if.c revision 308717 
1/*	$FreeBSD: stable/10/usr.sbin/rtadvd/if.c 308717 2016-11-16 03:54:41Z hrs $	*/
2/*	$KAME: if.c,v 1.17 2001/01/21 15:27:30 itojun Exp $	*/
3
4/*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * Copyright (C) 2011 Hiroki Sato <hrs@FreeBSD.org>
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/param.h>
35#include <sys/socket.h>
36#include <sys/sysctl.h>
37#include <sys/ioctl.h>
38#include <net/if.h>
39#include <net/if_dl.h>
40#include <net/if_types.h>
41#include <net/if_var.h>
42#include <net/ethernet.h>
43#include <net/route.h>
44#include <netinet/in.h>
45#include <netinet/in_var.h>
46#include <netinet/ip6.h>
47#include <netinet/icmp6.h>
48#include <netinet6/nd6.h>
49#include <unistd.h>
50#include <errno.h>
51#include <netdb.h>
52#include <stdlib.h>
53#include <string.h>
54#include <syslog.h>
55
56#include "pathnames.h"
57#include "rtadvd.h"
58#include "if.h"
59
60#define ROUNDUP(a, size)					\
61	(((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
62
63#define	NEXT_SA(ap)							\
64	(ap) = (struct sockaddr *)((caddr_t)(ap) +			\
65	    ((ap)->sa_len ? ROUNDUP((ap)->sa_len, sizeof(u_long)) :	\
66	    sizeof(u_long)))
67
68struct sockaddr_in6 sin6_linklocal_allnodes = {
69        .sin6_len =     sizeof(sin6_linklocal_allnodes),
70        .sin6_family =  AF_INET6,
71        .sin6_addr =    IN6ADDR_LINKLOCAL_ALLNODES_INIT,
72};
73
74struct sockaddr_in6 sin6_linklocal_allrouters = {
75        .sin6_len =     sizeof(sin6_linklocal_allrouters),
76        .sin6_family =  AF_INET6,
77        .sin6_addr =    IN6ADDR_LINKLOCAL_ALLROUTERS_INIT,
78};
79
80struct sockaddr_in6 sin6_sitelocal_allrouters = {
81        .sin6_len =     sizeof(sin6_sitelocal_allrouters),
82        .sin6_family =  AF_INET6,
83        .sin6_addr =    IN6ADDR_SITELOCAL_ALLROUTERS_INIT,
84};
85
86struct sockinfo sock = { .si_fd = -1, .si_name = NULL };
87struct sockinfo rtsock = { .si_fd = -1, .si_name = NULL };
88struct sockinfo ctrlsock = { .si_fd = -1, .si_name = _PATH_CTRL_SOCK };
89
90char *mcastif;
91
92static void		get_rtaddrs(int, struct sockaddr *,
93			    struct sockaddr **);
94static struct if_msghdr	*get_next_msghdr(struct if_msghdr *,
95			    struct if_msghdr *);
96
97static void
98get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
99{
100	int i;
101
102	for (i = 0; i < RTAX_MAX; i++) {
103		if (addrs & (1 << i)) {
104			rti_info[i] = sa;
105			NEXT_SA(sa);
106		}
107		else
108			rti_info[i] = NULL;
109	}
110}
111
112#define ROUNDUP8(a) (1 + (((a) - 1) | 7))
113int
114lladdropt_length(struct sockaddr_dl *sdl)
115{
116	switch (sdl->sdl_type) {
117	case IFT_ETHER:
118	case IFT_L2VLAN:
119	case IFT_BRIDGE:
120		return (ROUNDUP8(ETHER_ADDR_LEN + 2));
121	default:
122		return (0);
123	}
124}
125
126void
127lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
128{
129	char *addr;
130
131	ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
132
133	switch (sdl->sdl_type) {
134	case IFT_ETHER:
135	case IFT_L2VLAN:
136	case IFT_BRIDGE:
137		ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
138		addr = (char *)(ndopt + 1);
139		memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
140		break;
141	default:
142		syslog(LOG_ERR, "<%s> unsupported link type(%d)",
143		    __func__, sdl->sdl_type);
