1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $ 32 */ 33 34 /*- 35 * Copyright (c) 1982, 1986, 1991, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * @(#)in.c 8.2 (Berkeley) 11/15/93 63 */ 64 65 #include <sys/cdefs.h> 66 __FBSDID("$FreeBSD$"); 67 68 #include "opt_compat.h" 69 #include "opt_inet.h" 70 #include "opt_inet6.h" 71 72 #include <sys/param.h> 73 #include <sys/eventhandler.h> 74 #include <sys/errno.h> 75 #include <sys/jail.h> 76 #include <sys/malloc.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/sockio.h> 80 #include <sys/systm.h> 81 #include <sys/priv.h> 82 #include <sys/proc.h> 83 #include <sys/time.h> 84 #include <sys/kernel.h> 85 #include <sys/lock.h> 86 #include <sys/rmlock.h> 87 #include <sys/syslog.h> 88 89 #include <net/if.h> 90 #include <net/if_var.h> 91 #include <net/if_types.h> 92 #include <net/route.h> 93 #include <net/if_dl.h> 94 #include <net/vnet.h> 95 96 #include <netinet/in.h> 97 #include <netinet/in_var.h> 98 #include <net/if_llatbl.h> 99 #include <netinet/if_ether.h> 100 #include <netinet/in_systm.h> 101 #include <netinet/ip.h> 102 #include <netinet/in_pcb.h> 103 #include <netinet/ip_carp.h> 104 105 #include <netinet/ip6.h> 106 #include <netinet6/ip6_var.h> 107 #include <netinet6/nd6.h> 108 #include <netinet6/mld6_var.h> 109 #include <netinet6/ip6_mroute.h> 110 #include <netinet6/in6_ifattach.h> 111 #include <netinet6/scope6_var.h> 112 #include <netinet6/in6_fib.h> 113 #include <netinet6/in6_pcb.h> 114 115 VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix); 116 #define V_icmp6_nodeinfo_oldmcprefix VNET(icmp6_nodeinfo_oldmcprefix) 117 118 /* 119 * Definitions of some costant IP6 addresses. 120 */ 121 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 122 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 123 const struct in6_addr in6addr_nodelocal_allnodes = 124 IN6ADDR_NODELOCAL_ALLNODES_INIT; 125 const struct in6_addr in6addr_linklocal_allnodes = 126 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 127 const struct in6_addr in6addr_linklocal_allrouters = 128 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 129 const struct in6_addr in6addr_linklocal_allv2routers = 130 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT; 131 132 const struct in6_addr in6mask0 = IN6MASK0; 133 const struct in6_addr in6mask32 = IN6MASK32; 134 const struct in6_addr in6mask64 = IN6MASK64; 135 const struct in6_addr in6mask96 = IN6MASK96; 136 const struct in6_addr in6mask128 = IN6MASK128; 137 138 const struct sockaddr_in6 sa6_any = 139 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 }; 140 141 static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *, 142 struct in6_aliasreq *, int); 143 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 144 145 static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *, 146 struct in6_ifaddr *, int); 147 static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *, 148 struct in6_aliasreq *, int flags); 149 static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *, 150 struct in6_ifaddr *, int, int); 151 static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *, 152 struct in6_ifaddr *, int); 153 154 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 155 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 156 157 158 void 159 in6_newaddrmsg(struct in6_ifaddr *ia, int cmd) 160 { 161 struct sockaddr_dl gateway; 162 struct sockaddr_in6 mask, addr; 163 struct rtentry rt; 164 int fibnum; 165 166 /* 167 * initialize for rtmsg generation 168 */ 169 bzero(&gateway, sizeof(gateway)); 170 gateway.sdl_len = sizeof(gateway); 171 gateway.sdl_family = AF_LINK; 172 173 bzero(&rt, sizeof(rt)); 174 rt.rt_gateway = (struct sockaddr *)&gateway; 175 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 176 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr)); 177 rt_mask(&rt) = (struct sockaddr *)&mask; 178 rt_key(&rt) = (struct sockaddr *)&addr; 179 rt.rt_flags = RTF_HOST | RTF_STATIC; 180 if (cmd == RTM_ADD) 181 rt.rt_flags |= RTF_UP; 182 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS : ia62ifa(ia)->ifa_ifp->if_fib; 183 /* Announce arrival of local address to this FIB. */ 184 rt_newaddrmsg_fib(cmd, &ia->ia_ifa, 0, &rt, fibnum); 185 } 186 187 int 188 in6_mask2len(struct in6_addr *mask, u_char *lim0) 189 { 190 int x = 0, y; 191 u_char *lim = lim0, *p; 192 193 /* ignore the scope_id part */ 194 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 195 lim = (u_char *)mask + sizeof(*mask); 196 for (p = (u_char *)mask; p < lim; x++, p++) { 197 if (*p != 0xff) 198 break; 199 } 200 y = 0; 201 if (p < lim) { 202 for (y = 0; y < 8; y++) { 203 if ((*p & (0x80 >> y)) == 0) 204 break; 205 } 206 } 207 208 /* 209 * when the limit pointer is given, do a stricter check on the 210 * remaining bits. 211 */ 212 if (p < lim) { 213 if (y != 0 && (*p & (0x00ff >> y)) != 0) 214 return (-1); 215 for (p = p + 1; p < lim; p++) 216 if (*p != 0) 217 return (-1); 218 } 219 220 return x * 8 + y; 221 } 222 223 #ifdef COMPAT_FREEBSD32 224 struct in6_ndifreq32 { 225 char ifname[IFNAMSIZ]; 226 uint32_t ifindex; 227 }; 228 #define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32) 229 #endif 230 231 int 232 in6_control(struct socket *so, u_long cmd, caddr_t data, 233 struct ifnet *ifp, struct thread *td) 234 { 235 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 236 struct in6_ifaddr *ia = NULL; 237 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 238 struct sockaddr_in6 *sa6; 239 int carp_attached = 0; 240 int error; 241 u_long ocmd = cmd; 242 243 /* 244 * Compat to make pre-10.x ifconfig(8) operable. 245 */ 246 if (cmd == OSIOCAIFADDR_IN6) 247 cmd = SIOCAIFADDR_IN6; 248 249 switch (cmd) { 250 case SIOCGETSGCNT_IN6: 251 case SIOCGETMIFCNT_IN6: 252 /* 253 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c. 254 * We cannot see how that would be needed, so do not adjust the 255 * KPI blindly; more likely should clean up the IPv4 variant. 256 */ 257 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP); 258 } 259 260 switch (cmd) { 261 case SIOCAADDRCTL_POLICY: 262 case SIOCDADDRCTL_POLICY: 263 if (td != NULL) { 264 error = priv_check(td, PRIV_NETINET_ADDRCTRL6); 265 if (error) 266 return (error); 267 } 268 return (in6_src_ioctl(cmd, data)); 269 } 270 271 if (ifp == NULL) 272 return (EOPNOTSUPP); 273 274 switch (cmd) { 275 case SIOCSNDFLUSH_IN6: 276 case SIOCSPFXFLUSH_IN6: 277 case SIOCSRTRFLUSH_IN6: 278 case SIOCSDEFIFACE_IN6: 279 case SIOCSIFINFO_FLAGS: 280 case SIOCSIFINFO_IN6: 281 if (td != NULL) { 282 error = priv_check(td, PRIV_NETINET_ND6); 283 if (error) 284 return (error); 285 } 286 /* FALLTHROUGH */ 287 case OSIOCGIFINFO_IN6: 288 case SIOCGIFINFO_IN6: 289 case SIOCGNBRINFO_IN6: 290 case SIOCGDEFIFACE_IN6: 291 return (nd6_ioctl(cmd, data, ifp)); 292 293 #ifdef COMPAT_FREEBSD32 294 case SIOCGDEFIFACE32_IN6: 295 { 296 struct in6_ndifreq ndif; 297 struct in6_ndifreq32 *ndif32; 298 299 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif, 300 ifp); 301 if (error) 302 return (error); 303 ndif32 = (struct in6_ndifreq32 *)data; 304 ndif32->ifindex = ndif.ifindex; 305 return (0); 306 } 307 #endif 308 } 309 310 switch (cmd) { 311 case SIOCSIFPREFIX_IN6: 312 case SIOCDIFPREFIX_IN6: 313 case SIOCAIFPREFIX_IN6: 314 case SIOCCIFPREFIX_IN6: 315 case SIOCSGIFPREFIX_IN6: 316 case SIOCGIFPREFIX_IN6: 317 log(LOG_NOTICE, 318 "prefix ioctls are now invalidated. " 319 "please use ifconfig.\n"); 320 return (EOPNOTSUPP); 321 } 322 323 switch (cmd) { 324 case SIOCSSCOPE6: 325 if (td != NULL) { 326 error = priv_check(td, PRIV_NETINET_SCOPE6); 327 if (error) 328 return (error); 329 } 330 /* FALLTHROUGH */ 331 case SIOCGSCOPE6: 332 case SIOCGSCOPE6DEF: 333 return (scope6_ioctl(cmd, data, ifp)); 334 } 335 336 /* 337 * Find address for this interface, if it exists. 338 * 339 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 340 * only, and used the first interface address as the target of other 341 * operations (without checking ifra_addr). This was because netinet 342 * code/API assumed at most 1 interface address per interface. 343 * Since IPv6 allows a node to assign multiple addresses 344 * on a single interface, we almost always look and check the 345 * presence of ifra_addr, and reject invalid ones here. 346 * It also decreases duplicated code among SIOC*_IN6 operations. 347 */ 348 switch (cmd) { 349 case SIOCAIFADDR_IN6: 350 case SIOCSIFPHYADDR_IN6: 351 sa6 = &ifra->ifra_addr; 352 break; 353 case SIOCSIFADDR_IN6: 354 case SIOCGIFADDR_IN6: 355 case SIOCSIFDSTADDR_IN6: 356 case SIOCSIFNETMASK_IN6: 357 case SIOCGIFDSTADDR_IN6: 358 case SIOCGIFNETMASK_IN6: 359 case SIOCDIFADDR_IN6: 360 case SIOCGIFPSRCADDR_IN6: 361 case SIOCGIFPDSTADDR_IN6: 362 case SIOCGIFAFLAG_IN6: 363 case SIOCSNDFLUSH_IN6: 364 case SIOCSPFXFLUSH_IN6: 365 case SIOCSRTRFLUSH_IN6: 366 case SIOCGIFALIFETIME_IN6: 367 case SIOCGIFSTAT_IN6: 368 case SIOCGIFSTAT_ICMP6: 369 sa6 = &ifr->ifr_addr; 370 break; 371 case SIOCSIFADDR: 372 case SIOCSIFBRDADDR: 373 case SIOCSIFDSTADDR: 374 case SIOCSIFNETMASK: 375 /* 376 * Although we should pass any non-INET6 ioctl requests 377 * down to driver, we filter some legacy INET requests. 