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>
38 #include <sys/queue.h>
40 #include <sys/sysctl.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>
52 #include <arpa/inet.h>
54 #include <netinet/in_var.h>
55 #include <netinet6/nd6.h>
71 #include "pathnames.h"
76 #include "timer_subr.h"
80 #include "control_server.h"
82 #define RTADV_TYPE2BITMASK(type) (0x1 << type)
84 struct msghdr rcvmhdr;
85 static char *rcvcmsgbuf;
86 static size_t rcvcmsgbuflen;
87 static char *sndcmsgbuf = NULL;
88 static size_t sndcmsgbuflen;
89 struct msghdr sndmhdr;
90 struct iovec rcviov[2];
91 struct iovec sndiov[2];
92 struct sockaddr_in6 rcvfrom;
93 static const char *pidfilename = _PATH_RTADVDPID;
94 const char *conffile = _PATH_RTADVDCONF;
95 static struct pidfh *pfh;
96 static int dflag, sflag;
97 static int wait_shutdown;
104 struct railist_head_t railist =
105 TAILQ_HEAD_INITIALIZER(railist);
106 struct ifilist_head_t ifilist =
107 TAILQ_HEAD_INITIALIZER(ifilist);
110 TAILQ_ENTRY(nd_optlist) nol_next;
111 struct nd_opt_hdr *nol_opt;
114 struct nd_opt_hdr *opt_array[9];
116 struct nd_opt_hdr *zero;
117 struct nd_opt_hdr *src_lladdr;
118 struct nd_opt_hdr *tgt_lladdr;
119 struct nd_opt_prefix_info *pi;
120 struct nd_opt_rd_hdr *rh;
121 struct nd_opt_mtu *mtu;
122 TAILQ_HEAD(, nd_optlist) opt_list;
125 #define opt_src_lladdr nd_opt_each.src_lladdr
126 #define opt_tgt_lladdr nd_opt_each.tgt_lladdr
127 #define opt_pi nd_opt_each.pi
128 #define opt_rh nd_opt_each.rh
129 #define opt_mtu nd_opt_each.mtu
130 #define opt_list nd_opt_each.opt_list
132 #define NDOPT_FLAG_SRCLINKADDR (1 << 0)
133 #define NDOPT_FLAG_TGTLINKADDR (1 << 1)
134 #define NDOPT_FLAG_PREFIXINFO (1 << 2)
135 #define NDOPT_FLAG_RDHDR (1 << 3)
136 #define NDOPT_FLAG_MTU (1 << 4)
137 #define NDOPT_FLAG_RDNSS (1 << 5)
138 #define NDOPT_FLAG_DNSSL (1 << 6)
140 static uint32_t ndopt_flags[] = {
141 [ND_OPT_SOURCE_LINKADDR] = NDOPT_FLAG_SRCLINKADDR,
142 [ND_OPT_TARGET_LINKADDR] = NDOPT_FLAG_TGTLINKADDR,
143 [ND_OPT_PREFIX_INFORMATION] = NDOPT_FLAG_PREFIXINFO,
144 [ND_OPT_REDIRECTED_HEADER] = NDOPT_FLAG_RDHDR,
145 [ND_OPT_MTU] = NDOPT_FLAG_MTU,
146 [ND_OPT_RDNSS] = NDOPT_FLAG_RDNSS,
147 [ND_OPT_DNSSL] = NDOPT_FLAG_DNSSL,
150 static void rtadvd_shutdown(void);
151 static void sock_open(struct sockinfo *);
152 static void rtsock_open(struct sockinfo *);
153 static void rtadvd_input(struct sockinfo *);
154 static void rs_input(int, struct nd_router_solicit *,
155 struct in6_pktinfo *, struct sockaddr_in6 *);
156 static void ra_input(int, struct nd_router_advert *,
157 struct in6_pktinfo *, struct sockaddr_in6 *);
158 static int prefix_check(struct nd_opt_prefix_info *, struct rainfo *,
159 struct sockaddr_in6 *);
160 static int nd6_options(struct nd_opt_hdr *, int,
161 union nd_opt *, uint32_t);
162 static void free_ndopts(union nd_opt *);
163 static void rtmsg_input(struct sockinfo *);
164 static void set_short_delay(struct ifinfo *);
165 static int check_accept_rtadv(int);
171 fprintf(stderr, "usage: rtadvd [-dDfRs] "
172 "[-c configfile] [-C ctlsock] [-M ifname] [-p pidfile]\n");
177 main(int argc, char *argv[])
179 struct pollfd set[PFD_MAX];
180 struct timespec *timeout;
182 int fflag = 0, logopt;
186 /* get command line options and arguments */
187 while ((ch = getopt(argc, argv, "c:C:dDfhM:p:Rs")) != -1) {
193 ctrlsock.si_name = optarg;
208 fprintf(stderr, "rtadvd: "
209 "the -R option is currently ignored.\n");
217 pidfilename = optarg;
226 logopt = LOG_NDELAY | LOG_PID;
228 logopt |= LOG_PERROR;
229 openlog("rtadvd", logopt, LOG_DAEMON);
233 (void)setlogmask(LOG_UPTO(LOG_DEBUG));
235 (void)setlogmask(LOG_UPTO(LOG_INFO));
237 (void)setlogmask(LOG_UPTO(LOG_NOTICE));
239 (void)setlogmask(LOG_UPTO(LOG_ERR));
241 /* timer initialization */
244 pfh = pidfile_open(pidfilename, 0600, &otherpid);
247 errx(1, "%s already running, pid: %d",
248 getprogname(), otherpid);
250 "failed to open the pid file %s, run anyway.",
258 update_ifinfo(&ifilist, UPDATE_IFINFO_ALL);
259 for (i = 0; i < argc; i++)
260 update_persist_ifinfo(&ifilist, argv[i]);
262 csock_open(&ctrlsock, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
263 if (ctrlsock.si_fd == -1) {
264 syslog(LOG_ERR, "cannot open control socket: %s",
269 /* record the current PID */
273 set[PFD_RAWSOCK].fd = sock.si_fd;
274 set[PFD_RAWSOCK].events = POLLIN;
276 rtsock_open(&rtsock);
277 set[PFD_RTSOCK].fd = rtsock.si_fd;
278 set[PFD_RTSOCK].events = POLLIN;
280 set[PFD_RTSOCK].fd = -1;
281 set[PFD_CSOCK].fd = ctrlsock.si_fd;
282 set[PFD_CSOCK].events = POLLIN;
283 signal(SIGTERM, set_do_shutdown);
284 signal(SIGINT, set_do_shutdown);
285 signal(SIGHUP, set_do_reload);
287 error = csock_listen(&ctrlsock);
289 syslog(LOG_ERR, "cannot listen control socket: %s",
294 /* load configuration file */
298 if (is_do_shutdown())
301 if (is_do_reload()) {
302 loadconfig_ifname(reload_ifname());
303 if (reload_ifname() == NULL)
305 "configuration file reloaded.");
308 "configuration file for %s reloaded.",
313 /* timeout handler update for active interfaces */
314 rtadvd_update_timeout_handler();
316 /* timer expiration check and reset the timer */
317 timeout = rtadvd_check_timer();
319 if (timeout != NULL) {
321 "<%s> set timer to %ld:%ld. waiting for "
322 "inputs or timeout", __func__,
323 (long int)timeout->tv_sec,
324 (long int)timeout->tv_nsec / 1000);
