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sys/netinet6/in6_ifattach.c
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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 case IFT_INFINIBAND: 331 if (addrlen != 20) { 332 IF_ADDR_RUNLOCK(ifp); 333 return -1; 334 } 335 bcopy(addr + 12, &in6->s6_addr[8], 8); 336 break; 337 338 default: 339 IF_ADDR_RUNLOCK(ifp); 340 return -1; 341 } 342 343 /* sanity check: g bit must not indicate "group" */ 344 if (EUI64_GROUP(in6)) { 345 IF_ADDR_RUNLOCK(ifp); 346 return -1; 347 } 348 349 /* convert EUI64 into IPv6 interface identifier */ 350 EUI64_TO_IFID(in6); 351 352 /* 353 * sanity check: ifid must not be all zero, avoid conflict with 354 * subnet router anycast 355 */ 356 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 357 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 358 IF_ADDR_RUNLOCK(ifp); 359 return -1; 360 } 361 362 IF_ADDR_RUNLOCK(ifp); 363 return 0; 364 } 365 366 /* 367 * Get interface identifier for the specified interface. If it is not 368 * available on ifp0, borrow interface identifier from other information 369 * sources. 370 * 371 * altifp - secondary EUI64 source 372 */ 373 static int 374 get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 375 struct in6_addr *in6) 376 { 377 struct ifnet *ifp; 378 379 /* first, try to get it from the interface itself */ 380 if (in6_get_hw_ifid(ifp0, in6) == 0) { 381 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 382 if_name(ifp0))); 383 goto success; 384 } 385 386 /* try secondary EUI64 source. this basically is for ATM PVC */ 387 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 388 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 389 if_name(ifp0), if_name(altifp))); 390 goto success; 391 } 392 393 /* next, try to get it from some other hardware interface */ 394 IFNET_RLOCK_NOSLEEP(); 395 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 396 if (ifp == ifp0) 397 continue; 398 if (in6_get_hw_ifid(ifp, in6) != 0) 399 continue; 400 401 /* 402 * to borrow ifid from other interface, ifid needs to be 403 * globally unique 404 */ 405 if (IFID_UNIVERSAL(in6)) { 406 nd6log((LOG_DEBUG, 407 "%s: borrow interface identifier from %s\n", 408 if_name(ifp0), if_name(ifp))); 409 IFNET_RUNLOCK_NOSLEEP(); 410 goto success; 411 } 412 } 413 IFNET_RUNLOCK_NOSLEEP(); 414 415 /* last resort: get from random number source */ 416 if (get_rand_ifid(ifp, in6) == 0) { 417 nd6log((LOG_DEBUG, 418 "%s: interface identifier generated by random number\n", 419 if_name(ifp0))); 420 goto success; 421 } 422 423 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 424 return -1; 425 426 success: 427 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 428 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 429 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 430 in6->s6_addr[14], in6->s6_addr[15])); 431 return 0; 432 } 433 434 /* 435 * altifp - secondary EUI64 source 436 */ 437 static int 438 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 439 { 440 struct in6_ifaddr *ia; 441 struct in6_aliasreq ifra; 442 struct nd_prefixctl pr0; 443 struct nd_prefix *pr; 444 int error; 445 446 /* 447 * configure link-local address. 448 */ 449 in6_prepare_ifra(&ifra, NULL, &in6mask64); 450 451 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 452 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 453 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 454 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 455 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 456 } else { 457 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 458 nd6log((LOG_ERR, 459 "%s: no ifid available\n", if_name(ifp))); 460 return (-1); 461 } 462 } 463 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 464 return (-1); 465 466 /* link-local addresses should NEVER expire. */ 467 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 468 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 469 470 /* 471 * Now call in6_update_ifa() to do a bunch of procedures to configure 472 * a link-local address. We can set the 3rd argument to NULL, because 473 * we know there's no other link-local address on the interface 474 * and therefore we are adding one (instead of updating one). 