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/param.h>
37 #include <sys/capsicum.h>
38 #include <sys/event.h>
39 #include <sys/ioctl.h>
40 #include <sys/socket.h>
43 #include <net/if_dl.h>
45 #include <netinet/in.h>
46 #include <netinet/icmp6.h>
47 #include <netinet/in_var.h>
48 #include <arpa/inet.h>
50 #include <netinet6/nd6.h>
52 #include <capsicum_helpers.h>
66 #include <libcasper.h>
67 #include <casper/cap_syslog.h>
72 #define RTSOL_DUMPFILE "/var/run/rtsold.dump"
74 struct timespec tm_max;
75 static int log_upto = 999;
78 int Fflag = 0; /* force setting sysctl parameters */
83 const char *otherconf_script;
84 const char *resolvconf_script = "/sbin/resolvconf";
86 cap_channel_t *capllflags, *capscript, *capsendmsg, *capsyslog;
88 /* protocol constants */
89 #define MAX_RTR_SOLICITATION_DELAY 1 /* second */
90 #define RTR_SOLICITATION_INTERVAL 4 /* seconds */
91 #define MAX_RTR_SOLICITATIONS 3 /* times */
94 * implementation dependent constants in seconds
95 * XXX: should be configurable
97 #define PROBE_INTERVAL 60
99 /* static variables and functions */
100 static int mobile_node = 0;
102 static sig_atomic_t do_dump, do_exit;
103 static struct pidfh *pfh;
105 static char **autoifprobe(void);
106 static int ifconfig(char *ifname);
107 static int init_capabilities(void);
108 static int make_packet(struct ifinfo *);
109 static struct timespec *rtsol_check_timer(void);
111 static void set_dumpfile(int);
112 static void set_exit(int);
113 static void usage(const char *progname);
116 main(int argc, char **argv)
118 struct kevent events[2];
121 struct timespec *timeout;
122 const char *opts, *pidfilepath, *progname;
123 int ch, error, kq, once, rcvsock, rtsock;
125 progname = basename(argv[0]);
126 if (strcmp(progname, "rtsold") == 0) {
127 opts = "adDfFm1O:p:R:u";
136 while ((ch = getopt(argc, argv, opts)) != -1) {
160 otherconf_script = optarg;
163 pidfilepath = optarg;
166 resolvconf_script = optarg;
178 if ((!aflag && argc == 0) || (aflag && argc != 0))
181 /* Generate maximum time in timespec. */
182 tm_max.tv_sec = (-1) & ~((time_t)1 << ((sizeof(tm_max.tv_sec) * 8) - 1));
183 tm_max.tv_nsec = (-1) & ~((long)1 << ((sizeof(tm_max.tv_nsec) * 8) - 1));
187 log_upto = LOG_DEBUG;
191 log_upto = LOG_NOTICE;
193 if (otherconf_script != NULL && *otherconf_script != '/')
194 errx(1, "configuration script (%s) must be an absolute path",
196 if (*resolvconf_script != '/')
197 errx(1, "configuration script (%s) must be an absolute path",
201 pfh = pidfile_open(pidfilepath, 0644, NULL);
203 errx(1, "failed to open pidfile: %s", strerror(errno));
204 if (daemon(0, 0) != 0)
205 errx(1, "failed to daemonize");
208 if ((error = init_capabilities()) != 0)
209 err(1, "failed to initialize capabilities");
212 cap_openlog(capsyslog, progname, LOG_NDELAY | LOG_PID,
215 (void)cap_setlogmask(capsyslog, LOG_UPTO(log_upto));
216 (void)signal(SIGTERM, set_exit);
217 (void)signal(SIGINT, set_exit);
218 (void)signal(SIGUSR1, set_dumpfile);
219 dumpfp = rtsold_init_dumpfile(RTSOL_DUMPFILE);
225 warnmsg(LOG_ERR, __func__, "failed to create a kqueue: %s",
230 /* Open global sockets and register for read events. */
231 if ((rtsock = rtsock_open()) < 0) {
232 warnmsg(LOG_ERR, __func__, "failed to open routing socket");
235 if ((rcvsock = recvsockopen()) < 0) {
236 warnmsg(LOG_ERR, __func__, "failed to open receive socket");
239 EV_SET(&events[0], rtsock, EVFILT_READ, EV_ADD, 0, 0, NULL);
240 EV_SET(&events[1], rcvsock, EVFILT_READ, EV_ADD, 0, 0, NULL);
