1 /* $NetBSD: in6.c,v 1.281 2020/06/16 17:12:18 maxv 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 1.281 2020/06/16 17:12:18 maxv Exp $"); 66 67 #ifdef _KERNEL_OPT 68 #include "opt_inet.h" 69 #include "opt_compat_netbsd.h" 70 #include "opt_net_mpsafe.h" 71 #endif 72 73 #include <sys/param.h> 74 #include <sys/ioctl.h> 75 #include <sys/errno.h> 76 #include <sys/malloc.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/sockio.h> 80 #include <sys/systm.h> 81 #include <sys/proc.h> 82 #include <sys/time.h> 83 #include <sys/kernel.h> 84 #include <sys/syslog.h> 85 #include <sys/kauth.h> 86 #include <sys/cprng.h> 87 #include <sys/kmem.h> 88 89 #include <net/if.h> 90 #include <net/if_types.h> 91 #include <net/if_llatbl.h> 92 #include <net/if_ether.h> 93 #include <net/if_dl.h> 94 #include <net/pfil.h> 95 #include <net/route.h> 96 97 #include <netinet/in.h> 98 #include <netinet/in_var.h> 99 100 #include <netinet/ip6.h> 101 #include <netinet6/ip6_var.h> 102 #include <netinet6/nd6.h> 103 #include <netinet6/mld6_var.h> 104 #include <netinet6/ip6_mroute.h> 105 #include <netinet6/in6_ifattach.h> 106 #include <netinet6/scope6_var.h> 107 108 #ifdef COMPAT_50 109 #include <compat/netinet6/in6_var.h> 110 #endif 111 #ifdef COMPAT_90 112 #include <compat/netinet6/in6_var.h> 113 #include <compat/netinet6/nd6.h> 114 #endif 115 116 MALLOC_DEFINE(M_IP6OPT, "ip6_options", "IPv6 options"); 117 118 /* enable backward compatibility code for obsoleted ioctls */ 119 #define COMPAT_IN6IFIOCTL 120 121 #ifdef IN6_DEBUG 122 #define IN6_DPRINTF(__fmt, ...) printf(__fmt, __VA_ARGS__) 123 #else 124 #define IN6_DPRINTF(__fmt, ...) do { } while (/*CONSTCOND*/0) 125 #endif /* IN6_DEBUG */ 126 127 /* 128 * Definitions of some constant IP6 addresses. 129 */ 130 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 131 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 132 const struct in6_addr in6addr_nodelocal_allnodes = 133 IN6ADDR_NODELOCAL_ALLNODES_INIT; 134 const struct in6_addr in6addr_linklocal_allnodes = 135 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 136 const struct in6_addr in6addr_linklocal_allrouters = 137 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 138 139 const struct in6_addr in6mask0 = IN6MASK0; 140 const struct in6_addr in6mask32 = IN6MASK32; 141 const struct in6_addr in6mask64 = IN6MASK64; 142 const struct in6_addr in6mask96 = IN6MASK96; 143 const struct in6_addr in6mask128 = IN6MASK128; 144 145 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6, 146 0, 0, IN6ADDR_ANY_INIT, 0}; 147 148 struct pslist_head in6_ifaddr_list; 149 kmutex_t in6_ifaddr_lock; 150 151 static int in6_lifaddr_ioctl(struct socket *, u_long, void *, 152 struct ifnet *); 153 static int in6_ifaddprefix(struct in6_ifaddr *); 154 static int in6_ifremprefix(struct in6_ifaddr *); 155 static int in6_ifinit(struct ifnet *, struct in6_ifaddr *, 156 const struct sockaddr_in6 *, int); 157 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 158 static int in6_update_ifa1(struct ifnet *, struct in6_aliasreq *, 159 struct in6_ifaddr **, struct psref *, int); 160 161 void 162 in6_init(void) 163 { 164 165 PSLIST_INIT(&in6_ifaddr_list); 166 mutex_init(&in6_ifaddr_lock, MUTEX_DEFAULT, IPL_NONE); 167 168 in6_sysctl_multicast_setup(NULL); 169 } 170 171 /* 172 * Add ownaddr as loopback rtentry. We previously add the route only if 173 * necessary (ex. on a p2p link). However, since we now manage addresses 174 * separately from prefixes, we should always add the route. We can't 175 * rely on the cloning mechanism from the corresponding interface route 176 * any more. 177 */ 178 void 179 in6_ifaddlocal(struct ifaddr *ifa) 180 { 181 182 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &in6addr_any) || 183 (ifa->ifa_ifp->if_flags & IFF_POINTOPOINT && 184 IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), IFA_DSTIN6(ifa)))) 185 { 186 rt_addrmsg(RTM_NEWADDR, ifa); 187 return; 188 } 189 190 rt_ifa_addlocal(ifa); 191 } 192 193 /* 194 * Remove loopback rtentry of ownaddr generated by in6_ifaddlocal(), 195 * if it exists. 196 */ 197 void 198 in6_ifremlocal(struct ifaddr *ifa) 199 { 200 struct in6_ifaddr *ia; 201 struct ifaddr *alt_ifa = NULL; 202 int ia_count = 0; 203 struct psref psref; 204 int s; 205 206 /* 207 * Some of BSD variants do not remove cloned routes 208 * from an interface direct route, when removing the direct route 209 * (see comments in net/net_osdep.h). Even for variants that do remove 210 * cloned routes, they could fail to remove the cloned routes when 211 * we handle multple addresses that share a common prefix. 212 * So, we should remove the route corresponding to the deleted address. 213 */ 214 215 /* 216 * Delete the entry only if exactly one ifaddr matches the 217 * address, ifa->ifa_addr. 218 * 219 * If more than one ifaddr matches, replace the ifaddr in 220 * the routing table, rt_ifa, with a different ifaddr than 221 * the one we are purging, ifa. It is important to do 222 * this, or else the routing table can accumulate dangling 223 * pointers rt->rt_ifa->ifa_ifp to destroyed interfaces, 224 * which will lead to crashes, later. (More than one ifaddr 225 * can match if we assign the same address to multiple---probably 226 * p2p---interfaces.) 227 * 228 * XXX An old comment at this place said, "we should avoid 229 * XXX such a configuration [i.e., interfaces with the same 230 * XXX addressed assigned --ed.] in IPv6...". I do not 231 * XXX agree, especially now that I have fixed the dangling 232 * XXX ifp-pointers bug. 233 */ 234 s = pserialize_read_enter(); 235 IN6_ADDRLIST_READER_FOREACH(ia) { 236 if (!IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) 237 continue; 238 if (ia->ia_ifp != ifa->ifa_ifp) 239 alt_ifa = &ia->ia_ifa; 240 if (++ia_count > 1 && alt_ifa != NULL) 241 break; 242 } 243 if (ia_count > 1 && alt_ifa != NULL) 244 ifa_acquire(alt_ifa, &psref); 245 pserialize_read_exit(s); 246 247 if (ia_count == 0) 248 return; 249 250 rt_ifa_remlocal(ifa, ia_count == 1 ? NULL : alt_ifa); 251 252 if (ia_count > 1 && alt_ifa != NULL) 253 ifa_release(alt_ifa, &psref); 254 } 255 256 /* Add prefix route for the network. */ 257 static int 258 in6_ifaddprefix(struct in6_ifaddr *ia) 259 { 260 int error, flags = 0; 261 262 if (in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) == 128) { 263 if (ia->ia_dstaddr.sin6_family != AF_INET6) 264 /* We don't need to install a host route. */ 265 return 0; 266 flags |= RTF_HOST; 267 } 268 269 /* Is this a connected route for neighbour discovery? */ 270 if (nd6_need_cache(ia->ia_ifp)) 271 flags |= RTF_CONNECTED; 272 273 if ((error = rtinit(&ia->ia_ifa, RTM_ADD, RTF_UP | flags)) == 0) 274 ia->ia_flags |= IFA_ROUTE; 275 else if (error == EEXIST) 276 /* Existance of the route is not an error. */ 277 error = 0; 278 279 return error; 280 } 281 282 /* Delete network prefix route if present. 283 * Re-add it to another address if the prefix matches. */ 284 static int 285 in6_ifremprefix(struct in6_ifaddr *target) 286 { 287 int error, s; 288 struct in6_ifaddr *ia; 289 290 if ((target->ia_flags & IFA_ROUTE) == 0) 291 return 0; 292 293 s = pserialize_read_enter(); 294 IN6_ADDRLIST_READER_FOREACH(ia) { 295 if (target->ia_dstaddr.sin6_len) { 296 if (ia->ia_dstaddr.sin6_len == 0 || 297 !IN6_ARE_ADDR_EQUAL(&ia->ia_dstaddr.sin6_addr, 298 &target->ia_dstaddr.sin6_addr)) 299 continue; 300 } else { 301 if (!IN6_ARE_MASKED_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 302 &target->ia_addr.sin6_addr, 303 &target->ia_prefixmask.sin6_addr)) 304 continue; 305 } 306 307 /* 308 * if we got a matching prefix route, move IFA_ROUTE to him 309 */ 310 if ((ia->ia_flags & IFA_ROUTE) == 0) { 311 struct psref psref; 312 int bound = curlwp_bind(); 313 314 ia6_acquire(ia, &psref); 315 pserialize_read_exit(s); 316 317 rtinit(&target->ia_ifa, RTM_DELETE, 0); 318 target->ia_flags &= ~IFA_ROUTE; 319 320 error = in6_ifaddprefix(ia); 321 322 ia6_release(ia, &psref); 323 curlwp_bindx(bound); 324 325 return error; 326 } 327 } 328 pserialize_read_exit(s); 329 330 /* 331 * noone seem to have prefix route. remove it. 332 */ 333 rtinit(&target->ia_ifa, RTM_DELETE, 0); 334 target->ia_flags &= ~IFA_ROUTE; 335 return 0; 336 } 337 338 int 339 in6_mask2len(struct in6_addr *mask, u_char *lim0) 340 { 341 int x = 0, y; 342 u_char *lim = lim0, *p; 343 344 /* ignore the scope_id part */ 345 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 346 lim = (u_char *)mask + sizeof(*mask); 347 for (p = (u_char *)mask; p < lim; x++, p++) { 348 if (*p != 0xff) 349 break; 350 } 351 y = 0; 352 if (p < lim) { 353 for (y = 0; y < NBBY; y++) { 354 if ((*p & (0x80 >> y)) == 0) 355 break; 356 } 357 } 358 359 /* 360 * when the limit pointer is given, do a stricter check