in6.c revision 1.210
1 /* $NetBSD: in6.c,v 1.210 2016/07/20 07:37:51 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 1.210 2016/07/20 07:37:51 ozaki-r Exp $"); 66 67 #ifdef _KERNEL_OPT 68 #include "opt_inet.h" 69 #include "opt_compat_netbsd.h" 70 #endif 71 72 #include <sys/param.h> 73 #include <sys/ioctl.h> 74 #include <sys/errno.h> 75 #include <sys/malloc.h> 76 #include <sys/socket.h> 77 #include <sys/socketvar.h> 78 #include <sys/sockio.h> 79 #include <sys/systm.h> 80 #include <sys/proc.h> 81 #include <sys/time.h> 82 #include <sys/kernel.h> 83 #include <sys/syslog.h> 84 #include <sys/kauth.h> 85 #include <sys/cprng.h> 86 #include <sys/kmem.h> 87 88 #include <net/if.h> 89 #include <net/if_types.h> 90 #include <net/if_llatbl.h> 91 #include <net/if_ether.h> 92 #include <net/if_dl.h> 93 #include <net/pfil.h> 94 #include <net/route.h> 95 96 #include <netinet/in.h> 97 #include <netinet/in_var.h> 98 99 #include <netinet/ip6.h> 100 #include <netinet6/ip6_var.h> 101 #include <netinet6/nd6.h> 102 #include <netinet6/mld6_var.h> 103 #include <netinet6/ip6_mroute.h> 104 #include <netinet6/in6_ifattach.h> 105 #include <netinet6/scope6_var.h> 106 107 #include <net/net_osdep.h> 108 109 #ifdef COMPAT_50 110 #include <compat/netinet6/in6_var.h> 111 #endif 112 113 MALLOC_DEFINE(M_IP6OPT, "ip6_options", "IPv6 options"); 114 115 /* enable backward compatibility code for obsoleted ioctls */ 116 #define COMPAT_IN6IFIOCTL 117 118 #ifdef IN6_DEBUG 119 #define IN6_DPRINTF(__fmt, ...) printf(__fmt, __VA_ARGS__) 120 #else 121 #define IN6_DPRINTF(__fmt, ...) do { } while (/*CONSTCOND*/0) 122 #endif /* IN6_DEBUG */ 123 124 /* 125 * Definitions of some constant IP6 addresses. 126 */ 127 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 128 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 129 const struct in6_addr in6addr_nodelocal_allnodes = 130 IN6ADDR_NODELOCAL_ALLNODES_INIT; 131 const struct in6_addr in6addr_linklocal_allnodes = 132 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 133 const struct in6_addr in6addr_linklocal_allrouters = 134 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 135 136 const struct in6_addr in6mask0 = IN6MASK0; 137 const struct in6_addr in6mask32 = IN6MASK32; 138 const struct in6_addr in6mask64 = IN6MASK64; 139 const struct in6_addr in6mask96 = IN6MASK96; 140 const struct in6_addr in6mask128 = IN6MASK128; 141 142 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6, 143 0, 0, IN6ADDR_ANY_INIT, 0}; 144 145 struct pslist_head in6_ifaddr_list; 146 147 static int in6_lifaddr_ioctl(struct socket *, u_long, void *, 148 struct ifnet *); 149 static int in6_ifinit(struct ifnet *, struct in6_ifaddr *, 150 const struct sockaddr_in6 *, int); 151 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 152 153 void 154 in6_init(void) 155 { 156 157 PSLIST_INIT(&in6_ifaddr_list); 158 } 159 160 /* 161 * Add ownaddr as loopback rtentry. We previously add the route only if 162 * necessary (ex. on a p2p link). However, since we now manage addresses 163 * separately from prefixes, we should always add the route. We can't 164 * rely on the cloning mechanism from the corresponding interface route 165 * any more. 166 */ 167 void 168 in6_ifaddlocal(struct ifaddr *ifa) 169 { 170 171 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &in6addr_any) || 172 (ifa->ifa_ifp->if_flags & IFF_POINTOPOINT && 173 IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), IFA_DSTIN6(ifa)))) 174 { 175 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 176 return; 177 } 178 179 rt_ifa_addlocal(ifa); 180 } 181 182 /* 183 * Remove loopback rtentry of ownaddr generated by in6_ifaddlocal(), 184 * if it exists. 185 */ 186 void 187 in6_ifremlocal(struct ifaddr *ifa) 188 { 189 struct in6_ifaddr *ia; 190 struct ifaddr *alt_ifa = NULL; 191 int ia_count = 0; 192 193 /* 194 * Some of BSD variants do not remove cloned routes 195 * from an interface direct route, when removing the direct route 196 * (see comments in net/net_osdep.h). Even for variants that do remove 197 * cloned routes, they could fail to remove the cloned routes when 198 * we handle multple addresses that share a common prefix. 199 * So, we should remove the route corresponding to the deleted address. 200 */ 201 202 /* 203 * Delete the entry only if exactly one ifaddr matches the 204 * address, ifa->ifa_addr. 205 * 206 * If more than one ifaddr matches, replace the ifaddr in 207 * the routing table, rt_ifa, with a different ifaddr than 208 * the one we are purging, ifa. It is important to do 209 * this, or else the routing table can accumulate dangling 210 * pointers rt->rt_ifa->ifa_ifp to destroyed interfaces, 211 * which will lead to crashes, later. (More than one ifaddr 212 * can match if we assign the same address to multiple---probably 213 * p2p---interfaces.) 214 * 215 * XXX An old comment at this place said, "we should avoid 216 * XXX such a configuration [i.e., interfaces with the same 217 * XXX addressed assigned --ed.] in IPv6...". I do not 218 * XXX agree, especially now that I have fixed the dangling 219 * XXX ifp-pointers bug. 220 */ 221 IN6_ADDRLIST_READER_FOREACH(ia) { 222 if (!IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) 223 continue; 224 if (ia->ia_ifp != ifa->ifa_ifp) 225 alt_ifa = &ia->ia_ifa; 226 if (++ia_count > 1 && alt_ifa != NULL) 227 break; 228 } 229 230 if (ia_count == 0) 231 return; 232 233 rt_ifa_remlocal(ifa, ia_count == 1 ? NULL : alt_ifa); 234 } 235 236 int 237 in6_mask2len(struct in6_addr *mask, u_char *lim0) 238 { 239 int x = 0, y; 240 u_char *lim = lim0, *p; 241 242 /* ignore the scope_id part */ 243 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 244 lim = (u_char *)mask + sizeof(*mask); 245 for (p = (u_char *)mask; p < lim; x++, p++) { 246 if (*p != 0xff) 247 break; 248 } 249 y = 0; 250 if (p < lim) { 251 for (y = 0; y < NBBY; y++) { 252 if ((*p & (0x80 >> y)) == 0) 253 break; 254 } 255 } 256 257 /* 258 * when the limit pointer is given, do a stricter check on the 259 * remaining bits. 260 */ 261 if (p < lim) { 262 if (y != 0 && (*p & (0x00ff >> y)) != 0) 263 return -1; 264 for (p = p + 1; p < lim; p++) 265 if (*p != 0) 266 return -1; 267 } 268 269 return x * NBBY + y; 270 } 271 272 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 273 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 274 275 static int 276 in6_control1(struct socket *so, u_long cmd, void *data, struct ifnet *ifp) 277 { 278 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 279 struct in6_ifaddr *ia = NULL; 280 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 281 struct sockaddr_in6 *sa6; 282 int error; 283 284 switch (cmd) { 285 case SIOCAADDRCTL_POLICY: 286 case SIOCDADDRCTL_POLICY: 287 /* Privileged. */ 288 return in6_src_ioctl(cmd, data); 289 /* 290 * XXX: Fix me, once we fix SIOCSIFADDR, SIOCIFDSTADDR, etc. 291 */ 292 case SIOCSIFADDR: 293 case SIOCSIFDSTADDR: 294 case SIOCSIFBRDADDR: 295 case SIOCSIFNETMASK: 296 return EOPNOTSUPP; 297 case SIOCGETSGCNT_IN6: 298 case SIOCGETMIFCNT_IN6: 299 return mrt6_ioctl(cmd, data); 300 case SIOCGIFADDRPREF: 301 case SIOCSIFADDRPREF: 302 if (ifp == NULL) 303 return EINVAL; 304 return ifaddrpref_ioctl(so, cmd, data, ifp); 305 } 306 307 if (ifp == NULL) 308 return EOPNOTSUPP; 309 310 switch (cmd) { 311 case SIOCSNDFLUSH_IN6: 312 case SIOCSPFXFLUSH_IN6: 313 case SIOCSRTRFLUSH_IN6: 314 case SIOCSDEFIFACE_IN6: 315 case SIOCSIFINFO_FLAGS: 316 case SIOCSIFINFO_IN6: 317 /* Privileged. */ 318 /* FALLTHROUGH */ 319 case OSIOCGIFINFO_IN6: 320 case SIOCGIFINFO_IN6: 321 case SIOCGDRLST_IN6: 322 case SIOCGPRLST_IN6: 323 case SIOCGNBRINFO_IN6: 324 case SIOCGDEFIFACE_IN6: 325 return nd6_ioctl(cmd, data, ifp); 326 } 327 328 switch (cmd) { 329 case SIOCSIFPREFIX_IN6: 330 case SIOCDIFPREFIX_IN6: 331 case SIOCAIFPREFIX_IN6: 332 case SIOCCIFPREFIX_IN6: 333 case SIOCSGIFPREFIX_IN6: 334 case SIOCGIFPREFIX_IN6: 335 log(LOG_NOTICE, 336 "prefix ioctls are now invalidated. " 337 "please use ifconfig.\n"); 338 return EOPNOTSUPP; 339 } 340 341 switch (cmd) { 342 case SIOCALIFADDR: 343 case SIOCDLIFADDR: 344 /* Privileged. */ 345 /* FALLTHROUGH */ 346 case SIOCGLIFADDR: 347 return in6_lifaddr_ioctl(so, cmd, data, ifp); 348 } 349 350 /* 351 * Find address for this interface, if it exists. 352 * 353 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 354 * only, and used the first interface address as the target of other 355 * operations (without checking ifra_addr). This was because netinet 356 * code/API assumed at most 1 interface address per interface. 357 * Since IPv6 allows a node to assign multiple addresses 358 * on a single interface, we almost always look and check the 359 * presence of ifra_addr, and reject invalid ones here. 360 * It also decreases duplicated code among SIOC*_IN6 operations. 