rtsold.c revision 253995 
1/*	$KAME: rtsold.c,v 1.67 2003/05/17 18:16:15 itojun Exp $	*/
2
3/*
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * $FreeBSD: head/usr.sbin/rtsold/rtsold.c 253995 2013-08-06 15:49:18Z hrs $
32 */
33
34#include <sys/types.h>
35#include <sys/ioctl.h>
36#include <sys/socket.h>
37#include <sys/param.h>
38
39#include <net/if.h>
40#include <net/if_dl.h>
41#include <net/if_var.h>
42
43#include <netinet/in.h>
44#include <netinet/icmp6.h>
45#include <netinet/in_var.h>
46#include <arpa/inet.h>
47
48#include <netinet6/nd6.h>
49
50#include <signal.h>
51#include <unistd.h>
52#include <syslog.h>
53#include <string.h>
54#include <stdlib.h>
55#include <stdio.h>
56#include <time.h>
57#include <errno.h>
58#include <err.h>
59#include <stdarg.h>
60#include <ifaddrs.h>
61#ifdef HAVE_POLL_H
62#include <poll.h>
63#endif
64
65#include "rtsold.h"
66
67#define RTSOL_DUMPFILE	"/var/run/rtsold.dump";
68#define RTSOL_PIDFILE	"/var/run/rtsold.pid";
69
70struct ifinfo *iflist;
71struct timespec tm_max;
72static int log_upto = 999;
73static int fflag = 0;
74
75int Fflag = 0;	/* force setting sysctl parameters */
76int aflag = 0;
77int dflag = 0;
78int uflag = 0;
79
80const char *otherconf_script;
81const char *resolvconf_script = "/sbin/resolvconf";
82
83/* protocol constants */
84#define MAX_RTR_SOLICITATION_DELAY	1 /* second */
85#define RTR_SOLICITATION_INTERVAL	4 /* seconds */
86#define MAX_RTR_SOLICITATIONS		3 /* times */
87
88/*
89 * implementation dependent constants in seconds
90 * XXX: should be configurable
91 */
92#define PROBE_INTERVAL 60
93
94/* static variables and functions */
95static int mobile_node = 0;
96static const char *pidfilename = RTSOL_PIDFILE;
97
98#ifndef SMALL
99static int do_dump;
100static const char *dumpfilename = RTSOL_DUMPFILE;
101#endif
102
103#if 0
104static int ifreconfig(char *);
105#endif
106
107static int make_packet(struct ifinfo *);
108static struct timespec *rtsol_check_timer(void);
109
110#ifndef SMALL
111static void rtsold_set_dump_file(int);
112#endif
113static void usage(void);
114
115int
116main(int argc, char **argv)
117{
118	int s, ch, once = 0;
119	struct timespec *timeout;
120	const char *opts;
121#ifdef HAVE_POLL_H
122	struct pollfd set[2];
123#else
124	fd_set *fdsetp, *selectfdp;
125	int fdmasks;
126	int maxfd;
127#endif
128	int rtsock;
129	char *argv0;
130
131#ifndef SMALL
132	/* rtsold */
133	opts = "adDfFm1O:p:R:u";
134#else
135	/* rtsol */
136	opts = "adDFO:R:u";
137	fflag = 1;
138	once = 1;
139#endif
140	argv0 = argv[0];
141
142	while ((ch = getopt(argc, argv, opts)) != -1) {
143		switch (ch) {
144		case 'a':
145			aflag = 1;
146			break;
147		case 'd':
148			dflag += 1;
149			break;
150		case 'D':
151			dflag += 2;
152			break;
153		case 'f':
154			fflag = 1;
155			break;
156		case 'F':
157			Fflag = 1;
158			break;
159		case 'm':
160			mobile_node = 1;
161			break;
162		case '1':
163			once = 1;
164			break;
165		case 'O':
166			otherconf_script = optarg;
167			break;
168		case 'p':
169			pidfilename = optarg;
170			break;
171		case 'R':
172			resolvconf_script = optarg;
173			break;
174		case 'u':
175			uflag = 1;
176			break;
177		default:
178			usage();
179			exit(1);
180		}
181	}
182	argc -= optind;
183	argv += optind;
184
185	if ((!aflag && argc == 0) || (aflag && argc != 0)) {
186		usage();
187		exit(1);
188	}
189
190	/* Generate maximum time in timespec. */
191	tm_max.tv_sec = (-1) & ~((time_t)1 << ((sizeof(tm_max.tv_sec) * 8) - 1));
