1 /* $NetBSD: in6.c,v 1.220 2016/09/13 15:57:50 christos 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 1.220 2016/09/13 15:57:50 christos Exp $"); 66 67 #ifdef _KERNEL_OPT 68 #include "opt_inet.h" 69 #include "opt_compat_netbsd.h" 70 #endif 71 72 #include <sys/param.h> 73 #include <sys/ioctl.h> 74 #include <sys/errno.h> 75 #include <sys/malloc.h> 76 #include <sys/socket.h> 77 #include <sys/socketvar.h> 78 #include <sys/sockio.h> 79 #include <sys/systm.h> 80 #include <sys/proc.h> 81 #include <sys/time.h> 82 #include <sys/kernel.h> 83 #include <sys/syslog.h> 84 #include <sys/kauth.h> 85 #include <sys/cprng.h> 86 #include <sys/kmem.h> 87 88 #include <net/if.h> 89 #include <net/if_types.h> 90 #include <net/if_llatbl.h> 91 #include <net/if_ether.h> 92 #include <net/if_dl.h> 93 #include <net/pfil.h> 94 #include <net/route.h> 95 96 #include <netinet/in.h> 97 #include <netinet/in_var.h> 98 99 #include <netinet/ip6.h> 100 #include <netinet6/ip6_var.h> 101 #include <netinet6/nd6.h> 102 #include <netinet6/mld6_var.h> 103 #include <netinet6/ip6_mroute.h> 104 #include <netinet6/in6_ifattach.h> 105 #include <netinet6/scope6_var.h> 106 107 #include <net/net_osdep.h> 108 109 #ifdef COMPAT_50 110 #include <compat/netinet6/in6_var.h> 111 #endif 112 113 MALLOC_DEFINE(M_IP6OPT, "ip6_options", "IPv6 options"); 114 115 /* enable backward compatibility code for obsoleted ioctls */ 116 #define COMPAT_IN6IFIOCTL 117 118 #ifdef IN6_DEBUG 119 #define IN6_DPRINTF(__fmt, ...) printf(__fmt, __VA_ARGS__) 120 #else 121 #define IN6_DPRINTF(__fmt, ...) do { } while (/*CONSTCOND*/0) 122 #endif /* IN6_DEBUG */ 123 124 /* 125 * Definitions of some constant IP6 addresses. 126 */ 127 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 128 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 129 const struct in6_addr in6addr_nodelocal_allnodes = 130 IN6ADDR_NODELOCAL_ALLNODES_INIT; 131 const struct in6_addr in6addr_linklocal_allnodes = 132 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 133 const struct in6_addr in6addr_linklocal_allrouters = 134 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 135 136 const struct in6_addr in6mask0 = IN6MASK0; 137 const struct in6_addr in6mask32 = IN6MASK32; 138 const struct in6_addr in6mask64 = IN6MASK64; 139 const struct in6_addr in6mask96 = IN6MASK96; 140 const struct in6_addr in6mask128 = IN6MASK128; 141 142 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6, 143 0, 0, IN6ADDR_ANY_INIT, 0}; 144 145 struct pslist_head in6_ifaddr_list; 146 kmutex_t in6_ifaddr_lock; 147 148 static int in6_lifaddr_ioctl(struct socket *, u_long, void *, 149 struct ifnet *); 150 static int in6_ifaddprefix(struct in6_ifaddr *); 151 static int in6_ifremprefix(struct in6_ifaddr *); 152 static int in6_ifinit(struct ifnet *, struct in6_ifaddr *, 153 const struct sockaddr_in6 *, int); 154 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 155 156 void 157 in6_init(void) 158 { 159 160 PSLIST_INIT(&in6_ifaddr_list); 161 mutex_init(&in6_ifaddr_lock, MUTEX_DEFAULT, IPL_NONE); 162 } 163 164 /* 165 * Add ownaddr as loopback rtentry. We previously add the route only if 166 * necessary (ex. on a p2p link). However, since we now manage addresses 167 * separately from prefixes, we should always add the route. We can't 168 * rely on the cloning mechanism from the corresponding interface route 169 * any more. 170 */ 171 void 172 in6_ifaddlocal(struct ifaddr *ifa) 173 { 174 175 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &in6addr_any) || 176 (ifa->ifa_ifp->if_flags & IFF_POINTOPOINT && 177 IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), IFA_DSTIN6(ifa)))) 178 { 179 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 180 return; 181 } 182 183 rt_ifa_addlocal(ifa); 184 } 185 186 /* 187 * Remove loopback rtentry of ownaddr generated by in6_ifaddlocal(), 188 * if it exists. 189 */ 190 void 191 in6_ifremlocal(struct ifaddr *ifa) 192 { 193 struct in6_ifaddr *ia; 194 struct ifaddr *alt_ifa = NULL; 195 int ia_count = 0; 196 struct psref psref; 197 int s; 198 199 /* 200 * Some of BSD variants do not remove cloned routes 201 * from an interface direct route, when removing the direct route 202 * (see comments in net/net_osdep.h). Even for variants that do remove 203 * cloned routes, they could fail to remove the cloned routes when 204 * we handle multple addresses that share a common prefix. 205 * So, we should remove the route corresponding to the deleted address. 206 */ 207 208 /* 209 * Delete the entry only if exactly one ifaddr matches the 210 * address, ifa->ifa_addr. 211 * 212 * If more than one ifaddr matches, replace the ifaddr in 213 * the routing table, rt_ifa, with a different ifaddr than 214 * the one we are purging, ifa. It is important to do 215 * this, or else the routing table can accumulate dangling 216 * pointers rt->rt_ifa->ifa_ifp to destroyed interfaces, 217 * which will lead to crashes, later. (More than one ifaddr 218 * can match if we assign the same address to multiple---probably 219 * p2p---interfaces.) 220 * 221 * XXX An old comment at this place said, "we should avoid 222 * XXX such a configuration [i.e., interfaces with the same 223 * XXX addressed assigned --ed.] in IPv6...". I do not 224 * XXX agree, especially now that I have fixed the dangling 225 * XXX ifp-pointers bug. 226 */ 227 s = pserialize_read_enter(); 228 IN6_ADDRLIST_READER_FOREACH(ia) { 229 if (!IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) 230 continue; 231 if (ia->ia_ifp != ifa->ifa_ifp) 232 alt_ifa = &ia->ia_ifa; 233 if (++ia_count > 1 && alt_ifa != NULL) 234 break; 235 } 236 if (ia_count > 1 && alt_ifa != NULL) 237 ifa_acquire(alt_ifa, &psref); 238 pserialize_read_exit(s); 239 240 if (ia_count == 0) 241 return; 242 243 rt_ifa_remlocal(ifa, ia_count == 1 ? NULL : alt_ifa); 244 245 if (ia_count > 1 && alt_ifa != NULL) 246 ifa_release(alt_ifa, &psref); 247 } 248 249 /* Add prefix route for the network. */ 250 static int 251 in6_ifaddprefix(struct in6_ifaddr *ia) 252 { 253 int error, flags = 0; 254 255 if (in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) == 128) { 256 if (ia->ia_dstaddr.sin6_family != AF_INET6) 257 /* We don't need to install a host route. */ 258 return 0; 259 flags |= RTF_HOST; 260 } 261 262 /* Is this a connected route for neighbour discovery? */ 263 if (nd6_need_cache(ia->ia_ifp)) 264 flags |= RTF_CONNECTED; 265 266 if ((error = rtinit(&ia->ia_ifa, RTM_ADD, RTF_UP | flags)) == 0) 267 ia->ia_flags |= IFA_ROUTE; 268 else if (error == EEXIST) 269 /* Existance of the route is not an error. */ 270 error = 0; 271 272 return error; 273 } 274 275 /* Delete network prefix route if present. 276 * Re-add it to another address if the prefix matches. */ 277 static int 278 in6_ifremprefix(struct in6_ifaddr *target) 279 { 280 int error, s; 281 struct in6_ifaddr *ia; 282 283 if ((target->ia_flags & IFA_ROUTE) == 0) 284 return 0; 285 286 s = pserialize_read_enter(); 287 IN6_ADDRLIST_READER_FOREACH(ia) { 288 if (target->ia_dstaddr.sin6_len) { 289 if (ia->ia_dstaddr.sin6_len == 0 || 290 !IN6_ARE_ADDR_EQUAL(&ia->ia_dstaddr.sin6_addr, 291 &target->ia_dstaddr.sin6_addr)) 292 continue; 293 } else { 294 if (!IN6_ARE_MASKED_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 295 &target->ia_addr.sin6_addr, 296 &target->ia_prefixmask.sin6_addr)) 297 continue; 298 } 299 300 /* 301 * if we got a matching prefix route, move IFA_ROUTE to him 302 */ 303 if ((ia->ia_flags & IFA_ROUTE) == 0) { 304 struct psref psref; 305 int bound = curlwp_bind(); 306 307 ia6_acquire(ia, &psref); 308 pserialize_read_exit(s); 309 310 rtinit(&target->ia_ifa, RTM_DELETE, 0); 311 target->ia_flags &= ~IFA_ROUTE; 312 313 error = in6_ifaddprefix(ia); 314 315 ia6_release(ia, &psref); 316 curlwp_bindx(bound); 317 318 return error; 319 } 320 } 321 pserialize_read_exit(s); 322 323 /* 324 * noone seem to have prefix route. remove it. 325 */ 326 rtinit(&target->ia_ifa, RTM_DELETE, 0); 327 target->ia_flags &= ~IFA_ROUTE; 328 return 0; 329 } 330 331 int 332 in6_mask2len(struct in6_addr *mask, u_char *lim0) 333 { 334 int x = 0, y; 335 u_char *lim = lim0, *p; 336 337 /* ignore the scope_id part */ 338 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 339 lim = (u_char *)mask + sizeof(*mask); 340 for (p = (u_char *)mask; p < lim; x++, p++) { 341 if (*p != 0xff) 342 break; 343 } 344 y = 0; 345 if (p < lim) { 346 for (y = 0; y < NBBY; y++) { 347 if ((*p & (0x80 >> y)) == 0) 348 break; 349 } 350 } 351 352 /* 353 * when the limit pointer is given, do a stricter check on the 354 * remaining bits. 355 */ 356 if (p < lim) { 357 if (y != 0 && (*p & (0x00ff >> y)) != 0) 358 return -1; 359 for (p = p + 1; p < lim; p++) 360 if (*p != 0) 361 return -1; 362 } 363 364 return x * NBBY + y; 365 } 366 367 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 368 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 369 370 static int 371 in6_control1(struct socket *so, u_long cmd, void *data, struct ifnet *ifp) 372 { 373 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 374 struct in6_ifaddr *ia = NULL; 375 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 376 struct sockaddr_in6 *sa6; 377 int error, bound; 378 struct psref psref; 379 bool run_hooks = false; 380 381 switch (cmd) { 382 case SIOCAADDRCTL_POLICY: 383 case SIOCDADDRCTL_POLICY: 384 /* Privileged. */ 385 return in6_src_ioctl(cmd, data); 386 /* 387 * XXX: Fix me, once we fix SIOCSIFADDR, SIOCIFDSTADDR, etc. 388 */ 389 case SIOCSIFADDR: 390 case SIOCSIFDSTADDR: 391 case SIOCSIFBRDADDR: 392 case SIOCSIFNETMASK: 393 return EOPNOTSUPP; 394 case SIOCGETSGCNT_IN6: 395 case SIOCGETMIFCNT_IN6: 396 return mrt6_ioctl(cmd, data); 397 case SIOCGIFADDRPREF: 398 case SIOCSIFADDRPREF: 399 if (ifp == NULL) 400 return EINVAL; 401 return ifaddrpref_ioctl(so, cmd, data, ifp); 402 } 403 404 if (ifp == NULL) 405 return EOPNOTSUPP; 406 407 switch (cmd) { 408 case SIOCSNDFLUSH_IN6: 409 case SIOCSPFXFLUSH_IN6: 410 case SIOCSRTRFLUSH_IN6: 411 case SIOCSDEFIFACE_IN6: 412 case SIOCSIFINFO_FLAGS: 413 case SIOCSIFINFO_IN6: 414 /* Privileged. */ 415 /* FALLTHROUGH */ 416 case OSIOCGIFINFO_IN6: 417 case SIOCGIFINFO_IN6: 418 case SIOCGDRLST_IN6: 419 case SIOCGPRLST_IN6: 420 case SIOCGNBRINFO_IN6: 421 case SIOCGDEFIFACE_IN6: 422 return nd6_ioctl(cmd, data, ifp); 423 } 424 425 switch (cmd) { 426 case SIOCSIFPREFIX_IN6: 427 case SIOCDIFPREFIX_IN6: 428 case SIOCAIFPREFIX_IN6: 429 case SIOCCIFPREFIX_IN6: 430 case SIOCSGIFPREFIX_IN6: 431 case SIOCGIFPREFIX_IN6: 432 log(LOG_NOTICE, 433 "prefix ioctls are now invalidated. " 434 "please use ifconfig.