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 generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 87 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 88 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 89 static int in6_ifattach_loopback(struct ifnet *); 90 static void in6_purgemaddrs(struct ifnet *); 91 92 #define EUI64_GBIT 0x01 93 #define EUI64_UBIT 0x02 94 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 95 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 96 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 97 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 98 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 99 100 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 101 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 102 103 /* 104 * Generate a last-resort interface identifier, when the machine has no 105 * IEEE802/EUI64 address sources. 106 * The goal here is to get an interface identifier that is 107 * (1) random enough and (2) does not change across reboot. 108 * We currently use MD5(hostname) for it. 109 * 110 * in6 - upper 64bits are preserved 111 */ 112 static int 113 get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 114 { 115 MD5_CTX ctxt; 116 struct prison *pr; 117 u_int8_t digest[16]; 118 int hostnamelen; 119 120 pr = curthread->td_ucred->cr_prison; 121 mtx_lock(&pr->pr_mtx); 122 hostnamelen = strlen(pr->pr_hostname); 123 #if 0 124 /* we need at least several letters as seed for ifid */ 125 if (hostnamelen < 3) { 126 mtx_unlock(&pr->pr_mtx); 127 return -1; 128 } 129 #endif 130 131 /* generate 8 bytes of pseudo-random value. */ 132 bzero(&ctxt, sizeof(ctxt)); 133 MD5Init(&ctxt); 134 MD5Update(&ctxt, pr->pr_hostname, hostnamelen); 135 mtx_unlock(&pr->pr_mtx); 136 MD5Final(digest, &ctxt); 137 138 /* assumes sizeof(digest) > sizeof(ifid) */ 139 bcopy(digest, &in6->s6_addr[8], 8); 140 141 /* make sure to set "u" bit to local, and "g" bit to individual. */ 142 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 143 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 144 145 /* convert EUI64 into IPv6 interface identifier */ 146 EUI64_TO_IFID(in6); 147 148 return 0; 149 } 150 151 static int 152 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 153 { 154 MD5_CTX ctxt; 155 u_int8_t seed[16], digest[16], nullbuf[8]; 156 u_int32_t val32; 157 158 /* If there's no history, start with a random seed. */ 159 bzero(nullbuf, sizeof(nullbuf)); 160 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 161 int i; 162 163 for (i = 0; i < 2; i++) { 164 val32 = arc4random(); 165 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 166 } 167 } else 168 bcopy(seed0, seed, 8); 169 170 /* copy the right-most 64-bits of the given address */ 171 /* XXX assumption on the size of IFID */ 172 bcopy(seed1, &seed[8], 8); 173 174 if (0) { /* for debugging purposes only */ 175 int i; 176 177 printf("generate_tmp_ifid: new randomized ID from: "); 178 for (i = 0; i < 16; i++) 179 printf("%02x", seed[i]); 180 printf(" "); 181 } 182 183 /* generate 16 bytes of pseudo-random value. */ 184 bzero(&ctxt, sizeof(ctxt)); 185 MD5Init(&ctxt); 186 MD5Update(&ctxt, seed, sizeof(seed)); 187 MD5Final(digest, &ctxt); 188 189 /* 190 * RFC 3041 3.2.1. (3) 191 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 192 * left-most bit is numbered 0) to zero. 193 */ 194 bcopy(digest, ret, 8); 195 ret[0] &= ~EUI64_UBIT; 196 197 /* 198 * XXX: we'd like to ensure that the generated value is not zero 199 * for simplicity. If the caclculated digest happens to be zero, 200 * use a random non-zero value as the last resort. 201 */ 202 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 203 nd6log((LOG_INFO, 204 "generate_tmp_ifid: computed MD5 value is zero.