on the 361 * remaining bits. 362 */ 363 if (p < lim) { 364 if (y != 0 && (*p & (0x00ff >> y)) != 0) 365 return -1; 366 for (p = p + 1; p < lim; p++) 367 if (*p != 0) 368 return -1; 369 } 370 371 return x * NBBY + y; 372 } 373 374 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 375 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 376 377 static int 378 in6_control1(struct socket *so, u_long cmd, void *data, struct ifnet *ifp) 379 { 380 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 381 struct in6_ifaddr *ia = NULL; 382 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 383 struct sockaddr_in6 *sa6; 384 int error, bound; 385 struct psref psref; 386 387 switch (cmd) { 388 case SIOCAADDRCTL_POLICY: 389 case SIOCDADDRCTL_POLICY: 390 /* Privileged. */ 391 return in6_src_ioctl(cmd, data); 392 /* 393 * XXX: Fix me, once we fix SIOCSIFADDR, SIOCIFDSTADDR, etc. 394 */ 395 case SIOCSIFADDR: 396 case SIOCSIFDSTADDR: 397 case SIOCSIFBRDADDR: 398 case SIOCSIFNETMASK: 399 return EOPNOTSUPP; 400 case SIOCGETSGCNT_IN6: 401 case SIOCGETMIFCNT_IN6: 402 return mrt6_ioctl(cmd, data); 403 case SIOCGIFADDRPREF: 404 case SIOCSIFADDRPREF: 405 if (ifp == NULL) 406 return EINVAL; 407 return ifaddrpref_ioctl(so, cmd, data, ifp); 408 } 409 410 if (ifp == NULL) 411 return EOPNOTSUPP; 412 413 switch (cmd) { 414 #ifdef OSIOCSIFINFO_IN6_90 415 case OSIOCSIFINFO_FLAGS_90: 416 case OSIOCSIFINFO_IN6_90: 417 case OSIOCSDEFIFACE_IN6: 418 case OSIOCSNDFLUSH_IN6: 419 case OSIOCSPFXFLUSH_IN6: 420 case OSIOCSRTRFLUSH_IN6: 421 #endif 422 case SIOCSIFINFO_FLAGS: 423 case SIOCSIFINFO_IN6: 424 /* Privileged. */ 425 /* FALLTHROUGH */ 426 #ifdef OSIOCGIFINFO_IN6 427 case OSIOCGIFINFO_IN6: 428 #endif 429 #ifdef OSIOCGIFINFO_IN6_90 430 case OSIOCGDRLST_IN6: 431 case OSIOCGPRLST_IN6: 432 case OSIOCGIFINFO_IN6_90: 433 case OSIOCGDEFIFACE_IN6: 434 #endif 435 case SIOCGIFINFO_IN6: 436 case SIOCGNBRINFO_IN6: 437 return nd6_ioctl(cmd, data, ifp); 438 } 439 440 switch (cmd) { 441 case SIOCALIFADDR: 442 case SIOCDLIFADDR: 443 /* Privileged. */ 444 /* FALLTHROUGH */ 445 case SIOCGLIFADDR: 446 return in6_lifaddr_ioctl(so, cmd, data, ifp); 447 } 448 449 /* 450 * Find address for this interface, if it exists. 451 * 452 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 453 * only, and used the first interface address as the target of other 454 * operations (without checking ifra_addr). This was because netinet 455 * code/API assumed at most 1 interface address per interface. 456 * Since IPv6 allows a node to assign multiple addresses 457 * on a single interface, we almost always look and check the 458 * presence of ifra_addr, and reject invalid ones here. 459 * It also decreases duplicated code among SIOC*_IN6 operations. 460 */ 461 switch (cmd) { 462 case SIOCAIFADDR_IN6: 463 #ifdef OSIOCAIFADDR_IN6 464 case OSIOCAIFADDR_IN6: 465 #endif 466 #ifdef OSIOCSIFPHYADDR_IN6 467 case OSIOCSIFPHYADDR_IN6: 468 #endif 469 case SIOCSIFPHYADDR_IN6: 470 sa6 = &ifra->ifra_addr; 471 break; 472 case SIOCSIFADDR_IN6: 473 case SIOCGIFADDR_IN6: 474 case SIOCSIFDSTADDR_IN6: 475 case SIOCSIFNETMASK_IN6: 476 case SIOCGIFDSTADDR_IN6: 477 case SIOCGIFNETMASK_IN6: 478 case SIOCDIFADDR_IN6: 479 case SIOCGIFPSRCADDR_IN6: 480 case SIOCGIFPDSTADDR_IN6: 481 case SIOCGIFAFLAG_IN6: 482 case SIOCGIFALIFETIME_IN6: 483 #ifdef OSIOCGIFALIFETIME_IN6 484 case OSIOCGIFALIFETIME_IN6: 485 #endif 486 case SIOCGIFSTAT_IN6: 487 case SIOCGIFSTAT_ICMP6: 488 sa6 = &ifr->ifr_addr; 489 break; 490 default: 491 sa6 = NULL; 492 break; 493 } 494 495 error = 0; 496 bound = curlwp_bind(); 497 if (sa6 && sa6->sin6_family == AF_INET6) { 498 if (sa6->sin6_scope_id != 0) 499 error = sa6_embedscope(sa6, 0); 500 else 501 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 502 if (error != 0) 503 goto out; 504 ia = in6ifa_ifpwithaddr_psref(ifp, &sa6->sin6_addr, &psref); 505 } else 506 ia = NULL; 507 508 switch (cmd) { 509 case SIOCSIFADDR_IN6: 510 case SIOCSIFDSTADDR_IN6: 511 case SIOCSIFNETMASK_IN6: 512 /* 513 * Since IPv6 allows a node to assign multiple addresses 514 * on a single interface, SIOCSIFxxx ioctls are deprecated. 515 */ 516 error = EINVAL; 517 goto release; 518 519 case SIOCDIFADDR_IN6: 520 /* 521 * for IPv4, we look for existing in_ifaddr here to allow 522 * "ifconfig if0 delete" to remove the first IPv4 address on 523 * the interface. For IPv6, as the spec allows multiple 524 * interface address from the day one, we consider "remove the 525 * first one" semantics to be not preferable. 526 */ 527 if (ia == NULL) { 528 error = EADDRNOTAVAIL; 529 goto out; 530 } 531 #ifdef OSIOCAIFADDR_IN6 532 /* FALLTHROUGH */ 533 case OSIOCAIFADDR_IN6: 534 #endif 535 /* FALLTHROUGH */ 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)~(1ULL << ((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)~(1ULL << ((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 #endif 676 /*FALLTHROUGH*/ 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 error = EINVAL; 687 break; 688 } 689 /* 690 * ia6t_expire and ia6t_preferred won't be used for now, 691 * so just in case. 692 */ 693 lt = &ifra->ifra_lifetime; 694 if (lt->ia6t_expire != 0) 695 lt->ia6t_expire = time_wall_to_mono(lt->ia6t_expire); 696 if (lt->ia6t_preferred != 0) 697 lt->ia6t_preferred = 698 time_wall_to_mono(lt->ia6t_preferred); 699 /* 700 * make (ia == NULL) or update (ia != NULL) the interface 701 * address structure, and link it to the list. 702 */ 703 int s = splsoftnet(); 704 error = in6_update_ifa1(ifp, ifra, &ia, &psref, 0); 705 splx(s); 706 if (error) 707 break; 708 pfil_run_addrhooks(if_pfil, cmd, &ia->ia_ifa); 709 break; 710 } 711 712 case SIOCDIFADDR_IN6: 713 ia6_release(ia, &psref); 714 ifaref(&ia->ia_ifa); 715 in6_purgeaddr(&ia->ia_ifa); 716 pfil_run_addrhooks(if_pfil, cmd, &ia->ia_ifa); 717 ifafree(&ia->ia_ifa); 718 ia = NULL; 719 break; 720 721 default: 722 error = ENOTTY; 723 } 724 release: 725 ia6_release(ia, &psref); 726 out: 727 curlwp_bindx(bound); 728 return error; 729 } 730 731 int 732 in6_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp) 733 { 734 int error, s; 735 736 switch (cmd) { 737 #ifdef OSIOCSIFINFO_IN6_90 738 case OSIOCSIFINFO_FLAGS_90: 739 case OSIOCSIFINFO_IN6_90: 740 case OSIOCSDEFIFACE_IN6: 741 case OSIOCSNDFLUSH_IN6: 742 case OSIOCSPFXFLUSH_IN6: 743 case OSIOCSRTRFLUSH_IN6: 744 #endif 745 case SIOCSIFINFO_FLAGS: 746 case SIOCSIFINFO_IN6: 747 748 case SIOCALIFADDR: 749 case SIOCDLIFADDR: 750 751 case SIOCDIFADDR_IN6: 752 #ifdef OSIOCAIFADDR_IN6 753 case OSIOCAIFADDR_IN6: 754 #endif 755 case SIOCAIFADDR_IN6: 756 757 case SIOCAADDRCTL_POLICY: 758 case SIOCDADDRCTL_POLICY: 759 760 if (kauth_authorize_network(curlwp->l_cred, 761 KAUTH_NETWORK_SOCKET, 762 KAUTH_REQ_NETWORK_SOCKET_SETPRIV, 763 so, NULL, NULL)) 764 return EPERM; 765 break; 766 } 767 768 s = splsoftnet(); 769 #ifndef NET_MPSAFE 770 KASSERT(KERNEL_LOCKED_P()); 771 #endif 772 error = in6_control1(so , cmd, data, ifp); 773 splx(s); 774 return error; 775 } 776 777 static int 778 in6_get_llsol_addr(struct in6_addr *llsol, struct ifnet *ifp, 779 struct in6_addr *ip6) 780 { 781 int error; 782 783 memset(llsol, 0, sizeof(struct in6_addr)); 784 llsol->s6_addr16[0] = htons(0xff02); 785 llsol->s6_addr32[1] = 0; 786 llsol->s6_addr32[2] = htonl(1); 787 llsol->s6_addr32[3] = ip6->s6_addr32[3]; 788 llsol->s6_addr8[12] = 0xff; 789 790 error = in6_setscope(llsol, ifp, NULL); 791 if (error != 0) { 792 /* XXX: should not happen */ 793 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 794 } 795 796 return error; 797 } 798 799 static int 800 in6_join_mcastgroups(struct in6_aliasreq *ifra, struct in6_ifaddr *ia, 801 struct ifnet *ifp, int flags) 802 { 803 int error; 804 struct sockaddr_in6 mltaddr, mltmask; 805 struct in6_multi_mship *imm; 806 struct in6_addr llsol; 807 struct rtentry *rt; 808 int dad_delay; 809 char ip6buf[INET6_ADDRSTRLEN]; 810 811 /* join solicited multicast addr for new host id */ 812 error = in6_get_llsol_addr(&llsol, ifp, &ifra->ifra_addr.sin6_addr); 813 if (error != 0) 814 goto out; 815 dad_delay = 0; 816 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 817 /* 818 * We need a random delay for DAD on the address 819 * being configured. It also means delaying 820 * transmission of the corresponding MLD report to 821 * avoid report collision. 