192	tm_max.tv_nsec = (-1) & ~((long)1 << ((sizeof(tm_max.tv_nsec) * 8) - 1));
193
194	/* set log level */
195	if (dflag > 1)
196		log_upto = LOG_DEBUG;
197	else if (dflag > 0)
198		log_upto = LOG_INFO;
199	else
200		log_upto = LOG_NOTICE;
201
202	if (!fflag) {
203		char *ident;
204
205		ident = strrchr(argv0, '/');
206		if (!ident)
207			ident = argv0;
208		else
209			ident++;
210		openlog(ident, LOG_NDELAY|LOG_PID, LOG_DAEMON);
211		if (log_upto >= 0)
212			setlogmask(LOG_UPTO(log_upto));
213	}
214
215	if (otherconf_script && *otherconf_script != '/') {
216		errx(1, "configuration script (%s) must be an absolute path",
217		    otherconf_script);
218	}
219	if (resolvconf_script && *resolvconf_script != '/') {
220		errx(1, "configuration script (%s) must be an absolute path",
221		    resolvconf_script);
222	}
223	if (pidfilename && *pidfilename != '/') {
224		errx(1, "pid filename (%s) must be an absolute path",
225		    pidfilename);
226	}
227#ifndef HAVE_ARC4RANDOM
228	/* random value initialization */
229	srandom((u_long)time(NULL));
230#endif
231
232#if (__FreeBSD_version < 900000)
233	if (Fflag) {
234		setinet6sysctl(IPV6CTL_FORWARDING, 0);
235	} else {
236		/* warn if forwarding is up */
237		if (getinet6sysctl(IPV6CTL_FORWARDING))
238			warnx("kernel is configured as a router, not a host");
239	}
240#endif
241
242#ifndef SMALL
243	/* initialization to dump internal status to a file */
244	signal(SIGUSR1, rtsold_set_dump_file);
245#endif
246
247	if (!fflag)
248		daemon(0, 0);		/* act as a daemon */
249
250	/*
251	 * Open a socket for sending RS and receiving RA.
252	 * This should be done before calling ifinit(), since the function
253	 * uses the socket.
254	 */
255	if ((s = sockopen()) < 0) {
256		warnmsg(LOG_ERR, __func__, "failed to open a socket");
257		exit(1);
258	}
259#ifdef HAVE_POLL_H
260	set[0].fd = s;
261	set[0].events = POLLIN;
262#else
263	maxfd = s;
264#endif
265
266#ifdef HAVE_POLL_H
267	set[1].fd = -1;
268#endif
269
270	if ((rtsock = rtsock_open()) < 0) {
271		warnmsg(LOG_ERR, __func__, "failed to open a socket");
272		exit(1);
273	}
274#ifdef HAVE_POLL_H
275	set[1].fd = rtsock;
276	set[1].events = POLLIN;
277#else
278	if (rtsock > maxfd)
279		maxfd = rtsock;
280#endif
281
282#ifndef HAVE_POLL_H
283	fdmasks = howmany(maxfd + 1, NFDBITS) * sizeof(fd_mask);
284	if ((fdsetp = malloc(fdmasks)) == NULL) {
285		warnmsg(LOG_ERR, __func__, "malloc");
286		exit(1);
287	}
288	if ((selectfdp = malloc(fdmasks)) == NULL) {
289		warnmsg(LOG_ERR, __func__, "malloc");
290		exit(1);
291	}
292#endif
293
294	/* configuration per interface */
295	if (ifinit()) {
296		warnmsg(LOG_ERR, __func__,
297		    "failed to initialize interfaces");
298		exit(1);
299	}
300	if (aflag)
301		argv = autoifprobe();
302	while (argv && *argv) {
303		if (ifconfig(*argv)) {
304			warnmsg(LOG_ERR, __func__,
305			    "failed to initialize %s", *argv);
306			exit(1);
307		}
308		argv++;
309	}
310
311	/* setup for probing default routers */
312	if (probe_init()) {
313		warnmsg(LOG_ERR, __func__,
314		    "failed to setup for probing routers");
315		exit(1);
316		/*NOTREACHED*/
317	}
318
319	/* dump the current pid */
320	if (!once) {
321		pid_t pid = getpid();
322		FILE *fp;
323
324		if ((fp = fopen(pidfilename, "w")) == NULL)
325			warnmsg(LOG_ERR, __func__,
326			    "failed to open a pid log file(%s): %s",
327			    pidfilename, strerror(errno));
328		else {
329			fprintf(fp, "%d\n", pid);
330			fclose(fp);
331		}
332	}
