in6.c revision 1.245
1 /* $NetBSD: in6.c,v 1.245 2017/04/28 05:56:33 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 1.245 2017/04/28 05:56:33 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 mutex_enter(softnet_lock); 772 #endif 773 error = in6_control1(so , cmd, data, ifp); 774 #ifndef NET_MPSAFE 775 mutex_exit(softnet_lock); 776 #endif 777 splx(s); 778 return error; 779 } 780 781 static int 782 in6_get_llsol_addr(struct in6_addr *llsol, struct ifnet *ifp, 783 struct in6_addr *ip6) 784 { 785 int error; 786 787 memset(llsol, 0, sizeof(struct in6_addr)); 788 llsol->s6_addr16[0] = htons(0xff02); 789 llsol->s6_addr32[1] = 0; 790 llsol->s6_addr32[2] = htonl(1); 791 llsol->s6_addr32[3] = ip6->s6_addr32[3]; 792 llsol->s6_addr8[12] = 0xff; 793 794 error = in6_setscope(llsol, ifp, NULL); 795 if (error != 0) { 796 /* XXX: should not happen */ 797 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 798 } 799 800 return error; 801 } 802 803 static int 804 in6_join_mcastgroups(struct in6_aliasreq *ifra, struct in6_ifaddr *ia, 805 struct ifnet *ifp, int flags) 806 { 807 int error; 808 struct sockaddr_in6 mltaddr, mltmask; 809 struct in6_multi_mship *imm; 810 struct in6_addr llsol; 811 struct rtentry *rt; 812 int dad_delay; 813 char ip6buf[INET6_ADDRSTRLEN]; 814 815 /* join solicited multicast addr for new host id */ 816 error = in6_get_llsol_addr(&llsol, ifp, &ifra->ifra_addr.sin6_addr); 817 if (error != 0) 818 goto out; 819 dad_delay = 0; 820 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 821 /* 822 * We need a random delay for DAD on the address 823 * being configured. It also means delaying 824 * transmission of the corresponding MLD report to 825 * avoid report collision. 826 * [draft-ietf-ipv6-rfc2462bis-02.txt] 827 */ 828 dad_delay = cprng_fast32() % (MAX_RTR_SOLICITATION_DELAY * hz); 829 } 830 831 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */ 832 /* join solicited multicast addr for new host id */ 833 imm = in6_joingroup(ifp, &llsol, &error, dad_delay); 834 if (!imm) { 835 nd6log(LOG_ERR, 836 "addmulti failed for %s on %s (errno=%d)\n", 837 IN6_PRINT(ip6buf, &llsol), if_name(ifp), error); 838 goto out; 839 } 840 mutex_enter(&in6_ifaddr_lock); 841 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 842 mutex_exit(&in6_ifaddr_lock); 843 844 sockaddr_in6_init(&mltmask, &in6mask32, 0, 0, 0); 845 846 /* 847 * join link-local all-nodes address 848 */ 849 sockaddr_in6_init(&mltaddr, &in6addr_linklocal_allnodes, 850 0, 0, 0); 851 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 852 goto out; /* XXX: should not fail */ 853 854 /* 855 * XXX: do we really need this automatic routes? 856 * We should probably reconsider this stuff. Most applications 857 * actually do not need the routes, since they usually specify 858 * the outgoing interface. 859 */ 860 rt = rtalloc1(sin6tosa(&mltaddr), 0); 861 if (rt) { 862 if (memcmp(&mltaddr.sin6_addr, 863 &satocsin6(rt_getkey(rt))->sin6_addr, 864 MLTMASK_LEN)) { 865 rt_unref(rt); 866 rt = NULL; 867 } else if (rt->rt_ifp != ifp) { 868 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 869 "network %04x:%04x::/32 = %04x:%04x::/32\n", 870 __func__, rt->rt_ifp, ifp, ifp->if_xname, 871 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 872 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 873 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 874 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 875 rt_replace_ifa(rt, &ia->ia_ifa); 876 rt->rt_ifp = ifp; 877 } 878 } 879 if (!rt) { 880 struct rt_addrinfo info; 881 882 memset(&info, 0, sizeof(info)); 883 info.rti_info[RTAX_DST] = sin6tosa(&mltaddr); 884 info.rti_info[RTAX_GATEWAY] = sin6tosa(&ia->ia_addr); 885 info.rti_info[RTAX_NETMASK] = sin6tosa(&mltmask); 886 info.rti_info[RTAX_IFA] = sin6tosa(&ia->ia_addr); 887 /* XXX: we need RTF_CONNECTED to fake nd6_rtrequest */ 888 info.rti_flags = RTF_UP | RTF_CONNECTED; 889 error = rtrequest1(RTM_ADD, &info, NULL); 890 if (error) 891 goto out; 892 } else { 893 rt_unref(rt); 894 } 895 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 896 if (!imm) { 897 nd6log(LOG_WARNING, 898 "addmulti failed for %s on %s (errno=%d)\n", 899 IN6_PRINT(ip6buf, &mltaddr.sin6_addr), 900 if_name(ifp), error); 901 goto out; 902 } 903 mutex_enter(&in6_ifaddr_lock); 904 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 905 mutex_exit(&in6_ifaddr_lock); 906 907 /* 908 * join node information group address 909 */ 910 dad_delay = 0; 911 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 912 /* 913 * The spec doesn't say anything about delay for this 914 * group, but the same logic should apply. 915 */ 916 dad_delay = cprng_fast32() % (MAX_RTR_SOLICITATION_DELAY * hz); 917 } 918 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr) != 0) 919 ; 920 else if ((imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 921 dad_delay)) == NULL) { /* XXX jinmei */ 922 nd6log(LOG_WARNING, 923 "addmulti failed for %s on %s (errno=%d)\n", 924 IN6_PRINT(ip6buf, &mltaddr.sin6_addr), 925 if_name(ifp), error); 926 /* XXX not very fatal, go on... */ 927 } else { 928 mutex_enter(&in6_ifaddr_lock); 929 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 930 mutex_exit(&in6_ifaddr_lock); 931 } 932 933 934 /* 935 * join interface-local all-nodes address. 936 * (ff01::1%ifN, and ff01::%ifN/32) 937 */ 938 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 939 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 940 goto out; /* XXX: should not fail */ 941 942 /* XXX: again, do we really need the route? */ 943 rt = rtalloc1(sin6tosa(&mltaddr), 0); 944 if (rt) { 945 /* 32bit came from "mltmask" */ 946 if (memcmp(&mltaddr.sin6_addr, 947 &satocsin6(rt_getkey(rt))->sin6_addr, 948 32 / NBBY)) { 949 rt_unref(rt); 950 rt = NULL; 951 } else if (rt->rt_ifp != ifp) { 952 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 953 "network %04x:%04x::/32 = %04x:%04x::/32\n", 954 __func__, rt->rt_ifp, ifp, ifp->if_xname, 955 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 956 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 957 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 958 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 959 rt_replace_ifa(rt, &ia->ia_ifa); 960 rt->rt_ifp = ifp; 961 } 962 } 963 if (!rt) { 964 struct rt_addrinfo info; 965 966 memset(&info, 0, sizeof(info)); 967 info.rti_info[RTAX_DST] = sin6tosa(&mltaddr); 968 info.rti_info[RTAX_GATEWAY] = sin6tosa(&ia->ia_addr); 969 info.rti_info[RTAX_NETMASK] = sin6tosa(&mltmask); 970 info.rti_info[RTAX_IFA] = sin6tosa(&ia->ia_addr); 971 info.rti_flags = RTF_UP | RTF_CONNECTED; 972 error = rtrequest1(RTM_ADD, &info, NULL); 973 if (error) 974 goto out; 975 #undef MLTMASK_LEN 976 } else { 977 rt_unref(rt); 978 } 979 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 980 if (!imm) { 981 nd6log(LOG_WARNING, 982 "addmulti failed for %s on %s (errno=%d)\n", 983 IN6_PRINT(ip6buf, &mltaddr.sin6_addr), 984 if_name(ifp), error); 985 goto out; 986 } else { 987 mutex_enter(&in6_ifaddr_lock); 988 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 989 mutex_exit(&in6_ifaddr_lock); 990 } 991 return 0; 992 993 out: 994 KASSERT(error != 0); 995 return error; 996 } 997 998 /* 999 * Update parameters of an IPv6 interface address. 1000 * If necessary, a new entry is created and linked into address chains. 