in6.c revision 1.263
1 /* $NetBSD: in6.c,v 1.263 2018/03/06 07:25:27 ozaki-r 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 1.263 2018/03/06 07:25:27 ozaki-r 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 #include <net/net_osdep.h> 109 110 #ifdef COMPAT_50 111 #include <compat/netinet6/in6_var.h> 112 #endif 113 114 MALLOC_DEFINE(M_IP6OPT, "ip6_options", "IPv6 options"); 115 116 /* enable backward compatibility code for obsoleted ioctls */ 117 #define COMPAT_IN6IFIOCTL 118 119 #ifdef IN6_DEBUG 120 #define IN6_DPRINTF(__fmt, ...) printf(__fmt, __VA_ARGS__) 121 #else 122 #define IN6_DPRINTF(__fmt, ...) do { } while (/*CONSTCOND*/0) 123 #endif /* IN6_DEBUG */ 124 125 /* 126 * Definitions of some constant IP6 addresses. 127 */ 128 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 129 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 130 const struct in6_addr in6addr_nodelocal_allnodes = 131 IN6ADDR_NODELOCAL_ALLNODES_INIT; 132 const struct in6_addr in6addr_linklocal_allnodes = 133 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 134 const struct in6_addr in6addr_linklocal_allrouters = 135 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 136 137 const struct in6_addr in6mask0 = IN6MASK0; 138 const struct in6_addr in6mask32 = IN6MASK32; 139 const struct in6_addr in6mask64 = IN6MASK64; 140 const struct in6_addr in6mask96 = IN6MASK96; 141 const struct in6_addr in6mask128 = IN6MASK128; 142 143 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6, 144 0, 0, IN6ADDR_ANY_INIT, 0}; 145 146 struct pslist_head in6_ifaddr_list; 147 kmutex_t in6_ifaddr_lock; 148 149 static int in6_lifaddr_ioctl(struct socket *, u_long, void *, 150 struct ifnet *); 151 static int in6_ifaddprefix(struct in6_ifaddr *); 152 static int in6_ifremprefix(struct in6_ifaddr *); 153 static int in6_ifinit(struct ifnet *, struct in6_ifaddr *, 154 const struct sockaddr_in6 *, int); 155 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 156 static int in6_update_ifa1(struct ifnet *, struct in6_aliasreq *, 157 struct in6_ifaddr **, struct psref *, int); 158 159 void 160 in6_init(void) 161 { 162 163 PSLIST_INIT(&in6_ifaddr_list); 164 mutex_init(&in6_ifaddr_lock, MUTEX_DEFAULT, IPL_NONE); 165 166 in6_sysctl_multicast_setup(NULL); 167 } 168 169 /* 170 * Add ownaddr as loopback rtentry. We previously add the route only if 171 * necessary (ex. on a p2p link). However, since we now manage addresses 172 * separately from prefixes, we should always add the route. We can't 173 * rely on the cloning mechanism from the corresponding interface route 174 * any more. 175 */ 176 void 177 in6_ifaddlocal(struct ifaddr *ifa) 178 { 179 180 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &in6addr_any) || 181 (ifa->ifa_ifp->if_flags & IFF_POINTOPOINT && 182 IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), IFA_DSTIN6(ifa)))) 183 { 184 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 185 return; 186 } 187 188 rt_ifa_addlocal(ifa); 189 } 190 191 /* 192 * Remove loopback rtentry of ownaddr generated by in6_ifaddlocal(), 193 * if it exists. 194 */ 195 void 196 in6_ifremlocal(struct ifaddr *ifa) 197 { 198 struct in6_ifaddr *ia; 199 struct ifaddr *alt_ifa = NULL; 200 int ia_count = 0; 201 struct psref psref; 202 int s; 203 204 /* 205 * Some of BSD variants do not remove cloned routes 206 * from an interface direct route, when removing the direct route 207 * (see comments in net/net_osdep.h). Even for variants that do remove 208 * cloned routes, they could fail to remove the cloned routes when 209 * we handle multple addresses that share a common prefix. 210 * So, we should remove the route corresponding to the deleted address. 211 */ 212 213 /* 214 * Delete the entry only if exactly one ifaddr matches the 215 * address, ifa->ifa_addr. 216 * 217 * If more than one ifaddr matches, replace the ifaddr in 218 * the routing table, rt_ifa, with a different ifaddr than 219 * the one we are purging, ifa. It is important to do 220 * this, or else the routing table can accumulate dangling 221 * pointers rt->rt_ifa->ifa_ifp to destroyed interfaces, 222 * which will lead to crashes, later. (More than one ifaddr 223 * can match if we assign the same address to multiple---probably 224 * p2p---interfaces.) 225 * 226 * XXX An old comment at this place said, "we should avoid 227 * XXX such a configuration [i.e., interfaces with the same 228 * XXX addressed assigned --ed.] in IPv6...". I do not 229 * XXX agree, especially now that I have fixed the dangling 230 * XXX ifp-pointers bug. 231 */ 232 s = pserialize_read_enter(); 233 IN6_ADDRLIST_READER_FOREACH(ia) { 234 if (!IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) 235 continue; 236 if (ia->ia_ifp != ifa->ifa_ifp) 237 alt_ifa = &ia->ia_ifa; 238 if (++ia_count > 1 && alt_ifa != NULL) 239 break; 240 } 241 if (ia_count > 1 && alt_ifa != NULL) 242 ifa_acquire(alt_ifa, &psref); 243 pserialize_read_exit(s); 244 245 if (ia_count == 0) 246 return; 247 248 rt_ifa_remlocal(ifa, ia_count == 1 ? NULL : alt_ifa); 249 250 if (ia_count > 1 && alt_ifa != NULL) 251 ifa_release(alt_ifa, &psref); 252 } 253 254 /* Add prefix route for the network. */ 255 static int 256 in6_ifaddprefix(struct in6_ifaddr *ia) 257 { 258 int error, flags = 0; 259 260 if (in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) == 128) { 261 if (ia->ia_dstaddr.sin6_family != AF_INET6) 262 /* We don't need to install a host route. */ 263 return 0; 264 flags |= RTF_HOST; 265 } 266 267 /* Is this a connected route for neighbour discovery? */ 268 if (nd6_need_cache(ia->ia_ifp)) 269 flags |= RTF_CONNECTED; 270 271 if ((error = rtinit(&ia->ia_ifa, RTM_ADD, RTF_UP | flags)) == 0) 272 ia->ia_flags |= IFA_ROUTE; 273 else if (error == EEXIST) 274 /* Existance of the route is not an error. */ 275 error = 0; 276 277 return error; 278 } 279 280 /* Delete network prefix route if present. 281 * Re-add it to another address if the prefix matches. */ 282 static int 283 in6_ifremprefix(struct in6_ifaddr *target) 284 { 285 int error, s; 286 struct in6_ifaddr *ia; 287 288 if ((target->ia_flags & IFA_ROUTE) == 0) 289 return 0; 290 291 s = pserialize_read_enter(); 292 IN6_ADDRLIST_READER_FOREACH(ia) { 293 if (target->ia_dstaddr.sin6_len) { 294 if (ia->ia_dstaddr.sin6_len == 0 || 295 !IN6_ARE_ADDR_EQUAL(&ia->ia_dstaddr.sin6_addr, 296 &target->ia_dstaddr.sin6_addr)) 297 continue; 298 } else { 299 if (!IN6_ARE_MASKED_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 300 &target->ia_addr.sin6_addr, 301 &target->ia_prefixmask.sin6_addr)) 302 continue; 303 } 304 305 /* 306 * if we got a matching prefix route, move IFA_ROUTE to him 307 */ 308 if ((ia->ia_flags & IFA_ROUTE) == 0) { 309 struct psref psref; 310 int bound = curlwp_bind(); 311 312 ia6_acquire(ia, &psref); 313 pserialize_read_exit(s); 314 315 rtinit(&target->ia_ifa, RTM_DELETE, 0); 316 target->ia_flags &= ~IFA_ROUTE; 317 318 error = in6_ifaddprefix(ia); 319 320 ia6_release(ia, &psref); 321 curlwp_bindx(bound); 322 323 return error; 324 } 325 } 326 pserialize_read_exit(s); 327 328 /* 329 * noone seem to have prefix route. remove it. 330 */ 331 rtinit(&target->ia_ifa, RTM_DELETE, 0); 332 target->ia_flags &= ~IFA_ROUTE; 333 return 0; 334 } 335 336 int 337 in6_mask2len(struct in6_addr *mask, u_char *lim0) 338 { 339 int x = 0, y; 340 u_char *lim = lim0, *p; 341 342 /* ignore the scope_id part */ 343 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 344 lim = (u_char *)mask + sizeof(*mask); 345 for (p = (u_char *)mask; p < lim; x++, p++) { 346 if (*p != 0xff) 347 break; 348 } 349 y = 0; 350 if (p < lim) { 351 for (y = 0; y < NBBY; y++) { 352 if ((*p & (0x80 >> y)) == 0) 353 break; 354 } 355 } 356 357 /* 358 * when the limit pointer is given, do a stricter check on the 359 * remaining bits. 360 */ 361 if (p < lim) { 362 if (y != 0 && (*p & (0x00ff >> y)) != 0) 363 return -1; 364 for (p = p + 1; p < lim; p++) 365 if (*p != 0) 366 return -1; 367 } 368 369 return x * NBBY + y; 370 } 371 372 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 373 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 374 375 static int 376 in6_control1(struct socket *so, u_long cmd, void *data, struct ifnet *ifp) 377 { 378 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 379 struct in6_ifaddr *ia = NULL; 380 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 381 struct sockaddr_in6 *sa6; 382 int error, bound; 383 struct psref psref; 384 385 switch (cmd) { 386 case SIOCAADDRCTL_POLICY: 387 case SIOCDADDRCTL_POLICY: 388 /* Privileged. */ 389 return in6_src_ioctl(cmd, data); 390 /* 391 * XXX: Fix me, once we fix SIOCSIFADDR, SIOCIFDSTADDR, etc. 392 */ 393 case SIOCSIFADDR: 394 case SIOCSIFDSTADDR: 395 case SIOCSIFBRDADDR: 396 case SIOCSIFNETMASK: 397 return EOPNOTSUPP; 398 case SIOCGETSGCNT_IN6: 399 case SIOCGETMIFCNT_IN6: 400 return mrt6_ioctl(cmd, data); 401 case SIOCGIFADDRPREF: 402 case SIOCSIFADDRPREF: 403 if (ifp == NULL) 404 return EINVAL; 405 return ifaddrpref_ioctl(so, cmd, data, ifp); 406 } 407 408 if (ifp == NULL) 409 return EOPNOTSUPP; 410 411 switch (cmd) { 412 case SIOCSNDFLUSH_IN6: 413 case SIOCSPFXFLUSH_IN6: 414 case SIOCSRTRFLUSH_IN6: 415 case SIOCSDEFIFACE_IN6: 416 case SIOCSIFINFO_FLAGS: 417 case SIOCSIFINFO_IN6: 418 /* Privileged. */ 419 /* FALLTHROUGH */ 420 case OSIOCGIFINFO_IN6: 421 case SIOCGIFINFO_IN6: 422 case SIOCGDRLST_IN6: 423 case SIOCGPRLST_IN6: 424 case SIOCGNBRINFO_IN6: 425 case SIOCGDEFIFACE_IN6: 426 return nd6_ioctl(cmd, data, ifp); 427 } 428 429 switch (cmd) { 430 case SIOCSIFPREFIX_IN6: 431 case SIOCDIFPREFIX_IN6: 432 case SIOCAIFPREFIX_IN6: 433 case SIOCCIFPREFIX_IN6: 434 case SIOCSGIFPREFIX_IN6: 435 case SIOCGIFPREFIX_IN6: 436 log(LOG_NOTICE, 437 "prefix ioctls are now invalidated. " 438 "please use ifconfig.