327 "<%s> there's no timer. waiting for inputs",
330 if ((i = poll(set, sizeof(set)/sizeof(set[0]),
331 timeout ? (timeout->tv_sec * 1000 +
332 timeout->tv_nsec / 1000 / 1000) : INFTIM)) < 0) {
334 /* EINTR would occur if a signal was delivered */
336 syslog(LOG_ERR, "poll() failed: %s",
340 if (i == 0) /* timeout */
342 if (rtsock.si_fd != -1 && set[PFD_RTSOCK].revents & POLLIN)
343 rtmsg_input(&rtsock);
345 if (set[PFD_RAWSOCK].revents & POLLIN)
348 if (set[PFD_CSOCK].revents & POLLIN) {
351 fd = csock_accept(&ctrlsock);
354 "cannot accept() control socket: %s",
357 cm_handler_server(fd);
362 exit(0); /* NOTREACHED */
366 rtadvd_shutdown(void)
375 "waiting expiration of the all RA timers.");
377 TAILQ_FOREACH(ifi, &ifilist, ifi_next) {
379 * Ignore !IFF_UP interfaces in waiting for shutdown.
381 if (!(ifi->ifi_flags & IFF_UP) &&
382 ifi->ifi_ra_timer != NULL) {
383 ifi->ifi_state = IFI_STATE_UNCONFIGURED;
384 rtadvd_remove_timer(ifi->ifi_ra_timer);
385 ifi->ifi_ra_timer = NULL;
386 syslog(LOG_DEBUG, "<%s> %s(idx=%d) is down. "
387 "Timer removed and marked as UNCONFIGURED.",
388 __func__, ifi->ifi_ifname,
392 TAILQ_FOREACH(ifi, &ifilist, ifi_next) {
393 if (ifi->ifi_ra_timer != NULL)
397 syslog(LOG_NOTICE, "gracefully terminated.");
405 syslog(LOG_DEBUG, "<%s> cease to be an advertising router",
410 TAILQ_FOREACH(rai, &railist, rai_next) {
411 rai->rai_lifetime = 0;
412 TAILQ_FOREACH(rdn, &rai->rai_rdnss, rd_next)
414 TAILQ_FOREACH(dns, &rai->rai_dnssl, dn_next)
417 TAILQ_FOREACH(ifi, &ifilist, ifi_next) {
418 if (!ifi->ifi_persist)
420 if (ifi->ifi_state == IFI_STATE_UNCONFIGURED)
422 if (ifi->ifi_ra_timer == NULL)
424 if (ifi->ifi_ra_lastsent.tv_sec == 0 &&
425 ifi->ifi_ra_lastsent.tv_nsec == 0 &&
426 ifi->ifi_ra_timer != NULL) {
428 * When RA configured but never sent,
429 * ignore the IF immediately.
431 rtadvd_remove_timer(ifi->ifi_ra_timer);
432 ifi->ifi_ra_timer = NULL;
433 ifi->ifi_state = IFI_STATE_UNCONFIGURED;
437 ifi->ifi_state = IFI_STATE_TRANSITIVE;
439 /* Mark as the shut-down state. */
440 ifi->ifi_rainfo_trans = ifi->ifi_rainfo;
441 ifi->ifi_rainfo = NULL;
443 ifi->ifi_burstcount = MAX_FINAL_RTR_ADVERTISEMENTS;
444 ifi->ifi_burstinterval = MIN_DELAY_BETWEEN_RAS;
446 ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm);
447 rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm,
450 syslog(LOG_NOTICE, "final RA transmission started.");
453 csock_close(&ctrlsock);
457 rtmsg_input(struct sockinfo *s)
459 int n, type, ifindex = 0, plen;
461 char msg[2048], *next, *lim;
462 char ifname[IFNAMSIZ];
463 struct if_announcemsghdr *ifan;
464 struct rt_msghdr *rtm;
467 struct in6_addr *addr;
469 char addrbuf[INET6_ADDRSTRLEN];
470 int prefixchange = 0;
473 syslog(LOG_ERR, "<%s> internal error", __func__);
476 n = read(s->si_fd, msg, sizeof(msg));
477 rtm = (struct rt_msghdr *)msg;
478 syslog(LOG_DEBUG, "<%s> received a routing message "
479 "(type = %d, len = %d)", __func__, rtm->rtm_type, n);
481 if (n > rtm->rtm_msglen) {
483 * This usually won't happen for messages received on
487 "<%s> received data length is larger than "
488 "1st routing message len. multiple messages? "
489 "read %d bytes, but 1st msg len = %d",
490 __func__, n, rtm->rtm_msglen);
498 for (next = msg; next < lim; next += len) {
501 next = get_next_msg(next, lim, 0, &len,
502 RTADV_TYPE2BITMASK(RTM_ADD) |
503 RTADV_TYPE2BITMASK(RTM_DELETE) |
504 RTADV_TYPE2BITMASK(RTM_NEWADDR) |
505 RTADV_TYPE2BITMASK(RTM_DELADDR) |
506 RTADV_TYPE2BITMASK(RTM_IFINFO) |
507 RTADV_TYPE2BITMASK(RTM_IFANNOUNCE));
510 type = ((struct rt_msghdr *)next)->rtm_type;
514 ifindex = get_rtm_ifindex(next);
518 ifindex = (int)((struct ifa_msghdr *)next)->ifam_index;
521 ifindex = (int)((struct if_msghdr *)next)->ifm_index;
524 ifan = (struct if_announcemsghdr *)next;
525 switch (ifan->ifan_what) {
531 "<%s:%d> unknown ifan msg (ifan_what=%d)",
532 __func__, __LINE__, ifan->ifan_what);
536 syslog(LOG_DEBUG, "<%s>: if_announcemsg (idx=%d:%d)",
537 __func__, ifan->ifan_index, ifan->ifan_what);
538 switch (ifan->ifan_what) {
541 "interface added (idx=%d)",
543 update_ifinfo(&ifilist, ifan->ifan_index);
544 loadconfig_index(ifan->ifan_index);
548 "interface removed (idx=%d)",
550 rm_ifinfo_index(ifan->ifan_index);
552 /* Clear ifi_ifindex */
553 TAILQ_FOREACH(ifi, &ifilist, ifi_next) {
555 == ifan->ifan_index) {
556 ifi->ifi_ifindex = 0;
560 update_ifinfo(&ifilist, ifan->ifan_index);
565 /* should not reach here */
567 "<%s:%d> unknown rtmsg %d on %s",
568 __func__, __LINE__, type,
569 if_indextoname(ifindex, ifname));
572 ifi = if_indextoifinfo(ifindex);
575 "<%s> ifinfo not found for idx=%d. Why?",
579 rai = ifi->ifi_rainfo;
582 "<%s> route changed on "
583 "non advertising interface(%s)",
584 __func__, ifi->ifi_ifname);
588 oldifflags = ifi->ifi_flags;
589 /* init ifflags because it may have changed */
590 update_ifinfo(&ifilist, ifindex);
595 break; /* we aren't interested in prefixes */
597 addr = get_addr(msg);
598 plen = get_prefixlen(msg);
599 /* sanity check for plen */
600 /* as RFC2373, prefixlen is at least 4 */
601 if (plen < 4 || plen > 127) {
602 syslog(LOG_INFO, "<%s> new interface route's"
603 "plen %d is invalid for a prefix",
607 pfx = find_prefix(rai, addr, plen);
609 if (pfx->pfx_timer) {
611 * If the prefix has been invalidated,
612 * make it available again.
