in6.c revision 126264
1/* $FreeBSD: head/sys/netinet6/in6.c 126264 2004-02-26 04:27:55Z mlaier $ */ 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 106MALLOC_DEFINE(M_IPMADDR, "in6_multi", "internet multicast address"); 107 108/* 109 * Definitions of some costant IP6 addresses. 110 */ 111const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 112const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 113const struct in6_addr in6addr_nodelocal_allnodes = 114 IN6ADDR_NODELOCAL_ALLNODES_INIT; 115const struct in6_addr in6addr_linklocal_allnodes = 116 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 117const struct in6_addr in6addr_linklocal_allrouters = 118 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 119 120const struct in6_addr in6mask0 = IN6MASK0; 121const struct in6_addr in6mask32 = IN6MASK32; 122const struct in6_addr in6mask64 = IN6MASK64; 123const struct in6_addr in6mask96 = IN6MASK96; 124const struct in6_addr in6mask128 = IN6MASK128; 125 126const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6, 127 0, 0, IN6ADDR_ANY_INIT, 0}; 128 129static int in6_lifaddr_ioctl __P((struct socket *, u_long, caddr_t, 130 struct ifnet *, struct thread *)); 131static int in6_ifinit __P((struct ifnet *, struct in6_ifaddr *, 132 struct sockaddr_in6 *, int)); 133static void in6_unlink_ifa __P((struct in6_ifaddr *, struct ifnet *)); 134 135struct in6_multihead in6_multihead; /* XXX BSS initialization */ 136int (*faithprefix_p)(struct in6_addr *); 137 138/* 139 * Subroutine for in6_ifaddloop() and in6_ifremloop(). 140 * This routine does actual work. 141 */ 142static void 143in6_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 RT_REMREF(nrt); 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 */ 213static void 214in6_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 */ 233static void 234in6_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 285int 286in6_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 326int 327in6_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 if (error == 0 && ia) 671 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 672 break; 673 } 674 675 case SIOCDIFADDR_IN6: 676 { 677 int i = 0; 678 struct nd_prefix pr0, *pr; 679 680 /* 681 * If the address being deleted is the only one that owns 682 * the corresponding prefix, expire the prefix as well. 683 * XXX: theoretically, we don't have to worry about such 684 * relationship, since we separate the address management 685 * and the prefix management. We do this, however, to provide 686 * as much backward compatibility as possible in terms of 687 * the ioctl operation. 688 */ 689 bzero(&pr0, sizeof(pr0)); 690 pr0.ndpr_ifp = ifp; 691 pr0.ndpr_plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, 692 NULL); 693 if (pr0.ndpr_plen == 128) 694 goto purgeaddr; 695 pr0.ndpr_prefix = ia->ia_addr; 696 pr0.ndpr_mask = ia->ia_prefixmask.sin6_addr; 697 for (i = 0; i < 4; i++) { 698 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 699 ia->ia_prefixmask.sin6_addr.s6_addr32[i]; 700 } 701 /* 702 * The logic of the following condition is a bit complicated. 703 * We expire the prefix when 704 * 1. the address obeys autoconfiguration and it is the 705 * only owner of the associated prefix, or 706 * 2. the address does not obey autoconf and there is no 707 * other owner of the prefix. 708 */ 709 if ((pr = nd6_prefix_lookup(&pr0)) != NULL && 710 (((ia->ia6_flags & IN6_IFF_AUTOCONF) != 0 && 711 pr->ndpr_refcnt == 1) || 712 ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0 && 713 pr->ndpr_refcnt == 0))) { 714 pr->ndpr_expire = 1; /* XXX: just for expiration */ 715 } 716 717 purgeaddr: 718 in6_purgeaddr(&ia->ia_ifa); 719 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 720 break; 721 } 722 723 default: 724 if (ifp == NULL || ifp->if_ioctl == 0) 725 return (EOPNOTSUPP); 726 return ((*ifp->if_ioctl)(ifp, cmd, data)); 727 } 728 729 return (0); 730} 731 732/* 733 * Update parameters of an IPv6 interface address. 734 * If necessary, a new entry is created and linked into address chains. 735 * This function is separated from in6_control(). 736 * XXX: should this be performed under splnet()? 737 */ 738int 739in6_update_ifa(ifp, ifra, ia) 740 struct ifnet *ifp; 741 struct in6_aliasreq *ifra; 742 struct in6_ifaddr *ia; 743{ 744 int error = 0, hostIsNew = 0, plen = -1; 745 struct in6_ifaddr *oia; 746 struct sockaddr_in6 dst6; 747 struct in6_addrlifetime *lt; 748 749 /* Validate parameters */ 750 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 751 return (EINVAL); 752 753 /* 754 * The destination address for a p2p link must have a family 755 * of AF_UNSPEC or AF_INET6. 756 */ 757 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 758 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 759 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 760 return (EAFNOSUPPORT); 761 /* 762 * validate ifra_prefixmask. don't check sin6_family, netmask 763 * does not carry fields other than sin6_len. 764 */ 765 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 766 return (EINVAL); 767 /* 768 * Because the IPv6 address architecture is classless, we require 769 * users to specify a (non 0) prefix length (mask) for a new address. 770 * We also require the prefix (when specified) mask is valid, and thus 771 * reject a non-consecutive mask. 772 */ 773 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 774 return (EINVAL); 775 if (ifra->ifra_prefixmask.sin6_len != 0) { 776 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 777 (u_char *)&ifra->ifra_prefixmask + 778 ifra->ifra_prefixmask.sin6_len); 779 if (plen <= 0) 780 return (EINVAL); 781 } else { 782 /* 783 * In this case, ia must not be NULL. We just use its prefix 784 * length. 