2 /* $KAME: rtadvd.c,v 1.82 2003/08/05 12:34:23 itojun Exp $ */
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * Copyright (C) 2011 Hiroki Sato <hrs@FreeBSD.org>
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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.
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
34 #include <sys/param.h>
35 #include <sys/ioctl.h>
36 #include <sys/socket.h>
39 #include <sys/queue.h>
41 #include <sys/sysctl.h>
44 #include <net/if_types.h>
45 #include <net/if_media.h>
46 #include <net/if_dl.h>
47 #include <net/route.h>
48 #include <netinet/in.h>
49 #include <netinet/ip6.h>
50 #include <netinet6/ip6_var.h>
51 #include <netinet/icmp6.h>
53 #include <arpa/inet.h>
55 #include <net/if_var.h>
56 #include <netinet/in_var.h>
57 #include <netinet6/nd6.h>
73 #include "pathnames.h"
78 #include "timer_subr.h"
82 #include "control_server.h"
84 #define RTADV_TYPE2BITMASK(type) (0x1 << type)
86 struct msghdr rcvmhdr;
87 static char *rcvcmsgbuf;
88 static size_t rcvcmsgbuflen;
89 static char *sndcmsgbuf = NULL;
90 static size_t sndcmsgbuflen;
91 struct msghdr sndmhdr;
92 struct iovec rcviov[2];
93 struct iovec sndiov[2];
94 struct sockaddr_in6 rcvfrom;
95 static const char *pidfilename = _PATH_RTADVDPID;
96 const char *conffile = _PATH_RTADVDCONF;
97 static struct pidfh *pfh;
98 static int dflag, sflag;
99 static int wait_shutdown;
101 #define PFD_RAWSOCK 0
106 struct railist_head_t railist =
107 TAILQ_HEAD_INITIALIZER(railist);
108 struct ifilist_head_t ifilist =
109 TAILQ_HEAD_INITIALIZER(ifilist);
112 TAILQ_ENTRY(nd_optlist) nol_next;
113 struct nd_opt_hdr *nol_opt;
116 struct nd_opt_hdr *opt_array[9];
118 struct nd_opt_hdr *zero;
119 struct nd_opt_hdr *src_lladdr;
120 struct nd_opt_hdr *tgt_lladdr;
121 struct nd_opt_prefix_info *pi;
122 struct nd_opt_rd_hdr *rh;
123 struct nd_opt_mtu *mtu;
124 TAILQ_HEAD(, nd_optlist) opt_list;
127 #define opt_src_lladdr nd_opt_each.src_lladdr
128 #define opt_tgt_lladdr nd_opt_each.tgt_lladdr
129 #define opt_pi nd_opt_each.pi
130 #define opt_rh nd_opt_each.rh
131 #define opt_mtu nd_opt_each.mtu
132 #define opt_list nd_opt_each.opt_list
134 #define NDOPT_FLAG_SRCLINKADDR (1 << 0)
135 #define NDOPT_FLAG_TGTLINKADDR (1 << 1)
136 #define NDOPT_FLAG_PREFIXINFO (1 << 2)
137 #define NDOPT_FLAG_RDHDR (1 << 3)
138 #define NDOPT_FLAG_MTU (1 << 4)
139 #define NDOPT_FLAG_RDNSS (1 << 5)
140 #define NDOPT_FLAG_DNSSL (1 << 6)
142 static uint32_t ndopt_flags[] = {
143 [ND_OPT_SOURCE_LINKADDR] = NDOPT_FLAG_SRCLINKADDR,
144 [ND_OPT_TARGET_LINKADDR] = NDOPT_FLAG_TGTLINKADDR,
145 [ND_OPT_PREFIX_INFORMATION] = NDOPT_FLAG_PREFIXINFO,
146 [ND_OPT_REDIRECTED_HEADER] = NDOPT_FLAG_RDHDR,
147 [ND_OPT_MTU] = NDOPT_FLAG_MTU,
148 [ND_OPT_RDNSS] = NDOPT_FLAG_RDNSS,
149 [ND_OPT_DNSSL] = NDOPT_FLAG_DNSSL,
152 static void rtadvd_shutdown(void);
153 static void sock_open(struct sockinfo *);
154 static void rtsock_open(struct sockinfo *);
155 static void rtadvd_input(struct sockinfo *);
156 static void rs_input(int, struct nd_router_solicit *,
157 struct in6_pktinfo *, struct sockaddr_in6 *);
158 static void ra_input(int, struct nd_router_advert *,
159 struct in6_pktinfo *, struct sockaddr_in6 *);
160 static int prefix_check(struct nd_opt_prefix_info *, struct rainfo *,
161 struct sockaddr_in6 *);
162 static int nd6_options(struct nd_opt_hdr *, int,
163 union nd_opt *, uint32_t);
164 static void free_ndopts(union nd_opt *);
165 static void rtmsg_input(struct sockinfo *);
166 static void set_short_delay(struct ifinfo *);
167 static int check_accept_rtadv(int);
173 fprintf(stderr, "usage: rtadvd [-dDfRs] "
174 "[-c configfile] [-C ctlsock] [-M ifname] [-p pidfile]\n");
179 main(int argc, char *argv[])
181 struct pollfd set[PFD_MAX];
182 struct timeval *timeout;
184 int fflag = 0, logopt;
188 /* get command line options and arguments */
189 while ((ch = getopt(argc, argv, "c:C:dDfhM:p:Rs")) != -1) {
195 ctrlsock.si_name = optarg;
210 fprintf(stderr, "rtadvd: "
211 "the -R option is currently ignored.\n");
219 pidfilename = optarg;
228 logopt = LOG_NDELAY | LOG_PID;
230 logopt |= LOG_PERROR;
231 openlog("rtadvd", logopt, LOG_DAEMON);
235 (void)setlogmask(LOG_UPTO(LOG_DEBUG));
237 (void)setlogmask(LOG_UPTO(LOG_INFO));
239 (void)setlogmask(LOG_UPTO(LOG_NOTICE));
241 (void)setlogmask(LOG_UPTO(LOG_ERR));
243 /* timer initialization */
246 #ifndef HAVE_ARC4RANDOM
247 /* random value initialization */
251 srandom((unsigned long)time(NULL));
254 pfh = pidfile_open(pidfilename, 0600, &otherpid);
257 errx(1, "%s already running, pid: %d",
258 getprogname(), otherpid);
260 "failed to open the pid file %s, run anyway.",
268 update_ifinfo(&ifilist, UPDATE_IFINFO_ALL);
269 for (i = 0; i < argc; i++)
270 update_persist_ifinfo(&ifilist, argv[i]);
272 csock_open(&ctrlsock, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
