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 static void in6_purgemaddrs __P((struct ifnet *)); 80 81 #define EUI64_GBIT 0x01 82 #define EUI64_UBIT 0x02 83 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 84 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 85 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 86 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 87 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 88 89 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 90 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 91 92 /* 93 * Generate a last-resort interface identifier, when the machine has no 94 * IEEE802/EUI64 address sources. 95 * The goal here is to get an interface identifier that is 96 * (1) random enough and (2) does not change across reboot. 97 * We currently use MD5(hostname) for it. 98 */ 99 static int 100 get_rand_ifid(ifp, in6) 101 struct ifnet *ifp; 102 struct in6_addr *in6; /* upper 64bits are preserved */ 103 { 104 MD5_CTX ctxt; 105 u_int8_t digest[16]; 106 int hostnamelen = strlen(hostname); 107 108 #if 0 109 /* we need at least several letters as seed for ifid */ 110 if (hostnamelen < 3) 111 return -1; 112 #endif 113 114 /* generate 8 bytes of pseudo-random value. */ 115 bzero(&ctxt, sizeof(ctxt)); 116 MD5Init(&ctxt); 117 MD5Update(&ctxt, hostname, hostnamelen); 118 MD5Final(digest, &ctxt); 119 120 /* assumes sizeof(digest) > sizeof(ifid) */ 121 bcopy(digest, &in6->s6_addr[8], 8); 122 123 /* make sure to set "u" bit to local, and "g" bit to individual. */ 124 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 125 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 126 127 /* convert EUI64 into IPv6 interface identifier */ 128 EUI64_TO_IFID(in6); 129 130 return 0; 131 } 132 133 static int 134 generate_tmp_ifid(seed0, seed1, ret) 135 u_int8_t *seed0, *ret; 136 const u_int8_t *seed1; 137 { 138 MD5_CTX ctxt; 139 u_int8_t seed[16], digest[16], nullbuf[8]; 140 u_int32_t val32; 141 142 /* If there's no hisotry, start with a random seed. */ 143 bzero(nullbuf, sizeof(nullbuf)); 144 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 145 int i; 146 147 for (i = 0; i < 2; i++) { 148 val32 = arc4random(); 149 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 150 } 151 } else 152 bcopy(seed0, seed, 8); 153 154 /* copy the right-most 64-bits of the given address */ 155 /* XXX assumption on the size of IFID */ 156 bcopy(seed1, &seed[8], 8); 157 158 if (0) { /* for debugging purposes only */ 159 int i; 160 161 printf("generate_tmp_ifid: new randomized ID from: "); 162 for (i = 0; i < 16; i++) 163 printf("%02x", seed[i]); 164 printf(" "); 165 } 166 167 /* generate 16 bytes of pseudo-random value. */ 168 bzero(&ctxt, sizeof(ctxt)); 169 MD5Init(&ctxt); 170 MD5Update(&ctxt, seed, sizeof(seed)); 171 MD5Final(digest, &ctxt); 172 173 /* 174 * RFC 3041 3.2.1. (3) 175 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 176 * left-most bit is numbered 0) to zero. 177 */ 178 bcopy(digest, ret, 8); 179 ret[0] &= ~EUI64_UBIT; 180 181 /* 182 * XXX: we'd like to ensure that the generated value is not zero 183 * for simplicity. If the caclculated digest happens to be zero, 184 * use a random non-zero value as the last resort. 185 */ 186 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 187 nd6log((LOG_INFO, 188 "generate_tmp_ifid: computed MD5 value is zero.\n")); 189 190 val32 = arc4random(); 191 val32 = 1 + (val32 % (0xffffffff - 1)); 192 } 193 194 /* 195 * RFC 3041 3.2.1. (4) 196 * Take the rightmost 64-bits of the MD5 digest and save them in 197 * stable storage as the history value to be used in the next 198 * iteration of the algorithm. 199 */ 200 bcopy(&digest[8], seed0, 8); 201 202 if (0) { /* for debugging purposes only */ 203 int i; 204 205 printf("to: "); 206 for (i = 0; i < 16; i++) 207 printf("%02x", digest[i]); 208 printf("\n"); 209 } 210 211 return 0; 212 } 213 214 /* 215 * Get interface identifier for the specified interface. 