1 /* $NetBSD: in6.c,v 1.237 2017/01/23 10:19:03 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 1.237 2017/01/23 10:19:03 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 /* 782 * Update parameters of an IPv6 interface address. 783 * If necessary, a new entry is created and linked into address chains. 784 * This function is separated from in6_control(). 785 * XXX: should this be performed under splsoftnet()? 786 */ 787 static int 788 in6_update_ifa1(struct ifnet *ifp, struct in6_aliasreq *ifra, 789 struct in6_ifaddr **iap, struct psref *psref, int flags) 790 { 791 int error = 0, hostIsNew = 0, plen = -1; 792 struct sockaddr_in6 dst6; 793 struct in6_addrlifetime *lt; 794 struct in6_multi_mship *imm; 795 struct in6_multi *in6m_sol; 796 struct rtentry *rt; 797 int dad_delay, was_tentative; 798 struct in6_ifaddr *ia = iap ? *iap : NULL; 799 char ip6buf[INET6_ADDRSTRLEN]; 800 801 KASSERT((iap == NULL && psref == NULL) || 802 (iap != NULL && psref != NULL)); 803 804 in6m_sol = NULL; 805 806 /* Validate parameters */ 807 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 808 return EINVAL; 809 810 /* 811 * The destination address for a p2p link must have a family 812 * of AF_UNSPEC or AF_INET6. 813 */ 814 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 815 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 816 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 817 return EAFNOSUPPORT; 818 /* 819 * validate ifra_prefixmask. don't check sin6_family, netmask 820 * does not carry fields other than sin6_len. 821 */ 822 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 823 return EINVAL; 824 /* 825 * Because the IPv6 address architecture is classless, we require 826 * users to specify a (non 0) prefix length (mask) for a new address. 827 * We also require the prefix (when specified) mask is valid, and thus 828 * reject a non-consecutive mask. 829 */ 830 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 831 return EINVAL; 832 if (ifra->ifra_prefixmask.sin6_len != 0) { 833 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 834 (u_char *)&ifra->ifra_prefixmask + 835 ifra->ifra_prefixmask.sin6_len); 836 if (plen <= 0) 837 return EINVAL; 838 } else { 839 /* 840 * In this case, ia must not be NULL. We just use its prefix 841 * length. 842 */ 843 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 844 } 845 /* 846 * If the destination address on a p2p interface is specified, 847 * and the address is a scoped one, validate/set the scope 848 * zone identifier. 849 */ 850 dst6 = ifra->ifra_dstaddr; 851 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 852 (dst6.sin6_family == AF_INET6)) { 853 struct in6_addr in6_tmp; 854 u_int32_t zoneid; 855 856 in6_tmp = dst6.sin6_addr; 857 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 858 return EINVAL; /* XXX: should be impossible */ 859 860 if (dst6.sin6_scope_id != 0) { 861 if (dst6.sin6_scope_id != zoneid) 862 return EINVAL; 863 } else /* user omit to specify the ID. */ 864 dst6.sin6_scope_id = zoneid; 865 866 /* convert into the internal form */ 867 if (sa6_embedscope(&dst6, 0)) 868 return EINVAL; /* XXX: should be impossible */ 869 } 870 /* 871 * The destination address can be specified only for a p2p or a 872 * loopback interface. If specified, the corresponding prefix length 873 * must be 128. 874 */ 875 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 876 #ifdef FORCE_P2PPLEN 877 int i; 878 #endif 879 880 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 881 /* XXX: noisy message */ 882 nd6log(LOG_INFO, "a destination can " 883 "be specified for a p2p or a loopback IF only\n"); 884 return EINVAL; 885 } 886 if (plen != 128) { 887 nd6log(LOG_INFO, "prefixlen should " 888 "be 128 when dstaddr is specified\n"); 889 #ifdef FORCE_P2PPLEN 890 /* 891 * To be compatible with old configurations, 892 * such as ifconfig gif0 inet6 2001::1 2001::2 893 * prefixlen 126, we override the specified 894 * prefixmask as if the prefix length was 128. 895 */ 896 ifra->ifra_prefixmask.sin6_len = 897 sizeof(struct sockaddr_in6); 898 for (i = 0; i < 4; i++) 899 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i] = 900 0xffffffff; 901 plen = 128; 902 #else 903 return EINVAL; 904 #endif 905 } 906 } 907 /* lifetime consistency check */ 908 lt = &ifra->ifra_lifetime; 909 if (lt->ia6t_pltime > lt->ia6t_vltime) 910 return EINVAL; 911 if (lt->ia6t_vltime == 0) { 912 /* 913 * the following log might be noisy, but this is a typical 914 * configuration mistake or a tool's bug. 915 */ 916 nd6log(LOG_INFO, "valid lifetime is 0 for %s\n", 917 IN6_PRINT(ip6buf, &ifra->ifra_addr.sin6_addr)); 918 919 if (ia == NULL) 920 return 0; /* there's nothing to do */ 921 } 922 923 /* 924 * If this is a new address, allocate a new ifaddr and link it 925 * into chains. 926 */ 927 if (ia == NULL) { 928 hostIsNew = 1; 929 /* 930 * When in6_update_ifa() is called in a process of a received 931 * RA, it is called under an interrupt context. So, we should 932 * call malloc with M_NOWAIT. 933 */ 934 ia = malloc(sizeof(*ia), M_IFADDR, M_NOWAIT|M_ZERO); 935 if (ia == NULL) 936 return ENOBUFS; 937 LIST_INIT(&ia->ia6_memberships); 938 /* Initialize the address and masks, and put time stamp */ 939 ia->ia_ifa.ifa_addr = sin6tosa(&ia->ia_addr); 940 ia->ia_addr.sin6_family = AF_INET6; 941 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 942 ia->ia6_createtime = time_uptime; 943 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 944 /* 945 * XXX: some functions expect that ifa_dstaddr is not 946 * NULL for p2p interfaces. 947 */ 948 ia->ia_ifa.ifa_dstaddr = sin6tosa(&ia->ia_dstaddr); 949 } else { 950 ia->ia_ifa.ifa_dstaddr = NULL; 951 } 952 ia->ia_ifa.ifa_netmask = sin6tosa(&ia->ia_prefixmask); 953 954 ia->ia_ifp = ifp; 955 IN6_ADDRLIST_ENTRY_INIT(ia); 956 ifa_psref_init(&ia->ia_ifa); 957 } 958 959 /* update timestamp */ 960 ia->ia6_updatetime = time_uptime; 961 962 /* set prefix mask */ 963 if (ifra->ifra_prefixmask.sin6_len) { 964 if (ia->ia_prefixmask.sin6_len) { 965 /* 966 * We prohibit changing the prefix length of an 967 * existing autoconf address, because the operation 968 * would confuse prefix management. 969 */ 970 if (ia->ia6_ndpr != NULL && 971 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != 972 plen) 973 { 974 nd6log(LOG_INFO, "the prefix length of an" 975 " existing (%s) autoconf address should" 976 " not be changed\n", 977 IN6_PRINT(ip6buf, 978 &ia->ia_addr.sin6_addr)); 979 error = EINVAL; 980 if (hostIsNew) 981 free(ia, M_IFADDR); 982 goto exit; 983 } 984 985 if (!IN6_ARE_ADDR_EQUAL(&ia->ia_prefixmask.sin6_addr, 986 &ifra->ifra_prefixmask.sin6_addr)) 987 in6_ifremprefix(ia); 988 } 989 ia->ia_prefixmask = ifra->ifra_prefixmask; 990 } 991 992 /* Set destination address. */ 993 if (dst6.sin6_family == AF_INET6) { 994 if (!IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, 995 &ia->ia_dstaddr.sin6_addr)) 996 in6_ifremprefix(ia); 997 ia->ia_dstaddr = dst6; 998 } 999 1000 /* 1001 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1002 * to see if the address is deprecated or invalidated, but initialize 1003 * these members for applications. 