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sys/bsd/netinet6/in6_ifattach.c
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1 /* 2 * Copyright (c) 2003-2012 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 /* $FreeBSD: src/sys/netinet6/in6_ifattach.c,v 1.8 2002/04/19 04:46:22 suz Exp $ */ 29 /* $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $ */ 30 31 /* 32 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 33 * All rights reserved. 34 * 35 * Redistribution and use in source and binary forms, with or without 36 * modification, are permitted provided that the following conditions 37 * are met: 38 * 1. Redistributions of source code must retain the above copyright 39 * notice, this list of conditions and the following disclaimer. 40 * 2. Redistributions in binary form must reproduce the above copyright 41 * notice, this list of conditions and the following disclaimer in the 42 * documentation and/or other materials provided with the distribution. 43 * 3. Neither the name of the project nor the names of its contributors 44 * may be used to endorse or promote products derived from this software 45 * without specific prior written permission. 46 * 47 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 48 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 50 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 51 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 52 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 53 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 54 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 55 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 56 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 57 * SUCH DAMAGE. 58 */ 59 60 #include <sys/param.h> 61 #include <sys/systm.h> 62 #include <sys/malloc.h> 63 #include <sys/socket.h> 64 #include <sys/socketvar.h> 65 #include <sys/sockio.h> 66 #include <sys/kernel.h> 67 #include <sys/syslog.h> 68 #include <libkern/crypto/sha1.h> 69 #include <libkern/OSAtomic.h> 70 #include <kern/lock.h> 71 72 #include <net/if.h> 73 #include <net/if_dl.h> 74 #include <net/if_types.h> 75 #include <net/route.h> 76 #include <net/kpi_protocol.h> 77 78 #include <netinet/in.h> 79 #include <netinet/in_var.h> 80 #include <netinet/if_ether.h> 81 #include <netinet/in_pcb.h> 82 #include <netinet/icmp6.h> 83 84 #include <netinet/ip6.h> 85 #include <netinet6/ip6_var.h> 86 #include <netinet6/in6_var.h> 87 #include <netinet6/in6_pcb.h> 88 #include <netinet6/in6_ifattach.h> 89 #include <netinet6/ip6_var.h> 90 #include <netinet6/nd6.h> 91 #include <netinet6/scope6_var.h> 92 93 #include <net/net_osdep.h> 94 95 #define IN6_IFSTAT_ALLOC_SIZE \ 96 sizeof(void *) + sizeof(struct in6_ifstat) + sizeof(uint64_t) 97 #define ICMP6_IFSTAT_ALLOC_SIZE \ 98 sizeof(void *) + sizeof(struct icmp6_ifstat) + sizeof(uint64_t) 99 100 struct in6_ifstat **in6_ifstat = NULL; 101 struct icmp6_ifstat **icmp6_ifstat = NULL; 102 size_t in6_ifstatmax = 0; 103 size_t icmp6_ifstatmax = 0; 104 u_int32_t in6_maxmtu = 0; 105 extern lck_mtx_t *nd6_mutex; 106 107 #if IP6_AUTO_LINKLOCAL 108 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; 109 #else 110 int ip6_auto_linklocal = 1; /* enable by default */ 111 #endif 112 113 int loopattach6_done = 0; 114 115 extern struct inpcbinfo udbinfo; 116 extern struct inpcbinfo ripcbinfo; 117 118 static int get_rand_ifid(struct ifnet *, struct in6_addr *); 119 static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 120 int in6_get_hw_ifid(struct ifnet *, struct in6_addr *); 121 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 122 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *, struct in6_aliasreq *); 123 static int in6_ifattach_loopback(struct ifnet *); 124 125 /* 126 * Generate a last-resort interface identifier, when the machine has no 127 * IEEE802/EUI64 address sources. 128 * The goal here is to get an interface identifier that is 129 * (1) random enough and (2) does not change across reboot. 