1 /* $FreeBSD: src/sys/netinet6/in6_ifattach.c,v 1.2.2.6 2002/04/28 05:40:26 suz Exp $ */ 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 #include <sys/thread2.h> 42 43 #include <net/if.h> 44 #include <net/if_dl.h> 45 #include <net/if_types.h> 46 #include <net/route.h> 47 #include <net/netisr2.h> 48 #include <net/netmsg2.h> 49 50 #include <netinet/in.h> 51 #include <netinet/in_var.h> 52 #include <netinet/if_ether.h> 53 #include <netinet/in_pcb.h> 54 #include <netinet/udp_var.h> 55 56 #include <netinet/ip6.h> 57 #include <netinet6/ip6_var.h> 58 #include <netinet6/in6_var.h> 59 #include <netinet6/in6_pcb.h> 60 #include <netinet6/in6_ifattach.h> 61 #include <netinet6/nd6.h> 62 #include <netinet6/scope6_var.h> 63 64 #include <net/net_osdep.h> 65 66 unsigned long in6_maxmtu = 0; 67 68 #ifdef IP6_AUTO_LINKLOCAL 69 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; 70 #else 71 int ip6_auto_linklocal = 1; /* enable by default */ 72 #endif 73 74 static struct callout in6_tmpaddrtimer_ch; 75 static struct netmsg_base in6_tmpaddrtimer_netmsg; 76 77 extern struct inpcbinfo ripcbinfo; 78 79 static int get_rand_ifid (struct in6_addr *); 80 static int generate_tmp_ifid (u_int8_t *, const u_int8_t *, u_int8_t *); 81 static int get_hw_ifid (struct ifnet *, struct in6_addr *); 82 static int get_ifid (struct ifnet *, struct ifnet *, struct in6_addr *); 83 static int in6_ifattach_linklocal (struct ifnet *, struct ifnet *); 84 static int in6_ifattach_loopback (struct ifnet *); 85 86 #define EUI64_GBIT 0x01 87 #define EUI64_UBIT 0x02 88 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 89 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 90 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 91 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 92 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 93 94 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 95 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 96 97 /* 98 * Generate a last-resort interface identifier, when the machine has no 99 * IEEE802/EUI64 address sources. 100 * The goal here is to get an interface identifier that is 101 * (1) random enough and (2) does not change across reboot. 102 * We currently use MD5(hostname) for it. 103 */ 104 static int 105 get_rand_ifid(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(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 138 { 139 MD5_CTX ctxt; 140 u_int8_t seed[16], digest[16], nullbuf[8]; 141 u_int32_t val32; 142 struct timeval tv; 143 144 /* If there's no hisotry, start with a random seed. */ 145 bzero(nullbuf, sizeof(nullbuf)); 146 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 147 int i; 148 149 for (i = 0; i < 2; i++) { 150 microtime(&tv); 151 val32 = krandom() ^ tv.tv_usec; 152 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 153 } 154 } else { 155 bcopy(seed0, seed, 8); 156 } 157 158 /* copy the right-most 64-bits of the given address */ 159 /* XXX assumption on the size of IFID */ 160 bcopy(seed1, &seed[8], 8); 161 162 if (0) { /* for debugging purposes only */ 163 int i; 164 165 kprintf("generate_tmp_ifid: new randomized ID from: "); 166 for (i = 0; i < 16; i++) 167 kprintf("%02x", seed[i]); 168 kprintf(" "); 169 } 170 171 /* generate 16 bytes of pseudo-random value. */ 172 bzero(&ctxt, sizeof(ctxt)); 173 MD5Init(&ctxt); 174 MD5Update(&ctxt, seed, sizeof(seed)); 175 MD5Final(digest, &ctxt); 176 177 /* 178 * RFC 3041 3.2.1. (3) 179 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 180 * left-most bit is numbered 0) to zero. 181 */ 182 bcopy(digest, ret, 8); 183 ret[0] &= ~EUI64_UBIT; 184 185 /* 186 * XXX: we'd like to ensure that the generated value is not zero 187 * for simplicity. If the caclculated digest happens to be zero, 188 * use a random non-zero value as the last resort. 