in6.c revision 1.250
1 /* $NetBSD: in6.c,v 1.250 2017/11/10 07:24:28 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 1.250 2017/11/10 07:24:28 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 if (nd6_need_cache(ifp)) { 1302 /* XXX maybe unnecessary */ 1303 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1304 ia->ia_ifa.ifa_flags |= RTF_CONNECTED; 1305 } 1306 1307 /* 1308 * Perform DAD, if needed. 1309 * XXX It may be of use, if we can administratively 1310 * disable DAD. 1311 */ 1312 if (hostIsNew && if_do_dad(ifp) && 1313 ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && 1314 (ia->ia6_flags & IN6_IFF_TENTATIVE)) 1315 { 1316 int mindelay, maxdelay; 1317 1318 dad_delay = 0; 1319 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1320 struct in6_addr llsol; 1321 struct in6_multi *in6m_sol = NULL; 1322 /* 1323 * We need to impose a delay before sending an NS 1324 * for DAD. Check if we also needed a delay for the 1325 * corresponding MLD message. If we did, the delay 1326 * should be larger than the MLD delay (this could be 1327 * relaxed a bit, but this simple logic is at least 1328 * safe). 1329 */ 1330 mindelay = 0; 1331 error = in6_get_llsol_addr(&llsol, ifp, 1332 &ifra->ifra_addr.sin6_addr); 1333 in6_multi_lock(RW_READER); 1334 if (error == 0) 1335 in6m_sol = in6_lookup_multi(&llsol, ifp); 1336 if (in6m_sol != NULL && 1337 in6m_sol->in6m_state == MLD_REPORTPENDING) { 1338 mindelay = in6m_sol->in6m_timer; 1339 } 1340 in6_multi_unlock(); 1341 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1342 if (maxdelay - mindelay == 0) 1343 dad_delay = 0; 1344 else { 1345 dad_delay = 1346 (cprng_fast32() % (maxdelay - mindelay)) + 1347 mindelay; 1348 } 1349 } 1350 /* +1 ensures callout is always used */ 1351 nd6_dad_start(&ia->ia_ifa, dad_delay + 1); 1352 } 1353 1354 if (iap != NULL) { 1355 *iap = ia; 1356 if (hostIsNew) 1357 ia6_acquire(ia, psref); 1358 } 1359 1360 return 0; 1361 1362 cleanup: 1363 in6_purgeaddr(&ia->ia_ifa); 1364 exit: 1365 return error; 1366 } 1367 1368 int 1369 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags) 1370 { 1371 int rc, s; 1372 1373 s = splsoftnet(); 1374 rc = in6_update_ifa1(ifp, ifra, NULL, NULL, flags); 1375 splx(s); 1376 return rc; 1377 } 1378 1379 void 1380 in6_purgeaddr(struct ifaddr *ifa) 1381 { 1382 struct ifnet *ifp = ifa->ifa_ifp; 1383 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1384 struct in6_multi_mship *imm; 1385 1386 KASSERT(!ifa_held(ifa)); 1387 1388 ifa->ifa_flags |= IFA_DESTROYING; 1389 1390 /* stop DAD processing */ 1391 nd6_dad_stop(ifa); 1392 1393 /* Delete any network route. */ 1394 in6_ifremprefix(ia); 1395 1396 /* Remove ownaddr's loopback rtentry, if it exists. */ 1397 in6_ifremlocal(&(ia->ia_ifa)); 1398 1399 /* 1400 * leave from multicast groups we have joined for the interface 1401 */ 1402 mutex_enter(&in6_ifaddr_lock); 1403 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1404 LIST_REMOVE(imm, i6mm_chain); 1405 mutex_exit(&in6_ifaddr_lock); 1406 in6_leavegroup(imm); 1407 mutex_enter(&in6_ifaddr_lock); 1408 } 1409 mutex_exit(&in6_ifaddr_lock); 1410 1411 in6_unlink_ifa(ia, ifp); 1412 } 1413 1414 static void 1415 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1416 { 1417 int s = splsoftnet(); 1418 1419 mutex_enter(&in6_ifaddr_lock); 1420 IN6_ADDRLIST_WRITER_REMOVE(ia); 1421 ifa_remove(ifp, &ia->ia_ifa); 1422 mutex_exit(&in6_ifaddr_lock); 1423 1424 /* 1425 * Release the reference to the ND prefix. 1426 */ 1427 if (ia->ia6_ndpr != NULL) { 1428 nd6_prefix_unref(ia->ia6_ndpr); 1429 ia->ia6_ndpr = NULL; 1430 } 1431 1432 /* 1433 * Also, if the address being removed is autoconf'ed, call 1434 * nd6_pfxlist_onlink_check() since the release might affect the status of 1435 * other (detached) addresses. 1436 */ 1437 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) != 0) { 1438 ND6_WLOCK(); 1439 nd6_pfxlist_onlink_check(); 1440 ND6_UNLOCK(); 1441 } 1442 1443 IN6_ADDRLIST_ENTRY_DESTROY(ia); 1444 1445 /* 1446 * release another refcnt for the link from in6_ifaddr. 1447 * Note that we should decrement the refcnt at least once for all *BSD. 1448 */ 1449 ifafree(&ia->ia_ifa); 1450 1451 splx(s); 1452 } 1453 1454 void 1455 in6_purgeif(struct ifnet *ifp) 1456 { 1457 1458 in6_ifdetach(ifp); 1459 } 1460 1461 void 1462 in6_purge_mcast_references(struct in6_multi *in6m) 1463 { 1464 struct in6_ifaddr *ia; 1465 1466 KASSERT(in6_multi_locked(RW_WRITER)); 1467 1468 mutex_enter(&in6_ifaddr_lock); 1469 IN6_ADDRLIST_WRITER_FOREACH(ia) { 1470 struct in6_multi_mship *imm; 1471 LIST_FOREACH(imm, &ia->ia6_memberships, i6mm_chain) { 1472 if (imm->i6mm_maddr == in6m) 1473 imm->i6mm_maddr = NULL; 1474 } 1475 } 1476 mutex_exit(&in6_ifaddr_lock); 1477 } 1478 1479 /* 1480 * SIOC[GAD]LIFADDR. 1481 * SIOCGLIFADDR: get first address. (?) 1482 * SIOCGLIFADDR with IFLR_PREFIX: 1483 * get first address that matches the specified prefix. 1484 * SIOCALIFADDR: add the specified address. 1485 * SIOCALIFADDR with IFLR_PREFIX: 1486 * add the specified prefix, filling hostid part from 1487 * the first link-local address. prefixlen must be <= 64. 1488 * SIOCDLIFADDR: delete the specified address. 1489 * SIOCDLIFADDR with IFLR_PREFIX: 1490 * delete the first address that matches the specified prefix. 