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sys/netinet6/in6_ifattach.c
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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 * in6 - upper 64bits are preserved 100 */ 101 static int 102 get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 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(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 135 { 136 MD5_CTX ctxt; 137 u_int8_t seed[16], digest[16], nullbuf[8]; 138 u_int32_t val32; 139 140 /* If there's no history, start with a random seed. */ 141 bzero(nullbuf, sizeof(nullbuf)); 142 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 143 int i; 144 145 for (i = 0; i < 2; i++) { 146 val32 = arc4random(); 147 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 148 } 149 } else 150 bcopy(seed0, seed, 8); 151 152 /* copy the right-most 64-bits of the given address */ 153 /* XXX assumption on the size of IFID */ 154 bcopy(seed1, &seed[8], 8); 155 156 if (0) { /* for debugging purposes only */ 157 int i; 158 159 printf("generate_tmp_ifid: new randomized ID from: "); 160 for (i = 0; i < 16; i++) 161 printf("%02x", seed[i]); 162 printf(" "); 163 } 164 165 /* generate 16 bytes of pseudo-random value. */ 166 bzero(&ctxt, sizeof(ctxt)); 167 MD5Init(&ctxt); 168 MD5Update(&ctxt, seed, sizeof(seed)); 169 MD5Final(digest, &ctxt); 170 171 /* 172 * RFC 3041 3.2.1. (3) 173 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 174 * left-most bit is numbered 0) to zero. 175 */ 176 bcopy(digest, ret, 8); 177 ret[0] &= ~EUI64_UBIT; 178 179 /* 180 * XXX: we'd like to ensure that the generated value is not zero 181 * for simplicity. If the caclculated digest happens to be zero, 182 * use a random non-zero value as the last resort. 183 */ 184 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 185 nd6log((LOG_INFO, 186 "generate_tmp_ifid: computed MD5 value is zero.\n")); 187 188 val32 = arc4random(); 189 val32 = 1 + (val32 % (0xffffffff - 1)); 190 } 191 192 /* 193 * RFC 3041 3.2.1. (4) 194 * Take the rightmost 64-bits of the MD5 digest and save them in 195 * stable storage as the history value to be used in the next 196 * iteration of the algorithm. 197 */ 198 bcopy(&digest[8], seed0, 8); 199 200 if (0) { /* for debugging purposes only */ 201 int i; 202 203 printf("to: "); 204 for (i = 0; i < 16; i++) 205 printf("%02x", digest[i]); 206 printf("\n"); 207 } 208 209 return 0; 210 } 211 212 /* 213 * Get interface identifier for the specified interface. 214 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 215 * 216 * in6 - upper 64bits are preserved 217 */ 218 int 219 in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 220 { 221 struct ifaddr *ifa; 222 struct sockaddr_dl *sdl; 223 u_int8_t *addr; 224 size_t addrlen; 225 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 226 static u_int8_t allone[8] = 227 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 228 229 for (ifa = ifp->if_addrlist.tqh_first; 230 ifa; 231 ifa = ifa->ifa_list.tqe_next) { 232 if (ifa->ifa_addr->sa_family != AF_LINK) 233 continue; 234 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 235 if (sdl == NULL) 236 continue; 237 if (sdl->sdl_alen == 0) 238 continue; 239 240 goto found; 241 } 242 243 return -1; 244 245 found: 246 addr = LLADDR(sdl); 247 addrlen = sdl->sdl_alen; 248 249 /* get EUI64 */ 250 switch (ifp->if_type) { 251 case IFT_ETHER: 252 case IFT_FDDI: 253 case IFT_ISO88025: 254 case IFT_ATM: 255 case IFT_IEEE1394: 256 #ifdef IFT_IEEE80211 257 case IFT_IEEE80211: 258 #endif 259 /* IEEE802/EUI64 cases - what others? */ 260 /* IEEE1394 uses 16byte length address starting with EUI64 */ 261 if (addrlen > 8) 262 addrlen = 8; 263 264 /* look at IEEE802/EUI64 only */ 265 if (addrlen != 8 && addrlen != 6) 266 return -1; 267 268 /* 269 * check for invalid MAC address - on bsdi, we see it a lot 270 * since wildboar configures all-zero MAC on pccard before 271 * card insertion. 