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 unsigned long in6_maxmtu = 0; 62 63 #ifdef IP6_AUTO_LINKLOCAL 64 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; 65 #else 66 int ip6_auto_linklocal = 1; /* enable by default */ 67 #endif 68 69 struct callout in6_tmpaddrtimer_ch; 70 71 extern struct inpcbinfo udbinfo; 72 extern struct inpcbinfo ripcbinfo; 73 74 static int get_rand_ifid __P((struct ifnet *, struct in6_addr *)); 75 static int generate_tmp_ifid __P((u_int8_t *, const u_int8_t *, u_int8_t *)); 76 static int get_ifid __P((struct ifnet *, struct ifnet *, struct in6_addr *)); 77 static int in6_ifattach_linklocal __P((struct ifnet *, struct ifnet *)); 78 static int in6_ifattach_loopback __P((struct ifnet *)); 79 80 #define EUI64_GBIT 0x01 81 #define EUI64_UBIT 0x02 82 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 83 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 84 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 85 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 86 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 87 88 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 89 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 90 91 /* 92 * Generate a last-resort interface identifier, when the machine has no 93 * IEEE802/EUI64 address sources. 94 * The goal here is to get an interface identifier that is 95 * (1) random enough and (2) does not change across reboot. 96 * We currently use MD5(hostname) for it. 97 */ 98 static int 99 get_rand_ifid(ifp, in6) 100 struct ifnet *ifp; 101 struct in6_addr *in6; /* upper 64bits are preserved */ 102 { 103 MD5_CTX ctxt; 104 u_int8_t digest[16]; 105 int hostnamelen = strlen(hostname); 106 107 #if 0 108 /* we need at least several letters as seed for ifid */ 109 if (hostnamelen < 3) 110 return -1; 111 #endif 112 113 /* generate 8 bytes of pseudo-random value. */ 114 bzero(&ctxt, sizeof(ctxt)); 115 MD5Init(&ctxt); 116 MD5Update(&ctxt, hostname, hostnamelen); 117 MD5Final(digest, &ctxt); 118 119 /* assumes sizeof(digest) > sizeof(ifid) */ 120 bcopy(digest, &in6->s6_addr[8], 8); 121 122 /* make sure to set "u" bit to local, and "g" bit to individual. */ 123 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 124 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 125 126 /* convert EUI64 into IPv6 interface identifier */ 127 EUI64_TO_IFID(in6); 128 129 return 0; 130 } 131 132 static int 133 generate_tmp_ifid(seed0, seed1, ret) 134 u_int8_t *seed0, *ret; 135 const u_int8_t *seed1; 136 { 137 MD5_CTX ctxt; 138 u_int8_t seed[16], digest[16], nullbuf[8]; 139 u_int32_t val32; 140 141 /* If there's no hisotry, start with a random seed. */ 142 bzero(nullbuf, sizeof(nullbuf)); 143 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 144 int i; 145 146 for (i = 0; i < 2; i++) { 147 val32 = arc4random(); 148 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 149 } 150 } else 151 bcopy(seed0, seed, 8); 152 153 /* copy the right-most 64-bits of the given address */ 154 /* XXX assumption on the size of IFID */ 155 bcopy(seed1, &seed[8], 8); 156 157 if (0) { /* for debugging purposes only */ 158 int i; 159 160 printf("generate_tmp_ifid: new randomized ID from: "); 161 for (i = 0; i < 16; i++) 162 printf("%02x", seed[i]); 163 printf(" "); 164 } 165 166 /* generate 16 bytes of pseudo-random value. */ 167 bzero(&ctxt, sizeof(ctxt)); 168 MD5Init(&ctxt); 169 MD5Update(&ctxt, seed, sizeof(seed)); 170 MD5Final(digest, &ctxt); 171 172 /* 173 * RFC 3041 3.2.1. (3) 174 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 175 * left-most bit is numbered 0) to zero. 176 */ 177 bcopy(digest, ret, 8); 178 ret[0] &= ~EUI64_UBIT; 179 180 /* 181 * XXX: we'd like to ensure that the generated value is not zero 182 * for simplicity. If the caclculated digest happens to be zero, 183 * use a random non-zero value as the last resort. 