1 /* $FreeBSD$ */ 2 /* $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1991, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)in.c 8.2 (Berkeley) 11/15/93 66 */ 67 68 #include "opt_inet.h" 69 #include "opt_inet6.h" 70 71 #include <sys/param.h> 72 #include <sys/errno.h> 73 #include <sys/malloc.h> 74 #include <sys/socket.h> 75 #include <sys/socketvar.h> 76 #include <sys/sockio.h> 77 #include <sys/systm.h> 78 #include <sys/proc.h> 79 #include <sys/time.h> 80 #include <sys/kernel.h> 81 #include <sys/syslog.h> 82 83 #include <net/if.h> 84 #include <net/if_types.h> 85 #include <net/route.h> 86 #include <net/if_dl.h> 87 88 #include <netinet/in.h> 89 #include <netinet/in_var.h> 90 #include <netinet/if_ether.h> 91 #include <netinet/in_systm.h> 92 #include <netinet/ip.h> 93 #include <netinet/in_pcb.h> 94 95 #include <netinet/ip6.h> 96 #include <netinet6/ip6_var.h> 97 #include <netinet6/nd6.h> 98 #include <netinet6/mld6_var.h> 99 #include <netinet6/ip6_mroute.h> 100 #include <netinet6/in6_ifattach.h> 101 #include <netinet6/scope6_var.h> 102 #include <netinet6/in6_pcb.h> 103 104 #include <net/net_osdep.h> 105 106 MALLOC_DEFINE(M_IPMADDR, "in6_multi", "internet multicast address"); 107 108 /* 109 * Definitions of some costant IP6 addresses. 110 */ 111 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 112 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 113 const struct in6_addr in6addr_nodelocal_allnodes = 114 IN6ADDR_NODELOCAL_ALLNODES_INIT; 115 const struct in6_addr in6addr_linklocal_allnodes = 116 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 117 const struct in6_addr in6addr_linklocal_allrouters = 118 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 119 120 const struct in6_addr in6mask0 = IN6MASK0; 121 const struct in6_addr in6mask32 = IN6MASK32; 122 const struct in6_addr in6mask64 = IN6MASK64; 123 const struct in6_addr in6mask96 = IN6MASK96; 124 const struct in6_addr in6mask128 = IN6MASK128; 125 126 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6, 127 0, 0, IN6ADDR_ANY_INIT, 0}; 128 129 static int in6_lifaddr_ioctl __P((struct socket *, u_long, caddr_t, 130 struct ifnet *, struct thread *)); 131 static int in6_ifinit __P((struct ifnet *, struct in6_ifaddr *, 132 struct sockaddr_in6 *, int)); 133 static void in6_unlink_ifa __P((struct in6_ifaddr *, struct ifnet *)); 134 135 struct in6_multihead in6_multihead; /* XXX BSS initialization */ 136 int (*faithprefix_p)(struct in6_addr *); 137 138 /* 139 * Subroutine for in6_ifaddloop() and in6_ifremloop(). 140 * This routine does actual work. 141 */ 142 static void 143 in6_ifloop_request(int cmd, struct ifaddr *ifa) 144 { 145 struct sockaddr_in6 all1_sa; 146 struct rtentry *nrt = NULL; 147 int e; 148 149 bzero(&all1_sa, sizeof(all1_sa)); 150 all1_sa.sin6_family = AF_INET6; 151 all1_sa.sin6_len = sizeof(struct sockaddr_in6); 152 all1_sa.sin6_addr = in6mask128; 153 154 /* 155 * We specify the address itself as the gateway, and set the 156 * RTF_LLINFO flag, so that the corresponding host route would have 157 * the flag, and thus applications that assume traditional behavior 158 * would be happy. Note that we assume the caller of the function 159 * (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest, 160 * which changes the outgoing interface to the loopback interface. 161 */ 162 e = rtrequest(cmd, ifa->ifa_addr, ifa->ifa_addr, 163 (struct sockaddr *)&all1_sa, RTF_UP|RTF_HOST|RTF_LLINFO, &nrt); 164 if (e != 0) { 165 /* XXX need more descriptive message */ 166 log(LOG_ERR, "in6_ifloop_request: " 167 "%s operation failed for %s (errno=%d)\n", 168 cmd == RTM_ADD ? "ADD" : "DELETE", 169 ip6_sprintf(&((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr), 170 e); 171 } 172 173 if (nrt) { 174 RT_LOCK(nrt); 175 /* 176 * Make sure rt_ifa be equal to IFA, the second argument of 177 * the function. We need this because when we refer to 178 * rt_ifa->ia6_flags in ip6_input, we assume that the rt_ifa 179 * points to the address instead of the loopback address. 180 */ 181 if (cmd == RTM_ADD && ifa != nrt->rt_ifa) { 182 IFAFREE(nrt->rt_ifa); 183 IFAREF(ifa); 184 nrt->rt_ifa = ifa; 185 } 186 187 /* 188 * Report the addition/removal of the address to the routing 189 * socket. 190 * 191 * XXX: since we called rtinit for a p2p interface with a 192 * destination, we end up reporting twice in such a case. 193 * Should we rather omit the second report? 194 */ 195 rt_newaddrmsg(cmd, ifa, e, nrt); 196 if (cmd == RTM_DELETE) { 197 rtfree(nrt); 198 } else { 199 /* the cmd must be RTM_ADD here */ 200 nrt->rt_refcnt--; 201 RT_UNLOCK(nrt); 202 } 203 } 204 } 205 206 /* 207 * Add ownaddr as loopback rtentry. We previously add the route only if 208 * necessary (ex. on a p2p link). However, since we now manage addresses 209 * separately from prefixes, we should always add the route. We can't 210 * rely on the cloning mechanism from the corresponding interface route 211 * any more. 212 */ 213 static void 214 in6_ifaddloop(struct ifaddr *ifa) 215 { 216 struct rtentry *rt; 217 int need_loop; 218 219 /* If there is no loopback entry, allocate one. */ 220 rt = rtalloc1(ifa->ifa_addr, 0, 0); 221 need_loop = (rt == NULL || (rt->rt_flags & RTF_HOST) == 0 || 222 (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0); 223 if (rt) 224 rtfree(rt); 225 if (need_loop) 226 in6_ifloop_request(RTM_ADD, ifa); 227 } 228 229 /* 230 * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(), 231 * if it exists. 232 */ 233 static void 234 in6_ifremloop(struct ifaddr *ifa) 235 { 236 struct in6_ifaddr *ia; 237 struct rtentry *rt; 238 int ia_count = 0; 239 240 /* 241 * Some of BSD variants do not remove cloned routes 242 * from an interface direct route, when removing the direct route 243 * (see comments in net/net_osdep.h). Even for variants that do remove 244 * cloned routes, they could fail to remove the cloned routes when 245 * we handle multple addresses that share a common prefix. 246 * So, we should remove the route corresponding to the deleted address 247 * regardless of the result of in6_is_ifloop_auto(). 248 */ 249 250 /* 251 * Delete the entry only if exact one ifa exists. More than one ifa 252 * can exist if we assign a same single address to multiple 253 * (probably p2p) interfaces. 254 * XXX: we should avoid such a configuration in IPv6... 255 */ 256 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 257 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) { 258 ia_count++; 259 if (ia_count > 1) 260 break; 261 } 262 } 263 264 if (ia_count == 1) { 265 /* 266 * Before deleting, check if a corresponding loopbacked host 267 * route surely exists. With this check, we can avoid to 268 * delete an interface direct route whose destination is same 269 * as the address being removed. This can happen when removing 270 * a subnet-router anycast address on an interface attahced 271 * to a shared medium. 