print-icmp6.c revision 162017 
1/*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
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
22#ifndef lint
23static const char rcsid[] _U_ =
24    "@(#) $Header: /tcpdump/master/tcpdump/print-icmp6.c,v 1.79.2.6 2005/09/05 09:29:28 guy Exp $";
25#endif
26
27#ifdef HAVE_CONFIG_H
28#include "config.h"
29#endif
30
31#ifdef INET6
32
33#include <tcpdump-stdinc.h>
34
35#include <stdio.h>
36#include <string.h>
37
38#include "interface.h"
39#include "addrtoname.h"
40#include "extract.h"
41
42#include "ip6.h"
43#include "icmp6.h"
44#include "ipproto.h"
45
46#include "udp.h"
47#include "ah.h"
48
49static const char *get_rtpref(u_int);
50static const char *get_lifetime(u_int32_t);
51static void print_lladdr(const u_char *, size_t);
52static void icmp6_opt_print(const u_char *, int);
53static void mld6_print(const u_char *);
54static void mldv2_report_print(const u_char *, u_int);
55static void mldv2_query_print(const u_char *, u_int);
56static struct udphdr *get_upperlayer(u_char *, u_int *);
57static void dnsname_print(const u_char *, const u_char *);
58static void icmp6_nodeinfo_print(u_int, const u_char *, const u_char *);
59static void icmp6_rrenum_print(const u_char *, const u_char *);
60
61#ifndef abs
62#define abs(a)	((0 < (a)) ? (a) : -(a))
63#endif
64
65static struct tok icmp6_type_values[] = {
66    { ICMP6_DST_UNREACH, "destination unreachable"},
67    { ICMP6_PACKET_TOO_BIG, "packet too big"},
68    { ICMP6_TIME_EXCEEDED, "time exceeded in-transit"},
69    { ICMP6_PARAM_PROB, "parameter problem"},
70    { ICMP6_ECHO_REQUEST, "echo request"},
71    { ICMP6_ECHO_REPLY, "echo reply"},
72    { MLD6_LISTENER_QUERY, "multicast listener query"},
73    { MLD6_LISTENER_REPORT, "multicast listener report"},
74    { MLD6_LISTENER_DONE, "multicast listener done"},
75    { ND_ROUTER_SOLICIT, "router solicitation"},
76    { ND_ROUTER_ADVERT, "router advertisement"},
77    { ND_NEIGHBOR_SOLICIT, "neighbor solicitation"},
78    { ND_NEIGHBOR_ADVERT, "neighbor advertisement"},
79    { ND_REDIRECT, "redirect"},
80    { ICMP6_ROUTER_RENUMBERING, "router renumbering"},
81    { IND_SOLICIT, "inverse neighbor solicitation"},
82    { IND_ADVERT, "inverse neighbor advertisement"},
83    { MLDV2_LISTENER_REPORT, "multicast listener report v2"},
84    { ICMP6_HADISCOV_REQUEST, "ha discovery request"},
85    { ICMP6_HADISCOV_REPLY, "ha discovery reply"},
86    { ICMP6_MOBILEPREFIX_SOLICIT, "mobile router solicitation"},
87    { ICMP6_MOBILEPREFIX_ADVERT, "mobile router advertisement"},
88    { ICMP6_WRUREQUEST, "who-are-you request"},
89    { ICMP6_WRUREPLY, "who-are-you reply"},
90    { ICMP6_NI_QUERY, "node information query"},
91    { ICMP6_NI_REPLY, "node information reply"},
92    { MLD6_MTRACE, "mtrace message"},
93    { MLD6_MTRACE_RESP, "mtrace response"},
94    { 0,	NULL }
95};
96
97static struct tok icmp6_dst_unreach_code_values[] = {
98    { ICMP6_DST_UNREACH_NOROUTE, "unreachable route" },
99    { ICMP6_DST_UNREACH_ADMIN, " unreachable prohibited"},
100    { ICMP6_DST_UNREACH_BEYONDSCOPE, "beyond scope"},
101    { ICMP6_DST_UNREACH_ADDR, "unreachable address"},
102    { ICMP6_DST_UNREACH_NOPORT, "unreachable port"},
103    { 0,	NULL }
104};
105
106static struct tok icmp6_opt_pi_flag_values[] = {
107    { ND_OPT_PI_FLAG_ONLINK, "onlink" },
108    { ND_OPT_PI_FLAG_AUTO, "auto" },
109    { ND_OPT_PI_FLAG_ROUTER, "router" },
110    { 0,	NULL }
111};
112
113static struct tok icmp6_opt_ra_flag_values[] = {
114    { ND_RA_FLAG_MANAGED, "managed" },
115    { ND_RA_FLAG_OTHER, "other stateful"},
116    { ND_RA_FLAG_HOME_AGENT, "home agent"},
117    { 0,	NULL }
118};
119
120static struct tok icmp6_nd_na_flag_values[] = {
121    { ND_NA_FLAG_ROUTER, "router" },
122    { ND_NA_FLAG_SOLICITED, "solicited" },
123    { ND_NA_FLAG_OVERRIDE, "override" },
124    { 0,	NULL }
125};
126
127
128static struct tok icmp6_opt_values[] = {
129   { ND_OPT_SOURCE_LINKADDR, "source link-address"},
130   { ND_OPT_TARGET_LINKADDR, "destination link-address"},
131   { ND_OPT_PREFIX_INFORMATION, "prefix info"},
132   { ND_OPT_REDIRECTED_HEADER, "redirected header"},
133   { ND_OPT_MTU, "mtu"},
134   { ND_OPT_ADVINTERVAL, "advertisement interval"},
135   { ND_OPT_HOMEAGENT_INFO, "homeagent information"},
136   { ND_OPT_ROUTE_INFO, "route info"},
137   { 0,	NULL }
138};
139
140/* mldv2 report types */
141static struct tok mldv2report2str[] = {
142	{ 1,	"is_in" },
143	{ 2,	"is_ex" },
144	{ 3,	"to_in" },
145	{ 4,	"to_ex" },
146	{ 5,	"allow" },
147	{ 6,	"block" },
148	{ 0,	NULL }
149};
150
