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