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: stable/11/sys/netinet6/in6.c 338081 2018-08-20 01:01:33Z loos $"); 65 66#include "opt_compat.h" 67#include "opt_inet.h" 68#include "opt_inet6.h" 69 70#include <sys/param.h> 71#include <sys/eventhandler.h> 72#include <sys/errno.h> 73#include <sys/jail.h> 74#include <sys/malloc.h> 75#include <sys/socket.h> 76#include <sys/socketvar.h> 77#include <sys/sockio.h> 78#include <sys/systm.h> 79#include <sys/priv.h> 80#include <sys/proc.h> 81#include <sys/time.h> 82#include <sys/kernel.h> 83#include <sys/lock.h> 84#include <sys/rmlock.h> 85#include <sys/syslog.h> 86 87#include <net/if.h> 88#include <net/if_var.h> 89#include <net/if_types.h> 90#include <net/route.h> 91#include <net/if_dl.h> 92#include <net/vnet.h> 93 94#include <netinet/in.h> 95#include <netinet/in_var.h> 96#include <net/if_llatbl.h> 97#include <netinet/if_ether.h> 98#include <netinet/in_systm.h> 99#include <netinet/ip.h> 100#include <netinet/in_pcb.h> 101#include <netinet/ip_carp.h> 102 103#include <netinet/ip6.h> 104#include <netinet6/ip6_var.h> 105#include <netinet6/nd6.h> 106#include <netinet6/mld6_var.h> 107#include <netinet6/ip6_mroute.h> 108#include <netinet6/in6_ifattach.h> 109#include <netinet6/scope6_var.h> 110#include <netinet6/in6_fib.h> 111#include <netinet6/in6_pcb.h> 112 113VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix); 114#define V_icmp6_nodeinfo_oldmcprefix VNET(icmp6_nodeinfo_oldmcprefix) 115 116/* 117 * Definitions of some costant IP6 addresses. 118 */ 119const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 120const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 121const struct in6_addr in6addr_nodelocal_allnodes = 122 IN6ADDR_NODELOCAL_ALLNODES_INIT; 123const struct in6_addr in6addr_linklocal_allnodes = 124 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 125const struct in6_addr in6addr_linklocal_allrouters = 126 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 127const struct in6_addr in6addr_linklocal_allv2routers = 128 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT; 129 130const struct in6_addr in6mask0 = IN6MASK0; 131const struct in6_addr in6mask32 = IN6MASK32; 132const struct in6_addr in6mask64 = IN6MASK64; 133const struct in6_addr in6mask96 = IN6MASK96; 134const struct in6_addr in6mask128 = IN6MASK128; 135 136const struct sockaddr_in6 sa6_any = 137 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 }; 138 139static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *, 140 struct in6_aliasreq *, int); 141static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 142 143static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *, 144 struct in6_ifaddr *, int); 145static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *, 146 struct in6_aliasreq *, int flags); 147static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *, 148 struct in6_ifaddr *, int, int); 149static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *, 150 struct in6_ifaddr *, int); 151 152#define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 153#define ia62ifa(ia6) (&((ia6)->ia_ifa)) 154 155 156void 157in6_newaddrmsg(struct in6_ifaddr *ia, int cmd) 158{ 159 struct sockaddr_dl gateway; 160 struct sockaddr_in6 mask, addr; 161 struct rtentry rt; 162 int fibnum; 163 164 /* 165 * initialize for rtmsg generation 166 */ 167 bzero(&gateway, sizeof(gateway)); 168 gateway.sdl_len = sizeof(gateway); 169 gateway.sdl_family = AF_LINK; 170 171 bzero(&rt, sizeof(rt)); 172 rt.rt_gateway = (struct sockaddr *)&gateway; 173 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 174 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr)); 175 rt_mask(&rt) = (struct sockaddr *)&mask; 176 rt_key(&rt) = (struct sockaddr *)&addr; 177 rt.rt_flags = RTF_HOST | RTF_STATIC; 178 if (cmd == RTM_ADD) 179 rt.rt_flags |= RTF_UP; 180 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS : ia62ifa(ia)->ifa_ifp->if_fib; 181 /* Announce arrival of local address to this FIB. */ 182 rt_newaddrmsg_fib(cmd, &ia->ia_ifa, 0, &rt, fibnum); 183} 184 185int 186in6_mask2len(struct in6_addr *mask, u_char *lim0) 187{ 188 int x = 0, y; 189 u_char *lim = lim0, *p; 190 191 /* ignore the scope_id part */ 192 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 193 lim = (u_char *)mask + sizeof(*mask); 194 for (p = (u_char *)mask; p < lim; x++, p++) { 195 if (*p != 0xff) 196 break; 197 } 198 y = 0; 199 if (p < lim) { 200 for (y = 0; y < 8; y++) { 201 if ((*p & (0x80 >> y)) == 0) 202 break; 203 } 204 } 205 206 /* 207 * when the limit pointer is given, do a stricter check on the 208 * remaining bits. 209 */ 210 if (p < lim) { 211 if (y != 0 && (*p & (0x00ff >> y)) != 0) 212 return (-1); 213 for (p = p + 1; p < lim; p++) 214 if (*p != 0) 215 return (-1); 216 } 217 218 return x * 8 + y; 219} 220 221#ifdef COMPAT_FREEBSD32 222struct in6_ndifreq32 { 223 char ifname[IFNAMSIZ]; 224 uint32_t ifindex; 225}; 226#define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32) 227#endif 228 229int 230in6_control(struct socket *so, u_long cmd, caddr_t data, 231 struct ifnet *ifp, struct thread *td) 232{ 233 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 234 struct in6_ifaddr *ia = NULL; 235 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 236 struct sockaddr_in6 *sa6; 237 int carp_attached = 0; 238 int error; 239 u_long ocmd = cmd; 240 241 /* 242 * Compat to make pre-10.x ifconfig(8) operable. 243 */ 244 if (cmd == OSIOCAIFADDR_IN6) 245 cmd = SIOCAIFADDR_IN6; 246 247 switch (cmd) { 248 case SIOCGETSGCNT_IN6: 249 case SIOCGETMIFCNT_IN6: 250 /* 251 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c. 252 * We cannot see how that would be needed, so do not adjust the 253 * KPI blindly; more likely should clean up the IPv4 variant. 254 */ 255 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP); 256 } 257 258 switch (cmd) { 259 case SIOCAADDRCTL_POLICY: 260 case SIOCDADDRCTL_POLICY: 261 if (td != NULL) { 262 error = priv_check(td, PRIV_NETINET_ADDRCTRL6); 263 if (error) 264 return (error); 265 } 266 return (in6_src_ioctl(cmd, data)); 267 } 268 269 if (ifp == NULL) 270 return (EOPNOTSUPP); 271 272 switch (cmd) { 273 case SIOCSNDFLUSH_IN6: 274 case SIOCSPFXFLUSH_IN6: 275 case SIOCSRTRFLUSH_IN6: 276 case SIOCSDEFIFACE_IN6: 277 case SIOCSIFINFO_FLAGS: 278 case SIOCSIFINFO_IN6: 279 if (td != NULL) { 280 error = priv_check(td, PRIV_NETINET_ND6); 281 if (error) 282 return (error); 283 } 284 /* FALLTHROUGH */ 285 case OSIOCGIFINFO_IN6: 286 case SIOCGIFINFO_IN6: 287 case SIOCGNBRINFO_IN6: 288 case SIOCGDEFIFACE_IN6: 289 return (nd6_ioctl(cmd, data, ifp)); 290 291#ifdef COMPAT_FREEBSD32 292 case SIOCGDEFIFACE32_IN6: 293 { 294 struct in6_ndifreq ndif; 295 struct in6_ndifreq32 *ndif32; 296 297 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif, 298 ifp); 299 if (error) 300 return (error); 301 ndif32 = (struct in6_ndifreq32 *)data; 302 ndif32->ifindex = ndif.ifindex; 303 return (0); 304 } 305#endif 306 } 307 308 switch (cmd) { 309 case SIOCSIFPREFIX_IN6: 310 case SIOCDIFPREFIX_IN6: 311 case SIOCAIFPREFIX_IN6: 312 case SIOCCIFPREFIX_IN6: 313 case SIOCSGIFPREFIX_IN6: 314 case SIOCGIFPREFIX_IN6: 315 log(LOG_NOTICE, 316 "prefix ioctls are now invalidated. " 317 "please use ifconfig.\n"); 318 return (EOPNOTSUPP); 319 } 320 321 switch (cmd) { 322 case SIOCSSCOPE6: 323 if (td != NULL) { 324 error = priv_check(td, PRIV_NETINET_SCOPE6); 325 if (error) 326 return (error); 327 } 328 /* FALLTHROUGH */ 329 case SIOCGSCOPE6: 330 case SIOCGSCOPE6DEF: 331 return (scope6_ioctl(cmd, data, ifp)); 332 } 333 334 /* 335 * Find address for this interface, if it exists. 336 * 337 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 338 * only, and used the first interface address as the target of other 339 * operations (without checking ifra_addr). This was because netinet 340 * code/API assumed at most 1 interface address per interface. 341 * Since IPv6 allows a node to assign multiple addresses 342 * on a single interface, we almost always look and check the 343 * presence of ifra_addr, and reject invalid ones here. 344 * It also decreases duplicated code among SIOC*_IN6 operations. 345 */ 346 switch (cmd) { 347 case SIOCAIFADDR_IN6: 348 case SIOCSIFPHYADDR_IN6: 349 sa6 = &ifra->ifra_addr; 350 break; 351 case SIOCSIFADDR_IN6: 352 case SIOCGIFADDR_IN6: 353 case SIOCSIFDSTADDR_IN6: 354 case SIOCSIFNETMASK_IN6: 355 case SIOCGIFDSTADDR_IN6: 356 case SIOCGIFNETMASK_IN6: 357 case SIOCDIFADDR_IN6: 358 case SIOCGIFPSRCADDR_IN6: 359 case SIOCGIFPDSTADDR_IN6: 360 case SIOCGIFAFLAG_IN6: 361 case SIOCSNDFLUSH_IN6: 362 case SIOCSPFXFLUSH_IN6: 363 case SIOCSRTRFLUSH_IN6: 364 case SIOCGIFALIFETIME_IN6: 365 case SIOCGIFSTAT_IN6: 366 case SIOCGIFSTAT_ICMP6: 367 sa6 = &ifr->ifr_addr; 368 break; 369 case SIOCSIFADDR: 370 case SIOCSIFBRDADDR: 371 case SIOCSIFDSTADDR: 372 case SIOCSIFNETMASK: 373 /* 374 * Although we should pass any non-INET6 ioctl requests 375 * down to driver, we filter some legacy INET requests. 