475 */ 476 if ((error = in6_update_ifa(ifp, &ifra, NULL, 477 IN6_IFAUPDATE_DADDELAY)) != 0) { 478 /* 479 * XXX: When the interface does not support IPv6, this call 480 * would fail in the SIOCSIFADDR ioctl. I believe the 481 * notification is rather confusing in this case, so just 482 * suppress it. (jinmei@kame.net 20010130) 483 */ 484 if (error != EAFNOSUPPORT) 485 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 486 "configure a link-local address on %s " 487 "(errno=%d)\n", 488 if_name(ifp), error)); 489 return (-1); 490 } 491 492 ia = in6ifa_ifpforlinklocal(ifp, 0); 493 if (ia == NULL) { 494 /* 495 * Another thread removed the address that we just added. 496 * This should be rare, but it happens. 497 */ 498 nd6log((LOG_NOTICE, "%s: %s: new link-local address " 499 "disappeared\n", __func__, if_name(ifp))); 500 return (-1); 501 } 502 ifa_free(&ia->ia_ifa); 503 504 /* 505 * Make the link-local prefix (fe80::%link/64) as on-link. 506 * Since we'd like to manage prefixes separately from addresses, 507 * we make an ND6 prefix structure for the link-local prefix, 508 * and add it to the prefix list as a never-expire prefix. 509 * XXX: this change might affect some existing code base... 510 */ 511 bzero(&pr0, sizeof(pr0)); 512 pr0.ndpr_ifp = ifp; 513 /* this should be 64 at this moment. */ 514 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 515 pr0.ndpr_prefix = ifra.ifra_addr; 516 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 517 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, &in6mask64); 518 /* 519 * Initialize parameters. The link-local prefix must always be 520 * on-link, and its lifetimes never expire. 521 */ 522 pr0.ndpr_raf_onlink = 1; 523 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 524 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 525 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 526 /* 527 * Since there is no other link-local addresses, nd6_prefix_lookup() 528 * probably returns NULL. However, we cannot always expect the result. 529 * For example, if we first remove the (only) existing link-local 530 * address, and then reconfigure another one, the prefix is still 531 * valid with referring to the old link-local address. 532 */ 533 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 534 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 535 return (error); 536 } else 537 nd6_prefix_rele(pr); 538 539 return 0; 540 } 541 542 /* 543 * ifp - must be IFT_LOOP 544 */ 545 static int 546 in6_ifattach_loopback(struct ifnet *ifp) 547 { 548 struct in6_aliasreq ifra; 549 int error; 550 551 in6_prepare_ifra(&ifra, &in6addr_loopback, &in6mask128); 552 553 /* 554 * Always initialize ia_dstaddr (= broadcast address) to loopback 555 * address. Follows IPv4 practice - see in_ifinit(). 556 */ 557 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 558 ifra.ifra_dstaddr.sin6_family = AF_INET6; 559 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 560 561 /* the loopback address should NEVER expire. */ 562 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 563 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 564 565 /* 566 * We are sure that this is a newly assigned address, so we can set 567 * NULL to the 3rd arg. 568 */ 569 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 570 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 571 "the loopback address on %s (errno=%d)\n", 572 if_name(ifp), error)); 573 return (-1); 574 } 575 576 return 0; 577 } 578 579 /* 580 * compute NI group address, based on the current hostname setting. 581 * see RFC 4620. 582 * 583 * when ifp == NULL, the caller is responsible for filling scopeid. 584 * 585 * If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address 586 * while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620. 587 */ 588 static int 589 in6_nigroup0(struct ifnet *ifp, const char *name, int namelen, 590 struct in6_addr *in6, int oldmcprefix) 591 { 592 struct prison *pr; 593 const char *p; 594 u_char *q; 595 MD5_CTX ctxt; 596 u_int8_t digest[16]; 597 char l; 598 char n[64]; /* a single label must not exceed 63 chars */ 599 600 /* 601 * If no name is given and namelen is -1, 602 * we try to do the hostname lookup ourselves. 