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/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/malloc.h> 40 #include <sys/socket.h> 41 #include <sys/sockio.h> 42 #include <sys/jail.h> 43 #include <sys/kernel.h> 44 #include <sys/lock.h> 45 #include <sys/proc.h> 46 #include <sys/rmlock.h> 47 #include <sys/syslog.h> 48 #include <sys/md5.h> 49 50 #include <net/if.h> 51 #include <net/if_var.h> 52 #include <net/if_dl.h> 53 #include <net/if_types.h> 54 #include <net/route.h> 55 #include <net/vnet.h> 56 57 #include <netinet/in.h> 58 #include <netinet/in_var.h> 59 #include <netinet/if_ether.h> 60 #include <netinet/in_pcb.h> 61 #include <netinet/ip_var.h> 62 #include <netinet/udp.h> 63 #include <netinet/udp_var.h> 64 65 #include <netinet/ip6.h> 66 #include <netinet6/ip6_var.h> 67 #include <netinet6/in6_var.h> 68 #include <netinet6/in6_pcb.h> 69 #include <netinet6/in6_ifattach.h> 70 #include <netinet6/ip6_var.h> 71 #include <netinet6/nd6.h> 72 #include <netinet6/mld6_var.h> 73 #include <netinet6/scope6_var.h> 74 75 VNET_DEFINE(unsigned long, in6_maxmtu) = 0; 76 77 #ifdef IP6_AUTO_LINKLOCAL 78 VNET_DEFINE(int, ip6_auto_linklocal) = IP6_AUTO_LINKLOCAL; 79 #else 80 VNET_DEFINE(int, ip6_auto_linklocal) = 1; /* enabled by default */ 81 #endif 82 83 VNET_DEFINE(struct callout, in6_tmpaddrtimer_ch); 84 #define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch) 85 86 VNET_DECLARE(struct inpcbinfo, ripcbinfo); 87 #define V_ripcbinfo VNET(ripcbinfo) 88 89 static int get_rand_ifid(struct ifnet *, struct in6_addr *); 90 static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 91 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 92 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 93 static int in6_ifattach_loopback(struct ifnet *); 94 static void in6_purgemaddrs(struct ifnet *); 95 96 #define EUI64_GBIT 0x01 97 #define EUI64_UBIT 0x02 98 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 99 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 100 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 101 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 102 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 103 104 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 105 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 106 107 /* 108 * Generate a last-resort interface identifier, when the machine has no 109 * IEEE802/EUI64 address sources. 110 * The goal here is to get an interface identifier that is 111 * (1) random enough and (2) does not change across reboot. 112 * We currently use MD5(hostname) for it. 113 * 114 * in6 - upper 64bits are preserved 115 */ 116 static int 117 get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 118 { 119 MD5_CTX ctxt; 120 struct prison *pr; 121 u_int8_t digest[16]; 122 int hostnamelen; 123 124 pr = curthread->td_ucred->cr_prison; 125 mtx_lock(&pr->pr_mtx); 126 hostnamelen = strlen(pr->pr_hostname); 127 #if 0 128 /* we need at least several letters as seed for ifid */ 129 if (hostnamelen < 3) { 130 mtx_unlock(&pr->pr_mtx); 131 return -1; 132 } 133 #endif 134 135 /* generate 8 bytes of pseudo-random value. */ 136 bzero(&ctxt, sizeof(ctxt)); 137 MD5Init(&ctxt); 138 MD5Update(&ctxt, pr->pr_hostname, hostnamelen); 139 mtx_unlock(&pr->pr_mtx); 140 MD5Final(digest, &ctxt); 141 142 /* assumes sizeof(digest) > sizeof(ifid) */ 143 bcopy(digest, &in6->s6_addr[8], 8); 144 145 /* make sure to set "u" bit to local, and "g" bit to individual. */ 146 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 147 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 148 149 /* convert EUI64 into IPv6 interface identifier */ 150 EUI64_TO_IFID(in6); 151 152 return 0; 153 } 154 155 static int 156 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 157 { 158 MD5_CTX ctxt; 159 u_int8_t seed[16], digest[16], nullbuf[8]; 160 u_int32_t