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 VNET_DEFINE(unsigned long, in6_maxmtu) = 0; 74 75 #ifdef IP6_AUTO_LINKLOCAL 76 VNET_DEFINE(int, ip6_auto_linklocal) = IP6_AUTO_LINKLOCAL; 77 #else 78 VNET_DEFINE(int, ip6_auto_linklocal) = 1; /* enabled by default */ 79 #endif 80 81 VNET_DEFINE(struct callout, in6_tmpaddrtimer_ch); 82 #define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch) 83 84 VNET_DECLARE(struct inpcbinfo, ripcbinfo); 85 #define V_ripcbinfo VNET(ripcbinfo) 86 87 static int get_rand_ifid(struct ifnet *, struct in6_addr *); 88 static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 89 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 90 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 91 static int in6_ifattach_loopback(struct ifnet *); 92 static void in6_purgemaddrs(struct ifnet *); 93 94 #define EUI64_GBIT 0x01 95 #define EUI64_UBIT 0x02 96 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 97 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 98 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 99 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 100 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 101 102 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 103 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 104 105 /* 106 * Generate a last-resort interface identifier, when the machine has no 107 * IEEE802/EUI64 address sources. 108 * The goal here is to get an interface identifier that is 109 * (1) random enough and (2) does not change across reboot. 110 * We currently use MD5(hostname) for it. 111 * 112 * in6 - upper 64bits are preserved 113 */ 114 static int 115 get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 116 { 117 MD5_CTX ctxt; 118 struct prison *pr; 119 u_int8_t digest[16]; 120 int hostnamelen; 121 122 pr = curthread->td_ucred->cr_prison; 123 mtx_lock(&pr->pr_mtx); 124 hostnamelen = strlen(pr->pr_hostname); 125 #if 0 126 /* we need at least several letters as seed for ifid */ 127 if (hostnamelen < 3) { 128 mtx_unlock(&pr->pr_mtx); 129 return -1; 130 } 131 #endif 132 133 /* generate 8 bytes of pseudo-random value. */ 134 bzero(&ctxt, sizeof(ctxt)); 135 MD5Init(&ctxt); 136 MD5Update(&ctxt, pr->pr_hostname, hostnamelen); 137 mtx_unlock(&pr->pr_mtx); 138 MD5Final(digest, &ctxt); 139 140 /* assumes sizeof(digest) > sizeof(ifid) */ 141 bcopy(digest, &in6->s6_addr[8], 8); 142 143 /* make sure to set "u" bit to local, and "g" bit to individual. */ 144 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 145 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 146 147 /* convert EUI64 into IPv6 interface identifier */ 148 EUI64_TO_IFID(in6); 149 150 return 0; 151 } 152 153 static int 154 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 155 { 156 MD5_CTX ctxt; 157 u_int8_t seed[16], digest[16], nullbuf[8]; 158 u_int32_t val32; 159 160 /* If there's no history, start with a random seed. */ 161 bzero(nullbuf, sizeof(nullbuf)); 162 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 163 int i; 164 165 for (i = 0; i < 2; i++) { 166 val32 = arc4random(); 167 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 168 } 169 } else 170 bcopy(seed0, seed, 8); 171 172 /* copy the right-most 64-bits of the given address */ 173 /* XXX assumption on the size of IFID */ 174 bcopy(seed1, &seed[8], 8); 175 176 if (0) { /* for debugging purposes only */ 177 int i; 178 179 printf("generate_tmp_ifid: new randomized ID from: "); 180 for (i = 0; i < 16; i++) 181 printf("%02x", seed[i]); 182 printf(" "); 183 } 184 185 /* generate 16 bytes of pseudo-random value. */ 186 bzero(&ctxt, sizeof(ctxt)); 187 MD5Init(&ctxt); 188 MD5Update(&ctxt, seed, sizeof(seed)); 189 MD5Final(digest, &ctxt); 190 191 /* 192 * RFC 3041 3.2.1. (3) 193 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 194 * left-most bit is numbered 0) to zero. 195 */ 196 bcopy(digest, ret, 8); 197 ret[0] &= ~EUI64_UBIT; 198 199 /* 200 * XXX: we'd like to ensure that the generated value is not zero 201 * for simplicity. If the caclculated digest happens to be zero, 202 * use a random non-zero value as the last resort. 