1/*	$FreeBSD$	*/
2/*	$KAME: if.c,v 1.17 2001/01/21 15:27:30 itojun Exp $	*/
3
4/*-
5 * SPDX-License-Identifier: BSD-3-Clause
6 *
7 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
8 * Copyright (C) 2011 Hiroki Sato <hrs@FreeBSD.org>
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the project nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/param.h>
37#include <sys/socket.h>
38#include <sys/sysctl.h>
39#include <sys/ioctl.h>
40#include <net/if.h>
41#include <net/if_dl.h>
42#include <net/if_types.h>
43#include <net/ethernet.h>
44#include <net/route.h>
45#include <netinet/in.h>
46#include <netinet/in_var.h>
47#include <netinet/ip6.h>
48#include <netinet/icmp6.h>
49#include <netinet6/nd6.h>
50#include <unistd.h>
51#include <errno.h>
52#include <netdb.h>
53#include <stdlib.h>
54#include <string.h>
55#include <syslog.h>
56
57#include "pathnames.h"
58#include "rtadvd.h"
59#include "if.h"
60
61#define ROUNDUP(a, size)					\
62	(((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
63
64#define	NEXT_SA(ap)							\
65	(ap) = (struct sockaddr *)((caddr_t)(ap) +			\
66	    ((ap)->sa_len ? ROUNDUP((ap)->sa_len, sizeof(u_long)) :	\
67	    sizeof(u_long)))
68
69struct sockaddr_in6 sin6_linklocal_allnodes = {
70        .sin6_len =     sizeof(sin6_linklocal_allnodes),
71        .sin6_family =  AF_INET6,
72        .sin6_addr =    IN6ADDR_LINKLOCAL_ALLNODES_INIT,
73};
74
75struct sockaddr_in6 sin6_linklocal_allrouters = {
76        .sin6_len =     sizeof(sin6_linklocal_allrouters),
77        .sin6_family =  AF_INET6,
78        .sin6_addr =    IN6ADDR_LINKLOCAL_ALLROUTERS_INIT,
79};
80
81struct sockaddr_in6 sin6_sitelocal_allrouters = {
82        .sin6_len =     sizeof(sin6_sitelocal_allrouters),
83        .sin6_family =  AF_INET6,
84        .sin6_addr =    IN6ADDR_SITELOCAL_ALLROUTERS_INIT,
85};
86
87struct sockinfo sock = { .si_fd = -1, .si_name = NULL };
88struct sockinfo rtsock = { .si_fd = -1, .si_name = NULL };
89struct sockinfo ctrlsock = { .si_fd = -1, .si_name = _PATH_CTRL_SOCK };
90
91char *mcastif;
92
93static void		get_rtaddrs(int, struct sockaddr *,
94			    struct sockaddr **);
95static struct if_msghdr	*get_next_msghdr(struct if_msghdr *,
96			    struct if_msghdr *);
97
98static void
99get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
100{
101	int i;
102
103	for (i = 0; i < RTAX_MAX; i++) {
104		if (addrs & (1 << i)) {
105			rti_info[i] = sa;
106			NEXT_SA(sa);
107		}
108		else
109			rti_info[i] = NULL;
110	}
111}
112
113#define ROUNDUP8(a) (1 + (((a) - 1) | 7))
114int
115lladdropt_length(struct sockaddr_dl *sdl)
116{
117	switch (sdl->sdl_type) {
118	case IFT_ETHER:
119	case IFT_L2VLAN:
120	case IFT_BRIDGE:
121		return (ROUNDUP8(ETHER_ADDR_LEN + 2));
122	default:
123		return (0);
124	}
125}
126
127void
128lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
129{
130	char *addr;
131
132	ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
133
134	switch (sdl->sdl_type) {
135	case IFT_ETHER:
136	case IFT_L2VLAN:
137	case IFT_BRIDGE:
138		ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
139		addr = (char *)(ndopt + 1);
140		memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
141		break;
142	default:
143		syslog(LOG_ERR, "<%s> unsupported link type(%d)",
144		    __func__, sdl->sdl_type);
145		exit(1);
146	}
147
148	return;
149}
150
151int
152rtbuf_len(void)
153{
154	size_t len;
155	int mib[6] = {CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0};
156
157	if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
