in6_ifattach.c revision 1.23
1/* $OpenBSD: in6_ifattach.c,v 1.23 2002/05/23 06:56:16 itojun Exp $ */ 2/* $KAME: in6_ifattach.c,v 1.124 2001/07/18 08:32:51 jinmei Exp $ */ 3 4/* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33#include <sys/param.h> 34#include <sys/systm.h> 35#include <sys/malloc.h> 36#include <sys/socket.h> 37#include <sys/sockio.h> 38#include <sys/kernel.h> 39#include <sys/syslog.h> 40#include <sys/md5k.h> 41 42#include <net/if.h> 43#include <net/if_dl.h> 44#include <net/if_types.h> 45#include <net/route.h> 46 47#include <netinet/in.h> 48#include <netinet/in_var.h> 49#include <netinet/if_ether.h> 50 51#include <netinet/ip6.h> 52#include <netinet6/ip6_var.h> 53#include <netinet6/in6_ifattach.h> 54#include <netinet6/ip6_var.h> 55#include <netinet6/nd6.h> 56 57struct in6_ifstat **in6_ifstat = NULL; 58struct icmp6_ifstat **icmp6_ifstat = NULL; 59size_t in6_ifstatmax = 0; 60size_t icmp6_ifstatmax = 0; 61unsigned long in6_maxmtu = 0; 62 63static int get_rand_ifid(struct ifnet *, struct in6_addr *); 64static int get_hw_ifid(struct ifnet *, struct in6_addr *); 65static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 66static int in6_ifattach_addaddr(struct ifnet *, struct in6_ifaddr *); 67static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 68static int in6_ifattach_loopback(struct ifnet *); 69 70#define EUI64_GBIT 0x01 71#define EUI64_UBIT 0x02 72#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 73#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 74#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 75#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 76#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 77 78#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 79#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 80 81/* 82 * Generate a last-resort interface identifier, when the machine has no 83 * IEEE802/EUI64 address sources. 84 * The goal here is to get an interface identifier that is 85 * (1) random enough and (2) does not change across reboot. 86 * We currently use MD5(hostname) for it. 87 */ 88static int 89get_rand_ifid(ifp, in6) 90 struct ifnet *ifp; 91 struct in6_addr *in6; /* upper 64bits are preserved */ 92{ 93 MD5_CTX ctxt; 94 u_int8_t digest[16]; 95 96#if 0 97 /* we need at least several letters as seed for ifid */ 98 if (hostnamelen < 3) 99 return -1; 100#endif 101 102 /* generate 8 bytes of pseudo-random value. */ 103 bzero(&ctxt, sizeof(ctxt)); 104 MD5Init(&ctxt); 105 MD5Update(&ctxt, hostname, hostnamelen); 106 MD5Final(digest, &ctxt); 107 108 /* assumes sizeof(digest) > sizeof(ifid) */ 109 bcopy(digest, &in6->s6_addr[8], 8); 110 111 /* make sure to set "u" bit to local, and "g" bit to individual. */ 112 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 113 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 114 115 /* convert EUI64 into IPv6 interface identifier */ 116 EUI64_TO_IFID(in6); 117 118 return 0; 119} 120 121/* 122 * Get interface identifier for the specified interface. 