1/*	$KAME: if.c,v 1.17 2001/01/21 15:27:30 itojun Exp $	*/
2
3/*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * Copyright (C) 2011 Hiroki Sato <hrs@FreeBSD.org>
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the project nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/param.h>
36#include <sys/socket.h>
37#include <sys/sysctl.h>
38#include <sys/ioctl.h>
39#include <net/if.h>
40#include <net/if_dl.h>
41#include <net/if_types.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
148int
149rtbuf_len(void)
150{
151	size_t len;
152	int mib[6] = {CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0};
153
154	if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
155		return (-1);
156
157	return (len);
158}
159
160#define FILTER_MATCH(type, filter) ((0x1 << type) & filter)
161#define SIN6(s) ((struct sockaddr_in6 *)(s))
162#define SDL(s) ((struct sockaddr_dl *)(s))
163char *
164get_next_msg(char *buf, char *lim, int ifindex, size_t *lenp, int filter)
165{
166	struct rt_msghdr *rtm;
167	struct ifa_msghdr *ifam;
168	struct sockaddr *sa, *dst, *gw, *ifa, *rti_info[RTAX_MAX];
169
170	*lenp = 0;
171	for (rtm = (struct rt_msghdr *)buf;
172	     rtm < (struct rt_msghdr *)lim;
173	     rtm = (struct rt_msghdr *)(((char *)rtm) + rtm->rtm_msglen)) {
174		/* just for safety */
175		if (!rtm->rtm_msglen) {
176			syslog(LOG_WARNING, "<%s> rtm_msglen is 0 "
177			    "(buf=%p lim=%p rtm=%p)", __func__,
178			    buf, lim, rtm);
179			break;
180		}
181		if (((struct rt_msghdr *)buf)->rtm_version != RTM_VERSION) {
182			syslog(LOG_WARNING,
183			    "<%s> routing message version mismatch "
184			    "(buf=%p lim=%p rtm=%p)", __func__,
185			    buf, lim, rtm);
186			continue;
187		}
188
189		if (FILTER_MATCH(rtm->rtm_type, filter) == 0)
190			continue;
191
192		switch (rtm->rtm_type) {
193		case RTM_GET:
194		case RTM_ADD:
195		case RTM_DELETE:
196			/* address related checks */
197			sa = (struct sockaddr *)(rtm + 1);
198			get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
199			if ((dst = rti_info[RTAX_DST]) == NULL ||
200			    dst->sa_family != AF_INET6)
201				continue;
202
203			if (IN6_IS_ADDR_LINKLOCAL(&SIN6(dst)->sin6_addr) ||
204			    IN6_IS_ADDR_MULTICAST(&SIN6(dst)->sin6_addr))
205				continue;
206
207			if ((gw = rti_info[RTAX_GATEWAY]) == NULL ||
208			    gw->sa_family != AF_LINK)
209				continue;
210			if (ifindex && SDL(gw)->sdl_index != ifindex)
211				continue;
212
213			if (rti_info[RTAX_NETMASK] == NULL)
214				continue;
215
216			/* found */
217			*lenp = rtm->rtm_msglen;
218			return (char *)rtm;
219			/* NOTREACHED */
220		case RTM_NEWADDR:
221		case RTM_DELADDR:
222			ifam = (struct ifa_msghdr *)rtm;
223
224			/* address related checks */
225			sa = (struct sockaddr *)(ifam + 1);
226			get_rtaddrs(ifam->ifam_addrs, sa, rti_info);
227			if ((ifa = rti_info[RTAX_IFA]) == NULL ||
228			    (ifa->sa_family != AF_INET &&
229			     ifa->sa_family != AF_INET6))
230				continue;
231
232			if (ifa->sa_family == AF_INET6 &&
233			    (IN6_IS_ADDR_LINKLOCAL(&SIN6(ifa)->sin6_addr) ||
234			     IN6_IS_ADDR_MULTICAST(&SIN6(ifa)->sin6_addr)))
235				continue;
236
237			if (ifindex && ifam->ifam_index != ifindex)
238				continue;
239
240			/* found */
241			*lenp = ifam->ifam_msglen;
242			return (char *)rtm;
243			/* NOTREACHED */
244		case RTM_IFINFO:
245		case RTM_IFANNOUNCE:
246			/* found */
247			*lenp = rtm->rtm_msglen;
248			return (char *)rtm;
249			/* NOTREACHED */
250		}
251	}
252
253	return ((char *)rtm);
254}
255#undef FILTER_MATCH
256
257struct in6_addr *
258get_addr(char *buf)
259{
260	struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
261	struct sockaddr *sa, *rti_info[RTAX_MAX];
262