376 * Drivers trust SIOCSIFADDR et al to come from an already 377 * privileged layer, and do not perform any credentials 378 * checks or input validation. 379 */ 380 return (EINVAL); 381 default: 382 sa6 = NULL; 383 break; 384 } 385 if (sa6 && sa6->sin6_family == AF_INET6) { 386 if (sa6->sin6_scope_id != 0) 387 error = sa6_embedscope(sa6, 0); 388 else 389 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 390 if (error != 0) 391 return (error); 392 if (td != NULL && (error = prison_check_ip6(td->td_ucred, 393 &sa6->sin6_addr)) != 0) 394 return (error); 395 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 396 } else 397 ia = NULL; 398 399 switch (cmd) { 400 case SIOCSIFADDR_IN6: 401 case SIOCSIFDSTADDR_IN6: 402 case SIOCSIFNETMASK_IN6: 403 /* 404 * Since IPv6 allows a node to assign multiple addresses 405 * on a single interface, SIOCSIFxxx ioctls are deprecated. 406 */ 407 /* we decided to obsolete this command (20000704) */ 408 error = EINVAL; 409 goto out; 410 411 case SIOCDIFADDR_IN6: 412 /* 413 * for IPv4, we look for existing in_ifaddr here to allow 414 * "ifconfig if0 delete" to remove the first IPv4 address on 415 * the interface. For IPv6, as the spec allows multiple 416 * interface address from the day one, we consider "remove the 417 * first one" semantics to be not preferable. 418 */ 419 if (ia == NULL) { 420 error = EADDRNOTAVAIL; 421 goto out; 422 } 423 /* FALLTHROUGH */ 424 case SIOCAIFADDR_IN6: 425 /* 426 * We always require users to specify a valid IPv6 address for 427 * the corresponding operation. 428 */ 429 if (ifra->ifra_addr.sin6_family != AF_INET6 || 430 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 431 error = EAFNOSUPPORT; 432 goto out; 433 } 434 435 if (td != NULL) { 436 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 437 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR); 438 if (error) 439 goto out; 440 } 441 /* FALLTHROUGH */ 442 case SIOCGIFSTAT_IN6: 443 case SIOCGIFSTAT_ICMP6: 444 if (ifp->if_afdata[AF_INET6] == NULL) { 445 error = EPFNOSUPPORT; 446 goto out; 447 } 448 break; 449 450 case SIOCGIFADDR_IN6: 451 /* This interface is basically deprecated. use SIOCGIFCONF. */ 452 /* FALLTHROUGH */ 453 case SIOCGIFAFLAG_IN6: 454 case SIOCGIFNETMASK_IN6: 455 case SIOCGIFDSTADDR_IN6: 456 case SIOCGIFALIFETIME_IN6: 457 /* must think again about its semantics */ 458 if (ia == NULL) { 459 error = EADDRNOTAVAIL; 460 goto out; 461 } 462 break; 463 } 464 465 switch (cmd) { 466 case SIOCGIFADDR_IN6: 467 ifr->ifr_addr = ia->ia_addr; 468 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 469 goto out; 470 break; 471 472 case SIOCGIFDSTADDR_IN6: 473 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 474 error = EINVAL; 475 goto out; 476 } 477 /* 478 * XXX: should we check if ifa_dstaddr is NULL and return 479 * an error? 480 */ 481 ifr->ifr_dstaddr = ia->ia_dstaddr; 482 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 483 goto out; 484 break; 485 486 case SIOCGIFNETMASK_IN6: 487 ifr->ifr_addr = ia->ia_prefixmask; 488 break; 489 490 case SIOCGIFAFLAG_IN6: 491 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 492 break; 493 494 case SIOCGIFSTAT_IN6: 495 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 496 ifp->if_afdata[AF_INET6])->in6_ifstat, 497 &ifr->ifr_ifru.ifru_stat, 498 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 499 break; 500 501 case SIOCGIFSTAT_ICMP6: 502 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 503 ifp->if_afdata[AF_INET6])->icmp6_ifstat, 504 &ifr->ifr_ifru.ifru_icmp6stat, 505 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 506 break; 507 508 case SIOCGIFALIFETIME_IN6: 509 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 510 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 511 time_t maxexpire; 512 struct in6_addrlifetime *retlt = 513 &ifr->ifr_ifru.ifru_lifetime; 514 515 /* 516 * XXX: adjust expiration time assuming time_t is 517 * signed. 518 */ 519 maxexpire = (-1) & 520 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 521 if (ia->ia6_lifetime.ia6t_vltime < 522 maxexpire - ia->ia6_updatetime) { 523 retlt->ia6t_expire = ia->ia6_updatetime + 524 ia->ia6_lifetime.ia6t_vltime; 525 } else 526 retlt->ia6t_expire = maxexpire; 527 } 528 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 529 time_t maxexpire; 530 struct in6_addrlifetime *retlt = 531 &ifr->ifr_ifru.ifru_lifetime; 532 533 /* 534 * XXX: adjust expiration time assuming time_t is 535 * signed. 536 */ 537 maxexpire = (-1) & 538 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 539 if (ia->ia6_lifetime.ia6t_pltime < 540 maxexpire - ia->ia6_updatetime) { 541 retlt->ia6t_preferred = ia->ia6_updatetime + 542 ia->ia6_lifetime.ia6t_pltime; 543 } else 544 retlt->ia6t_preferred = maxexpire; 545 } 546 break; 547 548 case SIOCAIFADDR_IN6: 549 { 550 struct nd_prefixctl pr0; 551 struct nd_prefix *pr; 552 553 /* 554 * first, make or update the interface address structure, 555 * and link it to the list. 556 */ 557 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 558 goto out; 559 if (ia != NULL) { 560 if (ia->ia_ifa.ifa_carp) 561 (*carp_detach_p)(&ia->ia_ifa, true); 562 ifa_free(&ia->ia_ifa); 563 } 564 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 565 == NULL) { 566 /* 567 * this can happen when the user specify the 0 valid 568 * lifetime. 569 */ 570 break; 571 } 572 573 if (cmd == ocmd && ifra->ifra_vhid > 0) { 574 if (carp_attach_p != NULL) 575 error = (*carp_attach_p)(&ia->ia_ifa, 576 ifra->ifra_vhid); 577 else 578 error = EPROTONOSUPPORT; 579 if (error) 580 goto out; 581 else 582 carp_attached = 1; 583 } 584 585 /* 586 * then, make the prefix on-link on the interface. 587 * XXX: we'd rather create the prefix before the address, but 588 * we need at least one address to install the corresponding 589 * interface route, so we configure the address first. 590 */ 591 592 /* 593 * convert mask to prefix length (prefixmask has already 594 * been validated in in6_update_ifa(). 595 */ 596 bzero(&pr0, sizeof(pr0)); 597 pr0.ndpr_ifp = ifp; 598 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 599 NULL); 600 if (pr0.ndpr_plen == 128) { 601 /* we don't need to install a host route. */ 602 goto aifaddr_out; 603 } 604 pr0.ndpr_prefix = ifra->ifra_addr; 605 /* apply the mask for safety. */ 606 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, 607 &ifra->ifra_prefixmask.sin6_addr); 608 609 /* 610 * XXX: since we don't have an API to set prefix (not address) 611 * lifetimes, we just use the same lifetimes as addresses. 612 * The (temporarily) installed lifetimes can be overridden by 613 * later advertised RAs (when accept_rtadv is non 0), which is 614 * an intended behavior. 615 */ 616 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 617 pr0.ndpr_raf_auto = 618 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 619 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 620 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 621 622 /* add the prefix if not yet. */ 623 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 624 /* 625 * nd6_prelist_add will install the corresponding 626 * interface route. 627 */ 628 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) { 629 if (carp_attached) 630 (*carp_detach_p)(&ia->ia_ifa, false); 631 goto out; 632 } 633 } 634 635 /* relate the address to the prefix */ 636 if (ia->ia6_ndpr == NULL) { 637 ia->ia6_ndpr = pr; 638 pr->ndpr_addrcnt++; 639 640 /* 641 * If this is the first autoconf address from the 642 * prefix, create a temporary address as well 643 * (when required). 644 */ 645 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 646 V_ip6_use_tempaddr && pr->ndpr_addrcnt == 1) { 647 int e; 648 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 649 log(LOG_NOTICE, "in6_control: failed " 650 "to create a temporary address, " 651 "errno=%d\n", e); 652 } 653 } 654 } 655 nd6_prefix_rele(pr); 656 657 /* 658 * this might affect the status of autoconfigured addresses, 659 * that is, this address might make other addresses detached. 660 */ 661 pfxlist_onlink_check(); 662 663aifaddr_out: 664 /* 665 * Try to clear the flag when a new IPv6 address is added 666 * onto an IFDISABLED interface and it succeeds. 667 */ 668 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) { 669 struct in6_ndireq nd; 670 671 memset(&nd, 0, sizeof(nd)); 672 nd.ndi.flags = ND_IFINFO(ifp)->flags; 673 nd.ndi.flags &= ~ND6_IFF_IFDISABLED; 674 if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0) 675 log(LOG_NOTICE, "SIOCAIFADDR_IN6: " 676 "SIOCSIFINFO_FLAGS for -ifdisabled " 677 "failed."); 678 /* 679 * Ignore failure of clearing the flag intentionally. 