1 /* $NetBSD: in6.c,v 1.286 2022/09/20 02:23:37 knakahara 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 1.286 2022/09/20 02:23:37 knakahara Exp $"); 66 67 #ifdef _KERNEL_OPT 68 #include "opt_inet.h" 69 #include "opt_compat_netbsd.h" 70 #include "opt_net_mpsafe.h" 71 #endif 72 73 #include <sys/param.h> 74 #include <sys/ioctl.h> 75 #include <sys/errno.h> 76 #include <sys/malloc.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/sockio.h> 80 #include <sys/systm.h> 81 #include <sys/proc.h> 82 #include <sys/time.h> 83 #include <sys/kernel.h> 84 #include <sys/syslog.h> 85 #include <sys/kauth.h> 86 #include <sys/cprng.h> 87 #include <sys/kmem.h> 88 89 #include <net/if.h> 90 #include <net/if_types.h> 91 #include <net/if_llatbl.h> 92 #include <net/if_ether.h> 93 #include <net/if_dl.h> 94 #include <net/pfil.h> 95 #include <net/route.h> 96 97 #include <netinet/in.h> 98 #include <netinet/in_var.h> 99 100 #include <netinet/ip6.h> 101 #include <netinet6/ip6_var.h> 102 #include <netinet6/nd6.h> 103 #include <netinet6/mld6_var.h> 104 #include <netinet6/ip6_mroute.h> 105 #include <netinet6/in6_ifattach.h> 106 #include <netinet6/scope6_var.h> 107 108 #ifdef COMPAT_50 109 #include <compat/netinet6/in6_var.h> 110 #endif 111 #ifdef COMPAT_90 112 #include <compat/netinet6/in6_var.h> 113 #include <compat/netinet6/nd6.h> 114 #endif 115 116 MALLOC_DEFINE(M_IP6OPT, "ip6_options", "IPv6 options"); 117 118 /* enable backward compatibility code for obsoleted ioctls */ 119 #define COMPAT_IN6IFIOCTL 120 121 #ifdef IN6_DEBUG 122 #define IN6_DPRINTF(__fmt, ...) printf(__fmt, __VA_ARGS__) 123 #else 124 #define IN6_DPRINTF(__fmt, ...) do { } while (/*CONSTCOND*/0) 125 #endif /* IN6_DEBUG */ 126 127 /* 128 * Definitions of some constant IP6 addresses. 129 */ 130 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 131 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 132 const struct in6_addr in6addr_nodelocal_allnodes = 133 IN6ADDR_NODELOCAL_ALLNODES_INIT; 134 const struct in6_addr in6addr_linklocal_allnodes = 135 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 136 const struct in6_addr in6addr_linklocal_allrouters = 137 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 138 139 const struct in6_addr in6mask0 = IN6MASK0; 140 const struct in6_addr in6mask32 = IN6MASK32; 141 const struct in6_addr in6mask64 = IN6MASK64; 142 const struct in6_addr in6mask96 = IN6MASK96; 143 const struct in6_addr in6mask128 = IN6MASK128; 144 145 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6, 146 0, 0, IN6ADDR_ANY_INIT, 0}; 147 148 struct pslist_head in6_ifaddr_list; 149 kmutex_t in6_ifaddr_lock; 150 151 static int in6_lifaddr_ioctl(struct socket *, u_long, void *, 152 struct ifnet *); 153 static int in6_ifaddprefix(struct in6_ifaddr *); 154 static int in6_ifremprefix(struct in6_ifaddr *); 155 static int in6_ifinit(struct ifnet *, struct in6_ifaddr *, 156 const struct sockaddr_in6 *, int); 157 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 158 static int in6_update_ifa1(struct ifnet *, struct in6_aliasreq *, 159 struct in6_ifaddr **, struct psref *, int); 160 161 void 162 in6_init(void) 163 { 164 165 PSLIST_INIT(&in6_ifaddr_list); 166 mutex_init(&in6_ifaddr_lock, MUTEX_DEFAULT, IPL_NONE); 167 168 in6_sysctl_multicast_setup(NULL); 169 } 170 171 /* 172 * Add ownaddr as loopback rtentry. We previously add the route only if 173 * necessary (ex. on a p2p link). However, since we now manage addresses 174 * separately from prefixes, we should always add the route. We can't 175 * rely on the cloning mechanism from the corresponding interface route 176 * any more. 177 */ 178 void 179 in6_ifaddlocal(struct ifaddr *ifa) 180 { 181 182 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &in6addr_any) || 183 (ifa->ifa_ifp->if_flags & IFF_POINTOPOINT && 184 IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), IFA_DSTIN6(ifa)))) 185 { 186 rt_addrmsg(RTM_NEWADDR, ifa); 187 return; 188 } 189 190 rt_ifa_addlocal(ifa); 191 } 192 193 /* 194 * Remove loopback rtentry of ownaddr generated by in6_ifaddlocal(), 195 * if it exists. 196 */ 197 void 198 in6_ifremlocal(struct ifaddr *ifa) 199 { 200 struct in6_ifaddr *ia; 201 struct ifaddr *alt_ifa = NULL; 202 int ia_count = 0; 203 struct psref psref; 204 int s; 205 206 /* 207 * Some of BSD variants do not remove cloned routes 208 * from an interface direct route, when removing the direct route 209 * (see comments in net/net_osdep.h). Even for variants that do remove 210 * cloned routes, they could fail to remove the cloned routes when 211 * we handle multiple addresses that share a common prefix. 212 * So, we should remove the route corresponding to the deleted address. 213 */ 214 215 /* 216 * Delete the entry only if exactly one ifaddr matches the 217 * address, ifa->ifa_addr. 218 * 219 * If more than one ifaddr matches, replace the ifaddr in 220 * the routing table, rt_ifa, with a different ifaddr than 221 * the one we are purging, ifa. It is important to do 222 * this, or else the routing table can accumulate dangling 223 * pointers rt->rt_ifa->ifa_ifp to destroyed interfaces, 224 * which will lead to crashes, later. (More than one ifaddr 225 * can match if we assign the same address to multiple---probably 226 * p2p---interfaces.) 227 * 228 * XXX An old comment at this place said, "we should avoid 229 * XXX such a configuration [i.e., interfaces with the same 230 * XXX addressed assigned --ed.] in IPv6...". I do not 231 * XXX agree, especially now that I have fixed the dangling 232 * XXX ifp-pointers bug. 233 */ 234 s = pserialize_read_enter(); 235 IN6_ADDRLIST_READER_FOREACH(ia) { 236 if (!IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) 237 continue; 238 if (ia->ia_ifp != ifa->ifa_ifp) 239 alt_ifa = &ia->ia_ifa; 240 if (++ia_count > 1 && alt_ifa != NULL) 241 break; 242 } 243 if (ia_count > 1 && alt_ifa != NULL) 244 ifa_acquire(alt_ifa, &psref); 245 pserialize_read_exit(s); 246 247 if (ia_count == 0) 248 return; 249 250 rt_ifa_remlocal(ifa, ia_count == 1 ? NULL : alt_ifa); 251 252 if (ia_count > 1 && alt_ifa != NULL) 253 ifa_release(alt_ifa, &psref); 254 } 255 256 /* Add prefix route for the network. */ 257 static int 258 in6_ifaddprefix(struct in6_ifaddr *ia) 259 { 260 int error, flags = 0; 261 262 if (in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) == 128) { 263 if (ia->ia_dstaddr.sin6_family != AF_INET6) 264 /* We don't need to install a host route. */ 265 return 0; 266 flags |= RTF_HOST; 267 } 268 269 /* Is this a connected route for neighbour discovery? */ 270 if (nd6_need_cache(ia->ia_ifp)) 271 flags |= RTF_CONNECTED; 272 273 if ((error = rtinit(&ia->ia_ifa, RTM_ADD, RTF_UP | flags)) == 0) 274 ia->ia_flags |= IFA_ROUTE; 275 else if (error == EEXIST) 276 /* Existence of the route is not an error. */ 277 error = 0; 278 279 return error; 280 } 281 282 static int 283 in6_rt_ifa_matcher(struct rtentry *rt, void *v) 284 { 285 struct ifaddr *ifa = v; 286 287 if (rt->rt_ifa == ifa) 288 return 1; 289 else 290 return 0; 291 } 292 293 /* Delete network prefix route if present. 294 * Re-add it to another address if the prefix matches. */ 295 static int 296 in6_ifremprefix(struct in6_ifaddr *target) 297 { 298 int error, s; 299 struct in6_ifaddr *ia; 300 301 if ((target->ia_flags & IFA_ROUTE) == 0) 302 return 0; 303 304 s = pserialize_read_enter(); 305 IN6_ADDRLIST_READER_FOREACH(ia) { 306 if (target->ia_dstaddr.sin6_len) { 307 if (ia->ia_dstaddr.sin6_len == 0 || 308 !IN6_ARE_ADDR_EQUAL(&ia->ia_dstaddr.sin6_addr, 309 &target->ia_dstaddr.sin6_addr)) 310 continue; 311 } else { 312 if (!IN6_ARE_MASKED_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 313 &target->ia_addr.sin6_addr, 314 &target->ia_prefixmask.sin6_addr)) 315 continue; 316 } 317 318 /* 319 * if we got a matching prefix route, move IFA_ROUTE to him 320 */ 321 if ((ia->ia_flags & IFA_ROUTE) == 0) { 322 struct psref psref; 323 int bound = curlwp_bind(); 324 325 ia6_acquire(ia, &psref); 326 pserialize_read_exit(s); 327 328 rtinit(&target->ia_ifa, RTM_DELETE, 0); 329 target->ia_flags &= ~IFA_ROUTE; 330 331 error = in6_ifaddprefix(ia); 332 333 if (!ISSET(target->ia_ifa.ifa_flags, IFA_DESTROYING)) 334 goto skip; 335 /* 336 * Replace rt_ifa of routes that have the removing address 337 * with the new address. 