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/time.h> 37 #include <sys/socket.h> 38 #include <sys/param.h> 39 40 #include <net/if.h> 41 #include <net/if_dl.h> 42 #include <net/if_var.h> 43 44 #include <netinet/in.h> 45 #include <netinet/icmp6.h> 46 #include <netinet/in_var.h> 47 #include <arpa/inet.h> 48 49 #include <netinet6/nd6.h> 50 51 #include <signal.h> 52 #include <unistd.h> 53 #include <syslog.h> 54 #include <string.h> 55 #include <stdlib.h> 56 #include <stdio.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 ifinfo *iflist; 71 struct timeval tm_max = {0x7fffffff, 0x7fffffff}; 72 static int log_upto = 999; 73 static int fflag = 0; 74 75 int Fflag = 0; /* force setting sysctl parameters */ 76 int aflag = 0; 77 int dflag = 0; 78 int uflag = 0; 79 80 const char *otherconf_script; 81 const 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 */ 95 static int mobile_node = 0; 96 static const char *pidfilename = RTSOL_PIDFILE; 97 98 #ifndef SMALL 99 static int do_dump; 100 static const char *dumpfilename = RTSOL_DUMPFILE; 101 #endif 102 103 #if 0 104 static int ifreconfig(char *); 105 #endif 106 107 static int make_packet(struct ifinfo *); 108 static struct timeval *rtsol_check_timer(void); 109 110 #ifndef SMALL 111 static void rtsold_set_dump_file(int); 112 #endif 113 static void usage(void); 114 115 int 116 main(int argc, char **argv) 117 { 118 int s, ch, once = 0; 119 struct timeval *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 /* set log level */ 191 if (dflag > 1) 192 log_upto = LOG_DEBUG; 193 else if (dflag > 0) 194 log_upto = LOG_INFO; 195 else 196 log_upto = LOG_NOTICE; 197 198 if (!fflag) { 199 char *ident; 200 201 ident = strrchr(argv0, '/'); 202 if (!ident) 203 ident = argv0; 204 else 205 ident++; 206 openlog(ident, LOG_NDELAY|LOG_PID, LOG_DAEMON); 207 if (log_upto >= 0) 208 setlogmask(LOG_UPTO(log_upto)); 209 } 210 211 if (otherconf_script && *otherconf_script != '/') { 212 errx(1, "configuration script (%s) must be an absolute path", 213 otherconf_script); 214 } 215 if (resolvconf_script && *resolvconf_script != '/') { 216 errx(1, "configuration script (%s) must be an absolute path", 217 resolvconf_script); 218 } 219 if (pidfilename && *pidfilename != '/') { 220 errx(1, "pid filename (%s) must be an absolute path", 221 pidfilename); 222 } 223 #ifndef HAVE_ARC4RANDOM 224 /* random value initialization */ 225 srandom((u_long)time(NULL)); 226 #endif 227 228 #if (__FreeBSD_version < 900000) 229 if (Fflag) { 230 setinet6sysctl(IPV6CTL_FORWARDING, 0); 231 } else { 232 /* warn if forwarding is up */ 233 if (getinet6sysctl(IPV6CTL_FORWARDING)) 234 warnx("kernel is configured as a router, not a host"); 235 } 236 #endif 237 238 #ifndef SMALL 239 /* initialization to dump internal status to a file */ 240 signal(SIGUSR1, rtsold_set_dump_file); 241 #endif 242 243 if (!fflag) 244 daemon(0, 0); /* act as a daemon */ 245 246 /* 247 * Open a socket for sending RS and receiving RA. 248 * This should be done before calling ifinit(), since the function 249 * uses the socket. 