1 /* $NetBSD: in6.c,v 1.135 2007/11/10 00:05:57 dyoung 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 1.135 2007/11/10 00:05:57 dyoung 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 if (ifp == NULL || ifp->if_ioctl == 0) 740 return EOPNOTSUPP; 741 error = ((*ifp->if_ioctl)(ifp, cmd, data)); 742 return error; 743 } 744 745 return 0; 746 } 747 748 int 749 in6_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp, 750 struct lwp *l) 751 { 752 int error, privileged, s; 753 754 privileged = 0; 755 if (l && !kauth_authorize_generic(l->l_cred, 756 KAUTH_GENERIC_ISSUSER, NULL)) 757 privileged++; 758 759 s = splnet(); 760 error = in6_control1(so , cmd, data, ifp, l, privileged); 761 splx(s); 762 return error; 763 } 764 765 /* 766 * Update parameters of an IPv6 interface address. 767 * If necessary, a new entry is created and linked into address chains. 768 * This function is separated from in6_control(). 769 * XXX: should this be performed under splnet()? 770 */ 771 static int 772 in6_update_ifa1(struct ifnet *ifp, struct in6_aliasreq *ifra, 773 struct in6_ifaddr *ia, int flags) 774 { 775 int error = 0, hostIsNew = 0, plen = -1; 776 struct in6_ifaddr *oia; 777 struct sockaddr_in6 dst6; 778 struct in6_addrlifetime *lt; 779 struct in6_multi_mship *imm; 780 struct in6_multi *in6m_sol; 781 struct rtentry *rt; 782 int dad_delay; 783 784 in6m_sol = NULL; 785 786 /* Validate parameters */ 787 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 788 return EINVAL; 789 790 /* 791 * The destination address for a p2p link must have a family 792 * of AF_UNSPEC or AF_INET6. 793 */ 794 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 795 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 796 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 797 return EAFNOSUPPORT; 798 /* 799 * validate ifra_prefixmask. don't check sin6_family, netmask 800 * does not carry fields other than sin6_len. 801 */ 802 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 803 return EINVAL; 804 /* 805 * Because the IPv6 address architecture is classless, we require 806 * users to specify a (non 0) prefix length (mask) for a new address. 807 * We also require the prefix (when specified) mask is valid, and thus 808 * reject a non-consecutive mask. 809 */ 810 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 811 return EINVAL; 812 if (ifra->ifra_prefixmask.sin6_len != 0) { 813 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 814 (u_char *)&ifra->ifra_prefixmask + 815 ifra->ifra_prefixmask.sin6_len); 816 if (plen <= 0) 817 return EINVAL; 818 } else { 819 /* 820 * In this case, ia must not be NULL. We just use its prefix 821 * length. 822 */ 823 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 824 } 825 /* 826 * If the destination address on a p2p interface is specified, 827 * and the address is a scoped one, validate/set the scope 828 * zone identifier. 829 */ 830 dst6 = ifra->ifra_dstaddr; 831 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 832 (dst6.sin6_family == AF_INET6)) { 833 struct in6_addr in6_tmp; 834 u_int32_t zoneid; 835 836 in6_tmp = dst6.sin6_addr; 837 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 838 return EINVAL; /* XXX: should be impossible */ 839 840 if (dst6.sin6_scope_id != 0) { 841 if (dst6.sin6_scope_id != zoneid) 842 return EINVAL; 843 } else /* user omit to specify the ID. */ 844 dst6.sin6_scope_id = zoneid; 845 846 /* convert into the internal form */ 847 if (sa6_embedscope(&dst6, 0)) 848 return EINVAL; /* XXX: should be impossible */ 849 } 850 /* 851 * The destination address can be specified only for a p2p or a 852 * loopback interface. If specified, the corresponding prefix length 853 * must be 128. 854 */ 855 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 856 #ifdef FORCE_P2PPLEN 857 int i; 858 #endif 859 860 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 861 /* XXX: noisy message */ 862 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 863 "be specified for a p2p or a loopback IF only\n")); 864 return EINVAL; 865 } 866 if (plen != 128) { 867 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 868 "be 128 when dstaddr is specified\n")); 869 #ifdef FORCE_P2PPLEN 870 /* 871 * To be compatible with old configurations, 872 * such as ifconfig gif0 inet6 2001::1 2001::2 873 * prefixlen 126, we override the specified 874 * prefixmask as if the prefix length was 128. 875 */ 876 ifra->ifra_prefixmask.sin6_len = 877 sizeof(struct sockaddr_in6); 878 for (i = 0; i < 4; i++) 879 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i] = 880 0xffffffff; 881 plen = 128; 882 #else 883 return EINVAL; 884 #endif 885 } 886 } 887 /* lifetime consistency check */ 888 lt = &ifra->ifra_lifetime; 889 if (lt->ia6t_pltime > lt->ia6t_vltime) 890 return EINVAL; 891 if (lt->ia6t_vltime == 0) { 892 /* 893 * the following log might be noisy, but this is a typical 894 * configuration mistake or a tool's bug. 895 */ 896 nd6log((LOG_INFO, 897 "in6_update_ifa: valid lifetime is 0 for %s\n", 898 ip6_sprintf(&ifra->ifra_addr.sin6_addr))); 899 900 if (ia == NULL) 901 return 0; /* there's nothing to do */ 902 } 903 904 /* 905 * If this is a new address, allocate a new ifaddr and link it 906 * into chains. 907 */ 908 if (ia == NULL) { 909 hostIsNew = 1; 910 /* 911 * When in6_update_ifa() is called in a process of a received 912 * RA, it is called under an interrupt context. So, we should 913 * call malloc with M_NOWAIT. 