\n"); 439 return EOPNOTSUPP; 440 } 441 442 switch (cmd) { 443 case SIOCALIFADDR: 444 case SIOCDLIFADDR: 445 /* Privileged. */ 446 /* FALLTHROUGH */ 447 case SIOCGLIFADDR: 448 return in6_lifaddr_ioctl(so, cmd, data, ifp); 449 } 450 451 /* 452 * Find address for this interface, if it exists. 453 * 454 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 455 * only, and used the first interface address as the target of other 456 * operations (without checking ifra_addr). This was because netinet 457 * code/API assumed at most 1 interface address per interface. 458 * Since IPv6 allows a node to assign multiple addresses 459 * on a single interface, we almost always look and check the 460 * presence of ifra_addr, and reject invalid ones here. 461 * It also decreases duplicated code among SIOC*_IN6 operations. 462 */ 463 switch (cmd) { 464 case SIOCAIFADDR_IN6: 465 #ifdef OSIOCAIFADDR_IN6 466 case OSIOCAIFADDR_IN6: 467 #endif 468 #ifdef OSIOCSIFPHYADDR_IN6 469 case OSIOCSIFPHYADDR_IN6: 470 #endif 471 case SIOCSIFPHYADDR_IN6: 472 sa6 = &ifra->ifra_addr; 473 break; 474 case SIOCSIFADDR_IN6: 475 case SIOCGIFADDR_IN6: 476 case SIOCSIFDSTADDR_IN6: 477 case SIOCSIFNETMASK_IN6: 478 case SIOCGIFDSTADDR_IN6: 479 case SIOCGIFNETMASK_IN6: 480 case SIOCDIFADDR_IN6: 481 case SIOCGIFPSRCADDR_IN6: 482 case SIOCGIFPDSTADDR_IN6: 483 case SIOCGIFAFLAG_IN6: 484 case SIOCSNDFLUSH_IN6: 485 case SIOCSPFXFLUSH_IN6: 486 case SIOCSRTRFLUSH_IN6: 487 case SIOCGIFALIFETIME_IN6: 488 #ifdef OSIOCGIFALIFETIME_IN6 489 case OSIOCGIFALIFETIME_IN6: 490 #endif 491 case SIOCGIFSTAT_IN6: 492 case SIOCGIFSTAT_ICMP6: 493 sa6 = &ifr->ifr_addr; 494 break; 495 default: 496 sa6 = NULL; 497 break; 498 } 499 500 error = 0; 501 bound = curlwp_bind(); 502 if (sa6 && sa6->sin6_family == AF_INET6) { 503 if (sa6->sin6_scope_id != 0) 504 error = sa6_embedscope(sa6, 0); 505 else 506 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 507 if (error != 0) 508 goto out; 509 ia = in6ifa_ifpwithaddr_psref(ifp, &sa6->sin6_addr, &psref); 510 } else 511 ia = NULL; 512 513 switch (cmd) { 514 case SIOCSIFADDR_IN6: 515 case SIOCSIFDSTADDR_IN6: 516 case SIOCSIFNETMASK_IN6: 517 /* 518 * Since IPv6 allows a node to assign multiple addresses 519 * on a single interface, SIOCSIFxxx ioctls are deprecated. 520 */ 521 error = EINVAL; 522 goto release; 523 524 case SIOCDIFADDR_IN6: 525 /* 526 * for IPv4, we look for existing in_ifaddr here to allow 527 * "ifconfig if0 delete" to remove the first IPv4 address on 528 * the interface. For IPv6, as the spec allows multiple 529 * interface address from the day one, we consider "remove the 530 * first one" semantics to be not preferable. 531 */ 532 if (ia == NULL) { 533 error = EADDRNOTAVAIL; 534 goto out; 535 } 536 /* FALLTHROUGH */ 537 #ifdef OSIOCAIFADDR_IN6 538 case OSIOCAIFADDR_IN6: 539 #endif 540 case SIOCAIFADDR_IN6: 541 /* 542 * We always require users to specify a valid IPv6 address for 543 * the corresponding operation. 544 */ 545 if (ifra->ifra_addr.sin6_family != AF_INET6 || 546 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 547 error = EAFNOSUPPORT; 548 goto release; 549 } 550 /* Privileged. */ 551 552 break; 553 554 case SIOCGIFADDR_IN6: 555 /* This interface is basically deprecated. use SIOCGIFCONF. */ 556 /* FALLTHROUGH */ 557 case SIOCGIFAFLAG_IN6: 558 case SIOCGIFNETMASK_IN6: 559 case SIOCGIFDSTADDR_IN6: 560 case SIOCGIFALIFETIME_IN6: 561 #ifdef OSIOCGIFALIFETIME_IN6 562 case OSIOCGIFALIFETIME_IN6: 563 #endif 564 /* must think again about its semantics */ 565 if (ia == NULL) { 566 error = EADDRNOTAVAIL; 567 goto out; 568 } 569 break; 570 } 571 572 switch (cmd) { 573 574 case SIOCGIFADDR_IN6: 575 ifr->ifr_addr = ia->ia_addr; 576 error = sa6_recoverscope(&ifr->ifr_addr); 577 break; 578 579 case SIOCGIFDSTADDR_IN6: 580 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 581 error = EINVAL; 582 break; 583 } 584 /* 585 * XXX: should we check if ifa_dstaddr is NULL and return 586 * an error? 587 */ 588 ifr->ifr_dstaddr = ia->ia_dstaddr; 589 error = sa6_recoverscope(&ifr->ifr_dstaddr); 590 break; 591 592 case SIOCGIFNETMASK_IN6: 593 ifr->ifr_addr = ia->ia_prefixmask; 594 break; 595 596 case SIOCGIFAFLAG_IN6: 597 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 598 break; 599 600 case SIOCGIFSTAT_IN6: 601 if (ifp == NULL) { 602 error = EINVAL; 603 break; 604 } 605 memset(&ifr->ifr_ifru.ifru_stat, 0, 606 sizeof(ifr->ifr_ifru.ifru_stat)); 607 ifr->ifr_ifru.ifru_stat = 608 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat; 609 break; 610 611 case SIOCGIFSTAT_ICMP6: 612 if (ifp == NULL) { 613 error = EINVAL; 614 break; 615 } 616 memset(&ifr->ifr_ifru.ifru_icmp6stat, 0, 617 sizeof(ifr->ifr_ifru.ifru_icmp6stat)); 618 ifr->ifr_ifru.ifru_icmp6stat = 619 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat; 620 break; 621 622 #ifdef OSIOCGIFALIFETIME_IN6 623 case OSIOCGIFALIFETIME_IN6: 624 #endif 625 case SIOCGIFALIFETIME_IN6: 626 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 627 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 628 time_t maxexpire; 629 struct in6_addrlifetime *retlt = 630 &ifr->ifr_ifru.ifru_lifetime; 631 632 /* 633 * XXX: adjust expiration time assuming time_t is 634 * signed. 635 */ 636 maxexpire = ((time_t)~0) & 637 ~((time_t)1 << ((sizeof(maxexpire) * NBBY) - 1)); 638 if (ia->ia6_lifetime.ia6t_vltime < 639 maxexpire - ia->ia6_updatetime) { 640 retlt->ia6t_expire = ia->ia6_updatetime + 641 ia->ia6_lifetime.ia6t_vltime; 642 retlt->ia6t_expire = retlt->ia6t_expire ? 643 time_mono_to_wall(retlt->ia6t_expire) : 644 0; 645 } else 646 retlt->ia6t_expire = maxexpire; 647 } 648 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 649 time_t maxexpire; 650 struct in6_addrlifetime *retlt = 651 &ifr->ifr_ifru.ifru_lifetime; 652 653 /* 654 * XXX: adjust expiration time assuming time_t is 655 * signed. 656 */ 657 maxexpire = ((time_t)~0) & 658 ~((time_t)1 << ((sizeof(maxexpire) * NBBY) - 1)); 659 if (ia->ia6_lifetime.ia6t_pltime < 660 maxexpire - ia->ia6_updatetime) { 661 retlt->ia6t_preferred = ia->ia6_updatetime + 662 ia->ia6_lifetime.ia6t_pltime; 663 retlt->ia6t_preferred = retlt->ia6t_preferred ? 664 time_mono_to_wall(retlt->ia6t_preferred) : 665 0; 666 } else 667 retlt->ia6t_preferred = maxexpire; 668 } 669 #ifdef OSIOCFIFALIFETIME_IN6 670 if (cmd == OSIOCFIFALIFETIME_IN6) 671 in6_addrlifetime_to_in6_addrlifetime50( 672 &ifr->ifru.ifru_lifetime); 673 #endif 674 break; 675 676 #ifdef OSIOCAIFADDR_IN6 677 case OSIOCAIFADDR_IN6: 678 in6_aliasreq50_to_in6_aliasreq(ifra); 679 /*FALLTHROUGH*/ 680 #endif 681 case SIOCAIFADDR_IN6: 682 { 683 struct in6_addrlifetime *lt; 684 685 /* reject read-only flags */ 686 if ((ifra->ifra_flags & IN6_IFF_DUPLICATED) != 0 || 687 (ifra->ifra_flags & IN6_IFF_DETACHED) != 0 || 688 (ifra->ifra_flags & IN6_IFF_TENTATIVE) != 0 || 689 (ifra->ifra_flags & IN6_IFF_NODAD) != 0 || 690 (ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0) { 691 error = EINVAL; 692 break; 693 } 694 /* 695 * ia6t_expire and ia6t_preferred won't be used for now, 696 * so just in case. 697 */ 698 lt = &ifra->ifra_lifetime; 699 if (lt->ia6t_expire != 0) 700 lt->ia6t_expire = time_wall_to_mono(lt->ia6t_expire); 701 if (lt->ia6t_preferred != 0) 702 lt->ia6t_preferred = 703 time_wall_to_mono(lt->ia6t_preferred); 704 /* 705 * make (ia == NULL) or update (ia != NULL) the interface 706 * address structure, and link it to the list. 707 */ 708 int s = splsoftnet(); 709 error = in6_update_ifa1(ifp, ifra, &ia, &psref, 0); 710 splx(s); 711 if (error) 712 break; 713 pfil_run_addrhooks(if_pfil, cmd, &ia->ia_ifa); 714 break; 715 } 716 717 case SIOCDIFADDR_IN6: 718 ia6_release(ia, &psref); 719 ifaref(&ia->ia_ifa); 720 in6_purgeaddr(&ia->ia_ifa); 721 pfil_run_addrhooks(if_pfil, cmd, &ia->ia_ifa); 722 ifafree(&ia->ia_ifa); 723 ia = NULL; 724 break; 725 726 default: 727 error = ENOTTY; 728 } 729 release: 730 ia6_release(ia, &psref); 731 out: 732 curlwp_bindx(bound); 733 return error; 734 } 735 736 int 737 in6_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp) 738 { 739 int error, s; 740 741 switch (cmd) { 742 case SIOCSNDFLUSH_IN6: 743 case SIOCSPFXFLUSH_IN6: 744 case SIOCSRTRFLUSH_IN6: 745 case SIOCSDEFIFACE_IN6: 746 case SIOCSIFINFO_FLAGS: 747 case SIOCSIFINFO_IN6: 748 749 case SIOCALIFADDR: 750 case SIOCDLIFADDR: 751 752 case SIOCDIFADDR_IN6: 753 #ifdef OSIOCAIFADDR_IN6 754 case OSIOCAIFADDR_IN6: 755 #endif 756 case SIOCAIFADDR_IN6: 757 758 case SIOCAADDRCTL_POLICY: 759 case SIOCDADDRCTL_POLICY: 760 761 if (kauth_authorize_network(curlwp->l_cred, 762 KAUTH_NETWORK_SOCKET, 763 KAUTH_REQ_NETWORK_SOCKET_SETPRIV, 764 so, NULL, NULL)) 765 return EPERM; 766 break; 767 } 768 769 s = splsoftnet(); 770 #ifndef NET_MPSAFE 771 KASSERT(KERNEL_LOCKED_P()); 772 #endif 773 error = in6_control1(so , cmd, data, ifp); 774 splx(s); 775 return error; 776 } 777 778 static int 779 in6_get_llsol_addr(struct in6_addr *llsol, struct ifnet *ifp, 780 struct in6_addr *ip6) 781 { 782 int error; 783 784 memset(llsol, 0, sizeof(struct in6_addr)); 785 llsol->s6_addr16[0] = htons(0xff02); 786 llsol->s6_addr32[1] = 0; 787 llsol->s6_addr32[2] = htonl(1); 788 llsol->s6_addr32[3] = ip6->s6_addr32[3]; 789 llsol->s6_addr8[12] = 0xff; 790 791 error = in6_setscope(llsol, ifp, NULL); 792 if (error != 0) { 793 /* XXX: should not happen */ 794 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 795 } 796 797 return error; 798 } 799 800 static int 801 in6_join_mcastgroups(struct in6_aliasreq *ifra, struct in6_ifaddr *ia, 802 struct ifnet *ifp, int flags) 803 { 804 int error; 805 struct sockaddr_in6 mltaddr, mltmask; 806 struct in6_multi_mship *imm; 807 struct in6_addr llsol; 808 struct rtentry *rt; 809 int dad_delay; 810 char ip6buf[INET6_ADDRSTRLEN]; 811 812 /* join solicited multicast addr for new host id */ 813 error = in6_get_llsol_addr(&llsol, ifp, &ifra->ifra_addr.sin6_addr); 814 if (error != 0) 815 goto out; 816 dad_delay = 0; 817 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 818 /* 819 * We need a random delay for DAD on the address 820 * being configured. It also means delaying 821 * transmission of the corresponding MLD report to 822 * avoid report collision. 