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 1.15 2005/07/26 20:48:41 dillon Exp $ */ 3 /* $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $ */ 4 5 /* 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * Copyright (c) 1982, 1986, 1991, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by the University of 49 * California, Berkeley and its contributors. 50 * 4. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)in.c 8.2 (Berkeley) 11/15/93 67 */ 68 69 #include "opt_inet.h" 70 #include "opt_inet6.h" 71 72 #include <sys/param.h> 73 #include <sys/errno.h> 74 #include <sys/malloc.h> 75 #include <sys/socket.h> 76 #include <sys/socketvar.h> 77 #include <sys/sockio.h> 78 #include <sys/systm.h> 79 #include <sys/proc.h> 80 #include <sys/time.h> 81 #include <sys/kernel.h> 82 #include <sys/syslog.h> 83 #include <sys/thread2.h> 84 85 #include <net/if.h> 86 #include <net/if_types.h> 87 #include <net/route.h> 88 #include <net/if_dl.h> 89 90 #include <netinet/in.h> 91 #include <netinet/in_var.h> 92 #include <netinet/if_ether.h> 93 #include <netinet/in_systm.h> 94 #include <netinet/ip.h> 95 #include <netinet/in_pcb.h> 96 97 #include <netinet/ip6.h> 98 #include <netinet6/ip6_var.h> 99 #include <netinet6/nd6.h> 100 #include <netinet6/mld6_var.h> 101 #include <netinet6/ip6_mroute.h> 102 #include <netinet6/in6_ifattach.h> 103 #include <netinet6/scope6_var.h> 104 #include <netinet6/in6_pcb.h> 105 106 #include <net/net_osdep.h> 107 108 MALLOC_DEFINE(M_IPMADDR, "in6_multi", "internet multicast address"); 109 110 /* 111 * Definitions of some costant IP6 addresses. 112 */ 113 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 114 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 115 const struct in6_addr in6addr_nodelocal_allnodes = 116 IN6ADDR_NODELOCAL_ALLNODES_INIT; 117 const struct in6_addr in6addr_linklocal_allnodes = 118 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 119 const struct in6_addr in6addr_linklocal_allrouters = 120 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 121 122 const struct in6_addr in6mask0 = IN6MASK0; 123 const struct in6_addr in6mask32 = IN6MASK32; 124 const struct in6_addr in6mask64 = IN6MASK64; 125 const struct in6_addr in6mask96 = IN6MASK96; 126 const struct in6_addr in6mask128 = IN6MASK128; 127 128 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6, 129 0, 0, IN6ADDR_ANY_INIT, 0}; 130 131 static int in6_lifaddr_ioctl (struct socket *, u_long, caddr_t, 132 struct ifnet *, struct thread *); 133 static int in6_ifinit (struct ifnet *, struct in6_ifaddr *, 134 struct sockaddr_in6 *, int); 135 static void in6_unlink_ifa (struct in6_ifaddr *, struct ifnet *); 136 137 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 rtentry *nrt = NULL; 150 int e; 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 e = rtrequest(cmd, ifa->ifa_addr, ifa->ifa_addr, 166 (struct sockaddr *)&all1_sa, 167 RTF_UP|RTF_HOST|RTF_LLINFO, &nrt); 168 if (e != 0) { 169 log(LOG_ERR, "in6_ifloop_request: " 170 "%s operation failed for %s (errno=%d)\n", 171 cmd == RTM_ADD ? "ADD" : "DELETE", 172 ip6_sprintf(&((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr), 173 e); 174 } 175 176 /* 177 * Make sure rt_ifa be equal to IFA, the second argument of the 178 * function. 179 * We need this because when we refer to rt_ifa->ia6_flags in 180 * ip6_input, we assume that the rt_ifa points to the address instead 181 * of the loopback address. 182 */ 183 if (cmd == RTM_ADD && nrt && ifa != nrt->rt_ifa) { 184 IFAFREE(nrt->rt_ifa); 185 IFAREF(ifa); 186 nrt->rt_ifa = ifa; 187 } 188 189 /* 190 * Report the addition/removal of the address to the routing socket. 191 * XXX: since we called rtinit for a p2p interface with a destination, 192 * we end up reporting twice in such a case. Should we rather 193 * omit the second report? 194 */ 195 if (nrt) { 196 rt_newaddrmsg(cmd, ifa, e, nrt); 197 if (cmd == RTM_DELETE) { 198 if (nrt->rt_refcnt <= 0) { 199 /* XXX: we should free the entry ourselves. */ 200 nrt->rt_refcnt++; 201 rtfree(nrt); 202 } 203 } else { 204 /* the cmd must be RTM_ADD here */ 205 nrt->rt_refcnt--; 206 } 207 } 208 } 209 210 /* 211 * Add ownaddr as loopback rtentry. We previously add the route only if 212 * necessary (ex. on a p2p link). However, since we now manage addresses 213 * separately from prefixes, we should always add the route. We can't 214 * rely on the cloning mechanism from the corresponding interface route 215 * any more. 216 */ 217 static void 218 in6_ifaddloop(struct ifaddr *ifa) 219 { 220 struct rtentry *rt; 221 222 /* If there is no loopback entry, allocate one. */ 223 rt = rtpurelookup(ifa->ifa_addr); 224 if (rt == NULL || !(rt->rt_flags & RTF_HOST) || 225 !(rt->rt_ifp->if_flags & IFF_LOOPBACK)) 226 in6_ifloop_request(RTM_ADD, ifa); 227 if (rt != NULL) 228 rt->rt_refcnt--; 229 } 230 231 /* 232 * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(), 233 * if it exists. 234 */ 235 static void 236 in6_ifremloop(struct ifaddr *ifa) 237 { 238 struct in6_ifaddr *ia; 239 struct rtentry *rt; 240 int ia_count = 0; 241 242 /* 243 * Some of BSD variants do not remove cloned routes 244 * from an interface direct route, when removing the direct route 245 * (see comments in net/net_osdep.h). Even for variants that do remove 246 * cloned routes, they could fail to remove the cloned routes when 247 * we handle multple addresses that share a common prefix. 248 * So, we should remove the route corresponding to the deleted address 249 * regardless of the result of in6_is_ifloop_auto(). 250 */ 251 252 /* 253 * Delete the entry only if exact one ifa exists. More than one ifa 254 * can exist if we assign a same single address to multiple 255 * (probably p2p) interfaces. 256 * XXX: we should avoid such a configuration in IPv6... 257 */ 258 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 259 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) { 260 ia_count++; 261 if (ia_count > 1) 262 break; 263 } 264 } 265 266 if (ia_count == 1) { 267 /* 268 * Before deleting, check if a corresponding loopbacked host 269 * route surely exists. With this check, we can avoid to 270 * delete an interface direct route whose destination is same 271 * as the address being removed. This can happen when remofing 272 * a subnet-router anycast address on an interface attahced 273 * to a shared medium. 274 */ 275 rt = rtpurelookup(ifa->ifa_addr); 276 if (rt != NULL && (rt->rt_flags & RTF_HOST) && 277 (rt->rt_ifp->if_flags & IFF_LOOPBACK)) { 278 rt->rt_refcnt--; 279 in6_ifloop_request(RTM_DELETE, ifa); 280 } 281 } 282 } 283 284 int 285 in6_ifindex2scopeid(int idx) 286 { 287 struct ifnet *ifp; 288 struct ifaddr *ifa; 289 struct sockaddr_in6 *sin6; 290 291 if (idx < 0 || if_index < idx) 292 return -1; 293 ifp = ifindex2ifnet[idx]; 294 295 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 296 { 297 if (ifa->ifa_addr->sa_family != AF_INET6) 298 continue; 299 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 300 if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) 301 return sin6->sin6_scope_id & 0xffff; 302 } 303 304 return -1; 305 } 306 307 int 308 in6_mask2len(struct in6_addr *mask, u_char *lim0) 309 { 310 int x = 0, y; 311 u_char *lim = lim0, *p; 312 313 if (lim0 == NULL || 314 lim0 - (u_char *)mask > sizeof(*mask)) /* ignore the scope_id part */ 315 lim = (u_char *)mask + sizeof(*mask); 316 for (p = (u_char *)mask; p < lim; x++, p++) { 317 if (*p != 0xff) 318 break; 319 } 320 y = 0; 321 if (p < lim) { 322 for (y = 0; y < 8; y++) { 323 if ((*p & (0x80 >> y)) == 0) 324 break; 325 } 326 } 327 328 /* 329 * when the limit pointer is given, do a stricter check on the 330 * remaining bits. 331 */ 332 if (p < lim) { 333 if (y != 0 && (*p & (0x00ff >> y)) != 0) 334 return(-1); 335 for (p = p + 1; p < lim; p++) 336 if (*p != 0) 337 return(-1); 338 } 339 340 return x * 8 + y; 341 } 342 343 void 344 in6_len2mask(struct in6_addr *mask, int len) 345 { 346 int i; 347 348 bzero(mask, sizeof(*mask)); 349 for (i = 0; i < len / 8; i++) 350 mask->s6_addr8[i] = 0xff; 351 if (len % 8) 352 mask->s6_addr8[i] = (0xff00 >> (len % 8)) & 0xff; 353 } 354 355 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 356 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 357 358 int 359 in6_control(struct socket *so, u_long cmd, caddr_t data, 360 struct ifnet *ifp, struct thread *td) 361 { 362 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 363 struct in6_ifaddr *ia = NULL; 364 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 365 int privileged; 366 367 privileged = 0; 368 if (suser(td) == 0) 369 privileged++; 370 371 switch (cmd) { 372 case SIOCGETSGCNT_IN6: 373 case SIOCGETMIFCNT_IN6: 374 return (mrt6_ioctl(cmd, data)); 375 } 376 377 if (ifp == NULL) 378 return(EOPNOTSUPP); 379 380 switch (cmd) { 381 case SIOCSNDFLUSH_IN6: 382 case SIOCSPFXFLUSH_IN6: 383 case SIOCSRTRFLUSH_IN6: 384 case SIOCSDEFIFACE_IN6: 385 case SIOCSIFINFO_FLAGS: 386 if (!privileged) 387 return(EPERM); 388 /* fall through */ 389 case OSIOCGIFINFO_IN6: 390 case SIOCGIFINFO_IN6: 391 case SIOCGDRLST_IN6: 392 case SIOCGPRLST_IN6: 393 case SIOCGNBRINFO_IN6: 394 case SIOCGDEFIFACE_IN6: 395 return(nd6_ioctl(cmd, data, ifp)); 396 } 397 398 switch (cmd) { 399 case SIOCSIFPREFIX_IN6: 400 case SIOCDIFPREFIX_IN6: 401 case SIOCAIFPREFIX_IN6: 402 case SIOCCIFPREFIX_IN6: 403 case SIOCSGIFPREFIX_IN6: 404 case SIOCGIFPREFIX_IN6: 405 log(LOG_NOTICE, 406 "prefix ioctls are now invalidated. " 407 "please use ifconfig.