273 if (ctrlsock.si_fd == -1) {
274 syslog(LOG_ERR, "cannot open control socket: %s",
279 /* record the current PID */
283 set[PFD_RAWSOCK].fd = sock.si_fd;
284 set[PFD_RAWSOCK].events = POLLIN;
286 rtsock_open(&rtsock);
287 set[PFD_RTSOCK].fd = rtsock.si_fd;
288 set[PFD_RTSOCK].events = POLLIN;
290 set[PFD_RTSOCK].fd = -1;
291 set[PFD_CSOCK].fd = ctrlsock.si_fd;
292 set[PFD_CSOCK].events = POLLIN;
293 signal(SIGTERM, set_do_shutdown);
294 signal(SIGINT, set_do_shutdown);
295 signal(SIGHUP, set_do_reload);
297 error = csock_listen(&ctrlsock);
299 syslog(LOG_ERR, "cannot listen control socket: %s",
304 /* load configuration file */
308 if (is_do_shutdown())
311 if (is_do_reload()) {
312 loadconfig_ifname(reload_ifname());
313 if (reload_ifname() == NULL)
315 "configuration file reloaded.");
318 "configuration file for %s reloaded.",
323 /* timeout handler update for active interfaces */
324 rtadvd_update_timeout_handler();
326 /* timer expiration check and reset the timer */
327 timeout = rtadvd_check_timer();
329 if (timeout != NULL) {
331 "<%s> set timer to %ld:%ld. waiting for "
332 "inputs or timeout", __func__,
333 (long int)timeout->tv_sec,
334 (long int)timeout->tv_usec);
337 "<%s> there's no timer. waiting for inputs",
340 if ((i = poll(set, sizeof(set)/sizeof(set[0]),
341 timeout ? (timeout->tv_sec * 1000 +
342 timeout->tv_usec / 1000) : INFTIM)) < 0) {
344 /* EINTR would occur if a signal was delivered */
346 syslog(LOG_ERR, "poll() failed: %s",
350 if (i == 0) /* timeout */
352 if (rtsock.si_fd != -1 && set[PFD_RTSOCK].revents & POLLIN)
353 rtmsg_input(&rtsock);
355 if (set[PFD_RAWSOCK].revents & POLLIN)
358 if (set[PFD_CSOCK].revents & POLLIN) {
361 fd = csock_accept(&ctrlsock);
364 "cannot accept() control socket: %s",
367 cm_handler_server(fd);
372 exit(0); /* NOTREACHED */
376 rtadvd_shutdown(void)
385 "waiting expiration of the all RA timers.");
387 TAILQ_FOREACH(ifi, &ifilist, ifi_next) {
389 * Ignore !IFF_UP interfaces in waiting for shutdown.
391 if (!(ifi->ifi_flags & IFF_UP) &&
392 ifi->ifi_ra_timer != NULL) {
393 ifi->ifi_state = IFI_STATE_UNCONFIGURED;
394 rtadvd_remove_timer(ifi->ifi_ra_timer);
395 ifi->ifi_ra_timer = NULL;
396 syslog(LOG_DEBUG, "<%s> %s(idx=%d) is down. "
397 "Timer removed and marked as UNCONFIGURED.",
398 __func__, ifi->ifi_ifname,
402 TAILQ_FOREACH(ifi, &ifilist, ifi_next) {
403 if (ifi->ifi_ra_timer != NULL)
407 syslog(LOG_NOTICE, "gracefully terminated.");
415 syslog(LOG_DEBUG, "<%s> cease to be an advertising router",
420 TAILQ_FOREACH(rai, &railist, rai_next) {
421 rai->rai_lifetime = 0;
422 TAILQ_FOREACH(rdn, &rai->rai_rdnss, rd_next)
424 TAILQ_FOREACH(dns, &rai->rai_dnssl, dn_next)
427 TAILQ_FOREACH(ifi, &ifilist, ifi_next) {
428 if (!ifi->ifi_persist)
430 if (ifi->ifi_state == IFI_STATE_UNCONFIGURED)
432 if (ifi->ifi_ra_timer == NULL)
434 if (ifi->ifi_ra_lastsent.tv_sec == 0 &&
435 ifi->ifi_ra_lastsent.tv_usec == 0 &&
436 ifi->ifi_ra_timer != NULL) {
438 * When RA configured but never sent,
439 * ignore the IF immediately.
441 rtadvd_remove_timer(ifi->ifi_ra_timer);
442 ifi->ifi_ra_timer = NULL;
443 ifi->ifi_state = IFI_STATE_UNCONFIGURED;
447 ifi->ifi_state = IFI_STATE_TRANSITIVE;
449 /* Mark as the shut-down state. */
450 ifi->ifi_rainfo_trans = ifi->ifi_rainfo;
451 ifi->ifi_rainfo = NULL;
453 ifi->ifi_burstcount = MAX_FINAL_RTR_ADVERTISEMENTS;
454 ifi->ifi_burstinterval = MIN_DELAY_BETWEEN_RAS;
456 ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm);
457 rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm,
460 syslog(LOG_NOTICE, "final RA transmission started.");
463 csock_close(&ctrlsock);
467 rtmsg_input(struct sockinfo *s)
469 int n, type, ifindex = 0, plen;
471 char msg[2048], *next, *lim;
472 char ifname[IFNAMSIZ];
473 struct if_announcemsghdr *ifan;
474 struct rt_msghdr *rtm;
477 struct in6_addr *addr;
479 char addrbuf[INET6_ADDRSTRLEN];
480 int prefixchange = 0;
483 syslog(LOG_ERR, "<%s> internal error", __func__);
486 n = read(s->si_fd, msg, sizeof(msg));
487 rtm = (struct rt_msghdr *)msg;
488 syslog(LOG_DEBUG, "<%s> received a routing message "
489 "(type = %d, len = %d)", __func__, rtm->rtm_type, n);
491 if (n > rtm->rtm_msglen) {
493 * This usually won't happen for messages received on
497 "<%s> received data length is larger than "
498 "1st routing message len. multiple messages? "
499 "read %d bytes, but 1st msg len = %d",
500 __func__, n, rtm->rtm_msglen);
508 for (next = msg; next < lim; next += len) {
511 next = get_next_msg(next, lim, 0, &len,
512 RTADV_TYPE2BITMASK(RTM_ADD) |
513 RTADV_TYPE2BITMASK(RTM_DELETE) |
514 RTADV_TYPE2BITMASK(RTM_NEWADDR) |
515 RTADV_TYPE2BITMASK(RTM_DELADDR) |
516 RTADV_TYPE2BITMASK(RTM_IFINFO) |
517 RTADV_TYPE2BITMASK(RTM_IFANNOUNCE));
520 type = ((struct rt_msghdr *)next)->rtm_type;