1004 */ 1005 ia->ia6_lifetime = ifra->ifra_lifetime; 1006 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1007 ia->ia6_lifetime.ia6t_expire = 1008 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1009 } else 1010 ia->ia6_lifetime.ia6t_expire = 0; 1011 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1012 ia->ia6_lifetime.ia6t_preferred = 1013 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1014 } else 1015 ia->ia6_lifetime.ia6t_preferred = 0; 1016 1017 /* 1018 * configure address flags. 1019 * We need to preserve tentative state so DAD works if 1020 * something adds the same address before DAD finishes. 1021 */ 1022 was_tentative = ia->ia6_flags & (IN6_IFF_TENTATIVE|IN6_IFF_DUPLICATED); 1023 ia->ia6_flags = ifra->ifra_flags; 1024 1025 /* 1026 * Make the address tentative before joining multicast addresses, 1027 * so that corresponding MLD responses would not have a tentative 1028 * source address. 1029 */ 1030 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1031 if (ifp->if_link_state == LINK_STATE_DOWN) { 1032 ia->ia6_flags |= IN6_IFF_DETACHED; 1033 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1034 } else if ((hostIsNew || was_tentative) && if_do_dad(ifp)) 1035 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1036 1037 /* 1038 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1039 * userland, make it deprecated. 1040 */ 1041 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1042 ia->ia6_lifetime.ia6t_pltime = 0; 1043 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1044 } 1045 1046 /* reset the interface and routing table appropriately. */ 1047 error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew); 1048 if (error != 0) { 1049 if (hostIsNew) 1050 free(ia, M_IFADDR); 1051 goto exit; 1052 } 1053 1054 /* 1055 * We are done if we have simply modified an existing address. 1056 */ 1057 if (!hostIsNew) 1058 return error; 1059 1060 /* 1061 * Insert ia to the global list and ifa to the interface's list. 1062 */ 1063 mutex_enter(&in6_ifaddr_lock); 1064 IN6_ADDRLIST_WRITER_INSERT_TAIL(ia); 1065 mutex_exit(&in6_ifaddr_lock); 1066 1067 /* gain a refcnt for the link from in6_ifaddr */ 1068 ifaref(&ia->ia_ifa); 1069 ifa_insert(ifp, &ia->ia_ifa); 1070 1071 /* 1072 * Beyond this point, we should call in6_purgeaddr upon an error, 1073 * not just go to unlink. 1074 */ 1075 1076 /* join necessary multicast groups */ 1077 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1078 struct sockaddr_in6 mltaddr, mltmask; 1079 struct in6_addr llsol; 1080 1081 /* join solicited multicast addr for new host id */ 1082 memset(&llsol, 0, sizeof(struct in6_addr)); 1083 llsol.s6_addr16[0] = htons(0xff02); 1084 llsol.s6_addr32[1] = 0; 1085 llsol.s6_addr32[2] = htonl(1); 1086 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 1087 llsol.s6_addr8[12] = 0xff; 1088 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) { 1089 /* XXX: should not happen */ 1090 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 1091 goto cleanup; 1092 } 1093 dad_delay = 0; 1094 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1095 /* 1096 * We need a random delay for DAD on the address 1097 * being configured. It also means delaying 1098 * transmission of the corresponding MLD report to 1099 * avoid report collision. 1100 * [draft-ietf-ipv6-rfc2462bis-02.txt] 1101 */ 1102 dad_delay = cprng_fast32() % 1103 (MAX_RTR_SOLICITATION_DELAY * hz); 1104 } 1105 1106 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */ 1107 /* join solicited multicast addr for new host id */ 1108 imm = in6_joingroup(ifp, &llsol, &error, dad_delay); 1109 if (!imm) { 1110 nd6log(LOG_ERR, 1111 "addmulti failed for %s on %s (errno=%d)\n", 1112 IN6_PRINT(ip6buf, &llsol), if_name(ifp), error); 1113 goto cleanup; 1114 } 1115 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1116 in6m_sol = imm->i6mm_maddr; 1117 1118 sockaddr_in6_init(&mltmask, &in6mask32, 0, 0, 0); 1119 1120 /* 1121 * join link-local all-nodes address 1122 */ 1123 sockaddr_in6_init(&mltaddr, &in6addr_linklocal_allnodes, 1124 0, 0, 0); 1125 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1126 goto cleanup; /* XXX: should not fail */ 1127 1128 /* 1129 * XXX: do we really need this automatic routes? 1130 * We should probably reconsider this stuff. Most applications 1131 * actually do not need the routes, since they usually specify 1132 * the outgoing interface. 1133 */ 1134 rt = rtalloc1(sin6tosa(&mltaddr), 0); 1135 if (rt) { 1136 if (memcmp(&mltaddr.sin6_addr, 1137 &satocsin6(rt_getkey(rt))->sin6_addr, 1138 MLTMASK_LEN)) { 1139 rt_unref(rt); 1140 rt = NULL; 1141 } else if (rt->rt_ifp != ifp) { 1142 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 1143 "network %04x:%04x::/32 = %04x:%04x::/32\n", 1144 __func__, rt->rt_ifp, ifp, ifp->if_xname, 1145 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 1146 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 1147 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 1148 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 1149 rt_replace_ifa(rt, &ia->ia_ifa); 1150 rt->rt_ifp = ifp; 1151 } 1152 } 1153 if (!rt) { 1154 struct rt_addrinfo info; 1155 1156 memset(&info, 0, sizeof(info)); 1157 info.rti_info[RTAX_DST] = sin6tosa(&mltaddr); 1158 info.rti_info[RTAX_GATEWAY] = sin6tosa(&ia->ia_addr); 1159 info.rti_info[RTAX_NETMASK] = sin6tosa(&mltmask); 1160 info.rti_info[RTAX_IFA] = sin6tosa(&ia->ia_addr); 1161 /* XXX: we need RTF_CONNECTED to fake nd6_rtrequest */ 1162 info.rti_flags = RTF_UP | RTF_CONNECTED; 1163 error = rtrequest1(RTM_ADD, &info, NULL); 1164 if (error) 1165 goto cleanup; 1166 } else { 1167 rt_unref(rt); 1168 } 1169 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1170 if (!imm) { 1171 nd6log(LOG_WARNING, 1172 "addmulti failed for %s on %s (errno=%d)\n", 1173 IN6_PRINT(ip6buf, &mltaddr.sin6_addr), 1174 if_name(ifp), error); 1175 goto cleanup; 1176 } 1177 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1178 1179 /* 1180 * join node information group address 1181 */ 1182 dad_delay = 0; 1183 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1184 /* 1185 * The spec doesn't say anything about delay for this 1186 * group, but the same logic should apply. 1187 */ 1188 dad_delay = cprng_fast32() % 1189 (MAX_RTR_SOLICITATION_DELAY * hz); 1190 } 1191 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr) != 0) 1192 ; 1193 else if ((imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 1194 dad_delay)) == NULL) { /* XXX jinmei */ 1195 nd6log(LOG_WARNING, 1196 "addmulti failed for %s on %s (errno=%d)\n", 1197 IN6_PRINT(ip6buf, &mltaddr.sin6_addr), 1198 if_name(ifp), error); 1199 /* XXX not very fatal, go on... */ 1200 } else { 1201 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1202 } 1203 1204 1205 /* 1206 * join interface-local all-nodes address. 