680 * The failure means address duplication was detected. 681 */ 682 } 683 break; 684 } 685 686 case SIOCDIFADDR_IN6: 687 { 688 struct nd_prefix *pr; 689 690 /* 691 * If the address being deleted is the only one that owns 692 * the corresponding prefix, expire the prefix as well. 693 * XXX: theoretically, we don't have to worry about such 694 * relationship, since we separate the address management 695 * and the prefix management. We do this, however, to provide 696 * as much backward compatibility as possible in terms of 697 * the ioctl operation. 698 * Note that in6_purgeaddr() will decrement ndpr_addrcnt. 699 */ 700 pr = ia->ia6_ndpr; 701 in6_purgeaddr(&ia->ia_ifa); 702 if (pr != NULL && pr->ndpr_addrcnt == 0) { 703 ND6_WLOCK(); 704 nd6_prefix_unlink(pr, NULL); 705 ND6_WUNLOCK(); 706 nd6_prefix_del(pr); 707 } 708 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 709 break; 710 } 711 712 default: 713 if (ifp->if_ioctl == NULL) { 714 error = EOPNOTSUPP; 715 goto out; 716 } 717 error = (*ifp->if_ioctl)(ifp, cmd, data); 718 goto out; 719 } 720 721 error = 0; 722out: 723 if (ia != NULL) 724 ifa_free(&ia->ia_ifa); 725 return (error); 726} 727 728 729/* 730 * Join necessary multicast groups. Factored out from in6_update_ifa(). 731 * This entire work should only be done once, for the default FIB. 732 */ 733static int 734in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra, 735 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol) 736{ 737 char ip6buf[INET6_ADDRSTRLEN]; 738 struct in6_addr mltaddr; 739 struct in6_multi_mship *imm; 740 int delay, error; 741 742 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__)); 743 744 /* Join solicited multicast addr for new host id. */ 745 bzero(&mltaddr, sizeof(struct in6_addr)); 746 mltaddr.s6_addr32[0] = IPV6_ADDR_INT32_MLL; 747 mltaddr.s6_addr32[2] = htonl(1); 748 mltaddr.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 749 mltaddr.s6_addr8[12] = 0xff; 750 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) { 751 /* XXX: should not happen */ 752 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 753 goto cleanup; 754 } 755 delay = error = 0; 756 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 757 /* 758 * We need a random delay for DAD on the address being 759 * configured. It also means delaying transmission of the 760 * corresponding MLD report to avoid report collision. 761 * [RFC 4861, Section 6.3.7] 762 */ 763 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 764 } 765 imm = in6_joingroup(ifp, &mltaddr, &error, delay); 766 if (imm == NULL) { 767 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 768 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 769 if_name(ifp), error)); 770 goto cleanup; 771 } 772 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 773 *in6m_sol = imm->i6mm_maddr; 774 775 /* 776 * Join link-local all-nodes address. 777 */ 778 mltaddr = in6addr_linklocal_allnodes; 779 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 780 goto cleanup; /* XXX: should not fail */ 781 782 imm = in6_joingroup(ifp, &mltaddr, &error, 0); 783 if (imm == NULL) { 784 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 785 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 786 if_name(ifp), error)); 787 goto cleanup; 788 } 789 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 790 791 /* 792 * Join node information group address. 793 */ 794 delay = 0; 795 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 796 /* 797 * The spec does not say anything about delay for this group, 798 * but the same logic should apply. 799 */ 800 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 801 } 802 if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) { 803 /* XXX jinmei */ 804 imm = in6_joingroup(ifp, &mltaddr, &error, delay); 805 if (imm == NULL) 806 nd6log((LOG_WARNING, 807 "%s: in6_joingroup failed for %s on %s " 808 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 809 &mltaddr), if_name(ifp), error)); 810 /* XXX not very fatal, go on... */ 811 else 812 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 813 } 814 if (V_icmp6_nodeinfo_oldmcprefix && 815 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) { 816 imm = in6_joingroup(ifp, &mltaddr, &error, delay); 817 if (imm == NULL) 818 nd6log((LOG_WARNING, 819 "%s: in6_joingroup failed for %s on %s " 820 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 821 &mltaddr), if_name(ifp), error)); 822 /* XXX not very fatal, go on... */ 823 else 824 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 825 } 826 827 /* 828 * Join interface-local all-nodes address. 829 * (ff01::1%ifN, and ff01::%ifN/32) 830 */ 831 mltaddr = in6addr_nodelocal_allnodes; 832 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 833 goto cleanup; /* XXX: should not fail */ 834 835 imm = in6_joingroup(ifp, &mltaddr, &error, 0); 836 if (imm == NULL) { 837 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 838 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 839 &mltaddr), if_name(ifp), error)); 840 goto cleanup; 841 } 842 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 843 844cleanup: 845 return (error); 846} 847 848/* 849 * Update parameters of an IPv6 interface address. 850 * If necessary, a new entry is created and linked into address chains. 851 * This function is separated from in6_control(). 852 */ 853int 854in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 855 struct in6_ifaddr *ia, int flags) 856{ 857 int error, hostIsNew = 0; 858 859 if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0) 860 return (error); 861 862 if (ia == NULL) { 863 hostIsNew = 1; 864 if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL) 865 return (ENOBUFS); 866 } 867 868 error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags); 869 if (error != 0) { 870 if (hostIsNew != 0) { 871 in6_unlink_ifa(ia, ifp); 872 ifa_free(&ia->ia_ifa); 873 } 874 return (error); 875 } 876 877 if (hostIsNew) 878 error = in6_broadcast_ifa(ifp, ifra, ia, flags); 879 880 return (error); 881} 882 883/* 884 * Fill in basic IPv6 address request info. 885 */ 886void 887in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr, 888 const struct in6_addr *mask) 889{ 890 891 memset(ifra, 0, sizeof(struct in6_aliasreq)); 892 893 ifra->ifra_addr.sin6_family = AF_INET6; 894 ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 895 if (addr != NULL) 896 ifra->ifra_addr.sin6_addr = *addr; 897 898 ifra->ifra_prefixmask.sin6_family = AF_INET6; 899 ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 900 if (mask != NULL) 901 ifra->ifra_prefixmask.sin6_addr = *mask; 902} 903 904static int 905in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra, 906 struct in6_ifaddr *ia, int flags) 907{ 908 int plen = -1; 909 struct sockaddr_in6 dst6; 910 struct in6_addrlifetime *lt; 911 char ip6buf[INET6_ADDRSTRLEN]; 912 913 /* Validate parameters */ 914 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 915 return (EINVAL); 916 917 /* 918 * The destination address for a p2p link must have a family 919 * of AF_UNSPEC or AF_INET6. 920 */ 921 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 922 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 923 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 924 return (EAFNOSUPPORT); 925 926 /* 927 * Validate address 928 */ 929 if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) || 930 ifra->ifra_addr.sin6_family != AF_INET6) 931 return (EINVAL); 932 933 /* 934 * validate ifra_prefixmask. don't check sin6_family, netmask 935 * does not carry fields other than sin6_len. 936 */ 937 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 938 return (EINVAL); 939 /* 940 * Because the IPv6 address architecture is classless, we require 941 * users to specify a (non 0) prefix length (mask) for a new address. 942 * We also require the prefix (when specified) mask is valid, and thus 943 * reject a non-consecutive mask. 944 */ 945 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 946 return (EINVAL); 947 if (ifra->ifra_prefixmask.sin6_len != 0) { 948 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 949 (u_char *)&ifra->ifra_prefixmask + 950 ifra->ifra_prefixmask.sin6_len); 951 if (plen <= 0) 952 return (EINVAL); 953 } else { 954 /* 955 * In this case, ia must not be NULL. We just use its prefix 956 * length. 957 */ 958 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 959 } 960 /* 961 * If the destination address on a p2p interface is specified, 962 * and the address is a scoped one, validate/set the scope 963 * zone identifier. 