250 */ 251 if ((s = sockopen()) < 0) { 252 warnmsg(LOG_ERR, __func__, "failed to open a socket"); 253 exit(1); 254 } 255 #ifdef HAVE_POLL_H 256 set[0].fd = s; 257 set[0].events = POLLIN; 258 #else 259 maxfd = s; 260 #endif 261 262 #ifdef HAVE_POLL_H 263 set[1].fd = -1; 264 #endif 265 266 if ((rtsock = rtsock_open()) < 0) { 267 warnmsg(LOG_ERR, __func__, "failed to open a socket"); 268 exit(1); 269 } 270 #ifdef HAVE_POLL_H 271 set[1].fd = rtsock; 272 set[1].events = POLLIN; 273 #else 274 if (rtsock > maxfd) 275 maxfd = rtsock; 276 #endif 277 278 #ifndef HAVE_POLL_H 279 fdmasks = howmany(maxfd + 1, NFDBITS) * sizeof(fd_mask); 280 if ((fdsetp = malloc(fdmasks)) == NULL) { 281 warnmsg(LOG_ERR, __func__, "malloc"); 282 exit(1); 283 } 284 if ((selectfdp = malloc(fdmasks)) == NULL) { 285 warnmsg(LOG_ERR, __func__, "malloc"); 286 exit(1); 287 } 288 #endif 289 290 /* configuration per interface */ 291 if (ifinit()) { 292 warnmsg(LOG_ERR, __func__, 293 "failed to initialize interfaces"); 294 exit(1); 295 } 296 if (aflag) 297 argv = autoifprobe(); 298 while (argv && *argv) { 299 if (ifconfig(*argv)) { 300 warnmsg(LOG_ERR, __func__, 301 "failed to initialize %s", *argv); 302 exit(1); 303 } 304 argv++; 305 } 306 307 /* setup for probing default routers */ 308 if (probe_init()) { 309 warnmsg(LOG_ERR, __func__, 310 "failed to setup for probing routers"); 311 exit(1); 312 /*NOTREACHED*/ 313 } 314 315 /* dump the current pid */ 316 if (!once) { 317 pid_t pid = getpid(); 318 FILE *fp; 319 320 if ((fp = fopen(pidfilename, "w")) == NULL) 321 warnmsg(LOG_ERR, __func__, 322 "failed to open a pid log file(%s): %s", 323 pidfilename, strerror(errno)); 324 else { 325 fprintf(fp, "%d\n", pid); 326 fclose(fp); 327 } 328 } 329 #ifndef HAVE_POLL_H 330 memset(fdsetp, 0, fdmasks); 331 FD_SET(s, fdsetp); 332 FD_SET(rtsock, fdsetp); 333 #endif 334 while (1) { /* main loop */ 335 int e; 336 337 #ifndef HAVE_POLL_H 338 memcpy(selectfdp, fdsetp, fdmasks); 339 #endif 340 341 #ifndef SMALL 342 if (do_dump) { /* SIGUSR1 */ 343 do_dump = 0; 344 rtsold_dump_file(dumpfilename); 345 } 346 #endif 347 348 timeout = rtsol_check_timer(); 349 350 if (once) { 351 struct ifinfo *ifi; 352 353 /* if we have no timeout, we are done (or failed) */ 354 if (timeout == NULL) 355 break; 356 357 /* if all interfaces have got RA packet, we are done */ 358 TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) { 359 if (ifi->state != IFS_DOWN && ifi->racnt == 0) 360 break; 361 } 362 if (ifi == NULL) 363 break; 364 } 365 #ifdef HAVE_POLL_H 366 e = poll(set, 2, timeout ? (timeout->tv_sec * 1000 + timeout->tv_usec / 1000) : INFTIM); 367 #else 368 e = select(maxfd + 1, selectfdp, NULL, NULL, timeout); 369 #endif 370 if (e < 1) { 371 if (e < 0 && errno != EINTR) { 372 warnmsg(LOG_ERR, __func__, "select: %s", 373 strerror(errno)); 374 } 375 continue; 