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 1.12 2005/02/01 16:09:37 hrs 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 unsigned long in6_maxmtu = 0; 65 66 #ifdef IP6_AUTO_LINKLOCAL 67 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; 68 #else 69 int ip6_auto_linklocal = 1; /* enable by default */ 70 #endif 71 72 struct callout in6_tmpaddrtimer_ch; 73 74 extern struct inpcbinfo udbinfo; 75 extern struct inpcbinfo ripcbinfo; 76 77 static int get_rand_ifid (struct ifnet *, struct in6_addr *); 78 static int generate_tmp_ifid (u_int8_t *, const u_int8_t *, u_int8_t *); 79 static int get_hw_ifid (struct ifnet *, struct in6_addr *); 80 static int get_ifid (struct ifnet *, struct ifnet *, struct in6_addr *); 81 static int in6_ifattach_linklocal (struct ifnet *, struct ifnet *); 82 static int in6_ifattach_loopback (struct ifnet *); 83 84 #define EUI64_GBIT 0x01 85 #define EUI64_UBIT 0x02 86 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 87 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 88 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 89 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 90 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 91 92 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 93 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 94 95 /* 96 * Generate a last-resort interface identifier, when the machine has no 97 * IEEE802/EUI64 address sources. 98 * The goal here is to get an interface identifier that is 99 * (1) random enough and (2) does not change across reboot. 100 * We currently use MD5(hostname) for it. 101 */ 102 static int 103 get_rand_ifid(struct ifnet *ifp, 104 struct in6_addr *in6) /* upper 64bits are preserved */ 105 { 106 MD5_CTX ctxt; 107 u_int8_t digest[16]; 108 int hostnamelen = strlen(hostname); 109 110 #if 0 111 /* we need at least several letters as seed for ifid */ 112 if (hostnamelen < 3) 113 return -1; 114 #endif 115 116 /* generate 8 bytes of pseudo-random value. */ 117 bzero(&ctxt, sizeof(ctxt)); 118 MD5Init(&ctxt); 119 MD5Update(&ctxt, hostname, hostnamelen); 120 MD5Final(digest, &ctxt); 121 122 /* assumes sizeof(digest) > sizeof(ifid) */ 123 bcopy(digest, &in6->s6_addr[8], 8); 124 125 /* make sure to set "u" bit to local, and "g" bit to individual. */ 126 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 127 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 128 129 /* convert EUI64 into IPv6 interface identifier */ 130 EUI64_TO_IFID(in6); 131 132 return 0; 133 } 134 135 static int 136 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 137 { 138 MD5_CTX ctxt; 139 u_int8_t seed[16], digest[16], nullbuf[8]; 140 u_int32_t val32; 141 struct timeval tv; 142 143 /* If there's no hisotry, start with a random seed. */ 144 bzero(nullbuf, sizeof(nullbuf)); 145 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 146 int i; 147 148 for (i = 0; i < 2; i++) { 149 microtime(&tv); 150 val32 = random() ^ tv.tv_usec; 151 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 152 } 153 } else { 154 bcopy(seed0, seed, 8); 155 } 156 157 /* copy the right-most 64-bits of the given address */ 158 /* XXX assumption on the size of IFID */ 159 bcopy(seed1, &seed[8], 8); 160 161 if (0) { /* for debugging purposes only */ 162 int i; 163 164 printf("generate_tmp_ifid: new randomized ID from: "); 165 for (i = 0; i < 16; i++) 166 printf("%02x", seed[i]); 167 printf(" "); 168 } 169 170 /* generate 16 bytes of pseudo-random value. */ 171 bzero(&ctxt, sizeof(ctxt)); 172 MD5Init(&ctxt); 173 MD5Update(&ctxt, seed, sizeof(seed)); 174 MD5Final(digest, &ctxt); 175 176 /* 177 * RFC 3041 3.2.1. (3) 178 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 179 * left-most bit is numbered 0) to zero. 180 */ 181 bcopy(digest, ret, 8); 182 ret[0] &= ~EUI64_UBIT; 183 184 /* 185 * XXX: we'd like to ensure that the generated value is not zero 186 * for simplicity. If the caclculated digest happens to be zero, 187 * use a random non-zero value as the last resort. 