1 /* $KAME: rtadvd.c,v 1.82 2003/08/05 12:34:23 itojun Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * Copyright (C) 2011 Hiroki Sato <hrs@FreeBSD.org> 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the project nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/param.h> 36 #include <sys/ioctl.h> 37 #include <sys/socket.h> 38 #include <sys/uio.h> 39 #include <sys/queue.h> 40 #include <sys/stat.h> 41 #include <sys/sysctl.h> 42 43 #include <net/if.h> 44 #include <net/if_types.h> 45 #include <net/if_media.h> 46 #include <net/if_dl.h> 47 #include <net/route.h> 48 #include <netinet/in.h> 49 #include <netinet/ip6.h> 50 #include <netinet6/ip6_var.h> 51 #include <netinet/icmp6.h> 52 53 #include <arpa/inet.h> 54 55 #include <netinet/in_var.h> 56 #include <netinet6/nd6.h> 57 58 #include <time.h> 59 #include <unistd.h> 60 #include <stdio.h> 61 #include <err.h> 62 #include <errno.h> 63 #include <inttypes.h> 64 #include <libutil.h> 65 #include <netdb.h> 66 #include <signal.h> 67 #include <string.h> 68 #include <stdlib.h> 69 #include <syslog.h> 70 #include <poll.h> 71 72 #include "pathnames.h" 73 #include "rtadvd.h" 74 #include "if.h" 75 #include "rrenum.h" 76 #include "advcap.h" 77 #include "timer_subr.h" 78 #include "timer.h" 79 #include "config.h" 80 #include "control.h" 81 #include "control_server.h" 82 83 #define RTADV_TYPE2BITMASK(type) (0x1 << type) 84 85 struct msghdr rcvmhdr; 86 static char *rcvcmsgbuf; 87 static size_t rcvcmsgbuflen; 88 static char *sndcmsgbuf = NULL; 89 static size_t sndcmsgbuflen; 90 struct msghdr sndmhdr; 91 struct iovec rcviov[2]; 92 struct iovec sndiov[2]; 93 struct sockaddr_in6 rcvfrom; 94 static const char *pidfilename = _PATH_RTADVDPID; 95 const char *conffile = _PATH_RTADVDCONF; 96 static struct pidfh *pfh; 97 static int dflag, sflag; 98 static int wait_shutdown; 99 100 #define PFD_RAWSOCK 0 101 #define PFD_RTSOCK 1 102 #define PFD_CSOCK 2 103 #define PFD_MAX 3 104 105 struct railist_head_t railist = 106 TAILQ_HEAD_INITIALIZER(railist); 107 struct ifilist_head_t ifilist = 108 TAILQ_HEAD_INITIALIZER(ifilist); 109 110 struct nd_optlist { 111 TAILQ_ENTRY(nd_optlist) nol_next; 112 struct nd_opt_hdr *nol_opt; 113 }; 114 union nd_opt { 115 struct nd_opt_hdr *opt_array[9]; 116 struct { 117 struct nd_opt_hdr *zero; 118 struct nd_opt_hdr *src_lladdr; 119 struct nd_opt_hdr *tgt_lladdr; 120 struct nd_opt_prefix_info *pi; 121 struct nd_opt_rd_hdr *rh; 122 struct nd_opt_mtu *mtu; 123 TAILQ_HEAD(, nd_optlist) opt_list; 124 } nd_opt_each; 125 }; 126 #define opt_src_lladdr nd_opt_each.src_lladdr 127 #define opt_tgt_lladdr nd_opt_each.tgt_lladdr 128 #define opt_pi nd_opt_each.pi 129 #define opt_rh nd_opt_each.rh 130 #define opt_mtu nd_opt_each.mtu 131 #define opt_list nd_opt_each.opt_list 132 133 #define NDOPT_FLAG_SRCLINKADDR (1 << 0) 134 #define NDOPT_FLAG_TGTLINKADDR (1 << 1) 135 #define NDOPT_FLAG_PREFIXINFO (1 << 2) 136 #define NDOPT_FLAG_RDHDR (1 << 3) 137 #define NDOPT_FLAG_MTU (1 << 4) 138 #define NDOPT_FLAG_RDNSS (1 << 5) 139 #define NDOPT_FLAG_DNSSL (1 << 6) 140 #define NDOPT_FLAG_PREF64 (1 << 7) 141 142 static uint32_t ndopt_flags[] = { 143 [ND_OPT_SOURCE_LINKADDR] = NDOPT_FLAG_SRCLINKADDR, 144 [ND_OPT_TARGET_LINKADDR] = NDOPT_FLAG_TGTLINKADDR, 145 [ND_OPT_PREFIX_INFORMATION] = NDOPT_FLAG_PREFIXINFO, 146 [ND_OPT_REDIRECTED_HEADER] = NDOPT_FLAG_RDHDR, 147 [ND_OPT_MTU] = NDOPT_FLAG_MTU, 148 [ND_OPT_RDNSS] = NDOPT_FLAG_RDNSS, 149 [ND_OPT_DNSSL] = NDOPT_FLAG_DNSSL, 150 [ND_OPT_PREF64] = NDOPT_FLAG_PREF64, 151 }; 152 153 static void rtadvd_shutdown(void); 154 static void sock_open(struct sockinfo *); 155 static void rtsock_open(struct sockinfo *); 156 static void rtadvd_input(struct sockinfo *); 157 static void rs_input(int, struct nd_router_solicit *, 158 struct in6_pktinfo *, struct sockaddr_in6 *); 159 static void ra_input(int, struct nd_router_advert *, 160 struct in6_pktinfo *, struct sockaddr_in6 *); 161 static int prefix_check(struct nd_opt_prefix_info *, struct rainfo *, 162 struct sockaddr_in6 *); 163 static int nd6_options(struct nd_opt_hdr *, int, 164 union nd_opt *, uint32_t); 165 static void free_ndopts(union nd_opt *); 166 static void rtmsg_input(struct sockinfo *); 167 static void set_short_delay(struct ifinfo *); 168 static int check_accept_rtadv(int); 169 170 static void 171 usage(void) 172 { 173 174 fprintf(stderr, "usage: rtadvd [-dDfRs] " 175 "[-c configfile] [-C ctlsock] [-M ifname] [-p pidfile]\n"); 176 exit(1); 177 } 178 179 int 180 main(int argc, char *argv[]) 181 { 182 struct pollfd set[PFD_MAX]; 183 struct timespec *timeout; 184 int i, ch; 185 int fflag = 0, logopt; 186 int error; 187 pid_t pid, otherpid; 188 189 /* get command line options and arguments */ 190 while ((ch = getopt(argc, argv, "c:C:dDfhM:p:Rs")) != -1) { 191 switch (ch) { 192 case 'c': 193 conffile = optarg; 194 break; 195 case 'C': 196 ctrlsock.si_name = optarg; 197 break; 198 case 'd': 199 dflag++; 200 break; 201 case 'D': 202 dflag += 3; 203 break; 204 case 'f': 205 fflag = 1; 206 break; 207 case 'M': 208 mcastif = optarg; 209 break; 210 case 'R': 211 fprintf(stderr, "rtadvd: " 212 "the -R option is currently ignored.\n"); 213 /* accept_rr = 1; */ 214 /* run anyway... */ 215 break; 216 case 's': 217 sflag = 1; 218 break; 219 case 'p': 220 pidfilename = optarg; 221 break; 222 default: 223 usage(); 224 } 225 } 226 argc -= optind; 227 argv += optind; 228 229 logopt = LOG_NDELAY | LOG_PID; 230 if (fflag) 231 logopt |= LOG_PERROR; 232 openlog("rtadvd", logopt, LOG_DAEMON); 233 234 /* set log level */ 235 if (dflag > 2) 236 (void)setlogmask(LOG_UPTO(LOG_DEBUG)); 237 else if (dflag > 1) 238 (void)setlogmask(LOG_UPTO(LOG_INFO)); 239 else if (dflag > 0) 240 (void)setlogmask(LOG_UPTO(LOG_NOTICE)); 241 else 242 (void)setlogmask(LOG_UPTO(LOG_ERR)); 243 244 /* timer initialization */ 245 rtadvd_timer_init(); 246 247 pfh = pidfile_open(pidfilename, 0600, &otherpid); 248 if (pfh == NULL) { 249 if (errno == EEXIST) 250 errx(1, "%s already running, pid: %d", 251 getprogname(), otherpid); 252 syslog(LOG_ERR, 253 "failed to open the pid file %s, run anyway.", 254 pidfilename); 255 } 256 if (!fflag) 257 daemon(1, 0); 258 259 sock_open(&sock); 260 261 update_ifinfo(&ifilist, UPDATE_IFINFO_ALL); 262 for (i = 0; i < argc; i++) 263 update_persist_ifinfo(&ifilist, argv[i]); 264 265 csock_open(&ctrlsock, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH); 266 if (ctrlsock.si_fd == -1) { 267 syslog(LOG_ERR, "cannot open control socket: %s", 268 strerror(errno)); 269 exit(1); 270 } 271 272 /* record the current PID */ 273 pid = getpid(); 274 pidfile_write(pfh); 275 276 set[PFD_RAWSOCK].fd = sock.si_fd; 277 set[PFD_RAWSOCK].events = POLLIN; 