130 * We currently use SHA1(hostname) for it. 131 * 132 * in6 - upper 64bits are preserved 133 */ 134 static int 135 get_rand_ifid( 136 __unused struct ifnet *ifp, 137 struct in6_addr *in6) /* upper 64bits are preserved */ 138 { 139 SHA1_CTX ctxt; 140 u_int8_t digest[SHA1_RESULTLEN]; 141 int hostnlen = strlen(hostname); 142 143 #if 0 144 /* we need at least several letters as seed for ifid */ 145 if (len < 3) 146 return -1; 147 #endif 148 149 /* generate 8 bytes of pseudo-random value. */ 150 bzero(&ctxt, sizeof(ctxt)); 151 SHA1Init(&ctxt); 152 SHA1Update(&ctxt, hostname, hostnlen); 153 SHA1Final(digest, &ctxt); 154 155 /* assumes sizeof(digest) > sizeof(ifid) */ 156 bcopy(digest, &in6->s6_addr[8], 8); 157 158 /* make sure to set "u" bit to local, and "g" bit to individual. */ 159 in6->s6_addr[8] &= ~ND6_EUI64_GBIT; /* g bit to "individual" */ 160 in6->s6_addr[8] |= ND6_EUI64_UBIT; /* u bit to "local" */ 161 162 /* convert EUI64 into IPv6 interface identifier */ 163 ND6_EUI64_TO_IFID(in6); 164 165 return 0; 166 } 167 168 static int 169 generate_tmp_ifid( 170 u_int8_t *seed0, 171 const u_int8_t *seed1, 172 u_int8_t *ret) 173 { 174 SHA1_CTX ctxt; 175 u_int8_t seed[16], nullbuf[8], digest[SHA1_RESULTLEN]; 176 u_int32_t val32; 177 struct timeval tv; 178 179 /* If there's no history, start with a random seed. */ 180 bzero(nullbuf, sizeof(nullbuf)); 181 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 182 int i; 183 184 for (i = 0; i < 2; i++) { 185 microtime(&tv); 186 val32 = random() ^ tv.tv_usec; 187 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 188 } 189 } else { 190 bcopy(seed0, seed, 8); 191 } 192 193 /* copy the right-most 64-bits of the given address */ 194 /* XXX assumption on the size of IFID */ 195 bcopy(seed1, &seed[8], 8); 196 197 if (0) { /* for debugging purposes only */ 198 int i; 199 200 printf("generate_tmp_ifid: new randomized ID from: "); 201 for (i = 0; i < 16; i++) 202 printf("%02x", seed[i]); 203 printf(" "); 204 } 205 206 /* generate 16 bytes of pseudo-random value. */ 207 bzero(&ctxt, sizeof(ctxt)); 208 SHA1Init(&ctxt); 209 SHA1Update(&ctxt, seed, sizeof(seed)); 210 SHA1Final(digest, &ctxt); 211 212 /* 213 * RFC 4941 3.2.1. (3) 214 * Take the left-most 64-bits of the SHA1 digest and set bit 6 (the 215 * left-most bit is numbered 0) to zero. 216 */ 217 bcopy(digest, ret, 8); 218 ret[0] &= ~ND6_EUI64_UBIT; 219 220 /* 221 * XXX: we'd like to ensure that the generated value is not zero 222 * for simplicity. If the caclculated digest happens to be zero, 223 * use a random non-zero value as the last resort. 224 */ 225 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 226 nd6log((LOG_INFO, 227 "generate_tmp_ifid: computed SHA1 value is zero.\n")); 228 229 microtime(&tv); 230 val32 = random() ^ tv.tv_usec; 231 val32 = 1 + (val32 % (0xffffffff - 1)); 232 } 233 234 /* 235 * RFC 4941 3.2.1. (4) 236 * Take the next 64-bits of the SHA1 digest and save them in 237 * stable storage as the history value to be used in the next 238 * iteration of the algorithm. 239 */ 240 bcopy(&digest[8], seed0, 8); 241 242 if (0) { /* for debugging purposes only */ 243 int i; 244 245 printf("to: "); 246 for (i = 0; i < 16; i++) 247 printf("%02x", digest[i]); 248 printf("\n"); 249 } 250 251 return 0; 252 } 253 254 /* 255 * Get interface identifier for the specified interface. 256 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 257 * 258 * in6 - upper 64bits are preserved 259 */ 260 int 261 in6_get_hw_ifid( 262 struct ifnet *ifp, 263 struct in6_addr *in6) /* upper 64bits are preserved */ 264 { 265 struct ifaddr *ifa = NULL; 266 struct sockaddr_dl *sdl; 267 u_int8_t *addr; 268 size_t addrlen; 269 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 270 static u_int8_t allone[8] = 271 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 272 int err = -1; 273 274 /* Why doesn't this code use ifnet_addrs? */ 275 ifnet_lock_shared(ifp); 276 ifa = ifp->if_lladdr; 277 sdl = (struct sockaddr_dl *)(void *)ifa->ifa_addr; 278 if (sdl->sdl_alen == 0) { 279 ifnet_lock_done(ifp); 280 return (-1); 281 } 282 IFA_ADDREF(ifa); /* for this routine */ 283 ifnet_lock_done(ifp); 284 285 IFA_LOCK(ifa); 286 addr = (u_int8_t *) LLADDR(sdl); 287 addrlen = sdl->sdl_alen; 288 289 /* get EUI64 */ 290 switch (ifp->if_type) { 291 case IFT_ETHER: 292 case IFT_FDDI: 293 case IFT_ISO88025: 294 case IFT_ATM: 295 case IFT_IEEE1394: 296 case IFT_L2VLAN: 297 case IFT_IEEE8023ADLAG: 298 #if IFT_IEEE80211 299 case IFT_IEEE80211: 300 #endif 301 case IFT_BRIDGE: 302 /* IEEE802/EUI64 cases - what others? */ 303 /* IEEE1394 uses 16byte length address starting with EUI64 */ 304 if (addrlen > 8) 305 addrlen = 8; 306 307 /* look at IEEE802/EUI64 only */ 308 if (addrlen != 8 && addrlen != 6) 309 goto done; 310 311 /* 312 * check for invalid MAC address - on bsdi, we see it a lot 313 * since wildboar configures all-zero MAC on pccard before 314 * card insertion. 