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/time.h> 81 #include <sys/kernel.h> 82 #include <sys/syslog.h> 83 #include <sys/thread2.h> 84 85 #include <net/if.h> 86 #include <net/if_types.h> 87 #include <net/route.h> 88 #include <net/if_dl.h> 89 90 #include <netinet/in.h> 91 #include <netinet/in_var.h> 92 #include <netinet/if_ether.h> 93 #include <netinet/in_systm.h> 94 #include <netinet/ip.h> 95 #include <netinet/in_pcb.h> 96 97 #include <netinet/ip6.h> 98 #include <netinet6/ip6_var.h> 99 #include <netinet6/nd6.h> 100 #include <netinet6/mld6_var.h> 101 #include <netinet6/ip6_mroute.h> 102 #include <netinet6/in6_ifattach.h> 103 #include <netinet6/scope6_var.h> 104 #include <netinet6/in6_pcb.h> 105 #include <netinet6/in6_var.h> 106 107 #include <net/net_osdep.h> 108 109 /* 110 * Definitions of some costant IP6 addresses. 111 */ 112 const struct in6_addr kin6addr_any = IN6ADDR_ANY_INIT; 113 const struct in6_addr kin6addr_loopback = IN6ADDR_LOOPBACK_INIT; 114 const struct in6_addr kin6addr_nodelocal_allnodes = 115 IN6ADDR_NODELOCAL_ALLNODES_INIT; 116 const struct in6_addr kin6addr_linklocal_allnodes = 117 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 118 const struct in6_addr kin6addr_linklocal_allrouters = 119 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 120 121 const struct in6_addr in6mask0 = IN6MASK0; 122 const struct in6_addr in6mask32 = IN6MASK32; 123 const struct in6_addr in6mask64 = IN6MASK64; 124 const struct in6_addr in6mask96 = IN6MASK96; 125 const struct in6_addr in6mask128 = IN6MASK128; 126 127 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6, 128 0, 0, IN6ADDR_ANY_INIT, 0}; 129 130 static int in6_lifaddr_ioctl (struct socket *, u_long, caddr_t, 131 struct ifnet *, struct thread *); 132 static int in6_ifinit (struct ifnet *, struct in6_ifaddr *, 133 struct sockaddr_in6 *, int); 134 static void in6_unlink_ifa (struct in6_ifaddr *, struct ifnet *); 135 static void in6_ifloop_request_callback(int, int, struct rt_addrinfo *, struct rtentry *, void *); 136 137 struct in6_multihead in6_multihead; /* XXX BSS initialization */ 138 139 int (*faithprefix_p)(struct in6_addr *); 140 141 /* 142 * Subroutine for in6_ifaddloop() and in6_ifremloop(). 143 * This routine does actual work. 144 */ 145 static void 146 in6_ifloop_request(int cmd, struct ifaddr *ifa) 147 { 148 struct sockaddr_in6 all1_sa; 149 struct rt_addrinfo rtinfo; 150 int error; 151 152 bzero(&all1_sa, sizeof(all1_sa)); 153 all1_sa.sin6_family = AF_INET6; 154 all1_sa.sin6_len = sizeof(struct sockaddr_in6); 155 all1_sa.sin6_addr = in6mask128; 156 157 /* 158 * We specify the address itself as the gateway, and set the 159 * RTF_LLINFO flag, so that the corresponding host route would have 160 * the flag, and thus applications that assume traditional behavior 161 * would be happy. Note that we assume the caller of the function 162 * (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest, 163 * which changes the outgoing interface to the loopback interface. 164 */ 165 bzero(&rtinfo, sizeof(struct rt_addrinfo)); 166 rtinfo.rti_info[RTAX_DST] = ifa->ifa_addr; 167 rtinfo.rti_info[RTAX_GATEWAY] = ifa->ifa_addr; 168 rtinfo.rti_info[RTAX_NETMASK] = (struct sockaddr *)&all1_sa; 169 rtinfo.rti_flags = RTF_UP|RTF_HOST|RTF_LLINFO; 170 171 error = rtrequest1_global(cmd, &rtinfo, 172 in6_ifloop_request_callback, ifa); 173 if (error != 0) { 174 log(LOG_ERR, "in6_ifloop_request: " 175 "%s operation failed for %s (errno=%d)\n", 176 cmd == RTM_ADD ? "ADD" : "DELETE", 177 ip6_sprintf(&((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr), 178 error); 179 } 180 } 181 182 static void 183 in6_ifloop_request_callback(int cmd, int error, struct rt_addrinfo *rtinfo, 184 struct rtentry *rt, void *arg) 185 { 186 struct ifaddr *ifa = arg; 187 188 if (error) 189 goto done; 190 191 /* 192 * Make sure rt_ifa be equal to IFA, the second argument of the 193 * function. 194 * We need this because when we refer to rt_ifa->ia6_flags in 195 * ip6_input, we assume that the rt_ifa points to the address instead 196 * of the loopback address. 197 */ 198 if (cmd == RTM_ADD && rt && ifa != rt->rt_ifa) { 199 ++rt->rt_refcnt; 200 IFAFREE(rt->rt_ifa); 201 IFAREF(ifa); 202 rt->rt_ifa = ifa; 203 --rt->rt_refcnt; 204 } 205 206 /* 207 * Report the addition/removal of the address to the routing socket. 208 * XXX: since we called rtinit for a p2p interface with a destination, 209 * we end up reporting twice in such a case. Should we rather 210 * omit the second report? 211 */ 212 if (rt) { 213 if (mycpuid == 0) 214 rt_newaddrmsg(cmd, ifa, error, rt); 215 if (cmd == RTM_DELETE) { 216 if (rt->rt_refcnt == 0) { 217 ++rt->rt_refcnt; 218 rtfree(rt); 219 } 220 } 221 } 222 done: 223 /* no way to return any new error */ 224 ; 225 } 226 227 /* 228 * Add ownaddr as loopback rtentry. We previously add the route only if 229 * necessary (ex. on a p2p link). However, since we now manage addresses 230 * separately from prefixes, we should always add the route. We can't 231 * rely on the cloning mechanism from the corresponding interface route 232 * any more. 233 */ 234 void 235 in6_ifaddloop(struct ifaddr *ifa) 236 { 237 struct rtentry *rt; 238 239 /* If there is no loopback entry, allocate one. */ 240 rt = rtpurelookup(ifa->ifa_addr); 241 if (rt == NULL || !(rt->rt_flags & RTF_HOST) || 242 !(rt->rt_ifp->if_flags & IFF_LOOPBACK)) 243 in6_ifloop_request(RTM_ADD, ifa); 244 if (rt != NULL) 245 rt->rt_refcnt--; 246 } 247 248 /* 249 * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(), 250 * if it exists. 251 */ 252 void 253 in6_ifremloop(struct ifaddr *ifa) 254 { 255 struct in6_ifaddr *ia; 256 struct rtentry *rt; 257 int ia_count = 0; 258 259 /* 260 * Some of BSD variants do not remove cloned routes 261 * from an interface direct route, when removing the direct route 262 * (see comments in net/net_osdep.h). Even for variants that do remove 263 * cloned routes, they could fail to remove the cloned routes when 264 * we handle multple addresses that share a common prefix. 265 * So, we should remove the route corresponding to the deleted address 266 * regardless of the result of in6_is_ifloop_auto(). 267 */ 268 269 /* 270 * Delete the entry only if exact one ifa exists. More than one ifa 271 * can exist if we assign a same single address to multiple 272 * (probably p2p) interfaces. 273 * XXX: we should avoid such a configuration in IPv6... 274 */ 275 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 276 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) { 277 ia_count++; 278 if (ia_count > 1) 279 break; 280 } 281 } 282 283 if (ia_count == 1) { 284 /* 285 * Before deleting, check if a corresponding loopbacked host 286 * route surely exists. With this check, we can avoid to 287 * delete an interface direct route whose destination is same 288 * as the address being removed. This can happen when remofing 289 * a subnet-router anycast address on an interface attahced 290 * to a shared medium. 291 */ 292 rt = rtpurelookup(ifa->ifa_addr); 293 if (rt != NULL && (rt->rt_flags & RTF_HOST) && 294 (rt->rt_ifp->if_flags & IFF_LOOPBACK)) { 295 rt->rt_refcnt--; 296 in6_ifloop_request(RTM_DELETE, ifa); 297 } 298 } 299 } 300 301 int 302 in6_ifindex2scopeid(int idx) 303 { 304 struct ifnet *ifp; 305 struct sockaddr_in6 *sin6; 306 struct ifaddr_container *ifac; 307 308 if (idx < 0 || if_index < idx) 309 return -1; 310 ifp = ifindex2ifnet[idx]; 311 312 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) 313 { 314 struct ifaddr *ifa = ifac->ifa; 315 316 if (ifa->ifa_addr->sa_family != AF_INET6) 317 continue; 318 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 319 if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) 320 return sin6->sin6_scope_id & 0xffff; 321 } 322 323 return -1; 324 } 325 326 int 327 in6_mask2len(struct in6_addr *mask, u_char *lim0) 328 { 329 int x = 0, y; 330 u_char *lim = lim0, *p; 331 332 if (lim0 == NULL || 333 lim0 - (u_char *)mask > sizeof(*mask)) /* ignore the scope_id part */ 334 lim = (u_char *)mask + sizeof(*mask); 335 for (p = (u_char *)mask; p < lim; x++, p++) { 336 if (*p != 0xff) 337 break; 338 } 339 y = 0; 340 if (p < lim) { 341 for (y = 0; y < 8; y++) { 342 if ((*p & (0x80 >> y)) == 0) 343 break; 344 } 345 } 346 347 /* 348 * when the limit pointer is given, do a stricter check on the 349 * remaining bits. 350 */ 351 if (p < lim) { 352 if (y != 0 && (*p & (0x00ff >> y)) != 0) 353 return (-1); 354 for (p = p + 1; p < lim; p++) 355 if (*p != 0) 356 return (-1); 357 } 358 359 return x * 8 + y; 360 } 361 362 void 363 in6_len2mask(struct in6_addr *mask, int len) 364 { 365 int i; 366 367 bzero(mask, sizeof(*mask)); 368 for (i = 0; i < len / 8; i++) 369 mask->s6_addr8[i] = 0xff; 370 if (len % 8) 371 mask->s6_addr8[i] = (0xff00 >> (len % 8)) & 0xff; 372 } 373 374 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 375 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 376 377 int 378 in6_control(struct socket *so, u_long cmd, caddr_t data, 379 struct ifnet *ifp, struct thread *td) 380 { 381 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 382 struct in6_ifaddr *ia = NULL; 383 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 384 int privileged; 385 int error; 386 387 privileged = 0; 388 if (suser(td) == 0) 389 privileged++; 390 391 switch (cmd) { 392 case SIOCGETSGCNT_IN6: 393 case SIOCGETMIFCNT_IN6: 394 return (mrt6_ioctl(cmd, data)); 395 } 396 397 if (ifp == NULL) 398 return (EOPNOTSUPP); 399 400 switch (cmd) { 401 case SIOCSNDFLUSH_IN6: 402 case SIOCSPFXFLUSH_IN6: 403 case SIOCSRTRFLUSH_IN6: 404 case SIOCSDEFIFACE_IN6: 405 case SIOCSIFINFO_FLAGS: 406 if (!privileged) 407 return (EPERM); 408 /* fall through */ 409 case OSIOCGIFINFO_IN6: 410 case SIOCGIFINFO_IN6: 411 case SIOCGDRLST_IN6: 412 case SIOCGPRLST_IN6: 413 case SIOCGNBRINFO_IN6: 414 case SIOCGDEFIFACE_IN6: 415 return (nd6_ioctl(cmd, data, ifp)); 416 } 417 418 switch (cmd) { 419 case SIOCSIFPREFIX_IN6: 420 case SIOCDIFPREFIX_IN6: 421 case SIOCAIFPREFIX_IN6: 422 case SIOCCIFPREFIX_IN6: 423 case SIOCSGIFPREFIX_IN6: 424 case SIOCGIFPREFIX_IN6: 425 log(LOG_NOTICE, 426 "prefix ioctls are now invalidated. " 427 "please use ifconfig.