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 #include <sys/thread2.h> 85 86 #include <net/if.h> 87 #include <net/if_types.h> 88 #include <net/route.h> 89 #include <net/if_dl.h> 90 91 #include <netinet/in.h> 92 #include <netinet/in_var.h> 93 #include <netinet/if_ether.h> 94 #include <netinet/in_systm.h> 95 #include <netinet/ip.h> 96 #include <netinet/in_pcb.h> 97 98 #include <netinet/ip6.h> 99 #include <netinet6/ip6_var.h> 100 #include <netinet6/nd6.h> 101 #include <netinet6/mld6_var.h> 102 #include <netinet6/ip6_mroute.h> 103 #include <netinet6/in6_ifattach.h> 104 #include <netinet6/scope6_var.h> 105 #include <netinet6/in6_pcb.h> 106 #include <netinet6/in6_var.h> 107 108 #include <net/net_osdep.h> 109 110 /* 111 * Definitions of some costant IP6 addresses. 112 */ 113 const struct in6_addr kin6addr_any = IN6ADDR_ANY_INIT; 114 const struct in6_addr kin6addr_loopback = IN6ADDR_LOOPBACK_INIT; 115 const struct in6_addr kin6addr_nodelocal_allnodes = 116 IN6ADDR_NODELOCAL_ALLNODES_INIT; 117 const struct in6_addr kin6addr_linklocal_allnodes = 118 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 119 const struct in6_addr kin6addr_linklocal_allrouters = 120 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 121 122 const struct in6_addr in6mask0 = IN6MASK0; 123 const struct in6_addr in6mask32 = IN6MASK32; 124 const struct in6_addr in6mask64 = IN6MASK64; 125 const struct in6_addr in6mask96 = IN6MASK96; 126 const struct in6_addr in6mask128 = IN6MASK128; 127 128 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6, 129 0, 0, IN6ADDR_ANY_INIT, 0}; 130 131 static int in6_lifaddr_ioctl (struct socket *, u_long, caddr_t, 132 struct ifnet *, struct thread *); 133 static int in6_ifinit (struct ifnet *, struct in6_ifaddr *, 134 struct sockaddr_in6 *, int); 135 static void in6_unlink_ifa (struct in6_ifaddr *, struct ifnet *); 136 static void in6_ifloop_request_callback(int, int, struct rt_addrinfo *, struct rtentry *, void *); 137 138 struct in6_multihead in6_multihead; /* XXX BSS initialization */ 139 140 int (*faithprefix_p)(struct in6_addr *); 141 142 /* 143 * Subroutine for in6_ifaddloop() and in6_ifremloop(). 144 * This routine does actual work. 145 */ 146 static void 147 in6_ifloop_request(int cmd, struct ifaddr *ifa) 148 { 149 struct sockaddr_in6 all1_sa; 150 struct rt_addrinfo rtinfo; 151 int error; 152 153 bzero(&all1_sa, sizeof(all1_sa)); 154 all1_sa.sin6_family = AF_INET6; 155 all1_sa.sin6_len = sizeof(struct sockaddr_in6); 156 all1_sa.sin6_addr = in6mask128; 157 158 /* 159 * We specify the address itself as the gateway, and set the 160 * RTF_LLINFO flag, so that the corresponding host route would have 161 * the flag, and thus applications that assume traditional behavior 162 * would be happy. Note that we assume the caller of the function 163 * (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest, 164 * which changes the outgoing interface to the loopback interface. 165 */ 166 bzero(&rtinfo, sizeof(struct rt_addrinfo)); 167 rtinfo.rti_info[RTAX_DST] = ifa->ifa_addr; 168 rtinfo.rti_info[RTAX_GATEWAY] = ifa->ifa_addr; 169 rtinfo.rti_info[RTAX_NETMASK] = (struct sockaddr *)&all1_sa; 170 rtinfo.rti_flags = RTF_UP|RTF_HOST|RTF_LLINFO; 171 172 error = rtrequest1_global(cmd, &rtinfo, 173 in6_ifloop_request_callback, ifa); 174 if (error != 0) { 175 log(LOG_ERR, "in6_ifloop_request: " 176 "%s operation failed for %s (errno=%d)\n", 177 cmd == RTM_ADD ? "ADD" : "DELETE", 178 ip6_sprintf(&((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr), 179 error); 180 } 181 } 182 183 static void 184 in6_ifloop_request_callback(int cmd, int error, struct rt_addrinfo *rtinfo, 185 struct rtentry *rt, void *arg) 186 { 187 struct ifaddr *ifa = arg; 188 189 if (error) 190 goto done; 191 192 /* 193 * Make sure rt_ifa be equal to IFA, the second argument of the 194 * function. 195 * We need this because when we refer to rt_ifa->ia6_flags in 196 * ip6_input, we assume that the rt_ifa points to the address instead 197 * of the loopback address. 198 */ 199 if (cmd == RTM_ADD && rt && ifa != rt->rt_ifa) { 200 ++rt->rt_refcnt; 201 IFAFREE(rt->rt_ifa); 202 IFAREF(ifa); 203 rt->rt_ifa = ifa; 204 --rt->rt_refcnt; 205 } 206 207 /* 208 * Report the addition/removal of the address to the routing socket. 209 * XXX: since we called rtinit for a p2p interface with a destination, 210 * we end up reporting twice in such a case. Should we rather 211 * omit the second report? 212 */ 213 if (rt) { 214 if (mycpuid == 0) 215 rt_newaddrmsg(cmd, ifa, error, rt); 216 if (cmd == RTM_DELETE) { 217 if (rt->rt_refcnt == 0) { 218 ++rt->rt_refcnt; 219 rtfree(rt); 220 } 221 } 222 } 223 done: 224 /* no way to return any new error */ 225 ; 226 } 227 228 /* 229 * Add ownaddr as loopback rtentry. We previously add the route only if 230 * necessary (ex. on a p2p link). However, since we now manage addresses 231 * separately from prefixes, we should always add the route. We can't 232 * rely on the cloning mechanism from the corresponding interface route 233 * any more. 234 */ 235 void 236 in6_ifaddloop(struct ifaddr *ifa) 237 { 238 struct rtentry *rt; 239 240 /* If there is no loopback entry, allocate one. */ 241 rt = rtpurelookup(ifa->ifa_addr); 242 if (rt == NULL || !(rt->rt_flags & RTF_HOST) || 243 !(rt->rt_ifp->if_flags & IFF_LOOPBACK)) 244 in6_ifloop_request(RTM_ADD, ifa); 245 if (rt != NULL) 246 rt->rt_refcnt--; 247 } 248 249 /* 250 * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(), 251 * if it exists. 252 */ 253 void 254 in6_ifremloop(struct ifaddr *ifa) 255 { 256 struct in6_ifaddr *ia; 257 struct rtentry *rt; 258 int ia_count = 0; 259 260 /* 261 * Some of BSD variants do not remove cloned routes 262 * from an interface direct route, when removing the direct route 263 * (see comments in net/net_osdep.h). Even for variants that do remove 264 * cloned routes, they could fail to remove the cloned routes when 265 * we handle multple addresses that share a common prefix. 266 * So, we should remove the route corresponding to the deleted address 267 * regardless of the result of in6_is_ifloop_auto(). 268 */ 269 270 /* 271 * Delete the entry only if exact one ifa exists. More than one ifa 272 * can exist if we assign a same single address to multiple 273 * (probably p2p) interfaces. 274 * XXX: we should avoid such a configuration in IPv6... 275 */ 276 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 277 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) { 278 ia_count++; 279 if (ia_count > 1) 280 break; 281 } 282 } 283 284 if (ia_count == 1) { 285 /* 286 * Before deleting, check if a corresponding loopbacked host 287 * route surely exists. With this check, we can avoid to 288 * delete an interface direct route whose destination is same 289 * as the address being removed. This can happen when remofing 290 * a subnet-router anycast address on an interface attahced 291 * to a shared medium. 292 */ 293 rt = rtpurelookup(ifa->ifa_addr); 294 if (rt != NULL && (rt->rt_flags & RTF_HOST) && 295 (rt->rt_ifp->if_flags & IFF_LOOPBACK)) { 296 rt->rt_refcnt--; 297 in6_ifloop_request(RTM_DELETE, ifa); 298 } 299 } 300 } 301 302 int 303 in6_ifindex2scopeid(int idx) 304 { 305 struct ifnet *ifp; 306 struct sockaddr_in6 *sin6; 307 struct ifaddr_container *ifac; 308 309 if (idx < 0 || if_index < idx) 310 return -1; 311 ifp = ifindex2ifnet[idx]; 312 313 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) 314 { 315 struct ifaddr *ifa = ifac->ifa; 316 317 if (ifa->ifa_addr->sa_family != AF_INET6) 318 continue; 319 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 320 if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) 321 return sin6->sin6_scope_id & 0xffff; 322 } 323 324 return -1; 325 } 326 327 int 328 in6_mask2len(struct in6_addr *mask, u_char *lim0) 329 { 330 int x = 0, y; 331 u_char *lim = lim0, *p; 332 333 if (lim0 == NULL || 334 lim0 - (u_char *)mask > sizeof(*mask)) /* ignore the scope_id part */ 335 lim = (u_char *)mask + sizeof(*mask); 336 for (p = (u_char *)mask; p < lim; x++, p++) { 337 if (*p != 0xff) 338 break; 339 } 340 y = 0; 341 if (p < lim) { 342 for (y = 0; y < 8; y++) { 343 if ((*p & (0x80 >> y)) == 0) 344 break; 345 } 346 } 347 348 /* 349 * when the limit pointer is given, do a stricter check on the 350 * remaining bits. 351 */ 352 if (p < lim) { 353 if (y != 0 && (*p & (0x00ff >> y)) != 0) 354 return (-1); 355 for (p = p + 1; p < lim; p++) 356 if (*p != 0) 357 return (-1); 358 } 359 360 return x * 8 + y; 361 } 362 363 void 364 in6_len2mask(struct in6_addr *mask, int len) 365 { 366 int i; 367 368 bzero(mask, sizeof(*mask)); 369 for (i = 0; i < len / 8; i++) 370 mask->s6_addr8[i] = 0xff; 371 if (len % 8) 372 mask->s6_addr8[i] = (0xff00 >> (len % 8)) & 0xff; 373 } 374 375 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 376 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 377 378 int 379 in6_control(struct socket *so, u_long