1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $ 32 */ 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/malloc.h> 37 #include <sys/socket.h> 38 #include <sys/sockio.h> 39 #include <sys/jail.h> 40 #include <sys/kernel.h> 41 #include <sys/lock.h> 42 #include <sys/proc.h> 43 #include <sys/rmlock.h> 44 #include <sys/syslog.h> 45 #include <sys/md5.h> 46 47 #include <net/if.h> 48 #include <net/if_var.h> 49 #include <net/if_dl.h> 50 #include <net/if_private.h> 51 #include <net/if_types.h> 52 #include <net/route.h> 53 #include <net/vnet.h> 54 55 #include <netinet/in.h> 56 #include <netinet/in_var.h> 57 #include <netinet/if_ether.h> 58 #include <netinet/in_pcb.h> 59 #include <netinet/ip_var.h> 60 #include <netinet/udp.h> 61 #include <netinet/udp_var.h> 62 63 #include <netinet/ip6.h> 64 #include <netinet6/ip6_var.h> 65 #include <netinet6/in6_var.h> 66 #include <netinet6/in6_pcb.h> 67 #include <netinet6/in6_ifattach.h> 68 #include <netinet6/ip6_var.h> 69 #include <netinet6/nd6.h> 70 #include <netinet6/mld6_var.h> 71 #include <netinet6/scope6_var.h> 72 73 #ifdef IP6_AUTO_LINKLOCAL 74 VNET_DEFINE(int, ip6_auto_linklocal) = IP6_AUTO_LINKLOCAL; 75 #else 76 VNET_DEFINE(int, ip6_auto_linklocal) = 1; /* enabled by default */ 77 #endif 78 79 VNET_DEFINE(struct callout, in6_tmpaddrtimer_ch); 80 #define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch) 81 82 VNET_DECLARE(struct inpcbinfo, ripcbinfo); 83 #define V_ripcbinfo VNET(ripcbinfo) 84 85 static int get_rand_ifid(struct ifnet *, struct in6_addr *); 86 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 87 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 88 static int in6_ifattach_loopback(struct ifnet *); 89 static void in6_purgemaddrs(struct ifnet *); 90 91 #define EUI64_GBIT 0x01 92 #define EUI64_UBIT 0x02 93 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 94 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 95 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 96 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 97 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 98 99 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 100 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 101 102 /* 103 * Generate a last-resort interface identifier, when the machine has no 104 * IEEE802/EUI64 address sources. 105 * The goal here is to get an interface identifier that is 106 * (1) random enough and (2) does not change across reboot. 107 * We currently use MD5(hostname) for it. 108 * 109 * in6 - upper 64bits are preserved 110 */ 111 static int 112 get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 113 { 114 MD5_CTX ctxt; 115 struct prison *pr; 116 u_int8_t digest[16]; 117 int hostnamelen; 118 119 pr = curthread->td_ucred->cr_prison; 120 mtx_lock(&pr->pr_mtx); 121 hostnamelen = strlen(pr->pr_hostname); 122 #if 0 123 /* we need at least several letters as seed for ifid */ 124 if (hostnamelen < 3) { 125 mtx_unlock(&pr->pr_mtx); 126 return -1; 127 } 128 #endif 129 130 /* generate 8 bytes of pseudo-random value. */ 131 bzero(&ctxt, sizeof(ctxt)); 132 MD5Init(&ctxt); 133 MD5Update(&ctxt, pr->pr_hostname, hostnamelen); 134 mtx_unlock(&pr->pr_mtx); 135 MD5Final(digest, &ctxt); 136 137 /* assumes sizeof(digest) > sizeof(ifid) */ 138 bcopy(digest, &in6->s6_addr[8], 8); 139 140 /* make sure to set "u" bit to local, and "g" bit to individual. */ 141 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 142 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 143 144 /* convert EUI64 into IPv6 interface identifier */ 145 EUI64_TO_IFID(in6); 146 147 return 0; 148 } 149 150 151 /* 152 * Get interface identifier for the specified interface. 