1 /* $NetBSD: in6.c,v 1.149 2009/03/18 17:06:52 cegger Exp $ */ 2 /* $KAME: in6.c,v 1.198 2001/07/18 09:12:38 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1991, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)in.c 8.2 (Berkeley) 11/15/93 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: in6.c,v 1.149 2009/03/18 17:06:52 cegger Exp $"); 66 67 #include "opt_inet.h" 68 #include "opt_pfil_hooks.h" 69 #include "opt_compat_netbsd.h" 70 71 #include <sys/param.h> 72 #include <sys/ioctl.h> 73 #include <sys/errno.h> 74 #include <sys/malloc.h> 75 #include <sys/socket.h> 76 #include <sys/socketvar.h> 77 #include <sys/sockio.h> 78 #include <sys/systm.h> 79 #include <sys/proc.h> 80 #include <sys/time.h> 81 #include <sys/kernel.h> 82 #include <sys/syslog.h> 83 #include <sys/kauth.h> 84 85 #include <net/if.h> 86 #include <net/if_types.h> 87 #include <net/route.h> 88 #include <net/if_dl.h> 89 90 #include <netinet/in.h> 91 #include <netinet/in_var.h> 92 #include <net/if_ether.h> 93 94 #include <netinet/ip6.h> 95 #include <netinet6/ip6_var.h> 96 #include <netinet6/nd6.h> 97 #include <netinet6/mld6_var.h> 98 #include <netinet6/ip6_mroute.h> 99 #include <netinet6/in6_ifattach.h> 100 #include <netinet6/scope6_var.h> 101 102 #include <net/net_osdep.h> 103 104 #ifdef PFIL_HOOKS 105 #include <net/pfil.h> 106 #endif 107 #ifdef COMPAT_50 108 #include <compat/netinet6/in6_var.h> 109 #endif 110 111 MALLOC_DEFINE(M_IP6OPT, "ip6_options", "IPv6 options"); 112 113 /* enable backward compatibility code for obsoleted ioctls */ 114 #define COMPAT_IN6IFIOCTL 115 116 #ifdef IN6_DEBUG 117 #define IN6_DPRINTF(__fmt, ...) printf(__fmt, __VA_ARGS__) 118 #else 119 #define IN6_DPRINTF(__fmt, ...) do { } while (/*CONSTCOND*/0) 120 #endif /* IN6_DEBUG */ 121 122 /* 123 * Definitions of some constant IP6 addresses. 124 */ 125 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 126 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 127 const struct in6_addr in6addr_nodelocal_allnodes = 128 IN6ADDR_NODELOCAL_ALLNODES_INIT; 129 const struct in6_addr in6addr_linklocal_allnodes = 130 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 131 const struct in6_addr in6addr_linklocal_allrouters = 132 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 133 134 const struct in6_addr in6mask0 = IN6MASK0; 135 const struct in6_addr in6mask32 = IN6MASK32; 136 const struct in6_addr in6mask64 = IN6MASK64; 137 const struct in6_addr in6mask96 = IN6MASK96; 138 const struct in6_addr in6mask128 = IN6MASK128; 139 140 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6, 141 0, 0, IN6ADDR_ANY_INIT, 0}; 142 143 static int in6_lifaddr_ioctl(struct socket *, u_long, void *, 144 struct ifnet *, struct lwp *); 145 static int in6_ifinit(struct ifnet *, struct in6_ifaddr *, 146 const struct sockaddr_in6 *, int); 147 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 148 149 /* 150 * Subroutine for in6_ifaddloop() and in6_ifremloop(). 151 * This routine does actual work. 152 */ 153 static void 154 in6_ifloop_request(int cmd, struct ifaddr *ifa) 155 { 156 struct sockaddr_in6 lo_sa; 157 struct sockaddr_in6 all1_sa; 158 struct rtentry *nrt = NULL; 159 int e; 160 161 sockaddr_in6_init(&all1_sa, &in6mask128, 0, 0, 0); 162 sockaddr_in6_init(&lo_sa, &in6addr_loopback, 0, 0, 0); 163 164 /* 165 * We specify the address itself as the gateway, and set the 166 * RTF_LLINFO flag, so that the corresponding host route would have 167 * the flag, and thus applications that assume traditional behavior 168 * would be happy. Note that we assume the caller of the function 169 * (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest, 170 * which changes the outgoing interface to the loopback interface. 171 */ 172 e = rtrequest(cmd, ifa->ifa_addr, ifa->ifa_addr, 173 (struct sockaddr *)&all1_sa, RTF_UP|RTF_HOST|RTF_LLINFO, &nrt); 174 if (e != 0) { 175 log(LOG_ERR, "in6_ifloop_request: " 176 "%s operation failed for %s (errno=%d)\n", 177 cmd == RTM_ADD ? "ADD" : "DELETE", 178 ip6_sprintf(&((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr), 179 e); 180 } 181 182 /* 183 * Make sure rt_ifa be equal to IFA, the second argument of the 184 * function. 185 * We need this because when we refer to rt_ifa->ia6_flags in 186 * ip6_input, we assume that the rt_ifa points to the address instead 187 * of the loopback address. 188 */ 189 if (cmd == RTM_ADD && nrt && ifa != nrt->rt_ifa) 190 rt_replace_ifa(nrt, ifa); 191 192 /* 193 * Report the addition/removal of the address to the routing socket. 194 * XXX: since we called rtinit for a p2p interface with a destination, 195 * we end up reporting twice in such a case. Should we rather 196 * omit the second report? 197 */ 198 if (nrt) { 199 rt_newaddrmsg(cmd, ifa, e, nrt); 200 if (cmd == RTM_DELETE) { 201 if (nrt->rt_refcnt <= 0) { 202 /* XXX: we should free the entry ourselves. */ 203 nrt->rt_refcnt++; 204 rtfree(nrt); 205 } 206 } else { 207 /* the cmd must be RTM_ADD here */ 208 nrt->rt_refcnt--; 209 } 210 } 211 } 212 213 /* 214 * Add ownaddr as loopback rtentry. We previously add the route only if 215 * necessary (ex. on a p2p link). However, since we now manage addresses 216 * separately from prefixes, we should always add the route. We can't 217 * rely on the cloning mechanism from the corresponding interface route 218 * any more. 219 */ 220 void 221 in6_ifaddloop(struct ifaddr *ifa) 222 { 223 struct rtentry *rt; 224 225 /* If there is no loopback entry, allocate one. */ 226 rt = rtalloc1(ifa->ifa_addr, 0); 227 if (rt == NULL || (rt->rt_flags & RTF_HOST) == 0 || 228 (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) 229 in6_ifloop_request(RTM_ADD, ifa); 230 if (rt != NULL) 231 rt->rt_refcnt--; 232 } 233 234 /* 235 * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(), 236 * if it exists. 237 */ 238 void 239 in6_ifremloop(struct ifaddr *ifa) 240 { 241 struct in6_ifaddr *alt_ia = NULL, *ia; 242 struct rtentry *rt; 243 int ia_count = 0; 244 245 /* 246 * Some of BSD variants do not remove cloned routes 247 * from an interface direct route, when removing the direct route 248 * (see comments in net/net_osdep.h). Even for variants that do remove 249 * cloned routes, they could fail to remove the cloned routes when 250 * we handle multple addresses that share a common prefix. 251 * So, we should remove the route corresponding to the deleted address. 252 */ 253 254 /* 255 * Delete the entry only if exactly one ifaddr matches the 256 * address, ifa->ifa_addr. 257 * 258 * If more than one ifaddr matches, replace the ifaddr in 259 * the routing table, rt_ifa, with a different ifaddr than 260 * the one we are purging, ifa. It is important to do 261 * this, or else the routing table can accumulate dangling 262 * pointers rt->rt_ifa->ifa_ifp to destroyed interfaces, 263 * which will lead to crashes, later. (More than one ifaddr 264 * can match if we assign the same address to multiple---probably 265 * p2p---interfaces.) 266 * 267 * XXX An old comment at this place said, "we should avoid 268 * XXX such a configuration [i.e., interfaces with the same 269 * XXX addressed assigned --ed.] in IPv6...". I do not 270 * XXX agree, especially now that I have fixed the dangling 271 * XXX ifp-pointers bug. 272 */ 273 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 274 if (!IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) 275 continue; 276 if (ia->ia_ifp != ifa->ifa_ifp) 277 alt_ia = ia; 278 if (++ia_count > 1 && alt_ia != NULL) 279 break; 280 } 281 282 if (ia_count == 0) 283 return; 284 285 if ((rt = rtalloc1(ifa->ifa_addr, 0)) == NULL) 286 return; 287 rt->rt_refcnt--; 288 289 /* 290 * Before deleting, check if a corresponding loopbacked 291 * host route surely exists. With this check, we can avoid 292 * deleting an interface direct route whose destination is 293 * the same as the address being removed. This can happen 294 * when removing a subnet-router anycast address on an 295 * interface attached to a shared medium. 296 */ 297 if ((rt->rt_flags & RTF_HOST) == 0 || 298 (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) 299 return; 300 301 /* If we cannot replace the route's ifaddr with the equivalent 302 * ifaddr of another interface, I believe it is safest to 303 * delete the route. 