272 */ 273 rt = rtalloc1(ifa->ifa_addr, 0, 0); 274 if (rt != NULL) { 275 if ((rt->rt_flags & RTF_HOST) != 0 && 276 (rt->rt_ifp->if_flags & IFF_LOOPBACK) != 0) { 277 rtfree(rt); 278 in6_ifloop_request(RTM_DELETE, ifa); 279 } else 280 RT_UNLOCK(rt); 281 } 282 } 283 } 284 285 int 286 in6_mask2len(mask, lim0) 287 struct in6_addr *mask; 288 u_char *lim0; 289 { 290 int x = 0, y; 291 u_char *lim = lim0, *p; 292 293 /* ignore the scope_id part */ 294 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 295 lim = (u_char *)mask + sizeof(*mask); 296 for (p = (u_char *)mask; p < lim; x++, p++) { 297 if (*p != 0xff) 298 break; 299 } 300 y = 0; 301 if (p < lim) { 302 for (y = 0; y < 8; y++) { 303 if ((*p & (0x80 >> y)) == 0) 304 break; 305 } 306 } 307 308 /* 309 * when the limit pointer is given, do a stricter check on the 310 * remaining bits. 311 */ 312 if (p < lim) { 313 if (y != 0 && (*p & (0x00ff >> y)) != 0) 314 return (-1); 315 for (p = p + 1; p < lim; p++) 316 if (*p != 0) 317 return (-1); 318 } 319 320 return x * 8 + y; 321 } 322 323 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 324 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 325 326 int 327 in6_control(so, cmd, data, ifp, td) 328 struct socket *so; 329 u_long cmd; 330 caddr_t data; 331 struct ifnet *ifp; 332 struct thread *td; 333 { 334 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 335 struct in6_ifaddr *ia = NULL; 336 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 337 int privileged; 338 339 privileged = 0; 340 if (td == NULL || !suser(td)) 341 privileged++; 342 343 switch (cmd) { 344 case SIOCGETSGCNT_IN6: 345 case SIOCGETMIFCNT_IN6: 346 return (mrt6_ioctl(cmd, data)); 347 } 348 349 switch(cmd) { 350 case SIOCAADDRCTL_POLICY: 351 case SIOCDADDRCTL_POLICY: 352 if (!privileged) 353 return (EPERM); 354 return (in6_src_ioctl(cmd, data)); 355 } 356 357 if (ifp == NULL) 358 return (EOPNOTSUPP); 359 360 switch (cmd) { 361 case SIOCSNDFLUSH_IN6: 362 case SIOCSPFXFLUSH_IN6: 363 case SIOCSRTRFLUSH_IN6: 364 case SIOCSDEFIFACE_IN6: 365 case SIOCSIFINFO_FLAGS: 366 if (!privileged) 367 return (EPERM); 368 /* FALLTHROUGH */ 369 case OSIOCGIFINFO_IN6: 370 case SIOCGIFINFO_IN6: 371 case SIOCGDRLST_IN6: 372 case SIOCGPRLST_IN6: 373 case SIOCGNBRINFO_IN6: 374 case SIOCGDEFIFACE_IN6: 375 return (nd6_ioctl(cmd, data, ifp)); 376 } 377 378 switch (cmd) { 379 case SIOCSIFPREFIX_IN6: 380 case SIOCDIFPREFIX_IN6: 381 case SIOCAIFPREFIX_IN6: 382 case SIOCCIFPREFIX_IN6: 383 case SIOCSGIFPREFIX_IN6: 384 case SIOCGIFPREFIX_IN6: 385 log(LOG_NOTICE, 386 "prefix ioctls are now invalidated. " 387 "please use ifconfig.\n"); 388 return (EOPNOTSUPP); 389 } 390 391 switch (cmd) { 392 case SIOCSSCOPE6: 393 if (!privileged) 394 return (EPERM); 395 return (scope6_set(ifp, 396 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 397 case SIOCGSCOPE6: 398 return (scope6_get(ifp, 399 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 400 case SIOCGSCOPE6DEF: 401 return (scope6_get_default((struct scope6_id *) 402 ifr->ifr_ifru.ifru_scope_id)); 403 } 404 405 switch (cmd) { 406 case SIOCALIFADDR: 407 case SIOCDLIFADDR: 408 if (!privileged) 409 return (EPERM); 410 /* FALLTHROUGH */ 411 case SIOCGLIFADDR: 412 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 413 } 414 415 /* 416 * Find address for this interface, if it exists. 417 */ 418 if (ifra->ifra_addr.sin6_family == AF_INET6) { /* XXX */ 419 struct sockaddr_in6 *sa6 = 420 (struct sockaddr_in6 *)&ifra->ifra_addr; 421 422 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) { 423 if (sa6->sin6_addr.s6_addr16[1] == 0) { 424 /* link ID is not embedded by the user */ 425 sa6->sin6_addr.s6_addr16[1] = 426 htons(ifp->if_index); 427 } else if (sa6->sin6_addr.s6_addr16[1] != 428 htons(ifp->if_index)) { 429 return (EINVAL); /* link ID contradicts */ 430 } 431 if (sa6->sin6_scope_id) { 432 if (sa6->sin6_scope_id != 433 (u_int32_t)ifp->if_index) 434 return (EINVAL); 435 sa6->sin6_scope_id = 0; /* XXX: good way? */ 436 } 437 } 438 ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr); 439 } 440 441 switch (cmd) { 442 case SIOCSIFADDR_IN6: 443 case SIOCSIFDSTADDR_IN6: 444 case SIOCSIFNETMASK_IN6: 445 /* 446 * Since IPv6 allows a node to assign multiple addresses 447 * on a single interface, SIOCSIFxxx ioctls are not suitable 448 * and should be unused. 449 */ 450 /* we decided to obsolete this command (20000704) */ 451 return (EINVAL); 452 453 case SIOCDIFADDR_IN6: 454 /* 455 * for IPv4, we look for existing in_ifaddr here to allow 456 * "ifconfig if0 delete" to remove first IPv4 address on the 457 * interface. For IPv6, as the spec allow multiple interface 458 * address from the day one, we consider "remove the first one" 459 * semantics to be not preferable. 460 */ 461 if (ia == NULL) 462 return (EADDRNOTAVAIL); 463 /* FALLTHROUGH */ 464 case SIOCAIFADDR_IN6: 465 /* 466 * We always require users to specify a valid IPv6 address for 467 * the corresponding operation. 468 */ 469 if (ifra->ifra_addr.sin6_family != AF_INET6 || 470 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) 471 return (EAFNOSUPPORT); 472 if (!privileged) 473 return (EPERM); 474 475 break; 476 477 case SIOCGIFADDR_IN6: 478 /* This interface is basically deprecated. use SIOCGIFCONF. */ 479 /* FALLTHROUGH */ 480 case SIOCGIFAFLAG_IN6: 481 case SIOCGIFNETMASK_IN6: 482 case SIOCGIFDSTADDR_IN6: 483 case SIOCGIFALIFETIME_IN6: 484 /* must think again about its semantics */ 485 if (ia == NULL) 486 return (EADDRNOTAVAIL); 487 break; 488 case SIOCSIFALIFETIME_IN6: 489 { 490 struct in6_addrlifetime *lt; 491 492 if (!privileged) 493 return (EPERM); 494 if (ia == NULL) 495 return (EADDRNOTAVAIL); 496 /* sanity for overflow - beware unsigned */ 497 lt = &ifr->ifr_ifru.ifru_lifetime; 498 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME 499 && lt->ia6t_vltime + time_second < time_second) { 500 return EINVAL; 501 } 502 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME 503 && lt->ia6t_pltime + time_second < time_second) { 504 return EINVAL; 505 } 506 break; 507 } 508 } 509 510 switch (cmd) { 511 512 case SIOCGIFADDR_IN6: 513 ifr->ifr_addr = ia->ia_addr; 514 break; 515 516 case SIOCGIFDSTADDR_IN6: 517 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 518 return (EINVAL); 519 /* 520 * XXX: should we check if ifa_dstaddr is NULL and return 521 * an error? 522 */ 523 ifr->ifr_dstaddr = ia->ia_dstaddr; 524 break; 525 526 case SIOCGIFNETMASK_IN6: 527 ifr->ifr_addr = ia->ia_prefixmask; 528 break; 529 530 case SIOCGIFAFLAG_IN6: 531 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 532 break; 533 534 case SIOCGIFSTAT_IN6: 535 if (ifp == NULL) 536 return EINVAL; 537 bzero(&ifr->ifr_ifru.ifru_stat, 538 sizeof(ifr->ifr_ifru.ifru_stat)); 539 ifr->ifr_ifru.ifru_stat = 540 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat; 541 break; 542 543 case SIOCGIFSTAT_ICMP6: 544 if (ifp == NULL) 545 return EINVAL; 546 bzero(&ifr->ifr_ifru.ifru_stat, 547 sizeof(ifr->ifr_ifru.ifru_icmp6stat)); 548 ifr->ifr_ifru.ifru_icmp6stat = 549 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat; 550 break; 551 552 case SIOCGIFALIFETIME_IN6: 553 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 554 break; 555 556 case SIOCSIFALIFETIME_IN6: 557 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; 558 /* for sanity */ 559 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 560 ia->ia6_lifetime.ia6t_expire = 561 time_second + ia->ia6_lifetime.ia6t_vltime; 562 } else 563 ia->ia6_lifetime.ia6t_expire = 0; 564 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 565 ia->ia6_lifetime.ia6t_preferred = 566 time_second + ia->ia6_lifetime.ia6t_pltime; 567 } else 568 ia->ia6_lifetime.ia6t_preferred = 0; 569 break; 570 571 case SIOCAIFADDR_IN6: 572 { 573 int i, error = 0; 574 struct nd_prefix pr0, *pr; 575 576 /* 577 * first, make or update the interface address structure, 578 * and link it to the list. 579 */ 580 if ((error = in6_update_ifa(ifp, ifra, ia)) != 0) 581 return (error); 582 583 /* 584 * then, make the prefix on-link on the interface. 