1491 * return values: 1492 * EINVAL on invalid parameters 1493 * EADDRNOTAVAIL on prefix match failed/specified address not found 1494 * other values may be returned from in6_ioctl() 1495 * 1496 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1497 * this is to accommodate address naming scheme other than RFC2374, 1498 * in the future. 1499 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1500 * address encoding scheme. (see figure on page 8) 1501 */ 1502 static int 1503 in6_lifaddr_ioctl(struct socket *so, u_long cmd, void *data, 1504 struct ifnet *ifp) 1505 { 1506 struct in6_ifaddr *ia = NULL; /* XXX gcc 4.8 maybe-uninitialized */ 1507 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1508 struct ifaddr *ifa; 1509 struct sockaddr *sa; 1510 1511 /* sanity checks */ 1512 if (!data || !ifp) { 1513 panic("invalid argument to in6_lifaddr_ioctl"); 1514 /* NOTREACHED */ 1515 } 1516 1517 switch (cmd) { 1518 case SIOCGLIFADDR: 1519 /* address must be specified on GET with IFLR_PREFIX */ 1520 if ((iflr->flags & IFLR_PREFIX) == 0) 1521 break; 1522 /* FALLTHROUGH */ 1523 case SIOCALIFADDR: 1524 case SIOCDLIFADDR: 1525 /* address must be specified on ADD and DELETE */ 1526 sa = (struct sockaddr *)&iflr->addr; 1527 if (sa->sa_family != AF_INET6) 1528 return EINVAL; 1529 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1530 return EINVAL; 1531 /* XXX need improvement */ 1532 sa = (struct sockaddr *)&iflr->dstaddr; 1533 if (sa->sa_family && sa->sa_family != AF_INET6) 1534 return EINVAL; 1535 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1536 return EINVAL; 1537 break; 1538 default: /* shouldn't happen */ 1539 #if 0 1540 panic("invalid cmd to in6_lifaddr_ioctl"); 1541 /* NOTREACHED */ 1542 #else 1543 return EOPNOTSUPP; 1544 #endif 1545 } 1546 if (sizeof(struct in6_addr) * NBBY < iflr->prefixlen) 1547 return EINVAL; 1548 1549 switch (cmd) { 1550 case SIOCALIFADDR: 1551 { 1552 struct in6_aliasreq ifra; 1553 struct in6_addr *xhostid = NULL; 1554 int prefixlen; 1555 int bound = curlwp_bind(); 1556 struct psref psref; 1557 1558 if ((iflr->flags & IFLR_PREFIX) != 0) { 1559 struct sockaddr_in6 *sin6; 1560 1561 /* 1562 * xhostid is to fill in the hostid part of the 1563 * address. xhostid points to the first link-local 1564 * address attached to the interface. 1565 */ 1566 ia = in6ifa_ifpforlinklocal_psref(ifp, 0, &psref); 1567 if (ia == NULL) { 1568 curlwp_bindx(bound); 1569 return EADDRNOTAVAIL; 1570 } 1571 xhostid = IFA_IN6(&ia->ia_ifa); 1572 1573 /* prefixlen must be <= 64. */ 1574 if (64 < iflr->prefixlen) { 1575 ia6_release(ia, &psref); 1576 curlwp_bindx(bound); 1577 return EINVAL; 1578 } 1579 prefixlen = iflr->prefixlen; 1580 1581 /* hostid part must be zero. */ 1582 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1583 if (sin6->sin6_addr.s6_addr32[2] != 0 1584 || sin6->sin6_addr.s6_addr32[3] != 0) { 1585 ia6_release(ia, &psref); 1586 curlwp_bindx(bound); 1587 return EINVAL; 1588 } 1589 } else 1590 prefixlen = iflr->prefixlen; 1591 1592 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1593 memset(&ifra, 0, sizeof(ifra)); 1594 memcpy(ifra.ifra_name, iflr->iflr_name, sizeof(ifra.ifra_name)); 1595 1596 memcpy(&ifra.ifra_addr, &iflr->addr, 1597 ((struct sockaddr *)&iflr->addr)->sa_len); 1598 if (xhostid) { 1599 /* fill in hostid part */ 1600 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1601 xhostid->s6_addr32[2]; 1602 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1603 xhostid->s6_addr32[3]; 1604 } 1605 1606 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1607 memcpy(&ifra.ifra_dstaddr, &iflr->dstaddr, 1608 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1609 if (xhostid) { 1610 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1611 xhostid->s6_addr32[2]; 1612 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1613 xhostid->s6_addr32[3]; 1614 } 1615 } 1616 if (xhostid) { 1617 ia6_release(ia, &psref); 1618 ia = NULL; 1619 } 1620 curlwp_bindx(bound); 1621 1622 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1623 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1624 1625 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 1626 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 1627 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1628 return in6_control(so, SIOCAIFADDR_IN6, &ifra, ifp); 1629 } 1630 case SIOCGLIFADDR: 1631 case SIOCDLIFADDR: 1632 { 1633 struct in6_addr mask, candidate, match; 1634 struct sockaddr_in6 *sin6; 1635 int cmp; 1636 int error, s; 1637 1638 memset(&mask, 0, sizeof(mask)); 1639 if (iflr->flags & IFLR_PREFIX) { 1640 /* lookup a prefix rather than address. */ 1641 in6_prefixlen2mask(&mask, iflr->prefixlen); 1642 1643 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1644 memcpy(&match, &sin6->sin6_addr, sizeof(match)); 1645 match.s6_addr32[0] &= mask.s6_addr32[0]; 1646 match.s6_addr32[1] &= mask.s6_addr32[1]; 1647 match.s6_addr32[2] &= mask.s6_addr32[2]; 1648 match.s6_addr32[3] &= mask.s6_addr32[3]; 1649 1650 /* if you set extra bits, that's wrong */ 1651 if (memcmp(&match, &sin6->sin6_addr, sizeof(match))) 1652 return EINVAL; 1653 1654 cmp = 1; 1655 } else { 1656 if (cmd == SIOCGLIFADDR) { 1657 /* on getting an address, take the 1st match */ 1658 cmp = 0; /* XXX */ 1659 } else { 1660 /* on deleting an address, do exact match */ 1661 in6_prefixlen2mask(&mask, 128); 1662 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1663 memcpy(&match, &sin6->sin6_addr, sizeof(match)); 1664 1665 cmp = 1; 1666 } 1667 } 1668 1669 s = pserialize_read_enter(); 1670 IFADDR_READER_FOREACH(ifa, ifp) { 1671 if (ifa->ifa_addr->sa_family != AF_INET6) 1672 continue; 1673 if (!cmp) 1674 break; 1675 1676 /* 1677 * XXX: this is adhoc, but is necessary to allow 1678 * a user to specify fe80::/64 (not /10) for a 1679 * link-local address. 