603 */ 604 if (!name && namelen == -1) { 605 pr = curthread->td_ucred->cr_prison; 606 mtx_lock(&pr->pr_mtx); 607 name = pr->pr_hostname; 608 namelen = strlen(name); 609 } else 610 pr = NULL; 611 if (!name || !namelen) { 612 if (pr != NULL) 613 mtx_unlock(&pr->pr_mtx); 614 return -1; 615 } 616 617 p = name; 618 while (p && *p && *p != '.' && p - name < namelen) 619 p++; 620 if (p == name || p - name > sizeof(n) - 1) { 621 if (pr != NULL) 622 mtx_unlock(&pr->pr_mtx); 623 return -1; /* label too long */ 624 } 625 l = p - name; 626 strncpy(n, name, l); 627 if (pr != NULL) 628 mtx_unlock(&pr->pr_mtx); 629 n[(int)l] = '\0'; 630 for (q = n; *q; q++) { 631 if ('A' <= *q && *q <= 'Z') 632 *q = *q - 'A' + 'a'; 633 } 634 635 /* generate 16 bytes of pseudo-random value. */ 636 bzero(&ctxt, sizeof(ctxt)); 637 MD5Init(&ctxt); 638 MD5Update(&ctxt, &l, sizeof(l)); 639 MD5Update(&ctxt, n, l); 640 MD5Final(digest, &ctxt); 641 642 bzero(in6, sizeof(*in6)); 643 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 644 in6->s6_addr8[11] = 2; 645 if (oldmcprefix == 0) { 646 in6->s6_addr8[12] = 0xff; 647 /* Copy the first 24 bits of 128-bit hash into the address. */ 648 bcopy(digest, &in6->s6_addr8[13], 3); 649 } else { 650 /* Copy the first 32 bits of 128-bit hash into the address. */ 651 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 652 } 653 if (in6_setscope(in6, ifp, NULL)) 654 return (-1); /* XXX: should not fail */ 655 656 return 0; 657 } 658 659 int 660 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 661 struct in6_addr *in6) 662 { 663 664 return (in6_nigroup0(ifp, name, namelen, in6, 0)); 665 } 666 667 int 668 in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen, 669 struct in6_addr *in6) 670 { 671 672 return (in6_nigroup0(ifp, name, namelen, in6, 1)); 673 } 674 675 /* 676 * XXX multiple loopback interface needs more care. for instance, 677 * nodelocal address needs to be configured onto only one of them. 678 * XXX multiple link-local address case 679 * 680 * altifp - secondary EUI64 source 681 */ 682 void 683 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 684 { 685 struct in6_ifaddr *ia; 686 687 if (ifp->if_afdata[AF_INET6] == NULL) 688 return; 689 /* 690 * quirks based on interface type 691 */ 692 switch (ifp->if_type) { 693 case IFT_STF: 694 /* 695 * 6to4 interface is a very special kind of beast. 696 * no multicast, no linklocal. RFC2529 specifies how to make 697 * linklocals for 6to4 interface, but there's no use and 698 * it is rather harmful to have one. 699 */ 700 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 701 ND_IFINFO(ifp)->flags |= ND6_IFF_NO_DAD; 702 break; 703 default: 704 break; 705 } 706 707 /* 708 * usually, we require multicast capability to the interface 709 */ 710 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 711 nd6log((LOG_INFO, "in6_ifattach: " 712 "%s is not multicast capable, IPv6 not enabled\n", 713 if_name(ifp))); 714 return; 715 } 716 717 /* 718 * assign loopback address for loopback interface. 719 */ 720 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 721 /* 722 * check that loopback address doesn't exist yet. 723 */ 724 ia = in6ifa_ifwithaddr(&in6addr_loopback, 0); 725 if (ia == NULL) 726 in6_ifattach_loopback(ifp); 727 else 728 ifa_free(&ia->ia_ifa); 729 } 730 731 /* 732 * assign a link-local address, if there's none. 733 */ 734 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 735 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 736 ia = in6ifa_ifpforlinklocal(ifp, 0); 737 if (ia == NULL) 738 in6_ifattach_linklocal(ifp, altifp); 739 else 740 ifa_free(&ia->ia_ifa); 741 } 742 743 /* update dynamically. */ 744 if (V_in6_maxmtu < ifp->if_mtu) 745 V_in6_maxmtu = ifp->if_mtu; 746 } 747 748 /* 749 * NOTE: in6_ifdetach() does not support loopback if at this moment. 750 * 751 * When shutting down a VNET we clean up layers top-down. In that case 752 * upper layer protocols (ulp) are cleaned up already and locks are destroyed 753 * and we must not call into these cleanup functions anymore, thus purgeulp 754 * is set to 0 in that case by in6_ifdetach_destroy(). 