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sys/bsd/netinet6/in6_ifattach.c
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1 /* 2 * Copyright (c) 2003-2011 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/md5.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 struct in6_ifstat **in6_ifstat = NULL; 96 struct icmp6_ifstat **icmp6_ifstat = NULL; 97 size_t in6_ifstatmax = 0; 98 size_t icmp6_ifstatmax = 0; 99 u_int32_t in6_maxmtu = 0; 100 extern lck_mtx_t *nd6_mutex; 101 102 #if IP6_AUTO_LINKLOCAL 103 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; 104 #else 105 int ip6_auto_linklocal = 1; /* enable by default */ 106 #endif 107 108 int loopattach6_done = 0; 109 110 extern struct inpcbinfo udbinfo; 111 extern struct inpcbinfo ripcbinfo; 112 113 static int get_rand_ifid(struct ifnet *, struct in6_addr *); 114 static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 115 int in6_get_hw_ifid(struct ifnet *, struct in6_addr *); 116 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 117 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *, struct in6_aliasreq *); 118 static int in6_ifattach_loopback(struct ifnet *); 119 120 #define EUI64_GBIT 0x01 121 #define EUI64_UBIT 0x02 122 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 123 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 124 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 125 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 126 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 127 128 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 129 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 130 131 /* 132 * Generate a last-resort interface identifier, when the machine has no 133 * IEEE802/EUI64 address sources. 134 * The goal here is to get an interface identifier that is 135 * (1) random enough and (2) does not change across reboot. 136 * We currently use MD5(hostname) for it. 137 * 138 * in6 - upper 64bits are preserved 139 */ 140 static int 141 get_rand_ifid( 142 __unused struct ifnet *ifp, 143 struct in6_addr *in6) /* upper 64bits are preserved */ 144 { 145 MD5_CTX ctxt; 146 u_int8_t digest[16]; 147 int hostnlen = strlen(hostname); 148 149 #if 0 150 /* we need at least several letters as seed for ifid */ 151 if (len < 3) 152 return -1; 153 #endif 154 155 /* generate 8 bytes of pseudo-random value. */ 156 bzero(&ctxt, sizeof(ctxt)); 157 MD5Init(&ctxt); 158 MD5Update(&ctxt, hostname, hostnlen); 159 MD5Final(digest, &ctxt); 160 161 /* assumes sizeof(digest) > sizeof(ifid) */ 162 bcopy(digest, &in6->s6_addr[8], 8); 163 164 /* make sure to set "u" bit to local, and "g" bit to individual. */ 165 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 166 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 167 168 /* convert EUI64 into IPv6 interface identifier */ 169 EUI64_TO_IFID(in6); 170 171 return 0; 172 } 173 174 static int 175 generate_tmp_ifid( 176 u_int8_t *seed0, 177 const u_int8_t *seed1, 178 u_int8_t *ret) 179 { 180 MD5_CTX ctxt; 181 u_int8_t seed[16], digest[16], nullbuf[8]; 182 u_int32_t val32; 183 struct timeval tv; 184 185 /* If there's no history, start with a random seed. */ 186 bzero(nullbuf, sizeof(nullbuf)); 187 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 188 int i; 189 190 for (i = 0; i < 2; i++) { 191 microtime(&tv); 192 val32 = random() ^ tv.tv_usec; 193 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 194 } 195 } else { 196 bcopy(seed0, seed, 8); 197 } 198 199 /* copy the right-most 64-bits of the given address */ 200 /* XXX assumption on the size of IFID */ 201 bcopy(seed1, &seed[8], 8); 202 203 if (0) { /* for debugging purposes only */ 204 int i; 205 206 printf("generate_tmp_ifid: new randomized ID from: "); 207 for (i = 0; i < 16; i++) 208 printf("%02x", seed[i]); 209 printf(" "); 210 } 211 212 /* generate 16 bytes of pseudo-random value. */ 213 bzero(&ctxt, sizeof(ctxt)); 214 MD5Init(&ctxt); 215 MD5Update(&ctxt, seed, sizeof(seed)); 216 MD5Final(digest, &ctxt); 217 218 /* 219 * RFC 4941 3.2.1. (3) 220 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 221 * left-most bit is numbered 0) to zero. 222 */ 223 bcopy(digest, ret, 8); 224 ret[0] &= ~EUI64_UBIT; 225 226 /* 227 * XXX: we'd like to ensure that the generated value is not zero 228 * for simplicity. If the caclculated digest happens to be zero, 229 * use a random non-zero value as the last resort. 