print-icmp6.c revision 236192 
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 1.86 2008-02-05 19:36:13 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
65/* inline the various RPL definitions */
66#define ND_RPL_MESSAGE 0x9B
67
68static struct tok icmp6_type_values[] = {
69    { ICMP6_DST_UNREACH, "destination unreachable"},
70    { ICMP6_PACKET_TOO_BIG, "packet too big"},
71    { ICMP6_TIME_EXCEEDED, "time exceeded in-transit"},
72    { ICMP6_PARAM_PROB, "parameter problem"},
73    { ICMP6_ECHO_REQUEST, "echo request"},
74    { ICMP6_ECHO_REPLY, "echo reply"},
75    { MLD6_LISTENER_QUERY, "multicast listener query"},
76    { MLD6_LISTENER_REPORT, "multicast listener report"},
77    { MLD6_LISTENER_DONE, "multicast listener done"},
78    { ND_ROUTER_SOLICIT, "router solicitation"},
79    { ND_ROUTER_ADVERT, "router advertisement"},
80    { ND_NEIGHBOR_SOLICIT, "neighbor solicitation"},
81    { ND_NEIGHBOR_ADVERT, "neighbor advertisement"},
82    { ND_REDIRECT, "redirect"},
83    { ICMP6_ROUTER_RENUMBERING, "router renumbering"},
84    { IND_SOLICIT, "inverse neighbor solicitation"},
85    { IND_ADVERT, "inverse neighbor advertisement"},
86    { MLDV2_LISTENER_REPORT, "multicast listener report v2"},
87    { ICMP6_HADISCOV_REQUEST, "ha discovery request"},
88    { ICMP6_HADISCOV_REPLY, "ha discovery reply"},
89    { ICMP6_MOBILEPREFIX_SOLICIT, "mobile router solicitation"},
90    { ICMP6_MOBILEPREFIX_ADVERT, "mobile router advertisement"},
91    { ICMP6_WRUREQUEST, "who-are-you request"},
92    { ICMP6_WRUREPLY, "who-are-you reply"},
93    { ICMP6_NI_QUERY, "node information query"},
94    { ICMP6_NI_REPLY, "node information reply"},
95    { MLD6_MTRACE, "mtrace message"},
96    { MLD6_MTRACE_RESP, "mtrace response"},
97    { ND_RPL_MESSAGE,   "RPL"},
98    { 0,	NULL }
99};
100
101static struct tok icmp6_dst_unreach_code_values[] = {
102    { ICMP6_DST_UNREACH_NOROUTE, "unreachable route" },
103    { ICMP6_DST_UNREACH_ADMIN, " unreachable prohibited"},
104    { ICMP6_DST_UNREACH_BEYONDSCOPE, "beyond scope"},
105    { ICMP6_DST_UNREACH_ADDR, "unreachable address"},
106    { ICMP6_DST_UNREACH_NOPORT, "unreachable port"},
107    { 0,	NULL }
108};
109
110static struct tok icmp6_opt_pi_flag_values[] = {
111    { ND_OPT_PI_FLAG_ONLINK, "onlink" },
112    { ND_OPT_PI_FLAG_AUTO, "auto" },
113    { ND_OPT_PI_FLAG_ROUTER, "router" },
114    { 0,	NULL }
115};
116
117static struct tok icmp6_opt_ra_flag_values[] = {
118    { ND_RA_FLAG_MANAGED, "managed" },
119    { ND_RA_FLAG_OTHER, "other stateful"},
120    { ND_RA_FLAG_HOME_AGENT, "home agent"},
121    { 0,	NULL }
122};
123
124static struct tok icmp6_nd_na_flag_values[] = {
125    { ND_NA_FLAG_ROUTER, "router" },
126    { ND_NA_FLAG_SOLICITED, "solicited" },
127    { ND_NA_FLAG_OVERRIDE, "override" },
128    { 0,	NULL }
129};
130
131
132static struct tok icmp6_opt_values[] = {
133   { ND_OPT_SOURCE_LINKADDR, "source link-address"},
134   { ND_OPT_TARGET_LINKADDR, "destination link-address"},
135   { ND_OPT_PREFIX_INFORMATION, "prefix info"},
136   { ND_OPT_REDIRECTED_HEADER, "redirected header"},
137   { ND_OPT_MTU, "mtu"},
138   { ND_OPT_RDNSS, "rdnss"},
139   { ND_OPT_ADVINTERVAL, "advertisement interval"},
140   { ND_OPT_HOMEAGENT_INFO, "homeagent information"},
141   { ND_OPT_ROUTE_INFO, "route info"},
142   { 0,	NULL }
143};
144
145/* mldv2 report types */
146static struct tok mldv2report2str[] = {
147	{ 1,	"is_in" },
148	{ 2,	"is_ex" },
149	{ 3,	"to_in" },
150	{ 4,	"to_ex" },
151	{ 5,	"allow" },
152	{ 6,	"block" },
153	{ 0,	NULL }
154};
155
156static const char *
157get_rtpref(u_int v)
158{
159	static const char *rtpref_str[] = {
160		"medium",		/* 00 */
161		"high",			/* 01 */
162		"rsv",			/* 10 */
163		"low"			/* 11 */
164	};
165
166	return rtpref_str[((v & ND_RA_FLAG_RTPREF_MASK) >> 3) & 0xff];
167}
168
169static const char *
170get_lifetime(u_int32_t v)
171{
172	static char buf[20];
173
174	if (v == (u_int32_t)~0UL)
175		return "infinity";
176	else {
177		snprintf(buf, sizeof(buf), "%u", v);
178		return buf;
179	}
180}
181
182static void
183print_lladdr(const u_int8_t *p, size_t l)
184{
185	const u_int8_t *ep, *q;
186
187	q = p;
188	ep = p + l;
189	while (l > 0 && q < ep) {
190		if (q > p)
191			printf(":");
192		printf("%02x", *q++);
193		l--;
194	}
195}
196
197static int icmp6_cksum(const struct ip6_hdr *ip6, const struct icmp6_hdr *icp,
198	u_int len)
199{
200	return (nextproto6_cksum(ip6, (const u_int8_t *)(void *)icp, len,
201	    IPPROTO_ICMPV6));
202}
203
204enum ND_RPL_CODE {
205        ND_RPL_DIS   =0x00,
206        ND_RPL_DIO   =0x01,
207        ND_RPL_DAO   =0x02,
208        ND_RPL_DAO_ACK=0x03,
209        ND_RPL_SDIS  =0x80,
210        ND_RPL_SDIO  =0x81,
211        ND_RPL_SDAO  =0x82,
212        ND_RPL_SDAO_ACK=0x83,
213        ND_RPL_SCC   =0x8A,
214};
215
216enum ND_RPL_DIO_FLAGS {
217        ND_RPL_DIO_GROUNDED = 0x80,
