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 TAILQ_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_FDDI: 278 case IFT_ISO88025: 279 case IFT_ATM: 280 case IFT_IEEE1394: 281 /* IEEE802/EUI64 cases - what others? */ 282 /* IEEE1394 uses 16byte length address starting with EUI64 */ 283 if (addrlen > 8) 284 addrlen = 8; 285 286 /* look at IEEE802/EUI64 only */ 287 if (addrlen != 8 && addrlen != 6) { 288 IF_ADDR_RUNLOCK(ifp); 289 return -1; 290 } 291 292 /* 293 * check for invalid MAC address - on bsdi, we see it a lot 294 * since wildboar configures all-zero MAC on pccard before 295 * card insertion. 296 */ 297 if (bcmp(addr, allzero, addrlen) == 0) { 298 IF_ADDR_RUNLOCK(ifp); 299 return -1; 300 } 301 if (bcmp(addr, allone, addrlen) == 0) { 302 IF_ADDR_RUNLOCK(ifp); 303 return -1; 304 } 305 306 /* make EUI64 address */ 307 if (addrlen == 8) 308 bcopy(addr, &in6->s6_addr[8], 8); 309 else if (addrlen == 6) { 310 in6->s6_addr[8] = addr[0]; 311 in6->s6_addr[9] = addr[1]; 312 in6->s6_addr[10] = addr[2]; 313 in6->s6_addr[11] = 0xff; 314 in6->s6_addr[12] = 0xfe; 315 in6->s6_addr[13] = addr[3]; 316 in6->s6_addr[14] = addr[4]; 317 in6->s6_addr[15] = addr[5]; 318 } 319 break; 320 321 case IFT_ARCNET: 322 if (addrlen != 1) { 323 IF_ADDR_RUNLOCK(ifp); 324 return -1; 325 } 326 if (!addr[0]) { 327 IF_ADDR_RUNLOCK(ifp); 328 return -1; 329 } 330 331 bzero(&in6->s6_addr[8], 8); 332 in6->s6_addr[15] = addr[0]; 333 334 /* 335 * due to insufficient bitwidth, we mark it local. 336 */ 337 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 338 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 339 break; 340 341 case IFT_GIF: 342 case IFT_STF: 343 /* 344 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 345 * however, IPv4 address is not very suitable as unique 346 * identifier source (can be renumbered). 347 * we don't do this. 348 */ 349 IF_ADDR_RUNLOCK(ifp); 350 return -1; 351 352 default: 353 IF_ADDR_RUNLOCK(ifp); 354 return -1; 355 } 356 357 /* sanity check: g bit must not indicate "group" */ 358 if (EUI64_GROUP(in6)) { 359 IF_ADDR_RUNLOCK(ifp); 360 return -1; 361 } 362 363 /* convert EUI64 into IPv6 interface identifier */ 364 EUI64_TO_IFID(in6); 365 366 /* 367 * sanity check: ifid must not be all zero, avoid conflict with 368 * subnet router anycast 369 */ 370 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 371 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 372 IF_ADDR_RUNLOCK(ifp); 373 return -1; 374 } 375 376 IF_ADDR_RUNLOCK(ifp); 377 return 0; 378 } 379 380 /* 381 * Get interface identifier for the specified interface. If it is not 382 * available on ifp0, borrow interface identifier from other information 383 * sources. 384 * 385 * altifp - secondary EUI64 source 386 */ 387 static int 388 get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 389 struct in6_addr *in6) 390 { 391 struct ifnet *ifp; 392 393 /* first, try to get it from the interface itself */ 394 if (in6_get_hw_ifid(ifp0, in6) == 0) { 395 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 396 if_name(ifp0))); 397 goto success; 398 } 399 400 /* try secondary EUI64 source. this basically is for ATM PVC */ 401 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 402 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 403 if_name(ifp0), if_name(altifp))); 404 goto success; 405 } 406 407 /* next, try to get it from some other hardware interface */ 408 IFNET_RLOCK_NOSLEEP(); 409 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 410 if (ifp == ifp0) 411 continue; 412 if (in6_get_hw_ifid(ifp, in6) != 0) 413 continue; 414 415 /* 416 * to borrow ifid from other interface, ifid needs to be 417 * globally unique 418 */ 419 if (IFID_UNIVERSAL(in6)) { 420 