315 */ 316 if (bcmp(addr, allzero, addrlen) == 0) 317 goto done; 318 if (bcmp(addr, allone, addrlen) == 0) 319 goto done; 320 321 /* make EUI64 address */ 322 if (addrlen == 8) 323 bcopy(addr, &in6->s6_addr[8], 8); 324 else if (addrlen == 6) { 325 in6->s6_addr[8] = addr[0]; 326 in6->s6_addr[9] = addr[1]; 327 in6->s6_addr[10] = addr[2]; 328 in6->s6_addr[11] = 0xff; 329 in6->s6_addr[12] = 0xfe; 330 in6->s6_addr[13] = addr[3]; 331 in6->s6_addr[14] = addr[4]; 332 in6->s6_addr[15] = addr[5]; 333 } 334 break; 335 336 case IFT_ARCNET: 337 if (addrlen != 1) 338 goto done; 339 if (!addr[0]) 340 goto done; 341 342 bzero(&in6->s6_addr[8], 8); 343 in6->s6_addr[15] = addr[0]; 344 345 /* 346 * due to insufficient bitwidth, we mark it local. 347 */ 348 in6->s6_addr[8] &= ~ND6_EUI64_GBIT; /* g bit to "individual" */ 349 in6->s6_addr[8] |= ND6_EUI64_UBIT; /* u bit to "local" */ 350 break; 351 352 case IFT_GIF: 353 #if IFT_STF 354 case IFT_STF: 355 #endif 356 /* 357 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 358 * however, IPv4 address is not very suitable as unique 359 * identifier source (can be renumbered). 360 * we don't do this. 361 */ 362 goto done; 363 364 case IFT_CELLULAR: 365 goto done; 366 367 default: 368 goto done; 369 } 370 371 /* sanity check: g bit must not indicate "group" */ 372 if (ND6_EUI64_GROUP(in6)) 373 goto done; 374 375 /* convert EUI64 into IPv6 interface identifier */ 376 ND6_EUI64_TO_IFID(in6); 377 378 /* 379 * sanity check: ifid must not be all zero, avoid conflict with 380 * subnet router anycast 381 */ 382 if ((in6->s6_addr[8] & ~(ND6_EUI64_GBIT | ND6_EUI64_UBIT)) == 0x00 && 383 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 384 goto done; 385 } 386 387 err = 0; /* found */ 388 389 done: 390 /* This must not be the last reference to the lladdr */ 391 if (IFA_REMREF_LOCKED(ifa) == NULL) { 392 panic("%s: unexpected (missing) refcnt ifa=%p", __func__, ifa); 393 /* NOTREACHED */ 394 } 395 IFA_UNLOCK(ifa); 396 return (err); 397 } 398 399 /* 400 * Get interface identifier for the specified interface. If it is not 401 * available on ifp0, borrow interface identifier from other information 402 * sources. 403 * 404 * altifp - secondary EUI64 source 405 */ 406 static int 407 get_ifid( 408 struct ifnet *ifp0, 409 struct ifnet *altifp, /* secondary EUI64 source */ 410 struct in6_addr *in6) 411 { 412 struct ifnet *ifp; 413 414 /* first, try to get it from the interface itself */ 415 if (in6_get_hw_ifid(ifp0, in6) == 0) { 416 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 417 if_name(ifp0))); 418 goto success; 419 } 420 421 /* try secondary EUI64 source. this basically is for ATM PVC */ 422 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 423 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 424 if_name(ifp0), if_name(altifp))); 425 goto success; 426 } 427 428 /* next, try to get it from some other hardware interface */ 429 ifnet_head_lock_shared(); 430 TAILQ_FOREACH(ifp, &ifnet_head, if_list) { 431 if (ifp == ifp0) 432 continue; 433 if (in6_get_hw_ifid(ifp, in6) != 0) 434 continue; 435 436 /* 437 * to borrow ifid from other interface, ifid needs to be 438 * globally unique 439 */ 440 if (ND6_IFID_UNIVERSAL(in6)) { 441 nd6log((LOG_DEBUG, 442 "%s: borrow interface identifier from %s\n", 443 if_name(ifp0), if_name(ifp))); 444 ifnet_head_done(); 445 goto success; 446 } 447 } 448 ifnet_head_done(); 449 450 /* last resort: get from random number source */ 451 if (get_rand_ifid(ifp, in6) == 0) { 452 nd6log((LOG_DEBUG, 453 "%s: interface identifier generated by random number\n", 454 if_name(ifp0))); 455 goto success; 456 } 457 458 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 459 return -1; 460 461 success: 462 nd6log((LOG_INFO, "%s: ifid: " 463 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 464 if_name(ifp0), 465 in6->s6_addr[8], in6->s6_addr[9], 466 in6->s6_addr[10], in6->s6_addr[11], 467 in6->s6_addr[12], in6->s6_addr[13], 468 in6->s6_addr[14], in6->s6_addr[15])); 469 return 0; 470 } 471 472 static int 473 in6_ifattach_linklocal( 474 struct ifnet *ifp, 475 struct ifnet *altifp, /* secondary EUI64 source */ 476 struct in6_aliasreq *ifra_passed) 477 { 478 struct in6_ifaddr *ia; 479 struct in6_aliasreq ifra; 480 struct nd_prefix pr0, *pr; 481 int i, error; 482 483 /* 484 * configure link-local address. 