1/*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994, 1995, 1996
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
| 1/*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994, 1995, 1996
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
|
21 * $FreeBSD: head/contrib/tcpdump/print-icmp.c 111729 2003-03-02 08:25:48Z fenner $
| 21 * $FreeBSD: head/contrib/tcpdump/print-icmp.c 127675 2004-03-31 14:57:24Z bms $
|
22 */
23
24#ifndef lint
| 22 */
23
24#ifndef lint
|
25static const char rcsid[] =
26 "@(#) $Header: /tcpdump/master/tcpdump/print-icmp.c,v 1.62.4.1 2002/06/01 23:51:13 guy Exp $ (LBL)";
| 25static const char rcsid[] _U_ =
26 "@(#) $Header: /tcpdump/master/tcpdump/print-icmp.c,v 1.73.2.3 2004/03/24 00:56:34 guy Exp $ (LBL)";
|
27#endif
28
29#ifdef HAVE_CONFIG_H
30#include "config.h"
31#endif
32
| 27#endif
28
29#ifdef HAVE_CONFIG_H
30#include "config.h"
31#endif
32
|
33#include <sys/param.h>
34#include <sys/time.h>
35#include <sys/socket.h>
| 33#include <tcpdump-stdinc.h>
|
36
| 34
|
37#include <netinet/in.h>
38
| |
39#include <stdio.h>
40#include <string.h>
| 35#include <stdio.h>
36#include <string.h>
|
41#include <netdb.h> /* for MAXHOSTNAMELEN on some platforms */
| |
42
43#include "interface.h"
44#include "addrtoname.h"
45#include "extract.h" /* must come after interface.h */
46
47#include "ip.h"
48#include "udp.h"
| 37
38#include "interface.h"
39#include "addrtoname.h"
40#include "extract.h" /* must come after interface.h */
41
42#include "ip.h"
43#include "udp.h"
|
| 44#include "ipproto.h"
|
49
50/*
51 * Interface Control Message Protocol Definitions.
52 * Per RFC 792, September 1981.
53 */
54
55/*
56 * Structure of an icmp header.
57 */
58struct icmp {
59 u_int8_t icmp_type; /* type of message, see below */
60 u_int8_t icmp_code; /* type sub code */
61 u_int16_t icmp_cksum; /* ones complement cksum of struct */
62 union {
63 u_int8_t ih_pptr; /* ICMP_PARAMPROB */
64 struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
65 struct ih_idseq {
66 u_int16_t icd_id;
67 u_int16_t icd_seq;
68 } ih_idseq;
69 u_int32_t ih_void;
70
71 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
72 struct ih_pmtu {
| 45
46/*
47 * Interface Control Message Protocol Definitions.
48 * Per RFC 792, September 1981.
49 */
50
51/*
52 * Structure of an icmp header.
53 */
54struct icmp {
55 u_int8_t icmp_type; /* type of message, see below */
56 u_int8_t icmp_code; /* type sub code */
57 u_int16_t icmp_cksum; /* ones complement cksum of struct */
58 union {
59 u_int8_t ih_pptr; /* ICMP_PARAMPROB */
60 struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
61 struct ih_idseq {
62 u_int16_t icd_id;
63 u_int16_t icd_seq;
64 } ih_idseq;
65 u_int32_t ih_void;
66
67 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
68 struct ih_pmtu {
|
73 u_int16_t ipm_void;
| 69 u_int16_t ipm_void;
|
74 u_int16_t ipm_nextmtu;
75 } ih_pmtu;
76 } icmp_hun;
77#define icmp_pptr icmp_hun.ih_pptr
78#define icmp_gwaddr icmp_hun.ih_gwaddr
79#define icmp_id icmp_hun.ih_idseq.icd_id
80#define icmp_seq icmp_hun.ih_idseq.icd_seq
81#define icmp_void icmp_hun.ih_void
82#define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void
83#define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu
84 union {
85 struct id_ts {
86 u_int32_t its_otime;
87 u_int32_t its_rtime;
88 u_int32_t its_ttime;
89 } id_ts;
90 struct id_ip {
91 struct ip idi_ip;
92 /* options and then 64 bits of data */
93 } id_ip;
94 u_int32_t id_mask;
95 u_int8_t id_data[1];
96 } icmp_dun;
97#define icmp_otime icmp_dun.id_ts.its_otime
98#define icmp_rtime icmp_dun.id_ts.its_rtime
99#define icmp_ttime icmp_dun.id_ts.its_ttime
100#define icmp_ip icmp_dun.id_ip.idi_ip
101#define icmp_mask icmp_dun.id_mask
102#define icmp_data icmp_dun.id_data
103};
104
105/*
106 * Lower bounds on packet lengths for various types.
107 * For the error advice packets must first insure that the
108 * packet is large enought to contain the returned ip header.
109 * Only then can we do the check to see if 64 bits of packet
110 * data have been returned, since we need to check the returned
111 * ip header length.