153 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 154 * 155 * in6 - upper 64bits are preserved 156 */ 157 int 158 in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 159 { 160 struct ifaddr *ifa; 161 struct sockaddr_dl *sdl; 162 u_int8_t *addr; 163 size_t addrlen; 164 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 165 static u_int8_t allone[8] = 166 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 167 168 NET_EPOCH_ASSERT(); 169 170 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 171 if (ifa->ifa_addr->sa_family != AF_LINK) 172 continue; 173 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 174 if (sdl == NULL) 175 continue; 176 if (sdl->sdl_alen == 0) 177 continue; 178 179 goto found; 180 } 181 182 return -1; 183 184 found: 185 addr = LLADDR(sdl); 186 addrlen = sdl->sdl_alen; 187 188 /* get EUI64 */ 189 switch (ifp->if_type) { 190 case IFT_BRIDGE: 191 case IFT_ETHER: 192 case IFT_L2VLAN: 193 case IFT_ATM: 194 case IFT_IEEE1394: 195 /* IEEE802/EUI64 cases - what others? */ 196 /* IEEE1394 uses 16byte length address starting with EUI64 */ 197 if (addrlen > 8) 198 addrlen = 8; 199 200 /* look at IEEE802/EUI64 only */ 201 if (addrlen != 8 && addrlen != 6) 202 return -1; 203 204 /* 205 * check for invalid MAC address - on bsdi, we see it a lot 206 * since wildboar configures all-zero MAC on pccard before 207 * card insertion. 208 */ 209 if (bcmp(addr, allzero, addrlen) == 0) 210 return -1; 211 if (bcmp(addr, allone, addrlen) == 0) 212 return -1; 213 214 /* make EUI64 address */ 215 if (addrlen == 8) 216 bcopy(addr, &in6->s6_addr[8], 8); 217 else if (addrlen == 6) { 218 in6->s6_addr[8] = addr[0]; 219 in6->s6_addr[9] = addr[1]; 220 in6->s6_addr[10] = addr[2]; 221 in6->s6_addr[11] = 0xff; 222 in6->s6_addr[12] = 0xfe; 223 in6->s6_addr[13] = addr[3]; 224 in6->s6_addr[14] = addr[4]; 225 in6->s6_addr[15] = addr[5]; 226 } 227 break; 228 229 case IFT_GIF: 230 case IFT_STF: 231 /* 232 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 233 * however, IPv4 address is not very suitable as unique 234 * identifier source (can be renumbered). 235 * we don't do this. 236 */ 237 return -1; 238 239 case IFT_INFINIBAND: 240 if (addrlen != 20) 241 return -1; 242 bcopy(addr + 12, &in6->s6_addr[8], 8); 243 break; 244 245 default: 246 return -1; 247 } 248 249 /* sanity check: g bit must not indicate "group" */ 250 if (EUI64_GROUP(in6)) 251 return -1; 252 253 /* convert EUI64 into IPv6 interface identifier */ 254 EUI64_TO_IFID(in6); 255 256 /* 257 * sanity check: ifid must not be all zero, avoid conflict with 258 * subnet router anycast 259 */ 260 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 261 bcmp(&in6->s6_addr[9], allzero, 7) == 0) 262 return -1; 263 264 return 0; 265 } 266 267 /* 268 * Get interface identifier for the specified interface. If it is not 269 * available on ifp0, borrow interface identifier from other information 270 * sources. 271 * 272 * altifp - secondary EUI64 source 273 */ 274 static int 275 get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 276 struct in6_addr *in6) 277 { 278 struct ifnet *ifp; 279 280 NET_EPOCH_ASSERT(); 281 282 /* first, try to get it from the interface itself */ 283 if (in6_get_hw_ifid(ifp0, in6) == 0) { 284 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 285 if_name(ifp0))); 286 goto success; 287 } 288 289 /* try secondary EUI64 source. this basically is for ATM PVC */ 290 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 291 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 292 if_name(ifp0), if_name(altifp))); 293 goto success; 294 } 295 296 /* next, try to get it from some other hardware interface */ 297 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 298 if (ifp == ifp0) 299 continue; 300 if (in6_get_hw_ifid(ifp, in6) != 0) 301 continue; 302 303 /* 304 * to borrow ifid from other interface, ifid needs to be 305 * globally unique 306 */ 307 if (IFID_UNIVERSAL(in6)) { 308 nd6log((LOG_DEBUG, 309 "%s: borrow interface identifier from %s\n", 310 if_name(ifp0), if_name(ifp))); 311 goto success; 312 } 313 } 314 315 /* last resort: get from random number source */ 316 if (get_rand_ifid(ifp, in6) == 0) { 317 nd6log((LOG_DEBUG, 318 "%s: interface identifier generated by random number\n", 319 if_name(ifp0))); 320 goto success; 321 } 322 323 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 324 return -1; 325 326 success: 327 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 328 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 329 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 330 in6->s6_addr[14], in6->s6_addr[15])); 331 return 0; 332 } 333 334 /* 335 * altifp - secondary EUI64 source 336 */ 337 static int 338 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 339 { 340 struct in6_ifaddr *ia; 341 struct in6_aliasreq ifra; 342 struct nd_prefixctl pr0; 343 struct epoch_tracker et; 344 struct nd_prefix *pr; 345 int error; 346 347 /* 348 * configure link-local address. 