summaryrefslogtreecommitdiffstats
path: root/contrib/tcpdump/print-icmp6.c
blob: f6bc864fd0a9295b4b6a578cd791a5be4b813029 (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
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
/*
 * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
 *	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.
 */

#ifndef lint
static const char rcsid[] =
    "@(#) $Header: /tcpdump/master/tcpdump/print-icmp6.c,v 1.2.2.1 2000/01/11 06:58:24 fenner Exp $";
#endif

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

#ifdef INET6

#include <ctype.h>

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

#include <net/if.h>

#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/ip_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/tcp.h>

#include <arpa/inet.h>

#include <stdio.h>

#include <netinet/ip6.h>
#include <netinet/icmp6.h>

#include "interface.h"
#include "addrtoname.h"

void icmp6_opt_print(const u_char *, int);
void mld6_print(const u_char *);

void
icmp6_print(register const u_char *bp, register const u_char *bp2)
{
	register const struct icmp6_hdr *dp;
	register const struct ip6_hdr *ip;
	register const char *str;
	register const struct ip6_hdr *oip;
	register const struct udphdr *ouh;
	register int hlen, dport;
	register const u_char *ep;
	char buf[256];
	int icmp6len;

#if 0
#define TCHECK(var) if ((u_char *)&(var) > ep - sizeof(var)) goto trunc
#endif

	dp = (struct icmp6_hdr *)bp;
	ip = (struct ip6_hdr *)bp2;
	oip = (struct ip6_hdr *)(dp + 1);
	str = buf;
	/* 'ep' points to the end of avaible data. */
	ep = snapend;
	if (ip->ip6_plen)
		icmp6len = (ntohs(ip->ip6_plen) + sizeof(struct ip6_hdr) -
			    (bp - bp2));
	else			/* XXX: jumbo payload case... */
		icmp6len = snapend - bp;

#if 0
        (void)printf("%s > %s: ",
		ip6addr_string(&ip->ip6_src),
		ip6addr_string(&ip->ip6_dst));
#endif