203 */ 204 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 205 nd6log((LOG_INFO, 206 "generate_tmp_ifid: computed MD5 value is zero.\n")); 207 208 val32 = arc4random(); 209 val32 = 1 + (val32 % (0xffffffff - 1)); 210 } 211 212 /* 213 * RFC 3041 3.2.1. (4) 214 * Take the rightmost 64-bits of the MD5 digest and save them in 215 * stable storage as the history value to be used in the next 216 * iteration of the algorithm. 217 */ 218 bcopy(&digest[8], seed0, 8); 219 220 if (0) { /* for debugging purposes only */ 221 int i; 222 223 printf("to: "); 224 for (i = 0; i < 16; i++) 225 printf("%02x", digest[i]); 226 printf("\n"); 227 } 228 229 return 0; 230 } 231 232 /* 233 * Get interface identifier for the specified interface. 234 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 235 * 236 * in6 - upper 64bits are preserved 237 */ 238 int 239 in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 240 { 241 struct ifaddr *ifa; 242 struct sockaddr_dl *sdl; 243 u_int8_t *addr; 244 size_t addrlen; 245 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 246 static u_int8_t allone[8] = 247 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 248 249 NET_EPOCH_ASSERT(); 250 251 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 252 if (ifa->ifa_addr->sa_family != AF_LINK) 253 continue; 254 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 255 if (sdl == NULL) 256 continue; 257 if (sdl->sdl_alen == 0) 258 continue; 259 260 goto found; 261 } 262 263 return -1; 264 265 found: 266 addr = LLADDR(sdl); 267 addrlen = sdl->sdl_alen; 268 269 /* get EUI64 */ 270 switch (ifp->if_type) { 271 case IFT_BRIDGE: 272 case IFT_ETHER: 273 case IFT_L2VLAN: 274 case IFT_ATM: 275 case IFT_IEEE1394: 276 /* IEEE802/EUI64 cases - what others? */ 277 /* IEEE1394 uses 16byte length address starting with EUI64 */ 278 if (addrlen > 8) 279 addrlen = 8; 280 281 /* look at IEEE802/EUI64 only */ 282 if (addrlen != 8 && addrlen != 6) 283 return -1; 284 285 /* 286 * check for invalid MAC address - on bsdi, we see it a lot 287 * since wildboar configures all-zero MAC on pccard before 288 * card insertion. 289 */ 290 if (bcmp(addr, allzero, addrlen) == 0) 291 return -1; 292 if (bcmp(addr, allone, addrlen) == 0) 293 return -1; 294 295 /* make EUI64 address */ 296 if (addrlen == 8) 297 bcopy(addr, &in6->s6_addr[8], 8); 298 else if (addrlen == 6) { 299 in6->s6_addr[8] = addr[0]; 300 in6->s6_addr[9] = addr[1]; 301 in6->s6_addr[10] = addr[2]; 302 in6->s6_addr[11] = 0xff; 303 in6->s6_addr[12] = 0xfe; 304 in6->s6_addr[13] = addr[3]; 305 in6->s6_addr[14] = addr[4]; 306 in6->s6_addr[15] = addr[5]; 307 } 308 break; 309 310 case IFT_GIF: 311 case IFT_STF: 312 /* 313 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 314 * however, IPv4 address is not very suitable as unique 315 * identifier source (can be renumbered). 316 * we don't do this. 317 */ 318 return -1; 319 320 case IFT_INFINIBAND: 321 if (addrlen != 20) 322 return -1; 323 bcopy(addr + 12, &in6->s6_addr[8], 8); 324 break; 325 326 default: 327 return -1; 328 } 329 330 /* sanity check: g bit must not indicate "group" */ 331 if (EUI64_GROUP(in6)) 332 return -1; 333 334 /* convert EUI64 into IPv6 interface identifier */ 335 EUI64_TO_IFID(in6); 336 337 /* 338 * sanity check: ifid must not be all zero, avoid conflict with 339 * subnet router anycast 340 */ 341 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 342 bcmp(&in6->s6_addr[9], allzero, 7) == 0) 343 return -1; 344 345 return 0; 346 } 347 348 /* 349 * Get interface identifier for the specified interface. If it is not 350 * available on ifp0, borrow interface identifier from other information 351 * sources. 