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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 #include <net/net_osdep.h> 64 65 unsigned long in6_maxmtu = 0; 66 67 #ifdef IP6_AUTO_LINKLOCAL 68 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; 69 #else 70 int ip6_auto_linklocal = 1; /* enable by default */ 71 #endif 72 73 struct callout in6_tmpaddrtimer_ch; 74 75 extern struct inpcbinfo udbinfo; 76 extern struct inpcbinfo ripcbinfo; 77 78 static int get_rand_ifid(struct ifnet *, struct in6_addr *); 79 static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 80 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 81 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 82 static int in6_ifattach_loopback(struct ifnet *); 83 84 #define EUI64_GBIT 0x01 85 #define EUI64_UBIT 0x02 86 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 87 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 88 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 89 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 90 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 91 92 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 93 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 94 95 /* 96 * Generate a last-resort interface identifier, when the machine has no 97 * IEEE802/EUI64 address sources. 98 * The goal here is to get an interface identifier that is 99 * (1) random enough and (2) does not change across reboot. 100 * We currently use MD5(hostname) for it. 101 */ 102 static int 103 get_rand_ifid(ifp, in6) 104 struct ifnet *ifp; 105 struct in6_addr *in6; /* upper 64bits are preserved */ 106 { 107 MD5_CTX ctxt; 108 u_int8_t digest[16]; 109 int hostnamelen = strlen(hostname); 110 111 #if 0 112 /* we need at least several letters as seed for ifid */ 113 if (hostnamelen < 3) 114 return -1; 115 #endif 116 117 /* generate 8 bytes of pseudo-random value. */ 118 bzero(&ctxt, sizeof(ctxt)); 119 MD5Init(&ctxt); 120 MD5Update(&ctxt, hostname, hostnamelen); 121 MD5Final(digest, &ctxt); 122 123 /* assumes sizeof(digest) > sizeof(ifid) */ 124 bcopy(digest, &in6->s6_addr[8], 8); 125 126 /* make sure to set "u" bit to local, and "g" bit to individual. */ 127 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 128 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 129 130 /* convert EUI64 into IPv6 interface identifier */ 131 EUI64_TO_IFID(in6); 132 133 return 0; 134 } 135 136 static int 137 generate_tmp_ifid(seed0, seed1, ret) 138 u_int8_t *seed0, *ret; 139 const u_int8_t *seed1; 140 { 141 MD5_CTX ctxt; 142 u_int8_t seed[16], digest[16], nullbuf[8]; 143 u_int32_t val32; 144 145 /* If there's no hisotry, start with a random seed. */ 146 bzero(nullbuf, sizeof(nullbuf)); 147 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 148 int i; 149 150 for (i = 0; i < 2; i++) { 151 val32 = arc4random(); 152 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 153 } 154 } else 155 bcopy(seed0, seed, 8); 156 157 /* copy the right-most 64-bits of the given address */ 158 /* XXX assumption on the size of IFID */ 159 bcopy(seed1, &seed[8], 8); 160 161 if (0) { /* for debugging purposes only */ 162 int i; 163 164 printf("generate_tmp_ifid: new randomized ID from: "); 165 for (i = 0; i < 16; i++) 166 printf("%02x", seed[i]); 167 printf(" "); 168 } 169 170 /* generate 16 bytes of pseudo-random value. */ 171 bzero(&ctxt, sizeof(ctxt)); 172 MD5Init(&ctxt); 173 MD5Update(&ctxt, seed, sizeof(seed)); 174 MD5Final(digest, &ctxt); 175 176 /* 177 * RFC 3041 3.2.1. (3) 178 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 179 * left-most bit is numbered 0) to zero. 180 */ 181 bcopy(digest, ret, 8); 182 ret[0] &= ~EUI64_UBIT; 183 184 /* 185 * XXX: we'd like to ensure that the generated value is not zero 186 * for simplicity. If the caclculated digest happens to be zero, 187 * use a random non-zero value as the last resort. 188 */ 189 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 190 nd6log((LOG_INFO, 191 "generate_tmp_ifid: computed MD5 value is zero.