823 * [draft-ietf-ipv6-rfc2462bis-02.txt] 824 */ 825 dad_delay = cprng_fast32() % (MAX_RTR_SOLICITATION_DELAY * hz); 826 } 827 828 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */ 829 /* join solicited multicast addr for new host id */ 830 imm = in6_joingroup(ifp, &llsol, &error, dad_delay); 831 if (!imm) { 832 nd6log(LOG_ERR, 833 "addmulti failed for %s on %s (errno=%d)\n", 834 IN6_PRINT(ip6buf, &llsol), if_name(ifp), error); 835 goto out; 836 } 837 mutex_enter(&in6_ifaddr_lock); 838 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 839 mutex_exit(&in6_ifaddr_lock); 840 841 sockaddr_in6_init(&mltmask, &in6mask32, 0, 0, 0); 842 843 /* 844 * join link-local all-nodes address 845 */ 846 sockaddr_in6_init(&mltaddr, &in6addr_linklocal_allnodes, 847 0, 0, 0); 848 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 849 goto out; /* XXX: should not fail */ 850 851 /* 852 * XXX: do we really need this automatic routes? 853 * We should probably reconsider this stuff. Most applications 854 * actually do not need the routes, since they usually specify 855 * the outgoing interface. 856 */ 857 rt = rtalloc1(sin6tosa(&mltaddr), 0); 858 if (rt) { 859 if (memcmp(&mltaddr.sin6_addr, 860 &satocsin6(rt_getkey(rt))->sin6_addr, 861 MLTMASK_LEN)) { 862 rt_unref(rt); 863 rt = NULL; 864 } else if (rt->rt_ifp != ifp) { 865 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 866 "network %04x:%04x::/32 = %04x:%04x::/32\n", 867 __func__, rt->rt_ifp, ifp, ifp->if_xname, 868 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 869 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 870 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 871 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 872 rt_replace_ifa(rt, &ia->ia_ifa); 873 rt->rt_ifp = ifp; 874 } 875 } 876 if (!rt) { 877 struct rt_addrinfo info; 878 879 memset(&info, 0, sizeof(info)); 880 info.rti_info[RTAX_DST] = sin6tosa(&mltaddr); 881 info.rti_info[RTAX_GATEWAY] = sin6tosa(&ia->ia_addr); 882 info.rti_info[RTAX_NETMASK] = sin6tosa(&mltmask); 883 info.rti_info[RTAX_IFA] = sin6tosa(&ia->ia_addr); 884 /* XXX: we need RTF_CONNECTED to fake nd6_rtrequest */ 885 info.rti_flags = RTF_UP | RTF_CONNECTED; 886 error = rtrequest1(RTM_ADD, &info, NULL); 887 if (error) 888 goto out; 889 } else { 890 rt_unref(rt); 891 } 892 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 893 if (!imm) { 894 nd6log(LOG_WARNING, 895 "addmulti failed for %s on %s (errno=%d)\n", 896 IN6_PRINT(ip6buf, &mltaddr.sin6_addr), 897 if_name(ifp), error); 898 goto out; 899 } 900 mutex_enter(&in6_ifaddr_lock); 901 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 902 mutex_exit(&in6_ifaddr_lock); 903 904 /* 905 * join node information group address 906 */ 907 dad_delay = 0; 908 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 909 /* 910 * The spec doesn't say anything about delay for this 911 * group, but the same logic should apply. 912 */ 913 dad_delay = cprng_fast32() % (MAX_RTR_SOLICITATION_DELAY * hz); 914 } 915 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr) != 0) 916 ; 917 else if ((imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 918 dad_delay)) == NULL) { /* XXX jinmei */ 919 nd6log(LOG_WARNING, 920 "addmulti failed for %s on %s (errno=%d)\n", 921 IN6_PRINT(ip6buf, &mltaddr.sin6_addr), 922 if_name(ifp), error); 923 /* XXX not very fatal, go on... */ 924 } else { 925 mutex_enter(&in6_ifaddr_lock); 926 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 927 mutex_exit(&in6_ifaddr_lock); 928 } 929 930 931 /* 932 * join interface-local all-nodes address. 933 * (ff01::1%ifN, and ff01::%ifN/32) 934 */ 935 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 936 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 937 goto out; /* XXX: should not fail */ 938 939 /* XXX: again, do we really need the route? */ 940 rt = rtalloc1(sin6tosa(&mltaddr), 0); 941 if (rt) { 942 /* 32bit came from "mltmask" */ 943 if (memcmp(&mltaddr.sin6_addr, 944 &satocsin6(rt_getkey(rt))->sin6_addr, 945 32 / NBBY)) { 946 rt_unref(rt); 947 rt = NULL; 948 } else if (rt->rt_ifp != ifp) { 949 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 950 "network %04x:%04x::/32 = %04x:%04x::/32\n", 951 __func__, rt->rt_ifp, ifp, ifp->if_xname, 952 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 953 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 954 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 955 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 956 rt_replace_ifa(rt, &ia->ia_ifa); 957 rt->rt_ifp = ifp; 958 } 959 } 960 if (!rt) { 961 struct rt_addrinfo info; 962 963 memset(&info, 0, sizeof(info)); 964 info.rti_info[RTAX_DST] = sin6tosa(&mltaddr); 965 info.rti_info[RTAX_GATEWAY] = sin6tosa(&ia->ia_addr); 966 info.rti_info[RTAX_NETMASK] = sin6tosa(&mltmask); 967 info.rti_info[RTAX_IFA] = sin6tosa(&ia->ia_addr); 968 info.rti_flags = RTF_UP | RTF_CONNECTED; 969 error = rtrequest1(RTM_ADD, &info, NULL); 970 if (error) 971 goto out; 972 #undef MLTMASK_LEN 973 } else { 974 rt_unref(rt); 975 } 976 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 977 if (!imm) { 978 nd6log(LOG_WARNING, 979 "addmulti failed for %s on %s (errno=%d)\n", 980 IN6_PRINT(ip6buf, &mltaddr.sin6_addr), 981 if_name(ifp), error); 982 goto out; 983 } else { 984 mutex_enter(&in6_ifaddr_lock); 985 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 986 mutex_exit(&in6_ifaddr_lock); 987 } 988 return 0; 989 990 out: 991 KASSERT(error != 0); 992 return error; 993 } 994 995 /* 996 * Update parameters of an IPv6 interface address. 997 * If necessary, a new entry is created and linked into address chains. 998 * This function is separated from in6_control(). 999 * XXX: should this be performed under splsoftnet()? 1000 */ 1001 static int 1002 in6_update_ifa1(struct ifnet *ifp, struct in6_aliasreq *ifra, 1003 struct in6_ifaddr **iap, struct psref *psref, int flags) 1004 { 1005 int error = 0, hostIsNew = 0, plen = -1; 1006 struct sockaddr_in6 dst6; 1007 struct in6_addrlifetime *lt; 1008 int dad_delay, was_tentative; 1009 struct in6_ifaddr *ia = iap ? *iap : NULL; 1010 char ip6buf[INET6_ADDRSTRLEN]; 1011 1012 KASSERT((iap == NULL && psref == NULL) || 1013 (iap != NULL && psref != NULL)); 1014 1015 /* Validate parameters */ 1016 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 1017 return EINVAL; 1018 1019 /* 1020 * The destination address for a p2p link must have a family 1021 * of AF_UNSPEC or AF_INET6. 1022 */ 1023 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 1024 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 1025 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 1026 return EAFNOSUPPORT; 1027 /* 1028 * validate ifra_prefixmask. don't check sin6_family, netmask 1029 * does not carry fields other than sin6_len. 1030 */ 1031 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 1032 return EINVAL; 1033 /* 1034 * Because the IPv6 address architecture is classless, we require 1035 * users to specify a (non 0) prefix length (mask) for a new address. 1036 * We also require the prefix (when specified) mask is valid, and thus 1037 * reject a non-consecutive mask. 1038 */ 1039 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 1040 return EINVAL; 1041 if (ifra->ifra_prefixmask.sin6_len != 0) { 1042 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 1043 (u_char *)&ifra->ifra_prefixmask + 1044 ifra->ifra_prefixmask.sin6_len); 1045 if (plen <= 0) 1046 return EINVAL; 1047 } else { 1048 /* 1049 * In this case, ia must not be NULL. We just use its prefix 1050 * length. 1051 */ 1052 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1053 } 1054 /* 1055 * If the destination address on a p2p interface is specified, 1056 * and the address is a scoped one, validate/set the scope 1057 * zone identifier. 1058 */ 1059 dst6 = ifra->ifra_dstaddr; 1060 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 1061 (dst6.sin6_family == AF_INET6)) { 1062 struct in6_addr in6_tmp; 1063 u_int32_t zoneid; 1064 1065 in6_tmp = dst6.sin6_addr; 1066 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 1067 return EINVAL; /* XXX: should be impossible */ 1068 1069 if (dst6.sin6_scope_id != 0) { 1070 if (dst6.sin6_scope_id != zoneid) 1071 return EINVAL; 1072 } else /* user omit to specify the ID. */ 1073 dst6.sin6_scope_id = zoneid; 1074 1075 /* convert into the internal form */ 1076 if (sa6_embedscope(&dst6, 0)) 1077 return EINVAL; /* XXX: should be impossible */ 1078 } 1079 /* 1080 * The destination address can be specified only for a p2p or a 1081 * loopback interface. If specified, the corresponding prefix length 1082 * must be 128. 