\n"); 408 return(EOPNOTSUPP); 409 } 410 411 switch (cmd) { 412 case SIOCSSCOPE6: 413 if (!privileged) 414 return(EPERM); 415 return(scope6_set(ifp, 416 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 417 break; 418 case SIOCGSCOPE6: 419 return(scope6_get(ifp, 420 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 421 break; 422 case SIOCGSCOPE6DEF: 423 return(scope6_get_default((struct scope6_id *) 424 ifr->ifr_ifru.ifru_scope_id)); 425 break; 426 } 427 428 switch (cmd) { 429 case SIOCALIFADDR: 430 case SIOCDLIFADDR: 431 if (!privileged) 432 return(EPERM); 433 /* fall through */ 434 case SIOCGLIFADDR: 435 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 436 } 437 438 /* 439 * Find address for this interface, if it exists. 440 */ 441 if (ifra->ifra_addr.sin6_family == AF_INET6) { /* XXX */ 442 struct sockaddr_in6 *sa6 = 443 (struct sockaddr_in6 *)&ifra->ifra_addr; 444 445 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) { 446 if (sa6->sin6_addr.s6_addr16[1] == 0) { 447 /* link ID is not embedded by the user */ 448 sa6->sin6_addr.s6_addr16[1] = 449 htons(ifp->if_index); 450 } else if (sa6->sin6_addr.s6_addr16[1] != 451 htons(ifp->if_index)) { 452 return(EINVAL); /* link ID contradicts */ 453 } 454 if (sa6->sin6_scope_id) { 455 if (sa6->sin6_scope_id != 456 (u_int32_t)ifp->if_index) 457 return(EINVAL); 458 sa6->sin6_scope_id = 0; /* XXX: good way? */ 459 } 460 } 461 ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr); 462 } 463 464 switch (cmd) { 465 case SIOCSIFADDR_IN6: 466 case SIOCSIFDSTADDR_IN6: 467 case SIOCSIFNETMASK_IN6: 468 /* 469 * Since IPv6 allows a node to assign multiple addresses 470 * on a single interface, SIOCSIFxxx ioctls are not suitable 471 * and should be unused. 472 */ 473 /* we decided to obsolete this command (20000704) */ 474 return(EINVAL); 475 476 case SIOCDIFADDR_IN6: 477 /* 478 * for IPv4, we look for existing in_ifaddr here to allow 479 * "ifconfig if0 delete" to remove first IPv4 address on the 480 * interface. For IPv6, as the spec allow multiple interface 481 * address from the day one, we consider "remove the first one" 482 * semantics to be not preferable. 483 */ 484 if (ia == NULL) 485 return(EADDRNOTAVAIL); 486 /* FALLTHROUGH */ 487 case SIOCAIFADDR_IN6: 488 /* 489 * We always require users to specify a valid IPv6 address for 490 * the corresponding operation. 491 */ 492 if (ifra->ifra_addr.sin6_family != AF_INET6 || 493 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) 494 return(EAFNOSUPPORT); 495 if (!privileged) 496 return(EPERM); 497 498 break; 499 500 case SIOCGIFADDR_IN6: 501 /* This interface is basically deprecated. use SIOCGIFCONF. */ 502 /* fall through */ 503 case SIOCGIFAFLAG_IN6: 504 case SIOCGIFNETMASK_IN6: 505 case SIOCGIFDSTADDR_IN6: 506 case SIOCGIFALIFETIME_IN6: 507 /* must think again about its semantics */ 508 if (ia == NULL) 509 return(EADDRNOTAVAIL); 510 break; 511 case SIOCSIFALIFETIME_IN6: 512 { 513 struct in6_addrlifetime *lt; 514 515 if (!privileged) 516 return(EPERM); 517 if (ia == NULL) 518 return(EADDRNOTAVAIL); 519 /* sanity for overflow - beware unsigned */ 520 lt = &ifr->ifr_ifru.ifru_lifetime; 521 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME 522 && lt->ia6t_vltime + time_second < time_second) { 523 return EINVAL; 524 } 525 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME 526 && lt->ia6t_pltime + time_second < time_second) { 527 return EINVAL; 528 } 529 break; 530 } 531 } 532 533 switch (cmd) { 534 535 case SIOCGIFADDR_IN6: 536 ifr->ifr_addr = ia->ia_addr; 537 break; 538 539 case SIOCGIFDSTADDR_IN6: 540 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 541 return(EINVAL); 542 /* 543 * XXX: should we check if ifa_dstaddr is NULL and return 544 * an error? 545 */ 546 ifr->ifr_dstaddr = ia->ia_dstaddr; 547 break; 548 549 case SIOCGIFNETMASK_IN6: 550 ifr->ifr_addr = ia->ia_prefixmask; 551 break; 552 553 case SIOCGIFAFLAG_IN6: 554 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 555 break; 556 557 case SIOCGIFSTAT_IN6: 558 if (ifp == NULL) 559 return EINVAL; 560 bzero(&ifr->ifr_ifru.ifru_stat, 561 sizeof(ifr->ifr_ifru.ifru_stat)); 562 ifr->ifr_ifru.ifru_stat = 563 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat; 564 break; 565 566 case SIOCGIFSTAT_ICMP6: 567 bzero(&ifr->ifr_ifru.ifru_stat, 568 sizeof(ifr->ifr_ifru.ifru_icmp6stat)); 569 ifr->ifr_ifru.ifru_icmp6stat = 570 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat; 571 break; 572 573 case SIOCGIFALIFETIME_IN6: 574 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 575 break; 576 577 case SIOCSIFALIFETIME_IN6: 578 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; 579 /* for sanity */ 580 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 581 ia->ia6_lifetime.ia6t_expire = 582 time_second + ia->ia6_lifetime.ia6t_vltime; 583 } else 584 ia->ia6_lifetime.ia6t_expire = 0; 585 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 586 ia->ia6_lifetime.ia6t_preferred = 587 time_second + ia->ia6_lifetime.ia6t_pltime; 588 } else 589 ia->ia6_lifetime.ia6t_preferred = 0; 590 break; 591 592 case SIOCAIFADDR_IN6: 593 { 594 int i, error = 0; 595 struct nd_prefix pr0, *pr; 596 597 /* 598 * first, make or update the interface address structure, 599 * and link it to the list. 600 */ 601 if ((error = in6_update_ifa(ifp, ifra, ia)) != 0) 602 return(error); 603 604 /* 605 * then, make the prefix on-link on the interface. 606 * XXX: we'd rather create the prefix before the address, but 607 * we need at least one address to install the corresponding 608 * interface route, so we configure the address first. 609 */ 610 611 /* 612 * convert mask to prefix length (prefixmask has already 613 * been validated in in6_update_ifa(). 614 */ 615 bzero(&pr0, sizeof(pr0)); 616 pr0.ndpr_ifp = ifp; 617 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 618 NULL); 619 if (pr0.ndpr_plen == 128) 620 break; /* we don't need to install a host route. */ 621 pr0.ndpr_prefix = ifra->ifra_addr; 622 pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr; 623 /* apply the mask for safety. */ 624 for (i = 0; i < 4; i++) { 625 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 626 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i]; 627 } 628 /* 629 * XXX: since we don't have an API to set prefix (not address) 630 * lifetimes, we just use the same lifetimes as addresses. 631 * The (temporarily) installed lifetimes can be overridden by 632 * later advertised RAs (when accept_rtadv is non 0), which is 633 * an intended behavior. 634 */ 635 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 636 pr0.ndpr_raf_auto = 637 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 638 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 639 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 640 641 /* add the prefix if there's one. */ 642 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 643 /* 644 * nd6_prelist_add will install the corresponding 645 * interface route. 646 */ 647 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) 648 return(error); 649 if (pr == NULL) { 650 log(LOG_ERR, "nd6_prelist_add succedded but " 651 "no prefix\n"); 652 return(EINVAL); /* XXX panic here? */ 653 } 654 } 655 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 656 == NULL) { 657 /* XXX: this should not happen! */ 658 log(LOG_ERR, "in6_control: addition succeeded, but" 659 " no ifaddr\n"); 660 } else { 661 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) != 0 && 662 ia->ia6_ndpr == NULL) { /* new autoconfed addr */ 663 ia->ia6_ndpr = pr; 664 pr->ndpr_refcnt++; 665 666 /* 667 * If this is the first autoconf address from 668 * the prefix, create a temporary address 669 * as well (when specified). 