in6_ifattach.c revision 181887
1238438Sdteske/*- 2238438Sdteske * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3238438Sdteske * All rights reserved. 4249746Sdteske * 5238438Sdteske * Redistribution and use in source and binary forms, with or without 6238438Sdteske * modification, are permitted provided that the following conditions 7238438Sdteske * are met: 8238438Sdteske * 1. Redistributions of source code must retain the above copyright 9238438Sdteske * notice, this list of conditions and the following disclaimer. 10238438Sdteske * 2. Redistributions in binary form must reproduce the above copyright 11238438Sdteske * notice, this list of conditions and the following disclaimer in the 12238438Sdteske * documentation and/or other materials provided with the distribution. 13238438Sdteske * 3. Neither the name of the project nor the names of its contributors 14238438Sdteske * may be used to endorse or promote products derived from this software 15238438Sdteske * without specific prior written permission. 16238438Sdteske * 17238438Sdteske * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18238438Sdteske * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19238438Sdteske * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20238438Sdteske * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21238438Sdteske * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22238438Sdteske * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23238438Sdteske * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24238438Sdteske * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25238438Sdteske * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26238438Sdteske * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27238438Sdteske * SUCH DAMAGE. 28238438Sdteske * 29238438Sdteske * $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $ 30238438Sdteske */ 31238438Sdteske 32240684Sdteske#include <sys/cdefs.h> 33240684Sdteske__FBSDID("$FreeBSD: head/sys/netinet6/in6_ifattach.c 181887 2008-08-20 01:05:56Z julian $"); 34244675Sdteske 35240684Sdteske#include <sys/param.h> 36240684Sdteske#include <sys/systm.h> 37240684Sdteske#include <sys/malloc.h> 38238438Sdteske#include <sys/socket.h> 39240684Sdteske#include <sys/sockio.h> 40238438Sdteske#include <sys/kernel.h> 41238438Sdteske#include <sys/syslog.h> 42259054Sdteske#include <sys/md5.h> 43259054Sdteske#include <sys/vimage.h> 44238438Sdteske 45238438Sdteske#include <net/if.h> 46238438Sdteske#include <net/if_dl.h> 47238438Sdteske#include <net/if_types.h> 48238438Sdteske#include <net/route.h> 49238438Sdteske 50238438Sdteske#include <netinet/in.h> 51238438Sdteske#include <netinet/in_var.h> 52238438Sdteske#include <netinet/if_ether.h> 53250633Sdteske#include <netinet/in_pcb.h> 54238438Sdteske 55252178Sdteske#include <netinet/ip6.h> 56238438Sdteske#include <netinet6/ip6_var.h> 57238438Sdteske#include <netinet6/in6_var.h> 58238438Sdteske#include <netinet6/in6_pcb.h> 59238438Sdteske#include <netinet6/in6_ifattach.h> 60238438Sdteske#include <netinet6/ip6_var.h> 61238438Sdteske#include <netinet6/nd6.h> 62238438Sdteske#include <netinet6/scope6_var.h> 63238438Sdteske 64238438Sdteskeunsigned long in6_maxmtu = 0; 65238438Sdteske 66238438Sdteske#ifdef IP6_AUTO_LINKLOCAL 67238438Sdteskeint ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; 68238438Sdteske#else 69238438Sdteskeint ip6_auto_linklocal = 1; /* enable by default */ 70249751Sdteske#endif 71238438Sdteske 72249751Sdteskestruct callout in6_tmpaddrtimer_ch; 73238438Sdteske 74251236Sdteskeextern struct inpcbinfo udbinfo; 75244550Sdteskeextern struct inpcbinfo ripcbinfo; 76249751Sdteske 77238438Sdteskestatic int get_rand_ifid(struct ifnet *, struct in6_addr *); 78256181Sdteskestatic int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 79238438Sdteskestatic int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 80252019Sdteskestatic int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 81252019Sdteskestatic int in6_ifattach_loopback(struct ifnet *); 82252019Sdteskestatic void in6_purgemaddrs(struct ifnet *); 83252019Sdteske 84252019Sdteske#define EUI64_GBIT 0x01 85252019Sdteske#define