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 1.6 2003/08/23 11:02:45 rob 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 84 #include <net/if.h> 85 #include <net/if_types.h> 86 #include <net/route.h> 87 #include <net/if_dl.h> 88 89 #include <netinet/in.h> 90 #include <netinet/in_var.h> 91 #include <netinet/if_ether.h> 92 #ifndef SCOPEDROUTING 93 #include <netinet/in_systm.h> 94 #include <netinet/ip.h> 95 #include <netinet/in_pcb.h> 96 #endif 97 98 #include <netinet/ip6.h> 99 #include <netinet6/ip6_var.h> 100 #include <netinet6/nd6.h> 101 #include <netinet6/mld6_var.h> 102 #include <netinet6/ip6_mroute.h> 103 #include <netinet6/in6_ifattach.h> 104 #include <netinet6/scope6_var.h> 105 #ifndef SCOPEDROUTING 106 #include <netinet6/in6_pcb.h> 107 #endif 108 109 #include <net/net_osdep.h> 110 111 MALLOC_DEFINE(M_IPMADDR, "in6_multi", "internet multicast address"); 112 113 /* 114 * Definitions of some costant IP6 addresses. 115 */ 116 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 117 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 118 const struct in6_addr in6addr_nodelocal_allnodes = 119 IN6ADDR_NODELOCAL_ALLNODES_INIT; 120 const struct in6_addr in6addr_linklocal_allnodes = 121 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 122 const struct in6_addr in6addr_linklocal_allrouters = 123 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 124 125 const struct in6_addr in6mask0 = IN6MASK0; 126 const struct in6_addr in6mask32 = IN6MASK32; 127 const struct in6_addr in6mask64 = IN6MASK64; 128 const struct in6_addr in6mask96 = IN6MASK96; 129 const struct in6_addr in6mask128 = IN6MASK128; 130 131 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6, 132 0, 0, IN6ADDR_ANY_INIT, 0}; 133 134 static int in6_lifaddr_ioctl (struct socket *, u_long, caddr_t, 135 struct ifnet *, struct thread *); 136 static int in6_ifinit (struct ifnet *, struct in6_ifaddr *, 137 struct sockaddr_in6 *, int); 138 static void in6_unlink_ifa (struct in6_ifaddr *, struct ifnet *); 139 140 struct in6_multihead in6_multihead; /* XXX BSS initialization */ 141 142 int (*faithprefix_p)(struct in6_addr *); 143 144 /* 145 * Subroutine for in6_ifaddloop() and in6_ifremloop(). 146 * This routine does actual work. 147 */ 148 static void 149 in6_ifloop_request(int cmd, struct ifaddr *ifa) 150 { 151 struct sockaddr_in6 all1_sa; 152 struct rtentry *nrt = NULL; 153 int e; 154 155 bzero(&all1_sa, sizeof(all1_sa)); 156 all1_sa.sin6_family = AF_INET6; 157 all1_sa.sin6_len = sizeof(struct sockaddr_in6); 158 all1_sa.sin6_addr = in6mask128; 159 160 /* 161 * We specify the address itself as the gateway, and set the 162 * RTF_LLINFO flag, so that the corresponding host route would have 163 * the flag, and thus applications that assume traditional behavior 164 * would be happy. Note that we assume the caller of the function 165 * (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest, 166 * which changes the outgoing interface to the loopback interface. 167 */ 168 e = rtrequest(cmd, ifa->ifa_addr, ifa->ifa_addr, 169 (struct sockaddr *)&all1_sa, 170 RTF_UP|RTF_HOST|RTF_LLINFO, &nrt); 171 if (e != 0) { 172 log(LOG_ERR, "in6_ifloop_request: " 173 "%s operation failed for %s (errno=%d)\n", 174 cmd == RTM_ADD ? "ADD" : "DELETE", 175 ip6_sprintf(&((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr), 176 e); 177 } 178 179 /* 180 * Make sure rt_ifa be equal to IFA, the second argument of the 181 * function. 182 * We need this because when we refer to rt_ifa->ia6_flags in 183 * ip6_input, we assume that the rt_ifa points to the address instead 184 * of the loopback address. 185 */ 186 if (cmd == RTM_ADD && nrt && ifa != nrt->rt_ifa) { 187 IFAFREE(nrt->rt_ifa); 188 IFAREF(ifa); 189 nrt->rt_ifa = ifa; 190 } 191 192 /* 193 * Report the addition/removal of the address to the routing socket. 194 * XXX: since we called rtinit for a p2p interface with a destination, 195 * we end up reporting twice in such a case. Should we rather 196 * omit the second report? 197 */ 198 if (nrt) { 199 rt_newaddrmsg(cmd, ifa, e, nrt); 200 if (cmd == RTM_DELETE) { 201 if (nrt->rt_refcnt <= 0) { 202 /* XXX: we should free the entry ourselves. */ 203 nrt->rt_refcnt++; 204 rtfree(nrt); 205 } 206 } else { 207 /* the cmd must be RTM_ADD here */ 208 nrt->rt_refcnt--; 209 } 210 } 211 } 212 213 /* 214 * Add ownaddr as loopback rtentry. We previously add the route only if 215 * necessary (ex. on a p2p link). However, since we now manage addresses 216 * separately from prefixes, we should always add the route. We can't 217 * rely on the cloning mechanism from the corresponding interface route 218 * any more. 219 */ 220 static void 221 in6_ifaddloop(struct ifaddr *ifa) 222 { 223 struct rtentry *rt; 224 225 /* If there is no loopback entry, allocate one. */ 226 rt = rtalloc1(ifa->ifa_addr, 0, 0); 227 if (rt == NULL || (rt->rt_flags & RTF_HOST) == 0 || 228 (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) 229 in6_ifloop_request(RTM_ADD, ifa); 230 if (rt) 231 rt->rt_refcnt--; 232 } 233 234 /* 235 * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(), 236 * if it exists. 237 */ 238 static void 239 in6_ifremloop(struct ifaddr *ifa) 240 { 241 struct in6_ifaddr *ia; 242 struct rtentry *rt; 243 int ia_count = 0; 244 245 /* 246 * Some of BSD variants do not remove cloned routes 247 * from an interface direct route, when removing the direct route 248 * (see comments in net/net_osdep.h). Even for variants that do remove 249 * cloned routes, they could fail to remove the cloned routes when 250 * we handle multple addresses that share a common prefix. 251 * So, we should remove the route corresponding to the deleted address 252 * regardless of the result of in6_is_ifloop_auto(). 253 */ 254 255 /* 256 * Delete the entry only if exact one ifa exists. More than one ifa 257 * can exist if we assign a same single address to multiple 258 * (probably p2p) interfaces. 259 * XXX: we should avoid such a configuration in IPv6... 260 */ 261 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 262 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) { 263 ia_count++; 264 if (ia_count > 1) 265 break; 266 } 267 } 268 269 if (ia_count == 1) { 270 /* 271 * Before deleting, check if a corresponding loopbacked host 272 * route surely exists. With this check, we can avoid to 273 * delete an interface direct route whose destination is same 274 * as the address being removed. This can happen when remofing 275 * a subnet-router anycast address on an interface attahced 276 * to a shared medium. 277 */ 278 rt = rtalloc1(ifa->ifa_addr, 0, 0); 279 if (rt != NULL && (rt->rt_flags & RTF_HOST) != 0 && 280 (rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) { 281 rt->rt_refcnt--; 282 in6_ifloop_request(RTM_DELETE, ifa); 283 } 284 } 285 } 286 287 int 288 in6_ifindex2scopeid(idx) 289 int idx; 290 { 291 struct ifnet *ifp; 292 struct ifaddr *ifa; 293 struct sockaddr_in6 *sin6; 294 295 if (idx < 0 || if_index < idx) 296 return -1; 297 ifp = ifindex2ifnet[idx]; 298 299 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 300 { 301 if (ifa->ifa_addr->sa_family != AF_INET6) 302 continue; 303 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 304 if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) 305 return sin6->sin6_scope_id & 0xffff; 306 } 307 308 return -1; 309 } 310 311 int 312 in6_mask2len(mask, lim0) 313 struct in6_addr *mask; 314 u_char *lim0; 315 { 316 int x = 0, y; 317 u_char *lim = lim0, *p; 318 319 if (lim0 == NULL || 320 lim0 - (u_char *)mask > sizeof(*mask)) /* ignore the scope_id part */ 321 lim = (u_char *)mask + sizeof(*mask); 322 for (p = (u_char *)mask; p < lim; x++, p++) { 323 if (*p != 0xff) 324 break; 325 } 326 y = 0; 327 if (p < lim) { 328 for (y = 0; y < 8; y++) { 329 if ((*p & (0x80 >> y)) == 0) 330 break; 331 } 332 } 333 334 /* 335 * when the limit pointer is given, do a stricter check on the 336 * remaining bits. 337 */ 338 if (p < lim) { 339 if (y != 0 && (*p & (0x00ff >> y)) != 0) 340 return(-1); 341 for (p = p + 1; p < lim; p++) 342 if (*p != 0) 343 return(-1); 344 } 345 346 return x * 8 + y; 347 } 348 349 void 350 in6_len2mask(mask, len) 351 struct in6_addr *mask; 352 int len; 353 { 354 int i; 355 356 bzero(mask, sizeof(*mask)); 357 for (i = 0; i < len / 8; i++) 358 mask->s6_addr8[i] = 0xff; 359 if (len % 8) 360 mask->s6_addr8[i] = (0xff00 >> (len % 8)) & 0xff; 361 } 362 363 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 364 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 365 366 int 367 in6_control(struct socket *so, u_long cmd, caddr_t data, 368 struct ifnet *ifp, struct thread *td) 369 { 370 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 371 struct in6_ifaddr *ia = NULL; 372 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 373 int privileged; 374 375 privileged = 0; 376 if (suser(td) == 0) 377 privileged++; 378 379 switch (cmd) { 380 case SIOCGETSGCNT_IN6: 381 case SIOCGETMIFCNT_IN6: 382 return (mrt6_ioctl(cmd, data)); 383 } 384 385 if (ifp == NULL) 386 return(EOPNOTSUPP); 387 388 switch (cmd) { 389 case SIOCSNDFLUSH_IN6: 390 case SIOCSPFXFLUSH_IN6: 391 case SIOCSRTRFLUSH_IN6: 392 case SIOCSDEFIFACE_IN6: 393 case SIOCSIFINFO_FLAGS: 394 if (!privileged) 395 return(EPERM); 396 /* fall through */ 397 case OSIOCGIFINFO_IN6: 398 case SIOCGIFINFO_IN6: 399 case SIOCGDRLST_IN6: 400 case SIOCGPRLST_IN6: 401 case SIOCGNBRINFO_IN6: 402 case SIOCGDEFIFACE_IN6: 403 return(nd6_ioctl(cmd, data, ifp)); 404 } 405 406 switch (cmd) { 407 case SIOCSIFPREFIX_IN6: 408 case SIOCDIFPREFIX_IN6: 409 case SIOCAIFPREFIX_IN6: 410 case SIOCCIFPREFIX_IN6: 411 case SIOCSGIFPREFIX_IN6: 412 case SIOCGIFPREFIX_IN6: 413 log(LOG_NOTICE, 414 "prefix ioctls are now invalidated. " 415 "please use ifconfig.