618 "<%s> new prefix(%s/%d) "
620 "but it was already in list",
622 inet_ntop(AF_INET6, addr,
625 plen, ifi->ifi_ifname);
628 make_prefix(rai, ifindex, addr, plen);
635 addr = get_addr(msg);
636 plen = get_prefixlen(msg);
637 /* sanity check for plen */
638 /* as RFC2373, prefixlen is at least 4 */
639 if (plen < 4 || plen > 127) {
641 "<%s> deleted interface route's "
642 "plen %d is invalid for a prefix",
646 pfx = find_prefix(rai, addr, plen);
649 "<%s> prefix(%s/%d) was deleted on %s, "
650 "but it was not in list",
651 __func__, inet_ntop(AF_INET6, addr,
652 (char *)addrbuf, sizeof(addrbuf)),
653 plen, ifi->ifi_ifname);
656 invalidate_prefix(pfx);
664 /* should not reach here */
666 "<%s:%d> unknown rtmsg %d on %s",
667 __func__, __LINE__, type,
668 if_indextoname(ifindex, ifname));
672 /* check if an interface flag is changed */
673 if ((oldifflags & IFF_UP) && /* UP to DOWN */
674 !(ifi->ifi_flags & IFF_UP)) {
676 "<interface %s becomes down. stop timer.",
678 rtadvd_remove_timer(ifi->ifi_ra_timer);
679 ifi->ifi_ra_timer = NULL;
680 } else if (!(oldifflags & IFF_UP) && /* DOWN to UP */
681 (ifi->ifi_flags & IFF_UP)) {
683 "interface %s becomes up. restart timer.",
686 ifi->ifi_state = IFI_STATE_TRANSITIVE;
687 ifi->ifi_burstcount =
688 MAX_INITIAL_RTR_ADVERTISEMENTS;
689 ifi->ifi_burstinterval =
690 MAX_INITIAL_RTR_ADVERT_INTERVAL;
692 ifi->ifi_ra_timer = rtadvd_add_timer(ra_timeout,
693 ra_timer_update, ifi, ifi);
694 ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm);
695 rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm,
697 } else if (prefixchange &&
698 (ifi->ifi_flags & IFF_UP)) {
700 * An advertised prefix has been added or invalidated.
701 * Will notice the change in a short delay.
703 set_short_delay(ifi);
711 rtadvd_input(struct sockinfo *s)
718 struct icmp6_hdr *icp;
721 struct in6_pktinfo *pi = NULL;
722 char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
723 struct in6_addr dst = in6addr_any;
726 syslog(LOG_DEBUG, "<%s> enter", __func__);
729 syslog(LOG_ERR, "<%s> internal error", __func__);
733 * Get message. We reset msg_controllen since the field could
734 * be modified if we had received a message before setting
737 rcvmhdr.msg_controllen = rcvcmsgbuflen;
738 if ((i = recvmsg(s->si_fd, &rcvmhdr, 0)) < 0)
741 /* extract optional information via Advanced API */
742 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&rcvmhdr);
744 cm = (struct cmsghdr *)CMSG_NXTHDR(&rcvmhdr, cm)) {
745 if (cm->cmsg_level == IPPROTO_IPV6 &&
746 cm->cmsg_type == IPV6_PKTINFO &&
747 cm->cmsg_len == CMSG_LEN(sizeof(struct in6_pktinfo))) {
748 pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
749 ifindex = pi->ipi6_ifindex;
752 if (cm->cmsg_level == IPPROTO_IPV6 &&
753 cm->cmsg_type == IPV6_HOPLIMIT &&
754 cm->cmsg_len == CMSG_LEN(sizeof(int)))
755 hlimp = (int *)CMSG_DATA(cm);
758 syslog(LOG_ERR, "failed to get receiving interface");
762 syslog(LOG_ERR, "failed to get receiving hop limit");
767 * If we happen to receive data on an interface which is now gone
768 * or down, just discard the data.
770 ifi = if_indextoifinfo(pi->ipi6_ifindex);
771 if (ifi == NULL || !(ifi->ifi_flags & IFF_UP)) {
773 "<%s> received data on a disabled interface (%s)",
775 (ifi == NULL) ? "[gone]" : ifi->ifi_ifname);
780 if ((size_t)i < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr)) {
782 "packet size(%d) is too short", i);
786 ip = (struct ip6_hdr *)rcvmhdr.msg_iov[0].iov_base;
787 icp = (struct icmp6_hdr *)(ip + 1); /* XXX: ext. hdr? */
789 if ((size_t)i < sizeof(struct icmp6_hdr)) {
790 syslog(LOG_ERR, "packet size(%zd) is too short", i);
794 icp = (struct icmp6_hdr *)rcvmhdr.msg_iov[0].iov_base;
797 switch (icp->icmp6_type) {
798 case ND_ROUTER_SOLICIT:
800 * Message verification - RFC 4861 6.1.1
801 * XXX: these checks must be done in the kernel as well,
802 * but we can't completely rely on them.