304 */ 305 if (ia_count == 1 || alt_ia == NULL) 306 in6_ifloop_request(RTM_DELETE, ifa); 307 else 308 rt_replace_ifa(rt, &alt_ia->ia_ifa); 309 } 310 311 int 312 in6_mask2len(struct in6_addr *mask, u_char *lim0) 313 { 314 int x = 0, y; 315 u_char *lim = lim0, *p; 316 317 /* ignore the scope_id part */ 318 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 319 lim = (u_char *)mask + sizeof(*mask); 320 for (p = (u_char *)mask; p < lim; x++, p++) { 321 if (*p != 0xff) 322 break; 323 } 324 y = 0; 325 if (p < lim) { 326 for (y = 0; y < NBBY; y++) { 327 if ((*p & (0x80 >> y)) == 0) 328 break; 329 } 330 } 331 332 /* 333 * when the limit pointer is given, do a stricter check on the 334 * remaining bits. 335 */ 336 if (p < lim) { 337 if (y != 0 && (*p & (0x00ff >> y)) != 0) 338 return -1; 339 for (p = p + 1; p < lim; p++) 340 if (*p != 0) 341 return -1; 342 } 343 344 return x * NBBY + y; 345 } 346 347 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 348 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 349 350 static int 351 in6_control1(struct socket *so, u_long cmd, void *data, struct ifnet *ifp, 352 struct lwp *l, int privileged) 353 { 354 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 355 struct in6_ifaddr *ia = NULL; 356 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 357 struct sockaddr_in6 *sa6; 358 int error; 359 switch (cmd) { 360 /* 361 * XXX: Fix me, once we fix SIOCSIFADDR, SIOCIFDSTADDR, etc. 362 */ 363 case SIOCSIFADDR: 364 case SIOCSIFDSTADDR: 365 #ifdef SIOCSIFCONF_X25 366 case SIOCSIFCONF_X25: 367 #endif 368 return EOPNOTSUPP; 369 case SIOCGETSGCNT_IN6: 370 case SIOCGETMIFCNT_IN6: 371 return mrt6_ioctl(cmd, data); 372 } 373 374 if (ifp == NULL) 375 return EOPNOTSUPP; 376 377 switch (cmd) { 378 case SIOCSNDFLUSH_IN6: 379 case SIOCSPFXFLUSH_IN6: 380 case SIOCSRTRFLUSH_IN6: 381 case SIOCSDEFIFACE_IN6: 382 case SIOCSIFINFO_FLAGS: 383 case SIOCSIFINFO_IN6: 384 if (!privileged) 385 return EPERM; 386 /* FALLTHROUGH */ 387 case OSIOCGIFINFO_IN6: 388 case SIOCGIFINFO_IN6: 389 case SIOCGDRLST_IN6: 390 case SIOCGPRLST_IN6: 391 case SIOCGNBRINFO_IN6: 392 case SIOCGDEFIFACE_IN6: 393 return nd6_ioctl(cmd, data, ifp); 394 } 395 396 switch (cmd) { 397 case SIOCSIFPREFIX_IN6: 398 case SIOCDIFPREFIX_IN6: 399 case SIOCAIFPREFIX_IN6: 400 case SIOCCIFPREFIX_IN6: 401 case SIOCSGIFPREFIX_IN6: 402 case SIOCGIFPREFIX_IN6: 403 log(LOG_NOTICE, 404 "prefix ioctls are now invalidated. " 405 "please use ifconfig.\n"); 406 return EOPNOTSUPP; 407 } 408 409 switch (cmd) { 410 case SIOCALIFADDR: 411 case SIOCDLIFADDR: 412 if (!privileged) 413 return EPERM; 414 /* FALLTHROUGH */ 415 case SIOCGLIFADDR: 416 return in6_lifaddr_ioctl(so, cmd, data, ifp, l); 417 } 418 419 /* 420 * Find address for this interface, if it exists. 421 * 422 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 423 * only, and used the first interface address as the target of other 424 * operations (without checking ifra_addr). This was because netinet 425 * code/API assumed at most 1 interface address per interface. 426 * Since IPv6 allows a node to assign multiple addresses 427 * on a single interface, we almost always look and check the 428 * presence of ifra_addr, and reject invalid ones here. 429 * It also decreases duplicated code among SIOC*_IN6 operations. 430 */ 431 switch (cmd) { 432 case SIOCAIFADDR_IN6: 433 #ifdef OSIOCAIFADDR_IN6 434 case OSIOCAIFADDR_IN6: 435 #endif 436 #ifdef OSIOCSIFPHYADDR_IN6 437 case OSIOCSIFPHYADDR_IN6: 438 #endif 439 case SIOCSIFPHYADDR_IN6: 440 sa6 = &ifra->ifra_addr; 441 break; 442 case SIOCSIFADDR_IN6: 443 case SIOCGIFADDR_IN6: 444 case SIOCSIFDSTADDR_IN6: 445 case SIOCSIFNETMASK_IN6: 446 case SIOCGIFDSTADDR_IN6: 447 case SIOCGIFNETMASK_IN6: 448 case SIOCDIFADDR_IN6: 449 case SIOCGIFPSRCADDR_IN6: 450 case SIOCGIFPDSTADDR_IN6: 451 case SIOCGIFAFLAG_IN6: 452 case SIOCSNDFLUSH_IN6: 453 case SIOCSPFXFLUSH_IN6: 454 case SIOCSRTRFLUSH_IN6: 455 case SIOCGIFALIFETIME_IN6: 456 #ifdef OSIOCGIFALIFETIME_IN6 457 case OSIOCGIFALIFETIME_IN6: 458 #endif 459 case SIOCGIFSTAT_IN6: 460 case SIOCGIFSTAT_ICMP6: 461 sa6 = &ifr->ifr_addr; 462 break; 463 default: 464 sa6 = NULL; 465 break; 466 } 467 if (sa6 && sa6->sin6_family == AF_INET6) { 468 if (sa6->sin6_scope_id != 0) 469 error = sa6_embedscope(sa6, 0); 470 else 471 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 472 if (error != 0) 473 return error; 474 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 475 } else 476 ia = NULL; 477 478 switch (cmd) { 479 case SIOCSIFADDR_IN6: 480 case SIOCSIFDSTADDR_IN6: 481 case SIOCSIFNETMASK_IN6: 482 /* 483 * Since IPv6 allows a node to assign multiple addresses 484 * on a single interface, SIOCSIFxxx ioctls are deprecated. 485 */ 486 return EINVAL; 487 488 case SIOCDIFADDR_IN6: 489 /* 490 * for IPv4, we look for existing in_ifaddr here to allow 491 * "ifconfig if0 delete" to remove the first IPv4 address on 492 * the interface. For IPv6, as the spec allows multiple 493 * interface address from the day one, we consider "remove the 494 * first one" semantics to be not preferable. 495 */ 496 if (ia == NULL) 497 return EADDRNOTAVAIL; 498 /* FALLTHROUGH */ 499 #ifdef OSIOCAIFADDR_IN6 500 case OSIOCAIFADDR_IN6: 501 #endif 502 case SIOCAIFADDR_IN6: 503 /* 504 * We always require users to specify a valid IPv6 address for 505 * the corresponding operation. 506 */ 507 if (ifra->ifra_addr.sin6_family != AF_INET6 || 508 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) 509 return EAFNOSUPPORT; 510 if (!privileged) 511 return EPERM; 512 513 break; 514 515 case SIOCGIFADDR_IN6: 516 /* This interface is basically deprecated. use SIOCGIFCONF. */ 517 /* FALLTHROUGH */ 518 case SIOCGIFAFLAG_IN6: 519 case SIOCGIFNETMASK_IN6: 520 case SIOCGIFDSTADDR_IN6: 521 case SIOCGIFALIFETIME_IN6: 522 #ifdef OSIOCGIFALIFETIME_IN6 523 case OSIOCGIFALIFETIME_IN6: 524 #endif 525 /* must think again about its semantics */ 526 if (ia == NULL) 527 return EADDRNOTAVAIL; 528 break; 529 } 530 531 switch (cmd) { 532 533 case SIOCGIFADDR_IN6: 534 ifr->ifr_addr = ia->ia_addr; 535 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 536 return error; 537 break; 538 539 case SIOCGIFDSTADDR_IN6: 540 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 541 return EINVAL; 542 /* 543 * XXX: should we check if ifa_dstaddr is NULL and return 544 * an error? 545 */ 546 ifr->ifr_dstaddr = ia->ia_dstaddr; 547 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 548 return error; 549 break; 550 551 case SIOCGIFNETMASK_IN6: 552 ifr->ifr_addr = ia->ia_prefixmask; 553 break; 554 555 case SIOCGIFAFLAG_IN6: 556 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 557 break; 558 559 case SIOCGIFSTAT_IN6: 560 if (ifp == NULL) 561 return EINVAL; 562 memset(&ifr->ifr_ifru.ifru_stat, 0, 563 sizeof(ifr->ifr_ifru.ifru_stat)); 564 ifr->ifr_ifru.ifru_stat = 565 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat; 566 break; 567 568 case SIOCGIFSTAT_ICMP6: 569 if (ifp == NULL) 570 return EINVAL; 571 memset(&ifr->ifr_ifru.ifru_icmp6stat, 0, 572 sizeof(ifr->ifr_ifru.ifru_icmp6stat)); 573 ifr->ifr_ifru.ifru_icmp6stat = 574 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat; 575 break; 576 577 #ifdef OSIOCGIFALIFETIME_IN6 578 case OSIOCGIFALIFETIME_IN6: 579 #endif 580 case SIOCGIFALIFETIME_IN6: 581 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 582 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 583 time_t maxexpire; 584 struct in6_addrlifetime *retlt = 585 &ifr->ifr_ifru.ifru_lifetime; 586 587 /* 588 * XXX: adjust expiration time assuming time_t is 589 * signed. 590 */ 591 maxexpire = ((time_t)~0) & 592 ~((time_t)1 << ((sizeof(maxexpire) * NBBY) - 1)); 593 if (ia->ia6_lifetime.ia6t_vltime < 594 maxexpire - ia->ia6_updatetime) { 595 retlt->ia6t_expire = ia->ia6_updatetime + 596 ia->ia6_lifetime.ia6t_vltime; 597 } else 598 retlt->ia6t_expire = maxexpire; 599 } 600 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 601 time_t maxexpire; 602 struct in6_addrlifetime *retlt = 603 &ifr->ifr_ifru.ifru_lifetime; 604 605 /* 606 * XXX: adjust expiration time assuming time_t is 607 * signed. 