188 */ 189 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 190 log(LOG_INFO, 191 "generate_tmp_ifid: computed MD5 value is zero.\n"); 192 193 microtime(&tv); 194 val32 = random() ^ tv.tv_usec; 195 val32 = 1 + (val32 % (0xffffffff - 1)); 196 } 197 198 /* 199 * RFC 3041 3.2.1. (4) 200 * Take the rightmost 64-bits of the MD5 digest and save them in 201 * stable storage as the history value to be used in the next 202 * iteration of the algorithm. 203 */ 204 bcopy(&digest[8], seed0, 8); 205 206 if (0) { /* for debugging purposes only */ 207 int i; 208 209 printf("to: "); 210 for (i = 0; i < 16; i++) 211 printf("%02x", digest[i]); 212 printf("\n"); 213 } 214 215 return 0; 216 } 217 218 /* 219 * Get interface identifier for the specified interface. 220 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 221 */ 222 static int 223 get_hw_ifid(struct ifnet *ifp, 224 struct in6_addr *in6) /* upper 64bits are preserved */ 225 { 226 struct ifaddr *ifa; 227 struct sockaddr_dl *sdl; 228 u_int8_t *addr; 229 size_t addrlen; 230 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 231 static u_int8_t allone[8] = 232 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 233 234 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 235 if (ifa->ifa_addr->sa_family != AF_LINK) 236 continue; 237 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 238 if (sdl == NULL) 239 continue; 240 if (sdl->sdl_alen == 0) 241 continue; 242 243 goto found; 244 } 245 246 return -1; 247 248 found: 249 addr = LLADDR(sdl); 250 addrlen = sdl->sdl_alen; 251 252 /* get EUI64 */ 253 switch (ifp->if_type) { 254 case IFT_ETHER: 255 case IFT_FDDI: 256 case IFT_ATM: 257 case IFT_IEEE1394: 258 #ifdef IFT_IEEE80211 259 case IFT_IEEE80211: 260 #endif 261 /* IEEE802/EUI64 cases - what others? */ 262 /* IEEE1394 uses 16byte length address starting with EUI64 */ 263 if (addrlen > 8) 264 addrlen = 8; 265 266 /* look at IEEE802/EUI64 only */ 267 if (addrlen != 8 && addrlen != 6) 268 return -1; 269 270 /* 271 * check for invalid MAC address - on bsdi, we see it a lot 272 * since wildboar configures all-zero MAC on pccard before 273 * card insertion. 274 */ 275 if (bcmp(addr, allzero, addrlen) == 0) 276 return -1; 277 if (bcmp(addr, allone, addrlen) == 0) 278 return -1; 279 280 /* make EUI64 address */ 281 if (addrlen == 8) 282 bcopy(addr, &in6->s6_addr[8], 8); 283 else if (addrlen == 6) { 284 in6->s6_addr[8] = addr[0]; 285 in6->s6_addr[9] = addr[1]; 286 in6->s6_addr[10] = addr[2]; 287 in6->s6_addr[11] = 0xff; 288 in6->s6_addr[12] = 0xfe; 289 in6->s6_addr[13] = addr[3]; 290 in6->s6_addr[14] = addr[4]; 291 in6->s6_addr[15] = addr[5]; 292 } 293 break; 294 295 case IFT_ARCNET: 296 if (addrlen != 1) 297 return -1; 298 if (!addr[0]) 299 return -1; 300 301 bzero(&in6->s6_addr[8], 8); 302 in6->s6_addr[15] = addr[0]; 303 304 /* 305 * due to insufficient bitwidth, we mark it local. 306 */ 307 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 308 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 309 break; 310 311 case IFT_GIF: 312 #ifdef IFT_STF 313 case IFT_STF: 314 #endif 315 /* 316 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 317 * however, IPv4 address is not very suitable as unique 318 * identifier source (can be renumbered). 