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 in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 87 static int in6_ifattach_loopback(struct ifnet *); 88 static void in6_purgemaddrs(struct ifnet *); 89 90 #define EUI64_GBIT 0x01 91 #define EUI64_UBIT 0x02 92 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 93 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 94 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 95 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 96 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 97 98 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 99 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 100 101 /* 102 * Generate a last-resort interface identifier, when the machine has no 103 * IEEE802/EUI64 address sources. 104 * The goal here is to get an interface identifier that is 105 * (1) random enough and (2) does not change across reboot. 106 * We currently use MD5(hostname) for it. 107 * 108 * in6 - upper 64bits are preserved 109 */ 110 static int 111 get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 112 { 113 MD5_CTX ctxt; 114 struct prison *pr; 115 u_int8_t digest[16]; 116 int hostnamelen; 117 118 pr = curthread->td_ucred->cr_prison; 119 mtx_lock(&pr->pr_mtx); 120 hostnamelen = strlen(pr->pr_hostname); 121 #if 0 122 /* we need at least several letters as seed for ifid */ 123 if (hostnamelen < 3) { 124 mtx_unlock(&pr->pr_mtx); 125 return -1; 126 } 127 #endif 128 129 /* generate 8 bytes of pseudo-random value. */ 130 bzero(&ctxt, sizeof(ctxt)); 131 MD5Init(&ctxt); 132 MD5Update(&ctxt, pr->pr_hostname, hostnamelen); 133 mtx_unlock(&pr->pr_mtx); 134 MD5Final(digest, &ctxt); 135 136 /* assumes sizeof(digest) > sizeof(ifid) */ 137 bcopy(digest, &in6->s6_addr[8], 8); 138 139 /* make sure to set "u" bit to local, and "g" bit to individual. */ 140 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 141 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 142 143 /* convert EUI64 into IPv6 interface identifier */ 144 EUI64_TO_IFID(in6); 145 146 return 0; 147 } 148 149 150 /* 151 * Get interface identifier for the specified interface. 152 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 153 * 154 * in6 - upper 64bits are preserved 155 */ 156 int 157 in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 158 { 159 struct ifaddr *ifa; 160 struct sockaddr_dl *sdl; 161 u_int8_t *addr; 162 size_t addrlen; 163 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 164 static u_int8_t allone[8] = 165 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 166 167 NET_EPOCH_ASSERT(); 168 169 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 170 if (ifa->ifa_addr->sa_family != AF_LINK) 171 continue; 172 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 173 if (sdl == NULL) 174 continue; 175 if (sdl->sdl_alen == 0) 176 continue; 177 178 goto found; 179 } 180 181 return -1; 182 183 found: 184 addr = LLADDR(sdl); 185 addrlen = sdl->sdl_alen; 186 187 /* get EUI64 */ 188 switch (ifp->if_type) { 189 case IFT_BRIDGE: 190 case IFT_ETHER: 191 case IFT_L2VLAN: 192 case IFT_ATM: 193 case IFT_IEEE1394: 194 /* IEEE802/EUI64 cases - what others? */ 195 /* IEEE1394 uses 16byte length address starting with EUI64 */ 196 if (addrlen > 8) 197 addrlen = 8; 198 199 /* look at IEEE802/EUI64 only */ 200 if (addrlen != 8 && addrlen != 6) 201 return -1; 202 203 /* 204 * check for invalid MAC address - on bsdi, we see it a lot 205 * since wildboar configures all-zero MAC on pccard before 206 * card insertion. 