263	sa = (struct sockaddr *)(rtm + 1);
264	get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
265
266	return (&SIN6(rti_info[RTAX_DST])->sin6_addr);
267}
268
269int
270get_rtm_ifindex(char *buf)
271{
272	struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
273	struct sockaddr *sa, *rti_info[RTAX_MAX];
274
275	sa = (struct sockaddr *)(rtm + 1);
276	get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
277
278	return (((struct sockaddr_dl *)rti_info[RTAX_GATEWAY])->sdl_index);
279}
280
281int
282get_prefixlen(char *buf)
283{
284	struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
285	struct sockaddr *sa, *rti_info[RTAX_MAX];
286	char *p, *lim;
287
288	sa = (struct sockaddr *)(rtm + 1);
289	get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
290	sa = rti_info[RTAX_NETMASK];
291
292	p = (char *)(&SIN6(sa)->sin6_addr);
293	lim = (char *)sa + sa->sa_len;
294	return prefixlen(p, lim);
295}
296
297int
298prefixlen(unsigned char *p, unsigned char *lim)
299{
300	int masklen;
301
302	for (masklen = 0; p < lim; p++) {
303		switch (*p) {
304		case 0xff:
305			masklen += 8;
306			break;
307		case 0xfe:
308			masklen += 7;
309			break;
310		case 0xfc:
311			masklen += 6;
312			break;
313		case 0xf8:
314			masklen += 5;
315			break;
316		case 0xf0:
317			masklen += 4;
318			break;
319		case 0xe0:
320			masklen += 3;
321			break;
322		case 0xc0:
323			masklen += 2;
324			break;
325		case 0x80:
326			masklen += 1;
327			break;
328		case 0x00:
329			break;
330		default:
331			return (-1);
332		}
333	}
334
335	return (masklen);
336}
337
338struct ifinfo *
339update_persist_ifinfo(struct ifilist_head_t *ifi_head, const char *ifname)
340{
341	struct ifinfo *ifi;
342	int ifindex;
343
344	ifi = NULL;
345	ifindex = if_nametoindex(ifname);
346	TAILQ_FOREACH(ifi, ifi_head, ifi_next) {
347		if (ifindex != 0) {
348			if (ifindex == ifi->ifi_ifindex)
349				break;
350		} else {
351			if (strncmp(ifname, ifi->ifi_ifname,
352				sizeof(ifi->ifi_ifname)) == 0)
353				break;
354		}
355	}
356
357	if (ifi == NULL) {
358		/* A new ifinfo element is needed. */
359		syslog(LOG_DEBUG, "<%s> new entry: %s", __func__,
360		    ifname);
361
362		ELM_MALLOC(ifi, exit(1));
363		ifi->ifi_ifindex = 0;
364		strlcpy(ifi->ifi_ifname, ifname, sizeof(ifi->ifi_ifname));
365		ifi->ifi_rainfo = NULL;
366		ifi->ifi_state = IFI_STATE_UNCONFIGURED;
367		TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next);
368	}
369
370	ifi->ifi_persist = 1;
371
372	syslog(LOG_DEBUG, "<%s> %s is marked PERSIST", __func__,
373	    ifi->ifi_ifname);
374	syslog(LOG_DEBUG, "<%s> %s is state = %d", __func__,
375	    ifi->ifi_ifname, ifi->ifi_state);
376	return (ifi);
377}
378
379int
380update_ifinfo_nd_flags(struct ifinfo *ifi)
381{
382	struct in6_ndireq nd;
383	int s;
384	int error;
385
386	if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
387		syslog(LOG_ERR,
388		    "<%s> socket() failed.", __func__);
389		return (1);
390	}
391	/* ND flags */
392	memset(&nd, 0, sizeof(nd));
393	strlcpy(nd.ifname, ifi->ifi_ifname,
394	    sizeof(nd.ifname));
395	error = ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd);
396	if (error) {
397		close(s);
398		if (errno != EPFNOSUPPORT)
399			syslog(LOG_ERR, "<%s> ioctl() failed.", __func__);
400		return (1);
401	}
402	ifi->ifi_nd_flags = nd.ndi.flags;
403	close(s);
404
405	return (0);
406}
407
408#define MAX_SYSCTL_TRY 5
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, ntry;
422
423	syslog(LOG_DEBUG, "<%s> enter", __func__);
424
425	ntry = 0;
426	do {
427		/*
428		 * We'll try to get addresses several times in case that
429		 * the number of addresses is unexpectedly increased during
430		 * the two sysctl calls.  This should rarely happen.
