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 1.24 2006/12/22 23:57:53 swildner 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 static 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 static 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 /* 1618 * Add an address to the list of IP6 multicast addresses for a 1619 * given interface. 1620 */ 1621 struct in6_multi * 1622 in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp, int *errorp) 1623 { 1624 struct in6_multi *in6m; 1625 struct sockaddr_in6 sin6; 1626 struct ifmultiaddr *ifma; 1627 1628 *errorp = 0; 1629 1630 crit_enter(); 1631 1632 /* 1633 * Call generic routine to add membership or increment 1634 * refcount. It wants addresses in the form of a sockaddr, 1635 * so we build one here (being careful to zero the unused bytes). 1636 */ 1637 bzero(&sin6, sizeof sin6); 1638 sin6.sin6_family = AF_INET6; 1639 sin6.sin6_len = sizeof sin6; 1640 sin6.sin6_addr = *maddr6; 1641 *errorp = if_addmulti(ifp, (struct sockaddr *)&sin6, &ifma); 1642 if (*errorp) { 1643 crit_exit(); 1644 return 0; 1645 } 1646 1647 /* 1648 * If ifma->ifma_protospec is null, then if_addmulti() created 1649 * a new record. Otherwise, we are done. 1650 */ 1651 if (ifma->ifma_protospec != 0) { 1652 crit_exit(); 1653 return ifma->ifma_protospec; 1654 } 1655 1656 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 1657 at interrupt time? If so, need to fix if_addmulti. XXX */ 1658 in6m = (struct in6_multi *)kmalloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT); 1659 if (in6m == NULL) { 1660 crit_exit(); 1661 return (NULL); 1662 } 1663 1664 bzero(in6m, sizeof *in6m); 1665 in6m->in6m_addr = *maddr6; 1666 in6m->in6m_ifp = ifp; 1667 in6m->in6m_ifma = ifma; 1668 ifma->ifma_protospec = in6m; 1669 LIST_INSERT_HEAD(&in6_multihead, in6m, in6m_entry); 1670 1671 /* 1672 * Let MLD6 know that we have joined a new IP6 multicast 1673 * group. 1674 */ 1675 mld6_start_listening(in6m); 1676 crit_exit(); 1677 return (in6m); 1678 } 1679 1680 /* 1681 * Delete a multicast address record. 1682 */ 1683 void 1684 in6_delmulti(struct in6_multi *in6m) 1685 { 1686 struct ifmultiaddr *ifma = in6m->in6m_ifma; 1687 1688 crit_enter(); 1689 1690 if (ifma->ifma_refcount == 1) { 1691 /* 1692 * No remaining claims to this record; let MLD6 know 1693 * that we are leaving the multicast group. 1694 */ 1695 mld6_stop_listening(in6m); 1696 ifma->ifma_protospec = 0; 1697 LIST_REMOVE(in6m, in6m_entry); 1698 kfree(in6m, M_IPMADDR); 1699 } 1700 /* XXX - should be separate API for when we have an ifma? */ 1701 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1702 crit_exit(); 1703 } 1704 1705 /* 1706 * Find an IPv6 interface link-local address specific to an interface. 1707 */ 1708 struct in6_ifaddr * 1709 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1710 { 1711 struct ifaddr *ifa; 1712 1713 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1714 { 1715 if (ifa->ifa_addr == NULL) 1716 continue; /* just for safety */ 1717 if (ifa->ifa_addr->sa_family != AF_INET6) 1718 continue; 1719 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1720 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1721 ignoreflags) != 0) 1722 continue; 1723 break; 1724 } 1725 } 1726 1727 return ((struct in6_ifaddr *)ifa); 1728 } 1729 1730 1731 /* 1732 * find the internet address corresponding to a given interface and address. 1733 */ 1734 struct in6_ifaddr * 1735 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr) 1736 { 1737 struct ifaddr *ifa; 1738 1739 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1740 { 1741 if (ifa->ifa_addr == NULL) 1742 continue; /* just for safety */ 1743 if (ifa->ifa_addr->sa_family != AF_INET6) 1744 continue; 1745 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1746 break; 1747 } 1748 1749 return ((struct in6_ifaddr *)ifa); 1750 } 1751 1752 /* 1753 * Convert IP6 address to printable (loggable) representation. 