in6.c revision 197138
1/*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $ 30 */ 31 32/*- 33 * Copyright (c) 1982, 1986, 1991, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 4. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)in.c 8.2 (Berkeley) 11/15/93 61 */ 62 63#include <sys/cdefs.h> 64__FBSDID("$FreeBSD: head/sys/netinet6/in6.c 197138 2009-09-12 22:08:20Z hrs $"); 65 66#include "opt_inet.h" 67#include "opt_inet6.h" 68 69#include <sys/param.h> 70#include <sys/errno.h> 71#include <sys/jail.h> 72#include <sys/malloc.h> 73#include <sys/socket.h> 74#include <sys/socketvar.h> 75#include <sys/sockio.h> 76#include <sys/systm.h> 77#include <sys/priv.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#include <net/vnet.h> 88 89#include <netinet/in.h> 90#include <netinet/in_var.h> 91#include <net/if_llatbl.h> 92#include <netinet/if_ether.h> 93#include <netinet/in_systm.h> 94#include <netinet/ip.h> 95#include <netinet/in_pcb.h> 96 97#include <netinet/ip6.h> 98#include <netinet6/ip6_var.h> 99#include <netinet6/nd6.h> 100#include <netinet6/mld6_var.h> 101#include <netinet6/ip6_mroute.h> 102#include <netinet6/in6_ifattach.h> 103#include <netinet6/scope6_var.h> 104#include <netinet6/in6_pcb.h> 105 106/* 107 * Definitions of some costant IP6 addresses. 108 */ 109const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 110const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 111const struct in6_addr in6addr_nodelocal_allnodes = 112 IN6ADDR_NODELOCAL_ALLNODES_INIT; 113const struct in6_addr in6addr_linklocal_allnodes = 114 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 115const struct in6_addr in6addr_linklocal_allrouters = 116 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 117const struct in6_addr in6addr_linklocal_allv2routers = 118 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_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 = 127 { sizeof(sa6_any), AF_INET6, 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(struct in6_ifaddr *, struct ifnet *); 134 135int (*faithprefix_p)(struct in6_addr *); 136 137 138 139int 140in6_mask2len(struct in6_addr *mask, u_char *lim0) 141{ 142 int x = 0, y; 143 u_char *lim = lim0, *p; 144 145 /* ignore the scope_id part */ 146 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 147 lim = (u_char *)mask + sizeof(*mask); 148 for (p = (u_char *)mask; p < lim; x++, p++) { 149 if (*p != 0xff) 150 break; 151 } 152 y = 0; 153 if (p < lim) { 154 for (y = 0; y < 8; y++) { 155 if ((*p & (0x80 >> y)) == 0) 156 break; 157 } 158 } 159 160 /* 161 * when the limit pointer is given, do a stricter check on the 162 * remaining bits. 163 */ 164 if (p < lim) { 165 if (y != 0 && (*p & (0x00ff >> y)) != 0) 166 return (-1); 167 for (p = p + 1; p < lim; p++) 168 if (*p != 0) 169 return (-1); 170 } 171 172 return x * 8 + y; 173} 174 175#define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 176#define ia62ifa(ia6) (&((ia6)->ia_ifa)) 177 178int 179in6_control(struct socket *so, u_long cmd, caddr_t data, 180 struct ifnet *ifp, struct thread *td) 181{ 182 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 183 struct in6_ifaddr *ia = NULL; 184 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 185 struct sockaddr_in6 *sa6; 186 int error; 187 188 switch (cmd) { 189 case SIOCGETSGCNT_IN6: 190 case SIOCGETMIFCNT_IN6: 191 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP); 192 } 193 194 switch(cmd) { 195 case SIOCAADDRCTL_POLICY: 196 case SIOCDADDRCTL_POLICY: 197 if (td != NULL) { 198 error = priv_check(td, PRIV_NETINET_ADDRCTRL6); 199 if (error) 200 return (error); 201 } 202 return (in6_src_ioctl(cmd, data)); 203 } 204 205 if (ifp == NULL) 206 return (EOPNOTSUPP); 207 208 switch (cmd) { 209 case SIOCSNDFLUSH_IN6: 210 case SIOCSPFXFLUSH_IN6: 211 case SIOCSRTRFLUSH_IN6: 212 case SIOCSDEFIFACE_IN6: 213 case SIOCSIFINFO_FLAGS: 214 case SIOCSIFINFO_IN6: 215 if (td != NULL) { 216 error = priv_check(td, PRIV_NETINET_ND6); 217 if (error) 218 return (error); 219 } 220 /* FALLTHROUGH */ 221 case OSIOCGIFINFO_IN6: 222 case SIOCGIFINFO_IN6: 223 case SIOCGDRLST_IN6: 224 case SIOCGPRLST_IN6: 225 case SIOCGNBRINFO_IN6: 226 case SIOCGDEFIFACE_IN6: 227 return (nd6_ioctl(cmd, data, ifp)); 228 } 229 230 switch (cmd) { 231 case SIOCSIFPREFIX_IN6: 232 case SIOCDIFPREFIX_IN6: 233 case SIOCAIFPREFIX_IN6: 234 case SIOCCIFPREFIX_IN6: 235 case SIOCSGIFPREFIX_IN6: 236 case SIOCGIFPREFIX_IN6: 237 log(LOG_NOTICE, 238 "prefix ioctls are now invalidated. " 239 "please use ifconfig.\n"); 240 return (EOPNOTSUPP); 241 } 242 243 switch (cmd) { 244 case SIOCSSCOPE6: 245 if (td != NULL) { 246 error = priv_check(td, PRIV_NETINET_SCOPE6); 247 if (error) 248 return (error); 249 } 250 return (scope6_set(ifp, 251 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 252 case SIOCGSCOPE6: 253 return (scope6_get(ifp, 254 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 255 case SIOCGSCOPE6DEF: 256 return (scope6_get_default((struct scope6_id *) 257 ifr->ifr_ifru.ifru_scope_id)); 258 } 259 260 switch (cmd) { 261 case SIOCALIFADDR: 262 if (td != NULL) { 263 error = priv_check(td, PRIV_NET_ADDIFADDR); 264 if (error) 265 return (error); 266 } 267 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 268 269 case SIOCDLIFADDR: 270 if (td != NULL) { 271 error = priv_check(td, PRIV_NET_DELIFADDR); 272 if (error) 273 return (error); 274 } 275 /* FALLTHROUGH */ 276 case SIOCGLIFADDR: 277 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 278 } 279 280 /* 281 * Find address for this interface, if it exists. 282 * 283 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 284 * only, and used the first interface address as the target of other 285 * operations (without checking ifra_addr). This was because netinet 286 * code/API assumed at most 1 interface address per interface. 287 * Since IPv6 allows a node to assign multiple addresses 288 * on a single interface, we almost always look and check the 289 * presence of ifra_addr, and reject invalid ones here. 290 * It also decreases duplicated code among SIOC*_IN6 operations. 291 */ 292 switch (cmd) { 293 case SIOCAIFADDR_IN6: 294 case SIOCSIFPHYADDR_IN6: 295 sa6 = &ifra->ifra_addr; 296 break; 297 case SIOCSIFADDR_IN6: 298 case SIOCGIFADDR_IN6: 299 case SIOCSIFDSTADDR_IN6: 300 case SIOCSIFNETMASK_IN6: 301 case SIOCGIFDSTADDR_IN6: 302 case SIOCGIFNETMASK_IN6: 303 case SIOCDIFADDR_IN6: 304 case SIOCGIFPSRCADDR_IN6: 305 case SIOCGIFPDSTADDR_IN6: 306 case SIOCGIFAFLAG_IN6: 307 case SIOCSNDFLUSH_IN6: 308 case SIOCSPFXFLUSH_IN6: 309 case SIOCSRTRFLUSH_IN6: 310 case SIOCGIFALIFETIME_IN6: 311 case SIOCSIFALIFETIME_IN6: 312 case SIOCGIFSTAT_IN6: 313 case SIOCGIFSTAT_ICMP6: 314 sa6 = &ifr->ifr_addr; 315 break; 316 default: 317 sa6 = NULL; 318 break; 319 } 320 if (sa6 && sa6->sin6_family == AF_INET6) { 321 if (sa6->sin6_scope_id != 0) 322 error = sa6_embedscope(sa6, 0); 323 else 324 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 325 if (error != 0) 326 return (error); 327 if (td != NULL && (error = prison_check_ip6(td->td_ucred, 328 &sa6->sin6_addr)) != 0) 329 return (error); 330 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 331 } else 332 ia = NULL; 333 334 switch (cmd) { 335 case SIOCSIFADDR_IN6: 336 case SIOCSIFDSTADDR_IN6: 337 case SIOCSIFNETMASK_IN6: 338 /* 339 * Since IPv6 allows a node to assign multiple addresses 340 * on a single interface, SIOCSIFxxx ioctls are deprecated. 341 */ 342 /* we decided to obsolete this command (20000704) */ 343 error = EINVAL; 344 goto out; 345 346 case SIOCDIFADDR_IN6: 347 /* 348 * for IPv4, we look for existing in_ifaddr here to allow 349 * "ifconfig if0 delete" to remove the first IPv4 address on 350 * the interface. For IPv6, as the spec allows multiple 351 * interface address from the day one, we consider "remove the 352 * first one" semantics to be not preferable. 353 */ 354 if (ia == NULL) { 355 error = EADDRNOTAVAIL; 356 goto out; 357 } 358 /* FALLTHROUGH */ 359 case SIOCAIFADDR_IN6: 360 /* 361 * We always require users to specify a valid IPv6 address for 362 * the corresponding operation. 363 */ 364 if (ifra->ifra_addr.sin6_family != AF_INET6 || 365 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 366 error = EAFNOSUPPORT; 367 goto out; 368 } 369 370 if (td != NULL) { 371 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 372 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR); 373 if (error) 374 goto out; 375 } 376 break; 377 378 case SIOCGIFADDR_IN6: 379 /* This interface is basically deprecated. use SIOCGIFCONF. */ 380 /* FALLTHROUGH */ 381 case SIOCGIFAFLAG_IN6: 382 case SIOCGIFNETMASK_IN6: 383 case SIOCGIFDSTADDR_IN6: 384 case SIOCGIFALIFETIME_IN6: 385 /* must think again about its semantics */ 386 if (ia == NULL) { 387 error = EADDRNOTAVAIL; 388 goto out; 389 } 390 break; 391 392 case SIOCSIFALIFETIME_IN6: 393 { 394 struct in6_addrlifetime *lt; 395 396 if (td != NULL) { 397 error = priv_check(td, PRIV_NETINET_ALIFETIME6); 398 if (error) 399 goto out; 400 } 401 if (ia == NULL) { 402 error = EADDRNOTAVAIL; 403 goto out; 404 } 405 /* sanity for overflow - beware unsigned */ 406 lt = &ifr->ifr_ifru.ifru_lifetime; 407 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME && 408 lt->ia6t_vltime + time_second < time_second) { 409 error = EINVAL; 410 goto out; 411 } 412 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME && 413 lt->ia6t_pltime + time_second < time_second) { 414 error = EINVAL; 415 goto out; 416 } 417 break; 418 } 419 } 420 421 switch (cmd) { 422 case SIOCGIFADDR_IN6: 423 ifr->ifr_addr = ia->ia_addr; 424 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 425 goto out; 426 break; 427 428 case SIOCGIFDSTADDR_IN6: 429 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 430 error = EINVAL; 431 goto out; 432 } 433 /* 434 * XXX: should we check if ifa_dstaddr is NULL and return 435 * an error? 