319 * we don't do this. 320 */ 321 return -1; 322 323 default: 324 return -1; 325 } 326 327 /* sanity check: g bit must not indicate "group" */ 328 if (EUI64_GROUP(in6)) 329 return -1; 330 331 /* convert EUI64 into IPv6 interface identifier */ 332 EUI64_TO_IFID(in6); 333 334 /* 335 * sanity check: ifid must not be all zero, avoid conflict with 336 * subnet router anycast 337 */ 338 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 339 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 340 return -1; 341 } 342 343 return 0; 344 } 345 346 /* 347 * Get interface identifier for the specified interface. If it is not 348 * available on ifp0, borrow interface identifier from other information 349 * sources. 350 */ 351 static int 352 get_ifid(struct ifnet *ifp0, 353 struct ifnet *altifp, /* secondary EUI64 source */ 354 struct in6_addr *in6) 355 { 356 struct ifnet *ifp; 357 358 /* first, try to get it from the interface itself */ 359 if (get_hw_ifid(ifp0, in6) == 0) { 360 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 361 if_name(ifp0))); 362 goto success; 363 } 364 365 /* try secondary EUI64 source. this basically is for ATM PVC */ 366 if (altifp && get_hw_ifid(altifp, in6) == 0) { 367 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 368 if_name(ifp0), if_name(altifp))); 369 goto success; 370 } 371 372 /* next, try to get it from some other hardware interface */ 373 TAILQ_FOREACH(ifp, &ifnet, if_list) { 374 if (ifp == ifp0) 375 continue; 376 if (get_hw_ifid(ifp, in6) != 0) 377 continue; 378 379 /* 380 * to borrow ifid from other interface, ifid needs to be 381 * globally unique 382 */ 383 if (IFID_UNIVERSAL(in6)) { 384 nd6log((LOG_DEBUG, 385 "%s: borrow interface identifier from %s\n", 386 if_name(ifp0), if_name(ifp))); 387 goto success; 388 } 389 } 390 391 /* last resort: get from random number source */ 392 if (get_rand_ifid(ifp, in6) == 0) { 393 nd6log((LOG_DEBUG, 394 "%s: interface identifier generated by random number\n", 395 if_name(ifp0))); 396 goto success; 397 } 398 399 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 400 return -1; 401 402 success: 403 nd6log((LOG_INFO, "%s: ifid: " 404 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 405 if_name(ifp0), 406 in6->s6_addr[8], in6->s6_addr[9], 407 in6->s6_addr[10], in6->s6_addr[11], 408 in6->s6_addr[12], in6->s6_addr[13], 409 in6->s6_addr[14], in6->s6_addr[15])); 410 return 0; 411 } 412 413 static int 414 in6_ifattach_linklocal(struct ifnet *ifp, 415 struct ifnet *altifp) /* secondary EUI64 source */ 416 { 417 struct in6_ifaddr *ia; 418 struct in6_aliasreq ifra; 419 struct nd_prefix pr0; 420 int i, error; 421 422 /* 423 * configure link-local address. 424 */ 425 bzero(&ifra, sizeof(ifra)); 426 427 /* 428 * in6_update_ifa() does not use ifra_name, but we accurately set it 429 * for safety. 430 */ 431 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 432 433 ifra.ifra_addr.sin6_family = AF_INET6; 434 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 435 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 436 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); /* XXX */ 437 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 438 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 439 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 440 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 441 } else { 442 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 443 nd6log((LOG_ERR, 444 "%s: no ifid available\n", if_name(ifp))); 445 return -1; 446 } 447 } 448 449 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 450 ifra.ifra_prefixmask.sin6_family = AF_INET6; 451 ifra.ifra_prefixmask.sin6_addr = in6mask64; 452 453 /* link-local addresses should NEVER expire. */ 454 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 455 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 456 457 /* 458 * Do not let in6_update_ifa() do DAD, since we need a random delay 459 * before sending an NS at the first time the interface becomes up. 460 * Instead, in6_if_up() will start DAD with a proper random delay. 