1754 */ 1755 static char digits[] = "0123456789abcdef"; 1756 static int ip6round = 0; 1757 char * 1758 ip6_sprintf(const struct in6_addr *addr) 1759 { 1760 static char ip6buf[8][48]; 1761 int i; 1762 char *cp; 1763 const u_short *a = (const u_short *)addr; 1764 const u_char *d; 1765 int dcolon = 0; 1766 1767 ip6round = (ip6round + 1) & 7; 1768 cp = ip6buf[ip6round]; 1769 1770 for (i = 0; i < 8; i++) { 1771 if (dcolon == 1) { 1772 if (*a == 0) { 1773 if (i == 7) 1774 *cp++ = ':'; 1775 a++; 1776 continue; 1777 } else 1778 dcolon = 2; 1779 } 1780 if (*a == 0) { 1781 if (dcolon == 0 && *(a + 1) == 0) { 1782 if (i == 0) 1783 *cp++ = ':'; 1784 *cp++ = ':'; 1785 dcolon = 1; 1786 } else { 1787 *cp++ = '0'; 1788 *cp++ = ':'; 1789 } 1790 a++; 1791 continue; 1792 } 1793 d = (const u_char *)a; 1794 *cp++ = digits[*d >> 4]; 1795 *cp++ = digits[*d++ & 0xf]; 1796 *cp++ = digits[*d >> 4]; 1797 *cp++ = digits[*d & 0xf]; 1798 *cp++ = ':'; 1799 a++; 1800 } 1801 *--cp = 0; 1802 return (ip6buf[ip6round]); 1803 } 1804 1805 int 1806 in6_localaddr(struct in6_addr *in6) 1807 { 1808 struct in6_ifaddr *ia; 1809 1810 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1811 return 1; 1812 1813 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 1814 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1815 &ia->ia_prefixmask.sin6_addr)) 1816 return 1; 1817 1818 return (0); 1819 } 1820 1821 int 1822 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1823 { 1824 struct in6_ifaddr *ia; 1825 1826 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1827 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1828 &sa6->sin6_addr) && 1829 (ia->ia6_flags & IN6_IFF_DEPRECATED)) 1830 return (1); /* true */ 1831 1832 /* XXX: do we still have to go thru the rest of the list? */ 1833 } 1834 1835 return (0); /* false */ 1836 } 1837 1838 /* 1839 * return length of part which dst and src are equal 1840 * hard coding... 1841 */ 1842 int 1843 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1844 { 1845 int match = 0; 1846 u_char *s = (u_char *)src, *d = (u_char *)dst; 1847 u_char *lim = s + 16, r; 1848 1849 while (s < lim) 1850 if ((r = (*d++ ^ *s++)) != 0) { 1851 while (r < 128) { 1852 match++; 1853 r <<= 1; 1854 } 1855 break; 1856 } else 1857 match += 8; 1858 return match; 1859 } 1860 1861 /* XXX: to be scope conscious */ 1862 int 1863 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1864 { 1865 int bytelen, bitlen; 1866 1867 /* sanity check */ 1868 if (0 > len || len > 128) { 1869 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1870 len); 1871 return (0); 1872 } 1873 1874 bytelen = len / 8; 1875 bitlen = len % 8; 1876 1877 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1878 return (0); 1879 if (p1->s6_addr[bytelen] >> (8 - bitlen) != 1880 p2->s6_addr[bytelen] >> (8 - bitlen)) 1881 return (0); 1882 1883 return (1); 1884 } 1885 1886 void 1887 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1888 { 1889 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1890 int bytelen, bitlen, i; 1891 1892 /* sanity check */ 1893 if (0 > len || len > 128) { 1894 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1895 len); 1896 return; 1897 } 1898 1899 bzero(maskp, sizeof(*maskp)); 1900 bytelen = len / 8; 1901 bitlen = len % 8; 1902 for (i = 0; i < bytelen; i++) 1903 maskp->s6_addr[i] = 0xff; 1904 if (bitlen) 1905 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1906 } 1907 1908 /* 1909 * return the best address out of the same scope 1910 */ 1911 struct in6_ifaddr * 1912 in6_ifawithscope(struct ifnet *oifp, struct in6_addr *dst) 1913 { 1914 int dst_scope = in6_addrscope(dst), src_scope, best_scope = 0; 1915 int blen = -1; 1916 struct ifaddr *ifa; 1917 struct ifnet *ifp; 1918 struct in6_ifaddr *ifa_best = NULL; 1919 1920 if (oifp == NULL) { 1921 #if 0 1922 kprintf("in6_ifawithscope: output interface is not specified\n"); 1923 #endif 1924 return (NULL); 1925 } 1926 1927 /* 1928 * We search for all addresses on all interfaces from the beginning. 