436 */ 437 ifr->ifr_dstaddr = ia->ia_dstaddr; 438 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 439 goto out; 440 break; 441 442 case SIOCGIFNETMASK_IN6: 443 ifr->ifr_addr = ia->ia_prefixmask; 444 break; 445 446 case SIOCGIFAFLAG_IN6: 447 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 448 break; 449 450 case SIOCGIFSTAT_IN6: 451 if (ifp == NULL) { 452 error = EINVAL; 453 goto out; 454 } 455 bzero(&ifr->ifr_ifru.ifru_stat, 456 sizeof(ifr->ifr_ifru.ifru_stat)); 457 ifr->ifr_ifru.ifru_stat = 458 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat; 459 break; 460 461 case SIOCGIFSTAT_ICMP6: 462 if (ifp == NULL) { 463 error = EINVAL; 464 goto out; 465 } 466 bzero(&ifr->ifr_ifru.ifru_icmp6stat, 467 sizeof(ifr->ifr_ifru.ifru_icmp6stat)); 468 ifr->ifr_ifru.ifru_icmp6stat = 469 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat; 470 break; 471 472 case SIOCGIFALIFETIME_IN6: 473 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 474 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 475 time_t maxexpire; 476 struct in6_addrlifetime *retlt = 477 &ifr->ifr_ifru.ifru_lifetime; 478 479 /* 480 * XXX: adjust expiration time assuming time_t is 481 * signed. 482 */ 483 maxexpire = (-1) & 484 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 485 if (ia->ia6_lifetime.ia6t_vltime < 486 maxexpire - ia->ia6_updatetime) { 487 retlt->ia6t_expire = ia->ia6_updatetime + 488 ia->ia6_lifetime.ia6t_vltime; 489 } else 490 retlt->ia6t_expire = maxexpire; 491 } 492 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 493 time_t maxexpire; 494 struct in6_addrlifetime *retlt = 495 &ifr->ifr_ifru.ifru_lifetime; 496 497 /* 498 * XXX: adjust expiration time assuming time_t is 499 * signed. 500 */ 501 maxexpire = (-1) & 502 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 503 if (ia->ia6_lifetime.ia6t_pltime < 504 maxexpire - ia->ia6_updatetime) { 505 retlt->ia6t_preferred = ia->ia6_updatetime + 506 ia->ia6_lifetime.ia6t_pltime; 507 } else 508 retlt->ia6t_preferred = maxexpire; 509 } 510 break; 511 512 case SIOCSIFALIFETIME_IN6: 513 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; 514 /* for sanity */ 515 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 516 ia->ia6_lifetime.ia6t_expire = 517 time_second + ia->ia6_lifetime.ia6t_vltime; 518 } else 519 ia->ia6_lifetime.ia6t_expire = 0; 520 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 521 ia->ia6_lifetime.ia6t_preferred = 522 time_second + ia->ia6_lifetime.ia6t_pltime; 523 } else 524 ia->ia6_lifetime.ia6t_preferred = 0; 525 break; 526 527 case SIOCAIFADDR_IN6: 528 { 529 int i; 530 struct nd_prefixctl pr0; 531 struct nd_prefix *pr; 532 533 /* 534 * first, make or update the interface address structure, 535 * and link it to the list. 536 */ 537 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 538 goto out; 539 if (ia != NULL) 540 ifa_free(&ia->ia_ifa); 541 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 542 == NULL) { 543 /* 544 * this can happen when the user specify the 0 valid 545 * lifetime. 546 */ 547 break; 548 } 549 550 /* 551 * then, make the prefix on-link on the interface. 552 * XXX: we'd rather create the prefix before the address, but 553 * we need at least one address to install the corresponding 554 * interface route, so we configure the address first. 555 */ 556 557 /* 558 * convert mask to prefix length (prefixmask has already 559 * been validated in in6_update_ifa(). 560 */ 561 bzero(&pr0, sizeof(pr0)); 562 pr0.ndpr_ifp = ifp; 563 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 564 NULL); 565 if (pr0.ndpr_plen == 128) { 566 break; /* we don't need to install a host route. */ 567 } 568 pr0.ndpr_prefix = ifra->ifra_addr; 569 /* apply the mask for safety. */ 570 for (i = 0; i < 4; i++) { 571 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 572 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i]; 573 } 574 /* 575 * XXX: since we don't have an API to set prefix (not address) 576 * lifetimes, we just use the same lifetimes as addresses. 577 * The (temporarily) installed lifetimes can be overridden by 578 * later advertised RAs (when accept_rtadv is non 0), which is 579 * an intended behavior. 580 */ 581 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 582 pr0.ndpr_raf_auto = 583 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 584 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 585 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 586 587 /* add the prefix if not yet. */ 588 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 589 /* 590 * nd6_prelist_add will install the corresponding 591 * interface route. 592 */ 593 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) 594 goto out; 595 if (pr == NULL) { 596 log(LOG_ERR, "nd6_prelist_add succeeded but " 597 "no prefix\n"); 598 error = EINVAL; 599 goto out; 600 } 601 } 602 603 /* relate the address to the prefix */ 604 if (ia->ia6_ndpr == NULL) { 605 ia->ia6_ndpr = pr; 606 pr->ndpr_refcnt++; 607 608 /* 609 * If this is the first autoconf address from the 610 * prefix, create a temporary address as well 611 * (when required). 612 */ 613 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 614 V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) { 615 int e; 616 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 617 log(LOG_NOTICE, "in6_control: failed " 618 "to create a temporary address, " 619 "errno=%d\n", e); 620 } 621 } 622 } 623 624 /* 625 * this might affect the status of autoconfigured addresses, 626 * that is, this address might make other addresses detached. 627 */ 628 pfxlist_onlink_check(); 629 if (error == 0 && ia) 630 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 631 break; 632 } 633 634 case SIOCDIFADDR_IN6: 635 { 636 struct nd_prefix *pr; 637 638 /* 639 * If the address being deleted is the only one that owns 640 * the corresponding prefix, expire the prefix as well. 641 * XXX: theoretically, we don't have to worry about such 642 * relationship, since we separate the address management 643 * and the prefix management. We do this, however, to provide 644 * as much backward compatibility as possible in terms of 645 * the ioctl operation. 646 * Note that in6_purgeaddr() will decrement ndpr_refcnt. 647 */ 648 pr = ia->ia6_ndpr; 649 in6_purgeaddr(&ia->ia_ifa); 650 if (pr && pr->ndpr_refcnt == 0) 651 prelist_remove(pr); 652 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 653 break; 654 } 655 656 default: 657 if (ifp == NULL || ifp->if_ioctl == 0) { 658 error = EOPNOTSUPP; 659 goto out; 660 } 661 error = (*ifp->if_ioctl)(ifp, cmd, data); 662 goto out; 663 } 664 665 error = 0; 666out: 667 if (ia != NULL) 668 ifa_free(&ia->ia_ifa); 669 return (error); 670} 671 672/* 673 * Update parameters of an IPv6 interface address. 674 * If necessary, a new entry is created and linked into address chains. 675 * This function is separated from in6_control(). 676 * XXX: should this be performed under splnet()? 677 */ 678int 679in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 680 struct in6_ifaddr *ia, int flags) 681{ 682 int error = 0, hostIsNew = 0, plen = -1; 683 struct sockaddr_in6 dst6; 684 struct in6_addrlifetime *lt; 685 struct in6_multi_mship *imm; 686 struct in6_multi *in6m_sol; 687 struct rtentry *rt; 688 int delay; 689 char ip6buf[INET6_ADDRSTRLEN]; 690 691 /* Validate parameters */ 692 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 693 return (EINVAL); 694 695 /* 696 * The destination address for a p2p link must have a family 697 * of AF_UNSPEC or AF_INET6. 698 */ 699 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 700 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 701 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 702 return (EAFNOSUPPORT); 703 /* 704 * validate ifra_prefixmask. don't check sin6_family, netmask 705 * does not carry fields other than sin6_len. 706 */ 707 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 708 return (EINVAL); 709 /* 710 * Because the IPv6 address architecture is classless, we require 711 * users to specify a (non 0) prefix length (mask) for a new address. 712 * We also require the prefix (when specified) mask is valid, and thus 713 * reject a non-consecutive mask. 714 */ 715 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 716 return (EINVAL); 717 if (ifra->ifra_prefixmask.sin6_len != 0) { 718 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 719 (u_char *)&ifra->ifra_prefixmask + 720 ifra->ifra_prefixmask.sin6_len); 721 if (plen <= 0) 722 return (EINVAL); 723 } else { 724 /* 725 * In this case, ia must not be NULL. We just use its prefix 726 * length. 727 */ 728 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 729 } 730 /* 731 * If the destination address on a p2p interface is specified, 732 * and the address is a scoped one, validate/set the scope 733 * zone identifier. 