val32; 161 162 /* If there's no history, start with a random seed. */ 163 bzero(nullbuf, sizeof(nullbuf)); 164 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 165 int i; 166 167 for (i = 0; i < 2; i++) { 168 val32 = arc4random(); 169 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 170 } 171 } else 172 bcopy(seed0, seed, 8); 173 174 /* copy the right-most 64-bits of the given address */ 175 /* XXX assumption on the size of IFID */ 176 bcopy(seed1, &seed[8], 8); 177 178 if (0) { /* for debugging purposes only */ 179 int i; 180 181 printf("generate_tmp_ifid: new randomized ID from: "); 182 for (i = 0; i < 16; i++) 183 printf("%02x", seed[i]); 184 printf(" "); 185 } 186 187 /* generate 16 bytes of pseudo-random value. */ 188 bzero(&ctxt, sizeof(ctxt)); 189 MD5Init(&ctxt); 190 MD5Update(&ctxt, seed, sizeof(seed)); 191 MD5Final(digest, &ctxt); 192 193 /* 194 * RFC 3041 3.2.1. (3) 195 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 196 * left-most bit is numbered 0) to zero. 197 */ 198 bcopy(digest, ret, 8); 199 ret[0] &= ~EUI64_UBIT; 200 201 /* 202 * XXX: we'd like to ensure that the generated value is not zero 203 * for simplicity. If the caclculated digest happens to be zero, 204 * use a random non-zero value as the last resort. 205 */ 206 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 207 nd6log((LOG_INFO, 208 "generate_tmp_ifid: computed MD5 value is zero.\n")); 209 210 val32 = arc4random(); 211 val32 = 1 + (val32 % (0xffffffff - 1)); 212 } 213 214 /* 215 * RFC 3041 3.2.1. (4) 216 * Take the rightmost 64-bits of the MD5 digest and save them in 217 * stable storage as the history value to be used in the next 218 * iteration of the algorithm. 219 */ 220 bcopy(&digest[8], seed0, 8); 221 222 if (0) { /* for debugging purposes only */ 223 int i; 224 225 printf("to: "); 226 for (i = 0; i < 16; i++) 227 printf("%02x", digest[i]); 228 printf("\n"); 229 } 230 231 return 0; 232 } 233 234 /* 235 * Get interface identifier for the specified interface. 236 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 237 * 238 * in6 - upper 64bits are preserved 239 */ 240 int 241 in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 242 { 243 struct ifaddr *ifa; 244 struct sockaddr_dl *sdl; 245 u_int8_t *addr; 246 size_t addrlen; 247 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 248 static u_int8_t allone[8] = 249 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 250 251 IF_ADDR_RLOCK(ifp); 252 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 253 if (ifa->ifa_addr->sa_family != AF_LINK) 254 continue; 255 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 256 if (sdl == NULL) 257 continue; 258 if (sdl->sdl_alen == 0) 259 continue; 260 261 goto found; 262 } 263 IF_ADDR_RUNLOCK(ifp); 264 265 return -1; 266 267 found: 268 IF_ADDR_LOCK_ASSERT(ifp); 269 addr = LLADDR(sdl); 270 addrlen = sdl->sdl_alen; 271 272 /* get EUI64 */ 273 switch (ifp->if_type) { 274 case IFT_BRIDGE: 275 case IFT_ETHER: 276 case IFT_L2VLAN: 277 case IFT_ATM: 278 case IFT_IEEE1394: 279 /* IEEE802/EUI64 cases - what others? */ 280 /* IEEE1394 uses 16byte length address starting with EUI64 */ 281 if (addrlen > 8) 282 addrlen = 8; 283 284 /* look at IEEE802/EUI64 only */ 285 if (addrlen != 8 && addrlen != 6) { 286 IF_ADDR_RUNLOCK(ifp); 287 return -1; 288 } 289 290 /* 291 * check for invalid MAC address - on bsdi, we see it a lot 292 * since wildboar configures all-zero MAC on pccard before 293 * card insertion. 