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
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 case IFT_L2VLAN:
119 case IFT_BRIDGE:
120 return (ROUNDUP8(ETHER_ADDR_LEN + 2));
121 default:
122 return (0);
123 }
124 }
125
126 void
lladdropt_fill(struct sockaddr_dl * sdl,struct nd_opt_hdr * ndopt)127 lladdropt_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 return;
148 }
149
150 int
rtbuf_len(void)151 rtbuf_len(void)
152 {
153 size_t len;
154 int mib[6] = {CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0};
155
156 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
157 return (-1);
158
159 return (len);
160 }
161
162 #define FILTER_MATCH(type, filter) ((0x1 << type) & filter)
163 #define SIN6(s) ((struct sockaddr_in6 *)(s))
164 #define SDL(s) ((struct sockaddr_dl *)(s))
165 char *
get_next_msg(char * buf,char * lim,int ifindex,size_t * lenp,int filter)166 get_next_msg(char *buf, char *lim, int ifindex, size_t *lenp, int filter)
167 {
168 struct rt_msghdr *rtm;
169 struct ifa_msghdr *ifam;
170 struct sockaddr *sa, *dst, *gw, *ifa, *rti_info[RTAX_MAX];
171
172 *lenp = 0;
173 for (rtm = (struct rt_msghdr *)buf;
174 rtm < (struct rt_msghdr *)lim;
175 rtm = (struct rt_msghdr *)(((char *)rtm) + rtm->rtm_msglen)) {
176 /* just for safety */
177 if (!rtm->rtm_msglen) {
178 syslog(LOG_WARNING, "<%s> rtm_msglen is 0 "
179 "(buf=%p lim=%p rtm=%p)", __func__,
180 buf, lim, rtm);
181 break;
182 }
183 if (((struct rt_msghdr *)buf)->rtm_version != RTM_VERSION) {
184 syslog(LOG_WARNING,
185 "<%s> routing message version mismatch "
186 "(buf=%p lim=%p rtm=%p)", __func__,
187 buf, lim, rtm);
188 continue;
189 }
190
191 if (FILTER_MATCH(rtm->rtm_type, filter) == 0)
192 continue;
193
194 switch (rtm->rtm_type) {
195 case RTM_GET:
196 case RTM_ADD:
197 case RTM_DELETE:
198 /* address related checks */
199 sa = (struct sockaddr *)(rtm + 1);
200 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
201 if ((dst = rti_info[RTAX_DST]) == NULL ||
202 dst->sa_family != AF_INET6)
203 continue;
204
205 if (IN6_IS_ADDR_LINKLOCAL(&SIN6(dst)->sin6_addr) ||
206 IN6_IS_ADDR_MULTICAST(&SIN6(dst)->sin6_addr))
207 continue;
208
209 if ((gw = rti_info[RTAX_GATEWAY]) == NULL ||
210 gw->sa_family != AF_LINK)
211 continue;
212 if (ifindex && SDL(gw)->sdl_index != ifindex)
213 continue;
214
215 if (rti_info[RTAX_NETMASK] == NULL)
216 continue;
217
218 /* found */
219 *lenp = rtm->rtm_msglen;
220 return (char *)rtm;
221 /* NOTREACHED */
222 case RTM_NEWADDR:
223 case RTM_DELADDR:
224 ifam = (struct ifa_msghdr *)rtm;
225
226 /* address related checks */
227 sa = (struct sockaddr *)(ifam + 1);
228 get_rtaddrs(ifam->ifam_addrs, sa, rti_info);
229 if ((ifa = rti_info[RTAX_IFA]) == NULL ||
230 (ifa->sa_family != AF_INET &&
231 ifa->sa_family != AF_INET6))
232 continue;
233
234 if (ifa->sa_family == AF_INET6 &&
235 (IN6_IS_ADDR_LINKLOCAL(&SIN6(ifa)->sin6_addr) ||
236 IN6_IS_ADDR_MULTICAST(&SIN6(ifa)->sin6_addr)))
237 continue;
238
239 if (ifindex && ifam->ifam_index != ifindex)
240 continue;
241
242 /* found */
243 *lenp = ifam->ifam_msglen;
244 return (char *)rtm;
245 /* NOTREACHED */
246 case RTM_IFINFO:
247 case RTM_IFANNOUNCE:
248 /* found */
249 *lenp = rtm->rtm_msglen;
250 return (char *)rtm;
251 /* NOTREACHED */
252 }
253 }
254
255 return ((char *)rtm);
256 }
257 #undef FILTER_MATCH
258
259 struct in6_addr *
get_addr(char * buf)260 get_addr(char *buf)
261 {