376 } 377 378 /* packet reception */ 379 #ifdef HAVE_POLL_H 380 if (set[1].revents & POLLIN) 381 #else 382 if (FD_ISSET(rtsock, selectfdp)) 383 #endif 384 rtsock_input(rtsock); 385 #ifdef HAVE_POLL_H 386 if (set[0].revents & POLLIN) 387 #else 388 if (FD_ISSET(s, selectfdp)) 389 #endif 390 rtsol_input(s); 391 } 392 /* NOTREACHED */ 393 394 return (0); 395 } 396 397 int 398 ifconfig(char *ifname) 399 { 400 struct ifinfo *ifi; 401 struct sockaddr_dl *sdl; 402 int flags; 403 404 if ((sdl = if_nametosdl(ifname)) == NULL) { 405 warnmsg(LOG_ERR, __func__, 406 "failed to get link layer information for %s", ifname); 407 return (-1); 408 } 409 if (find_ifinfo(sdl->sdl_index)) { 410 warnmsg(LOG_ERR, __func__, 411 "interface %s was already configured", ifname); 412 free(sdl); 413 return (-1); 414 } 415 416 if (Fflag) { 417 struct in6_ndireq nd; 418 int s; 419 420 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 421 warnmsg(LOG_ERR, __func__, "socket() failed."); 422 return (-1); 423 } 424 memset(&nd, 0, sizeof(nd)); 425 strlcpy(nd.ifname, ifname, sizeof(nd.ifname)); 426 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) { 427 warnmsg(LOG_ERR, __func__, 428 "cannot get accept_rtadv flag"); 429 close(s); 430 return (-1); 431 } 432 nd.ndi.flags |= ND6_IFF_ACCEPT_RTADV; 433 if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd) < 0) { 434 warnmsg(LOG_ERR, __func__, 435 "cannot set accept_rtadv flag"); 436 close(s); 437 return (-1); 438 } 439 close(s); 440 } 441 442 if ((ifi = malloc(sizeof(*ifi))) == NULL) { 443 warnmsg(LOG_ERR, __func__, "memory allocation failed"); 444 free(sdl); 445 return (-1); 446 } 447 memset(ifi, 0, sizeof(*ifi)); 448 ifi->sdl = sdl; 449 ifi->ifi_rdnss = IFI_DNSOPT_STATE_NOINFO; 450 ifi->ifi_dnssl = IFI_DNSOPT_STATE_NOINFO; 451 TAILQ_INIT(&ifi->ifi_rainfo); 452 strlcpy(ifi->ifname, ifname, sizeof(ifi->ifname)); 453 454 /* construct a router solicitation message */ 455 if (make_packet(ifi)) 456 goto bad; 457 458 /* set link ID of this interface. */ 459 #ifdef HAVE_SCOPELIB 460 if (inet_zoneid(AF_INET6, 2, ifname, &ifi->linkid)) 461 goto bad; 462 #else 463 /* XXX: assume interface IDs as link IDs */ 464 ifi->linkid = ifi->sdl->sdl_index; 465 #endif 466 467 /* 468 * check if the interface is available. 469 * also check if SIOCGIFMEDIA ioctl is OK on the interface. 470 */ 471 ifi->mediareqok = 1; 472 ifi->active = interface_status(ifi); 473 if (!ifi->mediareqok) { 474 /* 475 * probe routers periodically even if the link status 476 * does not change. 