333#ifndef HAVE_POLL_H
334	memset(fdsetp, 0, fdmasks);
335	FD_SET(s, fdsetp);
336	FD_SET(rtsock, fdsetp);
337#endif
338	while (1) {		/* main loop */
339		int e;
340
341#ifndef HAVE_POLL_H
342		memcpy(selectfdp, fdsetp, fdmasks);
343#endif
344
345#ifndef SMALL
346		if (do_dump) {	/* SIGUSR1 */
347			do_dump = 0;
348			rtsold_dump_file(dumpfilename);
349		}
350#endif
351
352		timeout = rtsol_check_timer();
353
354		if (once) {
355			struct ifinfo *ifi;
356
357			/* if we have no timeout, we are done (or failed) */
358			if (timeout == NULL)
359				break;
360
361			/* if all interfaces have got RA packet, we are done */
362			TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
363				if (ifi->state != IFS_DOWN && ifi->racnt == 0)
364					break;
365			}
366			if (ifi == NULL)
367				break;
368		}
369#ifdef HAVE_POLL_H
370		e = poll(set, 2, timeout ? (timeout->tv_sec * 1000 + timeout->tv_nsec / 1000 / 1000) : INFTIM);
371#else
372		e = select(maxfd + 1, selectfdp, NULL, NULL, timeout);
373#endif
374		if (e < 1) {
375			if (e < 0 && errno != EINTR) {
376				warnmsg(LOG_ERR, __func__, "select: %s",
377				    strerror(errno));
378			}
379			continue;
380		}
381
382		/* packet reception */
383#ifdef HAVE_POLL_H
384		if (set[1].revents & POLLIN)
385#else
386		if (FD_ISSET(rtsock, selectfdp))
387#endif
388			rtsock_input(rtsock);
389#ifdef HAVE_POLL_H
390		if (set[0].revents & POLLIN)
391#else
392		if (FD_ISSET(s, selectfdp))
393#endif
394			rtsol_input(s);
395	}
396	/* NOTREACHED */
397
398	return (0);
399}
400
401int
402ifconfig(char *ifname)
403{
404	struct ifinfo *ifi;
405	struct sockaddr_dl *sdl;
406	int flags;
407
408	if ((sdl = if_nametosdl(ifname)) == NULL) {
409		warnmsg(LOG_ERR, __func__,
410		    "failed to get link layer information for %s", ifname);
411		return (-1);
412	}
413	if (find_ifinfo(sdl->sdl_index)) {
414		warnmsg(LOG_ERR, __func__,
415		    "interface %s was already configured", ifname);
416		free(sdl);
417		return (-1);
418	}
419
420	if (Fflag) {
421		struct in6_ndireq nd;
422		int s;
423
424		if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
425			warnmsg(LOG_ERR, __func__, "socket() failed.");
426			return (-1);
427		}
428		memset(&nd, 0, sizeof(nd));
429		strlcpy(nd.ifname, ifname, sizeof(nd.ifname));
430		if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
431			warnmsg(LOG_ERR, __func__,
432			    "cannot get accept_rtadv flag");
433			close(s);
434			return (-1);
435		}
436		nd.ndi.flags |= ND6_IFF_ACCEPT_RTADV;
437		if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd) < 0) {
438			warnmsg(LOG_ERR, __func__,
439			    "cannot set accept_rtadv flag");
440			close(s);
441			return (-1);
442		}
443		close(s);
444	}
445
446	if ((ifi = malloc(sizeof(*ifi))) == NULL) {
447		warnmsg(LOG_ERR, __func__, "memory allocation failed");
448		free(sdl);
449		return (-1);
450	}
451	memset(ifi, 0, sizeof(*ifi));
452	ifi->sdl = sdl;
453	ifi->ifi_rdnss = IFI_DNSOPT_STATE_NOINFO;
454	ifi->ifi_dnssl = IFI_DNSOPT_STATE_NOINFO;
455	TAILQ_INIT(&ifi->ifi_rainfo);
456	strlcpy(ifi->ifname, ifname, sizeof(ifi->ifname));
457
458	/* construct a router solicitation message */
459	if (make_packet(ifi))
460		goto bad;
461
462	/* set link ID of this interface. */
463#ifdef HAVE_SCOPELIB
464	if (inet_zoneid(AF_INET6, 2, ifname, &ifi->linkid))
465		goto bad;
466#else
467	/* XXX: assume interface IDs as link IDs */
468	ifi->linkid = ifi->sdl->sdl_index;
469#endif
470
471	/*
472	 * check if the interface is available.