\n"); 435 return EOPNOTSUPP; 436 } 437 438 switch (cmd) { 439 case SIOCALIFADDR: 440 case SIOCDLIFADDR: 441 /* Privileged. */ 442 /* FALLTHROUGH */ 443 case SIOCGLIFADDR: 444 return in6_lifaddr_ioctl(so, cmd, data, ifp); 445 } 446 447 /* 448 * Find address for this interface, if it exists. 449 * 450 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 451 * only, and used the first interface address as the target of other 452 * operations (without checking ifra_addr). This was because netinet 453 * code/API assumed at most 1 interface address per interface. 454 * Since IPv6 allows a node to assign multiple addresses 455 * on a single interface, we almost always look and check the 456 * presence of ifra_addr, and reject invalid ones here. 457 * It also decreases duplicated code among SIOC*_IN6 operations. 458 */ 459 switch (cmd) { 460 case SIOCAIFADDR_IN6: 461 #ifdef OSIOCAIFADDR_IN6 462 case OSIOCAIFADDR_IN6: 463 #endif 464 #ifdef OSIOCSIFPHYADDR_IN6 465 case OSIOCSIFPHYADDR_IN6: 466 #endif 467 case SIOCSIFPHYADDR_IN6: 468 sa6 = &ifra->ifra_addr; 469 break; 470 case SIOCSIFADDR_IN6: 471 case SIOCGIFADDR_IN6: 472 case SIOCSIFDSTADDR_IN6: 473 case SIOCSIFNETMASK_IN6: 474 case SIOCGIFDSTADDR_IN6: 475 case SIOCGIFNETMASK_IN6: 476 case SIOCDIFADDR_IN6: 477 case SIOCGIFPSRCADDR_IN6: 478 case SIOCGIFPDSTADDR_IN6: 479 case SIOCGIFAFLAG_IN6: 480 case SIOCSNDFLUSH_IN6: 481 case SIOCSPFXFLUSH_IN6: 482 case SIOCSRTRFLUSH_IN6: 483 case SIOCGIFALIFETIME_IN6: 484 #ifdef OSIOCGIFALIFETIME_IN6 485 case OSIOCGIFALIFETIME_IN6: 486 #endif 487 case SIOCGIFSTAT_IN6: 488 case SIOCGIFSTAT_ICMP6: 489 sa6 = &ifr->ifr_addr; 490 break; 491 default: 492 sa6 = NULL; 493 break; 494 } 495 496 error = 0; 497 bound = curlwp_bind(); 498 if (sa6 && sa6->sin6_family == AF_INET6) { 499 if (sa6->sin6_scope_id != 0) 500 error = sa6_embedscope(sa6, 0); 501 else 502 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 503 if (error != 0) 504 goto out; 505 ia = in6ifa_ifpwithaddr_psref(ifp, &sa6->sin6_addr, &psref); 506 } else 507 ia = NULL; 508 509 switch (cmd) { 510 case SIOCSIFADDR_IN6: 511 case SIOCSIFDSTADDR_IN6: 512 case SIOCSIFNETMASK_IN6: 513 /* 514 * Since IPv6 allows a node to assign multiple addresses 515 * on a single interface, SIOCSIFxxx ioctls are deprecated. 516 */ 517 error = EINVAL; 518 goto release; 519 520 case SIOCDIFADDR_IN6: 521 /* 522 * for IPv4, we look for existing in_ifaddr here to allow 523 * "ifconfig if0 delete" to remove the first IPv4 address on 524 * the interface. For IPv6, as the spec allows multiple 525 * interface address from the day one, we consider "remove the 526 * first one" semantics to be not preferable. 527 */ 528 if (ia == NULL) { 529 error = EADDRNOTAVAIL; 530 goto out; 531 } 532 /* FALLTHROUGH */ 533 #ifdef OSIOCAIFADDR_IN6 534 case OSIOCAIFADDR_IN6: 535 #endif 536 case SIOCAIFADDR_IN6: 537 /* 538 * We always require users to specify a valid IPv6 address for 539 * the corresponding operation. 540 */ 541 if (ifra->ifra_addr.sin6_family != AF_INET6 || 542 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 543 error = EAFNOSUPPORT; 544 goto release; 545 } 546 /* Privileged. */ 547 548 break; 549 550 case SIOCGIFADDR_IN6: 551 /* This interface is basically deprecated. use SIOCGIFCONF. */ 552 /* FALLTHROUGH */ 553 case SIOCGIFAFLAG_IN6: 554 case SIOCGIFNETMASK_IN6: 555 case SIOCGIFDSTADDR_IN6: 556 case SIOCGIFALIFETIME_IN6: 557 #ifdef OSIOCGIFALIFETIME_IN6 558 case OSIOCGIFALIFETIME_IN6: 559 #endif 560 /* must think again about its semantics */ 561 if (ia == NULL) { 562 error = EADDRNOTAVAIL; 563 goto out; 564 } 565 break; 566 } 567 568 switch (cmd) { 569 570 case SIOCGIFADDR_IN6: 571 ifr->ifr_addr = ia->ia_addr; 572 error = sa6_recoverscope(&ifr->ifr_addr); 573 break; 574 575 case SIOCGIFDSTADDR_IN6: 576 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 577 error = EINVAL; 578 break; 579 } 580 /* 581 * XXX: should we check if ifa_dstaddr is NULL and return 582 * an error? 583 */ 584 ifr->ifr_dstaddr = ia->ia_dstaddr; 585 error = sa6_recoverscope(&ifr->ifr_dstaddr); 586 break; 587 588 case SIOCGIFNETMASK_IN6: 589 ifr->ifr_addr = ia->ia_prefixmask; 590 break; 591 592 case SIOCGIFAFLAG_IN6: 593 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 594 break; 595 596 case SIOCGIFSTAT_IN6: 597 if (ifp == NULL) { 598 error = EINVAL; 599 break; 600 } 601 memset(&ifr->ifr_ifru.ifru_stat, 0, 602 sizeof(ifr->ifr_ifru.ifru_stat)); 603 ifr->ifr_ifru.ifru_stat = 604 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat; 605 break; 606 607 case SIOCGIFSTAT_ICMP6: 608 if (ifp == NULL) { 609 error = EINVAL; 610 break; 611 } 612 memset(&ifr->ifr_ifru.ifru_icmp6stat, 0, 613 sizeof(ifr->ifr_ifru.ifru_icmp6stat)); 614 ifr->ifr_ifru.ifru_icmp6stat = 615 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat; 616 break; 617 618 #ifdef OSIOCGIFALIFETIME_IN6 619 case OSIOCGIFALIFETIME_IN6: 620 #endif 621 case SIOCGIFALIFETIME_IN6: 622 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 623 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 624 time_t maxexpire; 625 struct in6_addrlifetime *retlt = 626 &ifr->ifr_ifru.ifru_lifetime; 627 628 /* 629 * XXX: adjust expiration time assuming time_t is 630 * signed. 631 */ 632 maxexpire = ((time_t)~0) & 633 ~((time_t)1 << ((sizeof(maxexpire) * NBBY) - 1)); 634 if (ia->ia6_lifetime.ia6t_vltime < 635 maxexpire - ia->ia6_updatetime) { 636 retlt->ia6t_expire = ia->ia6_updatetime + 637 ia->ia6_lifetime.ia6t_vltime; 638 retlt->ia6t_expire = retlt->ia6t_expire ? 639 time_mono_to_wall(retlt->ia6t_expire) : 640 0; 641 } else 642 retlt->ia6t_expire = maxexpire; 643 } 644 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 645 time_t maxexpire; 646 struct in6_addrlifetime *retlt = 647 &ifr->ifr_ifru.ifru_lifetime; 648 649 /* 650 * XXX: adjust expiration time assuming time_t is 651 * signed. 652 */ 653 maxexpire = ((time_t)~0) & 654 ~((time_t)1 << ((sizeof(maxexpire) * NBBY) - 1)); 655 if (ia->ia6_lifetime.ia6t_pltime < 656 maxexpire - ia->ia6_updatetime) { 657 retlt->ia6t_preferred = ia->ia6_updatetime + 658 ia->ia6_lifetime.ia6t_pltime; 659 retlt->ia6t_preferred = retlt->ia6t_preferred ? 660 time_mono_to_wall(retlt->ia6t_preferred) : 661 0; 662 } else 663 retlt->ia6t_preferred = maxexpire; 664 } 665 #ifdef OSIOCFIFALIFETIME_IN6 666 if (cmd == OSIOCFIFALIFETIME_IN6) 667 in6_addrlifetime_to_in6_addrlifetime50( 668 &ifr->ifru.ifru_lifetime); 669 #endif 670 break; 671 672 #ifdef OSIOCAIFADDR_IN6 673 case OSIOCAIFADDR_IN6: 674 in6_aliasreq50_to_in6_aliasreq(ifra); 675 /*FALLTHROUGH*/ 676 #endif 677 case SIOCAIFADDR_IN6: 678 { 679 struct in6_addrlifetime *lt; 680 681 /* reject read-only flags */ 682 if ((ifra->ifra_flags & IN6_IFF_DUPLICATED) != 0 || 683 (ifra->ifra_flags & IN6_IFF_DETACHED) != 0 || 684 (ifra->ifra_flags & IN6_IFF_TENTATIVE) != 0 || 685 (ifra->ifra_flags & IN6_IFF_NODAD) != 0 || 686 (ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0) { 687 error = EINVAL; 688 break; 689 } 690 /* 691 * ia6t_expire and ia6t_preferred won't be used for now, 692 * so just in case. 693 */ 694 lt = &ifra->ifra_lifetime; 695 if (lt->ia6t_expire != 0) 696 lt->ia6t_expire = time_wall_to_mono(lt->ia6t_expire); 697 if (lt->ia6t_preferred != 0) 698 lt->ia6t_preferred = 699 time_wall_to_mono(lt->ia6t_preferred); 700 /* 701 * make (ia == NULL) or update (ia != NULL) the interface 702 * address structure, and link it to the list. 703 */ 704 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 705 break; 706 run_hooks = true; 707 break; 708 } 709 710 case SIOCDIFADDR_IN6: 711 { 712 struct nd_prefix *pr; 713 714 /* 715 * If the address being deleted is the only one that owns 716 * the corresponding prefix, expire the prefix as well. 717 * Note that in6_purgeaddr() will decrement ndpr_refcnt. 