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sys/netinet6/in6_ifattach.c
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1 /*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $ 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD: releng/11.0/sys/netinet6/in6_ifattach.c 302054 2016-06-21 13:48:49Z bz $"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/malloc.h> 38 #include <sys/socket.h> 39 #include <sys/sockio.h> 40 #include <sys/jail.h> 41 #include <sys/kernel.h> 42 #include <sys/lock.h> 43 #include <sys/proc.h> 44 #include <sys/rmlock.h> 45 #include <sys/syslog.h> 46 #include <sys/md5.h> 47 48 #include <net/if.h> 49 #include <net/if_var.h> 50 #include <net/if_dl.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 IF_ADDR_RLOCK(ifp); 250 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 251 if (ifa->ifa_addr->sa_family != AF_LINK) 252 continue; 253 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 254 if (sdl == NULL) 255 continue; 256 if (sdl->sdl_alen == 0) 257 continue; 258 259 goto found; 260 } 261 IF_ADDR_RUNLOCK(ifp); 262 263 return -1; 264 265 found: 266 IF_ADDR_LOCK_ASSERT(ifp); 267 addr = LLADDR(sdl); 268 addrlen = sdl->sdl_alen; 269 270 /* get EUI64 */ 271 switch (ifp->if_type) { 272 case IFT_BRIDGE: 273 case IFT_ETHER: 274 case IFT_L2VLAN: 275 case IFT_FDDI: 276 case IFT_ISO88025: 277 case IFT_ATM: 278 case IFT_IEEE1394: 279 case IFT_IEEE80211: 280 /* IEEE802/EUI64 cases - what others? */ 281 /* IEEE1394 uses 16byte length address starting with EUI64 */ 282 if (addrlen > 8) 283 addrlen = 8; 284 285 /* look at IEEE802/EUI64 only */ 286 if (addrlen != 8 && addrlen != 6) { 287 IF_ADDR_RUNLOCK(ifp); 288 return -1; 289 } 290 291 /* 292 * check for invalid MAC address - on bsdi, we see it a lot 293 * since wildboar configures all-zero MAC on pccard before 294 * card insertion. 295 */ 296 if (bcmp(addr, allzero, addrlen) == 0) { 297 IF_ADDR_RUNLOCK(ifp); 298 return -1; 299 } 300 if (bcmp(addr, allone, addrlen) == 0) { 301 IF_ADDR_RUNLOCK(ifp); 302 return -1; 303 } 304 305 /* make EUI64 address */ 306 if (addrlen == 8) 307 bcopy(addr, &in6->s6_addr[8], 8); 308 else if (addrlen == 6) { 309 in6->s6_addr[8] = addr[0]; 310 in6->s6_addr[9] = addr[1]; 311 in6->s6_addr[10] = addr[2]; 312 in6->s6_addr[11] = 0xff; 313 in6->s6_addr[12] = 0xfe; 314 in6->s6_addr[13] = addr[3]; 315 in6->s6_addr[14] = addr[4]; 316 in6->s6_addr[15] = addr[5]; 317 } 318 break; 319 320 case IFT_ARCNET: 321 if (addrlen != 1) { 322 IF_ADDR_RUNLOCK(ifp); 323 return -1; 324 } 325 if (!addr[0]) { 326 IF_ADDR_RUNLOCK(ifp); 327 return -1; 328 } 329 330 bzero(&in6->s6_addr[8], 8); 331 in6->s6_addr[15] = addr[0]; 332 333 /* 334 * due to insufficient bitwidth, we mark it local. 335 */ 336 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 337 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 338 break; 339 340 case IFT_GIF: 341 case IFT_STF: 342 /* 343 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 344 * however, IPv4 address is not very suitable as unique 345 * identifier source (can be renumbered). 346 * we don't do this. 347 */ 348 IF_ADDR_RUNLOCK(ifp); 349 return -1; 350 351 default: 352 IF_ADDR_RUNLOCK(ifp); 353 return -1; 354 } 355 356 /* sanity check: g bit must not indicate "group" */ 357 if (EUI64_GROUP(in6)) { 358 IF_ADDR_RUNLOCK(ifp); 359 return -1; 360 } 361 362 /* convert EUI64 into IPv6 interface identifier */ 363 EUI64_TO_IFID(in6); 364 365 /* 366 * sanity check: ifid must not be all zero, avoid conflict with 367 * subnet router anycast 368 */ 369 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 370 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 371 IF_ADDR_RUNLOCK(ifp); 372 return -1; 373 } 374 375 IF_ADDR_RUNLOCK(ifp); 376 return 0; 377 } 378 379 /* 380 * Get interface identifier for the specified interface. If it is not 381 * available on ifp0, borrow interface identifier from other information 382 * sources. 