608 */ 609 maxexpire = ((time_t)~0) & 610 ~((time_t)1 << ((sizeof(maxexpire) * NBBY) - 1)); 611 if (ia->ia6_lifetime.ia6t_pltime < 612 maxexpire - ia->ia6_updatetime) { 613 retlt->ia6t_preferred = ia->ia6_updatetime + 614 ia->ia6_lifetime.ia6t_pltime; 615 } else 616 retlt->ia6t_preferred = maxexpire; 617 } 618 #ifdef OSIOCFIFALIFETIME_IN6 619 if (cmd == OSIOCFIFALIFETIME_IN6) 620 in6_addrlifetime_to_in6_addrlifetime50( 621 &ifr->ifru.ifru_lifetime); 622 #endif 623 break; 624 625 #ifdef OSIOCAIFADDR_IN6 626 case OSIOCAIFADDR_IN6: 627 in6_aliasreq50_to_in6_aliasreq(ifra); 628 /*FALLTHROUGH*/ 629 #endif 630 case SIOCAIFADDR_IN6: 631 { 632 int i; 633 struct nd_prefixctl pr0; 634 struct nd_prefix *pr; 635 636 /* reject read-only flags */ 637 if ((ifra->ifra_flags & IN6_IFF_DUPLICATED) != 0 || 638 (ifra->ifra_flags & IN6_IFF_DETACHED) != 0 || 639 (ifra->ifra_flags & IN6_IFF_NODAD) != 0 || 640 (ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0) { 641 return EINVAL; 642 } 643 /* 644 * first, make or update the interface address structure, 645 * and link it to the list. 646 */ 647 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 648 return error; 649 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 650 == NULL) { 651 /* 652 * this can happen when the user specify the 0 valid 653 * lifetime. 654 */ 655 break; 656 } 657 658 /* 659 * then, make the prefix on-link on the interface. 660 * XXX: we'd rather create the prefix before the address, but 661 * we need at least one address to install the corresponding 662 * interface route, so we configure the address first. 663 */ 664 665 /* 666 * convert mask to prefix length (prefixmask has already 667 * been validated in in6_update_ifa(). 668 */ 669 memset(&pr0, 0, sizeof(pr0)); 670 pr0.ndpr_ifp = ifp; 671 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 672 NULL); 673 if (pr0.ndpr_plen == 128) { 674 break; /* we don't need to install a host route. */ 675 } 676 pr0.ndpr_prefix = ifra->ifra_addr; 677 /* apply the mask for safety. */ 678 for (i = 0; i < 4; i++) { 679 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 680 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i]; 681 } 682 /* 683 * XXX: since we don't have an API to set prefix (not address) 684 * lifetimes, we just use the same lifetimes as addresses. 685 * The (temporarily) installed lifetimes can be overridden by 686 * later advertised RAs (when accept_rtadv is non 0), which is 687 * an intended behavior. 688 */ 689 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 690 pr0.ndpr_raf_auto = 691 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 692 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 693 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 694 695 /* add the prefix if not yet. */ 696 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 697 /* 698 * nd6_prelist_add will install the corresponding 699 * interface route. 700 */ 701 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) 702 return error; 703 if (pr == NULL) { 704 log(LOG_ERR, "nd6_prelist_add succeeded but " 705 "no prefix\n"); 706 return EINVAL; /* XXX panic here? */ 707 } 708 } 709 710 /* relate the address to the prefix */ 711 if (ia->ia6_ndpr == NULL) { 712 ia->ia6_ndpr = pr; 713 pr->ndpr_refcnt++; 714 715 /* 716 * If this is the first autoconf address from the 717 * prefix, create a temporary address as well 718 * (when required). 719 */ 720 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 721 ip6_use_tempaddr && pr->ndpr_refcnt == 1) { 722 int e; 723 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 724 log(LOG_NOTICE, "in6_control: failed " 725 "to create a temporary address, " 726 "errno=%d\n", e); 727 } 728 } 729 } 730 731 /* 732 * this might affect the status of autoconfigured addresses, 733 * that is, this address might make other addresses detached. 734 */ 735 pfxlist_onlink_check(); 736 737 #ifdef PFIL_HOOKS 738 (void)pfil_run_hooks(&if_pfil, (struct mbuf **)SIOCAIFADDR_IN6, 739 ifp, PFIL_IFADDR); 740 #endif 741 742 break; 743 } 744 745 case SIOCDIFADDR_IN6: 746 { 747 struct nd_prefix *pr; 748 749 /* 750 * If the address being deleted is the only one that owns 751 * the corresponding prefix, expire the prefix as well. 752 * XXX: theoretically, we don't have to worry about such 753 * relationship, since we separate the address management 754 * and the prefix management. We do this, however, to provide 755 * as much backward compatibility as possible in terms of 756 * the ioctl operation. 757 * Note that in6_purgeaddr() will decrement ndpr_refcnt. 758 */ 759 pr = ia->ia6_ndpr; 760 in6_purgeaddr(&ia->ia_ifa); 761 if (pr && pr->ndpr_refcnt == 0) 762 prelist_remove(pr); 763 #ifdef PFIL_HOOKS 764 (void)pfil_run_hooks(&if_pfil, (struct mbuf **)SIOCDIFADDR_IN6, 765 ifp, PFIL_IFADDR); 766 #endif 767 break; 768 } 769 770 default: 771 return ENOTTY; 772 } 773 774 return 0; 775 } 776 777 int 778 in6_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp, 779 struct lwp *l) 780 { 781 int error, privileged, s; 782 783 privileged = 0; 784 if (l && !kauth_authorize_generic(l->l_cred, 785 KAUTH_GENERIC_ISSUSER, NULL)) 786 privileged++; 787 788 s = splnet(); 789 error = in6_control1(so , cmd, data, ifp, l, privileged); 790 splx(s); 791 return error; 792 } 793 794 /* 795 * Update parameters of an IPv6 interface address. 796 * If necessary, a new entry is created and linked into address chains. 797 * This function is separated from in6_control(). 798 * XXX: should this be performed under splnet()? 799 */ 800 static int 801 in6_update_ifa1(struct ifnet *ifp, struct in6_aliasreq *ifra, 802 struct in6_ifaddr *ia, int flags) 803 { 804 int error = 0, hostIsNew = 0, plen = -1; 805 struct in6_ifaddr *oia; 806 struct sockaddr_in6 dst6; 807 struct in6_addrlifetime *lt; 808 struct in6_multi_mship *imm; 809 struct in6_multi *in6m_sol; 810 struct rtentry *rt; 811 int dad_delay; 812 813 in6m_sol = NULL; 814 815 /* Validate parameters */ 816 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 817 return EINVAL; 818 819 /* 820 * The destination address for a p2p link must have a family 821 * of AF_UNSPEC or AF_INET6. 822 */ 823 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 824 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 825 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 826 return EAFNOSUPPORT; 827 /* 828 * validate ifra_prefixmask. don't check sin6_family, netmask 829 * does not carry fields other than sin6_len. 830 */ 831 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 832 return EINVAL; 833 /* 834 * Because the IPv6 address architecture is classless, we require 835 * users to specify a (non 0) prefix length (mask) for a new address. 836 * We also require the prefix (when specified) mask is valid, and thus 837 * reject a non-consecutive mask. 838 */ 839 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 840 return EINVAL; 841 if (ifra->ifra_prefixmask.sin6_len != 0) { 842 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 843 (u_char *)&ifra->ifra_prefixmask + 844 ifra->ifra_prefixmask.sin6_len); 845 if (plen <= 0) 846 return EINVAL; 847 } else { 848 /* 849 * In this case, ia must not be NULL. We just use its prefix 850 * length. 851 */ 852 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 853 } 854 /* 855 * If the destination address on a p2p interface is specified, 856 * and the address is a scoped one, validate/set the scope 857 * zone identifier. 858 */ 859 dst6 = ifra->ifra_dstaddr; 860 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 861 (dst6.sin6_family == AF_INET6)) { 862 struct in6_addr in6_tmp; 863 u_int32_t zoneid; 864 865 in6_tmp = dst6.sin6_addr; 866 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 867 return EINVAL; /* XXX: should be impossible */ 868 869 if (dst6.sin6_scope_id != 0) { 870 if (dst6.sin6_scope_id != zoneid) 871 return EINVAL; 872 } else /* user omit to specify the ID. */ 873 dst6.sin6_scope_id = zoneid; 874 875 /* convert into the internal form */ 876 if (sa6_embedscope(&dst6, 0)) 877 return EINVAL; /* XXX: should be impossible */ 878 } 879 /* 880 * The destination address can be specified only for a p2p or a 881 * loopback interface. If specified, the corresponding prefix length 882 * must be 128. 