1 /* $FreeBSD: src/sys/netinet6/in6.c,v 1.7.2.9 2002/04/28 05:40:26 suz Exp $ */ 2 /* $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1991, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)in.c 8.2 (Berkeley) 11/15/93 66 */ 67 68 #include "opt_inet.h" 69 #include "opt_inet6.h" 70 71 #include <sys/param.h> 72 #include <sys/errno.h> 73 #include <sys/malloc.h> 74 #include <sys/socket.h> 75 #include <sys/socketvar.h> 76 #include <sys/sockio.h> 77 #include <sys/systm.h> 78 #include <sys/proc.h> 79 #include <sys/priv.h> 80 #include <sys/time.h> 81 #include <sys/kernel.h> 82 #include <sys/syslog.h> 83 84 #include <sys/thread2.h> 85 #include <sys/msgport2.h> 86 87 #include <net/if.h> 88 #include <net/if_types.h> 89 #include <net/route.h> 90 #include <net/if_dl.h> 91 92 #include <netinet/in.h> 93 #include <netinet/in_var.h> 94 #include <netinet/if_ether.h> 95 #include <netinet/in_systm.h> 96 #include <netinet/ip.h> 97 #include <netinet/in_pcb.h> 98 99 #include <netinet/ip6.h> 100 #include <netinet6/ip6_var.h> 101 #include <netinet6/nd6.h> 102 #include <netinet6/mld6_var.h> 103 #include <netinet6/ip6_mroute.h> 104 #include <netinet6/in6_ifattach.h> 105 #include <netinet6/scope6_var.h> 106 #include <netinet6/in6_pcb.h> 107 #include <netinet6/in6_var.h> 108 109 #include <net/net_osdep.h> 110 111 /* 112 * Definitions of some costant IP6 addresses. 113 */ 114 const struct in6_addr kin6addr_any = IN6ADDR_ANY_INIT; 115 const struct in6_addr kin6addr_loopback = IN6ADDR_LOOPBACK_INIT; 116 const struct in6_addr kin6addr_nodelocal_allnodes = 117 IN6ADDR_NODELOCAL_ALLNODES_INIT; 118 const struct in6_addr kin6addr_linklocal_allnodes = 119 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 120 const struct in6_addr kin6addr_linklocal_allrouters = 121 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 122 123 const struct in6_addr in6mask0 = IN6MASK0; 124 const struct in6_addr in6mask32 = IN6MASK32; 125 const struct in6_addr in6mask64 = IN6MASK64; 126 const struct in6_addr in6mask96 = IN6MASK96; 127 const struct in6_addr in6mask128 = IN6MASK128; 128 129 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6, 130 0, 0, IN6ADDR_ANY_INIT, 0}; 131 132 static int in6_lifaddr_ioctl (struct socket *, u_long, caddr_t, 133 struct ifnet *, struct thread *); 134 static int in6_ifinit (struct ifnet *, struct in6_ifaddr *, 135 struct sockaddr_in6 *, int); 136 static void in6_unlink_ifa (struct in6_ifaddr *, struct ifnet *); 137 static void in6_ifloop_request_callback(int, int, struct rt_addrinfo *, struct rtentry *, void *); 138 139 struct in6_multihead in6_multihead; /* XXX BSS initialization */ 140 141 int (*faithprefix_p)(struct in6_addr *); 142 143 /* 144 * Subroutine for in6_ifaddloop() and in6_ifremloop(). 145 * This routine does actual work. 146 */ 147 static void 148 in6_ifloop_request(int cmd, struct ifaddr *ifa) 149 { 150 struct sockaddr_in6 all1_sa; 151 struct rt_addrinfo rtinfo; 152 int error; 153 154 bzero(&all1_sa, sizeof(all1_sa)); 155 all1_sa.sin6_family = AF_INET6; 156 all1_sa.sin6_len = sizeof(struct sockaddr_in6); 157 all1_sa.sin6_addr = in6mask128; 158 159 /* 160 * We specify the address itself as the gateway, and set the 161 * RTF_LLINFO flag, so that the corresponding host route would have 162 * the flag, and thus applications that assume traditional behavior 163 * would be happy. Note that we assume the caller of the function 164 * (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest, 165 * which changes the outgoing interface to the loopback interface. 166 */ 167 bzero(&rtinfo, sizeof(struct rt_addrinfo)); 168 rtinfo.rti_info[RTAX_DST] = ifa->ifa_addr; 169 rtinfo.rti_info[RTAX_GATEWAY] = ifa->ifa_addr; 170 rtinfo.rti_info[RTAX_NETMASK] = (struct sockaddr *)&all1_sa; 171 rtinfo.rti_flags = RTF_UP|RTF_HOST|RTF_LLINFO; 172 173 error = rtrequest1_global(cmd, &rtinfo, 174 in6_ifloop_request_callback, ifa); 175 if (error != 0) { 176 log(LOG_ERR, "in6_ifloop_request: " 177 "%s operation failed for %s (errno=%d)\n", 178 cmd == RTM_ADD ? "ADD" : "DELETE", 179 ip6_sprintf(&((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr), 180 error); 181 } 182 } 183 184 static void 185 in6_ifloop_request_callback(int cmd, int error, struct rt_addrinfo *rtinfo, 186 struct rtentry *rt, void *arg) 187 { 188 struct ifaddr *ifa = arg; 189 190 if (error) 191 goto done; 192 193 /* 194 * Make sure rt_ifa be equal to IFA, the second argument of the 195 * function. 196 * We need this because when we refer to rt_ifa->ia6_flags in 197 * ip6_input, we assume that the rt_ifa points to the address instead 198 * of the loopback address. 199 */ 200 if (cmd == RTM_ADD && rt && ifa != rt->rt_ifa) { 201 ++rt->rt_refcnt; 202 IFAFREE(rt->rt_ifa); 203 IFAREF(ifa); 204 rt->rt_ifa = ifa; 205 --rt->rt_refcnt; 206 } 207 208 /* 209 * Report the addition/removal of the address to the routing socket. 210 * XXX: since we called rtinit for a p2p interface with a destination, 211 * we end up reporting twice in such a case. Should we rather 212 * omit the second report? 213 */ 214 if (rt) { 215 if (mycpuid == 0) 216 rt_newaddrmsg(cmd, ifa, error, rt); 217 if (cmd == RTM_DELETE) { 218 if (rt->rt_refcnt == 0) { 219 ++rt->rt_refcnt; 220 rtfree(rt); 221 } 222 } 223 } 224 done: 225 /* no way to return any new error */ 226 ; 227 } 228 229 /* 230 * Add ownaddr as loopback rtentry. We previously add the route only if 231 * necessary (ex. on a p2p link). However, since we now manage addresses 232 * separately from prefixes, we should always add the route. We can't 233 * rely on the cloning mechanism from the corresponding interface route 234 * any more. 235 */ 236 void 237 in6_ifaddloop(struct ifaddr *ifa) 238 { 239 struct rtentry *rt; 240 241 /* If there is no loopback entry, allocate one. */ 242 rt = rtpurelookup(ifa->ifa_addr); 243 if (rt == NULL || !(rt->rt_flags & RTF_HOST) || 244 !(rt->rt_ifp->if_flags & IFF_LOOPBACK)) 245 in6_ifloop_request(RTM_ADD, ifa); 246 if (rt != NULL) 247 rt->rt_refcnt--; 248 } 249 250 /* 251 * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(), 252 * if it exists. 253 */ 254 void 255 in6_ifremloop(struct ifaddr *ifa) 256 { 257 struct in6_ifaddr *ia; 258 struct rtentry *rt; 259 int ia_count = 0; 260 261 /* 262 * Some of BSD variants do not remove cloned routes 263 * from an interface direct route, when removing the direct route 264 * (see comments in net/net_osdep.h). Even for variants that do remove 265 * cloned routes, they could fail to remove the cloned routes when 266 * we handle multple addresses that share a common prefix. 267 * So, we should remove the route corresponding to the deleted address 268 * regardless of the result of in6_is_ifloop_auto(). 269 */ 270 271 /* 272 * Delete the entry only if exact one ifa exists. More than one ifa 273 * can exist if we assign a same single address to multiple 274 * (probably p2p) interfaces. 275 * XXX: we should avoid such a configuration in IPv6... 276 */ 277 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 278 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) { 279 ia_count++; 280 if (ia_count > 1) 281 break; 282 } 283 } 284 285 if (ia_count == 1) { 286 /* 287 * Before deleting, check if a corresponding loopbacked host 288 * route surely exists. With this check, we can avoid to 289 * delete an interface direct route whose destination is same 290 * as the address being removed. This can happen when remofing 291 * a subnet-router anycast address on an interface attahced 292 * to a shared medium. 293 */ 294 rt = rtpurelookup(ifa->ifa_addr); 295 if (rt != NULL && (rt->rt_flags & RTF_HOST) && 296 (rt->rt_ifp->if_flags & IFF_LOOPBACK)) { 297 rt->rt_refcnt--; 298 in6_ifloop_request(RTM_DELETE, ifa); 299 } 300 } 301 } 302 303 int 304 in6_ifindex2scopeid(int idx) 305 { 306 struct ifnet *ifp; 307 struct sockaddr_in6 *sin6; 308 struct ifaddr_container *ifac; 309 310 if (idx < 0 || if_index < idx) 311 return -1; 312 ifp = ifindex2ifnet[idx]; 313 314 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) 315 { 316 struct ifaddr *ifa = ifac->ifa; 317 318 if (ifa->ifa_addr->sa_family != AF_INET6) 319 continue; 320 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 321 if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) 322 return sin6->sin6_scope_id & 0xffff; 323 } 324 325 return -1; 326 } 327 328 int 329 in6_mask2len(struct in6_addr *mask, u_char *lim0) 330 { 331 int x = 0, y; 332 u_char *lim = lim0, *p; 333 334 if (lim0 == NULL || 335 lim0 - (u_char *)mask > sizeof(*mask)) /* ignore the scope_id part */ 336 lim = (u_char *)mask + sizeof(*mask); 337 for (p = (u_char *)mask; p < lim; x++, p++) { 338 if (*p != 0xff) 339 break; 340 } 341 y = 0; 342 if (p < lim) { 343 for (y = 0; y < 8; y++) { 344 if ((*p & (0x80 >> y)) == 0) 345 break; 346 } 347 } 348 349 /* 350 * when the limit pointer is given, do a stricter check on the 351 * remaining bits. 352 */ 353 if (p < lim) { 354 if (y != 0 && (*p & (0x00ff >> y)) != 0) 355 return (-1); 356 for (p = p + 1; p < lim; p++) 357 if (*p != 0) 358 return (-1); 359 } 360 