1 /* $KAME: if.c,v 1.17 2001/01/21 15:27:30 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/socket.h> 37 #include <sys/sysctl.h> 38 #include <sys/ioctl.h> 39 #include <net/if.h> 40 #include <net/if_dl.h> 41 #include <net/if_types.h> 42 #include <net/ethernet.h> 43 #include <net/route.h> 44 #include <netinet/in.h> 45 #include <netinet/in_var.h> 46 #include <netinet/ip6.h> 47 #include <netinet/icmp6.h> 48 #include <netinet6/nd6.h> 49 #include <unistd.h> 50 #include <errno.h> 51 #include <netdb.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <syslog.h> 55 56 #include "pathnames.h" 57 #include "rtadvd.h" 58 #include "if.h" 59 60 #define ROUNDUP(a, size) \ 61 (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a)) 62 63 #define NEXT_SA(ap) \ 64 (ap) = (struct sockaddr *)((caddr_t)(ap) + \ 65 ((ap)->sa_len ? ROUNDUP((ap)->sa_len, sizeof(u_long)) : \ 66 sizeof(u_long))) 67 68 struct sockaddr_in6 sin6_linklocal_allnodes = { 69 .sin6_len = sizeof(sin6_linklocal_allnodes), 70 .sin6_family = AF_INET6, 71 .sin6_addr = IN6ADDR_LINKLOCAL_ALLNODES_INIT, 72 }; 73 74 struct sockaddr_in6 sin6_linklocal_allrouters = { 75 .sin6_len = sizeof(sin6_linklocal_allrouters), 76 .sin6_family = AF_INET6, 77 .sin6_addr = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT, 78 }; 79 80 struct sockaddr_in6 sin6_sitelocal_allrouters = { 81 .sin6_len = sizeof(sin6_sitelocal_allrouters), 82 .sin6_family = AF_INET6, 83 .sin6_addr = IN6ADDR_SITELOCAL_ALLROUTERS_INIT, 84 }; 85 86 struct sockinfo sock = { .si_fd = -1, .si_name = NULL }; 87 struct sockinfo rtsock = { .si_fd = -1, .si_name = NULL }; 88 struct sockinfo ctrlsock = { .si_fd = -1, .si_name = _PATH_CTRL_SOCK }; 89 90 char *mcastif; 91 92 static void get_rtaddrs(int, struct sockaddr *, 93 struct sockaddr **); 94 static struct if_msghdr *get_next_msghdr(struct if_msghdr *, 95 struct if_msghdr *); 96 97 static void 98 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info) 99 { 100 int i; 101 102 for (i = 0; i < RTAX_MAX; i++) { 103 if (addrs & (1 << i)) { 104 rti_info[i] = sa; 105 NEXT_SA(sa); 106 } 107 else 108 rti_info[i] = NULL; 109 } 110 } 111 112 #define ROUNDUP8(a) (1 + (((a) - 1) | 7)) 113 int 114 lladdropt_length(struct sockaddr_dl *sdl) 115 { 116 switch (sdl->sdl_type) { 117 case IFT_ETHER: 118 case IFT_L2VLAN: 119 case IFT_BRIDGE: 120 return (ROUNDUP8(ETHER_ADDR_LEN + 2)); 121 default: 122 return (0); 123 } 124 } 125 126 void 127 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt) 128 { 129 char *addr; 130 131 ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */ 132 133 switch (sdl->sdl_type) { 134 case IFT_ETHER: 135 case IFT_L2VLAN: 136 case IFT_BRIDGE: 137 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3; 138 addr = (char *)(ndopt + 1); 139 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN); 140 break; 141 default: 142 syslog(LOG_ERR, "<%s> unsupported link type(%d)", 143 __func__, sdl->sdl_type); 144 exit(1); 145 } 146 147 return; 148 } 149 150 int 151 rtbuf_len(void) 152 { 153 size_t len; 154 