338 */ 339 rt_replace_ifa_matched_entries(AF_INET6, 340 in6_rt_ifa_matcher, &target->ia_ifa, &ia->ia_ifa); 341 342 skip: 343 ia6_release(ia, &psref); 344 curlwp_bindx(bound); 345 346 return error; 347 } 348 } 349 pserialize_read_exit(s); 350 351 /* 352 * noone seem to have prefix route. remove it. 353 */ 354 rtinit(&target->ia_ifa, RTM_DELETE, 0); 355 target->ia_flags &= ~IFA_ROUTE; 356 357 if (ISSET(target->ia_ifa.ifa_flags, IFA_DESTROYING)) { 358 /* Remove routes that have the removing address as rt_ifa. */ 359 rt_delete_matched_entries(AF_INET6, in6_rt_ifa_matcher, 360 &target->ia_ifa, true); 361 } 362 363 return 0; 364 } 365 366 int 367 in6_mask2len(struct in6_addr *mask, u_char *lim0) 368 { 369 int x = 0, y; 370 u_char *lim = lim0, *p; 371 372 /* ignore the scope_id part */ 373 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 374 lim = (u_char *)mask + sizeof(*mask); 375 for (p = (u_char *)mask; p < lim; x++, p++) { 376 if (*p != 0xff) 377 break; 378 } 379 y = 0; 380 if (p < lim) { 381 for (y = 0; y < NBBY; y++) { 382 if ((*p & (0x80 >> y)) == 0) 383 break; 384 } 385 } 386 387 /* 388 * when the limit pointer is given, do a stricter check on the 389 * remaining bits. 390 */ 391 if (p < lim) { 392 if (y != 0 && (*p & (0x00ff >> y)) != 0) 393 return -1; 394 for (p = p + 1; p < lim; p++) 395 if (*p != 0) 396 return -1; 397 } 398 399 return x * NBBY + y; 400 } 401 402 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 403 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 404 405 static int 406 in6_control1(struct socket *so, u_long cmd, void *data, struct ifnet *ifp) 407 { 408 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 409 struct in6_ifaddr *ia = NULL; 410 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 411 struct sockaddr_in6 *sa6; 412 int error, bound; 413 struct psref psref; 414 415 switch (cmd) { 416 case SIOCAADDRCTL_POLICY: 417 case SIOCDADDRCTL_POLICY: 418 /* Privileged. */ 419 return in6_src_ioctl(cmd, data); 420 /* 421 * XXX: Fix me, once we fix SIOCSIFADDR, SIOCIFDSTADDR, etc. 422 */ 423 case SIOCSIFADDR: 424 case SIOCSIFDSTADDR: 425 case SIOCSIFBRDADDR: 426 case SIOCSIFNETMASK: 427 return EOPNOTSUPP; 428 case SIOCGETSGCNT_IN6: 429 case SIOCGETMIFCNT_IN6: 430 return mrt6_ioctl(cmd, data); 431 case SIOCGIFADDRPREF: 432 case SIOCSIFADDRPREF: 433 if (ifp == NULL) 434 return EINVAL; 435 return ifaddrpref_ioctl(so, cmd, data, ifp); 436 } 437 438 if (ifp == NULL) 439 return EOPNOTSUPP; 440 441 switch (cmd) { 442 #ifdef OSIOCSIFINFO_IN6_90 443 case OSIOCSIFINFO_FLAGS_90: 444 case OSIOCSIFINFO_IN6_90: 445 case OSIOCSDEFIFACE_IN6: 446 case OSIOCSNDFLUSH_IN6: 447 case OSIOCSPFXFLUSH_IN6: 448 case OSIOCSRTRFLUSH_IN6: 449 #endif 450 case SIOCSIFINFO_FLAGS: 451 case SIOCSIFINFO_IN6: 452 /* Privileged. */ 453 /* FALLTHROUGH */ 454 #ifdef OSIOCGIFINFO_IN6 455 case OSIOCGIFINFO_IN6: 456 #endif 457 #ifdef OSIOCGIFINFO_IN6_90 458 case OSIOCGDRLST_IN6: 459 case OSIOCGPRLST_IN6: 460 case OSIOCGIFINFO_IN6_90: 461 case OSIOCGDEFIFACE_IN6: 462 #endif 463 case SIOCGIFINFO_IN6: 464 case SIOCGNBRINFO_IN6: 465 return nd6_ioctl(cmd, data, ifp); 466 } 467 468 switch (cmd) { 469 case SIOCALIFADDR: 470 case SIOCDLIFADDR: 471 /* Privileged. */ 472 /* FALLTHROUGH */ 473 case SIOCGLIFADDR: 474 return in6_lifaddr_ioctl(so, cmd, data, ifp); 475 } 476 477 /* 478 * Find address for this interface, if it exists. 479 * 480 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 481 * only, and used the first interface address as the target of other 482 * operations (without checking ifra_addr). This was because netinet 483 * code/API assumed at most 1 interface address per interface. 484 * Since IPv6 allows a node to assign multiple addresses 485 * on a single interface, we almost always look and check the 486 * presence of ifra_addr, and reject invalid ones here. 487 * It also decreases duplicated code among SIOC*_IN6 operations. 488 */ 489 switch (cmd) { 490 case SIOCAIFADDR_IN6: 491 #ifdef OSIOCAIFADDR_IN6 492 case OSIOCAIFADDR_IN6: 493 #endif 494 #ifdef OSIOCSIFPHYADDR_IN6 495 case OSIOCSIFPHYADDR_IN6: 496 #endif 497 case SIOCSIFPHYADDR_IN6: 498 sa6 = &ifra->ifra_addr; 499 break; 500 case SIOCSIFADDR_IN6: 501 case SIOCGIFADDR_IN6: 502 case SIOCSIFDSTADDR_IN6: 503 case SIOCSIFNETMASK_IN6: 504 case SIOCGIFDSTADDR_IN6: 505 case SIOCGIFNETMASK_IN6: 506 case SIOCDIFADDR_IN6: 507 case SIOCGIFPSRCADDR_IN6: 508 case SIOCGIFPDSTADDR_IN6: 509 case SIOCGIFAFLAG_IN6: 510 case SIOCGIFALIFETIME_IN6: 511 #ifdef OSIOCGIFALIFETIME_IN6 512 case OSIOCGIFALIFETIME_IN6: 513 #endif 514 case SIOCGIFSTAT_IN6: 515 case SIOCGIFSTAT_ICMP6: 516 sa6 = &ifr->ifr_addr; 517 break; 518 default: 519 sa6 = NULL; 520 break; 521 } 522 523 error = 0; 524 bound = curlwp_bind(); 525 if (sa6 && sa6->sin6_family == AF_INET6) { 526 if (sa6->sin6_scope_id != 0) 527 error = sa6_embedscope(sa6, 0); 528 else 529 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 530 if (error != 0) 531 goto out; 532 ia = in6ifa_ifpwithaddr_psref(ifp, &sa6->sin6_addr, &psref); 533 } else 534 ia = NULL; 535 536 switch (cmd) { 537 case SIOCSIFADDR_IN6: 538 case SIOCSIFDSTADDR_IN6: 539 case SIOCSIFNETMASK_IN6: 540 /* 541 * Since IPv6 allows a node to assign multiple addresses 542 * on a single interface, SIOCSIFxxx ioctls are deprecated. 543 */ 544 error = EINVAL; 545 goto release; 546 547 case SIOCDIFADDR_IN6: 548 /* 549 * for IPv4, we look for existing in_ifaddr here to allow 550 * "ifconfig if0 delete" to remove the first IPv4 address on 551 * the interface. For IPv6, as the spec allows multiple 552 * interface address from the day one, we consider "remove the 553 * first one" semantics to be not preferable. 554 */ 555 if (ia == NULL) { 556 error = EADDRNOTAVAIL; 557 goto out; 558 } 559 #ifdef OSIOCAIFADDR_IN6 560 /* FALLTHROUGH */ 561 case OSIOCAIFADDR_IN6: 562 #endif 563 /* FALLTHROUGH */ 564 case SIOCAIFADDR_IN6: 565 /* 566 * We always require users to specify a valid IPv6 address for 567 * the corresponding operation. 568 */ 569 if (ifra->ifra_addr.sin6_family != AF_INET6 || 570 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 571 error = EAFNOSUPPORT; 572 goto release; 573 } 574 /* Privileged. */ 575 576 break; 577 578 case SIOCGIFADDR_IN6: 579 /* This interface is basically deprecated. use SIOCGIFCONF. */ 580 /* FALLTHROUGH */ 581 case SIOCGIFAFLAG_IN6: 582 case SIOCGIFNETMASK_IN6: 583 case SIOCGIFDSTADDR_IN6: 584 case SIOCGIFALIFETIME_IN6: 585 #ifdef OSIOCGIFALIFETIME_IN6 586 case OSIOCGIFALIFETIME_IN6: 587 #endif 588 /* must think again about its semantics */ 589 if (ia == NULL) { 590 error = EADDRNOTAVAIL; 591 goto out; 592 } 593 break; 594 } 595 596 switch (cmd) { 597 598 case SIOCGIFADDR_IN6: 599 ifr->ifr_addr = ia->ia_addr; 600 error = sa6_recoverscope(&ifr->ifr_addr); 601 break; 602 603 case SIOCGIFDSTADDR_IN6: 604 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 605 error = EINVAL; 606 break; 607 } 608 /* 609 * XXX: should we check if ifa_dstaddr is NULL and return 610 * an error? 611 */ 612 ifr->ifr_dstaddr = ia->ia_dstaddr; 613 error = sa6_recoverscope(&ifr->ifr_dstaddr); 614 break; 615 616 case SIOCGIFNETMASK_IN6: 617 ifr->ifr_addr = ia->ia_prefixmask; 618 break; 619 620 case SIOCGIFAFLAG_IN6: 621 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 622 break; 623 624 case SIOCGIFSTAT_IN6: 625 if (ifp == NULL) { 626 error = EINVAL; 627 break; 628 } 629 memset(&ifr->ifr_ifru.ifru_stat, 0, 630 sizeof(ifr->ifr_ifru.ifru_stat)); 631 ifr->ifr_ifru.ifru_stat = 632 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat; 633 break; 634 635 case SIOCGIFSTAT_ICMP6: 636 if (ifp == NULL) { 637 error = EINVAL; 638 break; 639 } 640 memset(&ifr->ifr_ifru.ifru_icmp6stat, 0, 641 sizeof(ifr->ifr_ifru.ifru_icmp6stat)); 642 ifr->ifr_ifru.ifru_icmp6stat = 643 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat; 644 break; 645 646 #ifdef OSIOCGIFALIFETIME_IN6 647 case OSIOCGIFALIFETIME_IN6: 648 #endif 649 case SIOCGIFALIFETIME_IN6: 650 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 651 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 652 time_t maxexpire; 653 struct in6_addrlifetime *retlt = 654 &ifr->ifr_ifru.ifru_lifetime; 655 656 /* 657 * XXX: adjust expiration time assuming time_t is 658 * signed. 659 */ 660 maxexpire = ((time_t)~0) & 661 (time_t)~(1ULL << ((sizeof(maxexpire) * NBBY) - 1)); 662 if (ia->ia6_lifetime.ia6t_vltime < 663 maxexpire - ia->ia6_updatetime) { 664 retlt->ia6t_expire = ia->ia6_updatetime + 665 ia->ia6_lifetime.ia6t_vltime; 666 retlt->ia6t_expire = retlt->ia6t_expire ? 667 time_mono_to_wall(retlt->ia6t_expire) : 668 0; 669 } else 670 retlt->ia6t_expire = maxexpire; 671 } 672 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 673 time_t maxexpire; 674 struct in6_addrlifetime *retlt = 675 &ifr->ifr_ifru.ifru_lifetime; 676 677 /* 678 * XXX: adjust expiration time assuming time_t is 679 * signed. 680 */ 681 maxexpire = ((time_t)~0) & 682 (time_t)~(1ULL << ((sizeof(maxexpire) * NBBY) - 1)); 683 if (ia->ia6_lifetime.ia6t_pltime < 684 maxexpire - ia->ia6_updatetime) { 685 retlt->ia6t_preferred = ia->ia6_updatetime + 686 ia->ia6_lifetime.ia6t_pltime; 687 retlt->ia6t_preferred = retlt->ia6t_preferred ? 