123 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 124 */ 125static int 126get_hw_ifid(ifp, in6) 127 struct ifnet *ifp; 128 struct in6_addr *in6; /* upper 64bits are preserved */ 129{ 130 struct ifaddr *ifa; 131 struct sockaddr_dl *sdl; 132 u_int8_t *addr; 133 size_t addrlen; 134 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 135 static u_int8_t allone[8] = 136 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 137 138 for (ifa = ifp->if_addrlist.tqh_first; 139 ifa; 140 ifa = ifa->ifa_list.tqe_next) 141 { 142 if (ifa->ifa_addr->sa_family != AF_LINK) 143 continue; 144 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 145 if (sdl == NULL) 146 continue; 147 if (sdl->sdl_alen == 0) 148 continue; 149 150 goto found; 151 } 152 153 return -1; 154 155found: 156 addr = LLADDR(sdl); 157 addrlen = sdl->sdl_alen; 158 159 /* get EUI64 */ 160 switch (ifp->if_type) { 161 case IFT_ETHER: 162 case IFT_FDDI: 163 case IFT_ATM: 164 /* IEEE802/EUI64 cases - what others? */ 165 166 /* look at IEEE802/EUI64 only */ 167 if (addrlen != 8 && addrlen != 6) 168 return -1; 169 170 /* 171 * check for invalid MAC address - on bsdi, we see it a lot 172 * since wildboar configures all-zero MAC on pccard before 173 * card insertion. 174 */ 175 if (bcmp(addr, allzero, addrlen) == 0) 176 return -1; 177 if (bcmp(addr, allone, addrlen) == 0) 178 return -1; 179 180 /* make EUI64 address */ 181 if (addrlen == 8) 182 bcopy(addr, &in6->s6_addr[8], 8); 183 else if (addrlen == 6) { 184 in6->s6_addr[8] = addr[0]; 185 in6->s6_addr[9] = addr[1]; 186 in6->s6_addr[10] = addr[2]; 187 in6->s6_addr[11] = 0xff; 188 in6->s6_addr[12] = 0xfe; 189 in6->s6_addr[13] = addr[3]; 190 in6->s6_addr[14] = addr[4]; 191 in6->s6_addr[15] = addr[5]; 192 } 193 break; 194 195 case IFT_ARCNET: 196 if (addrlen != 1) 197 return -1; 198 if (!addr[0]) 199 return -1; 200 201 bzero(&in6->s6_addr[8], 8); 202 in6->s6_addr[15] = addr[0]; 203 204 /* 205 * due to insufficient bitwidth, we mark it local. 206 */ 207 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 208 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 209 break; 210 211 case IFT_GIF: 212#ifdef IFT_STF 213 case IFT_STF: 214#endif 215 /* 216 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 217 * however, IPv4 address is not very suitable as unique 218 * identifier source (can be renumbered). 219 * we don't do this. 220 */ 221 return -1; 222 223 default: 224 return -1; 225 } 226 227 /* sanity check: g bit must not indicate "group" */ 228 if (EUI64_GROUP(in6)) 229 return -1; 230 231 /* convert EUI64 into IPv6 interface identifier */ 232 EUI64_TO_IFID(in6); 233 234 /* 235 * sanity check: ifid must not be all zero, avoid conflict with 236 * subnet router anycast 237 */ 238 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 239 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 240 return -1; 241 } 242 243 return 0; 244} 245 246/* 247 * Get interface identifier for the specified interface. If it is not 248 * available on ifp0, borrow interface identifier from other information 249 * sources. 250 */ 251static int 252get_ifid(ifp0, altifp, in6) 253 struct ifnet *ifp0; 254 struct ifnet *altifp; /* secondary EUI64 source */ 255 struct in6_addr *in6; 256{ 257 struct ifnet *ifp; 258 259 /* first, try to get it from the interface itself */ 260 if (get_hw_ifid(ifp0, in6) == 0) { 261 nd6log((LOG_DEBUG, 262 "%s: got interface identifier from itself\n", 263 ifp0->if_xname)); 264 goto success; 265 } 266 267 /* try secondary EUI64 source. this basically is for ATM PVC */ 268 if (altifp && get_hw_ifid(altifp, in6) == 0) { 269 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 270 ifp0->if_xname, altifp->if_xname)); 271 goto success; 272 } 273 274 /* next, try to get it from some other hardware interface */ 275 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) 276 { 277 if (ifp == ifp0) 278 continue; 279 if (get_hw_ifid(ifp, in6) != 0) 280 continue; 281 282 /* 283 * to borrow ifid from other interface, ifid needs to be 284 * globally unique 285 */ 286 if (IFID_UNIVERSAL(in6)) { 287 nd6log((LOG_DEBUG, 288 "%s: borrow interface identifier from %s\n", 289 ifp0->if_xname, ifp->if_xname)); 290 goto success; 291 } 292 } 293 294 /* last resort: get from random number source */ 295 if (get_rand_ifid(ifp, in6) == 0) { 296 nd6log((LOG_DEBUG, 297 "%s: interface identifier generated by random number\n", 298 ifp0->if_xname)); 299 goto success; 300 } 301 302 printf("%s: failed to get interface identifier\n", ifp0->if_xname); 303 return -1; 304 305success: 306 nd6log((LOG_INFO, "%s: ifid: " 307 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 308 ifp0->if_xname, 309 in6->s6_addr[8], in6->s6_addr[9], 310 in6->s6_addr[10], in6->s6_addr[11], 311 in6->s6_addr[12], in6->s6_addr[13], 312 in6->s6_addr[14], in6->s6_addr[15])); 313 return 0; 314} 315 316/* 317 * configure IPv6 interface address. XXX code duplicated with in.c 318 */ 319static int 320in6_ifattach_addaddr(ifp, ia) 321 struct ifnet *ifp; 322 struct in6_ifaddr *ia; 323{ 324 struct in6_ifaddr *oia; 325 struct ifaddr *ifa; 326 int error; 327 int rtflag; 328 struct in6_addr llsol; 329 330 /* 331 * initialize if_addrlist, if we are the very first one 332 */ 333 ifa = TAILQ_FIRST(&ifp->if_addrlist); 334 if (ifa == NULL) { 335 TAILQ_INIT(&ifp->if_addrlist); 336 } 337 338 /* 339 * link the interface address to global list 340 */ 341 TAILQ_INSERT_TAIL(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 342 ia->ia_ifa.ifa_refcnt++; 343 344 /* 345 * Also link into the IPv6 address chain beginning with in6_ifaddr. 346 * kazu opposed it, but itojun & jinmei wanted. 347 */ 348 if ((oia = in6_ifaddr) != NULL) { 349 for (; oia->ia_next; oia = oia->ia_next) 350 continue; 351 oia->ia_next = ia; 352 } else 353 in6_ifaddr = ia; 354 ia->ia_ifa.ifa_refcnt++; 355 356 /* 357 * give the interface a chance to initialize, in case this 358 * is the first address to be added. 359 */ 360 if (ifp->if_ioctl != NULL) { 361 int s; 362 s = splimp(); 363 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 364 splx(s); 365 } else 366 error = 0; 367 if (error) { 368 switch (error) { 369 case EAFNOSUPPORT: 370 printf("%s: IPv6 not supported\n", ifp->if_xname); 371 break; 372 default: 373 printf("%s: SIOCSIFADDR error %d\n", ifp->if_xname, 374 error); 375 break; 376 } 377 378 /* undo changes */ 379 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 380 IFAFREE(&ia->ia_ifa); 381 if (oia) 382 oia->ia_next = ia->ia_next; 383 else 384 in6_ifaddr = ia->ia_next; 385 IFAFREE(&ia->ia_ifa); 386 return -1; 387 } 388 389 /* configure link-layer address resolution */ 390 rtflag = 0; 391 if (IN6_ARE_ADDR_EQUAL(&ia->ia_prefixmask.sin6_addr, &in6mask128)) 392 rtflag = RTF_HOST; 393 else { 394 switch (ifp->if_type) { 395 case IFT_LOOP: 396#ifdef IFT_STF 397 case IFT_STF: 398#endif 399 rtflag = 0; 400 break; 401 default: 402 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 403 ia->ia_ifa.ifa_flags |= RTF_CLONING; 404 rtflag = RTF_CLONING; 405 break; 406 } 407 } 408 409 /* add route to the interface. */ 410 rtrequest(RTM_ADD, 411 (struct sockaddr *)&ia->ia_addr, 412 (struct sockaddr *)&ia->ia_addr, 413 (struct sockaddr *)&ia->ia_prefixmask, 414 RTF_UP | rtflag, 415 (struct rtentry **)0); 416 ia->ia_flags |= IFA_ROUTE; 417 418 if ((rtflag & RTF_CLONING) != 0 && 419 (ifp->if_flags & IFF_MULTICAST) != 0) { 420 /* Restore saved multicast addresses (if any). */ 421 