EUI64_UBIT 0x02 86238438Sdteske#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 87238438Sdteske#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 88238438Sdteske#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 89238438Sdteske#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 90238438Sdteske#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 91238438Sdteske 92238438Sdteske#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 * in6 - upper 64bits are preserved 103 */ 104static int 105get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 106{ 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 MD5_CTX ctxt; 143 u_int8_t seed[16], digest[16], nullbuf[8]; 144 u_int32_t val32; 145 146 /* If there's no history, start with a random seed. */ 147 bzero(nullbuf, sizeof(nullbuf)); 148 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 149 int i; 150 151 for (i = 0; i < 2; i++) { 152 val32 = arc4random(); 153 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 154 } 155 } else 156 bcopy(seed0, seed, 8); 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 printf("generate_tmp_ifid: new randomized ID from: "); 166 for (i = 0; i < 16; i++) 167 printf("%02x", seed[i]); 168 printf(" "); 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 nd6log((LOG_INFO, 192 "generate_tmp_ifid: computed MD5 value is zero.\n")); 193 194 val32 = arc4random(); 195 val32 = 1 + (val32 % (0xffffffff - 1)); 196 } 197 198 /* 199 * RFC 3041 3.2.1. (4) 200 * Take the rightmost 64-bits of the MD5 digest and save them in 201 * stable storage as the history value to be used in the next 202 * iteration of the algorithm. 203 */ 204 bcopy(&digest[8], seed0, 8); 205 206 if (0) { /* for debugging purposes only */ 207 int i; 208 209 printf("to: "); 210 for (i = 0; i < 16; i++) 211 printf("%02x", digest[i]); 212 printf("\n"); 213 } 214 215 return 0; 216} 217 218/* 219 * Get interface identifier for the specified interface. 220 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 221 * 222 * in6 - upper 64bits are preserved 223 */ 224int 225in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 226{ 227 struct ifaddr *ifa; 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 for (ifa = ifp->if_addrlist.tqh_first; 236 ifa; 237 ifa = ifa->ifa_list.tqe_next) { 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 251found: 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_FDDI: 259 case IFT_ISO88025: 260 case IFT_ATM: 261 case IFT_IEEE1394: 262#ifdef IFT_IEEE80211 263 case IFT_IEEE80211: 264#endif 265 /* IEEE802/EUI64 cases - what others? */ 266 /* IEEE1394 uses 16byte length address starting with EUI64 */ 267 if (addrlen > 8) 268 addrlen = 8; 269 270 /* look at IEEE802/EUI64 only */ 271 if (addrlen != 8 && addrlen != 6) 272 return -1; 273 274 /* 275 * check for invalid MAC address - on bsdi, we see it a lot 276 * since wildboar configures all-zero MAC on pccard before 277 * card insertion. 278 */ 279 if (bcmp(addr, allzero, addrlen) == 0) 280 return -1; 281 if (bcmp(addr, allone, addrlen) == 0) 282 return -1; 283 284 /* make EUI64 address */ 285 if (addrlen == 8) 286 bcopy(addr, &in6->s6_addr[8], 8); 287 else if (addrlen == 6) { 288 in6->s6_addr[8] = addr[0]; 289 in6->s6_addr[9] = addr[1]; 290 in6->s6_addr[10] = addr[2]; 291 in6->s6_addr[11] = 0xff; 292 in6->s6_addr[12] = 0xfe; 293 in6->s6_addr[13] = addr[3]; 294 in6->s6_addr[14] = addr[4]; 295 in6->s6_addr[15] = addr[5]; 296 } 297 break; 298 299 case IFT_ARCNET: 300 if (addrlen != 1) 301 return -1; 302 if (!addr[0]) 303 return -1; 304 305 bzero(&in6->s6_addr[8], 8); 306 in6->s6_addr[15] = addr[0]; 307 308 /* 309 * due to insufficient bitwidth, we mark it local. 310 */ 311 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 312 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 313 break; 314 315 case IFT_GIF: 316#ifdef IFT_STF 317 case IFT_STF: 318#endif 319 /* 320 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 321 * however, IPv4 address is not very suitable as unique 322 * identifier source (can be renumbered). 