184 */ 185 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 186 nd6log((LOG_INFO, 187 "generate_tmp_ifid: computed MD5 value is zero.\n")); 188 189 val32 = arc4random(); 190 val32 = 1 + (val32 % (0xffffffff - 1)); 191 } 192 193 /* 194 * RFC 3041 3.2.1. (4) 195 * Take the rightmost 64-bits of the MD5 digest and save them in 196 * stable storage as the history value to be used in the next 197 * iteration of the algorithm. 198 */ 199 bcopy(&digest[8], seed0, 8); 200 201 if (0) { /* for debugging purposes only */ 202 int i; 203 204 printf("to: "); 205 for (i = 0; i < 16; i++) 206 printf("%02x", digest[i]); 207 printf("\n"); 208 } 209 210 return 0; 211 } 212 213 /* 214 * Get interface identifier for the specified interface. 215 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 216 */ 217 int 218 in6_get_hw_ifid(ifp, in6) 219 struct ifnet *ifp; 220 struct in6_addr *in6; /* upper 64bits are preserved */ 221 { 222 struct ifaddr *ifa; 223 struct sockaddr_dl *sdl; 224 u_int8_t *addr; 225 size_t addrlen; 226 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 227 static u_int8_t allone[8] = 228 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 229 230 for (ifa = ifp->if_addrlist.tqh_first; 231 ifa; 232 ifa = ifa->ifa_list.tqe_next) { 233 if (ifa->ifa_addr->sa_family != AF_LINK) 234 continue; 235 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 236 if (sdl == NULL) 237 continue; 238 if (sdl->sdl_alen == 0) 239 continue; 240 241 goto found; 242 } 243 244 return -1; 245 246 found: 247 addr = LLADDR(sdl); 248 addrlen = sdl->sdl_alen; 249 250 /* get EUI64 */ 251 switch (ifp->if_type) { 252 case IFT_ETHER: 253 case IFT_FDDI: 254 case IFT_ISO88025: 255 case IFT_ATM: 256 case IFT_IEEE1394: 257 #ifdef IFT_IEEE80211 258 case IFT_IEEE80211: 259 #endif 260 /* IEEE802/EUI64 cases - what others? */ 261 /* IEEE1394 uses 16byte length address starting with EUI64 */ 262 if (addrlen > 8) 263 addrlen = 8; 264 265 /* look at IEEE802/EUI64 only */ 266 if (addrlen != 8 && addrlen != 6) 267 return -1; 268 269 /* 270 * check for invalid MAC address - on bsdi, we see it a lot 271 * since wildboar configures all-zero MAC on pccard before 272 * card insertion. 273 */ 274 if (bcmp(addr, allzero, addrlen) == 0) 275 return -1; 276 if (bcmp(addr, allone, addrlen) == 0) 277 return -1; 278 279 /* make EUI64 address */ 280 if (addrlen == 8) 281 bcopy(addr, &in6->s6_addr[8], 8); 282 else if (addrlen == 6) { 283 in6->s6_addr[8] = addr[0]; 284 in6->s6_addr[9] = addr[1]; 285 in6->s6_addr[10] = addr[2]; 286 in6->s6_addr[11] = 0xff; 287 in6->s6_addr[12] = 0xfe; 288 in6->s6_addr[13] = addr[3]; 289 in6->s6_addr[14] = addr[4]; 290 in6->s6_addr[15] = addr[5]; 291 } 292 break; 293 294 case IFT_ARCNET: 295 if (addrlen != 1) 296 return -1; 297 if (!addr[0]) 298 return -1; 299 300 bzero(&in6->s6_addr[8], 8); 301 in6->s6_addr[15] = addr[0]; 302 303 /* 304 * due to insufficient bitwidth, we mark it local. 305 */ 306 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 307 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 308 break; 309 310 case IFT_GIF: 311 #ifdef IFT_STF 312 case IFT_STF: 313 #endif 314 /* 315 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 316 * however, IPv4 address is not very suitable as unique 317 * identifier source (can be renumbered). 