1207 * (ff01::1%ifN, and ff01::%ifN/32) 1208 */ 1209 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1210 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1211 goto cleanup; /* XXX: should not fail */ 1212 1213 /* XXX: again, do we really need the route? */ 1214 rt = rtalloc1(sin6tosa(&mltaddr), 0); 1215 if (rt) { 1216 /* 32bit came from "mltmask" */ 1217 if (memcmp(&mltaddr.sin6_addr, 1218 &satocsin6(rt_getkey(rt))->sin6_addr, 1219 32 / NBBY)) { 1220 rt_unref(rt); 1221 rt = NULL; 1222 } else if (rt->rt_ifp != ifp) { 1223 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 1224 "network %04x:%04x::/32 = %04x:%04x::/32\n", 1225 __func__, rt->rt_ifp, ifp, ifp->if_xname, 1226 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 1227 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 1228 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 1229 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 1230 rt_replace_ifa(rt, &ia->ia_ifa); 1231 rt->rt_ifp = ifp; 1232 } 1233 } 1234 if (!rt) { 1235 struct rt_addrinfo info; 1236 1237 memset(&info, 0, sizeof(info)); 1238 info.rti_info[RTAX_DST] = sin6tosa(&mltaddr); 1239 info.rti_info[RTAX_GATEWAY] = sin6tosa(&ia->ia_addr); 1240 info.rti_info[RTAX_NETMASK] = sin6tosa(&mltmask); 1241 info.rti_info[RTAX_IFA] = sin6tosa(&ia->ia_addr); 1242 info.rti_flags = RTF_UP | RTF_CONNECTED; 1243 error = rtrequest1(RTM_ADD, &info, NULL); 1244 if (error) 1245 goto cleanup; 1246 #undef MLTMASK_LEN 1247 } else { 1248 rt_unref(rt); 1249 } 1250 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1251 if (!imm) { 1252 nd6log(LOG_WARNING, 1253 "addmulti failed for %s on %s (errno=%d)\n", 1254 IN6_PRINT(ip6buf, &mltaddr.sin6_addr), 1255 if_name(ifp), error); 1256 goto cleanup; 1257 } else { 1258 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1259 } 1260 } 1261 1262 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1263 error = nd6_add_ifa_lle(ia); 1264 if (error != 0) 1265 goto cleanup; 1266 1267 /* 1268 * Perform DAD, if needed. 1269 * XXX It may be of use, if we can administratively 1270 * disable DAD. 1271 */ 1272 if (hostIsNew && if_do_dad(ifp) && 1273 ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && 1274 (ia->ia6_flags & IN6_IFF_TENTATIVE)) 1275 { 1276 int mindelay, maxdelay; 1277 1278 dad_delay = 0; 1279 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1280 /* 1281 * We need to impose a delay before sending an NS 1282 * for DAD. Check if we also needed a delay for the 1283 * corresponding MLD message. If we did, the delay 1284 * should be larger than the MLD delay (this could be 1285 * relaxed a bit, but this simple logic is at least 1286 * safe). 1287 */ 1288 mindelay = 0; 1289 if (in6m_sol != NULL && 1290 in6m_sol->in6m_state == MLD_REPORTPENDING) { 1291 mindelay = in6m_sol->in6m_timer; 1292 } 1293 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1294 if (maxdelay - mindelay == 0) 1295 dad_delay = 0; 1296 else { 1297 dad_delay = 1298 (cprng_fast32() % (maxdelay - mindelay)) + 1299 mindelay; 1300 } 1301 } 1302 /* +1 ensures callout is always used */ 1303 nd6_dad_start(&ia->ia_ifa, dad_delay + 1); 1304 } 1305 1306 if (iap != NULL) { 1307 *iap = ia; 1308 if (hostIsNew) 1309 ia6_acquire(ia, psref); 1310 } 1311 1312 return 0; 1313 1314 cleanup: 1315 in6_purgeaddr(&ia->ia_ifa); 1316 exit: 1317 return error; 1318 } 1319 1320 int 1321 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags) 1322 { 1323 int rc, s; 1324 1325 s = splsoftnet(); 1326 rc = in6_update_ifa1(ifp, ifra, NULL, NULL, flags); 1327 splx(s); 1328 return rc; 1329 } 1330 1331 void 1332 in6_purgeaddr(struct ifaddr *ifa) 1333 { 1334 struct ifnet *ifp = ifa->ifa_ifp; 1335 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1336 struct in6_multi_mship *imm; 1337 1338 KASSERT(!ifa_held(ifa)); 1339 1340 ifa->ifa_flags |= IFA_DESTROYING; 1341 1342 /* stop DAD processing */ 1343 nd6_dad_stop(ifa); 1344 1345 /* Delete any network route. */ 1346 in6_ifremprefix(ia); 1347 1348 /* Remove ownaddr's loopback rtentry, if it exists. */ 1349 in6_ifremlocal(&(ia->ia_ifa)); 1350 1351 /* 1352 * leave from multicast groups we have joined for the interface 1353 */ 1354 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1355 LIST_REMOVE(imm, i6mm_chain); 1356 in6_leavegroup(imm); 1357 } 1358 1359 in6_unlink_ifa(ia, ifp); 1360 } 1361 1362 static void 1363 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1364 { 1365 int s = splsoftnet(); 1366 1367 mutex_enter(&in6_ifaddr_lock); 1368 IN6_ADDRLIST_WRITER_REMOVE(ia); 1369 ifa_remove(ifp, &ia->ia_ifa); 1370 mutex_exit(&in6_ifaddr_lock); 1371 1372 /* 1373 * XXX thorpej@NetBSD.org -- if the interface is going 1374 * XXX away, don't save the multicast entries, delete them! 1375 */ 1376 if (LIST_EMPTY(&ia->ia6_multiaddrs)) 1377 ; 1378 else if (if_is_deactivated(ia->ia_ifa.ifa_ifp)) { 1379 struct in6_multi *in6m, *next; 1380 1381 for (in6m = LIST_FIRST(&ia->ia6_multiaddrs); in6m != NULL; 1382 in6m = next) { 1383 next = LIST_NEXT(in6m, in6m_entry); 1384 in6_delmulti(in6m); 1385 } 1386 } else 1387 in6_savemkludge(ia); 1388 1389 /* 1390 * Release the reference to the ND prefix. 1391 */ 1392 if (ia->ia6_ndpr != NULL) { 1393 nd6_prefix_unref(ia->ia6_ndpr); 1394 ia->ia6_ndpr = NULL; 1395 } 1396 1397 /* 1398 * Also, if the address being removed is autoconf'ed, call 1399 * nd6_pfxlist_onlink_check() since the release might affect the status of 1400 * other (detached) addresses. 1401 */ 1402 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) != 0) { 1403 ND6_WLOCK(); 1404 nd6_pfxlist_onlink_check(); 1405 ND6_UNLOCK(); 1406 } 1407 1408 IN6_ADDRLIST_ENTRY_DESTROY(ia); 1409 1410 /* 1411 * release another refcnt for the link from in6_ifaddr. 1412 * Note that we should decrement the refcnt at least once for all *BSD. 1413 */ 1414 ifafree(&ia->ia_ifa); 1415 1416 splx(s); 1417 } 1418 1419 void 1420 in6_purgeif(struct ifnet *ifp) 1421 { 1422 1423 in6_ifdetach(ifp); 1424 } 1425 1426 /* 1427 * SIOC[GAD]LIFADDR. 1428 * SIOCGLIFADDR: get first address. (?) 1429 * SIOCGLIFADDR with IFLR_PREFIX: 1430 * get first address that matches the specified prefix. 1431 * SIOCALIFADDR: add the specified address. 1432 * SIOCALIFADDR with IFLR_PREFIX: 1433 * add the specified prefix, filling hostid part from 1434 * the first link-local address. prefixlen must be <= 64. 1435 * SIOCDLIFADDR: delete the specified address. 1436 * SIOCDLIFADDR with IFLR_PREFIX: 1437 * delete the first address that matches the specified prefix. 1438 * return values: 1439 * EINVAL on invalid parameters 1440 * EADDRNOTAVAIL on prefix match failed/specified address not found 1441 * other values may be returned from in6_ioctl() 1442 * 1443 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1444 * this is to accommodate address naming scheme other than RFC2374, 1445 * in the future. 