in6_ifattach.c revision 287731
1139823Simp/*- 2103026Ssobomax * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3284066Sae * All rights reserved. 4103026Ssobomax * 5103026Ssobomax * Redistribution and use in source and binary forms, with or without 6103026Ssobomax * modification, are permitted provided that the following conditions 7103026Ssobomax * are met: 8103026Ssobomax * 1. Redistributions of source code must retain the above copyright 9148613Sbz * notice, this list of conditions and the following disclaimer. 10148613Sbz * 2. Redistributions in binary form must reproduce the above copyright 11103026Ssobomax * notice, this list of conditions and the following disclaimer in the 12103026Ssobomax * documentation and/or other materials provided with the distribution. 13103026Ssobomax * 3. Neither the name of the project nor the names of its contributors 14103026Ssobomax * may be used to endorse or promote products derived from this software 15103026Ssobomax * without specific prior written permission. 16103026Ssobomax * 17103026Ssobomax * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18103026Ssobomax * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19103026Ssobomax * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20103026Ssobomax * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21103026Ssobomax * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22103026Ssobomax * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23103026Ssobomax * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24103026Ssobomax * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25103026Ssobomax * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26103026Ssobomax * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27103026Ssobomax * SUCH DAMAGE. 28103026Ssobomax * 29103026Ssobomax * $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $ 30103026Ssobomax */ 31284066Sae 32284066Sae#include <sys/cdefs.h> 33103026Ssobomax__FBSDID("$FreeBSD: stable/10/sys/netinet6/in6_ifattach.c 287731 2015-09-13 01:39:37Z hrs $"); 34103026Ssobomax 35172467Ssilby#include <sys/param.h> 36172467Ssilby#include <sys/systm.h> 37172467Ssilby#include <sys/malloc.h> 38103026Ssobomax#include <sys/socket.h> 39148613Sbz#include <sys/sockio.h> 40103026Ssobomax#include <sys/jail.h> 41103026Ssobomax#include <sys/kernel.h> 42103026Ssobomax#include <sys/proc.h> 43103026Ssobomax#include <sys/syslog.h> 44103026Ssobomax#include <sys/md5.h> 45103026Ssobomax 46103026Ssobomax#include <net/if.h> 47103026Ssobomax#include <net/if_dl.h> 48103026Ssobomax#include <net/if_types.h> 49103026Ssobomax#include <net/route.h> 50284066Sae#include <net/vnet.h> 51284066Sae 52284066Sae#include <netinet/in.h> 53103026Ssobomax#include <netinet/in_var.h> 54103026Ssobomax#include <netinet/if_ether.h> 55284066Sae#include <netinet/in_pcb.h> 56284066Sae#include <netinet/ip_var.h> 57103026Ssobomax#include <netinet/udp.h> 58103026Ssobomax#include <netinet/udp_var.h> 59103026Ssobomax 60103026Ssobomax#include <netinet/ip6.h> 61103026Ssobomax#include <netinet6/ip6_var.h> 62103026Ssobomax#include <netinet6/in6_var.h> 63284066Sae#include <netinet6/in6_pcb.h> 64103026Ssobomax#include <netinet6/in6_ifattach.h> 65103026Ssobomax#include <netinet6/ip6_var.h> 66103026Ssobomax#include <netinet6/nd6.h> 67284066Sae#include <netinet6/mld6_var.h> 68284066Sae#include <netinet6/scope6_var.h> 69103026Ssobomax 70103026SsobomaxVNET_DEFINE(unsigned long, in6_maxmtu) = 0; 71103026Ssobomax 72103026Ssobomax#ifdef IP6_AUTO_LINKLOCAL 73103026SsobomaxVNET_DEFINE(int, ip6_auto_linklocal) = IP6_AUTO_LINKLOCAL; 74103026Ssobomax#else 75284066SaeVNET_DEFINE(int, ip6_auto_linklocal) = 1; /* enabled by default */ 76284066Sae#endif 77284066Sae 78284066SaeVNET_DEFINE(struct callout, in6_tmpaddrtimer_ch); 79284066Sae#define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch) 