1 /* $NetBSD: in6.c,v 1.217 2016/08/18 09:34:43 roy 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 1.217 2016/08/18 09:34:43 roy 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 base prefix. There should be a 1380 * positive reference. 1381 */ 1382 if (ia->ia6_ndpr == NULL) { 1383 nd6log(LOG_NOTICE, "autoconf'ed address %p has no prefix\n", 1384 ia); 1385 } else { 1386 ia->ia6_ndpr->ndpr_refcnt--; 1387 ia->ia6_ndpr = NULL; 1388 } 1389 1390 /* 1391 * Also, if the address being removed is autoconf'ed, call 1392 * pfxlist_onlink_check() since the release might affect the status of 1393 * other (detached) addresses. 1394 */ 1395 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) != 0) 1396 pfxlist_onlink_check(); 1397 1398 IN6_ADDRLIST_ENTRY_DESTROY(ia); 1399 1400 /* 1401 * release another refcnt for the link from in6_ifaddr. 1402 * Note that we should decrement the refcnt at least once for all *BSD. 1403 */ 1404 ifafree(&ia->ia_ifa); 1405 1406 splx(s); 1407 } 1408 1409 void 1410 in6_purgeif(struct ifnet *ifp) 1411 { 1412 1413 in6_ifdetach(ifp); 1414 } 1415 1416 /* 1417 * SIOC[GAD]LIFADDR. 1418 * SIOCGLIFADDR: get first address. (?) 1419 * SIOCGLIFADDR with IFLR_PREFIX: 1420 * get first address that matches the specified prefix. 1421 * SIOCALIFADDR: add the specified address. 1422 * SIOCALIFADDR with IFLR_PREFIX: 1423 * add the specified prefix, filling hostid part from 1424 * the first link-local address. prefixlen must be <= 64. 1425 * SIOCDLIFADDR: delete the specified address. 1426 * SIOCDLIFADDR with IFLR_PREFIX: 1427 * delete the first address that matches the specified prefix. 1428 * return values: 1429 * EINVAL on invalid parameters 1430 * EADDRNOTAVAIL on prefix match failed/specified address not found 1431 * other values may be returned from in6_ioctl() 1432 * 1433 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1434 * this is to accommodate address naming scheme other than RFC2374, 1435 * in the future. 1436 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1437 * address encoding scheme. (see figure on page 8) 1438 */ 1439 static int 1440 in6_lifaddr_ioctl(struct socket *so, u_long cmd, void *data, 1441 struct ifnet *ifp) 1442 { 1443 struct in6_ifaddr *ia = NULL; /* XXX gcc 4.8 maybe-uninitialized */ 1444 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1445 struct ifaddr *ifa; 1446 struct sockaddr *sa; 1447 1448 /* sanity checks */ 1449 if (!data || !ifp) { 1450 panic("invalid argument to in6_lifaddr_ioctl"); 1451 /* NOTREACHED */ 1452 } 1453 1454 switch (cmd) { 1455 case SIOCGLIFADDR: 1456 /* address must be specified on GET with IFLR_PREFIX */ 1457 if ((iflr->flags & IFLR_PREFIX) == 0) 1458 break; 1459 /* FALLTHROUGH */ 1460 case SIOCALIFADDR: 1461 case SIOCDLIFADDR: 1462 /* address must be specified on ADD and DELETE */ 1463 sa = (struct sockaddr *)&iflr->addr; 1464 if (sa->sa_family != AF_INET6) 1465 return EINVAL; 1466 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1467 return EINVAL; 1468 /* XXX need improvement */ 1469 sa = (struct sockaddr *)&iflr->dstaddr; 1470 if (sa->sa_family && sa->sa_family != AF_INET6) 1471 return EINVAL; 1472 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1473 return EINVAL; 1474 break; 1475 default: /* shouldn't happen */ 1476 #if 0 1477 panic("invalid cmd to in6_lifaddr_ioctl"); 1478 /* NOTREACHED */ 1479 #else 1480 return EOPNOTSUPP; 1481 #endif 1482 } 1483 if (sizeof(struct in6_addr) * NBBY < iflr->prefixlen) 1484 return EINVAL; 1485 1486 switch (cmd) { 1487 case SIOCALIFADDR: 1488 { 1489 struct in6_aliasreq ifra; 1490 struct in6_addr *xhostid = NULL; 1491 int prefixlen; 1492 int bound = curlwp_bind(); 1493 struct psref psref; 1494 1495 if ((iflr->flags & IFLR_PREFIX) != 0) { 1496 struct sockaddr_in6 *sin6; 1497 1498 /* 1499 * xhostid is to fill in the hostid part of the 1500 * address. xhostid points to the first link-local 1501 * address attached to the interface. 1502 */ 1503 ia = in6ifa_ifpforlinklocal_psref(ifp, 0, &psref); 1504 if (ia == NULL) { 1505 curlwp_bindx(bound); 1506 return EADDRNOTAVAIL; 1507 } 1508 xhostid = IFA_IN6(&ia->ia_ifa); 1509 1510 /* prefixlen must be <= 64. */ 1511 if (64 < iflr->prefixlen) { 1512 ia6_release(ia, &psref); 1513 curlwp_bindx(bound); 1514 return EINVAL; 1515 } 1516 prefixlen = iflr->prefixlen; 1517 1518 /* hostid part must be zero. */ 1519 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1520 if (sin6->sin6_addr.s6_addr32[2] != 0 1521 || sin6->sin6_addr.s6_addr32[3] != 0) { 1522 ia6_release(ia, &psref); 1523 curlwp_bindx(bound); 1524 return EINVAL; 1525 } 1526 } else 1527 prefixlen = iflr->prefixlen; 1528 1529 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1530 