\n")); 192 193 val32 = arc4random(); 194 val32 = 1 + (val32 % (0xffffffff - 1)); 195 } 196 197 /* 198 * RFC 3041 3.2.1. (4) 199 * Take the rightmost 64-bits of the MD5 digest and save them in 200 * stable storage as the history value to be used in the next 201 * iteration of the algorithm. 202 */ 203 bcopy(&digest[8], seed0, 8); 204 205 if (0) { /* for debugging purposes only */ 206 int i; 207 208 printf("to: "); 209 for (i = 0; i < 16; i++) 210 printf("%02x", digest[i]); 211 printf("\n"); 212 } 213 214 return 0; 215 } 216 217 /* 218 * Get interface identifier for the specified interface. 219 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 220 */ 221 int 222 in6_get_hw_ifid(ifp, in6) 223 struct ifnet *ifp; 224 struct in6_addr *in6; /* upper 64bits are preserved */ 225 { 226 struct ifaddr *ifa; 227 struct sockaddr_dl *sdl; 228 u_int8_t *addr; 229 size_t addrlen; 230 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 231 static u_int8_t allone[8] = 232 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 233 234 for (ifa = ifp->if_addrlist.tqh_first; 235 ifa; 236 ifa = ifa->ifa_list.tqe_next) { 237 if (ifa->ifa_addr->sa_family != AF_LINK) 238 continue; 239 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 240 if (sdl == NULL) 241 continue; 242 if (sdl->sdl_alen == 0) 243 continue; 244 245 goto found; 246 } 247 248 return -1; 249 250 found: 251 addr = LLADDR(sdl); 252 addrlen = sdl->sdl_alen; 253 254 /* get EUI64 */ 255 switch (ifp->if_type) { 256 case IFT_ETHER: 257 case IFT_FDDI: 258 case IFT_ISO88025: 259 case IFT_ATM: 260 case IFT_IEEE1394: 261 #ifdef IFT_IEEE80211 262 case IFT_IEEE80211: 263 #endif 264 /* IEEE802/EUI64 cases - what others? */ 265 /* IEEE1394 uses 16byte length address starting with EUI64 */ 266 if (addrlen > 8) 267 addrlen = 8; 268 269 /* look at IEEE802/EUI64 only */ 270 if (addrlen != 8 && addrlen != 6) 271 return -1; 272 273 /* 274 * check for invalid MAC address - on bsdi, we see it a lot 275 * since wildboar configures all-zero MAC on pccard before 276 * card insertion. 277 */ 278 if (bcmp(addr, allzero, addrlen) == 0) 279 return -1; 280 if (bcmp(addr, allone, addrlen) == 0) 281 return -1; 282 283 /* make EUI64 address */ 284 if (addrlen == 8) 285 bcopy(addr, &in6->s6_addr[8], 8); 286 else if (addrlen == 6) { 287 in6->s6_addr[8] = addr[0]; 288 in6->s6_addr[9] = addr[1]; 289 in6->s6_addr[10] = addr[2]; 290 in6->s6_addr[11] = 0xff; 291 in6->s6_addr[12] = 0xfe; 292 in6->s6_addr[13] = addr[3]; 293 in6->s6_addr[14] = addr[4]; 294 in6->s6_addr[15] = addr[5]; 295 } 296 break; 297 298 case IFT_ARCNET: 299 if (addrlen != 1) 300 return -1; 301 if (!addr[0]) 302 return -1; 303 304 bzero(&in6->s6_addr[8], 8); 305 in6->s6_addr[15] = addr[0]; 306 307 /* 308 * due to insufficient bitwidth, we mark it local. 309 */ 310 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 311 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 312 break; 313 314 case IFT_GIF: 315 #ifdef IFT_STF 316 case IFT_STF: 317 #endif 318 /* 319 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 320 * however, IPv4 address is not very suitable as unique 321 * identifier source (can be renumbered). 322 * we don't do this. 323 */ 324 return -1; 325 326 default: 327 return -1; 328 } 329 330 /* sanity check: g bit must not indicate "group" */ 331 if (EUI64_GROUP(in6)) 332 return -1; 333 334 /* convert EUI64 into IPv6 interface identifier */ 335 EUI64_TO_IFID(in6); 336 337 /* 338 * sanity check: ifid must not be all zero, avoid conflict with 339 * subnet router anycast 340 */ 341 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 342 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 343 return -1; 344 } 345 346 return 0; 347 } 348 349 /* 350 * Get interface identifier for the specified interface. If it is not 351 * available on ifp0, borrow interface identifier from other information 352 * sources. 