883 */ 884 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 885 #ifdef FORCE_P2PPLEN 886 int i; 887 #endif 888 889 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 890 /* XXX: noisy message */ 891 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 892 "be specified for a p2p or a loopback IF only\n")); 893 return EINVAL; 894 } 895 if (plen != 128) { 896 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 897 "be 128 when dstaddr is specified\n")); 898 #ifdef FORCE_P2PPLEN 899 /* 900 * To be compatible with old configurations, 901 * such as ifconfig gif0 inet6 2001::1 2001::2 902 * prefixlen 126, we override the specified 903 * prefixmask as if the prefix length was 128. 904 */ 905 ifra->ifra_prefixmask.sin6_len = 906 sizeof(struct sockaddr_in6); 907 for (i = 0; i < 4; i++) 908 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i] = 909 0xffffffff; 910 plen = 128; 911 #else 912 return EINVAL; 913 #endif 914 } 915 } 916 /* lifetime consistency check */ 917 lt = &ifra->ifra_lifetime; 918 if (lt->ia6t_pltime > lt->ia6t_vltime) 919 return EINVAL; 920 if (lt->ia6t_vltime == 0) { 921 /* 922 * the following log might be noisy, but this is a typical 923 * configuration mistake or a tool's bug. 924 */ 925 nd6log((LOG_INFO, 926 "in6_update_ifa: valid lifetime is 0 for %s\n", 927 ip6_sprintf(&ifra->ifra_addr.sin6_addr))); 928 929 if (ia == NULL) 930 return 0; /* there's nothing to do */ 931 } 932 933 /* 934 * If this is a new address, allocate a new ifaddr and link it 935 * into chains. 936 */ 937 if (ia == NULL) { 938 hostIsNew = 1; 939 /* 940 * When in6_update_ifa() is called in a process of a received 941 * RA, it is called under an interrupt context. So, we should 942 * call malloc with M_NOWAIT. 943 */ 944 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR, 945 M_NOWAIT); 946 if (ia == NULL) 947 return ENOBUFS; 948 memset((void *)ia, 0, sizeof(*ia)); 949 LIST_INIT(&ia->ia6_memberships); 950 /* Initialize the address and masks, and put time stamp */ 951 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 952 ia->ia_addr.sin6_family = AF_INET6; 953 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 954 ia->ia6_createtime = time_second; 955 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 956 /* 957 * XXX: some functions expect that ifa_dstaddr is not 958 * NULL for p2p interfaces. 959 */ 960 ia->ia_ifa.ifa_dstaddr = 961 (struct sockaddr *)&ia->ia_dstaddr; 962 } else { 963 ia->ia_ifa.ifa_dstaddr = NULL; 964 } 965 ia->ia_ifa.ifa_netmask = 966 (struct sockaddr *)&ia->ia_prefixmask; 967 968 ia->ia_ifp = ifp; 969 if ((oia = in6_ifaddr) != NULL) { 970 for ( ; oia->ia_next; oia = oia->ia_next) 971 continue; 972 oia->ia_next = ia; 973 } else 974 in6_ifaddr = ia; 975 /* gain a refcnt for the link from in6_ifaddr */ 976 IFAREF(&ia->ia_ifa); 977 978 ifa_insert(ifp, &ia->ia_ifa); 979 } 980 981 /* update timestamp */ 982 ia->ia6_updatetime = time_second; 983 984 /* set prefix mask */ 985 if (ifra->ifra_prefixmask.sin6_len) { 986 /* 987 * We prohibit changing the prefix length of an existing 988 * address, because 989 * + such an operation should be rare in IPv6, and 990 * + the operation would confuse prefix management. 991 */ 992 if (ia->ia_prefixmask.sin6_len && 993 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 994 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an" 995 " existing (%s) address should not be changed\n", 996 ip6_sprintf(&ia->ia_addr.sin6_addr))); 997 error = EINVAL; 998 goto unlink; 999 } 1000 ia->ia_prefixmask = ifra->ifra_prefixmask; 1001 } 1002 1003 /* 1004 * If a new destination address is specified, scrub the old one and 1005 * install the new destination. Note that the interface must be 1006 * p2p or loopback (see the check above.) 1007 */ 1008 if (dst6.sin6_family == AF_INET6 && 1009 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1010 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1011 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0) { 1012 nd6log((LOG_ERR, "in6_update_ifa: failed to remove " 1013 "a route to the old destination: %s\n", 1014 ip6_sprintf(&ia->ia_addr.sin6_addr))); 1015 /* proceed anyway... */ 1016 } else 1017 ia->ia_flags &= ~IFA_ROUTE; 1018 ia->ia_dstaddr = dst6; 1019 } 1020 1021 /* 1022 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1023 * to see if the address is deprecated or invalidated, but initialize 1024 * these members for applications. 1025 */ 1026 ia->ia6_lifetime = ifra->ifra_lifetime; 1027 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1028 ia->ia6_lifetime.ia6t_expire = 1029 time_second + ia->ia6_lifetime.ia6t_vltime; 1030 } else 1031 ia->ia6_lifetime.ia6t_expire = 0; 1032 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1033 ia->ia6_lifetime.ia6t_preferred = 1034 time_second + ia->ia6_lifetime.ia6t_pltime; 1035 } else 1036 ia->ia6_lifetime.ia6t_preferred = 0; 1037 1038 /* reset the interface and routing table appropriately. */ 1039 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 1040 goto unlink; 1041 1042 /* 1043 * configure address flags. 1044 */ 1045 ia->ia6_flags = ifra->ifra_flags; 1046 /* 1047 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1048 * userland, make it deprecated. 1049 */ 1050 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1051 ia->ia6_lifetime.ia6t_pltime = 0; 1052 ia->ia6_lifetime.ia6t_preferred = time_second; 1053 } 1054 1055 /* 1056 * Make the address tentative before joining multicast addresses, 1057 * so that corresponding MLD responses would not have a tentative 1058 * source address. 1059 */ 1060 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1061 if (hostIsNew && in6if_do_dad(ifp)) 1062 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1063 1064 /* 1065 * We are done if we have simply modified an existing address. 1066 */ 1067 if (!hostIsNew) 1068 return error; 1069 1070 /* 1071 * Beyond this point, we should call in6_purgeaddr upon an error, 1072 * not just go to unlink. 1073 */ 1074 1075 /* join necessary multicast groups */ 1076 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1077 struct sockaddr_in6 mltaddr, mltmask; 1078 struct in6_addr llsol; 1079 1080 /* join solicited multicast addr for new host id */ 1081 memset(&llsol, 0, sizeof(struct in6_addr)); 1082 llsol.s6_addr16[0] = htons(0xff02); 1083 llsol.s6_addr32[1] = 0; 1084 llsol.s6_addr32[2] = htonl(1); 1085 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 1086 llsol.s6_addr8[12] = 0xff; 1087 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) { 1088 /* XXX: should not happen */ 1089 log(LOG_ERR, "in6_update_ifa: " 1090 "in6_setscope failed\n"); 1091 goto cleanup; 1092 } 1093 dad_delay = 0; 1094 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1095 /* 1096 * We need a random delay for DAD on the address 1097 * being configured. It also means delaying 1098 * transmission of the corresponding MLD report to 1099 * avoid report collision. 1100 * [draft-ietf-ipv6-rfc2462bis-02.txt] 1101 */ 1102 dad_delay = arc4random() % 1103 (MAX_RTR_SOLICITATION_DELAY * hz); 1104 } 1105 1106 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */ 1107 /* join solicited multicast addr for new host id */ 1108 imm = in6_joingroup(ifp, &llsol, &error, dad_delay); 1109 if (!imm) { 1110 nd6log((LOG_ERR, 1111 "in6_update_ifa: addmulti " 1112 "failed for %s on %s (errno=%d)\n", 1113 ip6_sprintf(&llsol), if_name(ifp), error)); 1114 goto cleanup; 1115 } 1116 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1117 in6m_sol = imm->i6mm_maddr; 1118 1119 sockaddr_in6_init(&mltmask, &in6mask32, 0, 0, 0); 1120 1121 /* 1122 * join link-local all-nodes address 1123 */ 1124 sockaddr_in6_init(&mltaddr, &in6addr_linklocal_allnodes, 1125 0, 0, 0); 1126 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1127 goto cleanup; /* XXX: should not fail */ 1128 1129 /* 1130 * XXX: do we really need this automatic routes? 1131 * We should probably reconsider this stuff. Most applications 1132 * actually do not need the routes, since they usually specify 1133 * the outgoing interface. 