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 #define NDOPT_FLAG_ROUTEINFO (1 << 8) 142 143 static uint32_t ndopt_flags[] = { 144 [ND_OPT_SOURCE_LINKADDR] = NDOPT_FLAG_SRCLINKADDR, 145 [ND_OPT_TARGET_LINKADDR] = NDOPT_FLAG_TGTLINKADDR, 146 [ND_OPT_PREFIX_INFORMATION] = NDOPT_FLAG_PREFIXINFO, 147 [ND_OPT_REDIRECTED_HEADER] = NDOPT_FLAG_RDHDR, 148 [ND_OPT_MTU] = NDOPT_FLAG_MTU, 149 [ND_OPT_RDNSS] = NDOPT_FLAG_RDNSS, 150 [ND_OPT_DNSSL] = NDOPT_FLAG_DNSSL, 151 [ND_OPT_PREF64] = NDOPT_FLAG_PREF64, 152 [ND_OPT_ROUTE_INFO] = NDOPT_FLAG_ROUTEINFO, 153 }; 154 155 static void rtadvd_shutdown(void); 156 static void sock_open(struct sockinfo *); 157 static void rtsock_open(struct sockinfo *); 158 static void rtadvd_input(struct sockinfo *); 159 static void rs_input(int, struct nd_router_solicit *, 160 struct in6_pktinfo *, struct sockaddr_in6 *); 161 static void ra_input(int, struct nd_router_advert *, 162 struct in6_pktinfo *, struct sockaddr_in6 *); 163 static int prefix_check(struct nd_opt_prefix_info *, struct rainfo *, 164 struct sockaddr_in6 *); 165 static int nd6_options(struct nd_opt_hdr *, int, 166 union nd_opt *, uint32_t); 167 static void free_ndopts(union nd_opt *); 168 static void rtmsg_input(struct sockinfo *); 169 static void set_short_delay(struct ifinfo *); 170 static int check_accept_rtadv(int); 171 172 static void 173 usage(void) 174 { 175 176 fprintf(stderr, "usage: rtadvd [-dDfRs] " 177 "[-c configfile] [-C ctlsock] [-M ifname] [-p pidfile]\n"); 178 exit(1); 179 } 180 181 int 182 main(int argc, char *argv[]) 183 { 184 struct pollfd set[PFD_MAX]; 185 struct timespec *timeout; 186 int i, ch; 187 int fflag = 0, logopt; 188 int error; 189 pid_t pid, otherpid; 190 191 /* get command line options and arguments */ 192 while ((ch = getopt(argc, argv, "c:C:dDfhM:p:Rs")) != -1) { 193 switch (ch) { 194 case 'c': 195 conffile = optarg; 196 break; 197 case 'C': 198 ctrlsock.si_name = optarg; 199 break; 200 case 'd': 201 dflag++; 202 break; 203 case 'D': 204 dflag += 3; 205 break; 206 case 'f': 207 fflag = 1; 208 break; 209 case 'M': 210 mcastif = optarg; 211 break; 212 case 'R': 213 fprintf(stderr, "rtadvd: " 214 "the -R option is currently ignored.\n"); 215 /* accept_rr = 1; */ 216 /* run anyway... */ 217 break; 218 case 's': 219 sflag = 1; 220 break; 221 case 'p': 222 pidfilename = optarg; 223 break; 224 default: 225 usage(); 226 } 227 } 228 argc -= optind; 229 argv += optind; 230 231 logopt = LOG_NDELAY | LOG_PID; 232 if (fflag) 233 logopt |= LOG_PERROR; 234 openlog("rtadvd", logopt, LOG_DAEMON); 235 236 /* set log level */ 237 if (dflag > 2) 238 (void)setlogmask(LOG_UPTO(LOG_DEBUG)); 239 else if (dflag > 1) 240 (void)setlogmask(LOG_UPTO(LOG_INFO)); 241 else if (dflag > 0) 242 (void)setlogmask(LOG_UPTO(LOG_NOTICE)); 243 else 244 (void)setlogmask(LOG_UPTO(LOG_ERR)); 245 246 /* timer initialization */ 247 rtadvd_timer_init(); 248 249 pfh = pidfile_open(pidfilename, 0600, &otherpid); 250 if (pfh == NULL) { 251 if (errno == EEXIST) 252 errx(1, "%s already running, pid: %d", 253 getprogname(), otherpid); 254 syslog(LOG_ERR, 255 "failed to open the pid file %s, run anyway.", 256 pidfilename); 257 } 258 if (!fflag) 259 daemon(1, 0); 260 261 sock_open(&sock); 262 263 update_ifinfo(&ifilist, UPDATE_IFINFO_ALL); 264 for (i = 0; i < argc; i++) 265 update_persist_ifinfo(&ifilist, argv[i]); 266 267 csock_open(&ctrlsock, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH); 268 if (ctrlsock.si_fd == -1) { 269 syslog(LOG_ERR, "cannot open control socket: %s", 270 strerror(errno)); 271 exit(1); 272 } 273 274 /* record the current PID */ 275 pid = getpid(); 276 pidfile_write(pfh); 277 278 set[PFD_RAWSOCK].fd = sock.si_fd; 279 set[PFD_RAWSOCK].events = POLLIN; 280 if (sflag == 0) { 281 rtsock_open(&rtsock); 282 set[PFD_RTSOCK].fd = rtsock.si_fd; 283 set[PFD_RTSOCK].events = POLLIN; 284 } else 285 set[PFD_RTSOCK].fd = -1; 286 set[PFD_CSOCK].fd = ctrlsock.si_fd; 287 set[PFD_CSOCK].events = POLLIN; 288 signal(SIGTERM, set_do_shutdown); 289 signal(SIGINT, set_do_shutdown); 290 signal(SIGHUP, set_do_reload); 291 292 error = csock_listen(&ctrlsock); 293 if (error) { 294 syslog(LOG_ERR, "cannot listen control socket: %s", 295 strerror(errno)); 296 exit(1); 297 } 298 299 /* load configuration file */ 300 set_do_reload(0); 301 302 while (1) { 303 if (is_do_shutdown()) 304 rtadvd_shutdown(); 305 306 if (is_do_reload()) { 307 loadconfig_ifname(reload_ifname()); 308 if (reload_ifname() == NULL) 309 syslog(LOG_INFO, 310 "configuration file reloaded."); 311 else 312 syslog(LOG_INFO, 313 "configuration file for %s reloaded.", 314 reload_ifname()); 315 reset_do_reload(); 316 } 317 318 /* timeout handler update for active interfaces */ 319 rtadvd_update_timeout_handler(); 320 321 /* timer expiration check