1/* 2 * Copyright (c) 2003-2014 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 29/* 30 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 31 * All rights reserved. 32 * 33 * Redistribution and use in source and binary forms, with or without 34 * modification, are permitted provided that the following conditions 35 * are met: 36 * 1. Redistributions of source code must retain the above copyright 37 * notice, this list of conditions and the following disclaimer. 38 * 2. Redistributions in binary form must reproduce the above copyright 39 * notice, this list of conditions and the following disclaimer in the 40 * documentation and/or other materials provided with the distribution. 41 * 3. Neither the name of the project nor the names of its contributors 42 * may be used to endorse or promote products derived from this software 43 * without specific prior written permission. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 48 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 55 * SUCH DAMAGE. 56 */ 57 58#include <sys/param.h> 59#include <sys/systm.h> 60#include <sys/malloc.h> 61#include <sys/socket.h> 62#include <sys/socketvar.h> 63#include <sys/sockio.h> 64#include <sys/kernel.h> 65#include <sys/syslog.h> 66#include <libkern/crypto/sha1.h> 67#include <libkern/OSAtomic.h> 68#include <kern/locks.h> 69 70#include <net/if.h> 71#include <net/if_dl.h> 72#include <net/if_types.h> 73#include <net/route.h> 74#include <net/kpi_protocol.h> 75 76#include <netinet/in.h> 77#include <netinet/in_var.h> 78#include <netinet/if_ether.h> 79#include <netinet/in_pcb.h> 80#include <netinet/icmp6.h> 81 82#include <netinet/ip6.h> 83#include <netinet6/ip6_var.h> 84#include <netinet6/in6_var.h> 85#include <netinet6/in6_pcb.h> 86#include <netinet6/in6_ifattach.h> 87#include <netinet6/ip6_var.h> 88#include <netinet6/nd6.h> 89#include <netinet6/scope6_var.h> 90 91#include <net/net_osdep.h> 92#include <dev/random/randomdev.h> 93 94u_int32_t in6_maxmtu = 0; 95extern lck_mtx_t *nd6_mutex; 96 97#if IP6_AUTO_LINKLOCAL 98int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; 99#else 100int ip6_auto_linklocal = 1; /* enable by default */ 101#endif 102 103extern struct inpcbinfo udbinfo; 104extern struct inpcbinfo ripcbinfo; 105 106static const unsigned int in6_extra_size = sizeof(struct in6_ifextra); 107static const unsigned int in6_extra_bufsize = in6_extra_size + 108 sizeof(void *) + sizeof(uint64_t); 109 110static int get_rand_iid(struct ifnet *, struct in6_addr *); 111static int in6_generate_tmp_iid(u_int8_t *, const u_int8_t *, u_int8_t *); 112static int in6_select_iid_from_all_hw(struct ifnet *, struct ifnet *, 113 struct in6_addr *); 114static int in6_ifattach_linklocal(struct ifnet *, struct in6_aliasreq *); 115static int in6_ifattach_loopback(struct ifnet *); 116 117/* 118 * Generate a last-resort interface identifier, when the machine has no 119 * IEEE802/EUI64 address sources. 120 * The goal here is to get an interface identifier that is 121 * (1) random enough and (2) does not change across reboot. 122 * We currently use SHA1(hostname) for it. 123 * 124 * in6 - upper 64bits are preserved 125 */ 126static int 127get_rand_iid( 128 __unused struct ifnet *ifp, 129 struct in6_addr *in6) /* upper 64bits are preserved */ 130{ 131 SHA1_CTX ctxt; 132 u_int8_t digest[SHA1_RESULTLEN]; 133 int hostnlen = strlen(hostname); 134 135 /* generate 8 bytes of pseudo-random value. */ 136 bzero(&ctxt, sizeof (ctxt)); 137 SHA1Init(&ctxt); 138 SHA1Update(&ctxt, hostname, hostnlen); 139 SHA1Final(digest, &ctxt); 140 141 /* assumes sizeof (digest) > sizeof (iid) */ 142 bcopy(digest, &in6->s6_addr[8], 8); 143 144 /* make sure to set "u" bit to local, and "g" bit to individual. */ 145 in6->s6_addr[8] &= ~ND6_EUI64_GBIT; /* g bit to "individual" */ 146 in6->s6_addr[8] |= ND6_EUI64_UBIT; /* u bit to "local" */ 147 148 /* convert EUI64 into IPv6 interface identifier */ 149 ND6_EUI64_TO_IFID(in6); 150 151 return (0); 152} 153 154static int 155in6_generate_tmp_iid( 156 u_int8_t *seed0, 157 const u_int8_t *seed1, 158 u_int8_t *ret) 159{ 160 SHA1_CTX ctxt; 161 u_int8_t