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 1.8 2004/09/19 22:32:48 joerg 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(struct ifnet *ifp, 108 struct in6_addr *in6) /* upper 64bits are preserved */ 109 { 110 MD5_CTX ctxt; 111 u_int8_t digest[16]; 112 int hostnamelen = strlen(hostname); 113 114 #if 0 115 /* we need at least several letters as seed for ifid */ 116 if (hostnamelen < 3) 117 return -1; 118 #endif 119 120 /* generate 8 bytes of pseudo-random value. */ 121 bzero(&ctxt, sizeof(ctxt)); 122 MD5Init(&ctxt); 123 MD5Update(&ctxt, hostname, hostnamelen); 124 MD5Final(digest, &ctxt); 125 126 /* assumes sizeof(digest) > sizeof(ifid) */ 127 bcopy(digest, &in6->s6_addr[8], 8); 128 129 /* make sure to set "u" bit to local, and "g" bit to individual. */ 130 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 131 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 132 133 /* convert EUI64 into IPv6 interface identifier */ 134 EUI64_TO_IFID(in6); 135 136 return 0; 137 } 138 139 static int 140 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 141 { 142 MD5_CTX ctxt; 143 u_int8_t seed[16], digest[16], nullbuf[8]; 144 u_int32_t val32; 145 struct timeval tv; 146 147 /* If there's no hisotry, start with a random seed. */ 148 bzero(nullbuf, sizeof(nullbuf)); 149 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 150 int i; 151 152 for (i = 0; i < 2; i++) { 153 microtime(&tv); 154 val32 = random() ^ tv.tv_usec; 155 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 156 } 157 } else { 158 bcopy(seed0, seed, 8); 159 } 160 161 /* copy the right-most 64-bits of the given address */ 162 /* XXX assumption on the size of IFID */ 163 bcopy(seed1, &seed[8], 8); 164 165 if (0) { /* for debugging purposes only */ 166 int i; 167 168 printf("generate_tmp_ifid: new randomized ID from: "); 169 for (i = 0; i < 16; i++) 170 printf("%02x", seed[i]); 171 printf(" "); 172 } 173 174 /* generate 16 bytes of pseudo-random value. */ 175 bzero(&ctxt, sizeof(ctxt)); 176 MD5Init(&ctxt); 177 MD5Update(&ctxt, seed, sizeof(seed)); 178 MD5Final(digest, &ctxt); 179 180 /* 181 * RFC 3041 3.2.1. (3) 182 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 183 * left-most bit is numbered 0) to zero. 184 */ 185 bcopy(digest, ret, 8); 186 ret[0] &= ~EUI64_UBIT; 187 188 /* 189 * XXX: we'd like to ensure that the generated value is not zero 190 * for simplicity. If the caclculated digest happens to be zero, 191 * use a random non-zero value as the last resort. 192 */ 193 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 194 log(LOG_INFO, 195 "generate_tmp_ifid: computed MD5 value is zero.\n"); 196 197 microtime(&tv); 198 val32 = random() ^ tv.tv_usec; 199 val32 = 1 + (val32 % (0xffffffff - 1)); 200 } 201 202 /* 203 * RFC 3041 3.2.1. (4) 204 * Take the rightmost 64-bits of the MD5 digest and save them in 205 * stable storage as the history value to be used in the next 206 * iteration of the algorithm. 207 */ 208 bcopy(&digest[8], seed0, 8); 209 210 if (0) { /* for debugging purposes only */ 211 int i; 212 213 printf("to: "); 214 for (i = 0; i < 16; i++) 215 printf("%02x", digest[i]); 216 printf("\n"); 217 } 218 219 return 0; 220 } 221 222 /* 223 * Get interface identifier for the specified interface. 