230 */ 231 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 232 nd6log((LOG_INFO, 233 "generate_tmp_ifid: computed MD5 value is zero.\n")); 234 235 microtime(&tv); 236 val32 = random() ^ tv.tv_usec; 237 val32 = 1 + (val32 % (0xffffffff - 1)); 238 } 239 240 /* 241 * RFC 4941 3.2.1. (4) 242 * Take the rightmost 64-bits of the MD5 digest and save them in 243 * stable storage as the history value to be used in the next 244 * iteration of the algorithm. 245 */ 246 bcopy(&digest[8], seed0, 8); 247 248 if (0) { /* for debugging purposes only */ 249 int i; 250 251 printf("to: "); 252 for (i = 0; i < 16; i++) 253 printf("%02x", digest[i]); 254 printf("\n"); 255 } 256 257 return 0; 258 } 259 260 /* 261 * Get interface identifier for the specified interface. 262 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 263 * 264 * in6 - upper 64bits are preserved 265 */ 266 int 267 in6_get_hw_ifid( 268 struct ifnet *ifp, 269 struct in6_addr *in6) /* upper 64bits are preserved */ 270 { 271 struct ifaddr *ifa = NULL; 272 struct sockaddr_dl *sdl; 273 u_int8_t *addr; 274 size_t addrlen; 275 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 276 static u_int8_t allone[8] = 277 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 278 int err = -1; 279 280 /* Why doesn't this code use ifnet_addrs? */ 281 ifnet_lock_shared(ifp); 282 ifa = ifp->if_lladdr; 283 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 284 if (sdl->sdl_alen == 0) { 285 ifnet_lock_done(ifp); 286 return (-1); 287 } 288 IFA_ADDREF(ifa); /* for this routine */ 289 ifnet_lock_done(ifp); 290 291 IFA_LOCK(ifa); 292 addr = (u_int8_t *) LLADDR(sdl); 293 addrlen = sdl->sdl_alen; 294 295 /* get EUI64 */ 296 switch (ifp->if_type) { 297 case IFT_ETHER: 298 case IFT_FDDI: 299 case IFT_ISO88025: 300 case IFT_ATM: 301 case IFT_IEEE1394: 302 case IFT_L2VLAN: 303 case IFT_IEEE8023ADLAG: 304 #if IFT_IEEE80211 305 case IFT_IEEE80211: 306 #endif 307 case IFT_BRIDGE: 308 /* IEEE802/EUI64 cases - what others? */ 309 /* IEEE1394 uses 16byte length address starting with EUI64 */ 310 if (addrlen > 8) 311 addrlen = 8; 312 313 /* look at IEEE802/EUI64 only */ 314 if (addrlen != 8 && addrlen != 6) 315 goto done; 316 317 /* 318 * check for invalid MAC address - on bsdi, we see it a lot 319 * since wildboar configures all-zero MAC on pccard before 320 * card insertion. 321 */ 322 if (bcmp(addr, allzero, addrlen) == 0) 323 goto done; 324 if (bcmp(addr, allone, addrlen) == 0) 325 goto done; 326 327 /* make EUI64 address */ 328 if (addrlen == 8) 329 bcopy(addr, &in6->s6_addr[8], 8); 330 else if (addrlen == 6) { 331 in6->s6_addr[8] = addr[0]; 332 in6->s6_addr[9] = addr[1]; 333 in6->s6_addr[10] = addr[2]; 334 in6->s6_addr[11] = 0xff; 335 in6->s6_addr[12] = 0xfe; 336 in6->s6_addr[13] = addr[3]; 337 in6->s6_addr[14] = addr[4]; 338 in6->s6_addr[15] = addr[5]; 339 } 340 break; 341 342 case IFT_ARCNET: 343 if (addrlen != 1) 344 goto done; 345 if (!addr[0]) 346 goto done; 347 348 bzero(&in6->s6_addr[8], 8); 349 in6->s6_addr[15] = addr[0]; 350 351 /* 352 * due to insufficient bitwidth, we mark it local. 353 */ 354 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 355 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 356 break; 357 358 case IFT_GIF: 359 #if IFT_STF 360 case IFT_STF: 361 #endif 362 /* 363 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 364 * however, IPv4 address is not very suitable as unique 365 * identifier source (can be renumbered). 