1446 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1447 * address encoding scheme. (see figure on page 8) 1448 */ 1449 static int 1450 in6_lifaddr_ioctl(struct socket *so, u_long cmd, void *data, 1451 struct ifnet *ifp) 1452 { 1453 struct in6_ifaddr *ia = NULL; /* XXX gcc 4.8 maybe-uninitialized */ 1454 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1455 struct ifaddr *ifa; 1456 struct sockaddr *sa; 1457 1458 /* sanity checks */ 1459 if (!data || !ifp) { 1460 panic("invalid argument to in6_lifaddr_ioctl"); 1461 /* NOTREACHED */ 1462 } 1463 1464 switch (cmd) { 1465 case SIOCGLIFADDR: 1466 /* address must be specified on GET with IFLR_PREFIX */ 1467 if ((iflr->flags & IFLR_PREFIX) == 0) 1468 break; 1469 /* FALLTHROUGH */ 1470 case SIOCALIFADDR: 1471 case SIOCDLIFADDR: 1472 /* address must be specified on ADD and DELETE */ 1473 sa = (struct sockaddr *)&iflr->addr; 1474 if (sa->sa_family != AF_INET6) 1475 return EINVAL; 1476 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1477 return EINVAL; 1478 /* XXX need improvement */ 1479 sa = (struct sockaddr *)&iflr->dstaddr; 1480 if (sa->sa_family && sa->sa_family != AF_INET6) 1481 return EINVAL; 1482 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1483 return EINVAL; 1484 break; 1485 default: /* shouldn't happen */ 1486 #if 0 1487 panic("invalid cmd to in6_lifaddr_ioctl"); 1488 /* NOTREACHED */ 1489 #else 1490 return EOPNOTSUPP; 1491 #endif 1492 } 1493 if (sizeof(struct in6_addr) * NBBY < iflr->prefixlen) 1494 return EINVAL; 1495 1496 switch (cmd) { 1497 case SIOCALIFADDR: 1498 { 1499 struct in6_aliasreq ifra; 1500 struct in6_addr *xhostid = NULL; 1501 int prefixlen; 1502 int bound = curlwp_bind(); 1503 struct psref psref; 1504 1505 if ((iflr->flags & IFLR_PREFIX) != 0) { 1506 struct sockaddr_in6 *sin6; 1507 1508 /* 1509 * xhostid is to fill in the hostid part of the 1510 * address. xhostid points to the first link-local 1511 * address attached to the interface. 1512 */ 1513 ia = in6ifa_ifpforlinklocal_psref(ifp, 0, &psref); 1514 if (ia == NULL) { 1515 curlwp_bindx(bound); 1516 return EADDRNOTAVAIL; 1517 } 1518 xhostid = IFA_IN6(&ia->ia_ifa); 1519 1520 /* prefixlen must be <= 64. */ 1521 if (64 < iflr->prefixlen) { 1522 ia6_release(ia, &psref); 1523 curlwp_bindx(bound); 1524 return EINVAL; 1525 } 1526 prefixlen = iflr->prefixlen; 1527 1528 /* hostid part must be zero. */ 1529 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1530 if (sin6->sin6_addr.s6_addr32[2] != 0 1531 || sin6->sin6_addr.s6_addr32[3] != 0) { 1532 ia6_release(ia, &psref); 1533 curlwp_bindx(bound); 1534 return EINVAL; 1535 } 1536 } else 1537 prefixlen = iflr->prefixlen; 1538 1539 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1540 memset(&ifra, 0, sizeof(ifra)); 1541 memcpy(ifra.ifra_name, iflr->iflr_name, sizeof(ifra.ifra_name)); 1542 1543 memcpy(&ifra.ifra_addr, &iflr->addr, 1544 ((struct sockaddr *)&iflr->addr)->sa_len); 1545 if (xhostid) { 1546 /* fill in hostid part */ 1547 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1548 xhostid->s6_addr32[2]; 1549 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1550 xhostid->s6_addr32[3]; 1551 } 1552 1553 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1554 memcpy(&ifra.ifra_dstaddr, &iflr->dstaddr, 1555 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1556 if (xhostid) { 1557 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1558 xhostid->s6_addr32[2]; 1559 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1560 xhostid->s6_addr32[3]; 1561 } 1562 } 1563 if (xhostid) { 1564 ia6_release(ia, &psref); 1565 ia = NULL; 1566 } 1567 curlwp_bindx(bound); 1568 1569 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1570 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1571 1572 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 1573 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 1574 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1575 return in6_control(so, SIOCAIFADDR_IN6, &ifra, ifp); 1576 } 1577 case SIOCGLIFADDR: 1578 case SIOCDLIFADDR: 1579 { 1580 struct in6_addr mask, candidate, match; 1581 struct sockaddr_in6 *sin6; 1582 int cmp; 1583 int error, s; 1584 1585 memset(&mask, 0, sizeof(mask)); 1586 if (iflr->flags & IFLR_PREFIX) { 1587 /* lookup a prefix rather than address. */ 1588 in6_prefixlen2mask(&mask, iflr->prefixlen); 1589 1590 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1591 memcpy(&match, &sin6->sin6_addr, sizeof(match)); 1592 match.s6_addr32[0] &= mask.s6_addr32[0]; 1593 match.s6_addr32[1] &= mask.s6_addr32[1]; 1594 match.s6_addr32[2] &= mask.s6_addr32[2]; 1595 match.s6_addr32[3] &= mask.s6_addr32[3]; 1596 1597 /* if you set extra bits, that's wrong */ 1598 if (memcmp(&match, &sin6->sin6_addr, sizeof(match))) 1599 return EINVAL; 1600 1601 cmp = 1; 1602 } else { 1603 if (cmd == SIOCGLIFADDR) { 1604 /* on getting an address, take the 1st match */ 1605 cmp = 0; /* XXX */ 1606 } else { 1607 /* on deleting an address, do exact match */ 1608 in6_prefixlen2mask(&mask, 128); 1609 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1610 memcpy(&match, &sin6->sin6_addr, sizeof(match)); 1611 1612 cmp = 1; 1613 } 1614 } 1615 1616 s = pserialize_read_enter(); 1617 IFADDR_READER_FOREACH(ifa, ifp) { 1618 if (ifa->ifa_addr->sa_family != AF_INET6) 1619 continue; 1620 if (!cmp) 1621 break; 1622 1623 /* 1624 * XXX: this is adhoc, but is necessary to allow 1625 * a user to specify fe80::/64 (not /10) for a 1626 * link-local address. 1627 */ 1628 memcpy(&candidate, IFA_IN6(ifa), sizeof(candidate)); 1629 in6_clearscope(&candidate); 1630 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1631 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1632 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1633 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1634 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1635 break; 1636 } 1637 if (!ifa) { 1638 error = EADDRNOTAVAIL; 1639 goto error; 1640 } 1641 ia = ifa2ia6(ifa); 1642 1643 if (cmd == SIOCGLIFADDR) { 1644 /* fill in the if_laddrreq structure */ 1645 memcpy(&iflr->addr, &ia->ia_addr, ia->ia_addr.sin6_len); 1646 error = sa6_recoverscope( 1647 (struct sockaddr_in6 *)&iflr->addr); 1648 if (error != 0) 1649 goto error; 1650 1651 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1652 memcpy(&iflr->dstaddr, &ia->ia_dstaddr, 1653 ia->ia_dstaddr.sin6_len); 1654 error = sa6_recoverscope( 1655 (struct sockaddr_in6 *)&iflr->dstaddr); 1656 if (error != 0) 1657 goto error; 1658 } else 1659 memset(&iflr->dstaddr, 0, sizeof(iflr->dstaddr)); 1660 1661 iflr->prefixlen = 1662 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1663 1664 iflr->flags = ia->ia6_flags; /* XXX */ 1665 1666 error = 0; 1667 } else { 1668 struct in6_aliasreq ifra; 1669 1670 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1671 memset(&ifra, 0, sizeof(ifra)); 1672 memcpy(ifra.ifra_name, iflr->iflr_name, 1673 sizeof(ifra.ifra_name)); 1674 1675 memcpy(&ifra.ifra_addr, &ia->ia_addr, 1676 ia->ia_addr.sin6_len); 1677 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1678 memcpy(&ifra.ifra_dstaddr, &ia->ia_dstaddr, 1679 ia->ia_dstaddr.sin6_len); 1680 } else { 1681 memset(&ifra.ifra_dstaddr, 0, 1682 sizeof(ifra.ifra_dstaddr)); 1683 } 1684 memcpy(&ifra.ifra_dstaddr, &ia->ia_prefixmask, 1685 ia->ia_prefixmask.sin6_len); 1686 1687 ifra.ifra_flags = ia->ia6_flags; 1688 pserialize_read_exit(s); 1689 1690 return in6_control(so, SIOCDIFADDR_IN6, &ifra, ifp); 1691 } 1692 error: 1693 pserialize_read_exit(s); 1694 return error; 1695 } 1696 } 1697 1698 return EOPNOTSUPP; /* just for safety */ 1699 } 1700 1701 /* 1702 * Initialize an interface's internet6 address 1703 * and routing table entry. 