914 */ 915 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR, 916 M_NOWAIT); 917 if (ia == NULL) 918 return ENOBUFS; 919 bzero((void *)ia, sizeof(*ia)); 920 LIST_INIT(&ia->ia6_memberships); 921 /* Initialize the address and masks, and put time stamp */ 922 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 923 ia->ia_addr.sin6_family = AF_INET6; 924 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 925 ia->ia6_createtime = time_second; 926 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 927 /* 928 * XXX: some functions expect that ifa_dstaddr is not 929 * NULL for p2p interfaces. 930 */ 931 ia->ia_ifa.ifa_dstaddr = 932 (struct sockaddr *)&ia->ia_dstaddr; 933 } else { 934 ia->ia_ifa.ifa_dstaddr = NULL; 935 } 936 ia->ia_ifa.ifa_netmask = 937 (struct sockaddr *)&ia->ia_prefixmask; 938 939 ia->ia_ifp = ifp; 940 if ((oia = in6_ifaddr) != NULL) { 941 for ( ; oia->ia_next; oia = oia->ia_next) 942 continue; 943 oia->ia_next = ia; 944 } else 945 in6_ifaddr = ia; 946 /* gain a refcnt for the link from in6_ifaddr */ 947 IFAREF(&ia->ia_ifa); 948 949 TAILQ_INSERT_TAIL(&ifp->if_addrlist, &ia->ia_ifa, ifa_list); 950 /* gain another refcnt for the link from if_addrlist */ 951 IFAREF(&ia->ia_ifa); 952 } 953 954 /* update timestamp */ 955 ia->ia6_updatetime = time_second; 956 957 /* set prefix mask */ 958 if (ifra->ifra_prefixmask.sin6_len) { 959 /* 960 * We prohibit changing the prefix length of an existing 961 * address, because 962 * + such an operation should be rare in IPv6, and 963 * + the operation would confuse prefix management. 964 */ 965 if (ia->ia_prefixmask.sin6_len && 966 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 967 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an" 968 " existing (%s) address should not be changed\n", 969 ip6_sprintf(&ia->ia_addr.sin6_addr))); 970 error = EINVAL; 971 goto unlink; 972 } 973 ia->ia_prefixmask = ifra->ifra_prefixmask; 974 } 975 976 /* 977 * If a new destination address is specified, scrub the old one and 978 * install the new destination. Note that the interface must be 979 * p2p or loopback (see the check above.) 980 */ 981 if (dst6.sin6_family == AF_INET6 && 982 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 983 if ((ia->ia_flags & IFA_ROUTE) != 0 && 984 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0) { 985 nd6log((LOG_ERR, "in6_update_ifa: failed to remove " 986 "a route to the old destination: %s\n", 987 ip6_sprintf(&ia->ia_addr.sin6_addr))); 988 /* proceed anyway... */ 989 } else 990 ia->ia_flags &= ~IFA_ROUTE; 991 ia->ia_dstaddr = dst6; 992 } 993 994 /* 995 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 996 * to see if the address is deprecated or invalidated, but initialize 997 * these members for applications. 998 */ 999 ia->ia6_lifetime = ifra->ifra_lifetime; 1000 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1001 ia->ia6_lifetime.ia6t_expire = 1002 time_second + ia->ia6_lifetime.ia6t_vltime; 1003 } else 1004 ia->ia6_lifetime.ia6t_expire = 0; 1005 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1006 ia->ia6_lifetime.ia6t_preferred = 1007 time_second + ia->ia6_lifetime.ia6t_pltime; 1008 } else 1009 ia->ia6_lifetime.ia6t_preferred = 0; 1010 1011 /* reset the interface and routing table appropriately. */ 1012 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 1013 goto unlink; 1014 1015 /* 1016 * configure address flags. 1017 */ 1018 ia->ia6_flags = ifra->ifra_flags; 1019 /* 1020 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1021 * userland, make it deprecated. 1022 */ 1023 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1024 ia->ia6_lifetime.ia6t_pltime = 0; 1025 ia->ia6_lifetime.ia6t_preferred = time_second; 1026 } 1027 1028 /* 1029 * Make the address tentative before joining multicast addresses, 1030 * so that corresponding MLD responses would not have a tentative 1031 * source address. 1032 */ 1033 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1034 if (hostIsNew && in6if_do_dad(ifp)) 1035 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1036 1037 /* 1038 * We are done if we have simply modified an existing address. 1039 */ 1040 if (!hostIsNew) 1041 return error; 1042 1043 /* 1044 * Beyond this point, we should call in6_purgeaddr upon an error, 1045 * not just go to unlink. 1046 */ 1047 1048 /* join necessary multicast groups */ 1049 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1050 struct sockaddr_in6 mltaddr, mltmask; 1051 struct in6_addr llsol; 1052 1053 /* join solicited multicast addr for new host id */ 1054 bzero(&llsol, sizeof(struct in6_addr)); 1055 llsol.s6_addr16[0] = htons(0xff02); 1056 llsol.s6_addr32[1] = 0; 1057 llsol.s6_addr32[2] = htonl(1); 1058 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 1059 llsol.s6_addr8[12] = 0xff; 1060 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) { 1061 /* XXX: should not happen */ 1062 log(LOG_ERR, "in6_update_ifa: " 1063 "in6_setscope failed\n"); 1064 goto cleanup; 1065 } 1066 dad_delay = 0; 1067 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1068 /* 1069 * We need a random delay for DAD on the address 1070 * being configured. It also means delaying 1071 * transmission of the corresponding MLD report to 1072 * avoid report collision. 1073 * [draft-ietf-ipv6-rfc2462bis-02.txt] 1074 */ 1075 dad_delay = arc4random() % 1076 (MAX_RTR_SOLICITATION_DELAY * hz); 1077 } 1078 1079 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */ 1080 /* join solicited multicast addr for new host id */ 1081 imm = in6_joingroup(ifp, &llsol, &error, dad_delay); 1082 if (!imm) { 1083 nd6log((LOG_ERR, 1084 "in6_update_ifa: addmulti " 1085 "failed for %s on %s (errno=%d)\n", 1086 ip6_sprintf(&llsol), if_name(ifp), error)); 1087 goto cleanup; 1088 } 1089 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1090 in6m_sol = imm->i6mm_maddr; 1091 1092 sockaddr_in6_init(&mltmask, &in6mask32, 0, 0, 0); 1093 1094 /* 1095 * join link-local all-nodes address 1096 */ 1097 sockaddr_in6_init(&mltaddr, &in6addr_linklocal_allnodes, 1098 0, 0, 0); 1099 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1100 goto cleanup; /* XXX: should not fail */ 1101 1102 /* 1103 * XXX: do we really need this automatic routes? 