485 */ 486 bzero(&ifra, sizeof(ifra)); 487 488 proto_plumb(PF_INET6, ifp); 489 490 /* 491 * in6_update_ifa() does not use ifra_name, but we accurately set it 492 * for safety. 493 */ 494 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 495 496 if ((ifp->if_eflags & IFEF_NOAUTOIPV6LL) != 0 && 497 ifra_passed != NULL) /* interface provided both addresses for us */ 498 bcopy(&ifra_passed->ifra_addr, &(ifra.ifra_addr), sizeof(struct sockaddr_in6)); 499 else { 500 ifra.ifra_addr.sin6_family = AF_INET6; 501 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 502 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 503 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 504 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 505 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 506 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 507 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 508 } else { 509 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 510 nd6log((LOG_ERR, 511 " %s: no ifid available\n", if_name(ifp))); 512 return EADDRNOTAVAIL; 513 } 514 } 515 } 516 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 517 return (EADDRNOTAVAIL); 518 519 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 520 ifra.ifra_prefixmask.sin6_family = AF_INET6; 521 ifra.ifra_prefixmask.sin6_addr = in6mask64; 522 /* link-local addresses should NEVER expire. */ 523 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 524 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 525 526 /* 527 * Now call in6_update_ifa() to do a bunch of procedures to configure 528 * a link-local address. We can set the 3rd argument to NULL, because 529 * we know there's no other link-local address on the interface 530 * and therefore we are adding one (instead of updating one). 531 */ 532 if ((error = in6_update_ifa(ifp, &ifra, NULL, 533 IN6_IFAUPDATE_DADDELAY, M_WAITOK)) != 0) { 534 /* 535 * XXX: When the interface does not support IPv6, this call 536 * would fail in the SIOCSIFADDR ioctl. I believe the 537 * notification is rather confusing in this case, so just 538 * suppress it. (jinmei@kame.net 20010130) 539 */ 540 if (error != EAFNOSUPPORT) 541 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 542 "configure a link-local address on %s " 543 "(errno=%d)\n", 544 if_name(ifp), error)); 545 return (EADDRNOTAVAIL); 546 } 547 548 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 549 #if DIAGNOSTIC 550 if (!ia) { 551 panic("ia == NULL in in6_ifattach_linklocal"); 552 /*NOTREACHED*/ 553 } 554 #endif 555 /* 556 * Make the link-local prefix (fe80::%link/64) as on-link. 557 * Since we'd like to manage prefixes separately from addresses, 558 * we make an ND6 prefix structure for the link-local prefix, 559 * and add it to the prefix list as a never-expire prefix. 560 * XXX: this change might affect some existing code base... 561 */ 562 bzero(&pr0, sizeof(pr0)); 563 lck_mtx_init(&pr0.ndpr_lock, ifa_mtx_grp, ifa_mtx_attr); 564 pr0.ndpr_ifp = ifp; 565 /* this should be 64 at this moment. */ 566 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 567 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 568 pr0.ndpr_prefix = ifra.ifra_addr; 569 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 570 for (i = 0; i < 4; i++) { 571 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 572 in6mask64.s6_addr32[i]; 573 } 574 /* 575 * Initialize parameters. The link-local prefix must always be 576 * on-link, and its lifetimes never expire. 