1 /* $NetBSD: in6.c,v 1.156 2010/04/22 20:05:15 dyoung Exp $ */ 2 /* $KAME: in6.c,v 1.198 2001/07/18 09:12:38 itojun 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. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)in.c 8.2 (Berkeley) 11/15/93 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: in6.c,v 1.156 2010/04/22 20:05:15 dyoung Exp $"); 66 67 #include "opt_inet.h" 68 #include "opt_pfil_hooks.h" 69 #include "opt_compat_netbsd.h" 70 71 #include <sys/param.h> 72 #include <sys/ioctl.h> 73 #include <sys/errno.h> 74 #include <sys/malloc.h> 75 #include <sys/socket.h> 76 #include <sys/socketvar.h> 77 #include <sys/sockio.h> 78 #include <sys/systm.h> 79 #include <sys/proc.h> 80 #include <sys/time.h> 81 #include <sys/kernel.h> 82 #include <sys/syslog.h> 83 #include <sys/kauth.h> 84 85 #include <net/if.h> 86 #include <net/if_types.h> 87 #include <net/route.h> 88 #include <net/if_dl.h> 89 90 #include <netinet/in.h> 91 #include <netinet/in_var.h> 92 #include <net/if_ether.h> 93 94 #include <netinet/ip6.h> 95 #include <netinet6/ip6_var.h> 96 #include <netinet6/nd6.h> 97 #include <netinet6/mld6_var.h> 98 #include <netinet6/ip6_mroute.h> 99 #include <netinet6/in6_ifattach.h> 100 #include <netinet6/scope6_var.h> 101 102 #include <net/net_osdep.h> 103 104 #ifdef PFIL_HOOKS 105 #include <net/pfil.h> 106 #endif 107 #ifdef COMPAT_50 108 #include <compat/netinet6/in6_var.h> 109 #endif 110 111 MALLOC_DEFINE(M_IP6OPT, "ip6_options", "IPv6 options"); 112 113 /* enable backward compatibility code for obsoleted ioctls */ 114 #define COMPAT_IN6IFIOCTL 115 116 #ifdef IN6_DEBUG 117 #define IN6_DPRINTF(__fmt, ...) printf(__fmt, __VA_ARGS__) 118 #else 119 #define IN6_DPRINTF(__fmt, ...) do { } while (/*CONSTCOND*/0) 120 #endif /* IN6_DEBUG */ 121 122 /* 123 * Definitions of some constant IP6 addresses. 124 */ 125 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 126 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 127 const struct in6_addr in6addr_nodelocal_allnodes = 128 IN6ADDR_NODELOCAL_ALLNODES_INIT; 129 const struct in6_addr in6addr_linklocal_allnodes = 130 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 131 const struct in6_addr in6addr_linklocal_allrouters = 132 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 133 134 const struct in6_addr in6mask0 = IN6MASK0; 135 const struct in6_addr in6mask32 = IN6MASK32; 136 const struct in6_addr in6mask64 = IN6MASK64; 137 const struct in6_addr in6mask96 = IN6MASK96; 138 const struct in6_addr in6mask128 = IN6MASK128; 139 140 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6, 141 0, 0, IN6ADDR_ANY_INIT, 0}; 142 143 static int in6_lifaddr_ioctl(struct socket *, u_long, void *, 144 struct ifnet *, struct lwp *); 145 static int in6_ifinit(struct ifnet *, struct in6_ifaddr *, 146 const struct sockaddr_in6 *, int); 147 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 148 149 /* 150 * Subroutine for in6_ifaddloop() and in6_ifremloop(). 151 * This routine does actual work. 152 */ 153 static void 154 in6_ifloop_request(int cmd, struct ifaddr *ifa) 155 { 156 struct sockaddr_in6 lo_sa; 157 struct sockaddr_in6 all1_sa; 158 struct rtentry *nrt = NULL; 159 int e; 160 161 sockaddr_in6_init(&all1_sa, &in6mask128, 0, 0, 0); 162 sockaddr_in6_init(&lo_sa, &in6addr_loopback, 0, 0, 0); 163 164 /* 165 * We specify the address itself as the gateway, and set the 166 * RTF_LLINFO flag, so that the corresponding host route would have 167 * the flag, and thus applications that assume traditional behavior 168 * would be happy. Note that we assume the caller of the function 169 * (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest, 170 * which changes the outgoing interface to the loopback interface. 171 */ 172 e = rtrequest(cmd, ifa->ifa_addr, ifa->ifa_addr, 173 (struct sockaddr *)&all1_sa, RTF_UP|RTF_HOST|RTF_LLINFO, &nrt); 174 if (e != 0) { 175 log(LOG_ERR, "in6_ifloop_request: " 176 "%s operation failed for %s (errno=%d)\n", 177 cmd == RTM_ADD ? "ADD" : "DELETE", 178 ip6_sprintf(&((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr), 179 e); 180 } 181 182 /* 183 * Make sure rt_ifa be equal to IFA, the second argument of the 184 * function. 185 * We need this because when we refer to rt_ifa->ia6_flags in 186 * ip6_input, we assume that the rt_ifa points to the address instead 187 * of the loopback address. 188 */ 189 if (cmd == RTM_ADD && nrt && ifa != nrt->rt_ifa) 190 rt_replace_ifa(nrt, ifa); 191 192 /* 193 * Report the addition/removal of the address to the routing socket. 194 * XXX: since we called rtinit for a p2p interface with a destination, 195 * we end up reporting twice in such a case. Should we rather 196 * omit the second report? 197 */ 198 if (nrt) { 199 rt_newaddrmsg(cmd, ifa, e, nrt); 200 if (cmd == RTM_DELETE) { 201 if (nrt->rt_refcnt <= 0) { 202 /* XXX: we should free the entry ourselves. */ 203 nrt->rt_refcnt++; 204 rtfree(nrt); 205 } 206 } else { 207 /* the cmd must be RTM_ADD here */ 208 nrt->rt_refcnt--; 209 } 210 } 211 } 212 213 /* 214 * Add ownaddr as loopback rtentry. We previously add the route only if 215 * necessary (ex. on a p2p link). However, since we now manage addresses 216 * separately from prefixes, we should always add the route. We can't 217 * rely on the cloning mechanism from the corresponding interface route 218 * any more. 219 */ 220 void 221 in6_ifaddloop(struct ifaddr *ifa) 222 { 223 struct rtentry *rt; 224 225 /* If there is no loopback entry, allocate one. */ 226 rt = rtalloc1(ifa->ifa_addr, 0); 227 if (rt == NULL || (rt->rt_flags & RTF_HOST) == 0 || 228 (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) 229 in6_ifloop_request(RTM_ADD, ifa); 230 if (rt != NULL) 231 rt->rt_refcnt--; 232 } 233 234 /* 235 * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(), 236 * if it exists. 237 */ 238 void 239 in6_ifremloop(struct ifaddr *ifa) 240 { 241 struct in6_ifaddr *alt_ia = NULL, *ia; 242 struct rtentry *rt; 243 int ia_count = 0; 244 245 /* 246 * Some of BSD variants do not remove cloned routes 247 * from an interface direct route, when removing the direct route 248 * (see comments in net/net_osdep.h). Even for variants that do remove 249 * cloned routes, they could fail to remove the cloned routes when 250 * we handle multple addresses that share a common prefix. 251 * So, we should remove the route corresponding to the deleted address. 252 */ 253 254 /* 255 * Delete the entry only if exactly one ifaddr matches the 256 * address, ifa->ifa_addr. 257 * 258 * If more than one ifaddr matches, replace the ifaddr in 259 * the routing table, rt_ifa, with a different ifaddr than 260 * the one we are purging, ifa. It is important to do 261 * this, or else the routing table can accumulate dangling 262 * pointers rt->rt_ifa->ifa_ifp to destroyed interfaces, 263 * which will lead to crashes, later. (More than one ifaddr 264 * can match if we assign the same address to multiple---probably 265 * p2p---interfaces.) 266 * 267 * XXX An old comment at this place said, "we should avoid 268 * XXX such a configuration [i.e., interfaces with the same 269 * XXX addressed assigned --ed.] in IPv6...". I do not 270 * XXX agree, especially now that I have fixed the dangling 271 * XXX ifp-pointers bug. 272 */ 273 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 274 if (!IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) 275 continue; 276 if (ia->ia_ifp != ifa->ifa_ifp) 277 alt_ia = ia; 278 if (++ia_count > 1 && alt_ia != NULL) 279 break; 280 } 281 282 if (ia_count == 0) 283 return; 284 285 if ((rt = rtalloc1(ifa->ifa_addr, 0)) == NULL) 286 return; 287 rt->rt_refcnt--; 288 289 /* 290 * Before deleting, check if a corresponding loopbacked 291 * host route surely exists. With this check, we can avoid 292 * deleting an interface direct route whose destination is 293 * the same as the address being removed. This can happen 294 * when removing a subnet-router anycast address on an 295 * interface attached to a shared medium. 296 */ 297 if ((rt->rt_flags & RTF_HOST) == 0 || 298 (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) 299 return; 300 301 /* If we cannot replace the route's ifaddr with the equivalent 302 * ifaddr of another interface, I believe it is safest to 303 * delete the route. 