278 if (sflag == 0) { 279 rtsock_open(&rtsock); 280 set[PFD_RTSOCK].fd = rtsock.si_fd; 281 set[PFD_RTSOCK].events = POLLIN; 282 } else 283 set[PFD_RTSOCK].fd = -1; 284 set[PFD_CSOCK].fd = ctrlsock.si_fd; 285 set[PFD_CSOCK].events = POLLIN; 286 signal(SIGTERM, set_do_shutdown); 287 signal(SIGINT, set_do_shutdown); 288 signal(SIGHUP, set_do_reload); 289 290 error = csock_listen(&ctrlsock); 291 if (error) { 292 syslog(LOG_ERR, "cannot listen control socket: %s", 293 strerror(errno)); 294 exit(1); 295 } 296 297 /* load configuration file */ 298 set_do_reload(0); 299 300 while (1) { 301 if (is_do_shutdown()) 302 rtadvd_shutdown(); 303 304 if (is_do_reload()) { 305 loadconfig_ifname(reload_ifname()); 306 if (reload_ifname() == NULL) 307 syslog(LOG_INFO, 308 "configuration file reloaded."); 309 else 310 syslog(LOG_INFO, 311 "configuration file for %s reloaded.", 312 reload_ifname()); 313 reset_do_reload(); 314 } 315 316 /* timeout handler update for active interfaces */ 317 rtadvd_update_timeout_handler(); 318 319 /* timer expiration check and reset the timer */ 320 timeout = rtadvd_check_timer(); 321 322 if (timeout != NULL) { 323 syslog(LOG_DEBUG, 324 "<%s> set timer to %ld:%ld. waiting for " 325 "inputs or timeout", __func__, 326 (long int)timeout->tv_sec, 327 (long int)timeout->tv_nsec / 1000); 328 } else { 329 syslog(LOG_DEBUG, 330 "<%s> there's no timer. waiting for inputs", 331 __func__); 332 } 333 if ((i = poll(set, nitems(set), 334 timeout ? (timeout->tv_sec * 1000 + 335 timeout->tv_nsec / 1000 / 1000) : INFTIM)) < 0) { 336 337 /* EINTR would occur if a signal was delivered */ 338 if (errno != EINTR) 339 syslog(LOG_ERR, "poll() failed: %s", 340 strerror(errno)); 341 continue; 342 } 343 if (i == 0) /* timeout */ 344 continue; 345 if (rtsock.si_fd != -1 && set[PFD_RTSOCK].revents & POLLIN) 346 rtmsg_input(&rtsock); 347 348 if (set[PFD_RAWSOCK].revents & POLLIN) 349 rtadvd_input(&sock); 350 351 if (set[PFD_CSOCK].revents & POLLIN) { 352 int fd; 353 354 fd = csock_accept(&ctrlsock); 355 if (fd == -1) 356 syslog(LOG_ERR, 357 "cannot accept() control socket: %s", 358 strerror(errno)); 359 else { 360 cm_handler_server(fd); 361 close(fd); 362 } 363 } 364 } 365 exit(0); /* NOTREACHED */ 366 } 367 368 static void 369 rtadvd_shutdown(void) 370 { 371 struct ifinfo *ifi; 372 struct rainfo *rai; 373 struct rdnss *rdn; 374 struct dnssl *dns; 375 376 if (wait_shutdown) { 377 syslog(LOG_INFO, 378 "waiting expiration of the all RA timers."); 379 380 TAILQ_FOREACH(ifi, &ifilist, ifi_next) { 381 /* 382 * Ignore !IFF_UP interfaces in waiting for shutdown. 383 */ 384 if (!(ifi->ifi_flags & IFF_UP) && 385 ifi->ifi_ra_timer != NULL) { 386 ifi->ifi_state = IFI_STATE_UNCONFIGURED; 387 rtadvd_remove_timer(ifi->ifi_ra_timer); 388 ifi->ifi_ra_timer = NULL; 389 syslog(LOG_DEBUG, "<%s> %s(idx=%d) is down. " 390 "Timer removed and marked as UNCONFIGURED.", 391 __func__, ifi->ifi_ifname, 392 ifi->ifi_ifindex); 393 } 394 } 395 TAILQ_FOREACH(ifi, &ifilist, ifi_next) { 396 if (ifi->ifi_ra_timer != NULL) 397 break; 398 } 399 if (ifi == NULL) { 400 syslog(LOG_NOTICE, "gracefully terminated."); 401 exit(0); 402 } 403 404 sleep(1); 405 return; 406 } 407 408 syslog(LOG_DEBUG, "<%s> cease to be an advertising router", 409 __func__); 410 411 wait_shutdown = 1; 412 413 TAILQ_FOREACH(rai, &railist, rai_next) { 414 rai->rai_lifetime = 0; 415 TAILQ_FOREACH(rdn, &rai->rai_rdnss, rd_next) 416 rdn->rd_ltime = 0; 417 TAILQ_FOREACH(dns, &rai->rai_dnssl, dn_next) 418 dns->dn_ltime = 0; 419 } 420 TAILQ_FOREACH(ifi, &ifilist, ifi_next) { 421 if (!ifi->ifi_persist) 422 continue; 423 if (ifi->ifi_state == IFI_STATE_UNCONFIGURED) 424 continue; 425 if (ifi->ifi_ra_timer == NULL) 426 continue; 427 if (ifi->ifi_ra_lastsent.tv_sec == 0 && 428 ifi->ifi_ra_lastsent.tv_nsec == 0 && 429 ifi->ifi_ra_timer != NULL) { 430 /* 431 * When RA configured but never sent, 432 * ignore the IF immediately. 433 */ 434 rtadvd_remove_timer(ifi->ifi_ra_timer); 435 ifi->ifi_ra_timer = NULL; 436 ifi->ifi_state = IFI_STATE_UNCONFIGURED; 437 continue; 438 } 439 440 ifi->ifi_state = IFI_STATE_TRANSITIVE; 441 442 /* Mark as the shut-down state. */ 443 ifi->ifi_rainfo_trans = ifi->ifi_rainfo; 444 ifi->ifi_rainfo = NULL; 445 446 ifi->ifi_burstcount = MAX_FINAL_RTR_ADVERTISEMENTS; 447 ifi->ifi_burstinterval = MIN_DELAY_BETWEEN_RAS; 448 449 ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm); 450 rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm, 451 ifi->ifi_ra_timer); 452 } 453 syslog(LOG_NOTICE, "final RA transmission started."); 454 455 pidfile_remove(pfh); 456 csock_close(&ctrlsock); 457 } 458 459 static void 460 rtmsg_input(struct sockinfo *s) 461 { 462 int n, type, ifindex = 0, plen; 463 size_t len; 464 char msg[2048], *next, *lim; 465 char ifname[IFNAMSIZ]; 466 struct if_announcemsghdr *ifan; 467 struct rt_msghdr *rtm; 468 struct prefix *pfx; 469 struct rainfo *rai; 470 struct in6_addr *addr; 471 struct ifinfo *ifi; 472 char addrbuf[INET6_ADDRSTRLEN]; 473 int prefixchange = 0; 474 475 if (s == NULL) { 476 syslog(LOG_ERR, "<%s> internal error", __func__); 477 exit(1); 478 } 479 n = read(s->si_fd, msg, sizeof(msg)); 480 rtm = (struct rt_msghdr *)msg; 481 syslog(LOG_DEBUG, "<%s> received a routing message " 482 "(type = %d, len = %d)", __func__, rtm->rtm_type, n); 483 484 if (n > rtm->rtm_msglen) { 485 /* 486 * This usually won't happen for messages received on 487 * a routing socket. 488 */ 489 syslog(LOG_DEBUG, 490 "<%s> received data length is larger than " 491 "1st routing message len. multiple messages? " 492 "read %d bytes, but 1st msg len = %d", 493 __func__, n, rtm->rtm_msglen); 494 #if 0 495 /* adjust length */ 496 n = rtm->rtm_msglen; 497 #endif 498 } 499 500 lim = msg + n; 501 for (next = msg; next < lim; next += len) { 502 int oldifflags; 503 504 next = get_next_msg(next, lim, 0, &len, 505 RTADV_TYPE2BITMASK(RTM_ADD) | 506 RTADV_TYPE2BITMASK(RTM_DELETE) | 507 RTADV_TYPE2BITMASK(RTM_NEWADDR) | 508 RTADV_TYPE2BITMASK(RTM_DELADDR) | 509 RTADV_TYPE2BITMASK(RTM_IFINFO) | 510 RTADV_TYPE2BITMASK(RTM_IFANNOUNCE)); 511 if (len == 0) 512 break; 513 type = ((struct rt_msghdr *)next)->rtm_type; 514 switch (type) { 515 case RTM_ADD: 516 case RTM_DELETE: 517 ifindex = get_rtm_ifindex(next); 518 break; 519 case RTM_NEWADDR: 520 case RTM_DELADDR: 521 ifindex = (int)((struct ifa_msghdr *)next)->ifam_index; 522 break; 523 case RTM_IFINFO: 524 ifindex = (int)((struct if_msghdr *)next)->ifm_index; 525 break; 526 case RTM_IFANNOUNCE: 527 ifan = (struct if_announcemsghdr *)next; 528 switch (ifan->ifan_what) { 529 case IFAN_ARRIVAL: 530 case IFAN_DEPARTURE: 531 break; 532 default: 533 syslog(LOG_DEBUG, 534 "<%s:%d> unknown