294 */ 295 if (bcmp(addr, allzero, addrlen) == 0) { 296 IF_ADDR_RUNLOCK(ifp); 297 return -1; 298 } 299 if (bcmp(addr, allone, addrlen) == 0) { 300 IF_ADDR_RUNLOCK(ifp); 301 return -1; 302 } 303 304 /* make EUI64 address */ 305 if (addrlen == 8) 306 bcopy(addr, &in6->s6_addr[8], 8); 307 else if (addrlen == 6) { 308 in6->s6_addr[8] = addr[0]; 309 in6->s6_addr[9] = addr[1]; 310 in6->s6_addr[10] = addr[2]; 311 in6->s6_addr[11] = 0xff; 312 in6->s6_addr[12] = 0xfe; 313 in6->s6_addr[13] = addr[3]; 314 in6->s6_addr[14] = addr[4]; 315 in6->s6_addr[15] = addr[5]; 316 } 317 break; 318 319 case IFT_GIF: 320 case IFT_STF: 321 /* 322 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 323 * however, IPv4 address is not very suitable as unique 324 * identifier source (can be renumbered). 325 * we don't do this. 326 */ 327 IF_ADDR_RUNLOCK(ifp); 328 return -1; 329 330 default: 331 IF_ADDR_RUNLOCK(ifp); 332 return -1; 333 } 334 335 /* sanity check: g bit must not indicate "group" */ 336 if (EUI64_GROUP(in6)) { 337 IF_ADDR_RUNLOCK(ifp); 338 return -1; 339 } 340 341 /* convert EUI64 into IPv6 interface identifier */ 342 EUI64_TO_IFID(in6); 343 344 /* 345 * sanity check: ifid must not be all zero, avoid conflict with 346 * subnet router anycast 347 */ 348 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 349 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 350 IF_ADDR_RUNLOCK(ifp); 351 return -1; 352 } 353 354 IF_ADDR_RUNLOCK(ifp); 355 return 0; 356 } 357 358 /* 359 * Get interface identifier for the specified interface. If it is not 360 * available on ifp0, borrow interface identifier from other information 361 * sources. 362 * 363 * altifp - secondary EUI64 source 364 */ 365 static int 366 get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 367 struct in6_addr *in6) 368 { 369 struct ifnet *ifp; 370 371 /* first, try to get it from the interface itself */ 372 if (in6_get_hw_ifid(ifp0, in6) == 0) { 373 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 374 if_name(ifp0))); 375 goto success; 376 } 377 378 /* try secondary EUI64 source. this basically is for ATM PVC */ 379 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 380 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 381 if_name(ifp0), if_name(altifp))); 382 goto success; 383 } 384 385 /* next, try to get it from some other hardware interface */ 386 IFNET_RLOCK_NOSLEEP(); 387 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 388 if (ifp == ifp0) 389 continue; 390 if (in6_get_hw_ifid(ifp, in6) != 0) 391 continue; 392 393 /* 394 * to borrow ifid from other interface, ifid needs to be 395 * globally unique 396 */ 397 if (IFID_UNIVERSAL(in6)) { 398 nd6log((LOG_DEBUG, 399 "%s: borrow interface identifier from %s\n", 400 if_name(ifp0), if_name(ifp))); 401 IFNET_RUNLOCK_NOSLEEP(); 402 goto success; 403 } 404 } 405 IFNET_RUNLOCK_NOSLEEP(); 406 407 /* last resort: get from random number source */ 408 if (get_rand_ifid(ifp, in6) == 0) { 409 nd6log((LOG_DEBUG, 410 "%s: interface identifier generated by random number\n", 411 if_name(ifp0))); 412 goto success; 413 } 414 415 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 416 return -1; 417 418 success: 419 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 420 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 421 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 422 in6->s6_addr[14], in6->s6_addr[15])); 423 return 0; 424 } 425 426 /* 427 * altifp - secondary EUI64 source 428 */ 429 static int 430 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 431 { 432 struct in6_ifaddr *ia; 433 struct in6_aliasreq ifra; 434 struct nd_prefixctl pr0; 435 struct nd_prefix *pr; 436 int error; 437 438 /* 439 * configure link-local address. 