806 "RS with invalid hop limit(%d) "
807 "received from %s on %s",
809 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
811 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
814 if (icp->icmp6_code) {
816 "RS with invalid ICMP6 code(%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 ((size_t)i < sizeof(struct nd_router_solicit)) {
826 "RS from %s on %s does not have enough "
827 "length (len = %zd)",
828 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
830 if_indextoname(pi->ipi6_ifindex, ifnamebuf), i);
833 rs_input(i, (struct nd_router_solicit *)icp, pi, &rcvfrom);
835 case ND_ROUTER_ADVERT:
837 * Message verification - RFC 4861 6.1.2
838 * XXX: there's the same dilemma as above...
840 if (!IN6_IS_ADDR_LINKLOCAL(&rcvfrom.sin6_addr)) {
842 "RA with non-linklocal source address "
843 "received from %s on %s",
844 inet_ntop(AF_INET6, &rcvfrom.sin6_addr,
845 ntopbuf, sizeof(ntopbuf)),
846 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
851 "RA with invalid hop limit(%d) "
852 "received from %s on %s",
854 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
856 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
859 if (icp->icmp6_code) {
861 "RA with invalid ICMP6 code(%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 ((size_t)i < sizeof(struct nd_router_advert)) {
871 "RA from %s on %s does not have enough "
872 "length (len = %zd)",
873 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
875 if_indextoname(pi->ipi6_ifindex, ifnamebuf), i);
878 ra_input(i, (struct nd_router_advert *)icp, pi, &rcvfrom);
880 case ICMP6_ROUTER_RENUMBERING:
881 if (mcastif == NULL) {
882 syslog(LOG_ERR, "received a router renumbering "
883 "message, but not allowed to be accepted");
886 rr_input(i, (struct icmp6_router_renum *)icp, pi, &rcvfrom,
891 * Note that this case is POSSIBLE, especially just
892 * after invocation of the daemon. This is because we
893 * could receive message after opening the socket and
894 * before setting ICMP6 type filter(see sock_open()).
896 syslog(LOG_ERR, "invalid icmp type(%d)", icp->icmp6_type);
904 rs_input(int len, struct nd_router_solicit *rs,
905 struct in6_pktinfo *pi, struct sockaddr_in6 *from)
907 char ntopbuf[INET6_ADDRSTRLEN];
908 char ifnamebuf[IFNAMSIZ];
912 struct soliciter *sol;
915 "<%s> RS received from %s on %s",
917 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)),
918 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
920 /* ND option check */
921 memset(&ndopts, 0, sizeof(ndopts));
922 TAILQ_INIT(&ndopts.opt_list);
923 if (nd6_options((struct nd_opt_hdr *)(rs + 1),
924 len - sizeof(struct nd_router_solicit),
925 &ndopts, NDOPT_FLAG_SRCLINKADDR)) {
927 "<%s> ND option check failed for an RS from %s on %s",
929 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
931 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
936 * If the IP source address is the unspecified address, there
937 * must be no source link-layer address option in the message.
940 if (IN6_IS_ADDR_UNSPECIFIED(&from->sin6_addr) &&
941 ndopts.opt_src_lladdr) {
943 "<%s> RS from unspecified src on %s has a link-layer"
945 __func__, if_indextoname(pi->ipi6_ifindex, ifnamebuf));
949 ifi = if_indextoifinfo(pi->ipi6_ifindex);
952 "<%s> if (idx=%d) not found. Why?",
953 __func__, pi->ipi6_ifindex);
956 rai = ifi->ifi_rainfo;
959 "<%s> RS received on non advertising interface(%s)",
961 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
965 rai->rai_ifinfo->ifi_rsinput++;
968 * Decide whether to send RA according to the rate-limit
972 /* record sockaddr waiting for RA, if possible */
973 sol = (struct soliciter *)malloc(sizeof(*sol));
975 sol->sol_addr = *from;
976 /* XXX RFC 2553 need clarification on flowinfo */
977 sol->sol_addr.sin6_flowinfo = 0;
978 TAILQ_INSERT_TAIL(&rai->rai_soliciter, sol, sol_next);
982 * If there is already a waiting RS packet, don't
985 if (ifi->ifi_rs_waitcount++)
988 set_short_delay(ifi);
991 free_ndopts(&ndopts);
996 set_short_delay(struct ifinfo *ifi)
998 long delay; /* must not be greater than 1000000 */
999 struct timespec interval, now, min_delay, tm_tmp, *rest;
1001 if (ifi->ifi_ra_timer == NULL)
1004 * Compute a random delay. If the computed value
1005 * corresponds to a time later than the time the next
1006 * multicast RA is scheduled to be sent, ignore the random
1007 * delay and send the advertisement at the
1008 * already-scheduled time. RFC 4861 6.2.6
1010 delay = arc4random_uniform(MAX_RA_DELAY_TIME);
1011 interval.tv_sec = 0;
1012 interval.tv_nsec = delay * 1000;
1013 rest = rtadvd_timer_rest(ifi->ifi_ra_timer);
1014 if (TS_CMP(rest, &interval, <)) {
1015 syslog(LOG_DEBUG, "<%s> random delay is larger than "
1016 "the rest of the current timer", __func__);
1021 * If we sent a multicast Router Advertisement within
1022 * the last MIN_DELAY_BETWEEN_RAS seconds, schedule
1023 * the advertisement to be sent at a time corresponding to
1024 * MIN_DELAY_BETWEEN_RAS plus the random value after the
1025 * previous advertisement was sent.