151static const char *
152get_rtpref(u_int v)
153{
154	static const char *rtpref_str[] = {
155		"medium",		/* 00 */
156		"high",			/* 01 */
157		"rsv",			/* 10 */
158		"low"			/* 11 */
159	};
160
161	return rtpref_str[((v & ND_RA_FLAG_RTPREF_MASK) >> 3) & 0xff];
162}
163
164static const char *
165get_lifetime(u_int32_t v)
166{
167	static char buf[20];
168
169	if (v == (u_int32_t)~0UL)
170		return "infinity";
171	else {
172		snprintf(buf, sizeof(buf), "%u", v);
173		return buf;
174	}
175}
176
177static void
178print_lladdr(const u_int8_t *p, size_t l)
179{
180	const u_int8_t *ep, *q;
181
182	q = p;
183	ep = p + l;
184	while (l > 0 && q < ep) {
185		if (q > p)
186			printf(":");
187		printf("%02x", *q++);
188		l--;
189	}
190}
191
192static int icmp6_cksum(const struct ip6_hdr *ip6, const struct icmp6_hdr *icp,
193	u_int len)
194{
195	size_t i;
196	register const u_int16_t *sp;
197	u_int32_t sum;
198	union {
199		struct {
200			struct in6_addr ph_src;
201			struct in6_addr ph_dst;
202			u_int32_t	ph_len;
203			u_int8_t	ph_zero[3];
204			u_int8_t	ph_nxt;
205		} ph;
206		u_int16_t pa[20];
207	} phu;
208
209	/* pseudo-header */
210	memset(&phu, 0, sizeof(phu));
211	phu.ph.ph_src = ip6->ip6_src;
212	phu.ph.ph_dst = ip6->ip6_dst;
213	phu.ph.ph_len = htonl(len);
214	phu.ph.ph_nxt = IPPROTO_ICMPV6;
215
216	sum = 0;
217	for (i = 0; i < sizeof(phu.pa) / sizeof(phu.pa[0]); i++)
218		sum += phu.pa[i];
219
220	sp = (const u_int16_t *)icp;
221
222	for (i = 0; i < (len & ~1); i += 2)
223		sum += *sp++;
224
225	if (len & 1)
226		sum += htons((*(const u_int8_t *)sp) << 8);
227
228	while (sum > 0xffff)
229		sum = (sum & 0xffff) + (sum >> 16);
230	sum = ~sum & 0xffff;
231
232	return (sum);
233}
234
235void
236icmp6_print(const u_char *bp, u_int length, const u_char *bp2, int fragmented)
237{
238	const struct icmp6_hdr *dp;
239	const struct ip6_hdr *ip;
240	const struct ip6_hdr *oip;
241	const struct udphdr *ouh;
242	int dport;
243	const u_char *ep;
244	u_int prot;
245
246	dp = (struct icmp6_hdr *)bp;
247	ip = (struct ip6_hdr *)bp2;
248	oip = (struct ip6_hdr *)(dp + 1);
249	/* 'ep' points to the end of available data. */
250	ep = snapend;
251
252	TCHECK(dp->icmp6_cksum);
253
254	if (vflag && !fragmented) {
255		int sum = dp->icmp6_cksum;
256
257		if (TTEST2(bp[0], length)) {
258			sum = icmp6_cksum(ip, dp, length);
259			if (sum != 0)
260				(void)printf("[bad icmp6 cksum %x!] ", sum);
261			else
262				(void)printf("[icmp6 sum ok] ");
263		}
264	}
265
266        printf("ICMP6, %s", tok2str(icmp6_type_values,"unknown icmp6 type (%u)",dp->icmp6_type));
267
268        /* display cosmetics: print the packet length for printer that use the vflag now */
269        if (vflag && (dp->icmp6_type ==
270                      ND_ROUTER_SOLICIT ||
271                      ND_ROUTER_ADVERT ||
272                      ND_NEIGHBOR_ADVERT ||
273                      ND_NEIGHBOR_SOLICIT ||
274                      ND_REDIRECT ||
275                      ICMP6_HADISCOV_REPLY ||
276                      ICMP6_MOBILEPREFIX_ADVERT ))
277            printf(", length %u", length);
278
279	switch (dp->icmp6_type) {
280	case ICMP6_DST_UNREACH:
281		TCHECK(oip->ip6_dst);
282                printf(", %s", tok2str(icmp6_dst_unreach_code_values,"unknown unreach code (%u)",dp->icmp6_code));
283		switch (dp->icmp6_code) {
284
285		case ICMP6_DST_UNREACH_NOROUTE: /* fall through */
286		case ICMP6_DST_UNREACH_ADMIN:
287		case ICMP6_DST_UNREACH_ADDR:
288                        printf(" %s",ip6addr_string(&oip->ip6_dst));
289                        break;
290		case ICMP6_DST_UNREACH_BEYONDSCOPE:
291			printf(" %s, source address %s",
292			       ip6addr_string(&oip->ip6_dst),
293			       ip6addr_string(&oip->ip6_src));
294			break;
295		case ICMP6_DST_UNREACH_NOPORT:
296			if ((ouh = get_upperlayer((u_char *)oip, &prot))
297			    == NULL)
298				goto trunc;
299
300			dport = EXTRACT_16BITS(&ouh->uh_dport);
301			switch (prot) {
302			case IPPROTO_TCP:
303				printf(", %s tcp port %s",
304					ip6addr_string(&oip->ip6_dst),
305					tcpport_string(dport));
306				break;
307			case IPPROTO_UDP:
308				printf(", %s udp port %s",
309					ip6addr_string(&oip->ip6_dst),
310					udpport_string(dport));
311				break;
312			default:
313				printf(", %s protocol %d port %d unreachable",
314					ip6addr_string(&oip->ip6_dst),
315					oip->ip6_nxt, dport);
316				break;
317			}
318			break;
319		default:
320                    if (vflag <= 1) {
321                            print_unknown_data(bp,"\n\t",length);
322                            return;
323                    }