366 * we don't do this. 367 */ 368 goto done; 369 370 case IFT_CELLULAR: 371 goto done; 372 373 default: 374 goto done; 375 } 376 377 /* sanity check: g bit must not indicate "group" */ 378 if (EUI64_GROUP(in6)) 379 goto done; 380 381 /* convert EUI64 into IPv6 interface identifier */ 382 EUI64_TO_IFID(in6); 383 384 /* 385 * sanity check: ifid must not be all zero, avoid conflict with 386 * subnet router anycast 387 */ 388 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 389 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 390 goto done; 391 } 392 393 err = 0; /* found */ 394 395 done: 396 /* This must not be the last reference to the lladdr */ 397 if (IFA_REMREF_LOCKED(ifa) == NULL) { 398 panic("%s: unexpected (missing) refcnt ifa=%p", __func__, ifa); 399 /* NOTREACHED */ 400 } 401 IFA_UNLOCK(ifa); 402 return (err); 403 } 404 405 /* 406 * Get interface identifier for the specified interface. If it is not 407 * available on ifp0, borrow interface identifier from other information 408 * sources. 409 * 410 * altifp - secondary EUI64 source 411 */ 412 static int 413 get_ifid( 414 struct ifnet *ifp0, 415 struct ifnet *altifp, /* secondary EUI64 source */ 416 struct in6_addr *in6) 417 { 418 struct ifnet *ifp; 419 420 /* first, try to get it from the interface itself */ 421 if (in6_get_hw_ifid(ifp0, in6) == 0) { 422 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 423 if_name(ifp0))); 424 goto success; 425 } 426 427 /* try secondary EUI64 source. this basically is for ATM PVC */ 428 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 429 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 430 if_name(ifp0), if_name(altifp))); 431 goto success; 432 } 433 434 /* next, try to get it from some other hardware interface */ 435 ifnet_head_lock_shared(); 436 TAILQ_FOREACH(ifp, &ifnet_head, if_list) { 437 if (ifp == ifp0) 438 continue; 439 if (in6_get_hw_ifid(ifp, in6) != 0) 440 continue; 441 442 /* 443 * to borrow ifid from other interface, ifid needs to be 444 * globally unique 445 */ 446 if (IFID_UNIVERSAL(in6)) { 447 nd6log((LOG_DEBUG, 448 "%s: borrow interface identifier from %s\n", 449 if_name(ifp0), if_name(ifp))); 450 ifnet_head_done(); 451 goto success; 452 } 453 } 454 ifnet_head_done(); 455 456 /* last resort: get from random number source */ 457 if (get_rand_ifid(ifp, in6) == 0) { 458 nd6log((LOG_DEBUG, 459 "%s: interface identifier generated by random number\n", 460 if_name(ifp0))); 461 goto success; 462 } 463 464 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 465 return -1; 466 467 success: 468 nd6log((LOG_INFO, "%s: ifid: " 469 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 470 if_name(ifp0), 471 in6->s6_addr[8], in6->s6_addr[9], 472 in6->s6_addr[10], in6->s6_addr[11], 473 in6->s6_addr[12], in6->s6_addr[13], 474 in6->s6_addr[14], in6->s6_addr[15])); 475 return 0; 476 } 477 478 static int 479 in6_ifattach_linklocal( 480 struct ifnet *ifp, 481 struct ifnet *altifp, /* secondary EUI64 source */ 482 struct in6_aliasreq *ifra_passed) 483 { 484 struct in6_ifaddr *ia; 485 struct in6_aliasreq ifra; 486 struct nd_prefix pr0, *pr; 487 int i, error; 488 489 /* 490 * configure link-local address. 491 */ 492 bzero(&ifra, sizeof(ifra)); 493 494 proto_plumb(PF_INET6, ifp); 495 496 /* 497 * in6_update_ifa() does not use ifra_name, but we accurately set it 498 * for safety. 