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sys/netinet6/in6_ifattach.c
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1 /*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $ 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/malloc.h> 38 #include <sys/socket.h> 39 #include <sys/sockio.h> 40 #include <sys/kernel.h> 41 #include <sys/syslog.h> 42 #include <sys/md5.h> 43 44 #include <net/if.h> 45 #include <net/if_dl.h> 46 #include <net/if_types.h> 47 #include <net/route.h> 48 49 #include <netinet/in.h> 50 #include <netinet/in_var.h> 51 #include <netinet/if_ether.h> 52 #include <netinet/in_pcb.h> 53 54 #include <netinet/ip6.h> 55 #include <netinet6/ip6_var.h> 56 #include <netinet6/in6_var.h> 57 #include <netinet6/in6_pcb.h> 58 #include <netinet6/in6_ifattach.h> 59 #include <netinet6/ip6_var.h> 60 #include <netinet6/nd6.h> 61 #include <netinet6/scope6_var.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(struct ifnet *, struct in6_addr *); 77 static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 78 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 79 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 80 static int in6_ifattach_loopback(struct ifnet *); 81 static void in6_purgemaddrs(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 * in6 - upper 64bits are preserved 102 */ 103 static int 104 get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 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(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 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 history, 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 * in6 - upper 64bits are preserved 219 */ 220 int 221 in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 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 * altifp - secondary EUI64 source 352 */ 353 static int 354 get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 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 /* 415 * altifp - secondary EUI64 source 416 */ 417 static int 418 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 419 { 420 struct in6_ifaddr *ia; 421 struct in6_aliasreq ifra; 422 struct nd_prefixctl pr0; 423 int i, error; 424 425 /* 426 * configure link-local address. 427 */ 428 bzero(&ifra, sizeof(ifra)); 429 430 /* 431 * in6_update_ifa() does not use ifra_name, but we accurately set it 432 * for safety. 433 */ 434 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 435 436 ifra.ifra_addr.sin6_family = AF_INET6; 437 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 438 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 439 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 440 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 441 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 442 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 443 } else { 444 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 445 nd6log((LOG_ERR, 446 "%s: no ifid available\n", if_name(ifp))); 447 return (-1); 448 } 449 } 450 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 451 return (-1); 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 * Now call in6_update_ifa() to do a bunch of procedures to configure 462 * a link-local address. We can set the 3rd argument to NULL, because 463 * we know there's no other link-local address on the interface 464 * and therefore we are adding one (instead of updating one). 465 */ 466 if ((error = in6_update_ifa(ifp, &ifra, NULL, 467 IN6_IFAUPDATE_DADDELAY)) != 0) { 468 /* 469 * XXX: When the interface does not support IPv6, this call 470 * would fail in the SIOCSIFADDR ioctl. I believe the 471 * notification is rather confusing in this case, so just 472 * suppress it. (jinmei@kame.net 20010130) 473 */ 474 if (error != EAFNOSUPPORT) 475 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 476 "configure a link-local address on %s " 477 "(errno=%d)\n", 478 if_name(ifp), error)); 479 return (-1); 480 } 481 482 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 483 KASSERT(ia != NULL, ("%s: ia == NULL, ifp=%p", __func__, ifp)); 484 485 /* 486 * Make the link-local prefix (fe80::%link/64) as on-link. 487 * Since we'd like to manage prefixes separately from addresses, 488 * we make an ND6 prefix structure for the link-local prefix, 489 * and add it to the prefix list as a never-expire prefix. 