in6_ifattach.c revision 189851
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: head/sys/netinet6/in6_ifattach.c 189851 2009-03-15 14:21:05Z rwatson $"); 34 35#include "opt_route.h" 36 37#include <sys/param.h> 38#include <sys/systm.h> 39#include <sys/malloc.h> 40#include <sys/socket.h> 41#include <sys/sockio.h> 42#include <sys/kernel.h> 43#include <sys/syslog.h> 44#include <sys/md5.h> 45#include <sys/vimage.h> 46 47#include <net/if.h> 48#include <net/if_dl.h> 49#include <net/if_types.h> 50#include <net/route.h> 51#include <net/vnet.h> 52 53#include <netinet/in.h> 54#include <netinet/in_var.h> 55#include <netinet/if_ether.h> 56#include <netinet/in_pcb.h> 57#include <netinet/vinet.h> 58 59#include <netinet/ip6.h> 60#include <netinet6/ip6_var.h> 61#include <netinet6/in6_var.h> 62#include <netinet6/in6_pcb.h> 63#include <netinet6/in6_ifattach.h> 64#include <netinet6/ip6_var.h> 65#include <netinet6/nd6.h> 66#include <netinet6/scope6_var.h> 67#include <netinet6/vinet6.h> 68 69#ifdef VIMAGE_GLOBALS 70unsigned long in6_maxmtu; 71int ip6_auto_linklocal; 72struct callout in6_tmpaddrtimer_ch; 73extern struct inpcbinfo ripcbinfo; 74#endif 75 76static int get_rand_ifid(struct ifnet *, struct in6_addr *); 77static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 78static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 79static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 80static int in6_ifattach_loopback(struct ifnet *); 81static 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 */ 103static int 104get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 105{ 106 INIT_VPROCG(TD_TO_VPROCG(curthread)); /* XXX V_hostname needs this */ 107 MD5_CTX ctxt; 108 u_int8_t digest[16]; 109 int hostnamelen; 110 111 mtx_lock(&hostname_mtx); 112 hostnamelen = strlen(V_hostname); 113#if 0 114 /* we need at least several letters as seed for ifid */ 115 if (hostnamelen < 3) 116 return -1; 117#endif 118 119 /* generate 8 bytes of pseudo-random value. */ 120 bzero(&ctxt, sizeof(ctxt)); 121 MD5Init(&ctxt); 122 MD5Update(&ctxt, V_hostname, hostnamelen); 123 mtx_unlock(&hostname_mtx); 124 MD5Final(digest, &ctxt); 125 126 /* assumes sizeof(digest) > sizeof(ifid) */ 127 bcopy(digest, &in6->s6_addr[8], 8); 128 129 /* make sure to set "u" bit to local, and "g" bit to individual. */ 130 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 131 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 132 133 /* convert EUI64 into IPv6 interface identifier */ 134 EUI64_TO_IFID(in6); 135 136 return 0; 137} 138 139static int 140generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 141{ 142 INIT_VNET_INET6(curvnet); 143 MD5_CTX ctxt; 144 u_int8_t seed[16], digest[16], nullbuf[8]; 145 u_int32_t val32; 146 147 /* If there's no history, start with a random seed. */ 148 bzero(nullbuf, sizeof(nullbuf)); 149 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 150 int i; 151 152 for (i = 0; i < 2; i++) { 153 val32 = arc4random(); 154 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 155 } 156 } else 157 bcopy(seed0, seed, 8); 158 159 /* copy the right-most 64-bits of the given address */ 160 /* XXX assumption on the size of IFID */ 161 bcopy(seed1, &seed[8], 8); 162 163 if (0) { /* for debugging purposes only */ 164 int i; 165 166 printf("generate_tmp_ifid: new randomized ID from: "); 167 for (i = 0; i < 16; i++) 168 printf("%02x", seed[i]); 169 printf(" "); 170 } 171 172 /* generate 16 bytes of pseudo-random value. */ 173 bzero(&ctxt, sizeof(ctxt)); 174 MD5Init(&ctxt); 175 MD5Update(&ctxt, seed, sizeof(seed)); 176 MD5Final(digest, &ctxt); 177 178 /* 179 * RFC 3041 3.2.1. (3) 180 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 181 * left-most bit is numbered 0) to zero. 182 */ 183 bcopy(digest, ret, 8); 184 ret[0] &= ~EUI64_UBIT; 185 186 /* 187 * XXX: we'd like to ensure that the generated value is not zero 188 * for simplicity. If the caclculated digest happens to be zero, 189 * use a random non-zero value as the last resort. 