361 return x * 8 + y; 362 } 363 364 void 365 in6_len2mask(struct in6_addr *mask, int len) 366 { 367 int i; 368 369 bzero(mask, sizeof(*mask)); 370 for (i = 0; i < len / 8; i++) 371 mask->s6_addr8[i] = 0xff; 372 if (len % 8) 373 mask->s6_addr8[i] = (0xff00 >> (len % 8)) & 0xff; 374 } 375 376 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 377 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 378 379 void 380 in6_control_dispatch(netmsg_t msg) 381 { 382 int error; 383 384 error = in6_control(msg->control.base.nm_so, 385 msg->control.nm_cmd, 386 msg->control.nm_data, 387 msg->control.nm_ifp, 388 msg->control.nm_td); 389 lwkt_replymsg(&msg->control.base.lmsg, error); 390 } 391 392 int 393 in6_control(struct socket *so, u_long cmd, caddr_t data, 394 struct ifnet *ifp, struct thread *td) 395 { 396 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 397 struct in6_ifaddr *ia = NULL; 398 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 399 int privileged; 400 int error; 401 402 privileged = 0; 403 if (priv_check(td, PRIV_ROOT) == 0) 404 privileged++; 405 406 switch (cmd) { 407 case SIOCGETSGCNT_IN6: 408 case SIOCGETMIFCNT_IN6: 409 return (mrt6_ioctl(cmd, data)); 410 } 411 412 switch(cmd) { 413 case SIOCAADDRCTL_POLICY: 414 case SIOCDADDRCTL_POLICY: 415 if (!privileged) 416 return (EPERM); 417 return (in6_src_ioctl(cmd, data)); 418 } 419 420 if (ifp == NULL) 421 return (EOPNOTSUPP); 422 423 switch (cmd) { 424 case SIOCSNDFLUSH_IN6: 425 case SIOCSPFXFLUSH_IN6: 426 case SIOCSRTRFLUSH_IN6: 427 case SIOCSDEFIFACE_IN6: 428 case SIOCSIFINFO_FLAGS: 429 if (!privileged) 430 return (EPERM); 431 /* fall through */ 432 case OSIOCGIFINFO_IN6: 433 case SIOCGIFINFO_IN6: 434 case SIOCGDRLST_IN6: 435 case SIOCGPRLST_IN6: 436 case SIOCGNBRINFO_IN6: 437 case SIOCGDEFIFACE_IN6: 438 return (nd6_ioctl(cmd, data, ifp)); 439 } 440 441 switch (cmd) { 442 case SIOCSIFPREFIX_IN6: 443 case SIOCDIFPREFIX_IN6: 444 case SIOCAIFPREFIX_IN6: 445 case SIOCCIFPREFIX_IN6: 446 case SIOCSGIFPREFIX_IN6: 447 case SIOCGIFPREFIX_IN6: 448 log(LOG_NOTICE, 449 "prefix ioctls are now invalidated. " 450 "please use ifconfig.\n"); 451 return (EOPNOTSUPP); 452 } 453 454 switch (cmd) { 455 case SIOCSSCOPE6: 456 if (!privileged) 457 return (EPERM); 458 return (scope6_set(ifp, 459 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 460 break; 461 case SIOCGSCOPE6: 462 return (scope6_get(ifp, 463 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 464 break; 465 case SIOCGSCOPE6DEF: 466 return (scope6_get_default((struct scope6_id *) 467 ifr->ifr_ifru.ifru_scope_id)); 468 break; 469 } 470 471 switch (cmd) { 472 case SIOCALIFADDR: 473 case SIOCDLIFADDR: 474 if (!privileged) 475 return (EPERM); 476 /* fall through */ 477 case SIOCGLIFADDR: 478 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 479 } 480 481 /* 482 * Find address for this interface, if it exists. 483 */ 484 if (ifra->ifra_addr.sin6_family == AF_INET6) { /* XXX */ 485 struct sockaddr_in6 *sa6 = 486 (struct sockaddr_in6 *)&ifra->ifra_addr; 487 488 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) { 489 if (sa6->sin6_addr.s6_addr16[1] == 0) { 490 /* link ID is not embedded by the user */ 491 sa6->sin6_addr.s6_addr16[1] = 492 htons(ifp->if_index); 493 } else if (sa6->sin6_addr.s6_addr16[1] != 494 htons(ifp->if_index)) { 495 return (EINVAL); /* link ID contradicts */ 496 } 497 if (sa6->sin6_scope_id) { 498 if (sa6->sin6_scope_id != 499 (u_int32_t)ifp->if_index) 500 return (EINVAL); 501 sa6->sin6_scope_id = 0; /* XXX: good way? */ 502 } 503 } 504 ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr); 505 } 506 507 switch (cmd) { 508 case SIOCSIFADDR_IN6: 509 case SIOCSIFDSTADDR_IN6: 510 case SIOCSIFNETMASK_IN6: 511 /* 512 * Since IPv6 allows a node to assign multiple addresses 513 * on a single interface, SIOCSIFxxx ioctls are not suitable 514 * and should be unused. 515 */ 516 /* we decided to obsolete this command (20000704) */ 517 return (EINVAL); 518 519 case SIOCDIFADDR_IN6: 520 /* 521 * for IPv4, we look for existing in_ifaddr here to allow 522 * "ifconfig if0 delete" to remove first IPv4 address on the 523 * interface. For IPv6, as the spec allow multiple interface 524 * address from the day one, we consider "remove the first one" 525 * semantics to be not preferable. 526 */ 527 if (ia == NULL) 528 return (EADDRNOTAVAIL); 529 /* FALLTHROUGH */ 530 case SIOCAIFADDR_IN6: 531 /* 532 * We always require users to specify a valid IPv6 address for 533 * the corresponding operation. 534 */ 535 if (ifra->ifra_addr.sin6_family != AF_INET6 || 536 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) 537 return (EAFNOSUPPORT); 538 if (!privileged) 539 return (EPERM); 540 541 break; 542 543 case SIOCGIFADDR_IN6: 544 /* This interface is basically deprecated. use SIOCGIFCONF. */ 545 /* fall through */ 546 case SIOCGIFAFLAG_IN6: 547 case SIOCGIFNETMASK_IN6: 548 case SIOCGIFDSTADDR_IN6: 549 case SIOCGIFALIFETIME_IN6: 550 /* must think again about its semantics */ 551 if (ia == NULL) 552 return (EADDRNOTAVAIL); 553 break; 554 case SIOCSIFALIFETIME_IN6: 555 { 556 struct in6_addrlifetime *lt; 557 558 if (!privileged) 559 return (EPERM); 560 if (ia == NULL) 561 return (EADDRNOTAVAIL); 562 /* sanity for overflow - beware unsigned */ 563 lt = &ifr->ifr_ifru.ifru_lifetime; 564 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME 565 && lt->ia6t_vltime + time_second < time_second) { 566 return EINVAL; 567 } 568 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME 569 && lt->ia6t_pltime + time_second < time_second) { 570 return EINVAL; 571 } 572 break; 573 } 574 } 575 576 switch (cmd) { 577 578 case SIOCGIFADDR_IN6: 579 ifr->ifr_addr = ia->ia_addr; 580 break; 581 582 case SIOCGIFDSTADDR_IN6: 583 if (!(ifp->if_flags & IFF_POINTOPOINT)) 584 return (EINVAL); 585 /* 586 * XXX: should we check if ifa_dstaddr is NULL and return 587 * an error? 588 */ 589 ifr->ifr_dstaddr = ia->ia_dstaddr; 590 break; 591 592 case SIOCGIFNETMASK_IN6: 593 ifr->ifr_addr = ia->ia_prefixmask; 594 break; 595 596 case SIOCGIFAFLAG_IN6: 597 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 598 break; 599 600 case SIOCGIFSTAT_IN6: 601 if (ifp == NULL) 602 return EINVAL; 603 bzero(&ifr->ifr_ifru.ifru_stat, 604 sizeof(ifr->ifr_ifru.ifru_stat)); 605 ifr->ifr_ifru.ifru_stat = 606 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat; 607 break; 608 609 case SIOCGIFSTAT_ICMP6: 610 bzero(&ifr->ifr_ifru.ifru_stat, 611 sizeof(ifr->ifr_ifru.ifru_icmp6stat)); 612 ifr->ifr_ifru.ifru_icmp6stat = 613 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat; 614 break; 615 616 case SIOCGIFALIFETIME_IN6: 617 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 618 break; 619 620 case SIOCSIFALIFETIME_IN6: 621 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; 622 /* for sanity */ 623 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 624 ia->ia6_lifetime.ia6t_expire = 625 time_second + ia->ia6_lifetime.ia6t_vltime; 626 } else 627 ia->ia6_lifetime.ia6t_expire = 0; 628 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 629 ia->ia6_lifetime.ia6t_preferred = 630 time_second + ia->ia6_lifetime.ia6t_pltime; 631 } else 632 ia->ia6_lifetime.ia6t_preferred = 0; 633 break; 634 635 case SIOCAIFADDR_IN6: 636 { 637 int i, error = 0, iaIsNew; 638 struct nd_prefix pr0, *pr; 639 640 if (ia != NULL) 641 iaIsNew = 0; 642 else 643 iaIsNew = 1; 644 645 /* 646 * first, make or update the interface address structure, 647 * and link it to the list. 648 */ 649 if ((error = in6_update_ifa(ifp, ifra, ia)) != 0) 650 return (error); 651 652 /* 653 * then, make the prefix on-link on the interface. 654 * XXX: we'd rather create the prefix before the address, but 655 * we need at least one address to install the corresponding 656 * interface route, so we configure the address first. 657 */ 658 659 /* 660 * convert mask to prefix length (prefixmask has already 661 * been validated in in6_update_ifa(). 662 */ 663 bzero(&pr0, sizeof(pr0)); 664 pr0.ndpr_ifp = ifp; 665 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 666 NULL); 667 if (pr0.ndpr_plen == 128) 668 break; /* we don't need to install a host route. */ 669 pr0.ndpr_prefix = ifra->ifra_addr; 670 pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr; 671 /* apply the mask for safety. */ 672 for (i = 0; i < 4; i++) { 673 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 674 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i]; 675 } 676 /* 677 * XXX: since we don't have an API to set prefix (not address) 678 * lifetimes, we just use the same lifetimes as addresses. 679 * The (temporarily) installed lifetimes can be overridden by 680 * later advertised RAs (when accept_rtadv is non 0), which is 681 * an intended behavior. 682 */ 683 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 684 pr0.ndpr_raf_auto = 685 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 686 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 687 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 688 689 /* add the prefix if there's one. */ 690 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 691 /* 692 * nd6_prelist_add will install the corresponding 693 * interface route. 