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kqueue: Nuke unused code
[dragonfly.git] / usr.sbin / rtadvd / rtadvd.c
blob23c15e5e89591bf2e089ea5b1df35b4ea3ef6e8c
1 /* $FreeBSD: stable/10/usr.sbin/rtadvd/rtadvd.c 275038 2014-11-25 13:12:45Z dim $ */
2 /* $KAME: rtadvd.c,v 1.82 2003/08/05 12:34:23 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/ioctl.h>
36 #include <sys/socket.h>
37 #include <sys/uio.h>
38 #include <sys/queue.h>
39 #include <sys/stat.h>
40 #include <sys/sysctl.h>
41
42 #include <net/if.h>
43 #include <net/if_types.h>
44 #include <net/if_media.h>
45 #include <net/if_dl.h>
46 #include <net/route.h>
47 #include <netinet/in.h>
48 #include <netinet/ip6.h>
49 #include <netinet6/ip6_var.h>
50 #include <netinet/icmp6.h>
51
52 #include <arpa/inet.h>
53
54 #include <net/if_var.h>
55 #include <netinet/in_var.h>
56 #include <netinet6/nd6.h>
57
58 #include <time.h>
59 #include <unistd.h>
60 #include <stdio.h>
61 #include <err.h>
62 #include <errno.h>
63 #include <inttypes.h>
64 #include <libutil.h>
65 #include <netdb.h>
66 #include <signal.h>
67 #include <string.h>
68 #include <stdlib.h>
69 #include <syslog.h>
70 #include <poll.h>
71
72 #include "pathnames.h"
73 #include "rtadvd.h"
74 #include "if.h"
75 #include "rrenum.h"
76 #include "advcap.h"
77 #include "timer_subr.h"
78 #include "timer.h"
79 #include "config.h"
80 #include "control.h"
81 #include "control_server.h"
82
83 #define RTADV_TYPE2BITMASK(type) (0x1 << type)
84
85 struct msghdr rcvmhdr;
86 static char *rcvcmsgbuf;
87 static size_t rcvcmsgbuflen;
88 static char *sndcmsgbuf = NULL;
89 static size_t sndcmsgbuflen;
90 struct msghdr sndmhdr;
91 struct iovec rcviov[2];
92 struct iovec sndiov[2];
93 struct sockaddr_in6 rcvfrom;
94 static const char *pidfilename = _PATH_RTADVDPID;
95 const char *conffile = _PATH_RTADVDCONF;
96 static struct pidfh *pfh;
97 static int dflag, sflag;
98 static int wait_shutdown;
99
100 #define PFD_RAWSOCK 0
101 #define PFD_RTSOCK 1
102 #define PFD_CSOCK 2
103 #define PFD_MAX 3
104
105 struct railist_head_t railist =
106 TAILQ_HEAD_INITIALIZER(railist);
107 struct ifilist_head_t ifilist =
108 TAILQ_HEAD_INITIALIZER(ifilist);
109
110 struct nd_optlist {
111 TAILQ_ENTRY(nd_optlist) nol_next;
112 struct nd_opt_hdr *nol_opt;
113 };
114 union nd_opt {
115 struct nd_opt_hdr *opt_array[9];
116 struct {
117 struct nd_opt_hdr *zero;
118 struct nd_opt_hdr *src_lladdr;
119 struct nd_opt_hdr *tgt_lladdr;
120 struct nd_opt_prefix_info *pi;
121 struct nd_opt_rd_hdr *rh;
122 struct nd_opt_mtu *mtu;
123 TAILQ_HEAD(, nd_optlist) opt_list;
124 } nd_opt_each;
125 };
126 #define opt_src_lladdr nd_opt_each.src_lladdr
127 #define opt_tgt_lladdr nd_opt_each.tgt_lladdr
128 #define opt_pi nd_opt_each.pi
129 #define opt_rh nd_opt_each.rh
130 #define opt_mtu nd_opt_each.mtu
131 #define opt_list nd_opt_each.opt_list
132
133 #define NDOPT_FLAG_SRCLINKADDR (1 << 0)
134 #define NDOPT_FLAG_TGTLINKADDR (1 << 1)
135 #define NDOPT_FLAG_PREFIXINFO (1 << 2)
136 #define NDOPT_FLAG_RDHDR (1 << 3)
137 #define NDOPT_FLAG_MTU (1 << 4)
138 #define NDOPT_FLAG_RDNSS (1 << 5)
139 #define NDOPT_FLAG_DNSSL (1 << 6)
140
141 static uint32_t ndopt_flags[] = {
142 [ND_OPT_SOURCE_LINKADDR] = NDOPT_FLAG_SRCLINKADDR,
143 [ND_OPT_TARGET_LINKADDR] = NDOPT_FLAG_TGTLINKADDR,
144 [ND_OPT_PREFIX_INFORMATION] = NDOPT_FLAG_PREFIXINFO,
145 [ND_OPT_REDIRECTED_HEADER] = NDOPT_FLAG_RDHDR,
146 [ND_OPT_MTU] = NDOPT_FLAG_MTU,
147 [ND_OPT_RDNSS] = NDOPT_FLAG_RDNSS,
148 [ND_OPT_DNSSL] = NDOPT_FLAG_DNSSL,
149 };
150
151 static void rtadvd_shutdown(void);
152 static void sock_open(struct sockinfo *);
153 static void rtsock_open(struct sockinfo *);
154 static void rtadvd_input(struct sockinfo *);
155 static void rs_input(int, struct nd_router_solicit *,
156 struct in6_pktinfo *, struct sockaddr_in6 *);
157 static void ra_input(int, struct nd_router_advert *,
158 struct in6_pktinfo *, struct sockaddr_in6 *);
159 static int prefix_check(struct nd_opt_prefix_info *, struct rainfo *,
160 struct sockaddr_in6 *);
161 static int nd6_options(struct nd_opt_hdr *, int,
162 union nd_opt *, uint32_t);
163 static void free_ndopts(union nd_opt *);
164 static void rtmsg_input(struct sockinfo *);
165 static void set_short_delay(struct ifinfo *);
166 static int check_accept_rtadv(int);
167
168 static void
169 usage(void)
170 {
171
172 fprintf(stderr, "usage: rtadvd [-dDfRs] "
173 "[-c configfile] [-C ctlsock] [-M ifname] [-p pidfile]\n");
174 exit(1);
175 }
176
177 int
178 main(int argc, char *argv[])
179 {
180 struct pollfd set[PFD_MAX];
181 struct timespec *timeout;
182 int i, ch;
183 int fflag = 0, logopt;
184 int error;
185 pid_t otherpid;
186
187 /* get command line options and arguments */
188 while ((ch = getopt(argc, argv, "c:C:dDfhM:p:Rs")) != -1) {
189 switch (ch) {
190 case 'c':
191 conffile = optarg;
192 break;
193 case 'C':
194 ctrlsock.si_name = optarg;
195 break;
196 case 'd':
197 dflag++;
198 break;
199 case 'D':
200 dflag += 3;
201 break;
202 case 'f':
203 fflag = 1;
204 break;
205 case 'M':
206 mcastif = optarg;
207 break;
208 case 'R':
209 fprintf(stderr, "rtadvd: "
210 "the -R option is currently ignored.\n");
211 /* accept_rr = 1; */
212 /* run anyway... */
213 break;
214 case 's':
215 sflag = 1;
216 break;
217 case 'p':
218 pidfilename = optarg;
219 break;
220 default:
221 usage();
222 }
223 }
224 argc -= optind;
225 argv += optind;
226
227 logopt = LOG_NDELAY | LOG_PID;
228 if (fflag)
229 logopt |= LOG_PERROR;
230 openlog("rtadvd", logopt, LOG_DAEMON);
231
232 /* set log level */
233 if (dflag > 2)
234 (void)setlogmask(LOG_UPTO(LOG_DEBUG));
235 else if (dflag > 1)
236 (void)setlogmask(LOG_UPTO(LOG_INFO));
237 else if (dflag > 0)
238 (void)setlogmask(LOG_UPTO(LOG_NOTICE));
239 else
240 (void)setlogmask(LOG_UPTO(LOG_ERR));
241
242 /* timer initialization */
243 rtadvd_timer_init();
244
245 #ifndef HAVE_ARC4RANDOM
246 /* random value initialization */
247 #ifdef __FreeBSD__
248 srandomdev();
249 #else
250 srandom((unsigned long)time(NULL));
251 #endif
252 #endif
253 pfh = pidfile_open(pidfilename, 0600, &otherpid);
254 if (pfh == NULL) {
255 if (errno == EEXIST)