\n"); 416 return(EOPNOTSUPP); 417 } 418 419 switch (cmd) { 420 case SIOCSSCOPE6: 421 if (!privileged) 422 return(EPERM); 423 return(scope6_set(ifp, ifr->ifr_ifru.ifru_scope_id)); 424 break; 425 case SIOCGSCOPE6: 426 return(scope6_get(ifp, ifr->ifr_ifru.ifru_scope_id)); 427 break; 428 case SIOCGSCOPE6DEF: 429 return(scope6_get_default(ifr->ifr_ifru.ifru_scope_id)); 430 break; 431 } 432 433 switch (cmd) { 434 case SIOCALIFADDR: 435 case SIOCDLIFADDR: 436 if (!privileged) 437 return(EPERM); 438 /* fall through */ 439 case SIOCGLIFADDR: 440 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 441 } 442 443 /* 444 * Find address for this interface, if it exists. 445 */ 446 if (ifra->ifra_addr.sin6_family == AF_INET6) { /* XXX */ 447 struct sockaddr_in6 *sa6 = 448 (struct sockaddr_in6 *)&ifra->ifra_addr; 449 450 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) { 451 if (sa6->sin6_addr.s6_addr16[1] == 0) { 452 /* link ID is not embedded by the user */ 453 sa6->sin6_addr.s6_addr16[1] = 454 htons(ifp->if_index); 455 } else if (sa6->sin6_addr.s6_addr16[1] != 456 htons(ifp->if_index)) { 457 return(EINVAL); /* link ID contradicts */ 458 } 459 if (sa6->sin6_scope_id) { 460 if (sa6->sin6_scope_id != 461 (u_int32_t)ifp->if_index) 462 return(EINVAL); 463 sa6->sin6_scope_id = 0; /* XXX: good way? */ 464 } 465 } 466 ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr); 467 } 468 469 switch (cmd) { 470 case SIOCSIFADDR_IN6: 471 case SIOCSIFDSTADDR_IN6: 472 case SIOCSIFNETMASK_IN6: 473 /* 474 * Since IPv6 allows a node to assign multiple addresses 475 * on a single interface, SIOCSIFxxx ioctls are not suitable 476 * and should be unused. 477 */ 478 /* we decided to obsolete this command (20000704) */ 479 return(EINVAL); 480 481 case SIOCDIFADDR_IN6: 482 /* 483 * for IPv4, we look for existing in_ifaddr here to allow 484 * "ifconfig if0 delete" to remove first IPv4 address on the 485 * interface. For IPv6, as the spec allow multiple interface 486 * address from the day one, we consider "remove the first one" 487 * semantics to be not preferable. 488 */ 489 if (ia == NULL) 490 return(EADDRNOTAVAIL); 491 /* FALLTHROUGH */ 492 case SIOCAIFADDR_IN6: 493 /* 494 * We always require users to specify a valid IPv6 address for 495 * the corresponding operation. 496 */ 497 if (ifra->ifra_addr.sin6_family != AF_INET6 || 498 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) 499 return(EAFNOSUPPORT); 500 if (!privileged) 501 return(EPERM); 502 503 break; 504 505 case SIOCGIFADDR_IN6: 506 /* This interface is basically deprecated. use SIOCGIFCONF. */ 507 /* fall through */ 508 case SIOCGIFAFLAG_IN6: 509 case SIOCGIFNETMASK_IN6: 510 case SIOCGIFDSTADDR_IN6: 511 case SIOCGIFALIFETIME_IN6: 512 /* must think again about its semantics */ 513 if (ia == NULL) 514 return(EADDRNOTAVAIL); 515 break; 516 case SIOCSIFALIFETIME_IN6: 517 { 518 struct in6_addrlifetime *lt; 519 520 if (!privileged) 521 return(EPERM); 522 if (ia == NULL) 523 return(EADDRNOTAVAIL); 524 /* sanity for overflow - beware unsigned */ 525 lt = &ifr->ifr_ifru.ifru_lifetime; 526 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME 527 && lt->ia6t_vltime + time_second < time_second) { 528 return EINVAL; 529 } 530 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME 531 && lt->ia6t_pltime + time_second < time_second) { 532 return EINVAL; 533 } 534 break; 535 } 536 } 537 538 switch (cmd) { 539 540 case SIOCGIFADDR_IN6: 541 ifr->ifr_addr = ia->ia_addr; 542 break; 543 544 case SIOCGIFDSTADDR_IN6: 545 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 546 return(EINVAL); 547 /* 548 * XXX: should we check if ifa_dstaddr is NULL and return 549 * an error? 550 */ 551 ifr->ifr_dstaddr = ia->ia_dstaddr; 552 break; 553 554 case SIOCGIFNETMASK_IN6: 555 ifr->ifr_addr = ia->ia_prefixmask; 556 break; 557 558 case SIOCGIFAFLAG_IN6: 559 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 560 break; 561 562 case SIOCGIFSTAT_IN6: 563 if (ifp == NULL) 564 return EINVAL; 565 if (in6_ifstat == NULL || ifp->if_index >= in6_ifstatmax 566 || in6_ifstat[ifp->if_index] == NULL) { 567 /* return EAFNOSUPPORT? */ 568 bzero(&ifr->ifr_ifru.ifru_stat, 569 sizeof(ifr->ifr_ifru.ifru_stat)); 570 } else 571 ifr->ifr_ifru.ifru_stat = *in6_ifstat[ifp->if_index]; 572 break; 573 574 case SIOCGIFSTAT_ICMP6: 575 if (ifp == NULL) 576 return EINVAL; 577 if (icmp6_ifstat == NULL || ifp->if_index >= icmp6_ifstatmax || 578 icmp6_ifstat[ifp->if_index] == NULL) { 579 /* return EAFNOSUPPORT? */ 580 bzero(&ifr->ifr_ifru.ifru_stat, 581 sizeof(ifr->ifr_ifru.ifru_icmp6stat)); 582 } else 583 ifr->ifr_ifru.ifru_icmp6stat = 584 *icmp6_ifstat[ifp->if_index]; 585 break; 586 587 case SIOCGIFALIFETIME_IN6: 588 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 589 break; 590 591 case SIOCSIFALIFETIME_IN6: 592 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; 593 /* for sanity */ 594 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 595 ia->ia6_lifetime.ia6t_expire = 596 time_second + ia->ia6_lifetime.ia6t_vltime; 597 } else 598 ia->ia6_lifetime.ia6t_expire = 0; 599 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 600 ia->ia6_lifetime.ia6t_preferred = 601 time_second + ia->ia6_lifetime.ia6t_pltime; 602 } else 603 ia->ia6_lifetime.ia6t_preferred = 0; 604 break; 605 606 case SIOCAIFADDR_IN6: 607 { 608 int i, error = 0; 609 struct nd_prefix pr0, *pr; 610 611 /* 612 * first, make or update the interface address structure, 613 * and link it to the list. 614 */ 615 if ((error = in6_update_ifa(ifp, ifra, ia)) != 0) 616 return(error); 617 618 /* 619 * then, make the prefix on-link on the interface. 620 * XXX: we'd rather create the prefix before the address, but 621 * we need at least one address to install the corresponding 622 * interface route, so we configure the address first. 623 */ 624 625 /* 626 * convert mask to prefix length (prefixmask has already 627 * been validated in in6_update_ifa(). 628 */ 629 bzero(&pr0, sizeof(pr0)); 630 pr0.ndpr_ifp = ifp; 631 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 632 NULL); 633 if (pr0.ndpr_plen == 128) 634 break; /* we don't need to install a host route. */ 635 pr0.ndpr_prefix = ifra->ifra_addr; 636 pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr; 637 /* apply the mask for safety. */ 638 for (i = 0; i < 4; i++) { 639 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 640 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i]; 641 } 642 /* 643 * XXX: since we don't have an API to set prefix (not address) 644 * lifetimes, we just use the same lifetimes as addresses. 645 * The (temporarily) installed lifetimes can be overridden by 646 * later advertised RAs (when accept_rtadv is non 0), which is 647 * an intended behavior. 648 */ 649 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 650 pr0.ndpr_raf_auto = 651 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 652 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 653 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 654 655 /* add the prefix if there's one. */ 656 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 657 /* 658 * nd6_prelist_add will install the corresponding 659 * interface route. 