224 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 225 */ 226 static int 227 get_hw_ifid(struct ifnet *ifp, 228 struct in6_addr *in6) /* upper 64bits are preserved */ 229 { 230 struct ifaddr *ifa; 231 struct sockaddr_dl *sdl; 232 u_int8_t *addr; 233 size_t addrlen; 234 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 235 static u_int8_t allone[8] = 236 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 237 238 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 239 if (ifa->ifa_addr->sa_family != AF_LINK) 240 continue; 241 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 242 if (sdl == NULL) 243 continue; 244 if (sdl->sdl_alen == 0) 245 continue; 246 247 goto found; 248 } 249 250 return -1; 251 252 found: 253 addr = LLADDR(sdl); 254 addrlen = sdl->sdl_alen; 255 256 /* get EUI64 */ 257 switch (ifp->if_type) { 258 case IFT_ETHER: 259 case IFT_FDDI: 260 case IFT_ATM: 261 case IFT_IEEE1394: 262 #ifdef IFT_IEEE80211 263 case IFT_IEEE80211: 264 #endif 265 /* IEEE802/EUI64 cases - what others? */ 266 /* IEEE1394 uses 16byte length address starting with EUI64 */ 267 if (addrlen > 8) 268 addrlen = 8; 269 270 /* look at IEEE802/EUI64 only */ 271 if (addrlen != 8 && addrlen != 6) 272 return -1; 273 274 /* 275 * check for invalid MAC address - on bsdi, we see it a lot 276 * since wildboar configures all-zero MAC on pccard before 277 * card insertion. 278 */ 279 if (bcmp(addr, allzero, addrlen) == 0) 280 return -1; 281 if (bcmp(addr, allone, addrlen) == 0) 282 return -1; 283 284 /* make EUI64 address */ 285 if (addrlen == 8) 286 bcopy(addr, &in6->s6_addr[8], 8); 287 else if (addrlen == 6) { 288 in6->s6_addr[8] = addr[0]; 289 in6->s6_addr[9] = addr[1]; 290 in6->s6_addr[10] = addr[2]; 291 in6->s6_addr[11] = 0xff; 292 in6->s6_addr[12] = 0xfe; 293 in6->s6_addr[13] = addr[3]; 294 in6->s6_addr[14] = addr[4]; 295 in6->s6_addr[15] = addr[5]; 296 } 297 break; 298 299 case IFT_ARCNET: 300 if (addrlen != 1) 301 return -1; 302 if (!addr[0]) 303 return -1; 304 305 bzero(&in6->s6_addr[8], 8); 306 in6->s6_addr[15] = addr[0]; 307 308 /* 309 * due to insufficient bitwidth, we mark it local. 310 */ 311 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 312 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 313 break; 314 315 case IFT_GIF: 316 #ifdef IFT_STF 317 case IFT_STF: 318 #endif 319 /* 320 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 321 * however, IPv4 address is not very suitable as unique 322 * identifier source (can be renumbered). 323 * we don't do this. 324 */ 325 return -1; 326 327 default: 328 return -1; 329 } 330 331 /* sanity check: g bit must not indicate "group" */ 332 if (EUI64_GROUP(in6)) 333 return -1; 334 335 /* convert EUI64 into IPv6 interface identifier */ 336 EUI64_TO_IFID(in6); 337 338 /* 339 * sanity check: ifid must not be all zero, avoid conflict with 340 * subnet router anycast 341 */ 342 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 343 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 344 return -1; 345 } 346 347 return 0; 348 } 349 350 /* 351 * Get interface identifier for the specified interface. If it is not 352 * available on ifp0, borrow interface identifier from other information 353 * sources. 354 */ 355 static int 356 get_ifid(struct ifnet *ifp0, 357 struct ifnet *altifp, /* secondary EUI64 source */ 358 struct in6_addr *in6) 359 { 360 struct ifnet *ifp; 361 362 /* first, try to get it from the interface itself */ 363 if (get_hw_ifid(ifp0, in6) == 0) { 364 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 365 if_name(ifp0))); 366 goto success; 367 } 368 369 /* try secondary EUI64 source. this basically is for ATM PVC */ 370 if (altifp && get_hw_ifid(altifp, in6) == 0) { 371 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 372 if_name(ifp0), if_name(altifp))); 373 goto success; 374 } 375 376 /* next, try to get it from some other hardware interface */ 377 TAILQ_FOREACH(ifp, &ifnet, if_list) { 378 if (ifp == ifp0) 379 continue; 380 if (get_hw_ifid(ifp, in6) != 0) 381 continue; 382 383 /* 384 * to borrow ifid from other interface, ifid needs to be 385 * globally unique 386 */ 387 if (IFID_UNIVERSAL(in6)) { 388 nd6log((LOG_DEBUG, 389 "%s: borrow interface identifier from %s\n", 390 if_name(ifp0), if_name(ifp))); 