1 /* $FreeBSD: src/sys/netinet6/in6_ifattach.c,v 1.2.2.6 2002/04/28 05:40:26 suz Exp $ */ 2 /* $DragonFly: src/sys/netinet6/in6_ifattach.c,v 1.3 2003/08/23 11:02:45 rob Exp $ */ 3 /* $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $ */ 4 5 /* 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 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/systm.h> 36 #include <sys/malloc.h> 37 #include <sys/socket.h> 38 #include <sys/sockio.h> 39 #include <sys/kernel.h> 40 #include <sys/syslog.h> 41 #include <sys/md5.h> 42 43 #include <net/if.h> 44 #include <net/if_dl.h> 45 #include <net/if_types.h> 46 #include <net/route.h> 47 48 #include <netinet/in.h> 49 #include <netinet/in_var.h> 50 #include <netinet/if_ether.h> 51 #include <netinet/in_pcb.h> 52 53 #include <netinet/ip6.h> 54 #include <netinet6/ip6_var.h> 55 #include <netinet6/in6_var.h> 56 #include <netinet6/in6_pcb.h> 57 #include <netinet6/in6_ifattach.h> 58 #include <netinet6/ip6_var.h> 59 #include <netinet6/nd6.h> 60 #include <netinet6/scope6_var.h> 61 62 #include <net/net_osdep.h> 63 64 struct in6_ifstat **in6_ifstat = NULL; 65 struct icmp6_ifstat **icmp6_ifstat = NULL; 66 size_t in6_ifstatmax = 0; 67 size_t icmp6_ifstatmax = 0; 68 unsigned long in6_maxmtu = 0; 69 70 #ifdef IP6_AUTO_LINKLOCAL 71 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; 72 #else 73 int ip6_auto_linklocal = 1; /* enable by default */ 74 #endif 75 76 struct callout in6_tmpaddrtimer_ch; 77 78 extern struct inpcbinfo udbinfo; 79 extern struct inpcbinfo ripcbinfo; 80 81 static int get_rand_ifid (struct ifnet *, struct in6_addr *); 82 static int generate_tmp_ifid (u_int8_t *, const u_int8_t *, u_int8_t *); 83 static int get_hw_ifid (struct ifnet *, struct in6_addr *); 84 static int get_ifid (struct ifnet *, struct ifnet *, struct in6_addr *); 85 static int in6_ifattach_linklocal (struct ifnet *, struct ifnet *); 86 static int in6_ifattach_loopback (struct ifnet *); 87 88 #define EUI64_GBIT 0x01 89 #define EUI64_UBIT 0x02 90 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 91 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 92 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 93 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 94 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 95 96 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 97 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 98 99 /* 100 * Generate a last-resort interface identifier, when the machine has no 101 * IEEE802/EUI64 address sources. 102 * The goal here is to get an interface identifier that is 103 * (1) random enough and (2) does not change across reboot. 104 * We currently use MD5(hostname) for it. 105 */ 106 static int 107 get_rand_ifid(ifp, in6) 108 struct ifnet *ifp; 109 struct in6_addr *in6; /* upper 64bits are preserved */ 110 { 111 MD5_CTX ctxt; 112 u_int8_t digest[16]; 113 int hostnamelen = strlen(hostname); 114 115 #if 0 116 /* we need at least several letters as seed for ifid */ 117 if (hostnamelen < 3) 118 return -1; 119 #endif 120 121 /* generate 8 bytes of pseudo-random value. */ 122 bzero(&ctxt, sizeof(ctxt)); 123 MD5Init(&ctxt); 124 MD5Update(&ctxt, hostname, hostnamelen); 125 MD5Final(digest, &ctxt); 126 127 /* assumes sizeof(digest) > sizeof(ifid) */ 128 bcopy(digest, &in6->s6_addr[8], 8); 129 130 /* make sure to set "u" bit to local, and "g" bit to individual. */ 131 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 132 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 133 134 /* convert EUI64 into IPv6 interface identifier */ 135 EUI64_TO_IFID(in6); 136 137 return 0; 138 } 139 140 static int 141 generate_tmp_ifid(seed0, seed1, ret) 