461 */ 462 ifra.ifra_flags |= IN6_IFF_NODAD; 463 464 /* 465 * Now call in6_update_ifa() to do a bunch of procedures to configure 466 * a link-local address. We can set NULL to the 3rd argument, because 467 * we know there's no other link-local address on the interface 468 * and therefore we are adding one (instead of updating one). 469 */ 470 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 471 /* 472 * XXX: When the interface does not support IPv6, this call 473 * would fail in the SIOCSIFADDR ioctl. I believe the 474 * notification is rather confusing in this case, so just 475 * supress it. (jinmei@kame.net 20010130) 476 */ 477 if (error != EAFNOSUPPORT) 478 log(LOG_NOTICE, "in6_ifattach_linklocal: failed to " 479 "configure a link-local address on %s " 480 "(errno=%d)\n", 481 if_name(ifp), error); 482 return(-1); 483 } 484 485 /* 486 * Adjust ia6_flags so that in6_if_up will perform DAD. 487 * XXX: Some P2P interfaces seem not to send packets just after 488 * becoming up, so we skip p2p interfaces for safety. 489 */ 490 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 491 #ifdef DIAGNOSTIC 492 if (!ia) { 493 panic("ia == NULL in in6_ifattach_linklocal"); 494 /* NOTREACHED */ 495 } 496 #endif 497 if (in6if_do_dad(ifp) && (ifp->if_flags & IFF_POINTOPOINT) == 0) { 498 ia->ia6_flags &= ~IN6_IFF_NODAD; 499 ia->ia6_flags |= IN6_IFF_TENTATIVE; 500 } 501 502 /* 503 * Make the link-local prefix (fe80::/64%link) as on-link. 504 * Since we'd like to manage prefixes separately from addresses, 505 * we make an ND6 prefix structure for the link-local prefix, 506 * and add it to the prefix list as a never-expire prefix. 507 * XXX: this change might affect some existing code base... 508 */ 509 bzero(&pr0, sizeof(pr0)); 510 pr0.ndpr_ifp = ifp; 511 /* this should be 64 at this moment. */ 512 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 513 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 514 pr0.ndpr_prefix = ifra.ifra_addr; 515 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 516 for (i = 0; i < 4; i++) { 517 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 518 in6mask64.s6_addr32[i]; 519 } 520 /* 521 * Initialize parameters. The link-local prefix must always be 522 * on-link, and its lifetimes never expire. 523 */ 524 pr0.ndpr_raf_onlink = 1; 525 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 526 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 527 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 528 /* 529 * Since there is no other link-local addresses, nd6_prefix_lookup() 530 * probably returns NULL. However, we cannot always expect the result. 531 * For example, if we first remove the (only) existing link-local 532 * address, and then reconfigure another one, the prefix is still 533 * valid with referring to the old link-local address. 534 */ 535 if (nd6_prefix_lookup(&pr0) == NULL) { 536 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 537 return(error); 538 } 539 540 return 0; 541 } 542 543 static int 544 in6_ifattach_loopback(struct ifnet *ifp) /* must be IFT_LOOP */ 545 { 546 struct in6_aliasreq ifra; 547 int error; 548 549 bzero(&ifra, sizeof(ifra)); 550 551 /* 552 * in6_update_ifa() does not use ifra_name, but we accurately set it 553 * for safety. 