80284066Sae 81284066SaeVNET_DECLARE(struct inpcbinfo, ripcbinfo); 82284066Sae#define V_ripcbinfo VNET(ripcbinfo) 83284066Sae 84284066Saestatic int get_rand_ifid(struct ifnet *, struct in6_addr *); 85284066Saestatic int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 86284066Saestatic int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 87284066Saestatic int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 88103026Ssobomaxstatic int in6_ifattach_loopback(struct ifnet *); 89284066Saestatic void in6_purgemaddrs(struct ifnet *); 90284066Sae 91284066Sae#define EUI64_GBIT 0x01 92284066Sae#define EUI64_UBIT 0x02 93284066Sae#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 94284066Sae#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 95284066Sae#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 96284066Sae#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 97103026Ssobomax#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 98158645Sglebius 99103026Ssobomax#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 100103026Ssobomax#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 101284066Sae 102103026Ssobomax/* 103103026Ssobomax * Generate a last-resort interface identifier, when the machine has no 104284066Sae * IEEE802/EUI64 address sources. 105284066Sae * The goal here is to get an interface identifier that is 106103026Ssobomax * (1) random enough and (2) does not change across reboot. 107284066Sae * We currently use MD5(hostname) for it. 108103026Ssobomax * 109284066Sae * in6 - upper 64bits are preserved 110103026Ssobomax */ 111284066Saestatic int 112284066Saeget_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 113284066Sae{ 114103026Ssobomax MD5_CTX ctxt; 115284066Sae struct prison *pr; 116284066Sae u_int8_t digest[16]; 117284066Sae int hostnamelen; 118284066Sae 119284066Sae pr = curthread->td_ucred->cr_prison; 120284066Sae mtx_lock(&pr->pr_mtx); 121284066Sae hostnamelen = strlen(pr->pr_hostname); 122123992Ssobomax#if 0 123284066Sae /* we need at least several letters as seed for ifid */ 124284066Sae if (hostnamelen < 3) { 125284066Sae mtx_unlock(&pr->pr_mtx); 126103026Ssobomax return -1; 127284066Sae } 128284066Sae#endif 129103026Ssobomax 130284066Sae /* generate 8 bytes of pseudo-random value. */ 131284066Sae bzero(&ctxt, sizeof(ctxt)); 132284066Sae MD5Init(&ctxt); 133284066Sae MD5Update(&ctxt, pr->pr_hostname, hostnamelen); 134103026Ssobomax mtx_unlock(&pr->pr_mtx); 135284066Sae MD5Final(digest, &ctxt); 136284066Sae 137284066Sae /* assumes sizeof(digest) > sizeof(ifid) */ 138284066Sae bcopy(digest, &in6->s6_addr[8], 8); 139284066Sae 140103026Ssobomax /* make sure to set "u" bit to local, and "g" bit to individual. */ 141103026Ssobomax in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 142284066Sae in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 143284066Sae 144103026Ssobomax /* convert EUI64 into IPv6 interface identifier */ 145284066Sae EUI64_TO_IFID(in6); 146103026Ssobomax 147284066Sae return 0; 148284066Sae} 149284066Sae 150284066Saestatic int 151284066Saegenerate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 152284066Sae{ 153284066Sae MD5_CTX ctxt; 154284066Sae u_int8_t seed[16], digest[16], nullbuf[8]; 155284066Sae u_int32_t val32; 156284066Sae 157284066Sae /* If there's no history, start with a random seed. */ 158284066Sae bzero(nullbuf, sizeof(nullbuf)); 159284066Sae if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 160284066Sae int i; 161284066Sae 162284066Sae for (i = 0; i < 2; i++) { 163284066Sae val32 = arc4random(); 164284066Sae bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 165284066Sae } 166103026Ssobomax } else 167284066Sae bcopy(seed0, seed, 8); 168284066Sae 169284066Sae /* copy the right-most 64-bits of the given address */ 170103026Ssobomax /* XXX assumption on the size of IFID */ 171103026Ssobomax