785 */ 786 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 787 } 788 /* 789 * If the destination address on a p2p interface is specified, 790 * and the address is a scoped one, validate/set the scope 791 * zone identifier. 792 */ 793 dst6 = ifra->ifra_dstaddr; 794 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 795 (dst6.sin6_family == AF_INET6)) { 796 int scopeid; 797 798 if ((error = in6_recoverscope(&dst6, 799 &ifra->ifra_dstaddr.sin6_addr, ifp)) != 0) 800 return (error); 801 if (in6_addr2zoneid(ifp, &dst6.sin6_addr, &scopeid)) 802 return (EINVAL); 803 if (dst6.sin6_scope_id == 0) /* user omit to specify the ID. */ 804 dst6.sin6_scope_id = scopeid; 805 else if (dst6.sin6_scope_id != scopeid) 806 return (EINVAL); /* scope ID mismatch. */ 807 if ((error = in6_embedscope(&dst6.sin6_addr, &dst6, NULL, NULL)) 808 != 0) 809 return (error); 810 dst6.sin6_scope_id = 0; /* XXX */ 811 } 812 /* 813 * The destination address can be specified only for a p2p or a 814 * loopback interface. If specified, the corresponding prefix length 815 * must be 128. 816 */ 817 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 818 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 819 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 820 "be specified for a p2p or a loopback IF only\n")); 821 return (EINVAL); 822 } 823 if (plen != 128) { 824 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 825 "be 128 when dstaddr is specified\n")); 826 return (EINVAL); 827 } 828 } 829 /* lifetime consistency check */ 830 lt = &ifra->ifra_lifetime; 831 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME 832 && lt->ia6t_vltime + time_second < time_second) { 833 return EINVAL; 834 } 835 if (lt->ia6t_vltime == 0) { 836 /* 837 * the following log might be noisy, but this is a typical 838 * configuration mistake or a tool's bug. 839 */ 840 nd6log((LOG_INFO, 841 "in6_update_ifa: valid lifetime is 0 for %s\n", 842 ip6_sprintf(&ifra->ifra_addr.sin6_addr))); 843 } 844 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME 845 && lt->ia6t_pltime + time_second < time_second) { 846 return EINVAL; 847 } 848 849 /* 850 * If this is a new address, allocate a new ifaddr and link it 851 * into chains. 852 */ 853 if (ia == NULL) { 854 hostIsNew = 1; 855 /* 856 * When in6_update_ifa() is called in a process of a received 857 * RA, it is called under an interrupt context. So, we should 858 * call malloc with M_NOWAIT. 859 */ 860 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR, 861 M_NOWAIT); 862 if (ia == NULL) 863 return (ENOBUFS); 864 bzero((caddr_t)ia, sizeof(*ia)); 865 /* Initialize the address and masks */ 866 IFA_LOCK_INIT(&ia->ia_ifa); 867 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 868 ia->ia_addr.sin6_family = AF_INET6; 869 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 870 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 871 /* 872 * XXX: some functions expect that ifa_dstaddr is not 873 * NULL for p2p interfaces. 874 */ 875 ia->ia_ifa.ifa_dstaddr = 876 (struct sockaddr *)&ia->ia_dstaddr; 877 } else { 878 ia->ia_ifa.ifa_dstaddr = NULL; 879 } 880 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 881 882 ia->ia_ifp = ifp; 883 if ((oia = in6_ifaddr) != NULL) { 884 for ( ; oia->ia_next; oia = oia->ia_next) 885 continue; 886 oia->ia_next = ia; 887 } else 888 in6_ifaddr = ia; 889 890 ia->ia_ifa.ifa_refcnt = 1; 891 TAILQ_INSERT_TAIL(&ifp->if_addrlist, &ia->ia_ifa, ifa_list); 892 } 893 894 /* set prefix mask */ 895 if (ifra->ifra_prefixmask.sin6_len) { 896 /* 897 * We prohibit changing the prefix length of an existing 898 * address, because 899 * + such an operation should be rare in IPv6, and 900 * + the operation would confuse prefix management. 901 */ 902 if (ia->ia_prefixmask.sin6_len && 903 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 904 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an" 905 " existing (%s) address should not be changed\n", 906 ip6_sprintf(&ia->ia_addr.sin6_addr))); 907 error = EINVAL; 908 goto unlink; 909 } 910 ia->ia_prefixmask = ifra->ifra_prefixmask; 911 } 912 913 /* 914 * If a new destination address is specified, scrub the old one and 915 * install the new destination. Note that the interface must be 916 * p2p or loopback (see the check above.) 917 */ 918 if (dst6.sin6_family == AF_INET6 && 919 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 920 int e; 921 922 if ((ia->ia_flags & IFA_ROUTE) != 0 && 923 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) { 924 nd6log((LOG_ERR, "in6_update_ifa: failed to remove " 925 "a route to the old destination: %s\n", 926 ip6_sprintf(&ia->ia_addr.sin6_addr))); 927 /* proceed anyway... */ 928 } else 929 ia->ia_flags &= ~IFA_ROUTE; 930 ia->ia_dstaddr = dst6; 931 } 932 933 /* reset the interface and routing table appropriately. */ 934 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 935 goto unlink; 936 937 /* 938 * Beyond this point, we should call in6_purgeaddr upon an error, 939 * not just go to unlink. 