1001 * This function is separated from in6_control(). 1002 * XXX: should this be performed under splsoftnet()? 1003 */ 1004 static int 1005 in6_update_ifa1(struct ifnet *ifp, struct in6_aliasreq *ifra, 1006 struct in6_ifaddr **iap, struct psref *psref, int flags) 1007 { 1008 int error = 0, hostIsNew = 0, plen = -1; 1009 struct sockaddr_in6 dst6; 1010 struct in6_addrlifetime *lt; 1011 int dad_delay, was_tentative; 1012 struct in6_ifaddr *ia = iap ? *iap : NULL; 1013 char ip6buf[INET6_ADDRSTRLEN]; 1014 1015 KASSERT((iap == NULL && psref == NULL) || 1016 (iap != NULL && psref != NULL)); 1017 1018 /* Validate parameters */ 1019 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 1020 return EINVAL; 1021 1022 /* 1023 * The destination address for a p2p link must have a family 1024 * of AF_UNSPEC or AF_INET6. 1025 */ 1026 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 1027 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 1028 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 1029 return EAFNOSUPPORT; 1030 /* 1031 * validate ifra_prefixmask. don't check sin6_family, netmask 1032 * does not carry fields other than sin6_len. 1033 */ 1034 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 1035 return EINVAL; 1036 /* 1037 * Because the IPv6 address architecture is classless, we require 1038 * users to specify a (non 0) prefix length (mask) for a new address. 1039 * We also require the prefix (when specified) mask is valid, and thus 1040 * reject a non-consecutive mask. 1041 */ 1042 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 1043 return EINVAL; 1044 if (ifra->ifra_prefixmask.sin6_len != 0) { 1045 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 1046 (u_char *)&ifra->ifra_prefixmask + 1047 ifra->ifra_prefixmask.sin6_len); 1048 if (plen <= 0) 1049 return EINVAL; 1050 } else { 1051 /* 1052 * In this case, ia must not be NULL. We just use its prefix 1053 * length. 1054 */ 1055 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1056 } 1057 /* 1058 * If the destination address on a p2p interface is specified, 1059 * and the address is a scoped one, validate/set the scope 1060 * zone identifier. 1061 */ 1062 dst6 = ifra->ifra_dstaddr; 1063 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 1064 (dst6.sin6_family == AF_INET6)) { 1065 struct in6_addr in6_tmp; 1066 u_int32_t zoneid; 1067 1068 in6_tmp = dst6.sin6_addr; 1069 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 1070 return EINVAL; /* XXX: should be impossible */ 1071 1072 if (dst6.sin6_scope_id != 0) { 1073 if (dst6.sin6_scope_id != zoneid) 1074 return EINVAL; 1075 } else /* user omit to specify the ID. */ 1076 dst6.sin6_scope_id = zoneid; 1077 1078 /* convert into the internal form */ 1079 if (sa6_embedscope(&dst6, 0)) 1080 return EINVAL; /* XXX: should be impossible */ 1081 } 1082 /* 1083 * The destination address can be specified only for a p2p or a 1084 * loopback interface. If specified, the corresponding prefix length 1085 * must be 128. 1086 */ 1087 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 1088 #ifdef FORCE_P2PPLEN 1089 int i; 1090 #endif 1091 1092 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 1093 /* XXX: noisy message */ 1094 nd6log(LOG_INFO, "a destination can " 1095 "be specified for a p2p or a loopback IF only\n"); 1096 return EINVAL; 1097 } 1098 if (plen != 128) { 1099 nd6log(LOG_INFO, "prefixlen should " 1100 "be 128 when dstaddr is specified\n"); 1101 #ifdef FORCE_P2PPLEN 1102 /* 1103 * To be compatible with old configurations, 1104 * such as ifconfig gif0 inet6 2001::1 2001::2 1105 * prefixlen 126, we override the specified 1106 * prefixmask as if the prefix length was 128. 1107 */ 1108 ifra->ifra_prefixmask.sin6_len = 1109 sizeof(struct sockaddr_in6); 1110 for (i = 0; i < 4; i++) 1111 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i] = 1112 0xffffffff; 1113 plen = 128; 1114 #else 1115 return EINVAL; 1116 #endif 1117 } 1118 } 1119 /* lifetime consistency check */ 1120 lt = &ifra->ifra_lifetime; 1121 if (lt->ia6t_pltime > lt->ia6t_vltime) 1122 return EINVAL; 1123 if (lt->ia6t_vltime == 0) { 1124 /* 1125 * the following log might be noisy, but this is a typical 1126 * configuration mistake or a tool's bug. 1127 */ 1128 nd6log(LOG_INFO, "valid lifetime is 0 for %s\n", 1129 IN6_PRINT(ip6buf, &ifra->ifra_addr.sin6_addr)); 1130 1131 if (ia == NULL) 1132 return 0; /* there's nothing to do */ 1133 } 1134 1135 /* 1136 * If this is a new address, allocate a new ifaddr and link it 1137 * into chains. 1138 */ 1139 if (ia == NULL) { 1140 hostIsNew = 1; 1141 /* 1142 * When in6_update_ifa() is called in a process of a received 1143 * RA, it is called under an interrupt context. So, we should 1144 * call malloc with M_NOWAIT. 1145 */ 1146 ia = malloc(sizeof(*ia), M_IFADDR, M_NOWAIT|M_ZERO); 1147 if (ia == NULL) 1148 return ENOBUFS; 1149 LIST_INIT(&ia->ia6_memberships); 1150 /* Initialize the address and masks, and put time stamp */ 1151 ia->ia_ifa.ifa_addr = sin6tosa(&ia->ia_addr); 1152 ia->ia_addr.sin6_family = AF_INET6; 1153 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 1154 ia->ia6_createtime = time_uptime; 1155 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1156 /* 1157 * XXX: some functions expect that ifa_dstaddr is not 1158 * NULL for p2p interfaces. 1159 */ 1160 ia->ia_ifa.ifa_dstaddr = sin6tosa(&ia->ia_dstaddr); 1161 } else { 1162 ia->ia_ifa.ifa_dstaddr = NULL; 1163 } 1164 ia->ia_ifa.ifa_netmask = sin6tosa(&ia->ia_prefixmask); 1165 1166 ia->ia_ifp = ifp; 1167 IN6_ADDRLIST_ENTRY_INIT(ia); 1168 ifa_psref_init(&ia->ia_ifa); 1169 } 1170 1171 /* update timestamp */ 1172 ia->ia6_updatetime = time_uptime; 1173 1174 /* set prefix mask */ 1175 if (ifra->ifra_prefixmask.sin6_len) { 1176 if (ia->ia_prefixmask.sin6_len) { 1177 /* 1178 * We prohibit changing the prefix length of an 1179 * existing autoconf address, because the operation 1180 * would confuse prefix management. 1181 */ 1182 if (ia->ia6_ndpr != NULL && 1183 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != 1184 plen) 1185 { 1186 nd6log(LOG_INFO, "the prefix length of an" 1187 " existing (%s) autoconf address should" 1188 " not be changed\n", 1189 IN6_PRINT(ip6buf, 1190 &ia->ia_addr.sin6_addr)); 1191 error = EINVAL; 1192 if (hostIsNew) 1193 free(ia, M_IFADDR); 1194 goto exit; 1195 } 1196 1197 if (!IN6_ARE_ADDR_EQUAL(&ia->ia_prefixmask.sin6_addr, 1198 &ifra->ifra_prefixmask.sin6_addr)) 1199 in6_ifremprefix(ia); 1200 } 1201 ia->ia_prefixmask = ifra->ifra_prefixmask; 1202 } 1203 1204 /* Set destination address. */ 1205 if (dst6.sin6_family == AF_INET6) { 1206 if (!IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, 1207 &ia->ia_dstaddr.sin6_addr)) 1208 in6_ifremprefix(ia); 1209 ia->ia_dstaddr = dst6; 1210 } 1211 1212 /* 1213 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1214 * to see if the address is deprecated or invalidated, but initialize 1215 * these members for applications. 1216 */ 1217 ia->ia6_lifetime = ifra->ifra_lifetime; 1218 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1219 ia->ia6_lifetime.ia6t_expire = 1220 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1221 } else 1222 ia->ia6_lifetime.ia6t_expire = 0; 1223 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1224 ia->ia6_lifetime.ia6t_preferred = 1225 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1226 } else 1227 ia->ia6_lifetime.ia6t_preferred = 0; 1228 1229 /* 1230 * configure address flags. 