524 ifindex = get_rtm_ifindex(next);
528 ifindex = (int)((struct ifa_msghdr *)next)->ifam_index;
531 ifindex = (int)((struct if_msghdr *)next)->ifm_index;
534 ifan = (struct if_announcemsghdr *)next;
535 switch (ifan->ifan_what) {
541 "<%s:%d> unknown ifan msg (ifan_what=%d)",
542 __func__, __LINE__, ifan->ifan_what);
546 syslog(LOG_DEBUG, "<%s>: if_announcemsg (idx=%d:%d)",
547 __func__, ifan->ifan_index, ifan->ifan_what);
548 switch (ifan->ifan_what) {
551 "interface added (idx=%d)",
553 update_ifinfo(&ifilist, ifan->ifan_index);
554 loadconfig_index(ifan->ifan_index);
558 "interface removed (idx=%d)",
560 rm_ifinfo_index(ifan->ifan_index);
562 /* Clear ifi_ifindex */
563 TAILQ_FOREACH(ifi, &ifilist, ifi_next) {
565 == ifan->ifan_index) {
566 ifi->ifi_ifindex = 0;
570 update_ifinfo(&ifilist, ifan->ifan_index);
575 /* should not reach here */
577 "<%s:%d> unknown rtmsg %d on %s",
578 __func__, __LINE__, type,
579 if_indextoname(ifindex, ifname));
582 ifi = if_indextoifinfo(ifindex);
585 "<%s> ifinfo not found for idx=%d. Why?",
589 rai = ifi->ifi_rainfo;
592 "<%s> route changed on "
593 "non advertising interface(%s)",
594 __func__, ifi->ifi_ifname);
598 oldifflags = ifi->ifi_flags;
599 /* init ifflags because it may have changed */
600 update_ifinfo(&ifilist, ifindex);
605 break; /* we aren't interested in prefixes */
607 addr = get_addr(msg);
608 plen = get_prefixlen(msg);
609 /* sanity check for plen */
610 /* as RFC2373, prefixlen is at least 4 */
611 if (plen < 4 || plen > 127) {
612 syslog(LOG_INFO, "<%s> new interface route's"
613 "plen %d is invalid for a prefix",
617 pfx = find_prefix(rai, addr, plen);
619 if (pfx->pfx_timer) {
621 * If the prefix has been invalidated,
622 * make it available again.
628 "<%s> new prefix(%s/%d) "
630 "but it was already in list",
632 inet_ntop(AF_INET6, addr,
635 plen, ifi->ifi_ifname);
638 make_prefix(rai, ifindex, addr, plen);
645 addr = get_addr(msg);
646 plen = get_prefixlen(msg);
647 /* sanity check for plen */
648 /* as RFC2373, prefixlen is at least 4 */
649 if (plen < 4 || plen > 127) {
651 "<%s> deleted interface route's "
652 "plen %d is invalid for a prefix",
656 pfx = find_prefix(rai, addr, plen);
659 "<%s> prefix(%s/%d) was deleted on %s, "
660 "but it was not in list",
661 __func__, inet_ntop(AF_INET6, addr,
662 (char *)addrbuf, sizeof(addrbuf)),
663 plen, ifi->ifi_ifname);
666 invalidate_prefix(pfx);
674 /* should not reach here */
676 "<%s:%d> unknown rtmsg %d on %s",
677 __func__, __LINE__, type,
678 if_indextoname(ifindex, ifname));
682 /* check if an interface flag is changed */
683 if ((oldifflags & IFF_UP) && /* UP to DOWN */
684 !(ifi->ifi_flags & IFF_UP)) {
686 "<interface %s becomes down. stop timer.",
688 rtadvd_remove_timer(ifi->ifi_ra_timer);
689 ifi->ifi_ra_timer = NULL;
690 } else if (!(oldifflags & IFF_UP) && /* DOWN to UP */
691 (ifi->ifi_flags & IFF_UP)) {
693 "interface %s becomes up. restart timer.",
696 ifi->ifi_state = IFI_STATE_TRANSITIVE;
697 ifi->ifi_burstcount =
698 MAX_INITIAL_RTR_ADVERTISEMENTS;
699 ifi->ifi_burstinterval =
700 MAX_INITIAL_RTR_ADVERT_INTERVAL;
702 ifi->ifi_ra_timer = rtadvd_add_timer(ra_timeout,
703 ra_timer_update, ifi, ifi);
704 ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm);
705 rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm,
707 } else if (prefixchange &&
708 (ifi->ifi_flags & IFF_UP)) {
710 * An advertised prefix has been added or invalidated.
711 * Will notice the change in a short delay.
713 set_short_delay(ifi);
721 rtadvd_input(struct sockinfo *s)
728 struct icmp6_hdr *icp;
731 struct in6_pktinfo *pi = NULL;
732 char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
733 struct in6_addr dst = in6addr_any;
736 syslog(LOG_DEBUG, "<%s> enter", __func__);
739 syslog(LOG_ERR, "<%s> internal error", __func__);
743 * Get message. We reset msg_controllen since the field could
744 * be modified if we had received a message before setting
747 rcvmhdr.msg_controllen = rcvcmsgbuflen;
748 if ((i = recvmsg(s->si_fd, &rcvmhdr, 0)) < 0)
751 /* extract optional information via Advanced API */
752 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&rcvmhdr);
754 cm = (struct cmsghdr *)CMSG_NXTHDR(&rcvmhdr, cm)) {
755 if (cm->cmsg_level == IPPROTO_IPV6 &&
756 cm->cmsg_type == IPV6_PKTINFO &&
757 cm->cmsg_len == CMSG_LEN(sizeof(struct in6_pktinfo))) {
758 pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
759 ifindex = pi->ipi6_ifindex;
762 if (cm->cmsg_level == IPPROTO_IPV6 &&
763 cm->cmsg_type == IPV6_HOPLIMIT &&
764 cm->cmsg_len == CMSG_LEN(sizeof(int)))
765 hlimp = (int *)CMSG_DATA(cm);
768 syslog(LOG_ERR, "failed to get receiving interface");
772 syslog(LOG_ERR, "failed to get receiving hop limit");
777 * If we happen to receive data on an interface which is now gone
778 * or down, just discard the data.