nd6log((LOG_DEBUG, 421 "%s: borrow interface identifier from %s\n", 422 if_name(ifp0), if_name(ifp))); 423 IFNET_RUNLOCK_NOSLEEP(); 424 goto success; 425 } 426 } 427 IFNET_RUNLOCK_NOSLEEP(); 428 429 /* last resort: get from random number source */ 430 if (get_rand_ifid(ifp, in6) == 0) { 431 nd6log((LOG_DEBUG, 432 "%s: interface identifier generated by random number\n", 433 if_name(ifp0))); 434 goto success; 435 } 436 437 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 438 return -1; 439 440 success: 441 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 442 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 443 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 444 in6->s6_addr[14], in6->s6_addr[15])); 445 return 0; 446 } 447 448 /* 449 * altifp - secondary EUI64 source 450 */ 451 static int 452 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 453 { 454 struct in6_ifaddr *ia; 455 struct in6_aliasreq ifra; 456 struct nd_prefixctl pr0; 457 struct nd_prefix *pr; 458 int error; 459 460 /* 461 * configure link-local address. 462 */ 463 in6_prepare_ifra(&ifra, NULL, &in6mask64); 464 465 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 466 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 467 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 468 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 469 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 470 } else { 471 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 472 nd6log((LOG_ERR, 473 "%s: no ifid available\n", if_name(ifp))); 474 return (-1); 475 } 476 } 477 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 478 return (-1); 479 480 /* link-local addresses should NEVER expire. */ 481 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 482 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 483 484 /* 485 * Now call in6_update_ifa() to do a bunch of procedures to configure 486 * a link-local address. We can set the 3rd argument to NULL, because 487 * we know there's no other link-local address on the interface 488 * and therefore we are adding one (instead of updating one). 489 */ 490 if ((error = in6_update_ifa(ifp, &ifra, NULL, 491 IN6_IFAUPDATE_DADDELAY)) != 0) { 492 /* 493 * XXX: When the interface does not support IPv6, this call 494 * would fail in the SIOCSIFADDR ioctl. I believe the 495 * notification is rather confusing in this case, so just 496 * suppress it. (jinmei@kame.net 20010130) 497 */ 498 if (error != EAFNOSUPPORT) 499 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 500 "configure a link-local address on %s " 501 "(errno=%d)\n", 502 if_name(ifp), error)); 503 return (-1); 504 } 505 506 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 507 KASSERT(ia != NULL, ("%s: ia == NULL, ifp=%p", __func__, ifp)); 508 509 ifa_free(&ia->ia_ifa); 510 511 /* 512 * Make the link-local prefix (fe80::%link/64) as on-link. 513 * Since we'd like to manage prefixes separately from addresses, 514 * we make an ND6 prefix structure for the link-local prefix, 515 * and add it to the prefix list as a never-expire prefix. 516 * XXX: this change might affect some existing code base... 517 */ 518 bzero(&pr0, sizeof(pr0)); 519 pr0.ndpr_ifp = ifp; 520 /* this should be 64 at this moment. */ 521 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 522 pr0.ndpr_prefix = ifra.ifra_addr; 523 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 524 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, &in6mask64); 525 /* 526 * Initialize parameters. The link-local prefix must always be 527 * on-link, and its lifetimes never expire. 