352 * 353 * altifp - secondary EUI64 source 354 */ 355 static int 356 get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 357 struct in6_addr *in6) 358 { 359 struct ifnet *ifp; 360 361 NET_EPOCH_ASSERT(); 362 363 /* first, try to get it from the interface itself */ 364 if (in6_get_hw_ifid(ifp0, in6) == 0) { 365 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 366 if_name(ifp0))); 367 goto success; 368 } 369 370 /* try secondary EUI64 source. this basically is for ATM PVC */ 371 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 372 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 373 if_name(ifp0), if_name(altifp))); 374 goto success; 375 } 376 377 /* next, try to get it from some other hardware interface */ 378 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 379 if (ifp == ifp0) 380 continue; 381 if (in6_get_hw_ifid(ifp, in6) != 0) 382 continue; 383 384 /* 385 * to borrow ifid from other interface, ifid needs to be 386 * globally unique 387 */ 388 if (IFID_UNIVERSAL(in6)) { 389 nd6log((LOG_DEBUG, 390 "%s: borrow interface identifier from %s\n", 391 if_name(ifp0), if_name(ifp))); 392 goto success; 393 } 394 } 395 396 /* last resort: get from random number source */ 397 if (get_rand_ifid(ifp, in6) == 0) { 398 nd6log((LOG_DEBUG, 399 "%s: interface identifier generated by random number\n", 400 if_name(ifp0))); 401 goto success; 402 } 403 404 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 405 return -1; 406 407 success: 408 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 409 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 410 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 411 in6->s6_addr[14], in6->s6_addr[15])); 412 return 0; 413 } 414 415 /* 416 * altifp - secondary EUI64 source 417 */ 418 static int 419 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 420 { 421 struct in6_ifaddr *ia; 422 struct in6_aliasreq ifra; 423 struct nd_prefixctl pr0; 424 struct epoch_tracker et; 425 struct nd_prefix *pr; 426 int error; 427 428 /* 429 * configure link-local address. 430 */ 431 in6_prepare_ifra(&ifra, NULL, &in6mask64); 432 433 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 434 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 435 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 436 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 437 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 438 } else { 439 NET_EPOCH_ENTER(et); 440 error = get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr); 441 NET_EPOCH_EXIT(et); 442 if (error != 0) { 443 nd6log((LOG_ERR, 444 "%s: no ifid available\n", if_name(ifp))); 445 return (-1); 446 } 447 } 448 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 449 return (-1); 450 451 /* link-local addresses should NEVER expire. */ 452 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 453 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 454 455 /* 456 * Now call in6_update_ifa() to do a bunch of procedures to configure 457 * a link-local address. We can set the 3rd argument to NULL, because 458 * we know there's no other link-local address on the interface 459 * and therefore we are adding one (instead of updating one). 460 */ 461 if ((error = in6_update_ifa(ifp, &ifra, NULL, 462 IN6_IFAUPDATE_DADDELAY)) != 0) { 463 /* 464 * XXX: When the interface does not support IPv6, this call 465 * would fail in the SIOCSIFADDR ioctl. I believe the 466 * notification is rather confusing in this case, so just 467 * suppress it. (jinmei@kame.net 20010130) 468 */ 469 if (error != EAFNOSUPPORT) 470 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 471 "configure a link-local address on %s " 472 "(errno=%d)\n", 473 if_name(ifp), error)); 474 return (-1); 475 } 476 477 NET_EPOCH_ENTER(et); 478 ia = in6ifa_ifpforlinklocal(ifp, 0); 479 NET_EPOCH_EXIT(et); 480 if (ia == NULL) { 481 /* 482 * Another thread removed the address that we just added. 483 * This should be rare, but it happens. 