440 */ 441 in6_prepare_ifra(&ifra, NULL, &in6mask64); 442 443 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 444 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 445 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 446 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 447 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 448 } else { 449 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 450 nd6log((LOG_ERR, 451 "%s: no ifid available\n", if_name(ifp))); 452 return (-1); 453 } 454 } 455 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 456 return (-1); 457 458 /* link-local addresses should NEVER expire. */ 459 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 460 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 461 462 /* 463 * Now call in6_update_ifa() to do a bunch of procedures to configure 464 * a link-local address. We can set the 3rd argument to NULL, because 465 * we know there's no other link-local address on the interface 466 * and therefore we are adding one (instead of updating one). 467 */ 468 if ((error = in6_update_ifa(ifp, &ifra, NULL, 469 IN6_IFAUPDATE_DADDELAY)) != 0) { 470 /* 471 * XXX: When the interface does not support IPv6, this call 472 * would fail in the SIOCSIFADDR ioctl. I believe the 473 * notification is rather confusing in this case, so just 474 * suppress it. (jinmei@kame.net 20010130) 475 */ 476 if (error != EAFNOSUPPORT) 477 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 478 "configure a link-local address on %s " 479 "(errno=%d)\n", 480 if_name(ifp), error)); 481 return (-1); 482 } 483 484 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 485 KASSERT(ia != NULL, ("%s: ia == NULL, ifp=%p", __func__, ifp)); 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, NULL)) != 0) 520 return (error); 521 } else 522 nd6_prefix_rele(pr); 523 524 return 0; 525 } 526 527 /* 528 * ifp - must be IFT_LOOP 529 */ 530 static int 531 in6_ifattach_loopback(struct ifnet *ifp) 532 { 533 struct in6_aliasreq ifra; 534 int error; 535 536 in6_prepare_ifra(&ifra, &in6addr_loopback, &in6mask128); 537 538 /* 539 * Always initialize ia_dstaddr (= broadcast address) to loopback 540 * address. Follows IPv4 practice - see in_ifinit(). 541 */ 542 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 543 ifra.ifra_dstaddr.sin6_family = AF_INET6; 544 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 545 546 /* the loopback address should NEVER expire. */ 547 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 548 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 549 550 /* 551 * We are sure that this is a newly assigned address, so we can set 552 * NULL to the 3rd arg. 553 */ 554 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 555 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 556 "the loopback address on %s (errno=%d)\n", 557 if_name(ifp), error)); 558 return (-1); 559 } 560 561 return 0; 562 } 563 564 /* 565 * compute NI group address, based on the current hostname setting. 566 * see RFC 4620. 567 * 568 * when ifp == NULL, the caller is responsible for filling scopeid. 569 * 570 * If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address 571 * while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620. 572 */ 573 static int 574 in6_nigroup0(struct ifnet *ifp, const char *name, int namelen, 575 struct in6_addr *in6, int oldmcprefix) 576 { 577 struct prison *pr; 578 const char *p; 579 u_char *q; 580 MD5_CTX ctxt; 581 u_int8_t digest[16]; 582 char l; 583 char n[64]; /* a single label must not exceed 63 chars */ 584 585 /* 586 * If no name is given and namelen is -1, 587 * we try to do the hostname lookup ourselves. 588 */ 589 if (!name && namelen == -1) { 590 pr = curthread->td_ucred->cr_prison; 591 mtx_lock(&pr->pr_mtx); 592 name = pr->pr_hostname; 593 namelen = strlen(name); 594 } else 595 pr = NULL; 596 if (!name || !namelen) { 597 if (pr != NULL) 598 mtx_unlock(&pr->pr_mtx); 599 return -1; 600 } 601 602 p = name; 603 while (p && *p && *p != '.' && p - name < namelen) 604 p++; 605 if (p == name || p - name > sizeof(n) - 1) { 606 if (pr != NULL) 607 mtx_unlock(&pr->pr_mtx); 608 return -1; /* label too long */ 609 } 610 l = p - name; 611 strncpy(n, name, l); 612 if (pr != NULL) 613 mtx_unlock(&pr->pr_mtx); 614 n[(int)l] = '\0'; 615 for (q = n; *q; q++) { 616 if ('A' <= *q && *q <= 