262 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
263 struct sockaddr *sa, *rti_info[RTAX_MAX];
264
265 sa = (struct sockaddr *)(rtm + 1);
266 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
267
268 return (&SIN6(rti_info[RTAX_DST])->sin6_addr);
269 }
270
271 int
get_rtm_ifindex(char * buf)272 get_rtm_ifindex(char *buf)
273 {
274 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
275 struct sockaddr *sa, *rti_info[RTAX_MAX];
276
277 sa = (struct sockaddr *)(rtm + 1);
278 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
279
280 return (((struct sockaddr_dl *)rti_info[RTAX_GATEWAY])->sdl_index);
281 }
282
283 int
get_prefixlen(char * buf)284 get_prefixlen(char *buf)
285 {
286 struct rt_msghdr *rtm = (struct rt_msghdr *)buf;
287 struct sockaddr *sa, *rti_info[RTAX_MAX];
288 char *p, *lim;
289
290 sa = (struct sockaddr *)(rtm + 1);
291 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
292 sa = rti_info[RTAX_NETMASK];
293
294 p = (char *)(&SIN6(sa)->sin6_addr);
295 lim = (char *)sa + sa->sa_len;
296 return prefixlen(p, lim);
297 }
298
299 int
prefixlen(unsigned char * p,unsigned char * lim)300 prefixlen(unsigned char *p, unsigned char *lim)
301 {
302 int masklen;
303
304 for (masklen = 0; p < lim; p++) {
305 switch (*p) {
306 case 0xff:
307 masklen += 8;
308 break;
309 case 0xfe:
310 masklen += 7;
311 break;
312 case 0xfc:
313 masklen += 6;
314 break;
315 case 0xf8:
316 masklen += 5;
317 break;
318 case 0xf0:
319 masklen += 4;
320 break;
321 case 0xe0:
322 masklen += 3;
323 break;
324 case 0xc0:
325 masklen += 2;
326 break;
327 case 0x80:
328 masklen += 1;
329 break;
330 case 0x00:
331 break;
332 default:
333 return (-1);
334 }
335 }
336
337 return (masklen);
338 }
339
340 struct ifinfo *
update_persist_ifinfo(struct ifilist_head_t * ifi_head,const char * ifname)341 update_persist_ifinfo(struct ifilist_head_t *ifi_head, const char *ifname)
342 {
343 struct ifinfo *ifi;
344 int ifindex;
345
346 ifi = NULL;
347 ifindex = if_nametoindex(ifname);
348 TAILQ_FOREACH(ifi, ifi_head, ifi_next) {
349 if (ifindex != 0) {
350 if (ifindex == ifi->ifi_ifindex)
351 break;
352 } else {
353 if (strncmp(ifname, ifi->ifi_ifname,
354 sizeof(ifi->ifi_ifname)) == 0)
355 break;
356 }
357 }
358
359 if (ifi == NULL) {
360 /* A new ifinfo element is needed. */
361 syslog(LOG_DEBUG, "<%s> new entry: %s", __func__,
362 ifname);
363
364 ELM_MALLOC(ifi, exit(1));
365 ifi->ifi_ifindex = 0;
366 strlcpy(ifi->ifi_ifname, ifname, sizeof(ifi->ifi_ifname));
367 ifi->ifi_rainfo = NULL;
368 ifi->ifi_state = IFI_STATE_UNCONFIGURED;
369 TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next);
370 }
371
372 ifi->ifi_persist = 1;
373
374 syslog(LOG_DEBUG, "<%s> %s is marked PERSIST", __func__,
375 ifi->ifi_ifname);
376 syslog(LOG_DEBUG, "<%s> %s is state = %d", __func__,
377 ifi->ifi_ifname, ifi->ifi_state);
378 return (ifi);
379 }
380
381 int
update_ifinfo_nd_flags(struct ifinfo * ifi)382 update_ifinfo_nd_flags(struct ifinfo *ifi)
383 {
384 struct in6_ndireq nd;
385 int s;
386 int error;
387
388 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
389 syslog(LOG_ERR,
390 "<%s> socket() failed.", __func__);
391 return (1);
392 }
393 /* ND flags */
394 memset(&nd, 0, sizeof(nd));
395 strlcpy(nd.ifname, ifi->ifi_ifname,
396 sizeof(nd.ifname));
397 error = ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd);
398 if (error) {
399 close(s);
400 if (errno != EPFNOSUPPORT)