241 if (kevent(kq, events, 2, NULL, 0, NULL) < 0) {
242 warnmsg(LOG_ERR, __func__, "kevent(): %s", strerror(errno));
246 /* Probe network interfaces and set up tracking info. */
248 warnmsg(LOG_ERR, __func__, "failed to initialize interfaces");
252 argv = autoifprobe();
253 while (argv && *argv) {
254 if (ifconfig(*argv)) {
255 warnmsg(LOG_ERR, __func__,
256 "failed to initialize %s", *argv);
262 /* Write to our pidfile. */
263 if (pfh != NULL && pidfile_write(pfh) != 0) {
264 warnmsg(LOG_ERR, __func__,
265 "failed to open pidfile: %s", strerror(errno));
269 /* Enter capability mode. */
270 caph_cache_catpages();
271 if (caph_enter_casper() != 0) {
272 warnmsg(LOG_ERR, __func__, "caph_enter(): %s", strerror(errno));
278 /* Handle SIGTERM, SIGINT. */
284 /* Handle SIGUSR1. */
290 timeout = rtsol_check_timer();
293 /* if we have no timeout, we are done (or failed) */
297 /* if all interfaces have got RA packet, we are done */
298 TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
299 if (ifi->state != IFS_DOWN && ifi->racnt == 0)
306 error = kevent(kq, NULL, 0, &events[0], 1, timeout);
308 if (error < 0 && errno != EINTR)
309 warnmsg(LOG_ERR, __func__, "kevent(): %s",
314 if (events[0].ident == (uintptr_t)rtsock)
315 rtsock_input(rtsock);
317 rtsol_input(rcvsock);
324 init_capabilities(void)
327 const char *const scripts[2] = { resolvconf_script, otherconf_script };
328 cap_channel_t *capcasper;
331 capcasper = cap_init();
332 if (capcasper == NULL)
335 capllflags = cap_service_open(capcasper, "rtsold.llflags");
336 if (capllflags == NULL)
339 capscript = cap_service_open(capcasper, "rtsold.script");
340 if (capscript == NULL)
342 limits = nvlist_create(0);
343 nvlist_add_string_array(limits, "scripts", scripts,
344 otherconf_script != NULL ? 2 : 1);
345 if (cap_limit_set(capscript, limits) != 0)
348 capsendmsg = cap_service_open(capcasper, "rtsold.sendmsg");
349 if (capsendmsg == NULL)
353 capsyslog = cap_service_open(capcasper, "system.syslog");
354 if (capsyslog == NULL)
358 cap_close(capcasper);
359 #endif /* WITH_CASPER */
364 ifconfig(char *ifname)
367 struct sockaddr_dl *sdl;
371 if ((sdl = if_nametosdl(ifname)) == NULL) {
372 warnmsg(LOG_ERR, __func__,
373 "failed to get link layer information for %s", ifname);
376 if (find_ifinfo(sdl->sdl_index)) {
377 warnmsg(LOG_ERR, __func__,
378 "interface %s was already configured", ifname);
383 struct in6_ndireq nd;
386 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
387 warnmsg(LOG_ERR, __func__, "socket() failed.");
390 memset(&nd, 0, sizeof(nd));
391 strlcpy(nd.ifname, ifname, sizeof(nd.ifname));
392 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
393 warnmsg(LOG_ERR, __func__,
394 "cannot get accept_rtadv flag");
398 nd.ndi.flags |= ND6_IFF_ACCEPT_RTADV;
399 if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd) < 0) {
400 warnmsg(LOG_ERR, __func__,
401 "cannot set accept_rtadv flag");
408 if ((ifi = malloc(sizeof(*ifi))) == NULL) {
409 warnmsg(LOG_ERR, __func__, "memory allocation failed");
412 memset(ifi, 0, sizeof(*ifi));
414 ifi->ifi_rdnss = IFI_DNSOPT_STATE_NOINFO;
415 ifi->ifi_dnssl = IFI_DNSOPT_STATE_NOINFO;
416 TAILQ_INIT(&ifi->ifi_rainfo);
417 strlcpy(ifi->ifname, ifname, sizeof(ifi->ifname));
419 /* construct a router solicitation message */
420 if (make_packet(ifi))
423 /* set link ID of this interface. */
425 if (inet_zoneid(AF_INET6, 2, ifname, &ifi->linkid))
428 /* XXX: assume interface IDs as link IDs */
429 ifi->linkid = ifi->sdl->sdl_index;
433 * check if the interface is available.