718 */ 719 pr = ia->ia6_ndpr; 720 ia6_release(ia, &psref); 721 in6_purgeaddr(&ia->ia_ifa); 722 ia = NULL; 723 if (pr && pr->ndpr_refcnt == 0) 724 prelist_remove(pr); 725 run_hooks = true; 726 break; 727 } 728 729 default: 730 error = ENOTTY; 731 } 732 release: 733 ia6_release(ia, &psref); 734 735 if (run_hooks) 736 pfil_run_hooks(if_pfil, (struct mbuf **)cmd, ifp, PFIL_IFADDR); 737 out: 738 curlwp_bindx(bound); 739 return error; 740 } 741 742 int 743 in6_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp) 744 { 745 int error, s; 746 747 switch (cmd) { 748 case SIOCSNDFLUSH_IN6: 749 case SIOCSPFXFLUSH_IN6: 750 case SIOCSRTRFLUSH_IN6: 751 case SIOCSDEFIFACE_IN6: 752 case SIOCSIFINFO_FLAGS: 753 case SIOCSIFINFO_IN6: 754 755 case SIOCALIFADDR: 756 case SIOCDLIFADDR: 757 758 case SIOCDIFADDR_IN6: 759 #ifdef OSIOCAIFADDR_IN6 760 case OSIOCAIFADDR_IN6: 761 #endif 762 case SIOCAIFADDR_IN6: 763 764 case SIOCAADDRCTL_POLICY: 765 case SIOCDADDRCTL_POLICY: 766 767 if (kauth_authorize_network(curlwp->l_cred, 768 KAUTH_NETWORK_SOCKET, 769 KAUTH_REQ_NETWORK_SOCKET_SETPRIV, 770 so, NULL, NULL)) 771 return EPERM; 772 break; 773 } 774 775 s = splnet(); 776 mutex_enter(softnet_lock); 777 error = in6_control1(so , cmd, data, ifp); 778 mutex_exit(softnet_lock); 779 splx(s); 780 return error; 781 } 782 783 /* 784 * Update parameters of an IPv6 interface address. 785 * If necessary, a new entry is created and linked into address chains. 786 * This function is separated from in6_control(). 787 * XXX: should this be performed under splnet()? 788 */ 789 static int 790 in6_update_ifa1(struct ifnet *ifp, struct in6_aliasreq *ifra, 791 struct in6_ifaddr *ia, int flags) 792 { 793 int error = 0, hostIsNew = 0, plen = -1; 794 struct sockaddr_in6 dst6; 795 struct in6_addrlifetime *lt; 796 struct in6_multi_mship *imm; 797 struct in6_multi *in6m_sol; 798 struct rtentry *rt; 799 int dad_delay, was_tentative; 800 801 in6m_sol = NULL; 802 803 /* Validate parameters */ 804 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 805 return EINVAL; 806 807 /* 808 * The destination address for a p2p link must have a family 809 * of AF_UNSPEC or AF_INET6. 810 */ 811 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 812 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 813 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 814 return EAFNOSUPPORT; 815 /* 816 * validate ifra_prefixmask. don't check sin6_family, netmask 817 * does not carry fields other than sin6_len. 818 */ 819 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 820 return EINVAL; 821 /* 822 * Because the IPv6 address architecture is classless, we require 823 * users to specify a (non 0) prefix length (mask) for a new address. 824 * We also require the prefix (when specified) mask is valid, and thus 825 * reject a non-consecutive mask. 826 */ 827 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 828 return EINVAL; 829 if (ifra->ifra_prefixmask.sin6_len != 0) { 830 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 831 (u_char *)&ifra->ifra_prefixmask + 832 ifra->ifra_prefixmask.sin6_len); 833 if (plen <= 0) 834 return EINVAL; 835 } else { 836 /* 837 * In this case, ia must not be NULL. We just use its prefix 838 * length. 839 */ 840 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 841 } 842 /* 843 * If the destination address on a p2p interface is specified, 844 * and the address is a scoped one, validate/set the scope 845 * zone identifier. 846 */ 847 dst6 = ifra->ifra_dstaddr; 848 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 849 (dst6.sin6_family == AF_INET6)) { 850 struct in6_addr in6_tmp; 851 u_int32_t zoneid; 852 853 in6_tmp = dst6.sin6_addr; 854 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 855 return EINVAL; /* XXX: should be impossible */ 856 857 if (dst6.sin6_scope_id != 0) { 858 if (dst6.sin6_scope_id != zoneid) 859 return EINVAL; 860 } else /* user omit to specify the ID. */ 861 dst6.sin6_scope_id = zoneid; 862 863 /* convert into the internal form */ 864 if (sa6_embedscope(&dst6, 0)) 865 return EINVAL; /* XXX: should be impossible */ 866 } 867 /* 868 * The destination address can be specified only for a p2p or a 869 * loopback interface. If specified, the corresponding prefix length 870 * must be 128. 871 */ 872 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 873 #ifdef FORCE_P2PPLEN 874 int i; 875 #endif 876 877 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 878 /* XXX: noisy message */ 879 nd6log(LOG_INFO, "a destination can " 880 "be specified for a p2p or a loopback IF only\n"); 881 return EINVAL; 882 } 883 if (plen != 128) { 884 nd6log(LOG_INFO, "prefixlen should " 885 "be 128 when dstaddr is specified\n"); 886 #ifdef FORCE_P2PPLEN 887 /* 888 * To be compatible with old configurations, 889 * such as ifconfig gif0 inet6 2001::1 2001::2 890 * prefixlen 126, we override the specified 891 * prefixmask as if the prefix length was 128. 892 */ 893 ifra->ifra_prefixmask.sin6_len = 894 sizeof(struct sockaddr_in6); 895 for (i = 0; i < 4; i++) 896 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i] = 897 0xffffffff; 898 plen = 128; 899 #else 900 return EINVAL; 901 #endif 902 } 903 } 904 /* lifetime consistency check */ 905 lt = &ifra->ifra_lifetime; 906 if (lt->ia6t_pltime > lt->ia6t_vltime) 907 return EINVAL; 908 if (lt->ia6t_vltime == 0) { 909 /* 910 * the following log might be noisy, but this is a typical 911 * configuration mistake or a tool's bug. 912 */ 913 nd6log(LOG_INFO, "valid lifetime is 0 for %s\n", 914 ip6_sprintf(&ifra->ifra_addr.sin6_addr)); 915 916 if (ia == NULL) 917 return 0; /* there's nothing to do */ 918 } 919 920 /* 921 * If this is a new address, allocate a new ifaddr and link it 922 * into chains. 923 */ 924 if (ia == NULL) { 925 hostIsNew = 1; 926 /* 927 * When in6_update_ifa() is called in a process of a received 928 * RA, it is called under an interrupt context. So, we should 929 * call malloc with M_NOWAIT. 930 */ 931 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR, 932 M_NOWAIT); 933 if (ia == NULL) 934 return ENOBUFS; 935 memset(ia, 0, sizeof(*ia)); 936 LIST_INIT(&ia->ia6_memberships); 937 /* Initialize the address and masks, and put time stamp */ 938 ia->ia_ifa.ifa_addr = sin6tosa(&ia->ia_addr); 939 ia->ia_addr.sin6_family = AF_INET6; 940 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 941 ia->ia6_createtime = time_uptime; 942 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 943 /* 944 * XXX: some functions expect that ifa_dstaddr is not 945 * NULL for p2p interfaces. 946 */ 947 ia->ia_ifa.ifa_dstaddr = sin6tosa(&ia->ia_dstaddr); 948 } else { 949 ia->ia_ifa.ifa_dstaddr = NULL; 950 } 951 ia->ia_ifa.ifa_netmask = sin6tosa(&ia->ia_prefixmask); 952 953 ia->ia_ifp = ifp; 954 IN6_ADDRLIST_ENTRY_INIT(ia); 955 ifa_psref_init(&ia->ia_ifa); 956 } 957 958 /* update timestamp */ 959 ia->ia6_updatetime = time_uptime; 960 961 /* set prefix mask */ 962 if (ifra->ifra_prefixmask.sin6_len) { 963 if (ia->ia_prefixmask.sin6_len) { 964 /* 965 * We prohibit changing the prefix length of an 966 * existing autoconf address, because the operation 967 * would confuse prefix management. 968 */ 969 if (ia->ia6_ndpr != NULL && 970 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != 971 plen) 972 { 973 nd6log(LOG_INFO, "the prefix length of an" 974 " existing (%s) autoconf address should" 975 " not be changed\n", 976 ip6_sprintf(&ia->ia_addr.sin6_addr)); 977 error = EINVAL; 978 if (hostIsNew) 979 free(ia, M_IFADDR); 980 goto exit; 981 } 982 983 if (!IN6_ARE_ADDR_EQUAL(&ia->ia_prefixmask.sin6_addr, 984 &ifra->ifra_prefixmask.sin6_addr)) 985 in6_ifremprefix(ia); 986 } 987 ia->ia_prefixmask = ifra->ifra_prefixmask; 988 } 989 990 /* Set destination address. */ 991 if (dst6.sin6_family == AF_INET6) { 992 if (!IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, 993 &ia->ia_dstaddr.sin6_addr)) 994 in6_ifremprefix(ia); 995 ia->ia_dstaddr = dst6; 996 } 997 998 /* 999 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1000 * to see if the address is deprecated or invalidated, but initialize 1001 * these members for applications. 1002 */ 1003 ia->ia6_lifetime = ifra->ifra_lifetime; 1004 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1005 ia->ia6_lifetime.ia6t_expire = 1006 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1007 } else 1008 ia->ia6_lifetime.ia6t_expire = 0; 1009 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1010 ia->ia6_lifetime.ia6t_preferred = 1011 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1012 } else 1013 ia->ia6_lifetime.ia6t_preferred = 0; 1014 1015 /* 1016 * configure address flags. 1017 * We need to preserve tentative state so DAD works if 1018 * something adds the same address before DAD finishes. 1019 */ 1020 was_tentative = ia->ia6_flags & (IN6_IFF_TENTATIVE|IN6_IFF_DUPLICATED); 1021 ia->ia6_flags = ifra->ifra_flags; 1022 1023 /* 1024 * Make the address tentative before joining multicast addresses, 1025 * so that corresponding MLD responses would not have a tentative 1026 * source address. 1027 */ 1028 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1029 if (ifp->if_link_state == LINK_STATE_DOWN) { 1030 ia->ia6_flags |= IN6_IFF_DETACHED; 1031 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1032 } else if ((hostIsNew || was_tentative) && if_do_dad(ifp)) 1033 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1034 1035 /* 1036 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1037 * userland, make it deprecated. 1038 */ 1039 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1040 ia->ia6_lifetime.ia6t_pltime = 0; 1041 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1042 } 1043 1044 /* reset the interface and routing table appropriately. */ 1045 error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew); 1046 if (error != 0) { 1047 if (hostIsNew) 1048 free(ia, M_IFADDR); 1049 goto exit; 1050 } 1051 1052 /* 1053 * We are done if we have simply modified an existing address. 