349 */ 350 in6_prepare_ifra(&ifra, NULL, &in6mask64); 351 352 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 353 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 354 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 355 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 356 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 357 } else { 358 NET_EPOCH_ENTER(et); 359 error = get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr); 360 NET_EPOCH_EXIT(et); 361 if (error != 0) { 362 nd6log((LOG_ERR, 363 "%s: no ifid available\n", if_name(ifp))); 364 return (-1); 365 } 366 } 367 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 368 return (-1); 369 370 /* link-local addresses should NEVER expire. */ 371 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 372 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 373 374 /* 375 * Now call in6_update_ifa() to do a bunch of procedures to configure 376 * a link-local address. We can set the 3rd argument to NULL, because 377 * we know there's no other link-local address on the interface 378 * and therefore we are adding one (instead of updating one). 379 */ 380 if ((error = in6_update_ifa(ifp, &ifra, NULL, 381 IN6_IFAUPDATE_DADDELAY)) != 0) { 382 /* 383 * XXX: When the interface does not support IPv6, this call 384 * would fail in the SIOCSIFADDR ioctl. I believe the 385 * notification is rather confusing in this case, so just 386 * suppress it. (jinmei@kame.net 20010130) 387 */ 388 if (error != EAFNOSUPPORT) 389 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 390 "configure a link-local address on %s " 391 "(errno=%d)\n", 392 if_name(ifp), error)); 393 return (-1); 394 } 395 396 NET_EPOCH_ENTER(et); 397 ia = in6ifa_ifpforlinklocal(ifp, 0); 398 NET_EPOCH_EXIT(et); 399 if (ia == NULL) { 400 /* 401 * Another thread removed the address that we just added. 402 * This should be rare, but it happens. 403 */ 404 nd6log((LOG_NOTICE, "%s: %s: new link-local address " 405 "disappeared\n", __func__, if_name(ifp))); 406 return (-1); 407 } 408 ifa_free(&ia->ia_ifa); 409 410 /* 411 * Make the link-local prefix (fe80::%link/64) as on-link. 412 * Since we'd like to manage prefixes separately from addresses, 413 * we make an ND6 prefix structure for the link-local prefix, 414 * and add it to the prefix list as a never-expire prefix. 415 * XXX: this change might affect some existing code base... 416 */ 417 bzero(&pr0, sizeof(pr0)); 418 pr0.ndpr_ifp = ifp; 419 /* this should be 64 at this moment. */ 420 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 421 pr0.ndpr_prefix = ifra.ifra_addr; 422 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 423 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, &in6mask64); 424 /* 425 * Initialize parameters. The link-local prefix must always be 426 * on-link, and its lifetimes never expire. 427 */ 428 pr0.ndpr_raf_onlink = 1; 429 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 430 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 431 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 432 /* 433 * Since there is no other link-local addresses, nd6_prefix_lookup() 434 * probably returns NULL. However, we cannot always expect the result. 435 * For example, if we first remove the (only) existing link-local 436 * address, and then reconfigure another one, the prefix is still 437 * valid with referring to the old link-local address. 438 */ 439 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 440 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) 441 return (error); 442 /* Reference prefix */ 443 ia->ia6_ndpr = pr; 444 pr->ndpr_addrcnt++; 445 } else 446 nd6_prefix_rele(pr); 447 448 return 0; 449 } 450 451 /* 452 * ifp - must be IFT_LOOP 453 */ 454 static int 455 in6_ifattach_loopback(struct ifnet *ifp) 456 { 457 struct in6_aliasreq ifra; 458 int error; 459 460 in6_prepare_ifra(&ifra, &in6addr_loopback, &in6mask128); 461 462 /* 463 * Always initialize ia_dstaddr (= broadcast address) to loopback 464 * address. Follows IPv4 practice - see in_ifinit(). 