318 * we don't do this. 319 */ 320 return -1; 321 322 default: 323 return -1; 324 } 325 326 /* sanity check: g bit must not indicate "group" */ 327 if (EUI64_GROUP(in6)) 328 return -1; 329 330 /* convert EUI64 into IPv6 interface identifier */ 331 EUI64_TO_IFID(in6); 332 333 /* 334 * sanity check: ifid must not be all zero, avoid conflict with 335 * subnet router anycast 336 */ 337 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 338 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 339 return -1; 340 } 341 342 return 0; 343 } 344 345 /* 346 * Get interface identifier for the specified interface. If it is not 347 * available on ifp0, borrow interface identifier from other information 348 * sources. 349 */ 350 static int 351 get_ifid(ifp0, altifp, in6) 352 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 (in6_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 && in6_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 IFNET_RLOCK(); 374 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) { 375 if (ifp == ifp0) 376 continue; 377 if (in6_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 IFNET_RUNLOCK(); 389 goto success; 390 } 391 } 392 IFNET_RUNLOCK(); 393 394 /* last resort: get from random number source */ 395 if (get_rand_ifid(ifp, in6) == 0) { 396 nd6log((LOG_DEBUG, 397 "%s: interface identifier generated by random number\n", 398 if_name(ifp0))); 399 goto success; 400 } 401 402 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 403 return -1; 404 405 success: 406 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 407 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 408 in6->s6_addr[11], 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(ifp, altifp) 415 struct ifnet *ifp; 416 struct ifnet *altifp; /* secondary EUI64 source */ 417 { 418 struct in6_ifaddr *ia; 419 struct in6_aliasreq ifra; 420 struct nd_prefixctl 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_addr32[0] = htonl(0xfe800000); 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 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 449 return (-1); 450 451 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 452 ifra.ifra_prefixmask.sin6_family = AF_INET6; 453 ifra.ifra_prefixmask.sin6_addr = in6mask64; 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 * Now call in6_update_ifa() to do a bunch of procedures to configure 460 * a link-local address. We can set the 3rd argument to NULL, because 461 * we know there's no other link-local address on the interface 462 * and therefore we are adding one (instead of updating one). 463 */ 464 if ((error = in6_update_ifa(ifp, &ifra, NULL, 465 IN6_IFAUPDATE_DADDELAY)) != 0) { 466 /* 467 * XXX: When the interface does not support IPv6, this call 468 * would fail in the SIOCSIFADDR ioctl. I believe the 469 * notification is rather confusing in this case, so just 470 * suppress it. (jinmei@kame.net 20010130) 471 */ 472 if (error != EAFNOSUPPORT) 473 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 474 "configure a link-local address on %s " 475 "(errno=%d)\n", 476 if_name(ifp), error)); 477 return (-1); 478 } 479 480 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 481 #ifdef DIAGNOSTIC 482 if (!ia) { 483 panic("ia == NULL in in6_ifattach_linklocal"); 484 /* NOTREACHED */ 485 } 486 #endif 487 488 /* 489 * Make the link-local prefix (fe80::%link/64) as on-link. 490 * Since we'd like to manage prefixes separately from addresses, 491 * we make an ND6 prefix structure for the link-local prefix, 492 * and add it to the prefix list as a never-expire prefix. 493 * XXX: this change might affect some existing code base... 494 */ 495 bzero(&pr0, sizeof(pr0)); 496 pr0.ndpr_ifp = ifp; 497 /* this should be 64 at this moment. */ 498 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 499 pr0.ndpr_prefix = ifra.ifra_addr; 500 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 501 for (i = 0; i < 4; i++) { 502 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 503 in6mask64.s6_addr32[i]; 504 } 505 /* 506 * Initialize parameters. The link-local prefix must always be 507 * on-link, and its lifetimes never expire. 