1 /* $FreeBSD: stable/10/usr.sbin/rtadvd/if.c 255156 2013-09-02 20:44:19Z 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
68 struct 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
74 struct 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
80 struct 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
86 struct sockinfo sock = { .si_fd = -1, .si_name = NULL };
87 struct sockinfo rtsock = { .si_fd = -1, .si_name = NULL };
88 struct sockinfo ctrlsock = { .si_fd = -1, .si_name = _PATH_CTRL_SOCK };
89
90 char *mcastif;
91
92 static void get_rtaddrs(int, struct sockaddr *,
93 struct sockaddr **);
94 static struct if_msghdr *get_next_msghdr(struct if_msghdr *,
95 struct if_msghdr *);
96
97 static void
get_rtaddrs(int addrs,struct sockaddr * sa,struct sockaddr ** rti_info)98 get_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))
113 int
lladdropt_length(struct sockaddr_dl * sdl)114 lladdropt_length(struct sockaddr_dl *sdl)
115 {
116 switch (sdl->sdl_type) {
117 case IFT_ETHER:
118 return (ROUNDUP8(ETHER_ADDR_LEN + 2));
119 default:
120 return (0);
121 }
122 }
123
124 void
lladdropt_fill(struct sockaddr_dl * sdl,struct nd_opt_hdr * ndopt)125 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
126 {
127 char *addr;
128
129 ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
130
131 switch (sdl->sdl_type) {
132 case IFT_ETHER:
133 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
134 addr = (char *)(ndopt + 1);
135 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
136 break;
137 default:
138 syslog(LOG_ERR, "<%s> unsupported link type(%d)",
139 __func__, sdl->sdl_type);
140 exit(1);
141 }
142
143 return;
144 }
145
146 int
rtbuf_len(void)147 rtbuf_len(void)
148 {
149 size_t len;
150 int mib[6] = {CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0};
151
152 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
153 return (-1);
154
155 return (len);
156 }
157
158 #define FILTER_MATCH(type, filter) ((0x1 << type) & filter)
159 #define SIN6(s) ((struct sockaddr_in6 *)(s))
160 #define SDL(s) ((struct sockaddr_dl *)(s))
161 char *
get_next_msg(char * buf,char * lim,int ifindex,size_t * lenp,int filter)162 get_next_msg(char *buf, char *lim, int ifindex, size_t *lenp, int filter)
163 {
164 struct rt_msghdr *rtm;
165 struct ifa_msghdr *ifam;
166 struct sockaddr *sa, *dst, *gw, *ifa, *rti_info[RTAX_MAX];
167
168 *lenp = 0;
169 for (rtm = (struct rt_msghdr *)buf;
170 rtm < (struct rt_msghdr *)lim;
171 rtm = (struct rt_msghdr *)(((char *)rtm) + rtm->rtm_msglen)) {
172 /* just for safety */
173 if (!rtm->rtm_msglen) {
174 syslog(LOG_WARNING, "<%s> rtm_msglen is 0 "
175 "(buf=%p lim=%p rtm=%p)", __func__,
176 buf, lim, rtm);
177 break;
178 }
179 if (((struct rt_msghdr *)buf)->rtm_version != RTM_VERSION) {
180 syslog(LOG_WARNING,
181 "<%s> routing message version mismatch "
182 "(buf=%p lim=%p rtm=%p)", __func__,
183 buf, lim, rtm);
184 continue;
185 }
186
187 if (FILTER_MATCH(rtm->rtm_type, filter) == 0)
188 continue;
189
190 switch (rtm->rtm_type) {
191 case RTM_GET:
192 case RTM_ADD:
193 case RTM_DELETE:
194 /* address related checks */
195 sa = (struct sockaddr *)(rtm + 1);
196 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
197 if ((dst = rti_info[RTAX_DST]) == NULL ||
198 dst->sa_family != AF_INET6)
199 continue;
200
201 if (IN6_IS_ADDR_LINKLOCAL(&SIN6(dst)->sin6_addr) ||
202 IN6_IS_ADDR_MULTICAST(&SIN6(dst)->sin6_addr))
203 continue;
204
205 if ((gw = rti_info[RTAX_GATEWAY]) == NULL ||
206 gw->sa_family != AF_LINK)
207 continue;
208 if (ifindex && SDL(gw)->sdl_index != ifindex)
209 continue;
210
