1/* 2 * Copyright (c) 2003-2007 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 83#include <netinet/ip6.h> 84#include <netinet6/ip6_var.h> 85#include <netinet6/in6_var.h> 86#include <netinet6/in6_pcb.h> 87#include <netinet6/in6_ifattach.h> 88#include <netinet6/ip6_var.h> 89#include <netinet6/nd6.h> 90#include <netinet6/scope6_var.h> 91 92#include <net/net_osdep.h> 93 94struct in6_ifstat **in6_ifstat = NULL; 95struct icmp6_ifstat **icmp6_ifstat = NULL; 96size_t in6_ifstatmax = 0; 97size_t icmp6_ifstatmax = 0; 98unsigned long in6_maxmtu = 0; 99extern lck_mtx_t *nd6_mutex; 100 101#if IP6_AUTO_LINKLOCAL 102int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; 103#else 104int ip6_auto_linklocal = 1; /* enable by default */ 105#endif 106 107int loopattach6_done = 0; 108 109extern struct inpcbinfo udbinfo; 110extern struct inpcbinfo ripcbinfo; 111 112static int get_rand_ifid(struct ifnet *, struct in6_addr *); 113static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 114static int get_hw_ifid(struct ifnet *, struct in6_addr *); 115static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 116static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *, struct in6_aliasreq *); 117static int in6_ifattach_loopback(struct ifnet *); 118 119#define EUI64_GBIT 0x01 120#define EUI64_UBIT 0x02 121#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 122#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 123#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 124#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 125#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 126 127#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 128#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 129 130/* 131 * Generate a last-resort interface identifier, when the machine has no 132 * IEEE802/EUI64 address sources. 133 * The goal here is to get an interface identifier that is 134 * (1) random enough and (2) does not change across reboot. 135 * We currently use MD5(hostname) for it. 136 */ 137static int 138get_rand_ifid( 139 __unused struct ifnet *ifp, 140 struct in6_addr *in6) /* upper 64bits are preserved */ 141{ 142 MD5_CTX ctxt; 143 u_int8_t digest[16]; 144 int len = strlen(hostname); 145 146#if 0 147 /* we need at least several letters as seed for ifid */ 148 if (len < 3) 149 return -1; 150#endif 151 152 /* generate 8 bytes of pseudo-random value. */ 153 bzero(&ctxt, sizeof(ctxt)); 154 MD5Init(&ctxt); 155 MD5Update(&ctxt, hostname, len); 156 MD5Final(digest, &ctxt); 157 158 /* assumes sizeof(digest) > sizeof(ifid) */ 159 bcopy(digest, &in6->s6_addr[8], 8); 160 161 /* make sure to set "u" bit to local, and "g" bit to individual. */ 162 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 163 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 164 165 /* convert EUI64 into IPv6 interface identifier */ 166 EUI64_TO_IFID(in6); 167 168 return 0; 169} 170 171static int 172generate_tmp_ifid( 173 u_int8_t *seed0, 174 const u_int8_t *seed1, 175 u_int8_t *ret) 176{ 177 MD5_CTX ctxt; 178 u_int8_t seed[16], digest[16], nullbuf[8]; 179 u_int32_t val32; 180 struct timeval tv; 181 182 /* If there's no hisotry, start with a random seed. */ 183 bzero(nullbuf, sizeof(nullbuf)); 184 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 185 int i; 186 187 for (i = 0; i < 2; i++) { 188 microtime(&tv); 189 val32 = random() ^ tv.tv_usec; 190 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 191 } 192 } else { 193 bcopy(seed0, seed, 8); 194 } 195 196 /* copy the right-most 64-bits of the given address */ 197 /* XXX assumption on the size of IFID */ 198 bcopy(seed1, &seed[8], 8); 199 200 if (0) { /* for debugging