189 */ 190 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 191 log(LOG_INFO, 192 "generate_tmp_ifid: computed MD5 value is zero.\n"); 193 194 microtime(&tv); 195 val32 = krandom() ^ tv.tv_usec; 196 val32 = 1 + (val32 % (0xffffffff - 1)); 197 } 198 199 /* 200 * RFC 3041 3.2.1. (4) 201 * Take the rightmost 64-bits of the MD5 digest and save them in 202 * stable storage as the history value to be used in the next 203 * iteration of the algorithm. 204 */ 205 bcopy(&digest[8], seed0, 8); 206 207 if (0) { /* for debugging purposes only */ 208 int i; 209 210 kprintf("to: "); 211 for (i = 0; i < 16; i++) 212 kprintf("%02x", digest[i]); 213 kprintf("\n"); 214 } 215 216 return 0; 217 } 218 219 /* 220 * Get interface identifier for the specified interface. 221 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 222 */ 223 static int 224 get_hw_ifid(struct ifnet *ifp, 225 struct in6_addr *in6) /* upper 64bits are preserved */ 226 { 227 struct ifaddr_container *ifac; 228 struct sockaddr_dl *sdl; 229 u_int8_t *addr; 230 size_t addrlen; 231 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 232 static u_int8_t allone[8] = 233 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 234 235 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 236 struct ifaddr *ifa = ifac->ifa; 237 238 if (ifa->ifa_addr->sa_family != AF_LINK) 239 continue; 240 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 241 if (sdl == NULL) 242 continue; 243 if (sdl->sdl_alen == 0) 244 continue; 245 246 goto found; 247 } 248 249 return -1; 250 251 found: 252 addr = LLADDR(sdl); 253 addrlen = sdl->sdl_alen; 254 255 /* get EUI64 */ 256 switch (ifp->if_type) { 257 case IFT_ETHER: 258 case IFT_ATM: 259 case IFT_IEEE1394: 260 #ifdef IFT_IEEE80211 261 case IFT_IEEE80211: 262 #endif 263 /* IEEE802/EUI64 cases - what others? */ 264 /* IEEE1394 uses 16byte length address starting with EUI64 */ 265 if (addrlen > 8) 266 addrlen = 8; 267 268 /* look at IEEE802/EUI64 only */ 269 if (addrlen != 8 && addrlen != 6) 270 return -1; 271 272 /* 273 * check for invalid MAC address - on bsdi, we see it a lot 274 * since wildboar configures all-zero MAC on pccard before 275 * card insertion. 276 */ 277 if (bcmp(addr, allzero, addrlen) == 0) 278 return -1; 279 if (bcmp(addr, allone, addrlen) == 0) 280 return -1; 281 282 /* make EUI64 address */ 283 if (addrlen == 8) 284 bcopy(addr, &in6->s6_addr[8], 8); 285 else if (addrlen == 6) { 286 in6->s6_addr[8] = addr[0]; 287 in6->s6_addr[9] = addr[1]; 288 in6->s6_addr[10] = addr[2]; 289 in6->s6_addr[11] = 0xff; 290 in6->s6_addr[12] = 0xfe; 291 in6->s6_addr[13] = addr[3]; 292 in6->s6_addr[14] = addr[4]; 293 in6->s6_addr[15] = addr[5]; 294 } 295 break; 296 case IFT_GIF: 297 #ifdef IFT_STF 298 case IFT_STF: 299 #endif 300 /* 301 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 302 * however, IPv4 address is not very suitable as unique 303 * identifier source (can be renumbered). 304 * we don't do this. 305 */ 306 return -1; 307 308 default: 309 return -1; 310 } 311 312 /* sanity check: g bit must not indicate "group" */ 313 if (EUI64_GROUP(in6)) 314 return -1; 315 316 /* convert EUI64 into IPv6 interface identifier */ 317 EUI64_TO_IFID(in6); 318 319 /* 320 * sanity check: ifid must not be all zero, avoid conflict with 321 * subnet router anycast 322 */ 323 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 324 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 325 return -1; 326 } 327 328 return 0; 329 } 330 331 /* 332 * Get interface identifier for the specified interface. If it is not 333 * available on ifp0, borrow interface identifier from other information 334 * sources. 