1929 * Comparing an interface with the outgoing interface will be done 1930 * only at the final stage of tiebreaking. 1931 */ 1932 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1933 { 1934 /* 1935 * We can never take an address that breaks the scope zone 1936 * of the destination. 1937 */ 1938 if (in6_addr2scopeid(ifp, dst) != in6_addr2scopeid(oifp, dst)) 1939 continue; 1940 1941 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1942 { 1943 int tlen = -1, dscopecmp, bscopecmp, matchcmp; 1944 1945 if (ifa->ifa_addr->sa_family != AF_INET6) 1946 continue; 1947 1948 src_scope = in6_addrscope(IFA_IN6(ifa)); 1949 1950 /* 1951 * Don't use an address before completing DAD 1952 * nor a duplicated address. 1953 */ 1954 if (((struct in6_ifaddr *)ifa)->ia6_flags & 1955 IN6_IFF_NOTREADY) 1956 continue; 1957 1958 /* XXX: is there any case to allow anycasts? */ 1959 if (((struct in6_ifaddr *)ifa)->ia6_flags & 1960 IN6_IFF_ANYCAST) 1961 continue; 1962 1963 if (((struct in6_ifaddr *)ifa)->ia6_flags & 1964 IN6_IFF_DETACHED) 1965 continue; 1966 1967 /* 1968 * If this is the first address we find, 1969 * keep it anyway. 1970 */ 1971 if (ifa_best == NULL) 1972 goto replace; 1973 1974 /* 1975 * ifa_best is never NULL beyond this line except 1976 * within the block labeled "replace". 1977 */ 1978 1979 /* 1980 * If ifa_best has a smaller scope than dst and 1981 * the current address has a larger one than 1982 * (or equal to) dst, always replace ifa_best. 1983 * Also, if the current address has a smaller scope 1984 * than dst, ignore it unless ifa_best also has a 1985 * smaller scope. 1986 * Consequently, after the two if-clause below, 1987 * the followings must be satisfied: 1988 * (scope(src) < scope(dst) && 1989 * scope(best) < scope(dst)) 1990 * OR 1991 * (scope(best) >= scope(dst) && 1992 * scope(src) >= scope(dst)) 1993 */ 1994 if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0 && 1995 IN6_ARE_SCOPE_CMP(src_scope, dst_scope) >= 0) 1996 goto replace; /* (A) */ 1997 if (IN6_ARE_SCOPE_CMP(src_scope, dst_scope) < 0 && 1998 IN6_ARE_SCOPE_CMP(best_scope, dst_scope) >= 0) 1999 continue; /* (B) */ 2000 2001 /* 2002 * A deprecated address SHOULD NOT be used in new 2003 * communications if an alternate (non-deprecated) 2004 * address is available and has sufficient scope. 2005 * RFC 2462, Section 5.5.4. 2006 */ 2007 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2008 IN6_IFF_DEPRECATED) { 2009 /* 2010 * Ignore any deprecated addresses if 2011 * specified by configuration. 2012 */ 2013 if (!ip6_use_deprecated) 2014 continue; 2015 2016 /* 2017 * If we have already found a non-deprecated 2018 * candidate, just ignore deprecated addresses. 2019 */ 2020 if (!(ifa_best->ia6_flags & IN6_IFF_DEPRECATED)) 2021 continue; 2022 } 2023 2024 /* 2025 * A non-deprecated address is always preferred 2026 * to a deprecated one regardless of scopes and 2027 * address matching (Note invariants ensured by the 2028 * conditions (A) and (B) above.) 2029 */ 2030 if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) && 2031 !(((struct in6_ifaddr *)ifa)->ia6_flags & 2032 IN6_IFF_DEPRECATED)) 2033 goto replace; 2034 2035 /* 2036 * When we use temporary addresses described in 2037 * RFC 3041, we prefer temporary addresses to 2038 * public autoconf addresses. Again, note the 2039 * invariants from (A) and (B). Also note that we 2040 * don't have any preference between static addresses 2041 * and autoconf addresses (despite of whether or not 2042 * the latter is temporary or public.) 