1231 * We need to preserve tentative state so DAD works if 1232 * something adds the same address before DAD finishes. 1233 */ 1234 was_tentative = ia->ia6_flags & (IN6_IFF_TENTATIVE|IN6_IFF_DUPLICATED); 1235 ia->ia6_flags = ifra->ifra_flags; 1236 1237 /* 1238 * Make the address tentative before joining multicast addresses, 1239 * so that corresponding MLD responses would not have a tentative 1240 * source address. 1241 */ 1242 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1243 if (ifp->if_link_state == LINK_STATE_DOWN) { 1244 ia->ia6_flags |= IN6_IFF_DETACHED; 1245 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1246 } else if ((hostIsNew || was_tentative) && if_do_dad(ifp)) 1247 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1248 1249 /* 1250 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1251 * userland, make it deprecated. 1252 */ 1253 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1254 ia->ia6_lifetime.ia6t_pltime = 0; 1255 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1256 } 1257 1258 if (hostIsNew) { 1259 /* 1260 * We need a reference to ia before calling in6_ifinit. 1261 * Otherwise ia can be freed in in6_ifinit accidentally. 1262 */ 1263 ifaref(&ia->ia_ifa); 1264 } 1265 /* reset the interface and routing table appropriately. */ 1266 error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew); 1267 if (error != 0) { 1268 if (hostIsNew) 1269 free(ia, M_IFADDR); 1270 goto exit; 1271 } 1272 1273 /* 1274 * We are done if we have simply modified an existing address. 1275 */ 1276 if (!hostIsNew) 1277 return error; 1278 1279 /* 1280 * Insert ia to the global list and ifa to the interface's list. 1281 * A reference to it is already gained above. 1282 */ 1283 mutex_enter(&in6_ifaddr_lock); 1284 IN6_ADDRLIST_WRITER_INSERT_TAIL(ia); 1285 mutex_exit(&in6_ifaddr_lock); 1286 1287 ifa_insert(ifp, &ia->ia_ifa); 1288 1289 /* 1290 * Beyond this point, we should call in6_purgeaddr upon an error, 1291 * not just go to unlink. 1292 */ 1293 1294 /* join necessary multicast groups */ 1295 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1296 error = in6_join_mcastgroups(ifra, ia, ifp, flags); 1297 if (error != 0) 1298 goto cleanup; 1299 } 1300 1301 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1302 error = nd6_add_ifa_lle(ia); 1303 if (error != 0) 1304 goto cleanup; 1305 1306 /* 1307 * Perform DAD, if needed. 1308 * XXX It may be of use, if we can administratively 1309 * disable DAD. 1310 */ 1311 if (hostIsNew && if_do_dad(ifp) && 1312 ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && 1313 (ia->ia6_flags & IN6_IFF_TENTATIVE)) 1314 { 1315 int mindelay, maxdelay; 1316 1317 dad_delay = 0; 1318 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1319 struct in6_addr llsol; 1320 struct in6_multi *in6m_sol = NULL; 1321 /* 1322 * We need to impose a delay before sending an NS 1323 * for DAD. Check if we also needed a delay for the 1324 * corresponding MLD message. If we did, the delay 1325 * should be larger than the MLD delay (this could be 1326 * relaxed a bit, but this simple logic is at least 1327 * safe). 1328 */ 1329 mindelay = 0; 1330 error = in6_get_llsol_addr(&llsol, ifp, 1331 &ifra->ifra_addr.sin6_addr); 1332 in6_multi_lock(RW_READER); 1333 if (error == 0) 1334 in6m_sol = in6_lookup_multi(&llsol, ifp); 1335 if (in6m_sol != NULL && 1336 in6m_sol->in6m_state == MLD_REPORTPENDING) { 1337 mindelay = in6m_sol->in6m_timer; 1338 } 1339 in6_multi_unlock(); 1340 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1341 if (maxdelay - mindelay == 0) 1342 dad_delay = 0; 1343 else { 1344 dad_delay = 1345 (cprng_fast32() % (maxdelay - mindelay)) + 1346 mindelay; 1347 } 1348 } 1349 /* +1 ensures callout is always used */ 1350 nd6_dad_start(&ia->ia_ifa, dad_delay + 1); 1351 } 1352 1353 if (iap != NULL) { 1354 *iap = ia; 1355 if (hostIsNew) 1356 ia6_acquire(ia, psref); 1357 } 1358 1359 return 0; 1360 1361 cleanup: 1362 in6_purgeaddr(&ia->ia_ifa); 1363 exit: 1364 return error; 1365 } 1366 1367 int 1368 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags) 1369 { 1370 int rc, s; 1371 1372 s = splsoftnet(); 1373 rc = in6_update_ifa1(ifp, ifra, NULL, NULL, flags); 1374 splx(s); 1375 return rc; 1376 } 1377 1378 void 1379 in6_purgeaddr(struct ifaddr *ifa) 1380 { 1381 struct ifnet *ifp = ifa->ifa_ifp; 1382 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1383 struct in6_multi_mship *imm; 1384 1385 KASSERT(!ifa_held(ifa)); 1386 1387 ifa->ifa_flags |= IFA_DESTROYING; 1388 1389 /* stop DAD processing */ 1390 nd6_dad_stop(ifa); 1391 1392 /* Delete any network route. */ 1393 in6_ifremprefix(ia); 1394 1395 /* Remove ownaddr's loopback rtentry, if it exists. */ 1396 in6_ifremlocal(&(ia->ia_ifa)); 1397 1398 /* 1399 * leave from multicast groups we have joined for the interface 1400 */ 1401 mutex_enter(&in6_ifaddr_lock); 1402 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1403 LIST_REMOVE(imm, i6mm_chain); 1404 mutex_exit(&in6_ifaddr_lock); 1405 in6_leavegroup(imm); 1406 mutex_enter(&in6_ifaddr_lock); 1407 } 1408 mutex_exit(&in6_ifaddr_lock); 1409 1410 in6_unlink_ifa(ia, ifp); 1411 } 1412 1413 static void 1414 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1415 { 1416 int s = splsoftnet(); 1417 1418 mutex_enter(&in6_ifaddr_lock); 1419 IN6_ADDRLIST_WRITER_REMOVE(ia); 1420 ifa_remove(ifp, &ia->ia_ifa); 1421 mutex_exit(&in6_ifaddr_lock); 1422 1423 /* 1424 * Release the reference to the ND prefix. 1425 */ 1426 if (ia->ia6_ndpr != NULL) { 1427 nd6_prefix_unref(ia->ia6_ndpr); 1428 ia->ia6_ndpr = NULL; 1429 } 1430 1431 /* 1432 * Also, if the address being removed is autoconf'ed, call 1433 * nd6_pfxlist_onlink_check() since the release might affect the status of 1434 * other (detached) addresses. 1435 */ 1436 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) != 0) { 1437 ND6_WLOCK(); 1438 nd6_pfxlist_onlink_check(); 1439 ND6_UNLOCK(); 1440 } 1441 1442 IN6_ADDRLIST_ENTRY_DESTROY(ia); 1443 1444 /* 1445 * release another refcnt for the link from in6_ifaddr. 1446 * Note that we should decrement the refcnt at least once for all *BSD. 1447 */ 1448 ifafree(&ia->ia_ifa); 1449 1450 splx(s); 1451 } 1452 1453 void 1454 in6_purgeif(struct ifnet *ifp) 1455 { 1456 1457 in6_ifdetach(ifp); 1458 } 1459 1460 void 1461 in6_purge_mcast_references(struct in6_multi *in6m) 1462 { 1463 struct in6_ifaddr *ia; 1464 1465 KASSERT(in6_multi_locked(RW_WRITER)); 1466 1467 mutex_enter(&in6_ifaddr_lock); 1468 IN6_ADDRLIST_WRITER_FOREACH(ia) { 1469 struct in6_multi_mship *imm; 1470 LIST_FOREACH(imm, &ia->ia6_memberships, i6mm_chain) { 1471 if (imm->i6mm_maddr == in6m) 1472 imm->i6mm_maddr = NULL; 1473 } 1474 } 1475 mutex_exit(&in6_ifaddr_lock); 1476 } 1477 1478 /* 1479 * SIOC[GAD]LIFADDR. 1480 * SIOCGLIFADDR: get first address. (?) 1481 * SIOCGLIFADDR with IFLR_PREFIX: 1482 * get first address that matches the specified prefix. 1483 * SIOCALIFADDR: add the specified address. 1484 * SIOCALIFADDR with IFLR_PREFIX: 1485 * add the specified prefix, filling hostid part from 1486 * the first link-local address. prefixlen must be <= 64. 1487 * SIOCDLIFADDR: delete the specified address. 1488 * SIOCDLIFADDR with IFLR_PREFIX: 1489 * delete the first address that matches the specified prefix. 