1704 */ 1705 static int 1706 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1707 const struct sockaddr_in6 *sin6, int newhost) 1708 { 1709 int error = 0, ifacount = 0; 1710 int s = splsoftnet(); 1711 struct ifaddr *ifa; 1712 1713 /* 1714 * Give the interface a chance to initialize 1715 * if this is its first address, 1716 * and to validate the address if necessary. 1717 */ 1718 IFADDR_READER_FOREACH(ifa, ifp) { 1719 if (ifa->ifa_addr->sa_family != AF_INET6) 1720 continue; 1721 ifacount++; 1722 } 1723 1724 ia->ia_addr = *sin6; 1725 1726 if (ifacount <= 0 && 1727 (error = if_addr_init(ifp, &ia->ia_ifa, true)) != 0) { 1728 splx(s); 1729 return error; 1730 } 1731 splx(s); 1732 1733 ia->ia_ifa.ifa_metric = ifp->if_metric; 1734 1735 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1736 1737 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1738 if (newhost) { 1739 /* set the rtrequest function to create llinfo */ 1740 if (ifp->if_flags & IFF_POINTOPOINT) 1741 ia->ia_ifa.ifa_rtrequest = p2p_rtrequest; 1742 else if ((ifp->if_flags & IFF_LOOPBACK) == 0) 1743 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1744 in6_ifaddlocal(&ia->ia_ifa); 1745 } else { 1746 /* Inform the routing socket of new flags/timings */ 1747 rt_newaddrmsg(RTM_NEWADDR, &ia->ia_ifa, 0, NULL); 1748 } 1749 1750 /* Add the network prefix route. */ 1751 if ((error = in6_ifaddprefix(ia)) != 0) { 1752 if (newhost) 1753 in6_ifremlocal(&ia->ia_ifa); 1754 return error; 1755 } 1756 1757 if (ifp->if_flags & IFF_MULTICAST) 1758 in6_restoremkludge(ia, ifp); 1759 1760 return error; 1761 } 1762 1763 static struct ifaddr * 1764 bestifa(struct ifaddr *best_ifa, struct ifaddr *ifa) 1765 { 1766 if (best_ifa == NULL || best_ifa->ifa_preference < ifa->ifa_preference) 1767 return ifa; 1768 return best_ifa; 1769 } 1770 1771 /* 1772 * Find an IPv6 interface link-local address specific to an interface. 1773 */ 1774 struct in6_ifaddr * 1775 in6ifa_ifpforlinklocal(const struct ifnet *ifp, const int ignoreflags) 1776 { 1777 struct ifaddr *best_ifa = NULL, *ifa; 1778 1779 IFADDR_READER_FOREACH(ifa, ifp) { 1780 if (ifa->ifa_addr->sa_family != AF_INET6) 1781 continue; 1782 if (!IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) 1783 continue; 1784 if ((((struct in6_ifaddr *)ifa)->ia6_flags & ignoreflags) != 0) 1785 continue; 1786 best_ifa = bestifa(best_ifa, ifa); 1787 } 1788 1789 return (struct in6_ifaddr *)best_ifa; 1790 } 1791 1792 struct in6_ifaddr * 1793 in6ifa_ifpforlinklocal_psref(const struct ifnet *ifp, const int ignoreflags, 1794 struct psref *psref) 1795 { 1796 struct in6_ifaddr *ia; 1797 int s = pserialize_read_enter(); 1798 1799 ia = in6ifa_ifpforlinklocal(ifp, ignoreflags); 1800 if (ia != NULL) 1801 ia6_acquire(ia, psref); 1802 pserialize_read_exit(s); 1803 1804 return ia; 1805 } 1806 1807 /* 1808 * find the internet address corresponding to a given address. 1809 * ifaddr is returned referenced. 1810 */ 1811 struct in6_ifaddr * 1812 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid) 1813 { 1814 struct in6_ifaddr *ia; 1815 int s; 1816 1817 s = pserialize_read_enter(); 1818 IN6_ADDRLIST_READER_FOREACH(ia) { 1819 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1820 if (zoneid != 0 && 1821 zoneid != ia->ia_addr.sin6_scope_id) 1822 continue; 1823 ifaref(&ia->ia_ifa); 1824 break; 1825 } 1826 } 1827 pserialize_read_exit(s); 1828 1829 return ia; 1830 } 1831 1832 /* 1833 * find the internet address corresponding to a given interface and address. 1834 */ 1835 struct in6_ifaddr * 1836 in6ifa_ifpwithaddr(const struct ifnet *ifp, const struct in6_addr *addr) 1837 { 1838 struct ifaddr *best_ifa = NULL, *ifa; 1839 1840 IFADDR_READER_FOREACH(ifa, ifp) { 1841 if (ifa->ifa_addr->sa_family != AF_INET6) 1842 continue; 1843 if (!IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1844 continue; 1845 best_ifa = bestifa(best_ifa, ifa); 1846 } 1847 1848 return (struct in6_ifaddr *)best_ifa; 1849 } 1850 1851 struct in6_ifaddr * 1852 in6ifa_ifpwithaddr_psref(const struct ifnet *ifp, const struct in6_addr *addr, 1853 struct psref *psref) 1854 { 1855 struct in6_ifaddr *ia; 1856 int s = pserialize_read_enter(); 1857 1858 ia = in6ifa_ifpwithaddr(ifp, addr); 1859 if (ia != NULL) 1860 ia6_acquire(ia, psref); 1861 pserialize_read_exit(s); 1862 1863 return ia; 1864 } 1865 1866 static struct in6_ifaddr * 1867 bestia(struct in6_ifaddr *best_ia, struct in6_ifaddr *ia) 1868 { 1869 if (best_ia == NULL || 1870 best_ia->ia_ifa.ifa_preference < ia->ia_ifa.ifa_preference) 1871 return ia; 1872 return best_ia; 1873 } 1874 1875 /* 1876 * Determine if an address is on a local network. 1877 */ 1878 int 1879 in6_localaddr(const struct in6_addr *in6) 1880 { 1881 struct in6_ifaddr *ia; 1882 int s; 1883 1884 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1885 return 1; 1886 1887 s = pserialize_read_enter(); 1888 IN6_ADDRLIST_READER_FOREACH(ia) { 1889 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1890 &ia->ia_prefixmask.sin6_addr)) { 1891 pserialize_read_exit(s); 1892 return 1; 1893 } 1894 } 1895 pserialize_read_exit(s); 1896 1897 return 0; 1898 } 1899 1900 int 1901 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1902 { 1903 struct in6_ifaddr *ia; 1904 int s; 1905 1906 s = pserialize_read_enter(); 1907 IN6_ADDRLIST_READER_FOREACH(ia) { 1908 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1909 &sa6->sin6_addr) && 1910 #ifdef SCOPEDROUTING 1911 ia->ia_addr.sin6_scope_id == sa6->sin6_scope_id && 1912 #endif 1913 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) { 1914 pserialize_read_exit(s); 1915 return 1; /* true */ 1916 } 1917 1918 /* XXX: do we still have to go thru the rest of the list? */ 1919 } 1920 pserialize_read_exit(s); 1921 1922 return 0; /* false */ 1923 } 1924 1925 /* 1926 * return length of part which dst and src are equal 1927 * hard coding... 1928 */ 1929 int 1930 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1931 { 1932 int match = 0; 1933 u_char *s = (u_char *)src, *d = (u_char *)dst; 1934 u_char *lim = s + 16, r; 1935 1936 while (s < lim) 1937 if ((r = (*d++ ^ *s++)) != 0) { 1938 while (r < 128) { 1939 match++; 1940 r <<= 1; 1941 } 1942 break; 1943 } else 1944 match += NBBY; 1945 return match; 1946 } 1947 1948 /* XXX: to be scope conscious */ 1949 int 1950 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1951 { 1952 int bytelen, bitlen; 1953 1954 /* sanity check */ 1955 if (len < 0 || len > 128) { 1956 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1957 len); 1958 return 0; 1959 } 1960 1961 bytelen = len / NBBY; 1962 bitlen = len % NBBY; 1963 1964 if (memcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1965 return 0; 1966 if (bitlen != 0 && 1967 p1->s6_addr[bytelen] >> (NBBY - bitlen) != 1968 p2->s6_addr[bytelen] >> (NBBY - bitlen)) 1969 return 0; 1970 1971 return 1; 1972 } 1973 1974 void 1975 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1976 { 1977 static const u_char maskarray[NBBY] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1978 int bytelen, bitlen, i; 1979 1980 /* sanity check */ 1981 if (len < 0 || len > 128) { 1982 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1983 len); 1984 return; 1985 } 1986 1987 memset(maskp, 0, sizeof(*maskp)); 1988 bytelen = len / NBBY; 1989 bitlen = len % NBBY; 1990 for (i = 0; i < bytelen; i++) 1991 maskp->s6_addr[i] = 0xff; 1992 if (bitlen) 1993 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1994 } 1995 1996 /* 1997 * return the best address out of the same scope. if no address was 1998 * found, return the first valid address from designated IF. 1999 */ 2000 struct in6_ifaddr * 2001 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2002 { 2003 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2004 struct ifaddr *ifa; 2005 struct in6_ifaddr *best_ia = NULL, *ia; 2006 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2007 2008 dep[0] = dep[1] = NULL; 2009 2010 /* 2011 * We first look for addresses in the same scope. 