'Z') 617 *q = *q - 'A' + 'a'; 618 } 619 620 /* generate 16 bytes of pseudo-random value. */ 621 bzero(&ctxt, sizeof(ctxt)); 622 MD5Init(&ctxt); 623 MD5Update(&ctxt, &l, sizeof(l)); 624 MD5Update(&ctxt, n, l); 625 MD5Final(digest, &ctxt); 626 627 bzero(in6, sizeof(*in6)); 628 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 629 in6->s6_addr8[11] = 2; 630 if (oldmcprefix == 0) { 631 in6->s6_addr8[12] = 0xff; 632 /* Copy the first 24 bits of 128-bit hash into the address. */ 633 bcopy(digest, &in6->s6_addr8[13], 3); 634 } else { 635 /* Copy the first 32 bits of 128-bit hash into the address. */ 636 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 637 } 638 if (in6_setscope(in6, ifp, NULL)) 639 return (-1); /* XXX: should not fail */ 640 641 return 0; 642 } 643 644 int 645 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 646 struct in6_addr *in6) 647 { 648 649 return (in6_nigroup0(ifp, name, namelen, in6, 0)); 650 } 651 652 int 653 in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen, 654 struct in6_addr *in6) 655 { 656 657 return (in6_nigroup0(ifp, name, namelen, in6, 1)); 658 } 659 660 /* 661 * XXX multiple loopback interface needs more care. for instance, 662 * nodelocal address needs to be configured onto only one of them. 663 * XXX multiple link-local address case 664 * 665 * altifp - secondary EUI64 source 666 */ 667 void 668 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 669 { 670 struct in6_ifaddr *ia; 671 672 if (ifp->if_afdata[AF_INET6] == NULL) 673 return; 674 /* 675 * quirks based on interface type 676 */ 677 switch (ifp->if_type) { 678 case IFT_STF: 679 /* 680 * 6to4 interface is a very special kind of beast. 681 * no multicast, no linklocal. RFC2529 specifies how to make 682 * linklocals for 6to4 interface, but there's no use and 683 * it is rather harmful to have one. 684 */ 685 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 686 break; 687 default: 688 break; 689 } 690 691 /* 692 * usually, we require multicast capability to the interface 693 */ 694 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 695 nd6log((LOG_INFO, "in6_ifattach: " 696 "%s is not multicast capable, IPv6 not enabled\n", 697 if_name(ifp))); 698 return; 699 } 700 701 /* 702 * assign loopback address for loopback interface. 703 */ 704 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 705 /* 706 * check that loopback address doesn't exist yet. 707 */ 708 ia = in6ifa_ifwithaddr(&in6addr_loopback, 0); 709 if (ia == NULL) 710 in6_ifattach_loopback(ifp); 711 else 712 ifa_free(&ia->ia_ifa); 713 } 714 715 /* 716 * assign a link-local address, if there's none. 717 */ 718 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 719 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 720 ia = in6ifa_ifpforlinklocal(ifp, 0); 721 if (ia == NULL) 722 in6_ifattach_linklocal(ifp, altifp); 723 else 724 ifa_free(&ia->ia_ifa); 725 } 726 727 /* update dynamically. */ 728 if (V_in6_maxmtu < ifp->if_mtu) 729 V_in6_maxmtu = ifp->if_mtu; 730 } 731 732 /* 733 * NOTE: in6_ifdetach() does not support loopback if at this moment. 734 * 735 * When shutting down a VNET we clean up layers top-down. In that case 736 * upper layer protocols (ulp) are cleaned up already and locks are destroyed 737 * and we must not call into these cleanup functions anymore, thus purgeulp 738 * is set to 0 in that case by in6_ifdetach_destroy(). 739 * The normal case of destroying a (cloned) interface still needs to cleanup 740 * everything related to the interface and will have purgeulp set to 1. 