seed[16], nullbuf[8], digest[SHA1_RESULTLEN]; 162 u_int32_t val32; 163 struct timeval tv; 164 165 /* If there's no history, start with a random seed. */ 166 bzero(nullbuf, sizeof (nullbuf)); 167 if (bcmp(nullbuf, seed0, sizeof (nullbuf)) == 0) { 168 int i; 169 170 for (i = 0; i < 2; i++) { 171 getmicrotime(&tv); 172 val32 = RandomULong() ^ tv.tv_usec; 173 bcopy(&val32, seed + sizeof (val32) * i, 174 sizeof (val32)); 175 } 176 } else { 177 bcopy(seed0, seed, 8); 178 } 179 180 /* copy the right-most 64-bits of the given address */ 181 /* XXX assumption on the size of IFID */ 182 bcopy(seed1, &seed[8], 8); 183 184 if ((0)) { /* for debugging purposes only */ 185 int i; 186 187 printf("%s: new randomized ID from: ", __func__); 188 for (i = 0; i < 16; i++) 189 printf("%02x", seed[i]); 190 printf(" "); 191 } 192 193 /* generate 16 bytes of pseudo-random value. */ 194 bzero(&ctxt, sizeof (ctxt)); 195 SHA1Init(&ctxt); 196 SHA1Update(&ctxt, seed, sizeof (seed)); 197 SHA1Final(digest, &ctxt); 198 199 /* 200 * RFC 4941 3.2.1. (3) 201 * Take the left-most 64-bits of the SHA1 digest and set bit 6 (the 202 * left-most bit is numbered 0) to zero. 203 */ 204 bcopy(digest, ret, 8); 205 ret[0] &= ~ND6_EUI64_UBIT; 206 207 /* 208 * XXX: we'd like to ensure that the generated value is not zero 209 * for simplicity. If the caclculated digest happens to be zero, 210 * use a random non-zero value as the last resort. 211 */ 212 if (bcmp(nullbuf, ret, sizeof (nullbuf)) == 0) { 213 nd6log((LOG_INFO, 214 "%s: computed SHA1 value is zero.\n", __func__)); 215 216 getmicrotime(&tv); 217 val32 = random() ^ tv.tv_usec; 218 val32 = 1 + (val32 % (0xffffffff - 1)); 219 } 220 221 /* 222 * RFC 4941 3.2.1. (4) 223 * Take the next 64-bits of the SHA1 digest and save them in 224 * stable storage as the history value to be used in the next 225 * iteration of the algorithm. 226 */ 227 bcopy(&digest[8], seed0, 8); 228 229 if ((0)) { /* for debugging purposes only */ 230 int i; 231 232 printf("to: "); 233 for (i = 0; i < 16; i++) 234 printf("%02x", digest[i]); 235 printf("\n"); 236 } 237 238 return (0); 239} 240 241/* 242 * Get interface identifier for the specified interface using the method in 243 * Appendix A of RFC 4291. 244 * 245 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 246 * 247 * in6 - upper 64bits are preserved 248 */ 249int 250in6_iid_from_hw(struct ifnet *ifp, struct in6_addr *in6) 251{ 252 struct ifaddr *ifa = NULL; 253 struct sockaddr_dl *sdl; 254 u_int8_t *addr; 255 size_t addrlen; 256 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 257 static u_int8_t allone[8] = 258 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 259 int err = -1; 260 261 /* Why doesn't this code use ifnet_addrs? */ 262 ifnet_lock_shared(ifp); 263 ifa = ifp->if_lladdr; 264 sdl = (struct sockaddr_dl *)(void *)ifa->ifa_addr; 265 if (sdl->sdl_alen == 0) { 266 ifnet_lock_done(ifp); 267 return (-1); 268 } 269 IFA_ADDREF(ifa); /* for this routine */ 270 ifnet_lock_done(ifp); 271 272 IFA_LOCK(ifa); 273 addr = (u_int8_t *) LLADDR(sdl); 274 addrlen = sdl->sdl_alen; 275 276 /* get EUI64 */ 277 switch (ifp->if_type) { 278 case IFT_ETHER: 279 case IFT_FDDI: 280 case IFT_ISO88025: 281 case IFT_ATM: 282 case IFT_IEEE1394: 283 case IFT_L2VLAN: 284 case IFT_IEEE8023ADLAG: 285#if IFT_IEEE80211 286 case IFT_IEEE80211: 287#endif 288 case IFT_BRIDGE: 289 /* IEEE802/EUI64 cases - what others? */ 290 /* IEEE1394 uses 16byte length address starting with EUI64 */ 291 if (addrlen > 8) 292 addrlen = 8; 293 294 /* look at IEEE802/EUI64 only */ 295 if (addrlen != 8 && addrlen != 6) 296 goto done; 297 298 /* 299 * check for invalid MAC address - on bsdi, we see it a lot 300 * since wildboar configures all-zero MAC on pccard before 301 * card insertion. 