670 */ 671 if (ip6_use_tempaddr && 672 pr->ndpr_refcnt == 1) { 673 int e; 674 if ((e = in6_tmpifadd(ia, 1)) != 0) { 675 log(LOG_NOTICE, "in6_control: " 676 "failed to create a " 677 "temporary address, " 678 "errno=%d\n", 679 e); 680 } 681 } 682 } 683 684 /* 685 * this might affect the status of autoconfigured 686 * addresses, that is, this address might make 687 * other addresses detached. 688 */ 689 pfxlist_onlink_check(); 690 } 691 if (error == 0 && ia) 692 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 693 break; 694 } 695 696 case SIOCDIFADDR_IN6: 697 { 698 int i = 0; 699 struct nd_prefix pr0, *pr; 700 701 /* 702 * If the address being deleted is the only one that owns 703 * the corresponding prefix, expire the prefix as well. 704 * XXX: theoretically, we don't have to warry about such 705 * relationship, since we separate the address management 706 * and the prefix management. We do this, however, to provide 707 * as much backward compatibility as possible in terms of 708 * the ioctl operation. 709 */ 710 bzero(&pr0, sizeof(pr0)); 711 pr0.ndpr_ifp = ifp; 712 pr0.ndpr_plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, 713 NULL); 714 if (pr0.ndpr_plen == 128) 715 goto purgeaddr; 716 pr0.ndpr_prefix = ia->ia_addr; 717 pr0.ndpr_mask = ia->ia_prefixmask.sin6_addr; 718 for (i = 0; i < 4; i++) { 719 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 720 ia->ia_prefixmask.sin6_addr.s6_addr32[i]; 721 } 722 /* 723 * The logic of the following condition is a bit complicated. 724 * We expire the prefix when 725 * 1. the address obeys autoconfiguration and it is the 726 * only owner of the associated prefix, or 727 * 2. the address does not obey autoconf and there is no 728 * other owner of the prefix. 729 */ 730 if ((pr = nd6_prefix_lookup(&pr0)) != NULL && 731 (((ia->ia6_flags & IN6_IFF_AUTOCONF) != 0 && 732 pr->ndpr_refcnt == 1) || 733 ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0 && 734 pr->ndpr_refcnt == 0))) { 735 pr->ndpr_expire = 1; /* XXX: just for expiration */ 736 } 737 738 purgeaddr: 739 in6_purgeaddr(&ia->ia_ifa); 740 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 741 break; 742 } 743 744 default: 745 if (ifp == NULL || ifp->if_ioctl == 0) 746 return(EOPNOTSUPP); 747 return((*ifp->if_ioctl)(ifp, cmd, data, td->td_proc->p_ucred)); 748 } 749 750 return(0); 751 } 752 753 /* 754 * Update parameters of an IPv6 interface address. 755 * If necessary, a new entry is created and linked into address chains. 756 * This function is separated from in6_control(). 757 * XXX: should this be performed under splnet()? 758 */ 759 int 760 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 761 struct in6_ifaddr *ia) 762 { 763 int error = 0, hostIsNew = 0, plen = -1; 764 struct in6_ifaddr *oia; 765 struct sockaddr_in6 dst6; 766 struct in6_addrlifetime *lt; 767 768 /* Validate parameters */ 769 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 770 return(EINVAL); 771 772 /* 773 * The destination address for a p2p link must have a family 774 * of AF_UNSPEC or AF_INET6. 775 */ 776 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 777 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 778 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 779 return(EAFNOSUPPORT); 780 /* 781 * validate ifra_prefixmask. don't check sin6_family, netmask 782 * does not carry fields other than sin6_len. 783 */ 784 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 785 return(EINVAL); 786 /* 787 * Because the IPv6 address architecture is classless, we require 788 * users to specify a (non 0) prefix length (mask) for a new address. 789 * We also require the prefix (when specified) mask is valid, and thus 790 * reject a non-consecutive mask. 791 */ 792 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 793 return(EINVAL); 794 if (ifra->ifra_prefixmask.sin6_len != 0) { 795 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 796 (u_char *)&ifra->ifra_prefixmask + 797 ifra->ifra_prefixmask.sin6_len); 798 if (plen <= 0) 799 return(EINVAL); 800 } 801 else { 802 /* 803 * In this case, ia must not be NULL. We just use its prefix 804 * length. 805 */ 806 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 807 } 808 /* 809 * If the destination address on a p2p interface is specified, 810 * and the address is a scoped one, validate/set the scope 811 * zone identifier. 812 */ 813 dst6 = ifra->ifra_dstaddr; 814 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) && 815 (dst6.sin6_family == AF_INET6)) { 816 int scopeid; 817 818 if ((error = in6_recoverscope(&dst6, 819 &ifra->ifra_dstaddr.sin6_addr, 820 ifp)) != 0) 821 return(error); 822 scopeid = in6_addr2scopeid(ifp, &dst6.sin6_addr); 823 if (dst6.sin6_scope_id == 0) /* user omit to specify the ID. */ 824 dst6.sin6_scope_id = scopeid; 825 else if (dst6.sin6_scope_id != scopeid) 826 return(EINVAL); /* scope ID mismatch. */ 827 if ((error = in6_embedscope(&dst6.sin6_addr, &dst6, NULL, NULL)) 828 != 0) 829 return(error); 830 dst6.sin6_scope_id = 0; /* XXX */ 831 } 832 /* 833 * The destination address can be specified only for a p2p or a 834 * loopback interface. If specified, the corresponding prefix length 835 * must be 128. 836 */ 837 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 838 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 839 /* XXX: noisy message */ 840 log(LOG_INFO, "in6_update_ifa: a destination can be " 841 "specified for a p2p or a loopback IF only\n"); 842 return(EINVAL); 843 } 844 if (plen != 128) { 845 /* 846 * The following message seems noisy, but we dare to 847 * add it for diagnosis. 848 */ 849 log(LOG_INFO, "in6_update_ifa: prefixlen must be 128 " 850 "when dstaddr is specified\n"); 851 return(EINVAL); 852 } 853 } 854 /* lifetime consistency check */ 855 lt = &ifra->ifra_lifetime; 856 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME 857 && lt->ia6t_vltime + time_second < time_second) { 858 return EINVAL; 859 } 860 if (lt->ia6t_vltime == 0) { 861 /* 862 * the following log might be noisy, but this is a typical 863 * configuration mistake or a tool's bug. 864 */ 865 log(LOG_INFO, 866 "in6_update_ifa: valid lifetime is 0 for %s\n", 867 ip6_sprintf(&ifra->ifra_addr.sin6_addr)); 868 } 869 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME 870 && lt->ia6t_pltime + time_second < time_second) { 871 return EINVAL; 872 } 873 874 /* 875 * If this is a new address, allocate a new ifaddr and link it 876 * into chains. 877 */ 878 if (ia == NULL) { 879 hostIsNew = 1; 880 /* 881 * When in6_update_ifa() is called in a process of a received 882 * RA, it is called under splnet(). So, we should call malloc 883 * with M_NOWAIT. 884 */ 885 ia = (struct in6_ifaddr *) 886 malloc(sizeof(*ia), M_IFADDR, M_NOWAIT); 887 if (ia == NULL) 888 return (ENOBUFS); 889 bzero((caddr_t)ia, sizeof(*ia)); 890 /* Initialize the address and masks */ 891 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 892 ia->ia_addr.sin6_family = AF_INET6; 893 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 894 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 895 /* 896 * XXX: some functions expect that ifa_dstaddr is not 897 * NULL for p2p interfaces. 898 */ 899 ia->ia_ifa.ifa_dstaddr 900 = (struct sockaddr *)&ia->ia_dstaddr; 901 } else { 902 ia->ia_ifa.ifa_dstaddr = NULL; 903 } 904 ia->ia_ifa.ifa_netmask 905 = (struct sockaddr *)&ia->ia_prefixmask; 906 907 ia->ia_ifp = ifp; 908 if ((oia = in6_ifaddr) != NULL) { 909 for ( ; oia->ia_next; oia = oia->ia_next) 910 continue; 911 oia->ia_next = ia; 912 } else 913 in6_ifaddr = ia; 914 915 TAILQ_INSERT_TAIL(&ifp->if_addrlist, &ia->ia_ifa, 916 ifa_list); 917 } 918 919 /* set prefix mask */ 920 if (ifra->ifra_prefixmask.sin6_len) { 921 /* 922 * We prohibit changing the prefix length of an existing 923 * address, because 924 * + such an operation should be rare in IPv6, and 925 * + the operation would confuse prefix management. 926 */ 927 if (ia->ia_prefixmask.sin6_len && 928 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 929 log(LOG_INFO, "in6_update_ifa: the prefix length of an" 930 " existing (%s) address should not be changed\n", 931 ip6_sprintf(&ia->ia_addr.sin6_addr)); 932 error = EINVAL; 933 goto unlink; 934 } 935 ia->ia_prefixmask = ifra->ifra_prefixmask; 936 } 937 938 /* 939 * If a new destination address is specified, scrub the old one and 940 * install the new destination. Note that the interface must be 941 * p2p or loopback (see the check above.) 