\n"); 428 return (EOPNOTSUPP); 429 } 430 431 switch (cmd) { 432 case SIOCSSCOPE6: 433 if (!privileged) 434 return (EPERM); 435 return (scope6_set(ifp, 436 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 437 break; 438 case SIOCGSCOPE6: 439 return (scope6_get(ifp, 440 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 441 break; 442 case SIOCGSCOPE6DEF: 443 return (scope6_get_default((struct scope6_id *) 444 ifr->ifr_ifru.ifru_scope_id)); 445 break; 446 } 447 448 switch (cmd) { 449 case SIOCALIFADDR: 450 case SIOCDLIFADDR: 451 if (!privileged) 452 return (EPERM); 453 /* fall through */ 454 case SIOCGLIFADDR: 455 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 456 } 457 458 /* 459 * Find address for this interface, if it exists. 460 */ 461 if (ifra->ifra_addr.sin6_family == AF_INET6) { /* XXX */ 462 struct sockaddr_in6 *sa6 = 463 (struct sockaddr_in6 *)&ifra->ifra_addr; 464 465 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) { 466 if (sa6->sin6_addr.s6_addr16[1] == 0) { 467 /* link ID is not embedded by the user */ 468 sa6->sin6_addr.s6_addr16[1] = 469 htons(ifp->if_index); 470 } else if (sa6->sin6_addr.s6_addr16[1] != 471 htons(ifp->if_index)) { 472 return (EINVAL); /* link ID contradicts */ 473 } 474 if (sa6->sin6_scope_id) { 475 if (sa6->sin6_scope_id != 476 (u_int32_t)ifp->if_index) 477 return (EINVAL); 478 sa6->sin6_scope_id = 0; /* XXX: good way? */ 479 } 480 } 481 ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr); 482 } 483 484 switch (cmd) { 485 case SIOCSIFADDR_IN6: 486 case SIOCSIFDSTADDR_IN6: 487 case SIOCSIFNETMASK_IN6: 488 /* 489 * Since IPv6 allows a node to assign multiple addresses 490 * on a single interface, SIOCSIFxxx ioctls are not suitable 491 * and should be unused. 492 */ 493 /* we decided to obsolete this command (20000704) */ 494 return (EINVAL); 495 496 case SIOCDIFADDR_IN6: 497 /* 498 * for IPv4, we look for existing in_ifaddr here to allow 499 * "ifconfig if0 delete" to remove first IPv4 address on the 500 * interface. For IPv6, as the spec allow multiple interface 501 * address from the day one, we consider "remove the first one" 502 * semantics to be not preferable. 503 */ 504 if (ia == NULL) 505 return (EADDRNOTAVAIL); 506 /* FALLTHROUGH */ 507 case SIOCAIFADDR_IN6: 508 /* 509 * We always require users to specify a valid IPv6 address for 510 * the corresponding operation. 511 */ 512 if (ifra->ifra_addr.sin6_family != AF_INET6 || 513 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) 514 return (EAFNOSUPPORT); 515 if (!privileged) 516 return (EPERM); 517 518 break; 519 520 case SIOCGIFADDR_IN6: 521 /* This interface is basically deprecated. use SIOCGIFCONF. */ 522 /* fall through */ 523 case SIOCGIFAFLAG_IN6: 524 case SIOCGIFNETMASK_IN6: 525 case SIOCGIFDSTADDR_IN6: 526 case SIOCGIFALIFETIME_IN6: 527 /* must think again about its semantics */ 528 if (ia == NULL) 529 return (EADDRNOTAVAIL); 530 break; 531 case SIOCSIFALIFETIME_IN6: 532 { 533 struct in6_addrlifetime *lt; 534 535 if (!privileged) 536 return (EPERM); 537 if (ia == NULL) 538 return (EADDRNOTAVAIL); 539 /* sanity for overflow - beware unsigned */ 540 lt = &ifr->ifr_ifru.ifru_lifetime; 541 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME 542 && lt->ia6t_vltime + time_second < time_second) { 543 return EINVAL; 544 } 545 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME 546 && lt->ia6t_pltime + time_second < time_second) { 547 return EINVAL; 548 } 549 break; 550 } 551 } 552 553 switch (cmd) { 554 555 case SIOCGIFADDR_IN6: 556 ifr->ifr_addr = ia->ia_addr; 557 break; 558 559 case SIOCGIFDSTADDR_IN6: 560 if (!(ifp->if_flags & IFF_POINTOPOINT)) 561 return (EINVAL); 562 /* 563 * XXX: should we check if ifa_dstaddr is NULL and return 564 * an error? 565 */ 566 ifr->ifr_dstaddr = ia->ia_dstaddr; 567 break; 568 569 case SIOCGIFNETMASK_IN6: 570 ifr->ifr_addr = ia->ia_prefixmask; 571 break; 572 573 case SIOCGIFAFLAG_IN6: 574 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 575 break; 576 577 case SIOCGIFSTAT_IN6: 578 if (ifp == NULL) 579 return EINVAL; 580 bzero(&ifr->ifr_ifru.ifru_stat, 581 sizeof(ifr->ifr_ifru.ifru_stat)); 582 ifr->ifr_ifru.ifru_stat = 583 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat; 584 break; 585 586 case SIOCGIFSTAT_ICMP6: 587 bzero(&ifr->ifr_ifru.ifru_stat, 588 sizeof(ifr->ifr_ifru.ifru_icmp6stat)); 589 ifr->ifr_ifru.ifru_icmp6stat = 590 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat; 591 break; 592 593 case SIOCGIFALIFETIME_IN6: 594 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 595 break; 596 597 case SIOCSIFALIFETIME_IN6: 598 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; 599 /* for sanity */ 600 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 601 ia->ia6_lifetime.ia6t_expire = 602 time_second + ia->ia6_lifetime.ia6t_vltime; 603 } else 604 ia->ia6_lifetime.ia6t_expire = 0; 605 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 606 ia->ia6_lifetime.ia6t_preferred = 607 time_second + ia->ia6_lifetime.ia6t_pltime; 608 } else 609 ia->ia6_lifetime.ia6t_preferred = 0; 610 break; 611 612 case SIOCAIFADDR_IN6: 613 { 614 int i, error = 0, iaIsNew; 615 struct nd_prefix pr0, *pr; 616 617 if (ia != NULL) 618 iaIsNew = 0; 619 else 620 iaIsNew = 1; 621 622 /* 623 * first, make or update the interface address structure, 624 * and link it to the list. 625 */ 626 if ((error = in6_update_ifa(ifp, ifra, ia)) != 0) 627 return (error); 628 629 /* 630 * then, make the prefix on-link on the interface. 631 * XXX: we'd rather create the prefix before the address, but 632 * we need at least one address to install the corresponding 633 * interface route, so we configure the address first. 634 */ 635 636 /* 637 * convert mask to prefix length (prefixmask has already 638 * been validated in in6_update_ifa(). 639 */ 640 bzero(&pr0, sizeof(pr0)); 641 pr0.ndpr_ifp = ifp; 642 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 643 NULL); 644 if (pr0.ndpr_plen == 128) 645 break; /* we don't need to install a host route. */ 646 pr0.ndpr_prefix = ifra->ifra_addr; 647 pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr; 648 /* apply the mask for safety. */ 649 for (i = 0; i < 4; i++) { 650 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 651 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i]; 652 } 653 /* 654 * XXX: since we don't have an API to set prefix (not address) 655 * lifetimes, we just use the same lifetimes as addresses. 656 * The (temporarily) installed lifetimes can be overridden by 657 * later advertised RAs (when accept_rtadv is non 0), which is 658 * an intended behavior. 659 */ 660 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 661 pr0.ndpr_raf_auto = 662 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 663 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 664 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 665 666 /* add the prefix if there's one. */ 667 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 668 /* 669 * nd6_prelist_add will install the corresponding 670 * interface route. 671 */ 672 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) 673 return (error); 674 if (pr == NULL) { 675 log(LOG_ERR, "nd6_prelist_add succeeded but " 676 "no prefix\n"); 677 return (EINVAL); /* XXX panic here? */ 678 } 679 } 680 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 681 == NULL) { 682 /* XXX: this should not happen! */ 683 log(LOG_ERR, "in6_control: addition succeeded, but" 684 " no ifaddr\n"); 685 } else { 686 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 687 ia->ia6_ndpr == NULL) { /* new autoconfed addr */ 688 ia->ia6_ndpr = pr; 689 pr->ndpr_refcnt++; 690 691 /* 692 * If this is the first autoconf address from 693 * the prefix, create a temporary address 694 * as well (when specified). 