822 * [draft-ietf-ipv6-rfc2462bis-02.txt] 823 */ 824 dad_delay = cprng_fast32() % (MAX_RTR_SOLICITATION_DELAY * hz); 825 } 826 827 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */ 828 /* join solicited multicast addr for new host id */ 829 imm = in6_joingroup(ifp, &llsol, &error, dad_delay); 830 if (!imm) { 831 nd6log(LOG_ERR, 832 "addmulti failed for %s on %s (errno=%d)\n", 833 IN6_PRINT(ip6buf, &llsol), if_name(ifp), error); 834 goto out; 835 } 836 mutex_enter(&in6_ifaddr_lock); 837 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 838 mutex_exit(&in6_ifaddr_lock); 839 840 sockaddr_in6_init(&mltmask, &in6mask32, 0, 0, 0); 841 842 /* 843 * join link-local all-nodes address 844 */ 845 sockaddr_in6_init(&mltaddr, &in6addr_linklocal_allnodes, 846 0, 0, 0); 847 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 848 goto out; /* XXX: should not fail */ 849 850 /* 851 * XXX: do we really need this automatic routes? 852 * We should probably reconsider this stuff. Most applications 853 * actually do not need the routes, since they usually specify 854 * the outgoing interface. 855 */ 856 rt = rtalloc1(sin6tosa(&mltaddr), 0); 857 if (rt) { 858 if (memcmp(&mltaddr.sin6_addr, 859 &satocsin6(rt_getkey(rt))->sin6_addr, 860 MLTMASK_LEN)) { 861 rt_unref(rt); 862 rt = NULL; 863 } else if (rt->rt_ifp != ifp) { 864 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 865 "network %04x:%04x::/32 = %04x:%04x::/32\n", 866 __func__, rt->rt_ifp, ifp, ifp->if_xname, 867 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 868 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 869 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 870 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 871 #ifdef NET_MPSAFE 872 error = rt_update_prepare(rt); 873 if (error == 0) { 874 rt_replace_ifa(rt, &ia->ia_ifa); 875 rt->rt_ifp = ifp; 876 rt_update_finish(rt); 877 } else { 878 /* 879 * If error != 0, the rtentry is being 880 * destroyed, so doing nothing doesn't 881 * matter. 882 */ 883 } 884 #else 885 rt_replace_ifa(rt, &ia->ia_ifa); 886 rt->rt_ifp = ifp; 887 #endif 888 } 889 } 890 if (!rt) { 891 struct rt_addrinfo info; 892 893 memset(&info, 0, sizeof(info)); 894 info.rti_info[RTAX_DST] = sin6tosa(&mltaddr); 895 info.rti_info[RTAX_GATEWAY] = sin6tosa(&ia->ia_addr); 896 info.rti_info[RTAX_NETMASK] = sin6tosa(&mltmask); 897 info.rti_info[RTAX_IFA] = sin6tosa(&ia->ia_addr); 898 /* XXX: we need RTF_CONNECTED to fake nd6_rtrequest */ 899 info.rti_flags = RTF_UP | RTF_CONNECTED; 900 error = rtrequest1(RTM_ADD, &info, NULL); 901 if (error) 902 goto out; 903 } else { 904 rt_unref(rt); 905 } 906 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 907 if (!imm) { 908 nd6log(LOG_WARNING, 909 "addmulti failed for %s on %s (errno=%d)\n", 910 IN6_PRINT(ip6buf, &mltaddr.sin6_addr), 911 if_name(ifp), error); 912 goto out; 913 } 914 mutex_enter(&in6_ifaddr_lock); 915 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 916 mutex_exit(&in6_ifaddr_lock); 917 918 /* 919 * join node information group address 920 */ 921 dad_delay = 0; 922 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 923 /* 924 * The spec doesn't say anything about delay for this 925 * group, but the same logic should apply. 926 */ 927 dad_delay = cprng_fast32() % (MAX_RTR_SOLICITATION_DELAY * hz); 928 } 929 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr) != 0) 930 ; 931 else if ((imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 932 dad_delay)) == NULL) { /* XXX jinmei */ 933 nd6log(LOG_WARNING, 934 "addmulti failed for %s on %s (errno=%d)\n", 935 IN6_PRINT(ip6buf, &mltaddr.sin6_addr), 936 if_name(ifp), error); 937 /* XXX not very fatal, go on... */ 938 } else { 939 mutex_enter(&in6_ifaddr_lock); 940 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 941 mutex_exit(&in6_ifaddr_lock); 942 } 943 944 945 /* 946 * join interface-local all-nodes address. 947 * (ff01::1%ifN, and ff01::%ifN/32) 948 */ 949 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 950 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 951 goto out; /* XXX: should not fail */ 952 953 /* XXX: again, do we really need the route? */ 954 rt = rtalloc1(sin6tosa(&mltaddr), 0); 955 if (rt) { 956 /* 32bit came from "mltmask" */ 957 if (memcmp(&mltaddr.sin6_addr, 958 &satocsin6(rt_getkey(rt))->sin6_addr, 959 32 / NBBY)) { 960 rt_unref(rt); 961 rt = NULL; 962 } else if (rt->rt_ifp != ifp) { 963 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 964 "network %04x:%04x::/32 = %04x:%04x::/32\n", 965 __func__, rt->rt_ifp, ifp, ifp->if_xname, 966 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 967 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 968 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 969 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 970 #ifdef NET_MPSAFE 971 error = rt_update_prepare(rt); 972 if (error == 0) { 973 rt_replace_ifa(rt, &ia->ia_ifa); 974 rt->rt_ifp = ifp; 975 rt_update_finish(rt); 976 } else { 977 /* 978 * If error != 0, the rtentry is being 979 * destroyed, so doing nothing doesn't 980 * matter. 981 */ 982 } 983 #else 984 rt_replace_ifa(rt, &ia->ia_ifa); 985 rt->rt_ifp = ifp; 986 #endif 987 } 988 } 989 if (!rt) { 990 struct rt_addrinfo info; 991 992 memset(&info, 0, sizeof(info)); 993 info.rti_info[RTAX_DST] = sin6tosa(&mltaddr); 994 info.rti_info[RTAX_GATEWAY] = sin6tosa(&ia->ia_addr); 995 info.rti_info[RTAX_NETMASK] = sin6tosa(&mltmask); 996 info.rti_info[RTAX_IFA] = sin6tosa(&ia->ia_addr); 997 info.rti_flags = RTF_UP | RTF_CONNECTED; 998 error = rtrequest1(RTM_ADD, &info, NULL); 999 if (error) 1000 goto out; 1001 #undef MLTMASK_LEN 1002 } else { 1003 rt_unref(rt); 1004 } 1005 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1006 if (!imm) { 1007 nd6log(LOG_WARNING, 1008 "addmulti failed for %s on %s (errno=%d)\n", 1009 IN6_PRINT(ip6buf, &mltaddr.sin6_addr), 1010 if_name(ifp), error); 1011 goto out; 1012 } else { 1013 mutex_enter(&in6_ifaddr_lock); 1014 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1015 mutex_exit(&in6_ifaddr_lock); 1016 } 1017 return 0; 1018 1019 out: 1020 KASSERT(error != 0); 1021 return error; 1022 } 1023 1024 /* 1025 * Update parameters of an IPv6 interface address. 1026 * If necessary, a new entry is created and linked into address chains. 1027 * This function is separated from in6_control(). 1028 * XXX: should this be performed under splsoftnet()? 1029 */ 1030 static int 1031 in6_update_ifa1(struct ifnet *ifp, struct in6_aliasreq *ifra, 1032 struct in6_ifaddr **iap, struct psref *psref, int flags) 1033 { 1034 int error = 0, hostIsNew = 0, plen = -1; 1035 struct sockaddr_in6 dst6; 1036 struct in6_addrlifetime *lt; 1037 int dad_delay, was_tentative; 1038 struct in6_ifaddr *ia = iap ? *iap : NULL; 1039 char ip6buf[INET6_ADDRSTRLEN]; 1040 1041 KASSERT((iap == NULL && psref == NULL) || 1042 (iap != NULL && psref != NULL)); 1043 1044 /* Validate parameters */ 1045 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 1046 return EINVAL; 1047 1048 /* 1049 * The destination address for a p2p link must have a family 1050 * of AF_UNSPEC or AF_INET6. 1051 */ 1052 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 1053 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 1054 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 1055 return EAFNOSUPPORT; 1056 /* 1057 * validate ifra_prefixmask. don't check sin6_family, netmask 1058 * does not carry fields other than sin6_len. 1059 */ 1060 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 1061 return EINVAL; 1062 /* 1063 * Because the IPv6 address architecture is classless, we require 1064 * users to specify a (non 0) prefix length (mask) for a new address. 1065 * We also require the prefix (when specified) mask is valid, and thus 1066 * reject a non-consecutive mask. 1067 */ 1068 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 1069 return EINVAL; 1070 if (ifra->ifra_prefixmask.sin6_len != 0) { 1071 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 1072 (u_char *)&ifra->ifra_prefixmask + 1073 ifra->ifra_prefixmask.sin6_len); 1074 if (plen <= 0) 1075 return EINVAL; 1076 } else { 1077 /* 1078 * In this case, ia must not be NULL. We just use its prefix 1079 * length. 1080 */ 1081 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1082 } 1083 /* 1084 * If the destination address on a p2p interface is specified, 1085 * and the address is a scoped one, validate/set the scope 1086 * zone identifier. 1087 */ 1088 dst6 = ifra->ifra_dstaddr; 1089 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 1090 (dst6.sin6_family == AF_INET6)) { 1091 struct in6_addr in6_tmp; 1092 u_int32_t zoneid; 1093 1094 in6_tmp = dst6.sin6_addr; 1095 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 1096 return EINVAL; /* XXX: should be impossible */ 1097 1098 if (dst6.sin6_scope_id != 0) { 1099 if (dst6.sin6_scope_id != zoneid) 1100 return EINVAL; 1101 } else /* user omit to specify the ID. */ 1102 dst6.sin6_scope_id = zoneid; 1103 1104 /* convert into the internal form */ 1105 if (sa6_embedscope(&dst6, 0)) 1106 return EINVAL; /* XXX: should be impossible */ 1107 } 1108 /* 1109 * The destination address can be specified only for a p2p or a 1110 * loopback interface. If specified, the corresponding prefix length 1111 * must be 128. 