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 1.25 2007/08/16 20:03:58 dillon 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 ifaddr *ifa; 306 struct sockaddr_in6 *sin6; 307 308 if (idx < 0 || if_index < idx) 309 return -1; 310 ifp = ifindex2ifnet[idx]; 311 312 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 313 { 314 if (ifa->ifa_addr->sa_family != AF_INET6) 315 continue; 316 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 317 if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) 318 return sin6->sin6_scope_id & 0xffff; 319 } 320 321 return -1; 322 } 323 324 int 325 in6_mask2len(struct in6_addr *mask, u_char *lim0) 326 { 327 int x = 0, y; 328 u_char *lim = lim0, *p; 329 330 if (lim0 == NULL || 331 lim0 - (u_char *)mask > sizeof(*mask)) /* ignore the scope_id part */ 332 lim = (u_char *)mask + sizeof(*mask); 333 for (p = (u_char *)mask; p < lim; x++, p++) { 334 if (*p != 0xff) 335 break; 336 } 337 y = 0; 338 if (p < lim) { 339 for (y = 0; y < 8; y++) { 340 if ((*p & (0x80 >> y)) == 0) 341 break; 342 } 343 } 344 345 /* 346 * when the limit pointer is given, do a stricter check on the 347 * remaining bits. 348 */ 349 if (p < lim) { 350 if (y != 0 && (*p & (0x00ff >> y)) != 0) 351 return (-1); 352 for (p = p + 1; p < lim; p++) 353 if (*p != 0) 354 return (-1); 355 } 356 357 return x * 8 + y; 358 } 359 360 void 361 in6_len2mask(struct in6_addr *mask, int len) 362 { 363 int i; 364 365 bzero(mask, sizeof(*mask)); 366 for (i = 0; i < len / 8; i++) 367 mask->s6_addr8[i] = 0xff; 368 if (len % 8) 369 mask->s6_addr8[i] = (0xff00 >> (len % 8)) & 0xff; 370 } 371 372 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 373 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 374 375 int 376 in6_control(struct socket *so, u_long cmd, caddr_t data, 377 struct ifnet *ifp, struct thread *td) 378 { 379 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 380 struct in6_ifaddr *ia = NULL; 381 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 382 int privileged; 383 int error; 384 385 privileged = 0; 386 if (suser(td) == 0) 387 privileged++; 388 389 switch (cmd) { 390 case SIOCGETSGCNT_IN6: 391 case SIOCGETMIFCNT_IN6: 392 return (mrt6_ioctl(cmd, data)); 393 } 394 395 if (ifp == NULL) 396 return (EOPNOTSUPP); 397 398 switch (cmd) { 399 case SIOCSNDFLUSH_IN6: 400 case SIOCSPFXFLUSH_IN6: 401 case SIOCSRTRFLUSH_IN6: 402 case SIOCSDEFIFACE_IN6: 403 case SIOCSIFINFO_FLAGS: 404 if (!privileged) 405 return (EPERM); 406 /* fall through */ 407 case OSIOCGIFINFO_IN6: 408 case SIOCGIFINFO_IN6: 409 case SIOCGDRLST_IN6: 410 case SIOCGPRLST_IN6: 411 case SIOCGNBRINFO_IN6: 412 case SIOCGDEFIFACE_IN6: 413 return (nd6_ioctl(cmd, data, ifp)); 414 } 415 416 switch (cmd) { 417 case SIOCSIFPREFIX_IN6: 418 case SIOCDIFPREFIX_IN6: 419 case SIOCAIFPREFIX_IN6: 420 case SIOCCIFPREFIX_IN6: 421 case SIOCSGIFPREFIX_IN6: 422 case SIOCGIFPREFIX_IN6: 423 log(LOG_NOTICE, 424 "prefix ioctls are now invalidated. " 425 "please use ifconfig.\n"); 426 return (EOPNOTSUPP); 427 } 428 429 switch (cmd) { 430 case SIOCSSCOPE6: 431 if (!privileged) 432 return (EPERM); 433 return (scope6_set(ifp, 434 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 435 break; 436 case SIOCGSCOPE6: 437 return (scope6_get(ifp, 438 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 439 break; 440 case SIOCGSCOPE6DEF: 441 return (scope6_get_default((struct scope6_id *) 442 ifr->ifr_ifru.ifru_scope_id)); 443 break; 444 } 445 446 switch (cmd) { 447 case SIOCALIFADDR: 448 case SIOCDLIFADDR: 449 if (!privileged) 450 return (EPERM); 451 /* fall through */ 452 case SIOCGLIFADDR: 453 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 454 } 455 456 /* 457 * Find address for this interface, if it exists. 458 */ 459 if (ifra->ifra_addr.sin6_family == AF_INET6) { /* XXX */ 460 struct sockaddr_in6 *sa6 = 461 (struct sockaddr_in6 *)&ifra->ifra_addr; 462 463 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) { 464 if (sa6->sin6_addr.s6_addr16[1] == 0) { 465 /* link ID is not embedded by the user */ 466 sa6->sin6_addr.s6_addr16[1] = 467 htons(ifp->if_index); 468 } else if (sa6->sin6_addr.s6_addr16[1] != 469 htons(ifp->if_index)) { 470 return (EINVAL); /* link ID contradicts */ 471 } 472 if (sa6->sin6_scope_id) { 473 if (sa6->sin6_scope_id != 474 (u_int32_t)ifp->if_index) 475 return (EINVAL); 476 sa6->sin6_scope_id = 0; /* XXX: good way? */ 477 } 478 } 479 ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr); 480 } 481 482 switch (cmd) { 483 case SIOCSIFADDR_IN6: 484 case SIOCSIFDSTADDR_IN6: 485 case SIOCSIFNETMASK_IN6: 486 /* 487 * Since IPv6 allows a node to assign multiple addresses 488 * on a single interface, SIOCSIFxxx ioctls are not suitable 489 * and should be unused. 490 */ 491 /* we decided to obsolete this command (20000704) */ 492 return (EINVAL); 493 494 case SIOCDIFADDR_IN6: 495 /* 496 * for IPv4, we look for existing in_ifaddr here to allow 497 * "ifconfig if0 delete" to remove first IPv4 address on the 498 * interface. For IPv6, as the spec allow multiple interface 499 * address from the day one, we consider "remove the first one" 500 * semantics to be not preferable. 501 */ 502 if (ia == NULL) 503 return (EADDRNOTAVAIL); 504 /* FALLTHROUGH */ 505 case SIOCAIFADDR_IN6: 506 /* 507 * We always require users to specify a valid IPv6 address for 508 * the corresponding operation. 509 */ 510 if (ifra->ifra_addr.sin6_family != AF_INET6 || 511 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) 512 return (EAFNOSUPPORT); 513 if (!privileged) 514 return (EPERM); 515 516 break; 517 518 case SIOCGIFADDR_IN6: 519 /* This interface is basically deprecated. use SIOCGIFCONF. */ 520 /* fall through */ 521 case SIOCGIFAFLAG_IN6: 522 case SIOCGIFNETMASK_IN6: 523 case SIOCGIFDSTADDR_IN6: 524 case SIOCGIFALIFETIME_IN6: 525 /* must think again about its semantics */ 526 if (ia == NULL) 527 return (EADDRNOTAVAIL); 528 break; 529 case SIOCSIFALIFETIME_IN6: 530 { 531 struct in6_addrlifetime *lt; 532 533 if (!privileged) 534 return (EPERM); 535 if (ia == NULL) 536 return (EADDRNOTAVAIL); 537 /* sanity for overflow - beware unsigned */ 538 lt = &ifr->ifr_ifru.ifru_lifetime; 539 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME 540 && lt->ia6t_vltime + time_second < time_second) { 541 return EINVAL; 542 } 543 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME 544 && lt->ia6t_pltime + time_second < time_second) { 545 return EINVAL; 546 } 547 break; 548 } 549 } 550 551 switch (cmd) { 552 553 case SIOCGIFADDR_IN6: 554 ifr->ifr_addr = ia->ia_addr; 555 break; 556 557 case SIOCGIFDSTADDR_IN6: 558 if (!(ifp->if_flags & IFF_POINTOPOINT)) 559 return (EINVAL); 560 /* 561 * XXX: should we check if ifa_dstaddr is NULL and return 562 * an error? 563 */ 564 ifr->ifr_dstaddr = ia->ia_dstaddr; 565 break; 566 567 case SIOCGIFNETMASK_IN6: 568 ifr->ifr_addr = ia->ia_prefixmask; 569 break; 570 571 case SIOCGIFAFLAG_IN6: 572 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 573 break; 574 575 case SIOCGIFSTAT_IN6: 576 if (ifp == NULL) 577 return EINVAL; 578 bzero(&ifr->ifr_ifru.ifru_stat, 579 sizeof(ifr->ifr_ifru.ifru_stat)); 580 ifr->ifr_ifru.ifru_stat = 581 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat; 582 break; 583 584 case SIOCGIFSTAT_ICMP6: 585 bzero(&ifr->ifr_ifru.ifru_stat, 586 sizeof(ifr->ifr_ifru.ifru_icmp6stat)); 587 ifr->ifr_ifru.ifru_icmp6stat = 588 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat; 589 break; 590 591 case SIOCGIFALIFETIME_IN6: 592 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 593 break; 594 595 case SIOCSIFALIFETIME_IN6: 596 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; 597 /* for sanity */ 598 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 599 ia->ia6_lifetime.ia6t_expire = 600 time_second + ia->ia6_lifetime.ia6t_vltime; 601 } else 602 ia->ia6_lifetime.ia6t_expire = 0; 603 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 604 ia->ia6_lifetime.ia6t_preferred = 605 time_second + ia->ia6_lifetime.ia6t_pltime; 606 } else 607 ia->ia6_lifetime.ia6t_preferred = 0; 608 break; 609 610 case SIOCAIFADDR_IN6: 611 { 612 int i, error = 0; 613 struct nd_prefix pr0, *pr; 614 615 /* 616 * first, make or update the interface address structure, 617 * and link it to the list. 618 */ 619 if ((error = in6_update_ifa(ifp, ifra, ia)) != 0) 620 return (error); 621 622 /* 623 * then, make the prefix on-link on the interface. 