473	 * also check if SIOCGIFMEDIA ioctl is OK on the interface.
474	 */
475	ifi->mediareqok = 1;
476	ifi->active = interface_status(ifi);
477	if (!ifi->mediareqok) {
478		/*
479		 * probe routers periodically even if the link status
480		 * does not change.
481		 */
482		ifi->probeinterval = PROBE_INTERVAL;
483	}
484
485	/* activate interface: interface_up returns 0 on success */
486	flags = interface_up(ifi->ifname);
487	if (flags == 0)
488		ifi->state = IFS_DELAY;
489	else if (flags == IFS_TENTATIVE)
490		ifi->state = IFS_TENTATIVE;
491	else
492		ifi->state = IFS_DOWN;
493
494	rtsol_timer_update(ifi);
495
496	TAILQ_INSERT_TAIL(&ifinfo_head, ifi, ifi_next);
497	return (0);
498
499bad:
500	free(ifi->sdl);
501	free(ifi);
502	return (-1);
503}
504
505void
506iflist_init(void)
507{
508	struct ifinfo *ifi;
509
510	while ((ifi = TAILQ_FIRST(&ifinfo_head)) != NULL) {
511		TAILQ_REMOVE(&ifinfo_head, ifi, ifi_next);
512		if (ifi->sdl != NULL)
513			free(ifi->sdl);
514		if (ifi->rs_data != NULL)
515			free(ifi->rs_data);
516		free(ifi);
517	}
518}
519
520#if 0
521static int
522ifreconfig(char *ifname)
523{
524	struct ifinfo *ifi, *prev;
525	int rv;
526
527	prev = NULL;
528	TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
529		if (strncmp(ifi->ifname, ifname, sizeof(ifi->ifname)) == 0)
530			break;
531		prev = ifi;
532	}
533	prev->next = ifi->next;
534
535	rv = ifconfig(ifname);
536
537	/* reclaim it after ifconfig() in case ifname is pointer inside ifi */
538	if (ifi->rs_data)
539		free(ifi->rs_data);
540	free(ifi->sdl);
541	free(ifi);
542
543	return (rv);
544}
545#endif
546
547struct rainfo *
548find_rainfo(struct ifinfo *ifi, struct sockaddr_in6 *sin6)
549{
550	struct rainfo *rai;
551
552	TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next)
553		if (memcmp(&rai->rai_saddr.sin6_addr, &sin6->sin6_addr,
554		    sizeof(rai->rai_saddr.sin6_addr)) == 0)
555			return (rai);
556
557	return (NULL);
558}
559
560struct ifinfo *
561find_ifinfo(int ifindex)
562{
563	struct ifinfo *ifi;
564
565	TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
566		if (ifi->sdl->sdl_index == ifindex)
567			return (ifi);
568	}
569	return (NULL);
570}
571
572static int
573make_packet(struct ifinfo *ifi)
574{
575	size_t packlen = sizeof(struct nd_router_solicit), lladdroptlen = 0;
576	struct nd_router_solicit *rs;
577	char *buf;
578
579	if ((lladdroptlen = lladdropt_length(ifi->sdl)) == 0) {
580		warnmsg(LOG_INFO, __func__,
581		    "link-layer address option has null length"
582		    " on %s. Treat as not included.", ifi->ifname);
583	}
584	packlen += lladdroptlen;
585	ifi->rs_datalen = packlen;
586