1027 clock_gettime(CLOCK_MONOTONIC_FAST, &now);
1028 TS_SUB(&now, &ifi->ifi_ra_lastsent, &tm_tmp);
1029 min_delay.tv_sec = MIN_DELAY_BETWEEN_RAS;
1030 min_delay.tv_nsec = 0;
1031 if (TS_CMP(&tm_tmp, &min_delay, <)) {
1032 TS_SUB(&min_delay, &tm_tmp, &min_delay);
1033 TS_ADD(&min_delay, &interval, &interval);
1035 rtadvd_set_timer(&interval, ifi->ifi_ra_timer);
1039 check_accept_rtadv(int idx)
1043 TAILQ_FOREACH(ifi, &ifilist, ifi_next) {
1044 if (ifi->ifi_ifindex == idx)
1049 "<%s> if (idx=%d) not found. Why?",
1053 #if (__FreeBSD_version < 900000)
1055 * RA_RECV: !ip6.forwarding && ip6.accept_rtadv
1056 * RA_SEND: ip6.forwarding
1058 return ((getinet6sysctl(IPV6CTL_FORWARDING) == 0) &&
1059 (getinet6sysctl(IPV6CTL_ACCEPT_RTADV) == 1));
1062 * RA_RECV: ND6_IFF_ACCEPT_RTADV
1063 * RA_SEND: ip6.forwarding
1065 if (update_ifinfo_nd_flags(ifi) != 0) {
1066 syslog(LOG_ERR, "cannot get nd6 flags (idx=%d)", idx);
1070 return (ifi->ifi_nd_flags & ND6_IFF_ACCEPT_RTADV);
1075 ra_input(int len, struct nd_router_advert *nra,
1076 struct in6_pktinfo *pi, struct sockaddr_in6 *from)
1080 char ntopbuf[INET6_ADDRSTRLEN];
1081 char ifnamebuf[IFNAMSIZ];
1082 union nd_opt ndopts;
1083 const char *on_off[] = {"OFF", "ON"};
1084 uint32_t reachabletime, retranstimer, mtu;
1085 int inconsistent = 0;
1088 syslog(LOG_DEBUG, "<%s> RA received from %s on %s", __func__,
1089 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)),
1090 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
1092 /* ND option check */
1093 memset(&ndopts, 0, sizeof(ndopts));
1094 TAILQ_INIT(&ndopts.opt_list);
1095 error = nd6_options((struct nd_opt_hdr *)(nra + 1),
1096 len - sizeof(struct nd_router_advert), &ndopts,
1097 NDOPT_FLAG_SRCLINKADDR | NDOPT_FLAG_PREFIXINFO | NDOPT_FLAG_MTU |
1098 NDOPT_FLAG_RDNSS | NDOPT_FLAG_DNSSL);
1101 "<%s> ND option check failed for an RA from %s on %s",
1103 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1104 sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex,
1110 * RA consistency check according to RFC 4861 6.2.7
1112 ifi = if_indextoifinfo(pi->ipi6_ifindex);
1113 if (ifi->ifi_rainfo == NULL) {
1115 "<%s> received RA from %s on non-advertising"
1118 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1119 sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex,
1123 rai = ifi->ifi_rainfo;
1125 syslog(LOG_DEBUG, "<%s> ifi->ifi_rainput = %" PRIu64, __func__,
1128 /* Cur Hop Limit value */
1129 if (nra->nd_ra_curhoplimit && rai->rai_hoplimit &&
1130 nra->nd_ra_curhoplimit != rai->rai_hoplimit) {
1132 "CurHopLimit inconsistent on %s:"
1133 " %d from %s, %d from us",
1134 ifi->ifi_ifname, nra->nd_ra_curhoplimit,
1135 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1136 sizeof(ntopbuf)), rai->rai_hoplimit);
1140 if ((nra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED) !=
1141 rai->rai_managedflg) {
1143 "M flag inconsistent on %s:"
1144 " %s from %s, %s from us",
1145 ifi->ifi_ifname, on_off[!rai->rai_managedflg],
1146 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1147 sizeof(ntopbuf)), on_off[rai->rai_managedflg]);
1151 if ((nra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER) !=
1152 rai->rai_otherflg) {
1154 "O flag inconsistent on %s:"
1155 " %s from %s, %s from us",
1156 ifi->ifi_ifname, on_off[!rai->rai_otherflg],
1157 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1158 sizeof(ntopbuf)), on_off[rai->rai_otherflg]);
1161 /* Reachable Time */
1162 reachabletime = ntohl(nra->nd_ra_reachable);
1163 if (reachabletime && rai->rai_reachabletime &&
1164 reachabletime != rai->rai_reachabletime) {
1166 "ReachableTime inconsistent on %s:"
1167 " %d from %s, %d from us",
1168 ifi->ifi_ifname, reachabletime,
1169 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1170 sizeof(ntopbuf)), rai->rai_reachabletime);
1174 retranstimer = ntohl(nra->nd_ra_retransmit);
1175 if (retranstimer && rai->rai_retranstimer &&
1176 retranstimer != rai->rai_retranstimer) {
1178 "RetranceTimer inconsistent on %s:"
1179 " %d from %s, %d from us",
1180 ifi->ifi_ifname, retranstimer,
1181 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1182 sizeof(ntopbuf)), rai->rai_retranstimer);
1185 /* Values in the MTU options */
1186 if (ndopts.opt_mtu) {
1187 mtu = ntohl(ndopts.opt_mtu->nd_opt_mtu_mtu);
1188 if (mtu && rai->rai_linkmtu && mtu != rai->rai_linkmtu) {
1190 "MTU option value inconsistent on %s:"
1191 " %d from %s, %d from us",
1192 ifi->ifi_ifname, mtu,
1193 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1194 sizeof(ntopbuf)), rai->rai_linkmtu);
1198 /* Preferred and Valid Lifetimes for prefixes */
1200 struct nd_optlist *nol;
1203 if (prefix_check(ndopts.opt_pi, rai, from))
1206 TAILQ_FOREACH(nol, &ndopts.opt_list, nol_next)
1207 if (prefix_check((struct nd_opt_prefix_info *)nol->nol_opt,
1213 ifi->ifi_rainconsistent++;
1216 free_ndopts(&ndopts);
1221 udiff(uint32_t u, uint32_t v)
1223 return (u >= v ? u - v : v - u);
1226 /* return a non-zero value if the received prefix is inconsistent with ours */
1228 prefix_check(struct nd_opt_prefix_info *pinfo,
1229 struct rainfo *rai, struct sockaddr_in6 *from)
1232 uint32_t preferred_time, valid_time;
1234 int inconsistent = 0;
1235 char ntopbuf[INET6_ADDRSTRLEN];
1236 char prefixbuf[INET6_ADDRSTRLEN];
1237 struct timespec now;
1239 #if 0 /* impossible */
1240 if (pinfo->nd_opt_pi_type != ND_OPT_PREFIX_INFORMATION)
1243 ifi = rai->rai_ifinfo;
1245 * log if the adveritsed prefix has link-local scope(sanity check?)