142 u_int8_t *seed0, *ret; 143 const u_int8_t *seed1; 144 { 145 MD5_CTX ctxt; 146 u_int8_t seed[16], digest[16], nullbuf[8]; 147 u_int32_t val32; 148 struct timeval tv; 149 150 /* If there's no hisotry, start with a random seed. */ 151 bzero(nullbuf, sizeof(nullbuf)); 152 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 153 int i; 154 155 for (i = 0; i < 2; i++) { 156 microtime(&tv); 157 val32 = random() ^ tv.tv_usec; 158 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 159 } 160 } else { 161 bcopy(seed0, seed, 8); 162 } 163 164 /* copy the right-most 64-bits of the given address */ 165 /* XXX assumption on the size of IFID */ 166 bcopy(seed1, &seed[8], 8); 167 168 if (0) { /* for debugging purposes only */ 169 int i; 170 171 printf("generate_tmp_ifid: new randomized ID from: "); 172 for (i = 0; i < 16; i++) 173 printf("%02x", seed[i]); 174 printf(" "); 175 } 176 177 /* generate 16 bytes of pseudo-random value. */ 178 bzero(&ctxt, sizeof(ctxt)); 179 MD5Init(&ctxt); 180 MD5Update(&ctxt, seed, sizeof(seed)); 181 MD5Final(digest, &ctxt); 182 183 /* 184 * RFC 3041 3.2.1. (3) 185 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 186 * left-most bit is numbered 0) to zero. 187 */ 188 bcopy(digest, ret, 8); 189 ret[0] &= ~EUI64_UBIT; 190 191 /* 192 * XXX: we'd like to ensure that the generated value is not zero 193 * for simplicity. If the caclculated digest happens to be zero, 194 * use a random non-zero value as the last resort. 195 */ 196 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 197 log(LOG_INFO, 198 "generate_tmp_ifid: computed MD5 value is zero.\n"); 199 200 microtime(&tv); 201 val32 = random() ^ tv.tv_usec; 202 val32 = 1 + (val32 % (0xffffffff - 1)); 203 } 204 205 /* 206 * RFC 3041 3.2.1. (4) 207 * Take the rightmost 64-bits of the MD5 digest and save them in 208 * stable storage as the history value to be used in the next 209 * iteration of the algorithm. 210 */ 211 bcopy(&digest[8], seed0, 8); 212 213 if (0) { /* for debugging purposes only */ 214 int i; 215 216 printf("to: "); 217 for (i = 0; i < 16; i++) 218 printf("%02x", digest[i]); 219 printf("\n"); 220 } 221 222 return 0; 223 } 224 225 /* 226 * Get interface identifier for the specified interface. 227 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 228 */ 229 static int 230 get_hw_ifid(ifp, in6) 231 struct ifnet *ifp; 232 struct in6_addr *in6; /* upper 64bits are preserved */ 233 { 234 struct ifaddr *ifa; 235 struct sockaddr_dl *sdl; 236 u_int8_t *addr; 237 size_t addrlen; 238 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 239 static u_int8_t allone[8] = 240 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 241 242 for (ifa = ifp->if_addrlist.tqh_first; 243 ifa; 244 ifa = ifa->ifa_list.tqe_next) 245 { 246 if (ifa->ifa_addr->sa_family != AF_LINK) 247 continue; 248 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 249 if (sdl == NULL) 250 continue; 251 if (sdl->sdl_alen == 0) 252 continue; 253 254 goto found; 255 } 256 257 return -1; 258 259 found: 260 addr = LLADDR(sdl); 261 addrlen = sdl->sdl_alen; 262 263 /* get EUI64 */ 264 switch (ifp->if_type) { 265 case IFT_ETHER: 266 case IFT_FDDI: 267 case IFT_ATM: 268 case IFT_IEEE1394: 269 #ifdef IFT_IEEE80211 270 case IFT_IEEE80211: 271 #endif 272 /* IEEE802/EUI64 cases - what others? */ 273 /* IEEE1394 uses 16byte length address starting with EUI64 */ 274 if (addrlen > 8) 275 addrlen = 8; 276 277 /* look at IEEE802/EUI64 only */ 278 if (addrlen != 8 && addrlen != 6) 279 return -1; 280 281 /* 282 * check for invalid MAC address - on bsdi, we see it a lot 283 * since wildboar configures all-zero MAC on pccard before 284 * card insertion. 