in6_restoremkludge(ia, ifp); 422 423 /* 424 * join solicited multicast address 425 */ 426 bzero(&llsol, sizeof(llsol)); 427 llsol.s6_addr16[0] = htons(0xff02); 428 llsol.s6_addr16[1] = htons(ifp->if_index); 429 llsol.s6_addr32[1] = 0; 430 llsol.s6_addr32[2] = htonl(1); 431 llsol.s6_addr32[3] = ia->ia_addr.sin6_addr.s6_addr32[3]; 432 llsol.s6_addr8[12] = 0xff; 433 (void)in6_addmulti(&llsol, ifp, &error); 434 435 /* XXX should we run DAD on other interface types? */ 436 if (in6if_do_dad(ifp)) { 437 /* mark the address TENTATIVE, if needed. */ 438 ia->ia6_flags |= IN6_IFF_TENTATIVE; 439 /* nd6_dad_start() will be called in in6_if_up */ 440 } 441 } 442 443 return 0; 444} 445 446static int 447in6_ifattach_linklocal(ifp, altifp) 448 struct ifnet *ifp; 449 struct ifnet *altifp; /*secondary EUI64 source*/ 450{ 451 struct in6_ifaddr *ia; 452 453 /* 454 * configure link-local address 455 */ 456 ia = (struct in6_ifaddr *)malloc(sizeof(*ia), M_IFADDR, M_WAITOK); 457 bzero((caddr_t)ia, sizeof(*ia)); 458 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 459 if (ifp->if_flags & IFF_POINTOPOINT) 460 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 461 else 462 ia->ia_ifa.ifa_dstaddr = NULL; 463 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 464 ia->ia_ifp = ifp; 465 466 bzero(&ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 467 ia->ia_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 468 ia->ia_prefixmask.sin6_family = AF_INET6; 469 ia->ia_prefixmask.sin6_addr = in6mask64; 470 471 /* just in case */ 472 bzero(&ia->ia_dstaddr, sizeof(ia->ia_dstaddr)); 473 ia->ia_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 474 ia->ia_dstaddr.sin6_family = AF_INET6; 475 476 bzero(&ia->ia_addr, sizeof(ia->ia_addr)); 477 ia->ia_addr.sin6_len = sizeof(struct sockaddr_in6); 478 ia->ia_addr.sin6_family = AF_INET6; 479 ia->ia_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 480 ia->ia_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 481 ia->ia_addr.sin6_addr.s6_addr32[1] = 0; 482 if (ifp->if_flags & IFF_LOOPBACK) { 483 ia->ia_addr.sin6_addr.s6_addr32[2] = 0; 484 ia->ia_addr.sin6_addr.s6_addr32[3] = htonl(1); 485 } else { 486 if (get_ifid(ifp, altifp, &ia->ia_addr.sin6_addr) != 0) { 487 nd6log((LOG_ERR, 488 "%s: no ifid available\n", ifp->if_xname)); 489 free(ia, M_IFADDR); 490 return -1; 491 } 492 } 493 494 ia->ia_ifa.ifa_metric = ifp->if_metric; 495 496 if (in6_ifattach_addaddr(ifp, ia) != 0) { 497 /* ia will be freed on failure */ 498 return -1; 499 } 500 501 return 0; 502} 503 504static int 505in6_ifattach_loopback(ifp) 506 struct ifnet *ifp; /* must be IFT_LOOP */ 507{ 508 struct in6_ifaddr *ia; 509 510 /* 511 * configure link-local address 512 */ 513 ia = (struct in6_ifaddr *)malloc(sizeof(*ia), M_IFADDR, M_WAITOK); 514 bzero((caddr_t)ia, sizeof(*ia)); 515 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 516 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 517 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 518 ia->ia_ifp = ifp; 519 520 bzero(&ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 521 ia->ia_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 522 ia->ia_prefixmask.sin6_family = AF_INET6; 523 ia->ia_prefixmask.sin6_addr = in6mask128; 524 525 /* 526 * Always initialize ia_dstaddr (= broadcast address) to loopback 527 * address, to make getifaddr happier. 528 * 529 * For BSDI, it is mandatory. The BSDI version of 530 * ifa_ifwithroute() rejects to add a route to the loopback 531 * interface. Even for other systems, loopback looks somewhat 532 * special. 