211 if (rti_info[RTAX_NETMASK] == NULL)
212 continue;
213
214 /* found */
215 *lenp = rtm->rtm_msglen;
216 return (char *)rtm;
217 /* NOTREACHED */
218 case RTM_NEWADDR:
219 case RTM_DELADDR:
220 ifam = (struct ifa_msghdr *)rtm;
221
222 /* address related checks */
223 sa = (struct sockaddr *)(ifam + 1);
224 get_rtaddrs(ifam->ifam_addrs, sa, rti_info);
225 if ((ifa = rti_info[RTAX_IFA]) == NULL ||
226 (ifa->sa_family != AF_INET &&
227 ifa->sa_family != AF_INET6))
228 continue;
229
230 if (ifa->sa_family == AF_INET6 &&
231 (IN6_IS_ADDR_LINKLOCAL(&SIN6(ifa)->sin6_addr) ||
232 IN6_IS_ADDR_MULTICAST(&SIN6(ifa)->sin6_addr)))
233 continue;
234
235 if (ifindex && ifam->ifam_index != ifindex)
236 continue;
237
238 /* found */
239 *lenp = ifam->ifam_msglen;
240 return (char *)rtm;
241 /* NOTREACHED */
242 case RTM_IFINFO:
243 case RTM_IFANNOUNCE:
244 /* found */
245 *lenp = rtm->rtm_msglen;
246 return (char *)rtm;
247 /* NOTREACHED */
248 }
249 }
250
251 return ((char *)rtm);
252 }
253 #undef FILTER_MATCH
254
255 struct in6_addr *
get_addr(char * buf)256 get_addr(char *buf)
257 {
258 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
259 struct sockaddr *sa, *rti_info[RTAX_MAX];
260
261 sa = (struct sockaddr *)(rtm + 1);
262 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
263
264 return (&SIN6(rti_info[RTAX_DST])->sin6_addr);
265 }
266
267 int
get_rtm_ifindex(char * buf)268 get_rtm_ifindex(char *buf)
269 {
270 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
271 struct sockaddr *sa, *rti_info[RTAX_MAX];
272
273 sa = (struct sockaddr *)(rtm + 1);
274 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
275
276 return (((struct sockaddr_dl *)rti_info[RTAX_GATEWAY])->sdl_index);
277 }
278
279 int
get_prefixlen(char * buf)280 get_prefixlen(char *buf)
281 {
282 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
283 struct sockaddr *sa, *rti_info[RTAX_MAX];
284 char *p, *lim;
285
286 sa = (struct sockaddr *)(rtm + 1);
287 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
288 sa = rti_info[RTAX_NETMASK];
289
290 p = (char *)(&SIN6(sa)->sin6_addr);
291 lim = (char *)sa + sa->sa_len;
292 return prefixlen(p, lim);
293 }
294
295 int
prefixlen(unsigned char * p,unsigned char * lim)296 prefixlen(unsigned char *p, unsigned char *lim)
297 {
298 int masklen;
299
300 for (masklen = 0; p < lim; p++) {
301 switch (*p) {
302 case 0xff:
303 masklen += 8;
304 break;
305 case 0xfe:
306 masklen += 7;
307 break;
308 case 0xfc:
309 masklen += 6;
310 break;
311 case 0xf8:
312 masklen += 5;
313 break;
314 case 0xf0:
315 masklen += 4;
316 break;
317 case 0xe0:
318 masklen += 3;
319 break;
320 case 0xc0:
321 masklen += 2;
322 break;
323 case 0x80:
324 masklen += 1;
325 break;
326 case 0x00:
327 break;
328 default:
329 return (-1);
330 }
331 }
332
333 return (masklen);
334 }
335
336 struct ifinfo *
update_persist_ifinfo(struct ifilist_head_t * ifi_head,const char * ifname)337 update_persist_ifinfo(struct ifilist_head_t *ifi_head, const char *ifname)
338 {
339 struct ifinfo *ifi;
340 int ifindex;
341
342 ifi = NULL;
343 ifindex = if_nametoindex(ifname);
344 TAILQ_FOREACH(ifi, ifi_head, ifi_next) {
345 if (ifindex != 0) {
346 if (ifindex == ifi->ifi_ifindex)
347 break;
348 } else {
349 if (strncmp(ifname, ifi->ifi_ifname,
350 sizeof(ifi->ifi_ifname)) == 0)
351 break;
352 }
353 }
354
355 if (ifi == NULL) {
356 /* A new ifinfo element is needed. */
357 syslog(LOG_DEBUG, "<%s> new entry: %s", __func__,
358 ifname);
359
360 ELM_MALLOC(ifi, exit(1));
361 ifi->ifi_ifindex = 0;
362 strncpy(ifi->ifi_ifname, ifname, sizeof(ifi->ifi_ifname)-1);
363 ifi->ifi_ifname[sizeof(ifi->ifi_ifname)-1] = '\0';