285 */ 286 if (bcmp(addr, allzero, addrlen) == 0) 287 return -1; 288 if (bcmp(addr, allone, addrlen) == 0) 289 return -1; 290 291 /* make EUI64 address */ 292 if (addrlen == 8) 293 bcopy(addr, &in6->s6_addr[8], 8); 294 else if (addrlen == 6) { 295 in6->s6_addr[8] = addr[0]; 296 in6->s6_addr[9] = addr[1]; 297 in6->s6_addr[10] = addr[2]; 298 in6->s6_addr[11] = 0xff; 299 in6->s6_addr[12] = 0xfe; 300 in6->s6_addr[13] = addr[3]; 301 in6->s6_addr[14] = addr[4]; 302 in6->s6_addr[15] = addr[5]; 303 } 304 break; 305 306 case IFT_ARCNET: 307 if (addrlen != 1) 308 return -1; 309 if (!addr[0]) 310 return -1; 311 312 bzero(&in6->s6_addr[8], 8); 313 in6->s6_addr[15] = addr[0]; 314 315 /* 316 * due to insufficient bitwidth, we mark it local. 317 */ 318 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 319 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 320 break; 321 322 case IFT_GIF: 323 #ifdef IFT_STF 324 case IFT_STF: 325 #endif 326 /* 327 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 328 * however, IPv4 address is not very suitable as unique 329 * identifier source (can be renumbered). 330 * we don't do this. 331 */ 332 return -1; 333 334 default: 335 return -1; 336 } 337 338 /* sanity check: g bit must not indicate "group" */ 339 if (EUI64_GROUP(in6)) 340 return -1; 341 342 /* convert EUI64 into IPv6 interface identifier */ 343 EUI64_TO_IFID(in6); 344 345 /* 346 * sanity check: ifid must not be all zero, avoid conflict with 347 * subnet router anycast 348 */ 349 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 350 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 351 return -1; 352 } 353 354 return 0; 355 } 356 357 /* 358 * Get interface identifier for the specified interface. If it is not 359 * available on ifp0, borrow interface identifier from other information 360 * sources. 361 */ 362 static int 363 get_ifid(ifp0, altifp, in6) 364 struct ifnet *ifp0; 365 struct ifnet *altifp; /* secondary EUI64 source */ 366 struct in6_addr *in6; 367 { 368 struct ifnet *ifp; 369 370 /* first, try to get it from the interface itself */ 371 if (get_hw_ifid(ifp0, in6) == 0) { 372 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 373 if_name(ifp0))); 374 goto success; 375 } 376 377 /* try secondary EUI64 source. this basically is for ATM PVC */ 378 if (altifp && get_hw_ifid(altifp, in6) == 0) { 379 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 380 if_name(ifp0), if_name(altifp))); 381 goto success; 382 } 383 384 /* next, try to get it from some other hardware interface */ 385 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) 386 { 387 if (ifp == ifp0) 388 continue; 389 if (get_hw_ifid(ifp, in6) != 0) 390 continue; 391 392 /* 393 * to borrow ifid from other interface, ifid needs to be 394 * globally unique 395 */ 396 if (IFID_UNIVERSAL(in6)) { 397 nd6log((LOG_DEBUG, 398 "%s: borrow interface identifier from %s\n", 399 if_name(ifp0), if_name(ifp))); 400 goto success; 401 } 402 } 403 404 /* last resort: get from random number source */ 405 if (get_rand_ifid(ifp, in6) == 0) { 406 nd6log((LOG_DEBUG, 407 "%s: interface identifier generated by random number\n", 408 if_name(ifp0))); 409 goto success; 410 } 411 412 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 413 return -1; 414 415 success: 416 nd6log((LOG_INFO, "%s: ifid: " 417 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 418 if_name(ifp0), 419 in6->s6_addr[8], in6->s6_addr[9], 420 in6->s6_addr[10], in6->s6_addr[11], 421 in6->s6_addr[12], in6->s6_addr[13], 422 in6->s6_addr[14], in6->s6_addr[15])); 423 return 0; 424 } 425 426 static int 427 in6_ifattach_linklocal(ifp, altifp) 428 struct ifnet *ifp; 429 struct ifnet *altifp; /* secondary EUI64 source */ 430 { 431 struct in6_ifaddr *ia; 432 struct in6_aliasreq ifra; 433 struct nd_prefix pr0; 434 int i, error; 435 436 /* 437 * configure link-local address. 