477 */ 478 ifi->probeinterval = PROBE_INTERVAL; 479 } 480 481 /* activate interface: interface_up returns 0 on success */ 482 flags = interface_up(ifi->ifname); 483 if (flags == 0) 484 ifi->state = IFS_DELAY; 485 else if (flags == IFS_TENTATIVE) 486 ifi->state = IFS_TENTATIVE; 487 else 488 ifi->state = IFS_DOWN; 489 490 rtsol_timer_update(ifi); 491 492 TAILQ_INSERT_TAIL(&ifinfo_head, ifi, ifi_next); 493 return (0); 494 495 bad: 496 free(ifi->sdl); 497 free(ifi); 498 return (-1); 499 } 500 501 void 502 iflist_init(void) 503 { 504 struct ifinfo *ifi; 505 506 while ((ifi = TAILQ_FIRST(&ifinfo_head)) != NULL) { 507 TAILQ_REMOVE(&ifinfo_head, ifi, ifi_next); 508 if (ifi->sdl != NULL) 509 free(ifi->sdl); 510 if (ifi->rs_data != NULL) 511 free(ifi->rs_data); 512 free(ifi); 513 } 514 } 515 516 #if 0 517 static int 518 ifreconfig(char *ifname) 519 { 520 struct ifinfo *ifi, *prev; 521 int rv; 522 523 prev = NULL; 524 TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) { 525 if (strncmp(ifi->ifname, ifname, sizeof(ifi->ifname)) == 0) 526 break; 527 prev = ifi; 528 } 529 prev->next = ifi->next; 530 531 rv = ifconfig(ifname); 532 533 /* reclaim it after ifconfig() in case ifname is pointer inside ifi */ 534 if (ifi->rs_data) 535 free(ifi->rs_data); 536 free(ifi->sdl); 537 free(ifi); 538 539 return (rv); 540 } 541 #endif 542 543 struct rainfo * 544 find_rainfo(struct ifinfo *ifi, struct sockaddr_in6 *sin6) 545 { 546 struct rainfo *rai; 547 548 TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next) 549 if (memcmp(&rai->rai_saddr.sin6_addr, &sin6->sin6_addr, 550 sizeof(rai->rai_saddr.sin6_addr)) == 0) 551 return (rai); 552 553 return (NULL); 554 } 555 556 struct ifinfo * 557 find_ifinfo(int ifindex) 558 { 559 struct ifinfo *ifi; 560 561 TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) { 562 if (ifi->sdl->sdl_index == ifindex) 563 return (ifi); 564 } 565 return (NULL); 566 } 567 568 static int 569 make_packet(struct ifinfo *ifi) 570 { 571 size_t packlen = sizeof(struct nd_router_solicit), lladdroptlen = 0; 572 struct nd_router_solicit *rs; 573 char *buf; 574 575 if ((lladdroptlen = lladdropt_length(ifi->sdl)) == 0) { 576 warnmsg(LOG_INFO, __func__, 577 "link-layer address option has null length" 578 " on %s. Treat as not included.", ifi->ifname); 579 } 580 packlen += lladdroptlen; 581 ifi->rs_datalen = packlen; 582 583 /* allocate buffer */ 584 if ((buf = malloc(packlen)) == NULL) { 585 warnmsg(LOG_ERR, __func__, 586 "memory allocation failed for %s", ifi->ifname); 587 return (-1); 588 } 589 ifi->rs_data = buf; 590 591 /* fill in the message */ 592 rs = (struct nd_router_solicit *)buf; 593 rs->nd_rs_type = ND_ROUTER_SOLICIT; 594 rs->nd_rs_code = 0; 595 rs->nd_rs_cksum = 0; 596 rs->nd_rs_reserved = 0; 597 buf += sizeof(*rs); 598 599 /* fill in source link-layer address option */ 600 if (lladdroptlen) 601 lladdropt_fill(ifi->sdl, (struct nd_opt_hdr *)buf); 602 603 return (0); 604 } 605 606 static struct timeval * 607 rtsol_check_timer(void) 608 { 609 static struct timeval returnval; 610 struct timeval now, rtsol_timer; 611 struct ifinfo *ifi; 612 struct rainfo *rai; 613 struct ra_opt *rao; 614 int flags; 615 616 gettimeofday(&now, NULL); 617 618 rtsol_timer = tm_max; 619 620 TAILQ_FOREACH(ifi, &ifinfo_head, ifi_next) { 621 if (timercmp(&ifi->expire, &now, <=)) { 622 warnmsg(LOG_DEBUG, __func__, "timer expiration