335 */ 336 static int 337 get_ifid(struct ifnet *ifp0, 338 struct ifnet *altifp, /* secondary EUI64 source */ 339 struct in6_addr *in6) 340 { 341 const struct ifnet_array *arr; 342 int i; 343 344 /* first, try to get it from the interface itself */ 345 if (get_hw_ifid(ifp0, in6) == 0) { 346 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 347 if_name(ifp0))); 348 goto success; 349 } 350 351 /* try secondary EUI64 source. this basically is for ATM PVC */ 352 if (altifp && get_hw_ifid(altifp, in6) == 0) { 353 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 354 if_name(ifp0), if_name(altifp))); 355 goto success; 356 } 357 358 /* next, try to get it from some other hardware interface */ 359 arr = ifnet_array_get(); 360 for (i = 0; i < arr->ifnet_count; ++i) { 361 struct ifnet *ifp = arr->ifnet_arr[i]; 362 363 if (ifp == ifp0) 364 continue; 365 if (get_hw_ifid(ifp, in6) != 0) 366 continue; 367 368 /* 369 * to borrow ifid from other interface, ifid needs to be 370 * globally unique 371 */ 372 if (IFID_UNIVERSAL(in6)) { 373 nd6log((LOG_DEBUG, 374 "%s: borrow interface identifier from %s\n", 375 if_name(ifp0), if_name(ifp))); 376 goto success; 377 } 378 } 379 380 /* last resort: get from random number source */ 381 if (get_rand_ifid(in6) == 0) { 382 nd6log((LOG_DEBUG, 383 "%s: interface identifier generated by random number\n", 384 if_name(ifp0))); 385 goto success; 386 } 387 388 kprintf("%s: failed to get interface identifier\n", if_name(ifp0)); 389 return -1; 390 391 success: 392 nd6log((LOG_INFO, "%s: ifid: " 393 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 394 if_name(ifp0), 395 in6->s6_addr[8], in6->s6_addr[9], 396 in6->s6_addr[10], in6->s6_addr[11], 397 in6->s6_addr[12], in6->s6_addr[13], 398 in6->s6_addr[14], in6->s6_addr[15])); 399 return 0; 400 } 401 402 static int 403 in6_ifattach_linklocal(struct ifnet *ifp, 404 struct ifnet *altifp) /* secondary EUI64 source */ 405 { 406 struct in6_ifaddr *ia; 407 struct in6_aliasreq ifra; 408 struct nd_prefix pr0; 409 int i, error; 410 411 /* 412 * configure link-local address. 413 */ 414 bzero(&ifra, sizeof(ifra)); 415 416 /* 417 * in6_update_ifa() does not use ifra_name, but we accurately set it 418 * for safety. 419 */ 420 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 421 422 ifra.ifra_addr.sin6_family = AF_INET6; 423 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 424 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 425 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); /* XXX */ 426 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 427 if (ifp->if_flags & IFF_LOOPBACK) { 428 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 429 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 430 } else { 431 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 432 nd6log((LOG_ERR, 433 "%s: no ifid available\n", if_name(ifp))); 434 return -1; 435 } 436 } 437 438 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 439 ifra.ifra_prefixmask.sin6_family = AF_INET6; 440 ifra.ifra_prefixmask.sin6_addr = in6mask64; 441 442 /* link-local addresses should NEVER expire. */ 443 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 444 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 445 446 /* 447 * Do not let in6_update_ifa() do DAD, since we need a random delay 448 * before sending an NS at the first time the interface becomes up. 449 * Instead, in6_if_up() will start DAD with a proper random delay. 