1680 */ 1681 memcpy(&candidate, IFA_IN6(ifa), sizeof(candidate)); 1682 in6_clearscope(&candidate); 1683 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1684 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1685 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1686 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1687 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1688 break; 1689 } 1690 if (!ifa) { 1691 error = EADDRNOTAVAIL; 1692 goto error; 1693 } 1694 ia = ifa2ia6(ifa); 1695 1696 if (cmd == SIOCGLIFADDR) { 1697 /* fill in the if_laddrreq structure */ 1698 memcpy(&iflr->addr, &ia->ia_addr, ia->ia_addr.sin6_len); 1699 error = sa6_recoverscope( 1700 (struct sockaddr_in6 *)&iflr->addr); 1701 if (error != 0) 1702 goto error; 1703 1704 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1705 memcpy(&iflr->dstaddr, &ia->ia_dstaddr, 1706 ia->ia_dstaddr.sin6_len); 1707 error = sa6_recoverscope( 1708 (struct sockaddr_in6 *)&iflr->dstaddr); 1709 if (error != 0) 1710 goto error; 1711 } else 1712 memset(&iflr->dstaddr, 0, sizeof(iflr->dstaddr)); 1713 1714 iflr->prefixlen = 1715 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1716 1717 iflr->flags = ia->ia6_flags; /* XXX */ 1718 1719 error = 0; 1720 } else { 1721 struct in6_aliasreq ifra; 1722 1723 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1724 memset(&ifra, 0, sizeof(ifra)); 1725 memcpy(ifra.ifra_name, iflr->iflr_name, 1726 sizeof(ifra.ifra_name)); 1727 1728 memcpy(&ifra.ifra_addr, &ia->ia_addr, 1729 ia->ia_addr.sin6_len); 1730 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1731 memcpy(&ifra.ifra_dstaddr, &ia->ia_dstaddr, 1732 ia->ia_dstaddr.sin6_len); 1733 } else { 1734 memset(&ifra.ifra_dstaddr, 0, 1735 sizeof(ifra.ifra_dstaddr)); 1736 } 1737 memcpy(&ifra.ifra_dstaddr, &ia->ia_prefixmask, 1738 ia->ia_prefixmask.sin6_len); 1739 1740 ifra.ifra_flags = ia->ia6_flags; 1741 pserialize_read_exit(s); 1742 1743 return in6_control(so, SIOCDIFADDR_IN6, &ifra, ifp); 1744 } 1745 error: 1746 pserialize_read_exit(s); 1747 return error; 1748 } 1749 } 1750 1751 return EOPNOTSUPP; /* just for safety */ 1752 } 1753 1754 /* 1755 * Initialize an interface's internet6 address 1756 * and routing table entry. 1757 */ 1758 static int 1759 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1760 const struct sockaddr_in6 *sin6, int newhost) 1761 { 1762 int error = 0, ifacount = 0; 1763 int s = splsoftnet(); 1764 struct ifaddr *ifa; 1765 1766 /* 1767 * Give the interface a chance to initialize 1768 * if this is its first address, 1769 * and to validate the address if necessary. 1770 */ 1771 IFADDR_READER_FOREACH(ifa, ifp) { 1772 if (ifa->ifa_addr->sa_family != AF_INET6) 1773 continue; 1774 ifacount++; 1775 } 1776 1777 ia->ia_addr = *sin6; 1778 1779 if (ifacount <= 0 && 1780 (error = if_addr_init(ifp, &ia->ia_ifa, true)) != 0) { 1781 splx(s); 1782 return error; 1783 } 1784 splx(s); 1785 1786 ia->ia_ifa.ifa_metric = ifp->if_metric; 1787 1788 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1789 1790 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1791 if (newhost) { 1792 /* set the rtrequest function to create llinfo */ 1793 if (ifp->if_flags & IFF_POINTOPOINT) 1794 ia->ia_ifa.ifa_rtrequest = p2p_rtrequest; 1795 else if ((ifp->if_flags & IFF_LOOPBACK) == 0) 1796 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1797 in6_ifaddlocal(&ia->ia_ifa); 1798 } else { 1799 /* Inform the routing socket of new flags/timings */ 1800 rt_newaddrmsg(RTM_NEWADDR, &ia->ia_ifa, 0, NULL); 1801 } 1802 1803 /* Add the network prefix route. */ 1804 if ((error = in6_ifaddprefix(ia)) != 0) { 1805 if (newhost) 1806 in6_ifremlocal(&ia->ia_ifa); 1807 return error; 1808 } 1809 1810 return error; 1811 } 1812 1813 static struct ifaddr * 1814 bestifa(struct ifaddr *best_ifa, struct ifaddr *ifa) 1815 { 1816 if (best_ifa == NULL || best_ifa->ifa_preference < ifa->ifa_preference) 1817 return ifa; 1818 return best_ifa; 1819 } 1820 1821 /* 1822 * Find an IPv6 interface link-local address specific to an interface. 1823 */ 1824 struct in6_ifaddr * 1825 in6ifa_ifpforlinklocal(const struct ifnet *ifp, const int ignoreflags) 1826 { 1827 struct ifaddr *best_ifa = NULL, *ifa; 1828 1829 IFADDR_READER_FOREACH(ifa, ifp) { 1830 if (ifa->ifa_addr->sa_family != AF_INET6) 1831 continue; 1832 if (!IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) 1833 continue; 1834 if ((((struct in6_ifaddr *)ifa)->ia6_flags & ignoreflags) != 0) 1835 continue; 1836 best_ifa = bestifa(best_ifa, ifa); 1837 } 1838 1839 return (struct in6_ifaddr *)best_ifa; 1840 } 1841 1842 struct in6_ifaddr * 1843 in6ifa_ifpforlinklocal_psref(const struct ifnet *ifp, const int ignoreflags, 1844 struct psref *psref) 1845 { 1846 struct in6_ifaddr *ia; 1847 int s = pserialize_read_enter(); 1848 1849 ia = in6ifa_ifpforlinklocal(ifp, ignoreflags); 1850 if (ia != NULL) 1851 ia6_acquire(ia, psref); 1852 pserialize_read_exit(s); 1853 1854 return ia; 1855 } 1856 1857 /* 1858 * find the internet address corresponding to a given address. 