in6_ifattach.c revision 287734
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: stable/10/sys/netinet6/in6_ifattach.c 287734 2015-09-13 02:09:06Z hrs $"); 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/proc.h> 43#include <sys/syslog.h> 44#include <sys/md5.h> 45 46#include <net/if.h> 47#include <net/if_dl.h> 48#include <net/if_types.h> 49#include <net/route.h> 50#include <net/vnet.h> 51 52#include <netinet/in.h> 53#include <netinet/in_var.h> 54#include <netinet/if_ether.h> 55#include <netinet/in_pcb.h> 56#include <netinet/ip_var.h> 57#include <netinet/udp.h> 58#include <netinet/udp_var.h> 59 60#include <netinet/ip6.h> 61#include <netinet6/ip6_var.h> 62#include <netinet6/in6_var.h> 63#include <netinet6/in6_pcb.h> 64#include <netinet6/in6_ifattach.h> 65#include <netinet6/ip6_var.h> 66#include <netinet6/nd6.h> 67#include <netinet6/mld6_var.h> 68#include <netinet6/scope6_var.h> 69 70VNET_DEFINE(unsigned long, in6_maxmtu) = 0; 71 72#ifdef IP6_AUTO_LINKLOCAL 73VNET_DEFINE(int, ip6_auto_linklocal) = IP6_AUTO_LINKLOCAL; 74#else 75VNET_DEFINE(int, ip6_auto_linklocal) = 1; /* enabled by default */ 76#endif 77 78VNET_DEFINE(struct callout, in6_tmpaddrtimer_ch); 79#define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch) 80 81VNET_DECLARE(struct inpcbinfo, ripcbinfo); 82#define V_ripcbinfo VNET(ripcbinfo) 83 84static int get_rand_ifid(struct ifnet *, struct in6_addr *); 85static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 86static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 87static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 88static int in6_ifattach_loopback(struct ifnet *); 89static void in6_purgemaddrs(struct ifnet *); 90 91#define EUI64_GBIT 0x01 92#define EUI64_UBIT 0x02 93#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 94#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 95#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 96#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 97#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 98 99#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 100#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 101 102/* 103 * Generate a last-resort interface identifier, when the machine has no 104 * IEEE802/EUI64 address sources. 105 * The goal here is to get an interface identifier that is 106 * (1) random enough and (2) does not change across reboot. 107 * We currently use MD5(hostname) for it. 108 * 109 * in6 - upper 64bits are preserved 110 */ 111static int 112get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 113{ 114 MD5_CTX ctxt; 115 struct prison *pr; 116 u_int8_t digest[16]; 117 int hostnamelen; 118 119 pr = curthread->td_ucred->cr_prison; 120 mtx_lock(&pr->pr_mtx); 121 hostnamelen = strlen(pr->pr_hostname); 122#if 0 123 /* we need at least several letters as seed for ifid */ 124 if (hostnamelen < 3) { 125 mtx_unlock(&pr->pr_mtx); 126 return -1; 127 } 128#endif 129 130 /* generate 8 bytes of pseudo-random value. */ 131 bzero(&ctxt, sizeof(ctxt)); 132 MD5Init(&ctxt); 133 MD5Update(&ctxt, pr->pr_hostname, hostnamelen); 134 mtx_unlock(&pr->pr_mtx); 135 MD5Final(digest, &ctxt); 136 137 /* assumes sizeof(digest) > sizeof(ifid) */ 138 bcopy(digest, &in6->s6_addr[8], 8); 139 140 /* make sure to set "u" bit to local, and "g" bit to individual. */ 141 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 142 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 143 144 /* convert EUI64 into IPv6 interface identifier */ 145 EUI64_TO_IFID(in6); 146 147 return 0; 148} 149 150static int 151generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 152{ 153 MD5_CTX ctxt; 154 u_int8_t seed[16], digest[16], nullbuf[8]; 155 u_int32_t val32; 156 157 /* If there's no history, start with a