1 /* $NetBSD: in6.c,v 1.143 2008/12/19 18:49:39 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 1.143 2008/12/19 18:49:39 cegger Exp $"); 66 67 #include "opt_inet.h" 68 #include "opt_pfil_hooks.h" 69 70 #include <sys/param.h> 71 #include <sys/ioctl.h> 72 #include <sys/errno.h> 73 #include <sys/malloc.h> 74 #include <sys/socket.h> 75 #include <sys/socketvar.h> 76 #include <sys/sockio.h> 77 #include <sys/systm.h> 78 #include <sys/proc.h> 79 #include <sys/time.h> 80 #include <sys/kernel.h> 81 #include <sys/syslog.h> 82 #include <sys/kauth.h> 83 84 #include <net/if.h> 85 #include <net/if_types.h> 86 #include <net/route.h> 87 #include <net/if_dl.h> 88 89 #include <netinet/in.h> 90 #include <netinet/in_var.h> 91 #include <net/if_ether.h> 92 93 #include <netinet/ip6.h> 94 #include <netinet6/ip6_var.h> 95 #include <netinet6/nd6.h> 96 #include <netinet6/mld6_var.h> 97 #include <netinet6/ip6_mroute.h> 98 #include <netinet6/in6_ifattach.h> 99 #include <netinet6/scope6_var.h> 100 101 #include <net/net_osdep.h> 102 103 #ifdef PFIL_HOOKS 104 #include <net/pfil.h> 105 #endif 106 107 MALLOC_DEFINE(M_IP6OPT, "ip6_options", "IPv6 options"); 108 109 /* enable backward compatibility code for obsoleted ioctls */ 110 #define COMPAT_IN6IFIOCTL 111 112 #ifdef IN6_DEBUG 113 #define IN6_DPRINTF(__fmt, ...) printf(__fmt, __VA_ARGS__) 114 #else 115 #define IN6_DPRINTF(__fmt, ...) do { } while (/*CONSTCOND*/0) 116 #endif /* IN6_DEBUG */ 117 118 /* 119 * Definitions of some constant IP6 addresses. 120 */ 121 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 122 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 123 const struct in6_addr in6addr_nodelocal_allnodes = 124 IN6ADDR_NODELOCAL_ALLNODES_INIT; 125 const struct in6_addr in6addr_linklocal_allnodes = 126 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 127 const struct in6_addr in6addr_linklocal_allrouters = 128 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 129 130 const struct in6_addr in6mask0 = IN6MASK0; 131 const struct in6_addr in6mask32 = IN6MASK32; 132 const struct in6_addr in6mask64 = IN6MASK64; 133 const struct in6_addr in6mask96 = IN6MASK96; 134 const struct in6_addr in6mask128 = IN6MASK128; 135 136 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6, 137 0, 0, IN6ADDR_ANY_INIT, 0}; 138 139 static int in6_lifaddr_ioctl(struct socket *, u_long, void *, 140 struct ifnet *, struct lwp *); 141 static int in6_ifinit(struct ifnet *, struct in6_ifaddr *, 142 struct sockaddr_in6 *, int); 143 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 144 145 /* 146 * Subroutine for in6_ifaddloop() and in6_ifremloop(). 147 * This routine does actual work. 148 */ 149 static void 150 in6_ifloop_request(int cmd, struct ifaddr *ifa) 151 { 152 struct sockaddr_in6 lo_sa; 153 struct sockaddr_in6 all1_sa; 154 struct rtentry *nrt = NULL; 155 int e; 156 157 sockaddr_in6_init(&all1_sa, &in6mask128, 0, 0, 0); 158 sockaddr_in6_init(&lo_sa, &in6addr_loopback, 0, 0, 0); 159 160 /* 161 * We specify the address itself as the gateway, and set the 162 * RTF_LLINFO flag, so that the corresponding host route would have 163 * the flag, and thus applications that assume traditional behavior 164 * would be happy. Note that we assume the caller of the function 165 * (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest, 166 * which changes the outgoing interface to the loopback interface. 167 */ 168 e = rtrequest(cmd, ifa->ifa_addr, ifa->ifa_addr, 169 (struct sockaddr *)&all1_sa, RTF_UP|RTF_HOST|RTF_LLINFO, &nrt); 170 if (e != 0) { 171 log(LOG_ERR, "in6_ifloop_request: " 172 "%s operation failed for %s (errno=%d)\n", 173 cmd == RTM_ADD ? "ADD" : "DELETE", 174 ip6_sprintf(&((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr), 175 e); 176 } 177 178 /* 179 * Make sure rt_ifa be equal to IFA, the second argument of the 180 * function. 181 * We need this because when we refer to rt_ifa->ia6_flags in 182 * ip6_input, we assume that the rt_ifa points to the address instead 183 * of the loopback address. 184 */ 185 if (cmd == RTM_ADD && nrt && ifa != nrt->rt_ifa) 186 rt_replace_ifa(nrt, ifa); 187 188 /* 189 * Report the addition/removal of the address to the routing socket. 190 * XXX: since we called rtinit for a p2p interface with a destination, 191 * we end up reporting twice in such a case. Should we rather 192 * omit the second report? 193 */ 194 if (nrt) { 195 rt_newaddrmsg(cmd, ifa, e, nrt); 196 if (cmd == RTM_DELETE) { 197 if (nrt->rt_refcnt <= 0) { 198 /* XXX: we should free the entry ourselves. */ 199 nrt->rt_refcnt++; 200 rtfree(nrt); 201 } 202 } else { 203 /* the cmd must be RTM_ADD here */ 204 nrt->rt_refcnt--; 205 } 206 } 207 } 208 209 /* 210 * Add ownaddr as loopback rtentry. We previously add the route only if 211 * necessary (ex. on a p2p link). However, since we now manage addresses 212 * separately from prefixes, we should always add the route. We can't 213 * rely on the cloning mechanism from the corresponding interface route 214 * any more. 215 */ 216 void 217 in6_ifaddloop(struct ifaddr *ifa) 218 { 219 struct rtentry *rt; 220 221 /* If there is no loopback entry, allocate one. */ 222 rt = rtalloc1(ifa->ifa_addr, 0); 223 if (rt == NULL || (rt->rt_flags & RTF_HOST) == 0 || 224 (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) 225 in6_ifloop_request(RTM_ADD, ifa); 226 if (rt != NULL) 227 rt->rt_refcnt--; 228 } 229 230 /* 231 * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(), 232 * if it exists. 233 */ 234 void 235 in6_ifremloop(struct ifaddr *ifa) 236 { 237 struct in6_ifaddr *alt_ia = NULL, *ia; 238 struct rtentry *rt; 239 int ia_count = 0; 240 241 /* 242 * Some of BSD variants do not remove cloned routes 243 * from an interface direct route, when removing the direct route 244 * (see comments in net/net_osdep.h). Even for variants that do remove 245 * cloned routes, they could fail to remove the cloned routes when 246 * we handle multple addresses that share a common prefix. 247 * So, we should remove the route corresponding to the deleted address. 248 */ 249 250 /* 251 * Delete the entry only if exactly one ifaddr matches the 252 * address, ifa->ifa_addr. 253 * 254 * If more than one ifaddr matches, replace the ifaddr in 255 * the routing table, rt_ifa, with a different ifaddr than 256 * the one we are purging, ifa. It is important to do 257 * this, or else the routing table can accumulate dangling 258 * pointers rt->rt_ifa->ifa_ifp to destroyed interfaces, 259 * which will lead to crashes, later. (More than one ifaddr 260 * can match if we assign the same address to multiple---probably 261 * p2p---interfaces.) 262 * 263 * XXX An old comment at this place said, "we should avoid 264 * XXX such a configuration [i.e., interfaces with the same 265 * XXX addressed assigned --ed.] in IPv6...". I do not 266 * XXX agree, especially now that I have fixed the dangling 267 * XXX ifp-pointers bug. 268 */ 269 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 270 if (!IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) 271 continue; 272 if (ia->ia_ifp != ifa->ifa_ifp) 273 alt_ia = ia; 274 if (++ia_count > 1 && alt_ia != NULL) 275 break; 276 } 277 278 if (ia_count == 0) 279 return; 280 281 if ((rt = rtalloc1(ifa->ifa_addr, 0)) == NULL) 282 return; 283 rt->rt_refcnt--; 284 285 /* 286 * Before deleting, check if a corresponding loopbacked 287 * host route surely exists. With this check, we can avoid 288 * deleting an interface direct route whose destination is 289 * the same as the address being removed. This can happen 290 * when removing a subnet-router anycast address on an 291 * interface attached to a shared medium. 292 */ 293 if ((rt->rt_flags & RTF_HOST) == 0 || 294 (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) 295 return; 296 297 /* If we cannot replace the route's ifaddr with the equivalent 298 * ifaddr of another interface, I believe it is safest to 299 * delete the route. 