and reset the timer */ 322 timeout = rtadvd_check_timer(); 323 324 if (timeout != NULL) { 325 syslog(LOG_DEBUG, 326 "<%s> set timer to %ld:%ld. waiting for " 327 "inputs or timeout", __func__, 328 (long int)timeout->tv_sec, 329 (long int)timeout->tv_nsec / 1000); 330 } else { 331 syslog(LOG_DEBUG, 332 "<%s> there's no timer. waiting for inputs", 333 __func__); 334 } 335 if ((i = poll(set, nitems(set), 336 timeout ? (timeout->tv_sec * 1000 + 337 timeout->tv_nsec / 1000 / 1000) : INFTIM)) < 0) { 338 339 /* EINTR would occur if a signal was delivered */ 340 if (errno != EINTR) 341 syslog(LOG_ERR, "poll() failed: %s", 342 strerror(errno)); 343 continue; 344 } 345 if (i == 0) /* timeout */ 346 continue; 347 if (rtsock.si_fd != -1 && set[PFD_RTSOCK].revents & POLLIN) 348 rtmsg_input(&rtsock); 349 350 if (set[PFD_RAWSOCK].revents & POLLIN) 351 rtadvd_input(&sock); 352 353 if (set[PFD_CSOCK].revents & POLLIN) { 354 int fd; 355 356 fd = csock_accept(&ctrlsock); 357 if (fd == -1) 358 syslog(LOG_ERR, 359 "cannot accept() control socket: %s", 360 strerror(errno)); 361 else { 362 cm_handler_server(fd); 363 close(fd); 364 } 365 } 366 } 367 exit(0); /* NOTREACHED */ 368 } 369 370 static void 371 rtadvd_shutdown(void) 372 { 373 struct ifinfo *ifi; 374 struct rainfo *rai; 375 struct rdnss *rdn; 376 struct dnssl *dns; 377 struct rtinfo *rti; 378 379 if (wait_shutdown) { 380 syslog(LOG_INFO, 381 "waiting expiration of the all RA timers."); 382 383 TAILQ_FOREACH(ifi, &ifilist, ifi_next) { 384 /* 385 * Ignore !IFF_UP interfaces in waiting for shutdown. 386 */ 387 if (!(ifi->ifi_flags & IFF_UP) && 388 ifi->ifi_ra_timer != NULL) { 389 ifi->ifi_state = IFI_STATE_UNCONFIGURED; 390 rtadvd_remove_timer(ifi->ifi_ra_timer); 391 ifi->ifi_ra_timer = NULL; 392 syslog(LOG_DEBUG, "<%s> %s(idx=%d) is down. " 393 "Timer removed and marked as UNCONFIGURED.", 394 __func__, ifi->ifi_ifname, 395 ifi->ifi_ifindex); 396 } 397 } 398 TAILQ_FOREACH(ifi, &ifilist, ifi_next) { 399 if (ifi->ifi_ra_timer != NULL) 400 break; 401 } 402 if (ifi == NULL) { 403 syslog(LOG_NOTICE, "gracefully terminated."); 404 exit(0); 405 } 406 407 sleep(1); 408 return; 409 } 410 411 syslog(LOG_DEBUG, "<%s> cease to be an advertising router", 412 __func__); 413 414 wait_shutdown = 1; 415 416 TAILQ_FOREACH(rai, &railist, rai_next) { 417 rai->rai_lifetime = 0; 418 TAILQ_FOREACH(rdn, &rai->rai_rdnss, rd_next) 419 rdn->rd_ltime = 0; 420 TAILQ_FOREACH(dns, &rai->rai_dnssl, dn_next) 421 dns->dn_ltime = 0; 422 TAILQ_FOREACH(rti, &rai->rai_route, rti_next) 423 rti->rti_ltime = 0; 424 } 425 TAILQ_FOREACH(ifi, &ifilist, ifi_next) { 426 if (!ifi->ifi_persist) 427 continue; 428 if (ifi->ifi_state == IFI_STATE_UNCONFIGURED) 429 continue; 430 if (ifi->ifi_ra_timer == NULL) 431 continue; 432 if (ifi->ifi_ra_lastsent.tv_sec == 0 && 433 ifi->ifi_ra_lastsent.tv_nsec == 0 && 434 ifi->ifi_ra_timer != NULL) { 435 /* 436 * When RA configured but never sent, 437 * ignore the IF immediately. 438 */ 439 rtadvd_remove_timer(ifi->ifi_ra_timer); 440 ifi->ifi_ra_timer = NULL; 441 ifi->ifi_state = IFI_STATE_UNCONFIGURED; 442 continue; 443 } 444 445 ifi->ifi_state = IFI_STATE_TRANSITIVE; 446 447 /* Mark as the shut-down state. */ 448 ifi->ifi_rainfo_trans = ifi->ifi_rainfo; 449 ifi->ifi_rainfo = NULL; 450 451 ifi->ifi_burstcount = MAX_FINAL_RTR_ADVERTISEMENTS; 452 ifi->ifi_burstinterval = MIN_DELAY_BETWEEN_RAS; 453 454 ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm); 455 rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm, 456 ifi->ifi_ra_timer); 457 } 458 syslog(LOG_NOTICE, "final RA transmission started."); 459 460 pidfile_remove(pfh); 461 csock_close(&ctrlsock); 462 } 463 464 static void 465 rtmsg_input(struct sockinfo *s) 466 { 467 int n, type, ifindex = 0, plen; 468 size_t len; 469 char msg[2048], *next, *lim; 470 char ifname[IFNAMSIZ]; 471 struct if_announcemsghdr *ifan; 472 struct rt_msghdr *rtm; 473 struct prefix *pfx; 474 struct rainfo *rai; 475 struct in6_addr *addr; 476 struct ifinfo *ifi; 477 char addrbuf[INET6_ADDRSTRLEN]; 478 int prefixchange = 0; 479 480 if (s == NULL) { 481 syslog(LOG_ERR, "<%s> internal error", __func__); 482 exit(1); 483 } 484 n = read(s->si_fd, msg, sizeof(msg)); 485 rtm = (struct rt_msghdr *)msg; 486 syslog(LOG_DEBUG, "<%s> received a routing message " 487 "(type = %d, len = %d)", __func__, rtm->rtm_type, n); 488 489 if (n > rtm->rtm_msglen) { 490 /* 491 * This usually won't happen for messages received on 492 * a routing socket. 