734 */ 735 dst6 = ifra->ifra_dstaddr; 736 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 737 (dst6.sin6_family == AF_INET6)) { 738 struct in6_addr in6_tmp; 739 u_int32_t zoneid; 740 741 in6_tmp = dst6.sin6_addr; 742 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 743 return (EINVAL); /* XXX: should be impossible */ 744 745 if (dst6.sin6_scope_id != 0) { 746 if (dst6.sin6_scope_id != zoneid) 747 return (EINVAL); 748 } else /* user omit to specify the ID. */ 749 dst6.sin6_scope_id = zoneid; 750 751 /* convert into the internal form */ 752 if (sa6_embedscope(&dst6, 0)) 753 return (EINVAL); /* XXX: should be impossible */ 754 } 755 /* 756 * The destination address can be specified only for a p2p or a 757 * loopback interface. If specified, the corresponding prefix length 758 * must be 128. 759 */ 760 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 761 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 762 /* XXX: noisy message */ 763 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 764 "be specified for a p2p or a loopback IF only\n")); 765 return (EINVAL); 766 } 767 if (plen != 128) { 768 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 769 "be 128 when dstaddr is specified\n")); 770 return (EINVAL); 771 } 772 } 773 /* lifetime consistency check */ 774 lt = &ifra->ifra_lifetime; 775 if (lt->ia6t_pltime > lt->ia6t_vltime) 776 return (EINVAL); 777 if (lt->ia6t_vltime == 0) { 778 /* 779 * the following log might be noisy, but this is a typical 780 * configuration mistake or a tool's bug. 781 */ 782 nd6log((LOG_INFO, 783 "in6_update_ifa: valid lifetime is 0 for %s\n", 784 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr))); 785 786 if (ia == NULL) 787 return (0); /* there's nothing to do */ 788 } 789 790 /* 791 * If this is a new address, allocate a new ifaddr and link it 792 * into chains. 793 */ 794 if (ia == NULL) { 795 hostIsNew = 1; 796 /* 797 * When in6_update_ifa() is called in a process of a received 798 * RA, it is called under an interrupt context. So, we should 799 * call malloc with M_NOWAIT. 800 */ 801 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR, 802 M_NOWAIT); 803 if (ia == NULL) 804 return (ENOBUFS); 805 bzero((caddr_t)ia, sizeof(*ia)); 806 ifa_init(&ia->ia_ifa); 807 LIST_INIT(&ia->ia6_memberships); 808 /* Initialize the address and masks, and put time stamp */ 809 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 810 ia->ia_addr.sin6_family = AF_INET6; 811 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 812 ia->ia6_createtime = time_second; 813 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 814 /* 815 * XXX: some functions expect that ifa_dstaddr is not 816 * NULL for p2p interfaces. 817 */ 818 ia->ia_ifa.ifa_dstaddr = 819 (struct sockaddr *)&ia->ia_dstaddr; 820 } else { 821 ia->ia_ifa.ifa_dstaddr = NULL; 822 } 823 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 824 ia->ia_ifp = ifp; 825 ifa_ref(&ia->ia_ifa); /* if_addrhead */ 826 IF_ADDR_LOCK(ifp); 827 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 828 IF_ADDR_UNLOCK(ifp); 829 830 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */ 831 IN6_IFADDR_WLOCK(); 832 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link); 833 IN6_IFADDR_WUNLOCK(); 834 } 835 836 /* update timestamp */ 837 ia->ia6_updatetime = time_second; 838 839 /* set prefix mask */ 840 if (ifra->ifra_prefixmask.sin6_len) { 841 /* 842 * We prohibit changing the prefix length of an existing 843 * address, because 844 * + such an operation should be rare in IPv6, and 845 * + the operation would confuse prefix management. 846 */ 847 if (ia->ia_prefixmask.sin6_len && 848 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 849 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an" 850 " existing (%s) address should not be changed\n", 851 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 852 error = EINVAL; 853 goto unlink; 854 } 855 ia->ia_prefixmask = ifra->ifra_prefixmask; 856 } 857 858 /* 859 * If a new destination address is specified, scrub the old one and 860 * install the new destination. Note that the interface must be 861 * p2p or loopback (see the check above.) 862 */ 863 if (dst6.sin6_family == AF_INET6 && 864 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 865 int e; 866 867 if ((ia->ia_flags & IFA_ROUTE) != 0 && 868 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) { 869 nd6log((LOG_ERR, "in6_update_ifa: failed to remove " 870 "a route to the old destination: %s\n", 871 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 872 /* proceed anyway... */ 873 } else 874 ia->ia_flags &= ~IFA_ROUTE; 875 ia->ia_dstaddr = dst6; 876 } 877 878 /* 879 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 880 * to see if the address is deprecated or invalidated, but initialize 881 * these members for applications. 882 */ 883 ia->ia6_lifetime = ifra->ifra_lifetime; 884 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 885 ia->ia6_lifetime.ia6t_expire = 886 time_second + ia->ia6_lifetime.ia6t_vltime; 887 } else 888 ia->ia6_lifetime.ia6t_expire = 0; 889 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 890 ia->ia6_lifetime.ia6t_preferred = 891 time_second + ia->ia6_lifetime.ia6t_pltime; 892 } else 893 ia->ia6_lifetime.ia6t_preferred = 0; 894 895 /* reset the interface and routing table appropriately. */ 896 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 897 goto unlink; 898 899 /* 900 * configure address flags. 901 */ 902 ia->ia6_flags = ifra->ifra_flags; 903 /* 904 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 905 * userland, make it deprecated. 906 */ 907 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 908 ia->ia6_lifetime.ia6t_pltime = 0; 909 ia->ia6_lifetime.ia6t_preferred = time_second; 910 } 911 /* 912 * Make the address tentative before joining multicast addresses, 913 * so that corresponding MLD responses would not have a tentative 914 * source address. 915 */ 916 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 917 if (hostIsNew && in6if_do_dad(ifp)) 918 ia->ia6_flags |= IN6_IFF_TENTATIVE; 919 920 /* DAD should be performed after ND6_IFF_IFDISABLED is cleared. */ 921 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 922 ia->ia6_flags |= IN6_IFF_TENTATIVE; 923 924 /* 925 * We are done if we have simply modified an existing address. 926 */ 927 if (!hostIsNew) 928 return (error); 929 930 /* 931 * Beyond this point, we should call in6_purgeaddr upon an error, 932 * not just go to unlink. 933 */ 934 935 /* Join necessary multicast groups */ 936 in6m_sol = NULL; 937 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 938 struct sockaddr_in6 mltaddr, mltmask; 939 struct in6_addr llsol; 940 941 /* join solicited multicast addr for new host id */ 942 bzero(&llsol, sizeof(struct in6_addr)); 943 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL; 944 llsol.s6_addr32[1] = 0; 945 llsol.s6_addr32[2] = htonl(1); 946 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 947 llsol.s6_addr8[12] = 0xff; 948 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) { 949 /* XXX: should not happen */ 950 log(LOG_ERR, "in6_update_ifa: " 951 "in6_setscope failed\n"); 952 goto cleanup; 953 } 954 delay = 0; 955 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 956 /* 957 * We need a random delay for DAD on the address 958 * being configured. It also means delaying 959 * transmission of the corresponding MLD report to 960 * avoid report collision. 961 * [RFC 4861, Section 6.3.7] 962 */ 963 delay = arc4random() % 964 (MAX_RTR_SOLICITATION_DELAY * hz); 965 } 966 imm = in6_joingroup(ifp, &llsol, &error, delay); 967 if (imm == NULL) { 968 nd6log((LOG_WARNING, 969 "in6_update_ifa: addmulti failed for " 970 "%s on %s (errno=%d)\n", 971 ip6_sprintf(ip6buf, &llsol), if_name(ifp), 972 error)); 973 goto cleanup; 974 } 975 LIST_INSERT_HEAD(&ia->ia6_memberships, 976 imm, i6mm_chain); 977 in6m_sol = imm->i6mm_maddr; 978 979 bzero(&mltmask, sizeof(mltmask)); 980 mltmask.sin6_len = sizeof(struct sockaddr_in6); 981 mltmask.sin6_family = AF_INET6; 982 mltmask.sin6_addr = in6mask32; 983#define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */ 984 985 /* 986 * join link-local all-nodes address 987 */ 988 bzero(&mltaddr, sizeof(mltaddr)); 989 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 990 mltaddr.sin6_family = AF_INET6; 991 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 992 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 993 0) 994 goto cleanup; /* XXX: should not fail */ 995 996 /* 997 * XXX: do we really need this automatic routes? 998 * We should probably reconsider this stuff. Most applications 999 * actually do not need the routes, since they usually specify 1000 * the outgoing interface. 1001 */ 1002 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL); 1003 if (rt) { 1004 /* XXX: only works in !SCOPEDROUTING case. */ 1005 if (memcmp(&mltaddr.sin6_addr, 1006 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, 1007 MLTMASK_LEN)) { 1008 RTFREE_LOCKED(rt); 1009 rt = NULL; 1010 } 1011 } 1012 if (!rt) { 1013 error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr, 1014 (struct sockaddr *)&ia->ia_addr, 1015 (struct sockaddr *)&mltmask, RTF_UP, 1016 (struct rtentry **)0); 1017 if (error) 1018 goto cleanup; 1019 } else { 1020 RTFREE_LOCKED(rt); 1021 } 1022 1023 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1024 if (!imm) { 1025 nd6log((LOG_WARNING, 1026 "in6_update_ifa: addmulti failed for " 1027 "%s on %s (errno=%d)\n", 1028 ip6_sprintf(ip6buf, &mltaddr.sin6_addr), 1029 if_name(ifp), error)); 1030 goto cleanup; 1031 } 1032 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1033 1034 /* 1035 * join node information group address 1036 */ 1037 delay = 0; 1038 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1039 /* 1040 * The spec doesn't say anything about delay for this 1041 * group, but the same logic should apply. 