438 */ 439 bzero(&ifra, sizeof(ifra)); 440 441 /* 442 * in6_update_ifa() does not use ifra_name, but we accurately set it 443 * for safety. 444 */ 445 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 446 447 ifra.ifra_addr.sin6_family = AF_INET6; 448 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 449 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 450 #ifdef SCOPEDROUTING 451 ifra.ifra_addr.sin6_addr.s6_addr16[1] = 0 452 #else 453 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); /* XXX */ 454 #endif 455 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 456 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 457 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 458 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 459 } else { 460 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 461 nd6log((LOG_ERR, 462 "%s: no ifid available\n", if_name(ifp))); 463 return -1; 464 } 465 } 466 #ifdef SCOPEDROUTING 467 ifra.ifra_addr.sin6_scope_id = 468 in6_addr2scopeid(ifp, &ifra.ifra_addr.sin6_addr); 469 #endif 470 471 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 472 ifra.ifra_prefixmask.sin6_family = AF_INET6; 473 ifra.ifra_prefixmask.sin6_addr = in6mask64; 474 #ifdef SCOPEDROUTING 475 /* take into accound the sin6_scope_id field for routing */ 476 ifra.ifra_prefixmask.sin6_scope_id = 0xffffffff; 477 #endif 478 /* link-local addresses should NEVER expire. */ 479 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 480 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 481 482 /* 483 * Do not let in6_update_ifa() do DAD, since we need a random delay 484 * before sending an NS at the first time the interface becomes up. 485 * Instead, in6_if_up() will start DAD with a proper random delay. 486 */ 487 ifra.ifra_flags |= IN6_IFF_NODAD; 488 489 /* 490 * Now call in6_update_ifa() to do a bunch of procedures to configure 491 * a link-local address. We can set NULL to the 3rd argument, because 492 * we know there's no other link-local address on the interface 493 * and therefore we are adding one (instead of updating one). 494 */ 495 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 496 /* 497 * XXX: When the interface does not support IPv6, this call 498 * would fail in the SIOCSIFADDR ioctl. I believe the 499 * notification is rather confusing in this case, so just 500 * supress it. (jinmei@kame.net 20010130) 501 */ 502 if (error != EAFNOSUPPORT) 503 log(LOG_NOTICE, "in6_ifattach_linklocal: failed to " 504 "configure a link-local address on %s " 505 "(errno=%d)\n", 506 if_name(ifp), error); 507 return(-1); 508 } 509 510 /* 511 * Adjust ia6_flags so that in6_if_up will perform DAD. 512 * XXX: Some P2P interfaces seem not to send packets just after 513 * becoming up, so we skip p2p interfaces for safety. 514 */ 515 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 516 #ifdef DIAGNOSTIC 517 if (!ia) { 518 panic("ia == NULL in in6_ifattach_linklocal"); 519 /* NOTREACHED */ 520 } 521 #endif 522 if (in6if_do_dad(ifp) && (ifp->if_flags & IFF_POINTOPOINT) == 0) { 523 ia->ia6_flags &= ~IN6_IFF_NODAD; 524 ia->ia6_flags |= IN6_IFF_TENTATIVE; 525 } 526 527 /* 528 * Make the link-local prefix (fe80::/64%link) as on-link. 529 * Since we'd like to manage prefixes separately from addresses, 530 * we make an ND6 prefix structure for the link-local prefix, 531 * and add it to the prefix list as a never-expire prefix. 