207 */ 208 if (bcmp(addr, allzero, addrlen) == 0) 209 return -1; 210 if (bcmp(addr, allone, addrlen) == 0) 211 return -1; 212 213 /* make EUI64 address */ 214 if (addrlen == 8) 215 bcopy(addr, &in6->s6_addr[8], 8); 216 else if (addrlen == 6) { 217 in6->s6_addr[8] = addr[0]; 218 in6->s6_addr[9] = addr[1]; 219 in6->s6_addr[10] = addr[2]; 220 in6->s6_addr[11] = 0xff; 221 in6->s6_addr[12] = 0xfe; 222 in6->s6_addr[13] = addr[3]; 223 in6->s6_addr[14] = addr[4]; 224 in6->s6_addr[15] = addr[5]; 225 } 226 break; 227 228 case IFT_GIF: 229 case IFT_STF: 230 /* 231 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 232 * however, IPv4 address is not very suitable as unique 233 * identifier source (can be renumbered). 234 * we don't do this. 235 */ 236 return -1; 237 238 case IFT_INFINIBAND: 239 if (addrlen != 20) 240 return -1; 241 bcopy(addr + 12, &in6->s6_addr[8], 8); 242 break; 243 244 default: 245 return -1; 246 } 247 248 /* sanity check: g bit must not indicate "group" */ 249 if (EUI64_GROUP(in6)) 250 return -1; 251 252 /* convert EUI64 into IPv6 interface identifier */ 253 EUI64_TO_IFID(in6); 254 255 /* 256 * sanity check: ifid must not be all zero, avoid conflict with 257 * subnet router anycast 258 */ 259 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 260 bcmp(&in6->s6_addr[9], allzero, 7) == 0) 261 return -1; 262 263 return 0; 264 } 265 266 /* 267 * Get interface identifier for the specified interface. If it is not 268 * available on ifp0, borrow interface identifier from other information 269 * sources. 270 * 271 * altifp - secondary EUI64 source 272 */ 273 int 274 in6_get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 275 struct in6_addr *in6) 276 { 277 struct ifnet *ifp; 278 279 NET_EPOCH_ASSERT(); 280 281 /* first, try to get it from the interface itself */ 282 if (in6_get_hw_ifid(ifp0, in6) == 0) { 283 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 284 if_name(ifp0))); 285 goto success; 286 } 287 288 /* try secondary EUI64 source. this basically is for ATM PVC */ 289 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 290 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 291 if_name(ifp0), if_name(altifp))); 292 goto success; 293 } 294 295 /* next, try to get it from some other hardware interface */ 296 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 297 if (ifp == ifp0) 298 continue; 299 if (in6_get_hw_ifid(ifp, in6) != 0) 300 continue; 301 302 /* 303 * to borrow ifid from other interface, ifid needs to be 304 * globally unique 305 */ 306 if (IFID_UNIVERSAL(in6)) { 307 nd6log((LOG_DEBUG, 308 "%s: borrow interface identifier from %s\n", 309 if_name(ifp0), if_name(ifp))); 310 goto success; 311 } 312 } 313 314 /* last resort: get from random number source */ 315 if (get_rand_ifid(ifp, in6) == 0) { 316 nd6log((LOG_DEBUG, 317 "%s: interface identifier generated by random number\n", 318 if_name(ifp0))); 319 goto success; 320 } 321 322 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 323 return -1; 324 325 success: 326 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 327 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 328 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 329 in6->s6_addr[14], in6->s6_addr[15])); 330 return 0; 331 } 332 333 /* 334 * altifp - secondary EUI64 source 335 */ 336 static int 337 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 338 { 339 struct in6_ifaddr *ia; 340 struct in6_aliasreq ifra; 341 struct nd_prefixctl pr0; 342 struct epoch_tracker et; 343 struct nd_prefix *pr; 344 int error; 345 346 /* 347 * configure link-local address. 348 */ 349 in6_prepare_ifra(&ifra, NULL, &in6mask64); 350 351 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 352 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 353 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 354 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 355 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 356 } else { 357 NET_EPOCH_ENTER(et); 358 error = in6_get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr); 359 NET_EPOCH_EXIT(et); 360 if (error != 0) { 361 nd6log((LOG_ERR, 362 "%s: no ifid available\n", if_name(ifp))); 363 return (-1); 364 } 365 } 366 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 367 return (-1); 368 369 /* link-local addresses should NEVER expire. */ 370 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 371 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 372 373 /* 374 * Now call in6_update_ifa() to do a bunch of procedures to configure 375 * a link-local address. We can set the 3rd argument to NULL, because 376 * we know there's no other link-local address on the interface 377 * and therefore we are adding one (instead of updating one). 