2043 */ 2044 if (ip6_use_tempaddr) { 2045 struct in6_ifaddr *ifat; 2046 2047 ifat = (struct in6_ifaddr *)ifa; 2048 if ((ifa_best->ia6_flags & 2049 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2050 == IN6_IFF_AUTOCONF && 2051 (ifat->ia6_flags & 2052 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2053 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) { 2054 goto replace; 2055 } 2056 if ((ifa_best->ia6_flags & 2057 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2058 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY) && 2059 (ifat->ia6_flags & 2060 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2061 == IN6_IFF_AUTOCONF) { 2062 continue; 2063 } 2064 } 2065 2066 /* 2067 * At this point, we have two cases: 2068 * 1. we are looking at a non-deprecated address, 2069 * and ifa_best is also non-deprecated. 2070 * 2. we are looking at a deprecated address, 2071 * and ifa_best is also deprecated. 2072 * Also, we do not have to consider a case where 2073 * the scope of if_best is larger(smaller) than dst and 2074 * the scope of the current address is smaller(larger) 2075 * than dst. Such a case has already been covered. 2076 * Tiebreaking is done according to the following 2077 * items: 2078 * - the scope comparison between the address and 2079 * dst (dscopecmp) 2080 * - the scope comparison between the address and 2081 * ifa_best (bscopecmp) 2082 * - if the address match dst longer than ifa_best 2083 * (matchcmp) 2084 * - if the address is on the outgoing I/F (outI/F) 2085 * 2086 * Roughly speaking, the selection policy is 2087 * - the most important item is scope. The same scope 2088 * is best. Then search for a larger scope. 2089 * Smaller scopes are the last resort. 2090 * - A deprecated address is chosen only when we have 2091 * no address that has an enough scope, but is 2092 * prefered to any addresses of smaller scopes 2093 * (this must be already done above.) 2094 * - addresses on the outgoing I/F are preferred to 2095 * ones on other interfaces if none of above 2096 * tiebreaks. In the table below, the column "bI" 2097 * means if the best_ifa is on the outgoing 2098 * interface, and the column "sI" means if the ifa 2099 * is on the outgoing interface. 2100 * - If there is no other reasons to choose one, 2101 * longest address match against dst is considered. 2102 * 2103 * The precise decision table is as follows: 2104 * dscopecmp bscopecmp match bI oI | replace? 2105 * N/A equal N/A Y N | No (1) 2106 * N/A equal N/A N Y | Yes (2) 2107 * N/A equal larger N/A | Yes (3) 2108 * N/A equal !larger N/A | No (4) 2109 * larger larger N/A N/A | No (5) 2110 * larger smaller N/A N/A | Yes (6) 2111 * smaller larger N/A N/A | Yes (7) 2112 * smaller smaller N/A N/A | No (8) 2113 * equal smaller N/A N/A | Yes (9) 2114 * equal larger (already done at A above) 2115 */ 2116 dscopecmp = IN6_ARE_SCOPE_CMP(src_scope, dst_scope); 2117 bscopecmp = IN6_ARE_SCOPE_CMP(src_scope, best_scope); 2118 2119 if (bscopecmp == 0) { 2120 struct ifnet *bifp = ifa_best->ia_ifp; 2121 2122 if (bifp == oifp && ifp != oifp) /* (1) */ 2123 continue; 2124 if (bifp != oifp && ifp == oifp) /* (2) */ 2125 goto replace; 2126 2127 /* 2128 * Both bifp and ifp are on the outgoing 2129 * interface, or both two are on a different 2130 * interface from the outgoing I/F. 2131 * now we need address matching against dst 2132 * for tiebreaking. 2133 */ 2134 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2135 matchcmp = tlen - blen; 2136 if (matchcmp > 0) /* (3) */ 2137 goto replace; 2138 continue; /* (4) */ 2139 } 2140 if (dscopecmp > 0) { 2141 if (bscopecmp > 0) /* (5) */ 2142 continue; 2143 goto replace; /* (6) */ 2144 } 2145 if (dscopecmp < 0) { 2146 if (bscopecmp > 0) /* (7) */ 2147 goto replace; 2148 continue; /* (8) */ 2149 } 2150 2151 /* now dscopecmp must be 0 */ 2152 if (bscopecmp < 0) 2153 goto replace; /* (9) */ 2154 2155 replace: 2156 ifa_best = (struct in6_ifaddr *)ifa; 2157 blen = tlen >= 0 ? tlen : 2158 in6_matchlen(IFA_IN6(ifa), dst); 2159 best_scope = in6_addrscope(&ifa_best->ia_addr.sin6_addr); 2160 } 2161 } 2162 2163 /* count statistics for future improvements */ 2164 if (ifa_best == NULL) 2165 ip6stat.ip6s_sources_none++; 2166 else { 2167 if (oifp == ifa_best->ia_ifp) 2168 ip6stat.ip6s_sources_sameif[best_scope]++; 2169 else 2170 