int mib[6] = {CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0}; 155 156 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) 157 return (-1); 158 159 return (len); 160 } 161 162 #define FILTER_MATCH(type, filter) ((0x1 << type) & filter) 163 #define SIN6(s) ((struct sockaddr_in6 *)(s)) 164 #define SDL(s) ((struct sockaddr_dl *)(s)) 165 char * 166 get_next_msg(char *buf, char *lim, int ifindex, size_t *lenp, int filter) 167 { 168 struct rt_msghdr *rtm; 169 struct ifa_msghdr *ifam; 170 struct sockaddr *sa, *dst, *gw, *ifa, *rti_info[RTAX_MAX]; 171 172 *lenp = 0; 173 for (rtm = (struct rt_msghdr *)buf; 174 rtm < (struct rt_msghdr *)lim; 175 rtm = (struct rt_msghdr *)(((char *)rtm) + rtm->rtm_msglen)) { 176 /* just for safety */ 177 if (!rtm->rtm_msglen) { 178 syslog(LOG_WARNING, "<%s> rtm_msglen is 0 " 179 "(buf=%p lim=%p rtm=%p)", __func__, 180 buf, lim, rtm); 181 break; 182 } 183 if (((struct rt_msghdr *)buf)->rtm_version != RTM_VERSION) { 184 syslog(LOG_WARNING, 185 "<%s> routing message version mismatch " 186 "(buf=%p lim=%p rtm=%p)", __func__, 187 buf, lim, rtm); 188 continue; 189 } 190 191 if (FILTER_MATCH(rtm->rtm_type, filter) == 0) 192 continue; 193 194 switch (rtm->rtm_type) { 195 case RTM_GET: 196 case RTM_ADD: 197 case RTM_DELETE: 198 /* address related checks */ 199 sa = (struct sockaddr *)(rtm + 1); 200 get_rtaddrs(rtm->rtm_addrs, sa, rti_info); 201 if ((dst = rti_info[RTAX_DST]) == NULL || 202 dst->sa_family != AF_INET6) 203 continue; 204 205 if (IN6_IS_ADDR_LINKLOCAL(&SIN6(dst)->sin6_addr) || 206 IN6_IS_ADDR_MULTICAST(&SIN6(dst)->sin6_addr)) 207 continue; 208 209 if ((gw = rti_info[RTAX_GATEWAY]) == NULL || 210 gw->sa_family != AF_LINK) 211 continue; 212 if (ifindex && SDL(gw)->sdl_index != ifindex) 213 continue; 214 215 if (rti_info[RTAX_NETMASK] == NULL) 216 continue; 217 218 /* found */ 219 *lenp = rtm->rtm_msglen; 220 return (char *)rtm; 221 /* NOTREACHED */ 222 case RTM_NEWADDR: 223 case RTM_DELADDR: 224 ifam = (struct ifa_msghdr *)rtm; 225 226 /* address related checks */ 227 sa = (struct sockaddr *)(ifam + 1); 228 get_rtaddrs(ifam->ifam_addrs, sa, rti_info); 229 if ((ifa = rti_info[RTAX_IFA]) == NULL || 230 (ifa->sa_family != AF_INET && 231 ifa->sa_family != AF_INET6)) 232 continue; 233 234 if (ifa->sa_family == AF_INET6 && 235 (IN6_IS_ADDR_LINKLOCAL(&SIN6(ifa)->sin6_addr) || 236 IN6_IS_ADDR_MULTICAST(&SIN6(ifa)->sin6_addr))) 237 continue; 238 239 if (ifindex && ifam->ifam_index != ifindex) 240 continue; 241 242 /* found */ 243 *lenp = ifam->ifam_msglen; 244 return (char *)rtm; 245 /* NOTREACHED */ 246 case RTM_IFINFO: 247 case RTM_IFANNOUNCE: 248 /* found */ 249 *lenp = rtm->rtm_msglen; 250 return (char *)rtm; 251 /* NOTREACHED */ 252 } 253 } 254 255 return ((char *)rtm); 256 } 257 #undef FILTER_MATCH 258 259 struct in6_addr * 260 get_addr(char *buf) 261 { 262 struct rt_msghdr *rtm = (struct rt_msghdr *)buf; 263 struct sockaddr *sa, *rti_info[RTAX_MAX]; 264 265 sa = (struct sockaddr *)(rtm + 1); 266 get_rtaddrs(rtm->rtm_addrs, sa, rti_info); 