391 goto success; 392 } 393 } 394 395 /* last resort: get from random number source */ 396 if (get_rand_ifid(ifp, in6) == 0) { 397 nd6log((LOG_DEBUG, 398 "%s: interface identifier generated by random number\n", 399 if_name(ifp0))); 400 goto success; 401 } 402 403 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 404 return -1; 405 406 success: 407 nd6log((LOG_INFO, "%s: ifid: " 408 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 409 if_name(ifp0), 410 in6->s6_addr[8], in6->s6_addr[9], 411 in6->s6_addr[10], in6->s6_addr[11], 412 in6->s6_addr[12], in6->s6_addr[13], 413 in6->s6_addr[14], in6->s6_addr[15])); 414 return 0; 415 } 416 417 static int 418 in6_ifattach_linklocal(struct ifnet *ifp, 419 struct ifnet *altifp) /* secondary EUI64 source */ 420 { 421 struct in6_ifaddr *ia; 422 struct in6_aliasreq ifra; 423 struct nd_prefix pr0; 424 int i, error; 425 426 /* 427 * configure link-local address. 428 */ 429 bzero(&ifra, sizeof(ifra)); 430 431 /* 432 * in6_update_ifa() does not use ifra_name, but we accurately set it 433 * for safety. 434 */ 435 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 436 437 ifra.ifra_addr.sin6_family = AF_INET6; 438 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 439 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 440 #ifdef SCOPEDROUTING 441 ifra.ifra_addr.sin6_addr.s6_addr16[1] = 0 442 #else 443 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); /* XXX */ 444 #endif 445 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 446 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 447 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 448 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 449 } else { 450 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 451 nd6log((LOG_ERR, 452 "%s: no ifid available\n", if_name(ifp))); 453 return -1; 454 } 455 } 456 #ifdef SCOPEDROUTING 457 ifra.ifra_addr.sin6_scope_id = 458 in6_addr2scopeid(ifp, &ifra.ifra_addr.sin6_addr); 459 #endif 460 461 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 462 ifra.ifra_prefixmask.sin6_family = AF_INET6; 463 ifra.ifra_prefixmask.sin6_addr = in6mask64; 464 #ifdef SCOPEDROUTING 465 /* take into accound the sin6_scope_id field for routing */ 466 ifra.ifra_prefixmask.sin6_scope_id = 0xffffffff; 467 #endif 468 /* link-local addresses should NEVER expire. */ 469 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 470 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 471 472 /* 473 * Do not let in6_update_ifa() do DAD, since we need a random delay 474 * before sending an NS at the first time the interface becomes up. 475 * Instead, in6_if_up() will start DAD with a proper random delay. 476 */ 477 ifra.ifra_flags |= IN6_IFF_NODAD; 478 479 /* 480 * Now call in6_update_ifa() to do a bunch of procedures to configure 481 * a link-local address. We can set NULL to the 3rd argument, because 482 * we know there's no other link-local address on the interface 483 * and therefore we are adding one (instead of updating one). 484 */ 485 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 486 /* 487 * XXX: When the interface does not support IPv6, this call 488 * would fail in the SIOCSIFADDR ioctl. I believe the 489 * notification is rather confusing in this case, so just 490 * supress it. (jinmei@kame.net 20010130) 491 */ 492 if (error != EAFNOSUPPORT) 493 log(LOG_NOTICE, "in6_ifattach_linklocal: failed to " 494 "configure a link-local address on %s " 495 "(errno=%d)\n", 496 if_name(ifp), error); 497 return(-1); 498 } 499 500 /* 501 * Adjust ia6_flags so that in6_if_up will perform DAD. 502 * XXX: Some P2P interfaces seem not to send packets just after 503 * becoming up, so we skip p2p interfaces for safety. 