465 */ 466 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 467 ifra.ifra_dstaddr.sin6_family = AF_INET6; 468 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 469 470 /* the loopback address should NEVER expire. */ 471 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 472 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 473 474 /* 475 * We are sure that this is a newly assigned address, so we can set 476 * NULL to the 3rd arg. 477 */ 478 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 479 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 480 "the loopback address on %s (errno=%d)\n", 481 if_name(ifp), error)); 482 return (-1); 483 } 484 485 return 0; 486 } 487 488 /* 489 * compute NI group address, based on the current hostname setting. 490 * see RFC 4620. 491 * 492 * when ifp == NULL, the caller is responsible for filling scopeid. 493 * 494 * If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address 495 * while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620. 496 */ 497 static int 498 in6_nigroup0(struct ifnet *ifp, const char *name, int namelen, 499 struct in6_addr *in6, int oldmcprefix) 500 { 501 struct prison *pr; 502 const char *p; 503 u_char *q; 504 MD5_CTX ctxt; 505 u_int8_t digest[16]; 506 char l; 507 char n[64]; /* a single label must not exceed 63 chars */ 508 509 /* 510 * If no name is given and namelen is -1, 511 * we try to do the hostname lookup ourselves. 512 */ 513 if (!name && namelen == -1) { 514 pr = curthread->td_ucred->cr_prison; 515 mtx_lock(&pr->pr_mtx); 516 name = pr->pr_hostname; 517 namelen = strlen(name); 518 } else 519 pr = NULL; 520 if (!name || !namelen) { 521 if (pr != NULL) 522 mtx_unlock(&pr->pr_mtx); 523 return -1; 524 } 525 526 p = name; 527 while (p && *p && *p != '.' && p - name < namelen) 528 p++; 529 if (p == name || p - name > sizeof(n) - 1) { 530 if (pr != NULL) 531 mtx_unlock(&pr->pr_mtx); 532 return -1; /* label too long */ 533 } 534 l = p - name; 535 strncpy(n, name, l); 536 if (pr != NULL) 537 mtx_unlock(&pr->pr_mtx); 538 n[(int)l] = '\0'; 539 for (q = n; *q; q++) { 540 if ('A' <= *q && *q <= 'Z') 541 *q = *q - 'A' + 'a'; 542 } 543 544 /* generate 16 bytes of pseudo-random value. */ 545 bzero(&ctxt, sizeof(ctxt)); 546 MD5Init(&ctxt); 547 MD5Update(&ctxt, &l, sizeof(l)); 548 MD5Update(&ctxt, n, l); 549 MD5Final(digest, &ctxt); 550 551 bzero(in6, sizeof(*in6)); 552 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 553 in6->s6_addr8[11] = 2; 554 if (oldmcprefix == 0) { 555 in6->s6_addr8[12] = 0xff; 556 /* Copy the first 24 bits of 128-bit hash into the address. */ 557 bcopy(digest, &in6->s6_addr8[13], 3); 558 } else { 559 /* Copy the first 32 bits of 128-bit hash into the address. */ 560 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 561 } 562 if (in6_setscope(in6, ifp, NULL)) 563 return (-1); /* XXX: should not fail */ 564 565 return 0; 566 } 567 568 int 569 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 570 struct in6_addr *in6) 571 { 572 573 return (in6_nigroup0(ifp, name, namelen, in6, 0)); 574 } 575 576 int 577 in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen, 578 struct in6_addr *in6) 579 { 580 581 return (in6_nigroup0(ifp, name, namelen, in6, 1)); 582 } 583 584 /* 585 * XXX multiple loopback interface needs more care. for instance, 586 * nodelocal address needs to be configured onto only one of them. 587 * XXX multiple link-local address case 588 * 589 * altifp - secondary EUI64 source 590 */ 591 void 592 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 593 { 594 struct in6_ifaddr *ia; 595 596 if (ifp->if_afdata[AF_INET6] == NULL) 597 return; 598 /* 599 * quirks based on interface type 600 */ 601 switch (ifp->if_type) { 602 case IFT_STF: 603 /* 604 * 6to4 interface is a very special kind of beast. 