1859 * ifaddr is returned referenced. 1860 */ 1861 struct in6_ifaddr * 1862 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid) 1863 { 1864 struct in6_ifaddr *ia; 1865 int s; 1866 1867 s = pserialize_read_enter(); 1868 IN6_ADDRLIST_READER_FOREACH(ia) { 1869 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1870 if (zoneid != 0 && 1871 zoneid != ia->ia_addr.sin6_scope_id) 1872 continue; 1873 ifaref(&ia->ia_ifa); 1874 break; 1875 } 1876 } 1877 pserialize_read_exit(s); 1878 1879 return ia; 1880 } 1881 1882 /* 1883 * find the internet address corresponding to a given interface and address. 1884 */ 1885 struct in6_ifaddr * 1886 in6ifa_ifpwithaddr(const struct ifnet *ifp, const struct in6_addr *addr) 1887 { 1888 struct ifaddr *best_ifa = NULL, *ifa; 1889 1890 IFADDR_READER_FOREACH(ifa, ifp) { 1891 if (ifa->ifa_addr->sa_family != AF_INET6) 1892 continue; 1893 if (!IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1894 continue; 1895 best_ifa = bestifa(best_ifa, ifa); 1896 } 1897 1898 return (struct in6_ifaddr *)best_ifa; 1899 } 1900 1901 struct in6_ifaddr * 1902 in6ifa_ifpwithaddr_psref(const struct ifnet *ifp, const struct in6_addr *addr, 1903 struct psref *psref) 1904 { 1905 struct in6_ifaddr *ia; 1906 int s = pserialize_read_enter(); 1907 1908 ia = in6ifa_ifpwithaddr(ifp, addr); 1909 if (ia != NULL) 1910 ia6_acquire(ia, psref); 1911 pserialize_read_exit(s); 1912 1913 return ia; 1914 } 1915 1916 static struct in6_ifaddr * 1917 bestia(struct in6_ifaddr *best_ia, struct in6_ifaddr *ia) 1918 { 1919 if (best_ia == NULL || 1920 best_ia->ia_ifa.ifa_preference < ia->ia_ifa.ifa_preference) 1921 return ia; 1922 return best_ia; 1923 } 1924 1925 /* 1926 * Determine if an address is on a local network. 1927 */ 1928 int 1929 in6_localaddr(const struct in6_addr *in6) 1930 { 1931 struct in6_ifaddr *ia; 1932 int s; 1933 1934 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1935 return 1; 1936 1937 s = pserialize_read_enter(); 1938 IN6_ADDRLIST_READER_FOREACH(ia) { 1939 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1940 &ia->ia_prefixmask.sin6_addr)) { 1941 pserialize_read_exit(s); 1942 return 1; 1943 } 1944 } 1945 pserialize_read_exit(s); 1946 1947 return 0; 1948 } 1949 1950 int 1951 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1952 { 1953 struct in6_ifaddr *ia; 1954 int s; 1955 1956 s = pserialize_read_enter(); 1957 IN6_ADDRLIST_READER_FOREACH(ia) { 1958 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1959 &sa6->sin6_addr) && 1960 #ifdef SCOPEDROUTING 1961 ia->ia_addr.sin6_scope_id == sa6->sin6_scope_id && 1962 #endif 1963 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) { 1964 pserialize_read_exit(s); 1965 return 1; /* true */ 1966 } 1967 1968 /* XXX: do we still have to go thru the rest of the list? */ 1969 } 1970 pserialize_read_exit(s); 1971 1972 return 0; /* false */ 1973 } 1974 1975 /* 1976 * return length of part which dst and src are equal 1977 * hard coding... 1978 */ 1979 int 1980 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1981 { 1982 int match = 0; 1983 u_char *s = (u_char *)src, *d = (u_char *)dst; 1984 u_char *lim = s + 16, r; 1985 1986 while (s < lim) 1987 if ((r = (*d++ ^ *s++)) != 0) { 1988 while (r < 128) { 1989 match++; 1990 r <<= 1; 1991 } 1992 break; 1993 } else 1994 match += NBBY; 1995 return match; 1996 } 1997 1998 /* XXX: to be scope conscious */ 1999 int 2000 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 2001 { 2002 int bytelen, bitlen; 2003 2004 /* sanity check */ 2005 if (len < 0 || len > 128) { 2006 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 2007 len); 2008 return 0; 2009 } 2010 2011 bytelen = len / NBBY; 2012 bitlen = len % NBBY; 2013 2014 if (memcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 2015 return 0; 2016 if (bitlen != 0 && 2017 p1->s6_addr[bytelen] >> (NBBY - bitlen) != 2018 p2->s6_addr[bytelen] >> (NBBY - bitlen)) 2019 return 0; 2020 2021 return 1; 2022 } 2023 2024 void 2025 in6_prefixlen2mask(struct in6_addr *maskp, int len) 2026 { 2027 static const u_char maskarray[NBBY] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 2028 int bytelen, bitlen, i; 2029 2030 /* sanity check */ 2031 if (len < 0 || len > 128) { 2032 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 2033 len); 2034 return; 2035 } 2036 2037 memset(maskp, 0, sizeof(*maskp)); 2038 bytelen = len / NBBY; 2039 bitlen = len % NBBY; 2040 for (i = 0; i < bytelen; i++) 2041 maskp->s6_addr[i] = 0xff; 2042 if (bitlen) 2043 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 2044 } 2045 2046 /* 2047 * return the best address out of the same scope. if no address was 2048 * found, return the first valid address from designated IF. 2049 */ 2050 struct in6_ifaddr * 2051 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2052 { 2053 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2054 struct ifaddr *ifa; 2055 struct in6_ifaddr *best_ia = NULL, *ia; 2056 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2057 2058 dep[0] = dep[1] = NULL; 2059 2060 /* 2061 * We first look for addresses in the same scope. 