361 */ 362 switch (cmd) { 363 case SIOCAIFADDR_IN6: 364 #ifdef OSIOCAIFADDR_IN6 365 case OSIOCAIFADDR_IN6: 366 #endif 367 #ifdef OSIOCSIFPHYADDR_IN6 368 case OSIOCSIFPHYADDR_IN6: 369 #endif 370 case SIOCSIFPHYADDR_IN6: 371 sa6 = &ifra->ifra_addr; 372 break; 373 case SIOCSIFADDR_IN6: 374 case SIOCGIFADDR_IN6: 375 case SIOCSIFDSTADDR_IN6: 376 case SIOCSIFNETMASK_IN6: 377 case SIOCGIFDSTADDR_IN6: 378 case SIOCGIFNETMASK_IN6: 379 case SIOCDIFADDR_IN6: 380 case SIOCGIFPSRCADDR_IN6: 381 case SIOCGIFPDSTADDR_IN6: 382 case SIOCGIFAFLAG_IN6: 383 case SIOCSNDFLUSH_IN6: 384 case SIOCSPFXFLUSH_IN6: 385 case SIOCSRTRFLUSH_IN6: 386 case SIOCGIFALIFETIME_IN6: 387 #ifdef OSIOCGIFALIFETIME_IN6 388 case OSIOCGIFALIFETIME_IN6: 389 #endif 390 case SIOCGIFSTAT_IN6: 391 case SIOCGIFSTAT_ICMP6: 392 sa6 = &ifr->ifr_addr; 393 break; 394 default: 395 sa6 = NULL; 396 break; 397 } 398 if (sa6 && sa6->sin6_family == AF_INET6) { 399 if (sa6->sin6_scope_id != 0) 400 error = sa6_embedscope(sa6, 0); 401 else 402 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 403 if (error != 0) 404 return error; 405 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 406 } else 407 ia = NULL; 408 409 switch (cmd) { 410 case SIOCSIFADDR_IN6: 411 case SIOCSIFDSTADDR_IN6: 412 case SIOCSIFNETMASK_IN6: 413 /* 414 * Since IPv6 allows a node to assign multiple addresses 415 * on a single interface, SIOCSIFxxx ioctls are deprecated. 416 */ 417 return EINVAL; 418 419 case SIOCDIFADDR_IN6: 420 /* 421 * for IPv4, we look for existing in_ifaddr here to allow 422 * "ifconfig if0 delete" to remove the first IPv4 address on 423 * the interface. For IPv6, as the spec allows multiple 424 * interface address from the day one, we consider "remove the 425 * first one" semantics to be not preferable. 426 */ 427 if (ia == NULL) 428 return EADDRNOTAVAIL; 429 /* FALLTHROUGH */ 430 #ifdef OSIOCAIFADDR_IN6 431 case OSIOCAIFADDR_IN6: 432 #endif 433 case SIOCAIFADDR_IN6: 434 /* 435 * We always require users to specify a valid IPv6 address for 436 * the corresponding operation. 437 */ 438 if (ifra->ifra_addr.sin6_family != AF_INET6 || 439 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) 440 return EAFNOSUPPORT; 441 /* Privileged. */ 442 443 break; 444 445 case SIOCGIFADDR_IN6: 446 /* This interface is basically deprecated. use SIOCGIFCONF. */ 447 /* FALLTHROUGH */ 448 case SIOCGIFAFLAG_IN6: 449 case SIOCGIFNETMASK_IN6: 450 case SIOCGIFDSTADDR_IN6: 451 case SIOCGIFALIFETIME_IN6: 452 #ifdef OSIOCGIFALIFETIME_IN6 453 case OSIOCGIFALIFETIME_IN6: 454 #endif 455 /* must think again about its semantics */ 456 if (ia == NULL) 457 return EADDRNOTAVAIL; 458 break; 459 } 460 461 switch (cmd) { 462 463 case SIOCGIFADDR_IN6: 464 ifr->ifr_addr = ia->ia_addr; 465 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 466 return error; 467 break; 468 469 case SIOCGIFDSTADDR_IN6: 470 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 471 return EINVAL; 472 /* 473 * XXX: should we check if ifa_dstaddr is NULL and return 474 * an error? 475 */ 476 ifr->ifr_dstaddr = ia->ia_dstaddr; 477 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 478 return error; 479 break; 480 481 case SIOCGIFNETMASK_IN6: 482 ifr->ifr_addr = ia->ia_prefixmask; 483 break; 484 485 case SIOCGIFAFLAG_IN6: 486 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 487 break; 488 489 case SIOCGIFSTAT_IN6: 490 if (ifp == NULL) 491 return EINVAL; 492 memset(&ifr->ifr_ifru.ifru_stat, 0, 493 sizeof(ifr->ifr_ifru.ifru_stat)); 494 ifr->ifr_ifru.ifru_stat = 495 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat; 496 break; 497 498 case SIOCGIFSTAT_ICMP6: 499 if (ifp == NULL) 500 return EINVAL; 501 memset(&ifr->ifr_ifru.ifru_icmp6stat, 0, 502 sizeof(ifr->ifr_ifru.ifru_icmp6stat)); 503 ifr->ifr_ifru.ifru_icmp6stat = 504 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat; 505 break; 506 507 #ifdef OSIOCGIFALIFETIME_IN6 508 case OSIOCGIFALIFETIME_IN6: 509 #endif 510 case SIOCGIFALIFETIME_IN6: 511 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 512 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 513 time_t maxexpire; 514 struct in6_addrlifetime *retlt = 515 &ifr->ifr_ifru.ifru_lifetime; 516 517 /* 518 * XXX: adjust expiration time assuming time_t is 519 * signed. 520 */ 521 maxexpire = ((time_t)~0) & 522 ~((time_t)1 << ((sizeof(maxexpire) * NBBY) - 1)); 523 if (ia->ia6_lifetime.ia6t_vltime < 524 maxexpire - ia->ia6_updatetime) { 525 retlt->ia6t_expire = ia->ia6_updatetime + 526 ia->ia6_lifetime.ia6t_vltime; 527 retlt->ia6t_expire = retlt->ia6t_expire ? 528 time_mono_to_wall(retlt->ia6t_expire) : 529 0; 530 } else 531 retlt->ia6t_expire = maxexpire; 532 } 533 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 534 time_t maxexpire; 535 struct in6_addrlifetime *retlt = 536 &ifr->ifr_ifru.ifru_lifetime; 537 538 /* 539 * XXX: adjust expiration time assuming time_t is 540 * signed. 541 */ 542 maxexpire = ((time_t)~0) & 543 ~((time_t)1 << ((sizeof(maxexpire) * NBBY) - 1)); 544 if (ia->ia6_lifetime.ia6t_pltime < 545 maxexpire - ia->ia6_updatetime) { 546 retlt->ia6t_preferred = ia->ia6_updatetime + 547 ia->ia6_lifetime.ia6t_pltime; 548 retlt->ia6t_preferred = retlt->ia6t_preferred ? 549 time_mono_to_wall(retlt->ia6t_preferred) : 550 0; 551 } else 552 retlt->ia6t_preferred = maxexpire; 553 } 554 #ifdef OSIOCFIFALIFETIME_IN6 555 if (cmd == OSIOCFIFALIFETIME_IN6) 556 in6_addrlifetime_to_in6_addrlifetime50( 557 &ifr->ifru.ifru_lifetime); 558 #endif 559 break; 560 561 #ifdef OSIOCAIFADDR_IN6 562 case OSIOCAIFADDR_IN6: 563 in6_aliasreq50_to_in6_aliasreq(ifra); 564 /*FALLTHROUGH*/ 565 #endif 566 case SIOCAIFADDR_IN6: 567 { 568 int i; 569 struct nd_prefixctl prc0; 570 struct nd_prefix *pr; 571 struct in6_addrlifetime *lt; 572 573 /* reject read-only flags */ 574 if ((ifra->ifra_flags & IN6_IFF_DUPLICATED) != 0 || 575 (ifra->ifra_flags & IN6_IFF_DETACHED) != 0 || 576 (ifra->ifra_flags & IN6_IFF_TENTATIVE) != 0 || 577 (ifra->ifra_flags & IN6_IFF_NODAD) != 0 || 578 (ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0) { 579 return EINVAL; 580 } 581 /* 582 * ia6t_expire and ia6t_preferred won't be used for now, 583 * so just in case. 584 */ 585 lt = &ifra->ifra_lifetime; 586 if (lt->ia6t_expire != 0) 587 lt->ia6t_expire = time_wall_to_mono(lt->ia6t_expire); 588 if (lt->ia6t_preferred != 0) 589 lt->ia6t_preferred = 590 time_wall_to_mono(lt->ia6t_preferred); 591 /* 592 * first, make or update the interface address structure, 593 * and link it to the list. 594 */ 595 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 596 return error; 597 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 598 == NULL) { 599 /* 600 * this can happen when the user specify the 0 valid 601 * lifetime. 602 */ 603 break; 604 } 605 606 /* 607 * then, make the prefix on-link on the interface. 608 * XXX: we'd rather create the prefix before the address, but 609 * we need at least one address to install the corresponding 610 * interface route, so we configure the address first. 611 */ 612 613 /* 614 * convert mask to prefix length (prefixmask has already 615 * been validated in in6_update_ifa(). 616 */ 617 memset(&prc0, 0, sizeof(prc0)); 618 prc0.ndprc_ifp = ifp; 619 prc0.ndprc_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 620 NULL); 621 if (prc0.ndprc_plen == 128) { 622 break; /* we don't need to install a host route. */ 623 } 624 prc0.ndprc_prefix = ifra->ifra_addr; 625 /* apply the mask for safety. */ 626 for (i = 0; i < 4; i++) { 627 prc0.ndprc_prefix.sin6_addr.s6_addr32[i] &= 628 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i]; 629 } 630 /* 631 * XXX: since we don't have an API to set prefix (not address) 632 * lifetimes, we just use the same lifetimes as addresses. 633 * The (temporarily) installed lifetimes can be overridden by 634 * later advertised RAs (when accept_rtadv is non 0), which is 635 * an intended behavior. 636 */ 637 prc0.ndprc_raf_onlink = 1; /* should be configurable? */ 638 prc0.ndprc_raf_auto = 639 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 640 prc0.ndprc_vltime = ifra->ifra_lifetime.ia6t_vltime; 641 prc0.ndprc_pltime = ifra->ifra_lifetime.ia6t_pltime; 642 643 /* add the prefix if not yet. */ 644 if ((pr = nd6_prefix_lookup(&prc0)) == NULL) { 645 /* 646 * nd6_prelist_add will install the corresponding 647 * interface route. 648 */ 649 if ((error = nd6_prelist_add(&prc0, NULL, &pr)) != 0) 650 return error; 651 if (pr == NULL) { 652 log(LOG_ERR, "nd6_prelist_add succeeded but " 653 "no prefix\n"); 654 return EINVAL; /* XXX panic here? */ 655 } 656 } 657 658 /* relate the address to the prefix */ 659 if (ia->ia6_ndpr == NULL) { 660 ia->ia6_ndpr = pr; 661 pr->ndpr_refcnt++; 662 663 /* 664 * If this is the first autoconf address from the 665 * prefix, create a temporary address as well 666 * (when required). 667 */ 668 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 669 ip6_use_tempaddr && pr->ndpr_refcnt == 1) { 670 int e; 671 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 672 log(LOG_NOTICE, "in6_control: failed " 673 "to create a temporary address, " 674 "errno=%d\n", e); 675 } 676 } 677 } 678 679 /* 680 * this might affect the status of autoconfigured addresses, 681 * that is, this address might make other addresses detached. 682 */ 683 pfxlist_onlink_check(); 684 685 (void)pfil_run_hooks(if_pfil, (struct mbuf **)SIOCAIFADDR_IN6, 686 ifp, PFIL_IFADDR); 687 break; 688 } 689 690 case SIOCDIFADDR_IN6: 691 { 692 struct nd_prefix *pr; 693 694 /* 695 * If the address being deleted is the only one that owns 696 * the corresponding prefix, expire the prefix as well. 697 * XXX: theoretically, we don't have to worry about such 698 * relationship, since we separate the address management 699 * and the prefix management. We do this, however, to provide 700 * as much backward compatibility as possible in terms of 701 * the ioctl operation. 