694 */ 695 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) 696 return (error); 697 if (pr == NULL) { 698 log(LOG_ERR, "nd6_prelist_add succeeded but " 699 "no prefix\n"); 700 return (EINVAL); /* XXX panic here? */ 701 } 702 } 703 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 704 == NULL) { 705 /* XXX: this should not happen! */ 706 log(LOG_ERR, "in6_control: addition succeeded, but" 707 " no ifaddr\n"); 708 } else { 709 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 710 ia->ia6_ndpr == NULL) { /* new autoconfed addr */ 711 ia->ia6_ndpr = pr; 712 pr->ndpr_refcnt++; 713 714 /* 715 * If this is the first autoconf address from 716 * the prefix, create a temporary address 717 * as well (when specified). 718 */ 719 if (ip6_use_tempaddr && 720 pr->ndpr_refcnt == 1) { 721 int e; 722 if ((e = in6_tmpifadd(ia, 1)) != 0) { 723 log(LOG_NOTICE, "in6_control: " 724 "failed to create a " 725 "temporary address, " 726 "errno=%d\n", 727 e); 728 } 729 } 730 } 731 732 /* 733 * this might affect the status of autoconfigured 734 * addresses, that is, this address might make 735 * other addresses detached. 736 */ 737 pfxlist_onlink_check(); 738 } 739 if (error == 0 && ia) { 740 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 741 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 742 &ia->ia_ifa); 743 } 744 break; 745 } 746 747 case SIOCDIFADDR_IN6: 748 { 749 int i = 0; 750 struct nd_prefix pr0, *pr; 751 752 /* 753 * If the address being deleted is the only one that owns 754 * the corresponding prefix, expire the prefix as well. 755 * XXX: theoretically, we don't have to warry about such 756 * relationship, since we separate the address management 757 * and the prefix management. We do this, however, to provide 758 * as much backward compatibility as possible in terms of 759 * the ioctl operation. 760 */ 761 bzero(&pr0, sizeof(pr0)); 762 pr0.ndpr_ifp = ifp; 763 pr0.ndpr_plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, 764 NULL); 765 if (pr0.ndpr_plen == 128) 766 goto purgeaddr; 767 pr0.ndpr_prefix = ia->ia_addr; 768 pr0.ndpr_mask = ia->ia_prefixmask.sin6_addr; 769 for (i = 0; i < 4; i++) { 770 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 771 ia->ia_prefixmask.sin6_addr.s6_addr32[i]; 772 } 773 /* 774 * The logic of the following condition is a bit complicated. 775 * We expire the prefix when 776 * 1. the address obeys autoconfiguration and it is the 777 * only owner of the associated prefix, or 778 * 2. the address does not obey autoconf and there is no 779 * other owner of the prefix. 780 */ 781 if ((pr = nd6_prefix_lookup(&pr0)) != NULL && 782 (((ia->ia6_flags & IN6_IFF_AUTOCONF) && 783 pr->ndpr_refcnt == 1) || 784 (!(ia->ia6_flags & IN6_IFF_AUTOCONF) && 785 pr->ndpr_refcnt == 0))) { 786 pr->ndpr_expire = 1; /* XXX: just for expiration */ 787 } 788 789 purgeaddr: 790 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE, 791 &ia->ia_ifa); 792 in6_purgeaddr(&ia->ia_ifa); 793 break; 794 } 795 796 default: 797 if (ifp == NULL || ifp->if_ioctl == NULL) 798 return (EOPNOTSUPP); 799 ifnet_serialize_all(ifp); 800 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred); 801 ifnet_deserialize_all(ifp); 802 return (error); 803 } 804 805 return (0); 806 } 807 808 /* 809 * Update parameters of an IPv6 interface address. 810 * If necessary, a new entry is created and linked into address chains. 811 * This function is separated from in6_control(). 812 * XXX: should this be performed under splnet()? 813 */ 814 int 815 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 816 struct in6_ifaddr *ia) 817 { 818 int error = 0, hostIsNew = 0, plen = -1; 819 struct in6_ifaddr *oia; 820 struct sockaddr_in6 dst6; 821 struct in6_addrlifetime *lt; 822 823 /* Validate parameters */ 824 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 825 return (EINVAL); 826 827 /* 828 * The destination address for a p2p link must have a family 829 * of AF_UNSPEC or AF_INET6. 830 */ 831 if ((ifp->if_flags & IFF_POINTOPOINT) && 832 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 833 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 834 return (EAFNOSUPPORT); 835 /* 836 * validate ifra_prefixmask. don't check sin6_family, netmask 837 * does not carry fields other than sin6_len. 838 */ 839 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 840 return (EINVAL); 841 /* 842 * Because the IPv6 address architecture is classless, we require 843 * users to specify a (non 0) prefix length (mask) for a new address. 844 * We also require the prefix (when specified) mask is valid, and thus 845 * reject a non-consecutive mask. 846 */ 847 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 848 return (EINVAL); 849 if (ifra->ifra_prefixmask.sin6_len != 0) { 850 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 851 (u_char *)&ifra->ifra_prefixmask + 852 ifra->ifra_prefixmask.sin6_len); 853 if (plen <= 0) 854 return (EINVAL); 855 } 856 else { 857 /* 858 * In this case, ia must not be NULL. We just use its prefix 859 * length. 860 */ 861 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 862 } 863 /* 864 * If the destination address on a p2p interface is specified, 865 * and the address is a scoped one, validate/set the scope 866 * zone identifier. 867 */ 868 dst6 = ifra->ifra_dstaddr; 869 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) && 870 (dst6.sin6_family == AF_INET6)) { 871 int scopeid; 872 873 if ((error = in6_recoverscope(&dst6, 874 &ifra->ifra_dstaddr.sin6_addr, 875 ifp)) != 0) 876 return (error); 877 scopeid = in6_addr2scopeid(ifp, &dst6.sin6_addr); 878 if (dst6.sin6_scope_id == 0) /* user omit to specify the ID. */ 879 dst6.sin6_scope_id = scopeid; 880 else if (dst6.sin6_scope_id != scopeid) 881 return (EINVAL); /* scope ID mismatch. */ 882 if ((error = in6_embedscope(&dst6.sin6_addr, &dst6, NULL, NULL)) 883 != 0) 884 return (error); 885 dst6.sin6_scope_id = 0; /* XXX */ 886 } 887 /* 888 * The destination address can be specified only for a p2p or a 889 * loopback interface. If specified, the corresponding prefix length 890 * must be 128. 891 */ 892 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 893 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0) { 894 /* XXX: noisy message */ 895 log(LOG_INFO, "in6_update_ifa: a destination can be " 896 "specified for a p2p or a loopback IF only\n"); 897 return (EINVAL); 898 } 899 if (plen != 128) { 900 /* 901 * The following message seems noisy, but we dare to 902 * add it for diagnosis. 903 */ 904 log(LOG_INFO, "in6_update_ifa: prefixlen must be 128 " 905 "when dstaddr is specified\n"); 906 return (EINVAL); 907 } 908 } 909 /* lifetime consistency check */ 910 lt = &ifra->ifra_lifetime; 911 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME 912 && lt->ia6t_vltime + time_second < time_second) { 913 return EINVAL; 914 } 915 if (lt->ia6t_vltime == 0) { 916 /* 917 * the following log might be noisy, but this is a typical 918 * configuration mistake or a tool's bug. 919 */ 920 log(LOG_INFO, 921 "in6_update_ifa: valid lifetime is 0 for %s\n", 922 ip6_sprintf(&ifra->ifra_addr.sin6_addr)); 923 } 924 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME 925 && lt->ia6t_pltime + time_second < time_second) { 926 return EINVAL; 927 } 928 929 /* 930 * If this is a new address, allocate a new ifaddr and link it 931 * into chains. 932 */ 933 if (ia == NULL) { 934 hostIsNew = 1; 935 /* 936 * When in6_update_ifa() is called in a process of a received 937 * RA, it is called under splnet(). So, we should call malloc 938 * with M_NOWAIT. 939 */ 940 ia = ifa_create(sizeof(*ia), M_NOWAIT); 941 if (ia == NULL) 942 return (ENOBUFS); 943 /* Initialize the address and masks */ 944 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 945 ia->ia_addr.sin6_family = AF_INET6; 946 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 947 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 948 /* 949 * XXX: some functions expect that ifa_dstaddr is not 950 * NULL for p2p interfaces. 951 */ 952 ia->ia_ifa.ifa_dstaddr 953 = (struct sockaddr *)&ia->ia_dstaddr; 954 } else { 955 ia->ia_ifa.ifa_dstaddr = NULL; 956 } 957 ia->ia_ifa.ifa_netmask 958 = (struct sockaddr *)&ia->ia_prefixmask; 959 960 ia->ia_ifp = ifp; 961 if ((oia = in6_ifaddr) != NULL) { 962 for ( ; oia->ia_next; oia = oia->ia_next) 963 continue; 964 oia->ia_next = ia; 965 } else 966 in6_ifaddr = ia; 967 968 ifa_iflink(&ia->ia_ifa, ifp, 1); 969 } 970 971 /* set prefix mask */ 972 if (ifra->ifra_prefixmask.sin6_len) { 973 /* 974 * We prohibit changing the prefix length of an existing 975 * address, because 976 * + such an operation should be rare in IPv6, and 977 * + the operation would confuse prefix management. 