1247 if (IN6_IS_ADDR_LINKLOCAL(&pinfo->nd_opt_pi_prefix))
1249 "<%s> link-local prefix %s/%d is advertised "
1252 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf,
1254 pinfo->nd_opt_pi_prefix_len,
1255 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1256 sizeof(ntopbuf)), ifi->ifi_ifname);
1258 if ((pfx = find_prefix(rai, &pinfo->nd_opt_pi_prefix,
1259 pinfo->nd_opt_pi_prefix_len)) == NULL) {
1261 "<%s> prefix %s/%d from %s on %s is not in our list",
1263 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf,
1265 pinfo->nd_opt_pi_prefix_len,
1266 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1267 sizeof(ntopbuf)), ifi->ifi_ifname);
1271 preferred_time = ntohl(pinfo->nd_opt_pi_preferred_time);
1272 if (pfx->pfx_pltimeexpire) {
1274 * The lifetime is decremented in real time, so we should
1275 * compare the expiration time.
1276 * (RFC 2461 Section 6.2.7.)
1277 * XXX: can we really expect that all routers on the link
1278 * have synchronized clocks?
1280 clock_gettime(CLOCK_MONOTONIC_FAST, &now);
1281 preferred_time += now.tv_sec;
1283 if (!pfx->pfx_timer && rai->rai_clockskew &&
1284 udiff(preferred_time, pfx->pfx_pltimeexpire) > rai->rai_clockskew) {
1286 "<%s> preferred lifetime for %s/%d"
1287 " (decr. in real time) inconsistent on %s:"
1288 " %" PRIu32 " from %s, %" PRIu32 " from us",
1290 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf,
1292 pinfo->nd_opt_pi_prefix_len,
1293 ifi->ifi_ifname, preferred_time,
1294 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1295 sizeof(ntopbuf)), pfx->pfx_pltimeexpire);
1298 } else if (!pfx->pfx_timer && preferred_time != pfx->pfx_preflifetime)
1300 "<%s> preferred lifetime for %s/%d"
1301 " inconsistent on %s:"
1302 " %d from %s, %d 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_preflifetime);
1311 valid_time = ntohl(pinfo->nd_opt_pi_valid_time);
1312 if (pfx->pfx_vltimeexpire) {
1313 clock_gettime(CLOCK_MONOTONIC_FAST, &now);
1314 valid_time += now.tv_sec;
1316 if (!pfx->pfx_timer && rai->rai_clockskew &&
1317 udiff(valid_time, pfx->pfx_vltimeexpire) > rai->rai_clockskew) {
1319 "<%s> valid lifetime for %s/%d"
1320 " (decr. in real time) inconsistent on %s:"
1321 " %d from %s, %" PRIu32 " from us",
1323 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf,
1325 pinfo->nd_opt_pi_prefix_len,
1326 ifi->ifi_ifname, preferred_time,
1327 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1328 sizeof(ntopbuf)), pfx->pfx_vltimeexpire);
1331 } else if (!pfx->pfx_timer && valid_time != pfx->pfx_validlifetime) {
1333 "<%s> valid lifetime for %s/%d"
1334 " inconsistent on %s:"
1335 " %d from %s, %d from us",
1337 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf,
1339 pinfo->nd_opt_pi_prefix_len,
1340 ifi->ifi_ifname, valid_time,
1341 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf,
1342 sizeof(ntopbuf)), pfx->pfx_validlifetime);
1346 return (inconsistent);
1350 find_prefix(struct rainfo *rai, struct in6_addr *prefix, int plen)
1353 int bytelen, bitlen;
1356 TAILQ_FOREACH(pfx, &rai->rai_prefix, pfx_next) {
1357 if (plen != pfx->pfx_prefixlen)
1362 bitmask = 0xff << (8 - bitlen);
1364 if (memcmp((void *)prefix, (void *)&pfx->pfx_prefix, bytelen))
1368 ((prefix->s6_addr[bytelen] & bitmask) ==
1369 (pfx->pfx_prefix.s6_addr[bytelen] & bitmask))) {
1377 /* check if p0/plen0 matches p1/plen1; return 1 if matches, otherwise 0. */
1379 prefix_match(struct in6_addr *p0, int plen0,
1380 struct in6_addr *p1, int plen1)
1382 int bytelen, bitlen;
1388 bytelen = plen1 / 8;
1390 bitmask = 0xff << (8 - bitlen);
1392 if (memcmp((void *)p0, (void *)p1, bytelen))
1396 ((p0->s6_addr[bytelen] & bitmask) ==
1397 (p1->s6_addr[bytelen] & bitmask))) {
1405 nd6_options(struct nd_opt_hdr *hdr, int limit,
1406 union nd_opt *ndopts, uint32_t optflags)
1410 for (; limit > 0; limit -= optlen) {
1411 if ((size_t)limit < sizeof(struct nd_opt_hdr)) {
1412 syslog(LOG_INFO, "<%s> short option header", __func__);
1416 hdr = (struct nd_opt_hdr *)((caddr_t)hdr + optlen);
1417 if (hdr->nd_opt_len == 0) {
1419 "<%s> bad ND option length(0) (type = %d)",
1420 __func__, hdr->nd_opt_type);
1423 optlen = hdr->nd_opt_len << 3;
1424 if (optlen > limit) {
1425 syslog(LOG_INFO, "<%s> short option", __func__);
1429 if (hdr->nd_opt_type > ND_OPT_MTU &&
1430 hdr->nd_opt_type != ND_OPT_RDNSS &&
1431 hdr->nd_opt_type != ND_OPT_DNSSL) {
1432 syslog(LOG_INFO, "<%s> unknown ND option(type %d)",
1433 __func__, hdr->nd_opt_type);
1437 if ((ndopt_flags[hdr->nd_opt_type] & optflags) == 0) {
1438 syslog(LOG_INFO, "<%s> unexpected ND option(type %d)",
1439 __func__, hdr->nd_opt_type);
1444 * Option length check. Do it here for all fixed-length
1447 switch (hdr->nd_opt_type) {
1449 if (optlen == sizeof(struct nd_opt_mtu))
1454 (optlen - sizeof(struct nd_opt_rdnss)) % 16 == 0)
1459 (optlen - sizeof(struct nd_opt_dnssl)) % 8 == 0)
1462 case ND_OPT_PREFIX_INFORMATION:
1463 if (optlen == sizeof(struct nd_opt_prefix_info))
1466 syslog(LOG_INFO, "<%s> invalid option length",
1471 switch (hdr->nd_opt_type) {
1472 case ND_OPT_TARGET_LINKADDR:
1473 case ND_OPT_REDIRECTED_HEADER:
1476 break; /* we don't care about these options */
1477 case ND_OPT_SOURCE_LINKADDR:
1479 if (ndopts->opt_array[hdr->nd_opt_type]) {
