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 #include <netinet/in_pcb.h> 51 52 #include <netinet/ip6.h> 53 #include <netinet6/ip6_var.h> 54 #include <netinet6/in6_var.h> 55 #include <netinet6/in6_pcb.h> 56 #include <netinet6/in6_ifattach.h> 57 #include <netinet6/ip6_var.h> 58 #include <netinet6/nd6.h> 59 #include <netinet6/scope6_var.h> 60 61 #include <net/net_osdep.h> 62 63 unsigned long in6_maxmtu = 0; 64 65 #ifdef IP6_AUTO_LINKLOCAL 66 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; 67 #else 68 int ip6_auto_linklocal = 1; /* enable by default */ 69 #endif 70 71 struct callout in6_tmpaddrtimer_ch; 72 73 extern struct inpcbinfo udbinfo; 74 extern struct inpcbinfo ripcbinfo; 75 76 static int get_rand_ifid __P((struct ifnet *, struct in6_addr *)); 77 static int generate_tmp_ifid __P((u_int8_t *, const u_int8_t *, u_int8_t *)); 78 static int get_hw_ifid __P((struct ifnet *, struct in6_addr *)); 79 static int get_ifid __P((struct ifnet *, struct ifnet *, struct in6_addr *)); 80 static int in6_ifattach_linklocal __P((struct ifnet *, struct ifnet *)); 81 static int in6_ifattach_loopback __P((struct ifnet *)); 82 83 #define EUI64_GBIT 0x01 84 #define EUI64_UBIT 0x02 85 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 86 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 87 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 88 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 89 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 90 91 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 92 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 93 94 /* 95 * Generate a last-resort interface identifier, when the machine has no 96 * IEEE802/EUI64 address sources. 97 * The goal here is to get an interface identifier that is 98 * (1) random enough and (2) does not change across reboot. 99 * We currently use MD5(hostname) for it. 100 */ 101 static int 102 get_rand_ifid(ifp, in6) 103 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(seed0, seed1, ret) 137 u_int8_t *seed0, *ret; 138 const u_int8_t *seed1; 139 { 140 MD5_CTX ctxt; 141 u_int8_t seed[16], digest[16], nullbuf[8]; 142 u_int32_t val32; 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 val32 = arc4random(); 151 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 152 } 153 } else 154 bcopy(seed0, seed, 8); 155 156 /* copy the right-most 64-bits of the given address */ 157 /* XXX assumption on the size of IFID */ 158 bcopy(seed1, &seed[8], 8); 159 160 if (0) { /* for debugging purposes only */ 161 int i; 162 163 printf("generate_tmp_ifid: new randomized ID from: "); 164 for (i = 0; i < 16; i++) 165 printf("%02x", seed[i]); 166 printf(" "); 167 } 168 169 /* generate 16 bytes of pseudo-random value. */ 170 bzero(&ctxt, sizeof(ctxt)); 171 MD5Init(&ctxt); 172 MD5Update(&ctxt, seed, sizeof(seed)); 173 MD5Final(digest, &ctxt); 174 175 /* 176 * RFC 3041 3.2.1. (3) 177 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 178 * left-most bit is numbered 0) to zero. 179 */ 180 bcopy(digest, ret, 8); 181 ret[0] &= ~EUI64_UBIT; 182 183 /* 184 * XXX: we'd like to ensure that the generated value is not zero 185 * for simplicity. If the caclculated digest happens to be zero, 186 * use a random non-zero value as the last resort. 187 */ 188 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 189 log(LOG_INFO, 190 "generate_tmp_ifid: computed MD5 value is zero.\n"); 191 192 val32 = arc4random(); 193 val32 = 1 + (val32 % (0xffffffff - 1)); 194 } 195 196 /* 197 * RFC 3041 3.2.1. (4) 198 * Take the rightmost 64-bits of the MD5 digest and save them in 199 * stable storage as the history value to be used in the next 200 * iteration of the algorithm. 