1134 */ 1135 rt = rtalloc1((struct sockaddr *)&mltaddr, 0); 1136 if (rt) { 1137 if (memcmp(&mltaddr.sin6_addr, 1138 &satocsin6(rt_getkey(rt))->sin6_addr, 1139 MLTMASK_LEN)) { 1140 RTFREE(rt); 1141 rt = NULL; 1142 } else if (rt->rt_ifp != ifp) { 1143 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 1144 "network %04x:%04x::/32 = %04x:%04x::/32\n", 1145 __func__, rt->rt_ifp, ifp, ifp->if_xname, 1146 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 1147 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 1148 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 1149 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 1150 rt_replace_ifa(rt, &ia->ia_ifa); 1151 rt->rt_ifp = ifp; 1152 } 1153 } 1154 if (!rt) { 1155 struct rt_addrinfo info; 1156 1157 memset(&info, 0, sizeof(info)); 1158 info.rti_info[RTAX_DST] = (struct sockaddr *)&mltaddr; 1159 info.rti_info[RTAX_GATEWAY] = 1160 (struct sockaddr *)&ia->ia_addr; 1161 info.rti_info[RTAX_NETMASK] = 1162 (struct sockaddr *)&mltmask; 1163 info.rti_info[RTAX_IFA] = 1164 (struct sockaddr *)&ia->ia_addr; 1165 /* XXX: we need RTF_CLONING to fake nd6_rtrequest */ 1166 info.rti_flags = RTF_UP | RTF_CLONING; 1167 error = rtrequest1(RTM_ADD, &info, NULL); 1168 if (error) 1169 goto cleanup; 1170 } else { 1171 RTFREE(rt); 1172 } 1173 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1174 if (!imm) { 1175 nd6log((LOG_WARNING, 1176 "in6_update_ifa: addmulti failed for " 1177 "%s on %s (errno=%d)\n", 1178 ip6_sprintf(&mltaddr.sin6_addr), 1179 if_name(ifp), error)); 1180 goto cleanup; 1181 } 1182 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1183 1184 /* 1185 * join node information group address 1186 */ 1187 dad_delay = 0; 1188 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1189 /* 1190 * The spec doesn't say anything about delay for this 1191 * group, but the same logic should apply. 1192 */ 1193 dad_delay = arc4random() % 1194 (MAX_RTR_SOLICITATION_DELAY * hz); 1195 } 1196 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr) != 0) 1197 ; 1198 else if ((imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 1199 dad_delay)) == NULL) { /* XXX jinmei */ 1200 nd6log((LOG_WARNING, "in6_update_ifa: " 1201 "addmulti failed for %s on %s (errno=%d)\n", 1202 ip6_sprintf(&mltaddr.sin6_addr), 1203 if_name(ifp), error)); 1204 /* XXX not very fatal, go on... */ 1205 } else { 1206 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1207 } 1208 1209 1210 /* 1211 * join interface-local all-nodes address. 1212 * (ff01::1%ifN, and ff01::%ifN/32) 1213 */ 1214 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1215 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1216 goto cleanup; /* XXX: should not fail */ 1217 1218 /* XXX: again, do we really need the route? */ 1219 rt = rtalloc1((struct sockaddr *)&mltaddr, 0); 1220 if (rt) { 1221 /* 32bit came from "mltmask" */ 1222 if (memcmp(&mltaddr.sin6_addr, 1223 &satocsin6(rt_getkey(rt))->sin6_addr, 1224 32 / NBBY)) { 1225 RTFREE(rt); 1226 rt = NULL; 1227 } else if (rt->rt_ifp != ifp) { 1228 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 1229 "network %04x:%04x::/32 = %04x:%04x::/32\n", 1230 __func__, rt->rt_ifp, ifp, ifp->if_xname, 1231 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 1232 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 1233 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 1234 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 1235 rt_replace_ifa(rt, &ia->ia_ifa); 1236 rt->rt_ifp = ifp; 1237 } 1238 } 1239 if (!rt) { 1240 struct rt_addrinfo info; 1241 1242 memset(&info, 0, sizeof(info)); 1243 info.rti_info[RTAX_DST] = (struct sockaddr *)&mltaddr; 1244 info.rti_info[RTAX_GATEWAY] = 1245 (struct sockaddr *)&ia->ia_addr; 1246 info.rti_info[RTAX_NETMASK] = 1247 (struct sockaddr *)&mltmask; 1248 info.rti_info[RTAX_IFA] = 1249 (struct sockaddr *)&ia->ia_addr; 1250 info.rti_flags = RTF_UP | RTF_CLONING; 1251 error = rtrequest1(RTM_ADD, &info, NULL); 1252 if (error) 1253 goto cleanup; 1254 #undef MLTMASK_LEN 1255 } else { 1256 RTFREE(rt); 1257 } 1258 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1259 if (!imm) { 1260 nd6log((LOG_WARNING, "in6_update_ifa: " 1261 "addmulti failed for %s on %s (errno=%d)\n", 1262 ip6_sprintf(&mltaddr.sin6_addr), 1263 if_name(ifp), error)); 1264 goto cleanup; 1265 } else { 1266 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1267 } 1268 } 1269 1270 /* 1271 * Perform DAD, if needed. 1272 * XXX It may be of use, if we can administratively 1273 * disable DAD. 1274 */ 1275 if (hostIsNew && in6if_do_dad(ifp) && 1276 ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && 1277 (ia->ia6_flags & IN6_IFF_TENTATIVE)) 1278 { 1279 int mindelay, maxdelay; 1280 1281 dad_delay = 0; 1282 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1283 /* 1284 * We need to impose a delay before sending an NS 1285 * for DAD. Check if we also needed a delay for the 1286 * corresponding MLD message. If we did, the delay 1287 * should be larger than the MLD delay (this could be 1288 * relaxed a bit, but this simple logic is at least 1289 * safe). 1290 */ 1291 mindelay = 0; 1292 if (in6m_sol != NULL && 1293 in6m_sol->in6m_state == MLD_REPORTPENDING) { 1294 mindelay = in6m_sol->in6m_timer; 1295 } 1296 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1297 if (maxdelay - mindelay == 0) 1298 dad_delay = 0; 1299 else { 1300 dad_delay = 1301 (arc4random() % (maxdelay - mindelay)) + 1302 mindelay; 1303 } 1304 } 1305 nd6_dad_start(&ia->ia_ifa, dad_delay); 1306 } 1307 1308 return error; 1309 1310 unlink: 1311 /* 1312 * XXX: if a change of an existing address failed, keep the entry 1313 * anyway. 1314 */ 1315 if (hostIsNew) 1316 in6_unlink_ifa(ia, ifp); 1317 return error; 1318 1319 cleanup: 1320 in6_purgeaddr(&ia->ia_ifa); 1321 return error; 1322 } 1323 1324 int 1325 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1326 struct in6_ifaddr *ia, int flags) 1327 { 1328 int rc, s; 1329 1330 s = splnet(); 1331 rc = in6_update_ifa1(ifp, ifra, ia, flags); 1332 splx(s); 1333 return rc; 1334 } 1335 1336 void 1337 in6_purgeaddr(struct ifaddr *ifa) 1338 { 1339 struct ifnet *ifp = ifa->ifa_ifp; 1340 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1341 struct in6_multi_mship *imm; 1342 1343 /* stop DAD processing */ 1344 nd6_dad_stop(ifa); 1345 1346 /* 1347 * delete route to the destination of the address being purged. 1348 * The interface must be p2p or loopback in this case. 1349 */ 1350 if ((ia->ia_flags & IFA_ROUTE) != 0 && ia->ia_dstaddr.sin6_len != 0) { 1351 int e; 1352 1353 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 1354 != 0) { 1355 log(LOG_ERR, "in6_purgeaddr: failed to remove " 1356 "a route to the p2p destination: %s on %s, " 1357 "errno=%d\n", 1358 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp), 1359 e); 1360 /* proceed anyway... */ 1361 } else 1362 ia->ia_flags &= ~IFA_ROUTE; 1363 } 1364 1365 /* Remove ownaddr's loopback rtentry, if it exists. */ 1366 in6_ifremloop(&(ia->ia_ifa)); 1367 1368 /* 1369 * leave from multicast groups we have joined for the interface 1370 */ 1371 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1372 LIST_REMOVE(imm, i6mm_chain); 1373 in6_leavegroup(imm); 1374 } 1375 1376 in6_unlink_ifa(ia, ifp); 1377 } 1378 1379 static void 1380 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1381 { 1382 struct in6_ifaddr *oia; 1383 int s = splnet(); 1384 1385 ifa_remove(ifp, &ia->ia_ifa); 1386 1387 oia = ia; 1388 if (oia == (ia = in6_ifaddr)) 1389 in6_ifaddr = ia->ia_next; 1390 else { 1391 while (ia->ia_next && (ia->ia_next != oia)) 1392 ia = ia->ia_next; 1393 if (ia->ia_next) 1394 ia->ia_next = oia->ia_next; 1395 else { 1396 /* search failed */ 1397 printf("Couldn't unlink in6_ifaddr from in6_ifaddr\n"); 1398 } 1399 } 1400 1401 /* 1402 * XXX thorpej@NetBSD.org -- if the interface is going 1403 * XXX away, don't save the multicast entries, delete them! 1404 */ 1405 if (LIST_EMPTY(&oia->ia6_multiaddrs)) 1406 ; 1407 else if (oia->ia_ifa.ifa_ifp->if_output == if_nulloutput) { 1408 struct in6_multi *in6m, *next; 1409 1410 for (in6m = LIST_FIRST(&oia->ia6_multiaddrs); in6m != NULL; 1411 in6m = next) { 1412 next = LIST_NEXT(in6m, in6m_entry); 1413 in6_delmulti(in6m); 1414 } 1415 } else 1416 in6_savemkludge(oia); 1417 1418 /* 1419 * Release the reference to the base prefix. There should be a 1420 * positive reference. 1421 */ 1422 if (oia->ia6_ndpr == NULL) { 1423 nd6log((LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address " 1424 "%p has no prefix\n", oia)); 1425 } else { 1426 oia->ia6_ndpr->ndpr_refcnt--; 1427 oia->ia6_ndpr = NULL; 1428 } 1429 1430 /* 1431 * Also, if the address being removed is autoconf'ed, call 1432 * pfxlist_onlink_check() since the release might affect the status of 1433 * other (detached) addresses. 