383 * 384 * altifp - secondary EUI64 source 385 */ 386 static int 387 get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 388 struct in6_addr *in6) 389 { 390 struct ifnet *ifp; 391 392 /* first, try to get it from the interface itself */ 393 if (in6_get_hw_ifid(ifp0, in6) == 0) { 394 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 395 if_name(ifp0))); 396 goto success; 397 } 398 399 /* try secondary EUI64 source. this basically is for ATM PVC */ 400 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 401 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 402 if_name(ifp0), if_name(altifp))); 403 goto success; 404 } 405 406 /* next, try to get it from some other hardware interface */ 407 IFNET_RLOCK_NOSLEEP(); 408 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 409 if (ifp == ifp0) 410 continue; 411 if (in6_get_hw_ifid(ifp, in6) != 0) 412 continue; 413 414 /* 415 * to borrow ifid from other interface, ifid needs to be 416 * globally unique 417 */ 418 if (IFID_UNIVERSAL(in6)) { 419 nd6log((LOG_DEBUG, 420 "%s: borrow interface identifier from %s\n", 421 if_name(ifp0), if_name(ifp))); 422 IFNET_RUNLOCK_NOSLEEP(); 423 goto success; 424 } 425 } 426 IFNET_RUNLOCK_NOSLEEP(); 427 428 /* last resort: get from random number source */ 429 if (get_rand_ifid(ifp, in6) == 0) { 430 nd6log((LOG_DEBUG, 431 "%s: interface identifier generated by random number\n", 432 if_name(ifp0))); 433 goto success; 434 } 435 436 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 437 return -1; 438 439 success: 440 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 441 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 442 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 443 in6->s6_addr[14], in6->s6_addr[15])); 444 return 0; 445 } 446 447 /* 448 * altifp - secondary EUI64 source 449 */ 450 static int 451 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 452 { 453 struct in6_ifaddr *ia; 454 struct in6_aliasreq ifra; 455 struct nd_prefixctl pr0; 456 int error; 457 458 /* 459 * configure link-local address. 460 */ 461 in6_prepare_ifra(&ifra, NULL, &in6mask64); 462 463 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 464 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 465 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 466 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 467 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 468 } else { 469 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 470 nd6log((LOG_ERR, 471 "%s: no ifid available\n", if_name(ifp))); 472 return (-1); 473 } 474 } 475 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 476 return (-1); 477 478 /* link-local addresses should NEVER expire. */ 479 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 480 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 481 482 /* 483 * Now call in6_update_ifa() to do a bunch of procedures to configure 484 * a link-local address. We can set the 3rd argument to NULL, because 485 * we know there's no other link-local address on the interface 486 * and therefore we are adding one (instead of updating one). 487 */ 488 if ((error = in6_update_ifa(ifp, &ifra, NULL, 489 IN6_IFAUPDATE_DADDELAY)) != 0) { 490 /* 491 * XXX: When the interface does not support IPv6, this call 492 * would fail in the SIOCSIFADDR ioctl. I believe the 493 * notification is rather confusing in this case, so just 494 * suppress it. (jinmei@kame.net 20010130) 495 */ 496 if (error != EAFNOSUPPORT) 497 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 498 "configure a link-local address on %s " 499 "(errno=%d)\n", 500 if_name(ifp), error)); 501 return (-1); 502 } 503 504 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 505 KASSERT(ia != NULL, ("%s: ia == NULL, ifp=%p", __func__, ifp)); 506 507 ifa_free(&ia->ia_ifa); 508 509 /* 510 * Make the link-local prefix (fe80::%link/64) as on-link. 511 * Since we'd like to manage prefixes separately from addresses, 512 * we make an ND6 prefix structure for the link-local prefix, 513 * and add it to the prefix list as a never-expire prefix. 