201 */ 202 bcopy(&digest[8], seed0, 8); 203 204 if (0) { /* for debugging purposes only */ 205 int i; 206 207 printf("to: "); 208 for (i = 0; i < 16; i++) 209 printf("%02x", digest[i]); 210 printf("\n"); 211 } 212 213 return 0; 214 } 215 216 /* 217 * Get interface identifier for the specified interface. 218 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 219 */ 220 static int 221 get_hw_ifid(ifp, in6) 222 struct ifnet *ifp; 223 struct in6_addr *in6; /* upper 64bits are preserved */ 224 { 225 struct ifaddr *ifa; 226 struct sockaddr_dl *sdl; 227 u_int8_t *addr; 228 size_t addrlen; 229 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 230 static u_int8_t allone[8] = 231 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 232 233 for (ifa = ifp->if_addrlist.tqh_first; 234 ifa; 235 ifa = ifa->ifa_list.tqe_next) { 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_ISO88025: 258 case IFT_ATM: 259 case IFT_IEEE1394: 260 #ifdef IFT_IEEE80211 261 case IFT_IEEE80211: 262 #endif 263 /* IEEE802/EUI64 cases - what others? */ 264 /* IEEE1394 uses 16byte length address starting with EUI64 */ 265 if (addrlen > 8) 266 addrlen = 8; 267 268 /* look at IEEE802/EUI64 only */ 269 if (addrlen != 8 && addrlen != 6) 270 return -1; 271 272 /* 273 * check for invalid MAC address - on bsdi, we see it a lot 274 * since wildboar configures all-zero MAC on pccard before 275 * card insertion. 276 */ 277 if (bcmp(addr, allzero, addrlen) == 0) 278 return -1; 279 if (bcmp(addr, allone, addrlen) == 0) 280 return -1; 281 282 /* make EUI64 address */ 283 if (addrlen == 8) 284 bcopy(addr, &in6->s6_addr[8], 8); 285 else if (addrlen == 6) { 286 in6->s6_addr[8] = addr[0]; 287 in6->s6_addr[9] = addr[1]; 288 in6->s6_addr[10] = addr[2]; 289 in6->s6_addr[11] = 0xff; 290 in6->s6_addr[12] = 0xfe; 291 in6->s6_addr[13] = addr[3]; 292 in6->s6_addr[14] = addr[4]; 293 in6->s6_addr[15] = addr[5]; 294 } 295 break; 296 297 case IFT_ARCNET: 298 if (addrlen != 1) 299 return -1; 300 if (!addr[0]) 301 return -1; 302 303 bzero(&in6->s6_addr[8], 8); 304 in6->s6_addr[15] = addr[0]; 305 306 /* 307 * due to insufficient bitwidth, we mark it local. 308 */ 309 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 310 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 311 break; 312 313 case IFT_GIF: 314 #ifdef IFT_STF 315 case IFT_STF: 316 #endif 317 /* 318 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 319 * however, IPv4 address is not very suitable as unique 320 * identifier source (can be renumbered). 321 * we don't do this. 322 */ 323 return -1; 324 325 default: 326 return -1; 327 } 328 329 /* sanity check: g bit must not indicate "group" */ 330 if (EUI64_GROUP(in6)) 331 return -1; 332 333 /* convert EUI64 into IPv6 interface identifier */ 334 EUI64_TO_IFID(in6); 335 336 /* 337 * sanity check: ifid must not be all zero, avoid conflict with 338 * subnet router anycast 339 */ 340 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 341 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 342 return -1; 343 } 344 345 return 0; 346 } 347 348 /* 349 * Get interface identifier for the specified interface. If it is not 350 * available on ifp0, borrow interface identifier from other information 351 * sources. 