964 */ 965 dst6 = ifra->ifra_dstaddr; 966 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 967 (dst6.sin6_family == AF_INET6)) { 968 struct in6_addr in6_tmp; 969 u_int32_t zoneid; 970 971 in6_tmp = dst6.sin6_addr; 972 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 973 return (EINVAL); /* XXX: should be impossible */ 974 975 if (dst6.sin6_scope_id != 0) { 976 if (dst6.sin6_scope_id != zoneid) 977 return (EINVAL); 978 } else /* user omit to specify the ID. */ 979 dst6.sin6_scope_id = zoneid; 980 981 /* convert into the internal form */ 982 if (sa6_embedscope(&dst6, 0)) 983 return (EINVAL); /* XXX: should be impossible */ 984 } 985 /* Modify original ifra_dstaddr to reflect changes */ 986 ifra->ifra_dstaddr = dst6; 987 988 /* 989 * The destination address can be specified only for a p2p or a 990 * loopback interface. If specified, the corresponding prefix length 991 * must be 128. 992 */ 993 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 994 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 995 /* XXX: noisy message */ 996 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 997 "be specified for a p2p or a loopback IF only\n")); 998 return (EINVAL); 999 } 1000 if (plen != 128) { 1001 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 1002 "be 128 when dstaddr is specified\n")); 1003 return (EINVAL); 1004 } 1005 } 1006 /* lifetime consistency check */ 1007 lt = &ifra->ifra_lifetime; 1008 if (lt->ia6t_pltime > lt->ia6t_vltime) 1009 return (EINVAL); 1010 if (lt->ia6t_vltime == 0) { 1011 /* 1012 * the following log might be noisy, but this is a typical 1013 * configuration mistake or a tool's bug. 1014 */ 1015 nd6log((LOG_INFO, 1016 "in6_update_ifa: valid lifetime is 0 for %s\n", 1017 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr))); 1018 1019 if (ia == NULL) 1020 return (0); /* there's nothing to do */ 1021 } 1022 1023 /* Check prefix mask */ 1024 if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) { 1025 /* 1026 * We prohibit changing the prefix length of an existing 1027 * address, because 1028 * + such an operation should be rare in IPv6, and 1029 * + the operation would confuse prefix management. 1030 */ 1031 if (ia->ia_prefixmask.sin6_len != 0 && 1032 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 1033 nd6log((LOG_INFO, "in6_validate_ifa: the prefix length " 1034 "of an existing %s address should not be changed\n", 1035 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1036 1037 return (EINVAL); 1038 } 1039 } 1040 1041 return (0); 1042} 1043 1044 1045/* 1046 * Allocate a new ifaddr and link it into chains. 1047 */ 1048static struct in6_ifaddr * 1049in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags) 1050{ 1051 struct in6_ifaddr *ia; 1052 1053 /* 1054 * When in6_alloc_ifa() is called in a process of a received 1055 * RA, it is called under an interrupt context. So, we should 1056 * call malloc with M_NOWAIT. 1057 */ 1058 ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT); 1059 if (ia == NULL) 1060 return (NULL); 1061 LIST_INIT(&ia->ia6_memberships); 1062 /* Initialize the address and masks, and put time stamp */ 1063 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1064 ia->ia_addr.sin6_family = AF_INET6; 1065 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 1066 /* XXX: Can we assign ,sin6_addr and skip the rest? */ 1067 ia->ia_addr = ifra->ifra_addr; 1068 ia->ia6_createtime = time_uptime; 1069 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1070 /* 1071 * Some functions expect that ifa_dstaddr is not 1072 * NULL for p2p interfaces. 1073 */ 1074 ia->ia_ifa.ifa_dstaddr = 1075 (struct sockaddr *)&ia->ia_dstaddr; 1076 } else { 1077 ia->ia_ifa.ifa_dstaddr = NULL; 1078 } 1079 1080 /* set prefix mask if any */ 1081 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 1082 if (ifra->ifra_prefixmask.sin6_len != 0) { 1083 ia->ia_prefixmask.sin6_family = AF_INET6; 1084 ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len; 1085 ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr; 1086 } 1087 1088 ia->ia_ifp = ifp; 1089 ifa_ref(&ia->ia_ifa); /* if_addrhead */ 1090 IF_ADDR_WLOCK(ifp); 1091 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1092 IF_ADDR_WUNLOCK(ifp); 1093 1094 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */ 1095 IN6_IFADDR_WLOCK(); 1096 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link); 1097 LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash); 1098 IN6_IFADDR_WUNLOCK(); 1099 1100 return (ia); 1101} 1102 1103/* 1104 * Update/configure interface address parameters: 1105 * 1106 * 1) Update lifetime 1107 * 2) Update interface metric ad flags 1108 * 3) Notify other subsystems 1109 */ 1110static int 1111in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra, 1112 struct in6_ifaddr *ia, int hostIsNew, int flags) 1113{ 1114 int error; 1115 1116 /* update timestamp */ 1117 ia->ia6_updatetime = time_uptime; 1118 1119 /* 1120 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1121 * to see if the address is deprecated or invalidated, but initialize 1122 * these members for applications. 1123 */ 1124 ia->ia6_lifetime = ifra->ifra_lifetime; 1125 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1126 ia->ia6_lifetime.ia6t_expire = 1127 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1128 } else 1129 ia->ia6_lifetime.ia6t_expire = 0; 1130 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1131 ia->ia6_lifetime.ia6t_preferred = 1132 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1133 } else 1134 ia->ia6_lifetime.ia6t_preferred = 0; 1135 1136 /* 1137 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1138 * userland, make it deprecated. 1139 */ 1140 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1141 ia->ia6_lifetime.ia6t_pltime = 0; 1142 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1143 } 1144 1145 /* 1146 * configure address flags. 1147 */ 1148 ia->ia6_flags = ifra->ifra_flags; 1149 1150 /* 1151 * Make the address tentative before joining multicast addresses, 1152 * so that corresponding MLD responses would not have a tentative 1153 * source address. 1154 */ 1155 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1156 1157 /* 1158 * DAD should be performed for an new address or addresses on 1159 * an interface with ND6_IFF_IFDISABLED. 1160 */ 1161 if (in6if_do_dad(ifp) && 1162 (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED))) 1163 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1164 1165 /* notify other subsystems */ 1166 error = in6_notify_ifa(ifp, ia, ifra, hostIsNew); 1167 1168 return (error); 1169} 1170 1171/* 1172 * Do link-level ifa job: 1173 * 1) Add lle entry for added address 1174 * 2) Notifies routing socket users about new address 1175 * 3) join appropriate multicast group 1176 * 4) start DAD if enabled 1177 */ 1178static int 1179in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1180 struct in6_ifaddr *ia, int flags) 1181{ 1182 struct in6_multi *in6m_sol; 1183 int error = 0; 1184 1185 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1186 if ((error = nd6_add_ifa_lle(ia)) != 0) { 1187 in6_purgeaddr(&ia->ia_ifa); 1188 ifa_free(&ia->ia_ifa); 1189 return (error); 1190 } 1191 1192 /* Join necessary multicast groups. */ 1193 in6m_sol = NULL; 1194 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1195 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol); 1196 if (error != 0) { 1197 in6_purgeaddr(&ia->ia_ifa); 1198 ifa_free(&ia->ia_ifa); 1199 return (error); 1200 } 1201 } 1202 1203 /* Perform DAD, if the address is TENTATIVE. */ 1204 if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) { 1205 int delay, mindelay, maxdelay; 1206 1207 delay = 0; 1208 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1209 /* 1210 * We need to impose a delay before sending an NS 1211 * for DAD. Check if we also needed a delay for the 1212 * corresponding MLD message. If we did, the delay 1213 * should be larger than the MLD delay (this could be 1214 * relaxed a bit, but this simple logic is at least 1215 * safe). 1216 * XXX: Break data hiding guidelines and look at 1217 * state for the solicited multicast group. 1218 */ 1219 mindelay = 0; 1220 if (in6m_sol != NULL && 1221 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) { 1222 mindelay = in6m_sol->in6m_timer; 1223 } 1224 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1225 if (maxdelay - mindelay == 0) 1226 delay = 0; 1227 else { 1228 delay = 1229 (arc4random() % (maxdelay - mindelay)) + 1230 mindelay; 1231 } 1232 } 1233 nd6_dad_start((struct ifaddr *)ia, delay); 1234 } 1235 1236 in6_newaddrmsg(ia, RTM_ADD); 1237 ifa_free(&ia->ia_ifa); 1238 return (error); 1239} 1240 1241void 1242in6_purgeaddr(struct ifaddr *ifa) 1243{ 1244 struct ifnet *ifp = ifa->ifa_ifp; 1245 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1246 struct in6_multi_mship *imm; 1247 int plen, error; 1248 1249 if (ifa->ifa_carp) 1250 (*carp_detach_p)(ifa, false); 1251 1252 /* 1253 * Remove the loopback route to the interface address. 