1434 */ 1435 if ((oia->ia6_flags & IN6_IFF_AUTOCONF) != 0) 1436 pfxlist_onlink_check(); 1437 1438 /* 1439 * release another refcnt for the link from in6_ifaddr. 1440 * Note that we should decrement the refcnt at least once for all *BSD. 1441 */ 1442 IFAFREE(&oia->ia_ifa); 1443 1444 splx(s); 1445 } 1446 1447 void 1448 in6_purgeif(struct ifnet *ifp) 1449 { 1450 if_purgeaddrs(ifp, AF_INET6, in6_purgeaddr); 1451 1452 in6_ifdetach(ifp); 1453 } 1454 1455 /* 1456 * SIOC[GAD]LIFADDR. 1457 * SIOCGLIFADDR: get first address. (?) 1458 * SIOCGLIFADDR with IFLR_PREFIX: 1459 * get first address that matches the specified prefix. 1460 * SIOCALIFADDR: add the specified address. 1461 * SIOCALIFADDR with IFLR_PREFIX: 1462 * add the specified prefix, filling hostid part from 1463 * the first link-local address. prefixlen must be <= 64. 1464 * SIOCDLIFADDR: delete the specified address. 1465 * SIOCDLIFADDR with IFLR_PREFIX: 1466 * delete the first address that matches the specified prefix. 1467 * return values: 1468 * EINVAL on invalid parameters 1469 * EADDRNOTAVAIL on prefix match failed/specified address not found 1470 * other values may be returned from in6_ioctl() 1471 * 1472 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1473 * this is to accommodate address naming scheme other than RFC2374, 1474 * in the future. 1475 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1476 * address encoding scheme. (see figure on page 8) 1477 */ 1478 static int 1479 in6_lifaddr_ioctl(struct socket *so, u_long cmd, void *data, 1480 struct ifnet *ifp, struct lwp *l) 1481 { 1482 struct in6_ifaddr *ia; 1483 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1484 struct ifaddr *ifa; 1485 struct sockaddr *sa; 1486 1487 /* sanity checks */ 1488 if (!data || !ifp) { 1489 panic("invalid argument to in6_lifaddr_ioctl"); 1490 /* NOTREACHED */ 1491 } 1492 1493 switch (cmd) { 1494 case SIOCGLIFADDR: 1495 /* address must be specified on GET with IFLR_PREFIX */ 1496 if ((iflr->flags & IFLR_PREFIX) == 0) 1497 break; 1498 /* FALLTHROUGH */ 1499 case SIOCALIFADDR: 1500 case SIOCDLIFADDR: 1501 /* address must be specified on ADD and DELETE */ 1502 sa = (struct sockaddr *)&iflr->addr; 1503 if (sa->sa_family != AF_INET6) 1504 return EINVAL; 1505 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1506 return EINVAL; 1507 /* XXX need improvement */ 1508 sa = (struct sockaddr *)&iflr->dstaddr; 1509 if (sa->sa_family && sa->sa_family != AF_INET6) 1510 return EINVAL; 1511 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1512 return EINVAL; 1513 break; 1514 default: /* shouldn't happen */ 1515 #if 0 1516 panic("invalid cmd to in6_lifaddr_ioctl"); 1517 /* NOTREACHED */ 1518 #else 1519 return EOPNOTSUPP; 1520 #endif 1521 } 1522 if (sizeof(struct in6_addr) * NBBY < iflr->prefixlen) 1523 return EINVAL; 1524 1525 switch (cmd) { 1526 case SIOCALIFADDR: 1527 { 1528 struct in6_aliasreq ifra; 1529 struct in6_addr *xhostid = NULL; 1530 int prefixlen; 1531 1532 if ((iflr->flags & IFLR_PREFIX) != 0) { 1533 struct sockaddr_in6 *sin6; 1534 1535 /* 1536 * xhostid is to fill in the hostid part of the 1537 * address. xhostid points to the first link-local 1538 * address attached to the interface. 1539 */ 1540 ia = in6ifa_ifpforlinklocal(ifp, 0); 1541 if (ia == NULL) 1542 return EADDRNOTAVAIL; 1543 xhostid = IFA_IN6(&ia->ia_ifa); 1544 1545 /* prefixlen must be <= 64. */ 1546 if (64 < iflr->prefixlen) 1547 return EINVAL; 1548 prefixlen = iflr->prefixlen; 1549 1550 /* hostid part must be zero. */ 1551 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1552 if (sin6->sin6_addr.s6_addr32[2] != 0 1553 || sin6->sin6_addr.s6_addr32[3] != 0) { 1554 return EINVAL; 1555 } 1556 } else 1557 prefixlen = iflr->prefixlen; 1558 1559 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1560 memset(&ifra, 0, sizeof(ifra)); 1561 memcpy( ifra.ifra_name, iflr->iflr_name, sizeof(ifra.ifra_name)); 1562 1563 memcpy( &ifra.ifra_addr, &iflr->addr, 1564 ((struct sockaddr *)&iflr->addr)->sa_len); 1565 if (xhostid) { 1566 /* fill in hostid part */ 1567 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1568 xhostid->s6_addr32[2]; 1569 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1570 xhostid->s6_addr32[3]; 1571 } 1572 1573 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1574 memcpy( &ifra.ifra_dstaddr, &iflr->dstaddr, 1575 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1576 if (xhostid) { 1577 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1578 xhostid->s6_addr32[2]; 1579 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1580 xhostid->s6_addr32[3]; 1581 } 1582 } 1583 1584 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1585 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1586 1587 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 1588 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 1589 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1590 return in6_control(so, SIOCAIFADDR_IN6, (void *)&ifra, ifp, l); 1591 } 1592 case SIOCGLIFADDR: 1593 case SIOCDLIFADDR: 1594 { 1595 struct in6_addr mask, candidate, match; 1596 struct sockaddr_in6 *sin6; 1597 int cmp; 1598 1599 memset(&mask, 0, sizeof(mask)); 1600 if (iflr->flags & IFLR_PREFIX) { 1601 /* lookup a prefix rather than address. */ 1602 in6_prefixlen2mask(&mask, iflr->prefixlen); 1603 1604 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1605 memcpy( &match, &sin6->sin6_addr, sizeof(match)); 1606 match.s6_addr32[0] &= mask.s6_addr32[0]; 1607 match.s6_addr32[1] &= mask.s6_addr32[1]; 1608 match.s6_addr32[2] &= mask.s6_addr32[2]; 1609 match.s6_addr32[3] &= mask.s6_addr32[3]; 1610 1611 /* if you set extra bits, that's wrong */ 1612 if (memcmp(&match, &sin6->sin6_addr, sizeof(match))) 1613 return EINVAL; 1614 1615 cmp = 1; 1616 } else { 1617 if (cmd == SIOCGLIFADDR) { 1618 /* on getting an address, take the 1st match */ 1619 cmp = 0; /* XXX */ 1620 } else { 1621 /* on deleting an address, do exact match */ 1622 in6_prefixlen2mask(&mask, 128); 1623 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1624 memcpy( &match, &sin6->sin6_addr, sizeof(match)); 1625 1626 cmp = 1; 1627 } 1628 } 1629 1630 IFADDR_FOREACH(ifa, ifp) { 1631 if (ifa->ifa_addr->sa_family != AF_INET6) 1632 continue; 1633 if (!cmp) 1634 break; 1635 1636 /* 1637 * XXX: this is adhoc, but is necessary to allow 1638 * a user to specify fe80::/64 (not /10) for a 1639 * link-local address. 1640 */ 1641 memcpy( &candidate, IFA_IN6(ifa), sizeof(candidate)); 1642 in6_clearscope(&candidate); 1643 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1644 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1645 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1646 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1647 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1648 break; 1649 } 1650 if (!ifa) 1651 return EADDRNOTAVAIL; 1652 ia = ifa2ia6(ifa); 1653 1654 if (cmd == SIOCGLIFADDR) { 1655 int error; 1656 1657 /* fill in the if_laddrreq structure */ 1658 memcpy( &iflr->addr, &ia->ia_addr, ia->ia_addr.sin6_len); 1659 error = sa6_recoverscope( 1660 (struct sockaddr_in6 *)&iflr->addr); 1661 if (error != 0) 1662 return error; 1663 1664 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1665 memcpy( &iflr->dstaddr, &ia->ia_dstaddr, 1666 ia->ia_dstaddr.sin6_len); 1667 error = sa6_recoverscope( 1668 (struct sockaddr_in6 *)&iflr->dstaddr); 1669 if (error != 0) 1670 return error; 1671 } else 1672 memset(&iflr->dstaddr, 0, sizeof(iflr->dstaddr)); 1673 1674 iflr->prefixlen = 1675 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1676 1677 iflr->flags = ia->ia6_flags; /* XXX */ 1678 1679 return 0; 1680 } else { 1681 struct in6_aliasreq ifra; 1682 1683 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1684 memset(&ifra, 0, sizeof(ifra)); 1685 memcpy( ifra.ifra_name, iflr->iflr_name, 1686 sizeof(ifra.ifra_name)); 1687 1688 memcpy( &ifra.ifra_addr, &ia->ia_addr, 1689 ia->ia_addr.sin6_len); 1690 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1691 memcpy( &ifra.ifra_dstaddr, &ia->ia_dstaddr, 1692 ia->ia_dstaddr.sin6_len); 1693 } else { 1694 memset(&ifra.ifra_dstaddr, 0, 1695 sizeof(ifra.ifra_dstaddr)); 1696 } 1697 memcpy( &ifra.ifra_dstaddr, &ia->ia_prefixmask, 1698 ia->ia_prefixmask.sin6_len); 1699 1700 ifra.ifra_flags = ia->ia6_flags; 1701 return in6_control(so, SIOCDIFADDR_IN6, (void *)&ifra, 1702 ifp, l); 1703 } 1704 } 1705 } 1706 1707 return EOPNOTSUPP; /* just for safety */ 1708 } 1709 1710 /* 1711 * Initialize an interface's internet6 address 1712 * and routing table entry. 