summaryrefslogtreecommitdiffstats
path: root/contrib/tcpdump/print-icmp.c
blob: 34b6c3296c366ce8c632f22f6c8542e1c7de7184 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
/*
 * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994, 1995, 1996
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * $FreeBSD$
 */

#ifndef lint
static const char rcsid[] =
    "@(#) $Header: /tcpdump/master/tcpdump/print-icmp.c,v 1.62.4.1 2002/06/01 23:51:13 guy Exp $ (LBL)";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>

#include <netinet/in.h>

#include <stdio.h>
#include <string.h>
#include <netdb.h>		/* for MAXHOSTNAMELEN on some platforms */

#include "interface.h"
#include "addrtoname.h"
#include "extract.h"			/* must come after interface.h */

#include "ip.h"
#include "udp.h"

/*
 * Interface Control Message Protocol Definitions.
 * Per RFC 792, September 1981.
 */

/*
 * Structure of an icmp header.
 */
struct icmp {
	u_int8_t  icmp_type;		/* type of message, see below */
	u_int8_t  icmp_code;		/* type sub code */
	u_int16_t icmp_cksum;		/* ones complement cksum of struct */
	union {
		u_int8_t ih_pptr;			/* ICMP_PARAMPROB */
		struct in_addr ih_gwaddr;	/* ICMP_REDIRECT */
		struct ih_idseq {
			u_int16_t icd_id;
			u_int16_t icd_seq;
		} ih_idseq;
		u_int32_t ih_void;

		/* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
		struct ih_pmtu {
			u_int16_t ipm_void;    
			u_int16_t ipm_nextmtu;
		} ih_pmtu;
	} icmp_hun;
#define	icmp_pptr	icmp_hun.ih_pptr
#define	icmp_gwaddr	icmp_hun.ih_gwaddr
#define	icmp_id		icmp_hun.ih_idseq.icd_id
#define	icmp_seq	icmp_hun.ih_idseq.icd_seq
#define	icmp_void	icmp_hun.ih_void
#define	icmp_pmvoid	icmp_hun.ih_pmtu.ipm_void
#define	icmp_nextmtu	icmp_hun.ih_pmtu.ipm_nextmtu
	union {
		struct id_ts {
			u_int32_t its_otime;
			u_int32_t its_rtime;
			u_int32_t its_ttime;
		} id_ts;
		struct id_ip  {
			struct ip idi_ip;
			/* options and then 64 bits of data */
		} id_ip;
		u_int32_t id_mask;
		u_int8_t id_data[1];
	} icmp_dun;
#define	icmp_otime	icmp_dun.id_ts.its_otime
#define	icmp_rtime	icmp_dun.id_ts.its_rtime
#define	icmp_ttime	icmp_dun.id_ts.its_ttime
#define	icmp_ip		icmp_dun.id_ip.idi_ip
#define	icmp_mask	icmp_dun.id_mask
#define	icmp_data	icmp_dun.id_data
};

/*
 * Lower bounds on packet lengths for various types.
 * For the error advice packets must first insure that the
 * packet is large enought to contain the returned ip header.
 * Only then can we do the check to see if 64 bits of packet
 * data have been returned, since we need to check the returned
 * ip header length.
 */
#define	ICMP_MINLEN	8				/* abs minimum */
#define	ICMP_TSLEN	(8 + 3 * sizeof (u_int32_t))	/* timestamp */
#define	ICMP_MASKLEN	12				/* address mask */
#define	ICMP_ADVLENMIN	(8 + sizeof (struct ip) + 8)	/* min */
#define	ICMP_ADVLEN(p)	(8 + (IP_HL(&(p)->icmp_ip) << 2) + 8)
	/* N.B.: must separately check that ip_hl >= 5 */