741 */ 742 static void 743 _in6_ifdetach(struct ifnet *ifp, int purgeulp) 744 { 745 struct ifaddr *ifa, *next; 746 747 if (ifp->if_afdata[AF_INET6] == NULL) 748 return; 749 750 /* 751 * nuke any of IPv6 addresses we have 752 */ 753 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 754 if (ifa->ifa_addr->sa_family != AF_INET6) 755 continue; 756 in6_purgeaddr(ifa); 757 } 758 if (purgeulp) { 759 in6_pcbpurgeif0(&V_udbinfo, ifp); 760 in6_pcbpurgeif0(&V_ulitecbinfo, ifp); 761 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 762 } 763 /* leave from all multicast groups joined */ 764 in6_purgemaddrs(ifp); 765 766 /* 767 * Remove neighbor management table. 768 * Enabling the nd6_purge will panic on vmove for interfaces on VNET 769 * teardown as the IPv6 layer is cleaned up already and the locks 770 * are destroyed. 771 */ 772 if (purgeulp) 773 nd6_purge(ifp); 774 } 775 776 void 777 in6_ifdetach(struct ifnet *ifp) 778 { 779 780 _in6_ifdetach(ifp, 1); 781 } 782 783 void 784 in6_ifdetach_destroy(struct ifnet *ifp) 785 { 786 787 _in6_ifdetach(ifp, 0); 788 } 789 790 int 791 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 792 const u_int8_t *baseid, int generate) 793 { 794 u_int8_t nullbuf[8]; 795 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 796 797 bzero(nullbuf, sizeof(nullbuf)); 798 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 799 /* we've never created a random ID. Create a new one. */ 800 generate = 1; 801 } 802 803 if (generate) { 804 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 805 806 /* generate_tmp_ifid will update seedn and buf */ 807 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 808 ndi->randomid); 809 } 810 bcopy(ndi->randomid, retbuf, 8); 811 812 return (0); 813 } 814 815 void 816 in6_tmpaddrtimer(void *arg) 817 { 818 CURVNET_SET((struct vnet *) arg); 819 struct nd_ifinfo *ndi; 820 u_int8_t nullbuf[8]; 821 struct ifnet *ifp; 822 823 callout_reset(&V_in6_tmpaddrtimer_ch, 824 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 825 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 826 827 bzero(nullbuf, sizeof(nullbuf)); 828 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 829 if (ifp->if_afdata[AF_INET6] == NULL) 830 continue; 831 ndi = ND_IFINFO(ifp); 832 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 833 /* 834 * We've been generating a random ID on this interface. 835 * Create a new one. 836 */ 837 (void)generate_tmp_ifid(ndi->randomseed0, 838 ndi->randomseed1, ndi->randomid); 839 } 840 } 841 842 CURVNET_RESTORE(); 843 } 844 845 static void 846 in6_purgemaddrs(struct ifnet *ifp) 847 { 848 struct in6_multi_head purgeinms; 849 struct in6_multi *inm; 850 struct ifmultiaddr *ifma, *next; 851 852 SLIST_INIT(&purgeinms); 853 IN6_MULTI_LOCK(); 854 IN6_MULTI_LIST_LOCK(); 855 IF_ADDR_WLOCK(ifp); 856 /* 857 * Extract list of in6_multi associated with the detaching ifp 858 * which the PF_INET6 layer is about to release. 859 */ 860 restart: 861 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) { 862 if (ifma->ifma_addr->sa_family != AF_INET6 || 863 ifma->ifma_protospec == NULL) 864 continue; 865 inm = (struct in6_multi *)ifma->ifma_protospec; 866 in6m_disconnect(inm); 867 in6m_rele_locked(&purgeinms, inm); 868 if (__predict_false(ifma6_restart)) { 869 ifma6_restart = false; 870 goto restart; 871 } 872 } 873 IF_ADDR_WUNLOCK(ifp); 874 mld_ifdetach(ifp); 875 IN6_MULTI_LIST_UNLOCK(); 876 IN6_MULTI_UNLOCK(); 877 in6m_release_list_deferred(&purgeinms); 878 } 879 880 void 881 in6_ifattach_destroy(void) 882 { 883 884 callout_drain(&V_in6_tmpaddrtimer_ch); 885 } 886 887 static void 888 in6_ifattach_init(void *dummy) 889 { 890 891 /* Timer for regeneranation of temporary addresses randomize ID. */ 892 callout_init(&V_in6_tmpaddrtimer_ch, 0); 893 callout_reset(&V_in6_tmpaddrtimer_ch, 894 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 895 V_ip6_temp_regen_advance) * hz, 896 in6_tmpaddrtimer, curvnet); 897 } 898 899 /* 900 * Cheat. 901 * This must be after route_init(), which is now SI_ORDER_THIRD. 902 */ 903 SYSINIT(in6_ifattach_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 904 in6_ifattach_init, NULL); 905