144		exit(1);
145	}
146
147	return;
148}
149
150int
151rtbuf_len(void)
152{
153	size_t len;
154	int mib[6] = {CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0};
155
156	if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
157		return (-1);
158
159	return (len);
160}
161
162#define FILTER_MATCH(type, filter) ((0x1 << type) & filter)
163#define SIN6(s) ((struct sockaddr_in6 *)(s))
164#define SDL(s) ((struct sockaddr_dl *)(s))
165char *
166get_next_msg(char *buf, char *lim, int ifindex, size_t *lenp, int filter)
167{
168	struct rt_msghdr *rtm;
169	struct ifa_msghdr *ifam;
170	struct sockaddr *sa, *dst, *gw, *ifa, *rti_info[RTAX_MAX];
171
172	*lenp = 0;
173	for (rtm = (struct rt_msghdr *)buf;
174	     rtm < (struct rt_msghdr *)lim;
175	     rtm = (struct rt_msghdr *)(((char *)rtm) + rtm->rtm_msglen)) {
176		/* just for safety */
177		if (!rtm->rtm_msglen) {
178			syslog(LOG_WARNING, "<%s> rtm_msglen is 0 "
179			    "(buf=%p lim=%p rtm=%p)", __func__,
180			    buf, lim, rtm);
181			break;
182		}
183		if (((struct rt_msghdr *)buf)->rtm_version != RTM_VERSION) {
184			syslog(LOG_WARNING,
185			    "<%s> routing message version mismatch "
186			    "(buf=%p lim=%p rtm=%p)", __func__,
187			    buf, lim, rtm);
188			continue;
189		}
190
191		if (FILTER_MATCH(rtm->rtm_type, filter) == 0)
192			continue;
193
194		switch (rtm->rtm_type) {
195		case RTM_GET:
196		case RTM_ADD:
197		case RTM_DELETE:
198			/* address related checks */
199			sa = (struct sockaddr *)(rtm + 1);
200			get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
201			if ((dst = rti_info[RTAX_DST]) == NULL ||
202			    dst->sa_family != AF_INET6)
203				continue;
204
205			if (IN6_IS_ADDR_LINKLOCAL(&SIN6(dst)->sin6_addr) ||
206			    IN6_IS_ADDR_MULTICAST(&SIN6(dst)->sin6_addr))
207				continue;
208
209			if ((gw = rti_info[RTAX_GATEWAY]) == NULL ||
210			    gw->sa_family != AF_LINK)
211				continue;
212			if (ifindex && SDL(gw)->sdl_index != ifindex)
213				continue;
214
215			if (rti_info[RTAX_NETMASK] == NULL)
216				continue;
217
218			/* found */
219			*lenp = rtm->rtm_msglen;
220			return (char *)rtm;
221			/* NOTREACHED */
222		case RTM_NEWADDR:
223		case RTM_DELADDR:
224			ifam = (struct ifa_msghdr *)rtm;
225
226			/* address related checks */
227			sa = (struct sockaddr *)(ifam + 1);
228			get_rtaddrs(ifam->ifam_addrs, sa, rti_info);
229			if ((ifa = rti_info[RTAX_IFA]) == NULL ||
230			    (ifa->sa_family != AF_INET &&
231			     ifa->sa_family != AF_INET6))
232				continue;
233
234			if (ifa->sa_family == AF_INET6 &&
235			    (IN6_IS_ADDR_LINKLOCAL(&SIN6(ifa)->sin6_addr) ||
236			     IN6_IS_ADDR_MULTICAST(&SIN6(ifa)->sin6_addr)))
237				continue;
238
239			if (ifindex && ifam->ifam_index != ifindex)
240				continue;
241
242			/* found */
243			*lenp = ifam->ifam_msglen;
244			return (char *)rtm;
245			/* NOTREACHED */
246		case RTM_IFINFO:
247		case RTM_IFANNOUNCE:
248			/* found */
249			*lenp = rtm->rtm_msglen;
250			return (char *)rtm;
251			/* NOTREACHED */
252		}
253	}
254
255	return ((char *)rtm);
256}
257#undef FILTER_MATCH
258
259struct in6_addr *
260get_addr(char *buf)
261{
262	struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
263	struct sockaddr *sa, *rti_info[RTAX_MAX];
264
265	sa = (struct sockaddr *)(rtm + 1);