300 */ 301 if (ia_count == 1 || alt_ia == NULL) 302 in6_ifloop_request(RTM_DELETE, ifa); 303 else 304 rt_replace_ifa(rt, &alt_ia->ia_ifa); 305 } 306 307 int 308 in6_mask2len(struct in6_addr *mask, u_char *lim0) 309 { 310 int x = 0, y; 311 u_char *lim = lim0, *p; 312 313 /* ignore the scope_id part */ 314 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 315 lim = (u_char *)mask + sizeof(*mask); 316 for (p = (u_char *)mask; p < lim; x++, p++) { 317 if (*p != 0xff) 318 break; 319 } 320 y = 0; 321 if (p < lim) { 322 for (y = 0; y < NBBY; y++) { 323 if ((*p & (0x80 >> y)) == 0) 324 break; 325 } 326 } 327 328 /* 329 * when the limit pointer is given, do a stricter check on the 330 * remaining bits. 331 */ 332 if (p < lim) { 333 if (y != 0 && (*p & (0x00ff >> y)) != 0) 334 return -1; 335 for (p = p + 1; p < lim; p++) 336 if (*p != 0) 337 return -1; 338 } 339 340 return x * NBBY + y; 341 } 342 343 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 344 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 345 346 static int 347 in6_control1(struct socket *so, u_long cmd, void *data, struct ifnet *ifp, 348 struct lwp *l, int privileged) 349 { 350 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 351 struct in6_ifaddr *ia = NULL; 352 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 353 struct sockaddr_in6 *sa6; 354 int error; 355 switch (cmd) { 356 /* 357 * XXX: Fix me, once we fix SIOCSIFADDR, SIOCIFDSTADDR, etc. 358 */ 359 case SIOCSIFADDR: 360 case SIOCSIFDSTADDR: 361 #ifdef SIOCSIFCONF_X25 362 case SIOCSIFCONF_X25: 363 #endif 364 return EOPNOTSUPP; 365 case SIOCGETSGCNT_IN6: 366 case SIOCGETMIFCNT_IN6: 367 return mrt6_ioctl(cmd, data); 368 } 369 370 if (ifp == NULL) 371 return EOPNOTSUPP; 372 373 switch (cmd) { 374 case SIOCSNDFLUSH_IN6: 375 case SIOCSPFXFLUSH_IN6: 376 case SIOCSRTRFLUSH_IN6: 377 case SIOCSDEFIFACE_IN6: 378 case SIOCSIFINFO_FLAGS: 379 case SIOCSIFINFO_IN6: 380 if (!privileged) 381 return EPERM; 382 /* FALLTHROUGH */ 383 case OSIOCGIFINFO_IN6: 384 case SIOCGIFINFO_IN6: 385 case SIOCGDRLST_IN6: 386 case SIOCGPRLST_IN6: 387 case SIOCGNBRINFO_IN6: 388 case SIOCGDEFIFACE_IN6: 389 return nd6_ioctl(cmd, data, ifp); 390 } 391 392 switch (cmd) { 393 case SIOCSIFPREFIX_IN6: 394 case SIOCDIFPREFIX_IN6: 395 case SIOCAIFPREFIX_IN6: 396 case SIOCCIFPREFIX_IN6: 397 case SIOCSGIFPREFIX_IN6: 398 case SIOCGIFPREFIX_IN6: 399 log(LOG_NOTICE, 400 "prefix ioctls are now invalidated. " 401 "please use ifconfig.\n"); 402 return EOPNOTSUPP; 403 } 404 405 switch (cmd) { 406 case SIOCALIFADDR: 407 case SIOCDLIFADDR: 408 if (!privileged) 409 return EPERM; 410 /* FALLTHROUGH */ 411 case SIOCGLIFADDR: 412 return in6_lifaddr_ioctl(so, cmd, data, ifp, l); 413 } 414 415 /* 416 * Find address for this interface, if it exists. 417 * 418 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 419 * only, and used the first interface address as the target of other 420 * operations (without checking ifra_addr). This was because netinet 421 * code/API assumed at most 1 interface address per interface. 422 * Since IPv6 allows a node to assign multiple addresses 423 * on a single interface, we almost always look and check the 424 * presence of ifra_addr, and reject invalid ones here. 425 * It also decreases duplicated code among SIOC*_IN6 operations. 426 */ 427 switch (cmd) { 428 case SIOCAIFADDR_IN6: 429 case SIOCSIFPHYADDR_IN6: 430 sa6 = &ifra->ifra_addr; 431 break; 432 case SIOCSIFADDR_IN6: 433 case SIOCGIFADDR_IN6: 434 case SIOCSIFDSTADDR_IN6: 435 case SIOCSIFNETMASK_IN6: 436 case SIOCGIFDSTADDR_IN6: 437 case SIOCGIFNETMASK_IN6: 438 case SIOCDIFADDR_IN6: 439 case SIOCGIFPSRCADDR_IN6: 440 case SIOCGIFPDSTADDR_IN6: 441 case SIOCGIFAFLAG_IN6: 442 case SIOCSNDFLUSH_IN6: 443 case SIOCSPFXFLUSH_IN6: 444 case SIOCSRTRFLUSH_IN6: 445 case SIOCGIFALIFETIME_IN6: 446 case SIOCGIFSTAT_IN6: 447 case SIOCGIFSTAT_ICMP6: 448 sa6 = &ifr->ifr_addr; 449 break; 450 default: 451 sa6 = NULL; 452 break; 453 } 454 if (sa6 && sa6->sin6_family == AF_INET6) { 455 if (sa6->sin6_scope_id != 0) 456 error = sa6_embedscope(sa6, 0); 457 else 458 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 459 if (error != 0) 460 return error; 461 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 462 } else 463 ia = NULL; 464 465 switch (cmd) { 466 case SIOCSIFADDR_IN6: 467 case SIOCSIFDSTADDR_IN6: 468 case SIOCSIFNETMASK_IN6: 469 /* 470 * Since IPv6 allows a node to assign multiple addresses 471 * on a single interface, SIOCSIFxxx ioctls are deprecated. 472 */ 473 return EINVAL; 474 475 case SIOCDIFADDR_IN6: 476 /* 477 * for IPv4, we look for existing in_ifaddr here to allow 478 * "ifconfig if0 delete" to remove the first IPv4 address on 479 * the interface. For IPv6, as the spec allows multiple 480 * interface address from the day one, we consider "remove the 481 * first one" semantics to be not preferable. 482 */ 483 if (ia == NULL) 484 return EADDRNOTAVAIL; 485 /* FALLTHROUGH */ 486 case SIOCAIFADDR_IN6: 487 /* 488 * We always require users to specify a valid IPv6 address for 489 * the corresponding operation. 490 */ 491 if (ifra->ifra_addr.sin6_family != AF_INET6 || 492 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) 493 return EAFNOSUPPORT; 494 if (!privileged) 495 return EPERM; 496 497 break; 498 499 case SIOCGIFADDR_IN6: 500 /* This interface is basically deprecated. use SIOCGIFCONF. */ 501 /* FALLTHROUGH */ 502 case SIOCGIFAFLAG_IN6: 503 case SIOCGIFNETMASK_IN6: 504 case SIOCGIFDSTADDR_IN6: 505 case SIOCGIFALIFETIME_IN6: 506 /* must think again about its semantics */ 507 if (ia == NULL) 508 return EADDRNOTAVAIL; 509 break; 510 } 511 512 switch (cmd) { 513 514 case SIOCGIFADDR_IN6: 515 ifr->ifr_addr = ia->ia_addr; 516 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 517 return error; 518 break; 519 520 case SIOCGIFDSTADDR_IN6: 521 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 522 return EINVAL; 523 /* 524 * XXX: should we check if ifa_dstaddr is NULL and return 525 * an error? 526 */ 527 ifr->ifr_dstaddr = ia->ia_dstaddr; 528 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 529 return error; 530 break; 531 532 case SIOCGIFNETMASK_IN6: 533 ifr->ifr_addr = ia->ia_prefixmask; 534 break; 535 536 case SIOCGIFAFLAG_IN6: 537 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 538 break; 539 540 case SIOCGIFSTAT_IN6: 541 if (ifp == NULL) 542 return EINVAL; 543 bzero(&ifr->ifr_ifru.ifru_stat, 544 sizeof(ifr->ifr_ifru.ifru_stat)); 545 ifr->ifr_ifru.ifru_stat = 546 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat; 547 break; 548 549 case SIOCGIFSTAT_ICMP6: 550 if (ifp == NULL) 551 return EINVAL; 552 bzero(&ifr->ifr_ifru.ifru_icmp6stat, 553 sizeof(ifr->ifr_ifru.ifru_icmp6stat)); 554 ifr->ifr_ifru.ifru_icmp6stat = 555 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat; 556 break; 557 558 case SIOCGIFALIFETIME_IN6: 559 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 560 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 561 time_t maxexpire; 562 struct in6_addrlifetime *retlt = 563 &ifr->ifr_ifru.ifru_lifetime; 564 565 /* 566 * XXX: adjust expiration time assuming time_t is 567 * signed. 568 */ 569 maxexpire = ((time_t)~0) & 570 ~((time_t)1 << ((sizeof(maxexpire) * NBBY) - 1)); 571 if (ia->ia6_lifetime.ia6t_vltime < 572 maxexpire - ia->ia6_updatetime) { 573 retlt->ia6t_expire = ia->ia6_updatetime + 574 ia->ia6_lifetime.ia6t_vltime; 575 } else 576 retlt->ia6t_expire = maxexpire; 577 } 578 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 579 time_t maxexpire; 580 struct in6_addrlifetime *retlt = 581 &ifr->ifr_ifru.ifru_lifetime; 582 583 /* 584 * XXX: adjust expiration time assuming time_t is 585 * signed. 586 */ 587 maxexpire = ((time_t)~0) & 588 ~((time_t)1 << ((sizeof(maxexpire) * NBBY) - 1)); 589 if (ia->ia6_lifetime.ia6t_pltime < 590 maxexpire - ia->ia6_updatetime) { 591 retlt->ia6t_preferred = ia->ia6_updatetime + 592 ia->ia6_lifetime.ia6t_pltime; 593 } else 594 retlt->ia6t_preferred = maxexpire; 595 } 596 break; 597 598 case SIOCAIFADDR_IN6: 599 { 600 int i; 601 struct nd_prefixctl pr0; 602 struct nd_prefix *pr; 603 604 /* reject read-only flags */ 605 if ((ifra->ifra_flags & IN6_IFF_DUPLICATED) != 0 || 606 (ifra->ifra_flags & IN6_IFF_DETACHED) != 0 || 607 (ifra->ifra_flags & IN6_IFF_NODAD) != 0 || 608 (ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0) { 609 return EINVAL; 610 } 611 /* 612 * first, make or update the interface address structure, 613 * and link it to the list. 614 */ 615 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 616 return error; 617 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 618 == NULL) { 619 /* 620 * this can happen when the user specify the 0 valid 621 * lifetime. 