272 */ 273 if (bcmp(addr, allzero, addrlen) == 0) 274 return -1; 275 if (bcmp(addr, allone, addrlen) == 0) 276 return -1; 277 278 /* make EUI64 address */ 279 if (addrlen == 8) 280 bcopy(addr, &in6->s6_addr[8], 8); 281 else if (addrlen == 6) { 282 in6->s6_addr[8] = addr[0]; 283 in6->s6_addr[9] = addr[1]; 284 in6->s6_addr[10] = addr[2]; 285 in6->s6_addr[11] = 0xff; 286 in6->s6_addr[12] = 0xfe; 287 in6->s6_addr[13] = addr[3]; 288 in6->s6_addr[14] = addr[4]; 289 in6->s6_addr[15] = addr[5]; 290 } 291 break; 292 293 case IFT_ARCNET: 294 if (addrlen != 1) 295 return -1; 296 if (!addr[0]) 297 return -1; 298 299 bzero(&in6->s6_addr[8], 8); 300 in6->s6_addr[15] = addr[0]; 301 302 /* 303 * due to insufficient bitwidth, we mark it local. 304 */ 305 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 306 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 307 break; 308 309 case IFT_GIF: 310 #ifdef IFT_STF 311 case IFT_STF: 312 #endif 313 /* 314 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 315 * however, IPv4 address is not very suitable as unique 316 * identifier source (can be renumbered). 317 * we don't do this. 318 */ 319 return -1; 320 321 default: 322 return -1; 323 } 324 325 /* sanity check: g bit must not indicate "group" */ 326 if (EUI64_GROUP(in6)) 327 return -1; 328 329 /* convert EUI64 into IPv6 interface identifier */ 330 EUI64_TO_IFID(in6); 331 332 /* 333 * sanity check: ifid must not be all zero, avoid conflict with 334 * subnet router anycast 335 */ 336 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 337 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 338 return -1; 339 } 340 341 return 0; 342 } 343 344 /* 345 * Get interface identifier for the specified interface. If it is not 346 * available on ifp0, borrow interface identifier from other information 347 * sources. 348 * 349 * altifp - secondary EUI64 source 350 */ 351 static int 352 get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 353 struct in6_addr *in6) 354 { 355 struct ifnet *ifp; 356 357 /* first, try to get it from the interface itself */ 358 if (in6_get_hw_ifid(ifp0, in6) == 0) { 359 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 360 if_name(ifp0))); 361 goto success; 362 } 363 364 /* try secondary EUI64 source. this basically is for ATM PVC */ 365 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 366 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 367 if_name(ifp0), if_name(altifp))); 368 goto success; 369 } 370 371 /* next, try to get it from some other hardware interface */ 372 IFNET_RLOCK(); 373 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) { 374 if (ifp == ifp0) 375 continue; 376 if (in6_get_hw_ifid(ifp, in6) != 0) 377 continue; 378 379 /* 380 * to borrow ifid from other interface, ifid needs to be 381 * globally unique 382 */ 383 if (IFID_UNIVERSAL(in6)) { 384 nd6log((LOG_DEBUG, 385 "%s: borrow interface identifier from %s\n", 386 if_name(ifp0), if_name(ifp))); 387 IFNET_RUNLOCK(); 388 goto success; 389 } 390 } 391 IFNET_RUNLOCK(); 392 393 /* last resort: get from random number source */ 394 if (get_rand_ifid(ifp, in6) == 0) { 395 nd6log((LOG_DEBUG, 396 "%s: interface identifier generated by random number\n", 397 if_name(ifp0))); 398 goto success; 399 } 400 401 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 