493 */ 494 syslog(LOG_DEBUG, 495 "<%s> received data length is larger than " 496 "1st routing message len. multiple messages? " 497 "read %d bytes, but 1st msg len = %d", 498 __func__, n, rtm->rtm_msglen); 499 #if 0 500 /* adjust length */ 501 n = rtm->rtm_msglen; 502 #endif 503 } 504 505 lim = msg + n; 506 for (next = msg; next < lim; next += len) { 507 int oldifflags; 508 509 next = get_next_msg(next, lim, 0, &len, 510 RTADV_TYPE2BITMASK(RTM_ADD) | 511 RTADV_TYPE2BITMASK(RTM_DELETE) | 512 RTADV_TYPE2BITMASK(RTM_NEWADDR) | 513 RTADV_TYPE2BITMASK(RTM_DELADDR) | 514 RTADV_TYPE2BITMASK(RTM_IFINFO) | 515 RTADV_TYPE2BITMASK(RTM_IFANNOUNCE)); 516 if (len == 0) 517 break; 518 type = ((struct rt_msghdr *)next)->rtm_type; 519 switch (type) { 520 case RTM_ADD: 521 case RTM_DELETE: 522 ifindex = get_rtm_ifindex(next); 523 break; 524 case RTM_NEWADDR: 525 case RTM_DELADDR: 526 ifindex = (int)((struct ifa_msghdr *)next)->ifam_index; 527 break; 528 case RTM_IFINFO: 529 ifindex = (int)((struct if_msghdr *)next)->ifm_index; 530 break; 531 case RTM_IFANNOUNCE: 532 ifan = (struct if_announcemsghdr *)next; 533 switch (ifan->ifan_what) { 534 case IFAN_ARRIVAL: 535 case IFAN_DEPARTURE: 536 break; 537 default: 538 syslog(LOG_DEBUG, 539 "<%s:%d> unknown ifan msg (ifan_what=%d)", 540 __func__, __LINE__, ifan->ifan_what); 541 continue; 542 } 543 544 syslog(LOG_DEBUG, "<%s>: if_announcemsg (idx=%d:%d)", 545 __func__, ifan->ifan_index, ifan->ifan_what); 546 switch (ifan->ifan_what) { 547 case IFAN_ARRIVAL: 548 syslog(LOG_NOTICE, 549 "interface added (idx=%d)", 550 ifan->ifan_index); 551 update_ifinfo(&ifilist, ifan->ifan_index); 552 loadconfig_index(ifan->ifan_index); 553 break; 554 case IFAN_DEPARTURE: 555 syslog(LOG_NOTICE, 556 "interface removed (idx=%d)", 557 ifan->ifan_index); 558 rm_ifinfo_index(ifan->ifan_index); 559 560 /* Clear ifi_ifindex */ 561 TAILQ_FOREACH(ifi, &ifilist, ifi_next) { 562 if (ifi->ifi_ifindex 563 == ifan->ifan_index) { 564 ifi->ifi_ifindex = 0; 565 break; 566 } 567 } 568 update_ifinfo(&ifilist, ifan->ifan_index); 569 break; 570 } 571 continue; 572 default: 573 /* should not reach here */ 574 syslog(LOG_DEBUG, 575 "<%s:%d> unknown rtmsg %d on %s", 576 __func__, __LINE__, type, 577 if_indextoname(ifindex, ifname)); 578 continue; 579 } 580 ifi = if_indextoifinfo(ifindex); 581 if (ifi == NULL) { 582 syslog(LOG_DEBUG, 583 "<%s> ifinfo not found for idx=%d. Why?", 584 __func__, ifindex); 585 continue; 586 } 587 rai = ifi->ifi_rainfo; 588 if (rai == NULL) { 589 syslog(LOG_DEBUG, 590 "<%s> route changed on " 591 "non advertising interface(%s)", 592 __func__, ifi->ifi_ifname); 593 continue; 594 } 595 596 oldifflags = ifi->ifi_flags; 597 /* init ifflags because it may have changed */ 598 update_ifinfo(&ifilist, ifindex); 599 600 switch (type) { 601 case RTM_ADD: 602 if (sflag) 603 break; /* we aren't interested in prefixes */ 604 605 addr = get_addr(msg); 606 plen = get_prefixlen(msg); 607 /* sanity check for plen */ 608 /* as RFC2373, prefixlen is at least 4 */ 609 if (plen < 4 || plen > 127) { 610 syslog(LOG_INFO, "<%s> new interface route's" 611 "plen %d is invalid for a prefix", 612 __func__, plen); 613 break; 614 } 615 pfx = find_prefix(rai, addr, plen); 616 if (pfx) { 617 if (pfx->pfx_timer) { 618 /* 619 * If the prefix has been invalidated, 620 * make it available again. 621 */ 622 update_prefix(pfx); 623 prefixchange = 1; 624 } else 625 syslog(LOG_DEBUG, 626 "<%s> new prefix(%s/%d) " 627 "added on %s, " 628 "but it was already in list", 629 __func__, 630 inet_ntop(AF_INET6, addr, 631 (char *)addrbuf, 632 sizeof(addrbuf)), 633 plen, ifi->ifi_ifname); 634 break; 635 } 636 make_prefix(rai, ifindex, addr, plen); 637 prefixchange = 1; 638 break; 639 case RTM_DELETE: 640 if (sflag) 641 break; 642 643 addr = get_addr(msg); 644 plen = get_prefixlen(msg); 645 /* sanity check for plen */ 646 /* as RFC2373, prefixlen is at least 4 */ 647 if (plen < 4 || plen > 127) { 648 syslog(LOG_INFO, 649 "<%s> deleted interface route's " 650 "plen %d is invalid for a prefix", 651 __func__, plen); 652 break; 653 } 654 pfx = find_prefix(rai, addr, plen); 655 if (pfx == NULL) { 656 syslog(LOG_DEBUG, 657 "<%s> prefix(%s/%d) was deleted on %s, " 658 "but it was not in list", 659 __func__, inet_ntop(AF_INET6, addr, 660 (char *)addrbuf, sizeof(addrbuf)), 661 plen, ifi->ifi_ifname); 662 break; 663 } 664 invalidate_prefix(pfx); 665 prefixchange = 1; 666 break; 667 case RTM_NEWADDR: 668 case RTM_DELADDR: 669 case RTM_IFINFO: 670 break; 671 default: 672 /* should not reach here */ 673 syslog(LOG_DEBUG, 674 "<%s:%d> unknown rtmsg %d on %s", 675 __func__, __LINE__, type, 676 if_indextoname(ifindex, ifname)); 677 return; 678 } 679 680 /* check if an interface flag is changed */ 681 if ((oldifflags & IFF_UP) && /* UP to DOWN */ 682 !(ifi->ifi_flags & IFF_UP)) { 683 syslog(LOG_NOTICE, 684 "<interface %s becomes down. stop timer.", 685 ifi->ifi_ifname); 686 rtadvd_remove_timer(ifi->ifi_ra_timer); 687 ifi->ifi_ra_timer = NULL; 688 } else if (!