622 */ 623 break; 624 } 625 626 /* 627 * then, make the prefix on-link on the interface. 628 * XXX: we'd rather create the prefix before the address, but 629 * we need at least one address to install the corresponding 630 * interface route, so we configure the address first. 631 */ 632 633 /* 634 * convert mask to prefix length (prefixmask has already 635 * been validated in in6_update_ifa(). 636 */ 637 bzero(&pr0, sizeof(pr0)); 638 pr0.ndpr_ifp = ifp; 639 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 640 NULL); 641 if (pr0.ndpr_plen == 128) { 642 break; /* we don't need to install a host route. */ 643 } 644 pr0.ndpr_prefix = ifra->ifra_addr; 645 /* apply the mask for safety. */ 646 for (i = 0; i < 4; i++) { 647 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 648 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i]; 649 } 650 /* 651 * XXX: since we don't have an API to set prefix (not address) 652 * lifetimes, we just use the same lifetimes as addresses. 653 * The (temporarily) installed lifetimes can be overridden by 654 * later advertised RAs (when accept_rtadv is non 0), which is 655 * an intended behavior. 656 */ 657 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 658 pr0.ndpr_raf_auto = 659 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 660 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 661 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 662 663 /* add the prefix if not yet. */ 664 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 665 /* 666 * nd6_prelist_add will install the corresponding 667 * interface route. 668 */ 669 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) 670 return error; 671 if (pr == NULL) { 672 log(LOG_ERR, "nd6_prelist_add succeeded but " 673 "no prefix\n"); 674 return EINVAL; /* XXX panic here? */ 675 } 676 } 677 678 /* relate the address to the prefix */ 679 if (ia->ia6_ndpr == NULL) { 680 ia->ia6_ndpr = pr; 681 pr->ndpr_refcnt++; 682 683 /* 684 * If this is the first autoconf address from the 685 * prefix, create a temporary address as well 686 * (when required). 687 */ 688 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 689 ip6_use_tempaddr && pr->ndpr_refcnt == 1) { 690 int e; 691 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 692 log(LOG_NOTICE, "in6_control: failed " 693 "to create a temporary address, " 694 "errno=%d\n", e); 695 } 696 } 697 } 698 699 /* 700 * this might affect the status of autoconfigured addresses, 701 * that is, this address might make other addresses detached. 702 */ 703 pfxlist_onlink_check(); 704 705 #ifdef PFIL_HOOKS 706 (void)pfil_run_hooks(&if_pfil, (struct mbuf **)SIOCAIFADDR_IN6, 707 ifp, PFIL_IFADDR); 708 #endif 709 710 break; 711 } 712 713 case SIOCDIFADDR_IN6: 714 { 715 struct nd_prefix *pr; 716 717 /* 718 * If the address being deleted is the only one that owns 719 * the corresponding prefix, expire the prefix as well. 720 * XXX: theoretically, we don't have to worry about such 721 * relationship, since we separate the address management 722 * and the prefix management. We do this, however, to provide 723 * as much backward compatibility as possible in terms of 724 * the ioctl operation. 725 * Note that in6_purgeaddr() will decrement ndpr_refcnt. 726 */ 727 pr = ia->ia6_ndpr; 728 in6_purgeaddr(&ia->ia_ifa); 729 if (pr && pr->ndpr_refcnt == 0) 730 prelist_remove(pr); 731 #ifdef PFIL_HOOKS 732 (void)pfil_run_hooks(&if_pfil, (struct mbuf **)SIOCDIFADDR_IN6, 733 ifp, PFIL_IFADDR); 734 #endif 735 break; 736 } 737 738 default: 739 return ENOTTY; 740 } 741 742 return 0; 743 } 744 745 int 746 in6_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp, 747 struct lwp *l) 748 { 749 int error, privileged, s; 750 751 privileged = 0; 752 if (l && !kauth_authorize_generic(l->l_cred, 753 KAUTH_GENERIC_ISSUSER, NULL)) 754 privileged++; 755 756 s = splnet(); 757 error = in6_control1(so , cmd, data, ifp, l, privileged); 758 splx(s); 759 return error; 760 } 761 762 /* 763 * Update parameters of an IPv6 interface address. 764 * If necessary, a new entry is created and linked into address chains. 765 * This function is separated from in6_control(). 766 * XXX: should this be performed under splnet()? 767 */ 768 static int 769 in6_update_ifa1(struct ifnet *ifp, struct in6_aliasreq *ifra, 770 struct in6_ifaddr *ia, int flags) 771 { 772 int error = 0, hostIsNew = 0, plen = -1; 773 struct in6_ifaddr *oia; 774 struct sockaddr_in6 dst6; 775 struct in6_addrlifetime *lt; 776 struct in6_multi_mship *imm; 777 struct in6_multi *in6m_sol; 778 struct rtentry *rt; 779 int dad_delay; 780 781 in6m_sol = NULL; 782 783 /* Validate parameters */ 784 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 785 return EINVAL; 786 787 /* 788 * The destination address for a p2p link must have a family 789 * of AF_UNSPEC or AF_INET6. 790 */ 791 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 792 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 793 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 794 return EAFNOSUPPORT; 795 /* 796 * validate ifra_prefixmask. don't check sin6_family, netmask 797 * does not carry fields other than sin6_len. 798 */ 799 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 800 return EINVAL; 801 /* 802 * Because the IPv6 address architecture is classless, we require 803 * users to specify a (non 0) prefix length (mask) for a new address. 804 * We also require the prefix (when specified) mask is valid, and thus 805 * reject a non-consecutive mask. 806 */ 807 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 808 return EINVAL; 809 if (ifra->ifra_prefixmask.sin6_len != 0) { 810 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 811 (u_char *)&ifra->ifra_prefixmask + 812 ifra->ifra_prefixmask.sin6_len); 813 if (plen <= 0) 814 return EINVAL; 815 } else { 816 /* 817 * In this case, ia must not be NULL. We just use its prefix 818 * length. 819 */ 820 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 821 } 822 /* 823 * If the destination address on a p2p interface is specified, 824 * and the address is a scoped one, validate/set the scope 825 * zone identifier. 826 */ 827 dst6 = ifra->ifra_dstaddr; 828 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 829 (dst6.sin6_family == AF_INET6)) { 830 struct in6_addr in6_tmp; 831 u_int32_t zoneid; 832 833 in6_tmp = dst6.sin6_addr; 834 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 835 return EINVAL; /* XXX: should be impossible */ 836 837 if (dst6.sin6_scope_id != 0) { 838 if (dst6.sin6_scope_id != zoneid) 839 return EINVAL; 840 } else /* user omit to specify the ID. */ 841 dst6.sin6_scope_id = zoneid; 842 843 /* convert into the internal form */ 844 if (sa6_embedscope(&dst6, 0)) 845 return EINVAL; /* XXX: should be impossible */ 846 } 847 /* 848 * The destination address can be specified only for a p2p or a 849 * loopback interface. If specified, the corresponding prefix length 850 * must be 128. 851 */ 852 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 853 #ifdef FORCE_P2PPLEN 854 int i; 855 #endif 856 857 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 858 /* XXX: noisy message */ 859 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 860 "be specified for a p2p or a loopback IF only\n")); 861 return EINVAL; 862 } 863 if (plen != 128) { 864 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 865 "be 128 when dstaddr is specified\n")); 866 #ifdef FORCE_P2PPLEN 867 /* 868 * To be compatible with old configurations, 869 * such as ifconfig gif0 inet6 2001::1 2001::2 870 * prefixlen 126, we override the specified 871 * prefixmask as if the prefix length was 128. 