484 */ 485 nd6log((LOG_NOTICE, "%s: %s: new link-local address " 486 "disappeared\n", __func__, if_name(ifp))); 487 return (-1); 488 } 489 ifa_free(&ia->ia_ifa); 490 491 /* 492 * Make the link-local prefix (fe80::%link/64) as on-link. 493 * Since we'd like to manage prefixes separately from addresses, 494 * we make an ND6 prefix structure for the link-local prefix, 495 * and add it to the prefix list as a never-expire prefix. 496 * XXX: this change might affect some existing code base... 497 */ 498 bzero(&pr0, sizeof(pr0)); 499 pr0.ndpr_ifp = ifp; 500 /* this should be 64 at this moment. */ 501 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 502 pr0.ndpr_prefix = ifra.ifra_addr; 503 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 504 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, &in6mask64); 505 /* 506 * Initialize parameters. The link-local prefix must always be 507 * on-link, and its lifetimes never expire. 508 */ 509 pr0.ndpr_raf_onlink = 1; 510 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 511 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 512 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 513 /* 514 * Since there is no other link-local addresses, nd6_prefix_lookup() 515 * probably returns NULL. However, we cannot always expect the result. 516 * For example, if we first remove the (only) existing link-local 517 * address, and then reconfigure another one, the prefix is still 518 * valid with referring to the old link-local address. 519 */ 520 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 521 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) 522 return (error); 523 /* Reference prefix */ 524 ia->ia6_ndpr = pr; 525 pr->ndpr_addrcnt++; 526 } else 527 nd6_prefix_rele(pr); 528 529 return 0; 530 } 531 532 /* 533 * ifp - must be IFT_LOOP 534 */ 535 static int 536 in6_ifattach_loopback(struct ifnet *ifp) 537 { 538 struct in6_aliasreq ifra; 539 int error; 540 541 in6_prepare_ifra(&ifra, &in6addr_loopback, &in6mask128); 542 543 /* 544 * Always initialize ia_dstaddr (= broadcast address) to loopback 545 * address. Follows IPv4 practice - see in_ifinit(). 546 */ 547 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 548 ifra.ifra_dstaddr.sin6_family = AF_INET6; 549 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 550 551 /* the loopback address should NEVER expire. */ 552 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 553 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 554 555 /* 556 * We are sure that this is a newly assigned address, so we can set 557 * NULL to the 3rd arg. 558 */ 559 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 560 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 561 "the loopback address on %s (errno=%d)\n", 562 if_name(ifp), error)); 563 return (-1); 564 } 565 566 return 0; 567 } 568 569 /* 570 * compute NI group address, based on the current hostname setting. 571 * see RFC 4620. 572 * 573 * when ifp == NULL, the caller is responsible for filling scopeid. 574 * 575 * If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address 576 * while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620. 577 */ 578 static int 579 in6_nigroup0(struct ifnet *ifp, const char *name, int namelen, 580 struct in6_addr *in6, int oldmcprefix) 581 { 582 struct prison *pr; 583 const char *p; 584 u_char *q; 585 MD5_CTX ctxt; 586 u_int8_t digest[16]; 587 char l; 588 char n[64]; /* a single label must not exceed 63 chars */ 589 590 /* 591 * If no name is given and namelen is -1, 592 * we try to do the hostname lookup ourselves. 