378 * Drivers trust SIOCSIFADDR et al to come from an already 379 * privileged layer, and do not perform any credentials 380 * checks or input validation. 381 */ 382 return (EINVAL); 383 default: 384 sa6 = NULL; 385 break; 386 } 387 if (sa6 && sa6->sin6_family == AF_INET6) { 388 if (sa6->sin6_scope_id != 0) 389 error = sa6_embedscope(sa6, 0); 390 else 391 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 392 if (error != 0) 393 return (error); 394 if (td != NULL && (error = prison_check_ip6(td->td_ucred, 395 &sa6->sin6_addr)) != 0) 396 return (error); 397 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 398 } else 399 ia = NULL; 400 401 switch (cmd) { 402 case SIOCSIFADDR_IN6: 403 case SIOCSIFDSTADDR_IN6: 404 case SIOCSIFNETMASK_IN6: 405 /* 406 * Since IPv6 allows a node to assign multiple addresses 407 * on a single interface, SIOCSIFxxx ioctls are deprecated. 408 */ 409 /* we decided to obsolete this command (20000704) */ 410 error = EINVAL; 411 goto out; 412 413 case SIOCDIFADDR_IN6: 414 /* 415 * for IPv4, we look for existing in_ifaddr here to allow 416 * "ifconfig if0 delete" to remove the first IPv4 address on 417 * the interface. For IPv6, as the spec allows multiple 418 * interface address from the day one, we consider "remove the 419 * first one" semantics to be not preferable. 420 */ 421 if (ia == NULL) { 422 error = EADDRNOTAVAIL; 423 goto out; 424 } 425 /* FALLTHROUGH */ 426 case SIOCAIFADDR_IN6: 427 /* 428 * We always require users to specify a valid IPv6 address for 429 * the corresponding operation. 430 */ 431 if (ifra->ifra_addr.sin6_family != AF_INET6 || 432 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 433 error = EAFNOSUPPORT; 434 goto out; 435 } 436 437 if (td != NULL) { 438 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 439 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR); 440 if (error) 441 goto out; 442 } 443 /* FALLTHROUGH */ 444 case SIOCGIFSTAT_IN6: 445 case SIOCGIFSTAT_ICMP6: 446 if (ifp->if_afdata[AF_INET6] == NULL) { 447 error = EPFNOSUPPORT; 448 goto out; 449 } 450 break; 451 452 case SIOCGIFADDR_IN6: 453 /* This interface is basically deprecated. use SIOCGIFCONF. */ 454 /* FALLTHROUGH */ 455 case SIOCGIFAFLAG_IN6: 456 case SIOCGIFNETMASK_IN6: 457 case SIOCGIFDSTADDR_IN6: 458 case SIOCGIFALIFETIME_IN6: 459 /* must think again about its semantics */ 460 if (ia == NULL) { 461 error = EADDRNOTAVAIL; 462 goto out; 463 } 464 break; 465 } 466 467 switch (cmd) { 468 case SIOCGIFADDR_IN6: 469 ifr->ifr_addr = ia->ia_addr; 470 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 471 goto out; 472 break; 473 474 case SIOCGIFDSTADDR_IN6: 475 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 476 error = EINVAL; 477 goto out; 478 } 479 /* 480 * XXX: should we check if ifa_dstaddr is NULL and return 481 * an error? 482 */ 483 ifr->ifr_dstaddr = ia->ia_dstaddr; 484 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 485 goto out; 486 break; 487 488 case SIOCGIFNETMASK_IN6: 489 ifr->ifr_addr = ia->ia_prefixmask; 490 break; 491 492 case SIOCGIFAFLAG_IN6: 493 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 494 break; 495 496 case SIOCGIFSTAT_IN6: 497 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 498 ifp->if_afdata[AF_INET6])->in6_ifstat, 499 &ifr->ifr_ifru.ifru_stat, 500 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 501 break; 502 503 case SIOCGIFSTAT_ICMP6: 504 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 505 ifp->if_afdata[AF_INET6])->icmp6_ifstat, 506 &ifr->ifr_ifru.ifru_icmp6stat, 507 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 508 break; 509 510 case SIOCGIFALIFETIME_IN6: 511 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 512 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 513 time_t maxexpire; 514 struct in6_addrlifetime *retlt = 515 &ifr->ifr_ifru.ifru_lifetime; 516 517 /* 518 * XXX: adjust expiration time assuming time_t is 519 * signed. 520 */ 521 maxexpire = (-1) & 522 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 523 if (ia->ia6_lifetime.ia6t_vltime < 524 maxexpire - ia->ia6_updatetime) { 525 retlt->ia6t_expire = ia->ia6_updatetime + 526 ia->ia6_lifetime.ia6t_vltime; 527 } else 528 retlt->ia6t_expire = maxexpire; 529 } 530 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 531 time_t maxexpire; 532 struct in6_addrlifetime *retlt = 533 &ifr->ifr_ifru.ifru_lifetime; 534 535 /* 536 * XXX: adjust expiration time assuming time_t is 537 * signed. 538 */ 539 maxexpire = (-1) & 540 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 541 if (ia->ia6_lifetime.ia6t_pltime < 542 maxexpire - ia->ia6_updatetime) { 543 retlt->ia6t_preferred = ia->ia6_updatetime + 544 ia->ia6_lifetime.ia6t_pltime; 545 } else 546 retlt->ia6t_preferred = maxexpire; 547 } 548 break; 549 550 case SIOCAIFADDR_IN6: 551 { 552 struct nd_prefixctl pr0; 553 struct nd_prefix *pr; 554 555 /* 556 * first, make or update the interface address structure, 557 * and link it to the list. 558 */ 559 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 560 goto out; 561 if (ia != NULL) { 562 if (ia->ia_ifa.ifa_carp) 563 (*carp_detach_p)(&ia->ia_ifa, true); 564 ifa_free(&ia->ia_ifa); 565 } 566 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 567 == NULL) { 568 /* 569 * this can happen when the user specify the 0 valid 570 * lifetime. 571 */ 572 break; 573 } 574 575 if (cmd == ocmd && ifra->ifra_vhid > 0) { 576 if (carp_attach_p != NULL) 577 error = (*carp_attach_p)(&ia->ia_ifa, 578 ifra->ifra_vhid); 579 else 580 error = EPROTONOSUPPORT; 581 if (error) 582 goto out; 583 else 584 carp_attached = 1; 585 } 586 587 /* 588 * then, make the prefix on-link on the interface. 589 * XXX: we'd rather create the prefix before the address, but 590 * we need at least one address to install the corresponding 591 * interface route, so we configure the address first. 592 */ 593 594 /* 595 * convert mask to prefix length (prefixmask has already 596 * been validated in in6_update_ifa(). 597 */ 598 bzero(&pr0, sizeof(pr0)); 599 pr0.ndpr_ifp = ifp; 600 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 601 NULL); 602 if (pr0.ndpr_plen == 128) { 603 /* we don't need to install a host route. */ 604 goto aifaddr_out; 605 } 606 pr0.ndpr_prefix = ifra->ifra_addr; 607 /* apply the mask for safety. */ 608 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, 609 &ifra->ifra_prefixmask.sin6_addr); 610 611 /* 612 * XXX: since we don't have an API to set prefix (not address) 613 * lifetimes, we just use the same lifetimes as addresses. 614 * The (temporarily) installed lifetimes can be overridden by 615 * later advertised RAs (when accept_rtadv is non 0), which is 616 * an intended behavior. 617 */ 618 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 619 pr0.ndpr_raf_auto = 620 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 621 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 622 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 623 624 /* add the prefix if not yet. */ 625 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 626 /* 627 * nd6_prelist_add will install the corresponding 628 * interface route. 629 */ 630 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) { 631 if (carp_attached) 632 (*carp_detach_p)(&ia->ia_ifa, false); 633 goto out; 634 } 635 } 636 637 /* relate the address to the prefix */ 638 if (ia->ia6_ndpr == NULL) { 639 ia->ia6_ndpr = pr; 640 pr->ndpr_addrcnt++; 641 642 /* 643 * If this is the first autoconf address from the 644 * prefix, create a temporary address as well 645 * (when required). 646 */ 647 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 648 V_ip6_use_tempaddr && pr->ndpr_addrcnt == 1) { 649 int e; 650 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 651 log(LOG_NOTICE, "in6_control: failed " 652 "to create a temporary address, " 653 "errno=%d\n", e); 654 } 655 } 656 } 657 nd6_prefix_rele(pr); 658 659 /* 660 * this might affect the status of autoconfigured addresses, 661 * that is, this address might make other addresses detached. 662 */ 663 pfxlist_onlink_check(); 664 665 aifaddr_out: 666 /* 667 * Try to clear the flag when a new IPv6 address is added 668 * onto an IFDISABLED interface and it succeeds. 669 */ 670 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) { 671 struct in6_ndireq nd; 672 673 memset(&nd, 0, sizeof(nd)); 674 nd.ndi.flags = ND_IFINFO(ifp)->flags; 675 nd.ndi.flags &= ~ND6_IFF_IFDISABLED; 676 if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0) 677 log(LOG_NOTICE, "SIOCAIFADDR_IN6: " 678 "SIOCSIFINFO_FLAGS for -ifdisabled " 679 "failed."); 680 /* 681 * Ignore failure of clearing the flag intentionally. 