533 */ 534 bzero(&ia->ia_dstaddr, sizeof(ia->ia_dstaddr)); 535 ia->ia_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 536 ia->ia_dstaddr.sin6_family = AF_INET6; 537 ia->ia_dstaddr.sin6_addr = in6addr_loopback; 538 539 bzero(&ia->ia_addr, sizeof(ia->ia_addr)); 540 ia->ia_addr.sin6_len = sizeof(struct sockaddr_in6); 541 ia->ia_addr.sin6_family = AF_INET6; 542 ia->ia_addr.sin6_addr = in6addr_loopback; 543 544 ia->ia_ifa.ifa_metric = ifp->if_metric; 545 546 if (in6_ifattach_addaddr(ifp, ia) != 0) { 547 /* ia will be freed on failure */ 548 return -1; 549 } 550 551 return 0; 552} 553 554/* 555 * XXX multiple loopback interface needs more care. for instance, 556 * nodelocal address needs to be configured onto only one of them. 557 * XXX multiple link-local address case 558 */ 559void 560in6_ifattach(ifp, altifp) 561 struct ifnet *ifp; 562 struct ifnet *altifp; /* secondary EUI64 source */ 563{ 564 static size_t if_indexlim = 8; 565 struct sockaddr_in6 mltaddr; 566 struct sockaddr_in6 mltmask; 567 struct sockaddr_in6 gate; 568 struct sockaddr_in6 mask; 569 struct in6_ifaddr *ia; 570 struct in6_addr in6; 571 572 /* some of the interfaces are inherently not IPv6 capable */ 573 switch (ifp->if_type) { 574 case IFT_BRIDGE: 575 case IFT_ENC: 576 case IFT_PFLOG: 577 return; 578 case IFT_PROPVIRTUAL: 579 if (strncmp("bridge", ifp->if_xname, sizeof("bridge")) == 0 && 580 '0' <= ifp->if_xname[sizeof("bridge")] && 581 ifp->if_xname[sizeof("bridge")] <= '9') 582 return; 583 break; 584 } 585 586 /* 587 * We have some arrays that should be indexed by if_index. 588 * since if_index will grow dynamically, they should grow too. 589 * struct in6_ifstat **in6_ifstat 590 * struct icmp6_ifstat **icmp6_ifstat 591 */ 592 if (in6_ifstat == NULL || icmp6_ifstat == NULL || 593 if_index >= if_indexlim) { 594 size_t n; 595 caddr_t q; 596 size_t olim; 597 598 olim = if_indexlim; 599 while (if_index >= if_indexlim) 600 if_indexlim <<= 1; 601 602 /* grow in6_ifstat */ 603 n = if_indexlim * sizeof(struct in6_ifstat *); 604 q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK); 605 bzero(q, n); 606 if (in6_ifstat) { 607 bcopy((caddr_t)in6_ifstat, q, 608 olim * sizeof(struct in6_ifstat *)); 609 free((caddr_t)in6_ifstat, M_IFADDR); 610 } 611 in6_ifstat = (struct in6_ifstat **)q; 612 in6_ifstatmax = if_indexlim; 613 614 /* grow icmp6_ifstat */ 615 n = if_indexlim * sizeof(struct icmp6_ifstat *); 616 q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK); 617 bzero(q, n); 618 if (icmp6_ifstat) { 619 bcopy((caddr_t)icmp6_ifstat, q, 620 olim * sizeof(struct icmp6_ifstat *)); 621 free((caddr_t)icmp6_ifstat, M_IFADDR); 622 } 623 icmp6_ifstat = (struct icmp6_ifstat **)q; 624 icmp6_ifstatmax = if_indexlim; 625 } 626 627 /* create a multicast kludge storage (if we have not had one) */ 628 in6_createmkludge(ifp); 629 630 /* 631 * quirks based on interface type 632 */ 633 switch (ifp->if_type) { 634#ifdef IFT_STF 635 case IFT_STF: 636 /* 637 * 6to4 interface is a very special kind of beast. 