1 /* $KAME: rtsold.c,v 1.67 2003/05/17 18:16:15 itojun Exp $ */
4 * SPDX-License-Identifier: BSD-3-Clause
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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
36 #include <sys/types.h>
37 #include <sys/ioctl.h>
38 #include <sys/socket.h>
39 #include <sys/param.h>
42 #include <net/if_dl.h>
44 #include <netinet/in.h>
45 #include <netinet/icmp6.h>
46 #include <netinet/in_var.h>
47 #include <arpa/inet.h>
49 #include <netinet6/nd6.h>
66 #define RTSOL_DUMPFILE "/var/run/rtsold.dump";
67 #define RTSOL_PIDFILE "/var/run/rtsold.pid";
69 struct timespec tm_max;
70 static int log_upto = 999;
73 int Fflag = 0; /* force setting sysctl parameters */
78 const char *otherconf_script;
79 const char *resolvconf_script = "/sbin/resolvconf";
81 /* protocol constants */
82 #define MAX_RTR_SOLICITATION_DELAY 1 /* second */
83 #define RTR_SOLICITATION_INTERVAL 4 /* seconds */
84 #define MAX_RTR_SOLICITATIONS 3 /* times */
87 * implementation dependent constants in seconds
88 * XXX: should be configurable
90 #define PROBE_INTERVAL 60
92 /* static variables and functions */
93 static int mobile_node = 0;
94 static const char *pidfilename = RTSOL_PIDFILE;
98 static const char *dumpfilename = RTSOL_DUMPFILE;
102 static int ifreconfig(char *);
105 static int make_packet(struct ifinfo *);
106 static struct timespec *rtsol_check_timer(void);
109 static void rtsold_set_dump_file(int);
111 static void usage(void);
114 main(int argc, char **argv)
117 struct timespec *timeout;
119 struct pollfd set[2];
125 opts = "adDfFm1O:p:R:u";
134 while ((ch = getopt(argc, argv, opts)) != -1) {
158 otherconf_script = optarg;
161 pidfilename = optarg;
164 resolvconf_script = optarg;
177 if ((!aflag && argc == 0) || (aflag && argc != 0)) {
182 /* Generate maximum time in timespec. */
183 tm_max.tv_sec = (-1) & ~((time_t)1 << ((sizeof(tm_max.tv_sec) * 8) - 1));
184 tm_max.tv_nsec = (-1) & ~((long)1 << ((sizeof(tm_max.tv_nsec) * 8) - 1));
188 log_upto = LOG_DEBUG;
192 log_upto = LOG_NOTICE;
197 ident = strrchr(argv0, '/');
202 openlog(ident, LOG_NDELAY|LOG_PID, LOG_DAEMON);
204 setlogmask(LOG_UPTO(log_upto));
207 if (otherconf_script && *otherconf_script != '/') {
208 errx(1, "configuration script (%s) must be an absolute path",
211 if (resolvconf_script && *resolvconf_script != '/') {
212 errx(1, "configuration script (%s) must be an absolute path",
215 if (pidfilename && *pidfilename != '/') {
216 errx(1, "pid filename (%s) must be an absolute path",
220 #if (__FreeBSD_version < 900000)
222 setinet6sysctl(IPV6CTL_FORWARDING, 0);
224 /* warn if forwarding is up */
225 if (getinet6sysctl(IPV6CTL_FORWARDING))
226 warnx("kernel is configured as a router, not a host");
231 /* initialization to dump internal status to a file */
232 signal(SIGUSR1, rtsold_set_dump_file);
236 daemon(0, 0); /* act as a daemon */
239 * Open a socket for sending RS and receiving RA.