434 * also check if SIOCGIFMEDIA ioctl is OK on the interface.
437 ifi->active = interface_status(ifi);
438 if (!ifi->mediareqok) {
440 * probe routers periodically even if the link status
443 ifi->probeinterval = PROBE_INTERVAL;
446 /* activate interface: interface_up returns 0 on success */
447 flags = interface_up(ifi->ifname);
449 ifi->state = IFS_DELAY;
450 else if (flags == IFS_TENTATIVE)
451 ifi->state = IFS_TENTATIVE;
453 ifi->state = IFS_DOWN;
455 rtsol_timer_update(ifi);
457 TAILQ_INSERT_TAIL(&ifinfo_head, ifi, ifi_next);
467 find_rainfo(struct ifinfo *ifi, struct sockaddr_in6 *sin6)
471 TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next)
472 if (memcmp(&rai->rai_saddr.sin6_addr, &sin6->sin6_addr,
473 sizeof(rai->rai_saddr.sin6_addr)) == 0)
480 find_ifinfo(int ifindex)
484 TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
485 if (ifi->sdl->sdl_index == ifindex)
492 make_packet(struct ifinfo *ifi)
494 size_t packlen = sizeof(struct nd_router_solicit), lladdroptlen = 0;
495 struct nd_router_solicit *rs;
498 if ((lladdroptlen = lladdropt_length(ifi->sdl)) == 0) {
499 warnmsg(LOG_INFO, __func__,
500 "link-layer address option has null length"
501 " on %s. Treat as not included.", ifi->ifname);
503 packlen += lladdroptlen;
504 ifi->rs_datalen = packlen;
506 /* allocate buffer */
507 if ((buf = malloc(packlen)) == NULL) {
508 warnmsg(LOG_ERR, __func__,
509 "memory allocation failed for %s", ifi->ifname);
514 /* fill in the message */
515 rs = (struct nd_router_solicit *)buf;
516 rs->nd_rs_type = ND_ROUTER_SOLICIT;
519 rs->nd_rs_reserved = 0;
522 /* fill in source link-layer address option */
524 lladdropt_fill(ifi->sdl, (struct nd_opt_hdr *)buf);
529 static struct timespec *
530 rtsol_check_timer(void)
532 static struct timespec returnval;
533 struct timespec now, rtsol_timer;
536 struct ra_opt *rao, *raotmp;
539 clock_gettime(CLOCK_MONOTONIC_FAST, &now);
541 rtsol_timer = tm_max;
543 TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
544 if (TS_CMP(&ifi->expire, &now, <=)) {
545 warnmsg(LOG_DEBUG, __func__, "timer expiration on %s, "
546 "state = %d", ifi->ifname, ifi->state);
548 while((rai = TAILQ_FIRST(&ifi->ifi_rainfo)) != NULL) {
549 /* Remove all RA options. */
550 TAILQ_REMOVE(&ifi->ifi_rainfo, rai, rai_next);
551 while ((rao = TAILQ_FIRST(&rai->rai_ra_opt)) !=
553 TAILQ_REMOVE(&rai->rai_ra_opt, rao,
555 if (rao->rao_msg != NULL)
561 switch (ifi->state) {
564 /* interface_up returns 0 on success */
565 flags = interface_up(ifi->ifname);
567 ifi->state = IFS_DELAY;
568 else if (flags == IFS_TENTATIVE)
569 ifi->state = IFS_TENTATIVE;
571 ifi->state = IFS_DOWN;
575 int oldstatus = ifi->active;
578 ifi->active = interface_status(ifi);
580 if (oldstatus != ifi->active) {
581 warnmsg(LOG_DEBUG, __func__,
582 "%s status is changed"
585 oldstatus, ifi->active);
587 ifi->state = IFS_DELAY;
588 } else if (ifi->probeinterval &&
590 ifi->timer.tv_sec) <= 0) {
591 /* probe timer expired */
595 ifi->state = IFS_PROBE;
599 * If we need a probe, clear the previous
600 * status wrt the "other" configuration.
