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_inet.h" 69 #include "opt_inet6.h" 70 71 #include <sys/param.h> 72 #include <sys/eventhandler.h> 73 #include <sys/errno.h> 74 #include <sys/jail.h> 75 #include <sys/malloc.h> 76 #include <sys/socket.h> 77 #include <sys/socketvar.h> 78 #include <sys/sockio.h> 79 #include <sys/systm.h> 80 #include <sys/priv.h> 81 #include <sys/proc.h> 82 #include <sys/time.h> 83 #include <sys/kernel.h> 84 #include <sys/lock.h> 85 #include <sys/rmlock.h> 86 #include <sys/syslog.h> 87 88 #include <net/if.h> 89 #include <net/if_var.h> 90 #include <net/if_types.h> 91 #include <net/route.h> 92 #include <net/if_dl.h> 93 #include <net/vnet.h> 94 95 #include <netinet/in.h> 96 #include <netinet/in_var.h> 97 #include <net/if_llatbl.h> 98 #include <netinet/if_ether.h> 99 #include <netinet/in_systm.h> 100 #include <netinet/ip.h> 101 #include <netinet/in_pcb.h> 102 #include <netinet/ip_carp.h> 103 104 #include <netinet/ip6.h> 105 #include <netinet6/ip6_var.h> 106 #include <netinet6/nd6.h> 107 #include <netinet6/mld6_var.h> 108 #include <netinet6/ip6_mroute.h> 109 #include <netinet6/in6_ifattach.h> 110 #include <netinet6/scope6_var.h> 111 #include <netinet6/in6_fib.h> 112 #include <netinet6/in6_pcb.h> 113 114 /* 115 * struct in6_ifreq and struct ifreq must be type punnable for common members 116 * of ifr_ifru to allow accessors to be shared. 117 */ 118 _Static_assert(offsetof(struct in6_ifreq, ifr_ifru) == 119 offsetof(struct ifreq, ifr_ifru), 120 "struct in6_ifreq and struct ifreq are not type punnable"); 121 122 VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix); 123 #define V_icmp6_nodeinfo_oldmcprefix VNET(icmp6_nodeinfo_oldmcprefix) 124 125 /* 126 * Definitions of some costant IP6 addresses. 127 */ 128 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 129 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 130 const struct in6_addr in6addr_nodelocal_allnodes = 131 IN6ADDR_NODELOCAL_ALLNODES_INIT; 132 const struct in6_addr in6addr_linklocal_allnodes = 133 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 134 const struct in6_addr in6addr_linklocal_allrouters = 135 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 136 const struct in6_addr in6addr_linklocal_allv2routers = 137 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT; 138 139 const struct in6_addr in6mask0 = IN6MASK0; 140 const struct in6_addr in6mask32 = IN6MASK32; 141 const struct in6_addr in6mask64 = IN6MASK64; 142 const struct in6_addr in6mask96 = IN6MASK96; 143 const struct in6_addr in6mask128 = IN6MASK128; 144 145 const struct sockaddr_in6 sa6_any = 146 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 }; 147 148 static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *, 149 struct in6_aliasreq *, int); 150 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 151 152 static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *, 153 struct in6_ifaddr *, int); 154 static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *, 155 struct in6_aliasreq *, int flags); 156 static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *, 157 struct in6_ifaddr *, int, int); 158 static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *, 159 struct in6_ifaddr *, int); 160 161 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 162 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 163 164 165 void 166 in6_newaddrmsg(struct in6_ifaddr *ia, int cmd) 167 { 168 struct sockaddr_dl gateway; 169 struct sockaddr_in6 mask, addr; 170 struct rtentry rt; 171 int fibnum; 172 173 /* 174 * initialize for rtmsg generation 175 */ 176 bzero(&gateway, sizeof(gateway)); 177 gateway.sdl_len = sizeof(gateway); 178 gateway.sdl_family = AF_LINK; 179 180 bzero(&rt, sizeof(rt)); 181 rt.rt_gateway = (struct sockaddr *)&gateway; 182 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 183 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr)); 184 rt_mask(&rt) = (struct sockaddr *)&mask; 185 rt_key(&rt) = (struct sockaddr *)&addr; 186 rt.rt_flags = RTF_HOST | RTF_STATIC; 187 if (cmd == RTM_ADD) 188 rt.rt_flags |= RTF_UP; 189 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS : ia62ifa(ia)->ifa_ifp->if_fib; 190 /* Announce arrival of local address to this FIB. */ 191 rt_newaddrmsg_fib(cmd, &ia->ia_ifa, 0, &rt, fibnum); 192 } 193 194 int 195 in6_mask2len(struct in6_addr *mask, u_char *lim0) 196 { 197 int x = 0, y; 198 u_char *lim = lim0, *p; 199 200 /* ignore the scope_id part */ 201 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 202 lim = (u_char *)mask + sizeof(*mask); 203 for (p = (u_char *)mask; p < lim; x++, p++) { 204 if (*p != 0xff) 205 break; 206 } 207 y = 0; 208 if (p < lim) { 209 for (y = 0; y < 8; y++) { 210 if ((*p & (0x80 >> y)) == 0) 211 break; 212 } 213 } 214 215 /* 216 * when the limit pointer is given, do a stricter check on the 217 * remaining bits. 218 */ 219 if (p < lim) { 220 if (y != 0 && (*p & (0x00ff >> y)) != 0) 221 return (-1); 222 for (p = p + 1; p < lim; p++) 223 if (*p != 0) 224 return (-1); 225 } 226 227 return x * 8 + y; 228 } 229 230 #ifdef COMPAT_FREEBSD32 231 struct in6_ndifreq32 { 232 char ifname[IFNAMSIZ]; 233 uint32_t ifindex; 234 }; 235 #define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32) 236 #endif 237 238 int 239 in6_control(struct socket *so, u_long cmd, caddr_t data, 240 struct ifnet *ifp, struct thread *td) 241 { 242 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 243 struct in6_ifaddr *ia = NULL; 244 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 245 struct sockaddr_in6 *sa6; 246 int carp_attached = 0; 247 int error; 248 u_long ocmd = cmd; 249 250 /* 251 * Compat to make pre-10.x ifconfig(8) operable. 252 */ 253 if (cmd == OSIOCAIFADDR_IN6) 254 cmd = SIOCAIFADDR_IN6; 255 256 switch (cmd) { 257 case SIOCGETSGCNT_IN6: 258 case SIOCGETMIFCNT_IN6: 259 /* 260 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c. 261 * We cannot see how that would be needed, so do not adjust the 262 * KPI blindly; more likely should clean up the IPv4 variant. 263 */ 264 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP); 265 } 266 267 switch (cmd) { 268 case SIOCAADDRCTL_POLICY: 269 case SIOCDADDRCTL_POLICY: 270 if (td != NULL) { 271 error = priv_check(td, PRIV_NETINET_ADDRCTRL6); 272 if (error) 273 return (error); 274 } 275 return (in6_src_ioctl(cmd, data)); 276 } 277 278 if (ifp == NULL) 279 return (EOPNOTSUPP); 280 281 switch (cmd) { 282 case SIOCSNDFLUSH_IN6: 283 case SIOCSPFXFLUSH_IN6: 284 case SIOCSRTRFLUSH_IN6: 285 case SIOCSDEFIFACE_IN6: 286 case SIOCSIFINFO_FLAGS: 287 case SIOCSIFINFO_IN6: 288 if (td != NULL) { 289 error = priv_check(td, PRIV_NETINET_ND6); 290 if (error) 291 return (error); 292 } 293 /* FALLTHROUGH */ 294 case OSIOCGIFINFO_IN6: 295 case SIOCGIFINFO_IN6: 296 case SIOCGNBRINFO_IN6: 297 case SIOCGDEFIFACE_IN6: 298 return (nd6_ioctl(cmd, data, ifp)); 299 300 #ifdef COMPAT_FREEBSD32 301 case SIOCGDEFIFACE32_IN6: 302 { 303 struct in6_ndifreq ndif; 304 struct in6_ndifreq32 *ndif32; 305 306 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif, 307 ifp); 308 if (error) 309 return (error); 310 ndif32 = (struct in6_ndifreq32 *)data; 311 ndif32->ifindex = ndif.ifindex; 312 return (0); 313 } 314 #endif 315 } 316 317 switch (cmd) { 318 case SIOCSIFPREFIX_IN6: 319 case SIOCDIFPREFIX_IN6: 320 case SIOCAIFPREFIX_IN6: 321 case SIOCCIFPREFIX_IN6: 322 case SIOCSGIFPREFIX_IN6: 323 case SIOCGIFPREFIX_IN6: 324 log(LOG_NOTICE, 325 "prefix ioctls are now invalidated. " 326 "please use ifconfig.\n"); 327 return (EOPNOTSUPP); 328 } 329 330 switch (cmd) { 331 case SIOCSSCOPE6: 332 if (td != NULL) { 333 error = priv_check(td, PRIV_NETINET_SCOPE6); 334 if (error) 335 return (error); 336 } 337 /* FALLTHROUGH */ 338 case SIOCGSCOPE6: 339 case SIOCGSCOPE6DEF: 340 return (scope6_ioctl(cmd, data, ifp)); 341 } 342 343 /* 344 * Find address for this interface, if it exists. 345 * 346 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 347 * only, and used the first interface address as the target of other 348 * operations (without checking ifra_addr). This was because netinet 349 * code/API assumed at most 1 interface address per interface. 350 * Since IPv6 allows a node to assign multiple addresses 351 * on a single interface, we almost always look and check the 352 * presence of ifra_addr, and reject invalid ones here. 353 * It also decreases duplicated code among SIOC*_IN6 operations. 354 */ 355 switch (cmd) { 356 case SIOCAIFADDR_IN6: 357 case SIOCSIFPHYADDR_IN6: 358 sa6 = &ifra->ifra_addr; 359 break; 360 case SIOCSIFADDR_IN6: 361 case SIOCGIFADDR_IN6: 362 case SIOCSIFDSTADDR_IN6: 363 case SIOCSIFNETMASK_IN6: 364 case SIOCGIFDSTADDR_IN6: 365 case SIOCGIFNETMASK_IN6: 366 case SIOCDIFADDR_IN6: 367 case SIOCGIFPSRCADDR_IN6: 368 case SIOCGIFPDSTADDR_IN6: 369 case SIOCGIFAFLAG_IN6: 370 case SIOCSNDFLUSH_IN6: 371 case SIOCSPFXFLUSH_IN6: 372 case SIOCSRTRFLUSH_IN6: 373 case SIOCGIFALIFETIME_IN6: 374 case SIOCGIFSTAT_IN6: 375 case SIOCGIFSTAT_ICMP6: 376 sa6 = &ifr->ifr_addr; 377 break; 378 case SIOCSIFADDR: 379 case SIOCSIFBRDADDR: 380 case SIOCSIFDSTADDR: 381 case SIOCSIFNETMASK: 382 /* 383 * Although we should pass any non-INET6 ioctl requests 384 * down to driver, we filter some legacy INET requests. 385 * Drivers trust SIOCSIFADDR et al to come from an already 386 * privileged layer, and do not perform any credentials 387 * checks or input validation. 388 */ 389 return (EINVAL); 390 default: 391 sa6 = NULL; 392 break; 393 } 394 if (sa6 && sa6->sin6_family == AF_INET6) { 395 if (sa6->sin6_scope_id != 0) 396 error = sa6_embedscope(sa6, 0); 397 else 398 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 399 if (error != 0) 400 return (error); 401 if (td != NULL && (error = prison_check_ip6(td->td_ucred, 402 &sa6->sin6_addr)) != 0) 403 return (error); 404 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 405 } else 406 ia = NULL; 407 408 switch (cmd) { 409 case SIOCSIFADDR_IN6: 410 case SIOCSIFDSTADDR_IN6: 411 case SIOCSIFNETMASK_IN6: 412 /* 413 * Since IPv6 allows a node to assign multiple addresses 414 * on a single interface, SIOCSIFxxx ioctls are deprecated. 