1104 * We should probably reconsider this stuff. Most applications 1105 * actually do not need the routes, since they usually specify 1106 * the outgoing interface. 1107 */ 1108 rt = rtalloc1((struct sockaddr *)&mltaddr, 0); 1109 if (rt) { 1110 if (memcmp(&mltaddr.sin6_addr, 1111 &satocsin6(rt_getkey(rt))->sin6_addr, 1112 MLTMASK_LEN)) { 1113 RTFREE(rt); 1114 rt = NULL; 1115 } else if (rt->rt_ifp != ifp) { 1116 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 1117 "network %04x:%04x::/32 = %04x:%04x::/32\n", 1118 __func__, rt->rt_ifp, ifp, ifp->if_xname, 1119 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 1120 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 1121 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 1122 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 1123 rt_replace_ifa(rt, &ia->ia_ifa); 1124 rt->rt_ifp = ifp; 1125 } 1126 } 1127 if (!rt) { 1128 struct rt_addrinfo info; 1129 1130 bzero(&info, sizeof(info)); 1131 info.rti_info[RTAX_DST] = (struct sockaddr *)&mltaddr; 1132 info.rti_info[RTAX_GATEWAY] = 1133 (struct sockaddr *)&ia->ia_addr; 1134 info.rti_info[RTAX_NETMASK] = 1135 (struct sockaddr *)&mltmask; 1136 info.rti_info[RTAX_IFA] = 1137 (struct sockaddr *)&ia->ia_addr; 1138 /* XXX: we need RTF_CLONING to fake nd6_rtrequest */ 1139 info.rti_flags = RTF_UP | RTF_CLONING; 1140 error = rtrequest1(RTM_ADD, &info, NULL); 1141 if (error) 1142 goto cleanup; 1143 } else { 1144 RTFREE(rt); 1145 } 1146 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1147 if (!imm) { 1148 nd6log((LOG_WARNING, 1149 "in6_update_ifa: addmulti failed for " 1150 "%s on %s (errno=%d)\n", 1151 ip6_sprintf(&mltaddr.sin6_addr), 1152 if_name(ifp), error)); 1153 goto cleanup; 1154 } 1155 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1156 1157 /* 1158 * join node information group address 1159 */ 1160 dad_delay = 0; 1161 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1162 /* 1163 * The spec doesn't say anything about delay for this 1164 * group, but the same logic should apply. 1165 */ 1166 dad_delay = arc4random() % 1167 (MAX_RTR_SOLICITATION_DELAY * hz); 1168 } 1169 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr) != 0) 1170 ; 1171 else if ((imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 1172 dad_delay)) == NULL) { /* XXX jinmei */ 1173 nd6log((LOG_WARNING, "in6_update_ifa: " 1174 "addmulti failed for %s on %s (errno=%d)\n", 1175 ip6_sprintf(&mltaddr.sin6_addr), 1176 if_name(ifp), error)); 1177 /* XXX not very fatal, go on... */ 1178 } else { 1179 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1180 } 1181 1182 1183 /* 1184 * join interface-local all-nodes address. 1185 * (ff01::1%ifN, and ff01::%ifN/32) 1186 */ 1187 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1188 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1189 goto cleanup; /* XXX: should not fail */ 1190 1191 /* XXX: again, do we really need the route? */ 1192 rt = rtalloc1((struct sockaddr *)&mltaddr, 0); 1193 if (rt) { 1194 /* 32bit came from "mltmask" */ 1195 if (memcmp(&mltaddr.sin6_addr, 1196 &satocsin6(rt_getkey(rt))->sin6_addr, 1197 32 / NBBY)) { 1198 RTFREE(rt); 1199 rt = NULL; 1200 } else if (rt->rt_ifp != ifp) { 1201 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 1202 "network %04x:%04x::/32 = %04x:%04x::/32\n", 1203 __func__, rt->rt_ifp, ifp, ifp->if_xname, 1204 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 1205 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 1206 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 1207 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 1208 rt_replace_ifa(rt, &ia->ia_ifa); 1209 rt->rt_ifp = ifp; 1210 } 1211 } 1212 if (!rt) { 1213 struct rt_addrinfo info; 1214 1215 bzero(&info, sizeof(info)); 1216 info.rti_info[RTAX_DST] = (struct sockaddr *)&mltaddr; 1217 info.rti_info[RTAX_GATEWAY] = 1218 (struct sockaddr *)&ia->ia_addr; 1219 info.rti_info[RTAX_NETMASK] = 1220 (struct sockaddr *)&mltmask; 1221 info.rti_info[RTAX_IFA] = 1222 (struct sockaddr *)&ia->ia_addr; 1223 info.rti_flags = RTF_UP | RTF_CLONING; 1224 error = rtrequest1(RTM_ADD, &info, NULL); 1225 if (error) 1226 goto cleanup; 1227 #undef MLTMASK_LEN 1228 } else { 1229 RTFREE(rt); 1230 } 1231 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1232 if (!imm) { 1233 nd6log((LOG_WARNING, "in6_update_ifa: " 1234 "addmulti failed for %s on %s (errno=%d)\n", 1235 ip6_sprintf(&mltaddr.sin6_addr), 1236 if_name(ifp), error)); 1237 goto cleanup; 1238 } else { 1239 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1240 } 1241 } 1242 1243 /* 1244 * Perform DAD, if needed. 1245 * XXX It may be of use, if we can administratively 1246 * disable DAD. 1247 */ 1248 if (hostIsNew && in6if_do_dad(ifp) && 1249 ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && 1250 (ia->ia6_flags & IN6_IFF_TENTATIVE)) 1251 { 1252 int mindelay, maxdelay; 1253 1254 dad_delay = 0; 1255 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1256 /* 1257 * We need to impose a delay before sending an NS 1258 * for DAD. Check if we also needed a delay for the 1259 * corresponding MLD message. If we did, the delay 1260 * should be larger than the MLD delay (this could be 1261 * relaxed a bit, but this simple logic is at least 1262 * safe). 