302 */ 303 if (bcmp(addr, allzero, addrlen) == 0) 304 goto done; 305 if (bcmp(addr, allone, addrlen) == 0) 306 goto done; 307 308 /* make EUI64 address */ 309 if (addrlen == 8) 310 bcopy(addr, &in6->s6_addr[8], 8); 311 else if (addrlen == 6) { 312 in6->s6_addr[8] = addr[0]; 313 in6->s6_addr[9] = addr[1]; 314 in6->s6_addr[10] = addr[2]; 315 in6->s6_addr[11] = 0xff; 316 in6->s6_addr[12] = 0xfe; 317 in6->s6_addr[13] = addr[3]; 318 in6->s6_addr[14] = addr[4]; 319 in6->s6_addr[15] = addr[5]; 320 } 321 break; 322 323 case IFT_ARCNET: 324 if (addrlen != 1) 325 goto done; 326 if (!addr[0]) 327 goto done; 328 329 bzero(&in6->s6_addr[8], 8); 330 in6->s6_addr[15] = addr[0]; 331 332 /* 333 * due to insufficient bitwidth, we mark it local. 334 */ 335 in6->s6_addr[8] &= ~ND6_EUI64_GBIT; /* g to "individual" */ 336 in6->s6_addr[8] |= ND6_EUI64_UBIT; /* u to "local" */ 337 break; 338 339 case IFT_GIF: 340#if IFT_STF 341 case IFT_STF: 342#endif 343 /* 344 * RFC2893 says: "SHOULD use IPv4 address as IID source". 345 * however, IPv4 address is not very suitable as unique 346 * identifier source (can be renumbered). 347 * we don't do this. 348 */ 349 goto done; 350 351 case IFT_CELLULAR: 352 goto done; 353 354 default: 355 goto done; 356 } 357 358 /* sanity check: g bit must not indicate "group" */ 359 if (ND6_EUI64_GROUP(in6)) 360 goto done; 361 362 /* convert EUI64 into IPv6 interface identifier */ 363 ND6_EUI64_TO_IFID(in6); 364 365 /* 366 * sanity check: iid must not be all zero, avoid conflict with 367 * subnet router anycast 368 */ 369 if ((in6->s6_addr[8] & ~(ND6_EUI64_GBIT | ND6_EUI64_UBIT)) == 0x00 && 370 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 371 goto done; 372 } 373 374 err = 0; /* found */ 375 376done: 377 /* This must not be the last reference to the lladdr */ 378 if (IFA_REMREF_LOCKED(ifa) == NULL) { 379 panic("%s: unexpected (missing) refcnt ifa=%p", __func__, ifa); 380 /* NOTREACHED */ 381 } 382 IFA_UNLOCK(ifa); 383 return (err); 384} 385 386/* 387 * Get interface identifier for the specified interface using the method in 388 * Appendix A of RFC 4291. If it is not available on ifp0, borrow interface 389 * identifier from other information sources. 390 * 391 * ifp - primary EUI64 source 392 * altifp - secondary EUI64 source 393 * in6 - IPv6 address to output IID 394 */ 395static int 396in6_select_iid_from_all_hw( 397 struct ifnet *ifp0, 398 struct ifnet *altifp, /* secondary EUI64 source */ 399 struct in6_addr *in6) 400{ 401 struct ifnet *ifp; 402 403 /* first, try to get it from the interface itself */ 404 if (in6_iid_from_hw(ifp0, in6) == 0) { 405 nd6log((LOG_DEBUG, "%s: IID derived from HW interface.\n", 406 if_name(ifp0))); 407 goto success; 408 } 409 410 /* try secondary EUI64 source. this basically is for ATM PVC */ 411 if (altifp && in6_iid_from_hw(altifp, in6) == 0) { 412 nd6log((LOG_DEBUG, "%s: IID from alterate HW interface %s.\n", 413 if_name(ifp0), if_name(altifp))); 414 goto success; 415 } 416 417 /* next, try to get it from some other hardware interface */ 418 ifnet_head_lock_shared(); 419 TAILQ_FOREACH(ifp, &ifnet_head, if_list) { 420 if (ifp == ifp0) 421 continue; 422 if (in6_iid_from_hw(ifp, in6) != 0) 423 continue; 424 425 /* 426 * to borrow IID from other interface, IID needs to be 427 * globally unique 428 */ 429 if (ND6_IFID_UNIVERSAL(in6)) { 430 nd6log((LOG_DEBUG, "%s: borrowed IID from %s\n", 431 if_name(ifp0), if_name(ifp))); 432 ifnet_head_done(); 433 goto success; 434 } 435 } 436 ifnet_head_done(); 437 438 /* last resort: get from random number source */ 439 if (get_rand_iid(ifp, in6) == 0) { 440 nd6log((LOG_DEBUG, "%s: IID from PRNG.\n", if_name(ifp0))); 441 goto success; 442 } 443 444 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 445 return (-1); 446 447success: 448 nd6log((LOG_INFO, "%s: IID: " 449 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 450 if_name(ifp0), 451 in6->s6_addr[8], in6->s6_addr[9], 452 in6->s6_addr[10], in6->s6_addr[11], 453 in6->s6_addr[12], in6->s6_addr[13], 454 in6->s6_addr[14], in6->s6_addr[15])); 455 return (0); 456} 457 458static int 459in6_ifattach_linklocal(struct ifnet *ifp, struct in6_aliasreq *ifra) 460{ 461 struct in6_ifaddr *ia; 462 struct nd_prefix pr0, *pr; 463 int i, error; 464 465 VERIFY(ifra != NULL); 466 467 proto_plumb(PF_INET6, ifp); 468 469 error = in6_update_ifa(ifp, ifra, IN6_IFAUPDATE_DADDELAY, &ia); 470 if (error != 0) { 471 /* 472 * XXX: When the interface does not support IPv6, this call 473 * would