415 */ 416 /* we decided to obsolete this command (20000704) */ 417 error = EINVAL; 418 goto out; 419 420 case SIOCDIFADDR_IN6: 421 /* 422 * for IPv4, we look for existing in_ifaddr here to allow 423 * "ifconfig if0 delete" to remove the first IPv4 address on 424 * the interface. For IPv6, as the spec allows multiple 425 * interface address from the day one, we consider "remove the 426 * first one" semantics to be not preferable. 427 */ 428 if (ia == NULL) { 429 error = EADDRNOTAVAIL; 430 goto out; 431 } 432 /* FALLTHROUGH */ 433 case SIOCAIFADDR_IN6: 434 /* 435 * We always require users to specify a valid IPv6 address for 436 * the corresponding operation. 437 */ 438 if (ifra->ifra_addr.sin6_family != AF_INET6 || 439 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 440 error = EAFNOSUPPORT; 441 goto out; 442 } 443 444 if (td != NULL) { 445 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 446 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR); 447 if (error) 448 goto out; 449 } 450 /* FALLTHROUGH */ 451 case SIOCGIFSTAT_IN6: 452 case SIOCGIFSTAT_ICMP6: 453 if (ifp->if_afdata[AF_INET6] == NULL) { 454 error = EPFNOSUPPORT; 455 goto out; 456 } 457 break; 458 459 case SIOCGIFADDR_IN6: 460 /* This interface is basically deprecated. use SIOCGIFCONF. */ 461 /* FALLTHROUGH */ 462 case SIOCGIFAFLAG_IN6: 463 case SIOCGIFNETMASK_IN6: 464 case SIOCGIFDSTADDR_IN6: 465 case SIOCGIFALIFETIME_IN6: 466 /* must think again about its semantics */ 467 if (ia == NULL) { 468 error = EADDRNOTAVAIL; 469 goto out; 470 } 471 break; 472 } 473 474 switch (cmd) { 475 case SIOCGIFADDR_IN6: 476 ifr->ifr_addr = ia->ia_addr; 477 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 478 goto out; 479 break; 480 481 case SIOCGIFDSTADDR_IN6: 482 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 483 error = EINVAL; 484 goto out; 485 } 486 ifr->ifr_dstaddr = ia->ia_dstaddr; 487 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 488 goto out; 489 break; 490 491 case SIOCGIFNETMASK_IN6: 492 ifr->ifr_addr = ia->ia_prefixmask; 493 break; 494 495 case SIOCGIFAFLAG_IN6: 496 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 497 break; 498 499 case SIOCGIFSTAT_IN6: 500 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 501 ifp->if_afdata[AF_INET6])->in6_ifstat, 502 &ifr->ifr_ifru.ifru_stat, 503 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 504 break; 505 506 case SIOCGIFSTAT_ICMP6: 507 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 508 ifp->if_afdata[AF_INET6])->icmp6_ifstat, 509 &ifr->ifr_ifru.ifru_icmp6stat, 510 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 511 break; 512 513 case SIOCGIFALIFETIME_IN6: 514 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 515 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 516 time_t maxexpire; 517 struct in6_addrlifetime *retlt = 518 &ifr->ifr_ifru.ifru_lifetime; 519 520 /* 521 * XXX: adjust expiration time assuming time_t is 522 * signed. 523 */ 524 maxexpire = (-1) & 525 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 526 if (ia->ia6_lifetime.ia6t_vltime < 527 maxexpire - ia->ia6_updatetime) { 528 retlt->ia6t_expire = ia->ia6_updatetime + 529 ia->ia6_lifetime.ia6t_vltime; 530 } else 531 retlt->ia6t_expire = maxexpire; 532 } 533 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 534 time_t maxexpire; 535 struct in6_addrlifetime *retlt = 536 &ifr->ifr_ifru.ifru_lifetime; 537 538 /* 539 * XXX: adjust expiration time assuming time_t is 540 * signed. 541 */ 542 maxexpire = (-1) & 543 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 544 if (ia->ia6_lifetime.ia6t_pltime < 545 maxexpire - ia->ia6_updatetime) { 546 retlt->ia6t_preferred = ia->ia6_updatetime + 547 ia->ia6_lifetime.ia6t_pltime; 548 } else 549 retlt->ia6t_preferred = maxexpire; 550 } 551 break; 552 553 case SIOCAIFADDR_IN6: 554 { 555 struct nd_prefixctl pr0; 556 struct nd_prefix *pr; 557 558 /* 559 * first, make or update the interface address structure, 560 * and link it to the list. 561 */ 562 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 563 goto out; 564 if (ia != NULL) { 565 if (ia->ia_ifa.ifa_carp) 566 (*carp_detach_p)(&ia->ia_ifa, true); 567 ifa_free(&ia->ia_ifa); 568 } 569 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 570 == NULL) { 571 /* 572 * this can happen when the user specify the 0 valid 573 * lifetime. 574 */ 575 break; 576 } 577 578 if (cmd == ocmd && ifra->ifra_vhid > 0) { 579 if (carp_attach_p != NULL) 580 error = (*carp_attach_p)(&ia->ia_ifa, 581 ifra->ifra_vhid); 582 else 583 error = EPROTONOSUPPORT; 584 if (error) 585 goto out; 586 else 587 carp_attached = 1; 588 } 589 590 /* 591 * then, make the prefix on-link on the interface. 