(oldifflags & IFF_UP) && /* DOWN to UP */ 689 (ifi->ifi_flags & IFF_UP)) { 690 syslog(LOG_NOTICE, 691 "interface %s becomes up. restart timer.", 692 ifi->ifi_ifname); 693 694 ifi->ifi_state = IFI_STATE_TRANSITIVE; 695 ifi->ifi_burstcount = 696 MAX_INITIAL_RTR_ADVERTISEMENTS; 697 ifi->ifi_burstinterval = 698 MAX_INITIAL_RTR_ADVERT_INTERVAL; 699 700 ifi->ifi_ra_timer = rtadvd_add_timer(ra_timeout, 701 ra_timer_update, ifi, ifi); 702 ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm); 703 rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm, 704 ifi->ifi_ra_timer); 705 } else if (prefixchange && 706 (ifi->ifi_flags & IFF_UP)) { 707 /* 708 * An advertised prefix has been added or invalidated. 709 * Will notice the change in a short delay. 710 */ 711 set_short_delay(ifi); 712 } 713 } 714 } 715 716 void 717 rtadvd_input(struct sockinfo *s) 718 { 719 ssize_t i; 720 int *hlimp = NULL; 721 #ifdef OLDRAWSOCKET 722 struct ip6_hdr *ip; 723 #endif 724 struct icmp6_hdr *icp; 725 int ifindex = 0; 726 struct cmsghdr *cm; 727 struct in6_pktinfo *pi = NULL; 728 char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ]; 729 struct in6_addr dst = in6addr_any; 730 struct ifinfo *ifi; 731 732 syslog(LOG_DEBUG, "<%s> enter", __func__); 733 734 if (s == NULL) { 735 syslog(LOG_ERR, "<%s> internal error", __func__); 736 exit(1); 737 } 738 /* 739 * Get message. We reset msg_controllen since the field could 740 * be modified if we had received a message before setting 741 * receive options. 742 */ 743 rcvmhdr.msg_controllen = rcvcmsgbuflen; 744 if ((i = recvmsg(s->si_fd, &rcvmhdr, 0)) < 0) 745 return; 746 747 /* extract optional information via Advanced API */ 748 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&rcvmhdr); 749 cm; 750 cm = (struct cmsghdr *)CMSG_NXTHDR(&rcvmhdr, cm)) { 751 if (cm->cmsg_level == IPPROTO_IPV6 && 752 cm->cmsg_type == IPV6_PKTINFO && 753 cm->cmsg_len == CMSG_LEN(sizeof(struct in6_pktinfo))) { 754 pi = (struct in6_pktinfo *)(CMSG_DATA(cm)); 755 ifindex = pi->ipi6_ifindex; 756 dst = pi->ipi6_addr; 757 } 758 if (cm->cmsg_level == IPPROTO_IPV6 && 759 cm->cmsg_type == IPV6_HOPLIMIT && 760 cm->cmsg_len == CMSG_LEN(sizeof(int))) 761 hlimp = (int *)CMSG_DATA(cm); 762 } 763 if (ifindex == 0) { 764 syslog(LOG_ERR, "failed to get receiving interface"); 765 return; 766 } 767 if (hlimp == NULL) { 768 syslog(LOG_ERR, "failed to get receiving hop limit"); 769 return; 770 } 771 772 /* 773 * If we happen to receive data on an interface which is now gone 774 * or down, just discard the data. 775 */ 776 ifi = if_indextoifinfo(pi->ipi6_ifindex); 777 if (ifi == NULL || !(ifi->ifi_flags & IFF_UP)) { 778 syslog(LOG_INFO, 779 "<%s> received data on a disabled interface (%s)", 780 __func__, 781 (ifi == NULL) ? "[gone]" : ifi->ifi_ifname); 782 return; 783 } 784 785 #ifdef OLDRAWSOCKET 786 if ((size_t)i < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr)) { 787 syslog(LOG_ERR, 788 "packet size(%d) is too short", i); 789 return; 790 } 791 792 ip = (struct ip6_hdr *)rcvmhdr.msg_iov[0].iov_base; 793 icp = (struct icmp6_hdr *)(ip + 1); /* XXX: ext. hdr? */ 794 #else 795 if ((size_t)i < sizeof(struct icmp6_hdr)) { 796 syslog(LOG_ERR, "packet size(%zd) is too short", i); 797 return; 798 } 799 800 icp = (struct icmp6_hdr *)rcvmhdr.msg_iov[0].iov_base; 801 #endif 802 803 switch (icp->icmp6_type) { 804 case ND_ROUTER_SOLICIT: 805 /* 806 * Message verification - RFC 4861 6.1.1 807 * XXX: these checks must be done in the kernel as well, 808 * but we can't completely rely on them. 809 */ 810 if (*hlimp != 255) { 811 syslog(LOG_NOTICE, 812 "RS with invalid hop limit(%d) " 813 "received from %s on %s", 814 *hlimp, 815 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf, 816 sizeof(ntopbuf)), 817 if_indextoname(pi->ipi6_ifindex, ifnamebuf)); 818 return; 819 } 820 if (icp->icmp6_code) { 821 syslog(LOG_NOTICE, 822 "RS with invalid ICMP6 code(%d) " 823 "received from %s on %s", 824 icp->icmp6_code, 825 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf, 826 sizeof(ntopbuf)), 827 if_indextoname(pi->ipi6_ifindex, ifnamebuf)); 828 return; 829 } 830 if ((size_t)i < sizeof(struct nd_router_solicit)) { 831 syslog(LOG_NOTICE, 832 "RS from %s on %s does not have enough " 833 "length (len = %zd)", 834 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf, 835 sizeof(ntopbuf)), 836 if_indextoname(pi->ipi6_ifindex, ifnamebuf), i); 837 return; 838 } 839 rs_input(i, (struct nd_router_solicit *)icp, pi, &rcvfrom); 840 break; 841 case ND_ROUTER_ADVERT: 842 /* 843 * Message verification - RFC 4861 6.1.2 844 * XXX: there's the same dilemma as above... 