218        ND_RPL_DIO_DATRIG   = 0x40,
219        ND_RPL_DIO_DASUPPORT= 0x20,
220        ND_RPL_DIO_RES4     = 0x10,
221        ND_RPL_DIO_RES3     = 0x08,
222        ND_RPL_DIO_PRF_MASK = 0x07,  /* 3-bit preference */
223};
224
225struct nd_rpl_dio {
226        u_int8_t rpl_flags;
227        u_int8_t rpl_seq;
228        u_int8_t rpl_instanceid;
229        u_int8_t rpl_dagrank;
230        u_int8_t rpl_dagid[16];
231};
232
233static void
234rpl_print(netdissect_options *ndo,
235          const struct icmp6_hdr *hdr,
236          const u_char *bp, u_int length _U_)
237{
238        struct nd_rpl_dio *dio = (struct nd_rpl_dio *)bp;
239        int secured = hdr->icmp6_code & 0x80;
240        int basecode= hdr->icmp6_code & 0x7f;
241
242        ND_TCHECK(dio->rpl_dagid);
243
244        if(secured) {
245                ND_PRINT((ndo, ", (SEC)"));
246        } else {
247                ND_PRINT((ndo, ", (CLR)"));
248        }
249
250        switch(basecode) {
251        case ND_RPL_DIS:
252                ND_PRINT((ndo, "DODAG Information Solicitation"));
253                if(ndo->ndo_vflag) {
254                }
255                break;
256        case ND_RPL_DIO:
257                ND_PRINT((ndo, "DODAG Information Object"));
258                if(ndo->ndo_vflag) {
259                        char dagid[65];
260                        char *d = dagid;
261                        int  i;
262                        for(i=0;i<16;i++) {
263                                if(isprint(dio->rpl_dagid[i])) {
264                                        *d++ = dio->rpl_dagid[i];
265                                } else {
266                                        int cnt=snprintf(d,4,"0x%02x",
267                                                         dio->rpl_dagid[i]);
268                                        d += cnt;
269                                }
270                        }
271                        *d++ = '\0';
272                        ND_PRINT((ndo, " [seq:%u,instance:%u,rank:%u,dagid:%s]",
273                                  dio->rpl_seq,
274                                  dio->rpl_instanceid,
275                                  dio->rpl_dagrank,
276                                  dagid));
277                }
278                break;
279        case ND_RPL_DAO:
280                ND_PRINT((ndo, "Destination Advertisement Object"));
281                if(ndo->ndo_vflag) {
282                }
283                break;
284        case ND_RPL_DAO_ACK:
285                ND_PRINT((ndo, "Destination Advertisement Object Ack"));
286                if(ndo->ndo_vflag) {
287                }
288                break;
289        default:
290                ND_PRINT((ndo, "RPL message, unknown code %u",hdr->icmp6_code));
291                break;
292        }
293	return;
294trunc:
295	ND_PRINT((ndo," [|truncated]"));
296	return;
297
298}
299
300
301void
302icmp6_print(netdissect_options *ndo,
303            const u_char *bp, u_int length, const u_char *bp2, int fragmented)
304{
305	const struct icmp6_hdr *dp;
306	const struct ip6_hdr *ip;
307	const struct ip6_hdr *oip;
308	const struct udphdr *ouh;
309	int dport;
310	const u_char *ep;
311	u_int prot;
312
313	dp = (struct icmp6_hdr *)bp;
314	ip = (struct ip6_hdr *)bp2;
315	oip = (struct ip6_hdr *)(dp + 1);
316	/* 'ep' points to the end of available data. */
317	ep = snapend;
318
319	TCHECK(dp->icmp6_cksum);
320
321	if (vflag && !fragmented) {
322		u_int16_t sum, udp_sum;
323
324		if (TTEST2(bp[0], length)) {
325			udp_sum = EXTRACT_16BITS(&dp->icmp6_cksum);
326			sum = icmp6_cksum(ip, dp, length);
327			if (sum != 0)
328				(void)printf("[bad icmp6 cksum 0x%04x -> 0x%04x!] ",
329				    udp_sum,
330				    in_cksum_shouldbe(udp_sum, sum));
331			else
332				(void)printf("[icmp6 sum ok] ");
333		}
334	}
335
336        printf("ICMP6, %s", tok2str(icmp6_type_values,"unknown icmp6 type (%u)",dp->icmp6_type));
337
338        /* display cosmetics: print the packet length for printer that use the vflag now */
339        if (vflag && (dp->icmp6_type == ND_ROUTER_SOLICIT ||
340                      dp->icmp6_type == ND_ROUTER_ADVERT ||
341                      dp->icmp6_type == ND_NEIGHBOR_ADVERT ||
342                      dp->icmp6_type == ND_NEIGHBOR_SOLICIT ||
343                      dp->icmp6_type == ND_REDIRECT ||
344                      dp->icmp6_type == ICMP6_HADISCOV_REPLY ||
345                      dp->icmp6_type == ICMP6_MOBILEPREFIX_ADVERT ))
346            printf(", length %u", length);
347
348	switch (dp->icmp6_type) {
349	case ICMP6_DST_UNREACH:
350		TCHECK(oip->ip6_dst);
351                printf(", %s", tok2str(icmp6_dst_unreach_code_values,"unknown unreach code (%u)",dp->icmp6_code));
352		switch (dp->icmp6_code) {
353
354		case ICMP6_DST_UNREACH_NOROUTE: /* fall through */
355		case ICMP6_DST_UNREACH_ADMIN:
356		case ICMP6_DST_UNREACH_ADDR:
357                        printf(" %s",ip6addr_string(&oip->ip6_dst));
358                        break;
359		case ICMP6_DST_UNREACH_BEYONDSCOPE:
360			printf(" %s, source address %s",
361			       ip6addr_string(&oip->ip6_dst),
362			       ip6addr_string(&oip->ip6_src));
363			break;
364		case ICMP6_DST_UNREACH_NOPORT:
365			if ((ouh = get_upperlayer((u_char *)oip, &prot))
366			    == NULL)
367				goto trunc;
368
369			dport = EXTRACT_16BITS(&ouh->uh_dport);
370			switch (prot) {
371			case IPPROTO_TCP:
372				printf(", %s tcp port %s",
373					ip6addr_string(&oip->ip6_dst),
374					tcpport_string(dport));
375				break;
376			case IPPROTO_UDP:
377				printf(", %s udp port %s",
378					ip6addr_string(&oip->ip6_dst),
379					udpport_string(dport));
380				break;
381			default:
382				printf(", %s protocol %d port %d unreachable",
383					ip6addr_string(&oip->ip6_dst),
384					oip->ip6_nxt, dport);
385				break;
386			}
387			break;
388		default:
389                    if (vflag <= 1) {
390                            print_unknown_data(bp,"\n\t",length);
391                            return;
392                    }
393                    break;
394		}
395		break;
396	case ICMP6_PACKET_TOO_BIG:
397		TCHECK(dp->icmp6_mtu);
398		printf(", mtu %u", EXTRACT_32BITS(&dp->icmp6_mtu));
399		break;
400	case ICMP6_TIME_EXCEEDED:
401		TCHECK(oip->ip6_dst);
402		switch (dp->icmp6_code) {
403		case ICMP6_TIME_EXCEED_TRANSIT:
404			printf(" for %s",
405				ip6addr_string(&oip->ip6_dst));
406			break;
407		case ICMP6_TIME_EXCEED_REASSEMBLY:
408			printf(" (reassembly)");
409			break;
410		default:
411			printf(", unknown code (%u)", dp->icmp6_code);
412			break;
413		}
414		break;
415	case ICMP6_PARAM_PROB:
416		TCHECK(oip->ip6_dst);
417		switch (dp->icmp6_code) {
418		case ICMP6_PARAMPROB_HEADER:
419			printf(", errorneous - octet %u", EXTRACT_32BITS(&dp->icmp6_pptr));
420			break;
421		case ICMP6_PARAMPROB_NEXTHEADER:
422			printf(", next header - octet %u", EXTRACT_32BITS(&dp->icmp6_pptr));
423			break;
424		case ICMP6_PARAMPROB_OPTION:
425			printf(", option - octet %u", EXTRACT_32BITS(&dp->icmp6_pptr));
426			break;
427		default:
428			printf(", code-#%d",
429			       dp->icmp6_code);
430			break;
431		}
432		break;
433	case ICMP6_ECHO_REQUEST:
434	case ICMP6_ECHO_REPLY:
435		TCHECK(dp->icmp6_seq);
436		printf(", seq %u", EXTRACT_16BITS(&dp->icmp6_seq));
437		break;
438	case ICMP6_MEMBERSHIP_QUERY:
439		if (length == MLD_MINLEN) {
440			mld6_print((const u_char *)dp);
441		} else if (length >= MLDV2_MINLEN) {
442			printf("v2 ");
443			mldv2_query_print((const u_char *)dp, length);
444		} else {
445			printf(" unknown-version (len %u) ", length);
446		}
447		break;
448	case ICMP6_MEMBERSHIP_REPORT:
449		mld6_print((const u_char *)dp);
450		break;
451	case ICMP6_MEMBERSHIP_REDUCTION:
452		mld6_print((const u_char *)dp);
453		break;
454	case ND_ROUTER_SOLICIT:
455#define RTSOLLEN 8
456		if (vflag) {
457			icmp6_opt_print((const u_char *)dp + RTSOLLEN,
458					length - RTSOLLEN);
459		}
460		break;
461	case ND_ROUTER_ADVERT:
462#define RTADVLEN 16
463		if (vflag) {
464			struct nd_router_advert *p;
465
466			p = (struct nd_router_advert *)dp;
467			TCHECK(p->nd_ra_retransmit);
468			printf("\n\thop limit %u, Flags [%s]" \
469                               ", pref %s, router lifetime %us, reachable time %us, retrans time %us",
470                               (u_int)p->nd_ra_curhoplimit,
471                               bittok2str(icmp6_opt_ra_flag_values,"none",(p->nd_ra_flags_reserved)),
472                               get_rtpref(p->nd_ra_flags_reserved),
473                               EXTRACT_16BITS(&p->nd_ra_router_lifetime),
474                               EXTRACT_32BITS(&p->nd_ra_reachable),
475                               EXTRACT_32BITS(&p->nd_ra_retransmit));
476
477			icmp6_opt_print((const u_char *)dp + RTADVLEN,
478					length - RTADVLEN);
479		}
480		break;
481	case ND_NEIGHBOR_SOLICIT:
482	    {
483		struct nd_neighbor_solicit *p;
484		p = (struct nd_neighbor_solicit *)dp;
485		TCHECK(p->nd_ns_target);
486		printf(", who has %s", ip6addr_string(&p->nd_ns_target));
487		if (vflag) {
488#define NDSOLLEN 24
489			icmp6_opt_print((const u_char *)dp + NDSOLLEN,
490					length - NDSOLLEN);
491		}
492	    }
493		break;
494	case ND_NEIGHBOR_ADVERT:
495	    {
496		struct nd_neighbor_advert *p;
497
498		p = (struct nd_neighbor_advert *)dp;
499		TCHECK(p->nd_na_target);
500		printf(", tgt is %s",
501			ip6addr_string(&p->nd_na_target));
502		if (vflag) {
503                        printf(", Flags [%s]",
504                               bittok2str(icmp6_nd_na_flag_values,
505                                          "none",
506                                          EXTRACT_32BITS(&p->nd_na_flags_reserved)));
507#define NDADVLEN 24
508			icmp6_opt_print((const u_char *)dp + NDADVLEN,