216 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 217 */ 218 int 219 in6_get_hw_ifid(ifp, in6) 220 struct ifnet *ifp; 221 struct in6_addr *in6; /* upper 64bits are preserved */ 222 { 223 struct ifaddr *ifa; 224 struct sockaddr_dl *sdl; 225 u_int8_t *addr; 226 size_t addrlen; 227 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 228 static u_int8_t allone[8] = 229 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 230 231 for (ifa = ifp->if_addrlist.tqh_first; 232 ifa; 233 ifa = ifa->ifa_list.tqe_next) { 234 if (ifa->ifa_addr->sa_family != AF_LINK) 235 continue; 236 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 237 if (sdl == NULL) 238 continue; 239 if (sdl->sdl_alen == 0) 240 continue; 241 242 goto found; 243 } 244 245 return -1; 246 247 found: 248 addr = LLADDR(sdl); 249 addrlen = sdl->sdl_alen; 250 251 /* get EUI64 */ 252 switch (ifp->if_type) { 253 case IFT_ETHER: 254 case IFT_FDDI: 255 case IFT_ISO88025: 256 case IFT_ATM: 257 case IFT_IEEE1394: 258 #ifdef IFT_IEEE80211 259 case IFT_IEEE80211: 260 #endif 261 /* IEEE802/EUI64 cases - what others? */ 262 /* IEEE1394 uses 16byte length address starting with EUI64 */ 263 if (addrlen > 8) 264 addrlen = 8; 265 266 /* look at IEEE802/EUI64 only */ 267 if (addrlen != 8 && addrlen != 6) 268 return -1; 269 270 /* 271 * check for invalid MAC address - on bsdi, we see it a lot 272 * since wildboar configures all-zero MAC on pccard before 273 * card insertion. 274 */ 275 if (bcmp(addr, allzero, addrlen) == 0) 276 return -1; 277 if (bcmp(addr, allone, addrlen) == 0) 278 return -1; 279 280 /* make EUI64 address */ 281 if (addrlen == 8) 282 bcopy(addr, &in6->s6_addr[8], 8); 283 else if (addrlen == 6) { 284 in6->s6_addr[8] = addr[0]; 285 in6->s6_addr[9] = addr[1]; 286 in6->s6_addr[10] = addr[2]; 287 in6->s6_addr[11] = 0xff; 288 in6->s6_addr[12] = 0xfe; 289 in6->s6_addr[13] = addr[3]; 290 in6->s6_addr[14] = addr[4]; 291 in6->s6_addr[15] = addr[5]; 292 } 293 break; 294 295 case IFT_ARCNET: 296 if (addrlen != 1) 297 return -1; 298 if (!addr[0]) 299 return -1; 300 301 bzero(&in6->s6_addr[8], 8); 302 in6->s6_addr[15] = addr[0]; 303 304 /* 305 * due to insufficient bitwidth, we mark it local. 306 */ 307 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 308 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 309 break; 310 311 case IFT_GIF: 312 #ifdef IFT_STF 313 case IFT_STF: 314 #endif 315 /* 316 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 317 * however, IPv4 address is not very suitable as unique 318 * identifier source (can be renumbered). 319 * we don't do this. 320 */ 321 return -1; 322 323 default: 324 return -1; 325 } 326 327 /* sanity check: g bit must not indicate "group" */ 328 if (EUI64_GROUP(in6)) 329 return -1; 330 331 /* convert EUI64 into IPv6 interface identifier */ 332 EUI64_TO_IFID(in6); 333 334 /* 335 * sanity check: ifid must not be all zero, avoid conflict with 336 * subnet router anycast 337 */ 338 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 339 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 340 return -1; 341 } 342 343 return 0; 344 } 345 346 /* 347 * Get interface identifier for the specified interface. If it is not 348 * available on ifp0, borrow interface identifier from other information 349 * sources. 