845 */ 846 if (!IN6_IS_ADDR_LINKLOCAL(&rcvfrom.sin6_addr)) { 847 syslog(LOG_NOTICE, 848 "RA with non-linklocal source address " 849 "received from %s on %s", 850 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, 851 ntopbuf, sizeof(ntopbuf)), 852 if_indextoname(pi->ipi6_ifindex, ifnamebuf)); 853 return; 854 } 855 if (*hlimp != 255) { 856 syslog(LOG_NOTICE, 857 "RA with invalid hop limit(%d) " 858 "received from %s on %s", 859 *hlimp, 860 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf, 861 sizeof(ntopbuf)), 862 if_indextoname(pi->ipi6_ifindex, ifnamebuf)); 863 return; 864 } 865 if (icp->icmp6_code) { 866 syslog(LOG_NOTICE, 867 "RA with invalid ICMP6 code(%d) " 868 "received from %s on %s", 869 icp->icmp6_code, 870 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf, 871 sizeof(ntopbuf)), 872 if_indextoname(pi->ipi6_ifindex, ifnamebuf)); 873 return; 874 } 875 if ((size_t)i < sizeof(struct nd_router_advert)) { 876 syslog(LOG_NOTICE, 877 "RA from %s on %s does not have enough " 878 "length (len = %zd)", 879 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf, 880 sizeof(ntopbuf)), 881 if_indextoname(pi->ipi6_ifindex, ifnamebuf), i); 882 return; 883 } 884 ra_input(i, (struct nd_router_advert *)icp, pi, &rcvfrom); 885 break; 886 case ICMP6_ROUTER_RENUMBERING: 887 if (mcastif == NULL) { 888 syslog(LOG_ERR, "received a router renumbering " 889 "message, but not allowed to be accepted"); 890 break; 891 } 892 rr_input(i, (struct icmp6_router_renum *)icp, pi, &rcvfrom, 893 &dst); 894 break; 895 default: 896 /* 897 * Note that this case is POSSIBLE, especially just 898 * after invocation of the daemon. This is because we 899 * could receive message after opening the socket and 900 * before setting ICMP6 type filter(see sock_open()). 901 */ 902 syslog(LOG_ERR, "invalid icmp type(%d)", icp->icmp6_type); 903 return; 904 } 905 } 906 907 static void 908 rs_input(int len, struct nd_router_solicit *rs, 909 struct in6_pktinfo *pi, struct sockaddr_in6 *from) 910 { 911 char ntopbuf[INET6_ADDRSTRLEN]; 912 char ifnamebuf[IFNAMSIZ]; 913 union nd_opt ndopts; 914 struct rainfo *rai; 915 struct ifinfo *ifi; 916 struct soliciter *sol; 917 918 syslog(LOG_DEBUG, 919 "<%s> RS received from %s on %s", 920 __func__, 921 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), 922 if_indextoname(pi->ipi6_ifindex, ifnamebuf)); 923 924 /* ND option check */ 925 memset(&ndopts, 0, sizeof(ndopts)); 926 TAILQ_INIT(&ndopts.opt_list); 927 if (nd6_options((struct nd_opt_hdr *)(rs + 1), 928 len - sizeof(struct nd_router_solicit), 929 &ndopts, NDOPT_FLAG_SRCLINKADDR)) { 930 syslog(LOG_INFO, 931 "<%s> ND option check failed for an RS from %s on %s", 932 __func__, 933 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 934 sizeof(ntopbuf)), 935 if_indextoname(pi->ipi6_ifindex, ifnamebuf)); 936 return; 937 } 938 939 /* 940 * If the IP source address is the unspecified address, there 941 * must be no source link-layer address option in the message. 942 * (RFC 4861 6.1.1) 943 */ 944 if (IN6_IS_ADDR_UNSPECIFIED(&from->sin6_addr) && 945 ndopts.opt_src_lladdr) { 946 syslog(LOG_INFO, 947 "<%s> RS from unspecified src on %s has a link-layer" 948 " address option", 949 __func__, if_indextoname(pi->ipi6_ifindex, ifnamebuf)); 950 goto done; 951 } 952 953 ifi = if_indextoifinfo(pi->ipi6_ifindex); 954 if (ifi == NULL) { 955 syslog(LOG_INFO, 956 "<%s> if (idx=%d) not found. Why?", 957 __func__, pi->ipi6_ifindex); 958 goto done; 959 } 960 rai = ifi->ifi_rainfo; 961 if (rai == NULL) { 962 syslog(LOG_INFO, 963 "<%s> RS received on non advertising interface(%s)", 964 __func__, 965 if_indextoname(pi->ipi6_ifindex, ifnamebuf)); 966 goto done; 967 } 968 969 rai->rai_ifinfo->ifi_rsinput++; 970 971 /* 972 * Decide whether to send RA according to the rate-limit 973 * consideration. 974 */ 975 976 /* record sockaddr waiting for RA, if possible */ 977 sol = (struct soliciter *)malloc(sizeof(*sol)); 978 if (sol) { 979 sol->sol_addr = *from; 980 /* XXX RFC 2553 need clarification on flowinfo */ 981 sol->sol_addr.sin6_flowinfo = 0; 982 TAILQ_INSERT_TAIL(&rai->rai_soliciter, sol, sol_next); 983 } 984 985 /* 986 * If there is already a waiting RS packet, don't 987 * update the timer. 988 */ 989 if (ifi->ifi_rs_waitcount++) 990 goto done; 991 992 set_short_delay(ifi); 993 994 done: 995 free_ndopts(&ndopts); 996 } 997 998 static void 999 set_short_delay(struct ifinfo *ifi) 1000 { 1001 long delay; /* must not be greater than 1000000 */ 1002 struct timespec interval, now, min_delay, tm_tmp, *rest; 1003 1004 if (ifi->ifi_ra_timer == NULL) 1005 return; 1006 /* 1007 * Compute a random delay. If the computed value 1008 * corresponds to a time later than the time the next 1009 * multicast RA is scheduled to be sent, ignore the random 1010 * delay and send the advertisement at the 1011 * already-scheduled time. RFC 4861 6.2.6 1012 */ 1013 delay = arc4random_uniform(MAX_RA_DELAY_TIME); 1014 interval.tv_sec = 0; 1015 interval.tv_nsec = delay * 1000; 1016 rest = rtadvd_timer_rest(ifi->ifi_ra_timer); 