508 */ 509 pr0.ndpr_raf_onlink = 1; 510 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 511 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 512 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 513 /* 514 * Since there is no other link-local addresses, nd6_prefix_lookup() 515 * probably returns NULL. However, we cannot always expect the result. 516 * For example, if we first remove the (only) existing link-local 517 * address, and then reconfigure another one, the prefix is still 518 * valid with referring to the old link-local address. 519 */ 520 if (nd6_prefix_lookup(&pr0) == NULL) { 521 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 522 return (error); 523 } 524 525 return 0; 526 } 527 528 static int 529 in6_ifattach_loopback(ifp) 530 struct ifnet *ifp; /* must be IFT_LOOP */ 531 { 532 struct in6_aliasreq ifra; 533 int error; 534 535 bzero(&ifra, sizeof(ifra)); 536 537 /* 538 * in6_update_ifa() does not use ifra_name, but we accurately set it 539 * for safety. 540 */ 541 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 542 543 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 544 ifra.ifra_prefixmask.sin6_family = AF_INET6; 545 ifra.ifra_prefixmask.sin6_addr = in6mask128; 546 547 /* 548 * Always initialize ia_dstaddr (= broadcast address) to loopback 549 * address. Follows IPv4 practice - see in_ifinit(). 550 */ 551 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 552 ifra.ifra_dstaddr.sin6_family = AF_INET6; 553 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 554 555 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 556 ifra.ifra_addr.sin6_family = AF_INET6; 557 ifra.ifra_addr.sin6_addr = in6addr_loopback; 558 559 /* the loopback address should NEVER expire. */ 560 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 561 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 562 563 /* we don't need to perform DAD on loopback interfaces. */ 564 ifra.ifra_flags |= IN6_IFF_NODAD; 565 566 /* skip registration to the prefix list. XXX should be temporary. */ 567 ifra.ifra_flags |= IN6_IFF_NOPFX; 568 569 /* 570 * We are sure that this is a newly assigned address, so we can set 571 * NULL to the 3rd arg. 572 */ 573 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 574 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 575 "the loopback address on %s (errno=%d)\n", 576 if_name(ifp), error)); 577 return (-1); 578 } 579 580 return 0; 581 } 582 583 /* 584 * compute NI group address, based on the current hostname setting. 585 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 586 * 587 * when ifp == NULL, the caller is responsible for filling scopeid. 588 */ 589 int 590 in6_nigroup(ifp, name, namelen, in6) 591 struct ifnet *ifp; 592 const char *name; 593 int namelen; 594 struct in6_addr *in6; 595 { 596 const char *p; 597 u_char *q; 598 MD5_CTX ctxt; 599 u_int8_t digest[16]; 600 char l; 601 char n[64]; /* a single label must not exceed 63 chars */ 602 603 if (!namelen || !name) 604 return -1; 605 606 p = name; 607 while (p && *p && *p != '.' && p - name < namelen) 608 p++; 609 if (p - name > sizeof(n) - 1) 610 return -1; /* label too long */ 611 l = p - name; 612 strncpy(n, name, l); 613 n[(int)l] = '\0'; 614 for (q = n; *q; q++) { 615 if ('A' <= *q && *q <= 'Z') 616 *q = *q - 'A' + 'a'; 617 } 618 619 /* generate 8 bytes of pseudo-random value. */ 620 bzero(&ctxt, sizeof(ctxt)); 621 MD5Init(&ctxt); 622 