577 */ 578 pr0.ndpr_raf_onlink = 1; 579 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 580 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 581 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 582 pr0.ndpr_stateflags |= NDPRF_STATIC; 583 /* 584 * Since there is no other link-local addresses, nd6_prefix_lookup() 585 * probably returns NULL. However, we cannot always expect the result. 586 * For example, if we first remove the (only) existing link-local 587 * address, and then reconfigure another one, the prefix is still 588 * valid with referring to the old link-local address. 589 */ 590 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 591 if ((error = nd6_prelist_add(&pr0, NULL, &pr, TRUE)) != 0) { 592 IFA_REMREF(&ia->ia_ifa); 593 lck_mtx_destroy(&pr0.ndpr_lock, ifa_mtx_grp); 594 return(error); 595 } 596 } 597 598 if (ia != NULL) { 599 in6_post_msg(ifp, KEV_INET6_NEW_LL_ADDR, ia); 600 IFA_REMREF(&ia->ia_ifa); 601 } 602 603 /* Drop use count held above during lookup/add */ 604 if (pr != NULL) 605 NDPR_REMREF(pr); 606 607 lck_mtx_destroy(&pr0.ndpr_lock, ifa_mtx_grp); 608 609 return 0; 610 } 611 612 static int 613 in6_ifattach_loopback( 614 struct ifnet *ifp) /* must be IFT_LOOP */ 615 { 616 struct in6_aliasreq ifra; 617 int error; 618 619 bzero(&ifra, sizeof(ifra)); 620 621 /* 622 * in6_update_ifa() does not use ifra_name, but we accurately set it 623 * for safety. 624 */ 625 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 626 627 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 628 ifra.ifra_prefixmask.sin6_family = AF_INET6; 629 ifra.ifra_prefixmask.sin6_addr = in6mask128; 630 631 /* 632 * Always initialize ia_dstaddr (= broadcast address) to loopback 633 * address. Follows IPv4 practice - see in_ifinit(). 634 */ 635 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 636 ifra.ifra_dstaddr.sin6_family = AF_INET6; 637 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 638 639 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 640 ifra.ifra_addr.sin6_family = AF_INET6; 641 ifra.ifra_addr.sin6_addr = in6addr_loopback; 642 643 /* the loopback address should NEVER expire. */ 644 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 645 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 646 647 /* we don't need to perform DAD on loopback interfaces. */ 648 ifra.ifra_flags |= IN6_IFF_NODAD; 649 650 /* skip registration to the prefix list. XXX should be temporary. */ 651 ifra.ifra_flags |= IN6_IFF_NOPFX; 652 653 /* 654 * We are sure that this is a newly assigned address, so we can set 655 * NULL to the 3rd arg. 656 */ 657 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0, M_WAITOK)) != 0) { 658 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 659 "the loopback address on %s (errno=%d)\n", 660 if_name(ifp), error)); 661 return (EADDRNOTAVAIL); 662 } 663 664 return 0; 665 } 666 667 /* 668 * compute NI group address, based on the current hostname setting. 669 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 670 * 671 * when ifp == NULL, the caller is responsible for filling scopeid. 672 */ 673 int 674 in6_nigroup( 675 struct ifnet *ifp, 676 const char *name, 677 int namelen, 678 struct in6_addr *in6) 679 { 680 const char *p; 681 u_char *q; 682 SHA1_CTX ctxt; 683 u_int8_t digest[SHA1_RESULTLEN]; 684 char l; 685 char n[64]; /* a single label must not exceed 63 chars */ 686 687 if (!namelen || !name) 688 return -1; 689 690 p = name; 691 while (p && *p && *p != '.' && p - name < namelen) 692 p++; 693 if (p - name > sizeof(n) - 1) 694 return -1; /* label too long */ 695 l = p - name; 696 strncpy(n, name, l); 697 n[(int)l] = '\0'; 698 for (q = (u_char *) n; *q; q++) { 699 if ('A' <= *q && *q <= 'Z') 700 *q = *q - 'A' + 'a'; 701 } 702 703 /* generate 8 bytes of pseudo-random value. */ 704 bzero(&ctxt, sizeof(ctxt)); 705 SHA1Init(&ctxt); 706 SHA1Update(&ctxt, &l, sizeof(l)); 707 SHA1Update(&ctxt, n, l); 708 SHA1Final(digest, &ctxt); 709 710 bzero(in6, sizeof(*in6)); 711 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 712 in6->s6_addr8[11] = 2; 713 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 714 if (in6_setscope(in6, ifp, NULL)) 715 return (-1); /* XXX: should not fail */ 716 717 return 0; 718 } 719 720 int 721 in6_domifattach(struct ifnet *ifp) 722 { 723 int