memset(&ifra, 0, sizeof(ifra)); 1531 memcpy(ifra.ifra_name, iflr->iflr_name, sizeof(ifra.ifra_name)); 1532 1533 memcpy(&ifra.ifra_addr, &iflr->addr, 1534 ((struct sockaddr *)&iflr->addr)->sa_len); 1535 if (xhostid) { 1536 /* fill in hostid part */ 1537 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1538 xhostid->s6_addr32[2]; 1539 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1540 xhostid->s6_addr32[3]; 1541 } 1542 1543 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1544 memcpy(&ifra.ifra_dstaddr, &iflr->dstaddr, 1545 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1546 if (xhostid) { 1547 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1548 xhostid->s6_addr32[2]; 1549 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1550 xhostid->s6_addr32[3]; 1551 } 1552 } 1553 if (xhostid) { 1554 ia6_release(ia, &psref); 1555 ia = NULL; 1556 } 1557 curlwp_bindx(bound); 1558 1559 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1560 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1561 1562 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 1563 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 1564 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1565 return in6_control(so, SIOCAIFADDR_IN6, &ifra, ifp); 1566 } 1567 case SIOCGLIFADDR: 1568 case SIOCDLIFADDR: 1569 { 1570 struct in6_addr mask, candidate, match; 1571 struct sockaddr_in6 *sin6; 1572 int cmp; 1573 int error, s; 1574 1575 memset(&mask, 0, sizeof(mask)); 1576 if (iflr->flags & IFLR_PREFIX) { 1577 /* lookup a prefix rather than address. */ 1578 in6_prefixlen2mask(&mask, iflr->prefixlen); 1579 1580 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1581 memcpy(&match, &sin6->sin6_addr, sizeof(match)); 1582 match.s6_addr32[0] &= mask.s6_addr32[0]; 1583 match.s6_addr32[1] &= mask.s6_addr32[1]; 1584 match.s6_addr32[2] &= mask.s6_addr32[2]; 1585 match.s6_addr32[3] &= mask.s6_addr32[3]; 1586 1587 /* if you set extra bits, that's wrong */ 1588 if (memcmp(&match, &sin6->sin6_addr, sizeof(match))) 1589 return EINVAL; 1590 1591 cmp = 1; 1592 } else { 1593 if (cmd == SIOCGLIFADDR) { 1594 /* on getting an address, take the 1st match */ 1595 cmp = 0; /* XXX */ 1596 } else { 1597 /* on deleting an address, do exact match */ 1598 in6_prefixlen2mask(&mask, 128); 1599 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1600 memcpy(&match, &sin6->sin6_addr, sizeof(match)); 1601 1602 cmp = 1; 1603 } 1604 } 1605 1606 s = pserialize_read_enter(); 1607 IFADDR_READER_FOREACH(ifa, ifp) { 1608 if (ifa->ifa_addr->sa_family != AF_INET6) 1609 continue; 1610 if (!cmp) 1611 break; 1612 1613 /* 1614 * XXX: this is adhoc, but is necessary to allow 1615 * a user to specify fe80::/64 (not /10) for a 1616 * link-local address. 1617 */ 1618 memcpy(&candidate, IFA_IN6(ifa), sizeof(candidate)); 1619 in6_clearscope(&candidate); 1620 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1621 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1622 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1623 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1624 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1625 break; 1626 } 1627 if (!ifa) { 1628 error = EADDRNOTAVAIL; 1629 goto error; 1630 } 1631 ia = ifa2ia6(ifa); 1632 1633 if (cmd == SIOCGLIFADDR) { 1634 /* fill in the if_laddrreq structure */ 1635 memcpy(&iflr->addr, &ia->ia_addr, ia->ia_addr.sin6_len); 1636 error = sa6_recoverscope( 1637 (struct sockaddr_in6 *)&iflr->addr); 1638 if (error != 0) 1639 goto error; 1640 1641 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1642 memcpy(&iflr->dstaddr, &ia->ia_dstaddr, 1643 ia->ia_dstaddr.sin6_len); 1644 error = sa6_recoverscope( 1645 (struct sockaddr_in6 *)&iflr->dstaddr); 1646 if (error != 0) 1647 goto error; 1648 } else 1649 memset(&iflr->dstaddr, 0, sizeof(iflr->dstaddr)); 1650 1651 iflr->prefixlen = 1652 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1653 1654 iflr->flags = ia->ia6_flags; /* XXX */ 1655 1656 error = 0; 1657 } else { 1658 struct in6_aliasreq ifra; 1659 1660 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1661 memset(&ifra, 0, sizeof(ifra)); 1662 memcpy(ifra.ifra_name, iflr->iflr_name, 1663 sizeof(ifra.ifra_name)); 1664 1665 memcpy(&ifra.ifra_addr, &ia->ia_addr, 1666 ia->ia_addr.sin6_len); 1667 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1668 memcpy(&ifra.ifra_dstaddr, &ia->ia_dstaddr, 1669 ia->ia_dstaddr.sin6_len); 1670 } else { 1671 memset(&ifra.ifra_dstaddr, 0, 1672 sizeof(ifra.ifra_dstaddr)); 1673 } 1674 memcpy(&ifra.ifra_dstaddr, &ia->ia_prefixmask, 1675 ia->ia_prefixmask.sin6_len); 1676 1677 ifra.ifra_flags = ia->ia6_flags; 1678 pserialize_read_exit(s); 1679 1680 return in6_control(so, SIOCDIFADDR_IN6, &ifra, ifp); 1681 } 1682 error: 1683 pserialize_read_exit(s); 1684 return error; 1685 } 1686 } 1687 1688 return EOPNOTSUPP; /* just for safety */ 1689 } 1690 1691 /* 1692 * Initialize an interface's internet6 address 1693 * and routing table entry. 