450 */ 451 ifra.ifra_flags |= IN6_IFF_NODAD; 452 453 /* 454 * Now call in6_update_ifa() to do a bunch of procedures to configure 455 * a link-local address. We can set NULL to the 3rd argument, because 456 * we know there's no other link-local address on the interface 457 * and therefore we are adding one (instead of updating one). 458 */ 459 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 460 /* 461 * XXX: When the interface does not support IPv6, this call 462 * would fail in the SIOCSIFADDR ioctl. I believe the 463 * notification is rather confusing in this case, so just 464 * suppress it. (jinmei@kame.net 20010130) 465 */ 466 if (error != EAFNOSUPPORT) 467 log(LOG_NOTICE, "in6_ifattach_linklocal: failed to " 468 "configure a link-local address on %s " 469 "(errno=%d)\n", 470 if_name(ifp), error); 471 return (-1); 472 } 473 474 /* 475 * Adjust ia6_flags so that in6_if_up will perform DAD. 476 * XXX: Some P2P interfaces seem not to send packets just after 477 * becoming up, so we skip p2p interfaces for safety. 478 */ 479 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 480 #ifdef DIAGNOSTIC 481 if (!ia) { 482 panic("ia == NULL in in6_ifattach_linklocal"); 483 /* NOTREACHED */ 484 } 485 #endif 486 if (in6if_do_dad(ifp) && !(ifp->if_flags & IFF_POINTOPOINT)) { 487 ia->ia6_flags &= ~IN6_IFF_NODAD; 488 ia->ia6_flags |= IN6_IFF_TENTATIVE; 489 } 490 491 /* 492 * Make the link-local prefix (fe80::%link/64) as on-link. 493 * Since we'd like to manage prefixes separately from addresses, 494 * we make an ND6 prefix structure for the link-local prefix, 495 * and add it to the prefix list as a never-expire prefix. 496 * XXX: this change might affect some existing code base... 497 */ 498 bzero(&pr0, sizeof(pr0)); 499 pr0.ndpr_ifp = ifp; 500 /* this should be 64 at this moment. */ 501 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 502 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 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(struct ifnet *ifp) /* must be IFT_LOOP */ 534 { 535 struct in6_aliasreq ifra; 536 int error; 537 538 bzero(&ifra, sizeof(ifra)); 539 540 /* 541 * in6_update_ifa() does not use ifra_name, but we accurately set it 542 * for safety. 543 */ 544 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 545 546 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 547 ifra.ifra_prefixmask.sin6_family = AF_INET6; 548 ifra.ifra_prefixmask.sin6_addr = in6mask128; 549 550 /* 551 * Always initialize ia_dstaddr (= broadcast address) to loopback 552 * address. Follows IPv4 practice - see in_ifinit(). 553 */ 554 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 555 ifra.ifra_dstaddr.sin6_family = AF_INET6; 556 ifra.ifra_dstaddr.sin6_addr = kin6addr_loopback; 557 558 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 559 ifra.ifra_addr.sin6_family = AF_INET6; 560 ifra.ifra_addr.sin6_addr = kin6addr_loopback; 561 562 /* the loopback address should NEVER expire. */ 563 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 564 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 565 566 /* we don't need to perform DAD on loopback interfaces. */ 567 ifra.ifra_flags |= IN6_IFF_NODAD; 568 569 /* skip registration to the prefix list. XXX should be temporary. */ 570 ifra.ifra_flags |= IN6_IFF_NOPFX; 571 572 /* 573 * We are sure that this is a newly assigned address, so we can set 574 * NULL to the 3rd arg. 575 */ 576 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 577 log(LOG_ERR, "in6_ifattach_loopback: failed to configure " 578 "the loopback address on %s (errno=%d)\n", 579 if_name(ifp), error); 580 return (-1); 581 } 582 583 return 0; 584 } 585 586 /* 587 * compute NI group address, based on the current hostname setting. 