error = 0; 724 725 if ((error = proto_plumb(PF_INET6, ifp))) { 726 if (error != EEXIST) 727 log(LOG_ERR, "%s: proto_plumb returned %d if=%s%d\n", 728 __func__, error, ifp->if_name, ifp->if_unit); 729 } else { 730 nd6_ifattach(ifp); 731 scope6_ifattach(ifp); 732 } 733 734 return (error); 735 } 736 737 738 /* 739 * XXX multiple loopback interface needs more care. for instance, 740 * nodelocal address needs to be configured onto only one of them. 741 * XXX multiple link-local address case 742 */ 743 int 744 in6_ifattach( 745 struct ifnet *ifp, 746 struct ifnet *altifp, /* secondary EUI64 source */ 747 struct in6_aliasreq *ifra) 748 { 749 static size_t if_indexlim = 8; 750 struct in6_ifaddr *ia; 751 struct in6_addr in6; 752 int error; 753 void *buf; 754 755 lck_rw_lock_exclusive(&in6_ifs_rwlock); 756 /* 757 * We have some arrays that should be indexed by if_index. 758 * since if_index will grow dynamically, they should grow too. 759 * struct in6_ifstat **in6_ifstat 760 * struct icmp6_ifstat **icmp6_ifstat 761 */ 762 if (in6_ifstat == NULL || icmp6_ifstat == NULL || 763 if_index >= if_indexlim) { 764 while (if_index >= if_indexlim) 765 if_indexlim <<= 1; 766 } 767 768 /* grow in6_ifstat */ 769 if (in6_ifstatmax < if_indexlim) { 770 size_t n; 771 caddr_t q; 772 773 n = if_indexlim * sizeof(struct in6_ifstat *); 774 q = (caddr_t)_MALLOC(n, M_IFADDR, M_WAITOK|M_ZERO); 775 if (q == NULL) { 776 lck_rw_done(&in6_ifs_rwlock); 777 return ENOBUFS; 778 } 779 if (in6_ifstat) { 780 bcopy((caddr_t)in6_ifstat, q, 781 in6_ifstatmax * sizeof(struct in6_ifstat *)); 782 FREE((caddr_t)in6_ifstat, M_IFADDR); 783 } 784 in6_ifstat = (struct in6_ifstat **)(void *)q; 785 in6_ifstatmax = if_indexlim; 786 } 787 788 if (in6_ifstat[ifp->if_index] == NULL) { 789 buf = _MALLOC(IN6_IFSTAT_ALLOC_SIZE, M_IFADDR, M_WAITOK); 790 if (buf == NULL) { 791 lck_rw_done(&in6_ifs_rwlock); 792 return ENOBUFS; 793 } 794 bzero(buf, IN6_IFSTAT_ALLOC_SIZE); 795 in6_ifstat[ifp->if_index] = (struct in6_ifstat *) 796 P2ROUNDUP((intptr_t)buf + sizeof(void *), sizeof(uint64_t)); 797 VERIFY(IS_P2ALIGNED(in6_ifstat[ifp->if_index], sizeof(uint64_t))); 798 } 799 lck_rw_done(&in6_ifs_rwlock); 800 801 lck_rw_lock_exclusive(&icmp6_ifs_rwlock); 802 if (icmp6_ifstatmax < if_indexlim) { 803 size_t n; 804 caddr_t q; 805 806 n = if_indexlim * sizeof(struct icmp6_ifstat *); 807 q = (caddr_t)_MALLOC(n, M_IFADDR, M_WAITOK|M_ZERO); 808 if (q == NULL) { 809 lck_rw_done(&icmp6_ifs_rwlock); 810 return ENOBUFS; 811 } 812 if (icmp6_ifstat) { 813 bcopy((caddr_t)icmp6_ifstat, q, 814 icmp6_ifstatmax * sizeof(struct icmp6_ifstat *)); 815 FREE((caddr_t)icmp6_ifstat, M_IFADDR); 816 } 817 icmp6_ifstat = (struct icmp6_ifstat **)(void *)q; 818 icmp6_ifstatmax = if_indexlim; 819 } 820 821 if (icmp6_ifstat[ifp->if_index] == NULL) { 822 buf = _MALLOC(ICMP6_IFSTAT_ALLOC_SIZE, M_IFADDR, M_WAITOK); 823 if (buf == NULL) { 824 lck_rw_done(&icmp6_ifs_rwlock); 825 return ENOBUFS; 826 } 827 bzero(buf, ICMP6_IFSTAT_ALLOC_SIZE); 828 icmp6_ifstat[ifp->if_index] = (struct icmp6_ifstat *) 829 P2ROUNDUP((intptr_t)buf + sizeof(void *), sizeof(uint64_t)); 830 VERIFY(IS_P2ALIGNED(icmp6_ifstat[ifp->if_index], sizeof(uint64_t))); 831 } 832 lck_rw_done(&icmp6_ifs_rwlock); 833 834 /* initialize NDP variables */ 835 if ((error = nd6_ifattach(ifp)) != 0) 836 return error; 837 838 /* initialize scope identifiers */ 839 if ((error = scope6_ifattach(ifp)) != 0) 840 return error; 841 842 /* 843 * quirks based on interface type 844 */ 845 switch (ifp->if_type) { 846 #if IFT_STF 847 case IFT_STF: 848 /* 849 * 6to4 interface is a very special kind of beast. 850 * no multicast, no linklocal. RFC2529 specifies how to make 851 * linklocals for 6to4 interface, but there's no use and 852 * it is rather harmful to have one. 853 */ 854 goto statinit; 855 #endif 856 default: 857 break; 858 } 859 860 /* 861 * usually, we require multicast capability to the interface 862 */ 863 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 864 nd6log((LOG_INFO, "in6_ifattach: ", 865 "%s is not multicast capable, IPv6 not enabled\n", 866 if_name(ifp))); 867 return EINVAL; 868 } 869 870 /* 871 * assign loopback address for loopback interface. 