ifan msg (ifan_what=%d)", 535 __func__, __LINE__, ifan->ifan_what); 536 continue; 537 } 538 539 syslog(LOG_DEBUG, "<%s>: if_announcemsg (idx=%d:%d)", 540 __func__, ifan->ifan_index, ifan->ifan_what); 541 switch (ifan->ifan_what) { 542 case IFAN_ARRIVAL: 543 syslog(LOG_NOTICE, 544 "interface added (idx=%d)", 545 ifan->ifan_index); 546 update_ifinfo(&ifilist, ifan->ifan_index); 547 loadconfig_index(ifan->ifan_index); 548 break; 549 case IFAN_DEPARTURE: 550 syslog(LOG_NOTICE, 551 "interface removed (idx=%d)", 552 ifan->ifan_index); 553 rm_ifinfo_index(ifan->ifan_index); 554 555 /* Clear ifi_ifindex */ 556 TAILQ_FOREACH(ifi, &ifilist, ifi_next) { 557 if (ifi->ifi_ifindex 558 == ifan->ifan_index) { 559 ifi->ifi_ifindex = 0; 560 break; 561 } 562 } 563 update_ifinfo(&ifilist, ifan->ifan_index); 564 break; 565 } 566 continue; 567 default: 568 /* should not reach here */ 569 syslog(LOG_DEBUG, 570 "<%s:%d> unknown rtmsg %d on %s", 571 __func__, __LINE__, type, 572 if_indextoname(ifindex, ifname)); 573 continue; 574 } 575 ifi = if_indextoifinfo(ifindex); 576 if (ifi == NULL) { 577 syslog(LOG_DEBUG, 578 "<%s> ifinfo not found for idx=%d. Why?", 579 __func__, ifindex); 580 continue; 581 } 582 rai = ifi->ifi_rainfo; 583 if (rai == NULL) { 584 syslog(LOG_DEBUG, 585 "<%s> route changed on " 586 "non advertising interface(%s)", 587 __func__, ifi->ifi_ifname); 588 continue; 589 } 590 591 oldifflags = ifi->ifi_flags; 592 /* init ifflags because it may have changed */ 593 update_ifinfo(&ifilist, ifindex); 594 595 switch (type) { 596 case RTM_ADD: 597 if (sflag) 598 break; /* we aren't interested in prefixes */ 599 600 addr = get_addr(msg); 601 plen = get_prefixlen(msg); 602 /* sanity check for plen */ 603 /* as RFC2373, prefixlen is at least 4 */ 604 if (plen < 4 || plen > 127) { 605 syslog(LOG_INFO, "<%s> new interface route's" 606 "plen %d is invalid for a prefix", 607 __func__, plen); 608 break; 609 } 610 pfx = find_prefix(rai, addr, plen); 611 if (pfx) { 612 if (pfx->pfx_timer) { 613 /* 614 * If the prefix has been invalidated, 615 * make it available again. 616 */ 617 update_prefix(pfx); 618 prefixchange = 1; 619 } else 620 syslog(LOG_DEBUG, 621 "<%s> new prefix(%s/%d) " 622 "added on %s, " 623 "but it was already in list", 624 __func__, 625 inet_ntop(AF_INET6, addr, 626 (char *)addrbuf, 627 sizeof(addrbuf)), 628 plen, ifi->ifi_ifname); 629 break; 630 } 631 make_prefix(rai, ifindex, addr, plen); 632 prefixchange = 1; 633 break; 634 case RTM_DELETE: 635 if (sflag) 636 break; 637 638 addr = get_addr(msg); 639 plen = get_prefixlen(msg); 640 /* sanity check for plen */ 641 /* as RFC2373, prefixlen is at least 4 */ 642 if (plen < 4 || plen > 127) { 643 syslog(LOG_INFO, 644 "<%s> deleted interface route's " 645 "plen %d is invalid for a prefix", 646 __func__, plen); 647 break; 648 } 649 pfx = find_prefix(rai, addr, plen); 650 if (pfx == NULL) { 651 syslog(LOG_DEBUG, 652 "<%s> prefix(%s/%d) was deleted on %s, " 653 "but it was not in list", 654 __func__, inet_ntop(AF_INET6, addr, 655 (char *)addrbuf, sizeof(addrbuf)), 656 plen, ifi->ifi_ifname); 657 break; 658 } 659 invalidate_prefix(pfx); 660 prefixchange = 1; 661 break; 662 case RTM_NEWADDR: 663 case RTM_DELADDR: 664 case RTM_IFINFO: 665 break; 666 default: 667 /* should not reach here */ 668 syslog(LOG_DEBUG, 669 "<%s:%d> unknown rtmsg %d on %s", 670 __func__, __LINE__, type, 671 if_indextoname(ifindex, ifname)); 672 return; 673 } 674 675 /* check if an interface flag is changed */ 676 if ((oldifflags & IFF_UP) && /* UP to DOWN */ 677 !(ifi->ifi_flags & IFF_UP)) { 678 syslog(LOG_NOTICE, 679 "<interface %s becomes down. stop timer.", 680 ifi->ifi_ifname); 681 rtadvd_remove_timer(ifi->ifi_ra_timer); 682 ifi->ifi_ra_timer = NULL; 683 } else if (!(oldifflags & IFF_UP) && /* DOWN to UP */ 684 (ifi->ifi_flags & IFF_UP)) { 685 syslog(LOG_NOTICE, 686 "interface %s becomes up. restart timer.", 687 ifi->ifi_ifname); 688 689 ifi->ifi_state = IFI_STATE_TRANSITIVE; 690 ifi->ifi_burstcount = 691 MAX_INITIAL_RTR_ADVERTISEMENTS; 692 ifi->ifi_burstinterval = 693 MAX_INITIAL_RTR_ADVERT_INTERVAL; 694 695 ifi->ifi_ra_timer = rtadvd_add_timer(ra_timeout, 696 ra_timer_update, ifi, ifi); 697 ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm); 698 rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm, 699 ifi->ifi_ra_timer); 700 } else if (prefixchange && 701 (ifi->ifi_flags & IFF_UP)) { 702 /* 703 * An advertised prefix has been added or invalidated. 704 * Will notice the change in a short delay. 705 */ 706 set_short_delay(ifi); 707 } 708 } 709 } 710 711 void 712 rtadvd_input(struct sockinfo *s) 713 { 714 ssize_t i; 715 int *hlimp = NULL; 716 #ifdef OLDRAWSOCKET 717 struct ip6_hdr *ip; 718 #endif 719 struct icmp6_hdr *icp; 720 int ifindex = 0; 721 struct cmsghdr *cm; 722 struct in6_pktinfo *pi = NULL; 723 char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ]; 724 struct in6_addr dst = in6addr_any; 725 struct ifinfo *ifi; 726 727 syslog(LOG_DEBUG, "<%s> enter", __func__); 728 729 if (s == NULL) { 730 syslog(LOG_ERR, "<%s> internal error", __func__); 731 exit(1); 732 } 733 /* 734 * Get message. We reset msg_controllen since the field could 735 * be modified if we had received a message before setting 736 * receive options. 737 */ 738 rcvmhdr.msg_controllen = rcvcmsgbuflen; 739 if ((i = recvmsg(s->si_fd, &rcvmhdr, 0)) < 0) 740 return; 741 742 /* extract optional information via Advanced API */ 743 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&rcvmhdr); 744 cm; 745 cm = (struct cmsghdr *)CMSG_NXTHDR(&rcvmhdr, cm)) { 746 if (cm->cmsg_level == IPPROTO_IPV6 && 747 cm->cmsg_type == IPV6_PKTINFO && 748 cm->cmsg_len == CMSG_LEN(sizeof(struct in6_pktinfo))) { 749 pi = (struct in6_pktinfo *)(CMSG_DATA(cm)); 750 ifindex = pi->ipi6_ifindex; 751 dst = pi->ipi6_addr; 752 } 753 if (cm->cmsg_level == IPPROTO_IPV6 && 754 cm->cmsg_type == IPV6_HOPLIMIT && 755 cm->cmsg_len == CMSG_LEN(sizeof(int))) 756 hlimp = (int *)CMSG_DATA(cm); 757 } 758 if (ifindex == 0) { 759 syslog(LOG_ERR, "failed to get receiving interface"); 760 return; 761 } 762 if (hlimp == NULL) { 763 syslog(LOG_ERR, "failed to get receiving hop limit"); 764 return; 765 } 766 767 /* 768 * If we happen to receive data on an interface which is now gone 769 * or down, just discard the data. 770 */ 771 ifi = if_indextoifinfo(pi->ipi6_ifindex); 772 if (ifi == NULL || !