190 */ 191 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 192 nd6log((LOG_INFO, 193 "generate_tmp_ifid: computed MD5 value is zero.\n")); 194 195 val32 = arc4random(); 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 printf("to: "); 211 for (i = 0; i < 16; i++) 212 printf("%02x", digest[i]); 213 printf("\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 * in6 - upper 64bits are preserved 224 */ 225int 226in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 227{ 228 struct ifaddr *ifa; 229 struct sockaddr_dl *sdl; 230 u_int8_t *addr; 231 size_t addrlen; 232 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 233 static u_int8_t allone[8] = 234 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 235 236 for (ifa = ifp->if_addrlist.tqh_first; 237 ifa; 238 ifa = ifa->ifa_list.tqe_next) { 239 if (ifa->ifa_addr->sa_family != AF_LINK) 240 continue; 241 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 242 if (sdl == NULL) 243 continue; 244 if (sdl->sdl_alen == 0) 245 continue; 246 247 goto found; 248 } 249 250 return -1; 251 252found: 253 addr = LLADDR(sdl); 254 addrlen = sdl->sdl_alen; 255 256 /* get EUI64 */ 257 switch (ifp->if_type) { 258 case IFT_ETHER: 259 case IFT_FDDI: 260 case IFT_ISO88025: 261 case IFT_ATM: 262 case IFT_IEEE1394: 263#ifdef IFT_IEEE80211 264 case IFT_IEEE80211: 265#endif 266 /* IEEE802/EUI64 cases - what others? */ 267 /* IEEE1394 uses 16byte length address starting with EUI64 */ 268 if (addrlen > 8) 269 addrlen = 8; 270 271 /* look at IEEE802/EUI64 only */ 272 if (addrlen != 8 && addrlen != 6) 273 return -1; 274 275 /* 276 * check for invalid MAC address - on bsdi, we see it a lot 277 * since wildboar configures all-zero MAC on pccard before 278 * card insertion. 279 */ 280 if (bcmp(addr, allzero, addrlen) == 0) 281 return -1; 282 if (bcmp(addr, allone, addrlen) == 0) 283 return -1; 284 285 /* make EUI64 address */ 286 if (addrlen == 8) 287 bcopy(addr, &in6->s6_addr[8], 8); 288 else if (addrlen == 6) { 289 in6->s6_addr[8] = addr[0]; 290 in6->s6_addr[9] = addr[1]; 291 in6->s6_addr[10] = addr[2]; 292 in6->s6_addr[11] = 0xff; 293 in6->s6_addr[12] = 0xfe; 294 in6->s6_addr[13] = addr[3]; 295 in6->s6_addr[14] = addr[4]; 296 in6->s6_addr[15] = addr[5]; 297 } 298 break; 299 300 case IFT_ARCNET: 301 if (addrlen != 1) 302 return -1; 303 if (!addr[0]) 304 return -1; 305 306 bzero(&in6->s6_addr[8], 8); 307 in6->s6_addr[15] = addr[0]; 308 309 /* 310 * due to insufficient bitwidth, we mark it local. 311 */ 312 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 313 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 314 break; 315 316 case IFT_GIF: 317#ifdef IFT_STF 318 case IFT_STF: 319#endif 320 /* 321 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 322 * however, IPv4 address is not very suitable as unique 323 * identifier source (can be renumbered). 324 * we don't do this. 325 */ 326 return -1; 327 328 default: 329 return -1; 330 } 331 332 /* sanity check: g bit must not indicate "group" */ 333 if (EUI64_GROUP(in6)) 334 return -1; 335 336 /* convert EUI64 into IPv6 interface identifier */ 337 EUI64_TO_IFID(in6); 338 339 /* 340 * sanity check: ifid must not be all zero, avoid conflict with 341 * subnet router anycast 342 */ 343 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 344 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 345 return -1; 346 } 347 348 return 0; 349} 350 351/* 352 * Get interface identifier for the specified interface. If it is not 353 * available on ifp0, borrow interface identifier from other information 354 * sources. 