1490 * return values: 1491 * EINVAL on invalid parameters 1492 * EADDRNOTAVAIL on prefix match failed/specified address not found 1493 * other values may be returned from in6_ioctl() 1494 * 1495 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1496 * this is to accommodate address naming scheme other than RFC2374, 1497 * in the future. 1498 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1499 * address encoding scheme. (see figure on page 8) 1500 */ 1501 static int 1502 in6_lifaddr_ioctl(struct socket *so, u_long cmd, void *data, 1503 struct ifnet *ifp) 1504 { 1505 struct in6_ifaddr *ia = NULL; /* XXX gcc 4.8 maybe-uninitialized */ 1506 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1507 struct ifaddr *ifa; 1508 struct sockaddr *sa; 1509 1510 /* sanity checks */ 1511 if (!data || !ifp) { 1512 panic("invalid argument to in6_lifaddr_ioctl"); 1513 /* NOTREACHED */ 1514 } 1515 1516 switch (cmd) { 1517 case SIOCGLIFADDR: 1518 /* address must be specified on GET with IFLR_PREFIX */ 1519 if ((iflr->flags & IFLR_PREFIX) == 0) 1520 break; 1521 /* FALLTHROUGH */ 1522 case SIOCALIFADDR: 1523 case SIOCDLIFADDR: 1524 /* address must be specified on ADD and DELETE */ 1525 sa = (struct sockaddr *)&iflr->addr; 1526 if (sa->sa_family != AF_INET6) 1527 return EINVAL; 1528 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1529 return EINVAL; 1530 /* XXX need improvement */ 1531 sa = (struct sockaddr *)&iflr->dstaddr; 1532 if (sa->sa_family && sa->sa_family != AF_INET6) 1533 return EINVAL; 1534 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1535 return EINVAL; 1536 break; 1537 default: /* shouldn't happen */ 1538 #if 0 1539 panic("invalid cmd to in6_lifaddr_ioctl"); 1540 /* NOTREACHED */ 1541 #else 1542 return EOPNOTSUPP; 1543 #endif 1544 } 1545 if (sizeof(struct in6_addr) * NBBY < iflr->prefixlen) 1546 return EINVAL; 1547 1548 switch (cmd) { 1549 case SIOCALIFADDR: 1550 { 1551 struct in6_aliasreq ifra; 1552 struct in6_addr *xhostid = NULL; 1553 int prefixlen; 1554 int bound = curlwp_bind(); 1555 struct psref psref; 1556 1557 if ((iflr->flags & IFLR_PREFIX) != 0) { 1558 struct sockaddr_in6 *sin6; 1559 1560 /* 1561 * xhostid is to fill in the hostid part of the 1562 * address. xhostid points to the first link-local 1563 * address attached to the interface. 1564 */ 1565 ia = in6ifa_ifpforlinklocal_psref(ifp, 0, &psref); 1566 if (ia == NULL) { 1567 curlwp_bindx(bound); 1568 return EADDRNOTAVAIL; 1569 } 1570 xhostid = IFA_IN6(&ia->ia_ifa); 1571 1572 /* prefixlen must be <= 64. */ 1573 if (64 < iflr->prefixlen) { 1574 ia6_release(ia, &psref); 1575 curlwp_bindx(bound); 1576 return EINVAL; 1577 } 1578 prefixlen = iflr->prefixlen; 1579 1580 /* hostid part must be zero. */ 1581 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1582 if (sin6->sin6_addr.s6_addr32[2] != 0 1583 || sin6->sin6_addr.s6_addr32[3] != 0) { 1584 ia6_release(ia, &psref); 1585 curlwp_bindx(bound); 1586 return EINVAL; 1587 } 1588 } else 1589 prefixlen = iflr->prefixlen; 1590 1591 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1592 memset(&ifra, 0, sizeof(ifra)); 1593 memcpy(ifra.ifra_name, iflr->iflr_name, sizeof(ifra.ifra_name)); 1594 1595 memcpy(&ifra.ifra_addr, &iflr->addr, 1596 ((struct sockaddr *)&iflr->addr)->sa_len); 1597 if (xhostid) { 1598 /* fill in hostid part */ 1599 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1600 xhostid->s6_addr32[2]; 1601 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1602 xhostid->s6_addr32[3]; 1603 } 1604 1605 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1606 memcpy(&ifra.ifra_dstaddr, &iflr->dstaddr, 1607 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1608 if (xhostid) { 1609 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1610 xhostid->s6_addr32[2]; 1611 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1612 xhostid->s6_addr32[3]; 1613 } 1614 } 1615 if (xhostid) { 1616 ia6_release(ia, &psref); 1617 ia = NULL; 1618 } 1619 curlwp_bindx(bound); 1620 1621 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1622 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1623 1624 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 1625 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 1626 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1627 return in6_control(so, SIOCAIFADDR_IN6, &ifra, ifp); 1628 } 1629 case SIOCGLIFADDR: 1630 case SIOCDLIFADDR: 1631 { 1632 struct in6_addr mask, candidate, match; 1633 struct sockaddr_in6 *sin6; 1634 int cmp; 1635 int error, s; 1636 1637 memset(&mask, 0, sizeof(mask)); 1638 if (iflr->flags & IFLR_PREFIX) { 1639 /* lookup a prefix rather than address. */ 1640 in6_prefixlen2mask(&mask, iflr->prefixlen); 1641 1642 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1643 memcpy(&match, &sin6->sin6_addr, sizeof(match)); 1644 match.s6_addr32[0] &= mask.s6_addr32[0]; 1645 match.s6_addr32[1] &= mask.s6_addr32[1]; 1646 match.s6_addr32[2] &= mask.s6_addr32[2]; 1647 match.s6_addr32[3] &= mask.s6_addr32[3]; 1648 1649 /* if you set extra bits, that's wrong */ 1650 if (memcmp(&match, &sin6->sin6_addr, sizeof(match))) 1651 return EINVAL; 1652 1653 cmp = 1; 1654 } else { 1655 if (cmd == SIOCGLIFADDR) { 1656 /* on getting an address, take the 1st match */ 1657 cmp = 0; /* XXX */ 1658 } else { 1659 /* on deleting an address, do exact match */ 1660 in6_prefixlen2mask(&mask, 128); 1661 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1662 memcpy(&match, &sin6->sin6_addr, sizeof(match)); 1663 1664 cmp = 1; 1665 } 1666 } 1667 1668 s = pserialize_read_enter(); 1669 IFADDR_READER_FOREACH(ifa, ifp) { 1670 if (ifa->ifa_addr->sa_family != AF_INET6) 1671 continue; 1672 if (!cmp) 1673 break; 1674 1675 /* 1676 * XXX: this is adhoc, but is necessary to allow 1677 * a user to specify fe80::/64 (not /10) for a 1678 * link-local address. 1679 */ 1680 memcpy(&candidate, IFA_IN6(ifa), sizeof(candidate)); 1681 in6_clearscope(&candidate); 1682 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1683 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1684 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1685 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1686 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1687 break; 1688 } 1689 if (!ifa) { 1690 error = EADDRNOTAVAIL; 1691 goto error; 1692 } 1693 ia = ifa2ia6(ifa); 1694 1695 if (cmd == SIOCGLIFADDR) { 1696 /* fill in the if_laddrreq structure */ 1697 memcpy(&iflr->addr, &ia->ia_addr, ia->ia_addr.sin6_len); 1698 error = sa6_recoverscope( 1699 (struct sockaddr_in6 *)&iflr->addr); 1700 if (error != 0) 1701 goto error; 1702 1703 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1704 memcpy(&iflr->dstaddr, &ia->ia_dstaddr, 1705 ia->ia_dstaddr.sin6_len); 1706 error = sa6_recoverscope( 1707 (struct sockaddr_in6 *)&iflr->dstaddr); 1708 if (error != 0) 1709 goto error; 1710 } else 1711 memset(&iflr->dstaddr, 0, sizeof(iflr->dstaddr)); 1712 1713 iflr->prefixlen = 1714 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1715 1716 iflr->flags = ia->ia6_flags; /* XXX */ 1717 1718 error = 0; 1719 } else { 1720 struct in6_aliasreq ifra; 1721 1722 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1723 memset(&ifra, 0, sizeof(ifra)); 1724 memcpy(ifra.ifra_name, iflr->iflr_name, 1725 sizeof(ifra.ifra_name)); 1726 1727 memcpy(&ifra.ifra_addr, &ia->ia_addr, 1728 ia->ia_addr.sin6_len); 1729 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1730 memcpy(&ifra.ifra_dstaddr, &ia->ia_dstaddr, 1731 ia->ia_dstaddr.sin6_len); 1732 } else { 1733 memset(&ifra.ifra_dstaddr, 0, 1734 sizeof(ifra.ifra_dstaddr)); 1735 } 1736 memcpy(&ifra.ifra_dstaddr, &ia->ia_prefixmask, 1737 ia->ia_prefixmask.sin6_len); 1738 1739 ifra.ifra_flags = ia->ia6_flags; 1740 pserialize_read_exit(s); 1741 1742 return in6_control(so, SIOCDIFADDR_IN6, &ifra, ifp); 1743 } 1744 error: 1745 pserialize_read_exit(s); 1746 return error; 1747 } 1748 } 1749 1750 return EOPNOTSUPP; /* just for safety */ 1751 } 1752 1753 /* 1754 * Initialize an interface's internet6 address 1755 * and routing table entry. 