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