682 * The failure means address duplication was detected. 683 */ 684 } 685 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 686 break; 687 } 688 689 case SIOCDIFADDR_IN6: 690 { 691 struct nd_prefix *pr; 692 693 /* 694 * If the address being deleted is the only one that owns 695 * the corresponding prefix, expire the prefix as well. 696 * XXX: theoretically, we don't have to worry about such 697 * relationship, since we separate the address management 698 * and the prefix management. We do this, however, to provide 699 * as much backward compatibility as possible in terms of 700 * the ioctl operation. 701 * Note that in6_purgeaddr() will decrement ndpr_addrcnt. 702 */ 703 pr = ia->ia6_ndpr; 704 in6_purgeaddr(&ia->ia_ifa); 705 if (pr != NULL && pr->ndpr_addrcnt == 0) { 706 ND6_WLOCK(); 707 nd6_prefix_unlink(pr, NULL); 708 ND6_WUNLOCK(); 709 nd6_prefix_del(pr); 710 } 711 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 712 break; 713 } 714 715 default: 716 if (ifp->if_ioctl == NULL) { 717 error = EOPNOTSUPP; 718 goto out; 719 } 720 error = (*ifp->if_ioctl)(ifp, cmd, data); 721 goto out; 722 } 723 724 error = 0; 725 out: 726 if (ia != NULL) 727 ifa_free(&ia->ia_ifa); 728 return (error); 729 } 730 731 732 /* 733 * Join necessary multicast groups. Factored out from in6_update_ifa(). 734 * This entire work should only be done once, for the default FIB. 735 */ 736 static int 737 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra, 738 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol) 739 { 740 char ip6buf[INET6_ADDRSTRLEN]; 741 struct in6_addr mltaddr; 742 struct in6_multi_mship *imm; 743 int delay, error; 744 745 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__)); 746 747 /* Join solicited multicast addr for new host id. */ 748 bzero(&mltaddr, sizeof(struct in6_addr)); 749 mltaddr.s6_addr32[0] = IPV6_ADDR_INT32_MLL; 750 mltaddr.s6_addr32[2] = htonl(1); 751 mltaddr.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 752 mltaddr.s6_addr8[12] = 0xff; 753 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) { 754 /* XXX: should not happen */ 755 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 756 goto cleanup; 757 } 758 delay = error = 0; 759 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 760 /* 761 * We need a random delay for DAD on the address being 762 * configured. It also means delaying transmission of the 763 * corresponding MLD report to avoid report collision. 764 * [RFC 4861, Section 6.3.7] 765 */ 766 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 767 } 768 imm = in6_joingroup(ifp, &mltaddr, &error, delay); 769 if (imm == NULL) { 770 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 771 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 772 if_name(ifp), error)); 773 goto cleanup; 774 } 775 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 776 *in6m_sol = imm->i6mm_maddr; 777 778 /* 779 * Join link-local all-nodes address. 780 */ 781 mltaddr = in6addr_linklocal_allnodes; 782 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 783 goto cleanup; /* XXX: should not fail */ 784 785 imm = in6_joingroup(ifp, &mltaddr, &error, 0); 786 if (imm == NULL) { 787 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 788 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 789 if_name(ifp), error)); 790 goto cleanup; 791 } 792 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 793 794 /* 795 * Join node information group address. 796 */ 797 delay = 0; 798 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 799 /* 800 * The spec does not say anything about delay for this group, 801 * but the same logic should apply. 802 */ 803 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 804 } 805 if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) { 806 /* XXX jinmei */ 807 imm = in6_joingroup(ifp, &mltaddr, &error, delay); 808 if (imm == NULL) 809 nd6log((LOG_WARNING, 810 "%s: in6_joingroup failed for %s on %s " 811 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 812 &mltaddr), if_name(ifp), error)); 813 /* XXX not very fatal, go on... */ 814 else 815 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 816 } 817 if (V_icmp6_nodeinfo_oldmcprefix && 818 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) { 819 imm = in6_joingroup(ifp, &mltaddr, &error, delay); 820 if (imm == NULL) 821 nd6log((LOG_WARNING, 822 "%s: in6_joingroup failed for %s on %s " 823 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 824 &mltaddr), if_name(ifp), error)); 825 /* XXX not very fatal, go on... */ 826 else 827 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 828 } 829 830 /* 831 * Join interface-local all-nodes address. 832 * (ff01::1%ifN, and ff01::%ifN/32) 833 */ 834 mltaddr = in6addr_nodelocal_allnodes; 835 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 836 goto cleanup; /* XXX: should not fail */ 837 838 imm = in6_joingroup(ifp, &mltaddr, &error, 0); 839 if (imm == NULL) { 840 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 841 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 842 &mltaddr), if_name(ifp), error)); 843 goto cleanup; 844 } 845 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 846 847 cleanup: 848 return (error); 849 } 850 851 /* 852 * Update parameters of an IPv6 interface address. 853 * If necessary, a new entry is created and linked into address chains. 854 * This function is separated from in6_control(). 855 */ 856 int 857 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 858 struct in6_ifaddr *ia, int flags) 859 { 860 int error, hostIsNew = 0; 861 862 if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0) 863 return (error); 864 865 if (ia == NULL) { 866 hostIsNew = 1; 867 if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL) 868 return (ENOBUFS); 869 } 870 871 error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags); 872 if (error != 0) { 873 if (hostIsNew != 0) { 874 in6_unlink_ifa(ia, ifp); 875 ifa_free(&ia->ia_ifa); 876 } 877 return (error); 878 } 879 880 if (hostIsNew) 881 error = in6_broadcast_ifa(ifp, ifra, ia, flags); 882 883 return (error); 884 } 885 886 /* 887 * Fill in basic IPv6 address request info. 888 */ 889 void 890 in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr, 891 const struct in6_addr *mask) 892 { 893 894 memset(ifra, 0, sizeof(struct in6_aliasreq)); 895 896 ifra->ifra_addr.sin6_family = AF_INET6; 897 ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 898 if (addr != NULL) 899 ifra->ifra_addr.sin6_addr = *addr; 900 901 ifra->ifra_prefixmask.sin6_family = AF_INET6; 902 ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 903 if (mask != NULL) 904 ifra->ifra_prefixmask.sin6_addr = *mask; 905 } 906 907 static int 908 in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra, 909 struct in6_ifaddr *ia, int flags) 910 { 911 int plen = -1; 912 struct sockaddr_in6 dst6; 913 struct in6_addrlifetime *lt; 914 char ip6buf[INET6_ADDRSTRLEN]; 915 916 /* Validate parameters */ 917 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 918 return (EINVAL); 919 920 /* 921 * The destination address for a p2p link must have a family 922 * of AF_UNSPEC or AF_INET6. 923 */ 924 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 925 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 926 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 927 return (EAFNOSUPPORT); 928 929 /* 930 * Validate address 931 */ 932 if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) || 933 ifra->ifra_addr.sin6_family != AF_INET6) 934 return (EINVAL); 935 936 /* 937 * validate ifra_prefixmask. don't check sin6_family, netmask 938 * does not carry fields other than sin6_len. 939 */ 940 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 941 return (EINVAL); 942 /* 943 * Because the IPv6 address architecture is classless, we require 944 * users to specify a (non 0) prefix length (mask) for a new address. 945 * We also require the prefix (when specified) mask is valid, and thus 946 * reject a non-consecutive mask. 947 */ 948 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 949 return (EINVAL); 950 if (ifra->ifra_prefixmask.sin6_len != 0) { 951 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 952 (u_char *)&ifra->ifra_prefixmask + 953 ifra->ifra_prefixmask.sin6_len); 954 if (plen <= 0) 955 return (EINVAL); 956 } else { 957 /* 958 * In this case, ia must not be NULL. We just use its prefix 959 * length. 960 */ 961 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 962 } 963 /* 964 * If the destination address on a p2p interface is specified, 965 * and the address is a scoped one, validate/set the scope 966 * zone identifier. 