304 */ 305 if (ia_count == 1 || alt_ia == NULL) 306 in6_ifloop_request(RTM_DELETE, ifa); 307 else 308 rt_replace_ifa(rt, &alt_ia->ia_ifa); 309 } 310 311 int 312 in6_mask2len(struct in6_addr *mask, u_char *lim0) 313 { 314 int x = 0, y; 315 u_char *lim = lim0, *p; 316 317 /* ignore the scope_id part */ 318 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 319 lim = (u_char *)mask + sizeof(*mask); 320 for (p = (u_char *)mask; p < lim; x++, p++) { 321 if (*p != 0xff) 322 break; 323 } 324 y = 0; 325 if (p < lim) { 326 for (y = 0; y < NBBY; y++) { 327 if ((*p & (0x80 >> y)) == 0) 328 break; 329 } 330 } 331 332 /* 333 * when the limit pointer is given, do a stricter check on the 334 * remaining bits. 335 */ 336 if (p < lim) { 337 if (y != 0 && (*p & (0x00ff >> y)) != 0) 338 return -1; 339 for (p = p + 1; p < lim; p++) 340 if (*p != 0) 341 return -1; 342 } 343 344 return x * NBBY + y; 345 } 346 347 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 348 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 349 350 static int 351 in6_control1(struct socket *so, u_long cmd, void *data, struct ifnet *ifp, 352 lwp_t *l) 353 { 354 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 355 struct in6_ifaddr *ia = NULL; 356 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 357 struct sockaddr_in6 *sa6; 358 int error; 359 360 switch (cmd) { 361 /* 362 * XXX: Fix me, once we fix SIOCSIFADDR, SIOCIFDSTADDR, etc. 363 */ 364 case SIOCSIFADDR: 365 case SIOCSIFDSTADDR: 366 #ifdef SIOCSIFCONF_X25 367 case SIOCSIFCONF_X25: 368 #endif 369 return EOPNOTSUPP; 370 case SIOCGETSGCNT_IN6: 371 case SIOCGETMIFCNT_IN6: 372 return mrt6_ioctl(cmd, data); 373 case SIOCGIFADDRPREF: 374 case SIOCSIFADDRPREF: 375 if (ifp == NULL) 376 return EINVAL; 377 return ifaddrpref_ioctl(so, cmd, data, ifp, l); 378 } 379 380 if (ifp == NULL) 381 return EOPNOTSUPP; 382 383 switch (cmd) { 384 case SIOCSNDFLUSH_IN6: 385 case SIOCSPFXFLUSH_IN6: 386 case SIOCSRTRFLUSH_IN6: 387 case SIOCSDEFIFACE_IN6: 388 case SIOCSIFINFO_FLAGS: 389 case SIOCSIFINFO_IN6: 390 /* Privileged. */ 391 /* FALLTHROUGH */ 392 case OSIOCGIFINFO_IN6: 393 case SIOCGIFINFO_IN6: 394 case SIOCGDRLST_IN6: 395 case SIOCGPRLST_IN6: 396 case SIOCGNBRINFO_IN6: 397 case SIOCGDEFIFACE_IN6: 398 return nd6_ioctl(cmd, data, ifp); 399 } 400 401 switch (cmd) { 402 case SIOCSIFPREFIX_IN6: 403 case SIOCDIFPREFIX_IN6: 404 case SIOCAIFPREFIX_IN6: 405 case SIOCCIFPREFIX_IN6: 406 case SIOCSGIFPREFIX_IN6: 407 case SIOCGIFPREFIX_IN6: 408 log(LOG_NOTICE, 409 "prefix ioctls are now invalidated. " 410 "please use ifconfig.\n"); 411 return EOPNOTSUPP; 412 } 413 414 switch (cmd) { 415 case SIOCALIFADDR: 416 case SIOCDLIFADDR: 417 /* Privileged. */ 418 /* FALLTHROUGH */ 419 case SIOCGLIFADDR: 420 return in6_lifaddr_ioctl(so, cmd, data, ifp, l); 421 } 422 423 /* 424 * Find address for this interface, if it exists. 425 * 426 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 427 * only, and used the first interface address as the target of other 428 * operations (without checking ifra_addr). This was because netinet 429 * code/API assumed at most 1 interface address per interface. 430 * Since IPv6 allows a node to assign multiple addresses 431 * on a single interface, we almost always look and check the 432 * presence of ifra_addr, and reject invalid ones here. 433 * It also decreases duplicated code among SIOC*_IN6 operations. 434 */ 435 switch (cmd) { 436 case SIOCAIFADDR_IN6: 437 #ifdef OSIOCAIFADDR_IN6 438 case OSIOCAIFADDR_IN6: 439 #endif 440 #ifdef OSIOCSIFPHYADDR_IN6 441 case OSIOCSIFPHYADDR_IN6: 442 #endif 443 case SIOCSIFPHYADDR_IN6: 444 sa6 = &ifra->ifra_addr; 445 break; 446 case SIOCSIFADDR_IN6: 447 case SIOCGIFADDR_IN6: 448 case SIOCSIFDSTADDR_IN6: 449 case SIOCSIFNETMASK_IN6: 450 case SIOCGIFDSTADDR_IN6: 451 case SIOCGIFNETMASK_IN6: 452 case SIOCDIFADDR_IN6: 453 case SIOCGIFPSRCADDR_IN6: 454 case SIOCGIFPDSTADDR_IN6: 455 case SIOCGIFAFLAG_IN6: 456 case SIOCSNDFLUSH_IN6: 457 case SIOCSPFXFLUSH_IN6: 458 case SIOCSRTRFLUSH_IN6: 459 case SIOCGIFALIFETIME_IN6: 460 #ifdef OSIOCGIFALIFETIME_IN6 461 case OSIOCGIFALIFETIME_IN6: 462 #endif 463 case SIOCGIFSTAT_IN6: 464 case SIOCGIFSTAT_ICMP6: 465 sa6 = &ifr->ifr_addr; 466 break; 467 default: 468 sa6 = NULL; 469 break; 470 } 471 if (sa6 && sa6->sin6_family == AF_INET6) { 472 if (sa6->sin6_scope_id != 0) 473 error = sa6_embedscope(sa6, 0); 474 else 475 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 476 if (error != 0) 477 return error; 478 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 479 } else 480 ia = NULL; 481 482 switch (cmd) { 483 case SIOCSIFADDR_IN6: 484 case SIOCSIFDSTADDR_IN6: 485 case SIOCSIFNETMASK_IN6: 486 /* 487 * Since IPv6 allows a node to assign multiple addresses 488 * on a single interface, SIOCSIFxxx ioctls are deprecated. 489 */ 490 return EINVAL; 491 492 case SIOCDIFADDR_IN6: 493 /* 494 * for IPv4, we look for existing in_ifaddr here to allow 495 * "ifconfig if0 delete" to remove the first IPv4 address on 496 * the interface. For IPv6, as the spec allows multiple 497 * interface address from the day one, we consider "remove the 498 * first one" semantics to be not preferable. 499 */ 500 if (ia == NULL) 501 return EADDRNOTAVAIL; 502 /* FALLTHROUGH */ 503 #ifdef OSIOCAIFADDR_IN6 504 case OSIOCAIFADDR_IN6: 505 #endif 506 case SIOCAIFADDR_IN6: 507 /* 508 * We always require users to specify a valid IPv6 address for 509 * the corresponding operation. 510 */ 511 if (ifra->ifra_addr.sin6_family != AF_INET6 || 512 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) 513 return EAFNOSUPPORT; 514 /* Privileged. */ 515 516 break; 517 518 case SIOCGIFADDR_IN6: 519 /* This interface is basically deprecated. use SIOCGIFCONF. */ 520 /* FALLTHROUGH */ 521 case SIOCGIFAFLAG_IN6: 522 case SIOCGIFNETMASK_IN6: 523 case SIOCGIFDSTADDR_IN6: 524 case SIOCGIFALIFETIME_IN6: 525 #ifdef OSIOCGIFALIFETIME_IN6 526 case OSIOCGIFALIFETIME_IN6: 527 #endif 528 /* must think again about its semantics */ 529 if (ia == NULL) 530 return EADDRNOTAVAIL; 531 break; 532 } 533 534 switch (cmd) { 535 536 case SIOCGIFADDR_IN6: 537 ifr->ifr_addr = ia->ia_addr; 538 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 539 return error; 540 break; 541 542 case SIOCGIFDSTADDR_IN6: 543 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 544 return EINVAL; 545 /* 546 * XXX: should we check if ifa_dstaddr is NULL and return 547 * an error? 548 */ 549 ifr->ifr_dstaddr = ia->ia_dstaddr; 550 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 551 return error; 552 break; 553 554 case SIOCGIFNETMASK_IN6: 555 ifr->ifr_addr = ia->ia_prefixmask; 556 break; 557 558 case SIOCGIFAFLAG_IN6: 559 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 560 break; 561 562 case SIOCGIFSTAT_IN6: 563 if (ifp == NULL) 564 return EINVAL; 565 memset(&ifr->ifr_ifru.ifru_stat, 0, 566 sizeof(ifr->ifr_ifru.ifru_stat)); 567 ifr->ifr_ifru.ifru_stat = 568 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat; 569 break; 570 571 case SIOCGIFSTAT_ICMP6: 572 if (ifp == NULL) 573 return EINVAL; 574 memset(&ifr->ifr_ifru.ifru_icmp6stat, 0, 575 sizeof(ifr->ifr_ifru.ifru_icmp6stat)); 576 ifr->ifr_ifru.ifru_icmp6stat = 577 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat; 578 break; 579 580 #ifdef OSIOCGIFALIFETIME_IN6 581 case OSIOCGIFALIFETIME_IN6: 582 #endif 583 case SIOCGIFALIFETIME_IN6: 584 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 585 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 586 time_t maxexpire; 587 struct in6_addrlifetime *retlt = 588 &ifr->ifr_ifru.ifru_lifetime; 589 590 /* 591 * XXX: adjust expiration time assuming time_t is 592 * signed. 593 */ 594 maxexpire = ((time_t)~0) & 595 ~((time_t)1 << ((sizeof(maxexpire) * NBBY) - 1)); 596 if (ia->ia6_lifetime.ia6t_vltime < 597 maxexpire - ia->ia6_updatetime) { 598 retlt->ia6t_expire = ia->ia6_updatetime + 599 ia->ia6_lifetime.ia6t_vltime; 600 } else 601 retlt->ia6t_expire = maxexpire; 602 } 603 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 604 time_t maxexpire; 605 struct in6_addrlifetime *retlt = 606 &ifr->ifr_ifru.ifru_lifetime; 607 608 /* 609 * XXX: adjust expiration time assuming time_t is 610 * signed. 