1083 */ 1084 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 1085 #ifdef FORCE_P2PPLEN 1086 int i; 1087 #endif 1088 1089 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 1090 /* XXX: noisy message */ 1091 nd6log(LOG_INFO, "a destination can " 1092 "be specified for a p2p or a loopback IF only\n"); 1093 return EINVAL; 1094 } 1095 if (plen != 128) { 1096 nd6log(LOG_INFO, "prefixlen should " 1097 "be 128 when dstaddr is specified\n"); 1098 #ifdef FORCE_P2PPLEN 1099 /* 1100 * To be compatible with old configurations, 1101 * such as ifconfig gif0 inet6 2001::1 2001::2 1102 * prefixlen 126, we override the specified 1103 * prefixmask as if the prefix length was 128. 1104 */ 1105 ifra->ifra_prefixmask.sin6_len = 1106 sizeof(struct sockaddr_in6); 1107 for (i = 0; i < 4; i++) 1108 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i] = 1109 0xffffffff; 1110 plen = 128; 1111 #else 1112 return EINVAL; 1113 #endif 1114 } 1115 } 1116 /* lifetime consistency check */ 1117 lt = &ifra->ifra_lifetime; 1118 if (lt->ia6t_pltime > lt->ia6t_vltime) 1119 return EINVAL; 1120 if (lt->ia6t_vltime == 0) { 1121 /* 1122 * the following log might be noisy, but this is a typical 1123 * configuration mistake or a tool's bug. 1124 */ 1125 nd6log(LOG_INFO, "valid lifetime is 0 for %s\n", 1126 IN6_PRINT(ip6buf, &ifra->ifra_addr.sin6_addr)); 1127 1128 if (ia == NULL) 1129 return 0; /* there's nothing to do */ 1130 } 1131 1132 /* 1133 * If this is a new address, allocate a new ifaddr and link it 1134 * into chains. 1135 */ 1136 if (ia == NULL) { 1137 hostIsNew = 1; 1138 /* 1139 * When in6_update_ifa() is called in a process of a received 1140 * RA, it is called under an interrupt context. So, we should 1141 * call malloc with M_NOWAIT. 1142 */ 1143 ia = malloc(sizeof(*ia), M_IFADDR, M_NOWAIT|M_ZERO); 1144 if (ia == NULL) 1145 return ENOBUFS; 1146 LIST_INIT(&ia->ia6_memberships); 1147 /* Initialize the address and masks, and put time stamp */ 1148 ia->ia_ifa.ifa_addr = sin6tosa(&ia->ia_addr); 1149 ia->ia_addr.sin6_family = AF_INET6; 1150 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 1151 ia->ia6_createtime = time_uptime; 1152 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1153 /* 1154 * XXX: some functions expect that ifa_dstaddr is not 1155 * NULL for p2p interfaces. 1156 */ 1157 ia->ia_ifa.ifa_dstaddr = sin6tosa(&ia->ia_dstaddr); 1158 } else { 1159 ia->ia_ifa.ifa_dstaddr = NULL; 1160 } 1161 ia->ia_ifa.ifa_netmask = sin6tosa(&ia->ia_prefixmask); 1162 1163 ia->ia_ifp = ifp; 1164 IN6_ADDRLIST_ENTRY_INIT(ia); 1165 ifa_psref_init(&ia->ia_ifa); 1166 } 1167 1168 /* update timestamp */ 1169 ia->ia6_updatetime = time_uptime; 1170 1171 /* set prefix mask */ 1172 if (ifra->ifra_prefixmask.sin6_len) { 1173 if (ia->ia_prefixmask.sin6_len) { 1174 /* 1175 * We prohibit changing the prefix length of an 1176 * existing autoconf address, because the operation 1177 * would confuse prefix management. 1178 */ 1179 if (ia->ia6_ndpr != NULL && 1180 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != 1181 plen) 1182 { 1183 nd6log(LOG_INFO, "the prefix length of an" 1184 " existing (%s) autoconf address should" 1185 " not be changed\n", 1186 IN6_PRINT(ip6buf, 1187 &ia->ia_addr.sin6_addr)); 1188 error = EINVAL; 1189 if (hostIsNew) 1190 free(ia, M_IFADDR); 1191 return error; 1192 } 1193 1194 if (!IN6_ARE_ADDR_EQUAL(&ia->ia_prefixmask.sin6_addr, 1195 &ifra->ifra_prefixmask.sin6_addr)) 1196 in6_ifremprefix(ia); 1197 } 1198 ia->ia_prefixmask = ifra->ifra_prefixmask; 1199 } 1200 1201 /* Set destination address. */ 1202 if (dst6.sin6_family == AF_INET6) { 1203 if (!IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, 1204 &ia->ia_dstaddr.sin6_addr)) 1205 in6_ifremprefix(ia); 1206 ia->ia_dstaddr = dst6; 1207 } 1208 1209 /* 1210 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1211 * to see if the address is deprecated or invalidated, but initialize 1212 * these members for applications. 1213 */ 1214 ia->ia6_lifetime = ifra->ifra_lifetime; 1215 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1216 ia->ia6_lifetime.ia6t_expire = 1217 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1218 } else 1219 ia->ia6_lifetime.ia6t_expire = 0; 1220 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1221 ia->ia6_lifetime.ia6t_preferred = 1222 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1223 } else 1224 ia->ia6_lifetime.ia6t_preferred = 0; 1225 1226 /* 1227 * configure address flags. 1228 * We need to preserve tentative state so DAD works if 1229 * something adds the same address before DAD finishes. 1230 */ 1231 was_tentative = ia->ia6_flags & (IN6_IFF_TENTATIVE|IN6_IFF_DUPLICATED); 1232 ia->ia6_flags = ifra->ifra_flags; 1233 1234 /* 1235 * Make the address tentative before joining multicast addresses, 1236 * so that corresponding MLD responses would not have a tentative 1237 * source address. 1238 */ 1239 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1240 if (ifp->if_link_state == LINK_STATE_DOWN) { 1241 ia->ia6_flags |= IN6_IFF_DETACHED; 1242 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1243 } else if ((hostIsNew || was_tentative) && if_do_dad(ifp)) 1244 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1245 1246 /* 1247 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1248 * userland, make it deprecated. 1249 */ 1250 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1251 ia->ia6_lifetime.ia6t_pltime = 0; 1252 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1253 } 1254 1255 if (hostIsNew) { 1256 /* 1257 * We need a reference to ia before calling in6_ifinit. 1258 * Otherwise ia can be freed in in6_ifinit accidentally. 1259 */ 1260 ifaref(&ia->ia_ifa); 1261 } 1262 1263 /* Must execute in6_ifinit and ifa_insert atomically */ 1264 mutex_enter(&in6_ifaddr_lock); 1265 1266 /* reset the interface and routing table appropriately. */ 1267 error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew); 1268 if (error != 0) { 1269 if (hostIsNew) 1270 free(ia, M_IFADDR); 1271 mutex_exit(&in6_ifaddr_lock); 1272 return error; 1273 } 1274 1275 /* 1276 * We are done if we have simply modified an existing address. 1277 */ 1278 if (!hostIsNew) { 1279 mutex_exit(&in6_ifaddr_lock); 1280 return error; 1281 } 1282 1283 /* 1284 * Insert ia to the global list and ifa to the interface's list. 1285 * A reference to it is already gained above. 1286 */ 1287 IN6_ADDRLIST_WRITER_INSERT_TAIL(ia); 1288 ifa_insert(ifp, &ia->ia_ifa); 1289 1290 mutex_exit(&in6_ifaddr_lock); 1291 1292 /* 1293 * Beyond this point, we should call in6_purgeaddr upon an error, 1294 * not just go to unlink. 1295 */ 1296 1297 /* join necessary multicast groups */ 1298 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1299 error = in6_join_mcastgroups(ifra, ia, ifp, flags); 1300 if (error != 0) 1301 goto cleanup; 1302 } 1303 1304 if (nd6_need_cache(ifp)) { 1305 /* XXX maybe unnecessary */ 1306 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1307 ia->ia_ifa.ifa_flags |= RTF_CONNECTED; 1308 } 1309 1310 /* 1311 * Perform DAD, if needed. 1312 * XXX It may be of use, if we can administratively 1313 * disable DAD. 1314 */ 1315 if (hostIsNew && if_do_dad(ifp) && 1316 ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && 1317 (ia->ia6_flags & IN6_IFF_TENTATIVE)) 1318 { 1319 int mindelay, maxdelay; 1320 1321 dad_delay = 0; 1322 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1323 struct in6_addr llsol; 1324 struct in6_multi *in6m_sol = NULL; 1325 /* 1326 * We need to impose a delay before sending an NS 1327 * for DAD. Check if we also needed a delay for the 1328 * corresponding MLD message. If we did, the delay 1329 * should be larger than the MLD delay (this could be 1330 * relaxed a bit, but this simple logic is at least 1331 * safe). 1332 */ 1333 mindelay = 0; 1334 error = in6_get_llsol_addr(&llsol, ifp, 1335 &ifra->ifra_addr.sin6_addr); 1336 in6_multi_lock(RW_READER); 1337 if (error == 0) 1338 in6m_sol = in6_lookup_multi(&llsol, ifp); 1339 if (in6m_sol != NULL && 1340 in6m_sol->in6m_state == MLD_REPORTPENDING) { 1341 mindelay = in6m_sol->in6m_timer; 1342 } 1343 in6_multi_unlock(); 1344 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1345 if (maxdelay - mindelay == 0) 1346 dad_delay = 0; 1347 else { 1348 dad_delay = 1349 (cprng_fast32() % (maxdelay - mindelay)) + 1350 mindelay; 1351 } 1352 } 1353 /* +1 ensures callout is always used */ 1354 nd6_dad_start(&ia->ia_ifa, dad_delay + 1); 1355 } 1356 1357 if (iap != NULL) { 1358 *iap = ia; 1359 if (hostIsNew) 1360 ia6_acquire(ia, psref); 1361 } 1362 1363 return 0; 1364 1365 cleanup: 1366 in6_purgeaddr(&ia->ia_ifa); 1367 return error; 1368 } 1369 1370 int 1371 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags) 1372 { 1373 int rc, s; 1374 1375 s = splsoftnet(); 1376 rc = in6_update_ifa1(ifp, ifra, NULL, NULL, flags); 1377 splx(s); 1378 return rc; 1379 } 1380 1381 void 1382 in6_purgeaddr(struct ifaddr *ifa) 1383 { 1384 struct ifnet *ifp = ifa->ifa_ifp; 1385 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1386 struct in6_multi_mship *imm; 1387 1388 /* KASSERT(!ifa_held(ifa)); XXX need ifa_not_held (psref_not_held) */ 1389 KASSERT(IFNET_LOCKED(ifp)); 1390 1391 ifa->ifa_flags |= IFA_DESTROYING; 1392 1393 /* stop DAD processing */ 1394 nd6_dad_stop(ifa); 1395 1396 /* Delete any network route. */ 1397 in6_ifremprefix(ia); 1398 1399 /* Remove ownaddr's loopback rtentry, if it exists. */ 1400 in6_ifremlocal(&(ia->ia_ifa)); 1401 1402 /* 1403 * leave from multicast groups we have joined for the interface 1404 */ 1405 again: 1406 mutex_enter(&in6_ifaddr_lock); 1407 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1408 LIST_REMOVE(imm, i6mm_chain); 1409 mutex_exit(&in6_ifaddr_lock); 1410 KASSERT(imm->i6mm_maddr->in6m_ifp == ifp); 1411 in6_leavegroup(imm); 1412 goto again; 1413 } 1414 mutex_exit(&in6_ifaddr_lock); 1415 1416 in6_unlink_ifa(ia, ifp); 1417 } 1418 1419 static void 1420 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1421 { 1422 int s = splsoftnet(); 1423 1424 mutex_enter(&in6_ifaddr_lock); 1425 IN6_ADDRLIST_WRITER_REMOVE(ia); 1426 ifa_remove(ifp, &ia->ia_ifa); 1427 /* Assume ifa_remove called pserialize_perform and psref_destroy */ 1428 mutex_exit(&in6_ifaddr_lock); 1429 1430 /* 1431 * Release the reference to the ND prefix. 