780 ifi = if_indextoifinfo(pi->ipi6_ifindex);
781 if (ifi == NULL || !(ifi->ifi_flags & IFF_UP)) {
783 "<%s> received data on a disabled interface (%s)",
785 (ifi == NULL) ? "[gone]" : ifi->ifi_ifname);
790 if ((size_t)i < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr)) {
792 "packet size(%d) is too short", i);
796 ip = (struct ip6_hdr *)rcvmhdr.msg_iov[0].iov_base;
797 icp = (struct icmp6_hdr *)(ip + 1); /* XXX: ext. hdr? */
799 if ((size_t)i < sizeof(struct icmp6_hdr)) {
800 syslog(LOG_ERR, "packet size(%zd) is too short", i);
804 icp = (struct icmp6_hdr *)rcvmhdr.msg_iov[0].iov_base;
807 switch (icp->icmp6_type) {
808 case ND_ROUTER_SOLICIT:
810 * Message verification - RFC 4861 6.1.1
811 * XXX: these checks must be done in the kernel as well,
812 * but we can't completely rely on them.
816 "RS with invalid hop limit(%d) "
817 "received from %s on %s",
819 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
821 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
824 if (icp->icmp6_code) {
826 "RS with invalid ICMP6 code(%d) "
827 "received from %s on %s",
829 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
831 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
834 if ((size_t)i < sizeof(struct nd_router_solicit)) {
836 "RS from %s on %s does not have enough "
837 "length (len = %zd)",
838 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
840 if_indextoname(pi->ipi6_ifindex, ifnamebuf), i);
843 rs_input(i, (struct nd_router_solicit *)icp, pi, &rcvfrom);
845 case ND_ROUTER_ADVERT:
847 * Message verification - RFC 4861 6.1.2
848 * XXX: there's the same dilemma as above...
850 if (!IN6_IS_ADDR_LINKLOCAL(&rcvfrom.sin6_addr)) {
852 "RA witn non-linklocal source address "
853 "received from %s on %s",
854 inet_ntop(AF_INET6, &rcvfrom.sin6_addr,
855 ntopbuf, sizeof(ntopbuf)),
856 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
861 "RA with invalid hop limit(%d) "
862 "received from %s on %s",
864 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
866 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
869 if (icp->icmp6_code) {
871 "RA with invalid ICMP6 code(%d) "
872 "received from %s on %s",
874 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
876 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
879 if ((size_t)i < sizeof(struct nd_router_advert)) {
881 "RA from %s on %s does not have enough "
882 "length (len = %zd)",
883 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
885 if_indextoname(pi->ipi6_ifindex, ifnamebuf), i);
888 ra_input(i, (struct nd_router_advert *)icp, pi, &rcvfrom);
890 case ICMP6_ROUTER_RENUMBERING:
891 if (mcastif == NULL) {
892 syslog(LOG_ERR, "received a router renumbering "
893 "message, but not allowed to be accepted");
896 rr_input(i, (struct icmp6_router_renum *)icp, pi, &rcvfrom,
901 * Note that this case is POSSIBLE, especially just
902 * after invocation of the daemon. This is because we
903 * could receive message after opening the socket and
904 * before setting ICMP6 type filter(see sock_open()).
906 syslog(LOG_ERR, "invalid icmp type(%d)", icp->icmp6_type);
914 rs_input(int len, struct nd_router_solicit *rs,
915 struct in6_pktinfo *pi, struct sockaddr_in6 *from)
917 char ntopbuf[INET6_ADDRSTRLEN];
918 char ifnamebuf[IFNAMSIZ];
922 struct soliciter *sol;
925 "<%s> RS received from %s on %s",
927 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)),
928 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
930 /* ND option check */
931 memset(&ndopts, 0, sizeof(ndopts));
932 TAILQ_INIT(&ndopts.opt_list);
933 if (nd6_options((struct nd_opt_hdr *)(rs + 1),
934 len - sizeof(struct nd_router_solicit),
935 &ndopts, NDOPT_FLAG_SRCLINKADDR)) {
937 "<%s> ND option check failed for an RS from %s on %s",
939 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
941 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
946 * If the IP source address is the unspecified address, there
947 * must be no source link-layer address option in the message.
950 if (IN6_IS_ADDR_UNSPECIFIED(&from->sin6_addr) &&
951 ndopts.opt_src_lladdr) {
953 "<%s> RS from unspecified src on %s has a link-layer"
955 __func__, if_indextoname(pi->ipi6_ifindex, ifnamebuf));
959 ifi = if_indextoifinfo(pi->ipi6_ifindex);
962 "<%s> if (idx=%d) not found. Why?",
963 __func__, pi->ipi6_ifindex);
966 rai = ifi->ifi_rainfo;
969 "<%s> RS received on non advertising interface(%s)",
971 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
975 rai->rai_ifinfo->ifi_rsinput++;
978 * Decide whether to send RA according to the rate-limit
982 /* record sockaddr waiting for RA, if possible */
983 sol = (struct soliciter *)malloc(sizeof(*sol));
985 sol->sol_addr = *from;
986 /* XXX RFC 2553 need clarification on flowinfo */
987 sol->sol_addr.sin6_flowinfo = 0;
988 TAILQ_INSERT_TAIL(&rai->rai_soliciter, sol, sol_next);
992 * If there is already a waiting RS packet, don't
995 if (ifi->ifi_rs_waitcount++)
998 set_short_delay(ifi);
1001 free_ndopts(&ndopts);
1006 set_short_delay(struct ifinfo *ifi)
1008 long delay; /* must not be greater than 1000000 */
1009 struct timeval interval, now, min_delay, tm_tmp, *rest;
1011 if (ifi->ifi_ra_timer == NULL)
1014 * Compute a random delay. If the computed value
1015 * corresponds to a time later than the time the next
1016 * multicast RA is scheduled to be sent, ignore the random
1017 * delay and send the advertisement at the
1018 * already-scheduled time. RFC 4861 6.2.6
1020 #ifdef HAVE_ARC4RANDOM
1021 delay = arc4random_uniform(MAX_RA_DELAY_TIME);
1023 delay = random() % MAX_RA_DELAY_TIME;
1025 interval.tv_sec = 0;
1026 interval.tv_usec = delay;
1027 rest = rtadvd_timer_rest(ifi->ifi_ra_timer);
1028 if (TIMEVAL_LT(rest, &interval)) {
1029 syslog(LOG_DEBUG, "<%s> random delay is larger than "
1030 "the rest of the current timer", __func__);
1035 * If we sent a multicast Router Advertisement within
1036 * the last MIN_DELAY_BETWEEN_RAS seconds, schedule
1037 * the advertisement to be sent at a time corresponding to
1038 * MIN_DELAY_BETWEEN_RAS plus the random value after the
1039 * previous advertisement was sent.