1054 */ 1055 if (!hostIsNew) 1056 return error; 1057 1058 /* 1059 * Insert ia to the global list and ifa to the interface's list. 1060 */ 1061 mutex_enter(&in6_ifaddr_lock); 1062 IN6_ADDRLIST_WRITER_INSERT_TAIL(ia); 1063 mutex_exit(&in6_ifaddr_lock); 1064 1065 /* gain a refcnt for the link from in6_ifaddr */ 1066 ifaref(&ia->ia_ifa); 1067 ifa_insert(ifp, &ia->ia_ifa); 1068 1069 /* 1070 * Beyond this point, we should call in6_purgeaddr upon an error, 1071 * not just go to unlink. 1072 */ 1073 1074 /* join necessary multicast groups */ 1075 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1076 struct sockaddr_in6 mltaddr, mltmask; 1077 struct in6_addr llsol; 1078 1079 /* join solicited multicast addr for new host id */ 1080 memset(&llsol, 0, sizeof(struct in6_addr)); 1081 llsol.s6_addr16[0] = htons(0xff02); 1082 llsol.s6_addr32[1] = 0; 1083 llsol.s6_addr32[2] = htonl(1); 1084 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 1085 llsol.s6_addr8[12] = 0xff; 1086 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) { 1087 /* XXX: should not happen */ 1088 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 1089 goto cleanup; 1090 } 1091 dad_delay = 0; 1092 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1093 /* 1094 * We need a random delay for DAD on the address 1095 * being configured. It also means delaying 1096 * transmission of the corresponding MLD report to 1097 * avoid report collision. 1098 * [draft-ietf-ipv6-rfc2462bis-02.txt] 1099 */ 1100 dad_delay = cprng_fast32() % 1101 (MAX_RTR_SOLICITATION_DELAY * hz); 1102 } 1103 1104 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */ 1105 /* join solicited multicast addr for new host id */ 1106 imm = in6_joingroup(ifp, &llsol, &error, dad_delay); 1107 if (!imm) { 1108 nd6log(LOG_ERR, 1109 "addmulti failed for %s on %s (errno=%d)\n", 1110 ip6_sprintf(&llsol), if_name(ifp), error); 1111 goto cleanup; 1112 } 1113 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1114 in6m_sol = imm->i6mm_maddr; 1115 1116 sockaddr_in6_init(&mltmask, &in6mask32, 0, 0, 0); 1117 1118 /* 1119 * join link-local all-nodes address 1120 */ 1121 sockaddr_in6_init(&mltaddr, &in6addr_linklocal_allnodes, 1122 0, 0, 0); 1123 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1124 goto cleanup; /* XXX: should not fail */ 1125 1126 /* 1127 * XXX: do we really need this automatic routes? 1128 * We should probably reconsider this stuff. Most applications 1129 * actually do not need the routes, since they usually specify 1130 * the outgoing interface. 1131 */ 1132 rt = rtalloc1(sin6tosa(&mltaddr), 0); 1133 if (rt) { 1134 if (memcmp(&mltaddr.sin6_addr, 1135 &satocsin6(rt_getkey(rt))->sin6_addr, 1136 MLTMASK_LEN)) { 1137 rtfree(rt); 1138 rt = NULL; 1139 } else if (rt->rt_ifp != ifp) { 1140 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 1141 "network %04x:%04x::/32 = %04x:%04x::/32\n", 1142 __func__, rt->rt_ifp, ifp, ifp->if_xname, 1143 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 1144 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 1145 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 1146 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 1147 rt_replace_ifa(rt, &ia->ia_ifa); 1148 rt->rt_ifp = ifp; 1149 } 1150 } 1151 if (!rt) { 1152 struct rt_addrinfo info; 1153 1154 memset(&info, 0, sizeof(info)); 1155 info.rti_info[RTAX_DST] = sin6tosa(&mltaddr); 1156 info.rti_info[RTAX_GATEWAY] = sin6tosa(&ia->ia_addr); 1157 info.rti_info[RTAX_NETMASK] = sin6tosa(&mltmask); 1158 info.rti_info[RTAX_IFA] = sin6tosa(&ia->ia_addr); 1159 /* XXX: we need RTF_CONNECTED to fake nd6_rtrequest */ 1160 info.rti_flags = RTF_UP | RTF_CONNECTED; 1161 error = rtrequest1(RTM_ADD, &info, NULL); 1162 if (error) 1163 goto cleanup; 1164 } else { 1165 rtfree(rt); 1166 } 1167 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1168 if (!imm) { 1169 nd6log(LOG_WARNING, 1170 "addmulti failed for %s on %s (errno=%d)\n", 1171 ip6_sprintf(&mltaddr.sin6_addr), 1172 if_name(ifp), error); 1173 goto cleanup; 1174 } 1175 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1176 1177 /* 1178 * join node information group address 1179 */ 1180 dad_delay = 0; 1181 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1182 /* 1183 * The spec doesn't say anything about delay for this 1184 * group, but the same logic should apply. 1185 */ 1186 dad_delay = cprng_fast32() % 1187 (MAX_RTR_SOLICITATION_DELAY * hz); 1188 } 1189 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr) != 0) 1190 ; 1191 else if ((imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 1192 dad_delay)) == NULL) { /* XXX jinmei */ 1193 nd6log(LOG_WARNING, 1194 "addmulti failed for %s on %s (errno=%d)\n", 1195 ip6_sprintf(&mltaddr.sin6_addr), 1196 if_name(ifp), error); 1197 /* XXX not very fatal, go on... */ 1198 } else { 1199 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1200 } 1201 1202 1203 /* 1204 * join interface-local all-nodes address. 1205 * (ff01::1%ifN, and ff01::%ifN/32) 1206 */ 1207 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1208 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1209 goto cleanup; /* XXX: should not fail */ 1210 1211 /* XXX: again, do we really need the route? */ 1212 rt = rtalloc1(sin6tosa(&mltaddr), 0); 1213 if (rt) { 1214 /* 32bit came from "mltmask" */ 1215 if (memcmp(&mltaddr.sin6_addr, 1216 &satocsin6(rt_getkey(rt))->sin6_addr, 1217 32 / NBBY)) { 1218 rtfree(rt); 1219 rt = NULL; 1220 } else if (rt->rt_ifp != ifp) { 1221 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 1222 "network %04x:%04x::/32 = %04x:%04x::/32\n", 1223 __func__, rt->rt_ifp, ifp, ifp->if_xname, 1224 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 1225 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 1226 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 1227 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 1228 rt_replace_ifa(rt, &ia->ia_ifa); 1229 rt->rt_ifp = ifp; 1230 } 1231 } 1232 if (!rt) { 1233 struct rt_addrinfo info; 1234 1235 memset(&info, 0, sizeof(info)); 1236 info.rti_info[RTAX_DST] = sin6tosa(&mltaddr); 1237 info.rti_info[RTAX_GATEWAY] = sin6tosa(&ia->ia_addr); 1238 info.rti_info[RTAX_NETMASK] = sin6tosa(&mltmask); 1239 info.rti_info[RTAX_IFA] = sin6tosa(&ia->ia_addr); 1240 info.rti_flags = RTF_UP | RTF_CONNECTED; 1241 error = rtrequest1(RTM_ADD, &info, NULL); 1242 if (error) 1243 goto cleanup; 1244 #undef MLTMASK_LEN 1245 } else { 1246 rtfree(rt); 1247 } 1248 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1249 if (!imm) { 1250 nd6log(LOG_WARNING, 1251 "addmulti failed for %s on %s (errno=%d)\n", 1252 ip6_sprintf(&mltaddr.sin6_addr), 1253 if_name(ifp), error); 1254 goto cleanup; 1255 } else { 1256 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1257 } 1258 } 1259 1260 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1261 error = nd6_add_ifa_lle(ia); 1262 if (error != 0) 1263 goto cleanup; 1264 1265 /* 1266 * Perform DAD, if needed. 1267 * XXX It may be of use, if we can administratively 1268 * disable DAD. 1269 */ 1270 if (hostIsNew && if_do_dad(ifp) && 1271 ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && 1272 (ia->ia6_flags & IN6_IFF_TENTATIVE)) 1273 { 1274 int mindelay, maxdelay; 1275 1276 dad_delay = 0; 1277 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1278 /* 1279 * We need to impose a delay before sending an NS 1280 * for DAD. Check if we also needed a delay for the 1281 * corresponding MLD message. If we did, the delay 1282 * should be larger than the MLD delay (this could be 1283 * relaxed a bit, but this simple logic is at least 1284 * safe). 1285 */ 1286 mindelay = 0; 1287 if (in6m_sol != NULL && 1288 in6m_sol->in6m_state == MLD_REPORTPENDING) { 1289 mindelay = in6m_sol->in6m_timer; 1290 } 1291 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1292 if (maxdelay - mindelay == 0) 1293 dad_delay = 0; 1294 else { 1295 dad_delay = 1296 (cprng_fast32() % (maxdelay - mindelay)) + 1297 mindelay; 1298 } 1299 } 1300 /* +1 ensures callout is always used */ 1301 nd6_dad_start(&ia->ia_ifa, dad_delay + 1); 1302 } 1303 1304 return 0; 1305 1306 cleanup: 1307 in6_purgeaddr(&ia->ia_ifa); 1308 exit: 1309 return error; 1310 } 1311 1312 int 1313 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1314 struct in6_ifaddr *ia, int flags) 1315 { 1316 int rc, s; 1317 1318 s = splnet(); 1319 rc = in6_update_ifa1(ifp, ifra, ia, flags); 1320 splx(s); 1321 return rc; 1322 } 1323 1324 void 1325 in6_purgeaddr(struct ifaddr *ifa) 1326 { 1327 struct ifnet *ifp = ifa->ifa_ifp; 1328 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1329 struct in6_multi_mship *imm; 1330 1331 /* stop DAD processing */ 1332 nd6_dad_stop(ifa); 1333 1334 /* Delete any network route. */ 1335 in6_ifremprefix(ia); 1336 1337 /* Remove ownaddr's loopback rtentry, if it exists. */ 1338 in6_ifremlocal(&(ia->ia_ifa)); 1339 1340 /* 1341 * leave from multicast groups we have joined for the interface 1342 */ 1343 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1344 LIST_REMOVE(imm, i6mm_chain); 1345 in6_leavegroup(imm); 1346 } 1347 1348 in6_unlink_ifa(ia, ifp); 1349 } 1350 1351 static void 1352 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1353 { 1354 int s = splnet(); 1355 1356 mutex_enter(&in6_ifaddr_lock); 1357 IN6_ADDRLIST_WRITER_REMOVE(ia); 1358 ifa_remove(ifp, &ia->ia_ifa); 1359 mutex_exit(&in6_ifaddr_lock); 1360 1361 /* 1362 * XXX thorpej@NetBSD.org -- if the interface is going 1363 * XXX away, don't save the multicast entries, delete them! 1364 */ 1365 if (LIST_EMPTY(&ia->ia6_multiaddrs)) 1366 ; 1367 else if (if_is_deactivated(ia->ia_ifa.ifa_ifp)) { 1368 struct in6_multi *in6m, *next; 1369 1370 for (in6m = LIST_FIRST(&ia->ia6_multiaddrs); in6m != NULL; 1371 in6m = next) { 1372 next = LIST_NEXT(in6m, in6m_entry); 1373 in6_delmulti(in6m); 1374 } 1375 } else 1376 in6_savemkludge(ia); 1377 1378 /* 1379 * Release the reference to the ND prefix. 