1 /* $FreeBSD: src/sys/netinet6/in6.c,v 1.7.2.9 2002/04/28 05:40:26 suz Exp $ */ 2 /* $DragonFly: src/sys/netinet6/in6.c,v 1.30 2008/10/03 07:59:20 hasso Exp $ */ 3 /* $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $ */ 4 5 /* 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * Copyright (c) 1982, 1986, 1991, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by the University of 49 * California, Berkeley and its contributors. 50 * 4. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)in.c 8.2 (Berkeley) 11/15/93 67 */ 68 69 #include "opt_inet.h" 70 #include "opt_inet6.h" 71 72 #include <sys/param.h> 73 #include <sys/errno.h> 74 #include <sys/malloc.h> 75 #include <sys/socket.h> 76 #include <sys/socketvar.h> 77 #include <sys/sockio.h> 78 #include <sys/systm.h> 79 #include <sys/proc.h> 80 #include <sys/priv.h> 81 #include <sys/time.h> 82 #include <sys/kernel.h> 83 #include <sys/syslog.h> 84 85 #include <sys/thread2.h> 86 #include <sys/msgport2.h> 87 88 #include <net/if.h> 89 #include <net/if_types.h> 90 #include <net/route.h> 91 #include <net/if_dl.h> 92 93 #include <netinet/in.h> 94 #include <netinet/in_var.h> 95 #include <netinet/if_ether.h> 96 #include <netinet/in_systm.h> 97 #include <netinet/ip.h> 98 #include <netinet/in_pcb.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 #include <netinet6/in6_pcb.h> 108 #include <netinet6/in6_var.h> 109 110 #include <net/net_osdep.h> 111 112 /* 113 * Definitions of some costant IP6 addresses. 114 */ 115 const struct in6_addr kin6addr_any = IN6ADDR_ANY_INIT; 116 const struct in6_addr kin6addr_loopback = IN6ADDR_LOOPBACK_INIT; 117 const struct in6_addr kin6addr_nodelocal_allnodes = 118 IN6ADDR_NODELOCAL_ALLNODES_INIT; 119 const struct in6_addr kin6addr_linklocal_allnodes = 120 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 121 const struct in6_addr kin6addr_linklocal_allrouters = 122 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 123 124 const struct in6_addr in6mask0 = IN6MASK0; 125 const struct in6_addr in6mask32 = IN6MASK32; 126 const struct in6_addr in6mask64 = IN6MASK64; 127 const struct in6_addr in6mask96 = IN6MASK96; 128 const struct in6_addr in6mask128 = IN6MASK128; 129 130 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6, 131 0, 0, IN6ADDR_ANY_INIT, 0}; 132 133 static int in6_lifaddr_ioctl (struct socket *, u_long, caddr_t, 134 struct ifnet *, struct thread *); 135 static int in6_ifinit (struct ifnet *, struct in6_ifaddr *, 136 struct sockaddr_in6 *, int); 137 static void in6_unlink_ifa (struct in6_ifaddr *, struct ifnet *); 138 static void in6_ifloop_request_callback(int, int, struct rt_addrinfo *, struct rtentry *, void *); 139 140 struct in6_multihead in6_multihead; /* XXX BSS initialization */ 141 142 int (*faithprefix_p)(struct in6_addr *); 143 144 /* 145 * Subroutine for in6_ifaddloop() and in6_ifremloop(). 146 * This routine does actual work. 147 */ 148 static void 149 in6_ifloop_request(int cmd, struct ifaddr *ifa) 150 { 151 struct sockaddr_in6 all1_sa; 152 struct rt_addrinfo rtinfo; 153 int error; 154 155 bzero(&all1_sa, sizeof(all1_sa)); 156 all1_sa.sin6_family = AF_INET6; 157 all1_sa.sin6_len = sizeof(struct sockaddr_in6); 158 all1_sa.sin6_addr = in6mask128; 159 160 /* 161 * We specify the address itself as the gateway, and set the 162 * RTF_LLINFO flag, so that the corresponding host route would have 163 * the flag, and thus applications that assume traditional behavior 164 * would be happy. Note that we assume the caller of the function 165 * (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest, 166 * which changes the outgoing interface to the loopback interface. 167 */ 168 bzero(&rtinfo, sizeof(struct rt_addrinfo)); 169 rtinfo.rti_info[RTAX_DST] = ifa->ifa_addr; 170 rtinfo.rti_info[RTAX_GATEWAY] = ifa->ifa_addr; 171 rtinfo.rti_info[RTAX_NETMASK] = (struct sockaddr *)&all1_sa; 172 rtinfo.rti_flags = RTF_UP|RTF_HOST|RTF_LLINFO; 173 174 error = rtrequest1_global(cmd, &rtinfo, 175 in6_ifloop_request_callback, ifa); 176 if (error != 0) { 177 log(LOG_ERR, "in6_ifloop_request: " 178 "%s operation failed for %s (errno=%d)\n", 179 cmd == RTM_ADD ? "ADD" : "DELETE", 180 ip6_sprintf(&((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr), 181 error); 182 } 183 } 184 185 static void 186 in6_ifloop_request_callback(int cmd, int error, struct rt_addrinfo *rtinfo, 187 struct rtentry *rt, void *arg) 188 { 189 struct ifaddr *ifa = arg; 190 191 if (error) 192 goto done; 193 194 /* 195 * Make sure rt_ifa be equal to IFA, the second argument of the 196 * function. 197 * We need this because when we refer to rt_ifa->ia6_flags in 198 * ip6_input, we assume that the rt_ifa points to the address instead 199 * of the loopback address. 200 */ 201 if (cmd == RTM_ADD && rt && ifa != rt->rt_ifa) { 202 ++rt->rt_refcnt; 203 IFAFREE(rt->rt_ifa); 204 IFAREF(ifa); 205 rt->rt_ifa = ifa; 206 --rt->rt_refcnt; 207 } 208 209 /* 210 * Report the addition/removal of the address to the routing socket. 211 * XXX: since we called rtinit for a p2p interface with a destination, 212 * we end up reporting twice in such a case. Should we rather 213 * omit the second report? 214 */ 215 if (rt) { 216 if (mycpuid == 0) 217 rt_newaddrmsg(cmd, ifa, error, rt); 218 if (cmd == RTM_DELETE) { 219 if (rt->rt_refcnt == 0) { 220 ++rt->rt_refcnt; 221 rtfree(rt); 222 } 223 } 224 } 225 done: 226 /* no way to return any new error */ 227 ; 228 } 229 230 /* 231 * Add ownaddr as loopback rtentry. We previously add the route only if 232 * necessary (ex. on a p2p link). However, since we now manage addresses 233 * separately from prefixes, we should always add the route. We can't 234 * rely on the cloning mechanism from the corresponding interface route 235 * any more. 236 */ 237 void 238 in6_ifaddloop(struct ifaddr *ifa) 239 { 240 struct rtentry *rt; 241 242 /* If there is no loopback entry, allocate one. */ 243 rt = rtpurelookup(ifa->ifa_addr); 244 if (rt == NULL || !(rt->rt_flags & RTF_HOST) || 245 !(rt->rt_ifp->if_flags & IFF_LOOPBACK)) 246 in6_ifloop_request(RTM_ADD, ifa); 247 if (rt != NULL) 248 rt->rt_refcnt--; 249 } 250 251 /* 252 * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(), 253 * if it exists. 254 */ 255 void 256 in6_ifremloop(struct ifaddr *ifa) 257 { 258 struct in6_ifaddr *ia; 259 struct rtentry *rt; 260 int ia_count = 0; 261 262 /* 263 * Some of BSD variants do not remove cloned routes 264 * from an interface direct route, when removing the direct route 265 * (see comments in net/net_osdep.h). Even for variants that do remove 266 * cloned routes, they could fail to remove the cloned routes when 267 * we handle multple addresses that share a common prefix. 268 * So, we should remove the route corresponding to the deleted address 269 * regardless of the result of in6_is_ifloop_auto(). 270 */ 271 272 /* 273 * Delete the entry only if exact one ifa exists. More than one ifa 274 * can exist if we assign a same single address to multiple 275 * (probably p2p) interfaces. 276 * XXX: we should avoid such a configuration in IPv6... 277 */ 278 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 279 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) { 280 ia_count++; 281 if (ia_count > 1) 282 break; 283 } 284 } 285 286 if (ia_count == 1) { 287 /* 288 * Before deleting, check if a corresponding loopbacked host 289 * route surely exists. With this check, we can avoid to 290 * delete an interface direct route whose destination is same 291 * as the address being removed. This can happen when remofing 292 * a subnet-router anycast address on an interface attahced 293 * to a shared medium. 294 */ 295 rt = rtpurelookup(ifa->ifa_addr); 296 if (rt != NULL && (rt->rt_flags & RTF_HOST) && 297 (rt->rt_ifp->if_flags & IFF_LOOPBACK)) { 298 rt->rt_refcnt--; 299 in6_ifloop_request(RTM_DELETE, ifa); 300 } 301 } 302 } 303 304 int 305 in6_ifindex2scopeid(int idx) 306 { 307 struct ifnet *ifp; 308 struct sockaddr_in6 *sin6; 309 struct ifaddr_container *ifac; 310 311 if (idx < 0 || if_index < idx) 312 return -1; 313 ifp = ifindex2ifnet[idx]; 314 315 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) 316 { 317 struct ifaddr *ifa = ifac->ifa; 318 319 if (ifa->ifa_addr->sa_family != AF_INET6) 320 continue; 321 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 322 if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) 323 return sin6->sin6_scope_id & 0xffff; 324 } 325 326 return -1; 327 } 328 329 int 330 in6_mask2len(struct in6_addr *mask, u_char *lim0) 331 { 332 int x = 0, y; 333 u_char *lim = lim0, *p; 334 335 if (lim0 == NULL || 336 lim0 - (u_char *)mask > sizeof(*mask)) /* ignore the scope_id part */ 337 lim = (u_char *)mask + sizeof(*mask); 338 for (p = (u_char *)mask; p < lim; x++, p++) { 339 if (*p != 0xff) 340 break; 341 } 342 y = 0; 343 if (p < lim) { 344 for (y = 0; y < 8; y++) { 345 if ((*p & (0x80 >> y)) == 0) 346 break; 347 } 348 } 349 350 /* 351 * when the limit pointer is given, do a stricter check on the 352 * remaining bits. 353 */ 354 if (p < lim) { 355 if (y != 0 && (*p & (0x00ff >> y)) != 0) 