1042 */ 1043 delay = arc4random() % 1044 (MAX_RTR_SOLICITATION_DELAY * hz); 1045 } 1046 if (in6_nigroup(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) { 1047 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 1048 delay); /* XXX jinmei */ 1049 if (!imm) { 1050 nd6log((LOG_WARNING, "in6_update_ifa: " 1051 "addmulti failed for %s on %s " 1052 "(errno=%d)\n", 1053 ip6_sprintf(ip6buf, &mltaddr.sin6_addr), 1054 if_name(ifp), error)); 1055 /* XXX not very fatal, go on... */ 1056 } else { 1057 LIST_INSERT_HEAD(&ia->ia6_memberships, 1058 imm, i6mm_chain); 1059 } 1060 } 1061 1062 /* 1063 * join interface-local all-nodes address. 1064 * (ff01::1%ifN, and ff01::%ifN/32) 1065 */ 1066 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1067 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) 1068 != 0) 1069 goto cleanup; /* XXX: should not fail */ 1070 /* XXX: again, do we really need the route? */ 1071 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL); 1072 if (rt) { 1073 if (memcmp(&mltaddr.sin6_addr, 1074 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, 1075 MLTMASK_LEN)) { 1076 RTFREE_LOCKED(rt); 1077 rt = NULL; 1078 } 1079 } 1080 if (!rt) { 1081 error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr, 1082 (struct sockaddr *)&ia->ia_addr, 1083 (struct sockaddr *)&mltmask, RTF_UP, 1084 (struct rtentry **)0); 1085 if (error) 1086 goto cleanup; 1087 } else 1088 RTFREE_LOCKED(rt); 1089 1090 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1091 if (!imm) { 1092 nd6log((LOG_WARNING, "in6_update_ifa: " 1093 "addmulti failed for %s on %s " 1094 "(errno=%d)\n", 1095 ip6_sprintf(ip6buf, &mltaddr.sin6_addr), 1096 if_name(ifp), error)); 1097 goto cleanup; 1098 } 1099 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1100#undef MLTMASK_LEN 1101 } 1102 1103 /* 1104 * Perform DAD, if needed. 1105 * XXX It may be of use, if we can administratively 1106 * disable DAD. 1107 */ 1108 if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && 1109 (ia->ia6_flags & IN6_IFF_TENTATIVE)) 1110 { 1111 int mindelay, maxdelay; 1112 1113 delay = 0; 1114 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1115 /* 1116 * We need to impose a delay before sending an NS 1117 * for DAD. Check if we also needed a delay for the 1118 * corresponding MLD message. If we did, the delay 1119 * should be larger than the MLD delay (this could be 1120 * relaxed a bit, but this simple logic is at least 1121 * safe). 1122 * XXX: Break data hiding guidelines and look at 1123 * state for the solicited multicast group. 1124 */ 1125 mindelay = 0; 1126 if (in6m_sol != NULL && 1127 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) { 1128 mindelay = in6m_sol->in6m_timer; 1129 } 1130 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1131 if (maxdelay - mindelay == 0) 1132 delay = 0; 1133 else { 1134 delay = 1135 (arc4random() % (maxdelay - mindelay)) + 1136 mindelay; 1137 } 1138 } 1139 nd6_dad_start((struct ifaddr *)ia, delay); 1140 } 1141 1142 KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew")); 1143 ifa_free(&ia->ia_ifa); 1144 return (error); 1145 1146 unlink: 1147 /* 1148 * XXX: if a change of an existing address failed, keep the entry 1149 * anyway. 1150 */ 1151 if (hostIsNew) { 1152 in6_unlink_ifa(ia, ifp); 1153 ifa_free(&ia->ia_ifa); 1154 } 1155 return (error); 1156 1157 cleanup: 1158 KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew")); 1159 ifa_free(&ia->ia_ifa); 1160 in6_purgeaddr(&ia->ia_ifa); 1161 return error; 1162} 1163 1164void 1165in6_purgeaddr(struct ifaddr *ifa) 1166{ 1167 struct ifnet *ifp = ifa->ifa_ifp; 1168 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1169 struct in6_multi_mship *imm; 1170 struct sockaddr_in6 mltaddr, mltmask; 1171 struct rtentry rt0; 1172 struct sockaddr_dl gateway; 1173 struct sockaddr_in6 mask, addr; 1174 int plen, error; 1175 struct rtentry *rt; 1176 struct ifaddr *ifa0, *nifa; 1177 1178 /* 1179 * find another IPv6 address as the gateway for the 1180 * link-local and node-local all-nodes multicast 1181 * address routes 1182 */ 1183 IF_ADDR_LOCK(ifp); 1184 TAILQ_FOREACH_SAFE(ifa0, &ifp->if_addrhead, ifa_link, nifa) { 1185 if ((ifa0->ifa_addr->sa_family != AF_INET6) || 1186 memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr, 1187 &ia->ia_addr.sin6_addr, 1188 sizeof(struct in6_addr)) == 0) 1189 continue; 1190 else 1191 break; 1192 } 1193 if (ifa0 != NULL) 1194 ifa_ref(ifa0); 1195 IF_ADDR_UNLOCK(ifp); 1196 1197 /* 1198 * Remove the loopback route to the interface address. 1199 * The check for the current setting of "nd6_useloopback" 1200 * is not needed. 1201 */ 1202 { 1203 struct rt_addrinfo info; 1204 struct sockaddr_dl null_sdl; 1205 1206 bzero(&null_sdl, sizeof(null_sdl)); 1207 null_sdl.sdl_len = sizeof(null_sdl); 1208 null_sdl.sdl_family = AF_LINK; 1209 null_sdl.sdl_type = ia->ia_ifp->if_type; 1210 null_sdl.sdl_index = ia->ia_ifp->if_index; 1211 bzero(&info, sizeof(info)); 1212 info.rti_flags = ia->ia_flags | RTF_HOST | RTF_STATIC; 1213 info.rti_info[RTAX_DST] = (struct sockaddr *)&ia->ia_addr; 1214 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1215 error = rtrequest1_fib(RTM_DELETE, &info, NULL, 0); 1216 1217 if (error != 0) 1218 log(LOG_INFO, "in6_purgeaddr: deletion failed\n"); 1219 } 1220 1221 /* stop DAD processing */ 1222 nd6_dad_stop(ifa); 1223 1224 IF_AFDATA_LOCK(ifp); 1225 lla_lookup(LLTABLE6(ifp), (LLE_DELETE | LLE_IFADDR), 1226 (struct sockaddr *)&ia->ia_addr); 1227 IF_AFDATA_UNLOCK(ifp); 1228 1229 /* 1230 * initialize for rtmsg generation 1231 */ 1232 bzero(&gateway, sizeof(gateway)); 1233 gateway.sdl_len = sizeof(gateway); 1234 gateway.sdl_family = AF_LINK; 1235 gateway.sdl_nlen = 0; 1236 gateway.sdl_alen = ifp->if_addrlen; 1237 /* */ 1238 bzero(&rt0, sizeof(rt0)); 1239 rt0.rt_gateway = (struct sockaddr *)&gateway; 1240 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 1241 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr)); 1242 rt_mask(&rt0) = (struct sockaddr *)&mask; 1243 rt_key(&rt0) = (struct sockaddr *)&addr; 1244 rt0.rt_flags = RTF_HOST | RTF_STATIC; 1245 rt_newaddrmsg(RTM_DELETE, ifa, 0, &rt0); 1246 1247 /* 1248 * leave from multicast groups we have joined for the interface 1249 */ 1250 while ((imm = ia->ia6_memberships.lh_first) != NULL) { 1251 LIST_REMOVE(imm, i6mm_chain); 1252 in6_leavegroup(imm); 1253 } 1254 1255 /* 1256 * remove the link-local all-nodes address 1257 */ 1258 bzero(&mltmask, sizeof(mltmask)); 1259 mltmask.sin6_len = sizeof(struct sockaddr_in6); 1260 mltmask.sin6_family = AF_INET6; 1261 mltmask.sin6_addr = in6mask32; 1262 1263 bzero(&mltaddr, sizeof(mltaddr)); 1264 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 1265 mltaddr.sin6_family = AF_INET6; 1266 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 1267 1268 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 1269 0) 1270 goto cleanup; 1271 1272 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL); 1273 if (rt != NULL && rt->rt_gateway != NULL && 1274 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 1275 &ia->ia_addr.sin6_addr, 1276 sizeof(ia->ia_addr.sin6_addr)) == 0)) { 1277 /* 1278 * if no more IPv6 address exists on this interface 1279 * then remove the multicast address route 1280 */ 1281 if (ifa0 == NULL) { 1282 memcpy(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr, 1283 sizeof(mltaddr.sin6_addr)); 1284 RTFREE_LOCKED(rt); 1285 error = rtrequest(RTM_DELETE, (struct sockaddr *)&mltaddr, 1286 (struct sockaddr *)&ia->ia_addr, 1287 (struct sockaddr *)&mltmask, RTF_UP, 1288 (struct rtentry **)0); 1289 if (error) 1290 log(LOG_INFO, "in6_purgeaddr: link-local all-nodes" 1291 "multicast address deletion error\n"); 1292 } else { 1293 /* 1294 * replace the gateway of the route 1295 */ 1296 struct sockaddr_in6 sa; 1297 1298 bzero(&sa, sizeof(sa)); 1299 sa.sin6_len = sizeof(struct sockaddr_in6); 1300 sa.sin6_family = AF_INET6; 1301 memcpy(&sa.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, 1302 sizeof(sa.sin6_addr)); 1303 in6_setscope(&sa.sin6_addr, ifa0->ifa_ifp, NULL); 1304 memcpy(rt->rt_gateway, &sa, sizeof(sa)); 1305 RTFREE_LOCKED(rt); 1306 } 1307 } else { 1308 if (rt != NULL) 1309 RTFREE_LOCKED(rt); 1310 } 1311 1312 /* 1313 * remove the node-local all-nodes address 1314 */ 1315 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1316 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 1317 0) 1318 goto cleanup; 1319 1320 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL); 1321 if (rt != NULL && rt->rt_gateway != NULL && 1322 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 1323 &ia->ia_addr.sin6_addr, 1324 sizeof(ia->ia_addr.sin6_addr)) == 0)) { 1325 /* 1326 * if no more IPv6 address exists on this interface 1327 * then remove the multicast address route 1328 */ 1329 if (ifa0 == NULL) { 1330 memcpy(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr, 1331 sizeof(mltaddr.sin6_addr)); 1332 1333 RTFREE_LOCKED(rt); 1334 error = rtrequest(RTM_DELETE, (struct sockaddr *)&mltaddr, 1335 (struct sockaddr *)&ia->ia_addr, 1336 (struct sockaddr *)&mltmask, RTF_UP, 1337 (struct rtentry **)0); 1338 1339 if (error) 1340 log(LOG_INFO, "in6_purgeaddr: node-local all-nodes" 1341 "multicast address deletion error\n"); 1342 } else { 1343 /* 1344 * replace the gateway of the route 1345 */ 1346 struct sockaddr_in6 sa; 1347 1348 bzero(&sa, sizeof(sa)); 1349 sa.sin6_len = sizeof(struct sockaddr_in6); 1350 sa.sin6_family = AF_INET6; 1351 memcpy(&sa.