702 * Note that in6_purgeaddr() will decrement ndpr_refcnt. 703 */ 704 pr = ia->ia6_ndpr; 705 in6_purgeaddr(&ia->ia_ifa); 706 if (pr && pr->ndpr_refcnt == 0) 707 prelist_remove(pr); 708 (void)pfil_run_hooks(if_pfil, (struct mbuf **)SIOCDIFADDR_IN6, 709 ifp, PFIL_IFADDR); 710 break; 711 } 712 713 default: 714 return ENOTTY; 715 } 716 717 return 0; 718 } 719 720 int 721 in6_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp) 722 { 723 int error, s; 724 725 switch (cmd) { 726 case SIOCSNDFLUSH_IN6: 727 case SIOCSPFXFLUSH_IN6: 728 case SIOCSRTRFLUSH_IN6: 729 case SIOCSDEFIFACE_IN6: 730 case SIOCSIFINFO_FLAGS: 731 case SIOCSIFINFO_IN6: 732 733 case SIOCALIFADDR: 734 case SIOCDLIFADDR: 735 736 case SIOCDIFADDR_IN6: 737 #ifdef OSIOCAIFADDR_IN6 738 case OSIOCAIFADDR_IN6: 739 #endif 740 case SIOCAIFADDR_IN6: 741 742 case SIOCAADDRCTL_POLICY: 743 case SIOCDADDRCTL_POLICY: 744 745 if (kauth_authorize_network(curlwp->l_cred, 746 KAUTH_NETWORK_SOCKET, 747 KAUTH_REQ_NETWORK_SOCKET_SETPRIV, 748 so, NULL, NULL)) 749 return EPERM; 750 break; 751 } 752 753 s = splnet(); 754 error = in6_control1(so , cmd, data, ifp); 755 splx(s); 756 return error; 757 } 758 759 /* 760 * Update parameters of an IPv6 interface address. 761 * If necessary, a new entry is created and linked into address chains. 762 * This function is separated from in6_control(). 763 * XXX: should this be performed under splnet()? 764 */ 765 static int 766 in6_update_ifa1(struct ifnet *ifp, struct in6_aliasreq *ifra, 767 struct in6_ifaddr *ia, int flags) 768 { 769 int error = 0, hostIsNew = 0, plen = -1; 770 struct sockaddr_in6 dst6; 771 struct in6_addrlifetime *lt; 772 struct in6_multi_mship *imm; 773 struct in6_multi *in6m_sol; 774 struct rtentry *rt; 775 int dad_delay, was_tentative; 776 777 in6m_sol = NULL; 778 779 /* Validate parameters */ 780 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 781 return EINVAL; 782 783 /* 784 * The destination address for a p2p link must have a family 785 * of AF_UNSPEC or AF_INET6. 786 */ 787 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 788 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 789 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 790 return EAFNOSUPPORT; 791 /* 792 * validate ifra_prefixmask. don't check sin6_family, netmask 793 * does not carry fields other than sin6_len. 794 */ 795 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 796 return EINVAL; 797 /* 798 * Because the IPv6 address architecture is classless, we require 799 * users to specify a (non 0) prefix length (mask) for a new address. 800 * We also require the prefix (when specified) mask is valid, and thus 801 * reject a non-consecutive mask. 802 */ 803 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 804 return EINVAL; 805 if (ifra->ifra_prefixmask.sin6_len != 0) { 806 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 807 (u_char *)&ifra->ifra_prefixmask + 808 ifra->ifra_prefixmask.sin6_len); 809 if (plen <= 0) 810 return EINVAL; 811 } else { 812 /* 813 * In this case, ia must not be NULL. We just use its prefix 814 * length. 815 */ 816 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 817 } 818 /* 819 * If the destination address on a p2p interface is specified, 820 * and the address is a scoped one, validate/set the scope 821 * zone identifier. 822 */ 823 dst6 = ifra->ifra_dstaddr; 824 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 825 (dst6.sin6_family == AF_INET6)) { 826 struct in6_addr in6_tmp; 827 u_int32_t zoneid; 828 829 in6_tmp = dst6.sin6_addr; 830 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 831 return EINVAL; /* XXX: should be impossible */ 832 833 if (dst6.sin6_scope_id != 0) { 834 if (dst6.sin6_scope_id != zoneid) 835 return EINVAL; 836 } else /* user omit to specify the ID. */ 837 dst6.sin6_scope_id = zoneid; 838 839 /* convert into the internal form */ 840 if (sa6_embedscope(&dst6, 0)) 841 return EINVAL; /* XXX: should be impossible */ 842 } 843 /* 844 * The destination address can be specified only for a p2p or a 845 * loopback interface. If specified, the corresponding prefix length 846 * must be 128. 847 */ 848 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 849 #ifdef FORCE_P2PPLEN 850 int i; 851 #endif 852 853 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 854 /* XXX: noisy message */ 855 nd6log(LOG_INFO, "a destination can " 856 "be specified for a p2p or a loopback IF only\n"); 857 return EINVAL; 858 } 859 if (plen != 128) { 860 nd6log(LOG_INFO, "prefixlen should " 861 "be 128 when dstaddr is specified\n"); 862 #ifdef FORCE_P2PPLEN 863 /* 864 * To be compatible with old configurations, 865 * such as ifconfig gif0 inet6 2001::1 2001::2 866 * prefixlen 126, we override the specified 867 * prefixmask as if the prefix length was 128. 868 */ 869 ifra->ifra_prefixmask.sin6_len = 870 sizeof(struct sockaddr_in6); 871 for (i = 0; i < 4; i++) 872 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i] = 873 0xffffffff; 874 plen = 128; 875 #else 876 return EINVAL; 877 #endif 878 } 879 } 880 /* lifetime consistency check */ 881 lt = &ifra->ifra_lifetime; 882 if (lt->ia6t_pltime > lt->ia6t_vltime) 883 return EINVAL; 884 if (lt->ia6t_vltime == 0) { 885 /* 886 * the following log might be noisy, but this is a typical 887 * configuration mistake or a tool's bug. 888 */ 889 nd6log(LOG_INFO, "valid lifetime is 0 for %s\n", 890 ip6_sprintf(&ifra->ifra_addr.sin6_addr)); 891 892 if (ia == NULL) 893 return 0; /* there's nothing to do */ 894 } 895 896 /* 897 * If this is a new address, allocate a new ifaddr and link it 898 * into chains. 899 */ 900 if (ia == NULL) { 901 hostIsNew = 1; 902 /* 903 * When in6_update_ifa() is called in a process of a received 904 * RA, it is called under an interrupt context. So, we should 905 * call malloc with M_NOWAIT. 906 */ 907 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR, 908 M_NOWAIT); 909 if (ia == NULL) 910 return ENOBUFS; 911 memset(ia, 0, sizeof(*ia)); 912 LIST_INIT(&ia->ia6_memberships); 913 /* Initialize the address and masks, and put time stamp */ 914 ia->ia_ifa.ifa_addr = sin6tosa(&ia->ia_addr); 915 ia->ia_addr.sin6_family = AF_INET6; 916 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 917 ia->ia6_createtime = time_uptime; 918 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 919 /* 920 * XXX: some functions expect that ifa_dstaddr is not 921 * NULL for p2p interfaces. 922 */ 923 ia->ia_ifa.ifa_dstaddr = sin6tosa(&ia->ia_dstaddr); 924 } else { 925 ia->ia_ifa.ifa_dstaddr = NULL; 926 } 927 ia->ia_ifa.ifa_netmask = sin6tosa(&ia->ia_prefixmask); 928 929 ia->ia_ifp = ifp; 930 IN6_ADDRLIST_ENTRY_INIT(ia); 931 } 932 933 /* update timestamp */ 934 ia->ia6_updatetime = time_uptime; 935 936 /* set prefix mask */ 937 if (ifra->ifra_prefixmask.sin6_len) { 938 /* 939 * We prohibit changing the prefix length of an existing 940 * address, because 941 * + such an operation should be rare in IPv6, and 942 * + the operation would confuse prefix management. 943 */ 944 if (ia->ia_prefixmask.sin6_len && 945 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 946 nd6log(LOG_INFO, "the prefix length of an" 947 " existing (%s) address should not be changed\n", 948 ip6_sprintf(&ia->ia_addr.sin6_addr)); 949 error = EINVAL; 950 if (hostIsNew) 951 free(ia, M_IFADDR); 952 goto exit; 953 } 954 ia->ia_prefixmask = ifra->ifra_prefixmask; 955 } 956 957 /* 958 * If a new destination address is specified, scrub the old one and 959 * install the new destination. Note that the interface must be 960 * p2p or loopback (see the check above.) 961 */ 962 if (dst6.sin6_family == AF_INET6 && 963 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 964 if ((ia->ia_flags & IFA_ROUTE) != 0 && 965 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0) { 966 nd6log(LOG_ERR, "failed to remove " 967 "a route to the old destination: %s\n", 968 ip6_sprintf(&ia->ia_addr.sin6_addr)); 969 /* proceed anyway... */ 970 } else 971 ia->ia_flags &= ~IFA_ROUTE; 972 ia->ia_dstaddr = dst6; 973 } 974 975 /* 976 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 977 * to see if the address is deprecated or invalidated, but initialize 978 * these members for applications. 979 */ 980 ia->ia6_lifetime = ifra->ifra_lifetime; 981 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 982 ia->ia6_lifetime.ia6t_expire = 983 time_uptime + ia->ia6_lifetime.ia6t_vltime; 984 } else 985 ia->ia6_lifetime.ia6t_expire = 0; 986 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 987 ia->ia6_lifetime.ia6t_preferred = 988 time_uptime + ia->ia6_lifetime.ia6t_pltime; 989 } else 990 ia->ia6_lifetime.ia6t_preferred = 0; 991 992 /* 993 * configure address flags. 994 * We need to preserve tentative state so DAD works if 995 * something adds the same address before DAD finishes. 996 */ 997 was_tentative = ia->ia6_flags & (IN6_IFF_TENTATIVE|IN6_IFF_DUPLICATED); 998 ia->ia6_flags = ifra->ifra_flags; 999 1000 /* 1001 * Make the address tentative before joining multicast addresses, 1002 * so that corresponding MLD responses would not have a tentative 1003 * source address. 1004 */ 1005 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1006 if (ifp->if_link_state == LINK_STATE_DOWN) { 1007 ia->ia6_flags |= IN6_IFF_DETACHED; 1008 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1009 } else if ((hostIsNew || was_tentative) && if_do_dad(ifp)) 1010 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1011 1012 /* 1013 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1014 * userland, make it deprecated. 