967 */ 968 dst6 = ifra->ifra_dstaddr; 969 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 970 (dst6.sin6_family == AF_INET6)) { 971 struct in6_addr in6_tmp; 972 u_int32_t zoneid; 973 974 in6_tmp = dst6.sin6_addr; 975 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 976 return (EINVAL); /* XXX: should be impossible */ 977 978 if (dst6.sin6_scope_id != 0) { 979 if (dst6.sin6_scope_id != zoneid) 980 return (EINVAL); 981 } else /* user omit to specify the ID. */ 982 dst6.sin6_scope_id = zoneid; 983 984 /* convert into the internal form */ 985 if (sa6_embedscope(&dst6, 0)) 986 return (EINVAL); /* XXX: should be impossible */ 987 } 988 /* Modify original ifra_dstaddr to reflect changes */ 989 ifra->ifra_dstaddr = dst6; 990 991 /* 992 * The destination address can be specified only for a p2p or a 993 * loopback interface. If specified, the corresponding prefix length 994 * must be 128. 995 */ 996 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 997 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 998 /* XXX: noisy message */ 999 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 1000 "be specified for a p2p or a loopback IF only\n")); 1001 return (EINVAL); 1002 } 1003 if (plen != 128) { 1004 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 1005 "be 128 when dstaddr is specified\n")); 1006 return (EINVAL); 1007 } 1008 } 1009 /* lifetime consistency check */ 1010 lt = &ifra->ifra_lifetime; 1011 if (lt->ia6t_pltime > lt->ia6t_vltime) 1012 return (EINVAL); 1013 if (lt->ia6t_vltime == 0) { 1014 /* 1015 * the following log might be noisy, but this is a typical 1016 * configuration mistake or a tool's bug. 1017 */ 1018 nd6log((LOG_INFO, 1019 "in6_update_ifa: valid lifetime is 0 for %s\n", 1020 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr))); 1021 1022 if (ia == NULL) 1023 return (0); /* there's nothing to do */ 1024 } 1025 1026 /* Check prefix mask */ 1027 if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) { 1028 /* 1029 * We prohibit changing the prefix length of an existing 1030 * address, because 1031 * + such an operation should be rare in IPv6, and 1032 * + the operation would confuse prefix management. 1033 */ 1034 if (ia->ia_prefixmask.sin6_len != 0 && 1035 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 1036 nd6log((LOG_INFO, "in6_validate_ifa: the prefix length " 1037 "of an existing %s address should not be changed\n", 1038 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1039 1040 return (EINVAL); 1041 } 1042 } 1043 1044 return (0); 1045 } 1046 1047 1048 /* 1049 * Allocate a new ifaddr and link it into chains. 1050 */ 1051 static struct in6_ifaddr * 1052 in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags) 1053 { 1054 struct in6_ifaddr *ia; 1055 1056 /* 1057 * When in6_alloc_ifa() is called in a process of a received 1058 * RA, it is called under an interrupt context. So, we should 1059 * call malloc with M_NOWAIT. 1060 */ 1061 ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT); 1062 if (ia == NULL) 1063 return (NULL); 1064 LIST_INIT(&ia->ia6_memberships); 1065 /* Initialize the address and masks, and put time stamp */ 1066 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1067 ia->ia_addr.sin6_family = AF_INET6; 1068 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 1069 /* XXX: Can we assign ,sin6_addr and skip the rest? */ 1070 ia->ia_addr = ifra->ifra_addr; 1071 ia->ia6_createtime = time_uptime; 1072 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1073 /* 1074 * Some functions expect that ifa_dstaddr is not 1075 * NULL for p2p interfaces. 1076 */ 1077 ia->ia_ifa.ifa_dstaddr = 1078 (struct sockaddr *)&ia->ia_dstaddr; 1079 } else { 1080 ia->ia_ifa.ifa_dstaddr = NULL; 1081 } 1082 1083 /* set prefix mask if any */ 1084 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 1085 if (ifra->ifra_prefixmask.sin6_len != 0) { 1086 ia->ia_prefixmask.sin6_family = AF_INET6; 1087 ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len; 1088 ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr; 1089 } 1090 1091 ia->ia_ifp = ifp; 1092 ifa_ref(&ia->ia_ifa); /* if_addrhead */ 1093 IF_ADDR_WLOCK(ifp); 1094 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1095 IF_ADDR_WUNLOCK(ifp); 1096 1097 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */ 1098 IN6_IFADDR_WLOCK(); 1099 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link); 1100 LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash); 1101 IN6_IFADDR_WUNLOCK(); 1102 1103 return (ia); 1104 } 1105 1106 /* 1107 * Update/configure interface address parameters: 1108 * 1109 * 1) Update lifetime 1110 * 2) Update interface metric ad flags 1111 * 3) Notify other subsystems 1112 */ 1113 static int 1114 in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra, 1115 struct in6_ifaddr *ia, int hostIsNew, int flags) 1116 { 1117 int error; 1118 1119 /* update timestamp */ 1120 ia->ia6_updatetime = time_uptime; 1121 1122 /* 1123 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1124 * to see if the address is deprecated or invalidated, but initialize 1125 * these members for applications. 1126 */ 1127 ia->ia6_lifetime = ifra->ifra_lifetime; 1128 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1129 ia->ia6_lifetime.ia6t_expire = 1130 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1131 } else 1132 ia->ia6_lifetime.ia6t_expire = 0; 1133 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1134 ia->ia6_lifetime.ia6t_preferred = 1135 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1136 } else 1137 ia->ia6_lifetime.ia6t_preferred = 0; 1138 1139 /* 1140 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1141 * userland, make it deprecated. 1142 */ 1143 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1144 ia->ia6_lifetime.ia6t_pltime = 0; 1145 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1146 } 1147 1148 /* 1149 * configure address flags. 1150 */ 1151 ia->ia6_flags = ifra->ifra_flags; 1152 1153 /* 1154 * Make the address tentative before joining multicast addresses, 1155 * so that corresponding MLD responses would not have a tentative 1156 * source address. 1157 */ 1158 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1159 1160 /* 1161 * DAD should be performed for an new address or addresses on 1162 * an interface with ND6_IFF_IFDISABLED. 1163 */ 1164 if (in6if_do_dad(ifp) && 1165 (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED))) 1166 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1167 1168 /* notify other subsystems */ 1169 error = in6_notify_ifa(ifp, ia, ifra, hostIsNew); 1170 1171 return (error); 1172 } 1173 1174 /* 1175 * Do link-level ifa job: 1176 * 1) Add lle entry for added address 1177 * 2) Notifies routing socket users about new address 1178 * 3) join appropriate multicast group 1179 * 4) start DAD if enabled 1180 */ 1181 static int 1182 in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1183 struct in6_ifaddr *ia, int flags) 1184 { 1185 struct in6_multi *in6m_sol; 1186 int error = 0; 1187 1188 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1189 if ((error = nd6_add_ifa_lle(ia)) != 0) { 1190 in6_purgeaddr(&ia->ia_ifa); 1191 ifa_free(&ia->ia_ifa); 1192 return (error); 1193 } 1194 1195 /* Join necessary multicast groups. */ 1196 in6m_sol = NULL; 1197 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1198 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol); 1199 if (error != 0) { 1200 in6_purgeaddr(&ia->ia_ifa); 1201 ifa_free(&ia->ia_ifa); 1202 return (error); 1203 } 1204 } 1205 1206 /* Perform DAD, if the address is TENTATIVE. */ 1207 if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) { 1208 int delay, mindelay, maxdelay; 1209 1210 delay = 0; 1211 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1212 /* 1213 * We need to impose a delay before sending an NS 1214 * for DAD. Check if we also needed a delay for the 1215 * corresponding MLD message. If we did, the delay 1216 * should be larger than the MLD delay (this could be 1217 * relaxed a bit, but this simple logic is at least 1218 * safe). 1219 * XXX: Break data hiding guidelines and look at 1220 * state for the solicited multicast group. 1221 */ 1222 mindelay = 0; 1223 if (in6m_sol != NULL && 1224 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) { 1225 mindelay = in6m_sol->in6m_timer; 1226 } 1227 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1228 if (maxdelay - mindelay == 0) 1229 delay = 0; 1230 else { 1231 delay = 1232 (arc4random() % (maxdelay - mindelay)) + 1233 mindelay; 1234 } 1235 } 1236 nd6_dad_start((struct ifaddr *)ia, delay); 1237 } 1238 1239 in6_newaddrmsg(ia, RTM_ADD); 1240 ifa_free(&ia->ia_ifa); 1241 return (error); 1242 } 1243 1244 void 1245 in6_purgeaddr(struct ifaddr *ifa) 1246 { 1247 struct ifnet *ifp = ifa->ifa_ifp; 1248 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1249 struct in6_multi_mship *imm; 1250 int plen, error; 1251 1252 if (ifa->ifa_carp) 1253 (*carp_detach_p)(ifa, false); 1254 1255 /* 1256 * Remove the loopback route to the interface address. 1257 * The check for the current setting of "nd6_useloopback" 1258 * is not needed. 