872 */ 873 ifra->ifra_prefixmask.sin6_len = 874 sizeof(struct sockaddr_in6); 875 for (i = 0; i < 4; i++) 876 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i] = 877 0xffffffff; 878 plen = 128; 879 #else 880 return EINVAL; 881 #endif 882 } 883 } 884 /* lifetime consistency check */ 885 lt = &ifra->ifra_lifetime; 886 if (lt->ia6t_pltime > lt->ia6t_vltime) 887 return EINVAL; 888 if (lt->ia6t_vltime == 0) { 889 /* 890 * the following log might be noisy, but this is a typical 891 * configuration mistake or a tool's bug. 892 */ 893 nd6log((LOG_INFO, 894 "in6_update_ifa: valid lifetime is 0 for %s\n", 895 ip6_sprintf(&ifra->ifra_addr.sin6_addr))); 896 897 if (ia == NULL) 898 return 0; /* there's nothing to do */ 899 } 900 901 /* 902 * If this is a new address, allocate a new ifaddr and link it 903 * into chains. 904 */ 905 if (ia == NULL) { 906 hostIsNew = 1; 907 /* 908 * When in6_update_ifa() is called in a process of a received 909 * RA, it is called under an interrupt context. So, we should 910 * call malloc with M_NOWAIT. 911 */ 912 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR, 913 M_NOWAIT); 914 if (ia == NULL) 915 return ENOBUFS; 916 bzero((void *)ia, sizeof(*ia)); 917 LIST_INIT(&ia->ia6_memberships); 918 /* Initialize the address and masks, and put time stamp */ 919 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 920 ia->ia_addr.sin6_family = AF_INET6; 921 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 922 ia->ia6_createtime = time_second; 923 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 924 /* 925 * XXX: some functions expect that ifa_dstaddr is not 926 * NULL for p2p interfaces. 927 */ 928 ia->ia_ifa.ifa_dstaddr = 929 (struct sockaddr *)&ia->ia_dstaddr; 930 } else { 931 ia->ia_ifa.ifa_dstaddr = NULL; 932 } 933 ia->ia_ifa.ifa_netmask = 934 (struct sockaddr *)&ia->ia_prefixmask; 935 936 ia->ia_ifp = ifp; 937 if ((oia = in6_ifaddr) != NULL) { 938 for ( ; oia->ia_next; oia = oia->ia_next) 939 continue; 940 oia->ia_next = ia; 941 } else 942 in6_ifaddr = ia; 943 /* gain a refcnt for the link from in6_ifaddr */ 944 IFAREF(&ia->ia_ifa); 945 946 ifa_insert(ifp, &ia->ia_ifa); 947 } 948 949 /* update timestamp */ 950 ia->ia6_updatetime = time_second; 951 952 /* set prefix mask */ 953 if (ifra->ifra_prefixmask.sin6_len) { 954 /* 955 * We prohibit changing the prefix length of an existing 956 * address, because 957 * + such an operation should be rare in IPv6, and 958 * + the operation would confuse prefix management. 959 */ 960 if (ia->ia_prefixmask.sin6_len && 961 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 962 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an" 963 " existing (%s) address should not be changed\n", 964 ip6_sprintf(&ia->ia_addr.sin6_addr))); 965 error = EINVAL; 966 goto unlink; 967 } 968 ia->ia_prefixmask = ifra->ifra_prefixmask; 969 } 970 971 /* 972 * If a new destination address is specified, scrub the old one and 973 * install the new destination. Note that the interface must be 974 * p2p or loopback (see the check above.) 975 */ 976 if (dst6.sin6_family == AF_INET6 && 977 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 978 if ((ia->ia_flags & IFA_ROUTE) != 0 && 979 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0) { 980 nd6log((LOG_ERR, "in6_update_ifa: failed to remove " 981 "a route to the old destination: %s\n", 982 ip6_sprintf(&ia->ia_addr.sin6_addr))); 983 /* proceed anyway... */ 984 } else 985 ia->ia_flags &= ~IFA_ROUTE; 986 ia->ia_dstaddr = dst6; 987 } 988 989 /* 990 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 991 * to see if the address is deprecated or invalidated, but initialize 992 * these members for applications. 993 */ 994 ia->ia6_lifetime = ifra->ifra_lifetime; 995 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 996 ia->ia6_lifetime.ia6t_expire = 997 time_second + ia->ia6_lifetime.ia6t_vltime; 998 } else 999 ia->ia6_lifetime.ia6t_expire = 0; 1000 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1001 ia->ia6_lifetime.ia6t_preferred = 1002 time_second + ia->ia6_lifetime.ia6t_pltime; 1003 } else 1004 ia->ia6_lifetime.ia6t_preferred = 0; 1005 1006 /* reset the interface and routing table appropriately. */ 1007 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 1008 goto unlink; 1009 1010 /* 1011 * configure address flags. 1012 */ 1013 ia->ia6_flags = ifra->ifra_flags; 1014 /* 1015 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1016 * userland, make it deprecated. 1017 */ 1018 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1019 ia->ia6_lifetime.ia6t_pltime = 0; 1020 ia->ia6_lifetime.ia6t_preferred = time_second; 1021 } 1022 1023 /* 1024 * Make the address tentative before joining multicast addresses, 1025 * so that corresponding MLD responses would not have a tentative 1026 * source address. 1027 */ 1028 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1029 if (hostIsNew && in6if_do_dad(ifp)) 1030 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1031 1032 /* 1033 * We are done if we have simply modified an existing address. 1034 */ 1035 if (!hostIsNew) 1036 return error; 1037 1038 /* 1039 * Beyond this point, we should call in6_purgeaddr upon an error, 1040 * not just go to unlink. 1041 */ 1042 1043 /* join necessary multicast groups */ 1044 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1045 struct sockaddr_in6 mltaddr, mltmask; 1046 struct in6_addr llsol; 1047 1048 /* join solicited multicast addr for new host id */ 1049 bzero(&llsol, sizeof(struct in6_addr)); 1050 llsol.s6_addr16[0] = htons(0xff02); 1051 llsol.s6_addr32[1] = 0; 1052 llsol.s6_addr32[2] = htonl(1); 1053 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 1054 llsol.s6_addr8[12] = 0xff; 1055 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) { 1056 /* XXX: should not happen */ 1057 log(LOG_ERR, "in6_update_ifa: " 1058 "in6_setscope failed\n"); 1059 goto cleanup; 1060 } 1061 dad_delay = 0; 1062 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1063 /* 1064 * We need a random delay for DAD on the address 1065 * being configured. It also means delaying 1066 * transmission of the corresponding MLD report to 1067 * avoid report collision. 1068 * [draft-ietf-ipv6-rfc2462bis-02.txt] 1069 */ 1070 dad_delay = arc4random() % 1071 (MAX_RTR_SOLICITATION_DELAY * hz); 1072 } 1073 1074 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */ 1075 /* join solicited multicast addr for new host id */ 1076 imm = in6_joingroup(ifp, &llsol, &error, dad_delay); 1077 if (!imm) { 1078 nd6log((LOG_ERR, 1079 "in6_update_ifa: addmulti " 1080 "failed for %s on %s (errno=%d)\n", 1081 ip6_sprintf(&llsol), if_name(ifp), error)); 1082 goto cleanup; 1083 } 1084 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1085 in6m_sol = imm->i6mm_maddr; 1086 1087 sockaddr_in6_init(&mltmask, &in6mask32, 0, 0, 0); 1088 1089 /* 1090 * join link-local all-nodes address 1091 */ 1092 sockaddr_in6_init(&mltaddr, &in6addr_linklocal_allnodes, 1093 0, 0, 0); 1094 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1095 goto cleanup; /* XXX: should not fail */ 1096 1097 /* 1098 * XXX: do we really need this automatic routes? 1099 * We should probably reconsider this stuff. Most applications 1100 * actually do not need the routes, since they usually specify 1101 * the outgoing interface. 1102 */ 1103 rt = rtalloc1((struct sockaddr *)&mltaddr, 0); 1104 if (rt) { 1105 if (memcmp(&mltaddr.sin6_addr, 1106 &satocsin6(rt_getkey(rt))->sin6_addr, 1107 MLTMASK_LEN)) { 1108 RTFREE(rt); 1109 rt = NULL; 1110 } else if (rt->rt_ifp != ifp) { 1111 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 1112 "network %04x:%04x::/32 = %04x:%04x::/32\n", 1113 __func__, rt->rt_ifp, ifp, ifp->if_xname, 1114 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 1115 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 1116 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 1117 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 1118 rt_replace_ifa(rt, &ia->ia_ifa); 1119 rt->rt_ifp = ifp; 1120 } 1121 } 1122 if (!rt) { 1123 struct rt_addrinfo info; 1124 1125 bzero(&info, sizeof(info)); 1126 info.rti_info[RTAX_DST] = (struct sockaddr *)&mltaddr; 1127 info.rti_info[RTAX_GATEWAY] = 1128 (struct sockaddr *)&ia->ia_addr; 1129 info.rti_info[RTAX_NETMASK] = 1130 (struct sockaddr *)&mltmask; 1131 info.rti_info[RTAX_IFA] = 1132 (struct sockaddr *)&ia->ia_addr; 1133 /* XXX: we need RTF_CLONING to fake nd6_rtrequest */ 1134 info.rti_flags = RTF_UP | RTF_CLONING; 1135 error = rtrequest1(RTM_ADD, &info, NULL); 1136 if (error) 1137 goto cleanup; 1138 } else { 1139 RTFREE(rt); 1140 } 1141 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1142 if (!imm) { 1143 nd6log((LOG_WARNING, 1144 "in6_update_ifa: addmulti failed for " 1145 "%s on %s (errno=%d)\n", 1146 ip6_sprintf(&mltaddr.sin6_addr), 1147 if_name(ifp), error)); 1148 goto cleanup; 1149 } 1150 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1151 1152 /* 1153 * join node information group address 1154 */ 1155 dad_delay = 0; 1156 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1157 /* 1158 * The spec doesn't say anything about delay for this 1159 * group, but the same logic should apply. 