695 */ 696 if (ip6_use_tempaddr && 697 pr->ndpr_refcnt == 1) { 698 int e; 699 if ((e = in6_tmpifadd(ia, 1)) != 0) { 700 log(LOG_NOTICE, "in6_control: " 701 "failed to create a " 702 "temporary address, " 703 "errno=%d\n", 704 e); 705 } 706 } 707 } 708 709 /* 710 * this might affect the status of autoconfigured 711 * addresses, that is, this address might make 712 * other addresses detached. 713 */ 714 pfxlist_onlink_check(); 715 } 716 if (error == 0 && ia) { 717 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 718 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 719 &ia->ia_ifa); 720 } 721 break; 722 } 723 724 case SIOCDIFADDR_IN6: 725 { 726 int i = 0; 727 struct nd_prefix pr0, *pr; 728 729 /* 730 * If the address being deleted is the only one that owns 731 * the corresponding prefix, expire the prefix as well. 732 * XXX: theoretically, we don't have to warry about such 733 * relationship, since we separate the address management 734 * and the prefix management. We do this, however, to provide 735 * as much backward compatibility as possible in terms of 736 * the ioctl operation. 737 */ 738 bzero(&pr0, sizeof(pr0)); 739 pr0.ndpr_ifp = ifp; 740 pr0.ndpr_plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, 741 NULL); 742 if (pr0.ndpr_plen == 128) 743 goto purgeaddr; 744 pr0.ndpr_prefix = ia->ia_addr; 745 pr0.ndpr_mask = ia->ia_prefixmask.sin6_addr; 746 for (i = 0; i < 4; i++) { 747 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 748 ia->ia_prefixmask.sin6_addr.s6_addr32[i]; 749 } 750 /* 751 * The logic of the following condition is a bit complicated. 752 * We expire the prefix when 753 * 1. the address obeys autoconfiguration and it is the 754 * only owner of the associated prefix, or 755 * 2. the address does not obey autoconf and there is no 756 * other owner of the prefix. 757 */ 758 if ((pr = nd6_prefix_lookup(&pr0)) != NULL && 759 (((ia->ia6_flags & IN6_IFF_AUTOCONF) && 760 pr->ndpr_refcnt == 1) || 761 (!(ia->ia6_flags & IN6_IFF_AUTOCONF) && 762 pr->ndpr_refcnt == 0))) { 763 pr->ndpr_expire = 1; /* XXX: just for expiration */ 764 } 765 766 purgeaddr: 767 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE, 768 &ia->ia_ifa); 769 in6_purgeaddr(&ia->ia_ifa); 770 break; 771 } 772 773 default: 774 if (ifp == NULL || ifp->if_ioctl == 0) 775 return (EOPNOTSUPP); 776 lwkt_serialize_enter(ifp->if_serializer); 777 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred); 778 lwkt_serialize_exit(ifp->if_serializer); 779 return (error); 780 } 781 782 return (0); 783 } 784 785 /* 786 * Update parameters of an IPv6 interface address. 787 * If necessary, a new entry is created and linked into address chains. 788 * This function is separated from in6_control(). 789 * XXX: should this be performed under splnet()? 790 */ 791 int 792 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 793 struct in6_ifaddr *ia) 794 { 795 int error = 0, hostIsNew = 0, plen = -1; 796 struct in6_ifaddr *oia; 797 struct sockaddr_in6 dst6; 798 struct in6_addrlifetime *lt; 799 800 /* Validate parameters */ 801 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 802 return (EINVAL); 803 804 /* 805 * The destination address for a p2p link must have a family 806 * of AF_UNSPEC or AF_INET6. 807 */ 808 if ((ifp->if_flags & IFF_POINTOPOINT) && 809 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 810 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 811 return (EAFNOSUPPORT); 812 /* 813 * validate ifra_prefixmask. don't check sin6_family, netmask 814 * does not carry fields other than sin6_len. 815 */ 816 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 817 return (EINVAL); 818 /* 819 * Because the IPv6 address architecture is classless, we require 820 * users to specify a (non 0) prefix length (mask) for a new address. 821 * We also require the prefix (when specified) mask is valid, and thus 822 * reject a non-consecutive mask. 823 */ 824 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 825 return (EINVAL); 826 if (ifra->ifra_prefixmask.sin6_len != 0) { 827 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 828 (u_char *)&ifra->ifra_prefixmask + 829 ifra->ifra_prefixmask.sin6_len); 830 if (plen <= 0) 831 return (EINVAL); 832 } 833 else { 834 /* 835 * In this case, ia must not be NULL. We just use its prefix 836 * length. 837 */ 838 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 839 } 840 /* 841 * If the destination address on a p2p interface is specified, 842 * and the address is a scoped one, validate/set the scope 843 * zone identifier. 844 */ 845 dst6 = ifra->ifra_dstaddr; 846 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) && 847 (dst6.sin6_family == AF_INET6)) { 848 int scopeid; 849 850 if ((error = in6_recoverscope(&dst6, 851 &ifra->ifra_dstaddr.sin6_addr, 852 ifp)) != 0) 853 return (error); 854 scopeid = in6_addr2scopeid(ifp, &dst6.sin6_addr); 855 if (dst6.sin6_scope_id == 0) /* user omit to specify the ID. */ 856 dst6.sin6_scope_id = scopeid; 857 else if (dst6.sin6_scope_id != scopeid) 858 return (EINVAL); /* scope ID mismatch. */ 859 if ((error = in6_embedscope(&dst6.sin6_addr, &dst6, NULL, NULL)) 860 != 0) 861 return (error); 862 dst6.sin6_scope_id = 0; /* XXX */ 863 } 864 /* 865 * The destination address can be specified only for a p2p or a 866 * loopback interface. If specified, the corresponding prefix length 867 * must be 128. 868 */ 869 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 870 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0) { 871 /* XXX: noisy message */ 872 log(LOG_INFO, "in6_update_ifa: a destination can be " 873 "specified for a p2p or a loopback IF only\n"); 874 return (EINVAL); 875 } 876 if (plen != 128) { 877 /* 878 * The following message seems noisy, but we dare to 879 * add it for diagnosis. 880 */ 881 log(LOG_INFO, "in6_update_ifa: prefixlen must be 128 " 882 "when dstaddr is specified\n"); 883 return (EINVAL); 884 } 885 } 886 /* lifetime consistency check */ 887 lt = &ifra->ifra_lifetime; 888 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME 889 && lt->ia6t_vltime + time_second < time_second) { 890 return EINVAL; 891 } 892 if (lt->ia6t_vltime == 0) { 893 /* 894 * the following log might be noisy, but this is a typical 895 * configuration mistake or a tool's bug. 896 */ 897 log(LOG_INFO, 898 "in6_update_ifa: valid lifetime is 0 for %s\n", 899 ip6_sprintf(&ifra->ifra_addr.sin6_addr)); 900 } 901 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME 902 && lt->ia6t_pltime + time_second < time_second) { 903 return EINVAL; 904 } 905 906 /* 907 * If this is a new address, allocate a new ifaddr and link it 908 * into chains. 909 */ 910 if (ia == NULL) { 911 hostIsNew = 1; 912 /* 913 * When in6_update_ifa() is called in a process of a received 914 * RA, it is called under splnet(). So, we should call malloc 915 * with M_NOWAIT. 916 */ 917 ia = ifa_create(sizeof(*ia), M_NOWAIT); 918 if (ia == NULL) 919 return (ENOBUFS); 920 /* Initialize the address and masks */ 921 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 922 ia->ia_addr.sin6_family = AF_INET6; 923 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 924 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 925 /* 926 * XXX: some functions expect that ifa_dstaddr is not 927 * NULL for p2p interfaces. 928 */ 929 ia->ia_ifa.ifa_dstaddr 930 = (struct sockaddr *)&ia->ia_dstaddr; 931 } else { 932 ia->ia_ifa.ifa_dstaddr = NULL; 933 } 934 ia->ia_ifa.ifa_netmask 935 = (struct sockaddr *)&ia->ia_prefixmask; 936 937 ia->ia_ifp = ifp; 938 if ((oia = in6_ifaddr) != NULL) { 939 for ( ; oia->ia_next; oia = oia->ia_next) 940 continue; 941 oia->ia_next = ia; 942 } else 943 in6_ifaddr = ia; 944 945 ifa_iflink(&ia->ia_ifa, ifp, 1); 946 } 947 948 /* set prefix mask */ 949 if (ifra->ifra_prefixmask.sin6_len) { 950 /* 951 * We prohibit changing the prefix length of an existing 952 * address, because 953 * + such an operation should be rare in IPv6, and 954 * + the operation would confuse prefix management. 955 */ 956 if (ia->ia_prefixmask.sin6_len && 957 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 958 log(LOG_INFO, "in6_update_ifa: the prefix length of an" 959 " existing (%s) address should not be changed\n", 960 ip6_sprintf(&ia->ia_addr.sin6_addr)); 961 error = EINVAL; 962 goto unlink; 963 } 964 ia->ia_prefixmask = ifra->ifra_prefixmask; 965 } 966 967 /* 968 * If a new destination address is specified, scrub the old one and 969 * install the new destination. Note that the interface must be 970 * p2p or loopback (see the check above.) 