1263 */ 1264 mindelay = 0; 1265 if (in6m_sol != NULL && 1266 in6m_sol->in6m_state == MLD_REPORTPENDING) { 1267 mindelay = in6m_sol->in6m_timer; 1268 } 1269 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1270 if (maxdelay - mindelay == 0) 1271 dad_delay = 0; 1272 else { 1273 dad_delay = 1274 (arc4random() % (maxdelay - mindelay)) + 1275 mindelay; 1276 } 1277 } 1278 nd6_dad_start((struct ifaddr *)ia, dad_delay); 1279 } 1280 1281 return error; 1282 1283 unlink: 1284 /* 1285 * XXX: if a change of an existing address failed, keep the entry 1286 * anyway. 1287 */ 1288 if (hostIsNew) 1289 in6_unlink_ifa(ia, ifp); 1290 return error; 1291 1292 cleanup: 1293 in6_purgeaddr(&ia->ia_ifa); 1294 return error; 1295 } 1296 1297 int 1298 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1299 struct in6_ifaddr *ia, int flags) 1300 { 1301 int rc, s; 1302 1303 s = splnet(); 1304 rc = in6_update_ifa1(ifp, ifra, ia, flags); 1305 splx(s); 1306 return rc; 1307 } 1308 1309 void 1310 in6_purgeaddr(struct ifaddr *ifa) 1311 { 1312 struct ifnet *ifp = ifa->ifa_ifp; 1313 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1314 struct in6_multi_mship *imm; 1315 1316 /* stop DAD processing */ 1317 nd6_dad_stop(ifa); 1318 1319 /* 1320 * delete route to the destination of the address being purged. 1321 * The interface must be p2p or loopback in this case. 1322 */ 1323 if ((ia->ia_flags & IFA_ROUTE) != 0 && ia->ia_dstaddr.sin6_len != 0) { 1324 int e; 1325 1326 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 1327 != 0) { 1328 log(LOG_ERR, "in6_purgeaddr: failed to remove " 1329 "a route to the p2p destination: %s on %s, " 1330 "errno=%d\n", 1331 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp), 1332 e); 1333 /* proceed anyway... */ 1334 } else 1335 ia->ia_flags &= ~IFA_ROUTE; 1336 } 1337 1338 /* Remove ownaddr's loopback rtentry, if it exists. */ 1339 in6_ifremloop(&(ia->ia_ifa)); 1340 1341 /* 1342 * leave from multicast groups we have joined for the interface 1343 */ 1344 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1345 LIST_REMOVE(imm, i6mm_chain); 1346 in6_leavegroup(imm); 1347 } 1348 1349 in6_unlink_ifa(ia, ifp); 1350 } 1351 1352 static void 1353 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1354 { 1355 struct in6_ifaddr *oia; 1356 int s = splnet(); 1357 1358 TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list); 1359 /* release a refcnt for the link from if_addrlist */ 1360 IFAFREE(&ia->ia_ifa); 1361 1362 oia = ia; 1363 if (oia == (ia = in6_ifaddr)) 1364 in6_ifaddr = ia->ia_next; 1365 else { 1366 while (ia->ia_next && (ia->ia_next != oia)) 1367 ia = ia->ia_next; 1368 if (ia->ia_next) 1369 ia->ia_next = oia->ia_next; 1370 else { 1371 /* search failed */ 1372 printf("Couldn't unlink in6_ifaddr from in6_ifaddr\n"); 1373 } 1374 } 1375 1376 /* 1377 * XXX thorpej@NetBSD.org -- if the interface is going 1378 * XXX away, don't save the multicast entries, delete them! 1379 */ 1380 if (LIST_EMPTY(&oia->ia6_multiaddrs)) 1381 ; 1382 else if (oia->ia_ifa.ifa_ifp->if_output == if_nulloutput) { 1383 struct in6_multi *in6m, *next; 1384 1385 for (in6m = LIST_FIRST(&oia->ia6_multiaddrs); in6m != NULL; 1386 in6m = next) { 1387 next = LIST_NEXT(in6m, in6m_entry); 1388 in6_delmulti(in6m); 1389 } 1390 } else 1391 in6_savemkludge(oia); 1392 1393 /* 1394 * Release the reference to the base prefix. There should be a 1395 * positive reference. 1396 */ 1397 if (oia->ia6_ndpr == NULL) { 1398 nd6log((LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address " 1399 "%p has no prefix\n", oia)); 1400 } else { 1401 oia->ia6_ndpr->ndpr_refcnt--; 1402 oia->ia6_ndpr = NULL; 1403 } 1404 1405 /* 1406 * Also, if the address being removed is autoconf'ed, call 1407 * pfxlist_onlink_check() since the release might affect the status of 1408 * other (detached) addresses. 1409 */ 1410 if ((oia->ia6_flags & IN6_IFF_AUTOCONF) != 0) 1411 pfxlist_onlink_check(); 1412 1413 /* 1414 * release another refcnt for the link from in6_ifaddr. 1415 * Note that we should decrement the refcnt at least once for all *BSD. 1416 */ 1417 IFAFREE(&oia->ia_ifa); 1418 1419 splx(s); 1420 } 1421 1422 void 1423 in6_purgeif(struct ifnet *ifp) 1424 { 1425 struct ifaddr *ifa, *nifa; 1426 1427 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa) { 1428 nifa = TAILQ_NEXT(ifa, ifa_list); 1429 if (ifa->ifa_addr->sa_family != AF_INET6) 1430 continue; 1431 in6_purgeaddr(ifa); 1432 } 1433 1434 in6_ifdetach(ifp); 1435 } 1436 1437 /* 1438 * SIOC[GAD]LIFADDR. 1439 * SIOCGLIFADDR: get first address. (?) 1440 * SIOCGLIFADDR with IFLR_PREFIX: 1441 * get first address that matches the specified prefix. 1442 * SIOCALIFADDR: add the specified address. 1443 * SIOCALIFADDR with IFLR_PREFIX: 1444 * add the specified prefix, filling hostid part from 1445 * the first link-local address. prefixlen must be <= 64. 1446 * SIOCDLIFADDR: delete the specified address. 1447 * SIOCDLIFADDR with IFLR_PREFIX: 1448 * delete the first address that matches the specified prefix. 1449 * return values: 1450 * EINVAL on invalid parameters 1451 * EADDRNOTAVAIL on prefix match failed/specified address not found 1452 * other values may be returned from in6_ioctl() 1453 * 1454 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1455 * this is to accommodate address naming scheme other than RFC2374, 1456 * in the future. 