504 */ 505 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 506 #ifdef DIAGNOSTIC 507 if (!ia) { 508 panic("ia == NULL in in6_ifattach_linklocal"); 509 /* NOTREACHED */ 510 } 511 #endif 512 if (in6if_do_dad(ifp) && (ifp->if_flags & IFF_POINTOPOINT) == 0) { 513 ia->ia6_flags &= ~IN6_IFF_NODAD; 514 ia->ia6_flags |= IN6_IFF_TENTATIVE; 515 } 516 517 /* 518 * Make the link-local prefix (fe80::/64%link) as on-link. 519 * Since we'd like to manage prefixes separately from addresses, 520 * we make an ND6 prefix structure for the link-local prefix, 521 * and add it to the prefix list as a never-expire prefix. 522 * XXX: this change might affect some existing code base... 523 */ 524 bzero(&pr0, sizeof(pr0)); 525 pr0.ndpr_ifp = ifp; 526 /* this should be 64 at this moment. */ 527 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 528 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 529 pr0.ndpr_prefix = ifra.ifra_addr; 530 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 531 for (i = 0; i < 4; i++) { 532 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 533 in6mask64.s6_addr32[i]; 534 } 535 /* 536 * Initialize parameters. The link-local prefix must always be 537 * on-link, and its lifetimes never expire. 538 */ 539 pr0.ndpr_raf_onlink = 1; 540 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 541 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 542 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 543 /* 544 * Since there is no other link-local addresses, nd6_prefix_lookup() 545 * probably returns NULL. However, we cannot always expect the result. 546 * For example, if we first remove the (only) existing link-local 547 * address, and then reconfigure another one, the prefix is still 548 * valid with referring to the old link-local address. 549 */ 550 if (nd6_prefix_lookup(&pr0) == NULL) { 551 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 552 return(error); 553 } 554 555 return 0; 556 } 557 558 static int 559 in6_ifattach_loopback(struct ifnet *ifp) /* must be IFT_LOOP */ 560 { 561 struct in6_aliasreq ifra; 562 int error; 563 564 bzero(&ifra, sizeof(ifra)); 565 566 /* 567 * in6_update_ifa() does not use ifra_name, but we accurately set it 568 * for safety. 569 */ 570 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 571 572 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 573 ifra.ifra_prefixmask.sin6_family = AF_INET6; 574 ifra.ifra_prefixmask.sin6_addr = in6mask128; 575 576 /* 577 * Always initialize ia_dstaddr (= broadcast address) to loopback 578 * address. Follows IPv4 practice - see in_ifinit(). 579 */ 580 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 581 ifra.ifra_dstaddr.sin6_family = AF_INET6; 582 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 583 584 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 585 ifra.ifra_addr.sin6_family = AF_INET6; 586 ifra.ifra_addr.sin6_addr = in6addr_loopback; 587 588 /* the loopback address should NEVER expire. */ 589 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 590 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 591 592 /* we don't need to perform DAD on loopback interfaces. */ 593 ifra.ifra_flags |= IN6_IFF_NODAD; 594 595 /* skip registration to the prefix list. XXX should be temporary. */ 596 ifra.ifra_flags |= IN6_IFF_NOPFX; 597 598 /* 599 * We are sure that this is a newly assigned address, so we can set 600 * NULL to the 3rd arg. 601 */ 602 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 603 log(LOG_ERR, "in6_ifattach_loopback: failed to configure " 604 "the loopback address on %s (errno=%d)\n", 605 if_name(ifp), error); 606 return(-1); 607 } 608 609 return 0; 610 } 611 612 /* 613 * compute NI group address, based on the current hostname setting. 