940 */ 941 942 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 943 struct sockaddr_in6 mltaddr, mltmask; 944 struct in6_multi *in6m; 945 946 if (hostIsNew) { 947 /* join solicited multicast addr for new host id */ 948 struct in6_addr llsol; 949 950 bzero(&llsol, sizeof(struct in6_addr)); 951 llsol.s6_addr16[0] = htons(0xff02); 952 llsol.s6_addr16[1] = htons(ifp->if_index); 953 llsol.s6_addr32[1] = 0; 954 llsol.s6_addr32[2] = htonl(1); 955 llsol.s6_addr32[3] = 956 ifra->ifra_addr.sin6_addr.s6_addr32[3]; 957 llsol.s6_addr8[12] = 0xff; 958 (void)in6_addmulti(&llsol, ifp, &error); 959 if (error != 0) { 960 nd6log((LOG_WARNING, 961 "in6_update_ifa: addmulti failed for " 962 "%s on %s (errno=%d)\n", 963 ip6_sprintf(&llsol), if_name(ifp), 964 error)); 965 in6_purgeaddr((struct ifaddr *)ia); 966 return (error); 967 } 968 } 969 970 bzero(&mltmask, sizeof(mltmask)); 971 mltmask.sin6_len = sizeof(struct sockaddr_in6); 972 mltmask.sin6_family = AF_INET6; 973 mltmask.sin6_addr = in6mask32; 974 975 /* 976 * join link-local all-nodes address 977 */ 978 bzero(&mltaddr, sizeof(mltaddr)); 979 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 980 mltaddr.sin6_family = AF_INET6; 981 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 982 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 983 984 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 985 if (in6m == NULL) { 986 rtrequest(RTM_ADD, 987 (struct sockaddr *)&mltaddr, 988 (struct sockaddr *)&ia->ia_addr, 989 (struct sockaddr *)&mltmask, 990 RTF_UP|RTF_CLONING, /* xxx */ 991 (struct rtentry **)0); 992 (void)in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 993 if (error != 0) { 994 nd6log((LOG_WARNING, 995 "in6_update_ifa: addmulti failed for " 996 "%s on %s (errno=%d)\n", 997 ip6_sprintf(&mltaddr.sin6_addr), 998 if_name(ifp), error)); 999 } 1000 } 1001 1002 /* 1003 * join node information group address 1004 */ 1005#define hostnamelen strlen(hostname) 1006 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr.sin6_addr) 1007 == 0) { 1008 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1009 if (in6m == NULL && ia != NULL) { 1010 (void)in6_addmulti(&mltaddr.sin6_addr, 1011 ifp, &error); 1012 if (error != 0) { 1013 nd6log((LOG_WARNING, "in6_update_ifa: " 1014 "addmulti failed for " 1015 "%s on %s (errno=%d)\n", 1016 ip6_sprintf(&mltaddr.sin6_addr), 1017 if_name(ifp), error)); 1018 } 1019 } 1020 } 1021#undef hostnamelen 1022 1023 /* 1024 * join node-local all-nodes address, on loopback. 1025 * XXX: since "node-local" is obsoleted by interface-local, 1026 * we have to join the group on every interface with 1027 * some interface-boundary restriction. 1028 */ 1029 if (ifp->if_flags & IFF_LOOPBACK) { 1030 struct in6_ifaddr *ia_loop; 1031 1032 struct in6_addr loop6 = in6addr_loopback; 1033 ia_loop = in6ifa_ifpwithaddr(ifp, &loop6); 1034 1035 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1036 1037 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 1038 if (in6m == NULL && ia_loop != NULL) { 1039 rtrequest(RTM_ADD, 1040 (struct sockaddr *)&mltaddr, 1041 (struct sockaddr *)&ia_loop->ia_addr, 1042 (struct sockaddr *)&mltmask, 1043 RTF_UP, 1044 (struct rtentry **)0); 1045 (void)in6_addmulti(&mltaddr.sin6_addr, ifp, 1046 &error); 1047 if (error != 0) { 1048 nd6log((LOG_WARNING, "in6_update_ifa: " 1049 "addmulti failed for %s on %s " 1050 "(errno=%d)\n", 1051 ip6_sprintf(&mltaddr.sin6_addr), 1052 if_name(ifp), error)); 1053 } 1054 } 1055 } 1056 } 1057 1058 ia->ia6_flags = ifra->ifra_flags; 1059 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /*safety*/ 1060 ia->ia6_flags &= ~IN6_IFF_NODAD; /* Mobile IPv6 */ 1061 1062 ia->ia6_lifetime = ifra->ifra_lifetime; 1063 /* for sanity */ 1064 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1065 ia->ia6_lifetime.ia6t_expire = 1066 time_second + ia->ia6_lifetime.ia6t_vltime; 1067 } else 1068 ia->ia6_lifetime.ia6t_expire = 0; 1069 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1070 ia->ia6_lifetime.ia6t_preferred = 1071 time_second + ia->ia6_lifetime.ia6t_pltime; 1072 } else 1073 ia->ia6_lifetime.ia6t_preferred = 0; 1074 1075 /* 1076 * Perform DAD, if needed. 1077 * XXX It may be of use, if we can administratively 1078 * disable DAD. 1079 */ 1080 if (in6if_do_dad(ifp) && (ifra->ifra_flags & IN6_IFF_NODAD) == 0) { 1081 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1082 nd6_dad_start((struct ifaddr *)ia, NULL); 1083 } 1084 1085 return (error); 1086 1087 unlink: 1088 /* 1089 * XXX: if a change of an existing address failed, keep the entry 1090 * anyway. 1091 */ 1092 if (hostIsNew) 1093 in6_unlink_ifa(ia, ifp); 1094 return (error); 1095} 1096 1097void 1098in6_purgeaddr(ifa) 1099 struct ifaddr *ifa; 1100{ 1101 struct ifnet *ifp = ifa->ifa_ifp; 1102 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1103 1104 /* stop DAD processing */ 1105 nd6_dad_stop(ifa); 1106 1107 /* 1108 * delete route to the destination of the address being purged. 1109 * The interface must be p2p or loopback in this case. 1110 */ 1111 if ((ia->ia_flags & IFA_ROUTE) != 0 && ia->ia_dstaddr.sin6_len != 0) { 1112 int e; 1113 1114 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 1115 != 0) { 1116 log(LOG_ERR, "in6_purgeaddr: failed to remove " 1117 "a route to the p2p destination: %s on %s, " 1118 "errno=%d\n", 1119 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp), 1120 e); 1121 /* proceed anyway... */ 1122 } else 1123 ia->ia_flags &= ~IFA_ROUTE; 1124 } 1125 1126 /* Remove ownaddr's loopback rtentry, if it exists. */ 1127 in6_ifremloop(&(ia->ia_ifa)); 1128 1129 if (ifp->if_flags & IFF_MULTICAST) { 1130 /* 1131 * delete solicited multicast addr for deleting host id 1132 */ 1133 struct in6_multi *in6m; 1134 struct in6_addr llsol; 1135 bzero(&llsol, sizeof(struct in6_addr)); 1136 llsol.s6_addr16[0] = htons(0xff02); 1137 