1112 */ 1113 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 1114 #ifdef FORCE_P2PPLEN 1115 int i; 1116 #endif 1117 1118 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 1119 /* XXX: noisy message */ 1120 nd6log(LOG_INFO, "a destination can " 1121 "be specified for a p2p or a loopback IF only\n"); 1122 return EINVAL; 1123 } 1124 if (plen != 128) { 1125 nd6log(LOG_INFO, "prefixlen should " 1126 "be 128 when dstaddr is specified\n"); 1127 #ifdef FORCE_P2PPLEN 1128 /* 1129 * To be compatible with old configurations, 1130 * such as ifconfig gif0 inet6 2001::1 2001::2 1131 * prefixlen 126, we override the specified 1132 * prefixmask as if the prefix length was 128. 1133 */ 1134 ifra->ifra_prefixmask.sin6_len = 1135 sizeof(struct sockaddr_in6); 1136 for (i = 0; i < 4; i++) 1137 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i] = 1138 0xffffffff; 1139 plen = 128; 1140 #else 1141 return EINVAL; 1142 #endif 1143 } 1144 } 1145 /* lifetime consistency check */ 1146 lt = &ifra->ifra_lifetime; 1147 if (lt->ia6t_pltime > lt->ia6t_vltime) 1148 return EINVAL; 1149 if (lt->ia6t_vltime == 0) { 1150 /* 1151 * the following log might be noisy, but this is a typical 1152 * configuration mistake or a tool's bug. 1153 */ 1154 nd6log(LOG_INFO, "valid lifetime is 0 for %s\n", 1155 IN6_PRINT(ip6buf, &ifra->ifra_addr.sin6_addr)); 1156 1157 if (ia == NULL) 1158 return 0; /* there's nothing to do */ 1159 } 1160 1161 /* 1162 * If this is a new address, allocate a new ifaddr and link it 1163 * into chains. 1164 */ 1165 if (ia == NULL) { 1166 hostIsNew = 1; 1167 /* 1168 * When in6_update_ifa() is called in a process of a received 1169 * RA, it is called under an interrupt context. So, we should 1170 * call malloc with M_NOWAIT. 1171 */ 1172 ia = malloc(sizeof(*ia), M_IFADDR, M_NOWAIT|M_ZERO); 1173 if (ia == NULL) 1174 return ENOBUFS; 1175 LIST_INIT(&ia->ia6_memberships); 1176 /* Initialize the address and masks, and put time stamp */ 1177 ia->ia_ifa.ifa_addr = sin6tosa(&ia->ia_addr); 1178 ia->ia_addr.sin6_family = AF_INET6; 1179 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 1180 ia->ia6_createtime = time_uptime; 1181 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1182 /* 1183 * XXX: some functions expect that ifa_dstaddr is not 1184 * NULL for p2p interfaces. 1185 */ 1186 ia->ia_ifa.ifa_dstaddr = sin6tosa(&ia->ia_dstaddr); 1187 } else { 1188 ia->ia_ifa.ifa_dstaddr = NULL; 1189 } 1190 ia->ia_ifa.ifa_netmask = sin6tosa(&ia->ia_prefixmask); 1191 1192 ia->ia_ifp = ifp; 1193 IN6_ADDRLIST_ENTRY_INIT(ia); 1194 ifa_psref_init(&ia->ia_ifa); 1195 } 1196 1197 /* update timestamp */ 1198 ia->ia6_updatetime = time_uptime; 1199 1200 /* set prefix mask */ 1201 if (ifra->ifra_prefixmask.sin6_len) { 1202 if (ia->ia_prefixmask.sin6_len) { 1203 if (!IN6_ARE_ADDR_EQUAL(&ia->ia_prefixmask.sin6_addr, 1204 &ifra->ifra_prefixmask.sin6_addr)) 1205 in6_ifremprefix(ia); 1206 } 1207 ia->ia_prefixmask = ifra->ifra_prefixmask; 1208 } 1209 1210 /* Set destination address. */ 1211 if (dst6.sin6_family == AF_INET6) { 1212 if (!IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, 1213 &ia->ia_dstaddr.sin6_addr)) 1214 in6_ifremprefix(ia); 1215 ia->ia_dstaddr = dst6; 1216 } 1217 1218 /* 1219 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1220 * to see if the address is deprecated or invalidated, but initialize 1221 * these members for applications. 1222 */ 1223 ia->ia6_lifetime = ifra->ifra_lifetime; 1224 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1225 ia->ia6_lifetime.ia6t_expire = 1226 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1227 } else 1228 ia->ia6_lifetime.ia6t_expire = 0; 1229 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1230 ia->ia6_lifetime.ia6t_preferred = 1231 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1232 } else 1233 ia->ia6_lifetime.ia6t_preferred = 0; 1234 1235 /* 1236 * configure address flags. 1237 * We need to preserve tentative state so DAD works if 1238 * something adds the same address before DAD finishes. 1239 */ 1240 was_tentative = ia->ia6_flags & (IN6_IFF_TENTATIVE|IN6_IFF_DUPLICATED); 1241 ia->ia6_flags = ifra->ifra_flags; 1242 1243 /* 1244 * Make the address tentative before joining multicast addresses, 1245 * so that corresponding MLD responses would not have a tentative 1246 * source address. 1247 */ 1248 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1249 if (ifp->if_link_state == LINK_STATE_DOWN) { 1250 ia->ia6_flags |= IN6_IFF_DETACHED; 1251 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1252 } else if ((hostIsNew || was_tentative) && if_do_dad(ifp) && 1253 ip6_dad_enabled()) { 1254 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1255 } 1256 1257 /* 1258 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1259 * userland, make it deprecated. 1260 */ 1261 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1262 ia->ia6_lifetime.ia6t_pltime = 0; 1263 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1264 } 1265 1266 if (hostIsNew) { 1267 /* 1268 * We need a reference to ia before calling in6_ifinit. 1269 * Otherwise ia can be freed in in6_ifinit accidentally. 1270 */ 1271 ifaref(&ia->ia_ifa); 1272 } 1273 1274 /* Must execute in6_ifinit and ifa_insert atomically */ 1275 mutex_enter(&in6_ifaddr_lock); 1276 1277 /* reset the interface and routing table appropriately. */ 1278 error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew); 1279 if (error != 0) { 1280 if (hostIsNew) 1281 free(ia, M_IFADDR); 1282 mutex_exit(&in6_ifaddr_lock); 1283 return error; 1284 } 1285 1286 /* 1287 * We are done if we have simply modified an existing address. 1288 */ 1289 if (!hostIsNew) { 1290 mutex_exit(&in6_ifaddr_lock); 1291 return error; 1292 } 1293 1294 /* 1295 * Insert ia to the global list and ifa to the interface's list. 1296 * A reference to it is already gained above. 1297 */ 1298 IN6_ADDRLIST_WRITER_INSERT_TAIL(ia); 1299 ifa_insert(ifp, &ia->ia_ifa); 1300 1301 mutex_exit(&in6_ifaddr_lock); 1302 1303 /* 1304 * Beyond this point, we should call in6_purgeaddr upon an error, 1305 * not just go to unlink. 1306 */ 1307 1308 /* join necessary multicast groups */ 1309 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1310 error = in6_join_mcastgroups(ifra, ia, ifp, flags); 1311 if (error != 0) 1312 goto cleanup; 1313 } 1314 1315 if (nd6_need_cache(ifp)) { 1316 /* XXX maybe unnecessary */ 1317 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1318 ia->ia_ifa.ifa_flags |= RTF_CONNECTED; 1319 } 1320 1321 /* 1322 * Perform DAD, if needed. 1323 * XXX It may be of use, if we can administratively 1324 * disable DAD. 1325 */ 1326 if (hostIsNew && if_do_dad(ifp) && 1327 ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && 1328 (ia->ia6_flags & IN6_IFF_TENTATIVE)) 1329 { 1330 int mindelay, maxdelay; 1331 1332 dad_delay = 0; 1333 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1334 struct in6_addr llsol; 1335 struct in6_multi *in6m_sol = NULL; 1336 /* 1337 * We need to impose a delay before sending an NS 1338 * for DAD. Check if we also needed a delay for the 1339 * corresponding MLD message. If we did, the delay 1340 * should be larger than the MLD delay (this could be 1341 * relaxed a bit, but this simple logic is at least 1342 * safe). 1343 */ 1344 mindelay = 0; 1345 error = in6_get_llsol_addr(&llsol, ifp, 1346 &ifra->ifra_addr.sin6_addr); 1347 in6_multi_lock(RW_READER); 1348 if (error == 0) 1349 in6m_sol = in6_lookup_multi(&llsol, ifp); 1350 if (in6m_sol != NULL && 1351 in6m_sol->in6m_state == MLD_REPORTPENDING) { 1352 mindelay = in6m_sol->in6m_timer; 1353 } 1354 in6_multi_unlock(); 1355 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1356 if (maxdelay - mindelay == 0) 1357 dad_delay = 0; 1358 else { 1359 dad_delay = 1360 (cprng_fast32() % (maxdelay - mindelay)) + 1361 mindelay; 1362 } 1363 } 1364 /* +1 ensures callout is always used */ 1365 nd6_dad_start(&ia->ia_ifa, dad_delay + 1); 1366 } 1367 1368 if (iap != NULL) { 1369 *iap = ia; 1370 if (hostIsNew) 1371 ia6_acquire(ia, psref); 1372 } 1373 1374 return 0; 1375 1376 cleanup: 1377 in6_purgeaddr(&ia->ia_ifa); 1378 return error; 1379 } 1380 1381 int 1382 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags) 1383 { 1384 int rc, s; 1385 1386 s = splsoftnet(); 1387 rc = in6_update_ifa1(ifp, ifra, NULL, NULL, flags); 1388 splx(s); 1389 return rc; 1390 } 1391 1392 void 1393 in6_purgeaddr(struct ifaddr *ifa) 1394 { 1395 struct ifnet *ifp = ifa->ifa_ifp; 1396 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1397 struct in6_multi_mship *imm; 1398 1399 /* KASSERT(!ifa_held(ifa)); XXX need ifa_not_held (psref_not_held) */ 