1160 */ 1161 dad_delay = arc4random() % 1162 (MAX_RTR_SOLICITATION_DELAY * hz); 1163 } 1164 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr) != 0) 1165 ; 1166 else if ((imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 1167 dad_delay)) == NULL) { /* XXX jinmei */ 1168 nd6log((LOG_WARNING, "in6_update_ifa: " 1169 "addmulti failed for %s on %s (errno=%d)\n", 1170 ip6_sprintf(&mltaddr.sin6_addr), 1171 if_name(ifp), error)); 1172 /* XXX not very fatal, go on... */ 1173 } else { 1174 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1175 } 1176 1177 1178 /* 1179 * join interface-local all-nodes address. 1180 * (ff01::1%ifN, and ff01::%ifN/32) 1181 */ 1182 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1183 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1184 goto cleanup; /* XXX: should not fail */ 1185 1186 /* XXX: again, do we really need the route? */ 1187 rt = rtalloc1((struct sockaddr *)&mltaddr, 0); 1188 if (rt) { 1189 /* 32bit came from "mltmask" */ 1190 if (memcmp(&mltaddr.sin6_addr, 1191 &satocsin6(rt_getkey(rt))->sin6_addr, 1192 32 / NBBY)) { 1193 RTFREE(rt); 1194 rt = NULL; 1195 } else if (rt->rt_ifp != ifp) { 1196 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 1197 "network %04x:%04x::/32 = %04x:%04x::/32\n", 1198 __func__, rt->rt_ifp, ifp, ifp->if_xname, 1199 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 1200 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 1201 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 1202 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 1203 rt_replace_ifa(rt, &ia->ia_ifa); 1204 rt->rt_ifp = ifp; 1205 } 1206 } 1207 if (!rt) { 1208 struct rt_addrinfo info; 1209 1210 bzero(&info, sizeof(info)); 1211 info.rti_info[RTAX_DST] = (struct sockaddr *)&mltaddr; 1212 info.rti_info[RTAX_GATEWAY] = 1213 (struct sockaddr *)&ia->ia_addr; 1214 info.rti_info[RTAX_NETMASK] = 1215 (struct sockaddr *)&mltmask; 1216 info.rti_info[RTAX_IFA] = 1217 (struct sockaddr *)&ia->ia_addr; 1218 info.rti_flags = RTF_UP | RTF_CLONING; 1219 error = rtrequest1(RTM_ADD, &info, NULL); 1220 if (error) 1221 goto cleanup; 1222 #undef MLTMASK_LEN 1223 } else { 1224 RTFREE(rt); 1225 } 1226 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1227 if (!imm) { 1228 nd6log((LOG_WARNING, "in6_update_ifa: " 1229 "addmulti failed for %s on %s (errno=%d)\n", 1230 ip6_sprintf(&mltaddr.sin6_addr), 1231 if_name(ifp), error)); 1232 goto cleanup; 1233 } else { 1234 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1235 } 1236 } 1237 1238 /* 1239 * Perform DAD, if needed. 1240 * XXX It may be of use, if we can administratively 1241 * disable DAD. 1242 */ 1243 if (hostIsNew && in6if_do_dad(ifp) && 1244 ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && 1245 (ia->ia6_flags & IN6_IFF_TENTATIVE)) 1246 { 1247 int mindelay, maxdelay; 1248 1249 dad_delay = 0; 1250 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1251 /* 1252 * We need to impose a delay before sending an NS 1253 * for DAD. Check if we also needed a delay for the 1254 * corresponding MLD message. If we did, the delay 1255 * should be larger than the MLD delay (this could be 1256 * relaxed a bit, but this simple logic is at least 1257 * safe). 1258 */ 1259 mindelay = 0; 1260 if (in6m_sol != NULL && 1261 in6m_sol->in6m_state == MLD_REPORTPENDING) { 1262 mindelay = in6m_sol->in6m_timer; 1263 } 1264 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1265 if (maxdelay - mindelay == 0) 1266 dad_delay = 0; 1267 else { 1268 dad_delay = 1269 (arc4random() % (maxdelay - mindelay)) + 1270 mindelay; 1271 } 1272 } 1273 nd6_dad_start((struct ifaddr *)ia, dad_delay); 1274 } 1275 1276 return error; 1277 1278 unlink: 1279 /* 1280 * XXX: if a change of an existing address failed, keep the entry 1281 * anyway. 1282 */ 1283 if (hostIsNew) 1284 in6_unlink_ifa(ia, ifp); 1285 return error; 1286 1287 cleanup: 1288 in6_purgeaddr(&ia->ia_ifa); 1289 return error; 1290 } 1291 1292 int 1293 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1294 struct in6_ifaddr *ia, int flags) 1295 { 1296 int rc, s; 1297 1298 s = splnet(); 1299 rc = in6_update_ifa1(ifp, ifra, ia, flags); 1300 splx(s); 1301 return rc; 1302 } 1303 1304 void 1305 in6_purgeaddr(struct ifaddr *ifa) 1306 { 1307 struct ifnet *ifp = ifa->ifa_ifp; 1308 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1309 struct in6_multi_mship *imm; 1310 1311 /* stop DAD processing */ 1312 nd6_dad_stop(ifa); 1313 1314 /* 1315 * delete route to the destination of the address being purged. 1316 * The interface must be p2p or loopback in this case. 1317 */ 1318 if ((ia->ia_flags & IFA_ROUTE) != 0 && ia->ia_dstaddr.sin6_len != 0) { 1319 int e; 1320 1321 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 1322 != 0) { 1323 log(LOG_ERR, "in6_purgeaddr: failed to remove " 1324 "a route to the p2p destination: %s on %s, " 1325 "errno=%d\n", 1326 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp), 1327 e); 1328 /* proceed anyway... */ 1329 } else 1330 ia->ia_flags &= ~IFA_ROUTE; 1331 } 1332 1333 /* Remove ownaddr's loopback rtentry, if it exists. */ 1334 in6_ifremloop(&(ia->ia_ifa)); 1335 1336 /* 1337 * leave from multicast groups we have joined for the interface 1338 */ 1339 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1340 LIST_REMOVE(imm, i6mm_chain); 1341 in6_leavegroup(imm); 1342 } 1343 1344 in6_unlink_ifa(ia, ifp); 1345 } 1346 1347 static void 1348 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1349 { 1350 struct in6_ifaddr *oia; 1351 int s = splnet(); 1352 1353 ifa_remove(ifp, &ia->ia_ifa); 1354 1355 oia = ia; 1356 if (oia == (ia = in6_ifaddr)) 1357 in6_ifaddr = ia->ia_next; 1358 else { 1359 while (ia->ia_next && (ia->ia_next != oia)) 1360 ia = ia->ia_next; 1361 if (ia->ia_next) 1362 ia->ia_next = oia->ia_next; 1363 else { 1364 /* search failed */ 1365 printf("Couldn't unlink in6_ifaddr from in6_ifaddr\n"); 1366 } 1367 } 1368 1369 /* 1370 * XXX thorpej@NetBSD.org -- if the interface is going 1371 * XXX away, don't save the multicast entries, delete them! 1372 */ 1373 if (LIST_EMPTY(&oia->ia6_multiaddrs)) 1374 ; 1375 else if (oia->ia_ifa.ifa_ifp->if_output == if_nulloutput) { 1376 struct in6_multi *in6m, *next; 1377 1378 for (in6m = LIST_FIRST(&oia->ia6_multiaddrs); in6m != NULL; 1379 in6m = next) { 1380 next = LIST_NEXT(in6m, in6m_entry); 1381 in6_delmulti(in6m); 1382 } 1383 } else 1384 in6_savemkludge(oia); 1385 1386 /* 1387 * Release the reference to the base prefix. There should be a 1388 * positive reference. 1389 */ 1390 if (oia->ia6_ndpr == NULL) { 1391 nd6log((LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address " 1392 "%p has no prefix\n", oia)); 1393 } else { 1394 oia->ia6_ndpr->ndpr_refcnt--; 1395 oia->ia6_ndpr = NULL; 1396 } 1397 1398 /* 1399 * Also, if the address being removed is autoconf'ed, call 1400 * pfxlist_onlink_check() since the release might affect the status of 1401 * other (detached) addresses. 1402 */ 1403 if ((oia->ia6_flags & IN6_IFF_AUTOCONF) != 0) 1404 pfxlist_onlink_check(); 1405 1406 /* 1407 * release another refcnt for the link from in6_ifaddr. 1408 * Note that we should decrement the refcnt at least once for all *BSD. 1409 */ 1410 IFAFREE(&oia->ia_ifa); 1411 1412 splx(s); 1413 } 1414 1415 void 1416 in6_purgeif(struct ifnet *ifp) 1417 { 1418 if_purgeaddrs(ifp, AF_INET6, in6_purgeaddr); 1419 1420 in6_ifdetach(ifp); 1421 } 1422 1423 /* 1424 * SIOC[GAD]LIFADDR. 