llsol.s6_addr16[1] = htons(ifp->if_index); 1138 llsol.s6_addr32[1] = 0; 1139 llsol.s6_addr32[2] = htonl(1); 1140 llsol.s6_addr32[3] = 1141 ia->ia_addr.sin6_addr.s6_addr32[3]; 1142 llsol.s6_addr8[12] = 0xff; 1143 1144 IN6_LOOKUP_MULTI(llsol, ifp, in6m); 1145 if (in6m) 1146 in6_delmulti(in6m); 1147 } 1148 1149 in6_unlink_ifa(ia, ifp); 1150} 1151 1152static void 1153in6_unlink_ifa(ia, ifp) 1154 struct in6_ifaddr *ia; 1155 struct ifnet *ifp; 1156{ 1157 int plen, iilen; 1158 struct in6_ifaddr *oia; 1159 int s = splnet(); 1160 1161 TAILQ_REMOVE(&ifp->if_addrlist, &ia->ia_ifa, ifa_list); 1162 1163 oia = ia; 1164 if (oia == (ia = in6_ifaddr)) 1165 in6_ifaddr = ia->ia_next; 1166 else { 1167 while (ia->ia_next && (ia->ia_next != oia)) 1168 ia = ia->ia_next; 1169 if (ia->ia_next) 1170 ia->ia_next = oia->ia_next; 1171 else { 1172 /* search failed */ 1173 printf("Couldn't unlink in6_ifaddr from in6_ifaddr\n"); 1174 } 1175 } 1176 1177 if (oia->ia6_ifpr) { /* check for safety */ 1178 plen = in6_mask2len(&oia->ia_prefixmask.sin6_addr, NULL); 1179 iilen = (sizeof(oia->ia_prefixmask.sin6_addr) << 3) - plen; 1180 in6_prefix_remove_ifid(iilen, oia); 1181 } 1182 1183 /* 1184 * When an autoconfigured address is being removed, release the 1185 * reference to the base prefix. Also, since the release might 1186 * affect the status of other (detached) addresses, call 1187 * pfxlist_onlink_check(). 1188 */ 1189 if ((oia->ia6_flags & IN6_IFF_AUTOCONF) != 0) { 1190 if (oia->ia6_ndpr == NULL) { 1191 nd6log((LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address " 1192 "%p has no prefix\n", oia)); 1193 } else { 1194 oia->ia6_ndpr->ndpr_refcnt--; 1195 oia->ia6_flags &= ~IN6_IFF_AUTOCONF; 1196 oia->ia6_ndpr = NULL; 1197 } 1198 1199 pfxlist_onlink_check(); 1200 } 1201 1202 /* 1203 * release another refcnt for the link from in6_ifaddr. 1204 * Note that we should decrement the refcnt at least once for all *BSD. 1205 */ 1206 IFAFREE(&oia->ia_ifa); 1207 1208 splx(s); 1209} 1210 1211void 1212in6_purgeif(ifp) 1213 struct ifnet *ifp; 1214{ 1215 struct ifaddr *ifa, *nifa; 1216 1217 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != NULL; ifa = nifa) { 1218 nifa = TAILQ_NEXT(ifa, ifa_list); 1219 if (ifa->ifa_addr->sa_family != AF_INET6) 1220 continue; 1221 in6_purgeaddr(ifa); 1222 } 1223 1224 in6_ifdetach(ifp); 1225} 1226 1227/* 1228 * SIOC[GAD]LIFADDR. 1229 * SIOCGLIFADDR: get first address. (?) 1230 * SIOCGLIFADDR with IFLR_PREFIX: 1231 * get first address that matches the specified prefix. 1232 * SIOCALIFADDR: add the specified address. 1233 * SIOCALIFADDR with IFLR_PREFIX: 1234 * add the specified prefix, filling hostid part from 1235 * the first link-local address. prefixlen must be <= 64. 1236 * SIOCDLIFADDR: delete the specified address. 1237 * SIOCDLIFADDR with IFLR_PREFIX: 1238 * delete the first address that matches the specified prefix. 1239 * return values: 1240 * EINVAL on invalid parameters 1241 * EADDRNOTAVAIL on prefix match failed/specified address not found 1242 * other values may be returned from in6_ioctl() 1243 * 1244 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1245 * this is to accomodate address naming scheme other than RFC2374, 1246 * in the future. 1247 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1248 * address encoding scheme. (see figure on page 8) 1249 */ 1250static int 1251in6_lifaddr_ioctl(so, cmd, data, ifp, td) 1252 struct socket *so; 1253 u_long cmd; 1254 caddr_t data; 1255 struct ifnet *ifp; 1256 struct thread *td; 1257{ 1258 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1259 struct ifaddr *ifa; 1260 struct sockaddr *sa; 1261 1262 /* sanity checks */ 1263 if (!data || !ifp) { 1264 panic("invalid argument to in6_lifaddr_ioctl"); 1265 /* NOTREACHED */ 1266 } 1267 1268 switch (cmd) { 1269 case SIOCGLIFADDR: 1270 /* address must be specified on GET with IFLR_PREFIX */ 1271 if ((iflr->flags & IFLR_PREFIX) == 0) 1272 break; 1273 /* FALLTHROUGH */ 1274 case SIOCALIFADDR: 1275 case SIOCDLIFADDR: 1276 /* address must be specified on ADD and DELETE */ 1277 sa = (struct sockaddr *)&iflr->addr; 1278 if (sa->sa_family != AF_INET6) 1279 return EINVAL; 1280 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1281 return EINVAL; 1282 /* XXX need improvement */ 1283 sa = (struct sockaddr *)&iflr->dstaddr; 1284 if (sa->sa_family && sa->sa_family != AF_INET6) 1285 return EINVAL; 1286 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1287 return EINVAL; 1288 break; 1289 default: /* shouldn't happen */ 1290#if 0 1291 panic("invalid cmd to in6_lifaddr_ioctl"); 1292 /* NOTREACHED */ 1293#else 1294 return EOPNOTSUPP; 1295#endif 1296 } 1297 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) 1298 return EINVAL; 1299 1300 switch (cmd) { 1301 case SIOCALIFADDR: 1302 { 1303 struct in6_aliasreq ifra; 1304 struct in6_addr *hostid = NULL; 1305 int prefixlen; 1306 1307 if ((iflr->flags & IFLR_PREFIX) != 0) { 1308 struct sockaddr_in6 *sin6; 1309 1310 /* 1311 * hostid is to fill in the hostid part of the 1312 * address. hostid points to the first link-local 1313 * address attached to the interface. 