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, 1352 sizeof(sa.sin6_addr)); 1353 in6_setscope(&sa.sin6_addr, ifa0->ifa_ifp, NULL); 1354 memcpy(rt->rt_gateway, &sa, sizeof(sa)); 1355 RTFREE_LOCKED(rt); 1356 } 1357 } else { 1358 if (rt != NULL) 1359 RTFREE_LOCKED(rt); 1360 } 1361 1362cleanup: 1363 1364 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1365 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) { 1366 int error; 1367 struct sockaddr *dstaddr; 1368 1369 /* 1370 * use the interface address if configuring an 1371 * interface address with a /128 prefix len 1372 */ 1373 if (ia->ia_dstaddr.sin6_family == AF_INET6) 1374 dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 1375 else 1376 dstaddr = (struct sockaddr *)&ia->ia_addr; 1377 1378 error = rtrequest(RTM_DELETE, 1379 (struct sockaddr *)dstaddr, 1380 (struct sockaddr *)&ia->ia_addr, 1381 (struct sockaddr *)&ia->ia_prefixmask, 1382 ia->ia_flags | RTF_HOST, NULL); 1383 if (error != 0) 1384 return; 1385 ia->ia_flags &= ~IFA_ROUTE; 1386 } 1387 if (ifa0 != NULL) 1388 ifa_free(ifa0); 1389 1390 in6_unlink_ifa(ia, ifp); 1391} 1392 1393static void 1394in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1395{ 1396 int s = splnet(); 1397 1398 IF_ADDR_LOCK(ifp); 1399 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1400 IF_ADDR_UNLOCK(ifp); 1401 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1402 1403 /* 1404 * Defer the release of what might be the last reference to the 1405 * in6_ifaddr so that it can't be freed before the remainder of the 1406 * cleanup. 1407 */ 1408 IN6_IFADDR_WLOCK(); 1409 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 1410 IN6_IFADDR_WUNLOCK(); 1411 1412 /* 1413 * Release the reference to the base prefix. There should be a 1414 * positive reference. 1415 */ 1416 if (ia->ia6_ndpr == NULL) { 1417 nd6log((LOG_NOTICE, 1418 "in6_unlink_ifa: autoconf'ed address " 1419 "%p has no prefix\n", ia)); 1420 } else { 1421 ia->ia6_ndpr->ndpr_refcnt--; 1422 ia->ia6_ndpr = NULL; 1423 } 1424 1425 /* 1426 * Also, if the address being removed is autoconf'ed, call 1427 * pfxlist_onlink_check() since the release might affect the status of 1428 * other (detached) addresses. 1429 */ 1430 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1431 pfxlist_onlink_check(); 1432 } 1433 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1434 splx(s); 1435} 1436 1437void 1438in6_purgeif(struct ifnet *ifp) 1439{ 1440 struct ifaddr *ifa, *nifa; 1441 1442 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) { 1443 if (ifa->ifa_addr->sa_family != AF_INET6) 1444 continue; 1445 in6_purgeaddr(ifa); 1446 } 1447 1448 in6_ifdetach(ifp); 1449} 1450 1451/* 1452 * SIOC[GAD]LIFADDR. 1453 * SIOCGLIFADDR: get first address. (?) 1454 * SIOCGLIFADDR with IFLR_PREFIX: 1455 * get first address that matches the specified prefix. 1456 * SIOCALIFADDR: add the specified address. 1457 * SIOCALIFADDR with IFLR_PREFIX: 1458 * add the specified prefix, filling hostid part from 1459 * the first link-local address. prefixlen must be <= 64. 1460 * SIOCDLIFADDR: delete the specified address. 1461 * SIOCDLIFADDR with IFLR_PREFIX: 1462 * delete the first address that matches the specified prefix. 1463 * return values: 1464 * EINVAL on invalid parameters 1465 * EADDRNOTAVAIL on prefix match failed/specified address not found 1466 * other values may be returned from in6_ioctl() 1467 * 1468 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1469 * this is to accomodate address naming scheme other than RFC2374, 1470 * in the future. 1471 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1472 * address encoding scheme. (see figure on page 8) 1473 */ 1474static int 1475in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 1476 struct ifnet *ifp, struct thread *td) 1477{ 1478 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1479 struct ifaddr *ifa; 1480 struct sockaddr *sa; 1481 1482 /* sanity checks */ 1483 if (!data || !ifp) { 1484 panic("invalid argument to in6_lifaddr_ioctl"); 1485 /* NOTREACHED */ 1486 } 1487 1488 switch (cmd) { 1489 case SIOCGLIFADDR: 1490 /* address must be specified on GET with IFLR_PREFIX */ 1491 if ((iflr->flags & IFLR_PREFIX) == 0) 1492 break; 1493 /* FALLTHROUGH */ 1494 case SIOCALIFADDR: 1495 case SIOCDLIFADDR: 1496 /* address must be specified on ADD and DELETE */ 1497 sa = (struct sockaddr *)&iflr->addr; 1498 if (sa->sa_family != AF_INET6) 1499 return EINVAL; 1500 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1501 return EINVAL; 1502 /* XXX need improvement */ 1503 sa = (struct sockaddr *)&iflr->dstaddr; 1504 if (sa->sa_family && sa->sa_family != AF_INET6) 1505 return EINVAL; 1506 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1507 return EINVAL; 1508 break; 1509 default: /* shouldn't happen */ 1510#if 0 1511 panic("invalid cmd to in6_lifaddr_ioctl"); 1512 /* NOTREACHED */ 1513#else 1514 return EOPNOTSUPP; 1515#endif 1516 } 1517 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) 1518 return EINVAL; 1519 1520 switch (cmd) { 1521 case SIOCALIFADDR: 1522 { 1523 struct in6_aliasreq ifra; 1524 struct in6_addr *hostid = NULL; 1525 int prefixlen; 1526 1527 ifa = NULL; 1528 if ((iflr->flags & IFLR_PREFIX) != 0) { 1529 struct sockaddr_in6 *sin6; 1530 1531 /* 1532 * hostid is to fill in the hostid part of the 1533 * address. hostid points to the first link-local 1534 * address attached to the interface. 1535 */ 1536 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1537 if (!ifa) 1538 return EADDRNOTAVAIL; 1539 hostid = IFA_IN6(ifa); 1540 1541 /* prefixlen must be <= 64. */ 1542 if (64 < iflr->prefixlen) 1543 return EINVAL; 1544 prefixlen = iflr->prefixlen; 1545 1546 /* hostid part must be zero. */ 1547 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1548 if (sin6->sin6_addr.s6_addr32[2] != 0 || 1549 sin6->sin6_addr.s6_addr32[3] != 0) { 1550 return EINVAL; 1551 } 1552 } else 1553 prefixlen = iflr->prefixlen; 1554 1555 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1556 bzero(&ifra, sizeof(ifra)); 1557 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name)); 1558 1559 bcopy(&iflr->addr, &ifra.ifra_addr, 1560 ((struct sockaddr *)&iflr->addr)->sa_len); 1561 if (hostid) { 1562 /* fill in hostid part */ 1563 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1564 hostid->s6_addr32[2]; 1565 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1566 hostid->s6_addr32[3]; 1567 } 1568 1569 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1570 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1571 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1572 if (hostid) { 1573 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1574 hostid->s6_addr32[2]; 1575 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1576 hostid->s6_addr32[3]; 1577 } 1578 } 1579 if (ifa != NULL) 1580 ifa_free(ifa); 1581 1582 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1583 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1584 1585 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1586 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td); 1587 } 1588 case SIOCGLIFADDR: 1589 case SIOCDLIFADDR: 1590 { 1591 struct in6_ifaddr *ia; 1592 struct in6_addr mask, candidate, match; 1593 struct sockaddr_in6 *sin6; 1594 int cmp; 1595 1596 bzero(&mask, sizeof(mask)); 1597 if (iflr->flags & IFLR_PREFIX) { 1598 /* lookup a prefix rather than address. */ 1599 in6_prefixlen2mask(&mask, iflr->prefixlen); 1600 1601 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1602 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1603 match.s6_addr32[0] &= mask.s6_addr32[0]; 1604 match.s6_addr32[1] &= mask.s6_addr32[1]; 1605 match.s6_addr32[2] &= mask.s6_addr32[2]; 1606 match.s6_addr32[3] &= mask.s6_addr32[3]; 1607 1608 /* if you set extra bits, that's wrong */ 1609 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1610 return EINVAL; 1611 1612 cmp = 1; 1613 } else { 1614 if (cmd == SIOCGLIFADDR) { 1615 /* on getting an address, take the 1st match */ 1616 cmp = 0; /* XXX */ 1617 } else { 1618 /* on deleting an address, do exact match */ 1619 in6_prefixlen2mask(&mask, 128); 1620 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1621 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1622 1623 cmp = 1; 1624 } 1625 } 1626 1627 IF_ADDR_LOCK(ifp); 1628 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1629 if (ifa->ifa_addr->sa_family != AF_INET6) 1630 continue; 1631 if (!cmp) 1632 break; 1633 1634 /* 1635 * XXX: this is adhoc, but is necessary to allow 1636 * a user to specify fe80::/64 (not /10) for a 1637 * link-local address. 