401 syslog(LOG_ERR, "<%s> ioctl() failed.", __func__);
402 return (1);
403 }
404 ifi->ifi_nd_flags = nd.ndi.flags;
405 close(s);
406
407 return (0);
408 }
409
410 #define MAX_SYSCTL_TRY 5
411
412 struct ifinfo *
update_ifinfo(struct ifilist_head_t * ifi_head,int ifindex)413 update_ifinfo(struct ifilist_head_t *ifi_head, int ifindex)
414 {
415 struct if_msghdr *ifm;
416 struct ifinfo *ifi = NULL;
417 struct sockaddr *sa;
418 struct sockaddr *rti_info[RTAX_MAX];
419 char *msg;
420 size_t len;
421 char *lim;
422 int mib[] = { CTL_NET, PF_ROUTE, 0, AF_INET6, NET_RT_IFLIST, 0 };
423 int error, ntry;
424
425 syslog(LOG_DEBUG, "<%s> enter", __func__);
426
427 ntry = 0;
428 do {
429 /*
430 * We'll try to get addresses several times in case that
431 * the number of addresses is unexpectedly increased during
432 * the two sysctl calls. This should rarely happen.
433 * Portability note: since FreeBSD does not add margin of
434 * memory at the first sysctl, the possibility of failure on
435 * the second sysctl call is a bit higher.
436 */
437
438 if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) < 0) {
439 syslog(LOG_ERR,
440 "<%s> sysctl: NET_RT_IFLIST size get failed",
441 __func__);
442 exit(1);
443 }
444 if ((msg = malloc(len)) == NULL) {
445 syslog(LOG_ERR, "<%s> malloc failed", __func__);
446 exit(1);
447 }
448 if (sysctl(mib, nitems(mib), msg, &len, NULL, 0) < 0) {
449 if (errno != ENOMEM || ++ntry >= MAX_SYSCTL_TRY) {
450 free(msg);
451 syslog(LOG_ERR,
452 "<%s> sysctl: NET_RT_IFLIST get failed",
453 __func__);
454 exit(1);
455 }
456 free(msg);
457 msg = NULL;
458 }
459 } while (msg == NULL);
460
461 lim = msg + len;
462 for (ifm = (struct if_msghdr *)msg;
463 ifm != NULL && ifm < (struct if_msghdr *)lim;
464 ifm = get_next_msghdr(ifm,(struct if_msghdr *)lim)) {
465 int ifi_new;
466
467 syslog(LOG_DEBUG, "<%s> ifm = %p, lim = %p, diff = %zu",
468 __func__, ifm, lim, (char *)lim - (char *)ifm);
469
470 if (ifm->ifm_version != RTM_VERSION) {
471 syslog(LOG_ERR,
472 "<%s> ifm_vesrion mismatch", __func__);
473 exit(1);
474 }
475 if (ifm->ifm_msglen == 0) {
476 syslog(LOG_WARNING,
477 "<%s> ifm_msglen is 0", __func__);
478 free(msg);
479 return (NULL);
480 }
481
482 ifi_new = 0;
483 if (ifm->ifm_type == RTM_IFINFO) {
484 struct ifreq ifr;
485 int s;
486 char ifname[IFNAMSIZ];
487
488 syslog(LOG_DEBUG, "<%s> RTM_IFINFO found. "
489 "ifm_index = %d, ifindex = %d",
490 __func__, ifm->ifm_index, ifindex);
491
492 /* when ifindex is specified */
493 if (ifindex != UPDATE_IFINFO_ALL &&
494 ifindex != ifm->ifm_index)
495 continue;
496
497 /* ifname */
498 if (if_indextoname(ifm->ifm_index, ifname) == NULL) {
499 syslog(LOG_WARNING,
500 "<%s> ifname not found (idx=%d)",
501 __func__, ifm->ifm_index);
502 continue;
503 }
504
505 /* lookup an entry with the same ifindex */
506 TAILQ_FOREACH(ifi, ifi_head, ifi_next) {
507 if (ifm->ifm_index == ifi->ifi_ifindex)
508 break;
509 if (strncmp(ifname, ifi->ifi_ifname,
510 sizeof(ifname)) == 0)
511 break;
512 }
513 if (ifi == NULL) {
514 syslog(LOG_DEBUG,
515 "<%s> new entry for idx=%d",
516 __func__, ifm->ifm_index);
517 ELM_MALLOC(ifi, exit(1));
518 ifi->ifi_rainfo = NULL;
519 ifi->ifi_state = IFI_STATE_UNCONFIGURED;
520 ifi->ifi_persist = 0;
521 ifi_new = 1;
522 }
523 /* ifindex */
524 ifi->ifi_ifindex = ifm->ifm_index;
525
526 /* ifname */
527 strlcpy(ifi->ifi_ifname, ifname, IFNAMSIZ);
528