1314 */ 1315 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1316 if (!ifa) 1317 return EADDRNOTAVAIL; 1318 hostid = IFA_IN6(ifa); 1319 1320 /* prefixlen must be <= 64. */ 1321 if (64 < iflr->prefixlen) 1322 return EINVAL; 1323 prefixlen = iflr->prefixlen; 1324 1325 /* hostid part must be zero. */ 1326 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1327 if (sin6->sin6_addr.s6_addr32[2] != 0 1328 || sin6->sin6_addr.s6_addr32[3] != 0) { 1329 return EINVAL; 1330 } 1331 } else 1332 prefixlen = iflr->prefixlen; 1333 1334 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1335 bzero(&ifra, sizeof(ifra)); 1336 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name)); 1337 1338 bcopy(&iflr->addr, &ifra.ifra_addr, 1339 ((struct sockaddr *)&iflr->addr)->sa_len); 1340 if (hostid) { 1341 /* fill in hostid part */ 1342 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1343 hostid->s6_addr32[2]; 1344 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1345 hostid->s6_addr32[3]; 1346 } 1347 1348 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1349 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1350 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1351 if (hostid) { 1352 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1353 hostid->s6_addr32[2]; 1354 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1355 hostid->s6_addr32[3]; 1356 } 1357 } 1358 1359 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1360 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1361 1362 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1363 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td); 1364 } 1365 case SIOCGLIFADDR: 1366 case SIOCDLIFADDR: 1367 { 1368 struct in6_ifaddr *ia; 1369 struct in6_addr mask, candidate, match; 1370 struct sockaddr_in6 *sin6; 1371 int cmp; 1372 1373 bzero(&mask, sizeof(mask)); 1374 if (iflr->flags & IFLR_PREFIX) { 1375 /* lookup a prefix rather than address. */ 1376 in6_prefixlen2mask(&mask, iflr->prefixlen); 1377 1378 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1379 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1380 match.s6_addr32[0] &= mask.s6_addr32[0]; 1381 match.s6_addr32[1] &= mask.s6_addr32[1]; 1382 match.s6_addr32[2] &= mask.s6_addr32[2]; 1383 match.s6_addr32[3] &= mask.s6_addr32[3]; 1384 1385 /* if you set extra bits, that's wrong */ 1386 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1387 return EINVAL; 1388 1389 cmp = 1; 1390 } else { 1391 if (cmd == SIOCGLIFADDR) { 1392 /* on getting an address, take the 1st match */ 1393 cmp = 0; /* XXX */ 1394 } else { 1395 /* on deleting an address, do exact match */ 1396 in6_prefixlen2mask(&mask, 128); 1397 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1398 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1399 1400 cmp = 1; 1401 } 1402 } 1403 1404 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1405 if (ifa->ifa_addr->sa_family != AF_INET6) 1406 continue; 1407 if (!cmp) 1408 break; 1409 1410 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1411 /* 1412 * XXX: this is adhoc, but is necessary to allow 1413 * a user to specify fe80::/64 (not /10) for a 1414 * link-local address. 1415 */ 1416 if (IN6_IS_ADDR_LINKLOCAL(&candidate)) 1417 candidate.s6_addr16[1] = 0; 1418 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1419 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1420 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1421 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1422 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1423 break; 1424 } 1425 if (!ifa) 1426 return EADDRNOTAVAIL; 1427 ia = ifa2ia6(ifa); 1428 1429 if (cmd == SIOCGLIFADDR) { 1430 struct sockaddr_in6 *s6; 1431 1432 /* fill in the if_laddrreq structure */ 1433 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1434 s6 = (struct sockaddr_in6 *)&iflr->addr; 1435 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) { 1436 s6->sin6_addr.s6_addr16[1] = 0; 1437 if (in6_addr2zoneid(ifp, &s6->sin6_addr, 1438 &s6->sin6_scope_id)) 1439 return (EINVAL);/* XXX */ 1440 } 1441 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1442 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1443 ia->ia_dstaddr.sin6_len); 1444 s6 = (struct sockaddr_in6 *)&iflr->dstaddr; 1445 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) { 1446 s6->sin6_addr.s6_addr16[1] = 0; 1447 if (in6_addr2zoneid(ifp, 1448 &s6->sin6_addr, &s6->sin6_scope_id)) 1449 return (EINVAL); /* EINVAL */ 1450 } 1451 } else 1452 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1453 1454 iflr->prefixlen = 1455 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1456 1457 iflr->flags = ia->ia6_flags; /* XXX */ 1458 1459 return 0; 1460 } else { 1461 struct in6_aliasreq ifra; 1462 1463 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1464 bzero(&ifra, sizeof(ifra)); 1465 bcopy(iflr->iflr_name, ifra.ifra_name, 1466 sizeof(ifra.ifra_name)); 1467 1468 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1469 ia->ia_addr.sin6_len); 1470 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1471 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1472 ia->ia_dstaddr.sin6_len); 1473 } else { 1474 bzero(&ifra.ifra_dstaddr, 1475 sizeof(ifra.ifra_dstaddr)); 1476 } 1477 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1478 ia->ia_prefixmask.sin6_len); 1479 1480 ifra.ifra_flags = ia->ia6_flags; 1481 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, 1482 ifp, td); 1483 } 1484 } 1485 } 1486 1487 return EOPNOTSUPP; /* just for safety */ 1488} 1489 1490/* 1491 * Initialize an interface's intetnet6 address 1492 * and routing table entry. 1493 */ 1494static int 1495in6_ifinit(ifp, ia, sin6, newhost) 1496 struct ifnet *ifp; 1497 struct in6_ifaddr *ia; 1498 struct sockaddr_in6 *sin6; 1499 int newhost; 1500{ 1501 int error = 0, plen, ifacount = 0; 1502 int s = splimp(); 1503 struct ifaddr *ifa; 1504 1505 /* 1506 * Give the interface a chance to initialize 1507 * if this is its first address, 1508 * and to validate the address if necessary. 