624 * XXX: we'd rather create the prefix before the address, but 625 * we need at least one address to install the corresponding 626 * interface route, so we configure the address first. 627 */ 628 629 /* 630 * convert mask to prefix length (prefixmask has already 631 * been validated in in6_update_ifa(). 632 */ 633 bzero(&pr0, sizeof(pr0)); 634 pr0.ndpr_ifp = ifp; 635 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 636 NULL); 637 if (pr0.ndpr_plen == 128) 638 break; /* we don't need to install a host route. */ 639 pr0.ndpr_prefix = ifra->ifra_addr; 640 pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr; 641 /* apply the mask for safety. */ 642 for (i = 0; i < 4; i++) { 643 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 644 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i]; 645 } 646 /* 647 * XXX: since we don't have an API to set prefix (not address) 648 * lifetimes, we just use the same lifetimes as addresses. 649 * The (temporarily) installed lifetimes can be overridden by 650 * later advertised RAs (when accept_rtadv is non 0), which is 651 * an intended behavior. 652 */ 653 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 654 pr0.ndpr_raf_auto = 655 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 656 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 657 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 658 659 /* add the prefix if there's one. */ 660 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 661 /* 662 * nd6_prelist_add will install the corresponding 663 * interface route. 664 */ 665 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) 666 return (error); 667 if (pr == NULL) { 668 log(LOG_ERR, "nd6_prelist_add succedded but " 669 "no prefix\n"); 670 return (EINVAL); /* XXX panic here? */ 671 } 672 } 673 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 674 == NULL) { 675 /* XXX: this should not happen! */ 676 log(LOG_ERR, "in6_control: addition succeeded, but" 677 " no ifaddr\n"); 678 } else { 679 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 680 ia->ia6_ndpr == NULL) { /* new autoconfed addr */ 681 ia->ia6_ndpr = pr; 682 pr->ndpr_refcnt++; 683 684 /* 685 * If this is the first autoconf address from 686 * the prefix, create a temporary address 687 * as well (when specified). 688 */ 689 if (ip6_use_tempaddr && 690 pr->ndpr_refcnt == 1) { 691 int e; 692 if ((e = in6_tmpifadd(ia, 1)) != 0) { 693 log(LOG_NOTICE, "in6_control: " 694 "failed to create a " 695 "temporary address, " 696 "errno=%d\n", 697 e); 698 } 699 } 700 } 701 702 /* 703 * this might affect the status of autoconfigured 704 * addresses, that is, this address might make 705 * other addresses detached. 706 */ 707 pfxlist_onlink_check(); 708 } 709 if (error == 0 && ia) 710 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 711 break; 712 } 713 714 case SIOCDIFADDR_IN6: 715 { 716 int i = 0; 717 struct nd_prefix pr0, *pr; 718 719 /* 720 * If the address being deleted is the only one that owns 721 * the corresponding prefix, expire the prefix as well. 722 * XXX: theoretically, we don't have to warry about such 723 * relationship, since we separate the address management 724 * and the prefix management. We do this, however, to provide 725 * as much backward compatibility as possible in terms of 726 * the ioctl operation. 727 */ 728 bzero(&pr0, sizeof(pr0)); 729 pr0.ndpr_ifp = ifp; 730 pr0.ndpr_plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, 731 NULL); 732 if (pr0.ndpr_plen == 128) 733 goto purgeaddr; 734 pr0.ndpr_prefix = ia->ia_addr; 735 pr0.ndpr_mask = ia->ia_prefixmask.sin6_addr; 736 for (i = 0; i < 4; i++) { 737 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 738 ia->ia_prefixmask.sin6_addr.s6_addr32[i]; 739 } 740 /* 741 * The logic of the following condition is a bit complicated. 742 * We expire the prefix when 743 * 1. the address obeys autoconfiguration and it is the 744 * only owner of the associated prefix, or 745 * 2. the address does not obey autoconf and there is no 746 * other owner of the prefix. 747 */ 748 if ((pr = nd6_prefix_lookup(&pr0)) != NULL && 749 (((ia->ia6_flags & IN6_IFF_AUTOCONF) && 750 pr->ndpr_refcnt == 1) || 751 (!(ia->ia6_flags & IN6_IFF_AUTOCONF) && 752 pr->ndpr_refcnt == 0))) { 753 pr->ndpr_expire = 1; /* XXX: just for expiration */ 754 } 755 756 purgeaddr: 757 in6_purgeaddr(&ia->ia_ifa); 758 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 759 break; 760 } 761 762 default: 763 if (ifp == NULL || ifp->if_ioctl == 0) 764 return (EOPNOTSUPP); 765 lwkt_serialize_enter(ifp->if_serializer); 766 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred); 767 lwkt_serialize_exit(ifp->if_serializer); 768 return (error); 769 } 770 771 return (0); 772 } 773 774 /* 775 * Update parameters of an IPv6 interface address. 776 * If necessary, a new entry is created and linked into address chains. 777 * This function is separated from in6_control(). 778 * XXX: should this be performed under splnet()? 779 */ 780 int 781 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 782 struct in6_ifaddr *ia) 783 { 784 int error = 0, hostIsNew = 0, plen = -1; 785 struct in6_ifaddr *oia; 786 struct sockaddr_in6 dst6; 787 struct in6_addrlifetime *lt; 788 789 /* Validate parameters */ 790 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 791 return (EINVAL); 792 793 /* 794 * The destination address for a p2p link must have a family 795 * of AF_UNSPEC or AF_INET6. 796 */ 797 if ((ifp->if_flags & IFF_POINTOPOINT) && 798 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 799 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 800 return (EAFNOSUPPORT); 801 /* 802 * validate ifra_prefixmask. don't check sin6_family, netmask 803 * does not carry fields other than sin6_len. 804 */ 805 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 806 return (EINVAL); 807 /* 808 * Because the IPv6 address architecture is classless, we require 809 * users to specify a (non 0) prefix length (mask) for a new address. 810 * We also require the prefix (when specified) mask is valid, and thus 811 * reject a non-consecutive mask. 812 */ 813 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 814 return (EINVAL); 815 if (ifra->ifra_prefixmask.sin6_len != 0) { 816 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 817 (u_char *)&ifra->ifra_prefixmask + 818 ifra->ifra_prefixmask.sin6_len); 819 if (plen <= 0) 820 return (EINVAL); 821 } 822 else { 823 /* 824 * In this case, ia must not be NULL. We just use its prefix 825 * length. 826 */ 827 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 828 } 829 /* 830 * If the destination address on a p2p interface is specified, 831 * and the address is a scoped one, validate/set the scope 832 * zone identifier. 833 */ 834 dst6 = ifra->ifra_dstaddr; 835 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) && 836 (dst6.sin6_family == AF_INET6)) { 837 int scopeid; 838 839 if ((error = in6_recoverscope(&dst6, 840 &ifra->ifra_dstaddr.sin6_addr, 841 ifp)) != 0) 842 return (error); 843 scopeid = in6_addr2scopeid(ifp, &dst6.sin6_addr); 844 if (dst6.sin6_scope_id == 0) /* user omit to specify the ID. */ 845 dst6.sin6_scope_id = scopeid; 846 else if (dst6.sin6_scope_id != scopeid) 847 return (EINVAL); /* scope ID mismatch. */ 848 if ((error = in6_embedscope(&dst6.sin6_addr, &dst6, NULL, NULL)) 849 != 0) 850 return (error); 851 dst6.sin6_scope_id = 0; /* XXX */ 852 } 853 /* 854 * The destination address can be specified only for a p2p or a 855 * loopback interface. If specified, the corresponding prefix length 856 * must be 128. 