fail in the SIOCSIFADDR ioctl. I believe the 474 * notification is rather confusing in this case, so just 475 * suppress it. (jinmei@kame.net 20010130) 476 */ 477 if (error != EAFNOSUPPORT) 478 nd6log((LOG_NOTICE, "%s: failed to " 479 "configure a link-local address on %s " 480 "(errno=%d)\n", 481 __func__, if_name(ifp), error)); 482 return (EADDRNOTAVAIL); 483 } 484 VERIFY(ia != NULL); 485 486 /* 487 * Make the link-local prefix (fe80::%link/64) as on-link. 488 * Since we'd like to manage prefixes separately from addresses, 489 * we make an ND6 prefix structure for the link-local prefix, 490 * and add it to the prefix list as a never-expire prefix. 491 * XXX: this change might affect some existing code base... 492 */ 493 bzero(&pr0, sizeof (pr0)); 494 lck_mtx_init(&pr0.ndpr_lock, ifa_mtx_grp, ifa_mtx_attr); 495 pr0.ndpr_ifp = ifp; 496 /* this should be 64 at this moment. */ 497 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, NULL); 498 pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr; 499 pr0.ndpr_prefix = ifra->ifra_addr; 500 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 501 for (i = 0; i < 4; i++) { 502 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 503 in6mask64.s6_addr32[i]; 504 } 505 /* 506 * Initialize parameters. The link-local prefix must always be 507 * on-link, and its lifetimes never expire. 508 */ 509 pr0.ndpr_raf_onlink = 1; 510 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 511 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 512 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 513 pr0.ndpr_stateflags |= NDPRF_STATIC; 514 /* 515 * Since there is no other link-local addresses, nd6_prefix_lookup() 516 * probably returns NULL. However, we cannot always expect the result. 517 * For example, if we first remove the (only) existing link-local 518 * address, and then reconfigure another one, the prefix is still 519 * valid with referring to the old link-local address. 520 */ 521 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 522 if ((error = nd6_prelist_add(&pr0, NULL, &pr, TRUE)) != 0) { 523 IFA_REMREF(&ia->ia_ifa); 524 lck_mtx_destroy(&pr0.ndpr_lock, ifa_mtx_grp); 525 return (error); 526 } 527 } 528 529 in6_post_msg(ifp, KEV_INET6_NEW_LL_ADDR, ia, NULL); 530 IFA_REMREF(&ia->ia_ifa); 531 532 /* Drop use count held above during lookup/add */ 533 if (pr != NULL) 534 NDPR_REMREF(pr); 535 536 lck_mtx_destroy(&pr0.ndpr_lock, ifa_mtx_grp); 537 return (0); 538} 539 540static int 541in6_ifattach_loopback( 542 struct ifnet *ifp) /* must be IFT_LOOP */ 543{ 544 struct in6_aliasreq ifra; 545 struct in6_ifaddr *ia; 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 strlcpy(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 /* add the new interface address */ 580 error = in6_update_ifa(ifp, &ifra, 0, &ia); 581 if (error != 0) { 582 nd6log((LOG_ERR, 583 "%s: failed to configure loopback address %s (error=%d)\n", 584 __func__, if_name(ifp), error)); 585 VERIFY(ia == NULL); 586 return (EADDRNOTAVAIL); 587 } 588 589 VERIFY(ia != NULL); 590 IFA_REMREF(&ia->ia_ifa); 591 return (0); 592} 593 594/* 595 * compute NI group address, based on the current hostname setting. 596 * see RFC 4620. 597 * 598 * when ifp == NULL, the caller is responsible for filling scopeid. 599 */ 600int 601in6_nigroup( 602 struct ifnet *ifp, 603 const char *name, 604 int namelen, 605 struct in6_addr *in6) 606{ 607 const char *p; 608 u_char *q; 609 SHA1_CTX ctxt; 610 u_int8_t digest[SHA1_RESULTLEN]; 611 char l; 612 char n[64]; /* a single label must not exceed 63 chars */ 613 614 if (!namelen || !name) 615 return (-1); 616 617 p = name; 618 while (p && *p && *p != '.' && p - name < namelen) 619 p++; 620 if (p - name > sizeof (n) - 1) 621 return (-1); /* label too long */ 622 l = p - name; 623 strlcpy(n, name, l); 624 n[(int)l] = '\0'; 625 for (q = (u_char *) n; *q; q++) { 626 if ('A' <= *q && *q <= 'Z') 627 *q = *q - 'A' + 'a'; 628 } 629 630 /* generate 16 bytes of pseudo-random value. */ 631 bzero(&ctxt, sizeof (ctxt)); 632 SHA1Init(&ctxt); 633 SHA1Update(&ctxt, &l, sizeof (l)); 634 SHA1Update(&ctxt, n, l); 635 