ifmcstat.c revision 168560 
1/*	$KAME: ifmcstat.c,v 1.48 2006/11/15 05:13:59 itojun Exp $	*/
2
3/*
4 * Copyright (c) 2007 Bruce M. Simpson <bms@FreeBSD.org>
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: head/usr.sbin/ifmcstat/ifmcstat.c 168560 2007-04-10 00:26:12Z bms $");
35
36#include <sys/types.h>
37#include <sys/param.h>
38#include <sys/socket.h>
39#include <sys/queue.h>
40
41#include <net/if.h>
42#include <net/if_var.h>
43#include <net/if_types.h>
44#include <net/if_dl.h>
45#include <net/route.h>
46
47#include <netinet/in.h>
48#include <netinet/in_var.h>
49#include <netinet/in_systm.h>
50#include <netinet/ip.h>
51#include <netinet/igmp.h>
52#ifdef HAVE_IGMPV3
53# include <netinet/in_msf.h>
54#endif
55#define KERNEL
56# include <netinet/if_ether.h>
57#undef KERNEL
58#define _KERNEL
59# include <sys/sysctl.h>
60# include <netinet/igmp_var.h>
61#undef _KERNEL
62
63#ifdef INET6
64# ifdef HAVE_MLDV2
65#  include <netinet6/in6_msf.h>
66# endif
67#include <netinet/icmp6.h>
68#define _KERNEL
69# include <netinet6/mld6_var.h>
70#undef _KERNEL
71#endif /* INET6 */
72
73#include <arpa/inet.h>
74#include <netdb.h>
75
76#include <stddef.h>
77#include <stdarg.h>
78#include <stdlib.h>
79#include <stdint.h>
80#include <stdio.h>
81#include <stdlib.h>
82#include <string.h>
83
84#include <ctype.h>
85#include <err.h>
86#include <fcntl.h>
87#include <kvm.h>
88#include <limits.h>
89#include <ifaddrs.h>
90#include <nlist.h>
91#include <sysexits.h>
92#include <unistd.h>
93
94/* XXX: This file currently assumes INET and KVM support in the base system. */
95#ifndef INET
96#define INET
97#endif
98
99union sockunion {
100	struct sockaddr_storage	ss;
101	struct sockaddr		sa;
102	struct sockaddr_dl	sdl;
103#ifdef INET
104	struct sockaddr_in	sin;
105#endif
106#ifdef INET6
107	struct sockaddr_in6	sin6;
108#endif
109};
110typedef union sockunion sockunion_t;
111
112uint32_t	ifindex = 0;
113int		af = AF_UNSPEC;
114
115#define	sa_equal(a1, a2)	\
116	(bcmp((a1), (a2), ((a1))->sa_len) == 0)
117
118#define	sa_dl_equal(a1, a2)	\
119	((((struct sockaddr_dl *)(a1))->sdl_len ==			\
120	 ((struct sockaddr_dl *)(a2))->sdl_len) &&			\
121	 (bcmp(LLADDR((struct sockaddr_dl *)(a1)),			\
122	       LLADDR((struct sockaddr_dl *)(a2)),			\
123	       ((struct sockaddr_dl *)(a1))->sdl_alen) == 0))
124
125/*
126 * Most of the code in this utility is to support the use of KVM for
127 * post-mortem debugging of the multicast code.