352 */ 353 static int 354 get_ifid(ifp0, altifp, in6) 355 struct ifnet *ifp0; 356 struct ifnet *altifp; /* secondary EUI64 source */ 357 struct in6_addr *in6; 358 { 359 struct ifnet *ifp; 360 361 /* first, try to get it from the interface itself */ 362 if (get_hw_ifid(ifp0, in6) == 0) { 363 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 364 if_name(ifp0))); 365 goto success; 366 } 367 368 /* try secondary EUI64 source. this basically is for ATM PVC */ 369 if (altifp && get_hw_ifid(altifp, in6) == 0) { 370 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 371 if_name(ifp0), if_name(altifp))); 372 goto success; 373 } 374 375 /* next, try to get it from some other hardware interface */ 376 IFNET_RLOCK(); 377 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) { 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 IFNET_RUNLOCK(); 392 goto success; 393 } 394 } 395 IFNET_RUNLOCK(); 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: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 410 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 411 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 412 in6->s6_addr[14], in6->s6_addr[15])); 413 return 0; 414 } 415 416 static int 417 in6_ifattach_linklocal(ifp, altifp) 418 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 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); /* XXX */ 441 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 442 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 443 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 444 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 445 } else { 446 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 447 nd6log((LOG_ERR, 448 "%s: no ifid available\n", if_name(ifp))); 449 return (-1); 450 } 451 } 452 453 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 454 ifra.ifra_prefixmask.sin6_family = AF_INET6; 455 ifra.ifra_prefixmask.sin6_addr = in6mask64; 456 /* link-local addresses should NEVER expire. */ 457 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 458 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 459 460 /* 461 * Do not let in6_update_ifa() do DAD, since we need a random delay 462 * before sending an NS at the first time the interface becomes up. 463 * Instead, in6_if_up() will start DAD with a proper random delay. 464 */ 465 ifra.ifra_flags |= IN6_IFF_NODAD; 466 467 /* 468 * Now call in6_update_ifa() to do a bunch of procedures to configure 469 * a link-local address. We can set NULL to the 3rd argument, because 470 * we know there's no other link-local address on the interface 471 * and therefore we are adding one (instead of updating one). 472 */ 473 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 474 /* 475 * XXX: When the interface does not support IPv6, this call 476 * would fail in the SIOCSIFADDR ioctl. I believe the 477 * notification is rather confusing in this case, so just 478 * suppress it. (jinmei@kame.net 20010130) 479 */ 480 if (error != EAFNOSUPPORT) 481 log(LOG_NOTICE, "in6_ifattach_linklocal: failed to " 482 "configure a link-local address on %s " 483 "(errno=%d)\n", 484 if_name(ifp), error); 485 return (-1); 486 } 487 488 /* 489 * Adjust ia6_flags so that in6_if_up will perform DAD. 490 * XXX: Some P2P interfaces seem not to send packets just after 491 * becoming up, so we skip p2p interfaces for safety. 492 */ 493 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 494 #ifdef DIAGNOSTIC 495 if (!ia) { 496 panic("ia == NULL in in6_ifattach_linklocal"); 497 /* NOTREACHED */ 498 } 499 #endif 500 if (in6if_do_dad(ifp) && (ifp->if_flags & IFF_POINTOPOINT) == 0) { 501 ia->ia6_flags &= ~IN6_IFF_NODAD; 502 ia->ia6_flags |= IN6_IFF_TENTATIVE; 503 } 504 505 /* 506 * Make the link-local prefix (fe80::%link/64) as on-link. 507 * Since we'd like to manage prefixes separately from addresses, 508 * we make an ND6 prefix structure for the link-local prefix, 509 * and add it to the prefix list as a never-expire prefix. 