267 268 return (&SIN6(rti_info[RTAX_DST])->sin6_addr); 269 } 270 271 int 272 get_rtm_ifindex(char *buf) 273 { 274 struct rt_msghdr *rtm = (struct rt_msghdr *)buf; 275 struct sockaddr *sa, *rti_info[RTAX_MAX]; 276 277 sa = (struct sockaddr *)(rtm + 1); 278 get_rtaddrs(rtm->rtm_addrs, sa, rti_info); 279 280 return (((struct sockaddr_dl *)rti_info[RTAX_GATEWAY])->sdl_index); 281 } 282 283 int 284 get_prefixlen(char *buf) 285 { 286 struct rt_msghdr *rtm = (struct rt_msghdr *)buf; 287 struct sockaddr *sa, *rti_info[RTAX_MAX]; 288 char *p, *lim; 289 290 sa = (struct sockaddr *)(rtm + 1); 291 get_rtaddrs(rtm->rtm_addrs, sa, rti_info); 292 sa = rti_info[RTAX_NETMASK]; 293 294 p = (char *)(&SIN6(sa)->sin6_addr); 295 lim = (char *)sa + sa->sa_len; 296 return prefixlen(p, lim); 297 } 298 299 int 300 prefixlen(unsigned char *p, unsigned char *lim) 301 { 302 int masklen; 303 304 for (masklen = 0; p < lim; p++) { 305 switch (*p) { 306 case 0xff: 307 masklen += 8; 308 break; 309 case 0xfe: 310 masklen += 7; 311 break; 312 case 0xfc: 313 masklen += 6; 314 break; 315 case 0xf8: 316 masklen += 5; 317 break; 318 case 0xf0: 319 masklen += 4; 320 break; 321 case 0xe0: 322 masklen += 3; 323 break; 324 case 0xc0: 325 masklen += 2; 326 break; 327 case 0x80: 328 masklen += 1; 329 break; 330 case 0x00: 331 break; 332 default: 333 return (-1); 334 } 335 } 336 337 return (masklen); 338 } 339 340 struct ifinfo * 341 update_persist_ifinfo(struct ifilist_head_t *ifi_head, const char *ifname) 342 { 343 struct ifinfo *ifi; 344 int ifindex; 345 346 ifi = NULL; 347 ifindex = if_nametoindex(ifname); 348 TAILQ_FOREACH(ifi, ifi_head, ifi_next) { 349 if (ifindex != 0) { 350 if (ifindex == ifi->ifi_ifindex) 351 break; 352 } else { 353 if (strncmp(ifname, ifi->ifi_ifname, 354 sizeof(ifi->ifi_ifname)) == 0) 355 break; 356 } 357 } 358 359 if (ifi == NULL) { 360 /* A new ifinfo element is needed. */ 361 syslog(LOG_DEBUG, "<%s> new entry: %s", __func__, 362 ifname); 363 364 ELM_MALLOC(ifi, exit(1)); 365 ifi->ifi_ifindex = 0; 366 strlcpy(ifi->ifi_ifname, ifname, sizeof(ifi->ifi_ifname)); 367 ifi->ifi_rainfo = NULL; 368 ifi->ifi_state = IFI_STATE_UNCONFIGURED; 369 TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next); 370 } 371 372 ifi->ifi_persist = 1; 373 374 syslog(LOG_DEBUG, "<%s> %s is marked PERSIST", __func__, 375 ifi->ifi_ifname); 376 syslog(LOG_DEBUG, "<%s> %s is state = %d", __func__, 377 ifi->ifi_ifname, ifi->ifi_state); 378 return (ifi); 379 } 380 381 int 382 update_ifinfo_nd_flags(struct ifinfo *ifi) 383 { 384 struct in6_ndireq nd; 385 int s; 386 int error; 387 388 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 389 syslog(LOG_ERR, 390 "<%s> socket() failed.", __func__); 391 return (1); 392 } 393 /* ND flags */ 394 memset(&nd, 0, sizeof(nd)); 395 strlcpy(nd.ifname, ifi->ifi_ifname, 396 sizeof(nd.ifname)); 397 error = ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd); 398 if (error) { 399 close(s); 400 if (errno != EPFNOSUPPORT) 401 syslog(LOG_ERR, "<%s> ioctl() failed.", __func__); 