355 * 356 * altifp - secondary EUI64 source 357 */ 358static int 359get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 360 struct in6_addr *in6) 361{ 362 INIT_VNET_NET(ifp0->if_vnet); 363 INIT_VNET_INET6(ifp0->if_vnet); 364 struct ifnet *ifp; 365 366 /* first, try to get it from the interface itself */ 367 if (in6_get_hw_ifid(ifp0, in6) == 0) { 368 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 369 if_name(ifp0))); 370 goto success; 371 } 372 373 /* try secondary EUI64 source. this basically is for ATM PVC */ 374 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 375 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 376 if_name(ifp0), if_name(altifp))); 377 goto success; 378 } 379 380 /* next, try to get it from some other hardware interface */ 381 IFNET_RLOCK(); 382 for (ifp = V_ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) { 383 if (ifp == ifp0) 384 continue; 385 if (in6_get_hw_ifid(ifp, in6) != 0) 386 continue; 387 388 /* 389 * to borrow ifid from other interface, ifid needs to be 390 * globally unique 391 */ 392 if (IFID_UNIVERSAL(in6)) { 393 nd6log((LOG_DEBUG, 394 "%s: borrow interface identifier from %s\n", 395 if_name(ifp0), if_name(ifp))); 396 IFNET_RUNLOCK(); 397 goto success; 398 } 399 } 400 IFNET_RUNLOCK(); 401 402 /* last resort: get from random number source */ 403 if (get_rand_ifid(ifp, in6) == 0) { 404 nd6log((LOG_DEBUG, 405 "%s: interface identifier generated by random number\n", 406 if_name(ifp0))); 407 goto success; 408 } 409 410 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 411 return -1; 412 413success: 414 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 415 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 416 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 417 in6->s6_addr[14], in6->s6_addr[15])); 418 return 0; 419} 420 421/* 422 * altifp - secondary EUI64 source 423 */ 424static int 425in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 426{ 427 INIT_VNET_INET6(curvnet); 428 struct in6_ifaddr *ia; 429 struct in6_aliasreq ifra; 430 struct nd_prefixctl pr0; 431 int i, error; 432 433 /* 434 * configure link-local address. 435 */ 436 bzero(&ifra, sizeof(ifra)); 437 438 /* 439 * in6_update_ifa() does not use ifra_name, but we accurately set it 440 * for safety. 441 */ 442 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 443 444 ifra.ifra_addr.sin6_family = AF_INET6; 445 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 446 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 447 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 448 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 449 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 450 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 451 } else { 452 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 453 nd6log((LOG_ERR, 454 "%s: no ifid available\n", if_name(ifp))); 455 return (-1); 456 } 457 } 458 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 459 return (-1); 460 461 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 462 ifra.ifra_prefixmask.sin6_family = AF_INET6; 463 ifra.ifra_prefixmask.sin6_addr = in6mask64; 464 /* link-local addresses should NEVER expire. */ 465 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 466 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 467 468 /* 469 * Now call in6_update_ifa() to do a bunch of procedures to configure 470 * a link-local address. We can set the 3rd argument to NULL, because 471 * we know there's no other link-local address on the interface 472 * and therefore we are adding one (instead of updating one). 473 */ 474 if ((error = in6_update_ifa(ifp, &ifra, NULL, 475 IN6_IFAUPDATE_DADDELAY)) != 0) { 476 /* 477 * XXX: When the interface does not support IPv6, this call 478 * would fail in the SIOCSIFADDR ioctl. I believe the 479 * notification is rather confusing in this case, so just 480 * suppress it. (jinmei@kame.net 20010130) 481 */ 482 if (error != EAFNOSUPPORT) 483 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 484 "configure a link-local address on %s " 485 "(errno=%d)\n", 486 if_name(ifp), error)); 487 return (-1); 488 } 489 490 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 491#ifdef DIAGNOSTIC 492 if (!ia) { 493 panic("ia == NULL in in6_ifattach_linklocal"); 494 /* NOTREACHED */ 495 } 496#endif 497 498 /* 499 * Make the link-local prefix (fe80::%link/64) as on-link. 500 * Since we'd like to manage prefixes separately from addresses, 501 * we make an ND6 prefix structure for the link-local prefix, 502 * and add it to the prefix list as a never-expire prefix. 