402 return -1; 403 404 success: 405 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 406 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 407 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 408 in6->s6_addr[14], in6->s6_addr[15])); 409 return 0; 410 } 411 412 /* 413 * altifp - secondary EUI64 source 414 */ 415 static int 416 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 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 /* 529 * ifp - must be IFT_LOOP 530 */ 531 static int 532 in6_ifattach_loopback(struct ifnet *ifp) 533 { 534 struct in6_aliasreq ifra; 535 int error; 536 537 bzero(&ifra, sizeof(ifra)); 538 539 /* 540 * in6_update_ifa() does not use ifra_name, but we accurately set it 541 * for safety. 542 */ 543 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 544 545 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 546 ifra.ifra_prefixmask.sin6_family = AF_INET6; 547 ifra.ifra_prefixmask.sin6_addr = in6mask128; 548 549 /* 550 * Always initialize ia_dstaddr (= broadcast address) to loopback 551 * address. Follows IPv4 practice - see in_ifinit(). 552 */ 553 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 554 ifra.ifra_dstaddr.sin6_family = AF_INET6; 555 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 556 557 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 558 ifra.ifra_addr.sin6_family = AF_INET6; 559 ifra.ifra_addr.sin6_addr = in6addr_loopback; 560 561 /* the loopback address should NEVER expire. */ 562 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 563 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 564 565 /* we don't need to perform DAD on loopback interfaces. */ 566 ifra.ifra_flags |= IN6_IFF_NODAD; 567 568 /* skip registration to the prefix list. XXX should be temporary. */ 569 ifra.ifra_flags |= IN6_IFF_NOPFX; 570 571 /* 572 * We are sure that this is a newly assigned address, so we can set 573 * NULL to the 3rd arg. 574 */ 575 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 576 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 577 "the loopback address on %s (errno=%d)\n", 578 if_name(ifp), error)); 579 return (-1); 580 } 581 582 return 0; 583 } 584 585 /* 586 * compute NI group address, based on the current hostname setting. 587 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 588 * 589 * when ifp == NULL, the caller is responsible for filling scopeid. 590 */ 591 int 592 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 593 struct in6_addr *in6) 594 { 595 const char *p; 596 u_char *q; 597 MD5_CTX ctxt; 598 u_int8_t digest[16]; 599 char l; 600 char n[64]; /* a single label must not exceed 63 chars */ 601 602 if (!namelen || !name) 603 return -1; 604 605 p = name; 606 while (p && *p && *p != '.' && p - name < namelen) 607 p++; 608 if (p - name > sizeof(n) - 1) 609 return -1; /* label too long */ 610 l = p - name; 611 strncpy(n, name, l); 612 n[(int)l] = '\0'; 613 for (q = n; *q; q++) { 614 if ('A' <= *q && *q <= 'Z') 615 *q = *q - 'A' + 'a'; 616 } 617 618 /* generate 8 bytes of pseudo-random value. */ 619 bzero(&ctxt, sizeof(ctxt)); 620 MD5Init(&ctxt); 621 MD5Update(&ctxt, &l, sizeof(l)); 622 MD5Update(&ctxt, n, l); 623 MD5Final(digest, &ctxt); 624 625 bzero(in6, sizeof(*in6)); 626 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 627 in6->s6_addr8[11] = 2; 628 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 629 if (in6_setscope(in6, ifp, NULL)) 630 return (-1); /* XXX: should not fail */ 631 632 return 0; 633 } 634 635 /* 636 * XXX multiple loopback interface needs more care. for instance, 637 * nodelocal address needs to be configured