323 * we don't do this. 324 */ 325 return -1; 326 327 default: 328 return -1; 329 } 330 331 /* sanity check: g bit must not indicate "group" */ 332 if (EUI64_GROUP(in6)) 333 return -1; 334 335 /* convert EUI64 into IPv6 interface identifier */ 336 EUI64_TO_IFID(in6); 337 338 /* 339 * sanity check: ifid must not be all zero, avoid conflict with 340 * subnet router anycast 341 */ 342 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 343 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 344 return -1; 345 } 346 347 return 0; 348} 349 350/* 351 * Get interface identifier for the specified interface. If it is not 352 * available on ifp0, borrow interface identifier from other information 353 * sources. 354 * 355 * altifp - secondary EUI64 source 356 */ 357static int 358get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 359 struct in6_addr *in6) 360{ 361 struct ifnet *ifp; 362 363 /* first, try to get it from the interface itself */ 364 if (in6_get_hw_ifid(ifp0, in6) == 0) { 365 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 366 if_name(ifp0))); 367 goto success; 368 } 369 370 /* try secondary EUI64 source. this basically is for ATM PVC */ 371 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 372 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 373 if_name(ifp0), if_name(altifp))); 374 goto success; 375 } 376 377 /* next, try to get it from some other hardware interface */ 378 IFNET_RLOCK(); 379 for (ifp = V_ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) { 380 if (ifp == ifp0) 381 continue; 382 if (in6_get_hw_ifid(ifp, in6) != 0) 383 continue; 384 385 /* 386 * to borrow ifid from other interface, ifid needs to be 387 * globally unique 388 */ 389 if (IFID_UNIVERSAL(in6)) { 390 nd6log((LOG_DEBUG, 391 "%s: borrow interface identifier from %s\n", 392 if_name(ifp0), if_name(ifp))); 393 IFNET_RUNLOCK(); 394 goto success; 395 } 396 } 397 IFNET_RUNLOCK(); 398 399 /* last resort: get from random number source */ 400 if (get_rand_ifid(ifp, in6) == 0) { 401 nd6log((LOG_DEBUG, 402 "%s: interface identifier generated by random number\n", 403 if_name(ifp0))); 404 goto success; 405 } 406 407 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 408 return -1; 409 410success: 411 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 412 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 413 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 414 in6->s6_addr[14], in6->s6_addr[15])); 415 return 0; 416} 417 418/* 419 * altifp - secondary EUI64 source 420 */ 421static int 422in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 423{ 424 struct in6_ifaddr *ia; 425 struct in6_aliasreq ifra; 426 struct nd_prefixctl pr0; 427 int i, error; 428 429 /* 430 * configure link-local address. 431 */ 432 bzero(&ifra, sizeof(ifra)); 433 434 /* 435 * in6_update_ifa() does not use ifra_name, but we accurately set it 436 * for safety. 437 */ 438 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 439 440 ifra.ifra_addr.sin6_family = AF_INET6; 441 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 442 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 443 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 444 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 445 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 446 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 447 } else { 448 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 449 nd6log((LOG_ERR, 450 "%s: no ifid available\n", if_name(ifp))); 451 return (-1); 452 } 453 } 454 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 455 return (-1); 456 457 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 458 ifra.ifra_prefixmask.sin6_family = AF_INET6; 459 ifra.ifra_prefixmask.sin6_addr = in6mask64; 460 /* link-local addresses should NEVER expire. */ 461 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 462 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 463 464 /* 465 * Now call in6_update_ifa() to do a bunch of procedures to configure 466 * a link-local address. We can set the 3rd argument to NULL, because 467 * we know there's no other link-local address on the interface 468 * and therefore we are adding one (instead of updating one). 