660 */ 661 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) 662 return(error); 663 if (pr == NULL) { 664 log(LOG_ERR, "nd6_prelist_add succedded but " 665 "no prefix\n"); 666 return(EINVAL); /* XXX panic here? */ 667 } 668 } 669 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 670 == NULL) { 671 /* XXX: this should not happen! */ 672 log(LOG_ERR, "in6_control: addition succeeded, but" 673 " no ifaddr\n"); 674 } else { 675 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) != 0 && 676 ia->ia6_ndpr == NULL) { /* new autoconfed addr */ 677 ia->ia6_ndpr = pr; 678 pr->ndpr_refcnt++; 679 680 /* 681 * If this is the first autoconf address from 682 * the prefix, create a temporary address 683 * as well (when specified). 684 */ 685 if (ip6_use_tempaddr && 686 pr->ndpr_refcnt == 1) { 687 int e; 688 if ((e = in6_tmpifadd(ia, 1)) != 0) { 689 log(LOG_NOTICE, "in6_control: " 690 "failed to create a " 691 "temporary address, " 692 "errno=%d\n", 693 e); 694 } 695 } 696 } 697 698 /* 699 * this might affect the status of autoconfigured 700 * addresses, that is, this address might make 701 * other addresses detached. 702 */ 703 pfxlist_onlink_check(); 704 } 705 break; 706 } 707 708 case SIOCDIFADDR_IN6: 709 { 710 int i = 0; 711 struct nd_prefix pr0, *pr; 712 713 /* 714 * If the address being deleted is the only one that owns 715 * the corresponding prefix, expire the prefix as well. 716 * XXX: theoretically, we don't have to warry about such 717 * relationship, since we separate the address management 718 * and the prefix management. We do this, however, to provide 719 * as much backward compatibility as possible in terms of 720 * the ioctl operation. 721 */ 722 bzero(&pr0, sizeof(pr0)); 723 pr0.ndpr_ifp = ifp; 724 pr0.ndpr_plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, 725 NULL); 726 if (pr0.ndpr_plen == 128) 727 goto purgeaddr; 728 pr0.ndpr_prefix = ia->ia_addr; 729 pr0.ndpr_mask = ia->ia_prefixmask.sin6_addr; 730 for (i = 0; i < 4; i++) { 731 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 732 ia->ia_prefixmask.sin6_addr.s6_addr32[i]; 733 } 734 /* 735 * The logic of the following condition is a bit complicated. 736 * We expire the prefix when 737 * 1. the address obeys autoconfiguration and it is the 738 * only owner of the associated prefix, or 739 * 2. the address does not obey autoconf and there is no 740 * other owner of the prefix. 741 */ 742 if ((pr = nd6_prefix_lookup(&pr0)) != NULL && 743 (((ia->ia6_flags & IN6_IFF_AUTOCONF) != 0 && 744 pr->ndpr_refcnt == 1) || 745 ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0 && 746 pr->ndpr_refcnt == 0))) { 747 pr->ndpr_expire = 1; /* XXX: just for expiration */ 748 } 749 750 purgeaddr: 751 in6_purgeaddr(&ia->ia_ifa); 752 break; 753 } 754 755 default: 756 if (ifp == NULL || ifp->if_ioctl == 0) 757 return(EOPNOTSUPP); 758 return((*ifp->if_ioctl)(ifp, cmd, data)); 759 } 760 761 return(0); 762 } 763 764 /* 765 * Update parameters of an IPv6 interface address. 766 * If necessary, a new entry is created and linked into address chains. 767 * This function is separated from in6_control(). 768 * XXX: should this be performed under splnet()? 769 */ 770 int 771 in6_update_ifa(ifp, ifra, ia) 772 struct ifnet *ifp; 773 struct in6_aliasreq *ifra; 774 struct in6_ifaddr *ia; 775 { 776 int error = 0, hostIsNew = 0, plen = -1; 777 struct in6_ifaddr *oia; 778 struct sockaddr_in6 dst6; 779 struct in6_addrlifetime *lt; 780 781 /* Validate parameters */ 782 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 783 return(EINVAL); 784 785 /* 786 * The destination address for a p2p link must have a family 787 * of AF_UNSPEC or AF_INET6. 788 */ 789 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 790 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 791 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 792 return(EAFNOSUPPORT); 793 /* 794 * validate ifra_prefixmask. don't check sin6_family, netmask 795 * does not carry fields other than sin6_len. 796 */ 797 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 798 return(EINVAL); 799 /* 800 * Because the IPv6 address architecture is classless, we require 801 * users to specify a (non 0) prefix length (mask) for a new address. 802 * We also require the prefix (when specified) mask is valid, and thus 803 * reject a non-consecutive mask. 804 */ 805 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 806 return(EINVAL); 807 if (ifra->ifra_prefixmask.sin6_len != 0) { 808 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 809 (u_char *)&ifra->ifra_prefixmask + 810 ifra->ifra_prefixmask.sin6_len); 811 if (plen <= 0) 812 return(EINVAL); 813 } 814 else { 815 /* 816 * In this case, ia must not be NULL. We just use its prefix 817 * length. 818 */ 819 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 820 } 821 /* 822 * If the destination address on a p2p interface is specified, 823 * and the address is a scoped one, validate/set the scope 824 * zone identifier. 825 */ 826 dst6 = ifra->ifra_dstaddr; 827 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) && 828 (dst6.sin6_family == AF_INET6)) { 829 int scopeid; 830 831 #ifndef SCOPEDROUTING 832 if ((error = in6_recoverscope(&dst6, 833 &ifra->ifra_dstaddr.sin6_addr, 834 ifp)) != 0) 835 return(error); 836 #endif 837 scopeid = in6_addr2scopeid(ifp, &dst6.sin6_addr); 838 if (dst6.sin6_scope_id == 0) /* user omit to specify the ID. */ 839 dst6.sin6_scope_id = scopeid; 840 else if (dst6.sin6_scope_id != scopeid) 841 return(EINVAL); /* scope ID mismatch. */ 842 #ifndef SCOPEDROUTING 843 if ((error = in6_embedscope(&dst6.sin6_addr, &dst6, NULL, NULL)) 844 != 0) 845 return(error); 846 dst6.sin6_scope_id = 0; /* XXX */ 847 #endif 848 } 849 /* 850 * The destination address can be specified only for a p2p or a 851 * loopback interface. If specified, the corresponding prefix length 852 * must be 128. 853 */ 854 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 855 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 856 /* XXX: noisy message */ 857 log(LOG_INFO, "in6_update_ifa: a destination can be " 858 "specified for a p2p or a loopback IF only\n"); 859 return(EINVAL); 860 } 861 if (plen != 128) { 862 /* 863 * The following message seems noisy, but we dare to 864 * add it for diagnosis. 865 */ 866 log(LOG_INFO, "in6_update_ifa: prefixlen must be 128 " 867 "when dstaddr is specified\n"); 868 return(EINVAL); 869 } 870 } 871 /* lifetime consistency check */ 872 lt = &ifra->ifra_lifetime; 873 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME 874 && lt->ia6t_vltime + time_second < time_second) { 875 return EINVAL; 876 } 877 if (lt->ia6t_vltime == 0) { 878 /* 879 * the following log might be noisy, but this is a typical 880 * configuration mistake or a tool's bug. 881 */ 882 log(LOG_INFO, 883 "in6_update_ifa: valid lifetime is 0 for %s\n", 884 ip6_sprintf(&ifra->ifra_addr.sin6_addr)); 885 } 886 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME 887 && lt->ia6t_pltime + time_second < time_second) { 888 return EINVAL; 889 } 890 891 /* 892 * If this is a new address, allocate a new ifaddr and link it 893 * into chains. 894 */ 895 if (ia == NULL) { 896 hostIsNew = 1; 897 /* 898 * When in6_update_ifa() is called in a process of a received 899 * RA, it is called under splnet(). So, we should call malloc 900 * with M_NOWAIT. 901 */ 902 ia = (struct in6_ifaddr *) 903 malloc(sizeof(*ia), M_IFADDR, M_NOWAIT); 904 if (ia == NULL) 905 return (ENOBUFS); 906 bzero((caddr_t)ia, sizeof(*ia)); 907 /* Initialize the address and masks */ 908 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 909 ia->ia_addr.sin6_family = AF_INET6; 910 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 911 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 912 /* 913 * XXX: some functions expect that ifa_dstaddr is not 914 * NULL for p2p interfaces. 915 */ 916 ia->ia_ifa.ifa_dstaddr 917 = (struct sockaddr *)&ia->ia_dstaddr; 918 } else { 919 ia->ia_ifa.ifa_dstaddr = NULL; 920 } 921 ia->ia_ifa.ifa_netmask 922 = (struct sockaddr *)&ia->ia_prefixmask; 923 924 ia->ia_ifp = ifp; 925 if ((oia = in6_ifaddr) != NULL) { 926 for ( ; oia->ia_next; oia = oia->ia_next) 927 continue; 928 oia->ia_next = ia; 929 } else 930 in6_ifaddr = ia; 931 932 TAILQ_INSERT_TAIL(&ifp->if_addrlist, &ia->ia_ifa, 933 ifa_list); 934 } 935 936 /* set prefix mask */ 937 if (ifra->ifra_prefixmask.sin6_len) { 938 /* 939 * We prohibit changing the prefix length of an existing 940 * address, because 941 * + such an operation should be rare in IPv6, and 942 * + the operation would confuse prefix management. 