364 ifi->ifi_rainfo = NULL;
365 ifi->ifi_state = IFI_STATE_UNCONFIGURED;
366 TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next);
367 }
368
369 ifi->ifi_persist = 1;
370
371 syslog(LOG_DEBUG, "<%s> %s is marked PERSIST", __func__,
372 ifi->ifi_ifname);
373 syslog(LOG_DEBUG, "<%s> %s is state = %d", __func__,
374 ifi->ifi_ifname, ifi->ifi_state);
375 return (ifi);
376 }
377
378 int
update_ifinfo_nd_flags(struct ifinfo * ifi)379 update_ifinfo_nd_flags(struct ifinfo *ifi)
380 {
381 struct in6_ndireq nd;
382 int s;
383 int error;
384
385 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
386 syslog(LOG_ERR,
387 "<%s> socket() failed.", __func__);
388 return (1);
389 }
390 /* ND flags */
391 memset(&nd, 0, sizeof(nd));
392 strncpy(nd.ifname, ifi->ifi_ifname,
393 sizeof(nd.ifname));
394 error = ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd);
395 if (error) {
396 close(s);
397 if (errno != EPFNOSUPPORT)
398 syslog(LOG_ERR, "<%s> ioctl() failed.", __func__);
399 return (1);
400 }
401 ifi->ifi_nd_flags = nd.ndi.flags;
402 close(s);
403
404 return (0);
405 }
406
407 struct ifinfo *
update_ifinfo(struct ifilist_head_t * ifi_head,int ifindex)408 update_ifinfo(struct ifilist_head_t *ifi_head, int ifindex)
409 {
410 struct if_msghdr *ifm;
411 struct ifinfo *ifi = NULL;
412 struct sockaddr *sa;
413 struct sockaddr *rti_info[RTAX_MAX];
414 char *msg;
415 size_t len;
416 char *lim;
417 int mib[] = { CTL_NET, PF_ROUTE, 0, AF_INET6, NET_RT_IFLIST, 0 };
418 int error;
419
420 syslog(LOG_DEBUG, "<%s> enter", __func__);
421
422 if (sysctl(mib, NELEM(mib), NULL, &len, NULL, 0) <
423 0) {
424 syslog(LOG_ERR,
425 "<%s> sysctl: NET_RT_IFLIST size get failed", __func__);
426 exit(1);
427 }
428 if ((msg = malloc(len)) == NULL) {
429 syslog(LOG_ERR, "<%s> malloc failed", __func__);
430 exit(1);
431 }
432 if (sysctl(mib, NELEM(mib), msg, &len, NULL, 0) <
433 0) {
434 syslog(LOG_ERR,
435 "<%s> sysctl: NET_RT_IFLIST get failed", __func__);
436 exit(1);
437 }
438
439 lim = msg + len;
440 for (ifm = (struct if_msghdr *)msg;
441 ifm != NULL && ifm < (struct if_msghdr *)lim;
442 ifm = get_next_msghdr(ifm,(struct if_msghdr *)lim)) {
443 int ifi_new;
444
445 syslog(LOG_DEBUG, "<%s> ifm = %p, lim = %p, diff = %zu",
446 __func__, ifm, lim, (char *)lim - (char *)ifm);
447
448 if (ifm->ifm_version != RTM_VERSION) {
449 syslog(LOG_ERR,
450 "<%s> ifm_vesrion mismatch", __func__);
451 exit(1);
452 }
453 if (ifm->ifm_msglen == 0) {
454 syslog(LOG_WARNING,
455 "<%s> ifm_msglen is 0", __func__);
456 free(msg);
457 return (NULL);
458 }
459
460 ifi_new = 0;
461 if (ifm->ifm_type == RTM_IFINFO) {
462 struct ifreq ifr;
463 int s;
464 char ifname[IFNAMSIZ];
465
466 syslog(LOG_DEBUG, "<%s> RTM_IFINFO found. "
467 "ifm_index = %d, ifindex = %d",
468 __func__, ifm->ifm_index, ifindex);
469
470 /* when ifindex is specified */
471 if (ifindex != UPDATE_IFINFO_ALL &&
472 ifindex != ifm->ifm_index)
473 continue;
474
475 /* lookup an entry with the same ifindex */
476 TAILQ_FOREACH(ifi, ifi_head, ifi_next) {
477 if (ifm->ifm_index == ifi->ifi_ifindex)
478 break;
479 if_indextoname(ifm->ifm_index, ifname);
480 if (strncmp(ifname, ifi->ifi_ifname,
481 sizeof(ifname)) == 0)
482 break;
483 }
484 if (ifi == NULL) {
485 syslog(LOG_DEBUG,
486 "<%s> new entry for idx=%d",
487 __func__, ifm->ifm_index);
488 ELM_MALLOC(ifi, exit(1));
489 ifi->ifi_rainfo = NULL;
490 ifi->ifi_state = IFI_STATE_UNCONFIGURED;
491 ifi->ifi_persist = 0;
492 ifi_new = 1;
493 }
494 /* ifindex */
495 ifi->ifi_ifindex = ifm->ifm_index;
496
497 /* ifname */
498 if_indextoname(ifm->ifm_index, ifi->ifi_ifname);