1400 KASSERT(IFNET_LOCKED(ifp)); 1401 1402 ifa->ifa_flags |= IFA_DESTROYING; 1403 1404 /* stop DAD processing */ 1405 nd6_dad_stop(ifa); 1406 1407 /* Delete any network route. */ 1408 in6_ifremprefix(ia); 1409 1410 /* Remove ownaddr's loopback rtentry, if it exists. */ 1411 in6_ifremlocal(&(ia->ia_ifa)); 1412 1413 /* 1414 * leave from multicast groups we have joined for the interface 1415 */ 1416 again: 1417 mutex_enter(&in6_ifaddr_lock); 1418 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1419 struct in6_multi *in6m __diagused = imm->i6mm_maddr; 1420 KASSERTMSG(in6m == NULL || in6m->in6m_ifp == ifp, 1421 "in6m_ifp=%s ifp=%s", in6m ? in6m->in6m_ifp->if_xname : NULL, 1422 ifp->if_xname); 1423 LIST_REMOVE(imm, i6mm_chain); 1424 mutex_exit(&in6_ifaddr_lock); 1425 1426 in6_leavegroup(imm); 1427 goto again; 1428 } 1429 mutex_exit(&in6_ifaddr_lock); 1430 1431 in6_unlink_ifa(ia, ifp); 1432 } 1433 1434 static void 1435 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1436 { 1437 int s = splsoftnet(); 1438 1439 mutex_enter(&in6_ifaddr_lock); 1440 IN6_ADDRLIST_WRITER_REMOVE(ia); 1441 ifa_remove(ifp, &ia->ia_ifa); 1442 /* Assume ifa_remove called pserialize_perform and psref_destroy */ 1443 mutex_exit(&in6_ifaddr_lock); 1444 IN6_ADDRLIST_ENTRY_DESTROY(ia); 1445 1446 /* 1447 * release another refcnt for the link from in6_ifaddr. 1448 * Note that we should decrement the refcnt at least once for all *BSD. 1449 */ 1450 ifafree(&ia->ia_ifa); 1451 1452 splx(s); 1453 } 1454 1455 void 1456 in6_purgeif(struct ifnet *ifp) 1457 { 1458 1459 IFNET_LOCK(ifp); 1460 in6_ifdetach(ifp); 1461 IFNET_UNLOCK(ifp); 1462 } 1463 1464 void 1465 in6_purge_mcast_references(struct in6_multi *in6m) 1466 { 1467 struct in6_ifaddr *ia; 1468 1469 KASSERT(in6_multi_locked(RW_WRITER)); 1470 1471 mutex_enter(&in6_ifaddr_lock); 1472 IN6_ADDRLIST_WRITER_FOREACH(ia) { 1473 struct in6_multi_mship *imm; 1474 LIST_FOREACH(imm, &ia->ia6_memberships, i6mm_chain) { 1475 if (imm->i6mm_maddr == in6m) 1476 imm->i6mm_maddr = NULL; 1477 } 1478 } 1479 mutex_exit(&in6_ifaddr_lock); 1480 } 1481 1482 /* 1483 * SIOC[GAD]LIFADDR. 1484 * SIOCGLIFADDR: get first address. (?) 1485 * SIOCGLIFADDR with IFLR_PREFIX: 1486 * get first address that matches the specified prefix. 1487 * SIOCALIFADDR: add the specified address. 1488 * SIOCALIFADDR with IFLR_PREFIX: 1489 * add the specified prefix, filling hostid part from 1490 * the first link-local address. prefixlen must be <= 64. 1491 * SIOCDLIFADDR: delete the specified address. 1492 * SIOCDLIFADDR with IFLR_PREFIX: 1493 * delete the first address that matches the specified prefix. 1494 * return values: 1495 * EINVAL on invalid parameters 1496 * EADDRNOTAVAIL on prefix match failed/specified address not found 1497 * other values may be returned from in6_ioctl() 1498 * 1499 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1500 * this is to accommodate address naming scheme other than RFC2374, 1501 * in the future. 1502 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1503 * address encoding scheme. (see figure on page 8) 1504 */ 1505 static int 1506 in6_lifaddr_ioctl(struct socket *so, u_long cmd, void *data, 1507 struct ifnet *ifp) 1508 { 1509 struct in6_ifaddr *ia = NULL; /* XXX gcc 4.8 maybe-uninitialized */ 1510 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1511 struct ifaddr *ifa; 1512 struct sockaddr *sa; 1513 1514 /* sanity checks */ 1515 if (!data || !ifp) { 1516 panic("invalid argument to in6_lifaddr_ioctl"); 1517 /* NOTREACHED */ 1518 } 1519 1520 switch (cmd) { 1521 case SIOCGLIFADDR: 1522 /* address must be specified on GET with IFLR_PREFIX */ 1523 if ((iflr->flags & IFLR_PREFIX) == 0) 1524 break; 1525 /* FALLTHROUGH */ 1526 case SIOCALIFADDR: 1527 case SIOCDLIFADDR: 1528 /* address must be specified on ADD and DELETE */ 1529 sa = (struct sockaddr *)&iflr->addr; 1530 if (sa->sa_family != AF_INET6) 1531 return EINVAL; 1532 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1533 return EINVAL; 1534 /* XXX need improvement */ 1535 sa = (struct sockaddr *)&iflr->dstaddr; 1536 if (sa->sa_family && sa->sa_family != AF_INET6) 1537 return EINVAL; 1538 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1539 return EINVAL; 1540 break; 1541 default: /* shouldn't happen */ 1542 #if 0 1543 panic("invalid cmd to in6_lifaddr_ioctl"); 1544 /* NOTREACHED */ 1545 #else 1546 return EOPNOTSUPP; 1547 #endif 1548 } 1549 if (sizeof(struct in6_addr) * NBBY < iflr->prefixlen) 1550 return EINVAL; 1551 1552 switch (cmd) { 1553 case SIOCALIFADDR: 1554 { 1555 struct in6_aliasreq ifra; 1556 struct in6_addr *xhostid = NULL; 1557 int prefixlen; 1558 int bound = curlwp_bind(); 1559 struct psref psref; 1560 1561 if ((iflr->flags & IFLR_PREFIX) != 0) { 1562 struct sockaddr_in6 *sin6; 1563 1564 /* 1565 * xhostid is to fill in the hostid part of the 1566 * address. xhostid points to the first link-local 1567 * address attached to the interface. 1568 */ 1569 ia = in6ifa_ifpforlinklocal_psref(ifp, 0, &psref); 1570 if (ia == NULL) { 1571 curlwp_bindx(bound); 1572 return EADDRNOTAVAIL; 1573 } 1574 xhostid = IFA_IN6(&ia->ia_ifa); 1575 1576 /* prefixlen must be <= 64. */ 1577 if (64 < iflr->prefixlen) { 1578 ia6_release(ia, &psref); 1579 curlwp_bindx(bound); 1580 return EINVAL; 1581 } 1582 prefixlen = iflr->prefixlen; 1583 1584 /* hostid part must be zero. */ 1585 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1586 if (sin6->sin6_addr.s6_addr32[2] != 0 1587 || sin6->sin6_addr.s6_addr32[3] != 0) { 1588 ia6_release(ia, &psref); 1589 curlwp_bindx(bound); 1590 return EINVAL; 1591 } 1592 } else 1593 prefixlen = iflr->prefixlen; 1594 1595 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1596 memset(&ifra, 0, sizeof(ifra)); 1597 memcpy(ifra.ifra_name, iflr->iflr_name, sizeof(ifra.ifra_name)); 1598 1599 memcpy(&ifra.ifra_addr, &iflr->addr, 1600 ((struct sockaddr *)&iflr->addr)->sa_len); 1601 if (xhostid) { 1602 /* fill in hostid part */ 1603 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1604 xhostid->s6_addr32[2]; 1605 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1606 xhostid->s6_addr32[3]; 1607 } 1608 1609 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1610 memcpy(&ifra.ifra_dstaddr, &iflr->dstaddr, 1611 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1612 if (xhostid) { 1613 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1614 xhostid->s6_addr32[2]; 1615 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1616 xhostid->s6_addr32[3]; 1617 } 1618 } 1619 if (xhostid) { 1620 ia6_release(ia, &psref); 1621 ia = NULL; 1622 } 1623 curlwp_bindx(bound); 1624 1625 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1626 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1627 1628 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 1629 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 1630 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1631 return in6_control(so, SIOCAIFADDR_IN6, &ifra, ifp); 1632 } 1633 case SIOCGLIFADDR: 1634 case SIOCDLIFADDR: 1635 { 1636 struct in6_addr mask, candidate, match; 1637 struct sockaddr_in6 *sin6; 1638 int cmp; 1639 int error, s; 1640 1641 memset(&mask, 0, sizeof(mask)); 1642 if (iflr->flags & IFLR_PREFIX) { 1643 /* lookup a prefix rather than address. */ 1644 in6_prefixlen2mask(&mask, iflr->prefixlen); 1645 1646 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1647 memcpy(&match, &sin6->sin6_addr, sizeof(match)); 1648 match.s6_addr32[0] &= mask.s6_addr32[0]; 1649 match.s6_addr32[1] &= mask.s6_addr32[1]; 1650 match.s6_addr32[2] &= mask.s6_addr32[2]; 1651 match.s6_addr32[3] &= mask.s6_addr32[3]; 1652 1653 /* if you set extra bits, that's wrong */ 1654 if (memcmp(&match, &sin6->sin6_addr, sizeof(match))) 1655 return EINVAL; 1656 1657 cmp = 1; 1658 } else { 1659 if (cmd == SIOCGLIFADDR) { 1660 /* on getting an address, take the 1st match */ 1661 cmp = 0; /* XXX */ 1662 } else { 1663 /* on deleting an address, do exact match */ 1664 in6_prefixlen2mask(&mask, 128); 1665 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1666 memcpy(&match, &sin6->sin6_addr, sizeof(match)); 1667 1668 cmp = 1; 1669 } 1670 } 1671 1672 s = pserialize_read_enter(); 1673 IFADDR_READER_FOREACH(ifa, ifp) { 1674 if (ifa->ifa_addr->sa_family != AF_INET6) 1675 continue; 1676 if (!cmp) 1677 break; 1678 1679 /* 1680 * XXX: this is adhoc, but is necessary to allow 1681 * a user to specify fe80::/64 (not /10) for a 1682 * link-local address. 