1 /* $FreeBSD$ */ 2 /* $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/malloc.h> 36 #include <sys/socket.h> 37 #include <sys/sockio.h> 38 #include <sys/kernel.h> 39 #include <sys/syslog.h> 40 #include <sys/md5.h> 41 42 #include <net/if.h> 43 #include <net/if_dl.h> 44 #include <net/if_types.h> 45 #include <net/route.h> 46 47 #include <netinet/in.h> 48 #include <netinet/in_var.h> 49 #include <netinet/if_ether.h> 50 51 #include <netinet/ip6.h> 52 #include <netinet6/ip6_var.h> 53 #include <netinet6/in6_var.h> 54 #include <netinet6/in6_ifattach.h> 55 #include <netinet6/ip6_var.h> 56 #include <netinet6/nd6.h> 57 #include <netinet6/scope6_var.h> 58 59 #include <net/net_osdep.h> 60 61 struct in6_ifstat **in6_ifstat = NULL; 62 struct icmp6_ifstat **icmp6_ifstat = NULL; 63 size_t in6_ifstatmax = 0; 64 size_t icmp6_ifstatmax = 0; 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 static int get_rand_ifid __P((struct ifnet *, struct in6_addr *)); 76 static int generate_tmp_ifid __P((u_int8_t *, const u_int8_t *, u_int8_t *)); 77 static int get_hw_ifid __P((struct ifnet *, struct in6_addr *)); 78 static int get_ifid __P((struct ifnet *, struct ifnet *, struct in6_addr *)); 79 static int in6_ifattach_linklocal __P((struct ifnet *, struct ifnet *)); 80 static int in6_ifattach_loopback __P((struct ifnet *)); 81 82 #define EUI64_GBIT 0x01 83 #define EUI64_UBIT 0x02 84 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 85 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 86 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 87 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 88 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 89 90 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 91 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 92 93 /* 94 * Generate a last-resort interface identifier, when the machine has no 95 * IEEE802/EUI64 address sources. 96 * The goal here is to get an interface identifier that is 97 * (1) random enough and (2) does not change across reboot. 98 * We currently use MD5(hostname) for it. 99 */ 100 static int 101 get_rand_ifid(ifp, in6) 102 struct ifnet *ifp; 103 struct in6_addr *in6; /*upper 64bits are preserved */ 104 { 105 MD5_CTX ctxt; 106 u_int8_t digest[16]; 107 int hostnamelen = strlen(hostname); 108 109 #if 0 110 /* we need at least several letters as seed for ifid */ 111 if (hostnamelen < 3) 112 return -1; 113 #endif 114 115 /* generate 8 bytes of pseudo-random value. */ 116 bzero(&ctxt, sizeof(ctxt)); 117 MD5Init(&ctxt); 118 MD5Update(&ctxt, hostname, hostnamelen); 119 MD5Final(digest, &ctxt); 120 121 /* assumes sizeof(digest) > sizeof(ifid) */ 122 bcopy(digest, &in6->s6_addr[8], 8); 123 124 /* make sure to set "u" bit to local, and "g" bit to individual. */ 125 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 126 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 127 128 /* convert EUI64 into IPv6 interface identifier */ 129 EUI64_TO_IFID(in6); 130 131 return 0; 132 } 133 134 static int 135 generate_tmp_ifid(seed0, seed1, ret) 136 u_int8_t *seed0, *ret; 137 const u_int8_t *seed1; 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 /* 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(ifp, in6) 224 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 for (ifa = ifp->if_addrlist.tqh_first; 236 ifa; 237 ifa = ifa->ifa_list.tqe_next) 238 { 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(ifp0, altifp, in6) 357 struct ifnet *ifp0; 358 struct ifnet *altifp; /*secondary EUI64 source*/ 359 struct in6_addr *in6; 360 { 361 struct ifnet *ifp; 362 363 /* first, try to get it from the interface itself */ 364 if (get_hw_ifid(ifp0, in6) == 0) { 365 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 366 if_name(ifp0))); 367 goto success; 368 } 369 370 /* try secondary EUI64 source. this basically is for ATM PVC */ 371 if (altifp && get_hw_ifid(altifp, in6) == 0) { 372 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 373 if_name(ifp0), if_name(altifp))); 374 goto success; 375 } 376 377 /* next, try to get it from some other hardware interface */ 378 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) 379 { 380 if (ifp == ifp0) 381 continue; 382 if (get_hw_ifid(ifp, in6) != 0) 383 continue; 384 385 /* 386 * to borrow ifid from other interface, ifid needs to be 387 * globally unique 388 */ 389 if (IFID_UNIVERSAL(in6)) { 390 nd6log((LOG_DEBUG, 391 "%s: borrow interface identifier from %s\n", 392 if_name(ifp0), if_name(ifp))); 393 goto success; 394 } 395 } 396 397 /* last resort: get from random number source */ 398 if (get_rand_ifid(ifp, in6) == 0) { 399 nd6log((LOG_DEBUG, 400 "%s: interface identifier generated by random number\n", 401 if_name(ifp0))); 402 goto success; 403 } 404 405 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 406 return -1; 407 408 success: 409 nd6log((LOG_INFO, "%s: ifid: " 410 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 411 if_name(ifp0), 412 in6->s6_addr[8], in6->s6_addr[9], 413 in6->s6_addr[10], in6->s6_addr[11], 414 in6->s6_addr[12], in6->s6_addr[13], 415 in6->s6_addr[14], in6->s6_addr[15])); 416 return 0; 417 } 418 419 static int 420 in6_ifattach_linklocal(ifp, altifp) 421 struct ifnet *ifp; 422 struct ifnet *altifp; /* secondary EUI64 source */ 423 { 424 struct in6_ifaddr *ia; 425 struct in6_aliasreq ifra; 426 struct nd_prefix pr0; 427 int i, error; 428 429 /* 430 * configure link-local address. 431 */ 432 bzero(&ifra, sizeof(ifra)); 433 434 /* 435 * in6_update_ifa() does not use ifra_name, but we accurately set it 436 * for safety. 437 */ 438 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 439 440 ifra.ifra_addr.sin6_family = AF_INET6; 441 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 442 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 443 #ifdef SCOPEDROUTING 444 ifra.ifra_addr.sin6_addr.s6_addr16[1] = 0 445 #else 446 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); /* XXX */ 447 #endif 448 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 449 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 450 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 451 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 452 } else { 453 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 454 nd6log((LOG_ERR, 455 "%s: no ifid available\n", if_name(ifp))); 456 return -1; 457 } 458 } 459 #ifdef SCOPEDROUTING 460 ifra.ifra_addr.sin6_scope_id = 461 in6_addr2scopeid(ifp, &ifra.ifra_addr.sin6_addr); 462 #endif 463 464 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 465 ifra.ifra_prefixmask.sin6_family = AF_INET6; 466 ifra.ifra_prefixmask.sin6_addr = in6mask64; 467 #ifdef SCOPEDROUTING 468 /* take into accound the sin6_scope_id field for routing */ 469 ifra.ifra_prefixmask.sin6_scope_id = 0xffffffff; 470 #endif 471 /* link-local addresses should NEVER expire. */ 472 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 473 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 474 475 /* 476 * Do not let in6_update_ifa() do DAD, since we need a random delay 477 * before sending an NS at the first time the inteface becomes up. 478 * Instead, in6_if_up() will start DAD with a proper random delay. 479 */ 480 ifra.ifra_flags |= IN6_IFF_NODAD; 481 482 /* 483 * Now call in6_update_ifa() to do a bunch of procedures to configure 484 * a link-local address. We can set NULL to the 3rd argument, because 485 * we know there's no other link-local address on the interface. 