857 */ 858 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 859 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0) { 860 /* XXX: noisy message */ 861 log(LOG_INFO, "in6_update_ifa: a destination can be " 862 "specified for a p2p or a loopback IF only\n"); 863 return (EINVAL); 864 } 865 if (plen != 128) { 866 /* 867 * The following message seems noisy, but we dare to 868 * add it for diagnosis. 869 */ 870 log(LOG_INFO, "in6_update_ifa: prefixlen must be 128 " 871 "when dstaddr is specified\n"); 872 return (EINVAL); 873 } 874 } 875 /* lifetime consistency check */ 876 lt = &ifra->ifra_lifetime; 877 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME 878 && lt->ia6t_vltime + time_second < time_second) { 879 return EINVAL; 880 } 881 if (lt->ia6t_vltime == 0) { 882 /* 883 * the following log might be noisy, but this is a typical 884 * configuration mistake or a tool's bug. 885 */ 886 log(LOG_INFO, 887 "in6_update_ifa: valid lifetime is 0 for %s\n", 888 ip6_sprintf(&ifra->ifra_addr.sin6_addr)); 889 } 890 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME 891 && lt->ia6t_pltime + time_second < time_second) { 892 return EINVAL; 893 } 894 895 /* 896 * If this is a new address, allocate a new ifaddr and link it 897 * into chains. 898 */ 899 if (ia == NULL) { 900 hostIsNew = 1; 901 /* 902 * When in6_update_ifa() is called in a process of a received 903 * RA, it is called under splnet(). So, we should call malloc 904 * with M_NOWAIT. 905 */ 906 ia = (struct in6_ifaddr *) 907 kmalloc(sizeof(*ia), M_IFADDR, M_NOWAIT); 908 if (ia == NULL) 909 return (ENOBUFS); 910 bzero((caddr_t)ia, sizeof(*ia)); 911 /* Initialize the address and masks */ 912 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 913 ia->ia_addr.sin6_family = AF_INET6; 914 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 915 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 916 /* 917 * XXX: some functions expect that ifa_dstaddr is not 918 * NULL for p2p interfaces. 919 */ 920 ia->ia_ifa.ifa_dstaddr 921 = (struct sockaddr *)&ia->ia_dstaddr; 922 } else { 923 ia->ia_ifa.ifa_dstaddr = NULL; 924 } 925 ia->ia_ifa.ifa_netmask 926 = (struct sockaddr *)&ia->ia_prefixmask; 927 928 ia->ia_ifp = ifp; 929 if ((oia = in6_ifaddr) != NULL) { 930 for ( ; oia->ia_next; oia = oia->ia_next) 931 continue; 932 oia->ia_next = ia; 933 } else 934 in6_ifaddr = ia; 935 936 TAILQ_INSERT_TAIL(&ifp->if_addrlist, &ia->ia_ifa, 937 ifa_list); 938 } 939 940 /* set prefix mask */ 941 if (ifra->ifra_prefixmask.sin6_len) { 942 /* 943 * We prohibit changing the prefix length of an existing 944 * address, because 945 * + such an operation should be rare in IPv6, and 946 * + the operation would confuse prefix management. 947 */ 948 if (ia->ia_prefixmask.sin6_len && 949 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 950 log(LOG_INFO, "in6_update_ifa: the prefix length of an" 951 " existing (%s) address should not be changed\n", 952 ip6_sprintf(&ia->ia_addr.sin6_addr)); 953 error = EINVAL; 954 goto unlink; 955 } 956 ia->ia_prefixmask = ifra->ifra_prefixmask; 957 } 958 959 /* 960 * If a new destination address is specified, scrub the old one and 961 * install the new destination. Note that the interface must be 962 * p2p or loopback (see the check above.) 963 */ 964 if (dst6.sin6_family == AF_INET6 && 965 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, 966 &ia->ia_dstaddr.sin6_addr)) { 967 int e; 968 969 if ((ia->ia_flags & IFA_ROUTE) && 970 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 971 != 0) { 972 log(LOG_ERR, "in6_update_ifa: failed to remove " 973 "a route to the old destination: %s\n", 974 ip6_sprintf(&ia->ia_addr.sin6_addr)); 975 /* proceed anyway... */ 976 } 977 else 978 ia->ia_flags &= ~IFA_ROUTE; 979 ia->ia_dstaddr = dst6; 980 } 981 982 /* reset the interface and routing table appropriately. */ 983 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 984 goto unlink; 985 986 /* 987 * Beyond this point, we should call in6_purgeaddr upon an error, 988 * not just go to unlink. 989 */ 990 991 #if 0 /* disable this mechanism for now */ 992 /* update prefix list */ 993 if (hostIsNew && 994 (ifra->ifra_flags & IN6_IFF_NOPFX) == 0) { /* XXX */ 995 int iilen; 996 997 iilen = (sizeof(ia->ia_prefixmask.sin6_addr) << 3) - plen; 998 if ((error = in6_prefix_add_ifid(iilen, ia)) != 0) { 999 in6_purgeaddr((struct ifaddr *)ia); 1000 return (error); 1001 } 1002 } 1003 #endif 1004 1005 if (ifp->if_flags & IFF_MULTICAST) { 1006 struct sockaddr_in6 mltaddr, mltmask; 1007 struct in6_multi *in6m; 1008 1009 if (hostIsNew) { 1010 /* 1011 * join solicited multicast addr for new host id 1012 */ 1013 struct in6_addr llsol; 1014 bzero(&llsol, sizeof(struct in6_addr)); 1015 llsol.s6_addr16[0] = htons(0xff02); 1016 llsol.s6_addr16[1] = htons(ifp->if_index); 1017 llsol.s6_addr32[1] = 0; 1018 llsol.s6_addr32[2] = htonl(1); 1019 llsol.s6_addr32[3] = 1020 ifra->ifra_addr.sin6_addr.s6_addr32[3]; 1021 llsol.s6_addr8[12] = 0xff; 1022 in6_addmulti(&llsol, ifp, &error); 1023 if (error != 0) { 1024 log(LOG_WARNING, 1025 "in6_update_ifa: addmulti failed for " 1026 "%s on %s (errno=%d)\n", 1027 ip6_sprintf(&llsol), if_name(ifp), 1028 error); 1029 in6_purgeaddr((struct ifaddr *)ia); 1030 return (error); 1031 } 1032 } 1033 1034 bzero(&mltmask, sizeof(mltmask)); 1035 mltmask.sin6_len = sizeof(struct sockaddr_in6); 1036 mltmask.sin6_family = AF_INET6; 1037 mltmask.sin6_addr = in6mask32; 1038 1039 /* 1040 * join link-local all-nodes address 1041 */ 1042 bzero(&mltaddr, sizeof(mltaddr)); 1043 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 1044 mltaddr.sin6_family = AF_INET6; 1045 mltaddr.sin6_addr = kin6addr_linklocal_allnodes; 1046 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1047 1048 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1049 if (in6m == NULL) { 1050 rtrequest_global(RTM_ADD, 1051 (struct sockaddr *)&mltaddr, 1052 (struct sockaddr *)&ia->ia_addr, 1053 (struct sockaddr *)&mltmask, 1054 RTF_UP|RTF_CLONING); /* xxx */ 1055 in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 1056 if (error != 0) { 1057 log(LOG_WARNING, 1058 "in6_update_ifa: addmulti failed for " 1059 "%s on %s (errno=%d)\n", 1060 ip6_sprintf(&mltaddr.sin6_addr), 1061 if_name(ifp), error); 1062 } 1063 } 1064 1065 /* 1066 * join node information group address 1067 */ 1068 #define hostnamelen strlen(hostname) 1069 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr.sin6_addr) 1070 == 0) { 1071 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1072 if (in6m == NULL && ia != NULL) { 1073 in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 1074 if (error != 0) { 1075 log(LOG_WARNING, "in6_update_ifa: " 1076 "addmulti failed for " 1077 "%s on %s (errno=%d)\n", 1078 ip6_sprintf(&mltaddr.sin6_addr), 1079 if_name(ifp), error); 1080 } 1081 } 1082 } 1083 #undef hostnamelen 1084 1085 /* 1086 * join node-local all-nodes address, on loopback. 1087 * XXX: since "node-local" is obsoleted by interface-local, 1088 * we have to join the group on every interface with 1089 * some interface-boundary restriction. 