378 */ 379 if ((error = in6_update_ifa(ifp, &ifra, NULL, 380 IN6_IFAUPDATE_DADDELAY)) != 0) { 381 /* 382 * XXX: When the interface does not support IPv6, this call 383 * would fail in the SIOCSIFADDR ioctl. I believe the 384 * notification is rather confusing in this case, so just 385 * suppress it. (jinmei@kame.net 20010130) 386 */ 387 if (error != EAFNOSUPPORT) 388 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 389 "configure a link-local address on %s " 390 "(errno=%d)\n", 391 if_name(ifp), error)); 392 return (-1); 393 } 394 395 NET_EPOCH_ENTER(et); 396 ia = in6ifa_ifpforlinklocal(ifp, 0); 397 NET_EPOCH_EXIT(et); 398 if (ia == NULL) { 399 /* 400 * Another thread removed the address that we just added. 401 * This should be rare, but it happens. 402 */ 403 nd6log((LOG_NOTICE, "%s: %s: new link-local address " 404 "disappeared\n", __func__, if_name(ifp))); 405 return (-1); 406 } 407 ifa_free(&ia->ia_ifa); 408 409 /* 410 * Make the link-local prefix (fe80::%link/64) as on-link. 411 * Since we'd like to manage prefixes separately from addresses, 412 * we make an ND6 prefix structure for the link-local prefix, 413 * and add it to the prefix list as a never-expire prefix. 414 * XXX: this change might affect some existing code base... 415 */ 416 bzero(&pr0, sizeof(pr0)); 417 pr0.ndpr_ifp = ifp; 418 /* this should be 64 at this moment. */ 419 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 420 pr0.ndpr_prefix = ifra.ifra_addr; 421 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 422 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, &in6mask64); 423 /* 424 * Initialize parameters. The link-local prefix must always be 425 * on-link, and its lifetimes never expire. 426 */ 427 pr0.ndpr_raf_onlink = 1; 428 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 429 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 430 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 431 /* 432 * Since there is no other link-local addresses, nd6_prefix_lookup() 433 * probably returns NULL. However, we cannot always expect the result. 434 * For example, if we first remove the (only) existing link-local 435 * address, and then reconfigure another one, the prefix is still 436 * valid with referring to the old link-local address. 437 */ 438 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 439 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) 440 return (error); 441 /* Reference prefix */ 442 ia->ia6_ndpr = pr; 443 pr->ndpr_addrcnt++; 444 } else 445 nd6_prefix_rele(pr); 446 447 return 0; 448 } 449 450 /* 451 * ifp - must be IFT_LOOP 452 */ 453 static int 454 in6_ifattach_loopback(struct ifnet *ifp) 455 { 456 struct in6_aliasreq ifra; 457 int error; 458 459 in6_prepare_ifra(&ifra, &in6addr_loopback, &in6mask128); 460 461 /* 462 * Always initialize ia_dstaddr (= broadcast address) to loopback 463 * address. Follows IPv4 practice - see in_ifinit(). 464 */ 465 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 466 ifra.ifra_dstaddr.sin6_family = AF_INET6; 467 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 468 469 /* the loopback address should NEVER expire. */ 470 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 471 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 472 473 /* 474 * We are sure that this is a newly assigned address, so we can set 475 * NULL to the 3rd arg. 476 */ 477 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 478 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 479 "the loopback address on %s (errno=%d)\n", 480 if_name(ifp), error)); 481 return (-1); 482 } 483 484 return 0; 485 } 486 487 /* 488 * compute NI group address, based on the current hostname setting. 