503 * XXX: this change might affect some existing code base... 504 */ 505 bzero(&pr0, sizeof(pr0)); 506 pr0.ndpr_ifp = ifp; 507 /* this should be 64 at this moment. */ 508 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 509 pr0.ndpr_prefix = ifra.ifra_addr; 510 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 511 for (i = 0; i < 4; i++) { 512 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 513 in6mask64.s6_addr32[i]; 514 } 515 /* 516 * Initialize parameters. The link-local prefix must always be 517 * on-link, and its lifetimes never expire. 518 */ 519 pr0.ndpr_raf_onlink = 1; 520 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 521 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 522 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 523 /* 524 * Since there is no other link-local addresses, nd6_prefix_lookup() 525 * probably returns NULL. However, we cannot always expect the result. 526 * For example, if we first remove the (only) existing link-local 527 * address, and then reconfigure another one, the prefix is still 528 * valid with referring to the old link-local address. 529 */ 530 if (nd6_prefix_lookup(&pr0) == NULL) { 531 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 532 return (error); 533 } 534 535 return 0; 536} 537 538/* 539 * ifp - must be IFT_LOOP 540 */ 541static int 542in6_ifattach_loopback(struct ifnet *ifp) 543{ 544 INIT_VNET_INET6(curvnet); 545 struct in6_aliasreq ifra; 546 int error; 547 548 bzero(&ifra, sizeof(ifra)); 549 550 /* 551 * in6_update_ifa() does not use ifra_name, but we accurately set it 552 * for safety. 553 */ 554 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 555 556 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 557 ifra.ifra_prefixmask.sin6_family = AF_INET6; 558 ifra.ifra_prefixmask.sin6_addr = in6mask128; 559 560 /* 561 * Always initialize ia_dstaddr (= broadcast address) to loopback 562 * address. Follows IPv4 practice - see in_ifinit(). 563 */ 564 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 565 ifra.ifra_dstaddr.sin6_family = AF_INET6; 566 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 567 568 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 569 ifra.ifra_addr.sin6_family = AF_INET6; 570 ifra.ifra_addr.sin6_addr = in6addr_loopback; 571 572 /* the loopback address should NEVER expire. */ 573 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 574 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 575 576 /* we don't need to perform DAD on loopback interfaces. */ 577 ifra.ifra_flags |= IN6_IFF_NODAD; 578 579 /* skip registration to the prefix list. XXX should be temporary. */ 580 ifra.ifra_flags |= IN6_IFF_NOPFX; 581 582 /* 583 * We are sure that this is a newly assigned address, so we can set 584 * NULL to the 3rd arg. 585 */ 586 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 587 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 588 "the loopback address on %s (errno=%d)\n", 589 if_name(ifp), error)); 590 return (-1); 591 } 592 593 return 0; 594} 595 596/* 597 * compute NI group address, based on the current hostname setting. 598 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 599 * 600 * when ifp == NULL, the caller is responsible for filling scopeid. 