1694 */ 1695 static int 1696 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1697 const struct sockaddr_in6 *sin6, int newhost) 1698 { 1699 int error = 0, ifacount = 0; 1700 int s = splnet(); 1701 struct ifaddr *ifa; 1702 1703 /* 1704 * Give the interface a chance to initialize 1705 * if this is its first address, 1706 * and to validate the address if necessary. 1707 */ 1708 IFADDR_READER_FOREACH(ifa, ifp) { 1709 if (ifa->ifa_addr->sa_family != AF_INET6) 1710 continue; 1711 ifacount++; 1712 } 1713 1714 ia->ia_addr = *sin6; 1715 1716 if (ifacount <= 0 && 1717 (error = if_addr_init(ifp, &ia->ia_ifa, true)) != 0) { 1718 splx(s); 1719 return error; 1720 } 1721 splx(s); 1722 1723 ia->ia_ifa.ifa_metric = ifp->if_metric; 1724 1725 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1726 1727 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1728 if (newhost) { 1729 /* set the rtrequest function to create llinfo */ 1730 if (ifp->if_flags & IFF_POINTOPOINT) 1731 ia->ia_ifa.ifa_rtrequest = p2p_rtrequest; 1732 else if ((ifp->if_flags & IFF_LOOPBACK) == 0) 1733 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1734 in6_ifaddlocal(&ia->ia_ifa); 1735 } else { 1736 /* Inform the routing socket of new flags/timings */ 1737 rt_newaddrmsg(RTM_NEWADDR, &ia->ia_ifa, 0, NULL); 1738 } 1739 1740 /* Add the network prefix route. */ 1741 if ((error = in6_ifaddprefix(ia)) != 0) { 1742 if (newhost) 1743 in6_ifremlocal(&ia->ia_ifa); 1744 return error; 1745 } 1746 1747 if (ifp->if_flags & IFF_MULTICAST) 1748 in6_restoremkludge(ia, ifp); 1749 1750 return error; 1751 } 1752 1753 static struct ifaddr * 1754 bestifa(struct ifaddr *best_ifa, struct ifaddr *ifa) 1755 { 1756 if (best_ifa == NULL || best_ifa->ifa_preference < ifa->ifa_preference) 1757 return ifa; 1758 return best_ifa; 1759 } 1760 1761 /* 1762 * Find an IPv6 interface link-local address specific to an interface. 1763 */ 1764 struct in6_ifaddr * 1765 in6ifa_ifpforlinklocal(const struct ifnet *ifp, const int ignoreflags) 1766 { 1767 struct ifaddr *best_ifa = NULL, *ifa; 1768 1769 IFADDR_READER_FOREACH(ifa, ifp) { 1770 if (ifa->ifa_addr->sa_family != AF_INET6) 1771 continue; 1772 if (!IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) 1773 continue; 1774 if ((((struct in6_ifaddr *)ifa)->ia6_flags & ignoreflags) != 0) 1775 continue; 1776 best_ifa = bestifa(best_ifa, ifa); 1777 } 1778 1779 return (struct in6_ifaddr *)best_ifa; 1780 } 1781 1782 struct in6_ifaddr * 1783 in6ifa_ifpforlinklocal_psref(const struct ifnet *ifp, const int ignoreflags, 1784 struct psref *psref) 1785 { 1786 struct in6_ifaddr *ia; 1787 int s = pserialize_read_enter(); 1788 1789 ia = in6ifa_ifpforlinklocal(ifp, ignoreflags); 1790 if (ia != NULL) 1791 ia6_acquire(ia, psref); 1792 pserialize_read_exit(s); 1793 1794 return ia; 1795 } 1796 1797 /* 1798 * find the internet address corresponding to a given address. 1799 * ifaddr is returned referenced. 1800 */ 1801 struct in6_ifaddr * 1802 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid) 1803 { 1804 struct in6_ifaddr *ia; 1805 int s; 1806 1807 s = pserialize_read_enter(); 1808 IN6_ADDRLIST_READER_FOREACH(ia) { 1809 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1810 if (zoneid != 0 && 1811 zoneid != ia->ia_addr.sin6_scope_id) 1812 continue; 1813 ifaref(&ia->ia_ifa); 1814 break; 1815 } 1816 } 1817 pserialize_read_exit(s); 1818 1819 return ia; 1820 } 1821 1822 /* 1823 * find the internet address corresponding to a given interface and address. 1824 */ 1825 struct in6_ifaddr * 1826 in6ifa_ifpwithaddr(const struct ifnet *ifp, const struct in6_addr *addr) 1827 { 1828 struct ifaddr *best_ifa = NULL, *ifa; 1829 1830 IFADDR_READER_FOREACH(ifa, ifp) { 1831 if (ifa->ifa_addr->sa_family != AF_INET6) 1832 continue; 1833 if (!IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1834 continue; 1835 best_ifa = bestifa(best_ifa, ifa); 1836 } 1837 1838 return (struct in6_ifaddr *)best_ifa; 1839 } 1840 1841 struct in6_ifaddr * 1842 in6ifa_ifpwithaddr_psref(const struct ifnet *ifp, const struct in6_addr *addr, 1843 struct psref *psref) 1844 { 1845 struct in6_ifaddr *ia; 1846 int s = pserialize_read_enter(); 1847 1848 ia = in6ifa_ifpwithaddr(ifp, addr); 1849 if (ia != NULL) 1850 ia6_acquire(ia, psref); 1851 pserialize_read_exit(s); 1852 1853 return ia; 1854 } 1855 1856 static struct in6_ifaddr * 1857 bestia(struct in6_ifaddr *best_ia, struct in6_ifaddr *ia) 1858 { 1859 if (best_ia == NULL || 1860 best_ia->ia_ifa.ifa_preference < ia->ia_ifa.ifa_preference) 1861 return ia; 1862 return best_ia; 1863 } 1864 1865 /* 1866 * Convert IP6 address to printable (loggable) representation. 