if.c revision 330897 
1/*	$FreeBSD: stable/11/usr.sbin/rtadvd/if.c 330897 2018-03-14 03:19:51Z eadler $	*/
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
411struct ifinfo *
412update_ifinfo(struct ifilist_head_t *ifi_head, int ifindex)
413{
414	struct if_msghdr *ifm;
415	struct ifinfo *ifi = NULL;
416	struct sockaddr *sa;
417	struct sockaddr *rti_info[RTAX_MAX];
418	char *msg;
419	size_t len;
420	char *lim;
421	int mib[] = { CTL_NET, PF_ROUTE, 0, AF_INET6, NET_RT_IFLIST, 0 };
422	int error;
423
424	syslog(LOG_DEBUG, "<%s> enter", __func__);
425
426	if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), NULL, &len, NULL, 0) <
427	    0) {
428		syslog(LOG_ERR,
429		    "<%s> sysctl: NET_RT_IFLIST size get failed", __func__);
430		exit(1);
431	}
432	if ((msg = malloc(len)) == NULL) {
433		syslog(LOG_ERR, "<%s> malloc failed", __func__);
434		exit(1);
435	}
436	if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), msg, &len, NULL, 0) <
437	    0) {
438		syslog(LOG_ERR,
439		    "<%s> sysctl: NET_RT_IFLIST get failed", __func__);
440		exit(1);
441	}
442
443	lim = msg + len;
444	for (ifm = (struct if_msghdr *)msg;
445	     ifm != NULL && ifm < (struct if_msghdr *)lim;
446	     ifm = get_next_msghdr(ifm,(struct if_msghdr *)lim)) {
447		int ifi_new;
448
449		syslog(LOG_DEBUG, "<%s> ifm = %p, lim = %p, diff = %zu",
450		    __func__, ifm, lim, (char *)lim - (char *)ifm);
451
452		if (ifm->ifm_version != RTM_VERSION) {
453			syslog(LOG_ERR,
454			    "<%s> ifm_vesrion mismatch", __func__);
455			exit(1);
456		}
457		if (ifm->ifm_msglen == 0) {
458			syslog(LOG_WARNING,
459			    "<%s> ifm_msglen is 0", __func__);
460			free(msg);
461			return (NULL);
462		}
463
464		ifi_new = 0;
465		if (ifm->ifm_type == RTM_IFINFO) {
466			struct ifreq ifr;
467			int s;
468			char ifname[IFNAMSIZ];
469
470			syslog(LOG_DEBUG, "<%s> RTM_IFINFO found. "
471			    "ifm_index = %d, ifindex = %d",
472			    __func__, ifm->ifm_index, ifindex);
473
474			/* when ifindex is specified */
475			if (ifindex != UPDATE_IFINFO_ALL &&
476			    ifindex != ifm->ifm_index)
477				continue;
478
479			/* ifname */
480			if (if_indextoname(ifm->ifm_index, ifname) == NULL) {
481				syslog(LOG_WARNING,
482				    "<%s> ifname not found (idx=%d)",
483				    __func__, ifm->ifm_index);
484				continue;
485			}
486
487			/* lookup an entry with the same ifindex */
488			TAILQ_FOREACH(ifi, ifi_head, ifi_next) {
489				if (ifm->ifm_index == ifi->ifi_ifindex)
490					break;
491				if (strncmp(ifname, ifi->ifi_ifname,
492					sizeof(ifname)) == 0)
493					break;
494			}
495			if (ifi == NULL) {
496				syslog(LOG_DEBUG,
497				    "<%s> new entry for idx=%d",
498				    __func__, ifm->ifm_index);
499				ELM_MALLOC(ifi, exit(1));
500				ifi->ifi_rainfo = NULL;
501				ifi->ifi_state = IFI_STATE_UNCONFIGURED;
502				ifi->ifi_persist = 0;
503				ifi_new = 1;
504			}
505			/* ifindex */
506			ifi->ifi_ifindex = ifm->ifm_index;
507
508			/* ifname */
509			strlcpy(ifi->ifi_ifname, ifname, IFNAMSIZ);
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