588 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 589 * 590 * when ifp == NULL, the caller is responsible for filling scopeid. 591 */ 592 int 593 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 594 struct in6_addr *in6) 595 { 596 const char *p; 597 u_char *q; 598 MD5_CTX ctxt; 599 u_int8_t digest[16]; 600 char l; 601 char n[64]; /* a single label must not exceed 63 chars */ 602 603 if (!namelen || !name) 604 return -1; 605 606 p = name; 607 while (p && *p && *p != '.' && p - name < namelen) 608 p++; 609 if (p - name > sizeof(n) - 1) 610 return -1; /* label too long */ 611 l = p - name; 612 strncpy(n, name, l); 613 n[(int)l] = '\0'; 614 for (q = n; *q; q++) { 615 if ('A' <= *q && *q <= 'Z') 616 *q = *q - 'A' + 'a'; 617 } 618 619 /* generate 8 bytes of pseudo-random value. */ 620 bzero(&ctxt, sizeof(ctxt)); 621 MD5Init(&ctxt); 622 MD5Update(&ctxt, &l, sizeof(l)); 623 MD5Update(&ctxt, n, l); 624 MD5Final(digest, &ctxt); 625 626 bzero(in6, sizeof(*in6)); 627 in6->s6_addr16[0] = htons(0xff02); 628 if (ifp) 629 in6->s6_addr16[1] = htons(ifp->if_index); 630 in6->s6_addr8[11] = 2; 631 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 632 633 return 0; 634 } 635 636 struct netmsg_nigroup { 637 struct netmsg_base nmsg; 638 const char *name; 639 int namelen; 640 }; 641 642 static void 643 in6_nigroup_attach_dispatch(netmsg_t msg) 644 { 645 struct netmsg_nigroup *nmsg = (struct netmsg_nigroup *)msg; 646 struct sockaddr_in6 mltaddr; 647 struct in6_multi *in6m; 648 const struct ifnet_array *arr; 649 int error, i; 650 651 bzero(&mltaddr, sizeof(mltaddr)); 652 mltaddr.sin6_family = AF_INET6; 653 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 654 if (in6_nigroup(NULL, nmsg->name, nmsg->namelen, 655 &mltaddr.sin6_addr) != 0) 656 goto done; 657 658 arr = ifnet_array_get(); 659 for (i = 0; i < arr->ifnet_count; ++i) { 660 struct ifnet *ifp = arr->ifnet_arr[i]; 661 662 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 663 in6m = IN6_LOOKUP_MULTI(&mltaddr.sin6_addr, ifp); 664 if (!in6m) { 665 if (!in6_addmulti(&mltaddr.sin6_addr, ifp, &error)) { 666 nd6log((LOG_ERR, "%s: failed to join %s " 667 "(errno=%d)\n", if_name(ifp), 668 ip6_sprintf(&mltaddr.sin6_addr), 669 error)); 670 } 671 } 672 } 673 done: 674 lwkt_replymsg(&nmsg->nmsg.lmsg, 0); 675 } 676 677 void 678 in6_nigroup_attach(const char *name, int namelen) 679 { 680 struct netmsg_nigroup nmsg; 681 682 netmsg_init(&nmsg.nmsg, NULL, &curthread->td_msgport, 0, 683 in6_nigroup_attach_dispatch); 684 nmsg.name = name; 685 nmsg.namelen = namelen; 686 lwkt_domsg(netisr_cpuport(0), &nmsg.nmsg.lmsg, 0); 687 } 688 689 static void 690 in6_nigroup_detach_dispatch(netmsg_t msg) 691 { 692 struct netmsg_nigroup *nmsg = (struct netmsg_nigroup *)msg; 693 struct sockaddr_in6 mltaddr; 694 struct in6_multi *in6m; 695 const struct ifnet_array *arr; 696 int i; 697 698 bzero(&mltaddr, sizeof(mltaddr)); 699 mltaddr.sin6_family = AF_INET6; 700 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 701 if (in6_nigroup(NULL, nmsg->name, nmsg->namelen, 702 &mltaddr.sin6_addr) != 0) 703 goto done; 704 705 arr = ifnet_array_get(); 706 for (i = 0; i < arr->ifnet_count; ++i) { 707 struct ifnet *ifp = arr->ifnet_arr[i]; 708 709 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 710 in6m = IN6_LOOKUP_MULTI(&mltaddr.sin6_addr, ifp); 711 if (in6m) 712 in6_delmulti(in6m); 713 } 714 done: 715 lwkt_replymsg(&nmsg->nmsg.lmsg, 0); 716 } 717 718 void 719 in6_nigroup_detach(const char *name, int namelen) 720 { 721 struct netmsg_nigroup nmsg; 722 723 netmsg_init(&nmsg.nmsg, NULL, &curthread->td_msgport, 0, 