256 errx(1, "%s already running, pid: %d",
257 getprogname(), otherpid);
258 syslog(LOG_ERR,
259 "failed to open the pid file %s, run anyway.",
260 pidfilename);
261 }
262 if (!fflag)
263 daemon(1, 0);
264
265 sock_open(&sock);
266
267 update_ifinfo(&ifilist, UPDATE_IFINFO_ALL);
268 for (i = 0; i < argc; i++)
269 update_persist_ifinfo(&ifilist, argv[i]);
270
271 csock_open(&ctrlsock, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
272 if (ctrlsock.si_fd == -1) {
273 syslog(LOG_ERR, "cannot open control socket: %s",
274 strerror(errno));
275 exit(1);
276 }
277
278 /* record the current PID */
279 pidfile_write(pfh);
280
281 set[PFD_RAWSOCK].fd = sock.si_fd;
282 set[PFD_RAWSOCK].events = POLLIN;
283 if (sflag == 0) {
284 rtsock_open(&rtsock);
285 set[PFD_RTSOCK].fd = rtsock.si_fd;
286 set[PFD_RTSOCK].events = POLLIN;
287 } else
288 set[PFD_RTSOCK].fd = -1;
289 set[PFD_CSOCK].fd = ctrlsock.si_fd;
290 set[PFD_CSOCK].events = POLLIN;
291 signal(SIGTERM, set_do_shutdown);
292 signal(SIGINT, set_do_shutdown);
293 signal(SIGHUP, set_do_reload);
294
295 error = csock_listen(&ctrlsock);
296 if (error) {
297 syslog(LOG_ERR, "cannot listen control socket: %s",
298 strerror(errno));
299 exit(1);
300 }
301
302 /* load configuration file */
303 set_do_reload(0);
304
305 while (1) {
306 if (is_do_shutdown())
307 rtadvd_shutdown();
308
309 if (is_do_reload()) {
310 loadconfig_ifname(reload_ifname());
311 if (reload_ifname() == NULL)
312 syslog(LOG_INFO,
313 "configuration file reloaded.");
314 else
315 syslog(LOG_INFO,
316 "configuration file for %s reloaded.",
317 reload_ifname());
318 reset_do_reload();
319 }
320
321 /* timeout handler update for active interfaces */
322 rtadvd_update_timeout_handler();
323
324 /* timer expiration check and reset the timer */
325 timeout = rtadvd_check_timer();
326
327 if (timeout != NULL) {
328 syslog(LOG_DEBUG,
329 "<%s> set timer to %ld:%ld. waiting for "
330 "inputs or timeout", __func__,
331 (long int)timeout->tv_sec,
332 (long int)timeout->tv_nsec / 1000);
333 } else {
334 syslog(LOG_DEBUG,
335 "<%s> there's no timer. waiting for inputs",
336 __func__);
337 }
338 if ((i = poll(set, sizeof(set)/sizeof(set[0]),
339 timeout ? (timeout->tv_sec * 1000 +
340 timeout->tv_nsec / 1000 / 1000) : INFTIM)) < 0) {
341
342 /* EINTR would occur if a signal was delivered */
343 if (errno != EINTR)
344 syslog(LOG_ERR, "poll() failed: %s",
345 strerror(errno));
346 continue;
347 }
348 if (i == 0) /* timeout */
349 continue;
350 if (rtsock.si_fd != -1 && set[PFD_RTSOCK].revents & POLLIN)
351 rtmsg_input(&rtsock);
352
353 if (set[PFD_RAWSOCK].revents & POLLIN)
354 rtadvd_input(&sock);
355
356 if (set[PFD_CSOCK].revents & POLLIN) {
357 int fd;
358
359 fd = csock_accept(&ctrlsock);
360 if (fd == -1)
361 syslog(LOG_ERR,
362 "cannot accept() control socket: %s",
363 strerror(errno));
364 else {
365 cm_handler_server(fd);
366 close(fd);
367 }
368 }
369 }
370 exit(0); /* NOTREACHED */
371 }
372
373 static void
374 rtadvd_shutdown(void)
375 {
376 struct ifinfo *ifi;
377 struct rainfo *rai;
378 struct rdnss *rdn;
379 struct dnssl *dns;
380
381 if (wait_shutdown) {
382 syslog(LOG_INFO,
383 "waiting expiration of the all RA timers.");
384
385 TAILQ_FOREACH(ifi, &ifilist, ifi_next) {
386 /*
387 * Ignore !IFF_UP interfaces in waiting for shutdown.
388 */
389 if (!(ifi->ifi_flags & IFF_UP) &&
390 ifi->ifi_ra_timer != NULL) {
391 ifi->ifi_state = IFI_STATE_UNCONFIGURED;
392 rtadvd_remove_timer(ifi->ifi_ra_timer);
393 ifi->ifi_ra_timer = NULL;
394 syslog(LOG_DEBUG, "<%s> %s(idx=%d) is down. "
395 "Timer removed and marked as UNCONFIGURED.",
396 __func__, ifi->ifi_ifname,
397 ifi->ifi_ifindex);
398 }
399 }
400 TAILQ_FOREACH(ifi, &ifilist, ifi_next) {
401 if (ifi->ifi_ra_timer != NULL)
402 break;
403 }
404 if (ifi == NULL) {
405 syslog(LOG_NOTICE, "gracefully terminated.");
406 exit(0);
407 }
408
409 sleep(1);
410 return;
411 }
412
413 syslog(LOG_DEBUG, "<%s> cease to be an advertising router",
414 __func__);
415
416 wait_shutdown = 1;
417
418 TAILQ_FOREACH(rai, &railist, rai_next) {
419 rai->rai_lifetime = 0;
420 TAILQ_FOREACH(rdn, &rai->rai_rdnss, rd_next)
421 rdn->rd_ltime = 0;
422 TAILQ_FOREACH(dns, &rai->rai_dnssl, dn_next)
423 dns->dn_ltime = 0;
424 }
425 TAILQ_FOREACH(ifi, &ifilist, ifi_next) {
426 if (!ifi->ifi_persist)
427 continue;
428 if (ifi->ifi_state == IFI_STATE_UNCONFIGURED)
429 continue;
430 if (ifi->ifi_ra_timer == NULL)
431 continue;
432 if (ifi->ifi_ra_lastsent.tv_sec == 0 &&
433 ifi->ifi_ra_lastsent.tv_nsec == 0 &&
434 ifi->ifi_ra_timer != NULL) {
435 /*
436 * When RA configured but never sent,
437 * ignore the IF immediately.
438 */
439 rtadvd_remove_timer(ifi->ifi_ra_timer);
440 ifi->ifi_ra_timer = NULL;
441 ifi->ifi_state = IFI_STATE_UNCONFIGURED;
442 continue;
443 }
444
445 ifi->ifi_state = IFI_STATE_TRANSITIVE;
446
447 /* Mark as the shut-down state. */
448 ifi->ifi_rainfo_trans = ifi->ifi_rainfo;
449 ifi->ifi_rainfo = NULL;
450
451 ifi->ifi_burstcount = MAX_FINAL_RTR_ADVERTISEMENTS;
452 ifi->ifi_burstinterval = MIN_DELAY_BETWEEN_RAS;
453
454 ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm);
455 rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm,
456 ifi->ifi_ra_timer);
457 }
458 syslog(LOG_NOTICE, "final RA transmission started.");
459
460 pidfile_remove(pfh);
461 csock_close(&ctrlsock);
462 }
463
464 static void
465 rtmsg_input(struct sockinfo *s)
466 {
467 int n, type, ifindex = 0, plen;
468 size_t len;
469 char msg[2048], *next, *lim;
470 char ifname[IFNAMSIZ];
471 struct if_announcemsghdr *ifan;
472 struct rt_msghdr *rtm;
473 struct prefix *pfx;
474 struct rainfo *rai;
475 struct in6_addr *addr;
476 struct ifinfo *ifi;
477 char addrbuf[INET6_ADDRSTRLEN];
478 int prefixchange = 0;
479
480 if (s == NULL) {
481 syslog(LOG_ERR, "<%s> internal error", __func__);
482 exit(1);
483 }
484 n = read(s->si_fd, msg, sizeof(msg));
485 rtm = (struct rt_msghdr *)msg;
486 syslog(LOG_DEBUG, "<%s> received a routing message "
487 "(type = %d, len = %d)", __func__, rtm->rtm_type, n);
488
489 if (n > rtm->rtm_msglen) {
490 /*
491 * This usually won't happen for messages received on
492 * a routing socket.