SHA1Final(digest, &ctxt); 636 637 bzero(in6, sizeof (*in6)); 638 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 639 in6->s6_addr8[11] = 2; 640 in6->s6_addr8[12] = 0xff; 641 /* copy first 3 bytes of prefix into address */ 642 bcopy(digest, &in6->s6_addr8[13], 3); 643 if (in6_setscope(in6, ifp, NULL)) 644 return (-1); /* XXX: should not fail */ 645 646 return (0); 647} 648 649int 650in6_domifattach(struct ifnet *ifp) 651{ 652 int error; 653 654 VERIFY(ifp != NULL); 655 656 error = proto_plumb(PF_INET6, ifp); 657 if (error != 0) { 658 if (error != EEXIST) 659 log(LOG_ERR, "%s: proto_plumb returned %d if=%s\n", 660 __func__, error, if_name(ifp)); 661 } else { 662 error = in6_ifattach_prelim(ifp); 663 if (error != 0) { 664 int errorx; 665 666 log(LOG_ERR, 667 "%s: in6_ifattach_prelim returned %d if=%s%d\n", 668 __func__, error, ifp->if_name, ifp->if_unit); 669 670 errorx = proto_unplumb(PF_INET6, ifp); 671 if (errorx != 0) /* XXX should not fail */ 672 log(LOG_ERR, 673 "%s: proto_unplumb returned %d if=%s%d\n", 674 __func__, errorx, ifp->if_name, 675 ifp->if_unit); 676 } 677 } 678 679 return (error); 680} 681 682int 683in6_ifattach_prelim(struct ifnet *ifp) 684{ 685 struct in6_ifextra *ext; 686 void **pbuf, *base; 687 int error = 0; 688 689 VERIFY(ifp != NULL); 690 691 /* quirks based on interface type */ 692 switch (ifp->if_type) { 693#if IFT_STF 694 case IFT_STF: 695 /* 696 * 6to4 interface is a very special kind of beast. 697 * no multicast, no linklocal. RFC2529 specifies how to make 698 * linklocals for 6to4 interface, but there's no use and 699 * it is rather harmful to have one. 700 */ 701 goto skipmcast; 702#endif 703 default: 704 break; 705 } 706 707 /* 708 * IPv6 requires multicast capability at the interface. 709 * (previously, this was a silent error.) 710 */ 711 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 712 nd6log((LOG_INFO, "in6_ifattach: ", 713 "%s is not multicast capable, IPv6 not enabled\n", 714 if_name(ifp))); 715 return (EINVAL); 716 } 717 718#if IFT_STF 719skipmcast: 720#endif 721 722 if (ifp->if_inet6data == NULL) { 723 ext = (struct in6_ifextra *)_MALLOC(in6_extra_size, M_IFADDR, 724 M_WAITOK|M_ZERO); 725 if (!ext) 726 return (ENOMEM); 727 base = (void *)P2ROUNDUP((intptr_t)ext + sizeof(uint64_t), 728 sizeof(uint64_t)); 729 VERIFY(((intptr_t)base + in6_extra_size) <= 730 ((intptr_t)ext + in6_extra_bufsize)); 731 pbuf = (void **)((intptr_t)base - sizeof(void *)); 732 *pbuf = ext; 733 ifp->if_inet6data = base; 734 VERIFY(IS_P2ALIGNED(ifp->if_inet6data, sizeof(uint64_t))); 735 } else { 736 /* 737 * Since the structure is never freed, we need to zero out 738 * some of its members. We avoid zeroing out the scope6 739 * structure on purpose because other threads might be 740 * using its contents. 741 */ 742 bzero(&IN6_IFEXTRA(ifp)->icmp6_ifstat, 743 sizeof(IN6_IFEXTRA(ifp)->icmp6_ifstat)); 744 bzero(&IN6_IFEXTRA(ifp)->in6_ifstat, 745 sizeof(IN6_IFEXTRA(ifp)->in6_ifstat)); 746 } 747 748 /* initialize NDP variables */ 749 if ((error = nd6_ifattach(ifp)) != 0) 750 return (error); 751 752 scope6_ifattach(ifp); 753 754 /* initialize loopback interface address */ 755 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 756 error = in6_ifattach_loopback(ifp); 757 if (error != 0) { 758 log(LOG_ERR, "%s: in6_ifattach_loopback returned %d\n", 759 __func__, error, ifp->if_name, 760 ifp->if_unit); 761 return (error); 762 } 763 } 764 765 /* update dynamically. */ 766 if (in6_maxmtu < ifp->if_mtu) 767 in6_maxmtu = ifp->if_mtu; 768 769 VERIFY(error == 0); 770 return (0); 771} 772 773int 774in6_ifattach_aliasreq(struct ifnet *ifp, struct ifnet *altifp, 775 struct in6_aliasreq *ifra0) 776{ 777 int error; 778 struct in6_ifaddr *ia6; 779 struct in6_aliasreq ifra; 780 781 error = in6_ifattach_prelim(ifp); 782 if (error != 0) 783 return (error); 784 785 if (!ip6_auto_linklocal) 786 return (0); 787 788 /* assign a link-local address, only if there isn't one here already. */ 789 ia6 = in6ifa_ifpforlinklocal(ifp, 0); 790 if (ia6 != NULL) { 791 IFA_REMREF(&ia6->ia_ifa); 792 return (0); 793 } 794 795 bzero(&ifra, sizeof (ifra)); 796 797 /* 798 * in6_update_ifa() does not use ifra_name, but we accurately set it 799 * for safety. 