112 */
113#define ICMP_MINLEN 8 /* abs minimum */
114#define ICMP_TSLEN (8 + 3 * sizeof (u_int32_t)) /* timestamp */
115#define ICMP_MASKLEN 12 /* address mask */
116#define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
117#define ICMP_ADVLEN(p) (8 + (IP_HL(&(p)->icmp_ip) << 2) + 8)
118 /* N.B.: must separately check that ip_hl >= 5 */
119
120/*
121 * Definition of type and code field values.
122 */
123#define ICMP_ECHOREPLY 0 /* echo reply */
124#define ICMP_UNREACH 3 /* dest unreachable, codes: */
125#define ICMP_UNREACH_NET 0 /* bad net */
126#define ICMP_UNREACH_HOST 1 /* bad host */
127#define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
128#define ICMP_UNREACH_PORT 3 /* bad port */
129#define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
130#define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
131#define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */
132#define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */
133#define ICMP_UNREACH_ISOLATED 8 /* src host isolated */
134#define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */
135#define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */
136#define ICMP_UNREACH_TOSNET 11 /* bad tos for net */
137#define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */
138#define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */
139#define ICMP_REDIRECT 5 /* shorter route, codes: */
140#define ICMP_REDIRECT_NET 0 /* for network */
141#define ICMP_REDIRECT_HOST 1 /* for host */
142#define ICMP_REDIRECT_TOSNET 2 /* for tos and net */
143#define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */
144#define ICMP_ECHO 8 /* echo service */
145#define ICMP_ROUTERADVERT 9 /* router advertisement */
146#define ICMP_ROUTERSOLICIT 10 /* router solicitation */
147#define ICMP_TIMXCEED 11 /* time exceeded, code: */
148#define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */
149#define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */
150#define ICMP_PARAMPROB 12 /* ip header bad */
151#define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */
152#define ICMP_TSTAMP 13 /* timestamp request */
153#define ICMP_TSTAMPREPLY 14 /* timestamp reply */
154#define ICMP_IREQ 15 /* information request */
155#define ICMP_IREQREPLY 16 /* information reply */
156#define ICMP_MASKREQ 17 /* address mask request */
157#define ICMP_MASKREPLY 18 /* address mask reply */
158
159#define ICMP_MAXTYPE 18
160
161#define ICMP_INFOTYPE(type) \
162 ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
163 (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
164 (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
165 (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
166 (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
167/* rfc1700 */
168#ifndef ICMP_UNREACH_NET_UNKNOWN
169#define ICMP_UNREACH_NET_UNKNOWN 6 /* destination net unknown */
170#endif
171#ifndef ICMP_UNREACH_HOST_UNKNOWN
172#define ICMP_UNREACH_HOST_UNKNOWN 7 /* destination host unknown */
173#endif
174#ifndef ICMP_UNREACH_ISOLATED
175#define ICMP_UNREACH_ISOLATED 8 /* source host isolated */
176#endif
177#ifndef ICMP_UNREACH_NET_PROHIB
178#define ICMP_UNREACH_NET_PROHIB 9 /* admin prohibited net */
179#endif
180#ifndef ICMP_UNREACH_HOST_PROHIB
181#define ICMP_UNREACH_HOST_PROHIB 10 /* admin prohibited host */
182#endif
183#ifndef ICMP_UNREACH_TOSNET
184#define ICMP_UNREACH_TOSNET 11 /* tos prohibited net */
185#endif
186#ifndef ICMP_UNREACH_TOSHOST
187#define ICMP_UNREACH_TOSHOST 12 /* tos prohibited host */
188#endif
189
190/* rfc1716 */
191#ifndef ICMP_UNREACH_FILTER_PROHIB
192#define ICMP_UNREACH_FILTER_PROHIB 13 /* admin prohibited filter */
193#endif
194#ifndef ICMP_UNREACH_HOST_PRECEDENCE
195#define ICMP_UNREACH_HOST_PRECEDENCE 14 /* host precedence violation */
196#endif
197#ifndef ICMP_UNREACH_PRECEDENCE_CUTOFF
198#define ICMP_UNREACH_PRECEDENCE_CUTOFF 15 /* precedence cutoff */