1015 */ 1016 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1017 ia->ia6_lifetime.ia6t_pltime = 0; 1018 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1019 } 1020 1021 /* reset the interface and routing table appropriately. */ 1022 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) { 1023 if (hostIsNew) 1024 free(ia, M_IFADDR); 1025 goto exit; 1026 } 1027 1028 /* 1029 * We are done if we have simply modified an existing address. 1030 */ 1031 if (!hostIsNew) 1032 return error; 1033 1034 /* 1035 * Insert ia to the global list and ifa to the interface's list. 1036 */ 1037 IN6_ADDRLIST_WRITER_INSERT_TAIL(ia); 1038 1039 /* gain a refcnt for the link from in6_ifaddr */ 1040 ifaref(&ia->ia_ifa); 1041 ifa_insert(ifp, &ia->ia_ifa); 1042 1043 /* 1044 * Beyond this point, we should call in6_purgeaddr upon an error, 1045 * not just go to unlink. 1046 */ 1047 1048 /* join necessary multicast groups */ 1049 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1050 struct sockaddr_in6 mltaddr, mltmask; 1051 struct in6_addr llsol; 1052 1053 /* join solicited multicast addr for new host id */ 1054 memset(&llsol, 0, sizeof(struct in6_addr)); 1055 llsol.s6_addr16[0] = htons(0xff02); 1056 llsol.s6_addr32[1] = 0; 1057 llsol.s6_addr32[2] = htonl(1); 1058 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 1059 llsol.s6_addr8[12] = 0xff; 1060 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) { 1061 /* XXX: should not happen */ 1062 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 1063 goto cleanup; 1064 } 1065 dad_delay = 0; 1066 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1067 /* 1068 * We need a random delay for DAD on the address 1069 * being configured. It also means delaying 1070 * transmission of the corresponding MLD report to 1071 * avoid report collision. 1072 * [draft-ietf-ipv6-rfc2462bis-02.txt] 1073 */ 1074 dad_delay = cprng_fast32() % 1075 (MAX_RTR_SOLICITATION_DELAY * hz); 1076 } 1077 1078 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */ 1079 /* join solicited multicast addr for new host id */ 1080 imm = in6_joingroup(ifp, &llsol, &error, dad_delay); 1081 if (!imm) { 1082 nd6log(LOG_ERR, 1083 "addmulti failed for %s on %s (errno=%d)\n", 1084 ip6_sprintf(&llsol), if_name(ifp), error); 1085 goto cleanup; 1086 } 1087 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1088 in6m_sol = imm->i6mm_maddr; 1089 1090 sockaddr_in6_init(&mltmask, &in6mask32, 0, 0, 0); 1091 1092 /* 1093 * join link-local all-nodes address 1094 */ 1095 sockaddr_in6_init(&mltaddr, &in6addr_linklocal_allnodes, 1096 0, 0, 0); 1097 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1098 goto cleanup; /* XXX: should not fail */ 1099 1100 /* 1101 * XXX: do we really need this automatic routes? 1102 * We should probably reconsider this stuff. Most applications 1103 * actually do not need the routes, since they usually specify 1104 * the outgoing interface. 1105 */ 1106 rt = rtalloc1(sin6tosa(&mltaddr), 0); 1107 if (rt) { 1108 if (memcmp(&mltaddr.sin6_addr, 1109 &satocsin6(rt_getkey(rt))->sin6_addr, 1110 MLTMASK_LEN)) { 1111 rtfree(rt); 1112 rt = NULL; 1113 } else if (rt->rt_ifp != ifp) { 1114 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 1115 "network %04x:%04x::/32 = %04x:%04x::/32\n", 1116 __func__, rt->rt_ifp, ifp, ifp->if_xname, 1117 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 1118 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 1119 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 1120 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 1121 rt_replace_ifa(rt, &ia->ia_ifa); 1122 rt->rt_ifp = ifp; 1123 } 1124 } 1125 if (!rt) { 1126 struct rt_addrinfo info; 1127 1128 memset(&info, 0, sizeof(info)); 1129 info.rti_info[RTAX_DST] = sin6tosa(&mltaddr); 1130 info.rti_info[RTAX_GATEWAY] = sin6tosa(&ia->ia_addr); 1131 info.rti_info[RTAX_NETMASK] = sin6tosa(&mltmask); 1132 info.rti_info[RTAX_IFA] = sin6tosa(&ia->ia_addr); 1133 /* XXX: we need RTF_CONNECTED to fake nd6_rtrequest */ 1134 info.rti_flags = RTF_UP | RTF_CONNECTED; 1135 error = rtrequest1(RTM_ADD, &info, NULL); 1136 if (error) 1137 goto cleanup; 1138 } else { 1139 rtfree(rt); 1140 } 1141 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1142 if (!imm) { 1143 nd6log(LOG_WARNING, 1144 "addmulti failed for %s on %s (errno=%d)\n", 1145 ip6_sprintf(&mltaddr.sin6_addr), 1146 if_name(ifp), error); 1147 goto cleanup; 1148 } 1149 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1150 1151 /* 1152 * join node information group address 1153 */ 1154 dad_delay = 0; 1155 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1156 /* 1157 * The spec doesn't say anything about delay for this 1158 * group, but the same logic should apply. 1159 */ 1160 dad_delay = cprng_fast32() % 1161 (MAX_RTR_SOLICITATION_DELAY * hz); 1162 } 1163 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr) != 0) 1164 ; 1165 else if ((imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 1166 dad_delay)) == NULL) { /* XXX jinmei */ 1167 nd6log(LOG_WARNING, 1168 "addmulti failed for %s on %s (errno=%d)\n", 1169 ip6_sprintf(&mltaddr.sin6_addr), 1170 if_name(ifp), error); 1171 /* XXX not very fatal, go on... */ 1172 } else { 1173 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1174 } 1175 1176 1177 /* 1178 * join interface-local all-nodes address. 1179 * (ff01::1%ifN, and ff01::%ifN/32) 1180 */ 1181 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1182 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1183 goto cleanup; /* XXX: should not fail */ 1184 1185 /* XXX: again, do we really need the route? */ 1186 rt = rtalloc1(sin6tosa(&mltaddr), 0); 1187 if (rt) { 1188 /* 32bit came from "mltmask" */ 1189 if (memcmp(&mltaddr.sin6_addr, 1190 &satocsin6(rt_getkey(rt))->sin6_addr, 1191 32 / NBBY)) { 1192 rtfree(rt); 1193 rt = NULL; 1194 } else if (rt->rt_ifp != ifp) { 1195 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 1196 "network %04x:%04x::/32 = %04x:%04x::/32\n", 1197 __func__, rt->rt_ifp, ifp, ifp->if_xname, 1198 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 1199 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 1200 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 1201 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 1202 rt_replace_ifa(rt, &ia->ia_ifa); 1203 rt->rt_ifp = ifp; 1204 } 1205 } 1206 if (!rt) { 1207 struct rt_addrinfo info; 1208 1209 memset(&info, 0, sizeof(info)); 1210 info.rti_info[RTAX_DST] = sin6tosa(&mltaddr); 1211 info.rti_info[RTAX_GATEWAY] = sin6tosa(&ia->ia_addr); 1212 info.rti_info[RTAX_NETMASK] = sin6tosa(&mltmask); 1213 info.rti_info[RTAX_IFA] = sin6tosa(&ia->ia_addr); 1214 info.rti_flags = RTF_UP | RTF_CONNECTED; 1215 error = rtrequest1(RTM_ADD, &info, NULL); 1216 if (error) 1217 goto cleanup; 1218 #undef MLTMASK_LEN 1219 } else { 1220 rtfree(rt); 1221 } 1222 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1223 if (!imm) { 1224 nd6log(LOG_WARNING, 1225 "addmulti failed for %s on %s (errno=%d)\n", 1226 ip6_sprintf(&mltaddr.sin6_addr), 1227 if_name(ifp), error); 1228 goto cleanup; 1229 } else { 1230 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1231 } 1232 } 1233 1234 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1235 error = nd6_add_ifa_lle(ia); 1236 if (error != 0) 1237 goto cleanup; 1238 1239 /* 1240 * Perform DAD, if needed. 1241 * XXX It may be of use, if we can administratively 1242 * disable DAD. 1243 */ 1244 if (hostIsNew && if_do_dad(ifp) && 1245 ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && 1246 (ia->ia6_flags & IN6_IFF_TENTATIVE)) 1247 { 1248 int mindelay, maxdelay; 1249 1250 dad_delay = 0; 1251 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1252 /* 1253 * We need to impose a delay before sending an NS 1254 * for DAD. Check if we also needed a delay for the 1255 * corresponding MLD message. If we did, the delay 1256 * should be larger than the MLD delay (this could be 1257 * relaxed a bit, but this simple logic is at least 1258 * safe). 1259 */ 1260 mindelay = 0; 1261 if (in6m_sol != NULL && 1262 in6m_sol->in6m_state == MLD_REPORTPENDING) { 1263 mindelay = in6m_sol->in6m_timer; 1264 } 1265 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1266 if (maxdelay - mindelay == 0) 1267 dad_delay = 0; 1268 else { 1269 dad_delay = 1270 (cprng_fast32() % (maxdelay - mindelay)) + 1271 mindelay; 1272 } 1273 } 1274 /* +1 ensures callout is always used */ 1275 nd6_dad_start(&ia->ia_ifa, dad_delay + 1); 1276 } 1277 1278 return 0; 1279 1280 cleanup: 1281 in6_purgeaddr(&ia->ia_ifa); 1282 exit: 1283 return error; 1284 } 1285 1286 int 1287 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1288 struct in6_ifaddr *ia, int flags) 1289 { 1290 int rc, s; 1291 1292 s = splnet(); 1293 rc = in6_update_ifa1(ifp, ifra, ia, flags); 1294 splx(s); 1295 return rc; 1296 } 1297 1298 void 1299 in6_purgeaddr(struct ifaddr *ifa) 1300 { 1301 struct ifnet *ifp = ifa->ifa_ifp; 1302 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1303 struct in6_multi_mship *imm; 1304 1305 /* stop DAD processing */ 1306 nd6_dad_stop(ifa); 1307 1308 /* 1309 * delete route to the destination of the address being purged. 