688 time_mono_to_wall(retlt->ia6t_preferred) : 689 0; 690 } else 691 retlt->ia6t_preferred = maxexpire; 692 } 693 #ifdef OSIOCFIFALIFETIME_IN6 694 if (cmd == OSIOCFIFALIFETIME_IN6) 695 in6_addrlifetime_to_in6_addrlifetime50( 696 &ifr->ifru.ifru_lifetime); 697 #endif 698 break; 699 700 #ifdef OSIOCAIFADDR_IN6 701 case OSIOCAIFADDR_IN6: 702 in6_aliasreq50_to_in6_aliasreq(ifra); 703 #endif 704 /*FALLTHROUGH*/ 705 case SIOCAIFADDR_IN6: 706 { 707 struct in6_addrlifetime *lt; 708 709 /* reject read-only flags */ 710 if ((ifra->ifra_flags & IN6_IFF_DUPLICATED) != 0 || 711 (ifra->ifra_flags & IN6_IFF_DETACHED) != 0 || 712 (ifra->ifra_flags & IN6_IFF_TENTATIVE) != 0 || 713 (ifra->ifra_flags & IN6_IFF_NODAD) != 0) { 714 error = EINVAL; 715 break; 716 } 717 /* 718 * ia6t_expire and ia6t_preferred won't be used for now, 719 * so just in case. 720 */ 721 lt = &ifra->ifra_lifetime; 722 if (lt->ia6t_expire != 0) 723 lt->ia6t_expire = time_wall_to_mono(lt->ia6t_expire); 724 if (lt->ia6t_preferred != 0) 725 lt->ia6t_preferred = 726 time_wall_to_mono(lt->ia6t_preferred); 727 /* 728 * make (ia == NULL) or update (ia != NULL) the interface 729 * address structure, and link it to the list. 730 */ 731 int s = splsoftnet(); 732 error = in6_update_ifa1(ifp, ifra, &ia, &psref, 0); 733 splx(s); 734 if (error) 735 break; 736 pfil_run_addrhooks(if_pfil, cmd, &ia->ia_ifa); 737 break; 738 } 739 740 case SIOCDIFADDR_IN6: 741 ia6_release(ia, &psref); 742 ifaref(&ia->ia_ifa); 743 in6_purgeaddr(&ia->ia_ifa); 744 pfil_run_addrhooks(if_pfil, cmd, &ia->ia_ifa); 745 ifafree(&ia->ia_ifa); 746 ia = NULL; 747 break; 748 749 default: 750 error = ENOTTY; 751 } 752 release: 753 ia6_release(ia, &psref); 754 out: 755 curlwp_bindx(bound); 756 return error; 757 } 758 759 int 760 in6_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp) 761 { 762 int error, s; 763 764 switch (cmd) { 765 #ifdef OSIOCSIFINFO_IN6_90 766 case OSIOCSIFINFO_FLAGS_90: 767 case OSIOCSIFINFO_IN6_90: 768 case OSIOCSDEFIFACE_IN6: 769 case OSIOCSNDFLUSH_IN6: 770 case OSIOCSPFXFLUSH_IN6: 771 case OSIOCSRTRFLUSH_IN6: 772 #endif 773 case SIOCSIFINFO_FLAGS: 774 case SIOCSIFINFO_IN6: 775 776 case SIOCALIFADDR: 777 case SIOCDLIFADDR: 778 779 case SIOCDIFADDR_IN6: 780 #ifdef OSIOCAIFADDR_IN6 781 case OSIOCAIFADDR_IN6: 782 #endif 783 case SIOCAIFADDR_IN6: 784 785 case SIOCAADDRCTL_POLICY: 786 case SIOCDADDRCTL_POLICY: 787 788 if (kauth_authorize_network(kauth_cred_get(), 789 KAUTH_NETWORK_SOCKET, 790 KAUTH_REQ_NETWORK_SOCKET_SETPRIV, 791 so, NULL, NULL)) 792 return EPERM; 793 break; 794 } 795 796 s = splsoftnet(); 797 #ifndef NET_MPSAFE 798 KASSERT(KERNEL_LOCKED_P()); 799 #endif 800 error = in6_control1(so , cmd, data, ifp); 801 splx(s); 802 return error; 803 } 804 805 static int 806 in6_get_llsol_addr(struct in6_addr *llsol, struct ifnet *ifp, 807 struct in6_addr *ip6) 808 { 809 int error; 810 811 memset(llsol, 0, sizeof(struct in6_addr)); 812 llsol->s6_addr16[0] = htons(0xff02); 813 llsol->s6_addr32[1] = 0; 814 llsol->s6_addr32[2] = htonl(1); 815 llsol->s6_addr32[3] = ip6->s6_addr32[3]; 816 llsol->s6_addr8[12] = 0xff; 817 818 error = in6_setscope(llsol, ifp, NULL); 819 if (error != 0) { 820 /* XXX: should not happen */ 821 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 822 } 823 824 return error; 825 } 826 827 static int 828 in6_join_mcastgroups(struct in6_aliasreq *ifra, struct in6_ifaddr *ia, 829 struct ifnet *ifp, int flags) 830 { 831 int error; 832 struct sockaddr_in6 mltaddr, mltmask; 833 struct in6_multi_mship *imm; 834 struct in6_addr llsol; 835 struct rtentry *rt; 836 int dad_delay; 837 char ip6buf[INET6_ADDRSTRLEN]; 838 839 /* join solicited multicast addr for new host id */ 840 error = in6_get_llsol_addr(&llsol, ifp, &ifra->ifra_addr.sin6_addr); 841 if (error != 0) 842 goto out; 843 dad_delay = 0; 844 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 845 /* 846 * We need a random delay for DAD on the address 847 * being configured. It also means delaying 848 * transmission of the corresponding MLD report to 849 * avoid report collision. 850 * [draft-ietf-ipv6-rfc2462bis-02.txt] 851 */ 852 dad_delay = cprng_fast32() % (MAX_RTR_SOLICITATION_DELAY * hz); 853 } 854 855 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */ 856 /* join solicited multicast addr for new host id */ 857 imm = in6_joingroup(ifp, &llsol, &error, dad_delay); 858 if (!imm) { 859 nd6log(LOG_ERR, 860 "addmulti failed for %s on %s (errno=%d)\n", 861 IN6_PRINT(ip6buf, &llsol), if_name(ifp), error); 862 goto out; 863 } 864 mutex_enter(&in6_ifaddr_lock); 865 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 866 mutex_exit(&in6_ifaddr_lock); 867 868 sockaddr_in6_init(&mltmask, &in6mask32, 0, 0, 0); 869 870 /* 871 * join link-local all-nodes address 872 */ 873 sockaddr_in6_init(&mltaddr, &in6addr_linklocal_allnodes, 874 0, 0, 0); 875 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 876 goto out; /* XXX: should not fail */ 877 878 /* 879 * XXX: do we really need this automatic routes? 880 * We should probably reconsider this stuff. Most applications 881 * actually do not need the routes, since they usually specify 882 * the outgoing interface. 883 */ 884 rt = rtalloc1(sin6tosa(&mltaddr), 0); 885 if (rt) { 886 if (memcmp(&mltaddr.sin6_addr, 887 &satocsin6(rt_getkey(rt))->sin6_addr, 888 MLTMASK_LEN)) { 889 rt_unref(rt); 890 rt = NULL; 891 } else if (rt->rt_ifp != ifp) { 892 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 893 "network %04x:%04x::/32 = %04x:%04x::/32\n", 894 __func__, rt->rt_ifp, ifp, ifp->if_xname, 895 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 896 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 897 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 898 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 899 #ifdef NET_MPSAFE 900 error = rt_update_prepare(rt); 901 if (error == 0) { 902 rt_replace_ifa(rt, &ia->ia_ifa); 903 rt->rt_ifp = ifp; 904 rt_update_finish(rt); 905 } else { 906 /* 907 * If error != 0, the rtentry is being 908 * destroyed, so doing nothing doesn't 909 * matter. 910 */ 911 } 912 #else 913 rt_replace_ifa(rt, &ia->ia_ifa); 914 rt->rt_ifp = ifp; 915 #endif 916 } 917 } 918 if (!rt) { 919 struct rt_addrinfo info; 920 921 memset(&info, 0, sizeof(info)); 922 info.rti_info[RTAX_DST] = sin6tosa(&mltaddr); 923 info.rti_info[RTAX_GATEWAY] = sin6tosa(&ia->ia_addr); 924 info.rti_info[RTAX_NETMASK] = sin6tosa(&mltmask); 925 info.rti_info[RTAX_IFA] = sin6tosa(&ia->ia_addr); 926 /* XXX: we need RTF_CONNECTED to fake nd6_rtrequest */ 927 info.rti_flags = RTF_UP | RTF_CONNECTED; 928 error = rtrequest1(RTM_ADD, &info, NULL); 929 if (error) 930 goto out; 931 } else { 932 rt_unref(rt); 933 } 934 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 935 if (!imm) { 936 nd6log(LOG_WARNING, 937 "addmulti failed for %s on %s (errno=%d)\n", 938 IN6_PRINT(ip6buf, &mltaddr.sin6_addr), 939 if_name(ifp), error); 940 goto out; 941 } 942 mutex_enter(&in6_ifaddr_lock); 943 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 944 mutex_exit(&in6_ifaddr_lock); 945 946 /* 947 * join node information group address 948 */ 949 dad_delay = 0; 950 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 951 /* 952 * The spec doesn't say anything about delay for this 953 * group, but the same logic should apply. 954 */ 955 dad_delay = cprng_fast32() % (MAX_RTR_SOLICITATION_DELAY * hz); 956 } 957 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr) != 0) 958 ; 959 else if ((imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 960 dad_delay)) == NULL) { /* XXX jinmei */ 961 nd6log(LOG_WARNING, 962 "addmulti failed for %s on %s (errno=%d)\n", 963 IN6_PRINT(ip6buf, &mltaddr.sin6_addr), 964 if_name(ifp), error); 965 /* XXX not very fatal, go on... */ 966 } else { 967 mutex_enter(&in6_ifaddr_lock); 968 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 969 mutex_exit(&in6_ifaddr_lock); 970 } 971 972 973 /* 974 * join interface-local all-nodes address. 975 * (ff01::1%ifN, and ff01::%ifN/32) 976 */ 977 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 978 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 979 goto out; /* XXX: should not fail */ 980 981 /* XXX: again, do we really need the route? */ 982 rt = rtalloc1(sin6tosa(&mltaddr), 0); 983 if (rt) { 984 /* 32bit came from "mltmask" */ 985 if (memcmp(&mltaddr.sin6_addr, 986 &satocsin6(rt_getkey(rt))->sin6_addr, 987 32 / NBBY)) { 988 rt_unref(rt); 989 rt = NULL; 990 } else if (rt->rt_ifp != ifp) { 991 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 992 "network %04x:%04x::/32 = %04x:%04x::/32\n", 993 __func__, rt->rt_ifp, ifp, ifp->if_xname, 994 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 995 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 996 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 997 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 998 #ifdef NET_MPSAFE 999 error = rt_update_prepare(rt); 1000 if (error == 0) { 1001 rt_replace_ifa(rt, &ia->ia_ifa); 1002 rt->rt_ifp = ifp; 1003 rt_update_finish(rt); 1004 } else { 1005 /* 1006 * If error != 0, the rtentry is being 1007 * destroyed, so doing nothing doesn't 1008 * matter. 1009 */ 1010 } 1011 #else 1012 rt_replace_ifa(rt, &ia->ia_ifa); 1013 rt->rt_ifp = ifp; 1014 #endif 1015 } 1016 } 1017 if (!rt) { 1018 struct rt_addrinfo info; 1019 1020 memset(&info, 0, sizeof(info)); 1021 info.rti_info[RTAX_DST] = sin6tosa(&mltaddr); 1022 info.rti_info[RTAX_GATEWAY] = sin6tosa(&ia->ia_addr); 1023 info.rti_info[RTAX_NETMASK] = sin6tosa(&mltmask); 1024 info.rti_info[RTAX_IFA] = sin6tosa(&ia->ia_addr); 1025 info.rti_flags = RTF_UP | RTF_CONNECTED; 1026 error = rtrequest1(RTM_ADD, &info, NULL); 1027 if (error) 1028 goto out; 1029 #undef MLTMASK_LEN 1030 } else { 1031 rt_unref(rt); 1032 } 1033 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1034 if (!imm) { 1035 nd6log(LOG_WARNING, 1036 "addmulti failed for %s on %s (errno=%d)\n", 1037 IN6_PRINT(ip6buf, &mltaddr.sin6_addr), 1038 if_name(ifp), error); 1039 goto out; 1040 } else { 1041 mutex_enter(&in6_ifaddr_lock); 1042 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1043 mutex_exit(&in6_ifaddr_lock); 1044 } 1045 return 0; 1046 1047 out: 1048 KASSERT(error != 0); 1049 return error; 1050 } 1051 1052 /* 1053 * Update parameters of an IPv6 interface address. 1054 * If necessary, a new entry is created and linked into address chains. 1055 * This function is separated from in6_control(). 1056 * XXX: should this be performed under splsoftnet()? 