638 * no multicast, no linklocal. RFC2529 specifies how to make 639 * linklocals for 6to4 interface, but there's no use and 640 * it is rather harmful to have one. 641 */ 642 goto statinit; 643#endif 644 default: 645 break; 646 } 647 648 /* 649 * usually, we require multicast capability to the interface 650 */ 651 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 652 log(LOG_INFO, "in6_ifattach: " 653 "%s is not multicast capable, IPv6 not enabled\n", 654 ifp->if_xname); 655 return; 656 } 657 658 /* 659 * assign link-local address, if there's none 660 */ 661 ia = in6ifa_ifpforlinklocal(ifp, 0); 662 if (ia == NULL) { 663 if (in6_ifattach_linklocal(ifp, altifp) != 0) 664 return; 665 ia = in6ifa_ifpforlinklocal(ifp, 0); 666 667 if (ia == NULL) { 668 printf("%s: failed to add link-local address\n", 669 ifp->if_xname); 670 671 /* we can't initialize multicasts without link-local */ 672 goto statinit; 673 } 674 } 675 676 if (ifp->if_flags & IFF_POINTOPOINT) { 677 /* 678 * route local address to loopback 679 */ 680 bzero(&gate, sizeof(gate)); 681 gate.sin6_len = sizeof(struct sockaddr_in6); 682 gate.sin6_family = AF_INET6; 683 gate.sin6_addr = in6addr_loopback; 684 bzero(&mask, sizeof(mask)); 685 mask.sin6_len = sizeof(struct sockaddr_in6); 686 mask.sin6_family = AF_INET6; 687 mask.sin6_addr = in6mask64; 688 rtrequest(RTM_ADD, 689 (struct sockaddr *)&ia->ia_addr, 690 (struct sockaddr *)&gate, 691 (struct sockaddr *)&mask, 692 RTF_UP|RTF_HOST, 693 (struct rtentry **)0); 694 } 695 696 /* 697 * assign loopback address for loopback interface 698 * XXX multiple loopback interface case 699 */ 700 in6 = in6addr_loopback; 701 if (ifp->if_flags & IFF_LOOPBACK) { 702 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 703 if (in6_ifattach_loopback(ifp) != 0) 704 return; 705 } 706 } 707 708#ifdef DIAGNOSTIC 709 if (!ia) { 710 panic("ia == NULL in in6_ifattach"); 711 /*NOTREACHED*/ 712 } 713#endif 714 715 /* 716 * join multicast 717 */ 718 if (ifp->if_flags & IFF_MULTICAST) { 719 int error; /* not used */ 720 struct in6_multi *in6m; 721 722 /* Restore saved multicast addresses(if any). */ 723 in6_restoremkludge(ia, ifp); 724 725 bzero(&mltmask, sizeof(mltmask)); 726 mltmask.sin6_len = sizeof(struct sockaddr_in6); 727 mltmask.sin6_family = AF_INET6; 728 mltmask.sin6_addr = in6mask32; 729 730 /* 731 * join link-local all-nodes address 732 */ 733 bzero(&mltaddr, sizeof(mltaddr)); 734 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 735 mltaddr.sin6_family = AF_INET6; 736 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 737 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 738 739 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 740 if (in6m == NULL) { 741 rtrequest(RTM_ADD, 742 (struct sockaddr *)&mltaddr, 743 (struct sockaddr *)&ia->ia_addr, 744 (struct sockaddr *)&mltmask, 745 RTF_UP|RTF_CLONING, /* xxx */ 746 (struct rtentry **)0); 747 (void)in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 748 } 749 750 if (ifp->if_flags & IFF_LOOPBACK) { 751 in6 = in6addr_loopback; 752 ia = in6ifa_ifpwithaddr(ifp, &in6); 753 /* 754 * join node-local all-nodes address, on loopback 755 */ 756 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 757 758 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 759 if (in6m == NULL && ia != NULL) { 760 rtrequest(RTM_ADD, 761 (struct sockaddr *)&mltaddr, 762 (struct sockaddr *)&ia->ia_addr, 763 (struct sockaddr *)&mltmask, 764 RTF_UP, 765 (struct rtentry **)0); 766 (void)in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 767 } 768 } 769 } 770 771statinit:; 772 773 /* update dynamically. */ 774 if (in6_maxmtu < ifp->if_mtu) 775 in6_maxmtu = ifp->if_mtu; 776 777 if (in6_ifstat[ifp->if_index] == NULL) { 778 in6_ifstat[ifp->if_index] = (struct in6_ifstat *) 779 malloc(sizeof(struct in6_ifstat), M_IFADDR, M_WAITOK); 780 bzero(in6_ifstat[ifp->if_index], sizeof(struct in6_ifstat)); 781 } 782 if (icmp6_ifstat[ifp->if_index] == NULL) { 783 icmp6_ifstat[ifp->if_index] = (struct icmp6_ifstat *) 784 malloc(sizeof(struct icmp6_ifstat), M_IFADDR, M_WAITOK); 785 bzero(icmp6_ifstat[ifp->if_index], sizeof(struct icmp6_ifstat)); 786 } 787 788 /* initialize NDP variables */ 789 nd6_ifattach(ifp); 790} 791 792/* 793 * NOTE: in6_ifdetach() does not support loopback if at this moment. 