1432 */ 1433 if (ia->ia6_ndpr != NULL) { 1434 nd6_prefix_unref(ia->ia6_ndpr); 1435 ia->ia6_ndpr = NULL; 1436 } 1437 1438 /* 1439 * Also, if the address being removed is autoconf'ed, call 1440 * nd6_pfxlist_onlink_check() since the release might affect the status of 1441 * other (detached) addresses. 1442 */ 1443 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) != 0) { 1444 ND6_WLOCK(); 1445 nd6_pfxlist_onlink_check(); 1446 ND6_UNLOCK(); 1447 } 1448 1449 IN6_ADDRLIST_ENTRY_DESTROY(ia); 1450 1451 /* 1452 * release another refcnt for the link from in6_ifaddr. 1453 * Note that we should decrement the refcnt at least once for all *BSD. 1454 */ 1455 ifafree(&ia->ia_ifa); 1456 1457 splx(s); 1458 } 1459 1460 void 1461 in6_purgeif(struct ifnet *ifp) 1462 { 1463 1464 IFNET_LOCK(ifp); 1465 in6_ifdetach(ifp); 1466 IFNET_UNLOCK(ifp); 1467 } 1468 1469 void 1470 in6_purge_mcast_references(struct in6_multi *in6m) 1471 { 1472 struct in6_ifaddr *ia; 1473 1474 KASSERT(in6_multi_locked(RW_WRITER)); 1475 1476 mutex_enter(&in6_ifaddr_lock); 1477 IN6_ADDRLIST_WRITER_FOREACH(ia) { 1478 struct in6_multi_mship *imm; 1479 LIST_FOREACH(imm, &ia->ia6_memberships, i6mm_chain) { 1480 if (imm->i6mm_maddr == in6m) 1481 imm->i6mm_maddr = NULL; 1482 } 1483 } 1484 mutex_exit(&in6_ifaddr_lock); 1485 } 1486 1487 /* 1488 * SIOC[GAD]LIFADDR. 1489 * SIOCGLIFADDR: get first address. (?) 1490 * SIOCGLIFADDR with IFLR_PREFIX: 1491 * get first address that matches the specified prefix. 1492 * SIOCALIFADDR: add the specified address. 1493 * SIOCALIFADDR with IFLR_PREFIX: 1494 * add the specified prefix, filling hostid part from 1495 * the first link-local address. prefixlen must be <= 64. 1496 * SIOCDLIFADDR: delete the specified address. 1497 * SIOCDLIFADDR with IFLR_PREFIX: 1498 * delete the first address that matches the specified prefix. 1499 * return values: 1500 * EINVAL on invalid parameters 1501 * EADDRNOTAVAIL on prefix match failed/specified address not found 1502 * other values may be returned from in6_ioctl() 1503 * 1504 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1505 * this is to accommodate address naming scheme other than RFC2374, 1506 * in the future. 1507 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1508 * address encoding scheme. (see figure on page 8) 1509 */ 1510 static int 1511 in6_lifaddr_ioctl(struct socket *so, u_long cmd, void *data, 1512 struct ifnet *ifp) 1513 { 1514 struct in6_ifaddr *ia = NULL; /* XXX gcc 4.8 maybe-uninitialized */ 1515 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1516 struct ifaddr *ifa; 1517 struct sockaddr *sa; 1518 1519 /* sanity checks */ 1520 if (!data || !ifp) { 1521 panic("invalid argument to in6_lifaddr_ioctl"); 1522 /* NOTREACHED */ 1523 } 1524 1525 switch (cmd) { 1526 case SIOCGLIFADDR: 1527 /* address must be specified on GET with IFLR_PREFIX */ 1528 if ((iflr->flags & IFLR_PREFIX) == 0) 1529 break; 1530 /* FALLTHROUGH */ 1531 case SIOCALIFADDR: 1532 case SIOCDLIFADDR: 1533 /* address must be specified on ADD and DELETE */ 1534 sa = (struct sockaddr *)&iflr->addr; 1535 if (sa->sa_family != AF_INET6) 1536 return EINVAL; 1537 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1538 return EINVAL; 1539 /* XXX need improvement */ 1540 sa = (struct sockaddr *)&iflr->dstaddr; 1541 if (sa->sa_family && sa->sa_family != AF_INET6) 1542 return EINVAL; 1543 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1544 return EINVAL; 1545 break; 1546 default: /* shouldn't happen */ 1547 #if 0 1548 panic("invalid cmd to in6_lifaddr_ioctl"); 1549 /* NOTREACHED */ 1550 #else 1551 return EOPNOTSUPP; 1552 #endif 1553 } 1554 if (sizeof(struct in6_addr) * NBBY < iflr->prefixlen) 1555 return EINVAL; 1556 1557 switch (cmd) { 1558 case SIOCALIFADDR: 1559 { 1560 struct in6_aliasreq ifra; 1561 struct in6_addr *xhostid = NULL; 1562 int prefixlen; 1563 int bound = curlwp_bind(); 1564 struct psref psref; 1565 1566 if ((iflr->flags & IFLR_PREFIX) != 0) { 1567 struct sockaddr_in6 *sin6; 1568 1569 /* 1570 * xhostid is to fill in the hostid part of the 1571 * address. xhostid points to the first link-local 1572 * address attached to the interface. 1573 */ 1574 ia = in6ifa_ifpforlinklocal_psref(ifp, 0, &psref); 1575 if (ia == NULL) { 1576 curlwp_bindx(bound); 1577 return EADDRNOTAVAIL; 1578 } 1579 xhostid = IFA_IN6(&ia->ia_ifa); 1580 1581 /* prefixlen must be <= 64. */ 1582 if (64 < iflr->prefixlen) { 1583 ia6_release(ia, &psref); 1584 curlwp_bindx(bound); 1585 return EINVAL; 1586 } 1587 prefixlen = iflr->prefixlen; 1588 1589 /* hostid part must be zero. */ 1590 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1591 if (sin6->sin6_addr.s6_addr32[2] != 0 1592 || sin6->sin6_addr.s6_addr32[3] != 0) { 1593 ia6_release(ia, &psref); 1594 curlwp_bindx(bound); 1595 return EINVAL; 1596 } 1597 } else 1598 prefixlen = iflr->prefixlen; 1599 1600 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1601 memset(&ifra, 0, sizeof(ifra)); 1602 memcpy(ifra.ifra_name, iflr->iflr_name, sizeof(ifra.ifra_name)); 1603 1604 memcpy(&ifra.ifra_addr, &iflr->addr, 1605 ((struct sockaddr *)&iflr->addr)->sa_len); 1606 if (xhostid) { 1607 /* fill in hostid part */ 1608 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1609 xhostid->s6_addr32[2]; 1610 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1611 xhostid->s6_addr32[3]; 1612 } 1613 1614 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1615 memcpy(&ifra.ifra_dstaddr, &iflr->dstaddr, 1616 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1617 if (xhostid) { 1618 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1619 xhostid->s6_addr32[2]; 1620 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1621 xhostid->s6_addr32[3]; 1622 } 1623 } 1624 if (xhostid) { 1625 ia6_release(ia, &psref); 1626 ia = NULL; 1627 } 1628 curlwp_bindx(bound); 1629 1630 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1631 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1632 1633 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 1634 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 1635 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1636 return in6_control(so, SIOCAIFADDR_IN6, &ifra, ifp); 1637 } 1638 case SIOCGLIFADDR: 1639 case SIOCDLIFADDR: 1640 { 1641 struct in6_addr mask, candidate, match; 1642 struct sockaddr_in6 *sin6; 1643 int cmp; 1644 int error, s; 1645 1646 memset(&mask, 0, sizeof(mask)); 1647 if (iflr->flags & IFLR_PREFIX) { 1648 /* lookup a prefix rather than address. */ 1649 in6_prefixlen2mask(&mask, iflr->prefixlen); 1650 1651 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1652 memcpy(&match, &sin6->sin6_addr, sizeof(match)); 1653 match.s6_addr32[0] &= mask.s6_addr32[0]; 1654 match.s6_addr32[1] &= mask.s6_addr32[1]; 1655 match.s6_addr32[2] &= mask.s6_addr32[2]; 1656 match.s6_addr32[3] &= mask.s6_addr32[3]; 1657 1658 /* if you set extra bits, that's wrong */ 1659 if (memcmp(&match, &sin6->sin6_addr, sizeof(match))) 1660 return EINVAL; 1661 1662 cmp = 1; 1663 } else { 1664 if (cmd == SIOCGLIFADDR) { 1665 /* on getting an address, take the 1st match */ 1666 cmp = 0; /* XXX */ 1667 } else { 1668 /* on deleting an address, do exact match */ 1669 in6_prefixlen2mask(&mask, 128); 1670 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1671 memcpy(&match, &sin6->sin6_addr, sizeof(match)); 1672 1673 cmp = 1; 1674 } 1675 } 1676 1677 s = pserialize_read_enter(); 1678 IFADDR_READER_FOREACH(ifa, ifp) { 1679 if (ifa->ifa_addr->sa_family != AF_INET6) 1680 continue; 1681 if (!cmp) 1682 break; 1683 1684 /* 1685 * XXX: this is adhoc, but is necessary to allow 1686 * a user to specify fe80::/64 (not /10) for a 1687 * link-local address. 1688 */ 1689 memcpy(&candidate, IFA_IN6(ifa), sizeof(candidate)); 1690 in6_clearscope(&candidate); 1691 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1692 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1693 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1694 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1695 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1696 break; 1697 } 1698 if (!ifa) { 1699 error = EADDRNOTAVAIL; 1700 goto error; 1701 } 1702 ia = ifa2ia6(ifa); 1703 1704 if (cmd == SIOCGLIFADDR) { 1705 /* fill in the if_laddrreq structure */ 1706 memcpy(&iflr->addr, &ia->ia_addr, ia->ia_addr.sin6_len); 1707 error = sa6_recoverscope( 1708 (struct sockaddr_in6 *)&iflr->addr); 1709 if (error != 0) 1710 goto error; 1711 1712 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1713 memcpy(&iflr->dstaddr, &ia->ia_dstaddr, 1714 ia->ia_dstaddr.sin6_len); 1715 error = sa6_recoverscope( 1716 (struct sockaddr_in6 *)&iflr->dstaddr); 1717 if (error != 0) 1718 goto error; 1719 } else 1720 memset(&iflr->dstaddr, 0, sizeof(iflr->dstaddr)); 1721 1722 iflr->prefixlen = 1723 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1724 1725 iflr->flags = ia->ia6_flags; /* XXX */ 1726 1727 error = 0; 1728 } else { 1729 struct in6_aliasreq ifra; 1730 1731 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1732 memset(&ifra, 0, sizeof(ifra)); 1733 memcpy(ifra.ifra_name, iflr->iflr_name, 1734 sizeof(ifra.ifra_name)); 1735 1736 memcpy(&ifra.ifra_addr, &ia->ia_addr, 1737 ia->ia_addr.sin6_len); 1738 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1739 memcpy(&ifra.ifra_dstaddr, &ia->ia_dstaddr, 1740 ia->ia_dstaddr.sin6_len); 1741 } else { 1742 memset(&ifra.ifra_dstaddr, 0, 1743 sizeof(ifra.ifra_dstaddr)); 1744 } 1745 memcpy(&ifra.ifra_dstaddr, &ia->ia_prefixmask, 1746 ia->ia_prefixmask.sin6_len); 1747 1748 ifra.ifra_flags = ia->ia6_flags; 1749 pserialize_read_exit(s); 1750 1751 return in6_control(so, SIOCDIFADDR_IN6, &ifra, ifp); 1752 } 1753 error: 1754 pserialize_read_exit(s); 1755 return error; 1756 } 1757 } 1758 1759 return EOPNOTSUPP; /* just for safety */ 1760 } 1761 1762 /* 1763 * Initialize an interface's internet6 address 1764 * and routing table entry. 