499 */ 500 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 501 502 if ((ifp->if_eflags & IFEF_NOAUTOIPV6LL) != 0 && 503 ifra_passed != NULL) /* interface provided both addresses for us */ 504 bcopy(&ifra_passed->ifra_addr, &(ifra.ifra_addr), sizeof(struct sockaddr_in6)); 505 else { 506 ifra.ifra_addr.sin6_family = AF_INET6; 507 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 508 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 509 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 510 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 511 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 512 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 513 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 514 } else { 515 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 516 nd6log((LOG_ERR, 517 " %s: no ifid available\n", if_name(ifp))); 518 return EADDRNOTAVAIL; 519 } 520 } 521 } 522 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 523 return (EADDRNOTAVAIL); 524 525 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 526 ifra.ifra_prefixmask.sin6_family = AF_INET6; 527 ifra.ifra_prefixmask.sin6_addr = in6mask64; 528 /* link-local addresses should NEVER expire. */ 529 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 530 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 531 532 /* 533 * Now call in6_update_ifa() to do a bunch of procedures to configure 534 * a link-local address. We can set the 3rd argument to NULL, because 535 * we know there's no other link-local address on the interface 536 * and therefore we are adding one (instead of updating one). 537 */ 538 if ((error = in6_update_ifa(ifp, &ifra, NULL, 539 IN6_IFAUPDATE_DADDELAY, M_WAITOK)) != 0) { 540 /* 541 * XXX: When the interface does not support IPv6, this call 542 * would fail in the SIOCSIFADDR ioctl. I believe the 543 * notification is rather confusing in this case, so just 544 * suppress it. (jinmei@kame.net 20010130) 545 */ 546 if (error != EAFNOSUPPORT) 547 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 548 "configure a link-local address on %s " 549 "(errno=%d)\n", 550 if_name(ifp), error)); 551 return (EADDRNOTAVAIL); 552 } 553 554 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 555 #if DIAGNOSTIC 556 if (!ia) { 557 panic("ia == NULL in in6_ifattach_linklocal"); 558 /*NOTREACHED*/ 559 } 560 #endif 561 /* 562 * Make the link-local prefix (fe80::%link/64) as on-link. 563 * Since we'd like to manage prefixes separately from addresses, 564 * we make an ND6 prefix structure for the link-local prefix, 565 * and add it to the prefix list as a never-expire prefix. 566 * XXX: this change might affect some existing code base... 567 */ 568 bzero(&pr0, sizeof(pr0)); 569 lck_mtx_init(&pr0.ndpr_lock, ifa_mtx_grp, ifa_mtx_attr); 570 pr0.ndpr_ifp = ifp; 571 /* this should be 64 at this moment. */ 572 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 573 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 574 pr0.ndpr_prefix = ifra.ifra_addr; 575 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 576 for (i = 0; i < 4; i++) { 577 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 578 in6mask64.s6_addr32[i]; 579 } 580 /* 581 * Initialize parameters. The link-local prefix must always be 582 * on-link, and its lifetimes never expire. 583 */ 584 pr0.ndpr_raf_onlink = 1; 585 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 586 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 587 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 588 pr0.ndpr_stateflags |= NDPRF_STATIC; 589 /* 590 * Since there is no other link-local addresses, nd6_prefix_lookup() 591 * probably returns NULL. However, we cannot always expect the result. 592 * For example, if we first remove the (only) existing link-local 593 * address, and then reconfigure another one, the prefix is still 594 * valid with referring to the old link-local address. 