587	/* allocate buffer */
588	if ((buf = malloc(packlen)) == NULL) {
589		warnmsg(LOG_ERR, __func__,
590		    "memory allocation failed for %s", ifi->ifname);
591		return (-1);
592	}
593	ifi->rs_data = buf;
594
595	/* fill in the message */
596	rs = (struct nd_router_solicit *)buf;
597	rs->nd_rs_type = ND_ROUTER_SOLICIT;
598	rs->nd_rs_code = 0;
599	rs->nd_rs_cksum = 0;
600	rs->nd_rs_reserved = 0;
601	buf += sizeof(*rs);
602
603	/* fill in source link-layer address option */
604	if (lladdroptlen)
605		lladdropt_fill(ifi->sdl, (struct nd_opt_hdr *)buf);
606
607	return (0);
608}
609
610static struct timespec *
611rtsol_check_timer(void)
612{
613	static struct timespec returnval;
614	struct timespec now, rtsol_timer;
615	struct ifinfo *ifi;
616	struct rainfo *rai;
617	struct ra_opt *rao;
618	int flags;
619
620	clock_gettime(CLOCK_MONOTONIC_FAST, &now);
621
622	rtsol_timer = tm_max;
623
624	TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) {
625		if (TS_CMP(&ifi->expire, &now, <=)) {
626			warnmsg(LOG_DEBUG, __func__, "timer expiration on %s, "
627			    "state = %d", ifi->ifname, ifi->state);
628
629			while((rai = TAILQ_FIRST(&ifi->ifi_rainfo)) != NULL) {
630				/* Remove all RA options. */
631				TAILQ_REMOVE(&ifi->ifi_rainfo, rai, rai_next);
632				while ((rao = TAILQ_FIRST(&rai->rai_ra_opt)) !=
633				    NULL) {
634					TAILQ_REMOVE(&rai->rai_ra_opt, rao,
635					    rao_next);
636					if (rao->rao_msg != NULL)
637						free(rao->rao_msg);
638					free(rao);
639				}
640				free(rai);
641			}
642			switch (ifi->state) {
643			case IFS_DOWN:
644			case IFS_TENTATIVE:
645				/* interface_up returns 0 on success */
646				flags = interface_up(ifi->ifname);
647				if (flags == 0)
648					ifi->state = IFS_DELAY;
649				else if (flags == IFS_TENTATIVE)
650					ifi->state = IFS_TENTATIVE;
651				else
652					ifi->state = IFS_DOWN;
653				break;
654			case IFS_IDLE:
655			{
656				int oldstatus = ifi->active;
657				int probe = 0;
658
659				ifi->active = interface_status(ifi);
660
661				if (oldstatus != ifi->active) {
662					warnmsg(LOG_DEBUG, __func__,
663					    "%s status is changed"
664					    " from %d to %d",
665					    ifi->ifname,
666					    oldstatus, ifi->active);
667					probe = 1;
668					ifi->state = IFS_DELAY;
669				} else if (ifi->probeinterval &&
670				    (ifi->probetimer -=
671				    ifi->timer.tv_sec) <= 0) {
672					/* probe timer expired */
673					ifi->probetimer =
674					    ifi->probeinterval;
675					probe = 1;
676					ifi->state = IFS_PROBE;
677				}
678
679				/*
680				 * If we need a probe, clear the previous
681				 * status wrt the "other" configuration.