1310 * The interface must be p2p or loopback in this case. 1311 */ 1312 if ((ia->ia_flags & IFA_ROUTE) != 0 && ia->ia_dstaddr.sin6_len != 0) { 1313 int e; 1314 1315 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 1316 != 0) { 1317 log(LOG_ERR, "in6_purgeaddr: failed to remove " 1318 "a route to the p2p destination: %s on %s, " 1319 "errno=%d\n", 1320 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp), 1321 e); 1322 /* proceed anyway... */ 1323 } else 1324 ia->ia_flags &= ~IFA_ROUTE; 1325 } 1326 1327 /* Remove ownaddr's loopback rtentry, if it exists. */ 1328 in6_ifremlocal(&(ia->ia_ifa)); 1329 1330 /* 1331 * leave from multicast groups we have joined for the interface 1332 */ 1333 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1334 LIST_REMOVE(imm, i6mm_chain); 1335 in6_leavegroup(imm); 1336 } 1337 1338 in6_unlink_ifa(ia, ifp); 1339 } 1340 1341 static void 1342 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1343 { 1344 int s = splnet(); 1345 1346 ifa_remove(ifp, &ia->ia_ifa); 1347 1348 IN6_ADDRLIST_WRITER_REMOVE(ia); 1349 /* TODO psref_target_destroy */ 1350 IN6_ADDRLIST_ENTRY_DESTROY(ia); 1351 1352 /* 1353 * XXX thorpej (at) NetBSD.org -- if the interface is going 1354 * XXX away, don't save the multicast entries, delete them! 1355 */ 1356 if (LIST_EMPTY(&ia->ia6_multiaddrs)) 1357 ; 1358 else if (if_is_deactivated(ia->ia_ifa.ifa_ifp)) { 1359 struct in6_multi *in6m, *next; 1360 1361 for (in6m = LIST_FIRST(&ia->ia6_multiaddrs); in6m != NULL; 1362 in6m = next) { 1363 next = LIST_NEXT(in6m, in6m_entry); 1364 in6_delmulti(in6m); 1365 } 1366 } else 1367 in6_savemkludge(ia); 1368 1369 /* 1370 * Release the reference to the base prefix. There should be a 1371 * positive reference. 1372 */ 1373 if (ia->ia6_ndpr == NULL) { 1374 nd6log(LOG_NOTICE, "autoconf'ed address %p has no prefix\n", 1375 ia); 1376 } else { 1377 ia->ia6_ndpr->ndpr_refcnt--; 1378 ia->ia6_ndpr = NULL; 1379 } 1380 1381 /* 1382 * Also, if the address being removed is autoconf'ed, call 1383 * pfxlist_onlink_check() since the release might affect the status of 1384 * other (detached) addresses. 1385 */ 1386 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) != 0) 1387 pfxlist_onlink_check(); 1388 1389 /* 1390 * release another refcnt for the link from in6_ifaddr. 1391 * Note that we should decrement the refcnt at least once for all *BSD. 1392 */ 1393 ifafree(&ia->ia_ifa); 1394 1395 splx(s); 1396 } 1397 1398 void 1399 in6_purgeif(struct ifnet *ifp) 1400 { 1401 1402 in6_ifdetach(ifp); 1403 } 1404 1405 /* 1406 * SIOC[GAD]LIFADDR. 1407 * SIOCGLIFADDR: get first address. (?) 1408 * SIOCGLIFADDR with IFLR_PREFIX: 1409 * get first address that matches the specified prefix. 1410 * SIOCALIFADDR: add the specified address. 1411 * SIOCALIFADDR with IFLR_PREFIX: 1412 * add the specified prefix, filling hostid part from 1413 * the first link-local address. prefixlen must be <= 64. 1414 * SIOCDLIFADDR: delete the specified address. 1415 * SIOCDLIFADDR with IFLR_PREFIX: 1416 * delete the first address that matches the specified prefix. 1417 * return values: 1418 * EINVAL on invalid parameters 1419 * EADDRNOTAVAIL on prefix match failed/specified address not found 1420 * other values may be returned from in6_ioctl() 1421 * 1422 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1423 * this is to accommodate address naming scheme other than RFC2374, 1424 * in the future. 1425 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1426 * address encoding scheme. (see figure on page 8) 1427 */ 1428 static int 1429 in6_lifaddr_ioctl(struct socket *so, u_long cmd, void *data, 1430 struct ifnet *ifp) 1431 { 1432 struct in6_ifaddr *ia; 1433 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1434 struct ifaddr *ifa; 1435 struct sockaddr *sa; 1436 1437 /* sanity checks */ 1438 if (!data || !ifp) { 1439 panic("invalid argument to in6_lifaddr_ioctl"); 1440 /* NOTREACHED */ 1441 } 1442 1443 switch (cmd) { 1444 case SIOCGLIFADDR: 1445 /* address must be specified on GET with IFLR_PREFIX */ 1446 if ((iflr->flags & IFLR_PREFIX) == 0) 1447 break; 1448 /* FALLTHROUGH */ 1449 case SIOCALIFADDR: 1450 case SIOCDLIFADDR: 1451 /* address must be specified on ADD and DELETE */ 1452 sa = (struct sockaddr *)&iflr->addr; 1453 if (sa->sa_family != AF_INET6) 1454 return EINVAL; 1455 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1456 return EINVAL; 1457 /* XXX need improvement */ 1458 sa = (struct sockaddr *)&iflr->dstaddr; 1459 if (sa->sa_family && sa->sa_family != AF_INET6) 1460 return EINVAL; 1461 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1462 return EINVAL; 1463 break; 1464 default: /* shouldn't happen */ 1465 #if 0 1466 panic("invalid cmd to in6_lifaddr_ioctl"); 1467 /* NOTREACHED */ 1468 #else 1469 return EOPNOTSUPP; 1470 #endif 1471 } 1472 if (sizeof(struct in6_addr) * NBBY < iflr->prefixlen) 1473 return EINVAL; 1474 1475 switch (cmd) { 1476 case SIOCALIFADDR: 1477 { 1478 struct in6_aliasreq ifra; 1479 struct in6_addr *xhostid = NULL; 1480 int prefixlen; 1481 1482 if ((iflr->flags & IFLR_PREFIX) != 0) { 1483 struct sockaddr_in6 *sin6; 1484 1485 /* 1486 * xhostid is to fill in the hostid part of the 1487 * address. xhostid points to the first link-local 1488 * address attached to the interface. 1489 */ 1490 ia = in6ifa_ifpforlinklocal(ifp, 0); 1491 if (ia == NULL) 1492 return EADDRNOTAVAIL; 1493 xhostid = IFA_IN6(&ia->ia_ifa); 1494 1495 /* prefixlen must be <= 64. */ 1496 if (64 < iflr->prefixlen) 1497 return EINVAL; 1498 prefixlen = iflr->prefixlen; 1499 1500 /* hostid part must be zero. */ 1501 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1502 if (sin6->sin6_addr.s6_addr32[2] != 0 1503 || sin6->sin6_addr.s6_addr32[3] != 0) { 1504 return EINVAL; 1505 } 1506 } else 1507 prefixlen = iflr->prefixlen; 1508 1509 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1510 memset(&ifra, 0, sizeof(ifra)); 1511 memcpy(ifra.ifra_name, iflr->iflr_name, sizeof(ifra.ifra_name)); 1512 1513 memcpy(&ifra.ifra_addr, &iflr->addr, 1514 ((struct sockaddr *)&iflr->addr)->sa_len); 1515 if (xhostid) { 1516 /* fill in hostid part */ 1517 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1518 xhostid->s6_addr32[2]; 1519 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1520 xhostid->s6_addr32[3]; 1521 } 1522 1523 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1524 memcpy(&ifra.ifra_dstaddr, &iflr->dstaddr, 1525 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1526 if (xhostid) { 1527 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1528 xhostid->s6_addr32[2]; 1529 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1530 xhostid->s6_addr32[3]; 1531 } 1532 } 1533 1534 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1535 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1536 1537 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 1538 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 1539 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1540 return in6_control(so, SIOCAIFADDR_IN6, &ifra, ifp); 1541 } 1542 case SIOCGLIFADDR: 1543 case SIOCDLIFADDR: 1544 { 1545 struct in6_addr mask, candidate, match; 1546 struct sockaddr_in6 *sin6; 1547 int cmp; 1548 1549 memset(&mask, 0, sizeof(mask)); 1550 if (iflr->flags & IFLR_PREFIX) { 1551 /* lookup a prefix rather than address. */ 1552 in6_prefixlen2mask(&mask, iflr->prefixlen); 1553 1554 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1555 memcpy(&match, &sin6->sin6_addr, sizeof(match)); 1556 match.s6_addr32[0] &= mask.s6_addr32[0]; 1557 match.s6_addr32[1] &= mask.s6_addr32[1]; 1558 match.s6_addr32[2] &= mask.s6_addr32[2]; 1559 match.s6_addr32[3] &= mask.s6_addr32[3]; 1560 1561 /* if you set extra bits, that's wrong */ 1562 if (memcmp(&match, &sin6->sin6_addr, sizeof(match))) 1563 return EINVAL; 1564 1565 cmp = 1; 1566 } else { 1567 if (cmd == SIOCGLIFADDR) { 1568 /* on getting an address, take the 1st match */ 1569 cmp = 0; /* XXX */ 1570 } else { 1571 /* on deleting an address, do exact match */ 1572 in6_prefixlen2mask(&mask, 128); 1573 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1574 memcpy(&match, &sin6->sin6_addr, sizeof(match)); 1575 1576 cmp = 1; 1577 } 1578 } 1579 1580 IFADDR_READER_FOREACH(ifa, ifp) { 1581 if (ifa->ifa_addr->sa_family != AF_INET6) 1582 continue; 1583 if (!cmp) 1584 break; 1585 1586 /* 1587 * XXX: this is adhoc, but is necessary to allow 1588 * a user to specify fe80::/64 (not /10) for a 1589 * link-local address. 