2062 * If there is one, return it. 2063 * If two or more, return one which matches the dst longest. 2064 * If none, return one of global addresses assigned other ifs. 2065 */ 2066 IFADDR_READER_FOREACH(ifa, ifp) { 2067 if (ifa->ifa_addr->sa_family != AF_INET6) 2068 continue; 2069 ia = (struct in6_ifaddr *)ifa; 2070 if (ia->ia6_flags & IN6_IFF_ANYCAST) 2071 continue; /* XXX: is there any case to allow anycast? */ 2072 if (ia->ia6_flags & IN6_IFF_NOTREADY) 2073 continue; /* don't use this interface */ 2074 if (ia->ia6_flags & IN6_IFF_DETACHED) 2075 continue; 2076 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2077 if (ip6_use_deprecated) 2078 dep[0] = ia; 2079 continue; 2080 } 2081 2082 if (dst_scope != in6_addrscope(IFA_IN6(ifa))) 2083 continue; 2084 /* 2085 * call in6_matchlen() as few as possible 2086 */ 2087 if (best_ia == NULL) { 2088 best_ia = ia; 2089 continue; 2090 } 2091 if (blen == -1) 2092 blen = in6_matchlen(&best_ia->ia_addr.sin6_addr, dst); 2093 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2094 if (tlen > blen) { 2095 blen = tlen; 2096 best_ia = ia; 2097 } else if (tlen == blen) 2098 best_ia = bestia(best_ia, ia); 2099 } 2100 if (best_ia != NULL) 2101 return best_ia; 2102 2103 IFADDR_READER_FOREACH(ifa, ifp) { 2104 if (ifa->ifa_addr->sa_family != AF_INET6) 2105 continue; 2106 ia = (struct in6_ifaddr *)ifa; 2107 if (ia->ia6_flags & IN6_IFF_ANYCAST) 2108 continue; /* XXX: is there any case to allow anycast? */ 2109 if (ia->ia6_flags & IN6_IFF_NOTREADY) 2110 continue; /* don't use this interface */ 2111 if (ia->ia6_flags & IN6_IFF_DETACHED) 2112 continue; 2113 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2114 if (ip6_use_deprecated) 2115 dep[1] = (struct in6_ifaddr *)ifa; 2116 continue; 2117 } 2118 2119 best_ia = bestia(best_ia, ia); 2120 } 2121 if (best_ia != NULL) 2122 return best_ia; 2123 2124 /* use the last-resort values, that are, deprecated addresses */ 2125 if (dep[0]) 2126 return dep[0]; 2127 if (dep[1]) 2128 return dep[1]; 2129 2130 return NULL; 2131 } 2132 2133 /* 2134 * perform DAD when interface becomes IFF_UP. 2135 */ 2136 void 2137 in6_if_link_up(struct ifnet *ifp) 2138 { 2139 struct ifaddr *ifa; 2140 struct in6_ifaddr *ia; 2141 int s, bound; 2142 char ip6buf[INET6_ADDRSTRLEN]; 2143 2144 /* Ensure it's sane to run DAD */ 2145 if (ifp->if_link_state == LINK_STATE_DOWN) 2146 return; 2147 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 2148 return; 2149 2150 bound = curlwp_bind(); 2151 s = pserialize_read_enter(); 2152 IFADDR_READER_FOREACH(ifa, ifp) { 2153 struct psref psref; 2154 2155 if (ifa->ifa_addr->sa_family != AF_INET6) 2156 continue; 2157 2158 ifa_acquire(ifa, &psref); 2159 pserialize_read_exit(s); 2160 ia = (struct in6_ifaddr *)ifa; 2161 2162 /* If detached then mark as tentative */ 2163 if (ia->ia6_flags & IN6_IFF_DETACHED) { 2164 ia->ia6_flags &= ~IN6_IFF_DETACHED; 2165 if (if_do_dad(ifp)) { 2166 ia->ia6_flags |= IN6_IFF_TENTATIVE; 2167 nd6log(LOG_ERR, "%s marked tentative\n", 2168 IN6_PRINT(ip6buf, 2169 &ia->ia_addr.sin6_addr)); 2170 } else if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) 2171 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 2172 } 2173 2174 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2175 int rand_delay; 2176 2177 /* Clear the duplicated flag as we're starting DAD. */ 2178 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; 2179 2180 /* 2181 * The TENTATIVE flag was likely set by hand 2182 * beforehand, implicitly indicating the need for DAD. 2183 * We may be able to skip the random delay in this 2184 * case, but we impose delays just in case. 2185 */ 2186 rand_delay = cprng_fast32() % 2187 (MAX_RTR_SOLICITATION_DELAY * hz); 2188 /* +1 ensures callout is always used */ 2189 nd6_dad_start(ifa, rand_delay + 1); 2190 } 2191 2192 s = pserialize_read_enter(); 2193 ifa_release(ifa, &psref); 2194 } 2195 pserialize_read_exit(s); 2196 curlwp_bindx(bound); 2197 2198 /* Restore any detached prefixes */ 2199 ND6_WLOCK(); 2200 nd6_pfxlist_onlink_check(); 2201 ND6_UNLOCK(); 2202 } 2203 2204 void 2205 in6_if_up(struct ifnet *ifp) 2206 { 2207 2208 /* 2209 * special cases, like 6to4, are handled in in6_ifattach 2210 */ 2211 in6_ifattach(ifp, NULL); 2212 2213 /* interface may not support link state, so bring it up also */ 2214 in6_if_link_up(ifp); 2215 } 2216 2217 /* 2218 * Mark all addresses as detached. 2219 */ 2220 void 2221 in6_if_link_down(struct ifnet *ifp) 2222 { 2223 struct ifaddr *ifa; 2224 struct in6_ifaddr *ia; 2225 int s, bound; 2226 char ip6buf[INET6_ADDRSTRLEN]; 2227 2228 /* Any prefixes on this interface should be detached as well */ 2229 ND6_WLOCK(); 2230 nd6_pfxlist_onlink_check(); 2231 ND6_UNLOCK(); 2232 2233 bound = curlwp_bind(); 2234 s = pserialize_read_enter(); 2235 IFADDR_READER_FOREACH(ifa, ifp) { 2236 struct psref psref; 2237 2238 if (ifa->ifa_addr->sa_family != AF_INET6) 2239 continue; 2240 2241 ifa_acquire(ifa, &psref); 2242 pserialize_read_exit(s); 2243 ia = (struct in6_ifaddr *)ifa; 2244 2245 /* Stop DAD processing */ 2246 nd6_dad_stop(ifa); 2247 2248 /* 2249 * Mark the address as detached. 