611 */ 612 maxexpire = ((time_t)~0) & 613 ~((time_t)1 << ((sizeof(maxexpire) * NBBY) - 1)); 614 if (ia->ia6_lifetime.ia6t_pltime < 615 maxexpire - ia->ia6_updatetime) { 616 retlt->ia6t_preferred = ia->ia6_updatetime + 617 ia->ia6_lifetime.ia6t_pltime; 618 } else 619 retlt->ia6t_preferred = maxexpire; 620 } 621 #ifdef OSIOCFIFALIFETIME_IN6 622 if (cmd == OSIOCFIFALIFETIME_IN6) 623 in6_addrlifetime_to_in6_addrlifetime50( 624 &ifr->ifru.ifru_lifetime); 625 #endif 626 break; 627 628 #ifdef OSIOCAIFADDR_IN6 629 case OSIOCAIFADDR_IN6: 630 in6_aliasreq50_to_in6_aliasreq(ifra); 631 /*FALLTHROUGH*/ 632 #endif 633 case SIOCAIFADDR_IN6: 634 { 635 int i; 636 struct nd_prefixctl pr0; 637 struct nd_prefix *pr; 638 639 /* reject read-only flags */ 640 if ((ifra->ifra_flags & IN6_IFF_DUPLICATED) != 0 || 641 (ifra->ifra_flags & IN6_IFF_DETACHED) != 0 || 642 (ifra->ifra_flags & IN6_IFF_NODAD) != 0 || 643 (ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0) { 644 return EINVAL; 645 } 646 /* 647 * first, make or update the interface address structure, 648 * and link it to the list. 649 */ 650 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 651 return error; 652 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 653 == NULL) { 654 /* 655 * this can happen when the user specify the 0 valid 656 * lifetime. 657 */ 658 break; 659 } 660 661 /* 662 * then, make the prefix on-link on the interface. 663 * XXX: we'd rather create the prefix before the address, but 664 * we need at least one address to install the corresponding 665 * interface route, so we configure the address first. 666 */ 667 668 /* 669 * convert mask to prefix length (prefixmask has already 670 * been validated in in6_update_ifa(). 671 */ 672 memset(&pr0, 0, sizeof(pr0)); 673 pr0.ndpr_ifp = ifp; 674 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 675 NULL); 676 if (pr0.ndpr_plen == 128) { 677 break; /* we don't need to install a host route. */ 678 } 679 pr0.ndpr_prefix = ifra->ifra_addr; 680 /* apply the mask for safety. */ 681 for (i = 0; i < 4; i++) { 682 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 683 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i]; 684 } 685 /* 686 * XXX: since we don't have an API to set prefix (not address) 687 * lifetimes, we just use the same lifetimes as addresses. 688 * The (temporarily) installed lifetimes can be overridden by 689 * later advertised RAs (when accept_rtadv is non 0), which is 690 * an intended behavior. 691 */ 692 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 693 pr0.ndpr_raf_auto = 694 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 695 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 696 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 697 698 /* add the prefix if not yet. */ 699 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 700 /* 701 * nd6_prelist_add will install the corresponding 702 * interface route. 703 */ 704 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) 705 return error; 706 if (pr == NULL) { 707 log(LOG_ERR, "nd6_prelist_add succeeded but " 708 "no prefix\n"); 709 return EINVAL; /* XXX panic here? */ 710 } 711 } 712 713 /* relate the address to the prefix */ 714 if (ia->ia6_ndpr == NULL) { 715 ia->ia6_ndpr = pr; 716 pr->ndpr_refcnt++; 717 718 /* 719 * If this is the first autoconf address from the 720 * prefix, create a temporary address as well 721 * (when required). 722 */ 723 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 724 ip6_use_tempaddr && pr->ndpr_refcnt == 1) { 725 int e; 726 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 727 log(LOG_NOTICE, "in6_control: failed " 728 "to create a temporary address, " 729 "errno=%d\n", e); 730 } 731 } 732 } 733 734 /* 735 * this might affect the status of autoconfigured addresses, 736 * that is, this address might make other addresses detached. 737 */ 738 pfxlist_onlink_check(); 739 740 #ifdef PFIL_HOOKS 741 (void)pfil_run_hooks(&if_pfil, (struct mbuf **)SIOCAIFADDR_IN6, 742 ifp, PFIL_IFADDR); 743 #endif 744 745 break; 746 } 747 748 case SIOCDIFADDR_IN6: 749 { 750 struct nd_prefix *pr; 751 752 /* 753 * If the address being deleted is the only one that owns 754 * the corresponding prefix, expire the prefix as well. 755 * XXX: theoretically, we don't have to worry about such 756 * relationship, since we separate the address management 757 * and the prefix management. We do this, however, to provide 758 * as much backward compatibility as possible in terms of 759 * the ioctl operation. 760 * Note that in6_purgeaddr() will decrement ndpr_refcnt. 761 */ 762 pr = ia->ia6_ndpr; 763 in6_purgeaddr(&ia->ia_ifa); 764 if (pr && pr->ndpr_refcnt == 0) 765 prelist_remove(pr); 766 #ifdef PFIL_HOOKS 767 (void)pfil_run_hooks(&if_pfil, (struct mbuf **)SIOCDIFADDR_IN6, 768 ifp, PFIL_IFADDR); 769 #endif 770 break; 771 } 772 773 default: 774 return ENOTTY; 775 } 776 777 return 0; 778 } 779 780 int 781 in6_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp, 782 struct lwp *l) 783 { 784 int error, s; 785 786 switch (cmd) { 787 case SIOCSNDFLUSH_IN6: 788 case SIOCSPFXFLUSH_IN6: 789 case SIOCSRTRFLUSH_IN6: 790 case SIOCSDEFIFACE_IN6: 791 case SIOCSIFINFO_FLAGS: 792 case SIOCSIFINFO_IN6: 793 794 case SIOCALIFADDR: 795 case SIOCDLIFADDR: 796 797 case SIOCDIFADDR_IN6: 798 #ifdef OSIOCAIFADDR_IN6 799 case OSIOCAIFADDR_IN6: 800 #endif 801 case SIOCAIFADDR_IN6: 802 if (l == NULL || kauth_authorize_generic(l->l_cred, 803 KAUTH_GENERIC_ISSUSER, NULL)) 804 return EPERM; 805 break; 806 } 807 808 s = splnet(); 809 error = in6_control1(so , cmd, data, ifp, l); 810 splx(s); 811 return error; 812 } 813 814 /* 815 * Update parameters of an IPv6 interface address. 816 * If necessary, a new entry is created and linked into address chains. 817 * This function is separated from in6_control(). 818 * XXX: should this be performed under splnet()? 819 */ 820 static int 821 in6_update_ifa1(struct ifnet *ifp, struct in6_aliasreq *ifra, 822 struct in6_ifaddr *ia, int flags) 823 { 824 int error = 0, hostIsNew = 0, plen = -1; 825 struct in6_ifaddr *oia; 826 struct sockaddr_in6 dst6; 827 struct in6_addrlifetime *lt; 828 struct in6_multi_mship *imm; 829 struct in6_multi *in6m_sol; 830 struct rtentry *rt; 831 int dad_delay; 832 833 in6m_sol = NULL; 834 835 /* Validate parameters */ 836 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 837 return EINVAL; 838 839 /* 840 * The destination address for a p2p link must have a family 841 * of AF_UNSPEC or AF_INET6. 842 */ 843 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 844 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 845 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 846 return EAFNOSUPPORT; 847 /* 848 * validate ifra_prefixmask. don't check sin6_family, netmask 849 * does not carry fields other than sin6_len. 850 */ 851 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 852 return EINVAL; 853 /* 854 * Because the IPv6 address architecture is classless, we require 855 * users to specify a (non 0) prefix length (mask) for a new address. 856 * We also require the prefix (when specified) mask is valid, and thus 857 * reject a non-consecutive mask. 858 */ 859 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 860 return EINVAL; 861 if (ifra->ifra_prefixmask.sin6_len != 0) { 862 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 863 (u_char *)&ifra->ifra_prefixmask + 864 ifra->ifra_prefixmask.sin6_len); 865 if (plen <= 0) 866 return EINVAL; 867 } else { 868 /* 869 * In this case, ia must not be NULL. We just use its prefix 870 * length. 871 */ 872 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 873 } 874 /* 875 * If the destination address on a p2p interface is specified, 876 * and the address is a scoped one, validate/set the scope 877 * zone identifier. 878 */ 879 dst6 = ifra->ifra_dstaddr; 880 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 881 (dst6.sin6_family == AF_INET6)) { 882 struct in6_addr in6_tmp; 883 u_int32_t zoneid; 884 885 in6_tmp = dst6.sin6_addr; 886 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 887 return EINVAL; /* XXX: should be impossible */ 888 889 if (dst6.sin6_scope_id != 0) { 890 if (dst6.sin6_scope_id != zoneid) 891 return EINVAL; 892 } else /* user omit to specify the ID. */ 893 dst6.sin6_scope_id = zoneid; 894 895 /* convert into the internal form */ 896 if (sa6_embedscope(&dst6, 0)) 897 return EINVAL; /* XXX: should be impossible */ 898 } 899 /* 900 * The destination address can be specified only for a p2p or a 901 * loopback interface. If specified, the corresponding prefix length 902 * must be 128. 903 */ 904 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 905 #ifdef FORCE_P2PPLEN 906 int i; 907 #endif 908 909 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 910 /* XXX: noisy message */ 911 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 912 "be specified for a p2p or a loopback IF only\n")); 913 return EINVAL; 914 } 915 if (plen != 128) { 916 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 917 "be 128 when dstaddr is specified\n")); 918 #ifdef FORCE_P2PPLEN 919 /* 920 * To be compatible with old configurations, 921 * such as ifconfig gif0 inet6 2001::1 2001::2 922 * prefixlen 126, we override the specified 923 * prefixmask as if the prefix length was 128. 