199#endif
200
201/* Most of the icmp types */
202static struct tok icmp2str[] = {
203 { ICMP_ECHOREPLY, "echo reply" },
204 { ICMP_SOURCEQUENCH, "source quench" },
205 { ICMP_ECHO, "echo request" },
206 { ICMP_ROUTERSOLICIT, "router solicitation" },
207 { ICMP_TSTAMP, "time stamp request" },
208 { ICMP_TSTAMPREPLY, "time stamp reply" },
209 { ICMP_IREQ, "information request" },
210 { ICMP_IREQREPLY, "information reply" },
211 { ICMP_MASKREQ, "address mask request" },
212 { 0, NULL }
213};
214
215/* Formats for most of the ICMP_UNREACH codes */
216static struct tok unreach2str[] = {
217 { ICMP_UNREACH_NET, "net %s unreachable" },
218 { ICMP_UNREACH_HOST, "host %s unreachable" },
219 { ICMP_UNREACH_SRCFAIL,
220 "%s unreachable - source route failed" },
221 { ICMP_UNREACH_NET_UNKNOWN, "net %s unreachable - unknown" },
222 { ICMP_UNREACH_HOST_UNKNOWN, "host %s unreachable - unknown" },
223 { ICMP_UNREACH_ISOLATED,
224 "%s unreachable - source host isolated" },
225 { ICMP_UNREACH_NET_PROHIB,
226 "net %s unreachable - admin prohibited" },
227 { ICMP_UNREACH_HOST_PROHIB,
228 "host %s unreachable - admin prohibited" },
229 { ICMP_UNREACH_TOSNET,
230 "net %s unreachable - tos prohibited" },
231 { ICMP_UNREACH_TOSHOST,
232 "host %s unreachable - tos prohibited" },
233 { ICMP_UNREACH_FILTER_PROHIB,
234 "host %s unreachable - admin prohibited filter" },
235 { ICMP_UNREACH_HOST_PRECEDENCE,
236 "host %s unreachable - host precedence violation" },
237 { ICMP_UNREACH_PRECEDENCE_CUTOFF,
238 "host %s unreachable - precedence cutoff" },
239 { 0, NULL }
240};
241
242/* Formats for the ICMP_REDIRECT codes */
243static struct tok type2str[] = {
244 { ICMP_REDIRECT_NET, "redirect %s to net %s" },
245 { ICMP_REDIRECT_HOST, "redirect %s to host %s" },
246 { ICMP_REDIRECT_TOSNET, "redirect-tos %s to net %s" },
247 { ICMP_REDIRECT_TOSHOST, "redirect-tos %s to host %s" },
248 { 0, NULL }
249};
250
251/* rfc1191 */
252struct mtu_discovery {
253 u_int16_t unused;
254 u_int16_t nexthopmtu;
255};
256
257/* rfc1256 */
258struct ih_rdiscovery {
259 u_int8_t ird_addrnum;
260 u_int8_t ird_addrsiz;
261 u_int16_t ird_lifetime;
262};
263
264struct id_rdiscovery {
265 u_int32_t ird_addr;
266 u_int32_t ird_pref;
267};
268
269void
| 70 u_int16_t ipm_nextmtu;
71 } ih_pmtu;
72 } icmp_hun;
73#define icmp_pptr icmp_hun.ih_pptr
74#define icmp_gwaddr icmp_hun.ih_gwaddr
75#define icmp_id icmp_hun.ih_idseq.icd_id
76#define icmp_seq icmp_hun.ih_idseq.icd_seq
77#define icmp_void icmp_hun.ih_void
78#define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void
79#define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu
80 union {
81 struct id_ts {
82 u_int32_t its_otime;
83 u_int32_t its_rtime;
84 u_int32_t its_ttime;
85 } id_ts;
86 struct id_ip {
87 struct ip idi_ip;
88 /* options and then 64 bits of data */
89 } id_ip;
90 u_int32_t id_mask;
91 u_int8_t id_data[1];
92 } icmp_dun;
93#define icmp_otime icmp_dun.id_ts.its_otime
94#define icmp_rtime icmp_dun.id_ts.its_rtime
95#define icmp_ttime icmp_dun.id_ts.its_ttime
96#define icmp_ip icmp_dun.id_ip.idi_ip
97#define icmp_mask icmp_dun.id_mask
98#define icmp_data icmp_dun.id_data
99};
100
101/*
102 * Lower bounds on packet lengths for various types.
103 * For the error advice packets must first insure that the
104 * packet is large enought to contain the returned ip header.
105 * Only then can we do the check to see if 64 bits of packet
106 * data have been returned, since we need to check the returned
107 * ip header length.
108 */
109#define ICMP_MINLEN 8 /* abs minimum */
110#define ICMP_TSLEN (8 + 3 * sizeof (u_int32_t)) /* timestamp */
111#define ICMP_MASKLEN 12 /* address mask */
112#define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
113#define ICMP_ADVLEN(p) (8 + (IP_HL(&(p)->icmp_ip) << 2) + 8)
114 /* N.B.: must separately check that ip_hl >= 5 */
115
116/*
117 * Definition of type and code field values.