1041 gettimeofday(&now, NULL);
1042 TIMEVAL_SUB(&now, &ifi->ifi_ra_lastsent, &tm_tmp);
1043 min_delay.tv_sec = MIN_DELAY_BETWEEN_RAS;
1044 min_delay.tv_usec = 0;
1045 if (TIMEVAL_LT(&tm_tmp, &min_delay)) {
1046 TIMEVAL_SUB(&min_delay, &tm_tmp, &min_delay);
1047 TIMEVAL_ADD(&min_delay, &interval, &interval);
1049 rtadvd_set_timer(&interval, ifi->ifi_ra_timer);
1053 check_accept_rtadv(int idx)
1057 TAILQ_FOREACH(ifi, &ifilist, ifi_next) {
1058 if (ifi->ifi_ifindex == idx)
1063 "<%s> if (idx=%d) not found. Why?",
1067 #if (__FreeBSD_version < 900000)
1069 * RA_RECV: !ip6.forwarding && ip6.accept_rtadv
1070 * RA_SEND: ip6.forwarding
1072 return ((getinet6sysctl(IPV6CTL_FORWARDING) == 0) &&
1073 (getinet6sysctl(IPV6CTL_ACCEPT_RTADV) == 1));
1076 * RA_RECV: ND6_IFF_ACCEPT_RTADV
1077 * RA_SEND: ip6.forwarding
1079 if (update_ifinfo_nd_flags(ifi) != 0) {
1080 syslog(LOG_ERR, "cannot get nd6 flags (idx=%d)", idx);
1084 return (ifi->ifi_nd_flags & ND6_IFF_ACCEPT_RTADV);
1089 ra_input(int len, struct nd_router_advert *nra,
1090 struct in6_pktinfo *pi, struct sockaddr_in6 *from)
1094 char ntopbuf[INET6_ADDRSTRLEN];
1095 char ifnamebuf[IFNAMSIZ];
1096 union nd_opt ndopts;
1097 const char *on_off[] = {"OFF", "ON"};
1098 uint32_t reachabletime, retranstimer, mtu;
1099 int inconsistent = 0;
1102 syslog(LOG_DEBUG, "<%s> RA received from %s on %s", __func__,
1103 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)),
1104 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
1106 /* ND option check */
1107 memset(&ndopts, 0, sizeof(ndopts));
1108 TAILQ_INIT(&ndopts.opt_list);
1109 error = nd6_options((struct nd_opt_hdr *)(nra + 1),
1110 len - sizeof(struct nd_router_advert), &ndopts,
1111 NDOPT_FLAG_SRCLINKADDR | NDOPT_FLAG_PREFIXINFO | NDOPT_FLAG_MTU |
1112 NDOPT_FLAG_RDNSS | NDOPT_FLAG_DNSSL);
1115 "<%s> ND option check failed for an RA from %s on %s",
1117 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1118 sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex,
1124 * RA consistency check according to RFC 4861 6.2.7
1126 ifi = if_indextoifinfo(pi->ipi6_ifindex);
1127 if (ifi->ifi_rainfo == NULL) {
1129 "<%s> received RA from %s on non-advertising"
1132 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1133 sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex,
1137 rai = ifi->ifi_rainfo;
1139 syslog(LOG_DEBUG, "<%s> ifi->ifi_rainput = %" PRIu64, __func__,
1142 /* Cur Hop Limit value */
1143 if (nra->nd_ra_curhoplimit && rai->rai_hoplimit &&
1144 nra->nd_ra_curhoplimit != rai->rai_hoplimit) {
1146 "CurHopLimit inconsistent on %s:"
1147 " %d from %s, %d from us",
1148 ifi->ifi_ifname, nra->nd_ra_curhoplimit,
1149 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1150 sizeof(ntopbuf)), rai->rai_hoplimit);
1154 if ((nra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED) !=
1155 rai->rai_managedflg) {
1157 "M flag inconsistent on %s:"
1158 " %s from %s, %s from us",
1159 ifi->ifi_ifname, on_off[!rai->rai_managedflg],
1160 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1161 sizeof(ntopbuf)), on_off[rai->rai_managedflg]);
1165 if ((nra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER) !=
1166 rai->rai_otherflg) {
1168 "O flag inconsistent on %s:"
1169 " %s from %s, %s from us",
1170 ifi->ifi_ifname, on_off[!rai->rai_otherflg],
1171 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1172 sizeof(ntopbuf)), on_off[rai->rai_otherflg]);
1175 /* Reachable Time */
1176 reachabletime = ntohl(nra->nd_ra_reachable);
1177 if (reachabletime && rai->rai_reachabletime &&
1178 reachabletime != rai->rai_reachabletime) {
1180 "ReachableTime inconsistent on %s:"
1181 " %d from %s, %d from us",
1182 ifi->ifi_ifname, reachabletime,
1183 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1184 sizeof(ntopbuf)), rai->rai_reachabletime);
1188 retranstimer = ntohl(nra->nd_ra_retransmit);
1189 if (retranstimer && rai->rai_retranstimer &&
1190 retranstimer != rai->rai_retranstimer) {
1192 "RetranceTimer inconsistent on %s:"
1193 " %d from %s, %d from us",
1194 ifi->ifi_ifname, retranstimer,
1195 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1196 sizeof(ntopbuf)), rai->rai_retranstimer);
1199 /* Values in the MTU options */
1200 if (ndopts.opt_mtu) {
1201 mtu = ntohl(ndopts.opt_mtu->nd_opt_mtu_mtu);
1202 if (mtu && rai->rai_linkmtu && mtu != rai->rai_linkmtu) {
1204 "MTU option value inconsistent on %s:"
1205 " %d from %s, %d from us",
1206 ifi->ifi_ifname, mtu,
1207 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1208 sizeof(ntopbuf)), rai->rai_linkmtu);
1212 /* Preferred and Valid Lifetimes for prefixes */
1214 struct nd_optlist *nol;
1217 if (prefix_check(ndopts.opt_pi, rai, from))
1220 TAILQ_FOREACH(nol, &ndopts.opt_list, nol_next)
1221 if (prefix_check((struct nd_opt_prefix_info *)nol->nol_opt,
1227 ifi->ifi_rainconsistent++;
1230 free_ndopts(&ndopts);
1235 udiff(uint32_t u, uint32_t v)
1237 return (u >= v ? u - v : v - u);
1240 /* return a non-zero value if the received prefix is inconsitent with ours */
1242 prefix_check(struct nd_opt_prefix_info *pinfo,
1243 struct rainfo *rai, struct sockaddr_in6 *from)
1246 uint32_t preferred_time, valid_time;
1248 int inconsistent = 0;
1249 char ntopbuf[INET6_ADDRSTRLEN];
1250 char prefixbuf[INET6_ADDRSTRLEN];
1253 #if 0 /* impossible */
1254 if (pinfo->nd_opt_pi_type != ND_OPT_PREFIX_INFORMATION)
1257 ifi = rai->rai_ifinfo;
1259 * log if the adveritsed prefix has link-local scope(sanity check?)