1017 if (TS_CMP(rest, &interval, <)) { 1018 syslog(LOG_DEBUG, "<%s> random delay is larger than " 1019 "the rest of the current timer", __func__); 1020 interval = *rest; 1021 } 1022 1023 /* 1024 * If we sent a multicast Router Advertisement within 1025 * the last MIN_DELAY_BETWEEN_RAS seconds, schedule 1026 * the advertisement to be sent at a time corresponding to 1027 * MIN_DELAY_BETWEEN_RAS plus the random value after the 1028 * previous advertisement was sent. 1029 */ 1030 clock_gettime(CLOCK_MONOTONIC_FAST, &now); 1031 TS_SUB(&now, &ifi->ifi_ra_lastsent, &tm_tmp); 1032 min_delay.tv_sec = MIN_DELAY_BETWEEN_RAS; 1033 min_delay.tv_nsec = 0; 1034 if (TS_CMP(&tm_tmp, &min_delay, <)) { 1035 TS_SUB(&min_delay, &tm_tmp, &min_delay); 1036 TS_ADD(&min_delay, &interval, &interval); 1037 } 1038 rtadvd_set_timer(&interval, ifi->ifi_ra_timer); 1039 } 1040 1041 static int 1042 check_accept_rtadv(int idx) 1043 { 1044 struct ifinfo *ifi; 1045 1046 TAILQ_FOREACH(ifi, &ifilist, ifi_next) { 1047 if (ifi->ifi_ifindex == idx) 1048 break; 1049 } 1050 if (ifi == NULL) { 1051 syslog(LOG_DEBUG, 1052 "<%s> if (idx=%d) not found. Why?", 1053 __func__, idx); 1054 return (0); 1055 } 1056 1057 /* 1058 * RA_RECV: ND6_IFF_ACCEPT_RTADV 1059 * RA_SEND: ip6.forwarding 1060 */ 1061 if (update_ifinfo_nd_flags(ifi) != 0) { 1062 syslog(LOG_ERR, "cannot get nd6 flags (idx=%d)", idx); 1063 return (0); 1064 } 1065 1066 return (ifi->ifi_nd_flags & ND6_IFF_ACCEPT_RTADV); 1067 } 1068 1069 static void 1070 ra_input(int len, struct nd_router_advert *nra, 1071 struct in6_pktinfo *pi, struct sockaddr_in6 *from) 1072 { 1073 struct rainfo *rai; 1074 struct ifinfo *ifi; 1075 char ntopbuf[INET6_ADDRSTRLEN]; 1076 char ifnamebuf[IFNAMSIZ]; 1077 union nd_opt ndopts; 1078 const char *on_off[] = {"OFF", "ON"}; 1079 uint32_t reachabletime, retranstimer, mtu; 1080 int inconsistent = 0; 1081 int error; 1082 1083 syslog(LOG_DEBUG, "<%s> RA received from %s on %s", __func__, 1084 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, sizeof(ntopbuf)), 1085 if_indextoname(pi->ipi6_ifindex, ifnamebuf)); 1086 1087 /* ND option check */ 1088 memset(&ndopts, 0, sizeof(ndopts)); 1089 TAILQ_INIT(&ndopts.opt_list); 1090 error = nd6_options((struct nd_opt_hdr *)(nra + 1), 1091 len - sizeof(struct nd_router_advert), &ndopts, 1092 NDOPT_FLAG_SRCLINKADDR | NDOPT_FLAG_PREFIXINFO | NDOPT_FLAG_MTU | 1093 NDOPT_FLAG_RDNSS | NDOPT_FLAG_DNSSL | NDOPT_FLAG_PREF64 | 1094 NDOPT_FLAG_ROUTEINFO); 1095 if (error) { 1096 syslog(LOG_INFO, 1097 "<%s> ND option check failed for an RA from %s on %s", 1098 __func__, 1099 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1100 sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex, 1101 ifnamebuf)); 1102 return; 1103 } 1104 1105 /* 1106 * RA consistency check according to RFC 4861 6.2.7 1107 */ 1108 ifi = if_indextoifinfo(pi->ipi6_ifindex); 1109 if (ifi->ifi_rainfo == NULL) { 1110 syslog(LOG_INFO, 1111 "<%s> received RA from %s on non-advertising" 1112 " interface(%s)", 1113 __func__, 1114 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1115 sizeof(ntopbuf)), if_indextoname(pi->ipi6_ifindex, 1116 ifnamebuf)); 1117 goto done; 1118 } 1119 rai = ifi->ifi_rainfo; 1120 ifi->ifi_rainput++; 1121 syslog(LOG_DEBUG, "<%s> ifi->ifi_rainput = %" PRIu64, __func__, 1122 ifi->ifi_rainput); 1123 1124 /* Cur Hop Limit value */ 1125 if (nra->nd_ra_curhoplimit && rai->rai_hoplimit && 1126 nra->nd_ra_curhoplimit != rai->rai_hoplimit) { 1127 syslog(LOG_NOTICE, 1128 "CurHopLimit inconsistent on %s:" 1129 " %d from %s, %d from us", 1130 ifi->ifi_ifname, nra->nd_ra_curhoplimit, 1131 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1132 sizeof(ntopbuf)), rai->rai_hoplimit); 1133 inconsistent++; 1134 } 1135 /* M flag */ 1136 if ((nra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED) != 1137 rai->rai_managedflg) { 1138 syslog(LOG_NOTICE, 1139 "M flag inconsistent on %s:" 1140 " %s from %s, %s from us", 1141 ifi->ifi_ifname, on_off[!rai->rai_managedflg], 1142 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1143 sizeof(ntopbuf)), on_off[rai->rai_managedflg]); 1144 inconsistent++; 1145 } 1146 /* O flag */ 1147 if ((nra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER) != 1148 rai->rai_otherflg) { 1149 syslog(LOG_NOTICE, 1150 "O flag inconsistent on %s:" 1151 " %s from %s, %s from us", 1152 ifi->ifi_ifname, on_off[!rai->rai_otherflg], 1153 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1154 sizeof(ntopbuf)), on_off[rai->rai_otherflg]); 1155 inconsistent++; 1156 } 1157 /* Reachable Time */ 1158 reachabletime = ntohl(nra->nd_ra_reachable); 1159 if (reachabletime && rai->rai_reachabletime && 1160 reachabletime != rai->rai_reachabletime) { 1161 syslog(LOG_NOTICE, 1162 "ReachableTime inconsistent on %s:" 1163 " %d from %s, %d from us", 1164 ifi->ifi_ifname, reachabletime, 1165 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1166 sizeof(ntopbuf)), rai->rai_reachabletime); 1167 inconsistent++; 1168 } 1169 /* Retrans Timer */ 1170 retranstimer = ntohl(nra->nd_ra_retransmit); 1171 if (retranstimer && rai->rai_retranstimer && 1172 retranstimer != rai->rai_retranstimer) { 1173 syslog(LOG_NOTICE, 1174 "RetranceTimer inconsistent on %s:" 1175 " %d from %s, %d from us", 1176 ifi->ifi_ifname, retranstimer, 1177 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1178 sizeof(ntopbuf)), rai->rai_retranstimer); 1179 inconsistent++; 1180 } 1181 /* Values in the MTU options */ 1182 if (ndopts.opt_mtu) { 1183 mtu = ntohl(ndopts.opt_mtu->nd_opt_mtu_mtu); 1184 if (mtu && rai->rai_linkmtu && mtu != rai->rai_linkmtu) { 1185 syslog(LOG_NOTICE, 1186 "MTU option value inconsistent on %s:" 1187 " %d from %s, %d from us", 1188 ifi->ifi_ifname, mtu, 1189 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1190 sizeof(ntopbuf)), rai->rai_linkmtu); 1191 inconsistent++; 1192 } 1193 } 1194 /* Preferred and Valid Lifetimes for prefixes */ 1195 { 1196 struct nd_optlist *nol; 1197 1198 if (ndopts.opt_pi) 1199 if (prefix_check(ndopts.opt_pi, rai, from)) 1200 inconsistent++; 1201 1202 TAILQ_FOREACH(nol, &ndopts.opt_list, nol_next) 1203 if (prefix_check((struct nd_opt_prefix_info *)nol->nol_opt, 1204 rai, from)) 1205 inconsistent++; 1206 } 1207 1208 if (inconsistent) 1209 ifi->ifi_rainconsistent++; 1210 1211 done: 1212 free_ndopts(&ndopts); 1213 } 1214 1215 static uint32_t 1216 udiff(uint32_t u, uint32_t v) 1217 { 1218 return (u >= v ? u - v : v - u); 1219 } 1220 1221 /* return a non-zero value if the received prefix is inconsistent with ours */ 1222 static int 1223 prefix_check(struct nd_opt_prefix_info *pinfo, 1224 struct rainfo *rai, struct sockaddr_in6 *from) 1225 { 1226 struct ifinfo *ifi; 1227 uint32_t preferred_time, valid_time; 1228 struct prefix *pfx; 1229 int inconsistent = 0; 1230 char ntopbuf[INET6_ADDRSTRLEN]; 1231 char prefixbuf[INET6_ADDRSTRLEN]; 1232 struct timespec now; 1233 1234 #if 0 /* impossible */ 1235 if (pinfo->nd_opt_pi_type != ND_OPT_PREFIX_INFORMATION) 1236 return (0); 1237 #endif 1238 ifi = rai->rai_ifinfo; 1239 /* 1240 * log if the adveritsed prefix has link-local scope(sanity check?) 1241 */ 1242 if (IN6_IS_ADDR_LINKLOCAL(&pinfo->nd_opt_pi_prefix)) 1243 syslog(LOG_INFO, 1244 "<%s> link-local prefix %s/%d is advertised " 1245 "from %s on %s", 1246 __func__, 1247 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf, 1248 sizeof(prefixbuf)), 1249 pinfo->nd_opt_pi_prefix_len, 1250 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1251 sizeof(ntopbuf)), ifi->ifi_ifname); 1252 1253 if ((pfx = find_prefix(rai, &pinfo->nd_opt_pi_prefix, 1254 pinfo->nd_opt_pi_prefix_len)) == NULL) { 1255 syslog(LOG_INFO, 1256 "<%s> prefix %s/%d from %s on %s is not in our list", 1257 __func__, 1258 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf, 1259 sizeof(prefixbuf)), 1260 pinfo->nd_opt_pi_prefix_len, 1261 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1262 sizeof(ntopbuf)), ifi->ifi_ifname); 1263 return (0); 1264 } 1265 1266 preferred_time = ntohl(pinfo->nd_opt_pi_preferred_time); 1267 if (pfx->pfx_pltimeexpire) { 1268 /* 1269 * The lifetime is decremented in real time, so we should 1270 * compare the expiration time. 1271 * (RFC 2461 Section 6.2.7.) 1272 * XXX: can we really expect that all routers on the link 1273 * have synchronized clocks? 1274 */ 1275 clock_gettime(CLOCK_MONOTONIC_FAST, &now); 1276 preferred_time += now.tv_sec; 1277 1278 if (!pfx->pfx_timer && rai->rai_clockskew && 1279 udiff(preferred_time, pfx->pfx_pltimeexpire) > rai->rai_clockskew) { 1280 syslog(LOG_INFO, 1281 "<%s> preferred lifetime for %s/%d" 1282 " (decr. in real time) inconsistent on %s:" 1283 " %" PRIu32 " from %s, %" PRIu32 " from us", 1284 __func__, 1285 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf, 1286 sizeof(prefixbuf)), 1287 pinfo->nd_opt_pi_prefix_len, 1288 ifi->ifi_ifname, preferred_time, 1289 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1290 sizeof(ntopbuf)), pfx->pfx_pltimeexpire); 1291 inconsistent++; 1292 } 1293 } else if (!pfx->pfx_timer && preferred_time != pfx->pfx_preflifetime) 1294 syslog(LOG_INFO, 1295 "<%s> preferred lifetime for %s/%d" 1296 " inconsistent on %s:" 1297 " %d from %s, %d from us", 1298 __func__, 1299 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf, 1300 sizeof(prefixbuf)), 1301 pinfo->nd_opt_pi_prefix_len, 1302 ifi->ifi_ifname, preferred_time, 1303 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1304 sizeof(ntopbuf)), pfx->pfx_preflifetime); 1305 1306 valid_time = ntohl(pinfo->nd_opt_pi_valid_time); 1307 if (pfx->pfx_vltimeexpire) { 1308 