356 return (-1); 357 for (p = p + 1; p < lim; p++) 358 if (*p != 0) 359 return (-1); 360 } 361 362 return x * 8 + y; 363 } 364 365 void 366 in6_len2mask(struct in6_addr *mask, int len) 367 { 368 int i; 369 370 bzero(mask, sizeof(*mask)); 371 for (i = 0; i < len / 8; i++) 372 mask->s6_addr8[i] = 0xff; 373 if (len % 8) 374 mask->s6_addr8[i] = (0xff00 >> (len % 8)) & 0xff; 375 } 376 377 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 378 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 379 380 void 381 in6_control_dispatch(netmsg_t msg) 382 { 383 int error; 384 385 error = in6_control(msg->control.base.nm_so, 386 msg->control.nm_cmd, 387 msg->control.nm_data, 388 msg->control.nm_ifp, 389 msg->control.nm_td); 390 lwkt_replymsg(&msg->control.base.lmsg, error); 391 } 392 393 int 394 in6_control(struct socket *so, u_long cmd, caddr_t data, 395 struct ifnet *ifp, struct thread *td) 396 { 397 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 398 struct in6_ifaddr *ia = NULL; 399 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 400 int privileged; 401 int error; 402 403 privileged = 0; 404 if (priv_check(td, PRIV_ROOT) == 0) 405 privileged++; 406 407 switch (cmd) { 408 case SIOCGETSGCNT_IN6: 409 case SIOCGETMIFCNT_IN6: 410 return (mrt6_ioctl(cmd, data)); 411 } 412 413 switch(cmd) { 414 case SIOCAADDRCTL_POLICY: 415 case SIOCDADDRCTL_POLICY: 416 if (!privileged) 417 return (EPERM); 418 return (in6_src_ioctl(cmd, data)); 419 } 420 421 if (ifp == NULL) 422 return (EOPNOTSUPP); 423 424 switch (cmd) { 425 case SIOCSNDFLUSH_IN6: 426 case SIOCSPFXFLUSH_IN6: 427 case SIOCSRTRFLUSH_IN6: 428 case SIOCSDEFIFACE_IN6: 429 case SIOCSIFINFO_FLAGS: 430 if (!privileged) 431 return (EPERM); 432 /* fall through */ 433 case OSIOCGIFINFO_IN6: 434 case SIOCGIFINFO_IN6: 435 case SIOCGDRLST_IN6: 436 case SIOCGPRLST_IN6: 437 case SIOCGNBRINFO_IN6: 438 case SIOCGDEFIFACE_IN6: 439 return (nd6_ioctl(cmd, data, ifp)); 440 } 441 442 switch (cmd) { 443 case SIOCSIFPREFIX_IN6: 444 case SIOCDIFPREFIX_IN6: 445 case SIOCAIFPREFIX_IN6: 446 case SIOCCIFPREFIX_IN6: 447 case SIOCSGIFPREFIX_IN6: 448 case SIOCGIFPREFIX_IN6: 449 log(LOG_NOTICE, 450 "prefix ioctls are now invalidated. " 451 "please use ifconfig.\n"); 452 return (EOPNOTSUPP); 453 } 454 455 switch (cmd) { 456 case SIOCSSCOPE6: 457 if (!privileged) 458 return (EPERM); 459 return (scope6_set(ifp, 460 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 461 break; 462 case SIOCGSCOPE6: 463 return (scope6_get(ifp, 464 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 465 break; 466 case SIOCGSCOPE6DEF: 467 return (scope6_get_default((struct scope6_id *) 468 ifr->ifr_ifru.ifru_scope_id)); 469 break; 470 } 471 472 switch (cmd) { 473 case SIOCALIFADDR: 474 case SIOCDLIFADDR: 475 if (!privileged) 476 return (EPERM); 477 /* fall through */ 478 case SIOCGLIFADDR: 479 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 480 } 481 482 /* 483 * Find address for this interface, if it exists. 484 */ 485 if (ifra->ifra_addr.sin6_family == AF_INET6) { /* XXX */ 486 struct sockaddr_in6 *sa6 = 487 (struct sockaddr_in6 *)&ifra->ifra_addr; 488 489 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) { 490 if (sa6->sin6_addr.s6_addr16[1] == 0) { 491 /* link ID is not embedded by the user */ 492 sa6->sin6_addr.s6_addr16[1] = 493 htons(ifp->if_index); 494 } else if (sa6->sin6_addr.s6_addr16[1] != 495 htons(ifp->if_index)) { 496 return (EINVAL); /* link ID contradicts */ 497 } 498 if (sa6->sin6_scope_id) { 499 if (sa6->sin6_scope_id != 500 (u_int32_t)ifp->if_index) 501 return (EINVAL); 502 sa6->sin6_scope_id = 0; /* XXX: good way? */ 503 } 504 } 505 ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr); 506 } 507 508 switch (cmd) { 509 case SIOCSIFADDR_IN6: 510 case SIOCSIFDSTADDR_IN6: 511 case SIOCSIFNETMASK_IN6: 512 /* 513 * Since IPv6 allows a node to assign multiple addresses 514 * on a single interface, SIOCSIFxxx ioctls are not suitable 515 * and should be unused. 516 */ 517 /* we decided to obsolete this command (20000704) */ 518 return (EINVAL); 519 520 case SIOCDIFADDR_IN6: 521 /* 522 * for IPv4, we look for existing in_ifaddr here to allow 523 * "ifconfig if0 delete" to remove first IPv4 address on the 524 * interface. For IPv6, as the spec allow multiple interface 525 * address from the day one, we consider "remove the first one" 526 * semantics to be not preferable. 527 */ 528 if (ia == NULL) 529 return (EADDRNOTAVAIL); 530 /* FALLTHROUGH */ 531 case SIOCAIFADDR_IN6: 532 /* 533 * We always require users to specify a valid IPv6 address for 534 * the corresponding operation. 535 */ 536 if (ifra->ifra_addr.sin6_family != AF_INET6 || 537 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) 538 return (EAFNOSUPPORT); 539 if (!privileged) 540 return (EPERM); 541 542 break; 543 544 case SIOCGIFADDR_IN6: 545 /* This interface is basically deprecated. use SIOCGIFCONF. */ 546 /* fall through */ 547 case SIOCGIFAFLAG_IN6: 548 case SIOCGIFNETMASK_IN6: 549 case SIOCGIFDSTADDR_IN6: 550 case SIOCGIFALIFETIME_IN6: 551 /* must think again about its semantics */ 552 if (ia == NULL) 553 return (EADDRNOTAVAIL); 554 break; 555 case SIOCSIFALIFETIME_IN6: 556 { 557 struct in6_addrlifetime *lt; 558 559 if (!privileged) 560 return (EPERM); 561 if (ia == NULL) 562 return (EADDRNOTAVAIL); 563 /* sanity for overflow - beware unsigned */ 564 lt = &ifr->ifr_ifru.ifru_lifetime; 565 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME 566 && lt->ia6t_vltime + time_second < time_second) { 567 return EINVAL; 568 } 569 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME 570 && lt->ia6t_pltime + time_second < time_second) { 571 return EINVAL; 572 } 573 break; 574 } 575 } 576 577 switch (cmd) { 578 579 case SIOCGIFADDR_IN6: 580 ifr->ifr_addr = ia->ia_addr; 581 break; 582 583 case SIOCGIFDSTADDR_IN6: 584 if (!(ifp->if_flags & IFF_POINTOPOINT)) 585 return (EINVAL); 586 /* 587 * XXX: should we check if ifa_dstaddr is NULL and return 588 * an error? 589 */ 590 ifr->ifr_dstaddr = ia->ia_dstaddr; 591 break; 592 593 case SIOCGIFNETMASK_IN6: 594 ifr->ifr_addr = ia->ia_prefixmask; 595 break; 596 597 case SIOCGIFAFLAG_IN6: 598 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 599 break; 600 601 case SIOCGIFSTAT_IN6: 602 if (ifp == NULL) 603 return EINVAL; 604 bzero(&ifr->ifr_ifru.ifru_stat, 605 sizeof(ifr->ifr_ifru.ifru_stat)); 606 ifr->ifr_ifru.ifru_stat = 607 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat; 608 break; 609 610 case SIOCGIFSTAT_ICMP6: 611 bzero(&ifr->ifr_ifru.ifru_stat, 612 sizeof(ifr->ifr_ifru.ifru_icmp6stat)); 613 ifr->ifr_ifru.ifru_icmp6stat = 614 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat; 615 break; 616 617 case SIOCGIFALIFETIME_IN6: 618 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 619 break; 620 621 case SIOCSIFALIFETIME_IN6: 622 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; 623 /* for sanity */ 624 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 625 ia->ia6_lifetime.ia6t_expire = 626 time_second + ia->ia6_lifetime.ia6t_vltime; 627 } else 628 ia->ia6_lifetime.ia6t_expire = 0; 629 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 630 ia->ia6_lifetime.ia6t_preferred = 631 time_second + ia->ia6_lifetime.ia6t_pltime; 632 } else 633 ia->ia6_lifetime.ia6t_preferred = 0; 634 break; 635 636 case SIOCAIFADDR_IN6: 637 { 638 int i, error = 0, iaIsNew; 639 struct nd_prefix pr0, *pr; 640 641 if (ia != NULL) 642 iaIsNew = 0; 643 else 644 iaIsNew = 1; 645 646 /* 647 * first, make or update the interface address structure, 648 * and link it to the list. 649 */ 650 if ((error = in6_update_ifa(ifp, ifra, ia)) != 0) 651 return (error); 652 653 /* 654 * then, make the prefix on-link on the interface. 655 * XXX: we'd rather create the prefix before the address, but 656 * we need at least one address to install the corresponding 657 * interface route, so we configure the address first. 658 */ 659 660 /* 661 * convert mask to prefix length (prefixmask has already 662 * been validated in in6_update_ifa(). 663 */ 664 bzero(&pr0, sizeof(pr0)); 665 pr0.ndpr_ifp = ifp; 666 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 667 NULL); 668 if (pr0.ndpr_plen == 128) 669 break; /* we don't need to install a host route. */ 670 pr0.ndpr_prefix = ifra->ifra_addr; 671 pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr; 672 /* apply the mask for safety. */ 673 for (i = 0; i < 4; i++) { 674 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 675 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i]; 676 } 677 /* 678 * XXX: since we don't have an API to set prefix (not address) 679 * lifetimes, we just use the same lifetimes as addresses. 680 * The (temporarily) installed lifetimes can be overridden by 681 * later advertised RAs (when accept_rtadv is non 0), which is 682 * an intended behavior. 