486 */ 487 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 488 /* 489 * XXX: When the interface does not support IPv6, this call 490 * would fail in the SIOCSIFADDR ioctl. I believe the 491 * notification is rather confusing in this case, so just 492 * supress it. (jinmei@kame.net 20010130) 493 */ 494 if (error != EAFNOSUPPORT) 495 log(LOG_NOTICE, "in6_ifattach_linklocal: failed to " 496 "configure a link-local address on %s " 497 "(errno=%d)\n", 498 if_name(ifp), error); 499 return(-1); 500 } 501 502 /* 503 * Adjust ia6_flags so that in6_if_up will perform DAD. 504 * XXX: Some P2P interfaces seem not to send packets just after 505 * becoming up, so we skip p2p interfaces for safety. 506 */ 507 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 508 #ifdef DIAGNOSTIC 509 if (!ia) { 510 panic("ia == NULL in in6_ifattach_linklocal"); 511 /*NOTREACHED*/ 512 } 513 #endif 514 if (in6if_do_dad(ifp) && (ifp->if_flags & IFF_POINTOPOINT) == 0) { 515 ia->ia6_flags &= ~IN6_IFF_NODAD; 516 ia->ia6_flags |= IN6_IFF_TENTATIVE; 517 } 518 519 /* 520 * Make the link-local prefix (fe80::/64%link) as on-link. 521 * Since we'd like to manage prefixes separately from addresses, 522 * we make an ND6 prefix structure for the link-local prefix, 523 * and add it to the prefix list as a never-expire prefix. 524 * XXX: this change might affect some existing code base... 525 */ 526 bzero(&pr0, sizeof(pr0)); 527 pr0.ndpr_ifp = ifp; 528 /* this should be 64 at this moment. */ 529 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 530 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 531 pr0.ndpr_prefix = ifra.ifra_addr; 532 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 533 for (i = 0; i < 4; i++) { 534 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 535 in6mask64.s6_addr32[i]; 536 } 537 /* 538 * Initialize parameters. The link-local prefix must always be 539 * on-link, and its lifetimes never expire. 540 */ 541 pr0.ndpr_raf_onlink = 1; 542 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 543 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 544 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 545 /* 546 * Since there is no other link-local addresses, nd6_prefix_lookup() 547 * probably returns NULL. However, we cannot always expect the result. 548 * For example, if we first remove the (only) existing link-local 549 * address, and then reconfigure another one, the prefix is still 550 * valid with referring to the old link-local address. 551 */ 552 if (nd6_prefix_lookup(&pr0) == NULL) { 553 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 554 return(error); 555 } 556 557 return 0; 558 } 559 560 static int 561 in6_ifattach_loopback(ifp) 562 struct ifnet *ifp; /* must be IFT_LOOP */ 563 { 564 struct in6_aliasreq ifra; 565 int error; 566 567 bzero(&ifra, sizeof(ifra)); 568 569 /* 570 * in6_update_ifa() does not use ifra_name, but we accurately set it 571 * for safety. 572 */ 573 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 574 575 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 576 ifra.ifra_prefixmask.sin6_family = AF_INET6; 577 ifra.ifra_prefixmask.sin6_addr = in6mask128; 578 579 /* 580 * Always initialize ia_dstaddr (= broadcast address) to loopback 581 * address. Follows IPv4 practice - see in_ifinit(). 582 */ 583 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 584 ifra.ifra_dstaddr.sin6_family = AF_INET6; 585 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 586 587 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 588 ifra.ifra_addr.sin6_family = AF_INET6; 589 ifra.ifra_addr.sin6_addr = in6addr_loopback; 590 591 /* the loopback address should NEVER expire. */ 592 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 593 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 594 595 /* we don't need to perfrom DAD on loopback interfaces. */ 596 ifra.ifra_flags |= IN6_IFF_NODAD; 597 598 /* skip registration to the prefix list. XXX should be temporary. */ 599 ifra.ifra_flags |= IN6_IFF_NOPFX; 600 601 /* 602 * We can set NULL to the 3rd arg. See comments in 603 * in6_ifattach_linklocal(). 