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 1.13 2005/06/03 19:56:08 eirikn 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 #include <sys/thread2.h> 43 44 #include <net/if.h> 45 #include <net/if_dl.h> 46 #include <net/if_types.h> 47 #include <net/route.h> 48 49 #include <netinet/in.h> 50 #include <netinet/in_var.h> 51 #include <netinet/if_ether.h> 52 #include <netinet/in_pcb.h> 53 54 #include <netinet/ip6.h> 55 #include <netinet6/ip6_var.h> 56 #include <netinet6/in6_var.h> 57 #include <netinet6/in6_pcb.h> 58 #include <netinet6/in6_ifattach.h> 59 #include <netinet6/ip6_var.h> 60 #include <netinet6/nd6.h> 61 #include <netinet6/scope6_var.h> 62 63 #include <net/net_osdep.h> 64 65 unsigned long in6_maxmtu = 0; 66 67 #ifdef IP6_AUTO_LINKLOCAL 68 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; 69 #else 70 int ip6_auto_linklocal = 1; /* enable by default */ 71 #endif 72 73 struct callout in6_tmpaddrtimer_ch; 74 75 extern struct inpcbinfo udbinfo; 76 extern struct inpcbinfo ripcbinfo; 77 78 static int get_rand_ifid (struct ifnet *, struct in6_addr *); 79 static int generate_tmp_ifid (u_int8_t *, const u_int8_t *, u_int8_t *); 80 static int get_hw_ifid (struct ifnet *, struct in6_addr *); 81 static int get_ifid (struct ifnet *, struct ifnet *, struct in6_addr *); 82 static int in6_ifattach_linklocal (struct ifnet *, struct ifnet *); 83 static int in6_ifattach_loopback (struct ifnet *); 84 85 #define EUI64_GBIT 0x01 86 #define EUI64_UBIT 0x02 87 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 88 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 89 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 90 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 91 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 92 93 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 94 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 95 96 /* 97 * Generate a last-resort interface identifier, when the machine has no 98 * IEEE802/EUI64 address sources. 99 * The goal here is to get an interface identifier that is 100 * (1) random enough and (2) does not change across reboot. 101 * We currently use MD5(hostname) for it. 102 */ 103 static int 104 get_rand_ifid(struct ifnet *ifp, 105 struct in6_addr *in6) /* upper 64bits are preserved */ 106 { 107 MD5_CTX ctxt; 108 u_int8_t digest[16]; 109 int hostnamelen = strlen(hostname); 110 111 #if 0 112 /* we need at least several letters as seed for ifid */ 113 if (hostnamelen < 3) 114 return -1; 115 #endif 116 117 /* generate 8 bytes of pseudo-random value. */ 118 bzero(&ctxt, sizeof(ctxt)); 119 MD5Init(&ctxt); 120 MD5Update(&ctxt, hostname, hostnamelen); 121 MD5Final(digest, &ctxt); 122 123 /* assumes sizeof(digest) > sizeof(ifid) */ 124 bcopy(digest, &in6->s6_addr[8], 8); 125 126 /* make sure to set "u" bit to local, and "g" bit to individual. */ 127 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 128 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 129 130 /* convert EUI64 into IPv6 interface identifier */ 131 EUI64_TO_IFID(in6); 132 133 return 0; 134 } 135 136 static int 137 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 138 { 139 MD5_CTX ctxt; 140 u_int8_t seed[16], digest[16], nullbuf[8]; 141 u_int32_t val32; 142 struct timeval tv; 143 144 /* If there's no hisotry, start with a random seed. */ 145 bzero(nullbuf, sizeof(nullbuf)); 146 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 147 int i; 148 149 for (i = 0; i < 2; i++) { 150 microtime(&tv); 151 val32 = random() ^ tv.tv_usec; 152 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 153 } 154 } else { 155 bcopy(seed0, seed, 8); 156 } 157 158 /* copy the right-most 64-bits of the given address */ 159 /* XXX assumption on the