1756 */ 1757 static int 1758 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1759 const struct sockaddr_in6 *sin6, int newhost) 1760 { 1761 int error = 0, ifacount = 0; 1762 int s = splsoftnet(); 1763 struct ifaddr *ifa; 1764 1765 /* 1766 * Give the interface a chance to initialize 1767 * if this is its first address, 1768 * and to validate the address if necessary. 1769 */ 1770 IFADDR_READER_FOREACH(ifa, ifp) { 1771 if (ifa->ifa_addr->sa_family != AF_INET6) 1772 continue; 1773 ifacount++; 1774 } 1775 1776 ia->ia_addr = *sin6; 1777 1778 if (ifacount <= 0 && 1779 (error = if_addr_init(ifp, &ia->ia_ifa, true)) != 0) { 1780 splx(s); 1781 return error; 1782 } 1783 splx(s); 1784 1785 ia->ia_ifa.ifa_metric = ifp->if_metric; 1786 1787 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1788 1789 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1790 if (newhost) { 1791 /* set the rtrequest function to create llinfo */ 1792 if (ifp->if_flags & IFF_POINTOPOINT) 1793 ia->ia_ifa.ifa_rtrequest = p2p_rtrequest; 1794 else if ((ifp->if_flags & IFF_LOOPBACK) == 0) 1795 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1796 in6_ifaddlocal(&ia->ia_ifa); 1797 } else { 1798 /* Inform the routing socket of new flags/timings */ 1799 rt_newaddrmsg(RTM_NEWADDR, &ia->ia_ifa, 0, NULL); 1800 } 1801 1802 /* Add the network prefix route. */ 1803 if ((error = in6_ifaddprefix(ia)) != 0) { 1804 if (newhost) 1805 in6_ifremlocal(&ia->ia_ifa); 1806 return error; 1807 } 1808 1809 return error; 1810 } 1811 1812 static struct ifaddr * 1813 bestifa(struct ifaddr *best_ifa, struct ifaddr *ifa) 1814 { 1815 if (best_ifa == NULL || best_ifa->ifa_preference < ifa->ifa_preference) 1816 return ifa; 1817 return best_ifa; 1818 } 1819 1820 /* 1821 * Find an IPv6 interface link-local address specific to an interface. 1822 */ 1823 struct in6_ifaddr * 1824 in6ifa_ifpforlinklocal(const struct ifnet *ifp, const int ignoreflags) 1825 { 1826 struct ifaddr *best_ifa = NULL, *ifa; 1827 1828 IFADDR_READER_FOREACH(ifa, ifp) { 1829 if (ifa->ifa_addr->sa_family != AF_INET6) 1830 continue; 1831 if (!IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) 1832 continue; 1833 if ((((struct in6_ifaddr *)ifa)->ia6_flags & ignoreflags) != 0) 1834 continue; 1835 best_ifa = bestifa(best_ifa, ifa); 1836 } 1837 1838 return (struct in6_ifaddr *)best_ifa; 1839 } 1840 1841 struct in6_ifaddr * 1842 in6ifa_ifpforlinklocal_psref(const struct ifnet *ifp, const int ignoreflags, 1843 struct psref *psref) 1844 { 1845 struct in6_ifaddr *ia; 1846 int s = pserialize_read_enter(); 1847 1848 ia = in6ifa_ifpforlinklocal(ifp, ignoreflags); 1849 if (ia != NULL) 1850 ia6_acquire(ia, psref); 1851 pserialize_read_exit(s); 1852 1853 return ia; 1854 } 1855 1856 /* 1857 * find the internet address corresponding to a given address. 1858 * ifaddr is returned referenced. 1859 */ 1860 struct in6_ifaddr * 1861 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid) 1862 { 1863 struct in6_ifaddr *ia; 1864 int s; 1865 1866 s = pserialize_read_enter(); 1867 IN6_ADDRLIST_READER_FOREACH(ia) { 1868 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1869 if (zoneid != 0 && 1870 zoneid != ia->ia_addr.sin6_scope_id) 1871 continue; 1872 ifaref(&ia->ia_ifa); 1873 break; 1874 } 1875 } 1876 pserialize_read_exit(s); 1877 1878 return ia; 1879 } 1880 1881 /* 1882 * find the internet address corresponding to a given interface and address. 1883 */ 1884 struct in6_ifaddr * 1885 in6ifa_ifpwithaddr(const struct ifnet *ifp, const struct in6_addr *addr) 1886 { 1887 struct ifaddr *best_ifa = NULL, *ifa; 1888 1889 IFADDR_READER_FOREACH(ifa, ifp) { 1890 if (ifa->ifa_addr->sa_family != AF_INET6) 1891 continue; 1892 if (!IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1893 continue; 1894 best_ifa = bestifa(best_ifa, ifa); 1895 } 1896 1897 return (struct in6_ifaddr *)best_ifa; 1898 } 1899 1900 struct in6_ifaddr * 1901 in6ifa_ifpwithaddr_psref(const struct ifnet *ifp, const struct in6_addr *addr, 1902 struct psref *psref) 1903 { 1904 struct in6_ifaddr *ia; 1905 int s = pserialize_read_enter(); 1906 1907 ia = in6ifa_ifpwithaddr(ifp, addr); 1908 if (ia != NULL) 1909 ia6_acquire(ia, psref); 1910 pserialize_read_exit(s); 1911 1912 return ia; 1913 } 1914 1915 static struct in6_ifaddr * 1916 bestia(struct in6_ifaddr *best_ia, struct in6_ifaddr *ia) 1917 { 1918 if (best_ia == NULL || 1919 best_ia->ia_ifa.ifa_preference < ia->ia_ifa.ifa_preference) 1920 return ia; 1921 return best_ia; 1922 } 1923 1924 /* 1925 * Determine if an address is on a local network. 1926 */ 1927 int 1928 in6_localaddr(const struct in6_addr *in6) 1929 { 1930 struct in6_ifaddr *ia; 1931 int s; 1932 1933 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1934 return 1; 1935 1936 s = pserialize_read_enter(); 1937 IN6_ADDRLIST_READER_FOREACH(ia) { 1938 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1939 &ia->ia_prefixmask.sin6_addr)) { 1940 pserialize_read_exit(s); 1941 return 1; 1942 } 1943 } 1944 pserialize_read_exit(s); 1945 1946 return 0; 1947 } 1948 1949 int 1950 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1951 { 1952 struct in6_ifaddr *ia; 1953 int s; 1954 1955 s = pserialize_read_enter(); 1956 IN6_ADDRLIST_READER_FOREACH(ia) { 1957 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1958 &sa6->sin6_addr) && 1959 #ifdef SCOPEDROUTING 1960 ia->ia_addr.sin6_scope_id == sa6->sin6_scope_id && 1961 #endif 1962 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) { 1963 pserialize_read_exit(s); 1964 return 1; /* true */ 1965 } 1966 1967 /* XXX: do we still have to go thru the rest of the list? */ 1968 } 1969 pserialize_read_exit(s); 1970 1971 return 0; /* false */ 1972 } 1973 1974 /* 1975 * return length of part which dst and src are equal 1976 * hard coding... 