1259 */ 1260 if (ia->ia_flags & IFA_RTSELF) { 1261 error = ifa_del_loopback_route((struct ifaddr *)ia, 1262 (struct sockaddr *)&ia->ia_addr); 1263 if (error == 0) 1264 ia->ia_flags &= ~IFA_RTSELF; 1265 } 1266 1267 /* stop DAD processing */ 1268 nd6_dad_stop(ifa); 1269 1270 /* Leave multicast groups. */ 1271 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1272 LIST_REMOVE(imm, i6mm_chain); 1273 in6_leavegroup(imm); 1274 } 1275 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1276 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) { 1277 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags | 1278 (ia->ia_dstaddr.sin6_family == AF_INET6 ? RTF_HOST : 0)); 1279 if (error != 0) 1280 log(LOG_INFO, "%s: err=%d, destination address delete " 1281 "failed\n", __func__, error); 1282 ia->ia_flags &= ~IFA_ROUTE; 1283 } 1284 1285 in6_newaddrmsg(ia, RTM_DELETE); 1286 in6_unlink_ifa(ia, ifp); 1287 } 1288 1289 static void 1290 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1291 { 1292 char ip6buf[INET6_ADDRSTRLEN]; 1293 int remove_lle; 1294 1295 IF_ADDR_WLOCK(ifp); 1296 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1297 IF_ADDR_WUNLOCK(ifp); 1298 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1299 1300 /* 1301 * Defer the release of what might be the last reference to the 1302 * in6_ifaddr so that it can't be freed before the remainder of the 1303 * cleanup. 1304 */ 1305 IN6_IFADDR_WLOCK(); 1306 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 1307 LIST_REMOVE(ia, ia6_hash); 1308 IN6_IFADDR_WUNLOCK(); 1309 1310 /* 1311 * Release the reference to the base prefix. There should be a 1312 * positive reference. 1313 */ 1314 remove_lle = 0; 1315 if (ia->ia6_ndpr == NULL) { 1316 nd6log((LOG_NOTICE, 1317 "in6_unlink_ifa: autoconf'ed address " 1318 "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia)))); 1319 } else { 1320 ia->ia6_ndpr->ndpr_addrcnt--; 1321 /* Do not delete lles within prefix if refcont != 0 */ 1322 if (ia->ia6_ndpr->ndpr_addrcnt == 0) 1323 remove_lle = 1; 1324 ia->ia6_ndpr = NULL; 1325 } 1326 1327 nd6_rem_ifa_lle(ia, remove_lle); 1328 1329 /* 1330 * Also, if the address being removed is autoconf'ed, call 1331 * pfxlist_onlink_check() since the release might affect the status of 1332 * other (detached) addresses. 1333 */ 1334 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1335 pfxlist_onlink_check(); 1336 } 1337 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1338 } 1339 1340 /* 1341 * Notifies other subsystems about address change/arrival: 1342 * 1) Notifies device handler on the first IPv6 address assignment 1343 * 2) Handle routing table changes for P2P links and route 1344 * 3) Handle routing table changes for address host route 1345 */ 1346 static int 1347 in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia, 1348 struct in6_aliasreq *ifra, int hostIsNew) 1349 { 1350 int error = 0, plen, ifacount = 0; 1351 struct ifaddr *ifa; 1352 struct sockaddr_in6 *pdst; 1353 char ip6buf[INET6_ADDRSTRLEN]; 1354 1355 /* 1356 * Give the interface a chance to initialize 1357 * if this is its first address, 1358 */ 1359 if (hostIsNew != 0) { 1360 IF_ADDR_RLOCK(ifp); 1361 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1362 if (ifa->ifa_addr->sa_family != AF_INET6) 1363 continue; 1364 ifacount++; 1365 } 1366 IF_ADDR_RUNLOCK(ifp); 1367 } 1368 1369 if (ifacount <= 1 && ifp->if_ioctl) { 1370 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1371 if (error) 1372 return (error); 1373 } 1374 1375 /* 1376 * If a new destination address is specified, scrub the old one and 1377 * install the new destination. Note that the interface must be 1378 * p2p or loopback. 1379 */ 1380 pdst = &ifra->ifra_dstaddr; 1381 if (pdst->sin6_family == AF_INET6 && 1382 !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1383 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1384 (rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0)) { 1385 nd6log((LOG_ERR, "in6_update_ifa_internal: failed to " 1386 "remove a route to the old destination: %s\n", 1387 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1388 /* proceed anyway... */ 1389 } else 1390 ia->ia_flags &= ~IFA_ROUTE; 1391 ia->ia_dstaddr = *pdst; 1392 } 1393 1394 /* 1395 * If a new destination address is specified for a point-to-point 1396 * interface, install a route to the destination as an interface 1397 * direct route. 1398 * XXX: the logic below rejects assigning multiple addresses on a p2p 1399 * interface that share the same destination. 1400 */ 1401 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1402 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 && 1403 ia->ia_dstaddr.sin6_family == AF_INET6) { 1404 int rtflags = RTF_UP | RTF_HOST; 1405 /* 1406 * Handle the case for ::1 . 1407 */ 1408 if (ifp->if_flags & IFF_LOOPBACK) 1409 ia->ia_flags |= IFA_RTSELF; 1410 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags); 1411 if (error) 1412 return (error); 1413 ia->ia_flags |= IFA_ROUTE; 1414 } 1415 1416 /* 1417 * add a loopback route to self if not exists 1418 */ 1419 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) { 1420 error = ifa_add_loopback_route((struct ifaddr *)ia, 1421 (struct sockaddr *)&ia->ia_addr); 1422 if (error == 0) 1423 ia->ia_flags |= IFA_RTSELF; 1424 } 1425 1426 return (error); 1427 } 1428 1429 /* 1430 * Find an IPv6 interface link-local address specific to an interface. 1431 * ifaddr is returned referenced. 1432 */ 1433 struct in6_ifaddr * 1434 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1435 { 1436 struct ifaddr *ifa; 1437 1438 IF_ADDR_RLOCK(ifp); 1439 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1440 if (ifa->ifa_addr->sa_family != AF_INET6) 1441 continue; 1442 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1443 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1444 ignoreflags) != 0) 1445 continue; 1446 ifa_ref(ifa); 1447 break; 1448 } 1449 } 1450 IF_ADDR_RUNLOCK(ifp); 1451 1452 return ((struct in6_ifaddr *)ifa); 1453 } 1454 1455 1456 /* 1457 * find the internet address corresponding to a given address. 1458 * ifaddr is returned referenced. 1459 */ 1460 struct in6_ifaddr * 1461 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid) 1462 { 1463 struct rm_priotracker in6_ifa_tracker; 1464 struct in6_ifaddr *ia; 1465 1466 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1467 LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) { 1468 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1469 if (zoneid != 0 && 1470 zoneid != ia->ia_addr.sin6_scope_id) 1471 continue; 1472 ifa_ref(&ia->ia_ifa); 1473 break; 1474 } 1475 } 1476 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1477 return (ia); 1478 } 1479 1480 /* 1481 * find the internet address corresponding to a given interface and address. 1482 * ifaddr is returned referenced. 1483 */ 1484 struct in6_ifaddr * 1485 in6ifa_ifpwithaddr(struct ifnet *ifp, const struct in6_addr *addr) 1486 { 1487 struct ifaddr *ifa; 1488 1489 IF_ADDR_RLOCK(ifp); 1490 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1491 if (ifa->ifa_addr->sa_family != AF_INET6) 1492 continue; 1493 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1494 ifa_ref(ifa); 1495 break; 1496 } 1497 } 1498 IF_ADDR_RUNLOCK(ifp); 1499 1500 return ((struct in6_ifaddr *)ifa); 1501 } 1502 1503 /* 1504 * Find a link-local scoped address on ifp and return it if any. 1505 */ 1506 struct in6_ifaddr * 1507 in6ifa_llaonifp(struct ifnet *ifp) 1508 { 1509 struct sockaddr_in6 *sin6; 1510 struct ifaddr *ifa; 1511 1512 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1513 return (NULL); 1514 IF_ADDR_RLOCK(ifp); 1515 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1516 if (ifa->ifa_addr->sa_family != AF_INET6) 1517 continue; 1518 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 1519 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 1520 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) || 1521 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr)) 1522 break; 1523 } 1524 IF_ADDR_RUNLOCK(ifp); 1525 1526 return ((struct in6_ifaddr *)ifa); 1527 } 1528 1529 /* 1530 * Convert IP6 address to printable (loggable) representation. Caller 1531 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 1532 */ 1533 static char digits[] = "0123456789abcdef"; 1534 char * 1535 ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 1536 { 1537 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0; 1538 char *cp; 1539 const u_int16_t *a = (const u_int16_t *)addr; 1540 const u_int8_t *d; 1541 int dcolon = 0, zero = 0; 1542 1543 cp = ip6buf; 1544 1545 for (i = 0; i < 8; i++) { 1546 if (*(a + i) == 0) { 1547 cnt++; 1548 if (cnt == 1) 1549 idx = i; 1550 } 1551 else if (maxcnt < cnt) { 1552 maxcnt = cnt; 1553 index = idx; 1554 cnt = 0; 1555 } 1556 } 1557 if (maxcnt < cnt) { 1558 maxcnt = cnt; 1559 index = idx; 1560 } 1561 