794 */ 795void 796in6_ifdetach(ifp) 797 struct ifnet *ifp; 798{ 799 struct in6_ifaddr *ia, *oia; 800 struct ifaddr *ifa, *next; 801 struct rtentry *rt; 802 short rtflags; 803 struct sockaddr_in6 sin6; 804 struct in6_multi *in6m; 805 806 /* nuke prefix list. this may try to remove some of ifaddrs as well */ 807 in6_purgeprefix(ifp); 808 809 /* remove neighbor management table */ 810 nd6_purge(ifp); 811 812 /* nuke any of IPv6 addresses we have */ 813 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 814 { 815 next = ifa->ifa_list.tqe_next; 816 if (ifa->ifa_addr->sa_family != AF_INET6) 817 continue; 818 in6_purgeaddr(ifa, ifp); 819 } 820 821 /* undo everything done by in6_ifattach(), just in case */ 822 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 823 { 824 if (ifa->ifa_addr->sa_family != AF_INET6 825 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 826 continue; 827 } 828 829 ia = (struct in6_ifaddr *)ifa; 830 831 /* leave from all multicast groups joined */ 832 while ((in6m = LIST_FIRST(&ia->ia6_multiaddrs)) != NULL) 833 in6_delmulti(in6m); 834 835 /* remove from the routing table */ 836 if ((ia->ia_flags & IFA_ROUTE) 837 && (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0))) { 838 rtflags = rt->rt_flags; 839 rtfree(rt); 840 rtrequest(RTM_DELETE, 841 (struct sockaddr *)&ia->ia_addr, 842 (struct sockaddr *)&ia->ia_addr, 843 (struct sockaddr *)&ia->ia_prefixmask, 844 rtflags, (struct rtentry **)0); 845 } 846 847 /* remove from the linked list */ 848 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 849 IFAFREE(&ia->ia_ifa); 850 851 /* also remove from the IPv6 address chain(itojun&jinmei) */ 852 oia = ia; 853 if (oia == (ia = in6_ifaddr)) 854 in6_ifaddr = ia->ia_next; 855 else { 856 while (ia->ia_next && (ia->ia_next != oia)) 857 ia = ia->ia_next; 858 if (ia->ia_next) 859 ia->ia_next = oia->ia_next; 860 else { 861 nd6log((LOG_ERR, 862 "%s: didn't unlink in6ifaddr from " 863 "list\n", ifp->if_xname)); 864 } 865 } 866 867 IFAFREE(&oia->ia_ifa); 868 } 869 870 /* cleanup multicast address kludge table, if there is any */ 871 in6_purgemkludge(ifp); 872 873 /* 874 * remove neighbor management table. we call it twice just to make 875 * sure we nuke everything. maybe we need just one call. 876 * XXX: since the first call did not release addresses, some prefixes 877 * might remain. We should call nd6_purge() again to release the 878 * prefixes after removing all addresses above. 879 * (Or can we just delay calling nd6_purge until at this point?) 880 */ 881 nd6_purge(ifp); 882 883 /* remove route to link-local allnodes multicast (ff02::1) */ 884 bzero(&sin6, sizeof(sin6)); 885 sin6.sin6_len = sizeof(struct sockaddr_in6); 886 sin6.sin6_family = AF_INET6; 887 sin6.sin6_addr = in6addr_linklocal_allnodes; 888 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 889 rt = rtalloc1((struct sockaddr *)&sin6, 0); 890 if (rt && rt->rt_ifp == ifp) { 891 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), 892 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 893 rtfree(rt); 894 } 895} 896