493 */
494 syslog(LOG_DEBUG,
495 "<%s> received data length is larger than "
496 "1st routing message len. multiple messages? "
497 "read %d bytes, but 1st msg len = %d",
498 __func__, n, rtm->rtm_msglen);
499 #if 0
500 /* adjust length */
501 n = rtm->rtm_msglen;
502 #endif
503 }
504
505 lim = msg + n;
506 for (next = msg; next < lim; next += len) {
507 int oldifflags;
508
509 next = get_next_msg(next, lim, 0, &len,
510 RTADV_TYPE2BITMASK(RTM_ADD) |
511 RTADV_TYPE2BITMASK(RTM_DELETE) |
512 RTADV_TYPE2BITMASK(RTM_NEWADDR) |
513 RTADV_TYPE2BITMASK(RTM_DELADDR) |
514 RTADV_TYPE2BITMASK(RTM_IFINFO) |
515 RTADV_TYPE2BITMASK(RTM_IFANNOUNCE));
516 if (len == 0)
517 break;
518 type = ((struct rt_msghdr *)next)->rtm_type;
519 switch (type) {
520 case RTM_ADD:
521 case RTM_DELETE:
522 ifindex = get_rtm_ifindex(next);
523 break;
524 case RTM_NEWADDR:
525 case RTM_DELADDR:
526 ifindex = (int)((struct ifa_msghdr *)next)->ifam_index;
527 break;
528 case RTM_IFINFO:
529 ifindex = (int)((struct if_msghdr *)next)->ifm_index;
530 break;
531 case RTM_IFANNOUNCE:
532 ifan = (struct if_announcemsghdr *)next;
533 switch (ifan->ifan_what) {
534 case IFAN_ARRIVAL:
535 case IFAN_DEPARTURE:
536 break;
537 default:
538 syslog(LOG_DEBUG,
539 "<%s:%d> unknown ifan msg (ifan_what=%d)",
540 __func__, __LINE__, ifan->ifan_what);
541 continue;
542 }
543
544 syslog(LOG_DEBUG, "<%s>: if_announcemsg (idx=%d:%d)",
545 __func__, ifan->ifan_index, ifan->ifan_what);
546 switch (ifan->ifan_what) {
547 case IFAN_ARRIVAL:
548 syslog(LOG_NOTICE,
549 "interface added (idx=%d)",
550 ifan->ifan_index);
551 update_ifinfo(&ifilist, ifan->ifan_index);
552 loadconfig_index(ifan->ifan_index);
553 break;
554 case IFAN_DEPARTURE:
555 syslog(LOG_NOTICE,
556 "interface removed (idx=%d)",
557 ifan->ifan_index);
558 rm_ifinfo_index(ifan->ifan_index);
559
560 /* Clear ifi_ifindex */
561 TAILQ_FOREACH(ifi, &ifilist, ifi_next) {
562 if (ifi->ifi_ifindex
563 == ifan->ifan_index) {
564 ifi->ifi_ifindex = 0;
565 break;
566 }
567 }
568 update_ifinfo(&ifilist, ifan->ifan_index);
569 break;
570 }
571 continue;
572 default:
573 /* should not reach here */
574 syslog(LOG_DEBUG,
575 "<%s:%d> unknown rtmsg %d on %s",
576 __func__, __LINE__, type,
577 if_indextoname(ifindex, ifname));
578 continue;
579 }
580 ifi = if_indextoifinfo(ifindex);
581 if (ifi == NULL) {
582 syslog(LOG_DEBUG,
583 "<%s> ifinfo not found for idx=%d. Why?",
584 __func__, ifindex);
585 continue;
586 }
587 rai = ifi->ifi_rainfo;
588 if (rai == NULL) {
589 syslog(LOG_DEBUG,
590 "<%s> route changed on "
591 "non advertising interface(%s)",
592 __func__, ifi->ifi_ifname);
593 continue;
594 }
595
596 oldifflags = ifi->ifi_flags;
597 /* init ifflags because it may have changed */
598 update_ifinfo(&ifilist, ifindex);
599
600 switch (type) {
601 case RTM_ADD:
602 if (sflag)
603 break; /* we aren't interested in prefixes */
604
605 addr = get_addr(msg);
606 plen = get_prefixlen(msg);
607 /* sanity check for plen */
608 /* as RFC2373, prefixlen is at least 4 */
609 if (plen < 4 || plen > 127) {
610 syslog(LOG_INFO, "<%s> new interface route's"
611 "plen %d is invalid for a prefix",
612 __func__, plen);
613 break;
614 }
615 pfx = find_prefix(rai, addr, plen);
616 if (pfx) {
617 if (pfx->pfx_timer) {
618 /*
619 * If the prefix has been invalidated,
620 * make it available again.
621 */
622 update_prefix(pfx);
623 prefixchange = 1;
624 } else
625 syslog(LOG_DEBUG,
626 "<%s> new prefix(%s/%d) "
627 "added on %s, "
628 "but it was already in list",
629 __func__,
630 inet_ntop(AF_INET6, addr,
631 (char *)addrbuf,
632 sizeof(addrbuf)),
633 plen, ifi->ifi_ifname);
634 break;
635 }
636 make_prefix(rai, ifindex, addr, plen);
637 prefixchange = 1;
638 break;
639 case RTM_DELETE:
640 if (sflag)
641 break;
642
643 addr = get_addr(msg);
644 plen = get_prefixlen(msg);
645 /* sanity check for plen */
646 /* as RFC2373, prefixlen is at least 4 */
647 if (plen < 4 || plen > 127) {
648 syslog(LOG_INFO,
649 "<%s> deleted interface route's "
650 "plen %d is invalid for a prefix",
651 __func__, plen);
652 break;
653 }
654 pfx = find_prefix(rai, addr, plen);
655 if (pfx == NULL) {
656 syslog(LOG_DEBUG,
657 "<%s> prefix(%s/%d) was deleted on %s, "
658 "but it was not in list",
659 __func__, inet_ntop(AF_INET6, addr,
660 (char *)addrbuf, sizeof(addrbuf)),
661 plen, ifi->ifi_ifname);
662 break;
663 }
664 invalidate_prefix(pfx);
665 prefixchange = 1;
666 break;
667 case RTM_NEWADDR:
668 case RTM_DELADDR:
669 case RTM_IFINFO:
670 break;
671 default:
672 /* should not reach here */
673 syslog(LOG_DEBUG,
674 "<%s:%d> unknown rtmsg %d on %s",
675 __func__, __LINE__, type,
676 if_indextoname(ifindex, ifname));
677 return;
678 }
679
680 /* check if an interface flag is changed */
681 if ((oldifflags & IFF_UP) && /* UP to DOWN */
682 !(ifi->ifi_flags & IFF_UP)) {
683 syslog(LOG_NOTICE,
684 "<interface %s becomes down. stop timer.",
685 ifi->ifi_ifname);
686 rtadvd_remove_timer(ifi->ifi_ra_timer);
687 ifi->ifi_ra_timer = NULL;
688 } else if (!(oldifflags & IFF_UP) && /* DOWN to UP */
689 (ifi->ifi_flags & IFF_UP)) {
690 syslog(LOG_NOTICE,
691 "interface %s becomes up. restart timer.",
692 ifi->ifi_ifname);
693
694 ifi->ifi_state = IFI_STATE_TRANSITIVE;
695 ifi->ifi_burstcount =
696 MAX_INITIAL_RTR_ADVERTISEMENTS;
697 ifi->ifi_burstinterval =
698 MAX_INITIAL_RTR_ADVERT_INTERVAL;
699
700 ifi->ifi_ra_timer = rtadvd_add_timer(ra_timeout,
701 ra_timer_update, ifi, ifi);
702 ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm);
703 rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm,
704 ifi->ifi_ra_timer);
705 } else if (prefixchange &&
706 (ifi->ifi_flags & IFF_UP)) {
707 /*
708 * An advertised prefix has been added or invalidated.
709 * Will notice the change in a short delay.
710 */
711 set_short_delay(ifi);
712 }
713 }
714
715 return;
716 }
717
718 void
719 rtadvd_input(struct sockinfo *s)
720 {
721 ssize_t i;
722 int *hlimp = NULL;
723 #ifdef OLDRAWSOCKET
724 struct ip6_hdr *ip;
725 #endif
726 struct icmp6_hdr *icp;
727 int ifindex = 0;
728 struct cmsghdr *cm;
729 struct in6_pktinfo *pi = NULL;
730 char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
731 struct in6_addr dst = in6addr_any;
732 struct ifinfo *ifi;
733
734 syslog(LOG_DEBUG, "<%s> enter", __func__);
735
736 if (s == NULL) {
737 syslog(LOG_ERR, "<%s> internal error", __func__);
738 exit(1);
739 }
740 /*
741 * Get message. We reset msg_controllen since the field could
742 * be modified if we had received a message before setting
743 * receive options.
744 */
745 rcvmhdr.msg_controllen = rcvcmsgbuflen;
746 if ((i = recvmsg(s->si_fd, &rcvmhdr, 0)) < 0)
747 return;
748
749 /* extract optional information via Advanced API */
750 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&rcvmhdr);
751 cm;
752 cm = (struct cmsghdr *)CMSG_NXTHDR(&rcvmhdr, cm)) {
753 if (cm->cmsg_level == IPPROTO_IPV6 &&
754 cm->cmsg_type == IPV6_PKTINFO &&
755 cm->cmsg_len == CMSG_LEN(sizeof(struct in6_pktinfo))) {
756 pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
757 ifindex = pi->ipi6_ifindex;
758 dst = pi->ipi6_addr;
759 }
760 if (cm->cmsg_level == IPPROTO_IPV6 &&
761 cm->cmsg_type == IPV6_HOPLIMIT &&
762 cm->cmsg_len == CMSG_LEN(sizeof(int)))
763 hlimp = (int *)CMSG_DATA(cm);
764 }
765 if (ifindex == 0) {
766 syslog(LOG_ERR, "failed to get receiving interface");
767 return;
768 }
769 if (hlimp == NULL) {
770 syslog(LOG_ERR, "failed to get receiving hop limit");
771 return;
772 }
773
774 /*
775 * If we happen to receive data on an interface which is now gone
776 * or down, just discard the data.