1380 */ 1381 if (ia->ia6_ndpr != NULL) { 1382 ia->ia6_ndpr->ndpr_refcnt--; 1383 ia->ia6_ndpr = NULL; 1384 } 1385 1386 /* 1387 * Also, if the address being removed is autoconf'ed, call 1388 * pfxlist_onlink_check() since the release might affect the status of 1389 * other (detached) addresses. 1390 */ 1391 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) != 0) 1392 pfxlist_onlink_check(); 1393 1394 IN6_ADDRLIST_ENTRY_DESTROY(ia); 1395 1396 /* 1397 * release another refcnt for the link from in6_ifaddr. 1398 * Note that we should decrement the refcnt at least once for all *BSD. 1399 */ 1400 ifafree(&ia->ia_ifa); 1401 1402 splx(s); 1403 } 1404 1405 void 1406 in6_purgeif(struct ifnet *ifp) 1407 { 1408 1409 in6_ifdetach(ifp); 1410 } 1411 1412 /* 1413 * SIOC[GAD]LIFADDR. 1414 * SIOCGLIFADDR: get first address. (?) 1415 * SIOCGLIFADDR with IFLR_PREFIX: 1416 * get first address that matches the specified prefix. 1417 * SIOCALIFADDR: add the specified address. 1418 * SIOCALIFADDR with IFLR_PREFIX: 1419 * add the specified prefix, filling hostid part from 1420 * the first link-local address. prefixlen must be <= 64. 1421 * SIOCDLIFADDR: delete the specified address. 1422 * SIOCDLIFADDR with IFLR_PREFIX: 1423 * delete the first address that matches the specified prefix. 1424 * return values: 1425 * EINVAL on invalid parameters 1426 * EADDRNOTAVAIL on prefix match failed/specified address not found 1427 * other values may be returned from in6_ioctl() 1428 * 1429 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1430 * this is to accommodate address naming scheme other than RFC2374, 1431 * in the future. 1432 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1433 * address encoding scheme. (see figure on page 8) 1434 */ 1435 static int 1436 in6_lifaddr_ioctl(struct socket *so, u_long cmd, void *data, 1437 struct ifnet *ifp) 1438 { 1439 struct in6_ifaddr *ia = NULL; /* XXX gcc 4.8 maybe-uninitialized */ 1440 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1441 struct ifaddr *ifa; 1442 struct sockaddr *sa; 1443 1444 /* sanity checks */ 1445 if (!data || !ifp) { 1446 panic("invalid argument to in6_lifaddr_ioctl"); 1447 /* NOTREACHED */ 1448 } 1449 1450 switch (cmd) { 1451 case SIOCGLIFADDR: 1452 /* address must be specified on GET with IFLR_PREFIX */ 1453 if ((iflr->flags & IFLR_PREFIX) == 0) 1454 break; 1455 /* FALLTHROUGH */ 1456 case SIOCALIFADDR: 1457 case SIOCDLIFADDR: 1458 /* address must be specified on ADD and DELETE */ 1459 sa = (struct sockaddr *)&iflr->addr; 1460 if (sa->sa_family != AF_INET6) 1461 return EINVAL; 1462 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1463 return EINVAL; 1464 /* XXX need improvement */ 1465 sa = (struct sockaddr *)&iflr->dstaddr; 1466 if (sa->sa_family && sa->sa_family != AF_INET6) 1467 return EINVAL; 1468 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1469 return EINVAL; 1470 break; 1471 default: /* shouldn't happen */ 1472 #if 0 1473 panic("invalid cmd to in6_lifaddr_ioctl"); 1474 /* NOTREACHED */ 1475 #else 1476 return EOPNOTSUPP; 1477 #endif 1478 } 1479 if (sizeof(struct in6_addr) * NBBY < iflr->prefixlen) 1480 return EINVAL; 1481 1482 switch (cmd) { 1483 case SIOCALIFADDR: 1484 { 1485 struct in6_aliasreq ifra; 1486 struct in6_addr *xhostid = NULL; 1487 int prefixlen; 1488 int bound = curlwp_bind(); 1489 struct psref psref; 1490 1491 if ((iflr->flags & IFLR_PREFIX) != 0) { 1492 struct sockaddr_in6 *sin6; 1493 1494 /* 1495 * xhostid is to fill in the hostid part of the 1496 * address. xhostid points to the first link-local 1497 * address attached to the interface. 1498 */ 1499 ia = in6ifa_ifpforlinklocal_psref(ifp, 0, &psref); 1500 if (ia == NULL) { 1501 curlwp_bindx(bound); 1502 return EADDRNOTAVAIL; 1503 } 1504 xhostid = IFA_IN6(&ia->ia_ifa); 1505 1506 /* prefixlen must be <= 64. */ 1507 if (64 < iflr->prefixlen) { 1508 ia6_release(ia, &psref); 1509 curlwp_bindx(bound); 1510 return EINVAL; 1511 } 1512 prefixlen = iflr->prefixlen; 1513 1514 /* hostid part must be zero. */ 1515 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1516 if (sin6->sin6_addr.s6_addr32[2] != 0 1517 || sin6->sin6_addr.s6_addr32[3] != 0) { 1518 ia6_release(ia, &psref); 1519 curlwp_bindx(bound); 1520 return EINVAL; 1521 } 1522 } else 1523 prefixlen = iflr->prefixlen; 1524 1525 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1526 memset(&ifra, 0, sizeof(ifra)); 1527 memcpy(ifra.ifra_name, iflr->iflr_name, sizeof(ifra.ifra_name)); 1528 1529 memcpy(&ifra.ifra_addr, &iflr->addr, 1530 ((struct sockaddr *)&iflr->addr)->sa_len); 1531 if (xhostid) { 1532 /* fill in hostid part */ 1533 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1534 xhostid->s6_addr32[2]; 1535 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1536 xhostid->s6_addr32[3]; 1537 } 1538 1539 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1540 memcpy(&ifra.ifra_dstaddr, &iflr->dstaddr, 1541 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1542 if (xhostid) { 1543 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1544 xhostid->s6_addr32[2]; 1545 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1546 xhostid->s6_addr32[3]; 1547 } 1548 } 1549 if (xhostid) { 1550 ia6_release(ia, &psref); 1551 ia = NULL; 1552 } 1553 curlwp_bindx(bound); 1554 1555 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1556 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1557 1558 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 1559 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 1560 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1561 return in6_control(so, SIOCAIFADDR_IN6, &ifra, ifp); 1562 } 1563 case SIOCGLIFADDR: 1564 case SIOCDLIFADDR: 1565 { 1566 struct in6_addr mask, candidate, match; 1567 struct sockaddr_in6 *sin6; 1568 int cmp; 1569 int error, s; 1570 1571 memset(&mask, 0, sizeof(mask)); 1572 if (iflr->flags & IFLR_PREFIX) { 1573 /* lookup a prefix rather than address. */ 1574 in6_prefixlen2mask(&mask, iflr->prefixlen); 1575 1576 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1577 memcpy(&match, &sin6->sin6_addr, sizeof(match)); 1578 match.s6_addr32[0] &= mask.s6_addr32[0]; 1579 match.s6_addr32[1] &= mask.s6_addr32[1]; 1580 match.s6_addr32[2] &= mask.s6_addr32[2]; 1581 match.s6_addr32[3] &= mask.s6_addr32[3]; 1582 1583 /* if you set extra bits, that's wrong */ 1584 if (memcmp(&match, &sin6->sin6_addr, sizeof(match))) 1585 return EINVAL; 1586 1587 cmp = 1; 1588 } else { 1589 if (cmd == SIOCGLIFADDR) { 1590 /* on getting an address, take the 1st match */ 1591 cmp = 0; /* XXX */ 1592 } else { 1593 /* on deleting an address, do exact match */ 1594 in6_prefixlen2mask(&mask, 128); 1595 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1596 memcpy(&match, &sin6->sin6_addr, sizeof(match)); 1597 1598 cmp = 1; 1599 } 1600 } 1601 1602 s = pserialize_read_enter(); 1603 IFADDR_READER_FOREACH(ifa, ifp) { 1604 if (ifa->ifa_addr->sa_family != AF_INET6) 1605 continue; 1606 if (!cmp) 1607 break; 1608 1609 /* 1610 * XXX: this is adhoc, but is necessary to allow 1611 * a user to specify fe80::/64 (not /10) for a 1612 * link-local address. 1613 */ 1614 memcpy(&candidate, IFA_IN6(ifa), sizeof(candidate)); 1615 in6_clearscope(&candidate); 1616 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1617 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1618 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1619 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1620 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1621 break; 1622 } 1623 if (!ifa) { 1624 error = EADDRNOTAVAIL; 1625 goto error; 1626 } 1627 ia = ifa2ia6(ifa); 1628 1629 if (cmd == SIOCGLIFADDR) { 1630 /* fill in the if_laddrreq structure */ 1631 memcpy(&iflr->addr, &ia->ia_addr, ia->ia_addr.sin6_len); 1632 error = sa6_recoverscope( 1633 (struct sockaddr_in6 *)&iflr->addr); 1634 if (error != 0) 1635 goto error; 1636 1637 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1638 memcpy(&iflr->dstaddr, &ia->ia_dstaddr, 1639 ia->ia_dstaddr.sin6_len); 1640 error = sa6_recoverscope( 1641 (struct sockaddr_in6 *)&iflr->dstaddr); 1642 if (error != 0) 1643 goto error; 1644 } else 1645 memset(&iflr->dstaddr, 0, sizeof(iflr->dstaddr)); 1646 1647 iflr->prefixlen = 1648 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1649 1650 iflr->flags = ia->ia6_flags; /* XXX */ 1651 1652 error = 0; 1653 } else { 1654 struct in6_aliasreq ifra; 1655 1656 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1657 memset(&ifra, 0, sizeof(ifra)); 1658 memcpy(ifra.ifra_name, iflr->iflr_name, 1659 sizeof(ifra.ifra_name)); 1660 1661 memcpy(&ifra.ifra_addr, &ia->ia_addr, 1662 ia->ia_addr.sin6_len); 1663 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1664 memcpy(&ifra.ifra_dstaddr, &ia->ia_dstaddr, 1665 ia->ia_dstaddr.sin6_len); 1666 } else { 1667 memset(&ifra.ifra_dstaddr, 0, 1668 sizeof(ifra.ifra_dstaddr)); 1669 } 1670 memcpy(&ifra.ifra_dstaddr, &ia->ia_prefixmask, 1671 ia->ia_prefixmask.sin6_len); 1672 1673 ifra.ifra_flags = ia->ia6_flags; 1674 pserialize_read_exit(s); 1675 1676 return in6_control(so, SIOCDIFADDR_IN6, &ifra, ifp); 1677 } 1678 error: 1679 pserialize_read_exit(s); 1680 return error; 1681 } 1682 } 1683 1684 return EOPNOTSUPP; /* just for safety */ 1685 } 1686 1687 /* 1688 * Initialize an interface's internet6 address 1689 * and routing table entry. 