682				 */
683				if (probe)
684					ifi->otherconfig = 0;
685
686				if (probe && mobile_node)
687					defrouter_probe(ifi);
688				break;
689			}
690			case IFS_DELAY:
691				ifi->state = IFS_PROBE;
692				sendpacket(ifi);
693				break;
694			case IFS_PROBE:
695				if (ifi->probes < MAX_RTR_SOLICITATIONS)
696					sendpacket(ifi);
697				else {
698					warnmsg(LOG_INFO, __func__,
699					    "No answer after sending %d RSs",
700					    ifi->probes);
701					ifi->probes = 0;
702					ifi->state = IFS_IDLE;
703				}
704				break;
705			}
706			rtsol_timer_update(ifi);
707		} else {
708			/* Expiration check for RA options. */
709			int expire = 0;
710
711			TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next) {
712				TAILQ_FOREACH(rao, &rai->rai_ra_opt, rao_next) {
713					warnmsg(LOG_DEBUG, __func__,
714					    "RA expiration timer: "
715					    "type=%d, msg=%s, expire=%s",
716					    rao->rao_type, (char *)rao->rao_msg,
717						sec2str(&rao->rao_expire));
718					if (TS_CMP(&now, &rao->rao_expire,
719					    >=)) {
720						warnmsg(LOG_DEBUG, __func__,
721						    "RA expiration timer: "
722						    "expired.");
723						TAILQ_REMOVE(&rai->rai_ra_opt,
724						    rao, rao_next);
725						if (rao->rao_msg != NULL)
726							free(rao->rao_msg);
727						free(rao);
728						expire = 1;
729					}
730				}
731			}
732			if (expire)
733				ra_opt_handler(ifi);
734		}
735		if (TS_CMP(&ifi->expire, &rtsol_timer, <))
736			rtsol_timer = ifi->expire;
737	}
738
739	if (TS_CMP(&rtsol_timer, &tm_max, ==)) {
740		warnmsg(LOG_DEBUG, __func__, "there is no timer");
741		return (NULL);
742	} else if (TS_CMP(&rtsol_timer, &now, <))
743		/* this may occur when the interval is too small */
744		returnval.tv_sec = returnval.tv_nsec = 0;
745	else
746		TS_SUB(&rtsol_timer, &now, &returnval);
747
748	now.tv_sec += returnval.tv_sec;
749	now.tv_nsec += returnval.tv_nsec;
750	warnmsg(LOG_DEBUG, __func__, "New timer is %s",
751	    sec2str(&now));
752
753	return (&returnval);
754}
755
756void
757rtsol_timer_update(struct ifinfo *ifi)
758{
759#define MILLION 1000000
760#define DADRETRY 10		/* XXX: adhoc */
761	long interval;
762	struct timespec now;
763
764	bzero(&ifi->timer, sizeof(ifi->timer));
765
766	switch (ifi->state) {
767	case IFS_DOWN:
768	case IFS_TENTATIVE:
769		if (++ifi->dadcount > DADRETRY) {
770			ifi->dadcount = 0;
771			ifi->timer.tv_sec = PROBE_INTERVAL;
772		} else
773			ifi->timer.tv_sec = 1;
774		break;
775	case IFS_IDLE:
776		if (mobile_node) {
777			/* XXX should be configurable */
778			ifi->timer.tv_sec = 3;
779		}
780		else
781			ifi->timer = tm_max;	/* stop timer(valid?) */
782		break;
783	case IFS_DELAY:
784#ifndef HAVE_ARC4RANDOM
785		interval = random() % (MAX_RTR_SOLICITATION_DELAY * MILLION);
786#else
787		interval = arc4random_uniform(MAX_RTR_SOLICITATION_DELAY * MILLION);
788#endif
789		ifi->timer.tv_sec = interval / MILLION;
790		ifi->timer.tv_nsec = (interval % MILLION) * 1000;
791		break;
792	case IFS_PROBE:
793		if (ifi->probes < MAX_RTR_SOLICITATIONS)
794			ifi->timer.tv_sec = RTR_SOLICITATION_INTERVAL;
795		else {
796			/*
797			 * After sending MAX_RTR_SOLICITATIONS solicitations,
798			 * we're just waiting for possible replies; there
799			 * will be no more solicitation.  Thus, we change
800			 * the timer value to MAX_RTR_SOLICITATION_DELAY based
801			 * on RFC 2461, Section 6.3.7.
802			 */
803			ifi->timer.tv_sec = MAX_RTR_SOLICITATION_DELAY;
804		}
805		break;
806	default:
807		warnmsg(LOG_ERR, __func__,
808		    "illegal interface state(%d) on %s",
809		    ifi->state, ifi->ifname);
810		return;
811	}
812
813	/* reset the timer */
814	if (TS_CMP(&ifi->timer, &tm_max, ==)) {
815		ifi->expire = tm_max;
816		warnmsg(LOG_DEBUG, __func__,
817		    "stop timer for %s", ifi->ifname);
818	} else {
819		clock_gettime(CLOCK_MONOTONIC_FAST, &now);
820		TS_ADD(&now, &ifi->timer, &ifi->expire);
821
822		now.tv_sec += ifi->timer.tv_sec;
823		now.tv_nsec += ifi->timer.tv_nsec;
824		warnmsg(LOG_DEBUG, __func__, "set timer for %s to %s",
825		    ifi->ifname, sec2str(&now));
826	}
827
828#undef MILLION
829}
830
831/* timer related utility functions */
832#define MILLION 1000000
833
834#ifndef SMALL
835static void
836rtsold_set_dump_file(int sig __unused)
837{
838	do_dump = 1;
839}
840#endif
841
842static void
843usage(void)
844{
845#ifndef SMALL
846	fprintf(stderr, "usage: rtsold [-adDfFm1] [-O script-name] "
847	    "[-P pidfile] [-R script-name] interfaces...\n");
848	fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] "
849	    "[-P pidfile] [-R script-name] -a\n");
850#else
851	fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
852	    "[-P pidfile] [-R script-name] interfaces...\n");
853	fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] "
854	    "[-P pidfile] [-R script-name] -a\n");
855#endif
856}
857
858void
859warnmsg(int priority, const char *func, const char *msg, ...)