1425 * SIOCGLIFADDR: get first address. (?) 1426 * SIOCGLIFADDR with IFLR_PREFIX: 1427 * get first address that matches the specified prefix. 1428 * SIOCALIFADDR: add the specified address. 1429 * SIOCALIFADDR with IFLR_PREFIX: 1430 * add the specified prefix, filling hostid part from 1431 * the first link-local address. prefixlen must be <= 64. 1432 * SIOCDLIFADDR: delete the specified address. 1433 * SIOCDLIFADDR with IFLR_PREFIX: 1434 * delete the first address that matches the specified prefix. 1435 * return values: 1436 * EINVAL on invalid parameters 1437 * EADDRNOTAVAIL on prefix match failed/specified address not found 1438 * other values may be returned from in6_ioctl() 1439 * 1440 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1441 * this is to accommodate address naming scheme other than RFC2374, 1442 * in the future. 1443 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1444 * address encoding scheme. (see figure on page 8) 1445 */ 1446 static int 1447 in6_lifaddr_ioctl(struct socket *so, u_long cmd, void *data, 1448 struct ifnet *ifp, struct lwp *l) 1449 { 1450 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1451 struct ifaddr *ifa; 1452 struct sockaddr *sa; 1453 1454 /* sanity checks */ 1455 if (!data || !ifp) { 1456 panic("invalid argument to in6_lifaddr_ioctl"); 1457 /* NOTREACHED */ 1458 } 1459 1460 switch (cmd) { 1461 case SIOCGLIFADDR: 1462 /* address must be specified on GET with IFLR_PREFIX */ 1463 if ((iflr->flags & IFLR_PREFIX) == 0) 1464 break; 1465 /* FALLTHROUGH */ 1466 case SIOCALIFADDR: 1467 case SIOCDLIFADDR: 1468 /* address must be specified on ADD and DELETE */ 1469 sa = (struct sockaddr *)&iflr->addr; 1470 if (sa->sa_family != AF_INET6) 1471 return EINVAL; 1472 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1473 return EINVAL; 1474 /* XXX need improvement */ 1475 sa = (struct sockaddr *)&iflr->dstaddr; 1476 if (sa->sa_family && sa->sa_family != AF_INET6) 1477 return EINVAL; 1478 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1479 return EINVAL; 1480 break; 1481 default: /* shouldn't happen */ 1482 #if 0 1483 panic("invalid cmd to in6_lifaddr_ioctl"); 1484 /* NOTREACHED */ 1485 #else 1486 return EOPNOTSUPP; 1487 #endif 1488 } 1489 if (sizeof(struct in6_addr) * NBBY < iflr->prefixlen) 1490 return EINVAL; 1491 1492 switch (cmd) { 1493 case SIOCALIFADDR: 1494 { 1495 struct in6_aliasreq ifra; 1496 struct in6_addr *xhostid = NULL; 1497 int prefixlen; 1498 1499 if ((iflr->flags & IFLR_PREFIX) != 0) { 1500 struct sockaddr_in6 *sin6; 1501 1502 /* 1503 * xhostid is to fill in the hostid part of the 1504 * address. xhostid points to the first link-local 1505 * address attached to the interface. 1506 */ 1507 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1508 if (!ifa) 1509 return EADDRNOTAVAIL; 1510 xhostid = IFA_IN6(ifa); 1511 1512 /* prefixlen must be <= 64. */ 1513 if (64 < iflr->prefixlen) 1514 return EINVAL; 1515 prefixlen = iflr->prefixlen; 1516 1517 /* hostid part must be zero. */ 1518 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1519 if (sin6->sin6_addr.s6_addr32[2] != 0 1520 || sin6->sin6_addr.s6_addr32[3] != 0) { 1521 return EINVAL; 1522 } 1523 } else 1524 prefixlen = iflr->prefixlen; 1525 1526 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1527 bzero(&ifra, sizeof(ifra)); 1528 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name)); 1529 1530 bcopy(&iflr->addr, &ifra.ifra_addr, 1531 ((struct sockaddr *)&iflr->addr)->sa_len); 1532 if (xhostid) { 1533 /* fill in hostid part */ 1534 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1535 xhostid->s6_addr32[2]; 1536 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1537 xhostid->s6_addr32[3]; 1538 } 1539 1540 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1541 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1542 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1543 if (xhostid) { 1544 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1545 xhostid->s6_addr32[2]; 1546 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1547 xhostid->s6_addr32[3]; 1548 } 1549 } 1550 1551 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1552 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1553 1554 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 1555 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 1556 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1557 return in6_control(so, SIOCAIFADDR_IN6, (void *)&ifra, ifp, l); 1558 } 1559 case SIOCGLIFADDR: 1560 case SIOCDLIFADDR: 1561 { 1562 struct in6_ifaddr *ia; 1563 struct in6_addr mask, candidate, match; 1564 struct sockaddr_in6 *sin6; 1565 int cmp; 1566 1567 bzero(&mask, sizeof(mask)); 1568 if (iflr->flags & IFLR_PREFIX) { 1569 /* lookup a prefix rather than address. */ 1570 in6_prefixlen2mask(&mask, iflr->prefixlen); 1571 1572 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1573 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1574 match.s6_addr32[0] &= mask.s6_addr32[0]; 1575 match.s6_addr32[1] &= mask.s6_addr32[1]; 1576 match.s6_addr32[2] &= mask.s6_addr32[2]; 1577 match.s6_addr32[3] &= mask.s6_addr32[3]; 1578 1579 /* if you set extra bits, that's wrong */ 1580 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1581 return EINVAL; 1582 1583 cmp = 1; 1584 } else { 1585 if (cmd == SIOCGLIFADDR) { 1586 /* on getting an address, take the 1st match */ 1587 cmp = 0; /* XXX */ 1588 } else { 1589 /* on deleting an address, do exact match */ 1590 in6_prefixlen2mask(&mask, 128); 1591 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1592 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1593 1594 cmp = 1; 1595 } 1596 } 1597 1598 IFADDR_FOREACH(ifa, ifp) { 1599 if (ifa->ifa_addr->sa_family != AF_INET6) 1600 continue; 1601 if (!cmp) 1602 break; 1603 1604 /* 1605 * XXX: this is adhoc, but is necessary to allow 1606 * a user to specify fe80::/64 (not /10) for a 1607 * link-local address. 1608 */ 1609 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1610 in6_clearscope(&candidate); 1611 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1612 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1613 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1614 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1615 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1616 break; 1617 } 1618 if (!ifa) 1619 return EADDRNOTAVAIL; 1620 ia = ifa2ia6(ifa); 1621 1622 if (cmd == SIOCGLIFADDR) { 1623 int error; 1624 1625 /* fill in the if_laddrreq structure */ 1626 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1627 error = sa6_recoverscope( 1628 (struct sockaddr_in6 *)&iflr->addr); 1629 if (error != 0) 1630 return error; 1631 1632 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1633 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1634 ia->ia_dstaddr.sin6_len); 1635 error = sa6_recoverscope( 1636 (struct sockaddr_in6 *)&iflr->dstaddr); 1637 if (error != 0) 1638 return error; 1639 } else 1640 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1641 1642 iflr->prefixlen = 1643 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1644 1645 iflr->flags = ia->ia6_flags; /* XXX */ 1646 1647 return 0; 1648 } else { 1649 struct in6_aliasreq ifra; 1650 1651 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1652 bzero(&ifra, sizeof(ifra)); 1653 bcopy(iflr->iflr_name, ifra.ifra_name, 1654 sizeof(ifra.ifra_name)); 1655 1656 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1657 ia->ia_addr.sin6_len); 1658 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1659 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1660 ia->ia_dstaddr.sin6_len); 1661 } else { 1662 bzero(&ifra.ifra_dstaddr, 1663 sizeof(ifra.ifra_dstaddr)); 1664 } 1665 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1666 ia->ia_prefixmask.sin6_len); 1667 1668 ifra.ifra_flags = ia->ia6_flags; 1669 return in6_control(so, SIOCDIFADDR_IN6, (void *)&ifra, 1670 ifp, l); 1671 } 1672 } 1673 } 1674 1675 return EOPNOTSUPP; /* just for safety */ 1676 } 1677 1678 /* 1679 * Initialize an interface's internet6 address 1680 * and routing table entry. 