158		return (-1);
159
160	return (len);
161}
162
163#define FILTER_MATCH(type, filter) ((0x1 << type) & filter)
164#define SIN6(s) ((struct sockaddr_in6 *)(s))
165#define SDL(s) ((struct sockaddr_dl *)(s))
166char *
167get_next_msg(char *buf, char *lim, int ifindex, size_t *lenp, int filter)
168{
169	struct rt_msghdr *rtm;
170	struct ifa_msghdr *ifam;
171	struct sockaddr *sa, *dst, *gw, *ifa, *rti_info[RTAX_MAX];
172
173	*lenp = 0;
174	for (rtm = (struct rt_msghdr *)buf;
175	     rtm < (struct rt_msghdr *)lim;
176	     rtm = (struct rt_msghdr *)(((char *)rtm) + rtm->rtm_msglen)) {
177		/* just for safety */
178		if (!rtm->rtm_msglen) {
179			syslog(LOG_WARNING, "<%s> rtm_msglen is 0 "
180			    "(buf=%p lim=%p rtm=%p)", __func__,
181			    buf, lim, rtm);
182			break;
183		}
184		if (((struct rt_msghdr *)buf)->rtm_version != RTM_VERSION) {
185			syslog(LOG_WARNING,
186			    "<%s> routing message version mismatch "
187			    "(buf=%p lim=%p rtm=%p)", __func__,
188			    buf, lim, rtm);
189			continue;
190		}
191
192		if (FILTER_MATCH(rtm->rtm_type, filter) == 0)
193			continue;
194
195		switch (rtm->rtm_type) {
196		case RTM_GET:
197		case RTM_ADD:
198		case RTM_DELETE:
199			/* address related checks */
200			sa = (struct sockaddr *)(rtm + 1);
201			get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
202			if ((dst = rti_info[RTAX_DST]) == NULL ||
203			    dst->sa_family != AF_INET6)
204				continue;
205
206			if (IN6_IS_ADDR_LINKLOCAL(&SIN6(dst)->sin6_addr) ||
207			    IN6_IS_ADDR_MULTICAST(&SIN6(dst)->sin6_addr))
208				continue;
209
210			if ((gw = rti_info[RTAX_GATEWAY]) == NULL ||
211			    gw->sa_family != AF_LINK)
212				continue;
213			if (ifindex && SDL(gw)->sdl_index != ifindex)
214				continue;
215
216			if (rti_info[RTAX_NETMASK] == NULL)
217				continue;
218
219			/* found */
220			*lenp = rtm->rtm_msglen;
221			return (char *)rtm;
222			/* NOTREACHED */
223		case RTM_NEWADDR:
224		case RTM_DELADDR:
225			ifam = (struct ifa_msghdr *)rtm;
226
227			/* address related checks */
228			sa = (struct sockaddr *)(ifam + 1);
229			get_rtaddrs(ifam->ifam_addrs, sa, rti_info);
230			if ((ifa = rti_info[RTAX_IFA]) == NULL ||
231			    (ifa->sa_family != AF_INET &&
232			     ifa->sa_family != AF_INET6))
233				continue;
234
235			if (ifa->sa_family == AF_INET6 &&
236			    (IN6_IS_ADDR_LINKLOCAL(&SIN6(ifa)->sin6_addr) ||
237			     IN6_IS_ADDR_MULTICAST(&SIN6(ifa)->sin6_addr)))
238				continue;
239
240			if (ifindex && ifam->ifam_index != ifindex)
241				continue;
242
243			/* found */
244			*lenp = ifam->ifam_msglen;
245			return (char *)rtm;
246			/* NOTREACHED */
247		case RTM_IFINFO:
248		case RTM_IFANNOUNCE:
249			/* found */
250			*lenp = rtm->rtm_msglen;
251			return (char *)rtm;
252			/* NOTREACHED */
253		}
254	}
255
256	return ((char *)rtm);
257}
258#undef FILTER_MATCH
259
260struct in6_addr *
261get_addr(char *buf)
262{
263	struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
264	struct sockaddr *sa, *rti_info[RTAX_MAX];
265
266	sa = (struct sockaddr *)(rtm + 1);
267	get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
268
269	return (&SIN6(rti_info[RTAX_DST])->sin6_addr);
270}
271
272int
273get_rtm_ifindex(char *buf)
274{
275	struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
276	struct sockaddr *sa, *rti_info[RTAX_MAX];
277
278	sa = (struct sockaddr *)(rtm + 1);
279	get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
280
281	return (((struct sockaddr_dl *)rti_info[RTAX_GATEWAY])->sdl_index);
282}