402 return (1); 403 } 404 ifi->ifi_nd_flags = nd.ndi.flags; 405 close(s); 406 407 return (0); 408 } 409 410 #define MAX_SYSCTL_TRY 5 411 412 struct ifinfo * 413 update_ifinfo(struct ifilist_head_t *ifi_head, int ifindex) 414 { 415 struct if_msghdr *ifm; 416 struct ifinfo *ifi = NULL; 417 struct sockaddr *sa; 418 struct sockaddr *rti_info[RTAX_MAX]; 419 char *msg; 420 size_t len; 421 char *lim; 422 int mib[] = { CTL_NET, PF_ROUTE, 0, AF_INET6, NET_RT_IFLIST, 0 }; 423 int error, ntry; 424 425 syslog(LOG_DEBUG, "<%s> enter", __func__); 426 427 ntry = 0; 428 do { 429 /* 430 * We'll try to get addresses several times in case that 431 * the number of addresses is unexpectedly increased during 432 * the two sysctl calls. This should rarely happen. 433 * Portability note: since FreeBSD does not add margin of 434 * memory at the first sysctl, the possibility of failure on 435 * the second sysctl call is a bit higher. 436 */ 437 438 if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) < 0) { 439 syslog(LOG_ERR, 440 "<%s> sysctl: NET_RT_IFLIST size get failed", 441 __func__); 442 exit(1); 443 } 444 if ((msg = malloc(len)) == NULL) { 445 syslog(LOG_ERR, "<%s> malloc failed", __func__); 446 exit(1); 447 } 448 if (sysctl(mib, nitems(mib), msg, &len, NULL, 0) < 0) { 449 if (errno != ENOMEM || ++ntry >= MAX_SYSCTL_TRY) { 450 free(msg); 451 syslog(LOG_ERR, 452 "<%s> sysctl: NET_RT_IFLIST get failed", 453 __func__); 454 exit(1); 455 } 456 free(msg); 457 msg = NULL; 458 } 459 } while (msg == NULL); 460 461 lim = msg + len; 462 for (ifm = (struct if_msghdr *)msg; 463 ifm != NULL && ifm < (struct if_msghdr *)lim; 464 ifm = get_next_msghdr(ifm,(struct if_msghdr *)lim)) { 465 int ifi_new; 466 467 syslog(LOG_DEBUG, "<%s> ifm = %p, lim = %p, diff = %zu", 468 __func__, ifm, lim, (char *)lim - (char *)ifm); 469 470 if (ifm->ifm_version != RTM_VERSION) { 471 syslog(LOG_ERR, 472 "<%s> ifm_vesrion mismatch", __func__); 473 exit(1); 474 } 475 if (ifm->ifm_msglen == 0) { 476 syslog(LOG_WARNING, 477 "<%s> ifm_msglen is 0", __func__); 478 free(msg); 479 return (NULL); 480 } 481 482 ifi_new = 0; 483 if (ifm->ifm_type == RTM_IFINFO) { 484 struct ifreq ifr; 485 int s; 486 char ifname[IFNAMSIZ]; 487 488 syslog(LOG_DEBUG, "<%s> RTM_IFINFO found. " 489 "ifm_index = %d, ifindex = %d", 490 __func__, ifm->ifm_index, ifindex); 491 492 /* when ifindex is specified */ 493 if (ifindex != UPDATE_IFINFO_ALL && 494 ifindex != ifm->ifm_index) 495 continue; 496 497 /* ifname */ 498 if (if_indextoname(ifm->ifm_index, ifname) == NULL) { 499 syslog(LOG_WARNING, 500 "<%s> ifname not found (idx=%d)", 501 __func__, ifm->ifm_index); 502 continue; 503 } 504 505 /* lookup an entry with the same ifindex */ 506 TAILQ_FOREACH(ifi, ifi_head, ifi_next) { 507 if (ifm->ifm_index == ifi->ifi_ifindex) 508 break; 509 if (strncmp(ifname, ifi->ifi_ifname, 510 sizeof(ifname)) == 0) 511 break; 512 } 513 if (ifi == NULL) { 514 syslog(LOG_DEBUG, 515 "<%s> new entry for idx=%d", 516 __func__, ifm->ifm_index); 517 