xref: /freebsd/usr.sbin/ifmcstat/ifmcstat.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
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("$FreeBSD$");
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 
99 union 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 };
110 typedef union sockunion sockunion_t;
111 
112 uint32_t	ifindex = 0;
113 int		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
132 static void		if_addrlist(struct ifaddr *);
133 static struct in_multi *
134 			in_multientry(struct in_multi *);
135 #ifdef HAVE_IGMPV3
136 static void		in_addr_slistentry(struct in_addr_slist *, char *);
137 #endif
138 #endif /* INET */
139 
140 #ifdef INET6
141 static void		if6_addrlist(struct ifaddr *);
142 static struct in6_multi *
143 			in6_multientry(struct in6_multi *);
144 #ifdef HAVE_MLDV2
145 static void		in6_addr_slistentry(struct in6_addr_slist *, char *);
146 #endif
147 static const char *	inet6_n2a(struct in6_addr *);
148 #endif /* INET6 */
149 
150 static void		kread(u_long, void *, int);
151 static 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 
156 kvm_t	*kvmd;
157 struct	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 
165 static int		ifmcstat_getifmaddrs(void);
166 int			main(int, char **);
167 
168 int
169 main(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 
250 static int
251 ifmcstat_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
283 next:
284 		ifp = nifp;
285 	}
286 
287 	return (0);
288 }
289 
290 static void
291 kread(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 
302 static const char *
303 inet6_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 
330 static void
331 if6_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 
383 static struct in6_multi *
384 in6_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
437 static void
438 in6_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 
473 static void
474 if_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 
526 static struct in_multi *
527 in_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
587 static void
588 in_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 
622 static int
623 ifmcstat_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 	}
776 out:
777 	if (ifmap != NULL)
778 		freeifmaddrs(ifmap);
779 	if (ifap != NULL)
780 		freeifaddrs(ifap);
781 
782 	return (error);
783 }
784