469 */ 470 if ((error = in6_update_ifa(ifp, &ifra, NULL, 471 IN6_IFAUPDATE_DADDELAY)) != 0) { 472 /* 473 * XXX: When the interface does not support IPv6, this call 474 * would fail in the SIOCSIFADDR ioctl. I believe the 475 * notification is rather confusing in this case, so just 476 * suppress it. (jinmei@kame.net 20010130) 477 */ 478 if (error != EAFNOSUPPORT) 479 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 480 "configure a link-local address on %s " 481 "(errno=%d)\n", 482 if_name(ifp), error)); 483 return (-1); 484 } 485 486 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 487#ifdef DIAGNOSTIC 488 if (!ia) { 489 panic("ia == NULL in in6_ifattach_linklocal"); 490 /* NOTREACHED */ 491 } 492#endif 493 494 /* 495 * Make the link-local prefix (fe80::%link/64) as on-link. 496 * Since we'd like to manage prefixes separately from addresses, 497 * we make an ND6 prefix structure for the link-local prefix, 498 * and add it to the prefix list as a never-expire prefix. 499 * XXX: this change might affect some existing code base... 500 */ 501 bzero(&pr0, sizeof(pr0)); 502 pr0.ndpr_ifp = ifp; 503 /* this should be 64 at this moment. */ 504 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 505 pr0.ndpr_prefix = ifra.ifra_addr; 506 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 507 for (i = 0; i < 4; i++) { 508 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 509 in6mask64.s6_addr32[i]; 510 } 511 /* 512 * Initialize parameters. The link-local prefix must always be 513 * on-link, and its lifetimes never expire. 514 */ 515 pr0.ndpr_raf_onlink = 1; 516 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 517 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 518 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 519 /* 520 * Since there is no other link-local addresses, nd6_prefix_lookup() 521 * probably returns NULL. However, we cannot always expect the result. 522 * For example, if we first remove the (only) existing link-local 523 * address, and then reconfigure another one, the prefix is still 524 * valid with referring to the old link-local address. 525 */ 526 if (nd6_prefix_lookup(&pr0) == NULL) { 527 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 528 return (error); 529 } 530 531 return 0; 532} 533 534/* 535 * ifp - must be IFT_LOOP 536 */ 537static int 538in6_ifattach_loopback(struct ifnet *ifp) 539{ 540 struct in6_aliasreq ifra; 541 int error; 542 543 bzero(&ifra, sizeof(ifra)); 544 545 /* 546 * in6_update_ifa() does not use ifra_name, but we accurately set it 547 * for safety. 548 */ 549 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 550 551 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 552 ifra.ifra_prefixmask.sin6_family = AF_INET6; 553 ifra.ifra_prefixmask.sin6_addr = in6mask128; 554 555 /* 556 * Always initialize ia_dstaddr (= broadcast address) to loopback 557 * address. Follows IPv4 practice - see in_ifinit(). 558 */ 559 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 560 ifra.ifra_dstaddr.sin6_family = AF_INET6; 561 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 562 563 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 564 ifra.ifra_addr.sin6_family = AF_INET6; 565 ifra.ifra_addr.sin6_addr = in6addr_loopback; 566 567 /* the loopback address should NEVER expire. */ 568 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 569 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 570 571 /* we don't need to perform DAD on loopback interfaces. */ 572 ifra.ifra_flags |= IN6_IFF_NODAD; 573 574 /* skip registration to the prefix list. XXX should be temporary. */ 575 ifra.ifra_flags |= IN6_IFF_NOPFX; 576 577 /* 578 * We are sure that this is a newly assigned address, so we can set 579 * NULL to the 3rd arg. 580 */ 581 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 582 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 583 "the loopback address on %s (errno=%d)\n", 584 if_name(ifp), error)); 585 return (-1); 586 } 587 588 return 0; 589} 590 591/* 592 * compute NI group address, based on the current hostname setting. 593 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 594 * 595 * when ifp == NULL, the caller is responsible for filling scopeid. 