1690 */ 1691 static int 1692 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1693 const struct sockaddr_in6 *sin6, int newhost) 1694 { 1695 int error = 0, ifacount = 0; 1696 int s = splnet(); 1697 struct ifaddr *ifa; 1698 1699 /* 1700 * Give the interface a chance to initialize 1701 * if this is its first address, 1702 * and to validate the address if necessary. 1703 */ 1704 IFADDR_READER_FOREACH(ifa, ifp) { 1705 if (ifa->ifa_addr->sa_family != AF_INET6) 1706 continue; 1707 ifacount++; 1708 } 1709 1710 ia->ia_addr = *sin6; 1711 1712 if (ifacount <= 0 && 1713 (error = if_addr_init(ifp, &ia->ia_ifa, true)) != 0) { 1714 splx(s); 1715 return error; 1716 } 1717 splx(s); 1718 1719 ia->ia_ifa.ifa_metric = ifp->if_metric; 1720 1721 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1722 1723 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1724 if (newhost) { 1725 /* set the rtrequest function to create llinfo */ 1726 if (ifp->if_flags & IFF_POINTOPOINT) 1727 ia->ia_ifa.ifa_rtrequest = p2p_rtrequest; 1728 else if ((ifp->if_flags & IFF_LOOPBACK) == 0) 1729 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1730 in6_ifaddlocal(&ia->ia_ifa); 1731 } else { 1732 /* Inform the routing socket of new flags/timings */ 1733 rt_newaddrmsg(RTM_NEWADDR, &ia->ia_ifa, 0, NULL); 1734 } 1735 1736 /* Add the network prefix route. */ 1737 if ((error = in6_ifaddprefix(ia)) != 0) { 1738 if (newhost) 1739 in6_ifremlocal(&ia->ia_ifa); 1740 return error; 1741 } 1742 1743 if (ifp->if_flags & IFF_MULTICAST) 1744 in6_restoremkludge(ia, ifp); 1745 1746 return error; 1747 } 1748 1749 static struct ifaddr * 1750 bestifa(struct ifaddr *best_ifa, struct ifaddr *ifa) 1751 { 1752 if (best_ifa == NULL || best_ifa->ifa_preference < ifa->ifa_preference) 1753 return ifa; 1754 return best_ifa; 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 *best_ifa = NULL, *ifa; 1764 1765 IFADDR_READER_FOREACH(ifa, ifp) { 1766 if (ifa->ifa_addr->sa_family != AF_INET6) 1767 continue; 1768 if (!IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) 1769 continue; 1770 if ((((struct in6_ifaddr *)ifa)->ia6_flags & ignoreflags) != 0) 1771 continue; 1772 best_ifa = bestifa(best_ifa, ifa); 1773 } 1774 1775 return (struct in6_ifaddr *)best_ifa; 1776 } 1777 1778 struct in6_ifaddr * 1779 in6ifa_ifpforlinklocal_psref(const struct ifnet *ifp, const int ignoreflags, 1780 struct psref *psref) 1781 { 1782 struct in6_ifaddr *ia; 1783 int s = pserialize_read_enter(); 1784 1785 ia = in6ifa_ifpforlinklocal(ifp, ignoreflags); 1786 if (ia != NULL) 1787 ia6_acquire(ia, psref); 1788 pserialize_read_exit(s); 1789 1790 return ia; 1791 } 1792 1793 /* 1794 * find the internet address corresponding to a given address. 1795 * ifaddr is returned referenced. 1796 */ 1797 struct in6_ifaddr * 1798 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid) 1799 { 1800 struct in6_ifaddr *ia; 1801 int s; 1802 1803 s = pserialize_read_enter(); 1804 IN6_ADDRLIST_READER_FOREACH(ia) { 1805 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1806 if (zoneid != 0 && 1807 zoneid != ia->ia_addr.sin6_scope_id) 1808 continue; 1809 ifaref(&ia->ia_ifa); 1810 break; 1811 } 1812 } 1813 pserialize_read_exit(s); 1814 1815 return ia; 1816 } 1817 1818 /* 1819 * find the internet address corresponding to a given interface and address. 1820 */ 1821 struct in6_ifaddr * 1822 in6ifa_ifpwithaddr(const struct ifnet *ifp, const struct in6_addr *addr) 1823 { 1824 struct ifaddr *best_ifa = NULL, *ifa; 1825 1826 IFADDR_READER_FOREACH(ifa, ifp) { 1827 if (ifa->ifa_addr->sa_family != AF_INET6) 1828 continue; 1829 if (!IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1830 continue; 1831 best_ifa = bestifa(best_ifa, ifa); 1832 } 1833 1834 return (struct in6_ifaddr *)best_ifa; 1835 } 1836 1837 struct in6_ifaddr * 1838 in6ifa_ifpwithaddr_psref(const struct ifnet *ifp, const struct in6_addr *addr, 1839 struct psref *psref) 1840 { 1841 struct in6_ifaddr *ia; 1842 int s = pserialize_read_enter(); 1843 1844 ia = in6ifa_ifpwithaddr(ifp, addr); 1845 if (ia != NULL) 1846 ia6_acquire(ia, psref); 1847 pserialize_read_exit(s); 1848 1849 return ia; 1850 } 1851 1852 static struct in6_ifaddr * 1853 bestia(struct in6_ifaddr *best_ia, struct in6_ifaddr *ia) 1854 { 1855 if (best_ia == NULL || 1856 best_ia->ia_ifa.ifa_preference < ia->ia_ifa.ifa_preference) 1857 return ia; 1858 return best_ia; 1859 } 1860 1861 /* 1862 * Convert IP6 address to printable (loggable) representation. 1863 */ 1864 char * 1865 ip6_sprintf(const struct in6_addr *addr) 1866 { 1867 static int ip6round = 0; 1868 static char ip6buf[8][INET6_ADDRSTRLEN]; 1869 char *cp = ip6buf[ip6round++ & 7]; 1870 1871 in6_print(cp, INET6_ADDRSTRLEN, addr); 1872 return cp; 1873 } 1874 1875 /* 1876 * Determine if an address is on a local network. 1877 */ 1878 int 1879 in6_localaddr(const struct in6_addr *in6) 1880 { 1881 struct in6_ifaddr *ia; 1882 int s; 1883 1884 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1885 return 1; 1886 1887 s = pserialize_read_enter(); 1888 IN6_ADDRLIST_READER_FOREACH(ia) { 1889 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1890 &ia->ia_prefixmask.sin6_addr)) { 1891 pserialize_read_exit(s); 1892 return 1; 1893 } 1894 } 1895 pserialize_read_exit(s); 1896 1897 return 0; 1898 } 1899 1900 int 1901 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1902 { 1903 struct in6_ifaddr *ia; 1904 int s; 1905 1906 s = pserialize_read_enter(); 1907 IN6_ADDRLIST_READER_FOREACH(ia) { 1908 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1909 &sa6->sin6_addr) && 1910 #ifdef SCOPEDROUTING 1911 ia->ia_addr.sin6_scope_id == sa6->sin6_scope_id && 1912 #endif 1913 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) { 1914 pserialize_read_exit(s); 1915 return 1; /* true */ 1916 } 1917 1918 /* XXX: do we still have to go thru the rest of the list? */ 1919 } 1920 pserialize_read_exit(s); 1921 1922 return 0; /* false */ 1923 } 1924 1925 /* 1926 * return length of part which dst and src are equal 1927 * hard coding... 1928 */ 1929 int 1930 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1931 { 1932 int match = 0; 1933 u_char *s = (u_char *)src, *d = (u_char *)dst; 1934 u_char *lim = s + 16, r; 1935 1936 while (s < lim) 1937 if ((r = (*d++ ^ *s++)) != 0) { 1938 while (r < 128) { 1939 match++; 1940 r <<= 1; 1941 } 1942 break; 1943 } else 1944 match += NBBY; 1945 return match; 1946 } 1947 1948 /* XXX: to be scope conscious */ 1949 int 1950 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1951 { 1952 int bytelen, bitlen; 1953 1954 /* sanity check */ 1955 if (len < 0 || len > 128) { 1956 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1957 len); 1958 return 0; 1959 } 1960 1961 bytelen = len / NBBY; 1962 bitlen = len % NBBY; 1963 1964 if (memcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1965 return 0; 1966 if (bitlen != 0 && 1967 p1->s6_addr[bytelen] >> (NBBY - bitlen) != 1968 p2->s6_addr[bytelen] >> (NBBY - bitlen)) 1969 return 0; 1970 1971 return 1; 1972 } 1973 1974 void 1975 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1976 { 1977 static const u_char maskarray[NBBY] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1978 int bytelen, bitlen, i; 1979 1980 /* sanity check */ 1981 if (len < 0 || len > 128) { 1982 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1983 len); 1984 return; 1985 } 1986 1987 memset(maskp, 0, sizeof(*maskp)); 1988 bytelen = len / NBBY; 1989 bitlen = len % NBBY; 1990 for (i = 0; i < bytelen; i++) 1991 maskp->s6_addr[i] = 0xff; 1992 if (bitlen) 1993 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1994 } 1995 1996 /* 1997 * return the best address out of the same scope. if no address was 1998 * found, return the first valid address from designated IF. 1999 */ 2000 struct in6_ifaddr * 2001 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2002 { 2003 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2004 struct ifaddr *ifa; 2005 struct in6_ifaddr *best_ia = NULL, *ia; 2006 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2007 2008 dep[0] = dep[1] = NULL; 2009 2010 /* 2011 * We first look for addresses in the same scope. 2012 * If there is one, return it. 2013 * If two or more, return one which matches the dst longest. 