683 */ 684 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 685 pr0.ndpr_raf_auto = 686 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 687 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 688 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 689 690 /* add the prefix if there's one. */ 691 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 692 /* 693 * nd6_prelist_add will install the corresponding 694 * interface route. 695 */ 696 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) 697 return (error); 698 if (pr == NULL) { 699 log(LOG_ERR, "nd6_prelist_add succeeded but " 700 "no prefix\n"); 701 return (EINVAL); /* XXX panic here? */ 702 } 703 } 704 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 705 == NULL) { 706 /* XXX: this should not happen! */ 707 log(LOG_ERR, "in6_control: addition succeeded, but" 708 " no ifaddr\n"); 709 } else { 710 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 711 ia->ia6_ndpr == NULL) { /* new autoconfed addr */ 712 ia->ia6_ndpr = pr; 713 pr->ndpr_refcnt++; 714 715 /* 716 * If this is the first autoconf address from 717 * the prefix, create a temporary address 718 * as well (when specified). 719 */ 720 if (ip6_use_tempaddr && 721 pr->ndpr_refcnt == 1) { 722 int e; 723 if ((e = in6_tmpifadd(ia, 1)) != 0) { 724 log(LOG_NOTICE, "in6_control: " 725 "failed to create a " 726 "temporary address, " 727 "errno=%d\n", 728 e); 729 } 730 } 731 } 732 733 /* 734 * this might affect the status of autoconfigured 735 * addresses, that is, this address might make 736 * other addresses detached. 737 */ 738 pfxlist_onlink_check(); 739 } 740 if (error == 0 && ia) { 741 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 742 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 743 &ia->ia_ifa); 744 } 745 break; 746 } 747 748 case SIOCDIFADDR_IN6: 749 { 750 int i = 0; 751 struct nd_prefix pr0, *pr; 752 753 /* 754 * If the address being deleted is the only one that owns 755 * the corresponding prefix, expire the prefix as well. 756 * XXX: theoretically, we don't have to warry about such 757 * relationship, since we separate the address management 758 * and the prefix management. We do this, however, to provide 759 * as much backward compatibility as possible in terms of 760 * the ioctl operation. 761 */ 762 bzero(&pr0, sizeof(pr0)); 763 pr0.ndpr_ifp = ifp; 764 pr0.ndpr_plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, 765 NULL); 766 if (pr0.ndpr_plen == 128) 767 goto purgeaddr; 768 pr0.ndpr_prefix = ia->ia_addr; 769 pr0.ndpr_mask = ia->ia_prefixmask.sin6_addr; 770 for (i = 0; i < 4; i++) { 771 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 772 ia->ia_prefixmask.sin6_addr.s6_addr32[i]; 773 } 774 /* 775 * The logic of the following condition is a bit complicated. 776 * We expire the prefix when 777 * 1. the address obeys autoconfiguration and it is the 778 * only owner of the associated prefix, or 779 * 2. the address does not obey autoconf and there is no 780 * other owner of the prefix. 781 */ 782 if ((pr = nd6_prefix_lookup(&pr0)) != NULL && 783 (((ia->ia6_flags & IN6_IFF_AUTOCONF) && 784 pr->ndpr_refcnt == 1) || 785 (!(ia->ia6_flags & IN6_IFF_AUTOCONF) && 786 pr->ndpr_refcnt == 0))) { 787 pr->ndpr_expire = 1; /* XXX: just for expiration */ 788 } 789 790 purgeaddr: 791 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE, 792 &ia->ia_ifa); 793 in6_purgeaddr(&ia->ia_ifa); 794 break; 795 } 796 797 default: 798 if (ifp == NULL || ifp->if_ioctl == 0) 799 return (EOPNOTSUPP); 800 ifnet_serialize_all(ifp); 801 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred); 802 ifnet_deserialize_all(ifp); 803 return (error); 804 } 805 806 return (0); 807 } 808 809 /* 810 * Update parameters of an IPv6 interface address. 811 * If necessary, a new entry is created and linked into address chains. 812 * This function is separated from in6_control(). 813 * XXX: should this be performed under splnet()? 814 */ 815 int 816 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 817 struct in6_ifaddr *ia) 818 { 819 int error = 0, hostIsNew = 0, plen = -1; 820 struct in6_ifaddr *oia; 821 struct sockaddr_in6 dst6; 822 struct in6_addrlifetime *lt; 823 824 /* Validate parameters */ 825 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 826 return (EINVAL); 827 828 /* 829 * The destination address for a p2p link must have a family 830 * of AF_UNSPEC or AF_INET6. 831 */ 832 if ((ifp->if_flags & IFF_POINTOPOINT) && 833 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 834 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 835 return (EAFNOSUPPORT); 836 /* 837 * validate ifra_prefixmask. don't check sin6_family, netmask 838 * does not carry fields other than sin6_len. 839 */ 840 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 841 return (EINVAL); 842 /* 843 * Because the IPv6 address architecture is classless, we require 844 * users to specify a (non 0) prefix length (mask) for a new address. 845 * We also require the prefix (when specified) mask is valid, and thus 846 * reject a non-consecutive mask. 847 */ 848 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 849 return (EINVAL); 850 if (ifra->ifra_prefixmask.sin6_len != 0) { 851 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 852 (u_char *)&ifra->ifra_prefixmask + 853 ifra->ifra_prefixmask.sin6_len); 854 if (plen <= 0) 855 return (EINVAL); 856 } 857 else { 858 /* 859 * In this case, ia must not be NULL. We just use its prefix 860 * length. 861 */ 862 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 863 } 864 /* 865 * If the destination address on a p2p interface is specified, 866 * and the address is a scoped one, validate/set the scope 867 * zone identifier. 868 */ 869 dst6 = ifra->ifra_dstaddr; 870 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) && 871 (dst6.sin6_family == AF_INET6)) { 872 int scopeid; 873 874 if ((error = in6_recoverscope(&dst6, 875 &ifra->ifra_dstaddr.sin6_addr, 876 ifp)) != 0) 877 return (error); 878 scopeid = in6_addr2scopeid(ifp, &dst6.sin6_addr); 879 if (dst6.sin6_scope_id == 0) /* user omit to specify the ID. */ 880 dst6.sin6_scope_id = scopeid; 881 else if (dst6.sin6_scope_id != scopeid) 882 return (EINVAL); /* scope ID mismatch. */ 883 if ((error = in6_embedscope(&dst6.sin6_addr, &dst6, NULL, NULL)) 884 != 0) 885 return (error); 886 dst6.sin6_scope_id = 0; /* XXX */ 887 } 888 /* 889 * The destination address can be specified only for a p2p or a 890 * loopback interface. If specified, the corresponding prefix length 891 * must be 128. 892 */ 893 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 894 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0) { 895 /* XXX: noisy message */ 896 log(LOG_INFO, "in6_update_ifa: a destination can be " 897 "specified for a p2p or a loopback IF only\n"); 898 return (EINVAL); 899 } 900 if (plen != 128) { 901 /* 902 * The following message seems noisy, but we dare to 903 * add it for diagnosis. 904 */ 905 log(LOG_INFO, "in6_update_ifa: prefixlen must be 128 " 906 "when dstaddr is specified\n"); 907 return (EINVAL); 908 } 909 } 910 /* lifetime consistency check */ 911 lt = &ifra->ifra_lifetime; 912 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME 913 && lt->ia6t_vltime + time_second < time_second) { 914 return EINVAL; 915 } 916 if (lt->ia6t_vltime == 0) { 917 /* 918 * the following log might be noisy, but this is a typical 919 * configuration mistake or a tool's bug. 920 */ 921 log(LOG_INFO, 922 "in6_update_ifa: valid lifetime is 0 for %s\n", 923 ip6_sprintf(&ifra->ifra_addr.sin6_addr)); 924 } 925 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME 926 && lt->ia6t_pltime + time_second < time_second) { 927 return EINVAL; 928 } 929 930 /* 931 * If this is a new address, allocate a new ifaddr and link it 932 * into chains. 933 */ 934 if (ia == NULL) { 935 hostIsNew = 1; 936 /* 937 * When in6_update_ifa() is called in a process of a received 938 * RA, it is called under splnet(). So, we should call malloc 939 * with M_NOWAIT. 940 */ 941 ia = ifa_create(sizeof(*ia), M_NOWAIT); 942 if (ia == NULL) 943 return (ENOBUFS); 944 /* Initialize the address and masks */ 945 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 946 ia->ia_addr.sin6_family = AF_INET6; 947 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 948 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 949 /* 950 * XXX: some functions expect that ifa_dstaddr is not 951 * NULL for p2p interfaces. 952 */ 953 ia->ia_ifa.ifa_dstaddr 954 = (struct sockaddr *)&ia->ia_dstaddr; 955 } else { 956 ia->ia_ifa.ifa_dstaddr = NULL; 957 } 958 ia->ia_ifa.ifa_netmask 959 = (struct sockaddr *)&ia->ia_prefixmask; 960 961 ia->ia_ifp = ifp; 962 if ((oia = in6_ifaddr) != NULL) { 963 for ( ; oia->ia_next; oia = oia->ia_next) 964 continue; 965 oia->ia_next = ia; 966 } else 967 in6_ifaddr = ia; 968 969 ifa_iflink(&ia->ia_ifa, ifp, 1); 970 } 971 972 /* set prefix mask */ 973 if (ifra->ifra_prefixmask.sin6_len) { 974 /* 975 * We prohibit changing the prefix length of an existing 976 * address, because 977 * + such an operation should be rare in IPv6, and 978 * + the operation would confuse prefix management. 