777 */
778 ifi = if_indextoifinfo(pi->ipi6_ifindex);
779 if (ifi == NULL || !(ifi->ifi_flags & IFF_UP)) {
780 syslog(LOG_INFO,
781 "<%s> received data on a disabled interface (%s)",
782 __func__,
783 (ifi == NULL) ? "[gone]" : ifi->ifi_ifname);
784 return;
785 }
786
787 #ifdef OLDRAWSOCKET
788 if ((size_t)i < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr)) {
789 syslog(LOG_ERR,
790 "packet size(%d) is too short", i);
791 return;
792 }
793
794 ip = (struct ip6_hdr *)rcvmhdr.msg_iov[0].iov_base;
795 icp = (struct icmp6_hdr *)(ip + 1); /* XXX: ext. hdr? */
796 #else
797 if ((size_t)i < sizeof(struct icmp6_hdr)) {
798 syslog(LOG_ERR, "packet size(%zd) is too short", i);
799 return;
800 }
801
802 icp = (struct icmp6_hdr *)rcvmhdr.msg_iov[0].iov_base;
803 #endif
804
805 switch (icp->icmp6_type) {
806 case ND_ROUTER_SOLICIT:
807 /*
808 * Message verification - RFC 4861 6.1.1
809 * XXX: these checks must be done in the kernel as well,
810 * but we can't completely rely on them.
811 */
812 if (*hlimp != 255) {
813 syslog(LOG_NOTICE,
814 "RS with invalid hop limit(%d) "
815 "received from %s on %s",
816 *hlimp,
817 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
818 sizeof(ntopbuf)),
819 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
820 return;
821 }
822 if (icp->icmp6_code) {
823 syslog(LOG_NOTICE,
824 "RS with invalid ICMP6 code(%d) "
825 "received from %s on %s",
826 icp->icmp6_code,
827 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
828 sizeof(ntopbuf)),
829 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
830 return;
831 }
832 if ((size_t)i < sizeof(struct nd_router_solicit)) {
833 syslog(LOG_NOTICE,
834 "RS from %s on %s does not have enough "
835 "length (len = %zd)",
836 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
837 sizeof(ntopbuf)),
838 if_indextoname(pi->ipi6_ifindex, ifnamebuf), i);
839 return;
840 }
841 rs_input(i, (struct nd_router_solicit *)icp, pi, &rcvfrom);
842 break;
843 case ND_ROUTER_ADVERT:
844 /*
845 * Message verification - RFC 4861 6.1.2
846 * XXX: there's the same dilemma as above...
847 */
848 if (!IN6_IS_ADDR_LINKLOCAL(&rcvfrom.sin6_addr)) {
849 syslog(LOG_NOTICE,
850 "RA with non-linklocal source address "
851 "received from %s on %s",
852 inet_ntop(AF_INET6, &rcvfrom.sin6_addr,
853 ntopbuf, sizeof(ntopbuf)),
854 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
855 return;
856 }
857 if (*hlimp != 255) {
858 syslog(LOG_NOTICE,
859 "RA with invalid hop limit(%d) "
860 "received from %s on %s",
861 *hlimp,
862 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
863 sizeof(ntopbuf)),
864 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
865 return;
866 }
867 if (icp->icmp6_code) {
868 syslog(LOG_NOTICE,
869 "RA with invalid ICMP6 code(%d) "
870 "received from %s on %s",
871 icp->icmp6_code,
872 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
873 sizeof(ntopbuf)),
874 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
875 return;
876 }
877 if ((size_t)i < sizeof(struct nd_router_advert)) {
878 syslog(LOG_NOTICE,
879 "RA from %s on %s does not have enough "
880 "length (len = %zd)",
881 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
882 sizeof(ntopbuf)),
883 if_indextoname(pi->ipi6_ifindex, ifnamebuf), i);
884 return;
885 }
886 ra_input(i, (struct nd_router_advert *)icp, pi, &rcvfrom);
887 break;
888 case ICMP6_ROUTER_RENUMBERING:
889 if (mcastif == NULL) {
890 syslog(LOG_ERR, "received a router renumbering "
891 "message, but not allowed to be accepted");
892 break;
893 }
894 rr_input(i, (struct icmp6_router_renum *)icp, pi, &rcvfrom,
895 &dst);
896 break;
897 default:
898 /*
899 * Note that this case is POSSIBLE, especially just
900 * after invocation of the daemon. This is because we
901 * could receive message after opening the socket and
902 * before setting ICMP6 type filter(see sock_open()).
903 */
904 syslog(LOG_ERR, "invalid icmp type(%d)", icp->icmp6_type);
905 return;
906 }
907
908 return;
909 }
910
911 static void
912 rs_input(int len, struct nd_router_solicit *rs,
913 struct in6_pktinfo *pi, struct sockaddr_in6 *from)
914 {
915 char ntopbuf[INET6_ADDRSTRLEN];
916 char ifnamebuf[IFNAMSIZ];
917 union nd_opt ndopts;
918 struct rainfo *rai;
919 struct ifinfo *ifi;
920 struct soliciter *sol;
921
922 syslog(LOG_DEBUG,
923 "<%s> RS received from %s on %s",
924 __func__,
925 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)),
926 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
927
928 /* ND option check */
929 memset(&ndopts, 0, sizeof(ndopts));
930 TAILQ_INIT(&ndopts.opt_list);
931 if (nd6_options((struct nd_opt_hdr *)(rs + 1),
932 len - sizeof(struct nd_router_solicit),
933 &ndopts, NDOPT_FLAG_SRCLINKADDR)) {
934 syslog(LOG_INFO,
935 "<%s> ND option check failed for an RS from %s on %s",
936 __func__,
937 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
938 sizeof(ntopbuf)),
939 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
940 return;
941 }
942
943 /*
944 * If the IP source address is the unspecified address, there
945 * must be no source link-layer address option in the message.
946 * (RFC 4861 6.1.1)
947 */
948 if (IN6_IS_ADDR_UNSPECIFIED(&from->sin6_addr) &&
949 ndopts.opt_src_lladdr) {
950 syslog(LOG_INFO,
951 "<%s> RS from unspecified src on %s has a link-layer"
952 " address option",
953 __func__, if_indextoname(pi->ipi6_ifindex, ifnamebuf));
954 goto done;
955 }
956
957 ifi = if_indextoifinfo(pi->ipi6_ifindex);
958 if (ifi == NULL) {
959 syslog(LOG_INFO,
960 "<%s> if (idx=%d) not found. Why?",
961 __func__, pi->ipi6_ifindex);
962 goto done;
963 }
964 rai = ifi->ifi_rainfo;
965 if (rai == NULL) {
966 syslog(LOG_INFO,
967 "<%s> RS received on non advertising interface(%s)",
968 __func__,
969 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
970 goto done;
971 }
972
973 rai->rai_ifinfo->ifi_rsinput++;
974
975 /*
976 * Decide whether to send RA according to the rate-limit
977 * consideration.
978 */
979
980 /* record sockaddr waiting for RA, if possible */
981 sol = (struct soliciter *)malloc(sizeof(*sol));
982 if (sol) {
983 sol->sol_addr = *from;
984 /* XXX RFC 2553 need clarification on flowinfo */
985 sol->sol_addr.sin6_flowinfo = 0;
986 TAILQ_INSERT_TAIL(&rai->rai_soliciter, sol, sol_next);
987 }
988
989 /*
990 * If there is already a waiting RS packet, don't
991 * update the timer.
992 */
993 if (ifi->ifi_rs_waitcount++)
994 goto done;
995
996 set_short_delay(ifi);
997
998 done:
999 free_ndopts(&ndopts);
1000 return;
1001 }
1002
1003 static void
1004 set_short_delay(struct ifinfo *ifi)
1005 {
1006 long delay; /* must not be greater than 1000000 */
1007 struct timespec interval, now, min_delay, tm_tmp, *rest;
1008
1009 if (ifi->ifi_ra_timer == NULL)
1010 return;
1011 /*
1012 * Compute a random delay. If the computed value
1013 * corresponds to a time later than the time the next
1014 * multicast RA is scheduled to be sent, ignore the random
1015 * delay and send the advertisement at the
1016 * already-scheduled time. RFC 4861 6.2.6
1017 */
1018 #ifdef HAVE_ARC4RANDOM
1019 delay = arc4random_uniform(MAX_RA_DELAY_TIME);
1020 #else
1021 delay = random() % MAX_RA_DELAY_TIME;
1022 #endif
1023 interval.tv_sec = 0;
1024 interval.tv_nsec = delay * 1000;
1025 rest = rtadvd_timer_rest(ifi->ifi_ra_timer);
1026 if (TS_CMP(rest, &interval, <)) {
1027 syslog(LOG_DEBUG, "<%s> random delay is larger than "
1028 "the rest of the current timer", __func__);
1029 interval = *rest;
1030 }
1031
1032 /*
1033 * If we sent a multicast Router Advertisement within
1034 * the last MIN_DELAY_BETWEEN_RAS seconds, schedule
1035 * the advertisement to be sent at a time corresponding to
1036 * MIN_DELAY_BETWEEN_RAS plus the random value after the
1037 * previous advertisement was sent.