603 ifi->otherconfig = 0;
604 if (probe && mobile_node) {
605 error = cap_probe_defrouters(capsendmsg,
608 warnmsg(LOG_DEBUG, __func__,
609 "failed to probe routers: %d",
615 ifi->state = IFS_PROBE;
616 (void)cap_rssend(capsendmsg, ifi);
619 if (ifi->probes < MAX_RTR_SOLICITATIONS)
620 (void)cap_rssend(capsendmsg, ifi);
622 warnmsg(LOG_INFO, __func__,
623 "No answer after sending %d RSs",
626 ifi->state = IFS_IDLE;
630 rtsol_timer_update(ifi);
632 /* Expiration check for RA options. */
635 TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next) {
636 TAILQ_FOREACH_SAFE(rao, &rai->rai_ra_opt,
638 warnmsg(LOG_DEBUG, __func__,
639 "RA expiration timer: "
640 "type=%d, msg=%s, expire=%s",
641 rao->rao_type, (char *)rao->rao_msg,
642 sec2str(&rao->rao_expire));
643 if (TS_CMP(&now, &rao->rao_expire,
645 warnmsg(LOG_DEBUG, __func__,
646 "RA expiration timer: "
648 TAILQ_REMOVE(&rai->rai_ra_opt,
650 if (rao->rao_msg != NULL)
660 if (TS_CMP(&ifi->expire, &rtsol_timer, <))
661 rtsol_timer = ifi->expire;
664 if (TS_CMP(&rtsol_timer, &tm_max, ==)) {
665 warnmsg(LOG_DEBUG, __func__, "there is no timer");
667 } else if (TS_CMP(&rtsol_timer, &now, <))
668 /* this may occur when the interval is too small */
669 returnval.tv_sec = returnval.tv_nsec = 0;
671 TS_SUB(&rtsol_timer, &now, &returnval);
673 now.tv_sec += returnval.tv_sec;
674 now.tv_nsec += returnval.tv_nsec;
675 warnmsg(LOG_DEBUG, __func__, "New timer is %s",
682 rtsol_timer_update(struct ifinfo *ifi)
684 #define MILLION 1000000
685 #define DADRETRY 10 /* XXX: adhoc */
689 bzero(&ifi->timer, sizeof(ifi->timer));
691 switch (ifi->state) {
694 if (++ifi->dadcount > DADRETRY) {
696 ifi->timer.tv_sec = PROBE_INTERVAL;
698 ifi->timer.tv_sec = 1;
702 /* XXX should be configurable */
703 ifi->timer.tv_sec = 3;
705 ifi->timer = tm_max; /* stop timer(valid?) */
708 interval = arc4random_uniform(MAX_RTR_SOLICITATION_DELAY * MILLION);
709 ifi->timer.tv_sec = interval / MILLION;
710 ifi->timer.tv_nsec = (interval % MILLION) * 1000;
713 if (ifi->probes < MAX_RTR_SOLICITATIONS)
714 ifi->timer.tv_sec = RTR_SOLICITATION_INTERVAL;
717 * After sending MAX_RTR_SOLICITATIONS solicitations,
718 * we're just waiting for possible replies; there
719 * will be no more solicitation. Thus, we change
720 * the timer value to MAX_RTR_SOLICITATION_DELAY based
721 * on RFC 2461, Section 6.3.7.