2014 * If none, return one of global addresses assigned other ifs. 2015 */ 2016 IFADDR_READER_FOREACH(ifa, ifp) { 2017 if (ifa->ifa_addr->sa_family != AF_INET6) 2018 continue; 2019 ia = (struct in6_ifaddr *)ifa; 2020 if (ia->ia6_flags & IN6_IFF_ANYCAST) 2021 continue; /* XXX: is there any case to allow anycast? */ 2022 if (ia->ia6_flags & IN6_IFF_NOTREADY) 2023 continue; /* don't use this interface */ 2024 if (ia->ia6_flags & IN6_IFF_DETACHED) 2025 continue; 2026 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2027 if (ip6_use_deprecated) 2028 dep[0] = ia; 2029 continue; 2030 } 2031 2032 if (dst_scope != in6_addrscope(IFA_IN6(ifa))) 2033 continue; 2034 /* 2035 * call in6_matchlen() as few as possible 2036 */ 2037 if (best_ia == NULL) { 2038 best_ia = ia; 2039 continue; 2040 } 2041 if (blen == -1) 2042 blen = in6_matchlen(&best_ia->ia_addr.sin6_addr, dst); 2043 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2044 if (tlen > blen) { 2045 blen = tlen; 2046 best_ia = ia; 2047 } else if (tlen == blen) 2048 best_ia = bestia(best_ia, ia); 2049 } 2050 if (best_ia != NULL) 2051 return best_ia; 2052 2053 IFADDR_READER_FOREACH(ifa, ifp) { 2054 if (ifa->ifa_addr->sa_family != AF_INET6) 2055 continue; 2056 ia = (struct in6_ifaddr *)ifa; 2057 if (ia->ia6_flags & IN6_IFF_ANYCAST) 2058 continue; /* XXX: is there any case to allow anycast? */ 2059 if (ia->ia6_flags & IN6_IFF_NOTREADY) 2060 continue; /* don't use this interface */ 2061 if (ia->ia6_flags & IN6_IFF_DETACHED) 2062 continue; 2063 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2064 if (ip6_use_deprecated) 2065 dep[1] = (struct in6_ifaddr *)ifa; 2066 continue; 2067 } 2068 2069 best_ia = bestia(best_ia, ia); 2070 } 2071 if (best_ia != NULL) 2072 return best_ia; 2073 2074 /* use the last-resort values, that are, deprecated addresses */ 2075 if (dep[0]) 2076 return dep[0]; 2077 if (dep[1]) 2078 return dep[1]; 2079 2080 return NULL; 2081 } 2082 2083 /* 2084 * perform DAD when interface becomes IFF_UP. 2085 */ 2086 void 2087 in6_if_link_up(struct ifnet *ifp) 2088 { 2089 struct ifaddr *ifa; 2090 struct in6_ifaddr *ia; 2091 int s, bound; 2092 2093 /* Ensure it's sane to run DAD */ 2094 if (ifp->if_link_state == LINK_STATE_DOWN) 2095 return; 2096 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 2097 return; 2098 2099 bound = curlwp_bind(); 2100 s = pserialize_read_enter(); 2101 IFADDR_READER_FOREACH(ifa, ifp) { 2102 struct psref psref; 2103 2104 if (ifa->ifa_addr->sa_family != AF_INET6) 2105 continue; 2106 2107 ifa_acquire(ifa, &psref); 2108 pserialize_read_exit(s); 2109 ia = (struct in6_ifaddr *)ifa; 2110 2111 /* If detached then mark as tentative */ 2112 if (ia->ia6_flags & IN6_IFF_DETACHED) { 2113 ia->ia6_flags &= ~IN6_IFF_DETACHED; 2114 if (if_do_dad(ifp)) { 2115 ia->ia6_flags |= IN6_IFF_TENTATIVE; 2116 nd6log(LOG_ERR, "%s marked tentative\n", 2117 ip6_sprintf(&ia->ia_addr.sin6_addr)); 2118 } else if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) 2119 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 2120 } 2121 2122 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2123 int rand_delay; 2124 2125 /* Clear the duplicated flag as we're starting DAD. */ 2126 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; 2127 2128 /* 2129 * The TENTATIVE flag was likely set by hand 2130 * beforehand, implicitly indicating the need for DAD. 2131 * We may be able to skip the random delay in this 2132 * case, but we impose delays just in case. 2133 */ 2134 rand_delay = cprng_fast32() % 2135 (MAX_RTR_SOLICITATION_DELAY * hz); 2136 /* +1 ensures callout is always used */ 2137 nd6_dad_start(ifa, rand_delay + 1); 2138 } 2139 2140 s = pserialize_read_enter(); 2141 ifa_release(ifa, &psref); 2142 } 2143 pserialize_read_exit(s); 2144 curlwp_bindx(bound); 2145 2146 /* Restore any detached prefixes */ 2147 pfxlist_onlink_check(); 2148 } 2149 2150 void 2151 in6_if_up(struct ifnet *ifp) 2152 { 2153 2154 /* 2155 * special cases, like 6to4, are handled in in6_ifattach 2156 */ 2157 in6_ifattach(ifp, NULL); 2158 2159 /* interface may not support link state, so bring it up also */ 2160 in6_if_link_up(ifp); 2161 } 2162 2163 /* 2164 * Mark all addresses as detached. 2165 */ 2166 void 2167 in6_if_link_down(struct ifnet *ifp) 2168 { 2169 struct ifaddr *ifa; 2170 struct in6_ifaddr *ia; 2171 int s, bound; 2172 2173 /* Any prefixes on this interface should be detached as well */ 2174 pfxlist_onlink_check(); 2175 2176 bound = curlwp_bind(); 2177 s = pserialize_read_enter(); 2178 IFADDR_READER_FOREACH(ifa, ifp) { 2179 struct psref psref; 2180 2181 if (ifa->ifa_addr->sa_family != AF_INET6) 2182 continue; 2183 2184 ifa_acquire(ifa, &psref); 2185 pserialize_read_exit(s); 2186 ia = (struct in6_ifaddr *)ifa; 2187 2188 /* Stop DAD processing */ 2189 nd6_dad_stop(ifa); 2190 2191 /* 2192 * Mark the address as detached. 2193 * This satisfies RFC4862 Section 5.3, but we should apply 2194 * this logic to all addresses to be a good citizen and 2195 * avoid potential duplicated addresses. 2196 * When the interface comes up again, detached addresses 2197 * are marked tentative and DAD commences. 2198 */ 2199 if (!(ia->ia6_flags & IN6_IFF_DETACHED)) { 2200 nd6log(LOG_DEBUG, "%s marked detached\n", 2201 ip6_sprintf(&ia->ia_addr.sin6_addr)); 2202 ia->ia6_flags |= IN6_IFF_DETACHED; 2203 ia->ia6_flags &= 2204 ~(IN6_IFF_TENTATIVE | IN6_IFF_DUPLICATED); 2205 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 2206 } 2207 2208 s = pserialize_read_enter(); 2209 ifa_release(ifa, &psref); 2210 } 2211 pserialize_read_exit(s); 2212 curlwp_bindx(bound); 2213 } 2214 2215 void 2216 in6_if_down(struct ifnet *ifp) 2217 { 2218 2219 in6_if_link_down(ifp); 2220 } 2221 2222 void 2223 in6_if_link_state_change(struct ifnet *ifp, int link_state) 2224 { 2225 2226 switch (link_state) { 2227 case LINK_STATE_DOWN: 2228 in6_if_link_down(ifp); 2229 break; 2230 case LINK_STATE_UP: 2231 in6_if_link_up(ifp); 2232 break; 2233 } 2234 } 2235 2236 /* 2237 * Calculate max IPv6 MTU through all the interfaces and store it 2238 * to in6_maxmtu. 2239 */ 2240 void 2241 in6_setmaxmtu(void) 2242 { 2243 unsigned long maxmtu = 0; 2244 struct ifnet *ifp; 2245 int s; 2246 2247 s = pserialize_read_enter(); 2248 IFNET_READER_FOREACH(ifp) { 2249 /* this function can be called during ifnet initialization */ 2250 if (!ifp->if_afdata[AF_INET6]) 2251 continue; 2252 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2253 IN6_LINKMTU(ifp) > maxmtu) 2254 maxmtu = IN6_LINKMTU(ifp); 2255 } 2256 pserialize_read_exit(s); 2257 if (maxmtu) /* update only when maxmtu is positive */ 2258 in6_maxmtu = maxmtu; 2259 } 2260 2261 /* 2262 * Provide the length of interface identifiers to be used for the link attached 2263 * to the given interface. The length should be defined in "IPv6 over 2264 * xxx-link" document. Note that address architecture might also define 2265 * the length for a particular set of address prefixes, regardless of the 2266 * link type. As clarified in rfc2462bis, those two definitions should be 2267 * consistent, and those really are as of August 2004. 2268 */ 2269 int 2270 in6_if2idlen(struct ifnet *ifp) 2271 { 2272 switch (ifp->if_type) { 2273 case IFT_ETHER: /* RFC2464 */ 2274 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2275 case IFT_L2VLAN: /* ditto */ 2276 case IFT_IEEE80211: /* ditto */ 2277 case IFT_FDDI: /* RFC2467 */ 2278 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 2279 case IFT_PPP: /* RFC2472 */ 2280 case IFT_ARCNET: /* RFC2497 */ 2281 case IFT_FRELAY: /* RFC2590 */ 2282 case IFT_IEEE1394: /* RFC3146 */ 2283 case IFT_GIF: /* draft-ietf-v6ops-mech-v2-07 */ 2284 case IFT_LOOP: /* XXX: is this really correct? */ 2285 return 64; 2286 default: 2287 /* 2288 * Unknown link type: 2289 * It might be controversial to use the today's common constant 2290 * of 64 for these cases unconditionally. For full compliance, 2291 * we should return an error in this case. On the other hand, 2292 * if we simply miss the standard for the link type or a new 2293 * standard is defined for a new link type, the IFID length 2294 * is very likely to be the common constant. As a compromise, 2295 * we always use the constant, but make an explicit notice 2296 * indicating the "unknown" case. 2297 */ 2298 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2299 return 64; 2300 } 2301 } 2302 2303 struct in6_llentry { 2304 struct llentry base; 2305 }; 2306 2307 #define IN6_LLTBL_DEFAULT_HSIZE 32 2308 #define IN6_LLTBL_HASH(k, h) \ 2309 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 2310 2311 /* 2312 * Do actual deallocation of @lle. 2313 * Called by LLE_FREE_LOCKED when number of references 2314 * drops to zero. 2315 */ 2316 static void 2317 in6_lltable_destroy_lle(struct llentry *lle) 2318 { 2319 2320 LLE_WUNLOCK(lle); 2321 LLE_LOCK_DESTROY(lle); 2322 kmem_intr_free(lle, sizeof(struct in6_llentry)); 2323 } 2324 2325 static struct llentry * 2326 in6_lltable_new(const struct in6_addr *addr6, u_int flags) 2327 { 2328 struct in6_llentry *lle; 2329 2330 lle = kmem_intr_zalloc(sizeof(struct in6_llentry), KM_NOSLEEP); 2331 if (lle == NULL) /* NB: caller generates msg */ 2332 return NULL; 2333 2334 lle->base.r_l3addr.addr6 = *addr6; 2335 lle->base.lle_refcnt = 1; 2336 lle->base.lle_free = in6_lltable_destroy_lle; 2337 LLE_LOCK_INIT(&lle->base); 2338 callout_init(&lle->base.lle_timer, CALLOUT_MPSAFE); 2339 2340 return &lle->base; 2341 } 2342 2343 static int 2344 in6_lltable_match_prefix(const struct sockaddr *prefix, 2345 const struct sockaddr *mask, u_int flags, struct llentry *lle) 2346 { 2347 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix; 2348 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask; 2349 2350 if (IN6_ARE_MASKED_ADDR_EQUAL(&lle->r_l3addr.addr6, 2351 &pfx->sin6_addr, &msk->sin6_addr) && 2352 ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) 2353 return 1; 2354 2355 return 0; 2356 } 2357 2358 static void 2359 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle) 2360 { 2361 struct ifnet *ifp __diagused; 2362 2363 LLE_WLOCK_ASSERT(lle); 2364 KASSERT(llt != NULL); 2365 2366 /* Unlink entry from table */ 2367 if ((lle->la_flags & LLE_LINKED) != 0) { 2368 2369 ifp = llt->llt_ifp; 2370 IF_AFDATA_WLOCK_ASSERT(ifp); 2371 lltable_unlink_entry(llt, lle); 2372 } 2373 2374 KASSERT(mutex_owned(softnet_lock)); 2375 callout_halt(&lle->lle_timer, softnet_lock); 2376 LLE_REMREF(lle); 2377 2378 llentry_free(lle); 2379 } 2380 2381 static int 2382 in6_lltable_rtcheck(struct ifnet *ifp, 2383 u_int flags, 2384 const struct sockaddr *l3addr) 2385 { 2386 struct rtentry *rt; 2387 2388 KASSERTMSG(l3addr->sa_family == AF_INET6, 2389 "sin_family %d", l3addr->sa_family); 2390 2391 rt = rtalloc1(l3addr, 0); 2392 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 2393 int s; 2394 struct ifaddr *ifa; 2395 /* 2396 * Create an ND6 cache for an IPv6 neighbor 2397 * that is not covered by our own prefix. 