266	get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
267
268	return (&SIN6(rti_info[RTAX_DST])->sin6_addr);
269}
270
271int
272get_rtm_ifindex(char *buf)
273{
274	struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
275	struct sockaddr *sa, *rti_info[RTAX_MAX];
276
277	sa = (struct sockaddr *)(rtm + 1);
278	get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
279
280	return (((struct sockaddr_dl *)rti_info[RTAX_GATEWAY])->sdl_index);
281}
282
283int
284get_prefixlen(char *buf)
285{
286	struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
287	struct sockaddr *sa, *rti_info[RTAX_MAX];
288	char *p, *lim;
289
290	sa = (struct sockaddr *)(rtm + 1);
291	get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
292	sa = rti_info[RTAX_NETMASK];
293
294	p = (char *)(&SIN6(sa)->sin6_addr);
295	lim = (char *)sa + sa->sa_len;
296	return prefixlen(p, lim);
297}
298
299int
300prefixlen(unsigned char *p, unsigned char *lim)
301{
302	int masklen;
303
304	for (masklen = 0; p < lim; p++) {
305		switch (*p) {
306		case 0xff:
307			masklen += 8;
308			break;
309		case 0xfe:
310			masklen += 7;
311			break;
312		case 0xfc:
313			masklen += 6;
314			break;
315		case 0xf8:
316			masklen += 5;
317			break;
318		case 0xf0:
319			masklen += 4;
320			break;
321		case 0xe0:
322			masklen += 3;
323			break;
324		case 0xc0:
325			masklen += 2;
326			break;
327		case 0x80:
328			masklen += 1;
329			break;
330		case 0x00:
331			break;
332		default:
333			return (-1);
334		}
335	}
336
337	return (masklen);
338}
339
340struct ifinfo *
341update_persist_ifinfo(struct ifilist_head_t *ifi_head, const char *ifname)
342{
343	struct ifinfo *ifi;
344	int ifindex;
345
346	ifi = NULL;
347	ifindex = if_nametoindex(ifname);
348	TAILQ_FOREACH(ifi, ifi_head, ifi_next) {
349		if (ifindex != 0) {
350			if (ifindex == ifi->ifi_ifindex)
351				break;
352		} else {
353			if (strncmp(ifname, ifi->ifi_ifname,
354				sizeof(ifi->ifi_ifname)) == 0)
355				break;
356		}
357	}
358
359	if (ifi == NULL) {
360		/* A new ifinfo element is needed. */
361		syslog(LOG_DEBUG, "<%s> new entry: %s", __func__,
362		    ifname);
363
364		ELM_MALLOC(ifi, exit(1));
365		ifi->ifi_ifindex = 0;
366		strlcpy(ifi->ifi_ifname, ifname, sizeof(ifi->ifi_ifname));
367		ifi->ifi_rainfo = NULL;
368		ifi->ifi_state = IFI_STATE_UNCONFIGURED;
369		TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next);
370	}
371
372	ifi->ifi_persist = 1;
373
374	syslog(LOG_DEBUG, "<%s> %s is marked PERSIST", __func__,
375	    ifi->ifi_ifname);
376	syslog(LOG_DEBUG, "<%s> %s is state = %d", __func__,
377	    ifi->ifi_ifname, ifi->ifi_state);
378	return (ifi);
379}
380
381int
382update_ifinfo_nd_flags(struct ifinfo *ifi)
383{
384	struct in6_ndireq nd;
385	int s;
386	int error;
387
388	if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
389		syslog(LOG_ERR,
390		    "<%s> socket() failed.", __func__);
391		return (1);
392	}
393	/* ND flags */
394	memset(&nd, 0, sizeof(nd));
395	strlcpy(nd.ifname, ifi->ifi_ifname,
396	    sizeof(nd.ifname));
397	error = ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd);
398	if (error) {
399		close(s);
400		if (errno != EPFNOSUPPORT)
401			syslog(LOG_ERR, "<%s> ioctl() failed.", __func__);
402		return (1);
403	}
404	ifi->ifi_nd_flags = nd.ndi.flags;