on %s, " 623 "state = %d", ifi->ifname, ifi->state); 624 625 while((rai = TAILQ_FIRST(&ifi->ifi_rainfo)) != NULL) { 626 /* Remove all RA options. */ 627 TAILQ_REMOVE(&ifi->ifi_rainfo, rai, rai_next); 628 while ((rao = TAILQ_FIRST(&rai->rai_ra_opt)) != 629 NULL) { 630 TAILQ_REMOVE(&rai->rai_ra_opt, rao, 631 rao_next); 632 if (rao->rao_msg != NULL) 633 free(rao->rao_msg); 634 free(rao); 635 } 636 free(rai); 637 } 638 switch (ifi->state) { 639 case IFS_DOWN: 640 case IFS_TENTATIVE: 641 /* interface_up returns 0 on success */ 642 flags = interface_up(ifi->ifname); 643 if (flags == 0) 644 ifi->state = IFS_DELAY; 645 else if (flags == IFS_TENTATIVE) 646 ifi->state = IFS_TENTATIVE; 647 else 648 ifi->state = IFS_DOWN; 649 break; 650 case IFS_IDLE: 651 { 652 int oldstatus = ifi->active; 653 int probe = 0; 654 655 ifi->active = interface_status(ifi); 656 657 if (oldstatus != ifi->active) { 658 warnmsg(LOG_DEBUG, __func__, 659 "%s status is changed" 660 " from %d to %d", 661 ifi->ifname, 662 oldstatus, ifi->active); 663 probe = 1; 664 ifi->state = IFS_DELAY; 665 } else if (ifi->probeinterval && 666 (ifi->probetimer -= 667 ifi->timer.tv_sec) <= 0) { 668 /* probe timer expired */ 669 ifi->probetimer = 670 ifi->probeinterval; 671 probe = 1; 672 ifi->state = IFS_PROBE; 673 } 674 675 /* 676 * If we need a probe, clear the previous 677 * status wrt the "other" configuration. 678 */ 679 if (probe) 680 ifi->otherconfig = 0; 681 682 if (probe && mobile_node) 683 defrouter_probe(ifi); 684 break; 685 } 686 case IFS_DELAY: 687 ifi->state = IFS_PROBE; 688 sendpacket(ifi); 689 break; 690 case IFS_PROBE: 691 if (ifi->probes < MAX_RTR_SOLICITATIONS) 692 sendpacket(ifi); 693 else { 694 warnmsg(LOG_INFO, __func__, 695 "No answer after sending %d RSs", 696 ifi->probes); 697 ifi->probes = 0; 698 ifi->state = IFS_IDLE; 699 } 700 break; 701 } 702 rtsol_timer_update(ifi); 703 } else { 704 /* Expiration check for RA options. */ 705 int expire = 0; 706 707 TAILQ_FOREACH(rai, &ifi->ifi_rainfo, rai_next) { 708 TAILQ_FOREACH(rao, &rai->rai_ra_opt, rao_next) { 709 warnmsg(LOG_DEBUG, __func__, 710 "RA expiration timer: " 711 "type=%d, msg=%s, expire=%s", 712 rao->rao_type, (char *)rao->rao_msg, 713 sec2str(&rao->rao_expire)); 714 if (timercmp(&now, &rao->rao_expire, 715 >=)) { 716 warnmsg(LOG_DEBUG, __func__, 717 "RA expiration timer: " 718 "expired."); 719 TAILQ_REMOVE(&rai->rai_ra_opt, 720 rao, rao_next); 721 if (rao->rao_msg != NULL) 722 free(rao->rao_msg); 723 free(rao); 724 expire = 1; 725 } 726 } 727 } 728 if (expire) 729 ra_opt_handler(ifi); 730 } 731 if (timercmp(&ifi->expire, &rtsol_timer, <)) 732 rtsol_timer = ifi->expire; 733 } 734 735 if (timercmp(&rtsol_timer, &tm_max, ==)) { 736 warnmsg(LOG_DEBUG, __func__, "there is no timer"); 737 return (NULL); 738 } else if (timercmp(&rtsol_timer, &now, <)) 739 /* this may occur when the interval is too small */ 740 returnval.tv_sec = returnval.tv_usec = 0; 741 else 742 