cmd, caddr_t data, 380 struct ifnet *ifp, struct thread *td) 381 { 382 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 383 struct in6_ifaddr *ia = NULL; 384 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 385 int privileged; 386 int error; 387 388 privileged = 0; 389 if (priv_check(td, PRIV_ROOT) == 0) 390 privileged++; 391 392 switch (cmd) { 393 case SIOCGETSGCNT_IN6: 394 case SIOCGETMIFCNT_IN6: 395 return (mrt6_ioctl(cmd, data)); 396 } 397 398 switch(cmd) { 399 case SIOCAADDRCTL_POLICY: 400 case SIOCDADDRCTL_POLICY: 401 if (!privileged) 402 return (EPERM); 403 return (in6_src_ioctl(cmd, data)); 404 } 405 406 if (ifp == NULL) 407 return (EOPNOTSUPP); 408 409 switch (cmd) { 410 case SIOCSNDFLUSH_IN6: 411 case SIOCSPFXFLUSH_IN6: 412 case SIOCSRTRFLUSH_IN6: 413 case SIOCSDEFIFACE_IN6: 414 case SIOCSIFINFO_FLAGS: 415 if (!privileged) 416 return (EPERM); 417 /* fall through */ 418 case OSIOCGIFINFO_IN6: 419 case SIOCGIFINFO_IN6: 420 case SIOCGDRLST_IN6: 421 case SIOCGPRLST_IN6: 422 case SIOCGNBRINFO_IN6: 423 case SIOCGDEFIFACE_IN6: 424 return (nd6_ioctl(cmd, data, ifp)); 425 } 426 427 switch (cmd) { 428 case SIOCSIFPREFIX_IN6: 429 case SIOCDIFPREFIX_IN6: 430 case SIOCAIFPREFIX_IN6: 431 case SIOCCIFPREFIX_IN6: 432 case SIOCSGIFPREFIX_IN6: 433 case SIOCGIFPREFIX_IN6: 434 log(LOG_NOTICE, 435 "prefix ioctls are now invalidated. " 436 "please use ifconfig.\n"); 437 return (EOPNOTSUPP); 438 } 439 440 switch (cmd) { 441 case SIOCSSCOPE6: 442 if (!privileged) 443 return (EPERM); 444 return (scope6_set(ifp, 445 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 446 break; 447 case SIOCGSCOPE6: 448 return (scope6_get(ifp, 449 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 450 break; 451 case SIOCGSCOPE6DEF: 452 return (scope6_get_default((struct scope6_id *) 453 ifr->ifr_ifru.ifru_scope_id)); 454 break; 455 } 456 457 switch (cmd) { 458 case SIOCALIFADDR: 459 case SIOCDLIFADDR: 460 if (!privileged) 461 return (EPERM); 462 /* fall through */ 463 case SIOCGLIFADDR: 464 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 465 } 466 467 /* 468 * Find address for this interface, if it exists. 469 */ 470 if (ifra->ifra_addr.sin6_family == AF_INET6) { /* XXX */ 471 struct sockaddr_in6 *sa6 = 472 (struct sockaddr_in6 *)&ifra->ifra_addr; 473 474 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) { 475 if (sa6->sin6_addr.s6_addr16[1] == 0) { 476 /* link ID is not embedded by the user */ 477 sa6->sin6_addr.s6_addr16[1] = 478 htons(ifp->if_index); 479 } else if (sa6->sin6_addr.s6_addr16[1] != 480 htons(ifp->if_index)) { 481 return (EINVAL); /* link ID contradicts */ 482 } 483 if (sa6->sin6_scope_id) { 484 if (sa6->sin6_scope_id != 485 (u_int32_t)ifp->if_index) 486 return (EINVAL); 487 sa6->sin6_scope_id = 0; /* XXX: good way? */ 488 } 489 } 490 ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr); 491 } 492 493 switch (cmd) { 494 case SIOCSIFADDR_IN6: 495 case SIOCSIFDSTADDR_IN6: 496 case SIOCSIFNETMASK_IN6: 497 /* 498 * Since IPv6 allows a node to assign multiple addresses 499 * on a single interface, SIOCSIFxxx ioctls are not suitable 500 * and should be unused. 501 */ 502 /* we decided to obsolete this command (20000704) */ 503 return (EINVAL); 504 505 case SIOCDIFADDR_IN6: 506 /* 507 * for IPv4, we look for existing in_ifaddr here to allow 508 * "ifconfig if0 delete" to remove first IPv4 address on the 509 * interface. For IPv6, as the spec allow multiple interface 510 * address from the day one, we consider "remove the first one" 511 * semantics to be not preferable. 512 */ 513 if (ia == NULL) 514 return (EADDRNOTAVAIL); 515 /* FALLTHROUGH */ 516 case SIOCAIFADDR_IN6: 517 /* 518 * We always require users to specify a valid IPv6 address for 519 * the corresponding operation. 520 */ 521 if (ifra->ifra_addr.sin6_family != AF_INET6 || 522 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) 523 return (EAFNOSUPPORT); 524 if (!privileged) 525 return (EPERM); 526 527 break; 528 529 case SIOCGIFADDR_IN6: 530 /* This interface is basically deprecated. use SIOCGIFCONF. */ 531 /* fall through */ 532 case SIOCGIFAFLAG_IN6: 533 case SIOCGIFNETMASK_IN6: 534 case SIOCGIFDSTADDR_IN6: 535 case SIOCGIFALIFETIME_IN6: 536 /* must think again about its semantics */ 537 if (ia == NULL) 538 return (EADDRNOTAVAIL); 539 break; 540 case SIOCSIFALIFETIME_IN6: 541 { 542 struct in6_addrlifetime *lt; 543 544 if (!privileged) 545 return (EPERM); 546 if (ia == NULL) 547 return (EADDRNOTAVAIL); 548 /* sanity for overflow - beware unsigned */ 549 lt = &ifr->ifr_ifru.ifru_lifetime; 550 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME 551 && lt->ia6t_vltime + time_second < time_second) { 552 return EINVAL; 553 } 554 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME 555 && lt->ia6t_pltime + time_second < time_second) { 556 return EINVAL; 557 } 558 break; 559 } 560 } 561 562 switch (cmd) { 563 564 case SIOCGIFADDR_IN6: 565 ifr->ifr_addr = ia->ia_addr; 566 break; 567 568 case SIOCGIFDSTADDR_IN6: 569 if (!(ifp->if_flags & IFF_POINTOPOINT)) 570 return (EINVAL); 571 /* 572 * XXX: should we check if ifa_dstaddr is NULL and return 573 * an error? 574 */ 575 ifr->ifr_dstaddr = ia->ia_dstaddr; 576 break; 577 578 case SIOCGIFNETMASK_IN6: 579 ifr->ifr_addr = ia->ia_prefixmask; 580 break; 581 582 case SIOCGIFAFLAG_IN6: 583 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 584 break; 585 586 case SIOCGIFSTAT_IN6: 587 if (ifp == NULL) 588 return EINVAL; 589 bzero(&ifr->ifr_ifru.ifru_stat, 590 sizeof(ifr->ifr_ifru.ifru_stat)); 591 ifr->ifr_ifru.ifru_stat = 592 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat; 593 break; 594 595 case SIOCGIFSTAT_ICMP6: 596 bzero(&ifr->ifr_ifru.ifru_stat, 597 sizeof(ifr->ifr_ifru.ifru_icmp6stat)); 598 ifr->ifr_ifru.ifru_icmp6stat = 599 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat; 600 break; 601 602 case SIOCGIFALIFETIME_IN6: 603 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 604 break; 605 606 case SIOCSIFALIFETIME_IN6: 607 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; 608 /* for sanity */ 609 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 610 ia->ia6_lifetime.ia6t_expire = 611 time_second + ia->ia6_lifetime.ia6t_vltime; 612 } else 613 ia->ia6_lifetime.ia6t_expire = 0; 614 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 615 ia->ia6_lifetime.ia6t_preferred = 616 time_second + ia->ia6_lifetime.ia6t_pltime; 617 } else 618 ia->ia6_lifetime.ia6t_preferred = 0; 619 break; 620 621 case SIOCAIFADDR_IN6: 622 { 623 int i, error = 0, iaIsNew; 624 struct nd_prefix pr0, *pr; 625 626 if (ia != NULL) 627 iaIsNew = 0; 628 else 629 iaIsNew = 1; 630 631 /* 632 * first, make or update the interface address structure, 633 * and link it to the list. 634 */ 635 if ((error = in6_update_ifa(ifp, ifra, ia)) != 0) 636 return (error); 637 638 /* 639 * then, make the prefix on-link on the interface. 640 * XXX: we'd rather create the prefix before the address, but 641 * we need at least one address to install the corresponding 642 * interface route, so we configure the address first. 643 */ 644 645 /* 646 * convert mask to prefix length (prefixmask has already 647 * been validated in in6_update_ifa(). 648 */ 649 bzero(&pr0, sizeof(pr0)); 650 pr0.ndpr_ifp = ifp; 651 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 652 NULL); 653 if (pr0.ndpr_plen == 128) 654 break; /* we don't need to install a host route. */ 655 pr0.ndpr_prefix = ifra->ifra_addr; 656 pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr; 657 /* apply the mask for safety. */ 658 for (i = 0; i < 4; i++) { 659 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 660 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i]; 661 } 662 /* 663 * XXX: since we don't have an API to set prefix (not address) 664 * lifetimes, we just use the same lifetimes as addresses. 665 * The (temporarily) installed lifetimes can be overridden by 666 * later advertised RAs (when accept_rtadv is non 0), which is 667 * an intended behavior. 668 */ 669 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 670 pr0.ndpr_raf_auto = 671 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 672 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 673 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 674 675 /* add the prefix if there's one. */ 676 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 677 /* 678 * nd6_prelist_add will install the corresponding 679 * interface route. 680 */ 681 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) 682 return (error); 683 if (pr == NULL) { 684 log(LOG_ERR, "nd6_prelist_add succeeded but " 685 "no prefix\n"); 686 return (EINVAL); /* XXX panic here? */ 687 } 688 } 689 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 690 == NULL) { 691 /* XXX: this should not happen! */ 692 log(LOG_ERR, "in6_control: addition succeeded, but" 693 " no ifaddr\n"); 694 } else { 695 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 696 ia->ia6_ndpr == NULL) { /* new autoconfed addr */ 697 ia->ia6_ndpr = pr; 698 pr->ndpr_refcnt++; 699 700 /* 701 * If this is the first autoconf address from 702 * the prefix, create a temporary address 703 * as well (when specified). 