(ifi->ifi_flags & IFF_UP)) { 773 syslog(LOG_INFO, 774 "<%s> received data on a disabled interface (%s)", 775 __func__, 776 (ifi == NULL) ? "[gone]" : ifi->ifi_ifname); 777 return; 778 } 779 780 #ifdef OLDRAWSOCKET 781 if ((size_t)i < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr)) { 782 syslog(LOG_ERR, 783 "packet size(%d) is too short", i); 784 return; 785 } 786 787 ip = (struct ip6_hdr *)rcvmhdr.msg_iov[0].iov_base; 788 icp = (struct icmp6_hdr *)(ip + 1); /* XXX: ext. hdr? */ 789 #else 790 if ((size_t)i < sizeof(struct icmp6_hdr)) { 791 syslog(LOG_ERR, "packet size(%zd) is too short", i); 792 return; 793 } 794 795 icp = (struct icmp6_hdr *)rcvmhdr.msg_iov[0].iov_base; 796 #endif 797 798 switch (icp->icmp6_type) { 799 case ND_ROUTER_SOLICIT: 800 /* 801 * Message verification - RFC 4861 6.1.1 802 * XXX: these checks must be done in the kernel as well, 803 * but we can't completely rely on them. 804 */ 805 if (*hlimp != 255) { 806 syslog(LOG_NOTICE, 807 "RS with invalid hop limit(%d) " 808 "received from %s on %s", 809 *hlimp, 810 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf, 811 sizeof(ntopbuf)), 812 if_indextoname(pi->ipi6_ifindex, ifnamebuf)); 813 return; 814 } 815 if (icp->icmp6_code) { 816 syslog(LOG_NOTICE, 817 "RS with invalid ICMP6 code(%d) " 818 "received from %s on %s", 819 icp->icmp6_code, 820 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf, 821 sizeof(ntopbuf)), 822 if_indextoname(pi->ipi6_ifindex, ifnamebuf)); 823 return; 824 } 825 if ((size_t)i < sizeof(struct nd_router_solicit)) { 826 syslog(LOG_NOTICE, 827 "RS from %s on %s does not have enough " 828 "length (len = %zd)", 829 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf, 830 sizeof(ntopbuf)), 831 if_indextoname(pi->ipi6_ifindex, ifnamebuf), i); 832 return; 833 } 834 rs_input(i, (struct nd_router_solicit *)icp, pi, &rcvfrom); 835 break; 836 case ND_ROUTER_ADVERT: 837 /* 838 * Message verification - RFC 4861 6.1.2 839 * XXX: there's the same dilemma as above... 840 */ 841 if (!IN6_IS_ADDR_LINKLOCAL(&rcvfrom.sin6_addr)) { 842 syslog(LOG_NOTICE, 843 "RA with non-linklocal source address " 844 "received from %s on %s", 845 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, 846 ntopbuf, sizeof(ntopbuf)), 847 if_indextoname(pi->ipi6_ifindex, ifnamebuf)); 848 return; 849 } 850 if (*hlimp != 255) { 851 syslog(LOG_NOTICE, 852 "RA with invalid hop limit(%d) " 853 "received from %s on %s", 854 *hlimp, 855 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf, 856 sizeof(ntopbuf)), 857 if_indextoname(pi->ipi6_ifindex, ifnamebuf)); 858 return; 859 } 860 if (icp->icmp6_code) { 861 syslog(LOG_NOTICE, 862 "RA with invalid ICMP6 code(%d) " 863 "received from %s on %s", 864 icp->icmp6_code, 865 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf, 866 sizeof(ntopbuf)), 867 if_indextoname(pi->ipi6_ifindex, ifnamebuf)); 868 return; 869 } 870 if ((size_t)i < sizeof(struct nd_router_advert)) { 871 syslog(LOG_NOTICE, 872 "RA from %s on %s does not have enough " 873 "length (len = %zd)", 874 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf, 875 sizeof(ntopbuf)), 876 if_indextoname(pi->ipi6_ifindex, ifnamebuf), i); 877 return; 878 } 879 ra_input(i, (struct nd_router_advert *)icp, pi, &rcvfrom); 880 break; 881 case ICMP6_ROUTER_RENUMBERING: 882 if (mcastif == NULL) { 883 syslog(LOG_ERR, "received a router renumbering " 884 "message, but not allowed to be accepted"); 885 break; 886 } 887 rr_input(i, (struct icmp6_router_renum *)icp, pi, &rcvfrom, 888 &dst); 889 break; 890 default: 891 /* 892 * Note that this case is POSSIBLE, especially just 893 * after invocation of the daemon. This is because we 894 * could receive message after opening the socket and 895 * before setting ICMP6 type filter(see sock_open()). 896 */ 897 syslog(LOG_ERR, "invalid icmp type(%d)", icp->icmp6_type); 898 return; 899 } 900 } 901 902 static void 903 rs_input(int len, struct nd_router_solicit *rs, 904 struct in6_pktinfo *pi, struct sockaddr_in6 *from) 905 { 906 char ntopbuf[INET6_ADDRSTRLEN]; 907 char ifnamebuf[IFNAMSIZ]; 908 union nd_opt ndopts; 909 struct rainfo *rai; 910 struct ifinfo *ifi; 911 struct soliciter *sol; 912 913 syslog(LOG_DEBUG, 914 "<%s> RS received from %s on %s", 915 __func__, 916 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), 917 if_indextoname(pi->ipi6_ifindex, ifnamebuf)); 918 919 /* ND option check */ 920 memset(&ndopts, 0, sizeof(ndopts)); 921 TAILQ_INIT(&ndopts.opt_list); 922 if (nd6_options((struct nd_opt_hdr *)(rs + 1), 923 len - sizeof(struct nd_router_solicit), 924 &ndopts, NDOPT_FLAG_SRCLINKADDR)) { 925 syslog(LOG_INFO, 926 "<%s> ND option check failed for an RS from %s on %s", 927 __func__, 928 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 929 sizeof(ntopbuf)), 930 if_indextoname(pi->ipi6_ifindex, ifnamebuf)); 931 return; 932 } 933 934 /* 935 * If the IP source address is the unspecified address, there 936 * must be no source link-layer address option in the message. 937 * (RFC 4861 6.1.1) 938 */ 939 if (IN6_IS_ADDR_UNSPECIFIED(&from->sin6_addr) && 940 ndopts.opt_src_lladdr) { 941 syslog(LOG_INFO, 942 "<%s> RS from unspecified src on %s has a link-layer" 943 " address option", 944 __func__, if_indextoname(pi->ipi6_ifindex, ifnamebuf)); 945 goto done; 946 } 947 948 ifi = if_indextoifinfo(pi->ipi6_ifindex); 949 if (ifi == NULL) { 950 syslog(LOG_INFO, 951 "<%s> if (idx=%d) not found. Why?", 952 __func__, pi->ipi6_ifindex); 953 goto done; 954 } 955 rai = ifi->ifi_rainfo; 956 if (rai == NULL) { 957 syslog(LOG_INFO, 958 "<%s> RS received on non advertising interface(%s)", 959 __func__, 960 if_indextoname(pi->ipi6_ifindex, ifnamebuf)); 961 goto done; 962 } 963 964 rai->rai_ifinfo->ifi_rsinput++; 965 966 /* 967 * Decide whether to send RA according to the rate-limit 968 * consideration. 969 */ 970 971 /* record sockaddr waiting for RA, if possible */ 972 sol = (struct soliciter *)malloc(sizeof(*sol)); 973 if (sol) { 974 sol->sol_addr = *from; 975 /* XXX RFC 2553 need clarification on flowinfo */ 976 sol->sol_addr.sin6_flowinfo = 0; 977 TAILQ_INSERT_TAIL(&rai->rai_soliciter, sol, sol_next); 978 } 979 980 /* 981 * If there is already a waiting RS packet, don't 982 * update the timer. 