purposes only */ 201 int i; 202 203 printf("generate_tmp_ifid: new randomized ID from: "); 204 for (i = 0; i < 16; i++) 205 printf("%02x", seed[i]); 206 printf(" "); 207 } 208 209 /* generate 16 bytes of pseudo-random value. */ 210 bzero(&ctxt, sizeof(ctxt)); 211 MD5Init(&ctxt); 212 MD5Update(&ctxt, seed, sizeof(seed)); 213 MD5Final(digest, &ctxt); 214 215 /* 216 * RFC 3041 3.2.1. (3) 217 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 218 * left-most bit is numbered 0) to zero. 219 */ 220 bcopy(digest, ret, 8); 221 ret[0] &= ~EUI64_UBIT; 222 223 /* 224 * XXX: we'd like to ensure that the generated value is not zero 225 * for simplicity. If the caclculated digest happens to be zero, 226 * use a random non-zero value as the last resort. 227 */ 228 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 229 log(LOG_INFO, 230 "generate_tmp_ifid: computed MD5 value is zero.\n"); 231 232 microtime(&tv); 233 val32 = random() ^ tv.tv_usec; 234 val32 = 1 + (val32 % (0xffffffff - 1)); 235 } 236 237 /* 238 * RFC 3041 3.2.1. (4) 239 * Take the rightmost 64-bits of the MD5 digest and save them in 240 * stable storage as the history value to be used in the next 241 * iteration of the algorithm. 242 */ 243 bcopy(&digest[8], seed0, 8); 244 245 if (0) { /* for debugging purposes only */ 246 int i; 247 248 printf("to: "); 249 for (i = 0; i < 16; i++) 250 printf("%02x", digest[i]); 251 printf("\n"); 252 } 253 254 return 0; 255} 256 257/* 258 * Get interface identifier for the specified interface. 259 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 260 */ 261static int 262get_hw_ifid( 263 struct ifnet *ifp, 264 struct in6_addr *in6) /* upper 64bits are preserved */ 265{ 266 struct ifaddr *ifa; 267 struct sockaddr_dl *sdl; 268 u_int8_t *addr; 269 size_t addrlen; 270 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 271 static u_int8_t allone[8] = 272 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 273 274 /* Why doesn't this code use ifnet_addrs? */ 275 ifnet_lock_shared(ifp); 276 for (ifa = ifp->if_addrlist.tqh_first; 277 ifa; 278 ifa = ifa->ifa_list.tqe_next) 279 { 280 if (ifa->ifa_addr->sa_family != AF_LINK) 281 continue; 282 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 283 if (sdl == NULL) 284 continue; 285 if (sdl->sdl_alen == 0) 286 continue; 287 288 goto found; 289 } 290 ifnet_lock_done(ifp); 291 292 return -1; 293 294found: 295 ifnet_lock_done(ifp); 296 addr = (u_int8_t *) LLADDR(sdl); 297 addrlen = sdl->sdl_alen; 298 299 /* get EUI64 */ 300 switch (ifp->if_type) { 301 case IFT_ETHER: 302 case IFT_FDDI: 303 case IFT_ATM: 304 case IFT_IEEE1394: 305 case IFT_L2VLAN: 306 case IFT_IEEE8023ADLAG: 307#if IFT_IEEE80211 308 case IFT_IEEE80211: 309#endif 310 /* IEEE802/EUI64 cases - what others? */ 311 /* IEEE1394 uses 16byte length address starting with EUI64 */ 312 if (addrlen > 8) 313 addrlen = 8; 314 315 /* look at IEEE802/EUI64 only */ 316 if (addrlen != 8 && addrlen != 6) 317 return -1; 318 319 /* 320 * check for invalid MAC address - on bsdi, we see it a lot 321 * since wildboar configures all-zero MAC on pccard before 322 * card insertion. 323 */ 324 if (bcmp(addr, allzero, addrlen) == 0) 325 return -1; 326 if (bcmp(addr, allone, addrlen) == 0) 327 return -1; 328 329 /* make EUI64 address */ 330 if (addrlen == 8) 331 bcopy(addr, &in6->s6_addr[8], 8); 332 else if (addrlen == 6) { 333 in6->s6_addr[8] = addr[0]; 334 in6->s6_addr[9] = addr[1]; 335 in6->s6_addr[10] = addr[2]; 336 in6->s6_addr[11] = 0xff; 337 in6->s6_addr[12] = 0xfe; 338 in6->s6_addr[13] = addr[3]; 339 in6->s6_addr[14] = addr[4]; 340 in6->s6_addr[15] = addr[5]; 341 } 342 break; 343 344 case IFT_ARCNET: 345 if (addrlen != 1) 346 return -1; 347 if (!addr[0]) 348 return -1; 349 350 bzero(&in6->s6_addr[8], 8); 351 in6->s6_addr[15] = addr[0]; 352 353 /* 354 * due to insufficient bitwidth, we mark it local. 