1713 */ 1714 static int 1715 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1716 const struct sockaddr_in6 *sin6, int newhost) 1717 { 1718 int error = 0, plen, ifacount = 0; 1719 int s = splnet(); 1720 struct ifaddr *ifa; 1721 1722 /* 1723 * Give the interface a chance to initialize 1724 * if this is its first address, 1725 * and to validate the address if necessary. 1726 */ 1727 IFADDR_FOREACH(ifa, ifp) { 1728 if (ifa->ifa_addr == NULL) 1729 continue; /* just for safety */ 1730 if (ifa->ifa_addr->sa_family != AF_INET6) 1731 continue; 1732 ifacount++; 1733 } 1734 1735 ia->ia_addr = *sin6; 1736 1737 if (ifacount <= 1 && 1738 (error = (*ifp->if_ioctl)(ifp, SIOCINITIFADDR, ia)) != 0) { 1739 splx(s); 1740 return error; 1741 } 1742 splx(s); 1743 1744 ia->ia_ifa.ifa_metric = ifp->if_metric; 1745 1746 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1747 1748 /* 1749 * Special case: 1750 * If the destination address is specified for a point-to-point 1751 * interface, install a route to the destination as an interface 1752 * direct route. 1753 */ 1754 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1755 if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) { 1756 if ((error = rtinit(&ia->ia_ifa, RTM_ADD, 1757 RTF_UP | RTF_HOST)) != 0) 1758 return error; 1759 ia->ia_flags |= IFA_ROUTE; 1760 } 1761 1762 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1763 if (newhost) { 1764 /* set the rtrequest function to create llinfo */ 1765 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1766 in6_ifaddloop(&ia->ia_ifa); 1767 } 1768 1769 if (ifp->if_flags & IFF_MULTICAST) 1770 in6_restoremkludge(ia, ifp); 1771 1772 return error; 1773 } 1774 1775 /* 1776 * Find an IPv6 interface link-local address specific to an interface. 1777 */ 1778 struct in6_ifaddr * 1779 in6ifa_ifpforlinklocal(const struct ifnet *ifp, const int ignoreflags) 1780 { 1781 struct ifaddr *ifa; 1782 1783 IFADDR_FOREACH(ifa, ifp) { 1784 if (ifa->ifa_addr == NULL) 1785 continue; /* just for safety */ 1786 if (ifa->ifa_addr->sa_family != AF_INET6) 1787 continue; 1788 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1789 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1790 ignoreflags) != 0) 1791 continue; 1792 break; 1793 } 1794 } 1795 1796 return (struct in6_ifaddr *)ifa; 1797 } 1798 1799 1800 /* 1801 * find the internet address corresponding to a given interface and address. 1802 */ 1803 struct in6_ifaddr * 1804 in6ifa_ifpwithaddr(const struct ifnet *ifp, const struct in6_addr *addr) 1805 { 1806 struct ifaddr *ifa; 1807 1808 IFADDR_FOREACH(ifa, ifp) { 1809 if (ifa->ifa_addr == NULL) 1810 continue; /* just for safety */ 1811 if (ifa->ifa_addr->sa_family != AF_INET6) 1812 continue; 1813 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1814 break; 1815 } 1816 1817 return (struct in6_ifaddr *)ifa; 1818 } 1819 1820 /* 1821 * find the internet address on a given interface corresponding to a neighbor's 1822 * address. 1823 */ 1824 struct in6_ifaddr * 1825 in6ifa_ifplocaladdr(const struct ifnet *ifp, const struct in6_addr *addr) 1826 { 1827 struct ifaddr *ifa; 1828 struct in6_ifaddr *ia; 1829 1830 IFADDR_FOREACH(ifa, ifp) { 1831 if (ifa->ifa_addr == NULL) 1832 continue; /* just for safety */ 1833 if (ifa->ifa_addr->sa_family != AF_INET6) 1834 continue; 1835 ia = (struct in6_ifaddr *)ifa; 1836 if (IN6_ARE_MASKED_ADDR_EQUAL(addr, 1837 &ia->ia_addr.sin6_addr, 1838 &ia->ia_prefixmask.sin6_addr)) 1839 return ia; 1840 } 1841 1842 return NULL; 1843 } 1844 1845 /* 1846 * Convert IP6 address to printable (loggable) representation. 1847 */ 1848 static int ip6round = 0; 1849 char * 1850 ip6_sprintf(const struct in6_addr *addr) 1851 { 1852 static char ip6buf[8][48]; 1853 int i; 1854 char *cp; 1855 const u_int16_t *a = (const u_int16_t *)addr; 1856 const u_int8_t *d; 1857 int dcolon = 0; 1858 1859 ip6round = (ip6round + 1) & 7; 1860 cp = ip6buf[ip6round]; 1861 1862 for (i = 0; i < 8; i++) { 1863 if (dcolon == 1) { 1864 if (*a == 0) { 1865 if (i == 7) 1866 *cp++ = ':'; 1867 a++; 1868 continue; 1869 } else 1870 dcolon = 2; 1871 } 1872 if (*a == 0) { 1873 if (dcolon == 0 && *(a + 1) == 0) { 1874 if (i == 0) 1875 *cp++ = ':'; 1876 *cp++ = ':'; 1877 dcolon = 1; 1878 } else { 1879 *cp++ = '0'; 1880 *cp++ = ':'; 1881 } 1882 a++; 1883 continue; 1884 } 1885 d = (const u_char *)a; 1886 *cp++ = hexdigits[*d >> 4]; 1887 *cp++ = hexdigits[*d++ & 0xf]; 1888 *cp++ = hexdigits[*d >> 4]; 1889 *cp++ = hexdigits[*d & 0xf]; 1890 *cp++ = ':'; 1891 a++; 1892 } 1893 *--cp = 0; 1894 return ip6buf[ip6round]; 1895 } 1896 1897 /* 1898 * Determine if an address is on a local network. 1899 */ 1900 int 1901 in6_localaddr(const struct in6_addr *in6) 1902 { 1903 struct in6_ifaddr *ia; 1904 1905 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1906 return 1; 1907 1908 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 1909 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1910 &ia->ia_prefixmask.sin6_addr)) 1911 return 1; 1912 1913 return 0; 1914 } 1915 1916 int 1917 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1918 { 1919 struct in6_ifaddr *ia; 1920 1921 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1922 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1923 &sa6->sin6_addr) && 1924 #ifdef SCOPEDROUTING 1925 ia->ia_addr.sin6_scope_id == sa6->sin6_scope_id && 1926 #endif 1927 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) 1928 return 1; /* true */ 1929 1930 /* XXX: do we still have to go thru the rest of the list? */ 1931 } 1932 1933 return 0; /* false */ 1934 } 1935 1936 /* 1937 * return length of part which dst and src are equal 1938 * hard coding... 1939 */ 1940 int 1941 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1942 { 1943 int match = 0; 1944 u_char *s = (u_char *)src, *d = (u_char *)dst; 1945 u_char *lim = s + 16, r; 1946 1947 while (s < lim) 1948 if ((r = (*d++ ^ *s++)) != 0) { 1949 while (r < 128) { 1950 match++; 1951 r <<= 1; 1952 } 1953 break; 1954 } else 1955 match += NBBY; 1956 return match; 1957 } 1958 1959 /* XXX: to be scope conscious */ 1960 int 1961 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1962 { 1963 int bytelen, bitlen; 1964 1965 /* sanity check */ 1966 if (len < 0 || len > 128) { 1967 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1968 len); 1969 return 0; 1970 } 1971 1972 bytelen = len / NBBY; 1973 bitlen = len % NBBY; 1974 1975 if (memcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1976 return 0; 1977 if (bitlen != 0 && 1978 p1->s6_addr[bytelen] >> (NBBY - bitlen) != 1979 p2->s6_addr[bytelen] >> (NBBY - bitlen)) 1980 return 0; 1981 1982 return 1; 1983 } 1984 1985 void 1986 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1987 { 1988 static const u_char maskarray[NBBY] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1989 int bytelen, bitlen, i; 1990 1991 /* sanity check */ 1992 if (len < 0 || len > 128) { 1993 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1994 len); 1995 return; 1996 } 1997 1998 memset(maskp, 0, sizeof(*maskp)); 1999 bytelen = len / NBBY; 2000 bitlen = len % NBBY; 2001 for (i = 0; i < bytelen; i++) 2002 maskp->s6_addr[i] = 0xff; 2003 if (bitlen) 2004 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 2005 } 2006 2007 /* 2008 * return the best address out of the same scope. if no address was 2009 * found, return the first valid address from designated IF. 2010 */ 2011 struct in6_ifaddr * 2012 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2013 { 2014 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2015 struct ifaddr *ifa; 2016 struct in6_ifaddr *besta = 0; 2017 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2018 2019 dep[0] = dep[1] = NULL; 2020 2021 /* 2022 * We first look for addresses in the same scope. 2023 * If there is one, return it. 2024 * If two or more, return one which matches the dst longest. 