509					length - NDADVLEN);
510#undef NDADVLEN
511		}
512	    }
513		break;
514	case ND_REDIRECT:
515#define RDR(i) ((struct nd_redirect *)(i))
516		TCHECK(RDR(dp)->nd_rd_dst);
517		printf(", %s", getname6((const u_char *)&RDR(dp)->nd_rd_dst));
518		TCHECK(RDR(dp)->nd_rd_target);
519		printf(" to %s",
520		    getname6((const u_char*)&RDR(dp)->nd_rd_target));
521#define REDIRECTLEN 40
522		if (vflag) {
523			icmp6_opt_print((const u_char *)dp + REDIRECTLEN,
524					length - REDIRECTLEN);
525		}
526		break;
527#undef REDIRECTLEN
528#undef RDR
529	case ICMP6_ROUTER_RENUMBERING:
530		icmp6_rrenum_print(bp, ep);
531		break;
532	case ICMP6_NI_QUERY:
533	case ICMP6_NI_REPLY:
534		icmp6_nodeinfo_print(length, bp, ep);
535		break;
536	case IND_SOLICIT:
537	case IND_ADVERT:
538		break;
539	case ICMP6_V2_MEMBERSHIP_REPORT:
540		mldv2_report_print((const u_char *) dp, length);
541		break;
542	case ICMP6_MOBILEPREFIX_SOLICIT: /* fall through */
543	case ICMP6_HADISCOV_REQUEST:
544                TCHECK(dp->icmp6_data16[0]);
545                printf(", id 0x%04x", EXTRACT_16BITS(&dp->icmp6_data16[0]));
546                break;
547	case ICMP6_HADISCOV_REPLY:
548		if (vflag) {
549			struct in6_addr *in6;
550			u_char *cp;
551
552			TCHECK(dp->icmp6_data16[0]);
553			printf(", id 0x%04x", EXTRACT_16BITS(&dp->icmp6_data16[0]));
554			cp = (u_char *)dp + length;
555			in6 = (struct in6_addr *)(dp + 1);
556			for (; (u_char *)in6 < cp; in6++) {
557				TCHECK(*in6);
558				printf(", %s", ip6addr_string(in6));
559			}
560		}
561		break;
562	case ICMP6_MOBILEPREFIX_ADVERT:
563		if (vflag) {
564			TCHECK(dp->icmp6_data16[0]);
565			printf(", id 0x%04x", EXTRACT_16BITS(&dp->icmp6_data16[0]));
566			if (dp->icmp6_data16[1] & 0xc0)
567				printf(" ");
568			if (dp->icmp6_data16[1] & 0x80)
569				printf("M");
570			if (dp->icmp6_data16[1] & 0x40)
571				printf("O");
572#define MPADVLEN 8
573			icmp6_opt_print((const u_char *)dp + MPADVLEN,
574					length - MPADVLEN);
575		}
576		break;
577        case ND_RPL_MESSAGE:
578                rpl_print(ndo, dp, &dp->icmp6_data8[0], length);
579                break;
580	default:
581                printf(", length %u", length);
582                if (vflag <= 1)
583                    print_unknown_data(bp,"\n\t", length);
584                return;
585        }
586        if (!vflag)
587            printf(", length %u", length);
588	return;
589trunc:
590	fputs("[|icmp6]", stdout);
591}
592
593static struct udphdr *
594get_upperlayer(u_char *bp, u_int *prot)
595{
596	const u_char *ep;
597	struct ip6_hdr *ip6 = (struct ip6_hdr *)bp;
598	struct udphdr *uh;
599	struct ip6_hbh *hbh;
600	struct ip6_frag *fragh;
601	struct ah *ah;
602	u_int nh;
603	int hlen;
604
605	/* 'ep' points to the end of available data. */
606	ep = snapend;
607
608	if (!TTEST(ip6->ip6_nxt))
609		return NULL;
610
611	nh = ip6->ip6_nxt;
612	hlen = sizeof(struct ip6_hdr);
613
614	while (bp < ep) {
615		bp += hlen;
616
617		switch(nh) {
618		case IPPROTO_UDP:
619		case IPPROTO_TCP:
620			uh = (struct udphdr *)bp;
621			if (TTEST(uh->uh_dport)) {
622				*prot = nh;
623				return(uh);
624			}
625			else
626				return(NULL);
627			/* NOTREACHED */
628
629		case IPPROTO_HOPOPTS:
630		case IPPROTO_DSTOPTS:
631		case IPPROTO_ROUTING:
632			hbh = (struct ip6_hbh *)bp;
633			if (!TTEST(hbh->ip6h_len))
634				return(NULL);
635			nh = hbh->ip6h_nxt;
636			hlen = (hbh->ip6h_len + 1) << 3;
637			break;
638
639		case IPPROTO_FRAGMENT: /* this should be odd, but try anyway */
640			fragh = (struct ip6_frag *)bp;
641			if (!TTEST(fragh->ip6f_offlg))
642				return(NULL);
643			/* fragments with non-zero offset are meaningless */
644			if ((EXTRACT_16BITS(&fragh->ip6f_offlg) & IP6F_OFF_MASK) != 0)
645				return(NULL);
646			nh = fragh->ip6f_nxt;
647			hlen = sizeof(struct ip6_frag);
648			break;
649
650		case IPPROTO_AH:
651			ah = (struct ah *)bp;
652			if (!TTEST(ah->ah_len))
653				return(NULL);
654			nh = ah->ah_nxt;
655			hlen = (ah->ah_len + 2) << 2;
656			break;
657
658		default:	/* unknown or undecodable header */
659			*prot = nh; /* meaningless, but set here anyway */
660			return(NULL);
661		}
662	}
663
664	return(NULL);		/* should be notreached, though */
665}
666
667static void
668icmp6_opt_print(const u_char *bp, int resid)
669{
670	const struct nd_opt_hdr *op;
671	const struct nd_opt_hdr *opl;	/* why there's no struct? */
672	const struct nd_opt_prefix_info *opp;
673	const struct icmp6_opts_redirect *opr;
674	const struct nd_opt_mtu *opm;
675	const struct nd_opt_rdnss *oprd;
676	const struct nd_opt_advinterval *opa;
677	const struct nd_opt_homeagent_info *oph;
678	const struct nd_opt_route_info *opri;
679	const u_char *cp, *ep;
680	struct in6_addr in6, *in6p;
681	size_t l;
682	u_int i;
683
684#define ECHECK(var) if ((u_char *)&(var) > ep - sizeof(var)) return
685
686	cp = bp;