onto only one of them. 638 * XXX multiple link-local address case 639 * 640 * altifp - secondary EUI64 source 641 */ 642 void 643 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 644 { 645 struct in6_ifaddr *ia; 646 struct in6_addr in6; 647 648 /* some of the interfaces are inherently not IPv6 capable */ 649 switch (ifp->if_type) { 650 case IFT_PFLOG: 651 case IFT_PFSYNC: 652 case IFT_CARP: 653 return; 654 } 655 656 /* 657 * quirks based on interface type 658 */ 659 switch (ifp->if_type) { 660 #ifdef IFT_STF 661 case IFT_STF: 662 /* 663 * 6to4 interface is a very special kind of beast. 664 * no multicast, no linklocal. RFC2529 specifies how to make 665 * linklocals for 6to4 interface, but there's no use and 666 * it is rather harmful to have one. 667 */ 668 goto statinit; 669 #endif 670 default: 671 break; 672 } 673 674 /* 675 * usually, we require multicast capability to the interface 676 */ 677 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 678 nd6log((LOG_INFO, "in6_ifattach: " 679 "%s is not multicast capable, IPv6 not enabled\n", 680 if_name(ifp))); 681 return; 682 } 683 684 /* 685 * assign loopback address for loopback interface. 686 * XXX multiple loopback interface case. 687 */ 688 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 689 in6 = in6addr_loopback; 690 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 691 if (in6_ifattach_loopback(ifp) != 0) 692 return; 693 } 694 } 695 696 /* 697 * assign a link-local address, if there's none. 698 */ 699 if (ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) { 700 ia = in6ifa_ifpforlinklocal(ifp, 0); 701 if (ia == NULL) { 702 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 703 /* linklocal address assigned */ 704 } else { 705 /* failed to assign linklocal address. bark? */ 706 } 707 } 708 } 709 710 #ifdef IFT_STF /* XXX */ 711 statinit: 712 #endif 713 714 /* update dynamically. */ 715 if (in6_maxmtu < ifp->if_mtu) 716 in6_maxmtu = ifp->if_mtu; 717 } 718 719 /* 720 * NOTE: in6_ifdetach() does not support loopback if at this moment. 721 * We don't need this function in bsdi, because interfaces are never removed 722 * from the ifnet list in bsdi. 723 */ 724 void 725 in6_ifdetach(struct ifnet *ifp) 726 { 727 struct in6_ifaddr *ia, *oia; 728 struct ifaddr *ifa, *next; 729 struct rtentry *rt; 730 short rtflags; 731 struct sockaddr_in6 sin6; 732 struct in6_multi_mship *imm; 733 734 /* remove neighbor management table */ 735 nd6_purge(ifp); 736 737 /* nuke any of IPv6 addresses we have */ 738 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) { 739 next = ifa->ifa_list.tqe_next; 740 if (ifa->ifa_addr->sa_family != AF_INET6) 741 continue; 742 in6_purgeaddr(ifa); 743 } 744 745 /* undo everything done by in6_ifattach(), just in case */ 746 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) { 747 next = ifa->ifa_list.tqe_next; 748 749 if (ifa->ifa_addr->sa_family != AF_INET6 750 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 751 continue; 752 } 753 754 ia = (struct in6_ifaddr *)ifa; 755 756 /* 757 * leave from multicast groups we have joined for the interface 758 */ 759 while ((imm = ia->ia6_memberships.lh_first) != NULL) { 760 LIST_REMOVE(imm, i6mm_chain); 761 in6_leavegroup(imm); 762 } 763 764 /* remove from the routing table */ 765 if ((ia->ia_flags & IFA_ROUTE) && 766 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 767 rtflags = rt->rt_flags; 768 rtfree(rt); 769 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 770 (struct sockaddr *)&ia->ia_addr, 771 (struct sockaddr *)&ia->ia_prefixmask, 772 rtflags, (struct rtentry **)0); 773 } 774 775 /* remove from