ELM_MALLOC(ifi, exit(1)); 518 ifi->ifi_rainfo = NULL; 519 ifi->ifi_state = IFI_STATE_UNCONFIGURED; 520 ifi->ifi_persist = 0; 521 ifi_new = 1; 522 } 523 /* ifindex */ 524 ifi->ifi_ifindex = ifm->ifm_index; 525 526 /* ifname */ 527 strlcpy(ifi->ifi_ifname, ifname, IFNAMSIZ); 528 529 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 530 syslog(LOG_ERR, 531 "<%s> socket() failed.", __func__); 532 if (ifi_new) 533 free(ifi); 534 continue; 535 } 536 537 /* MTU */ 538 ifi->ifi_phymtu = ifm->ifm_data.ifi_mtu; 539 if (ifi->ifi_phymtu == 0) { 540 memset(&ifr, 0, sizeof(ifr)); 541 ifr.ifr_addr.sa_family = AF_INET6; 542 strlcpy(ifr.ifr_name, ifi->ifi_ifname, 543 sizeof(ifr.ifr_name)); 544 error = ioctl(s, SIOCGIFMTU, (caddr_t)&ifr); 545 if (error) { 546 close(s); 547 syslog(LOG_ERR, 548 "<%s> ioctl() failed.", 549 __func__); 550 if (ifi_new) 551 free(ifi); 552 continue; 553 } 554 ifi->ifi_phymtu = ifr.ifr_mtu; 555 if (ifi->ifi_phymtu == 0) { 556 syslog(LOG_WARNING, 557 "<%s> no interface mtu info" 558 " on %s. %d will be used.", 559 __func__, ifi->ifi_ifname, 560 IPV6_MMTU); 561 ifi->ifi_phymtu = IPV6_MMTU; 562 } 563 } 564 close(s); 565 566 /* ND flags */ 567 error = update_ifinfo_nd_flags(ifi); 568 if (error) { 569 if (ifi_new) 570 free(ifi); 571 continue; 572 } 573 574 /* SDL */ 575 sa = (struct sockaddr *)(ifm + 1); 576 get_rtaddrs(ifm->ifm_addrs, sa, rti_info); 577 if ((sa = rti_info[RTAX_IFP]) != NULL) { 578 if (sa->sa_family == AF_LINK) { 579 memcpy(&ifi->ifi_sdl, 580 (struct sockaddr_dl *)sa, 581 sizeof(ifi->ifi_sdl)); 582 } 583 } else 584 memset(&ifi->ifi_sdl, 0, 585 sizeof(ifi->ifi_sdl)); 586 587 /* flags */ 588 ifi->ifi_flags = ifm->ifm_flags; 589 590 /* type */ 591 ifi->ifi_type = ifm->ifm_type; 592 } else { 593 syslog(LOG_ERR, 594 "out of sync parsing NET_RT_IFLIST\n" 595 "expected %d, got %d\n msglen = %d\n", 596 RTM_IFINFO, ifm->ifm_type, ifm->ifm_msglen); 597 exit(1); 598 } 599 600 if (ifi_new) { 601 syslog(LOG_DEBUG, 602 "<%s> adding %s(idx=%d) to ifilist", 603 __func__, ifi->ifi_ifname, ifi->ifi_ifindex); 604 TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next); 605 } 606 } 607 free(msg); 608 609 if (mcastif != NULL) { 610 error = sock_mc_rr_update(&sock, mcastif); 611 if (error) 612 exit(1); 613 } 614 615 return (ifi); 616 } 617 618 static struct if_msghdr * 619 get_next_msghdr(struct if_msghdr *ifm, struct if_msghdr *lim) 620 { 621 struct ifa_msghdr *ifam; 622 623 for (ifam = (struct ifa_msghdr *)((char *)ifm + ifm->ifm_msglen); 624 ifam < (struct ifa_msghdr *)lim; 625 ifam = (struct ifa_msghdr *)((char *)ifam + ifam->ifam_msglen)) { 626 if (!ifam->ifam_msglen) { 627 syslog(LOG_WARNING, 628 "<%s> ifa_msglen is 0", __func__); 629 return (NULL); 630 } 631 if (ifam->ifam_type != RTM_NEWADDR) 632 break; 633 } 634 635 return ((struct if_msghdr *)ifam); 636 } 637 638 int 639 getinet6sysctl(int code) 640 { 641 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 }; 642 int value; 643 size_t size; 644 645 mib[3] = code; 646 size = sizeof(value); 647 