1 /* $FreeBSD$ */ 2 /* $KAME: if.c,v 1.17 2001/01/21 15:27:30 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * Copyright (C) 2011 Hiroki Sato <hrs@FreeBSD.org> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/param.h> 35 #include <sys/socket.h> 36 #include <sys/sysctl.h> 37 #include <sys/ioctl.h> 38 #include <net/if.h> 39 #include <net/if_dl.h> 40 #include <net/if_types.h> 41 #include <net/ethernet.h> 42 #include <net/route.h> 43 #include <netinet/in.h> 44 #include <netinet/in_var.h> 45 #include <netinet/ip6.h> 46 #include <netinet/icmp6.h> 47 #include <netinet6/nd6.h> 48 #include <unistd.h> 49 #include <errno.h> 50 #include <netdb.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <syslog.h> 54 55 #include "pathnames.h" 56 #include "rtadvd.h" 57 #include "if.h" 58 59 #define ROUNDUP(a, size) \ 60 (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a)) 61 62 #define NEXT_SA(ap) \ 63 (ap) = (struct sockaddr *)((caddr_t)(ap) + \ 64 ((ap)->sa_len ? ROUNDUP((ap)->sa_len, sizeof(u_long)) : \ 65 sizeof(u_long))) 66 67 struct sockaddr_in6 sin6_linklocal_allnodes = { 68 .sin6_len = sizeof(sin6_linklocal_allnodes), 69 .sin6_family = AF_INET6, 70 .sin6_addr = IN6ADDR_LINKLOCAL_ALLNODES_INIT, 71 }; 72 73 struct sockaddr_in6 sin6_linklocal_allrouters = { 74 .sin6_len = sizeof(sin6_linklocal_allrouters), 75 .sin6_family = AF_INET6, 76 .sin6_addr = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT, 77 }; 78 79 struct sockaddr_in6 sin6_sitelocal_allrouters = { 80 .sin6_len = sizeof(sin6_sitelocal_allrouters), 81 .sin6_family = AF_INET6, 82 .sin6_addr = IN6ADDR_SITELOCAL_ALLROUTERS_INIT, 83 }; 84 85 struct sockinfo sock = { .si_fd = -1, .si_name = NULL }; 86 struct sockinfo rtsock = { .si_fd = -1, .si_name = NULL }; 87 struct sockinfo ctrlsock = { .si_fd = -1, .si_name = _PATH_CTRL_SOCK }; 88 89 char *mcastif; 90 91 static void get_rtaddrs(int, struct sockaddr *, 92 struct sockaddr **); 93 static struct if_msghdr *get_next_msghdr(struct if_msghdr *, 94 struct if_msghdr *); 95 96 static void 97 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info) 98 { 99 int i; 100 101 for (i = 0; i < RTAX_MAX; i++) { 102 if (addrs & (1 << i)) { 103 rti_info[i] = sa; 104 NEXT_SA(sa); 105 } 106 else 107 rti_info[i] = NULL; 108 } 109 } 110 111 #define ROUNDUP8(a) (1 + (((a) - 1) | 7)) 112 int 113 lladdropt_length(struct sockaddr_dl *sdl) 114 { 115 switch (sdl->sdl_type) { 116 case IFT_ETHER: 117 return (ROUNDUP8(ETHER_ADDR_LEN + 2)); 118 default: 119 return (0); 120 } 121 } 122 123 void 124 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt) 125 { 126 char *addr; 127 128 ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */ 129 130 switch (sdl->sdl_type) { 131 case IFT_ETHER: 132 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3; 133 addr = (char *)(ndopt + 1); 134 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN); 135 break; 136 default: 137 syslog(LOG_ERR, "<%s> unsupported link type(%d)", 138 __func__, sdl->sdl_type); 139 exit(1); 140 } 141 142 return; 143 } 144 145 int 146 rtbuf_len(void) 147 { 148 size_t len; 149 int mib[6] = {CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0}; 150 151 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) 152 return (-1); 153 154 return (len); 155 } 156 157 #define FILTER_MATCH(type, filter) ((0x1 << type) & filter) 158 #define SIN6(s) ((struct sockaddr_in6 *)(s)) 159 #define SDL(s) ((struct sockaddr_dl *)(s)) 160 char * 161 get_next_msg(char *buf, char *lim, int ifindex, size_t *lenp, int filter) 162 { 163 struct rt_msghdr *rtm; 164 struct ifa_msghdr *ifam; 165 struct sockaddr *sa, *dst, *gw, *ifa, *rti_info[RTAX_MAX]; 166 167 *lenp = 0; 168 for (rtm = (struct rt_msghdr *)buf; 169 rtm < (struct rt_msghdr *)lim; 170 rtm = (struct rt_msghdr *)(((char *)rtm) + rtm->rtm_msglen)) { 171 /* just for safety */ 172 if (!rtm->rtm_msglen) { 173 syslog(LOG_WARNING, "<%s> rtm_msglen is 0 " 174 "(buf=%p lim=%p rtm=%p)", __func__, 175 buf, lim, rtm); 176 break; 177 } 178 if (((struct rt_msghdr *)buf)->rtm_version != RTM_VERSION) { 179 syslog(LOG_WARNING, 180 "<%s> routing message version mismatch " 181 "(buf=%p lim=%p rtm=%p)", __func__, 182 buf, lim, rtm); 183 continue; 184 } 185 186 if (FILTER_MATCH(rtm->rtm_type, filter) == 0) 187 continue; 188 189 switch (rtm->rtm_type) { 190 case RTM_GET: 191 case RTM_ADD: 192 case RTM_DELETE: 193 /* address related checks */ 194 sa = (struct sockaddr *)(rtm + 1); 195 get_rtaddrs(rtm->rtm_addrs, sa, rti_info); 196 if ((dst = rti_info[RTAX_DST]) == NULL || 197 dst->sa_family != AF_INET6) 198 continue; 199 200 if (IN6_IS_ADDR_LINKLOCAL(&SIN6(dst)->sin6_addr) || 201 IN6_IS_ADDR_MULTICAST(&SIN6(dst)->sin6_addr)) 202 continue; 203 204 if ((gw = rti_info[RTAX_GATEWAY]) == NULL || 205 gw->sa_family != AF_LINK) 206 continue; 207 if (ifindex && SDL(gw)->sdl_index != ifindex) 208 continue; 209 210 if (rti_info[RTAX_NETMASK] == NULL) 211 continue; 212 213 /* found */ 214 *lenp = rtm->rtm_msglen; 215 return (char *)rtm; 216 /* NOTREACHED */ 217 case RTM_NEWADDR: 218 case RTM_DELADDR: 219 ifam = (struct ifa_msghdr *)rtm; 220 221 /* address related checks */ 222 sa = (struct sockaddr *)(ifam + 1); 223 get_rtaddrs(ifam->ifam_addrs, sa, rti_info); 224 if ((ifa = rti_info[RTAX_IFA]) == NULL || 225 (ifa->sa_family != AF_INET && 226 ifa->sa_family != AF_INET6)) 227 continue; 228 229 if (ifa->sa_family == AF_INET6 && 230 (IN6_IS_ADDR_LINKLOCAL(&SIN6(ifa)->sin6_addr) || 231 IN6_IS_ADDR_MULTICAST(&SIN6(ifa)->sin6_addr))) 232 continue; 233 234 if (ifindex && ifam->ifam_index != ifindex) 235 continue; 236 237 /* found */ 238 *lenp = ifam->ifam_msglen; 239 return (char *)rtm; 240 /* NOTREACHED */ 241 case RTM_IFINFO: 242 case RTM_IFANNOUNCE: 243 /* found */ 244 *lenp = rtm->rtm_msglen; 245 return (char *)rtm; 246 /* NOTREACHED */ 247 } 248 } 249 250 return ((char *)rtm); 251 } 252 #undef FILTER_MATCH 253 254 struct in6_addr * 255 get_addr(char *buf) 256 { 257 struct rt_msghdr *rtm = (struct rt_msghdr *)buf; 258 struct sockaddr *sa, *rti_info[RTAX_MAX]; 259 260 sa = (struct sockaddr *)(rtm + 1); 261 get_rtaddrs(rtm->rtm_addrs, sa, rti_info); 262 263 return (&SIN6(rti_info[RTAX_DST])->sin6_addr); 264 } 265 266 int 267 get_rtm_ifindex(char *buf) 268 { 269 struct rt_msghdr *rtm = (struct rt_msghdr *)buf; 270 struct sockaddr *sa, *rti_info[RTAX_MAX]; 271 272 sa = (struct sockaddr *)(rtm + 1); 273 get_rtaddrs(rtm->rtm_addrs, sa, rti_info); 274 275 return (((struct sockaddr_dl *)rti_info[RTAX_GATEWAY])->sdl_index); 276 } 277 278 int 279 get_prefixlen(char *buf) 280 { 281 struct rt_msghdr *rtm = (struct rt_msghdr *)buf; 282 struct sockaddr *sa, *rti_info[RTAX_MAX]; 283 char *p, *lim; 284 285 sa = (struct sockaddr *)(rtm + 1); 286 get_rtaddrs(rtm->rtm_addrs, sa, rti_info); 287 sa = rti_info[RTAX_NETMASK]; 288 289 p = (char *)(&SIN6(sa)->sin6_addr); 290 lim = (char *)sa + sa->sa_len; 291 return prefixlen(p, lim); 292 } 293 294 int 295 prefixlen(unsigned char *p, unsigned char *lim) 296 { 297 int masklen; 298 299 for (masklen = 0; p < lim; p++) { 300 switch (*p) { 301 case 0xff: 302 masklen += 8; 303 break; 304 case 0xfe: 305 masklen += 7; 306 break; 307 case 0xfc: 308 masklen += 6; 309 break; 310 case 0xf8: 311 masklen += 5; 312 break; 313 case 0xf0: 314 masklen += 4; 315 break; 316 case 0xe0: 317 masklen += 3; 318 break; 319 case 0xc0: 320 masklen += 2; 321 break; 322 case 0x80: 323 masklen += 1; 324 break; 325 case 0x00: 326 break; 327 default: 328 return (-1); 329 } 330 } 331 332 return (masklen); 333 } 334 335 struct ifinfo * 336 update_persist_ifinfo(struct ifilist_head_t *ifi_head, const char *ifname) 337 { 338 struct ifinfo *ifi; 339 int ifindex; 340 341 ifi = NULL; 342 ifindex = if_nametoindex(ifname); 343 TAILQ_FOREACH(ifi, ifi_head, ifi_next) { 344 if (ifindex != 0) { 345 if (ifindex == ifi->ifi_ifindex) 346 break; 347 } else { 348 if (strncmp(ifname, ifi->ifi_ifname, 349 sizeof(ifi->ifi_ifname)) == 0) 350 break; 351 } 352 } 353 354 if (ifi == NULL) { 355 /* A new ifinfo element is needed. */ 356 syslog(LOG_DEBUG, "<%s> new entry: %s", __func__, 357 ifname); 358 359 ELM_MALLOC(ifi, exit(1)); 360 ifi->ifi_ifindex = 0; 361 strncpy(ifi->ifi_ifname, ifname, sizeof(ifi->ifi_ifname)-1); 362 ifi->ifi_ifname[sizeof(ifi->ifi_ifname)-1] = '\0'; 363 ifi->ifi_rainfo = NULL; 364 ifi->ifi_state = IFI_STATE_UNCONFIGURED; 365 TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next); 366 } 367 368 ifi->ifi_persist = 1; 369 370 syslog(LOG_DEBUG, "<%s> %s is marked PERSIST", __func__, 371 ifi->ifi_ifname); 372 syslog(LOG_DEBUG, "<%s> %s is state = %d", __func__, 373 ifi->ifi_ifname, ifi->ifi_state); 374 return (ifi); 375 } 376 377 int 378 update_ifinfo_nd_flags(struct ifinfo *ifi) 379 { 380 struct in6_ndireq nd; 381 int s; 382 int error; 383 384 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 385 syslog(LOG_ERR, 386 "<%s> socket() failed.", __func__); 387 return (1); 388 } 389 /* ND flags */ 390 memset(&nd, 0, sizeof(nd)); 391 strncpy(nd.ifname, ifi->ifi_ifname, 392 sizeof(nd.ifname)); 393 error = ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd); 394 if (error) { 395 close(s); 396 if (errno != EPFNOSUPPORT) 397 syslog(LOG_ERR, "<%s> ioctl() failed.", __func__); 398 return (1); 399 } 400 ifi->ifi_nd_flags = nd.ndi.flags; 401 close(s); 402 403 return (0); 404 } 405 406 struct ifinfo * 407 update_ifinfo(struct ifilist_head_t *ifi_head, int ifindex) 408 { 409 struct if_msghdr *ifm; 410 struct ifinfo *ifi = NULL; 411 struct sockaddr *sa; 412 struct sockaddr *rti_info[RTAX_MAX]; 413 char *msg; 414 size_t len; 415 char *lim; 416 int mib[] = { CTL_NET, PF_ROUTE, 0, AF_INET6, NET_RT_IFLIST, 0 }; 417 int error; 418 419 syslog(LOG_DEBUG, "<%s> enter", __func__); 420 421 if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), NULL, &len, NULL, 0) < 422 0) { 423 syslog(LOG_ERR, 424 "<%s> sysctl: NET_RT_IFLIST size get failed", __func__); 425 exit(1); 426 } 427 if ((msg = malloc(len)) == NULL) { 428 syslog(LOG_ERR, "<%s> malloc failed", __func__); 429 exit(1); 430 } 431 if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), msg, &len, NULL, 0) < 432 0) { 433 syslog(LOG_ERR, 434 "<%s> sysctl: NET_RT_IFLIST get failed", __func__); 435 exit(1); 436 } 437 438 lim = msg + len; 439 for (ifm = (struct if_msghdr *)msg; 440 ifm != NULL && ifm < (struct if_msghdr *)lim; 441 ifm = get_next_msghdr(ifm,(struct if_msghdr *)lim)) { 442 int ifi_new; 443 444 syslog(LOG_DEBUG, "<%s> ifm = %p, lim = %p, diff = %zu", 445 __func__, ifm, lim, (char *)lim - (char *)ifm); 446 447 if (ifm->ifm_version != RTM_VERSION) { 448 syslog(LOG_ERR, 449 "<%s> ifm_vesrion mismatch", __func__); 450 exit(1); 451 } 452 if (ifm->ifm_msglen == 0) { 453 syslog(LOG_WARNING, 454 "<%s> ifm_msglen is 0", __func__); 455 free(msg); 456 return (NULL); 457 } 458 459 ifi_new = 0; 460 if (ifm->ifm_type == RTM_IFINFO) { 461 struct ifreq ifr; 462 int s; 463 char ifname[IFNAMSIZ]; 464 465 syslog(LOG_DEBUG, "<%s> RTM_IFINFO found. " 466 "ifm_index = %d, ifindex = %d", 467 __func__, ifm->ifm_index, ifindex); 468 469 /* when ifindex is specified */ 470 if (ifindex != UPDATE_IFINFO_ALL && 471 ifindex != ifm->ifm_index) 472 continue; 473 474 /* lookup an entry with the same ifindex */ 475 TAILQ_FOREACH(ifi, ifi_head, ifi_next) { 476 if (ifm->ifm_index == ifi->ifi_ifindex) 477 break; 478 if_indextoname(ifm->ifm_index, ifname); 479 if (strncmp(ifname, ifi->ifi_ifname, 480 sizeof(ifname)) == 0) 481 break; 482 } 483 if (ifi == NULL) { 484 syslog(LOG_DEBUG, 485 "<%s> new entry for idx=%d", 486 __func__, ifm->ifm_index); 487 ELM_MALLOC(ifi, exit(1)); 488 ifi->ifi_rainfo = NULL; 489 ifi->ifi_state = IFI_STATE_UNCONFIGURED; 490 ifi->ifi_persist = 0; 491 ifi_new = 1; 492 } 493 /* ifindex */ 494 ifi->ifi_ifindex = ifm->ifm_index; 495 496 /* ifname */ 497 if_indextoname(ifm->ifm_index, ifi->ifi_ifname); 498 if (ifi->ifi_ifname == NULL) { 