350 */ 351 static int 352 get_ifid(ifp0, altifp, in6) 353 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 (in6_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 && in6_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 IFNET_RLOCK(); 375 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) { 376 if (ifp == ifp0) 377 continue; 378 if (in6_get_hw_ifid(ifp, in6) != 0) 379 continue; 380 381 /* 382 * to borrow ifid from other interface, ifid needs to be 383 * globally unique 384 */ 385 if (IFID_UNIVERSAL(in6)) { 386 nd6log((LOG_DEBUG, 387 "%s: borrow interface identifier from %s\n", 388 if_name(ifp0), if_name(ifp))); 389 IFNET_RUNLOCK(); 390 goto success; 391 } 392 } 393 IFNET_RUNLOCK(); 394 395 /* last resort: get from random number source */ 396 if (get_rand_ifid(ifp, in6) == 0) { 397 nd6log((LOG_DEBUG, 398 "%s: interface identifier generated by random number\n", 399 if_name(ifp0))); 400 goto success; 401 } 402 403 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 404 return -1; 405 406 success: 407 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 408 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 409 in6->s6_addr[11], 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(ifp, altifp) 416 struct ifnet *ifp; 417 struct ifnet *altifp; /* secondary EUI64 source */ 418 { 419 struct in6_ifaddr *ia; 420 struct in6_aliasreq ifra; 421 struct nd_prefixctl pr0; 422 int i, error; 423 424 /* 425 * configure link-local address. 426 */ 427 bzero(&ifra, sizeof(ifra)); 428 429 /* 430 * in6_update_ifa() does not use ifra_name, but we accurately set it 431 * for safety. 432 */ 433 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 434 435 ifra.ifra_addr.sin6_family = AF_INET6; 436 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 437 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 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 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 450 return (-1); 451 452 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 453 ifra.ifra_prefixmask.sin6_family = AF_INET6; 454 ifra.ifra_prefixmask.sin6_addr = in6mask64; 455 /* link-local addresses should NEVER expire. */ 456 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 457 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 458 459 /* 460 * Now call in6_update_ifa() to do a bunch of procedures to configure 461 * a link-local address. We can set the 3rd argument to NULL, because 462 * we know there's no other link-local address on the interface 463 * and therefore we are adding one (instead of updating one). 464 */ 465 if ((error = in6_update_ifa(ifp, &ifra, NULL, 466 IN6_IFAUPDATE_DADDELAY)) != 0) { 467 /* 468 * XXX: When the interface does not support IPv6, this call 469 * would fail in the SIOCSIFADDR ioctl. I believe the 470 * notification is rather confusing in this case, so just 471 * suppress it. (jinmei@kame.net 20010130) 472 */ 473 if (error != EAFNOSUPPORT) 474 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 475 "configure a link-local address on %s " 476 "(errno=%d)\n", 477 if_name(ifp), error)); 478 return (-1); 479 } 480 481 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 482 #ifdef DIAGNOSTIC 483 if (!ia) { 484 panic("ia == NULL in in6_ifattach_linklocal"); 485 /* NOTREACHED */ 486 } 487 #endif 488 489 /* 490 * Make the link-local prefix (fe80::%link/64) as on-link. 491 * Since we'd like to manage prefixes separately from addresses, 492 * we make an ND6 prefix structure for the link-local prefix, 493 * and add it to the prefix list as a never-expire prefix. 494 * XXX: this change might affect some existing code base... 495 */ 496 bzero(&pr0, sizeof(pr0)); 497 pr0.ndpr_ifp = ifp; 498 /* this should be 64 at this moment. */ 499 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 500 pr0.ndpr_prefix = ifra.ifra_addr; 501 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 502 for (i = 0; i < 4; i++) { 503 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 504 in6mask64.s6_addr32[i]; 505 } 506 /* 507 * Initialize parameters. The link-local prefix must always be 508 * on-link, and its lifetimes never expire. 509 */ 510 pr0.ndpr_raf_onlink = 1; 511 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 512 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 513 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 514 /* 515 * Since there is no other link-local addresses, nd6_prefix_lookup() 516 * probably returns NULL. However, we cannot always expect the result. 