usr.sbin/rtsold/rtsold.c

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