/*
 * Definition of type and code field values.
 */
#define	ICMP_ECHOREPLY		0		/* echo reply */
#define	ICMP_UNREACH		3		/* dest unreachable, codes: */
#define		ICMP_UNREACH_NET	0		/* bad net */
#define		ICMP_UNREACH_HOST	1		/* bad host */
#define		ICMP_UNREACH_PROTOCOL	2		/* bad protocol */
#define		ICMP_UNREACH_PORT	3		/* bad port */
#define		ICMP_UNREACH_NEEDFRAG	4		/* IP_DF caused drop */
#define		ICMP_UNREACH_SRCFAIL	5		/* src route failed */
#define		ICMP_UNREACH_NET_UNKNOWN 6		/* unknown net */
#define		ICMP_UNREACH_HOST_UNKNOWN 7		/* unknown host */
#define		ICMP_UNREACH_ISOLATED	8		/* src host isolated */
#define		ICMP_UNREACH_NET_PROHIB	9		/* prohibited access */
#define		ICMP_UNREACH_HOST_PROHIB 10		/* ditto */
#define		ICMP_UNREACH_TOSNET	11		/* bad tos for net */
#define		ICMP_UNREACH_TOSHOST	12		/* bad tos for host */
#define	ICMP_SOURCEQUENCH	4		/* packet lost, slow down */
#define	ICMP_REDIRECT		5		/* shorter route, codes: */
#define		ICMP_REDIRECT_NET	0		/* for network */
#define		ICMP_REDIRECT_HOST	1		/* for host */
#define		ICMP_REDIRECT_TOSNET	2		/* for tos and net */
#define		ICMP_REDIRECT_TOSHOST	3		/* for tos and host */
#define	ICMP_ECHO		8		/* echo service */
#define	ICMP_ROUTERADVERT	9		/* router advertisement */
#define	ICMP_ROUTERSOLICIT	10		/* router solicitation */
#define	ICMP_TIMXCEED		11		/* time exceeded, code: */
#define		ICMP_TIMXCEED_INTRANS	0		/* ttl==0 in transit */
#define		ICMP_TIMXCEED_REASS	1		/* ttl==0 in reass */
#define	ICMP_PARAMPROB		12		/* ip header bad */
#define		ICMP_PARAMPROB_OPTABSENT 1		/* req. opt. absent */
#define	ICMP_TSTAMP		13		/* timestamp request */
#define	ICMP_TSTAMPREPLY	14		/* timestamp reply */
#define	ICMP_IREQ		15		/* information request */
#define	ICMP_IREQREPLY		16		/* information reply */
#define	ICMP_MASKREQ		17		/* address mask request */
#define	ICMP_MASKREPLY		18		/* address mask reply */

#define	ICMP_MAXTYPE		18

#define	ICMP_INFOTYPE(type) \
	((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
	(type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
	(type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
	(type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
	(type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
/* rfc1700 */
#ifndef ICMP_UNREACH_NET_UNKNOWN
#define ICMP_UNREACH_NET_UNKNOWN	6	/* destination net unknown */
#endif
#ifndef ICMP_UNREACH_HOST_UNKNOWN
#define ICMP_UNREACH_HOST_UNKNOWN	7	/* destination host unknown */
#endif
#ifndef ICMP_UNREACH_ISOLATED
#define ICMP_UNREACH_ISOLATED		8	/* source host isolated */
#endif
#ifndef ICMP_UNREACH_NET_PROHIB
#define ICMP_UNREACH_NET_PROHIB		9	/* admin prohibited net */
#endif
#ifndef ICMP_UNREACH_HOST_PROHIB
#define ICMP_UNREACH_HOST_PROHIB	10	/* admin prohibited host */
#endif
#ifndef ICMP_UNREACH_TOSNET
#define ICMP_UNREACH_TOSNET		11	/* tos prohibited net */
#endif
#ifndef ICMP_UNREACH_TOSHOST
#define ICMP_UNREACH_TOSHOST		12	/* tos prohibited host */
#endif

/* rfc1716 */
#ifndef ICMP_UNREACH_FILTER_PROHIB
#define ICMP_UNREACH_FILTER_PROHIB	13	/* admin prohibited filter */
#endif
#ifndef ICMP_UNREACH_HOST_PRECEDENCE
#define ICMP_UNREACH_HOST_PRECEDENCE	14	/* host precedence violation */
#endif
#ifndef ICMP_UNREACH_PRECEDENCE_CUTOFF
#define ICMP_UNREACH_PRECEDENCE_CUTOFF	15	/* precedence cutoff */
#endif

/* Most of the icmp types */
static struct tok icmp2str[] = {
	{ ICMP_ECHOREPLY,		"echo reply" },
	{ ICMP_SOURCEQUENCH,		"source quench" },
	{ ICMP_ECHO,			"echo request" },
	{ ICMP_ROUTERSOLICIT,		"router solicitation" },
	{ ICMP_TSTAMP,			"time stamp request" },
	{ ICMP_TSTAMPREPLY,		"time stamp reply" },
	{ ICMP_IREQ,			"information request" },
	{ ICMP_IREQREPLY,		"information reply" },
	{ ICMP_MASKREQ,			"address mask request" },
	{ 0,				NULL }
};