1867 */ 1868 char * 1869 ip6_sprintf(const struct in6_addr *addr) 1870 { 1871 static int ip6round = 0; 1872 static char ip6buf[8][INET6_ADDRSTRLEN]; 1873 char *cp = ip6buf[ip6round++ & 7]; 1874 1875 in6_print(cp, INET6_ADDRSTRLEN, addr); 1876 return cp; 1877 } 1878 1879 /* 1880 * Determine if an address is on a local network. 1881 */ 1882 int 1883 in6_localaddr(const struct in6_addr *in6) 1884 { 1885 struct in6_ifaddr *ia; 1886 int s; 1887 1888 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1889 return 1; 1890 1891 s = pserialize_read_enter(); 1892 IN6_ADDRLIST_READER_FOREACH(ia) { 1893 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1894 &ia->ia_prefixmask.sin6_addr)) { 1895 pserialize_read_exit(s); 1896 return 1; 1897 } 1898 } 1899 pserialize_read_exit(s); 1900 1901 return 0; 1902 } 1903 1904 int 1905 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1906 { 1907 struct in6_ifaddr *ia; 1908 int s; 1909 1910 s = pserialize_read_enter(); 1911 IN6_ADDRLIST_READER_FOREACH(ia) { 1912 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1913 &sa6->sin6_addr) && 1914 #ifdef SCOPEDROUTING 1915 ia->ia_addr.sin6_scope_id == sa6->sin6_scope_id && 1916 #endif 1917 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) { 1918 pserialize_read_exit(s); 1919 return 1; /* true */ 1920 } 1921 1922 /* XXX: do we still have to go thru the rest of the list? */ 1923 } 1924 pserialize_read_exit(s); 1925 1926 return 0; /* false */ 1927 } 1928 1929 /* 1930 * return length of part which dst and src are equal 1931 * hard coding... 1932 */ 1933 int 1934 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1935 { 1936 int match = 0; 1937 u_char *s = (u_char *)src, *d = (u_char *)dst; 1938 u_char *lim = s + 16, r; 1939 1940 while (s < lim) 1941 if ((r = (*d++ ^ *s++)) != 0) { 1942 while (r < 128) { 1943 match++; 1944 r <<= 1; 1945 } 1946 break; 1947 } else 1948 match += NBBY; 1949 return match; 1950 } 1951 1952 /* XXX: to be scope conscious */ 1953 int 1954 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1955 { 1956 int bytelen, bitlen; 1957 1958 /* sanity check */ 1959 if (len < 0 || len > 128) { 1960 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1961 len); 1962 return 0; 1963 } 1964 1965 bytelen = len / NBBY; 1966 bitlen = len % NBBY; 1967 1968 if (memcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1969 return 0; 1970 if (bitlen != 0 && 1971 p1->s6_addr[bytelen] >> (NBBY - bitlen) != 1972 p2->s6_addr[bytelen] >> (NBBY - bitlen)) 1973 return 0; 1974 1975 return 1; 1976 } 1977 1978 void 1979 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1980 { 1981 static const u_char maskarray[NBBY] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1982 int bytelen, bitlen, i; 1983 1984 /* sanity check */ 1985 if (len < 0 || len > 128) { 1986 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1987 len); 1988 return; 1989 } 1990 1991 memset(maskp, 0, sizeof(*maskp)); 1992 bytelen = len / NBBY; 1993 bitlen = len % NBBY; 1994 for (i = 0; i < bytelen; i++) 1995 maskp->s6_addr[i] = 0xff; 1996 if (bitlen) 1997 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1998 } 1999 2000 /* 2001 * return the best address out of the same scope. if no address was 2002 * found, return the first valid address from designated IF. 2003 */ 2004 struct in6_ifaddr * 2005 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2006 { 2007 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2008 struct ifaddr *ifa; 2009 struct in6_ifaddr *best_ia = NULL, *ia; 2010 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2011 2012 dep[0] = dep[1] = NULL; 2013 2014 /* 2015 * We first look for addresses in the same scope. 2016 * If there is one, return it. 2017 * If two or more, return one which matches the dst longest. 