random seed. */ 158 bzero(nullbuf, sizeof(nullbuf)); 159 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 160 int i; 161 162 for (i = 0; i < 2; i++) { 163 val32 = arc4random(); 164 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 165 } 166 } else 167 bcopy(seed0, seed, 8); 168 169 /* copy the right-most 64-bits of the given address */ 170 /* XXX assumption on the size of IFID */ 171 bcopy(seed1, &seed[8], 8); 172 173 if (0) { /* for debugging purposes only */ 174 int i; 175 176 printf("generate_tmp_ifid: new randomized ID from: "); 177 for (i = 0; i < 16; i++) 178 printf("%02x", seed[i]); 179 printf(" "); 180 } 181 182 /* 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 /* 599 * We are sure that this is a newly assigned address, so we can set 600 * NULL to the 3rd arg. 601 */ 602 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 603 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 604 "the loopback address on %s (errno=%d)\n", 605 if_name(ifp), error)); 606 return (-1); 607 } 608 609 return 0; 610} 611 612/* 613 * compute NI group address, based on the current hostname setting. 614 * see RFC 4620. 615 * 616 * when ifp == NULL, the caller is responsible for filling scopeid. 617 * 618 * If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address 619 * while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620. 620 */ 621static int 622in6_nigroup0(struct ifnet *ifp, const char *name, int namelen, 623 struct in6_addr *in6, int oldmcprefix) 624{ 625 struct prison *pr; 626 const char *p; 627 u_char *q; 628 MD5_CTX ctxt; 629 u_int8_t digest[16]; 630 char l; 631 char n[64]; /* a single label must not exceed 63 chars */ 632 633 /* 634 * If no name is given and namelen is -1, 635 * we try to do the hostname lookup ourselves. 636 */ 637 if (!name && namelen == -1) { 638 pr = curthread->td_ucred->cr_prison; 639 mtx_lock(&pr->pr_mtx); 640 name = pr->pr_hostname; 641 namelen = strlen(name); 642 } else 643 pr = NULL; 644 if (!name || !namelen) { 645 if (pr != NULL) 646 mtx_unlock(&pr->pr_mtx); 647 return -1; 648 } 649 650 p = name; 651 while (p && *p && *p != '.' && p - name < namelen) 652 p++; 653 if (p == name || p - name > sizeof(n) - 1) { 654 if (pr != NULL) 655 mtx_unlock(&pr->pr_mtx); 656 return -1; /* label too long */ 657 } 658 l = p - name; 659 strncpy(n, name, l); 660 if (pr != NULL) 661 mtx_unlock(&pr->pr_mtx); 662 n[(int)l] = '\0'; 663 for (q = n; *q; q++) { 664 if ('A' <= *q && *q <= 'Z') 665 *q = *q - 'A' + 'a'; 666 } 667 668 /* generate 16 bytes of pseudo-random value. */ 669 bzero(&ctxt, sizeof(ctxt)); 670 MD5Init(&ctxt); 671 MD5Update(&ctxt, &l, sizeof(l)); 672 MD5Update(&ctxt, n, l); 673 MD5Final(digest, &ctxt); 674 675 bzero(in6, sizeof(*in6)); 676 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 677 in6->s6_addr8[11] = 2; 678 if (oldmcprefix == 0) { 679 in6->s6_addr8[12] = 0xff; 680 /* Copy the first 24 bits of 128-bit hash into the address. */ 681 bcopy(digest, &in6->s6_addr8[13], 3); 682 } else { 683 /* Copy the first 32 bits of 128-bit hash into the address. */ 684 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 685 } 686 if (in6_setscope(in6, ifp, NULL)) 687 return (-1); /* XXX: should not fail */ 688 689 return 0; 690} 691 692int 693in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 694 struct in6_addr *in6) 695{ 696 697 return (in6_nigroup0(ifp, name, namelen, in6, 0)); 698} 699 700int 701in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen, 702 struct in6_addr *in6) 703{ 704 705 return (in6_nigroup0(ifp, name, namelen, in6, 1)); 706} 707 708/* 709 * XXX multiple loopback interface needs more care. for instance, 710 * nodelocal address needs to be configured onto only one of them. 711 * XXX multiple link-local address case 712 * 713 * altifp - secondary EUI64 source 714 */ 715void 716in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 717{ 718 struct in6_ifaddr *ia; 719 struct in6_addr in6; 720 721 if (ifp->if_afdata[AF_INET6] == NULL) 722 return; 723 /* 724 * quirks based on interface type 725 */ 726 switch (ifp->if_type) { 727 case IFT_STF: 728 /* 729 * 6to4 interface is a very special kind of beast. 