585 * XXX: we'd rather create the prefix before the address, but 586 * we need at least one address to install the corresponding 587 * interface route, so we configure the address first. 588 */ 589 590 /* 591 * convert mask to prefix length (prefixmask has already 592 * been validated in in6_update_ifa(). 593 */ 594 bzero(&pr0, sizeof(pr0)); 595 pr0.ndpr_ifp = ifp; 596 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 597 NULL); 598 if (pr0.ndpr_plen == 128) { 599 break; /* we don't need to install a host route. */ 600 } 601 pr0.ndpr_prefix = ifra->ifra_addr; 602 pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr; 603 /* apply the mask for safety. */ 604 for (i = 0; i < 4; i++) { 605 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 606 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i]; 607 } 608 /* 609 * XXX: since we don't have an API to set prefix (not address) 610 * lifetimes, we just use the same lifetimes as addresses. 611 * The (temporarily) installed lifetimes can be overridden by 612 * later advertised RAs (when accept_rtadv is non 0), which is 613 * an intended behavior. 614 */ 615 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 616 pr0.ndpr_raf_auto = 617 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 618 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 619 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 620 621 /* add the prefix if not yet. */ 622 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 623 /* 624 * nd6_prelist_add will install the corresponding 625 * interface route. 626 */ 627 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) 628 return (error); 629 if (pr == NULL) { 630 log(LOG_ERR, "nd6_prelist_add succeeded but " 631 "no prefix\n"); 632 return (EINVAL); /* XXX panic here? */ 633 } 634 } 635 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 636 == NULL) { 637 /* XXX: this should not happen! */ 638 log(LOG_ERR, "in6_control: addition succeeded, but" 639 " no ifaddr\n"); 640 } else { 641 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) != 0 && 642 ia->ia6_ndpr == NULL) { /* new autoconfed addr */ 643 ia->ia6_ndpr = pr; 644 pr->ndpr_refcnt++; 645 646 /* 647 * If this is the first autoconf address from 648 * the prefix, create a temporary address 649 * as well (when specified). 650 */ 651 if (ip6_use_tempaddr && 652 pr->ndpr_refcnt == 1) { 653 int e; 654 if ((e = in6_tmpifadd(ia, 1)) != 0) { 655 log(LOG_NOTICE, "in6_control: " 656 "failed to create a " 657 "temporary address, " 658 "errno=%d\n", e); 659 } 660 } 661 } 662 663 /* 664 * this might affect the status of autoconfigured 665 * addresses, that is, this address might make 666 * other addresses detached. 667 */ 668 pfxlist_onlink_check(); 669 } 670 break; 671 } 672 673 case SIOCDIFADDR_IN6: 674 { 675 int i = 0; 676 struct nd_prefix pr0, *pr; 677 678 /* 679 * If the address being deleted is the only one that owns 680 * the corresponding prefix, expire the prefix as well. 681 * XXX: theoretically, we don't have to worry about such 682 * relationship, since we separate the address management 683 * and the prefix management. We do this, however, to provide 684 * as much backward compatibility as possible in terms of 685 * the ioctl operation. 686 */ 687 bzero(&pr0, sizeof(pr0)); 688 pr0.ndpr_ifp = ifp; 689 pr0.ndpr_plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, 690 NULL); 691 if (pr0.ndpr_plen == 128) 692 goto purgeaddr; 693 pr0.ndpr_prefix = ia->ia_addr; 694 pr0.ndpr_mask = ia->ia_prefixmask.sin6_addr; 695 for (i = 0; i < 4; i++) { 696 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 697 ia->ia_prefixmask.sin6_addr.s6_addr32[i]; 698 } 699 /* 700 * The logic of the following condition is a bit complicated. 701 * We expire the prefix when 702 * 1. the address obeys autoconfiguration and it is the 703 * only owner of the associated prefix, or 704 * 2. the address does not obey autoconf and there is no 705 * other owner of the prefix. 706 */ 707 if ((pr = nd6_prefix_lookup(&pr0)) != NULL && 708 (((ia->ia6_flags & IN6_IFF_AUTOCONF) != 0 && 709 pr->ndpr_refcnt == 1) || 710 ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0 && 711 pr->ndpr_refcnt == 0))) { 712 pr->ndpr_expire = 1; /* XXX: just for expiration */ 713 } 714 715 purgeaddr: 716 in6_purgeaddr(&ia->ia_ifa); 717 break; 718 } 719 720 default: 721 if (ifp == NULL || ifp->if_ioctl == 0) 722 return (EOPNOTSUPP); 723 return ((*ifp->if_ioctl)(ifp, cmd, data)); 724 } 725 726 return (0); 727 } 728 729 /* 730 * Update parameters of an IPv6 interface address. 731 * If necessary, a new entry is created and linked into address chains. 732 * This function is separated from in6_control(). 733 * XXX: should this be performed under splnet()? 734 */ 735 int 736 in6_update_ifa(ifp, ifra, ia) 737 struct ifnet *ifp; 738 struct in6_aliasreq *ifra; 739 struct in6_ifaddr *ia; 740 { 741 int error = 0, hostIsNew = 0, plen = -1; 742 struct in6_ifaddr *oia; 743 struct sockaddr_in6 dst6; 744 struct in6_addrlifetime *lt; 745 746 /* Validate parameters */ 747 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 748 return (EINVAL); 749 750 /* 751 * The destination address for a p2p link must have a family 752 * of AF_UNSPEC or AF_INET6. 753 */ 754 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 755 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 756 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 757 return (EAFNOSUPPORT); 758 /* 759 * validate ifra_prefixmask. don't check sin6_family, netmask 760 * does not carry fields other than sin6_len. 761 */ 762 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 763 return (EINVAL); 764 /* 765 * Because the IPv6 address architecture is classless, we require 766 * users to specify a (non 0) prefix length (mask) for a new address. 767 * We also require the prefix (when specified) mask is valid, and thus 768 * reject a non-consecutive mask. 769 */ 770 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 771 return (EINVAL); 772 if (ifra->ifra_prefixmask.sin6_len != 0) { 773 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 774 (u_char *)&ifra->ifra_prefixmask + 775 ifra->ifra_prefixmask.sin6_len); 776 if (plen <= 0) 777 return (EINVAL); 778 } else { 779 /* 780 * In this case, ia must not be NULL. We just use its prefix 781 * length. 782 */ 783 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 784 } 785 /* 786 * If the destination address on a p2p interface is specified, 787 * and the address is a scoped one, validate/set the scope 788 * zone identifier. 789 */ 790 dst6 = ifra->ifra_dstaddr; 791 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 792 (dst6.sin6_family == AF_INET6)) { 793 int scopeid; 794 795 if ((error = in6_recoverscope(&dst6, 796 &ifra->ifra_dstaddr.sin6_addr, ifp)) != 0) 797 return (error); 798 if (in6_addr2zoneid(ifp, &dst6.sin6_addr, &scopeid)) 799 return (EINVAL); 800 if (dst6.sin6_scope_id == 0) /* user omit to specify the ID. */ 801 dst6.sin6_scope_id = scopeid; 802 else if (dst6.sin6_scope_id != scopeid) 803 return (EINVAL); /* scope ID mismatch. */ 804 if ((error = in6_embedscope(&dst6.sin6_addr, &dst6, NULL, NULL)) 805 != 0) 806 return (error); 807 dst6.sin6_scope_id = 0; /* XXX */ 808 } 809 /* 810 * The destination address can be specified only for a p2p or a 811 * loopback interface. If specified, the corresponding prefix length 812 * must be 128. 