1457 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1458 * address encoding scheme. (see figure on page 8) 1459 */ 1460 static int 1461 in6_lifaddr_ioctl(struct socket *so, u_long cmd, void *data, 1462 struct ifnet *ifp, struct lwp *l) 1463 { 1464 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1465 struct ifaddr *ifa; 1466 struct sockaddr *sa; 1467 1468 /* sanity checks */ 1469 if (!data || !ifp) { 1470 panic("invalid argument to in6_lifaddr_ioctl"); 1471 /* NOTREACHED */ 1472 } 1473 1474 switch (cmd) { 1475 case SIOCGLIFADDR: 1476 /* address must be specified on GET with IFLR_PREFIX */ 1477 if ((iflr->flags & IFLR_PREFIX) == 0) 1478 break; 1479 /* FALLTHROUGH */ 1480 case SIOCALIFADDR: 1481 case SIOCDLIFADDR: 1482 /* address must be specified on ADD and DELETE */ 1483 sa = (struct sockaddr *)&iflr->addr; 1484 if (sa->sa_family != AF_INET6) 1485 return EINVAL; 1486 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1487 return EINVAL; 1488 /* XXX need improvement */ 1489 sa = (struct sockaddr *)&iflr->dstaddr; 1490 if (sa->sa_family && sa->sa_family != AF_INET6) 1491 return EINVAL; 1492 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1493 return EINVAL; 1494 break; 1495 default: /* shouldn't happen */ 1496 #if 0 1497 panic("invalid cmd to in6_lifaddr_ioctl"); 1498 /* NOTREACHED */ 1499 #else 1500 return EOPNOTSUPP; 1501 #endif 1502 } 1503 if (sizeof(struct in6_addr) * NBBY < iflr->prefixlen) 1504 return EINVAL; 1505 1506 switch (cmd) { 1507 case SIOCALIFADDR: 1508 { 1509 struct in6_aliasreq ifra; 1510 struct in6_addr *xhostid = NULL; 1511 int prefixlen; 1512 1513 if ((iflr->flags & IFLR_PREFIX) != 0) { 1514 struct sockaddr_in6 *sin6; 1515 1516 /* 1517 * xhostid is to fill in the hostid part of the 1518 * address. xhostid points to the first link-local 1519 * address attached to the interface. 1520 */ 1521 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1522 if (!ifa) 1523 return EADDRNOTAVAIL; 1524 xhostid = IFA_IN6(ifa); 1525 1526 /* prefixlen must be <= 64. */ 1527 if (64 < iflr->prefixlen) 1528 return EINVAL; 1529 prefixlen = iflr->prefixlen; 1530 1531 /* hostid part must be zero. */ 1532 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1533 if (sin6->sin6_addr.s6_addr32[2] != 0 1534 || sin6->sin6_addr.s6_addr32[3] != 0) { 1535 return EINVAL; 1536 } 1537 } else 1538 prefixlen = iflr->prefixlen; 1539 1540 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1541 bzero(&ifra, sizeof(ifra)); 1542 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name)); 1543 1544 bcopy(&iflr->addr, &ifra.ifra_addr, 1545 ((struct sockaddr *)&iflr->addr)->sa_len); 1546 if (xhostid) { 1547 /* fill in hostid part */ 1548 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1549 xhostid->s6_addr32[2]; 1550 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1551 xhostid->s6_addr32[3]; 1552 } 1553 1554 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1555 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1556 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1557 if (xhostid) { 1558 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1559 xhostid->s6_addr32[2]; 1560 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1561 xhostid->s6_addr32[3]; 1562 } 1563 } 1564 1565 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1566 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1567 1568 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 1569 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 1570 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1571 return in6_control(so, SIOCAIFADDR_IN6, (void *)&ifra, ifp, l); 1572 } 1573 case SIOCGLIFADDR: 1574 case SIOCDLIFADDR: 1575 { 1576 struct in6_ifaddr *ia; 1577 struct in6_addr mask, candidate, match; 1578 struct sockaddr_in6 *sin6; 1579 int cmp; 1580 1581 bzero(&mask, sizeof(mask)); 1582 if (iflr->flags & IFLR_PREFIX) { 1583 /* lookup a prefix rather than address. */ 1584 in6_prefixlen2mask(&mask, iflr->prefixlen); 1585 1586 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1587 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1588 match.s6_addr32[0] &= mask.s6_addr32[0]; 1589 match.s6_addr32[1] &= mask.s6_addr32[1]; 1590 match.s6_addr32[2] &= mask.s6_addr32[2]; 1591 match.s6_addr32[3] &= mask.s6_addr32[3]; 1592 1593 /* if you set extra bits, that's wrong */ 1594 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1595 return EINVAL; 1596 1597 cmp = 1; 1598 } else { 1599 if (cmd == SIOCGLIFADDR) { 1600 /* on getting an address, take the 1st match */ 1601 cmp = 0; /* XXX */ 1602 } else { 1603 /* on deleting an address, do exact match */ 1604 in6_prefixlen2mask(&mask, 128); 1605 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1606 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1607 1608 cmp = 1; 1609 } 1610 } 1611 1612 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1613 if (ifa->ifa_addr->sa_family != AF_INET6) 1614 continue; 1615 if (!cmp) 1616 break; 1617 1618 /* 1619 * XXX: this is adhoc, but is necessary to allow 1620 * a user to specify fe80::/64 (not /10) for a 1621 * link-local address. 1622 */ 1623 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1624 in6_clearscope(&candidate); 1625 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1626 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1627 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1628 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1629 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1630 break; 1631 } 1632 if (!ifa) 1633 return EADDRNOTAVAIL; 1634 ia = ifa2ia6(ifa); 1635 1636 if (cmd == SIOCGLIFADDR) { 1637 int error; 1638 1639 /* fill in the if_laddrreq structure */ 1640 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1641 error = sa6_recoverscope( 1642 (struct sockaddr_in6 *)&iflr->addr); 1643 if (error != 0) 1644 return error; 1645 1646 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1647 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1648 ia->ia_dstaddr.sin6_len); 1649 error = sa6_recoverscope( 1650 (struct sockaddr_in6 *)&iflr->dstaddr); 1651 if (error != 0) 1652 return error; 1653 } else 1654 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1655 1656 iflr->prefixlen = 1657 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1658 