510 * XXX: this change might affect some existing code base... 511 */ 512 bzero(&pr0, sizeof(pr0)); 513 pr0.ndpr_ifp = ifp; 514 /* this should be 64 at this moment. */ 515 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 516 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 517 pr0.ndpr_prefix = ifra.ifra_addr; 518 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 519 for (i = 0; i < 4; i++) { 520 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 521 in6mask64.s6_addr32[i]; 522 } 523 /* 524 * Initialize parameters. The link-local prefix must always be 525 * on-link, and its lifetimes never expire. 526 */ 527 pr0.ndpr_raf_onlink = 1; 528 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 529 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 530 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 531 /* 532 * Since there is no other link-local addresses, nd6_prefix_lookup() 533 * probably returns NULL. However, we cannot always expect the result. 534 * For example, if we first remove the (only) existing link-local 535 * address, and then reconfigure another one, the prefix is still 536 * valid with referring to the old link-local address. 537 */ 538 if (nd6_prefix_lookup(&pr0) == NULL) { 539 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 540 return (error); 541 } 542 543 return 0; 544 } 545 546 static int 547 in6_ifattach_loopback(ifp) 548 struct ifnet *ifp; /* must be IFT_LOOP */ 549 { 550 struct in6_aliasreq ifra; 551 int error; 552 553 bzero(&ifra, sizeof(ifra)); 554 555 /* 556 * in6_update_ifa() does not use ifra_name, but we accurately set it 557 * for safety. 558 */ 559 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 560 561 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 562 ifra.ifra_prefixmask.sin6_family = AF_INET6; 563 ifra.ifra_prefixmask.sin6_addr = in6mask128; 564 565 /* 566 * Always initialize ia_dstaddr (= broadcast address) to loopback 567 * address. Follows IPv4 practice - see in_ifinit(). 568 */ 569 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 570 ifra.ifra_dstaddr.sin6_family = AF_INET6; 571 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 572 573 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 574 ifra.ifra_addr.sin6_family = AF_INET6; 575 ifra.ifra_addr.sin6_addr = in6addr_loopback; 576 577 /* the loopback address should NEVER expire. */ 578 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 579 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 580 581 /* we don't need to perform DAD on loopback interfaces. */ 582 ifra.ifra_flags |= IN6_IFF_NODAD; 583 584 /* skip registration to the prefix list. XXX should be temporary. */ 585 ifra.ifra_flags |= IN6_IFF_NOPFX; 586 587 /* 588 * We are sure that this is a newly assigned address, so we can set 589 * NULL to the 3rd arg. 590 */ 591 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 592 log(LOG_ERR, "in6_ifattach_loopback: failed to configure " 593 "the loopback address on %s (errno=%d)\n", 594 if_name(ifp), error); 595 return (-1); 596 } 597 598 return 0; 599 } 600 601 /* 602 * compute NI group address, based on the current hostname setting. 603 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 604 * 605 * when ifp == NULL, the caller is responsible for filling scopeid. 606 */ 607 int 608 in6_nigroup(ifp, name, namelen, in6) 609 struct ifnet *ifp; 610 const char *name; 611 int namelen; 612 struct in6_addr *in6; 613 { 614 const char *p; 615 u_char *q; 616 MD5_CTX ctxt; 617 u_int8_t digest[16]; 618 char l; 619 char n[64]; /* a single label must not exceed 63 chars */ 620 621 if (!namelen || !name) 622 return -1; 623 624 p = name; 625 while (p && *p && *p != '.' && p - name < namelen) 626 p++; 627 if (p - name > sizeof(n) - 1) 628 return -1; /* label too long */ 629 l = p - name; 630 strncpy(n, name, l); 631 n[(int)l] = '\0'; 632 for (q = n; *q; q++) { 633 if ('A' <= *q && *q <= 'Z') 634 *q = *q - 'A' + 'a'; 635 } 636 637 /* generate 8 bytes of pseudo-random value. */ 638 