1261 if (IN6_IS_ADDR_LINKLOCAL(&pinfo->nd_opt_pi_prefix))
1263 "<%s> link-local prefix %s/%d is advertised "
1266 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf,
1268 pinfo->nd_opt_pi_prefix_len,
1269 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1270 sizeof(ntopbuf)), ifi->ifi_ifname);
1272 if ((pfx = find_prefix(rai, &pinfo->nd_opt_pi_prefix,
1273 pinfo->nd_opt_pi_prefix_len)) == NULL) {
1275 "<%s> prefix %s/%d from %s on %s is not in our list",
1277 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf,
1279 pinfo->nd_opt_pi_prefix_len,
1280 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1281 sizeof(ntopbuf)), ifi->ifi_ifname);
1285 preferred_time = ntohl(pinfo->nd_opt_pi_preferred_time);
1286 if (pfx->pfx_pltimeexpire) {
1288 * The lifetime is decremented in real time, so we should
1289 * compare the expiration time.
1290 * (RFC 2461 Section 6.2.7.)
1291 * XXX: can we really expect that all routers on the link
1292 * have synchronized clocks?
1294 gettimeofday(&now, NULL);
1295 preferred_time += now.tv_sec;
1297 if (!pfx->pfx_timer && rai->rai_clockskew &&
1298 udiff(preferred_time, pfx->pfx_pltimeexpire) > rai->rai_clockskew) {
1300 "<%s> preferred lifetime for %s/%d"
1301 " (decr. in real time) inconsistent on %s:"
1302 " %" PRIu32 " from %s, %" PRIu32 " from us",
1304 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf,
1306 pinfo->nd_opt_pi_prefix_len,
1307 ifi->ifi_ifname, preferred_time,
1308 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1309 sizeof(ntopbuf)), pfx->pfx_pltimeexpire);
1312 } else if (!pfx->pfx_timer && preferred_time != pfx->pfx_preflifetime)
1314 "<%s> preferred lifetime for %s/%d"
1315 " inconsistent on %s:"
1316 " %d from %s, %d from us",
1318 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf,
1320 pinfo->nd_opt_pi_prefix_len,
1321 ifi->ifi_ifname, preferred_time,
1322 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1323 sizeof(ntopbuf)), pfx->pfx_preflifetime);
1325 valid_time = ntohl(pinfo->nd_opt_pi_valid_time);
1326 if (pfx->pfx_vltimeexpire) {
1327 gettimeofday(&now, NULL);
1328 valid_time += now.tv_sec;
1330 if (!pfx->pfx_timer && rai->rai_clockskew &&
1331 udiff(valid_time, pfx->pfx_vltimeexpire) > rai->rai_clockskew) {
1333 "<%s> valid lifetime for %s/%d"
1334 " (decr. in real time) inconsistent on %s:"
1335 " %d from %s, %" PRIu32 " from us",
1337 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf,
1339 pinfo->nd_opt_pi_prefix_len,
1340 ifi->ifi_ifname, preferred_time,
1341 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1342 sizeof(ntopbuf)), pfx->pfx_vltimeexpire);
1345 } else if (!pfx->pfx_timer && valid_time != pfx->pfx_validlifetime) {
1347 "<%s> valid lifetime for %s/%d"
1348 " inconsistent on %s:"
1349 " %d from %s, %d from us",
1351 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf,
1353 pinfo->nd_opt_pi_prefix_len,
1354 ifi->ifi_ifname, valid_time,
1355 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1356 sizeof(ntopbuf)), pfx->pfx_validlifetime);
1360 return (inconsistent);
1364 find_prefix(struct rainfo *rai, struct in6_addr *prefix, int plen)
1367 int bytelen, bitlen;
1370 TAILQ_FOREACH(pfx, &rai->rai_prefix, pfx_next) {
1371 if (plen != pfx->pfx_prefixlen)
1376 bitmask = 0xff << (8 - bitlen);
1378 if (memcmp((void *)prefix, (void *)&pfx->pfx_prefix, bytelen))
1382 ((prefix->s6_addr[bytelen] & bitmask) ==
1383 (pfx->pfx_prefix.s6_addr[bytelen] & bitmask))) {
1391 /* check if p0/plen0 matches p1/plen1; return 1 if matches, otherwise 0. */
1393 prefix_match(struct in6_addr *p0, int plen0,
1394 struct in6_addr *p1, int plen1)
1396 int bytelen, bitlen;
1402 bytelen = plen1 / 8;
1404 bitmask = 0xff << (8 - bitlen);
1406 if (memcmp((void *)p0, (void *)p1, bytelen))
1410 ((p0->s6_addr[bytelen] & bitmask) ==
1411 (p1->s6_addr[bytelen] & bitmask))) {
1419 nd6_options(struct nd_opt_hdr *hdr, int limit,
1420 union nd_opt *ndopts, uint32_t optflags)
1424 for (; limit > 0; limit -= optlen) {
1425 if ((size_t)limit < sizeof(struct nd_opt_hdr)) {
1426 syslog(LOG_INFO, "<%s> short option header", __func__);
1430 hdr = (struct nd_opt_hdr *)((caddr_t)hdr + optlen);
1431 if (hdr->nd_opt_len == 0) {
1433 "<%s> bad ND option length(0) (type = %d)",
1434 __func__, hdr->nd_opt_type);
1437 optlen = hdr->nd_opt_len << 3;
1438 if (optlen > limit) {
1439 syslog(LOG_INFO, "<%s> short option", __func__);
1443 if (hdr->nd_opt_type > ND_OPT_MTU &&
1444 hdr->nd_opt_type != ND_OPT_RDNSS &&
1445 hdr->nd_opt_type != ND_OPT_DNSSL) {
1446 syslog(LOG_INFO, "<%s> unknown ND option(type %d)",
1447 __func__, hdr->nd_opt_type);
1451 if ((ndopt_flags[hdr->nd_opt_type] & optflags) == 0) {
1452 syslog(LOG_INFO, "<%s> unexpected ND option(type %d)",
1453 __func__, hdr->nd_opt_type);
1458 * Option length check. Do it here for all fixed-length
1461 switch (hdr->nd_opt_type) {
1463 if (optlen == sizeof(struct nd_opt_mtu))
1468 (optlen - sizeof(struct nd_opt_rdnss)) % 16 == 0)
1473 (optlen - sizeof(struct nd_opt_dnssl)) % 8 == 0)
1476 case ND_OPT_PREFIX_INFORMATION:
1477 if (optlen == sizeof(struct nd_opt_prefix_info))
1480 syslog(LOG_INFO, "<%s> invalid option length",
1485 switch (hdr->nd_opt_type) {
1486 case ND_OPT_TARGET_LINKADDR:
1487 case ND_OPT_REDIRECTED_HEADER:
1490 break; /* we don't care about these options */
1491 case ND_OPT_SOURCE_LINKADDR:
1493 if (ndopts->opt_array[hdr->nd_opt_type]) {
1495 "<%s> duplicated ND option (type = %d)",
1496 __func__, hdr->nd_opt_type);
1498 ndopts->opt_array[hdr->nd_opt_type] = hdr;
1500 case ND_OPT_PREFIX_INFORMATION:
1502 struct nd_optlist *nol;
1504 if (ndopts->opt_pi == 0) {
1506 (struct nd_opt_prefix_info *)hdr;
1509 nol = malloc(sizeof(*nol));
1511 syslog(LOG_ERR, "<%s> can't allocate memory",
1516 TAILQ_INSERT_TAIL(&(ndopts->opt_list), nol, nol_next);
1520 default: /* impossible */
1528 free_ndopts(ndopts);
1534 free_ndopts(union nd_opt *ndopts)
1536 struct nd_optlist *nol;
1538 while ((nol = TAILQ_FIRST(&ndopts->opt_list)) != NULL) {
1539 TAILQ_REMOVE(&ndopts->opt_list, nol, nol_next);
1545 sock_open(struct sockinfo *s)
1547 struct icmp6_filter filt;
1549 /* XXX: should be max MTU attached to the node */
1550 static char answer[1500];
1552 syslog(LOG_DEBUG, "<%s> enter", __func__);
1555 syslog(LOG_ERR, "<%s> internal error", __func__);
1558 rcvcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
1559 CMSG_SPACE(sizeof(int));
1560 rcvcmsgbuf = (char *)malloc(rcvcmsgbuflen);
1561 if (rcvcmsgbuf == NULL) {
1562 syslog(LOG_ERR, "<%s> not enough core", __func__);
1566 sndcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
1567 CMSG_SPACE(sizeof(int));
1568 sndcmsgbuf = (char *)malloc(sndcmsgbuflen);
1569 if (sndcmsgbuf == NULL) {
1570 syslog(LOG_ERR, "<%s> not enough core", __func__);
1574 if ((s->si_fd = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
1575 syslog(LOG_ERR, "<%s> socket: %s", __func__, strerror(errno));
1578 /* specify to tell receiving interface */
1580 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
1582 syslog(LOG_ERR, "<%s> IPV6_RECVPKTINFO: %s", __func__,
1587 /* specify to tell value of hoplimit field of received IP6 hdr */
1588 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
1590 syslog(LOG_ERR, "<%s> IPV6_RECVHOPLIMIT: %s", __func__,
1594 ICMP6_FILTER_SETBLOCKALL(&filt);
1595 ICMP6_FILTER_SETPASS(ND_ROUTER_SOLICIT, &filt);
1596 ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filt);
1597 if (mcastif != NULL)
1598 ICMP6_FILTER_SETPASS(ICMP6_ROUTER_RENUMBERING, &filt);
1600 if (setsockopt(s->si_fd, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
1601 sizeof(filt)) < 0) {
1602 syslog(LOG_ERR, "<%s> IICMP6_FILTER: %s",
1603 __func__, strerror(errno));
1607 /* initialize msghdr for receiving packets */
1608 rcviov[0].iov_base = (caddr_t)answer;
1609 rcviov[0].iov_len = sizeof(answer);
1610 rcvmhdr.msg_name = (caddr_t)&rcvfrom;
1611 rcvmhdr.msg_namelen = sizeof(rcvfrom);
1612 rcvmhdr.msg_iov = rcviov;
1613 rcvmhdr.msg_iovlen = 1;
1614 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
1615 rcvmhdr.msg_controllen = rcvcmsgbuflen;
1617 /* initialize msghdr for sending packets */
1618 sndmhdr.msg_namelen = sizeof(struct sockaddr_in6);
1619 sndmhdr.msg_iov = sndiov;
1620 sndmhdr.msg_iovlen = 1;
1621 sndmhdr.msg_control = (caddr_t)sndcmsgbuf;
1622 sndmhdr.msg_controllen = sndcmsgbuflen;
1627 /* open a routing socket to watch the routing table */
1629 rtsock_open(struct sockinfo *s)
1632 syslog(LOG_ERR, "<%s> internal error", __func__);
1635 if ((s->si_fd = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
1637 "<%s> socket: %s", __func__, strerror(errno));
1643 if_indextoifinfo(int idx)
1646 char *name, name0[IFNAMSIZ];
1648 /* Check if the interface has a valid name or not. */
1649 if (if_indextoname(idx, name0) == NULL)
1652 TAILQ_FOREACH(ifi, &ifilist, ifi_next) {
1653 if (ifi->ifi_ifindex == idx)
1658 syslog(LOG_DEBUG, "<%s> ifi found (idx=%d)",
1661 syslog(LOG_DEBUG, "<%s> ifi not found (idx=%d)",
1664 return (NULL); /* search failed */
1668 ra_output(struct ifinfo *ifi)
1672 struct in6_pktinfo *pi;
1673 struct soliciter *sol;
1676 switch (ifi->ifi_state) {
1677 case IFI_STATE_CONFIGURED:
1678 rai = ifi->ifi_rainfo;
1680 case IFI_STATE_TRANSITIVE:
1681 rai = ifi->ifi_rainfo_trans;
1683 case IFI_STATE_UNCONFIGURED:
1684 syslog(LOG_DEBUG, "<%s> %s is unconfigured. "
1685 "Skip sending RAs.",
1686 __func__, ifi->ifi_ifname);
1692 syslog(LOG_DEBUG, "<%s> rainfo is NULL on %s."
1693 "Skip sending RAs.",
1694 __func__, ifi->ifi_ifname);
1697 if (!(ifi->ifi_flags & IFF_UP)) {
1698 syslog(LOG_DEBUG, "<%s> %s is not up. "
1699 "Skip sending RAs.",
1700 __func__, ifi->ifi_ifname);
1704 * Check lifetime, ACCEPT_RTADV flag, and ip6.forwarding.
1706 * (lifetime == 0) = output
1707 * (lifetime != 0 && (check_accept_rtadv()) = no output
1709 * Basically, hosts MUST NOT send Router Advertisement
1710 * messages at any time (RFC 4861, Section 6.2.3). However, it
1711 * would sometimes be useful to allow hosts to advertise some
1712 * parameters such as prefix information and link MTU. Thus,
1713 * we allow hosts to invoke rtadvd only when router lifetime
1714 * (on every advertising interface) is explicitly set
1715 * zero. (see also the above section)
1718 "<%s> check lifetime=%d, ACCEPT_RTADV=%d, ip6.forwarding=%d "
1721 check_accept_rtadv(ifi->ifi_ifindex),
1722 getinet6sysctl(IPV6CTL_FORWARDING),
1725 if (rai->rai_lifetime != 0) {
1726 if (getinet6sysctl(IPV6CTL_FORWARDING) == 0) {
1728 "non-zero lifetime RA "
1729 "but net.inet6.ip6.forwarding=0. "
1733 if (check_accept_rtadv(ifi->ifi_ifindex)) {
1735 "non-zero lifetime RA "
1736 "on RA receiving interface %s."