514 * XXX: this change might affect some existing code base... 515 */ 516 bzero(&pr0, sizeof(pr0)); 517 pr0.ndpr_ifp = ifp; 518 /* this should be 64 at this moment. */ 519 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 520 pr0.ndpr_prefix = ifra.ifra_addr; 521 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 522 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, &in6mask64); 523 /* 524 * Initialize parameters. The link-local prefix must always be 525 * on-link, and its lifetimes never expire. 526 */ 527 pr0.ndpr_raf_onlink = 1; 528 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 529 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 530 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 531 /* 532 * Since there is no other link-local addresses, nd6_prefix_lookup() 533 * probably returns NULL. However, we cannot always expect the result. 534 * For example, if we first remove the (only) existing link-local 535 * address, and then reconfigure another one, the prefix is still 536 * valid with referring to the old link-local address. 537 */ 538 if (nd6_prefix_lookup(&pr0) == NULL) { 539 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 540 return (error); 541 } 542 543 return 0; 544 } 545 546 /* 547 * ifp - must be IFT_LOOP 548 */ 549 static int 550 in6_ifattach_loopback(struct ifnet *ifp) 551 { 552 struct in6_aliasreq ifra; 553 int error; 554 555 in6_prepare_ifra(&ifra, &in6addr_loopback, &in6mask128); 556 557 /* 558 * Always initialize ia_dstaddr (= broadcast address) to loopback 559 * address. Follows IPv4 practice - see in_ifinit(). 560 */ 561 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 562 ifra.ifra_dstaddr.sin6_family = AF_INET6; 563 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 564 565 /* the loopback address should NEVER expire. */ 566 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 567 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 568 569 /* 570 * We are sure that this is a newly assigned address, so we can set 571 * NULL to the 3rd arg. 572 */ 573 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 574 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 575 "the loopback address on %s (errno=%d)\n", 576 if_name(ifp), error)); 577 return (-1); 578 } 579 580 return 0; 581 } 582 583 /* 584 * compute NI group address, based on the current hostname setting. 585 * see RFC 4620. 586 * 587 * when ifp == NULL, the caller is responsible for filling scopeid. 588 * 589 * If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address 590 * while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620. 591 */ 592 static int 593 in6_nigroup0(struct ifnet *ifp, const char *name, int namelen, 594 struct in6_addr *in6, int oldmcprefix) 595 { 596 struct prison *pr; 597 const char *p; 598 u_char *q; 599 MD5_CTX ctxt; 600 u_int8_t digest[16]; 601 char l; 602 char n[64]; /* a single label must not exceed 63 chars */ 603 604 /* 605 * If no name is given and namelen is -1, 606 * we try to do the hostname lookup ourselves. 607 */ 608 if (!name && namelen == -1) { 609 pr = curthread->td_ucred->cr_prison; 610 mtx_lock(&pr->pr_mtx); 611 name = pr->pr_hostname; 612 namelen = strlen(name); 613 } else 614 pr = NULL; 615 if (!name || !namelen) { 616 if (pr != NULL) 617 mtx_unlock(&pr->pr_mtx); 618 return -1; 619 } 620 621 p = name; 622 while (p && *p && *p != '.' && p - name < namelen) 623 p++; 624 if (p == name || p - name > sizeof(n) - 1) { 625 if (pr != NULL) 626 mtx_unlock(&pr->pr_mtx); 627 return -1; /* label too long */ 628 } 629 l = p - name; 630 strncpy(n, name, l); 631 if (pr != NULL) 632 mtx_unlock(&pr->pr_mtx); 633 n[(int)l] = '\0'; 634 for (q = n; *q; q++) { 635 if ('A' <= *q && *q <= 'Z') 636 *q = *q - 'A' + 'a'; 637 } 638 639 /* generate 16 bytes of pseudo-random value. */ 640 bzero(&ctxt, sizeof(ctxt)); 641 MD5Init(&ctxt); 642 MD5Update(&ctxt, &l, sizeof(l)); 643 MD5Update(&ctxt, n, l); 644 MD5Final(digest, &ctxt); 645 646 bzero(in6, sizeof(*in6)); 647 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 648 in6->s6_addr8[11] = 2; 649 if (oldmcprefix == 0) { 650 in6->s6_addr8[12] = 0xff; 651 /* Copy the