1090 */ 1091 if (ifp->if_flags & IFF_LOOPBACK) { 1092 struct in6_ifaddr *ia_loop; 1093 1094 struct in6_addr loop6 = kin6addr_loopback; 1095 ia_loop = in6ifa_ifpwithaddr(ifp, &loop6); 1096 1097 mltaddr.sin6_addr = kin6addr_nodelocal_allnodes; 1098 1099 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1100 if (in6m == NULL && ia_loop != NULL) { 1101 rtrequest_global(RTM_ADD, 1102 (struct sockaddr *)&mltaddr, 1103 (struct sockaddr *)&ia_loop->ia_addr, 1104 (struct sockaddr *)&mltmask, 1105 RTF_UP); 1106 in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 1107 if (error != 0) { 1108 log(LOG_WARNING, "in6_update_ifa: " 1109 "addmulti failed for %s on %s " 1110 "(errno=%d)\n", 1111 ip6_sprintf(&mltaddr.sin6_addr), 1112 if_name(ifp), error); 1113 } 1114 } 1115 } 1116 } 1117 1118 ia->ia6_flags = ifra->ifra_flags; 1119 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /*safety*/ 1120 ia->ia6_flags &= ~IN6_IFF_NODAD; /* Mobile IPv6 */ 1121 1122 ia->ia6_lifetime = ifra->ifra_lifetime; 1123 /* for sanity */ 1124 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1125 ia->ia6_lifetime.ia6t_expire = 1126 time_second + ia->ia6_lifetime.ia6t_vltime; 1127 } else 1128 ia->ia6_lifetime.ia6t_expire = 0; 1129 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1130 ia->ia6_lifetime.ia6t_preferred = 1131 time_second + ia->ia6_lifetime.ia6t_pltime; 1132 } else 1133 ia->ia6_lifetime.ia6t_preferred = 0; 1134 1135 /* 1136 * Perform DAD, if needed. 1137 * XXX It may be of use, if we can administratively 1138 * disable DAD. 1139 */ 1140 if (in6if_do_dad(ifp) && !(ifra->ifra_flags & IN6_IFF_NODAD)) { 1141 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1142 nd6_dad_start((struct ifaddr *)ia, NULL); 1143 } 1144 1145 return (error); 1146 1147 unlink: 1148 /* 1149 * XXX: if a change of an existing address failed, keep the entry 1150 * anyway. 1151 */ 1152 if (hostIsNew) 1153 in6_unlink_ifa(ia, ifp); 1154 return (error); 1155 } 1156 1157 void 1158 in6_purgeaddr(struct ifaddr *ifa) 1159 { 1160 struct ifnet *ifp = ifa->ifa_ifp; 1161 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1162 1163 /* stop DAD processing */ 1164 nd6_dad_stop(ifa); 1165 1166 /* 1167 * delete route to the destination of the address being purged. 1168 * The interface must be p2p or loopback in this case. 1169 */ 1170 if ((ia->ia_flags & IFA_ROUTE) && ia->ia_dstaddr.sin6_len != 0) { 1171 int e; 1172 1173 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 1174 != 0) { 1175 log(LOG_ERR, "in6_purgeaddr: failed to remove " 1176 "a route to the p2p destination: %s on %s, " 1177 "errno=%d\n", 1178 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp), 1179 e); 1180 /* proceed anyway... */ 1181 } 1182 else 1183 ia->ia_flags &= ~IFA_ROUTE; 1184 } 1185 1186 /* Remove ownaddr's loopback rtentry, if it exists. */ 1187 in6_ifremloop(&(ia->ia_ifa)); 1188 1189 if (ifp->if_flags & IFF_MULTICAST) { 1190 /* 1191 * delete solicited multicast addr for deleting host id 1192 */ 1193 struct in6_multi *in6m; 1194 struct in6_addr llsol; 1195 bzero(&llsol, sizeof(struct in6_addr)); 1196 llsol.s6_addr16[0] = htons(0xff02); 1197 llsol.s6_addr16[1] = htons(ifp->if_index); 1198 llsol.s6_addr32[1] = 0; 1199 llsol.s6_addr32[2] = htonl(1); 1200 llsol.s6_addr32[3] = 1201 ia->ia_addr.sin6_addr.s6_addr32[3]; 1202 llsol.s6_addr8[12] = 0xff; 1203 1204 IN6_LOOKUP_MULTI(llsol, ifp, in6m); 1205 if (in6m) 1206 in6_delmulti(in6m); 1207 } 1208 1209 in6_unlink_ifa(ia, ifp); 1210 } 1211 1212 static void 1213 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1214 { 1215 int plen, iilen; 1216 struct in6_ifaddr *oia; 1217 1218 crit_enter(); 1219 1220 TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list); 1221 1222 oia = ia; 1223 if (oia == (ia = in6_ifaddr)) 1224 in6_ifaddr = ia->ia_next; 1225 else { 1226 while (ia->ia_next && (ia->ia_next != oia)) 1227 ia = ia->ia_next; 1228 if (ia->ia_next) 1229 ia->ia_next = oia->ia_next; 1230 else { 1231 /* search failed */ 1232 kprintf("Couldn't unlink in6_ifaddr from in6_ifaddr\n"); 1233 } 1234 } 1235 1236 if (oia->ia6_ifpr) { /* check for safety */ 1237 plen = in6_mask2len(&oia->ia_prefixmask.sin6_addr, NULL); 1238 iilen = (sizeof(oia->ia_prefixmask.sin6_addr) << 3) - plen; 1239 in6_prefix_remove_ifid(iilen, oia); 1240 } 1241 1242 /* 1243 * When an autoconfigured address is being removed, release the 1244 * reference to the base prefix. Also, since the release might 1245 * affect the status of other (detached) addresses, call 1246 * pfxlist_onlink_check(). 1247 */ 1248 if (oia->ia6_flags & IN6_IFF_AUTOCONF) { 1249 if (oia->ia6_ndpr == NULL) { 1250 log(LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address " 1251 "%p has no prefix\n", oia); 1252 } else { 1253 oia->ia6_ndpr->ndpr_refcnt--; 1254 oia->ia6_flags &= ~IN6_IFF_AUTOCONF; 1255 oia->ia6_ndpr = NULL; 1256 } 1257 1258 pfxlist_onlink_check(); 1259 } 1260 1261 /* 1262 * release another refcnt for the link from in6_ifaddr. 1263 * Note that we should decrement the refcnt at least once for all *BSD. 1264 */ 1265 IFAFREE(&oia->ia_ifa); 1266 1267 crit_exit(); 1268 } 1269 1270 void 1271 in6_purgeif(struct ifnet *ifp) 1272 { 1273 struct ifaddr *ifa, *nifa; 1274 1275 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa) 1276 { 1277 nifa = TAILQ_NEXT(ifa, ifa_list); 1278 if (ifa->ifa_addr->sa_family != AF_INET6) 1279 continue; 1280 in6_purgeaddr(ifa); 1281 } 1282 1283 in6_ifdetach(ifp); 1284 } 1285 1286 /* 1287 * SIOC[GAD]LIFADDR. 1288 * SIOCGLIFADDR: get first address. (?) 1289 * SIOCGLIFADDR with IFLR_PREFIX: 1290 * get first address that matches the specified prefix. 1291 * SIOCALIFADDR: add the specified address. 1292 * SIOCALIFADDR with IFLR_PREFIX: 1293 * add the specified prefix, filling hostid part from 1294 * the first link-local address. prefixlen must be <= 64. 1295 * SIOCDLIFADDR: delete the specified address. 1296 * SIOCDLIFADDR with IFLR_PREFIX: 1297 * delete the first address that matches the specified prefix. 1298 * return values: 1299 * EINVAL on invalid parameters 1300 * EADDRNOTAVAIL on prefix match failed/specified address not found 1301 * other values may be returned from in6_ioctl() 1302 * 1303 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1304 * this is to accomodate address naming scheme other than RFC2374, 1305 * in the future. 1306 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1307 * address encoding scheme. (see figure on page 8) 1308 */ 1309 static int 1310 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 1311 struct ifnet *ifp, struct thread *td) 1312 { 1313 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1314 struct ifaddr *ifa; 1315 struct sockaddr *sa; 1316 1317 /* sanity checks */ 1318 if (!data || !ifp) { 1319 panic("invalid argument to in6_lifaddr_ioctl"); 1320 /*NOTRECHED*/ 1321 } 1322 1323 switch (cmd) { 1324 case SIOCGLIFADDR: 1325 /* address must be specified on GET with IFLR_PREFIX */ 1326 if (!(iflr->flags & IFLR_PREFIX)) 1327 break; 1328 /* FALLTHROUGH */ 1329 case SIOCALIFADDR: 1330 case SIOCDLIFADDR: 1331 /* address must be specified on ADD and DELETE */ 1332 sa = (struct sockaddr *)&iflr->addr; 1333 if (sa->sa_family != AF_INET6) 1334 return EINVAL; 1335 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1336 return EINVAL; 1337 /* XXX need improvement */ 1338 sa = (struct sockaddr *)&iflr->dstaddr; 1339 if (sa->sa_family && sa->sa_family != AF_INET6) 1340 return EINVAL; 1341 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1342 return EINVAL; 1343 break; 1344 default: /* shouldn't happen */ 1345 #if 0 1346 panic("invalid cmd to in6_lifaddr_ioctl"); 1347 /* NOTREACHED */ 1348 #else 1349 return EOPNOTSUPP; 1350 #endif 1351 } 1352 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) 1353 return EINVAL; 1354 1355 switch (cmd) { 1356 case SIOCALIFADDR: 1357 { 1358 struct in6_aliasreq ifra; 1359 struct in6_addr *hostid = NULL; 1360 int prefixlen; 1361 1362 if (iflr->flags & IFLR_PREFIX) { 1363 struct sockaddr_in6 *sin6; 1364 1365 /* 1366 * hostid is to fill in the hostid part of the 1367 * address. hostid points to the first link-local 1368 * address attached to the interface. 