592 * XXX: we'd rather create the prefix before the address, but 593 * we need at least one address to install the corresponding 594 * interface route, so we configure the address first. 595 */ 596 597 /* 598 * convert mask to prefix length (prefixmask has already 599 * been validated in in6_update_ifa(). 600 */ 601 bzero(&pr0, sizeof(pr0)); 602 pr0.ndpr_ifp = ifp; 603 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 604 NULL); 605 if (pr0.ndpr_plen == 128) { 606 /* we don't need to install a host route. */ 607 goto aifaddr_out; 608 } 609 pr0.ndpr_prefix = ifra->ifra_addr; 610 /* apply the mask for safety. */ 611 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, 612 &ifra->ifra_prefixmask.sin6_addr); 613 614 /* 615 * XXX: since we don't have an API to set prefix (not address) 616 * lifetimes, we just use the same lifetimes as addresses. 617 * The (temporarily) installed lifetimes can be overridden by 618 * later advertised RAs (when accept_rtadv is non 0), which is 619 * an intended behavior. 620 */ 621 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 622 pr0.ndpr_raf_auto = 623 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 624 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 625 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 626 627 /* add the prefix if not yet. */ 628 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 629 /* 630 * nd6_prelist_add will install the corresponding 631 * interface route. 632 */ 633 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) { 634 if (carp_attached) 635 (*carp_detach_p)(&ia->ia_ifa, false); 636 goto out; 637 } 638 } 639 640 /* relate the address to the prefix */ 641 if (ia->ia6_ndpr == NULL) { 642 ia->ia6_ndpr = pr; 643 pr->ndpr_addrcnt++; 644 645 /* 646 * If this is the first autoconf address from the 647 * prefix, create a temporary address as well 648 * (when required). 649 */ 650 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 651 V_ip6_use_tempaddr && pr->ndpr_addrcnt == 1) { 652 int e; 653 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 654 log(LOG_NOTICE, "in6_control: failed " 655 "to create a temporary address, " 656 "errno=%d\n", e); 657 } 658 } 659 } 660 nd6_prefix_rele(pr); 661 662 /* 663 * this might affect the status of autoconfigured addresses, 664 * that is, this address might make other addresses detached. 665 */ 666 pfxlist_onlink_check(); 667 668 aifaddr_out: 669 /* 670 * Try to clear the flag when a new IPv6 address is added 671 * onto an IFDISABLED interface and it succeeds. 672 */ 673 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) { 674 struct in6_ndireq nd; 675 676 memset(&nd, 0, sizeof(nd)); 677 nd.ndi.flags = ND_IFINFO(ifp)->flags; 678 nd.ndi.flags &= ~ND6_IFF_IFDISABLED; 679 if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0) 680 log(LOG_NOTICE, "SIOCAIFADDR_IN6: " 681 "SIOCSIFINFO_FLAGS for -ifdisabled " 682 "failed."); 683 /* 684 * Ignore failure of clearing the flag intentionally. 685 * The failure means address duplication was detected. 686 */ 687 } 688 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 689 break; 690 } 691 692 case SIOCDIFADDR_IN6: 693 { 694 struct nd_prefix *pr; 695 696 /* 697 * If the address being deleted is the only one that owns 698 * the corresponding prefix, expire the prefix as well. 699 * XXX: theoretically, we don't have to worry about such 700 * relationship, since we separate the address management 701 * and the prefix management. We do this, however, to provide 702 * as much backward compatibility as possible in terms of 703 * the ioctl operation. 704 * Note that in6_purgeaddr() will decrement ndpr_addrcnt. 705 */ 706 pr = ia->ia6_ndpr; 707 in6_purgeaddr(&ia->ia_ifa); 708 if (pr != NULL && pr->ndpr_addrcnt == 0) { 709 ND6_WLOCK(); 710 nd6_prefix_unlink(pr, NULL); 711 ND6_WUNLOCK(); 712 nd6_prefix_del(pr); 713 } 714 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 715 break; 716 } 717 718 default: 719 if (ifp->if_ioctl == NULL) { 720 error = EOPNOTSUPP; 721 goto out; 722 } 723 error = (*ifp->if_ioctl)(ifp, cmd, data); 724 goto out; 725 } 726 727 error = 0; 728 out: 729 if (ia != NULL) 730 ifa_free(&ia->ia_ifa); 731 return (error); 732 } 733 734 735 /* 736 * Join necessary multicast groups. Factored out from in6_update_ifa(). 737 * This entire work should only be done once, for the default FIB. 738 */ 739 static int 740 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra, 741 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol) 742 { 743 char ip6buf[INET6_ADDRSTRLEN]; 744 struct in6_addr mltaddr; 745 struct in6_multi_mship *imm; 746 int delay, error; 747 748 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__)); 749 750 /* Join solicited multicast addr for new host id. */ 751 bzero(&mltaddr, sizeof(struct in6_addr)); 752 mltaddr.s6_addr32[0] = IPV6_ADDR_INT32_MLL; 753 mltaddr.s6_addr32[2] = htonl(1); 754 mltaddr.