532 * XXX: this change might affect some existing code base... 533 */ 534 bzero(&pr0, sizeof(pr0)); 535 pr0.ndpr_ifp = ifp; 536 /* this should be 64 at this moment. */ 537 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 538 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 539 pr0.ndpr_prefix = ifra.ifra_addr; 540 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 541 for (i = 0; i < 4; i++) { 542 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 543 in6mask64.s6_addr32[i]; 544 } 545 /* 546 * Initialize parameters. The link-local prefix must always be 547 * on-link, and its lifetimes never expire. 548 */ 549 pr0.ndpr_raf_onlink = 1; 550 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 551 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 552 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 553 /* 554 * Since there is no other link-local addresses, nd6_prefix_lookup() 555 * probably returns NULL. However, we cannot always expect the result. 556 * For example, if we first remove the (only) existing link-local 557 * address, and then reconfigure another one, the prefix is still 558 * valid with referring to the old link-local address. 559 */ 560 if (nd6_prefix_lookup(&pr0) == NULL) { 561 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 562 return(error); 563 } 564 565 return 0; 566 } 567 568 static int 569 in6_ifattach_loopback(ifp) 570 struct ifnet *ifp; /* must be IFT_LOOP */ 571 { 572 struct in6_aliasreq ifra; 573 int error; 574 575 bzero(&ifra, sizeof(ifra)); 576 577 /* 578 * in6_update_ifa() does not use ifra_name, but we accurately set it 579 * for safety. 580 */ 581 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 582 583 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 584 ifra.ifra_prefixmask.sin6_family = AF_INET6; 585 ifra.ifra_prefixmask.sin6_addr = in6mask128; 586 587 /* 588 * Always initialize ia_dstaddr (= broadcast address) to loopback 589 * address. Follows IPv4 practice - see in_ifinit(). 590 */ 591 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 592 ifra.ifra_dstaddr.sin6_family = AF_INET6; 593 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 594 595 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 596 ifra.ifra_addr.sin6_family = AF_INET6; 597 ifra.ifra_addr.sin6_addr = in6addr_loopback; 598 599 /* the loopback address should NEVER expire. */ 600 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 601 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 602 603 /* we don't need to perform DAD on loopback interfaces. */ 604 ifra.ifra_flags |= IN6_IFF_NODAD; 605 606 /* skip registration to the prefix list. XXX should be temporary. */ 607 ifra.ifra_flags |= IN6_IFF_NOPFX; 608 609 /* 610 * We are sure that this is a newly assigned address, so we can set 611 * NULL to the 3rd arg. 612 */ 613 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 614 log(LOG_ERR, "in6_ifattach_loopback: failed to configure " 615 "the loopback address on %s (errno=%d)\n", 616 if_name(ifp), error); 617 return(-1); 618 } 619 620 return 0; 621 } 622 623 /* 624 * compute NI group address, based on the current hostname setting. 625 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 626 * 627 * when ifp == NULL, the caller is responsible for filling scopeid. 