614 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 615 * 616 * when ifp == NULL, the caller is responsible for filling scopeid. 617 */ 618 int 619 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 620 struct in6_addr *in6) 621 { 622 const char *p; 623 u_char *q; 624 MD5_CTX ctxt; 625 u_int8_t digest[16]; 626 char l; 627 char n[64]; /* a single label must not exceed 63 chars */ 628 629 if (!namelen || !name) 630 return -1; 631 632 p = name; 633 while (p && *p && *p != '.' && p - name < namelen) 634 p++; 635 if (p - name > sizeof(n) - 1) 636 return -1; /* label too long */ 637 l = p - name; 638 strncpy(n, name, l); 639 n[(int)l] = '\0'; 640 for (q = n; *q; q++) { 641 if ('A' <= *q && *q <= 'Z') 642 *q = *q - 'A' + 'a'; 643 } 644 645 /* generate 8 bytes of pseudo-random value. */ 646 bzero(&ctxt, sizeof(ctxt)); 647 MD5Init(&ctxt); 648 MD5Update(&ctxt, &l, sizeof(l)); 649 MD5Update(&ctxt, n, l); 650 MD5Final(digest, &ctxt); 651 652 bzero(in6, sizeof(*in6)); 653 in6->s6_addr16[0] = htons(0xff02); 654 if (ifp) 655 in6->s6_addr16[1] = htons(ifp->if_index); 656 in6->s6_addr8[11] = 2; 657 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 658 659 return 0; 660 } 661 662 void 663 in6_nigroup_attach(const char *name, int namelen) 664 { 665 struct ifnet *ifp; 666 struct sockaddr_in6 mltaddr; 667 struct in6_multi *in6m; 668 int error; 669 670 bzero(&mltaddr, sizeof(mltaddr)); 671 mltaddr.sin6_family = AF_INET6; 672 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 673 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 674 return; 675 676 TAILQ_FOREACH(ifp, &ifnet, if_list) { 677 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 678 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 679 if (!in6m) { 680 if (!in6_addmulti(&mltaddr.sin6_addr, ifp, &error)) { 681 nd6log((LOG_ERR, "%s: failed to join %s " 682 "(errno=%d)\n", if_name(ifp), 683 ip6_sprintf(&mltaddr.sin6_addr), 684 error)); 685 } 686 } 687 } 688 } 689 690 void 691 in6_nigroup_detach(const char *name, int namelen) 692 { 693 struct ifnet *ifp; 694 struct sockaddr_in6 mltaddr; 695 struct in6_multi *in6m; 696 697 bzero(&mltaddr, sizeof(mltaddr)); 698 mltaddr.sin6_family = AF_INET6; 699 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 700 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 701 return; 702 703 TAILQ_FOREACH(ifp, &ifnet, if_list) { 704 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 705 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 706 if (in6m) 707 in6_delmulti(in6m); 708 } 709 } 710 711 /* 712 * XXX multiple loopback interface needs more care. for instance, 713 * nodelocal address needs to be configured onto only one of them. 714 * XXX multiple link-local address case 715 */ 716 void 717 in6_ifattach(struct ifnet *ifp, 718 struct ifnet *altifp) /* secondary EUI64 source */ 719 { 720 static size_t if_indexlim = 8; 721 struct in6_ifaddr *ia; 722 struct in6_addr in6; 723 724 /* some of the interfaces are inherently not IPv6 capable */ 725 switch (ifp->if_type) { 726 #ifdef IFT_BRIDGE /*OpenBSD 2.8*/ 727 case IFT_BRIDGE: 728 return; 729 #endif 730 case IFT_PFLOG: 731 case IFT_PFSYNC: 732 return; 733 } 734 735 /* 736 * We have some arrays that should be indexed by if_index. 