1369 */ 1370 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1371 if (!ifa) 1372 return EADDRNOTAVAIL; 1373 hostid = IFA_IN6(ifa); 1374 1375 /* prefixlen must be <= 64. */ 1376 if (64 < iflr->prefixlen) 1377 return EINVAL; 1378 prefixlen = iflr->prefixlen; 1379 1380 /* hostid part must be zero. */ 1381 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1382 if (sin6->sin6_addr.s6_addr32[2] != 0 1383 || sin6->sin6_addr.s6_addr32[3] != 0) { 1384 return EINVAL; 1385 } 1386 } else 1387 prefixlen = iflr->prefixlen; 1388 1389 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1390 bzero(&ifra, sizeof(ifra)); 1391 bcopy(iflr->iflr_name, ifra.ifra_name, 1392 sizeof(ifra.ifra_name)); 1393 1394 bcopy(&iflr->addr, &ifra.ifra_addr, 1395 ((struct sockaddr *)&iflr->addr)->sa_len); 1396 if (hostid) { 1397 /* fill in hostid part */ 1398 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1399 hostid->s6_addr32[2]; 1400 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1401 hostid->s6_addr32[3]; 1402 } 1403 1404 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/ 1405 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1406 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1407 if (hostid) { 1408 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1409 hostid->s6_addr32[2]; 1410 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1411 hostid->s6_addr32[3]; 1412 } 1413 } 1414 1415 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1416 in6_len2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1417 1418 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1419 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td); 1420 } 1421 case SIOCGLIFADDR: 1422 case SIOCDLIFADDR: 1423 { 1424 struct in6_ifaddr *ia; 1425 struct in6_addr mask, candidate, match; 1426 struct sockaddr_in6 *sin6; 1427 int cmp; 1428 1429 bzero(&mask, sizeof(mask)); 1430 if (iflr->flags & IFLR_PREFIX) { 1431 /* lookup a prefix rather than address. */ 1432 in6_len2mask(&mask, iflr->prefixlen); 1433 1434 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1435 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1436 match.s6_addr32[0] &= mask.s6_addr32[0]; 1437 match.s6_addr32[1] &= mask.s6_addr32[1]; 1438 match.s6_addr32[2] &= mask.s6_addr32[2]; 1439 match.s6_addr32[3] &= mask.s6_addr32[3]; 1440 1441 /* if you set extra bits, that's wrong */ 1442 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1443 return EINVAL; 1444 1445 cmp = 1; 1446 } else { 1447 if (cmd == SIOCGLIFADDR) { 1448 /* on getting an address, take the 1st match */ 1449 cmp = 0; /* XXX */ 1450 } else { 1451 /* on deleting an address, do exact match */ 1452 in6_len2mask(&mask, 128); 1453 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1454 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1455 1456 cmp = 1; 1457 } 1458 } 1459 1460 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1461 { 1462 if (ifa->ifa_addr->sa_family != AF_INET6) 1463 continue; 1464 if (!cmp) 1465 break; 1466 1467 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1468 /* 1469 * XXX: this is adhoc, but is necessary to allow 1470 * a user to specify fe80::/64 (not /10) for a 1471 * link-local address. 1472 */ 1473 if (IN6_IS_ADDR_LINKLOCAL(&candidate)) 1474 candidate.s6_addr16[1] = 0; 1475 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1476 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1477 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1478 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1479 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1480 break; 1481 } 1482 if (!ifa) 1483 return EADDRNOTAVAIL; 1484 ia = ifa2ia6(ifa); 1485 1486 if (cmd == SIOCGLIFADDR) { 1487 struct sockaddr_in6 *s6; 1488 1489 /* fill in the if_laddrreq structure */ 1490 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1491 s6 = (struct sockaddr_in6 *)&iflr->addr; 1492 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) { 1493 s6->sin6_addr.s6_addr16[1] = 0; 1494 s6->sin6_scope_id = 1495 in6_addr2scopeid(ifp, &s6->sin6_addr); 1496 } 1497 if (ifp->if_flags & IFF_POINTOPOINT) { 1498 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1499 ia->ia_dstaddr.sin6_len); 1500 s6 = (struct sockaddr_in6 *)&iflr->dstaddr; 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, 1505 &s6->sin6_addr); 1506 } 1507 } else 1508 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1509 1510 iflr->prefixlen = 1511 in6_mask2len(&ia->ia_prefixmask.sin6_addr, 1512 NULL); 1513 1514 iflr->flags = ia->ia6_flags; /* XXX */ 1515 1516 return 0; 1517 } else { 1518 struct in6_aliasreq ifra; 1519 1520 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1521 bzero(&ifra, sizeof(ifra)); 1522 bcopy(iflr->iflr_name, ifra.ifra_name, 1523 sizeof(ifra.ifra_name)); 1524 1525 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1526 ia->ia_addr.sin6_len); 1527 if (ifp->if_flags & IFF_POINTOPOINT) 1528 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1529 ia->ia_dstaddr.sin6_len); 1530 else 1531 bzero(&ifra.ifra_dstaddr, 1532 sizeof(ifra.ifra_dstaddr)); 1533 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1534 ia->ia_prefixmask.sin6_len); 1535 1536 ifra.ifra_flags = ia->ia6_flags; 1537 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, 1538 ifp, td); 1539 } 1540 } 1541 } 1542 1543 return EOPNOTSUPP; /* just for safety */ 1544 } 1545 1546 /* 1547 * Initialize an interface's intetnet6 address 1548 * and routing table entry. 1549 */ 1550 static int 1551 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, struct sockaddr_in6 *sin6, 1552 int newhost) 1553 { 1554 int error = 0, plen, ifacount = 0; 1555 struct ifaddr *ifa; 1556 1557 lwkt_serialize_enter(ifp->if_serializer); 1558 1559 /* 1560 * Give the interface a chance to initialize 1561 * if this is its first address, 1562 * and to validate the address if necessary. 1563 */ 1564 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1565 { 1566 if (ifa->ifa_addr == NULL) 1567 continue; /* just for safety */ 1568 if (ifa->ifa_addr->sa_family != AF_INET6) 1569 continue; 1570 ifacount++; 1571 } 1572 1573 ia->ia_addr = *sin6; 1574 1575 if (ifacount <= 1 && ifp->if_ioctl && 1576 (error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, 1577 (struct ucred *)NULL))) { 1578 lwkt_serialize_exit(ifp->if_serializer); 1579 return (error); 1580 } 1581 lwkt_serialize_exit(ifp->if_serializer); 1582 1583 ia->ia_ifa.ifa_metric = ifp->if_metric; 1584 1585 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1586 1587 /* 1588 * Special case: 1589 * If the destination address is specified for a point-to-point 1590 * interface, install a route to the destination as an interface 1591 * direct route. 1592 */ 1593 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1594 if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) { 1595 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, 1596 RTF_UP | RTF_HOST)) != 0) 1597 return (error); 1598 ia->ia_flags |= IFA_ROUTE; 1599 } 1600 if (plen < 128) { 1601 /* 1602 * The RTF_CLONING flag is necessary for in6_is_ifloop_auto(). 1603 */ 1604 ia->ia_ifa.ifa_flags |= RTF_CLONING; 1605 } 1606 1607 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1608 if (newhost) { 1609 /* set the rtrequest function to create llinfo */ 1610 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1611 in6_ifaddloop(&(ia->ia_ifa)); 1612 } 1613 1614 return (error); 1615 } 1616 1617 struct in6_multi_mship * 1618 in6_joingroup(ifp, addr, errorp) 1619 struct ifnet *ifp; 1620 struct in6_addr *addr; 1621 int *errorp; 1622 { 1623 struct in6_multi_mship *imm; 1624 1625 imm = kmalloc(sizeof(*imm), M_IPMADDR, M_NOWAIT); 1626 if (!imm) { 1627 *errorp = ENOBUFS; 1628 return NULL; 1629 } 1630 imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp); 1631 if (!imm->i6mm_maddr) { 1632 /* *errorp is alrady set */ 1633 kfree(imm, M_IPMADDR); 1634 return NULL; 1635 } 1636 return imm; 1637 } 1638 1639 int 1640 in6_leavegroup(imm) 1641 struct in6_multi_mship *imm; 1642 { 1643 1644 if (imm->i6mm_maddr) 1645 in6_delmulti(imm->i6mm_maddr); 1646 kfree(imm, M_IPMADDR); 1647 return 0; 1648 } 1649 1650 /* 1651 * Add an address to the list of IP6 multicast addresses for a 1652 * given interface. 