353 */ 354 static int 355 get_ifid(ifp0, altifp, in6) 356 struct ifnet *ifp0; 357 struct ifnet *altifp; /* secondary EUI64 source */ 358 struct in6_addr *in6; 359 { 360 struct ifnet *ifp; 361 362 /* first, try to get it from the interface itself */ 363 if (in6_get_hw_ifid(ifp0, in6) == 0) { 364 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 365 if_name(ifp0))); 366 goto success; 367 } 368 369 /* try secondary EUI64 source. this basically is for ATM PVC */ 370 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 371 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 372 if_name(ifp0), if_name(altifp))); 373 goto success; 374 } 375 376 /* next, try to get it from some other hardware interface */ 377 IFNET_RLOCK(); 378 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) { 379 if (ifp == ifp0) 380 continue; 381 if (in6_get_hw_ifid(ifp, in6) != 0) 382 continue; 383 384 /* 385 * to borrow ifid from other interface, ifid needs to be 386 * globally unique 387 */ 388 if (IFID_UNIVERSAL(in6)) { 389 nd6log((LOG_DEBUG, 390 "%s: borrow interface identifier from %s\n", 391 if_name(ifp0), if_name(ifp))); 392 IFNET_RUNLOCK(); 393 goto success; 394 } 395 } 396 IFNET_RUNLOCK(); 397 398 /* last resort: get from random number source */ 399 if (get_rand_ifid(ifp, in6) == 0) { 400 nd6log((LOG_DEBUG, 401 "%s: interface identifier generated by random number\n", 402 if_name(ifp0))); 403 goto success; 404 } 405 406 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 407 return -1; 408 409 success: 410 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 411 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 412 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 413 in6->s6_addr[14], in6->s6_addr[15])); 414 return 0; 415 } 416 417 static int 418 in6_ifattach_linklocal(ifp, altifp) 419 struct ifnet *ifp; 420 struct ifnet *altifp; /* secondary EUI64 source */ 421 { 422 struct in6_ifaddr *ia; 423 struct in6_aliasreq ifra; 424 struct nd_prefixctl pr0; 425 int i, error; 426 427 /* 428 * configure link-local address. 429 */ 430 bzero(&ifra, sizeof(ifra)); 431 432 /* 433 * in6_update_ifa() does not use ifra_name, but we accurately set it 434 * for safety. 435 */ 436 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 437 438 ifra.ifra_addr.sin6_family = AF_INET6; 439 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 440 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 441 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 442 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 443 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 444 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 445 } else { 446 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 447 nd6log((LOG_ERR, 448 "%s: no ifid available\n", if_name(ifp))); 449 return (-1); 450 } 451 } 452 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 453 return (-1); 454 455 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 456 ifra.ifra_prefixmask.sin6_family = AF_INET6; 457 ifra.ifra_prefixmask.sin6_addr = in6mask64; 458 /* link-local addresses should NEVER expire. */ 459 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 460 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 461 462 /* 463 * Now call in6_update_ifa() to do a bunch of procedures to configure 464 * a link-local address. We can set the 3rd argument to NULL, because 465 * we know there's no other link-local address on the interface 466 * and therefore we are adding one (instead of updating one). 467 */ 468 if ((error = in6_update_ifa(ifp, &ifra, NULL, 469 IN6_IFAUPDATE_DADDELAY)) != 0) { 470 /* 471 * XXX: When the interface does not support IPv6, this call 472 * would fail in the SIOCSIFADDR ioctl. I believe the 473 * notification is rather confusing in this case, so just 474 * suppress it. (jinmei@kame.net 20010130) 475 */ 476 if (error != EAFNOSUPPORT) 477 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 478 "configure a link-local address on %s " 479 "(errno=%d)\n", 480 if_name(ifp), error)); 481 return (-1); 482 } 483 484 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 485 #ifdef DIAGNOSTIC 486 if (!ia) { 487 panic("ia == NULL in in6_ifattach_linklocal"); 488 /* NOTREACHED */ 489 } 490 #endif 491 492 /* 493 * Make the link-local prefix (fe80::%link/64) as on-link. 494 * Since we'd like to manage prefixes separately from addresses, 495 * we make an ND6 prefix structure for the link-local prefix, 496 * and add it to the prefix list as a never-expire prefix. 