128 */
129#ifdef WITH_KVM
130
131#ifdef INET
132static void		if_addrlist(struct ifaddr *);
133static struct in_multi *
134			in_multientry(struct in_multi *);
135#ifdef HAVE_IGMPV3
136static void		in_addr_slistentry(struct in_addr_slist *, char *);
137#endif
138#endif /* INET */
139
140#ifdef INET6
141static void		if6_addrlist(struct ifaddr *);
142static struct in6_multi *
143			in6_multientry(struct in6_multi *);
144#ifdef HAVE_MLDV2
145static void		in6_addr_slistentry(struct in6_addr_slist *, char *);
146#endif
147static const char *	inet6_n2a(struct in6_addr *);
148#endif /* INET6 */
149
150static void		kread(u_long, void *, int);
151static int		ifmcstat_kvm(const char *kernel, const char *core);
152
153#define	KREAD(addr, buf, type) \
154	kread((u_long)addr, (void *)buf, sizeof(type))
155
156kvm_t	*kvmd;
157struct	nlist nl[] = {
158	{ "_ifnet", 0, 0, 0, 0, },
159	{ "", 0, 0, 0, 0, },
160};
161#define	N_IFNET	0
162
163#endif /* WITH_KVM */
164
165static int		ifmcstat_getifmaddrs(void);
166int			main(int, char **);
167
168int
169main(int argc, char **argv)
170{
171	int c, error;
172#ifdef WITH_KVM
173	const char *kernel = NULL;
174	const char *core = NULL;
175
176	/* "ifmcstat [kernel]" format is supported for backward compatiblity */
177	if (argc == 2)
178		kernel = argv[1];
179#endif
180
181	while ((c = getopt(argc, argv, "i:f:M:N:")) != -1) {
182		switch (c) {
183		case 'i':
184			if ((ifindex = if_nametoindex(optarg)) == 0) {
185				fprintf(stderr, "%s: unknown interface\n",
186				    optarg);
187				exit(1);
188			}
189			break;
190
191		case 'f':
192#ifdef INET
193			if (strcmp(optarg, "inet") == 0) {
194				af = AF_INET;
195				break;
196			}
197#endif
198#ifdef INET6
199			if (strcmp(optarg, "inet6") == 0) {
200				af = AF_INET6;
201				break;
202			}
203#endif
204			fprintf(stderr, "%s: unknown address family\n", optarg);
205			exit(1);
206			/*NOTREACHED*/
207			break;
208
209#ifdef WITH_KVM
210		case 'M':
211			core = strdup(optarg);
212			break;
213
214		case 'N':
215			kernel = strdup(optarg);
216			break;
217#endif
218
219		default:
220			fprintf(stderr,
221			    "usage: ifmcstat [-i interface] [-f address family]"
222#ifdef WITH_KVM
223			    " [-M core] [-N system]"
224#endif
225			    "\n");
226			exit(1);
227			break;
228			/*NOTREACHED*/
229		}
230	}
231
232#ifdef WITH_KVM
233	error = ifmcstat_kvm(kernel, core);
234	/*
235	 * If KVM failed, and user did not explicitly specify a core file,
236	 * try the sysctl backend.
237	 */
238	if (error != 0 && (core == NULL && kernel == NULL))
239#endif
240	error = ifmcstat_getifmaddrs();
241	if (error != 0)
242		exit(1);
243
244	exit(0);
245	/*NOTREACHED*/
246}
247
248#ifdef WITH_KVM
249
250static int
251ifmcstat_kvm(const char *kernel, const char *core)
252{
253	char	buf[_POSIX2_LINE_MAX], ifname[IFNAMSIZ];
254	struct	ifnet	*ifp, *nifp, ifnet;
255
256	if ((kvmd = kvm_openfiles(kernel, core, NULL, O_RDONLY, buf)) ==
257	    NULL) {
258		perror("kvm_openfiles");
259		return (-1);
260	}
261	if (kvm_nlist(kvmd, nl) < 0) {
262		perror("kvm_nlist");
263		return (-1);
264	}
265	if (nl[N_IFNET].n_value == 0) {
266		printf("symbol %s not found\n", nl[N_IFNET].n_name);
267		return (-1);
268	}
269	KREAD(nl[N_IFNET].n_value, &ifp, struct ifnet *);
270	while (ifp) {
271		KREAD(ifp, &ifnet, struct ifnet);
272		nifp = ifnet.if_link.tqe_next;
273		if (ifindex && ifindex != ifnet.if_index)
274			goto next;
275
276		printf("%s:\n", if_indextoname(ifnet.if_index, ifname));
277#ifdef INET
278		if_addrlist(TAILQ_FIRST(&ifnet.if_addrhead));
279#endif
280#ifdef INET6
281		if6_addrlist(TAILQ_FIRST(&ifnet.if_addrhead));
282#endif
283next:
284		ifp = nifp;
285	}
286