942 */ 943 if (dst6.sin6_family == AF_INET6 && 944 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, 945 &ia->ia_dstaddr.sin6_addr)) { 946 int e; 947 948 if ((ia->ia_flags & IFA_ROUTE) != 0 && 949 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 950 != 0) { 951 log(LOG_ERR, "in6_update_ifa: failed to remove " 952 "a route to the old destination: %s\n", 953 ip6_sprintf(&ia->ia_addr.sin6_addr)); 954 /* proceed anyway... */ 955 } 956 else 957 ia->ia_flags &= ~IFA_ROUTE; 958 ia->ia_dstaddr = dst6; 959 } 960 961 /* reset the interface and routing table appropriately. */ 962 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 963 goto unlink; 964 965 /* 966 * Beyond this point, we should call in6_purgeaddr upon an error, 967 * not just go to unlink. 968 */ 969 970 #if 0 /* disable this mechanism for now */ 971 /* update prefix list */ 972 if (hostIsNew && 973 (ifra->ifra_flags & IN6_IFF_NOPFX) == 0) { /* XXX */ 974 int iilen; 975 976 iilen = (sizeof(ia->ia_prefixmask.sin6_addr) << 3) - plen; 977 if ((error = in6_prefix_add_ifid(iilen, ia)) != 0) { 978 in6_purgeaddr((struct ifaddr *)ia); 979 return(error); 980 } 981 } 982 #endif 983 984 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 985 struct sockaddr_in6 mltaddr, mltmask; 986 struct in6_multi *in6m; 987 988 if (hostIsNew) { 989 /* 990 * join solicited multicast addr for new host id 991 */ 992 struct in6_addr llsol; 993 bzero(&llsol, sizeof(struct in6_addr)); 994 llsol.s6_addr16[0] = htons(0xff02); 995 llsol.s6_addr16[1] = htons(ifp->if_index); 996 llsol.s6_addr32[1] = 0; 997 llsol.s6_addr32[2] = htonl(1); 998 llsol.s6_addr32[3] = 999 ifra->ifra_addr.sin6_addr.s6_addr32[3]; 1000 llsol.s6_addr8[12] = 0xff; 1001 (void)in6_addmulti(&llsol, ifp, &error); 1002 if (error != 0) { 1003 log(LOG_WARNING, 1004 "in6_update_ifa: addmulti failed for " 1005 "%s on %s (errno=%d)\n", 1006 ip6_sprintf(&llsol), if_name(ifp), 1007 error); 1008 in6_purgeaddr((struct ifaddr *)ia); 1009 return(error); 1010 } 1011 } 1012 1013 bzero(&mltmask, sizeof(mltmask)); 1014 mltmask.sin6_len = sizeof(struct sockaddr_in6); 1015 mltmask.sin6_family = AF_INET6; 1016 mltmask.sin6_addr = in6mask32; 1017 1018 /* 1019 * join link-local all-nodes address 1020 */ 1021 bzero(&mltaddr, sizeof(mltaddr)); 1022 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 1023 mltaddr.sin6_family = AF_INET6; 1024 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 1025 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1026 1027 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1028 if (in6m == NULL) { 1029 rtrequest(RTM_ADD, 1030 (struct sockaddr *)&mltaddr, 1031 (struct sockaddr *)&ia->ia_addr, 1032 (struct sockaddr *)&mltmask, 1033 RTF_UP|RTF_CLONING, /* xxx */ 1034 (struct rtentry **)0); 1035 (void)in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 1036 if (error != 0) { 1037 log(LOG_WARNING, 1038 "in6_update_ifa: addmulti failed for " 1039 "%s on %s (errno=%d)\n", 1040 ip6_sprintf(&mltaddr.sin6_addr), 1041 if_name(ifp), error); 1042 } 1043 } 1044 1045 /* 1046 * join node information group address 1047 */ 1048 #define hostnamelen strlen(hostname) 1049 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr.sin6_addr) 1050 == 0) { 1051 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1052 if (in6m == NULL && ia != NULL) { 1053 (void)in6_addmulti(&mltaddr.sin6_addr, 1054 ifp, &error); 1055 if (error != 0) { 1056 log(LOG_WARNING, "in6_update_ifa: " 1057 "addmulti failed for " 1058 "%s on %s (errno=%d)\n", 1059 ip6_sprintf(&mltaddr.sin6_addr), 1060 if_name(ifp), error); 1061 } 1062 } 1063 } 1064 #undef hostnamelen 1065 1066 /* 1067 * join node-local all-nodes address, on loopback. 1068 * XXX: since "node-local" is obsoleted by interface-local, 1069 * we have to join the group on every interface with 1070 * some interface-boundary restriction. 1071 */ 1072 if (ifp->if_flags & IFF_LOOPBACK) { 1073 struct in6_ifaddr *ia_loop; 1074 1075 struct in6_addr loop6 = in6addr_loopback; 1076 ia_loop = in6ifa_ifpwithaddr(ifp, &loop6); 1077 1078 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1079 1080 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1081 if (in6m == NULL && ia_loop != NULL) { 1082 rtrequest(RTM_ADD, 1083 (struct sockaddr *)&mltaddr, 1084 (struct sockaddr *)&ia_loop->ia_addr, 1085 (struct sockaddr *)&mltmask, 1086 RTF_UP, 1087 (struct rtentry **)0); 1088 (void)in6_addmulti(&mltaddr.sin6_addr, ifp, 1089 &error); 1090 if (error != 0) { 1091 log(LOG_WARNING, "in6_update_ifa: " 1092 "addmulti failed for %s on %s " 1093 "(errno=%d)\n", 1094 ip6_sprintf(&mltaddr.sin6_addr), 1095 if_name(ifp), error); 1096 } 1097 } 1098 } 1099 } 1100 1101 ia->ia6_flags = ifra->ifra_flags; 1102 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /*safety*/ 1103 ia->ia6_flags &= ~IN6_IFF_NODAD; /* Mobile IPv6 */ 1104 1105 ia->ia6_lifetime = ifra->ifra_lifetime; 1106 /* for sanity */ 1107 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1108 ia->ia6_lifetime.ia6t_expire = 1109 time_second + ia->ia6_lifetime.ia6t_vltime; 1110 } else 1111 ia->ia6_lifetime.ia6t_expire = 0; 1112 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1113 ia->ia6_lifetime.ia6t_preferred = 1114 time_second + ia->ia6_lifetime.ia6t_pltime; 1115 } else 1116 ia->ia6_lifetime.ia6t_preferred = 0; 1117 1118 /* 1119 * Perform DAD, if needed. 1120 * XXX It may be of use, if we can administratively 1121 * disable DAD. 1122 */ 1123 if (in6if_do_dad(ifp) && (ifra->ifra_flags & IN6_IFF_NODAD) == 0) { 1124 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1125 nd6_dad_start((struct ifaddr *)ia, NULL); 1126 } 1127 1128 return(error); 1129 1130 unlink: 1131 /* 1132 * XXX: if a change of an existing address failed, keep the entry 1133 * anyway. 1134 */ 1135 if (hostIsNew) 1136 in6_unlink_ifa(ia, ifp); 1137 return(error); 1138 } 1139 1140 void 1141 in6_purgeaddr(struct ifaddr *ifa) 1142 { 1143 struct ifnet *ifp = ifa->ifa_ifp; 1144 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1145 1146 /* stop DAD processing */ 1147 nd6_dad_stop(ifa); 1148 1149 /* 1150 * delete route to the destination of the address being purged. 1151 * The interface must be p2p or loopback in this case. 1152 */ 1153 if ((ia->ia_flags & IFA_ROUTE) != 0 && ia->ia_dstaddr.sin6_len != 0) { 1154 int e; 1155 1156 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 1157 != 0) { 1158 log(LOG_ERR, "in6_purgeaddr: failed to remove " 1159 "a route to the p2p destination: %s on %s, " 1160 "errno=%d\n", 1161 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp), 1162 e); 1163 /* proceed anyway... */ 1164 } 1165 else 1166 ia->ia_flags &= ~IFA_ROUTE; 1167 } 1168 1169 /* Remove ownaddr's loopback rtentry, if it exists. */ 1170 in6_ifremloop(&(ia->ia_ifa)); 1171 1172 if (ifp->if_flags & IFF_MULTICAST) { 1173 /* 1174 * delete solicited multicast addr for deleting host id 1175 */ 1176 struct in6_multi *in6m; 1177 struct in6_addr llsol; 1178 bzero(&llsol, sizeof(struct in6_addr)); 1179 llsol.s6_addr16[0] = htons(0xff02); 1180 llsol.s6_addr16[1] = htons(ifp->if_index); 1181 llsol.s6_addr32[1] = 0; 1182 llsol.s6_addr32[2] = htonl(1); 1183 llsol.s6_addr32[3] = 1184 ia->ia_addr.sin6_addr.s6_addr32[3]; 1185 llsol.s6_addr8[12] = 0xff; 1186 1187 IN6_LOOKUP_MULTI(llsol, ifp, in6m); 1188 if (in6m) 1189 in6_delmulti(in6m); 1190 } 1191 1192 in6_unlink_ifa(ia, ifp); 1193 } 1194 1195 static void 1196 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1197 { 1198 int plen, iilen; 1199 struct in6_ifaddr *oia; 1200 1201 crit_enter(); 1202 1203 TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list); 1204 1205 oia = ia; 1206 if (oia == (ia = in6_ifaddr)) 1207 in6_ifaddr = ia->ia_next; 1208 else { 1209 while (ia->ia_next && (ia->ia_next != oia)) 1210 ia = ia->ia_next; 1211 if (ia->ia_next) 1212 ia->ia_next = oia->ia_next; 1213 else { 1214 /* search failed */ 1215 printf("Couldn't unlink in6_ifaddr from in6_ifaddr\n"); 1216 } 1217 } 1218 1219 if (oia->ia6_ifpr) { /* check for safety */ 1220 plen = in6_mask2len(&oia->ia_prefixmask.sin6_addr, NULL); 1221 iilen = (sizeof(oia->ia_prefixmask.sin6_addr) << 3) - plen; 1222 in6_prefix_remove_ifid(iilen, oia); 1223 } 1224 1225 /* 1226 * When an autoconfigured address is being removed, release the 1227 * reference to the base prefix. Also, since the release might 1228 * affect the status of other (detached) addresses, call 1229 * pfxlist_onlink_check(). 1230 */ 1231 if ((oia->ia6_flags & IN6_IFF_AUTOCONF) != 0) { 1232 if (oia->ia6_ndpr == NULL) { 1233 log(LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address " 1234 "%p has no prefix\n", oia); 1235 } else { 1236 oia->ia6_ndpr->ndpr_refcnt--; 1237 oia->ia6_flags &= ~IN6_IFF_AUTOCONF; 1238 oia->ia6_ndpr = NULL; 1239 } 1240 1241 pfxlist_onlink_check(); 1242 } 1243 1244 /* 1245 * release another refcnt for the link from in6_ifaddr. 