595 */ 596 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 597 if ((error = nd6_prelist_add(&pr0, NULL, &pr, TRUE)) != 0) { 598 IFA_REMREF(&ia->ia_ifa); 599 lck_mtx_destroy(&pr0.ndpr_lock, ifa_mtx_grp); 600 return(error); 601 } 602 } 603 604 if (ia != NULL) { 605 in6_post_msg(ifp, KEV_INET6_NEW_LL_ADDR, ia); 606 IFA_REMREF(&ia->ia_ifa); 607 } 608 609 /* Drop use count held above during lookup/add */ 610 if (pr != NULL) 611 NDPR_REMREF(pr); 612 613 lck_mtx_destroy(&pr0.ndpr_lock, ifa_mtx_grp); 614 615 return 0; 616 } 617 618 static int 619 in6_ifattach_loopback( 620 struct ifnet *ifp) /* must be IFT_LOOP */ 621 { 622 struct in6_aliasreq ifra; 623 int error; 624 625 bzero(&ifra, sizeof(ifra)); 626 627 /* 628 * in6_update_ifa() does not use ifra_name, but we accurately set it 629 * for safety. 630 */ 631 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 632 633 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 634 ifra.ifra_prefixmask.sin6_family = AF_INET6; 635 ifra.ifra_prefixmask.sin6_addr = in6mask128; 636 637 /* 638 * Always initialize ia_dstaddr (= broadcast address) to loopback 639 * address. Follows IPv4 practice - see in_ifinit(). 640 */ 641 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 642 ifra.ifra_dstaddr.sin6_family = AF_INET6; 643 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 644 645 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 646 ifra.ifra_addr.sin6_family = AF_INET6; 647 ifra.ifra_addr.sin6_addr = in6addr_loopback; 648 649 /* the loopback address should NEVER expire. */ 650 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 651 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 652 653 /* we don't need to perform DAD on loopback interfaces. */ 654 ifra.ifra_flags |= IN6_IFF_NODAD; 655 656 /* skip registration to the prefix list. XXX should be temporary. */ 657 ifra.ifra_flags |= IN6_IFF_NOPFX; 658 659 /* 660 * We are sure that this is a newly assigned address, so we can set 661 * NULL to the 3rd arg. 662 */ 663 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0, M_WAITOK)) != 0) { 664 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 665 "the loopback address on %s (errno=%d)\n", 666 if_name(ifp), error)); 667 return (EADDRNOTAVAIL); 668 } 669 670 return 0; 671 } 672 673 /* 674 * compute NI group address, based on the current hostname setting. 675 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 676 * 677 * when ifp == NULL, the caller is responsible for filling scopeid. 678 */ 679 int 680 in6_nigroup( 681 struct ifnet *ifp, 682 const char *name, 683 int namelen, 684 struct in6_addr *in6) 685 { 686 const char *p; 687 u_char *q; 688 MD5_CTX ctxt; 689 u_int8_t digest[16]; 690 char l; 691 char n[64]; /* a single label must not exceed 63 chars */ 692 693 if (!namelen || !name) 694 return -1; 695 696 p = name; 697 while (p && *p && *p != '.' && p - name < namelen) 698 p++; 699 if (p - name > sizeof(n) - 1) 700 return -1; /* label too long */ 701 l = p - name; 702 strncpy(n, name, l); 703 n[(int)l] = '\0'; 704 for (q = (u_char *) n; *q; q++) { 705 if ('A' <= *q && *q <= 'Z') 706 *q = *q - 'A' + 'a'; 707 } 708 709 /* generate 8 bytes of pseudo-random value. */ 710 bzero(&ctxt, sizeof(ctxt)); 711 MD5Init(&ctxt); 712 MD5Update(&ctxt, &l, sizeof(l)); 713 MD5Update(&ctxt, n, l); 714 MD5Final(digest, &ctxt); 715 716 bzero(in6, sizeof(*in6)); 717 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 718 in6->s6_addr8[11] = 2; 719 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 720 if (in6_setscope(in6, ifp, NULL)) 721 return (-1); /* XXX: should not fail */ 722 723 return 0; 724 } 725 726 int 727 in6_domifattach(struct ifnet *ifp) 728 { 729 int error = 0; 730 731 if ((error = proto_plumb(PF_INET6, ifp))) { 732 if (error != EEXIST) 733 log(LOG_ERR, "%s: proto_plumb returned %d if=%s%d\n", 734 __func__, error, ifp->if_name, ifp->if_unit); 735 } else { 736 nd6_ifattach(ifp); 737 scope6_ifattach(ifp); 738 } 739 740 return (error); 741 } 742 743 744 /* 745 * XXX multiple loopback interface needs more care. for instance, 746 * nodelocal address needs to be configured onto only one of them. 747 * XXX multiple link-local address case 748 */ 749 int 750 in6_ifattach( 751 struct ifnet *ifp, 752 struct ifnet *altifp, /* secondary EUI64 source */ 753 struct in6_aliasreq *ifra) 754 { 755 static size_t if_indexlim = 8; 756 struct in6_ifaddr *ia; 757 struct in6_addr in6; 758 int error; 759 760 lck_rw_lock_exclusive(&in6_ifs_rwlock); 761 /* 762 * We have some arrays that should be indexed by if_index. 