2250 * This satisfies RFC4862 Section 5.3, but we should apply 2251 * this logic to all addresses to be a good citizen and 2252 * avoid potential duplicated addresses. 2253 * When the interface comes up again, detached addresses 2254 * are marked tentative and DAD commences. 2255 */ 2256 if (!(ia->ia6_flags & IN6_IFF_DETACHED)) { 2257 nd6log(LOG_DEBUG, "%s marked detached\n", 2258 IN6_PRINT(ip6buf, &ia->ia_addr.sin6_addr)); 2259 ia->ia6_flags |= IN6_IFF_DETACHED; 2260 ia->ia6_flags &= 2261 ~(IN6_IFF_TENTATIVE | IN6_IFF_DUPLICATED); 2262 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 2263 } 2264 2265 s = pserialize_read_enter(); 2266 ifa_release(ifa, &psref); 2267 } 2268 pserialize_read_exit(s); 2269 curlwp_bindx(bound); 2270 } 2271 2272 void 2273 in6_if_down(struct ifnet *ifp) 2274 { 2275 2276 in6_if_link_down(ifp); 2277 lltable_purge_entries(LLTABLE6(ifp)); 2278 } 2279 2280 void 2281 in6_if_link_state_change(struct ifnet *ifp, int link_state) 2282 { 2283 2284 switch (link_state) { 2285 case LINK_STATE_DOWN: 2286 in6_if_link_down(ifp); 2287 break; 2288 case LINK_STATE_UP: 2289 in6_if_link_up(ifp); 2290 break; 2291 } 2292 } 2293 2294 /* 2295 * Calculate max IPv6 MTU through all the interfaces and store it 2296 * to in6_maxmtu. 2297 */ 2298 void 2299 in6_setmaxmtu(void) 2300 { 2301 unsigned long maxmtu = 0; 2302 struct ifnet *ifp; 2303 int s; 2304 2305 s = pserialize_read_enter(); 2306 IFNET_READER_FOREACH(ifp) { 2307 /* this function can be called during ifnet initialization */ 2308 if (!ifp->if_afdata[AF_INET6]) 2309 continue; 2310 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2311 IN6_LINKMTU(ifp) > maxmtu) 2312 maxmtu = IN6_LINKMTU(ifp); 2313 } 2314 pserialize_read_exit(s); 2315 if (maxmtu) /* update only when maxmtu is positive */ 2316 in6_maxmtu = maxmtu; 2317 } 2318 2319 /* 2320 * Provide the length of interface identifiers to be used for the link attached 2321 * to the given interface. The length should be defined in "IPv6 over 2322 * xxx-link" document. Note that address architecture might also define 2323 * the length for a particular set of address prefixes, regardless of the 2324 * link type. As clarified in rfc2462bis, those two definitions should be 2325 * consistent, and those really are as of August 2004. 2326 */ 2327 int 2328 in6_if2idlen(struct ifnet *ifp) 2329 { 2330 switch (ifp->if_type) { 2331 case IFT_ETHER: /* RFC2464 */ 2332 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2333 case IFT_L2VLAN: /* ditto */ 2334 case IFT_IEEE80211: /* ditto */ 2335 case IFT_FDDI: /* RFC2467 */ 2336 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 2337 case IFT_PPP: /* RFC2472 */ 2338 case IFT_ARCNET: /* RFC2497 */ 2339 case IFT_FRELAY: /* RFC2590 */ 2340 case IFT_IEEE1394: /* RFC3146 */ 2341 case IFT_GIF: /* draft-ietf-v6ops-mech-v2-07 */ 2342 case IFT_LOOP: /* XXX: is this really correct? */ 2343 return 64; 2344 default: 2345 /* 2346 * Unknown link type: 2347 * It might be controversial to use the today's common constant 2348 * of 64 for these cases unconditionally. For full compliance, 2349 * we should return an error in this case. On the other hand, 2350 * if we simply miss the standard for the link type or a new 2351 * standard is defined for a new link type, the IFID length 2352 * is very likely to be the common constant. As a compromise, 2353 * we always use the constant, but make an explicit notice 2354 * indicating the "unknown" case. 2355 */ 2356 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2357 return 64; 2358 } 2359 } 2360 2361 struct in6_llentry { 2362 struct llentry base; 2363 }; 2364 2365 #define IN6_LLTBL_DEFAULT_HSIZE 32 2366 #define IN6_LLTBL_HASH(k, h) \ 2367 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 2368 2369 /* 2370 * Do actual deallocation of @lle. 2371 * Called by LLE_FREE_LOCKED when number of references 2372 * drops to zero. 2373 */ 2374 static void 2375 in6_lltable_destroy_lle(struct llentry *lle) 2376 { 2377 2378 LLE_WUNLOCK(lle); 2379 LLE_LOCK_DESTROY(lle); 2380 kmem_intr_free(lle, sizeof(struct in6_llentry)); 2381 } 2382 2383 static struct llentry * 2384 in6_lltable_new(const struct in6_addr *addr6, u_int flags) 2385 { 2386 struct in6_llentry *lle; 2387 2388 lle = kmem_intr_zalloc(sizeof(struct in6_llentry), KM_NOSLEEP); 2389 if (lle == NULL) /* NB: caller generates msg */ 2390 return NULL; 2391 2392 lle->base.r_l3addr.addr6 = *addr6; 2393 lle->base.lle_refcnt = 1; 2394 lle->base.lle_free = in6_lltable_destroy_lle; 2395 LLE_LOCK_INIT(&lle->base); 2396 callout_init(&lle->base.lle_timer, CALLOUT_MPSAFE); 2397 2398 return &lle->base; 2399 } 2400 2401 static int 2402 in6_lltable_match_prefix(const struct sockaddr *prefix, 2403 const struct sockaddr *mask, u_int flags, struct llentry *lle) 2404 { 2405 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix; 2406 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask; 2407 2408 if (IN6_ARE_MASKED_ADDR_EQUAL(&lle->r_l3addr.addr6, 2409 &pfx->sin6_addr, &msk->sin6_addr) && 2410 ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) 2411 return 1; 2412 2413 return 0; 2414 } 2415 2416 static void 2417 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle) 2418 { 2419 struct ifnet *ifp = llt->llt_ifp; 2420 bool locked = false; 2421 2422 LLE_WLOCK_ASSERT(lle); 2423 2424 /* Unlink entry from table */ 2425 if ((lle->la_flags & LLE_LINKED) != 0) { 2426 IF_AFDATA_WLOCK_ASSERT(ifp); 2427 lltable_unlink_entry(llt, lle); 2428 KASSERT((lle->la_flags & LLE_LINKED) == 0); 2429 locked = true; 2430 } 2431 /* 2432 * We need to release the lock here to lle_timer proceeds; 2433 * lle_timer should stop immediately if LLE_LINKED isn't set. 2434 * Note that we cannot pass lle->lle_lock to callout_halt 2435 * because it's a rwlock. 