800 */ 801 strlcpy(ifra.ifra_name, if_name(ifp), sizeof (ifra.ifra_name)); 802 803 /* Initialize the IPv6 interface address in our in6_aliasreq block */ 804 if ((ifp->if_eflags & IFEF_NOAUTOIPV6LL) != 0 && ifra0 != NULL) { 805 /* interface provided both addresses for us */ 806 struct sockaddr_in6 *sin6 = &ifra.ifra_addr; 807 struct in6_addr *in6 = &sin6->sin6_addr; 808 boolean_t ok = TRUE; 809 810 bcopy(&ifra0->ifra_addr, sin6, sizeof (struct sockaddr_in6)); 811 812 if (sin6->sin6_family != AF_INET6 || sin6->sin6_port != 0) 813 ok = FALSE; 814 if (ok && (in6->s6_addr16[0] != htons(0xfe80))) 815 ok = FALSE; 816 if (ok) { 817 if (sin6->sin6_scope_id == 0 && in6->s6_addr16[1] == 0) 818 in6->s6_addr16[1] = htons(ifp->if_index); 819 else if (sin6->sin6_scope_id != 0 && 820 sin6->sin6_scope_id != ifp->if_index) 821 ok = FALSE; 822 else if (in6->s6_addr16[1] != 0 && 823 ntohs(in6->s6_addr16[1]) != ifp->if_index) 824 ok = FALSE; 825 } 826 if (ok && (in6->s6_addr32[1] != 0)) 827 ok = FALSE; 828 if (!ok) 829 return (EINVAL); 830 } else { 831 ifra.ifra_addr.sin6_family = AF_INET6; 832 ifra.ifra_addr.sin6_len = sizeof (struct sockaddr_in6); 833 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 834 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 835 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 836 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 837 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 838 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 839 } else { 840 if (in6_select_iid_from_all_hw(ifp, altifp, 841 &ifra.ifra_addr.sin6_addr) != 0) { 842 nd6log((LOG_ERR, "%s: no IID available\n", 843 if_name(ifp))); 844 return (EADDRNOTAVAIL); 845 } 846 } 847 } 848 849 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 850 return (EADDRNOTAVAIL); 851 852 /* Set the prefix mask */ 853 ifra.ifra_prefixmask.sin6_len = sizeof (struct sockaddr_in6); 854 ifra.ifra_prefixmask.sin6_family = AF_INET6; 855 ifra.ifra_prefixmask.sin6_addr = in6mask64; 856 857 /* link-local addresses should NEVER expire. */ 858 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 859 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 860 861 /* Attach the link-local address */ 862 if (in6_ifattach_linklocal(ifp, &ifra) != 0) { 863 nd6log((LOG_INFO, 864 "%s: %s could not attach link-local address.\n", 865 __func__, if_name(ifp))); 866 /* NB: not an error */ 867 } 868 869 return (0); 870} 871 872int 873in6_ifattach_llstartreq(struct ifnet *ifp, struct in6_llstartreq *llsr) 874{ 875 struct in6_aliasreq ifra; 876 struct in6_ifaddr *ia6; 877 struct nd_ifinfo *ndi; 878 int error; 879 880 VERIFY(llsr != NULL); 881 882 error = in6_ifattach_prelim(ifp); 883 if (error != 0) 884 return (error); 885 886 if (!ip6_auto_linklocal || (ifp->if_eflags & IFEF_NOAUTOIPV6LL) != 0) 887 return (0); 888 889 if (nd6_send_opstate == ND6_SEND_OPMODE_DISABLED) 890 return (ENXIO); 891 892 lck_rw_lock_shared(nd_if_rwlock); 893 ndi = ND_IFINFO(ifp); 894 VERIFY(ndi != NULL && ndi->initialized); 895 if ((ndi->flags & ND6_IFF_INSECURE) != 0) { 896 lck_rw_done(nd_if_rwlock); 897 return (ENXIO); 898 } 899 lck_rw_done(nd_if_rwlock); 900 901 /* assign a link-local address, only if there isn't one here already. */ 902 ia6 = in6ifa_ifpforlinklocal(ifp, 0); 903 if (ia6 != NULL) { 904 IFA_REMREF(&ia6->ia_ifa); 905 return (0); 906 } 907 908 bzero(&ifra, sizeof (ifra)); 909 strlcpy(ifra.ifra_name, if_name(ifp), sizeof (ifra.ifra_name)); 910 911 ifra.ifra_addr.sin6_family = AF_INET6; 912 ifra.ifra_addr.sin6_len = sizeof (struct sockaddr_in6); 913 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 914 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 915 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 916 ifra.ifra_flags = IN6_IFF_SECURED; 917 918 in6_cga_node_lock(); 919 if (in6_cga_generate(&llsr->llsr_cgaprep, 0, 920 &ifra.ifra_addr.sin6_addr)) { 921 in6_cga_node_unlock(); 922 return (EADDRNOTAVAIL); 923 } 924 in6_cga_node_unlock(); 925 926 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 927 return (EADDRNOTAVAIL); 928 929 /* Set the prefix mask */ 930 ifra.ifra_prefixmask.sin6_len = sizeof (struct sockaddr_in6); 931 ifra.ifra_prefixmask.sin6_family = AF_INET6; 932 ifra.ifra_prefixmask.sin6_addr = in6mask64; 933 934 /* 935 * link-local addresses should NEVER expire, but cryptographic 936 * ones may have finite preferred lifetime [if it's important to 937 * keep them from being used by applications as persistent device 938 * identifiers]. 