2018 * If none, return one of global addresses assigned other ifs. 2019 */ 2020 IFADDR_READER_FOREACH(ifa, ifp) { 2021 if (ifa->ifa_addr->sa_family != AF_INET6) 2022 continue; 2023 ia = (struct in6_ifaddr *)ifa; 2024 if (ia->ia6_flags & IN6_IFF_ANYCAST) 2025 continue; /* XXX: is there any case to allow anycast? */ 2026 if (ia->ia6_flags & IN6_IFF_NOTREADY) 2027 continue; /* don't use this interface */ 2028 if (ia->ia6_flags & IN6_IFF_DETACHED) 2029 continue; 2030 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2031 if (ip6_use_deprecated) 2032 dep[0] = ia; 2033 continue; 2034 } 2035 2036 if (dst_scope != in6_addrscope(IFA_IN6(ifa))) 2037 continue; 2038 /* 2039 * call in6_matchlen() as few as possible 2040 */ 2041 if (best_ia == NULL) { 2042 best_ia = ia; 2043 continue; 2044 } 2045 if (blen == -1) 2046 blen = in6_matchlen(&best_ia->ia_addr.sin6_addr, dst); 2047 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2048 if (tlen > blen) { 2049 blen = tlen; 2050 best_ia = ia; 2051 } else if (tlen == blen) 2052 best_ia = bestia(best_ia, ia); 2053 } 2054 if (best_ia != NULL) 2055 return best_ia; 2056 2057 IFADDR_READER_FOREACH(ifa, ifp) { 2058 if (ifa->ifa_addr->sa_family != AF_INET6) 2059 continue; 2060 ia = (struct in6_ifaddr *)ifa; 2061 if (ia->ia6_flags & IN6_IFF_ANYCAST) 2062 continue; /* XXX: is there any case to allow anycast? */ 2063 if (ia->ia6_flags & IN6_IFF_NOTREADY) 2064 continue; /* don't use this interface */ 2065 if (ia->ia6_flags & IN6_IFF_DETACHED) 2066 continue; 2067 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2068 if (ip6_use_deprecated) 2069 dep[1] = (struct in6_ifaddr *)ifa; 2070 continue; 2071 } 2072 2073 best_ia = bestia(best_ia, ia); 2074 } 2075 if (best_ia != NULL) 2076 return best_ia; 2077 2078 /* use the last-resort values, that are, deprecated addresses */ 2079 if (dep[0]) 2080 return dep[0]; 2081 if (dep[1]) 2082 return dep[1]; 2083 2084 return NULL; 2085 } 2086 2087 /* 2088 * perform DAD when interface becomes IFF_UP. 2089 */ 2090 void 2091 in6_if_link_up(struct ifnet *ifp) 2092 { 2093 struct ifaddr *ifa; 2094 struct in6_ifaddr *ia; 2095 int s, bound; 2096 2097 /* Ensure it's sane to run DAD */ 2098 if (ifp->if_link_state == LINK_STATE_DOWN) 2099 return; 2100 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 2101 return; 2102 2103 bound = curlwp_bind(); 2104 s = pserialize_read_enter(); 2105 IFADDR_READER_FOREACH(ifa, ifp) { 2106 struct psref psref; 2107 2108 if (ifa->ifa_addr->sa_family != AF_INET6) 2109 continue; 2110 2111 ifa_acquire(ifa, &psref); 2112 pserialize_read_exit(s); 2113 ia = (struct in6_ifaddr *)ifa; 2114 2115 /* If detached then mark as tentative */ 2116 if (ia->ia6_flags & IN6_IFF_DETACHED) { 2117 ia->ia6_flags &= ~IN6_IFF_DETACHED; 2118 if (if_do_dad(ifp)) { 2119 ia->ia6_flags |= IN6_IFF_TENTATIVE; 2120 nd6log(LOG_ERR, "%s marked tentative\n", 2121 ip6_sprintf(&ia->ia_addr.sin6_addr)); 2122 } else if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) 2123 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 2124 } 2125 2126 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2127 int rand_delay; 2128 2129 /* Clear the duplicated flag as we're starting DAD. */ 2130 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; 2131 2132 /* 2133 * The TENTATIVE flag was likely set by hand 2134 * beforehand, implicitly indicating the need for DAD. 2135 * We may be able to skip the random delay in this 2136 * case, but we impose delays just in case. 2137 */ 2138 rand_delay = cprng_fast32() % 2139 (MAX_RTR_SOLICITATION_DELAY * hz); 2140 /* +1 ensures callout is always used */ 2141 nd6_dad_start(ifa, rand_delay + 1); 2142 } 2143 2144 s = pserialize_read_enter(); 2145 ifa_release(ifa, &psref); 2146 } 2147 pserialize_read_exit(s); 2148 curlwp_bindx(bound); 2149 2150 /* Restore any detached prefixes */ 2151 pfxlist_onlink_check(); 2152 } 2153 2154 void 2155 in6_if_up(struct ifnet *ifp) 2156 { 2157 2158 /* 2159 * special cases, like 6to4, are handled in in6_ifattach 2160 */ 2161 in6_ifattach(ifp, NULL); 2162 2163 /* interface may not support link state, so bring it up also */ 2164 in6_if_link_up(ifp); 2165 } 2166 2167 /* 2168 * Mark all addresses as detached. 2169 */ 2170 void 2171 in6_if_link_down(struct ifnet *ifp) 2172 { 2173 struct ifaddr *ifa; 2174 struct in6_ifaddr *ia; 2175 int s, bound; 2176 2177 /* Any prefixes on this interface should be detached as well */ 2178 pfxlist_onlink_check(); 2179 2180 bound = curlwp_bind(); 2181 s = pserialize_read_enter(); 2182 IFADDR_READER_FOREACH(ifa, ifp) { 2183 struct psref psref; 2184 2185 if (ifa->ifa_addr->sa_family != AF_INET6) 2186 continue; 2187 2188 ifa_acquire(ifa, &psref); 2189 pserialize_read_exit(s); 2190 ia = (struct in6_ifaddr *)ifa; 2191 2192 /* Stop DAD processing */ 2193 nd6_dad_stop(ifa); 2194 2195 /* 2196 * Mark the address as detached. 2197 * This satisfies RFC4862 Section 5.3, but we should apply 2198 * this logic to all addresses to be a good citizen and 2199 * avoid potential duplicated addresses. 2200 * When the interface comes up again, detached addresses 2201 * are marked tentative and DAD commences. 2202 */ 2203 if (!