1638 */ 1639 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1640 in6_clearscope(&candidate); 1641 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1642 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1643 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1644 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1645 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1646 break; 1647 } 1648 IF_ADDR_UNLOCK(ifp); 1649 if (!ifa) 1650 return EADDRNOTAVAIL; 1651 ia = ifa2ia6(ifa); 1652 1653 if (cmd == SIOCGLIFADDR) { 1654 int error; 1655 1656 /* fill in the if_laddrreq structure */ 1657 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1658 error = sa6_recoverscope( 1659 (struct sockaddr_in6 *)&iflr->addr); 1660 if (error != 0) 1661 return (error); 1662 1663 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1664 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1665 ia->ia_dstaddr.sin6_len); 1666 error = sa6_recoverscope( 1667 (struct sockaddr_in6 *)&iflr->dstaddr); 1668 if (error != 0) 1669 return (error); 1670 } else 1671 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1672 1673 iflr->prefixlen = 1674 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1675 1676 iflr->flags = ia->ia6_flags; /* XXX */ 1677 1678 return 0; 1679 } else { 1680 struct in6_aliasreq ifra; 1681 1682 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1683 bzero(&ifra, sizeof(ifra)); 1684 bcopy(iflr->iflr_name, ifra.ifra_name, 1685 sizeof(ifra.ifra_name)); 1686 1687 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1688 ia->ia_addr.sin6_len); 1689 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1690 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1691 ia->ia_dstaddr.sin6_len); 1692 } else { 1693 bzero(&ifra.ifra_dstaddr, 1694 sizeof(ifra.ifra_dstaddr)); 1695 } 1696 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1697 ia->ia_prefixmask.sin6_len); 1698 1699 ifra.ifra_flags = ia->ia6_flags; 1700 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, 1701 ifp, td); 1702 } 1703 } 1704 } 1705 1706 return EOPNOTSUPP; /* just for safety */ 1707} 1708 1709/* 1710 * Initialize an interface's intetnet6 address 1711 * and routing table entry. 1712 */ 1713static int 1714in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1715 struct sockaddr_in6 *sin6, int newhost) 1716{ 1717 int error = 0, plen, ifacount = 0; 1718 int s = splimp(); 1719 struct ifaddr *ifa; 1720 1721 /* 1722 * Give the interface a chance to initialize 1723 * if this is its first address, 1724 * and to validate the address if necessary. 1725 */ 1726 IF_ADDR_LOCK(ifp); 1727 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1728 if (ifa->ifa_addr->sa_family != AF_INET6) 1729 continue; 1730 ifacount++; 1731 } 1732 IF_ADDR_UNLOCK(ifp); 1733 1734 ia->ia_addr = *sin6; 1735 1736 if (ifacount <= 1 && ifp->if_ioctl) { 1737 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1738 if (error) { 1739 splx(s); 1740 return (error); 1741 } 1742 } 1743 splx(s); 1744 1745 ia->ia_ifa.ifa_metric = ifp->if_metric; 1746 1747 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1748 1749 /* 1750 * Special case: 1751 * If a new destination address is specified for a point-to-point 1752 * interface, install a route to the destination as an interface 1753 * direct route. 1754 * XXX: the logic below rejects assigning multiple addresses on a p2p 1755 * interface that share the same destination. 1756 */ 1757 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1758 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 && 1759 ia->ia_dstaddr.sin6_family == AF_INET6) { 1760 int rtflags = RTF_UP | RTF_HOST; 1761 1762 error = rtrequest(RTM_ADD, 1763 (struct sockaddr *)&ia->ia_dstaddr, 1764 (struct sockaddr *)&ia->ia_addr, 1765 (struct sockaddr *)&ia->ia_prefixmask, 1766 ia->ia_flags | rtflags, NULL); 1767 if (error != 0) 1768 return (error); 1769 ia->ia_flags |= IFA_ROUTE; 1770 } 1771 1772 /* 1773 * add a loopback route to self 1774 */ 1775 if (!(ia->ia_flags & IFA_ROUTE) 1776 && (V_nd6_useloopback 1777 || (ifp->if_flags & IFF_LOOPBACK))) { 1778 struct rt_addrinfo info; 1779 struct rtentry *rt = NULL; 1780 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1781 1782 bzero(&info, sizeof(info)); 1783 info.rti_ifp = V_loif; 1784 info.rti_flags = ia->ia_flags | RTF_HOST | RTF_STATIC; 1785 info.rti_info[RTAX_DST] = (struct sockaddr *)&ia->ia_addr; 1786 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&null_sdl; 1787 error = rtrequest1_fib(RTM_ADD, &info, &rt, 0); 1788 1789 if (error == 0 && rt != NULL) { 1790 RT_LOCK(rt); 1791 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 1792 ifp->if_type; 1793 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 1794 ifp->if_index; 1795 RT_REMREF(rt); 1796 RT_UNLOCK(rt); 1797 } else if (error != 0) 1798 log(LOG_INFO, "in6_ifinit: error = %d, insertion failed\n", error); 1799 } 1800 1801 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1802 if (newhost) { 1803 struct llentry *ln; 1804 struct rtentry rt; 1805 struct sockaddr_dl gateway; 1806 struct sockaddr_in6 mask, addr; 1807 1808 IF_AFDATA_LOCK(ifp); 1809 ia->ia_ifa.ifa_rtrequest = NULL; 1810 1811 /* XXX QL 1812 * we need to report rt_newaddrmsg 1813 */ 1814 ln = lla_lookup(LLTABLE6(ifp), (LLE_CREATE | LLE_IFADDR | LLE_EXCLUSIVE), 1815 (struct sockaddr *)&ia->ia_addr); 1816 IF_AFDATA_UNLOCK(ifp); 1817 if (ln != NULL) { 1818 ln->la_expire = 0; /* for IPv6 this means permanent */ 1819 ln->ln_state = ND6_LLINFO_REACHABLE; 1820 /* 1821 * initialize for rtmsg generation 1822 */ 1823 bzero(&gateway, sizeof(gateway)); 1824 gateway.sdl_len = sizeof(gateway); 1825 gateway.sdl_family = AF_LINK; 1826 gateway.sdl_nlen = 0; 1827 gateway.sdl_alen = 6; 1828 memcpy(gateway.sdl_data, &ln->ll_addr.mac_aligned, sizeof(ln->ll_addr)); 1829 /* */ 1830 LLE_WUNLOCK(ln); 1831 } 1832 1833 bzero(&rt, sizeof(rt)); 1834 rt.rt_gateway = (struct sockaddr *)&gateway; 1835 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 1836 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr)); 1837 rt_mask(&rt) = (struct sockaddr *)&mask; 1838 rt_key(&rt) = (struct sockaddr *)&addr; 1839 rt.rt_flags = RTF_UP | RTF_HOST | RTF_STATIC; 1840 rt_newaddrmsg(RTM_ADD, &ia->ia_ifa, 0, &rt); 1841 } 1842 1843 return (error); 1844} 1845 1846/* 1847 * Find an IPv6 interface link-local address specific to an interface. 1848 * ifaddr is returned referenced. 1849 */ 1850struct in6_ifaddr * 1851in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1852{ 1853 struct ifaddr *ifa; 1854 1855 IF_ADDR_LOCK(ifp); 1856 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1857 if (ifa->ifa_addr->sa_family != AF_INET6) 1858 continue; 1859 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1860 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1861 ignoreflags) != 0) 1862 continue; 1863 ifa_ref(ifa); 1864 break; 1865 } 1866 } 1867 IF_ADDR_UNLOCK(ifp); 1868 1869 return ((struct in6_ifaddr *)ifa); 1870} 1871 1872 1873/* 1874 * find the internet address corresponding to a given interface and address. 1875 * ifaddr is returned referenced. 1876 */ 1877struct in6_ifaddr * 1878in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr) 1879{ 1880 struct ifaddr *ifa; 1881 1882 IF_ADDR_LOCK(ifp); 1883 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1884 if (ifa->ifa_addr->sa_family != AF_INET6) 1885 continue; 1886 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1887 ifa_ref(ifa); 1888 break; 1889 } 1890 } 1891 IF_ADDR_UNLOCK(ifp); 1892 1893 return ((struct in6_ifaddr *)ifa); 1894} 1895 1896/* 1897 * Convert IP6 address to printable (loggable) representation. Caller 1898 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 1899 */ 1900static char digits[] = "0123456789abcdef"; 1901char * 1902ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 1903{ 1904 int i; 1905 char *cp; 1906 const u_int16_t *a = (const u_int16_t *)addr; 1907 const u_int8_t *d; 1908 int dcolon = 0, zero = 0; 1909 1910 cp = ip6buf; 1911 1912 for (i = 0; i < 8; i++) { 1913 if (dcolon == 1) { 1914 if (*a == 0) { 1915 if (i == 7) 1916 *cp++ = ':'; 1917 a++; 1918 continue; 1919 } else 1920 dcolon = 2; 1921 } 1922 if (*a == 0) { 1923 if (dcolon == 0 && *(a + 1) == 0) { 1924 if (i == 0) 1925 *cp++ = ':'; 1926 *cp++ = ':'; 1927 dcolon = 1; 1928 } else { 1929 *cp++ = '0'; 1930 *cp++ = ':'; 1931 } 1932 a++; 1933 continue; 1934 } 1935 d = (const u_char *)a; 1936 /* Try to eliminate leading zeros in printout like in :0001. */ 1937 zero = 1; 1938 *cp = digits[*d >> 4]; 1939 if (*cp != '0') { 1940 zero = 0; 1941 cp++; 1942 } 1943 *cp = digits[*d++ & 0xf]; 1944 if (zero == 0 || (*cp != '0')) { 1945 zero = 0; 1946 cp++; 1947 } 1948 *cp = digits[*d >> 4]; 1949 if (zero == 0 || (*cp != '0')) { 1950 zero = 0; 1951 cp++; 1952 } 1953 *cp++ = digits[*d & 0xf]; 1954 *cp++ = ':'; 1955 a++; 1956 } 1957 *--cp = '\0'; 1958 return (ip6buf); 1959} 1960 1961int 1962in6_localaddr(struct in6_addr *in6) 1963{ 1964 struct in6_ifaddr *ia; 1965 1966 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1967 return 1; 1968 1969 IN6_IFADDR_RLOCK(); 1970 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 1971 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1972 &ia->ia_prefixmask.sin6_addr)) { 1973 IN6_IFADDR_RUNLOCK(); 1974 return 1; 1975 } 1976 } 1977 IN6_IFADDR_RUNLOCK(); 1978 1979 return (0); 1980} 1981 1982int 1983in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1984{ 1985 struct in6_ifaddr *ia; 1986 1987 IN6_IFADDR_RLOCK(); 1988 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 1989 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1990 &sa6->sin6_addr) && 1991 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) { 1992 IN6_IFADDR_RUNLOCK(); 1993 return (1); /* true */ 1994 } 1995 1996 /* XXX: do we still have to go thru the rest of the list? */ 1997 } 1998 IN6_IFADDR_RUNLOCK(); 1999 2000 return (0); /* false */ 2001} 2002 2003/* 2004 * return length of part which dst and src are equal 2005 * hard coding... 