118 */
119#define ICMP_ECHOREPLY 0 /* echo reply */
120#define ICMP_UNREACH 3 /* dest unreachable, codes: */
121#define ICMP_UNREACH_NET 0 /* bad net */
122#define ICMP_UNREACH_HOST 1 /* bad host */
123#define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
124#define ICMP_UNREACH_PORT 3 /* bad port */
125#define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
126#define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
127#define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */
128#define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */
129#define ICMP_UNREACH_ISOLATED 8 /* src host isolated */
130#define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */
131#define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */
132#define ICMP_UNREACH_TOSNET 11 /* bad tos for net */
133#define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */
134#define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */
135#define ICMP_REDIRECT 5 /* shorter route, codes: */
136#define ICMP_REDIRECT_NET 0 /* for network */
137#define ICMP_REDIRECT_HOST 1 /* for host */
138#define ICMP_REDIRECT_TOSNET 2 /* for tos and net */
139#define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */
140#define ICMP_ECHO 8 /* echo service */
141#define ICMP_ROUTERADVERT 9 /* router advertisement */
142#define ICMP_ROUTERSOLICIT 10 /* router solicitation */
143#define ICMP_TIMXCEED 11 /* time exceeded, code: */
144#define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */
145#define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */
146#define ICMP_PARAMPROB 12 /* ip header bad */
147#define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */
148#define ICMP_TSTAMP 13 /* timestamp request */
149#define ICMP_TSTAMPREPLY 14 /* timestamp reply */
150#define ICMP_IREQ 15 /* information request */
151#define ICMP_IREQREPLY 16 /* information reply */
152#define ICMP_MASKREQ 17 /* address mask request */
153#define ICMP_MASKREPLY 18 /* address mask reply */
154
155#define ICMP_MAXTYPE 18
156
157#define ICMP_INFOTYPE(type) \
158 ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
159 (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
160 (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
161 (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
162 (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
163/* rfc1700 */
164#ifndef ICMP_UNREACH_NET_UNKNOWN
165#define ICMP_UNREACH_NET_UNKNOWN 6 /* destination net unknown */
166#endif
167#ifndef ICMP_UNREACH_HOST_UNKNOWN
168#define ICMP_UNREACH_HOST_UNKNOWN 7 /* destination host unknown */
169#endif
170#ifndef ICMP_UNREACH_ISOLATED
171#define ICMP_UNREACH_ISOLATED 8 /* source host isolated */
172#endif
173#ifndef ICMP_UNREACH_NET_PROHIB
174#define ICMP_UNREACH_NET_PROHIB 9 /* admin prohibited net */
175#endif
176#ifndef ICMP_UNREACH_HOST_PROHIB
177#define ICMP_UNREACH_HOST_PROHIB 10 /* admin prohibited host */
178#endif
179#ifndef ICMP_UNREACH_TOSNET
180#define ICMP_UNREACH_TOSNET 11 /* tos prohibited net */
181#endif
182#ifndef ICMP_UNREACH_TOSHOST
183#define ICMP_UNREACH_TOSHOST 12 /* tos prohibited host */
184#endif
185
186/* rfc1716 */
187#ifndef ICMP_UNREACH_FILTER_PROHIB
188#define ICMP_UNREACH_FILTER_PROHIB 13 /* admin prohibited filter */
189#endif
190#ifndef ICMP_UNREACH_HOST_PRECEDENCE
191#define ICMP_UNREACH_HOST_PRECEDENCE 14 /* host precedence violation */
192#endif
193#ifndef ICMP_UNREACH_PRECEDENCE_CUTOFF
194#define ICMP_UNREACH_PRECEDENCE_CUTOFF 15 /* precedence cutoff */
195#endif
196
197/* Most of the icmp types */