687	/* 'ep' points to the end of available data. */
688	ep = snapend;
689
690	while (cp < ep) {
691		op = (struct nd_opt_hdr *)cp;
692
693		ECHECK(op->nd_opt_len);
694		if (resid <= 0)
695			return;
696		if (op->nd_opt_len == 0)
697			goto trunc;
698		if (cp + (op->nd_opt_len << 3) > ep)
699			goto trunc;
700
701                printf("\n\t  %s option (%u), length %u (%u): ",
702                       tok2str(icmp6_opt_values, "unknown", op->nd_opt_type),
703                       op->nd_opt_type,
704                       op->nd_opt_len << 3,
705                       op->nd_opt_len);
706
707		switch (op->nd_opt_type) {
708		case ND_OPT_SOURCE_LINKADDR:
709			opl = (struct nd_opt_hdr *)op;
710			l = (op->nd_opt_len << 3) - 2;
711			print_lladdr(cp + 2, l);
712			break;
713		case ND_OPT_TARGET_LINKADDR:
714			opl = (struct nd_opt_hdr *)op;
715			l = (op->nd_opt_len << 3) - 2;
716			print_lladdr(cp + 2, l);
717			break;
718		case ND_OPT_PREFIX_INFORMATION:
719			opp = (struct nd_opt_prefix_info *)op;
720			TCHECK(opp->nd_opt_pi_prefix);
721                        printf("%s/%u%s, Flags [%s], valid time %ss",
722                               ip6addr_string(&opp->nd_opt_pi_prefix),
723                               opp->nd_opt_pi_prefix_len,
724                               (op->nd_opt_len != 4) ? "badlen" : "",
725                               bittok2str(icmp6_opt_pi_flag_values, "none", opp->nd_opt_pi_flags_reserved),
726                               get_lifetime(EXTRACT_32BITS(&opp->nd_opt_pi_valid_time)));
727                        printf(", pref. time %ss", get_lifetime(EXTRACT_32BITS(&opp->nd_opt_pi_preferred_time)));
728			break;
729		case ND_OPT_REDIRECTED_HEADER:
730			opr = (struct icmp6_opts_redirect *)op;
731                        print_unknown_data(bp,"\n\t    ",op->nd_opt_len<<3);
732			/* xxx */
733			break;
734		case ND_OPT_MTU:
735			opm = (struct nd_opt_mtu *)op;
736			TCHECK(opm->nd_opt_mtu_mtu);
737			printf(" %u%s",
738                               EXTRACT_32BITS(&opm->nd_opt_mtu_mtu),
739                               (op->nd_opt_len != 1) ? "bad option length" : "" );
740                        break;
741		case ND_OPT_RDNSS:
742			oprd = (struct nd_opt_rdnss *)op;
743			l = (op->nd_opt_len - 1) / 2;
744			printf(" lifetime %us,",
745				EXTRACT_32BITS(&oprd->nd_opt_rdnss_lifetime));
746			for (i = 0; i < l; i++) {
747				TCHECK(oprd->nd_opt_rdnss_addr[i]);
748				printf(" addr: %s",
749				    ip6addr_string(&oprd->nd_opt_rdnss_addr[i]));
750			}
751			break;
752		case ND_OPT_ADVINTERVAL:
753			opa = (struct nd_opt_advinterval *)op;
754			TCHECK(opa->nd_opt_adv_interval);
755			printf(" %us", EXTRACT_32BITS(&opa->nd_opt_adv_interval));
756			break;
757		case ND_OPT_HOMEAGENT_INFO:
758			oph = (struct nd_opt_homeagent_info *)op;
759			TCHECK(oph->nd_opt_hai_lifetime);
760			printf(" preference %u, lifetime %u",
761                               EXTRACT_16BITS(&oph->nd_opt_hai_preference),
762                               EXTRACT_16BITS(&oph->nd_opt_hai_lifetime));
763			break;
764		case ND_OPT_ROUTE_INFO:
765			opri = (struct nd_opt_route_info *)op;
766			TCHECK(opri->nd_opt_rti_lifetime);
767			memset(&in6, 0, sizeof(in6));
768			in6p = (struct in6_addr *)(opri + 1);
769			switch (op->nd_opt_len) {
770			case 1:
771				break;
772			case 2:
773				TCHECK2(*in6p, 8);
774				memcpy(&in6, opri + 1, 8);
775				break;
776			case 3:
777				TCHECK(*in6p);
778				memcpy(&in6, opri + 1, sizeof(in6));
779				break;
780			default:
781				goto trunc;
782			}
783			printf(" %s/%u", ip6addr_string(&in6),
784			    opri->nd_opt_rti_prefixlen);
785			printf(", pref=%s", get_rtpref(opri->nd_opt_rti_flags));
786			printf(", lifetime=%s",
787			    get_lifetime(EXTRACT_32BITS(&opri->nd_opt_rti_lifetime)));
788			break;
789		default:
790                        if (vflag <= 1) {
791                            print_unknown_data(cp+2,"\n\t  ", (op->nd_opt_len << 3) - 2); /* skip option header */
792                            return;
793                        }
794                        break;
795		}
796                /* do we want to see an additional hexdump ? */
797                if (vflag> 1)
798                    print_unknown_data(cp+2,"\n\t    ", (op->nd_opt_len << 3) - 2); /* skip option header */
799
800		cp += op->nd_opt_len << 3;
801		resid -= op->nd_opt_len << 3;
802	}
803	return;
804
805 trunc:
806	fputs("[ndp opt]", stdout);
807	return;
808#undef ECHECK
809}
810
811static void
812mld6_print(const u_char *bp)
813{
814	struct mld6_hdr *mp = (struct mld6_hdr *)bp;
815	const u_char *ep;
816
817	/* 'ep' points to the end of available data. */
818	ep = snapend;
819
820	if ((u_char *)mp + sizeof(*mp) > ep)
821		return;
822
823	printf("max resp delay: %d ", EXTRACT_16BITS(&mp->mld6_maxdelay));
824	printf("addr: %s", ip6addr_string(&mp->mld6_addr));
825}
826
827static void