1057 */ 1058 static int 1059 in6_update_ifa1(struct ifnet *ifp, struct in6_aliasreq *ifra, 1060 struct in6_ifaddr **iap, struct psref *psref, int flags) 1061 { 1062 int error = 0, hostIsNew = 0, plen = -1; 1063 struct sockaddr_in6 dst6; 1064 struct in6_addrlifetime *lt; 1065 int dad_delay, was_tentative; 1066 struct in6_ifaddr *ia = iap ? *iap : NULL; 1067 char ip6buf[INET6_ADDRSTRLEN]; 1068 1069 KASSERT((iap == NULL && psref == NULL) || 1070 (iap != NULL && psref != NULL)); 1071 1072 /* Validate parameters */ 1073 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 1074 return EINVAL; 1075 1076 /* 1077 * The destination address for a p2p link must have a family 1078 * of AF_UNSPEC or AF_INET6. 1079 */ 1080 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 1081 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 1082 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 1083 return EAFNOSUPPORT; 1084 /* 1085 * validate ifra_prefixmask. don't check sin6_family, netmask 1086 * does not carry fields other than sin6_len. 1087 */ 1088 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 1089 return EINVAL; 1090 /* 1091 * Because the IPv6 address architecture is classless, we require 1092 * users to specify a (non 0) prefix length (mask) for a new address. 1093 * We also require the prefix (when specified) mask is valid, and thus 1094 * reject a non-consecutive mask. 1095 */ 1096 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 1097 return EINVAL; 1098 if (ifra->ifra_prefixmask.sin6_len != 0) { 1099 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 1100 (u_char *)&ifra->ifra_prefixmask + 1101 ifra->ifra_prefixmask.sin6_len); 1102 if (plen <= 0) 1103 return EINVAL; 1104 } else { 1105 /* 1106 * In this case, ia must not be NULL. We just use its prefix 1107 * length. 1108 */ 1109 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1110 } 1111 /* 1112 * If the destination address on a p2p interface is specified, 1113 * and the address is a scoped one, validate/set the scope 1114 * zone identifier. 1115 */ 1116 dst6 = ifra->ifra_dstaddr; 1117 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 1118 (dst6.sin6_family == AF_INET6)) { 1119 struct in6_addr in6_tmp; 1120 u_int32_t zoneid; 1121 1122 in6_tmp = dst6.sin6_addr; 1123 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 1124 return EINVAL; /* XXX: should be impossible */ 1125 1126 if (dst6.sin6_scope_id != 0) { 1127 if (dst6.sin6_scope_id != zoneid) 1128 return EINVAL; 1129 } else /* user omit to specify the ID. */ 1130 dst6.sin6_scope_id = zoneid; 1131 1132 /* convert into the internal form */ 1133 if (sa6_embedscope(&dst6, 0)) 1134 return EINVAL; /* XXX: should be impossible */ 1135 } 1136 /* 1137 * The destination address can be specified only for a p2p or a 1138 * loopback interface. If specified, the corresponding prefix length 1139 * must be 128. 1140 */ 1141 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 1142 #ifdef FORCE_P2PPLEN 1143 int i; 1144 #endif 1145 1146 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 1147 /* XXX: noisy message */ 1148 nd6log(LOG_INFO, "a destination can " 1149 "be specified for a p2p or a loopback IF only\n"); 1150 return EINVAL; 1151 } 1152 if (plen != 128) { 1153 nd6log(LOG_INFO, "prefixlen should " 1154 "be 128 when dstaddr is specified\n"); 1155 #ifdef FORCE_P2PPLEN 1156 /* 1157 * To be compatible with old configurations, 1158 * such as ifconfig gif0 inet6 2001::1 2001::2 1159 * prefixlen 126, we override the specified 1160 * prefixmask as if the prefix length was 128. 1161 */ 1162 ifra->ifra_prefixmask.sin6_len = 1163 sizeof(struct sockaddr_in6); 1164 for (i = 0; i < 4; i++) 1165 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i] = 1166 0xffffffff; 1167 plen = 128; 1168 #else 1169 return EINVAL; 1170 #endif 1171 } 1172 } 1173 /* lifetime consistency check */ 1174 lt = &ifra->ifra_lifetime; 1175 if (lt->ia6t_pltime > lt->ia6t_vltime) 1176 return EINVAL; 1177 if (lt->ia6t_vltime == 0) { 1178 /* 1179 * the following log might be noisy, but this is a typical 1180 * configuration mistake or a tool's bug. 1181 */ 1182 nd6log(LOG_INFO, "valid lifetime is 0 for %s\n", 1183 IN6_PRINT(ip6buf, &ifra->ifra_addr.sin6_addr)); 1184 1185 if (ia == NULL) 1186 return 0; /* there's nothing to do */ 1187 } 1188 1189 /* 1190 * If this is a new address, allocate a new ifaddr and link it 1191 * into chains. 1192 */ 1193 if (ia == NULL) { 1194 hostIsNew = 1; 1195 /* 1196 * When in6_update_ifa() is called in a process of a received 1197 * RA, it is called under an interrupt context. So, we should 1198 * call malloc with M_NOWAIT. 1199 */ 1200 ia = malloc(sizeof(*ia), M_IFADDR, M_NOWAIT|M_ZERO); 1201 if (ia == NULL) 1202 return ENOBUFS; 1203 LIST_INIT(&ia->ia6_memberships); 1204 /* Initialize the address and masks, and put time stamp */ 1205 ia->ia_ifa.ifa_addr = sin6tosa(&ia->ia_addr); 1206 ia->ia_addr.sin6_family = AF_INET6; 1207 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 1208 ia->ia6_createtime = time_uptime; 1209 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1210 /* 1211 * XXX: some functions expect that ifa_dstaddr is not 1212 * NULL for p2p interfaces. 1213 */ 1214 ia->ia_ifa.ifa_dstaddr = sin6tosa(&ia->ia_dstaddr); 1215 } else { 1216 ia->ia_ifa.ifa_dstaddr = NULL; 1217 } 1218 ia->ia_ifa.ifa_netmask = sin6tosa(&ia->ia_prefixmask); 1219 1220 ia->ia_ifp = ifp; 1221 IN6_ADDRLIST_ENTRY_INIT(ia); 1222 ifa_psref_init(&ia->ia_ifa); 1223 } 1224 1225 /* update timestamp */ 1226 ia->ia6_updatetime = time_uptime; 1227 1228 /* set prefix mask */ 1229 if (ifra->ifra_prefixmask.sin6_len) { 1230 if (ia->ia_prefixmask.sin6_len) { 1231 if (!IN6_ARE_ADDR_EQUAL(&ia->ia_prefixmask.sin6_addr, 1232 &ifra->ifra_prefixmask.sin6_addr)) 1233 in6_ifremprefix(ia); 1234 } 1235 ia->ia_prefixmask = ifra->ifra_prefixmask; 1236 } 1237 1238 /* Set destination address. */ 1239 if (dst6.sin6_family == AF_INET6) { 1240 if (!IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, 1241 &ia->ia_dstaddr.sin6_addr)) 1242 in6_ifremprefix(ia); 1243 ia->ia_dstaddr = dst6; 1244 } 1245 1246 /* 1247 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1248 * to see if the address is deprecated or invalidated, but initialize 1249 * these members for applications. 1250 */ 1251 ia->ia6_lifetime = ifra->ifra_lifetime; 1252 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1253 ia->ia6_lifetime.ia6t_expire = 1254 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1255 } else 1256 ia->ia6_lifetime.ia6t_expire = 0; 1257 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1258 ia->ia6_lifetime.ia6t_preferred = 1259 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1260 } else 1261 ia->ia6_lifetime.ia6t_preferred = 0; 1262 1263 /* 1264 * configure address flags. 1265 * We need to preserve tentative state so DAD works if 1266 * something adds the same address before DAD finishes. 1267 */ 1268 was_tentative = ia->ia6_flags & (IN6_IFF_TENTATIVE|IN6_IFF_DUPLICATED); 1269 ia->ia6_flags = ifra->ifra_flags; 1270 1271 /* 1272 * Make the address tentative before joining multicast addresses, 1273 * so that corresponding MLD responses would not have a tentative 1274 * source address. 1275 */ 1276 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1277 if (ifp->if_link_state == LINK_STATE_DOWN) { 1278 ia->ia6_flags |= IN6_IFF_DETACHED; 1279 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1280 } else if ((hostIsNew || was_tentative) && if_do_dad(ifp) && 1281 ip6_dad_enabled()) { 1282 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1283 } 1284 1285 /* 1286 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1287 * userland, make it deprecated. 1288 */ 1289 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1290 ia->ia6_lifetime.ia6t_pltime = 0; 1291 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1292 } 1293 1294 if (hostIsNew) { 1295 /* 1296 * We need a reference to ia before calling in6_ifinit. 1297 * Otherwise ia can be freed in in6_ifinit accidentally. 1298 */ 1299 ifaref(&ia->ia_ifa); 1300 } 1301 1302 /* Must execute in6_ifinit and ifa_insert atomically */ 1303 mutex_enter(&in6_ifaddr_lock); 1304 1305 /* reset the interface and routing table appropriately. */ 1306 error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew); 1307 if (error != 0) { 1308 if (hostIsNew) 1309 free(ia, M_IFADDR); 1310 mutex_exit(&in6_ifaddr_lock); 1311 return error; 1312 } 1313 1314 /* 1315 * We are done if we have simply modified an existing address. 1316 */ 1317 if (!hostIsNew) { 1318 mutex_exit(&in6_ifaddr_lock); 1319 return error; 1320 } 1321 1322 /* 1323 * Insert ia to the global list and ifa to the interface's list. 1324 * A reference to it is already gained above. 1325 */ 1326 IN6_ADDRLIST_WRITER_INSERT_TAIL(ia); 1327 ifa_insert(ifp, &ia->ia_ifa); 1328 1329 mutex_exit(&in6_ifaddr_lock); 1330 1331 /* 1332 * Beyond this point, we should call in6_purgeaddr upon an error, 1333 * not just go to unlink. 1334 */ 1335 1336 /* join necessary multicast groups */ 1337 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1338 error = in6_join_mcastgroups(ifra, ia, ifp, flags); 1339 if (error != 0) 1340 goto cleanup; 1341 } 1342 1343 if (nd6_need_cache(ifp)) { 1344 /* XXX maybe unnecessary */ 1345 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1346 ia->ia_ifa.ifa_flags |= RTF_CONNECTED; 1347 } 1348 1349 /* 1350 * Perform DAD, if needed. 