if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0) 648 < 0) { 649 syslog(LOG_ERR, "<%s>: failed to get ip6 sysctl(%d): %s", 650 __func__, code, 651 strerror(errno)); 652 return (-1); 653 } 654 else 655 return (value); 656 } 657 658 659 int 660 sock_mc_join(struct sockinfo *s, int ifindex) 661 { 662 struct ipv6_mreq mreq; 663 char ifname[IFNAMSIZ]; 664 665 syslog(LOG_DEBUG, "<%s> enter", __func__); 666 667 if (ifindex == 0) 668 return (1); 669 670 /* 671 * join all routers multicast address on each advertising 672 * interface. 673 */ 674 memset(&mreq, 0, sizeof(mreq)); 675 /* XXX */ 676 memcpy(&mreq.ipv6mr_multiaddr.s6_addr, 677 &sin6_linklocal_allrouters.sin6_addr, 678 sizeof(mreq.ipv6mr_multiaddr.s6_addr)); 679 680 mreq.ipv6mr_interface = ifindex; 681 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, 682 sizeof(mreq)) < 0) { 683 syslog(LOG_ERR, 684 "<%s> IPV6_JOIN_GROUP(link) on %s: %s", 685 __func__, if_indextoname(ifindex, ifname), 686 strerror(errno)); 687 return (1); 688 } 689 syslog(LOG_DEBUG, 690 "<%s> %s: join link-local all-routers MC group", 691 __func__, if_indextoname(ifindex, ifname)); 692 693 return (0); 694 } 695 696 int 697 sock_mc_leave(struct sockinfo *s, int ifindex) 698 { 699 struct ipv6_mreq mreq; 700 char ifname[IFNAMSIZ]; 701 702 syslog(LOG_DEBUG, "<%s> enter", __func__); 703 704 if (ifindex == 0) 705 return (1); 706 707 /* 708 * join all routers multicast address on each advertising 709 * interface. 710 */ 711 712 memset(&mreq, 0, sizeof(mreq)); 713 /* XXX */ 714 memcpy(&mreq.ipv6mr_multiaddr.s6_addr, 715 &sin6_linklocal_allrouters.sin6_addr, 716 sizeof(mreq.ipv6mr_multiaddr.s6_addr)); 717 718 mreq.ipv6mr_interface = ifindex; 719 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq, 720 sizeof(mreq)) < 0) { 721 syslog(LOG_ERR, 722 "<%s> IPV6_JOIN_LEAVE(link) on %s: %s", 723 __func__, if_indextoname(ifindex, ifname), 724 strerror(errno)); 725 return (1); 726 } 727 syslog(LOG_DEBUG, 728 "<%s> %s: leave link-local all-routers MC group", 729 __func__, if_indextoname(ifindex, ifname)); 730 731 return (0); 732 } 733 734 int 735 sock_mc_rr_update(struct sockinfo *s, char *mif) 736 { 737 struct ipv6_mreq mreq; 738 739 syslog(LOG_DEBUG, "<%s> enter", __func__); 740 741 if (mif == NULL) 742 return (1); 743 /* 744 * When attending router renumbering, join all-routers site-local 745 * multicast group. 746 */ 747 /* XXX */ 748 memcpy(&mreq.ipv6mr_multiaddr.s6_addr, 749 &sin6_sitelocal_allrouters.sin6_addr, 750 sizeof(mreq.ipv6mr_multiaddr.s6_addr)); 751 if ((mreq.ipv6mr_interface = if_nametoindex(mif)) == 0) { 752 syslog(LOG_ERR, 753 "<%s> invalid interface: %s", 754 __func__, mif); 755 return (1); 756 } 757 758 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, 759 &mreq, sizeof(mreq)) < 0) { 760 syslog(LOG_ERR, 761 "<%s> IPV6_JOIN_GROUP(site) on %s: %s", 762 __func__, mif, strerror(errno)); 763 return (1); 764 } 765 766 syslog(LOG_DEBUG, 767 "<%s> %s: join site-local all-routers MC group", 768 __func__, mif); 769 770 return (0); 771 } 772