bcopy(seed1, &seed[8], 8); 172284066Sae 173284066Sae if (0) { /* for debugging purposes only */ 174103026Ssobomax int i; 175103026Ssobomax 176284066Sae printf("generate_tmp_ifid: new randomized ID from: "); 177284066Sae for (i = 0; i < 16; i++) 178284066Sae printf("%02x", seed[i]); 179284066Sae printf(" "); 180284066Sae } 181284066Sae 182103026Ssobomax /* generate 16 bytes of pseudo-random value. */ 183 bzero(&ctxt, sizeof(ctxt)); 184 MD5Init(&ctxt); 185 MD5Update(&ctxt, seed, sizeof(seed)); 186 MD5Final(digest, &ctxt); 187 188 /* 189 * RFC 3041 3.2.1. (3) 190 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 191 * left-most bit is numbered 0) to zero. 192 */ 193 bcopy(digest, ret, 8); 194 ret[0] &= ~EUI64_UBIT; 195 196 /* 197 * XXX: we'd like to ensure that the generated value is not zero 198 * for simplicity. If the caclculated digest happens to be zero, 199 * use a random non-zero value as the last resort. 200 */ 201 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 202 nd6log((LOG_INFO, 203 "generate_tmp_ifid: computed MD5 value is zero.\n")); 204 205 val32 = arc4random(); 206 val32 = 1 + (val32 % (0xffffffff - 1)); 207 } 208 209 /* 210 * RFC 3041 3.2.1. (4) 211 * Take the rightmost 64-bits of the MD5 digest and save them in 212 * stable storage as the history value to be used in the next 213 * iteration of the algorithm. 214 */ 215 bcopy(&digest[8], seed0, 8); 216 217 if (0) { /* for debugging purposes only */ 218 int i; 219 220 printf("to: "); 221 for (i = 0; i < 16; i++) 222 printf("%02x", digest[i]); 223 printf("\n"); 224 } 225 226 return 0; 227} 228 229/* 230 * Get interface identifier for the specified interface. 231 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 232 * 233 * in6 - upper 64bits are preserved 234 */ 235int 236in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 237{ 238 struct ifaddr *ifa; 239 struct sockaddr_dl *sdl; 240 u_int8_t *addr; 241 size_t addrlen; 242 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 243 static u_int8_t allone[8] = 244 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 245 246 IF_ADDR_RLOCK(ifp); 247 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 248 if (ifa->ifa_addr->sa_family != AF_LINK) 249 continue; 250 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 251 if (sdl == NULL) 252 continue; 253 if (sdl->sdl_alen == 0) 254 continue; 255 256 goto found; 257 } 258 IF_ADDR_RUNLOCK(ifp); 259 260 return -1; 261 262found: 263 IF_ADDR_LOCK_ASSERT(ifp); 264 addr = LLADDR(sdl); 265 addrlen = sdl->sdl_alen; 266 267 /* get EUI64 */ 268 switch (ifp->if_type) { 269 case IFT_BRIDGE: 270 case IFT_ETHER: 271 case IFT_L2VLAN: 272 case IFT_FDDI: 273 case IFT_ISO88025: 274 case IFT_ATM: 275 case IFT_IEEE1394: 276#ifdef IFT_IEEE80211 277 case IFT_IEEE80211: 278#endif 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_ARCNET: 320 if (addrlen != 1) { 321 IF_ADDR_RUNLOCK(ifp); 322 return -1; 323 } 324 if (!addr[0]) { 325 IF_ADDR_RUNLOCK(ifp); 326 return -1; 327 } 328 329 bzero(&in6->s6_addr[8], 8); 330 in6->s6_addr[15] = addr[0]; 331 332 /* 333 * due to insufficient bitwidth, we mark it local. 334 */ 335 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 336 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 337 break; 338 339 case IFT_GIF: 340#ifdef IFT_STF 341 case IFT_STF: 342#endif 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 */ 387static int 388get_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_list) { 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 440success: 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 */ 451static int 452in6_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 int i, error; 458 459 /* 460 * configure link-local address. 461 */ 462 bzero(&ifra, sizeof(ifra)); 463 464 /* 465 * in6_update_ifa() does not use ifra_name, but we accurately set it 466 * for safety. 