_PARAMPROB:
|
|
474
|
if (dp->icmp_code)
|
|
475
|
sbuf_printf(sbuf,
|
|
476
|
"paramprob, parameter problem - code %d", dp->icmp_code);
|
|
477
|
else {
|
|
478
|
sbuf_printf(sbuf,
|
|
479
|
"paramprob, parameter problem - octet %d", dp->icmp_pptr);
|
|
480
|
}
|
|
481
|
break;
|
|
482
|
|
|
483
|
case ICMP_MASKREPLY:
|
|
484
|
sbuf_printf(sbuf, "maskreply, address mask is 0x%08x",
|
|
485
|
EXTRACT_32BITS(&dp->icmp_mask));
|
|
486
|
break;
|
|
487
|
|
|
488
|
case ICMP_TSTAMP:
|
|
489
|
sbuf_printf(sbuf,
|
|
490
|
"tstamp,%u,%u",
|
|
491
|
EXTRACT_16BITS(&dp->icmp_id),
|
|
492
|
EXTRACT_16BITS(&dp->icmp_seq));
|
|
493
|
break;
|
|
494
|
|
|
495
|
case ICMP_TSTAMPREPLY:
|
|
496
|
sbuf_printf(sbuf,
|
|
497
|
"tstampreply, %u,%u,%s,",
|
|
498
|
EXTRACT_16BITS(&dp->icmp_id),
|
|
499
|
EXTRACT_16BITS(&dp->icmp_seq),
|
|
500
|
icmp_tstamp_print(EXTRACT_32BITS(&dp->icmp_otime)));
|
|
501
|
|
|
502
|
sbuf_printf(sbuf, "%s,",
|
|
503
|
icmp_tstamp_print(EXTRACT_32BITS(&dp->icmp_rtime)));
|
|
504
|
sbuf_printf(sbuf, "%s",
|
|
505
|
icmp_tstamp_print(EXTRACT_32BITS(&dp->icmp_ttime)));
|
|
506
|
break;
|
|
507
|
|
|
508
|
default:
|
|
509
|
sbuf_printf(sbuf, code2str(icmp2str, "type-??", dp->icmp_type));
|
|
510
|
break;
|
|
511
|
}
|
|
512
|
sbuf_printf(sbuf, "%u", plen);
|
|
513
|
|
|
514
|
return;
|
|
515
|
}
|