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 755 mltaddr.s6_addr8[12] = 0xff; 756 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) { 757 /* XXX: should not happen */ 758 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 759 goto cleanup; 760 } 761 delay = error = 0; 762 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 763 /* 764 * We need a random delay for DAD on the address being 765 * configured. It also means delaying transmission of the 766 * corresponding MLD report to avoid report collision. 767 * [RFC 4861, Section 6.3.7] 768 */ 769 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 770 } 771 imm = in6_joingroup(ifp, &mltaddr, &error, delay); 772 if (imm == NULL) { 773 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 774 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 775 if_name(ifp), error)); 776 goto cleanup; 777 } 778 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 779 *in6m_sol = imm->i6mm_maddr; 780 781 /* 782 * Join link-local all-nodes address. 783 */ 784 mltaddr = in6addr_linklocal_allnodes; 785 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 786 goto cleanup; /* XXX: should not fail */ 787 788 imm = in6_joingroup(ifp, &mltaddr, &error, 0); 789 if (imm == NULL) { 790 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 791 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 792 if_name(ifp), error)); 793 goto cleanup; 794 } 795 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 796 797 /* 798 * Join node information group address. 799 */ 800 delay = 0; 801 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 802 /* 803 * The spec does not say anything about delay for this group, 804 * but the same logic should apply. 805 */ 806 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 807 } 808 if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) { 809 /* XXX jinmei */ 810 imm = in6_joingroup(ifp, &mltaddr, &error, delay); 811 if (imm == NULL) 812 nd6log((LOG_WARNING, 813 "%s: in6_joingroup failed for %s on %s " 814 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 815 &mltaddr), if_name(ifp), error)); 816 /* XXX not very fatal, go on... */ 817 else 818 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 819 } 820 if (V_icmp6_nodeinfo_oldmcprefix && 821 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) { 822 imm = in6_joingroup(ifp, &mltaddr, &error, delay); 823 if (imm == NULL) 824 nd6log((LOG_WARNING, 825 "%s: in6_joingroup failed for %s on %s " 826 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 827 &mltaddr), if_name(ifp), error)); 828 /* XXX not very fatal, go on... */ 829 else 830 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 831 } 832 833 /* 834 * Join interface-local all-nodes address. 835 * (ff01::1%ifN, and ff01::%ifN/32) 836 */ 837 mltaddr = in6addr_nodelocal_allnodes; 838 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 839 goto cleanup; /* XXX: should not fail */ 840 841 imm = in6_joingroup(ifp, &mltaddr, &error, 0); 842 if (imm == NULL) { 843 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 844 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 845 &mltaddr), if_name(ifp), error)); 846 goto cleanup; 847 } 848 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 849 850 cleanup: 851 return (error); 852 } 853 854 /* 855 * Update parameters of an IPv6 interface address. 856 * If necessary, a new entry is created and linked into address chains. 857 * This function is separated from in6_control(). 858 */ 859 int 860 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 861 struct in6_ifaddr *ia, int flags) 862 { 863 int error, hostIsNew = 0; 864 865 if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0) 866 return (error); 867 868 if (ia == NULL) { 869 hostIsNew = 1; 870 if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL) 871 return (ENOBUFS); 872 } 873 874 error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags); 875 if (error != 0) { 876 if (hostIsNew != 0) { 877 in6_unlink_ifa(ia, ifp); 878 ifa_free(&ia->ia_ifa); 879 } 880 return (error); 881 } 882 883 if (hostIsNew) 884 error = in6_broadcast_ifa(ifp, ifra, ia, flags); 885 886 return (error); 887 } 888 889 /* 890 * Fill in basic IPv6 address request info. 891 */ 892 void 893 in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr, 894 const struct in6_addr *mask) 895 { 896 897 memset(ifra, 0, sizeof(struct in6_aliasreq)); 898 899 ifra->ifra_addr.sin6_family = AF_INET6; 900 ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 901 if (addr != NULL) 902 ifra->ifra_addr.sin6_addr = *addr; 903 904 ifra->ifra_prefixmask.sin6_family = AF_INET6; 905 ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 906 if (mask != NULL) 907 ifra->ifra_prefixmask.sin6_addr = *mask; 908 } 909 910 static int 911 in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra, 912 struct in6_ifaddr *ia, int flags) 913 { 914 int plen = -1; 915 struct sockaddr_in6 dst6; 916 struct in6_addrlifetime *lt; 917 char ip6buf[INET6_ADDRSTRLEN]; 918 919 /* Validate parameters */ 920 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 921 return (EINVAL); 922 923 /* 924 * The destination address for a p2p link must have a family 925 * of AF_UNSPEC or AF_INET6. 