2012 * If there is one, return it. 2013 * If two or more, return one which matches the dst longest. 2014 * If none, return one of global addresses assigned other ifs. 2015 */ 2016 IFADDR_READER_FOREACH(ifa, ifp) { 2017 if (ifa->ifa_addr->sa_family != AF_INET6) 2018 continue; 2019 ia = (struct in6_ifaddr *)ifa; 2020 if (ia->ia6_flags & IN6_IFF_ANYCAST) 2021 continue; /* XXX: is there any case to allow anycast? */ 2022 if (ia->ia6_flags & IN6_IFF_NOTREADY) 2023 continue; /* don't use this interface */ 2024 if (ia->ia6_flags & IN6_IFF_DETACHED) 2025 continue; 2026 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2027 if (ip6_use_deprecated) 2028 dep[0] = ia; 2029 continue; 2030 } 2031 2032 if (dst_scope != in6_addrscope(IFA_IN6(ifa))) 2033 continue; 2034 /* 2035 * call in6_matchlen() as few as possible 2036 */ 2037 if (best_ia == NULL) { 2038 best_ia = ia; 2039 continue; 2040 } 2041 if (blen == -1) 2042 blen = in6_matchlen(&best_ia->ia_addr.sin6_addr, dst); 2043 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2044 if (tlen > blen) { 2045 blen = tlen; 2046 best_ia = ia; 2047 } else if (tlen == blen) 2048 best_ia = bestia(best_ia, ia); 2049 } 2050 if (best_ia != NULL) 2051 return best_ia; 2052 2053 IFADDR_READER_FOREACH(ifa, ifp) { 2054 if (ifa->ifa_addr->sa_family != AF_INET6) 2055 continue; 2056 ia = (struct in6_ifaddr *)ifa; 2057 if (ia->ia6_flags & IN6_IFF_ANYCAST) 2058 continue; /* XXX: is there any case to allow anycast? */ 2059 if (ia->ia6_flags & IN6_IFF_NOTREADY) 2060 continue; /* don't use this interface */ 2061 if (ia->ia6_flags & IN6_IFF_DETACHED) 2062 continue; 2063 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2064 if (ip6_use_deprecated) 2065 dep[1] = (struct in6_ifaddr *)ifa; 2066 continue; 2067 } 2068 2069 best_ia = bestia(best_ia, ia); 2070 } 2071 if (best_ia != NULL) 2072 return best_ia; 2073 2074 /* use the last-resort values, that are, deprecated addresses */ 2075 if (dep[0]) 2076 return dep[0]; 2077 if (dep[1]) 2078 return dep[1]; 2079 2080 return NULL; 2081 } 2082 2083 /* 2084 * perform DAD when interface becomes IFF_UP. 2085 */ 2086 void 2087 in6_if_link_up(struct ifnet *ifp) 2088 { 2089 struct ifaddr *ifa; 2090 struct in6_ifaddr *ia; 2091 int s, bound; 2092 char ip6buf[INET6_ADDRSTRLEN]; 2093 2094 /* Ensure it's sane to run DAD */ 2095 if (ifp->if_link_state == LINK_STATE_DOWN) 2096 return; 2097 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 2098 return; 2099 2100 bound = curlwp_bind(); 2101 s = pserialize_read_enter(); 2102 IFADDR_READER_FOREACH(ifa, ifp) { 2103 struct psref psref; 2104 2105 if (ifa->ifa_addr->sa_family != AF_INET6) 2106 continue; 2107 2108 ifa_acquire(ifa, &psref); 2109 pserialize_read_exit(s); 2110 ia = (struct in6_ifaddr *)ifa; 2111 2112 /* If detached then mark as tentative */ 2113 if (ia->ia6_flags & IN6_IFF_DETACHED) { 2114 ia->ia6_flags &= ~IN6_IFF_DETACHED; 2115 if (if_do_dad(ifp)) { 2116 ia->ia6_flags |= IN6_IFF_TENTATIVE; 2117 nd6log(LOG_ERR, "%s marked tentative\n", 2118 IN6_PRINT(ip6buf, 2119 &ia->ia_addr.sin6_addr)); 2120 } else if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) 2121 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 2122 } 2123 2124 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2125 int rand_delay; 2126 2127 /* Clear the duplicated flag as we're starting DAD. */ 2128 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; 2129 2130 /* 2131 * The TENTATIVE flag was likely set by hand 2132 * beforehand, implicitly indicating the need for DAD. 2133 * We may be able to skip the random delay in this 2134 * case, but we impose delays just in case. 2135 */ 2136 rand_delay = cprng_fast32() % 2137 (MAX_RTR_SOLICITATION_DELAY * hz); 2138 /* +1 ensures callout is always used */ 2139 nd6_dad_start(ifa, rand_delay + 1); 2140 } 2141 2142 s = pserialize_read_enter(); 2143 ifa_release(ifa, &psref); 2144 } 2145 pserialize_read_exit(s); 2146 curlwp_bindx(bound); 2147 2148 /* Restore any detached prefixes */ 2149 ND6_WLOCK(); 2150 nd6_pfxlist_onlink_check(); 2151 ND6_UNLOCK(); 2152 } 2153 2154 void 2155 in6_if_up(struct ifnet *ifp) 2156 { 2157 2158 /* 2159 * special cases, like 6to4, are handled in in6_ifattach 2160 */ 2161 in6_ifattach(ifp, NULL); 2162 2163 /* interface may not support link state, so bring it up also */ 2164 in6_if_link_up(ifp); 2165 } 2166 2167 /* 2168 * Mark all addresses as detached. 2169 */ 2170 void 2171 in6_if_link_down(struct ifnet *ifp) 2172 { 2173 struct ifaddr *ifa; 2174 struct in6_ifaddr *ia; 2175 int s, bound; 2176 char ip6buf[INET6_ADDRSTRLEN]; 2177 2178 /* Any prefixes on this interface should be detached as well */ 2179 ND6_WLOCK(); 2180 nd6_pfxlist_onlink_check(); 2181 ND6_UNLOCK(); 2182 2183 bound = curlwp_bind(); 2184 s = pserialize_read_enter(); 2185 IFADDR_READER_FOREACH(ifa, ifp) { 2186 struct psref psref; 2187 2188 if (ifa->ifa_addr->sa_family != AF_INET6) 2189 continue; 2190 2191 ifa_acquire(ifa, &psref); 2192 pserialize_read_exit(s); 2193 ia = (struct in6_ifaddr *)ifa; 2194 2195 /* Stop DAD processing */ 2196 nd6_dad_stop(ifa); 2197 2198 /* 2199 * Mark the address as detached. 2200 * This satisfies RFC4862 Section 5.3, but we should apply 2201 * this logic to all addresses to be a good citizen and 2202 * avoid potential duplicated addresses. 2203 * When the interface comes up again, detached addresses 2204 * are marked tentative and DAD commences. 2205 */ 2206 if (!(ia->ia6_flags & IN6_IFF_DETACHED)) { 2207 nd6log(LOG_DEBUG, "%s marked detached\n", 2208 IN6_PRINT(ip6buf, &ia->ia_addr.sin6_addr)); 2209 ia->ia6_flags |= IN6_IFF_DETACHED; 2210 ia->ia6_flags &= 2211 ~(IN6_IFF_TENTATIVE | IN6_IFF_DUPLICATED); 2212 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 2213 } 2214 2215 s = pserialize_read_enter(); 2216 ifa_release(ifa, &psref); 2217 } 2218 pserialize_read_exit(s); 2219 curlwp_bindx(bound); 2220 } 2221 2222 void 2223 in6_if_down(struct ifnet *ifp) 2224 { 2225 2226 in6_if_link_down(ifp); 2227 } 2228 2229 void 2230 in6_if_link_state_change(struct ifnet *ifp, int link_state) 2231 { 2232 2233 switch (link_state) { 2234 case LINK_STATE_DOWN: 2235 in6_if_link_down(ifp); 2236 break; 2237 case LINK_STATE_UP: 2238 in6_if_link_up(ifp); 2239 break; 2240 } 2241 } 2242 2243 /* 2244 * Calculate max IPv6 MTU through all the interfaces and store it 2245 * to in6_maxmtu. 