813 */ 814 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 815 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 816 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 817 "be specified for a p2p or a loopback IF only\n")); 818 return (EINVAL); 819 } 820 if (plen != 128) { 821 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 822 "be 128 when dstaddr is specified\n")); 823 return (EINVAL); 824 } 825 } 826 /* lifetime consistency check */ 827 lt = &ifra->ifra_lifetime; 828 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME 829 && lt->ia6t_vltime + time_second < time_second) { 830 return EINVAL; 831 } 832 if (lt->ia6t_vltime == 0) { 833 /* 834 * the following log might be noisy, but this is a typical 835 * configuration mistake or a tool's bug. 836 */ 837 nd6log((LOG_INFO, 838 "in6_update_ifa: valid lifetime is 0 for %s\n", 839 ip6_sprintf(&ifra->ifra_addr.sin6_addr))); 840 } 841 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME 842 && lt->ia6t_pltime + time_second < time_second) { 843 return EINVAL; 844 } 845 846 /* 847 * If this is a new address, allocate a new ifaddr and link it 848 * into chains. 849 */ 850 if (ia == NULL) { 851 hostIsNew = 1; 852 /* 853 * When in6_update_ifa() is called in a process of a received 854 * RA, it is called under an interrupt context. So, we should 855 * call malloc with M_NOWAIT. 856 */ 857 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR, 858 M_NOWAIT); 859 if (ia == NULL) 860 return (ENOBUFS); 861 bzero((caddr_t)ia, sizeof(*ia)); 862 /* Initialize the address and masks */ 863 IFA_LOCK_INIT(&ia->ia_ifa); 864 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 865 ia->ia_addr.sin6_family = AF_INET6; 866 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 867 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 868 /* 869 * XXX: some functions expect that ifa_dstaddr is not 870 * NULL for p2p interfaces. 871 */ 872 ia->ia_ifa.ifa_dstaddr = 873 (struct sockaddr *)&ia->ia_dstaddr; 874 } else { 875 ia->ia_ifa.ifa_dstaddr = NULL; 876 } 877 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 878 879 ia->ia_ifp = ifp; 880 if ((oia = in6_ifaddr) != NULL) { 881 for ( ; oia->ia_next; oia = oia->ia_next) 882 continue; 883 oia->ia_next = ia; 884 } else 885 in6_ifaddr = ia; 886 887 ia->ia_ifa.ifa_refcnt = 1; 888 TAILQ_INSERT_TAIL(&ifp->if_addrlist, &ia->ia_ifa, ifa_list); 889 } 890 891 /* set prefix mask */ 892 if (ifra->ifra_prefixmask.sin6_len) { 893 /* 894 * We prohibit changing the prefix length of an existing 895 * address, because 896 * + such an operation should be rare in IPv6, and 897 * + the operation would confuse prefix management. 898 */ 899 if (ia->ia_prefixmask.sin6_len && 900 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 901 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an" 902 " existing (%s) address should not be changed\n", 903 ip6_sprintf(&ia->ia_addr.sin6_addr))); 904 error = EINVAL; 905 goto unlink; 906 } 907 ia->ia_prefixmask = ifra->ifra_prefixmask; 908 } 909 910 /* 911 * If a new destination address is specified, scrub the old one and 912 * install the new destination. Note that the interface must be 913 * p2p or loopback (see the check above.) 914 */ 915 if (dst6.sin6_family == AF_INET6 && 916 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 917 int e; 918 919 if ((ia->ia_flags & IFA_ROUTE) != 0 && 920 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) { 921 nd6log((LOG_ERR, "in6_update_ifa: failed to remove " 922 "a route to the old destination: %s\n", 923 ip6_sprintf(&ia->ia_addr.sin6_addr))); 924 /* proceed anyway... */ 925 } else 926 ia->ia_flags &= ~IFA_ROUTE; 927 ia->ia_dstaddr = dst6; 928 } 929 930 /* reset the interface and routing table appropriately. */ 931 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 932 goto unlink; 933 934 /* 935 * Beyond this point, we should call in6_purgeaddr upon an error, 936 * not just go to unlink. 937 */ 938 939 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 940 struct sockaddr_in6 mltaddr, mltmask; 941 struct in6_multi *in6m; 942 943 if (hostIsNew) { 944 /* join solicited multicast addr for new host id */ 945 struct in6_addr llsol; 946 947 bzero(&llsol, sizeof(struct in6_addr)); 948 llsol.s6_addr16[0] = htons(0xff02); 949 llsol.s6_addr16[1] = htons(ifp->if_index); 950 llsol.s6_addr32[1] = 0; 951 llsol.s6_addr32[2] = htonl(1); 952 llsol.s6_addr32[3] = 953 ifra->ifra_addr.sin6_addr.s6_addr32[3]; 954 llsol.s6_addr8[12] = 0xff; 955 (void)in6_addmulti(&llsol, ifp, &error); 956 if (error != 0) { 957 nd6log((LOG_WARNING, 958 "in6_update_ifa: addmulti failed for " 959 "%s on %s (errno=%d)\n", 960 ip6_sprintf(&llsol), if_name(ifp), 961 error)); 962 in6_purgeaddr((struct ifaddr *)ia); 963 return (error); 964 } 965 } 966 967 bzero(&mltmask, sizeof(mltmask)); 968 mltmask.sin6_len = sizeof(struct sockaddr_in6); 969 mltmask.sin6_family = AF_INET6; 970 mltmask.sin6_addr = in6mask32; 971 972 /* 973 * join link-local all-nodes address 974 */ 975 bzero(&mltaddr, sizeof(mltaddr)); 976 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 977 mltaddr.sin6_family = AF_INET6; 978 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 979 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 980 981 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 982 if (in6m == NULL) { 983 rtrequest(RTM_ADD, 984 (struct sockaddr *)&mltaddr, 985 (struct sockaddr *)&ia->ia_addr, 986 (struct sockaddr *)&mltmask, 987 RTF_UP|RTF_CLONING, /* xxx */ 988 (struct rtentry **)0); 989 (void)in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 990 if (error != 0) { 991 nd6log((LOG_WARNING, 992 "in6_update_ifa: addmulti failed for " 993 "%s on %s (errno=%d)\n", 994 ip6_sprintf(&mltaddr.sin6_addr), 995 if_name(ifp), error)); 996 } 997 } 998 999 /* 1000 * join node information group address 1001 */ 1002 #define hostnamelen strlen(hostname) 1003 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr.sin6_addr) 1004 == 0) { 1005 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1006 if (in6m == NULL && ia != NULL) { 1007 (void)in6_addmulti(&mltaddr.sin6_addr, 1008 ifp, &error); 1009 if (error != 0) { 1010 nd6log((LOG_WARNING, "in6_update_ifa: " 1011 "addmulti failed for " 1012 "%s on %s (errno=%d)\n", 1013 ip6_sprintf(&mltaddr.sin6_addr), 1014 if_name(ifp), error)); 1015 } 1016 } 1017 } 1018 #undef hostnamelen 1019 1020 /* 1021 * join node-local all-nodes address, on loopback. 1022 * XXX: since "node-local" is obsoleted by interface-local, 1023 * we have to join the group on every interface with 1024 * some interface-boundary restriction. 1025 */ 1026 if (ifp->if_flags & IFF_LOOPBACK) { 1027 struct in6_ifaddr *ia_loop; 1028 1029 struct in6_addr loop6 = in6addr_loopback; 1030 ia_loop = in6ifa_ifpwithaddr(ifp, &loop6); 1031 1032 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1033 1034 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1035 if (in6m == NULL && ia_loop != NULL) { 1036 rtrequest(RTM_ADD, 1037 (struct sockaddr *)&mltaddr, 1038 (struct sockaddr *)&ia_loop->ia_addr, 1039 (struct sockaddr *)&mltmask, 1040 RTF_UP, 1041 (struct rtentry **)0); 1042 (void)in6_addmulti(&mltaddr.sin6_addr, ifp, 1043 &error); 1044 if (error != 0) { 1045 nd6log((LOG_WARNING, "in6_update_ifa: " 1046 "addmulti failed for %s on %s " 1047 "(errno=%d)\n", 1048 ip6_sprintf(&mltaddr.sin6_addr), 1049 if_name(ifp), error)); 1050 } 1051 } 1052 } 1053 } 1054 1055 ia->ia6_flags = ifra->ifra_flags; 1056 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /*safety*/ 1057 ia->ia6_flags &= ~IN6_IFF_NODAD; /* Mobile IPv6 */ 1058 1059 ia->ia6_lifetime = ifra->ifra_lifetime; 1060 /* for sanity */ 1061 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1062 ia->ia6_lifetime.ia6t_expire = 1063 time_second + ia->ia6_lifetime.ia6t_vltime; 1064 } else 1065 ia->ia6_lifetime.ia6t_expire = 0; 1066 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1067 ia->ia6_lifetime.ia6t_preferred = 1068 time_second + ia->ia6_lifetime.ia6t_pltime; 1069 } else 1070 ia->ia6_lifetime.ia6t_preferred = 0; 1071 1072 /* 1073 * Perform DAD, if needed. 