1562 for (i = 0; i < 8; i++) { 1563 if (dcolon == 1) { 1564 if (*a == 0) { 1565 if (i == 7) 1566 *cp++ = ':'; 1567 a++; 1568 continue; 1569 } else 1570 dcolon = 2; 1571 } 1572 if (*a == 0) { 1573 if (dcolon == 0 && *(a + 1) == 0 && i == index) { 1574 if (i == 0) 1575 *cp++ = ':'; 1576 *cp++ = ':'; 1577 dcolon = 1; 1578 } else { 1579 *cp++ = '0'; 1580 *cp++ = ':'; 1581 } 1582 a++; 1583 continue; 1584 } 1585 d = (const u_char *)a; 1586 /* Try to eliminate leading zeros in printout like in :0001. */ 1587 zero = 1; 1588 *cp = digits[*d >> 4]; 1589 if (*cp != '0') { 1590 zero = 0; 1591 cp++; 1592 } 1593 *cp = digits[*d++ & 0xf]; 1594 if (zero == 0 || (*cp != '0')) { 1595 zero = 0; 1596 cp++; 1597 } 1598 *cp = digits[*d >> 4]; 1599 if (zero == 0 || (*cp != '0')) { 1600 zero = 0; 1601 cp++; 1602 } 1603 *cp++ = digits[*d & 0xf]; 1604 *cp++ = ':'; 1605 a++; 1606 } 1607 *--cp = '\0'; 1608 return (ip6buf); 1609 } 1610 1611 int 1612 in6_localaddr(struct in6_addr *in6) 1613 { 1614 struct rm_priotracker in6_ifa_tracker; 1615 struct in6_ifaddr *ia; 1616 1617 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1618 return 1; 1619 1620 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1621 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 1622 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1623 &ia->ia_prefixmask.sin6_addr)) { 1624 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1625 return 1; 1626 } 1627 } 1628 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1629 1630 return (0); 1631 } 1632 1633 /* 1634 * Return 1 if an internet address is for the local host and configured 1635 * on one of its interfaces. 1636 */ 1637 int 1638 in6_localip(struct in6_addr *in6) 1639 { 1640 struct rm_priotracker in6_ifa_tracker; 1641 struct in6_ifaddr *ia; 1642 1643 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1644 LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 1645 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) { 1646 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1647 return (1); 1648 } 1649 } 1650 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1651 return (0); 1652 } 1653 1654 /* 1655 * Return 1 if an internet address is configured on an interface. 1656 */ 1657 int 1658 in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr) 1659 { 1660 struct in6_addr in6; 1661 struct ifaddr *ifa; 1662 struct in6_ifaddr *ia6; 1663 1664 in6 = *addr; 1665 if (in6_clearscope(&in6)) 1666 return (0); 1667 in6_setscope(&in6, ifp, NULL); 1668 1669 IF_ADDR_RLOCK(ifp); 1670 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1671 if (ifa->ifa_addr->sa_family != AF_INET6) 1672 continue; 1673 ia6 = (struct in6_ifaddr *)ifa; 1674 if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) { 1675 IF_ADDR_RUNLOCK(ifp); 1676 return (1); 1677 } 1678 } 1679 IF_ADDR_RUNLOCK(ifp); 1680 1681 return (0); 1682 } 1683 1684 int 1685 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1686 { 1687 struct rm_priotracker in6_ifa_tracker; 1688 struct in6_ifaddr *ia; 1689 1690 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1691 LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) { 1692 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) { 1693 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 1694 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1695 return (1); /* true */ 1696 } 1697 break; 1698 } 1699 } 1700 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1701 1702 return (0); /* false */ 1703 } 1704 1705 /* 1706 * return length of part which dst and src are equal 1707 * hard coding... 1708 */ 1709 int 1710 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1711 { 1712 int match = 0; 1713 u_char *s = (u_char *)src, *d = (u_char *)dst; 1714 u_char *lim = s + 16, r; 1715 1716 while (s < lim) 1717 if ((r = (*d++ ^ *s++)) != 0) { 1718 while (r < 128) { 1719 match++; 1720 r <<= 1; 1721 } 1722 break; 1723 } else 1724 match += 8; 1725 return match; 1726 } 1727 1728 /* XXX: to be scope conscious */ 1729 int 1730 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1731 { 1732 int bytelen, bitlen; 1733 1734 /* sanity check */ 1735 if (0 > len || len > 128) { 1736 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1737 len); 1738 return (0); 1739 } 1740 1741 bytelen = len / 8; 1742 bitlen = len % 8; 1743 1744 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1745 return (0); 1746 if (bitlen != 0 && 1747 p1->s6_addr[bytelen] >> (8 - bitlen) != 1748 p2->s6_addr[bytelen] >> (8 - bitlen)) 1749 return (0); 1750 1751 return (1); 1752 } 1753 1754 void 1755 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1756 { 1757 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1758 int bytelen, bitlen, i; 1759 1760 /* sanity check */ 1761 if (0 > len || len > 128) { 1762 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1763 len); 1764 return; 1765 } 1766 1767 bzero(maskp, sizeof(*maskp)); 1768 bytelen = len / 8; 1769 bitlen = len % 8; 1770 for (i = 0; i < bytelen; i++) 1771 maskp->s6_addr[i] = 0xff; 1772 if (bitlen) 1773 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1774 } 1775 1776 /* 1777 * return the best address out of the same scope. if no address was 1778 * found, return the first valid address from designated IF. 1779 */ 1780 struct in6_ifaddr * 1781 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 1782 { 1783 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 1784 struct ifaddr *ifa; 1785 struct in6_ifaddr *besta = NULL; 1786 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 1787 1788 dep[0] = dep[1] = NULL; 1789 1790 /* 1791 * We first look for addresses in the same scope. 1792 * If there is one, return it. 1793 * If two or more, return one which matches the dst longest. 1794 * If none, return one of global addresses assigned other ifs. 1795 */ 1796 IF_ADDR_RLOCK(ifp); 1797 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1798 if (ifa->ifa_addr->sa_family != AF_INET6) 1799 continue; 1800 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1801 continue; /* XXX: is there any case to allow anycast? */ 1802 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1803 continue; /* don't use this interface */ 1804 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1805 continue; 1806 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1807 if (V_ip6_use_deprecated) 1808 dep[0] = (struct in6_ifaddr *)ifa; 1809 continue; 1810 } 1811 1812 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 1813 /* 1814 * call in6_matchlen() as few as possible 1815 */ 1816 if (besta) { 1817 if (blen == -1) 1818 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 1819 tlen = in6_matchlen(IFA_IN6(ifa), dst); 1820 if (tlen > blen) { 1821 blen = tlen; 1822 besta = (struct in6_ifaddr *)ifa; 1823 } 1824 } else 1825 besta = (struct in6_ifaddr *)ifa; 1826 } 1827 } 1828 if (besta) { 1829 ifa_ref(&besta->ia_ifa); 1830 IF_ADDR_RUNLOCK(ifp); 1831 return (besta); 1832 } 1833 1834 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1835 if (ifa->ifa_addr->sa_family != AF_INET6) 1836 continue; 1837 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1838 continue; /* XXX: is there any case to allow anycast? */ 1839 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1840 continue; /* don't use this interface */ 1841 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1842 continue; 1843 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1844 if (V_ip6_use_deprecated) 1845 dep[1] = (struct in6_ifaddr *)ifa; 1846 continue; 1847 } 1848 1849 if (ifa != NULL) 1850 ifa_ref(ifa); 1851 IF_ADDR_RUNLOCK(ifp); 1852 return (struct in6_ifaddr *)ifa; 1853 } 1854 1855 /* use the last-resort values, that are, deprecated addresses */ 1856 if (dep[0]) { 1857 ifa_ref((struct ifaddr *)dep[0]); 1858 IF_ADDR_RUNLOCK(ifp); 1859 return dep[0]; 1860 } 1861 if (dep[1]) { 1862 ifa_ref((struct ifaddr *)dep[1]); 1863 IF_ADDR_RUNLOCK(ifp); 1864 return dep[1]; 1865 } 1866 1867 IF_ADDR_RUNLOCK(ifp); 1868 return NULL; 1869 } 1870 1871 /* 1872 * perform DAD when interface becomes IFF_UP. 1873 */ 1874 void 1875 in6_if_up(struct ifnet *ifp) 1876 { 1877 struct ifaddr *ifa; 1878 struct in6_ifaddr *ia; 1879 1880 IF_ADDR_RLOCK(ifp); 1881 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1882 if (ifa->ifa_addr->sa_family != AF_INET6) 1883 continue; 1884 ia = (struct in6_ifaddr *)ifa; 1885 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 1886 /* 1887 * The TENTATIVE flag was likely set by hand 1888 * beforehand, implicitly indicating the need for DAD. 1889 * We may be able to skip the random delay in this 1890 * case, but we impose delays just in case. 1891 */ 1892 nd6_dad_start(ifa, 1893 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 1894 } 1895 } 1896 IF_ADDR_RUNLOCK(ifp); 1897 1898 /* 1899 * special cases, like 6to4, are handled in in6_ifattach 1900 */ 1901 in6_ifattach(ifp, NULL); 1902 } 1903 1904 int 1905 in6if_do_dad(struct ifnet *ifp) 1906 { 1907 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 1908 return (0); 1909 1910 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) || 1911 (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD)) 1912 return (0); 1913 1914 /* 1915 * Our DAD routine requires the interface up and running. 