943 */ 944 if (ia->ia_prefixmask.sin6_len && 945 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 946 log(LOG_INFO, "in6_update_ifa: the prefix length of an" 947 " existing (%s) address should not be changed\n", 948 ip6_sprintf(&ia->ia_addr.sin6_addr)); 949 error = EINVAL; 950 goto unlink; 951 } 952 ia->ia_prefixmask = ifra->ifra_prefixmask; 953 } 954 955 /* 956 * If a new destination address is specified, scrub the old one and 957 * install the new destination. Note that the interface must be 958 * p2p or loopback (see the check above.) 959 */ 960 if (dst6.sin6_family == AF_INET6 && 961 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, 962 &ia->ia_dstaddr.sin6_addr)) { 963 int e; 964 965 if ((ia->ia_flags & IFA_ROUTE) != 0 && 966 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 967 != 0) { 968 log(LOG_ERR, "in6_update_ifa: failed to remove " 969 "a route to the old destination: %s\n", 970 ip6_sprintf(&ia->ia_addr.sin6_addr)); 971 /* proceed anyway... */ 972 } 973 else 974 ia->ia_flags &= ~IFA_ROUTE; 975 ia->ia_dstaddr = dst6; 976 } 977 978 /* reset the interface and routing table appropriately. */ 979 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 980 goto unlink; 981 982 /* 983 * Beyond this point, we should call in6_purgeaddr upon an error, 984 * not just go to unlink. 985 */ 986 987 #if 0 /* disable this mechanism for now */ 988 /* update prefix list */ 989 if (hostIsNew && 990 (ifra->ifra_flags & IN6_IFF_NOPFX) == 0) { /* XXX */ 991 int iilen; 992 993 iilen = (sizeof(ia->ia_prefixmask.sin6_addr) << 3) - plen; 994 if ((error = in6_prefix_add_ifid(iilen, ia)) != 0) { 995 in6_purgeaddr((struct ifaddr *)ia); 996 return(error); 997 } 998 } 999 #endif 1000 1001 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1002 struct sockaddr_in6 mltaddr, mltmask; 1003 struct in6_multi *in6m; 1004 1005 if (hostIsNew) { 1006 /* 1007 * join solicited multicast addr for new host id 1008 */ 1009 struct in6_addr llsol; 1010 bzero(&llsol, sizeof(struct in6_addr)); 1011 llsol.s6_addr16[0] = htons(0xff02); 1012 llsol.s6_addr16[1] = htons(ifp->if_index); 1013 llsol.s6_addr32[1] = 0; 1014 llsol.s6_addr32[2] = htonl(1); 1015 llsol.s6_addr32[3] = 1016 ifra->ifra_addr.sin6_addr.s6_addr32[3]; 1017 llsol.s6_addr8[12] = 0xff; 1018 (void)in6_addmulti(&llsol, ifp, &error); 1019 if (error != 0) { 1020 log(LOG_WARNING, 1021 "in6_update_ifa: addmulti failed for " 1022 "%s on %s (errno=%d)\n", 1023 ip6_sprintf(&llsol), if_name(ifp), 1024 error); 1025 in6_purgeaddr((struct ifaddr *)ia); 1026 return(error); 1027 } 1028 } 1029 1030 bzero(&mltmask, sizeof(mltmask)); 1031 mltmask.sin6_len = sizeof(struct sockaddr_in6); 1032 mltmask.sin6_family = AF_INET6; 1033 mltmask.sin6_addr = in6mask32; 1034 1035 /* 1036 * join link-local all-nodes address 1037 */ 1038 bzero(&mltaddr, sizeof(mltaddr)); 1039 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 1040 mltaddr.sin6_family = AF_INET6; 1041 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 1042 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1043 1044 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1045 if (in6m == NULL) { 1046 rtrequest(RTM_ADD, 1047 (struct sockaddr *)&mltaddr, 1048 (struct sockaddr *)&ia->ia_addr, 1049 (struct sockaddr *)&mltmask, 1050 RTF_UP|RTF_CLONING, /* xxx */ 1051 (struct rtentry **)0); 1052 (void)in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 1053 if (error != 0) { 1054 log(LOG_WARNING, 1055 "in6_update_ifa: addmulti failed for " 1056 "%s on %s (errno=%d)\n", 1057 ip6_sprintf(&mltaddr.sin6_addr), 1058 if_name(ifp), error); 1059 } 1060 } 1061 1062 /* 1063 * join node information group address 1064 */ 1065 #define hostnamelen strlen(hostname) 1066 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr.sin6_addr) 1067 == 0) { 1068 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1069 if (in6m == NULL && ia != NULL) { 1070 (void)in6_addmulti(&mltaddr.sin6_addr, 1071 ifp, &error); 1072 if (error != 0) { 1073 log(LOG_WARNING, "in6_update_ifa: " 1074 "addmulti failed for " 1075 "%s on %s (errno=%d)\n", 1076 ip6_sprintf(&mltaddr.sin6_addr), 1077 if_name(ifp), error); 1078 } 1079 } 1080 } 1081 #undef hostnamelen 1082 1083 /* 1084 * join node-local all-nodes address, on loopback. 1085 * XXX: since "node-local" is obsoleted by interface-local, 1086 * we have to join the group on every interface with 1087 * some interface-boundary restriction. 1088 */ 1089 if (ifp->if_flags & IFF_LOOPBACK) { 1090 struct in6_ifaddr *ia_loop; 1091 1092 struct in6_addr loop6 = in6addr_loopback; 1093 ia_loop = in6ifa_ifpwithaddr(ifp, &loop6); 1094 1095 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1096 1097 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1098 if (in6m == NULL && ia_loop != NULL) { 1099 rtrequest(RTM_ADD, 1100 (struct sockaddr *)&mltaddr, 1101 (struct sockaddr *)&ia_loop->ia_addr, 1102 (struct sockaddr *)&mltmask, 1103 RTF_UP, 1104 (struct rtentry **)0); 1105 (void)in6_addmulti(&mltaddr.sin6_addr, ifp, 1106 &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 * make sure to initialize ND6 information. this is to workaround 1137 * issues with interfaces with IPv6 addresses, which have never brought 1138 * up. We are assuming that it is safe to nd6_ifattach multiple times. 1139 */ 1140 nd6_ifattach(ifp); 1141 1142 /* 1143 * Perform DAD, if needed. 1144 * XXX It may be of use, if we can administratively 1145 * disable DAD. 1146 */ 1147 if (in6if_do_dad(ifp) && (ifra->ifra_flags & IN6_IFF_NODAD) == 0) { 1148 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1149 nd6_dad_start((struct ifaddr *)ia, NULL); 1150 } 1151 1152 return(error); 1153 1154 unlink: 1155 /* 1156 * XXX: if a change of an existing address failed, keep the entry 1157 * anyway. 1158 */ 1159 if (hostIsNew) 1160 in6_unlink_ifa(ia, ifp); 1161 return(error); 1162 } 1163 1164 void 1165 in6_purgeaddr(ifa) 1166 struct ifaddr *ifa; 1167 { 1168 struct ifnet *ifp = ifa->ifa_ifp; 1169 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1170 1171 /* stop DAD processing */ 1172 nd6_dad_stop(ifa); 1173 1174 /* 1175 * delete route to the destination of the address being purged. 1176 * The interface must be p2p or loopback in this case. 1177 */ 1178 if ((ia->ia_flags & IFA_ROUTE) != 0 && ia->ia_dstaddr.sin6_len != 0) { 1179 int e; 1180 1181 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 1182 != 0) { 1183 log(LOG_ERR, "in6_purgeaddr: failed to remove " 1184 "a route to the p2p destination: %s on %s, " 1185 "errno=%d\n", 1186 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp), 1187 e); 1188 /* proceed anyway... */ 1189 } 1190 else 1191 ia->ia_flags &= ~IFA_ROUTE; 1192 } 1193 1194 /* Remove ownaddr's loopback rtentry, if it exists. */ 1195 in6_ifremloop(&(ia->ia_ifa)); 1196 1197 if (ifp->if_flags & IFF_MULTICAST) { 1198 /* 1199 * delete solicited multicast addr for deleting host id 1200 */ 1201 struct in6_multi *in6m; 1202 struct in6_addr llsol; 1203 bzero(&llsol, sizeof(struct in6_addr)); 1204 llsol.s6_addr16[0] = htons(0xff02); 1205 llsol.s6_addr16[1] = htons(ifp->if_index); 1206 llsol.s6_addr32[1] = 0; 1207 llsol.s6_addr32[2] = htonl(1); 1208 llsol.s6_addr32[3] = 1209 ia->ia_addr.sin6_addr.s6_addr32[3]; 1210 llsol.s6_addr8[12] = 0xff; 1211 1212 IN6_LOOKUP_MULTI(llsol, ifp, in6m); 1213 if (in6m) 1214 in6_delmulti(in6m); 1215 } 1216 1217 in6_unlink_ifa(ia, ifp); 1218 } 1219 1220 static void 1221 in6_unlink_ifa(ia, ifp) 1222 struct in6_ifaddr *ia; 1223 struct ifnet *ifp; 1224 { 1225 int plen, iilen; 1226 struct in6_ifaddr *oia; 1227 int s = splnet(); 1228 1229 TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list); 1230 1231 oia = ia; 1232 if (oia == (ia = in6_ifaddr)) 1233 in6_ifaddr = ia->ia_next; 1234 else { 1235 while (ia->ia_next && (ia->ia_next != oia)) 1236 ia = ia->ia_next; 1237 if (ia->ia_next) 1238 ia->ia_next = oia->ia_next; 1239 else { 1240 /* search failed */ 1241 printf("Couldn't unlink in6_ifaddr from in6_ifaddr\n"); 1242 } 1243 } 1244 1245 if (oia->ia6_ifpr) { /* check for safety */ 1246 plen = in6_mask2len(&oia->ia_prefixmask.sin6_addr, NULL); 1247 iilen = (sizeof(oia->ia_prefixmask.sin6_addr) << 3) - plen; 1248 in6_prefix_remove_ifid(iilen, oia); 1249 } 1250 1251 /* 1252 * When an autoconfigured address is being removed, release the 1253 * reference to the base prefix. Also, since the release might 1254 * affect the status of other (detached) addresses, call 1255 * pfxlist_onlink_check(). 