283
284int
285get_prefixlen(char *buf)
286{
287	struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
288	struct sockaddr *sa, *rti_info[RTAX_MAX];
289	char *p, *lim;
290
291	sa = (struct sockaddr *)(rtm + 1);
292	get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
293	sa = rti_info[RTAX_NETMASK];
294
295	p = (char *)(&SIN6(sa)->sin6_addr);
296	lim = (char *)sa + sa->sa_len;
297	return prefixlen(p, lim);
298}
299
300int
301prefixlen(unsigned char *p, unsigned char *lim)
302{
303	int masklen;
304
305	for (masklen = 0; p < lim; p++) {
306		switch (*p) {
307		case 0xff:
308			masklen += 8;
309			break;
310		case 0xfe:
311			masklen += 7;
312			break;
313		case 0xfc:
314			masklen += 6;
315			break;
316		case 0xf8:
317			masklen += 5;
318			break;
319		case 0xf0:
320			masklen += 4;
321			break;
322		case 0xe0:
323			masklen += 3;
324			break;
325		case 0xc0:
326			masklen += 2;
327			break;
328		case 0x80:
329			masklen += 1;
330			break;
331		case 0x00:
332			break;
333		default:
334			return (-1);
335		}
336	}
337
338	return (masklen);
339}
340
341struct ifinfo *
342update_persist_ifinfo(struct ifilist_head_t *ifi_head, const char *ifname)
343{
344	struct ifinfo *ifi;
345	int ifindex;
346
347	ifi = NULL;
348	ifindex = if_nametoindex(ifname);
349	TAILQ_FOREACH(ifi, ifi_head, ifi_next) {
350		if (ifindex != 0) {
351			if (ifindex == ifi->ifi_ifindex)
352				break;
353		} else {
354			if (strncmp(ifname, ifi->ifi_ifname,
355				sizeof(ifi->ifi_ifname)) == 0)
356				break;
357		}
358	}
359
360	if (ifi == NULL) {
361		/* A new ifinfo element is needed. */
362		syslog(LOG_DEBUG, "<%s> new entry: %s", __func__,
363		    ifname);
364
365		ELM_MALLOC(ifi, exit(1));
366		ifi->ifi_ifindex = 0;
367		strlcpy(ifi->ifi_ifname, ifname, sizeof(ifi->ifi_ifname));
368		ifi->ifi_rainfo = NULL;
369		ifi->ifi_state = IFI_STATE_UNCONFIGURED;
370		TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next);
371	}
372
373	ifi->ifi_persist = 1;
374
375	syslog(LOG_DEBUG, "<%s> %s is marked PERSIST", __func__,
376	    ifi->ifi_ifname);
377	syslog(LOG_DEBUG, "<%s> %s is state = %d", __func__,
378	    ifi->ifi_ifname, ifi->ifi_state);
379	return (ifi);
380}
381
382int
383update_ifinfo_nd_flags(struct ifinfo *ifi)
384{
385	struct in6_ndireq nd;
386	int s;
387	int error;
388
389	if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
390		syslog(LOG_ERR,
391		    "<%s> socket() failed.", __func__);
392		return (1);
393	}
394	/* ND flags */
395	memset(&nd, 0, sizeof(nd));
396	strlcpy(nd.ifname, ifi->ifi_ifname,
397	    sizeof(nd.ifname));
398	error = ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd);
399	if (error) {
400		close(s);
401		if (errno != EPFNOSUPPORT)
402			syslog(LOG_ERR, "<%s> ioctl() failed.", __func__);
403		return (1);
404	}
405	ifi->ifi_nd_flags = nd.ndi.flags;
406	close(s);
407
408	return (0);
409}
410
411#define MAX_SYSCTL_TRY 5
412
413struct ifinfo *
414update_ifinfo(struct ifilist_head_t *ifi_head, int ifindex)
415{
416	struct if_msghdr *ifm;
417	struct ifinfo *ifi = NULL;
418	struct sockaddr *sa;
419	struct sockaddr *rti_info[RTAX_MAX];
420	char *msg;
421	size_t len;
422	char *lim;
423	int mib[] = { CTL_NET, PF_ROUTE, 0, AF_INET6, NET_RT_IFLIST, 0 };
424	int error, ntry;
425
426	syslog(LOG_DEBUG, "<%s> enter", __func__);
427
428	ntry = 0;
429	do {
430		/*
431		 * We'll try to get addresses several times in case that
432		 * the number of addresses is unexpectedly increased during
433		 * the two sysctl calls.  This should rarely happen.