1351 * XXX It may be of use, if we can administratively 1352 * disable DAD. 1353 */ 1354 if (hostIsNew && if_do_dad(ifp) && 1355 ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && 1356 (ia->ia6_flags & IN6_IFF_TENTATIVE)) 1357 { 1358 int mindelay, maxdelay; 1359 1360 dad_delay = 0; 1361 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1362 struct in6_addr llsol; 1363 struct in6_multi *in6m_sol = NULL; 1364 /* 1365 * We need to impose a delay before sending an NS 1366 * for DAD. Check if we also needed a delay for the 1367 * corresponding MLD message. If we did, the delay 1368 * should be larger than the MLD delay (this could be 1369 * relaxed a bit, but this simple logic is at least 1370 * safe). 1371 */ 1372 mindelay = 0; 1373 error = in6_get_llsol_addr(&llsol, ifp, 1374 &ifra->ifra_addr.sin6_addr); 1375 in6_multi_lock(RW_READER); 1376 if (error == 0) 1377 in6m_sol = in6_lookup_multi(&llsol, ifp); 1378 if (in6m_sol != NULL && 1379 in6m_sol->in6m_state == MLD_REPORTPENDING) { 1380 mindelay = in6m_sol->in6m_timer; 1381 } 1382 in6_multi_unlock(); 1383 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1384 if (maxdelay - mindelay == 0) 1385 dad_delay = 0; 1386 else { 1387 dad_delay = 1388 (cprng_fast32() % (maxdelay - mindelay)) + 1389 mindelay; 1390 } 1391 } 1392 /* +1 ensures callout is always used */ 1393 nd6_dad_start(&ia->ia_ifa, dad_delay + 1); 1394 } 1395 1396 if (iap != NULL) { 1397 *iap = ia; 1398 if (hostIsNew) 1399 ia6_acquire(ia, psref); 1400 } 1401 1402 return 0; 1403 1404 cleanup: 1405 in6_purgeaddr(&ia->ia_ifa); 1406 return error; 1407 } 1408 1409 int 1410 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags) 1411 { 1412 int rc, s; 1413 1414 s = splsoftnet(); 1415 rc = in6_update_ifa1(ifp, ifra, NULL, NULL, flags); 1416 splx(s); 1417 return rc; 1418 } 1419 1420 void 1421 in6_purgeaddr(struct ifaddr *ifa) 1422 { 1423 struct ifnet *ifp = ifa->ifa_ifp; 1424 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1425 struct in6_multi_mship *imm; 1426 1427 /* KASSERT(!ifa_held(ifa)); XXX need ifa_not_held (psref_not_held) */ 1428 KASSERT(IFNET_LOCKED(ifp)); 1429 1430 ifa->ifa_flags |= IFA_DESTROYING; 1431 1432 /* stop DAD processing */ 1433 nd6_dad_stop(ifa); 1434 1435 /* Delete any network route. */ 1436 in6_ifremprefix(ia); 1437 1438 /* Remove ownaddr's loopback rtentry, if it exists. */ 1439 in6_ifremlocal(&(ia->ia_ifa)); 1440 1441 /* 1442 * leave from multicast groups we have joined for the interface 1443 */ 1444 again: 1445 mutex_enter(&in6_ifaddr_lock); 1446 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1447 struct in6_multi *in6m __diagused = imm->i6mm_maddr; 1448 KASSERTMSG(in6m == NULL || in6m->in6m_ifp == ifp, 1449 "in6m_ifp=%s ifp=%s", in6m ? in6m->in6m_ifp->if_xname : NULL, 1450 ifp->if_xname); 1451 LIST_REMOVE(imm, i6mm_chain); 1452 mutex_exit(&in6_ifaddr_lock); 1453 1454 in6_leavegroup(imm); 1455 goto again; 1456 } 1457 mutex_exit(&in6_ifaddr_lock); 1458 1459 in6_unlink_ifa(ia, ifp); 1460 } 1461 1462 static void 1463 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1464 { 1465 int s = splsoftnet(); 1466 1467 mutex_enter(&in6_ifaddr_lock); 1468 IN6_ADDRLIST_WRITER_REMOVE(ia); 1469 ifa_remove(ifp, &ia->ia_ifa); 1470 /* Assume ifa_remove called pserialize_perform and psref_destroy */ 1471 mutex_exit(&in6_ifaddr_lock); 1472 IN6_ADDRLIST_ENTRY_DESTROY(ia); 1473 1474 /* 1475 * release another refcnt for the link from in6_ifaddr. 1476 * Note that we should decrement the refcnt at least once for all *BSD. 1477 */ 1478 ifafree(&ia->ia_ifa); 1479 1480 splx(s); 1481 } 1482 1483 void 1484 in6_purgeif(struct ifnet *ifp) 1485 { 1486 1487 IFNET_LOCK(ifp); 1488 in6_ifdetach(ifp); 1489 IFNET_UNLOCK(ifp); 1490 } 1491 1492 void 1493 in6_purge_mcast_references(struct in6_multi *in6m) 1494 { 1495 struct in6_ifaddr *ia; 1496 1497 KASSERT(in6_multi_locked(RW_WRITER)); 1498 1499 mutex_enter(&in6_ifaddr_lock); 1500 IN6_ADDRLIST_WRITER_FOREACH(ia) { 1501 struct in6_multi_mship *imm; 1502 LIST_FOREACH(imm, &ia->ia6_memberships, i6mm_chain) { 1503 if (imm->i6mm_maddr == in6m) 1504 imm->i6mm_maddr = NULL; 1505 } 1506 } 1507 mutex_exit(&in6_ifaddr_lock); 1508 } 1509 1510 /* 1511 * SIOC[GAD]LIFADDR. 1512 * SIOCGLIFADDR: get first address. (?) 1513 * SIOCGLIFADDR with IFLR_PREFIX: 1514 * get first address that matches the specified prefix. 1515 * SIOCALIFADDR: add the specified address. 1516 * SIOCALIFADDR with IFLR_PREFIX: 1517 * add the specified prefix, filling hostid part from 1518 * the first link-local address. prefixlen must be <= 64. 1519 * SIOCDLIFADDR: delete the specified address. 1520 * SIOCDLIFADDR with IFLR_PREFIX: 1521 * delete the first address that matches the specified prefix. 1522 * return values: 1523 * EINVAL on invalid parameters 1524 * EADDRNOTAVAIL on prefix match failed/specified address not found 1525 * other values may be returned from in6_ioctl() 1526 * 1527 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1528 * this is to accommodate address naming scheme other than RFC2374, 1529 * in the future. 1530 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1531 * address encoding scheme. (see figure on page 8) 1532 */ 1533 static int 1534 in6_lifaddr_ioctl(struct socket *so, u_long cmd, void *data, 1535 struct ifnet *ifp) 1536 { 1537 struct in6_ifaddr *ia = NULL; /* XXX gcc 4.8 maybe-uninitialized */ 1538 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1539 struct ifaddr *ifa; 1540 struct sockaddr *sa; 1541 1542 /* sanity checks */ 1543 if (!data || !ifp) { 1544 panic("invalid argument to in6_lifaddr_ioctl"); 1545 /* NOTREACHED */ 1546 } 1547 1548 switch (cmd) { 1549 case SIOCGLIFADDR: 1550 /* address must be specified on GET with IFLR_PREFIX */ 1551 if ((iflr->flags & IFLR_PREFIX) == 0) 1552 break; 1553 /* FALLTHROUGH */ 1554 case SIOCALIFADDR: 1555 case SIOCDLIFADDR: 1556 /* address must be specified on ADD and DELETE */ 1557 sa = (struct sockaddr *)&iflr->addr; 1558 if (sa->sa_family != AF_INET6) 1559 return EINVAL; 1560 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1561 return EINVAL; 1562 /* XXX need improvement */ 1563 sa = (struct sockaddr *)&iflr->dstaddr; 1564 if (sa->sa_family && sa->sa_family != AF_INET6) 1565 return EINVAL; 1566 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1567 return EINVAL; 1568 break; 1569 default: /* shouldn't happen */ 1570 #if 0 1571 panic("invalid cmd to in6_lifaddr_ioctl"); 1572 /* NOTREACHED */ 1573 #else 1574 return EOPNOTSUPP; 1575 #endif 1576 } 1577 if (sizeof(struct in6_addr) * NBBY < iflr->prefixlen) 1578 return EINVAL; 1579 1580 switch (cmd) { 1581 case SIOCALIFADDR: 1582 { 1583 struct in6_aliasreq ifra; 1584 struct in6_addr *xhostid = NULL; 1585 int prefixlen; 1586 int bound = curlwp_bind(); 1587 struct psref psref; 1588 1589 if ((iflr->flags & IFLR_PREFIX) != 0) { 1590 struct sockaddr_in6 *sin6; 1591 1592 /* 1593 * xhostid is to fill in the hostid part of the 1594 * address. xhostid points to the first link-local 1595 * address attached to the interface. 1596 */ 1597 ia = in6ifa_ifpforlinklocal_psref(ifp, 0, &psref); 1598 if (ia == NULL) { 1599 curlwp_bindx(bound); 1600 return EADDRNOTAVAIL; 1601 } 1602 xhostid = IFA_IN6(&ia->ia_ifa); 1603 1604 /* prefixlen must be <= 64. */ 1605 if (64 < iflr->prefixlen) { 1606 ia6_release(ia, &psref); 1607 curlwp_bindx(bound); 1608 return EINVAL; 1609 } 1610 prefixlen = iflr->prefixlen; 1611 1612 /* hostid part must be zero. */ 1613 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1614 if (sin6->sin6_addr.s6_addr32[2] != 0 1615 || sin6->sin6_addr.s6_addr32[3] != 0) { 1616 ia6_release(ia, &psref); 1617 curlwp_bindx(bound); 1618 return EINVAL; 1619 } 1620 } else 1621 prefixlen = iflr->prefixlen; 1622 1623 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1624 memset(&ifra, 0, sizeof(ifra)); 1625 memcpy(ifra.ifra_name, iflr->iflr_name, sizeof(ifra.ifra_name)); 1626 1627 memcpy(&ifra.ifra_addr, &iflr->addr, 1628 ((struct sockaddr *)&iflr->addr)->sa_len); 1629 if (xhostid) { 1630 /* fill in hostid part */ 1631 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1632 xhostid->s6_addr32[2]; 1633 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1634 xhostid->s6_addr32[3]; 1635 } 1636 1637 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1638 memcpy(&ifra.ifra_dstaddr, &iflr->dstaddr, 1639 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1640 if (xhostid) { 1641 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1642 xhostid->s6_addr32[2]; 1643 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1644 xhostid->s6_addr32[3]; 1645 } 1646 } 1647 if (xhostid) { 1648 ia6_release(ia, &psref); 1649 ia = NULL; 1650 } 1651 curlwp_bindx(bound); 1652 1653 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1654 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1655 1656 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 1657 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 1658 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1659 return in6_control(so, SIOCAIFADDR_IN6, &ifra, ifp); 1660 } 1661 case SIOCGLIFADDR: 1662 case SIOCDLIFADDR: 1663 { 1664 struct in6_addr mask, candidate, match; 1665 struct sockaddr_in6 *sin6; 1666 int cmp; 1667 int error, s; 1668 1669 memset(&mask, 0, sizeof(mask)); 1670 if (iflr->flags & IFLR_PREFIX) { 1671 /* lookup a prefix rather than address. */ 1672 in6_prefixlen2mask(&mask, iflr->prefixlen); 1673 1674 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1675 memcpy(&match, &sin6->sin6_addr, sizeof(match)); 1676 match.s6_addr32[0] &= mask.s6_addr32[0]; 1677 match.s6_addr32[1] &= mask.s6_addr32[1]; 1678 match.s6_addr32[2] &= mask.s6_addr32[2]; 1679 match.s6_addr32[3] &= mask.s6_addr32[3]; 1680 1681 /* if you set extra bits, that's wrong */ 1682 if (memcmp(&match, &sin6->sin6_addr, sizeof(match))) 1683 return EINVAL; 1684 1685 cmp = 1; 1686 } else { 1687 if (cmd == SIOCGLIFADDR) { 1688 /* on getting an address, take the 1st match */ 1689 cmp = 0; /* XXX */ 1690 } else { 1691 /* on deleting an address, do exact match */ 1692 in6_prefixlen2mask(&mask, 128); 1693 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1694 memcpy(&match, &sin6->sin6_addr, sizeof(match)); 1695 1696 cmp = 1; 1697 } 1698 } 1699 1700 s = pserialize_read_enter(); 1701 IFADDR_READER_FOREACH(ifa, ifp) { 1702 if (ifa->ifa_addr->sa_family != AF_INET6) 1703 continue; 1704 if (!cmp) 1705 break; 1706 1707 /* 1708 * XXX: this is adhoc, but is necessary to allow 1709 * a user to specify fe80::/64 (not /10) for a 1710 * link-local address. 