size of IFID */ 160 bcopy(seed1, &seed[8], 8); 161 162 if (0) { /* for debugging purposes only */ 163 int i; 164 165 printf("generate_tmp_ifid: new randomized ID from: "); 166 for (i = 0; i < 16; i++) 167 printf("%02x", seed[i]); 168 printf(" "); 169 } 170 171 /* generate 16 bytes of pseudo-random value. */ 172 bzero(&ctxt, sizeof(ctxt)); 173 MD5Init(&ctxt); 174 MD5Update(&ctxt, seed, sizeof(seed)); 175 MD5Final(digest, &ctxt); 176 177 /* 178 * RFC 3041 3.2.1. (3) 179 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 180 * left-most bit is numbered 0) to zero. 181 */ 182 bcopy(digest, ret, 8); 183 ret[0] &= ~EUI64_UBIT; 184 185 /* 186 * XXX: we'd like to ensure that the generated value is not zero 187 * for simplicity. If the caclculated digest happens to be zero, 188 * use a random non-zero value as the last resort. 189 */ 190 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 191 log(LOG_INFO, 192 "generate_tmp_ifid: computed MD5 value is zero.\n"); 193 194 microtime(&tv); 195 val32 = random() ^ tv.tv_usec; 196 val32 = 1 + (val32 % (0xffffffff - 1)); 197 } 198 199 /* 200 * RFC 3041 3.2.1. (4) 201 * Take the rightmost 64-bits of the MD5 digest and save them in 202 * stable storage as the history value to be used in the next 203 * iteration of the algorithm. 204 */ 205 bcopy(&digest[8], seed0, 8); 206 207 if (0) { /* for debugging purposes only */ 208 int i; 209 210 printf("to: "); 211 for (i = 0; i < 16; i++) 212 printf("%02x", digest[i]); 213 printf("\n"); 214 } 215 216 return 0; 217 } 218 219 /* 220 * Get interface identifier for the specified interface. 221 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 222 */ 223 static int 224 get_hw_ifid(struct ifnet *ifp, 225 struct in6_addr *in6) /* upper 64bits are preserved */ 226 { 227 struct ifaddr *ifa; 228 struct sockaddr_dl *sdl; 229 u_int8_t *addr; 230 size_t addrlen; 231 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 232 static u_int8_t allone[8] = 233 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 234 235 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 236 if (ifa->ifa_addr->sa_family != AF_LINK) 237 continue; 238 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 239 if (sdl == NULL) 240 continue; 241 if (sdl->sdl_alen == 0) 242 continue; 243 244 goto found; 245 } 246 247 return -1; 248 249 found: 250 addr = LLADDR(sdl); 251 addrlen = sdl->sdl_alen; 252 253 /* get EUI64 */ 254 switch (ifp->if_type) { 255 case IFT_ETHER: 256 case IFT_FDDI: 257 case IFT_ATM: 258 case IFT_IEEE1394: 259 #ifdef IFT_IEEE80211 260 case IFT_IEEE80211: 261 #endif 262 /* IEEE802/EUI64 cases - what others? */ 263 /* IEEE1394 uses 16byte length address starting with EUI64 */ 264 if (addrlen > 8) 265 addrlen = 8; 266 267 /* look at IEEE802/EUI64 only */ 268 if (addrlen != 8 && addrlen != 6) 269 return -1; 270 271 /* 272 * check for invalid MAC address - on bsdi, we see it a lot 273 * since wildboar configures all-zero MAC on pccard before 274 * card insertion. 275 */ 276 if (bcmp(addr, allzero, addrlen) == 0) 277 return -1; 278 if (bcmp(addr, allone, addrlen) == 0) 279 return -1; 280 281 /* make EUI64 address */ 282 if (addrlen == 8) 283 bcopy(addr, &in6->s6_addr[8], 8); 284 else if (addrlen == 6) { 285 in6->s6_addr[8] = addr[0]; 286 in6->s6_addr[9] = addr[1]; 287 in6->s6_addr[10] = addr[2]; 288 in6->s6_addr[11] = 0xff; 289 in6->s6_addr[12] = 0xfe; 290 in6->s6_addr[13] = addr[3]; 291 in6->s6_addr[14] = addr[4]; 292 in6->s6_addr[15] = addr[5]; 293 } 294 break; 295 296 case IFT_ARCNET: 297 if (addrlen != 1) 298 return -1; 299 if (!addr[0]) 300 return -1; 301 302 bzero(&in6->s6_addr[8], 8); 303 in6->s6_addr[15] = addr[0]; 304 305 /* 306 * due to insufficient bitwidth, we mark it local. 