bzero(&ctxt, sizeof(ctxt)); 639 MD5Init(&ctxt); 640 MD5Update(&ctxt, &l, sizeof(l)); 641 MD5Update(&ctxt, n, l); 642 MD5Final(digest, &ctxt); 643 644 bzero(in6, sizeof(*in6)); 645 in6->s6_addr16[0] = htons(0xff02); 646 if (ifp) 647 in6->s6_addr16[1] = htons(ifp->if_index); 648 in6->s6_addr8[11] = 2; 649 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 650 651 return 0; 652 } 653 654 /* 655 * XXX multiple loopback interface needs more care. for instance, 656 * nodelocal address needs to be configured onto only one of them. 657 * XXX multiple link-local address case 658 */ 659 void 660 in6_ifattach(ifp, altifp) 661 struct ifnet *ifp; 662 struct ifnet *altifp; /* secondary EUI64 source */ 663 { 664 struct in6_ifaddr *ia; 665 struct in6_addr in6; 666 667 /* some of the interfaces are inherently not IPv6 capable */ 668 switch (ifp->if_type) { 669 #ifdef IFT_BRIDGE /* OpenBSD 2.8, NetBSD 1.6 */ 670 case IFT_BRIDGE: 671 #endif 672 case IFT_PFLOG: 673 case IFT_PFSYNC: 674 return; 675 } 676 677 /* 678 * quirks based on interface type 679 */ 680 switch (ifp->if_type) { 681 #ifdef IFT_STF 682 case IFT_STF: 683 /* 684 * 6to4 interface is a very special kind of beast. 685 * no multicast, no linklocal. RFC2529 specifies how to make 686 * linklocals for 6to4 interface, but there's no use and 687 * it is rather harmful to have one. 688 */ 689 goto statinit; 690 #endif 691 default: 692 break; 693 } 694 695 /* 696 * usually, we require multicast capability to the interface 697 */ 698 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 699 log(LOG_INFO, "in6_ifattach: " 700 "%s is not multicast capable, IPv6 not enabled\n", 701 if_name(ifp)); 702 return; 703 } 704 705 /* 706 * assign loopback address for loopback interface. 707 * XXX multiple loopback interface case. 708 */ 709 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 710 in6 = in6addr_loopback; 711 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 712 if (in6_ifattach_loopback(ifp) != 0) 713 return; 714 } 715 } 716 717 /* 718 * assign a link-local address, if there's none. 719 */ 720 if (ip6_auto_linklocal) { 721 ia = in6ifa_ifpforlinklocal(ifp, 0); 722 if (ia == NULL) { 723 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 724 /* linklocal address assigned */ 725 } else { 726 /* failed to assign linklocal address. bark? */ 727 } 728 } 729 } 730 731 #ifdef IFT_STF /* XXX */ 732 statinit: 733 #endif 734 735 /* update dynamically. */ 736 if (in6_maxmtu < ifp->if_mtu) 737 in6_maxmtu = ifp->if_mtu; 738 } 739 740 /* 741 * NOTE: in6_ifdetach() does not support loopback if at this moment. 742 * We don't need this function in bsdi, because interfaces are never removed 743 * from the ifnet list in bsdi. 744 */ 745 void 746 in6_ifdetach(ifp) 747 struct ifnet *ifp; 748 { 749 struct in6_ifaddr *ia, *oia; 750 struct ifaddr *ifa, *next; 751 struct rtentry *rt; 752 short rtflags; 753 struct sockaddr_in6 sin6; 754 struct in6_multi *in6m; 755 struct in6_multi *in6m_next; 756 757 /* remove neighbor management table */ 758 nd6_purge(ifp); 759 760 /* nuke any of IPv6 addresses we have */ 761 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) { 762 next = ifa->ifa_list.tqe_next; 763 if (ifa->ifa_addr->sa_family != AF_INET6) 764 continue; 765 in6_purgeaddr(ifa); 766 } 767 768 /* undo everything done by in6_ifattach(), just in case */ 769 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) { 770 next = ifa->ifa_list.tqe_next; 771 772 if (ifa->ifa_addr->sa_family != AF_INET6 773 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 774 continue; 775 } 776 777 ia = (struct in6_ifaddr *)ifa; 778 779 /* remove from the routing table */ 780 if ((ia->ia_flags & IFA_ROUTE) && 781 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 