971 */ 972 if (dst6.sin6_family == AF_INET6 && 973 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, 974 &ia->ia_dstaddr.sin6_addr)) { 975 int e; 976 977 if ((ia->ia_flags & IFA_ROUTE) && 978 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 979 != 0) { 980 log(LOG_ERR, "in6_update_ifa: failed to remove " 981 "a route to the old destination: %s\n", 982 ip6_sprintf(&ia->ia_addr.sin6_addr)); 983 /* proceed anyway... */ 984 } 985 else 986 ia->ia_flags &= ~IFA_ROUTE; 987 ia->ia_dstaddr = dst6; 988 } 989 990 /* reset the interface and routing table appropriately. */ 991 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 992 goto unlink; 993 994 /* 995 * Beyond this point, we should call in6_purgeaddr upon an error, 996 * not just go to unlink. 997 */ 998 999 #if 0 /* disable this mechanism for now */ 1000 /* update prefix list */ 1001 if (hostIsNew && 1002 (ifra->ifra_flags & IN6_IFF_NOPFX) == 0) { /* XXX */ 1003 int iilen; 1004 1005 iilen = (sizeof(ia->ia_prefixmask.sin6_addr) << 3) - plen; 1006 if ((error = in6_prefix_add_ifid(iilen, ia)) != 0) { 1007 in6_purgeaddr((struct ifaddr *)ia); 1008 return (error); 1009 } 1010 } 1011 #endif 1012 1013 if (ifp->if_flags & IFF_MULTICAST) { 1014 struct sockaddr_in6 mltaddr, mltmask; 1015 struct in6_multi *in6m; 1016 1017 if (hostIsNew) { 1018 /* 1019 * join solicited multicast addr for new host id 1020 */ 1021 struct in6_addr llsol; 1022 bzero(&llsol, sizeof(struct in6_addr)); 1023 llsol.s6_addr16[0] = htons(0xff02); 1024 llsol.s6_addr16[1] = htons(ifp->if_index); 1025 llsol.s6_addr32[1] = 0; 1026 llsol.s6_addr32[2] = htonl(1); 1027 llsol.s6_addr32[3] = 1028 ifra->ifra_addr.sin6_addr.s6_addr32[3]; 1029 llsol.s6_addr8[12] = 0xff; 1030 in6_addmulti(&llsol, ifp, &error); 1031 if (error != 0) { 1032 log(LOG_WARNING, 1033 "in6_update_ifa: addmulti failed for " 1034 "%s on %s (errno=%d)\n", 1035 ip6_sprintf(&llsol), if_name(ifp), 1036 error); 1037 in6_purgeaddr((struct ifaddr *)ia); 1038 return (error); 1039 } 1040 } 1041 1042 bzero(&mltmask, sizeof(mltmask)); 1043 mltmask.sin6_len = sizeof(struct sockaddr_in6); 1044 mltmask.sin6_family = AF_INET6; 1045 mltmask.sin6_addr = in6mask32; 1046 1047 /* 1048 * join link-local all-nodes address 1049 */ 1050 bzero(&mltaddr, sizeof(mltaddr)); 1051 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 1052 mltaddr.sin6_family = AF_INET6; 1053 mltaddr.sin6_addr = kin6addr_linklocal_allnodes; 1054 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1055 1056 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1057 if (in6m == NULL) { 1058 rtrequest_global(RTM_ADD, 1059 (struct sockaddr *)&mltaddr, 1060 (struct sockaddr *)&ia->ia_addr, 1061 (struct sockaddr *)&mltmask, 1062 RTF_UP|RTF_CLONING); /* xxx */ 1063 in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 1064 if (error != 0) { 1065 log(LOG_WARNING, 1066 "in6_update_ifa: addmulti failed for " 1067 "%s on %s (errno=%d)\n", 1068 ip6_sprintf(&mltaddr.sin6_addr), 1069 if_name(ifp), error); 1070 } 1071 } 1072 1073 /* 1074 * join node information group address 1075 */ 1076 #define hostnamelen strlen(hostname) 1077 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr.sin6_addr) 1078 == 0) { 1079 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1080 if (in6m == NULL && ia != NULL) { 1081 in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 1082 if (error != 0) { 1083 log(LOG_WARNING, "in6_update_ifa: " 1084 "addmulti failed for " 1085 "%s on %s (errno=%d)\n", 1086 ip6_sprintf(&mltaddr.sin6_addr), 1087 if_name(ifp), error); 1088 } 1089 } 1090 } 1091 #undef hostnamelen 1092 1093 /* 1094 * join node-local all-nodes address, on loopback. 1095 * XXX: since "node-local" is obsoleted by interface-local, 1096 * we have to join the group on every interface with 1097 * some interface-boundary restriction. 1098 */ 1099 if (ifp->if_flags & IFF_LOOPBACK) { 1100 struct in6_ifaddr *ia_loop; 1101 1102 struct in6_addr loop6 = kin6addr_loopback; 1103 ia_loop = in6ifa_ifpwithaddr(ifp, &loop6); 1104 1105 mltaddr.sin6_addr = kin6addr_nodelocal_allnodes; 1106 1107 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1108 if (in6m == NULL && ia_loop != NULL) { 1109 rtrequest_global(RTM_ADD, 1110 (struct sockaddr *)&mltaddr, 1111 (struct sockaddr *)&ia_loop->ia_addr, 1112 (struct sockaddr *)&mltmask, 1113 RTF_UP); 1114 in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 1115 if (error != 0) { 1116 log(LOG_WARNING, "in6_update_ifa: " 1117 "addmulti failed for %s on %s " 1118 "(errno=%d)\n", 1119 ip6_sprintf(&mltaddr.sin6_addr), 1120 if_name(ifp), error); 1121 } 1122 } 1123 } 1124 } 1125 1126 ia->ia6_flags = ifra->ifra_flags; 1127 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /*safety*/ 1128 ia->ia6_flags &= ~IN6_IFF_NODAD; /* Mobile IPv6 */ 1129 1130 ia->ia6_lifetime = ifra->ifra_lifetime; 1131 /* for sanity */ 1132 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1133 ia->ia6_lifetime.ia6t_expire = 1134 time_second + ia->ia6_lifetime.ia6t_vltime; 1135 } else 1136 ia->ia6_lifetime.ia6t_expire = 0; 1137 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1138 ia->ia6_lifetime.ia6t_preferred = 1139 time_second + ia->ia6_lifetime.ia6t_pltime; 1140 } else 1141 ia->ia6_lifetime.ia6t_preferred = 0; 1142 1143 /* 1144 * Perform DAD, if needed. 1145 * XXX It may be of use, if we can administratively 1146 * disable DAD. 1147 */ 1148 if (in6if_do_dad(ifp) && !(ifra->ifra_flags & IN6_IFF_NODAD)) { 1149 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1150 nd6_dad_start((struct ifaddr *)ia, NULL); 1151 } 1152 1153 return (error); 1154 1155 unlink: 1156 /* 1157 * XXX: if a change of an existing address failed, keep the entry 1158 * anyway. 1159 */ 1160 if (hostIsNew) 1161 in6_unlink_ifa(ia, ifp); 1162 return (error); 1163 } 1164 1165 void 1166 in6_purgeaddr(struct ifaddr *ifa) 1167 { 1168 struct ifnet *ifp = ifa->ifa_ifp; 1169 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1170 1171 /* stop DAD processing */ 1172 nd6_dad_stop(ifa); 1173 1174 /* 1175 * delete route to the destination of the address being purged. 1176 * The interface must be p2p or loopback in this case. 1177 */ 1178 if ((ia->ia_flags & IFA_ROUTE) && ia->ia_dstaddr.sin6_len != 0) { 1179 int e; 1180 1181 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 1182 != 0) { 1183 log(LOG_ERR, "in6_purgeaddr: failed to remove " 1184 "a route to the p2p destination: %s on %s, " 1185 "errno=%d\n", 1186 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp), 1187 e); 1188 /* proceed anyway... */ 1189 } 1190 else 1191 ia->ia_flags &= ~IFA_ROUTE; 1192 } 1193 1194 /* Remove ownaddr's loopback rtentry, if it exists. */ 1195 in6_ifremloop(&(ia->ia_ifa)); 1196 1197 if (ifp->if_flags & IFF_MULTICAST) { 1198 /* 1199 * delete solicited multicast addr for deleting host id 1200 */ 1201 struct in6_multi *in6m; 1202 struct in6_addr llsol; 1203 bzero(&llsol, sizeof(struct in6_addr)); 1204 llsol.s6_addr16[0] = htons(0xff02); 1205 llsol.s6_addr16[1] = htons(ifp->if_index); 1206 llsol.s6_addr32[1] = 0; 1207 llsol.s6_addr32[2] = htonl(1); 1208 llsol.s6_addr32[3] = 1209 ia->ia_addr.sin6_addr.s6_addr32[3]; 1210 llsol.s6_addr8[12] = 0xff; 1211 1212 IN6_LOOKUP_MULTI(llsol, ifp, in6m); 1213 if (in6m) 1214 in6_delmulti(in6m); 1215 } 1216 1217 in6_unlink_ifa(ia, ifp); 1218 } 1219 1220 static void 1221 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1222 { 1223 int plen, iilen; 1224 struct in6_ifaddr *oia; 1225 1226 crit_enter(); 1227 1228 ifa_ifunlink(&ia->ia_ifa, ifp); 1229 1230 oia = ia; 1231 if (oia == (ia = in6_ifaddr)) 1232 in6_ifaddr = ia->ia_next; 1233 else { 1234 while (ia->ia_next && (ia->ia_next != oia)) 1235 ia = ia->ia_next; 1236 if (ia->ia_next) 1237 ia->ia_next = oia->ia_next; 1238 else { 1239 /* search failed */ 1240 kprintf("Couldn't unlink in6_ifaddr from in6_ifaddr\n"); 1241 } 1242 } 1243 1244 if (oia->ia6_ifpr) { /* check for safety */ 1245 plen = in6_mask2len(&oia->ia_prefixmask.sin6_addr, NULL); 1246 iilen = (sizeof(oia->ia_prefixmask.sin6_addr) << 3) - plen; 1247 in6_prefix_remove_ifid(iilen, oia); 1248 } 1249 1250 /* 1251 * When an autoconfigured address is being removed, release the 1252 * reference to the base prefix. Also, since the release might 1253 * affect the status of other (detached) addresses, call 1254 * pfxlist_onlink_check(). 1255 */ 1256 if (oia->ia6_flags & IN6_IFF_AUTOCONF) { 1257 if (oia->ia6_ndpr == NULL) { 1258 log(LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address " 1259 "%p has no prefix\n", oia); 1260 } else { 1261 oia->ia6_ndpr->ndpr_refcnt--; 1262 oia->ia6_flags &= ~IN6_IFF_AUTOCONF; 1263 oia->ia6_ndpr = NULL; 1264 } 1265 1266 pfxlist_onlink_check(); 1267 } 1268 1269 /* 1270 * release another refcnt for the link from in6_ifaddr. 1271 * Note that we should decrement the refcnt at least once for all *BSD. 1272 */ 1273 ifa_destroy(&oia->ia_ifa); 1274 1275 crit_exit(); 1276 } 1277 1278 void 1279 in6_purgeif(struct ifnet *ifp) 1280 { 1281 struct ifaddr_container *ifac, *next; 1282 1283 TAILQ_FOREACH_MUTABLE(ifac, &ifp->if_addrheads[mycpuid], 1284 ifa_link, next) { 1285 if (ifac->ifa->ifa_addr->sa_family != AF_INET6) 1286 continue; 1287 in6_purgeaddr(ifac->ifa); 1288 } 1289 1290 in6_ifdetach(ifp); 1291 } 1292 1293 /* 1294 * SIOC[GAD]LIFADDR. 