1590 */ 1591 memcpy(&candidate, IFA_IN6(ifa), sizeof(candidate)); 1592 in6_clearscope(&candidate); 1593 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1594 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1595 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1596 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1597 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1598 break; 1599 } 1600 if (!ifa) 1601 return EADDRNOTAVAIL; 1602 ia = ifa2ia6(ifa); 1603 1604 if (cmd == SIOCGLIFADDR) { 1605 int error; 1606 1607 /* fill in the if_laddrreq structure */ 1608 memcpy(&iflr->addr, &ia->ia_addr, ia->ia_addr.sin6_len); 1609 error = sa6_recoverscope( 1610 (struct sockaddr_in6 *)&iflr->addr); 1611 if (error != 0) 1612 return error; 1613 1614 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1615 memcpy(&iflr->dstaddr, &ia->ia_dstaddr, 1616 ia->ia_dstaddr.sin6_len); 1617 error = sa6_recoverscope( 1618 (struct sockaddr_in6 *)&iflr->dstaddr); 1619 if (error != 0) 1620 return error; 1621 } else 1622 memset(&iflr->dstaddr, 0, sizeof(iflr->dstaddr)); 1623 1624 iflr->prefixlen = 1625 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1626 1627 iflr->flags = ia->ia6_flags; /* XXX */ 1628 1629 return 0; 1630 } else { 1631 struct in6_aliasreq ifra; 1632 1633 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1634 memset(&ifra, 0, sizeof(ifra)); 1635 memcpy(ifra.ifra_name, iflr->iflr_name, 1636 sizeof(ifra.ifra_name)); 1637 1638 memcpy(&ifra.ifra_addr, &ia->ia_addr, 1639 ia->ia_addr.sin6_len); 1640 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1641 memcpy(&ifra.ifra_dstaddr, &ia->ia_dstaddr, 1642 ia->ia_dstaddr.sin6_len); 1643 } else { 1644 memset(&ifra.ifra_dstaddr, 0, 1645 sizeof(ifra.ifra_dstaddr)); 1646 } 1647 memcpy(&ifra.ifra_dstaddr, &ia->ia_prefixmask, 1648 ia->ia_prefixmask.sin6_len); 1649 1650 ifra.ifra_flags = ia->ia6_flags; 1651 return in6_control(so, SIOCDIFADDR_IN6, &ifra, ifp); 1652 } 1653 } 1654 } 1655 1656 return EOPNOTSUPP; /* just for safety */ 1657 } 1658 1659 /* 1660 * Initialize an interface's internet6 address 1661 * and routing table entry. 1662 */ 1663 static int 1664 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1665 const struct sockaddr_in6 *sin6, int newhost) 1666 { 1667 int error = 0, plen, ifacount = 0; 1668 int s = splnet(); 1669 struct ifaddr *ifa; 1670 1671 /* 1672 * Give the interface a chance to initialize 1673 * if this is its first address, 1674 * and to validate the address if necessary. 1675 */ 1676 IFADDR_READER_FOREACH(ifa, ifp) { 1677 if (ifa->ifa_addr->sa_family != AF_INET6) 1678 continue; 1679 ifacount++; 1680 } 1681 1682 ia->ia_addr = *sin6; 1683 1684 if (ifacount <= 0 && 1685 (error = if_addr_init(ifp, &ia->ia_ifa, true)) != 0) { 1686 splx(s); 1687 return error; 1688 } 1689 splx(s); 1690 1691 ia->ia_ifa.ifa_metric = ifp->if_metric; 1692 1693 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1694 1695 /* 1696 * Special case: 1697 * If the destination address is specified for a point-to-point 1698 * interface, install a route to the destination as an interface 1699 * direct route. 1700 */ 1701 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1702 if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) { 1703 if ((error = rtinit(&ia->ia_ifa, RTM_ADD, 1704 RTF_UP | RTF_HOST)) != 0) 1705 return error; 1706 ia->ia_flags |= IFA_ROUTE; 1707 } 1708 1709 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1710 if (newhost) { 1711 /* set the rtrequest function to create llinfo */ 1712 if (ifp->if_flags & IFF_POINTOPOINT) 1713 ia->ia_ifa.ifa_rtrequest = p2p_rtrequest; 1714 else if ((ifp->if_flags & IFF_LOOPBACK) == 0) 1715 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1716 in6_ifaddlocal(&ia->ia_ifa); 1717 } else { 1718 /* Inform the routing socket of new flags/timings */ 1719 rt_newaddrmsg(RTM_NEWADDR, &ia->ia_ifa, 0, NULL); 1720 } 1721 1722 if (ifp->if_flags & IFF_MULTICAST) 1723 in6_restoremkludge(ia, ifp); 1724 1725 return error; 1726 } 1727 1728 static struct ifaddr * 1729 bestifa(struct ifaddr *best_ifa, struct ifaddr *ifa) 1730 { 1731 if (best_ifa == NULL || best_ifa->ifa_preference < ifa->ifa_preference) 1732 return ifa; 1733 return best_ifa; 1734 } 1735 1736 /* 1737 * Find an IPv6 interface link-local address specific to an interface. 1738 */ 1739 struct in6_ifaddr * 1740 in6ifa_ifpforlinklocal(const struct ifnet *ifp, const int ignoreflags) 1741 { 1742 struct ifaddr *best_ifa = NULL, *ifa; 1743 1744 IFADDR_READER_FOREACH(ifa, ifp) { 1745 if (ifa->ifa_addr->sa_family != AF_INET6) 1746 continue; 1747 if (!IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) 1748 continue; 1749 if ((((struct in6_ifaddr *)ifa)->ia6_flags & ignoreflags) != 0) 1750 continue; 1751 best_ifa = bestifa(best_ifa, ifa); 1752 } 1753 1754 return (struct in6_ifaddr *)best_ifa; 1755 } 1756 1757 /* 1758 * find the internet address corresponding to a given address. 1759 * ifaddr is returned referenced. 1760 */ 1761 struct in6_ifaddr * 1762 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid) 1763 { 1764 struct in6_ifaddr *ia; 1765 1766 #ifdef __FreeBSD__ 1767 IN6_IFADDR_RLOCK(); 1768 LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) { 1769 #else 1770 IN6_ADDRLIST_READER_FOREACH(ia) { 1771 #endif 1772 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1773 if (zoneid != 0 && 1774 zoneid != ia->ia_addr.sin6_scope_id) 1775 continue; 1776 ifaref(&ia->ia_ifa); 1777 break; 1778 } 1779 } 1780 #ifdef __FreeBSD__ 1781 IN6_IFADDR_RUNLOCK(); 1782 #endif 1783 return ia; 1784 } 1785 1786 /* 1787 * find the internet address corresponding to a given interface and address. 1788 */ 1789 struct in6_ifaddr * 1790 in6ifa_ifpwithaddr(const struct ifnet *ifp, const struct in6_addr *addr) 1791 { 1792 struct ifaddr *best_ifa = NULL, *ifa; 1793 1794 IFADDR_READER_FOREACH(ifa, ifp) { 1795 if (ifa->ifa_addr->sa_family != AF_INET6) 1796 continue; 1797 if (!IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1798 continue; 1799 best_ifa = bestifa(best_ifa, ifa); 1800 } 1801 1802 return (struct in6_ifaddr *)best_ifa; 1803 } 1804 1805 static struct in6_ifaddr * 1806 bestia(struct in6_ifaddr *best_ia, struct in6_ifaddr *ia) 1807 { 1808 if (best_ia == NULL || 1809 best_ia->ia_ifa.ifa_preference < ia->ia_ifa.ifa_preference) 1810 return ia; 1811 return best_ia; 1812 } 1813 1814 /* 1815 * Convert IP6 address to printable (loggable) representation. 1816 */ 1817 char * 1818 ip6_sprintf(const struct in6_addr *addr) 1819 { 1820 static int ip6round = 0; 1821 static char ip6buf[8][INET6_ADDRSTRLEN]; 1822 char *cp = ip6buf[ip6round++ & 7]; 1823 1824 in6_print(cp, INET6_ADDRSTRLEN, addr); 1825 return cp; 1826 } 1827 1828 /* 1829 * Determine if an address is on a local network. 1830 */ 1831 int 1832 in6_localaddr(const struct in6_addr *in6) 1833 { 1834 struct in6_ifaddr *ia; 1835 int s; 1836 1837 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1838 return 1; 1839 1840 s = pserialize_read_enter(); 1841 IN6_ADDRLIST_READER_FOREACH(ia) { 1842 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1843 &ia->ia_prefixmask.sin6_addr)) { 1844 pserialize_read_exit(s); 1845 return 1; 1846 } 1847 } 1848 pserialize_read_exit(s); 1849 1850 return 0; 1851 } 1852 1853 int 1854 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1855 { 1856 struct in6_ifaddr *ia; 1857 int s; 1858 1859 s = pserialize_read_enter(); 1860 IN6_ADDRLIST_READER_FOREACH(ia) { 1861 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1862 &sa6->sin6_addr) && 1863 #ifdef SCOPEDROUTING 1864 ia->ia_addr.sin6_scope_id == sa6->sin6_scope_id && 1865 #endif 1866 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) { 1867 pserialize_read_exit(s); 1868 return 1; /* true */ 1869 } 1870 1871 /* XXX: do we still have to go thru the rest of the list? */ 1872 } 1873 pserialize_read_exit(s); 1874 1875 return 0; /* false */ 1876 } 1877 1878 /* 1879 * return length of part which dst and src are equal 1880 * hard coding... 1881 */ 1882 int 1883 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1884 { 1885 int match = 0; 1886 u_char *s = (u_char *)src, *d = (u_char *)dst; 1887 u_char *lim = s + 16, r; 1888 1889 while (s < lim) 1890 if ((r = (*d++ ^ *s++)) != 0) { 1891 while (r < 128) { 1892 match++; 1893 r <<= 1; 1894 } 1895 break; 1896 } else 1897 match += NBBY; 1898 return match; 1899 } 1900 1901 /* XXX: to be scope conscious */ 1902 int 1903 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1904 { 1905 int bytelen, bitlen; 1906 1907 /* sanity check */ 1908 if (len < 0 || len > 128) { 1909 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1910 len); 1911 return 0; 1912 } 1913 1914 bytelen = len / NBBY; 1915 bitlen = len % NBBY; 1916 1917 if (memcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1918 return 0; 1919 if (bitlen != 0 && 1920 p1->s6_addr[bytelen] >> (NBBY - bitlen) != 1921 p2->s6_addr[bytelen] >> (NBBY - bitlen)) 1922 return 0; 1923 1924 return 1; 1925 } 1926 1927 void 1928 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1929 { 1930 static const u_char maskarray[NBBY] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1931 int bytelen, bitlen, i; 1932 1933 /* sanity check */ 1934 if (len < 0 || len > 128) { 1935 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1936 len); 1937 return; 1938 } 1939 1940 memset(maskp, 0, sizeof(*maskp)); 1941 bytelen = len / NBBY; 1942 bitlen = len % NBBY; 1943 for (i = 0; i < bytelen; i++) 1944 maskp->s6_addr[i] = 0xff; 1945 if (bitlen) 1946 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1947 } 1948 1949 /* 1950 * return the best address out of the same scope. if no address was 1951 * found, return the first valid address from designated IF. 1952 */ 1953 struct in6_ifaddr * 1954 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 1955 { 1956 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 1957 struct ifaddr *ifa; 1958 struct in6_ifaddr *best_ia = NULL, *ia; 1959 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 1960 1961 dep[0] = dep[1] = NULL; 1962 1963 /* 1964 * We first look for addresses in the same scope. 1965 * If there is one, return it. 1966 * If two or more, return one which matches the dst longest. 