307 */ 308 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 309 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 310 break; 311 312 case IFT_GIF: 313 #ifdef IFT_STF 314 case IFT_STF: 315 #endif 316 /* 317 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 318 * however, IPv4 address is not very suitable as unique 319 * identifier source (can be renumbered). 320 * we don't do this. 321 */ 322 return -1; 323 324 default: 325 return -1; 326 } 327 328 /* sanity check: g bit must not indicate "group" */ 329 if (EUI64_GROUP(in6)) 330 return -1; 331 332 /* convert EUI64 into IPv6 interface identifier */ 333 EUI64_TO_IFID(in6); 334 335 /* 336 * sanity check: ifid must not be all zero, avoid conflict with 337 * subnet router anycast 338 */ 339 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 340 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 341 return -1; 342 } 343 344 return 0; 345 } 346 347 /* 348 * Get interface identifier for the specified interface. If it is not 349 * available on ifp0, borrow interface identifier from other information 350 * sources. 351 */ 352 static int 353 get_ifid(struct ifnet *ifp0, 354 struct ifnet *altifp, /* secondary EUI64 source */ 355 struct in6_addr *in6) 356 { 357 struct ifnet *ifp; 358 359 /* first, try to get it from the interface itself */ 360 if (get_hw_ifid(ifp0, in6) == 0) { 361 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 362 if_name(ifp0))); 363 goto success; 364 } 365 366 /* try secondary EUI64 source. this basically is for ATM PVC */ 367 if (altifp && get_hw_ifid(altifp, in6) == 0) { 368 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 369 if_name(ifp0), if_name(altifp))); 370 goto success; 371 } 372 373 /* next, try to get it from some other hardware interface */ 374 TAILQ_FOREACH(ifp, &ifnet, if_list) { 375 if (ifp == ifp0) 376 continue; 377 if (get_hw_ifid(ifp, in6) != 0) 378 continue; 379 380 /* 381 * to borrow ifid from other interface, ifid needs to be 382 * globally unique 383 */ 384 if (IFID_UNIVERSAL(in6)) { 385 nd6log((LOG_DEBUG, 386 "%s: borrow interface identifier from %s\n", 387 if_name(ifp0), if_name(ifp))); 388 goto success; 389 } 390 } 391 392 /* last resort: get from random number source */ 393 if (get_rand_ifid(ifp, in6) == 0) { 394 nd6log((LOG_DEBUG, 395 "%s: interface identifier generated by random number\n", 396 if_name(ifp0))); 397 goto success; 398 } 399 400 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 401 return -1; 402 403 success: 404 nd6log((LOG_INFO, "%s: ifid: " 405 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 406 if_name(ifp0), 407 in6->s6_addr[8], in6->s6_addr[9], 408 in6->s6_addr[10], in6->s6_addr[11], 409 in6->s6_addr[12], in6->s6_addr[13], 410 in6->s6_addr[14], in6->s6_addr[15])); 411 return 0; 412 } 413 414 static int 415 in6_ifattach_linklocal(struct ifnet *ifp, 416 struct ifnet *altifp) /* secondary EUI64 source */ 417 { 418 struct in6_ifaddr *ia; 419 struct in6_aliasreq ifra; 420 struct nd_prefix pr0; 421 int i, error; 422 423 /* 424 * configure link-local address. 425 */ 426 bzero(&ifra, sizeof(ifra)); 427 428 /* 429 * in6_update_ifa() does not use ifra_name, but we accurately set it 430 * for safety. 