287	return (0);
288}
289
290static void
291kread(u_long addr, void *buf, int len)
292{
293
294	if (kvm_read(kvmd, addr, buf, len) != len) {
295		perror("kvm_read");
296		exit(1);
297	}
298}
299
300#ifdef INET6
301
302static const char *
303inet6_n2a(struct in6_addr *p)
304{
305	static char buf[NI_MAXHOST];
306	struct sockaddr_in6 sin6;
307	u_int32_t scopeid;
308	const int niflags = NI_NUMERICHOST;
309
310	memset(&sin6, 0, sizeof(sin6));
311	sin6.sin6_family = AF_INET6;
312	sin6.sin6_len = sizeof(struct sockaddr_in6);
313	sin6.sin6_addr = *p;
314	if (IN6_IS_ADDR_LINKLOCAL(p) || IN6_IS_ADDR_MC_LINKLOCAL(p) ||
315	    IN6_IS_ADDR_MC_NODELOCAL(p)) {
316		scopeid = ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]);
317		if (scopeid) {
318			sin6.sin6_scope_id = scopeid;
319			sin6.sin6_addr.s6_addr[2] = 0;
320			sin6.sin6_addr.s6_addr[3] = 0;
321		}
322	}
323	if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
324			buf, sizeof(buf), NULL, 0, niflags) == 0)
325		return buf;
326	else
327		return "(invalid)";
328}
329
330static void
331if6_addrlist(struct ifaddr *ifap)
332{
333	struct ifaddr ifa;
334	struct sockaddr sa;
335	struct in6_ifaddr if6a;
336	struct ifaddr *ifap0;
337
338	if (af && af != AF_INET6)
339		return;
340	ifap0 = ifap;
341	while (ifap) {
342		KREAD(ifap, &ifa, struct ifaddr);
343		if (ifa.ifa_addr == NULL)
344			goto nextifap;
345		KREAD(ifa.ifa_addr, &sa, struct sockaddr);
346		if (sa.sa_family != PF_INET6)
347			goto nextifap;
348		KREAD(ifap, &if6a, struct in6_ifaddr);
349		printf("\tinet6 %s\n", inet6_n2a(&if6a.ia_addr.sin6_addr));
350	nextifap:
351		ifap = ifa.ifa_link.tqe_next;
352	}
353	if (ifap0) {
354		struct ifnet ifnet;
355		struct ifmultiaddr ifm, *ifmp = 0;
356		struct sockaddr_dl sdl;
357
358		KREAD(ifap0, &ifa, struct ifaddr);
359		KREAD(ifa.ifa_ifp, &ifnet, struct ifnet);
360		if (TAILQ_FIRST(&ifnet.if_multiaddrs))
361			ifmp = TAILQ_FIRST(&ifnet.if_multiaddrs);
362		while (ifmp) {
363			KREAD(ifmp, &ifm, struct ifmultiaddr);
364			if (ifm.ifma_addr == NULL)
365				goto nextmulti;
366			KREAD(ifm.ifma_addr, &sa, struct sockaddr);
367			if (sa.sa_family != AF_INET6)
368				goto nextmulti;
369			(void)in6_multientry((struct in6_multi *)
370					     ifm.ifma_protospec);
371			if (ifm.ifma_lladdr == 0)
372				goto nextmulti;
373			KREAD(ifm.ifma_lladdr, &sdl, struct sockaddr_dl);
374			printf("\t\t\tmcast-macaddr %s refcnt %d\n",
375			       ether_ntoa((struct ether_addr *)LLADDR(&sdl)),
376			       ifm.ifma_refcount);
377		    nextmulti:
378			ifmp = TAILQ_NEXT(&ifm, ifma_link);
379		}
380	}
381}
382
383static struct in6_multi *
384in6_multientry(struct in6_multi *mc)
385{
386	struct in6_multi multi;
387#ifdef HAVE_MLDV2
388	struct in6_multi_source src;
389	struct router6_info rt6i;
390#endif
391
392	KREAD(mc, &multi, struct in6_multi);
393	printf("\t\tgroup %s", inet6_n2a(&multi.in6m_addr));
394	printf(" refcnt %u\n", multi.in6m_refcount);
395
396#ifdef HAVE_MLDV2
397	if (multi.in6m_rti != NULL) {
398		KREAD(multi.in6m_rti, &rt6i, struct router_info);
399		printf("\t\t\t");
400		switch (rt6i.rt6i_type) {
401		case MLD_V1_ROUTER:
402			printf("mldv1");
403			break;
404		case MLD_V2_ROUTER:
405			printf("mldv2");
406			break;
407		default:
408			printf("mldv?(%d)", rt6i.rt6i_type);
409			break;
410		}
411
412		if (multi.in6m_source == NULL) {
413			printf("\n");
414			return(multi.in6m_entry.le_next);
415		}
416
417		KREAD(multi.in6m_source, &src, struct in6_multi_source);
418		printf(" mode=%s grpjoin=%d\n",
419		    src.i6ms_mode == MCAST_INCLUDE ? "include" :
420		    src.i6ms_mode == MCAST_EXCLUDE ? "exclude" :
421		    "???",
422		    src.i6ms_grpjoin);