1711 */ 1712 memcpy(&candidate, IFA_IN6(ifa), sizeof(candidate)); 1713 in6_clearscope(&candidate); 1714 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1715 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1716 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1717 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1718 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1719 break; 1720 } 1721 if (!ifa) { 1722 error = EADDRNOTAVAIL; 1723 goto error; 1724 } 1725 ia = ifa2ia6(ifa); 1726 1727 if (cmd == SIOCGLIFADDR) { 1728 /* fill in the if_laddrreq structure */ 1729 memcpy(&iflr->addr, &ia->ia_addr, ia->ia_addr.sin6_len); 1730 error = sa6_recoverscope( 1731 (struct sockaddr_in6 *)&iflr->addr); 1732 if (error != 0) 1733 goto error; 1734 1735 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1736 memcpy(&iflr->dstaddr, &ia->ia_dstaddr, 1737 ia->ia_dstaddr.sin6_len); 1738 error = sa6_recoverscope( 1739 (struct sockaddr_in6 *)&iflr->dstaddr); 1740 if (error != 0) 1741 goto error; 1742 } else 1743 memset(&iflr->dstaddr, 0, sizeof(iflr->dstaddr)); 1744 1745 iflr->prefixlen = 1746 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1747 1748 iflr->flags = ia->ia6_flags; /* XXX */ 1749 1750 error = 0; 1751 } else { 1752 struct in6_aliasreq ifra; 1753 1754 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1755 memset(&ifra, 0, sizeof(ifra)); 1756 memcpy(ifra.ifra_name, iflr->iflr_name, 1757 sizeof(ifra.ifra_name)); 1758 1759 memcpy(&ifra.ifra_addr, &ia->ia_addr, 1760 ia->ia_addr.sin6_len); 1761 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1762 memcpy(&ifra.ifra_dstaddr, &ia->ia_dstaddr, 1763 ia->ia_dstaddr.sin6_len); 1764 } else { 1765 memset(&ifra.ifra_dstaddr, 0, 1766 sizeof(ifra.ifra_dstaddr)); 1767 } 1768 memcpy(&ifra.ifra_dstaddr, &ia->ia_prefixmask, 1769 ia->ia_prefixmask.sin6_len); 1770 1771 ifra.ifra_flags = ia->ia6_flags; 1772 pserialize_read_exit(s); 1773 1774 return in6_control(so, SIOCDIFADDR_IN6, &ifra, ifp); 1775 } 1776 error: 1777 pserialize_read_exit(s); 1778 return error; 1779 } 1780 } 1781 1782 return EOPNOTSUPP; /* just for safety */ 1783 } 1784 1785 /* 1786 * Initialize an interface's internet6 address 1787 * and routing table entry. 1788 */ 1789 static int 1790 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1791 const struct sockaddr_in6 *sin6, int newhost) 1792 { 1793 int error = 0, ifacount = 0; 1794 int s; 1795 struct ifaddr *ifa; 1796 1797 KASSERT(mutex_owned(&in6_ifaddr_lock)); 1798 1799 /* 1800 * Give the interface a chance to initialize 1801 * if this is its first address, 1802 * and to validate the address if necessary. 1803 */ 1804 s = pserialize_read_enter(); 1805 IFADDR_READER_FOREACH(ifa, ifp) { 1806 if (ifa->ifa_addr->sa_family != AF_INET6) 1807 continue; 1808 ifacount++; 1809 } 1810 pserialize_read_exit(s); 1811 1812 ia->ia_addr = *sin6; 1813 1814 if (ifacount == 0 && 1815 (error = if_addr_init(ifp, &ia->ia_ifa, true)) != 0) { 1816 return error; 1817 } 1818 1819 ia->ia_ifa.ifa_metric = ifp->if_metric; 1820 1821 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1822 1823 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1824 if (newhost) { 1825 /* set the rtrequest function to create llinfo */ 1826 if (ifp->if_flags & IFF_POINTOPOINT) 1827 ia->ia_ifa.ifa_rtrequest = p2p_rtrequest; 1828 else if ((ifp->if_flags & IFF_LOOPBACK) == 0) 1829 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1830 in6_ifaddlocal(&ia->ia_ifa); 1831 } else { 1832 /* Inform the routing socket of new flags/timings */ 1833 rt_addrmsg(RTM_NEWADDR, &ia->ia_ifa); 1834 } 1835 1836 /* Add the network prefix route. */ 1837 if ((error = in6_ifaddprefix(ia)) != 0) { 1838 if (newhost) 1839 in6_ifremlocal(&ia->ia_ifa); 1840 return error; 1841 } 1842 1843 return error; 1844 } 1845 1846 static struct ifaddr * 1847 bestifa(struct ifaddr *best_ifa, struct ifaddr *ifa) 1848 { 1849 if (best_ifa == NULL || best_ifa->ifa_preference < ifa->ifa_preference) 1850 return ifa; 1851 return best_ifa; 1852 } 1853 1854 /* 1855 * Find an IPv6 interface link-local address specific to an interface. 1856 */ 1857 struct in6_ifaddr * 1858 in6ifa_ifpforlinklocal(const struct ifnet *ifp, const int ignoreflags) 1859 { 1860 struct ifaddr *best_ifa = NULL, *ifa; 1861 1862 IFADDR_READER_FOREACH(ifa, ifp) { 1863 if (ifa->ifa_addr->sa_family != AF_INET6) 1864 continue; 1865 if (!IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) 1866 continue; 1867 if ((((struct in6_ifaddr *)ifa)->ia6_flags & ignoreflags) != 0) 1868 continue; 1869 best_ifa = bestifa(best_ifa, ifa); 1870 } 1871 1872 return (struct in6_ifaddr *)best_ifa; 1873 } 1874 1875 struct in6_ifaddr * 1876 in6ifa_ifpforlinklocal_psref(const struct ifnet *ifp, const int ignoreflags, 1877 struct psref *psref) 1878 { 1879 struct in6_ifaddr *ia; 1880 int s = pserialize_read_enter(); 1881 1882 ia = in6ifa_ifpforlinklocal(ifp, ignoreflags); 1883 if (ia != NULL) 1884 ia6_acquire(ia, psref); 1885 pserialize_read_exit(s); 1886 1887 return ia; 1888 } 1889 1890 /* 1891 * find the internet address corresponding to a given address. 1892 * ifaddr is returned referenced. 1893 */ 1894 struct in6_ifaddr * 1895 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid) 1896 { 1897 struct in6_ifaddr *ia; 1898 int s; 1899 1900 s = pserialize_read_enter(); 1901 IN6_ADDRLIST_READER_FOREACH(ia) { 1902 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1903 if (zoneid != 0 && 1904 zoneid != ia->ia_addr.sin6_scope_id) 1905 continue; 1906 ifaref(&ia->ia_ifa); 1907 break; 1908 } 1909 } 1910 pserialize_read_exit(s); 1911 1912 return ia; 1913 } 1914 1915 /* 1916 * find the internet address corresponding to a given interface and address. 1917 */ 1918 struct in6_ifaddr * 1919 in6ifa_ifpwithaddr(const struct ifnet *ifp, const struct in6_addr *addr) 1920 { 1921 struct ifaddr *best_ifa = NULL, *ifa; 1922 1923 IFADDR_READER_FOREACH(ifa, ifp) { 1924 if (ifa->ifa_addr->sa_family != AF_INET6) 1925 continue; 1926 if (!IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1927 continue; 1928 best_ifa = bestifa(best_ifa, ifa); 1929 } 1930 1931 return (struct in6_ifaddr *)best_ifa; 1932 } 1933 1934 struct in6_ifaddr * 1935 in6ifa_ifpwithaddr_psref(const struct ifnet *ifp, const struct in6_addr *addr, 1936 struct psref *psref) 1937 { 1938 struct in6_ifaddr *ia; 1939 int s = pserialize_read_enter(); 1940 1941 ia = in6ifa_ifpwithaddr(ifp, addr); 1942 if (ia != NULL) 1943 ia6_acquire(ia, psref); 1944 pserialize_read_exit(s); 1945 1946 return ia; 1947 } 1948 1949 static struct in6_ifaddr * 1950 bestia(struct in6_ifaddr *best_ia, struct in6_ifaddr *ia) 1951 { 1952 if (best_ia == NULL || 1953 best_ia->ia_ifa.ifa_preference < ia->ia_ifa.ifa_preference) 1954 return ia; 1955 return best_ia; 1956 } 1957 1958 /* 1959 * Determine if an address is on a local network. 1960 */ 1961 int 1962 in6_localaddr(const struct in6_addr *in6) 1963 { 1964 struct in6_ifaddr *ia; 1965 int s; 1966 1967 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1968 return 1; 1969 1970 s = pserialize_read_enter(); 1971 IN6_ADDRLIST_READER_FOREACH(ia) { 1972 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1973 &ia->ia_prefixmask.sin6_addr)) { 1974 pserialize_read_exit(s); 1975 return 1; 1976 } 1977 } 1978 pserialize_read_exit(s); 1979 1980 return 0; 1981 } 1982 1983 int 1984 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1985 { 1986 struct in6_ifaddr *ia; 1987 int s; 1988 1989 s = pserialize_read_enter(); 1990 IN6_ADDRLIST_READER_FOREACH(ia) { 1991 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1992 &sa6->sin6_addr) && 1993 #ifdef SCOPEDROUTING 1994 ia->ia_addr.sin6_scope_id == sa6->sin6_scope_id && 1995 #endif 1996 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) { 1997 pserialize_read_exit(s); 1998 return 1; /* true */ 1999 } 2000 2001 /* XXX: do we still have to go thru the rest of the list? */ 2002 } 2003 pserialize_read_exit(s); 2004 2005 return 0; /* false */ 2006 } 2007 2008 /* 2009 * return length of part which dst and src are equal 2010 * hard coding... 