1683 */ 1684 memcpy(&candidate, IFA_IN6(ifa), sizeof(candidate)); 1685 in6_clearscope(&candidate); 1686 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1687 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1688 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1689 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1690 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1691 break; 1692 } 1693 if (!ifa) { 1694 error = EADDRNOTAVAIL; 1695 goto error; 1696 } 1697 ia = ifa2ia6(ifa); 1698 1699 if (cmd == SIOCGLIFADDR) { 1700 /* fill in the if_laddrreq structure */ 1701 memcpy(&iflr->addr, &ia->ia_addr, ia->ia_addr.sin6_len); 1702 error = sa6_recoverscope( 1703 (struct sockaddr_in6 *)&iflr->addr); 1704 if (error != 0) 1705 goto error; 1706 1707 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1708 memcpy(&iflr->dstaddr, &ia->ia_dstaddr, 1709 ia->ia_dstaddr.sin6_len); 1710 error = sa6_recoverscope( 1711 (struct sockaddr_in6 *)&iflr->dstaddr); 1712 if (error != 0) 1713 goto error; 1714 } else 1715 memset(&iflr->dstaddr, 0, sizeof(iflr->dstaddr)); 1716 1717 iflr->prefixlen = 1718 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1719 1720 iflr->flags = ia->ia6_flags; /* XXX */ 1721 1722 error = 0; 1723 } else { 1724 struct in6_aliasreq ifra; 1725 1726 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1727 memset(&ifra, 0, sizeof(ifra)); 1728 memcpy(ifra.ifra_name, iflr->iflr_name, 1729 sizeof(ifra.ifra_name)); 1730 1731 memcpy(&ifra.ifra_addr, &ia->ia_addr, 1732 ia->ia_addr.sin6_len); 1733 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1734 memcpy(&ifra.ifra_dstaddr, &ia->ia_dstaddr, 1735 ia->ia_dstaddr.sin6_len); 1736 } else { 1737 memset(&ifra.ifra_dstaddr, 0, 1738 sizeof(ifra.ifra_dstaddr)); 1739 } 1740 memcpy(&ifra.ifra_dstaddr, &ia->ia_prefixmask, 1741 ia->ia_prefixmask.sin6_len); 1742 1743 ifra.ifra_flags = ia->ia6_flags; 1744 pserialize_read_exit(s); 1745 1746 return in6_control(so, SIOCDIFADDR_IN6, &ifra, ifp); 1747 } 1748 error: 1749 pserialize_read_exit(s); 1750 return error; 1751 } 1752 } 1753 1754 return EOPNOTSUPP; /* just for safety */ 1755 } 1756 1757 /* 1758 * Initialize an interface's internet6 address 1759 * and routing table entry. 1760 */ 1761 static int 1762 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1763 const struct sockaddr_in6 *sin6, int newhost) 1764 { 1765 int error = 0, ifacount = 0; 1766 int s; 1767 struct ifaddr *ifa; 1768 1769 KASSERT(mutex_owned(&in6_ifaddr_lock)); 1770 1771 /* 1772 * Give the interface a chance to initialize 1773 * if this is its first address, 1774 * and to validate the address if necessary. 1775 */ 1776 s = pserialize_read_enter(); 1777 IFADDR_READER_FOREACH(ifa, ifp) { 1778 if (ifa->ifa_addr->sa_family != AF_INET6) 1779 continue; 1780 ifacount++; 1781 } 1782 pserialize_read_exit(s); 1783 1784 ia->ia_addr = *sin6; 1785 1786 if (ifacount == 0 && 1787 (error = if_addr_init(ifp, &ia->ia_ifa, true)) != 0) { 1788 return error; 1789 } 1790 1791 ia->ia_ifa.ifa_metric = ifp->if_metric; 1792 1793 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1794 1795 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1796 if (newhost) { 1797 /* set the rtrequest function to create llinfo */ 1798 if (ifp->if_flags & IFF_POINTOPOINT) 1799 ia->ia_ifa.ifa_rtrequest = p2p_rtrequest; 1800 else if ((ifp->if_flags & IFF_LOOPBACK) == 0) 1801 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1802 in6_ifaddlocal(&ia->ia_ifa); 1803 } else { 1804 /* Inform the routing socket of new flags/timings */ 1805 rt_addrmsg(RTM_NEWADDR, &ia->ia_ifa); 1806 } 1807 1808 /* Add the network prefix route. */ 1809 if ((error = in6_ifaddprefix(ia)) != 0) { 1810 if (newhost) 1811 in6_ifremlocal(&ia->ia_ifa); 1812 return error; 1813 } 1814 1815 return error; 1816 } 1817 1818 static struct ifaddr * 1819 bestifa(struct ifaddr *best_ifa, struct ifaddr *ifa) 1820 { 1821 if (best_ifa == NULL || best_ifa->ifa_preference < ifa->ifa_preference) 1822 return ifa; 1823 return best_ifa; 1824 } 1825 1826 /* 1827 * Find an IPv6 interface link-local address specific to an interface. 1828 */ 1829 struct in6_ifaddr * 1830 in6ifa_ifpforlinklocal(const struct ifnet *ifp, const int ignoreflags) 1831 { 1832 struct ifaddr *best_ifa = NULL, *ifa; 1833 1834 IFADDR_READER_FOREACH(ifa, ifp) { 1835 if (ifa->ifa_addr->sa_family != AF_INET6) 1836 continue; 1837 if (!IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) 1838 continue; 1839 if ((((struct in6_ifaddr *)ifa)->ia6_flags & ignoreflags) != 0) 1840 continue; 1841 best_ifa = bestifa(best_ifa, ifa); 1842 } 1843 1844 return (struct in6_ifaddr *)best_ifa; 1845 } 1846 1847 struct in6_ifaddr * 1848 in6ifa_ifpforlinklocal_psref(const struct ifnet *ifp, const int ignoreflags, 1849 struct psref *psref) 1850 { 1851 struct in6_ifaddr *ia; 1852 int s = pserialize_read_enter(); 1853 1854 ia = in6ifa_ifpforlinklocal(ifp, ignoreflags); 1855 if (ia != NULL) 1856 ia6_acquire(ia, psref); 1857 pserialize_read_exit(s); 1858 1859 return ia; 1860 } 1861 1862 /* 1863 * find the internet address corresponding to a given address. 1864 * ifaddr is returned referenced. 1865 */ 1866 struct in6_ifaddr * 1867 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid) 1868 { 1869 struct in6_ifaddr *ia; 1870 int s; 1871 1872 s = pserialize_read_enter(); 1873 IN6_ADDRLIST_READER_FOREACH(ia) { 1874 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1875 if (zoneid != 0 && 1876 zoneid != ia->ia_addr.sin6_scope_id) 1877 continue; 1878 ifaref(&ia->ia_ifa); 1879 break; 1880 } 1881 } 1882 pserialize_read_exit(s); 1883 1884 return ia; 1885 } 1886 1887 /* 1888 * find the internet address corresponding to a given interface and address. 1889 */ 1890 struct in6_ifaddr * 1891 in6ifa_ifpwithaddr(const struct ifnet *ifp, const struct in6_addr *addr) 1892 { 1893 struct ifaddr *best_ifa = NULL, *ifa; 1894 1895 IFADDR_READER_FOREACH(ifa, ifp) { 1896 if (ifa->ifa_addr->sa_family != AF_INET6) 1897 continue; 1898 if (!IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1899 continue; 1900 best_ifa = bestifa(best_ifa, ifa); 1901 } 1902 1903 return (struct in6_ifaddr *)best_ifa; 1904 } 1905 1906 struct in6_ifaddr * 1907 in6ifa_ifpwithaddr_psref(const struct ifnet *ifp, const struct in6_addr *addr, 1908 struct psref *psref) 1909 { 1910 struct in6_ifaddr *ia; 1911 int s = pserialize_read_enter(); 1912 1913 ia = in6ifa_ifpwithaddr(ifp, addr); 1914 if (ia != NULL) 1915 ia6_acquire(ia, psref); 1916 pserialize_read_exit(s); 1917 1918 return ia; 1919 } 1920 1921 static struct in6_ifaddr * 1922 bestia(struct in6_ifaddr *best_ia, struct in6_ifaddr *ia) 1923 { 1924 if (best_ia == NULL || 1925 best_ia->ia_ifa.ifa_preference < ia->ia_ifa.ifa_preference) 1926 return ia; 1927 return best_ia; 1928 } 1929 1930 /* 1931 * Determine if an address is on a local network. 1932 */ 1933 int 1934 in6_localaddr(const struct in6_addr *in6) 1935 { 1936 struct in6_ifaddr *ia; 1937 int s; 1938 1939 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1940 return 1; 1941 1942 s = pserialize_read_enter(); 1943 IN6_ADDRLIST_READER_FOREACH(ia) { 1944 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1945 &ia->ia_prefixmask.sin6_addr)) { 1946 pserialize_read_exit(s); 1947 return 1; 1948 } 1949 } 1950 pserialize_read_exit(s); 1951 1952 return 0; 1953 } 1954 1955 int 1956 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1957 { 1958 struct in6_ifaddr *ia; 1959 int s; 1960 1961 s = pserialize_read_enter(); 1962 IN6_ADDRLIST_READER_FOREACH(ia) { 1963 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1964 &sa6->sin6_addr) && 1965 #ifdef SCOPEDROUTING 1966 ia->ia_addr.sin6_scope_id == sa6->sin6_scope_id && 1967 #endif 1968 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) { 1969 pserialize_read_exit(s); 1970 return 1; /* true */ 1971 } 1972 1973 /* XXX: do we still have to go thru the rest of the list? */ 1974 } 1975 pserialize_read_exit(s); 1976 1977 return 0; /* false */ 1978 } 1979 1980 /* 1981 * return length of part which dst and src are equal 1982 * hard coding... 1983 */ 1984 int 1985 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1986 { 1987 int match = 0; 1988 u_char *s = (u_char *)src, *d = (u_char *)dst; 1989 u_char *lim = s + 16, r; 1990 1991 while (s < lim) 1992 if ((r = (*d++ ^ *s++)) != 0) { 1993 while (r < 128) { 1994 match++; 1995 r <<= 1; 1996 } 1997 break; 1998 } else 1999 match += NBBY; 2000 return match; 2001 } 2002 2003 void 2004 in6_prefixlen2mask(struct in6_addr *maskp, int len) 2005 { 2006 static const u_char maskarray[NBBY] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 2007 int bytelen, bitlen, i; 2008 2009 /* sanity check */ 2010 if (len < 0 || len > 128) { 2011 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 2012 len); 2013 return; 2014 } 2015 2016 memset(maskp, 0, sizeof(*maskp)); 2017 bytelen = len / NBBY; 2018 bitlen = len % NBBY; 2019 for (i = 0; i < bytelen; i++) 2020 maskp->s6_addr[i] = 0xff; 2021 if (bitlen) 2022 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 2023 } 2024 2025 /* 2026 * return the best address out of the same scope. if no address was 2027 * found, return the first valid address from designated IF. 2028 */ 2029 struct in6_ifaddr * 2030 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2031 { 2032 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2033 struct ifaddr *ifa; 2034 struct in6_ifaddr *best_ia = NULL, *ia; 2035 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2036 2037 dep[0] = dep[1] = NULL; 2038 2039 /* 2040 * We first look for addresses in the same scope. 