355 */ 356 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 357 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 358 break; 359 360 case IFT_GIF: 361#if IFT_STF 362 case IFT_STF: 363#endif 364 /* 365 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 366 * however, IPv4 address is not very suitable as unique 367 * identifier source (can be renumbered). 368 * we don't do this. 369 */ 370 return -1; 371 372 default: 373 return -1; 374 } 375 376 /* sanity check: g bit must not indicate "group" */ 377 if (EUI64_GROUP(in6)) 378 return -1; 379 380 /* convert EUI64 into IPv6 interface identifier */ 381 EUI64_TO_IFID(in6); 382 383 /* 384 * sanity check: ifid must not be all zero, avoid conflict with 385 * subnet router anycast 386 */ 387 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 388 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 389 return -1; 390 } 391 392 return 0; 393} 394 395/* 396 * Get interface identifier for the specified interface. If it is not 397 * available on ifp0, borrow interface identifier from other information 398 * sources. 399 */ 400static int 401get_ifid( 402 struct ifnet *ifp0, 403 struct ifnet *altifp, /* secondary EUI64 source */ 404 struct in6_addr *in6) 405{ 406 struct ifnet *ifp; 407 408 /* first, try to get it from the interface itself */ 409 if (get_hw_ifid(ifp0, in6) == 0) { 410 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 411 if_name(ifp0))); 412 goto success; 413 } 414 415 /* try secondary EUI64 source. this basically is for ATM PVC */ 416 if (altifp && get_hw_ifid(altifp, in6) == 0) { 417 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 418 if_name(ifp0), if_name(altifp))); 419 goto success; 420 } 421 422 /* next, try to get it from some other hardware interface */ 423 ifnet_head_lock_shared(); 424 TAILQ_FOREACH(ifp, &ifnet_head, if_list) { 425 if (ifp == ifp0) 426 continue; 427 if (get_hw_ifid(ifp, in6) != 0) 428 continue; 429 430 /* 431 * to borrow ifid from other interface, ifid needs to be 432 * globally unique 433 */ 434 if (IFID_UNIVERSAL(in6)) { 435 nd6log((LOG_DEBUG, 436 "%s: borrow interface identifier from %s\n", 437 if_name(ifp0), if_name(ifp))); 438 ifnet_head_done(); 439 goto success; 440 } 441 } 442 ifnet_head_done(); 443 444 /* last resort: get from random number source */ 445 if (get_rand_ifid(ifp, in6) == 0) { 446 nd6log((LOG_DEBUG, 447 "%s: interface identifier generated by random number\n", 448 if_name(ifp0))); 449 goto success; 450 } 451 452 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 453 return -1; 454 455success: 456 nd6log((LOG_INFO, "%s: ifid: " 457 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 458 if_name(ifp0), 459 in6->s6_addr[8], in6->s6_addr[9], 460 in6->s6_addr[10], in6->s6_addr[11], 461 in6->s6_addr[12], in6->s6_addr[13], 462 in6->s6_addr[14], in6->s6_addr[15])); 463 return 0; 464} 465 466static int 467in6_ifattach_linklocal( 468 struct ifnet *ifp, 469 struct ifnet *altifp, /* secondary EUI64 source */ 470 struct in6_aliasreq *ifra_passed) 471{ 472 struct in6_ifaddr *ia; 473 struct in6_aliasreq ifra; 474 struct nd_prefix pr0, *pr; 475 int i, error; 476 477 /* 478 * configure link-local address. 479 */ 480 bzero(&ifra, sizeof(ifra)); 481 482 proto_plumb(PF_INET6, ifp); 483 484 /* 485 * in6_update_ifa() does not use ifra_name, but we accurately set it 486 * for safety. 