730 * no multicast, no linklocal. RFC2529 specifies how to make 731 * linklocals for 6to4 interface, but there's no use and 732 * it is rather harmful to have one. 733 */ 734 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 735 break; 736 default: 737 break; 738 } 739 740 /* 741 * usually, we require multicast capability to the interface 742 */ 743 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 744 nd6log((LOG_INFO, "in6_ifattach: " 745 "%s is not multicast capable, IPv6 not enabled\n", 746 if_name(ifp))); 747 return; 748 } 749 750 /* 751 * assign loopback address for loopback interface. 752 * XXX multiple loopback interface case. 753 */ 754 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 755 struct ifaddr *ifa; 756 757 in6 = in6addr_loopback; 758 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6); 759 if (ifa == NULL) { 760 if (in6_ifattach_loopback(ifp) != 0) 761 return; 762 } else 763 ifa_free(ifa); 764 } 765 766 /* 767 * assign a link-local address, if there's none. 768 */ 769 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 770 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 771 int error; 772 773 ia = in6ifa_ifpforlinklocal(ifp, 0); 774 if (ia == NULL) { 775 error = in6_ifattach_linklocal(ifp, altifp); 776#if 0 777 if (error) 778 log(LOG_NOTICE, "in6_ifattach_linklocal: " 779 "failed to add a link-local addr to %s\n", 780 if_name(ifp)); 781#endif 782 } else 783 ifa_free(&ia->ia_ifa); 784 } 785 786 /* update dynamically. */ 787 if (V_in6_maxmtu < ifp->if_mtu) 788 V_in6_maxmtu = ifp->if_mtu; 789} 790 791/* 792 * NOTE: in6_ifdetach() does not support loopback if at this moment. 793 * We don't need this function in bsdi, because interfaces are never removed 794 * from the ifnet list in bsdi. 795 */ 796void 797in6_ifdetach(struct ifnet *ifp) 798{ 799 struct in6_ifaddr *ia; 800 struct ifaddr *ifa, *next; 801 struct radix_node_head *rnh; 802 struct rtentry *rt; 803 struct sockaddr_in6 sin6; 804 struct in6_multi_mship *imm; 805 806 if (ifp->if_afdata[AF_INET6] == NULL) 807 return; 808 809 /* remove neighbor management table */ 810 nd6_purge(ifp); 811 812 /* nuke any of IPv6 addresses we have */ 813 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 814 if (ifa->ifa_addr->sa_family != AF_INET6) 815 continue; 816 in6_purgeaddr(ifa); 817 } 818 819 /* undo everything done by in6_ifattach(), just in case */ 820 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 821 if (ifa->ifa_addr->sa_family != AF_INET6 822 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 823 continue; 824 } 825 826 ia = (struct in6_ifaddr *)ifa; 827 828 /* 829 * leave from multicast groups we have joined for the interface 830 */ 831 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 832 LIST_REMOVE(imm, i6mm_chain); 833 in6_leavegroup(imm); 834 } 835 836 /* Remove link-local from the routing table. */ 837 if (ia->ia_flags & IFA_ROUTE) 838 (void)rtinit(&ia->ia_ifa, RTM_DELETE, ia->ia_flags); 839 840 /* remove from the linked list */ 841 IF_ADDR_WLOCK(ifp); 842 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 843 IF_ADDR_WUNLOCK(ifp); 844 ifa_free(ifa); /* if_addrhead */ 845 846 IN6_IFADDR_WLOCK(); 847 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 848 IN6_IFADDR_WUNLOCK(); 849 ifa_free(ifa); 850 } 851 852 in6_pcbpurgeif0(&V_udbinfo, ifp); 853 in6_pcbpurgeif0(&V_ulitecbinfo, ifp); 854 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 855 /* leave from all multicast groups joined */ 856 in6_purgemaddrs(ifp); 857 858 /* 859 * remove neighbor management table. we call it twice just to make 860 * sure we nuke everything. maybe we need just one call. 861 * XXX: since the first call did not release addresses, some prefixes 862 * might remain. We should call nd6_purge() again to release the 863 * prefixes after removing all addresses above. 