517 * For example, if we first remove the (only) existing link-local 518 * address, and then reconfigure another one, the prefix is still 519 * valid with referring to the old link-local address. 520 */ 521 if (nd6_prefix_lookup(&pr0) == NULL) { 522 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 523 return (error); 524 } 525 526 return 0; 527 } 528 529 static int 530 in6_ifattach_loopback(ifp) 531 struct ifnet *ifp; /* must be IFT_LOOP */ 532 { 533 struct in6_aliasreq ifra; 534 int error; 535 536 bzero(&ifra, sizeof(ifra)); 537 538 /* 539 * in6_update_ifa() does not use ifra_name, but we accurately set it 540 * for safety. 541 */ 542 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 543 544 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 545 ifra.ifra_prefixmask.sin6_family = AF_INET6; 546 ifra.ifra_prefixmask.sin6_addr = in6mask128; 547 548 /* 549 * Always initialize ia_dstaddr (= broadcast address) to loopback 550 * address. Follows IPv4 practice - see in_ifinit(). 551 */ 552 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 553 ifra.ifra_dstaddr.sin6_family = AF_INET6; 554 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 555 556 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 557 ifra.ifra_addr.sin6_family = AF_INET6; 558 ifra.ifra_addr.sin6_addr = in6addr_loopback; 559 560 /* the loopback address should NEVER expire. */ 561 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 562 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 563 564 /* we don't need to perform DAD on loopback interfaces. */ 565 ifra.ifra_flags |= IN6_IFF_NODAD; 566 567 /* skip registration to the prefix list. XXX should be temporary. */ 568 ifra.ifra_flags |= IN6_IFF_NOPFX; 569 570 /* 571 * We are sure that this is a newly assigned address, so we can set 572 * NULL to the 3rd arg. 573 */ 574 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 575 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 576 "the loopback address on %s (errno=%d)\n", 577 if_name(ifp), error)); 578 return (-1); 579 } 580 581 return 0; 582 } 583 584 /* 585 * compute NI group address, based on the current hostname setting. 586 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 587 * 588 * when ifp == NULL, the caller is responsible for filling scopeid. 589 */ 590 int 591 in6_nigroup(ifp, name, namelen, in6) 592 struct ifnet *ifp; 593 const char *name; 594 int namelen; 595 struct in6_addr *in6; 596 { 597 const char *p; 598 u_char *q; 599 MD5_CTX ctxt; 600 u_int8_t digest[16]; 601 char l; 602 char n[64]; /* a single label must not exceed 63 chars */ 603 604 if (!namelen || !name) 605 return -1; 606 607 p = name; 608 while (p && *p && *p != '.' && p - name < namelen) 609 p++; 610 if (p - name > sizeof(n) - 1) 611 return -1; /* label too long */ 612 l = p - name; 613 strncpy(n, name, l); 614 n[(int)l] = '\0'; 615 for (q = n; *q; q++) { 616 if ('A' <= *q && *q <= 'Z') 617 *q = *q - 'A' + 'a'; 618 } 619 620 /* generate 8 bytes of pseudo-random value. */ 621 bzero(&ctxt, sizeof(ctxt)); 622 MD5Init(&ctxt); 623 MD5Update(&ctxt, &l, sizeof(l)); 624 MD5Update(&ctxt, n, l); 625 MD5Final(digest, &ctxt); 626 627 bzero(in6, sizeof(*in6)); 628 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 629 in6->s6_addr8[11] = 2; 630 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 631 if (in6_setscope(in6, ifp, NULL)) 632 return (-1); /* XXX: should not fail */ 633 634 return 0; 635 } 636 637 /* 638 * XXX multiple loopback interface needs more care. for instance, 639 * nodelocal address needs to be configured onto only one of them. 640 * XXX multiple link-local address case 641 */ 642 void 643 in6_ifattach(ifp, altifp) 644 struct ifnet *ifp; 645 struct ifnet *altifp; /* secondary EUI64 source */ 646 { 647 struct in6_ifaddr *ia; 648 struct in6_addr in6; 649 650 /* some of the interfaces are inherently not IPv6 capable */ 651 switch (ifp->if_type) { 652 case IFT_PFLOG: 653 case IFT_PFSYNC: 654 case IFT_CARP: 655 return; 656 } 657 658 /* 659 * quirks based on interface type 660 */ 661 switch (ifp->if_type) { 662 #ifdef IFT_STF 663 case IFT_STF: 664 /* 665 * 6to4 interface is a very special kind of beast. 