405	close(s);
406
407	return (0);
408}
409
410struct ifinfo *
411update_ifinfo(struct ifilist_head_t *ifi_head, int ifindex)
412{
413	struct if_msghdr *ifm;
414	struct ifinfo *ifi = NULL;
415	struct sockaddr *sa;
416	struct sockaddr *rti_info[RTAX_MAX];
417	char *msg;
418	size_t len;
419	char *lim;
420	int mib[] = { CTL_NET, PF_ROUTE, 0, AF_INET6, NET_RT_IFLIST, 0 };
421	int error;
422
423	syslog(LOG_DEBUG, "<%s> enter", __func__);
424
425	if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), NULL, &len, NULL, 0) <
426	    0) {
427		syslog(LOG_ERR,
428		    "<%s> sysctl: NET_RT_IFLIST size get failed", __func__);
429		exit(1);
430	}
431	if ((msg = malloc(len)) == NULL) {
432		syslog(LOG_ERR, "<%s> malloc failed", __func__);
433		exit(1);
434	}
435	if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), msg, &len, NULL, 0) <
436	    0) {
437		syslog(LOG_ERR,
438		    "<%s> sysctl: NET_RT_IFLIST get failed", __func__);
439		exit(1);
440	}
441
442	lim = msg + len;
443	for (ifm = (struct if_msghdr *)msg;
444	     ifm != NULL && ifm < (struct if_msghdr *)lim;
445	     ifm = get_next_msghdr(ifm,(struct if_msghdr *)lim)) {
446		int ifi_new;
447
448		syslog(LOG_DEBUG, "<%s> ifm = %p, lim = %p, diff = %zu",
449		    __func__, ifm, lim, (char *)lim - (char *)ifm);
450
451		if (ifm->ifm_version != RTM_VERSION) {
452			syslog(LOG_ERR,
453			    "<%s> ifm_vesrion mismatch", __func__);
454			exit(1);
455		}
456		if (ifm->ifm_msglen == 0) {
457			syslog(LOG_WARNING,
458			    "<%s> ifm_msglen is 0", __func__);
459			free(msg);
460			return (NULL);
461		}
462
463		ifi_new = 0;
464		if (ifm->ifm_type == RTM_IFINFO) {
465			struct ifreq ifr;
466			int s;
467			char ifname[IFNAMSIZ];
468
469			syslog(LOG_DEBUG, "<%s> RTM_IFINFO found. "
470			    "ifm_index = %d, ifindex = %d",
471			    __func__, ifm->ifm_index, ifindex);
472
473			/* when ifindex is specified */
474			if (ifindex != UPDATE_IFINFO_ALL &&
475			    ifindex != ifm->ifm_index)
476				continue;
477
478			/* lookup an entry with the same ifindex */
479			TAILQ_FOREACH(ifi, ifi_head, ifi_next) {
480				if (ifm->ifm_index == ifi->ifi_ifindex)
481					break;
482				if_indextoname(ifm->ifm_index, ifname);
483				if (strncmp(ifname, ifi->ifi_ifname,
484					sizeof(ifname)) == 0)
485					break;
486			}
487			if (ifi == NULL) {
488				syslog(LOG_DEBUG,
489				    "<%s> new entry for idx=%d",
490				    __func__, ifm->ifm_index);
491				ELM_MALLOC(ifi, exit(1));
492				ifi->ifi_rainfo = NULL;
493				ifi->ifi_state = IFI_STATE_UNCONFIGURED;
494				ifi->ifi_persist = 0;
495				ifi_new = 1;
496			}
497			/* ifindex */
498			ifi->ifi_ifindex = ifm->ifm_index;
499
500			/* ifname */
501			if_indextoname(ifm->ifm_index, ifi->ifi_ifname);
502			if (ifi->ifi_ifname == NULL) {
503				syslog(LOG_WARNING,
504				    "<%s> ifname not found (idx=%d)",
505				    __func__, ifm->ifm_index);
506				if (ifi_new)
507					free(ifi);
508				continue;
509			}
510
511			if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
512				syslog(LOG_ERR,
513				    "<%s> socket() failed.", __func__);
514				if (ifi_new)
515					free(ifi);
516				continue;
517			}
518
519			/* MTU  */
520			ifi->ifi_phymtu = ifm->ifm_data.ifi_mtu;
521			if (ifi->ifi_phymtu == 0) {
522				memset(&ifr, 0, sizeof(ifr));