924 */ 925 ifra->ifra_prefixmask.sin6_len = 926 sizeof(struct sockaddr_in6); 927 for (i = 0; i < 4; i++) 928 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i] = 929 0xffffffff; 930 plen = 128; 931 #else 932 return EINVAL; 933 #endif 934 } 935 } 936 /* lifetime consistency check */ 937 lt = &ifra->ifra_lifetime; 938 if (lt->ia6t_pltime > lt->ia6t_vltime) 939 return EINVAL; 940 if (lt->ia6t_vltime == 0) { 941 /* 942 * the following log might be noisy, but this is a typical 943 * configuration mistake or a tool's bug. 944 */ 945 nd6log((LOG_INFO, 946 "in6_update_ifa: valid lifetime is 0 for %s\n", 947 ip6_sprintf(&ifra->ifra_addr.sin6_addr))); 948 949 if (ia == NULL) 950 return 0; /* there's nothing to do */ 951 } 952 953 /* 954 * If this is a new address, allocate a new ifaddr and link it 955 * into chains. 956 */ 957 if (ia == NULL) { 958 hostIsNew = 1; 959 /* 960 * When in6_update_ifa() is called in a process of a received 961 * RA, it is called under an interrupt context. So, we should 962 * call malloc with M_NOWAIT. 963 */ 964 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR, 965 M_NOWAIT); 966 if (ia == NULL) 967 return ENOBUFS; 968 memset((void *)ia, 0, sizeof(*ia)); 969 LIST_INIT(&ia->ia6_memberships); 970 /* Initialize the address and masks, and put time stamp */ 971 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 972 ia->ia_addr.sin6_family = AF_INET6; 973 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 974 ia->ia6_createtime = time_second; 975 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 976 /* 977 * XXX: some functions expect that ifa_dstaddr is not 978 * NULL for p2p interfaces. 979 */ 980 ia->ia_ifa.ifa_dstaddr = 981 (struct sockaddr *)&ia->ia_dstaddr; 982 } else { 983 ia->ia_ifa.ifa_dstaddr = NULL; 984 } 985 ia->ia_ifa.ifa_netmask = 986 (struct sockaddr *)&ia->ia_prefixmask; 987 988 ia->ia_ifp = ifp; 989 if ((oia = in6_ifaddr) != NULL) { 990 for ( ; oia->ia_next; oia = oia->ia_next) 991 continue; 992 oia->ia_next = ia; 993 } else 994 in6_ifaddr = ia; 995 /* gain a refcnt for the link from in6_ifaddr */ 996 IFAREF(&ia->ia_ifa); 997 998 ifa_insert(ifp, &ia->ia_ifa); 999 } 1000 1001 /* update timestamp */ 1002 ia->ia6_updatetime = time_second; 1003 1004 /* set prefix mask */ 1005 if (ifra->ifra_prefixmask.sin6_len) { 1006 /* 1007 * We prohibit changing the prefix length of an existing 1008 * address, because 1009 * + such an operation should be rare in IPv6, and 1010 * + the operation would confuse prefix management. 1011 */ 1012 if (ia->ia_prefixmask.sin6_len && 1013 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 1014 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an" 1015 " existing (%s) address should not be changed\n", 1016 ip6_sprintf(&ia->ia_addr.sin6_addr))); 1017 error = EINVAL; 1018 goto unlink; 1019 } 1020 ia->ia_prefixmask = ifra->ifra_prefixmask; 1021 } 1022 1023 /* 1024 * If a new destination address is specified, scrub the old one and 1025 * install the new destination. Note that the interface must be 1026 * p2p or loopback (see the check above.) 1027 */ 1028 if (dst6.sin6_family == AF_INET6 && 1029 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1030 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1031 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0) { 1032 nd6log((LOG_ERR, "in6_update_ifa: failed to remove " 1033 "a route to the old destination: %s\n", 1034 ip6_sprintf(&ia->ia_addr.sin6_addr))); 1035 /* proceed anyway... */ 1036 } else 1037 ia->ia_flags &= ~IFA_ROUTE; 1038 ia->ia_dstaddr = dst6; 1039 } 1040 1041 /* 1042 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1043 * to see if the address is deprecated or invalidated, but initialize 1044 * these members for applications. 1045 */ 1046 ia->ia6_lifetime = ifra->ifra_lifetime; 1047 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1048 ia->ia6_lifetime.ia6t_expire = 1049 time_second + ia->ia6_lifetime.ia6t_vltime; 1050 } else 1051 ia->ia6_lifetime.ia6t_expire = 0; 1052 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1053 ia->ia6_lifetime.ia6t_preferred = 1054 time_second + ia->ia6_lifetime.ia6t_pltime; 1055 } else 1056 ia->ia6_lifetime.ia6t_preferred = 0; 1057 1058 /* reset the interface and routing table appropriately. */ 1059 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 1060 goto unlink; 1061 1062 /* 1063 * configure address flags. 1064 */ 1065 ia->ia6_flags = ifra->ifra_flags; 1066 /* 1067 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1068 * userland, make it deprecated. 1069 */ 1070 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1071 ia->ia6_lifetime.ia6t_pltime = 0; 1072 ia->ia6_lifetime.ia6t_preferred = time_second; 1073 } 1074 1075 /* 1076 * Make the address tentative before joining multicast addresses, 1077 * so that corresponding MLD responses would not have a tentative 1078 * source address. 1079 */ 1080 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1081 if (hostIsNew && in6if_do_dad(ifp)) 1082 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1083 1084 /* 1085 * We are done if we have simply modified an existing address. 1086 */ 1087 if (!hostIsNew) 1088 return error; 1089 1090 /* 1091 * Beyond this point, we should call in6_purgeaddr upon an error, 1092 * not just go to unlink. 1093 */ 1094 1095 /* join necessary multicast groups */ 1096 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1097 struct sockaddr_in6 mltaddr, mltmask; 1098 struct in6_addr llsol; 1099 1100 /* join solicited multicast addr for new host id */ 1101 memset(&llsol, 0, sizeof(struct in6_addr)); 1102 llsol.s6_addr16[0] = htons(0xff02); 1103 llsol.s6_addr32[1] = 0; 1104 llsol.s6_addr32[2] = htonl(1); 1105 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 1106 llsol.s6_addr8[12] = 0xff; 1107 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) { 1108 /* XXX: should not happen */ 1109 log(LOG_ERR, "in6_update_ifa: " 1110 "in6_setscope failed\n"); 1111 goto cleanup; 1112 } 1113 dad_delay = 0; 1114 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1115 /* 1116 * We need a random delay for DAD on the address 1117 * being configured. It also means delaying 1118 * transmission of the corresponding MLD report to 1119 * avoid report collision. 1120 * [draft-ietf-ipv6-rfc2462bis-02.txt] 1121 */ 1122 dad_delay = arc4random() % 1123 (MAX_RTR_SOLICITATION_DELAY * hz); 1124 } 1125 1126 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */ 1127 /* join solicited multicast addr for new host id */ 1128 imm = in6_joingroup(ifp, &llsol, &error, dad_delay); 1129 if (!imm) { 1130 nd6log((LOG_ERR, 1131 "in6_update_ifa: addmulti " 1132 "failed for %s on %s (errno=%d)\n", 1133 ip6_sprintf(&llsol), if_name(ifp), error)); 1134 goto cleanup; 1135 } 1136 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1137 in6m_sol = imm->i6mm_maddr; 1138 1139 sockaddr_in6_init(&mltmask, &in6mask32, 0, 0, 0); 1140 1141 /* 1142 * join link-local all-nodes address 1143 */ 1144 sockaddr_in6_init(&mltaddr, &in6addr_linklocal_allnodes, 1145 0, 0, 0); 1146 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1147 goto cleanup; /* XXX: should not fail */ 1148 1149 /* 1150 * XXX: do we really need this automatic routes? 1151 * We should probably reconsider this stuff. Most applications 1152 * actually do not need the routes, since they usually specify 1153 * the outgoing interface. 