1256 */ 1257 if ((oia->ia6_flags & IN6_IFF_AUTOCONF) != 0) { 1258 if (oia->ia6_ndpr == NULL) { 1259 log(LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address " 1260 "%p has no prefix\n", oia); 1261 } else { 1262 oia->ia6_ndpr->ndpr_refcnt--; 1263 oia->ia6_flags &= ~IN6_IFF_AUTOCONF; 1264 oia->ia6_ndpr = NULL; 1265 } 1266 1267 pfxlist_onlink_check(); 1268 } 1269 1270 /* 1271 * release another refcnt for the link from in6_ifaddr. 1272 * Note that we should decrement the refcnt at least once for all *BSD. 1273 */ 1274 IFAFREE(&oia->ia_ifa); 1275 1276 splx(s); 1277 } 1278 1279 void 1280 in6_purgeif(ifp) 1281 struct ifnet *ifp; 1282 { 1283 struct ifaddr *ifa, *nifa; 1284 1285 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa) 1286 { 1287 nifa = TAILQ_NEXT(ifa, ifa_list); 1288 if (ifa->ifa_addr->sa_family != AF_INET6) 1289 continue; 1290 in6_purgeaddr(ifa); 1291 } 1292 1293 in6_ifdetach(ifp); 1294 } 1295 1296 /* 1297 * SIOC[GAD]LIFADDR. 1298 * SIOCGLIFADDR: get first address. (?) 1299 * SIOCGLIFADDR with IFLR_PREFIX: 1300 * get first address that matches the specified prefix. 1301 * SIOCALIFADDR: add the specified address. 1302 * SIOCALIFADDR with IFLR_PREFIX: 1303 * add the specified prefix, filling hostid part from 1304 * the first link-local address. prefixlen must be <= 64. 1305 * SIOCDLIFADDR: delete the specified address. 1306 * SIOCDLIFADDR with IFLR_PREFIX: 1307 * delete the first address that matches the specified prefix. 1308 * return values: 1309 * EINVAL on invalid parameters 1310 * EADDRNOTAVAIL on prefix match failed/specified address not found 1311 * other values may be returned from in6_ioctl() 1312 * 1313 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1314 * this is to accomodate address naming scheme other than RFC2374, 1315 * in the future. 1316 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1317 * address encoding scheme. (see figure on page 8) 1318 */ 1319 static int 1320 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 1321 struct ifnet *ifp, struct thread *td) 1322 { 1323 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1324 struct ifaddr *ifa; 1325 struct sockaddr *sa; 1326 1327 /* sanity checks */ 1328 if (!data || !ifp) { 1329 panic("invalid argument to in6_lifaddr_ioctl"); 1330 /*NOTRECHED*/ 1331 } 1332 1333 switch (cmd) { 1334 case SIOCGLIFADDR: 1335 /* address must be specified on GET with IFLR_PREFIX */ 1336 if ((iflr->flags & IFLR_PREFIX) == 0) 1337 break; 1338 /* FALLTHROUGH */ 1339 case SIOCALIFADDR: 1340 case SIOCDLIFADDR: 1341 /* address must be specified on ADD and DELETE */ 1342 sa = (struct sockaddr *)&iflr->addr; 1343 if (sa->sa_family != AF_INET6) 1344 return EINVAL; 1345 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1346 return EINVAL; 1347 /* XXX need improvement */ 1348 sa = (struct sockaddr *)&iflr->dstaddr; 1349 if (sa->sa_family && sa->sa_family != AF_INET6) 1350 return EINVAL; 1351 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1352 return EINVAL; 1353 break; 1354 default: /* shouldn't happen */ 1355 #if 0 1356 panic("invalid cmd to in6_lifaddr_ioctl"); 1357 /* NOTREACHED */ 1358 #else 1359 return EOPNOTSUPP; 1360 #endif 1361 } 1362 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) 1363 return EINVAL; 1364 1365 switch (cmd) { 1366 case SIOCALIFADDR: 1367 { 1368 struct in6_aliasreq ifra; 1369 struct in6_addr *hostid = NULL; 1370 int prefixlen; 1371 1372 if ((iflr->flags & IFLR_PREFIX) != 0) { 1373 struct sockaddr_in6 *sin6; 1374 1375 /* 1376 * hostid is to fill in the hostid part of the 1377 * address. hostid points to the first link-local 1378 * address attached to the interface. 1379 */ 1380 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1381 if (!ifa) 1382 return EADDRNOTAVAIL; 1383 hostid = IFA_IN6(ifa); 1384 1385 /* prefixlen must be <= 64. */ 1386 if (64 < iflr->prefixlen) 1387 return EINVAL; 1388 prefixlen = iflr->prefixlen; 1389 1390 /* hostid part must be zero. */ 1391 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1392 if (sin6->sin6_addr.s6_addr32[2] != 0 1393 || sin6->sin6_addr.s6_addr32[3] != 0) { 1394 return EINVAL; 1395 } 1396 } else 1397 prefixlen = iflr->prefixlen; 1398 1399 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1400 bzero(&ifra, sizeof(ifra)); 1401 bcopy(iflr->iflr_name, ifra.ifra_name, 1402 sizeof(ifra.ifra_name)); 1403 1404 bcopy(&iflr->addr, &ifra.ifra_addr, 1405 ((struct sockaddr *)&iflr->addr)->sa_len); 1406 if (hostid) { 1407 /* fill in hostid part */ 1408 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1409 hostid->s6_addr32[2]; 1410 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1411 hostid->s6_addr32[3]; 1412 } 1413 1414 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/ 1415 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1416 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1417 if (hostid) { 1418 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1419 hostid->s6_addr32[2]; 1420 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1421 hostid->s6_addr32[3]; 1422 } 1423 } 1424 1425 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1426 in6_len2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1427 1428 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1429 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td); 1430 } 1431 case SIOCGLIFADDR: 1432 case SIOCDLIFADDR: 1433 { 1434 struct in6_ifaddr *ia; 1435 struct in6_addr mask, candidate, match; 1436 struct sockaddr_in6 *sin6; 1437 int cmp; 1438 1439 bzero(&mask, sizeof(mask)); 1440 if (iflr->flags & IFLR_PREFIX) { 1441 /* lookup a prefix rather than address. */ 1442 in6_len2mask(&mask, iflr->prefixlen); 1443 1444 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1445 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1446 match.s6_addr32[0] &= mask.s6_addr32[0]; 1447 match.s6_addr32[1] &= mask.s6_addr32[1]; 1448 match.s6_addr32[2] &= mask.s6_addr32[2]; 1449 match.s6_addr32[3] &= mask.s6_addr32[3]; 1450 1451 /* if you set extra bits, that's wrong */ 1452 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1453 return EINVAL; 1454 1455 cmp = 1; 1456 } else { 1457 if (cmd == SIOCGLIFADDR) { 1458 /* on getting an address, take the 1st match */ 1459 cmp = 0; /* XXX */ 1460 } else { 1461 /* on deleting an address, do exact match */ 1462 in6_len2mask(&mask, 128); 1463 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1464 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1465 1466 cmp = 1; 1467 } 1468 } 1469 1470 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1471 { 1472 if (ifa->ifa_addr->sa_family != AF_INET6) 1473 continue; 1474 if (!cmp) 1475 break; 1476 1477 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1478 #ifndef SCOPEDROUTING 1479 /* 1480 * XXX: this is adhoc, but is necessary to allow 1481 * a user to specify fe80::/64 (not /10) for a 1482 * link-local address. 1483 */ 1484 if (IN6_IS_ADDR_LINKLOCAL(&candidate)) 1485 candidate.s6_addr16[1] = 0; 1486 #endif 1487 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1488 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1489 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1490 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1491 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1492 break; 1493 } 1494 if (!ifa) 1495 return EADDRNOTAVAIL; 1496 ia = ifa2ia6(ifa); 1497 1498 if (cmd == SIOCGLIFADDR) { 1499 #ifndef SCOPEDROUTING 1500 struct sockaddr_in6 *s6; 1501 #endif 1502 1503 /* fill in the if_laddrreq structure */ 1504 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1505 #ifndef SCOPEDROUTING /* XXX see above */ 1506 s6 = (struct sockaddr_in6 *)&iflr->addr; 1507 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) { 1508 s6->sin6_addr.s6_addr16[1] = 0; 1509 s6->sin6_scope_id = 1510 in6_addr2scopeid(ifp, &s6->sin6_addr); 1511 } 1512 #endif 1513 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1514 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1515 ia->ia_dstaddr.sin6_len); 1516 #ifndef SCOPEDROUTING /* XXX see above */ 1517 s6 = (struct sockaddr_in6 *)&iflr->dstaddr; 1518 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) { 1519 s6->sin6_addr.s6_addr16[1] = 0; 1520 s6->sin6_scope_id = 1521 in6_addr2scopeid(ifp, 1522 &s6->sin6_addr); 1523 } 1524 #endif 1525 } else 1526 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1527 1528 iflr->prefixlen = 1529 in6_mask2len(&ia->ia_prefixmask.sin6_addr, 1530 NULL); 1531 1532 iflr->flags = ia->ia6_flags; /* XXX */ 1533 1534 return 0; 1535 } else { 1536 struct in6_aliasreq ifra; 1537 1538 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1539 bzero(&ifra, sizeof(ifra)); 1540 bcopy(iflr->iflr_name, ifra.ifra_name, 1541 sizeof(ifra.ifra_name)); 1542 1543 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1544 ia->ia_addr.sin6_len); 1545 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1546 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1547 ia->ia_dstaddr.sin6_len); 1548 } else { 1549 bzero(&ifra.ifra_dstaddr, 1550 sizeof(ifra.ifra_dstaddr)); 1551 } 1552 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1553 ia->ia_prefixmask.sin6_len); 1554 1555 ifra.ifra_flags = ia->ia6_flags; 1556 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, 1557 ifp, td); 1558 } 1559 } 1560 } 1561 1562 return EOPNOTSUPP; /* just for safety */ 1563 } 1564 1565 /* 1566 * Initialize an interface's intetnet6 address 1567 * and routing table entry. 