1295 * SIOCGLIFADDR: get first address. (?) 1296 * SIOCGLIFADDR with IFLR_PREFIX: 1297 * get first address that matches the specified prefix. 1298 * SIOCALIFADDR: add the specified address. 1299 * SIOCALIFADDR with IFLR_PREFIX: 1300 * add the specified prefix, filling hostid part from 1301 * the first link-local address. prefixlen must be <= 64. 1302 * SIOCDLIFADDR: delete the specified address. 1303 * SIOCDLIFADDR with IFLR_PREFIX: 1304 * delete the first address that matches the specified prefix. 1305 * return values: 1306 * EINVAL on invalid parameters 1307 * EADDRNOTAVAIL on prefix match failed/specified address not found 1308 * other values may be returned from in6_ioctl() 1309 * 1310 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1311 * this is to accomodate address naming scheme other than RFC2374, 1312 * in the future. 1313 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1314 * address encoding scheme. (see figure on page 8) 1315 */ 1316 static int 1317 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 1318 struct ifnet *ifp, struct thread *td) 1319 { 1320 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1321 struct sockaddr *sa; 1322 1323 /* sanity checks */ 1324 if (!data || !ifp) { 1325 panic("invalid argument to in6_lifaddr_ioctl"); 1326 /*NOTRECHED*/ 1327 } 1328 1329 switch (cmd) { 1330 case SIOCGLIFADDR: 1331 /* address must be specified on GET with IFLR_PREFIX */ 1332 if (!(iflr->flags & IFLR_PREFIX)) 1333 break; 1334 /* FALLTHROUGH */ 1335 case SIOCALIFADDR: 1336 case SIOCDLIFADDR: 1337 /* address must be specified on ADD and DELETE */ 1338 sa = (struct sockaddr *)&iflr->addr; 1339 if (sa->sa_family != AF_INET6) 1340 return EINVAL; 1341 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1342 return EINVAL; 1343 /* XXX need improvement */ 1344 sa = (struct sockaddr *)&iflr->dstaddr; 1345 if (sa->sa_family && sa->sa_family != AF_INET6) 1346 return EINVAL; 1347 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1348 return EINVAL; 1349 break; 1350 default: /* shouldn't happen */ 1351 #if 0 1352 panic("invalid cmd to in6_lifaddr_ioctl"); 1353 /* NOTREACHED */ 1354 #else 1355 return EOPNOTSUPP; 1356 #endif 1357 } 1358 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) 1359 return EINVAL; 1360 1361 switch (cmd) { 1362 case SIOCALIFADDR: 1363 { 1364 struct in6_aliasreq ifra; 1365 struct in6_addr *hostid = NULL; 1366 int prefixlen; 1367 1368 if (iflr->flags & IFLR_PREFIX) { 1369 struct ifaddr *ifa; 1370 struct sockaddr_in6 *sin6; 1371 1372 /* 1373 * hostid is to fill in the hostid part of the 1374 * address. hostid points to the first link-local 1375 * address attached to the interface. 1376 */ 1377 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1378 if (!ifa) 1379 return EADDRNOTAVAIL; 1380 hostid = IFA_IN6(ifa); 1381 1382 /* prefixlen must be <= 64. */ 1383 if (64 < iflr->prefixlen) 1384 return EINVAL; 1385 prefixlen = iflr->prefixlen; 1386 1387 /* hostid part must be zero. */ 1388 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1389 if (sin6->sin6_addr.s6_addr32[2] != 0 1390 || sin6->sin6_addr.s6_addr32[3] != 0) { 1391 return EINVAL; 1392 } 1393 } else 1394 prefixlen = iflr->prefixlen; 1395 1396 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1397 bzero(&ifra, sizeof(ifra)); 1398 bcopy(iflr->iflr_name, ifra.ifra_name, 1399 sizeof(ifra.ifra_name)); 1400 1401 bcopy(&iflr->addr, &ifra.ifra_addr, 1402 ((struct sockaddr *)&iflr->addr)->sa_len); 1403 if (hostid) { 1404 /* fill in hostid part */ 1405 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1406 hostid->s6_addr32[2]; 1407 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1408 hostid->s6_addr32[3]; 1409 } 1410 1411 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/ 1412 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1413 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1414 if (hostid) { 1415 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1416 hostid->s6_addr32[2]; 1417 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1418 hostid->s6_addr32[3]; 1419 } 1420 } 1421 1422 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1423 in6_len2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1424 1425 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1426 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td); 1427 } 1428 case SIOCGLIFADDR: 1429 case SIOCDLIFADDR: 1430 { 1431 struct ifaddr_container *ifac; 1432 struct in6_ifaddr *ia; 1433 struct in6_addr mask, candidate, match; 1434 struct sockaddr_in6 *sin6; 1435 int cmp; 1436 1437 bzero(&mask, sizeof(mask)); 1438 if (iflr->flags & IFLR_PREFIX) { 1439 /* lookup a prefix rather than address. */ 1440 in6_len2mask(&mask, iflr->prefixlen); 1441 1442 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1443 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1444 match.s6_addr32[0] &= mask.s6_addr32[0]; 1445 match.s6_addr32[1] &= mask.s6_addr32[1]; 1446 match.s6_addr32[2] &= mask.s6_addr32[2]; 1447 match.s6_addr32[3] &= mask.s6_addr32[3]; 1448 1449 /* if you set extra bits, that's wrong */ 1450 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1451 return EINVAL; 1452 1453 cmp = 1; 1454 } else { 1455 if (cmd == SIOCGLIFADDR) { 1456 /* on getting an address, take the 1st match */ 1457 cmp = 0; /* XXX */ 1458 } else { 1459 /* on deleting an address, do exact match */ 1460 in6_len2mask(&mask, 128); 1461 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1462 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1463 1464 cmp = 1; 1465 } 1466 } 1467 1468 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1469 struct ifaddr *ifa = ifac->ifa; 1470 1471 if (ifa->ifa_addr->sa_family != AF_INET6) 1472 continue; 1473 if (!cmp) 1474 break; 1475 1476 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1477 /* 1478 * XXX: this is adhoc, but is necessary to allow 1479 * a user to specify fe80::/64 (not /10) for a 1480 * link-local address. 1481 */ 1482 if (IN6_IS_ADDR_LINKLOCAL(&candidate)) 1483 candidate.s6_addr16[1] = 0; 1484 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1485 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1486 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1487 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1488 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1489 break; 1490 } 1491 if (ifac == NULL) 1492 return EADDRNOTAVAIL; 1493 ia = ifa2ia6(ifac->ifa); 1494 1495 if (cmd == SIOCGLIFADDR) { 1496 struct sockaddr_in6 *s6; 1497 1498 /* fill in the if_laddrreq structure */ 1499 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1500 s6 = (struct sockaddr_in6 *)&iflr->addr; 1501 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) { 1502 s6->sin6_addr.s6_addr16[1] = 0; 1503 s6->sin6_scope_id = 1504 in6_addr2scopeid(ifp, &s6->sin6_addr); 1505 } 1506 if (ifp->if_flags & IFF_POINTOPOINT) { 1507 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1508 ia->ia_dstaddr.sin6_len); 1509 s6 = (struct sockaddr_in6 *)&iflr->dstaddr; 1510 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) { 1511 s6->sin6_addr.s6_addr16[1] = 0; 1512 s6->sin6_scope_id = 1513 in6_addr2scopeid(ifp, 1514 &s6->sin6_addr); 1515 } 1516 } else 1517 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1518 1519 iflr->prefixlen = 1520 in6_mask2len(&ia->ia_prefixmask.sin6_addr, 1521 NULL); 1522 1523 iflr->flags = ia->ia6_flags; /* XXX */ 1524 1525 return 0; 1526 } else { 1527 struct in6_aliasreq ifra; 1528 1529 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1530 bzero(&ifra, sizeof(ifra)); 1531 bcopy(iflr->iflr_name, ifra.ifra_name, 1532 sizeof(ifra.ifra_name)); 1533 1534 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1535 ia->ia_addr.sin6_len); 1536 if (ifp->if_flags & IFF_POINTOPOINT) 1537 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1538 ia->ia_dstaddr.sin6_len); 1539 else 1540 bzero(&ifra.ifra_dstaddr, 1541 sizeof(ifra.ifra_dstaddr)); 1542 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1543 ia->ia_prefixmask.sin6_len); 1544 1545 ifra.ifra_flags = ia->ia6_flags; 1546 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, 1547 ifp, td); 1548 } 1549 } 1550 } 1551 1552 return EOPNOTSUPP; /* just for safety */ 1553 } 1554 1555 /* 1556 * Initialize an interface's intetnet6 address 1557 * and routing table entry. 1558 */ 1559 static int 1560 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, struct sockaddr_in6 *sin6, 1561 int newhost) 1562 { 1563 int error = 0, plen, ifacount = 0; 1564 struct ifaddr_container *ifac; 1565 1566 /* 1567 * Give the interface a chance to initialize 1568 * if this is its first address, 1569 * and to validate the address if necessary. 