978 */ 979 if (ia->ia_prefixmask.sin6_len && 980 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 981 log(LOG_INFO, "in6_update_ifa: the prefix length of an" 982 " existing (%s) address should not be changed\n", 983 ip6_sprintf(&ia->ia_addr.sin6_addr)); 984 error = EINVAL; 985 goto unlink; 986 } 987 ia->ia_prefixmask = ifra->ifra_prefixmask; 988 } 989 990 /* 991 * If a new destination address is specified, scrub the old one and 992 * install the new destination. Note that the interface must be 993 * p2p or loopback (see the check above.) 994 */ 995 if (dst6.sin6_family == AF_INET6 && 996 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, 997 &ia->ia_dstaddr.sin6_addr)) { 998 int e; 999 1000 if ((ia->ia_flags & IFA_ROUTE) && 1001 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 1002 != 0) { 1003 log(LOG_ERR, "in6_update_ifa: failed to remove " 1004 "a route to the old destination: %s\n", 1005 ip6_sprintf(&ia->ia_addr.sin6_addr)); 1006 /* proceed anyway... */ 1007 } 1008 else 1009 ia->ia_flags &= ~IFA_ROUTE; 1010 ia->ia_dstaddr = dst6; 1011 } 1012 1013 /* reset the interface and routing table appropriately. */ 1014 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 1015 goto unlink; 1016 1017 /* 1018 * Beyond this point, we should call in6_purgeaddr upon an error, 1019 * not just go to unlink. 1020 */ 1021 1022 #if 0 /* disable this mechanism for now */ 1023 /* update prefix list */ 1024 if (hostIsNew && 1025 (ifra->ifra_flags & IN6_IFF_NOPFX) == 0) { /* XXX */ 1026 int iilen; 1027 1028 iilen = (sizeof(ia->ia_prefixmask.sin6_addr) << 3) - plen; 1029 if ((error = in6_prefix_add_ifid(iilen, ia)) != 0) { 1030 in6_purgeaddr((struct ifaddr *)ia); 1031 return (error); 1032 } 1033 } 1034 #endif 1035 1036 if (ifp->if_flags & IFF_MULTICAST) { 1037 struct sockaddr_in6 mltaddr, mltmask; 1038 struct in6_multi *in6m; 1039 1040 if (hostIsNew) { 1041 /* 1042 * join solicited multicast addr for new host id 1043 */ 1044 struct in6_addr llsol; 1045 bzero(&llsol, sizeof(struct in6_addr)); 1046 llsol.s6_addr16[0] = htons(0xff02); 1047 llsol.s6_addr16[1] = htons(ifp->if_index); 1048 llsol.s6_addr32[1] = 0; 1049 llsol.s6_addr32[2] = htonl(1); 1050 llsol.s6_addr32[3] = 1051 ifra->ifra_addr.sin6_addr.s6_addr32[3]; 1052 llsol.s6_addr8[12] = 0xff; 1053 in6_addmulti(&llsol, ifp, &error); 1054 if (error != 0) { 1055 log(LOG_WARNING, 1056 "in6_update_ifa: addmulti failed for " 1057 "%s on %s (errno=%d)\n", 1058 ip6_sprintf(&llsol), if_name(ifp), 1059 error); 1060 in6_purgeaddr((struct ifaddr *)ia); 1061 return (error); 1062 } 1063 } 1064 1065 bzero(&mltmask, sizeof(mltmask)); 1066 mltmask.sin6_len = sizeof(struct sockaddr_in6); 1067 mltmask.sin6_family = AF_INET6; 1068 mltmask.sin6_addr = in6mask32; 1069 1070 /* 1071 * join link-local all-nodes address 1072 */ 1073 bzero(&mltaddr, sizeof(mltaddr)); 1074 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 1075 mltaddr.sin6_family = AF_INET6; 1076 mltaddr.sin6_addr = kin6addr_linklocal_allnodes; 1077 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1078 1079 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1080 if (in6m == NULL) { 1081 rtrequest_global(RTM_ADD, 1082 (struct sockaddr *)&mltaddr, 1083 (struct sockaddr *)&ia->ia_addr, 1084 (struct sockaddr *)&mltmask, 1085 RTF_UP|RTF_CLONING); /* xxx */ 1086 in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 1087 if (error != 0) { 1088 log(LOG_WARNING, 1089 "in6_update_ifa: addmulti failed for " 1090 "%s on %s (errno=%d)\n", 1091 ip6_sprintf(&mltaddr.sin6_addr), 1092 if_name(ifp), error); 1093 } 1094 } 1095 1096 /* 1097 * join node information group address 1098 */ 1099 #define hostnamelen strlen(hostname) 1100 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr.sin6_addr) 1101 == 0) { 1102 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1103 if (in6m == NULL && ia != NULL) { 1104 in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 1105 if (error != 0) { 1106 log(LOG_WARNING, "in6_update_ifa: " 1107 "addmulti failed for " 1108 "%s on %s (errno=%d)\n", 1109 ip6_sprintf(&mltaddr.sin6_addr), 1110 if_name(ifp), error); 1111 } 1112 } 1113 } 1114 #undef hostnamelen 1115 1116 /* 1117 * join node-local all-nodes address, on loopback. 1118 * XXX: since "node-local" is obsoleted by interface-local, 1119 * we have to join the group on every interface with 1120 * some interface-boundary restriction. 1121 */ 1122 if (ifp->if_flags & IFF_LOOPBACK) { 1123 struct in6_ifaddr *ia_loop; 1124 1125 struct in6_addr loop6 = kin6addr_loopback; 1126 ia_loop = in6ifa_ifpwithaddr(ifp, &loop6); 1127 1128 mltaddr.sin6_addr = kin6addr_nodelocal_allnodes; 1129 1130 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1131 if (in6m == NULL && ia_loop != NULL) { 1132 rtrequest_global(RTM_ADD, 1133 (struct sockaddr *)&mltaddr, 1134 (struct sockaddr *)&ia_loop->ia_addr, 1135 (struct sockaddr *)&mltmask, 1136 RTF_UP); 1137 in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 1138 if (error != 0) { 1139 log(LOG_WARNING, "in6_update_ifa: " 1140 "addmulti failed for %s on %s " 1141 "(errno=%d)\n", 1142 ip6_sprintf(&mltaddr.sin6_addr), 1143 if_name(ifp), error); 1144 } 1145 } 1146 } 1147 } 1148 1149 ia->ia6_flags = ifra->ifra_flags; 1150 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /*safety*/ 1151 ia->ia6_flags &= ~IN6_IFF_NODAD; /* Mobile IPv6 */ 1152 1153 ia->ia6_lifetime = ifra->ifra_lifetime; 1154 /* for sanity */ 1155 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1156 ia->ia6_lifetime.ia6t_expire = 1157 time_second + ia->ia6_lifetime.ia6t_vltime; 1158 } else 1159 ia->ia6_lifetime.ia6t_expire = 0; 1160 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1161 ia->ia6_lifetime.ia6t_preferred = 1162 time_second + ia->ia6_lifetime.ia6t_pltime; 1163 } else 1164 ia->ia6_lifetime.ia6t_preferred = 0; 1165 1166 /* 1167 * Perform DAD, if needed. 1168 * XXX It may be of use, if we can administratively 1169 * disable DAD. 1170 */ 1171 if (in6if_do_dad(ifp) && !(ifra->ifra_flags & IN6_IFF_NODAD)) { 1172 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1173 nd6_dad_start((struct ifaddr *)ia, NULL); 1174 } 1175 1176 return (error); 1177 1178 unlink: 1179 /* 1180 * XXX: if a change of an existing address failed, keep the entry 1181 * anyway. 1182 */ 1183 if (hostIsNew) 1184 in6_unlink_ifa(ia, ifp); 1185 return (error); 1186 } 1187 1188 void 1189 in6_purgeaddr(struct ifaddr *ifa) 1190 { 1191 struct ifnet *ifp = ifa->ifa_ifp; 1192 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1193 1194 /* stop DAD processing */ 1195 nd6_dad_stop(ifa); 1196 1197 /* 1198 * delete route to the destination of the address being purged. 1199 * The interface must be p2p or loopback in this case. 1200 */ 1201 if ((ia->ia_flags & IFA_ROUTE) && ia->ia_dstaddr.sin6_len != 0) { 1202 int e; 1203 1204 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 1205 != 0) { 1206 log(LOG_ERR, "in6_purgeaddr: failed to remove " 1207 "a route to the p2p destination: %s on %s, " 1208 "errno=%d\n", 1209 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp), 1210 e); 1211 /* proceed anyway... */ 1212 } 1213 else 1214 ia->ia_flags &= ~IFA_ROUTE; 1215 } 1216 1217 /* Remove ownaddr's loopback rtentry, if it exists. */ 1218 in6_ifremloop(&(ia->ia_ifa)); 1219 1220 if (ifp->if_flags & IFF_MULTICAST) { 1221 /* 1222 * delete solicited multicast addr for deleting host id 1223 */ 1224 struct in6_multi *in6m; 1225 struct in6_addr llsol; 1226 bzero(&llsol, sizeof(struct in6_addr)); 1227 llsol.s6_addr16[0] = htons(0xff02); 1228 llsol.s6_addr16[1] = htons(ifp->if_index); 1229 llsol.s6_addr32[1] = 0; 1230 llsol.s6_addr32[2] = htonl(1); 1231 llsol.s6_addr32[3] = 1232 ia->ia_addr.sin6_addr.s6_addr32[3]; 1233 llsol.s6_addr8[12] = 0xff; 1234 1235 IN6_LOOKUP_MULTI(llsol, ifp, in6m); 1236 if (in6m) 1237 in6_delmulti(in6m); 1238 } 1239 1240 in6_unlink_ifa(ia, ifp); 1241 } 1242 1243 static void 1244 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1245 { 1246 int plen, iilen; 1247 struct in6_ifaddr *oia; 1248 1249 crit_enter(); 1250 1251 ifa_ifunlink(&ia->ia_ifa, ifp); 1252 1253 oia = ia; 1254 if (oia == (ia = in6_ifaddr)) 1255 in6_ifaddr = ia->ia_next; 1256 else { 1257 while (ia->ia_next && (ia->ia_next != oia)) 1258 ia = ia->ia_next; 1259 if (ia->ia_next) 1260 ia->ia_next = oia->ia_next; 1261 else { 1262 /* search failed */ 1263 kprintf("Couldn't unlink in6_ifaddr from in6_ifaddr\n"); 1264 } 1265 } 1266 1267 if (oia->ia6_ifpr) { /* check for safety */ 1268 plen = in6_mask2len(&oia->ia_prefixmask.sin6_addr, NULL); 1269 iilen = (sizeof(oia->ia_prefixmask.sin6_addr) << 3) - plen; 1270 in6_prefix_remove_ifid(iilen, oia); 1271 } 1272 1273 /* 1274 * When an autoconfigured address is being removed, release the 1275 * reference to the base prefix. Also, since the release might 1276 * affect the status of other (detached) addresses, call 1277 * pfxlist_onlink_check(). 1278 */ 1279 if (oia->ia6_flags & IN6_IFF_AUTOCONF) { 1280 if (oia->ia6_ndpr == NULL) { 1281 log(LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address " 1282 "%p has no prefix\n", oia); 1283 } else { 1284 oia->ia6_ndpr->ndpr_refcnt--; 1285 oia->ia6_flags &= ~IN6_IFF_AUTOCONF; 1286 oia->ia6_ndpr = NULL; 1287 } 1288 1289 pfxlist_onlink_check(); 1290 } 1291 1292 /* 1293 * release another refcnt for the link from in6_ifaddr. 