324                    break;
325		}
326		break;
327	case ICMP6_PACKET_TOO_BIG:
328		TCHECK(dp->icmp6_mtu);
329		printf(", mtu %u", EXTRACT_32BITS(&dp->icmp6_mtu));
330		break;
331	case ICMP6_TIME_EXCEEDED:
332		TCHECK(oip->ip6_dst);
333		switch (dp->icmp6_code) {
334		case ICMP6_TIME_EXCEED_TRANSIT:
335			printf(" for %s",
336				ip6addr_string(&oip->ip6_dst));
337			break;
338		case ICMP6_TIME_EXCEED_REASSEMBLY:
339			printf(" (reassembly)");
340			break;
341		default:
342			printf(", unknown code (%u)", dp->icmp6_code);
343			break;
344		}
345		break;
346	case ICMP6_PARAM_PROB:
347		TCHECK(oip->ip6_dst);
348		switch (dp->icmp6_code) {
349		case ICMP6_PARAMPROB_HEADER:
350			printf(", errorneous - octet %u", EXTRACT_32BITS(&dp->icmp6_pptr));
351			break;
352		case ICMP6_PARAMPROB_NEXTHEADER:
353			printf(", next header - octet %u", EXTRACT_32BITS(&dp->icmp6_pptr));
354			break;
355		case ICMP6_PARAMPROB_OPTION:
356			printf(", option - octet %u", EXTRACT_32BITS(&dp->icmp6_pptr));
357			break;
358		default:
359			printf(", code-#%d",
360			       dp->icmp6_code);
361			break;
362		}
363		break;
364	case ICMP6_ECHO_REQUEST:
365	case ICMP6_ECHO_REPLY:
366		TCHECK(dp->icmp6_seq);
367		printf(", seq %u", EXTRACT_16BITS(&dp->icmp6_seq));
368		break;
369	case ICMP6_MEMBERSHIP_QUERY:
370		if (length == MLD_MINLEN) {
371			mld6_print((const u_char *)dp);
372		} else if (length >= MLDV2_MINLEN) {
373			printf("v2 ");
374			mldv2_query_print((const u_char *)dp, length);
375		} else {
376			printf(" unknown-version (len %u) ", length);
377		}
378		break;
379	case ICMP6_MEMBERSHIP_REPORT:
380		mld6_print((const u_char *)dp);
381		break;
382	case ICMP6_MEMBERSHIP_REDUCTION:
383		mld6_print((const u_char *)dp);
384		break;
385	case ND_ROUTER_SOLICIT:
386#define RTSOLLEN 8
387		if (vflag) {
388			icmp6_opt_print((const u_char *)dp + RTSOLLEN,
389					length - RTSOLLEN);
390		}
391		break;
392	case ND_ROUTER_ADVERT:
393#define RTADVLEN 16
394		if (vflag) {
395			struct nd_router_advert *p;
396
397			p = (struct nd_router_advert *)dp;
398			TCHECK(p->nd_ra_retransmit);
399			printf("\n\thop limit %u, Flags [%s]" \
400                               ", pref %s, router lifetime %us, reachable time %us, retrans time %us",
401                               (u_int)p->nd_ra_curhoplimit,
402                               bittok2str(icmp6_opt_ra_flag_values,"none",(p->nd_ra_flags_reserved)),
403                               get_rtpref(p->nd_ra_flags_reserved),
404                               EXTRACT_16BITS(&p->nd_ra_router_lifetime),
405                               EXTRACT_32BITS(&p->nd_ra_reachable),
406                               EXTRACT_32BITS(&p->nd_ra_retransmit));
407
408			icmp6_opt_print((const u_char *)dp + RTADVLEN,
409					length - RTADVLEN);
410		}
411		break;
412	case ND_NEIGHBOR_SOLICIT:
413	    {
414		struct nd_neighbor_solicit *p;
415		p = (struct nd_neighbor_solicit *)dp;
416		TCHECK(p->nd_ns_target);
417		printf(", who has %s", ip6addr_string(&p->nd_ns_target));
418		if (vflag) {
419#define NDSOLLEN 24
420			icmp6_opt_print((const u_char *)dp + NDSOLLEN,
421					length - NDSOLLEN);
422		}
423	    }
424		break;
425	case ND_NEIGHBOR_ADVERT:
426	    {
427		struct nd_neighbor_advert *p;
428
429		p = (struct nd_neighbor_advert *)dp;
430		TCHECK(p->nd_na_target);
431		printf(", tgt is %s",
432			ip6addr_string(&p->nd_na_target));
433		if (vflag) {
434                        printf(", Flags [%s]",
435                               bittok2str(icmp6_nd_na_flag_values,
436                                          "none",
437                                          EXTRACT_32BITS(&p->nd_na_flags_reserved)));
438#define NDADVLEN 24
439			icmp6_opt_print((const u_char *)dp + NDADVLEN,
440					length - NDADVLEN);
441#undef NDADVLEN
442		}
443	    }
444		break;
445	case ND_REDIRECT:
446#define RDR(i) ((struct nd_redirect *)(i))
447		TCHECK(RDR(dp)->nd_rd_dst);
448		printf(", %s", getname6((const u_char *)&RDR(dp)->nd_rd_dst));
449		TCHECK(RDR(dp)->nd_rd_target);
450		printf(" to %s",
451		    getname6((const u_char*)&RDR(dp)->nd_rd_target));
452#define REDIRECTLEN 40
453		if (vflag) {
454			icmp6_opt_print((const u_char *)dp + REDIRECTLEN,
455					length - REDIRECTLEN);
456		}
457		break;
458#undef REDIRECTLEN
459#undef RDR
460	case ICMP6_ROUTER_RENUMBERING:
461		icmp6_rrenum_print(bp, ep);
462		break;
463	case ICMP6_NI_QUERY:
464	case ICMP6_NI_REPLY:
465		icmp6_nodeinfo_print(length, bp, ep);
466		break;
467	case IND_SOLICIT:
468	case IND_ADVERT:
469		break;
470	case ICMP6_V2_MEMBERSHIP_REPORT:
471		mldv2_report_print((const u_char *) dp, length);
472		break;
473	case ICMP6_MOBILEPREFIX_SOLICIT: /* fall through */
474	case ICMP6_HADISCOV_REQUEST:
475                TCHECK(dp->icmp6_data16[0]);
476                printf(", id 0x%04x", EXTRACT_16BITS(&dp->icmp6_data16[0]));
477                break;
478	case ICMP6_HADISCOV_REPLY:
479		if (vflag) {
480			struct in6_addr *in6;
481			u_char *cp;
482
483			TCHECK(dp->icmp6_data16[0]);
484			printf(", id 0x%04x", EXTRACT_16BITS(&dp->icmp6_data16[0]));
485			cp = (u_char *)dp + length;
486			in6 = (struct in6_addr *)(dp + 1);
487			for (; (u_char *)in6 < cp; in6++) {
488				TCHECK(*in6);
489				printf(", %s", ip6addr_string(in6));
490			}
491		}
492		break;
493	case ICMP6_MOBILEPREFIX_ADVERT:
494		if (vflag) {
495			TCHECK(dp->icmp6_data16[0]);
496			printf(", id 0x%04x", EXTRACT_16BITS(&dp->icmp6_data16[0]));
497			if (dp->icmp6_data16[1] & 0xc0)
498				printf(" ");
499			if (dp->icmp6_data16[1] & 0x80)
500				printf("M");
501			if (dp->icmp6_data16[1] & 0x40)
502				printf("O");
503#define MPADVLEN 8
504			icmp6_opt_print((const u_char *)dp + MPADVLEN,
505					length - MPADVLEN);
506		}
507		break;
508	default:
509                printf(", length %u", length);
510                if (vflag <= 1)
511                    print_unknown_data(bp,"\n\t", length);
512                return;
513        }
514        if (!vflag)
515            printf(", length %u", length);
516	return;
517trunc:
518	fputs("[|icmp6]", stdout);
519}
520
521static struct udphdr *
522get_upperlayer(u_char *bp, u_int *prot)
523{
524	const u_char *ep;
525	struct ip6_hdr *ip6 = (struct ip6_hdr *)bp;
526	struct udphdr *uh;
527	struct ip6_hbh *hbh;
528	struct ip6_frag *fragh;
529	struct ah *ah;
530	u_int nh;
531	int hlen;
532
533	/* 'ep' points to the end of available data. */
534	ep = snapend;
535
536	if (!TTEST(ip6->ip6_nxt))
537		return NULL;
538
539	nh = ip6->ip6_nxt;
540	hlen = sizeof(struct ip6_hdr);
541
542	while (bp < ep) {
543		bp += hlen;
544
545		switch(nh) {
546		case IPPROTO_UDP:
547		case IPPROTO_TCP:
548			uh = (struct udphdr *)bp;
549			if (TTEST(uh->uh_dport)) {
550				*prot = nh;
551				return(uh);
552			}
553			else
554				return(NULL);
555			/* NOTREACHED */
556
557		case IPPROTO_HOPOPTS:
558		case IPPROTO_DSTOPTS:
559		case IPPROTO_ROUTING:
560			hbh = (struct ip6_hbh *)bp;
561			if (!TTEST(hbh->ip6h_len))
562				return(NULL);
563			nh = hbh->ip6h_nxt;
564			hlen = (hbh->ip6h_len + 1) << 3;
565			break;
566
567		case IPPROTO_FRAGMENT: /* this should be odd, but try anyway */
568			fragh = (struct ip6_frag *)bp;
569			if (!TTEST(fragh->ip6f_offlg))
570				return(NULL);
571			/* fragments with non-zero offset are meaningless */
572			if ((EXTRACT_16BITS(&fragh->ip6f_offlg) & IP6F_OFF_MASK) != 0)
573				return(NULL);
574			nh = fragh->ip6f_nxt;
575			hlen = sizeof(struct ip6_frag);
576			break;
577
578		case IPPROTO_AH:
579			ah = (struct ah *)bp;
580			if (!TTEST(ah->ah_len))
581				return(NULL);
582			nh = ah->ah_nxt;
583			hlen = (ah->ah_len + 2) << 2;
584			break;
585
586		default:	/* unknown or undecodable header */
587			*prot = nh; /* meaningless, but set here anyway */
588			return(NULL);
589		}
590	}
591
592	return(NULL);		/* should be notreached, though */
593}
594
595static void
596icmp6_opt_print(const u_char *bp, int resid)
597{
598	const struct nd_opt_hdr *op;
599	const struct nd_opt_hdr *opl;	/* why there's no struct? */
600	const struct nd_opt_prefix_info *opp;
601	const struct icmp6_opts_redirect *opr;
602	const struct nd_opt_mtu *opm;
603	const struct nd_opt_advinterval *opa;
604	const struct nd_opt_homeagent_info *oph;
605	const struct nd_opt_route_info *opri;
606	const u_char *cp, *ep;
607	struct in6_addr in6, *in6p;
608	size_t l;
609
610#define ECHECK(var) if ((u_char *)&(var) > ep - sizeof(var)) return
611
612	cp = bp;
613	/* 'ep' points to the end of available data. */
614	ep = snapend;
615
616	while (cp < ep) {
617		op = (struct nd_opt_hdr *)cp;
618
619		ECHECK(op->nd_opt_len);
620		if (resid <= 0)
621			return;
622		if (op->nd_opt_len == 0)
623			goto trunc;
624		if (cp + (op->nd_opt_len << 3) > ep)
625			goto trunc;
626
627                printf("\n\t  %s option (%u), length %u (%u): ",
628                       tok2str(icmp6_opt_values, "unknown", op->nd_opt_type),
629                       op->nd_opt_type,
630                       op->nd_opt_len << 3,
631                       op->nd_opt_len);
632
633		switch (op->nd_opt_type) {
634		case ND_OPT_SOURCE_LINKADDR:
635			opl = (struct nd_opt_hdr *)op;
636			l = (op->nd_opt_len << 3) - 2;