666 * no multicast, no linklocal. RFC2529 specifies how to make 667 * linklocals for 6to4 interface, but there's no use and 668 * it is rather harmful to have one. 669 */ 670 goto statinit; 671 #endif 672 default: 673 break; 674 } 675 676 /* 677 * usually, we require multicast capability to the interface 678 */ 679 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 680 nd6log((LOG_INFO, "in6_ifattach: " 681 "%s is not multicast capable, IPv6 not enabled\n", 682 if_name(ifp))); 683 return; 684 } 685 686 /* 687 * assign loopback address for loopback interface. 688 * XXX multiple loopback interface case. 689 */ 690 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 691 in6 = in6addr_loopback; 692 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 693 if (in6_ifattach_loopback(ifp) != 0) 694 return; 695 } 696 } 697 698 /* 699 * assign a link-local address, if there's none. 700 */ 701 if (ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) { 702 ia = in6ifa_ifpforlinklocal(ifp, 0); 703 if (ia == NULL) { 704 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 705 /* linklocal address assigned */ 706 } else { 707 /* failed to assign linklocal address. bark? */ 708 } 709 } 710 } 711 712 #ifdef IFT_STF /* XXX */ 713 statinit: 714 #endif 715 716 /* update dynamically. */ 717 if (in6_maxmtu < ifp->if_mtu) 718 in6_maxmtu = ifp->if_mtu; 719 } 720 721 /* 722 * NOTE: in6_ifdetach() does not support loopback if at this moment. 723 * We don't need this function in bsdi, because interfaces are never removed 724 * from the ifnet list in bsdi. 725 */ 726 void 727 in6_ifdetach(ifp) 728 struct ifnet *ifp; 729 { 730 struct in6_ifaddr *ia, *oia; 731 struct ifaddr *ifa, *next; 732 struct rtentry *rt; 733 short rtflags; 734 struct sockaddr_in6 sin6; 735 struct in6_multi_mship *imm; 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 /* 760 * leave from multicast groups we have joined for the interface 761 */ 762 while ((imm = ia->ia6_memberships.lh_first) != NULL) { 763 LIST_REMOVE(imm, i6mm_chain); 764 in6_leavegroup(imm); 765 } 766 767 /* remove from the routing table */ 768 if ((ia->ia_flags & IFA_ROUTE) && 769 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 770 rtflags = rt->rt_flags; 771 rtfree(rt); 772 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 773 (struct sockaddr *)&ia->ia_addr, 774 (struct sockaddr *)&ia->ia_prefixmask, 775 rtflags, (struct rtentry **)0); 776 } 777 778 /* remove from the linked list */ 779 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 780 IFAFREE(&ia->ia_ifa); 781 782 /* also remove from the IPv6 address chain(itojun&jinmei) */ 783 oia = ia; 784 if (oia == (ia = in6_ifaddr)) 785 in6_ifaddr = ia->ia_next; 786 else { 787 while (ia->ia_next && (ia->ia_next != oia)) 788 ia = ia->ia_next; 789 if (ia->ia_next) 790 ia->ia_next = oia->ia_next; 791 else { 792 nd6log((LOG_ERR, 793 "%s: didn't unlink in6ifaddr from list\n", 794 if_name(ifp))); 795 } 796 } 797 798 IFAFREE(&oia->ia_ifa); 799 } 800 801 in6_pcbpurgeif0(&udbinfo, ifp); 802 in6_pcbpurgeif0(&ripcbinfo, ifp); 803 /* leave from all multicast groups joined */ 804 in6_purgemaddrs(ifp); 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 } 893 894 static void 895 in6_purgemaddrs(ifp) 896 struct ifnet *ifp; 897 { 898 struct in6_multi *in6m; 899 struct in6_multi *oin6m; 900 901 #ifdef DIAGNOSTIC 902 printf("%s: purging ifp %p\n", __func__, ifp); 903 #endif 904 905 IFF_LOCKGIANT(ifp); 906 LIST_FOREACH_SAFE(in6m, &in6_multihead, in6m_entry, oin6m) { 907 if (in6m->in6m_ifp == ifp) 908 in6_delmulti(in6m); 909 } 910 IFF_UNLOCKGIANT(ifp); 911 } 912