763 * since if_index will grow dynamically, they should grow too. 764 * struct in6_ifstat **in6_ifstat 765 * struct icmp6_ifstat **icmp6_ifstat 766 */ 767 if (in6_ifstat == NULL || icmp6_ifstat == NULL || 768 if_index >= if_indexlim) { 769 while (if_index >= if_indexlim) 770 if_indexlim <<= 1; 771 } 772 773 /* grow in6_ifstat */ 774 if (in6_ifstatmax < if_indexlim) { 775 size_t n; 776 caddr_t q; 777 778 n = if_indexlim * sizeof(struct in6_ifstat *); 779 q = (caddr_t)_MALLOC(n, M_IFADDR, M_WAITOK); 780 if (q == NULL) { 781 lck_rw_done(&in6_ifs_rwlock); 782 return ENOBUFS; 783 } 784 bzero(q, n); 785 if (in6_ifstat) { 786 bcopy((caddr_t)in6_ifstat, q, 787 in6_ifstatmax * sizeof(struct in6_ifstat *)); 788 FREE((caddr_t)in6_ifstat, M_IFADDR); 789 } 790 in6_ifstat = (struct in6_ifstat **)q; 791 in6_ifstatmax = if_indexlim; 792 } 793 794 if (in6_ifstat[ifp->if_index] == NULL) { 795 in6_ifstat[ifp->if_index] = (struct in6_ifstat *) 796 _MALLOC(sizeof(struct in6_ifstat), M_IFADDR, M_WAITOK); 797 if (in6_ifstat[ifp->if_index] == NULL) { 798 lck_rw_done(&in6_ifs_rwlock); 799 return ENOBUFS; 800 } 801 bzero(in6_ifstat[ifp->if_index], sizeof(struct in6_ifstat)); 802 } 803 lck_rw_done(&in6_ifs_rwlock); 804 805 lck_rw_lock_exclusive(&icmp6_ifs_rwlock); 806 if (icmp6_ifstatmax < if_indexlim) { 807 size_t n; 808 caddr_t q; 809 810 n = if_indexlim * sizeof(struct icmp6_ifstat *); 811 q = (caddr_t)_MALLOC(n, M_IFADDR, M_WAITOK); 812 if (q == NULL) { 813 lck_rw_done(&icmp6_ifs_rwlock); 814 return ENOBUFS; 815 } 816 bzero(q, n); 817 if (icmp6_ifstat) { 818 bcopy((caddr_t)icmp6_ifstat, q, 819 icmp6_ifstatmax * sizeof(struct icmp6_ifstat *)); 820 FREE((caddr_t)icmp6_ifstat, M_IFADDR); 821 } 822 icmp6_ifstat = (struct icmp6_ifstat **)q; 823 icmp6_ifstatmax = if_indexlim; 824 } 825 826 if (icmp6_ifstat[ifp->if_index] == NULL) { 827 icmp6_ifstat[ifp->if_index] = (struct icmp6_ifstat *) 828 _MALLOC(sizeof(struct icmp6_ifstat), M_IFADDR, M_WAITOK); 829 if (icmp6_ifstat[ifp->if_index] == NULL) { 830 lck_rw_done(&icmp6_ifs_rwlock); 831 return ENOBUFS; 832 } 833 bzero(icmp6_ifstat[ifp->if_index], sizeof(struct icmp6_ifstat)); 834 } 835 lck_rw_done(&icmp6_ifs_rwlock); 836 837 /* initialize NDP variables */ 838 if ((error = nd6_ifattach(ifp)) != 0) 839 return error; 840 841 /* initialize scope identifiers */ 842 if ((error = scope6_ifattach(ifp)) != 0) 843 return error; 844 845 /* 846 * quirks based on interface type 847 */ 848 switch (ifp->if_type) { 849 #if IFT_STF 850 case IFT_STF: 851 /* 852 * 6to4 interface is a very special kind of beast. 853 * no multicast, no linklocal. RFC2529 specifies how to make 854 * linklocals for 6to4 interface, but there's no use and 855 * it is rather harmful to have one. 856 */ 857 goto statinit; 858 #endif 859 default: 860 break; 861 } 862 863 /* 864 * usually, we require multicast capability to the interface 865 */ 866 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 867 nd6log((LOG_INFO, "in6_ifattach: ", 868 "%s is not multicast capable, IPv6 not enabled\n", 869 if_name(ifp))); 870 return EINVAL; 871 } 872 873 /* 874 * assign loopback address for loopback interface. 