198static struct tok icmp2str[] = {
199 { ICMP_ECHOREPLY, "echo reply" },
200 { ICMP_SOURCEQUENCH, "source quench" },
201 { ICMP_ECHO, "echo request" },
202 { ICMP_ROUTERSOLICIT, "router solicitation" },
203 { ICMP_TSTAMP, "time stamp request" },
204 { ICMP_TSTAMPREPLY, "time stamp reply" },
205 { ICMP_IREQ, "information request" },
206 { ICMP_IREQREPLY, "information reply" },
207 { ICMP_MASKREQ, "address mask request" },
208 { 0, NULL }
209};
210
211/* Formats for most of the ICMP_UNREACH codes */
212static struct tok unreach2str[] = {
213 { ICMP_UNREACH_NET, "net %s unreachable" },
214 { ICMP_UNREACH_HOST, "host %s unreachable" },
215 { ICMP_UNREACH_SRCFAIL,
216 "%s unreachable - source route failed" },
217 { ICMP_UNREACH_NET_UNKNOWN, "net %s unreachable - unknown" },
218 { ICMP_UNREACH_HOST_UNKNOWN, "host %s unreachable - unknown" },
219 { ICMP_UNREACH_ISOLATED,
220 "%s unreachable - source host isolated" },
221 { ICMP_UNREACH_NET_PROHIB,
222 "net %s unreachable - admin prohibited" },
223 { ICMP_UNREACH_HOST_PROHIB,
224 "host %s unreachable - admin prohibited" },
225 { ICMP_UNREACH_TOSNET,
226 "net %s unreachable - tos prohibited" },
227 { ICMP_UNREACH_TOSHOST,
228 "host %s unreachable - tos prohibited" },
229 { ICMP_UNREACH_FILTER_PROHIB,
230 "host %s unreachable - admin prohibited filter" },
231 { ICMP_UNREACH_HOST_PRECEDENCE,
232 "host %s unreachable - host precedence violation" },
233 { ICMP_UNREACH_PRECEDENCE_CUTOFF,
234 "host %s unreachable - precedence cutoff" },
235 { 0, NULL }
236};
237
238/* Formats for the ICMP_REDIRECT codes */
239static struct tok type2str[] = {
240 { ICMP_REDIRECT_NET, "redirect %s to net %s" },
241 { ICMP_REDIRECT_HOST, "redirect %s to host %s" },
242 { ICMP_REDIRECT_TOSNET, "redirect-tos %s to net %s" },
243 { ICMP_REDIRECT_TOSHOST, "redirect-tos %s to host %s" },
244 { 0, NULL }
245};
246
247/* rfc1191 */
248struct mtu_discovery {
249 u_int16_t unused;
250 u_int16_t nexthopmtu;
251};
252
253/* rfc1256 */
254struct ih_rdiscovery {
255 u_int8_t ird_addrnum;
256 u_int8_t ird_addrsiz;
257 u_int16_t ird_lifetime;
258};
259
260struct id_rdiscovery {
261 u_int32_t ird_addr;
262 u_int32_t ird_pref;
263};
264
265void
|
270icmp_print(const u_char *bp, u_int plen, const u_char *bp2)
| 266icmp_print(const u_char *bp, u_int plen, const u_char *bp2, int fragmented)
|
271{
272 char *cp;
273 const struct icmp *dp;
274 const struct ip *ip;
275 const char *str, *fmt;
276 const struct ip *oip;
277 const struct udphdr *ouh;
278 u_int hlen, dport, mtu;
279 char buf[MAXHOSTNAMELEN + 100];
280
281 dp = (struct icmp *)bp;
282 ip = (struct ip *)bp2;
283 str = buf;
284
285 TCHECK(dp->icmp_code);
286 switch (dp->icmp_type) {
287
| 267{
268 char *cp;
269 const struct icmp *dp;
270 const struct ip *ip;
271 const char *str, *fmt;
272 const struct ip *oip;
273 const struct udphdr *ouh;
274 u_int hlen, dport, mtu;
275 char buf[MAXHOSTNAMELEN + 100];
276
277 dp = (struct icmp *)bp;
278 ip = (struct ip *)bp2;
279 str = buf;
280
281 TCHECK(dp->icmp_code);
282 switch (dp->icmp_type) {
283
|
| 284 case ICMP_ECHO:
285 case ICMP_ECHOREPLY:
286 TCHECK(dp->icmp_seq);
287 (void)snprintf(buf, sizeof(buf), "echo %s seq %u",
288 dp->icmp_type == ICMP_ECHO ?
289 "request" : "reply",
290 EXTRACT_16BITS(&dp->icmp_seq));
291 break;
292
|
288 case ICMP_UNREACH:
289 TCHECK(dp->icmp_ip.ip_dst);
290 switch (dp->icmp_code) {
291
292 case ICMP_UNREACH_PROTOCOL:
293 TCHECK(dp->icmp_ip.ip_p);
294 (void)snprintf(buf, sizeof(buf),
295 "%s protocol %d unreachable",
296 ipaddr_string(&dp->icmp_ip.ip_dst),
297 dp->icmp_ip.ip_p);
298 break;
299