872 * XXX multiple loopback interface case. 873 */ 874 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 875 struct in6_ifaddr *ia6 = NULL; 876 if (!OSCompareAndSwap(0, 1, (UInt32 *)&loopattach6_done)) { 877 in6 = in6addr_loopback; 878 if ((ia6 = in6ifa_ifpwithaddr(ifp, &in6)) == NULL) { 879 if (in6_ifattach_loopback(ifp) != 0) { 880 OSCompareAndSwap(1, 0, (UInt32 *)&loopattach6_done); 881 return EINVAL; 882 } 883 } 884 else { 885 IFA_REMREF(&ia6->ia_ifa); 886 } 887 } 888 } 889 890 /* 891 * assign a link-local address, if there's none. 892 */ 893 if (ip6_auto_linklocal) { 894 ia = in6ifa_ifpforlinklocal(ifp, 0); 895 if (ia == NULL) { 896 if (in6_ifattach_linklocal(ifp, altifp, ifra) == 0) { 897 /* linklocal address assigned */ 898 } else { 899 nd6log((LOG_INFO, "in6_ifattach: %s failed to " 900 "attach a linklocal address.\n", 901 if_name(ifp))); 902 /* failed to assign linklocal address. bark? */ 903 } 904 } else { 905 IFA_REMREF(&ia->ia_ifa); 906 } 907 } 908 909 #if IFT_STF /* XXX */ 910 statinit: 911 #endif 912 913 /* update dynamically. */ 914 if (in6_maxmtu < ifp->if_mtu) 915 in6_maxmtu = ifp->if_mtu; 916 917 return 0; 918 } 919 920 /* 921 * NOTE: in6_ifdetach() does not support loopback if at this moment. 922 */ 923 void 924 in6_ifdetach(struct ifnet *ifp) 925 { 926 struct in6_ifaddr *ia, *oia; 927 struct ifaddr *ifa; 928 struct rtentry *rt; 929 struct sockaddr_in6 sin6; 930 struct in6_multi_mship *imm; 931 int unlinked; 932 933 lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_NOTOWNED); 934 935 /* remove neighbor management table */ 936 nd6_purge(ifp); 937 938 /* nuke any of IPv6 addresses we have */ 939 lck_rw_lock_exclusive(&in6_ifaddr_rwlock); 940 ia = in6_ifaddrs; 941 while (ia != NULL) { 942 if (ia->ia_ifa.ifa_ifp != ifp) { 943 ia = ia->ia_next; 944 continue; 945 } 946 IFA_ADDREF(&ia->ia_ifa); /* for us */ 947 lck_rw_done(&in6_ifaddr_rwlock); 948 in6_purgeaddr(&ia->ia_ifa); 949 IFA_REMREF(&ia->ia_ifa); /* for us */ 950 lck_rw_lock_exclusive(&in6_ifaddr_rwlock); 951 /* 952 * Purging the address caused in6_ifaddr_rwlock 953 * to be dropped and reacquired; 954 * therefore search again from the beginning 955 * of in6_ifaddrs list. 956 */ 957 ia = in6_ifaddrs; 958 } 959 lck_rw_done(&in6_ifaddr_rwlock); 960 961 ifnet_lock_exclusive(ifp); 962 963 /* undo everything done by in6_ifattach(), just in case */ 964 ifa = TAILQ_FIRST(&ifp->if_addrlist); 965 while (ifa != NULL) { 966 IFA_LOCK(ifa); 967 if (ifa->ifa_addr->sa_family != AF_INET6 || 968 !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)-> 969 sin6_addr)) { 970 IFA_UNLOCK(ifa); 971 ifa = TAILQ_NEXT(ifa, ifa_list); 972 continue; 973 } 974 975 ia = (struct in6_ifaddr *)ifa; 976 977 /* hold a reference for this routine */ 978 IFA_ADDREF_LOCKED(ifa); 979 /* remove from the linked list */ 980 if_detach_ifa(ifp, ifa); 981 IFA_UNLOCK(ifa); 982 983 /* 984 * Leaving the multicast group(s) may involve freeing the 985 * link address multicast structure(s) for the interface, 986 * which is protected by ifnet lock. To avoid violating 987 * lock ordering, we must drop ifnet lock before doing so. 988 * The ifa won't go away since we held a refcnt above. 989 */ 990 ifnet_lock_done(ifp); 991 992 /* 993 * We have to do this work manually here instead of calling 994 * in6_purgeaddr() since in6_purgeaddr() uses the RTM_HOST flag. 995 */ 996 997 /* 998 * leave from multicast groups we have joined for the interface 999 */ 1000 IFA_LOCK(ifa); 1001 while ((imm = ia->ia6_memberships.lh_first) != NULL) { 1002 LIST_REMOVE(imm, i6mm_chain); 1003 IFA_UNLOCK(ifa); 1004 in6_leavegroup(imm); 1005 IFA_LOCK(ifa); 1006 } 1007 1008 /* remove from the routing table */ 1009 if (ia->ia_flags & IFA_ROUTE) { 1010 IFA_UNLOCK(ifa); 1011 rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0); 1012 if (rt != NULL) { 1013 (void) rtrequest(RTM_DELETE, 1014 (struct sockaddr *)&ia->ia_addr, 1015 (struct sockaddr *)&ia->ia_addr, 1016 (struct sockaddr *)&ia->ia_prefixmask, 1017 rt->rt_flags, (struct rtentry **)0); 1018 rtfree(rt); 1019 } 1020 } else { 1021 IFA_UNLOCK(ifa); 1022 } 1023 1024 /* also remove from the IPv6 address chain(itojun&jinmei) */ 1025 unlinked = 1; 1026 oia = ia; 1027 lck_rw_lock_exclusive(&in6_ifaddr_rwlock); 1028 if (oia == (ia = in6_ifaddrs)) { 1029 in6_ifaddrs = ia->ia_next; 1030 } else { 1031 while (ia->ia_next && (ia->ia_next != oia)) 1032 ia = ia->ia_next; 1033 if (ia->ia_next) { 1034 ia->ia_next = oia->ia_next; 1035 } else { 1036 nd6log((LOG_ERR, 1037 "%s: didn't unlink in6ifaddr from " 1038 "list\n", if_name(ifp))); 1039 unlinked = 0; 1040 } 1041 } 1042 lck_rw_done(&in6_ifaddr_rwlock); 1043 1044 ifa = &oia->ia_ifa; 1045 /* 1046 * release another refcnt for the link from in6_ifaddrs. 