1916 * However, some interfaces can be up before the RUNNING 1917 * status. Additionally, users may try to assign addresses 1918 * before the interface becomes up (or running). 1919 * This function returns EAGAIN in that case. 1920 * The caller should mark "tentative" on the address instead of 1921 * performing DAD immediately. 1922 */ 1923 if (!((ifp->if_flags & IFF_UP) && 1924 (ifp->if_drv_flags & IFF_DRV_RUNNING))) 1925 return (EAGAIN); 1926 1927 return (1); 1928 } 1929 1930 /* 1931 * Calculate max IPv6 MTU through all the interfaces and store it 1932 * to in6_maxmtu. 1933 */ 1934 void 1935 in6_setmaxmtu(void) 1936 { 1937 unsigned long maxmtu = 0; 1938 struct ifnet *ifp; 1939 1940 IFNET_RLOCK_NOSLEEP(); 1941 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1942 /* this function can be called during ifnet initialization */ 1943 if (!ifp->if_afdata[AF_INET6]) 1944 continue; 1945 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 1946 IN6_LINKMTU(ifp) > maxmtu) 1947 maxmtu = IN6_LINKMTU(ifp); 1948 } 1949 IFNET_RUNLOCK_NOSLEEP(); 1950 if (maxmtu) /* update only when maxmtu is positive */ 1951 V_in6_maxmtu = maxmtu; 1952 } 1953 1954 /* 1955 * Provide the length of interface identifiers to be used for the link attached 1956 * to the given interface. The length should be defined in "IPv6 over 1957 * xxx-link" document. Note that address architecture might also define 1958 * the length for a particular set of address prefixes, regardless of the 1959 * link type. As clarified in rfc2462bis, those two definitions should be 1960 * consistent, and those really are as of August 2004. 1961 */ 1962 int 1963 in6_if2idlen(struct ifnet *ifp) 1964 { 1965 switch (ifp->if_type) { 1966 case IFT_ETHER: /* RFC2464 */ 1967 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 1968 case IFT_L2VLAN: /* ditto */ 1969 case IFT_BRIDGE: /* bridge(4) only does Ethernet-like links */ 1970 case IFT_INFINIBAND: 1971 return (64); 1972 case IFT_FDDI: /* RFC2467 */ 1973 return (64); 1974 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 1975 return (64); 1976 case IFT_PPP: /* RFC2472 */ 1977 return (64); 1978 case IFT_ARCNET: /* RFC2497 */ 1979 return (64); 1980 case IFT_FRELAY: /* RFC2590 */ 1981 return (64); 1982 case IFT_IEEE1394: /* RFC3146 */ 1983 return (64); 1984 case IFT_GIF: 1985 return (64); /* draft-ietf-v6ops-mech-v2-07 */ 1986 case IFT_LOOP: 1987 return (64); /* XXX: is this really correct? */ 1988 default: 1989 /* 1990 * Unknown link type: 1991 * It might be controversial to use the today's common constant 1992 * of 64 for these cases unconditionally. For full compliance, 1993 * we should return an error in this case. On the other hand, 1994 * if we simply miss the standard for the link type or a new 1995 * standard is defined for a new link type, the IFID length 1996 * is very likely to be the common constant. As a compromise, 1997 * we always use the constant, but make an explicit notice 1998 * indicating the "unknown" case. 1999 */ 2000 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2001 return (64); 2002 } 2003 } 2004 2005 #include <sys/sysctl.h> 2006 2007 struct in6_llentry { 2008 struct llentry base; 2009 }; 2010 2011 #define IN6_LLTBL_DEFAULT_HSIZE 32 2012 #define IN6_LLTBL_HASH(k, h) \ 2013 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 2014 2015 /* 2016 * Do actual deallocation of @lle. 2017 */ 2018 static void 2019 in6_lltable_destroy_lle_unlocked(struct llentry *lle) 2020 { 2021 2022 LLE_LOCK_DESTROY(lle); 2023 LLE_REQ_DESTROY(lle); 2024 free(lle, M_LLTABLE); 2025 } 2026 2027 /* 2028 * Called by LLE_FREE_LOCKED when number of references 2029 * drops to zero. 2030 */ 2031 static void 2032 in6_lltable_destroy_lle(struct llentry *lle) 2033 { 2034 2035 LLE_WUNLOCK(lle); 2036 in6_lltable_destroy_lle_unlocked(lle); 2037 } 2038 2039 static struct llentry * 2040 in6_lltable_new(const struct in6_addr *addr6, u_int flags) 2041 { 2042 struct in6_llentry *lle; 2043 2044 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 2045 if (lle == NULL) /* NB: caller generates msg */ 2046 return NULL; 2047 2048 lle->base.r_l3addr.addr6 = *addr6; 2049 lle->base.lle_refcnt = 1; 2050 lle->base.lle_free = in6_lltable_destroy_lle; 2051 LLE_LOCK_INIT(&lle->base); 2052 LLE_REQ_INIT(&lle->base); 2053 callout_init(&lle->base.lle_timer, 1); 2054 2055 return (&lle->base); 2056 } 2057 2058 static int 2059 in6_lltable_match_prefix(const struct sockaddr *saddr, 2060 const struct sockaddr *smask, u_int flags, struct llentry *lle) 2061 { 2062 const struct in6_addr *addr, *mask, *lle_addr; 2063 2064 addr = &((const struct sockaddr_in6 *)saddr)->sin6_addr; 2065 mask = &((const struct sockaddr_in6 *)smask)->sin6_addr; 2066 lle_addr = &lle->r_l3addr.addr6; 2067 2068 if (IN6_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0) 2069 return (0); 2070 2071 if (lle->la_flags & LLE_IFADDR) { 2072 2073 /* 2074 * Delete LLE_IFADDR records IFF address & flag matches. 2075 * Note that addr is the interface address within prefix 2076 * being matched. 2077 */ 2078 if (IN6_ARE_ADDR_EQUAL(addr, lle_addr) && 2079 (flags & LLE_STATIC) != 0) 2080 return (1); 2081 return (0); 2082 } 2083 2084 /* flags & LLE_STATIC means deleting both dynamic and static entries */ 2085 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC)) 2086 return (1); 2087 2088 return (0); 2089 } 2090 2091 static void 2092 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle) 2093 { 2094 struct ifnet *ifp; 2095 2096 LLE_WLOCK_ASSERT(lle); 2097 KASSERT(llt != NULL, ("lltable is NULL")); 2098 2099 /* Unlink entry from table */ 2100 if ((lle->la_flags & LLE_LINKED) != 0) { 2101 2102 ifp = llt->llt_ifp; 2103 IF_AFDATA_WLOCK_ASSERT(ifp); 2104 lltable_unlink_entry(llt, lle); 2105 } 2106 2107 if (callout_stop(&lle->lle_timer) > 0) 2108 LLE_REMREF(lle); 2109 2110 llentry_free(lle); 2111 } 2112 2113 static int 2114 in6_lltable_rtcheck(struct ifnet *ifp, 2115 u_int flags, 2116 const struct sockaddr *l3addr) 2117 { 2118 const struct sockaddr_in6 *sin6; 2119 struct nhop6_basic nh6; 2120 struct in6_addr dst; 2121 uint32_t scopeid; 2122 int error; 2123 char ip6buf[INET6_ADDRSTRLEN]; 2124 int fibnum; 2125 2126 KASSERT(l3addr->sa_family == AF_INET6, 2127 ("sin_family %d", l3addr->sa_family)); 2128 2129 sin6 = (const struct sockaddr_in6 *)l3addr; 2130 in6_splitscope(&sin6->sin6_addr, &dst, &scopeid); 2131 fibnum = V_rt_add_addr_allfibs ? RT_DEFAULT_FIB : ifp->if_fib; 2132 error = fib6_lookup_nh_basic(fibnum, &dst, scopeid, 0, 0, &nh6); 2133 if (error != 0 || (nh6.nh_flags & NHF_GATEWAY) || nh6.nh_ifp != ifp) { 2134 struct ifaddr *ifa; 2135 /* 2136 * Create an ND6 cache for an IPv6 neighbor 2137 * that is not covered by our own prefix. 2138 */ 2139 ifa = ifaof_ifpforaddr(l3addr, ifp); 2140 if (ifa != NULL) { 2141 ifa_free(ifa); 2142 return 0; 2143 } 2144 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2145 ip6_sprintf(ip6buf, &sin6->sin6_addr)); 2146 return EINVAL; 2147 } 2148 return 0; 2149 } 2150 2151 static inline uint32_t 2152 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize) 2153 { 2154 2155 return (IN6_LLTBL_HASH(dst->s6_addr32[3], hsize)); 2156 } 2157 2158 static uint32_t 2159 in6_lltable_hash(const struct llentry *lle, uint32_t hsize) 2160 { 2161 2162 return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize)); 2163 } 2164 2165 static void 2166 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 2167 { 2168 struct sockaddr_in6 *sin6; 2169 2170 sin6 = (struct sockaddr_in6 *)sa; 2171 bzero(sin6, sizeof(*sin6)); 2172 sin6->sin6_family = AF_INET6; 2173 sin6->sin6_len = sizeof(*sin6); 2174 sin6->sin6_addr = lle->r_l3addr.addr6; 2175 } 2176 2177 static inline struct llentry * 2178 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst) 2179 { 2180 struct llentry *lle; 2181 struct llentries *lleh; 2182 u_int hashidx; 2183 2184 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize); 2185 lleh = &llt->lle_head[hashidx]; 2186 LIST_FOREACH(lle, lleh, lle_next) { 2187 if (lle->la_flags & LLE_DELETED) 2188 continue; 2189 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst)) 2190 break; 2191 } 2192 2193 return (lle); 2194 } 2195 2196 static void 2197 in6_lltable_delete_entry(struct lltable *llt, struct llentry *lle) 2198 { 2199 2200 lle->la_flags |= LLE_DELETED; 2201 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 2202 #ifdef DIAGNOSTIC 2203 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2204 #endif 2205 llentry_free(lle); 2206 } 2207 2208 static struct llentry * 2209 in6_lltable_alloc(struct lltable *llt, u_int flags, 2210 const struct sockaddr *l3addr) 2211 { 2212 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2213 struct ifnet *ifp = llt->llt_ifp; 2214 struct llentry *lle; 2215 char linkhdr[LLE_MAX_LINKHDR]; 2216 size_t linkhdrsize; 2217 int lladdr_off; 2218 2219 KASSERT(l3addr->sa_family == AF_INET6, 2220 ("sin_family %d", l3addr->sa_family)); 2221 2222 /* 2223 * A route that covers the given address must have 2224 * been installed 1st because we are doing a resolution, 2225 * verify this. 2226 */ 2227 if (!