487 */ 488 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 489 490 if (ifp->if_type == IFT_PPP && ifra_passed != NULL) /* PPP provided both addresses for us */ 491 bcopy(&ifra_passed->ifra_addr, &(ifra.ifra_addr), sizeof(struct sockaddr_in6)); 492 else { 493 ifra.ifra_addr.sin6_family = AF_INET6; 494 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 495 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 496#if SCOPEDROUTING 497 ifra.ifra_addr.sin6_addr.s6_addr16[1] = 0 498#else 499 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); /* XXX */ 500#endif 501 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 502 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 503 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 504 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 505 } else { 506 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 507 nd6log((LOG_ERR, 508 " %s: no ifid available\n", if_name(ifp))); 509 return -1; 510 } 511 } 512#if SCOPEDROUTING 513 ifra.ifra_addr.sin6_scope_id = 514 in6_addr2scopeid(ifp, &ifra.ifra_addr.sin6_addr); 515#endif 516 } 517 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 518 ifra.ifra_prefixmask.sin6_family = AF_INET6; 519 ifra.ifra_prefixmask.sin6_addr = in6mask64; 520#if SCOPEDROUTING 521 /* take into accound the sin6_scope_id field for routing */ 522 ifra.ifra_prefixmask.sin6_scope_id = 0xffffffff; 523#endif 524 /* link-local addresses should NEVER expire. */ 525 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 526 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 527 528 /* 529 * Do not let in6_update_ifa() do DAD, since we need a random delay 530 * before sending an NS at the first time the interface becomes up. 531 * Instead, in6_if_up() will start DAD with a proper random delay. 532 */ 533 ifra.ifra_flags |= IN6_IFF_NODAD; 534 535 /* 536 * Now call in6_update_ifa() to do a bunch of procedures to configure 537 * a link-local address. We can set NULL to the 3rd argument, because 538 * we know there's no other link-local address on the interface 539 * and therefore we are adding one (instead of updating one). 540 */ 541 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 542 /* 543 * XXX: When the interface does not support IPv6, this call 544 * would fail in the SIOCSIFADDR ioctl. I believe the 545 * notification is rather confusing in this case, so just 546 * supress it. (jinmei@kame.net 20010130) 547 */ 548 if (error != EAFNOSUPPORT) 549 log(LOG_NOTICE, "in6_ifattach_linklocal: failed to " 550 "configure a link-local address on %s " 551 "(errno=%d)\n", 552 if_name(ifp), error); 553 return(-1); 554 } 555 556 /* 557 * Adjust ia6_flags so that in6_if_up will perform DAD. 558 * XXX: Some P2P interfaces seem not to send packets just after 559 * becoming up, so we skip p2p interfaces for safety. 560 */ 561 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 562#if DIAGNOSTIC 563 if (!ia) { 564 panic("ia == NULL in in6_ifattach_linklocal"); 565 /*NOTREACHED*/ 566 } 567#endif 568 if (in6if_do_dad(ifp) && (ifp->if_flags & IFF_POINTOPOINT) == 0) { 569 ia->ia6_flags &= ~IN6_IFF_NODAD; 570 ia->ia6_flags |= IN6_IFF_TENTATIVE; 571 } 572 573 /* 574 * Make the link-local prefix (fe80::/64%link) as on-link. 575 * Since we'd like to manage prefixes separately from addresses, 576 * we make an ND6 prefix structure for the link-local prefix, 577 * and add it to the prefix list as a never-expire prefix. 578 * XXX: this change might affect some existing code base... 579 */ 580 bzero(&pr0, sizeof(pr0)); 581 pr0.ndpr_ifp = ifp; 582 /* this should be 64 at this moment. */ 583 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 584 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 585 pr0.ndpr_prefix = ifra.ifra_addr; 586 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 587 for (i = 0; i < 4; i++) { 588 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 589 in6mask64.s6_addr32[i]; 590 } 591 /* 592 * Initialize parameters. The link-local prefix must always be 593 * on-link, and its lifetimes never expire. 