1294 * Note that we should decrement the refcnt at least once for all *BSD. 1295 */ 1296 ifa_destroy(&oia->ia_ifa); 1297 1298 crit_exit(); 1299 } 1300 1301 void 1302 in6_purgeif(struct ifnet *ifp) 1303 { 1304 struct ifaddr_container *ifac, *next; 1305 1306 TAILQ_FOREACH_MUTABLE(ifac, &ifp->if_addrheads[mycpuid], 1307 ifa_link, next) { 1308 if (ifac->ifa->ifa_addr->sa_family != AF_INET6) 1309 continue; 1310 in6_purgeaddr(ifac->ifa); 1311 } 1312 1313 in6_ifdetach(ifp); 1314 } 1315 1316 /* 1317 * SIOC[GAD]LIFADDR. 1318 * SIOCGLIFADDR: get first address. (?) 1319 * SIOCGLIFADDR with IFLR_PREFIX: 1320 * get first address that matches the specified prefix. 1321 * SIOCALIFADDR: add the specified address. 1322 * SIOCALIFADDR with IFLR_PREFIX: 1323 * add the specified prefix, filling hostid part from 1324 * the first link-local address. prefixlen must be <= 64. 1325 * SIOCDLIFADDR: delete the specified address. 1326 * SIOCDLIFADDR with IFLR_PREFIX: 1327 * delete the first address that matches the specified prefix. 1328 * return values: 1329 * EINVAL on invalid parameters 1330 * EADDRNOTAVAIL on prefix match failed/specified address not found 1331 * other values may be returned from in6_ioctl() 1332 * 1333 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1334 * this is to accomodate address naming scheme other than RFC2374, 1335 * in the future. 1336 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1337 * address encoding scheme. (see figure on page 8) 1338 */ 1339 static int 1340 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 1341 struct ifnet *ifp, struct thread *td) 1342 { 1343 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1344 struct sockaddr *sa; 1345 1346 /* sanity checks */ 1347 if (!data || !ifp) { 1348 panic("invalid argument to in6_lifaddr_ioctl"); 1349 /*NOTRECHED*/ 1350 } 1351 1352 switch (cmd) { 1353 case SIOCGLIFADDR: 1354 /* address must be specified on GET with IFLR_PREFIX */ 1355 if (!(iflr->flags & IFLR_PREFIX)) 1356 break; 1357 /* FALLTHROUGH */ 1358 case SIOCALIFADDR: 1359 case SIOCDLIFADDR: 1360 /* address must be specified on ADD and DELETE */ 1361 sa = (struct sockaddr *)&iflr->addr; 1362 if (sa->sa_family != AF_INET6) 1363 return EINVAL; 1364 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1365 return EINVAL; 1366 /* XXX need improvement */ 1367 sa = (struct sockaddr *)&iflr->dstaddr; 1368 if (sa->sa_family && sa->sa_family != AF_INET6) 1369 return EINVAL; 1370 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1371 return EINVAL; 1372 break; 1373 default: /* shouldn't happen */ 1374 #if 0 1375 panic("invalid cmd to in6_lifaddr_ioctl"); 1376 /* NOTREACHED */ 1377 #else 1378 return EOPNOTSUPP; 1379 #endif 1380 } 1381 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) 1382 return EINVAL; 1383 1384 switch (cmd) { 1385 case SIOCALIFADDR: 1386 { 1387 struct in6_aliasreq ifra; 1388 struct in6_addr *hostid = NULL; 1389 int prefixlen; 1390 1391 if (iflr->flags & IFLR_PREFIX) { 1392 struct ifaddr *ifa; 1393 struct sockaddr_in6 *sin6; 1394 1395 /* 1396 * hostid is to fill in the hostid part of the 1397 * address. hostid points to the first link-local 1398 * address attached to the interface. 1399 */ 1400 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1401 if (!ifa) 1402 return EADDRNOTAVAIL; 1403 hostid = IFA_IN6(ifa); 1404 1405 /* prefixlen must be <= 64. */ 1406 if (64 < iflr->prefixlen) 1407 return EINVAL; 1408 prefixlen = iflr->prefixlen; 1409 1410 /* hostid part must be zero. */ 1411 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1412 if (sin6->sin6_addr.s6_addr32[2] != 0 1413 || sin6->sin6_addr.s6_addr32[3] != 0) { 1414 return EINVAL; 1415 } 1416 } else 1417 prefixlen = iflr->prefixlen; 1418 1419 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1420 bzero(&ifra, sizeof(ifra)); 1421 bcopy(iflr->iflr_name, ifra.ifra_name, 1422 sizeof(ifra.ifra_name)); 1423 1424 bcopy(&iflr->addr, &ifra.ifra_addr, 1425 ((struct sockaddr *)&iflr->addr)->sa_len); 1426 if (hostid) { 1427 /* fill in hostid part */ 1428 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1429 hostid->s6_addr32[2]; 1430 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1431 hostid->s6_addr32[3]; 1432 } 1433 1434 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/ 1435 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1436 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1437 if (hostid) { 1438 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1439 hostid->s6_addr32[2]; 1440 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1441 hostid->s6_addr32[3]; 1442 } 1443 } 1444 1445 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1446 in6_len2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1447 1448 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1449 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td); 1450 } 1451 case SIOCGLIFADDR: 1452 case SIOCDLIFADDR: 1453 { 1454 struct ifaddr_container *ifac; 1455 struct in6_ifaddr *ia; 1456 struct in6_addr mask, candidate, match; 1457 struct sockaddr_in6 *sin6; 1458 int cmp; 1459 1460 bzero(&mask, sizeof(mask)); 1461 if (iflr->flags & IFLR_PREFIX) { 1462 /* lookup a prefix rather than address. */ 1463 in6_len2mask(&mask, iflr->prefixlen); 1464 1465 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1466 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1467 match.s6_addr32[0] &= mask.s6_addr32[0]; 1468 match.s6_addr32[1] &= mask.s6_addr32[1]; 1469 match.s6_addr32[2] &= mask.s6_addr32[2]; 1470 match.s6_addr32[3] &= mask.s6_addr32[3]; 1471 1472 /* if you set extra bits, that's wrong */ 1473 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1474 return EINVAL; 1475 1476 cmp = 1; 1477 } else { 1478 if (cmd == SIOCGLIFADDR) { 1479 /* on getting an address, take the 1st match */ 1480 cmp = 0; /* XXX */ 1481 } else { 1482 /* on deleting an address, do exact match */ 1483 in6_len2mask(&mask, 128); 1484 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1485 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1486 1487 cmp = 1; 1488 } 1489 } 1490 1491 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1492 struct ifaddr *ifa = ifac->ifa; 1493 1494 if (ifa->ifa_addr->sa_family != AF_INET6) 1495 continue; 1496 if (!cmp) 1497 break; 1498 1499 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1500 /* 1501 * XXX: this is adhoc, but is necessary to allow 1502 * a user to specify fe80::/64 (not /10) for a 1503 * link-local address. 1504 */ 1505 if (IN6_IS_ADDR_LINKLOCAL(&candidate)) 1506 candidate.s6_addr16[1] = 0; 1507 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1508 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1509 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1510 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1511 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1512 break; 1513 } 1514 if (ifac == NULL) 1515 return EADDRNOTAVAIL; 1516 ia = ifa2ia6(ifac->ifa); 1517 1518 if (cmd == SIOCGLIFADDR) { 1519 struct sockaddr_in6 *s6; 1520 1521 /* fill in the if_laddrreq structure */ 1522 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1523 s6 = (struct sockaddr_in6 *)&iflr->addr; 1524 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) { 1525 s6->sin6_addr.s6_addr16[1] = 0; 1526 s6->sin6_scope_id = 1527 in6_addr2scopeid(ifp, &s6->sin6_addr); 1528 } 1529 if (ifp->if_flags & IFF_POINTOPOINT) { 1530 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1531 ia->ia_dstaddr.sin6_len); 1532 s6 = (struct sockaddr_in6 *)&iflr->dstaddr; 1533 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) { 1534 s6->sin6_addr.s6_addr16[1] = 0; 1535 s6->sin6_scope_id = 1536 in6_addr2scopeid(ifp, 1537 &s6->sin6_addr); 1538 } 1539 } else 1540 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1541 1542 iflr->prefixlen = 1543 in6_mask2len(&ia->ia_prefixmask.sin6_addr, 1544 NULL); 1545 1546 iflr->flags = ia->ia6_flags; /* XXX */ 1547 1548 return 0; 1549 } else { 1550 struct in6_aliasreq ifra; 1551 1552 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1553 bzero(&ifra, sizeof(ifra)); 1554 bcopy(iflr->iflr_name, ifra.ifra_name, 1555 sizeof(ifra.ifra_name)); 1556 1557 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1558 ia->ia_addr.sin6_len); 1559 if (ifp->if_flags & IFF_POINTOPOINT) 1560 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1561 ia->ia_dstaddr.sin6_len); 1562 else 1563 bzero(&ifra.ifra_dstaddr, 1564 sizeof(ifra.ifra_dstaddr)); 1565 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1566 ia->ia_prefixmask.sin6_len); 1567 1568 ifra.ifra_flags = ia->ia6_flags; 1569 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, 1570 ifp, td); 1571 } 1572 } 1573 } 1574 1575 return EOPNOTSUPP; /* just for safety */ 1576 } 1577 1578 /* 1579 * Initialize an interface's intetnet6 address 1580 * and routing table entry. 