497 * XXX: this change might affect some existing code base... 498 */ 499 bzero(&pr0, sizeof(pr0)); 500 pr0.ndpr_ifp = ifp; 501 /* this should be 64 at this moment. */ 502 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 503 pr0.ndpr_prefix = ifra.ifra_addr; 504 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 505 for (i = 0; i < 4; i++) { 506 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 507 in6mask64.s6_addr32[i]; 508 } 509 /* 510 * Initialize parameters. The link-local prefix must always be 511 * on-link, and its lifetimes never expire. 512 */ 513 pr0.ndpr_raf_onlink = 1; 514 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 515 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 516 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 517 /* 518 * Since there is no other link-local addresses, nd6_prefix_lookup() 519 * probably returns NULL. However, we cannot always expect the result. 520 * For example, if we first remove the (only) existing link-local 521 * address, and then reconfigure another one, the prefix is still 522 * valid with referring to the old link-local address. 523 */ 524 if (nd6_prefix_lookup(&pr0) == NULL) { 525 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 526 return (error); 527 } 528 529 return 0; 530 } 531 532 static int 533 in6_ifattach_loopback(ifp) 534 struct ifnet *ifp; /* must be IFT_LOOP */ 535 { 536 struct in6_aliasreq ifra; 537 int error; 538 539 bzero(&ifra, sizeof(ifra)); 540 541 /* 542 * in6_update_ifa() does not use ifra_name, but we accurately set it 543 * for safety. 544 */ 545 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 546 547 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 548 ifra.ifra_prefixmask.sin6_family = AF_INET6; 549 ifra.ifra_prefixmask.sin6_addr = in6mask128; 550 551 /* 552 * Always initialize ia_dstaddr (= broadcast address) to loopback 553 * address. Follows IPv4 practice - see in_ifinit(). 554 */ 555 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 556 ifra.ifra_dstaddr.sin6_family = AF_INET6; 557 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 558 559 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 560 ifra.ifra_addr.sin6_family = AF_INET6; 561 ifra.ifra_addr.sin6_addr = in6addr_loopback; 562 563 /* the loopback address should NEVER expire. */ 564 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 565 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 566 567 /* we don't need to perform DAD on loopback interfaces. */ 568 ifra.ifra_flags |= IN6_IFF_NODAD; 569 570 /* skip registration to the prefix list. XXX should be temporary. */ 571 ifra.ifra_flags |= IN6_IFF_NOPFX; 572 573 /* 574 * We are sure that this is a newly assigned address, so we can set 575 * NULL to the 3rd arg. 576 */ 577 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 578 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 579 "the loopback address on %s (errno=%d)\n", 580 if_name(ifp), error)); 581 return (-1); 582 } 583 584 return 0; 585 } 586 587 /* 588 * compute NI group address, based on the current hostname setting. 589 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 590 * 591 * when ifp == NULL, the caller is responsible for filling scopeid. 