1481 "<%s> duplicated ND option (type = %d)",
1482 __func__, hdr->nd_opt_type);
1484 ndopts->opt_array[hdr->nd_opt_type] = hdr;
1486 case ND_OPT_PREFIX_INFORMATION:
1488 struct nd_optlist *nol;
1490 if (ndopts->opt_pi == 0) {
1492 (struct nd_opt_prefix_info *)hdr;
1495 nol = malloc(sizeof(*nol));
1497 syslog(LOG_ERR, "<%s> can't allocate memory",
1502 TAILQ_INSERT_TAIL(&(ndopts->opt_list), nol, nol_next);
1506 default: /* impossible */
1514 free_ndopts(ndopts);
1520 free_ndopts(union nd_opt *ndopts)
1522 struct nd_optlist *nol;
1524 while ((nol = TAILQ_FIRST(&ndopts->opt_list)) != NULL) {
1525 TAILQ_REMOVE(&ndopts->opt_list, nol, nol_next);
1531 sock_open(struct sockinfo *s)
1533 struct icmp6_filter filt;
1535 /* XXX: should be max MTU attached to the node */
1536 static char answer[1500];
1538 syslog(LOG_DEBUG, "<%s> enter", __func__);
1541 syslog(LOG_ERR, "<%s> internal error", __func__);
1544 rcvcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
1545 CMSG_SPACE(sizeof(int));
1546 rcvcmsgbuf = (char *)malloc(rcvcmsgbuflen);
1547 if (rcvcmsgbuf == NULL) {
1548 syslog(LOG_ERR, "<%s> not enough core", __func__);
1552 sndcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
1553 CMSG_SPACE(sizeof(int));
1554 sndcmsgbuf = (char *)malloc(sndcmsgbuflen);
1555 if (sndcmsgbuf == NULL) {
1556 syslog(LOG_ERR, "<%s> not enough core", __func__);
1560 if ((s->si_fd = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
1561 syslog(LOG_ERR, "<%s> socket: %s", __func__, strerror(errno));
1564 /* specify to tell receiving interface */
1566 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
1568 syslog(LOG_ERR, "<%s> IPV6_RECVPKTINFO: %s", __func__,
1573 /* specify to tell value of hoplimit field of received IP6 hdr */
1574 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
1576 syslog(LOG_ERR, "<%s> IPV6_RECVHOPLIMIT: %s", __func__,
1580 ICMP6_FILTER_SETBLOCKALL(&filt);
1581 ICMP6_FILTER_SETPASS(ND_ROUTER_SOLICIT, &filt);
1582 ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filt);
1583 if (mcastif != NULL)
1584 ICMP6_FILTER_SETPASS(ICMP6_ROUTER_RENUMBERING, &filt);
1586 if (setsockopt(s->si_fd, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
1587 sizeof(filt)) < 0) {
1588 syslog(LOG_ERR, "<%s> IICMP6_FILTER: %s",
1589 __func__, strerror(errno));
1593 /* initialize msghdr for receiving packets */
1594 rcviov[0].iov_base = (caddr_t)answer;
1595 rcviov[0].iov_len = sizeof(answer);
1596 rcvmhdr.msg_name = (caddr_t)&rcvfrom;
1597 rcvmhdr.msg_namelen = sizeof(rcvfrom);
1598 rcvmhdr.msg_iov = rcviov;
1599 rcvmhdr.msg_iovlen = 1;
1600 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
1601 rcvmhdr.msg_controllen = rcvcmsgbuflen;
1603 /* initialize msghdr for sending packets */
1604 sndmhdr.msg_namelen = sizeof(struct sockaddr_in6);
1605 sndmhdr.msg_iov = sndiov;
1606 sndmhdr.msg_iovlen = 1;
1607 sndmhdr.msg_control = (caddr_t)sndcmsgbuf;
1608 sndmhdr.msg_controllen = sndcmsgbuflen;
1613 /* open a routing socket to watch the routing table */
1615 rtsock_open(struct sockinfo *s)
1618 syslog(LOG_ERR, "<%s> internal error", __func__);
1621 if ((s->si_fd = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
1623 "<%s> socket: %s", __func__, strerror(errno));
1629 if_indextoifinfo(int idx)
1632 char *name, name0[IFNAMSIZ];
1634 /* Check if the interface has a valid name or not. */
1635 if (if_indextoname(idx, name0) == NULL)
1638 TAILQ_FOREACH(ifi, &ifilist, ifi_next) {
1639 if (ifi->ifi_ifindex == idx)
1644 syslog(LOG_DEBUG, "<%s> ifi found (idx=%d)",
1647 syslog(LOG_DEBUG, "<%s> ifi not found (idx=%d)",
1650 return (NULL); /* search failed */
1654 ra_output(struct ifinfo *ifi)
1658 struct in6_pktinfo *pi;
1659 struct soliciter *sol;
1662 switch (ifi->ifi_state) {
1663 case IFI_STATE_CONFIGURED:
1664 rai = ifi->ifi_rainfo;
1666 case IFI_STATE_TRANSITIVE:
1667 rai = ifi->ifi_rainfo_trans;
1669 case IFI_STATE_UNCONFIGURED:
1670 syslog(LOG_DEBUG, "<%s> %s is unconfigured. "
1671 "Skip sending RAs.",
1672 __func__, ifi->ifi_ifname);
1678 syslog(LOG_DEBUG, "<%s> rainfo is NULL on %s."
1679 "Skip sending RAs.",
1680 __func__, ifi->ifi_ifname);
1683 if (!(ifi->ifi_flags & IFF_UP)) {
1684 syslog(LOG_DEBUG, "<%s> %s is not up. "
1685 "Skip sending RAs.",
1686 __func__, ifi->ifi_ifname);
1690 * Check lifetime, ACCEPT_RTADV flag, and ip6.forwarding.
1692 * (lifetime == 0) = output
1693 * (lifetime != 0 && (check_accept_rtadv()) = no output
1695 * Basically, hosts MUST NOT send Router Advertisement
1696 * messages at any time (RFC 4861, Section 6.2.3). However, it
1697 * would sometimes be useful to allow hosts to advertise some
1698 * parameters such as prefix information and link MTU. Thus,
1699 * we allow hosts to invoke rtadvd only when router lifetime
1700 * (on every advertising interface) is explicitly set
1701 * zero. (see also the above section)
1704 "<%s> check lifetime=%d, ACCEPT_RTADV=%d, ip6.forwarding=%d "
1707 check_accept_rtadv(ifi->ifi_ifindex),
1708 getinet6sysctl(IPV6CTL_FORWARDING),
1711 if (rai->rai_lifetime != 0) {
1712 if (getinet6sysctl(IPV6CTL_FORWARDING) == 0) {
1714 "non-zero lifetime RA "
1715 "but net.inet6.ip6.forwarding=0. "
1719 if (check_accept_rtadv(ifi->ifi_ifindex)) {
1721 "non-zero lifetime RA "
1722 "on RA receiving interface %s."