\n")); 205 206 val32 = arc4random(); 207 val32 = 1 + (val32 % (0xffffffff - 1)); 208 } 209 210 /* 211 * RFC 3041 3.2.1. (4) 212 * Take the rightmost 64-bits of the MD5 digest and save them in 213 * stable storage as the history value to be used in the next 214 * iteration of the algorithm. 215 */ 216 bcopy(&digest[8], seed0, 8); 217 218 if (0) { /* for debugging purposes only */ 219 int i; 220 221 printf("to: "); 222 for (i = 0; i < 16; i++) 223 printf("%02x", digest[i]); 224 printf("\n"); 225 } 226 227 return 0; 228 } 229 230 /* 231 * Get interface identifier for the specified interface. 232 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 233 * 234 * in6 - upper 64bits are preserved 235 */ 236 int 237 in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 238 { 239 struct ifaddr *ifa; 240 struct sockaddr_dl *sdl; 241 u_int8_t *addr; 242 size_t addrlen; 243 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 244 static u_int8_t allone[8] = 245 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 246 247 NET_EPOCH_ASSERT(); 248 249 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 250 if (ifa->ifa_addr->sa_family != AF_LINK) 251 continue; 252 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 253 if (sdl == NULL) 254 continue; 255 if (sdl->sdl_alen == 0) 256 continue; 257 258 goto found; 259 } 260 261 return -1; 262 263 found: 264 addr = LLADDR(sdl); 265 addrlen = sdl->sdl_alen; 266 267 /* get EUI64 */ 268 switch (ifp->if_type) { 269 case IFT_BRIDGE: 270 case IFT_ETHER: 271 case IFT_L2VLAN: 272 case IFT_ATM: 273 case IFT_IEEE1394: 274 /* IEEE802/EUI64 cases - what others? */ 275 /* IEEE1394 uses 16byte length address starting with EUI64 */ 276 if (addrlen > 8) 277 addrlen = 8; 278 279 /* look at IEEE802/EUI64 only */ 280 if (addrlen != 8 && addrlen != 6) 281 return -1; 282 283 /* 284 * check for invalid MAC address - on bsdi, we see it a lot 285 * since wildboar configures all-zero MAC on pccard before 286 * card insertion. 287 */ 288 if (bcmp(addr, allzero, addrlen) == 0) 289 return -1; 290 if (bcmp(addr, allone, addrlen) == 0) 291 return -1; 292 293 /* make EUI64 address */ 294 if (addrlen == 8) 295 bcopy(addr, &in6->s6_addr[8], 8); 296 else if (addrlen == 6) { 297 in6->s6_addr[8] = addr[0]; 298 in6->s6_addr[9] = addr[1]; 299 in6->s6_addr[10] = addr[2]; 300 in6->s6_addr[11] = 0xff; 301 in6->s6_addr[12] = 0xfe; 302 in6->s6_addr[13] = addr[3]; 303 in6->s6_addr[14] = addr[4]; 304 in6->s6_addr[15] = addr[5]; 305 } 306 break; 307 308 case IFT_GIF: 309 case IFT_STF: 310 /* 311 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 312 * however, IPv4 address is not very suitable as unique 313 * identifier source (can be renumbered). 314 * we don't do this. 315 */ 316 return -1; 317 318 case IFT_INFINIBAND: 319 if (addrlen != 20) 320 return -1; 321 bcopy(addr + 12, &in6->s6_addr[8], 8); 322 break; 323 324 default: 325 return -1; 326 } 327 328 /* sanity check: g bit must not indicate "group" */ 329 if (EUI64_GROUP(in6)) 330 return -1; 331 332 /* convert EUI64 into IPv6 interface identifier */ 333 EUI64_TO_IFID(in6); 334 335 /* 336 * sanity check: ifid must not be all zero, avoid conflict with 337 * subnet router anycast 338 */ 339 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 340 bcmp(&in6->s6_addr[9], allzero, 7) == 0) 341 return -1; 342 343 return 0; 344 } 345 346 /* 347 * Get interface identifier for the specified interface. If it is not 348 * available on ifp0, borrow interface identifier from other information 349 * sources. 