2246 */ 2247 void 2248 in6_setmaxmtu(void) 2249 { 2250 unsigned long maxmtu = 0; 2251 struct ifnet *ifp; 2252 int s; 2253 2254 s = pserialize_read_enter(); 2255 IFNET_READER_FOREACH(ifp) { 2256 /* this function can be called during ifnet initialization */ 2257 if (!ifp->if_afdata[AF_INET6]) 2258 continue; 2259 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2260 IN6_LINKMTU(ifp) > maxmtu) 2261 maxmtu = IN6_LINKMTU(ifp); 2262 } 2263 pserialize_read_exit(s); 2264 if (maxmtu) /* update only when maxmtu is positive */ 2265 in6_maxmtu = maxmtu; 2266 } 2267 2268 /* 2269 * Provide the length of interface identifiers to be used for the link attached 2270 * to the given interface. The length should be defined in "IPv6 over 2271 * xxx-link" document. Note that address architecture might also define 2272 * the length for a particular set of address prefixes, regardless of the 2273 * link type. As clarified in rfc2462bis, those two definitions should be 2274 * consistent, and those really are as of August 2004. 2275 */ 2276 int 2277 in6_if2idlen(struct ifnet *ifp) 2278 { 2279 switch (ifp->if_type) { 2280 case IFT_ETHER: /* RFC2464 */ 2281 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2282 case IFT_L2VLAN: /* ditto */ 2283 case IFT_IEEE80211: /* ditto */ 2284 case IFT_FDDI: /* RFC2467 */ 2285 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 2286 case IFT_PPP: /* RFC2472 */ 2287 case IFT_ARCNET: /* RFC2497 */ 2288 case IFT_FRELAY: /* RFC2590 */ 2289 case IFT_IEEE1394: /* RFC3146 */ 2290 case IFT_GIF: /* draft-ietf-v6ops-mech-v2-07 */ 2291 case IFT_LOOP: /* XXX: is this really correct? */ 2292 return 64; 2293 default: 2294 /* 2295 * Unknown link type: 2296 * It might be controversial to use the today's common constant 2297 * of 64 for these cases unconditionally. For full compliance, 2298 * we should return an error in this case. On the other hand, 2299 * if we simply miss the standard for the link type or a new 2300 * standard is defined for a new link type, the IFID length 2301 * is very likely to be the common constant. As a compromise, 2302 * we always use the constant, but make an explicit notice 2303 * indicating the "unknown" case. 2304 */ 2305 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2306 return 64; 2307 } 2308 } 2309 2310 struct in6_llentry { 2311 struct llentry base; 2312 }; 2313 2314 #define IN6_LLTBL_DEFAULT_HSIZE 32 2315 #define IN6_LLTBL_HASH(k, h) \ 2316 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 2317 2318 /* 2319 * Do actual deallocation of @lle. 2320 * Called by LLE_FREE_LOCKED when number of references 2321 * drops to zero. 2322 */ 2323 static void 2324 in6_lltable_destroy_lle(struct llentry *lle) 2325 { 2326 2327 LLE_WUNLOCK(lle); 2328 LLE_LOCK_DESTROY(lle); 2329 kmem_intr_free(lle, sizeof(struct in6_llentry)); 2330 } 2331 2332 static struct llentry * 2333 in6_lltable_new(const struct in6_addr *addr6, u_int flags) 2334 { 2335 struct in6_llentry *lle; 2336 2337 lle = kmem_intr_zalloc(sizeof(struct in6_llentry), KM_NOSLEEP); 2338 if (lle == NULL) /* NB: caller generates msg */ 2339 return NULL; 2340 2341 lle->base.r_l3addr.addr6 = *addr6; 2342 lle->base.lle_refcnt = 1; 2343 lle->base.lle_free = in6_lltable_destroy_lle; 2344 LLE_LOCK_INIT(&lle->base); 2345 callout_init(&lle->base.lle_timer, CALLOUT_MPSAFE); 2346 2347 return &lle->base; 2348 } 2349 2350 static int 2351 in6_lltable_match_prefix(const struct sockaddr *prefix, 2352 const struct sockaddr *mask, u_int flags, struct llentry *lle) 2353 { 2354 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix; 2355 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask; 2356 2357 if (IN6_ARE_MASKED_ADDR_EQUAL(&lle->r_l3addr.addr6, 2358 &pfx->sin6_addr, &msk->sin6_addr) && 2359 ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) 2360 return 1; 2361 2362 return 0; 2363 } 2364 2365 static void 2366 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle) 2367 { 2368 struct ifnet *ifp = llt->llt_ifp; 2369 2370 IF_AFDATA_WLOCK_ASSERT(ifp); 2371 LLE_WLOCK_ASSERT(lle); 2372 2373 /* Unlink entry from table */ 2374 if ((lle->la_flags & LLE_LINKED) != 0) { 2375 2376 lltable_unlink_entry(llt, lle); 2377 KASSERT((lle->la_flags & LLE_LINKED) == 0); 2378 } 2379 /* 2380 * We need to release the lock here to lle_timer proceeds; 2381 * lle_timer should stop immediately if LLE_LINKED isn't set. 2382 * Note that we cannot pass lle->lle_lock to callout_halt 2383 * because it's a rwlock. 2384 */ 2385 LLE_ADDREF(lle); 2386 LLE_WUNLOCK(lle); 2387 IF_AFDATA_WUNLOCK(ifp); 2388 2389 #ifdef NET_MPSAFE 2390 callout_halt(&lle->lle_timer, NULL); 2391 #else 2392 if (mutex_owned(softnet_lock)) 2393 callout_halt(&lle->lle_timer, softnet_lock); 2394 else 2395 callout_halt(&lle->lle_timer, NULL); 2396 #endif 2397 LLE_WLOCK(lle); 2398 LLE_REMREF(lle); 2399 2400 lltable_drop_entry_queue(lle); 2401 LLE_FREE_LOCKED(lle); 2402 2403 IF_AFDATA_WLOCK(ifp); 2404 } 2405 2406 static int 2407 in6_lltable_rtcheck(struct ifnet *ifp, 2408 u_int flags, 2409 const struct sockaddr *l3addr) 2410 { 2411 struct rtentry *rt; 2412 char ip6buf[INET6_ADDRSTRLEN]; 2413 2414 KASSERTMSG(l3addr->sa_family == AF_INET6, 2415 "sin_family %d", l3addr->sa_family); 2416 2417 rt = rtalloc1(l3addr, 0); 2418 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 2419 int s; 2420 struct ifaddr *ifa; 2421 /* 2422 * Create an ND6 cache for an IPv6 neighbor 2423 * that is not covered by our own prefix. 2424 */ 2425 /* XXX ifaof_ifpforaddr should take a const param */ 2426 s = pserialize_read_enter(); 2427 ifa = ifaof_ifpforaddr(l3addr, ifp); 2428 if (ifa != NULL) { 2429 pserialize_read_exit(s); 2430 if (rt != NULL) 2431 rt_unref(rt); 2432 return 0; 2433 } 2434 pserialize_read_exit(s); 2435 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2436 IN6_PRINT(ip6buf, 2437 &((const struct sockaddr_in6 *)l3addr)->sin6_addr)); 2438 if (rt != NULL) 2439 rt_unref(rt); 2440 return EINVAL; 2441 } 2442 rt_unref(rt); 2443 return 0; 2444 } 2445 2446 static inline uint32_t 2447 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize) 2448 { 2449 2450 return IN6_LLTBL_HASH(dst->s6_addr32[3], hsize); 2451 } 2452 2453 static uint32_t 2454 in6_lltable_hash(const struct llentry *lle, uint32_t hsize) 2455 { 2456 2457 return in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize); 2458 } 2459 2460 static void 2461 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 2462 { 2463 struct sockaddr_in6 *sin6; 2464 2465 sin6 = (struct sockaddr_in6 *)sa; 2466 bzero(sin6, sizeof(*sin6)); 2467 sin6->sin6_family = AF_INET6; 2468 sin6->sin6_len = sizeof(*sin6); 2469 sin6->sin6_addr = lle->r_l3addr.addr6; 2470 } 2471 2472 static inline struct llentry * 2473 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst) 2474 { 2475 struct llentry *lle; 2476 struct llentries *lleh; 