1154 */ 1155 rt = rtalloc1((struct sockaddr *)&mltaddr, 0); 1156 if (rt) { 1157 if (memcmp(&mltaddr.sin6_addr, 1158 &satocsin6(rt_getkey(rt))->sin6_addr, 1159 MLTMASK_LEN)) { 1160 RTFREE(rt); 1161 rt = NULL; 1162 } else if (rt->rt_ifp != ifp) { 1163 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 1164 "network %04x:%04x::/32 = %04x:%04x::/32\n", 1165 __func__, rt->rt_ifp, ifp, ifp->if_xname, 1166 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 1167 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 1168 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 1169 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 1170 rt_replace_ifa(rt, &ia->ia_ifa); 1171 rt->rt_ifp = ifp; 1172 } 1173 } 1174 if (!rt) { 1175 struct rt_addrinfo info; 1176 1177 memset(&info, 0, sizeof(info)); 1178 info.rti_info[RTAX_DST] = (struct sockaddr *)&mltaddr; 1179 info.rti_info[RTAX_GATEWAY] = 1180 (struct sockaddr *)&ia->ia_addr; 1181 info.rti_info[RTAX_NETMASK] = 1182 (struct sockaddr *)&mltmask; 1183 info.rti_info[RTAX_IFA] = 1184 (struct sockaddr *)&ia->ia_addr; 1185 /* XXX: we need RTF_CLONING to fake nd6_rtrequest */ 1186 info.rti_flags = RTF_UP | RTF_CLONING; 1187 error = rtrequest1(RTM_ADD, &info, NULL); 1188 if (error) 1189 goto cleanup; 1190 } else { 1191 RTFREE(rt); 1192 } 1193 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1194 if (!imm) { 1195 nd6log((LOG_WARNING, 1196 "in6_update_ifa: addmulti failed for " 1197 "%s on %s (errno=%d)\n", 1198 ip6_sprintf(&mltaddr.sin6_addr), 1199 if_name(ifp), error)); 1200 goto cleanup; 1201 } 1202 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1203 1204 /* 1205 * join node information group address 1206 */ 1207 dad_delay = 0; 1208 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1209 /* 1210 * The spec doesn't say anything about delay for this 1211 * group, but the same logic should apply. 1212 */ 1213 dad_delay = arc4random() % 1214 (MAX_RTR_SOLICITATION_DELAY * hz); 1215 } 1216 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr) != 0) 1217 ; 1218 else if ((imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 1219 dad_delay)) == NULL) { /* XXX jinmei */ 1220 nd6log((LOG_WARNING, "in6_update_ifa: " 1221 "addmulti failed for %s on %s (errno=%d)\n", 1222 ip6_sprintf(&mltaddr.sin6_addr), 1223 if_name(ifp), error)); 1224 /* XXX not very fatal, go on... */ 1225 } else { 1226 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1227 } 1228 1229 1230 /* 1231 * join interface-local all-nodes address. 1232 * (ff01::1%ifN, and ff01::%ifN/32) 1233 */ 1234 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1235 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1236 goto cleanup; /* XXX: should not fail */ 1237 1238 /* XXX: again, do we really need the route? */ 1239 rt = rtalloc1((struct sockaddr *)&mltaddr, 0); 1240 if (rt) { 1241 /* 32bit came from "mltmask" */ 1242 if (memcmp(&mltaddr.sin6_addr, 1243 &satocsin6(rt_getkey(rt))->sin6_addr, 1244 32 / NBBY)) { 1245 RTFREE(rt); 1246 rt = NULL; 1247 } else if (rt->rt_ifp != ifp) { 1248 IN6_DPRINTF("%s: rt_ifp %p -> %p (%s) " 1249 "network %04x:%04x::/32 = %04x:%04x::/32\n", 1250 __func__, rt->rt_ifp, ifp, ifp->if_xname, 1251 ntohs(mltaddr.sin6_addr.s6_addr16[0]), 1252 ntohs(mltaddr.sin6_addr.s6_addr16[1]), 1253 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[0], 1254 satocsin6(rt_getkey(rt))->sin6_addr.s6_addr16[1]); 1255 rt_replace_ifa(rt, &ia->ia_ifa); 1256 rt->rt_ifp = ifp; 1257 } 1258 } 1259 if (!rt) { 1260 struct rt_addrinfo info; 1261 1262 memset(&info, 0, sizeof(info)); 1263 info.rti_info[RTAX_DST] = (struct sockaddr *)&mltaddr; 1264 info.rti_info[RTAX_GATEWAY] = 1265 (struct sockaddr *)&ia->ia_addr; 1266 info.rti_info[RTAX_NETMASK] = 1267 (struct sockaddr *)&mltmask; 1268 info.rti_info[RTAX_IFA] = 1269 (struct sockaddr *)&ia->ia_addr; 1270 info.rti_flags = RTF_UP | RTF_CLONING; 1271 error = rtrequest1(RTM_ADD, &info, NULL); 1272 if (error) 1273 goto cleanup; 1274 #undef MLTMASK_LEN 1275 } else { 1276 RTFREE(rt); 1277 } 1278 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1279 if (!imm) { 1280 nd6log((LOG_WARNING, "in6_update_ifa: " 1281 "addmulti failed for %s on %s (errno=%d)\n", 1282 ip6_sprintf(&mltaddr.sin6_addr), 1283 if_name(ifp), error)); 1284 goto cleanup; 1285 } else { 1286 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1287 } 1288 } 1289 1290 /* 1291 * Perform DAD, if needed. 1292 * XXX It may be of use, if we can administratively 1293 * disable DAD. 1294 */ 1295 if (hostIsNew && in6if_do_dad(ifp) && 1296 ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && 1297 (ia->ia6_flags & IN6_IFF_TENTATIVE)) 1298 { 1299 int mindelay, maxdelay; 1300 1301 dad_delay = 0; 1302 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1303 /* 1304 * We need to impose a delay before sending an NS 1305 * for DAD. Check if we also needed a delay for the 1306 * corresponding MLD message. If we did, the delay 1307 * should be larger than the MLD delay (this could be 1308 * relaxed a bit, but this simple logic is at least 1309 * safe). 1310 */ 1311 mindelay = 0; 1312 if (in6m_sol != NULL && 1313 in6m_sol->in6m_state == MLD_REPORTPENDING) { 1314 mindelay = in6m_sol->in6m_timer; 1315 } 1316 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1317 if (maxdelay - mindelay == 0) 1318 dad_delay = 0; 1319 else { 1320 dad_delay = 1321 (arc4random() % (maxdelay - mindelay)) + 1322 mindelay; 1323 } 1324 } 1325 nd6_dad_start(&ia->ia_ifa, dad_delay); 1326 } 1327 1328 return error; 1329 1330 unlink: 1331 /* 1332 * XXX: if a change of an existing address failed, keep the entry 1333 * anyway. 1334 */ 1335 if (hostIsNew) 1336 in6_unlink_ifa(ia, ifp); 1337 return error; 1338 1339 cleanup: 1340 in6_purgeaddr(&ia->ia_ifa); 1341 return error; 1342 } 1343 1344 int 1345 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1346 struct in6_ifaddr *ia, int flags) 1347 { 1348 int rc, s; 1349 1350 s = splnet(); 1351 rc = in6_update_ifa1(ifp, ifra, ia, flags); 1352 splx(s); 1353 return rc; 1354 } 1355 1356 void 1357 in6_purgeaddr(struct ifaddr *ifa) 1358 { 1359 struct ifnet *ifp = ifa->ifa_ifp; 1360 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1361 struct in6_multi_mship *imm; 1362 1363 /* stop DAD processing */ 1364 nd6_dad_stop(ifa); 1365 1366 /* 1367 * delete route to the destination of the address being purged. 1368 * The interface must be p2p or loopback in this case. 1369 */ 1370 if ((ia->ia_flags & IFA_ROUTE) != 0 && ia->ia_dstaddr.sin6_len != 0) { 1371 int e; 1372 1373 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 1374 != 0) { 1375 log(LOG_ERR, "in6_purgeaddr: failed to remove " 1376 "a route to the p2p destination: %s on %s, " 1377 "errno=%d\n", 1378 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp), 1379 e); 1380 /* proceed anyway... */ 1381 } else 1382 ia->ia_flags &= ~IFA_ROUTE; 1383 } 1384 1385 /* Remove ownaddr's loopback rtentry, if it exists. */ 1386 in6_ifremloop(&(ia->ia_ifa)); 1387 1388 /* 1389 * leave from multicast groups we have joined for the interface 1390 */ 1391 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1392 LIST_REMOVE(imm, i6mm_chain); 1393 in6_leavegroup(imm); 1394 } 1395 1396 in6_unlink_ifa(ia, ifp); 1397 } 1398 1399 static void 1400 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1401 { 1402 struct in6_ifaddr *oia; 1403 int s = splnet(); 1404 1405 ifa_remove(ifp, &ia->ia_ifa); 1406 1407 oia = ia; 1408 if (oia == (ia = in6_ifaddr)) 1409 in6_ifaddr = ia->ia_next; 1410 else { 1411 while (ia->ia_next && (ia->ia_next != oia)) 1412 ia = ia->ia_next; 1413 if (ia->ia_next) 1414 ia->ia_next = oia->ia_next; 1415 else { 1416 /* search failed */ 1417 printf("Couldn't unlink in6_ifaddr from in6_ifaddr\n"); 1418 } 1419 } 1420 1421 /* 1422 * XXX thorpej@NetBSD.org -- if the interface is going 1423 * XXX away, don't save the multicast entries, delete them! 1424 */ 1425 if (LIST_EMPTY(&oia->ia6_multiaddrs)) 1426 ; 1427 else if (oia->ia_ifa.ifa_ifp->if_output == if_nulloutput) { 1428 struct in6_multi *in6m, *next; 1429 1430 for (in6m = LIST_FIRST(&oia->ia6_multiaddrs); in6m != NULL; 1431 in6m = next) { 1432 next = LIST_NEXT(in6m, in6m_entry); 1433 in6_delmulti(in6m); 1434 } 1435 } else 1436 in6_savemkludge(oia); 1437 1438 /* 1439 * Release the reference to the base prefix. There should be a 1440 * positive reference. 1441 */ 1442 if (oia->ia6_ndpr == NULL) { 1443 nd6log((LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address " 1444 "%p has no prefix\n", oia)); 1445 } else { 1446 oia->ia6_ndpr->ndpr_refcnt--; 1447 oia->ia6_ndpr = NULL; 1448 } 1449 1450 /* 1451 * Also, if the address being removed is autoconf'ed, call 1452 * pfxlist_onlink_check() since the release might affect the status of 1453 * other (detached) addresses. 1454 */ 1455 if ((oia->ia6_flags & IN6_IFF_AUTOCONF) != 0) 1456 pfxlist_onlink_check(); 1457 1458 /* 1459 * release another refcnt for the link from in6_ifaddr. 1460 * Note that we should decrement the refcnt at least once for all *BSD. 1461 */ 1462 IFAFREE(&oia->ia_ifa); 1463 1464 splx(s); 1465 } 1466 1467 void 1468 in6_purgeif(struct ifnet *ifp) 1469 { 1470 if_purgeaddrs(ifp, AF_INET6, in6_purgeaddr); 1471 1472 in6_ifdetach(ifp); 1473 } 1474 1475 /* 1476 * SIOC[GAD]LIFADDR. 