528 */ 529 pr0.ndpr_raf_onlink = 1; 530 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 531 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 532 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 533 /* 534 * Since there is no other link-local addresses, nd6_prefix_lookup() 535 * probably returns NULL. However, we cannot always expect the result. 536 * For example, if we first remove the (only) existing link-local 537 * address, and then reconfigure another one, the prefix is still 538 * valid with referring to the old link-local address. 539 */ 540 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 541 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 542 return (error); 543 } else 544 nd6_prefix_rele(pr); 545 546 return 0; 547 } 548 549 /* 550 * ifp - must be IFT_LOOP 551 */ 552 static int 553 in6_ifattach_loopback(struct ifnet *ifp) 554 { 555 struct in6_aliasreq ifra; 556 int error; 557 558 in6_prepare_ifra(&ifra, &in6addr_loopback, &in6mask128); 559 560 /* 561 * Always initialize ia_dstaddr (= broadcast address) to loopback 562 * address. Follows IPv4 practice - see in_ifinit(). 563 */ 564 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 565 ifra.ifra_dstaddr.sin6_family = AF_INET6; 566 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 567 568 /* the loopback address should NEVER expire. */ 569 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 570 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 571 572 /* 573 * We are sure that this is a newly assigned address, so we can set 574 * NULL to the 3rd arg. 575 */ 576 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 577 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 578 "the loopback address on %s (errno=%d)\n", 579 if_name(ifp), error)); 580 return (-1); 581 } 582 583 return 0; 584 } 585 586 /* 587 * compute NI group address, based on the current hostname setting. 588 * see RFC 4620. 589 * 590 * when ifp == NULL, the caller is responsible for filling scopeid. 591 * 592 * If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address 593 * while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620. 594 */ 595 static int 596 in6_nigroup0(struct ifnet *ifp, const char *name, int namelen, 597 struct in6_addr *in6, int oldmcprefix) 598 { 599 struct prison *pr; 600 const char *p; 601 u_char *q; 602 MD5_CTX ctxt; 603 u_int8_t digest[16]; 604 char l; 605 char n[64]; /* a single label must not exceed 63 chars */ 606 607 /* 608 * If no name is given and namelen is -1, 609 * we try to do the hostname lookup ourselves. 610 */ 611 if (!name && namelen == -1) { 612 pr = curthread->td_ucred->cr_prison; 613 mtx_lock(&pr->pr_mtx); 614 name = pr->pr_hostname; 615 namelen = strlen(name); 616 } else 617 pr = NULL; 618 if (!name || !namelen) { 619 if (pr != NULL) 620 mtx_unlock(&pr->pr_mtx); 621 return -1; 622 } 623 624 p = name; 625 while (p && *p && *p != '.' && p - name < namelen) 626 p++; 627 if (p == name || p - name > sizeof(n) - 1) { 628 if (pr != NULL) 629 mtx_unlock(&pr->pr_mtx); 630 return -1; /* label too long */ 631 } 632 l = p - name; 633 strncpy(n, name, l); 634 if (pr != NULL) 635 mtx_unlock(&pr->pr_mtx); 636 n[(int)l] = '\0'; 637 for (q = n; *q; q++) { 638 if ('A' <= *q && *q <= 'Z') 639 *q = *q - 'A' + 'a'; 640 } 641 642 /* generate 16 bytes of pseudo-random value. */ 643 bzero(&ctxt, sizeof(ctxt)); 644 MD5Init(&ctxt); 645 MD5Update(&ctxt, &l, sizeof(l)); 646 MD5Update(&ctxt, n, l); 647 MD5Final(digest, &ctxt); 648 649 bzero(in6, sizeof(*in6)); 650 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 651 in6->s6_addr8[11] = 2; 652 if (oldmcprefix == 0) { 653 in6->s6_addr8[12] = 0xff; 654 /* Copy the first 24 bits of 128-bit hash into the address. */ 655 bcopy(digest, &in6->s6_addr8[13], 3); 656 } else { 657 /* Copy the first 32 bits of 128-bit hash into the