554 */ 555 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 556 557 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 558 ifra.ifra_prefixmask.sin6_family = AF_INET6; 559 ifra.ifra_prefixmask.sin6_addr = in6mask128; 560 561 /* 562 * Always initialize ia_dstaddr (= broadcast address) to loopback 563 * address. Follows IPv4 practice - see in_ifinit(). 564 */ 565 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 566 ifra.ifra_dstaddr.sin6_family = AF_INET6; 567 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 568 569 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 570 ifra.ifra_addr.sin6_family = AF_INET6; 571 ifra.ifra_addr.sin6_addr = in6addr_loopback; 572 573 /* the loopback address should NEVER expire. */ 574 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 575 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 576 577 /* we don't need to perform DAD on loopback interfaces. */ 578 ifra.ifra_flags |= IN6_IFF_NODAD; 579 580 /* skip registration to the prefix list. XXX should be temporary. */ 581 ifra.ifra_flags |= IN6_IFF_NOPFX; 582 583 /* 584 * We are sure that this is a newly assigned address, so we can set 585 * NULL to the 3rd arg. 586 */ 587 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 588 log(LOG_ERR, "in6_ifattach_loopback: failed to configure " 589 "the loopback address on %s (errno=%d)\n", 590 if_name(ifp), error); 591 return(-1); 592 } 593 594 return 0; 595 } 596 597 /* 598 * compute NI group address, based on the current hostname setting. 599 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 600 * 601 * when ifp == NULL, the caller is responsible for filling scopeid. 602 */ 603 int 604 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 605 struct in6_addr *in6) 606 { 607 const char *p; 608 u_char *q; 609 MD5_CTX ctxt; 610 u_int8_t digest[16]; 611 char l; 612 char n[64]; /* a single label must not exceed 63 chars */ 613 614 if (!namelen || !name) 615 return -1; 616 617 p = name; 618 while (p && *p && *p != '.' && p - name < namelen) 619 p++; 620 if (p - name > sizeof(n) - 1) 621 return -1; /* label too long */ 622 l = p - name; 623 strncpy(n, name, l); 624 n[(int)l] = '\0'; 625 for (q = n; *q; q++) { 626 if ('A' <= *q && *q <= 'Z') 627 *q = *q - 'A' + 'a'; 628 } 629 630 /* generate 8 bytes of pseudo-random value. */ 631 bzero(&ctxt, sizeof(ctxt)); 632 MD5Init(&ctxt); 633 MD5Update(&ctxt, &l, sizeof(l)); 634 MD5Update(&ctxt, n, l); 635 MD5Final(digest, &ctxt); 636 637 bzero(in6, sizeof(*in6)); 638 in6->s6_addr16[0] = htons(0xff02); 639 if (ifp) 640 in6->s6_addr16[1] = htons(ifp->if_index); 641 in6->s6_addr8[11] = 2; 642 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 643 644 return 0; 645 } 646 647 void 648 in6_nigroup_attach(const char *name, int namelen) 649 { 650 struct ifnet *ifp; 651 struct sockaddr_in6 mltaddr; 652 struct in6_multi *in6m; 653 int error; 654 655 bzero(&mltaddr, sizeof(mltaddr)); 656 mltaddr.sin6_family = AF_INET6; 657 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 658 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 659 return; 660 661 TAILQ_FOREACH(ifp, &ifnet, if_list) { 662 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 663 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 664 if (!in6m) { 665 if (!in6_addmulti(&mltaddr.sin6_addr, ifp, &error)) { 666 nd6log((LOG_ERR, "%s: failed to join %s " 667 "(errno=%d)\n", if_name(ifp), 668 ip6_sprintf(&mltaddr.sin6_addr), 669 error)); 670 } 671 } 672 } 673 } 674 675 void 676 in6_nigroup_detach(const char *name, int namelen) 677 { 678 struct ifnet *ifp; 679 struct sockaddr_in6 mltaddr; 680 struct in6_multi *in6m; 681 682 