clock_gettime(CLOCK_MONOTONIC_FAST, &now); 1309 valid_time += now.tv_sec; 1310 1311 if (!pfx->pfx_timer && rai->rai_clockskew && 1312 udiff(valid_time, pfx->pfx_vltimeexpire) > rai->rai_clockskew) { 1313 syslog(LOG_INFO, 1314 "<%s> valid lifetime for %s/%d" 1315 " (decr. in real time) inconsistent on %s:" 1316 " %d from %s, %" PRIu32 " from us", 1317 __func__, 1318 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf, 1319 sizeof(prefixbuf)), 1320 pinfo->nd_opt_pi_prefix_len, 1321 ifi->ifi_ifname, preferred_time, 1322 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1323 sizeof(ntopbuf)), pfx->pfx_vltimeexpire); 1324 inconsistent++; 1325 } 1326 } else if (!pfx->pfx_timer && valid_time != pfx->pfx_validlifetime) { 1327 syslog(LOG_INFO, 1328 "<%s> valid lifetime for %s/%d" 1329 " inconsistent on %s:" 1330 " %d from %s, %d from us", 1331 __func__, 1332 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix, prefixbuf, 1333 sizeof(prefixbuf)), 1334 pinfo->nd_opt_pi_prefix_len, 1335 ifi->ifi_ifname, valid_time, 1336 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf, 1337 sizeof(ntopbuf)), pfx->pfx_validlifetime); 1338 inconsistent++; 1339 } 1340 1341 return (inconsistent); 1342 } 1343 1344 struct prefix * 1345 find_prefix(struct rainfo *rai, struct in6_addr *prefix, int plen) 1346 { 1347 struct prefix *pfx; 1348 int bytelen, bitlen; 1349 char bitmask; 1350 1351 TAILQ_FOREACH(pfx, &rai->rai_prefix, pfx_next) { 1352 if (plen != pfx->pfx_prefixlen) 1353 continue; 1354 1355 bytelen = plen / 8; 1356 bitlen = plen % 8; 1357 bitmask = 0xff << (8 - bitlen); 1358 1359 if (memcmp((void *)prefix, (void *)&pfx->pfx_prefix, bytelen)) 1360 continue; 1361 1362 if (bitlen == 0 || 1363 ((prefix->s6_addr[bytelen] & bitmask) == 1364 (pfx->pfx_prefix.s6_addr[bytelen] & bitmask))) { 1365 return (pfx); 1366 } 1367 } 1368 1369 return (NULL); 1370 } 1371 1372 /* check if p0/plen0 matches p1/plen1; return 1 if matches, otherwise 0. */ 1373 int 1374 prefix_match(struct in6_addr *p0, int plen0, 1375 struct in6_addr *p1, int plen1) 1376 { 1377 int bytelen, bitlen; 1378 char bitmask; 1379 1380 if (plen0 < plen1) 1381 return (0); 1382 1383 bytelen = plen1 / 8; 1384 bitlen = plen1 % 8; 1385 bitmask = 0xff << (8 - bitlen); 1386 1387 if (memcmp((void *)p0, (void *)p1, bytelen)) 1388 return (0); 1389 1390 if (bitlen == 0 || 1391 ((p0->s6_addr[bytelen] & bitmask) == 1392 (p1->s6_addr[bytelen] & bitmask))) { 1393 return (1); 1394 } 1395 1396 return (0); 1397 } 1398 1399 static int 1400 nd6_options(struct nd_opt_hdr *hdr, int limit, 1401 union nd_opt *ndopts, uint32_t optflags) 1402 { 1403 int optlen = 0; 1404 1405 for (; limit > 0; limit -= optlen) { 1406 if ((size_t)limit < sizeof(struct nd_opt_hdr)) { 1407 syslog(LOG_INFO, "<%s> short option header", __func__); 1408 goto bad; 1409 } 1410 1411 hdr = (struct nd_opt_hdr *)((caddr_t)hdr + optlen); 1412 if (hdr->nd_opt_len == 0) { 1413 syslog(LOG_INFO, 1414 "<%s> bad ND option length(0) (type = %d)", 1415 __func__, hdr->nd_opt_type); 1416 goto bad; 1417 } 1418 optlen = hdr->nd_opt_len << 3; 1419 if (optlen > limit) { 1420 syslog(LOG_INFO, "<%s> short option", __func__); 1421 goto bad; 1422 } 1423 1424 if (hdr->nd_opt_type > ND_OPT_MTU && 1425 hdr->nd_opt_type != ND_OPT_RDNSS && 1426 hdr->nd_opt_type != ND_OPT_DNSSL && 1427 hdr->nd_opt_type != ND_OPT_PREF64 && 1428 hdr->nd_opt_type != ND_OPT_ROUTE_INFO) { 1429 syslog(LOG_INFO, "<%s> unknown ND option(type %d)", 1430 __func__, hdr->nd_opt_type); 1431 continue; 1432 } 1433 1434 if ((ndopt_flags[hdr->nd_opt_type] & optflags) == 0) { 1435 syslog(LOG_INFO, "<%s> unexpected ND option(type %d)", 1436 __func__, hdr->nd_opt_type); 1437 continue; 1438 } 1439 1440 /* 1441 * Option length check. Do it here for all fixed-length 1442 * options. 1443 */ 1444 switch (hdr->nd_opt_type) { 1445 case ND_OPT_MTU: 1446 if (optlen == sizeof(struct nd_opt_mtu)) 1447 break; 1448 goto skip; 1449 case ND_OPT_RDNSS: 1450 if (optlen >= 24 && 1451 (optlen - sizeof(struct nd_opt_rdnss)) % 16 == 0) 1452 break; 1453 goto skip; 1454 case ND_OPT_DNSSL: 1455 if (optlen >= 16 && 1456 (optlen - sizeof(struct nd_opt_dnssl)) % 8 == 0) 1457 break; 1458 goto skip; 1459 case ND_OPT_PREFIX_INFORMATION: 1460 if (optlen == sizeof(struct nd_opt_prefix_info)) 1461 break; 1462 goto skip; 1463 case ND_OPT_ROUTE_INFO: 1464 if (optlen >= 8 && optlen <= 24 && 1465 (optlen - sizeof(struct nd_opt_route_info)) % 8 == 0) 1466 break; 1467 skip: 1468 syslog(LOG_INFO, "<%s> invalid option length", 1469 __func__); 1470 continue; 1471 } 1472 1473 switch (hdr->nd_opt_type) { 1474 case ND_OPT_TARGET_LINKADDR: 1475 case ND_OPT_REDIRECTED_HEADER: 1476 case ND_OPT_RDNSS: 1477 case ND_OPT_DNSSL: 1478 case ND_OPT_PREF64: 1479 case ND_OPT_ROUTE_INFO: 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