1038 */
1039 clock_gettime(CLOCK_MONOTONIC_FAST, &now);
1040 TS_SUB(&now, &ifi->ifi_ra_lastsent, &tm_tmp);
1041 min_delay.tv_sec = MIN_DELAY_BETWEEN_RAS;
1042 min_delay.tv_nsec = 0;
1043 if (TS_CMP(&tm_tmp, &min_delay, <)) {
1044 TS_SUB(&min_delay, &tm_tmp, &min_delay);
1045 TS_ADD(&min_delay, &interval, &interval);
1046 }
1047 rtadvd_set_timer(&interval, ifi->ifi_ra_timer);
1048 }
1049
1050 static int
1051 check_accept_rtadv(int idx)
1052 {
1053 struct ifinfo *ifi;
1054
1055 TAILQ_FOREACH(ifi, &ifilist, ifi_next) {
1056 if (ifi->ifi_ifindex == idx)
1057 break;
1058 }
1059 if (ifi == NULL) {
1060 syslog(LOG_DEBUG,
1061 "<%s> if (idx=%d) not found. Why?",
1062 __func__, idx);
1063 return (0);
1064 }
1065 #if (__FreeBSD_version < 900000)
1066 /*
1067 * RA_RECV: !ip6.forwarding && ip6.accept_rtadv
1068 * RA_SEND: ip6.forwarding
1069 */
1070 return ((getinet6sysctl(IPV6CTL_FORWARDING) == 0) &&
1071 (getinet6sysctl(IPV6CTL_ACCEPT_RTADV) == 1));
1072 #else
1073 /*
1074 * RA_RECV: ND6_IFF_ACCEPT_RTADV
1075 * RA_SEND: ip6.forwarding
1076 */
1077 if (update_ifinfo_nd_flags(ifi) != 0) {
1078 syslog(LOG_ERR, "cannot get nd6 flags (idx=%d)", idx);
1079 return (0);
1080 }
1081
1082 return (ifi->ifi_nd_flags & ND6_IFF_ACCEPT_RTADV);
1083 #endif
1084 }
1085
1086 static void
1087 ra_input(int len, struct nd_router_advert *nra,
1088 struct in6_pktinfo *pi, struct sockaddr_in6 *from)
1089 {
1090 struct rainfo *rai;
1091 struct ifinfo *ifi;
1092 char ntopbuf[INET6_ADDRSTRLEN];
1093 char ifnamebuf[IFNAMSIZ];
1094 union nd_opt ndopts;
1095 const char *on_off[] = {"OFF", "ON"};
1096 uint32_t reachabletime, retranstimer, mtu;
1097 int inconsistent = 0;
1098 int error;
1099
1100 syslog(LOG_DEBUG, "<%s> RA received from %s on %s", __func__,
1101 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)),
1102 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
1103
1104 /* ND option check */
1105 memset(&ndopts, 0, sizeof(ndopts));
1106 TAILQ_INIT(&ndopts.opt_list);
1107 error = nd6_options((struct nd_opt_hdr *)(nra + 1),
1108 len - sizeof(struct nd_router_advert), &ndopts,
1109 NDOPT_FLAG_SRCLINKADDR | NDOPT_FLAG_PREFIXINFO | NDOPT_FLAG_MTU |
1110 NDOPT_FLAG_RDNSS | NDOPT_FLAG_DNSSL);
1111 if (error) {
1112 syslog(LOG_INFO,
1113 "<%s> ND option check failed for an RA from %s on %s",
1114 __func__,
1115 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1116 sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex,
1117 ifnamebuf));
1118 return;
1119 }
1120
1121 /*
1122 * RA consistency check according to RFC 4861 6.2.7
1123 */
1124 ifi = if_indextoifinfo(pi->ipi6_ifindex);
1125 if (ifi->ifi_rainfo == NULL) {
1126 syslog(LOG_INFO,
1127 "<%s> received RA from %s on non-advertising"
1128 " interface(%s)",
1129 __func__,
1130 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1131 sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex,
1132 ifnamebuf));
1133 goto done;
1134 }
1135 rai = ifi->ifi_rainfo;
1136 ifi->ifi_rainput++;
1137 syslog(LOG_DEBUG, "<%s> ifi->ifi_rainput = %" PRIu64, __func__,
1138 ifi->ifi_rainput);
1139
1140 /* Cur Hop Limit value */
1141 if (nra->nd_ra_curhoplimit && rai->rai_hoplimit &&
1142 nra->nd_ra_curhoplimit != rai->rai_hoplimit) {
1143 syslog(LOG_NOTICE,
1144 "CurHopLimit inconsistent on %s:"
1145 " %d from %s, %d from us",
1146 ifi->ifi_ifname, nra->nd_ra_curhoplimit,
1147 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1148 sizeof(ntopbuf)), rai->rai_hoplimit);
1149 inconsistent++;
1150 }
1151 /* M flag */
1152 if ((nra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED) !=
1153 rai->rai_managedflg) {
1154 syslog(LOG_NOTICE,
1155 "M flag inconsistent on %s:"
1156 " %s from %s, %s from us",
1157 ifi->ifi_ifname, on_off[!rai->rai_managedflg],
1158 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1159 sizeof(ntopbuf)), on_off[rai->rai_managedflg]);
1160 inconsistent++;
1161 }
1162 /* O flag */
1163 if ((nra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER) !=
1164 rai->rai_otherflg) {
1165 syslog(LOG_NOTICE,
1166 "O flag inconsistent on %s:"
1167 " %s from %s, %s from us",
1168 ifi->ifi_ifname, on_off[!rai->rai_otherflg],
1169 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1170 sizeof(ntopbuf)), on_off[rai->rai_otherflg]);
1171 inconsistent++;
1172 }
1173 /* Reachable Time */
1174 reachabletime = ntohl(nra->nd_ra_reachable);
1175 if (reachabletime && rai->rai_reachabletime &&
1176 reachabletime != rai->rai_reachabletime) {
1177 syslog(LOG_NOTICE,
1178 "ReachableTime inconsistent on %s:"
1179 " %d from %s, %d from us",
1180 ifi->ifi_ifname, reachabletime,
1181 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1182 sizeof(ntopbuf)), rai->rai_reachabletime);
1183 inconsistent++;
1184 }
1185 /* Retrans Timer */
1186 retranstimer = ntohl(nra->nd_ra_retransmit);
1187 if (retranstimer && rai->rai_retranstimer &&
1188 retranstimer != rai->rai_retranstimer) {
1189 syslog(LOG_NOTICE,
1190 "RetranceTimer inconsistent on %s:"
1191 " %d from %s, %d from us",
1192 ifi->ifi_ifname, retranstimer,
1193 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1194 sizeof(ntopbuf)), rai->rai_retranstimer);
1195 inconsistent++;
1196 }
1197 /* Values in the MTU options */
1198 if (ndopts.opt_mtu) {
1199 mtu = ntohl(ndopts.opt_mtu->nd_opt_mtu_mtu);
1200 if (mtu && rai->rai_linkmtu && mtu != rai->rai_linkmtu) {
1201 syslog(LOG_NOTICE,
1202 "MTU option value inconsistent on %s:"
1203 " %d from %s, %d from us",
1204 ifi->ifi_ifname, mtu,
1205 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1206 sizeof(ntopbuf)), rai->rai_linkmtu);
1207 inconsistent++;
1208 }
1209 }
1210 /* Preferred and Valid Lifetimes for prefixes */
1211 {
1212 struct nd_optlist *nol;
1213
1214 if (ndopts.opt_pi)
1215 if (prefix_check(ndopts.opt_pi, rai, from))
1216 inconsistent++;
1217
1218 TAILQ_FOREACH(nol, &ndopts.opt_list, nol_next)
1219 if (prefix_check((struct nd_opt_prefix_info *)nol->nol_opt,
1220 rai, from))
1221 inconsistent++;
1222 }
1223
1224 if (inconsistent)
1225 ifi->ifi_rainconsistent++;
1226
1227 done:
1228 free_ndopts(&ndopts);
1229 return;
1230 }
1231
1232 static uint32_t
1233 udiff(uint32_t u, uint32_t v)
1234 {
1235 return (u >= v ? u - v : v - u);
1236 }
1237
1238 /* return a non-zero value if the received prefix is inconsitent with ours */
1239 static int
1240 prefix_check(struct nd_opt_prefix_info *pinfo,
1241 struct rainfo *rai, struct sockaddr_in6 *from)
1242 {
1243 struct ifinfo *ifi;
1244 uint32_t preferred_time, valid_time;
1245 struct prefix *pfx;
1246 int inconsistent = 0;
1247 char ntopbuf[INET6_ADDRSTRLEN];
1248 char prefixbuf[INET6_ADDRSTRLEN];
1249 struct timespec now;
1250
1251 #if 0 /* impossible */
1252 if (pinfo->nd_opt_pi_type != ND_OPT_PREFIX_INFORMATION)
1253 return (0);
1254 #endif
1255 ifi = rai->rai_ifinfo;
1256 /*
1257 * log if the adveritsed prefix has link-local scope(sanity check?)