1246 * Note that we should decrement the refcnt at least once for all *BSD. 1247 */ 1248 IFAFREE(&oia->ia_ifa); 1249 1250 crit_exit(); 1251 } 1252 1253 void 1254 in6_purgeif(struct ifnet *ifp) 1255 { 1256 struct ifaddr *ifa, *nifa; 1257 1258 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa) 1259 { 1260 nifa = TAILQ_NEXT(ifa, ifa_list); 1261 if (ifa->ifa_addr->sa_family != AF_INET6) 1262 continue; 1263 in6_purgeaddr(ifa); 1264 } 1265 1266 in6_ifdetach(ifp); 1267 } 1268 1269 /* 1270 * SIOC[GAD]LIFADDR. 1271 * SIOCGLIFADDR: get first address. (?) 1272 * SIOCGLIFADDR with IFLR_PREFIX: 1273 * get first address that matches the specified prefix. 1274 * SIOCALIFADDR: add the specified address. 1275 * SIOCALIFADDR with IFLR_PREFIX: 1276 * add the specified prefix, filling hostid part from 1277 * the first link-local address. prefixlen must be <= 64. 1278 * SIOCDLIFADDR: delete the specified address. 1279 * SIOCDLIFADDR with IFLR_PREFIX: 1280 * delete the first address that matches the specified prefix. 1281 * return values: 1282 * EINVAL on invalid parameters 1283 * EADDRNOTAVAIL on prefix match failed/specified address not found 1284 * other values may be returned from in6_ioctl() 1285 * 1286 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1287 * this is to accomodate address naming scheme other than RFC2374, 1288 * in the future. 1289 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1290 * address encoding scheme. (see figure on page 8) 1291 */ 1292 static int 1293 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 1294 struct ifnet *ifp, struct thread *td) 1295 { 1296 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1297 struct ifaddr *ifa; 1298 struct sockaddr *sa; 1299 1300 /* sanity checks */ 1301 if (!data || !ifp) { 1302 panic("invalid argument to in6_lifaddr_ioctl"); 1303 /*NOTRECHED*/ 1304 } 1305 1306 switch (cmd) { 1307 case SIOCGLIFADDR: 1308 /* address must be specified on GET with IFLR_PREFIX */ 1309 if ((iflr->flags & IFLR_PREFIX) == 0) 1310 break; 1311 /* FALLTHROUGH */ 1312 case SIOCALIFADDR: 1313 case SIOCDLIFADDR: 1314 /* address must be specified on ADD and DELETE */ 1315 sa = (struct sockaddr *)&iflr->addr; 1316 if (sa->sa_family != AF_INET6) 1317 return EINVAL; 1318 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1319 return EINVAL; 1320 /* XXX need improvement */ 1321 sa = (struct sockaddr *)&iflr->dstaddr; 1322 if (sa->sa_family && sa->sa_family != AF_INET6) 1323 return EINVAL; 1324 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1325 return EINVAL; 1326 break; 1327 default: /* shouldn't happen */ 1328 #if 0 1329 panic("invalid cmd to in6_lifaddr_ioctl"); 1330 /* NOTREACHED */ 1331 #else 1332 return EOPNOTSUPP; 1333 #endif 1334 } 1335 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) 1336 return EINVAL; 1337 1338 switch (cmd) { 1339 case SIOCALIFADDR: 1340 { 1341 struct in6_aliasreq ifra; 1342 struct in6_addr *hostid = NULL; 1343 int prefixlen; 1344 1345 if ((iflr->flags & IFLR_PREFIX) != 0) { 1346 struct sockaddr_in6 *sin6; 1347 1348 /* 1349 * hostid is to fill in the hostid part of the 1350 * address. hostid points to the first link-local 1351 * address attached to the interface. 1352 */ 1353 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1354 if (!ifa) 1355 return EADDRNOTAVAIL; 1356 hostid = IFA_IN6(ifa); 1357 1358 /* prefixlen must be <= 64. */ 1359 if (64 < iflr->prefixlen) 1360 return EINVAL; 1361 prefixlen = iflr->prefixlen; 1362 1363 /* hostid part must be zero. */ 1364 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1365 if (sin6->sin6_addr.s6_addr32[2] != 0 1366 || sin6->sin6_addr.s6_addr32[3] != 0) { 1367 return EINVAL; 1368 } 1369 } else 1370 prefixlen = iflr->prefixlen; 1371 1372 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1373 bzero(&ifra, sizeof(ifra)); 1374 bcopy(iflr->iflr_name, ifra.ifra_name, 1375 sizeof(ifra.ifra_name)); 1376 1377 bcopy(&iflr->addr, &ifra.ifra_addr, 1378 ((struct sockaddr *)&iflr->addr)->sa_len); 1379 if (hostid) { 1380 /* fill in hostid part */ 1381 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1382 hostid->s6_addr32[2]; 1383 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1384 hostid->s6_addr32[3]; 1385 } 1386 1387 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/ 1388 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1389 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1390 if (hostid) { 1391 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1392 hostid->s6_addr32[2]; 1393 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1394 hostid->s6_addr32[3]; 1395 } 1396 } 1397 1398 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1399 in6_len2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1400 1401 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1402 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td); 1403 } 1404 case SIOCGLIFADDR: 1405 case SIOCDLIFADDR: 1406 { 1407 struct in6_ifaddr *ia; 1408 struct in6_addr mask, candidate, match; 1409 struct sockaddr_in6 *sin6; 1410 int cmp; 1411 1412 bzero(&mask, sizeof(mask)); 1413 if (iflr->flags & IFLR_PREFIX) { 1414 /* lookup a prefix rather than address. */ 1415 in6_len2mask(&mask, iflr->prefixlen); 1416 1417 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1418 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1419 match.s6_addr32[0] &= mask.s6_addr32[0]; 1420 match.s6_addr32[1] &= mask.s6_addr32[1]; 1421 match.s6_addr32[2] &= mask.s6_addr32[2]; 1422 match.s6_addr32[3] &= mask.s6_addr32[3]; 1423 1424 /* if you set extra bits, that's wrong */ 1425 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1426 return EINVAL; 1427 1428 cmp = 1; 1429 } else { 1430 if (cmd == SIOCGLIFADDR) { 1431 /* on getting an address, take the 1st match */ 1432 cmp = 0; /* XXX */ 1433 } else { 1434 /* on deleting an address, do exact match */ 1435 in6_len2mask(&mask, 128); 1436 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1437 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1438 1439 cmp = 1; 1440 } 1441 } 1442 1443 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1444 { 1445 if (ifa->ifa_addr->sa_family != AF_INET6) 1446 continue; 1447 if (!cmp) 1448 break; 1449 1450 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1451 /* 1452 * XXX: this is adhoc, but is necessary to allow 1453 * a user to specify fe80::/64 (not /10) for a 1454 * link-local address. 1455 */ 1456 if (IN6_IS_ADDR_LINKLOCAL(&candidate)) 1457 candidate.s6_addr16[1] = 0; 1458 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1459 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1460 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1461 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1462 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1463 break; 1464 } 1465 if (!ifa) 1466 return EADDRNOTAVAIL; 1467 ia = ifa2ia6(ifa); 1468 1469 if (cmd == SIOCGLIFADDR) { 1470 struct sockaddr_in6 *s6; 1471 1472 /* fill in the if_laddrreq structure */ 1473 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1474 s6 = (struct sockaddr_in6 *)&iflr->addr; 1475 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) { 1476 s6->sin6_addr.s6_addr16[1] = 0; 1477 s6->sin6_scope_id = 1478 in6_addr2scopeid(ifp, &s6->sin6_addr); 1479 } 1480 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1481 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1482 ia->ia_dstaddr.sin6_len); 1483 s6 = (struct sockaddr_in6 *)&iflr->dstaddr; 1484 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) { 1485 s6->sin6_addr.s6_addr16[1] = 0; 1486 s6->sin6_scope_id = 1487 in6_addr2scopeid(ifp, 1488 &s6->sin6_addr); 1489 } 1490 } else 1491 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1492 1493 iflr->prefixlen = 1494 in6_mask2len(&ia->ia_prefixmask.sin6_addr, 1495 NULL); 1496 1497 iflr->flags = ia->ia6_flags; /* XXX */ 1498 1499 return 0; 1500 } else { 1501 struct in6_aliasreq ifra; 1502 1503 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1504 bzero(&ifra, sizeof(ifra)); 1505 bcopy(iflr->iflr_name, ifra.ifra_name, 1506 sizeof(ifra.ifra_name)); 1507 1508 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1509 ia->ia_addr.sin6_len); 1510 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1511 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1512 ia->ia_dstaddr.sin6_len); 1513 } else { 1514 bzero(&ifra.ifra_dstaddr, 1515 sizeof(ifra.ifra_dstaddr)); 1516 } 1517 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1518 ia->ia_prefixmask.sin6_len); 1519 1520 ifra.ifra_flags = ia->ia6_flags; 1521 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, 1522 ifp, td); 1523 } 1524 } 1525 } 1526 1527 return EOPNOTSUPP; /* just for safety */ 1528 } 1529 1530 /* 1531 * Initialize an interface's intetnet6 address 1532 * and routing table entry. 