350 * 351 * altifp - secondary EUI64 source 352 */ 353 static int 354 get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 355 struct in6_addr *in6) 356 { 357 struct ifnet *ifp; 358 359 NET_EPOCH_ASSERT(); 360 361 /* first, try to get it from the interface itself */ 362 if (in6_get_hw_ifid(ifp0, in6) == 0) { 363 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 364 if_name(ifp0))); 365 goto success; 366 } 367 368 /* try secondary EUI64 source. this basically is for ATM PVC */ 369 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 370 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 371 if_name(ifp0), if_name(altifp))); 372 goto success; 373 } 374 375 /* next, try to get it from some other hardware interface */ 376 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 377 if (ifp == ifp0) 378 continue; 379 if (in6_get_hw_ifid(ifp, in6) != 0) 380 continue; 381 382 /* 383 * to borrow ifid from other interface, ifid needs to be 384 * globally unique 385 */ 386 if (IFID_UNIVERSAL(in6)) { 387 nd6log((LOG_DEBUG, 388 "%s: borrow interface identifier from %s\n", 389 if_name(ifp0), if_name(ifp))); 390 goto success; 391 } 392 } 393 394 /* last resort: get from random number source */ 395 if (get_rand_ifid(ifp, in6) == 0) { 396 nd6log((LOG_DEBUG, 397 "%s: interface identifier generated by random number\n", 398 if_name(ifp0))); 399 goto success; 400 } 401 402 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 403 return -1; 404 405 success: 406 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 407 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 408 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 409 in6->s6_addr[14], in6->s6_addr[15])); 410 return 0; 411 } 412 413 /* 414 * altifp - secondary EUI64 source 415 */ 416 static int 417 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 418 { 419 struct in6_ifaddr *ia; 420 struct in6_aliasreq ifra; 421 struct nd_prefixctl pr0; 422 struct epoch_tracker et; 423 struct nd_prefix *pr; 424 int error; 425 426 /* 427 * configure link-local address. 428 */ 429 in6_prepare_ifra(&ifra, NULL, &in6mask64); 430 431 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 432 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 433 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 434 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 435 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 436 } else { 437 NET_EPOCH_ENTER(et); 438 error = get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr); 439 NET_EPOCH_EXIT(et); 440 if (error != 0) { 441 nd6log((LOG_ERR, 442 "%s: no ifid available\n", if_name(ifp))); 443 return (-1); 444 } 445 } 446 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 447 return (-1); 448 449 /* link-local addresses should NEVER expire. */ 450 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 451 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 452 453 /* 454 * Now call in6_update_ifa() to do a bunch of procedures to configure 455 * a link-local address. We can set the 3rd argument to NULL, because 456 * we know there's no other link-local address on the interface 457 * and therefore we are adding one (instead of updating one). 458 */ 459 if ((error = in6_update_ifa(ifp, &ifra, NULL, 460 IN6_IFAUPDATE_DADDELAY)) != 0) { 461 /* 462 * XXX: When the interface does not support IPv6, this call 463 * would fail in the SIOCSIFADDR ioctl. I believe the 464 * notification is rather confusing in this case, so just 465 * suppress it. (jinmei@kame.net 20010130) 466 */ 467 if (error != EAFNOSUPPORT) 468 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 469 "configure a link-local address on %s " 470 "(errno=%d)\n", 471 if_name(ifp), error)); 472 return (-1); 473 } 474 475 NET_EPOCH_ENTER(et); 476 ia = in6ifa_ifpforlinklocal(ifp, 0); 477 NET_EPOCH_EXIT(et); 478 if (ia == NULL) { 479 /* 480 * Another thread removed the address that we just added. 481 * This should be rare, but it happens. 