434		 * Portability note: since FreeBSD does not add margin of
435		 * memory at the first sysctl, the possibility of failure on
436		 * the second sysctl call is a bit higher.
437		 */
438
439		if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) < 0) {
440			syslog(LOG_ERR,
441			    "<%s> sysctl: NET_RT_IFLIST size get failed",
442			    __func__);
443			exit(1);
444		}
445		if ((msg = malloc(len)) == NULL) {
446			syslog(LOG_ERR, "<%s> malloc failed", __func__);
447			exit(1);
448		}
449		if (sysctl(mib, nitems(mib), msg, &len, NULL, 0) < 0) {
450			if (errno != ENOMEM || ++ntry >= MAX_SYSCTL_TRY) {
451				free(msg);
452				syslog(LOG_ERR,
453				    "<%s> sysctl: NET_RT_IFLIST get failed",
454				    __func__);
455				exit(1);
456			}
457			free(msg);
458			msg = NULL;
459		}
460	} while (msg == NULL);
461
462	lim = msg + len;
463	for (ifm = (struct if_msghdr *)msg;
464	     ifm != NULL && ifm < (struct if_msghdr *)lim;
465	     ifm = get_next_msghdr(ifm,(struct if_msghdr *)lim)) {
466		int ifi_new;
467
468		syslog(LOG_DEBUG, "<%s> ifm = %p, lim = %p, diff = %zu",
469		    __func__, ifm, lim, (char *)lim - (char *)ifm);
470
471		if (ifm->ifm_version != RTM_VERSION) {
472			syslog(LOG_ERR,
473			    "<%s> ifm_vesrion mismatch", __func__);
474			exit(1);
475		}
476		if (ifm->ifm_msglen == 0) {
477			syslog(LOG_WARNING,
478			    "<%s> ifm_msglen is 0", __func__);
479			free(msg);
480			return (NULL);
481		}
482
483		ifi_new = 0;
484		if (ifm->ifm_type == RTM_IFINFO) {
485			struct ifreq ifr;
486			int s;
487			char ifname[IFNAMSIZ];
488
489			syslog(LOG_DEBUG, "<%s> RTM_IFINFO found. "
490			    "ifm_index = %d, ifindex = %d",
491			    __func__, ifm->ifm_index, ifindex);
492
493			/* when ifindex is specified */
494			if (ifindex != UPDATE_IFINFO_ALL &&
495			    ifindex != ifm->ifm_index)
496				continue;
497
498			/* ifname */
499			if (if_indextoname(ifm->ifm_index, ifname) == NULL) {
500				syslog(LOG_WARNING,
501				    "<%s> ifname not found (idx=%d)",
502				    __func__, ifm->ifm_index);
503				continue;
504			}
505
506			/* lookup an entry with the same ifindex */
507			TAILQ_FOREACH(ifi, ifi_head, ifi_next) {
508				if (ifm->ifm_index == ifi->ifi_ifindex)
509					break;
510				if (strncmp(ifname, ifi->ifi_ifname,
511					sizeof(ifname)) == 0)
512					break;
513			}
514			if (ifi == NULL) {
515				syslog(LOG_DEBUG,
516				    "<%s> new entry for idx=%d",
517				    __func__, ifm->ifm_index);
518				ELM_MALLOC(ifi, exit(1));
519				ifi->ifi_rainfo = NULL;
520				ifi->ifi_state = IFI_STATE_UNCONFIGURED;
521				ifi->ifi_persist = 0;
522				ifi_new = 1;
523			}
524			/* ifindex */
525			ifi->ifi_ifindex = ifm->ifm_index;
526
527			/* ifname */
528			strlcpy(ifi->ifi_ifname, ifname, IFNAMSIZ);
529
530			if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
531				syslog(LOG_ERR,
532				    "<%s> socket() failed.", __func__);
533				if (ifi_new)
534					free(ifi);
535				continue;
536			}
537
538			/* MTU  */
539			ifi->ifi_phymtu = ifm->ifm_data.ifi_mtu;
540			if (ifi->ifi_phymtu == 0) {
541				memset(&ifr, 0, sizeof(ifr));
542				ifr.ifr_addr.sa_family = AF_INET6;
543				strlcpy(ifr.ifr_name, ifi->ifi_ifname,