1723 " Ignored.", ifi->ifi_ifname);
1728 make_packet(rai); /* XXX: inefficient */
1730 sndmhdr.msg_name = (caddr_t)&sin6_linklocal_allnodes;
1731 sndmhdr.msg_iov[0].iov_base = (caddr_t)rai->rai_ra_data;
1732 sndmhdr.msg_iov[0].iov_len = rai->rai_ra_datalen;
1734 cm = CMSG_FIRSTHDR(&sndmhdr);
1735 /* specify the outgoing interface */
1736 cm->cmsg_level = IPPROTO_IPV6;
1737 cm->cmsg_type = IPV6_PKTINFO;
1738 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
1739 pi = (struct in6_pktinfo *)CMSG_DATA(cm);
1740 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*XXX*/
1741 pi->ipi6_ifindex = ifi->ifi_ifindex;
1743 /* specify the hop limit of the packet */
1747 cm = CMSG_NXTHDR(&sndmhdr, cm);
1748 cm->cmsg_level = IPPROTO_IPV6;
1749 cm->cmsg_type = IPV6_HOPLIMIT;
1750 cm->cmsg_len = CMSG_LEN(sizeof(int));
1751 memcpy(CMSG_DATA(cm), &hoplimit, sizeof(int));
1755 "<%s> send RA on %s, # of RS waitings = %d",
1756 __func__, ifi->ifi_ifname, ifi->ifi_rs_waitcount);
1758 i = sendmsg(sock.si_fd, &sndmhdr, 0);
1760 if (i < 0 || (size_t)i != rai->rai_ra_datalen) {
1762 syslog(LOG_ERR, "<%s> sendmsg on %s: %s",
1763 __func__, ifi->ifi_ifname,
1769 * unicast advertisements
1770 * XXX commented out. reason: though spec does not forbit it, unicast
1771 * advert does not really help
1773 while ((sol = TAILQ_FIRST(&rai->rai_soliciter)) != NULL) {
1774 TAILQ_REMOVE(&rai->rai_soliciter, sol, sol_next);
1778 /* update timestamp */
1779 clock_gettime(CLOCK_MONOTONIC_FAST, &ifi->ifi_ra_lastsent);
1781 /* update counter */
1782 ifi->ifi_rs_waitcount = 0;
1783 ifi->ifi_raoutput++;
1785 switch (ifi->ifi_state) {
1786 case IFI_STATE_CONFIGURED:
1787 if (ifi->ifi_burstcount > 0)
1788 ifi->ifi_burstcount--;
1790 case IFI_STATE_TRANSITIVE:
1791 ifi->ifi_burstcount--;
1792 if (ifi->ifi_burstcount == 0) {
1793 if (ifi->ifi_rainfo == ifi->ifi_rainfo_trans) {
1794 /* Initial burst finished. */
1795 if (ifi->ifi_rainfo_trans != NULL)
1796 ifi->ifi_rainfo_trans = NULL;
1799 /* Remove burst RA information */
1800 if (ifi->ifi_rainfo_trans != NULL) {
1801 rm_rainfo(ifi->ifi_rainfo_trans);
1802 ifi->ifi_rainfo_trans = NULL;
1805 if (ifi->ifi_rainfo != NULL) {
1807 * TRANSITIVE -> CONFIGURED
1809 * After initial burst or transition from
1810 * one configuration to another,
1811 * ifi_rainfo always points to the next RA
1814 ifi->ifi_state = IFI_STATE_CONFIGURED;
1816 "<%s> ifname=%s marked as "
1817 "CONFIGURED.", __func__,
1821 * TRANSITIVE -> UNCONFIGURED
1823 * If ifi_rainfo points to NULL, this
1824 * interface is shutting down.
1829 ifi->ifi_state = IFI_STATE_UNCONFIGURED;
1831 "<%s> ifname=%s marked as "
1832 "UNCONFIGURED.", __func__,
1834 error = sock_mc_leave(&sock,
1844 /* process RA timer */
1845 struct rtadvd_timer *
1846 ra_timeout(void *arg)
1850 ifi = (struct ifinfo *)arg;
1851 syslog(LOG_DEBUG, "<%s> RA timer on %s is expired",
1852 __func__, ifi->ifi_ifname);
1856 return (ifi->ifi_ra_timer);
1859 /* update RA timer */
1861 ra_timer_update(void *arg, struct timespec *tm)
1867 ifi = (struct ifinfo *)arg;
1868 rai = ifi->ifi_rainfo;
1871 switch (ifi->ifi_state) {
1872 case IFI_STATE_UNCONFIGURED:
1875 case IFI_STATE_CONFIGURED:
1877 * Whenever a multicast advertisement is sent from
1878 * an interface, the timer is reset to a
1879 * uniformly-distributed random value between the
1880 * interface's configured MinRtrAdvInterval and
1881 * MaxRtrAdvInterval (RFC4861 6.2.4).
1883 interval = rai->rai_mininterval;
1884 interval += arc4random_uniform(rai->rai_maxinterval -
1885 rai->rai_mininterval);
1887 case IFI_STATE_TRANSITIVE:
1889 * For the first few advertisements (up to
1890 * MAX_INITIAL_RTR_ADVERTISEMENTS), if the randomly chosen
1891 * interval is greater than
1892 * MAX_INITIAL_RTR_ADVERT_INTERVAL, the timer SHOULD be
1893 * set to MAX_INITIAL_RTR_ADVERT_INTERVAL instead. (RFC
1896 * In such cases, the router SHOULD transmit one or more
1897 * (but not more than MAX_FINAL_RTR_ADVERTISEMENTS) final
1898 * multicast Router Advertisements on the interface with a
1899 * Router Lifetime field of zero. (RFC 4861 6.2.5)
1901 interval = ifi->ifi_burstinterval;
1905 tm->tv_sec = interval;
1909 "<%s> RA timer on %s is set to %ld:%ld",
1910 __func__, ifi->ifi_ifname,
1911 (long int)tm->tv_sec, (long int)tm->tv_nsec / 1000);