1533 */ 1534 static int 1535 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, struct sockaddr_in6 *sin6, 1536 int newhost) 1537 { 1538 int error = 0, plen, ifacount = 0; 1539 struct ifaddr *ifa; 1540 1541 crit_enter(); 1542 1543 /* 1544 * Give the interface a chance to initialize 1545 * if this is its first address, 1546 * and to validate the address if necessary. 1547 */ 1548 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1549 { 1550 if (ifa->ifa_addr == NULL) 1551 continue; /* just for safety */ 1552 if (ifa->ifa_addr->sa_family != AF_INET6) 1553 continue; 1554 ifacount++; 1555 } 1556 1557 ia->ia_addr = *sin6; 1558 1559 if (ifacount <= 1 && ifp->if_ioctl && 1560 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia, 1561 (struct ucred *)NULL))) { 1562 crit_exit(); 1563 return(error); 1564 } 1565 crit_exit(); 1566 1567 ia->ia_ifa.ifa_metric = ifp->if_metric; 1568 1569 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1570 1571 /* 1572 * Special case: 1573 * If the destination address is specified for a point-to-point 1574 * interface, install a route to the destination as an interface 1575 * direct route. 1576 */ 1577 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1578 if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) { 1579 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, 1580 RTF_UP | RTF_HOST)) != 0) 1581 return(error); 1582 ia->ia_flags |= IFA_ROUTE; 1583 } 1584 if (plen < 128) { 1585 /* 1586 * The RTF_CLONING flag is necessary for in6_is_ifloop_auto(). 1587 */ 1588 ia->ia_ifa.ifa_flags |= RTF_CLONING; 1589 } 1590 1591 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1592 if (newhost) { 1593 /* set the rtrequest function to create llinfo */ 1594 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1595 in6_ifaddloop(&(ia->ia_ifa)); 1596 } 1597 1598 return(error); 1599 } 1600 1601 /* 1602 * Add an address to the list of IP6 multicast addresses for a 1603 * given interface. 1604 */ 1605 struct in6_multi * 1606 in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp, int *errorp) 1607 { 1608 struct in6_multi *in6m; 1609 struct sockaddr_in6 sin6; 1610 struct ifmultiaddr *ifma; 1611 1612 *errorp = 0; 1613 1614 crit_enter(); 1615 1616 /* 1617 * Call generic routine to add membership or increment 1618 * refcount. It wants addresses in the form of a sockaddr, 1619 * so we build one here (being careful to zero the unused bytes). 1620 */ 1621 bzero(&sin6, sizeof sin6); 1622 sin6.sin6_family = AF_INET6; 1623 sin6.sin6_len = sizeof sin6; 1624 sin6.sin6_addr = *maddr6; 1625 *errorp = if_addmulti(ifp, (struct sockaddr *)&sin6, &ifma); 1626 if (*errorp) { 1627 crit_exit(); 1628 return 0; 1629 } 1630 1631 /* 1632 * If ifma->ifma_protospec is null, then if_addmulti() created 1633 * a new record. Otherwise, we are done. 1634 */ 1635 if (ifma->ifma_protospec != 0) { 1636 crit_exit(); 1637 return ifma->ifma_protospec; 1638 } 1639 1640 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 1641 at interrupt time? If so, need to fix if_addmulti. XXX */ 1642 in6m = (struct in6_multi *)malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT); 1643 if (in6m == NULL) { 1644 crit_exit(); 1645 return (NULL); 1646 } 1647 1648 bzero(in6m, sizeof *in6m); 1649 in6m->in6m_addr = *maddr6; 1650 in6m->in6m_ifp = ifp; 1651 in6m->in6m_ifma = ifma; 1652 ifma->ifma_protospec = in6m; 1653 LIST_INSERT_HEAD(&in6_multihead, in6m, in6m_entry); 1654 1655 /* 1656 * Let MLD6 know that we have joined a new IP6 multicast 1657 * group. 1658 */ 1659 mld6_start_listening(in6m); 1660 crit_exit(); 1661 return(in6m); 1662 } 1663 1664 /* 1665 * Delete a multicast address record. 1666 */ 1667 void 1668 in6_delmulti(struct in6_multi *in6m) 1669 { 1670 struct ifmultiaddr *ifma = in6m->in6m_ifma; 1671 1672 crit_enter(); 1673 1674 if (ifma->ifma_refcount == 1) { 1675 /* 1676 * No remaining claims to this record; let MLD6 know 1677 * that we are leaving the multicast group. 1678 */ 1679 mld6_stop_listening(in6m); 1680 ifma->ifma_protospec = 0; 1681 LIST_REMOVE(in6m, in6m_entry); 1682 free(in6m, M_IPMADDR); 1683 } 1684 /* XXX - should be separate API for when we have an ifma? */ 1685 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1686 crit_exit(); 1687 } 1688 1689 /* 1690 * Find an IPv6 interface link-local address specific to an interface. 1691 */ 1692 struct in6_ifaddr * 1693 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1694 { 1695 struct ifaddr *ifa; 1696 1697 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1698 { 1699 if (ifa->ifa_addr == NULL) 1700 continue; /* just for safety */ 1701 if (ifa->ifa_addr->sa_family != AF_INET6) 1702 continue; 1703 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1704 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1705 ignoreflags) != 0) 1706 continue; 1707 break; 1708 } 1709 } 1710 1711 return((struct in6_ifaddr *)ifa); 1712 } 1713 1714 1715 /* 1716 * find the internet address corresponding to a given interface and address. 1717 */ 1718 struct in6_ifaddr * 1719 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr) 1720 { 1721 struct ifaddr *ifa; 1722 1723 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1724 { 1725 if (ifa->ifa_addr == NULL) 1726 continue; /* just for safety */ 1727 if (ifa->ifa_addr->sa_family != AF_INET6) 1728 continue; 1729 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1730 break; 1731 } 1732 1733 return((struct in6_ifaddr *)ifa); 1734 } 1735 1736 /* 1737 * Convert IP6 address to printable (loggable) representation. 1738 */ 1739 static char digits[] = "0123456789abcdef"; 1740 static int ip6round = 0; 1741 char * 1742 ip6_sprintf(const struct in6_addr *addr) 1743 { 1744 static char ip6buf[8][48]; 1745 int i; 1746 char *cp; 1747 const u_short *a = (const u_short *)addr; 1748 const u_char *d; 1749 int dcolon = 0; 1750 1751 ip6round = (ip6round + 1) & 7; 1752 cp = ip6buf[ip6round]; 1753 1754 for (i = 0; i < 8; i++) { 1755 if (dcolon == 1) { 1756 if (*a == 0) { 1757 if (i == 7) 1758 *cp++ = ':'; 1759 a++; 1760 continue; 1761 } else 1762 dcolon = 2; 1763 } 1764 if (*a == 0) { 1765 if (dcolon == 0 && *(a + 1) == 0) { 1766 if (i == 0) 1767 *cp++ = ':'; 1768 *cp++ = ':'; 1769 dcolon = 1; 1770 } else { 1771 *cp++ = '0'; 1772 *cp++ = ':'; 1773 } 1774 a++; 1775 continue; 1776 } 1777 d = (const u_char *)a; 1778 *cp++ = digits[*d >> 4]; 1779 *cp++ = digits[*d++ & 0xf]; 1780 *cp++ = digits[*d >> 4]; 1781 *cp++ = digits[*d & 0xf]; 1782 *cp++ = ':'; 1783 a++; 1784 } 1785 *--cp = 0; 1786 return(ip6buf[ip6round]); 1787 } 1788 1789 int 1790 in6_localaddr(struct in6_addr *in6) 1791 { 1792 struct in6_ifaddr *ia; 1793 1794 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1795 return 1; 1796 1797 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 1798 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1799 &ia->ia_prefixmask.sin6_addr)) 1800 return 1; 1801 1802 return (0); 1803 } 1804 1805 int 1806 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1807 { 1808 struct in6_ifaddr *ia; 1809 1810 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1811 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1812 &sa6->sin6_addr) && 1813 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) 1814 return(1); /* true */ 1815 1816 /* XXX: do we still have to go thru the rest of the list? */ 1817 } 1818 1819 return(0); /* false */ 1820 } 1821 1822 /* 1823 * return length of part which dst and src are equal 1824 * hard coding... 