1254 * The check for the current setting of "nd6_useloopback" 1255 * is not needed. 1256 */ 1257 if (ia->ia_flags & IFA_RTSELF) { 1258 error = ifa_del_loopback_route((struct ifaddr *)ia, 1259 (struct sockaddr *)&ia->ia_addr); 1260 if (error == 0) 1261 ia->ia_flags &= ~IFA_RTSELF; 1262 } 1263 1264 /* stop DAD processing */ 1265 nd6_dad_stop(ifa); 1266 1267 /* Leave multicast groups. */ 1268 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1269 LIST_REMOVE(imm, i6mm_chain); 1270 in6_leavegroup(imm); 1271 } 1272 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1273 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) { 1274 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags | 1275 (ia->ia_dstaddr.sin6_family == AF_INET6 ? RTF_HOST : 0)); 1276 if (error != 0) 1277 log(LOG_INFO, "%s: err=%d, destination address delete " 1278 "failed\n", __func__, error); 1279 ia->ia_flags &= ~IFA_ROUTE; 1280 } 1281 1282 in6_newaddrmsg(ia, RTM_DELETE); 1283 in6_unlink_ifa(ia, ifp); 1284} 1285 1286static void 1287in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1288{ 1289 char ip6buf[INET6_ADDRSTRLEN]; 1290 int remove_lle; 1291 1292 IF_ADDR_WLOCK(ifp); 1293 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1294 IF_ADDR_WUNLOCK(ifp); 1295 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1296 1297 /* 1298 * Defer the release of what might be the last reference to the 1299 * in6_ifaddr so that it can't be freed before the remainder of the 1300 * cleanup. 1301 */ 1302 IN6_IFADDR_WLOCK(); 1303 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 1304 LIST_REMOVE(ia, ia6_hash); 1305 IN6_IFADDR_WUNLOCK(); 1306 1307 /* 1308 * Release the reference to the base prefix. There should be a 1309 * positive reference. 1310 */ 1311 remove_lle = 0; 1312 if (ia->ia6_ndpr == NULL) { 1313 nd6log((LOG_NOTICE, 1314 "in6_unlink_ifa: autoconf'ed address " 1315 "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia)))); 1316 } else { 1317 ia->ia6_ndpr->ndpr_addrcnt--; 1318 /* Do not delete lles within prefix if refcont != 0 */ 1319 if (ia->ia6_ndpr->ndpr_addrcnt == 0) 1320 remove_lle = 1; 1321 ia->ia6_ndpr = NULL; 1322 } 1323 1324 nd6_rem_ifa_lle(ia, remove_lle); 1325 1326 /* 1327 * Also, if the address being removed is autoconf'ed, call 1328 * pfxlist_onlink_check() since the release might affect the status of 1329 * other (detached) addresses. 1330 */ 1331 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1332 pfxlist_onlink_check(); 1333 } 1334 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1335} 1336 1337/* 1338 * Notifies other subsystems about address change/arrival: 1339 * 1) Notifies device handler on the first IPv6 address assignment 1340 * 2) Handle routing table changes for P2P links and route 1341 * 3) Handle routing table changes for address host route 1342 */ 1343static int 1344in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia, 1345 struct in6_aliasreq *ifra, int hostIsNew) 1346{ 1347 int error = 0, plen, ifacount = 0; 1348 struct ifaddr *ifa; 1349 struct sockaddr_in6 *pdst; 1350 char ip6buf[INET6_ADDRSTRLEN]; 1351 1352 /* 1353 * Give the interface a chance to initialize 1354 * if this is its first address, 1355 */ 1356 if (hostIsNew != 0) { 1357 IF_ADDR_RLOCK(ifp); 1358 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1359 if (ifa->ifa_addr->sa_family != AF_INET6) 1360 continue; 1361 ifacount++; 1362 } 1363 IF_ADDR_RUNLOCK(ifp); 1364 } 1365 1366 if (ifacount <= 1 && ifp->if_ioctl) { 1367 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1368 if (error) 1369 goto done; 1370 } 1371 1372 /* 1373 * If a new destination address is specified, scrub the old one and 1374 * install the new destination. Note that the interface must be 1375 * p2p or loopback. 1376 */ 1377 pdst = &ifra->ifra_dstaddr; 1378 if (pdst->sin6_family == AF_INET6 && 1379 !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1380 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1381 (rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0)) { 1382 nd6log((LOG_ERR, "in6_update_ifa_internal: failed to " 1383 "remove a route to the old destination: %s\n", 1384 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1385 /* proceed anyway... */ 1386 } else 1387 ia->ia_flags &= ~IFA_ROUTE; 1388 ia->ia_dstaddr = *pdst; 1389 } 1390 1391 /* 1392 * If a new destination address is specified for a point-to-point 1393 * interface, install a route to the destination as an interface 1394 * direct route. 1395 * XXX: the logic below rejects assigning multiple addresses on a p2p 1396 * interface that share the same destination. 1397 */ 1398 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1399 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 && 1400 ia->ia_dstaddr.sin6_family == AF_INET6) { 1401 int rtflags = RTF_UP | RTF_HOST; 1402 /* 1403 * Handle the case for ::1 . 1404 */ 1405 if (ifp->if_flags & IFF_LOOPBACK) 1406 ia->ia_flags |= IFA_RTSELF; 1407 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags); 1408 if (error) 1409 goto done; 1410 ia->ia_flags |= IFA_ROUTE; 1411 } 1412 1413 /* 1414 * add a loopback route to self if not exists 1415 */ 1416 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) { 1417 error = ifa_add_loopback_route((struct ifaddr *)ia, 1418 (struct sockaddr *)&ia->ia_addr); 1419 if (error == 0) 1420 ia->ia_flags |= IFA_RTSELF; 1421 } 1422done: 1423 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 1424 "Invoking IPv6 network device address event may sleep"); 1425 1426 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 1427 1428 return (error); 1429} 1430 1431/* 1432 * Find an IPv6 interface link-local address specific to an interface. 1433 * ifaddr is returned referenced. 1434 */ 1435struct in6_ifaddr * 1436in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1437{ 1438 struct ifaddr *ifa; 1439 1440 IF_ADDR_RLOCK(ifp); 1441 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1442 if (ifa->ifa_addr->sa_family != AF_INET6) 1443 continue; 1444 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1445 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1446 ignoreflags) != 0) 1447 continue; 1448 ifa_ref(ifa); 1449 break; 1450 } 1451 } 1452 IF_ADDR_RUNLOCK(ifp); 1453 1454 return ((struct in6_ifaddr *)ifa); 1455} 1456 1457 1458/* 1459 * find the interface address corresponding to a given IPv6 address. 1460 * ifaddr is returned referenced. 1461 */ 1462struct in6_ifaddr * 1463in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid) 1464{ 1465 struct rm_priotracker in6_ifa_tracker; 1466 struct in6_ifaddr *ia; 1467 1468 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1469 LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) { 1470 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1471 if (zoneid != 0 && 1472 zoneid != ia->ia_addr.sin6_scope_id) 1473 continue; 1474 ifa_ref(&ia->ia_ifa); 1475 break; 1476 } 1477 } 1478 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1479 return (ia); 1480} 1481 1482/* 1483 * find the internet address corresponding to a given interface and address. 1484 * ifaddr is returned referenced. 1485 */ 1486struct in6_ifaddr * 1487in6ifa_ifpwithaddr(struct ifnet *ifp, const struct in6_addr *addr) 1488{ 1489 struct ifaddr *ifa; 1490 1491 IF_ADDR_RLOCK(ifp); 1492 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1493 if (ifa->ifa_addr->sa_family != AF_INET6) 1494 continue; 1495 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1496 ifa_ref(ifa); 1497 break; 1498 } 1499 } 1500 IF_ADDR_RUNLOCK(ifp); 1501 1502 return ((struct in6_ifaddr *)ifa); 1503} 1504 1505/* 1506 * Find a link-local scoped address on ifp and return it if any. 1507 */ 1508struct in6_ifaddr * 1509in6ifa_llaonifp(struct ifnet *ifp) 1510{ 1511 struct sockaddr_in6 *sin6; 1512 struct ifaddr *ifa; 1513 1514 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1515 return (NULL); 1516 IF_ADDR_RLOCK(ifp); 1517 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1518 if (ifa->ifa_addr->sa_family != AF_INET6) 1519 continue; 1520 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 1521 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 1522 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) || 1523 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr)) 1524 break; 1525 } 1526 IF_ADDR_RUNLOCK(ifp); 1527 1528 return ((struct in6_ifaddr *)ifa); 1529} 1530 1531/* 1532 * Convert IP6 address to printable (loggable) representation. Caller 1533 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 1534 */ 1535static char digits[] = "0123456789abcdef"; 1536char * 1537ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 1538{ 1539 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0; 1540 char *cp; 1541 const