1659 iflr->flags = ia->ia6_flags; /* XXX */ 1660 1661 return 0; 1662 } else { 1663 struct in6_aliasreq ifra; 1664 1665 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1666 bzero(&ifra, sizeof(ifra)); 1667 bcopy(iflr->iflr_name, ifra.ifra_name, 1668 sizeof(ifra.ifra_name)); 1669 1670 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1671 ia->ia_addr.sin6_len); 1672 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1673 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1674 ia->ia_dstaddr.sin6_len); 1675 } else { 1676 bzero(&ifra.ifra_dstaddr, 1677 sizeof(ifra.ifra_dstaddr)); 1678 } 1679 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1680 ia->ia_prefixmask.sin6_len); 1681 1682 ifra.ifra_flags = ia->ia6_flags; 1683 return in6_control(so, SIOCDIFADDR_IN6, (void *)&ifra, 1684 ifp, l); 1685 } 1686 } 1687 } 1688 1689 return EOPNOTSUPP; /* just for safety */ 1690 } 1691 1692 /* 1693 * Initialize an interface's internet6 address 1694 * and routing table entry. 1695 */ 1696 static int 1697 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1698 struct sockaddr_in6 *sin6, int newhost) 1699 { 1700 int error = 0, plen, ifacount = 0; 1701 int s = splnet(); 1702 struct ifaddr *ifa; 1703 1704 /* 1705 * Give the interface a chance to initialize 1706 * if this is its first address, 1707 * and to validate the address if necessary. 1708 */ 1709 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1710 if (ifa->ifa_addr == NULL) 1711 continue; /* just for safety */ 1712 if (ifa->ifa_addr->sa_family != AF_INET6) 1713 continue; 1714 ifacount++; 1715 } 1716 1717 ia->ia_addr = *sin6; 1718 1719 if (ifacount <= 1 && ifp->if_ioctl && 1720 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (void *)ia))) { 1721 splx(s); 1722 return error; 1723 } 1724 splx(s); 1725 1726 ia->ia_ifa.ifa_metric = ifp->if_metric; 1727 1728 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1729 1730 /* 1731 * Special case: 1732 * If the destination address is specified for a point-to-point 1733 * interface, install a route to the destination as an interface 1734 * direct route. 1735 */ 1736 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1737 if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) { 1738 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, 1739 RTF_UP | RTF_HOST)) != 0) 1740 return error; 1741 ia->ia_flags |= IFA_ROUTE; 1742 } 1743 1744 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1745 if (newhost) { 1746 /* set the rtrequest function to create llinfo */ 1747 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1748 in6_ifaddloop(&(ia->ia_ifa)); 1749 } 1750 1751 if (ifp->if_flags & IFF_MULTICAST) 1752 in6_restoremkludge(ia, ifp); 1753 1754 return error; 1755 } 1756 1757 /* 1758 * Find an IPv6 interface link-local address specific to an interface. 1759 */ 1760 struct in6_ifaddr * 1761 in6ifa_ifpforlinklocal(const struct ifnet *ifp, const int ignoreflags) 1762 { 1763 struct ifaddr *ifa; 1764 1765 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1766 if (ifa->ifa_addr == NULL) 1767 continue; /* just for safety */ 1768 if (ifa->ifa_addr->sa_family != AF_INET6) 1769 continue; 1770 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1771 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1772 ignoreflags) != 0) 1773 continue; 1774 break; 1775 } 1776 } 1777 1778 return (struct in6_ifaddr *)ifa; 1779 } 1780 1781 1782 /* 1783 * find the internet address corresponding to a given interface and address. 1784 */ 1785 struct in6_ifaddr * 1786 in6ifa_ifpwithaddr(const struct ifnet *ifp, const struct in6_addr *addr) 1787 { 1788 struct ifaddr *ifa; 1789 1790 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1791 if (ifa->ifa_addr == NULL) 1792 continue; /* just for safety */ 1793 if (ifa->ifa_addr->sa_family != AF_INET6) 1794 continue; 1795 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1796 break; 1797 } 1798 1799 return (struct in6_ifaddr *)ifa; 1800 } 1801 1802 /* 1803 * Convert IP6 address to printable (loggable) representation. 1804 */ 1805 static int ip6round = 0; 1806 char * 1807 ip6_sprintf(const struct in6_addr *addr) 1808 { 1809 static char ip6buf[8][48]; 1810 int i; 1811 char *cp; 1812 const u_int16_t *a = (const u_int16_t *)addr; 1813 const u_int8_t *d; 1814 int dcolon = 0; 1815 1816 ip6round = (ip6round + 1) & 7; 1817 cp = ip6buf[ip6round]; 1818 1819 for (i = 0; i < 8; i++) { 1820 if (dcolon == 1) { 1821 if (*a == 0) { 1822 if (i == 7) 1823 *cp++ = ':'; 1824 a++; 1825 continue; 1826 } else 1827 dcolon = 2; 1828 } 1829 if (*a == 0) { 1830 if (dcolon == 0 && *(a + 1) == 0) { 1831 if (i == 0) 1832 *cp++ = ':'; 1833 *cp++ = ':'; 1834 dcolon = 1; 1835 } else { 1836 *cp++ = '0'; 1837 *cp++ = ':'; 1838 } 1839 a++; 1840 continue; 1841 } 1842 d = (const u_char *)a; 1843 *cp++ = hexdigits[*d >> 4]; 1844 *cp++ = hexdigits[*d++ & 0xf]; 1845 *cp++ = hexdigits[*d >> 4]; 1846 *cp++ = hexdigits[*d & 0xf]; 1847 *cp++ = ':'; 1848 a++; 1849 } 1850 *--cp = 0; 1851 return ip6buf[ip6round]; 1852 } 1853 1854 /* 1855 * Determine if an address is on a local network. 1856 */ 1857 int 1858 in6_localaddr(const struct in6_addr *in6) 1859 { 1860 struct in6_ifaddr *ia; 1861 1862 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1863 return 1; 1864 1865 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 1866 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1867 &ia->ia_prefixmask.sin6_addr)) 1868 return 1; 1869 1870 return 0; 1871 } 1872 1873 int 1874 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1875 { 1876 struct in6_ifaddr *ia; 1877 1878 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1879 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1880 &sa6->sin6_addr) && 1881 #ifdef SCOPEDROUTING 1882 ia->ia_addr.sin6_scope_id == sa6->sin6_scope_id && 1883 #endif 1884 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) 1885 return 1; /* true */ 1886 1887 /* XXX: do we still have to go thru the rest of the list? */ 1888 } 1889 1890 return 0; /* false */ 1891 } 1892 1893 /* 1894 * return length of part which dst and src are equal 1895 * hard coding... 