/* Formats for most of the ICMP_UNREACH codes */
static struct tok unreach2str[] = {
	{ ICMP_UNREACH_NET,		"net %s unreachable" },
	{ ICMP_UNREACH_HOST,		"host %s unreachable" },
	{ ICMP_UNREACH_SRCFAIL,
	    "%s unreachable - source route failed" },
	{ ICMP_UNREACH_NET_UNKNOWN,	"net %s unreachable - unknown" },
	{ ICMP_UNREACH_HOST_UNKNOWN,	"host %s unreachable - unknown" },
	{ ICMP_UNREACH_ISOLATED,
	    "%s unreachable - source host isolated" },
	{ ICMP_UNREACH_NET_PROHIB,
	    "net %s unreachable - admin prohibited" },
	{ ICMP_UNREACH_HOST_PROHIB,
	    "host %s unreachable - admin prohibited" },
	{ ICMP_UNREACH_TOSNET,
	    "net %s unreachable - tos prohibited" },
	{ ICMP_UNREACH_TOSHOST,
	    "host %s unreachable - tos prohibited" },
	{ ICMP_UNREACH_FILTER_PROHIB,
	    "host %s unreachable - admin prohibited filter" },
	{ ICMP_UNREACH_HOST_PRECEDENCE,
	    "host %s unreachable - host precedence violation" },
	{ ICMP_UNREACH_PRECEDENCE_CUTOFF,
	    "host %s unreachable - precedence cutoff" },
	{ 0,				NULL }
};

/* Formats for the ICMP_REDIRECT codes */
static struct tok type2str[] = {
	{ ICMP_REDIRECT_NET,		"redirect %s to net %s" },
	{ ICMP_REDIRECT_HOST,		"redirect %s to host %s" },
	{ ICMP_REDIRECT_TOSNET,		"redirect-tos %s to net %s" },
	{ ICMP_REDIRECT_TOSHOST,	"redirect-tos %s to host %s" },
	{ 0,				NULL }
};

/* rfc1191 */
struct mtu_discovery {
	u_int16_t unused;
	u_int16_t nexthopmtu;
};

/* rfc1256 */
struct ih_rdiscovery {
	u_int8_t ird_addrnum;
	u_int8_t ird_addrsiz;
	u_int16_t ird_lifetime;
};

struct id_rdiscovery {
	u_int32_t ird_addr;
	u_int32_t ird_pref;
};

void
icmp_print(const u_char *bp, u_int plen, const u_char *bp2)
{
	char *cp;
	const struct icmp *dp;
	const struct ip *ip;
	const char *str, *fmt;
	const struct ip *oip;
	const struct udphdr *ouh;
	u_int hlen, dport, mtu;
	char buf[MAXHOSTNAMELEN + 100];

	dp = (struct icmp *)bp;
	ip = (struct ip *)bp2;
	str = buf;

	TCHECK(dp->icmp_code);
	switch (dp->icmp_type) {

	case ICMP_UNREACH:
		TCHECK(dp->icmp_ip.ip_dst);
		switch (dp->icmp_code) {

		case ICMP_UNREACH_PROTOCOL:
			TCHECK(dp->icmp_ip.ip_p);
			(void)snprintf(buf, sizeof(buf),
			    "%s protocol %d unreachable",
			    ipaddr_string(&dp->icmp_ip.ip_dst),
			    dp->icmp_ip.ip_p);
			break;

		case ICMP_UNREACH_PORT:
			TCHECK(dp->icmp_ip.ip_p);
			oip = &dp->icmp_ip;
			hlen = IP_HL(oip) * 4;
			ouh = (struct udphdr *)(((u_char *)oip) + hlen);
			dport = ntohs(ouh->uh_dport);
			switch (oip->ip_p) {

			case IPPROTO_TCP:
				(void)snprintf(buf, sizeof(buf),
					"%s tcp port %s unreachable",
					ipaddr_string(&oip->ip_dst),
					tcpport_string(dport));
				break;

			case IPPROTO_UDP:
				(void)snprintf(buf, sizeof(buf),
					"%s udp port %s unreachable",
					ipaddr_string(&oip->ip_dst),
					udpport_string(dport));
				break;

			default:
				(void)snprintf(buf, sizeof(buf),
					"%s protocol %d port %d unreachable",
					ipaddr_string(&oip->ip_dst),
					oip->ip_p, dport);
				break;
			}
			break;

		case ICMP_UNREACH_NEEDFRAG:
		    {
			register const struct mtu_discovery *mp;
			mp = (struct mtu_discovery *)&dp->icmp_void;
			mtu = EXTRACT_16BITS(&mp->nexthopmtu);
			if (mtu) {
				(void)snprintf(buf, sizeof(buf),
				    "%s unreachable - need to frag (mtu %d)",
				    ipaddr_string(&dp->icmp_ip.ip_dst), mtu);
			} else {
				(void)snprintf(buf, sizeof(buf),
				    "%s unreachable - need to frag",
				    ipaddr_string(&dp->icmp_ip.ip_dst));
			}
		    }
			break;