1653 */ 1654 struct in6_multi * 1655 in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp, int *errorp) 1656 { 1657 struct in6_multi *in6m; 1658 struct sockaddr_in6 sin6; 1659 struct ifmultiaddr *ifma; 1660 1661 *errorp = 0; 1662 1663 crit_enter(); 1664 1665 /* 1666 * Call generic routine to add membership or increment 1667 * refcount. It wants addresses in the form of a sockaddr, 1668 * so we build one here (being careful to zero the unused bytes). 1669 */ 1670 bzero(&sin6, sizeof sin6); 1671 sin6.sin6_family = AF_INET6; 1672 sin6.sin6_len = sizeof sin6; 1673 sin6.sin6_addr = *maddr6; 1674 *errorp = if_addmulti(ifp, (struct sockaddr *)&sin6, &ifma); 1675 if (*errorp) { 1676 crit_exit(); 1677 return 0; 1678 } 1679 1680 /* 1681 * If ifma->ifma_protospec is null, then if_addmulti() created 1682 * a new record. Otherwise, we are done. 1683 */ 1684 if (ifma->ifma_protospec != 0) { 1685 crit_exit(); 1686 return ifma->ifma_protospec; 1687 } 1688 1689 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 1690 at interrupt time? If so, need to fix if_addmulti. XXX */ 1691 in6m = (struct in6_multi *)kmalloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT); 1692 if (in6m == NULL) { 1693 crit_exit(); 1694 return (NULL); 1695 } 1696 1697 bzero(in6m, sizeof *in6m); 1698 in6m->in6m_addr = *maddr6; 1699 in6m->in6m_ifp = ifp; 1700 in6m->in6m_ifma = ifma; 1701 ifma->ifma_protospec = in6m; 1702 LIST_INSERT_HEAD(&in6_multihead, in6m, in6m_entry); 1703 1704 /* 1705 * Let MLD6 know that we have joined a new IP6 multicast 1706 * group. 1707 */ 1708 mld6_start_listening(in6m); 1709 crit_exit(); 1710 return (in6m); 1711 } 1712 1713 /* 1714 * Delete a multicast address record. 1715 */ 1716 void 1717 in6_delmulti(struct in6_multi *in6m) 1718 { 1719 struct ifmultiaddr *ifma = in6m->in6m_ifma; 1720 1721 crit_enter(); 1722 1723 if (ifma->ifma_refcount == 1) { 1724 /* 1725 * No remaining claims to this record; let MLD6 know 1726 * that we are leaving the multicast group. 1727 */ 1728 mld6_stop_listening(in6m); 1729 ifma->ifma_protospec = 0; 1730 LIST_REMOVE(in6m, in6m_entry); 1731 kfree(in6m, M_IPMADDR); 1732 } 1733 /* XXX - should be separate API for when we have an ifma? */ 1734 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1735 crit_exit(); 1736 } 1737 1738 /* 1739 * Find an IPv6 interface link-local address specific to an interface. 1740 */ 1741 struct in6_ifaddr * 1742 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1743 { 1744 struct ifaddr *ifa; 1745 1746 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1747 { 1748 if (ifa->ifa_addr == NULL) 1749 continue; /* just for safety */ 1750 if (ifa->ifa_addr->sa_family != AF_INET6) 1751 continue; 1752 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1753 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1754 ignoreflags) != 0) 1755 continue; 1756 break; 1757 } 1758 } 1759 1760 return ((struct in6_ifaddr *)ifa); 1761 } 1762 1763 1764 /* 1765 * find the internet address corresponding to a given interface and address. 1766 */ 1767 struct in6_ifaddr * 1768 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr) 1769 { 1770 struct ifaddr *ifa; 1771 1772 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1773 { 1774 if (ifa->ifa_addr == NULL) 1775 continue; /* just for safety */ 1776 if (ifa->ifa_addr->sa_family != AF_INET6) 1777 continue; 1778 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1779 break; 1780 } 1781 1782 return ((struct in6_ifaddr *)ifa); 1783 } 1784 1785 /* 1786 * Convert IP6 address to printable (loggable) representation. 1787 */ 1788 static char digits[] = "0123456789abcdef"; 1789 static int ip6round = 0; 1790 char * 1791 ip6_sprintf(const struct in6_addr *addr) 1792 { 1793 static char ip6buf[8][48]; 1794 int i; 1795 char *cp; 1796 const u_short *a = (const u_short *)addr; 1797 const u_char *d; 1798 int dcolon = 0; 1799 1800 ip6round = (ip6round + 1) & 7; 1801 cp = ip6buf[ip6round]; 1802 1803 for (i = 0; i < 8; i++) { 1804 if (dcolon == 1) { 1805 if (*a == 0) { 1806 if (i == 7) 1807 *cp++ = ':'; 1808 a++; 1809 continue; 1810 } else 1811 dcolon = 2; 1812 } 1813 if (*a == 0) { 1814 if (dcolon == 0 && *(a + 1) == 0) { 1815 if (i == 0) 1816 *cp++ = ':'; 1817 *cp++ = ':'; 1818 dcolon = 1; 1819 } else { 1820 *cp++ = '0'; 1821 *cp++ = ':'; 1822 } 1823 a++; 1824 continue; 1825 } 1826 d = (const u_char *)a; 1827 *cp++ = digits[*d >> 4]; 1828 *cp++ = digits[*d++ & 0xf]; 1829 *cp++ = digits[*d >> 4]; 1830 *cp++ = digits[*d & 0xf]; 1831 *cp++ = ':'; 1832 a++; 1833 } 1834 *--cp = 0; 1835 return (ip6buf[ip6round]); 1836 } 1837 1838 int 1839 in6_localaddr(struct in6_addr *in6) 1840 { 1841 struct in6_ifaddr *ia; 1842 1843 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1844 return 1; 1845 1846 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 1847 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1848 &ia->ia_prefixmask.sin6_addr)) 1849 return 1; 1850 1851 return (0); 1852 } 1853 1854 int 1855 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1856 { 1857 struct in6_ifaddr *ia; 1858 1859 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1860 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1861 &sa6->sin6_addr) && 1862 (ia->ia6_flags & IN6_IFF_DEPRECATED)) 1863 return (1); /* true */ 1864 1865 /* XXX: do we still have to go thru the rest of the list? */ 1866 } 1867 1868 return (0); /* false */ 1869 } 1870 1871 /* 1872 * return length of part which dst and src are equal 1873 * hard coding... 1874 */ 1875 int 1876 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1877 { 1878 int match = 0; 1879 u_char *s = (u_char *)src, *d = (u_char *)dst; 1880 u_char *lim = s + 16, r; 1881 1882 while (s < lim) 1883 if ((r = (*d++ ^ *s++)) != 0) { 1884 while (r < 128) { 1885 match++; 1886 r <<= 1; 1887 } 1888 break; 1889 } else 1890 match += 8; 1891 return match; 1892 } 1893 1894 /* XXX: to be scope conscious */ 1895 int 1896 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1897 { 1898 int bytelen, bitlen; 1899 1900 /* sanity check */ 1901 if (0 > len || len > 128) { 1902 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1903 len); 1904 return (0); 1905 } 1906 1907 bytelen = len / 8; 1908 bitlen = len % 8; 1909 1910 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1911 return (0); 1912 if (p1->s6_addr[bytelen] >> (8 - bitlen) != 1913 p2->s6_addr[bytelen] >> (8 - bitlen)) 1914 return (0); 1915 1916 return (1); 1917 } 1918 1919 void 1920 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1921 { 1922 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1923 int bytelen, bitlen, i; 1924 1925 /* sanity check */ 1926 if (0 > len || len > 128) { 1927 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1928 len); 1929 return; 1930 } 1931 1932 bzero(maskp, sizeof(*maskp)); 1933 bytelen = len / 8; 1934 bitlen = len % 8; 1935 for (i = 0; i < bytelen; i++) 1936 maskp->s6_addr[i] = 0xff; 1937 if (bitlen) 1938 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1939 } 1940 1941 /* 1942 * return the best address out of the same scope 1943 */ 1944 struct in6_ifaddr * 1945 in6_ifawithscope(struct ifnet *oifp, struct in6_addr *dst) 1946 { 1947 int dst_scope = in6_addrscope(dst), src_scope, best_scope = 0; 1948 int blen = -1; 1949 struct ifaddr *ifa; 1950 struct ifnet *ifp; 1951 struct in6_ifaddr *ifa_best = NULL; 1952 1953 if (oifp == NULL) { 1954 #if 0 1955 kprintf("in6_ifawithscope: output interface is not specified\n"); 1956 #endif 1957 return (NULL); 1958 } 1959 1960 /* 1961 * We search for all addresses on all interfaces from the beginning. 1962 * Comparing an interface with the outgoing interface will be done 1963 * only at the final stage of tiebreaking. 