1581 */ 1582 static int 1583 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, struct sockaddr_in6 *sin6, 1584 int newhost) 1585 { 1586 int error = 0, plen, ifacount = 0; 1587 struct ifaddr_container *ifac; 1588 1589 /* 1590 * Give the interface a chance to initialize 1591 * if this is its first address, 1592 * and to validate the address if necessary. 1593 */ 1594 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1595 if (ifac->ifa->ifa_addr == NULL) 1596 continue; /* just for safety */ 1597 if (ifac->ifa->ifa_addr->sa_family != AF_INET6) 1598 continue; 1599 ifacount++; 1600 } 1601 1602 ifnet_serialize_all(ifp); 1603 1604 ia->ia_addr = *sin6; 1605 1606 if (ifacount <= 1 && ifp->if_ioctl && 1607 (error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL))) { 1608 ifnet_deserialize_all(ifp); 1609 return (error); 1610 } 1611 1612 ifnet_deserialize_all(ifp); 1613 1614 ia->ia_ifa.ifa_metric = ifp->if_metric; 1615 1616 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1617 1618 /* 1619 * Special case: 1620 * If the destination address is specified for a point-to-point 1621 * interface, install a route to the destination as an interface 1622 * direct route. 1623 */ 1624 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1625 if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) { 1626 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, 1627 RTF_UP | RTF_HOST)) != 0) 1628 return (error); 1629 ia->ia_flags |= IFA_ROUTE; 1630 } 1631 if (plen < 128) { 1632 /* 1633 * The RTF_CLONING flag is necessary for in6_is_ifloop_auto(). 1634 */ 1635 ia->ia_ifa.ifa_flags |= RTF_CLONING; 1636 } 1637 1638 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1639 if (newhost) { 1640 /* set the rtrequest function to create llinfo */ 1641 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1642 in6_ifaddloop(&(ia->ia_ifa)); 1643 } 1644 1645 return (error); 1646 } 1647 1648 struct in6_multi_mship * 1649 in6_joingroup(struct ifnet *ifp, struct in6_addr *addr, int *errorp) 1650 { 1651 struct in6_multi_mship *imm; 1652 1653 imm = kmalloc(sizeof(*imm), M_IPMADDR, M_NOWAIT); 1654 if (!imm) { 1655 *errorp = ENOBUFS; 1656 return NULL; 1657 } 1658 imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp); 1659 if (!imm->i6mm_maddr) { 1660 /* *errorp is alrady set */ 1661 kfree(imm, M_IPMADDR); 1662 return NULL; 1663 } 1664 return imm; 1665 } 1666 1667 int 1668 in6_leavegroup(struct in6_multi_mship *imm) 1669 { 1670 1671 if (imm->i6mm_maddr) 1672 in6_delmulti(imm->i6mm_maddr); 1673 kfree(imm, M_IPMADDR); 1674 return 0; 1675 } 1676 1677 /* 1678 * Add an address to the list of IP6 multicast addresses for a 1679 * given interface. 1680 */ 1681 struct in6_multi * 1682 in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp, int *errorp) 1683 { 1684 struct in6_multi *in6m; 1685 struct sockaddr_in6 sin6; 1686 struct ifmultiaddr *ifma; 1687 1688 *errorp = 0; 1689 1690 crit_enter(); 1691 1692 /* 1693 * Call generic routine to add membership or increment 1694 * refcount. It wants addresses in the form of a sockaddr, 1695 * so we build one here (being careful to zero the unused bytes). 1696 */ 1697 bzero(&sin6, sizeof sin6); 1698 sin6.sin6_family = AF_INET6; 1699 sin6.sin6_len = sizeof sin6; 1700 sin6.sin6_addr = *maddr6; 1701 *errorp = if_addmulti(ifp, (struct sockaddr *)&sin6, &ifma); 1702 if (*errorp) { 1703 crit_exit(); 1704 return 0; 1705 } 1706 1707 /* 1708 * If ifma->ifma_protospec is null, then if_addmulti() created 1709 * a new record. Otherwise, we are done. 1710 */ 1711 if (ifma->ifma_protospec != NULL) { 1712 crit_exit(); 1713 return ifma->ifma_protospec; 1714 } 1715 1716 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 1717 at interrupt time? If so, need to fix if_addmulti. XXX */ 1718 in6m = (struct in6_multi *)kmalloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT); 1719 if (in6m == NULL) { 1720 crit_exit(); 1721 return (NULL); 1722 } 1723 1724 bzero(in6m, sizeof *in6m); 1725 in6m->in6m_addr = *maddr6; 1726 in6m->in6m_ifp = ifp; 1727 in6m->in6m_ifma = ifma; 1728 ifma->ifma_protospec = in6m; 1729 LIST_INSERT_HEAD(&in6_multihead, in6m, in6m_entry); 1730 1731 /* 1732 * Let MLD6 know that we have joined a new IP6 multicast 1733 * group. 1734 */ 1735 mld6_start_listening(in6m); 1736 crit_exit(); 1737 return (in6m); 1738 } 1739 1740 /* 1741 * Delete a multicast address record. 1742 */ 1743 void 1744 in6_delmulti(struct in6_multi *in6m) 1745 { 1746 struct ifmultiaddr *ifma = in6m->in6m_ifma; 1747 1748 crit_enter(); 1749 1750 if (ifma->ifma_refcount == 1) { 1751 /* 1752 * No remaining claims to this record; let MLD6 know 1753 * that we are leaving the multicast group. 1754 */ 1755 mld6_stop_listening(in6m); 1756 ifma->ifma_protospec = NULL; 1757 LIST_REMOVE(in6m, in6m_entry); 1758 kfree(in6m, M_IPMADDR); 1759 } 1760 /* XXX - should be separate API for when we have an ifma? */ 1761 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1762 crit_exit(); 1763 } 1764 1765 /* 1766 * Find an IPv6 interface link-local address specific to an interface. 1767 */ 1768 struct in6_ifaddr * 1769 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1770 { 1771 struct ifaddr_container *ifac; 1772 1773 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1774 struct ifaddr *ifa = ifac->ifa; 1775 1776 if (ifa->ifa_addr == NULL) 1777 continue; /* just for safety */ 1778 if (ifa->ifa_addr->sa_family != AF_INET6) 1779 continue; 1780 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1781 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1782 ignoreflags) != 0) 1783 continue; 1784 break; 1785 } 1786 } 1787 if (ifac != NULL) 1788 return ((struct in6_ifaddr *)(ifac->ifa)); 1789 else 1790 return (NULL); 1791 } 1792 1793 1794 /* 1795 * find the internet address corresponding to a given interface and address. 1796 */ 1797 struct in6_ifaddr * 1798 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr) 1799 { 1800 struct ifaddr_container *ifac; 1801 1802 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1803 struct ifaddr *ifa = ifac->ifa; 1804 1805 if (ifa->ifa_addr == NULL) 1806 continue; /* just for safety */ 1807 if (ifa->ifa_addr->sa_family != AF_INET6) 1808 continue; 1809 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1810 break; 1811 } 1812 if (ifac != NULL) 1813 return ((struct in6_ifaddr *)(ifac->ifa)); 1814 else 1815 return (NULL); 1816 } 1817 1818 /* 1819 * find the internet address on a given interface corresponding to a neighbor's 1820 * address. 1821 */ 1822 struct in6_ifaddr * 1823 in6ifa_ifplocaladdr(const struct ifnet *ifp, const struct in6_addr *addr) 1824 { 1825 struct ifaddr *ifa; 1826 struct in6_ifaddr *ia; 1827 struct ifaddr_container *ifac; 1828 1829 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1830 ifa = ifac->ifa; 1831 1832 if (ifa->ifa_addr == NULL) 1833 continue; /* just for safety */ 1834 if (ifa->ifa_addr->sa_family != AF_INET6) 1835 continue; 1836 ia = (struct in6_ifaddr *)ifa; 1837 if (IN6_ARE_MASKED_ADDR_EQUAL(addr, 1838 &ia->ia_addr.sin6_addr, 1839 &ia->ia_prefixmask.sin6_addr)) 1840 return ia; 1841 } 1842 1843 return NULL; 1844 } 1845 1846 /* 1847 * Convert IP6 address to printable (loggable) representation. 1848 */ 1849 static char digits[] = "0123456789abcdef"; 1850 static int ip6round = 0; 1851 char * 1852 ip6_sprintf(const struct in6_addr *addr) 1853 { 1854 static char ip6buf[8][48]; 1855 int i; 1856 char *cp; 1857 const u_short *a = (const u_short *)addr; 1858 const u_char *d; 1859 int dcolon = 0; 1860 1861 ip6round = (ip6round + 1) & 7; 1862 cp = ip6buf[ip6round]; 1863 1864 for (i = 0; i < 8; i++) { 1865 if (dcolon == 1) { 1866 if (*a == 0) { 1867 if (i == 7) 1868 *cp++ = ':'; 1869 a++; 1870 continue; 1871 } else 1872 dcolon = 2; 1873 } 1874 if (*a == 0) { 1875 if (dcolon == 0 && *(a + 1) == 0) { 1876 if (i == 0) 1877 *cp++ = ':'; 1878 *cp++ = ':'; 1879 dcolon = 1; 1880 } else { 1881 *cp++ = '0'; 1882 *cp++ = ':'; 1883 } 1884 a++; 1885 continue; 1886 } 1887 d = (const u_char *)a; 1888 *cp++ = digits[*d >> 4]; 1889 *cp++ = digits[*d++ & 0xf]; 1890 *cp++ = digits[*d >> 4]; 1891 *cp++ = digits[*d & 0xf]; 1892 *cp++ = ':'; 1893 a++; 1894 } 1895 *--cp = 0; 1896 return (ip6buf[ip6round]); 1897 } 1898 1899 int 1900 in6_localaddr(struct in6_addr *in6) 1901 { 1902 struct in6_ifaddr *ia; 1903 1904 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1905 return 1; 1906 1907 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 1908 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1909 &ia->ia_prefixmask.sin6_addr)) 1910 return 1; 1911 1912 return (0); 1913 } 1914 1915 int 1916 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1917 { 1918 struct in6_ifaddr *ia; 1919 1920 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1921 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1922 &sa6->sin6_addr) && 1923 (ia->ia6_flags & IN6_IFF_DEPRECATED)) 1924 return (1); /* true */ 1925 1926 /* XXX: do we still have to go thru the rest of the list? */ 1927 } 1928 1929 return (0); /* false */ 1930 } 1931 1932 /* 1933 * return length of part which dst and src are equal 1934 * hard coding... 