704 */ 705 if (ip6_use_tempaddr && 706 pr->ndpr_refcnt == 1) { 707 int e; 708 if ((e = in6_tmpifadd(ia, 1)) != 0) { 709 log(LOG_NOTICE, "in6_control: " 710 "failed to create a " 711 "temporary address, " 712 "errno=%d\n", 713 e); 714 } 715 } 716 } 717 718 /* 719 * this might affect the status of autoconfigured 720 * addresses, that is, this address might make 721 * other addresses detached. 722 */ 723 pfxlist_onlink_check(); 724 } 725 if (error == 0 && ia) { 726 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 727 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 728 &ia->ia_ifa); 729 } 730 break; 731 } 732 733 case SIOCDIFADDR_IN6: 734 { 735 int i = 0; 736 struct nd_prefix pr0, *pr; 737 738 /* 739 * If the address being deleted is the only one that owns 740 * the corresponding prefix, expire the prefix as well. 741 * XXX: theoretically, we don't have to warry about such 742 * relationship, since we separate the address management 743 * and the prefix management. We do this, however, to provide 744 * as much backward compatibility as possible in terms of 745 * the ioctl operation. 746 */ 747 bzero(&pr0, sizeof(pr0)); 748 pr0.ndpr_ifp = ifp; 749 pr0.ndpr_plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, 750 NULL); 751 if (pr0.ndpr_plen == 128) 752 goto purgeaddr; 753 pr0.ndpr_prefix = ia->ia_addr; 754 pr0.ndpr_mask = ia->ia_prefixmask.sin6_addr; 755 for (i = 0; i < 4; i++) { 756 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 757 ia->ia_prefixmask.sin6_addr.s6_addr32[i]; 758 } 759 /* 760 * The logic of the following condition is a bit complicated. 761 * We expire the prefix when 762 * 1. the address obeys autoconfiguration and it is the 763 * only owner of the associated prefix, or 764 * 2. the address does not obey autoconf and there is no 765 * other owner of the prefix. 766 */ 767 if ((pr = nd6_prefix_lookup(&pr0)) != NULL && 768 (((ia->ia6_flags & IN6_IFF_AUTOCONF) && 769 pr->ndpr_refcnt == 1) || 770 (!(ia->ia6_flags & IN6_IFF_AUTOCONF) && 771 pr->ndpr_refcnt == 0))) { 772 pr->ndpr_expire = 1; /* XXX: just for expiration */ 773 } 774 775 purgeaddr: 776 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE, 777 &ia->ia_ifa); 778 in6_purgeaddr(&ia->ia_ifa); 779 break; 780 } 781 782 default: 783 if (ifp == NULL || ifp->if_ioctl == 0) 784 return (EOPNOTSUPP); 785 ifnet_serialize_all(ifp); 786 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred); 787 ifnet_deserialize_all(ifp); 788 return (error); 789 } 790 791 return (0); 792 } 793 794 /* 795 * Update parameters of an IPv6 interface address. 796 * If necessary, a new entry is created and linked into address chains. 797 * This function is separated from in6_control(). 798 * XXX: should this be performed under splnet()? 799 */ 800 int 801 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 802 struct in6_ifaddr *ia) 803 { 804 int error = 0, hostIsNew = 0, plen = -1; 805 struct in6_ifaddr *oia; 806 struct sockaddr_in6 dst6; 807 struct in6_addrlifetime *lt; 808 809 /* Validate parameters */ 810 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 811 return (EINVAL); 812 813 /* 814 * The destination address for a p2p link must have a family 815 * of AF_UNSPEC or AF_INET6. 816 */ 817 if ((ifp->if_flags & IFF_POINTOPOINT) && 818 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 819 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 820 return (EAFNOSUPPORT); 821 /* 822 * validate ifra_prefixmask. don't check sin6_family, netmask 823 * does not carry fields other than sin6_len. 824 */ 825 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 826 return (EINVAL); 827 /* 828 * Because the IPv6 address architecture is classless, we require 829 * users to specify a (non 0) prefix length (mask) for a new address. 830 * We also require the prefix (when specified) mask is valid, and thus 831 * reject a non-consecutive mask. 832 */ 833 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 834 return (EINVAL); 835 if (ifra->ifra_prefixmask.sin6_len != 0) { 836 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 837 (u_char *)&ifra->ifra_prefixmask + 838 ifra->ifra_prefixmask.sin6_len); 839 if (plen <= 0) 840 return (EINVAL); 841 } 842 else { 843 /* 844 * In this case, ia must not be NULL. We just use its prefix 845 * length. 846 */ 847 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 848 } 849 /* 850 * If the destination address on a p2p interface is specified, 851 * and the address is a scoped one, validate/set the scope 852 * zone identifier. 853 */ 854 dst6 = ifra->ifra_dstaddr; 855 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) && 856 (dst6.sin6_family == AF_INET6)) { 857 int scopeid; 858 859 if ((error = in6_recoverscope(&dst6, 860 &ifra->ifra_dstaddr.sin6_addr, 861 ifp)) != 0) 862 return (error); 863 scopeid = in6_addr2scopeid(ifp, &dst6.sin6_addr); 864 if (dst6.sin6_scope_id == 0) /* user omit to specify the ID. */ 865 dst6.sin6_scope_id = scopeid; 866 else if (dst6.sin6_scope_id != scopeid) 867 return (EINVAL); /* scope ID mismatch. */ 868 if ((error = in6_embedscope(&dst6.sin6_addr, &dst6, NULL, NULL)) 869 != 0) 870 return (error); 871 dst6.sin6_scope_id = 0; /* XXX */ 872 } 873 /* 874 * The destination address can be specified only for a p2p or a 875 * loopback interface. If specified, the corresponding prefix length 876 * must be 128. 877 */ 878 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 879 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0) { 880 /* XXX: noisy message */ 881 log(LOG_INFO, "in6_update_ifa: a destination can be " 882 "specified for a p2p or a loopback IF only\n"); 883 return (EINVAL); 884 } 885 if (plen != 128) { 886 /* 887 * The following message seems noisy, but we dare to 888 * add it for diagnosis. 889 */ 890 log(LOG_INFO, "in6_update_ifa: prefixlen must be 128 " 891 "when dstaddr is specified\n"); 892 return (EINVAL); 893 } 894 } 895 /* lifetime consistency check */ 896 lt = &ifra->ifra_lifetime; 897 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME 898 && lt->ia6t_vltime + time_second < time_second) { 899 return EINVAL; 900 } 901 if (lt->ia6t_vltime == 0) { 902 /* 903 * the following log might be noisy, but this is a typical 904 * configuration mistake or a tool's bug. 905 */ 906 log(LOG_INFO, 907 "in6_update_ifa: valid lifetime is 0 for %s\n", 908 ip6_sprintf(&ifra->ifra_addr.sin6_addr)); 909 } 910 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME 911 && lt->ia6t_pltime + time_second < time_second) { 912 return EINVAL; 913 } 914 915 /* 916 * If this is a new address, allocate a new ifaddr and link it 917 * into chains. 918 */ 919 if (ia == NULL) { 920 hostIsNew = 1; 921 /* 922 * When in6_update_ifa() is called in a process of a received 923 * RA, it is called under splnet(). So, we should call malloc 924 * with M_NOWAIT. 925 */ 926 ia = ifa_create(sizeof(*ia), M_NOWAIT); 927 if (ia == NULL) 928 return (ENOBUFS); 929 /* Initialize the address and masks */ 930 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 931 ia->ia_addr.sin6_family = AF_INET6; 932 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 933 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 934 /* 935 * XXX: some functions expect that ifa_dstaddr is not 936 * NULL for p2p interfaces. 937 */ 938 ia->ia_ifa.ifa_dstaddr 939 = (struct sockaddr *)&ia->ia_dstaddr; 940 } else { 941 ia->ia_ifa.ifa_dstaddr = NULL; 942 } 943 ia->ia_ifa.ifa_netmask 944 = (struct sockaddr *)&ia->ia_prefixmask; 945 946 ia->ia_ifp = ifp; 947 if ((oia = in6_ifaddr) != NULL) { 948 for ( ; oia->ia_next; oia = oia->ia_next) 949 continue; 950 oia->ia_next = ia; 951 } else 952 in6_ifaddr = ia; 953 954 ifa_iflink(&ia->ia_ifa, ifp, 1); 955 } 956 957 /* set prefix mask */ 958 if (ifra->ifra_prefixmask.sin6_len) { 959 /* 960 * We prohibit changing the prefix length of an existing 961 * address, because 962 * + such an operation should be rare in IPv6, and 963 * + the operation would confuse prefix management. 964 */ 965 if (ia->ia_prefixmask.sin6_len && 966 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 967 log(LOG_INFO, "in6_update_ifa: the prefix length of an" 968 " existing (%s) address should not be changed\n", 969 ip6_sprintf(&ia->ia_addr.sin6_addr)); 970 error = EINVAL; 971 goto unlink; 972 } 973 ia->ia_prefixmask = ifra->ifra_prefixmask; 974 } 975 976 /* 977 * If a new destination address is specified, scrub the old one and 978 * install the new destination. Note that the interface must be 979 * p2p or loopback (see the check above.) 