628 */ 629 int 630 in6_nigroup(ifp, name, namelen, in6) 631 struct ifnet *ifp; 632 const char *name; 633 int namelen; 634 struct in6_addr *in6; 635 { 636 const char *p; 637 u_char *q; 638 MD5_CTX ctxt; 639 u_int8_t digest[16]; 640 char l; 641 char n[64]; /* a single label must not exceed 63 chars */ 642 643 if (!namelen || !name) 644 return -1; 645 646 p = name; 647 while (p && *p && *p != '.' && p - name < namelen) 648 p++; 649 if (p - name > sizeof(n) - 1) 650 return -1; /* label too long */ 651 l = p - name; 652 strncpy(n, name, l); 653 n[(int)l] = '\0'; 654 for (q = n; *q; q++) { 655 if ('A' <= *q && *q <= 'Z') 656 *q = *q - 'A' + 'a'; 657 } 658 659 /* generate 8 bytes of pseudo-random value. */ 660 bzero(&ctxt, sizeof(ctxt)); 661 MD5Init(&ctxt); 662 MD5Update(&ctxt, &l, sizeof(l)); 663 MD5Update(&ctxt, n, l); 664 MD5Final(digest, &ctxt); 665 666 bzero(in6, sizeof(*in6)); 667 in6->s6_addr16[0] = htons(0xff02); 668 if (ifp) 669 in6->s6_addr16[1] = htons(ifp->if_index); 670 in6->s6_addr8[11] = 2; 671 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 672 673 return 0; 674 } 675 676 void 677 in6_nigroup_attach(name, namelen) 678 const char *name; 679 int namelen; 680 { 681 struct ifnet *ifp; 682 struct sockaddr_in6 mltaddr; 683 struct in6_multi *in6m; 684 int error; 685 686 bzero(&mltaddr, sizeof(mltaddr)); 687 mltaddr.sin6_family = AF_INET6; 688 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 689 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 690 return; 691 692 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) 693 { 694 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 695 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 696 if (!in6m) { 697 if (!in6_addmulti(&mltaddr.sin6_addr, ifp, &error)) { 698 nd6log((LOG_ERR, "%s: failed to join %s " 699 "(errno=%d)\n", if_name(ifp), 700 ip6_sprintf(&mltaddr.sin6_addr), 701 error)); 702 } 703 } 704 } 705 } 706 707 void 708 in6_nigroup_detach(name, namelen) 709 const char *name; 710 int namelen; 711 { 712 struct ifnet *ifp; 713 struct sockaddr_in6 mltaddr; 714 struct in6_multi *in6m; 715 716 bzero(&mltaddr, sizeof(mltaddr)); 717 mltaddr.sin6_family = AF_INET6; 718 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 719 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 720 return; 721 722 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) 723 { 724 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 725 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 726 if (in6m) 727 in6_delmulti(in6m); 728 } 729 } 730 731 /* 732 * XXX multiple loopback interface needs more care. for instance, 733 * nodelocal address needs to be configured onto only one of them. 734 * XXX multiple link-local address case 735 */ 736 void 737 in6_ifattach(ifp, altifp) 738 struct ifnet *ifp; 739 struct ifnet *altifp; /* secondary EUI64 source */ 740 { 741 static size_t if_indexlim = 8; 742 struct in6_ifaddr *ia; 743 struct in6_addr in6; 744 745 /* some of the interfaces are inherently not IPv6 capable */ 746 switch (ifp->if_type) { 747 #ifdef IFT_BRIDGE /*OpenBSD 2.8*/ 748 case IFT_BRIDGE: 749 return; 750 #endif 751 } 752 753 /* 754 * We have some arrays that should be indexed by if_index. 755 * since if_index will grow dynamically, they should grow too. 756 * struct in6_ifstat **in6_ifstat 757 * struct icmp6_ifstat **icmp6_ifstat 758 */ 759 if (in6_ifstat == NULL || icmp6_ifstat == NULL || 760 if_index >= if_indexlim) { 761 size_t n; 762 caddr_t q; 763 size_t olim; 764 765 olim = if_indexlim; 766 while (if_index >= if_indexlim) 767 if_indexlim <<= 1; 768 769 /* grow in6_ifstat */ 770 n = if_indexlim * sizeof(struct in6_ifstat *); 771 q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK); 772 bzero(q, n); 773 if (in6_ifstat) { 774 bcopy((caddr_t)in6_ifstat, q, 775 olim * sizeof(struct in6_ifstat *)); 776 free((caddr_t)in6_ifstat, M_IFADDR); 777 } 778 in6_ifstat = (struct in6_ifstat **)q; 779 in6_ifstatmax = if_indexlim; 780 781 /* grow icmp6_ifstat */ 782 n = if_indexlim * sizeof(struct icmp6_ifstat *); 783 q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK); 784 bzero(q, n); 785 if (icmp6_ifstat) { 786 bcopy((caddr_t)icmp6_ifstat, q, 787 olim * sizeof(struct icmp6_ifstat *)); 788 free((caddr_t)icmp6_ifstat, M_IFADDR); 789 } 790 icmp6_ifstat = (struct icmp6_ifstat **)q; 791 icmp6_ifstatmax = if_indexlim; 792 } 793 794 /* initialize scope identifiers */ 795 scope6_ifattach(ifp); 796 797 /* 798 * quirks based on interface type 799 */ 800 switch (ifp->if_type) { 801 #ifdef IFT_STF 802 case IFT_STF: 803 /* 804 * 6to4 interface is a very special kind of beast. 