979 */ 980 if (ia->ia_prefixmask.sin6_len && 981 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 982 log(LOG_INFO, "in6_update_ifa: the prefix length of an" 983 " existing (%s) address should not be changed\n", 984 ip6_sprintf(&ia->ia_addr.sin6_addr)); 985 error = EINVAL; 986 goto unlink; 987 } 988 ia->ia_prefixmask = ifra->ifra_prefixmask; 989 } 990 991 /* 992 * If a new destination address is specified, scrub the old one and 993 * install the new destination. Note that the interface must be 994 * p2p or loopback (see the check above.) 995 */ 996 if (dst6.sin6_family == AF_INET6 && 997 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, 998 &ia->ia_dstaddr.sin6_addr)) { 999 int e; 1000 1001 if ((ia->ia_flags & IFA_ROUTE) && 1002 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 1003 != 0) { 1004 log(LOG_ERR, "in6_update_ifa: failed to remove " 1005 "a route to the old destination: %s\n", 1006 ip6_sprintf(&ia->ia_addr.sin6_addr)); 1007 /* proceed anyway... */ 1008 } 1009 else 1010 ia->ia_flags &= ~IFA_ROUTE; 1011 ia->ia_dstaddr = dst6; 1012 } 1013 1014 /* reset the interface and routing table appropriately. */ 1015 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 1016 goto unlink; 1017 1018 /* 1019 * Beyond this point, we should call in6_purgeaddr upon an error, 1020 * not just go to unlink. 1021 */ 1022 1023 #if 0 /* disable this mechanism for now */ 1024 /* update prefix list */ 1025 if (hostIsNew && 1026 (ifra->ifra_flags & IN6_IFF_NOPFX) == 0) { /* XXX */ 1027 int iilen; 1028 1029 iilen = (sizeof(ia->ia_prefixmask.sin6_addr) << 3) - plen; 1030 if ((error = in6_prefix_add_ifid(iilen, ia)) != 0) { 1031 in6_purgeaddr((struct ifaddr *)ia); 1032 return (error); 1033 } 1034 } 1035 #endif 1036 1037 if (ifp->if_flags & IFF_MULTICAST) { 1038 struct sockaddr_in6 mltaddr, mltmask; 1039 struct in6_multi *in6m; 1040 1041 if (hostIsNew) { 1042 /* 1043 * join solicited multicast addr for new host id 1044 */ 1045 struct in6_addr llsol; 1046 bzero(&llsol, sizeof(struct in6_addr)); 1047 llsol.s6_addr16[0] = htons(0xff02); 1048 llsol.s6_addr16[1] = htons(ifp->if_index); 1049 llsol.s6_addr32[1] = 0; 1050 llsol.s6_addr32[2] = htonl(1); 1051 llsol.s6_addr32[3] = 1052 ifra->ifra_addr.sin6_addr.s6_addr32[3]; 1053 llsol.s6_addr8[12] = 0xff; 1054 in6_addmulti(&llsol, ifp, &error); 1055 if (error != 0) { 1056 log(LOG_WARNING, 1057 "in6_update_ifa: addmulti failed for " 1058 "%s on %s (errno=%d)\n", 1059 ip6_sprintf(&llsol), if_name(ifp), 1060 error); 1061 in6_purgeaddr((struct ifaddr *)ia); 1062 return (error); 1063 } 1064 } 1065 1066 bzero(&mltmask, sizeof(mltmask)); 1067 mltmask.sin6_len = sizeof(struct sockaddr_in6); 1068 mltmask.sin6_family = AF_INET6; 1069 mltmask.sin6_addr = in6mask32; 1070 1071 /* 1072 * join link-local all-nodes address 1073 */ 1074 bzero(&mltaddr, sizeof(mltaddr)); 1075 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 1076 mltaddr.sin6_family = AF_INET6; 1077 mltaddr.sin6_addr = kin6addr_linklocal_allnodes; 1078 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1079 1080 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1081 if (in6m == NULL) { 1082 rtrequest_global(RTM_ADD, 1083 (struct sockaddr *)&mltaddr, 1084 (struct sockaddr *)&ia->ia_addr, 1085 (struct sockaddr *)&mltmask, 1086 RTF_UP|RTF_CLONING); /* xxx */ 1087 in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 1088 if (error != 0) { 1089 log(LOG_WARNING, 1090 "in6_update_ifa: addmulti failed for " 1091 "%s on %s (errno=%d)\n", 1092 ip6_sprintf(&mltaddr.sin6_addr), 1093 if_name(ifp), error); 1094 } 1095 } 1096 1097 /* 1098 * join node information group address 1099 */ 1100 #define hostnamelen strlen(hostname) 1101 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr.sin6_addr) 1102 == 0) { 1103 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1104 if (in6m == NULL && ia != NULL) { 1105 in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 1106 if (error != 0) { 1107 log(LOG_WARNING, "in6_update_ifa: " 1108 "addmulti failed for " 1109 "%s on %s (errno=%d)\n", 1110 ip6_sprintf(&mltaddr.sin6_addr), 1111 if_name(ifp), error); 1112 } 1113 } 1114 } 1115 #undef hostnamelen 1116 1117 /* 1118 * join node-local all-nodes address, on loopback. 1119 * XXX: since "node-local" is obsoleted by interface-local, 1120 * we have to join the group on every interface with 1121 * some interface-boundary restriction. 1122 */ 1123 if (ifp->if_flags & IFF_LOOPBACK) { 1124 struct in6_ifaddr *ia_loop; 1125 1126 struct in6_addr loop6 = kin6addr_loopback; 1127 ia_loop = in6ifa_ifpwithaddr(ifp, &loop6); 1128 1129 mltaddr.sin6_addr = kin6addr_nodelocal_allnodes; 1130 1131 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1132 if (in6m == NULL && ia_loop != NULL) { 1133 rtrequest_global(RTM_ADD, 1134 (struct sockaddr *)&mltaddr, 1135 (struct sockaddr *)&ia_loop->ia_addr, 1136 (struct sockaddr *)&mltmask, 1137 RTF_UP); 1138 in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 1139 if (error != 0) { 1140 log(LOG_WARNING, "in6_update_ifa: " 1141 "addmulti failed for %s on %s " 1142 "(errno=%d)\n", 1143 ip6_sprintf(&mltaddr.sin6_addr), 1144 if_name(ifp), error); 1145 } 1146 } 1147 } 1148 } 1149 1150 ia->ia6_flags = ifra->ifra_flags; 1151 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /*safety*/ 1152 ia->ia6_flags &= ~IN6_IFF_NODAD; /* Mobile IPv6 */ 1153 1154 ia->ia6_lifetime = ifra->ifra_lifetime; 1155 /* for sanity */ 1156 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1157 ia->ia6_lifetime.ia6t_expire = 1158 time_second + ia->ia6_lifetime.ia6t_vltime; 1159 } else 1160 ia->ia6_lifetime.ia6t_expire = 0; 1161 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1162 ia->ia6_lifetime.ia6t_preferred = 1163 time_second + ia->ia6_lifetime.ia6t_pltime; 1164 } else 1165 ia->ia6_lifetime.ia6t_preferred = 0; 1166 1167 /* 1168 * Perform DAD, if needed. 1169 * XXX It may be of use, if we can administratively 1170 * disable DAD. 1171 */ 1172 if (in6if_do_dad(ifp) && !(ifra->ifra_flags & IN6_IFF_NODAD)) { 1173 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1174 nd6_dad_start((struct ifaddr *)ia, NULL); 1175 } 1176 1177 return (error); 1178 1179 unlink: 1180 /* 1181 * XXX: if a change of an existing address failed, keep the entry 1182 * anyway. 1183 */ 1184 if (hostIsNew) 1185 in6_unlink_ifa(ia, ifp); 1186 return (error); 1187 } 1188 1189 void 1190 in6_purgeaddr(struct ifaddr *ifa) 1191 { 1192 struct ifnet *ifp = ifa->ifa_ifp; 1193 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1194 1195 /* stop DAD processing */ 1196 nd6_dad_stop(ifa); 1197 1198 /* 1199 * delete route to the destination of the address being purged. 1200 * The interface must be p2p or loopback in this case. 1201 */ 1202 if ((ia->ia_flags & IFA_ROUTE) && ia->ia_dstaddr.sin6_len != 0) { 1203 int e; 1204 1205 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 1206 != 0) { 1207 log(LOG_ERR, "in6_purgeaddr: failed to remove " 1208 "a route to the p2p destination: %s on %s, " 1209 "errno=%d\n", 1210 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp), 1211 e); 1212 /* proceed anyway... */ 1213 } 1214 else 1215 ia->ia_flags &= ~IFA_ROUTE; 1216 } 1217 1218 /* Remove ownaddr's loopback rtentry, if it exists. */ 1219 in6_ifremloop(&(ia->ia_ifa)); 1220 1221 if (ifp->if_flags & IFF_MULTICAST) { 1222 /* 1223 * delete solicited multicast addr for deleting host id 1224 */ 1225 struct in6_multi *in6m; 1226 struct in6_addr llsol; 1227 bzero(&llsol, sizeof(struct in6_addr)); 1228 llsol.s6_addr16[0] = htons(0xff02); 1229 llsol.s6_addr16[1] = htons(ifp->if_index); 1230 llsol.s6_addr32[1] = 0; 1231 llsol.s6_addr32[2] = htonl(1); 1232 llsol.s6_addr32[3] = 1233 ia->ia_addr.sin6_addr.s6_addr32[3]; 1234 llsol.s6_addr8[12] = 0xff; 1235 1236 IN6_LOOKUP_MULTI(llsol, ifp, in6m); 1237 if (in6m) 1238 in6_delmulti(in6m); 1239 } 1240 1241 in6_unlink_ifa(ia, ifp); 1242 } 1243 1244 static void 1245 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1246 { 1247 int plen, iilen; 1248 struct in6_ifaddr *oia; 1249 1250 crit_enter(); 1251 1252 ifa_ifunlink(&ia->ia_ifa, ifp); 1253 1254 oia = ia; 1255 if (oia == (ia = in6_ifaddr)) 1256 in6_ifaddr = ia->ia_next; 1257 else { 1258 while (ia->ia_next && (ia->ia_next != oia)) 1259 ia = ia->ia_next; 1260 if (ia->ia_next) 1261 ia->ia_next = oia->ia_next; 1262 else { 1263 /* search failed */ 1264 kprintf("Couldn't unlink in6_ifaddr from in6_ifaddr\n"); 1265 } 1266 } 1267 1268 if (oia->ia6_ifpr) { /* check for safety */ 1269 plen = in6_mask2len(&oia->ia_prefixmask.sin6_addr, NULL); 1270 iilen = (sizeof(oia->ia_prefixmask.sin6_addr) << 3) - plen; 1271 in6_prefix_remove_ifid(iilen, oia); 1272 } 1273 1274 /* 1275 * When an autoconfigured address is being removed, release the 1276 * reference to the base prefix. Also, since the release might 1277 * affect the status of other (detached) addresses, call 1278 * pfxlist_onlink_check(). 1279 */ 1280 if (oia->ia6_flags & IN6_IFF_AUTOCONF) { 1281 if (oia->ia6_ndpr == NULL) { 1282 log(LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address " 1283 "%p has no prefix\n", oia); 1284 } else { 1285 oia->ia6_ndpr->ndpr_refcnt--; 1286 oia->ia6_flags &= ~IN6_IFF_AUTOCONF; 1287 oia->ia6_ndpr = NULL; 1288 } 1289 1290 pfxlist_onlink_check(); 1291 } 1292 1293 /* 1294 * release another refcnt for the link from in6_ifaddr. 