482 */ 483 nd6log((LOG_NOTICE, "%s: %s: new link-local address " 484 "disappeared\n", __func__, if_name(ifp))); 485 return (-1); 486 } 487 ifa_free(&ia->ia_ifa); 488 489 /* 490 * Make the link-local prefix (fe80::%link/64) as on-link. 491 * Since we'd like to manage prefixes separately from addresses, 492 * we make an ND6 prefix structure for the link-local prefix, 493 * and add it to the prefix list as a never-expire prefix. 494 * XXX: this change might affect some existing code base... 495 */ 496 bzero(&pr0, sizeof(pr0)); 497 pr0.ndpr_ifp = ifp; 498 /* this should be 64 at this moment. */ 499 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 500 pr0.ndpr_prefix = ifra.ifra_addr; 501 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 502 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, &in6mask64); 503 /* 504 * Initialize parameters. The link-local prefix must always be 505 * on-link, and its lifetimes never expire. 506 */ 507 pr0.ndpr_raf_onlink = 1; 508 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 509 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 510 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 511 /* 512 * Since there is no other link-local addresses, nd6_prefix_lookup() 513 * probably returns NULL. However, we cannot always expect the result. 514 * For example, if we first remove the (only) existing link-local 515 * address, and then reconfigure another one, the prefix is still 516 * valid with referring to the old link-local address. 517 */ 518 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 519 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) 520 return (error); 521 /* Reference prefix */ 522 ia->ia6_ndpr = pr; 523 pr->ndpr_addrcnt++; 524 } else 525 nd6_prefix_rele(pr); 526 527 return 0; 528 } 529 530 /* 531 * ifp - must be IFT_LOOP 532 */ 533 static int 534 in6_ifattach_loopback(struct ifnet *ifp) 535 { 536 struct in6_aliasreq ifra; 537 int error; 538 539 in6_prepare_ifra(&ifra, &in6addr_loopback, &in6mask128); 540 541 /* 542 * Always initialize ia_dstaddr (= broadcast address) to loopback 543 * address. Follows IPv4 practice - see in_ifinit(). 544 */ 545 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 546 ifra.ifra_dstaddr.sin6_family = AF_INET6; 547 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 548 549 /* the loopback address should NEVER expire. */ 550 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 551 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 552 553 /* 554 * We are sure that this is a newly assigned address, so we can set 555 * NULL to the 3rd arg. 556 */ 557 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 558 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 559 "the loopback address on %s (errno=%d)\n", 560 if_name(ifp), error)); 561 return (-1); 562 } 563 564 return 0; 565 } 566 567 /* 568 * compute NI group address, based on the current hostname setting. 569 * see RFC 4620. 570 * 571 * when ifp == NULL, the caller is responsible for filling scopeid. 572 * 573 * If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address 574 * while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620. 575 */ 576 static int 577 in6_nigroup0(struct ifnet *ifp, const char *name, int namelen, 578 struct in6_addr *in6, int oldmcprefix) 579 { 580 struct prison *pr; 581 const char *p; 582 u_char *q; 583 MD5_CTX ctxt; 584 u_int8_t digest[16]; 585 char l; 586 char n[64]; /* a single label must not exceed 63 chars */ 587 588 /* 589 * If no name is given and namelen is -1, 590 * we try to do the hostname lookup ourselves. 