the linked list */ 776 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 777 IFAFREE(&ia->ia_ifa); 778 779 /* also remove from the IPv6 address chain(itojun&jinmei) */ 780 oia = ia; 781 if (oia == (ia = in6_ifaddr)) 782 in6_ifaddr = ia->ia_next; 783 else { 784 while (ia->ia_next && (ia->ia_next != oia)) 785 ia = ia->ia_next; 786 if (ia->ia_next) 787 ia->ia_next = oia->ia_next; 788 else { 789 nd6log((LOG_ERR, 790 "%s: didn't unlink in6ifaddr from list\n", 791 if_name(ifp))); 792 } 793 } 794 795 IFAFREE(&oia->ia_ifa); 796 } 797 798 in6_pcbpurgeif0(&udbinfo, ifp); 799 in6_pcbpurgeif0(&ripcbinfo, ifp); 800 /* leave from all multicast groups joined */ 801 in6_purgemaddrs(ifp); 802 803 /* 804 * remove neighbor management table. we call it twice just to make 805 * sure we nuke everything. maybe we need just one call. 806 * XXX: since the first call did not release addresses, some prefixes 807 * might remain. We should call nd6_purge() again to release the 808 * prefixes after removing all addresses above. 809 * (Or can we just delay calling nd6_purge until at this point?) 810 */ 811 nd6_purge(ifp); 812 813 /* remove route to link-local allnodes multicast (ff02::1) */ 814 bzero(&sin6, sizeof(sin6)); 815 sin6.sin6_len = sizeof(struct sockaddr_in6); 816 sin6.sin6_family = AF_INET6; 817 sin6.sin6_addr = in6addr_linklocal_allnodes; 818 if (in6_setscope(&sin6.sin6_addr, ifp, NULL)) 819 /* XXX: should not fail */ 820 return; 821 /* XXX grab lock first to avoid LOR */ 822 if (rt_tables[AF_INET6] != NULL) { 823 RADIX_NODE_HEAD_LOCK(rt_tables[AF_INET6]); 824 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 825 if (rt) { 826 if (rt->rt_ifp == ifp) 827 rtexpunge(rt); 828 RTFREE_LOCKED(rt); 829 } 830 RADIX_NODE_HEAD_UNLOCK(rt_tables[AF_INET6]); 831 } 832 } 833 834 int 835 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 836 const u_int8_t *baseid, int generate) 837 { 838 u_int8_t nullbuf[8]; 839 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 840 841 bzero(nullbuf, sizeof(nullbuf)); 842 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 843 /* we've never created a random ID. Create a new one. */ 844 generate = 1; 845 } 846 847 if (generate) { 848 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 849 850 /* generate_tmp_ifid will update seedn and buf */ 851 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 852 ndi->randomid); 853 } 854 bcopy(ndi->randomid, retbuf, 8); 855 856 return (0); 857 } 858 859 void 860 in6_tmpaddrtimer(void *ignored_arg) 861 { 862 struct nd_ifinfo *ndi; 863 u_int8_t nullbuf[8]; 864 struct ifnet *ifp; 865 int s = splnet(); 866 867 callout_reset(&in6_tmpaddrtimer_ch, 868 (ip6_temp_preferred_lifetime - ip6_desync_factor - 869 ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL); 870 871 bzero(nullbuf, sizeof(nullbuf)); 872 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 873 ndi = ND_IFINFO(ifp); 874 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 875 /* 876 * We've been generating a random ID on this interface. 877 * Create a new one. 878 */ 879 (void)generate_tmp_ifid(ndi->randomseed0, 880 ndi->randomseed1, ndi->randomid); 881 } 882 } 883 884 splx(s); 885 } 886 887 static void 888 in6_purgemaddrs(struct ifnet *ifp) 889 { 890 struct in6_multi *in6m; 891 struct in6_multi *oin6m; 892 893 #ifdef DIAGNOSTIC 894 printf("%s: purging ifp %p\n", __func__, ifp); 895 #endif 896 897 IFF_LOCKGIANT(ifp); 898 LIST_FOREACH_SAFE(in6m, &in6_multihead, in6m_entry, oin6m) { 899 if (in6m->in6m_ifp == ifp) 900 in6_delmulti(in6m); 901 } 902 IFF_UNLOCKGIANT(ifp); 903 }
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