926 */ 927 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 928 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 929 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 930 return (EAFNOSUPPORT); 931 932 /* 933 * Validate address 934 */ 935 if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) || 936 ifra->ifra_addr.sin6_family != AF_INET6) 937 return (EINVAL); 938 939 /* 940 * validate ifra_prefixmask. don't check sin6_family, netmask 941 * does not carry fields other than sin6_len. 942 */ 943 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 944 return (EINVAL); 945 /* 946 * Because the IPv6 address architecture is classless, we require 947 * users to specify a (non 0) prefix length (mask) for a new address. 948 * We also require the prefix (when specified) mask is valid, and thus 949 * reject a non-consecutive mask. 950 */ 951 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 952 return (EINVAL); 953 if (ifra->ifra_prefixmask.sin6_len != 0) { 954 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 955 (u_char *)&ifra->ifra_prefixmask + 956 ifra->ifra_prefixmask.sin6_len); 957 if (plen <= 0) 958 return (EINVAL); 959 } else { 960 /* 961 * In this case, ia must not be NULL. We just use its prefix 962 * length. 963 */ 964 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 965 } 966 /* 967 * If the destination address on a p2p interface is specified, 968 * and the address is a scoped one, validate/set the scope 969 * zone identifier. 970 */ 971 dst6 = ifra->ifra_dstaddr; 972 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 973 (dst6.sin6_family == AF_INET6)) { 974 struct in6_addr in6_tmp; 975 u_int32_t zoneid; 976 977 in6_tmp = dst6.sin6_addr; 978 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 979 return (EINVAL); /* XXX: should be impossible */ 980 981 if (dst6.sin6_scope_id != 0) { 982 if (dst6.sin6_scope_id != zoneid) 983 return (EINVAL); 984 } else /* user omit to specify the ID. */ 985 dst6.sin6_scope_id = zoneid; 986 987 /* convert into the internal form */ 988 if (sa6_embedscope(&dst6, 0)) 989 return (EINVAL); /* XXX: should be impossible */ 990 } 991 /* Modify original ifra_dstaddr to reflect changes */ 992 ifra->ifra_dstaddr = dst6; 993 994 /* 995 * The destination address can be specified only for a p2p or a 996 * loopback interface. If specified, the corresponding prefix length 997 * must be 128. 998 */ 999 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 1000 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 1001 /* XXX: noisy message */ 1002 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 1003 "be specified for a p2p or a loopback IF only\n")); 1004 return (EINVAL); 1005 } 1006 if (plen != 128) { 1007 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 1008 "be 128 when dstaddr is specified\n")); 1009 return (EINVAL); 1010 } 1011 } 1012 /* lifetime consistency check */ 1013 lt = &ifra->ifra_lifetime; 1014 if (lt->ia6t_pltime > lt->ia6t_vltime) 1015 return (EINVAL); 1016 if (lt->ia6t_vltime == 0) { 1017 /* 1018 * the following log might be noisy, but this is a typical 1019 * configuration mistake or a tool's bug. 1020 */ 1021 nd6log((LOG_INFO, 1022 "in6_update_ifa: valid lifetime is 0 for %s\n", 1023 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr))); 1024 1025 if (ia == NULL) 1026 return (0); /* there's nothing to do */ 1027 } 1028 1029 /* Check prefix mask */ 1030 if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) { 1031 /* 1032 * We prohibit changing the prefix length of an existing 1033 * address, because 1034 * + such an operation should be rare in IPv6, and 1035 * + the operation would confuse prefix management. 1036 */ 1037 if (ia->ia_prefixmask.sin6_len != 0 && 1038 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 1039 nd6log((LOG_INFO, "in6_validate_ifa: the prefix length " 1040 "of an existing %s address should not be changed\n", 1041 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1042 1043 return (EINVAL); 1044 } 1045 } 1046 1047 return (0); 1048 } 1049 1050 1051 /* 1052 * Allocate a new ifaddr and link it into chains. 1053 */ 1054 static struct in6_ifaddr * 1055 in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags) 1056 { 1057 struct in6_ifaddr *ia; 1058 1059 /* 1060 * When in6_alloc_ifa() is called in a process of a received 1061 * RA, it is called under an interrupt context. So, we should 1062 * call malloc with M_NOWAIT. 