523				ifr.ifr_addr.sa_family = AF_INET6;
524				strlcpy(ifr.ifr_name, ifi->ifi_ifname,
525				    sizeof(ifr.ifr_name));
526				error = ioctl(s, SIOCGIFMTU, (caddr_t)&ifr);
527				if (error) {
528					close(s);
529					syslog(LOG_ERR,
530					    "<%s> ioctl() failed.",
531					    __func__);
532					if (ifi_new)
533						free(ifi);
534					continue;
535				}
536				ifi->ifi_phymtu = ifr.ifr_mtu;
537				if (ifi->ifi_phymtu == 0) {
538					syslog(LOG_WARNING,
539					    "<%s> no interface mtu info"
540					    " on %s.  %d will be used.",
541					    __func__, ifi->ifi_ifname,
542					    IPV6_MMTU);
543					ifi->ifi_phymtu = IPV6_MMTU;
544				}
545			}
546			close(s);
547
548			/* ND flags */
549			error = update_ifinfo_nd_flags(ifi);
550			if (error) {
551				if (ifi_new)
552					free(ifi);
553				continue;
554			}
555
556			/* SDL */
557			sa = (struct sockaddr *)(ifm + 1);
558			get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
559			if ((sa = rti_info[RTAX_IFP]) != NULL) {
560				if (sa->sa_family == AF_LINK) {
561					memcpy(&ifi->ifi_sdl,
562					    (struct sockaddr_dl *)sa,
563					    sizeof(ifi->ifi_sdl));
564				}
565			} else
566				memset(&ifi->ifi_sdl, 0,
567				    sizeof(ifi->ifi_sdl));
568
569			/* flags */
570			ifi->ifi_flags = ifm->ifm_flags;
571
572			/* type */
573			ifi->ifi_type = ifm->ifm_type;
574		} else {
575			syslog(LOG_ERR,
576			    "out of sync parsing NET_RT_IFLIST\n"
577			    "expected %d, got %d\n msglen = %d\n",
578			    RTM_IFINFO, ifm->ifm_type, ifm->ifm_msglen);
579			exit(1);
580		}
581
582		if (ifi_new) {
583			syslog(LOG_DEBUG,
584			    "<%s> adding %s(idx=%d) to ifilist",
585			    __func__, ifi->ifi_ifname, ifi->ifi_ifindex);
586			TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next);
587		}
588	}
589	free(msg);
590
591	if (mcastif != NULL) {
592		error = sock_mc_rr_update(&sock, mcastif);
593		if (error)
594			exit(1);
595	}
596
597	return (ifi);
598}
599
600static struct if_msghdr *
601get_next_msghdr(struct if_msghdr *ifm, struct if_msghdr *lim)
602{
603	struct ifa_msghdr *ifam;
604
605	for (ifam = (struct ifa_msghdr *)((char *)ifm + ifm->ifm_msglen);
606	     ifam < (struct ifa_msghdr *)lim;
607	     ifam = (struct ifa_msghdr *)((char *)ifam + ifam->ifam_msglen)) {
608		if (!ifam->ifam_msglen) {
609			syslog(LOG_WARNING,
610			    "<%s> ifa_msglen is 0", __func__);
611			return (NULL);
612		}
613		if (ifam->ifam_type != RTM_NEWADDR)
614			break;
615	}
616
617	return ((struct if_msghdr *)ifam);
618}
619
620int
621getinet6sysctl(int code)
622{
623	int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
624	int value;
625	size_t size;
626
627	mib[3] = code;
628	size = sizeof(value);
629	if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0)
630	    < 0) {
631		syslog(LOG_ERR, "<%s>: failed to get ip6 sysctl(%d): %s",
632		    __func__, code,
633		    strerror(errno));
634		return (-1);
635	}
636	else
637		return (value);
638}
639
640
641int
642sock_mc_join(struct sockinfo *s, int ifindex)
643{
644	struct ipv6_mreq mreq;
645	char ifname[IFNAMSIZ];
646
647	syslog(LOG_DEBUG, "<%s> enter", __func__);
648
649	if (ifindex == 0)
650		return (1);
651
652	/*
653	 * join all routers multicast address on each advertising
654	 * interface.