(ia->ia6_flags & IN6_IFF_DETACHED)) { 2204 nd6log(LOG_DEBUG, "%s marked detached\n", 2205 ip6_sprintf(&ia->ia_addr.sin6_addr)); 2206 ia->ia6_flags |= IN6_IFF_DETACHED; 2207 ia->ia6_flags &= 2208 ~(IN6_IFF_TENTATIVE | IN6_IFF_DUPLICATED); 2209 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 2210 } 2211 2212 s = pserialize_read_enter(); 2213 ifa_release(ifa, &psref); 2214 } 2215 pserialize_read_exit(s); 2216 curlwp_bindx(bound); 2217 } 2218 2219 void 2220 in6_if_down(struct ifnet *ifp) 2221 { 2222 2223 in6_if_link_down(ifp); 2224 } 2225 2226 void 2227 in6_if_link_state_change(struct ifnet *ifp, int link_state) 2228 { 2229 2230 switch (link_state) { 2231 case LINK_STATE_DOWN: 2232 in6_if_link_down(ifp); 2233 break; 2234 case LINK_STATE_UP: 2235 in6_if_link_up(ifp); 2236 break; 2237 } 2238 } 2239 2240 /* 2241 * Calculate max IPv6 MTU through all the interfaces and store it 2242 * to in6_maxmtu. 2243 */ 2244 void 2245 in6_setmaxmtu(void) 2246 { 2247 unsigned long maxmtu = 0; 2248 struct ifnet *ifp; 2249 int s; 2250 2251 s = pserialize_read_enter(); 2252 IFNET_READER_FOREACH(ifp) { 2253 /* this function can be called during ifnet initialization */ 2254 if (!ifp->if_afdata[AF_INET6]) 2255 continue; 2256 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2257 IN6_LINKMTU(ifp) > maxmtu) 2258 maxmtu = IN6_LINKMTU(ifp); 2259 } 2260 pserialize_read_exit(s); 2261 if (maxmtu) /* update only when maxmtu is positive */ 2262 in6_maxmtu = maxmtu; 2263 } 2264 2265 /* 2266 * Provide the length of interface identifiers to be used for the link attached 2267 * to the given interface. The length should be defined in "IPv6 over 2268 * xxx-link" document. Note that address architecture might also define 2269 * the length for a particular set of address prefixes, regardless of the 2270 * link type. As clarified in rfc2462bis, those two definitions should be 2271 * consistent, and those really are as of August 2004. 2272 */ 2273 int 2274 in6_if2idlen(struct ifnet *ifp) 2275 { 2276 switch (ifp->if_type) { 2277 case IFT_ETHER: /* RFC2464 */ 2278 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2279 case IFT_L2VLAN: /* ditto */ 2280 case IFT_IEEE80211: /* ditto */ 2281 case IFT_FDDI: /* RFC2467 */ 2282 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 2283 case IFT_PPP: /* RFC2472 */ 2284 case IFT_ARCNET: /* RFC2497 */ 2285 case IFT_FRELAY: /* RFC2590 */ 2286 case IFT_IEEE1394: /* RFC3146 */ 2287 case IFT_GIF: /* draft-ietf-v6ops-mech-v2-07 */ 2288 case IFT_LOOP: /* XXX: is this really correct? */ 2289 return 64; 2290 default: 2291 /* 2292 * Unknown link type: 2293 * It might be controversial to use the today's common constant 2294 * of 64 for these cases unconditionally. For full compliance, 2295 * we should return an error in this case. On the other hand, 2296 * if we simply miss the standard for the link type or a new 2297 * standard is defined for a new link type, the IFID length 2298 * is very likely to be the common constant. As a compromise, 2299 * we always use the constant, but make an explicit notice 2300 * indicating the "unknown" case. 2301 */ 2302 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2303 return 64; 2304 } 2305 } 2306 2307 struct in6_llentry { 2308 struct llentry base; 2309 }; 2310 2311 #define IN6_LLTBL_DEFAULT_HSIZE 32 2312 #define IN6_LLTBL_HASH(k, h) \ 2313 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 2314 2315 /* 2316 * Do actual deallocation of @lle. 2317 * Called by LLE_FREE_LOCKED when number of references 2318 * drops to zero. 2319 */ 2320 static void 2321 in6_lltable_destroy_lle(struct llentry *lle) 2322 { 2323 2324 LLE_WUNLOCK(lle); 2325 LLE_LOCK_DESTROY(lle); 2326 kmem_intr_free(lle, sizeof(struct in6_llentry)); 2327 } 2328 2329 static struct llentry * 2330 in6_lltable_new(const struct in6_addr *addr6, u_int flags) 2331 { 2332 struct in6_llentry *lle; 2333 2334 lle = kmem_intr_zalloc(sizeof(struct in6_llentry), KM_NOSLEEP); 2335 if (lle == NULL) /* NB: caller generates msg */ 2336 return NULL; 2337 2338 lle->base.r_l3addr.addr6 = *addr6; 2339 lle->base.lle_refcnt = 1; 2340 lle->base.lle_free = in6_lltable_destroy_lle; 2341 LLE_LOCK_INIT(&lle->base); 2342 callout_init(&lle->base.lle_timer, CALLOUT_MPSAFE); 2343 2344 return &lle->base; 2345 } 2346 2347 static int 2348 in6_lltable_match_prefix(const struct sockaddr *prefix, 2349 const struct sockaddr *mask, u_int flags, struct llentry *lle) 2350 { 2351 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix; 2352 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask; 2353 2354 if (IN6_ARE_MASKED_ADDR_EQUAL(&lle->r_l3addr.addr6, 2355 &pfx->sin6_addr, &msk->sin6_addr) && 2356 ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) 2357 return 1; 2358 2359 return 0; 2360 } 2361 2362 static void 2363 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle) 2364 { 2365 struct