983 */ 984 if (ifi->ifi_rs_waitcount++) 985 goto done; 986 987 set_short_delay(ifi); 988 989 done: 990 free_ndopts(&ndopts); 991 } 992 993 static void 994 set_short_delay(struct ifinfo *ifi) 995 { 996 long delay; /* must not be greater than 1000000 */ 997 struct timespec interval, now, min_delay, tm_tmp, *rest; 998 999 if (ifi->ifi_ra_timer == NULL) 1000 return; 1001 /* 1002 * Compute a random delay. If the computed value 1003 * corresponds to a time later than the time the next 1004 * multicast RA is scheduled to be sent, ignore the random 1005 * delay and send the advertisement at the 1006 * already-scheduled time. RFC 4861 6.2.6 1007 */ 1008 delay = arc4random_uniform(MAX_RA_DELAY_TIME); 1009 interval.tv_sec = 0; 1010 interval.tv_nsec = delay * 1000; 1011 rest = rtadvd_timer_rest(ifi->ifi_ra_timer); 1012 if (TS_CMP(rest, &interval, <)) { 1013 syslog(LOG_DEBUG, "<%s> random delay is larger than " 1014 "the rest of the current timer", __func__); 1015 interval = *rest; 1016 } 1017 1018 /* 1019 * If we sent a multicast Router Advertisement within 1020 * the last MIN_DELAY_BETWEEN_RAS seconds, schedule 1021 * the advertisement to be sent at a time corresponding to 1022 * MIN_DELAY_BETWEEN_RAS plus the random value after the 1023 * previous advertisement was sent. 1024 */ 1025 clock_gettime(CLOCK_MONOTONIC_FAST, &now); 1026 TS_SUB(&now, &ifi->ifi_ra_lastsent, &tm_tmp); 1027 min_delay.tv_sec = MIN_DELAY_BETWEEN_RAS; 1028 min_delay.tv_nsec = 0; 1029 if (TS_CMP(&tm_tmp, &min_delay, <)) { 1030 TS_SUB(&min_delay, &tm_tmp, &min_delay); 1031 TS_ADD(&min_delay, &interval, &interval); 1032 } 1033 rtadvd_set_timer(&interval, ifi->ifi_ra_timer); 1034 } 1035 1036 static int 1037 check_accept_rtadv(int idx) 1038 { 1039 struct ifinfo *ifi; 1040 1041 TAILQ_FOREACH(ifi, &ifilist, ifi_next) { 1042 if (ifi->ifi_ifindex == idx) 1043 break; 1044 } 1045 if (ifi == NULL) { 1046 syslog(LOG_DEBUG, 1047 "<%s> if (idx=%d) not found. Why?", 1048 __func__, idx); 1049 return (0); 1050 } 1051 1052 /* 1053 * RA_RECV: ND6_IFF_ACCEPT_RTADV 1054 * RA_SEND: ip6.forwarding 1055 */ 1056 if (update_ifinfo_nd_flags(ifi) != 0) { 1057 syslog(LOG_ERR, "cannot get nd6 flags (idx=%d)", idx); 1058 return (0); 1059 } 1060 1061 return (ifi->ifi_nd_flags & ND6_IFF_ACCEPT_RTADV); 1062 } 1063 1064 static void 1065 ra_input(int len, struct nd_router_advert *nra, 1066 struct in6_pktinfo *pi, struct sockaddr_in6 *from) 1067 { 1068 struct rainfo *rai; 1069 struct ifinfo *ifi; 1070 char ntopbuf[INET6_ADDRSTRLEN]; 1071 char ifnamebuf[IFNAMSIZ]; 1072 union nd_opt ndopts; 1073 const char *on_off[] = {"OFF", "ON"}; 1074 uint32_t reachabletime, retranstimer, mtu; 1075 int inconsistent = 0; 1076 int error; 1077 1078 syslog(LOG_DEBUG, "<%s> RA received from %s on %s", __func__, 1079 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), 1080 if_indextoname(pi->ipi6_ifindex, ifnamebuf)); 1081 1082 /* ND option check */ 1083 memset(&ndopts, 0, sizeof(ndopts)); 1084 TAILQ_INIT(&ndopts.opt_list); 1085 error = nd6_options((struct nd_opt_hdr *)(nra + 1), 1086 len - sizeof(struct nd_router_advert), &ndopts, 1087 NDOPT_FLAG_SRCLINKADDR | NDOPT_FLAG_PREFIXINFO | NDOPT_FLAG_MTU | 1088 NDOPT_FLAG_RDNSS | NDOPT_FLAG_DNSSL | NDOPT_FLAG_PREF64); 1089 if (error) { 1090 syslog(LOG_INFO, 1091 "<%s> ND option check failed for an RA from %s on %s", 1092 __func__, 1093 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1094 sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex, 1095 ifnamebuf)); 1096 return; 1097 } 1098 1099 /* 1100 * RA consistency check according to RFC 4861 6.2.7 1101 */ 1102 ifi = if_indextoifinfo(pi->ipi6_ifindex); 1103 if (ifi->ifi_rainfo == NULL) { 1104 syslog(LOG_INFO, 1105 "<%s> received RA from %s on non-advertising" 1106 " interface(%s)", 1107 __func__, 1108 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1109 sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex, 1110 ifnamebuf)); 1111 goto done; 1112 } 1113 rai = ifi->ifi_rainfo; 1114 ifi->ifi_rainput++; 1115 syslog(LOG_DEBUG, "<%s> ifi->ifi_rainput = %" PRIu64, __func__, 1116 ifi->ifi_rainput); 1117 1118 /* Cur Hop Limit value */ 1119 if (nra->nd_ra_curhoplimit && rai->rai_hoplimit && 1120 nra->nd_ra_curhoplimit != rai->rai_hoplimit) { 1121 syslog(LOG_NOTICE, 1122 "CurHopLimit inconsistent on %s:" 1123 " %d from %s, %d from us", 1124 ifi->ifi_ifname, nra->nd_ra_curhoplimit, 1125 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1126 sizeof(ntopbuf)), rai->rai_hoplimit); 1127 inconsistent++; 1128 } 1129 /* M flag */ 1130 if ((nra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED) != 1131 rai->rai_managedflg) { 1132 syslog(LOG_NOTICE, 1133 "M flag inconsistent on %s:" 1134 " %s from %s, %s from us", 1135 ifi->ifi_ifname, on_off[!rai->rai_managedflg], 1136 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1137 sizeof(ntopbuf)), on_off[rai->rai_managedflg]); 1138 inconsistent++; 1139 } 1140 /* O flag */ 1141 if ((nra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER) != 1142 rai->rai_otherflg) { 1143 syslog(LOG_NOTICE, 1144 "O flag inconsistent on %s:" 1145 " %s from %s, %s from us", 1146 ifi->ifi_ifname, on_off[!rai->rai_otherflg], 1147 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1148 sizeof(ntopbuf)), on_off[rai->rai_otherflg]); 1149 inconsistent++; 1150 } 1151 #ifdef DRAFT_IETF_6MAN_IPV6ONLY_FLAG 1152 /* S "IPv6-Only" (Six, Silence-IPv4) flag */ 1153 if ((nra->nd_ra_flags_reserved & ND_RA_FLAG_IPV6_ONLY) != 1154 rai->rai_ipv6onlyflg) { 1155 syslog(LOG_NOTICE, 1156 "S flag inconsistent on %s:" 1157 " %s from %s, %s from us", 1158 ifi->ifi_ifname, on_off[!rai->rai_ipv6onlyflg], 1159 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1160 sizeof(ntopbuf)), on_off[rai->rai_ipv6onlyflg]); 1161 inconsistent++; 1162 } 1163 #endif 1164 /* Reachable Time */ 1165 reachabletime = ntohl(nra->nd_ra_reachable); 1166 if (reachabletime && rai->rai_reachabletime && 1167 reachabletime != rai->rai_reachabletime) { 1168 syslog(LOG_NOTICE, 1169 "ReachableTime inconsistent on %s:" 1170 " %d from %s, %d from us", 1171 ifi->ifi_ifname, reachabletime, 1172 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1173 sizeof(ntopbuf)), rai->rai_reachabletime); 1174 inconsistent++; 1175 } 1176 /* Retrans Timer */ 1177 retranstimer = ntohl(nra->nd_ra_retransmit); 1178 if (retranstimer && rai->rai_retranstimer && 1179 retranstimer != rai->rai_retranstimer) { 1180 syslog(LOG_NOTICE, 1181 "RetranceTimer inconsistent on %s:" 1182 " %d from %s, %d from us", 1183 ifi->ifi_ifname, retranstimer, 1184 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1185 sizeof(ntopbuf)), rai->rai_retranstimer); 1186 inconsistent++; 1187 } 1188 /* Values in the MTU options */ 1189 if (ndopts.opt_mtu) { 1190 mtu = ntohl(ndopts.opt_mtu->nd_opt_mtu_mtu); 1191 if (mtu && rai->rai_linkmtu && mtu != rai->rai_linkmtu) { 1192 syslog(LOG_NOTICE, 1193 "MTU option value inconsistent on %s:" 1194 " %d from %s, %d from us", 1195 ifi->ifi_ifname, mtu, 1196 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1197 sizeof(ntopbuf)), rai->rai_linkmtu); 1198 inconsistent++; 1199 } 1200 } 1201 /* Preferred and Valid Lifetimes for prefixes */ 1202 { 1203 struct nd_optlist *nol; 1204 1205 if (ndopts.opt_pi) 1206 if (prefix_check(ndopts.opt_pi, rai, from)) 1207 inconsistent++; 1208 1209 TAILQ_FOREACH(nol, &ndopts.opt_list, nol_next) 1210 if (prefix_check((struct nd_opt_prefix_info *)nol->nol_opt, 1211 rai, from)) 1212 inconsistent++; 1213 } 1214 1215 if (inconsistent) 1216 ifi->ifi_rainconsistent++; 1217 1218 done: 1219 free_ndopts(&ndopts); 1220 } 1221 1222 static uint32_t 1223 udiff(uint32_t u, uint32_t v) 1224 { 1225 return (u >= v ? u - v : v - u); 1226 } 1227 1228 /* return a non-zero value if the received prefix is inconsistent with ours */ 1229 static int 1230 prefix_check(struct nd_opt_prefix_info *pinfo, 1231 struct rainfo *rai, struct sockaddr_in6 *from) 1232 { 1233 struct ifinfo *ifi; 1234 uint32_t preferred_time, valid_time; 1235 struct prefix *pfx; 1236 int inconsistent = 0; 1237 char ntopbuf[INET6_ADDRSTRLEN]; 1238 char prefixbuf[INET6_ADDRSTRLEN]; 1239 struct timespec now; 1240 1241 #if 0 /* impossible */ 1242 if (pinfo->nd_opt_pi_type != ND_OPT_PREFIX_INFORMATION) 1243 return (0); 1244 #endif 1245 ifi = rai->rai_ifinfo; 1246 /* 1247 * log if the adveritsed prefix has link-local scope(sanity check?) 