2006 */ 2007int 2008in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 2009{ 2010 int match = 0; 2011 u_char *s = (u_char *)src, *d = (u_char *)dst; 2012 u_char *lim = s + 16, r; 2013 2014 while (s < lim) 2015 if ((r = (*d++ ^ *s++)) != 0) { 2016 while (r < 128) { 2017 match++; 2018 r <<= 1; 2019 } 2020 break; 2021 } else 2022 match += 8; 2023 return match; 2024} 2025 2026/* XXX: to be scope conscious */ 2027int 2028in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 2029{ 2030 int bytelen, bitlen; 2031 2032 /* sanity check */ 2033 if (0 > len || len > 128) { 2034 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 2035 len); 2036 return (0); 2037 } 2038 2039 bytelen = len / 8; 2040 bitlen = len % 8; 2041 2042 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 2043 return (0); 2044 if (bitlen != 0 && 2045 p1->s6_addr[bytelen] >> (8 - bitlen) != 2046 p2->s6_addr[bytelen] >> (8 - bitlen)) 2047 return (0); 2048 2049 return (1); 2050} 2051 2052void 2053in6_prefixlen2mask(struct in6_addr *maskp, int len) 2054{ 2055 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 2056 int bytelen, bitlen, i; 2057 2058 /* sanity check */ 2059 if (0 > len || len > 128) { 2060 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 2061 len); 2062 return; 2063 } 2064 2065 bzero(maskp, sizeof(*maskp)); 2066 bytelen = len / 8; 2067 bitlen = len % 8; 2068 for (i = 0; i < bytelen; i++) 2069 maskp->s6_addr[i] = 0xff; 2070 if (bitlen) 2071 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 2072} 2073 2074/* 2075 * return the best address out of the same scope. if no address was 2076 * found, return the first valid address from designated IF. 2077 */ 2078struct in6_ifaddr * 2079in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2080{ 2081 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2082 struct ifaddr *ifa; 2083 struct in6_ifaddr *besta = 0; 2084 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2085 2086 dep[0] = dep[1] = NULL; 2087 2088 /* 2089 * We first look for addresses in the same scope. 2090 * If there is one, return it. 2091 * If two or more, return one which matches the dst longest. 2092 * If none, return one of global addresses assigned other ifs. 2093 */ 2094 IF_ADDR_LOCK(ifp); 2095 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2096 if (ifa->ifa_addr->sa_family != AF_INET6) 2097 continue; 2098 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2099 continue; /* XXX: is there any case to allow anycast? */ 2100 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2101 continue; /* don't use this interface */ 2102 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2103 continue; 2104 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2105 if (V_ip6_use_deprecated) 2106 dep[0] = (struct in6_ifaddr *)ifa; 2107 continue; 2108 } 2109 2110 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2111 /* 2112 * call in6_matchlen() as few as possible 2113 */ 2114 if (besta) { 2115 if (blen == -1) 2116 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2117 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2118 if (tlen > blen) { 2119 blen = tlen; 2120 besta = (struct in6_ifaddr *)ifa; 2121 } 2122 } else 2123 besta = (struct in6_ifaddr *)ifa; 2124 } 2125 } 2126 if (besta) { 2127 ifa_ref(&besta->ia_ifa); 2128 IF_ADDR_UNLOCK(ifp); 2129 return (besta); 2130 } 2131 IF_ADDR_UNLOCK(ifp); 2132 2133 IN6_IFADDR_RLOCK(); 2134 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2135 if (ifa->ifa_addr->sa_family != AF_INET6) 2136 continue; 2137 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2138 continue; /* XXX: is there any case to allow anycast? */ 2139 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2140 continue; /* don't use this interface */ 2141 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2142 continue; 2143 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2144 if (V_ip6_use_deprecated) 2145 dep[1] = (struct in6_ifaddr *)ifa; 2146 continue; 2147 } 2148 2149 if (ifa != NULL) 2150 ifa_ref(ifa); 2151 IN6_IFADDR_RUNLOCK(); 2152 return (struct in6_ifaddr *)ifa; 2153 } 2154 IN6_IFADDR_RUNLOCK(); 2155 2156 /* use the last-resort values, that are, deprecated addresses */ 2157 if (dep[0]) 2158 return dep[0]; 2159 if (dep[1]) 2160 return dep[1]; 2161 2162 return NULL; 2163} 2164 2165/* 2166 * perform DAD when interface becomes IFF_UP. 2167 */ 2168void 2169in6_if_up(struct ifnet *ifp) 2170{ 2171 struct ifaddr *ifa; 2172 struct in6_ifaddr *ia; 2173 2174 IF_ADDR_LOCK(ifp); 2175 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2176 if (ifa->ifa_addr->sa_family != AF_INET6) 2177 continue; 2178 ia = (struct in6_ifaddr *)ifa; 2179 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2180 /* 2181 * The TENTATIVE flag was likely set by hand 2182 * beforehand, implicitly indicating the need for DAD. 2183 * We may be able to skip the random delay in this 2184 * case, but we impose delays just in case. 2185 */ 2186 nd6_dad_start(ifa, 2187 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 2188 } 2189 } 2190 IF_ADDR_UNLOCK(ifp); 2191 2192 /* 2193 * special cases, like 6to4, are handled in in6_ifattach 2194 */ 2195 in6_ifattach(ifp, NULL); 2196} 2197 2198int 2199in6if_do_dad(struct ifnet *ifp) 2200{ 2201 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 2202 return (0); 2203 2204 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 2205 return (0); 2206 2207 switch (ifp->if_type) { 2208#ifdef IFT_DUMMY 2209 case IFT_DUMMY: 2210#endif 2211 case IFT_FAITH: 2212 /* 2213 * These interfaces do not have the IFF_LOOPBACK flag, 2214 * but loop packets back. We do not have to do DAD on such 2215 * interfaces. We should even omit it, because loop-backed 2216 * NS would confuse the DAD procedure. 2217 */ 2218 return (0); 2219 default: 2220 /* 2221 * Our DAD routine requires the interface up and running. 2222 * However, some interfaces can be up before the RUNNING 2223 * status. Additionaly, users may try to assign addresses 2224 * before the interface becomes up (or running). 2225 * We simply skip DAD in such a case as a work around. 2226 * XXX: we should rather mark "tentative" on such addresses, 2227 * and do DAD after the interface becomes ready. 2228 */ 2229 if (!((ifp->if_flags & IFF_UP) && 2230 (ifp->if_drv_flags & IFF_DRV_RUNNING))) 2231 return (0); 2232 2233 return (1); 2234 } 2235} 2236 2237/* 2238 * Calculate max IPv6 MTU through all the interfaces and store it 2239 * to in6_maxmtu. 2240 */ 2241void 2242in6_setmaxmtu(void) 2243{ 2244 unsigned long maxmtu = 0; 2245 struct ifnet *ifp; 2246 2247 IFNET_RLOCK_NOSLEEP(); 2248 for (ifp = TAILQ_FIRST(&V_ifnet); ifp; 2249 ifp = TAILQ_NEXT(ifp, if_list)) { 2250 /* this function can be called during ifnet initialization */ 2251 if (!ifp->if_afdata[AF_INET6]) 2252 continue; 2253 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2254 IN6_LINKMTU(ifp) > maxmtu) 2255 maxmtu = IN6_LINKMTU(ifp); 2256 } 2257 IFNET_RUNLOCK_NOSLEEP(); 2258 if (maxmtu) /* update only when maxmtu is positive */ 2259 V_in6_maxmtu = maxmtu; 2260} 2261 2262/* 2263 * Provide the length of interface identifiers to be used for the link attached 2264 * to the given interface. The length should be defined in "IPv6 over 2265 * xxx-link" document. Note that address architecture might also define 2266 * the length for a particular set of address prefixes, regardless of the 2267 * link type. As clarified in rfc2462bis, those two definitions should be 2268 * consistent, and those really are as of August 2004. 2269 */ 2270int 2271in6_if2idlen(struct ifnet *ifp) 2272{ 2273 switch (ifp->if_type) { 2274 case IFT_ETHER: /* RFC2464 */ 2275#ifdef IFT_PROPVIRTUAL 2276 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2277#endif 2278#ifdef IFT_L2VLAN 2279 case IFT_L2VLAN: /* ditto */ 2280#endif 2281#ifdef IFT_IEEE80211 2282 case IFT_IEEE80211: /* ditto */ 2283#endif 2284#ifdef IFT_MIP 2285 case IFT_MIP: /* ditto */ 2286#endif 2287 return (64); 2288 case IFT_FDDI: /* RFC2467 */ 2289 return (64); 2290 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 2291 return (64); 2292 case IFT_PPP: /* RFC2472 */ 2293 return (64); 2294 case IFT_ARCNET: /* RFC2497 */ 2295 return (64); 2296 case IFT_FRELAY: /* RFC2590 */ 2297 return (64); 2298 case IFT_IEEE1394: /* RFC3146 */ 2299 return (64); 2300 case IFT_GIF: 2301 return (64); /* draft-ietf-v6ops-mech-v2-07 */ 2302 case IFT_LOOP: 2303 return (64); /* XXX: is this really correct? */ 2304 default: 2305 /* 2306 * Unknown link type: 2307 * It might be controversial to use the today's common constant 2308 * of 64 for these cases unconditionally. For full compliance, 2309 * we should return an error in this case. On the other hand, 2310 * if we simply miss the standard for the link type or a new 2311 * standard is defined for a new link type, the IFID length 2312 * is very likely to be the common constant. As a compromise, 2313 * we always use the constant, but make an explicit notice 2314 * indicating the "unknown" case. 2315 */ 2316 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2317 return (64); 2318 } 2319} 2320 2321#include <sys/sysctl.h> 2322 2323struct in6_llentry { 2324 struct llentry base; 2325 struct sockaddr_in6 l3_addr6; 2326}; 2327 2328static struct llentry * 2329in6_lltable_new(const struct sockaddr *l3addr, u_int flags) 2330{ 2331 struct in6_llentry *lle; 2332 2333 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, 2334 M_DONTWAIT | M_ZERO); 2335 if (lle == NULL) /* NB: caller generates msg */ 2336 return NULL; 2337 2338 callout_init(&lle->base.ln_timer_ch, CALLOUT_MPSAFE); 2339 lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr; 2340 lle->base.lle_refcnt = 1; 2341 LLE_LOCK_INIT(&lle->base); 2342 return &lle->base; 2343} 2344 2345/* 2346 * Deletes an address from the address table. 2347 * This function is called by the timer functions 2348 * such as arptimer() and nd6_llinfo_timer(), and 2349 * the caller does the locking. 