490 * XXX: this change might affect some existing code base... 491 */ 492 bzero(&pr0, sizeof(pr0)); 493 pr0.ndpr_ifp = ifp; 494 /* this should be 64 at this moment. */ 495 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 496 pr0.ndpr_prefix = ifra.ifra_addr; 497 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 498 for (i = 0; i < 4; i++) { 499 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 500 in6mask64.s6_addr32[i]; 501 } 502 /* 503 * Initialize parameters. The link-local prefix must always be 504 * on-link, and its lifetimes never expire. 505 */ 506 pr0.ndpr_raf_onlink = 1; 507 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 508 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 509 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 510 /* 511 * Since there is no other link-local addresses, nd6_prefix_lookup() 512 * probably returns NULL. However, we cannot always expect the result. 513 * For example, if we first remove the (only) existing link-local 514 * address, and then reconfigure another one, the prefix is still 515 * valid with referring to the old link-local address. 516 */ 517 if (nd6_prefix_lookup(&pr0) == NULL) { 518 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 519 return (error); 520 } 521 522 return 0; 523 } 524 525 /* 526 * ifp - must be IFT_LOOP 527 */ 528 static int 529 in6_ifattach_loopback(struct ifnet *ifp) 530 { 531 struct in6_aliasreq ifra; 532 int error; 533 534 bzero(&ifra, sizeof(ifra)); 535 536 /* 537 * in6_update_ifa() does not use ifra_name, but we accurately set it 538 * for safety. 539 */ 540 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 541 542 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 543 ifra.ifra_prefixmask.sin6_family = AF_INET6; 544 ifra.ifra_prefixmask.sin6_addr = in6mask128; 545 546 /* 547 * Always initialize ia_dstaddr (= broadcast address) to loopback 548 * address. Follows IPv4 practice - see in_ifinit(). 549 */ 550 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 551 ifra.ifra_dstaddr.sin6_family = AF_INET6; 552 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 553 554 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 555 ifra.ifra_addr.sin6_family = AF_INET6; 556 ifra.ifra_addr.sin6_addr = in6addr_loopback; 557 558 /* the loopback address should NEVER expire. */ 559 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 560 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 561 562 /* we don't need to perform DAD on loopback interfaces. */ 563 ifra.ifra_flags |= IN6_IFF_NODAD; 564 565 /* skip registration to the prefix list. XXX should be temporary. */ 566 ifra.ifra_flags |= IN6_IFF_NOPFX; 567 568 /* 569 * We are sure that this is a newly assigned address, so we can set 570 * NULL to the 3rd arg. 571 */ 572 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 573 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 574 "the loopback address on %s (errno=%d)\n", 575 if_name(ifp), error)); 576 return (-1); 577 } 578 579 return 0; 580 } 581 582 /* 583 * compute NI group address, based on the current hostname setting. 584 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 585 * 586 * when ifp == NULL, the caller is responsible for filling scopeid. 