1570 */ 1571 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1572 if (ifac->ifa->ifa_addr == NULL) 1573 continue; /* just for safety */ 1574 if (ifac->ifa->ifa_addr->sa_family != AF_INET6) 1575 continue; 1576 ifacount++; 1577 } 1578 1579 lwkt_serialize_enter(ifp->if_serializer); 1580 1581 ia->ia_addr = *sin6; 1582 1583 if (ifacount <= 1 && ifp->if_ioctl && 1584 (error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, 1585 (struct ucred *)NULL))) { 1586 lwkt_serialize_exit(ifp->if_serializer); 1587 return (error); 1588 } 1589 lwkt_serialize_exit(ifp->if_serializer); 1590 1591 ia->ia_ifa.ifa_metric = ifp->if_metric; 1592 1593 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1594 1595 /* 1596 * Special case: 1597 * If the destination address is specified for a point-to-point 1598 * interface, install a route to the destination as an interface 1599 * direct route. 1600 */ 1601 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1602 if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) { 1603 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, 1604 RTF_UP | RTF_HOST)) != 0) 1605 return (error); 1606 ia->ia_flags |= IFA_ROUTE; 1607 } 1608 if (plen < 128) { 1609 /* 1610 * The RTF_CLONING flag is necessary for in6_is_ifloop_auto(). 1611 */ 1612 ia->ia_ifa.ifa_flags |= RTF_CLONING; 1613 } 1614 1615 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1616 if (newhost) { 1617 /* set the rtrequest function to create llinfo */ 1618 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1619 in6_ifaddloop(&(ia->ia_ifa)); 1620 } 1621 1622 return (error); 1623 } 1624 1625 struct in6_multi_mship * 1626 in6_joingroup(struct ifnet *ifp, struct in6_addr *addr, int *errorp) 1627 { 1628 struct in6_multi_mship *imm; 1629 1630 imm = kmalloc(sizeof(*imm), M_IPMADDR, M_NOWAIT); 1631 if (!imm) { 1632 *errorp = ENOBUFS; 1633 return NULL; 1634 } 1635 imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp); 1636 if (!imm->i6mm_maddr) { 1637 /* *errorp is alrady set */ 1638 kfree(imm, M_IPMADDR); 1639 return NULL; 1640 } 1641 return imm; 1642 } 1643 1644 int 1645 in6_leavegroup(struct in6_multi_mship *imm) 1646 { 1647 1648 if (imm->i6mm_maddr) 1649 in6_delmulti(imm->i6mm_maddr); 1650 kfree(imm, M_IPMADDR); 1651 return 0; 1652 } 1653 1654 /* 1655 * Add an address to the list of IP6 multicast addresses for a 1656 * given interface. 1657 */ 1658 struct in6_multi * 1659 in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp, int *errorp) 1660 { 1661 struct in6_multi *in6m; 1662 struct sockaddr_in6 sin6; 1663 struct ifmultiaddr *ifma; 1664 1665 *errorp = 0; 1666 1667 crit_enter(); 1668 1669 /* 1670 * Call generic routine to add membership or increment 1671 * refcount. It wants addresses in the form of a sockaddr, 1672 * so we build one here (being careful to zero the unused bytes). 1673 */ 1674 bzero(&sin6, sizeof sin6); 1675 sin6.sin6_family = AF_INET6; 1676 sin6.sin6_len = sizeof sin6; 1677 sin6.sin6_addr = *maddr6; 1678 *errorp = if_addmulti(ifp, (struct sockaddr *)&sin6, &ifma); 1679 if (*errorp) { 1680 crit_exit(); 1681 return 0; 1682 } 1683 1684 /* 1685 * If ifma->ifma_protospec is null, then if_addmulti() created 1686 * a new record. Otherwise, we are done. 1687 */ 1688 if (ifma->ifma_protospec != 0) { 1689 crit_exit(); 1690 return ifma->ifma_protospec; 1691 } 1692 1693 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 1694 at interrupt time? If so, need to fix if_addmulti. XXX */ 1695 in6m = (struct in6_multi *)kmalloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT); 1696 if (in6m == NULL) { 1697 crit_exit(); 1698 return (NULL); 1699 } 1700 1701 bzero(in6m, sizeof *in6m); 1702 in6m->in6m_addr = *maddr6; 1703 in6m->in6m_ifp = ifp; 1704 in6m->in6m_ifma = ifma; 1705 ifma->ifma_protospec = in6m; 1706 LIST_INSERT_HEAD(&in6_multihead, in6m, in6m_entry); 1707 1708 /* 1709 * Let MLD6 know that we have joined a new IP6 multicast 1710 * group. 1711 */ 1712 mld6_start_listening(in6m); 1713 crit_exit(); 1714 return (in6m); 1715 } 1716 1717 /* 1718 * Delete a multicast address record. 1719 */ 1720 void 1721 in6_delmulti(struct in6_multi *in6m) 1722 { 1723 struct ifmultiaddr *ifma = in6m->in6m_ifma; 1724 1725 crit_enter(); 1726 1727 if (ifma->ifma_refcount == 1) { 1728 /* 1729 * No remaining claims to this record; let MLD6 know 1730 * that we are leaving the multicast group. 1731 */ 1732 mld6_stop_listening(in6m); 1733 ifma->ifma_protospec = 0; 1734 LIST_REMOVE(in6m, in6m_entry); 1735 kfree(in6m, M_IPMADDR); 1736 } 1737 /* XXX - should be separate API for when we have an ifma? */ 1738 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1739 crit_exit(); 1740 } 1741 1742 /* 1743 * Find an IPv6 interface link-local address specific to an interface. 1744 */ 1745 struct in6_ifaddr * 1746 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1747 { 1748 struct ifaddr_container *ifac; 1749 1750 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1751 struct ifaddr *ifa = ifac->ifa; 1752 1753 if (ifa->ifa_addr == NULL) 1754 continue; /* just for safety */ 1755 if (ifa->ifa_addr->sa_family != AF_INET6) 1756 continue; 1757 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1758 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1759 ignoreflags) != 0) 1760 continue; 1761 break; 1762 } 1763 } 1764 if (ifac != NULL) 1765 return ((struct in6_ifaddr *)(ifac->ifa)); 1766 else 1767 return (NULL); 1768 } 1769 1770 1771 /* 1772 * find the internet address corresponding to a given interface and address. 1773 */ 1774 struct in6_ifaddr * 1775 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr) 1776 { 1777 struct ifaddr_container *ifac; 1778 1779 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1780 struct ifaddr *ifa = ifac->ifa; 1781 1782 if (ifa->ifa_addr == NULL) 1783 continue; /* just for safety */ 1784 if (ifa->ifa_addr->sa_family != AF_INET6) 1785 continue; 1786 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1787 break; 1788 } 1789 if (ifac != NULL) 1790 return ((struct in6_ifaddr *)(ifac->ifa)); 1791 else 1792 return (NULL); 1793 } 1794 1795 /* 1796 * find the internet address on a given interface corresponding to a neighbor's 1797 * address. 1798 */ 1799 struct in6_ifaddr * 1800 in6ifa_ifplocaladdr(const struct ifnet *ifp, const struct in6_addr *addr) 1801 { 1802 struct ifaddr *ifa; 1803 struct in6_ifaddr *ia; 1804 struct ifaddr_container *ifac; 1805 1806 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1807 ifa = ifac->ifa; 1808 1809 if (ifa->ifa_addr == NULL) 1810 continue; /* just for safety */ 1811 if (ifa->ifa_addr->sa_family != AF_INET6) 1812 continue; 1813 ia = (struct in6_ifaddr *)ifa; 1814 if (IN6_ARE_MASKED_ADDR_EQUAL(addr, 1815 &ia->ia_addr.sin6_addr, 1816 &ia->ia_prefixmask.sin6_addr)) 1817 return ia; 1818 } 1819 1820 return NULL; 1821 } 1822 1823 /* 1824 * Convert IP6 address to printable (loggable) representation. 1825 */ 1826 static char digits[] = "0123456789abcdef"; 1827 static int ip6round = 0; 1828 char * 1829 ip6_sprintf(const struct in6_addr *addr) 1830 { 1831 static char ip6buf[8][48]; 1832 int i; 1833 char *cp; 1834 const u_short *a = (const u_short *)addr; 1835 const u_char *d; 1836 int dcolon = 0; 1837 1838 ip6round = (ip6round + 1) & 7; 1839 cp = ip6buf[ip6round]; 1840 1841 for (i = 0; i < 8; i++) { 1842 if (dcolon == 1) { 1843 if (*a == 0) { 1844 if (i == 7) 1845 *cp++ = ':'; 1846 a++; 1847 continue; 1848 } else 1849 dcolon = 2; 1850 } 1851 if (*a == 0) { 1852 if (dcolon == 0 && *(a + 1) == 0) { 1853 if (i == 0) 1854 *cp++ = ':'; 1855 *cp++ = ':'; 1856 dcolon = 1; 1857 } else { 1858 *cp++ = '0'; 1859 *cp++ = ':'; 1860 } 1861 a++; 1862 continue; 1863 } 1864 d = (const u_char *)a; 1865 *cp++ = digits[*d >> 4]; 1866 *cp++ = digits[*d++ & 0xf]; 1867 *cp++ = digits[*d >> 4]; 1868 *cp++ = digits[*d & 0xf]; 1869 *cp++ = ':'; 1870 a++; 1871 } 1872 *--cp = 0; 1873 return (ip6buf[ip6round]); 1874 } 1875 1876 int 1877 in6_localaddr(struct in6_addr *in6) 1878 { 1879 struct in6_ifaddr *ia; 1880 1881 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1882 return 1; 1883 1884 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 1885 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1886 &ia->ia_prefixmask.sin6_addr)) 1887 return 1; 1888 1889 return (0); 1890 } 1891 1892 int 1893 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1894 { 1895 struct in6_ifaddr *ia; 1896 1897 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1898 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1899 &sa6->sin6_addr) && 1900 (ia->ia6_flags & IN6_IFF_DEPRECATED)) 1901 return (1); /* true */ 1902 1903 /* XXX: do we still have to go thru the rest of the list? */ 1904 } 1905 1906 return (0); /* false */ 1907 } 1908 1909 /* 1910 * return length of part which dst and src are equal 1911 * hard coding... 