1681 */ 1682 static int 1683 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1684 struct sockaddr_in6 *sin6, int newhost) 1685 { 1686 int error = 0, plen, ifacount = 0; 1687 int s = splnet(); 1688 struct ifaddr *ifa; 1689 1690 /* 1691 * Give the interface a chance to initialize 1692 * if this is its first address, 1693 * and to validate the address if necessary. 1694 */ 1695 IFADDR_FOREACH(ifa, ifp) { 1696 if (ifa->ifa_addr == NULL) 1697 continue; /* just for safety */ 1698 if (ifa->ifa_addr->sa_family != AF_INET6) 1699 continue; 1700 ifacount++; 1701 } 1702 1703 ia->ia_addr = *sin6; 1704 1705 if (ifacount <= 1 && 1706 (error = (*ifp->if_ioctl)(ifp, SIOCINITIFADDR, ia)) != 0) { 1707 splx(s); 1708 return error; 1709 } 1710 splx(s); 1711 1712 ia->ia_ifa.ifa_metric = ifp->if_metric; 1713 1714 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1715 1716 /* 1717 * Special case: 1718 * If the destination address is specified for a point-to-point 1719 * interface, install a route to the destination as an interface 1720 * direct route. 1721 */ 1722 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1723 if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) { 1724 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, 1725 RTF_UP | RTF_HOST)) != 0) 1726 return error; 1727 ia->ia_flags |= IFA_ROUTE; 1728 } 1729 1730 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1731 if (newhost) { 1732 /* set the rtrequest function to create llinfo */ 1733 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1734 in6_ifaddloop(&(ia->ia_ifa)); 1735 } 1736 1737 if (ifp->if_flags & IFF_MULTICAST) 1738 in6_restoremkludge(ia, ifp); 1739 1740 return error; 1741 } 1742 1743 /* 1744 * Find an IPv6 interface link-local address specific to an interface. 1745 */ 1746 struct in6_ifaddr * 1747 in6ifa_ifpforlinklocal(const struct ifnet *ifp, const int ignoreflags) 1748 { 1749 struct ifaddr *ifa; 1750 1751 IFADDR_FOREACH(ifa, ifp) { 1752 if (ifa->ifa_addr == NULL) 1753 continue; /* just for safety */ 1754 if (ifa->ifa_addr->sa_family != AF_INET6) 1755 continue; 1756 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1757 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1758 ignoreflags) != 0) 1759 continue; 1760 break; 1761 } 1762 } 1763 1764 return (struct in6_ifaddr *)ifa; 1765 } 1766 1767 1768 /* 1769 * find the internet address corresponding to a given interface and address. 1770 */ 1771 struct in6_ifaddr * 1772 in6ifa_ifpwithaddr(const struct ifnet *ifp, const struct in6_addr *addr) 1773 { 1774 struct ifaddr *ifa; 1775 1776 IFADDR_FOREACH(ifa, ifp) { 1777 if (ifa->ifa_addr == NULL) 1778 continue; /* just for safety */ 1779 if (ifa->ifa_addr->sa_family != AF_INET6) 1780 continue; 1781 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1782 break; 1783 } 1784 1785 return (struct in6_ifaddr *)ifa; 1786 } 1787 1788 /* 1789 * find the internet address on a given interface corresponding to a neighbor's 1790 * address. 1791 */ 1792 struct in6_ifaddr * 1793 in6ifa_ifplocaladdr(const struct ifnet *ifp, const struct in6_addr *addr) 1794 { 1795 struct ifaddr *ifa; 1796 struct in6_ifaddr *ia; 1797 1798 IFADDR_FOREACH(ifa, ifp) { 1799 if (ifa->ifa_addr == NULL) 1800 continue; /* just for safety */ 1801 if (ifa->ifa_addr->sa_family != AF_INET6) 1802 continue; 1803 ia = (struct in6_ifaddr *)ifa; 1804 if (IN6_ARE_MASKED_ADDR_EQUAL(addr, 1805 &ia->ia_addr.sin6_addr, 1806 &ia->ia_prefixmask.sin6_addr)) 1807 return ia; 1808 } 1809 1810 return NULL; 1811 } 1812 1813 /* 1814 * Convert IP6 address to printable (loggable) representation. 1815 */ 1816 static int ip6round = 0; 1817 char * 1818 ip6_sprintf(const struct in6_addr *addr) 1819 { 1820 static char ip6buf[8][48]; 1821 int i; 1822 char *cp; 1823 const u_int16_t *a = (const u_int16_t *)addr; 1824 const u_int8_t *d; 1825 int dcolon = 0; 1826 1827 ip6round = (ip6round + 1) & 7; 1828 cp = ip6buf[ip6round]; 1829 1830 for (i = 0; i < 8; i++) { 1831 if (dcolon == 1) { 1832 if (*a == 0) { 1833 if (i == 7) 1834 *cp++ = ':'; 1835 a++; 1836 continue; 1837 } else 1838 dcolon = 2; 1839 } 1840 if (*a == 0) { 1841 if (dcolon == 0 && *(a + 1) == 0) { 1842 if (i == 0) 1843 *cp++ = ':'; 1844 *cp++ = ':'; 1845 dcolon = 1; 1846 } else { 1847 *cp++ = '0'; 1848 *cp++ = ':'; 1849 } 1850 a++; 1851 continue; 1852 } 1853 d = (const u_char *)a; 1854 *cp++ = hexdigits[*d >> 4]; 1855 *cp++ = hexdigits[*d++ & 0xf]; 1856 *cp++ = hexdigits[*d >> 4]; 1857 *cp++ = hexdigits[*d & 0xf]; 1858 *cp++ = ':'; 1859 a++; 1860 } 1861 *--cp = 0; 1862 return ip6buf[ip6round]; 1863 } 1864 1865 /* 1866 * Determine if an address is on a local network. 1867 */ 1868 int 1869 in6_localaddr(const struct in6_addr *in6) 1870 { 1871 struct in6_ifaddr *ia; 1872 1873 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1874 return 1; 1875 1876 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 1877 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1878 &ia->ia_prefixmask.sin6_addr)) 1879 return 1; 1880 1881 return 0; 1882 } 1883 1884 int 1885 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1886 { 1887 struct in6_ifaddr *ia; 1888 1889 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1890 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1891 &sa6->sin6_addr) && 1892 #ifdef SCOPEDROUTING 1893 ia->ia_addr.sin6_scope_id == sa6->sin6_scope_id && 1894 #endif 1895 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) 1896 return 1; /* true */ 1897 1898 /* XXX: do we still have to go thru the rest of the list? */ 1899 } 1900 1901 return 0; /* false */ 1902 } 1903 1904 /* 1905 * return length of part which dst and src are equal 1906 * hard coding... 1907 */ 1908 int 1909 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1910 { 1911 int match = 0; 1912 u_char *s = (u_char *)src, *d = (u_char *)dst; 1913 u_char *lim = s + 16, r; 1914 1915 while (s < lim) 1916 if ((r = (*d++ ^ *s++)) != 0) { 1917 while (r < 128) { 1918 match++; 1919 r <<= 1; 1920 } 1921 break; 1922 } else 1923 match += NBBY; 1924 return match; 1925 } 1926 1927 /* XXX: to be scope conscious */ 1928 int 1929 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1930 { 1931 int bytelen, bitlen; 1932 1933 /* sanity check */ 1934 if (len < 0 || len > 128) { 1935 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1936 len); 1937 return 0; 1938 } 1939 1940 bytelen = len / NBBY; 1941 bitlen = len % NBBY; 1942 1943 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1944 return 0; 1945 if (bitlen != 0 && 1946 p1->s6_addr[bytelen] >> (NBBY - bitlen) != 1947 p2->s6_addr[bytelen] >> (NBBY - bitlen)) 1948 return 0; 1949 1950 return 1; 1951 } 1952 1953 void 1954 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1955 { 1956 static const u_char maskarray[NBBY] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1957 int bytelen, bitlen, i; 1958 1959 /* sanity check */ 1960 if (len < 0 || len > 128) { 1961 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1962 len); 1963 return; 1964 } 1965 1966 bzero(maskp, sizeof(*maskp)); 1967 bytelen = len / NBBY; 1968 bitlen = len % NBBY; 1969 for (i = 0; i < bytelen; i++) 1970 maskp->s6_addr[i] = 0xff; 1971 if (bitlen) 1972 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1973 } 1974 1975 /* 1976 * return the best address out of the same scope. if no address was 1977 * found, return the first valid address from designated IF. 1978 */ 1979 struct in6_ifaddr * 1980 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 1981 { 1982 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 1983 struct ifaddr *ifa; 1984 struct in6_ifaddr *besta = 0; 1985 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 1986 1987 dep[0] = dep[1] = NULL; 1988 1989 /* 1990 * We first look for addresses in the same scope. 1991 * If there is one, return it. 1992 * If two or more, return one which matches the dst longest. 