1509 */ 1510 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1511 if (ifa->ifa_addr == NULL) 1512 continue; /* just for safety */ 1513 if (ifa->ifa_addr->sa_family != AF_INET6) 1514 continue; 1515 ifacount++; 1516 } 1517 1518 ia->ia_addr = *sin6; 1519 1520 if (ifacount <= 1 && ifp->if_ioctl && 1521 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) { 1522 splx(s); 1523 return (error); 1524 } 1525 splx(s); 1526 1527 ia->ia_ifa.ifa_metric = ifp->if_metric; 1528 1529 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1530 1531 /* 1532 * Special case: 1533 * If a new destination address is specified for a point-to-point 1534 * interface, install a route to the destination as an interface 1535 * direct route. 1536 * XXX: the logic below rejects assigning multiple addresses on a p2p 1537 * interface that share a same destination. 1538 */ 1539 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1540 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 && 1541 ia->ia_dstaddr.sin6_family == AF_INET6) { 1542 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, 1543 RTF_UP | RTF_HOST)) != 0) 1544 return (error); 1545 ia->ia_flags |= IFA_ROUTE; 1546 } 1547 if (plen < 128) { 1548 /* 1549 * The RTF_CLONING flag is necessary for in6_is_ifloop_auto(). 1550 */ 1551 ia->ia_ifa.ifa_flags |= RTF_CLONING; 1552 } 1553 1554 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1555 if (newhost) { 1556 /* set the rtrequest function to create llinfo */ 1557 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1558 in6_ifaddloop(&(ia->ia_ifa)); 1559 } 1560 1561 return (error); 1562} 1563 1564/* 1565 * Add an address to the list of IP6 multicast addresses for a 1566 * given interface. 1567 */ 1568struct in6_multi * 1569in6_addmulti(maddr6, ifp, errorp) 1570 struct in6_addr *maddr6; 1571 struct ifnet *ifp; 1572 int *errorp; 1573{ 1574 struct in6_multi *in6m; 1575 struct sockaddr_in6 sin6; 1576 struct ifmultiaddr *ifma; 1577 int s = splnet(); 1578 1579 *errorp = 0; 1580 1581 /* 1582 * Call generic routine to add membership or increment 1583 * refcount. It wants addresses in the form of a sockaddr, 1584 * so we build one here (being careful to zero the unused bytes). 1585 */ 1586 bzero(&sin6, sizeof sin6); 1587 sin6.sin6_family = AF_INET6; 1588 sin6.sin6_len = sizeof sin6; 1589 sin6.sin6_addr = *maddr6; 1590 *errorp = if_addmulti(ifp, (struct sockaddr *)&sin6, &ifma); 1591 if (*errorp) { 1592 splx(s); 1593 return 0; 1594 } 1595 1596 /* 1597 * If ifma->ifma_protospec is null, then if_addmulti() created 1598 * a new record. Otherwise, we are done. 1599 */ 1600 if (ifma->ifma_protospec != 0) 1601 return ifma->ifma_protospec; 1602 1603 /* XXX - if_addmulti uses M_WAITOK. Can this really be called 1604 at interrupt time? If so, need to fix if_addmulti. XXX */ 1605 in6m = (struct in6_multi *)malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT); 1606 if (in6m == NULL) { 1607 splx(s); 1608 return (NULL); 1609 } 1610 1611 bzero(in6m, sizeof *in6m); 1612 in6m->in6m_addr = *maddr6; 1613 in6m->in6m_ifp = ifp; 1614 in6m->in6m_ifma = ifma; 1615 ifma->ifma_protospec = in6m; 1616 LIST_INSERT_HEAD(&in6_multihead, in6m, in6m_entry); 1617 1618 /* 1619 * Let MLD6 know that we have joined a new IPv6 multicast 1620 * group. 1621 */ 1622 mld6_start_listening(in6m); 1623 splx(s); 1624 return (in6m); 1625} 1626 1627/* 1628 * Delete a multicast address record. 1629 */ 1630void 1631in6_delmulti(in6m) 1632 struct in6_multi *in6m; 1633{ 1634 struct ifmultiaddr *ifma = in6m->in6m_ifma; 1635 int s = splnet(); 1636 1637 if (ifma->ifma_refcount == 1) { 1638 /* 1639 * No remaining claims to this record; let MLD6 know 1640 * that we are leaving the multicast group. 1641 */ 1642 mld6_stop_listening(in6m); 1643 ifma->ifma_protospec = 0; 1644 LIST_REMOVE(in6m, in6m_entry); 1645 free(in6m, M_IPMADDR); 1646 } 1647 /* XXX - should be separate API for when we have an ifma? */ 1648 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1649 splx(s); 1650} 1651 1652/* 1653 * Find an IPv6 interface link-local address specific to an interface. 1654 */ 1655struct in6_ifaddr * 1656in6ifa_ifpforlinklocal(ifp, ignoreflags) 1657 struct ifnet *ifp; 1658 int ignoreflags; 1659{ 1660 struct ifaddr *ifa; 1661 1662 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1663 if (ifa->ifa_addr == NULL) 1664 continue; /* just for safety */ 1665 if (ifa->ifa_addr->sa_family != AF_INET6) 1666 continue; 1667 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1668 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1669 ignoreflags) != 0) 1670 continue; 1671 break; 1672 } 1673 } 1674 1675 return ((struct in6_ifaddr *)ifa); 1676} 1677 1678 1679/* 1680 * find the internet address corresponding to a given interface and address. 1681 */ 1682struct in6_ifaddr * 1683in6ifa_ifpwithaddr(ifp, addr) 1684 struct ifnet *ifp; 1685 struct in6_addr *addr; 1686{ 1687 struct ifaddr *ifa; 1688 1689 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1690 if (ifa->ifa_addr == NULL) 1691 continue; /* just for safety */ 1692 if (ifa->ifa_addr->sa_family != AF_INET6) 1693 continue; 1694 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1695 break; 1696 } 1697 1698 return ((struct in6_ifaddr *)ifa); 1699} 1700 1701/* 1702 * Convert IP6 address to printable (loggable) representation. 