	TCHECK(dp->icmp6_code);
	switch(dp->icmp6_type) {
	case ICMP6_DST_UNREACH:
		TCHECK(oip->ip6_dst);
		switch (dp->icmp6_code) {
		case ICMP6_DST_UNREACH_NOROUTE:
			printf("icmp6: %s unreachable route",
			       ip6addr_string(&oip->ip6_dst));
			break;
		case ICMP6_DST_UNREACH_ADMIN:
			printf("icmp6: %s unreachable prohibited",
			       ip6addr_string(&oip->ip6_dst));
			break;
#ifdef ICMP6_DST_UNREACH_BEYONDSCOPE
		case ICMP6_DST_UNREACH_BEYONDSCOPE:
#else
		case ICMP6_DST_UNREACH_NOTNEIGHBOR:
#endif
			printf("icmp6: %s beyond scope of source address %s",
			       ip6addr_string(&oip->ip6_dst),
			       ip6addr_string(&oip->ip6_src));
			break;
		case ICMP6_DST_UNREACH_ADDR:
			printf("icmp6: %s unreachable address",
			       ip6addr_string(&oip->ip6_dst));
			break;
		case ICMP6_DST_UNREACH_NOPORT:
			TCHECK(oip->ip6_nxt);
			hlen = sizeof(struct ip6_hdr);
			ouh = (struct udphdr *)(((u_char *)oip) + hlen);
			dport = ntohs(ouh->uh_dport);
			switch (oip->ip6_nxt) {
			case IPPROTO_TCP:
				printf("icmp6: %s tcp port %s unreachable",
					ip6addr_string(&oip->ip6_dst),
					tcpport_string(dport));
				break;
			case IPPROTO_UDP:
				printf("icmp6: %s udp port %s unreachable",
					ip6addr_string(&oip->ip6_dst),
					udpport_string(dport));
				break;
			default:
				printf("icmp6: %s protocol %d port %d unreachable",
					ip6addr_string(&oip->ip6_dst),
					oip->ip6_nxt, dport);
				break;
			}
			break;
		default:
			printf("icmp6: %s unreachable code-#%d",
				ip6addr_string(&oip->ip6_dst),
				dp->icmp6_code);
			break;
		}
		break;
	case ICMP6_PACKET_TOO_BIG:
		TCHECK(dp->icmp6_mtu);
		printf("icmp6: too big %u\n", (u_int32_t)ntohl(dp->icmp6_mtu));
		break;
	case ICMP6_TIME_EXCEEDED:
		TCHECK(oip->ip6_dst);
		switch (dp->icmp6_code) {
		case ICMP6_TIME_EXCEED_TRANSIT:
			printf("icmp6: time exceeded in-transit for %s",
				ip6addr_string(&oip->ip6_dst));
			break;
		case ICMP6_TIME_EXCEED_REASSEMBLY:
			printf("icmp6: ip6 reassembly time exceeded");
			break;
		default:
			printf("icmp6: time exceeded code-#%d",
				dp->icmp6_code);
			break;
		}
		break;
	case ICMP6_PARAM_PROB:
		TCHECK(oip->ip6_dst);
		switch (dp->icmp6_code) {
		case ICMP6_PARAMPROB_HEADER:
			printf("icmp6: parameter problem errorneous - octet %u\n",
				(u_int32_t)ntohl(dp->icmp6_pptr));
			break;
		case ICMP6_PARAMPROB_NEXTHEADER:
			printf("icmp6: parameter problem next header - octet %u\n",
				(u_int32_t)ntohl(dp->icmp6_pptr));
			break;
		case ICMP6_PARAMPROB_OPTION:
			printf("icmp6: parameter problem option - octet %u\n",
				(u_int32_t)ntohl(dp->icmp6_pptr));
			break;
		default:
			printf("icmp6: parameter problem code-#%d",
			       dp->icmp6_code);
			break;
		}
		break;
	case ICMP6_ECHO_REQUEST:
		printf("icmp6: echo request");
		break;
	case ICMP6_ECHO_REPLY:
		printf("icmp6: echo reply");
		break;
	case ICMP6_MEMBERSHIP_QUERY:
		printf("icmp6: multicast listener query ");
		mld6_print((const u_char *)dp);
		break;
	case ICMP6_MEMBERSHIP_REPORT:
		printf("icmp6: multicast listener report ");
		mld6_print((const u_char *)dp);
		break;
	case ICMP6_MEMBERSHIP_REDUCTION:
		printf("icmp6: multicast listener done ");
		mld6_print((const u_char *)dp);
		break;
	case ND_ROUTER_SOLICIT:
		printf("icmp6: router solicitation ");
		if (vflag) {
#define RTSOLLEN 8
		        icmp6_opt_print((const u_char *)dp + RTSOLLEN,
					icmp6len - RTSOLLEN);
		}
		break;
	case ND_ROUTER_ADVERT:
		printf("icmp6: router advertisement");
		if (vflag) {
			struct nd_router_advert *p;

			p = (struct nd_router_advert *)dp;
			TCHECK(p->nd_ra_retransmit);
			printf("(chlim=%d, ", (int)p->nd_ra_curhoplimit);
			if (p->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED)
				printf("M");
			if (p->nd_ra_flags_reserved & ND_RA_FLAG_OTHER)
				printf("O");
			if (p->nd_ra_flags_reserved != 0)
				printf(" ");
			printf("router_ltime=%d, ", ntohs(p->nd_ra_router_lifetime));
			printf("reachable_time=%u, ",
				(u_int32_t)ntohl(p->nd_ra_reachable));
			printf("retrans_time=%u)",
				(u_int32_t)ntohl(p->nd_ra_retransmit));
#define RTADVLEN 16
		        icmp6_opt_print((const u_char *)dp + RTADVLEN,
					icmp6len - RTADVLEN);
		}
		break;
	case ND_NEIGHBOR_SOLICIT:
	    {
		struct nd_neighbor_solicit *p;
		p = (struct nd_neighbor_solicit *)dp;
		TCHECK(p->nd_ns_target);
		printf("icmp6: neighbor sol: who has %s",
			ip6addr_string(&p->nd_ns_target));
		if (vflag) {
#define NDSOLLEN 24
		        icmp6_opt_print((const u_char *)dp + NDSOLLEN,
					icmp6len - NDSOLLEN);
		}
	    }
		break;
	case ND_NEIGHBOR_ADVERT:
	    {
		struct nd_neighbor_advert *p;