1074 * XXX It may be of use, if we can administratively 1075 * disable DAD. 1076 */ 1077 if (in6if_do_dad(ifp) && (ifra->ifra_flags & IN6_IFF_NODAD) == 0) { 1078 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1079 nd6_dad_start((struct ifaddr *)ia, NULL); 1080 } 1081 1082 return (error); 1083 1084 unlink: 1085 /* 1086 * XXX: if a change of an existing address failed, keep the entry 1087 * anyway. 1088 */ 1089 if (hostIsNew) 1090 in6_unlink_ifa(ia, ifp); 1091 return (error); 1092 } 1093 1094 void 1095 in6_purgeaddr(ifa) 1096 struct ifaddr *ifa; 1097 { 1098 struct ifnet *ifp = ifa->ifa_ifp; 1099 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1100 1101 /* stop DAD processing */ 1102 nd6_dad_stop(ifa); 1103 1104 /* 1105 * delete route to the destination of the address being purged. 1106 * The interface must be p2p or loopback in this case. 1107 */ 1108 if ((ia->ia_flags & IFA_ROUTE) != 0 && ia->ia_dstaddr.sin6_len != 0) { 1109 int e; 1110 1111 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 1112 != 0) { 1113 log(LOG_ERR, "in6_purgeaddr: failed to remove " 1114 "a route to the p2p destination: %s on %s, " 1115 "errno=%d\n", 1116 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp), 1117 e); 1118 /* proceed anyway... */ 1119 } else 1120 ia->ia_flags &= ~IFA_ROUTE; 1121 } 1122 1123 /* Remove ownaddr's loopback rtentry, if it exists. */ 1124 in6_ifremloop(&(ia->ia_ifa)); 1125 1126 if (ifp->if_flags & IFF_MULTICAST) { 1127 /* 1128 * delete solicited multicast addr for deleting host id 1129 */ 1130 struct in6_multi *in6m; 1131 struct in6_addr llsol; 1132 bzero(&llsol, sizeof(struct in6_addr)); 1133 llsol.s6_addr16[0] = htons(0xff02); 1134 llsol.s6_addr16[1] = htons(ifp->if_index); 1135 llsol.s6_addr32[1] = 0; 1136 llsol.s6_addr32[2] = htonl(1); 1137 llsol.s6_addr32[3] = 1138 ia->ia_addr.sin6_addr.s6_addr32[3]; 1139 llsol.s6_addr8[12] = 0xff; 1140 1141 IN6_LOOKUP_MULTI(llsol, ifp, in6m); 1142 if (in6m) 1143 in6_delmulti(in6m); 1144 } 1145 1146 in6_unlink_ifa(ia, ifp); 1147 } 1148 1149 static void 1150 in6_unlink_ifa(ia, ifp) 1151 struct in6_ifaddr *ia; 1152 struct ifnet *ifp; 1153 { 1154 int plen, iilen; 1155 struct in6_ifaddr *oia; 1156 int s = splnet(); 1157 1158 TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list); 1159 1160 oia = ia; 1161 if (oia == (ia = in6_ifaddr)) 1162 in6_ifaddr = ia->ia_next; 1163 else { 1164 while (ia->ia_next && (ia->ia_next != oia)) 1165 ia = ia->ia_next; 1166 if (ia->ia_next) 1167 ia->ia_next = oia->ia_next; 1168 else { 1169 /* search failed */ 1170 printf("Couldn't unlink in6_ifaddr from in6_ifaddr\n"); 1171 } 1172 } 1173 1174 if (oia->ia6_ifpr) { /* check for safety */ 1175 plen = in6_mask2len(&oia->ia_prefixmask.sin6_addr, NULL); 1176 iilen = (sizeof(oia->ia_prefixmask.sin6_addr) << 3) - plen; 1177 in6_prefix_remove_ifid(iilen, oia); 1178 } 1179 1180 /* 1181 * When an autoconfigured address is being removed, release the 1182 * reference to the base prefix. Also, since the release might 1183 * affect the status of other (detached) addresses, call 1184 * pfxlist_onlink_check(). 1185 */ 1186 if ((oia->ia6_flags & IN6_IFF_AUTOCONF) != 0) { 1187 if (oia->ia6_ndpr == NULL) { 1188 nd6log((LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address " 1189 "%p has no prefix\n", oia)); 1190 } else { 1191 oia->ia6_ndpr->ndpr_refcnt--; 1192 oia->ia6_flags &= ~IN6_IFF_AUTOCONF; 1193 oia->ia6_ndpr = NULL; 1194 } 1195 1196 pfxlist_onlink_check(); 1197 } 1198 1199 /* 1200 * release another refcnt for the link from in6_ifaddr. 1201 * Note that we should decrement the refcnt at least once for all *BSD. 1202 */ 1203 IFAFREE(&oia->ia_ifa); 1204 1205 splx(s); 1206 } 1207 1208 void 1209 in6_purgeif(ifp) 1210 struct ifnet *ifp; 1211 { 1212 struct ifaddr *ifa, *nifa; 1213 1214 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa) { 1215 nifa = TAILQ_NEXT(ifa, ifa_list); 1216 if (ifa->ifa_addr->sa_family != AF_INET6) 1217 continue; 1218 in6_purgeaddr(ifa); 1219 } 1220 1221 in6_ifdetach(ifp); 1222 } 1223 1224 /* 1225 * SIOC[GAD]LIFADDR. 1226 * SIOCGLIFADDR: get first address. (?) 1227 * SIOCGLIFADDR with IFLR_PREFIX: 1228 * get first address that matches the specified prefix. 1229 * SIOCALIFADDR: add the specified address. 1230 * SIOCALIFADDR with IFLR_PREFIX: 1231 * add the specified prefix, filling hostid part from 1232 * the first link-local address. prefixlen must be <= 64. 1233 * SIOCDLIFADDR: delete the specified address. 1234 * SIOCDLIFADDR with IFLR_PREFIX: 1235 * delete the first address that matches the specified prefix. 1236 * return values: 1237 * EINVAL on invalid parameters 1238 * EADDRNOTAVAIL on prefix match failed/specified address not found 1239 * other values may be returned from in6_ioctl() 1240 * 1241 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1242 * this is to accomodate address naming scheme other than RFC2374, 1243 * in the future. 1244 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1245 * address encoding scheme. (see figure on page 8) 1246 */ 1247 static int 1248 in6_lifaddr_ioctl(so, cmd, data, ifp, td) 1249 struct socket *so; 1250 u_long cmd; 1251 caddr_t data; 1252 struct ifnet *ifp; 1253 struct thread *td; 1254 { 1255 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1256 struct ifaddr *ifa; 1257 struct sockaddr *sa; 1258 1259 /* sanity checks */ 1260 if (!data || !ifp) { 1261 panic("invalid argument to in6_lifaddr_ioctl"); 1262 /* NOTREACHED */ 1263 } 1264 1265 switch (cmd) { 1266 case SIOCGLIFADDR: 1267 /* address must be specified on GET with IFLR_PREFIX */ 1268 if ((iflr->flags & IFLR_PREFIX) == 0) 1269 break; 1270 /* FALLTHROUGH */ 1271 case SIOCALIFADDR: 1272 case SIOCDLIFADDR: 1273 /* address must be specified on ADD and DELETE */ 1274 sa = (struct sockaddr *)&iflr->addr; 1275 if (sa->sa_family != AF_INET6) 1276 return EINVAL; 1277 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1278 return EINVAL; 1279 /* XXX need improvement */ 1280 sa = (struct sockaddr *)&iflr->dstaddr; 1281 if (sa->sa_family && sa->sa_family != AF_INET6) 1282 return EINVAL; 1283 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1284 return EINVAL; 1285 break; 1286 default: /* shouldn't happen */ 1287 #if 0 1288 panic("invalid cmd to in6_lifaddr_ioctl"); 1289 /* NOTREACHED */ 1290 #else 1291 return EOPNOTSUPP; 1292 #endif 1293 } 1294 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) 1295 return EINVAL; 1296 1297 switch (cmd) { 1298 case SIOCALIFADDR: 1299 { 1300 struct in6_aliasreq ifra; 1301 struct in6_addr *hostid = NULL; 1302 int prefixlen; 1303 1304 if ((iflr->flags & IFLR_PREFIX) != 0) { 1305 struct sockaddr_in6 *sin6; 1306 1307 /* 1308 * hostid is to fill in the hostid part of the 1309 * address. hostid points to the first link-local 1310 * address attached to the interface. 