431 */ 432 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 433 434 ifra.ifra_addr.sin6_family = AF_INET6; 435 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 436 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 437 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); /* XXX */ 438 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 439 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 440 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 441 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 442 } else { 443 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 444 nd6log((LOG_ERR, 445 "%s: no ifid available\n", if_name(ifp))); 446 return -1; 447 } 448 } 449 450 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 451 ifra.ifra_prefixmask.sin6_family = AF_INET6; 452 ifra.ifra_prefixmask.sin6_addr = in6mask64; 453 454 /* link-local addresses should NEVER expire. */ 455 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 456 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 457 458 /* 459 * Do not let in6_update_ifa() do DAD, since we need a random delay 460 * before sending an NS at the first time the interface becomes up. 461 * Instead, in6_if_up() will start DAD with a proper random delay. 462 */ 463 ifra.ifra_flags |= IN6_IFF_NODAD; 464 465 /* 466 * Now call in6_update_ifa() to do a bunch of procedures to configure 467 * a link-local address. We can set NULL to the 3rd argument, because 468 * we know there's no other link-local address on the interface 469 * and therefore we are adding one (instead of updating one). 470 */ 471 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 472 /* 473 * XXX: When the interface does not support IPv6, this call 474 * would fail in the SIOCSIFADDR ioctl. I believe the 475 * notification is rather confusing in this case, so just 476 * supress it. (jinmei@kame.net 20010130) 477 */ 478 if (error != EAFNOSUPPORT) 479 log(LOG_NOTICE, "in6_ifattach_linklocal: failed to " 480 "configure a link-local address on %s " 481 "(errno=%d)\n", 482 if_name(ifp), error); 483 return(-1); 484 } 485 486 /* 487 * Adjust ia6_flags so that in6_if_up will perform DAD. 488 * XXX: Some P2P interfaces seem not to send packets just after 489 * becoming up, so we skip p2p interfaces for safety. 490 */ 491 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 492 #ifdef DIAGNOSTIC 493 if (!ia) { 494 panic("ia == NULL in in6_ifattach_linklocal"); 495 /* NOTREACHED */ 496 } 497 #endif 498 if (in6if_do_dad(ifp) && (ifp->if_flags & IFF_POINTOPOINT) == 0) { 499 ia->ia6_flags &= ~IN6_IFF_NODAD; 500 ia->ia6_flags |= IN6_IFF_TENTATIVE; 501 } 502 503 /* 504 * Make the link-local prefix (fe80::/64%link) as on-link. 505 * Since we'd like to manage prefixes separately from addresses, 506 * we make an ND6 prefix structure for the link-local prefix, 507 * and add it to the prefix list as a never-expire prefix. 508 * XXX: this change might affect some existing code base... 509 */ 510 bzero(&pr0, sizeof(pr0)); 511 pr0.ndpr_ifp = ifp; 512 /* this should be 64 at this moment. */ 513 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 514 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 515 pr0.ndpr_prefix = ifra.ifra_addr; 516 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 517 for (i = 0; i < 4; i++) { 518 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 519 in6mask64.s6_addr32[i]; 520 } 521 /* 522 * Initialize parameters. The link-local prefix must always be 523 * on-link, and its lifetimes never expire. 524 */ 525 pr0.ndpr_raf_onlink = 1; 526 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 527 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 528 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 529 /* 530 * Since there is no other link-local addresses, nd6_prefix_lookup() 531 * probably returns NULL. However, we cannot always expect the result. 532 * For example, if we first remove the (only) existing link-local 533 * address, and then reconfigure another one, the prefix is still 534 * valid with referring to the old link-local address. 