828mldv2_report_print(const u_char *bp, u_int len)
829{
830    struct icmp6_hdr *icp = (struct icmp6_hdr *) bp;
831    u_int group, nsrcs, ngroups;
832    u_int i, j;
833
834    /* Minimum len is 8 */
835    if (len < 8) {
836	printf(" [invalid len %d]", len);
837	return;
838    }
839
840    TCHECK(icp->icmp6_data16[1]);
841    ngroups = EXTRACT_16BITS(&icp->icmp6_data16[1]);
842    printf(", %d group record(s)", ngroups);
843    if (vflag > 0) {
844	/* Print the group records */
845	group = 8;
846        for (i = 0; i < ngroups; i++) {
847	    /* type(1) + auxlen(1) + numsrc(2) + grp(16) */
848	    if (len < group + 20) {
849		printf(" [invalid number of groups]");
850		return;
851	    }
852            TCHECK2(bp[group + 4], sizeof(struct in6_addr));
853            printf(" [gaddr %s", ip6addr_string(&bp[group + 4]));
854	    printf(" %s", tok2str(mldv2report2str, " [v2-report-#%d]",
855								bp[group]));
856            nsrcs = (bp[group + 2] << 8) + bp[group + 3];
857	    /* Check the number of sources and print them */
858	    if (len < group + 20 + (nsrcs * sizeof(struct in6_addr))) {
859		printf(" [invalid number of sources %d]", nsrcs);
860		return;
861	    }
862            if (vflag == 1)
863                printf(", %d source(s)", nsrcs);
864            else {
865		/* Print the sources */
866                (void)printf(" {");
867                for (j = 0; j < nsrcs; j++) {
868                    TCHECK2(bp[group + 20 + j * sizeof(struct in6_addr)],
869                            sizeof(struct in6_addr));
870		    printf(" %s", ip6addr_string(&bp[group + 20 + j * sizeof(struct in6_addr)]));
871		}
872                (void)printf(" }");
873            }
874	    /* Next group record */
875            group += 20 + nsrcs * sizeof(struct in6_addr);
876	    printf("]");
877        }
878    }
879    return;
880trunc:
881    (void)printf("[|icmp6]");
882    return;
883}
884
885static void
886mldv2_query_print(const u_char *bp, u_int len)
887{
888    struct icmp6_hdr *icp = (struct icmp6_hdr *) bp;
889    u_int mrc;
890    int mrt, qqi;
891    u_int nsrcs;
892    register u_int i;
893
894    /* Minimum len is 28 */
895    if (len < 28) {
896	printf(" [invalid len %d]", len);
897	return;
898    }
899    TCHECK(icp->icmp6_data16[0]);
900    mrc = EXTRACT_16BITS(&icp->icmp6_data16[0]);
901    if (mrc < 32768) {
902	mrt = mrc;
903    } else {
904        mrt = ((mrc & 0x0fff) | 0x1000) << (((mrc & 0x7000) >> 12) + 3);
905    }
906    if (vflag) {
907	(void)printf(" [max resp delay=%d]", mrt);
908    }
909    TCHECK2(bp[8], sizeof(struct in6_addr));
910    printf(" [gaddr %s", ip6addr_string(&bp[8]));
911
912    if (vflag) {
913        TCHECK(bp[25]);
914	if (bp[24] & 0x08) {
915		printf(" sflag");
916	}
917	if (bp[24] & 0x07) {
918		printf(" robustness=%d", bp[24] & 0x07);
919	}
920	if (bp[25] < 128) {
921		qqi = bp[25];
922	} else {
923		qqi = ((bp[25] & 0x0f) | 0x10) << (((bp[25] & 0x70) >> 4) + 3);
924	}
925	printf(" qqi=%d", qqi);
926    }
927
928    TCHECK2(bp[26], 2);
929    nsrcs = EXTRACT_16BITS(&bp[26]);
930    if (nsrcs > 0) {
931	if (len < 28 + nsrcs * sizeof(struct in6_addr))
932	    printf(" [invalid number of sources]");
933	else if (vflag > 1) {
934	    printf(" {");
935	    for (i = 0; i < nsrcs; i++) {
936		TCHECK2(bp[28 + i * sizeof(struct in6_addr)],
937                        sizeof(struct in6_addr));
938		printf(" %s", ip6addr_string(&bp[28 + i * sizeof(struct in6_addr)]));
939	    }
940	    printf(" }");
941	} else
942	    printf(", %d source(s)", nsrcs);
943    }
944    printf("]");
945    return;
946trunc:
947    (void)printf("[|icmp6]");
948    return;
949}
950
951static void
952dnsname_print(const u_char *cp, const u_char *ep)
953{
954	int i;
955
956	/* DNS name decoding - no decompression */
957	printf(", \"");
958	while (cp < ep) {
959		i = *cp++;
960		if (i) {
961			if (i > ep - cp) {
962				printf("???");
963				break;
964			}
965			while (i-- && cp < ep) {
966				safeputchar(*cp);
967				cp++;
968			}
969			if (cp + 1 < ep && *cp)
970				printf(".");
971		} else {
972			if (cp == ep) {
973				/* FQDN */
974				printf(".");
975			} else if (cp + 1 == ep && *cp == '\0') {
976				/* truncated */
977			} else {
978				/* invalid */
979				printf("???");
980			}
981			break;
982		}
983	}
984	printf("\"");
985}
986
987static void
988icmp6_nodeinfo_print(u_int icmp6len, const u_char *bp, const u_char *ep)
989{
990	struct icmp6_nodeinfo *ni6;
991	struct icmp6_hdr *dp;
992	const u_char *cp;
993	size_t siz, i;
994	int needcomma;
995
996	if (ep < bp)
997		return;
998	dp = (struct icmp6_hdr *)bp;
999	ni6 = (struct icmp6_nodeinfo *)bp;
1000	siz = ep - bp;
1001
1002	switch (ni6->ni_type) {
1003	case ICMP6_NI_QUERY:
1004		if (siz == sizeof(*dp) + 4) {
1005			/* KAME who-are-you */
1006			printf(" who-are-you request");
1007			break;
1008		}
1009		printf(" node information query");
1010