1977 */ 1978 int 1979 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1980 { 1981 int match = 0; 1982 u_char *s = (u_char *)src, *d = (u_char *)dst; 1983 u_char *lim = s + 16, r; 1984 1985 while (s < lim) 1986 if ((r = (*d++ ^ *s++)) != 0) { 1987 while (r < 128) { 1988 match++; 1989 r <<= 1; 1990 } 1991 break; 1992 } else 1993 match += NBBY; 1994 return match; 1995 } 1996 1997 /* XXX: to be scope conscious */ 1998 int 1999 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 2000 { 2001 int bytelen, bitlen; 2002 2003 /* sanity check */ 2004 if (len < 0 || len > 128) { 2005 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 2006 len); 2007 return 0; 2008 } 2009 2010 bytelen = len / NBBY; 2011 bitlen = len % NBBY; 2012 2013 if (memcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 2014 return 0; 2015 if (bitlen != 0 && 2016 p1->s6_addr[bytelen] >> (NBBY - bitlen) != 2017 p2->s6_addr[bytelen] >> (NBBY - bitlen)) 2018 return 0; 2019 2020 return 1; 2021 } 2022 2023 void 2024 in6_prefixlen2mask(struct in6_addr *maskp, int len) 2025 { 2026 static const u_char maskarray[NBBY] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 2027 int bytelen, bitlen, i; 2028 2029 /* sanity check */ 2030 if (len < 0 || len > 128) { 2031 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 2032 len); 2033 return; 2034 } 2035 2036 memset(maskp, 0, sizeof(*maskp)); 2037 bytelen = len / NBBY; 2038 bitlen = len % NBBY; 2039 for (i = 0; i < bytelen; i++) 2040 maskp->s6_addr[i] = 0xff; 2041 if (bitlen) 2042 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 2043 } 2044 2045 /* 2046 * return the best address out of the same scope. if no address was 2047 * found, return the first valid address from designated IF. 2048 */ 2049 struct in6_ifaddr * 2050 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2051 { 2052 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2053 struct ifaddr *ifa; 2054 struct in6_ifaddr *best_ia = NULL, *ia; 2055 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2056 2057 dep[0] = dep[1] = NULL; 2058 2059 /* 2060 * We first look for addresses in the same scope. 2061 * If there is one, return it. 2062 * If two or more, return one which matches the dst longest. 2063 * If none, return one of global addresses assigned other ifs. 2064 */ 2065 IFADDR_READER_FOREACH(ifa, ifp) { 2066 if (ifa->ifa_addr->sa_family != AF_INET6) 2067 continue; 2068 ia = (struct in6_ifaddr *)ifa; 2069 if (ia->ia6_flags & IN6_IFF_ANYCAST) 2070 continue; /* XXX: is there any case to allow anycast? */ 2071 if (ia->ia6_flags & IN6_IFF_NOTREADY) 2072 continue; /* don't use this interface */ 2073 if (ia->ia6_flags & IN6_IFF_DETACHED) 2074 continue; 2075 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2076 if (ip6_use_deprecated) 2077 dep[0] = ia; 2078 continue; 2079 } 2080 2081 if (dst_scope != in6_addrscope(IFA_IN6(ifa))) 2082 continue; 2083 /* 2084 * call in6_matchlen() as few as possible 2085 */ 2086 if (best_ia == NULL) { 2087 best_ia = ia; 2088 continue; 2089 } 2090 if (blen == -1) 2091 blen = in6_matchlen(&best_ia->ia_addr.sin6_addr, dst); 2092 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2093 if (tlen > blen) { 2094 blen = tlen; 2095 best_ia = ia; 2096 } else if (tlen == blen) 2097 best_ia = bestia(best_ia, ia); 2098 } 2099 if (best_ia != NULL) 2100 return best_ia; 2101 2102 IFADDR_READER_FOREACH(ifa, ifp) { 2103 if (ifa->ifa_addr->sa_family != AF_INET6) 2104 continue; 2105 ia = (struct in6_ifaddr *)ifa; 2106 if (ia->ia6_flags & IN6_IFF_ANYCAST) 2107 continue; /* XXX: is there any case to allow anycast? */ 2108 if (ia->ia6_flags & IN6_IFF_NOTREADY) 2109 continue; /* don't use this interface */ 2110 if (ia->ia6_flags & IN6_IFF_DETACHED) 2111 continue; 2112 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2113 if (ip6_use_deprecated) 2114 dep[1] = (struct in6_ifaddr *)ifa; 2115 continue; 2116 } 2117 2118 best_ia = bestia(best_ia, ia); 2119 } 2120 if (best_ia != NULL) 2121 return best_ia; 2122 2123 /* use the last-resort values, that are, deprecated addresses */ 2124 if (dep[0]) 2125 return dep[0]; 2126 if (dep[1]) 2127 return dep[1]; 2128 2129 return NULL; 2130 } 2131 2132 /* 2133 * perform DAD when interface becomes IFF_UP. 2134 */ 2135 void 2136 in6_if_link_up(struct ifnet *ifp) 2137 { 2138 struct ifaddr *ifa; 2139 struct in6_ifaddr *ia; 2140 int s, bound; 2141 char ip6buf[INET6_ADDRSTRLEN]; 2142 2143 /* Ensure it's sane to run DAD */ 2144 if (ifp->if_link_state == LINK_STATE_DOWN) 2145 return; 2146 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 2147 return; 2148 2149 bound = curlwp_bind(); 2150 s = pserialize_read_enter(); 2151 IFADDR_READER_FOREACH(ifa, ifp) { 2152 struct psref psref; 2153 2154 if (ifa->ifa_addr->sa_family != AF_INET6) 2155 continue; 2156 2157 ifa_acquire(ifa, &psref); 2158 pserialize_read_exit(s); 2159 ia = (struct in6_ifaddr *)ifa; 2160 2161 /* If detached then mark as tentative */ 2162 if (ia->ia6_flags & IN6_IFF_DETACHED) { 2163 ia->ia6_flags &= ~IN6_IFF_DETACHED; 2164 if (if_do_dad(ifp)) { 2165 ia->ia6_flags |= IN6_IFF_TENTATIVE; 2166 nd6log(LOG_ERR, "%s marked tentative\n", 2167 IN6_PRINT(ip6buf, 2168 &ia->ia_addr.sin6_addr)); 2169 } else if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) 2170 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 2171 } 2172 2173 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2174 int rand_delay; 2175 2176 /* Clear the duplicated flag as we're starting DAD. */ 2177 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; 2178 2179 /* 2180 * The TENTATIVE flag was likely set by hand 2181 * beforehand, implicitly indicating the need for DAD. 2182 * We may be able to skip the random delay in this 2183 * case, but we impose delays just in case. 2184 */ 2185 rand_delay = cprng_fast32() % 2186 (MAX_RTR_SOLICITATION_DELAY * hz); 2187 /* +1 ensures callout is always used */ 2188 nd6_dad_start(ifa, rand_delay + 1); 2189 } 2190 2191 s = pserialize_read_enter(); 2192 ifa_release(ifa, &psref); 2193 } 2194 pserialize_read_exit(s); 2195 curlwp_bindx(bound); 2196 2197 /* Restore any detached prefixes */ 2198 ND6_WLOCK(); 2199 nd6_pfxlist_onlink_check(); 2200 ND6_UNLOCK(); 2201 } 2202 2203 void 2204 in6_if_up(struct ifnet *ifp) 2205 { 2206 2207 /* 2208 * special cases, like 6to4, are handled in in6_ifattach 2209 */ 2210 in6_ifattach(ifp, NULL); 2211 2212 /* interface may not support link state, so bring it up also */ 2213 in6_if_link_up(ifp); 2214 } 2215 2216 /* 2217 * Mark all addresses as detached. 2218 */ 2219 void 2220 in6_if_link_down(struct ifnet *ifp) 2221 { 2222 struct ifaddr *ifa; 2223 struct in6_ifaddr *ia; 2224 int s, bound; 2225 char ip6buf[INET6_ADDRSTRLEN]; 2226 2227 /* Any prefixes on this interface should be detached as well */ 2228 ND6_WLOCK(); 2229 nd6_pfxlist_onlink_check(); 2230 ND6_UNLOCK(); 2231 2232 bound = curlwp_bind(); 2233 s = pserialize_read_enter(); 2234 IFADDR_READER_FOREACH(ifa, ifp) { 2235 struct psref psref; 2236 2237 if (ifa->ifa_addr->sa_family != AF_INET6) 2238 continue; 2239 2240 ifa_acquire(ifa, &psref); 2241 pserialize_read_exit(s); 2242 ia = (struct in6_ifaddr *)ifa; 2243 2244 /* Stop DAD processing */ 2245 nd6_dad_stop(ifa); 2246 2247 /* 2248 * Mark the address as detached. 2249 * This satisfies RFC4862 Section 5.3, but we should apply 2250 * this logic to all addresses to be a good citizen and 2251 * avoid potential duplicated addresses. 2252 * When the interface comes up again, detached addresses 2253 * are marked tentative and DAD commences. 2254 */ 2255 if (!(ia->ia6_flags & IN6_IFF_DETACHED)) { 2256 nd6log(LOG_DEBUG, "%s marked detached\n", 2257 IN6_PRINT(ip6buf, &ia->ia_addr.sin6_addr)); 2258 ia->ia6_flags |= IN6_IFF_DETACHED; 2259 ia->ia6_flags &= 2260 ~(IN6_IFF_TENTATIVE | IN6_IFF_DUPLICATED); 2261 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 2262 } 2263 2264 s = pserialize_read_enter(); 2265 ifa_release(ifa, &psref); 2266 } 2267 pserialize_read_exit(s); 2268 curlwp_bindx(bound); 2269 } 2270 2271 void 2272 in6_if_down(struct ifnet *ifp) 2273 { 2274 2275 in6_if_link_down(ifp); 2276 } 2277 2278 void 2279 in6_if_link_state_change(struct ifnet *ifp, int link_state) 2280 { 2281 2282 switch (link_state) { 2283 case LINK_STATE_DOWN: 2284 in6_if_link_down(ifp); 2285 break; 2286 case LINK_STATE_UP: 2287 in6_if_link_up(ifp); 2288 break; 2289 } 2290 } 2291 2292 /* 2293 * Calculate max IPv6 MTU through all the interfaces and store it 2294 * to in6_maxmtu. 