529 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
530 syslog(LOG_ERR,
531 "<%s> socket() failed.", __func__);
532 if (ifi_new)
533 free(ifi);
534 continue;
535 }
536
537 /* MTU */
538 ifi->ifi_phymtu = ifm->ifm_data.ifi_mtu;
539 if (ifi->ifi_phymtu == 0) {
540 memset(&ifr, 0, sizeof(ifr));
541 ifr.ifr_addr.sa_family = AF_INET6;
542 strlcpy(ifr.ifr_name, ifi->ifi_ifname,
543 sizeof(ifr.ifr_name));
544 error = ioctl(s, SIOCGIFMTU, (caddr_t)&ifr);
545 if (error) {
546 close(s);
547 syslog(LOG_ERR,
548 "<%s> ioctl() failed.",
549 __func__);
550 if (ifi_new)
551 free(ifi);
552 continue;
553 }
554 ifi->ifi_phymtu = ifr.ifr_mtu;
555 if (ifi->ifi_phymtu == 0) {
556 syslog(LOG_WARNING,
557 "<%s> no interface mtu info"
558 " on %s. %d will be used.",
559 __func__, ifi->ifi_ifname,
560 IPV6_MMTU);
561 ifi->ifi_phymtu = IPV6_MMTU;
562 }
563 }
564 close(s);
565
566 /* ND flags */
567 error = update_ifinfo_nd_flags(ifi);
568 if (error) {
569 if (ifi_new)
570 free(ifi);
571 continue;
572 }
573
574 /* SDL */
575 sa = (struct sockaddr *)(ifm + 1);
576 get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
577 if ((sa = rti_info[RTAX_IFP]) != NULL) {
578 if (sa->sa_family == AF_LINK) {
579 memcpy(&ifi->ifi_sdl,
580 (struct sockaddr_dl *)sa,
581 sizeof(ifi->ifi_sdl));
582 }
583 } else
584 memset(&ifi->ifi_sdl, 0,
585 sizeof(ifi->ifi_sdl));
586
587 /* flags */
588 ifi->ifi_flags = ifm->ifm_flags;
589
590 /* type */
591 ifi->ifi_type = ifm->ifm_type;
592 } else {
593 syslog(LOG_ERR,
594 "out of sync parsing NET_RT_IFLIST\n"
595 "expected %d, got %d\n msglen = %d\n",
596 RTM_IFINFO, ifm->ifm_type, ifm->ifm_msglen);
597 exit(1);
598 }
599
600 if (ifi_new) {
601 syslog(LOG_DEBUG,
602 "<%s> adding %s(idx=%d) to ifilist",
603 __func__, ifi->ifi_ifname, ifi->ifi_ifindex);
604 TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next);
605 }
606 }
607 free(msg);
608
609 if (mcastif != NULL) {
610 error = sock_mc_rr_update(&sock, mcastif);
611 if (error)
612 exit(1);
613 }
614
615 return (ifi);
616 }
617
618 static struct if_msghdr *
get_next_msghdr(struct if_msghdr * ifm,struct if_msghdr * lim)619 get_next_msghdr(struct if_msghdr *ifm, struct if_msghdr *lim)
620 {
621 struct ifa_msghdr *ifam;
622
623 for (ifam = (struct ifa_msghdr *)((char *)ifm + ifm->ifm_msglen);
624 ifam < (struct ifa_msghdr *)lim;
625 ifam = (struct ifa_msghdr *)((char *)ifam + ifam->ifam_msglen)) {
626 if (!ifam->ifam_msglen) {
627 syslog(LOG_WARNING,
628 "<%s> ifa_msglen is 0", __func__);
629 return (NULL);
630 }
631 if (ifam->ifam_type != RTM_NEWADDR)
632 break;
633 }
634
635 return ((struct if_msghdr *)ifam);
636 }
637
638 int
getinet6sysctl(int code)639 getinet6sysctl(int code)
640 {
641 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
642 int value;
643 size_t size;
644
645 mib[3] = code;
646 size = sizeof(value);
647 if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0)
648 < 0) {
649 syslog(LOG_ERR, "<%s>: failed to get ip6 sysctl(%d): %s",
650 __func__, code,
651 strerror(errno));
652 return (-1);
653 }
654 else
655 return (value);
656 }
657
658
659 int
sock_mc_join(struct sockinfo * s,int ifindex)660 sock_mc_join(struct sockinfo *s, int ifindex)
661 {
662 struct ipv6_mreq mreq;
663 char ifname[IFNAMSIZ];
664
665 syslog(LOG_DEBUG, "<%s> enter", __func__);
666
667 if (ifindex == 0)
668 return (1);
669
670 /*
671 * join all routers multicast address on each advertising
672 * interface.