601 */ 602int 603in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 604 struct in6_addr *in6) 605{ 606 const char *p; 607 u_char *q; 608 MD5_CTX ctxt; 609 u_int8_t digest[16]; 610 char l; 611 char n[64]; /* a single label must not exceed 63 chars */ 612 613 if (!namelen || !name) 614 return -1; 615 616 p = name; 617 while (p && *p && *p != '.' && p - name < namelen) 618 p++; 619 if (p - name > sizeof(n) - 1) 620 return -1; /* label too long */ 621 l = p - name; 622 strncpy(n, name, l); 623 n[(int)l] = '\0'; 624 for (q = n; *q; q++) { 625 if ('A' <= *q && *q <= 'Z') 626 *q = *q - 'A' + 'a'; 627 } 628 629 /* generate 8 bytes of pseudo-random value. */ 630 bzero(&ctxt, sizeof(ctxt)); 631 MD5Init(&ctxt); 632 MD5Update(&ctxt, &l, sizeof(l)); 633 MD5Update(&ctxt, n, l); 634 MD5Final(digest, &ctxt); 635 636 bzero(in6, sizeof(*in6)); 637 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 638 in6->s6_addr8[11] = 2; 639 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 640 if (in6_setscope(in6, ifp, NULL)) 641 return (-1); /* XXX: should not fail */ 642 643 return 0; 644} 645 646/* 647 * XXX multiple loopback interface needs more care. for instance, 648 * nodelocal address needs to be configured onto only one of them. 649 * XXX multiple link-local address case 650 * 651 * altifp - secondary EUI64 source 652 */ 653void 654in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 655{ 656 INIT_VNET_INET6(ifp->if_vnet); 657 struct in6_ifaddr *ia; 658 struct in6_addr in6; 659 660 /* some of the interfaces are inherently not IPv6 capable */ 661 switch (ifp->if_type) { 662 case IFT_PFLOG: 663 case IFT_PFSYNC: 664 case IFT_CARP: 665 return; 666 } 667 668 /* 669 * quirks based on interface type 670 */ 671 switch (ifp->if_type) { 672#ifdef IFT_STF 673 case IFT_STF: 674 /* 675 * 6to4 interface is a very special kind of beast. 676 * no multicast, no linklocal. RFC2529 specifies how to make 677 * linklocals for 6to4 interface, but there's no use and 678 * it is rather harmful to have one. 679 */ 680 goto statinit; 681#endif 682 default: 683 break; 684 } 685 686 /* 687 * usually, we require multicast capability to the interface 688 */ 689 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 690 nd6log((LOG_INFO, "in6_ifattach: " 691 "%s is not multicast capable, IPv6 not enabled\n", 692 if_name(ifp))); 693 return; 694 } 695 696 /* 697 * assign loopback address for loopback interface. 698 * XXX multiple loopback interface case. 699 */ 700 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 701 in6 = in6addr_loopback; 702 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 703 if (in6_ifattach_loopback(ifp) != 0) 704 return; 705 } 706 } 707 708 /* 709 * assign a link-local address, if there's none. 710 */ 711 if (V_ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) { 712 ia = in6ifa_ifpforlinklocal(ifp, 0); 713 if (ia == NULL) { 714 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 715 /* linklocal address assigned */ 716 } else { 717 /* failed to assign linklocal address. bark? */ 718 } 719 } 720 } 721 722#ifdef IFT_STF /* XXX */ 723statinit: 724#endif 725 726 /* update dynamically. */ 727 if (V_in6_maxmtu < ifp->if_mtu) 728 V_in6_maxmtu = ifp->if_mtu; 729} 730 731/* 732 * NOTE: in6_ifdetach() does not support loopback if at this moment. 733 * We don't need this function in bsdi, because interfaces are never removed 734 * from the ifnet list in bsdi. 735 */ 736void 737in6_ifdetach(struct ifnet *ifp) 738{ 739 INIT_VNET_NET(ifp->if_vnet); 740 INIT_VNET_INET(ifp->if_vnet); 741 INIT_VNET_INET6(ifp->if_vnet); 742 struct in6_ifaddr *ia, *oia; 743 struct ifaddr *ifa, *next; 744 struct rtentry *rt; 745 short rtflags; 746 struct sockaddr_in6 sin6; 747 struct in6_multi_mship *imm; 748 749 /* remove neighbor management table */ 750 nd6_purge(ifp); 751 752 /* nuke any of IPv6 addresses we have */ 753 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) { 754 next = ifa->ifa_list.tqe_next; 755 if (ifa->ifa_addr->sa_family != AF_INET6) 756 continue; 757 in6_purgeaddr(ifa); 758 } 759 760 /* undo everything done by in6_ifattach(), just in case */ 761 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) { 762 next = ifa->ifa_list.tqe_next; 763 764 if (ifa->ifa_addr->sa_family != AF_INET6 765 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 766 continue; 767 } 768 769 ia = (struct in6_ifaddr *)ifa; 770 771 /* 772 * leave from multicast groups we have joined for the interface 773 */ 774 while ((imm = ia->ia6_memberships.lh_first) != NULL) { 