bzero(&mltaddr, sizeof(mltaddr)); 683 mltaddr.sin6_family = AF_INET6; 684 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 685 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 686 return; 687 688 TAILQ_FOREACH(ifp, &ifnet, if_list) { 689 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 690 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 691 if (in6m) 692 in6_delmulti(in6m); 693 } 694 } 695 696 /* 697 * XXX multiple loopback interface needs more care. for instance, 698 * nodelocal address needs to be configured onto only one of them. 699 * XXX multiple link-local address case 700 */ 701 void 702 in6_ifattach(struct ifnet *ifp, 703 struct ifnet *altifp) /* secondary EUI64 source */ 704 { 705 struct in6_ifaddr *ia; 706 struct in6_addr in6; 707 708 /* some of the interfaces are inherently not IPv6 capable */ 709 switch (ifp->if_type) { 710 #ifdef IFT_BRIDGE /*OpenBSD 2.8*/ 711 case IFT_BRIDGE: 712 return; 713 #endif 714 case IFT_PFLOG: 715 case IFT_PFSYNC: 716 return; 717 } 718 719 /* 720 * quirks based on interface type 721 */ 722 switch (ifp->if_type) { 723 #ifdef IFT_STF 724 case IFT_STF: 725 /* 726 * 6to4 interface is a very special kind of beast. 727 * no multicast, no linklocal. RFC2529 specifies how to make 728 * linklocals for 6to4 interface, but there's no use and 729 * it is rather harmful to have one. 730 */ 731 goto statinit; 732 #endif 733 default: 734 break; 735 } 736 737 /* 738 * usually, we require multicast capability to the interface 739 */ 740 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 741 log(LOG_INFO, "in6_ifattach: " 742 "%s is not multicast capable, IPv6 not enabled\n", 743 if_name(ifp)); 744 return; 745 } 746 747 /* 748 * assign loopback address for loopback interface. 749 * XXX multiple loopback interface case. 750 */ 751 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 752 in6 = in6addr_loopback; 753 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 754 if (in6_ifattach_loopback(ifp) != 0) 755 return; 756 } 757 } 758 759 /* 760 * assign a link-local address, if there's none. 761 */ 762 if (ip6_auto_linklocal) { 763 ia = in6ifa_ifpforlinklocal(ifp, 0); 764 if (ia == NULL) { 765 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 766 /* linklocal address assigned */ 767 } else { 768 /* failed to assign linklocal address. bark? */ 769 } 770 } 771 } 772 773 #ifdef IFT_STF /* XXX */ 774 statinit: 775 #endif 776 777 /* update dynamically. */ 778 if (in6_maxmtu < ifp->if_mtu) 779 in6_maxmtu = ifp->if_mtu; 780 } 781 782 /* 783 * NOTE: in6_ifdetach() does not support loopback if at this moment. 784 * We don't need this function in bsdi, because interfaces are never removed 785 * from the ifnet list in bsdi. 786 */ 787 void 788 in6_ifdetach(struct ifnet *ifp) 789 { 790 struct in6_ifaddr *ia, *oia; 791 struct ifaddr *ifa, *next; 792 struct rtentry *rt; 793 short rtflags; 794 struct sockaddr_in6 sin6; 795 struct in6_multi *in6m; 796 struct in6_multi *in6m_next; 797 798 /* nuke prefix list. this may try to remove some of ifaddrs as well */ 799 in6_purgeprefix(ifp); 800 801 /* remove neighbor management table */ 802 nd6_purge(ifp); 803 804 /* nuke any of IPv6 addresses we have */ 805 TAILQ_FOREACH_MUTABLE(ifa, &ifp->if_addrlist, ifa_list, next) 806 { 807 if (ifa->ifa_addr->sa_family != AF_INET6) 808 continue; 809 in6_purgeaddr(ifa); 810 } 811 812 /* undo everything done by in6_ifattach(), just in case */ 813 TAILQ_FOREACH_MUTABLE(ifa, &ifp->if_addrlist, ifa_list, next) { 814 if (ifa->ifa_addr->sa_family != AF_INET6 815 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 816 continue; 817 } 818 819 ia = (struct in6_ifaddr *)ifa; 820 821 /* remove