467 */ 468 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 469 470 ifra.ifra_addr.sin6_family = AF_INET6; 471 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 472 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 473 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 474 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 475 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 476 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 477 } else { 478 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 479 nd6log((LOG_ERR, 480 "%s: no ifid available\n", if_name(ifp))); 481 return (-1); 482 } 483 } 484 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 485 return (-1); 486 487 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 488 ifra.ifra_prefixmask.sin6_family = AF_INET6; 489 ifra.ifra_prefixmask.sin6_addr = in6mask64; 490 /* link-local addresses should NEVER expire. */ 491 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 492 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 493 494 /* 495 * Now call in6_update_ifa() to do a bunch of procedures to configure 496 * a link-local address. We can set the 3rd argument to NULL, because 497 * we know there's no other link-local address on the interface 498 * and therefore we are adding one (instead of updating one). 499 */ 500 if ((error = in6_update_ifa(ifp, &ifra, NULL, 501 IN6_IFAUPDATE_DADDELAY)) != 0) { 502 /* 503 * XXX: When the interface does not support IPv6, this call 504 * would fail in the SIOCSIFADDR ioctl. I believe the 505 * notification is rather confusing in this case, so just 506 * suppress it. (jinmei@kame.net 20010130) 507 */ 508 if (error != EAFNOSUPPORT) 509 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 510 "configure a link-local address on %s " 511 "(errno=%d)\n", 512 if_name(ifp), error)); 513 return (-1); 514 } 515 516 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 517 KASSERT(ia != NULL, ("%s: ia == NULL, ifp=%p", __func__, ifp)); 518 519 ifa_free(&ia->ia_ifa); 520 521 /* 522 * Make the link-local prefix (fe80::%link/64) as on-link. 523 * Since we'd like to manage prefixes separately from addresses, 524 * we make an ND6 prefix structure for the link-local prefix, 525 * and add it to the prefix list as a never-expire prefix. 526 * XXX: this change might affect some existing code base... 527 */ 528 bzero(&pr0, sizeof(pr0)); 529 pr0.ndpr_ifp = ifp; 530 /* this should be 64 at this moment. */ 531 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 532 pr0.ndpr_prefix = ifra.ifra_addr; 533 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 534 for (i = 0; i < 4; i++) { 535 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 536 in6mask64.s6_addr32[i]; 537 } 538 /* 539 * Initialize parameters. The link-local prefix must always be 540 * on-link, and its lifetimes never expire. 541 */ 542 pr0.ndpr_raf_onlink = 1; 543 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 544 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 545 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 546 /* 547 * Since there is no other link-local addresses, nd6_prefix_lookup() 548 * probably returns NULL. However, we cannot always expect the result. 549 * For example, if we first remove the (only) existing link-local 550 * address, and then reconfigure another one, the prefix is still 551 * valid with referring to the old link-local address. 552 */ 553 if (nd6_prefix_lookup(&pr0) == NULL) { 554 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 555 return (error); 556 } 557 558 return 0; 559} 560 561/* 562 * ifp - must be IFT_LOOP 563 */ 564static int 565in6_ifattach_loopback(struct ifnet *ifp) 566{ 567 struct in6_aliasreq ifra; 568 int error; 569 570 bzero(&ifra, sizeof(ifra)); 571 572 /* 573 * in6_update_ifa() does not use ifra_name, but we accurately set it 574 * for safety. 