1703 */ 1704static char digits[] = "0123456789abcdef"; 1705static int ip6round = 0; 1706char * 1707ip6_sprintf(addr) 1708 const struct in6_addr *addr; 1709{ 1710 static char ip6buf[8][48]; 1711 int i; 1712 char *cp; 1713 const u_short *a = (const u_short *)addr; 1714 const u_char *d; 1715 int dcolon = 0; 1716 1717 ip6round = (ip6round + 1) & 7; 1718 cp = ip6buf[ip6round]; 1719 1720 for (i = 0; i < 8; i++) { 1721 if (dcolon == 1) { 1722 if (*a == 0) { 1723 if (i == 7) 1724 *cp++ = ':'; 1725 a++; 1726 continue; 1727 } else 1728 dcolon = 2; 1729 } 1730 if (*a == 0) { 1731 if (dcolon == 0 && *(a + 1) == 0) { 1732 if (i == 0) 1733 *cp++ = ':'; 1734 *cp++ = ':'; 1735 dcolon = 1; 1736 } else { 1737 *cp++ = '0'; 1738 *cp++ = ':'; 1739 } 1740 a++; 1741 continue; 1742 } 1743 d = (const u_char *)a; 1744 *cp++ = digits[*d >> 4]; 1745 *cp++ = digits[*d++ & 0xf]; 1746 *cp++ = digits[*d >> 4]; 1747 *cp++ = digits[*d & 0xf]; 1748 *cp++ = ':'; 1749 a++; 1750 } 1751 *--cp = 0; 1752 return (ip6buf[ip6round]); 1753} 1754 1755int 1756in6_localaddr(in6) 1757 struct in6_addr *in6; 1758{ 1759 struct in6_ifaddr *ia; 1760 1761 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1762 return 1; 1763 1764 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1765 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1766 &ia->ia_prefixmask.sin6_addr)) { 1767 return 1; 1768 } 1769 } 1770 1771 return (0); 1772} 1773 1774int 1775in6_is_addr_deprecated(sa6) 1776 struct sockaddr_in6 *sa6; 1777{ 1778 struct in6_ifaddr *ia; 1779 1780 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1781 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1782 &sa6->sin6_addr) && 1783 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) 1784 return (1); /* true */ 1785 1786 /* XXX: do we still have to go thru the rest of the list? */ 1787 } 1788 1789 return (0); /* false */ 1790} 1791 1792/* 1793 * return length of part which dst and src are equal 1794 * hard coding... 1795 */ 1796int 1797in6_matchlen(src, dst) 1798struct in6_addr *src, *dst; 1799{ 1800 int match = 0; 1801 u_char *s = (u_char *)src, *d = (u_char *)dst; 1802 u_char *lim = s + 16, r; 1803 1804 while (s < lim) 1805 if ((r = (*d++ ^ *s++)) != 0) { 1806 while (r < 128) { 1807 match++; 1808 r <<= 1; 1809 } 1810 break; 1811 } else 1812 match += 8; 1813 return match; 1814} 1815 1816/* XXX: to be scope conscious */ 1817int 1818in6_are_prefix_equal(p1, p2, len) 1819 struct in6_addr *p1, *p2; 1820 int len; 1821{ 1822 int bytelen, bitlen; 1823 1824 /* sanity check */ 1825 if (0 > len || len > 128) { 1826 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1827 len); 1828 return (0); 1829 } 1830 1831 bytelen = len / 8; 1832 bitlen = len % 8; 1833 1834 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1835 return (0); 1836 if (bitlen != 0 && 1837 p1->s6_addr[bytelen] >> (8 - bitlen) != 1838 p2->s6_addr[bytelen] >> (8 - bitlen)) 1839 return (0); 1840 1841 return (1); 1842} 1843 1844void 1845in6_prefixlen2mask(maskp, len) 1846 struct in6_addr *maskp; 1847 int len; 1848{ 1849 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1850 int bytelen, bitlen, i; 1851 1852 /* sanity check */ 1853 if (0 > len || len > 128) { 1854 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1855 len); 1856 return; 1857 } 1858 1859 bzero(maskp, sizeof(*maskp)); 1860 bytelen = len / 8; 1861 bitlen = len % 8; 1862 for (i = 0; i < bytelen; i++) 1863 maskp->s6_addr[i] = 0xff; 1864 if (bitlen) 1865 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1866} 1867 1868/* 1869 * return the best address out of the same scope. if no address was 1870 * found, return the first valid address from designated IF. 1871 */ 1872struct in6_ifaddr * 1873in6_ifawithifp(ifp, dst) 1874 struct ifnet *ifp; 1875 struct in6_addr *dst; 1876{ 1877 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 1878 struct ifaddr *ifa; 1879 struct in6_ifaddr *besta = 0; 1880 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 1881 1882 dep[0] = dep[1] = NULL; 1883 1884 /* 1885 * We first look for addresses in the same scope. 1886 * If there is one, return it. 1887 * If two or more, return one which matches the dst longest. 1888 * If none, return one of global addresses assigned other ifs. 1889 */ 1890 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1891 if (ifa->ifa_addr->sa_family != AF_INET6) 1892 continue; 1893 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1894 continue; /* XXX: is there any case to allow anycast? */ 1895 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1896 continue; /* don't use this interface */ 1897 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1898 continue; 1899 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1900 if (ip6_use_deprecated) 1901 dep[0] = (struct in6_ifaddr *)ifa; 1902 continue; 1903 } 1904 1905 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 1906 /* 1907 * call in6_matchlen() as few as possible 1908 */ 1909 if (besta) { 1910 if (blen == -1) 1911 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 1912 tlen = in6_matchlen(IFA_IN6(ifa), dst); 1913 if (tlen > blen) { 1914 blen = tlen; 1915 besta = (struct in6_ifaddr *)ifa; 1916 } 1917 } else 1918 besta = (struct in6_ifaddr *)ifa; 1919 } 1920 } 1921 if (besta) 1922 return (besta); 1923 1924 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1925 if (ifa->ifa_addr->sa_family != AF_INET6) 1926 continue; 1927 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1928 continue; /* XXX: is there any case to allow anycast? */ 1929 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1930 continue; /* don't use this interface */ 1931 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1932 