1248 */ 1249 if (IN6_IS_ADDR_LINKLOCAL(&pinfo->nd_opt_pi_prefix)) 1250 syslog(LOG_INFO, 1251 "<%s> link-local prefix %s/%d is advertised " 1252 "from %s on %s", 1253 __func__, 1254 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf, 1255 sizeof(prefixbuf)), 1256 pinfo->nd_opt_pi_prefix_len, 1257 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1258 sizeof(ntopbuf)), ifi->ifi_ifname); 1259 1260 if ((pfx = find_prefix(rai, &pinfo->nd_opt_pi_prefix, 1261 pinfo->nd_opt_pi_prefix_len)) == NULL) { 1262 syslog(LOG_INFO, 1263 "<%s> prefix %s/%d from %s on %s is not in our list", 1264 __func__, 1265 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf, 1266 sizeof(prefixbuf)), 1267 pinfo->nd_opt_pi_prefix_len, 1268 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1269 sizeof(ntopbuf)), ifi->ifi_ifname); 1270 return (0); 1271 } 1272 1273 preferred_time = ntohl(pinfo->nd_opt_pi_preferred_time); 1274 if (pfx->pfx_pltimeexpire) { 1275 /* 1276 * The lifetime is decremented in real time, so we should 1277 * compare the expiration time. 1278 * (RFC 2461 Section 6.2.7.) 1279 * XXX: can we really expect that all routers on the link 1280 * have synchronized clocks? 1281 */ 1282 clock_gettime(CLOCK_MONOTONIC_FAST, &now); 1283 preferred_time += now.tv_sec; 1284 1285 if (!pfx->pfx_timer && rai->rai_clockskew && 1286 udiff(preferred_time, pfx->pfx_pltimeexpire) > rai->rai_clockskew) { 1287 syslog(LOG_INFO, 1288 "<%s> preferred lifetime for %s/%d" 1289 " (decr. in real time) inconsistent on %s:" 1290 " %" PRIu32 " from %s, %" PRIu32 " from us", 1291 __func__, 1292 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf, 1293 sizeof(prefixbuf)), 1294 pinfo->nd_opt_pi_prefix_len, 1295 ifi->ifi_ifname, preferred_time, 1296 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1297 sizeof(ntopbuf)), pfx->pfx_pltimeexpire); 1298 inconsistent++; 1299 } 1300 } else if (!pfx->pfx_timer && preferred_time != pfx->pfx_preflifetime) 1301 syslog(LOG_INFO, 1302 "<%s> preferred lifetime for %s/%d" 1303 " inconsistent on %s:" 1304 " %d from %s, %d from us", 1305 __func__, 1306 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf, 1307 sizeof(prefixbuf)), 1308 pinfo->nd_opt_pi_prefix_len, 1309 ifi->ifi_ifname, preferred_time, 1310 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1311 sizeof(ntopbuf)), pfx->pfx_preflifetime); 1312 1313 valid_time = ntohl(pinfo->nd_opt_pi_valid_time); 1314 if (pfx->pfx_vltimeexpire) { 1315 clock_gettime(CLOCK_MONOTONIC_FAST, &now); 1316 valid_time += now.tv_sec; 1317 1318 if (!pfx->pfx_timer && rai->rai_clockskew && 1319 udiff(valid_time, pfx->pfx_vltimeexpire) > rai->rai_clockskew) { 1320 syslog(LOG_INFO, 1321 "<%s> valid lifetime for %s/%d" 1322 " (decr. in real time) inconsistent on %s:" 1323 " %d from %s, %" PRIu32 " from us", 1324 __func__, 1325 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf, 1326 sizeof(prefixbuf)), 1327 pinfo->nd_opt_pi_prefix_len, 1328 ifi->ifi_ifname, preferred_time, 1329 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1330 sizeof(ntopbuf)), pfx->pfx_vltimeexpire); 1331 inconsistent++; 1332 } 1333 } else if (!pfx->pfx_timer && valid_time != pfx->pfx_validlifetime) { 1334 syslog(LOG_INFO, 1335 "<%s> valid lifetime for %s/%d" 1336 " inconsistent on %s:" 1337 " %d from %s, %d from us", 1338 __func__, 1339 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf, 1340 sizeof(prefixbuf)), 1341 pinfo->nd_opt_pi_prefix_len, 1342 ifi->ifi_ifname, valid_time, 1343 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1344 sizeof(ntopbuf)), pfx->pfx_validlifetime); 1345 inconsistent++; 1346 } 1347 1348 return (inconsistent); 1349 } 1350 1351 struct prefix * 1352 find_prefix(struct rainfo *rai, struct in6_addr *prefix, int plen) 1353 { 1354 struct prefix *pfx; 1355 int bytelen, bitlen; 1356 char bitmask; 1357 1358 TAILQ_FOREACH(pfx, &rai->rai_prefix, pfx_next) { 1359 if (plen != pfx->pfx_prefixlen) 1360 continue; 1361 1362 bytelen = plen / 8; 1363 bitlen = plen % 8; 1364 bitmask = 0xff << (8 - bitlen); 1365 1366 if (memcmp((void *)prefix, (void *)&pfx->pfx_prefix, bytelen)) 1367 continue; 1368 1369 if (bitlen == 0 || 1370 ((prefix->s6_addr[bytelen] & bitmask) == 1371 (pfx->pfx_prefix.s6_addr[bytelen] & bitmask))) { 1372 return (pfx); 1373 } 1374 } 1375 1376 return (NULL); 1377 } 1378 1379 /* check if p0/plen0 matches p1/plen1; return 1 if matches, otherwise 0. */ 1380 int 1381 prefix_match(struct in6_addr *p0, int plen0, 1382 struct in6_addr *p1, int plen1) 1383 { 1384 int bytelen, bitlen; 1385 char bitmask; 1386 1387 if (plen0 < plen1) 1388 return (0); 1389 1390 bytelen = plen1 / 8; 1391 bitlen = plen1 % 8; 1392 bitmask = 0xff << (8 - bitlen); 1393 1394 if (memcmp((void *)p0, (void *)p1, bytelen)) 1395 return (0); 1396 1397 if (bitlen == 0 || 1398 ((p0->s6_addr[bytelen] & bitmask) == 1399 (p1->s6_addr[bytelen] & bitmask))) { 1400 return (1); 1401 } 1402 1403 return (0); 1404 } 1405 1406 static int 1407 nd6_options(struct nd_opt_hdr *hdr, int limit, 1408 union nd_opt *ndopts, uint32_t optflags) 1409 { 1410 int optlen = 0; 1411 1412 for (; limit > 0; limit -= optlen) { 1413 if ((size_t)limit < sizeof(struct nd_opt_hdr)) { 1414 syslog(LOG_INFO, "<%s> short option header", __func__); 1415 goto bad; 1416 } 1417 1418 hdr = (struct nd_opt_hdr *)((caddr_t)hdr + optlen); 1419 if (hdr->nd_opt_len == 0) { 1420 syslog(LOG_INFO, 1421 "<%s> bad ND option length(0) (type = %d)", 1422 __func__, hdr->nd_opt_type); 1423 goto bad; 1424 } 1425 optlen = hdr->nd_opt_len << 3; 1426 if (optlen > limit) { 1427 syslog(LOG_INFO, "<%s> short option", __func__); 1428 goto bad; 1429 } 1430 1431 if (hdr->nd_opt_type > ND_OPT_MTU && 1432 hdr->nd_opt_type != ND_OPT_RDNSS && 1433 hdr->nd_opt_type != ND_OPT_DNSSL && 1434 hdr->nd_opt_type != ND_OPT_PREF64) { 1435 syslog(LOG_INFO, "<%s> unknown ND option(type %d)", 1436 __func__, hdr->nd_opt_type); 1437 continue; 1438 } 1439 1440 if ((ndopt_flags[hdr->nd_opt_type] & optflags) == 0) { 1441 syslog(LOG_INFO, "<%s> unexpected ND option(type %d)", 1442 __func__, hdr->nd_opt_type); 1443 continue; 1444 } 1445 1446 /* 1447 * Option length check. Do it here for all fixed-length 1448 * options. 