1967 * If none, return one of global addresses assigned other ifs. 1968 */ 1969 IFADDR_READER_FOREACH(ifa, ifp) { 1970 if (ifa->ifa_addr->sa_family != AF_INET6) 1971 continue; 1972 ia = (struct in6_ifaddr *)ifa; 1973 if (ia->ia6_flags & IN6_IFF_ANYCAST) 1974 continue; /* XXX: is there any case to allow anycast? */ 1975 if (ia->ia6_flags & IN6_IFF_NOTREADY) 1976 continue; /* don't use this interface */ 1977 if (ia->ia6_flags & IN6_IFF_DETACHED) 1978 continue; 1979 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 1980 if (ip6_use_deprecated) 1981 dep[0] = ia; 1982 continue; 1983 } 1984 1985 if (dst_scope != in6_addrscope(IFA_IN6(ifa))) 1986 continue; 1987 /* 1988 * call in6_matchlen() as few as possible 1989 */ 1990 if (best_ia == NULL) { 1991 best_ia = ia; 1992 continue; 1993 } 1994 if (blen == -1) 1995 blen = in6_matchlen(&best_ia->ia_addr.sin6_addr, dst); 1996 tlen = in6_matchlen(IFA_IN6(ifa), dst); 1997 if (tlen > blen) { 1998 blen = tlen; 1999 best_ia = ia; 2000 } else if (tlen == blen) 2001 best_ia = bestia(best_ia, ia); 2002 } 2003 if (best_ia != NULL) 2004 return best_ia; 2005 2006 IFADDR_READER_FOREACH(ifa, ifp) { 2007 if (ifa->ifa_addr->sa_family != AF_INET6) 2008 continue; 2009 ia = (struct in6_ifaddr *)ifa; 2010 if (ia->ia6_flags & IN6_IFF_ANYCAST) 2011 continue; /* XXX: is there any case to allow anycast? */ 2012 if (ia->ia6_flags & IN6_IFF_NOTREADY) 2013 continue; /* don't use this interface */ 2014 if (ia->ia6_flags & IN6_IFF_DETACHED) 2015 continue; 2016 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2017 if (ip6_use_deprecated) 2018 dep[1] = (struct in6_ifaddr *)ifa; 2019 continue; 2020 } 2021 2022 best_ia = bestia(best_ia, ia); 2023 } 2024 if (best_ia != NULL) 2025 return best_ia; 2026 2027 /* use the last-resort values, that are, deprecated addresses */ 2028 if (dep[0]) 2029 return dep[0]; 2030 if (dep[1]) 2031 return dep[1]; 2032 2033 return NULL; 2034 } 2035 2036 /* 2037 * perform DAD when interface becomes IFF_UP. 2038 */ 2039 void 2040 in6_if_link_up(struct ifnet *ifp) 2041 { 2042 struct ifaddr *ifa; 2043 struct in6_ifaddr *ia; 2044 2045 /* Ensure it's sane to run DAD */ 2046 if (ifp->if_link_state == LINK_STATE_DOWN) 2047 return; 2048 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) 2049 return; 2050 2051 IFADDR_READER_FOREACH(ifa, ifp) { 2052 if (ifa->ifa_addr->sa_family != AF_INET6) 2053 continue; 2054 ia = (struct in6_ifaddr *)ifa; 2055 2056 /* If detached then mark as tentative */ 2057 if (ia->ia6_flags & IN6_IFF_DETACHED) { 2058 ia->ia6_flags &= ~IN6_IFF_DETACHED; 2059 if (if_do_dad(ifp)) { 2060 ia->ia6_flags |= IN6_IFF_TENTATIVE; 2061 nd6log(LOG_ERR, "%s marked tentative\n", 2062 ip6_sprintf(&ia->ia_addr.sin6_addr)); 2063 } else if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) 2064 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 2065 } 2066 2067 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2068 int rand_delay; 2069 2070 /* Clear the duplicated flag as we're starting DAD. */ 2071 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; 2072 2073 /* 2074 * The TENTATIVE flag was likely set by hand 2075 * beforehand, implicitly indicating the need for DAD. 2076 * We may be able to skip the random delay in this 2077 * case, but we impose delays just in case. 2078 */ 2079 rand_delay = cprng_fast32() % 2080 (MAX_RTR_SOLICITATION_DELAY * hz); 2081 /* +1 ensures callout is always used */ 2082 nd6_dad_start(ifa, rand_delay + 1); 2083 } 2084 } 2085 2086 /* Restore any detached prefixes */ 2087 pfxlist_onlink_check(); 2088 } 2089 2090 void 2091 in6_if_up(struct ifnet *ifp) 2092 { 2093 2094 /* 2095 * special cases, like 6to4, are handled in in6_ifattach 2096 */ 2097 in6_ifattach(ifp, NULL); 2098 2099 /* interface may not support link state, so bring it up also */ 2100 in6_if_link_up(ifp); 2101 } 2102 2103 /* 2104 * Mark all addresses as detached. 2105 */ 2106 void 2107 in6_if_link_down(struct ifnet *ifp) 2108 { 2109 struct ifaddr *ifa; 2110 struct in6_ifaddr *ia; 2111 2112 /* Any prefixes on this interface should be detached as well */ 2113 pfxlist_onlink_check(); 2114 2115 IFADDR_READER_FOREACH(ifa, ifp) { 2116 if (ifa->ifa_addr->sa_family != AF_INET6) 2117 continue; 2118 ia = (struct in6_ifaddr *)ifa; 2119 2120 /* Stop DAD processing */ 2121 nd6_dad_stop(ifa); 2122 2123 /* 2124 * Mark the address as detached. 2125 * This satisfies RFC4862 Section 5.3, but we should apply 2126 * this logic to all addresses to be a good citizen and 2127 * avoid potential duplicated addresses. 2128 * When the interface comes up again, detached addresses 2129 * are marked tentative and DAD commences. 2130 */ 2131 if (!(ia->ia6_flags & IN6_IFF_DETACHED)) { 2132 nd6log(LOG_DEBUG, "%s marked detached\n", 2133 ip6_sprintf(&ia->ia_addr.sin6_addr)); 2134 ia->ia6_flags |= IN6_IFF_DETACHED; 2135 ia->ia6_flags &= 2136 ~(IN6_IFF_TENTATIVE | IN6_IFF_DUPLICATED); 2137 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 2138 } 2139 } 2140 } 2141 2142 void 2143 in6_if_down(struct ifnet *ifp) 2144 { 2145 2146 in6_if_link_down(ifp); 2147 } 2148 2149 void 2150 in6_if_link_state_change(struct ifnet *ifp, int link_state) 2151 { 2152 2153 switch (link_state) { 2154 case LINK_STATE_DOWN: 2155 in6_if_link_down(ifp); 2156 break; 2157 case LINK_STATE_UP: 2158 in6_if_link_up(ifp); 2159 break; 2160 } 2161 } 2162 2163 /* 2164 * Calculate max IPv6 MTU through all the interfaces and store it 2165 * to in6_maxmtu. 2166 */ 2167 void 2168 in6_setmaxmtu(void) 2169 { 2170 unsigned long maxmtu = 0; 2171 struct ifnet *ifp; 2172 int s; 2173 2174 s = pserialize_read_enter(); 2175 IFNET_READER_FOREACH(ifp) { 2176 /* this function can be called during ifnet initialization */ 2177 if (!ifp->if_afdata[AF_INET6]) 2178 continue; 2179 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2180 IN6_LINKMTU(ifp) > maxmtu) 2181 maxmtu = IN6_LINKMTU(ifp); 2182 } 2183 pserialize_read_exit(s); 2184 if (maxmtu) /* update only when maxmtu is positive */ 2185 in6_maxmtu = maxmtu; 2186 } 2187 2188 /* 2189 * Provide the length of interface identifiers to be used for the link attached 2190 * to the given interface. The length should be defined in "IPv6 over 2191 * xxx-link" document. Note that address architecture might also define 2192 * the length for a particular set of address prefixes, regardless of the 2193 * link type. As clarified in rfc2462bis, those two definitions should be 2194 * consistent, and those really are as of August 2004. 2195 */ 2196 int 2197 in6_if2idlen(struct ifnet *ifp) 2198 { 2199 switch (ifp->if_type) { 2200 case IFT_ETHER: /* RFC2464 */ 2201 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2202 case IFT_L2VLAN: /* ditto */ 2203 case IFT_IEEE80211: /* ditto */ 2204 case IFT_FDDI: /* RFC2467 */ 2205 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 2206 case IFT_PPP: /* RFC2472 */ 2207 case IFT_ARCNET: /* RFC2497 */ 2208 case IFT_FRELAY: /* RFC2590 */ 2209 case IFT_IEEE1394: /* RFC3146 */ 2210 case IFT_GIF: /* draft-ietf-v6ops-mech-v2-07 */ 2211 case IFT_LOOP: /* XXX: is this really correct? */ 2212 return 64; 2213 default: 2214 /* 2215 * Unknown link type: 2216 * It might be controversial to use the today's common constant 2217 * of 64 for these cases unconditionally. For full compliance, 2218 * we should return an error in this case. On the other hand, 2219 * if we simply miss the standard for the link type or a new 2220 * standard is defined for a new link type, the IFID length 2221 * is very likely to be the common constant. As a compromise, 2222 * we always use the constant, but make an explicit notice 2223 * indicating the "unknown" case. 2224 */ 2225 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2226 return 64; 2227 } 2228 } 2229 2230 struct in6_llentry { 2231 struct llentry base; 2232 }; 2233 2234 #define IN6_LLTBL_DEFAULT_HSIZE 32 2235 #define IN6_LLTBL_HASH(k, h) \ 2236 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 2237 2238 /* 2239 * Do actual deallocation of @lle. 2240 * Called by LLE_FREE_LOCKED when number of references 2241 * drops to zero. 2242 */ 2243 static void 2244 in6_lltable_destroy_lle(struct llentry *lle) 2245 { 2246 2247 LLE_WUNLOCK(lle); 2248 LLE_LOCK_DESTROY(lle); 2249 kmem_intr_free(lle, sizeof(struct in6_llentry)); 2250 } 2251 2252 static struct llentry * 2253 in6_lltable_new(const struct in6_addr *addr6, u_int flags) 2254 { 2255 struct in6_llentry *lle; 2256 2257 lle = kmem_intr_zalloc(sizeof(struct in6_llentry), KM_NOSLEEP); 2258 if (lle == NULL) /* NB: caller generates msg */ 2259 return NULL; 2260 2261 lle->base.r_l3addr.addr6 = *addr6; 2262 lle->base.lle_refcnt = 1; 2263 lle->base.lle_free = in6_lltable_destroy_lle; 2264 LLE_LOCK_INIT(&lle->base); 2265 callout_init(&lle->base.lle_timer, CALLOUT_MPSAFE); 2266 2267 return &lle->base; 2268 } 2269 2270 static int 2271 in6_lltable_match_prefix(const struct sockaddr *prefix, 2272 const struct sockaddr *mask, u_int flags, struct llentry *lle) 2273 { 2274 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix; 2275 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask; 2276 2277 if (IN6_ARE_MASKED_ADDR_EQUAL(&lle->r_l3addr.addr6, 2278 &pfx->sin6_addr, &msk->sin6_addr) && 2279 ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) 2280 return 1; 2281 2282 return 0; 2283 } 2284 2285 static void 2286 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle) 2287 { 2288 struct ifnet *ifp __diagused; 2289 2290 LLE_WLOCK_ASSERT(lle); 2291 KASSERT(llt != NULL); 2292 2293 /* Unlink entry from table */ 2294 if ((lle->la_flags & LLE_LINKED) != 0) { 2295 2296 ifp = llt->llt_ifp; 2297 IF_AFDATA_WLOCK_ASSERT(ifp); 2298 lltable_unlink_entry(llt, lle); 2299 } 2300 2301 KASSERT(mutex_owned(softnet_lock)); 2302 callout_halt(&lle->lle_timer, softnet_lock); 2303 LLE_REMREF(lle); 2304 2305 llentry_free(lle); 2306 } 2307 2308 static int 2309 in6_lltable_rtcheck(struct ifnet *ifp, 2310 u_int flags, 2311 const struct sockaddr *l3addr) 2312 { 2313 struct rtentry *rt; 2314 2315 KASSERTMSG(l3addr->sa_family == AF_INET6, 2316 "sin_family %d", l3addr->sa_family); 2317 2318 rt = rtalloc1(l3addr, 0); 2319 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 2320 struct ifaddr *ifa; 2321 /* 2322 * Create an ND6 cache for an IPv6 neighbor 2323 * that is not covered by our own prefix. 