724 in6_nigroup_detach_dispatch); 725 nmsg.name = name; 726 nmsg.namelen = namelen; 727 lwkt_domsg(netisr_cpuport(0), &nmsg.nmsg.lmsg, 0); 728 } 729 730 /* 731 * XXX multiple loopback interface needs more care. for instance, 732 * nodelocal address needs to be configured onto only one of them. 733 * XXX multiple link-local address case 734 */ 735 void 736 in6_ifattach(struct ifnet *ifp, 737 struct ifnet *altifp) /* secondary EUI64 source */ 738 { 739 struct in6_ifaddr *ia; 740 struct in6_addr in6; 741 742 /* some of the interfaces are inherently not IPv6 capable */ 743 switch (ifp->if_type) { 744 #ifdef IFT_BRIDGE /* OpenBSD 2.8, NetBSD 1.6 */ 745 case IFT_BRIDGE: 746 return; 747 #endif 748 case IFT_PFLOG: 749 case IFT_PFSYNC: 750 case IFT_CARP: 751 return; 752 } 753 754 /* 755 * quirks based on interface type 756 */ 757 switch (ifp->if_type) { 758 #ifdef IFT_STF 759 case IFT_STF: 760 /* 761 * 6to4 interface is a very special kind of beast. 762 * no multicast, no linklocal. RFC2529 specifies how to make 763 * linklocals for 6to4 interface, but there's no use and 764 * it is rather harmful to have one. 765 */ 766 goto statinit; 767 #endif 768 default: 769 break; 770 } 771 772 /* 773 * usually, we require multicast capability to the interface 774 */ 775 if (!(ifp->if_flags & IFF_MULTICAST)) { 776 log(LOG_INFO, "in6_ifattach: " 777 "%s is not multicast capable, IPv6 not enabled\n", 778 if_name(ifp)); 779 return; 780 } 781 782 /* 783 * assign loopback address for loopback interface. 784 * XXX multiple loopback interface case. 785 */ 786 if (ifp->if_flags & IFF_LOOPBACK) { 787 in6 = kin6addr_loopback; 788 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 789 if (in6_ifattach_loopback(ifp) != 0) 790 return; 791 } 792 } 793 794 /* 795 * assign a link-local address, if there's none. 796 */ 797 if (ip6_auto_linklocal) { 798 ia = in6ifa_ifpforlinklocal(ifp, 0); 799 if (ia == NULL) { 800 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 801 /* linklocal address assigned */ 802 } else { 803 /* failed to assign linklocal address. bark? */ 804 } 805 } 806 } 807 808 #ifdef IFT_STF /* XXX */ 809 statinit: 810 #endif 811 812 /* update dynamically. */ 813 if (in6_maxmtu < ifp->if_mtu) 814 in6_maxmtu = ifp->if_mtu; 815 } 816 817 /* 818 * NOTE: in6_ifdetach() does not support loopback if at this moment. 819 */ 820 static void 821 in6_ifdetach_dispatch(netmsg_t nmsg) 822 { 823 struct lwkt_msg *lmsg = &nmsg->lmsg; 824 struct ifnet *ifp = lmsg->u.ms_resultp; 825 struct ifaddr_container *ifac, *next; 826 struct rtentry *rt; 827 struct sockaddr_in6 sin6; 828 struct in6_multi *in6m, *in6m_next; 829 830 ASSERT_NETISR0; 831 832 /* remove neighbor management table */ 833 nd6_purge(ifp); 834 835 /* nuke any of IPv6 addresses we have */ 836 TAILQ_FOREACH_MUTABLE(ifac, &ifp->if_addrheads[mycpuid], ifa_link, 837 next) { 838 struct ifaddr *ifa = ifac->ifa; 839 840 if (ifa->ifa_addr->sa_family != AF_INET6) 841 continue; 842 in6_purgeaddr(ifa); 843 } 844 845 /* 846 * XXX 847 * These were code trying to nuke inet6 addresses again, but all 848 * inet6 addresses must have been deleted above; use assertion. 849 */ 850 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 851 KASSERT(ifac->ifa->ifa_addr->sa_family != AF_INET6, 852 ("still has inet6 addr")); 853 } 854 855 /* leave from all multicast groups joined */ 856 in6_pcbpurgeif0(&ripcbinfo, ifp); 857 in6_pcbpurgeif0(&udbinfo[0], ifp); 858 for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) { 859 in6m_next = LIST_NEXT(in6m, in6m_entry); 860 if (in6m->in6m_ifp != ifp) 861 continue; 862 in6_delmulti(in6m); 863 in6m = NULL; 864 } 865 866 /* 867 * remove neighbor management table. we call it twice just to make 868 * sure we nuke everything. maybe we need just one call. 869 * XXX: since the first call did not release addresses, some prefixes 870 * might remain. We should call nd6_purge() again to release the 871 * prefixes after removing all addresses above. 