544				    sizeof(ifr.ifr_name));
545				error = ioctl(s, SIOCGIFMTU, (caddr_t)&ifr);
546				if (error) {
547					close(s);
548					syslog(LOG_ERR,
549					    "<%s> ioctl() failed.",
550					    __func__);
551					if (ifi_new)
552						free(ifi);
553					continue;
554				}
555				ifi->ifi_phymtu = ifr.ifr_mtu;
556				if (ifi->ifi_phymtu == 0) {
557					syslog(LOG_WARNING,
558					    "<%s> no interface mtu info"
559					    " on %s.  %d will be used.",
560					    __func__, ifi->ifi_ifname,
561					    IPV6_MMTU);
562					ifi->ifi_phymtu = IPV6_MMTU;
563				}
564			}
565			close(s);
566
567			/* ND flags */
568			error = update_ifinfo_nd_flags(ifi);
569			if (error) {
570				if (ifi_new)
571					free(ifi);
572				continue;
573			}
574
575			/* SDL */
576			sa = (struct sockaddr *)(ifm + 1);
577			get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
578			if ((sa = rti_info[RTAX_IFP]) != NULL) {
579				if (sa->sa_family == AF_LINK) {
580					memcpy(&ifi->ifi_sdl,
581					    (struct sockaddr_dl *)sa,
582					    sizeof(ifi->ifi_sdl));
583				}
584			} else
585				memset(&ifi->ifi_sdl, 0,
586				    sizeof(ifi->ifi_sdl));
587
588			/* flags */
589			ifi->ifi_flags = ifm->ifm_flags;
590
591			/* type */
592			ifi->ifi_type = ifm->ifm_type;
593		} else {
594			syslog(LOG_ERR,
595			    "out of sync parsing NET_RT_IFLIST\n"
596			    "expected %d, got %d\n msglen = %d\n",
597			    RTM_IFINFO, ifm->ifm_type, ifm->ifm_msglen);
598			exit(1);
599		}
600
601		if (ifi_new) {
602			syslog(LOG_DEBUG,
603			    "<%s> adding %s(idx=%d) to ifilist",
604			    __func__, ifi->ifi_ifname, ifi->ifi_ifindex);
605			TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next);
606		}
607	}
608	free(msg);
609
610	if (mcastif != NULL) {
611		error = sock_mc_rr_update(&sock, mcastif);
612		if (error)
613			exit(1);
614	}
615
616	return (ifi);
617}
618
619static struct if_msghdr *
620get_next_msghdr(struct if_msghdr *ifm, struct if_msghdr *lim)
621{
622	struct ifa_msghdr *ifam;
623
624	for (ifam = (struct ifa_msghdr *)((char *)ifm + ifm->ifm_msglen);
625	     ifam < (struct ifa_msghdr *)lim;
626	     ifam = (struct ifa_msghdr *)((char *)ifam + ifam->ifam_msglen)) {
627		if (!ifam->ifam_msglen) {
628			syslog(LOG_WARNING,
629			    "<%s> ifa_msglen is 0", __func__);
630			return (NULL);
631		}
632		if (ifam->ifam_type != RTM_NEWADDR)
633			break;
634	}
635
636	return ((struct if_msghdr *)ifam);
637}
638
639int
640getinet6sysctl(int code)
641{
642	int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
643	int value;
644	size_t size;
645
646	mib[3] = code;
647	size = sizeof(value);
648	if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0)
649	    < 0) {
650		syslog(LOG_ERR, "<%s>: failed to get ip6 sysctl(%d): %s",
651		    __func__, code,
652		    strerror(errno));
653		return (-1);
654	}
655	else
656		return (value);
657}
658
659
660int
661sock_mc_join(struct sockinfo *s, int ifindex)
662{
663	struct ipv6_mreq mreq;
664	char ifname[IFNAMSIZ];
665
666	syslog(LOG_DEBUG, "<%s> enter", __func__);
667
668	if (ifindex == 0)
669		return (1);
670
671	/*
672	 * join all routers multicast address on each advertising
673	 * interface.