604 */ 605 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 606 log(LOG_ERR, "in6_ifattach_loopback: failed to configure " 607 "the loopback address on %s (errno=%d)\n", 608 if_name(ifp), error); 609 return(-1); 610 } 611 612 return 0; 613 } 614 615 /* 616 * compute NI group address, based on the current hostname setting. 617 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 618 * 619 * when ifp == NULL, the caller is responsible for filling scopeid. 620 */ 621 int 622 in6_nigroup(ifp, name, namelen, in6) 623 struct ifnet *ifp; 624 const char *name; 625 int namelen; 626 struct in6_addr *in6; 627 { 628 const char *p; 629 u_char *q; 630 MD5_CTX ctxt; 631 u_int8_t digest[16]; 632 char l; 633 char n[64]; /* a single label must not exceed 63 chars */ 634 635 if (!namelen || !name) 636 return -1; 637 638 p = name; 639 while (p && *p && *p != '.' && p - name < namelen) 640 p++; 641 if (p - name > sizeof(n) - 1) 642 return -1; /*label too long*/ 643 l = p - name; 644 strncpy(n, name, l); 645 n[(int)l] = '\0'; 646 for (q = n; *q; q++) { 647 if ('A' <= *q && *q <= 'Z') 648 *q = *q - 'A' + 'a'; 649 } 650 651 /* generate 8 bytes of pseudo-random value. */ 652 bzero(&ctxt, sizeof(ctxt)); 653 MD5Init(&ctxt); 654 MD5Update(&ctxt, &l, sizeof(l)); 655 MD5Update(&ctxt, n, l); 656 MD5Final(digest, &ctxt); 657 658 bzero(in6, sizeof(*in6)); 659 in6->s6_addr16[0] = htons(0xff02); 660 if (ifp) 661 in6->s6_addr16[1] = htons(ifp->if_index); 662 in6->s6_addr8[11] = 2; 663 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 664 665 return 0; 666 } 667 668 void 669 in6_nigroup_attach(name, namelen) 670 const char *name; 671 int namelen; 672 { 673 struct ifnet *ifp; 674 struct sockaddr_in6 mltaddr; 675 struct in6_multi *in6m; 676 int error; 677 678 bzero(&mltaddr, sizeof(mltaddr)); 679 mltaddr.sin6_family = AF_INET6; 680 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 681 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 682 return; 683 684 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) 685 { 686 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 687 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 688 if (!in6m) { 689 if (!in6_addmulti(&mltaddr.sin6_addr, ifp, &error)) { 690 nd6log((LOG_ERR, "%s: failed to join %s " 691 "(errno=%d)\n", if_name(ifp), 692 ip6_sprintf(&mltaddr.sin6_addr), 693 error)); 694 } 695 } 696 } 697 } 698 699 void 700 in6_nigroup_detach(name, namelen) 701 const char *name; 702 int namelen; 703 { 704 struct ifnet *ifp; 705 struct sockaddr_in6 mltaddr; 706 struct in6_multi *in6m; 707 708 bzero(&mltaddr, sizeof(mltaddr)); 709 mltaddr.sin6_family = AF_INET6; 710 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 711 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 712 return; 713 714 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) 715 { 716 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 717 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 718 if (in6m) 719 in6_delmulti(in6m); 720 } 721 } 722 723 /* 724 * XXX multiple loopback interface needs more care. for instance, 725 * nodelocal address needs to be configured onto only one of them. 726 * XXX multiple link-local address case 727 */ 728 void 729 in6_ifattach(ifp, altifp) 730 struct ifnet *ifp; 731 struct ifnet *altifp; /* secondary EUI64 source */ 732 { 733 static size_t if_indexlim = 8; 734 struct in6_ifaddr *ia; 735 struct in6_addr in6; 736 737 /* some of the interfaces are inherently not IPv6 capable */ 738 switch (ifp->if_type) { 739 #ifdef IFT_BRIDGE /*OpenBSD 2.8*/ 740 case IFT_BRIDGE: 741 return; 742 #endif 743 } 744 745 /* 746 * We have some arrays that should be indexed by if_index. 