499 syslog(LOG_WARNING, 500 "<%s> ifname not found (idx=%d)", 501 __func__, ifm->ifm_index); 502 if (ifi_new) 503 free(ifi); 504 continue; 505 } 506 507 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 508 syslog(LOG_ERR, 509 "<%s> socket() failed.", __func__); 510 if (ifi_new) 511 free(ifi); 512 continue; 513 } 514 515 /* MTU */ 516 ifi->ifi_phymtu = ifm->ifm_data.ifi_mtu; 517 if (ifi->ifi_phymtu == 0) { 518 memset(&ifr, 0, sizeof(ifr)); 519 ifr.ifr_addr.sa_family = AF_INET6; 520 strncpy(ifr.ifr_name, ifi->ifi_ifname, 521 sizeof(ifr.ifr_name)); 522 error = ioctl(s, SIOCGIFMTU, (caddr_t)&ifr); 523 if (error) { 524 close(s); 525 syslog(LOG_ERR, 526 "<%s> ioctl() failed.", 527 __func__); 528 if (ifi_new) 529 free(ifi); 530 continue; 531 } 532 ifi->ifi_phymtu = ifr.ifr_mtu; 533 if (ifi->ifi_phymtu == 0) { 534 syslog(LOG_WARNING, 535 "<%s> no interface mtu info" 536 " on %s. %d will be used.", 537 __func__, ifi->ifi_ifname, 538 IPV6_MMTU); 539 ifi->ifi_phymtu = IPV6_MMTU; 540 } 541 } 542 close(s); 543 544 /* ND flags */ 545 error = update_ifinfo_nd_flags(ifi); 546 if (error) { 547 if (ifi_new) 548 free(ifi); 549 continue; 550 } 551 552 /* SDL */ 553 sa = (struct sockaddr *)(ifm + 1); 554 get_rtaddrs(ifm->ifm_addrs, sa, rti_info); 555 if ((sa = rti_info[RTAX_IFP]) != NULL) { 556 if (sa->sa_family == AF_LINK) { 557 memcpy(&ifi->ifi_sdl, 558 (struct sockaddr_dl *)sa, 559 sizeof(ifi->ifi_sdl)); 560 } 561 } else 562 memset(&ifi->ifi_sdl, 0, 563 sizeof(ifi->ifi_sdl)); 564 565 /* flags */ 566 ifi->ifi_flags = ifm->ifm_flags; 567 568 /* type */ 569 ifi->ifi_type = ifm->ifm_type; 570 } else { 571 syslog(LOG_ERR, 572 "out of sync parsing NET_RT_IFLIST\n" 573 "expected %d, got %d\n msglen = %d\n", 574 RTM_IFINFO, ifm->ifm_type, ifm->ifm_msglen); 575 exit(1); 576 } 577 578 if (ifi_new) { 579 syslog(LOG_DEBUG, 580 "<%s> adding %s(idx=%d) to ifilist", 581 __func__, ifi->ifi_ifname, ifi->ifi_ifindex); 582 TAILQ_INSERT_TAIL(ifi_head, ifi, ifi_next); 583 } 584 } 585 free(msg); 586 587 if (mcastif != NULL) { 588 error = sock_mc_rr_update(&sock, mcastif); 589 if (error) 590 exit(1); 591 } 592 593 return (ifi); 594 } 595 596 static struct if_msghdr * 597 get_next_msghdr(struct if_msghdr *ifm, struct if_msghdr *lim) 598 { 599 struct ifa_msghdr *ifam; 600 601 for (ifam = (struct ifa_msghdr *)((char *)ifm + ifm->ifm_msglen); 602 ifam < (struct ifa_msghdr *)lim; 603 ifam = (struct ifa_msghdr *)((char *)ifam + ifam->ifam_msglen)) { 604 if (!ifam->ifam_msglen) { 605 syslog(LOG_WARNING, 606 "<%s> ifa_msglen is 0", __func__); 607 return (NULL); 608 } 609 if (ifam->ifam_type != RTM_NEWADDR) 610 break; 611 } 612 613 return ((struct if_msghdr *)ifam); 614 } 615 616 int 617 getinet6sysctl(int code) 618 { 619 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 }; 620 int value; 621 size_t size; 622 623 mib[3] = code; 624 size = sizeof(value); 625 if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0) 626 < 0) { 627 syslog(LOG_ERR, "<%s>: failed to get ip6 sysctl(%d): %s", 628 __func__, code, 629 strerror(errno)); 630 return (-1); 631 } 632 else 633 return (value); 634 } 635 636 637 int 638 sock_mc_join(struct sockinfo *s, int ifindex) 639 { 640 struct ipv6_mreq mreq; 641 char ifname[IFNAMSIZ]; 642 643 syslog(LOG_DEBUG, "<%s> enter", __func__); 644 645 if (ifindex == 0) 646 return (1); 647 648 /* 649 * join all routers multicast address on each advertising 650 * interface. 651 */ 652 memset(&mreq, 0, sizeof(mreq)); 653 /* XXX */ 654 memcpy(&mreq.ipv6mr_multiaddr.s6_addr, 655 &sin6_linklocal_allrouters.sin6_addr, 656 sizeof(mreq.ipv6mr_multiaddr.s6_addr)); 657 658 mreq.ipv6mr_interface = ifindex; 659 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, 660 sizeof(mreq)) < 0) { 661 syslog(LOG_ERR, 662 "<%s> IPV6_JOIN_GROUP(link) on %s: %s", 663 __func__, if_indextoname(ifindex, ifname), 664 strerror(errno)); 665 return (1); 666 } 667 syslog(LOG_DEBUG, 668 "<%s> %s: join link-local all-routers MC group", 669 __func__, if_indextoname(ifindex, ifname)); 670 671 return (0); 672 } 673 674 int 675 sock_mc_leave(struct sockinfo *s, int ifindex) 676 { 677 struct ipv6_mreq mreq; 678 char ifname[IFNAMSIZ]; 679 680 syslog(LOG_DEBUG, "<%s> enter", __func__); 681 682 if (ifindex == 0) 683 return (1); 684 685 /* 686 * join all routers multicast address on each advertising 687 * interface. 688 */ 689 690 memset(&mreq, 0, sizeof(mreq)); 691 /* XXX */ 692 memcpy(&mreq.ipv6mr_multiaddr.s6_addr, 693 &sin6_linklocal_allrouters.sin6_addr, 694 sizeof(mreq.ipv6mr_multiaddr.s6_addr)); 695 696 mreq.ipv6mr_interface = ifindex; 697 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq, 698 sizeof(mreq)) < 0) { 699 syslog(LOG_ERR, 700 "<%s> IPV6_JOIN_LEAVE(link) on %s: %s", 701 __func__, if_indextoname(ifindex, ifname), 702 strerror(errno)); 703 return (1); 704 } 705 syslog(LOG_DEBUG, 706 "<%s> %s: leave link-local all-routers MC group", 707 __func__, if_indextoname(ifindex, ifname)); 708 709 return (0); 710 } 711 712 int 713 sock_mc_rr_update(struct sockinfo *s, char *mif) 714 { 715 struct ipv6_mreq mreq; 716 717 syslog(LOG_DEBUG, "<%s> enter", __func__); 718 719 if (mif == NULL) 720 return (1); 721 /* 722 * When attending router renumbering, join all-routers site-local 723 * multicast group. 724 */ 725 /* XXX */ 726 memcpy(&mreq.ipv6mr_multiaddr.s6_addr, 727 &sin6_sitelocal_allrouters.sin6_addr, 728 sizeof(mreq.ipv6mr_multiaddr.s6_addr)); 729 if ((mreq.ipv6mr_interface = if_nametoindex(mif)) == 0) { 730 syslog(LOG_ERR, 731 "<%s> invalid interface: %s", 732 __func__, mif); 733 return (1); 734 } 735 736 if (setsockopt(s->si_fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, 737 &mreq, sizeof(mreq)) < 0) { 738 syslog(LOG_ERR, 739 "<%s> IPV6_JOIN_GROUP(site) on %s: %s", 740 __func__, mif, strerror(errno)); 741 return (1); 742 } 743 744 syslog(LOG_DEBUG, 745 "<%s> %s: join site-local all-routers MC group", 746 __func__, mif); 747 748 return (0); 749 } 750