575 */ 576 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 577 578 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 579 ifra.ifra_prefixmask.sin6_family = AF_INET6; 580 ifra.ifra_prefixmask.sin6_addr = in6mask128; 581 582 /* 583 * Always initialize ia_dstaddr (= broadcast address) to loopback 584 * address. Follows IPv4 practice - see in_ifinit(). 585 */ 586 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 587 ifra.ifra_dstaddr.sin6_family = AF_INET6; 588 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 589 590 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 591 ifra.ifra_addr.sin6_family = AF_INET6; 592 ifra.ifra_addr.sin6_addr = in6addr_loopback; 593 594 /* the loopback address should NEVER expire. */ 595 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 596 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 597 598 /* we don't need to perform DAD on loopback interfaces. */ 599 ifra.ifra_flags |= IN6_IFF_NODAD; 600 601 /* 602 * We are sure that this is a newly assigned address, so we can set 603 * NULL to the 3rd arg. 604 */ 605 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 606 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 607 "the loopback address on %s (errno=%d)\n", 608 if_name(ifp), error)); 609 return (-1); 610 } 611 612 return 0; 613} 614 615/* 616 * compute NI group address, based on the current hostname setting. 617 * see RFC 4620. 618 * 619 * when ifp == NULL, the caller is responsible for filling scopeid. 620 * 621 * If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address 622 * while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620. 623 */ 624static int 625in6_nigroup0(struct ifnet *ifp, const char *name, int namelen, 626 struct in6_addr *in6, int oldmcprefix) 627{ 628 struct prison *pr; 629 const char *p; 630 u_char *q; 631 MD5_CTX ctxt; 632 u_int8_t digest[16]; 633 char l; 634 char n[64]; /* a single label must not exceed 63 chars */ 635 636 /* 637 * If no name is given and namelen is -1, 638 * we try to do the hostname lookup ourselves. 639 */ 640 if (!name && namelen == -1) { 641 pr = curthread->td_ucred->cr_prison; 642 mtx_lock(&pr->pr_mtx); 643 name = pr->pr_hostname; 644 namelen = strlen(name); 645 } else 646 pr = NULL; 647 if (!name || !namelen) { 648 if (pr != NULL) 649 mtx_unlock(&pr->pr_mtx); 650 return -1; 651 } 652 653 p = name; 654 while (p && *p && *p != '.' && p - name < namelen) 655 p++; 656 if (p == name || p - name > sizeof(n) - 1) { 657 if (pr != NULL) 658 mtx_unlock(&pr->pr_mtx); 659 return -1; /* label too long */ 660 } 661 l = p - name; 662 strncpy(n, name, l); 663 if (pr != NULL) 664 mtx_unlock(&pr->pr_mtx); 665 n[(int)l] = '\0'; 666 for (q = n; *q; q++) { 667 if ('A' <= *q && *q <= 'Z') 668 *q = *q - 'A' + 'a'; 669 } 670 671 /* generate 16 bytes of pseudo-random value. */ 672 bzero(&ctxt, sizeof(ctxt)); 673 MD5Init(&ctxt); 674 MD5Update(&ctxt, &l, sizeof(l)); 675 MD5Update(&ctxt, n, l); 676 MD5Final(digest, &ctxt); 677 678 bzero(in6, sizeof(*in6)); 679 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 680 in6->s6_addr8[11] = 2; 681 if (oldmcprefix == 0) { 682 in6->s6_addr8[12] = 0xff; 683 /* Copy the first 24 bits of 128-bit hash into the address. */ 684 bcopy(digest, &in6->s6_addr8[13], 3); 685 } else { 686 /* Copy the first 32 bits of 128-bit hash into the address. */ 687 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 688 } 689 if (in6_setscope(in6, ifp, NULL)) 690 return (-1); /* XXX: should not fail */ 691 692 return 0; 693} 694 695int 696in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 697 struct in6_addr *in6) 698{ 699 700 return (in6_nigroup0(ifp, name, namelen, in6, 0)); 701} 702 703int 704in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen, 705 struct in6_addr *in6) 706{ 707 708 return (in6_nigroup0(ifp, name, namelen, in6, 