1765 */ 1766 static int 1767 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1768 const struct sockaddr_in6 *sin6, int newhost) 1769 { 1770 int error = 0, ifacount = 0; 1771 int s; 1772 struct ifaddr *ifa; 1773 1774 KASSERT(mutex_owned(&in6_ifaddr_lock)); 1775 1776 /* 1777 * Give the interface a chance to initialize 1778 * if this is its first address, 1779 * and to validate the address if necessary. 1780 */ 1781 s = pserialize_read_enter(); 1782 IFADDR_READER_FOREACH(ifa, ifp) { 1783 if (ifa->ifa_addr->sa_family != AF_INET6) 1784 continue; 1785 ifacount++; 1786 } 1787 pserialize_read_exit(s); 1788 1789 ia->ia_addr = *sin6; 1790 1791 if (ifacount == 0 && 1792 (error = if_addr_init(ifp, &ia->ia_ifa, true)) != 0) { 1793 return error; 1794 } 1795 1796 ia->ia_ifa.ifa_metric = ifp->if_metric; 1797 1798 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1799 1800 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1801 if (newhost) { 1802 /* set the rtrequest function to create llinfo */ 1803 if (ifp->if_flags & IFF_POINTOPOINT) 1804 ia->ia_ifa.ifa_rtrequest = p2p_rtrequest; 1805 else if ((ifp->if_flags & IFF_LOOPBACK) == 0) 1806 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1807 in6_ifaddlocal(&ia->ia_ifa); 1808 } else { 1809 /* Inform the routing socket of new flags/timings */ 1810 rt_newaddrmsg(RTM_NEWADDR, &ia->ia_ifa, 0, NULL); 1811 } 1812 1813 /* Add the network prefix route. */ 1814 if ((error = in6_ifaddprefix(ia)) != 0) { 1815 if (newhost) 1816 in6_ifremlocal(&ia->ia_ifa); 1817 return error; 1818 } 1819 1820 return error; 1821 } 1822 1823 static struct ifaddr * 1824 bestifa(struct ifaddr *best_ifa, struct ifaddr *ifa) 1825 { 1826 if (best_ifa == NULL || best_ifa->ifa_preference < ifa->ifa_preference) 1827 return ifa; 1828 return best_ifa; 1829 } 1830 1831 /* 1832 * Find an IPv6 interface link-local address specific to an interface. 1833 */ 1834 struct in6_ifaddr * 1835 in6ifa_ifpforlinklocal(const struct ifnet *ifp, const int ignoreflags) 1836 { 1837 struct ifaddr *best_ifa = NULL, *ifa; 1838 1839 IFADDR_READER_FOREACH(ifa, ifp) { 1840 if (ifa->ifa_addr->sa_family != AF_INET6) 1841 continue; 1842 if (!IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) 1843 continue; 1844 if ((((struct in6_ifaddr *)ifa)->ia6_flags & ignoreflags) != 0) 1845 continue; 1846 best_ifa = bestifa(best_ifa, ifa); 1847 } 1848 1849 return (struct in6_ifaddr *)best_ifa; 1850 } 1851 1852 struct in6_ifaddr * 1853 in6ifa_ifpforlinklocal_psref(const struct ifnet *ifp, const int ignoreflags, 1854 struct psref *psref) 1855 { 1856 struct in6_ifaddr *ia; 1857 int s = pserialize_read_enter(); 1858 1859 ia = in6ifa_ifpforlinklocal(ifp, ignoreflags); 1860 if (ia != NULL) 1861 ia6_acquire(ia, psref); 1862 pserialize_read_exit(s); 1863 1864 return ia; 1865 } 1866 1867 /* 1868 * find the internet address corresponding to a given address. 1869 * ifaddr is returned referenced. 1870 */ 1871 struct in6_ifaddr * 1872 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid) 1873 { 1874 struct in6_ifaddr *ia; 1875 int s; 1876 1877 s = pserialize_read_enter(); 1878 IN6_ADDRLIST_READER_FOREACH(ia) { 1879 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1880 if (zoneid != 0 && 1881 zoneid != ia->ia_addr.sin6_scope_id) 1882 continue; 1883 ifaref(&ia->ia_ifa); 1884 break; 1885 } 1886 } 1887 pserialize_read_exit(s); 1888 1889 return ia; 1890 } 1891 1892 /* 1893 * find the internet address corresponding to a given interface and address. 1894 */ 1895 struct in6_ifaddr * 1896 in6ifa_ifpwithaddr(const struct ifnet *ifp, const struct in6_addr *addr) 1897 { 1898 struct ifaddr *best_ifa = NULL, *ifa; 1899 1900 IFADDR_READER_FOREACH(ifa, ifp) { 1901 if (ifa->ifa_addr->sa_family != AF_INET6) 1902 continue; 1903 if (!IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1904 continue; 1905 best_ifa = bestifa(best_ifa, ifa); 1906 } 1907 1908 return (struct in6_ifaddr *)best_ifa; 1909 } 1910 1911 struct in6_ifaddr * 1912 in6ifa_ifpwithaddr_psref(const struct ifnet *ifp, const struct in6_addr *addr, 1913 struct psref *psref) 1914 { 1915 struct in6_ifaddr *ia; 1916 int s = pserialize_read_enter(); 1917 1918 ia = in6ifa_ifpwithaddr(ifp, addr); 1919 if (ia != NULL) 1920 ia6_acquire(ia, psref); 1921 pserialize_read_exit(s); 1922 1923 return ia; 1924 } 1925 1926 static struct in6_ifaddr * 1927 bestia(struct in6_ifaddr *best_ia, struct in6_ifaddr *ia) 1928 { 1929 if (best_ia == NULL || 1930 best_ia->ia_ifa.ifa_preference < ia->ia_ifa.ifa_preference) 1931 return ia; 1932 return best_ia; 1933 } 1934 1935 /* 1936 * Determine if an address is on a local network. 1937 */ 1938 int 1939 in6_localaddr(const struct in6_addr *in6) 1940 { 1941 struct in6_ifaddr *ia; 1942 int s; 1943 1944 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1945 return 1; 1946 1947 s = pserialize_read_enter(); 1948 IN6_ADDRLIST_READER_FOREACH(ia) { 1949 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1950 &ia->ia_prefixmask.sin6_addr)) { 1951 pserialize_read_exit(s); 1952 return 1; 1953 } 1954 } 1955 pserialize_read_exit(s); 1956 1957 return 0; 1958 } 1959 1960 int 1961 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1962 { 1963 struct in6_ifaddr *ia; 1964 int s; 1965 1966 s = pserialize_read_enter(); 1967 IN6_ADDRLIST_READER_FOREACH(ia) { 1968 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1969 &sa6->sin6_addr) && 1970 #ifdef SCOPEDROUTING 1971 ia->ia_addr.sin6_scope_id == sa6->sin6_scope_id && 1972 #endif 1973 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) { 1974 pserialize_read_exit(s); 1975 return 1; /* true */ 1976 } 1977 1978 /* XXX: do we still have to go thru the rest of the list? */ 1979 } 1980 pserialize_read_exit(s); 1981 1982 return 0; /* false */ 1983 } 1984 1985 /* 1986 * return length of part which dst and src are equal 1987 * hard coding... 1988 */ 1989 int 1990 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1991 { 1992 int match = 0; 1993 u_char *s = (u_char *)src, *d = (u_char *)dst; 1994 u_char *lim = s + 16, r; 1995 1996 while (s < lim) 1997 if ((r = (*d++ ^ *s++)) != 0) { 1998 while (r < 128) { 1999 match++; 2000 r <<= 1; 2001 } 2002 break; 2003 } else 2004 match += NBBY; 2005 return match; 2006 } 2007 2008 /* XXX: to be scope conscious */ 2009 int 2010 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 2011 { 2012 int bytelen, bitlen; 2013 2014 /* sanity check */ 2015 if (len < 0 || len > 128) { 2016 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 2017 len); 2018 return 0; 2019 } 2020 2021 bytelen = len / NBBY; 2022 bitlen = len % NBBY; 2023 2024 if (memcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 2025 return 0; 2026 if (bitlen != 0 && 2027 p1->s6_addr[bytelen] >> (NBBY - bitlen) != 2028 p2->s6_addr[bytelen] >> (NBBY - bitlen)) 2029 return 0; 2030 2031 return 1; 2032 } 2033 2034 void 2035 in6_prefixlen2mask(struct in6_addr *maskp, int len) 2036 { 2037 static const u_char maskarray[NBBY] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 2038 int bytelen, bitlen, i; 2039 2040 /* sanity check */ 2041 if (len < 0 || len > 128) { 2042 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 2043 len); 2044 return; 2045 } 2046 2047 memset(maskp, 0, sizeof(*maskp)); 2048 bytelen = len / NBBY; 2049 bitlen = len % NBBY; 2050 for (i = 0; i < bytelen; i++) 2051 maskp->s6_addr[i] = 0xff; 2052 if (bitlen) 2053 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 2054 } 2055 2056 /* 2057 * return the best address out of the same scope. if no address was 2058 * found, return the first valid address from designated IF. 2059 */ 2060 struct in6_ifaddr * 2061 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2062 { 2063 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2064 struct ifaddr *ifa; 2065 struct in6_ifaddr *best_ia = NULL, *ia; 2066 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2067 2068 dep[0] = dep[1] = NULL; 2069 2070 /* 2071 * We first look for addresses in the same scope. 2072 * If there is one, return it. 2073 * If two or more, return one which matches the dst longest. 