1568 */ 1569 static int 1570 in6_ifinit(ifp, ia, sin6, newhost) 1571 struct ifnet *ifp; 1572 struct in6_ifaddr *ia; 1573 struct sockaddr_in6 *sin6; 1574 int newhost; 1575 { 1576 int error = 0, plen, ifacount = 0; 1577 int s = splimp(); 1578 struct ifaddr *ifa; 1579 1580 /* 1581 * Give the interface a chance to initialize 1582 * if this is its first address, 1583 * and to validate the address if necessary. 1584 */ 1585 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1586 { 1587 if (ifa->ifa_addr == NULL) 1588 continue; /* just for safety */ 1589 if (ifa->ifa_addr->sa_family != AF_INET6) 1590 continue; 1591 ifacount++; 1592 } 1593 1594 ia->ia_addr = *sin6; 1595 1596 if (ifacount <= 1 && ifp->if_ioctl && 1597 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) { 1598 splx(s); 1599 return(error); 1600 } 1601 splx(s); 1602 1603 ia->ia_ifa.ifa_metric = ifp->if_metric; 1604 1605 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1606 1607 /* 1608 * Special case: 1609 * If the destination address is specified for a point-to-point 1610 * interface, install a route to the destination as an interface 1611 * direct route. 1612 */ 1613 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1614 if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) { 1615 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, 1616 RTF_UP | RTF_HOST)) != 0) 1617 return(error); 1618 ia->ia_flags |= IFA_ROUTE; 1619 } 1620 if (plen < 128) { 1621 /* 1622 * The RTF_CLONING flag is necessary for in6_is_ifloop_auto(). 1623 */ 1624 ia->ia_ifa.ifa_flags |= RTF_CLONING; 1625 } 1626 1627 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1628 if (newhost) { 1629 /* set the rtrequest function to create llinfo */ 1630 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1631 in6_ifaddloop(&(ia->ia_ifa)); 1632 } 1633 1634 return(error); 1635 } 1636 1637 /* 1638 * Add an address to the list of IP6 multicast addresses for a 1639 * given interface. 1640 */ 1641 struct in6_multi * 1642 in6_addmulti(maddr6, ifp, errorp) 1643 struct in6_addr *maddr6; 1644 struct ifnet *ifp; 1645 int *errorp; 1646 { 1647 struct in6_multi *in6m; 1648 struct sockaddr_in6 sin6; 1649 struct ifmultiaddr *ifma; 1650 int s = splnet(); 1651 1652 *errorp = 0; 1653 1654 /* 1655 * Call generic routine to add membership or increment 1656 * refcount. It wants addresses in the form of a sockaddr, 1657 * so we build one here (being careful to zero the unused bytes). 1658 */ 1659 bzero(&sin6, sizeof sin6); 1660 sin6.sin6_family = AF_INET6; 1661 sin6.sin6_len = sizeof sin6; 1662 sin6.sin6_addr = *maddr6; 1663 *errorp = if_addmulti(ifp, (struct sockaddr *)&sin6, &ifma); 1664 if (*errorp) { 1665 splx(s); 1666 return 0; 1667 } 1668 1669 /* 1670 * If ifma->ifma_protospec is null, then if_addmulti() created 1671 * a new record. Otherwise, we are done. 1672 */ 1673 if (ifma->ifma_protospec != 0) 1674 return ifma->ifma_protospec; 1675 1676 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 1677 at interrupt time? If so, need to fix if_addmulti. XXX */ 1678 in6m = (struct in6_multi *)malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT); 1679 if (in6m == NULL) { 1680 splx(s); 1681 return (NULL); 1682 } 1683 1684 bzero(in6m, sizeof *in6m); 1685 in6m->in6m_addr = *maddr6; 1686 in6m->in6m_ifp = ifp; 1687 in6m->in6m_ifma = ifma; 1688 ifma->ifma_protospec = in6m; 1689 LIST_INSERT_HEAD(&in6_multihead, in6m, in6m_entry); 1690 1691 /* 1692 * Let MLD6 know that we have joined a new IP6 multicast 1693 * group. 1694 */ 1695 mld6_start_listening(in6m); 1696 splx(s); 1697 return(in6m); 1698 } 1699 1700 /* 1701 * Delete a multicast address record. 1702 */ 1703 void 1704 in6_delmulti(in6m) 1705 struct in6_multi *in6m; 1706 { 1707 struct ifmultiaddr *ifma = in6m->in6m_ifma; 1708 int s = splnet(); 1709 1710 if (ifma->ifma_refcount == 1) { 1711 /* 1712 * No remaining claims to this record; let MLD6 know 1713 * that we are leaving the multicast group. 1714 */ 1715 mld6_stop_listening(in6m); 1716 ifma->ifma_protospec = 0; 1717 LIST_REMOVE(in6m, in6m_entry); 1718 free(in6m, M_IPMADDR); 1719 } 1720 /* XXX - should be separate API for when we have an ifma? */ 1721 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1722 splx(s); 1723 } 1724 1725 /* 1726 * Find an IPv6 interface link-local address specific to an interface. 1727 */ 1728 struct in6_ifaddr * 1729 in6ifa_ifpforlinklocal(ifp, ignoreflags) 1730 struct ifnet *ifp; 1731 int ignoreflags; 1732 { 1733 struct ifaddr *ifa; 1734 1735 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1736 { 1737 if (ifa->ifa_addr == NULL) 1738 continue; /* just for safety */ 1739 if (ifa->ifa_addr->sa_family != AF_INET6) 1740 continue; 1741 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1742 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1743 ignoreflags) != 0) 1744 continue; 1745 break; 1746 } 1747 } 1748 1749 return((struct in6_ifaddr *)ifa); 1750 } 1751 1752 1753 /* 1754 * find the internet address corresponding to a given interface and address. 1755 */ 1756 struct in6_ifaddr * 1757 in6ifa_ifpwithaddr(ifp, addr) 1758 struct ifnet *ifp; 1759 struct in6_addr *addr; 1760 { 1761 struct ifaddr *ifa; 1762 1763 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1764 { 1765 if (ifa->ifa_addr == NULL) 1766 continue; /* just for safety */ 1767 if (ifa->ifa_addr->sa_family != AF_INET6) 1768 continue; 1769 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1770 break; 1771 } 1772 1773 return((struct in6_ifaddr *)ifa); 1774 } 1775 1776 /* 1777 * Convert IP6 address to printable (loggable) representation. 1778 */ 1779 static char digits[] = "0123456789abcdef"; 1780 static int ip6round = 0; 1781 char * 1782 ip6_sprintf(addr) 1783 const struct in6_addr *addr; 1784 { 1785 static char ip6buf[8][48]; 1786 int i; 1787 char *cp; 1788 const u_short *a = (const u_short *)addr; 1789 const u_char *d; 1790 int dcolon = 0; 1791 1792 ip6round = (ip6round + 1) & 7; 1793 cp = ip6buf[ip6round]; 1794 1795 for (i = 0; i < 8; i++) { 1796 if (dcolon == 1) { 1797 if (*a == 0) { 1798 if (i == 7) 1799 *cp++ = ':'; 1800 a++; 1801 continue; 1802 } else 1803 dcolon = 2; 1804 } 1805 if (*a == 0) { 1806 if (dcolon == 0 && *(a + 1) == 0) { 1807 if (i == 0) 1808 *cp++ = ':'; 1809 *cp++ = ':'; 1810 dcolon = 1; 1811 } else { 1812 *cp++ = '0'; 1813 *cp++ = ':'; 1814 } 1815 a++; 1816 continue; 1817 } 1818 d = (const u_char *)a; 1819 *cp++ = digits[*d >> 4]; 1820 *cp++ = digits[*d++ & 0xf]; 1821 *cp++ = digits[*d >> 4]; 1822 *cp++ = digits[*d & 0xf]; 1823 *cp++ = ':'; 1824 a++; 1825 } 1826 *--cp = 0; 1827 return(ip6buf[ip6round]); 1828 } 1829 1830 int 1831 in6_localaddr(in6) 1832 struct in6_addr *in6; 1833 { 1834 struct in6_ifaddr *ia; 1835 1836 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1837 return 1; 1838 1839 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 1840 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1841 &ia->ia_prefixmask.sin6_addr)) 1842 return 1; 1843 1844 return (0); 1845 } 1846 1847 int 1848 in6_is_addr_deprecated(sa6) 1849 struct sockaddr_in6 *sa6; 1850 { 1851 struct in6_ifaddr *ia; 1852 1853 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1854 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1855 &sa6->sin6_addr) && 1856 #ifdef SCOPEDROUTING 1857 ia->ia_addr.sin6_scope_id == sa6->sin6_scope_id && 1858 #endif 1859 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) 1860 return(1); /* true */ 1861 1862 /* XXX: do we still have to go thru the rest of the list? */ 1863 } 1864 1865 return(0); /* false */ 1866 } 1867 1868 /* 1869 * return length of part which dst and src are equal 1870 * hard coding... 