2398 */ 2399 /* XXX ifaof_ifpforaddr should take a const param */ 2400 s = pserialize_read_enter(); 2401 ifa = ifaof_ifpforaddr(l3addr, ifp); 2402 if (ifa != NULL) { 2403 pserialize_read_exit(s); 2404 if (rt != NULL) 2405 rtfree(rt); 2406 return 0; 2407 } 2408 pserialize_read_exit(s); 2409 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2410 ip6_sprintf(&((const struct sockaddr_in6 *)l3addr)->sin6_addr)); 2411 if (rt != NULL) 2412 rtfree(rt); 2413 return EINVAL; 2414 } 2415 rtfree(rt); 2416 return 0; 2417 } 2418 2419 static inline uint32_t 2420 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize) 2421 { 2422 2423 return IN6_LLTBL_HASH(dst->s6_addr32[3], hsize); 2424 } 2425 2426 static uint32_t 2427 in6_lltable_hash(const struct llentry *lle, uint32_t hsize) 2428 { 2429 2430 return in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize); 2431 } 2432 2433 static void 2434 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 2435 { 2436 struct sockaddr_in6 *sin6; 2437 2438 sin6 = (struct sockaddr_in6 *)sa; 2439 bzero(sin6, sizeof(*sin6)); 2440 sin6->sin6_family = AF_INET6; 2441 sin6->sin6_len = sizeof(*sin6); 2442 sin6->sin6_addr = lle->r_l3addr.addr6; 2443 } 2444 2445 static inline struct llentry * 2446 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst) 2447 { 2448 struct llentry *lle; 2449 struct llentries *lleh; 2450 u_int hashidx; 2451 2452 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize); 2453 lleh = &llt->lle_head[hashidx]; 2454 LIST_FOREACH(lle, lleh, lle_next) { 2455 if (lle->la_flags & LLE_DELETED) 2456 continue; 2457 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst)) 2458 break; 2459 } 2460 2461 return lle; 2462 } 2463 2464 static int 2465 in6_lltable_delete(struct lltable *llt, u_int flags, 2466 const struct sockaddr *l3addr) 2467 { 2468 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2469 struct llentry *lle; 2470 2471 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp); 2472 KASSERTMSG(l3addr->sa_family == AF_INET6, 2473 "sin_family %d", l3addr->sa_family); 2474 2475 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2476 2477 if (lle == NULL) 2478 return ENOENT; 2479 2480 LLE_WLOCK(lle); 2481 lle->la_flags |= LLE_DELETED; 2482 #ifdef DIAGNOSTIC 2483 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2484 #endif 2485 if ((lle->la_flags & (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC) 2486 llentry_free(lle); 2487 else 2488 LLE_WUNLOCK(lle); 2489 2490 return 0; 2491 } 2492 2493 static struct llentry * 2494 in6_lltable_create(struct lltable *llt, u_int flags, 2495 const struct sockaddr *l3addr) 2496 { 2497 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2498 struct ifnet *ifp = llt->llt_ifp; 2499 struct llentry *lle; 2500 2501 IF_AFDATA_WLOCK_ASSERT(ifp); 2502 KASSERTMSG(l3addr->sa_family == AF_INET6, 2503 "sin_family %d", l3addr->sa_family); 2504 2505 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2506 2507 if (lle != NULL) { 2508 LLE_WLOCK(lle); 2509 return lle; 2510 } 2511 2512 /* 2513 * A route that covers the given address must have 2514 * been installed 1st because we are doing a resolution, 2515 * verify this. 2516 */ 2517 if (!(flags & LLE_IFADDR) && 2518 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2519 return NULL; 2520 2521 lle = in6_lltable_new(&sin6->sin6_addr, flags); 2522 if (lle == NULL) { 2523 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2524 return NULL; 2525 } 2526 lle->la_flags = flags; 2527 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 2528 memcpy(&lle->ll_addr, CLLADDR(ifp->if_sadl), ifp->if_addrlen); 2529 lle->la_flags |= LLE_VALID; 2530 } 2531 2532 lltable_link_entry(llt, lle); 2533 LLE_WLOCK(lle); 2534 2535 return lle; 2536 } 2537 2538 static struct llentry * 2539 in6_lltable_lookup(struct lltable *llt, u_int flags, 2540 const struct sockaddr *l3addr) 2541 { 2542 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2543 struct llentry *lle; 2544 2545 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 2546 KASSERTMSG(l3addr->sa_family == AF_INET6, 2547 "sin_family %d", l3addr->sa_family); 2548 2549 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2550 2551 if (lle == NULL) 2552 return NULL; 2553 2554 if (flags & LLE_EXCLUSIVE) 2555 LLE_WLOCK(lle); 2556 else 2557 LLE_RLOCK(lle); 2558 return lle; 2559 } 2560 2561 static int 2562 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 2563 struct rt_walkarg *w) 2564 { 2565 struct sockaddr_in6 sin6; 2566 2567 LLTABLE_LOCK_ASSERT(); 2568 2569 /* skip deleted entries */ 2570 if (lle->la_flags & LLE_DELETED) 2571 return 0; 2572 2573 sockaddr_in6_init(&sin6, &lle->r_l3addr.addr6, 0, 0, 0); 2574 2575 return lltable_dump_entry(llt, lle, w, sin6tosa(&sin6)); 2576 } 2577 2578 static struct lltable * 2579 in6_lltattach(struct ifnet *ifp) 2580 { 2581 struct lltable *llt; 2582 2583 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE); 2584 llt->llt_af = AF_INET6; 2585 llt->llt_ifp = ifp; 2586 2587 llt->llt_lookup = in6_lltable_lookup; 2588 llt->llt_create = in6_lltable_create; 2589 llt->llt_delete = in6_lltable_delete; 2590 llt->llt_dump_entry = in6_lltable_dump_entry; 2591 llt->llt_hash = in6_lltable_hash; 2592 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry; 2593 llt->llt_free_entry = in6_lltable_free_entry; 2594 llt->llt_match_prefix = in6_lltable_match_prefix; 2595 lltable_link(llt); 2596 2597 return llt; 2598 } 2599 2600 void * 2601 in6_domifattach(struct ifnet *ifp) 2602 { 2603 struct in6_ifextra *ext; 2604 2605 ext = malloc(sizeof(*ext), M_IFADDR, M_WAITOK|M_ZERO); 2606 2607 ext->in6_ifstat = malloc(sizeof(struct in6_ifstat), 2608 M_IFADDR, M_WAITOK|M_ZERO); 2609 2610 ext->icmp6_ifstat = malloc(sizeof(struct icmp6_ifstat), 2611 M_IFADDR, M_WAITOK|M_ZERO); 2612 2613 ext->nd_ifinfo = nd6_ifattach(ifp); 2614 ext->scope6_id = scope6_ifattach(ifp); 2615 ext->nprefixes = 0; 2616 ext->ndefrouters = 0; 2617 2618 ext->lltable = in6_lltattach(ifp); 2619 2620 return ext; 2621 } 2622 2623 void 2624 in6_domifdetach(struct ifnet *ifp, void *aux) 2625 { 2626 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2627 2628 lltable_free(ext->lltable); 2629 ext->lltable = NULL; 2630 nd6_ifdetach(ifp, ext); 2631 free(ext->in6_ifstat, M_IFADDR); 2632 free(ext->icmp6_ifstat, M_IFADDR); 2633 scope6_ifdetach(ext->scope6_id); 2634 free(ext, M_IFADDR); 2635 } 2636 2637 /* 2638 * Convert IPv4 address stored in struct in_addr to IPv4-Mapped IPv6 address 2639 * stored in struct in6_addr as defined in RFC 4921 section 2.5.5.2. 2640 */ 2641 void 2642 in6_in_2_v4mapin6(const struct in_addr *in, struct in6_addr *in6) 2643 { 2644 in6->s6_addr32[0] = 0; 2645 in6->s6_addr32[1] = 0; 2646 in6->s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2647 in6->s6_addr32[3] = in->s_addr; 2648 } 2649 2650 /* 2651 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2652 * v4 mapped addr or v4 compat addr 2653 */ 2654 void 2655 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2656 { 2657 memset(sin, 0, sizeof(*sin)); 2658 sin->sin_len = sizeof(struct sockaddr_in); 2659 sin->sin_family = AF_INET; 2660 sin->sin_port = sin6->sin6_port; 2661 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2662 } 2663 2664 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2665 void 2666 in6_sin_2_v4mapsin6(const struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2667 { 2668 memset(sin6, 0, sizeof(*sin6)); 2669 sin6->sin6_len = sizeof(struct sockaddr_in6); 2670 sin6->sin6_family = AF_INET6; 2671 sin6->sin6_port = sin->sin_port; 2672 in6_in_2_v4mapin6(&sin->sin_addr, &sin6->sin6_addr); 2673 } 2674 2675 /* Convert sockaddr_in6 into sockaddr_in. */ 2676 void 2677 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2678 { 2679 struct sockaddr_in *sin_p; 2680 struct sockaddr_in6 sin6; 2681 2682 /* 2683 * Save original sockaddr_in6 addr and convert it 2684 * to sockaddr_in. 2685 */ 2686 sin6 = *(struct sockaddr_in6 *)nam; 2687 sin_p = (struct sockaddr_in *)nam; 2688 in6_sin6_2_sin(sin_p, &sin6); 2689 } 2690 2691 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2692 void 2693 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2694 { 2695 struct sockaddr_in *sin_p; 2696 struct sockaddr_in6 *sin6_p; 2697 2698 sin6_p = malloc(sizeof(*sin6_p), M_SONAME, M_WAITOK); 2699 sin_p = (struct sockaddr_in *)*nam; 2700 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2701 free(*nam, M_SONAME); 2702 *nam = sin6tosa(sin6_p); 2703 } 2704