782 rtflags = rt->rt_flags; 783 rtfree(rt); 784 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 785 (struct sockaddr *)&ia->ia_addr, 786 (struct sockaddr *)&ia->ia_prefixmask, 787 rtflags, (struct rtentry **)0); 788 } 789 790 /* remove from the linked list */ 791 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 792 IFAFREE(&ia->ia_ifa); 793 794 /* also remove from the IPv6 address chain(itojun&jinmei) */ 795 oia = ia; 796 if (oia == (ia = in6_ifaddr)) 797 in6_ifaddr = ia->ia_next; 798 else { 799 while (ia->ia_next && (ia->ia_next != oia)) 800 ia = ia->ia_next; 801 if (ia->ia_next) 802 ia->ia_next = oia->ia_next; 803 else { 804 nd6log((LOG_ERR, 805 "%s: didn't unlink in6ifaddr from list\n", 806 if_name(ifp))); 807 } 808 } 809 810 IFAFREE(&oia->ia_ifa); 811 } 812 813 /* leave from all multicast groups joined */ 814 815 if (udbinfo.listhead != NULL) 816 in6_pcbpurgeif0(LIST_FIRST(udbinfo.listhead), ifp); 817 if (ripcbinfo.listhead != NULL) 818 in6_pcbpurgeif0(LIST_FIRST(ripcbinfo.listhead), ifp); 819 820 for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) { 821 in6m_next = LIST_NEXT(in6m, in6m_entry); 822 if (in6m->in6m_ifp != ifp) 823 continue; 824 in6_delmulti(in6m); 825 in6m = NULL; 826 } 827 828 /* 829 * remove neighbor management table. we call it twice just to make 830 * sure we nuke everything. maybe we need just one call. 831 * XXX: since the first call did not release addresses, some prefixes 832 * might remain. We should call nd6_purge() again to release the 833 * prefixes after removing all addresses above. 834 * (Or can we just delay calling nd6_purge until at this point?) 835 */ 836 nd6_purge(ifp); 837 838 /* remove route to link-local allnodes multicast (ff02::1) */ 839 bzero(&sin6, sizeof(sin6)); 840 sin6.sin6_len = sizeof(struct sockaddr_in6); 841 sin6.sin6_family = AF_INET6; 842 sin6.sin6_addr = in6addr_linklocal_allnodes; 843 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 844 /* XXX grab lock first to avoid LOR */ 845 if (rt_tables[AF_INET6] != NULL) { 846 RADIX_NODE_HEAD_LOCK(rt_tables[AF_INET6]); 847 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 848 if (rt) { 849 if (rt->rt_ifp == ifp) 850 rtexpunge(rt); 851 RTFREE_LOCKED(rt); 852 } 853 RADIX_NODE_HEAD_UNLOCK(rt_tables[AF_INET6]); 854 } 855 } 856 857 void 858 in6_get_tmpifid(ifp, retbuf, baseid, generate) 859 struct ifnet *ifp; 860 u_int8_t *retbuf; 861 const u_int8_t *baseid; 862 int generate; 863 { 864 u_int8_t nullbuf[8]; 865 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 866 867 bzero(nullbuf, sizeof(nullbuf)); 868 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 869 /* we've never created a random ID. Create a new one. */ 870 generate = 1; 871 } 872 873 if (generate) { 874 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 875 876 /* generate_tmp_ifid will update seedn and buf */ 877 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 878 ndi->randomid); 879 } 880 bcopy(ndi->randomid, retbuf, 8); 881 } 882 883 void 884 in6_tmpaddrtimer(ignored_arg) 885 void *ignored_arg; 886 { 887 struct nd_ifinfo *ndi; 888 u_int8_t nullbuf[8]; 889 struct ifnet *ifp; 890 int s = splnet(); 891 892 callout_reset(&in6_tmpaddrtimer_ch, 893 (ip6_temp_preferred_lifetime - ip6_desync_factor - 894 ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL); 895 896 bzero(nullbuf, sizeof(nullbuf)); 897 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 898 ndi = ND_IFINFO(ifp); 899 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 900 /* 901 * We've been generating a random ID on this interface. 902 * Create a new one. 903 */ 904 (void)generate_tmp_ifid(ndi->randomseed0, 905 ndi->randomseed1, ndi->randomid); 906 } 907 } 908 909 splx(s); 910 } 911