2041 * If there is one, return it. 2042 * If two or more, return one which matches the dst longest. 2043 * If none, return one of global addresses assigned other ifs. 2044 */ 2045 IFADDR_READER_FOREACH(ifa, ifp) { 2046 if (ifa->ifa_addr->sa_family != AF_INET6) 2047 continue; 2048 ia = (struct in6_ifaddr *)ifa; 2049 if (ia->ia6_flags & IN6_IFF_ANYCAST) 2050 continue; /* XXX: is there any case to allow anycast? */ 2051 if (ia->ia6_flags & IN6_IFF_NOTREADY) 2052 continue; /* don't use this interface */ 2053 if (ia->ia6_flags & IN6_IFF_DETACHED) 2054 continue; 2055 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2056 if (ip6_use_deprecated) 2057 dep[0] = ia; 2058 continue; 2059 } 2060 2061 if (dst_scope != in6_addrscope(IFA_IN6(ifa))) 2062 continue; 2063 /* 2064 * call in6_matchlen() as few as possible 2065 */ 2066 if (best_ia == NULL) { 2067 best_ia = ia; 2068 continue; 2069 } 2070 if (blen == -1) 2071 blen = in6_matchlen(&best_ia->ia_addr.sin6_addr, dst); 2072 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2073 if (tlen > blen) { 2074 blen = tlen; 2075 best_ia = ia; 2076 } else if (tlen == blen) 2077 best_ia = bestia(best_ia, ia); 2078 } 2079 if (best_ia != NULL) 2080 return best_ia; 2081 2082 IFADDR_READER_FOREACH(ifa, ifp) { 2083 if (ifa->ifa_addr->sa_family != AF_INET6) 2084 continue; 2085 ia = (struct in6_ifaddr *)ifa; 2086 if (ia->ia6_flags & IN6_IFF_ANYCAST) 2087 continue; /* XXX: is there any case to allow anycast? */ 2088 if (ia->ia6_flags & IN6_IFF_NOTREADY) 2089 continue; /* don't use this interface */ 2090 if (ia->ia6_flags & IN6_IFF_DETACHED) 2091 continue; 2092 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2093 if (ip6_use_deprecated) 2094 dep[1] = (struct in6_ifaddr *)ifa; 2095 continue; 2096 } 2097 2098 best_ia = bestia(best_ia, ia); 2099 } 2100 if (best_ia != NULL) 2101 return best_ia; 2102 2103 /* use the last-resort values, that are, deprecated addresses */ 2104 if (dep[0]) 2105 return dep[0]; 2106 if (dep[1]) 2107 return dep[1]; 2108 2109 return NULL; 2110 } 2111 2112 /* 2113 * perform DAD when interface becomes IFF_UP. 2114 */ 2115 void 2116 in6_if_link_up(struct ifnet *ifp) 2117 { 2118 struct ifaddr *ifa; 2119 struct in6_ifaddr *ia; 2120 int s, bound; 2121 char ip6buf[INET6_ADDRSTRLEN]; 2122 2123 /* Ensure it's sane to run DAD */ 2124 if (ifp->if_link_state == LINK_STATE_DOWN) 2125 return; 2126 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 2127 return; 2128 2129 bound = curlwp_bind(); 2130 s = pserialize_read_enter(); 2131 IFADDR_READER_FOREACH(ifa, ifp) { 2132 struct psref psref; 2133 2134 if (ifa->ifa_addr->sa_family != AF_INET6) 2135 continue; 2136 2137 ifa_acquire(ifa, &psref); 2138 pserialize_read_exit(s); 2139 ia = (struct in6_ifaddr *)ifa; 2140 2141 /* If detached then mark as tentative */ 2142 if (ia->ia6_flags & IN6_IFF_DETACHED) { 2143 ia->ia6_flags &= ~IN6_IFF_DETACHED; 2144 if (ip6_dad_enabled() && if_do_dad(ifp)) { 2145 ia->ia6_flags |= IN6_IFF_TENTATIVE; 2146 nd6log(LOG_ERR, "%s marked tentative\n", 2147 IN6_PRINT(ip6buf, 2148 &ia->ia_addr.sin6_addr)); 2149 } else if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) 2150 rt_addrmsg(RTM_NEWADDR, ifa); 2151 } 2152 2153 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2154 int rand_delay; 2155 2156 /* Clear the duplicated flag as we're starting DAD. */ 2157 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; 2158 2159 /* 2160 * The TENTATIVE flag was likely set by hand 2161 * beforehand, implicitly indicating the need for DAD. 2162 * We may be able to skip the random delay in this 2163 * case, but we impose delays just in case. 2164 */ 2165 rand_delay = cprng_fast32() % 2166 (MAX_RTR_SOLICITATION_DELAY * hz); 2167 /* +1 ensures callout is always used */ 2168 nd6_dad_start(ifa, rand_delay + 1); 2169 } 2170 2171 s = pserialize_read_enter(); 2172 ifa_release(ifa, &psref); 2173 } 2174 pserialize_read_exit(s); 2175 curlwp_bindx(bound); 2176 } 2177 2178 void 2179 in6_if_up(struct ifnet *ifp) 2180 { 2181 2182 /* 2183 * special cases, like 6to4, are handled in in6_ifattach 2184 */ 2185 in6_ifattach(ifp, NULL); 2186 2187 /* interface may not support link state, so bring it up also */ 2188 in6_if_link_up(ifp); 2189 } 2190 2191 /* 2192 * Mark all addresses as detached. 2193 */ 2194 void 2195 in6_if_link_down(struct ifnet *ifp) 2196 { 2197 struct ifaddr *ifa; 2198 struct in6_ifaddr *ia; 2199 int s, bound; 2200 char ip6buf[INET6_ADDRSTRLEN]; 2201 2202 bound = curlwp_bind(); 2203 s = pserialize_read_enter(); 2204 IFADDR_READER_FOREACH(ifa, ifp) { 2205 struct psref psref; 2206 2207 if (ifa->ifa_addr->sa_family != AF_INET6) 2208 continue; 2209 2210 ifa_acquire(ifa, &psref); 2211 pserialize_read_exit(s); 2212 ia = (struct in6_ifaddr *)ifa; 2213 2214 /* Stop DAD processing */ 2215 nd6_dad_stop(ifa); 2216 2217 /* 2218 * Mark the address as detached. 2219 * This satisfies RFC4862 Section 5.3, but we should apply 2220 * this logic to all addresses to be a good citizen and 2221 * avoid potential duplicated addresses. 2222 * When the interface comes up again, detached addresses 2223 * are marked tentative and DAD commences. 2224 */ 2225 if (!(ia->ia6_flags & IN6_IFF_DETACHED)) { 2226 nd6log(LOG_DEBUG, "%s marked detached\n", 2227 IN6_PRINT(ip6buf, &ia->ia_addr.sin6_addr)); 2228 ia->ia6_flags |= IN6_IFF_DETACHED; 2229 ia->ia6_flags &= 2230 ~(IN6_IFF_TENTATIVE | IN6_IFF_DUPLICATED); 2231 rt_addrmsg(RTM_NEWADDR, ifa); 2232 } 2233 2234 s = pserialize_read_enter(); 2235 ifa_release(ifa, &psref); 2236 } 2237 pserialize_read_exit(s); 2238 curlwp_bindx(bound); 2239 } 2240 2241 void 2242 in6_if_down(struct ifnet *ifp) 2243 { 2244 2245 in6_if_link_down(ifp); 2246 lltable_purge_entries(LLTABLE6(ifp)); 2247 } 2248 2249 void 2250 in6_if_link_state_change(struct ifnet *ifp, int link_state) 2251 { 2252 2253 switch (link_state) { 2254 case LINK_STATE_DOWN: 2255 in6_if_link_down(ifp); 2256 break; 2257 case LINK_STATE_UP: 2258 in6_if_link_up(ifp); 2259 break; 2260 } 2261 } 2262 2263 int 2264 in6_tunnel_validate(const struct ip6_hdr *ip6, const struct in6_addr *src, 2265 const struct in6_addr *dst) 2266 { 2267 2268 /* check for address match */ 2269 if (!IN6_ARE_ADDR_EQUAL(src, &ip6->ip6_dst) || 2270 !IN6_ARE_ADDR_EQUAL(dst, &ip6->ip6_src)) 2271 return 0; 2272 2273 /* martian filters on outer source - done in ip6_input */ 2274 2275 /* NOTE: the packet may be dropped by uRPF. */ 2276 2277 /* return valid bytes length */ 2278 return sizeof(*src) + sizeof(*dst); 2279 } 2280 2281 #define IN6_LLTBL_DEFAULT_HSIZE 32 2282 #define IN6_LLTBL_HASH(k, h) \ 2283 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 2284 2285 /* 2286 * Do actual deallocation of @lle. 2287 * Called by LLE_FREE_LOCKED when number of references 2288 * drops to zero. 2289 */ 2290 static void 2291 in6_lltable_destroy_lle(struct llentry *lle) 2292 { 2293 2294 KASSERTMSG(lle->la_numheld == 0, "la_numheld=%d", lle->la_numheld); 2295 2296 LLE_WUNLOCK(lle); 2297 LLE_LOCK_DESTROY(lle); 2298 llentry_pool_put(lle); 2299 } 2300 2301 static struct llentry * 2302 in6_lltable_new(const struct in6_addr *addr6, u_int flags) 2303 { 2304 struct llentry *lle; 2305 2306 lle = llentry_pool_get(PR_NOWAIT); 2307 if (lle == NULL) /* NB: caller generates msg */ 2308 return NULL; 2309 2310 lle->r_l3addr.addr6 = *addr6; 2311 lle->lle_refcnt = 1; 2312 lle->lle_free = in6_lltable_destroy_lle; 2313 LLE_LOCK_INIT(lle); 2314 callout_init(&lle->lle_timer, CALLOUT_MPSAFE); 2315 2316 return lle; 2317 } 2318 2319 static int 2320 in6_lltable_match_prefix(const struct sockaddr *prefix, 2321 const struct sockaddr *mask, u_int flags, struct llentry *lle) 2322 { 2323 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix; 2324 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask; 2325 2326 if (IN6_ARE_MASKED_ADDR_EQUAL(&lle->r_l3addr.addr6, 2327 &pfx->sin6_addr, &msk->sin6_addr) && 2328 ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) 2329 return 1; 2330 2331 return 0; 2332 } 2333 2334 static void 2335 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle) 2336 { 2337 2338 LLE_WLOCK_ASSERT(lle); 2339 (void) llentry_free(lle); 2340 } 2341 2342 static int 2343 in6_lltable_rtcheck(struct ifnet *ifp, u_int flags, 2344 const struct sockaddr *l3addr, const struct rtentry *rt) 2345 { 2346 char ip6buf[INET6_ADDRSTRLEN]; 2347 2348 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 2349 int s; 2350 struct ifaddr *ifa; 2351 /* 2352 * Create an ND6 cache for an IPv6 neighbor 2353 * that is not covered by our own prefix. 