2350 */ 2351static void 2352in6_lltable_free(struct lltable *llt, struct llentry *lle) 2353{ 2354 LLE_WUNLOCK(lle); 2355 LLE_LOCK_DESTROY(lle); 2356 free(lle, M_LLTABLE); 2357} 2358 2359static void 2360in6_lltable_prefix_free(struct lltable *llt, 2361 const struct sockaddr *prefix, 2362 const struct sockaddr *mask) 2363{ 2364 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix; 2365 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask; 2366 struct llentry *lle, *next; 2367 register int i; 2368 2369 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) { 2370 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 2371 if (IN6_ARE_MASKED_ADDR_EQUAL( 2372 &((struct sockaddr_in6 *)L3_ADDR(lle))->sin6_addr, 2373 &pfx->sin6_addr, 2374 &msk->sin6_addr)) { 2375 callout_drain(&lle->la_timer); 2376 LLE_WLOCK(lle); 2377 llentry_free(lle); 2378 } 2379 } 2380 } 2381} 2382 2383static int 2384in6_lltable_rtcheck(struct ifnet *ifp, const struct sockaddr *l3addr) 2385{ 2386 struct rtentry *rt; 2387 char ip6buf[INET6_ADDRSTRLEN]; 2388 2389 KASSERT(l3addr->sa_family == AF_INET6, 2390 ("sin_family %d", l3addr->sa_family)); 2391 2392 /* XXX rtalloc1 should take a const param */ 2393 rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0); 2394 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 2395 struct ifaddr *ifa; 2396 /* 2397 * Create an ND6 cache for an IPv6 neighbor 2398 * that is not covered by our own prefix. 2399 */ 2400 /* XXX ifaof_ifpforaddr should take a const param */ 2401 ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp); 2402 if (ifa != NULL) { 2403 ifa_free(ifa); 2404 if (rt != NULL) 2405 RTFREE_LOCKED(rt); 2406 return 0; 2407 } 2408 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2409 ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr)); 2410 if (rt != NULL) 2411 RTFREE_LOCKED(rt); 2412 return EINVAL; 2413 } 2414 RTFREE_LOCKED(rt); 2415 return 0; 2416} 2417 2418static struct llentry * 2419in6_lltable_lookup(struct lltable *llt, u_int flags, 2420 const struct sockaddr *l3addr) 2421{ 2422 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2423 struct ifnet *ifp = llt->llt_ifp; 2424 struct llentry *lle; 2425 struct llentries *lleh; 2426 u_int hashkey; 2427 2428 IF_AFDATA_LOCK_ASSERT(ifp); 2429 KASSERT(l3addr->sa_family == AF_INET6, 2430 ("sin_family %d", l3addr->sa_family)); 2431 2432 hashkey = sin6->sin6_addr.s6_addr32[3]; 2433 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 2434 LIST_FOREACH(lle, lleh, lle_next) { 2435 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle); 2436 if (lle->la_flags & LLE_DELETED) 2437 continue; 2438 if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr, 2439 sizeof(struct in6_addr)) == 0) 2440 break; 2441 } 2442 2443 if (lle == NULL) { 2444 if (!(flags & LLE_CREATE)) 2445 return (NULL); 2446 /* 2447 * A route that covers the given address must have 2448 * been installed 1st because we are doing a resolution, 2449 * verify this. 2450 */ 2451 if (!(flags & LLE_IFADDR) && 2452 in6_lltable_rtcheck(ifp, l3addr) != 0) 2453 return NULL; 2454 2455 lle = in6_lltable_new(l3addr, flags); 2456 if (lle == NULL) { 2457 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2458 return NULL; 2459 } 2460 lle->la_flags = flags & ~LLE_CREATE; 2461 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 2462 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 2463 lle->la_flags |= (LLE_VALID | LLE_STATIC); 2464 } 2465 2466 lle->lle_tbl = llt; 2467 lle->lle_head = lleh; 2468 LIST_INSERT_HEAD(lleh, lle, lle_next); 2469 } else if (flags & LLE_DELETE) { 2470 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 2471 LLE_WLOCK(lle); 2472 lle->la_flags = LLE_DELETED; 2473 LLE_WUNLOCK(lle); 2474#ifdef DIAGNOSTICS 2475 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2476#endif 2477 } 2478 lle = (void *)-1; 2479 } 2480 if (LLE_IS_VALID(lle)) { 2481 if (flags & LLE_EXCLUSIVE) 2482 LLE_WLOCK(lle); 2483 else 2484 LLE_RLOCK(lle); 2485 } 2486 return (lle); 2487} 2488 2489static int 2490in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 2491{ 2492 struct ifnet *ifp = llt->llt_ifp; 2493 struct llentry *lle; 2494 /* XXX stack use */ 2495 struct { 2496 struct rt_msghdr rtm; 2497 struct sockaddr_in6 sin6; 2498 /* 2499 * ndp.c assumes that sdl is word aligned 2500 */ 2501#ifdef __LP64__ 2502 uint32_t pad; 2503#endif 2504 struct sockaddr_dl sdl; 2505 } ndpc; 2506 int i, error; 2507 2508 if (ifp->if_flags & IFF_LOOPBACK) 2509 return 0; 2510 2511 LLTABLE_LOCK_ASSERT(); 2512 2513 error = 0; 2514 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 2515 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 2516 struct sockaddr_dl *sdl; 2517 2518 /* skip deleted or invalid entries */ 2519 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID) 2520 continue; 2521 /* Skip if jailed and not a valid IP of the prison. */ 2522 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 2523 continue; 2524 /* 2525 * produce a msg made of: 2526 * struct rt_msghdr; 2527 * struct sockaddr_in6 (IPv6) 2528 * struct sockaddr_dl; 2529 */ 2530 bzero(&ndpc, sizeof(ndpc)); 2531 ndpc.rtm.rtm_msglen = sizeof(ndpc); 2532 ndpc.rtm.rtm_version = RTM_VERSION; 2533 ndpc.rtm.rtm_type = RTM_GET; 2534 ndpc.rtm.rtm_flags = RTF_UP; 2535 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 2536 ndpc.sin6.sin6_family = AF_INET6; 2537 ndpc.sin6.sin6_len = sizeof(ndpc.sin6); 2538 bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle)); 2539 2540 /* publish */ 2541 if (lle->la_flags & LLE_PUB) 2542 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE; 2543 2544 sdl = &ndpc.sdl; 2545 sdl->sdl_family = AF_LINK; 2546 sdl->sdl_len = sizeof(*sdl); 2547 sdl->sdl_alen = ifp->if_addrlen; 2548 sdl->sdl_index = ifp->if_index; 2549 sdl->sdl_type = ifp->if_type; 2550 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 2551 ndpc.rtm.rtm_rmx.rmx_expire = 2552 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 2553 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 2554 if (lle->la_flags & LLE_STATIC) 2555 ndpc.rtm.rtm_flags |= RTF_STATIC; 2556 ndpc.rtm.rtm_index = ifp->if_index; 2557 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc)); 2558 if (error) 2559 break; 2560 } 2561 } 2562 return error; 2563} 2564 2565void * 2566in6_domifattach(struct ifnet *ifp) 2567{ 2568 struct in6_ifextra *ext; 2569 2570 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2571 bzero(ext, sizeof(*ext)); 2572 2573 ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat), 2574 M_IFADDR, M_WAITOK); 2575 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat)); 2576 2577 ext->icmp6_ifstat = 2578 (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat), 2579 M_IFADDR, M_WAITOK); 2580 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat)); 2581 2582 ext->nd_ifinfo = nd6_ifattach(ifp); 2583 ext->scope6_id = scope6_ifattach(ifp); 2584 ext->lltable = lltable_init(ifp, AF_INET6); 2585 if (ext->lltable != NULL) { 2586 ext->lltable->llt_new = in6_lltable_new; 2587 ext->lltable->llt_free = in6_lltable_free; 2588 ext->lltable->llt_prefix_free = in6_lltable_prefix_free; 2589 ext->lltable->llt_rtcheck = in6_lltable_rtcheck; 2590 ext->lltable->llt_lookup = in6_lltable_lookup; 2591 ext->lltable->llt_dump = in6_lltable_dump; 2592 } 2593 2594 ext->mld_ifinfo = mld_domifattach(ifp); 2595 2596 return ext; 2597} 2598 2599void 2600in6_domifdetach(struct ifnet *ifp, void *aux) 2601{ 2602 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2603 2604 mld_domifdetach(ifp); 2605 scope6_ifdetach(ext->scope6_id); 2606 nd6_ifdetach(ext->nd_ifinfo); 2607 lltable_free(ext->lltable); 2608 free(ext->in6_ifstat, M_IFADDR); 2609 free(ext->icmp6_ifstat, M_IFADDR); 2610 free(ext, M_IFADDR); 2611} 2612 2613/* 2614 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2615 * v4 mapped addr or v4 compat addr 2616 */ 2617void 2618in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2619{ 2620 2621 bzero(sin, sizeof(*sin)); 2622 sin->sin_len = sizeof(struct sockaddr_in); 2623 sin->sin_family = AF_INET; 2624 sin->sin_port = sin6->sin6_port; 2625 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2626} 2627 2628/* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2629void 2630in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2631{ 2632 bzero(sin6, sizeof(*sin6)); 2633 sin6->sin6_len = sizeof(struct sockaddr_in6); 2634 sin6->sin6_family = AF_INET6; 2635 sin6->sin6_port = sin->sin_port; 2636 sin6->sin6_addr.s6_addr32[0] = 0; 2637 sin6->sin6_addr.s6_addr32[1] = 0; 2638 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2639 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2640} 2641 2642/* Convert sockaddr_in6 into sockaddr_in. */ 2643void 2644in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2645{ 2646 struct sockaddr_in *sin_p; 2647 struct sockaddr_in6 sin6; 2648 2649 /* 2650 * Save original sockaddr_in6 addr and convert it 2651 * to sockaddr_in. 2652 */ 2653 sin6 = *(struct sockaddr_in6 *)nam; 2654 sin_p = (struct sockaddr_in *)nam; 2655 in6_sin6_2_sin(sin_p, &sin6); 2656} 2657 2658/* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2659void 2660in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2661{ 2662 struct sockaddr_in *sin_p; 2663 struct sockaddr_in6 *sin6_p; 2664 2665 sin6_p = malloc(sizeof *sin6_p, M_SONAME, 2666 M_WAITOK); 2667 sin_p = (struct sockaddr_in *)*nam; 2668 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2669 free(*nam, M_SONAME); 2670 *nam = (struct sockaddr *)sin6_p; 2671} 2672