592 */ 593 int 594 in6_nigroup(ifp, name, namelen, in6) 595 struct ifnet *ifp; 596 const char *name; 597 int namelen; 598 struct in6_addr *in6; 599 { 600 const char *p; 601 u_char *q; 602 MD5_CTX ctxt; 603 u_int8_t digest[16]; 604 char l; 605 char n[64]; /* a single label must not exceed 63 chars */ 606 607 if (!namelen || !name) 608 return -1; 609 610 p = name; 611 while (p && *p && *p != '.' && p - name < namelen) 612 p++; 613 if (p - name > sizeof(n) - 1) 614 return -1; /* label too long */ 615 l = p - name; 616 strncpy(n, name, l); 617 n[(int)l] = '\0'; 618 for (q = n; *q; q++) { 619 if ('A' <= *q && *q <= 'Z') 620 *q = *q - 'A' + 'a'; 621 } 622 623 /* generate 8 bytes of pseudo-random value. */ 624 bzero(&ctxt, sizeof(ctxt)); 625 MD5Init(&ctxt); 626 MD5Update(&ctxt, &l, sizeof(l)); 627 MD5Update(&ctxt, n, l); 628 MD5Final(digest, &ctxt); 629 630 bzero(in6, sizeof(*in6)); 631 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 632 in6->s6_addr8[11] = 2; 633 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 634 if (in6_setscope(in6, ifp, NULL)) 635 return (-1); /* XXX: should not fail */ 636 637 return 0; 638 } 639 640 /* 641 * XXX multiple loopback interface needs more care. for instance, 642 * nodelocal address needs to be configured onto only one of them. 643 * XXX multiple link-local address case 644 */ 645 void 646 in6_ifattach(ifp, altifp) 647 struct ifnet *ifp; 648 struct ifnet *altifp; /* secondary EUI64 source */ 649 { 650 struct in6_ifaddr *ia; 651 struct in6_addr in6; 652 653 /* some of the interfaces are inherently not IPv6 capable */ 654 switch (ifp->if_type) { 655 case IFT_PFLOG: 656 case IFT_PFSYNC: 657 case IFT_CARP: 658 return; 659 } 660 661 /* 662 * quirks based on interface type 663 */ 664 switch (ifp->if_type) { 665 #ifdef IFT_STF 666 case IFT_STF: 667 /* 668 * 6to4 interface is a very special kind of beast. 669 * no multicast, no linklocal. RFC2529 specifies how to make 670 * linklocals for 6to4 interface, but there's no use and 671 * it is rather harmful to have one. 672 */ 673 goto statinit; 674 #endif 675 default: 676 break; 677 } 678 679 /* 680 * usually, we require multicast capability to the interface 681 */ 682 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 683 nd6log((LOG_INFO, "in6_ifattach: " 684 "%s is not multicast capable, IPv6 not enabled\n", 685 if_name(ifp))); 686 return; 687 } 688 689 /* 690 * assign loopback address for loopback interface. 691 * XXX multiple loopback interface case. 692 */ 693 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 694 in6 = in6addr_loopback; 695 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 696 if (in6_ifattach_loopback(ifp) != 0) 697 return; 698 } 699 } 700 701 /* 702 * assign a link-local address, if there's none. 703 */ 704 if (ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) { 705 ia = in6ifa_ifpforlinklocal(ifp, 0); 706 if (ia == NULL) { 707 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 708 /* linklocal address assigned */ 709 } else { 710 /* failed to assign linklocal address. bark? */ 711 } 712 } 713 } 714 715 #ifdef IFT_STF /* XXX */ 716 statinit: 717 #endif 718 719 /* update dynamically. */ 720 if (in6_maxmtu < ifp->if_mtu) 721 in6_maxmtu = ifp->if_mtu; 722 } 723 724 /* 725 * NOTE: in6_ifdetach() does not support loopback if at this moment. 726 * We don't need this function in bsdi, because interfaces are never removed 727 * from the ifnet list in bsdi. 728 */ 729 void 730 in6_ifdetach(ifp) 731 struct ifnet *ifp; 732 { 733 struct in6_ifaddr *ia, *oia; 734 struct ifaddr *ifa, *next; 735 struct rtentry *rt; 736 short rtflags; 737 struct sockaddr_in6 sin6; 738 struct in6_multi *in6m, *in6m_next; 739 struct in6_multi_mship *imm; 740 741 /* remove neighbor management table */ 742 nd6_purge(ifp); 743 744 /* nuke any of IPv6 addresses we have */ 745 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) { 746 next = ifa->ifa_list.tqe_next; 747 if (ifa->ifa_addr->sa_family != AF_INET6) 748 continue; 749 in6_purgeaddr(ifa); 750 } 751 752 /* undo everything done by in6_ifattach(), just in case */ 753 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) { 754 next = ifa->ifa_list.tqe_next; 755 756 if (ifa->ifa_addr->sa_family != AF_INET6 757 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 758 continue; 759 } 760 761 ia = (struct in6_ifaddr *)ifa; 762 763 /* 764 * leave from multicast groups we have joined for the interface 765 */ 766 while ((imm = ia->ia6_memberships.lh_first) != NULL) { 767 LIST_REMOVE(imm, i6mm_chain); 768 in6_leavegroup(imm); 769 } 770 771 /* remove from the