from the routing table */ 822 if ((ia->ia_flags & IFA_ROUTE) && 823 (rt = rtpurelookup((struct sockaddr *)&ia->ia_addr))) { 824 rtflags = rt->rt_flags; 825 --rt->rt_refcnt; 826 rtrequest(RTM_DELETE, 827 (struct sockaddr *)&ia->ia_addr, 828 (struct sockaddr *)&ia->ia_addr, 829 (struct sockaddr *)&ia->ia_prefixmask, 830 rtflags, (struct rtentry **)0); 831 } 832 833 /* remove from the linked list */ 834 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 835 IFAFREE(&ia->ia_ifa); 836 837 /* also remove from the IPv6 address chain(itojun&jinmei) */ 838 oia = ia; 839 if (oia == (ia = in6_ifaddr)) 840 in6_ifaddr = ia->ia_next; 841 else { 842 while (ia->ia_next && (ia->ia_next != oia)) 843 ia = ia->ia_next; 844 if (ia->ia_next) 845 ia->ia_next = oia->ia_next; 846 else { 847 nd6log((LOG_ERR, 848 "%s: didn't unlink in6ifaddr from " 849 "list\n", if_name(ifp))); 850 } 851 } 852 853 IFAFREE(&oia->ia_ifa); 854 } 855 856 /* leave from all multicast groups joined */ 857 in6_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp); 858 in6_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp); 859 for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) { 860 in6m_next = LIST_NEXT(in6m, in6m_entry); 861 if (in6m->in6m_ifp != ifp) 862 continue; 863 in6_delmulti(in6m); 864 in6m = NULL; 865 } 866 867 /* 868 * remove neighbor management table. we call it twice just to make 869 * sure we nuke everything. maybe we need just one call. 870 * XXX: since the first call did not release addresses, some prefixes 871 * might remain. We should call nd6_purge() again to release the 872 * prefixes after removing all addresses above. 873 * (Or can we just delay calling nd6_purge until at this point?) 874 */ 875 nd6_purge(ifp); 876 877 /* remove route to link-local allnodes multicast (ff02::1) */ 878 bzero(&sin6, sizeof(sin6)); 879 sin6.sin6_len = sizeof(struct sockaddr_in6); 880 sin6.sin6_family = AF_INET6; 881 sin6.sin6_addr = in6addr_linklocal_allnodes; 882 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 883 rt = rtpurelookup((struct sockaddr *)&sin6); 884 if (rt != NULL && rt->rt_ifp == ifp) { 885 --rt->rt_refcnt; 886 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), 887 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 888 } 889 } 890 891 void 892 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, const u_int8_t *baseid, 893 int generate) 894 { 895 u_int8_t nullbuf[8]; 896 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 897 898 bzero(nullbuf, sizeof(nullbuf)); 899 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 900 /* we've never created a random ID. Create a new one. */ 901 generate = 1; 902 } 903 904 if (generate) { 905 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 906 907 /* generate_tmp_ifid will update seedn and buf */ 908 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 909 ndi->randomid); 910 } 911 bcopy(ndi->randomid, retbuf, 8); 912 } 913 914 void 915 in6_tmpaddrtimer(void *ignored_arg) 916 { 917 struct nd_ifinfo *ndi; 918 u_int8_t nullbuf[8]; 919 struct ifnet *ifp; 920 int s = splnet(); 921 922 callout_reset(&in6_tmpaddrtimer_ch, 923 (ip6_temp_preferred_lifetime - ip6_desync_factor - 924 ip6_temp_regen_advance) * hz, 925 in6_tmpaddrtimer, NULL); 926 927 bzero(nullbuf, sizeof(nullbuf)); 928 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 929 ndi = ND_IFINFO(ifp); 930 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 931 /* 932 * We've been generating a random ID on this interface. 933 * Create a new one. 934 */ 935 (void)generate_tmp_ifid(ndi->randomseed0, 936 ndi->randomseed1, 937 ndi->randomid); 938 } 939 } 940 941 splx(s); 942 } 943