1311 */ 1312 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1313 if (!ifa) 1314 return EADDRNOTAVAIL; 1315 hostid = IFA_IN6(ifa); 1316 1317 /* prefixlen must be <= 64. */ 1318 if (64 < iflr->prefixlen) 1319 return EINVAL; 1320 prefixlen = iflr->prefixlen; 1321 1322 /* hostid part must be zero. */ 1323 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1324 if (sin6->sin6_addr.s6_addr32[2] != 0 1325 || sin6->sin6_addr.s6_addr32[3] != 0) { 1326 return EINVAL; 1327 } 1328 } else 1329 prefixlen = iflr->prefixlen; 1330 1331 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1332 bzero(&ifra, sizeof(ifra)); 1333 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name)); 1334 1335 bcopy(&iflr->addr, &ifra.ifra_addr, 1336 ((struct sockaddr *)&iflr->addr)->sa_len); 1337 if (hostid) { 1338 /* fill in hostid part */ 1339 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1340 hostid->s6_addr32[2]; 1341 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1342 hostid->s6_addr32[3]; 1343 } 1344 1345 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1346 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1347 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1348 if (hostid) { 1349 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1350 hostid->s6_addr32[2]; 1351 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1352 hostid->s6_addr32[3]; 1353 } 1354 } 1355 1356 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1357 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1358 1359 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1360 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td); 1361 } 1362 case SIOCGLIFADDR: 1363 case SIOCDLIFADDR: 1364 { 1365 struct in6_ifaddr *ia; 1366 struct in6_addr mask, candidate, match; 1367 struct sockaddr_in6 *sin6; 1368 int cmp; 1369 1370 bzero(&mask, sizeof(mask)); 1371 if (iflr->flags & IFLR_PREFIX) { 1372 /* lookup a prefix rather than address. */ 1373 in6_prefixlen2mask(&mask, iflr->prefixlen); 1374 1375 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1376 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1377 match.s6_addr32[0] &= mask.s6_addr32[0]; 1378 match.s6_addr32[1] &= mask.s6_addr32[1]; 1379 match.s6_addr32[2] &= mask.s6_addr32[2]; 1380 match.s6_addr32[3] &= mask.s6_addr32[3]; 1381 1382 /* if you set extra bits, that's wrong */ 1383 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1384 return EINVAL; 1385 1386 cmp = 1; 1387 } else { 1388 if (cmd == SIOCGLIFADDR) { 1389 /* on getting an address, take the 1st match */ 1390 cmp = 0; /* XXX */ 1391 } else { 1392 /* on deleting an address, do exact match */ 1393 in6_prefixlen2mask(&mask, 128); 1394 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1395 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1396 1397 cmp = 1; 1398 } 1399 } 1400 1401 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1402 if (ifa->ifa_addr->sa_family != AF_INET6) 1403 continue; 1404 if (!cmp) 1405 break; 1406 1407 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1408 /* 1409 * XXX: this is adhoc, but is necessary to allow 1410 * a user to specify fe80::/64 (not /10) for a 1411 * link-local address. 1412 */ 1413 if (IN6_IS_ADDR_LINKLOCAL(&candidate)) 1414 candidate.s6_addr16[1] = 0; 1415 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1416 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1417 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1418 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1419 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1420 break; 1421 } 1422 if (!ifa) 1423 return EADDRNOTAVAIL; 1424 ia = ifa2ia6(ifa); 1425 1426 if (cmd == SIOCGLIFADDR) { 1427 struct sockaddr_in6 *s6; 1428 1429 /* fill in the if_laddrreq structure */ 1430 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1431 s6 = (struct sockaddr_in6 *)&iflr->addr; 1432 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) { 1433 s6->sin6_addr.s6_addr16[1] = 0; 1434 if (in6_addr2zoneid(ifp, &s6->sin6_addr, 1435 &s6->sin6_scope_id)) 1436 return (EINVAL);/* XXX */ 1437 } 1438 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1439 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1440 ia->ia_dstaddr.sin6_len); 1441 s6 = (struct sockaddr_in6 *)&iflr->dstaddr; 1442 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) { 1443 s6->sin6_addr.s6_addr16[1] = 0; 1444 if (in6_addr2zoneid(ifp, 1445 &s6->sin6_addr, &s6->sin6_scope_id)) 1446 return (EINVAL); /* EINVAL */ 1447 } 1448 } else 1449 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1450 1451 iflr->prefixlen = 1452 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1453 1454 iflr->flags = ia->ia6_flags; /* XXX */ 1455 1456 return 0; 1457 } else { 1458 struct in6_aliasreq ifra; 1459 1460 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1461 bzero(&ifra, sizeof(ifra)); 1462 bcopy(iflr->iflr_name, ifra.ifra_name, 1463 sizeof(ifra.ifra_name)); 1464 1465 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1466 ia->ia_addr.sin6_len); 1467 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1468 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1469 ia->ia_dstaddr.sin6_len); 1470 } else { 1471 bzero(&ifra.ifra_dstaddr, 1472 sizeof(ifra.ifra_dstaddr)); 1473 } 1474 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1475 ia->ia_prefixmask.sin6_len); 1476 1477 ifra.ifra_flags = ia->ia6_flags; 1478 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, 1479 ifp, td); 1480 } 1481 } 1482 } 1483 1484 return EOPNOTSUPP; /* just for safety */ 1485 } 1486 1487 /* 1488 * Initialize an interface's intetnet6 address 1489 * and routing table entry. 1490 */ 1491 static int 1492 in6_ifinit(ifp, ia, sin6, newhost) 1493 struct ifnet *ifp; 1494 struct in6_ifaddr *ia; 1495 struct sockaddr_in6 *sin6; 1496 int newhost; 1497 { 1498 int error = 0, plen, ifacount = 0; 1499 int s = splimp(); 1500 struct ifaddr *ifa; 1501 1502 /* 1503 * Give the interface a chance to initialize 1504 * if this is its first address, 1505 * and to validate the address if necessary. 1506 */ 1507 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1508 if (ifa->ifa_addr == NULL) 1509 continue; /* just for safety */ 1510 if (ifa->ifa_addr->sa_family != AF_INET6) 1511 continue; 1512 ifacount++; 1513 } 1514 1515 ia->ia_addr = *sin6; 1516 1517 if (ifacount <= 1 && ifp->if_ioctl && 1518 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) { 1519 splx(s); 1520 return (error); 1521 } 1522 splx(s); 1523 1524 ia->ia_ifa.ifa_metric = ifp->if_metric; 1525 1526 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1527 1528 /* 1529 * Special case: 1530 * If the destination address is specified for a point-to-point 1531 * interface, install a route to the destination as an interface 1532 * direct route. 1533 */ 1534 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1535 if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) { 1536 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, 1537 RTF_UP | RTF_HOST)) != 0) 1538 return (error); 1539 ia->ia_flags |= IFA_ROUTE; 1540 } 1541 if (plen < 128) { 1542 /* 1543 * The RTF_CLONING flag is necessary for in6_is_ifloop_auto(). 1544 */ 1545 ia->ia_ifa.ifa_flags |= RTF_CLONING; 1546 } 1547 1548 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1549 if (newhost) { 1550 /* set the rtrequest function to create llinfo */ 1551 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1552 in6_ifaddloop(&(ia->ia_ifa)); 1553 } 1554 1555 return (error); 1556 } 1557 1558 /* 1559 * Add an address to the list of IP6 multicast addresses for a 1560 * given interface. 