2074 * If none, return one of global addresses assigned other ifs. 2075 */ 2076 IFADDR_READER_FOREACH(ifa, ifp) { 2077 if (ifa->ifa_addr->sa_family != AF_INET6) 2078 continue; 2079 ia = (struct in6_ifaddr *)ifa; 2080 if (ia->ia6_flags & IN6_IFF_ANYCAST) 2081 continue; /* XXX: is there any case to allow anycast? */ 2082 if (ia->ia6_flags & IN6_IFF_NOTREADY) 2083 continue; /* don't use this interface */ 2084 if (ia->ia6_flags & IN6_IFF_DETACHED) 2085 continue; 2086 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2087 if (ip6_use_deprecated) 2088 dep[0] = ia; 2089 continue; 2090 } 2091 2092 if (dst_scope != in6_addrscope(IFA_IN6(ifa))) 2093 continue; 2094 /* 2095 * call in6_matchlen() as few as possible 2096 */ 2097 if (best_ia == NULL) { 2098 best_ia = ia; 2099 continue; 2100 } 2101 if (blen == -1) 2102 blen = in6_matchlen(&best_ia->ia_addr.sin6_addr, dst); 2103 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2104 if (tlen > blen) { 2105 blen = tlen; 2106 best_ia = ia; 2107 } else if (tlen == blen) 2108 best_ia = bestia(best_ia, ia); 2109 } 2110 if (best_ia != NULL) 2111 return best_ia; 2112 2113 IFADDR_READER_FOREACH(ifa, ifp) { 2114 if (ifa->ifa_addr->sa_family != AF_INET6) 2115 continue; 2116 ia = (struct in6_ifaddr *)ifa; 2117 if (ia->ia6_flags & IN6_IFF_ANYCAST) 2118 continue; /* XXX: is there any case to allow anycast? */ 2119 if (ia->ia6_flags & IN6_IFF_NOTREADY) 2120 continue; /* don't use this interface */ 2121 if (ia->ia6_flags & IN6_IFF_DETACHED) 2122 continue; 2123 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2124 if (ip6_use_deprecated) 2125 dep[1] = (struct in6_ifaddr *)ifa; 2126 continue; 2127 } 2128 2129 best_ia = bestia(best_ia, ia); 2130 } 2131 if (best_ia != NULL) 2132 return best_ia; 2133 2134 /* use the last-resort values, that are, deprecated addresses */ 2135 if (dep[0]) 2136 return dep[0]; 2137 if (dep[1]) 2138 return dep[1]; 2139 2140 return NULL; 2141 } 2142 2143 /* 2144 * perform DAD when interface becomes IFF_UP. 2145 */ 2146 void 2147 in6_if_link_up(struct ifnet *ifp) 2148 { 2149 struct ifaddr *ifa; 2150 struct in6_ifaddr *ia; 2151 int s, bound; 2152 char ip6buf[INET6_ADDRSTRLEN]; 2153 2154 /* Ensure it's sane to run DAD */ 2155 if (ifp->if_link_state == LINK_STATE_DOWN) 2156 return; 2157 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 2158 return; 2159 2160 bound = curlwp_bind(); 2161 s = pserialize_read_enter(); 2162 IFADDR_READER_FOREACH(ifa, ifp) { 2163 struct psref psref; 2164 2165 if (ifa->ifa_addr->sa_family != AF_INET6) 2166 continue; 2167 2168 ifa_acquire(ifa, &psref); 2169 pserialize_read_exit(s); 2170 ia = (struct in6_ifaddr *)ifa; 2171 2172 /* If detached then mark as tentative */ 2173 if (ia->ia6_flags & IN6_IFF_DETACHED) { 2174 ia->ia6_flags &= ~IN6_IFF_DETACHED; 2175 if (if_do_dad(ifp)) { 2176 ia->ia6_flags |= IN6_IFF_TENTATIVE; 2177 nd6log(LOG_ERR, "%s marked tentative\n", 2178 IN6_PRINT(ip6buf, 2179 &ia->ia_addr.sin6_addr)); 2180 } else if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) 2181 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 2182 } 2183 2184 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2185 int rand_delay; 2186 2187 /* Clear the duplicated flag as we're starting DAD. */ 2188 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; 2189 2190 /* 2191 * The TENTATIVE flag was likely set by hand 2192 * beforehand, implicitly indicating the need for DAD. 2193 * We may be able to skip the random delay in this 2194 * case, but we impose delays just in case. 2195 */ 2196 rand_delay = cprng_fast32() % 2197 (MAX_RTR_SOLICITATION_DELAY * hz); 2198 /* +1 ensures callout is always used */ 2199 nd6_dad_start(ifa, rand_delay + 1); 2200 } 2201 2202 s = pserialize_read_enter(); 2203 ifa_release(ifa, &psref); 2204 } 2205 pserialize_read_exit(s); 2206 curlwp_bindx(bound); 2207 2208 /* Restore any detached prefixes */ 2209 ND6_WLOCK(); 2210 nd6_pfxlist_onlink_check(); 2211 ND6_UNLOCK(); 2212 } 2213 2214 void 2215 in6_if_up(struct ifnet *ifp) 2216 { 2217 2218 /* 2219 * special cases, like 6to4, are handled in in6_ifattach 2220 */ 2221 in6_ifattach(ifp, NULL); 2222 2223 /* interface may not support link state, so bring it up also */ 2224 in6_if_link_up(ifp); 2225 } 2226 2227 /* 2228 * Mark all addresses as detached. 2229 */ 2230 void 2231 in6_if_link_down(struct ifnet *ifp) 2232 { 2233 struct ifaddr *ifa; 2234 struct in6_ifaddr *ia; 2235 int s, bound; 2236 char ip6buf[INET6_ADDRSTRLEN]; 2237 2238 /* Any prefixes on this interface should be detached as well */ 2239 ND6_WLOCK(); 2240 nd6_pfxlist_onlink_check(); 2241 ND6_UNLOCK(); 2242 2243 bound = curlwp_bind(); 2244 s = pserialize_read_enter(); 2245 IFADDR_READER_FOREACH(ifa, ifp) { 2246 struct psref psref; 2247 2248 if (ifa->ifa_addr->sa_family != AF_INET6) 2249 continue; 2250 2251 ifa_acquire(ifa, &psref); 2252 pserialize_read_exit(s); 2253 ia = (struct in6_ifaddr *)ifa; 2254 2255 /* Stop DAD processing */ 2256 nd6_dad_stop(ifa); 2257 2258 /* 2259 * Mark the address as detached. 2260 * This satisfies RFC4862 Section 5.3, but we should apply 2261 * this logic to all addresses to be a good citizen and 2262 * avoid potential duplicated addresses. 2263 * When the interface comes up again, detached addresses 2264 * are marked tentative and DAD commences. 2265 */ 2266 if (!(ia->ia6_flags & IN6_IFF_DETACHED)) { 2267 nd6log(LOG_DEBUG, "%s marked detached\n", 2268 IN6_PRINT(ip6buf, &ia->ia_addr.sin6_addr)); 2269 ia->ia6_flags |= IN6_IFF_DETACHED; 2270 ia->ia6_flags &= 2271 ~(IN6_IFF_TENTATIVE | IN6_IFF_DUPLICATED); 2272 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 2273 } 2274 2275 s = pserialize_read_enter(); 2276 ifa_release(ifa, &psref); 2277 } 2278 pserialize_read_exit(s); 2279 curlwp_bindx(bound); 2280 } 2281 2282 void 2283 in6_if_down(struct ifnet *ifp) 2284 { 2285 2286 in6_if_link_down(ifp); 2287 lltable_purge_entries(LLTABLE6(ifp)); 2288 } 2289 2290 void 2291 in6_if_link_state_change(struct ifnet *ifp, int link_state) 2292 { 2293 2294 switch (link_state) { 2295 case LINK_STATE_DOWN: 2296 in6_if_link_down(ifp); 2297 break; 2298 case LINK_STATE_UP: 2299 in6_if_link_up(ifp); 2300 break; 2301 } 2302 } 2303 2304 /* 2305 * Calculate max IPv6 MTU through all the interfaces and store it 2306 * to in6_maxmtu. 2307 */ 2308 void 2309 in6_setmaxmtu(void) 2310 { 2311 unsigned long maxmtu = 0; 2312 struct ifnet *ifp; 2313 int s; 2314 2315 s = pserialize_read_enter(); 2316 IFNET_READER_FOREACH(ifp) { 2317 /* this function can be called during ifnet initialization */ 2318 if (!ifp->if_afdata[AF_INET6]) 2319 continue; 2320 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2321 IN6_LINKMTU(ifp) > maxmtu) 2322 maxmtu = IN6_LINKMTU(ifp); 2323 } 2324 pserialize_read_exit(s); 2325 if (maxmtu) /* update only when maxmtu is positive */ 2326 in6_maxmtu = maxmtu; 2327 } 2328 2329 int 2330 in6_tunnel_validate(const struct ip6_hdr *ip6, const struct in6_addr *src, 2331 const struct in6_addr *dst) 2332 { 2333 2334 /* check for address match */ 2335 if (!IN6_ARE_ADDR_EQUAL(src, &ip6->ip6_dst) || 2336 !IN6_ARE_ADDR_EQUAL(dst, &ip6->ip6_src)) 2337 return 0; 2338 2339 /* martian filters on outer source - done in ip6_input */ 2340 2341 /* NOTE: the pakcet may be dropped by uRPF. */ 2342 2343 /* return valid bytes length */ 2344 return sizeof(*src) + sizeof(*dst); 2345 } 2346 2347 /* 2348 * Provide the length of interface identifiers to be used for the link attached 2349 * to the given interface. The length should be defined in "IPv6 over 2350 * xxx-link" document. Note that address architecture might also define 2351 * the length for a particular set of address prefixes, regardless of the 2352 * link type. As clarified in rfc2462bis, those two definitions should be 2353 * consistent, and those really are as of August 2004. 2354 */ 2355 int 2356 in6_if2idlen(struct ifnet *ifp) 2357 { 2358 switch (ifp->if_type) { 2359 case IFT_ETHER: /* RFC2464 */ 2360 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2361 case IFT_L2VLAN: /* ditto */ 2362 case IFT_IEEE80211: /* ditto */ 2363 case IFT_FDDI: /* RFC2467 */ 2364 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 2365 case IFT_PPP: /* RFC2472 */ 2366 case IFT_ARCNET: /* RFC2497 */ 2367 case IFT_FRELAY: /* RFC2590 */ 2368 case IFT_IEEE1394: /* RFC3146 */ 2369 case IFT_GIF: /* draft-ietf-v6ops-mech-v2-07 */ 2370 case IFT_LOOP: /* XXX: is this really correct? */ 2371 return 64; 2372 default: 2373 /* 2374 * Unknown link type: 2375 * It might be controversial to use the today's common constant 2376 * of 64 for these cases unconditionally. For full compliance, 2377 * we should return an error in this case. On the other hand, 2378 * if we simply miss the standard for the link type or a new 2379 * standard is defined for a new link type, the IFID length 2380 * is very likely to be the common constant. As a compromise, 2381 * we always use the constant, but make an explicit notice 2382 * indicating the "unknown" case. 2383 */ 2384 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2385 return 64; 2386 } 2387 } 2388 2389 struct in6_llentry { 2390 struct llentry base; 2391 }; 2392 2393 #define IN6_LLTBL_DEFAULT_HSIZE 32 2394 #define IN6_LLTBL_HASH(k, h) \ 2395 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 2396 2397 /* 2398 * Do actual deallocation of @lle. 2399 * Called by LLE_FREE_LOCKED when number of references 2400 * drops to zero. 2401 */ 2402 static void 2403 in6_lltable_destroy_lle(struct llentry *lle) 2404 { 2405 2406 KASSERT(lle->la_numheld == 0); 2407 2408 LLE_WUNLOCK(lle); 2409 LLE_LOCK_DESTROY(lle); 2410 kmem_intr_free(lle, sizeof(struct in6_llentry)); 2411 } 2412 2413 static struct llentry * 2414 in6_lltable_new(const struct in6_addr *addr6, u_int flags) 2415 { 2416 struct in6_llentry *lle; 2417 2418 lle = kmem_intr_zalloc(sizeof(struct in6_llentry), KM_NOSLEEP); 2419 if (lle == NULL) /* NB: caller generates msg */ 2420 return NULL; 2421 2422 lle->base.r_l3addr.addr6 = *addr6; 2423 lle->base.lle_refcnt = 1; 2424 lle->base.lle_free = in6_lltable_destroy_lle; 2425 LLE_LOCK_INIT(&lle->base); 2426 callout_init(&lle->base.lle_timer, CALLOUT_MPSAFE); 2427 2428 return &lle->base; 2429 } 2430 2431 static int 2432 in6_lltable_match_prefix(const struct sockaddr *prefix, 2433 const struct sockaddr *mask, u_int flags, struct llentry *lle) 2434 { 2435 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix; 2436 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask; 2437 2438 if (IN6_ARE_MASKED_ADDR_EQUAL(&lle->r_l3addr.addr6, 2439 &pfx->sin6_addr, &msk->sin6_addr) && 2440 ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) 2441 return 1; 2442 2443 return 0; 2444 } 2445 2446 static void 2447 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle) 2448 { 2449 2450 LLE_WLOCK_ASSERT(lle); 2451 (void) llentry_free(lle); 2452 } 2453 2454 static int 2455 in6_lltable_rtcheck(struct ifnet *ifp, u_int flags, 2456 const struct sockaddr *l3addr, const struct rtentry *rt) 2457 { 2458 char ip6buf[INET6_ADDRSTRLEN]; 2459 2460 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 2461 int s; 2462 struct ifaddr *ifa; 2463 /* 2464 * Create an ND6 cache for an IPv6 neighbor 2465 * that is not covered by our own prefix. 