routing table */ 772 if ((ia->ia_flags & IFA_ROUTE) && 773 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 774 rtflags = rt->rt_flags; 775 RTFREE_LOCKED(rt); 776 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 777 (struct sockaddr *)&ia->ia_addr, 778 (struct sockaddr *)&ia->ia_prefixmask, 779 rtflags, (struct rtentry **)0); 780 } 781 782 /* remove from the linked list */ 783 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 784 IFAFREE(&ia->ia_ifa); 785 786 /* also remove from the IPv6 address chain(itojun&jinmei) */ 787 oia = ia; 788 if (oia == (ia = in6_ifaddr)) 789 in6_ifaddr = ia->ia_next; 790 else { 791 while (ia->ia_next && (ia->ia_next != oia)) 792 ia = ia->ia_next; 793 if (ia->ia_next) 794 ia->ia_next = oia->ia_next; 795 else { 796 nd6log((LOG_ERR, 797 "%s: didn't unlink in6ifaddr from list\n", 798 if_name(ifp))); 799 } 800 } 801 802 IFAFREE(&oia->ia_ifa); 803 } 804 805 /* leave from all multicast groups joined */ 806 807 if (udbinfo.listhead != NULL) 808 in6_pcbpurgeif0(LIST_FIRST(udbinfo.listhead), ifp); 809 if (ripcbinfo.listhead != NULL) 810 in6_pcbpurgeif0(LIST_FIRST(ripcbinfo.listhead), ifp); 811 812 for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) { 813 in6m_next = LIST_NEXT(in6m, in6m_entry); 814 if (in6m->in6m_ifp != ifp) 815 continue; 816 printf("in6_ifdetach: in6m=%p (ref=%d), ifp=%p\n", in6m, 817 in6m->in6m_ifma->ifma_refcount, ifp); 818 in6_delmulti(in6m); 819 in6m = NULL; 820 } 821 822 /* 823 * remove neighbor management table. we call it twice just to make 824 * sure we nuke everything. maybe we need just one call. 825 * XXX: since the first call did not release addresses, some prefixes 826 * might remain. We should call nd6_purge() again to release the 827 * prefixes after removing all addresses above. 828 * (Or can we just delay calling nd6_purge until at this point?) 829 */ 830 nd6_purge(ifp); 831 832 /* remove route to link-local allnodes multicast (ff02::1) */ 833 bzero(&sin6, sizeof(sin6)); 834 sin6.sin6_len = sizeof(struct sockaddr_in6); 835 sin6.sin6_family = AF_INET6; 836 sin6.sin6_addr = in6addr_linklocal_allnodes; 837 if (in6_setscope(&sin6.sin6_addr, ifp, NULL)) 838 /* XXX: should not fail */ 839 return; 840 /* XXX grab lock first to avoid LOR */ 841 if (rt_tables[AF_INET6] != NULL) { 842 RADIX_NODE_HEAD_LOCK(rt_tables[AF_INET6]); 843 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 844 if (rt) { 845 if (rt->rt_ifp == ifp) 846 rtexpunge(rt); 847 RTFREE_LOCKED(rt); 848 } 849 RADIX_NODE_HEAD_UNLOCK(rt_tables[AF_INET6]); 850 } 851 } 852 853 int 854 in6_get_tmpifid(ifp, retbuf, baseid, generate) 855 struct ifnet *ifp; 856 u_int8_t *retbuf; 857 const u_int8_t *baseid; 858 int generate; 859 { 860 u_int8_t nullbuf[8]; 861 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 862 863 bzero(nullbuf, sizeof(nullbuf)); 864 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 865 /* we've never created a random ID. Create a new one. */ 866 generate = 1; 867 } 868 869 if (generate) { 870 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 871 872 /* generate_tmp_ifid will update seedn and buf */ 873 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 874 ndi->randomid); 875 } 876 bcopy(ndi->randomid, retbuf, 8); 877 878 return (0); 879 } 880 881 void 882 in6_tmpaddrtimer(ignored_arg) 883 void *ignored_arg; 884 { 885 struct nd_ifinfo *ndi; 886 u_int8_t nullbuf[8]; 887 struct ifnet *ifp; 888 int s = splnet(); 889 890 callout_reset(&in6_tmpaddrtimer_ch, 891 (ip6_temp_preferred_lifetime - ip6_desync_factor - 892 ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL); 893 894 bzero(nullbuf, sizeof(nullbuf)); 895 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 896 ndi = ND_IFINFO(ifp); 897 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 898 /* 899 * We've been generating a random ID on this interface. 900 * Create a new one. 901 */ 902 (void)generate_tmp_ifid(ndi->randomseed0, 903 ndi->randomseed1, ndi->randomid); 904 } 905 } 906 907 splx(s); 908 }
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