1063 */ 1064 ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT); 1065 if (ia == NULL) 1066 return (NULL); 1067 LIST_INIT(&ia->ia6_memberships); 1068 /* Initialize the address and masks, and put time stamp */ 1069 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1070 ia->ia_addr.sin6_family = AF_INET6; 1071 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 1072 /* XXX: Can we assign ,sin6_addr and skip the rest? */ 1073 ia->ia_addr = ifra->ifra_addr; 1074 ia->ia6_createtime = time_uptime; 1075 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1076 /* 1077 * Some functions expect that ifa_dstaddr is not 1078 * NULL for p2p interfaces. 1079 */ 1080 ia->ia_ifa.ifa_dstaddr = 1081 (struct sockaddr *)&ia->ia_dstaddr; 1082 } else { 1083 ia->ia_ifa.ifa_dstaddr = NULL; 1084 } 1085 1086 /* set prefix mask if any */ 1087 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 1088 if (ifra->ifra_prefixmask.sin6_len != 0) { 1089 ia->ia_prefixmask.sin6_family = AF_INET6; 1090 ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len; 1091 ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr; 1092 } 1093 1094 ia->ia_ifp = ifp; 1095 ifa_ref(&ia->ia_ifa); /* if_addrhead */ 1096 IF_ADDR_WLOCK(ifp); 1097 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1098 IF_ADDR_WUNLOCK(ifp); 1099 1100 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */ 1101 IN6_IFADDR_WLOCK(); 1102 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link); 1103 LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash); 1104 IN6_IFADDR_WUNLOCK(); 1105 1106 return (ia); 1107 } 1108 1109 /* 1110 * Update/configure interface address parameters: 1111 * 1112 * 1) Update lifetime 1113 * 2) Update interface metric ad flags 1114 * 3) Notify other subsystems 1115 */ 1116 static int 1117 in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra, 1118 struct in6_ifaddr *ia, int hostIsNew, int flags) 1119 { 1120 int error; 1121 1122 /* update timestamp */ 1123 ia->ia6_updatetime = time_uptime; 1124 1125 /* 1126 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1127 * to see if the address is deprecated or invalidated, but initialize 1128 * these members for applications. 1129 */ 1130 ia->ia6_lifetime = ifra->ifra_lifetime; 1131 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1132 ia->ia6_lifetime.ia6t_expire = 1133 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1134 } else 1135 ia->ia6_lifetime.ia6t_expire = 0; 1136 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1137 ia->ia6_lifetime.ia6t_preferred = 1138 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1139 } else 1140 ia->ia6_lifetime.ia6t_preferred = 0; 1141 1142 /* 1143 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1144 * userland, make it deprecated. 1145 */ 1146 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1147 ia->ia6_lifetime.ia6t_pltime = 0; 1148 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1149 } 1150 1151 /* 1152 * configure address flags. 1153 */ 1154 ia->ia6_flags = ifra->ifra_flags; 1155 1156 /* 1157 * Make the address tentative before joining multicast addresses, 1158 * so that corresponding MLD responses would not have a tentative 1159 * source address. 1160 */ 1161 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1162 1163 /* 1164 * DAD should be performed for an new address or addresses on 1165 * an interface with ND6_IFF_IFDISABLED. 1166 */ 1167 if (in6if_do_dad(ifp) && 1168 (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED))) 1169 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1170 1171 /* notify other subsystems */ 1172 error = in6_notify_ifa(ifp, ia, ifra, hostIsNew); 1173 1174 return (error); 1175 } 1176 1177 /* 1178 * Do link-level ifa job: 1179 * 1) Add lle entry for added address 1180 * 2) Notifies routing socket users about new address 1181 * 3) join appropriate multicast group 1182 * 4) start DAD if enabled 1183 */ 1184 static int 1185 in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1186 struct in6_ifaddr *ia, int flags) 1187 { 1188 struct in6_multi *in6m_sol; 1189 int error = 0; 1190 1191 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1192 if ((error = nd6_add_ifa_lle(ia)) != 0) { 1193 in6_purgeaddr(&ia->ia_ifa); 1194 ifa_free(&ia->ia_ifa); 1195 return (error); 1196 } 1197 1198 /* Join necessary multicast groups. */ 1199 in6m_sol = NULL; 1200 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1201 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol); 1202 if (error != 0) { 1203 in6_purgeaddr(&ia->ia_ifa); 1204 ifa_free(&ia->ia_ifa); 1205 return (error); 1206 } 1207 } 1208 1209 /* Perform DAD, if the address is TENTATIVE. */ 1210 if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) { 1211 int delay, mindelay, maxdelay; 1212 1213 delay = 0; 1214 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1215 /* 1216 * We need to impose a delay before sending an NS 1217 * for DAD. Check if we also needed a delay for the 1218 * corresponding MLD message. If we did, the delay 1219 * should be larger than the MLD delay (this could be 1220 * relaxed a bit, but this simple logic is at least 1221 * safe). 