980 */ 981 if (dst6.sin6_family == AF_INET6 && 982 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, 983 &ia->ia_dstaddr.sin6_addr)) { 984 int e; 985 986 if ((ia->ia_flags & IFA_ROUTE) && 987 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 988 != 0) { 989 log(LOG_ERR, "in6_update_ifa: failed to remove " 990 "a route to the old destination: %s\n", 991 ip6_sprintf(&ia->ia_addr.sin6_addr)); 992 /* proceed anyway... */ 993 } 994 else 995 ia->ia_flags &= ~IFA_ROUTE; 996 ia->ia_dstaddr = dst6; 997 } 998 999 /* reset the interface and routing table appropriately. */ 1000 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 1001 goto unlink; 1002 1003 /* 1004 * Beyond this point, we should call in6_purgeaddr upon an error, 1005 * not just go to unlink. 1006 */ 1007 1008 #if 0 /* disable this mechanism for now */ 1009 /* update prefix list */ 1010 if (hostIsNew && 1011 (ifra->ifra_flags & IN6_IFF_NOPFX) == 0) { /* XXX */ 1012 int iilen; 1013 1014 iilen = (sizeof(ia->ia_prefixmask.sin6_addr) << 3) - plen; 1015 if ((error = in6_prefix_add_ifid(iilen, ia)) != 0) { 1016 in6_purgeaddr((struct ifaddr *)ia); 1017 return (error); 1018 } 1019 } 1020 #endif 1021 1022 if (ifp->if_flags & IFF_MULTICAST) { 1023 struct sockaddr_in6 mltaddr, mltmask; 1024 struct in6_multi *in6m; 1025 1026 if (hostIsNew) { 1027 /* 1028 * join solicited multicast addr for new host id 1029 */ 1030 struct in6_addr llsol; 1031 bzero(&llsol, sizeof(struct in6_addr)); 1032 llsol.s6_addr16[0] = htons(0xff02); 1033 llsol.s6_addr16[1] = htons(ifp->if_index); 1034 llsol.s6_addr32[1] = 0; 1035 llsol.s6_addr32[2] = htonl(1); 1036 llsol.s6_addr32[3] = 1037 ifra->ifra_addr.sin6_addr.s6_addr32[3]; 1038 llsol.s6_addr8[12] = 0xff; 1039 in6_addmulti(&llsol, ifp, &error); 1040 if (error != 0) { 1041 log(LOG_WARNING, 1042 "in6_update_ifa: addmulti failed for " 1043 "%s on %s (errno=%d)\n", 1044 ip6_sprintf(&llsol), if_name(ifp), 1045 error); 1046 in6_purgeaddr((struct ifaddr *)ia); 1047 return (error); 1048 } 1049 } 1050 1051 bzero(&mltmask, sizeof(mltmask)); 1052 mltmask.sin6_len = sizeof(struct sockaddr_in6); 1053 mltmask.sin6_family = AF_INET6; 1054 mltmask.sin6_addr = in6mask32; 1055 1056 /* 1057 * join link-local all-nodes address 1058 */ 1059 bzero(&mltaddr, sizeof(mltaddr)); 1060 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 1061 mltaddr.sin6_family = AF_INET6; 1062 mltaddr.sin6_addr = kin6addr_linklocal_allnodes; 1063 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1064 1065 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1066 if (in6m == NULL) { 1067 rtrequest_global(RTM_ADD, 1068 (struct sockaddr *)&mltaddr, 1069 (struct sockaddr *)&ia->ia_addr, 1070 (struct sockaddr *)&mltmask, 1071 RTF_UP|RTF_CLONING); /* xxx */ 1072 in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 1073 if (error != 0) { 1074 log(LOG_WARNING, 1075 "in6_update_ifa: addmulti failed for " 1076 "%s on %s (errno=%d)\n", 1077 ip6_sprintf(&mltaddr.sin6_addr), 1078 if_name(ifp), error); 1079 } 1080 } 1081 1082 /* 1083 * join node information group address 1084 */ 1085 #define hostnamelen strlen(hostname) 1086 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr.sin6_addr) 1087 == 0) { 1088 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1089 if (in6m == NULL && ia != NULL) { 1090 in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 1091 if (error != 0) { 1092 log(LOG_WARNING, "in6_update_ifa: " 1093 "addmulti failed for " 1094 "%s on %s (errno=%d)\n", 1095 ip6_sprintf(&mltaddr.sin6_addr), 1096 if_name(ifp), error); 1097 } 1098 } 1099 } 1100 #undef hostnamelen 1101 1102 /* 1103 * join node-local all-nodes address, on loopback. 1104 * XXX: since "node-local" is obsoleted by interface-local, 1105 * we have to join the group on every interface with 1106 * some interface-boundary restriction. 1107 */ 1108 if (ifp->if_flags & IFF_LOOPBACK) { 1109 struct in6_ifaddr *ia_loop; 1110 1111 struct in6_addr loop6 = kin6addr_loopback; 1112 ia_loop = in6ifa_ifpwithaddr(ifp, &loop6); 1113 1114 mltaddr.sin6_addr = kin6addr_nodelocal_allnodes; 1115 1116 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1117 if (in6m == NULL && ia_loop != NULL) { 1118 rtrequest_global(RTM_ADD, 1119 (struct sockaddr *)&mltaddr, 1120 (struct sockaddr *)&ia_loop->ia_addr, 1121 (struct sockaddr *)&mltmask, 1122 RTF_UP); 1123 in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 1124 if (error != 0) { 1125 log(LOG_WARNING, "in6_update_ifa: " 1126 "addmulti failed for %s on %s " 1127 "(errno=%d)\n", 1128 ip6_sprintf(&mltaddr.sin6_addr), 1129 if_name(ifp), error); 1130 } 1131 } 1132 } 1133 } 1134 1135 ia->ia6_flags = ifra->ifra_flags; 1136 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /*safety*/ 1137 ia->ia6_flags &= ~IN6_IFF_NODAD; /* Mobile IPv6 */ 1138 1139 ia->ia6_lifetime = ifra->ifra_lifetime; 1140 /* for sanity */ 1141 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1142 ia->ia6_lifetime.ia6t_expire = 1143 time_second + ia->ia6_lifetime.ia6t_vltime; 1144 } else 1145 ia->ia6_lifetime.ia6t_expire = 0; 1146 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1147 ia->ia6_lifetime.ia6t_preferred = 1148 time_second + ia->ia6_lifetime.ia6t_pltime; 1149 } else 1150 ia->ia6_lifetime.ia6t_preferred = 0; 1151 1152 /* 1153 * Perform DAD, if needed. 1154 * XXX It may be of use, if we can administratively 1155 * disable DAD. 1156 */ 1157 if (in6if_do_dad(ifp) && !(ifra->ifra_flags & IN6_IFF_NODAD)) { 1158 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1159 nd6_dad_start((struct ifaddr *)ia, NULL); 1160 } 1161 1162 return (error); 1163 1164 unlink: 1165 /* 1166 * XXX: if a change of an existing address failed, keep the entry 1167 * anyway. 1168 */ 1169 if (hostIsNew) 1170 in6_unlink_ifa(ia, ifp); 1171 return (error); 1172 } 1173 1174 void 1175 in6_purgeaddr(struct ifaddr *ifa) 1176 { 1177 struct ifnet *ifp = ifa->ifa_ifp; 1178 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1179 1180 /* stop DAD processing */ 1181 nd6_dad_stop(ifa); 1182 1183 /* 1184 * delete route to the destination of the address being purged. 1185 * The interface must be p2p or loopback in this case. 1186 */ 1187 if ((ia->ia_flags & IFA_ROUTE) && ia->ia_dstaddr.sin6_len != 0) { 1188 int e; 1189 1190 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 1191 != 0) { 1192 log(LOG_ERR, "in6_purgeaddr: failed to remove " 1193 "a route to the p2p destination: %s on %s, " 1194 "errno=%d\n", 1195 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp), 1196 e); 1197 /* proceed anyway... */ 1198 } 1199 else 1200 ia->ia_flags &= ~IFA_ROUTE; 1201 } 1202 1203 /* Remove ownaddr's loopback rtentry, if it exists. */ 1204 in6_ifremloop(&(ia->ia_ifa)); 1205 1206 if (ifp->if_flags & IFF_MULTICAST) { 1207 /* 1208 * delete solicited multicast addr for deleting host id 1209 */ 1210 struct in6_multi *in6m; 1211 struct in6_addr llsol; 1212 bzero(&llsol, sizeof(struct in6_addr)); 1213 llsol.s6_addr16[0] = htons(0xff02); 1214 llsol.s6_addr16[1] = htons(ifp->if_index); 1215 llsol.s6_addr32[1] = 0; 1216 llsol.s6_addr32[2] = htonl(1); 1217 llsol.s6_addr32[3] = 1218 ia->ia_addr.sin6_addr.s6_addr32[3]; 1219 llsol.s6_addr8[12] = 0xff; 1220 1221 IN6_LOOKUP_MULTI(llsol, ifp, in6m); 1222 if (in6m) 1223 in6_delmulti(in6m); 1224 } 1225 1226 in6_unlink_ifa(ia, ifp); 1227 } 1228 1229 static void 1230 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1231 { 1232 int plen, iilen; 1233 struct in6_ifaddr *oia; 1234 1235 crit_enter(); 1236 1237 ifa_ifunlink(&ia->ia_ifa, ifp); 1238 1239 oia = ia; 1240 if (oia == (ia = in6_ifaddr)) 1241 in6_ifaddr = ia->ia_next; 1242 else { 1243 while (ia->ia_next && (ia->ia_next != oia)) 1244 ia = ia->ia_next; 1245 if (ia->ia_next) 1246 ia->ia_next = oia->ia_next; 1247 else { 1248 /* search failed */ 1249 kprintf("Couldn't unlink in6_ifaddr from in6_ifaddr\n"); 1250 } 1251 } 1252 1253 if (oia->ia6_ifpr) { /* check for safety */ 1254 plen = in6_mask2len(&oia->ia_prefixmask.sin6_addr, NULL); 1255 iilen = (sizeof(oia->ia_prefixmask.sin6_addr) << 3) - plen; 1256 in6_prefix_remove_ifid(iilen, oia); 1257 } 1258 1259 /* 1260 * When an autoconfigured address is being removed, release the 1261 * reference to the base prefix. Also, since the release might 1262 * affect the status of other (detached) addresses, call 1263 * pfxlist_onlink_check(). 1264 */ 1265 if (oia->ia6_flags & IN6_IFF_AUTOCONF) { 1266 if (oia->ia6_ndpr == NULL) { 1267 log(LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address " 1268 "%p has no prefix\n", oia); 1269 } else { 1270 oia->ia6_ndpr->ndpr_refcnt--; 1271 oia->ia6_flags &= ~IN6_IFF_AUTOCONF; 1272 oia->ia6_ndpr = NULL; 1273 } 1274 1275 pfxlist_onlink_check(); 1276 } 1277 1278 /* 1279 * release another refcnt for the link from in6_ifaddr. 1280 * Note that we should decrement the refcnt at least once for all *BSD. 1281 */ 1282 ifa_destroy(&oia->ia_ifa); 1283 1284 crit_exit(); 1285 } 1286 1287 void 1288 in6_purgeif(struct ifnet *ifp) 1289 { 1290 struct ifaddr_container *ifac, *next; 1291 1292 TAILQ_FOREACH_MUTABLE(ifac, &ifp->if_addrheads[mycpuid], 1293 ifa_link, next) { 1294 if (ifac->ifa->ifa_addr->sa_family != AF_INET6) 1295 continue; 1296 in6_purgeaddr(ifac->ifa); 1297 } 1298 1299 in6_ifdetach(ifp); 1300 } 1301 1302 /* 1303 * SIOC[GAD]LIFADDR. 