1295 * Note that we should decrement the refcnt at least once for all *BSD. 1296 */ 1297 ifa_destroy(&oia->ia_ifa); 1298 1299 crit_exit(); 1300 } 1301 1302 void 1303 in6_purgeif(struct ifnet *ifp) 1304 { 1305 struct ifaddr_container *ifac, *next; 1306 1307 TAILQ_FOREACH_MUTABLE(ifac, &ifp->if_addrheads[mycpuid], 1308 ifa_link, next) { 1309 if (ifac->ifa->ifa_addr->sa_family != AF_INET6) 1310 continue; 1311 in6_purgeaddr(ifac->ifa); 1312 } 1313 1314 in6_ifdetach(ifp); 1315 } 1316 1317 /* 1318 * SIOC[GAD]LIFADDR. 1319 * SIOCGLIFADDR: get first address. (?) 1320 * SIOCGLIFADDR with IFLR_PREFIX: 1321 * get first address that matches the specified prefix. 1322 * SIOCALIFADDR: add the specified address. 1323 * SIOCALIFADDR with IFLR_PREFIX: 1324 * add the specified prefix, filling hostid part from 1325 * the first link-local address. prefixlen must be <= 64. 1326 * SIOCDLIFADDR: delete the specified address. 1327 * SIOCDLIFADDR with IFLR_PREFIX: 1328 * delete the first address that matches the specified prefix. 1329 * return values: 1330 * EINVAL on invalid parameters 1331 * EADDRNOTAVAIL on prefix match failed/specified address not found 1332 * other values may be returned from in6_ioctl() 1333 * 1334 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1335 * this is to accomodate address naming scheme other than RFC2374, 1336 * in the future. 1337 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1338 * address encoding scheme. (see figure on page 8) 1339 */ 1340 static int 1341 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 1342 struct ifnet *ifp, struct thread *td) 1343 { 1344 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1345 struct sockaddr *sa; 1346 1347 /* sanity checks */ 1348 if (!data || !ifp) { 1349 panic("invalid argument to in6_lifaddr_ioctl"); 1350 /*NOTRECHED*/ 1351 } 1352 1353 switch (cmd) { 1354 case SIOCGLIFADDR: 1355 /* address must be specified on GET with IFLR_PREFIX */ 1356 if (!(iflr->flags & IFLR_PREFIX)) 1357 break; 1358 /* FALLTHROUGH */ 1359 case SIOCALIFADDR: 1360 case SIOCDLIFADDR: 1361 /* address must be specified on ADD and DELETE */ 1362 sa = (struct sockaddr *)&iflr->addr; 1363 if (sa->sa_family != AF_INET6) 1364 return EINVAL; 1365 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1366 return EINVAL; 1367 /* XXX need improvement */ 1368 sa = (struct sockaddr *)&iflr->dstaddr; 1369 if (sa->sa_family && sa->sa_family != AF_INET6) 1370 return EINVAL; 1371 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1372 return EINVAL; 1373 break; 1374 default: /* shouldn't happen */ 1375 #if 0 1376 panic("invalid cmd to in6_lifaddr_ioctl"); 1377 /* NOTREACHED */ 1378 #else 1379 return EOPNOTSUPP; 1380 #endif 1381 } 1382 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) 1383 return EINVAL; 1384 1385 switch (cmd) { 1386 case SIOCALIFADDR: 1387 { 1388 struct in6_aliasreq ifra; 1389 struct in6_addr *hostid = NULL; 1390 int prefixlen; 1391 1392 if (iflr->flags & IFLR_PREFIX) { 1393 struct ifaddr *ifa; 1394 struct sockaddr_in6 *sin6; 1395 1396 /* 1397 * hostid is to fill in the hostid part of the 1398 * address. hostid points to the first link-local 1399 * address attached to the interface. 1400 */ 1401 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1402 if (!ifa) 1403 return EADDRNOTAVAIL; 1404 hostid = IFA_IN6(ifa); 1405 1406 /* prefixlen must be <= 64. */ 1407 if (64 < iflr->prefixlen) 1408 return EINVAL; 1409 prefixlen = iflr->prefixlen; 1410 1411 /* hostid part must be zero. */ 1412 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1413 if (sin6->sin6_addr.s6_addr32[2] != 0 1414 || sin6->sin6_addr.s6_addr32[3] != 0) { 1415 return EINVAL; 1416 } 1417 } else 1418 prefixlen = iflr->prefixlen; 1419 1420 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1421 bzero(&ifra, sizeof(ifra)); 1422 bcopy(iflr->iflr_name, ifra.ifra_name, 1423 sizeof(ifra.ifra_name)); 1424 1425 bcopy(&iflr->addr, &ifra.ifra_addr, 1426 ((struct sockaddr *)&iflr->addr)->sa_len); 1427 if (hostid) { 1428 /* fill in hostid part */ 1429 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1430 hostid->s6_addr32[2]; 1431 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1432 hostid->s6_addr32[3]; 1433 } 1434 1435 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/ 1436 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1437 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1438 if (hostid) { 1439 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1440 hostid->s6_addr32[2]; 1441 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1442 hostid->s6_addr32[3]; 1443 } 1444 } 1445 1446 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1447 in6_len2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1448 1449 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1450 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td); 1451 } 1452 case SIOCGLIFADDR: 1453 case SIOCDLIFADDR: 1454 { 1455 struct ifaddr_container *ifac; 1456 struct in6_ifaddr *ia; 1457 struct in6_addr mask, candidate, match; 1458 struct sockaddr_in6 *sin6; 1459 int cmp; 1460 1461 bzero(&mask, sizeof(mask)); 1462 if (iflr->flags & IFLR_PREFIX) { 1463 /* lookup a prefix rather than address. */ 1464 in6_len2mask(&mask, iflr->prefixlen); 1465 1466 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1467 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1468 match.s6_addr32[0] &= mask.s6_addr32[0]; 1469 match.s6_addr32[1] &= mask.s6_addr32[1]; 1470 match.s6_addr32[2] &= mask.s6_addr32[2]; 1471 match.s6_addr32[3] &= mask.s6_addr32[3]; 1472 1473 /* if you set extra bits, that's wrong */ 1474 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1475 return EINVAL; 1476 1477 cmp = 1; 1478 } else { 1479 if (cmd == SIOCGLIFADDR) { 1480 /* on getting an address, take the 1st match */ 1481 cmp = 0; /* XXX */ 1482 } else { 1483 /* on deleting an address, do exact match */ 1484 in6_len2mask(&mask, 128); 1485 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1486 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1487 1488 cmp = 1; 1489 } 1490 } 1491 1492 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1493 struct ifaddr *ifa = ifac->ifa; 1494 1495 if (ifa->ifa_addr->sa_family != AF_INET6) 1496 continue; 1497 if (!cmp) 1498 break; 1499 1500 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1501 /* 1502 * XXX: this is adhoc, but is necessary to allow 1503 * a user to specify fe80::/64 (not /10) for a 1504 * link-local address. 1505 */ 1506 if (IN6_IS_ADDR_LINKLOCAL(&candidate)) 1507 candidate.s6_addr16[1] = 0; 1508 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1509 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1510 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1511 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1512 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1513 break; 1514 } 1515 if (ifac == NULL) 1516 return EADDRNOTAVAIL; 1517 ia = ifa2ia6(ifac->ifa); 1518 1519 if (cmd == SIOCGLIFADDR) { 1520 struct sockaddr_in6 *s6; 1521 1522 /* fill in the if_laddrreq structure */ 1523 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1524 s6 = (struct sockaddr_in6 *)&iflr->addr; 1525 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) { 1526 s6->sin6_addr.s6_addr16[1] = 0; 1527 s6->sin6_scope_id = 1528 in6_addr2scopeid(ifp, &s6->sin6_addr); 1529 } 1530 if (ifp->if_flags & IFF_POINTOPOINT) { 1531 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1532 ia->ia_dstaddr.sin6_len); 1533 s6 = (struct sockaddr_in6 *)&iflr->dstaddr; 1534 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) { 1535 s6->sin6_addr.s6_addr16[1] = 0; 1536 s6->sin6_scope_id = 1537 in6_addr2scopeid(ifp, 1538 &s6->sin6_addr); 1539 } 1540 } else 1541 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1542 1543 iflr->prefixlen = 1544 in6_mask2len(&ia->ia_prefixmask.sin6_addr, 1545 NULL); 1546 1547 iflr->flags = ia->ia6_flags; /* XXX */ 1548 1549 return 0; 1550 } else { 1551 struct in6_aliasreq ifra; 1552 1553 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1554 bzero(&ifra, sizeof(ifra)); 1555 bcopy(iflr->iflr_name, ifra.ifra_name, 1556 sizeof(ifra.ifra_name)); 1557 1558 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1559 ia->ia_addr.sin6_len); 1560 if (ifp->if_flags & IFF_POINTOPOINT) 1561 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1562 ia->ia_dstaddr.sin6_len); 1563 else 1564 bzero(&ifra.ifra_dstaddr, 1565 sizeof(ifra.ifra_dstaddr)); 1566 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1567 ia->ia_prefixmask.sin6_len); 1568 1569 ifra.ifra_flags = ia->ia6_flags; 1570 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, 1571 ifp, td); 1572 } 1573 } 1574 } 1575 1576 return EOPNOTSUPP; /* just for safety */ 1577 } 1578 1579 /* 1580 * Initialize an interface's intetnet6 address 1581 * and routing table entry. 