637			print_lladdr(cp + 2, l);
638			break;
639		case ND_OPT_TARGET_LINKADDR:
640			opl = (struct nd_opt_hdr *)op;
641			l = (op->nd_opt_len << 3) - 2;
642			print_lladdr(cp + 2, l);
643			break;
644		case ND_OPT_PREFIX_INFORMATION:
645			opp = (struct nd_opt_prefix_info *)op;
646			TCHECK(opp->nd_opt_pi_prefix);
647                        printf("%s/%u%s, Flags [%s], valid time %ss",
648                               ip6addr_string(&opp->nd_opt_pi_prefix),
649                               opp->nd_opt_pi_prefix_len,
650                               (op->nd_opt_len != 4) ? "badlen" : "",
651                               bittok2str(icmp6_opt_pi_flag_values, "none", opp->nd_opt_pi_flags_reserved),
652                               get_lifetime(EXTRACT_32BITS(&opp->nd_opt_pi_valid_time)));
653                        printf(", pref. time %ss", get_lifetime(EXTRACT_32BITS(&opp->nd_opt_pi_preferred_time)));
654			break;
655		case ND_OPT_REDIRECTED_HEADER:
656			opr = (struct icmp6_opts_redirect *)op;
657                        print_unknown_data(bp,"\n\t    ",op->nd_opt_len<<3);
658			/* xxx */
659			break;
660		case ND_OPT_MTU:
661			opm = (struct nd_opt_mtu *)op;
662			TCHECK(opm->nd_opt_mtu_mtu);
663			printf(" %u%s",
664                               EXTRACT_32BITS(&opm->nd_opt_mtu_mtu),
665                               (op->nd_opt_len != 1) ? "bad option length" : "" );
666                        break;
667		case ND_OPT_ADVINTERVAL:
668			opa = (struct nd_opt_advinterval *)op;
669			TCHECK(opa->nd_opt_adv_interval);
670			printf(" %us", EXTRACT_32BITS(&opa->nd_opt_adv_interval));
671			break;
672		case ND_OPT_HOMEAGENT_INFO:
673			oph = (struct nd_opt_homeagent_info *)op;
674			TCHECK(oph->nd_opt_hai_lifetime);
675			printf(" preference %u, lifetime %u",
676                               EXTRACT_16BITS(&oph->nd_opt_hai_preference),
677                               EXTRACT_16BITS(&oph->nd_opt_hai_lifetime));
678			break;
679		case ND_OPT_ROUTE_INFO:
680			opri = (struct nd_opt_route_info *)op;
681			TCHECK(opri->nd_opt_rti_lifetime);
682			memset(&in6, 0, sizeof(in6));
683			in6p = (struct in6_addr *)(opri + 1);
684			switch (op->nd_opt_len) {
685			case 1:
686				break;
687			case 2:
688				TCHECK2(*in6p, 8);
689				memcpy(&in6, opri + 1, 8);
690				break;
691			case 3:
692				TCHECK(*in6p);
693				memcpy(&in6, opri + 1, sizeof(in6));
694				break;
695			default:
696				goto trunc;
697			}
698			printf(" %s/%u", ip6addr_string(&in6),
699			    opri->nd_opt_rti_prefixlen);
700			printf(", pref=%s", get_rtpref(opri->nd_opt_rti_flags));
701			printf(", lifetime=%s",
702			    get_lifetime(EXTRACT_32BITS(&opri->nd_opt_rti_lifetime)));
703			break;
704		default:
705                        if (vflag <= 1) {
706                            print_unknown_data(cp+2,"\n\t  ", (op->nd_opt_len << 3) - 2); /* skip option header */
707                            return;
708                        }
709                        break;
710		}
711                /* do we want to see an additional hexdump ? */
712                if (vflag> 1)
713                    print_unknown_data(cp+2,"\n\t    ", (op->nd_opt_len << 3) - 2); /* skip option header */
714
715		cp += op->nd_opt_len << 3;
716		resid -= op->nd_opt_len << 3;
717	}
718	return;
719
720 trunc:
721	fputs("[ndp opt]", stdout);
722	return;
723#undef ECHECK
724}
725
726static void
727mld6_print(const u_char *bp)
728{
729	struct mld6_hdr *mp = (struct mld6_hdr *)bp;
730	const u_char *ep;
731
732	/* 'ep' points to the end of available data. */
733	ep = snapend;
734
735	if ((u_char *)mp + sizeof(*mp) > ep)
736		return;
737
738	printf("max resp delay: %d ", EXTRACT_16BITS(&mp->mld6_maxdelay));
739	printf("addr: %s", ip6addr_string(&mp->mld6_addr));
740}
741
742static void
743mldv2_report_print(const u_char *bp, u_int len)
744{
745    struct icmp6_hdr *icp = (struct icmp6_hdr *) bp;
746    u_int group, nsrcs, ngroups;
747    u_int i, j;
748
749    /* Minimum len is 8 */
750    if (len < 8) {
751	printf(" [invalid len %d]", len);
752	return;
753    }
754
755    TCHECK(icp->icmp6_data16[1]);
756    ngroups = ntohs(icp->icmp6_data16[1]);
757    printf(", %d group record(s)", ngroups);
758    if (vflag > 0) {
759	/* Print the group records */
760	group = 8;
761        for (i = 0; i < ngroups; i++) {
762	    /* type(1) + auxlen(1) + numsrc(2) + grp(16) */
763	    if (len < group + 20) {
764		printf(" [invalid number of groups]");
765		return;
766	    }
767            TCHECK2(bp[group + 4], sizeof(struct in6_addr));
768            printf(" [gaddr %s", ip6addr_string(&bp[group + 4]));