431		 * Portability note: since FreeBSD does not add margin of
432		 * memory at the first sysctl, the possibility of failure on
433		 * the second sysctl call is a bit higher.
434		 */
435
436		if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) < 0) {
437			syslog(LOG_ERR,
438			    "<%s> sysctl: NET_RT_IFLIST size get failed",
439			    __func__);
440			exit(1);
441		}
442		if ((msg = malloc(len)) == NULL) {
443			syslog(LOG_ERR, "<%s> malloc failed", __func__);
444			exit(1);
445		}
446		if (sysctl(mib, nitems(mib), msg, &len, NULL, 0) < 0) {
447			if (errno != ENOMEM || ++ntry >= MAX_SYSCTL_TRY) {
448				free(msg);
449				syslog(LOG_ERR,
450				    "<%s> sysctl: NET_RT_IFLIST get failed",
451				    __func__);
452				exit(1);
453			}
454			free(msg);
455			msg = NULL;
456		}
457	} while (msg == NULL);
458
459	lim = msg + len;
460	for (ifm = (struct if_msghdr *)msg;
461	     ifm != NULL && ifm < (struct if_msghdr *)lim;
462	     ifm = get_next_msghdr(ifm,(struct if_msghdr *)lim)) {
463		int ifi_new;
464
465		syslog(LOG_DEBUG, "<%s> ifm = %p, lim = %p, diff = %zu",
466		    __func__, ifm, lim, (char *)lim - (char *)ifm);
467
468		if (ifm->ifm_version != RTM_VERSION) {
469			syslog(LOG_ERR,
470			    "<%s> ifm_vesrion mismatch", __func__);
471			exit(1);
472		}
473		if (ifm->ifm_msglen == 0) {
474			syslog(LOG_WARNING,
475			    "<%s> ifm_msglen is 0", __func__);
476			free(msg);
477			return (NULL);
478		}
479
480		ifi_new = 0;
481		if (ifm->ifm_type == RTM_IFINFO) {
482			struct ifreq ifr;
483			int s;
484			char ifname[IFNAMSIZ];
485
486			syslog(LOG_DEBUG, "<%s> RTM_IFINFO found. "
487			    "ifm_index = %d, ifindex = %d",
488			    __func__, ifm->ifm_index, ifindex);
489
490			/* when ifindex is specified */
491			if (ifindex != UPDATE_IFINFO_ALL &&
492			    ifindex != ifm->ifm_index)
493				continue;
494
495			/* ifname */
496			if (if_indextoname(ifm->ifm_index, ifname) == NULL) {
497				syslog(LOG_WARNING,
498				    "<%s> ifname not found (idx=%d)",
499				    __func__, ifm->ifm_index);
500				continue;
501			}
502
503			/* lookup an entry with the same ifindex */
504			TAILQ_FOREACH(ifi, ifi_head, ifi_next) {
505				if (ifm->ifm_index == ifi->ifi_ifindex)
506					break;
507				if (strncmp(ifname, ifi->ifi_ifname,
508					sizeof(ifname)) == 0)
509					break;
510			}
511			if (ifi == NULL) {
512				syslog(LOG_DEBUG,
513				    "<%s> new entry for idx=%d",
514				    __func__, ifm->ifm_index);
515				ELM_MALLOC(ifi, exit(1));
516				ifi->ifi_rainfo = NULL;
517				ifi->ifi_state = IFI_STATE_UNCONFIGURED;
518				ifi->ifi_persist = 0;
519				ifi_new = 1;
520			}
521			/* ifindex */
522			ifi->ifi_ifindex = ifm->ifm_index;
523
524			/* ifname */
525			strlcpy(ifi->ifi_ifname, ifname, IFNAMSIZ);
526
527			if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
528				syslog(LOG_ERR,
529				    "<%s> socket() failed.", __func__);
530				if (ifi_new)
531					free(ifi);
532				continue;
533			}
534
535			/* MTU  */
536			ifi->ifi_phymtu = ifm->ifm_data.ifi_mtu;
537			if (ifi->ifi_phymtu == 0) {
538				memset(&ifr, 0, sizeof(ifr));
539				ifr.ifr_addr.sa_family = AF_INET6;
540				strlcpy(ifr.ifr_name, ifi->ifi_ifname,