1304 * SIOCGLIFADDR: get first address. (?) 1305 * SIOCGLIFADDR with IFLR_PREFIX: 1306 * get first address that matches the specified prefix. 1307 * SIOCALIFADDR: add the specified address. 1308 * SIOCALIFADDR with IFLR_PREFIX: 1309 * add the specified prefix, filling hostid part from 1310 * the first link-local address. prefixlen must be <= 64. 1311 * SIOCDLIFADDR: delete the specified address. 1312 * SIOCDLIFADDR with IFLR_PREFIX: 1313 * delete the first address that matches the specified prefix. 1314 * return values: 1315 * EINVAL on invalid parameters 1316 * EADDRNOTAVAIL on prefix match failed/specified address not found 1317 * other values may be returned from in6_ioctl() 1318 * 1319 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1320 * this is to accomodate address naming scheme other than RFC2374, 1321 * in the future. 1322 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1323 * address encoding scheme. (see figure on page 8) 1324 */ 1325 static int 1326 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 1327 struct ifnet *ifp, struct thread *td) 1328 { 1329 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1330 struct sockaddr *sa; 1331 1332 /* sanity checks */ 1333 if (!data || !ifp) { 1334 panic("invalid argument to in6_lifaddr_ioctl"); 1335 /*NOTRECHED*/ 1336 } 1337 1338 switch (cmd) { 1339 case SIOCGLIFADDR: 1340 /* address must be specified on GET with IFLR_PREFIX */ 1341 if (!(iflr->flags & IFLR_PREFIX)) 1342 break; 1343 /* FALLTHROUGH */ 1344 case SIOCALIFADDR: 1345 case SIOCDLIFADDR: 1346 /* address must be specified on ADD and DELETE */ 1347 sa = (struct sockaddr *)&iflr->addr; 1348 if (sa->sa_family != AF_INET6) 1349 return EINVAL; 1350 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1351 return EINVAL; 1352 /* XXX need improvement */ 1353 sa = (struct sockaddr *)&iflr->dstaddr; 1354 if (sa->sa_family && sa->sa_family != AF_INET6) 1355 return EINVAL; 1356 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1357 return EINVAL; 1358 break; 1359 default: /* shouldn't happen */ 1360 #if 0 1361 panic("invalid cmd to in6_lifaddr_ioctl"); 1362 /* NOTREACHED */ 1363 #else 1364 return EOPNOTSUPP; 1365 #endif 1366 } 1367 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) 1368 return EINVAL; 1369 1370 switch (cmd) { 1371 case SIOCALIFADDR: 1372 { 1373 struct in6_aliasreq ifra; 1374 struct in6_addr *hostid = NULL; 1375 int prefixlen; 1376 1377 if (iflr->flags & IFLR_PREFIX) { 1378 struct ifaddr *ifa; 1379 struct sockaddr_in6 *sin6; 1380 1381 /* 1382 * hostid is to fill in the hostid part of the 1383 * address. hostid points to the first link-local 1384 * address attached to the interface. 1385 */ 1386 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1387 if (!ifa) 1388 return EADDRNOTAVAIL; 1389 hostid = IFA_IN6(ifa); 1390 1391 /* prefixlen must be <= 64. */ 1392 if (64 < iflr->prefixlen) 1393 return EINVAL; 1394 prefixlen = iflr->prefixlen; 1395 1396 /* hostid part must be zero. */ 1397 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1398 if (sin6->sin6_addr.s6_addr32[2] != 0 1399 || sin6->sin6_addr.s6_addr32[3] != 0) { 1400 return EINVAL; 1401 } 1402 } else 1403 prefixlen = iflr->prefixlen; 1404 1405 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1406 bzero(&ifra, sizeof(ifra)); 1407 bcopy(iflr->iflr_name, ifra.ifra_name, 1408 sizeof(ifra.ifra_name)); 1409 1410 bcopy(&iflr->addr, &ifra.ifra_addr, 1411 ((struct sockaddr *)&iflr->addr)->sa_len); 1412 if (hostid) { 1413 /* fill in hostid part */ 1414 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1415 hostid->s6_addr32[2]; 1416 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1417 hostid->s6_addr32[3]; 1418 } 1419 1420 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/ 1421 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1422 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1423 if (hostid) { 1424 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1425 hostid->s6_addr32[2]; 1426 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1427 hostid->s6_addr32[3]; 1428 } 1429 } 1430 1431 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1432 in6_len2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1433 1434 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1435 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td); 1436 } 1437 case SIOCGLIFADDR: 1438 case SIOCDLIFADDR: 1439 { 1440 struct ifaddr_container *ifac; 1441 struct in6_ifaddr *ia; 1442 struct in6_addr mask, candidate, match; 1443 struct sockaddr_in6 *sin6; 1444 int cmp; 1445 1446 bzero(&mask, sizeof(mask)); 1447 if (iflr->flags & IFLR_PREFIX) { 1448 /* lookup a prefix rather than address. */ 1449 in6_len2mask(&mask, iflr->prefixlen); 1450 1451 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1452 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1453 match.s6_addr32[0] &= mask.s6_addr32[0]; 1454 match.s6_addr32[1] &= mask.s6_addr32[1]; 1455 match.s6_addr32[2] &= mask.s6_addr32[2]; 1456 match.s6_addr32[3] &= mask.s6_addr32[3]; 1457 1458 /* if you set extra bits, that's wrong */ 1459 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1460 return EINVAL; 1461 1462 cmp = 1; 1463 } else { 1464 if (cmd == SIOCGLIFADDR) { 1465 /* on getting an address, take the 1st match */ 1466 cmp = 0; /* XXX */ 1467 } else { 1468 /* on deleting an address, do exact match */ 1469 in6_len2mask(&mask, 128); 1470 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1471 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1472 1473 cmp = 1; 1474 } 1475 } 1476 1477 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1478 struct ifaddr *ifa = ifac->ifa; 1479 1480 if (ifa->ifa_addr->sa_family != AF_INET6) 1481 continue; 1482 if (!cmp) 1483 break; 1484 1485 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1486 /* 1487 * XXX: this is adhoc, but is necessary to allow 1488 * a user to specify fe80::/64 (not /10) for a 1489 * link-local address. 1490 */ 1491 if (IN6_IS_ADDR_LINKLOCAL(&candidate)) 1492 candidate.s6_addr16[1] = 0; 1493 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1494 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1495 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1496 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1497 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1498 break; 1499 } 1500 if (ifac == NULL) 1501 return EADDRNOTAVAIL; 1502 ia = ifa2ia6(ifac->ifa); 1503 1504 if (cmd == SIOCGLIFADDR) { 1505 struct sockaddr_in6 *s6; 1506 1507 /* fill in the if_laddrreq structure */ 1508 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1509 s6 = (struct sockaddr_in6 *)&iflr->addr; 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, &s6->sin6_addr); 1514 } 1515 if (ifp->if_flags & IFF_POINTOPOINT) { 1516 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1517 ia->ia_dstaddr.sin6_len); 1518 s6 = (struct sockaddr_in6 *)&iflr->dstaddr; 1519 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) { 1520 s6->sin6_addr.s6_addr16[1] = 0; 1521 s6->sin6_scope_id = 1522 in6_addr2scopeid(ifp, 1523 &s6->sin6_addr); 1524 } 1525 } else 1526 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1527 1528 iflr->prefixlen = 1529 in6_mask2len(&ia->ia_prefixmask.sin6_addr, 1530 NULL); 1531 1532 iflr->flags = ia->ia6_flags; /* XXX */ 1533 1534 return 0; 1535 } else { 1536 struct in6_aliasreq ifra; 1537 1538 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1539 bzero(&ifra, sizeof(ifra)); 1540 bcopy(iflr->iflr_name, ifra.ifra_name, 1541 sizeof(ifra.ifra_name)); 1542 1543 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1544 ia->ia_addr.sin6_len); 1545 if (ifp->if_flags & IFF_POINTOPOINT) 1546 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1547 ia->ia_dstaddr.sin6_len); 1548 else 1549 bzero(&ifra.ifra_dstaddr, 1550 sizeof(ifra.ifra_dstaddr)); 1551 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1552 ia->ia_prefixmask.sin6_len); 1553 1554 ifra.ifra_flags = ia->ia6_flags; 1555 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, 1556 ifp, td); 1557 } 1558 } 1559 } 1560 1561 return EOPNOTSUPP; /* just for safety */ 1562 } 1563 1564 /* 1565 * Initialize an interface's intetnet6 address 1566 * and routing table entry. 1567 */ 1568 static int 1569 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, struct sockaddr_in6 *sin6, 1570 int newhost) 1571 { 1572 int error = 0, plen, ifacount = 0; 1573 struct ifaddr_container *ifac; 1574 1575 /* 1576 * Give the interface a chance to initialize 1577 * if this is its first address, 1578 * and to validate the address if necessary. 