587 */ 588 int 589 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 590 struct in6_addr *in6) 591 { 592 const char *p; 593 u_char *q; 594 MD5_CTX ctxt; 595 u_int8_t digest[16]; 596 char l; 597 char n[64]; /* a single label must not exceed 63 chars */ 598 599 if (!namelen || !name) 600 return -1; 601 602 p = name; 603 while (p && *p && *p != '.' && p - name < namelen) 604 p++; 605 if (p - name > sizeof(n) - 1) 606 return -1; /* label too long */ 607 l = p - name; 608 strncpy(n, name, l); 609 n[(int)l] = '\0'; 610 for (q = n; *q; q++) { 611 if ('A' <= *q && *q <= 'Z') 612 *q = *q - 'A' + 'a'; 613 } 614 615 /* generate 8 bytes of pseudo-random value. */ 616 bzero(&ctxt, sizeof(ctxt)); 617 MD5Init(&ctxt); 618 MD5Update(&ctxt, &l, sizeof(l)); 619 MD5Update(&ctxt, n, l); 620 MD5Final(digest, &ctxt); 621 622 bzero(in6, sizeof(*in6)); 623 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 624 in6->s6_addr8[11] = 2; 625 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 626 if (in6_setscope(in6, ifp, NULL)) 627 return (-1); /* XXX: should not fail */ 628 629 return 0; 630 } 631 632 /* 633 * XXX multiple loopback interface needs more care. for instance, 634 * nodelocal address needs to be configured onto only one of them. 635 * XXX multiple link-local address case 636 * 637 * altifp - secondary EUI64 source 638 */ 639 void 640 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 641 { 642 struct in6_ifaddr *ia; 643 struct in6_addr in6; 644 645 /* some of the interfaces are inherently not IPv6 capable */ 646 switch (ifp->if_type) { 647 case IFT_PFLOG: 648 case IFT_PFSYNC: 649 case IFT_CARP: 650 return; 651 } 652 653 /* 654 * quirks based on interface type 655 */ 656 switch (ifp->if_type) { 657 #ifdef IFT_STF 658 case IFT_STF: 659 /* 660 * 6to4 interface is a very special kind of beast. 661 * no multicast, no linklocal. RFC2529 specifies how to make 662 * linklocals for 6to4 interface, but there's no use and 663 * it is rather harmful to have one. 664 */ 665 goto statinit; 666 #endif 667 default: 668 break; 669 } 670 671 /* 672 * usually, we require multicast capability to the interface 673 */ 674 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 675 nd6log((LOG_INFO, "in6_ifattach: " 676 "%s is not multicast capable, IPv6 not enabled\n", 677 if_name(ifp))); 678 return; 679 } 680 681 /* 682 * assign loopback address for loopback interface. 683 * XXX multiple loopback interface case. 684 */ 685 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 686 in6 = in6addr_loopback; 687 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 688 if (in6_ifattach_loopback(ifp) != 0) 689 return; 690 } 691 } 692 693 /* 694 * assign a link-local address, if there's none. 695 */ 696 if (ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) { 697 ia = in6ifa_ifpforlinklocal(ifp, 0); 698 if (ia == NULL) { 699 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 700 /* linklocal address assigned */ 701 } else { 702 /* failed to assign linklocal address. bark? */ 703 } 704 } 705 } 706 707 #ifdef IFT_STF /* XXX */ 708 statinit: 709 #endif 710 711 /* update dynamically. */ 712 if (in6_maxmtu < ifp->if_mtu) 713 in6_maxmtu = ifp->if_mtu; 714 } 715 716 /* 717 * NOTE: in6_ifdetach() does not support loopback if at this moment. 718 * We don't need this function in bsdi, because interfaces are never removed 719 * from the ifnet list in bsdi. 720 */ 721 void 722 in6_ifdetach(struct ifnet *ifp) 723 { 724 struct in6_ifaddr *ia, *oia; 725 struct ifaddr *ifa, *next; 726 struct rtentry *rt; 727 short rtflags; 728 struct sockaddr_in6 sin6; 729 struct in6_multi_mship *imm; 730 731 /* remove neighbor management table */ 732 nd6_purge(ifp); 733 734 /* nuke any of IPv6 addresses we have */ 735 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) { 736 next = ifa->ifa_list.tqe_next; 737 if (ifa->ifa_addr->sa_family != AF_INET6) 738 continue; 739 in6_purgeaddr(ifa); 740 } 741 742 /* undo everything done by in6_ifattach(), just in case */ 743 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) { 744 next = ifa->ifa_list.tqe_next; 745 746 if (ifa->ifa_addr->sa_family != AF_INET6 747 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 748 continue; 749 } 750 751 ia = (struct in6_ifaddr *)ifa; 752 753 /* 754 * leave from multicast groups we have joined for the interface 755 */ 756 while ((imm = ia->ia6_memberships.lh_first) != NULL) { 757 LIST_REMOVE(imm, i6mm_chain); 758 in6_leavegroup(imm); 759 } 760 761 /* remove from the routing table */ 762 if ((ia->ia_flags & IFA_ROUTE) && 763 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 764 rtflags = rt->rt_flags; 765 RTFREE_LOCKED(rt); 766 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 767 (struct sockaddr *)&ia->ia_addr, 768 (struct sockaddr *)&ia->ia_prefixmask, 769 rtflags, (struct rtentry **)0); 770 } 771 772 /* remove from the linked list */ 773 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 774 IFAFREE(&ia->ia_ifa); 775 776 /* also remove from the IPv6 address chain(itojun&jinmei) */ 777 oia = ia; 778 if (oia == (ia = in6_ifaddr)) 779 in6_ifaddr = ia->ia_next; 780 else { 781 while (ia->ia_next && (ia->ia_next != oia)) 782 ia = ia->ia_next; 783 if (ia->ia_next) 784 ia->ia_next = oia->ia_next; 785 else { 786 nd6log((LOG_ERR, 787 "%s: didn't unlink in6ifaddr from list\n", 788 if_name(ifp))); 789 } 790 } 791 792 IFAFREE(&oia->ia_ifa); 793 } 794 795 in6_pcbpurgeif0(&udbinfo, ifp); 796 in6_pcbpurgeif0(&ripcbinfo, ifp); 797 /* leave from all multicast groups joined */ 798 in6_purgemaddrs(ifp); 799 800 /* 801 * remove neighbor management table. we call it twice just to make 802 * sure we nuke everything. maybe we need just one call. 803 * XXX: since the first call did not release addresses, some prefixes 804 * might remain. We should call nd6_purge() again to release the 805 * prefixes after removing all addresses above. 806 * (Or can we just delay calling nd6_purge until at this point?) 807 */ 808 nd6_purge(ifp); 809 810 /* remove route to link-local allnodes multicast (ff02::1) */ 811 bzero(&sin6, sizeof(sin6)); 812 sin6.sin6_len = sizeof(struct sockaddr_in6); 813 sin6.sin6_family = AF_INET6; 814 sin6.sin6_addr = in6addr_linklocal_allnodes; 815 if (in6_setscope(&sin6.sin6_addr, ifp, NULL)) 816 /* XXX: should not fail */ 817 return; 818 /* XXX grab lock first to avoid LOR */ 819 if (rt_tables[0][AF_INET6] != NULL) { 820 RADIX_NODE_HEAD_LOCK(rt_tables[0][AF_INET6]); 821 rt = rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED); 822 if (rt) { 823 if (rt->rt_ifp == ifp) 824 rtexpunge(rt); 825 RTFREE_LOCKED(rt); 826 } 827 RADIX_NODE_HEAD_UNLOCK(rt_tables[0][AF_INET6]); 828 } 829 } 830 831 int 832 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 833 const u_int8_t *baseid, int generate) 834 { 835 u_int8_t nullbuf[8]; 836 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 837 838 bzero(nullbuf, sizeof(nullbuf)); 839 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 840 /* we've never created a random ID. Create a new one. */ 841 generate = 1; 842 } 843 844 if (generate) { 845 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 846 847 /* generate_tmp_ifid will update seedn and buf */ 848 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 849 ndi->randomid); 850 } 851 bcopy(ndi->randomid, retbuf, 8); 852 853 return (0); 854 } 855 856 void 857 in6_tmpaddrtimer(void *ignored_arg) 858 { 859 struct nd_ifinfo *ndi; 860 u_int8_t nullbuf[8]; 861 struct ifnet *ifp; 862 int s = splnet(); 863 864 callout_reset(&in6_tmpaddrtimer_ch, 865 (ip6_temp_preferred_lifetime - ip6_desync_factor - 866 ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL); 867 868 bzero(nullbuf, sizeof(nullbuf)); 869 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 870 ndi = ND_IFINFO(ifp); 871 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 872 /* 873 * We've been generating a random ID on this interface. 874 * Create a new one. 875 */ 876 (void)generate_tmp_ifid(ndi->randomseed0, 877 ndi->randomseed1, ndi->randomid); 878 } 879 } 880 881 splx(s); 882 } 883 884 static void 885 in6_purgemaddrs(struct ifnet *ifp) 886 { 887 struct in6_multi *in6m; 888 struct in6_multi *oin6m; 889 890 #ifdef DIAGNOSTIC 891 printf("%s: purging ifp %p\n", __func__, ifp); 892 #endif 893 894 IFF_LOCKGIANT(ifp); 895 LIST_FOREACH_SAFE(in6m, &in6_multihead, in6m_entry, oin6m) { 896 if (in6m->in6m_ifp == ifp) 897 in6_delmulti(in6m); 898 } 899 IFF_UNLOCKGIANT(ifp); 900 }
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