ifnet *ifp __diagused; 2366 2367 LLE_WLOCK_ASSERT(lle); 2368 KASSERT(llt != NULL); 2369 2370 /* Unlink entry from table */ 2371 if ((lle->la_flags & LLE_LINKED) != 0) { 2372 2373 ifp = llt->llt_ifp; 2374 IF_AFDATA_WLOCK_ASSERT(ifp); 2375 lltable_unlink_entry(llt, lle); 2376 } 2377 2378 KASSERT(mutex_owned(softnet_lock)); 2379 callout_halt(&lle->lle_timer, softnet_lock); 2380 LLE_REMREF(lle); 2381 2382 llentry_free(lle); 2383 } 2384 2385 static int 2386 in6_lltable_rtcheck(struct ifnet *ifp, 2387 u_int flags, 2388 const struct sockaddr *l3addr) 2389 { 2390 struct rtentry *rt; 2391 2392 KASSERTMSG(l3addr->sa_family == AF_INET6, 2393 "sin_family %d", l3addr->sa_family); 2394 2395 rt = rtalloc1(l3addr, 0); 2396 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 2397 int s; 2398 struct ifaddr *ifa; 2399 /* 2400 * Create an ND6 cache for an IPv6 neighbor 2401 * that is not covered by our own prefix. 2402 */ 2403 /* XXX ifaof_ifpforaddr should take a const param */ 2404 s = pserialize_read_enter(); 2405 ifa = ifaof_ifpforaddr(l3addr, ifp); 2406 if (ifa != NULL) { 2407 pserialize_read_exit(s); 2408 if (rt != NULL) 2409 rtfree(rt); 2410 return 0; 2411 } 2412 pserialize_read_exit(s); 2413 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2414 ip6_sprintf(&((const struct sockaddr_in6 *)l3addr)->sin6_addr)); 2415 if (rt != NULL) 2416 rtfree(rt); 2417 return EINVAL; 2418 } 2419 rtfree(rt); 2420 return 0; 2421 } 2422 2423 static inline uint32_t 2424 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize) 2425 { 2426 2427 return IN6_LLTBL_HASH(dst->s6_addr32[3], hsize); 2428 } 2429 2430 static uint32_t 2431 in6_lltable_hash(const struct llentry *lle, uint32_t hsize) 2432 { 2433 2434 return in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize); 2435 } 2436 2437 static void 2438 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 2439 { 2440 struct sockaddr_in6 *sin6; 2441 2442 sin6 = (struct sockaddr_in6 *)sa; 2443 bzero(sin6, sizeof(*sin6)); 2444 sin6->sin6_family = AF_INET6; 2445 sin6->sin6_len = sizeof(*sin6); 2446 sin6->sin6_addr = lle->r_l3addr.addr6; 2447 } 2448 2449 static inline struct llentry * 2450 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst) 2451 { 2452 struct llentry *lle; 2453 struct llentries *lleh; 2454 u_int hashidx; 2455 2456 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize); 2457 lleh = &llt->lle_head[hashidx]; 2458 LIST_FOREACH(lle, lleh, lle_next) { 2459 if (lle->la_flags & LLE_DELETED) 2460 continue; 2461 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst)) 2462 break; 2463 } 2464 2465 return lle; 2466 } 2467 2468 static int 2469 in6_lltable_delete(struct lltable *llt, u_int flags, 2470 const struct sockaddr *l3addr) 2471 { 2472 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2473 struct llentry *lle; 2474 2475 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp); 2476 KASSERTMSG(l3addr->sa_family == AF_INET6, 2477 "sin_family %d", l3addr->sa_family); 2478 2479 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2480 2481 if (lle == NULL) 2482 return ENOENT; 2483 2484 LLE_WLOCK(lle); 2485 lle->la_flags |= LLE_DELETED; 2486 #ifdef DIAGNOSTIC 2487 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2488 #endif 2489 if ((lle->la_flags & (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC) 2490 llentry_free(lle); 2491 else 2492 LLE_WUNLOCK(lle); 2493 2494 return 0; 2495 } 2496 2497 static struct llentry * 2498 in6_lltable_create(struct lltable *llt, u_int flags, 2499 const struct sockaddr *l3addr) 2500 { 2501 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2502 struct ifnet *ifp = llt->llt_ifp; 2503 struct llentry *lle; 2504 2505 IF_AFDATA_WLOCK_ASSERT(ifp); 2506 KASSERTMSG(l3addr->sa_family == AF_INET6, 2507 "sin_family %d", l3addr->sa_family); 2508 2509 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2510 2511 if (lle != NULL) { 2512 LLE_WLOCK(lle); 2513 return lle; 2514 } 2515 2516 /* 2517 * A route that covers the given address must have 2518 * been installed 1st because we are doing a resolution, 2519 * verify this. 2520 */ 2521 if (!