939 */ 940 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 941 ifra.ifra_lifetime.ia6t_pltime = llsr->llsr_lifetime.ia6t_pltime; 942 943 /* Attach the link-local address */ 944 if (in6_ifattach_linklocal(ifp, &ifra) != 0) { 945 /* NB: not an error */ 946 nd6log((LOG_INFO, 947 "%s: %s could not attach link-local address.\n", 948 __func__, if_name(ifp))); 949 } 950 951 VERIFY(error == 0); 952 return (error); 953} 954 955/* 956 * NOTE: in6_ifdetach() does not support loopback if at this moment. 957 */ 958void 959in6_ifdetach(struct ifnet *ifp) 960{ 961 struct in6_ifaddr *ia, *oia; 962 struct ifaddr *ifa; 963 struct rtentry *rt; 964 struct sockaddr_in6 sin6; 965 struct in6_multi_mship *imm; 966 int unlinked; 967 968 lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_NOTOWNED); 969 970 /* remove neighbor management table */ 971 nd6_purge(ifp); 972 973 /* nuke any of IPv6 addresses we have */ 974 lck_rw_lock_exclusive(&in6_ifaddr_rwlock); 975 ia = in6_ifaddrs; 976 while (ia != NULL) { 977 if (ia->ia_ifa.ifa_ifp != ifp) { 978 ia = ia->ia_next; 979 continue; 980 } 981 IFA_ADDREF(&ia->ia_ifa); /* for us */ 982 lck_rw_done(&in6_ifaddr_rwlock); 983 in6_purgeaddr(&ia->ia_ifa); 984 IFA_REMREF(&ia->ia_ifa); /* for us */ 985 lck_rw_lock_exclusive(&in6_ifaddr_rwlock); 986 /* 987 * Purging the address caused in6_ifaddr_rwlock 988 * to be dropped and reacquired; 989 * therefore search again from the beginning 990 * of in6_ifaddrs list. 991 */ 992 ia = in6_ifaddrs; 993 } 994 lck_rw_done(&in6_ifaddr_rwlock); 995 996 ifnet_lock_exclusive(ifp); 997 998 /* undo everything done by in6_ifattach(), just in case */ 999 ifa = TAILQ_FIRST(&ifp->if_addrlist); 1000 while (ifa != NULL) { 1001 IFA_LOCK(ifa); 1002 if (ifa->ifa_addr->sa_family != AF_INET6 || 1003 !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)-> 1004 sin6_addr)) { 1005 IFA_UNLOCK(ifa); 1006 ifa = TAILQ_NEXT(ifa, ifa_list); 1007 continue; 1008 } 1009 1010 ia = (struct in6_ifaddr *)ifa; 1011 1012 /* hold a reference for this routine */ 1013 IFA_ADDREF_LOCKED(ifa); 1014 /* remove from the linked list */ 1015 if_detach_ifa(ifp, ifa); 1016 IFA_UNLOCK(ifa); 1017 1018 /* 1019 * Leaving the multicast group(s) may involve freeing the 1020 * link address multicast structure(s) for the interface, 1021 * which is protected by ifnet lock. To avoid violating 1022 * lock ordering, we must drop ifnet lock before doing so. 1023 * The ifa won't go away since we held a refcnt above. 1024 */ 1025 ifnet_lock_done(ifp); 1026 1027 /* 1028 * We have to do this work manually here instead of calling 1029 * in6_purgeaddr() since in6_purgeaddr() uses the RTM_HOST flag. 1030 */ 1031 1032 /* 1033 * leave from multicast groups we have joined for the interface 1034 */ 1035 IFA_LOCK(ifa); 1036 while ((imm = ia->ia6_memberships.lh_first) != NULL) { 1037 LIST_REMOVE(imm, i6mm_chain); 1038 IFA_UNLOCK(ifa); 1039 in6_leavegroup(imm); 1040 IFA_LOCK(ifa); 1041 } 1042 1043 /* remove from the routing table */ 1044 if (ia->ia_flags & IFA_ROUTE) { 1045 IFA_UNLOCK(ifa); 1046 rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0); 1047 if (rt != NULL) { 1048 (void) rtrequest(RTM_DELETE, 1049 (struct sockaddr *)&ia->ia_addr, 1050 (struct sockaddr *)&ia->ia_addr, 1051 (struct sockaddr *)&ia->ia_prefixmask, 1052 rt->rt_flags, (struct rtentry **)0); 1053 rtfree(rt); 1054 } 1055 } else { 1056 IFA_UNLOCK(ifa); 1057 } 1058 1059 /* also remove from the IPv6 address chain(itojun&jinmei) */ 1060 unlinked = 1; 1061 oia = ia; 1062 lck_rw_lock_exclusive(&in6_ifaddr_rwlock); 1063 if (oia == (ia = in6_ifaddrs)) { 1064 in6_ifaddrs = ia->ia_next; 1065 } else { 1066 while (ia->ia_next && (ia->ia_next != oia)) 1067 ia = ia->ia_next; 1068 if (ia->ia_next) { 1069 ia->ia_next = oia->ia_next; 1070 } else { 1071 nd6log((LOG_ERR, 1072 "%s: didn't unlink in6ifaddr from " 1073 "list\n", if_name(ifp))); 1074 unlinked = 0; 1075 } 1076 } 1077 lck_rw_done(&in6_ifaddr_rwlock); 1078 1079 ifa = &oia->ia_ifa; 1080 /* 1081 * release another refcnt for the link from in6_ifaddrs. 