1964 */ 1965 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1966 { 1967 /* 1968 * We can never take an address that breaks the scope zone 1969 * of the destination. 1970 */ 1971 if (in6_addr2scopeid(ifp, dst) != in6_addr2scopeid(oifp, dst)) 1972 continue; 1973 1974 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1975 { 1976 int tlen = -1, dscopecmp, bscopecmp, matchcmp; 1977 1978 if (ifa->ifa_addr->sa_family != AF_INET6) 1979 continue; 1980 1981 src_scope = in6_addrscope(IFA_IN6(ifa)); 1982 1983 /* 1984 * Don't use an address before completing DAD 1985 * nor a duplicated address. 1986 */ 1987 if (((struct in6_ifaddr *)ifa)->ia6_flags & 1988 IN6_IFF_NOTREADY) 1989 continue; 1990 1991 /* XXX: is there any case to allow anycasts? */ 1992 if (((struct in6_ifaddr *)ifa)->ia6_flags & 1993 IN6_IFF_ANYCAST) 1994 continue; 1995 1996 if (((struct in6_ifaddr *)ifa)->ia6_flags & 1997 IN6_IFF_DETACHED) 1998 continue; 1999 2000 /* 2001 * If this is the first address we find, 2002 * keep it anyway. 2003 */ 2004 if (ifa_best == NULL) 2005 goto replace; 2006 2007 /* 2008 * ifa_best is never NULL beyond this line except 2009 * within the block labeled "replace". 2010 */ 2011 2012 /* 2013 * If ifa_best has a smaller scope than dst and 2014 * the current address has a larger one than 2015 * (or equal to) dst, always replace ifa_best. 2016 * Also, if the current address has a smaller scope 2017 * than dst, ignore it unless ifa_best also has a 2018 * smaller scope. 2019 * Consequently, after the two if-clause below, 2020 * the followings must be satisfied: 2021 * (scope(src) < scope(dst) && 2022 * scope(best) < scope(dst)) 2023 * OR 2024 * (scope(best) >= scope(dst) && 2025 * scope(src) >= scope(dst)) 2026 */ 2027 if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0 && 2028 IN6_ARE_SCOPE_CMP(src_scope, dst_scope) >= 0) 2029 goto replace; /* (A) */ 2030 if (IN6_ARE_SCOPE_CMP(src_scope, dst_scope) < 0 && 2031 IN6_ARE_SCOPE_CMP(best_scope, dst_scope) >= 0) 2032 continue; /* (B) */ 2033 2034 /* 2035 * A deprecated address SHOULD NOT be used in new 2036 * communications if an alternate (non-deprecated) 2037 * address is available and has sufficient scope. 2038 * RFC 2462, Section 5.5.4. 2039 */ 2040 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2041 IN6_IFF_DEPRECATED) { 2042 /* 2043 * Ignore any deprecated addresses if 2044 * specified by configuration. 2045 */ 2046 if (!ip6_use_deprecated) 2047 continue; 2048 2049 /* 2050 * If we have already found a non-deprecated 2051 * candidate, just ignore deprecated addresses. 2052 */ 2053 if (!(ifa_best->ia6_flags & IN6_IFF_DEPRECATED)) 2054 continue; 2055 } 2056 2057 /* 2058 * A non-deprecated address is always preferred 2059 * to a deprecated one regardless of scopes and 2060 * address matching (Note invariants ensured by the 2061 * conditions (A) and (B) above.) 2062 */ 2063 if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) && 2064 !(((struct in6_ifaddr *)ifa)->ia6_flags & 2065 IN6_IFF_DEPRECATED)) 2066 goto replace; 2067 2068 /* 2069 * When we use temporary addresses described in 2070 * RFC 3041, we prefer temporary addresses to 2071 * public autoconf addresses. Again, note the 2072 * invariants from (A) and (B). Also note that we 2073 * don't have any preference between static addresses 2074 * and autoconf addresses (despite of whether or not 2075 * the latter is temporary or public.) 2076 */ 2077 if (ip6_use_tempaddr) { 2078 struct in6_ifaddr *ifat; 2079 2080 ifat = (struct in6_ifaddr *)ifa; 2081 if ((ifa_best->ia6_flags & 2082 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2083 == IN6_IFF_AUTOCONF && 2084 (ifat->ia6_flags & 2085 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2086 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) { 2087 goto replace; 2088 } 2089 if ((ifa_best->ia6_flags & 2090 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2091 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY) && 2092 (ifat->ia6_flags & 2093 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2094 == IN6_IFF_AUTOCONF) { 2095 continue; 2096 } 2097 } 2098 2099 /* 2100 * At this point, we have two cases: 2101 * 1. we are looking at a non-deprecated address, 2102 * and ifa_best is also non-deprecated. 2103 * 2. we are looking at a deprecated address, 2104 * and ifa_best is also deprecated. 2105 * Also, we do not have to consider a case where 2106 * the scope of if_best is larger(smaller) than dst and 2107 * the scope of the current address is smaller(larger) 2108 * than dst. Such a case has already been covered. 2109 * Tiebreaking is done according to the following 2110 * items: 2111 * - the scope comparison between the address and 2112 * dst (dscopecmp) 2113 * - the scope comparison between the address and 2114 * ifa_best (bscopecmp) 2115 * - if the address match dst longer than ifa_best 2116 * (matchcmp) 2117 * - if the address is on the outgoing I/F (outI/F) 2118 * 2119 * Roughly speaking, the selection policy is 2120 * - the most important item is scope. The same scope 2121 * is best. Then search for a larger scope. 2122 * Smaller scopes are the last resort. 2123 * - A deprecated address is chosen only when we have 2124 * no address that has an enough scope, but is 2125 * prefered to any addresses of smaller scopes 2126 * (this must be already done above.) 2127 * - addresses on the outgoing I/F are preferred to 2128 * ones on other interfaces if none of above 2129 * tiebreaks. In the table below, the column "bI" 2130 * means if the best_ifa is on the outgoing 2131 * interface, and the column "sI" means if the ifa 2132 * is on the outgoing interface. 2133 * - If there is no other reasons to choose one, 2134 * longest address match against dst is considered. 2135 * 2136 * The precise decision table is as follows: 2137 * dscopecmp bscopecmp match bI oI | replace? 2138 * N/A equal N/A Y N | No (1) 2139 * N/A equal N/A N Y | Yes (2) 2140 * N/A equal larger N/A | Yes (3) 2141 * N/A equal !larger N/A | No (4) 2142 * larger larger N/A N/A | No (5) 2143 * larger smaller N/A N/A | Yes (6) 2144 * smaller larger N/A N/A | Yes (7) 2145 * smaller smaller N/A N/A | No (8) 2146 * equal smaller N/A N/A | Yes (9) 2147 * equal larger (already done at A above) 2148 */ 2149 dscopecmp = IN6_ARE_SCOPE_CMP(src_scope, dst_scope); 2150 bscopecmp = IN6_ARE_SCOPE_CMP(src_scope, best_scope); 2151 2152 if (bscopecmp == 0) { 2153 struct ifnet *bifp = ifa_best->ia_ifp; 2154 2155 if (bifp == oifp && ifp != oifp) /* (1) */ 2156 continue; 2157 if (bifp != oifp && ifp == oifp) /* (2) */ 2158 goto replace; 2159 2160 /* 2161 * Both bifp and ifp are on the outgoing 2162 * interface, or both two are on a different 2163 * interface from the outgoing I/F. 2164 * now we need address matching against dst 2165 * for tiebreaking. 2166 */ 2167 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2168 matchcmp = tlen - blen; 2169 if (matchcmp > 0) /* (3) */ 2170 goto replace; 2171 continue; /* (4) */ 2172 } 2173 if (dscopecmp > 0) { 2174 if (bscopecmp > 0) /* (5) */ 2175 continue; 2176 goto replace; /* (6) */ 2177 } 2178 if (dscopecmp < 0) { 2179 if (bscopecmp > 0) /* (7) */ 2180 goto replace; 2181 continue; /* (8) */ 2182 } 2183 2184 /* now dscopecmp must be 0 */ 2185 if (bscopecmp < 0) 2186 goto replace; /* (9) */ 2187 2188 replace: 2189 ifa_best = (struct in6_ifaddr *)ifa; 2190 blen = tlen >= 0 ? tlen : 2191 in6_matchlen(IFA_IN6(ifa), dst); 2192 best_scope = in6_addrscope(&ifa_best->ia_addr.sin6_addr); 2193 } 2194 } 2195 2196 /* count statistics for future improvements */ 2197 if (ifa_best == NULL) 2198 ip6stat.ip6s_sources_none++; 2199 else { 2200 if (oifp == ifa_best->ia_ifp) 2201 ip6stat.ip6s_sources_sameif[best_scope]++; 2202 else 2203 ip6stat.ip6s_sources_otherif[best_scope]++; 2204 2205 if (best_scope == dst_scope) 2206 ip6stat.ip6s_sources_samescope[best_scope]++; 2207 else 2208 ip6stat.ip6s_sources_otherscope[best_scope]++; 2209 2210 if (ifa_best->ia6_flags & IN6_IFF_DEPRECATED) 2211 ip6stat.ip6s_sources_deprecated[best_scope]++; 2212 } 2213 2214 return (ifa_best); 2215 } 2216 2217 /* 2218 * return the best address out of the same scope. if no address was 2219 * found, return the first valid address from designated IF. 2220 */ 2221 struct in6_ifaddr * 2222 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2223 { 2224 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2225 struct ifaddr *ifa; 2226 struct in6_ifaddr *besta = 0; 2227 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2228 2229 dep[0] = dep[1] = NULL; 2230 2231 /* 2232 * We first look for addresses in the same scope. 