541				    sizeof(ifr.ifr_name));
542				error = ioctl(s, SIOCGIFMTU, (caddr_t)&ifr);
543				if (error) {
544					close(s);
545					syslog(LOG_ERR,
546					    "<%s> ioctl() failed.",
547					    __func__);
548					if (ifi_new)
549						free(ifi);
550					continue;
551				}
552				ifi->ifi_phymtu = ifr.ifr_mtu;
553				if (ifi->ifi_phymtu == 0) {
554					syslog(LOG_WARNING,
555					    "<%s> no interface mtu info"
556					    " on %s.  %d will be used.",
557					    __func__, ifi->ifi_ifname,
558					    IPV6_MMTU);
559					ifi->ifi_phymtu = IPV6_MMTU;
560				}
561			}
562			close(s);
563
564			/* ND flags */
565			error = update_ifinfo_nd_flags(ifi);
566			if (error) {
567				if (ifi_new)
568					free(ifi);
569				continue;
570			}
571
572			/* SDL */
573			sa = (struct sockaddr *)(ifm + 1);
574			get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
575			if ((sa = rti_info[RTAX_IFP]) != NULL) {
576				if (sa->sa_family == AF_LINK) {
577					memcpy(&ifi->ifi_sdl,
578					    (struct sockaddr_dl *)sa,
579					    sizeof(ifi->ifi_sdl));
580				}
581			} else
582				memset(&ifi->ifi_sdl, 0,
583				    sizeof(ifi->ifi_sdl));
584
585			/* flags */
586			ifi->ifi_flags = ifm->ifm_flags;
587
588			/* type */
589			ifi->ifi_type = ifm->ifm_type;
590		} else {
591			syslog(LOG_ERR,
592			    "out of sync parsing NET_RT_IFLIST\n"
593			    "expected %d, got %d\n msglen = %d\n",
594			    RTM_IFINFO, ifm->ifm_type, ifm->ifm_msglen);
595			exit(1);
596		}
597
598		if (ifi_new) {
599			syslog(LOG_DEBUG,
600			    "<%s> adding %s(idx=%d) to ifilist",
601			    __func__, ifi->ifi_ifname, ifi->ifi_ifindex);
602			TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next);
603		}
604	}
605	free(msg);
606
607	if (mcastif != NULL) {
608		error = sock_mc_rr_update(&sock, mcastif);
609		if (error)
610			exit(1);
611	}
612
613	return (ifi);
614}
615
616static struct if_msghdr *
617get_next_msghdr(struct if_msghdr *ifm, struct if_msghdr *lim)
618{
619	struct ifa_msghdr *ifam;
620
621	for (ifam = (struct ifa_msghdr *)((char *)ifm + ifm->ifm_msglen);
622	     ifam < (struct ifa_msghdr *)lim;
623	     ifam = (struct ifa_msghdr *)((char *)ifam + ifam->ifam_msglen)) {
624		if (!ifam->ifam_msglen) {
625			syslog(LOG_WARNING,
626			    "<%s> ifa_msglen is 0", __func__);
627			return (NULL);
628		}
629		if (ifam->ifam_type != RTM_NEWADDR)
630			break;
631	}
632
633	return ((struct if_msghdr *)ifam);
634}
635
636int
637getinet6sysctl(int code)
638{
639	int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
640	int value;
641	size_t size;
642
643	mib[3] = code;
644	size = sizeof(value);
645	if (sysctl(mib, nitems(mib), &value, &size, NULL, 0)
646	    < 0) {
647		syslog(LOG_ERR, "<%s>: failed to get ip6 sysctl(%d): %s",
648		    __func__, code,
649		    strerror(errno));
650		return (-1);
651	}
652	else
653		return (value);
654}
655
656
657int
658sock_mc_join(struct sockinfo *s, int ifindex)
659{
660	struct ipv6_mreq mreq;
661	char ifname[IFNAMSIZ];
662
663	syslog(LOG_DEBUG, "<%s> enter", __func__);
664
665	if (ifindex == 0)
666		return (1);
667
668	/*
669	 * join all routers multicast address on each advertising
670	 * interface.