1561 */ 1562 struct in6_multi * 1563 in6_addmulti(maddr6, ifp, errorp) 1564 struct in6_addr *maddr6; 1565 struct ifnet *ifp; 1566 int *errorp; 1567 { 1568 struct in6_multi *in6m; 1569 struct sockaddr_in6 sin6; 1570 struct ifmultiaddr *ifma; 1571 int s = splnet(); 1572 1573 *errorp = 0; 1574 1575 /* 1576 * Call generic routine to add membership or increment 1577 * refcount. It wants addresses in the form of a sockaddr, 1578 * so we build one here (being careful to zero the unused bytes). 1579 */ 1580 bzero(&sin6, sizeof sin6); 1581 sin6.sin6_family = AF_INET6; 1582 sin6.sin6_len = sizeof sin6; 1583 sin6.sin6_addr = *maddr6; 1584 *errorp = if_addmulti(ifp, (struct sockaddr *)&sin6, &ifma); 1585 if (*errorp) { 1586 splx(s); 1587 return 0; 1588 } 1589 1590 /* 1591 * If ifma->ifma_protospec is null, then if_addmulti() created 1592 * a new record. Otherwise, we are done. 1593 */ 1594 if (ifma->ifma_protospec != 0) 1595 return ifma->ifma_protospec; 1596 1597 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 1598 at interrupt time? If so, need to fix if_addmulti. XXX */ 1599 in6m = (struct in6_multi *)malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT); 1600 if (in6m == NULL) { 1601 splx(s); 1602 return (NULL); 1603 } 1604 1605 bzero(in6m, sizeof *in6m); 1606 in6m->in6m_addr = *maddr6; 1607 in6m->in6m_ifp = ifp; 1608 in6m->in6m_ifma = ifma; 1609 ifma->ifma_protospec = in6m; 1610 LIST_INSERT_HEAD(&in6_multihead, in6m, in6m_entry); 1611 1612 /* 1613 * Let MLD6 know that we have joined a new IPv6 multicast 1614 * group. 1615 */ 1616 mld6_start_listening(in6m); 1617 splx(s); 1618 return (in6m); 1619 } 1620 1621 /* 1622 * Delete a multicast address record. 1623 */ 1624 void 1625 in6_delmulti(in6m) 1626 struct in6_multi *in6m; 1627 { 1628 struct ifmultiaddr *ifma = in6m->in6m_ifma; 1629 int s = splnet(); 1630 1631 if (ifma->ifma_refcount == 1) { 1632 /* 1633 * No remaining claims to this record; let MLD6 know 1634 * that we are leaving the multicast group. 1635 */ 1636 mld6_stop_listening(in6m); 1637 ifma->ifma_protospec = 0; 1638 LIST_REMOVE(in6m, in6m_entry); 1639 free(in6m, M_IPMADDR); 1640 } 1641 /* XXX - should be separate API for when we have an ifma? */ 1642 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1643 splx(s); 1644 } 1645 1646 /* 1647 * Find an IPv6 interface link-local address specific to an interface. 1648 */ 1649 struct in6_ifaddr * 1650 in6ifa_ifpforlinklocal(ifp, ignoreflags) 1651 struct ifnet *ifp; 1652 int ignoreflags; 1653 { 1654 struct ifaddr *ifa; 1655 1656 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1657 if (ifa->ifa_addr == NULL) 1658 continue; /* just for safety */ 1659 if (ifa->ifa_addr->sa_family != AF_INET6) 1660 continue; 1661 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1662 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1663 ignoreflags) != 0) 1664 continue; 1665 break; 1666 } 1667 } 1668 1669 return ((struct in6_ifaddr *)ifa); 1670 } 1671 1672 1673 /* 1674 * find the internet address corresponding to a given interface and address. 1675 */ 1676 struct in6_ifaddr * 1677 in6ifa_ifpwithaddr(ifp, addr) 1678 struct ifnet *ifp; 1679 struct in6_addr *addr; 1680 { 1681 struct ifaddr *ifa; 1682 1683 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1684 if (ifa->ifa_addr == NULL) 1685 continue; /* just for safety */ 1686 if (ifa->ifa_addr->sa_family != AF_INET6) 1687 continue; 1688 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1689 break; 1690 } 1691 1692 return ((struct in6_ifaddr *)ifa); 1693 } 1694 1695 /* 1696 * Convert IP6 address to printable (loggable) representation. 1697 */ 1698 static char digits[] = "0123456789abcdef"; 1699 static int ip6round = 0; 1700 char * 1701 ip6_sprintf(addr) 1702 const struct in6_addr *addr; 1703 { 1704 static char ip6buf[8][48]; 1705 int i; 1706 char *cp; 1707 const u_short *a = (const u_short *)addr; 1708 const u_char *d; 1709 int dcolon = 0; 1710 1711 ip6round = (ip6round + 1) & 7; 1712 cp = ip6buf[ip6round]; 1713 1714 for (i = 0; i < 8; i++) { 1715 if (dcolon == 1) { 1716 if (*a == 0) { 1717 if (i == 7) 1718 *cp++ = ':'; 1719 a++; 1720 continue; 1721 } else 1722 dcolon = 2; 1723 } 1724 if (*a == 0) { 1725 if (dcolon == 0 && *(a + 1) == 0) { 1726 if (i == 0) 1727 *cp++ = ':'; 1728 *cp++ = ':'; 1729 dcolon = 1; 1730 } else { 1731 *cp++ = '0'; 1732 *cp++ = ':'; 1733 } 1734 a++; 1735 continue; 1736 } 1737 d = (const u_char *)a; 1738 *cp++ = digits[*d >> 4]; 1739 *cp++ = digits[*d++ & 0xf]; 1740 *cp++ = digits[*d >> 4]; 1741 *cp++ = digits[*d & 0xf]; 1742 *cp++ = ':'; 1743 a++; 1744 } 1745 *--cp = 0; 1746 return (ip6buf[ip6round]); 1747 } 1748 1749 int 1750 in6_localaddr(in6) 1751 struct in6_addr *in6; 1752 { 1753 struct in6_ifaddr *ia; 1754 1755 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1756 return 1; 1757 1758 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1759 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1760 &ia->ia_prefixmask.sin6_addr)) { 1761 return 1; 1762 } 1763 } 1764 1765 return (0); 1766 } 1767 1768 int 1769 in6_is_addr_deprecated(sa6) 1770 struct sockaddr_in6 *sa6; 1771 { 1772 struct in6_ifaddr *ia; 1773 1774 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1775 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1776 &sa6->sin6_addr) && 1777 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) 1778 return (1); /* true */ 1779 1780 /* XXX: do we still have to go thru the rest of the list? */ 1781 } 1782 1783 return (0); /* false */ 1784 } 1785 1786 /* 1787 * return length of part which dst and src are equal 1788 * hard coding... 1789 */ 1790 int 1791 in6_matchlen(src, dst) 1792 struct in6_addr *src, *dst; 1793 { 1794 int match = 0; 1795 u_char *s = (u_char *)src, *d = (u_char *)dst; 1796 u_char *lim = s + 16, r; 1797 1798 while (s < lim) 1799 if ((r = (*d++ ^ *s++)) != 0) { 1800 while (r < 128) { 1801 match++; 1802 r <<= 1; 1803 } 1804 break; 1805 } else 1806 match += 8; 1807 return match; 1808 } 1809 1810 /* XXX: to be scope conscious */ 1811 int 1812 in6_are_prefix_equal(p1, p2, len) 1813 struct in6_addr *p1, *p2; 1814 int len; 1815 { 1816 int bytelen, bitlen; 1817 1818 /* sanity check */ 1819 if (0 > len || len > 128) { 1820 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1821 len); 1822 return (0); 1823 } 1824 1825 bytelen = len / 8; 1826 bitlen = len % 8; 1827 1828 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1829 return (0); 1830 if (p1->s6_addr[bytelen] >> (8 - bitlen) != 1831 p2->s6_addr[bytelen] >> (8 - bitlen)) 1832 return (0); 1833 1834 return (1); 1835 } 1836 1837 void 1838 in6_prefixlen2mask(maskp, len) 1839 struct in6_addr *maskp; 1840 int len; 1841 { 1842 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1843 int bytelen, bitlen, i; 1844 1845 /* sanity check */ 1846 if (0 > len || len > 128) { 1847 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1848 len); 1849 return; 1850 } 1851 1852 bzero(maskp, sizeof(*maskp)); 1853 bytelen = len / 8; 1854 bitlen = len % 8; 1855 for (i = 0; i < bytelen; i++) 1856 maskp->s6_addr[i] = 0xff; 1857 if (bitlen) 1858 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1859 } 1860 1861 /* 1862 * return the best address out of the same scope. if no address was 1863 * found, return the first valid address from designated IF. 1864 */ 1865 struct in6_ifaddr * 1866 in6_ifawithifp(ifp, dst) 1867 struct ifnet *ifp; 1868 struct in6_addr *dst; 1869 { 1870 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 1871 struct ifaddr *ifa; 1872 struct in6_ifaddr *besta = 0; 1873 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 1874 1875 dep[0] = dep[1] = NULL; 1876 1877 /* 1878 * We first look for addresses in the same scope. 