2324 */ 2325 /* XXX ifaof_ifpforaddr should take a const param */ 2326 ifa = ifaof_ifpforaddr(l3addr, ifp); 2327 if (ifa != NULL) { 2328 ifafree(ifa); 2329 if (rt != NULL) 2330 rtfree(rt); 2331 return 0; 2332 } 2333 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2334 ip6_sprintf(&((const struct sockaddr_in6 *)l3addr)->sin6_addr)); 2335 if (rt != NULL) 2336 rtfree(rt); 2337 return EINVAL; 2338 } 2339 rtfree(rt); 2340 return 0; 2341 } 2342 2343 static inline uint32_t 2344 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize) 2345 { 2346 2347 return IN6_LLTBL_HASH(dst->s6_addr32[3], hsize); 2348 } 2349 2350 static uint32_t 2351 in6_lltable_hash(const struct llentry *lle, uint32_t hsize) 2352 { 2353 2354 return in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize); 2355 } 2356 2357 static void 2358 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 2359 { 2360 struct sockaddr_in6 *sin6; 2361 2362 sin6 = (struct sockaddr_in6 *)sa; 2363 bzero(sin6, sizeof(*sin6)); 2364 sin6->sin6_family = AF_INET6; 2365 sin6->sin6_len = sizeof(*sin6); 2366 sin6->sin6_addr = lle->r_l3addr.addr6; 2367 } 2368 2369 static inline struct llentry * 2370 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst) 2371 { 2372 struct llentry *lle; 2373 struct llentries *lleh; 2374 u_int hashidx; 2375 2376 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize); 2377 lleh = &llt->lle_head[hashidx]; 2378 LIST_FOREACH(lle, lleh, lle_next) { 2379 if (lle->la_flags & LLE_DELETED) 2380 continue; 2381 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst)) 2382 break; 2383 } 2384 2385 return lle; 2386 } 2387 2388 static int 2389 in6_lltable_delete(struct lltable *llt, u_int flags, 2390 const struct sockaddr *l3addr) 2391 { 2392 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2393 struct llentry *lle; 2394 2395 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp); 2396 KASSERTMSG(l3addr->sa_family == AF_INET6, 2397 "sin_family %d", l3addr->sa_family); 2398 2399 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2400 2401 if (lle == NULL) 2402 return ENOENT; 2403 2404 LLE_WLOCK(lle); 2405 lle->la_flags |= LLE_DELETED; 2406 #ifdef DIAGNOSTIC 2407 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2408 #endif 2409 if ((lle->la_flags & (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC) 2410 llentry_free(lle); 2411 else 2412 LLE_WUNLOCK(lle); 2413 2414 return 0; 2415 } 2416 2417 static struct llentry * 2418 in6_lltable_create(struct lltable *llt, u_int flags, 2419 const struct sockaddr *l3addr) 2420 { 2421 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2422 struct ifnet *ifp = llt->llt_ifp; 2423 struct llentry *lle; 2424 2425 IF_AFDATA_WLOCK_ASSERT(ifp); 2426 KASSERTMSG(l3addr->sa_family == AF_INET6, 2427 "sin_family %d", l3addr->sa_family); 2428 2429 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2430 2431 if (lle != NULL) { 2432 LLE_WLOCK(lle); 2433 return lle; 2434 } 2435 2436 /* 2437 * A route that covers the given address must have 2438 * been installed 1st because we are doing a resolution, 2439 * verify this. 2440 */ 2441 if (!(flags & LLE_IFADDR) && 2442 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2443 return NULL; 2444 2445 lle = in6_lltable_new(&sin6->sin6_addr, flags); 2446 if (lle == NULL) { 2447 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2448 return NULL; 2449 } 2450 lle->la_flags = flags; 2451 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 2452 memcpy(&lle->ll_addr, CLLADDR(ifp->if_sadl), ifp->if_addrlen); 2453 lle->la_flags |= LLE_VALID; 2454 } 2455 2456 lltable_link_entry(llt, lle); 2457 LLE_WLOCK(lle); 2458 2459 return lle; 2460 } 2461 2462 static struct llentry * 2463 in6_lltable_lookup(struct lltable *llt, u_int flags, 2464 const struct sockaddr *l3addr) 2465 { 2466 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2467 struct llentry *lle; 2468 2469 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 2470 KASSERTMSG(l3addr->sa_family == AF_INET6, 2471 "sin_family %d", l3addr->sa_family); 2472 2473 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2474 2475 if (lle == NULL) 2476 return NULL; 2477 2478 if (flags & LLE_EXCLUSIVE) 2479 LLE_WLOCK(lle); 2480 else 2481 LLE_RLOCK(lle); 2482 return lle; 2483 } 2484 2485 static int 2486 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 2487 struct rt_walkarg *w) 2488 { 2489 struct sockaddr_in6 sin6; 2490 2491 LLTABLE_LOCK_ASSERT(); 2492 2493 /* skip deleted entries */ 2494 if (lle->la_flags & LLE_DELETED) 2495 return 0; 2496 2497 sockaddr_in6_init(&sin6, &lle->r_l3addr.addr6, 0, 0, 0); 2498 2499 return lltable_dump_entry(llt, lle, w, sin6tosa(&sin6)); 2500 } 2501 2502 static struct lltable * 2503 in6_lltattach(struct ifnet *ifp) 2504 { 2505 struct lltable *llt; 2506 2507 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE); 2508 llt->llt_af = AF_INET6; 2509 llt->llt_ifp = ifp; 2510 2511 llt->llt_lookup = in6_lltable_lookup; 2512 llt->llt_create = in6_lltable_create; 2513 llt->llt_delete = in6_lltable_delete; 2514 llt->llt_dump_entry = in6_lltable_dump_entry; 2515 llt->llt_hash = in6_lltable_hash; 2516 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry; 2517 llt->llt_free_entry = in6_lltable_free_entry; 2518 llt->llt_match_prefix = in6_lltable_match_prefix; 2519 lltable_link(llt); 2520 2521 return llt; 2522 } 2523 2524 void * 2525 in6_domifattach(struct ifnet *ifp) 2526 { 2527 struct in6_ifextra *ext; 2528 2529 ext = malloc(sizeof(*ext), M_IFADDR, M_WAITOK|M_ZERO); 2530 2531 ext->in6_ifstat = malloc(sizeof(struct in6_ifstat), 2532 M_IFADDR, M_WAITOK|M_ZERO); 2533 2534 ext->icmp6_ifstat = malloc(sizeof(struct icmp6_ifstat), 2535 M_IFADDR, M_WAITOK|M_ZERO); 2536 2537 ext->nd_ifinfo = nd6_ifattach(ifp); 2538 ext->scope6_id = scope6_ifattach(ifp); 2539 ext->nprefixes = 0; 2540 ext->ndefrouters = 0; 2541 2542 ext->lltable = in6_lltattach(ifp); 2543 2544 return ext; 2545 } 2546 2547 void 2548 in6_domifdetach(struct ifnet *ifp, void *aux) 2549 { 2550 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2551 2552 lltable_free(ext->lltable); 2553 ext->lltable = NULL; 2554 nd6_ifdetach(ifp, ext); 2555 free(ext->in6_ifstat, M_IFADDR); 2556 free(ext->icmp6_ifstat, M_IFADDR); 2557 scope6_ifdetach(ext->scope6_id); 2558 free(ext, M_IFADDR); 2559 } 2560 2561 /* 2562 * Convert IPv4 address stored in struct in_addr to IPv4-Mapped IPv6 address 2563 * stored in struct in6_addr as defined in RFC 4921 section 2.5.5.2. 2564 */ 2565 void 2566 in6_in_2_v4mapin6(const struct in_addr *in, struct in6_addr *in6) 2567 { 2568 in6->s6_addr32[0] = 0; 2569 in6->s6_addr32[1] = 0; 2570 in6->s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2571 in6->s6_addr32[3] = in->s_addr; 2572 } 2573 2574 /* 2575 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2576 * v4 mapped addr or v4 compat addr 2577 */ 2578 void 2579 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2580 { 2581 memset(sin, 0, sizeof(*sin)); 2582 sin->sin_len = sizeof(struct sockaddr_in); 2583 sin->sin_family = AF_INET; 2584 sin->sin_port = sin6->sin6_port; 2585 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2586 } 2587 2588 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2589 void 2590 in6_sin_2_v4mapsin6(const struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2591 { 2592 memset(sin6, 0, sizeof(*sin6)); 2593 sin6->sin6_len = sizeof(struct sockaddr_in6); 2594 sin6->sin6_family = AF_INET6; 2595 sin6->sin6_port = sin->sin_port; 2596 in6_in_2_v4mapin6(&sin->sin_addr, &sin6->sin6_addr); 2597 } 2598 2599 /* Convert sockaddr_in6 into sockaddr_in. */ 2600 void 2601 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2602 { 2603 struct sockaddr_in *sin_p; 2604 struct sockaddr_in6 sin6; 2605 2606 /* 2607 * Save original sockaddr_in6 addr and convert it 2608 * to sockaddr_in. 2609 */ 2610 sin6 = *(struct sockaddr_in6 *)nam; 2611 sin_p = (struct sockaddr_in *)nam; 2612 in6_sin6_2_sin(sin_p, &sin6); 2613 } 2614 2615 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2616 void 2617 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2618 { 2619 struct sockaddr_in *sin_p; 2620 struct sockaddr_in6 *sin6_p; 2621 2622 sin6_p = malloc(sizeof(*sin6_p), M_SONAME, M_WAITOK); 2623 sin_p = (struct sockaddr_in *)*nam; 2624 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2625 free(*nam, M_SONAME); 2626 *nam = sin6tosa(sin6_p); 2627 } 2628
Indexes created Sun Sep 21 20:09:37 GMT 2025