2436 */ 2437 LLE_ADDREF(lle); 2438 LLE_WUNLOCK(lle); 2439 if (locked) 2440 IF_AFDATA_WUNLOCK(ifp); 2441 2442 #ifdef NET_MPSAFE 2443 callout_halt(&lle->lle_timer, NULL); 2444 #else 2445 if (mutex_owned(softnet_lock)) 2446 callout_halt(&lle->lle_timer, softnet_lock); 2447 else 2448 callout_halt(&lle->lle_timer, NULL); 2449 #endif 2450 LLE_WLOCK(lle); 2451 LLE_REMREF(lle); 2452 2453 lltable_drop_entry_queue(lle); 2454 LLE_FREE_LOCKED(lle); 2455 2456 if (locked) 2457 IF_AFDATA_WLOCK(ifp); 2458 } 2459 2460 static int 2461 in6_lltable_rtcheck(struct ifnet *ifp, u_int flags, 2462 const struct sockaddr *l3addr, const struct rtentry *rt) 2463 { 2464 char ip6buf[INET6_ADDRSTRLEN]; 2465 2466 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 2467 int s; 2468 struct ifaddr *ifa; 2469 /* 2470 * Create an ND6 cache for an IPv6 neighbor 2471 * that is not covered by our own prefix. 2472 */ 2473 /* XXX ifaof_ifpforaddr should take a const param */ 2474 s = pserialize_read_enter(); 2475 ifa = ifaof_ifpforaddr(l3addr, ifp); 2476 if (ifa != NULL) { 2477 pserialize_read_exit(s); 2478 return 0; 2479 } 2480 pserialize_read_exit(s); 2481 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2482 IN6_PRINT(ip6buf, 2483 &((const struct sockaddr_in6 *)l3addr)->sin6_addr)); 2484 return EINVAL; 2485 } 2486 return 0; 2487 } 2488 2489 static inline uint32_t 2490 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize) 2491 { 2492 2493 return IN6_LLTBL_HASH(dst->s6_addr32[3], hsize); 2494 } 2495 2496 static uint32_t 2497 in6_lltable_hash(const struct llentry *lle, uint32_t hsize) 2498 { 2499 2500 return in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize); 2501 } 2502 2503 static void 2504 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 2505 { 2506 struct sockaddr_in6 *sin6; 2507 2508 sin6 = (struct sockaddr_in6 *)sa; 2509 bzero(sin6, sizeof(*sin6)); 2510 sin6->sin6_family = AF_INET6; 2511 sin6->sin6_len = sizeof(*sin6); 2512 sin6->sin6_addr = lle->r_l3addr.addr6; 2513 } 2514 2515 static inline struct llentry * 2516 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst) 2517 { 2518 struct llentry *lle; 2519 struct llentries *lleh; 2520 u_int hashidx; 2521 2522 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize); 2523 lleh = &llt->lle_head[hashidx]; 2524 LIST_FOREACH(lle, lleh, lle_next) { 2525 if (lle->la_flags & LLE_DELETED) 2526 continue; 2527 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst)) 2528 break; 2529 } 2530 2531 return lle; 2532 } 2533 2534 static int 2535 in6_lltable_delete(struct lltable *llt, u_int flags, 2536 const struct sockaddr *l3addr) 2537 { 2538 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2539 struct llentry *lle; 2540 2541 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp); 2542 KASSERTMSG(l3addr->sa_family == AF_INET6, 2543 "sin_family %d", l3addr->sa_family); 2544 2545 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2546 2547 if (lle == NULL) { 2548 #ifdef DEBUG 2549 char buf[64]; 2550 sockaddr_format(l3addr, buf, sizeof(buf)); 2551 log(LOG_INFO, "%s: cache for %s is not found\n", 2552 __func__, buf); 2553 #endif 2554 return ENOENT; 2555 } 2556 2557 LLE_WLOCK(lle); 2558 lle->la_flags |= LLE_DELETED; 2559 #ifdef DEBUG 2560 { 2561 char buf[64]; 2562 sockaddr_format(l3addr, buf, sizeof(buf)); 2563 log(LOG_INFO, "%s: cache for %s (%p) is deleted\n", 2564 __func__, buf, lle); 2565 } 2566 #endif 2567 if ((lle->la_flags & (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC) 2568 llentry_free(lle); 2569 else 2570 LLE_WUNLOCK(lle); 2571 2572 return 0; 2573 } 2574 2575 static struct llentry * 2576 in6_lltable_create(struct lltable *llt, u_int flags, 2577 const struct sockaddr *l3addr, const struct rtentry *rt) 2578 { 2579 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2580 struct ifnet *ifp = llt->llt_ifp; 2581 struct llentry *lle; 2582 2583 IF_AFDATA_WLOCK_ASSERT(ifp); 2584 KASSERTMSG(l3addr->sa_family == AF_INET6, 2585 "sin_family %d", l3addr->sa_family); 2586 2587 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2588 2589 if (lle != NULL) { 2590 LLE_WLOCK(lle); 2591 return lle; 2592 } 2593 2594 /* 2595 * A route that covers the given address must have 2596 * been installed 1st because we are doing a resolution, 2597 * verify this. 2598 */ 2599 if (!