1879 * If there is one, return it. 1880 * If two or more, return one which matches the dst longest. 1881 * If none, return one of global addresses assigned other ifs. 1882 */ 1883 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1884 if (ifa->ifa_addr->sa_family != AF_INET6) 1885 continue; 1886 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1887 continue; /* XXX: is there any case to allow anycast? */ 1888 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1889 continue; /* don't use this interface */ 1890 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1891 continue; 1892 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1893 if (ip6_use_deprecated) 1894 dep[0] = (struct in6_ifaddr *)ifa; 1895 continue; 1896 } 1897 1898 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 1899 /* 1900 * call in6_matchlen() as few as possible 1901 */ 1902 if (besta) { 1903 if (blen == -1) 1904 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 1905 tlen = in6_matchlen(IFA_IN6(ifa), dst); 1906 if (tlen > blen) { 1907 blen = tlen; 1908 besta = (struct in6_ifaddr *)ifa; 1909 } 1910 } else 1911 besta = (struct in6_ifaddr *)ifa; 1912 } 1913 } 1914 if (besta) 1915 return (besta); 1916 1917 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1918 if (ifa->ifa_addr->sa_family != AF_INET6) 1919 continue; 1920 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1921 continue; /* XXX: is there any case to allow anycast? */ 1922 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1923 continue; /* don't use this interface */ 1924 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1925 continue; 1926 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1927 if (ip6_use_deprecated) 1928 dep[1] = (struct in6_ifaddr *)ifa; 1929 continue; 1930 } 1931 1932 return (struct in6_ifaddr *)ifa; 1933 } 1934 1935 /* use the last-resort values, that are, deprecated addresses */ 1936 if (dep[0]) 1937 return dep[0]; 1938 if (dep[1]) 1939 return dep[1]; 1940 1941 return NULL; 1942 } 1943 1944 /* 1945 * perform DAD when interface becomes IFF_UP. 1946 */ 1947 void 1948 in6_if_up(ifp) 1949 struct ifnet *ifp; 1950 { 1951 struct ifaddr *ifa; 1952 struct in6_ifaddr *ia; 1953 int dad_delay; /* delay ticks before DAD output */ 1954 1955 /* 1956 * special cases, like 6to4, are handled in in6_ifattach 1957 */ 1958 in6_ifattach(ifp, NULL); 1959 1960 dad_delay = 0; 1961 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1962 if (ifa->ifa_addr->sa_family != AF_INET6) 1963 continue; 1964 ia = (struct in6_ifaddr *)ifa; 1965 if (ia->ia6_flags & IN6_IFF_TENTATIVE) 1966 nd6_dad_start(ifa, &dad_delay); 1967 } 1968 } 1969 1970 int 1971 in6if_do_dad(ifp) 1972 struct ifnet *ifp; 1973 { 1974 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 1975 return (0); 1976 1977 switch (ifp->if_type) { 1978 #ifdef IFT_DUMMY 1979 case IFT_DUMMY: 1980 #endif 1981 case IFT_FAITH: 1982 /* 1983 * These interfaces do not have the IFF_LOOPBACK flag, 1984 * but loop packets back. We do not have to do DAD on such 1985 * interfaces. We should even omit it, because loop-backed 1986 * NS would confuse the DAD procedure. 1987 */ 1988 return (0); 1989 default: 1990 /* 1991 * Our DAD routine requires the interface up and running. 1992 * However, some interfaces can be up before the RUNNING 1993 * status. Additionaly, users may try to assign addresses 1994 * before the interface becomes up (or running). 1995 * We simply skip DAD in such a case as a work around. 1996 * XXX: we should rather mark "tentative" on such addresses, 1997 * and do DAD after the interface becomes ready. 1998 */ 1999 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != 2000 (IFF_UP|IFF_RUNNING)) 2001 return (0); 2002 2003 return (1); 2004 } 2005 } 2006 2007 /* 2008 * Calculate max IPv6 MTU through all the interfaces and store it 2009 * to in6_maxmtu. 2010 */ 2011 void 2012 in6_setmaxmtu() 2013 { 2014 unsigned long maxmtu = 0; 2015 struct ifnet *ifp; 2016 2017 IFNET_RLOCK(); 2018 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 2019 /* this function can be called during ifnet initialization */ 2020 if (!ifp->if_afdata[AF_INET6]) 2021 continue; 2022 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2023 IN6_LINKMTU(ifp) > maxmtu) 2024 maxmtu = IN6_LINKMTU(ifp); 2025 } 2026 IFNET_RUNLOCK(); 2027 if (maxmtu) /* update only when maxmtu is positive */ 2028 in6_maxmtu = maxmtu; 2029 } 2030 2031 void * 2032 in6_domifattach(ifp) 2033 struct ifnet *ifp; 2034 { 2035 struct in6_ifextra *ext; 2036 2037 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2038 bzero(ext, sizeof(*ext)); 2039 2040 ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat), 2041 M_IFADDR, M_WAITOK); 2042 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat)); 2043 2044 ext->icmp6_ifstat = 2045 (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat), 2046 M_IFADDR, M_WAITOK); 2047 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat)); 2048 2049 ext->nd_ifinfo = nd6_ifattach(ifp); 2050 ext->scope6_id = scope6_ifattach(ifp); 2051 return ext; 2052 } 2053 2054 void 2055 in6_domifdetach(ifp, aux) 2056 struct ifnet *ifp; 2057 void *aux; 2058 { 2059 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2060 2061 scope6_ifdetach(ext->scope6_id); 2062 nd6_ifdetach(ext->nd_ifinfo); 2063 free(ext->in6_ifstat, M_IFADDR); 2064 free(ext->icmp6_ifstat, M_IFADDR); 2065 free(ext, M_IFADDR); 2066 } 2067 2068 /* 2069 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2070 * v4 mapped addr or v4 compat addr 2071 */ 2072 void 2073 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2074 { 2075 bzero(sin, sizeof(*sin)); 2076 sin->sin_len = sizeof(struct sockaddr_in); 2077 sin->sin_family = AF_INET; 2078 sin->sin_port = sin6->sin6_port; 2079 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2080 } 2081 2082 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2083 void 2084 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2085 { 2086 bzero(sin6, sizeof(*sin6)); 2087 sin6->sin6_len = sizeof(struct sockaddr_in6); 2088 sin6->sin6_family = AF_INET6; 2089 sin6->sin6_port = sin->sin_port; 2090 sin6->sin6_addr.s6_addr32[0] = 0; 2091 sin6->sin6_addr.s6_addr32[1] = 0; 2092 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2093 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2094 } 2095 2096 /* Convert sockaddr_in6 into sockaddr_in. */ 2097 void 2098 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2099 { 2100 struct sockaddr_in *sin_p; 2101 struct sockaddr_in6 sin6; 2102 2103 /* 2104 * Save original sockaddr_in6 addr and convert it 2105 * to sockaddr_in. 2106 */ 2107 sin6 = *(struct sockaddr_in6 *)nam; 2108 sin_p = (struct sockaddr_in *)nam; 2109 in6_sin6_2_sin(sin_p, &sin6); 2110 } 2111 2112 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2113 void 2114 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2115 { 2116 struct sockaddr_in *sin_p; 2117 struct sockaddr_in6 *sin6_p; 2118 2119 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 2120 M_WAITOK); 2121 sin_p = (struct sockaddr_in *)*nam; 2122 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2123 FREE(*nam, M_SONAME); 2124 *nam = (struct sockaddr *)sin6_p; 2125 } 2126