u_int16_t *a = (const u_int16_t *)addr; 1542 const u_int8_t *d; 1543 int dcolon = 0, zero = 0; 1544 1545 cp = ip6buf; 1546 1547 for (i = 0; i < 8; i++) { 1548 if (*(a + i) == 0) { 1549 cnt++; 1550 if (cnt == 1) 1551 idx = i; 1552 } 1553 else if (maxcnt < cnt) { 1554 maxcnt = cnt; 1555 index = idx; 1556 cnt = 0; 1557 } 1558 } 1559 if (maxcnt < cnt) { 1560 maxcnt = cnt; 1561 index = idx; 1562 } 1563 1564 for (i = 0; i < 8; i++) { 1565 if (dcolon == 1) { 1566 if (*a == 0) { 1567 if (i == 7) 1568 *cp++ = ':'; 1569 a++; 1570 continue; 1571 } else 1572 dcolon = 2; 1573 } 1574 if (*a == 0) { 1575 if (dcolon == 0 && *(a + 1) == 0 && i == index) { 1576 if (i == 0) 1577 *cp++ = ':'; 1578 *cp++ = ':'; 1579 dcolon = 1; 1580 } else { 1581 *cp++ = '0'; 1582 *cp++ = ':'; 1583 } 1584 a++; 1585 continue; 1586 } 1587 d = (const u_char *)a; 1588 /* Try to eliminate leading zeros in printout like in :0001. */ 1589 zero = 1; 1590 *cp = digits[*d >> 4]; 1591 if (*cp != '0') { 1592 zero = 0; 1593 cp++; 1594 } 1595 *cp = digits[*d++ & 0xf]; 1596 if (zero == 0 || (*cp != '0')) { 1597 zero = 0; 1598 cp++; 1599 } 1600 *cp = digits[*d >> 4]; 1601 if (zero == 0 || (*cp != '0')) { 1602 zero = 0; 1603 cp++; 1604 } 1605 *cp++ = digits[*d & 0xf]; 1606 *cp++ = ':'; 1607 a++; 1608 } 1609 *--cp = '\0'; 1610 return (ip6buf); 1611} 1612 1613int 1614in6_localaddr(struct in6_addr *in6) 1615{ 1616 struct rm_priotracker in6_ifa_tracker; 1617 struct in6_ifaddr *ia; 1618 1619 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1620 return 1; 1621 1622 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1623 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 1624 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1625 &ia->ia_prefixmask.sin6_addr)) { 1626 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1627 return 1; 1628 } 1629 } 1630 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1631 1632 return (0); 1633} 1634 1635/* 1636 * Return 1 if an internet address is for the local host and configured 1637 * on one of its interfaces. 1638 */ 1639int 1640in6_localip(struct in6_addr *in6) 1641{ 1642 struct rm_priotracker in6_ifa_tracker; 1643 struct in6_ifaddr *ia; 1644 1645 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1646 LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 1647 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) { 1648 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1649 return (1); 1650 } 1651 } 1652 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1653 return (0); 1654} 1655 1656/* 1657 * Return 1 if an internet address is configured on an interface. 1658 */ 1659int 1660in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr) 1661{ 1662 struct in6_addr in6; 1663 struct ifaddr *ifa; 1664 struct in6_ifaddr *ia6; 1665 1666 in6 = *addr; 1667 if (in6_clearscope(&in6)) 1668 return (0); 1669 in6_setscope(&in6, ifp, NULL); 1670 1671 IF_ADDR_RLOCK(ifp); 1672 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1673 if (ifa->ifa_addr->sa_family != AF_INET6) 1674 continue; 1675 ia6 = (struct in6_ifaddr *)ifa; 1676 if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) { 1677 IF_ADDR_RUNLOCK(ifp); 1678 return (1); 1679 } 1680 } 1681 IF_ADDR_RUNLOCK(ifp); 1682 1683 return (0); 1684} 1685 1686int 1687in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1688{ 1689 struct rm_priotracker in6_ifa_tracker; 1690 struct in6_ifaddr *ia; 1691 1692 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1693 LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) { 1694 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) { 1695 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 1696 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1697 return (1); /* true */ 1698 } 1699 break; 1700 } 1701 } 1702 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1703 1704 return (0); /* false */ 1705} 1706 1707/* 1708 * return length of part which dst and src are equal 1709 * hard coding... 1710 */ 1711int 1712in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1713{ 1714 int match = 0; 1715 u_char *s = (u_char *)src, *d = (u_char *)dst; 1716 u_char *lim = s + 16, r; 1717 1718 while (s < lim) 1719 if ((r = (*d++ ^ *s++)) != 0) { 1720 while (r < 128) { 1721 match++; 1722 r <<= 1; 1723 } 1724 break; 1725 } else 1726 match += 8; 1727 return match; 1728} 1729 1730/* XXX: to be scope conscious */ 1731int 1732in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1733{ 1734 int bytelen, bitlen; 1735 1736 /* sanity check */ 1737 if (0 > len || len > 128) { 1738 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1739 len); 1740 return (0); 1741 } 1742 1743 bytelen = len / 8; 1744 bitlen = len % 8; 1745 1746 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1747 return (0); 1748 if (bitlen != 0 && 1749 p1->s6_addr[bytelen] >> (8 - bitlen) != 1750 p2->s6_addr[bytelen] >> (8 - bitlen)) 1751 return (0); 1752 1753 return (1); 1754} 1755 1756void 1757in6_prefixlen2mask(struct in6_addr *maskp, int len) 1758{ 1759 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1760 int bytelen, bitlen, i; 1761 1762 /* sanity check */ 1763 if (0 > len || len > 128) { 1764 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1765 len); 1766 return; 1767 } 1768 1769 bzero(maskp, sizeof(*maskp)); 1770 bytelen = len / 8; 1771 bitlen = len % 8; 1772 for (i = 0; i < bytelen; i++) 1773 maskp->s6_addr[i] = 0xff; 1774 if (bitlen) 1775 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1776} 1777 1778/* 1779 * return the best address out of the same scope. if no address was 1780 * found, return the first valid address from designated IF. 1781 */ 1782struct in6_ifaddr * 1783in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 1784{ 1785 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 1786 struct ifaddr *ifa; 1787 struct in6_ifaddr *besta = NULL; 1788 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 1789 1790 dep[0] = dep[1] = NULL; 1791 1792 /* 1793 * We first look for addresses in the same scope. 1794 * If there is one, return it. 1795 * If two or more, return one which matches the dst longest. 1796 * If none, return one of global addresses assigned other ifs. 1797 */ 1798 IF_ADDR_RLOCK(ifp); 1799 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1800 if (ifa->ifa_addr->sa_family != AF_INET6) 1801 continue; 1802 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1803 continue; /* XXX: is there any case to allow anycast? */ 1804 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1805 continue; /* don't use this interface */ 1806 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1807 continue; 1808 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1809 if (V_ip6_use_deprecated) 1810 dep[0] = (struct in6_ifaddr *)ifa; 1811 continue; 1812 } 1813 1814 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 1815 /* 1816 * call in6_matchlen() as few as possible 1817 */ 1818 if (besta) { 1819 if (blen == -1) 1820 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 1821 tlen = in6_matchlen(IFA_IN6(ifa), dst); 1822 if (tlen > blen) { 1823 blen = tlen; 1824 besta = (struct in6_ifaddr *)ifa; 1825 } 1826 } else 1827 besta = (struct in6_ifaddr *)ifa; 1828 } 1829 } 1830 if (besta) { 1831 ifa_ref(&besta->ia_ifa); 1832 IF_ADDR_RUNLOCK(ifp); 1833 return (besta); 1834 } 1835 1836 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1837 if (ifa->ifa_addr->sa_family != AF_INET6) 1838 continue; 1839 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1840 continue; /* XXX: is there any case to allow anycast? */ 1841 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1842 continue; /* don't use this interface */ 1843 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1844 continue; 1845 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1846 if (V_ip6_use_deprecated) 1847 dep[1] = (struct in6_ifaddr *)ifa; 1848 continue; 1849 } 1850 1851 if (ifa != NULL) 1852 ifa_ref(ifa); 1853 IF_ADDR_RUNLOCK(ifp); 1854 return (struct in6_ifaddr *)ifa; 1855 } 1856 1857 /* use the last-resort values, that are, deprecated addresses */ 1858 if (dep[0]) { 1859 ifa_ref((struct ifaddr *)dep[0]); 1860 IF_ADDR_RUNLOCK(ifp); 1861 return dep[0]; 1862 } 1863 if (dep[1]) { 1864 ifa_ref((struct ifaddr *)dep[1]); 1865 IF_ADDR_RUNLOCK(ifp); 1866 return dep[1]; 1867 } 1868 1869 IF_ADDR_RUNLOCK(ifp); 1870 return NULL; 1871} 1872 1873/* 1874 * perform DAD when interface becomes IFF_UP. 1875 */ 1876void 1877in6_if_up(struct ifnet *ifp) 1878{ 1879 struct ifaddr *ifa; 1880 struct in6_ifaddr *ia; 1881 1882 IF_ADDR_RLOCK(ifp); 1883 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1884 if (ifa->ifa_addr->sa_family != AF_INET6) 1885 continue; 1886 ia = (struct in6_ifaddr *)ifa; 1887 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 1888 /* 1889 * The TENTATIVE flag was likely set by hand 1890 * beforehand, implicitly indicating the need for DAD. 1891 * We may be able to skip the random delay in this 1892 * case, but we impose delays just in case. 1893 */ 1894 nd6_dad_start(ifa, 1895 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 1896 } 1897 } 1898 IF_ADDR_RUNLOCK(ifp); 1899 1900 /* 1901 * special cases, like 6to4, are handled in in6_ifattach 1902 */ 1903 in6_ifattach(ifp, NULL); 1904} 1905 1906int 1907in6if_do_dad(struct ifnet *ifp) 1908{ 1909 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 1910 return (0); 1911 1912 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) || 1913 (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD)) 1914 return (0); 1915 1916 /* 1917 * Our DAD routine requires the interface up and running. 