(flags & LLE_IFADDR) && 2600 in6_lltable_rtcheck(ifp, flags, l3addr, rt) != 0) 2601 return NULL; 2602 2603 lle = in6_lltable_new(&sin6->sin6_addr, flags); 2604 if (lle == NULL) { 2605 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2606 return NULL; 2607 } 2608 lle->la_flags = flags; 2609 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 2610 memcpy(&lle->ll_addr, CLLADDR(ifp->if_sadl), ifp->if_addrlen); 2611 lle->la_flags |= LLE_VALID; 2612 } 2613 2614 lltable_link_entry(llt, lle); 2615 LLE_WLOCK(lle); 2616 2617 return lle; 2618 } 2619 2620 static struct llentry * 2621 in6_lltable_lookup(struct lltable *llt, u_int flags, 2622 const struct sockaddr *l3addr) 2623 { 2624 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2625 struct llentry *lle; 2626 2627 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 2628 KASSERTMSG(l3addr->sa_family == AF_INET6, 2629 "sin_family %d", l3addr->sa_family); 2630 2631 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2632 2633 if (lle == NULL) 2634 return NULL; 2635 2636 if (flags & LLE_EXCLUSIVE) 2637 LLE_WLOCK(lle); 2638 else 2639 LLE_RLOCK(lle); 2640 return lle; 2641 } 2642 2643 static int 2644 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 2645 struct rt_walkarg *w) 2646 { 2647 struct sockaddr_in6 sin6; 2648 2649 LLTABLE_LOCK_ASSERT(); 2650 2651 /* skip deleted entries */ 2652 if (lle->la_flags & LLE_DELETED) 2653 return 0; 2654 2655 sockaddr_in6_init(&sin6, &lle->r_l3addr.addr6, 0, 0, 0); 2656 2657 return lltable_dump_entry(llt, lle, w, sin6tosa(&sin6)); 2658 } 2659 2660 static struct lltable * 2661 in6_lltattach(struct ifnet *ifp) 2662 { 2663 struct lltable *llt; 2664 2665 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE); 2666 llt->llt_af = AF_INET6; 2667 llt->llt_ifp = ifp; 2668 2669 llt->llt_lookup = in6_lltable_lookup; 2670 llt->llt_create = in6_lltable_create; 2671 llt->llt_delete = in6_lltable_delete; 2672 llt->llt_dump_entry = in6_lltable_dump_entry; 2673 llt->llt_hash = in6_lltable_hash; 2674 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry; 2675 llt->llt_free_entry = in6_lltable_free_entry; 2676 llt->llt_match_prefix = in6_lltable_match_prefix; 2677 lltable_link(llt); 2678 2679 return llt; 2680 } 2681 2682 void * 2683 in6_domifattach(struct ifnet *ifp) 2684 { 2685 struct in6_ifextra *ext; 2686 2687 ext = malloc(sizeof(*ext), M_IFADDR, M_WAITOK|M_ZERO); 2688 2689 ext->in6_ifstat = malloc(sizeof(struct in6_ifstat), 2690 M_IFADDR, M_WAITOK|M_ZERO); 2691 2692 ext->icmp6_ifstat = malloc(sizeof(struct icmp6_ifstat), 2693 M_IFADDR, M_WAITOK|M_ZERO); 2694 2695 ext->nd_ifinfo = nd6_ifattach(ifp); 2696 ext->scope6_id = scope6_ifattach(ifp); 2697 ext->nprefixes = 0; 2698 ext->ndefrouters = 0; 2699 2700 ext->lltable = in6_lltattach(ifp); 2701 2702 return ext; 2703 } 2704 2705 void 2706 in6_domifdetach(struct ifnet *ifp, void *aux) 2707 { 2708 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2709 2710 lltable_free(ext->lltable); 2711 ext->lltable = NULL; 2712 #ifndef NET_MPSAFE 2713 mutex_enter(softnet_lock); 2714 #endif 2715 nd6_ifdetach(ifp, ext); 2716 #ifndef NET_MPSAFE 2717 mutex_exit(softnet_lock); 2718 #endif 2719 free(ext->in6_ifstat, M_IFADDR); 2720 free(ext->icmp6_ifstat, M_IFADDR); 2721 scope6_ifdetach(ext->scope6_id); 2722 free(ext, M_IFADDR); 2723 } 2724 2725 /* 2726 * Convert IPv4 address stored in struct in_addr to IPv4-Mapped IPv6 address 2727 * stored in struct in6_addr as defined in RFC 4921 section 2.5.5.2. 2728 */ 2729 void 2730 in6_in_2_v4mapin6(const struct in_addr *in, struct in6_addr *in6) 2731 { 2732 in6->s6_addr32[0] = 0; 2733 in6->s6_addr32[1] = 0; 2734 in6->s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2735 in6->s6_addr32[3] = in->s_addr; 2736 } 2737 2738 /* 2739 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2740 * v4 mapped addr or v4 compat addr 2741 */ 2742 void 2743 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2744 { 2745 memset(sin, 0, sizeof(*sin)); 2746 sin->sin_len = sizeof(struct sockaddr_in); 2747 sin->sin_family = AF_INET; 2748 sin->sin_port = sin6->sin6_port; 2749 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2750 } 2751 2752 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2753 void 2754 in6_sin_2_v4mapsin6(const struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2755 { 2756 memset(sin6, 0, sizeof(*sin6)); 2757 sin6->sin6_len = sizeof(struct sockaddr_in6); 2758 sin6->sin6_family = AF_INET6; 2759 sin6->sin6_port = sin->sin_port; 2760 in6_in_2_v4mapin6(&sin->sin_addr, &sin6->sin6_addr); 2761 } 2762 2763 /* Convert sockaddr_in6 into sockaddr_in. */ 2764 void 2765 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2766 { 2767 struct sockaddr_in *sin_p; 2768 struct sockaddr_in6 sin6; 2769 2770 /* 2771 * Save original sockaddr_in6 addr and convert it 2772 * to sockaddr_in. 2773 */ 2774 sin6 = *(struct sockaddr_in6 *)nam; 2775 sin_p = (struct sockaddr_in *)nam; 2776 in6_sin6_2_sin(sin_p, &sin6); 2777 } 2778 2779 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2780 void 2781 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2782 { 2783 struct sockaddr_in *sin_p; 2784 struct sockaddr_in6 *sin6_p; 2785 2786 sin6_p = malloc(sizeof(*sin6_p), M_SONAME, M_WAITOK); 2787 sin_p = (struct sockaddr_in *)*nam; 2788 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2789 free(*nam, M_SONAME); 2790 *nam = sin6tosa(sin6_p); 2791 } 2792
Indexes created Sun Sep 21 15:09:59 GMT 2025