591 */ 592 if (!name && namelen == -1) { 593 pr = curthread->td_ucred->cr_prison; 594 mtx_lock(&pr->pr_mtx); 595 name = pr->pr_hostname; 596 namelen = strlen(name); 597 } else 598 pr = NULL; 599 if (!name || !namelen) { 600 if (pr != NULL) 601 mtx_unlock(&pr->pr_mtx); 602 return -1; 603 } 604 605 p = name; 606 while (p && *p && *p != '.' && p - name < namelen) 607 p++; 608 if (p == name || p - name > sizeof(n) - 1) { 609 if (pr != NULL) 610 mtx_unlock(&pr->pr_mtx); 611 return -1; /* label too long */ 612 } 613 l = p - name; 614 strncpy(n, name, l); 615 if (pr != NULL) 616 mtx_unlock(&pr->pr_mtx); 617 n[(int)l] = '\0'; 618 for (q = n; *q; q++) { 619 if ('A' <= *q && *q <= 'Z') 620 *q = *q - 'A' + 'a'; 621 } 622 623 /* generate 16 bytes of pseudo-random value. */ 624 bzero(&ctxt, sizeof(ctxt)); 625 MD5Init(&ctxt); 626 MD5Update(&ctxt, &l, sizeof(l)); 627 MD5Update(&ctxt, n, l); 628 MD5Final(digest, &ctxt); 629 630 bzero(in6, sizeof(*in6)); 631 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 632 in6->s6_addr8[11] = 2; 633 if (oldmcprefix == 0) { 634 in6->s6_addr8[12] = 0xff; 635 /* Copy the first 24 bits of 128-bit hash into the address. */ 636 bcopy(digest, &in6->s6_addr8[13], 3); 637 } else { 638 /* Copy the first 32 bits of 128-bit hash into the address. */ 639 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 640 } 641 if (in6_setscope(in6, ifp, NULL)) 642 return (-1); /* XXX: should not fail */ 643 644 return 0; 645 } 646 647 int 648 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 649 struct in6_addr *in6) 650 { 651 652 return (in6_nigroup0(ifp, name, namelen, in6, 0)); 653 } 654 655 int 656 in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen, 657 struct in6_addr *in6) 658 { 659 660 return (in6_nigroup0(ifp, name, namelen, in6, 1)); 661 } 662 663 /* 664 * XXX multiple loopback interface needs more care. for instance, 665 * nodelocal address needs to be configured onto only one of them. 666 * XXX multiple link-local address case 667 * 668 * altifp - secondary EUI64 source 669 */ 670 void 671 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 672 { 673 struct in6_ifaddr *ia; 674 675 if (ifp->if_afdata[AF_INET6] == NULL) 676 return; 677 /* 678 * quirks based on interface type 679 */ 680 switch (ifp->if_type) { 681 case IFT_STF: 682 /* 683 * 6to4 interface is a very special kind of beast. 684 * no multicast, no linklocal. RFC2529 specifies how to make 685 * linklocals for 6to4 interface, but there's no use and 686 * it is rather harmful to have one. 687 */ 688 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 689 ND_IFINFO(ifp)->flags |= ND6_IFF_NO_DAD; 690 break; 691 default: 692 break; 693 } 694 695 /* 696 * usually, we require multicast capability to the interface 697 */ 698 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 699 nd6log((LOG_INFO, "in6_ifattach: " 700 "%s is not multicast capable, IPv6 not enabled\n", 701 if_name(ifp))); 702 return; 703 } 704 705 /* 706 * assign loopback address for loopback interface. 707 */ 708 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 709 /* 710 * check that loopback address doesn't exist yet. 711 */ 712 ia = in6ifa_ifwithaddr(&in6addr_loopback, 0, false); 713 if (ia == NULL) 714 in6_ifattach_loopback(ifp); 715 } 716 717 /* 718 * assign a link-local address, if there's none. 719 */ 720 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 721 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 722 struct epoch_tracker et; 723 724 NET_EPOCH_ENTER(et); 725 ia = in6ifa_ifpforlinklocal(ifp, 0); 726 NET_EPOCH_EXIT(et); 727 if (ia == NULL) 728 in6_ifattach_linklocal(ifp, altifp); 729 else 730 ifa_free(&ia->ia_ifa); 731 } 732 } 733 734 /* 735 * NOTE: in6_ifdetach() does not support loopback if at this moment. 736 * 737 * When shutting down a VNET we clean up layers top-down. In that case 738 * upper layer protocols (ulp) are cleaned up already and locks are destroyed 739 * and we must not call into these cleanup functions anymore, thus purgeulp 740 * is set to 0 in that case by in6_ifdetach_destroy(). 741 * The normal case of destroying a (cloned) interface still needs to cleanup 742 * everything related to the interface and will have purgeulp set to 1. 