1082 * Do this only if it's not already unlinked in the event 1083 * that we lost the race, since in6_ifaddr_rwlock was 1084 * momentarily dropped above. 1085 */ 1086 if (unlinked) 1087 IFA_REMREF(ifa); 1088 /* release reference held for this routine */ 1089 IFA_REMREF(ifa); 1090 1091 /* 1092 * This is suboptimal, but since we dropped ifnet lock above 1093 * the list might have changed. Repeat the search from the 1094 * beginning until we find the first eligible IPv6 address. 1095 */ 1096 ifnet_lock_exclusive(ifp); 1097 ifa = TAILQ_FIRST(&ifp->if_addrlist); 1098 } 1099 ifnet_lock_done(ifp); 1100 1101 /* invalidate route caches */ 1102 routegenid_inet6_update(); 1103 1104 /* 1105 * remove neighbor management table. we call it twice just to make 1106 * sure we nuke everything. maybe we need just one call. 1107 * XXX: since the first call did not release addresses, some prefixes 1108 * might remain. We should call nd6_purge() again to release the 1109 * prefixes after removing all addresses above. 1110 * (Or can we just delay calling nd6_purge until at this point?) 1111 */ 1112 nd6_purge(ifp); 1113 1114 /* remove route to link-local allnodes multicast (ff02::1) */ 1115 bzero(&sin6, sizeof (sin6)); 1116 sin6.sin6_len = sizeof (struct sockaddr_in6); 1117 sin6.sin6_family = AF_INET6; 1118 sin6.sin6_addr = in6addr_linklocal_allnodes; 1119 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1120 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0); 1121 if (rt != NULL) { 1122 RT_LOCK(rt); 1123 if (rt->rt_ifp == ifp) { 1124 /* 1125 * Prevent another thread from modifying rt_key, 1126 * rt_gateway via rt_setgate() after the rt_lock 1127 * is dropped by marking the route as defunct. 1128 */ 1129 rt->rt_flags |= RTF_CONDEMNED; 1130 RT_UNLOCK(rt); 1131 (void) rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1132 rt_mask(rt), rt->rt_flags, 0); 1133 } else { 1134 RT_UNLOCK(rt); 1135 } 1136 rtfree(rt); 1137 } 1138} 1139 1140void 1141in6_iid_mktmp(struct ifnet *ifp, u_int8_t *retbuf, const u_int8_t *baseid, 1142 int generate) 1143{ 1144 u_int8_t nullbuf[8]; 1145 struct nd_ifinfo *ndi; 1146 1147 lck_rw_lock_shared(nd_if_rwlock); 1148 ndi = ND_IFINFO(ifp); 1149 VERIFY(ndi != NULL && ndi->initialized); 1150 lck_mtx_lock(&ndi->lock); 1151 bzero(nullbuf, sizeof (nullbuf)); 1152 if (bcmp(ndi->randomid, nullbuf, sizeof (nullbuf)) == 0) { 1153 /* we've never created a random ID. Create a new one. */ 1154 generate = 1; 1155 } 1156 1157 if (generate) { 1158 bcopy(baseid, ndi->randomseed1, sizeof (ndi->randomseed1)); 1159 1160 /* in6_generate_tmp_iid will update seedn and buf */ 1161 (void) in6_generate_tmp_iid(ndi->randomseed0, ndi->randomseed1, 1162 ndi->randomid); 1163 } 1164 1165 bcopy(ndi->randomid, retbuf, 8); 1166 lck_mtx_unlock(&ndi->lock); 1167 lck_rw_done(nd_if_rwlock); 1168} 1169 1170void 1171in6_tmpaddrtimer(void *arg) 1172{ 1173#pragma unused(arg) 1174 int i; 1175 struct nd_ifinfo *ndi; 1176 u_int8_t nullbuf[8]; 1177 1178 timeout(in6_tmpaddrtimer, (caddr_t)0, (ip6_temp_preferred_lifetime - 1179 ip6_desync_factor - ip6_temp_regen_advance) * hz); 1180 1181 lck_rw_lock_shared(nd_if_rwlock); 1182 bzero(nullbuf, sizeof (nullbuf)); 1183 for (i = 1; i < if_index + 1; i++) { 1184 if (!nd_ifinfo || i >= nd_ifinfo_indexlim) 1185 break; 1186 ndi = &nd_ifinfo[i]; 1187 if (!ndi->initialized) 1188 continue; 1189 lck_mtx_lock(&ndi->lock); 1190 if (bcmp(ndi->randomid, nullbuf, sizeof (nullbuf)) != 0) { 1191 /* 1192 * We've been generating a random ID on this interface. 1193 * Create a new one. 1194 */ 1195 (void) in6_generate_tmp_iid(ndi->randomseed0, 1196 ndi->randomseed1, ndi->randomid); 1197 } 1198 lck_mtx_unlock(&ndi->lock); 1199 } 1200 lck_rw_done(nd_if_rwlock); 1201} 1202