737 * since if_index will grow dynamically, they should grow too. 738 * struct in6_ifstat **in6_ifstat 739 * struct icmp6_ifstat **icmp6_ifstat 740 */ 741 if (in6_ifstat == NULL || icmp6_ifstat == NULL || 742 if_index >= if_indexlim) { 743 size_t n; 744 caddr_t q; 745 size_t olim; 746 747 olim = if_indexlim; 748 while (if_index >= if_indexlim) 749 if_indexlim <<= 1; 750 751 /* grow in6_ifstat */ 752 n = if_indexlim * sizeof(struct in6_ifstat *); 753 q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK); 754 bzero(q, n); 755 if (in6_ifstat) { 756 bcopy((caddr_t)in6_ifstat, q, 757 olim * sizeof(struct in6_ifstat *)); 758 free((caddr_t)in6_ifstat, M_IFADDR); 759 } 760 in6_ifstat = (struct in6_ifstat **)q; 761 in6_ifstatmax = if_indexlim; 762 763 /* grow icmp6_ifstat */ 764 n = if_indexlim * sizeof(struct icmp6_ifstat *); 765 q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK); 766 bzero(q, n); 767 if (icmp6_ifstat) { 768 bcopy((caddr_t)icmp6_ifstat, q, 769 olim * sizeof(struct icmp6_ifstat *)); 770 free((caddr_t)icmp6_ifstat, M_IFADDR); 771 } 772 icmp6_ifstat = (struct icmp6_ifstat **)q; 773 icmp6_ifstatmax = if_indexlim; 774 } 775 776 /* initialize scope identifiers */ 777 scope6_ifattach(ifp); 778 779 /* 780 * quirks based on interface type 781 */ 782 switch (ifp->if_type) { 783 #ifdef IFT_STF 784 case IFT_STF: 785 /* 786 * 6to4 interface is a very special kind of beast. 787 * no multicast, no linklocal. RFC2529 specifies how to make 788 * linklocals for 6to4 interface, but there's no use and 789 * it is rather harmful to have one. 790 */ 791 goto statinit; 792 #endif 793 default: 794 break; 795 } 796 797 /* 798 * usually, we require multicast capability to the interface 799 */ 800 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 801 log(LOG_INFO, "in6_ifattach: " 802 "%s is not multicast capable, IPv6 not enabled\n", 803 if_name(ifp)); 804 return; 805 } 806 807 /* 808 * assign loopback address for loopback interface. 809 * XXX multiple loopback interface case. 810 */ 811 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 812 in6 = in6addr_loopback; 813 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 814 if (in6_ifattach_loopback(ifp) != 0) 815 return; 816 } 817 } 818 819 /* 820 * assign a link-local address, if there's none. 821 */ 822 if (ip6_auto_linklocal) { 823 ia = in6ifa_ifpforlinklocal(ifp, 0); 824 if (ia == NULL) { 825 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 826 /* linklocal address assigned */ 827 } else { 828 /* failed to assign linklocal address. bark? */ 829 } 830 } 831 } 832 833 #ifdef IFT_STF /* XXX */ 834 statinit: 835 #endif 836 837 /* update dynamically. */ 838 if (in6_maxmtu < ifp->if_mtu) 839 in6_maxmtu = ifp->if_mtu; 840 841 if (in6_ifstat[ifp->if_index] == NULL) { 842 in6_ifstat[ifp->if_index] = (struct in6_ifstat *) 843 malloc(sizeof(struct in6_ifstat), M_IFADDR, M_WAITOK); 844 bzero(in6_ifstat[ifp->if_index], sizeof(struct in6_ifstat)); 845 } 846 if (icmp6_ifstat[ifp->if_index] == NULL) { 847 icmp6_ifstat[ifp->if_index] = (struct icmp6_ifstat *) 848 malloc(sizeof(struct icmp6_ifstat), M_IFADDR, M_WAITOK); 849 bzero(icmp6_ifstat[ifp->if_index], sizeof(struct icmp6_ifstat)); 850 } 851 852 /* initialize NDP variables */ 853 nd6_ifattach(ifp); 854 } 855 856 /* 857 * NOTE: in6_ifdetach() does not support loopback if at this moment. 858 * We don't need this function in bsdi, because interfaces are never removed 859 * from the ifnet list in bsdi. 860 */ 861 void 862 in6_ifdetach(struct ifnet *ifp) 863 { 864 struct in6_ifaddr *ia, *oia; 865 struct ifaddr *ifa, *next; 866 struct rtentry *rt; 867 short rtflags; 868 struct sockaddr_in6 sin6; 869 struct in6_multi *in6m; 870 struct in6_multi *in6m_next; 871 872 /* nuke prefix list. this may try to remove some of ifaddrs as well */ 873 in6_purgeprefix(ifp); 874 875 /* remove neighbor management table */ 876 nd6_purge(ifp); 877 878 /* nuke any of IPv6 addresses we have */ 879 TAILQ_FOREACH_MUTABLE(ifa, &ifp->if_addrlist, ifa_list, next) 880 { 881 if (ifa->ifa_addr->sa_family != AF_INET6) 882 continue; 883 in6_purgeaddr(ifa); 884 } 885 886 /* undo everything done by in6_ifattach(), just in case */ 887 TAILQ_FOREACH_MUTABLE(ifa, &ifp->if_addrlist, ifa_list, next) { 888 if (ifa->ifa_addr->sa_family != AF_INET6 889 