860{
861	va_list ap;
862	char buf[BUFSIZ];
863
864	va_start(ap, msg);
865	if (fflag) {
866		if (priority <= log_upto) {
867			(void)vfprintf(stderr, msg, ap);
868			(void)fprintf(stderr, "\n");
869		}
870	} else {
871		snprintf(buf, sizeof(buf), "<%s> %s", func, msg);
872		msg = buf;
873		vsyslog(priority, msg, ap);
874	}
875	va_end(ap);
876}
877
878/*
879 * return a list of interfaces which is suitable to sending an RS.
880 */
881char **
882autoifprobe(void)
883{
884	static char **argv = NULL;
885	static int n = 0;
886	char **a;
887	int s = 0, i, found;
888	struct ifaddrs *ifap, *ifa;
889	struct in6_ndireq nd;
890
891	/* initialize */
892	while (n--)
893		free(argv[n]);
894	if (argv) {
895		free(argv);
896		argv = NULL;
897	}
898	n = 0;
899
900	if (getifaddrs(&ifap) != 0)
901		return (NULL);
902
903	if (!Fflag && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
904		warnmsg(LOG_ERR, __func__, "socket");
905		exit(1);
906	}
907
908	/* find an ethernet */
909	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
910		if ((ifa->ifa_flags & IFF_UP) == 0)
911			continue;
912		if ((ifa->ifa_flags & IFF_POINTOPOINT) != 0)
913			continue;
914		if ((ifa->ifa_flags & IFF_LOOPBACK) != 0)
915			continue;
916		if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
917			continue;
918
919		if (ifa->ifa_addr->sa_family != AF_INET6)
920			continue;
921
922		found = 0;
923		for (i = 0; i < n; i++) {
924			if (strcmp(argv[i], ifa->ifa_name) == 0) {
925				found++;
926				break;
927			}
928		}
929		if (found)
930			continue;
931
932		/*
933		 * Skip the interfaces which IPv6 and/or accepting RA
934		 * is disabled.
935		 */
936		if (!Fflag) {
937			memset(&nd, 0, sizeof(nd));
938			strlcpy(nd.ifname, ifa->ifa_name, sizeof(nd.ifname));
939			if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
940				warnmsg(LOG_ERR, __func__,
941					"ioctl(SIOCGIFINFO_IN6)");
942				exit(1);
943			}
944			if ((nd.ndi.flags & ND6_IFF_IFDISABLED))
945				continue;
946			if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV))
947				continue;
948		}
949
950		/* if we find multiple candidates, just warn. */
951		if (n != 0 && dflag > 1)
952			warnmsg(LOG_WARNING, __func__,
953				"multiple interfaces found");
954
955		a = (char **)realloc(argv, (n + 1) * sizeof(char **));
956		if (a == NULL) {
957			warnmsg(LOG_ERR, __func__, "realloc");
958			exit(1);
959		}
960		argv = a;
961		argv[n] = strdup(ifa->ifa_name);
962		if (!argv[n]) {
963			warnmsg(LOG_ERR, __func__, "malloc");
964			exit(1);
965		}
966		n++;
967	}
968
969	if (n) {
970		a = (char **)realloc(argv, (n + 1) * sizeof(char **));
971		if (a == NULL) {
972			warnmsg(LOG_ERR, __func__, "realloc");
973			exit(1);
974		}
975		argv = a;
976		argv[n] = NULL;
977
978		if (dflag > 0) {
979			for (i = 0; i < n; i++)
980				warnmsg(LOG_WARNING, __func__, "probing %s",
981					argv[i]);
982		}
983	}
984	if (!Fflag)
985		close(s);
986	freeifaddrs(ifap);
987	return (argv);
988}
989