		p = (struct nd_neighbor_advert *)dp;
		TCHECK(p->nd_na_target);
		printf("icmp6: neighbor adv: tgt is %s",
			ip6addr_string(&p->nd_na_target));
                if (vflag) {
#define ND_NA_FLAG_ALL	\
	(ND_NA_FLAG_ROUTER|ND_NA_FLAG_SOLICITED|ND_NA_FLAG_OVERRIDE)
			/* we don't need ntohl() here.  see advanced-api-04. */
			if (p->nd_na_flags_reserved &  ND_NA_FLAG_ALL) {
#undef ND_NA_FLAG_ALL
				u_int32_t flags;

				flags = p->nd_na_flags_reserved;
				printf("(");
				if (flags & ND_NA_FLAG_ROUTER)
					printf("R");
				if (flags & ND_NA_FLAG_SOLICITED)
					printf("S");
				if (flags & ND_NA_FLAG_OVERRIDE)
					printf("O");
				printf(")");
			}
#define NDADVLEN 24
		        icmp6_opt_print((const u_char *)dp + NDADVLEN,
					icmp6len - NDADVLEN);
		}
	    }
		break;
	case ND_REDIRECT:
	{
#define RDR(i) ((struct nd_redirect *)(i))
		char tgtbuf[INET6_ADDRSTRLEN], dstbuf[INET6_ADDRSTRLEN];

		TCHECK(RDR(dp)->nd_rd_dst);
		inet_ntop(AF_INET6, &RDR(dp)->nd_rd_target,
			  tgtbuf, INET6_ADDRSTRLEN);
		inet_ntop(AF_INET6, &RDR(dp)->nd_rd_dst,
			  dstbuf, INET6_ADDRSTRLEN);
		printf("icmp6: redirect %s to %s", dstbuf, tgtbuf);
#define REDIRECTLEN 40
		if (vflag) {
			icmp6_opt_print((const u_char *)dp + REDIRECTLEN,
					icmp6len - REDIRECTLEN);
		}
		break;
	}
	case ICMP6_ROUTER_RENUMBERING:
		switch (dp->icmp6_code) {
		case ICMP6_ROUTER_RENUMBERING_COMMAND:
			printf("icmp6: router renum command");
			break;
		case ICMP6_ROUTER_RENUMBERING_RESULT:
			printf("icmp6: router renum result");
			break;
		default:
			printf("icmp6: router renum code-#%d", dp->icmp6_code);
			break;
		}
		break;
#ifdef ICMP6_WRUREQUEST
	case ICMP6_WRUREQUEST:	/*ICMP6_FQDN_QUERY*/
	    {
		int siz;
		siz = ep - (u_char *)(dp + 1);
		if (siz == 4)
			printf("icmp6: who-are-you request");
		else {
			printf("icmp6: FQDN request");
			if (vflag) {
				if (siz < 8)
					printf("?(icmp6_data %d bytes)", siz);
				else if (8 < siz)
					printf("?(extra %d bytes)", siz - 8);
			}
		}
		break;
	    }
#endif /*ICMP6_WRUREQUEST*/
#ifdef ICMP6_WRUREPLY
	case ICMP6_WRUREPLY:	/*ICMP6_FQDN_REPLY*/
	    {
		enum { UNKNOWN, WRU, FQDN } mode = UNKNOWN;
		u_char const *buf;
		u_char const *cp = NULL;

		buf = (u_char *)(dp + 1);