timersub(&rtsol_timer, &now, &returnval); 743 744 now.tv_sec += returnval.tv_sec; 745 now.tv_usec += returnval.tv_usec; 746 warnmsg(LOG_DEBUG, __func__, "New timer is %s", 747 sec2str(&now)); 748 749 return (&returnval); 750 } 751 752 void 753 rtsol_timer_update(struct ifinfo *ifi) 754 { 755 #define MILLION 1000000 756 #define DADRETRY 10 /* XXX: adhoc */ 757 long interval; 758 struct timeval now; 759 760 bzero(&ifi->timer, sizeof(ifi->timer)); 761 762 switch (ifi->state) { 763 case IFS_DOWN: 764 case IFS_TENTATIVE: 765 if (++ifi->dadcount > DADRETRY) { 766 ifi->dadcount = 0; 767 ifi->timer.tv_sec = PROBE_INTERVAL; 768 } else 769 ifi->timer.tv_sec = 1; 770 break; 771 case IFS_IDLE: 772 if (mobile_node) { 773 /* XXX should be configurable */ 774 ifi->timer.tv_sec = 3; 775 } 776 else 777 ifi->timer = tm_max; /* stop timer(valid?) */ 778 break; 779 case IFS_DELAY: 780 #ifndef HAVE_ARC4RANDOM 781 interval = random() % (MAX_RTR_SOLICITATION_DELAY * MILLION); 782 #else 783 interval = arc4random_uniform(MAX_RTR_SOLICITATION_DELAY * MILLION); 784 #endif 785 ifi->timer.tv_sec = interval / MILLION; 786 ifi->timer.tv_usec = interval % MILLION; 787 break; 788 case IFS_PROBE: 789 if (ifi->probes < MAX_RTR_SOLICITATIONS) 790 ifi->timer.tv_sec = RTR_SOLICITATION_INTERVAL; 791 else { 792 /* 793 * After sending MAX_RTR_SOLICITATIONS solicitations, 794 * we're just waiting for possible replies; there 795 * will be no more solicitation. Thus, we change 796 * the timer value to MAX_RTR_SOLICITATION_DELAY based 797 * on RFC 2461, Section 6.3.7. 798 */ 799 ifi->timer.tv_sec = MAX_RTR_SOLICITATION_DELAY; 800 } 801 break; 802 default: 803 warnmsg(LOG_ERR, __func__, 804 "illegal interface state(%d) on %s", 805 ifi->state, ifi->ifname); 806 return; 807 } 808 809 /* reset the timer */ 810 if (timercmp(&ifi->timer, &tm_max, ==)) { 811 ifi->expire = tm_max; 812 warnmsg(LOG_DEBUG, __func__, 813 "stop timer for %s", ifi->ifname); 814 } else { 815 gettimeofday(&now, NULL); 816 timeradd(&now, &ifi->timer, &ifi->expire); 817 818 now.tv_sec += ifi->timer.tv_sec; 819 now.tv_usec += ifi->timer.tv_usec; 820 warnmsg(LOG_DEBUG, __func__, "set timer for %s to %s", 821 ifi->ifname, sec2str(&now)); 822 } 823 824 #undef MILLION 825 } 826 827 /* timer related utility functions */ 828 #define MILLION 1000000 829 830 #ifndef SMALL 831 static void 832 rtsold_set_dump_file(int sig __unused) 833 { 834 do_dump = 1; 835 } 836 #endif 837 838 static void 839 usage(void) 840 { 841 #ifndef SMALL 842 fprintf(stderr, "usage: rtsold [-adDfFm1] [-O script-name] " 843 "[-P pidfile] [-R script-name] interfaces...\n"); 844 fprintf(stderr, "usage: rtsold [-dDfFm1] [-O script-name] " 845 "[-P pidfile] [-R script-name] -a\n"); 846 #else 847 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] " 848 "[-P pidfile] [-R script-name] interfaces...\n"); 849 fprintf(stderr, "usage: rtsol [-dDF] [-O script-name] " 850 "[-P pidfile] [-R script-name] -a\n"); 851 #endif 852 } 853 854 void 855 warnmsg(int priority, const char *func, const char *msg, ...) 