755 * The normal case of destroying a (cloned) interface still needs to cleanup 756 * everything related to the interface and will have purgeulp set to 1. 757 */ 758 static void 759 _in6_ifdetach(struct ifnet *ifp, int purgeulp) 760 { 761 struct ifaddr *ifa, *next; 762 763 if (ifp->if_afdata[AF_INET6] == NULL) 764 return; 765 766 /* 767 * nuke any of IPv6 addresses we have 768 */ 769 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 770 if (ifa->ifa_addr->sa_family != AF_INET6) 771 continue; 772 in6_purgeaddr(ifa); 773 } 774 if (purgeulp) { 775 IN6_MULTI_LOCK(); 776 in6_pcbpurgeif0(&V_udbinfo, ifp); 777 in6_pcbpurgeif0(&V_ulitecbinfo, ifp); 778 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 779 IN6_MULTI_UNLOCK(); 780 } 781 /* leave from all multicast groups joined */ 782 in6_purgemaddrs(ifp); 783 784 /* 785 * Remove neighbor management table. 786 * Enabling the nd6_purge will panic on vmove for interfaces on VNET 787 * teardown as the IPv6 layer is cleaned up already and the locks 788 * are destroyed. 789 */ 790 if (purgeulp) 791 nd6_purge(ifp); 792 } 793 794 void 795 in6_ifdetach(struct ifnet *ifp) 796 { 797 798 _in6_ifdetach(ifp, 1); 799 } 800 801 void 802 in6_ifdetach_destroy(struct ifnet *ifp) 803 { 804 805 _in6_ifdetach(ifp, 0); 806 } 807 808 int 809 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 810 const u_int8_t *baseid, int generate) 811 { 812 u_int8_t nullbuf[8]; 813 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 814 815 bzero(nullbuf, sizeof(nullbuf)); 816 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 817 /* we've never created a random ID. Create a new one. */ 818 generate = 1; 819 } 820 821 if (generate) { 822 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 823 824 /* generate_tmp_ifid will update seedn and buf */ 825 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 826 ndi->randomid); 827 } 828 bcopy(ndi->randomid, retbuf, 8); 829 830 return (0); 831 } 832 833 void 834 in6_tmpaddrtimer(void *arg) 835 { 836 CURVNET_SET((struct vnet *) arg); 837 struct nd_ifinfo *ndi; 838 u_int8_t nullbuf[8]; 839 struct ifnet *ifp; 840 841 callout_reset(&V_in6_tmpaddrtimer_ch, 842 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 843 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 844 845 bzero(nullbuf, sizeof(nullbuf)); 846 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 847 if (ifp->if_afdata[AF_INET6] == NULL) 848 continue; 849 ndi = ND_IFINFO(ifp); 850 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 851 /* 852 * We've been generating a random ID on this interface. 853 * Create a new one. 854 */ 855 (void)generate_tmp_ifid(ndi->randomseed0, 856 ndi->randomseed1, ndi->randomid); 857 } 858 } 859 860 CURVNET_RESTORE(); 861 } 862 863 static void 864 in6_purgemaddrs(struct ifnet *ifp) 865 { 866 struct in6_multi_head inmh; 867 868 SLIST_INIT(&inmh); 869 IN6_MULTI_LOCK(); 870 IN6_MULTI_LIST_LOCK(); 871 mld_ifdetach(ifp, &inmh); 872 IN6_MULTI_LIST_UNLOCK(); 873 IN6_MULTI_UNLOCK(); 874 in6m_release_list_deferred(&inmh); 875 876 /* 877 * Make sure all multicast deletions invoking if_ioctl() are 878 * completed before returning. Else we risk accessing a freed 879 * ifnet structure pointer. 880 */ 881 in6m_release_wait(NULL); 882 } 883 884 void 885 in6_ifattach_destroy(void) 886 { 887 888 callout_drain(&V_in6_tmpaddrtimer_ch); 889 } 890 891 static void 892 in6_ifattach_init(void *dummy) 893 { 894 895 /* Timer for regeneranation of temporary addresses randomize ID. */ 896 callout_init(&V_in6_tmpaddrtimer_ch, 0); 897 callout_reset(&V_in6_tmpaddrtimer_ch, 898 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 899 V_ip6_temp_regen_advance) * hz, 900 in6_tmpaddrtimer, curvnet); 901 } 902 903 /* 904 * Cheat. 905 * This must be after route_init(), which is now SI_ORDER_THIRD. 906 */ 907 SYSINIT(in6_ifattach_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 908 in6_ifattach_init, NULL);
Cache object: 2e9551591f5a2e09017cf8026fd08416
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