300 case ICMP_UNREACH_PORT:
301 TCHECK(dp->icmp_ip.ip_p);
302 oip = &dp->icmp_ip;
303 hlen = IP_HL(oip) * 4;
304 ouh = (struct udphdr *)(((u_char *)oip) + hlen);
| 293 case ICMP_UNREACH:
294 TCHECK(dp->icmp_ip.ip_dst);
295 switch (dp->icmp_code) {
296
297 case ICMP_UNREACH_PROTOCOL:
298 TCHECK(dp->icmp_ip.ip_p);
299 (void)snprintf(buf, sizeof(buf),
300 "%s protocol %d unreachable",
301 ipaddr_string(&dp->icmp_ip.ip_dst),
302 dp->icmp_ip.ip_p);
303 break;
304
305 case ICMP_UNREACH_PORT:
306 TCHECK(dp->icmp_ip.ip_p);
307 oip = &dp->icmp_ip;
308 hlen = IP_HL(oip) * 4;
309 ouh = (struct udphdr *)(((u_char *)oip) + hlen);
|
305 dport = ntohs(ouh->uh_dport);
| 310 TCHECK(ouh->uh_dport);
311 dport = EXTRACT_16BITS(&ouh->uh_dport);
|
306 switch (oip->ip_p) {
307
308 case IPPROTO_TCP:
309 (void)snprintf(buf, sizeof(buf),
310 "%s tcp port %s unreachable",
311 ipaddr_string(&oip->ip_dst),
312 tcpport_string(dport));
313 break;
314
315 case IPPROTO_UDP:
316 (void)snprintf(buf, sizeof(buf),
317 "%s udp port %s unreachable",
318 ipaddr_string(&oip->ip_dst),
319 udpport_string(dport));
320 break;
321
322 default:
323 (void)snprintf(buf, sizeof(buf),
324 "%s protocol %d port %d unreachable",
325 ipaddr_string(&oip->ip_dst),
326 oip->ip_p, dport);
327 break;
328 }
329 break;
330
331 case ICMP_UNREACH_NEEDFRAG:
332 {
333 register const struct mtu_discovery *mp;
334 mp = (struct mtu_discovery *)&dp->icmp_void;
335 mtu = EXTRACT_16BITS(&mp->nexthopmtu);
336 if (mtu) {
337 (void)snprintf(buf, sizeof(buf),
338 "%s unreachable - need to frag (mtu %d)",
339 ipaddr_string(&dp->icmp_ip.ip_dst), mtu);
340 } else {
341 (void)snprintf(buf, sizeof(buf),
342 "%s unreachable - need to frag",
343 ipaddr_string(&dp->icmp_ip.ip_dst));
344 }
345 }
346 break;
347
348 default:
349 fmt = tok2str(unreach2str, "#%d %%s unreachable",
350 dp->icmp_code);
351 (void)snprintf(buf, sizeof(buf), fmt,
352 ipaddr_string(&dp->icmp_ip.ip_dst));
353 break;
354 }
355 break;
356
357 case ICMP_REDIRECT:
358 TCHECK(dp->icmp_ip.ip_dst);
359 fmt = tok2str(type2str, "redirect-#%d %%s to net %%s",
360 dp->icmp_code);
361 (void)snprintf(buf, sizeof(buf), fmt,
362 ipaddr_string(&dp->icmp_ip.ip_dst),
363 ipaddr_string(&dp->icmp_gwaddr));
364 break;
365
366 case ICMP_ROUTERADVERT:
367 {
368 register const struct ih_rdiscovery *ihp;
369 register const struct id_rdiscovery *idp;
370 u_int lifetime, num, size;
371
372 (void)snprintf(buf, sizeof(buf), "router advertisement");
373 cp = buf + strlen(buf);
374
375 ihp = (struct ih_rdiscovery *)&dp->icmp_void;
376 TCHECK(*ihp);
377 (void)strncpy(cp, " lifetime ", sizeof(buf) - (cp - buf));
378 cp = buf + strlen(buf);
379 lifetime = EXTRACT_16BITS(&ihp->ird_lifetime);
380 if (lifetime < 60) {
381 (void)snprintf(cp, sizeof(buf) - (cp - buf), "%u",
382 lifetime);
383 } else if (lifetime < 60 * 60) {
384 (void)snprintf(cp, sizeof(buf) - (cp - buf), "%u:%02u",
385 lifetime / 60, lifetime % 60);
386 } else {
387 (void)snprintf(cp, sizeof(buf) - (cp - buf),
388 "%u:%02u:%02u",
389 lifetime / 3600,
390 (lifetime % 3600) / 60,
391 lifetime % 60);
392 }
393 cp = buf + strlen(buf);
394
395 num = ihp->ird_addrnum;
396 (void)snprintf(cp, sizeof(buf) - (cp - buf), " %d:", num);
397 cp = buf + strlen(buf);
398
399 size = ihp->ird_addrsiz;
400 if (size != 2) {
401 (void)snprintf(cp, sizeof(buf) - (cp - buf),
402 " [size %d]", size);
403 break;
404 }
405 idp = (struct id_rdiscovery *)&dp->icmp_data;
406 while (num-- > 0) {
407 TCHECK(*idp);
408 (void)snprintf(cp, sizeof(buf) - (cp - buf), " {%s %u}",
409 ipaddr_string(&idp->ird_addr),