1047 * Do this only if it's not already unlinked in the event 1048 * that we lost the race, since in6_ifaddr_rwlock was momentarily 1049 * dropped above. 1050 */ 1051 if (unlinked) 1052 IFA_REMREF(ifa); 1053 /* release reference held for this routine */ 1054 IFA_REMREF(ifa); 1055 1056 /* 1057 * This is suboptimal, but since we dropped ifnet lock above 1058 * the list might have changed. Repeat the search from the 1059 * beginning until we find the first eligible IPv6 address. 1060 */ 1061 ifnet_lock_exclusive(ifp); 1062 ifa = TAILQ_FIRST(&ifp->if_addrlist); 1063 } 1064 ifnet_lock_done(ifp); 1065 1066 /* 1067 * remove neighbor management table. we call it twice just to make 1068 * sure we nuke everything. maybe we need just one call. 1069 * XXX: since the first call did not release addresses, some prefixes 1070 * might remain. We should call nd6_purge() again to release the 1071 * prefixes after removing all addresses above. 1072 * (Or can we just delay calling nd6_purge until at this point?) 1073 */ 1074 nd6_purge(ifp); 1075 1076 /* remove route to link-local allnodes multicast (ff02::1) */ 1077 bzero(&sin6, sizeof(sin6)); 1078 sin6.sin6_len = sizeof(struct sockaddr_in6); 1079 sin6.sin6_family = AF_INET6; 1080 sin6.sin6_addr = in6addr_linklocal_allnodes; 1081 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1082 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0); 1083 if (rt != NULL) { 1084 RT_LOCK(rt); 1085 if (rt->rt_ifp == ifp) { 1086 /* 1087 * Prevent another thread from modifying rt_key, 1088 * rt_gateway via rt_setgate() after the rt_lock 1089 * is dropped by marking the route as defunct. 1090 */ 1091 rt->rt_flags |= RTF_CONDEMNED; 1092 RT_UNLOCK(rt); 1093 (void) rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1094 rt_mask(rt), rt->rt_flags, 0); 1095 } else { 1096 RT_UNLOCK(rt); 1097 } 1098 rtfree(rt); 1099 } 1100 } 1101 1102 void 1103 in6_get_tmpifid( 1104 struct ifnet *ifp, 1105 u_int8_t *retbuf, 1106 const u_int8_t *baseid, 1107 int generate) 1108 { 1109 u_int8_t nullbuf[8]; 1110 struct nd_ifinfo *ndi; 1111 1112 lck_rw_lock_shared(nd_if_rwlock); 1113 ndi = ND_IFINFO(ifp); 1114 VERIFY(ndi != NULL && ndi->initialized); 1115 lck_mtx_lock(&ndi->lock); 1116 bzero(nullbuf, sizeof(nullbuf)); 1117 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 1118 /* we've never created a random ID. Create a new one. */ 1119 generate = 1; 1120 } 1121 1122 if (generate) { 1123 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 1124 1125 /* generate_tmp_ifid will update seedn and buf */ 1126 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 1127 ndi->randomid); 1128 } 1129 bcopy(ndi->randomid, retbuf, 8); 1130 lck_mtx_unlock(&ndi->lock); 1131 lck_rw_done(nd_if_rwlock); 1132 } 1133 1134 void 1135 in6_tmpaddrtimer(void *arg) 1136 { 1137 #pragma unused(arg) 1138 int i; 1139 struct nd_ifinfo *ndi; 1140 u_int8_t nullbuf[8]; 1141 1142 timeout(in6_tmpaddrtimer, (caddr_t)0, 1143 (ip6_temp_preferred_lifetime - ip6_desync_factor - 1144 ip6_temp_regen_advance) * hz); 1145 1146 lck_rw_lock_shared(nd_if_rwlock); 1147 bzero(nullbuf, sizeof(nullbuf)); 1148 for (i = 1; i < if_index + 1; i++) { 1149 if (!nd_ifinfo || i >= nd_ifinfo_indexlim) 1150 break; 1151 ndi = &nd_ifinfo[i]; 1152 if (!ndi->initialized) 1153 continue; 1154 lck_mtx_lock(&ndi->lock); 1155 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 1156 /* 1157 * We've been generating a random ID on this interface. 1158 * Create a new one. 1159 */ 1160 (void)generate_tmp_ifid(ndi->randomseed0, 1161 ndi->randomseed1, 1162 ndi->randomid); 1163 } 1164 lck_mtx_unlock(&ndi->lock); 1165 } 1166 lck_rw_done(nd_if_rwlock); 1167 }
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