1477 * SIOCGLIFADDR: get first address. (?) 1478 * SIOCGLIFADDR with IFLR_PREFIX: 1479 * get first address that matches the specified prefix. 1480 * SIOCALIFADDR: add the specified address. 1481 * SIOCALIFADDR with IFLR_PREFIX: 1482 * add the specified prefix, filling hostid part from 1483 * the first link-local address. prefixlen must be <= 64. 1484 * SIOCDLIFADDR: delete the specified address. 1485 * SIOCDLIFADDR with IFLR_PREFIX: 1486 * delete the first address that matches the specified prefix. 1487 * return values: 1488 * EINVAL on invalid parameters 1489 * EADDRNOTAVAIL on prefix match failed/specified address not found 1490 * other values may be returned from in6_ioctl() 1491 * 1492 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1493 * this is to accommodate address naming scheme other than RFC2374, 1494 * in the future. 1495 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1496 * address encoding scheme. (see figure on page 8) 1497 */ 1498 static int 1499 in6_lifaddr_ioctl(struct socket *so, u_long cmd, void *data, 1500 struct ifnet *ifp, struct lwp *l) 1501 { 1502 struct in6_ifaddr *ia; 1503 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1504 struct ifaddr *ifa; 1505 struct sockaddr *sa; 1506 1507 /* sanity checks */ 1508 if (!data || !ifp) { 1509 panic("invalid argument to in6_lifaddr_ioctl"); 1510 /* NOTREACHED */ 1511 } 1512 1513 switch (cmd) { 1514 case SIOCGLIFADDR: 1515 /* address must be specified on GET with IFLR_PREFIX */ 1516 if ((iflr->flags & IFLR_PREFIX) == 0) 1517 break; 1518 /* FALLTHROUGH */ 1519 case SIOCALIFADDR: 1520 case SIOCDLIFADDR: 1521 /* address must be specified on ADD and DELETE */ 1522 sa = (struct sockaddr *)&iflr->addr; 1523 if (sa->sa_family != AF_INET6) 1524 return EINVAL; 1525 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1526 return EINVAL; 1527 /* XXX need improvement */ 1528 sa = (struct sockaddr *)&iflr->dstaddr; 1529 if (sa->sa_family && sa->sa_family != AF_INET6) 1530 return EINVAL; 1531 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1532 return EINVAL; 1533 break; 1534 default: /* shouldn't happen */ 1535 #if 0 1536 panic("invalid cmd to in6_lifaddr_ioctl"); 1537 /* NOTREACHED */ 1538 #else 1539 return EOPNOTSUPP; 1540 #endif 1541 } 1542 if (sizeof(struct in6_addr) * NBBY < iflr->prefixlen) 1543 return EINVAL; 1544 1545 switch (cmd) { 1546 case SIOCALIFADDR: 1547 { 1548 struct in6_aliasreq ifra; 1549 struct in6_addr *xhostid = NULL; 1550 int prefixlen; 1551 1552 if ((iflr->flags & IFLR_PREFIX) != 0) { 1553 struct sockaddr_in6 *sin6; 1554 1555 /* 1556 * xhostid is to fill in the hostid part of the 1557 * address. xhostid points to the first link-local 1558 * address attached to the interface. 1559 */ 1560 ia = in6ifa_ifpforlinklocal(ifp, 0); 1561 if (ia == NULL) 1562 return EADDRNOTAVAIL; 1563 xhostid = IFA_IN6(&ia->ia_ifa); 1564 1565 /* prefixlen must be <= 64. */ 1566 if (64 < iflr->prefixlen) 1567 return EINVAL; 1568 prefixlen = iflr->prefixlen; 1569 1570 /* hostid part must be zero. */ 1571 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1572 if (sin6->sin6_addr.s6_addr32[2] != 0 1573 || sin6->sin6_addr.s6_addr32[3] != 0) { 1574 return EINVAL; 1575 } 1576 } else 1577 prefixlen = iflr->prefixlen; 1578 1579 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1580 memset(&ifra, 0, sizeof(ifra)); 1581 memcpy(ifra.ifra_name, iflr->iflr_name, sizeof(ifra.ifra_name)); 1582 1583 memcpy(&ifra.ifra_addr, &iflr->addr, 1584 ((struct sockaddr *)&iflr->addr)->sa_len); 1585 if (xhostid) { 1586 /* fill in hostid part */ 1587 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1588 xhostid->s6_addr32[2]; 1589 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1590 xhostid->s6_addr32[3]; 1591 } 1592 1593 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1594 memcpy(&ifra.ifra_dstaddr, &iflr->dstaddr, 1595 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1596 if (xhostid) { 1597 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1598 xhostid->s6_addr32[2]; 1599 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1600 xhostid->s6_addr32[3]; 1601 } 1602 } 1603 1604 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1605 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1606 1607 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 1608 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 1609 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1610 return in6_control(so, SIOCAIFADDR_IN6, (void *)&ifra, ifp, l); 1611 } 1612 case SIOCGLIFADDR: 1613 case SIOCDLIFADDR: 1614 { 1615 struct in6_addr mask, candidate, match; 1616 struct sockaddr_in6 *sin6; 1617 int cmp; 1618 1619 memset(&mask, 0, sizeof(mask)); 1620 if (iflr->flags & IFLR_PREFIX) { 1621 /* lookup a prefix rather than address. */ 1622 in6_prefixlen2mask(&mask, iflr->prefixlen); 1623 1624 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1625 memcpy(&match, &sin6->sin6_addr, sizeof(match)); 1626 match.s6_addr32[0] &= mask.s6_addr32[0]; 1627 match.s6_addr32[1] &= mask.s6_addr32[1]; 1628 match.s6_addr32[2] &= mask.s6_addr32[2]; 1629 match.s6_addr32[3] &= mask.s6_addr32[3]; 1630 1631 /* if you set extra bits, that's wrong */ 1632 if (memcmp(&match, &sin6->sin6_addr, sizeof(match))) 1633 return EINVAL; 1634 1635 cmp = 1; 1636 } else { 1637 if (cmd == SIOCGLIFADDR) { 1638 /* on getting an address, take the 1st match */ 1639 cmp = 0; /* XXX */ 1640 } else { 1641 /* on deleting an address, do exact match */ 1642 in6_prefixlen2mask(&mask, 128); 1643 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1644 memcpy(&match, &sin6->sin6_addr, sizeof(match)); 1645 1646 cmp = 1; 1647 } 1648 } 1649 1650 IFADDR_FOREACH(ifa, ifp) { 1651 if (ifa->ifa_addr->sa_family != AF_INET6) 1652 continue; 1653 if (!cmp) 1654 break; 1655 1656 /* 1657 * XXX: this is adhoc, but is necessary to allow 1658 * a user to specify fe80::/64 (not /10) for a 1659 * link-local address. 1660 */ 1661 memcpy(&candidate, IFA_IN6(ifa), sizeof(candidate)); 1662 in6_clearscope(&candidate); 1663 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1664 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1665 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1666 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1667 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1668 break; 1669 } 1670 if (!ifa) 1671 return EADDRNOTAVAIL; 1672 ia = ifa2ia6(ifa); 1673 1674 if (cmd == SIOCGLIFADDR) { 1675 int error; 1676 1677 /* fill in the if_laddrreq structure */ 1678 memcpy(&iflr->addr, &ia->ia_addr, ia->ia_addr.sin6_len); 1679 error = sa6_recoverscope( 1680 (struct sockaddr_in6 *)&iflr->addr); 1681 if (error != 0) 1682 return error; 1683 1684 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1685 memcpy(&iflr->dstaddr, &ia->ia_dstaddr, 1686 ia->ia_dstaddr.sin6_len); 1687 error = sa6_recoverscope( 1688 (struct sockaddr_in6 *)&iflr->dstaddr); 1689 if (error != 0) 1690 return error; 1691 } else 1692 memset(&iflr->dstaddr, 0, sizeof(iflr->dstaddr)); 1693 1694 iflr->prefixlen = 1695 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1696 1697 iflr->flags = ia->ia6_flags; /* XXX */ 1698 1699 return 0; 1700 } else { 1701 struct in6_aliasreq ifra; 1702 1703 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1704 memset(&ifra, 0, sizeof(ifra)); 1705 memcpy(ifra.ifra_name, iflr->iflr_name, 1706 sizeof(ifra.ifra_name)); 1707 1708 memcpy(&ifra.ifra_addr, &ia->ia_addr, 1709 ia->ia_addr.sin6_len); 1710 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1711 memcpy(&ifra.ifra_dstaddr, &ia->ia_dstaddr, 1712 ia->ia_dstaddr.sin6_len); 1713 } else { 1714 memset(&ifra.ifra_dstaddr, 0, 1715 sizeof(ifra.ifra_dstaddr)); 1716 } 1717 memcpy(&ifra.ifra_dstaddr, &ia->ia_prefixmask, 1718 ia->ia_prefixmask.sin6_len); 1719 1720 ifra.ifra_flags = ia->ia6_flags; 1721 return in6_control(so, SIOCDIFADDR_IN6, (void *)&ifra, 1722 ifp, l); 1723 } 1724 } 1725 } 1726 1727 return EOPNOTSUPP; /* just for safety */ 1728 } 1729 1730 /* 1731 * Initialize an interface's internet6 address 1732 * and routing table entry. 1733 */ 1734 static int 1735 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1736 const struct sockaddr_in6 *sin6, int newhost) 1737 { 1738 int error = 0, plen, ifacount = 0; 1739 int s = splnet(); 1740 struct ifaddr *ifa; 1741 1742 /* 1743 * Give the interface a chance to initialize 1744 * if this is its first address, 1745 * and to validate the address if necessary. 