410 EXTRACT_32BITS(&idp->ird_pref));
411 cp = buf + strlen(buf);
412 ++idp;
413 }
414 }
415 break;
416
417 case ICMP_TIMXCEED:
418 TCHECK(dp->icmp_ip.ip_dst);
419 switch (dp->icmp_code) {
420
421 case ICMP_TIMXCEED_INTRANS:
422 str = "time exceeded in-transit";
423 break;
424
425 case ICMP_TIMXCEED_REASS:
426 str = "ip reassembly time exceeded";
427 break;
428
429 default:
430 (void)snprintf(buf, sizeof(buf), "time exceeded-#%d",
431 dp->icmp_code);
432 break;
433 }
434 break;
435
436 case ICMP_PARAMPROB:
437 if (dp->icmp_code)
438 (void)snprintf(buf, sizeof(buf),
439 "parameter problem - code %d", dp->icmp_code);
440 else {
441 TCHECK(dp->icmp_pptr);
442 (void)snprintf(buf, sizeof(buf),
443 "parameter problem - octet %d", dp->icmp_pptr);
444 }
445 break;
446
447 case ICMP_MASKREPLY:
448 TCHECK(dp->icmp_mask);
449 (void)snprintf(buf, sizeof(buf), "address mask is 0x%08x",
| 312 switch (oip->ip_p) {
313
314 case IPPROTO_TCP:
315 (void)snprintf(buf, sizeof(buf),
316 "%s tcp port %s unreachable",
317 ipaddr_string(&oip->ip_dst),
318 tcpport_string(dport));
319 break;
320
321 case IPPROTO_UDP:
322 (void)snprintf(buf, sizeof(buf),
323 "%s udp port %s unreachable",
324 ipaddr_string(&oip->ip_dst),
325 udpport_string(dport));
326 break;
327
328 default:
329 (void)snprintf(buf, sizeof(buf),
330 "%s protocol %d port %d unreachable",
331 ipaddr_string(&oip->ip_dst),
332 oip->ip_p, dport);
333 break;
334 }
335 break;
336
337 case ICMP_UNREACH_NEEDFRAG:
338 {
339 register const struct mtu_discovery *mp;
340 mp = (struct mtu_discovery *)&dp->icmp_void;
341 mtu = EXTRACT_16BITS(&mp->nexthopmtu);
342 if (mtu) {
343 (void)snprintf(buf, sizeof(buf),
344 "%s unreachable - need to frag (mtu %d)",
345 ipaddr_string(&dp->icmp_ip.ip_dst), mtu);
346 } else {
347 (void)snprintf(buf, sizeof(buf),
348 "%s unreachable - need to frag",
349 ipaddr_string(&dp->icmp_ip.ip_dst));
350 }
351 }
352 break;
353
354 default:
355 fmt = tok2str(unreach2str, "#%d %%s unreachable",
356 dp->icmp_code);
357 (void)snprintf(buf, sizeof(buf), fmt,
358 ipaddr_string(&dp->icmp_ip.ip_dst));
359 break;
360 }
361 break;
362
363 case ICMP_REDIRECT:
364 TCHECK(dp->icmp_ip.ip_dst);
365 fmt = tok2str(type2str, "redirect-#%d %%s to net %%s",
366 dp->icmp_code);
367 (void)snprintf(buf, sizeof(buf), fmt,
368 ipaddr_string(&dp->icmp_ip.ip_dst),
369 ipaddr_string(&dp->icmp_gwaddr));
370 break;
371
372 case ICMP_ROUTERADVERT:
373 {
374 register const struct ih_rdiscovery *ihp;
375 register const struct id_rdiscovery *idp;
376 u_int lifetime, num, size;
377
378 (void)snprintf(buf, sizeof(buf), "router advertisement");
379 cp = buf + strlen(buf);
380
381 ihp = (struct ih_rdiscovery *)&dp->icmp_void;
382 TCHECK(*ihp);
383 (void)strncpy(cp, " lifetime ", sizeof(buf) - (cp - buf));
384 cp = buf + strlen(buf);
385 lifetime = EXTRACT_16BITS(&ihp->ird_lifetime);
386 if (lifetime < 60) {
387 (void)snprintf(cp, sizeof(buf) - (cp - buf), "%u",
388 lifetime);
389 } else if (lifetime < 60 * 60) {
390 (void)snprintf(cp, sizeof(buf) - (cp - buf), "%u:%02u",
391 lifetime / 60, lifetime % 60);
392 } else {
393 (void)snprintf(cp, sizeof(buf) - (cp - buf),
394 "%u:%02u:%02u",
395 lifetime / 3600,
396 (lifetime % 3600) / 60,
397 lifetime % 60);
398 }
399 cp = buf + strlen(buf);
400
401 num = ihp->ird_addrnum;
402 (void)snprintf(cp, sizeof(buf) - (cp - buf), " %d:", num);
403 cp = buf + strlen(buf);
404
405 size = ihp->ird_addrsiz;
406 if (size != 2) {
407 (void)snprintf(cp, sizeof(buf) - (cp - buf),
408 " [size %d]", size);
409 break;
410 }
411 idp = (struct id_rdiscovery *)&dp->icmp_data;