2011 */ 2012 int 2013 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 2014 { 2015 int match = 0; 2016 u_char *s = (u_char *)src, *d = (u_char *)dst; 2017 u_char *lim = s + 16, r; 2018 2019 while (s < lim) 2020 if ((r = (*d++ ^ *s++)) != 0) { 2021 while (r < 128) { 2022 match++; 2023 r <<= 1; 2024 } 2025 break; 2026 } else 2027 match += NBBY; 2028 return match; 2029 } 2030 2031 void 2032 in6_prefixlen2mask(struct in6_addr *maskp, int len) 2033 { 2034 static const u_char maskarray[NBBY] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 2035 int bytelen, bitlen, i; 2036 2037 /* sanity check */ 2038 if (len < 0 || len > 128) { 2039 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 2040 len); 2041 return; 2042 } 2043 2044 memset(maskp, 0, sizeof(*maskp)); 2045 bytelen = len / NBBY; 2046 bitlen = len % NBBY; 2047 for (i = 0; i < bytelen; i++) 2048 maskp->s6_addr[i] = 0xff; 2049 if (bitlen) 2050 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 2051 } 2052 2053 /* 2054 * return the best address out of the same scope. if no address was 2055 * found, return the first valid address from designated IF. 2056 */ 2057 struct in6_ifaddr * 2058 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2059 { 2060 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2061 struct ifaddr *ifa; 2062 struct in6_ifaddr *best_ia = NULL, *ia; 2063 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2064 2065 dep[0] = dep[1] = NULL; 2066 2067 /* 2068 * We first look for addresses in the same scope. 2069 * If there is one, return it. 2070 * If two or more, return one which matches the dst longest. 2071 * If none, return one of global addresses assigned other ifs. 2072 */ 2073 IFADDR_READER_FOREACH(ifa, ifp) { 2074 if (ifa->ifa_addr->sa_family != AF_INET6) 2075 continue; 2076 ia = (struct in6_ifaddr *)ifa; 2077 if (ia->ia6_flags & IN6_IFF_ANYCAST) 2078 continue; /* XXX: is there any case to allow anycast? */ 2079 if (ia->ia6_flags & IN6_IFF_NOTREADY) 2080 continue; /* don't use this interface */ 2081 if (ia->ia6_flags & IN6_IFF_DETACHED) 2082 continue; 2083 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2084 if (ip6_use_deprecated) 2085 dep[0] = ia; 2086 continue; 2087 } 2088 2089 if (dst_scope != in6_addrscope(IFA_IN6(ifa))) 2090 continue; 2091 /* 2092 * call in6_matchlen() as few as possible 2093 */ 2094 if (best_ia == NULL) { 2095 best_ia = ia; 2096 continue; 2097 } 2098 if (blen == -1) 2099 blen = in6_matchlen(&best_ia->ia_addr.sin6_addr, dst); 2100 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2101 if (tlen > blen) { 2102 blen = tlen; 2103 best_ia = ia; 2104 } else if (tlen == blen) 2105 best_ia = bestia(best_ia, ia); 2106 } 2107 if (best_ia != NULL) 2108 return best_ia; 2109 2110 IFADDR_READER_FOREACH(ifa, ifp) { 2111 if (ifa->ifa_addr->sa_family != AF_INET6) 2112 continue; 2113 ia = (struct in6_ifaddr *)ifa; 2114 if (ia->ia6_flags & IN6_IFF_ANYCAST) 2115 continue; /* XXX: is there any case to allow anycast? */ 2116 if (ia->ia6_flags & IN6_IFF_NOTREADY) 2117 continue; /* don't use this interface */ 2118 if (ia->ia6_flags & IN6_IFF_DETACHED) 2119 continue; 2120 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2121 if (ip6_use_deprecated) 2122 dep[1] = (struct in6_ifaddr *)ifa; 2123 continue; 2124 } 2125 2126 best_ia = bestia(best_ia, ia); 2127 } 2128 if (best_ia != NULL) 2129 return best_ia; 2130 2131 /* use the last-resort values, that are, deprecated addresses */ 2132 if (dep[0]) 2133 return dep[0]; 2134 if (dep[1]) 2135 return dep[1]; 2136 2137 return NULL; 2138 } 2139 2140 /* 2141 * perform DAD when interface becomes IFF_UP. 2142 */ 2143 void 2144 in6_if_link_up(struct ifnet *ifp) 2145 { 2146 struct ifaddr *ifa; 2147 struct in6_ifaddr *ia; 2148 int s, bound; 2149 char ip6buf[INET6_ADDRSTRLEN]; 2150 2151 /* Ensure it's sane to run DAD */ 2152 if (ifp->if_link_state == LINK_STATE_DOWN) 2153 return; 2154 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 2155 return; 2156 2157 bound = curlwp_bind(); 2158 s = pserialize_read_enter(); 2159 IFADDR_READER_FOREACH(ifa, ifp) { 2160 struct psref psref; 2161 2162 if (ifa->ifa_addr->sa_family != AF_INET6) 2163 continue; 2164 2165 ifa_acquire(ifa, &psref); 2166 pserialize_read_exit(s); 2167 ia = (struct in6_ifaddr *)ifa; 2168 2169 /* If detached then mark as tentative */ 2170 if (ia->ia6_flags & IN6_IFF_DETACHED) { 2171 ia->ia6_flags &= ~IN6_IFF_DETACHED; 2172 if (ip6_dad_enabled() && if_do_dad(ifp)) { 2173 ia->ia6_flags |= IN6_IFF_TENTATIVE; 2174 nd6log(LOG_ERR, "%s marked tentative\n", 2175 IN6_PRINT(ip6buf, 2176 &ia->ia_addr.sin6_addr)); 2177 } else if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) 2178 rt_addrmsg(RTM_NEWADDR, ifa); 2179 } 2180 2181 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2182 int rand_delay; 2183 2184 /* Clear the duplicated flag as we're starting DAD. */ 2185 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; 2186 2187 /* 2188 * The TENTATIVE flag was likely set by hand 2189 * beforehand, implicitly indicating the need for DAD. 2190 * We may be able to skip the random delay in this 2191 * case, but we impose delays just in case. 2192 */ 2193 rand_delay = cprng_fast32() % 2194 (MAX_RTR_SOLICITATION_DELAY * hz); 2195 /* +1 ensures callout is always used */ 2196 nd6_dad_start(ifa, rand_delay + 1); 2197 } 2198 2199 s = pserialize_read_enter(); 2200 ifa_release(ifa, &psref); 2201 } 2202 pserialize_read_exit(s); 2203 curlwp_bindx(bound); 2204 } 2205 2206 void 2207 in6_if_up(struct ifnet *ifp) 2208 { 2209 2210 /* 2211 * special cases, like 6to4, are handled in in6_ifattach 2212 */ 2213 in6_ifattach(ifp, NULL); 2214 2215 /* interface may not support link state, so bring it up also */ 2216 in6_if_link_up(ifp); 2217 } 2218 2219 /* 2220 * Mark all addresses as detached. 2221 */ 2222 void 2223 in6_if_link_down(struct ifnet *ifp) 2224 { 2225 struct ifaddr *ifa; 2226 struct in6_ifaddr *ia; 2227 int s, bound; 2228 char ip6buf[INET6_ADDRSTRLEN]; 2229 2230 bound = curlwp_bind(); 2231 s = pserialize_read_enter(); 2232 IFADDR_READER_FOREACH(ifa, ifp) { 2233 struct psref psref; 2234 2235 if (ifa->ifa_addr->sa_family != AF_INET6) 2236 continue; 2237 2238 ifa_acquire(ifa, &psref); 2239 pserialize_read_exit(s); 2240 ia = (struct in6_ifaddr *)ifa; 2241 2242 /* Stop DAD processing */ 2243 nd6_dad_stop(ifa); 2244 2245 /* 2246 * Mark the address as detached. 2247 * This satisfies RFC4862 Section 5.3, but we should apply 2248 * this logic to all addresses to be a good citizen and 2249 * avoid potential duplicated addresses. 2250 * When the interface comes up again, detached addresses 2251 * are marked tentative and DAD commences. 2252 */ 2253 if (!(ia->ia6_flags & IN6_IFF_DETACHED)) { 2254 nd6log(LOG_DEBUG, "%s marked detached\n", 2255 IN6_PRINT(ip6buf, &ia->ia_addr.sin6_addr)); 2256 ia->ia6_flags |= IN6_IFF_DETACHED; 2257 ia->ia6_flags &= 2258 ~(IN6_IFF_TENTATIVE | IN6_IFF_DUPLICATED); 2259 rt_addrmsg(RTM_NEWADDR, ifa); 2260 } 2261 2262 s = pserialize_read_enter(); 2263 ifa_release(ifa, &psref); 2264 } 2265 pserialize_read_exit(s); 2266 curlwp_bindx(bound); 2267 } 2268 2269 void 2270 in6_if_down(struct ifnet *ifp) 2271 { 2272 2273 in6_if_link_down(ifp); 2274 lltable_purge_entries(LLTABLE6(ifp)); 2275 } 2276 2277 void 2278 in6_if_link_state_change(struct ifnet *ifp, int link_state) 2279 { 2280 2281 /* 2282 * Treat LINK_STATE_UNKNOWN as UP. 2283 * LINK_STATE_UNKNOWN transitions to LINK_STATE_DOWN when 2284 * if_link_state_change() transitions to LINK_STATE_UP. 2285 */ 2286 if (link_state == LINK_STATE_DOWN) 2287 in6_if_link_down(ifp); 2288 else 2289 in6_if_link_up(ifp); 2290 } 2291 2292 int 2293 in6_tunnel_validate(const struct ip6_hdr *ip6, const struct in6_addr *src, 2294 const struct in6_addr *dst) 2295 { 2296 2297 /* check for address match */ 2298 if (!IN6_ARE_ADDR_EQUAL(src, &ip6->ip6_dst) || 2299 !IN6_ARE_ADDR_EQUAL(dst, &ip6->ip6_src)) 2300 return 0; 2301 2302 /* martian filters on outer source - done in ip6_input */ 2303 2304 /* NOTE: the packet may be dropped by uRPF. */ 2305 2306 /* return valid bytes length */ 2307 return sizeof(*src) + sizeof(*dst); 2308 } 2309 2310 #define IN6_LLTBL_DEFAULT_HSIZE 32 2311 #define IN6_LLTBL_HASH(k, h) \ 2312 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 2313 2314 /* 2315 * Do actual deallocation of @lle. 2316 * Called by LLE_FREE_LOCKED when number of references 2317 * drops to zero. 2318 */ 2319 static void 2320 in6_lltable_destroy_lle(struct llentry *lle) 2321 { 2322 2323 KASSERTMSG(lle->la_numheld == 0, "la_numheld=%d", lle->la_numheld); 2324 2325 LLE_WUNLOCK(lle); 2326 LLE_LOCK_DESTROY(lle); 2327 llentry_pool_put(lle); 2328 } 2329 2330 static struct llentry * 2331 in6_lltable_new(const struct in6_addr *addr6, u_int flags) 2332 { 2333 struct llentry *lle; 2334 2335 lle = llentry_pool_get(PR_NOWAIT); 2336 if (lle == NULL) /* NB: caller generates msg */ 2337 return NULL; 2338 2339 lle->r_l3addr.addr6 = *addr6; 2340 lle->lle_refcnt = 1; 2341 lle->lle_free = in6_lltable_destroy_lle; 2342 LLE_LOCK_INIT(lle); 2343 callout_init(&lle->lle_timer, CALLOUT_MPSAFE); 2344 2345 return lle; 2346 } 2347 2348 static int 2349 in6_lltable_match_prefix(const struct sockaddr *prefix, 2350 const struct sockaddr *mask, u_int flags, struct llentry *lle) 2351 { 2352 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix; 2353 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask; 2354 2355 if (IN6_ARE_MASKED_ADDR_EQUAL(&lle->r_l3addr.addr6, 2356 &pfx->sin6_addr, &msk->sin6_addr) && 2357 ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) 2358 return 1; 2359 2360 return 0; 2361 } 2362 2363 static void 2364 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle) 2365 { 2366 2367 LLE_WLOCK_ASSERT(lle); 2368 (void) llentry_free(lle); 2369 } 2370 2371 static int 2372 in6_lltable_rtcheck(struct ifnet *ifp, u_int flags, 2373 const struct sockaddr *l3addr, const struct rtentry *rt) 2374 { 2375 char ip6buf[INET6_ADDRSTRLEN]; 2376 2377 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 2378 int s; 2379 struct ifaddr *ifa; 2380 /* 2381 * Create an ND6 cache for an IPv6 neighbor 2382 * that is not covered by our own prefix. 