1871 */ 1872 int 1873 in6_matchlen(src, dst) 1874 struct in6_addr *src, *dst; 1875 { 1876 int match = 0; 1877 u_char *s = (u_char *)src, *d = (u_char *)dst; 1878 u_char *lim = s + 16, r; 1879 1880 while (s < lim) 1881 if ((r = (*d++ ^ *s++)) != 0) { 1882 while (r < 128) { 1883 match++; 1884 r <<= 1; 1885 } 1886 break; 1887 } else 1888 match += 8; 1889 return match; 1890 } 1891 1892 /* XXX: to be scope conscious */ 1893 int 1894 in6_are_prefix_equal(p1, p2, len) 1895 struct in6_addr *p1, *p2; 1896 int len; 1897 { 1898 int bytelen, bitlen; 1899 1900 /* sanity check */ 1901 if (0 > len || len > 128) { 1902 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1903 len); 1904 return(0); 1905 } 1906 1907 bytelen = len / 8; 1908 bitlen = len % 8; 1909 1910 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1911 return(0); 1912 if (p1->s6_addr[bytelen] >> (8 - bitlen) != 1913 p2->s6_addr[bytelen] >> (8 - bitlen)) 1914 return(0); 1915 1916 return(1); 1917 } 1918 1919 void 1920 in6_prefixlen2mask(maskp, len) 1921 struct in6_addr *maskp; 1922 int len; 1923 { 1924 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1925 int bytelen, bitlen, i; 1926 1927 /* sanity check */ 1928 if (0 > len || len > 128) { 1929 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1930 len); 1931 return; 1932 } 1933 1934 bzero(maskp, sizeof(*maskp)); 1935 bytelen = len / 8; 1936 bitlen = len % 8; 1937 for (i = 0; i < bytelen; i++) 1938 maskp->s6_addr[i] = 0xff; 1939 if (bitlen) 1940 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1941 } 1942 1943 /* 1944 * return the best address out of the same scope 1945 */ 1946 struct in6_ifaddr * 1947 in6_ifawithscope(oifp, dst) 1948 struct ifnet *oifp; 1949 struct in6_addr *dst; 1950 { 1951 int dst_scope = in6_addrscope(dst), src_scope, best_scope = 0; 1952 int blen = -1; 1953 struct ifaddr *ifa; 1954 struct ifnet *ifp; 1955 struct in6_ifaddr *ifa_best = NULL; 1956 1957 if (oifp == NULL) { 1958 #if 0 1959 printf("in6_ifawithscope: output interface is not specified\n"); 1960 #endif 1961 return(NULL); 1962 } 1963 1964 /* 1965 * We search for all addresses on all interfaces from the beginning. 1966 * Comparing an interface with the outgoing interface will be done 1967 * only at the final stage of tiebreaking. 1968 */ 1969 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1970 { 1971 /* 1972 * We can never take an address that breaks the scope zone 1973 * of the destination. 1974 */ 1975 if (in6_addr2scopeid(ifp, dst) != in6_addr2scopeid(oifp, dst)) 1976 continue; 1977 1978 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1979 { 1980 int tlen = -1, dscopecmp, bscopecmp, matchcmp; 1981 1982 if (ifa->ifa_addr->sa_family != AF_INET6) 1983 continue; 1984 1985 src_scope = in6_addrscope(IFA_IN6(ifa)); 1986 1987 /* 1988 * Don't use an address before completing DAD 1989 * nor a duplicated address. 1990 */ 1991 if (((struct in6_ifaddr *)ifa)->ia6_flags & 1992 IN6_IFF_NOTREADY) 1993 continue; 1994 1995 /* XXX: is there any case to allow anycasts? */ 1996 if (((struct in6_ifaddr *)ifa)->ia6_flags & 1997 IN6_IFF_ANYCAST) 1998 continue; 1999 2000 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2001 IN6_IFF_DETACHED) 2002 continue; 2003 2004 /* 2005 * If this is the first address we find, 2006 * keep it anyway. 2007 */ 2008 if (ifa_best == NULL) 2009 goto replace; 2010 2011 /* 2012 * ifa_best is never NULL beyond this line except 2013 * within the block labeled "replace". 2014 */ 2015 2016 /* 2017 * If ifa_best has a smaller scope than dst and 2018 * the current address has a larger one than 2019 * (or equal to) dst, always replace ifa_best. 2020 * Also, if the current address has a smaller scope 2021 * than dst, ignore it unless ifa_best also has a 2022 * smaller scope. 2023 * Consequently, after the two if-clause below, 2024 * the followings must be satisfied: 2025 * (scope(src) < scope(dst) && 2026 * scope(best) < scope(dst)) 2027 * OR 2028 * (scope(best) >= scope(dst) && 2029 * scope(src) >= scope(dst)) 2030 */ 2031 if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0 && 2032 IN6_ARE_SCOPE_CMP(src_scope, dst_scope) >= 0) 2033 goto replace; /* (A) */ 2034 if (IN6_ARE_SCOPE_CMP(src_scope, dst_scope) < 0 && 2035 IN6_ARE_SCOPE_CMP(best_scope, dst_scope) >= 0) 2036 continue; /* (B) */ 2037 2038 /* 2039 * A deprecated address SHOULD NOT be used in new 2040 * communications if an alternate (non-deprecated) 2041 * address is available and has sufficient scope. 2042 * RFC 2462, Section 5.5.4. 2043 */ 2044 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2045 IN6_IFF_DEPRECATED) { 2046 /* 2047 * Ignore any deprecated addresses if 2048 * specified by configuration. 2049 */ 2050 if (!ip6_use_deprecated) 2051 continue; 2052 2053 /* 2054 * If we have already found a non-deprecated 2055 * candidate, just ignore deprecated addresses. 2056 */ 2057 if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) 2058 == 0) 2059 continue; 2060 } 2061 2062 /* 2063 * A non-deprecated address is always preferred 2064 * to a deprecated one regardless of scopes and 2065 * address matching (Note invariants ensured by the 2066 * conditions (A) and (B) above.) 2067 */ 2068 if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) && 2069 (((struct in6_ifaddr *)ifa)->ia6_flags & 2070 IN6_IFF_DEPRECATED) == 0) 2071 goto replace; 2072 2073 /* 2074 * When we use temporary addresses described in 2075 * RFC 3041, we prefer temporary addresses to 2076 * public autoconf addresses. Again, note the 2077 * invariants from (A) and (B). Also note that we 2078 * don't have any preference between static addresses 2079 * and autoconf addresses (despite of whether or not 2080 * the latter is temporary or public.) 2081 */ 2082 if (ip6_use_tempaddr) { 2083 struct in6_ifaddr *ifat; 2084 2085 ifat = (struct in6_ifaddr *)ifa; 2086 if ((ifa_best->ia6_flags & 2087 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2088 == IN6_IFF_AUTOCONF && 2089 (ifat->ia6_flags & 2090 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2091 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) { 2092 goto replace; 2093 } 2094 if ((ifa_best->ia6_flags & 2095 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2096 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY) && 2097 (ifat->ia6_flags & 2098 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2099 == IN6_IFF_AUTOCONF) { 2100 continue; 2101 } 2102 } 2103 2104 /* 2105 * At this point, we have two cases: 2106 * 1. we are looking at a non-deprecated address, 2107 * and ifa_best is also non-deprecated. 2108 * 2. we are looking at a deprecated address, 2109 * and ifa_best is also deprecated. 2110 * Also, we do not have to consider a case where 2111 * the scope of if_best is larger(smaller) than dst and 2112 * the scope of the current address is smaller(larger) 2113 * than dst. Such a case has already been covered. 2114 * Tiebreaking is done according to the following 2115 * items: 2116 * - the scope comparison between the address and 2117 * dst (dscopecmp) 2118 * - the scope comparison between the address and 2119 * ifa_best (bscopecmp) 2120 * - if the address match dst longer than ifa_best 2121 * (matchcmp) 2122 * - if the address is on the outgoing I/F (outI/F) 2123 * 2124 * Roughly speaking, the selection policy is 2125 * - the most important item is scope. The same scope 2126 * is best. Then search for a larger scope. 2127 * Smaller scopes are the last resort. 2128 * - A deprecated address is chosen only when we have 2129 * no address that has an enough scope, but is 2130 * prefered to any addresses of smaller scopes 2131 * (this must be already done above.) 2132 * - addresses on the outgoing I/F are preferred to 2133 * ones on other interfaces if none of above 2134 * tiebreaks. In the table below, the column "bI" 2135 * means if the best_ifa is on the outgoing 2136 * interface, and the column "sI" means if the ifa 2137 * is on the outgoing interface. 2138 * - If there is no other reasons to choose one, 2139 * longest address match against dst is considered. 2140 * 2141 * The precise decision table is as follows: 2142 * dscopecmp bscopecmp match bI oI | replace? 