671	 */
672	memset(&mreq, 0, sizeof(mreq));
673	/* XXX */
674	memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
675	    &sin6_linklocal_allrouters.sin6_addr,
676	    sizeof(mreq.ipv6mr_multiaddr.s6_addr));
677
678	mreq.ipv6mr_interface = ifindex;
679	if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
680		sizeof(mreq)) < 0) {
681		syslog(LOG_ERR,
682		    "<%s> IPV6_JOIN_GROUP(link) on %s: %s",
683		    __func__, if_indextoname(ifindex, ifname),
684		    strerror(errno));
685		return (1);
686	}
687	syslog(LOG_DEBUG,
688	    "<%s> %s: join link-local all-routers MC group",
689	    __func__, if_indextoname(ifindex, ifname));
690
691	return (0);
692}
693
694int
695sock_mc_leave(struct sockinfo *s, int ifindex)
696{
697	struct ipv6_mreq mreq;
698	char ifname[IFNAMSIZ];
699
700	syslog(LOG_DEBUG, "<%s> enter", __func__);
701
702	if (ifindex == 0)
703		return (1);
704
705	/*
706	 * join all routers multicast address on each advertising
707	 * interface.
708	 */
709
710	memset(&mreq, 0, sizeof(mreq));
711	/* XXX */
712	memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
713	    &sin6_linklocal_allrouters.sin6_addr,
714	    sizeof(mreq.ipv6mr_multiaddr.s6_addr));
715
716	mreq.ipv6mr_interface = ifindex;
717	if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq,
718		sizeof(mreq)) < 0) {
719		syslog(LOG_ERR,
720		    "<%s> IPV6_JOIN_LEAVE(link) on %s: %s",
721		    __func__, if_indextoname(ifindex, ifname),
722		    strerror(errno));
723		return (1);
724	}
725	syslog(LOG_DEBUG,
726	    "<%s> %s: leave link-local all-routers MC group",
727	    __func__, if_indextoname(ifindex, ifname));
728
729	return (0);
730}
731
732int
733sock_mc_rr_update(struct sockinfo *s, char *mif)
734{
735	struct ipv6_mreq mreq;
736
737	syslog(LOG_DEBUG, "<%s> enter", __func__);
738
739	if (mif == NULL)
740		return (1);
741	/*
742	 * When attending router renumbering, join all-routers site-local
743	 * multicast group.
744	 */
745	/* XXX */
746	memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
747	    &sin6_sitelocal_allrouters.sin6_addr,
748	    sizeof(mreq.ipv6mr_multiaddr.s6_addr));
749	if ((mreq.ipv6mr_interface = if_nametoindex(mif)) == 0) {
750		syslog(LOG_ERR,
751		    "<%s> invalid interface: %s",
752		    __func__, mif);
753		return (1);
754	}
755
756	if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP,
757		&mreq, sizeof(mreq)) < 0) {
758		syslog(LOG_ERR,
759		    "<%s> IPV6_JOIN_GROUP(site) on %s: %s",
760		    __func__, mif, strerror(errno));
761		return (1);
762	}
763
764	syslog(LOG_DEBUG,
765	    "<%s> %s: join site-local all-routers MC group",
766	    __func__, mif);
767
768	return (0);
769}
770