743 */ 744 static void 745 _in6_ifdetach(struct ifnet *ifp, int purgeulp) 746 { 747 struct ifaddr *ifa, *next; 748 749 if (ifp->if_afdata[AF_INET6] == NULL) 750 return; 751 752 /* 753 * nuke any of IPv6 addresses we have 754 */ 755 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 756 if (ifa->ifa_addr->sa_family != AF_INET6) 757 continue; 758 in6_purgeaddr(ifa); 759 } 760 if (purgeulp) { 761 IN6_MULTI_LOCK(); 762 in6_pcbpurgeif0(&V_udbinfo, ifp); 763 in6_pcbpurgeif0(&V_ulitecbinfo, ifp); 764 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 765 IN6_MULTI_UNLOCK(); 766 } 767 /* leave from all multicast groups joined */ 768 in6_purgemaddrs(ifp); 769 770 /* 771 * Remove neighbor management table. 772 * Enabling the nd6_purge will panic on vmove for interfaces on VNET 773 * teardown as the IPv6 layer is cleaned up already and the locks 774 * are destroyed. 775 */ 776 if (purgeulp) 777 nd6_purge(ifp); 778 } 779 780 void 781 in6_ifdetach(struct ifnet *ifp) 782 { 783 784 _in6_ifdetach(ifp, 1); 785 } 786 787 void 788 in6_ifdetach_destroy(struct ifnet *ifp) 789 { 790 791 _in6_ifdetach(ifp, 0); 792 } 793 794 int 795 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 796 const u_int8_t *baseid, int generate) 797 { 798 u_int8_t nullbuf[8]; 799 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 800 801 bzero(nullbuf, sizeof(nullbuf)); 802 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 803 /* we've never created a random ID. Create a new one. */ 804 generate = 1; 805 } 806 807 if (generate) { 808 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 809 810 /* generate_tmp_ifid will update seedn and buf */ 811 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 812 ndi->randomid); 813 } 814 bcopy(ndi->randomid, retbuf, 8); 815 816 return (0); 817 } 818 819 void 820 in6_tmpaddrtimer(void *arg) 821 { 822 CURVNET_SET((struct vnet *) arg); 823 struct epoch_tracker et; 824 struct nd_ifinfo *ndi; 825 u_int8_t nullbuf[8]; 826 struct ifnet *ifp; 827 828 callout_reset(&V_in6_tmpaddrtimer_ch, 829 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 830 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 831 832 bzero(nullbuf, sizeof(nullbuf)); 833 NET_EPOCH_ENTER(et); 834 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 835 if (ifp->if_afdata[AF_INET6] == NULL) 836 continue; 837 ndi = ND_IFINFO(ifp); 838 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 839 /* 840 * We've been generating a random ID on this interface. 841 * Create a new one. 842 */ 843 (void)generate_tmp_ifid(ndi->randomseed0, 844 ndi->randomseed1, ndi->randomid); 845 } 846 } 847 NET_EPOCH_EXIT(et); 848 CURVNET_RESTORE(); 849 } 850 851 static void 852 in6_purgemaddrs(struct ifnet *ifp) 853 { 854 struct in6_multi_head inmh; 855 856 SLIST_INIT(&inmh); 857 IN6_MULTI_LOCK(); 858 IN6_MULTI_LIST_LOCK(); 859 mld_ifdetach(ifp, &inmh); 860 IN6_MULTI_LIST_UNLOCK(); 861 IN6_MULTI_UNLOCK(); 862 in6m_release_list_deferred(&inmh); 863 864 /* 865 * Make sure all multicast deletions invoking if_ioctl() are 866 * completed before returning. Else we risk accessing a freed 867 * ifnet structure pointer. 868 */ 869 in6m_release_wait(NULL); 870 } 871 872 void 873 in6_ifattach_destroy(void) 874 { 875 876 callout_drain(&V_in6_tmpaddrtimer_ch); 877 } 878 879 static void 880 in6_ifattach_init(void *dummy) 881 { 882 883 /* Timer for regeneranation of temporary addresses randomize ID. */ 884 callout_init(&V_in6_tmpaddrtimer_ch, 1); 885 callout_reset(&V_in6_tmpaddrtimer_ch, 886 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 887 V_ip6_temp_regen_advance) * hz, 888 in6_tmpaddrtimer, curvnet); 889 } 890 891 /* 892 * Cheat. 893 * This must be after route_init(), which is now SI_ORDER_THIRD. 894 */ 895 SYSINIT(in6_ifattach_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 896 in6_ifattach_init, NULL); 897