535 */ 536 if (nd6_prefix_lookup(&pr0) == NULL) { 537 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 538 return(error); 539 } 540 541 return 0; 542 } 543 544 static int 545 in6_ifattach_loopback(struct ifnet *ifp) /* must be IFT_LOOP */ 546 { 547 struct in6_aliasreq ifra; 548 int error; 549 550 bzero(&ifra, sizeof(ifra)); 551 552 /* 553 * in6_update_ifa() does not use ifra_name, but we accurately set it 554 * for safety. 555 */ 556 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 557 558 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 559 ifra.ifra_prefixmask.sin6_family = AF_INET6; 560 ifra.ifra_prefixmask.sin6_addr = in6mask128; 561 562 /* 563 * Always initialize ia_dstaddr (= broadcast address) to loopback 564 * address. Follows IPv4 practice - see in_ifinit(). 565 */ 566 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 567 ifra.ifra_dstaddr.sin6_family = AF_INET6; 568 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 569 570 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 571 ifra.ifra_addr.sin6_family = AF_INET6; 572 ifra.ifra_addr.sin6_addr = in6addr_loopback; 573 574 /* the loopback address should NEVER expire. */ 575 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 576 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 577 578 /* we don't need to perform DAD on loopback interfaces. */ 579 ifra.ifra_flags |= IN6_IFF_NODAD; 580 581 /* skip registration to the prefix list. XXX should be temporary. */ 582 ifra.ifra_flags |= IN6_IFF_NOPFX; 583 584 /* 585 * We are sure that this is a newly assigned address, so we can set 586 * NULL to the 3rd arg. 587 */ 588 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 589 log(LOG_ERR, "in6_ifattach_loopback: failed to configure " 590 "the loopback address on %s (errno=%d)\n", 591 if_name(ifp), error); 592 return(-1); 593 } 594 595 return 0; 596 } 597 598 /* 599 * compute NI group address, based on the current hostname setting. 600 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 601 * 602 * when ifp == NULL, the caller is responsible for filling scopeid. 603 */ 604 int 605 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 606 struct in6_addr *in6) 607 { 608 const char *p; 609 u_char *q; 610 MD5_CTX ctxt; 611 u_int8_t digest[16]; 612 char l; 613 char n[64]; /* a single label must not exceed 63 chars */ 614 615 if (!namelen || !name) 616 return -1; 617 618 p = name; 619 while (p && *p && *p != '.' && p - name < namelen) 620 p++; 621 if (p - name > sizeof(n) - 1) 622 return -1; /* label too long */ 623 l = p - name; 624 strncpy(n, name, l); 625 n[(int)l] = '\0'; 626 for (q = n; *q; q++) { 627 if ('A' <= *q && *q <= 'Z') 628 *q = *q - 'A' + 'a'; 629 } 630 631 /* generate 8 bytes of pseudo-random value. */ 632 bzero(&ctxt, sizeof(ctxt)); 633 MD5Init(&ctxt); 634 MD5Update(&ctxt, &l, sizeof(l)); 635 MD5Update(&ctxt, n, l); 636 MD5Final(digest, &ctxt); 637 638 bzero(in6, sizeof(*in6)); 639 in6->s6_addr16[0] = htons(0xff02); 640 if (ifp) 641 in6->s6_addr16[1] = htons(ifp->if_index); 642 in6->s6_addr8[11] = 2; 643 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 644 645 return 0; 646 } 647 648 void 649 in6_nigroup_attach(const char *name, int namelen) 650 { 651 struct ifnet *ifp; 652 struct sockaddr_in6 mltaddr; 653 struct in6_multi *in6m; 654 int error; 655 656 bzero(&mltaddr, sizeof(mltaddr)); 657 mltaddr.sin6_family = AF_INET6; 658 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 659 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 660 return; 661 662 TAILQ_FOREACH(ifp, &ifnet, if_list) { 663 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 664 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 665 if (!in6m) { 666 if (!in6_addmulti(&mltaddr.sin6_addr, ifp, &error)) { 667 nd6log((LOG_ERR, "%s: failed to join %s " 668 "(errno=%d)\n", if_name(ifp), 669 ip6_sprintf(&mltaddr.sin6_addr), 670 error)); 671 } 672 } 673 } 674 } 675 676 void 677 