1011		TCHECK2(*dp, sizeof(*ni6));
1012		ni6 = (struct icmp6_nodeinfo *)dp;
1013		printf(" (");	/*)*/
1014		switch (EXTRACT_16BITS(&ni6->ni_qtype)) {
1015		case NI_QTYPE_NOOP:
1016			printf("noop");
1017			break;
1018		case NI_QTYPE_SUPTYPES:
1019			printf("supported qtypes");
1020			i = EXTRACT_16BITS(&ni6->ni_flags);
1021			if (i)
1022				printf(" [%s]", (i & 0x01) ? "C" : "");
1023			break;
1024			break;
1025		case NI_QTYPE_FQDN:
1026			printf("DNS name");
1027			break;
1028		case NI_QTYPE_NODEADDR:
1029			printf("node addresses");
1030			i = ni6->ni_flags;
1031			if (!i)
1032				break;
1033			/* NI_NODEADDR_FLAG_TRUNCATE undefined for query */
1034			printf(" [%s%s%s%s%s%s]",
1035			    (i & NI_NODEADDR_FLAG_ANYCAST) ? "a" : "",
1036			    (i & NI_NODEADDR_FLAG_GLOBAL) ? "G" : "",
1037			    (i & NI_NODEADDR_FLAG_SITELOCAL) ? "S" : "",
1038			    (i & NI_NODEADDR_FLAG_LINKLOCAL) ? "L" : "",
1039			    (i & NI_NODEADDR_FLAG_COMPAT) ? "C" : "",
1040			    (i & NI_NODEADDR_FLAG_ALL) ? "A" : "");
1041			break;
1042		default:
1043			printf("unknown");
1044			break;
1045		}
1046
1047		if (ni6->ni_qtype == NI_QTYPE_NOOP ||
1048		    ni6->ni_qtype == NI_QTYPE_SUPTYPES) {
1049			if (siz != sizeof(*ni6))
1050				if (vflag)
1051					printf(", invalid len");
1052			/*(*/
1053			printf(")");
1054			break;
1055		}
1056
1057
1058		/* XXX backward compat, icmp-name-lookup-03 */
1059		if (siz == sizeof(*ni6)) {
1060			printf(", 03 draft");
1061			/*(*/
1062			printf(")");
1063			break;
1064		}
1065
1066		switch (ni6->ni_code) {
1067		case ICMP6_NI_SUBJ_IPV6:
1068			if (!TTEST2(*dp,
1069			    sizeof(*ni6) + sizeof(struct in6_addr)))
1070				break;
1071			if (siz != sizeof(*ni6) + sizeof(struct in6_addr)) {
1072				if (vflag)
1073					printf(", invalid subject len");
1074				break;
1075			}
1076			printf(", subject=%s",
1077			    getname6((const u_char *)(ni6 + 1)));
1078			break;
1079		case ICMP6_NI_SUBJ_FQDN:
1080			printf(", subject=DNS name");
1081			cp = (const u_char *)(ni6 + 1);
1082			if (cp[0] == ep - cp - 1) {
1083				/* icmp-name-lookup-03, pascal string */
1084				if (vflag)
1085					printf(", 03 draft");
1086				cp++;
1087				printf(", \"");
1088				while (cp < ep) {
1089					safeputchar(*cp);
1090					cp++;
1091				}
1092				printf("\"");
1093			} else
1094				dnsname_print(cp, ep);
1095			break;
1096		case ICMP6_NI_SUBJ_IPV4:
1097			if (!TTEST2(*dp, sizeof(*ni6) + sizeof(struct in_addr)))
1098				break;
1099			if (siz != sizeof(*ni6) + sizeof(struct in_addr)) {
1100				if (vflag)
1101					printf(", invalid subject len");
1102				break;
1103			}
1104			printf(", subject=%s",
1105			    getname((const u_char *)(ni6 + 1)));
1106			break;
1107		default:
1108			printf(", unknown subject");
1109			break;
1110		}
1111
1112		/*(*/
1113		printf(")");
1114		break;
1115
1116	case ICMP6_NI_REPLY:
1117		if (icmp6len > siz) {
1118			printf("[|icmp6: node information reply]");
1119			break;
1120		}
1121
1122		needcomma = 0;
1123
1124		ni6 = (struct icmp6_nodeinfo *)dp;
1125		printf(" node information reply");
1126		printf(" (");	/*)*/
1127		switch (ni6->ni_code) {
1128		case ICMP6_NI_SUCCESS:
1129			if (vflag) {
1130				printf("success");
1131				needcomma++;
1132			}
1133			break;
1134		case ICMP6_NI_REFUSED:
1135			printf("refused");
1136			needcomma++;
1137			if (siz != sizeof(*ni6))
1138				if (vflag)
1139					printf(", invalid length");
1140			break;
1141		case ICMP6_NI_UNKNOWN:
1142			printf("unknown");
1143			needcomma++;
1144			if (siz != sizeof(*ni6))
1145				if (vflag)
1146					printf(", invalid length");
1147			break;
1148		}
1149
1150		if (ni6->ni_code != ICMP6_NI_SUCCESS) {
1151			/*(*/
1152			printf(")");
1153			break;
1154		}
1155
1156		switch (EXTRACT_16BITS(&ni6->ni_qtype)) {
1157		case NI_QTYPE_NOOP:
1158			if (needcomma)
1159				printf(", ");
1160			printf("noop");
1161			if (siz != sizeof(*ni6))
1162				if (vflag)
1163					printf(", invalid length");
1164			break;
1165		case NI_QTYPE_SUPTYPES:
1166			if (needcomma)
1167				printf(", ");
1168			printf("supported qtypes");
1169			i = EXTRACT_16BITS(&ni6->ni_flags);
1170			if (i)
1171				printf(" [%s]", (i & 0x01) ? "C" : "");
1172			break;
1173		case NI_QTYPE_FQDN:
1174			if (needcomma)
1175				printf(", ");
1176			printf("DNS name");
1177			cp = (const u_char *)(ni6 + 1) + 4;
1178			if (cp[0] == ep - cp - 1) {
1179				/* icmp-name-lookup-03, pascal string */
1180				if (vflag)
1181					printf(", 03 draft");
1182				cp++;
1183				printf(", \"");
1184				while (cp < ep) {
1185					safeputchar(*cp);
1186					cp++;
1187				}
1188				printf("\"");
1189			} else
1190				dnsname_print(cp, ep);
1191			if ((EXTRACT_16BITS(&ni6->ni_flags) & 0x01) != 0)
1192				printf(" [TTL=%u]", *(u_int32_t *)(ni6 + 1));
1193			break;
1194		case NI_QTYPE_NODEADDR:
1195			if (needcomma)
1196				printf(", ");
1197			printf("node addresses");
1198			i = sizeof(*ni6);