1582 */ 1583 static int 1584 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, struct sockaddr_in6 *sin6, 1585 int newhost) 1586 { 1587 int error = 0, plen, ifacount = 0; 1588 struct ifaddr_container *ifac; 1589 1590 /* 1591 * Give the interface a chance to initialize 1592 * if this is its first address, 1593 * and to validate the address if necessary. 1594 */ 1595 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1596 if (ifac->ifa->ifa_addr == NULL) 1597 continue; /* just for safety */ 1598 if (ifac->ifa->ifa_addr->sa_family != AF_INET6) 1599 continue; 1600 ifacount++; 1601 } 1602 1603 ifnet_serialize_all(ifp); 1604 1605 ia->ia_addr = *sin6; 1606 1607 if (ifacount <= 1 && ifp->if_ioctl && 1608 (error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL))) { 1609 ifnet_deserialize_all(ifp); 1610 return (error); 1611 } 1612 1613 ifnet_deserialize_all(ifp); 1614 1615 ia->ia_ifa.ifa_metric = ifp->if_metric; 1616 1617 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1618 1619 /* 1620 * Special case: 1621 * If the destination address is specified for a point-to-point 1622 * interface, install a route to the destination as an interface 1623 * direct route. 1624 */ 1625 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1626 if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) { 1627 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, 1628 RTF_UP | RTF_HOST)) != 0) 1629 return (error); 1630 ia->ia_flags |= IFA_ROUTE; 1631 } 1632 if (plen < 128) { 1633 /* 1634 * The RTF_CLONING flag is necessary for in6_is_ifloop_auto(). 1635 */ 1636 ia->ia_ifa.ifa_flags |= RTF_CLONING; 1637 } 1638 1639 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1640 if (newhost) { 1641 /* set the rtrequest function to create llinfo */ 1642 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1643 in6_ifaddloop(&(ia->ia_ifa)); 1644 } 1645 1646 return (error); 1647 } 1648 1649 struct in6_multi_mship * 1650 in6_joingroup(struct ifnet *ifp, struct in6_addr *addr, int *errorp) 1651 { 1652 struct in6_multi_mship *imm; 1653 1654 imm = kmalloc(sizeof(*imm), M_IPMADDR, M_NOWAIT); 1655 if (!imm) { 1656 *errorp = ENOBUFS; 1657 return NULL; 1658 } 1659 imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp); 1660 if (!imm->i6mm_maddr) { 1661 /* *errorp is alrady set */ 1662 kfree(imm, M_IPMADDR); 1663 return NULL; 1664 } 1665 return imm; 1666 } 1667 1668 int 1669 in6_leavegroup(struct in6_multi_mship *imm) 1670 { 1671 1672 if (imm->i6mm_maddr) 1673 in6_delmulti(imm->i6mm_maddr); 1674 kfree(imm, M_IPMADDR); 1675 return 0; 1676 } 1677 1678 /* 1679 * Add an address to the list of IP6 multicast addresses for a 1680 * given interface. 1681 */ 1682 struct in6_multi * 1683 in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp, int *errorp) 1684 { 1685 struct in6_multi *in6m; 1686 struct sockaddr_in6 sin6; 1687 struct ifmultiaddr *ifma; 1688 1689 *errorp = 0; 1690 1691 crit_enter(); 1692 1693 /* 1694 * Call generic routine to add membership or increment 1695 * refcount. It wants addresses in the form of a sockaddr, 1696 * so we build one here (being careful to zero the unused bytes). 1697 */ 1698 bzero(&sin6, sizeof sin6); 1699 sin6.sin6_family = AF_INET6; 1700 sin6.sin6_len = sizeof sin6; 1701 sin6.sin6_addr = *maddr6; 1702 *errorp = if_addmulti(ifp, (struct sockaddr *)&sin6, &ifma); 1703 if (*errorp) { 1704 crit_exit(); 1705 return 0; 1706 } 1707 1708 /* 1709 * If ifma->ifma_protospec is null, then if_addmulti() created 1710 * a new record. Otherwise, we are done. 1711 */ 1712 if (ifma->ifma_protospec != 0) { 1713 crit_exit(); 1714 return ifma->ifma_protospec; 1715 } 1716 1717 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 1718 at interrupt time? If so, need to fix if_addmulti. XXX */ 1719 in6m = (struct in6_multi *)kmalloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT); 1720 if (in6m == NULL) { 1721 crit_exit(); 1722 return (NULL); 1723 } 1724 1725 bzero(in6m, sizeof *in6m); 1726 in6m->in6m_addr = *maddr6; 1727 in6m->in6m_ifp = ifp; 1728 in6m->in6m_ifma = ifma; 1729 ifma->ifma_protospec = in6m; 1730 LIST_INSERT_HEAD(&in6_multihead, in6m, in6m_entry); 1731 1732 /* 1733 * Let MLD6 know that we have joined a new IP6 multicast 1734 * group. 1735 */ 1736 mld6_start_listening(in6m); 1737 crit_exit(); 1738 return (in6m); 1739 } 1740 1741 /* 1742 * Delete a multicast address record. 1743 */ 1744 void 1745 in6_delmulti(struct in6_multi *in6m) 1746 { 1747 struct ifmultiaddr *ifma = in6m->in6m_ifma; 1748 1749 crit_enter(); 1750 1751 if (ifma->ifma_refcount == 1) { 1752 /* 1753 * No remaining claims to this record; let MLD6 know 1754 * that we are leaving the multicast group. 1755 */ 1756 mld6_stop_listening(in6m); 1757 ifma->ifma_protospec = 0; 1758 LIST_REMOVE(in6m, in6m_entry); 1759 kfree(in6m, M_IPMADDR); 1760 } 1761 /* XXX - should be separate API for when we have an ifma? */ 1762 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1763 crit_exit(); 1764 } 1765 1766 /* 1767 * Find an IPv6 interface link-local address specific to an interface. 1768 */ 1769 struct in6_ifaddr * 1770 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1771 { 1772 struct ifaddr_container *ifac; 1773 1774 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1775 struct ifaddr *ifa = ifac->ifa; 1776 1777 if (ifa->ifa_addr == NULL) 1778 continue; /* just for safety */ 1779 if (ifa->ifa_addr->sa_family != AF_INET6) 1780 continue; 1781 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1782 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1783 ignoreflags) != 0) 1784 continue; 1785 break; 1786 } 1787 } 1788 if (ifac != NULL) 1789 return ((struct in6_ifaddr *)(ifac->ifa)); 1790 else 1791 return (NULL); 1792 } 1793 1794 1795 /* 1796 * find the internet address corresponding to a given interface and address. 1797 */ 1798 struct in6_ifaddr * 1799 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr) 1800 { 1801 struct ifaddr_container *ifac; 1802 1803 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1804 struct ifaddr *ifa = ifac->ifa; 1805 1806 if (ifa->ifa_addr == NULL) 1807 continue; /* just for safety */ 1808 if (ifa->ifa_addr->sa_family != AF_INET6) 1809 continue; 1810 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1811 break; 1812 } 1813 if (ifac != NULL) 1814 return ((struct in6_ifaddr *)(ifac->ifa)); 1815 else 1816 return (NULL); 1817 } 1818 1819 /* 1820 * find the internet address on a given interface corresponding to a neighbor's 1821 * address. 1822 */ 1823 struct in6_ifaddr * 1824 in6ifa_ifplocaladdr(const struct ifnet *ifp, const struct in6_addr *addr) 1825 { 1826 struct ifaddr *ifa; 1827 struct in6_ifaddr *ia; 1828 struct ifaddr_container *ifac; 1829 1830 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1831 ifa = ifac->ifa; 1832 1833 if (ifa->ifa_addr == NULL) 1834 continue; /* just for safety */ 1835 if (ifa->ifa_addr->sa_family != AF_INET6) 1836 continue; 1837 ia = (struct in6_ifaddr *)ifa; 1838 if (IN6_ARE_MASKED_ADDR_EQUAL(addr, 1839 &ia->ia_addr.sin6_addr, 1840 &ia->ia_prefixmask.sin6_addr)) 1841 return ia; 1842 } 1843 1844 return NULL; 1845 } 1846 1847 /* 1848 * Convert IP6 address to printable (loggable) representation. 1849 */ 1850 static char digits[] = "0123456789abcdef"; 1851 static int ip6round = 0; 1852 char * 1853 ip6_sprintf(const struct in6_addr *addr) 1854 { 1855 static char ip6buf[8][48]; 1856 int i; 1857 char *cp; 1858 const u_short *a = (const u_short *)addr; 1859 const u_char *d; 1860 int dcolon = 0; 1861 1862 ip6round = (ip6round + 1) & 7; 1863 cp = ip6buf[ip6round]; 1864 1865 for (i = 0; i < 8; i++) { 1866 if (dcolon == 1) { 1867 if (*a == 0) { 1868 if (i == 7) 1869 *cp++ = ':'; 1870 a++; 1871 continue; 1872 } else 1873 dcolon = 2; 1874 } 1875 if (*a == 0) { 1876 if (dcolon == 0 && *(a + 1) == 0) { 1877 if (i == 0) 1878 *cp++ = ':'; 1879 *cp++ = ':'; 1880 dcolon = 1; 1881 } else { 1882 *cp++ = '0'; 1883 *cp++ = ':'; 1884 } 1885 a++; 1886 continue; 1887 } 1888 d = (const u_char *)a; 1889 *cp++ = digits[*d >> 4]; 1890 *cp++ = digits[*d++ & 0xf]; 1891 *cp++ = digits[*d >> 4]; 1892 *cp++ = digits[*d & 0xf]; 1893 *cp++ = ':'; 1894 a++; 1895 } 1896 *--cp = 0; 1897 return (ip6buf[ip6round]); 1898 } 1899 1900 int 1901 in6_localaddr(struct in6_addr *in6) 1902 { 1903 struct in6_ifaddr *ia; 1904 1905 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1906 return 1; 1907 1908 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 1909 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1910 &ia->ia_prefixmask.sin6_addr)) 1911 return 1; 1912 1913 return (0); 1914 } 1915 1916 int 1917 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1918 { 1919 struct in6_ifaddr *ia; 1920 1921 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1922 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1923 &sa6->sin6_addr) && 1924 (ia->ia6_flags & IN6_IFF_DEPRECATED)) 1925 return (1); /* true */ 1926 1927 /* XXX: do we still have to go thru the rest of the list? */ 1928 } 1929 1930 return (0); /* false */ 1931 } 1932 1933 /* 1934 * return length of part which dst and src are equal 1935 * hard coding... 