(flags & LLE_IFADDR) && 2522 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2523 return NULL; 2524 2525 lle = in6_lltable_new(&sin6->sin6_addr, flags); 2526 if (lle == NULL) { 2527 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2528 return NULL; 2529 } 2530 lle->la_flags = flags; 2531 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 2532 memcpy(&lle->ll_addr, CLLADDR(ifp->if_sadl), ifp->if_addrlen); 2533 lle->la_flags |= LLE_VALID; 2534 } 2535 2536 lltable_link_entry(llt, lle); 2537 LLE_WLOCK(lle); 2538 2539 return lle; 2540 } 2541 2542 static struct llentry * 2543 in6_lltable_lookup(struct lltable *llt, u_int flags, 2544 const struct sockaddr *l3addr) 2545 { 2546 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2547 struct llentry *lle; 2548 2549 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 2550 KASSERTMSG(l3addr->sa_family == AF_INET6, 2551 "sin_family %d", l3addr->sa_family); 2552 2553 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2554 2555 if (lle == NULL) 2556 return NULL; 2557 2558 if (flags & LLE_EXCLUSIVE) 2559 LLE_WLOCK(lle); 2560 else 2561 LLE_RLOCK(lle); 2562 return lle; 2563 } 2564 2565 static int 2566 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 2567 struct rt_walkarg *w) 2568 { 2569 struct sockaddr_in6 sin6; 2570 2571 LLTABLE_LOCK_ASSERT(); 2572 2573 /* skip deleted entries */ 2574 if (lle->la_flags & LLE_DELETED) 2575 return 0; 2576 2577 sockaddr_in6_init(&sin6, &lle->r_l3addr.addr6, 0, 0, 0); 2578 2579 return lltable_dump_entry(llt, lle, w, sin6tosa(&sin6)); 2580 } 2581 2582 static struct lltable * 2583 in6_lltattach(struct ifnet *ifp) 2584 { 2585 struct lltable *llt; 2586 2587 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE); 2588 llt->llt_af = AF_INET6; 2589 llt->llt_ifp = ifp; 2590 2591 llt->llt_lookup = in6_lltable_lookup; 2592 llt->llt_create = in6_lltable_create; 2593 llt->llt_delete = in6_lltable_delete; 2594 llt->llt_dump_entry = in6_lltable_dump_entry; 2595 llt->llt_hash = in6_lltable_hash; 2596 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry; 2597 llt->llt_free_entry = in6_lltable_free_entry; 2598 llt->llt_match_prefix = in6_lltable_match_prefix; 2599 lltable_link(llt); 2600 2601 return llt; 2602 } 2603 2604 void * 2605 in6_domifattach(struct ifnet *ifp) 2606 { 2607 struct in6_ifextra *ext; 2608 2609 ext = malloc(sizeof(*ext), M_IFADDR, M_WAITOK|M_ZERO); 2610 2611 ext->in6_ifstat = malloc(sizeof(struct in6_ifstat), 2612 M_IFADDR, M_WAITOK|M_ZERO); 2613 2614 ext->icmp6_ifstat = malloc(sizeof(struct icmp6_ifstat), 2615 M_IFADDR, M_WAITOK|M_ZERO); 2616 2617 ext->nd_ifinfo = nd6_ifattach(ifp); 2618 ext->scope6_id = scope6_ifattach(ifp); 2619 ext->nprefixes = 0; 2620 ext->ndefrouters = 0; 2621 2622 ext->lltable = in6_lltattach(ifp); 2623 2624 return ext; 2625 } 2626 2627 void 2628 in6_domifdetach(struct ifnet *ifp, void *aux) 2629 { 2630 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2631 2632 lltable_free(ext->lltable); 2633 ext->lltable = NULL; 2634 nd6_ifdetach(ifp, ext); 2635 free(ext->in6_ifstat, M_IFADDR); 2636 free(ext->icmp6_ifstat, M_IFADDR); 2637 scope6_ifdetach(ext->scope6_id); 2638 free(ext, M_IFADDR); 2639 } 2640 2641 /* 2642 * Convert IPv4 address stored in struct in_addr to IPv4-Mapped IPv6 address 2643 * stored in struct in6_addr as defined in RFC 4921 section 2.5.5.2. 2644 */ 2645 void 2646 in6_in_2_v4mapin6(const struct in_addr *in, struct in6_addr *in6) 2647 { 2648 in6->s6_addr32[0] = 0; 2649 in6->s6_addr32[1] = 0; 2650 in6->s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2651 in6->s6_addr32[3] = in->s_addr; 2652 } 2653 2654 /* 2655 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2656 * v4 mapped addr or v4 compat addr 2657 */ 2658 void 2659 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2660 { 2661 memset(sin, 0, sizeof(*sin)); 2662 sin->sin_len = sizeof(struct sockaddr_in); 2663 sin->sin_family = AF_INET; 2664 sin->sin_port = sin6->sin6_port; 2665 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2666 } 2667 2668 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2669 void 2670 in6_sin_2_v4mapsin6(const struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2671 { 2672 memset(sin6, 0, sizeof(*sin6)); 2673 sin6->sin6_len = sizeof(struct sockaddr_in6); 2674 sin6->sin6_family = AF_INET6; 2675 sin6->sin6_port = sin->sin_port; 2676 in6_in_2_v4mapin6(&sin->sin_addr, &sin6->sin6_addr); 2677 } 2678 2679 /* Convert sockaddr_in6 into sockaddr_in. */ 2680 void 2681 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2682 { 2683 struct sockaddr_in *sin_p; 2684 struct sockaddr_in6 sin6; 2685 2686 /* 2687 * Save original sockaddr_in6 addr and convert it 2688 * to sockaddr_in. 2689 */ 2690 sin6 = *(struct sockaddr_in6 *)nam; 2691 sin_p = (struct sockaddr_in *)nam; 2692 in6_sin6_2_sin(sin_p, &sin6); 2693 } 2694 2695 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2696 void 2697 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2698 { 2699 struct sockaddr_in *sin_p; 2700 struct sockaddr_in6 *sin6_p; 2701 2702 sin6_p = malloc(sizeof(*sin6_p), M_SONAME, M_WAITOK); 2703 sin_p = (struct sockaddr_in *)*nam; 2704 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2705 free(*nam, M_SONAME); 2706 *nam = sin6tosa(sin6_p); 2707 } 2708