240 * This should be done before calling ifinit(), since the function
243 if ((s = sockopen()) < 0) {
244 warnmsg(LOG_ERR, __func__, "failed to open a socket");
248 set[0].events = POLLIN;
251 if ((rtsock = rtsock_open()) < 0) {
252 warnmsg(LOG_ERR, __func__, "failed to open a socket");
256 set[1].events = POLLIN;
258 /* configuration per interface */
260 warnmsg(LOG_ERR, __func__,
261 "failed to initialize interfaces");
265 argv = autoifprobe();
266 while (argv && *argv) {
267 if (ifconfig(*argv)) {
268 warnmsg(LOG_ERR, __func__,
269 "failed to initialize %s", *argv);
275 /* setup for probing default routers */
277 warnmsg(LOG_ERR, __func__,
278 "failed to setup for probing routers");
283 /* dump the current pid */
285 pid_t pid = getpid();
288 if ((fp = fopen(pidfilename, "w")) == NULL)
289 warnmsg(LOG_ERR, __func__,
290 "failed to open a pid log file(%s): %s",
291 pidfilename, strerror(errno));
293 fprintf(fp, "%d\n", pid);
297 while (1) { /* main loop */
300 if (do_dump) { /* SIGUSR1 */
302 rtsold_dump_file(dumpfilename);
306 timeout = rtsol_check_timer();
311 /* if we have no timeout, we are done (or failed) */
315 /* if all interfaces have got RA packet, we are done */
316 TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
317 if (ifi->state != IFS_DOWN && ifi->racnt == 0)
323 e = poll(set, 2, timeout ? (timeout->tv_sec * 1000 + timeout->tv_nsec / 1000 / 1000) : INFTIM);
325 if (e < 0 && errno != EINTR) {
326 warnmsg(LOG_ERR, __func__, "select: %s",
332 /* packet reception */
333 if (set[1].revents & POLLIN)
334 rtsock_input(rtsock);
335 if (set[0].revents & POLLIN)
344 ifconfig(char *ifname)
347 struct sockaddr_dl *sdl;
350 if ((sdl = if_nametosdl(ifname)) == NULL) {
351 warnmsg(LOG_ERR, __func__,
352 "failed to get link layer information for %s", ifname);
355 if (find_ifinfo(sdl->sdl_index)) {
356 warnmsg(LOG_ERR, __func__,
357 "interface %s was already configured", ifname);
363 struct in6_ndireq nd;
366 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
367 warnmsg(LOG_ERR, __func__, "socket() failed.");
370 memset(&nd, 0, sizeof(nd));
371 strlcpy(nd.ifname, ifname, sizeof(nd.ifname));
372 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
373 warnmsg(LOG_ERR, __func__,
374 "cannot get accept_rtadv flag");
378 nd.ndi.flags |= ND6_IFF_ACCEPT_RTADV;
379 if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd) < 0) {
380 warnmsg(LOG_ERR, __func__,
381 "cannot set accept_rtadv flag");
388 if ((ifi = malloc(sizeof(*ifi))) == NULL) {
389 warnmsg(LOG_ERR, __func__, "memory allocation failed");
393 memset(ifi, 0, sizeof(*ifi));
395 ifi->ifi_rdnss = IFI_DNSOPT_STATE_NOINFO;
396 ifi->ifi_dnssl = IFI_DNSOPT_STATE_NOINFO;
397 TAILQ_INIT(&ifi->ifi_rainfo);
398 strlcpy(ifi->ifname, ifname, sizeof(ifi->ifname));
400 /* construct a router solicitation message */
401 if (make_packet(ifi))
404 /* set link ID of this interface. */
406 if (inet_zoneid(AF_INET6, 2, ifname, &ifi->linkid))
409 /* XXX: assume interface IDs as link IDs */
410 ifi->linkid = ifi->sdl->sdl_index;
414 * check if the interface is available.
415 * also check if SIOCGIFMEDIA ioctl is OK on the interface.
418 ifi->active = interface_status(ifi);
419 if (!ifi->mediareqok) {
421 * probe routers periodically even if the link status
424 ifi->probeinterval = PROBE_INTERVAL;
427 /* activate interface: interface_up returns 0 on success */
428 flags = interface_up(ifi->ifname);
430 ifi->state = IFS_DELAY;
431 else if (flags == IFS_TENTATIVE)
432 ifi->state = IFS_TENTATIVE;
434 ifi->state = IFS_DOWN;
436 rtsol_timer_update(ifi);
438 TAILQ_INSERT_TAIL(&ifinfo_head, ifi, ifi_next);
452 while ((ifi = TAILQ_FIRST(&ifinfo_head)) != NULL) {
453 TAILQ_REMOVE(&ifinfo_head, ifi, ifi_next);
454 if (ifi->sdl != NULL)
456 if (ifi->rs_data != NULL)
464 ifreconfig(char *ifname)
466 struct ifinfo *ifi, *prev;
470 TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
471 if (strncmp(ifi->ifname, ifname, sizeof(ifi->ifname)) == 0)
475 prev->next = ifi->next;
477 rv = ifconfig(ifname);
479 /* reclaim it after ifconfig() in case ifname is pointer inside ifi */
490 find_rainfo(struct ifinfo *ifi, struct sockaddr_in6 *sin6)
494 TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next)
495 if (memcmp(&rai->rai_saddr.sin6_addr, &sin6->sin6_addr,
496 sizeof(rai->rai_saddr.sin6_addr)) == 0)
503 find_ifinfo(int ifindex)
507 TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