1825 */ 1826 int 1827 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1828 { 1829 int match = 0; 1830 u_char *s = (u_char *)src, *d = (u_char *)dst; 1831 u_char *lim = s + 16, r; 1832 1833 while (s < lim) 1834 if ((r = (*d++ ^ *s++)) != 0) { 1835 while (r < 128) { 1836 match++; 1837 r <<= 1; 1838 } 1839 break; 1840 } else 1841 match += 8; 1842 return match; 1843 } 1844 1845 /* XXX: to be scope conscious */ 1846 int 1847 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1848 { 1849 int bytelen, bitlen; 1850 1851 /* sanity check */ 1852 if (0 > len || len > 128) { 1853 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1854 len); 1855 return(0); 1856 } 1857 1858 bytelen = len / 8; 1859 bitlen = len % 8; 1860 1861 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1862 return(0); 1863 if (p1->s6_addr[bytelen] >> (8 - bitlen) != 1864 p2->s6_addr[bytelen] >> (8 - bitlen)) 1865 return(0); 1866 1867 return(1); 1868 } 1869 1870 void 1871 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1872 { 1873 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1874 int bytelen, bitlen, i; 1875 1876 /* sanity check */ 1877 if (0 > len || len > 128) { 1878 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1879 len); 1880 return; 1881 } 1882 1883 bzero(maskp, sizeof(*maskp)); 1884 bytelen = len / 8; 1885 bitlen = len % 8; 1886 for (i = 0; i < bytelen; i++) 1887 maskp->s6_addr[i] = 0xff; 1888 if (bitlen) 1889 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1890 } 1891 1892 /* 1893 * return the best address out of the same scope 1894 */ 1895 struct in6_ifaddr * 1896 in6_ifawithscope(struct ifnet *oifp, struct in6_addr *dst) 1897 { 1898 int dst_scope = in6_addrscope(dst), src_scope, best_scope = 0; 1899 int blen = -1; 1900 struct ifaddr *ifa; 1901 struct ifnet *ifp; 1902 struct in6_ifaddr *ifa_best = NULL; 1903 1904 if (oifp == NULL) { 1905 #if 0 1906 printf("in6_ifawithscope: output interface is not specified\n"); 1907 #endif 1908 return(NULL); 1909 } 1910 1911 /* 1912 * We search for all addresses on all interfaces from the beginning. 1913 * Comparing an interface with the outgoing interface will be done 1914 * only at the final stage of tiebreaking. 1915 */ 1916 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1917 { 1918 /* 1919 * We can never take an address that breaks the scope zone 1920 * of the destination. 1921 */ 1922 if (in6_addr2scopeid(ifp, dst) != in6_addr2scopeid(oifp, dst)) 1923 continue; 1924 1925 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1926 { 1927 int tlen = -1, dscopecmp, bscopecmp, matchcmp; 1928 1929 if (ifa->ifa_addr->sa_family != AF_INET6) 1930 continue; 1931 1932 src_scope = in6_addrscope(IFA_IN6(ifa)); 1933 1934 /* 1935 * Don't use an address before completing DAD 1936 * nor a duplicated address. 1937 */ 1938 if (((struct in6_ifaddr *)ifa)->ia6_flags & 1939 IN6_IFF_NOTREADY) 1940 continue; 1941 1942 /* XXX: is there any case to allow anycasts? */ 1943 if (((struct in6_ifaddr *)ifa)->ia6_flags & 1944 IN6_IFF_ANYCAST) 1945 continue; 1946 1947 if (((struct in6_ifaddr *)ifa)->ia6_flags & 1948 IN6_IFF_DETACHED) 1949 continue; 1950 1951 /* 1952 * If this is the first address we find, 1953 * keep it anyway. 1954 */ 1955 if (ifa_best == NULL) 1956 goto replace; 1957 1958 /* 1959 * ifa_best is never NULL beyond this line except 1960 * within the block labeled "replace". 1961 */ 1962 1963 /* 1964 * If ifa_best has a smaller scope than dst and 1965 * the current address has a larger one than 1966 * (or equal to) dst, always replace ifa_best. 1967 * Also, if the current address has a smaller scope 1968 * than dst, ignore it unless ifa_best also has a 1969 * smaller scope. 1970 * Consequently, after the two if-clause below, 1971 * the followings must be satisfied: 1972 * (scope(src) < scope(dst) && 1973 * scope(best) < scope(dst)) 1974 * OR 1975 * (scope(best) >= scope(dst) && 1976 * scope(src) >= scope(dst)) 1977 */ 1978 if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0 && 1979 IN6_ARE_SCOPE_CMP(src_scope, dst_scope) >= 0) 1980 goto replace; /* (A) */ 1981 if (IN6_ARE_SCOPE_CMP(src_scope, dst_scope) < 0 && 1982 IN6_ARE_SCOPE_CMP(best_scope, dst_scope) >= 0) 1983 continue; /* (B) */ 1984 1985 /* 1986 * A deprecated address SHOULD NOT be used in new 1987 * communications if an alternate (non-deprecated) 1988 * address is available and has sufficient scope. 1989 * RFC 2462, Section 5.5.4. 1990 */ 1991 if (((struct in6_ifaddr *)ifa)->ia6_flags & 1992 IN6_IFF_DEPRECATED) { 1993 /* 1994 * Ignore any deprecated addresses if 1995 * specified by configuration. 1996 */ 1997 if (!ip6_use_deprecated) 1998 continue; 1999 2000 /* 2001 * If we have already found a non-deprecated 2002 * candidate, just ignore deprecated addresses. 2003 */ 2004 if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) 2005 == 0) 2006 continue; 2007 } 2008 2009 /* 2010 * A non-deprecated address is always preferred 2011 * to a deprecated one regardless of scopes and 2012 * address matching (Note invariants ensured by the 2013 * conditions (A) and (B) above.) 2014 */ 2015 if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) && 2016 (((struct in6_ifaddr *)ifa)->ia6_flags & 2017 IN6_IFF_DEPRECATED) == 0) 2018 goto replace; 2019 2020 /* 2021 * When we use temporary addresses described in 2022 * RFC 3041, we prefer temporary addresses to 2023 * public autoconf addresses. Again, note the 2024 * invariants from (A) and (B). Also note that we 2025 * don't have any preference between static addresses 2026 * and autoconf addresses (despite of whether or not 2027 * the latter is temporary or public.) 2028 */ 2029 if (ip6_use_tempaddr) { 2030 struct in6_ifaddr *ifat; 2031 2032 ifat = (struct in6_ifaddr *)ifa; 2033 if ((ifa_best->ia6_flags & 2034 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2035 == IN6_IFF_AUTOCONF && 2036 (ifat->ia6_flags & 2037 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2038 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) { 2039 goto replace; 2040 } 2041 if ((ifa_best->ia6_flags & 2042 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2043 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY) && 2044 (ifat->ia6_flags & 2045 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2046 == IN6_IFF_AUTOCONF) { 2047 continue; 2048 } 2049 } 2050 2051 /* 2052 * At this point, we have two cases: 2053 * 1. we are looking at a non-deprecated address, 2054 * and ifa_best is also non-deprecated. 2055 * 2. we are looking at a deprecated address, 2056 * and ifa_best is also deprecated. 2057 * Also, we do not have to consider a case where 2058 * the scope of if_best is larger(smaller) than dst and 2059 * the scope of the current address is smaller(larger) 2060 * than dst. Such a case has already been covered. 2061 * Tiebreaking is done according to the following 2062 * items: 2063 * - the scope comparison between the address and 2064 * dst (dscopecmp) 2065 * - the scope comparison between the address and 2066 * ifa_best (bscopecmp) 2067 * - if the address match dst longer than ifa_best 2068 * (matchcmp) 2069 * - if the address is on the outgoing I/F (outI/F) 2070 * 2071 * Roughly speaking, the selection policy is 2072 * - the most important item is scope. The same scope 2073 * is best. Then search for a larger scope. 2074 * Smaller scopes are the last resort. 2075 * - A deprecated address is chosen only when we have 2076 * no address that has an enough scope, but is 2077 * prefered to any addresses of smaller scopes 2078 * (this must be already done above.) 2079 * - addresses on the outgoing I/F are preferred to 2080 * ones on other interfaces if none of above 2081 * tiebreaks. In the table below, the column "bI" 2082 * means if the best_ifa is on the outgoing 2083 * interface, and the column "sI" means if the ifa 2084 * is on the outgoing interface. 2085 * - If there is no other reasons to choose one, 2086 * longest address match against dst is considered. 2087 * 2088 * The precise decision table is as follows: 2089 * dscopecmp bscopecmp match bI oI | replace? 2090 * N/A equal N/A Y N | No (1) 2091 * N/A equal N/A N Y | Yes (2) 2092 * N/A equal larger N/A | Yes (3) 2093 * N/A equal !larger N/A | No (4) 2094 * larger larger N/A N/A | No (5) 2095 * larger smaller N/A N/A | Yes (6) 2096 * smaller larger N/A N/A | Yes (7) 2097 * smaller smaller N/A N/A | No (8) 2098 * equal smaller N/A N/A | Yes (9) 2099 * equal larger (already done at A above) 2100 */ 2101 dscopecmp = IN6_ARE_SCOPE_CMP(src_scope, dst_scope); 2102 bscopecmp = IN6_ARE_SCOPE_CMP(src_scope, best_scope); 2103 2104 if (bscopecmp == 0) { 2105 struct ifnet *bifp = ifa_best->ia_ifp; 2106 2107 if (bifp == oifp && ifp != oifp) /* (1) */ 2108 continue; 2109 if (bifp != oifp && ifp == oifp) /* (2) */ 2110 goto replace; 2111 2112 /* 2113 * Both bifp and ifp are on the outgoing 2114 * interface, or both two are on a different 2115 * interface from the outgoing I/F. 2116 * now we need address matching against dst 2117 * for tiebreaking. 