MD5Update(&ctxt, &l, sizeof(l)); 623 MD5Update(&ctxt, n, l); 624 MD5Final(digest, &ctxt); 625 626 bzero(in6, sizeof(*in6)); 627 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 628 in6->s6_addr8[11] = 2; 629 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 630 if (in6_setscope(in6, ifp, NULL)) 631 return (-1); /* XXX: should not fail */ 632 633 return 0; 634 } 635 636 /* 637 * XXX multiple loopback interface needs more care. for instance, 638 * nodelocal address needs to be configured onto only one of them. 639 * XXX multiple link-local address case 640 */ 641 void 642 in6_ifattach(ifp, altifp) 643 struct ifnet *ifp; 644 struct ifnet *altifp; /* secondary EUI64 source */ 645 { 646 struct in6_ifaddr *ia; 647 struct in6_addr in6; 648 649 /* some of the interfaces are inherently not IPv6 capable */ 650 switch (ifp->if_type) { 651 case IFT_PFLOG: 652 case IFT_PFSYNC: 653 case IFT_CARP: 654 return; 655 } 656 657 /* 658 * quirks based on interface type 659 */ 660 switch (ifp->if_type) { 661 #ifdef IFT_STF 662 case IFT_STF: 663 /* 664 * 6to4 interface is a very special kind of beast. 665 * no multicast, no linklocal. RFC2529 specifies how to make 666 * linklocals for 6to4 interface, but there's no use and 667 * it is rather harmful to have one. 668 */ 669 goto statinit; 670 #endif 671 default: 672 break; 673 } 674 675 /* 676 * usually, we require multicast capability to the interface 677 */ 678 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 679 nd6log((LOG_INFO, "in6_ifattach: " 680 "%s is not multicast capable, IPv6 not enabled\n", 681 if_name(ifp))); 682 return; 683 } 684 685 /* 686 * assign loopback address for loopback interface. 687 * XXX multiple loopback interface case. 688 */ 689 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 690 in6 = in6addr_loopback; 691 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 692 if (in6_ifattach_loopback(ifp) != 0) 693 return; 694 } 695 } 696 697 /* 698 * assign a link-local address, if there's none. 699 */ 700 if (ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) { 701 ia = in6ifa_ifpforlinklocal(ifp, 0); 702 if (ia == NULL) { 703 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 704 /* linklocal address assigned */ 705 } else { 706 /* failed to assign linklocal address. bark? */ 707 } 708 } 709 } 710 711 #ifdef IFT_STF /* XXX */ 712 statinit: 713 #endif 714 715 /* update dynamically. */ 716 if (in6_maxmtu < ifp->if_mtu) 717 in6_maxmtu = ifp->if_mtu; 718 } 719 720 /* 721 * NOTE: in6_ifdetach() does not support loopback if at this moment. 722 * We don't need this function in bsdi, because interfaces are never removed 723 * from the ifnet list in bsdi. 724 */ 725 void 726 in6_ifdetach(ifp) 727 struct ifnet *ifp; 728 { 729 struct in6_ifaddr *ia, *oia; 730 struct ifaddr *ifa, *next; 731 struct rtentry *rt; 732 short rtflags; 733 struct sockaddr_in6 sin6; 734 struct in6_multi *in6m; 735 struct in6_multi *in6m_next; 736 737 /* remove neighbor management table */ 738 nd6_purge(ifp); 739 740 /* nuke any of IPv6 addresses we have */ 741 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) { 742 next = ifa->ifa_list.tqe_next; 743 if (ifa->ifa_addr->sa_family != AF_INET6) 744 continue; 745 in6_purgeaddr(ifa); 746 } 747 748 /* undo everything done by in6_ifattach(), just in case */ 749 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) { 750 next = ifa->ifa_list.tqe_next; 751 752 if (ifa->ifa_addr->sa_family != AF_INET6 753 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 754 continue; 755 } 756 757 ia = (struct in6_ifaddr *)ifa; 758 759 /* remove from the routing table */ 760 if ((ia->ia_flags & IFA_ROUTE) && 761 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 