		/* fair guess */
		if (buf[12] == ep - buf - 13)
			mode = FQDN;
		else if (dp->icmp6_code == 1)
			mode = FQDN;

		/* wild guess */
		if (mode == UNKNOWN) {
			cp = buf + 4;
			while (cp < ep) {
				if (!isprint(*cp++))
					mode = FQDN;
			}
		}
#ifndef abs
#define abs(a)	((0 < (a)) ? (a) : -(a))
#endif
		if (mode == UNKNOWN && 2 < abs(buf[12] - (ep - buf - 13)))
			mode = WRU;
		if (mode == UNKNOWN)
			mode = FQDN;

		if (mode == WRU) {
			cp = buf + 4;
			printf("icmp6: who-are-you reply(\"");
		} else if (mode == FQDN) {
			cp = buf + 13;
			printf("icmp6: FQDN reply(\"");
		}
		for (; cp < ep; cp++)
			printf((isprint(*cp) ? "%c" : "\\%03o"), *cp);
		printf("\"");
		if (vflag) {
			printf(",%s", mode == FQDN ? "FQDN" : "WRU");
			if (mode == FQDN) {
				long ttl;
				ttl = (long)ntohl(*(u_long *)&buf[8]);
				if (dp->icmp6_code == 1)
					printf(",TTL=unknown");
				else if (ttl < 0)
					printf(",TTL=%ld:invalid", ttl);
				else
					printf(",TTL=%ld", ttl);
				if (buf[12] != ep - buf - 13) {
					(void)printf(",invalid namelen:%d/%u",
						buf[12],
						(unsigned int)(ep - buf - 13));
				}
			}
		}
		printf(")");
		break;
	    }
#endif /*ICMP6_WRUREPLY*/
	default:
		printf("icmp6: type-#%d", dp->icmp6_type);
		break;
	}
	return;
trunc:
	fputs("[|icmp6]", stdout);
#if 0
#undef TCHECK
#endif
}

void
icmp6_opt_print(register const u_char *bp, int resid)
{
	register const struct nd_opt_hdr *op;
	register const struct nd_opt_hdr *opl;	/* why there's no struct? */
	register const struct nd_opt_prefix_info *opp;
	register const struct icmp6_opts_redirect *opr;
	register const struct nd_opt_mtu *opm;
	register const u_char *ep;
	int	opts_len;
#if 0
	register const struct ip6_hdr *ip;
	register const char *str;
	register const struct ip6_hdr *oip;
	register const struct udphdr *ouh;
	register int hlen, dport;
	char buf[256];
#endif

#if 0
#define TCHECK(var) if ((u_char *)&(var) > ep - sizeof(var)) goto trunc
#endif
#define ECHECK(var) if ((u_char *)&(var) > ep - sizeof(var)) return

	op = (struct nd_opt_hdr *)bp;
#if 0
	ip = (struct ip6_hdr *)bp2;
	oip = &dp->icmp6_ip6;
	str = buf;
#endif
	/* 'ep' points to the end of avaible data. */
	ep = snapend;