596 */ 597int 598in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 599 struct in6_addr *in6) 600{ 601 const char *p; 602 u_char *q; 603 MD5_CTX ctxt; 604 u_int8_t digest[16]; 605 char l; 606 char n[64]; /* a single label must not exceed 63 chars */ 607 608 if (!namelen || !name) 609 return -1; 610 611 p = name; 612 while (p && *p && *p != '.' && p - name < namelen) 613 p++; 614 if (p - name > sizeof(n) - 1) 615 return -1; /* label too long */ 616 l = p - name; 617 strncpy(n, name, l); 618 n[(int)l] = '\0'; 619 for (q = n; *q; q++) { 620 if ('A' <= *q && *q <= 'Z') 621 *q = *q - 'A' + 'a'; 622 } 623 624 /* generate 8 bytes of pseudo-random value. */ 625 bzero(&ctxt, sizeof(ctxt)); 626 MD5Init(&ctxt); 627 MD5Update(&ctxt, &l, sizeof(l)); 628 MD5Update(&ctxt, n, l); 629 MD5Final(digest, &ctxt); 630 631 bzero(in6, sizeof(*in6)); 632 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 633 in6->s6_addr8[11] = 2; 634 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 635 if (in6_setscope(in6, ifp, NULL)) 636 return (-1); /* XXX: should not fail */ 637 638 return 0; 639} 640 641/* 642 * XXX multiple loopback interface needs more care. for instance, 643 * nodelocal address needs to be configured onto only one of them. 644 * XXX multiple link-local address case 645 * 646 * altifp - secondary EUI64 source 647 */ 648void 649in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 650{ 651 struct in6_ifaddr *ia; 652 struct in6_addr in6; 653 654 /* some of the interfaces are inherently not IPv6 capable */ 655 switch (ifp->if_type) { 656 case IFT_PFLOG: 657 case IFT_PFSYNC: 658 case IFT_CARP: 659 return; 660 } 661 662 /* 663 * quirks based on interface type 664 */ 665 switch (ifp->if_type) { 666#ifdef IFT_STF 667 case IFT_STF: 668 /* 669 * 6to4 interface is a very special kind of beast. 670 * no multicast, no linklocal. RFC2529 specifies how to make 671 * linklocals for 6to4 interface, but there's no use and 672 * it is rather harmful to have one. 673 */ 674 goto statinit; 675#endif 676 default: 677 break; 678 } 679 680 /* 681 * usually, we require multicast capability to the interface 682 */ 683 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 684 nd6log((LOG_INFO, "in6_ifattach: " 685 "%s is not multicast capable, IPv6 not enabled\n", 686 if_name(ifp))); 687 return; 688 } 689 690 /* 691 * assign loopback address for loopback interface. 692 * XXX multiple loopback interface case. 693 */ 694 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 695 in6 = in6addr_loopback; 696 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 697 if (in6_ifattach_loopback(ifp) != 0) 698 return; 699 } 700 } 701 702 /* 703 * assign a link-local address, if there's none. 704 */ 705 if (V_ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) { 706 ia = in6ifa_ifpforlinklocal(ifp, 0); 707 if (ia == NULL) { 708 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 709 /* linklocal address assigned */ 710 } else { 711 /* failed to assign linklocal address. bark? */ 712 } 713 } 714 } 715 716#ifdef IFT_STF /* XXX */ 717statinit: 718#endif 719 720 /* update dynamically. */ 721 if (V_in6_maxmtu < ifp->if_mtu) 722 V_in6_maxmtu = ifp->if_mtu; 723} 724 725/* 726 * NOTE: in6_ifdetach() does not support loopback if at this moment. 727 * We don't need this function in bsdi, because interfaces are never removed 728 * from the ifnet list in bsdi. 729 */ 730void 731in6_ifdetach(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_mship *imm; 739 740 /* remove neighbor management table */ 741 nd6_purge(ifp); 742 743 /* nuke any of IPv6 addresses we have */ 744 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) { 745 next = ifa->ifa_list.tqe_next; 746 if (ifa->ifa_addr->sa_family != AF_INET6) 747 continue; 748 in6_purgeaddr(ifa); 749 } 750 751 /* undo everything done by in6_ifattach(), just in case */ 752 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) { 753 next = ifa->ifa_list.tqe_next; 754 755 if (ifa->ifa_addr->sa_family != AF_INET6 756 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 757 continue; 758 } 759 760 ia = (struct in6_ifaddr *)ifa; 761 762 /* 763 * leave from