1449 */ 1450 switch (hdr->nd_opt_type) { 1451 case ND_OPT_MTU: 1452 if (optlen == sizeof(struct nd_opt_mtu)) 1453 break; 1454 goto skip; 1455 case ND_OPT_RDNSS: 1456 if (optlen >= 24 && 1457 (optlen - sizeof(struct nd_opt_rdnss)) % 16 == 0) 1458 break; 1459 goto skip; 1460 case ND_OPT_DNSSL: 1461 if (optlen >= 16 && 1462 (optlen - sizeof(struct nd_opt_dnssl)) % 8 == 0) 1463 break; 1464 goto skip; 1465 case ND_OPT_PREFIX_INFORMATION: 1466 if (optlen == sizeof(struct nd_opt_prefix_info)) 1467 break; 1468 skip: 1469 syslog(LOG_INFO, "<%s> invalid option length", 1470 __func__); 1471 continue; 1472 } 1473 1474 switch (hdr->nd_opt_type) { 1475 case ND_OPT_TARGET_LINKADDR: 1476 case ND_OPT_REDIRECTED_HEADER: 1477 case ND_OPT_RDNSS: 1478 case ND_OPT_DNSSL: 1479 case ND_OPT_PREF64: 1480 break; /* we don't care about these options */ 1481 case ND_OPT_SOURCE_LINKADDR: 1482 case ND_OPT_MTU: 1483 if (ndopts->opt_array[hdr->nd_opt_type]) { 1484 syslog(LOG_INFO, 1485 "<%s> duplicated ND option (type = %d)", 1486 __func__, hdr->nd_opt_type); 1487 } 1488 ndopts->opt_array[hdr->nd_opt_type] = hdr; 1489 break; 1490 case ND_OPT_PREFIX_INFORMATION: 1491 { 1492 struct nd_optlist *nol; 1493 1494 if (ndopts->opt_pi == 0) { 1495 ndopts->opt_pi = 1496 (struct nd_opt_prefix_info *)hdr; 1497 continue; 1498 } 1499 nol = malloc(sizeof(*nol)); 1500 if (nol == NULL) { 1501 syslog(LOG_ERR, "<%s> can't allocate memory", 1502 __func__); 1503 goto bad; 1504 } 1505 nol->nol_opt = hdr; 1506 TAILQ_INSERT_TAIL(&(ndopts->opt_list), nol, nol_next); 1507 1508 break; 1509 } 1510 default: /* impossible */ 1511 break; 1512 } 1513 } 1514 1515 return (0); 1516 1517 bad: 1518 free_ndopts(ndopts); 1519 1520 return (-1); 1521 } 1522 1523 static void 1524 free_ndopts(union nd_opt *ndopts) 1525 { 1526 struct nd_optlist *nol; 1527 1528 while ((nol = TAILQ_FIRST(&ndopts->opt_list)) != NULL) { 1529 TAILQ_REMOVE(&ndopts->opt_list, nol, nol_next); 1530 free(nol); 1531 } 1532 } 1533 1534 void 1535 sock_open(struct sockinfo *s) 1536 { 1537 struct icmp6_filter filt; 1538 int on; 1539 /* XXX: should be max MTU attached to the node */ 1540 static char answer[1500]; 1541 1542 syslog(LOG_DEBUG, "<%s> enter", __func__); 1543 1544 if (s == NULL) { 1545 syslog(LOG_ERR, "<%s> internal error", __func__); 1546 exit(1); 1547 } 1548 rcvcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + 1549 CMSG_SPACE(sizeof(int)); 1550 rcvcmsgbuf = (char *)malloc(rcvcmsgbuflen); 1551 if (rcvcmsgbuf == NULL) { 1552 syslog(LOG_ERR, "<%s> not enough core", __func__); 1553 exit(1); 1554 } 1555 1556 sndcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + 1557 CMSG_SPACE(sizeof(int)); 1558 sndcmsgbuf = (char *)malloc(sndcmsgbuflen); 1559 if (sndcmsgbuf == NULL) { 1560 syslog(LOG_ERR, "<%s> not enough core", __func__); 1561 exit(1); 1562 } 1563 1564 if ((s->si_fd = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) { 1565 syslog(LOG_ERR, "<%s> socket: %s", __func__, strerror(errno)); 1566 exit(1); 1567 } 1568 /* specify to tell receiving interface */ 1569 on = 1; 1570 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, 1571 sizeof(on)) < 0) { 1572 syslog(LOG_ERR, "<%s> IPV6_RECVPKTINFO: %s", __func__, 1573 strerror(errno)); 1574 exit(1); 1575 } 1576 on = 1; 1577 /* specify to tell value of hoplimit field of received IP6 hdr */ 1578 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, 1579 sizeof(on)) < 0) { 1580 syslog(LOG_ERR, "<%s> IPV6_RECVHOPLIMIT: %s", __func__, 1581 strerror(errno)); 1582 exit(1); 1583 } 1584 ICMP6_FILTER_SETBLOCKALL(&filt); 1585 ICMP6_FILTER_SETPASS(ND_ROUTER_SOLICIT, &filt); 1586 ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filt); 1587 if (mcastif != NULL) 1588 ICMP6_FILTER_SETPASS(ICMP6_ROUTER_RENUMBERING, &filt); 1589 1590 if (setsockopt(s->si_fd, IPPROTO_ICMPV6, ICMP6_FILTER, &filt, 1591 sizeof(filt)) < 0) { 1592 syslog(LOG_ERR, "<%s> IICMP6_FILTER: %s", 1593 __func__, strerror(errno)); 1594 exit(1); 1595 } 1596 1597 /* initialize msghdr for receiving packets */ 1598 rcviov[0].iov_base = (caddr_t)answer; 1599 rcviov[0].iov_len = sizeof(answer); 1600 rcvmhdr.msg_name = (caddr_t)&rcvfrom; 1601 rcvmhdr.msg_namelen = sizeof(rcvfrom); 1602 rcvmhdr.msg_iov = rcviov; 1603 rcvmhdr.msg_iovlen = 1; 1604 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; 1605 rcvmhdr.msg_controllen = rcvcmsgbuflen; 1606 1607 /* initialize msghdr for sending packets */ 1608 sndmhdr.msg_namelen = sizeof(struct sockaddr_in6); 1609 sndmhdr.msg_iov = sndiov; 1610 sndmhdr.msg_iovlen = 1; 1611 sndmhdr.msg_control = (caddr_t)sndcmsgbuf; 1612 sndmhdr.msg_controllen = sndcmsgbuflen; 1613 } 1614 1615 /* open a routing socket to watch the routing table */ 1616 static void 1617 rtsock_open(struct sockinfo *s) 1618 { 1619 if (s == NULL) { 1620 syslog(LOG_ERR, "<%s> internal error", __func__); 1621 exit(1); 1622 } 1623 if ((s->si_fd = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) { 1624 syslog(LOG_ERR, 1625 "<%s> socket: %s", __func__, strerror(errno)); 1626 exit(1); 1627 } 1628 } 1629 1630 struct ifinfo * 1631 if_indextoifinfo(int idx) 1632 { 1633 struct ifinfo *ifi; 1634 char *name, name0[IFNAMSIZ]; 1635 1636 /* Check if the interface has a valid name or not. */ 1637 if (if_indextoname(idx, name0) == NULL) 1638 return (NULL); 1639 1640 TAILQ_FOREACH(ifi, &ifilist, ifi_next) { 1641 if (ifi->ifi_ifindex == idx) 1642 return (ifi); 1643 } 1644 1645 if (ifi != NULL) 1646 syslog(LOG_DEBUG, "<%s> ifi found (idx=%d)", 1647 __func__, idx); 1648 else 1649 syslog(LOG_DEBUG, "<%s> ifi not found (idx=%d)", 1650 __func__, idx); 1651 1652 return (NULL); /* search failed */ 1653 } 1654 1655 void 1656 ra_output(struct ifinfo *ifi) 1657 { 1658 int i; 1659 struct cmsghdr *cm; 1660 struct in6_pktinfo *pi; 1661 struct soliciter *sol; 1662 struct rainfo *rai; 1663 1664 switch (ifi->ifi_state) { 1665 case IFI_STATE_CONFIGURED: 1666 rai = ifi->ifi_rainfo; 1667 break; 1668 case IFI_STATE_TRANSITIVE: 1669 rai = ifi->ifi_rainfo_trans; 1670 break; 1671 case IFI_STATE_UNCONFIGURED: 1672 syslog(LOG_DEBUG, "<%s> %s is unconfigured. " 1673 "Skip sending RAs.", 1674 __func__, ifi->ifi_ifname); 1675 return; 1676 default: 1677 rai = NULL; 1678 } 1679 if (rai == NULL) { 1680 syslog(LOG_DEBUG, "<%s> rainfo is NULL on %s." 1681 "Skip sending RAs.", 1682 __func__, ifi->ifi_ifname); 1683 return; 1684 } 1685 if (!