1258 */
1259 if (IN6_IS_ADDR_LINKLOCAL(&pinfo->nd_opt_pi_prefix))
1260 syslog(LOG_INFO,
1261 "<%s> link-local prefix %s/%d is advertised "
1262 "from %s on %s",
1263 __func__,
1264 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf,
1265 sizeof(prefixbuf)),
1266 pinfo->nd_opt_pi_prefix_len,
1267 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1268 sizeof(ntopbuf)), ifi->ifi_ifname);
1269
1270 if ((pfx = find_prefix(rai, &pinfo->nd_opt_pi_prefix,
1271 pinfo->nd_opt_pi_prefix_len)) == NULL) {
1272 syslog(LOG_INFO,
1273 "<%s> prefix %s/%d from %s on %s is not in our list",
1274 __func__,
1275 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf,
1276 sizeof(prefixbuf)),
1277 pinfo->nd_opt_pi_prefix_len,
1278 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1279 sizeof(ntopbuf)), ifi->ifi_ifname);
1280 return (0);
1281 }
1282
1283 preferred_time = ntohl(pinfo->nd_opt_pi_preferred_time);
1284 if (pfx->pfx_pltimeexpire) {
1285 /*
1286 * The lifetime is decremented in real time, so we should
1287 * compare the expiration time.
1288 * (RFC 2461 Section 6.2.7.)
1289 * XXX: can we really expect that all routers on the link
1290 * have synchronized clocks?
1291 */
1292 clock_gettime(CLOCK_MONOTONIC_FAST, &now);
1293 preferred_time += now.tv_sec;
1294
1295 if (!pfx->pfx_timer && rai->rai_clockskew &&
1296 udiff(preferred_time, pfx->pfx_pltimeexpire) > rai->rai_clockskew) {
1297 syslog(LOG_INFO,
1298 "<%s> preferred lifetime for %s/%d"
1299 " (decr. in real time) inconsistent on %s:"
1300 " %" PRIu32 " from %s, %" PRIu32 " from us",
1301 __func__,
1302 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf,
1303 sizeof(prefixbuf)),
1304 pinfo->nd_opt_pi_prefix_len,
1305 ifi->ifi_ifname, preferred_time,
1306 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1307 sizeof(ntopbuf)), pfx->pfx_pltimeexpire);
1308 inconsistent++;
1309 }
1310 } else if (!pfx->pfx_timer && preferred_time != pfx->pfx_preflifetime)
1311 syslog(LOG_INFO,
1312 "<%s> preferred lifetime for %s/%d"
1313 " inconsistent on %s:"
1314 " %d from %s, %d from us",
1315 __func__,
1316 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf,
1317 sizeof(prefixbuf)),
1318 pinfo->nd_opt_pi_prefix_len,
1319 ifi->ifi_ifname, preferred_time,
1320 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1321 sizeof(ntopbuf)), pfx->pfx_preflifetime);
1322
1323 valid_time = ntohl(pinfo->nd_opt_pi_valid_time);
1324 if (pfx->pfx_vltimeexpire) {
1325 clock_gettime(CLOCK_MONOTONIC_FAST, &now);
1326 valid_time += now.tv_sec;
1327
1328 if (!pfx->pfx_timer && rai->rai_clockskew &&
1329 udiff(valid_time, pfx->pfx_vltimeexpire) > rai->rai_clockskew) {
1330 syslog(LOG_INFO,
1331 "<%s> valid lifetime for %s/%d"
1332 " (decr. in real time) inconsistent on %s:"
1333 " %d from %s, %" PRIu32 " from us",
1334 __func__,
1335 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf,
1336 sizeof(prefixbuf)),
1337 pinfo->nd_opt_pi_prefix_len,
1338 ifi->ifi_ifname, preferred_time,
1339 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1340 sizeof(ntopbuf)), pfx->pfx_vltimeexpire);
1341 inconsistent++;
1342 }
1343 } else if (!pfx->pfx_timer && valid_time != pfx->pfx_validlifetime) {
1344 syslog(LOG_INFO,
1345 "<%s> valid lifetime for %s/%d"
1346 " inconsistent on %s:"
1347 " %d from %s, %d from us",
1348 __func__,
1349 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf,
1350 sizeof(prefixbuf)),
1351 pinfo->nd_opt_pi_prefix_len,
1352 ifi->ifi_ifname, valid_time,
1353 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1354 sizeof(ntopbuf)), pfx->pfx_validlifetime);
1355 inconsistent++;
1356 }
1357
1358 return (inconsistent);
1359 }
1360
1361 struct prefix *
1362 find_prefix(struct rainfo *rai, struct in6_addr *prefix, int plen)
1363 {
1364 struct prefix *pfx;
1365 int bytelen, bitlen;
1366 char bitmask;
1367
1368 TAILQ_FOREACH(pfx, &rai->rai_prefix, pfx_next) {
1369 if (plen != pfx->pfx_prefixlen)
1370 continue;
1371
1372 bytelen = plen / 8;
1373 bitlen = plen % 8;
1374 bitmask = 0xff << (8 - bitlen);
1375
1376 if (memcmp((void *)prefix, (void *)&pfx->pfx_prefix, bytelen))
1377 continue;
1378
1379 if (bitlen == 0 ||
1380 ((prefix->s6_addr[bytelen] & bitmask) ==
1381 (pfx->pfx_prefix.s6_addr[bytelen] & bitmask))) {
1382 return (pfx);
1383 }
1384 }
1385
1386 return (NULL);
1387 }
1388
1389 /* check if p0/plen0 matches p1/plen1; return 1 if matches, otherwise 0. */
1390 int
1391 prefix_match(struct in6_addr *p0, int plen0,
1392 struct in6_addr *p1, int plen1)
1393 {
1394 int bytelen, bitlen;
1395 char bitmask;
1396
1397 if (plen0 < plen1)
1398 return (0);
1399
1400 bytelen = plen1 / 8;
1401 bitlen = plen1 % 8;
1402 bitmask = 0xff << (8 - bitlen);
1403
1404 if (memcmp((void *)p0, (void *)p1, bytelen))
1405 return (0);
1406
1407 if (bitlen == 0 ||
1408 ((p0->s6_addr[bytelen] & bitmask) ==
1409 (p1->s6_addr[bytelen] & bitmask))) {
1410 return (1);
1411 }
1412
1413 return (0);
1414 }
1415
1416 static int
1417 nd6_options(struct nd_opt_hdr *hdr, int limit,
1418 union nd_opt *ndopts, uint32_t optflags)
1419 {
1420 int optlen = 0;
1421
1422 for (; limit > 0; limit -= optlen) {
1423 if ((size_t)limit < sizeof(struct nd_opt_hdr)) {
1424 syslog(LOG_INFO, "<%s> short option header", __func__);
1425 goto bad;
1426 }
1427
1428 hdr = (struct nd_opt_hdr *)((caddr_t)hdr + optlen);
1429 if (hdr->nd_opt_len == 0) {
1430 syslog(LOG_INFO,
1431 "<%s> bad ND option length(0) (type = %d)",
1432 __func__, hdr->nd_opt_type);
1433 goto bad;
1434 }
1435 optlen = hdr->nd_opt_len << 3;
1436 if (optlen > limit) {
1437 syslog(LOG_INFO, "<%s> short option", __func__);
1438 goto bad;
1439 }
1440
1441 if (hdr->nd_opt_type > ND_OPT_MTU &&
1442 hdr->nd_opt_type != ND_OPT_RDNSS &&
1443 hdr->nd_opt_type != ND_OPT_DNSSL) {
1444 syslog(LOG_INFO, "<%s> unknown ND option(type %d)",
1445 __func__, hdr->nd_opt_type);
1446 continue;
1447 }
1448
1449 if ((ndopt_flags[hdr->nd_opt_type] & optflags) == 0) {
1450 syslog(LOG_INFO, "<%s> unexpected ND option(type %d)",
1451 __func__, hdr->nd_opt_type);
1452 continue;
1453 }
1454
1455 /*
1456 * Option length check. Do it here for all fixed-length
1457 * options.