747 * since if_index will grow dynamically, they should grow too. 748 * struct in6_ifstat **in6_ifstat 749 * struct icmp6_ifstat **icmp6_ifstat 750 */ 751 if (in6_ifstat == NULL || icmp6_ifstat == NULL || 752 if_index >= if_indexlim) { 753 size_t n; 754 caddr_t q; 755 size_t olim; 756 757 olim = if_indexlim; 758 while (if_index >= if_indexlim) 759 if_indexlim <<= 1; 760 761 /* grow in6_ifstat */ 762 n = if_indexlim * sizeof(struct in6_ifstat *); 763 q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK); 764 bzero(q, n); 765 if (in6_ifstat) { 766 bcopy((caddr_t)in6_ifstat, q, 767 olim * sizeof(struct in6_ifstat *)); 768 free((caddr_t)in6_ifstat, M_IFADDR); 769 } 770 in6_ifstat = (struct in6_ifstat **)q; 771 in6_ifstatmax = if_indexlim; 772 773 /* grow icmp6_ifstat */ 774 n = if_indexlim * sizeof(struct icmp6_ifstat *); 775 q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK); 776 bzero(q, n); 777 if (icmp6_ifstat) { 778 bcopy((caddr_t)icmp6_ifstat, q, 779 olim * sizeof(struct icmp6_ifstat *)); 780 free((caddr_t)icmp6_ifstat, M_IFADDR); 781 } 782 icmp6_ifstat = (struct icmp6_ifstat **)q; 783 icmp6_ifstatmax = if_indexlim; 784 } 785 786 /* initialize scope identifiers */ 787 scope6_ifattach(ifp); 788 789 /* 790 * quirks based on interface type 791 */ 792 switch (ifp->if_type) { 793 #ifdef IFT_STF 794 case IFT_STF: 795 /* 796 * 6to4 interface is a very speical kind of beast. 797 * no multicast, no linklocal (based on 03 draft). 798 */ 799 goto statinit; 800 #endif 801 default: 802 break; 803 } 804 805 /* 806 * usually, we require multicast capability to the interface 807 */ 808 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 809 log(LOG_INFO, "in6_ifattach: " 810 "%s is not multicast capable, IPv6 not enabled\n", 811 if_name(ifp)); 812 return; 813 } 814 815 /* 816 * assign loopback address for loopback interface. 817 * XXX multiple loopback interface case. 818 */ 819 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 820 in6 = in6addr_loopback; 821 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 822 if (in6_ifattach_loopback(ifp) != 0) 823 return; 824 } 825 } 826 827 /* 828 * assign a link-local address, if there's none. 829 */ 830 if (ip6_auto_linklocal) { 831 ia = in6ifa_ifpforlinklocal(ifp, 0); 832 if (ia == NULL) { 833 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 834 /* linklocal address assigned */ 835 } else { 836 /* failed to assign linklocal address. bark? */ 837 } 838 } 839 } 840 841 #ifdef IFT_STF /* XXX */ 842 statinit: 843 #endif 844 845 /* update dynamically. */ 846 if (in6_maxmtu < ifp->if_mtu) 847 in6_maxmtu = ifp->if_mtu; 848 849 if (in6_ifstat[ifp->if_index] == NULL) { 850 in6_ifstat[ifp->if_index] = (struct in6_ifstat *) 851 malloc(sizeof(struct in6_ifstat), M_IFADDR, M_WAITOK); 852 bzero(in6_ifstat[ifp->if_index], sizeof(struct in6_ifstat)); 853 } 854 if (icmp6_ifstat[ifp->if_index] == NULL) { 855 icmp6_ifstat[ifp->if_index] = (struct icmp6_ifstat *) 856 malloc(sizeof(struct icmp6_ifstat), M_IFADDR, M_WAITOK); 857 bzero(icmp6_ifstat[ifp->if_index], sizeof(struct icmp6_ifstat)); 858 } 859 860 /* initialize NDP variables */ 861 nd6_ifattach(ifp); 862 } 863 864 /* 865 * NOTE: in6_ifdetach() does not support loopback if at this moment. 866 * We don't need this function in bsdi, because interfaces are never removed 867 * from the ifnet list in bsdi. 868 */ 869 void 870 in6_ifdetach(ifp) 871 struct ifnet *ifp; 872 { 873 struct in6_ifaddr *ia, *oia; 874 struct ifaddr *ifa, *next; 875 struct rtentry *rt; 876 short rtflags; 877 struct sockaddr_in6 sin6; 878 struct in6_multi *in6m; 879 struct in6_multi *in6m_next; 880 881 /* nuke prefix list. this may try to remove some of ifaddrs as well */ 882 in6_purgeprefix(ifp); 883 884 /* remove neighbor management table */ 885 nd6_purge(ifp); 886 887 /* nuke any of IPv6 addresses we have */ 888 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 889 { 890 next = ifa->ifa_list.tqe_next; 891 if (ifa->ifa_addr->sa_family != AF_INET6) 892 continue; 893 in6_purgeaddr(ifa); 894 } 895 896 /* undo everything done by in6_ifattach(), just in case */ 