1746 */ 1747 IFADDR_FOREACH(ifa, ifp) { 1748 if (ifa->ifa_addr == NULL) 1749 continue; /* just for safety */ 1750 if (ifa->ifa_addr->sa_family != AF_INET6) 1751 continue; 1752 ifacount++; 1753 } 1754 1755 ia->ia_addr = *sin6; 1756 1757 if (ifacount <= 1 && 1758 (error = (*ifp->if_ioctl)(ifp, SIOCINITIFADDR, ia)) != 0) { 1759 splx(s); 1760 return error; 1761 } 1762 splx(s); 1763 1764 ia->ia_ifa.ifa_metric = ifp->if_metric; 1765 1766 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1767 1768 /* 1769 * Special case: 1770 * If the destination address is specified for a point-to-point 1771 * interface, install a route to the destination as an interface 1772 * direct route. 1773 */ 1774 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1775 if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) { 1776 if ((error = rtinit(&ia->ia_ifa, RTM_ADD, 1777 RTF_UP | RTF_HOST)) != 0) 1778 return error; 1779 ia->ia_flags |= IFA_ROUTE; 1780 } 1781 1782 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1783 if (newhost) { 1784 /* set the rtrequest function to create llinfo */ 1785 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1786 in6_ifaddloop(&ia->ia_ifa); 1787 } 1788 1789 if (ifp->if_flags & IFF_MULTICAST) 1790 in6_restoremkludge(ia, ifp); 1791 1792 return error; 1793 } 1794 1795 static struct ifaddr * 1796 bestifa(struct ifaddr *best_ifa, struct ifaddr *ifa) 1797 { 1798 if (best_ifa == NULL || best_ifa->ifa_preference < ifa->ifa_preference) 1799 return ifa; 1800 return best_ifa; 1801 } 1802 1803 /* 1804 * Find an IPv6 interface link-local address specific to an interface. 1805 */ 1806 struct in6_ifaddr * 1807 in6ifa_ifpforlinklocal(const struct ifnet *ifp, const int ignoreflags) 1808 { 1809 struct ifaddr *best_ifa = NULL, *ifa; 1810 1811 IFADDR_FOREACH(ifa, ifp) { 1812 if (ifa->ifa_addr == NULL) 1813 continue; /* just for safety */ 1814 if (ifa->ifa_addr->sa_family != AF_INET6) 1815 continue; 1816 if (!IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) 1817 continue; 1818 if ((((struct in6_ifaddr *)ifa)->ia6_flags & ignoreflags) != 0) 1819 continue; 1820 best_ifa = bestifa(best_ifa, ifa); 1821 } 1822 1823 return (struct in6_ifaddr *)best_ifa; 1824 } 1825 1826 1827 /* 1828 * find the internet address corresponding to a given interface and address. 1829 */ 1830 struct in6_ifaddr * 1831 in6ifa_ifpwithaddr(const struct ifnet *ifp, const struct in6_addr *addr) 1832 { 1833 struct ifaddr *best_ifa = NULL, *ifa; 1834 1835 IFADDR_FOREACH(ifa, ifp) { 1836 if (ifa->ifa_addr == NULL) 1837 continue; /* just for safety */ 1838 if (ifa->ifa_addr->sa_family != AF_INET6) 1839 continue; 1840 if (!IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1841 continue; 1842 best_ifa = bestifa(best_ifa, ifa); 1843 } 1844 1845 return (struct in6_ifaddr *)best_ifa; 1846 } 1847 1848 static struct in6_ifaddr * 1849 bestia(struct in6_ifaddr *best_ia, struct in6_ifaddr *ia) 1850 { 1851 if (best_ia == NULL || 1852 best_ia->ia_ifa.ifa_preference < ia->ia_ifa.ifa_preference) 1853 return ia; 1854 return best_ia; 1855 } 1856 1857 /* 1858 * find the internet address on a given interface corresponding to a neighbor's 1859 * address. 1860 */ 1861 struct in6_ifaddr * 1862 in6ifa_ifplocaladdr(const struct ifnet *ifp, const struct in6_addr *addr) 1863 { 1864 struct ifaddr *ifa; 1865 struct in6_ifaddr *best_ia = NULL, *ia; 1866 1867 IFADDR_FOREACH(ifa, ifp) { 1868 if (ifa->ifa_addr == NULL) 1869 continue; /* just for safety */ 1870 if (ifa->ifa_addr->sa_family != AF_INET6) 1871 continue; 1872 ia = (struct in6_ifaddr *)ifa; 1873 if (!IN6_ARE_MASKED_ADDR_EQUAL(addr, 1874 &ia->ia_addr.sin6_addr, 1875 &ia->ia_prefixmask.sin6_addr)) 1876 continue; 1877 best_ia = bestia(best_ia, ia); 1878 } 1879 1880 return best_ia; 1881 } 1882 1883 /* 1884 * Convert IP6 address to printable (loggable) representation. 1885 */ 1886 static int ip6round = 0; 1887 char * 1888 ip6_sprintf(const struct in6_addr *addr) 1889 { 1890 static char ip6buf[8][48]; 1891 int i; 1892 char *bp; 1893 char *cp; 1894 const u_int16_t *a = (const u_int16_t *)addr; 1895 const u_int8_t *d; 1896 int dcolon = 0; 1897 1898 ip6round = (ip6round + 1) & 7; 1899 cp = ip6buf[ip6round]; 1900 1901 for (i = 0; i < 8; i++) { 1902 if (dcolon == 1) { 1903 if (*a == 0) { 1904 if (i == 7) 1905 *cp++ = ':'; 1906 a++; 1907 continue; 1908 } else 1909 dcolon = 2; 1910 } 1911 if (*a == 0) { 1912 if (dcolon == 0 && *(a + 1) == 0) { 1913 if (i == 0) 1914 *cp++ = ':'; 1915 *cp++ = ':'; 1916 dcolon = 1; 1917 } else { 1918 *cp++ = '0'; 1919 *cp++ = ':'; 1920 } 1921 a++; 1922 continue; 1923 } 1924 d = (const u_char *)a; 1925 bp = cp; 1926 *cp = hexdigits[*d >> 4]; 1927 if (*cp != '0') 1928 cp++; 1929 *cp = hexdigits[*d++ & 0xf]; 1930 if (cp != bp || *cp != '0') 1931 cp++; 1932 *cp = hexdigits[*d >> 4]; 1933 if (cp != bp || *cp != '0') 1934 cp++; 1935 *cp++ = hexdigits[*d & 0xf]; 1936 *cp++ = ':'; 1937 a++; 1938 } 1939 *--cp = 0; 1940 return ip6buf[ip6round]; 1941 } 1942 1943 /* 1944 * Determine if an address is on a local network. 1945 */ 1946 int 1947 in6_localaddr(const struct in6_addr *in6) 1948 { 1949 struct in6_ifaddr *ia; 1950 1951 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1952 return 1; 1953 1954 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 1955 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1956 &ia->ia_prefixmask.sin6_addr)) 1957 return 1; 1958 1959 return 0; 1960 } 1961 1962 int 1963 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1964 { 1965 struct in6_ifaddr *ia; 1966 1967 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1968 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1969 &sa6->sin6_addr) && 1970 #ifdef SCOPEDROUTING 1971 ia->ia_addr.sin6_scope_id == sa6->sin6_scope_id && 1972 #endif 1973 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) 1974 return 1; /* true */ 1975 1976 /* XXX: do we still have to go thru the rest of the list? */ 1977 } 1978 1979 return 0; /* false */ 1980 } 1981 1982 /* 1983 * return length of part which dst and src are equal 1984 * hard coding... 1985 */ 1986 int 1987 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1988 { 1989 int match = 0; 1990 u_char *s = (u_char *)src, *d = (u_char *)dst; 1991 u_char *lim = s + 16, r; 1992 1993 while (s < lim) 1994 if ((r = (*d++ ^ *s++)) != 0) { 1995 while (r < 128) { 1996 match++; 1997 r <<= 1; 1998 } 1999 break; 2000 } else 2001 match += NBBY; 2002 return match; 2003 } 2004 2005 /* XXX: to be scope conscious */ 2006 int 2007 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 2008 { 2009 int bytelen, bitlen; 2010 2011 /* sanity check */ 2012 if (len < 0 || len > 128) { 2013 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 2014 len); 2015 return 0; 2016 } 2017 2018 bytelen = len / NBBY; 2019 bitlen = len % NBBY; 2020 2021 if (memcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 2022 return 0; 2023 if (bitlen != 0 && 2024 p1->s6_addr[bytelen] >> (NBBY - bitlen) != 2025 p2->s6_addr[bytelen] >> (NBBY - bitlen)) 2026 return 0; 2027 2028 return 1; 2029 } 2030 2031 void 2032 in6_prefixlen2mask(struct in6_addr *maskp, int len) 2033 { 2034 static const u_char maskarray[NBBY] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 2035 int bytelen, bitlen, i; 2036 2037 /* sanity check */ 2038 if (len < 0 || len > 128) { 2039 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 2040 len); 2041 return; 2042 } 2043 2044 memset(maskp, 0, sizeof(*maskp)); 2045 bytelen = len / NBBY; 2046 bitlen = len % NBBY; 2047 for (i = 0; i < bytelen; i++) 2048 maskp->s6_addr[i] = 0xff; 2049 if (bitlen) 2050 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 2051 } 2052 2053 /* 2054 * return the best address out of the same scope. if no address was 2055 * found, return the first valid address from designated IF. 2056 */ 2057 struct in6_ifaddr * 2058 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2059 { 2060 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2061 struct ifaddr *ifa; 2062 struct in6_ifaddr *best_ia = NULL, *ia; 2063 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2064 2065 dep[0] = dep[1] = NULL; 2066 2067 /* 2068 * We first look for addresses in the same scope. 2069 * If there is one, return it. 2070 * If two or more, return one which matches the dst longest. 