2025 * If none, return one of global addresses assigned other ifs. 2026 */ 2027 IFADDR_FOREACH(ifa, ifp) { 2028 if (ifa->ifa_addr->sa_family != AF_INET6) 2029 continue; 2030 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2031 continue; /* XXX: is there any case to allow anycast? */ 2032 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2033 continue; /* don't use this interface */ 2034 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2035 continue; 2036 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2037 if (ip6_use_deprecated) 2038 dep[0] = (struct in6_ifaddr *)ifa; 2039 continue; 2040 } 2041 2042 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2043 /* 2044 * call in6_matchlen() as few as possible 2045 */ 2046 if (besta) { 2047 if (blen == -1) 2048 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2049 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2050 if (tlen > blen) { 2051 blen = tlen; 2052 besta = (struct in6_ifaddr *)ifa; 2053 } 2054 } else 2055 besta = (struct in6_ifaddr *)ifa; 2056 } 2057 } 2058 if (besta) 2059 return besta; 2060 2061 IFADDR_FOREACH(ifa, ifp) { 2062 if (ifa->ifa_addr->sa_family != AF_INET6) 2063 continue; 2064 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2065 continue; /* XXX: is there any case to allow anycast? */ 2066 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2067 continue; /* don't use this interface */ 2068 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2069 continue; 2070 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2071 if (ip6_use_deprecated) 2072 dep[1] = (struct in6_ifaddr *)ifa; 2073 continue; 2074 } 2075 2076 return (struct in6_ifaddr *)ifa; 2077 } 2078 2079 /* use the last-resort values, that are, deprecated addresses */ 2080 if (dep[0]) 2081 return dep[0]; 2082 if (dep[1]) 2083 return dep[1]; 2084 2085 return NULL; 2086 } 2087 2088 /* 2089 * perform DAD when interface becomes IFF_UP. 2090 */ 2091 void 2092 in6_if_up(struct ifnet *ifp) 2093 { 2094 struct ifaddr *ifa; 2095 struct in6_ifaddr *ia; 2096 2097 IFADDR_FOREACH(ifa, ifp) { 2098 if (ifa->ifa_addr->sa_family != AF_INET6) 2099 continue; 2100 ia = (struct in6_ifaddr *)ifa; 2101 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2102 /* 2103 * The TENTATIVE flag was likely set by hand 2104 * beforehand, implicitly indicating the need for DAD. 2105 * We may be able to skip the random delay in this 2106 * case, but we impose delays just in case. 2107 */ 2108 nd6_dad_start(ifa, 2109 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 2110 } 2111 } 2112 2113 /* 2114 * special cases, like 6to4, are handled in in6_ifattach 2115 */ 2116 in6_ifattach(ifp, NULL); 2117 } 2118 2119 int 2120 in6if_do_dad(struct ifnet *ifp) 2121 { 2122 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 2123 return 0; 2124 2125 switch (ifp->if_type) { 2126 case IFT_FAITH: 2127 /* 2128 * These interfaces do not have the IFF_LOOPBACK flag, 2129 * but loop packets back. We do not have to do DAD on such 2130 * interfaces. We should even omit it, because loop-backed 2131 * NS would confuse the DAD procedure. 2132 */ 2133 return 0; 2134 default: 2135 /* 2136 * Our DAD routine requires the interface up and running. 2137 * However, some interfaces can be up before the RUNNING 2138 * status. Additionaly, users may try to assign addresses 2139 * before the interface becomes up (or running). 2140 * We simply skip DAD in such a case as a work around. 2141 * XXX: we should rather mark "tentative" on such addresses, 2142 * and do DAD after the interface becomes ready. 2143 */ 2144 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != 2145 (IFF_UP|IFF_RUNNING)) 2146 return 0; 2147 2148 return 1; 2149 } 2150 } 2151 2152 /* 2153 * Calculate max IPv6 MTU through all the interfaces and store it 2154 * to in6_maxmtu. 2155 */ 2156 void 2157 in6_setmaxmtu(void) 2158 { 2159 unsigned long maxmtu = 0; 2160 struct ifnet *ifp; 2161 2162 TAILQ_FOREACH(ifp, &ifnet, if_list) { 2163 /* this function can be called during ifnet initialization */ 2164 if (!ifp->if_afdata[AF_INET6]) 2165 continue; 2166 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2167 IN6_LINKMTU(ifp) > maxmtu) 2168 maxmtu = IN6_LINKMTU(ifp); 2169 } 2170 if (maxmtu) /* update only when maxmtu is positive */ 2171 in6_maxmtu = maxmtu; 2172 } 2173 2174 /* 2175 * Provide the length of interface identifiers to be used for the link attached 2176 * to the given interface. The length should be defined in "IPv6 over 2177 * xxx-link" document. Note that address architecture might also define 2178 * the length for a particular set of address prefixes, regardless of the 2179 * link type. As clarified in rfc2462bis, those two definitions should be 2180 * consistent, and those really are as of August 2004. 2181 */ 2182 int 2183 in6_if2idlen(struct ifnet *ifp) 2184 { 2185 switch (ifp->if_type) { 2186 case IFT_ETHER: /* RFC2464 */ 2187 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2188 case IFT_L2VLAN: /* ditto */ 2189 case IFT_IEEE80211: /* ditto */ 2190 case IFT_FDDI: /* RFC2467 */ 2191 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 2192 case IFT_PPP: /* RFC2472 */ 2193 case IFT_ARCNET: /* RFC2497 */ 2194 case IFT_FRELAY: /* RFC2590 */ 2195 case IFT_IEEE1394: /* RFC3146 */ 2196 case IFT_GIF: /* draft-ietf-v6ops-mech-v2-07 */ 2197 case IFT_LOOP: /* XXX: is this really correct? */ 2198 return 64; 2199 default: 2200 /* 2201 * Unknown link type: 2202 * It might be controversial to use the today's common constant 2203 * of 64 for these cases unconditionally. For full compliance, 2204 * we should return an error in this case. On the other hand, 2205 * if we simply miss the standard for the link type or a new 2206 * standard is defined for a new link type, the IFID length 2207 * is very likely to be the common constant. As a compromise, 2208 * we always use the constant, but make an explicit notice 2209 * indicating the "unknown" case. 2210 */ 2211 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2212 return 64; 2213 } 2214 } 2215 2216 void * 2217 in6_domifattach(struct ifnet *ifp) 2218 { 2219 struct in6_ifextra *ext; 2220 2221 ext = malloc(sizeof(*ext), M_IFADDR, M_WAITOK|M_ZERO); 2222 2223 ext->in6_ifstat = malloc(sizeof(struct in6_ifstat), 2224 M_IFADDR, M_WAITOK|M_ZERO); 2225 2226 ext->icmp6_ifstat = malloc(sizeof(struct icmp6_ifstat), 2227 M_IFADDR, M_WAITOK|M_ZERO); 2228 2229 ext->nd_ifinfo = nd6_ifattach(ifp); 2230 ext->scope6_id = scope6_ifattach(ifp); 2231 return ext; 2232 } 2233 2234 void 2235 in6_domifdetach(struct ifnet *ifp, void *aux) 2236 { 2237 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2238 2239 nd6_ifdetach(ext->nd_ifinfo); 2240 free(ext->in6_ifstat, M_IFADDR); 2241 free(ext->icmp6_ifstat, M_IFADDR); 2242 scope6_ifdetach(ext->scope6_id); 2243 free(ext, M_IFADDR); 2244 } 2245 2246 /* 2247 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2248 * v4 mapped addr or v4 compat addr 2249 */ 2250 void 2251 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2252 { 2253 memset(sin, 0, sizeof(*sin)); 2254 sin->sin_len = sizeof(struct sockaddr_in); 2255 sin->sin_family = AF_INET; 2256 sin->sin_port = sin6->sin6_port; 2257 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2258 } 2259 2260 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2261 void 2262 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2263 { 2264 memset(sin6, 0, sizeof(*sin6)); 2265 sin6->sin6_len = sizeof(struct sockaddr_in6); 2266 sin6->sin6_family = AF_INET6; 2267 sin6->sin6_port = sin->sin_port; 2268 sin6->sin6_addr.s6_addr32[0] = 0; 2269 sin6->sin6_addr.s6_addr32[1] = 0; 2270 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2271 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2272 } 2273 2274 /* Convert sockaddr_in6 into sockaddr_in. */ 2275 void 2276 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2277 { 2278 struct sockaddr_in *sin_p; 2279 struct sockaddr_in6 sin6; 2280 2281 /* 2282 * Save original sockaddr_in6 addr and convert it 2283 * to sockaddr_in. 2284 */ 2285 sin6 = *(struct sockaddr_in6 *)nam; 2286 sin_p = (struct sockaddr_in *)nam; 2287 in6_sin6_2_sin(sin_p, &sin6); 2288 } 2289 2290 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2291 void 2292 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2293 { 2294 struct sockaddr_in *sin_p; 2295 struct sockaddr_in6 *sin6_p; 2296 2297 sin6_p = malloc(sizeof(*sin6_p), M_SONAME, M_WAITOK); 2298 sin_p = (struct sockaddr_in *)*nam; 2299 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2300 free(*nam, M_SONAME); 2301 *nam = (struct sockaddr *)sin6_p; 2302 } 2303