first 24 bits of 128-bit hash into the address. */ 652 bcopy(digest, &in6->s6_addr8[13], 3); 653 } else { 654 /* Copy the first 32 bits of 128-bit hash into the address. */ 655 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 656 } 657 if (in6_setscope(in6, ifp, NULL)) 658 return (-1); /* XXX: should not fail */ 659 660 return 0; 661 } 662 663 int 664 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 665 struct in6_addr *in6) 666 { 667 668 return (in6_nigroup0(ifp, name, namelen, in6, 0)); 669 } 670 671 int 672 in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen, 673 struct in6_addr *in6) 674 { 675 676 return (in6_nigroup0(ifp, name, namelen, in6, 1)); 677 } 678 679 /* 680 * XXX multiple loopback interface needs more care. for instance, 681 * nodelocal address needs to be configured onto only one of them. 682 * XXX multiple link-local address case 683 * 684 * altifp - secondary EUI64 source 685 */ 686 void 687 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 688 { 689 struct in6_ifaddr *ia; 690 struct in6_addr in6; 691 692 if (ifp->if_afdata[AF_INET6] == NULL) 693 return; 694 /* 695 * quirks based on interface type 696 */ 697 switch (ifp->if_type) { 698 case IFT_STF: 699 /* 700 * 6to4 interface is a very special kind of beast. 701 * no multicast, no linklocal. RFC2529 specifies how to make 702 * linklocals for 6to4 interface, but there's no use and 703 * it is rather harmful to have one. 704 */ 705 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 706 break; 707 default: 708 break; 709 } 710 711 /* 712 * usually, we require multicast capability to the interface 713 */ 714 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 715 nd6log((LOG_INFO, "in6_ifattach: " 716 "%s is not multicast capable, IPv6 not enabled\n", 717 if_name(ifp))); 718 return; 719 } 720 721 /* 722 * assign loopback address for loopback interface. 723 * XXX multiple loopback interface case. 724 */ 725 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 726 struct ifaddr *ifa; 727 728 in6 = in6addr_loopback; 729 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6); 730 if (ifa == NULL) { 731 if (in6_ifattach_loopback(ifp) != 0) 732 return; 733 } else 734 ifa_free(ifa); 735 } 736 737 /* 738 * assign a link-local address, if there's none. 739 */ 740 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 741 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 742 int error; 743 744 ia = in6ifa_ifpforlinklocal(ifp, 0); 745 if (ia == NULL) { 746 error = in6_ifattach_linklocal(ifp, altifp); 747 #if 0 748 if (error) 749 log(LOG_NOTICE, "in6_ifattach_linklocal: " 750 "failed to add a link-local addr to %s\n", 751 if_name(ifp)); 752 #endif 753 } else 754 ifa_free(&ia->ia_ifa); 755 } 756 757 /* update dynamically. */ 758 if (V_in6_maxmtu < ifp->if_mtu) 759 V_in6_maxmtu = ifp->if_mtu; 760 } 761 762 /* 763 * NOTE: in6_ifdetach() does not support loopback if at this moment. 764 * 765 * When shutting down a VNET we clean up layers top-down. In that case 766 * upper layer protocols (ulp) are cleaned up already and locks are destroyed 767 * and we must not call into these cleanup functions anymore, thus purgeulp 768 * is set to 0 in that case by in6_ifdetach_destroy(). 769 * The normal case of destroying a (cloned) interface still needs to cleanup 770 * everything related to the interface and will have purgeulp set to 1. 771 */ 772 static void 773 _in6_ifdetach(struct ifnet *ifp, int purgeulp) 774 { 775 struct ifaddr *ifa, *next; 776 777 if (ifp->if_afdata[AF_INET6] == NULL) 778 return; 779 780 /* 781 * Remove neighbor management table. 782 * Enabling the nd6_purge will panic on vmove for interfaces on VNET 783 * teardown as the IPv6 layer is cleaned up already and the locks 784 * are destroyed. 