2477 u_int hashidx; 2478 2479 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize); 2480 lleh = &llt->lle_head[hashidx]; 2481 LIST_FOREACH(lle, lleh, lle_next) { 2482 if (lle->la_flags & LLE_DELETED) 2483 continue; 2484 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst)) 2485 break; 2486 } 2487 2488 return lle; 2489 } 2490 2491 static int 2492 in6_lltable_delete(struct lltable *llt, u_int flags, 2493 const struct sockaddr *l3addr) 2494 { 2495 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2496 struct llentry *lle; 2497 2498 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp); 2499 KASSERTMSG(l3addr->sa_family == AF_INET6, 2500 "sin_family %d", l3addr->sa_family); 2501 2502 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2503 2504 if (lle == NULL) 2505 return ENOENT; 2506 2507 LLE_WLOCK(lle); 2508 lle->la_flags |= LLE_DELETED; 2509 #ifdef DIAGNOSTIC 2510 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2511 #endif 2512 if ((lle->la_flags & (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC) 2513 llentry_free(lle); 2514 else 2515 LLE_WUNLOCK(lle); 2516 2517 return 0; 2518 } 2519 2520 static struct llentry * 2521 in6_lltable_create(struct lltable *llt, u_int flags, 2522 const struct sockaddr *l3addr) 2523 { 2524 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2525 struct ifnet *ifp = llt->llt_ifp; 2526 struct llentry *lle; 2527 2528 IF_AFDATA_WLOCK_ASSERT(ifp); 2529 KASSERTMSG(l3addr->sa_family == AF_INET6, 2530 "sin_family %d", l3addr->sa_family); 2531 2532 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2533 2534 if (lle != NULL) { 2535 LLE_WLOCK(lle); 2536 return lle; 2537 } 2538 2539 /* 2540 * A route that covers the given address must have 2541 * been installed 1st because we are doing a resolution, 2542 * verify this. 2543 */ 2544 if (!(flags & LLE_IFADDR) && 2545 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2546 return NULL; 2547 2548 lle = in6_lltable_new(&sin6->sin6_addr, flags); 2549 if (lle == NULL) { 2550 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2551 return NULL; 2552 } 2553 lle->la_flags = flags; 2554 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 2555 memcpy(&lle->ll_addr, CLLADDR(ifp->if_sadl), ifp->if_addrlen); 2556 lle->la_flags |= LLE_VALID; 2557 } 2558 2559 lltable_link_entry(llt, lle); 2560 LLE_WLOCK(lle); 2561 2562 return lle; 2563 } 2564 2565 static struct llentry * 2566 in6_lltable_lookup(struct lltable *llt, u_int flags, 2567 const struct sockaddr *l3addr) 2568 { 2569 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2570 struct llentry *lle; 2571 2572 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 2573 KASSERTMSG(l3addr->sa_family == AF_INET6, 2574 "sin_family %d", l3addr->sa_family); 2575 2576 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2577 2578 if (lle == NULL) 2579 return NULL; 2580 2581 if (flags & LLE_EXCLUSIVE) 2582 LLE_WLOCK(lle); 2583 else 2584 LLE_RLOCK(lle); 2585 return lle; 2586 } 2587 2588 static int 2589 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 2590 struct rt_walkarg *w) 2591 { 2592 struct sockaddr_in6 sin6; 2593 2594 LLTABLE_LOCK_ASSERT(); 2595 2596 /* skip deleted entries */ 2597 if (lle->la_flags & LLE_DELETED) 2598 return 0; 2599 2600 sockaddr_in6_init(&sin6, &lle->r_l3addr.addr6, 0, 0, 0); 2601 2602 return lltable_dump_entry(llt, lle, w, sin6tosa(&sin6)); 2603 } 2604 2605 static struct lltable * 2606 in6_lltattach(struct ifnet *ifp) 2607 { 2608 struct lltable *llt; 2609 2610 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE); 2611 llt->llt_af = AF_INET6; 2612 llt->llt_ifp = ifp; 2613 2614 llt->llt_lookup = in6_lltable_lookup; 2615 llt->llt_create = in6_lltable_create; 2616 llt->llt_delete = in6_lltable_delete; 2617 llt->llt_dump_entry = in6_lltable_dump_entry; 2618 llt->llt_hash = in6_lltable_hash; 2619 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry; 2620 llt->llt_free_entry = in6_lltable_free_entry; 2621 llt->llt_match_prefix = in6_lltable_match_prefix; 2622 lltable_link(llt); 2623 2624 return llt; 2625 } 2626 2627 void * 2628 in6_domifattach(struct ifnet *ifp) 2629 { 2630 struct in6_ifextra *ext; 2631 2632 ext = malloc(sizeof(*ext), M_IFADDR, M_WAITOK|M_ZERO); 2633 2634 ext->in6_ifstat = malloc(sizeof(struct in6_ifstat), 2635 M_IFADDR, M_WAITOK|M_ZERO); 2636 2637 ext->icmp6_ifstat = malloc(sizeof(struct icmp6_ifstat), 2638 M_IFADDR, M_WAITOK|M_ZERO); 2639 2640 ext->nd_ifinfo = nd6_ifattach(ifp); 2641 ext->scope6_id = scope6_ifattach(ifp); 2642 ext->nprefixes = 0; 2643 ext->ndefrouters = 0; 2644 2645 ext->lltable = in6_lltattach(ifp); 2646 2647 return ext; 2648 } 2649 2650 void 2651 in6_domifdetach(struct ifnet *ifp, void *aux) 2652 { 2653 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2654 2655 lltable_free(ext->lltable); 2656 ext->lltable = NULL; 2657 nd6_ifdetach(ifp, ext); 2658 free(ext->in6_ifstat, M_IFADDR); 2659 free(ext->icmp6_ifstat, M_IFADDR); 2660 scope6_ifdetach(ext->scope6_id); 2661 free(ext, M_IFADDR); 2662 } 2663 2664 /* 2665 * Convert IPv4 address stored in struct in_addr to IPv4-Mapped IPv6 address 2666 * stored in struct in6_addr as defined in RFC 4921 section 2.5.5.2. 2667 */ 2668 void 2669 in6_in_2_v4mapin6(const struct in_addr *in, struct in6_addr *in6) 2670 { 2671 in6->s6_addr32[0] = 0; 2672 in6->s6_addr32[1] = 0; 2673 in6->s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2674 in6->s6_addr32[3] = in->s_addr; 2675 } 2676 2677 /* 2678 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2679 * v4 mapped addr or v4 compat addr 2680 */ 2681 void 2682 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2683 { 2684 memset(sin, 0, sizeof(*sin)); 2685 sin->sin_len = sizeof(struct sockaddr_in); 2686 sin->sin_family = AF_INET; 2687 sin->sin_port = sin6->sin6_port; 2688 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2689 } 2690 2691 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2692 void 2693 in6_sin_2_v4mapsin6(const struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2694 { 2695 memset(sin6, 0, sizeof(*sin6)); 2696 sin6->sin6_len = sizeof(struct sockaddr_in6); 2697 sin6->sin6_family = AF_INET6; 2698 sin6->sin6_port = sin->sin_port; 2699 in6_in_2_v4mapin6(&sin->sin_addr, &sin6->sin6_addr); 2700 } 2701 2702 /* Convert sockaddr_in6 into sockaddr_in. */ 2703 void 2704 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2705 { 2706 struct sockaddr_in *sin_p; 2707 struct sockaddr_in6 sin6; 2708 2709 /* 2710 * Save original sockaddr_in6 addr and convert it 2711 * to sockaddr_in. 2712 */ 2713 sin6 = *(struct sockaddr_in6 *)nam; 2714 sin_p = (struct sockaddr_in *)nam; 2715 in6_sin6_2_sin(sin_p, &sin6); 2716 } 2717 2718 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2719 void 2720 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2721 { 2722 struct sockaddr_in *sin_p; 2723 struct sockaddr_in6 *sin6_p; 2724 2725 sin6_p = malloc(sizeof(*sin6_p), M_SONAME, M_WAITOK); 2726 sin_p = (struct sockaddr_in *)*nam; 2727 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2728 free(*nam, M_SONAME); 2729 *nam = sin6tosa(sin6_p); 2730 } 2731