in6_nigroup_detach(const char *name, int namelen) 678 { 679 struct ifnet *ifp; 680 struct sockaddr_in6 mltaddr; 681 struct in6_multi *in6m; 682 683 bzero(&mltaddr, sizeof(mltaddr)); 684 mltaddr.sin6_family = AF_INET6; 685 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 686 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 687 return; 688 689 TAILQ_FOREACH(ifp, &ifnet, if_list) { 690 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 691 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 692 if (in6m) 693 in6_delmulti(in6m); 694 } 695 } 696 697 /* 698 * XXX multiple loopback interface needs more care. for instance, 699 * nodelocal address needs to be configured onto only one of them. 700 * XXX multiple link-local address case 701 */ 702 void 703 in6_ifattach(struct ifnet *ifp, 704 struct ifnet *altifp) /* secondary EUI64 source */ 705 { 706 struct in6_ifaddr *ia; 707 struct in6_addr in6; 708 709 /* some of the interfaces are inherently not IPv6 capable */ 710 switch (ifp->if_type) { 711 #ifdef IFT_BRIDGE /*OpenBSD 2.8*/ 712 case IFT_BRIDGE: 713 return; 714 #endif 715 case IFT_PFLOG: 716 case IFT_PFSYNC: 717 return; 718 } 719 720 /* 721 * quirks based on interface type 722 */ 723 switch (ifp->if_type) { 724 #ifdef IFT_STF 725 case IFT_STF: 726 /* 727 * 6to4 interface is a very special kind of beast. 728 * no multicast, no linklocal. RFC2529 specifies how to make 729 * linklocals for 6to4 interface, but there's no use and 730 * it is rather harmful to have one. 731 */ 732 goto statinit; 733 #endif 734 default: 735 break; 736 } 737 738 /* 739 * usually, we require multicast capability to the interface 740 */ 741 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 742 log(LOG_INFO, "in6_ifattach: " 743 "%s is not multicast capable, IPv6 not enabled\n", 744 if_name(ifp)); 745 return; 746 } 747 748 /* 749 * assign loopback address for loopback interface. 750 * XXX multiple loopback interface case. 751 */ 752 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 753 in6 = in6addr_loopback; 754 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 755 if (in6_ifattach_loopback(ifp) != 0) 756 return; 757 } 758 } 759 760 /* 761 * assign a link-local address, if there's none. 762 */ 763 if (ip6_auto_linklocal) { 764 ia = in6ifa_ifpforlinklocal(ifp, 0); 765 if (ia == NULL) { 766 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 767 /* linklocal address assigned */ 768 } else { 769 /* failed to assign linklocal address. bark? */ 770 } 771 } 772 } 773 774 #ifdef IFT_STF /* XXX */ 775 statinit: 776 #endif 777 778 /* update dynamically. */ 779 if (in6_maxmtu < ifp->if_mtu) 780 in6_maxmtu = ifp->if_mtu; 781 } 782 783 /* 784 * NOTE: in6_ifdetach() does not support loopback if at this moment. 785 * We don't need this function in bsdi, because interfaces are never removed 786 * from the ifnet list in bsdi. 787 */ 788 void 789 in6_ifdetach(struct ifnet *ifp) 790 { 791 struct in6_ifaddr *ia, *oia; 792 struct ifaddr *ifa, *next; 793 struct rtentry *rt; 794 short rtflags; 795 struct sockaddr_in6 sin6; 796 struct in6_multi *in6m; 797 struct in6_multi *in6m_next; 798 799 /* nuke prefix list. this may try to remove some of ifaddrs as well */ 800 in6_purgeprefix(ifp); 801 802 /* remove neighbor management table */ 803 nd6_purge(ifp); 804 805 /* nuke any of IPv6 addresses we have */ 806 TAILQ_FOREACH_MUTABLE(ifa, &ifp->if_addrlist, ifa_list, next) 807 { 808 if (ifa->ifa_addr->sa_family != AF_INET6) 809 continue; 810 in6_purgeaddr(ifa); 811 } 812 813 /* undo everything done by in6_ifattach(), just in case */ 814 TAILQ_FOREACH_MUTABLE(ifa, &ifp->if_addrlist, ifa_list, next) { 815 if (ifa->ifa_addr->sa_family != AF_INET6 816 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 