594 */ 595 pr0.ndpr_raf_onlink = 1; 596 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 597 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 598 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 599 /* 600 * Since there is no other link-local addresses, nd6_prefix_lookup() 601 * probably returns NULL. However, we cannot always expect the result. 602 * For example, if we first remove the (only) existing link-local 603 * address, and then reconfigure another one, the prefix is still 604 * valid with referring to the old link-local address. 605 */ 606 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 607 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) 608 return(error); 609 } 610 611 in6_post_msg(ifp, KEV_INET6_NEW_LL_ADDR, ia); 612 613 /* Drop use count held above during lookup/add */ 614 if (pr != NULL) 615 ndpr_rele(pr, FALSE); 616 617 return 0; 618} 619 620static int 621in6_ifattach_loopback( 622 struct ifnet *ifp) /* must be IFT_LOOP */ 623{ 624 struct in6_aliasreq ifra; 625 int error; 626 627 bzero(&ifra, sizeof(ifra)); 628 629 /* 630 * in6_update_ifa() does not use ifra_name, but we accurately set it 631 * for safety. 632 */ 633 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 634 635 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 636 ifra.ifra_prefixmask.sin6_family = AF_INET6; 637 ifra.ifra_prefixmask.sin6_addr = in6mask128; 638 639 /* 640 * Always initialize ia_dstaddr (= broadcast address) to loopback 641 * address. Follows IPv4 practice - see in_ifinit(). 642 */ 643 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 644 ifra.ifra_dstaddr.sin6_family = AF_INET6; 645 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 646 647 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 648 ifra.ifra_addr.sin6_family = AF_INET6; 649 ifra.ifra_addr.sin6_addr = in6addr_loopback; 650 651 /* the loopback address should NEVER expire. */ 652 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 653 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 654 655 /* we don't need to perform DAD on loopback interfaces. */ 656 ifra.ifra_flags |= IN6_IFF_NODAD; 657 658 /* skip registration to the prefix list. XXX should be temporary. */ 659 ifra.ifra_flags |= IN6_IFF_NOPFX; 660 661 /* 662 * We are sure that this is a newly assigned address, so we can set 663 * NULL to the 3rd arg. 664 */ 665 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 666 log(LOG_ERR, "in6_ifattach_loopback: failed to configure " 667 "the loopback address on %s (errno=%d)\n", 668 if_name(ifp), error); 669 return(-1); 670 } 671 672 return 0; 673} 674 675/* 676 * compute NI group address, based on the current hostname setting. 677 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 678 * 679 * when ifp == NULL, the caller is responsible for filling scopeid. 680 */ 681int 682in6_nigroup( 683 struct ifnet *ifp, 684 const char *name, 685 int namelen, 686 struct in6_addr *in6) 687{ 688 const char *p; 689 u_char *q; 690 MD5_CTX ctxt; 691 u_int8_t digest[16]; 692 char l; 693 char n[64]; /* a single label must not exceed 63 chars */ 694 695 if (!namelen || !name) 696 return -1; 697 698 p = name; 699 while (p && *p && *p != '.' && p - name < namelen) 700 p++; 701 if (p - name > sizeof(n) - 1) 702 return -1; /* label too long */ 703 l = p - name; 704 strncpy(n, name, l); 705 n[(int)l] = '\0'; 706 for (q = (u_char *) n; *q; q++) { 707 if ('A' <= *q && *q <= 'Z') 708 *q = *q - 'A' + 'a'; 709 } 710 711 /* generate 8 bytes of pseudo-random value. */ 712 bzero(&ctxt, sizeof(ctxt)); 713 MD5Init(&ctxt); 714 MD5Update(&ctxt, &l, sizeof(l)); 715 MD5Update(&ctxt, n, l); 716 MD5Final(digest, &ctxt); 717 718 bzero(in6, sizeof(*in6)); 719 in6->s6_addr16[0] = htons(0xff02); 720 if (ifp) 721 in6->s6_addr16[1] = htons(ifp->if_index); 722 in6->s6_addr8[11] = 2; 723 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 724 725 return 0; 726} 727 728void 729in6_nigroup_attach( 730 const char *name, 731 int namelen) 732{ 733 struct ifnet *ifp; 734 struct sockaddr_in6 mltaddr; 735 struct in6_multi *in6m; 736 int error; 737 738 bzero(&mltaddr, sizeof(mltaddr)); 739 mltaddr.sin6_family = AF_INET6; 740 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 741 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 742 return; 743 744 ifnet_head_lock_shared(); 745 TAILQ_FOREACH(ifp, &ifnet_head, if_list) { 746 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 747 ifnet_lock_shared(ifp); 748 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 749 ifnet_lock_done(ifp); 750 if (!in6m) { 751 if (!in6_addmulti(&mltaddr.sin6_addr, ifp, &error, 0)) { 752 nd6log((LOG_ERR, "%s: failed to join %s " 753 "(errno=%d)\n", if_name(ifp), 754 ip6_sprintf(&mltaddr.sin6_addr), 755 error)); 756 } 757 } 758 } 759 ifnet_head_done(); 760} 761 762void 763in6_nigroup_detach( 764 const char *name, 765 int namelen) 766{ 767 struct ifnet *ifp; 768 struct sockaddr_in6 mltaddr; 769 struct in6_multi *in6m; 770 771 bzero(&mltaddr, sizeof(mltaddr)); 772 mltaddr.sin6_family = AF_INET6; 773 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 774 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 775 return; 776 777 ifnet_head_lock_shared(); 778 TAILQ_FOREACH(ifp, &ifnet_head, if_list) { 779 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 780 ifnet_lock_shared(ifp); 781 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 782 ifnet_lock_done(ifp); 783 if (in6m) 784 in6_delmulti(in6m, 0); 785 } 786 ifnet_head_done(); 787} 788 789/* 790 * XXX multiple loopback interface needs more care. for instance, 791 * nodelocal address needs to be configured onto only one of them. 792 * XXX multiple link-local address case 793 */ 794void 795in6_ifattach( 796 struct ifnet *ifp, 797 struct ifnet *altifp, /* secondary EUI64 source */ 798 struct in6_aliasreq *ifra) 799{ 800 static size_t if_indexlim = 8; 801 struct in6_ifaddr *ia; 802 struct in6_addr in6; 803 804 /* 805 * We have some arrays that should be indexed by if_index. 806 * since if_index will grow dynamically, they should grow too. 807 * struct in6_ifstat **in6_ifstat 808 * struct icmp6_ifstat **icmp6_ifstat 809 */ 810 if (in6_ifstat == NULL || icmp6_ifstat == NULL || 811 if_index >= if_indexlim) { 812 size_t n; 813 caddr_t q; 814 size_t olim; 815 816 olim = if_indexlim; 817 while (if_index >= if_indexlim) 818 if_indexlim <<= 1; 819 820 /* grow in6_ifstat */ 821 n = if_indexlim * sizeof(struct in6_ifstat *); 822 q = (caddr_t)_MALLOC(n, M_IFADDR, M_WAITOK); 823 bzero(q, n); 824 if (in6_ifstat) { 825 bcopy((caddr_t)in6_ifstat, q, 826 olim * sizeof(struct in6_ifstat *)); 827 FREE((caddr_t)in6_ifstat, M_IFADDR); 828 } 829 in6_ifstat = (struct in6_ifstat **)q; 830 in6_ifstatmax = if_indexlim; 831 832 /* grow icmp6_ifstat */ 833 n = if_indexlim * sizeof(struct icmp6_ifstat *); 834 q = (caddr_t)_MALLOC(n, M_IFADDR, M_WAITOK); 835 bzero(q, n); 836 if (icmp6_ifstat) { 837 bcopy((caddr_t)icmp6_ifstat, q, 838 olim * sizeof(struct icmp6_ifstat *)); 839 FREE((caddr_t)icmp6_ifstat, M_IFADDR); 840 } 841 icmp6_ifstat = (struct icmp6_ifstat **)q; 842 icmp6_ifstatmax = if_indexlim; 843 } 844 845 /* initialize NDP variables */ 846 nd6_ifattach(ifp); 847 848 /* initialize scope identifiers */ 849 scope6_ifattach(ifp); 850 851 /* 852 * quirks based on interface type 853 */ 854 switch (ifp->if_type) { 855#if IFT_STF 856 case IFT_STF: 857 /* 858 * 6to4 interface is a very special kind of beast. 