872 * (Or can we just delay calling nd6_purge until at this point?) 873 */ 874 nd6_purge(ifp); 875 876 /* remove route to link-local allnodes multicast (ff02::1) */ 877 bzero(&sin6, sizeof(sin6)); 878 sin6.sin6_len = sizeof(struct sockaddr_in6); 879 sin6.sin6_family = AF_INET6; 880 sin6.sin6_addr = kin6addr_linklocal_allnodes; 881 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 882 rt = rtpurelookup((struct sockaddr *)&sin6); 883 if (rt != NULL && rt->rt_ifp == ifp) { 884 --rt->rt_refcnt; 885 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), 886 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 887 } 888 889 lwkt_replymsg(lmsg, 0); 890 } 891 892 void 893 in6_ifdetach(struct ifnet *ifp) 894 { 895 struct netmsg_base nmsg; 896 struct lwkt_msg *lmsg = &nmsg.lmsg; 897 898 netmsg_init(&nmsg, NULL, &curthread->td_msgport, 0, 899 in6_ifdetach_dispatch); 900 lmsg->u.ms_resultp = ifp; 901 lwkt_domsg(netisr_cpuport(0), lmsg, 0); 902 } 903 904 void 905 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, const u_int8_t *baseid, 906 int generate) 907 { 908 u_int8_t nullbuf[8]; 909 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 910 911 bzero(nullbuf, sizeof(nullbuf)); 912 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 913 /* we've never created a random ID. Create a new one. */ 914 generate = 1; 915 } 916 917 if (generate) { 918 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 919 920 /* generate_tmp_ifid will update seedn and buf */ 921 generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 922 ndi->randomid); 923 } 924 bcopy(ndi->randomid, retbuf, 8); 925 } 926 927 static void 928 in6_tmpaddrtimer(void *arg __unused) 929 { 930 struct lwkt_msg *lmsg = &in6_tmpaddrtimer_netmsg.lmsg; 931 932 KASSERT(mycpuid == 0, ("not on cpu0")); 933 crit_enter(); 934 if (lmsg->ms_flags & MSGF_DONE) 935 lwkt_sendmsg_oncpu(netisr_cpuport(0), lmsg); 936 crit_exit(); 937 } 938 939 static void 940 in6_tmpaddrtimer_dispatch(netmsg_t nmsg) 941 { 942 const struct ifnet_array *arr; 943 struct nd_ifinfo *ndi; 944 u_int8_t nullbuf[8]; 945 int i; 946 947 ASSERT_NETISR0; 948 949 crit_enter(); 950 lwkt_replymsg(&nmsg->lmsg, 0); /* reply ASAP */ 951 crit_exit(); 952 953 bzero(nullbuf, sizeof(nullbuf)); 954 arr = ifnet_array_get(); 955 for (i = 0; i < arr->ifnet_count; ++i) { 956 struct ifnet *ifp = arr->ifnet_arr[i]; 957 958 if (ifp->if_afdata[AF_INET6] == NULL) 959 continue; 960 ndi = ND_IFINFO(ifp); 961 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 962 /* 963 * We've been generating a random ID on this interface. 964 * Create a new one. 965 */ 966 generate_tmp_ifid(ndi->randomseed0, 967 ndi->randomseed1, 968 ndi->randomid); 969 } 970 } 971 972 callout_reset(&in6_tmpaddrtimer_ch, 973 (ip6_temp_preferred_lifetime - ip6_desync_factor - 974 ip6_temp_regen_advance) * hz, 975 in6_tmpaddrtimer, NULL); 976 } 977 978 /* 979 * Timer for regeneranation of temporary addresses randomize ID 980 */ 981 void 982 in6_tmpaddrtimer_init(void) 983 { 984 callout_init_mp(&in6_tmpaddrtimer_ch); 985 netmsg_init(&in6_tmpaddrtimer_netmsg, NULL, &netisr_adone_rport, 986 MSGF_PRIORITY, in6_tmpaddrtimer_dispatch); 987 callout_reset_bycpu(&in6_tmpaddrtimer_ch, 988 (ip6_temp_preferred_lifetime - ip6_desync_factor - 989 ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL, 0); 990 } 991