1935 */ 1936 int 1937 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1938 { 1939 int match = 0; 1940 u_char *s = (u_char *)src, *d = (u_char *)dst; 1941 u_char *lim = s + 16, r; 1942 1943 while (s < lim) 1944 if ((r = (*d++ ^ *s++)) != 0) { 1945 while (r < 128) { 1946 match++; 1947 r <<= 1; 1948 } 1949 break; 1950 } else 1951 match += 8; 1952 return match; 1953 } 1954 1955 /* XXX: to be scope conscious */ 1956 int 1957 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1958 { 1959 int bytelen, bitlen; 1960 1961 /* sanity check */ 1962 if (0 > len || len > 128) { 1963 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1964 len); 1965 return (0); 1966 } 1967 1968 bytelen = len / 8; 1969 bitlen = len % 8; 1970 1971 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1972 return (0); 1973 if (p1->s6_addr[bytelen] >> (8 - bitlen) != 1974 p2->s6_addr[bytelen] >> (8 - bitlen)) 1975 return (0); 1976 1977 return (1); 1978 } 1979 1980 void 1981 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1982 { 1983 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1984 int bytelen, bitlen, i; 1985 1986 /* sanity check */ 1987 if (0 > len || len > 128) { 1988 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1989 len); 1990 return; 1991 } 1992 1993 bzero(maskp, sizeof(*maskp)); 1994 bytelen = len / 8; 1995 bitlen = len % 8; 1996 for (i = 0; i < bytelen; i++) 1997 maskp->s6_addr[i] = 0xff; 1998 if (bitlen) 1999 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 2000 } 2001 2002 /* 2003 * return the best address out of the same scope 2004 */ 2005 struct in6_ifaddr * 2006 in6_ifawithscope(struct ifnet *oifp, struct in6_addr *dst) 2007 { 2008 int dst_scope = in6_addrscope(dst), src_scope, best_scope = 0; 2009 int blen = -1; 2010 struct ifnet *ifp; 2011 struct in6_ifaddr *ifa_best = NULL; 2012 2013 if (oifp == NULL) { 2014 #if 0 2015 kprintf("in6_ifawithscope: output interface is not specified\n"); 2016 #endif 2017 return (NULL); 2018 } 2019 2020 /* 2021 * We search for all addresses on all interfaces from the beginning. 2022 * Comparing an interface with the outgoing interface will be done 2023 * only at the final stage of tiebreaking. 2024 */ 2025 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 2026 { 2027 struct ifaddr_container *ifac; 2028 2029 /* 2030 * We can never take an address that breaks the scope zone 2031 * of the destination. 2032 */ 2033 if (in6_addr2scopeid(ifp, dst) != in6_addr2scopeid(oifp, dst)) 2034 continue; 2035 2036 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2037 int tlen = -1, dscopecmp, bscopecmp, matchcmp; 2038 struct ifaddr *ifa = ifac->ifa; 2039 2040 if (ifa->ifa_addr->sa_family != AF_INET6) 2041 continue; 2042 2043 src_scope = in6_addrscope(IFA_IN6(ifa)); 2044 2045 /* 2046 * Don't use an address before completing DAD 2047 * nor a duplicated address. 2048 */ 2049 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2050 IN6_IFF_NOTREADY) 2051 continue; 2052 2053 /* XXX: is there any case to allow anycasts? */ 2054 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2055 IN6_IFF_ANYCAST) 2056 continue; 2057 2058 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2059 IN6_IFF_DETACHED) 2060 continue; 2061 2062 /* 2063 * If this is the first address we find, 2064 * keep it anyway. 2065 */ 2066 if (ifa_best == NULL) 2067 goto replace; 2068 2069 /* 2070 * ifa_best is never NULL beyond this line except 2071 * within the block labeled "replace". 2072 */ 2073 2074 /* 2075 * If ifa_best has a smaller scope than dst and 2076 * the current address has a larger one than 2077 * (or equal to) dst, always replace ifa_best. 2078 * Also, if the current address has a smaller scope 2079 * than dst, ignore it unless ifa_best also has a 2080 * smaller scope. 2081 * Consequently, after the two if-clause below, 2082 * the followings must be satisfied: 2083 * (scope(src) < scope(dst) && 2084 * scope(best) < scope(dst)) 2085 * OR 2086 * (scope(best) >= scope(dst) && 2087 * scope(src) >= scope(dst)) 2088 */ 2089 if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0 && 2090 IN6_ARE_SCOPE_CMP(src_scope, dst_scope) >= 0) 2091 goto replace; /* (A) */ 2092 if (IN6_ARE_SCOPE_CMP(src_scope, dst_scope) < 0 && 2093 IN6_ARE_SCOPE_CMP(best_scope, dst_scope) >= 0) 2094 continue; /* (B) */ 2095 2096 /* 2097 * A deprecated address SHOULD NOT be used in new 2098 * communications if an alternate (non-deprecated) 2099 * address is available and has sufficient scope. 2100 * RFC 2462, Section 5.5.4. 2101 */ 2102 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2103 IN6_IFF_DEPRECATED) { 2104 /* 2105 * Ignore any deprecated addresses if 2106 * specified by configuration. 2107 */ 2108 if (!ip6_use_deprecated) 2109 continue; 2110 2111 /* 2112 * If we have already found a non-deprecated 2113 * candidate, just ignore deprecated addresses. 2114 */ 2115 if (!(ifa_best->ia6_flags & IN6_IFF_DEPRECATED)) 2116 continue; 2117 } 2118 2119 /* 2120 * A non-deprecated address is always preferred 2121 * to a deprecated one regardless of scopes and 2122 * address matching (Note invariants ensured by the 2123 * conditions (A) and (B) above.) 2124 */ 2125 if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) && 2126 !(((struct in6_ifaddr *)ifa)->ia6_flags & 2127 IN6_IFF_DEPRECATED)) 2128 goto replace; 2129 2130 /* 2131 * When we use temporary addresses described in 2132 * RFC 3041, we prefer temporary addresses to 2133 * public autoconf addresses. Again, note the 2134 * invariants from (A) and (B). Also note that we 2135 * don't have any preference between static addresses 2136 * and autoconf addresses (despite of whether or not 2137 * the latter is temporary or public.) 2138 */ 2139 if (ip6_use_tempaddr) { 2140 struct in6_ifaddr *ifat; 2141 2142 ifat = (struct in6_ifaddr *)ifa; 2143 if ((ifa_best->ia6_flags & 2144 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2145 == IN6_IFF_AUTOCONF && 2146 (ifat->ia6_flags & 2147 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2148 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) { 2149 goto replace; 2150 } 2151 if ((ifa_best->ia6_flags & 2152 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2153 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY) && 2154 (ifat->ia6_flags & 2155 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2156 == IN6_IFF_AUTOCONF) { 2157 continue; 2158 } 2159 } 2160 2161 /* 2162 * At this point, we have two cases: 2163 * 1. we are looking at a non-deprecated address, 2164 * and ifa_best is also non-deprecated. 2165 * 2. we are looking at a deprecated address, 2166 * and ifa_best is also deprecated. 2167 * Also, we do not have to consider a case where 2168 * the scope of if_best is larger(smaller) than dst and 2169 * the scope of the current address is smaller(larger) 2170 * than dst. Such a case has already been covered. 2171 * Tiebreaking is done according to the following 2172 * items: 2173 * - the scope comparison between the address and 2174 * dst (dscopecmp) 2175 * - the scope comparison between the address and 2176 * ifa_best (bscopecmp) 2177 * - if the address match dst longer than ifa_best 2178 * (matchcmp) 2179 * - if the address is on the outgoing I/F (outI/F) 2180 * 2181 * Roughly speaking, the selection policy is 2182 * - the most important item is scope. The same scope 2183 * is best. Then search for a larger scope. 2184 * Smaller scopes are the last resort. 2185 * - A deprecated address is chosen only when we have 2186 * no address that has an enough scope, but is 2187 * prefered to any addresses of smaller scopes 2188 * (this must be already done above.) 2189 * - addresses on the outgoing I/F are preferred to 2190 * ones on other interfaces if none of above 2191 * tiebreaks. In the table below, the column "bI" 2192 * means if the best_ifa is on the outgoing 2193 * interface, and the column "sI" means if the ifa 2194 * is on the outgoing interface. 2195 * - If there is no other reasons to choose one, 2196 * longest address match against dst is considered. 2197 * 2198 * The precise decision table is as follows: 2199 * dscopecmp bscopecmp match bI oI | replace? 2200 * N/A equal N/A Y N | No (1) 2201 * N/A equal N/A N Y | Yes (2) 2202 * N/A equal larger N/A | Yes (3) 2203 * N/A equal !larger N/A | No (4) 2204 * larger larger N/A N/A | No (5) 2205 * larger smaller N/A N/A | Yes (6) 2206 * smaller larger N/A N/A | Yes (7) 2207 * smaller smaller N/A N/A | No (8) 2208 * equal smaller N/A N/A | Yes (9) 2209 * equal larger (already done at A above) 2210 */ 2211 dscopecmp = IN6_ARE_SCOPE_CMP(src_scope, dst_scope); 2212 bscopecmp = IN6_ARE_SCOPE_CMP(src_scope, best_scope); 2213 2214 if (bscopecmp == 0) { 2215 struct ifnet *bifp = ifa_best->ia_ifp; 2216 2217 if (bifp == oifp && ifp != oifp) /* (1) */ 2218 continue; 2219 if (bifp != oifp && ifp == oifp) /* (2) */ 2220 goto replace; 2221 2222 /* 2223 * Both bifp and ifp are on the outgoing 2224 * interface, or both two are on a different 2225 * interface from the outgoing I/F. 2226 * now we need address matching against dst 2227 * for tiebreaking. 