489 * see RFC 4620. 490 * 491 * when ifp == NULL, the caller is responsible for filling scopeid. 492 * 493 * If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address 494 * while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620. 495 */ 496 static int 497 in6_nigroup0(struct ifnet *ifp, const char *name, int namelen, 498 struct in6_addr *in6, int oldmcprefix) 499 { 500 struct prison *pr; 501 const char *p; 502 u_char *q; 503 MD5_CTX ctxt; 504 u_int8_t digest[16]; 505 char l; 506 char n[64]; /* a single label must not exceed 63 chars */ 507 508 /* 509 * If no name is given and namelen is -1, 510 * we try to do the hostname lookup ourselves. 511 */ 512 if (!name && namelen == -1) { 513 pr = curthread->td_ucred->cr_prison; 514 mtx_lock(&pr->pr_mtx); 515 name = pr->pr_hostname; 516 namelen = strlen(name); 517 } else 518 pr = NULL; 519 if (!name || !namelen) { 520 if (pr != NULL) 521 mtx_unlock(&pr->pr_mtx); 522 return -1; 523 } 524 525 p = name; 526 while (p && *p && *p != '.' && p - name < namelen) 527 p++; 528 if (p == name || p - name > sizeof(n) - 1) { 529 if (pr != NULL) 530 mtx_unlock(&pr->pr_mtx); 531 return -1; /* label too long */ 532 } 533 l = p - name; 534 strncpy(n, name, l); 535 if (pr != NULL) 536 mtx_unlock(&pr->pr_mtx); 537 n[(int)l] = '\0'; 538 for (q = n; *q; q++) { 539 if ('A' <= *q && *q <= 'Z') 540 *q = *q - 'A' + 'a'; 541 } 542 543 /* generate 16 bytes of pseudo-random value. */ 544 bzero(&ctxt, sizeof(ctxt)); 545 MD5Init(&ctxt); 546 MD5Update(&ctxt, &l, sizeof(l)); 547 MD5Update(&ctxt, n, l); 548 MD5Final(digest, &ctxt); 549 550 bzero(in6, sizeof(*in6)); 551 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 552 in6->s6_addr8[11] = 2; 553 if (oldmcprefix == 0) { 554 in6->s6_addr8[12] = 0xff; 555 /* Copy the first 24 bits of 128-bit hash into the address. */ 556 bcopy(digest, &in6->s6_addr8[13], 3); 557 } else { 558 /* Copy the first 32 bits of 128-bit hash into the address. */ 559 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 560 } 561 if (in6_setscope(in6, ifp, NULL)) 562 return (-1); /* XXX: should not fail */ 563 564 return 0; 565 } 566 567 int 568 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 569 struct in6_addr *in6) 570 { 571 572 return (in6_nigroup0(ifp, name, namelen, in6, 0)); 573 } 574 575 int 576 in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen, 577 struct in6_addr *in6) 578 { 579 580 return (in6_nigroup0(ifp, name, namelen, in6, 1)); 581 } 582 583 /* 584 * XXX multiple loopback interface needs more care. for instance, 585 * nodelocal address needs to be configured onto only one of them. 586 * XXX multiple link-local address case 587 * 588 * altifp - secondary EUI64 source 589 */ 590 void 591 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 592 { 593 struct in6_ifaddr *ia; 594 595 if (ifp->if_afdata[AF_INET6] == NULL) 596 return; 597 /* 598 * quirks based on interface type 599 */ 600 switch (ifp->if_type) { 601 case IFT_STF: 602 /* 603 * 6to4 interface is a very special kind of beast. 604 * no multicast, no linklocal. RFC2529 specifies how to make 605 * linklocals for 6to4 interface, but there's no use and 606 * it is rather harmful to have one. 607 */ 608 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 609 ND_IFINFO(ifp)->flags |= ND6_IFF_NO_DAD; 610 break; 611 default: 612 break; 613 } 614 615 /* 616 * usually, we require multicast capability to the interface 617 */ 618 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 619 nd6log((LOG_INFO, "in6_ifattach: " 620 "%s is not multicast capable, IPv6 not enabled\n", 621 if_name(ifp))); 622 return; 623 } 624 625 /* 626 * assign loopback address for loopback interface. 