673 */
674 memset(&mreq, 0, sizeof(mreq));
675 /* XXX */
676 memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
677 &sin6_linklocal_allrouters.sin6_addr,
678 sizeof(mreq.ipv6mr_multiaddr.s6_addr));
679
680 mreq.ipv6mr_interface = ifindex;
681 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
682 sizeof(mreq)) < 0) {
683 syslog(LOG_ERR,
684 "<%s> IPV6_JOIN_GROUP(link) on %s: %s",
685 __func__, if_indextoname(ifindex, ifname),
686 strerror(errno));
687 return (1);
688 }
689 syslog(LOG_DEBUG,
690 "<%s> %s: join link-local all-routers MC group",
691 __func__, if_indextoname(ifindex, ifname));
692
693 return (0);
694 }
695
696 int
sock_mc_leave(struct sockinfo * s,int ifindex)697 sock_mc_leave(struct sockinfo *s, int ifindex)
698 {
699 struct ipv6_mreq mreq;
700 char ifname[IFNAMSIZ];
701
702 syslog(LOG_DEBUG, "<%s> enter", __func__);
703
704 if (ifindex == 0)
705 return (1);
706
707 /*
708 * join all routers multicast address on each advertising
709 * interface.
710 */
711
712 memset(&mreq, 0, sizeof(mreq));
713 /* XXX */
714 memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
715 &sin6_linklocal_allrouters.sin6_addr,
716 sizeof(mreq.ipv6mr_multiaddr.s6_addr));
717
718 mreq.ipv6mr_interface = ifindex;
719 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq,
720 sizeof(mreq)) < 0) {
721 syslog(LOG_ERR,
722 "<%s> IPV6_JOIN_LEAVE(link) on %s: %s",
723 __func__, if_indextoname(ifindex, ifname),
724 strerror(errno));
725 return (1);
726 }
727 syslog(LOG_DEBUG,
728 "<%s> %s: leave link-local all-routers MC group",
729 __func__, if_indextoname(ifindex, ifname));
730
731 return (0);
732 }
733
734 int
sock_mc_rr_update(struct sockinfo * s,char * mif)735 sock_mc_rr_update(struct sockinfo *s, char *mif)
736 {
737 struct ipv6_mreq mreq;
738
739 syslog(LOG_DEBUG, "<%s> enter", __func__);
740
741 if (mif == NULL)
742 return (1);
743 /*
744 * When attending router renumbering, join all-routers site-local
745 * multicast group.
746 */
747 /* XXX */
748 memcpy(&mreq.ipv6mr_multiaddr.s6_addr,
749 &sin6_sitelocal_allrouters.sin6_addr,
750 sizeof(mreq.ipv6mr_multiaddr.s6_addr));
751 if ((mreq.ipv6mr_interface = if_nametoindex(mif)) == 0) {
752 syslog(LOG_ERR,
753 "<%s> invalid interface: %s",
754 __func__, mif);
755 return (1);
756 }
757
758 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP,
759 &mreq, sizeof(mreq)) < 0) {
760 syslog(LOG_ERR,
761 "<%s> IPV6_JOIN_GROUP(site) on %s: %s",
762 __func__, mif, strerror(errno));
763 return (1);
764 }
765
766 syslog(LOG_DEBUG,
767 "<%s> %s: join site-local all-routers MC group",
768 __func__, mif);
769
770 return (0);
771 }
772