1)); 709} 710 711/* 712 * XXX multiple loopback interface needs more care. for instance, 713 * nodelocal address needs to be configured onto only one of them. 714 * XXX multiple link-local address case 715 * 716 * altifp - secondary EUI64 source 717 */ 718void 719in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 720{ 721 struct in6_ifaddr *ia; 722 struct in6_addr in6; 723 724 if (ifp->if_afdata[AF_INET6] == NULL) 725 return; 726 /* 727 * quirks based on interface type 728 */ 729 switch (ifp->if_type) { 730 case IFT_STF: 731 /* 732 * 6to4 interface is a very special kind of beast. 733 * no multicast, no linklocal. RFC2529 specifies how to make 734 * linklocals for 6to4 interface, but there's no use and 735 * it is rather harmful to have one. 736 */ 737 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 738 break; 739 default: 740 break; 741 } 742 743 /* 744 * usually, we require multicast capability to the interface 745 */ 746 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 747 nd6log((LOG_INFO, "in6_ifattach: " 748 "%s is not multicast capable, IPv6 not enabled\n", 749 if_name(ifp))); 750 return; 751 } 752 753 /* 754 * assign loopback address for loopback interface. 755 * XXX multiple loopback interface case. 756 */ 757 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 758 struct ifaddr *ifa; 759 760 in6 = in6addr_loopback; 761 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6); 762 if (ifa == NULL) { 763 if (in6_ifattach_loopback(ifp) != 0) 764 return; 765 } else 766 ifa_free(ifa); 767 } 768 769 /* 770 * assign a link-local address, if there's none. 771 */ 772 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 773 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 774 int error; 775 776 ia = in6ifa_ifpforlinklocal(ifp, 0); 777 if (ia == NULL) { 778 error = in6_ifattach_linklocal(ifp, altifp); 779#if 0 780 if (error) 781 log(LOG_NOTICE, "in6_ifattach_linklocal: " 782 "failed to add a link-local addr to %s\n", 783 if_name(ifp)); 784#endif 785 } else 786 ifa_free(&ia->ia_ifa); 787 } 788 789 /* update dynamically. */ 790 if (V_in6_maxmtu < ifp->if_mtu) 791 V_in6_maxmtu = ifp->if_mtu; 792} 793 794/* 795 * NOTE: in6_ifdetach() does not support loopback if at this moment. 796 * We don't need this function in bsdi, because interfaces are never removed 797 * from the ifnet list in bsdi. 798 */ 799void 800in6_ifdetach(struct ifnet *ifp) 801{ 802 struct in6_ifaddr *ia; 803 struct ifaddr *ifa, *next; 804 struct radix_node_head *rnh; 805 struct rtentry *rt; 806 struct sockaddr_in6 sin6; 807 struct in6_multi_mship *imm; 808 809 if (ifp->if_afdata[AF_INET6] == NULL) 810 return; 811 812 /* remove neighbor management table */ 813 nd6_purge(ifp); 814 815 /* nuke any of IPv6 addresses we have */ 816 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 817 if (ifa->ifa_addr->sa_family != AF_INET6) 818 continue; 819 in6_purgeaddr(ifa); 820 } 821 822 /* undo everything done by in6_ifattach(), just in case */ 823 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 824 if (ifa->ifa_addr->sa_family != AF_INET6 825 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 826 continue; 827 } 828 829 ia = (struct in6_ifaddr *)ifa; 830 831 /* 832 * leave from multicast groups we have joined for the interface 833 */ 834 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 835 LIST_REMOVE(imm, i6mm_chain); 836 in6_leavegroup(imm); 837 } 838 839 /* Remove link-local from the routing table. */ 840 if (ia->ia_flags & IFA_ROUTE) 841 (void)rtinit(&ia->ia_ifa, RTM_DELETE, ia->ia_flags); 842 843 /* remove from the linked list */ 844 IF_ADDR_WLOCK(ifp); 845 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 846 IF_ADDR_WUNLOCK(ifp); 847 ifa_free(ifa); /* if_addrhead */ 848 849 IN6_IFADDR_WLOCK(); 850 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 851 IN6_IFADDR_WUNLOCK(); 852 ifa_free(ifa); 853 } 854 855 in6_pcbpurgeif0(&V_udbinfo, ifp); 856 in6_pcbpurgeif0(&V_ulitecbinfo, ifp); 857 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 858 /* leave from all multicast groups joined */ 859 in6_purgemaddrs(ifp); 860 861 /* 862 * remove neighbor management table. we call it twice just to make 863 * sure we nuke everything. maybe we need just one call. 864 * XXX: since the first call did not release addresses, some prefixes 865 * might remain. We should call nd6_purge() again to release the 866 * prefixes after removing all addresses above. 