2295 */ 2296 void 2297 in6_setmaxmtu(void) 2298 { 2299 unsigned long maxmtu = 0; 2300 struct ifnet *ifp; 2301 int s; 2302 2303 s = pserialize_read_enter(); 2304 IFNET_READER_FOREACH(ifp) { 2305 /* this function can be called during ifnet initialization */ 2306 if (!ifp->if_afdata[AF_INET6]) 2307 continue; 2308 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2309 IN6_LINKMTU(ifp) > maxmtu) 2310 maxmtu = IN6_LINKMTU(ifp); 2311 } 2312 pserialize_read_exit(s); 2313 if (maxmtu) /* update only when maxmtu is positive */ 2314 in6_maxmtu = maxmtu; 2315 } 2316 2317 /* 2318 * Provide the length of interface identifiers to be used for the link attached 2319 * to the given interface. The length should be defined in "IPv6 over 2320 * xxx-link" document. Note that address architecture might also define 2321 * the length for a particular set of address prefixes, regardless of the 2322 * link type. As clarified in rfc2462bis, those two definitions should be 2323 * consistent, and those really are as of August 2004. 2324 */ 2325 int 2326 in6_if2idlen(struct ifnet *ifp) 2327 { 2328 switch (ifp->if_type) { 2329 case IFT_ETHER: /* RFC2464 */ 2330 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2331 case IFT_L2VLAN: /* ditto */ 2332 case IFT_IEEE80211: /* ditto */ 2333 case IFT_FDDI: /* RFC2467 */ 2334 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 2335 case IFT_PPP: /* RFC2472 */ 2336 case IFT_ARCNET: /* RFC2497 */ 2337 case IFT_FRELAY: /* RFC2590 */ 2338 case IFT_IEEE1394: /* RFC3146 */ 2339 case IFT_GIF: /* draft-ietf-v6ops-mech-v2-07 */ 2340 case IFT_LOOP: /* XXX: is this really correct? */ 2341 return 64; 2342 default: 2343 /* 2344 * Unknown link type: 2345 * It might be controversial to use the today's common constant 2346 * of 64 for these cases unconditionally. For full compliance, 2347 * we should return an error in this case. On the other hand, 2348 * if we simply miss the standard for the link type or a new 2349 * standard is defined for a new link type, the IFID length 2350 * is very likely to be the common constant. As a compromise, 2351 * we always use the constant, but make an explicit notice 2352 * indicating the "unknown" case. 2353 */ 2354 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2355 return 64; 2356 } 2357 } 2358 2359 struct in6_llentry { 2360 struct llentry base; 2361 }; 2362 2363 #define IN6_LLTBL_DEFAULT_HSIZE 32 2364 #define IN6_LLTBL_HASH(k, h) \ 2365 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 2366 2367 /* 2368 * Do actual deallocation of @lle. 2369 * Called by LLE_FREE_LOCKED when number of references 2370 * drops to zero. 2371 */ 2372 static void 2373 in6_lltable_destroy_lle(struct llentry *lle) 2374 { 2375 2376 LLE_WUNLOCK(lle); 2377 LLE_LOCK_DESTROY(lle); 2378 kmem_intr_free(lle, sizeof(struct in6_llentry)); 2379 } 2380 2381 static struct llentry * 2382 in6_lltable_new(const struct in6_addr *addr6, u_int flags) 2383 { 2384 struct in6_llentry *lle; 2385 2386 lle = kmem_intr_zalloc(sizeof(struct in6_llentry), KM_NOSLEEP); 2387 if (lle == NULL) /* NB: caller generates msg */ 2388 return NULL; 2389 2390 lle->base.r_l3addr.addr6 = *addr6; 2391 lle->base.lle_refcnt = 1; 2392 lle->base.lle_free = in6_lltable_destroy_lle; 2393 LLE_LOCK_INIT(&lle->base); 2394 callout_init(&lle->base.lle_timer, CALLOUT_MPSAFE); 2395 2396 return &lle->base; 2397 } 2398 2399 static int 2400 in6_lltable_match_prefix(const struct sockaddr *prefix, 2401 const struct sockaddr *mask, u_int flags, struct llentry *lle) 2402 { 2403 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix; 2404 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask; 2405 2406 if (IN6_ARE_MASKED_ADDR_EQUAL(&lle->r_l3addr.addr6, 2407 &pfx->sin6_addr, &msk->sin6_addr) && 2408 ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) 2409 return 1; 2410 2411 return 0; 2412 } 2413 2414 static void 2415 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle) 2416 { 2417 struct ifnet *ifp = llt->llt_ifp; 2418 2419 IF_AFDATA_WLOCK_ASSERT(ifp); 2420 LLE_WLOCK_ASSERT(lle); 2421 2422 /* Unlink entry from table */ 2423 if ((lle->la_flags & LLE_LINKED) != 0) { 2424 2425 lltable_unlink_entry(llt, lle); 2426 KASSERT((lle->la_flags & LLE_LINKED) == 0); 2427 } 2428 /* 2429 * We need to release the lock here to lle_timer proceeds; 2430 * lle_timer should stop immediately if LLE_LINKED isn't set. 2431 * Note that we cannot pass lle->lle_lock to callout_halt 2432 * because it's a rwlock. 2433 */ 2434 LLE_ADDREF(lle); 2435 LLE_WUNLOCK(lle); 2436 IF_AFDATA_WUNLOCK(ifp); 2437 2438 #ifdef NET_MPSAFE 2439 callout_halt(&lle->lle_timer, NULL); 2440 #else 2441 if (mutex_owned(softnet_lock)) 2442 callout_halt(&lle->lle_timer, softnet_lock); 2443 else 2444 callout_halt(&lle->lle_timer, NULL); 2445 #endif 2446 LLE_WLOCK(lle); 2447 LLE_REMREF(lle); 2448 2449 lltable_drop_entry_queue(lle); 2450 LLE_FREE_LOCKED(lle); 2451 2452 IF_AFDATA_WLOCK(ifp); 2453 } 2454 2455 static int 2456 in6_lltable_rtcheck(struct ifnet *ifp, 2457 u_int flags, 2458 const struct sockaddr *l3addr) 2459 { 2460 struct rtentry *rt; 2461 char ip6buf[INET6_ADDRSTRLEN]; 2462 2463 KASSERTMSG(l3addr->sa_family == AF_INET6, 2464 "sin_family %d", l3addr->sa_family); 2465 2466 rt = rtalloc1(l3addr, 0); 2467 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 2468 int s; 2469 struct ifaddr *ifa; 2470 /* 2471 * Create an ND6 cache for an IPv6 neighbor 2472 * that is not covered by our own prefix. 2473 */ 2474 /* XXX ifaof_ifpforaddr should take a const param */ 2475 s = pserialize_read_enter(); 2476 ifa = ifaof_ifpforaddr(l3addr, ifp); 2477 if (ifa != NULL) { 2478 pserialize_read_exit(s); 2479 if (rt != NULL) 2480 rt_unref(rt); 2481 return 0; 2482 } 2483 pserialize_read_exit(s); 2484 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2485 IN6_PRINT(ip6buf, 2486 &((const struct sockaddr_in6 *)l3addr)->sin6_addr)); 2487 if (rt != NULL) 2488 rt_unref(rt); 2489 return EINVAL; 2490 } 2491 rt_unref(rt); 2492 return 0; 2493 } 2494 2495 static inline uint32_t 2496 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize) 2497 { 2498 2499 return IN6_LLTBL_HASH(dst->s6_addr32[3], hsize); 2500 } 2501 2502 static uint32_t 2503 in6_lltable_hash(const struct llentry *lle, uint32_t hsize) 2504 { 2505 2506 return in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize); 2507 } 2508 2509 static void 2510 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 2511 { 2512 struct sockaddr_in6 *sin6; 2513 2514 sin6 = (struct sockaddr_in6 *)sa; 2515 bzero(sin6, sizeof(*sin6)); 2516 sin6->sin6_family = AF_INET6; 2517 sin6->sin6_len = sizeof(*sin6); 2518 sin6->sin6_addr = lle->r_l3addr.addr6; 2519 } 2520 2521 static inline struct llentry * 2522 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst) 2523 { 2524 struct llentry *lle; 2525 struct llentries *lleh; 2526 u_int hashidx; 2527 2528 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize); 2529 lleh = &llt->lle_head[hashidx]; 2530 LIST_FOREACH(lle, lleh, lle_next) { 2531 if (lle->la_flags & LLE_DELETED) 2532 continue; 