1912 */ 1913 int 1914 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1915 { 1916 int match = 0; 1917 u_char *s = (u_char *)src, *d = (u_char *)dst; 1918 u_char *lim = s + 16, r; 1919 1920 while (s < lim) 1921 if ((r = (*d++ ^ *s++)) != 0) { 1922 while (r < 128) { 1923 match++; 1924 r <<= 1; 1925 } 1926 break; 1927 } else 1928 match += 8; 1929 return match; 1930 } 1931 1932 /* XXX: to be scope conscious */ 1933 int 1934 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1935 { 1936 int bytelen, bitlen; 1937 1938 /* sanity check */ 1939 if (0 > len || len > 128) { 1940 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1941 len); 1942 return (0); 1943 } 1944 1945 bytelen = len / 8; 1946 bitlen = len % 8; 1947 1948 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1949 return (0); 1950 if (p1->s6_addr[bytelen] >> (8 - bitlen) != 1951 p2->s6_addr[bytelen] >> (8 - bitlen)) 1952 return (0); 1953 1954 return (1); 1955 } 1956 1957 void 1958 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1959 { 1960 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1961 int bytelen, bitlen, i; 1962 1963 /* sanity check */ 1964 if (0 > len || len > 128) { 1965 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1966 len); 1967 return; 1968 } 1969 1970 bzero(maskp, sizeof(*maskp)); 1971 bytelen = len / 8; 1972 bitlen = len % 8; 1973 for (i = 0; i < bytelen; i++) 1974 maskp->s6_addr[i] = 0xff; 1975 if (bitlen) 1976 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1977 } 1978 1979 /* 1980 * return the best address out of the same scope 1981 */ 1982 struct in6_ifaddr * 1983 in6_ifawithscope(struct ifnet *oifp, struct in6_addr *dst) 1984 { 1985 int dst_scope = in6_addrscope(dst), src_scope, best_scope = 0; 1986 int blen = -1; 1987 struct ifnet *ifp; 1988 struct in6_ifaddr *ifa_best = NULL; 1989 1990 if (oifp == NULL) { 1991 #if 0 1992 kprintf("in6_ifawithscope: output interface is not specified\n"); 1993 #endif 1994 return (NULL); 1995 } 1996 1997 /* 1998 * We search for all addresses on all interfaces from the beginning. 1999 * Comparing an interface with the outgoing interface will be done 2000 * only at the final stage of tiebreaking. 2001 */ 2002 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 2003 { 2004 struct ifaddr_container *ifac; 2005 2006 /* 2007 * We can never take an address that breaks the scope zone 2008 * of the destination. 2009 */ 2010 if (in6_addr2scopeid(ifp, dst) != in6_addr2scopeid(oifp, dst)) 2011 continue; 2012 2013 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2014 int tlen = -1, dscopecmp, bscopecmp, matchcmp; 2015 struct ifaddr *ifa = ifac->ifa; 2016 2017 if (ifa->ifa_addr->sa_family != AF_INET6) 2018 continue; 2019 2020 src_scope = in6_addrscope(IFA_IN6(ifa)); 2021 2022 /* 2023 * Don't use an address before completing DAD 2024 * nor a duplicated address. 2025 */ 2026 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2027 IN6_IFF_NOTREADY) 2028 continue; 2029 2030 /* XXX: is there any case to allow anycasts? */ 2031 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2032 IN6_IFF_ANYCAST) 2033 continue; 2034 2035 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2036 IN6_IFF_DETACHED) 2037 continue; 2038 2039 /* 2040 * If this is the first address we find, 2041 * keep it anyway. 2042 */ 2043 if (ifa_best == NULL) 2044 goto replace; 2045 2046 /* 2047 * ifa_best is never NULL beyond this line except 2048 * within the block labeled "replace". 2049 */ 2050 2051 /* 2052 * If ifa_best has a smaller scope than dst and 2053 * the current address has a larger one than 2054 * (or equal to) dst, always replace ifa_best. 2055 * Also, if the current address has a smaller scope 2056 * than dst, ignore it unless ifa_best also has a 2057 * smaller scope. 2058 * Consequently, after the two if-clause below, 2059 * the followings must be satisfied: 2060 * (scope(src) < scope(dst) && 2061 * scope(best) < scope(dst)) 2062 * OR 2063 * (scope(best) >= scope(dst) && 2064 * scope(src) >= scope(dst)) 2065 */ 2066 if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0 && 2067 IN6_ARE_SCOPE_CMP(src_scope, dst_scope) >= 0) 2068 goto replace; /* (A) */ 2069 if (IN6_ARE_SCOPE_CMP(src_scope, dst_scope) < 0 && 2070 IN6_ARE_SCOPE_CMP(best_scope, dst_scope) >= 0) 2071 continue; /* (B) */ 2072 2073 /* 2074 * A deprecated address SHOULD NOT be used in new 2075 * communications if an alternate (non-deprecated) 2076 * address is available and has sufficient scope. 2077 * RFC 2462, Section 5.5.4. 2078 */ 2079 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2080 IN6_IFF_DEPRECATED) { 2081 /* 2082 * Ignore any deprecated addresses if 2083 * specified by configuration. 2084 */ 2085 if (!ip6_use_deprecated) 2086 continue; 2087 2088 /* 2089 * If we have already found a non-deprecated 2090 * candidate, just ignore deprecated addresses. 2091 */ 2092 if (!(ifa_best->ia6_flags & IN6_IFF_DEPRECATED)) 2093 continue; 2094 } 2095 2096 /* 2097 * A non-deprecated address is always preferred 2098 * to a deprecated one regardless of scopes and 2099 * address matching (Note invariants ensured by the 2100 * conditions (A) and (B) above.) 2101 */ 2102 if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) && 2103 !(((struct in6_ifaddr *)ifa)->ia6_flags & 2104 IN6_IFF_DEPRECATED)) 2105 goto replace; 2106 2107 /* 2108 * When we use temporary addresses described in 2109 * RFC 3041, we prefer temporary addresses to 2110 * public autoconf addresses. Again, note the 2111 * invariants from (A) and (B). Also note that we 2112 * don't have any preference between static addresses 2113 * and autoconf addresses (despite of whether or not 2114 * the latter is temporary or public.) 2115 */ 2116 if (ip6_use_tempaddr) { 2117 struct in6_ifaddr *ifat; 2118 2119 ifat = (struct in6_ifaddr *)ifa; 2120 if ((ifa_best->ia6_flags & 2121 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2122 == IN6_IFF_AUTOCONF && 2123 (ifat->ia6_flags & 2124 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2125 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) { 2126 goto replace; 2127 } 2128 if ((ifa_best->ia6_flags & 2129 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2130 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY) && 2131 (ifat->ia6_flags & 2132 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2133 == IN6_IFF_AUTOCONF) { 2134 continue; 2135 } 2136 } 2137 2138 /* 2139 * At this point, we have two cases: 2140 * 1. we are looking at a non-deprecated address, 2141 * and ifa_best is also non-deprecated. 2142 * 2. we are looking at a deprecated address, 2143 * and ifa_best is also deprecated. 2144 * Also, we do not have to consider a case where 2145 * the scope of if_best is larger(smaller) than dst and 2146 * the scope of the current address is smaller(larger) 2147 * than dst. Such a case has already been covered. 2148 * Tiebreaking is done according to the following 2149 * items: 2150 * - the scope comparison between the address and 2151 * dst (dscopecmp) 2152 * - the scope comparison between the address and 2153 * ifa_best (bscopecmp) 2154 * - if the address match dst longer than ifa_best 2155 * (matchcmp) 2156 * - if the address is on the outgoing I/F (outI/F) 2157 * 2158 * Roughly speaking, the selection policy is 2159 * - the most important item is scope. The same scope 2160 * is best. Then search for a larger scope. 2161 * Smaller scopes are the last resort. 2162 * - A deprecated address is chosen only when we have 2163 * no address that has an enough scope, but is 2164 * prefered to any addresses of smaller scopes 2165 * (this must be already done above.) 2166 * - addresses on the outgoing I/F are preferred to 2167 * ones on other interfaces if none of above 2168 * tiebreaks. In the table below, the column "bI" 2169 * means if the best_ifa is on the outgoing 2170 * interface, and the column "sI" means if the ifa 2171 * is on the outgoing interface. 2172 * - If there is no other reasons to choose one, 2173 * longest address match against dst is considered. 2174 * 2175 * The precise decision table is as follows: 2176 * dscopecmp bscopecmp match bI oI | replace? 2177 * N/A equal N/A Y N | No (1) 2178 * N/A equal N/A N Y | Yes (2) 2179 * N/A equal larger N/A | Yes (3) 2180 * N/A equal !larger N/A | No (4) 2181 * larger larger N/A N/A | No (5) 2182 * larger smaller N/A N/A | Yes (6) 2183 * smaller larger N/A N/A | Yes (7) 2184 * smaller smaller N/A N/A | No (8) 2185 * equal smaller N/A N/A | Yes (9) 2186 * equal larger (already done at A above) 2187 */ 2188 dscopecmp = IN6_ARE_SCOPE_CMP(src_scope, dst_scope); 2189 bscopecmp = IN6_ARE_SCOPE_CMP(src_scope, best_scope); 2190 2191 if (bscopecmp == 0) { 2192 struct ifnet *bifp = ifa_best->ia_ifp; 2193 2194 if (bifp == oifp && ifp != oifp) /* (1) */ 2195 continue; 2196 if (bifp != oifp && ifp == oifp) /* (2) */ 2197 goto replace; 2198 2199 /* 2200 * Both bifp and ifp are on the outgoing 2201 * interface, or both two are on a different 2202 * interface from the outgoing I/F. 2203 * now we need address matching against dst 2204 * for tiebreaking. 