1918 * However, some interfaces can be up before the RUNNING 1919 * status. Additionally, users may try to assign addresses 1920 * before the interface becomes up (or running). 1921 * This function returns EAGAIN in that case. 1922 * The caller should mark "tentative" on the address instead of 1923 * performing DAD immediately. 1924 */ 1925 if (!((ifp->if_flags & IFF_UP) && 1926 (ifp->if_drv_flags & IFF_DRV_RUNNING))) 1927 return (EAGAIN); 1928 1929 return (1); 1930} 1931 1932/* 1933 * Calculate max IPv6 MTU through all the interfaces and store it 1934 * to in6_maxmtu. 1935 */ 1936void 1937in6_setmaxmtu(void) 1938{ 1939 unsigned long maxmtu = 0; 1940 struct ifnet *ifp; 1941 1942 IFNET_RLOCK_NOSLEEP(); 1943 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1944 /* this function can be called during ifnet initialization */ 1945 if (!ifp->if_afdata[AF_INET6]) 1946 continue; 1947 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 1948 IN6_LINKMTU(ifp) > maxmtu) 1949 maxmtu = IN6_LINKMTU(ifp); 1950 } 1951 IFNET_RUNLOCK_NOSLEEP(); 1952 if (maxmtu) /* update only when maxmtu is positive */ 1953 V_in6_maxmtu = maxmtu; 1954} 1955 1956/* 1957 * Provide the length of interface identifiers to be used for the link attached 1958 * to the given interface. The length should be defined in "IPv6 over 1959 * xxx-link" document. Note that address architecture might also define 1960 * the length for a particular set of address prefixes, regardless of the 1961 * link type. As clarified in rfc2462bis, those two definitions should be 1962 * consistent, and those really are as of August 2004. 1963 */ 1964int 1965in6_if2idlen(struct ifnet *ifp) 1966{ 1967 switch (ifp->if_type) { 1968 case IFT_ETHER: /* RFC2464 */ 1969 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 1970 case IFT_L2VLAN: /* ditto */ 1971 case IFT_IEEE80211: /* ditto */ 1972 case IFT_BRIDGE: /* bridge(4) only does Ethernet-like links */ 1973 case IFT_INFINIBAND: 1974 return (64); 1975 case IFT_FDDI: /* RFC2467 */ 1976 return (64); 1977 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 1978 return (64); 1979 case IFT_PPP: /* RFC2472 */ 1980 return (64); 1981 case IFT_ARCNET: /* RFC2497 */ 1982 return (64); 1983 case IFT_FRELAY: /* RFC2590 */ 1984 return (64); 1985 case IFT_IEEE1394: /* RFC3146 */ 1986 return (64); 1987 case IFT_GIF: 1988 return (64); /* draft-ietf-v6ops-mech-v2-07 */ 1989 case IFT_LOOP: 1990 return (64); /* XXX: is this really correct? */ 1991 default: 1992 /* 1993 * Unknown link type: 1994 * It might be controversial to use the today's common constant 1995 * of 64 for these cases unconditionally. For full compliance, 1996 * we should return an error in this case. On the other hand, 1997 * if we simply miss the standard for the link type or a new 1998 * standard is defined for a new link type, the IFID length 1999 * is very likely to be the common constant. As a compromise, 2000 * we always use the constant, but make an explicit notice 2001 * indicating the "unknown" case. 2002 */ 2003 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2004 return (64); 2005 } 2006} 2007 2008#include <sys/sysctl.h> 2009 2010struct in6_llentry { 2011 struct llentry base; 2012}; 2013 2014#define IN6_LLTBL_DEFAULT_HSIZE 32 2015#define IN6_LLTBL_HASH(k, h) \ 2016 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 2017 2018/* 2019 * Do actual deallocation of @lle. 2020 */ 2021static void 2022in6_lltable_destroy_lle_unlocked(struct llentry *lle) 2023{ 2024 2025 LLE_LOCK_DESTROY(lle); 2026 LLE_REQ_DESTROY(lle); 2027 free(lle, M_LLTABLE); 2028} 2029 2030/* 2031 * Called by LLE_FREE_LOCKED when number of references 2032 * drops to zero. 2033 */ 2034static void 2035in6_lltable_destroy_lle(struct llentry *lle) 2036{ 2037 2038 LLE_WUNLOCK(lle); 2039 in6_lltable_destroy_lle_unlocked(lle); 2040} 2041 2042static struct llentry * 2043in6_lltable_new(const struct in6_addr *addr6, u_int flags) 2044{ 2045 struct in6_llentry *lle; 2046 2047 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 2048 if (lle == NULL) /* NB: caller generates msg */ 2049 return NULL; 2050 2051 lle->base.r_l3addr.addr6 = *addr6; 2052 lle->base.lle_refcnt = 1; 2053 lle->base.lle_free = in6_lltable_destroy_lle; 2054 LLE_LOCK_INIT(&lle->base); 2055 LLE_REQ_INIT(&lle->base); 2056 callout_init(&lle->base.lle_timer, 1); 2057 2058 return (&lle->base); 2059} 2060 2061static int 2062in6_lltable_match_prefix(const struct sockaddr *saddr, 2063 const struct sockaddr *smask, u_int flags, struct llentry *lle) 2064{ 2065 const struct in6_addr *addr, *mask, *lle_addr; 2066 2067 addr = &((const struct sockaddr_in6 *)saddr)->sin6_addr; 2068 mask = &((const struct sockaddr_in6 *)smask)->sin6_addr; 2069 lle_addr = &lle->r_l3addr.addr6; 2070 2071 if (IN6_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0) 2072 return (0); 2073 2074 if (lle->la_flags & LLE_IFADDR) { 2075 2076 /* 2077 * Delete LLE_IFADDR records IFF address & flag matches. 2078 * Note that addr is the interface address within prefix 2079 * being matched. 2080 */ 2081 if (IN6_ARE_ADDR_EQUAL(addr, lle_addr) && 2082 (flags & LLE_STATIC) != 0) 2083 return (1); 2084 return (0); 2085 } 2086 2087 /* flags & LLE_STATIC means deleting both dynamic and static entries */ 2088 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC)) 2089 return (1); 2090 2091 return (0); 2092} 2093 2094static void 2095in6_lltable_free_entry(struct lltable *llt, struct llentry *lle) 2096{ 2097 struct ifnet *ifp; 2098 2099 LLE_WLOCK_ASSERT(lle); 2100 KASSERT(llt != NULL, ("lltable is NULL")); 2101 2102 /* Unlink entry from table */ 2103 if ((lle->la_flags & LLE_LINKED) != 0) { 2104 2105 ifp = llt->llt_ifp; 2106 IF_AFDATA_WLOCK_ASSERT(ifp); 2107 lltable_unlink_entry(llt, lle); 2108 } 2109 2110 llentry_free(lle); 2111} 2112 2113static int 2114in6_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/* 2152 * Called by the datapath to indicate that the entry was used. 2153 */ 2154static void 2155in6_lltable_mark_used(struct llentry *lle) 2156{ 2157 2158 LLE_REQ_LOCK(lle); 2159 lle->r_skip_req = 0; 2160 2161 /* 2162 * Set the hit time so the callback function 2163 * can determine the remaining time before 2164 * transiting to the DELAY state. 2165 */ 2166 lle->lle_hittime = time_uptime; 2167 LLE_REQ_UNLOCK(lle); 2168} 2169 2170static inline uint32_t 2171in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize) 2172{ 2173 2174 return (IN6_LLTBL_HASH(dst->s6_addr32[3], hsize)); 2175} 2176 2177static uint32_t 2178in6_lltable_hash(const struct llentry *lle, uint32_t hsize) 2179{ 2180 2181 return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize)); 2182} 2183 2184static void 2185in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 2186{ 2187 struct sockaddr_in6 *sin6; 2188 2189 sin6 = (struct sockaddr_in6 *)sa; 2190 bzero(sin6, sizeof(*sin6)); 2191 sin6->sin6_family = AF_INET6; 2192 sin6->sin6_len = sizeof(*sin6); 2193 sin6->sin6_addr = lle->r_l3addr.addr6; 2194} 2195 2196static inline struct llentry * 2197in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst) 2198{ 2199 struct llentry *lle; 2200 struct llentries *lleh; 2201 u_int hashidx; 2202 2203 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize); 2204 lleh = &llt->lle_head[hashidx]; 2205 LIST_FOREACH(lle, lleh, lle_next) { 2206 if (lle->la_flags & LLE_DELETED) 2207 continue; 2208 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst)) 2209 break; 2210 } 2211 2212 return (lle); 2213} 2214 2215static void 2216in6_lltable_delete_entry(struct lltable *llt, struct llentry *lle) 2217{ 2218 2219 lle->la_flags |= LLE_DELETED; 2220 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 2221#ifdef DIAGNOSTIC 2222 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2223#endif 2224 llentry_free(lle); 2225} 2226 2227static struct llentry * 2228in6_lltable_alloc(struct lltable *llt, u_int flags, 2229 const struct sockaddr *l3addr) 2230{ 2231 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2232 struct ifnet *ifp = llt->llt_ifp; 2233 struct llentry *lle; 2234 char linkhdr[LLE_MAX_LINKHDR]; 2235 size_t linkhdrsize; 2236 int lladdr_off; 2237 2238 KASSERT(l3addr->sa_family == AF_INET6, 2239 ("sin_family %d", l3addr->sa_family)); 2240 2241 /* 2242 * A route that covers the given address must have 2243 * been installed 1st because we are doing a resolution, 2244 * verify this. 2245 */ 2246 if (!