1737 " Ignored.", ifi->ifi_ifname);
1742 make_packet(rai); /* XXX: inefficient */
1744 sndmhdr.msg_name = (caddr_t)&sin6_linklocal_allnodes;
1745 sndmhdr.msg_iov[0].iov_base = (caddr_t)rai->rai_ra_data;
1746 sndmhdr.msg_iov[0].iov_len = rai->rai_ra_datalen;
1748 cm = CMSG_FIRSTHDR(&sndmhdr);
1749 /* specify the outgoing interface */
1750 cm->cmsg_level = IPPROTO_IPV6;
1751 cm->cmsg_type = IPV6_PKTINFO;
1752 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
1753 pi = (struct in6_pktinfo *)CMSG_DATA(cm);
1754 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*XXX*/
1755 pi->ipi6_ifindex = ifi->ifi_ifindex;
1757 /* specify the hop limit of the packet */
1761 cm = CMSG_NXTHDR(&sndmhdr, cm);
1762 cm->cmsg_level = IPPROTO_IPV6;
1763 cm->cmsg_type = IPV6_HOPLIMIT;
1764 cm->cmsg_len = CMSG_LEN(sizeof(int));
1765 memcpy(CMSG_DATA(cm), &hoplimit, sizeof(int));
1769 "<%s> send RA on %s, # of RS waitings = %d",
1770 __func__, ifi->ifi_ifname, ifi->ifi_rs_waitcount);
1772 i = sendmsg(sock.si_fd, &sndmhdr, 0);
1774 if (i < 0 || (size_t)i != rai->rai_ra_datalen) {
1776 syslog(LOG_ERR, "<%s> sendmsg on %s: %s",
1777 __func__, ifi->ifi_ifname,
1783 * unicast advertisements
1784 * XXX commented out. reason: though spec does not forbit it, unicast
1785 * advert does not really help
1787 while ((sol = TAILQ_FIRST(&rai->rai_soliciter)) != NULL) {
1788 TAILQ_REMOVE(&rai->rai_soliciter, sol, sol_next);
1792 /* update timestamp */
1793 gettimeofday(&ifi->ifi_ra_lastsent, NULL);
1795 /* update counter */
1796 ifi->ifi_rs_waitcount = 0;
1797 ifi->ifi_raoutput++;
1799 switch (ifi->ifi_state) {
1800 case IFI_STATE_CONFIGURED:
1801 if (ifi->ifi_burstcount > 0)
1802 ifi->ifi_burstcount--;
1804 case IFI_STATE_TRANSITIVE:
1805 ifi->ifi_burstcount--;
1806 if (ifi->ifi_burstcount == 0) {
1807 if (ifi->ifi_rainfo == ifi->ifi_rainfo_trans) {
1808 /* Inital burst finished. */
1809 if (ifi->ifi_rainfo_trans != NULL)
1810 ifi->ifi_rainfo_trans = NULL;
1813 /* Remove burst RA information */
1814 if (ifi->ifi_rainfo_trans != NULL) {
1815 rm_rainfo(ifi->ifi_rainfo_trans);
1816 ifi->ifi_rainfo_trans = NULL;
1819 if (ifi->ifi_rainfo != NULL) {
1821 * TRANSITIVE -> CONFIGURED
1823 * After initial burst or transition from
1824 * one configuration to another,
1825 * ifi_rainfo always points to the next RA
1828 ifi->ifi_state = IFI_STATE_CONFIGURED;
1830 "<%s> ifname=%s marked as "
1831 "CONFIGURED.", __func__,
1835 * TRANSITIVE -> UNCONFIGURED
1837 * If ifi_rainfo points to NULL, this
1838 * interface is shutting down.
1843 ifi->ifi_state = IFI_STATE_UNCONFIGURED;
1845 "<%s> ifname=%s marked as "
1846 "UNCONFIGURED.", __func__,
1848 error = sock_mc_leave(&sock,
1858 /* process RA timer */
1859 struct rtadvd_timer *
1860 ra_timeout(void *arg)
1864 ifi = (struct ifinfo *)arg;
1865 syslog(LOG_DEBUG, "<%s> RA timer on %s is expired",
1866 __func__, ifi->ifi_ifname);
1870 return (ifi->ifi_ra_timer);
1873 /* update RA timer */
1875 ra_timer_update(void *arg, struct timeval *tm)
1881 ifi = (struct ifinfo *)arg;
1882 rai = ifi->ifi_rainfo;
1885 switch (ifi->ifi_state) {
1886 case IFI_STATE_UNCONFIGURED:
1889 case IFI_STATE_CONFIGURED:
1891 * Whenever a multicast advertisement is sent from
1892 * an interface, the timer is reset to a
1893 * uniformly-distributed random value between the
1894 * interface's configured MinRtrAdvInterval and
1895 * MaxRtrAdvInterval (RFC4861 6.2.4).
1897 interval = rai->rai_mininterval;
1898 #ifdef HAVE_ARC4RANDOM
1899 interval += arc4random_uniform(rai->rai_maxinterval -
1900 rai->rai_mininterval);
1902 interval += random() % (rai->rai_maxinterval -
1903 rai->rai_mininterval);
1906 case IFI_STATE_TRANSITIVE:
1908 * For the first few advertisements (up to
1909 * MAX_INITIAL_RTR_ADVERTISEMENTS), if the randomly chosen
1910 * interval is greater than
1911 * MAX_INITIAL_RTR_ADVERT_INTERVAL, the timer SHOULD be
1912 * set to MAX_INITIAL_RTR_ADVERT_INTERVAL instead. (RFC
1915 * In such cases, the router SHOULD transmit one or more
1916 * (but not more than MAX_FINAL_RTR_ADVERTISEMENTS) final
1917 * multicast Router Advertisements on the interface with a
1918 * Router Lifetime field of zero. (RFC 4861 6.2.5)
1920 interval = ifi->ifi_burstinterval;
1924 tm->tv_sec = interval;
1928 "<%s> RA timer on %s is set to %ld:%ld",
1929 __func__, ifi->ifi_ifname,
1930 (long int)tm->tv_sec, (long int)tm->tv_usec);