2071 * If none, return one of global addresses assigned other ifs. 2072 */ 2073 IFADDR_FOREACH(ifa, ifp) { 2074 if (ifa->ifa_addr->sa_family != AF_INET6) 2075 continue; 2076 ia = (struct in6_ifaddr *)ifa; 2077 if (ia->ia6_flags & IN6_IFF_ANYCAST) 2078 continue; /* XXX: is there any case to allow anycast? */ 2079 if (ia->ia6_flags & IN6_IFF_NOTREADY) 2080 continue; /* don't use this interface */ 2081 if (ia->ia6_flags & IN6_IFF_DETACHED) 2082 continue; 2083 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2084 if (ip6_use_deprecated) 2085 dep[0] = ia; 2086 continue; 2087 } 2088 2089 if (dst_scope != in6_addrscope(IFA_IN6(ifa))) 2090 continue; 2091 /* 2092 * call in6_matchlen() as few as possible 2093 */ 2094 if (best_ia == NULL) { 2095 best_ia = ia; 2096 continue; 2097 } 2098 if (blen == -1) 2099 blen = in6_matchlen(&best_ia->ia_addr.sin6_addr, dst); 2100 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2101 if (tlen > blen) { 2102 blen = tlen; 2103 best_ia = ia; 2104 } else if (tlen == blen) 2105 best_ia = bestia(best_ia, ia); 2106 } 2107 if (best_ia != NULL) 2108 return best_ia; 2109 2110 IFADDR_FOREACH(ifa, ifp) { 2111 if (ifa->ifa_addr->sa_family != AF_INET6) 2112 continue; 2113 ia = (struct in6_ifaddr *)ifa; 2114 if (ia->ia6_flags & IN6_IFF_ANYCAST) 2115 continue; /* XXX: is there any case to allow anycast? */ 2116 if (ia->ia6_flags & IN6_IFF_NOTREADY) 2117 continue; /* don't use this interface */ 2118 if (ia->ia6_flags & IN6_IFF_DETACHED) 2119 continue; 2120 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2121 if (ip6_use_deprecated) 2122 dep[1] = (struct in6_ifaddr *)ifa; 2123 continue; 2124 } 2125 2126 best_ia = bestia(best_ia, ia); 2127 } 2128 if (best_ia != NULL) 2129 return best_ia; 2130 2131 /* use the last-resort values, that are, deprecated addresses */ 2132 if (dep[0]) 2133 return dep[0]; 2134 if (dep[1]) 2135 return dep[1]; 2136 2137 return NULL; 2138 } 2139 2140 /* 2141 * perform DAD when interface becomes IFF_UP. 2142 */ 2143 void 2144 in6_if_up(struct ifnet *ifp) 2145 { 2146 struct ifaddr *ifa; 2147 struct in6_ifaddr *ia; 2148 2149 IFADDR_FOREACH(ifa, ifp) { 2150 if (ifa->ifa_addr->sa_family != AF_INET6) 2151 continue; 2152 ia = (struct in6_ifaddr *)ifa; 2153 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2154 /* 2155 * The TENTATIVE flag was likely set by hand 2156 * beforehand, implicitly indicating the need for DAD. 2157 * We may be able to skip the random delay in this 2158 * case, but we impose delays just in case. 2159 */ 2160 nd6_dad_start(ifa, 2161 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 2162 } 2163 } 2164 2165 /* 2166 * special cases, like 6to4, are handled in in6_ifattach 2167 */ 2168 in6_ifattach(ifp, NULL); 2169 } 2170 2171 int 2172 in6if_do_dad(struct ifnet *ifp) 2173 { 2174 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 2175 return 0; 2176 2177 switch (ifp->if_type) { 2178 case IFT_FAITH: 2179 /* 2180 * These interfaces do not have the IFF_LOOPBACK flag, 2181 * but loop packets back. We do not have to do DAD on such 2182 * interfaces. We should even omit it, because loop-backed 2183 * NS would confuse the DAD procedure. 2184 */ 2185 return 0; 2186 default: 2187 /* 2188 * Our DAD routine requires the interface up and running. 2189 * However, some interfaces can be up before the RUNNING 2190 * status. Additionaly, users may try to assign addresses 2191 * before the interface becomes up (or running). 2192 * We simply skip DAD in such a case as a work around. 2193 * XXX: we should rather mark "tentative" on such addresses, 2194 * and do DAD after the interface becomes ready. 2195 */ 2196 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != 2197 (IFF_UP|IFF_RUNNING)) 2198 return 0; 2199 2200 return 1; 2201 } 2202 } 2203 2204 /* 2205 * Calculate max IPv6 MTU through all the interfaces and store it 2206 * to in6_maxmtu. 2207 */ 2208 void 2209 in6_setmaxmtu(void) 2210 { 2211 unsigned long maxmtu = 0; 2212 struct ifnet *ifp; 2213 2214 TAILQ_FOREACH(ifp, &ifnet, if_list) { 2215 /* this function can be called during ifnet initialization */ 2216 if (!ifp->if_afdata[AF_INET6]) 2217 continue; 2218 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2219 IN6_LINKMTU(ifp) > maxmtu) 2220 maxmtu = IN6_LINKMTU(ifp); 2221 } 2222 if (maxmtu) /* update only when maxmtu is positive */ 2223 in6_maxmtu = maxmtu; 2224 } 2225 2226 /* 2227 * Provide the length of interface identifiers to be used for the link attached 2228 * to the given interface. The length should be defined in "IPv6 over 2229 * xxx-link" document. Note that address architecture might also define 2230 * the length for a particular set of address prefixes, regardless of the 2231 * link type. As clarified in rfc2462bis, those two definitions should be 2232 * consistent, and those really are as of August 2004. 2233 */ 2234 int 2235 in6_if2idlen(struct ifnet *ifp) 2236 { 2237 switch (ifp->if_type) { 2238 case IFT_ETHER: /* RFC2464 */ 2239 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2240 case IFT_L2VLAN: /* ditto */ 2241 case IFT_IEEE80211: /* ditto */ 2242 case IFT_FDDI: /* RFC2467 */ 2243 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 2244 case IFT_PPP: /* RFC2472 */ 2245 case IFT_ARCNET: /* RFC2497 */ 2246 case IFT_FRELAY: /* RFC2590 */ 2247 case IFT_IEEE1394: /* RFC3146 */ 2248 case IFT_GIF: /* draft-ietf-v6ops-mech-v2-07 */ 2249 case IFT_LOOP: /* XXX: is this really correct? */ 2250 return 64; 2251 default: 2252 /* 2253 * Unknown link type: 2254 * It might be controversial to use the today's common constant 2255 * of 64 for these cases unconditionally. For full compliance, 2256 * we should return an error in this case. On the other hand, 2257 * if we simply miss the standard for the link type or a new 2258 * standard is defined for a new link type, the IFID length 2259 * is very likely to be the common constant. As a compromise, 2260 * we always use the constant, but make an explicit notice 2261 * indicating the "unknown" case. 2262 */ 2263 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2264 return 64; 2265 } 2266 } 2267 2268 void * 2269 in6_domifattach(struct ifnet *ifp) 2270 { 2271 struct in6_ifextra *ext; 2272 2273 ext = malloc(sizeof(*ext), M_IFADDR, M_WAITOK|M_ZERO); 2274 2275 ext->in6_ifstat = malloc(sizeof(struct in6_ifstat), 2276 M_IFADDR, M_WAITOK|M_ZERO); 2277 2278 ext->icmp6_ifstat = malloc(sizeof(struct icmp6_ifstat), 2279 M_IFADDR, M_WAITOK|M_ZERO); 2280 2281 ext->nd_ifinfo = nd6_ifattach(ifp); 2282 ext->scope6_id = scope6_ifattach(ifp); 2283 return ext; 2284 } 2285 2286 void 2287 in6_domifdetach(struct ifnet *ifp, void *aux) 2288 { 2289 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2290 2291 nd6_ifdetach(ext->nd_ifinfo); 2292 free(ext->in6_ifstat, M_IFADDR); 2293 free(ext->icmp6_ifstat, M_IFADDR); 2294 scope6_ifdetach(ext->scope6_id); 2295 free(ext, M_IFADDR); 2296 } 2297 2298 /* 2299 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2300 * v4 mapped addr or v4 compat addr 2301 */ 2302 void 2303 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2304 { 2305 memset(sin, 0, sizeof(*sin)); 2306 sin->sin_len = sizeof(struct sockaddr_in); 2307 sin->sin_family = AF_INET; 2308 sin->sin_port = sin6->sin6_port; 2309 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2310 } 2311 2312 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2313 void 2314 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2315 { 2316 memset(sin6, 0, sizeof(*sin6)); 2317 sin6->sin6_len = sizeof(struct sockaddr_in6); 2318 sin6->sin6_family = AF_INET6; 2319 sin6->sin6_port = sin->sin_port; 2320 sin6->sin6_addr.s6_addr32[0] = 0; 2321 sin6->sin6_addr.s6_addr32[1] = 0; 2322 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2323 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2324 } 2325 2326 /* Convert sockaddr_in6 into sockaddr_in. */ 2327 void 2328 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2329 { 2330 struct sockaddr_in *sin_p; 2331 struct sockaddr_in6 sin6; 2332 2333 /* 2334 * Save original sockaddr_in6 addr and convert it 2335 * to sockaddr_in. 2336 */ 2337 sin6 = *(struct sockaddr_in6 *)nam; 2338 sin_p = (struct sockaddr_in *)nam; 2339 in6_sin6_2_sin(sin_p, &sin6); 2340 } 2341 2342 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2343 void 2344 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2345 { 2346 struct sockaddr_in *sin_p; 2347 struct sockaddr_in6 *sin6_p; 2348 2349 sin6_p = malloc(sizeof(*sin6_p), M_SONAME, M_WAITOK); 2350 sin_p = (struct sockaddr_in *)*nam; 2351 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2352 free(*nam, M_SONAME); 2353 *nam = (struct sockaddr *)sin6_p; 2354 } 2355