1896 */ 1897 int 1898 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1899 { 1900 int match = 0; 1901 u_char *s = (u_char *)src, *d = (u_char *)dst; 1902 u_char *lim = s + 16, r; 1903 1904 while (s < lim) 1905 if ((r = (*d++ ^ *s++)) != 0) { 1906 while (r < 128) { 1907 match++; 1908 r <<= 1; 1909 } 1910 break; 1911 } else 1912 match += NBBY; 1913 return match; 1914 } 1915 1916 /* XXX: to be scope conscious */ 1917 int 1918 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1919 { 1920 int bytelen, bitlen; 1921 1922 /* sanity check */ 1923 if (len < 0 || len > 128) { 1924 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1925 len); 1926 return 0; 1927 } 1928 1929 bytelen = len / NBBY; 1930 bitlen = len % NBBY; 1931 1932 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1933 return 0; 1934 if (bitlen != 0 && 1935 p1->s6_addr[bytelen] >> (NBBY - bitlen) != 1936 p2->s6_addr[bytelen] >> (NBBY - bitlen)) 1937 return 0; 1938 1939 return 1; 1940 } 1941 1942 void 1943 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1944 { 1945 static const u_char maskarray[NBBY] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1946 int bytelen, bitlen, i; 1947 1948 /* sanity check */ 1949 if (len < 0 || len > 128) { 1950 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1951 len); 1952 return; 1953 } 1954 1955 bzero(maskp, sizeof(*maskp)); 1956 bytelen = len / NBBY; 1957 bitlen = len % NBBY; 1958 for (i = 0; i < bytelen; i++) 1959 maskp->s6_addr[i] = 0xff; 1960 if (bitlen) 1961 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1962 } 1963 1964 /* 1965 * return the best address out of the same scope. if no address was 1966 * found, return the first valid address from designated IF. 1967 */ 1968 struct in6_ifaddr * 1969 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 1970 { 1971 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 1972 struct ifaddr *ifa; 1973 struct in6_ifaddr *besta = 0; 1974 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 1975 1976 dep[0] = dep[1] = NULL; 1977 1978 /* 1979 * We first look for addresses in the same scope. 1980 * If there is one, return it. 1981 * If two or more, return one which matches the dst longest. 1982 * If none, return one of global addresses assigned other ifs. 1983 */ 1984 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1985 if (ifa->ifa_addr->sa_family != AF_INET6) 1986 continue; 1987 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1988 continue; /* XXX: is there any case to allow anycast? */ 1989 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1990 continue; /* don't use this interface */ 1991 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1992 continue; 1993 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1994 if (ip6_use_deprecated) 1995 dep[0] = (struct in6_ifaddr *)ifa; 1996 continue; 1997 } 1998 1999 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2000 /* 2001 * call in6_matchlen() as few as possible 2002 */ 2003 if (besta) { 2004 if (blen == -1) 2005 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2006 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2007 if (tlen > blen) { 2008 blen = tlen; 2009 besta = (struct in6_ifaddr *)ifa; 2010 } 2011 } else 2012 besta = (struct in6_ifaddr *)ifa; 2013 } 2014 } 2015 if (besta) 2016 return besta; 2017 2018 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 2019 if (ifa->ifa_addr->sa_family != AF_INET6) 2020 continue; 2021 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2022 continue; /* XXX: is there any case to allow anycast? */ 2023 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2024 continue; /* don't use this interface */ 2025 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2026 continue; 2027 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2028 if (ip6_use_deprecated) 2029 dep[1] = (struct in6_ifaddr *)ifa; 2030 continue; 2031 } 2032 2033 return (struct in6_ifaddr *)ifa; 2034 } 2035 2036 /* use the last-resort values, that are, deprecated addresses */ 2037 if (dep[0]) 2038 return dep[0]; 2039 if (dep[1]) 2040 return dep[1]; 2041 2042 return NULL; 2043 } 2044 2045 /* 2046 * perform DAD when interface becomes IFF_UP. 2047 */ 2048 void 2049 in6_if_up(struct ifnet *ifp) 2050 { 2051 struct ifaddr *ifa; 2052 struct in6_ifaddr *ia; 2053 2054 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 2055 if (ifa->ifa_addr->sa_family != AF_INET6) 2056 continue; 2057 ia = (struct in6_ifaddr *)ifa; 2058 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2059 /* 2060 * The TENTATIVE flag was likely set by hand 2061 * beforehand, implicitly indicating the need for DAD. 2062 * We may be able to skip the random delay in this 2063 * case, but we impose delays just in case. 2064 */ 2065 nd6_dad_start(ifa, 2066 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 2067 } 2068 } 2069 2070 /* 2071 * special cases, like 6to4, are handled in in6_ifattach 2072 */ 2073 in6_ifattach(ifp, NULL); 2074 } 2075 2076 int 2077 in6if_do_dad(struct ifnet *ifp) 2078 { 2079 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 2080 return 0; 2081 2082 switch (ifp->if_type) { 2083 case IFT_FAITH: 2084 /* 2085 * These interfaces do not have the IFF_LOOPBACK flag, 2086 * but loop packets back. We do not have to do DAD on such 2087 * interfaces. We should even omit it, because loop-backed 2088 * NS would confuse the DAD procedure. 