875 * XXX multiple loopback interface case. 876 */ 877 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 878 struct in6_ifaddr *ia6 = NULL; 879 if (!OSCompareAndSwap(0, 1, (UInt32 *)&loopattach6_done)) { 880 in6 = in6addr_loopback; 881 if ((ia6 = in6ifa_ifpwithaddr(ifp, &in6)) == NULL) { 882 if (in6_ifattach_loopback(ifp) != 0) { 883 OSCompareAndSwap(1, 0, (UInt32 *)&loopattach6_done); 884 return EINVAL; 885 } 886 } 887 else { 888 IFA_REMREF(&ia6->ia_ifa); 889 } 890 } 891 } 892 893 /* 894 * assign a link-local address, if there's none. 895 */ 896 if (ip6_auto_linklocal) { 897 ia = in6ifa_ifpforlinklocal(ifp, 0); 898 if (ia == NULL) { 899 if (in6_ifattach_linklocal(ifp, altifp, ifra) == 0) { 900 /* linklocal address assigned */ 901 } else { 902 nd6log((LOG_INFO, "in6_ifattach: %s failed to " 903 "attach a linklocal address.\n", 904 if_name(ifp))); 905 /* failed to assign linklocal address. bark? */ 906 } 907 } else { 908 IFA_REMREF(&ia->ia_ifa); 909 } 910 } 911 912 #if IFT_STF /* XXX */ 913 statinit: 914 #endif 915 916 /* update dynamically. */ 917 if (in6_maxmtu < ifp->if_mtu) 918 in6_maxmtu = ifp->if_mtu; 919 920 return 0; 921 } 922 923 /* 924 * NOTE: in6_ifdetach() does not support loopback if at this moment. 925 */ 926 void 927 in6_ifdetach(struct ifnet *ifp) 928 { 929 struct in6_ifaddr *ia, *oia; 930 struct ifaddr *ifa; 931 struct rtentry *rt; 932 struct sockaddr_in6 sin6; 933 struct in6_multi_mship *imm; 934 int unlinked; 935 936 lck_mtx_assert(nd6_mutex, LCK_MTX_ASSERT_NOTOWNED); 937 938 /* remove neighbor management table */ 939 nd6_purge(ifp); 940 941 /* nuke any of IPv6 addresses we have */ 942 lck_rw_lock_exclusive(&in6_ifaddr_rwlock); 943 ia = in6_ifaddrs; 944 while (ia != NULL) { 945 if (ia->ia_ifa.ifa_ifp != ifp) { 946 ia = ia->ia_next; 947 continue; 948 } 949 IFA_ADDREF(&ia->ia_ifa); /* for us */ 950 lck_rw_done(&in6_ifaddr_rwlock); 951 in6_purgeaddr(&ia->ia_ifa); 952 IFA_REMREF(&ia->ia_ifa); /* for us */ 953 lck_rw_lock_exclusive(&in6_ifaddr_rwlock); 954 /* 955 * Purging the address caused in6_ifaddr_rwlock 956 * to be dropped and reacquired; 957 * therefore search again from the beginning 958 * of in6_ifaddrs list. 959 */ 960 ia = in6_ifaddrs; 961 } 962 lck_rw_done(&in6_ifaddr_rwlock); 963 964 ifnet_lock_exclusive(ifp); 965 966 /* undo everything done by in6_ifattach(), just in case */ 967 ifa = TAILQ_FIRST(&ifp->if_addrlist); 968 while (ifa != NULL) { 969 IFA_LOCK(ifa); 970 if (ifa->ifa_addr->sa_family != AF_INET6 || 971 !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)-> 972 sin6_addr)) { 973 IFA_UNLOCK(ifa); 974 ifa = TAILQ_NEXT(ifa, ifa_list); 975 continue; 976 } 977 978 ia = (struct in6_ifaddr *)ifa; 979 980 /* hold a reference for this routine */ 981 IFA_ADDREF_LOCKED(ifa); 982 /* remove from the linked list */ 983 if_detach_ifa(ifp, ifa); 984 IFA_UNLOCK(ifa); 985 986 /* 987 * Leaving the multicast group(s) may involve freeing the 988 * link address multicast structure(s) for the interface, 989 * which is protected by ifnet lock. To avoid violating 990 * lock ordering, we must drop ifnet lock before doing so. 991 * The ifa won't go away since we held a refcnt above. 992 */ 993 ifnet_lock_done(ifp); 994 995 /* 996 * We have to do this work manually here instead of calling 997 * in6_purgeaddr() since in6_purgeaddr() uses the RTM_HOST flag. 998 */ 999 1000 /* 1001 * leave from multicast groups we have joined for the interface 1002 */ 1003 IFA_LOCK(ifa); 1004 while ((imm = ia->ia6_memberships.lh_first) != NULL) { 1005 LIST_REMOVE(imm, i6mm_chain); 1006 IFA_UNLOCK(ifa); 1007 in6_leavegroup(imm); 1008 IFA_LOCK(ifa); 1009 } 1010 1011 /* remove from the routing table */ 1012 if (ia->ia_flags & IFA_ROUTE) { 1013 IFA_UNLOCK(ifa); 1014 rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0); 1015 if (rt != NULL) { 1016 (void) rtrequest(RTM_DELETE, 1017 (struct sockaddr *)&ia->ia_addr, 1018 (struct sockaddr *)&ia->ia_addr, 1019 (struct sockaddr *)&ia->ia_prefixmask, 1020 rt->rt_flags, (struct rtentry **)0); 1021 rtfree(rt); 1022 } 1023 } else { 1024 IFA_UNLOCK(ifa); 1025 } 1026 1027 /* also remove from the IPv6 address chain(itojun&jinmei) */ 1028 unlinked = 1; 1029 oia = ia; 1030 lck_rw_lock_exclusive(&in6_ifaddr_rwlock); 1031 if (oia == (ia = in6_ifaddrs)) { 1032 in6_ifaddrs = ia->ia_next; 1033 } else { 1034 while (ia->ia_next && (ia->ia_next != oia)) 1035 ia = ia->ia_next; 1036 if (ia->ia_next) { 1037 ia->ia_next = oia->ia_next; 1038 } else { 1039 nd6log((LOG_ERR, 1040 "%s: didn't unlink in6ifaddr from " 1041 "list\n", if_name(ifp))); 1042 unlinked = 0; 1043 } 1044 } 1045 lck_rw_done(&in6_ifaddr_rwlock); 1046 1047 ifa = &oia->ia_ifa; 1048 /* 1049 * release another refcnt for the link from in6_ifaddrs. 