785 */ 786 if (purgeulp) 787 nd6_purge(ifp); 788 789 /* 790 * nuke any of IPv6 addresses we have 791 * XXX: all addresses should be already removed 792 */ 793 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 794 if (ifa->ifa_addr->sa_family != AF_INET6) 795 continue; 796 in6_purgeaddr(ifa); 797 } 798 if (purgeulp) { 799 in6_pcbpurgeif0(&V_udbinfo, ifp); 800 in6_pcbpurgeif0(&V_ulitecbinfo, ifp); 801 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 802 } 803 /* leave from all multicast groups joined */ 804 in6_purgemaddrs(ifp); 805 806 /* 807 * remove neighbor management table. we call it twice just to make 808 * sure we nuke everything. maybe we need just one call. 809 * XXX: since the first call did not release addresses, some prefixes 810 * might remain. We should call nd6_purge() again to release the 811 * prefixes after removing all addresses above. 812 * (Or can we just delay calling nd6_purge until at this point?) 813 */ 814 if (purgeulp) 815 nd6_purge(ifp); 816 } 817 818 void 819 in6_ifdetach(struct ifnet *ifp) 820 { 821 822 _in6_ifdetach(ifp, 1); 823 } 824 825 void 826 in6_ifdetach_destroy(struct ifnet *ifp) 827 { 828 829 _in6_ifdetach(ifp, 0); 830 } 831 832 int 833 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 834 const u_int8_t *baseid, int generate) 835 { 836 u_int8_t nullbuf[8]; 837 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 838 839 bzero(nullbuf, sizeof(nullbuf)); 840 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 841 /* we've never created a random ID. Create a new one. */ 842 generate = 1; 843 } 844 845 if (generate) { 846 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 847 848 /* generate_tmp_ifid will update seedn and buf */ 849 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 850 ndi->randomid); 851 } 852 bcopy(ndi->randomid, retbuf, 8); 853 854 return (0); 855 } 856 857 void 858 in6_tmpaddrtimer(void *arg) 859 { 860 CURVNET_SET((struct vnet *) arg); 861 struct nd_ifinfo *ndi; 862 u_int8_t nullbuf[8]; 863 struct ifnet *ifp; 864 865 callout_reset(&V_in6_tmpaddrtimer_ch, 866 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 867 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 868 869 bzero(nullbuf, sizeof(nullbuf)); 870 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 871 if (ifp->if_afdata[AF_INET6] == NULL) 872 continue; 873 ndi = ND_IFINFO(ifp); 874 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 875 /* 876 * We've been generating a random ID on this interface. 877 * Create a new one. 878 */ 879 (void)generate_tmp_ifid(ndi->randomseed0, 880 ndi->randomseed1, ndi->randomid); 881 } 882 } 883 884 CURVNET_RESTORE(); 885 } 886 887 static void 888 in6_purgemaddrs(struct ifnet *ifp) 889 { 890 LIST_HEAD(,in6_multi) purgeinms; 891 struct in6_multi *inm, *tinm; 892 struct ifmultiaddr *ifma; 893 894 LIST_INIT(&purgeinms); 895 IN6_MULTI_LOCK(); 896 897 /* 898 * Extract list of in6_multi associated with the detaching ifp 899 * which the PF_INET6 layer is about to release. 900 * We need to do this as IF_ADDR_LOCK() may be re-acquired 901 * by code further down. 902 */ 903 IF_ADDR_RLOCK(ifp); 904 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 905 if (ifma->ifma_addr->sa_family != AF_INET6 || 906 ifma->ifma_protospec == NULL) 907 continue; 908 inm = (struct in6_multi *)ifma->ifma_protospec; 909 LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry); 910 } 911 IF_ADDR_RUNLOCK(ifp); 912 913 LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) { 914 LIST_REMOVE(inm, in6m_entry); 915 in6m_release_locked(inm); 916 } 917 mld_ifdetach(ifp); 918 919 IN6_MULTI_UNLOCK(); 920 } 921 922 void 923 in6_ifattach_destroy(void) 924 { 925 926 callout_drain(&V_in6_tmpaddrtimer_ch); 927 } 928 929 static void 930 in6_ifattach_init(void *dummy) 931 { 932 933 /* Timer for regeneranation of temporary addresses randomize ID. */ 934 callout_init(&V_in6_tmpaddrtimer_ch, 0); 935 callout_reset(&V_in6_tmpaddrtimer_ch, 936 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 937 V_ip6_temp_regen_advance) * hz, 938 in6_tmpaddrtimer, curvnet); 939 } 940 941 /* 942 * Cheat. 943 * This must be after route_init(), which is now SI_ORDER_THIRD. 944 */ 945 SYSINIT(in6_ifattach_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 946 in6_ifattach_init, NULL);
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