1936 */ 1937 int 1938 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1939 { 1940 int match = 0; 1941 u_char *s = (u_char *)src, *d = (u_char *)dst; 1942 u_char *lim = s + 16, r; 1943 1944 while (s < lim) 1945 if ((r = (*d++ ^ *s++)) != 0) { 1946 while (r < 128) { 1947 match++; 1948 r <<= 1; 1949 } 1950 break; 1951 } else 1952 match += 8; 1953 return match; 1954 } 1955 1956 /* XXX: to be scope conscious */ 1957 int 1958 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1959 { 1960 int bytelen, bitlen; 1961 1962 /* sanity check */ 1963 if (0 > len || len > 128) { 1964 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1965 len); 1966 return (0); 1967 } 1968 1969 bytelen = len / 8; 1970 bitlen = len % 8; 1971 1972 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1973 return (0); 1974 if (p1->s6_addr[bytelen] >> (8 - bitlen) != 1975 p2->s6_addr[bytelen] >> (8 - bitlen)) 1976 return (0); 1977 1978 return (1); 1979 } 1980 1981 void 1982 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1983 { 1984 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1985 int bytelen, bitlen, i; 1986 1987 /* sanity check */ 1988 if (0 > len || len > 128) { 1989 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1990 len); 1991 return; 1992 } 1993 1994 bzero(maskp, sizeof(*maskp)); 1995 bytelen = len / 8; 1996 bitlen = len % 8; 1997 for (i = 0; i < bytelen; i++) 1998 maskp->s6_addr[i] = 0xff; 1999 if (bitlen) 2000 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 2001 } 2002 2003 /* 2004 * return the best address out of the same scope 2005 */ 2006 struct in6_ifaddr * 2007 in6_ifawithscope(struct ifnet *oifp, struct in6_addr *dst) 2008 { 2009 int dst_scope = in6_addrscope(dst), src_scope, best_scope = 0; 2010 int blen = -1; 2011 struct ifnet *ifp; 2012 struct in6_ifaddr *ifa_best = NULL; 2013 2014 if (oifp == NULL) { 2015 #if 0 2016 kprintf("in6_ifawithscope: output interface is not specified\n"); 2017 #endif 2018 return (NULL); 2019 } 2020 2021 /* 2022 * We search for all addresses on all interfaces from the beginning. 2023 * Comparing an interface with the outgoing interface will be done 2024 * only at the final stage of tiebreaking. 2025 */ 2026 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 2027 { 2028 struct ifaddr_container *ifac; 2029 2030 /* 2031 * We can never take an address that breaks the scope zone 2032 * of the destination. 2033 */ 2034 if (in6_addr2scopeid(ifp, dst) != in6_addr2scopeid(oifp, dst)) 2035 continue; 2036 2037 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2038 int tlen = -1, dscopecmp, bscopecmp, matchcmp; 2039 struct ifaddr *ifa = ifac->ifa; 2040 2041 if (ifa->ifa_addr->sa_family != AF_INET6) 2042 continue; 2043 2044 src_scope = in6_addrscope(IFA_IN6(ifa)); 2045 2046 /* 2047 * Don't use an address before completing DAD 2048 * nor a duplicated address. 2049 */ 2050 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2051 IN6_IFF_NOTREADY) 2052 continue; 2053 2054 /* XXX: is there any case to allow anycasts? */ 2055 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2056 IN6_IFF_ANYCAST) 2057 continue; 2058 2059 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2060 IN6_IFF_DETACHED) 2061 continue; 2062 2063 /* 2064 * If this is the first address we find, 2065 * keep it anyway. 2066 */ 2067 if (ifa_best == NULL) 2068 goto replace; 2069 2070 /* 2071 * ifa_best is never NULL beyond this line except 2072 * within the block labeled "replace". 2073 */ 2074 2075 /* 2076 * If ifa_best has a smaller scope than dst and 2077 * the current address has a larger one than 2078 * (or equal to) dst, always replace ifa_best. 2079 * Also, if the current address has a smaller scope 2080 * than dst, ignore it unless ifa_best also has a 2081 * smaller scope. 2082 * Consequently, after the two if-clause below, 2083 * the followings must be satisfied: 2084 * (scope(src) < scope(dst) && 2085 * scope(best) < scope(dst)) 2086 * OR 2087 * (scope(best) >= scope(dst) && 2088 * scope(src) >= scope(dst)) 2089 */ 2090 if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0 && 2091 IN6_ARE_SCOPE_CMP(src_scope, dst_scope) >= 0) 2092 goto replace; /* (A) */ 2093 if (IN6_ARE_SCOPE_CMP(src_scope, dst_scope) < 0 && 2094 IN6_ARE_SCOPE_CMP(best_scope, dst_scope) >= 0) 2095 continue; /* (B) */ 2096 2097 /* 2098 * A deprecated address SHOULD NOT be used in new 2099 * communications if an alternate (non-deprecated) 2100 * address is available and has sufficient scope. 2101 * RFC 2462, Section 5.5.4. 2102 */ 2103 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2104 IN6_IFF_DEPRECATED) { 2105 /* 2106 * Ignore any deprecated addresses if 2107 * specified by configuration. 2108 */ 2109 if (!ip6_use_deprecated) 2110 continue; 2111 2112 /* 2113 * If we have already found a non-deprecated 2114 * candidate, just ignore deprecated addresses. 2115 */ 2116 if (!(ifa_best->ia6_flags & IN6_IFF_DEPRECATED)) 2117 continue; 2118 } 2119 2120 /* 2121 * A non-deprecated address is always preferred 2122 * to a deprecated one regardless of scopes and 2123 * address matching (Note invariants ensured by the 2124 * conditions (A) and (B) above.) 2125 */ 2126 if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) && 2127 !(((struct in6_ifaddr *)ifa)->ia6_flags & 2128 IN6_IFF_DEPRECATED)) 2129 goto replace; 2130 2131 /* 2132 * When we use temporary addresses described in 2133 * RFC 3041, we prefer temporary addresses to 2134 * public autoconf addresses. Again, note the 2135 * invariants from (A) and (B). Also note that we 2136 * don't have any preference between static addresses 2137 * and autoconf addresses (despite of whether or not 2138 * the latter is temporary or public.) 2139 */ 2140 if (ip6_use_tempaddr) { 2141 struct in6_ifaddr *ifat; 2142 2143 ifat = (struct in6_ifaddr *)ifa; 2144 if ((ifa_best->ia6_flags & 2145 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2146 == IN6_IFF_AUTOCONF && 2147 (ifat->ia6_flags & 2148 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2149 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) { 2150 goto replace; 2151 } 2152 if ((ifa_best->ia6_flags & 2153 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2154 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY) && 2155 (ifat->ia6_flags & 2156 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2157 == IN6_IFF_AUTOCONF) { 2158 continue; 2159 } 2160 } 2161 2162 /* 2163 * At this point, we have two cases: 2164 * 1. we are looking at a non-deprecated address, 2165 * and ifa_best is also non-deprecated. 2166 * 2. we are looking at a deprecated address, 2167 * and ifa_best is also deprecated. 2168 * Also, we do not have to consider a case where 2169 * the scope of if_best is larger(smaller) than dst and 2170 * the scope of the current address is smaller(larger) 2171 * than dst. Such a case has already been covered. 2172 * Tiebreaking is done according to the following 2173 * items: 2174 * - the scope comparison between the address and 2175 * dst (dscopecmp) 2176 * - the scope comparison between the address and 2177 * ifa_best (bscopecmp) 2178 * - if the address match dst longer than ifa_best 2179 * (matchcmp) 2180 * - if the address is on the outgoing I/F (outI/F) 2181 * 2182 * Roughly speaking, the selection policy is 2183 * - the most important item is scope. The same scope 2184 * is best. Then search for a larger scope. 2185 * Smaller scopes are the last resort. 2186 * - A deprecated address is chosen only when we have 2187 * no address that has an enough scope, but is 2188 * prefered to any addresses of smaller scopes 2189 * (this must be already done above.) 2190 * - addresses on the outgoing I/F are preferred to 2191 * ones on other interfaces if none of above 2192 * tiebreaks. In the table below, the column "bI" 2193 * means if the best_ifa is on the outgoing 2194 * interface, and the column "sI" means if the ifa 2195 * is on the outgoing interface. 2196 * - If there is no other reasons to choose one, 2197 * longest address match against dst is considered. 2198 * 2199 * The precise decision table is as follows: 2200 * dscopecmp bscopecmp match bI oI | replace? 2201 * N/A equal N/A Y N | No (1) 2202 * N/A equal N/A N Y | Yes (2) 2203 * N/A equal larger N/A | Yes (3) 2204 * N/A equal !larger N/A | No (4) 2205 * larger larger N/A N/A | No (5) 2206 * larger smaller N/A N/A | Yes (6) 2207 * smaller larger N/A N/A | Yes (7) 2208 * smaller smaller N/A N/A | No (8) 2209 * equal smaller N/A N/A | Yes (9) 2210 * equal larger (already done at A above) 2211 */ 2212 dscopecmp = IN6_ARE_SCOPE_CMP(src_scope, dst_scope); 2213 bscopecmp = IN6_ARE_SCOPE_CMP(src_scope, best_scope); 2214 2215 if (bscopecmp == 0) { 2216 struct ifnet *bifp = ifa_best->ia_ifp; 2217 2218 if (bifp == oifp && ifp != oifp) /* (1) */ 2219 continue; 2220 if (bifp != oifp && ifp == oifp) /* (2) */ 2221 goto replace; 2222 2223 /* 2224 * Both bifp and ifp are on the outgoing 2225 * interface, or both two are on a different 2226 * interface from the outgoing I/F. 2227 * now we need address matching against dst 2228 * for tiebreaking. 