	ECHECK(op->nd_opt_len);
	if (resid <= 0)
		return;
	switch(op->nd_opt_type) {
	case ND_OPT_SOURCE_LINKADDR:
		opl = (struct nd_opt_hdr *)op;
#if 1
		if ((u_char *)opl + (opl->nd_opt_len << 3) > ep)
			goto trunc;
#else
		TCHECK((u_char *)opl + (opl->nd_opt_len << 3) - 1);
#endif
		printf("(src lladdr: %s",
			etheraddr_string((u_char *)(opl + 1)));
		if (opl->nd_opt_len != 1)
			printf("!");
		printf(")");
		icmp6_opt_print((const u_char *)op + (op->nd_opt_len << 3),
				resid - (op->nd_opt_len << 3));
		break;
	case ND_OPT_TARGET_LINKADDR:
		opl = (struct nd_opt_hdr *)op;
#if 1
		if ((u_char *)opl + (opl->nd_opt_len << 3) > ep)
			goto trunc;
#else
		TCHECK((u_char *)opl + (opl->nd_opt_len << 3) - 1);
#endif
		printf("(tgt lladdr: %s",
			etheraddr_string((u_char *)(opl + 1)));
		if (opl->nd_opt_len != 1)
			printf("!");
		printf(")");
		icmp6_opt_print((const u_char *)op + (op->nd_opt_len << 3),
				resid - (op->nd_opt_len << 3));
		break;
	case ND_OPT_PREFIX_INFORMATION:
		opp = (struct nd_opt_prefix_info *)op;
		TCHECK(opp->nd_opt_pi_prefix);
		printf("(prefix info: ");
		if (opp->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_ONLINK)
		       printf("L");
		if (opp->nd_opt_pi_flags_reserved & ND_OPT_PI_FLAG_AUTO)
		       printf("A");
		if (opp->nd_opt_pi_flags_reserved)
			printf(" ");
		printf("valid_ltime=");
		if ((u_int32_t)ntohl(opp->nd_opt_pi_valid_time) == ~0U)
			printf("infinity");
		else {
			printf("%u", (u_int32_t)ntohl(opp->nd_opt_pi_valid_time));
		}
		printf(", ");
		printf("preffered_ltime=");
		if ((u_int32_t)ntohl(opp->nd_opt_pi_preferred_time) == ~0U)
			printf("infinity");
		else {
			printf("%u", (u_int32_t)ntohl(opp->nd_opt_pi_preferred_time));
		}
		printf(", ");
		printf("prefix=%s/%d", ip6addr_string(&opp->nd_opt_pi_prefix),
			opp->nd_opt_pi_prefix_len);
		if (opp->nd_opt_pi_len != 4)
			printf("!");
		printf(")");
		icmp6_opt_print((const u_char *)op + (op->nd_opt_len << 3),
				resid - (op->nd_opt_len << 3));
		break;
	case ND_OPT_REDIRECTED_HEADER:
		opr = (struct icmp6_opts_redirect *)op;
		printf("(redirect)");
		/* xxx */
		icmp6_opt_print((const u_char *)op + (op->nd_opt_len << 3),
				resid - (op->nd_opt_len << 3));
		break;
	case ND_OPT_MTU:
		opm = (struct nd_opt_mtu *)op;
		TCHECK(opm->nd_opt_mtu_mtu);
		printf("(mtu: ");
		printf("mtu=%u", (u_int32_t)ntohl(opm->nd_opt_mtu_mtu));
		if (opm->nd_opt_mtu_len != 1)
			printf("!");
		printf(")");
		icmp6_opt_print((const u_char *)op + (op->nd_opt_len << 3),
				resid - (op->nd_opt_len << 3));
		break;
	default:
		opts_len = op->nd_opt_len;
		printf("(unknwon opt_type=%d, opt_len=%d)",
		       op->nd_opt_type, opts_len);
		if (opts_len == 0)
			opts_len = 1; /* XXX */
		icmp6_opt_print((const u_char *)op + (opts_len << 3),
				resid - (opts_len << 3));
		break;
	}
	return;
 trunc:
	fputs("[ndp opt]", stdout);
	return;
#if 0
#undef TCHECK
#endif
#undef ECHECK
}

void
mld6_print(register const u_char *bp)
{
	register struct mld6_hdr *mp = (struct mld6_hdr *)bp;
	register const u_char *ep;

	/* 'ep' points to the end of avaible data. */
	ep = snapend;

	if ((u_char *)mp + sizeof(*mp) > ep)
		return;

	printf("max resp delay: %d ", ntohs(mp->mld6_maxdelay));
	printf("addr: %s", ip6addr_string(&mp->mld6_addr));

	return;
}
#endif /* INET6 */
OpenPOWER on IntegriCloud