769	    printf(" %s", tok2str(mldv2report2str, " [v2-report-#%d]",
770								bp[group]));
771            nsrcs = (bp[group + 2] << 8) + bp[group + 3];
772	    /* Check the number of sources and print them */
773	    if (len < group + 20 + (nsrcs * sizeof(struct in6_addr))) {
774		printf(" [invalid number of sources %d]", nsrcs);
775		return;
776	    }
777            if (vflag == 1)
778                printf(", %d source(s)", nsrcs);
779            else {
780		/* Print the sources */
781                (void)printf(" {");
782                for (j = 0; j < nsrcs; j++) {
783                    TCHECK2(bp[group + 20 + j * sizeof(struct in6_addr)],
784                            sizeof(struct in6_addr));
785		    printf(" %s", ip6addr_string(&bp[group + 20 + j * sizeof(struct in6_addr)]));
786		}
787                (void)printf(" }");
788            }
789	    /* Next group record */
790            group += 20 + nsrcs * sizeof(struct in6_addr);
791	    printf("]");
792        }
793    }
794    return;
795trunc:
796    (void)printf("[|icmp6]");
797    return;
798}
799
800static void
801mldv2_query_print(const u_char *bp, u_int len)
802{
803    struct icmp6_hdr *icp = (struct icmp6_hdr *) bp;
804    u_int mrc;
805    int mrt, qqi;
806    u_int nsrcs;
807    register u_int i;
808
809    /* Minimum len is 28 */
810    if (len < 28) {
811	printf(" [invalid len %d]", len);
812	return;
813    }
814    TCHECK(icp->icmp6_data16[0]);
815    mrc = ntohs(icp->icmp6_data16[0]);
816    if (mrc < 32768) {
817	mrt = mrc;
818    } else {
819        mrt = ((mrc & 0x0fff) | 0x1000) << (((mrc & 0x7000) >> 12) + 3);
820    }
821    if (vflag) {
822	(void)printf(" [max resp delay=%d]", mrt);
823    }
824    TCHECK2(bp[8], sizeof(struct in6_addr));
825    printf(" [gaddr %s", ip6addr_string(&bp[8]));
826
827    if (vflag) {
828        TCHECK(bp[25]);
829	if (bp[24] & 0x08) {
830		printf(" sflag");
831	}
832	if (bp[24] & 0x07) {
833		printf(" robustness=%d", bp[24] & 0x07);
834	}
835	if (bp[25] < 128) {
836		qqi = bp[25];
837	} else {
838		qqi = ((bp[25] & 0x0f) | 0x10) << (((bp[25] & 0x70) >> 4) + 3);
839	}
840	printf(" qqi=%d", qqi);
841    }
842
843    TCHECK2(bp[26], 2);
844    nsrcs = ntohs(*(u_short *)&bp[26]);
845    if (nsrcs > 0) {
846	if (len < 28 + nsrcs * sizeof(struct in6_addr))
847	    printf(" [invalid number of sources]");
848	else if (vflag > 1) {
849	    printf(" {");
850	    for (i = 0; i < nsrcs; i++) {
851		TCHECK2(bp[28 + i * sizeof(struct in6_addr)],
852                        sizeof(struct in6_addr));
853		printf(" %s", ip6addr_string(&bp[28 + i * sizeof(struct in6_addr)]));
854	    }
855	    printf(" }");
856	} else
857	    printf(", %d source(s)", nsrcs);
858    }
859    printf("]");
860    return;
861trunc:
862    (void)printf("[|icmp6]");
863    return;
864}
865
866void
867dnsname_print(const u_char *cp, const u_char *ep)
868{
869	int i;
870
871	/* DNS name decoding - no decompression */
872	printf(", \"");
873	while (cp < ep) {
874		i = *cp++;
875		if (i) {
876			if (i > ep - cp) {
877				printf("???");
878				break;
879			}
880			while (i-- && cp < ep) {
881				safeputchar(*cp);
882				cp++;
883			}
884			if (cp + 1 < ep && *cp)
885				printf(".");
886		} else {
887			if (cp == ep) {
888				/* FQDN */
889				printf(".");
890			} else if (cp + 1 == ep && *cp == '\0') {
891				/* truncated */
892			} else {
893				/* invalid */
894				printf("???");
895			}
896			break;
897		}
898	}
899	printf("\"");
900}
901
902static void
903icmp6_nodeinfo_print(u_int icmp6len, const u_char *bp, const u_char *ep)
904{
905	struct icmp6_nodeinfo *ni6;
906	struct icmp6_hdr *dp;
907	const u_char *cp;
908	size_t siz, i;
909	int needcomma;
910
911	if (ep < bp)
912		return;
913	dp = (struct icmp6_hdr *)bp;
914	ni6 = (struct icmp6_nodeinfo *)bp;
915	siz = ep - bp;
916
917	switch (ni6->ni_type) {
918	case ICMP6_NI_QUERY:
919		if (siz == sizeof(*dp) + 4) {
920			/* KAME who-are-you */
921			printf(" who-are-you request");
922			break;
923		}
924		printf(" node information query");
925
926		TCHECK2(*dp, sizeof(*ni6));
927		ni6 = (struct icmp6_nodeinfo *)dp;
928		printf(" (");	/*)*/
929		switch (EXTRACT_16BITS(&ni6->ni_qtype)) {
930		case NI_QTYPE_NOOP:
931			printf("noop");
932			break;
933		case NI_QTYPE_SUPTYPES:
934			printf("supported qtypes");
935			i = EXTRACT_16BITS(&ni6->ni_flags);
936			if (i)
937				printf(" [%s]", (i & 0x01) ? "C" : "");
938			break;
939			break;
940		case NI_QTYPE_FQDN:
941			printf("DNS name");
942			break;
943		case NI_QTYPE_NODEADDR:
944			printf("node addresses");