2354 */ 2355 /* XXX ifaof_ifpforaddr should take a const param */ 2356 s = pserialize_read_enter(); 2357 ifa = ifaof_ifpforaddr(l3addr, ifp); 2358 if (ifa != NULL) { 2359 pserialize_read_exit(s); 2360 return 0; 2361 } 2362 pserialize_read_exit(s); 2363 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2364 IN6_PRINT(ip6buf, 2365 &((const struct sockaddr_in6 *)l3addr)->sin6_addr)); 2366 return EINVAL; 2367 } 2368 return 0; 2369 } 2370 2371 static inline uint32_t 2372 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize) 2373 { 2374 2375 return IN6_LLTBL_HASH(dst->s6_addr32[3], hsize); 2376 } 2377 2378 static uint32_t 2379 in6_lltable_hash(const struct llentry *lle, uint32_t hsize) 2380 { 2381 2382 return in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize); 2383 } 2384 2385 static void 2386 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 2387 { 2388 struct sockaddr_in6 *sin6; 2389 2390 sin6 = (struct sockaddr_in6 *)sa; 2391 bzero(sin6, sizeof(*sin6)); 2392 sin6->sin6_family = AF_INET6; 2393 sin6->sin6_len = sizeof(*sin6); 2394 sin6->sin6_addr = lle->r_l3addr.addr6; 2395 } 2396 2397 static inline struct llentry * 2398 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst) 2399 { 2400 struct llentry *lle; 2401 struct llentries *lleh; 2402 u_int hashidx; 2403 2404 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize); 2405 lleh = &llt->lle_head[hashidx]; 2406 LIST_FOREACH(lle, lleh, lle_next) { 2407 if (lle->la_flags & LLE_DELETED) 2408 continue; 2409 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst)) 2410 break; 2411 } 2412 2413 return lle; 2414 } 2415 2416 static int 2417 in6_lltable_delete(struct lltable *llt, u_int flags, 2418 const struct sockaddr *l3addr) 2419 { 2420 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2421 struct llentry *lle; 2422 2423 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp); 2424 KASSERTMSG(l3addr->sa_family == AF_INET6, 2425 "sin_family %d", l3addr->sa_family); 2426 2427 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2428 2429 if (lle == NULL) { 2430 #ifdef LLTABLE_DEBUG 2431 char buf[64]; 2432 sockaddr_format(l3addr, buf, sizeof(buf)); 2433 log(LOG_INFO, "%s: cache for %s is not found\n", 2434 __func__, buf); 2435 #endif 2436 return ENOENT; 2437 } 2438 2439 LLE_WLOCK(lle); 2440 #ifdef LLTABLE_DEBUG 2441 { 2442 char buf[64]; 2443 sockaddr_format(l3addr, buf, sizeof(buf)); 2444 log(LOG_INFO, "%s: cache for %s (%p) is deleted\n", 2445 __func__, buf, lle); 2446 } 2447 #endif 2448 llentry_free(lle); 2449 2450 return 0; 2451 } 2452 2453 static struct llentry * 2454 in6_lltable_create(struct lltable *llt, u_int flags, 2455 const struct sockaddr *l3addr, const struct rtentry *rt) 2456 { 2457 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2458 struct ifnet *ifp = llt->llt_ifp; 2459 struct llentry *lle; 2460 2461 IF_AFDATA_WLOCK_ASSERT(ifp); 2462 KASSERTMSG(l3addr->sa_family == AF_INET6, 2463 "sin_family %d", l3addr->sa_family); 2464 2465 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2466 2467 if (lle != NULL) { 2468 LLE_WLOCK(lle); 2469 return lle; 2470 } 2471 2472 /* 2473 * A route that covers the given address must have 2474 * been installed 1st because we are doing a resolution, 2475 * verify this. 2476 */ 2477 if (!(flags & LLE_IFADDR) && 2478 in6_lltable_rtcheck(ifp, flags, l3addr, rt) != 0) 2479 return NULL; 2480 2481 lle = in6_lltable_new(&sin6->sin6_addr, flags); 2482 if (lle == NULL) { 2483 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2484 return NULL; 2485 } 2486 lle->la_flags = flags; 2487 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 2488 memcpy(&lle->ll_addr, CLLADDR(ifp->if_sadl), ifp->if_addrlen); 2489 lle->la_flags |= LLE_VALID; 2490 } 2491 2492 lltable_link_entry(llt, lle); 2493 LLE_WLOCK(lle); 2494 2495 return lle; 2496 } 2497 2498 static struct llentry * 2499 in6_lltable_lookup(struct lltable *llt, u_int flags, 2500 const struct sockaddr *l3addr) 2501 { 2502 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2503 struct llentry *lle; 2504 2505 IF_AFDATA_LOCK_ASSERT(llt->llt_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 return NULL; 2513 2514 if (flags & LLE_EXCLUSIVE) 2515 LLE_WLOCK(lle); 2516 else 2517 LLE_RLOCK(lle); 2518 return lle; 2519 } 2520 2521 static int 2522 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 2523 struct rt_walkarg *w) 2524 { 2525 struct sockaddr_in6 sin6; 2526 2527 LLTABLE_LOCK_ASSERT(); 2528 2529 /* skip deleted entries */ 2530 if (lle->la_flags & LLE_DELETED) 2531 return 0; 2532 2533 sockaddr_in6_init(&sin6, &lle->r_l3addr.addr6, 0, 0, 0); 2534 2535 return lltable_dump_entry(llt, lle, w, sin6tosa(&sin6)); 2536 } 2537 2538 static struct lltable * 2539 in6_lltattach(struct ifnet *ifp) 2540 { 2541 struct lltable *llt; 2542 2543 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE); 2544 llt->llt_af = AF_INET6; 2545 llt->llt_ifp = ifp; 2546 2547 llt->llt_lookup = in6_lltable_lookup; 2548 llt->llt_create = in6_lltable_create; 2549 llt->llt_delete = in6_lltable_delete; 2550 llt->llt_dump_entry = in6_lltable_dump_entry; 2551 llt->llt_hash = in6_lltable_hash; 2552 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry; 2553 llt->llt_free_entry = in6_lltable_free_entry; 2554 llt->llt_match_prefix = in6_lltable_match_prefix; 2555 lltable_link(llt); 2556 2557 return llt; 2558 } 2559 2560 void * 2561 in6_domifattach(struct ifnet *ifp) 2562 { 2563 struct in6_ifextra *ext; 2564 2565 ext = malloc(sizeof(*ext), M_IFADDR, M_WAITOK|M_ZERO); 2566 2567 ext->in6_ifstat = malloc(sizeof(struct in6_ifstat), 2568 M_IFADDR, M_WAITOK|M_ZERO); 2569 2570 ext->icmp6_ifstat = malloc(sizeof(struct icmp6_ifstat), 2571 M_IFADDR, M_WAITOK|M_ZERO); 2572 2573 ext->nd_ifinfo = nd6_ifattach(ifp); 2574 ext->scope6_id = scope6_ifattach(ifp); 2575 ext->lltable = in6_lltattach(ifp); 2576 2577 return ext; 2578 } 2579 2580 void 2581 in6_domifdetach(struct ifnet *ifp, void *aux) 2582 { 2583 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2584 2585 lltable_free(ext->lltable); 2586 ext->lltable = NULL; 2587 SOFTNET_LOCK_UNLESS_NET_MPSAFE(); 2588 nd6_ifdetach(ifp, ext); 2589 SOFTNET_UNLOCK_UNLESS_NET_MPSAFE(); 2590 free(ext->in6_ifstat, M_IFADDR); 2591 free(ext->icmp6_ifstat, M_IFADDR); 2592 scope6_ifdetach(ext->scope6_id); 2593 free(ext, M_IFADDR); 2594 } 2595 2596 /* 2597 * Convert IPv4 address stored in struct in_addr to IPv4-Mapped IPv6 address 2598 * stored in struct in6_addr as defined in RFC 4921 section 2.5.5.2. 2599 */ 2600 void 2601 in6_in_2_v4mapin6(const struct in_addr *in, struct in6_addr *in6) 2602 { 2603 in6->s6_addr32[0] = 0; 2604 in6->s6_addr32[1] = 0; 2605 in6->s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2606 in6->s6_addr32[3] = in->s_addr; 2607 } 2608 2609 /* 2610 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2611 * v4 mapped addr or v4 compat addr 2612 */ 2613 void 2614 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2615 { 2616 memset(sin, 0, sizeof(*sin)); 2617 sin->sin_len = sizeof(struct sockaddr_in); 2618 sin->sin_family = AF_INET; 2619 sin->sin_port = sin6->sin6_port; 2620 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2621 } 2622 2623 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2624 void 2625 in6_sin_2_v4mapsin6(const struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2626 { 2627 memset(sin6, 0, sizeof(*sin6)); 2628 sin6->sin6_len = sizeof(struct sockaddr_in6); 2629 sin6->sin6_family = AF_INET6; 2630 sin6->sin6_port = sin->sin_port; 2631 in6_in_2_v4mapin6(&sin->sin_addr, &sin6->sin6_addr); 2632 } 2633 2634 /* Convert sockaddr_in6 into sockaddr_in. */ 2635 void 2636 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2637 { 2638 struct sockaddr_in *sin_p; 2639 struct sockaddr_in6 sin6; 2640 2641 /* 2642 * Save original sockaddr_in6 addr and convert it 2643 * to sockaddr_in. 2644 */ 2645 sin6 = *(struct sockaddr_in6 *)nam; 2646 sin_p = (struct sockaddr_in *)nam; 2647 in6_sin6_2_sin(sin_p, &sin6); 2648 } 2649 2650 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2651 void 2652 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2653 { 2654 struct sockaddr_in *sin_p; 2655 struct sockaddr_in6 *sin6_p; 2656 2657 sin6_p = malloc(sizeof(*sin6_p), M_SONAME, M_WAITOK); 2658 sin_p = (struct sockaddr_in *)*nam; 2659 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2660 free(*nam, M_SONAME); 2661 *nam = sin6tosa(sin6_p); 2662 } 2663