805 * no multicast, no linklocal. RFC2529 specifies how to make 806 * linklocals for 6to4 interface, but there's no use and 807 * it is rather harmful to have one. 808 */ 809 goto statinit; 810 #endif 811 default: 812 break; 813 } 814 815 /* 816 * usually, we require multicast capability to the interface 817 */ 818 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 819 log(LOG_INFO, "in6_ifattach: " 820 "%s is not multicast capable, IPv6 not enabled\n", 821 if_name(ifp)); 822 return; 823 } 824 825 /* 826 * assign loopback address for loopback interface. 827 * XXX multiple loopback interface case. 828 */ 829 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 830 in6 = in6addr_loopback; 831 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 832 if (in6_ifattach_loopback(ifp) != 0) 833 return; 834 } 835 } 836 837 /* 838 * assign a link-local address, if there's none. 839 */ 840 if (ip6_auto_linklocal) { 841 ia = in6ifa_ifpforlinklocal(ifp, 0); 842 if (ia == NULL) { 843 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 844 /* linklocal address assigned */ 845 } else { 846 /* failed to assign linklocal address. bark? */ 847 } 848 } 849 } 850 851 #ifdef IFT_STF /* XXX */ 852 statinit: 853 #endif 854 855 /* update dynamically. */ 856 if (in6_maxmtu < ifp->if_mtu) 857 in6_maxmtu = ifp->if_mtu; 858 859 if (in6_ifstat[ifp->if_index] == NULL) { 860 in6_ifstat[ifp->if_index] = (struct in6_ifstat *) 861 malloc(sizeof(struct in6_ifstat), M_IFADDR, M_WAITOK); 862 bzero(in6_ifstat[ifp->if_index], sizeof(struct in6_ifstat)); 863 } 864 if (icmp6_ifstat[ifp->if_index] == NULL) { 865 icmp6_ifstat[ifp->if_index] = (struct icmp6_ifstat *) 866 malloc(sizeof(struct icmp6_ifstat), M_IFADDR, M_WAITOK); 867 bzero(icmp6_ifstat[ifp->if_index], sizeof(struct icmp6_ifstat)); 868 } 869 870 /* initialize NDP variables */ 871 nd6_ifattach(ifp); 872 } 873 874 /* 875 * NOTE: in6_ifdetach() does not support loopback if at this moment. 876 * We don't need this function in bsdi, because interfaces are never removed 877 * from the ifnet list in bsdi. 878 */ 879 void 880 in6_ifdetach(ifp) 881 struct ifnet *ifp; 882 { 883 struct in6_ifaddr *ia, *oia; 884 struct ifaddr *ifa, *next; 885 struct rtentry *rt; 886 short rtflags; 887 struct sockaddr_in6 sin6; 888 struct in6_multi *in6m; 889 struct in6_multi *in6m_next; 890 891 /* nuke prefix list. this may try to remove some of ifaddrs as well */ 892 in6_purgeprefix(ifp); 893 894 /* remove neighbor management table */ 895 nd6_purge(ifp); 896 897 /* nuke any of IPv6 addresses we have */ 898 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 899 { 900 next = ifa->ifa_list.tqe_next; 901 if (ifa->ifa_addr->sa_family != AF_INET6) 902 continue; 903 in6_purgeaddr(ifa); 904 } 905 906 /* undo everything done by in6_ifattach(), just in case */ 907 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 908 { 909 next = ifa->ifa_list.tqe_next; 910 911 912 if (ifa->ifa_addr->sa_family != AF_INET6 913 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 914 continue; 915 } 916 917 ia = (struct in6_ifaddr *)ifa; 918 919 /* remove from the routing table */ 920 if ((ia->ia_flags & IFA_ROUTE) 921 && (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 922 rtflags = rt->rt_flags; 923 rtfree(rt); 924 rtrequest(RTM_DELETE, 925 (struct sockaddr *)&ia->ia_addr, 926 (struct sockaddr *)&ia->ia_addr, 927 (struct sockaddr *)&ia->ia_prefixmask, 928 rtflags, (struct rtentry **)0); 929 } 930 931 /* remove from the linked list */ 932 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 933 IFAFREE(&ia->ia_ifa); 934 935 /* also remove from the IPv6 address chain(itojun&jinmei) */ 936 oia = ia; 937 if (oia == (ia = in6_ifaddr)) 938 in6_ifaddr = ia->ia_next; 939 else { 940 while (ia->ia_next && (ia->ia_next != oia)) 941 ia = ia->ia_next; 942 if (ia->ia_next) 943 ia->ia_next = oia->ia_next; 944 else { 945 nd6log((LOG_ERR, 946 "%s: didn't unlink in6ifaddr from " 947 "list\n", if_name(ifp))); 948 } 949 } 950 951 IFAFREE(&oia->ia_ifa); 952 } 953 954 /* leave from all multicast groups joined */ 955 in6_pcbpurgeif0(LIST_FIRST(udbinfo.listhead), ifp); 956 in6_pcbpurgeif0(LIST_FIRST(ripcbinfo.listhead), ifp); 957 for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) { 958 in6m_next = LIST_NEXT(in6m, in6m_entry); 959 if (in6m->in6m_ifp != ifp) 960 continue; 961 in6_delmulti(in6m); 962 in6m = NULL; 963 } 964 965 /* 966 * remove neighbor management table. we call it twice just to make 967 * sure we nuke everything. maybe we need just one call. 968 * XXX: since the first call did not release addresses, some prefixes 969 * might remain. We should call nd6_purge() again to release the 970 * prefixes after removing all addresses above. 971 * (Or can we just delay calling nd6_purge until at this point?) 972 */ 973 nd6_purge(ifp); 974 975 /* remove route to link-local allnodes multicast (ff02::1) */ 976 bzero(&sin6, sizeof(sin6)); 977 sin6.sin6_len = sizeof(struct sockaddr_in6); 978 sin6.sin6_family = AF_INET6; 979 sin6.sin6_addr = in6addr_linklocal_allnodes; 980 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 981 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 982 if (rt && rt->rt_ifp == ifp) { 983 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), 984 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 985 rtfree(rt); 986 } 987 } 988 989 void 990 in6_get_tmpifid(ifp, retbuf, baseid, generate) 991 struct ifnet *ifp; 992 u_int8_t *retbuf; 993 const u_int8_t *baseid; 994 int generate; 995 { 996 u_int8_t nullbuf[8]; 997 struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index]; 998 999 bzero(nullbuf, sizeof(nullbuf)); 1000 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 1001 /* we've never created a random ID. Create a new one. */ 1002 generate = 1; 1003 } 1004 1005 if (generate) { 1006 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 1007 1008 /* generate_tmp_ifid will update seedn and buf */ 1009 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 1010 ndi->randomid); 1011 } 1012 bcopy(ndi->randomid, retbuf, 8); 1013 } 1014 1015 void 1016 in6_tmpaddrtimer(ignored_arg) 1017 void *ignored_arg; 1018 { 1019 int i; 1020 struct nd_ifinfo *ndi; 1021 u_int8_t nullbuf[8]; 1022 int s = splnet(); 1023 1024 callout_reset(&in6_tmpaddrtimer_ch, 1025 (ip6_temp_preferred_lifetime - ip6_desync_factor - 1026 ip6_temp_regen_advance) * hz, 1027 in6_tmpaddrtimer, NULL); 1028 1029 bzero(nullbuf, sizeof(nullbuf)); 1030 for (i = 1; i < if_index + 1; i++) { 1031 ndi = &nd_ifinfo[i]; 1032 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 1033 /* 1034 * We've been generating a random ID on this interface. 1035 * Create a new one. 1036 */ 1037 (void)generate_tmp_ifid(ndi->randomseed0, 1038 ndi->randomseed1, 1039 ndi->randomid); 1040 } 1041 } 1042 1043 splx(s); 1044 } 1045