1458 */
1459 switch (hdr->nd_opt_type) {
1460 case ND_OPT_MTU:
1461 if (optlen == sizeof(struct nd_opt_mtu))
1462 break;
1463 goto skip;
1464 case ND_OPT_RDNSS:
1465 if (optlen >= 24 &&
1466 (optlen - sizeof(struct nd_opt_rdnss)) % 16 == 0)
1467 break;
1468 goto skip;
1469 case ND_OPT_DNSSL:
1470 if (optlen >= 16 &&
1471 (optlen - sizeof(struct nd_opt_dnssl)) % 8 == 0)
1472 break;
1473 goto skip;
1474 case ND_OPT_PREFIX_INFORMATION:
1475 if (optlen == sizeof(struct nd_opt_prefix_info))
1476 break;
1477 skip:
1478 syslog(LOG_INFO, "<%s> invalid option length",
1479 __func__);
1480 continue;
1481 }
1482
1483 switch (hdr->nd_opt_type) {
1484 case ND_OPT_TARGET_LINKADDR:
1485 case ND_OPT_REDIRECTED_HEADER:
1486 case ND_OPT_RDNSS:
1487 case ND_OPT_DNSSL:
1488 break; /* we don't care about these options */
1489 case ND_OPT_SOURCE_LINKADDR:
1490 case ND_OPT_MTU:
1491 if (ndopts->opt_array[hdr->nd_opt_type]) {
1492 syslog(LOG_INFO,
1493 "<%s> duplicated ND option (type = %d)",
1494 __func__, hdr->nd_opt_type);
1495 }
1496 ndopts->opt_array[hdr->nd_opt_type] = hdr;
1497 break;
1498 case ND_OPT_PREFIX_INFORMATION:
1499 {
1500 struct nd_optlist *nol;
1501
1502 if (ndopts->opt_pi == 0) {
1503 ndopts->opt_pi =
1504 (struct nd_opt_prefix_info *)hdr;
1505 continue;
1506 }
1507 nol = malloc(sizeof(*nol));
1508 if (nol == NULL) {
1509 syslog(LOG_ERR, "<%s> can't allocate memory",
1510 __func__);
1511 goto bad;
1512 }
1513 nol->nol_opt = hdr;
1514 TAILQ_INSERT_TAIL(&(ndopts->opt_list), nol, nol_next);
1515
1516 break;
1517 }
1518 default: /* impossible */
1519 break;
1520 }
1521 }
1522
1523 return (0);
1524
1525 bad:
1526 free_ndopts(ndopts);
1527
1528 return (-1);
1529 }
1530
1531 static void
1532 free_ndopts(union nd_opt *ndopts)
1533 {
1534 struct nd_optlist *nol;
1535
1536 while ((nol = TAILQ_FIRST(&ndopts->opt_list)) != NULL) {
1537 TAILQ_REMOVE(&ndopts->opt_list, nol, nol_next);
1538 free(nol);
1539 }
1540 }
1541
1542 void
1543 sock_open(struct sockinfo *s)
1544 {
1545 struct icmp6_filter filt;
1546 int on;
1547 /* XXX: should be max MTU attached to the node */
1548 static char answer[1500];
1549
1550 syslog(LOG_DEBUG, "<%s> enter", __func__);
1551
1552 if (s == NULL) {
1553 syslog(LOG_ERR, "<%s> internal error", __func__);
1554 exit(1);
1555 }
1556 rcvcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
1557 CMSG_SPACE(sizeof(int));
1558 rcvcmsgbuf = (char *)malloc(rcvcmsgbuflen);
1559 if (rcvcmsgbuf == NULL) {
1560 syslog(LOG_ERR, "<%s> not enough core", __func__);
1561 exit(1);
1562 }
1563
1564 sndcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
1565 CMSG_SPACE(sizeof(int));
1566 sndcmsgbuf = (char *)malloc(sndcmsgbuflen);
1567 if (sndcmsgbuf == NULL) {
1568 syslog(LOG_ERR, "<%s> not enough core", __func__);
1569 exit(1);
1570 }
1571
1572 if ((s->si_fd = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
1573 syslog(LOG_ERR, "<%s> socket: %s", __func__, strerror(errno));
1574 exit(1);
1575 }
1576 /* specify to tell receiving interface */
1577 on = 1;
1578 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
1579 sizeof(on)) < 0) {
1580 syslog(LOG_ERR, "<%s> IPV6_RECVPKTINFO: %s", __func__,
1581 strerror(errno));
1582 exit(1);
1583 }
1584 on = 1;
1585 /* specify to tell value of hoplimit field of received IP6 hdr */
1586 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
1587 sizeof(on)) < 0) {
1588 syslog(LOG_ERR, "<%s> IPV6_RECVHOPLIMIT: %s", __func__,
1589 strerror(errno));
1590 exit(1);
1591 }
1592 ICMP6_FILTER_SETBLOCKALL(&filt);
1593 ICMP6_FILTER_SETPASS(ND_ROUTER_SOLICIT, &filt);
1594 ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filt);
1595 if (mcastif != NULL)
1596 ICMP6_FILTER_SETPASS(ICMP6_ROUTER_RENUMBERING, &filt);
1597
1598 if (setsockopt(s->si_fd, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
1599 sizeof(filt)) < 0) {
1600 syslog(LOG_ERR, "<%s> IICMP6_FILTER: %s",
1601 __func__, strerror(errno));
1602 exit(1);
1603 }
1604
1605 /* initialize msghdr for receiving packets */
1606 rcviov[0].iov_base = (caddr_t)answer;
1607 rcviov[0].iov_len = sizeof(answer);
1608 rcvmhdr.msg_name = (caddr_t)&rcvfrom;
1609 rcvmhdr.msg_namelen = sizeof(rcvfrom);
1610 rcvmhdr.msg_iov = rcviov;
1611 rcvmhdr.msg_iovlen = 1;
1612 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
1613 rcvmhdr.msg_controllen = rcvcmsgbuflen;
1614
1615 /* initialize msghdr for sending packets */
1616 sndmhdr.msg_namelen = sizeof(struct sockaddr_in6);
1617 sndmhdr.msg_iov = sndiov;
1618 sndmhdr.msg_iovlen = 1;
1619 sndmhdr.msg_control = (caddr_t)sndcmsgbuf;
1620 sndmhdr.msg_controllen = sndcmsgbuflen;
1621
1622 return;
1623 }
1624
1625 /* open a routing socket to watch the routing table */
1626 static void
1627 rtsock_open(struct sockinfo *s)
1628 {
1629 if (s == NULL) {
1630 syslog(LOG_ERR, "<%s> internal error", __func__);
1631 exit(1);
1632 }
1633 if ((s->si_fd = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
1634 syslog(LOG_ERR,
1635 "<%s> socket: %s", __func__, strerror(errno));
1636 exit(1);
1637 }
1638 }
1639
1640 struct ifinfo *
1641 if_indextoifinfo(int idx)
1642 {
1643 struct ifinfo *ifi;
1644 char name0[IFNAMSIZ];
1645
1646 /* Check if the interface has a valid name or not. */
1647 if (if_indextoname(idx, name0) == NULL)
1648 return (NULL);
1649
1650 TAILQ_FOREACH(ifi, &ifilist, ifi_next) {
1651 if (ifi->ifi_ifindex == idx)
1652 return (ifi);
1653 }
1654
1655 if (ifi != NULL)
1656 syslog(LOG_DEBUG, "<%s> ifi found (idx=%d)",
1657 __func__, idx);
1658 else
1659 syslog(LOG_DEBUG, "<%s> ifi not found (idx=%d)",
1660 __func__, idx);
1661
1662 return (NULL); /* search failed */
1663 }
1664
1665 void
1666 ra_output(struct ifinfo *ifi)
1667 {
1668 int i;
1669 struct cmsghdr *cm;
1670 struct in6_pktinfo *pi;
1671 struct soliciter *sol;
1672 struct rainfo *rai;
1673
1674 switch (ifi->ifi_state) {
1675 case IFI_STATE_CONFIGURED:
1676 rai = ifi->ifi_rainfo;
1677 break;
1678 case IFI_STATE_TRANSITIVE:
1679 rai = ifi->ifi_rainfo_trans;
1680 break;
1681 case IFI_STATE_UNCONFIGURED:
1682 syslog(LOG_DEBUG, "<%s> %s is unconfigured. "
1683 "Skip sending RAs.",
1684 __func__, ifi->ifi_ifname);
1685 return;
1686 default:
1687 rai = NULL;
1688 }
1689 if (rai == NULL) {
1690 syslog(LOG_DEBUG, "<%s> rainfo is NULL on %s."
1691 "Skip sending RAs.",
1692 __func__, ifi->ifi_ifname);
1693 return;
1694 }
1695 if (!(ifi->ifi_flags & IFF_UP)) {
1696 syslog(LOG_DEBUG, "<%s> %s is not up. "
1697 "Skip sending RAs.",
1698 __func__, ifi->ifi_ifname);
1699 return;
1700 }
1701 /*
1702 * Check lifetime, ACCEPT_RTADV flag, and ip6.forwarding.