multicast groups we have joined for the interface 764 */ 765 while ((imm = ia->ia6_memberships.lh_first) != NULL) { 766 LIST_REMOVE(imm, i6mm_chain); 767 in6_leavegroup(imm); 768 } 769 770 /* remove from the routing table */ 771 if ((ia->ia_flags & IFA_ROUTE) && 772 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 773 rtflags = rt->rt_flags; 774 rtfree(rt); 775 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 776 (struct sockaddr *)&ia->ia_addr, 777 (struct sockaddr *)&ia->ia_prefixmask, 778 rtflags, (struct rtentry **)0); 779 } 780 781 /* remove from the linked list */ 782 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 783 IFAFREE(&ia->ia_ifa); 784 785 /* also remove from the IPv6 address chain(itojun&jinmei) */ 786 oia = ia; 787 if (oia == (ia = V_in6_ifaddr)) 788 V_in6_ifaddr = ia->ia_next; 789 else { 790 while (ia->ia_next && (ia->ia_next != oia)) 791 ia = ia->ia_next; 792 if (ia->ia_next) 793 ia->ia_next = oia->ia_next; 794 else { 795 nd6log((LOG_ERR, 796 "%s: didn't unlink in6ifaddr from list\n", 797 if_name(ifp))); 798 } 799 } 800 801 IFAFREE(&oia->ia_ifa); 802 } 803 804 in6_pcbpurgeif0(&V_udbinfo, ifp); 805 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 806 /* leave from all multicast groups joined */ 807 in6_purgemaddrs(ifp); 808 809 /* 810 * remove neighbor management table. we call it twice just to make 811 * sure we nuke everything. maybe we need just one call. 812 * XXX: since the first call did not release addresses, some prefixes 813 * might remain. We should call nd6_purge() again to release the 814 * prefixes after removing all addresses above. 815 * (Or can we just delay calling nd6_purge until at this point?) 816 */ 817 nd6_purge(ifp); 818 819 /* remove route to link-local allnodes multicast (ff02::1) */ 820 bzero(&sin6, sizeof(sin6)); 821 sin6.sin6_len = sizeof(struct sockaddr_in6); 822 sin6.sin6_family = AF_INET6; 823 sin6.sin6_addr = in6addr_linklocal_allnodes; 824 if (in6_setscope(&sin6.sin6_addr, ifp, NULL)) 825 /* XXX: should not fail */ 826 return; 827 /* XXX grab lock first to avoid LOR */ 828 if (V_rt_tables[0][AF_INET6] != NULL) { 829 RADIX_NODE_HEAD_LOCK(V_rt_tables[0][AF_INET6]); 830 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 831 if (rt) { 832 if (rt->rt_ifp == ifp) 833 rtexpunge(rt); 834 RTFREE_LOCKED(rt); 835 } 836 RADIX_NODE_HEAD_UNLOCK(V_rt_tables[0][AF_INET6]); 837 } 838} 839 840int 841in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 842 const u_int8_t *baseid, int generate) 843{ 844 u_int8_t nullbuf[8]; 845 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 846 847 bzero(nullbuf, sizeof(nullbuf)); 848 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 849 /* we've never created a random ID. Create a new one. */ 850 generate = 1; 851 } 852 853 if (generate) { 854 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 855 856 /* generate_tmp_ifid will update seedn and buf */ 857 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 858 ndi->randomid); 859 } 860 bcopy(ndi->randomid, retbuf, 8); 861 862 return (0); 863} 864 865void 866in6_tmpaddrtimer(void *ignored_arg) 867{ 868 struct nd_ifinfo *ndi; 869 u_int8_t nullbuf[8]; 870 struct ifnet *ifp; 871 872 callout_reset(&V_in6_tmpaddrtimer_ch, 873 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 874 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL); 875 876 bzero(nullbuf, sizeof(nullbuf)); 877 for (ifp = TAILQ_FIRST(&V_ifnet); ifp; 878 ifp = TAILQ_NEXT(ifp, if_list)) { 879 ndi = ND_IFINFO(ifp); 880 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 881 /* 882 * We've been generating a random ID on this interface. 883 * Create a new one. 884 */ 885 (void)generate_tmp_ifid(ndi->randomseed0, 886 ndi->randomseed1, ndi->randomid); 887 } 888 } 889 890} 891 892static void 893in6_purgemaddrs(struct ifnet *ifp) 894{ 895 struct in6_multi *in6m; 896 struct in6_multi *oin6m; 897 898#ifdef DIAGNOSTIC 899 printf("%s: purging ifp %p\n", __func__, ifp); 900#endif 901 902 IFF_LOCKGIANT(ifp); 903 LIST_FOREACH_SAFE(in6m, &in6_multihead, in6m_entry, oin6m) { 904 if (in6m->in6m_ifp == ifp) 905 in6_delmulti(in6m); 906 } 907 IFF_UNLOCKGIANT(ifp); 908} 909