775 LIST_REMOVE(imm, i6mm_chain); 776 in6_leavegroup(imm); 777 } 778 779 /* remove from the routing table */ 780 if ((ia->ia_flags & IFA_ROUTE) && 781 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 782 rtflags = rt->rt_flags; 783 RTFREE_LOCKED(rt); 784 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 785 (struct sockaddr *)&ia->ia_addr, 786 (struct sockaddr *)&ia->ia_prefixmask, 787 rtflags, (struct rtentry **)0); 788 } 789 790 /* remove from the linked list */ 791 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 792 IFAFREE(&ia->ia_ifa); 793 794 /* also remove from the IPv6 address chain(itojun&jinmei) */ 795 oia = ia; 796 if (oia == (ia = V_in6_ifaddr)) 797 V_in6_ifaddr = ia->ia_next; 798 else { 799 while (ia->ia_next && (ia->ia_next != oia)) 800 ia = ia->ia_next; 801 if (ia->ia_next) 802 ia->ia_next = oia->ia_next; 803 else { 804 nd6log((LOG_ERR, 805 "%s: didn't unlink in6ifaddr from list\n", 806 if_name(ifp))); 807 } 808 } 809 810 IFAFREE(&oia->ia_ifa); 811 } 812 813 in6_pcbpurgeif0(&V_udbinfo, ifp); 814 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 815 /* leave from all multicast groups joined */ 816 in6_purgemaddrs(ifp); 817 818 /* 819 * remove neighbor management table. we call it twice just to make 820 * sure we nuke everything. maybe we need just one call. 821 * XXX: since the first call did not release addresses, some prefixes 822 * might remain. We should call nd6_purge() again to release the 823 * prefixes after removing all addresses above. 824 * (Or can we just delay calling nd6_purge until at this point?) 825 */ 826 nd6_purge(ifp); 827 828 /* remove route to link-local allnodes multicast (ff02::1) */ 829 bzero(&sin6, sizeof(sin6)); 830 sin6.sin6_len = sizeof(struct sockaddr_in6); 831 sin6.sin6_family = AF_INET6; 832 sin6.sin6_addr = in6addr_linklocal_allnodes; 833 if (in6_setscope(&sin6.sin6_addr, ifp, NULL)) 834 /* XXX: should not fail */ 835 return; 836 /* XXX grab lock first to avoid LOR */ 837 if (V_rt_tables[0][AF_INET6] != NULL) { 838 RADIX_NODE_HEAD_LOCK(V_rt_tables[0][AF_INET6]); 839 rt = rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED); 840 if (rt) { 841 if (rt->rt_ifp == ifp) 842 rtexpunge(rt); 843 RTFREE_LOCKED(rt); 844 } 845 RADIX_NODE_HEAD_UNLOCK(V_rt_tables[0][AF_INET6]); 846 } 847} 848 849int 850in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 851 const u_int8_t *baseid, int generate) 852{ 853 u_int8_t nullbuf[8]; 854 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 855 856 bzero(nullbuf, sizeof(nullbuf)); 857 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 858 /* we've never created a random ID. Create a new one. */ 859 generate = 1; 860 } 861 862 if (generate) { 863 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 864 865 /* generate_tmp_ifid will update seedn and buf */ 866 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 867 ndi->randomid); 868 } 869 bcopy(ndi->randomid, retbuf, 8); 870 871 return (0); 872} 873 874void 875in6_tmpaddrtimer(void *ignored_arg) 876{ 877 INIT_VNET_NET(curvnet); 878 INIT_VNET_INET6(curvnet); 879 struct nd_ifinfo *ndi; 880 u_int8_t nullbuf[8]; 881 struct ifnet *ifp; 882 883 callout_reset(&V_in6_tmpaddrtimer_ch, 884 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 885 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL); 886 887 bzero(nullbuf, sizeof(nullbuf)); 888 for (ifp = TAILQ_FIRST(&V_ifnet); ifp; 889 ifp = TAILQ_NEXT(ifp, if_list)) { 890 ndi = ND_IFINFO(ifp); 891 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 892 /* 893 * We've been generating a random ID on this interface. 894 * Create a new one. 895 */ 896 (void)generate_tmp_ifid(ndi->randomseed0, 897 ndi->randomseed1, ndi->randomid); 898 } 899 } 900 901} 902 903static void 904in6_purgemaddrs(struct ifnet *ifp) 905{ 906 struct in6_multi *in6m; 907 struct in6_multi *oin6m; 908 909 LIST_FOREACH_SAFE(in6m, &in6_multihead, in6m_entry, oin6m) { 910 if (in6m->in6m_ifp == ifp) 911 in6_delmulti(in6m); 912 } 913} 914