508 if (ifi->sdl->sdl_index == ifindex)
515 make_packet(struct ifinfo *ifi)
517 size_t packlen = sizeof(struct nd_router_solicit), lladdroptlen = 0;
518 struct nd_router_solicit *rs;
521 if ((lladdroptlen = lladdropt_length(ifi->sdl)) == 0) {
522 warnmsg(LOG_INFO, __func__,
523 "link-layer address option has null length"
524 " on %s. Treat as not included.", ifi->ifname);
526 packlen += lladdroptlen;
527 ifi->rs_datalen = packlen;
529 /* allocate buffer */
530 if ((buf = malloc(packlen)) == NULL) {
531 warnmsg(LOG_ERR, __func__,
532 "memory allocation failed for %s", ifi->ifname);
537 /* fill in the message */
538 rs = (struct nd_router_solicit *)buf;
539 rs->nd_rs_type = ND_ROUTER_SOLICIT;
542 rs->nd_rs_reserved = 0;
545 /* fill in source link-layer address option */
547 lladdropt_fill(ifi->sdl, (struct nd_opt_hdr *)buf);
552 static struct timespec *
553 rtsol_check_timer(void)
555 static struct timespec returnval;
556 struct timespec now, rtsol_timer;
559 struct ra_opt *rao, *raotmp;
562 clock_gettime(CLOCK_MONOTONIC_FAST, &now);
564 rtsol_timer = tm_max;
566 TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
567 if (TS_CMP(&ifi->expire, &now, <=)) {
568 warnmsg(LOG_DEBUG, __func__, "timer expiration on %s, "
569 "state = %d", ifi->ifname, ifi->state);
571 while((rai = TAILQ_FIRST(&ifi->ifi_rainfo)) != NULL) {
572 /* Remove all RA options. */
573 TAILQ_REMOVE(&ifi->ifi_rainfo, rai, rai_next);
574 while ((rao = TAILQ_FIRST(&rai->rai_ra_opt)) !=
576 TAILQ_REMOVE(&rai->rai_ra_opt, rao,
578 if (rao->rao_msg != NULL)
584 switch (ifi->state) {
587 /* interface_up returns 0 on success */
588 flags = interface_up(ifi->ifname);
590 ifi->state = IFS_DELAY;
591 else if (flags == IFS_TENTATIVE)
592 ifi->state = IFS_TENTATIVE;
594 ifi->state = IFS_DOWN;
598 int oldstatus = ifi->active;
601 ifi->active = interface_status(ifi);
603 if (oldstatus != ifi->active) {
604 warnmsg(LOG_DEBUG, __func__,
605 "%s status is changed"
608 oldstatus, ifi->active);
610 ifi->state = IFS_DELAY;
611 } else if (ifi->probeinterval &&
613 ifi->timer.tv_sec) <= 0) {
614 /* probe timer expired */
618 ifi->state = IFS_PROBE;
622 * If we need a probe, clear the previous
623 * status wrt the "other" configuration.
626 ifi->otherconfig = 0;
628 if (probe && mobile_node)
629 defrouter_probe(ifi);
633 ifi->state = IFS_PROBE;
637 if (ifi->probes < MAX_RTR_SOLICITATIONS)
640 warnmsg(LOG_INFO, __func__,
641 "No answer after sending %d RSs",
644 ifi->state = IFS_IDLE;
648 rtsol_timer_update(ifi);
650 /* Expiration check for RA options. */
653 TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next) {
654 TAILQ_FOREACH_SAFE(rao, &rai->rai_ra_opt,
656 warnmsg(LOG_DEBUG, __func__,
657 "RA expiration timer: "
658 "type=%d, msg=%s, expire=%s",
659 rao->rao_type, (char *)rao->rao_msg,
660 sec2str(&rao->rao_expire));
661 if (TS_CMP(&now, &rao->rao_expire,
663 warnmsg(LOG_DEBUG, __func__,
664 "RA expiration timer: "
666 TAILQ_REMOVE(&rai->rai_ra_opt,
668 if (rao->rao_msg != NULL)
678 if (TS_CMP(&ifi->expire, &rtsol_timer, <))
679 rtsol_timer = ifi->expire;
682 if (TS_CMP(&rtsol_timer, &tm_max, ==)) {
683 warnmsg(LOG_DEBUG, __func__, "there is no timer");
685 } else if (TS_CMP(&rtsol_timer, &now, <))
686 /* this may occur when the interval is too small */
687 returnval.tv_sec = returnval.tv_nsec = 0;
689 TS_SUB(&rtsol_timer, &now, &returnval);
691 now.tv_sec += returnval.tv_sec;
692 now.tv_nsec += returnval.tv_nsec;
693 warnmsg(LOG_DEBUG, __func__, "New timer is %s",
700 rtsol_timer_update(struct ifinfo *ifi)
702 #define MILLION 1000000
703 #define DADRETRY 10 /* XXX: adhoc */
707 bzero(&ifi->timer, sizeof(ifi->timer));
709 switch (ifi->state) {
712 if (++ifi->dadcount > DADRETRY) {
714 ifi->timer.tv_sec = PROBE_INTERVAL;
716 ifi->timer.tv_sec = 1;
720 /* XXX should be configurable */
721 ifi->timer.tv_sec = 3;
724 ifi->timer = tm_max; /* stop timer(valid?) */
727 interval = arc4random_uniform(MAX_RTR_SOLICITATION_DELAY * MILLION);
728 ifi->timer.tv_sec = interval / MILLION;
729 ifi->timer.tv_nsec = (interval % MILLION) * 1000;
732 if (ifi->probes < MAX_RTR_SOLICITATIONS)
733 ifi->timer.tv_sec = RTR_SOLICITATION_INTERVAL;
736 * After sending MAX_RTR_SOLICITATIONS solicitations,
737 * we're just waiting for possible replies; there
738 * will be no more solicitation. Thus, we change
739 * the timer value to MAX_RTR_SOLICITATION_DELAY based
740 * on RFC 2461, Section 6.3.7.