593 */ 594 if (!name && namelen == -1) { 595 pr = curthread->td_ucred->cr_prison; 596 mtx_lock(&pr->pr_mtx); 597 name = pr->pr_hostname; 598 namelen = strlen(name); 599 } else 600 pr = NULL; 601 if (!name || !namelen) { 602 if (pr != NULL) 603 mtx_unlock(&pr->pr_mtx); 604 return -1; 605 } 606 607 p = name; 608 while (p && *p && *p != '.' && p - name < namelen) 609 p++; 610 if (p == name || p - name > sizeof(n) - 1) { 611 if (pr != NULL) 612 mtx_unlock(&pr->pr_mtx); 613 return -1; /* label too long */ 614 } 615 l = p - name; 616 strncpy(n, name, l); 617 if (pr != NULL) 618 mtx_unlock(&pr->pr_mtx); 619 n[(int)l] = '\0'; 620 for (q = n; *q; q++) { 621 if ('A' <= *q && *q <= 'Z') 622 *q = *q - 'A' + 'a'; 623 } 624 625 /* generate 16 bytes of pseudo-random value. */ 626 bzero(&ctxt, sizeof(ctxt)); 627 MD5Init(&ctxt); 628 MD5Update(&ctxt, &l, sizeof(l)); 629 MD5Update(&ctxt, n, l); 630 MD5Final(digest, &ctxt); 631 632 bzero(in6, sizeof(*in6)); 633 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 634 in6->s6_addr8[11] = 2; 635 if (oldmcprefix == 0) { 636 in6->s6_addr8[12] = 0xff; 637 /* Copy the first 24 bits of 128-bit hash into the address. */ 638 bcopy(digest, &in6->s6_addr8[13], 3); 639 } else { 640 /* Copy the first 32 bits of 128-bit hash into the address. */ 641 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 642 } 643 if (in6_setscope(in6, ifp, NULL)) 644 return (-1); /* XXX: should not fail */ 645 646 return 0; 647 } 648 649 int 650 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 651 struct in6_addr *in6) 652 { 653 654 return (in6_nigroup0(ifp, name, namelen, in6, 0)); 655 } 656 657 int 658 in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen, 659 struct in6_addr *in6) 660 { 661 662 return (in6_nigroup0(ifp, name, namelen, in6, 1)); 663 } 664 665 /* 666 * XXX multiple loopback interface needs more care. for instance, 667 * nodelocal address needs to be configured onto only one of them. 668 * XXX multiple link-local address case 669 * 670 * altifp - secondary EUI64 source 671 */ 672 void 673 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 674 { 675 struct in6_ifaddr *ia; 676 677 if (ifp->if_afdata[AF_INET6] == NULL) 678 return; 679 /* 680 * quirks based on interface type 681 */ 682 switch (ifp->if_type) { 683 case IFT_STF: 684 /* 685 * 6to4 interface is a very special kind of beast. 686 * no multicast, no linklocal. RFC2529 specifies how to make 687 * linklocals for 6to4 interface, but there's no use and 688 * it is rather harmful to have one. 689 */ 690 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 691 ND_IFINFO(ifp)->flags |= ND6_IFF_NO_DAD; 692 break; 693 default: 694 break; 695 } 696 697 /* 698 * usually, we require multicast capability to the interface 699 */ 700 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 701 nd6log((LOG_INFO, "in6_ifattach: " 702 "%s is not multicast capable, IPv6 not enabled\n", 703 if_name(ifp))); 704 return; 705 } 706 707 /* 708 * assign loopback address for loopback interface. 709 */ 710 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 711 /* 712 * check that loopback address doesn't exist yet. 713 */ 714 ia = in6ifa_ifwithaddr(&in6addr_loopback, 0, false); 715 if (ia == NULL) 716 in6_ifattach_loopback(ifp); 717 } 718 719 /* 720 * assign a link-local address, if there's none. 721 */ 722 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 723 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 724 struct epoch_tracker et; 725 726 NET_EPOCH_ENTER(et); 727 ia = in6ifa_ifpforlinklocal(ifp, 0); 728 NET_EPOCH_EXIT(et); 729 if (ia == NULL) 730 in6_ifattach_linklocal(ifp, altifp); 731 else 732 ifa_free(&ia->ia_ifa); 733 } 734 735 /* update dynamically. */ 736 if (V_in6_maxmtu < ifp->if_mtu) 737 V_in6_maxmtu = ifp->if_mtu; 738 } 739 740 /* 741 * NOTE: in6_ifdetach() does not support loopback if at this moment. 742 * 743 * When shutting down a VNET we clean up layers top-down. In that case 744 * upper layer protocols (ulp) are cleaned up already and locks are destroyed 745 * and we must not call into these cleanup functions anymore, thus purgeulp 746 * is set to 0 in that case by in6_ifdetach_destroy(). 747 * The normal case of destroying a (cloned) interface still needs to cleanup 748 * everything related to the interface and will have purgeulp set to 1. 