(ifi->ifi_flags & IFF_UP)) { 1686 syslog(LOG_DEBUG, "<%s> %s is not up. " 1687 "Skip sending RAs.", 1688 __func__, ifi->ifi_ifname); 1689 return; 1690 } 1691 /* 1692 * Check lifetime, ACCEPT_RTADV flag, and ip6.forwarding. 1693 * 1694 * (lifetime == 0) = output 1695 * (lifetime != 0 && (check_accept_rtadv()) = no output 1696 * 1697 * Basically, hosts MUST NOT send Router Advertisement 1698 * messages at any time (RFC 4861, Section 6.2.3). However, it 1699 * would sometimes be useful to allow hosts to advertise some 1700 * parameters such as prefix information and link MTU. Thus, 1701 * we allow hosts to invoke rtadvd only when router lifetime 1702 * (on every advertising interface) is explicitly set 1703 * zero. (see also the above section) 1704 */ 1705 syslog(LOG_DEBUG, 1706 "<%s> check lifetime=%d, ACCEPT_RTADV=%d, ip6.forwarding=%d " 1707 "on %s", __func__, 1708 rai->rai_lifetime, 1709 check_accept_rtadv(ifi->ifi_ifindex), 1710 getinet6sysctl(IPV6CTL_FORWARDING), 1711 ifi->ifi_ifname); 1712 1713 if (rai->rai_lifetime != 0) { 1714 if (getinet6sysctl(IPV6CTL_FORWARDING) == 0) { 1715 syslog(LOG_ERR, 1716 "non-zero lifetime RA " 1717 "but net.inet6.ip6.forwarding=0. " 1718 "Ignored."); 1719 return; 1720 } 1721 if (check_accept_rtadv(ifi->ifi_ifindex)) { 1722 syslog(LOG_ERR, 1723 "non-zero lifetime RA " 1724 "on RA receiving interface %s." 1725 " Ignored.", ifi->ifi_ifname); 1726 return; 1727 } 1728 } 1729 1730 make_packet(rai); /* XXX: inefficient */ 1731 1732 sndmhdr.msg_name = (caddr_t)&sin6_linklocal_allnodes; 1733 sndmhdr.msg_iov[0].iov_base = (caddr_t)rai->rai_ra_data; 1734 sndmhdr.msg_iov[0].iov_len = rai->rai_ra_datalen; 1735 1736 cm = CMSG_FIRSTHDR(&sndmhdr); 1737 /* specify the outgoing interface */ 1738 cm->cmsg_level = IPPROTO_IPV6; 1739 cm->cmsg_type = IPV6_PKTINFO; 1740 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo)); 1741 pi = (struct in6_pktinfo *)CMSG_DATA(cm); 1742 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*XXX*/ 1743 pi->ipi6_ifindex = ifi->ifi_ifindex; 1744 1745 /* specify the hop limit of the packet */ 1746 { 1747 int hoplimit = 255; 1748 1749 cm = CMSG_NXTHDR(&sndmhdr, cm); 1750 cm->cmsg_level = IPPROTO_IPV6; 1751 cm->cmsg_type = IPV6_HOPLIMIT; 1752 cm->cmsg_len = CMSG_LEN(sizeof(int)); 1753 memcpy(CMSG_DATA(cm), &hoplimit, sizeof(int)); 1754 } 1755 1756 syslog(LOG_DEBUG, 1757 "<%s> send RA on %s, # of RS waitings = %d", 1758 __func__, ifi->ifi_ifname, ifi->ifi_rs_waitcount); 1759 1760 i = sendmsg(sock.si_fd, &sndmhdr, 0); 1761 1762 if (i < 0 || (size_t)i != rai->rai_ra_datalen) { 1763 if (i < 0) { 1764 syslog(LOG_ERR, "<%s> sendmsg on %s: %s", 1765 __func__, ifi->ifi_ifname, 1766 strerror(errno)); 1767 } 1768 } 1769 1770 /* 1771 * unicast advertisements 1772 * XXX commented out. reason: though spec does not forbit it, unicast 1773 * advert does not really help 1774 */ 1775 while ((sol = TAILQ_FIRST(&rai->rai_soliciter)) != NULL) { 1776 TAILQ_REMOVE(&rai->rai_soliciter, sol, sol_next); 1777 free(sol); 1778 } 1779 1780 /* update timestamp */ 1781 clock_gettime(CLOCK_MONOTONIC_FAST, &ifi->ifi_ra_lastsent); 1782 1783 /* update counter */ 1784 ifi->ifi_rs_waitcount = 0; 1785 ifi->ifi_raoutput++; 1786 1787 switch (ifi->ifi_state) { 1788 case IFI_STATE_CONFIGURED: 1789 if (ifi->ifi_burstcount > 0) 1790 ifi->ifi_burstcount--; 1791 break; 1792 case IFI_STATE_TRANSITIVE: 1793 ifi->ifi_burstcount--; 1794 if (ifi->ifi_burstcount == 0) { 1795 if (ifi->ifi_rainfo == ifi->ifi_rainfo_trans) { 1796 /* Initial burst finished. */ 1797 if (ifi->ifi_rainfo_trans != NULL) 1798 ifi->ifi_rainfo_trans = NULL; 1799 } 1800 1801 /* Remove burst RA information */ 1802 if (ifi->ifi_rainfo_trans != NULL) { 1803 rm_rainfo(ifi->ifi_rainfo_trans); 1804 ifi->ifi_rainfo_trans = NULL; 1805 } 1806 1807 if (ifi->ifi_rainfo != NULL) { 1808 /* 1809 * TRANSITIVE -> CONFIGURED 1810 * 1811 * After initial burst or transition from 1812 * one configuration to another, 1813 * ifi_rainfo always points to the next RA 1814 * information. 1815 */ 1816 ifi->ifi_state = IFI_STATE_CONFIGURED; 1817 syslog(LOG_DEBUG, 1818 "<%s> ifname=%s marked as " 1819 "CONFIGURED.", __func__, 1820 ifi->ifi_ifname); 1821 } else { 1822 /* 1823 * TRANSITIVE -> UNCONFIGURED 1824 * 1825 * If ifi_rainfo points to NULL, this 1826 * interface is shutting down. 1827 * 1828 */ 1829 int error; 1830 1831 ifi->ifi_state = IFI_STATE_UNCONFIGURED; 1832 syslog(LOG_DEBUG, 1833 "<%s> ifname=%s marked as " 1834 "UNCONFIGURED.", __func__, 1835 ifi->ifi_ifname); 1836 error = sock_mc_leave(&sock, 1837 ifi->ifi_ifindex); 1838 if (error) 1839 exit(1); 1840 } 1841 } 1842 break; 1843 } 1844 } 1845 1846 /* process RA timer */ 1847 struct rtadvd_timer * 1848 ra_timeout(void *arg) 1849 { 1850 struct ifinfo *ifi; 1851 1852 ifi = (struct ifinfo *)arg; 1853 syslog(LOG_DEBUG, "<%s> RA timer on %s is expired", 1854 __func__, ifi->ifi_ifname); 1855 1856 ra_output(ifi); 1857 1858 return (ifi->ifi_ra_timer); 1859 } 1860 1861 /* update RA timer */ 1862 void 1863 ra_timer_update(void *arg, struct timespec *tm) 1864 { 1865 uint16_t interval; 1866 struct rainfo *rai; 1867 struct ifinfo *ifi; 1868 1869 ifi = (struct ifinfo *)arg; 1870 rai = ifi->ifi_rainfo; 1871 interval = 0; 1872 1873 switch (ifi->ifi_state) { 1874 case IFI_STATE_UNCONFIGURED: 1875 return; 1876 break; 1877 case IFI_STATE_CONFIGURED: 1878 /* 1879 * Whenever a multicast advertisement is sent from 1880 * an interface, the timer is reset to a 1881 * uniformly-distributed random value between the 1882 * interface's configured MinRtrAdvInterval and 1883 * MaxRtrAdvInterval (RFC4861 6.2.4). 1884 */ 1885 interval = rai->rai_mininterval; 1886 interval += arc4random_uniform(rai->rai_maxinterval - 1887 rai->rai_mininterval); 1888 break; 1889 case IFI_STATE_TRANSITIVE: 1890 /* 1891 * For the first few advertisements (up to 1892 * MAX_INITIAL_RTR_ADVERTISEMENTS), if the randomly chosen 1893 * interval is greater than 1894 * MAX_INITIAL_RTR_ADVERT_INTERVAL, the timer SHOULD be 1895 * set to MAX_INITIAL_RTR_ADVERT_INTERVAL instead. (RFC 1896 * 4861 6.2.4) 1897 * 1898 * In such cases, the router SHOULD transmit one or more 1899 * (but not more than MAX_FINAL_RTR_ADVERTISEMENTS) final 1900 * multicast Router Advertisements on the interface with a 1901 * Router Lifetime field of zero. (RFC 4861 6.2.5) 1902 */ 1903 interval = ifi->ifi_burstinterval; 1904 break; 1905 } 1906 1907 tm->tv_sec = interval; 1908 tm->tv_nsec = 0; 1909 1910 syslog(LOG_DEBUG, 1911 "<%s> RA timer on %s is set to %ld:%ld", 1912 __func__, ifi->ifi_ifname, 1913 (long int)tm->tv_sec, (long int)tm->tv_nsec / 1000); 1914 } 1915