945			i = ni6->ni_flags;
946			if (!i)
947				break;
948			/* NI_NODEADDR_FLAG_TRUNCATE undefined for query */
949			printf(" [%s%s%s%s%s%s]",
950			    (i & NI_NODEADDR_FLAG_ANYCAST) ? "a" : "",
951			    (i & NI_NODEADDR_FLAG_GLOBAL) ? "G" : "",
952			    (i & NI_NODEADDR_FLAG_SITELOCAL) ? "S" : "",
953			    (i & NI_NODEADDR_FLAG_LINKLOCAL) ? "L" : "",
954			    (i & NI_NODEADDR_FLAG_COMPAT) ? "C" : "",
955			    (i & NI_NODEADDR_FLAG_ALL) ? "A" : "");
956			break;
957		default:
958			printf("unknown");
959			break;
960		}
961
962		if (ni6->ni_qtype == NI_QTYPE_NOOP ||
963		    ni6->ni_qtype == NI_QTYPE_SUPTYPES) {
964			if (siz != sizeof(*ni6))
965				if (vflag)
966					printf(", invalid len");
967			/*(*/
968			printf(")");
969			break;
970		}
971
972
973		/* XXX backward compat, icmp-name-lookup-03 */
974		if (siz == sizeof(*ni6)) {
975			printf(", 03 draft");
976			/*(*/
977			printf(")");
978			break;
979		}
980
981		switch (ni6->ni_code) {
982		case ICMP6_NI_SUBJ_IPV6:
983			if (!TTEST2(*dp,
984			    sizeof(*ni6) + sizeof(struct in6_addr)))
985				break;
986			if (siz != sizeof(*ni6) + sizeof(struct in6_addr)) {
987				if (vflag)
988					printf(", invalid subject len");
989				break;
990			}
991			printf(", subject=%s",
992			    getname6((const u_char *)(ni6 + 1)));
993			break;
994		case ICMP6_NI_SUBJ_FQDN:
995			printf(", subject=DNS name");
996			cp = (const u_char *)(ni6 + 1);
997			if (cp[0] == ep - cp - 1) {
998				/* icmp-name-lookup-03, pascal string */
999				if (vflag)
1000					printf(", 03 draft");
1001				cp++;
1002				printf(", \"");
1003				while (cp < ep) {
1004					safeputchar(*cp);
1005					cp++;
1006				}
1007				printf("\"");
1008			} else
1009				dnsname_print(cp, ep);
1010			break;
1011		case ICMP6_NI_SUBJ_IPV4:
1012			if (!TTEST2(*dp, sizeof(*ni6) + sizeof(struct in_addr)))
1013				break;
1014			if (siz != sizeof(*ni6) + sizeof(struct in_addr)) {
1015				if (vflag)
1016					printf(", invalid subject len");
1017				break;
1018			}
1019			printf(", subject=%s",
1020			    getname((const u_char *)(ni6 + 1)));
1021			break;
1022		default:
1023			printf(", unknown subject");
1024			break;
1025		}
1026
1027		/*(*/
1028		printf(")");
1029		break;
1030
1031	case ICMP6_NI_REPLY:
1032		if (icmp6len > siz) {
1033			printf("[|icmp6: node information reply]");
1034			break;
1035		}
1036
1037		needcomma = 0;
1038
1039		ni6 = (struct icmp6_nodeinfo *)dp;
1040		printf(" node information reply");
1041		printf(" (");	/*)*/
1042		switch (ni6->ni_code) {
1043		case ICMP6_NI_SUCCESS:
1044			if (vflag) {
1045				printf("success");
1046				needcomma++;
1047			}
1048			break;
1049		case ICMP6_NI_REFUSED:
1050			printf("refused");
1051			needcomma++;
1052			if (siz != sizeof(*ni6))
1053				if (vflag)
1054					printf(", invalid length");
1055			break;
1056		case ICMP6_NI_UNKNOWN:
1057			printf("unknown");
1058			needcomma++;
1059			if (siz != sizeof(*ni6))
1060				if (vflag)
1061					printf(", invalid length");
1062			break;
1063		}
1064
1065		if (ni6->ni_code != ICMP6_NI_SUCCESS) {
1066			/*(*/
1067			printf(")");
1068			break;
1069		}
1070
1071		switch (EXTRACT_16BITS(&ni6->ni_qtype)) {
1072		case NI_QTYPE_NOOP:
1073			if (needcomma)
1074				printf(", ");
1075			printf("noop");
1076			if (siz != sizeof(*ni6))
1077				if (vflag)
1078					printf(", invalid length");
1079			break;
1080		case NI_QTYPE_SUPTYPES:
1081			if (needcomma)
1082				printf(", ");
1083			printf("supported qtypes");
1084			i = EXTRACT_16BITS(&ni6->ni_flags);
1085			if (i)
1086				printf(" [%s]", (i & 0x01) ? "C" : "");
1087			break;
1088		case NI_QTYPE_FQDN:
1089			if (needcomma)
1090				printf(", ");
1091			printf("DNS name");
1092			cp = (const u_char *)(ni6 + 1) + 4;
1093			if (cp[0] == ep - cp - 1) {
1094				/* icmp-name-lookup-03, pascal string */
1095				if (vflag)
1096					printf(", 03 draft");
1097				cp++;
1098				printf(", \"");
1099				while (cp < ep) {
1100					safeputchar(*cp);
1101					cp++;
1102				}
1103				printf("\"");
1104			} else
1105				dnsname_print(cp, ep);
1106			if ((EXTRACT_16BITS(&ni6->ni_flags) & 0x01) != 0)
1107				printf(" [TTL=%u]", *(u_int32_t *)(ni6 + 1));
1108			break;
1109		case NI_QTYPE_NODEADDR:
1110			if (needcomma)
1111				printf(", ");
1112			printf("node addresses");
1113			i = sizeof(*ni6);
1114			while (i < siz) {
1115				if (i + sizeof(struct in6_addr) + sizeof(int32_t) > siz)
1116					break;
1117				printf(" %s", getname6(bp + i));
1118				i += sizeof(struct in6_addr);
1119				printf("(%d)", (int32_t)EXTRACT_32BITS(bp + i));
1120				i += sizeof(int32_t);
1121			}