423		in6_addr_slistentry(src.i6ms_cur, "current");
424		in6_addr_slistentry(src.i6ms_rec, "recorded");
425		in6_addr_slistentry(src.i6ms_in, "included");
426		in6_addr_slistentry(src.i6ms_ex, "excluded");
427		in6_addr_slistentry(src.i6ms_alw, "allowed");
428		in6_addr_slistentry(src.i6ms_blk, "blocked");
429		in6_addr_slistentry(src.i6ms_toin, "to-include");
430		in6_addr_slistentry(src.i6ms_ex, "to-exclude");
431	}
432#endif
433	return(multi.in6m_entry.le_next);
434}
435
436#ifdef HAVE_MLDV2
437static void
438in6_addr_slistentry(struct in6_addr_slist *ias, char *heading)
439{
440	struct in6_addr_slist slist;
441	struct i6as_head head;
442	struct in6_addr_source src;
443
444	if (ias == NULL) {
445		printf("\t\t\t\t%s (none)\n", heading);
446		return;
447	}
448	memset(&slist, 0, sizeof(slist));
449	KREAD(ias, &slist, struct in6_addr_source);
450	printf("\t\t\t\t%s (entry num=%d)\n", heading, slist.numsrc);
451	if (slist.numsrc == 0) {
452		return;
453	}
454	KREAD(slist.head, &head, struct i6as_head);
455
456	KREAD(head.lh_first, &src, struct in6_addr_source);
457	while (1) {
458		printf("\t\t\t\t\tsource %s (ref=%d)\n",
459			inet6_n2a(&src.i6as_addr.sin6_addr),
460			src.i6as_refcount);
461		if (src.i6as_list.le_next == NULL)
462			break;
463		KREAD(src.i6as_list.le_next, &src, struct in6_addr_source);
464	}
465	return;
466}
467#endif /* HAVE_MLDV2 */
468
469#endif /* INET6 */
470
471#ifdef INET
472
473static void
474if_addrlist(struct ifaddr *ifap)
475{
476	struct ifaddr ifa;
477	struct sockaddr sa;
478	struct in_ifaddr ia;
479	struct ifaddr *ifap0;
480
481	if (af && af != AF_INET)
482		return;
483	ifap0 = ifap;
484	while (ifap) {
485		KREAD(ifap, &ifa, struct ifaddr);
486		if (ifa.ifa_addr == NULL)
487			goto nextifap;
488		KREAD(ifa.ifa_addr, &sa, struct sockaddr);
489		if (sa.sa_family != PF_INET)
490			goto nextifap;
491		KREAD(ifap, &ia, struct in_ifaddr);
492		printf("\tinet %s\n", inet_ntoa(ia.ia_addr.sin_addr));
493	nextifap:
494		ifap = ifa.ifa_link.tqe_next;
495	}
496	if (ifap0) {
497		struct ifnet ifnet;
498		struct ifmultiaddr ifm, *ifmp = 0;
499		struct sockaddr_dl sdl;
500
501		KREAD(ifap0, &ifa, struct ifaddr);
502		KREAD(ifa.ifa_ifp, &ifnet, struct ifnet);
503		if (TAILQ_FIRST(&ifnet.if_multiaddrs))
504			ifmp = TAILQ_FIRST(&ifnet.if_multiaddrs);
505		while (ifmp) {
506			KREAD(ifmp, &ifm, struct ifmultiaddr);
507			if (ifm.ifma_addr == NULL)
508				goto nextmulti;
509			KREAD(ifm.ifma_addr, &sa, struct sockaddr);
510			if (sa.sa_family != AF_INET)
511				goto nextmulti;
512			(void)in_multientry((struct in_multi *)
513					    ifm.ifma_protospec);
514			if (ifm.ifma_lladdr == 0)
515				goto nextmulti;
516			KREAD(ifm.ifma_lladdr, &sdl, struct sockaddr_dl);
517			printf("\t\t\tmcast-macaddr %s refcnt %d\n",
518			       ether_ntoa((struct ether_addr *)LLADDR(&sdl)),
519			       ifm.ifma_refcount);
520		    nextmulti:
521			ifmp = TAILQ_NEXT(&ifm, ifma_link);
522		}
523	}
524}
525
526static struct in_multi *
527in_multientry(struct in_multi *mc)
528{
529	struct in_multi multi;
530	struct router_info rti;
531#ifdef HAVE_IGMPV3
532	struct in_multi_source src;
533#endif
534
535	KREAD(mc, &multi, struct in_multi);
536	printf("\t\tgroup %s\n", inet_ntoa(multi.inm_addr));
537
538	if (multi.inm_rti != NULL) {
539		KREAD(multi.inm_rti, &rti, struct router_info);
540		printf("\t\t\t");
541		switch (rti.rti_type) {
542		case IGMP_V1_ROUTER:
543			printf("igmpv1");
544			break;
545		case IGMP_V2_ROUTER:
546			printf("igmpv2");
547			break;
548#ifdef HAVE_IGMPV3
549		case IGMP_V3_ROUTER:
550			printf("igmpv3");
551			break;
552#endif
553		default:
554			printf("igmpv?(%d)", rti.rti_type);
555			break;
556		}