2466 */ 2467 /* XXX ifaof_ifpforaddr should take a const param */ 2468 s = pserialize_read_enter(); 2469 ifa = ifaof_ifpforaddr(l3addr, ifp); 2470 if (ifa != NULL) { 2471 pserialize_read_exit(s); 2472 return 0; 2473 } 2474 pserialize_read_exit(s); 2475 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2476 IN6_PRINT(ip6buf, 2477 &((const struct sockaddr_in6 *)l3addr)->sin6_addr)); 2478 return EINVAL; 2479 } 2480 return 0; 2481 } 2482 2483 static inline uint32_t 2484 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize) 2485 { 2486 2487 return IN6_LLTBL_HASH(dst->s6_addr32[3], hsize); 2488 } 2489 2490 static uint32_t 2491 in6_lltable_hash(const struct llentry *lle, uint32_t hsize) 2492 { 2493 2494 return in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize); 2495 } 2496 2497 static void 2498 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 2499 { 2500 struct sockaddr_in6 *sin6; 2501 2502 sin6 = (struct sockaddr_in6 *)sa; 2503 bzero(sin6, sizeof(*sin6)); 2504 sin6->sin6_family = AF_INET6; 2505 sin6->sin6_len = sizeof(*sin6); 2506 sin6->sin6_addr = lle->r_l3addr.addr6; 2507 } 2508 2509 static inline struct llentry * 2510 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst) 2511 { 2512 struct llentry *lle; 2513 struct llentries *lleh; 2514 u_int hashidx; 2515 2516 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize); 2517 lleh = &llt->lle_head[hashidx]; 2518 LIST_FOREACH(lle, lleh, lle_next) { 2519 if (lle->la_flags & LLE_DELETED) 2520 continue; 2521 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst)) 2522 break; 2523 } 2524 2525 return lle; 2526 } 2527 2528 static int 2529 in6_lltable_delete(struct lltable *llt, u_int flags, 2530 const struct sockaddr *l3addr) 2531 { 2532 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2533 struct llentry *lle; 2534 2535 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp); 2536 KASSERTMSG(l3addr->sa_family == AF_INET6, 2537 "sin_family %d", l3addr->sa_family); 2538 2539 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2540 2541 if (lle == NULL) { 2542 #ifdef LLTABLE_DEBUG 2543 char buf[64]; 2544 sockaddr_format(l3addr, buf, sizeof(buf)); 2545 log(LOG_INFO, "%s: cache for %s is not found\n", 2546 __func__, buf); 2547 #endif 2548 return ENOENT; 2549 } 2550 2551 LLE_WLOCK(lle); 2552 #ifdef LLTABLE_DEBUG 2553 { 2554 char buf[64]; 2555 sockaddr_format(l3addr, buf, sizeof(buf)); 2556 log(LOG_INFO, "%s: cache for %s (%p) is deleted\n", 2557 __func__, buf, lle); 2558 } 2559 #endif 2560 llentry_free(lle); 2561 2562 return 0; 2563 } 2564 2565 static struct llentry * 2566 in6_lltable_create(struct lltable *llt, u_int flags, 2567 const struct sockaddr *l3addr, const struct rtentry *rt) 2568 { 2569 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2570 struct ifnet *ifp = llt->llt_ifp; 2571 struct llentry *lle; 2572 2573 IF_AFDATA_WLOCK_ASSERT(ifp); 2574 KASSERTMSG(l3addr->sa_family == AF_INET6, 2575 "sin_family %d", l3addr->sa_family); 2576 2577 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2578 2579 if (lle != NULL) { 2580 LLE_WLOCK(lle); 2581 return lle; 2582 } 2583 2584 /* 2585 * A route that covers the given address must have 2586 * been installed 1st because we are doing a resolution, 2587 * verify this. 2588 */ 2589 if (!(flags & LLE_IFADDR) && 2590 in6_lltable_rtcheck(ifp, flags, l3addr, rt) != 0) 2591 return NULL; 2592 2593 lle = in6_lltable_new(&sin6->sin6_addr, flags); 2594 if (lle == NULL) { 2595 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2596 return NULL; 2597 } 2598 lle->la_flags = flags; 2599 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 2600 memcpy(&lle->ll_addr, CLLADDR(ifp->if_sadl), ifp->if_addrlen); 2601 lle->la_flags |= LLE_VALID; 2602 } 2603 2604 lltable_link_entry(llt, lle); 2605 LLE_WLOCK(lle); 2606 2607 return lle; 2608 } 2609 2610 static struct llentry * 2611 in6_lltable_lookup(struct lltable *llt, u_int flags, 2612 const struct sockaddr *l3addr) 2613 { 2614 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2615 struct llentry *lle; 2616 2617 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 2618 KASSERTMSG(l3addr->sa_family == AF_INET6, 2619 "sin_family %d", l3addr->sa_family); 2620 2621 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2622 2623 if (lle == NULL) 2624 return NULL; 2625 2626 if (flags & LLE_EXCLUSIVE) 2627 LLE_WLOCK(lle); 2628 else 2629 LLE_RLOCK(lle); 2630 return lle; 2631 } 2632 2633 static int 2634 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 2635 struct rt_walkarg *w) 2636 { 2637 struct sockaddr_in6 sin6; 2638 2639 LLTABLE_LOCK_ASSERT(); 2640 2641 /* skip deleted entries */ 2642 if (lle->la_flags & LLE_DELETED) 2643 return 0; 2644 2645 sockaddr_in6_init(&sin6, &lle->r_l3addr.addr6, 0, 0, 0); 2646 2647 return lltable_dump_entry(llt, lle, w, sin6tosa(&sin6)); 2648 } 2649 2650 static struct lltable * 2651 in6_lltattach(struct ifnet *ifp) 2652 { 2653 struct lltable *llt; 2654 2655 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE); 2656 llt->llt_af = AF_INET6; 2657 llt->llt_ifp = ifp; 2658 2659 llt->llt_lookup = in6_lltable_lookup; 2660 llt->llt_create = in6_lltable_create; 2661 llt->llt_delete = in6_lltable_delete; 2662 llt->llt_dump_entry = in6_lltable_dump_entry; 2663 llt->llt_hash = in6_lltable_hash; 2664 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry; 2665 llt->llt_free_entry = in6_lltable_free_entry; 2666 llt->llt_match_prefix = in6_lltable_match_prefix; 2667 lltable_link(llt); 2668 2669 return llt; 2670 } 2671 2672 void * 2673 in6_domifattach(struct ifnet *ifp) 2674 { 2675 struct in6_ifextra *ext; 2676 2677 ext = malloc(sizeof(*ext), M_IFADDR, M_WAITOK|M_ZERO); 2678 2679 ext->in6_ifstat = malloc(sizeof(struct in6_ifstat), 2680 M_IFADDR, M_WAITOK|M_ZERO); 2681 2682 ext->icmp6_ifstat = malloc(sizeof(struct icmp6_ifstat), 2683 M_IFADDR, M_WAITOK|M_ZERO); 2684 2685 ext->nd_ifinfo = nd6_ifattach(ifp); 2686 ext->scope6_id = scope6_ifattach(ifp); 2687 ext->nprefixes = 0; 2688 ext->ndefrouters = 0; 2689 2690 ext->lltable = in6_lltattach(ifp); 2691 2692 return ext; 2693 } 2694 2695 void 2696 in6_domifdetach(struct ifnet *ifp, void *aux) 2697 { 2698 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2699 2700 lltable_free(ext->lltable); 2701 ext->lltable = NULL; 2702 SOFTNET_LOCK_UNLESS_NET_MPSAFE(); 2703 nd6_ifdetach(ifp, ext); 2704 SOFTNET_UNLOCK_UNLESS_NET_MPSAFE(); 2705 free(ext->in6_ifstat, M_IFADDR); 2706 free(ext->icmp6_ifstat, M_IFADDR); 2707 scope6_ifdetach(ext->scope6_id); 2708 free(ext, M_IFADDR); 2709 } 2710 2711 /* 2712 * Convert IPv4 address stored in struct in_addr to IPv4-Mapped IPv6 address 2713 * stored in struct in6_addr as defined in RFC 4921 section 2.5.5.2. 2714 */ 2715 void 2716 in6_in_2_v4mapin6(const struct in_addr *in, struct in6_addr *in6) 2717 { 2718 in6->s6_addr32[0] = 0; 2719 in6->s6_addr32[1] = 0; 2720 in6->s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2721 in6->s6_addr32[3] = in->s_addr; 2722 } 2723 2724 /* 2725 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2726 * v4 mapped addr or v4 compat addr 2727 */ 2728 void 2729 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2730 { 2731 memset(sin, 0, sizeof(*sin)); 2732 sin->sin_len = sizeof(struct sockaddr_in); 2733 sin->sin_family = AF_INET; 2734 sin->sin_port = sin6->sin6_port; 2735 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2736 } 2737 2738 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2739 void 2740 in6_sin_2_v4mapsin6(const struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2741 { 2742 memset(sin6, 0, sizeof(*sin6)); 2743 sin6->sin6_len = sizeof(struct sockaddr_in6); 2744 sin6->sin6_family = AF_INET6; 2745 sin6->sin6_port = sin->sin_port; 2746 in6_in_2_v4mapin6(&sin->sin_addr, &sin6->sin6_addr); 2747 } 2748 2749 /* Convert sockaddr_in6 into sockaddr_in. */ 2750 void 2751 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2752 { 2753 struct sockaddr_in *sin_p; 2754 struct sockaddr_in6 sin6; 2755 2756 /* 2757 * Save original sockaddr_in6 addr and convert it 2758 * to sockaddr_in. 2759 */ 2760 sin6 = *(struct sockaddr_in6 *)nam; 2761 sin_p = (struct sockaddr_in *)nam; 2762 in6_sin6_2_sin(sin_p, &sin6); 2763 } 2764 2765 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2766 void 2767 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2768 { 2769 struct sockaddr_in *sin_p; 2770 struct sockaddr_in6 *sin6_p; 2771 2772 sin6_p = malloc(sizeof(*sin6_p), M_SONAME, M_WAITOK); 2773 sin_p = (struct sockaddr_in *)*nam; 2774 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2775 free(*nam, M_SONAME); 2776 *nam = sin6tosa(sin6_p); 2777 } 2778
Indexes created Fri Sep 26 20:09:58 GMT 2025