762 rtflags = rt->rt_flags; 763 rtfree(rt); 764 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 765 (struct sockaddr *)&ia->ia_addr, 766 (struct sockaddr *)&ia->ia_prefixmask, 767 rtflags, (struct rtentry **)0); 768 } 769 770 /* remove from the linked list */ 771 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 772 IFAFREE(&ia->ia_ifa); 773 774 /* also remove from the IPv6 address chain(itojun&jinmei) */ 775 oia = ia; 776 if (oia == (ia = in6_ifaddr)) 777 in6_ifaddr = ia->ia_next; 778 else { 779 while (ia->ia_next && (ia->ia_next != oia)) 780 ia = ia->ia_next; 781 if (ia->ia_next) 782 ia->ia_next = oia->ia_next; 783 else { 784 nd6log((LOG_ERR, 785 "%s: didn't unlink in6ifaddr from list\n", 786 if_name(ifp))); 787 } 788 } 789 790 IFAFREE(&oia->ia_ifa); 791 } 792 793 /* leave from all multicast groups joined */ 794 795 in6_pcbpurgeif0(&udbinfo, ifp); 796 in6_pcbpurgeif0(&ripcbinfo, ifp); 797 798 for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) { 799 in6m_next = LIST_NEXT(in6m, in6m_entry); 800 if (in6m->in6m_ifp != ifp) 801 continue; 802 in6_delmulti(in6m); 803 in6m = NULL; 804 } 805 806 /* 807 * remove neighbor management table. we call it twice just to make 808 * sure we nuke everything. maybe we need just one call. 809 * XXX: since the first call did not release addresses, some prefixes 810 * might remain. We should call nd6_purge() again to release the 811 * prefixes after removing all addresses above. 812 * (Or can we just delay calling nd6_purge until at this point?) 813 */ 814 nd6_purge(ifp); 815 816 /* remove route to link-local allnodes multicast (ff02::1) */ 817 bzero(&sin6, sizeof(sin6)); 818 sin6.sin6_len = sizeof(struct sockaddr_in6); 819 sin6.sin6_family = AF_INET6; 820 sin6.sin6_addr = in6addr_linklocal_allnodes; 821 if (in6_setscope(&sin6.sin6_addr, ifp, NULL)) 822 /* XXX: should not fail */ 823 return; 824 /* XXX grab lock first to avoid LOR */ 825 if (rt_tables[AF_INET6] != NULL) { 826 RADIX_NODE_HEAD_LOCK(rt_tables[AF_INET6]); 827 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 828 if (rt) { 829 if (rt->rt_ifp == ifp) 830 rtexpunge(rt); 831 RTFREE_LOCKED(rt); 832 } 833 RADIX_NODE_HEAD_UNLOCK(rt_tables[AF_INET6]); 834 } 835 } 836 837 int 838 in6_get_tmpifid(ifp, retbuf, baseid, generate) 839 struct ifnet *ifp; 840 u_int8_t *retbuf; 841 const u_int8_t *baseid; 842 int generate; 843 { 844 u_int8_t nullbuf[8]; 845 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 846 847 bzero(nullbuf, sizeof(nullbuf)); 848 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 849 /* we've never created a random ID. Create a new one. */ 850 generate = 1; 851 } 852 853 if (generate) { 854 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 855 856 /* generate_tmp_ifid will update seedn and buf */ 857 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 858 ndi->randomid); 859 } 860 bcopy(ndi->randomid, retbuf, 8); 861 862 return (0); 863 } 864 865 void 866 in6_tmpaddrtimer(ignored_arg) 867 void *ignored_arg; 868 { 869 struct nd_ifinfo *ndi; 870 u_int8_t nullbuf[8]; 871 struct ifnet *ifp; 872 int s = splnet(); 873 874 callout_reset(&in6_tmpaddrtimer_ch, 875 (ip6_temp_preferred_lifetime - ip6_desync_factor - 876 ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL); 877 878 bzero(nullbuf, sizeof(nullbuf)); 879 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 880 ndi = ND_IFINFO(ifp); 881 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 882 /* 883 * We've been generating a random ID on this interface. 884 * Create a new one. 885 */ 886 (void)generate_tmp_ifid(ndi->randomseed0, 887 ndi->randomseed1, ndi->randomid); 888 } 889 } 890 891 splx(s); 892 } 893