557
558#ifdef HAVE_IGMPV3
559		if (multi.inm_source == NULL) {
560			printf("\n");
561			return (multi.inm_list.le_next);
562		}
563
564		KREAD(multi.inm_source, &src, struct in_multi_source);
565		printf(" mode=%s grpjoin=%d\n",
566		    src.ims_mode == MCAST_INCLUDE ? "include" :
567		    src.ims_mode == MCAST_EXCLUDE ? "exclude" :
568		    "???",
569		    src.ims_grpjoin);
570		in_addr_slistentry(src.ims_cur, "current");
571		in_addr_slistentry(src.ims_rec, "recorded");
572		in_addr_slistentry(src.ims_in, "included");
573		in_addr_slistentry(src.ims_ex, "excluded");
574		in_addr_slistentry(src.ims_alw, "allowed");
575		in_addr_slistentry(src.ims_blk, "blocked");
576		in_addr_slistentry(src.ims_toin, "to-include");
577		in_addr_slistentry(src.ims_ex, "to-exclude");
578#else
579		printf("\n");
580#endif
581	}
582
583	return (NULL);
584}
585
586#ifdef HAVE_IGMPV3
587static void
588in_addr_slistentry(struct in_addr_slist *ias, char *heading)
589{
590	struct in_addr_slist slist;
591	struct ias_head head;
592	struct in_addr_source src;
593
594	if (ias == NULL) {
595		printf("\t\t\t\t%s (none)\n", heading);
596		return;
597	}
598	memset(&slist, 0, sizeof(slist));
599	KREAD(ias, &slist, struct in_addr_source);
600	printf("\t\t\t\t%s (entry num=%d)\n", heading, slist.numsrc);
601	if (slist.numsrc == 0) {
602		return;
603	}
604	KREAD(slist.head, &head, struct ias_head);
605
606	KREAD(head.lh_first, &src, struct in_addr_source);
607	while (1) {
608		printf("\t\t\t\t\tsource %s (ref=%d)\n",
609			inet_ntoa(src.ias_addr.sin_addr), src.ias_refcount);
610		if (src.ias_list.le_next == NULL)
611			break;
612		KREAD(src.ias_list.le_next, &src, struct in_addr_source);
613	}
614	return;
615}
616#endif /* HAVE_IGMPV3 */
617
618#endif /* INET */
619
620#endif /* WITH_KVM */
621
622static int
623ifmcstat_getifmaddrs(void)
624{
625	char			 thisifname[IFNAMSIZ];
626	char			 addrbuf[INET6_ADDRSTRLEN];
627	struct ifaddrs		*ifap, *ifa;
628	struct ifmaddrs		*ifmap, *ifma;
629	sockunion_t		 lastifasa;
630	sockunion_t		*psa, *pgsa, *pllsa, *pifasa;
631	char			*pcolon;
632	char			*pafname;
633	uint32_t		 lastifindex, thisifindex;
634	int			 error;
635
636	error = 0;
637	ifap = NULL;
638	ifmap = NULL;
639	lastifindex = 0;
640	thisifindex = 0;
641	lastifasa.ss.ss_family = AF_UNSPEC;
642
643	if (getifaddrs(&ifap) != 0) {
644		warn("getifmaddrs");
645		return (-1);
646	}
647
648	if (getifmaddrs(&ifmap) != 0) {
649		warn("getifmaddrs");
650		error = -1;
651		goto out;
652	}
653
654	for (ifma = ifmap; ifma; ifma = ifma->ifma_next) {
655		error = 0;
656		if (ifma->ifma_name == NULL || ifma->ifma_addr == NULL)
657			continue;
658
659		psa = (sockunion_t *)ifma->ifma_name;
660		if (psa->sa.sa_family != AF_LINK) {
661			fprintf(stderr,
662			    "WARNING: Kernel returned invalid data.\n");
663			error = -1;
664			break;
665		}
666
667		/* Filter on interface name. */
668		thisifindex = psa->sdl.sdl_index;
669		if (ifindex != 0 && thisifindex != ifindex)
670			continue;
671
672		/* Filter on address family. */
673		pgsa = (sockunion_t *)ifma->ifma_addr;
674		if (af != 0 && pgsa->sa.sa_family != af)
675			continue;
676
677		strlcpy(thisifname, link_ntoa(&psa->sdl), IFNAMSIZ);
678		pcolon = strchr(thisifname, ':');
679		if (pcolon)
680			*pcolon = '\0';
681
682		/* Only print the banner for the first ifmaddrs entry. */
683		if (lastifindex == 0 || lastifindex != thisifindex) {
684			lastifindex = thisifindex;
685			fprintf(stdout, "%s:\n", thisifname);
686		}
687
688		/*
689		 * Currently, multicast joins only take place on the
690		 * primary IPv4 address, and only on the link-local IPv6
691		 * address, as per IGMPv2/3 and MLDv1/2 semantics.