499 if (ifi->ifi_ifname == NULL) {
500 syslog(LOG_WARNING,
501 "<%s> ifname not found (idx=%d)",
502 __func__, ifm->ifm_index);
503 if (ifi_new)
504 free(ifi);
505 continue;
506 }
507
508 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
509 syslog(LOG_ERR,
510 "<%s> socket() failed.", __func__);
511 if (ifi_new)
512 free(ifi);
513 continue;
514 }
515
516 /* MTU */
517 ifi->ifi_phymtu = ifm->ifm_data.ifi_mtu;
518 if (ifi->ifi_phymtu == 0) {
519 memset(&ifr, 0, sizeof(ifr));
520 ifr.ifr_addr.sa_family = AF_INET6;
521 strncpy(ifr.ifr_name, ifi->ifi_ifname,
522 sizeof(ifr.ifr_name));
523 error = ioctl(s, SIOCGIFMTU, (caddr_t)&ifr);
524 if (error) {
525 close(s);
526 syslog(LOG_ERR,
527 "<%s> ioctl() failed.",
528 __func__);
529 if (ifi_new)
530 free(ifi);
531 continue;
532 }
533 ifi->ifi_phymtu = ifr.ifr_mtu;
534 if (ifi->ifi_phymtu == 0) {
535 syslog(LOG_WARNING,
536 "<%s> no interface mtu info"
537 " on %s. %d will be used.",
538 __func__, ifi->ifi_ifname,
539 IPV6_MMTU);
540 ifi->ifi_phymtu = IPV6_MMTU;
541 }
542 }
543 close(s);
544
545 /* ND flags */
546 error = update_ifinfo_nd_flags(ifi);
547 if (error) {
548 if (ifi_new)
549 free(ifi);
550 continue;
551 }
552
553 /* SDL */
554 sa = (struct sockaddr *)(ifm + 1);
555 get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
556 if ((sa = rti_info[RTAX_IFP]) != NULL) {
557 if (sa->sa_family == AF_LINK) {
558 memcpy(&ifi->ifi_sdl,
559 (struct sockaddr_dl *)sa,
560 sizeof(ifi->ifi_sdl));
561 }
562 } else
563 memset(&ifi->ifi_sdl, 0,
564 sizeof(ifi->ifi_sdl));
565
566 /* flags */
567 ifi->ifi_flags = ifm->ifm_flags;
568
569 /* type */
570 ifi->ifi_type = ifm->ifm_type;
571 } else {
572 syslog(LOG_ERR,
573 "out of sync parsing NET_RT_IFLIST\n"
574 "expected %d, got %d\n msglen = %d\n",
575 RTM_IFINFO, ifm->ifm_type, ifm->ifm_msglen);
576 exit(1);
577 }
578
579 if (ifi_new) {
580 syslog(LOG_DEBUG,
581 "<%s> adding %s(idx=%d) to ifilist",
582 __func__, ifi->ifi_ifname, ifi->ifi_ifindex);
583 TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next);
584 }
585 }
586 free(msg);
587
588 if (mcastif != NULL) {
589 error = sock_mc_rr_update(&sock, mcastif);
590 if (error)
591 exit(1);
592 }
593
594 return (ifi);
595 }
596
597 static struct if_msghdr *
get_next_msghdr(struct if_msghdr * ifm,struct if_msghdr * lim)598 get_next_msghdr(struct if_msghdr *ifm, struct if_msghdr *lim)
599 {
600 struct ifa_msghdr *ifam;
601
602 for (ifam = (struct ifa_msghdr *)((char *)ifm + ifm->ifm_msglen);
603 ifam < (struct ifa_msghdr *)lim;
604 ifam = (struct ifa_msghdr *)((char *)ifam + ifam->ifam_msglen)) {
605 if (!ifam->ifam_msglen) {
606 syslog(LOG_WARNING,
607 "<%s> ifa_msglen is 0", __func__);
608 return (NULL);
609 }
610 if (ifam->ifam_type != RTM_NEWADDR)
611 break;
612 }
613
614 return ((struct if_msghdr *)ifam);
615 }
616
617 int
getinet6sysctl(int code)618 getinet6sysctl(int code)
619 {
620 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
621 int value;
622 size_t size;
623
624 mib[3] = code;
625 size = sizeof(value);
626 if (sysctl(mib, NELEM(mib), &value, &size, NULL, 0)
627 < 0) {
628 syslog(LOG_ERR, "<%s>: failed to get ip6 sysctl(%d): %s",
629 __func__, code,
630 strerror(errno));
631 return (-1);
632 }
633 else
634 return (value);
635 }
636
637
638 int
sock_mc_join(struct sockinfo * s,int ifindex)639 sock_mc_join(struct sockinfo *s, int ifindex)
640 {
641 struct ipv6_mreq mreq;
642 char ifname[IFNAMSIZ];
643
644 syslog(LOG_DEBUG, "<%s> enter", __func__);
645
646 if (ifindex == 0)
647 return (1);
648
649 /*
650 * join all routers multicast address on each advertising
651 * interface.