817 continue; 818 } 819 820 ia = (struct in6_ifaddr *)ifa; 821 822 /* remove from the routing table */ 823 if ((ia->ia_flags & IFA_ROUTE) && 824 (rt = rtpurelookup((struct sockaddr *)&ia->ia_addr))) { 825 rtflags = rt->rt_flags; 826 --rt->rt_refcnt; 827 rtrequest(RTM_DELETE, 828 (struct sockaddr *)&ia->ia_addr, 829 (struct sockaddr *)&ia->ia_addr, 830 (struct sockaddr *)&ia->ia_prefixmask, 831 rtflags, (struct rtentry **)0); 832 } 833 834 /* remove from the linked list */ 835 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 836 IFAFREE(&ia->ia_ifa); 837 838 /* also remove from the IPv6 address chain(itojun&jinmei) */ 839 oia = ia; 840 if (oia == (ia = in6_ifaddr)) 841 in6_ifaddr = ia->ia_next; 842 else { 843 while (ia->ia_next && (ia->ia_next != oia)) 844 ia = ia->ia_next; 845 if (ia->ia_next) 846 ia->ia_next = oia->ia_next; 847 else { 848 nd6log((LOG_ERR, 849 "%s: didn't unlink in6ifaddr from " 850 "list\n", if_name(ifp))); 851 } 852 } 853 854 IFAFREE(&oia->ia_ifa); 855 } 856 857 /* leave from all multicast groups joined */ 858 in6_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp); 859 in6_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp); 860 for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) { 861 in6m_next = LIST_NEXT(in6m, in6m_entry); 862 if (in6m->in6m_ifp != ifp) 863 continue; 864 in6_delmulti(in6m); 865 in6m = NULL; 866 } 867 868 /* 869 * remove neighbor management table. we call it twice just to make 870 * sure we nuke everything. maybe we need just one call. 871 * XXX: since the first call did not release addresses, some prefixes 872 * might remain. We should call nd6_purge() again to release the 873 * prefixes after removing all addresses above. 874 * (Or can we just delay calling nd6_purge until at this point?) 875 */ 876 nd6_purge(ifp); 877 878 /* remove route to link-local allnodes multicast (ff02::1) */ 879 bzero(&sin6, sizeof(sin6)); 880 sin6.sin6_len = sizeof(struct sockaddr_in6); 881 sin6.sin6_family = AF_INET6; 882 sin6.sin6_addr = in6addr_linklocal_allnodes; 883 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 884 rt = rtpurelookup((struct sockaddr *)&sin6); 885 if (rt != NULL && rt->rt_ifp == ifp) { 886 --rt->rt_refcnt; 887 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), 888 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 889 } 890 } 891 892 void 893 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, const u_int8_t *baseid, 894 int generate) 895 { 896 u_int8_t nullbuf[8]; 897 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 898 899 bzero(nullbuf, sizeof(nullbuf)); 900 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 901 /* we've never created a random ID. Create a new one. */ 902 generate = 1; 903 } 904 905 if (generate) { 906 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 907 908 /* generate_tmp_ifid will update seedn and buf */ 909 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 910 ndi->randomid); 911 } 912 bcopy(ndi->randomid, retbuf, 8); 913 } 914 915 void 916 in6_tmpaddrtimer(void *ignored_arg) 917 { 918 struct nd_ifinfo *ndi; 919 u_int8_t nullbuf[8]; 920 struct ifnet *ifp; 921 922 crit_enter(); 923 924 callout_reset(&in6_tmpaddrtimer_ch, 925 (ip6_temp_preferred_lifetime - ip6_desync_factor - 926 ip6_temp_regen_advance) * hz, 927 in6_tmpaddrtimer, NULL); 928 929 bzero(nullbuf, sizeof(nullbuf)); 930 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 931 ndi = ND_IFINFO(ifp); 932 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 933 /* 934 * We've been generating a random ID on this interface. 935 * Create a new one. 936 */ 937 (void)generate_tmp_ifid(ndi->randomseed0, 938 ndi->randomseed1, 939 ndi->randomid); 940 } 941 } 942 943 crit_exit(); 944 } 945