(flags & LLE_IFADDR) && 2228 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2229 return (NULL); 2230 2231 lle = in6_lltable_new(&sin6->sin6_addr, flags); 2232 if (lle == NULL) { 2233 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2234 return (NULL); 2235 } 2236 lle->la_flags = flags; 2237 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 2238 linkhdrsize = LLE_MAX_LINKHDR; 2239 if (lltable_calc_llheader(ifp, AF_INET6, IF_LLADDR(ifp), 2240 linkhdr, &linkhdrsize, &lladdr_off) != 0) { 2241 in6_lltable_destroy_lle_unlocked(lle); 2242 return (NULL); 2243 } 2244 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize, 2245 lladdr_off); 2246 lle->la_flags |= LLE_STATIC; 2247 } 2248 2249 if ((lle->la_flags & LLE_STATIC) != 0) 2250 lle->ln_state = ND6_LLINFO_REACHABLE; 2251 2252 return (lle); 2253 } 2254 2255 static struct llentry * 2256 in6_lltable_lookup(struct lltable *llt, u_int flags, 2257 const struct sockaddr *l3addr) 2258 { 2259 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2260 struct llentry *lle; 2261 2262 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 2263 KASSERT(l3addr->sa_family == AF_INET6, 2264 ("sin_family %d", l3addr->sa_family)); 2265 2266 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2267 2268 if (lle == NULL) 2269 return (NULL); 2270 2271 KASSERT((flags & (LLE_UNLOCKED|LLE_EXCLUSIVE)) != 2272 (LLE_UNLOCKED|LLE_EXCLUSIVE),("wrong lle request flags: 0x%X", 2273 flags)); 2274 2275 if (flags & LLE_UNLOCKED) 2276 return (lle); 2277 2278 if (flags & LLE_EXCLUSIVE) 2279 LLE_WLOCK(lle); 2280 else 2281 LLE_RLOCK(lle); 2282 return (lle); 2283 } 2284 2285 static int 2286 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 2287 struct sysctl_req *wr) 2288 { 2289 struct ifnet *ifp = llt->llt_ifp; 2290 /* XXX stack use */ 2291 struct { 2292 struct rt_msghdr rtm; 2293 struct sockaddr_in6 sin6; 2294 /* 2295 * ndp.c assumes that sdl is word aligned 2296 */ 2297 #ifdef __LP64__ 2298 uint32_t pad; 2299 #endif 2300 struct sockaddr_dl sdl; 2301 } ndpc; 2302 struct sockaddr_dl *sdl; 2303 int error; 2304 2305 bzero(&ndpc, sizeof(ndpc)); 2306 /* skip deleted entries */ 2307 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 2308 return (0); 2309 /* Skip if jailed and not a valid IP of the prison. */ 2310 lltable_fill_sa_entry(lle, 2311 (struct sockaddr *)&ndpc.sin6); 2312 if (prison_if(wr->td->td_ucred, 2313 (struct sockaddr *)&ndpc.sin6) != 0) 2314 return (0); 2315 /* 2316 * produce a msg made of: 2317 * struct rt_msghdr; 2318 * struct sockaddr_in6 (IPv6) 2319 * struct sockaddr_dl; 2320 */ 2321 ndpc.rtm.rtm_msglen = sizeof(ndpc); 2322 ndpc.rtm.rtm_version = RTM_VERSION; 2323 ndpc.rtm.rtm_type = RTM_GET; 2324 ndpc.rtm.rtm_flags = RTF_UP; 2325 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 2326 if (V_deembed_scopeid) 2327 sa6_recoverscope(&ndpc.sin6); 2328 2329 /* publish */ 2330 if (lle->la_flags & LLE_PUB) 2331 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE; 2332 2333 sdl = &ndpc.sdl; 2334 sdl->sdl_family = AF_LINK; 2335 sdl->sdl_len = sizeof(*sdl); 2336 sdl->sdl_index = ifp->if_index; 2337 sdl->sdl_type = ifp->if_type; 2338 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 2339 sdl->sdl_alen = ifp->if_addrlen; 2340 bcopy(lle->ll_addr, LLADDR(sdl), 2341 ifp->if_addrlen); 2342 } else { 2343 sdl->sdl_alen = 0; 2344 bzero(LLADDR(sdl), ifp->if_addrlen); 2345 } 2346 if (lle->la_expire != 0) 2347 ndpc.rtm.rtm_rmx.rmx_expire = lle->la_expire + 2348 lle->lle_remtime / hz + 2349 time_second - time_uptime; 2350 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 2351 if (lle->la_flags & LLE_STATIC) 2352 ndpc.rtm.rtm_flags |= RTF_STATIC; 2353 if (lle->la_flags & LLE_IFADDR) 2354 ndpc.rtm.rtm_flags |= RTF_PINNED; 2355 if (lle->ln_router != 0) 2356 ndpc.rtm.rtm_flags |= RTF_GATEWAY; 2357 ndpc.rtm.rtm_rmx.rmx_pksent = lle->la_asked; 2358 /* Store state in rmx_weight value */ 2359 ndpc.rtm.rtm_rmx.rmx_state = lle->ln_state; 2360 ndpc.rtm.rtm_index = ifp->if_index; 2361 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc)); 2362 2363 return (error); 2364 } 2365 2366 static struct lltable * 2367 in6_lltattach(struct ifnet *ifp) 2368 { 2369 struct lltable *llt; 2370 2371 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE); 2372 llt->llt_af = AF_INET6; 2373 llt->llt_ifp = ifp; 2374 2375 llt->llt_lookup = in6_lltable_lookup; 2376 llt->llt_alloc_entry = in6_lltable_alloc; 2377 llt->llt_delete_entry = in6_lltable_delete_entry; 2378 llt->llt_dump_entry = in6_lltable_dump_entry; 2379 llt->llt_hash = in6_lltable_hash; 2380 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry; 2381 llt->llt_free_entry = in6_lltable_free_entry; 2382 llt->llt_match_prefix = in6_lltable_match_prefix; 2383 lltable_link(llt); 2384 2385 return (llt); 2386 } 2387 2388 void * 2389 in6_domifattach(struct ifnet *ifp) 2390 { 2391 struct in6_ifextra *ext; 2392 2393 /* There are not IPv6-capable interfaces. */ 2394 switch (ifp->if_type) { 2395 case IFT_PFLOG: 2396 case IFT_PFSYNC: 2397 case IFT_USB: 2398 return (NULL); 2399 } 2400 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2401 bzero(ext, sizeof(*ext)); 2402 2403 ext->in6_ifstat = malloc(sizeof(counter_u64_t) * 2404 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK); 2405 COUNTER_ARRAY_ALLOC(ext->in6_ifstat, 2406 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK); 2407 2408 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) * 2409 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR, 2410 M_WAITOK); 2411 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat, 2412 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK); 2413 2414 ext->nd_ifinfo = nd6_ifattach(ifp); 2415 ext->scope6_id = scope6_ifattach(ifp); 2416 ext->lltable = in6_lltattach(ifp); 2417 2418 ext->mld_ifinfo = mld_domifattach(ifp); 2419 2420 return ext; 2421 } 2422 2423 int 2424 in6_domifmtu(struct ifnet *ifp) 2425 { 2426 if (ifp->if_afdata[AF_INET6] == NULL) 2427 return ifp->if_mtu; 2428 2429 return (IN6_LINKMTU(ifp)); 2430 } 2431 2432 void 2433 in6_domifdetach(struct ifnet *ifp, void *aux) 2434 { 2435 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2436 2437 mld_domifdetach(ifp); 2438 scope6_ifdetach(ext->scope6_id); 2439 nd6_ifdetach(ifp, ext->nd_ifinfo); 2440 lltable_free(ext->lltable); 2441 COUNTER_ARRAY_FREE(ext->in6_ifstat, 2442 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 2443 free(ext->in6_ifstat, M_IFADDR); 2444 COUNTER_ARRAY_FREE(ext->icmp6_ifstat, 2445 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 2446 free(ext->icmp6_ifstat, M_IFADDR); 2447 free(ext, M_IFADDR); 2448 } 2449 2450 /* 2451 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2452 * v4 mapped addr or v4 compat addr 2453 */ 2454 void 2455 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2456 { 2457 2458 bzero(sin, sizeof(*sin)); 2459 sin->sin_len = sizeof(struct sockaddr_in); 2460 sin->sin_family = AF_INET; 2461 sin->sin_port = sin6->sin6_port; 2462 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2463 } 2464 2465 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2466 void 2467 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2468 { 2469 bzero(sin6, sizeof(*sin6)); 2470 sin6->sin6_len = sizeof(struct sockaddr_in6); 2471 sin6->sin6_family = AF_INET6; 2472 sin6->sin6_port = sin->sin_port; 2473 sin6->sin6_addr.s6_addr32[0] = 0; 2474 sin6->sin6_addr.s6_addr32[1] = 0; 2475 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2476 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2477 } 2478 2479 /* Convert sockaddr_in6 into sockaddr_in. */ 2480 void 2481 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2482 { 2483 struct sockaddr_in *sin_p; 2484 struct sockaddr_in6 sin6; 2485 2486 /* 2487 * Save original sockaddr_in6 addr and convert it 2488 * to sockaddr_in. 2489 */ 2490 sin6 = *(struct sockaddr_in6 *)nam; 2491 sin_p = (struct sockaddr_in *)nam; 2492 in6_sin6_2_sin(sin_p, &sin6); 2493 } 2494 2495 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2496 void 2497 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2498 { 2499 struct sockaddr_in *sin_p; 2500 struct sockaddr_in6 *sin6_p; 2501 2502 sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK); 2503 sin_p = (struct sockaddr_in *)*nam; 2504 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2505 free(*nam, M_SONAME); 2506 *nam = (struct sockaddr *)sin6_p; 2507 } 2508