412 while (num-- > 0) {
413 TCHECK(*idp);
414 (void)snprintf(cp, sizeof(buf) - (cp - buf), " {%s %u}",
415 ipaddr_string(&idp->ird_addr),
416 EXTRACT_32BITS(&idp->ird_pref));
417 cp = buf + strlen(buf);
418 ++idp;
419 }
420 }
421 break;
422
423 case ICMP_TIMXCEED:
424 TCHECK(dp->icmp_ip.ip_dst);
425 switch (dp->icmp_code) {
426
427 case ICMP_TIMXCEED_INTRANS:
428 str = "time exceeded in-transit";
429 break;
430
431 case ICMP_TIMXCEED_REASS:
432 str = "ip reassembly time exceeded";
433 break;
434
435 default:
436 (void)snprintf(buf, sizeof(buf), "time exceeded-#%d",
437 dp->icmp_code);
438 break;
439 }
440 break;
441
442 case ICMP_PARAMPROB:
443 if (dp->icmp_code)
444 (void)snprintf(buf, sizeof(buf),
445 "parameter problem - code %d", dp->icmp_code);
446 else {
447 TCHECK(dp->icmp_pptr);
448 (void)snprintf(buf, sizeof(buf),
449 "parameter problem - octet %d", dp->icmp_pptr);
450 }
451 break;
452
453 case ICMP_MASKREPLY:
454 TCHECK(dp->icmp_mask);
455 (void)snprintf(buf, sizeof(buf), "address mask is 0x%08x",
|
450 (unsigned)ntohl(dp->icmp_mask));
| 456 EXTRACT_32BITS(&dp->icmp_mask));
|
451 break;
452
453 case ICMP_TSTAMP:
454 TCHECK(dp->icmp_seq);
455 (void)snprintf(buf, sizeof(buf),
456 "time stamp query id %u seq %u",
| 457 break;
458
459 case ICMP_TSTAMP:
460 TCHECK(dp->icmp_seq);
461 (void)snprintf(buf, sizeof(buf),
462 "time stamp query id %u seq %u",
|
457 (unsigned)ntohs(dp->icmp_id),
458 (unsigned)ntohs(dp->icmp_seq));
| 463 EXTRACT_16BITS(&dp->icmp_id),
464 EXTRACT_16BITS(&dp->icmp_seq));
|
459 break;
460
461 case ICMP_TSTAMPREPLY:
462 TCHECK(dp->icmp_ttime);
463 (void)snprintf(buf, sizeof(buf),
| 465 break;
466
467 case ICMP_TSTAMPREPLY:
468 TCHECK(dp->icmp_ttime);
469 (void)snprintf(buf, sizeof(buf),
|
464 "time stamp reply id %u seq %u : org 0x%lx recv 0x%lx xmit 0x%lx",
465 (unsigned)ntohs(dp->icmp_id),
466 (unsigned)ntohs(dp->icmp_seq),
467 (unsigned long)ntohl(dp->icmp_otime),
468 (unsigned long)ntohl(dp->icmp_rtime),
469 (unsigned long)ntohl(dp->icmp_ttime));
| 470 "time stamp reply id %u seq %u : org 0x%x recv 0x%x xmit 0x%x",
471 EXTRACT_16BITS(&dp->icmp_id),
472 EXTRACT_16BITS(&dp->icmp_seq),
473 EXTRACT_32BITS(&dp->icmp_otime),
474 EXTRACT_32BITS(&dp->icmp_rtime),
475 EXTRACT_32BITS(&dp->icmp_ttime));
|
470 break;
471
472 default:
473 str = tok2str(icmp2str, "type-#%d", dp->icmp_type);
474 break;
475 }
| 476 break;
477
478 default:
479 str = tok2str(icmp2str, "type-#%d", dp->icmp_type);
480 break;
481 }
|
476 (void)printf("icmp: %s", str);
477 if (vflag) {
| 482 (void)printf("icmp %d: %s", plen, str);
483 if (vflag && !fragmented) { /* don't attempt checksumming if this is a frag */
484 u_int16_t sum, icmp_sum;
|
478 if (TTEST2(*bp, plen)) {
| 485 if (TTEST2(*bp, plen)) {
|
479 if (in_cksum((u_short*)dp, plen, 0))
480 printf(" (wrong icmp csum)");
| 486 sum = in_cksum((u_short*)dp, plen, 0);
487 if (sum != 0) {
488 icmp_sum = EXTRACT_16BITS(&dp->icmp_cksum);
489 (void)printf(" (wrong icmp cksum %x (->%x)!)",
490 icmp_sum,
491 in_cksum_shouldbe(icmp_sum, sum));
492 }
|
481 }
482 }
| 493 }
494 }
|
483 if (vflag > 1 && !ICMP_INFOTYPE(dp->icmp_type)) {
484 bp += 8;
485 (void)printf(" for ");
486 ip = (struct ip *)bp;
487 snaplen = snapend - bp;
488 ip_print(bp, ntohs(ip->ip_len));
489 }
| 495 if (vflag > 1 && !ICMP_INFOTYPE(dp->icmp_type)) {
496 bp += 8;
497 (void)printf(" for ");
498 ip = (struct ip *)bp;
499 snaplen = snapend - bp;
500 ip_print(bp, EXTRACT_16BITS(&ip->ip_len));
501 }
|
490 return;
491trunc:
492 fputs("[|icmp]", stdout);
493}
| 502 return;
503trunc:
504 fputs("[|icmp]", stdout);
505}
|