2143 * N/A equal N/A Y N | No (1) 2144 * N/A equal N/A N Y | Yes (2) 2145 * N/A equal larger N/A | Yes (3) 2146 * N/A equal !larger N/A | No (4) 2147 * larger larger N/A N/A | No (5) 2148 * larger smaller N/A N/A | Yes (6) 2149 * smaller larger N/A N/A | Yes (7) 2150 * smaller smaller N/A N/A | No (8) 2151 * equal smaller N/A N/A | Yes (9) 2152 * equal larger (already done at A above) 2153 */ 2154 dscopecmp = IN6_ARE_SCOPE_CMP(src_scope, dst_scope); 2155 bscopecmp = IN6_ARE_SCOPE_CMP(src_scope, best_scope); 2156 2157 if (bscopecmp == 0) { 2158 struct ifnet *bifp = ifa_best->ia_ifp; 2159 2160 if (bifp == oifp && ifp != oifp) /* (1) */ 2161 continue; 2162 if (bifp != oifp && ifp == oifp) /* (2) */ 2163 goto replace; 2164 2165 /* 2166 * Both bifp and ifp are on the outgoing 2167 * interface, or both two are on a different 2168 * interface from the outgoing I/F. 2169 * now we need address matching against dst 2170 * for tiebreaking. 2171 */ 2172 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2173 matchcmp = tlen - blen; 2174 if (matchcmp > 0) /* (3) */ 2175 goto replace; 2176 continue; /* (4) */ 2177 } 2178 if (dscopecmp > 0) { 2179 if (bscopecmp > 0) /* (5) */ 2180 continue; 2181 goto replace; /* (6) */ 2182 } 2183 if (dscopecmp < 0) { 2184 if (bscopecmp > 0) /* (7) */ 2185 goto replace; 2186 continue; /* (8) */ 2187 } 2188 2189 /* now dscopecmp must be 0 */ 2190 if (bscopecmp < 0) 2191 goto replace; /* (9) */ 2192 2193 replace: 2194 ifa_best = (struct in6_ifaddr *)ifa; 2195 blen = tlen >= 0 ? tlen : 2196 in6_matchlen(IFA_IN6(ifa), dst); 2197 best_scope = in6_addrscope(&ifa_best->ia_addr.sin6_addr); 2198 } 2199 } 2200 2201 /* count statistics for future improvements */ 2202 if (ifa_best == NULL) 2203 ip6stat.ip6s_sources_none++; 2204 else { 2205 if (oifp == ifa_best->ia_ifp) 2206 ip6stat.ip6s_sources_sameif[best_scope]++; 2207 else 2208 ip6stat.ip6s_sources_otherif[best_scope]++; 2209 2210 if (best_scope == dst_scope) 2211 ip6stat.ip6s_sources_samescope[best_scope]++; 2212 else 2213 ip6stat.ip6s_sources_otherscope[best_scope]++; 2214 2215 if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) != 0) 2216 ip6stat.ip6s_sources_deprecated[best_scope]++; 2217 } 2218 2219 return(ifa_best); 2220 } 2221 2222 /* 2223 * return the best address out of the same scope. if no address was 2224 * found, return the first valid address from designated IF. 2225 */ 2226 struct in6_ifaddr * 2227 in6_ifawithifp(ifp, dst) 2228 struct ifnet *ifp; 2229 struct in6_addr *dst; 2230 { 2231 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2232 struct ifaddr *ifa; 2233 struct in6_ifaddr *besta = 0; 2234 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2235 2236 dep[0] = dep[1] = NULL; 2237 2238 /* 2239 * We first look for addresses in the same scope. 2240 * If there is one, return it. 2241 * If two or more, return one which matches the dst longest. 2242 * If none, return one of global addresses assigned other ifs. 2243 */ 2244 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 2245 { 2246 if (ifa->ifa_addr->sa_family != AF_INET6) 2247 continue; 2248 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2249 continue; /* XXX: is there any case to allow anycast? */ 2250 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2251 continue; /* don't use this interface */ 2252 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2253 continue; 2254 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2255 if (ip6_use_deprecated) 2256 dep[0] = (struct in6_ifaddr *)ifa; 2257 continue; 2258 } 2259 2260 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2261 /* 2262 * call in6_matchlen() as few as possible 2263 */ 2264 if (besta) { 2265 if (blen == -1) 2266 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2267 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2268 if (tlen > blen) { 2269 blen = tlen; 2270 besta = (struct in6_ifaddr *)ifa; 2271 } 2272 } else 2273 besta = (struct in6_ifaddr *)ifa; 2274 } 2275 } 2276 if (besta) 2277 return(besta); 2278 2279 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 2280 { 2281 if (ifa->ifa_addr->sa_family != AF_INET6) 2282 continue; 2283 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2284 continue; /* XXX: is there any case to allow anycast? */ 2285 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2286 continue; /* don't use this interface */ 2287 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2288 continue; 2289 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2290 if (ip6_use_deprecated) 2291 dep[1] = (struct in6_ifaddr *)ifa; 2292 continue; 2293 } 2294 2295 return (struct in6_ifaddr *)ifa; 2296 } 2297 2298 /* use the last-resort values, that are, deprecated addresses */ 2299 if (dep[0]) 2300 return dep[0]; 2301 if (dep[1]) 2302 return dep[1]; 2303 2304 return NULL; 2305 } 2306 2307 /* 2308 * perform DAD when interface becomes IFF_UP. 2309 */ 2310 void 2311 in6_if_up(ifp) 2312 struct ifnet *ifp; 2313 { 2314 struct ifaddr *ifa; 2315 struct in6_ifaddr *ia; 2316 int dad_delay; /* delay ticks before DAD output */ 2317 2318 /* 2319 * special cases, like 6to4, are handled in in6_ifattach 2320 */ 2321 in6_ifattach(ifp, NULL); 2322 2323 dad_delay = 0; 2324 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 2325 { 2326 if (ifa->ifa_addr->sa_family != AF_INET6) 2327 continue; 2328 ia = (struct in6_ifaddr *)ifa; 2329 if (ia->ia6_flags & IN6_IFF_TENTATIVE) 2330 nd6_dad_start(ifa, &dad_delay); 2331 } 2332 } 2333 2334 int 2335 in6if_do_dad(ifp) 2336 struct ifnet *ifp; 2337 { 2338 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 2339 return(0); 2340 2341 switch (ifp->if_type) { 2342 #ifdef IFT_DUMMY 2343 case IFT_DUMMY: 2344 #endif 2345 case IFT_FAITH: 2346 /* 2347 * These interfaces do not have the IFF_LOOPBACK flag, 2348 * but loop packets back. We do not have to do DAD on such 2349 * interfaces. We should even omit it, because loop-backed 2350 * NS would confuse the DAD procedure. 2351 */ 2352 return(0); 2353 default: 2354 /* 2355 * Our DAD routine requires the interface up and running. 2356 * However, some interfaces can be up before the RUNNING 2357 * status. Additionaly, users may try to assign addresses 2358 * before the interface becomes up (or running). 2359 * We simply skip DAD in such a case as a work around. 2360 * XXX: we should rather mark "tentative" on such addresses, 2361 * and do DAD after the interface becomes ready. 2362 */ 2363 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != 2364 (IFF_UP|IFF_RUNNING)) 2365 return(0); 2366 2367 return(1); 2368 } 2369 } 2370 2371 /* 2372 * Calculate max IPv6 MTU through all the interfaces and store it 2373 * to in6_maxmtu. 2374 */ 2375 void 2376 in6_setmaxmtu() 2377 { 2378 unsigned long maxmtu = 0; 2379 struct ifnet *ifp; 2380 2381 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 2382 { 2383 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2384 nd_ifinfo[ifp->if_index].linkmtu > maxmtu) 2385 maxmtu = nd_ifinfo[ifp->if_index].linkmtu; 2386 } 2387 if (maxmtu) /* update only when maxmtu is positive */ 2388 in6_maxmtu = maxmtu; 2389 } 2390 2391 /* 2392 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2393 * v4 mapped addr or v4 compat addr 2394 */ 2395 void 2396 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2397 { 2398 bzero(sin, sizeof(*sin)); 2399 sin->sin_len = sizeof(struct sockaddr_in); 2400 sin->sin_family = AF_INET; 2401 sin->sin_port = sin6->sin6_port; 2402 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2403 } 2404 2405 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2406 void 2407 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2408 { 2409 bzero(sin6, sizeof(*sin6)); 2410 sin6->sin6_len = sizeof(struct sockaddr_in6); 2411 sin6->sin6_family = AF_INET6; 2412 sin6->sin6_port = sin->sin_port; 2413 sin6->sin6_addr.s6_addr32[0] = 0; 2414 sin6->sin6_addr.s6_addr32[1] = 0; 2415 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2416 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2417 } 2418 2419 /* Convert sockaddr_in6 into sockaddr_in. */ 2420 void 2421 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2422 { 2423 struct sockaddr_in *sin_p; 2424 struct sockaddr_in6 sin6; 2425 2426 /* 2427 * Save original sockaddr_in6 addr and convert it 2428 * to sockaddr_in. 2429 */ 2430 sin6 = *(struct sockaddr_in6 *)nam; 2431 sin_p = (struct sockaddr_in *)nam; 2432 in6_sin6_2_sin(sin_p, &sin6); 2433 } 2434 2435 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2436 void 2437 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2438 { 2439 struct sockaddr_in *sin_p; 2440 struct sockaddr_in6 *sin6_p; 2441 2442 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 2443 M_WAITOK); 2444 sin_p = (struct sockaddr_in *)*nam; 2445 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2446 FREE(*nam, M_SONAME); 2447 *nam = (struct sockaddr *)sin6_p; 2448 } 2449