2233 * If there is one, return it. 2234 * If two or more, return one which matches the dst longest. 2235 * If none, return one of global addresses assigned other ifs. 2236 */ 2237 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 2238 { 2239 if (ifa->ifa_addr->sa_family != AF_INET6) 2240 continue; 2241 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2242 continue; /* XXX: is there any case to allow anycast? */ 2243 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2244 continue; /* don't use this interface */ 2245 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2246 continue; 2247 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2248 if (ip6_use_deprecated) 2249 dep[0] = (struct in6_ifaddr *)ifa; 2250 continue; 2251 } 2252 2253 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2254 /* 2255 * call in6_matchlen() as few as possible 2256 */ 2257 if (besta) { 2258 if (blen == -1) 2259 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2260 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2261 if (tlen > blen) { 2262 blen = tlen; 2263 besta = (struct in6_ifaddr *)ifa; 2264 } 2265 } else 2266 besta = (struct in6_ifaddr *)ifa; 2267 } 2268 } 2269 if (besta) 2270 return (besta); 2271 2272 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 2273 { 2274 if (ifa->ifa_addr->sa_family != AF_INET6) 2275 continue; 2276 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2277 continue; /* XXX: is there any case to allow anycast? */ 2278 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2279 continue; /* don't use this interface */ 2280 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2281 continue; 2282 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2283 if (ip6_use_deprecated) 2284 dep[1] = (struct in6_ifaddr *)ifa; 2285 continue; 2286 } 2287 2288 return (struct in6_ifaddr *)ifa; 2289 } 2290 2291 /* use the last-resort values, that are, deprecated addresses */ 2292 if (dep[0]) 2293 return dep[0]; 2294 if (dep[1]) 2295 return dep[1]; 2296 2297 return NULL; 2298 } 2299 2300 /* 2301 * perform DAD when interface becomes IFF_UP. 2302 */ 2303 void 2304 in6_if_up(struct ifnet *ifp) 2305 { 2306 struct ifaddr *ifa; 2307 struct in6_ifaddr *ia; 2308 int dad_delay; /* delay ticks before DAD output */ 2309 2310 /* 2311 * special cases, like 6to4, are handled in in6_ifattach 2312 */ 2313 in6_ifattach(ifp, NULL); 2314 2315 dad_delay = 0; 2316 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 2317 { 2318 if (ifa->ifa_addr->sa_family != AF_INET6) 2319 continue; 2320 ia = (struct in6_ifaddr *)ifa; 2321 if (ia->ia6_flags & IN6_IFF_TENTATIVE) 2322 nd6_dad_start(ifa, &dad_delay); 2323 } 2324 } 2325 2326 int 2327 in6if_do_dad(struct ifnet *ifp) 2328 { 2329 if (ifp->if_flags & IFF_LOOPBACK) 2330 return (0); 2331 2332 switch (ifp->if_type) { 2333 #ifdef IFT_DUMMY 2334 case IFT_DUMMY: 2335 #endif 2336 case IFT_FAITH: 2337 /* 2338 * These interfaces do not have the IFF_LOOPBACK flag, 2339 * but loop packets back. We do not have to do DAD on such 2340 * interfaces. We should even omit it, because loop-backed 2341 * NS would confuse the DAD procedure. 2342 */ 2343 return (0); 2344 default: 2345 /* 2346 * Our DAD routine requires the interface up and running. 2347 * However, some interfaces can be up before the RUNNING 2348 * status. Additionaly, users may try to assign addresses 2349 * before the interface becomes up (or running). 2350 * We simply skip DAD in such a case as a work around. 2351 * XXX: we should rather mark "tentative" on such addresses, 2352 * and do DAD after the interface becomes ready. 2353 */ 2354 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != 2355 (IFF_UP|IFF_RUNNING)) 2356 return (0); 2357 2358 return (1); 2359 } 2360 } 2361 2362 /* 2363 * Calculate max IPv6 MTU through all the interfaces and store it 2364 * to in6_maxmtu. 2365 */ 2366 void 2367 in6_setmaxmtu(void) 2368 { 2369 unsigned long maxmtu = 0; 2370 struct ifnet *ifp; 2371 2372 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 2373 { 2374 if (!(ifp->if_flags & IFF_LOOPBACK) && 2375 ND_IFINFO(ifp)->linkmtu > maxmtu) 2376 maxmtu = ND_IFINFO(ifp)->linkmtu; 2377 } 2378 if (maxmtu) /* update only when maxmtu is positive */ 2379 in6_maxmtu = maxmtu; 2380 } 2381 2382 void * 2383 in6_domifattach(struct ifnet *ifp) 2384 { 2385 struct in6_ifextra *ext; 2386 2387 ext = (struct in6_ifextra *)kmalloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2388 bzero(ext, sizeof(*ext)); 2389 2390 ext->in6_ifstat = (struct in6_ifstat *)kmalloc(sizeof(struct in6_ifstat), 2391 M_IFADDR, M_WAITOK); 2392 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat)); 2393 2394 ext->icmp6_ifstat = 2395 (struct icmp6_ifstat *)kmalloc(sizeof(struct icmp6_ifstat), 2396 M_IFADDR, M_WAITOK); 2397 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat)); 2398 2399 ext->nd_ifinfo = nd6_ifattach(ifp); 2400 ext->scope6_id = scope6_ifattach(ifp); 2401 return ext; 2402 } 2403 2404 void 2405 in6_domifdetach(struct ifnet *ifp, void *aux) 2406 { 2407 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2408 scope6_ifdetach(ext->scope6_id); 2409 nd6_ifdetach(ext->nd_ifinfo); 2410 kfree(ext->in6_ifstat, M_IFADDR); 2411 kfree(ext->icmp6_ifstat, M_IFADDR); 2412 kfree(ext, M_IFADDR); 2413 } 2414 2415 /* 2416 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2417 * v4 mapped addr or v4 compat addr 2418 */ 2419 void 2420 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2421 { 2422 bzero(sin, sizeof(*sin)); 2423 sin->sin_len = sizeof(struct sockaddr_in); 2424 sin->sin_family = AF_INET; 2425 sin->sin_port = sin6->sin6_port; 2426 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2427 } 2428 2429 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2430 void 2431 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2432 { 2433 bzero(sin6, sizeof(*sin6)); 2434 sin6->sin6_len = sizeof(struct sockaddr_in6); 2435 sin6->sin6_family = AF_INET6; 2436 sin6->sin6_port = sin->sin_port; 2437 sin6->sin6_addr.s6_addr32[0] = 0; 2438 sin6->sin6_addr.s6_addr32[1] = 0; 2439 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2440 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2441 } 2442 2443 /* Convert sockaddr_in6 into sockaddr_in. */ 2444 void 2445 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2446 { 2447 struct sockaddr_in *sin_p; 2448 struct sockaddr_in6 sin6; 2449 2450 /* 2451 * Save original sockaddr_in6 addr and convert it 2452 * to sockaddr_in. 2453 */ 2454 sin6 = *(struct sockaddr_in6 *)nam; 2455 sin_p = (struct sockaddr_in *)nam; 2456 in6_sin6_2_sin(sin_p, &sin6); 2457 } 2458 2459 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2460 void 2461 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2462 { 2463 struct sockaddr_in *sin_p; 2464 struct sockaddr_in6 *sin6_p; 2465 2466 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 2467 M_WAITOK); 2468 sin_p = (struct sockaddr_in *)*nam; 2469 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2470 FREE(*nam, M_SONAME); 2471 *nam = (struct sockaddr *)sin6_p; 2472 } 2473