864 * (Or can we just delay calling nd6_purge until at this point?) 865 */ 866 nd6_purge(ifp); 867 868 /* 869 * Remove route to link-local allnodes multicast (ff02::1). 870 * These only get automatically installed for the default FIB. 871 */ 872 bzero(&sin6, sizeof(sin6)); 873 sin6.sin6_len = sizeof(struct sockaddr_in6); 874 sin6.sin6_family = AF_INET6; 875 sin6.sin6_addr = in6addr_linklocal_allnodes; 876 if (in6_setscope(&sin6.sin6_addr, ifp, NULL)) 877 /* XXX: should not fail */ 878 return; 879 /* XXX grab lock first to avoid LOR */ 880 rnh = rt_tables_get_rnh(RT_DEFAULT_FIB, AF_INET6); 881 if (rnh != NULL) { 882 RADIX_NODE_HEAD_LOCK(rnh); 883 rt = in6_rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED, 884 RT_DEFAULT_FIB); 885 if (rt) { 886 if (rt->rt_ifp == ifp) 887 rtexpunge(rt); 888 RTFREE_LOCKED(rt); 889 } 890 RADIX_NODE_HEAD_UNLOCK(rnh); 891 } 892} 893 894int 895in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 896 const u_int8_t *baseid, int generate) 897{ 898 u_int8_t nullbuf[8]; 899 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 900 901 bzero(nullbuf, sizeof(nullbuf)); 902 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 903 /* we've never created a random ID. Create a new one. */ 904 generate = 1; 905 } 906 907 if (generate) { 908 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 909 910 /* generate_tmp_ifid will update seedn and buf */ 911 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 912 ndi->randomid); 913 } 914 bcopy(ndi->randomid, retbuf, 8); 915 916 return (0); 917} 918 919void 920in6_tmpaddrtimer(void *arg) 921{ 922 CURVNET_SET((struct vnet *) arg); 923 struct nd_ifinfo *ndi; 924 u_int8_t nullbuf[8]; 925 struct ifnet *ifp; 926 927 callout_reset(&V_in6_tmpaddrtimer_ch, 928 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 929 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 930 931 bzero(nullbuf, sizeof(nullbuf)); 932 TAILQ_FOREACH(ifp, &V_ifnet, if_list) { 933 if (ifp->if_afdata[AF_INET6] == NULL) 934 continue; 935 ndi = ND_IFINFO(ifp); 936 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 937 /* 938 * We've been generating a random ID on this interface. 939 * Create a new one. 940 */ 941 (void)generate_tmp_ifid(ndi->randomseed0, 942 ndi->randomseed1, ndi->randomid); 943 } 944 } 945 946 CURVNET_RESTORE(); 947} 948 949static void 950in6_purgemaddrs(struct ifnet *ifp) 951{ 952 LIST_HEAD(,in6_multi) purgeinms; 953 struct in6_multi *inm, *tinm; 954 struct ifmultiaddr *ifma; 955 956 LIST_INIT(&purgeinms); 957 IN6_MULTI_LOCK(); 958 959 /* 960 * Extract list of in6_multi associated with the detaching ifp 961 * which the PF_INET6 layer is about to release. 962 * We need to do this as IF_ADDR_LOCK() may be re-acquired 963 * by code further down. 964 */ 965 IF_ADDR_RLOCK(ifp); 966 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 967 if (ifma->ifma_addr->sa_family != AF_INET6 || 968 ifma->ifma_protospec == NULL) 969 continue; 970 inm = (struct in6_multi *)ifma->ifma_protospec; 971 LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry); 972 } 973 IF_ADDR_RUNLOCK(ifp); 974 975 LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) { 976 LIST_REMOVE(inm, in6m_entry); 977 in6m_release_locked(inm); 978 } 979 mld_ifdetach(ifp); 980 981 IN6_MULTI_UNLOCK(); 982} 983