723 ifi->timer.tv_sec = MAX_RTR_SOLICITATION_DELAY;
726 warnmsg(LOG_ERR, __func__,
727 "illegal interface state(%d) on %s",
728 ifi->state, ifi->ifname);
732 /* reset the timer */
733 if (TS_CMP(&ifi->timer, &tm_max, ==)) {
734 ifi->expire = tm_max;
735 warnmsg(LOG_DEBUG, __func__,
736 "stop timer for %s", ifi->ifname);
738 clock_gettime(CLOCK_MONOTONIC_FAST, &now);
739 TS_ADD(&now, &ifi->timer, &ifi->expire);
741 now.tv_sec += ifi->timer.tv_sec;
742 now.tv_nsec += ifi->timer.tv_nsec;
743 warnmsg(LOG_DEBUG, __func__, "set timer for %s to %s",
744 ifi->ifname, sec2str(&now));
751 set_dumpfile(int sig __unused)
758 set_exit(int sig __unused)
765 usage(const char *progname)
768 if (strcmp(progname, "rtsold") == 0) {
769 fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] "
770 "[-p pidfile] [-R script-name] interface ...\n");
771 fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] "
772 "[-p pidfile] [-R script-name] -a\n");
774 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
775 "[-p pidfile] [-R script-name] interface ...\n");
776 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
777 "[-p pidfile] [-R script-name] -a\n");
783 warnmsg(int priority, const char *func, const char *msg, ...)
790 if (priority <= log_upto)
793 snprintf(buf, sizeof(buf), "<%s> %s", func, msg);
795 cap_vsyslog(capsyslog, priority, msg, ap);
801 * return a list of interfaces which is suitable to sending an RS.
806 static char **argv = NULL;
810 struct ifaddrs *ifap, *ifa;
811 struct in6_ndireq nd;
822 if (getifaddrs(&ifap) != 0)
825 if (!Fflag && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
826 warnmsg(LOG_ERR, __func__, "socket");
830 /* find an ethernet */
831 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
832 if ((ifa->ifa_flags & IFF_UP) == 0)
834 if ((ifa->ifa_flags & IFF_POINTOPOINT) != 0)
836 if ((ifa->ifa_flags & IFF_LOOPBACK) != 0)
838 if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
841 if (ifa->ifa_addr->sa_family != AF_INET6)
845 for (i = 0; i < n; i++) {
846 if (strcmp(argv[i], ifa->ifa_name) == 0) {
855 * Skip the interfaces which IPv6 and/or accepting RA
859 memset(&nd, 0, sizeof(nd));
860 strlcpy(nd.ifname, ifa->ifa_name, sizeof(nd.ifname));
861 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
862 warnmsg(LOG_ERR, __func__,
863 "ioctl(SIOCGIFINFO_IN6)");
866 if ((nd.ndi.flags & ND6_IFF_IFDISABLED))
868 if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV))
872 /* if we find multiple candidates, just warn. */
873 if (n != 0 && dflag > 1)
874 warnmsg(LOG_WARNING, __func__,
875 "multiple interfaces found");
877 a = realloc(argv, (n + 1) * sizeof(char *));
879 warnmsg(LOG_ERR, __func__, "realloc");
883 argv[n] = strdup(ifa->ifa_name);
885 warnmsg(LOG_ERR, __func__, "malloc");
892 a = realloc(argv, (n + 1) * sizeof(char *));
894 warnmsg(LOG_ERR, __func__, "realloc");
901 for (i = 0; i < n; i++)
902 warnmsg(LOG_WARNING, __func__, "probing %s",