2533 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst)) 2534 break; 2535 } 2536 2537 return lle; 2538 } 2539 2540 static int 2541 in6_lltable_delete(struct lltable *llt, u_int flags, 2542 const struct sockaddr *l3addr) 2543 { 2544 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2545 struct llentry *lle; 2546 2547 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp); 2548 KASSERTMSG(l3addr->sa_family == AF_INET6, 2549 "sin_family %d", l3addr->sa_family); 2550 2551 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2552 2553 if (lle == NULL) { 2554 #ifdef DEBUG 2555 char buf[64]; 2556 sockaddr_format(l3addr, buf, sizeof(buf)); 2557 log(LOG_INFO, "%s: cache for %s is not found\n", 2558 __func__, buf); 2559 #endif 2560 return ENOENT; 2561 } 2562 2563 LLE_WLOCK(lle); 2564 lle->la_flags |= LLE_DELETED; 2565 #ifdef DEBUG 2566 { 2567 char buf[64]; 2568 sockaddr_format(l3addr, buf, sizeof(buf)); 2569 log(LOG_INFO, "%s: cache for %s (%p) is deleted\n", 2570 __func__, buf, lle); 2571 } 2572 #endif 2573 if ((lle->la_flags & (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC) 2574 llentry_free(lle); 2575 else 2576 LLE_WUNLOCK(lle); 2577 2578 return 0; 2579 } 2580 2581 static struct llentry * 2582 in6_lltable_create(struct lltable *llt, u_int flags, 2583 const struct sockaddr *l3addr) 2584 { 2585 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2586 struct ifnet *ifp = llt->llt_ifp; 2587 struct llentry *lle; 2588 2589 IF_AFDATA_WLOCK_ASSERT(ifp); 2590 KASSERTMSG(l3addr->sa_family == AF_INET6, 2591 "sin_family %d", l3addr->sa_family); 2592 2593 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2594 2595 if (lle != NULL) { 2596 LLE_WLOCK(lle); 2597 return lle; 2598 } 2599 2600 /* 2601 * A route that covers the given address must have 2602 * been installed 1st because we are doing a resolution, 2603 * verify this. 2604 */ 2605 if (!(flags & LLE_IFADDR) && 2606 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2607 return NULL; 2608 2609 lle = in6_lltable_new(&sin6->sin6_addr, flags); 2610 if (lle == NULL) { 2611 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2612 return NULL; 2613 } 2614 lle->la_flags = flags; 2615 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 2616 memcpy(&lle->ll_addr, CLLADDR(ifp->if_sadl), ifp->if_addrlen); 2617 lle->la_flags |= LLE_VALID; 2618 } 2619 2620 lltable_link_entry(llt, lle); 2621 LLE_WLOCK(lle); 2622 2623 return lle; 2624 } 2625 2626 static struct llentry * 2627 in6_lltable_lookup(struct lltable *llt, u_int flags, 2628 const struct sockaddr *l3addr) 2629 { 2630 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2631 struct llentry *lle; 2632 2633 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 2634 KASSERTMSG(l3addr->sa_family == AF_INET6, 2635 "sin_family %d", l3addr->sa_family); 2636 2637 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2638 2639 if (lle == NULL) 2640 return NULL; 2641 2642 if (flags & LLE_EXCLUSIVE) 2643 LLE_WLOCK(lle); 2644 else 2645 LLE_RLOCK(lle); 2646 return lle; 2647 } 2648 2649 static int 2650 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 2651 struct rt_walkarg *w) 2652 { 2653 struct sockaddr_in6 sin6; 2654 2655 LLTABLE_LOCK_ASSERT(); 2656 2657 /* skip deleted entries */ 2658 if (lle->la_flags & LLE_DELETED) 2659 return 0; 2660 2661 sockaddr_in6_init(&sin6, &lle->r_l3addr.addr6, 0, 0, 0); 2662 2663 return lltable_dump_entry(llt, lle, w, sin6tosa(&sin6)); 2664 } 2665 2666 static struct lltable * 2667 in6_lltattach(struct ifnet *ifp) 2668 { 2669 struct lltable *llt; 2670 2671 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE); 2672 llt->llt_af = AF_INET6; 2673 llt->llt_ifp = ifp; 2674 2675 llt->llt_lookup = in6_lltable_lookup; 2676 llt->llt_create = in6_lltable_create; 2677 llt->llt_delete = in6_lltable_delete; 2678 llt->llt_dump_entry = in6_lltable_dump_entry; 2679 llt->llt_hash = in6_lltable_hash; 2680 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry; 2681 llt->llt_free_entry = in6_lltable_free_entry; 2682 llt->llt_match_prefix = in6_lltable_match_prefix; 2683 lltable_link(llt); 2684 2685 return llt; 2686 } 2687 2688 void * 2689 in6_domifattach(struct ifnet *ifp) 2690 { 2691 struct in6_ifextra *ext; 2692 2693 ext = malloc(sizeof(*ext), M_IFADDR, M_WAITOK|M_ZERO); 2694 2695 ext->in6_ifstat = malloc(sizeof(struct in6_ifstat), 2696 M_IFADDR, M_WAITOK|M_ZERO); 2697 2698 ext->icmp6_ifstat = malloc(sizeof(struct icmp6_ifstat), 2699 M_IFADDR, M_WAITOK|M_ZERO); 2700 2701 ext->nd_ifinfo = nd6_ifattach(ifp); 2702 ext->scope6_id = scope6_ifattach(ifp); 2703 ext->nprefixes = 0; 2704 ext->ndefrouters = 0; 2705 2706 ext->lltable = in6_lltattach(ifp); 2707 2708 return ext; 2709 } 2710 2711 void 2712 in6_domifdetach(struct ifnet *ifp, void *aux) 2713 { 2714 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2715 2716 lltable_free(ext->lltable); 2717 ext->lltable = NULL; 2718 #ifndef NET_MPSAFE 2719 mutex_enter(softnet_lock); 2720 #endif 2721 nd6_ifdetach(ifp, ext); 2722 #ifndef NET_MPSAFE 2723 mutex_exit(softnet_lock); 2724 #endif 2725 free(ext->in6_ifstat, M_IFADDR); 2726 free(ext->icmp6_ifstat, M_IFADDR); 2727 scope6_ifdetach(ext->scope6_id); 2728 free(ext, M_IFADDR); 2729 } 2730 2731 /* 2732 * Convert IPv4 address stored in struct in_addr to IPv4-Mapped IPv6 address 2733 * stored in struct in6_addr as defined in RFC 4921 section 2.5.5.2. 2734 */ 2735 void 2736 in6_in_2_v4mapin6(const struct in_addr *in, struct in6_addr *in6) 2737 { 2738 in6->s6_addr32[0] = 0; 2739 in6->s6_addr32[1] = 0; 2740 in6->s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2741 in6->s6_addr32[3] = in->s_addr; 2742 } 2743 2744 /* 2745 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2746 * v4 mapped addr or v4 compat addr 2747 */ 2748 void 2749 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2750 { 2751 memset(sin, 0, sizeof(*sin)); 2752 sin->sin_len = sizeof(struct sockaddr_in); 2753 sin->sin_family = AF_INET; 2754 sin->sin_port = sin6->sin6_port; 2755 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2756 } 2757 2758 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2759 void 2760 in6_sin_2_v4mapsin6(const struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2761 { 2762 memset(sin6, 0, sizeof(*sin6)); 2763 sin6->sin6_len = sizeof(struct sockaddr_in6); 2764 sin6->sin6_family = AF_INET6; 2765 sin6->sin6_port = sin->sin_port; 2766 in6_in_2_v4mapin6(&sin->sin_addr, &sin6->sin6_addr); 2767 } 2768 2769 /* Convert sockaddr_in6 into sockaddr_in. */ 2770 void 2771 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2772 { 2773 struct sockaddr_in *sin_p; 2774 struct sockaddr_in6 sin6; 2775 2776 /* 2777 * Save original sockaddr_in6 addr and convert it 2778 * to sockaddr_in. 2779 */ 2780 sin6 = *(struct sockaddr_in6 *)nam; 2781 sin_p = (struct sockaddr_in *)nam; 2782 in6_sin6_2_sin(sin_p, &sin6); 2783 } 2784 2785 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2786 void 2787 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2788 { 2789 struct sockaddr_in *sin_p; 2790 struct sockaddr_in6 *sin6_p; 2791 2792 sin6_p = malloc(sizeof(*sin6_p), M_SONAME, M_WAITOK); 2793 sin_p = (struct sockaddr_in *)*nam; 2794 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2795 free(*nam, M_SONAME); 2796 *nam = sin6tosa(sin6_p); 2797 } 2798
Indexes created Wed Sep 24 22:09:59 GMT 2025