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 890 continue; 891 } 892 893 ia = (struct in6_ifaddr *)ifa; 894 895 /* remove from the routing table */ 896 if ((ia->ia_flags & IFA_ROUTE) 897 && (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 898 rtflags = rt->rt_flags; 899 rtfree(rt); 900 rtrequest(RTM_DELETE, 901 (struct sockaddr *)&ia->ia_addr, 902 (struct sockaddr *)&ia->ia_addr, 903 (struct sockaddr *)&ia->ia_prefixmask, 904 rtflags, (struct rtentry **)0); 905 } 906 907 /* remove from the linked list */ 908 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 909 IFAFREE(&ia->ia_ifa); 910 911 /* also remove from the IPv6 address chain(itojun&jinmei) */ 912 oia = ia; 913 if (oia == (ia = in6_ifaddr)) 914 in6_ifaddr = ia->ia_next; 915 else { 916 while (ia->ia_next && (ia->ia_next != oia)) 917 ia = ia->ia_next; 918 if (ia->ia_next) 919 ia->ia_next = oia->ia_next; 920 else { 921 nd6log((LOG_ERR, 922 "%s: didn't unlink in6ifaddr from " 923 "list\n", if_name(ifp))); 924 } 925 } 926 927 IFAFREE(&oia->ia_ifa); 928 } 929 930 /* leave from all multicast groups joined */ 931 in6_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp); 932 in6_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp); 933 for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) { 934 in6m_next = LIST_NEXT(in6m, in6m_entry); 935 if (in6m->in6m_ifp != ifp) 936 continue; 937 in6_delmulti(in6m); 938 in6m = NULL; 939 } 940 941 /* 942 * remove neighbor management table. we call it twice just to make 943 * sure we nuke everything. maybe we need just one call. 944 * XXX: since the first call did not release addresses, some prefixes 945 * might remain. We should call nd6_purge() again to release the 946 * prefixes after removing all addresses above. 947 * (Or can we just delay calling nd6_purge until at this point?) 948 */ 949 nd6_purge(ifp); 950 951 /* remove route to link-local allnodes multicast (ff02::1) */ 952 bzero(&sin6, sizeof(sin6)); 953 sin6.sin6_len = sizeof(struct sockaddr_in6); 954 sin6.sin6_family = AF_INET6; 955 sin6.sin6_addr = in6addr_linklocal_allnodes; 956 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 957 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 958 if (rt && rt->rt_ifp == ifp) { 959 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), 960 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 961 rtfree(rt); 962 } 963 } 964 965 void 966 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, const u_int8_t *baseid, 967 int generate) 968 { 969 u_int8_t nullbuf[8]; 970 struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index]; 971 972 bzero(nullbuf, sizeof(nullbuf)); 973 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 974 /* we've never created a random ID. Create a new one. */ 975 generate = 1; 976 } 977 978 if (generate) { 979 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 980 981 /* generate_tmp_ifid will update seedn and buf */ 982 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 983 ndi->randomid); 984 } 985 bcopy(ndi->randomid, retbuf, 8); 986 } 987 988 void 989 in6_tmpaddrtimer(void *ignored_arg) 990 { 991 int i; 992 struct nd_ifinfo *ndi; 993 u_int8_t nullbuf[8]; 994 int s = splnet(); 995 996 callout_reset(&in6_tmpaddrtimer_ch, 997 (ip6_temp_preferred_lifetime - ip6_desync_factor - 998 ip6_temp_regen_advance) * hz, 999 in6_tmpaddrtimer, NULL); 1000 1001 bzero(nullbuf, sizeof(nullbuf)); 1002 for (i = 1; i < if_index + 1; i++) { 1003 ndi = &nd_ifinfo[i]; 1004 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 1005 /* 1006 * We've been generating a random ID on this interface. 1007 * Create a new one. 1008 */ 1009 (void)generate_tmp_ifid(ndi->randomseed0, 1010 ndi->randomseed1, 1011 ndi->randomid); 1012 } 1013 } 1014 1015 splx(s); 1016 } 1017