1579 */ 1580 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1581 if (ifac->ifa->ifa_addr == NULL) 1582 continue; /* just for safety */ 1583 if (ifac->ifa->ifa_addr->sa_family != AF_INET6) 1584 continue; 1585 ifacount++; 1586 } 1587 1588 ifnet_serialize_all(ifp); 1589 1590 ia->ia_addr = *sin6; 1591 1592 if (ifacount <= 1 && ifp->if_ioctl && 1593 (error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL))) { 1594 ifnet_deserialize_all(ifp); 1595 return (error); 1596 } 1597 1598 ifnet_deserialize_all(ifp); 1599 1600 ia->ia_ifa.ifa_metric = ifp->if_metric; 1601 1602 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1603 1604 /* 1605 * Special case: 1606 * If the destination address is specified for a point-to-point 1607 * interface, install a route to the destination as an interface 1608 * direct route. 1609 */ 1610 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1611 if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) { 1612 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, 1613 RTF_UP | RTF_HOST)) != 0) 1614 return (error); 1615 ia->ia_flags |= IFA_ROUTE; 1616 } 1617 if (plen < 128) { 1618 /* 1619 * The RTF_CLONING flag is necessary for in6_is_ifloop_auto(). 1620 */ 1621 ia->ia_ifa.ifa_flags |= RTF_CLONING; 1622 } 1623 1624 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1625 if (newhost) { 1626 /* set the rtrequest function to create llinfo */ 1627 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1628 in6_ifaddloop(&(ia->ia_ifa)); 1629 } 1630 1631 return (error); 1632 } 1633 1634 struct in6_multi_mship * 1635 in6_joingroup(struct ifnet *ifp, struct in6_addr *addr, int *errorp) 1636 { 1637 struct in6_multi_mship *imm; 1638 1639 imm = kmalloc(sizeof(*imm), M_IPMADDR, M_NOWAIT); 1640 if (!imm) { 1641 *errorp = ENOBUFS; 1642 return NULL; 1643 } 1644 imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp); 1645 if (!imm->i6mm_maddr) { 1646 /* *errorp is alrady set */ 1647 kfree(imm, M_IPMADDR); 1648 return NULL; 1649 } 1650 return imm; 1651 } 1652 1653 int 1654 in6_leavegroup(struct in6_multi_mship *imm) 1655 { 1656 1657 if (imm->i6mm_maddr) 1658 in6_delmulti(imm->i6mm_maddr); 1659 kfree(imm, M_IPMADDR); 1660 return 0; 1661 } 1662 1663 /* 1664 * Add an address to the list of IP6 multicast addresses for a 1665 * given interface. 1666 */ 1667 struct in6_multi * 1668 in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp, int *errorp) 1669 { 1670 struct in6_multi *in6m; 1671 struct sockaddr_in6 sin6; 1672 struct ifmultiaddr *ifma; 1673 1674 *errorp = 0; 1675 1676 crit_enter(); 1677 1678 /* 1679 * Call generic routine to add membership or increment 1680 * refcount. It wants addresses in the form of a sockaddr, 1681 * so we build one here (being careful to zero the unused bytes). 1682 */ 1683 bzero(&sin6, sizeof sin6); 1684 sin6.sin6_family = AF_INET6; 1685 sin6.sin6_len = sizeof sin6; 1686 sin6.sin6_addr = *maddr6; 1687 *errorp = if_addmulti(ifp, (struct sockaddr *)&sin6, &ifma); 1688 if (*errorp) { 1689 crit_exit(); 1690 return 0; 1691 } 1692 1693 /* 1694 * If ifma->ifma_protospec is null, then if_addmulti() created 1695 * a new record. Otherwise, we are done. 1696 */ 1697 if (ifma->ifma_protospec != 0) { 1698 crit_exit(); 1699 return ifma->ifma_protospec; 1700 } 1701 1702 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 1703 at interrupt time? If so, need to fix if_addmulti. XXX */ 1704 in6m = (struct in6_multi *)kmalloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT); 1705 if (in6m == NULL) { 1706 crit_exit(); 1707 return (NULL); 1708 } 1709 1710 bzero(in6m, sizeof *in6m); 1711 in6m->in6m_addr = *maddr6; 1712 in6m->in6m_ifp = ifp; 1713 in6m->in6m_ifma = ifma; 1714 ifma->ifma_protospec = in6m; 1715 LIST_INSERT_HEAD(&in6_multihead, in6m, in6m_entry); 1716 1717 /* 1718 * Let MLD6 know that we have joined a new IP6 multicast 1719 * group. 1720 */ 1721 mld6_start_listening(in6m); 1722 crit_exit(); 1723 return (in6m); 1724 } 1725 1726 /* 1727 * Delete a multicast address record. 1728 */ 1729 void 1730 in6_delmulti(struct in6_multi *in6m) 1731 { 1732 struct ifmultiaddr *ifma = in6m->in6m_ifma; 1733 1734 crit_enter(); 1735 1736 if (ifma->ifma_refcount == 1) { 1737 /* 1738 * No remaining claims to this record; let MLD6 know 1739 * that we are leaving the multicast group. 1740 */ 1741 mld6_stop_listening(in6m); 1742 ifma->ifma_protospec = 0; 1743 LIST_REMOVE(in6m, in6m_entry); 1744 kfree(in6m, M_IPMADDR); 1745 } 1746 /* XXX - should be separate API for when we have an ifma? */ 1747 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1748 crit_exit(); 1749 } 1750 1751 /* 1752 * Find an IPv6 interface link-local address specific to an interface. 1753 */ 1754 struct in6_ifaddr * 1755 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1756 { 1757 struct ifaddr_container *ifac; 1758 1759 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1760 struct ifaddr *ifa = ifac->ifa; 1761 1762 if (ifa->ifa_addr == NULL) 1763 continue; /* just for safety */ 1764 if (ifa->ifa_addr->sa_family != AF_INET6) 1765 continue; 1766 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1767 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1768 ignoreflags) != 0) 1769 continue; 1770 break; 1771 } 1772 } 1773 if (ifac != NULL) 1774 return ((struct in6_ifaddr *)(ifac->ifa)); 1775 else 1776 return (NULL); 1777 } 1778 1779 1780 /* 1781 * find the internet address corresponding to a given interface and address. 1782 */ 1783 struct in6_ifaddr * 1784 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr) 1785 { 1786 struct ifaddr_container *ifac; 1787 1788 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1789 struct ifaddr *ifa = ifac->ifa; 1790 1791 if (ifa->ifa_addr == NULL) 1792 continue; /* just for safety */ 1793 if (ifa->ifa_addr->sa_family != AF_INET6) 1794 continue; 1795 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1796 break; 1797 } 1798 if (ifac != NULL) 1799 return ((struct in6_ifaddr *)(ifac->ifa)); 1800 else 1801 return (NULL); 1802 } 1803 1804 /* 1805 * find the internet address on a given interface corresponding to a neighbor's 1806 * address. 1807 */ 1808 struct in6_ifaddr * 1809 in6ifa_ifplocaladdr(const struct ifnet *ifp, const struct in6_addr *addr) 1810 { 1811 struct ifaddr *ifa; 1812 struct in6_ifaddr *ia; 1813 struct ifaddr_container *ifac; 1814 1815 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1816 ifa = ifac->ifa; 1817 1818 if (ifa->ifa_addr == NULL) 1819 continue; /* just for safety */ 1820 if (ifa->ifa_addr->sa_family != AF_INET6) 1821 continue; 1822 ia = (struct in6_ifaddr *)ifa; 1823 if (IN6_ARE_MASKED_ADDR_EQUAL(addr, 1824 &ia->ia_addr.sin6_addr, 1825 &ia->ia_prefixmask.sin6_addr)) 1826 return ia; 1827 } 1828 1829 return NULL; 1830 } 1831 1832 /* 1833 * Convert IP6 address to printable (loggable) representation. 1834 */ 1835 static char digits[] = "0123456789abcdef"; 1836 static int ip6round = 0; 1837 char * 1838 ip6_sprintf(const struct in6_addr *addr) 1839 { 1840 static char ip6buf[8][48]; 1841 int i; 1842 char *cp; 1843 const u_short *a = (const u_short *)addr; 1844 const u_char *d; 1845 int dcolon = 0; 1846 1847 ip6round = (ip6round + 1) & 7; 1848 cp = ip6buf[ip6round]; 1849 1850 for (i = 0; i < 8; i++) { 1851 if (dcolon == 1) { 1852 if (*a == 0) { 1853 if (i == 7) 1854 *cp++ = ':'; 1855 a++; 1856 continue; 1857 } else 1858 dcolon = 2; 1859 } 1860 if (*a == 0) { 1861 if (dcolon == 0 && *(a + 1) == 0) { 1862 if (i == 0) 1863 *cp++ = ':'; 1864 *cp++ = ':'; 1865 dcolon = 1; 1866 } else { 1867 *cp++ = '0'; 1868 *cp++ = ':'; 1869 } 1870 a++; 1871 continue; 1872 } 1873 d = (const u_char *)a; 1874 *cp++ = digits[*d >> 4]; 1875 *cp++ = digits[*d++ & 0xf]; 1876 *cp++ = digits[*d >> 4]; 1877 *cp++ = digits[*d & 0xf]; 1878 *cp++ = ':'; 1879 a++; 1880 } 1881 *--cp = 0; 1882 return (ip6buf[ip6round]); 1883 } 1884 1885 int 1886 in6_localaddr(struct in6_addr *in6) 1887 { 1888 struct in6_ifaddr *ia; 1889 1890 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1891 return 1; 1892 1893 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 1894 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1895 &ia->ia_prefixmask.sin6_addr)) 1896 return 1; 1897 1898 return (0); 1899 } 1900 1901 int 1902 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1903 { 1904 struct in6_ifaddr *ia; 1905 1906 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1907 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1908 &sa6->sin6_addr) && 1909 (ia->ia6_flags & IN6_IFF_DEPRECATED)) 1910 return (1); /* true */ 1911 1912 /* XXX: do we still have to go thru the rest of the list? */ 1913 } 1914 1915 return (0); /* false */ 1916 } 1917 1918 /* 1919 * return length of part which dst and src are equal 1920 * hard coding... 