2228 */ 2229 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2230 matchcmp = tlen - blen; 2231 if (matchcmp > 0) /* (3) */ 2232 goto replace; 2233 continue; /* (4) */ 2234 } 2235 if (dscopecmp > 0) { 2236 if (bscopecmp > 0) /* (5) */ 2237 continue; 2238 goto replace; /* (6) */ 2239 } 2240 if (dscopecmp < 0) { 2241 if (bscopecmp > 0) /* (7) */ 2242 goto replace; 2243 continue; /* (8) */ 2244 } 2245 2246 /* now dscopecmp must be 0 */ 2247 if (bscopecmp < 0) 2248 goto replace; /* (9) */ 2249 2250 replace: 2251 ifa_best = (struct in6_ifaddr *)ifa; 2252 blen = tlen >= 0 ? tlen : 2253 in6_matchlen(IFA_IN6(ifa), dst); 2254 best_scope = in6_addrscope(&ifa_best->ia_addr.sin6_addr); 2255 } 2256 } 2257 2258 /* count statistics for future improvements */ 2259 if (ifa_best == NULL) 2260 ip6stat.ip6s_sources_none++; 2261 else { 2262 if (oifp == ifa_best->ia_ifp) 2263 ip6stat.ip6s_sources_sameif[best_scope]++; 2264 else 2265 ip6stat.ip6s_sources_otherif[best_scope]++; 2266 2267 if (best_scope == dst_scope) 2268 ip6stat.ip6s_sources_samescope[best_scope]++; 2269 else 2270 ip6stat.ip6s_sources_otherscope[best_scope]++; 2271 2272 if (ifa_best->ia6_flags & IN6_IFF_DEPRECATED) 2273 ip6stat.ip6s_sources_deprecated[best_scope]++; 2274 } 2275 2276 return (ifa_best); 2277 } 2278 2279 /* 2280 * return the best address out of the same scope. if no address was 2281 * found, return the first valid address from designated IF. 2282 */ 2283 struct in6_ifaddr * 2284 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2285 { 2286 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2287 struct ifaddr_container *ifac; 2288 struct in6_ifaddr *besta = NULL; 2289 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2290 2291 dep[0] = dep[1] = NULL; 2292 2293 /* 2294 * We first look for addresses in the same scope. 2295 * If there is one, return it. 2296 * If two or more, return one which matches the dst longest. 2297 * If none, return one of global addresses assigned other ifs. 2298 */ 2299 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2300 struct ifaddr *ifa = ifac->ifa; 2301 2302 if (ifa->ifa_addr->sa_family != AF_INET6) 2303 continue; 2304 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2305 continue; /* XXX: is there any case to allow anycast? */ 2306 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2307 continue; /* don't use this interface */ 2308 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2309 continue; 2310 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2311 if (ip6_use_deprecated) 2312 dep[0] = (struct in6_ifaddr *)ifa; 2313 continue; 2314 } 2315 2316 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2317 /* 2318 * call in6_matchlen() as few as possible 2319 */ 2320 if (besta) { 2321 if (blen == -1) 2322 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2323 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2324 if (tlen > blen) { 2325 blen = tlen; 2326 besta = (struct in6_ifaddr *)ifa; 2327 } 2328 } else 2329 besta = (struct in6_ifaddr *)ifa; 2330 } 2331 } 2332 if (besta) 2333 return (besta); 2334 2335 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2336 struct ifaddr *ifa = ifac->ifa; 2337 2338 if (ifa->ifa_addr->sa_family != AF_INET6) 2339 continue; 2340 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2341 continue; /* XXX: is there any case to allow anycast? */ 2342 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2343 continue; /* don't use this interface */ 2344 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2345 continue; 2346 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2347 if (ip6_use_deprecated) 2348 dep[1] = (struct in6_ifaddr *)ifa; 2349 continue; 2350 } 2351 2352 return (struct in6_ifaddr *)ifa; 2353 } 2354 2355 /* use the last-resort values, that are, deprecated addresses */ 2356 if (dep[0]) 2357 return dep[0]; 2358 if (dep[1]) 2359 return dep[1]; 2360 2361 return NULL; 2362 } 2363 2364 /* 2365 * perform DAD when interface becomes IFF_UP. 2366 */ 2367 void 2368 in6_if_up(struct ifnet *ifp) 2369 { 2370 struct ifaddr_container *ifac; 2371 struct in6_ifaddr *ia; 2372 int dad_delay; /* delay ticks before DAD output */ 2373 2374 /* 2375 * special cases, like 6to4, are handled in in6_ifattach 2376 */ 2377 in6_ifattach(ifp, NULL); 2378 2379 dad_delay = 0; 2380 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2381 struct ifaddr *ifa = ifac->ifa; 2382 2383 if (ifa->ifa_addr->sa_family != AF_INET6) 2384 continue; 2385 ia = (struct in6_ifaddr *)ifa; 2386 if (ia->ia6_flags & IN6_IFF_TENTATIVE) 2387 nd6_dad_start(ifa, &dad_delay); 2388 } 2389 } 2390 2391 int 2392 in6if_do_dad(struct ifnet *ifp) 2393 { 2394 if (ifp->if_flags & IFF_LOOPBACK) 2395 return (0); 2396 2397 switch (ifp->if_type) { 2398 #ifdef IFT_DUMMY 2399 case IFT_DUMMY: 2400 #endif 2401 case IFT_FAITH: 2402 /* 2403 * These interfaces do not have the IFF_LOOPBACK flag, 2404 * but loop packets back. We do not have to do DAD on such 2405 * interfaces. We should even omit it, because loop-backed 2406 * NS would confuse the DAD procedure. 2407 */ 2408 return (0); 2409 default: 2410 /* 2411 * Our DAD routine requires the interface up and running. 2412 * However, some interfaces can be up before the RUNNING 2413 * status. Additionaly, users may try to assign addresses 2414 * before the interface becomes up (or running). 2415 * We simply skip DAD in such a case as a work around. 2416 * XXX: we should rather mark "tentative" on such addresses, 2417 * and do DAD after the interface becomes ready. 2418 */ 2419 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != 2420 (IFF_UP|IFF_RUNNING)) 2421 return (0); 2422 2423 return (1); 2424 } 2425 } 2426 2427 /* 2428 * Calculate max IPv6 MTU through all the interfaces and store it 2429 * to in6_maxmtu. 2430 */ 2431 void 2432 in6_setmaxmtu(void) 2433 { 2434 unsigned long maxmtu = 0; 2435 struct ifnet *ifp; 2436 2437 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 2438 { 2439 /* this function can be called during ifnet initialization */ 2440 if (!ifp->if_afdata[AF_INET6]) 2441 continue; 2442 if (!(ifp->if_flags & IFF_LOOPBACK) && 2443 ND_IFINFO(ifp)->linkmtu > maxmtu) 2444 maxmtu = ND_IFINFO(ifp)->linkmtu; 2445 } 2446 if (maxmtu) /* update only when maxmtu is positive */ 2447 in6_maxmtu = maxmtu; 2448 } 2449 2450 void * 2451 in6_domifattach(struct ifnet *ifp) 2452 { 2453 struct in6_ifextra *ext; 2454 2455 ext = (struct in6_ifextra *)kmalloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2456 bzero(ext, sizeof(*ext)); 2457 2458 ext->in6_ifstat = (struct in6_ifstat *)kmalloc(sizeof(struct in6_ifstat), 2459 M_IFADDR, M_WAITOK); 2460 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat)); 2461 2462 ext->icmp6_ifstat = 2463 (struct icmp6_ifstat *)kmalloc(sizeof(struct icmp6_ifstat), 2464 M_IFADDR, M_WAITOK); 2465 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat)); 2466 2467 ext->nd_ifinfo = nd6_ifattach(ifp); 2468 ext->scope6_id = scope6_ifattach(ifp); 2469 return ext; 2470 } 2471 2472 void 2473 in6_domifdetach(struct ifnet *ifp, void *aux) 2474 { 2475 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2476 scope6_ifdetach(ext->scope6_id); 2477 nd6_ifdetach(ext->nd_ifinfo); 2478 kfree(ext->in6_ifstat, M_IFADDR); 2479 kfree(ext->icmp6_ifstat, M_IFADDR); 2480 kfree(ext, M_IFADDR); 2481 } 2482 2483 /* 2484 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2485 * v4 mapped addr or v4 compat addr 2486 */ 2487 void 2488 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2489 { 2490 bzero(sin, sizeof(*sin)); 2491 sin->sin_len = sizeof(struct sockaddr_in); 2492 sin->sin_family = AF_INET; 2493 sin->sin_port = sin6->sin6_port; 2494 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2495 } 2496 2497 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2498 void 2499 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2500 { 2501 bzero(sin6, sizeof(*sin6)); 2502 sin6->sin6_len = sizeof(struct sockaddr_in6); 2503 sin6->sin6_family = AF_INET6; 2504 sin6->sin6_port = sin->sin_port; 2505 sin6->sin6_addr.s6_addr32[0] = 0; 2506 sin6->sin6_addr.s6_addr32[1] = 0; 2507 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2508 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2509 } 2510 2511 /* Convert sockaddr_in6 into sockaddr_in. */ 2512 void 2513 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2514 { 2515 struct sockaddr_in *sin_p; 2516 struct sockaddr_in6 sin6; 2517 2518 /* 2519 * Save original sockaddr_in6 addr and convert it 2520 * to sockaddr_in. 2521 */ 2522 sin6 = *(struct sockaddr_in6 *)nam; 2523 sin_p = (struct sockaddr_in *)nam; 2524 in6_sin6_2_sin(sin_p, &sin6); 2525 } 2526 2527 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2528 void 2529 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2530 { 2531 struct sockaddr_in *sin_p; 2532 struct sockaddr_in6 *sin6_p; 2533 2534 sin6_p = kmalloc(sizeof *sin6_p, M_SONAME, M_WAITOK); 2535 sin_p = (struct sockaddr_in *)*nam; 2536 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2537 kfree(*nam, M_SONAME); 2538 *nam = (struct sockaddr *)sin6_p; 2539 } 2540