742 ifi->timer.tv_sec = MAX_RTR_SOLICITATION_DELAY;
746 warnmsg(LOG_ERR, __func__,
747 "illegal interface state(%d) on %s",
748 ifi->state, ifi->ifname);
752 /* reset the timer */
753 if (TS_CMP(&ifi->timer, &tm_max, ==)) {
754 ifi->expire = tm_max;
755 warnmsg(LOG_DEBUG, __func__,
756 "stop timer for %s", ifi->ifname);
758 clock_gettime(CLOCK_MONOTONIC_FAST, &now);
759 TS_ADD(&now, &ifi->timer, &ifi->expire);
761 now.tv_sec += ifi->timer.tv_sec;
762 now.tv_nsec += ifi->timer.tv_nsec;
763 warnmsg(LOG_DEBUG, __func__, "set timer for %s to %s",
764 ifi->ifname, sec2str(&now));
770 /* timer related utility functions */
771 #define MILLION 1000000
775 rtsold_set_dump_file(int sig __unused)
785 fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] "
786 "[-p pidfile] [-R script-name] interface ...\n");
787 fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] "
788 "[-p pidfile] [-R script-name] -a\n");
790 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
791 "[-p pidfile] [-R script-name] interface ...\n");
792 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
793 "[-p pidfile] [-R script-name] -a\n");
798 warnmsg(int priority, const char *func, const char *msg, ...)
805 if (priority <= log_upto) {
806 (void)vfprintf(stderr, msg, ap);
807 (void)fprintf(stderr, "\n");
810 snprintf(buf, sizeof(buf), "<%s> %s", func, msg);
812 vsyslog(priority, msg, ap);
818 * return a list of interfaces which is suitable to sending an RS.
823 static char **argv = NULL;
827 struct ifaddrs *ifap, *ifa;
828 struct in6_ndireq nd;
839 if (getifaddrs(&ifap) != 0)
842 if (!Fflag && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
843 warnmsg(LOG_ERR, __func__, "socket");
847 /* find an ethernet */
848 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
849 if ((ifa->ifa_flags & IFF_UP) == 0)
851 if ((ifa->ifa_flags & IFF_POINTOPOINT) != 0)
853 if ((ifa->ifa_flags & IFF_LOOPBACK) != 0)
855 if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
858 if (ifa->ifa_addr->sa_family != AF_INET6)
862 for (i = 0; i < n; i++) {
863 if (strcmp(argv[i], ifa->ifa_name) == 0) {
872 * Skip the interfaces which IPv6 and/or accepting RA
876 memset(&nd, 0, sizeof(nd));
877 strlcpy(nd.ifname, ifa->ifa_name, sizeof(nd.ifname));
878 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
879 warnmsg(LOG_ERR, __func__,
880 "ioctl(SIOCGIFINFO_IN6)");
883 if ((nd.ndi.flags & ND6_IFF_IFDISABLED))
885 if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV))
889 /* if we find multiple candidates, just warn. */
890 if (n != 0 && dflag > 1)
891 warnmsg(LOG_WARNING, __func__,
892 "multiple interfaces found");
894 a = realloc(argv, (n + 1) * sizeof(char *));
896 warnmsg(LOG_ERR, __func__, "realloc");
900 argv[n] = strdup(ifa->ifa_name);
902 warnmsg(LOG_ERR, __func__, "malloc");
909 a = realloc(argv, (n + 1) * sizeof(char *));
911 warnmsg(LOG_ERR, __func__, "realloc");
918 for (i = 0; i < n; i++)
919 warnmsg(LOG_WARNING, __func__, "probing %s",