1921 */ 1922 int 1923 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1924 { 1925 int match = 0; 1926 u_char *s = (u_char *)src, *d = (u_char *)dst; 1927 u_char *lim = s + 16, r; 1928 1929 while (s < lim) 1930 if ((r = (*d++ ^ *s++)) != 0) { 1931 while (r < 128) { 1932 match++; 1933 r <<= 1; 1934 } 1935 break; 1936 } else 1937 match += 8; 1938 return match; 1939 } 1940 1941 /* XXX: to be scope conscious */ 1942 int 1943 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1944 { 1945 int bytelen, bitlen; 1946 1947 /* sanity check */ 1948 if (0 > len || len > 128) { 1949 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1950 len); 1951 return (0); 1952 } 1953 1954 bytelen = len / 8; 1955 bitlen = len % 8; 1956 1957 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1958 return (0); 1959 if (p1->s6_addr[bytelen] >> (8 - bitlen) != 1960 p2->s6_addr[bytelen] >> (8 - bitlen)) 1961 return (0); 1962 1963 return (1); 1964 } 1965 1966 void 1967 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1968 { 1969 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1970 int bytelen, bitlen, i; 1971 1972 /* sanity check */ 1973 if (0 > len || len > 128) { 1974 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1975 len); 1976 return; 1977 } 1978 1979 bzero(maskp, sizeof(*maskp)); 1980 bytelen = len / 8; 1981 bitlen = len % 8; 1982 for (i = 0; i < bytelen; i++) 1983 maskp->s6_addr[i] = 0xff; 1984 if (bitlen) 1985 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1986 } 1987 1988 /* 1989 * return the best address out of the same scope 1990 */ 1991 struct in6_ifaddr * 1992 in6_ifawithscope(struct ifnet *oifp, struct in6_addr *dst) 1993 { 1994 int dst_scope = in6_addrscope(dst), src_scope, best_scope = 0; 1995 int blen = -1; 1996 struct ifnet *ifp; 1997 struct in6_ifaddr *ifa_best = NULL; 1998 1999 if (oifp == NULL) { 2000 #if 0 2001 kprintf("in6_ifawithscope: output interface is not specified\n"); 2002 #endif 2003 return (NULL); 2004 } 2005 2006 /* 2007 * We search for all addresses on all interfaces from the beginning. 2008 * Comparing an interface with the outgoing interface will be done 2009 * only at the final stage of tiebreaking. 2010 */ 2011 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 2012 { 2013 struct ifaddr_container *ifac; 2014 2015 /* 2016 * We can never take an address that breaks the scope zone 2017 * of the destination. 2018 */ 2019 if (in6_addr2scopeid(ifp, dst) != in6_addr2scopeid(oifp, dst)) 2020 continue; 2021 2022 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2023 int tlen = -1, dscopecmp, bscopecmp, matchcmp; 2024 struct ifaddr *ifa = ifac->ifa; 2025 2026 if (ifa->ifa_addr->sa_family != AF_INET6) 2027 continue; 2028 2029 src_scope = in6_addrscope(IFA_IN6(ifa)); 2030 2031 /* 2032 * Don't use an address before completing DAD 2033 * nor a duplicated address. 2034 */ 2035 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2036 IN6_IFF_NOTREADY) 2037 continue; 2038 2039 /* XXX: is there any case to allow anycasts? */ 2040 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2041 IN6_IFF_ANYCAST) 2042 continue; 2043 2044 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2045 IN6_IFF_DETACHED) 2046 continue; 2047 2048 /* 2049 * If this is the first address we find, 2050 * keep it anyway. 2051 */ 2052 if (ifa_best == NULL) 2053 goto replace; 2054 2055 /* 2056 * ifa_best is never NULL beyond this line except 2057 * within the block labeled "replace". 2058 */ 2059 2060 /* 2061 * If ifa_best has a smaller scope than dst and 2062 * the current address has a larger one than 2063 * (or equal to) dst, always replace ifa_best. 2064 * Also, if the current address has a smaller scope 2065 * than dst, ignore it unless ifa_best also has a 2066 * smaller scope. 2067 * Consequently, after the two if-clause below, 2068 * the followings must be satisfied: 2069 * (scope(src) < scope(dst) && 2070 * scope(best) < scope(dst)) 2071 * OR 2072 * (scope(best) >= scope(dst) && 2073 * scope(src) >= scope(dst)) 2074 */ 2075 if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0 && 2076 IN6_ARE_SCOPE_CMP(src_scope, dst_scope) >= 0) 2077 goto replace; /* (A) */ 2078 if (IN6_ARE_SCOPE_CMP(src_scope, dst_scope) < 0 && 2079 IN6_ARE_SCOPE_CMP(best_scope, dst_scope) >= 0) 2080 continue; /* (B) */ 2081 2082 /* 2083 * A deprecated address SHOULD NOT be used in new 2084 * communications if an alternate (non-deprecated) 2085 * address is available and has sufficient scope. 2086 * RFC 2462, Section 5.5.4. 2087 */ 2088 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2089 IN6_IFF_DEPRECATED) { 2090 /* 2091 * Ignore any deprecated addresses if 2092 * specified by configuration. 2093 */ 2094 if (!ip6_use_deprecated) 2095 continue; 2096 2097 /* 2098 * If we have already found a non-deprecated 2099 * candidate, just ignore deprecated addresses. 2100 */ 2101 if (!(ifa_best->ia6_flags & IN6_IFF_DEPRECATED)) 2102 continue; 2103 } 2104 2105 /* 2106 * A non-deprecated address is always preferred 2107 * to a deprecated one regardless of scopes and 2108 * address matching (Note invariants ensured by the 2109 * conditions (A) and (B) above.) 2110 */ 2111 if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) && 2112 !(((struct in6_ifaddr *)ifa)->ia6_flags & 2113 IN6_IFF_DEPRECATED)) 2114 goto replace; 2115 2116 /* 2117 * When we use temporary addresses described in 2118 * RFC 3041, we prefer temporary addresses to 2119 * public autoconf addresses. Again, note the 2120 * invariants from (A) and (B). Also note that we 2121 * don't have any preference between static addresses 2122 * and autoconf addresses (despite of whether or not 2123 * the latter is temporary or public.) 2124 */ 2125 if (ip6_use_tempaddr) { 2126 struct in6_ifaddr *ifat; 2127 2128 ifat = (struct in6_ifaddr *)ifa; 2129 if ((ifa_best->ia6_flags & 2130 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2131 == IN6_IFF_AUTOCONF && 2132 (ifat->ia6_flags & 2133 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2134 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) { 2135 goto replace; 2136 } 2137 if ((ifa_best->ia6_flags & 2138 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2139 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY) && 2140 (ifat->ia6_flags & 2141 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2142 == IN6_IFF_AUTOCONF) { 2143 continue; 2144 } 2145 } 2146 2147 /* 2148 * At this point, we have two cases: 2149 * 1. we are looking at a non-deprecated address, 2150 * and ifa_best is also non-deprecated. 2151 * 2. we are looking at a deprecated address, 2152 * and ifa_best is also deprecated. 2153 * Also, we do not have to consider a case where 2154 * the scope of if_best is larger(smaller) than dst and 2155 * the scope of the current address is smaller(larger) 2156 * than dst. Such a case has already been covered. 2157 * Tiebreaking is done according to the following 2158 * items: 2159 * - the scope comparison between the address and 2160 * dst (dscopecmp) 2161 * - the scope comparison between the address and 2162 * ifa_best (bscopecmp) 2163 * - if the address match dst longer than ifa_best 2164 * (matchcmp) 2165 * - if the address is on the outgoing I/F (outI/F) 2166 * 2167 * Roughly speaking, the selection policy is 2168 * - the most important item is scope. The same scope 2169 * is best. Then search for a larger scope. 2170 * Smaller scopes are the last resort. 2171 * - A deprecated address is chosen only when we have 2172 * no address that has an enough scope, but is 2173 * prefered to any addresses of smaller scopes 2174 * (this must be already done above.) 2175 * - addresses on the outgoing I/F are preferred to 2176 * ones on other interfaces if none of above 2177 * tiebreaks. In the table below, the column "bI" 2178 * means if the best_ifa is on the outgoing 2179 * interface, and the column "sI" means if the ifa 2180 * is on the outgoing interface. 2181 * - If there is no other reasons to choose one, 2182 * longest address match against dst is considered. 2183 * 2184 * The precise decision table is as follows: 2185 * dscopecmp bscopecmp match bI oI | replace? 2186 * N/A equal N/A Y N | No (1) 2187 * N/A equal N/A N Y | Yes (2) 2188 * N/A equal larger N/A | Yes (3) 2189 * N/A equal !larger N/A | No (4) 2190 * larger larger N/A N/A | No (5) 2191 * larger smaller N/A N/A | Yes (6) 2192 * smaller larger N/A N/A | Yes (7) 2193 * smaller smaller N/A N/A | No (8) 2194 * equal smaller N/A N/A | Yes (9) 2195 * equal larger (already done at A above) 2196 */ 2197 dscopecmp = IN6_ARE_SCOPE_CMP(src_scope, dst_scope); 2198 bscopecmp = IN6_ARE_SCOPE_CMP(src_scope, best_scope); 2199 2200 if (bscopecmp == 0) { 2201 struct ifnet *bifp = ifa_best->ia_ifp; 2202 2203 if (bifp == oifp && ifp != oifp) /* (1) */ 2204 continue; 2205 if (bifp != oifp && ifp == oifp) /* (2) */ 2206 goto replace; 2207 2208 /* 2209 * Both bifp and ifp are on the outgoing 2210 * interface, or both two are on a different 2211 * interface from the outgoing I/F. 2212 * now we need address matching against dst 2213 * for tiebreaking. 