897 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 898 { 899 next = ifa->ifa_list.tqe_next; 900 901 902 if (ifa->ifa_addr->sa_family != AF_INET6 903 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 904 continue; 905 } 906 907 ia = (struct in6_ifaddr *)ifa; 908 909 /* remove from the routing table */ 910 if ((ia->ia_flags & IFA_ROUTE) 911 && (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 912 rtflags = rt->rt_flags; 913 rtfree(rt); 914 rtrequest(RTM_DELETE, 915 (struct sockaddr *)&ia->ia_addr, 916 (struct sockaddr *)&ia->ia_addr, 917 (struct sockaddr *)&ia->ia_prefixmask, 918 rtflags, (struct rtentry **)0); 919 } 920 921 /* remove from the linked list */ 922 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 923 IFAFREE(&ia->ia_ifa); 924 925 /* also remove from the IPv6 address chain(itojun&jinmei) */ 926 oia = ia; 927 if (oia == (ia = in6_ifaddr)) 928 in6_ifaddr = ia->ia_next; 929 else { 930 while (ia->ia_next && (ia->ia_next != oia)) 931 ia = ia->ia_next; 932 if (ia->ia_next) 933 ia->ia_next = oia->ia_next; 934 else { 935 nd6log((LOG_ERR, 936 "%s: didn't unlink in6ifaddr from " 937 "list\n", if_name(ifp))); 938 } 939 } 940 941 IFAFREE(&oia->ia_ifa); 942 } 943 944 /* leave from all multicast groups joined */ 945 for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) { 946 in6m_next = LIST_NEXT(in6m, in6m_entry); 947 if (in6m->in6m_ifp != ifp) 948 continue; 949 in6_delmulti(in6m); 950 in6m = NULL; 951 } 952 953 /* 954 * remove neighbor management table. we call it twice just to make 955 * sure we nuke everything. maybe we need just one call. 956 * XXX: since the first call did not release addresses, some prefixes 957 * might remain. We should call nd6_purge() again to release the 958 * prefixes after removing all addresses above. 959 * (Or can we just delay calling nd6_purge until at this point?) 960 */ 961 nd6_purge(ifp); 962 963 /* remove route to link-local allnodes multicast (ff02::1) */ 964 bzero(&sin6, sizeof(sin6)); 965 sin6.sin6_len = sizeof(struct sockaddr_in6); 966 sin6.sin6_family = AF_INET6; 967 sin6.sin6_addr = in6addr_linklocal_allnodes; 968 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 969 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 970 if (rt && rt->rt_ifp == ifp) { 971 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), 972 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 973 rtfree(rt); 974 } 975 } 976 977 void 978 in6_get_tmpifid(ifp, retbuf, baseid, generate) 979 struct ifnet *ifp; 980 u_int8_t *retbuf; 981 const u_int8_t *baseid; 982 int generate; 983 { 984 u_int8_t nullbuf[8]; 985 struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index]; 986 987 bzero(nullbuf, sizeof(nullbuf)); 988 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 989 /* we've never created a random ID. Create a new one. */ 990 generate = 1; 991 } 992 993 if (generate) { 994 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 995 996 /* generate_tmp_ifid will update seedn and buf */ 997 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 998 ndi->randomid); 999 } 1000 bcopy(ndi->randomid, retbuf, 8); 1001 } 1002 1003 void 1004 in6_tmpaddrtimer(ignored_arg) 1005 void *ignored_arg; 1006 { 1007 int i; 1008 struct nd_ifinfo *ndi; 1009 u_int8_t nullbuf[8]; 1010 int s = splnet(); 1011 1012 callout_reset(&in6_tmpaddrtimer_ch, 1013 (ip6_temp_preferred_lifetime - ip6_desync_factor - 1014 ip6_temp_regen_advance) * hz, 1015 in6_tmpaddrtimer, NULL); 1016 1017 bzero(nullbuf, sizeof(nullbuf)); 1018 for (i = 1; i < if_index + 1; i++) { 1019 ndi = &nd_ifinfo[i]; 1020 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 1021 /* 1022 * We've been generating a random ID on this interface. 1023 * Create a new one. 1024 */ 1025 (void)generate_tmp_ifid(ndi->randomseed0, 1026 ndi->randomseed1, 1027 ndi->randomid); 1028 } 1029 } 1030 1031 splx(s); 1032 } 1033