address. */ 658 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 659 } 660 if (in6_setscope(in6, ifp, NULL)) 661 return (-1); /* XXX: should not fail */ 662 663 return 0; 664 } 665 666 int 667 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 668 struct in6_addr *in6) 669 { 670 671 return (in6_nigroup0(ifp, name, namelen, in6, 0)); 672 } 673 674 int 675 in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen, 676 struct in6_addr *in6) 677 { 678 679 return (in6_nigroup0(ifp, name, namelen, in6, 1)); 680 } 681 682 /* 683 * XXX multiple loopback interface needs more care. for instance, 684 * nodelocal address needs to be configured onto only one of them. 685 * XXX multiple link-local address case 686 * 687 * altifp - secondary EUI64 source 688 */ 689 void 690 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 691 { 692 struct in6_ifaddr *ia; 693 struct in6_addr in6; 694 695 if (ifp->if_afdata[AF_INET6] == NULL) 696 return; 697 /* 698 * quirks based on interface type 699 */ 700 switch (ifp->if_type) { 701 case IFT_STF: 702 /* 703 * 6to4 interface is a very special kind of beast. 704 * no multicast, no linklocal. RFC2529 specifies how to make 705 * linklocals for 6to4 interface, but there's no use and 706 * it is rather harmful to have one. 707 */ 708 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 709 break; 710 default: 711 break; 712 } 713 714 /* 715 * usually, we require multicast capability to the interface 716 */ 717 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 718 nd6log((LOG_INFO, "in6_ifattach: " 719 "%s is not multicast capable, IPv6 not enabled\n", 720 if_name(ifp))); 721 return; 722 } 723 724 /* 725 * assign loopback address for loopback interface. 726 * XXX multiple loopback interface case. 727 */ 728 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 729 struct ifaddr *ifa; 730 731 in6 = in6addr_loopback; 732 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6); 733 if (ifa == NULL) { 734 if (in6_ifattach_loopback(ifp) != 0) 735 return; 736 } else 737 ifa_free(ifa); 738 } 739 740 /* 741 * assign a link-local address, if there's none. 742 */ 743 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 744 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 745 int error; 746 747 ia = in6ifa_ifpforlinklocal(ifp, 0); 748 if (ia == NULL) { 749 error = in6_ifattach_linklocal(ifp, altifp); 750 #if 0 751 if (error) 752 log(LOG_NOTICE, "in6_ifattach_linklocal: " 753 "failed to add a link-local addr to %s\n", 754 if_name(ifp)); 755 #endif 756 } else 757 ifa_free(&ia->ia_ifa); 758 } 759 760 /* update dynamically. */ 761 if (V_in6_maxmtu < ifp->if_mtu) 762 V_in6_maxmtu = ifp->if_mtu; 763 } 764 765 /* 766 * NOTE: in6_ifdetach() does not support loopback if at this moment. 767 * 768 * When shutting down a VNET we clean up layers top-down. In that case 769 * upper layer protocols (ulp) are cleaned up already and locks are destroyed 770 * and we must not call into these cleanup functions anymore, thus purgeulp 771 * is set to 0 in that case by in6_ifdetach_destroy(). 772 * The normal case of destroying a (cloned) interface still needs to cleanup 773 * everything related to the interface and will have purgeulp set to 1. 774 */ 775 static void 776 _in6_ifdetach(struct ifnet *ifp, int purgeulp) 777 { 778 struct ifaddr *ifa, *next; 779 780 if (ifp->if_afdata[AF_INET6] == NULL) 781 return; 782 783 /* 784 * nuke any of IPv6 addresses we have 785 * XXX: all addresses should be already removed 786 */ 787 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 788 if (ifa->ifa_addr->sa_family != AF_INET6) 789 continue; 790 in6_purgeaddr(ifa); 791 } 792 if (purgeulp) { 793 in6_pcbpurgeif0(&V_udbinfo, ifp); 794 in6_pcbpurgeif0(&V_ulitecbinfo, ifp); 795 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 796 } 797 /* leave from all multicast groups joined */ 798 in6_purgemaddrs(ifp); 799 800 /* 801 * Remove neighbor management table. 