627 */ 628 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 629 /* 630 * check that loopback address doesn't exist yet. 631 */ 632 ia = in6ifa_ifwithaddr(&in6addr_loopback, 0, false); 633 if (ia == NULL) 634 in6_ifattach_loopback(ifp); 635 } 636 637 /* 638 * assign a link-local address, if there's none. 639 */ 640 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 641 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 642 struct epoch_tracker et; 643 644 NET_EPOCH_ENTER(et); 645 ia = in6ifa_ifpforlinklocal(ifp, 0); 646 NET_EPOCH_EXIT(et); 647 if (ia == NULL) 648 in6_ifattach_linklocal(ifp, altifp); 649 else 650 ifa_free(&ia->ia_ifa); 651 } 652 } 653 654 /* 655 * NOTE: in6_ifdetach() does not support loopback if at this moment. 656 * 657 * When shutting down a VNET we clean up layers top-down. In that case 658 * upper layer protocols (ulp) are cleaned up already and locks are destroyed 659 * and we must not call into these cleanup functions anymore, thus purgeulp 660 * is set to 0 in that case by in6_ifdetach_destroy(). 661 * The normal case of destroying a (cloned) interface still needs to cleanup 662 * everything related to the interface and will have purgeulp set to 1. 663 */ 664 static void 665 _in6_ifdetach(struct ifnet *ifp, int purgeulp) 666 { 667 struct ifaddr *ifa, *next; 668 669 if (ifp->if_afdata[AF_INET6] == NULL) 670 return; 671 672 /* 673 * nuke any of IPv6 addresses we have 674 */ 675 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 676 if (ifa->ifa_addr->sa_family != AF_INET6) 677 continue; 678 in6_purgeaddr(ifa); 679 } 680 if (purgeulp) { 681 IN6_MULTI_LOCK(); 682 in6_pcbpurgeif0(&V_udbinfo, ifp); 683 in6_pcbpurgeif0(&V_ulitecbinfo, ifp); 684 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 685 IN6_MULTI_UNLOCK(); 686 } 687 /* leave from all multicast groups joined */ 688 in6_purgemaddrs(ifp); 689 690 /* 691 * Remove neighbor management table. 692 * Enabling the nd6_purge will panic on vmove for interfaces on VNET 693 * teardown as the IPv6 layer is cleaned up already and the locks 694 * are destroyed. 695 */ 696 if (purgeulp) 697 nd6_purge(ifp); 698 } 699 700 void 701 in6_ifdetach(struct ifnet *ifp) 702 { 703 704 _in6_ifdetach(ifp, 1); 705 } 706 707 void 708 in6_ifdetach_destroy(struct ifnet *ifp) 709 { 710 711 _in6_ifdetach(ifp, 0); 712 } 713 714 void 715 in6_tmpaddrtimer(void *arg) 716 { 717 CURVNET_SET((struct vnet *) arg); 718 719 callout_reset(&V_in6_tmpaddrtimer_ch, 720 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 721 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 722 723 CURVNET_RESTORE(); 724 } 725 726 static void 727 in6_purgemaddrs(struct ifnet *ifp) 728 { 729 struct in6_multi_head inmh; 730 731 SLIST_INIT(&inmh); 732 IN6_MULTI_LOCK(); 733 IN6_MULTI_LIST_LOCK(); 734 mld_ifdetach(ifp, &inmh); 735 IN6_MULTI_LIST_UNLOCK(); 736 IN6_MULTI_UNLOCK(); 737 in6m_release_list_deferred(&inmh); 738 739 /* 740 * Make sure all multicast deletions invoking if_ioctl() are 741 * completed before returning. Else we risk accessing a freed 742 * ifnet structure pointer. 743 */ 744 in6m_release_wait(NULL); 745 } 746 747 void 748 in6_ifattach_destroy(void) 749 { 750 751 callout_drain(&V_in6_tmpaddrtimer_ch); 752 } 753 754 static void 755 in6_ifattach_init(void *dummy) 756 { 757 758 /* Timer for regeneranation of temporary addresses randomize ID. */ 759 callout_init(&V_in6_tmpaddrtimer_ch, 1); 760 callout_reset(&V_in6_tmpaddrtimer_ch, 761 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 762 V_ip6_temp_regen_advance) * hz, 763 in6_tmpaddrtimer, curvnet); 764 } 765 766 /* 767 * Cheat. 768 * This must be after route_init(), which is now SI_ORDER_THIRD. 769 */ 770 SYSINIT(in6_ifattach_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 771 in6_ifattach_init, NULL); 772