674	 */
675	memset(&mreq, 0, sizeof(mreq));
676	/* XXX */
677	memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
678	    &sin6_linklocal_allrouters.sin6_addr,
679	    sizeof(mreq.ipv6mr_multiaddr.s6_addr));
680
681	mreq.ipv6mr_interface = ifindex;
682	if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
683		sizeof(mreq)) < 0) {
684		syslog(LOG_ERR,
685		    "<%s> IPV6_JOIN_GROUP(link) on %s: %s",
686		    __func__, if_indextoname(ifindex, ifname),
687		    strerror(errno));
688		return (1);
689	}
690	syslog(LOG_DEBUG,
691	    "<%s> %s: join link-local all-routers MC group",
692	    __func__, if_indextoname(ifindex, ifname));
693
694	return (0);
695}
696
697int
698sock_mc_leave(struct sockinfo *s, int ifindex)
699{
700	struct ipv6_mreq mreq;
701	char ifname[IFNAMSIZ];
702
703	syslog(LOG_DEBUG, "<%s> enter", __func__);
704
705	if (ifindex == 0)
706		return (1);
707
708	/*
709	 * join all routers multicast address on each advertising
710	 * interface.
711	 */
712
713	memset(&mreq, 0, sizeof(mreq));
714	/* XXX */
715	memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
716	    &sin6_linklocal_allrouters.sin6_addr,
717	    sizeof(mreq.ipv6mr_multiaddr.s6_addr));
718
719	mreq.ipv6mr_interface = ifindex;
720	if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq,
721		sizeof(mreq)) < 0) {
722		syslog(LOG_ERR,
723		    "<%s> IPV6_JOIN_LEAVE(link) on %s: %s",
724		    __func__, if_indextoname(ifindex, ifname),
725		    strerror(errno));
726		return (1);
727	}
728	syslog(LOG_DEBUG,
729	    "<%s> %s: leave link-local all-routers MC group",
730	    __func__, if_indextoname(ifindex, ifname));
731
732	return (0);
733}
734
735int
736sock_mc_rr_update(struct sockinfo *s, char *mif)
737{
738	struct ipv6_mreq mreq;
739
740	syslog(LOG_DEBUG, "<%s> enter", __func__);
741
742	if (mif == NULL)
743		return (1);
744	/*
745	 * When attending router renumbering, join all-routers site-local
746	 * multicast group.
747	 */
748	/* XXX */
749	memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
750	    &sin6_sitelocal_allrouters.sin6_addr,
751	    sizeof(mreq.ipv6mr_multiaddr.s6_addr));
752	if ((mreq.ipv6mr_interface = if_nametoindex(mif)) == 0) {
753		syslog(LOG_ERR,
754		    "<%s> invalid interface: %s",
755		    __func__, mif);
756		return (1);
757	}
758
759	if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP,
760		&mreq, sizeof(mreq)) < 0) {
761		syslog(LOG_ERR,
762		    "<%s> IPV6_JOIN_GROUP(site) on %s: %s",
763		    __func__, mif, strerror(errno));
764		return (1);
765	}
766
767	syslog(LOG_DEBUG,
768	    "<%s> %s: join site-local all-routers MC group",
769	    __func__, mif);
770
771	return (0);
772}
773