605 * no multicast, no linklocal. RFC2529 specifies how to make 606 * linklocals for 6to4 interface, but there's no use and 607 * it is rather harmful to have one. 608 */ 609 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 610 ND_IFINFO(ifp)->flags |= ND6_IFF_NO_DAD; 611 break; 612 default: 613 break; 614 } 615 616 /* 617 * usually, we require multicast capability to the interface 618 */ 619 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 620 nd6log((LOG_INFO, "in6_ifattach: " 621 "%s is not multicast capable, IPv6 not enabled\n", 622 if_name(ifp))); 623 return; 624 } 625 626 /* 627 * assign loopback address for loopback interface. 628 */ 629 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 630 /* 631 * check that loopback address doesn't exist yet. 632 */ 633 ia = in6ifa_ifwithaddr(&in6addr_loopback, 0, false); 634 if (ia == NULL) 635 in6_ifattach_loopback(ifp); 636 } 637 638 /* 639 * assign a link-local address, if there's none. 640 */ 641 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 642 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 643 struct epoch_tracker et; 644 645 NET_EPOCH_ENTER(et); 646 ia = in6ifa_ifpforlinklocal(ifp, 0); 647 NET_EPOCH_EXIT(et); 648 if (ia == NULL) 649 in6_ifattach_linklocal(ifp, altifp); 650 else 651 ifa_free(&ia->ia_ifa); 652 } 653 } 654 655 /* 656 * NOTE: in6_ifdetach() does not support loopback if at this moment. 657 * 658 * When shutting down a VNET we clean up layers top-down. In that case 659 * upper layer protocols (ulp) are cleaned up already and locks are destroyed 660 * and we must not call into these cleanup functions anymore, thus purgeulp 661 * is set to 0 in that case by in6_ifdetach_destroy(). 662 * The normal case of destroying a (cloned) interface still needs to cleanup 663 * everything related to the interface and will have purgeulp set to 1. 664 */ 665 static void 666 _in6_ifdetach(struct ifnet *ifp, int purgeulp) 667 { 668 struct ifaddr *ifa, *next; 669 670 if (ifp->if_afdata[AF_INET6] == NULL) 671 return; 672 673 /* 674 * nuke any of IPv6 addresses we have 675 */ 676 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 677 if (ifa->ifa_addr->sa_family != AF_INET6) 678 continue; 679 in6_purgeaddr(ifa); 680 } 681 if (purgeulp) { 682 IN6_MULTI_LOCK(); 683 in6_pcbpurgeif0(&V_udbinfo, ifp); 684 in6_pcbpurgeif0(&V_ulitecbinfo, ifp); 685 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 686 IN6_MULTI_UNLOCK(); 687 } 688 /* leave from all multicast groups joined */ 689 in6_purgemaddrs(ifp); 690 691 /* 692 * Remove neighbor management table. 693 * Enabling the nd6_purge will panic on vmove for interfaces on VNET 694 * teardown as the IPv6 layer is cleaned up already and the locks 695 * are destroyed. 696 */ 697 if (purgeulp) 698 nd6_purge(ifp); 699 } 700 701 void 702 in6_ifdetach(struct ifnet *ifp) 703 { 704 705 _in6_ifdetach(ifp, 1); 706 } 707 708 void 709 in6_ifdetach_destroy(struct ifnet *ifp) 710 { 711 712 _in6_ifdetach(ifp, 0); 713 } 714 715 void 716 in6_tmpaddrtimer(void *arg) 717 { 718 CURVNET_SET((struct vnet *) arg); 719 720 callout_reset(&V_in6_tmpaddrtimer_ch, 721 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 722 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 723 724 CURVNET_RESTORE(); 725 } 726 727 static void 728 in6_purgemaddrs(struct ifnet *ifp) 729 { 730 struct in6_multi_head inmh; 731 732 SLIST_INIT(&inmh); 733 IN6_MULTI_LOCK(); 734 IN6_MULTI_LIST_LOCK(); 735 mld_ifdetach(ifp, &inmh); 736 IN6_MULTI_LIST_UNLOCK(); 737 IN6_MULTI_UNLOCK(); 738 in6m_release_list_deferred(&inmh); 739 740 /* 741 * Make sure all multicast deletions invoking if_ioctl() are 742 * completed before returning. Else we risk accessing a freed 743 * ifnet structure pointer. 744 */ 745 in6m_release_wait(NULL); 746 } 747 748 void 749 in6_ifattach_destroy(void) 750 { 751 752 callout_drain(&V_in6_tmpaddrtimer_ch); 753 } 754 755 static void 756 in6_ifattach_init(void *dummy) 757 { 758 759 /* Timer for regeneranation of temporary addresses randomize ID. */ 760 callout_init(&V_in6_tmpaddrtimer_ch, 1); 761 callout_reset(&V_in6_tmpaddrtimer_ch, 762 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 763 V_ip6_temp_regen_advance) * hz, 764 in6_tmpaddrtimer, curvnet); 765 } 766 767 /* 768 * Cheat. 769 * This must be after route_init(), which is now SI_ORDER_THIRD. 770 */ 771 SYSINIT(in6_ifattach_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 772 in6_ifattach_init, NULL); 773