1122			i = ni6->ni_flags;
1123			if (!i)
1124				break;
1125			printf(" [%s%s%s%s%s%s%s]",
1126			    (i & NI_NODEADDR_FLAG_ANYCAST) ? "a" : "",
1127			    (i & NI_NODEADDR_FLAG_GLOBAL) ? "G" : "",
1128			    (i & NI_NODEADDR_FLAG_SITELOCAL) ? "S" : "",
1129			    (i & NI_NODEADDR_FLAG_LINKLOCAL) ? "L" : "",
1130			    (i & NI_NODEADDR_FLAG_COMPAT) ? "C" : "",
1131			    (i & NI_NODEADDR_FLAG_ALL) ? "A" : "",
1132			    (i & NI_NODEADDR_FLAG_TRUNCATE) ? "T" : "");
1133			break;
1134		default:
1135			if (needcomma)
1136				printf(", ");
1137			printf("unknown");
1138			break;
1139		}
1140
1141		/*(*/
1142		printf(")");
1143		break;
1144	}
1145	return;
1146
1147trunc:
1148	fputs("[|icmp6]", stdout);
1149}
1150
1151static void
1152icmp6_rrenum_print(const u_char *bp, const u_char *ep)
1153{
1154	struct icmp6_router_renum *rr6;
1155	const char *cp;
1156	struct rr_pco_match *match;
1157	struct rr_pco_use *use;
1158	char hbuf[NI_MAXHOST];
1159	int n;
1160
1161	if (ep < bp)
1162		return;
1163	rr6 = (struct icmp6_router_renum *)bp;
1164	cp = (const char *)(rr6 + 1);
1165
1166	TCHECK(rr6->rr_reserved);
1167	switch (rr6->rr_code) {
1168	case ICMP6_ROUTER_RENUMBERING_COMMAND:
1169		printf("router renum: command");
1170		break;
1171	case ICMP6_ROUTER_RENUMBERING_RESULT:
1172		printf("router renum: result");
1173		break;
1174	case ICMP6_ROUTER_RENUMBERING_SEQNUM_RESET:
1175		printf("router renum: sequence number reset");
1176		break;
1177	default:
1178		printf("router renum: code-#%d", rr6->rr_code);
1179		break;
1180	}
1181
1182	printf(", seq=%u", EXTRACT_32BITS(&rr6->rr_seqnum));
1183
1184	if (vflag) {
1185#define F(x, y)	((rr6->rr_flags) & (x) ? (y) : "")
1186		printf("[");	/*]*/
1187		if (rr6->rr_flags) {
1188			printf("%s%s%s%s%s,", F(ICMP6_RR_FLAGS_TEST, "T"),
1189			    F(ICMP6_RR_FLAGS_REQRESULT, "R"),
1190			    F(ICMP6_RR_FLAGS_FORCEAPPLY, "A"),
1191			    F(ICMP6_RR_FLAGS_SPECSITE, "S"),
1192			    F(ICMP6_RR_FLAGS_PREVDONE, "P"));
1193		}
1194		printf("seg=%u,", rr6->rr_segnum);
1195		printf("maxdelay=%u", rr6->rr_maxdelay);
1196		if (rr6->rr_reserved)
1197			printf("rsvd=0x%x", EXTRACT_16BITS(&rr6->rr_reserved));
1198		/*[*/
1199		printf("]");
1200#undef F
1201	}
1202
1203	if (rr6->rr_code == ICMP6_ROUTER_RENUMBERING_COMMAND) {
1204		match = (struct rr_pco_match *)cp;
1205		cp = (const char *)(match + 1);
1206
1207		TCHECK(match->rpm_prefix);
1208
1209		if (vflag > 1)
1210			printf("\n\t");
1211		else
1212			printf(" ");
1213		printf("match(");	/*)*/
1214		switch (match->rpm_code) {
1215		case RPM_PCO_ADD:	printf("add"); break;
1216		case RPM_PCO_CHANGE:	printf("change"); break;
1217		case RPM_PCO_SETGLOBAL:	printf("setglobal"); break;
1218		default:		printf("#%u", match->rpm_code); break;
1219		}
1220
1221		if (vflag) {
1222			printf(",ord=%u", match->rpm_ordinal);
1223			printf(",min=%u", match->rpm_minlen);
1224			printf(",max=%u", match->rpm_maxlen);
1225		}
1226		if (inet_ntop(AF_INET6, &match->rpm_prefix, hbuf, sizeof(hbuf)))
1227			printf(",%s/%u", hbuf, match->rpm_matchlen);
1228		else
1229			printf(",?/%u", match->rpm_matchlen);
1230		/*(*/
1231		printf(")");
1232
1233		n = match->rpm_len - 3;
1234		if (n % 4)
1235			goto trunc;
1236		n /= 4;
1237		while (n-- > 0) {
1238			use = (struct rr_pco_use *)cp;
1239			cp = (const char *)(use + 1);
1240
1241			TCHECK(use->rpu_prefix);
1242
1243			if (vflag > 1)
1244				printf("\n\t");
1245			else
1246				printf(" ");
1247			printf("use(");	/*)*/
1248			if (use->rpu_flags) {
1249#define F(x, y)	((use->rpu_flags) & (x) ? (y) : "")
1250				printf("%s%s,",
1251				    F(ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME, "V"),
1252				    F(ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME, "P"));
1253#undef F
1254			}
1255			if (vflag) {
1256				printf("mask=0x%x,", use->rpu_ramask);
1257				printf("raflags=0x%x,", use->rpu_raflags);
1258				if (~use->rpu_vltime == 0)
1259					printf("vltime=infty,");
1260				else
1261					printf("vltime=%u,",
1262					    EXTRACT_32BITS(&use->rpu_vltime));
1263				if (~use->rpu_pltime == 0)
1264					printf("pltime=infty,");
1265				else
1266					printf("pltime=%u,",
1267					    EXTRACT_32BITS(&use->rpu_pltime));
1268			}
1269			if (inet_ntop(AF_INET6, &use->rpu_prefix, hbuf,
1270			    sizeof(hbuf)))
1271				printf("%s/%u/%u", hbuf, use->rpu_uselen,
1272				    use->rpu_keeplen);
1273			else
1274				printf("?/%u/%u", use->rpu_uselen,
1275				    use->rpu_keeplen);
1276			/*(*/
1277			printf(")");
1278		}
1279	}
1280
1281	return;
1282
1283trunc:
1284	fputs("[|icmp6]", stdout);
1285}
1286
1287#endif /* INET6 */
1288