2205 */ 2206 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2207 matchcmp = tlen - blen; 2208 if (matchcmp > 0) /* (3) */ 2209 goto replace; 2210 continue; /* (4) */ 2211 } 2212 if (dscopecmp > 0) { 2213 if (bscopecmp > 0) /* (5) */ 2214 continue; 2215 goto replace; /* (6) */ 2216 } 2217 if (dscopecmp < 0) { 2218 if (bscopecmp > 0) /* (7) */ 2219 goto replace; 2220 continue; /* (8) */ 2221 } 2222 2223 /* now dscopecmp must be 0 */ 2224 if (bscopecmp < 0) 2225 goto replace; /* (9) */ 2226 2227 replace: 2228 ifa_best = (struct in6_ifaddr *)ifa; 2229 blen = tlen >= 0 ? tlen : 2230 in6_matchlen(IFA_IN6(ifa), dst); 2231 best_scope = in6_addrscope(&ifa_best->ia_addr.sin6_addr); 2232 } 2233 } 2234 2235 /* count statistics for future improvements */ 2236 if (ifa_best == NULL) 2237 ip6stat.ip6s_sources_none++; 2238 else { 2239 if (oifp == ifa_best->ia_ifp) 2240 ip6stat.ip6s_sources_sameif[best_scope]++; 2241 else 2242 ip6stat.ip6s_sources_otherif[best_scope]++; 2243 2244 if (best_scope == dst_scope) 2245 ip6stat.ip6s_sources_samescope[best_scope]++; 2246 else 2247 ip6stat.ip6s_sources_otherscope[best_scope]++; 2248 2249 if (ifa_best->ia6_flags & IN6_IFF_DEPRECATED) 2250 ip6stat.ip6s_sources_deprecated[best_scope]++; 2251 } 2252 2253 return (ifa_best); 2254 } 2255 2256 /* 2257 * return the best address out of the same scope. if no address was 2258 * found, return the first valid address from designated IF. 2259 */ 2260 struct in6_ifaddr * 2261 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2262 { 2263 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2264 struct ifaddr_container *ifac; 2265 struct in6_ifaddr *besta = 0; 2266 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2267 2268 dep[0] = dep[1] = NULL; 2269 2270 /* 2271 * We first look for addresses in the same scope. 2272 * If there is one, return it. 2273 * If two or more, return one which matches the dst longest. 2274 * If none, return one of global addresses assigned other ifs. 2275 */ 2276 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2277 struct ifaddr *ifa = ifac->ifa; 2278 2279 if (ifa->ifa_addr->sa_family != AF_INET6) 2280 continue; 2281 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2282 continue; /* XXX: is there any case to allow anycast? */ 2283 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2284 continue; /* don't use this interface */ 2285 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2286 continue; 2287 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2288 if (ip6_use_deprecated) 2289 dep[0] = (struct in6_ifaddr *)ifa; 2290 continue; 2291 } 2292 2293 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2294 /* 2295 * call in6_matchlen() as few as possible 2296 */ 2297 if (besta) { 2298 if (blen == -1) 2299 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2300 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2301 if (tlen > blen) { 2302 blen = tlen; 2303 besta = (struct in6_ifaddr *)ifa; 2304 } 2305 } else 2306 besta = (struct in6_ifaddr *)ifa; 2307 } 2308 } 2309 if (besta) 2310 return (besta); 2311 2312 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2313 struct ifaddr *ifa = ifac->ifa; 2314 2315 if (ifa->ifa_addr->sa_family != AF_INET6) 2316 continue; 2317 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2318 continue; /* XXX: is there any case to allow anycast? */ 2319 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2320 continue; /* don't use this interface */ 2321 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2322 continue; 2323 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2324 if (ip6_use_deprecated) 2325 dep[1] = (struct in6_ifaddr *)ifa; 2326 continue; 2327 } 2328 2329 return (struct in6_ifaddr *)ifa; 2330 } 2331 2332 /* use the last-resort values, that are, deprecated addresses */ 2333 if (dep[0]) 2334 return dep[0]; 2335 if (dep[1]) 2336 return dep[1]; 2337 2338 return NULL; 2339 } 2340 2341 /* 2342 * perform DAD when interface becomes IFF_UP. 2343 */ 2344 void 2345 in6_if_up(struct ifnet *ifp) 2346 { 2347 struct ifaddr_container *ifac; 2348 struct in6_ifaddr *ia; 2349 int dad_delay; /* delay ticks before DAD output */ 2350 2351 /* 2352 * special cases, like 6to4, are handled in in6_ifattach 2353 */ 2354 in6_ifattach(ifp, NULL); 2355 2356 dad_delay = 0; 2357 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2358 struct ifaddr *ifa = ifac->ifa; 2359 2360 if (ifa->ifa_addr->sa_family != AF_INET6) 2361 continue; 2362 ia = (struct in6_ifaddr *)ifa; 2363 if (ia->ia6_flags & IN6_IFF_TENTATIVE) 2364 nd6_dad_start(ifa, &dad_delay); 2365 } 2366 } 2367 2368 int 2369 in6if_do_dad(struct ifnet *ifp) 2370 { 2371 if (ifp->if_flags & IFF_LOOPBACK) 2372 return (0); 2373 2374 switch (ifp->if_type) { 2375 #ifdef IFT_DUMMY 2376 case IFT_DUMMY: 2377 #endif 2378 case IFT_FAITH: 2379 /* 2380 * These interfaces do not have the IFF_LOOPBACK flag, 2381 * but loop packets back. We do not have to do DAD on such 2382 * interfaces. We should even omit it, because loop-backed 2383 * NS would confuse the DAD procedure. 2384 */ 2385 return (0); 2386 default: 2387 /* 2388 * Our DAD routine requires the interface up and running. 2389 * However, some interfaces can be up before the RUNNING 2390 * status. Additionaly, users may try to assign addresses 2391 * before the interface becomes up (or running). 2392 * We simply skip DAD in such a case as a work around. 2393 * XXX: we should rather mark "tentative" on such addresses, 2394 * and do DAD after the interface becomes ready. 2395 */ 2396 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != 2397 (IFF_UP|IFF_RUNNING)) 2398 return (0); 2399 2400 return (1); 2401 } 2402 } 2403 2404 /* 2405 * Calculate max IPv6 MTU through all the interfaces and store it 2406 * to in6_maxmtu. 2407 */ 2408 void 2409 in6_setmaxmtu(void) 2410 { 2411 unsigned long maxmtu = 0; 2412 struct ifnet *ifp; 2413 2414 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 2415 { 2416 if (!(ifp->if_flags & IFF_LOOPBACK) && 2417 ND_IFINFO(ifp)->linkmtu > maxmtu) 2418 maxmtu = ND_IFINFO(ifp)->linkmtu; 2419 } 2420 if (maxmtu) /* update only when maxmtu is positive */ 2421 in6_maxmtu = maxmtu; 2422 } 2423 2424 void * 2425 in6_domifattach(struct ifnet *ifp) 2426 { 2427 struct in6_ifextra *ext; 2428 2429 ext = (struct in6_ifextra *)kmalloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2430 bzero(ext, sizeof(*ext)); 2431 2432 ext->in6_ifstat = (struct in6_ifstat *)kmalloc(sizeof(struct in6_ifstat), 2433 M_IFADDR, M_WAITOK); 2434 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat)); 2435 2436 ext->icmp6_ifstat = 2437 (struct icmp6_ifstat *)kmalloc(sizeof(struct icmp6_ifstat), 2438 M_IFADDR, M_WAITOK); 2439 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat)); 2440 2441 ext->nd_ifinfo = nd6_ifattach(ifp); 2442 ext->scope6_id = scope6_ifattach(ifp); 2443 return ext; 2444 } 2445 2446 void 2447 in6_domifdetach(struct ifnet *ifp, void *aux) 2448 { 2449 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2450 scope6_ifdetach(ext->scope6_id); 2451 nd6_ifdetach(ext->nd_ifinfo); 2452 kfree(ext->in6_ifstat, M_IFADDR); 2453 kfree(ext->icmp6_ifstat, M_IFADDR); 2454 kfree(ext, M_IFADDR); 2455 } 2456 2457 /* 2458 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2459 * v4 mapped addr or v4 compat addr 2460 */ 2461 void 2462 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2463 { 2464 bzero(sin, sizeof(*sin)); 2465 sin->sin_len = sizeof(struct sockaddr_in); 2466 sin->sin_family = AF_INET; 2467 sin->sin_port = sin6->sin6_port; 2468 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2469 } 2470 2471 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2472 void 2473 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2474 { 2475 bzero(sin6, sizeof(*sin6)); 2476 sin6->sin6_len = sizeof(struct sockaddr_in6); 2477 sin6->sin6_family = AF_INET6; 2478 sin6->sin6_port = sin->sin_port; 2479 sin6->sin6_addr.s6_addr32[0] = 0; 2480 sin6->sin6_addr.s6_addr32[1] = 0; 2481 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2482 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2483 } 2484 2485 /* Convert sockaddr_in6 into sockaddr_in. */ 2486 void 2487 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2488 { 2489 struct sockaddr_in *sin_p; 2490 struct sockaddr_in6 sin6; 2491 2492 /* 2493 * Save original sockaddr_in6 addr and convert it 2494 * to sockaddr_in. 2495 */ 2496 sin6 = *(struct sockaddr_in6 *)nam; 2497 sin_p = (struct sockaddr_in *)nam; 2498 in6_sin6_2_sin(sin_p, &sin6); 2499 } 2500 2501 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2502 void 2503 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2504 { 2505 struct sockaddr_in *sin_p; 2506 struct sockaddr_in6 *sin6_p; 2507 2508 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 2509 M_WAITOK); 2510 sin_p = (struct sockaddr_in *)*nam; 2511 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2512 FREE(*nam, M_SONAME); 2513 *nam = (struct sockaddr *)sin6_p; 2514 } 2515