859 * no multicast, no linklocal. RFC2529 specifies how to make 860 * linklocals for 6to4 interface, but there's no use and 861 * it is rather harmful to have one. 862 */ 863 goto statinit; 864#endif 865 default: 866 break; 867 } 868 869 /* 870 * usually, we require multicast capability to the interface 871 */ 872 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 873 log(LOG_INFO, "in6_ifattach: " 874 "%s is not multicast capable, IPv6 not enabled\n", 875 if_name(ifp)); 876 return; 877 } 878 879 /* 880 * assign loopback address for loopback interface. 881 * XXX multiple loopback interface case. 882 */ 883 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 884 struct in6_ifaddr *ia6 = NULL; 885 if (!OSCompareAndSwap(0, 1, (UInt32 *)&loopattach6_done)) { 886 in6 = in6addr_loopback; 887 if ((ia6 = in6ifa_ifpwithaddr(ifp, &in6)) == NULL) { 888 if (in6_ifattach_loopback(ifp) != 0) { 889 OSCompareAndSwap(1, 0, (UInt32 *)&loopattach6_done); 890 return; 891 } 892 } 893 else { 894 ifafree(&ia6->ia_ifa); 895 } 896 } 897 } 898 899 /* 900 * assign a link-local address, if there's none. 901 */ 902 if (ip6_auto_linklocal) { 903 ia = in6ifa_ifpforlinklocal(ifp, 0); 904 if (ia == NULL) { 905 if (in6_ifattach_linklocal(ifp, altifp, ifra) == 0) { 906 /* linklocal address assigned */ 907 } else { 908 log(LOG_INFO, "in6_ifattach: " 909 "%s failed to attach a linklocal address.\n", 910 if_name(ifp)); 911 /* failed to assign linklocal address. bark? */ 912 } 913 } 914 } 915 916#if IFT_STF /* XXX */ 917statinit: 918#endif 919 920 /* update dynamically. */ 921 if (in6_maxmtu < ifp->if_mtu) 922 in6_maxmtu = ifp->if_mtu; 923 924 if (in6_ifstat[ifp->if_index] == NULL) { 925 in6_ifstat[ifp->if_index] = (struct in6_ifstat *) 926 _MALLOC(sizeof(struct in6_ifstat), M_IFADDR, M_WAITOK); 927 bzero(in6_ifstat[ifp->if_index], sizeof(struct in6_ifstat)); 928 } 929 if (icmp6_ifstat[ifp->if_index] == NULL) { 930 icmp6_ifstat[ifp->if_index] = (struct icmp6_ifstat *) 931 _MALLOC(sizeof(struct icmp6_ifstat), M_IFADDR, M_WAITOK); 932 bzero(icmp6_ifstat[ifp->if_index], sizeof(struct icmp6_ifstat)); 933 } 934} 935 936/* 937 * NOTE: in6_ifdetach() does not support loopback if at this moment. 938 * We don't need this function in bsdi, because interfaces are never removed 939 * from the ifnet list in bsdi. 940 */ 941void 942in6_ifdetach( 943 struct ifnet *ifp) 944{ 945 struct in6_ifaddr *ia, *oia, *nia; 946 struct ifaddr *ifa, *next; 947 struct rtentry *rt; 948 short rtflags; 949 struct sockaddr_in6 sin6; 950 951 /* nuke prefix list. this may try to remove some of ifaddrs as well */ 952 in6_purgeprefix(ifp); 953 954 /* remove neighbor management table */ 955 nd6_purge(ifp); 956 957 /* nuke any of IPv6 addresses we have */ 958 959 lck_mtx_lock(nd6_mutex); 960 for (ia = in6_ifaddrs; ia != NULL; ia = nia) { 961 nia = ia->ia_next; 962 if (ia->ia_ifa.ifa_ifp != ifp) 963 continue; 964 in6_purgeaddr(&ia->ia_ifa, 1); 965 } 966 lck_mtx_unlock(nd6_mutex); 967 968 ifnet_lock_exclusive(ifp); 969 970 /* undo everything done by in6_ifattach(), just in case */ 971 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 972 { 973 next = ifa->ifa_list.tqe_next; 974 975 976 if (ifa->ifa_addr->sa_family != AF_INET6 977 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 978 continue; 979 } 980 981 ia = (struct in6_ifaddr *)ifa; 982 983 /* remove from