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 <[email protected]>
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
69 struct 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
75 struct 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
81 struct 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
87 struct sockinfo sock = { .si_fd = -1, .si_name = NULL };
88 struct sockinfo rtsock = { .si_fd = -1, .si_name = NULL };
89 struct sockinfo ctrlsock = { .si_fd = -1, .si_name = _PATH_CTRL_SOCK };
90
91 char *mcastif;
92
93 static void get_rtaddrs(int, struct sockaddr *,
94 struct sockaddr **);
95 static struct if_msghdr *get_next_msghdr(struct if_msghdr *,
96 struct if_msghdr *);
97
98 static void
get_rtaddrs(int addrs,struct sockaddr * sa,struct sockaddr ** rti_info)99 get_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))
114 int
lladdropt_length(struct sockaddr_dl * sdl)115 lladdropt_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
127 void
lladdropt_fill(struct sockaddr_dl * sdl,struct nd_opt_hdr * ndopt)128 lladdropt_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
151 int
rtbuf_len(void)152 rtbuf_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))
166 char *
get_next_msg(char * buf,char * lim,int ifindex,size_t * lenp,int filter)167 get_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
260 struct in6_addr *
get_addr(char * buf)261 get_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
272 int
get_rtm_ifindex(char * buf)273 get_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
284 int
get_prefixlen(char * buf)285 get_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
300 int
prefixlen(unsigned char * p,unsigned char * lim)301 prefixlen(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
341 struct ifinfo *
update_persist_ifinfo(struct ifilist_head_t * ifi_head,const char * ifname)342 update_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
382 int
update_ifinfo_nd_flags(struct ifinfo * ifi)383 update_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
413 struct ifinfo *
update_ifinfo(struct ifilist_head_t * ifi_head,int ifindex)414 update_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
619 static struct if_msghdr *
get_next_msghdr(struct if_msghdr * ifm,struct if_msghdr * lim)620 get_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
639 int
getinet6sysctl(int code)640 getinet6sysctl(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
660 int
sock_mc_join(struct sockinfo * s,int ifindex)661 sock_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
697 int
sock_mc_leave(struct sockinfo * s,int ifindex)698 sock_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
735 int
sock_mc_rr_update(struct sockinfo * s,char * mif)736 sock_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