continue; 1933 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1934 if (ip6_use_deprecated) 1935 dep[1] = (struct in6_ifaddr *)ifa; 1936 continue; 1937 } 1938 1939 return (struct in6_ifaddr *)ifa; 1940 } 1941 1942 /* use the last-resort values, that are, deprecated addresses */ 1943 if (dep[0]) 1944 return dep[0]; 1945 if (dep[1]) 1946 return dep[1]; 1947 1948 return NULL; 1949} 1950 1951/* 1952 * perform DAD when interface becomes IFF_UP. 1953 */ 1954void 1955in6_if_up(ifp) 1956 struct ifnet *ifp; 1957{ 1958 struct ifaddr *ifa; 1959 struct in6_ifaddr *ia; 1960 int dad_delay; /* delay ticks before DAD output */ 1961 1962 /* 1963 * special cases, like 6to4, are handled in in6_ifattach 1964 */ 1965 in6_ifattach(ifp, NULL); 1966 1967 dad_delay = 0; 1968 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1969 if (ifa->ifa_addr->sa_family != AF_INET6) 1970 continue; 1971 ia = (struct in6_ifaddr *)ifa; 1972 if (ia->ia6_flags & IN6_IFF_TENTATIVE) 1973 nd6_dad_start(ifa, &dad_delay); 1974 } 1975} 1976 1977int 1978in6if_do_dad(ifp) 1979 struct ifnet *ifp; 1980{ 1981 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 1982 return (0); 1983 1984 switch (ifp->if_type) { 1985#ifdef IFT_DUMMY 1986 case IFT_DUMMY: 1987#endif 1988 case IFT_FAITH: 1989 /* 1990 * These interfaces do not have the IFF_LOOPBACK flag, 1991 * but loop packets back. We do not have to do DAD on such 1992 * interfaces. We should even omit it, because loop-backed 1993 * NS would confuse the DAD procedure. 1994 */ 1995 return (0); 1996 default: 1997 /* 1998 * Our DAD routine requires the interface up and running. 1999 * However, some interfaces can be up before the RUNNING 2000 * status. Additionaly, users may try to assign addresses 2001 * before the interface becomes up (or running). 2002 * We simply skip DAD in such a case as a work around. 2003 * XXX: we should rather mark "tentative" on such addresses, 2004 * and do DAD after the interface becomes ready. 2005 */ 2006 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != 2007 (IFF_UP|IFF_RUNNING)) 2008 return (0); 2009 2010 return (1); 2011 } 2012} 2013 2014/* 2015 * Calculate max IPv6 MTU through all the interfaces and store it 2016 * to in6_maxmtu. 2017 */ 2018void 2019in6_setmaxmtu() 2020{ 2021 unsigned long maxmtu = 0; 2022 struct ifnet *ifp; 2023 2024 IFNET_RLOCK(); 2025 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 2026 /* this function can be called during ifnet initialization */ 2027 if (!ifp->if_afdata[AF_INET6]) 2028 continue; 2029 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2030 IN6_LINKMTU(ifp) > maxmtu) 2031 maxmtu = IN6_LINKMTU(ifp); 2032 } 2033 IFNET_RUNLOCK(); 2034 if (maxmtu) /* update only when maxmtu is positive */ 2035 in6_maxmtu = maxmtu; 2036} 2037 2038void * 2039in6_domifattach(ifp) 2040 struct ifnet *ifp; 2041{ 2042 struct in6_ifextra *ext; 2043 2044 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2045 bzero(ext, sizeof(*ext)); 2046 2047 ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat), 2048 M_IFADDR, M_WAITOK); 2049 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat)); 2050 2051 ext->icmp6_ifstat = 2052 (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat), 2053 M_IFADDR, M_WAITOK); 2054 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat)); 2055 2056 ext->nd_ifinfo = nd6_ifattach(ifp); 2057 ext->scope6_id = scope6_ifattach(ifp); 2058 return ext; 2059} 2060 2061void 2062in6_domifdetach(ifp, aux) 2063 struct ifnet *ifp; 2064 void *aux; 2065{ 2066 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2067 2068 scope6_ifdetach(ext->scope6_id); 2069 nd6_ifdetach(ext->nd_ifinfo); 2070 free(ext->in6_ifstat, M_IFADDR); 2071 free(ext->icmp6_ifstat, M_IFADDR); 2072 free(ext, M_IFADDR); 2073} 2074 2075/* 2076 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2077 * v4 mapped addr or v4 compat addr 2078 */ 2079void 2080in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2081{ 2082 bzero(sin, sizeof(*sin)); 2083 sin->sin_len = sizeof(struct sockaddr_in); 2084 sin->sin_family = AF_INET; 2085 sin->sin_port = sin6->sin6_port; 2086 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2087} 2088 2089/* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2090void 2091in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2092{ 2093 bzero(sin6, sizeof(*sin6)); 2094 sin6->sin6_len = sizeof(struct sockaddr_in6); 2095 sin6->sin6_family = AF_INET6; 2096 sin6->sin6_port = sin->sin_port; 2097 sin6->sin6_addr.s6_addr32[0] = 0; 2098 sin6->sin6_addr.s6_addr32[1] = 0; 2099 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2100 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2101} 2102 2103/* Convert sockaddr_in6 into sockaddr_in. */ 2104void 2105in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2106{ 2107 struct sockaddr_in *sin_p; 2108 struct sockaddr_in6 sin6; 2109 2110 /* 2111 * Save original sockaddr_in6 addr and convert it 2112 * to sockaddr_in. 2113 */ 2114 sin6 = *(struct sockaddr_in6 *)nam; 2115 sin_p = (struct sockaddr_in *)nam; 2116 in6_sin6_2_sin(sin_p, &sin6); 2117} 2118 2119/* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2120void 2121in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2122{ 2123 struct sockaddr_in *sin_p; 2124 struct sockaddr_in6 *sin6_p; 2125 2126 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 2127 M_WAITOK); 2128 sin_p = (struct sockaddr_in *)*nam; 2129 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2130 FREE(*nam, M_SONAME); 2131 *nam = (struct sockaddr *)sin6_p; 2132} 2133