2229 */ 2230 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2231 matchcmp = tlen - blen; 2232 if (matchcmp > 0) /* (3) */ 2233 goto replace; 2234 continue; /* (4) */ 2235 } 2236 if (dscopecmp > 0) { 2237 if (bscopecmp > 0) /* (5) */ 2238 continue; 2239 goto replace; /* (6) */ 2240 } 2241 if (dscopecmp < 0) { 2242 if (bscopecmp > 0) /* (7) */ 2243 goto replace; 2244 continue; /* (8) */ 2245 } 2246 2247 /* now dscopecmp must be 0 */ 2248 if (bscopecmp < 0) 2249 goto replace; /* (9) */ 2250 2251 replace: 2252 ifa_best = (struct in6_ifaddr *)ifa; 2253 blen = tlen >= 0 ? tlen : 2254 in6_matchlen(IFA_IN6(ifa), dst); 2255 best_scope = in6_addrscope(&ifa_best->ia_addr.sin6_addr); 2256 } 2257 } 2258 2259 /* count statistics for future improvements */ 2260 if (ifa_best == NULL) 2261 ip6stat.ip6s_sources_none++; 2262 else { 2263 if (oifp == ifa_best->ia_ifp) 2264 ip6stat.ip6s_sources_sameif[best_scope]++; 2265 else 2266 ip6stat.ip6s_sources_otherif[best_scope]++; 2267 2268 if (best_scope == dst_scope) 2269 ip6stat.ip6s_sources_samescope[best_scope]++; 2270 else 2271 ip6stat.ip6s_sources_otherscope[best_scope]++; 2272 2273 if (ifa_best->ia6_flags & IN6_IFF_DEPRECATED) 2274 ip6stat.ip6s_sources_deprecated[best_scope]++; 2275 } 2276 2277 return (ifa_best); 2278 } 2279 2280 /* 2281 * return the best address out of the same scope. if no address was 2282 * found, return the first valid address from designated IF. 2283 */ 2284 struct in6_ifaddr * 2285 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2286 { 2287 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2288 struct ifaddr_container *ifac; 2289 struct in6_ifaddr *besta = 0; 2290 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2291 2292 dep[0] = dep[1] = NULL; 2293 2294 /* 2295 * We first look for addresses in the same scope. 2296 * If there is one, return it. 2297 * If two or more, return one which matches the dst longest. 2298 * If none, return one of global addresses assigned other ifs. 2299 */ 2300 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2301 struct ifaddr *ifa = ifac->ifa; 2302 2303 if (ifa->ifa_addr->sa_family != AF_INET6) 2304 continue; 2305 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2306 continue; /* XXX: is there any case to allow anycast? */ 2307 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2308 continue; /* don't use this interface */ 2309 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2310 continue; 2311 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2312 if (ip6_use_deprecated) 2313 dep[0] = (struct in6_ifaddr *)ifa; 2314 continue; 2315 } 2316 2317 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2318 /* 2319 * call in6_matchlen() as few as possible 2320 */ 2321 if (besta) { 2322 if (blen == -1) 2323 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2324 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2325 if (tlen > blen) { 2326 blen = tlen; 2327 besta = (struct in6_ifaddr *)ifa; 2328 } 2329 } else 2330 besta = (struct in6_ifaddr *)ifa; 2331 } 2332 } 2333 if (besta) 2334 return (besta); 2335 2336 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2337 struct ifaddr *ifa = ifac->ifa; 2338 2339 if (ifa->ifa_addr->sa_family != AF_INET6) 2340 continue; 2341 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2342 continue; /* XXX: is there any case to allow anycast? */ 2343 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2344 continue; /* don't use this interface */ 2345 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2346 continue; 2347 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2348 if (ip6_use_deprecated) 2349 dep[1] = (struct in6_ifaddr *)ifa; 2350 continue; 2351 } 2352 2353 return (struct in6_ifaddr *)ifa; 2354 } 2355 2356 /* use the last-resort values, that are, deprecated addresses */ 2357 if (dep[0]) 2358 return dep[0]; 2359 if (dep[1]) 2360 return dep[1]; 2361 2362 return NULL; 2363 } 2364 2365 /* 2366 * perform DAD when interface becomes IFF_UP. 2367 */ 2368 void 2369 in6_if_up(struct ifnet *ifp) 2370 { 2371 struct ifaddr_container *ifac; 2372 struct in6_ifaddr *ia; 2373 int dad_delay; /* delay ticks before DAD output */ 2374 2375 /* 2376 * special cases, like 6to4, are handled in in6_ifattach 2377 */ 2378 in6_ifattach(ifp, NULL); 2379 2380 dad_delay = 0; 2381 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2382 struct ifaddr *ifa = ifac->ifa; 2383 2384 if (ifa->ifa_addr->sa_family != AF_INET6) 2385 continue; 2386 ia = (struct in6_ifaddr *)ifa; 2387 if (ia->ia6_flags & IN6_IFF_TENTATIVE) 2388 nd6_dad_start(ifa, &dad_delay); 2389 } 2390 } 2391 2392 int 2393 in6if_do_dad(struct ifnet *ifp) 2394 { 2395 if (ifp->if_flags & IFF_LOOPBACK) 2396 return (0); 2397 2398 switch (ifp->if_type) { 2399 #ifdef IFT_DUMMY 2400 case IFT_DUMMY: 2401 #endif 2402 case IFT_FAITH: 2403 /* 2404 * These interfaces do not have the IFF_LOOPBACK flag, 2405 * but loop packets back. We do not have to do DAD on such 2406 * interfaces. We should even omit it, because loop-backed 2407 * NS would confuse the DAD procedure. 2408 */ 2409 return (0); 2410 default: 2411 /* 2412 * Our DAD routine requires the interface up and running. 2413 * However, some interfaces can be up before the RUNNING 2414 * status. Additionaly, users may try to assign addresses 2415 * before the interface becomes up (or running). 2416 * We simply skip DAD in such a case as a work around. 2417 * XXX: we should rather mark "tentative" on such addresses, 2418 * and do DAD after the interface becomes ready. 2419 */ 2420 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != 2421 (IFF_UP|IFF_RUNNING)) 2422 return (0); 2423 2424 return (1); 2425 } 2426 } 2427 2428 /* 2429 * Calculate max IPv6 MTU through all the interfaces and store it 2430 * to in6_maxmtu. 2431 */ 2432 void 2433 in6_setmaxmtu(void) 2434 { 2435 unsigned long maxmtu = 0; 2436 struct ifnet *ifp; 2437 2438 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 2439 { 2440 /* this function can be called during ifnet initialization */ 2441 if (!ifp->if_afdata[AF_INET6]) 2442 continue; 2443 if (!(ifp->if_flags & IFF_LOOPBACK) && 2444 ND_IFINFO(ifp)->linkmtu > maxmtu) 2445 maxmtu = ND_IFINFO(ifp)->linkmtu; 2446 } 2447 if (maxmtu) /* update only when maxmtu is positive */ 2448 in6_maxmtu = maxmtu; 2449 } 2450 2451 void * 2452 in6_domifattach(struct ifnet *ifp) 2453 { 2454 struct in6_ifextra *ext; 2455 2456 ext = (struct in6_ifextra *)kmalloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2457 bzero(ext, sizeof(*ext)); 2458 2459 ext->in6_ifstat = (struct in6_ifstat *)kmalloc(sizeof(struct in6_ifstat), 2460 M_IFADDR, M_WAITOK); 2461 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat)); 2462 2463 ext->icmp6_ifstat = 2464 (struct icmp6_ifstat *)kmalloc(sizeof(struct icmp6_ifstat), 2465 M_IFADDR, M_WAITOK); 2466 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat)); 2467 2468 ext->nd_ifinfo = nd6_ifattach(ifp); 2469 ext->scope6_id = scope6_ifattach(ifp); 2470 return ext; 2471 } 2472 2473 void 2474 in6_domifdetach(struct ifnet *ifp, void *aux) 2475 { 2476 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2477 scope6_ifdetach(ext->scope6_id); 2478 nd6_ifdetach(ext->nd_ifinfo); 2479 kfree(ext->in6_ifstat, M_IFADDR); 2480 kfree(ext->icmp6_ifstat, M_IFADDR); 2481 kfree(ext, M_IFADDR); 2482 } 2483 2484 /* 2485 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2486 * v4 mapped addr or v4 compat addr 2487 */ 2488 void 2489 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2490 { 2491 bzero(sin, sizeof(*sin)); 2492 sin->sin_len = sizeof(struct sockaddr_in); 2493 sin->sin_family = AF_INET; 2494 sin->sin_port = sin6->sin6_port; 2495 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2496 } 2497 2498 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2499 void 2500 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2501 { 2502 bzero(sin6, sizeof(*sin6)); 2503 sin6->sin6_len = sizeof(struct sockaddr_in6); 2504 sin6->sin6_family = AF_INET6; 2505 sin6->sin6_port = sin->sin_port; 2506 sin6->sin6_addr.s6_addr32[0] = 0; 2507 sin6->sin6_addr.s6_addr32[1] = 0; 2508 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2509 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2510 } 2511 2512 /* Convert sockaddr_in6 into sockaddr_in. */ 2513 void 2514 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2515 { 2516 struct sockaddr_in *sin_p; 2517 struct sockaddr_in6 sin6; 2518 2519 /* 2520 * Save original sockaddr_in6 addr and convert it 2521 * to sockaddr_in. 2522 */ 2523 sin6 = *(struct sockaddr_in6 *)nam; 2524 sin_p = (struct sockaddr_in *)nam; 2525 in6_sin6_2_sin(sin_p, &sin6); 2526 } 2527 2528 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2529 void 2530 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2531 { 2532 struct sockaddr_in *sin_p; 2533 struct sockaddr_in6 *sin6_p; 2534 2535 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 2536 M_WAITOK); 2537 sin_p = (struct sockaddr_in *)*nam; 2538 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2539 FREE(*nam, M_SONAME); 2540 *nam = (struct sockaddr *)sin6_p; 2541 } 2542