1199			while (i < siz) {
1200				if (i + sizeof(struct in6_addr) + sizeof(int32_t) > siz)
1201					break;
1202				printf(" %s", getname6(bp + i));
1203				i += sizeof(struct in6_addr);
1204				printf("(%d)", (int32_t)EXTRACT_32BITS(bp + i));
1205				i += sizeof(int32_t);
1206			}
1207			i = ni6->ni_flags;
1208			if (!i)
1209				break;
1210			printf(" [%s%s%s%s%s%s%s]",
1211			    (i & NI_NODEADDR_FLAG_ANYCAST) ? "a" : "",
1212			    (i & NI_NODEADDR_FLAG_GLOBAL) ? "G" : "",
1213			    (i & NI_NODEADDR_FLAG_SITELOCAL) ? "S" : "",
1214			    (i & NI_NODEADDR_FLAG_LINKLOCAL) ? "L" : "",
1215			    (i & NI_NODEADDR_FLAG_COMPAT) ? "C" : "",
1216			    (i & NI_NODEADDR_FLAG_ALL) ? "A" : "",
1217			    (i & NI_NODEADDR_FLAG_TRUNCATE) ? "T" : "");
1218			break;
1219		default:
1220			if (needcomma)
1221				printf(", ");
1222			printf("unknown");
1223			break;
1224		}
1225
1226		/*(*/
1227		printf(")");
1228		break;
1229	}
1230	return;
1231
1232trunc:
1233	fputs("[|icmp6]", stdout);
1234}
1235
1236static void
1237icmp6_rrenum_print(const u_char *bp, const u_char *ep)
1238{
1239	struct icmp6_router_renum *rr6;
1240	const char *cp;
1241	struct rr_pco_match *match;
1242	struct rr_pco_use *use;
1243	char hbuf[NI_MAXHOST];
1244	int n;
1245
1246	if (ep < bp)
1247		return;
1248	rr6 = (struct icmp6_router_renum *)bp;
1249	cp = (const char *)(rr6 + 1);
1250
1251	TCHECK(rr6->rr_reserved);
1252	switch (rr6->rr_code) {
1253	case ICMP6_ROUTER_RENUMBERING_COMMAND:
1254		printf("router renum: command");
1255		break;
1256	case ICMP6_ROUTER_RENUMBERING_RESULT:
1257		printf("router renum: result");
1258		break;
1259	case ICMP6_ROUTER_RENUMBERING_SEQNUM_RESET:
1260		printf("router renum: sequence number reset");
1261		break;
1262	default:
1263		printf("router renum: code-#%d", rr6->rr_code);
1264		break;
1265	}
1266
1267	printf(", seq=%u", EXTRACT_32BITS(&rr6->rr_seqnum));
1268
1269	if (vflag) {
1270#define F(x, y)	((rr6->rr_flags) & (x) ? (y) : "")
1271		printf("[");	/*]*/
1272		if (rr6->rr_flags) {
1273			printf("%s%s%s%s%s,", F(ICMP6_RR_FLAGS_TEST, "T"),
1274			    F(ICMP6_RR_FLAGS_REQRESULT, "R"),
1275			    F(ICMP6_RR_FLAGS_FORCEAPPLY, "A"),
1276			    F(ICMP6_RR_FLAGS_SPECSITE, "S"),
1277			    F(ICMP6_RR_FLAGS_PREVDONE, "P"));
1278		}
1279		printf("seg=%u,", rr6->rr_segnum);
1280		printf("maxdelay=%u", EXTRACT_16BITS(&rr6->rr_maxdelay));
1281		if (rr6->rr_reserved)
1282			printf("rsvd=0x%x", EXTRACT_32BITS(&rr6->rr_reserved));
1283		/*[*/
1284		printf("]");
1285#undef F
1286	}
1287
1288	if (rr6->rr_code == ICMP6_ROUTER_RENUMBERING_COMMAND) {
1289		match = (struct rr_pco_match *)cp;
1290		cp = (const char *)(match + 1);
1291
1292		TCHECK(match->rpm_prefix);
1293
1294		if (vflag > 1)
1295			printf("\n\t");
1296		else
1297			printf(" ");
1298		printf("match(");	/*)*/
1299		switch (match->rpm_code) {
1300		case RPM_PCO_ADD:	printf("add"); break;
1301		case RPM_PCO_CHANGE:	printf("change"); break;
1302		case RPM_PCO_SETGLOBAL:	printf("setglobal"); break;
1303		default:		printf("#%u", match->rpm_code); break;
1304		}
1305
1306		if (vflag) {
1307			printf(",ord=%u", match->rpm_ordinal);
1308			printf(",min=%u", match->rpm_minlen);
1309			printf(",max=%u", match->rpm_maxlen);
1310		}
1311		if (inet_ntop(AF_INET6, &match->rpm_prefix, hbuf, sizeof(hbuf)))
1312			printf(",%s/%u", hbuf, match->rpm_matchlen);
1313		else
1314			printf(",?/%u", match->rpm_matchlen);
1315		/*(*/
1316		printf(")");
1317
1318		n = match->rpm_len - 3;
1319		if (n % 4)
1320			goto trunc;
1321		n /= 4;
1322		while (n-- > 0) {
1323			use = (struct rr_pco_use *)cp;
1324			cp = (const char *)(use + 1);
1325
1326			TCHECK(use->rpu_prefix);
1327
1328			if (vflag > 1)
1329				printf("\n\t");
1330			else
1331				printf(" ");
1332			printf("use(");	/*)*/
1333			if (use->rpu_flags) {
1334#define F(x, y)	((use->rpu_flags) & (x) ? (y) : "")
1335				printf("%s%s,",
1336				    F(ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME, "V"),
1337				    F(ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME, "P"));
1338#undef F
1339			}
1340			if (vflag) {
1341				printf("mask=0x%x,", use->rpu_ramask);
1342				printf("raflags=0x%x,", use->rpu_raflags);
1343				if (~use->rpu_vltime == 0)
1344					printf("vltime=infty,");
1345				else
1346					printf("vltime=%u,",
1347					    EXTRACT_32BITS(&use->rpu_vltime));
1348				if (~use->rpu_pltime == 0)
1349					printf("pltime=infty,");
1350				else
1351					printf("pltime=%u,",
1352					    EXTRACT_32BITS(&use->rpu_pltime));
1353			}
1354			if (inet_ntop(AF_INET6, &use->rpu_prefix, hbuf,
1355			    sizeof(hbuf)))
1356				printf("%s/%u/%u", hbuf, use->rpu_uselen,
1357				    use->rpu_keeplen);
1358			else
1359				printf("?/%u/%u", use->rpu_uselen,
1360				    use->rpu_keeplen);
1361			/*(*/
1362			printf(")");
1363		}
1364	}
1365
1366	return;
1367
1368trunc:
1369	fputs("[|icmp6]", stdout);
1370}
1371
1372#endif /* INET6 */
1373