749 */ 750 static void 751 _in6_ifdetach(struct ifnet *ifp, int purgeulp) 752 { 753 struct ifaddr *ifa, *next; 754 755 if (ifp->if_afdata[AF_INET6] == NULL) 756 return; 757 758 /* 759 * nuke any of IPv6 addresses we have 760 */ 761 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 762 if (ifa->ifa_addr->sa_family != AF_INET6) 763 continue; 764 in6_purgeaddr(ifa); 765 } 766 if (purgeulp) { 767 IN6_MULTI_LOCK(); 768 in6_pcbpurgeif0(&V_udbinfo, ifp); 769 in6_pcbpurgeif0(&V_ulitecbinfo, ifp); 770 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 771 IN6_MULTI_UNLOCK(); 772 } 773 /* leave from all multicast groups joined */ 774 in6_purgemaddrs(ifp); 775 776 /* 777 * Remove neighbor management table. 778 * Enabling the nd6_purge will panic on vmove for interfaces on VNET 779 * teardown as the IPv6 layer is cleaned up already and the locks 780 * are destroyed. 781 */ 782 if (purgeulp) 783 nd6_purge(ifp); 784 } 785 786 void 787 in6_ifdetach(struct ifnet *ifp) 788 { 789 790 _in6_ifdetach(ifp, 1); 791 } 792 793 void 794 in6_ifdetach_destroy(struct ifnet *ifp) 795 { 796 797 _in6_ifdetach(ifp, 0); 798 } 799 800 int 801 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 802 const u_int8_t *baseid, int generate) 803 { 804 u_int8_t nullbuf[8]; 805 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 806 807 bzero(nullbuf, sizeof(nullbuf)); 808 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 809 /* we've never created a random ID. Create a new one. */ 810 generate = 1; 811 } 812 813 if (generate) { 814 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 815 816 /* generate_tmp_ifid will update seedn and buf */ 817 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 818 ndi->randomid); 819 } 820 bcopy(ndi->randomid, retbuf, 8); 821 822 return (0); 823 } 824 825 void 826 in6_tmpaddrtimer(void *arg) 827 { 828 CURVNET_SET((struct vnet *) arg); 829 struct epoch_tracker et; 830 struct nd_ifinfo *ndi; 831 u_int8_t nullbuf[8]; 832 struct ifnet *ifp; 833 834 callout_reset(&V_in6_tmpaddrtimer_ch, 835 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 836 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 837 838 bzero(nullbuf, sizeof(nullbuf)); 839 NET_EPOCH_ENTER(et); 840 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 841 if (ifp->if_afdata[AF_INET6] == NULL) 842 continue; 843 ndi = ND_IFINFO(ifp); 844 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 845 /* 846 * We've been generating a random ID on this interface. 847 * Create a new one. 848 */ 849 (void)generate_tmp_ifid(ndi->randomseed0, 850 ndi->randomseed1, ndi->randomid); 851 } 852 } 853 NET_EPOCH_EXIT(et); 854 CURVNET_RESTORE(); 855 } 856 857 static void 858 in6_purgemaddrs(struct ifnet *ifp) 859 { 860 struct in6_multi_head inmh; 861 862 SLIST_INIT(&inmh); 863 IN6_MULTI_LOCK(); 864 IN6_MULTI_LIST_LOCK(); 865 mld_ifdetach(ifp, &inmh); 866 IN6_MULTI_LIST_UNLOCK(); 867 IN6_MULTI_UNLOCK(); 868 in6m_release_list_deferred(&inmh); 869 870 /* 871 * Make sure all multicast deletions invoking if_ioctl() are 872 * completed before returning. Else we risk accessing a freed 873 * ifnet structure pointer. 874 */ 875 in6m_release_wait(NULL); 876 } 877 878 void 879 in6_ifattach_destroy(void) 880 { 881 882 callout_drain(&V_in6_tmpaddrtimer_ch); 883 } 884 885 static void 886 in6_ifattach_init(void *dummy) 887 { 888 889 /* Timer for regeneranation of temporary addresses randomize ID. */ 890 callout_init(&V_in6_tmpaddrtimer_ch, 1); 891 callout_reset(&V_in6_tmpaddrtimer_ch, 892 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 893 V_ip6_temp_regen_advance) * hz, 894 in6_tmpaddrtimer, curvnet); 895 } 896 897 /* 898 * Cheat. 899 * This must be after route_init(), which is now SI_ORDER_THIRD. 900 */ 901 SYSINIT(in6_ifattach_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 902 in6_ifattach_init, NULL); 903