692		 * Therefore, we only look up the primary address on
693		 * the first pass.
694		 */
695		pifasa = NULL;
696		for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
697			if ((strcmp(ifa->ifa_name, thisifname) != 0) ||
698			    (ifa->ifa_addr == NULL) ||
699			    (ifa->ifa_addr->sa_family != pgsa->sa.sa_family))
700				continue;
701#ifdef INET6
702			/*
703			 * For AF_INET6 only the link-local address should
704			 * be returned.
705			 * XXX: ifmcstat actually prints all of the inet6
706			 * addresses, but never mind...
707			 */
708			pifasa = (sockunion_t *)ifa->ifa_addr;
709			if (pifasa->sa.sa_family == AF_INET6 &&
710			    !IN6_IS_ADDR_LINKLOCAL(&pifasa->sin6.sin6_addr)) {
711				pifasa = NULL;
712				continue;
713			}
714#endif
715			break;
716		}
717		if (pifasa == NULL)
718			continue;	/* primary address not found */
719
720		/* Parse and print primary address, if not already printed. */
721		if (lastifasa.ss.ss_family == AF_UNSPEC ||
722		    ((lastifasa.ss.ss_family == AF_LINK &&
723		      !sa_dl_equal(&lastifasa.sa, &pifasa->sa)) ||
724		     !sa_equal(&lastifasa.sa, &pifasa->sa))) {
725
726			switch (pifasa->sa.sa_family) {
727			case AF_INET:
728				pafname = "inet";
729				break;
730			case AF_INET6:
731				pafname = "inet6";
732				break;
733			case AF_LINK:
734				pafname = "link";
735				break;
736			default:
737				pafname = "unknown";
738				break;
739			}
740
741			switch (pifasa->sa.sa_family) {
742			case AF_INET:
743			case AF_INET6:
744			case AF_LINK:
745				error = getnameinfo(&pifasa->sa,
746				    pifasa->sa.sa_len,
747				    addrbuf, sizeof(addrbuf), NULL, 0,
748				    NI_NUMERICHOST);
749				if (error)
750					perror("getnameinfo");
751				break;
752			default:
753				addrbuf[0] = '\0';
754				break;
755			}
756
757			fprintf(stdout, "\t%s %s\n", pafname, addrbuf);
758			lastifasa = *pifasa;
759		}
760
761		/* Print this group address. */
762		error = getnameinfo(&pgsa->sa, pgsa->sa.sa_len, addrbuf,
763		    sizeof(addrbuf), NULL, 0, NI_NUMERICHOST);
764		if (error)
765			perror("getnameinfo");
766		fprintf(stdout, "\t\tgroup %s\n", addrbuf);
767
768		/* Link-layer mapping, if present. */
769		pllsa = (sockunion_t *)ifma->ifma_lladdr;
770		if (pllsa != NULL) {
771			error = getnameinfo(&pifasa->sa, pifasa->sa.sa_len,
772			    addrbuf, sizeof(addrbuf), NULL, 0, NI_NUMERICHOST);
773			fprintf(stdout, "\t\t\tmcast-macaddr %s\n", addrbuf);
774		}
775	}
776out:
777	if (ifmap != NULL)
778		freeifmaddrs(ifmap);
779	if (ifap != NULL)
780		freeifaddrs(ifap);
781
782	return (error);
783}
784