		default:
			fmt = tok2str(unreach2str, "#%d %%s unreachable",
			    dp->icmp_code);
			(void)snprintf(buf, sizeof(buf), fmt,
			    ipaddr_string(&dp->icmp_ip.ip_dst));
			break;
		}
		break;

	case ICMP_REDIRECT:
		TCHECK(dp->icmp_ip.ip_dst);
		fmt = tok2str(type2str, "redirect-#%d %%s to net %%s",
		    dp->icmp_code);
		(void)snprintf(buf, sizeof(buf), fmt,
		    ipaddr_string(&dp->icmp_ip.ip_dst),
		    ipaddr_string(&dp->icmp_gwaddr));
		break;

	case ICMP_ROUTERADVERT:
	    {
		register const struct ih_rdiscovery *ihp;
		register const struct id_rdiscovery *idp;
		u_int lifetime, num, size;

		(void)snprintf(buf, sizeof(buf), "router advertisement");
		cp = buf + strlen(buf);

		ihp = (struct ih_rdiscovery *)&dp->icmp_void;
		TCHECK(*ihp);
		(void)strncpy(cp, " lifetime ", sizeof(buf) - (cp - buf));
		cp = buf + strlen(buf);
		lifetime = EXTRACT_16BITS(&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 = ihp->ird_addrnum;
		(void)snprintf(cp, sizeof(buf) - (cp - buf), " %d:", num);
		cp = buf + strlen(buf);

		size = ihp->ird_addrsiz;
		if (size != 2) {
			(void)snprintf(cp, sizeof(buf) - (cp - buf),
			    " [size %d]", size);
			break;
		}
		idp = (struct id_rdiscovery *)&dp->icmp_data;
		while (num-- > 0) {
			TCHECK(*idp);
			(void)snprintf(cp, sizeof(buf) - (cp - buf), " {%s %u}",
			    ipaddr_string(&idp->ird_addr),
			    EXTRACT_32BITS(&idp->ird_pref));
			cp = buf + strlen(buf);
			++idp;
		}
	    }
		break;

	case ICMP_TIMXCEED:
		TCHECK(dp->icmp_ip.ip_dst);
		switch (dp->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-#%d",
			    dp->icmp_code);
			break;
		}
		break;

	case ICMP_PARAMPROB:
		if (dp->icmp_code)
			(void)snprintf(buf, sizeof(buf),
			    "parameter problem - code %d", dp->icmp_code);
		else {
			TCHECK(dp->icmp_pptr);
			(void)snprintf(buf, sizeof(buf),
			    "parameter problem - octet %d", dp->icmp_pptr);
		}
		break;

	case ICMP_MASKREPLY:
		TCHECK(dp->icmp_mask);
		(void)snprintf(buf, sizeof(buf), "address mask is 0x%08x",
		    (unsigned)ntohl(dp->icmp_mask));
		break;

	case ICMP_TSTAMP:
		TCHECK(dp->icmp_seq);
		(void)snprintf(buf, sizeof(buf),
		    "time stamp query id %u seq %u",
		    (unsigned)ntohs(dp->icmp_id),
		    (unsigned)ntohs(dp->icmp_seq));
		break;

	case ICMP_TSTAMPREPLY:
		TCHECK(dp->icmp_ttime);
		(void)snprintf(buf, sizeof(buf),
		    "time stamp reply id %u seq %u : org 0x%lx recv 0x%lx xmit 0x%lx",
		    (unsigned)ntohs(dp->icmp_id),
		    (unsigned)ntohs(dp->icmp_seq),
		    (unsigned long)ntohl(dp->icmp_otime),
		    (unsigned long)ntohl(dp->icmp_rtime),
		    (unsigned long)ntohl(dp->icmp_ttime));
		break;

	default:
		str = tok2str(icmp2str, "type-#%d", dp->icmp_type);
		break;
	}
	(void)printf("icmp: %s", str);
	if (vflag) {
		if (TTEST2(*bp, plen)) {
			if (in_cksum((u_short*)dp, plen, 0))
				printf(" (wrong icmp csum)");
		}
	}
 	if (vflag > 1 && !ICMP_INFOTYPE(dp->icmp_type)) {
 		bp += 8;
 		(void)printf(" for ");
 		ip = (struct ip *)bp;
 		snaplen = snapend - bp;
 		ip_print(bp, ntohs(ip->ip_len));
 	}
	return;
trunc:
	fputs("[|icmp]", stdout);
}
OpenPOWER on IntegriCloud