(flags & LLE_IFADDR) && 2247 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2248 return (NULL); 2249 2250 lle = in6_lltable_new(&sin6->sin6_addr, flags); 2251 if (lle == NULL) { 2252 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2253 return (NULL); 2254 } 2255 lle->la_flags = flags; 2256 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 2257 linkhdrsize = LLE_MAX_LINKHDR; 2258 if (lltable_calc_llheader(ifp, AF_INET6, IF_LLADDR(ifp), 2259 linkhdr, &linkhdrsize, &lladdr_off) != 0) { 2260 in6_lltable_destroy_lle_unlocked(lle); 2261 return (NULL); 2262 } 2263 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize, 2264 lladdr_off); 2265 lle->la_flags |= LLE_STATIC; 2266 } 2267 2268 if ((lle->la_flags & LLE_STATIC) != 0) 2269 lle->ln_state = ND6_LLINFO_REACHABLE; 2270 2271 return (lle); 2272} 2273 2274static struct llentry * 2275in6_lltable_lookup(struct lltable *llt, u_int flags, 2276 const struct sockaddr *l3addr) 2277{ 2278 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2279 struct llentry *lle; 2280 2281 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 2282 KASSERT(l3addr->sa_family == AF_INET6, 2283 ("sin_family %d", l3addr->sa_family)); 2284 2285 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2286 2287 if (lle == NULL) 2288 return (NULL); 2289 2290 KASSERT((flags & (LLE_UNLOCKED|LLE_EXCLUSIVE)) != 2291 (LLE_UNLOCKED|LLE_EXCLUSIVE),("wrong lle request flags: 0x%X", 2292 flags)); 2293 2294 if (flags & LLE_UNLOCKED) 2295 return (lle); 2296 2297 if (flags & LLE_EXCLUSIVE) 2298 LLE_WLOCK(lle); 2299 else 2300 LLE_RLOCK(lle); 2301 return (lle); 2302} 2303 2304static int 2305in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 2306 struct sysctl_req *wr) 2307{ 2308 struct ifnet *ifp = llt->llt_ifp; 2309 /* XXX stack use */ 2310 struct { 2311 struct rt_msghdr rtm; 2312 struct sockaddr_in6 sin6; 2313 /* 2314 * ndp.c assumes that sdl is word aligned 2315 */ 2316#ifdef __LP64__ 2317 uint32_t pad; 2318#endif 2319 struct sockaddr_dl sdl; 2320 } ndpc; 2321 struct sockaddr_dl *sdl; 2322 int error; 2323 2324 bzero(&ndpc, sizeof(ndpc)); 2325 /* skip deleted entries */ 2326 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 2327 return (0); 2328 /* Skip if jailed and not a valid IP of the prison. */ 2329 lltable_fill_sa_entry(lle, 2330 (struct sockaddr *)&ndpc.sin6); 2331 if (prison_if(wr->td->td_ucred, 2332 (struct sockaddr *)&ndpc.sin6) != 0) 2333 return (0); 2334 /* 2335 * produce a msg made of: 2336 * struct rt_msghdr; 2337 * struct sockaddr_in6 (IPv6) 2338 * struct sockaddr_dl; 2339 */ 2340 ndpc.rtm.rtm_msglen = sizeof(ndpc); 2341 ndpc.rtm.rtm_version = RTM_VERSION; 2342 ndpc.rtm.rtm_type = RTM_GET; 2343 ndpc.rtm.rtm_flags = RTF_UP; 2344 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 2345 if (V_deembed_scopeid) 2346 sa6_recoverscope(&ndpc.sin6); 2347 2348 /* publish */ 2349 if (lle->la_flags & LLE_PUB) 2350 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE; 2351 2352 sdl = &ndpc.sdl; 2353 sdl->sdl_family = AF_LINK; 2354 sdl->sdl_len = sizeof(*sdl); 2355 sdl->sdl_index = ifp->if_index; 2356 sdl->sdl_type = ifp->if_type; 2357 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 2358 sdl->sdl_alen = ifp->if_addrlen; 2359 bcopy(lle->ll_addr, LLADDR(sdl), 2360 ifp->if_addrlen); 2361 } else { 2362 sdl->sdl_alen = 0; 2363 bzero(LLADDR(sdl), ifp->if_addrlen); 2364 } 2365 if (lle->la_expire != 0) 2366 ndpc.rtm.rtm_rmx.rmx_expire = lle->la_expire + 2367 lle->lle_remtime / hz + 2368 time_second - time_uptime; 2369 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 2370 if (lle->la_flags & LLE_STATIC) 2371 ndpc.rtm.rtm_flags |= RTF_STATIC; 2372 if (lle->la_flags & LLE_IFADDR) 2373 ndpc.rtm.rtm_flags |= RTF_PINNED; 2374 if (lle->ln_router != 0) 2375 ndpc.rtm.rtm_flags |= RTF_GATEWAY; 2376 ndpc.rtm.rtm_rmx.rmx_pksent = lle->la_asked; 2377 /* Store state in rmx_weight value */ 2378 ndpc.rtm.rtm_rmx.rmx_state = lle->ln_state; 2379 ndpc.rtm.rtm_index = ifp->if_index; 2380 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc)); 2381 2382 return (error); 2383} 2384 2385static struct lltable * 2386in6_lltattach(struct ifnet *ifp) 2387{ 2388 struct lltable *llt; 2389 2390 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE); 2391 llt->llt_af = AF_INET6; 2392 llt->llt_ifp = ifp; 2393 2394 llt->llt_lookup = in6_lltable_lookup; 2395 llt->llt_alloc_entry = in6_lltable_alloc; 2396 llt->llt_delete_entry = in6_lltable_delete_entry; 2397 llt->llt_dump_entry = in6_lltable_dump_entry; 2398 llt->llt_hash = in6_lltable_hash; 2399 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry; 2400 llt->llt_free_entry = in6_lltable_free_entry; 2401 llt->llt_match_prefix = in6_lltable_match_prefix; 2402 llt->llt_mark_used = in6_lltable_mark_used; 2403 lltable_link(llt); 2404 2405 return (llt); 2406} 2407 2408void * 2409in6_domifattach(struct ifnet *ifp) 2410{ 2411 struct in6_ifextra *ext; 2412 2413 /* There are not IPv6-capable interfaces. */ 2414 switch (ifp->if_type) { 2415 case IFT_PFLOG: 2416 case IFT_PFSYNC: 2417 case IFT_USB: 2418 return (NULL); 2419 } 2420 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2421 bzero(ext, sizeof(*ext)); 2422 2423 ext->in6_ifstat = malloc(sizeof(counter_u64_t) * 2424 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK); 2425 COUNTER_ARRAY_ALLOC(ext->in6_ifstat, 2426 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK); 2427 2428 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) * 2429 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR, 2430 M_WAITOK); 2431 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat, 2432 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK); 2433 2434 ext->nd_ifinfo = nd6_ifattach(ifp); 2435 ext->scope6_id = scope6_ifattach(ifp); 2436 ext->lltable = in6_lltattach(ifp); 2437 2438 ext->mld_ifinfo = mld_domifattach(ifp); 2439 2440 return ext; 2441} 2442 2443int 2444in6_domifmtu(struct ifnet *ifp) 2445{ 2446 if (ifp->if_afdata[AF_INET6] == NULL) 2447 return ifp->if_mtu; 2448 2449 return (IN6_LINKMTU(ifp)); 2450} 2451 2452void 2453in6_domifdetach(struct ifnet *ifp, void *aux) 2454{ 2455 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2456 2457 mld_domifdetach(ifp); 2458 scope6_ifdetach(ext->scope6_id); 2459 nd6_ifdetach(ifp, ext->nd_ifinfo); 2460 lltable_free(ext->lltable); 2461 COUNTER_ARRAY_FREE(ext->in6_ifstat, 2462 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 2463 free(ext->in6_ifstat, M_IFADDR); 2464 COUNTER_ARRAY_FREE(ext->icmp6_ifstat, 2465 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 2466 free(ext->icmp6_ifstat, M_IFADDR); 2467 free(ext, M_IFADDR); 2468} 2469 2470/* 2471 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2472 * v4 mapped addr or v4 compat addr 2473 */ 2474void 2475in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2476{ 2477 2478 bzero(sin, sizeof(*sin)); 2479 sin->sin_len = sizeof(struct sockaddr_in); 2480 sin->sin_family = AF_INET; 2481 sin->sin_port = sin6->sin6_port; 2482 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2483} 2484 2485/* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2486void 2487in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2488{ 2489 bzero(sin6, sizeof(*sin6)); 2490 sin6->sin6_len = sizeof(struct sockaddr_in6); 2491 sin6->sin6_family = AF_INET6; 2492 sin6->sin6_port = sin->sin_port; 2493 sin6->sin6_addr.s6_addr32[0] = 0; 2494 sin6->sin6_addr.s6_addr32[1] = 0; 2495 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2496 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2497} 2498 2499/* Convert sockaddr_in6 into sockaddr_in. */ 2500void 2501in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2502{ 2503 struct sockaddr_in *sin_p; 2504 struct sockaddr_in6 sin6; 2505 2506 /* 2507 * Save original sockaddr_in6 addr and convert it 2508 * to sockaddr_in. 2509 */ 2510 sin6 = *(struct sockaddr_in6 *)nam; 2511 sin_p = (struct sockaddr_in *)nam; 2512 in6_sin6_2_sin(sin_p, &sin6); 2513} 2514 2515/* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2516void 2517in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2518{ 2519 struct sockaddr_in *sin_p; 2520 struct sockaddr_in6 *sin6_p; 2521 2522 sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK); 2523 sin_p = (struct sockaddr_in *)*nam; 2524 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2525 free(*nam, M_SONAME); 2526 *nam = (struct sockaddr *)sin6_p; 2527} 2528