ip6stat.ip6s_sources_otherif[best_scope]++; 2171 2172 if (best_scope == dst_scope) 2173 ip6stat.ip6s_sources_samescope[best_scope]++; 2174 else 2175 ip6stat.ip6s_sources_otherscope[best_scope]++; 2176 2177 if (ifa_best->ia6_flags & IN6_IFF_DEPRECATED) 2178 ip6stat.ip6s_sources_deprecated[best_scope]++; 2179 } 2180 2181 return (ifa_best); 2182 } 2183 2184 /* 2185 * return the best address out of the same scope. if no address was 2186 * found, return the first valid address from designated IF. 2187 */ 2188 struct in6_ifaddr * 2189 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2190 { 2191 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2192 struct ifaddr *ifa; 2193 struct in6_ifaddr *besta = 0; 2194 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2195 2196 dep[0] = dep[1] = NULL; 2197 2198 /* 2199 * We first look for addresses in the same scope. 2200 * If there is one, return it. 2201 * If two or more, return one which matches the dst longest. 2202 * If none, return one of global addresses assigned other ifs. 2203 */ 2204 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 2205 { 2206 if (ifa->ifa_addr->sa_family != AF_INET6) 2207 continue; 2208 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2209 continue; /* XXX: is there any case to allow anycast? */ 2210 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2211 continue; /* don't use this interface */ 2212 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2213 continue; 2214 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2215 if (ip6_use_deprecated) 2216 dep[0] = (struct in6_ifaddr *)ifa; 2217 continue; 2218 } 2219 2220 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2221 /* 2222 * call in6_matchlen() as few as possible 2223 */ 2224 if (besta) { 2225 if (blen == -1) 2226 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2227 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2228 if (tlen > blen) { 2229 blen = tlen; 2230 besta = (struct in6_ifaddr *)ifa; 2231 } 2232 } else 2233 besta = (struct in6_ifaddr *)ifa; 2234 } 2235 } 2236 if (besta) 2237 return (besta); 2238 2239 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 2240 { 2241 if (ifa->ifa_addr->sa_family != AF_INET6) 2242 continue; 2243 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2244 continue; /* XXX: is there any case to allow anycast? */ 2245 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2246 continue; /* don't use this interface */ 2247 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2248 continue; 2249 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2250 if (ip6_use_deprecated) 2251 dep[1] = (struct in6_ifaddr *)ifa; 2252 continue; 2253 } 2254 2255 return (struct in6_ifaddr *)ifa; 2256 } 2257 2258 /* use the last-resort values, that are, deprecated addresses */ 2259 if (dep[0]) 2260 return dep[0]; 2261 if (dep[1]) 2262 return dep[1]; 2263 2264 return NULL; 2265 } 2266 2267 /* 2268 * perform DAD when interface becomes IFF_UP. 2269 */ 2270 void 2271 in6_if_up(struct ifnet *ifp) 2272 { 2273 struct ifaddr *ifa; 2274 struct in6_ifaddr *ia; 2275 int dad_delay; /* delay ticks before DAD output */ 2276 2277 /* 2278 * special cases, like 6to4, are handled in in6_ifattach 2279 */ 2280 in6_ifattach(ifp, NULL); 2281 2282 dad_delay = 0; 2283 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 2284 { 2285 if (ifa->ifa_addr->sa_family != AF_INET6) 2286 continue; 2287 ia = (struct in6_ifaddr *)ifa; 2288 if (ia->ia6_flags & IN6_IFF_TENTATIVE) 2289 nd6_dad_start(ifa, &dad_delay); 2290 } 2291 } 2292 2293 int 2294 in6if_do_dad(struct ifnet *ifp) 2295 { 2296 if (ifp->if_flags & IFF_LOOPBACK) 2297 return (0); 2298 2299 switch (ifp->if_type) { 2300 #ifdef IFT_DUMMY 2301 case IFT_DUMMY: 2302 #endif 2303 case IFT_FAITH: 2304 /* 2305 * These interfaces do not have the IFF_LOOPBACK flag, 2306 * but loop packets back. We do not have to do DAD on such 2307 * interfaces. We should even omit it, because loop-backed 2308 * NS would confuse the DAD procedure. 