2214 */ 2215 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2216 matchcmp = tlen - blen; 2217 if (matchcmp > 0) /* (3) */ 2218 goto replace; 2219 continue; /* (4) */ 2220 } 2221 if (dscopecmp > 0) { 2222 if (bscopecmp > 0) /* (5) */ 2223 continue; 2224 goto replace; /* (6) */ 2225 } 2226 if (dscopecmp < 0) { 2227 if (bscopecmp > 0) /* (7) */ 2228 goto replace; 2229 continue; /* (8) */ 2230 } 2231 2232 /* now dscopecmp must be 0 */ 2233 if (bscopecmp < 0) 2234 goto replace; /* (9) */ 2235 2236 replace: 2237 ifa_best = (struct in6_ifaddr *)ifa; 2238 blen = tlen >= 0 ? tlen : 2239 in6_matchlen(IFA_IN6(ifa), dst); 2240 best_scope = in6_addrscope(&ifa_best->ia_addr.sin6_addr); 2241 } 2242 } 2243 2244 /* count statistics for future improvements */ 2245 if (ifa_best == NULL) 2246 ip6stat.ip6s_sources_none++; 2247 else { 2248 if (oifp == ifa_best->ia_ifp) 2249 ip6stat.ip6s_sources_sameif[best_scope]++; 2250 else 2251 ip6stat.ip6s_sources_otherif[best_scope]++; 2252 2253 if (best_scope == dst_scope) 2254 ip6stat.ip6s_sources_samescope[best_scope]++; 2255 else 2256 ip6stat.ip6s_sources_otherscope[best_scope]++; 2257 2258 if (ifa_best->ia6_flags & IN6_IFF_DEPRECATED) 2259 ip6stat.ip6s_sources_deprecated[best_scope]++; 2260 } 2261 2262 return (ifa_best); 2263 } 2264 2265 /* 2266 * return the best address out of the same scope. if no address was 2267 * found, return the first valid address from designated IF. 2268 */ 2269 struct in6_ifaddr * 2270 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2271 { 2272 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2273 struct ifaddr_container *ifac; 2274 struct in6_ifaddr *besta = 0; 2275 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2276 2277 dep[0] = dep[1] = NULL; 2278 2279 /* 2280 * We first look for addresses in the same scope. 2281 * If there is one, return it. 2282 * If two or more, return one which matches the dst longest. 2283 * If none, return one of global addresses assigned other ifs. 2284 */ 2285 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2286 struct ifaddr *ifa = ifac->ifa; 2287 2288 if (ifa->ifa_addr->sa_family != AF_INET6) 2289 continue; 2290 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2291 continue; /* XXX: is there any case to allow anycast? */ 2292 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2293 continue; /* don't use this interface */ 2294 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2295 continue; 2296 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2297 if (ip6_use_deprecated) 2298 dep[0] = (struct in6_ifaddr *)ifa; 2299 continue; 2300 } 2301 2302 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2303 /* 2304 * call in6_matchlen() as few as possible 2305 */ 2306 if (besta) { 2307 if (blen == -1) 2308 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2309 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2310 if (tlen > blen) { 2311 blen = tlen; 2312 besta = (struct in6_ifaddr *)ifa; 2313 } 2314 } else 2315 besta = (struct in6_ifaddr *)ifa; 2316 } 2317 } 2318 if (besta) 2319 return (besta); 2320 2321 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2322 struct ifaddr *ifa = ifac->ifa; 2323 2324 if (ifa->ifa_addr->sa_family != AF_INET6) 2325 continue; 2326 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2327 continue; /* XXX: is there any case to allow anycast? */ 2328 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2329 continue; /* don't use this interface */ 2330 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2331 continue; 2332 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2333 if (ip6_use_deprecated) 2334 dep[1] = (struct in6_ifaddr *)ifa; 2335 continue; 2336 } 2337 2338 return (struct in6_ifaddr *)ifa; 2339 } 2340 2341 /* use the last-resort values, that are, deprecated addresses */ 2342 if (dep[0]) 2343 return dep[0]; 2344 if (dep[1]) 2345 return dep[1]; 2346 2347 return NULL; 2348 } 2349 2350 /* 2351 * perform DAD when interface becomes IFF_UP. 2352 */ 2353 void 2354 in6_if_up(struct ifnet *ifp) 2355 { 2356 struct ifaddr_container *ifac; 2357 struct in6_ifaddr *ia; 2358 int dad_delay; /* delay ticks before DAD output */ 2359 2360 /* 2361 * special cases, like 6to4, are handled in in6_ifattach 2362 */ 2363 in6_ifattach(ifp, NULL); 2364 2365 dad_delay = 0; 2366 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2367 struct ifaddr *ifa = ifac->ifa; 2368 2369 if (ifa->ifa_addr->sa_family != AF_INET6) 2370 continue; 2371 ia = (struct in6_ifaddr *)ifa; 2372 if (ia->ia6_flags & IN6_IFF_TENTATIVE) 2373 nd6_dad_start(ifa, &dad_delay); 2374 } 2375 } 2376 2377 int 2378 in6if_do_dad(struct ifnet *ifp) 2379 { 2380 if (ifp->if_flags & IFF_LOOPBACK) 2381 return (0); 2382 2383 switch (ifp->if_type) { 2384 #ifdef IFT_DUMMY 2385 case IFT_DUMMY: 2386 #endif 2387 case IFT_FAITH: 2388 /* 2389 * These interfaces do not have the IFF_LOOPBACK flag, 2390 * but loop packets back. We do not have to do DAD on such 2391 * interfaces. We should even omit it, because loop-backed 2392 * NS would confuse the DAD procedure. 2393 */ 2394 return (0); 2395 default: 2396 /* 2397 * Our DAD routine requires the interface up and running. 2398 * However, some interfaces can be up before the RUNNING 2399 * status. Additionaly, users may try to assign addresses 2400 * before the interface becomes up (or running). 2401 * We simply skip DAD in such a case as a work around. 2402 * XXX: we should rather mark "tentative" on such addresses, 2403 * and do DAD after the interface becomes ready. 2404 */ 2405 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != 2406 (IFF_UP|IFF_RUNNING)) 2407 return (0); 2408 2409 return (1); 2410 } 2411 } 2412 2413 /* 2414 * Calculate max IPv6 MTU through all the interfaces and store it 2415 * to in6_maxmtu. 2416 */ 2417 void 2418 in6_setmaxmtu(void) 2419 { 2420 unsigned long maxmtu = 0; 2421 struct ifnet *ifp; 2422 2423 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 2424 { 2425 if (!(ifp->if_flags & IFF_LOOPBACK) && 2426 ND_IFINFO(ifp)->linkmtu > maxmtu) 2427 maxmtu = ND_IFINFO(ifp)->linkmtu; 2428 } 2429 if (maxmtu) /* update only when maxmtu is positive */ 2430 in6_maxmtu = maxmtu; 2431 } 2432 2433 void * 2434 in6_domifattach(struct ifnet *ifp) 2435 { 2436 struct in6_ifextra *ext; 2437 2438 ext = (struct in6_ifextra *)kmalloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2439 bzero(ext, sizeof(*ext)); 2440 2441 ext->in6_ifstat = (struct in6_ifstat *)kmalloc(sizeof(struct in6_ifstat), 2442 M_IFADDR, M_WAITOK); 2443 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat)); 2444 2445 ext->icmp6_ifstat = 2446 (struct icmp6_ifstat *)kmalloc(sizeof(struct icmp6_ifstat), 2447 M_IFADDR, M_WAITOK); 2448 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat)); 2449 2450 ext->nd_ifinfo = nd6_ifattach(ifp); 2451 ext->scope6_id = scope6_ifattach(ifp); 2452 return ext; 2453 } 2454 2455 void 2456 in6_domifdetach(struct ifnet *ifp, void *aux) 2457 { 2458 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2459 scope6_ifdetach(ext->scope6_id); 2460 nd6_ifdetach(ext->nd_ifinfo); 2461 kfree(ext->in6_ifstat, M_IFADDR); 2462 kfree(ext->icmp6_ifstat, M_IFADDR); 2463 kfree(ext, M_IFADDR); 2464 } 2465 2466 /* 2467 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2468 * v4 mapped addr or v4 compat addr 2469 */ 2470 void 2471 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2472 { 2473 bzero(sin, sizeof(*sin)); 2474 sin->sin_len = sizeof(struct sockaddr_in); 2475 sin->sin_family = AF_INET; 2476 sin->sin_port = sin6->sin6_port; 2477 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2478 } 2479 2480 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2481 void 2482 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2483 { 2484 bzero(sin6, sizeof(*sin6)); 2485 sin6->sin6_len = sizeof(struct sockaddr_in6); 2486 sin6->sin6_family = AF_INET6; 2487 sin6->sin6_port = sin->sin_port; 2488 sin6->sin6_addr.s6_addr32[0] = 0; 2489 sin6->sin6_addr.s6_addr32[1] = 0; 2490 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2491 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2492 } 2493 2494 /* Convert sockaddr_in6 into sockaddr_in. */ 2495 void 2496 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2497 { 2498 struct sockaddr_in *sin_p; 2499 struct sockaddr_in6 sin6; 2500 2501 /* 2502 * Save original sockaddr_in6 addr and convert it 2503 * to sockaddr_in. 2504 */ 2505 sin6 = *(struct sockaddr_in6 *)nam; 2506 sin_p = (struct sockaddr_in *)nam; 2507 in6_sin6_2_sin(sin_p, &sin6); 2508 } 2509 2510 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2511 void 2512 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2513 { 2514 struct sockaddr_in *sin_p; 2515 struct sockaddr_in6 *sin6_p; 2516 2517 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 2518 M_WAITOK); 2519 sin_p = (struct sockaddr_in *)*nam; 2520 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2521 FREE(*nam, M_SONAME); 2522 *nam = (struct sockaddr *)sin6_p; 2523 } 2524