802 * Enabling the nd6_purge will panic on vmove for interfaces on VNET 803 * teardown as the IPv6 layer is cleaned up already and the locks 804 * are destroyed. 805 */ 806 if (purgeulp) 807 nd6_purge(ifp); 808 } 809 810 void 811 in6_ifdetach(struct ifnet *ifp) 812 { 813 814 _in6_ifdetach(ifp, 1); 815 } 816 817 void 818 in6_ifdetach_destroy(struct ifnet *ifp) 819 { 820 821 _in6_ifdetach(ifp, 0); 822 } 823 824 int 825 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 826 const u_int8_t *baseid, int generate) 827 { 828 u_int8_t nullbuf[8]; 829 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 830 831 bzero(nullbuf, sizeof(nullbuf)); 832 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 833 /* we've never created a random ID. Create a new one. */ 834 generate = 1; 835 } 836 837 if (generate) { 838 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 839 840 /* generate_tmp_ifid will update seedn and buf */ 841 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 842 ndi->randomid); 843 } 844 bcopy(ndi->randomid, retbuf, 8); 845 846 return (0); 847 } 848 849 void 850 in6_tmpaddrtimer(void *arg) 851 { 852 CURVNET_SET((struct vnet *) arg); 853 struct nd_ifinfo *ndi; 854 u_int8_t nullbuf[8]; 855 struct ifnet *ifp; 856 857 callout_reset(&V_in6_tmpaddrtimer_ch, 858 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 859 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 860 861 bzero(nullbuf, sizeof(nullbuf)); 862 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 863 if (ifp->if_afdata[AF_INET6] == NULL) 864 continue; 865 ndi = ND_IFINFO(ifp); 866 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 867 /* 868 * We've been generating a random ID on this interface. 869 * Create a new one. 870 */ 871 (void)generate_tmp_ifid(ndi->randomseed0, 872 ndi->randomseed1, ndi->randomid); 873 } 874 } 875 876 CURVNET_RESTORE(); 877 } 878 879 static void 880 in6_purgemaddrs(struct ifnet *ifp) 881 { 882 LIST_HEAD(,in6_multi) purgeinms; 883 struct in6_multi *inm, *tinm; 884 struct ifmultiaddr *ifma; 885 886 LIST_INIT(&purgeinms); 887 IN6_MULTI_LOCK(); 888 889 /* 890 * Extract list of in6_multi associated with the detaching ifp 891 * which the PF_INET6 layer is about to release. 892 * We need to do this as IF_ADDR_LOCK() may be re-acquired 893 * by code further down. 894 */ 895 IF_ADDR_RLOCK(ifp); 896 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 897 if (ifma->ifma_addr->sa_family != AF_INET6 || 898 ifma->ifma_protospec == NULL) 899 continue; 900 inm = (struct in6_multi *)ifma->ifma_protospec; 901 LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry); 902 } 903 IF_ADDR_RUNLOCK(ifp); 904 905 LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) { 906 LIST_REMOVE(inm, in6m_entry); 907 in6m_release_locked(inm); 908 } 909 mld_ifdetach(ifp); 910 911 IN6_MULTI_UNLOCK(); 912 } 913 914 void 915 in6_ifattach_destroy(void) 916 { 917 918 callout_drain(&V_in6_tmpaddrtimer_ch); 919 } 920 921 static void 922 in6_ifattach_init(void *dummy) 923 { 924 925 /* Timer for regeneranation of temporary addresses randomize ID. */ 926 callout_init(&V_in6_tmpaddrtimer_ch, 0); 927 callout_reset(&V_in6_tmpaddrtimer_ch, 928 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 929 V_ip6_temp_regen_advance) * hz, 930 in6_tmpaddrtimer, curvnet); 931 } 932 933 /* 934 * Cheat. 935 * This must be after route_init(), which is now SI_ORDER_THIRD. 936 */ 937 SYSINIT(in6_ifattach_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 938 in6_ifattach_init, NULL); 939