856 { 857 va_list ap; 858 char buf[BUFSIZ]; 859 860 va_start(ap, msg); 861 if (fflag) { 862 if (priority <= log_upto) { 863 (void)vfprintf(stderr, msg, ap); 864 (void)fprintf(stderr, "\n"); 865 } 866 } else { 867 snprintf(buf, sizeof(buf), "<%s> %s", func, msg); 868 msg = buf; 869 vsyslog(priority, msg, ap); 870 } 871 va_end(ap); 872 } 873 874 /* 875 * return a list of interfaces which is suitable to sending an RS. 876 */ 877 char ** 878 autoifprobe(void) 879 { 880 static char **argv = NULL; 881 static int n = 0; 882 char **a; 883 int s = 0, i, found; 884 struct ifaddrs *ifap, *ifa, *target; 885 struct in6_ndireq nd; 886 887 /* initialize */ 888 while (n--) 889 free(argv[n]); 890 if (argv) { 891 free(argv); 892 argv = NULL; 893 } 894 n = 0; 895 896 if (getifaddrs(&ifap) != 0) 897 return (NULL); 898 899 if (!Fflag && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 900 warnmsg(LOG_ERR, __func__, "socket"); 901 exit(1); 902 } 903 904 target = NULL; 905 /* find an ethernet */ 906 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 907 if ((ifa->ifa_flags & IFF_UP) == 0) 908 continue; 909 if ((ifa->ifa_flags & IFF_POINTOPOINT) != 0) 910 continue; 911 if ((ifa->ifa_flags & IFF_LOOPBACK) != 0) 912 continue; 913 if ((ifa->ifa_flags & IFF_MULTICAST) == 0) 914 continue; 915 916 if (ifa->ifa_addr->sa_family != AF_INET6) 917 continue; 918 919 found = 0; 920 for (i = 0; i < n; i++) { 921 if (strcmp(argv[i], ifa->ifa_name) == 0) { 922 found++; 923 break; 924 } 925 } 926 if (found) 927 continue; 928 929 /* 930 * Skip the interfaces which IPv6 and/or accepting RA 931 * is disabled. 932 */ 933 if (!Fflag) { 934 memset(&nd, 0, sizeof(nd)); 935 strlcpy(nd.ifname, ifa->ifa_name, sizeof(nd.ifname)); 936 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) { 937 warnmsg(LOG_ERR, __func__, 938 "ioctl(SIOCGIFINFO_IN6)"); 939 exit(1); 940 } 941 if ((nd.ndi.flags & ND6_IFF_IFDISABLED)) 942 continue; 943 if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV)) 944 continue; 945 } 946 947 /* if we find multiple candidates, just warn. */ 948 if (n != 0 && dflag > 1) 949 warnmsg(LOG_WARNING, __func__, 950 "multiple interfaces found"); 951 952 a = (char **)realloc(argv, (n + 1) * sizeof(char **)); 953 if (a == NULL) { 954 warnmsg(LOG_ERR, __func__, "realloc"); 955 exit(1); 956 } 957 argv = a; 958 argv[n] = strdup(ifa->ifa_name); 959 if (!argv[n]) { 960 warnmsg(LOG_ERR, __func__, "malloc"); 961 exit(1); 962 } 963 n++; 964 } 965 966 if (n) { 967 a = (char **)realloc(argv, (n + 1) * sizeof(char **)); 968 if (a == NULL) { 969 warnmsg(LOG_ERR, __func__, "realloc"); 970 exit(1); 971 } 972 argv = a; 973 argv[n] = NULL; 974 975 if (dflag > 0) { 976 for (i = 0; i < n; i++) 977 warnmsg(LOG_WARNING, __func__, "probing %s", 978 argv[i]); 979 } 980 } 981 if (!Fflag) 982 close(s); 983 freeifaddrs(ifap); 984 return (argv); 985 } 986