1050 * Do this only if it's not already unlinked in the event 1051 * that we lost the race, since in6_ifaddr_rwlock was momentarily 1052 * dropped above. 1053 */ 1054 if (unlinked) 1055 IFA_REMREF(ifa); 1056 /* release reference held for this routine */ 1057 IFA_REMREF(ifa); 1058 1059 /* 1060 * This is suboptimal, but since we dropped ifnet lock above 1061 * the list might have changed. Repeat the search from the 1062 * beginning until we find the first eligible IPv6 address. 1063 */ 1064 ifnet_lock_exclusive(ifp); 1065 ifa = TAILQ_FIRST(&ifp->if_addrlist); 1066 } 1067 ifnet_lock_done(ifp); 1068 1069 /* 1070 * remove neighbor management table. we call it twice just to make 1071 * sure we nuke everything. maybe we need just one call. 1072 * XXX: since the first call did not release addresses, some prefixes 1073 * might remain. We should call nd6_purge() again to release the 1074 * prefixes after removing all addresses above. 1075 * (Or can we just delay calling nd6_purge until at this point?) 1076 */ 1077 nd6_purge(ifp); 1078 1079 /* remove route to link-local allnodes multicast (ff02::1) */ 1080 bzero(&sin6, sizeof(sin6)); 1081 sin6.sin6_len = sizeof(struct sockaddr_in6); 1082 sin6.sin6_family = AF_INET6; 1083 sin6.sin6_addr = in6addr_linklocal_allnodes; 1084 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1085 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0); 1086 if (rt != NULL) { 1087 RT_LOCK(rt); 1088 if (rt->rt_ifp == ifp) { 1089 /* 1090 * Prevent another thread from modifying rt_key, 1091 * rt_gateway via rt_setgate() after the rt_lock 1092 * is dropped by marking the route as defunct. 1093 */ 1094 rt->rt_flags |= RTF_CONDEMNED; 1095 RT_UNLOCK(rt); 1096 (void) rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1097 rt_mask(rt), rt->rt_flags, 0); 1098 } else { 1099 RT_UNLOCK(rt); 1100 } 1101 rtfree(rt); 1102 } 1103 } 1104 1105 void 1106 in6_get_tmpifid( 1107 struct ifnet *ifp, 1108 u_int8_t *retbuf, 1109 const u_int8_t *baseid, 1110 int generate) 1111 { 1112 u_int8_t nullbuf[8]; 1113 struct nd_ifinfo *ndi; 1114 1115 lck_rw_lock_shared(nd_if_rwlock); 1116 ndi = &nd_ifinfo[ifp->if_index]; 1117 bzero(nullbuf, sizeof(nullbuf)); 1118 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 1119 /* we've never created a random ID. Create a new one. */ 1120 generate = 1; 1121 } 1122 1123 if (generate) { 1124 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 1125 1126 /* generate_tmp_ifid will update seedn and buf */ 1127 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 1128 ndi->randomid); 1129 } 1130 bcopy(ndi->randomid, retbuf, 8); 1131 lck_rw_done(nd_if_rwlock); 1132 } 1133 1134 void 1135 in6_tmpaddrtimer( 1136 __unused void *ignored_arg) 1137 { 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 if (ip6_use_tempaddr) { 1147 lck_rw_lock_shared(nd_if_rwlock); 1148 bzero(nullbuf, sizeof(nullbuf)); 1149 for (i = 1; i < nd_ifinfo_indexlim + 1; i++) { 1150 ndi = &nd_ifinfo[i]; 1151 if ((ndi->flags | ND6_IFF_PERFORMNUD) != ND6_IFF_PERFORMNUD) 1152 continue; 1153 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 1154 /* 1155 * We've been generating a random ID on this interface. 1156 * Create a new one. 1157 */ 1158 (void)generate_tmp_ifid(ndi->randomseed0, 1159 ndi->randomseed1, 1160 ndi->randomid); 1161 } 1162 } 1163 lck_rw_done(nd_if_rwlock); 1164 } 1165 }
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