2383 */ 2384 /* XXX ifaof_ifpforaddr should take a const param */ 2385 s = pserialize_read_enter(); 2386 ifa = ifaof_ifpforaddr(l3addr, ifp); 2387 if (ifa != NULL) { 2388 pserialize_read_exit(s); 2389 return 0; 2390 } 2391 pserialize_read_exit(s); 2392 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2393 IN6_PRINT(ip6buf, 2394 &((const struct sockaddr_in6 *)l3addr)->sin6_addr)); 2395 return EINVAL; 2396 } 2397 return 0; 2398 } 2399 2400 static inline uint32_t 2401 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize) 2402 { 2403 2404 return IN6_LLTBL_HASH(dst->s6_addr32[3], hsize); 2405 } 2406 2407 static uint32_t 2408 in6_lltable_hash(const struct llentry *lle, uint32_t hsize) 2409 { 2410 2411 return in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize); 2412 } 2413 2414 static void 2415 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 2416 { 2417 struct sockaddr_in6 *sin6; 2418 2419 sin6 = (struct sockaddr_in6 *)sa; 2420 bzero(sin6, sizeof(*sin6)); 2421 sin6->sin6_family = AF_INET6; 2422 sin6->sin6_len = sizeof(*sin6); 2423 sin6->sin6_addr = lle->r_l3addr.addr6; 2424 } 2425 2426 static inline struct llentry * 2427 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst) 2428 { 2429 struct llentry *lle; 2430 struct llentries *lleh; 2431 u_int hashidx; 2432 2433 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize); 2434 lleh = &llt->lle_head[hashidx]; 2435 LIST_FOREACH(lle, lleh, lle_next) { 2436 if (lle->la_flags & LLE_DELETED) 2437 continue; 2438 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst)) 2439 break; 2440 } 2441 2442 return lle; 2443 } 2444 2445 static int 2446 in6_lltable_delete(struct lltable *llt, u_int flags, 2447 const struct sockaddr *l3addr) 2448 { 2449 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2450 struct llentry *lle; 2451 2452 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp); 2453 KASSERTMSG(l3addr->sa_family == AF_INET6, 2454 "sin_family %d", l3addr->sa_family); 2455 2456 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2457 2458 if (lle == NULL) { 2459 #ifdef LLTABLE_DEBUG 2460 char buf[64]; 2461 sockaddr_format(l3addr, buf, sizeof(buf)); 2462 log(LOG_INFO, "%s: cache for %s is not found\n", 2463 __func__, buf); 2464 #endif 2465 return ENOENT; 2466 } 2467 2468 LLE_WLOCK(lle); 2469 #ifdef LLTABLE_DEBUG 2470 { 2471 char buf[64]; 2472 sockaddr_format(l3addr, buf, sizeof(buf)); 2473 log(LOG_INFO, "%s: cache for %s (%p) is deleted\n", 2474 __func__, buf, lle); 2475 } 2476 #endif 2477 llentry_free(lle); 2478 2479 return 0; 2480 } 2481 2482 static struct llentry * 2483 in6_lltable_create(struct lltable *llt, u_int flags, 2484 const struct sockaddr *l3addr, const struct rtentry *rt) 2485 { 2486 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2487 struct ifnet *ifp = llt->llt_ifp; 2488 struct llentry *lle; 2489 2490 IF_AFDATA_WLOCK_ASSERT(ifp); 2491 KASSERTMSG(l3addr->sa_family == AF_INET6, 2492 "sin_family %d", l3addr->sa_family); 2493 2494 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2495 2496 if (lle != NULL) { 2497 LLE_WLOCK(lle); 2498 return lle; 2499 } 2500 2501 /* 2502 * A route that covers the given address must have 2503 * been installed 1st because we are doing a resolution, 2504 * verify this. 2505 */ 2506 if (!(flags & LLE_IFADDR) && 2507 in6_lltable_rtcheck(ifp, flags, l3addr, rt) != 0) 2508 return NULL; 2509 2510 lle = in6_lltable_new(&sin6->sin6_addr, flags); 2511 if (lle == NULL) { 2512 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2513 return NULL; 2514 } 2515 lle->la_flags = flags; 2516 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 2517 memcpy(&lle->ll_addr, CLLADDR(ifp->if_sadl), ifp->if_addrlen); 2518 lle->la_flags |= LLE_VALID; 2519 } 2520 2521 lltable_link_entry(llt, lle); 2522 LLE_WLOCK(lle); 2523 2524 return lle; 2525 } 2526 2527 static struct llentry * 2528 in6_lltable_lookup(struct lltable *llt, u_int flags, 2529 const struct sockaddr *l3addr) 2530 { 2531 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2532 struct llentry *lle; 2533 2534 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 2535 KASSERTMSG(l3addr->sa_family == AF_INET6, 2536 "sin_family %d", l3addr->sa_family); 2537 2538 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2539 2540 if (lle == NULL) 2541 return NULL; 2542 2543 if (flags & LLE_EXCLUSIVE) 2544 LLE_WLOCK(lle); 2545 else 2546 LLE_RLOCK(lle); 2547 return lle; 2548 } 2549 2550 static int 2551 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 2552 struct rt_walkarg *w) 2553 { 2554 struct sockaddr_in6 sin6; 2555 2556 LLTABLE_LOCK_ASSERT(); 2557 2558 /* skip deleted entries */ 2559 if (lle->la_flags & LLE_DELETED) 2560 return 0; 2561 2562 sockaddr_in6_init(&sin6, &lle->r_l3addr.addr6, 0, 0, 0); 2563 2564 return lltable_dump_entry(llt, lle, w, sin6tosa(&sin6)); 2565 } 2566 2567 static struct lltable * 2568 in6_lltattach(struct ifnet *ifp) 2569 { 2570 struct lltable *llt; 2571 2572 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE); 2573 llt->llt_af = AF_INET6; 2574 llt->llt_ifp = ifp; 2575 2576 llt->llt_lookup = in6_lltable_lookup; 2577 llt->llt_create = in6_lltable_create; 2578 llt->llt_delete = in6_lltable_delete; 2579 llt->llt_dump_entry = in6_lltable_dump_entry; 2580 llt->llt_hash = in6_lltable_hash; 2581 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry; 2582 llt->llt_free_entry = in6_lltable_free_entry; 2583 llt->llt_match_prefix = in6_lltable_match_prefix; 2584 lltable_link(llt); 2585 2586 return llt; 2587 } 2588 2589 void * 2590 in6_domifattach(struct ifnet *ifp) 2591 { 2592 struct in6_ifextra *ext; 2593 2594 ext = malloc(sizeof(*ext), M_IFADDR, M_WAITOK|M_ZERO); 2595 2596 ext->in6_ifstat = malloc(sizeof(struct in6_ifstat), 2597 M_IFADDR, M_WAITOK|M_ZERO); 2598 2599 ext->icmp6_ifstat = malloc(sizeof(struct icmp6_ifstat), 2600 M_IFADDR, M_WAITOK|M_ZERO); 2601 2602 ext->nd_ifinfo = nd6_ifattach(ifp); 2603 ext->scope6_id = scope6_ifattach(ifp); 2604 ext->lltable = in6_lltattach(ifp); 2605 2606 return ext; 2607 } 2608 2609 void 2610 in6_domifdetach(struct ifnet *ifp, void *aux) 2611 { 2612 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2613 2614 lltable_free(ext->lltable); 2615 ext->lltable = NULL; 2616 SOFTNET_LOCK_UNLESS_NET_MPSAFE(); 2617 nd6_ifdetach(ifp, ext); 2618 SOFTNET_UNLOCK_UNLESS_NET_MPSAFE(); 2619 free(ext->in6_ifstat, M_IFADDR); 2620 free(ext->icmp6_ifstat, M_IFADDR); 2621 scope6_ifdetach(ext->scope6_id); 2622 free(ext, M_IFADDR); 2623 } 2624 2625 /* 2626 * Convert IPv4 address stored in struct in_addr to IPv4-Mapped IPv6 address 2627 * stored in struct in6_addr as defined in RFC 4921 section 2.5.5.2. 2628 */ 2629 void 2630 in6_in_2_v4mapin6(const struct in_addr *in, struct in6_addr *in6) 2631 { 2632 in6->s6_addr32[0] = 0; 2633 in6->s6_addr32[1] = 0; 2634 in6->s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2635 in6->s6_addr32[3] = in->s_addr; 2636 } 2637 2638 /* 2639 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2640 * v4 mapped addr or v4 compat addr 2641 */ 2642 void 2643 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2644 { 2645 memset(sin, 0, sizeof(*sin)); 2646 sin->sin_len = sizeof(struct sockaddr_in); 2647 sin->sin_family = AF_INET; 2648 sin->sin_port = sin6->sin6_port; 2649 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2650 } 2651 2652 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2653 void 2654 in6_sin_2_v4mapsin6(const struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2655 { 2656 memset(sin6, 0, sizeof(*sin6)); 2657 sin6->sin6_len = sizeof(struct sockaddr_in6); 2658 sin6->sin6_family = AF_INET6; 2659 sin6->sin6_port = sin->sin_port; 2660 in6_in_2_v4mapin6(&sin->sin_addr, &sin6->sin6_addr); 2661 } 2662 2663 /* Convert sockaddr_in6 into sockaddr_in. */ 2664 void 2665 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2666 { 2667 struct sockaddr_in *sin_p; 2668 struct sockaddr_in6 sin6; 2669 2670 /* 2671 * Save original sockaddr_in6 addr and convert it 2672 * to sockaddr_in. 2673 */ 2674 sin6 = *(struct sockaddr_in6 *)nam; 2675 sin_p = (struct sockaddr_in *)nam; 2676 in6_sin6_2_sin(sin_p, &sin6); 2677 } 2678 2679 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2680 void 2681 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2682 { 2683 struct sockaddr_in *sin_p; 2684 struct sockaddr_in6 *sin6_p; 2685 2686 sin6_p = malloc(sizeof(*sin6_p), M_SONAME, M_WAITOK); 2687 sin_p = (struct sockaddr_in *)*nam; 2688 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2689 free(*nam, M_SONAME); 2690 *nam = sin6tosa(sin6_p); 2691 } 2692