2089 */ 2090 return 0; 2091 default: 2092 /* 2093 * Our DAD routine requires the interface up and running. 2094 * However, some interfaces can be up before the RUNNING 2095 * status. Additionaly, users may try to assign addresses 2096 * before the interface becomes up (or running). 2097 * We simply skip DAD in such a case as a work around. 2098 * XXX: we should rather mark "tentative" on such addresses, 2099 * and do DAD after the interface becomes ready. 2100 */ 2101 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != 2102 (IFF_UP|IFF_RUNNING)) 2103 return 0; 2104 2105 return 1; 2106 } 2107 } 2108 2109 /* 2110 * Calculate max IPv6 MTU through all the interfaces and store it 2111 * to in6_maxmtu. 2112 */ 2113 void 2114 in6_setmaxmtu() 2115 { 2116 unsigned long maxmtu = 0; 2117 struct ifnet *ifp; 2118 2119 TAILQ_FOREACH(ifp, &ifnet, if_list) { 2120 /* this function can be called during ifnet initialization */ 2121 if (!ifp->if_afdata[AF_INET6]) 2122 continue; 2123 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2124 IN6_LINKMTU(ifp) > maxmtu) 2125 maxmtu = IN6_LINKMTU(ifp); 2126 } 2127 if (maxmtu) /* update only when maxmtu is positive */ 2128 in6_maxmtu = maxmtu; 2129 } 2130 2131 /* 2132 * Provide the length of interface identifiers to be used for the link attached 2133 * to the given interface. The length should be defined in "IPv6 over 2134 * xxx-link" document. Note that address architecture might also define 2135 * the length for a particular set of address prefixes, regardless of the 2136 * link type. As clarified in rfc2462bis, those two definitions should be 2137 * consistent, and those really are as of August 2004. 2138 */ 2139 int 2140 in6_if2idlen(struct ifnet *ifp) 2141 { 2142 switch (ifp->if_type) { 2143 case IFT_ETHER: /* RFC2464 */ 2144 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2145 case IFT_L2VLAN: /* ditto */ 2146 case IFT_IEEE80211: /* ditto */ 2147 case IFT_FDDI: /* RFC2467 */ 2148 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 2149 case IFT_PPP: /* RFC2472 */ 2150 case IFT_ARCNET: /* RFC2497 */ 2151 case IFT_FRELAY: /* RFC2590 */ 2152 case IFT_IEEE1394: /* RFC3146 */ 2153 case IFT_GIF: /* draft-ietf-v6ops-mech-v2-07 */ 2154 case IFT_LOOP: /* XXX: is this really correct? */ 2155 return 64; 2156 default: 2157 /* 2158 * Unknown link type: 2159 * It might be controversial to use the today's common constant 2160 * of 64 for these cases unconditionally. For full compliance, 2161 * we should return an error in this case. On the other hand, 2162 * if we simply miss the standard for the link type or a new 2163 * standard is defined for a new link type, the IFID length 2164 * is very likely to be the common constant. As a compromise, 2165 * we always use the constant, but make an explicit notice 2166 * indicating the "unknown" case. 2167 */ 2168 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2169 return 64; 2170 } 2171 } 2172 2173 void * 2174 in6_domifattach(struct ifnet *ifp) 2175 { 2176 struct in6_ifextra *ext; 2177 2178 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2179 bzero(ext, sizeof(*ext)); 2180 2181 ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat), 2182 M_IFADDR, M_WAITOK); 2183 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat)); 2184 2185 ext->icmp6_ifstat = 2186 (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat), 2187 M_IFADDR, M_WAITOK); 2188 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat)); 2189 2190 ext->nd_ifinfo = nd6_ifattach(ifp); 2191 ext->scope6_id = scope6_ifattach(ifp); 2192 return ext; 2193 } 2194 2195 void 2196 in6_domifdetach(struct ifnet *ifp, void *aux) 2197 { 2198 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2199 2200 nd6_ifdetach(ext->nd_ifinfo); 2201 free(ext->in6_ifstat, M_IFADDR); 2202 free(ext->icmp6_ifstat, M_IFADDR); 2203 scope6_ifdetach(ext->scope6_id); 2204 free(ext, M_IFADDR); 2205 } 2206 2207 /* 2208 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2209 * v4 mapped addr or v4 compat addr 2210 */ 2211 void 2212 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2213 { 2214 bzero(sin, sizeof(*sin)); 2215 sin->sin_len = sizeof(struct sockaddr_in); 2216 sin->sin_family = AF_INET; 2217 sin->sin_port = sin6->sin6_port; 2218 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2219 } 2220 2221 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2222 void 2223 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2224 { 2225 bzero(sin6, sizeof(*sin6)); 2226 sin6->sin6_len = sizeof(struct sockaddr_in6); 2227 sin6->sin6_family = AF_INET6; 2228 sin6->sin6_port = sin->sin_port; 2229 sin6->sin6_addr.s6_addr32[0] = 0; 2230 sin6->sin6_addr.s6_addr32[1] = 0; 2231 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2232 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2233 } 2234 2235 /* Convert sockaddr_in6 into sockaddr_in. */ 2236 void 2237 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2238 { 2239 struct sockaddr_in *sin_p; 2240 struct sockaddr_in6 sin6; 2241 2242 /* 2243 * Save original sockaddr_in6 addr and convert it 2244 * to sockaddr_in. 2245 */ 2246 sin6 = *(struct sockaddr_in6 *)nam; 2247 sin_p = (struct sockaddr_in *)nam; 2248 in6_sin6_2_sin(sin_p, &sin6); 2249 } 2250 2251 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2252 void 2253 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2254 { 2255 struct sockaddr_in *sin_p; 2256 struct sockaddr_in6 *sin6_p; 2257 2258 sin6_p = malloc(sizeof(*sin6_p), M_SONAME, M_WAITOK); 2259 sin_p = (struct sockaddr_in *)*nam; 2260 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2261 free(*nam, M_SONAME); 2262 *nam = (struct sockaddr *)sin6_p; 2263 } 2264