1703 *
1704 * (lifetime == 0) = output
1705 * (lifetime != 0 && (check_accept_rtadv()) = no output
1706 *
1707 * Basically, hosts MUST NOT send Router Advertisement
1708 * messages at any time (RFC 4861, Section 6.2.3). However, it
1709 * would sometimes be useful to allow hosts to advertise some
1710 * parameters such as prefix information and link MTU. Thus,
1711 * we allow hosts to invoke rtadvd only when router lifetime
1712 * (on every advertising interface) is explicitly set
1713 * zero. (see also the above section)
1714 */
1715 syslog(LOG_DEBUG,
1716 "<%s> check lifetime=%d, ACCEPT_RTADV=%d, ip6.forwarding=%d "
1717 "on %s", __func__,
1718 rai->rai_lifetime,
1719 check_accept_rtadv(ifi->ifi_ifindex),
1720 getinet6sysctl(IPV6CTL_FORWARDING),
1721 ifi->ifi_ifname);
1722
1723 if (rai->rai_lifetime != 0) {
1724 if (getinet6sysctl(IPV6CTL_FORWARDING) == 0) {
1725 syslog(LOG_ERR,
1726 "non-zero lifetime RA "
1727 "but net.inet6.ip6.forwarding=0. "
1728 "Ignored.");
1729 return;
1730 }
1731 if (check_accept_rtadv(ifi->ifi_ifindex)) {
1732 syslog(LOG_ERR,
1733 "non-zero lifetime RA "
1734 "on RA receiving interface %s."
1735 " Ignored.", ifi->ifi_ifname);
1736 return;
1737 }
1738 }
1739
1740 make_packet(rai); /* XXX: inefficient */
1741
1742 sndmhdr.msg_name = (caddr_t)&sin6_linklocal_allnodes;
1743 sndmhdr.msg_iov[0].iov_base = (caddr_t)rai->rai_ra_data;
1744 sndmhdr.msg_iov[0].iov_len = rai->rai_ra_datalen;
1745
1746 cm = CMSG_FIRSTHDR(&sndmhdr);
1747 /* specify the outgoing interface */
1748 cm->cmsg_level = IPPROTO_IPV6;
1749 cm->cmsg_type = IPV6_PKTINFO;
1750 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
1751 pi = (struct in6_pktinfo *)CMSG_DATA(cm);
1752 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*XXX*/
1753 pi->ipi6_ifindex = ifi->ifi_ifindex;
1754
1755 /* specify the hop limit of the packet */
1756 {
1757 int hoplimit = 255;
1758
1759 cm = CMSG_NXTHDR(&sndmhdr, cm);
1760 cm->cmsg_level = IPPROTO_IPV6;
1761 cm->cmsg_type = IPV6_HOPLIMIT;
1762 cm->cmsg_len = CMSG_LEN(sizeof(int));
1763 memcpy(CMSG_DATA(cm), &hoplimit, sizeof(int));
1764 }
1765
1766 syslog(LOG_DEBUG,
1767 "<%s> send RA on %s, # of RS waitings = %d",
1768 __func__, ifi->ifi_ifname, ifi->ifi_rs_waitcount);
1769
1770 i = sendmsg(sock.si_fd, &sndmhdr, 0);
1771
1772 if (i < 0 || (size_t)i != rai->rai_ra_datalen) {
1773 if (i < 0) {
1774 syslog(LOG_ERR, "<%s> sendmsg on %s: %s",
1775 __func__, ifi->ifi_ifname,
1776 strerror(errno));
1777 }
1778 }
1779
1780 /*
1781 * unicast advertisements
1782 * XXX commented out. reason: though spec does not forbit it, unicast
1783 * advert does not really help
1784 */
1785 while ((sol = TAILQ_FIRST(&rai->rai_soliciter)) != NULL) {
1786 TAILQ_REMOVE(&rai->rai_soliciter, sol, sol_next);
1787 free(sol);
1788 }
1789
1790 /* update timestamp */
1791 clock_gettime(CLOCK_MONOTONIC_FAST, &ifi->ifi_ra_lastsent);
1792
1793 /* update counter */
1794 ifi->ifi_rs_waitcount = 0;
1795 ifi->ifi_raoutput++;
1796
1797 switch (ifi->ifi_state) {
1798 case IFI_STATE_CONFIGURED:
1799 if (ifi->ifi_burstcount > 0)
1800 ifi->ifi_burstcount--;
1801 break;
1802 case IFI_STATE_TRANSITIVE:
1803 ifi->ifi_burstcount--;
1804 if (ifi->ifi_burstcount == 0) {
1805 if (ifi->ifi_rainfo == ifi->ifi_rainfo_trans) {
1806 /* Initial burst finished. */
1807 if (ifi->ifi_rainfo_trans != NULL)
1808 ifi->ifi_rainfo_trans = NULL;
1809 }
1810
1811 /* Remove burst RA information */
1812 if (ifi->ifi_rainfo_trans != NULL) {
1813 rm_rainfo(ifi->ifi_rainfo_trans);
1814 ifi->ifi_rainfo_trans = NULL;
1815 }
1816
1817 if (ifi->ifi_rainfo != NULL) {
1818 /*
1819 * TRANSITIVE -> CONFIGURED
1820 *
1821 * After initial burst or transition from
1822 * one configuration to another,
1823 * ifi_rainfo always points to the next RA
1824 * information.
1825 */
1826 ifi->ifi_state = IFI_STATE_CONFIGURED;
1827 syslog(LOG_DEBUG,
1828 "<%s> ifname=%s marked as "
1829 "CONFIGURED.", __func__,
1830 ifi->ifi_ifname);
1831 } else {
1832 /*
1833 * TRANSITIVE -> UNCONFIGURED
1834 *
1835 * If ifi_rainfo points to NULL, this
1836 * interface is shutting down.
1837 *
1838 */
1839 int error;
1840
1841 ifi->ifi_state = IFI_STATE_UNCONFIGURED;
1842 syslog(LOG_DEBUG,
1843 "<%s> ifname=%s marked as "
1844 "UNCONFIGURED.", __func__,
1845 ifi->ifi_ifname);
1846 error = sock_mc_leave(&sock,
1847 ifi->ifi_ifindex);
1848 if (error)
1849 exit(1);
1850 }
1851 }
1852 break;
1853 }
1854 }
1855
1856 /* process RA timer */
1857 struct rtadvd_timer *
1858 ra_timeout(void *arg)
1859 {
1860 struct ifinfo *ifi;
1861
1862 ifi = (struct ifinfo *)arg;
1863 syslog(LOG_DEBUG, "<%s> RA timer on %s is expired",
1864 __func__, ifi->ifi_ifname);
1865
1866 ra_output(ifi);
1867
1868 return (ifi->ifi_ra_timer);
1869 }
1870
1871 /* update RA timer */
1872 void
1873 ra_timer_update(void *arg, struct timespec *tm)
1874 {
1875 uint16_t interval;
1876 struct rainfo *rai;
1877 struct ifinfo *ifi;
1878
1879 ifi = (struct ifinfo *)arg;
1880 rai = ifi->ifi_rainfo;
1881 interval = 0;
1882
1883 switch (ifi->ifi_state) {
1884 case IFI_STATE_UNCONFIGURED:
1885 return;
1886 break;
1887 case IFI_STATE_CONFIGURED:
1888 /*
1889 * Whenever a multicast advertisement is sent from
1890 * an interface, the timer is reset to a
1891 * uniformly-distributed random value between the
1892 * interface's configured MinRtrAdvInterval and
1893 * MaxRtrAdvInterval (RFC4861 6.2.4).
1894 */
1895 interval = rai->rai_mininterval;
1896 #ifdef HAVE_ARC4RANDOM
1897 interval += arc4random_uniform(rai->rai_maxinterval -
1898 rai->rai_mininterval);
1899 #else
1900 interval += random() % (rai->rai_maxinterval -
1901 rai->rai_mininterval);
1902 #endif
1903 break;
1904 case IFI_STATE_TRANSITIVE:
1905 /*
1906 * For the first few advertisements (up to
1907 * MAX_INITIAL_RTR_ADVERTISEMENTS), if the randomly chosen
1908 * interval is greater than
1909 * MAX_INITIAL_RTR_ADVERT_INTERVAL, the timer SHOULD be
1910 * set to MAX_INITIAL_RTR_ADVERT_INTERVAL instead. (RFC
1911 * 4861 6.2.4)
1912 *
1913 * In such cases, the router SHOULD transmit one or more
1914 * (but not more than MAX_FINAL_RTR_ADVERTISEMENTS) final
1915 * multicast Router Advertisements on the interface with a
1916 * Router Lifetime field of zero. (RFC 4861 6.2.5)
1917 */
1918 interval = ifi->ifi_burstinterval;
1919 break;
1920 }
1921
1922 tm->tv_sec = interval;
1923 tm->tv_nsec = 0;
1924
1925 syslog(LOG_DEBUG,
1926 "<%s> RA timer on %s is set to %ld:%ld",
1927 __func__, ifi->ifi_ifname,
1928 (long int)tm->tv_sec, (long int)tm->tv_nsec / 1000);
1929
1930 return;
1931 }
DragonFly BSD