867 * (Or can we just delay calling nd6_purge until at this point?) 868 */ 869 nd6_purge(ifp); 870 871 /* 872 * Remove route to link-local allnodes multicast (ff02::1). 873 * These only get automatically installed for the default FIB. 874 */ 875 bzero(&sin6, sizeof(sin6)); 876 sin6.sin6_len = sizeof(struct sockaddr_in6); 877 sin6.sin6_family = AF_INET6; 878 sin6.sin6_addr = in6addr_linklocal_allnodes; 879 if (in6_setscope(&sin6.sin6_addr, ifp, NULL)) 880 /* XXX: should not fail */ 881 return; 882 /* XXX grab lock first to avoid LOR */ 883 rnh = rt_tables_get_rnh(RT_DEFAULT_FIB, AF_INET6); 884 if (rnh != NULL) { 885 RADIX_NODE_HEAD_LOCK(rnh); 886 rt = in6_rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED, 887 RT_DEFAULT_FIB); 888 if (rt) { 889 if (rt->rt_ifp == ifp) 890 rtexpunge(rt); 891 RTFREE_LOCKED(rt); 892 } 893 RADIX_NODE_HEAD_UNLOCK(rnh); 894 } 895} 896 897int 898in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 899 const u_int8_t *baseid, int generate) 900{ 901 u_int8_t nullbuf[8]; 902 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 903 904 bzero(nullbuf, sizeof(nullbuf)); 905 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 906 /* we've never created a random ID. Create a new one. */ 907 generate = 1; 908 } 909 910 if (generate) { 911 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 912 913 /* generate_tmp_ifid will update seedn and buf */ 914 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 915 ndi->randomid); 916 } 917 bcopy(ndi->randomid, retbuf, 8); 918 919 return (0); 920} 921 922void 923in6_tmpaddrtimer(void *arg) 924{ 925 CURVNET_SET((struct vnet *) arg); 926 struct nd_ifinfo *ndi; 927 u_int8_t nullbuf[8]; 928 struct ifnet *ifp; 929 930 callout_reset(&V_in6_tmpaddrtimer_ch, 931 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 932 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 933 934 bzero(nullbuf, sizeof(nullbuf)); 935 TAILQ_FOREACH(ifp, &V_ifnet, if_list) { 936 if (ifp->if_afdata[AF_INET6] == NULL) 937 continue; 938 ndi = ND_IFINFO(ifp); 939 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 940 /* 941 * We've been generating a random ID on this interface. 942 * Create a new one. 943 */ 944 (void)generate_tmp_ifid(ndi->randomseed0, 945 ndi->randomseed1, ndi->randomid); 946 } 947 } 948 949 CURVNET_RESTORE(); 950} 951 952static void 953in6_purgemaddrs(struct ifnet *ifp) 954{ 955 LIST_HEAD(,in6_multi) purgeinms; 956 struct in6_multi *inm, *tinm; 957 struct ifmultiaddr *ifma; 958 959 LIST_INIT(&purgeinms); 960 IN6_MULTI_LOCK(); 961 962 /* 963 * Extract list of in6_multi associated with the detaching ifp 964 * which the PF_INET6 layer is about to release. 965 * We need to do this as IF_ADDR_LOCK() may be re-acquired 966 * by code further down. 967 */ 968 IF_ADDR_RLOCK(ifp); 969 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 970 if (ifma->ifma_addr->sa_family != AF_INET6 || 971 ifma->ifma_protospec == NULL) 972 continue; 973 inm = (struct in6_multi *)ifma->ifma_protospec; 974 LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry); 975 } 976 IF_ADDR_RUNLOCK(ifp); 977 978 LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) { 979 LIST_REMOVE(inm, in6m_entry); 980 in6m_release_locked(inm); 981 } 982 mld_ifdetach(ifp); 983 984 IN6_MULTI_UNLOCK(); 985} 986