2309 */ 2310 return (0); 2311 default: 2312 /* 2313 * Our DAD routine requires the interface up and running. 2314 * However, some interfaces can be up before the RUNNING 2315 * status. Additionaly, users may try to assign addresses 2316 * before the interface becomes up (or running). 2317 * We simply skip DAD in such a case as a work around. 2318 * XXX: we should rather mark "tentative" on such addresses, 2319 * and do DAD after the interface becomes ready. 2320 */ 2321 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != 2322 (IFF_UP|IFF_RUNNING)) 2323 return (0); 2324 2325 return (1); 2326 } 2327 } 2328 2329 /* 2330 * Calculate max IPv6 MTU through all the interfaces and store it 2331 * to in6_maxmtu. 2332 */ 2333 void 2334 in6_setmaxmtu(void) 2335 { 2336 unsigned long maxmtu = 0; 2337 struct ifnet *ifp; 2338 2339 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 2340 { 2341 if (!(ifp->if_flags & IFF_LOOPBACK) && 2342 ND_IFINFO(ifp)->linkmtu > maxmtu) 2343 maxmtu = ND_IFINFO(ifp)->linkmtu; 2344 } 2345 if (maxmtu) /* update only when maxmtu is positive */ 2346 in6_maxmtu = maxmtu; 2347 } 2348 2349 void * 2350 in6_domifattach(struct ifnet *ifp) 2351 { 2352 struct in6_ifextra *ext; 2353 2354 ext = (struct in6_ifextra *)kmalloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2355 bzero(ext, sizeof(*ext)); 2356 2357 ext->in6_ifstat = (struct in6_ifstat *)kmalloc(sizeof(struct in6_ifstat), 2358 M_IFADDR, M_WAITOK); 2359 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat)); 2360 2361 ext->icmp6_ifstat = 2362 (struct icmp6_ifstat *)kmalloc(sizeof(struct icmp6_ifstat), 2363 M_IFADDR, M_WAITOK); 2364 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat)); 2365 2366 ext->nd_ifinfo = nd6_ifattach(ifp); 2367 ext->scope6_id = scope6_ifattach(ifp); 2368 return ext; 2369 } 2370 2371 void 2372 in6_domifdetach(struct ifnet *ifp, void *aux) 2373 { 2374 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2375 scope6_ifdetach(ext->scope6_id); 2376 nd6_ifdetach(ext->nd_ifinfo); 2377 kfree(ext->in6_ifstat, M_IFADDR); 2378 kfree(ext->icmp6_ifstat, M_IFADDR); 2379 kfree(ext, M_IFADDR); 2380 } 2381 2382 /* 2383 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2384 * v4 mapped addr or v4 compat addr 2385 */ 2386 void 2387 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2388 { 2389 bzero(sin, sizeof(*sin)); 2390 sin->sin_len = sizeof(struct sockaddr_in); 2391 sin->sin_family = AF_INET; 2392 sin->sin_port = sin6->sin6_port; 2393 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2394 } 2395 2396 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2397 void 2398 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2399 { 2400 bzero(sin6, sizeof(*sin6)); 2401 sin6->sin6_len = sizeof(struct sockaddr_in6); 2402 sin6->sin6_family = AF_INET6; 2403 sin6->sin6_port = sin->sin_port; 2404 sin6->sin6_addr.s6_addr32[0] = 0; 2405 sin6->sin6_addr.s6_addr32[1] = 0; 2406 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2407 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2408 } 2409 2410 /* Convert sockaddr_in6 into sockaddr_in. */ 2411 void 2412 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2413 { 2414 struct sockaddr_in *sin_p; 2415 struct sockaddr_in6 sin6; 2416 2417 /* 2418 * Save original sockaddr_in6 addr and convert it 2419 * to sockaddr_in. 2420 */ 2421 sin6 = *(struct sockaddr_in6 *)nam; 2422 sin_p = (struct sockaddr_in *)nam; 2423 in6_sin6_2_sin(sin_p, &sin6); 2424 } 2425 2426 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2427 void 2428 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2429 { 2430 struct sockaddr_in *sin_p; 2431 struct sockaddr_in6 *sin6_p; 2432 2433 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 2434 M_WAITOK); 2435 sin_p = (struct sockaddr_in *)*nam; 2436 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2437 FREE(*nam, M_SONAME); 2438 *nam = (struct sockaddr *)sin6_p; 2439 } 2440