655	 */
656	memset(&mreq, 0, sizeof(mreq));
657	/* XXX */
658	memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
659	    &sin6_linklocal_allrouters.sin6_addr,
660	    sizeof(mreq.ipv6mr_multiaddr.s6_addr));
661
662	mreq.ipv6mr_interface = ifindex;
663	if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
664		sizeof(mreq)) < 0) {
665		syslog(LOG_ERR,
666		    "<%s> IPV6_JOIN_GROUP(link) on %s: %s",
667		    __func__, if_indextoname(ifindex, ifname),
668		    strerror(errno));
669		return (1);
670	}
671	syslog(LOG_DEBUG,
672	    "<%s> %s: join link-local all-routers MC group",
673	    __func__, if_indextoname(ifindex, ifname));
674
675	return (0);
676}
677
678int
679sock_mc_leave(struct sockinfo *s, int ifindex)
680{
681	struct ipv6_mreq mreq;
682	char ifname[IFNAMSIZ];
683
684	syslog(LOG_DEBUG, "<%s> enter", __func__);
685
686	if (ifindex == 0)
687		return (1);
688
689	/*
690	 * join all routers multicast address on each advertising
691	 * interface.
692	 */
693
694	memset(&mreq, 0, sizeof(mreq));
695	/* XXX */
696	memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
697	    &sin6_linklocal_allrouters.sin6_addr,
698	    sizeof(mreq.ipv6mr_multiaddr.s6_addr));
699
700	mreq.ipv6mr_interface = ifindex;
701	if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq,
702		sizeof(mreq)) < 0) {
703		syslog(LOG_ERR,
704		    "<%s> IPV6_JOIN_LEAVE(link) on %s: %s",
705		    __func__, if_indextoname(ifindex, ifname),
706		    strerror(errno));
707		return (1);
708	}
709	syslog(LOG_DEBUG,
710	    "<%s> %s: leave link-local all-routers MC group",
711	    __func__, if_indextoname(ifindex, ifname));
712
713	return (0);
714}
715
716int
717sock_mc_rr_update(struct sockinfo *s, char *mif)
718{
719	struct ipv6_mreq mreq;
720
721	syslog(LOG_DEBUG, "<%s> enter", __func__);
722
723	if (mif == NULL)
724		return (1);
725	/*
726	 * When attending router renumbering, join all-routers site-local
727	 * multicast group.
728	 */
729	/* XXX */
730	memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
731	    &sin6_sitelocal_allrouters.sin6_addr,
732	    sizeof(mreq.ipv6mr_multiaddr.s6_addr));
733	if ((mreq.ipv6mr_interface = if_nametoindex(mif)) == 0) {
734		syslog(LOG_ERR,
735		    "<%s> invalid interface: %s",
736		    __func__, mif);
737		return (1);
738	}
739
740	if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP,
741		&mreq, sizeof(mreq)) < 0) {
742		syslog(LOG_ERR,
743		    "<%s> IPV6_JOIN_GROUP(site) on %s: %s",
744		    __func__, mif, strerror(errno));
745		return (1);
746	}
747
748	syslog(LOG_DEBUG,
749	    "<%s> %s: join site-local all-routers MC group",
750	    __func__, mif);
751
752	return (0);
753}
754