2118 */ 2119 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2120 matchcmp = tlen - blen; 2121 if (matchcmp > 0) /* (3) */ 2122 goto replace; 2123 continue; /* (4) */ 2124 } 2125 if (dscopecmp > 0) { 2126 if (bscopecmp > 0) /* (5) */ 2127 continue; 2128 goto replace; /* (6) */ 2129 } 2130 if (dscopecmp < 0) { 2131 if (bscopecmp > 0) /* (7) */ 2132 goto replace; 2133 continue; /* (8) */ 2134 } 2135 2136 /* now dscopecmp must be 0 */ 2137 if (bscopecmp < 0) 2138 goto replace; /* (9) */ 2139 2140 replace: 2141 ifa_best = (struct in6_ifaddr *)ifa; 2142 blen = tlen >= 0 ? tlen : 2143 in6_matchlen(IFA_IN6(ifa), dst); 2144 best_scope = in6_addrscope(&ifa_best->ia_addr.sin6_addr); 2145 } 2146 } 2147 2148 /* count statistics for future improvements */ 2149 if (ifa_best == NULL) 2150 ip6stat.ip6s_sources_none++; 2151 else { 2152 if (oifp == ifa_best->ia_ifp) 2153 ip6stat.ip6s_sources_sameif[best_scope]++; 2154 else 2155 ip6stat.ip6s_sources_otherif[best_scope]++; 2156 2157 if (best_scope == dst_scope) 2158 ip6stat.ip6s_sources_samescope[best_scope]++; 2159 else 2160 ip6stat.ip6s_sources_otherscope[best_scope]++; 2161 2162 if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) != 0) 2163 ip6stat.ip6s_sources_deprecated[best_scope]++; 2164 } 2165 2166 return(ifa_best); 2167 } 2168 2169 /* 2170 * return the best address out of the same scope. if no address was 2171 * found, return the first valid address from designated IF. 2172 */ 2173 struct in6_ifaddr * 2174 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2175 { 2176 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2177 struct ifaddr *ifa; 2178 struct in6_ifaddr *besta = 0; 2179 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2180 2181 dep[0] = dep[1] = NULL; 2182 2183 /* 2184 * We first look for addresses in the same scope. 2185 * If there is one, return it. 2186 * If two or more, return one which matches the dst longest. 2187 * If none, return one of global addresses assigned other ifs. 2188 */ 2189 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 2190 { 2191 if (ifa->ifa_addr->sa_family != AF_INET6) 2192 continue; 2193 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2194 continue; /* XXX: is there any case to allow anycast? */ 2195 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2196 continue; /* don't use this interface */ 2197 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2198 continue; 2199 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2200 if (ip6_use_deprecated) 2201 dep[0] = (struct in6_ifaddr *)ifa; 2202 continue; 2203 } 2204 2205 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2206 /* 2207 * call in6_matchlen() as few as possible 2208 */ 2209 if (besta) { 2210 if (blen == -1) 2211 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2212 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2213 if (tlen > blen) { 2214 blen = tlen; 2215 besta = (struct in6_ifaddr *)ifa; 2216 } 2217 } else 2218 besta = (struct in6_ifaddr *)ifa; 2219 } 2220 } 2221 if (besta) 2222 return(besta); 2223 2224 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 2225 { 2226 if (ifa->ifa_addr->sa_family != AF_INET6) 2227 continue; 2228 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2229 continue; /* XXX: is there any case to allow anycast? */ 2230 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2231 continue; /* don't use this interface */ 2232 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2233 continue; 2234 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2235 if (ip6_use_deprecated) 2236 dep[1] = (struct in6_ifaddr *)ifa; 2237 continue; 2238 } 2239 2240 return (struct in6_ifaddr *)ifa; 2241 } 2242 2243 /* use the last-resort values, that are, deprecated addresses */ 2244 if (dep[0]) 2245 return dep[0]; 2246 if (dep[1]) 2247 return dep[1]; 2248 2249 return NULL; 2250 } 2251 2252 /* 2253 * perform DAD when interface becomes IFF_UP. 2254 */ 2255 void 2256 in6_if_up(struct ifnet *ifp) 2257 { 2258 struct ifaddr *ifa; 2259 struct in6_ifaddr *ia; 2260 int dad_delay; /* delay ticks before DAD output */ 2261 2262 /* 2263 * special cases, like 6to4, are handled in in6_ifattach 2264 */ 2265 in6_ifattach(ifp, NULL); 2266 2267 dad_delay = 0; 2268 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 2269 { 2270 if (ifa->ifa_addr->sa_family != AF_INET6) 2271 continue; 2272 ia = (struct in6_ifaddr *)ifa; 2273 if (ia->ia6_flags & IN6_IFF_TENTATIVE) 2274 nd6_dad_start(ifa, &dad_delay); 2275 } 2276 } 2277 2278 int 2279 in6if_do_dad(struct ifnet *ifp) 2280 { 2281 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 2282 return(0); 2283 2284 switch (ifp->if_type) { 2285 #ifdef IFT_DUMMY 2286 case IFT_DUMMY: 2287 #endif 2288 case IFT_FAITH: 2289 /* 2290 * These interfaces do not have the IFF_LOOPBACK flag, 2291 * but loop packets back. We do not have to do DAD on such 2292 * interfaces. We should even omit it, because loop-backed 2293 * NS would confuse the DAD procedure. 2294 */ 2295 return(0); 2296 default: 2297 /* 2298 * Our DAD routine requires the interface up and running. 2299 * However, some interfaces can be up before the RUNNING 2300 * status. Additionaly, users may try to assign addresses 2301 * before the interface becomes up (or running). 2302 * We simply skip DAD in such a case as a work around. 2303 * XXX: we should rather mark "tentative" on such addresses, 2304 * and do DAD after the interface becomes ready. 2305 */ 2306 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != 2307 (IFF_UP|IFF_RUNNING)) 2308 return(0); 2309 2310 return(1); 2311 } 2312 } 2313 2314 /* 2315 * Calculate max IPv6 MTU through all the interfaces and store it 2316 * to in6_maxmtu. 2317 */ 2318 void 2319 in6_setmaxmtu(void) 2320 { 2321 unsigned long maxmtu = 0; 2322 struct ifnet *ifp; 2323 2324 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 2325 { 2326 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2327 ND_IFINFO(ifp)->linkmtu > maxmtu) 2328 maxmtu = ND_IFINFO(ifp)->linkmtu; 2329 } 2330 if (maxmtu) /* update only when maxmtu is positive */ 2331 in6_maxmtu = maxmtu; 2332 } 2333 2334 void * 2335 in6_domifattach(struct ifnet *ifp) 2336 { 2337 struct in6_ifextra *ext; 2338 2339 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2340 bzero(ext, sizeof(*ext)); 2341 2342 ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat), 2343 M_IFADDR, M_WAITOK); 2344 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat)); 2345 2346 ext->icmp6_ifstat = 2347 (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat), 2348 M_IFADDR, M_WAITOK); 2349 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat)); 2350 2351 ext->nd_ifinfo = nd6_ifattach(ifp); 2352 ext->scope6_id = scope6_ifattach(ifp); 2353 return ext; 2354 } 2355 2356 void 2357 in6_domifdetach(struct ifnet *ifp, void *aux) 2358 { 2359 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2360 scope6_ifdetach(ext->scope6_id); 2361 nd6_ifdetach(ext->nd_ifinfo); 2362 free(ext->in6_ifstat, M_IFADDR); 2363 free(ext->icmp6_ifstat, M_IFADDR); 2364 free(ext, M_IFADDR); 2365 } 2366 2367 /* 2368 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2369 * v4 mapped addr or v4 compat addr 2370 */ 2371 void 2372 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2373 { 2374 bzero(sin, sizeof(*sin)); 2375 sin->sin_len = sizeof(struct sockaddr_in); 2376 sin->sin_family = AF_INET; 2377 sin->sin_port = sin6->sin6_port; 2378 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2379 } 2380 2381 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2382 void 2383 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2384 { 2385 bzero(sin6, sizeof(*sin6)); 2386 sin6->sin6_len = sizeof(struct sockaddr_in6); 2387 sin6->sin6_family = AF_INET6; 2388 sin6->sin6_port = sin->sin_port; 2389 sin6->sin6_addr.s6_addr32[0] = 0; 2390 sin6->sin6_addr.s6_addr32[1] = 0; 2391 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2392 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2393 } 2394 2395 /* Convert sockaddr_in6 into sockaddr_in. */ 2396 void 2397 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2398 { 2399 struct sockaddr_in *sin_p; 2400 struct sockaddr_in6 sin6; 2401 2402 /* 2403 * Save original sockaddr_in6 addr and convert it 2404 * to sockaddr_in. 2405 */ 2406 sin6 = *(struct sockaddr_in6 *)nam; 2407 sin_p = (struct sockaddr_in *)nam; 2408 in6_sin6_2_sin(sin_p, &sin6); 2409 } 2410 2411 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2412 void 2413 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2414 { 2415 struct sockaddr_in *sin_p; 2416 struct sockaddr_in6 *sin6_p; 2417 2418 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 2419 M_WAITOK); 2420 sin_p = (struct sockaddr_in *)*nam; 2421 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2422 FREE(*nam, M_SONAME); 2423 *nam = (struct sockaddr *)sin6_p; 2424 } 2425