652 */
653 memset(&mreq, 0, sizeof(mreq));
654 /* XXX */
655 memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
656 &sin6_linklocal_allrouters.sin6_addr,
657 sizeof(mreq.ipv6mr_multiaddr.s6_addr));
658
659 mreq.ipv6mr_interface = ifindex;
660 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
661 sizeof(mreq)) < 0) {
662 syslog(LOG_ERR,
663 "<%s> IPV6_JOIN_GROUP(link) on %s: %s",
664 __func__, if_indextoname(ifindex, ifname),
665 strerror(errno));
666 return (1);
667 }
668 syslog(LOG_DEBUG,
669 "<%s> %s: join link-local all-routers MC group",
670 __func__, if_indextoname(ifindex, ifname));
671
672 return (0);
673 }
674
675 int
sock_mc_leave(struct sockinfo * s,int ifindex)676 sock_mc_leave(struct sockinfo *s, int ifindex)
677 {
678 struct ipv6_mreq mreq;
679 char ifname[IFNAMSIZ];
680
681 syslog(LOG_DEBUG, "<%s> enter", __func__);
682
683 if (ifindex == 0)
684 return (1);
685
686 /*
687 * join all routers multicast address on each advertising
688 * interface.
689 */
690
691 memset(&mreq, 0, sizeof(mreq));
692 /* XXX */
693 memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
694 &sin6_linklocal_allrouters.sin6_addr,
695 sizeof(mreq.ipv6mr_multiaddr.s6_addr));
696
697 mreq.ipv6mr_interface = ifindex;
698 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq,
699 sizeof(mreq)) < 0) {
700 syslog(LOG_ERR,
701 "<%s> IPV6_JOIN_LEAVE(link) on %s: %s",
702 __func__, if_indextoname(ifindex, ifname),
703 strerror(errno));
704 return (1);
705 }
706 syslog(LOG_DEBUG,
707 "<%s> %s: leave link-local all-routers MC group",
708 __func__, if_indextoname(ifindex, ifname));
709
710 return (0);
711 }
712
713 int
sock_mc_rr_update(struct sockinfo * s,char * mif)714 sock_mc_rr_update(struct sockinfo *s, char *mif)
715 {
716 struct ipv6_mreq mreq;
717
718 syslog(LOG_DEBUG, "<%s> enter", __func__);
719
720 if (mif == NULL)
721 return (1);
722 /*
723 * When attending router renumbering, join all-routers site-local
724 * multicast group.
725 */
726 /* XXX */
727 memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
728 &sin6_sitelocal_allrouters.sin6_addr,
729 sizeof(mreq.ipv6mr_multiaddr.s6_addr));
730 if ((mreq.ipv6mr_interface = if_nametoindex(mif)) == 0) {
731 syslog(LOG_ERR,
732 "<%s> invalid interface: %s",
733 __func__, mif);
734 return (1);
735 }
736
737 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP,
738 &mreq, sizeof(mreq)) < 0) {
739 syslog(LOG_ERR,
740 "<%s> IPV6_JOIN_GROUP(site) on %s: %s",
741 __func__, mif, strerror(errno));
742 return (1);
743 }
744
745 syslog(LOG_DEBUG,
746 "<%s> %s: join site-local all-routers MC group",
747 __func__, mif);
748
749 return (0);
750 }
751