the routing table */ 984 lck_mtx_lock(rt_mtx); 985 if ((ia->ia_flags & IFA_ROUTE) && 986 (rt = rtalloc1_locked((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 987 rtflags = rt->rt_flags; 988 rtfree_locked(rt); 989 rtrequest_locked(RTM_DELETE, 990 (struct sockaddr *)&ia->ia_addr, 991 (struct sockaddr *)&ia->ia_addr, 992 (struct sockaddr *)&ia->ia_prefixmask, 993 rtflags, (struct rtentry **)0); 994 } 995 lck_mtx_unlock(rt_mtx); 996 997 /* remove from the linked list */ 998 if_detach_ifa(ifp, &ia->ia_ifa); 999 ifafree(&ia->ia_ifa); 1000 1001 /* also remove from the IPv6 address chain(itojun&jinmei) */ 1002 oia = ia; 1003 lck_mtx_lock(nd6_mutex); 1004 if (oia == (ia = in6_ifaddrs)) 1005 in6_ifaddrs = ia->ia_next; 1006 else { 1007 while (ia->ia_next && (ia->ia_next != oia)) 1008 ia = ia->ia_next; 1009 if (ia->ia_next) 1010 ia->ia_next = oia->ia_next; 1011 else { 1012 nd6log((LOG_ERR, 1013 "%s: didn't unlink in6ifaddr from " 1014 "list\n", if_name(ifp))); 1015 } 1016 } 1017 lck_mtx_unlock(nd6_mutex); 1018 1019 ifafree(&oia->ia_ifa); 1020 } 1021 ifnet_lock_done(ifp); 1022 1023 /* 1024 * remove neighbor management table. we call it twice just to make 1025 * sure we nuke everything. maybe we need just one call. 1026 * XXX: since the first call did not release addresses, some prefixes 1027 * might remain. We should call nd6_purge() again to release the 1028 * prefixes after removing all addresses above. 1029 * (Or can we just delay calling nd6_purge until at this point?) 1030 */ 1031 nd6_purge(ifp); 1032 1033 /* remove route to link-local allnodes multicast (ff02::1) */ 1034 bzero(&sin6, sizeof(sin6)); 1035 sin6.sin6_len = sizeof(struct sockaddr_in6); 1036 sin6.sin6_family = AF_INET6; 1037 sin6.sin6_addr = in6addr_linklocal_allnodes; 1038 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1039 lck_mtx_lock(rt_mtx); 1040 rt = rtalloc1_locked((struct sockaddr *)&sin6, 0, 0UL); 1041 if (rt != NULL) { 1042 if (rt->rt_ifp == ifp) { 1043 rtrequest_locked(RTM_DELETE, (struct sockaddr *)rt_key(rt), 1044 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 1045 } 1046 rtfree_locked(rt); 1047 } 1048 lck_mtx_unlock(rt_mtx); 1049} 1050 1051void 1052in6_get_tmpifid( 1053 struct ifnet *ifp, 1054 u_int8_t *retbuf, 1055 const u_int8_t *baseid, 1056 int generate) 1057{ 1058 u_int8_t nullbuf[8]; 1059 struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index]; 1060 1061 bzero(nullbuf, sizeof(nullbuf)); 1062 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 1063 /* we've never created a random ID. Create a new one. */ 1064 generate = 1; 1065 } 1066 1067 if (generate) { 1068 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 1069 1070 /* generate_tmp_ifid will update seedn and buf */ 1071 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 1072 ndi->randomid); 1073 } 1074 bcopy(ndi->randomid, retbuf, 8); 1075} 1076 1077extern size_t nd_ifinfo_indexlim; 1078void 1079in6_tmpaddrtimer( 1080 __unused void *ignored_arg) 1081{ 1082 int i; 1083 struct nd_ifinfo *ndi; 1084 u_int8_t nullbuf[8]; 1085 1086 timeout(in6_tmpaddrtimer, (caddr_t)0, 1087 (ip6_temp_preferred_lifetime - ip6_desync_factor - 1088 ip6_temp_regen_advance) * hz); 1089 1090 if (ip6_use_tempaddr) { 1091 1092 bzero(nullbuf, sizeof(nullbuf)); 1093 for (i = 1; i < nd_ifinfo_indexlim + 1; i++) { 1094 ndi = &nd_ifinfo[i]; 1095 if (ndi->flags != ND6_IFF_PERFORMNUD) 1096 continue; 1097 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 1098 /* 1099 * We've been generating a random ID on this interface. 1100 * Create a new one. 1101 */ 1102 (void)generate_tmp_ifid(ndi->randomseed0, 1103 ndi->randomseed1, 1104 ndi->randomid); 1105 } 1106 } 1107 } 1108} 1109