1993 * If none, return one of global addresses assigned other ifs. 1994 */ 1995 IFADDR_FOREACH(ifa, ifp) { 1996 if (ifa->ifa_addr->sa_family != AF_INET6) 1997 continue; 1998 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1999 continue; /* XXX: is there any case to allow anycast? */ 2000 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2001 continue; /* don't use this interface */ 2002 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2003 continue; 2004 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2005 if (ip6_use_deprecated) 2006 dep[0] = (struct in6_ifaddr *)ifa; 2007 continue; 2008 } 2009 2010 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2011 /* 2012 * call in6_matchlen() as few as possible 2013 */ 2014 if (besta) { 2015 if (blen == -1) 2016 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2017 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2018 if (tlen > blen) { 2019 blen = tlen; 2020 besta = (struct in6_ifaddr *)ifa; 2021 } 2022 } else 2023 besta = (struct in6_ifaddr *)ifa; 2024 } 2025 } 2026 if (besta) 2027 return besta; 2028 2029 IFADDR_FOREACH(ifa, ifp) { 2030 if (ifa->ifa_addr->sa_family != AF_INET6) 2031 continue; 2032 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2033 continue; /* XXX: is there any case to allow anycast? */ 2034 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2035 continue; /* don't use this interface */ 2036 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2037 continue; 2038 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2039 if (ip6_use_deprecated) 2040 dep[1] = (struct in6_ifaddr *)ifa; 2041 continue; 2042 } 2043 2044 return (struct in6_ifaddr *)ifa; 2045 } 2046 2047 /* use the last-resort values, that are, deprecated addresses */ 2048 if (dep[0]) 2049 return dep[0]; 2050 if (dep[1]) 2051 return dep[1]; 2052 2053 return NULL; 2054 } 2055 2056 /* 2057 * perform DAD when interface becomes IFF_UP. 2058 */ 2059 void 2060 in6_if_up(struct ifnet *ifp) 2061 { 2062 struct ifaddr *ifa; 2063 struct in6_ifaddr *ia; 2064 2065 IFADDR_FOREACH(ifa, ifp) { 2066 if (ifa->ifa_addr->sa_family != AF_INET6) 2067 continue; 2068 ia = (struct in6_ifaddr *)ifa; 2069 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2070 /* 2071 * The TENTATIVE flag was likely set by hand 2072 * beforehand, implicitly indicating the need for DAD. 2073 * We may be able to skip the random delay in this 2074 * case, but we impose delays just in case. 2075 */ 2076 nd6_dad_start(ifa, 2077 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 2078 } 2079 } 2080 2081 /* 2082 * special cases, like 6to4, are handled in in6_ifattach 2083 */ 2084 in6_ifattach(ifp, NULL); 2085 } 2086 2087 int 2088 in6if_do_dad(struct ifnet *ifp) 2089 { 2090 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 2091 return 0; 2092 2093 switch (ifp->if_type) { 2094 case IFT_FAITH: 2095 /* 2096 * These interfaces do not have the IFF_LOOPBACK flag, 2097 * but loop packets back. We do not have to do DAD on such 2098 * interfaces. We should even omit it, because loop-backed 2099 * NS would confuse the DAD procedure. 2100 */ 2101 return 0; 2102 default: 2103 /* 2104 * Our DAD routine requires the interface up and running. 2105 * However, some interfaces can be up before the RUNNING 2106 * status. Additionaly, users may try to assign addresses 2107 * before the interface becomes up (or running). 2108 * We simply skip DAD in such a case as a work around. 2109 * XXX: we should rather mark "tentative" on such addresses, 2110 * and do DAD after the interface becomes ready. 2111 */ 2112 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != 2113 (IFF_UP|IFF_RUNNING)) 2114 return 0; 2115 2116 return 1; 2117 } 2118 } 2119 2120 /* 2121 * Calculate max IPv6 MTU through all the interfaces and store it 2122 * to in6_maxmtu. 2123 */ 2124 void 2125 in6_setmaxmtu(void) 2126 { 2127 unsigned long maxmtu = 0; 2128 struct ifnet *ifp; 2129 2130 TAILQ_FOREACH(ifp, &ifnet, if_list) { 2131 /* this function can be called during ifnet initialization */ 2132 if (!ifp->if_afdata[AF_INET6]) 2133 continue; 2134 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2135 IN6_LINKMTU(ifp) > maxmtu) 2136 maxmtu = IN6_LINKMTU(ifp); 2137 } 2138 if (maxmtu) /* update only when maxmtu is positive */ 2139 in6_maxmtu = maxmtu; 2140 } 2141 2142 /* 2143 * Provide the length of interface identifiers to be used for the link attached 2144 * to the given interface. The length should be defined in "IPv6 over 2145 * xxx-link" document. Note that address architecture might also define 2146 * the length for a particular set of address prefixes, regardless of the 2147 * link type. As clarified in rfc2462bis, those two definitions should be 2148 * consistent, and those really are as of August 2004. 2149 */ 2150 int 2151 in6_if2idlen(struct ifnet *ifp) 2152 { 2153 switch (ifp->if_type) { 2154 case IFT_ETHER: /* RFC2464 */ 2155 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2156 case IFT_L2VLAN: /* ditto */ 2157 case IFT_IEEE80211: /* ditto */ 2158 case IFT_FDDI: /* RFC2467 */ 2159 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 2160 case IFT_PPP: /* RFC2472 */ 2161 case IFT_ARCNET: /* RFC2497 */ 2162 case IFT_FRELAY: /* RFC2590 */ 2163 case IFT_IEEE1394: /* RFC3146 */ 2164 case IFT_GIF: /* draft-ietf-v6ops-mech-v2-07 */ 2165 case IFT_LOOP: /* XXX: is this really correct? */ 2166 return 64; 2167 default: 2168 /* 2169 * Unknown link type: 2170 * It might be controversial to use the today's common constant 2171 * of 64 for these cases unconditionally. For full compliance, 2172 * we should return an error in this case. On the other hand, 2173 * if we simply miss the standard for the link type or a new 2174 * standard is defined for a new link type, the IFID length 2175 * is very likely to be the common constant. As a compromise, 2176 * we always use the constant, but make an explicit notice 2177 * indicating the "unknown" case. 2178 */ 2179 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2180 return 64; 2181 } 2182 } 2183 2184 void * 2185 in6_domifattach(struct ifnet *ifp) 2186 { 2187 struct in6_ifextra *ext; 2188 2189 ext = malloc(sizeof(*ext), M_IFADDR, M_WAITOK|M_ZERO); 2190 2191 ext->in6_ifstat = malloc(sizeof(struct in6_ifstat), 2192 M_IFADDR, M_WAITOK|M_ZERO); 2193 2194 ext->icmp6_ifstat = malloc(sizeof(struct icmp6_ifstat), 2195 M_IFADDR, M_WAITOK|M_ZERO); 2196 2197 ext->nd_ifinfo = nd6_ifattach(ifp); 2198 ext->scope6_id = scope6_ifattach(ifp); 2199 return ext; 2200 } 2201 2202 void 2203 in6_domifdetach(struct ifnet *ifp, void *aux) 2204 { 2205 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2206 2207 nd6_ifdetach(ext->nd_ifinfo); 2208 free(ext->in6_ifstat, M_IFADDR); 2209 free(ext->icmp6_ifstat, M_IFADDR); 2210 scope6_ifdetach(ext->scope6_id); 2211 free(ext, M_IFADDR); 2212 } 2213 2214 /* 2215 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2216 * v4 mapped addr or v4 compat addr 2217 */ 2218 void 2219 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2220 { 2221 bzero(sin, sizeof(*sin)); 2222 sin->sin_len = sizeof(struct sockaddr_in); 2223 sin->sin_family = AF_INET; 2224 sin->sin_port = sin6->sin6_port; 2225 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2226 } 2227 2228 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2229 void 2230 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2231 { 2232 bzero(sin6, sizeof(*sin6)); 2233 sin6->sin6_len = sizeof(struct sockaddr_in6); 2234 sin6->sin6_family = AF_INET6; 2235 sin6->sin6_port = sin->sin_port; 2236 sin6->sin6_addr.s6_addr32[0] = 0; 2237 sin6->sin6_addr.s6_addr32[1] = 0; 2238 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2239 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2240 } 2241 2242 /* Convert sockaddr_in6 into sockaddr_in. */ 2243 void 2244 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2245 { 2246 struct sockaddr_in *sin_p; 2247 struct sockaddr_in6 sin6; 2248 2249 /* 2250 * Save original sockaddr_in6 addr and convert it 2251 * to sockaddr_in. 2252 */ 2253 sin6 = *(struct sockaddr_in6 *)nam; 2254 sin_p = (struct sockaddr_in *)nam; 2255 in6_sin6_2_sin(sin_p, &sin6); 2256 } 2257 2258 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2259 void 2260 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2261 { 2262 struct sockaddr_in *sin_p; 2263 struct sockaddr_in6 *sin6_p; 2264 2265 sin6_p = malloc(sizeof(*sin6_p), M_SONAME, M_WAITOK); 2266 sin_p = (struct sockaddr_in *)*nam; 2267 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2268 free(*nam, M_SONAME); 2269 *nam = (struct sockaddr *)sin6_p; 2270 } 2271