1222 * XXX: Break data hiding guidelines and look at 1223 * state for the solicited multicast group. 1224 */ 1225 mindelay = 0; 1226 if (in6m_sol != NULL && 1227 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) { 1228 mindelay = in6m_sol->in6m_timer; 1229 } 1230 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1231 if (maxdelay - mindelay == 0) 1232 delay = 0; 1233 else { 1234 delay = 1235 (arc4random() % (maxdelay - mindelay)) + 1236 mindelay; 1237 } 1238 } 1239 nd6_dad_start((struct ifaddr *)ia, delay); 1240 } 1241 1242 in6_newaddrmsg(ia, RTM_ADD); 1243 ifa_free(&ia->ia_ifa); 1244 return (error); 1245 } 1246 1247 void 1248 in6_purgeaddr(struct ifaddr *ifa) 1249 { 1250 struct ifnet *ifp = ifa->ifa_ifp; 1251 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1252 struct in6_multi_mship *imm; 1253 int plen, error; 1254 1255 if (ifa->ifa_carp) 1256 (*carp_detach_p)(ifa, false); 1257 1258 /* 1259 * Remove the loopback route to the interface address. 1260 * The check for the current setting of "nd6_useloopback" 1261 * is not needed. 1262 */ 1263 if (ia->ia_flags & IFA_RTSELF) { 1264 error = ifa_del_loopback_route((struct ifaddr *)ia, 1265 (struct sockaddr *)&ia->ia_addr); 1266 if (error == 0) 1267 ia->ia_flags &= ~IFA_RTSELF; 1268 } 1269 1270 /* stop DAD processing */ 1271 nd6_dad_stop(ifa); 1272 1273 /* Leave multicast groups. */ 1274 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1275 LIST_REMOVE(imm, i6mm_chain); 1276 in6_leavegroup(imm); 1277 } 1278 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1279 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) { 1280 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags | 1281 (ia->ia_dstaddr.sin6_family == AF_INET6 ? RTF_HOST : 0)); 1282 if (error != 0) 1283 log(LOG_INFO, "%s: err=%d, destination address delete " 1284 "failed\n", __func__, error); 1285 ia->ia_flags &= ~IFA_ROUTE; 1286 } 1287 1288 in6_newaddrmsg(ia, RTM_DELETE); 1289 in6_unlink_ifa(ia, ifp); 1290 } 1291 1292 static void 1293 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1294 { 1295 char ip6buf[INET6_ADDRSTRLEN]; 1296 int remove_lle; 1297 1298 IF_ADDR_WLOCK(ifp); 1299 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1300 IF_ADDR_WUNLOCK(ifp); 1301 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1302 1303 /* 1304 * Defer the release of what might be the last reference to the 1305 * in6_ifaddr so that it can't be freed before the remainder of the 1306 * cleanup. 1307 */ 1308 IN6_IFADDR_WLOCK(); 1309 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 1310 LIST_REMOVE(ia, ia6_hash); 1311 IN6_IFADDR_WUNLOCK(); 1312 1313 /* 1314 * Release the reference to the base prefix. There should be a 1315 * positive reference. 1316 */ 1317 remove_lle = 0; 1318 if (ia->ia6_ndpr == NULL) { 1319 nd6log((LOG_NOTICE, 1320 "in6_unlink_ifa: autoconf'ed address " 1321 "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia)))); 1322 } else { 1323 ia->ia6_ndpr->ndpr_addrcnt--; 1324 /* Do not delete lles within prefix if refcont != 0 */ 1325 if (ia->ia6_ndpr->ndpr_addrcnt == 0) 1326 remove_lle = 1; 1327 ia->ia6_ndpr = NULL; 1328 } 1329 1330 nd6_rem_ifa_lle(ia, remove_lle); 1331 1332 /* 1333 * Also, if the address being removed is autoconf'ed, call 1334 * pfxlist_onlink_check() since the release might affect the status of 1335 * other (detached) addresses. 1336 */ 1337 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1338 pfxlist_onlink_check(); 1339 } 1340 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1341 } 1342 1343 /* 1344 * Notifies other subsystems about address change/arrival: 1345 * 1) Notifies device handler on the first IPv6 address assignment 1346 * 2) Handle routing table changes for P2P links and route 1347 * 3) Handle routing table changes for address host route 1348 */ 1349 static int 1350 in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia, 1351 struct in6_aliasreq *ifra, int hostIsNew) 1352 { 1353 int error = 0, plen, ifacount = 0; 1354 struct ifaddr *ifa; 1355 struct sockaddr_in6 *pdst; 1356 char ip6buf[INET6_ADDRSTRLEN]; 1357 1358 /* 1359 * Give the interface a chance to initialize 1360 * if this is its first address, 1361 */ 1362 if (hostIsNew != 0) { 1363 IF_ADDR_RLOCK(ifp); 1364 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1365 if (ifa->ifa_addr->sa_family != AF_INET6) 1366 continue; 1367 ifacount++; 1368 } 1369 IF_ADDR_RUNLOCK(ifp); 1370 } 1371 1372 if (ifacount <= 1 && ifp->if_ioctl) { 1373 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1374 if (error) 1375 return (error); 1376 } 1377 1378 /* 1379 * If a new destination address is specified, scrub the old one and 1380 * install the new destination. Note that the interface must be 1381 * p2p or loopback. 1382 */ 1383 pdst = &ifra->ifra_dstaddr; 1384 if (pdst->sin6_family == AF_INET6 && 1385 !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1386 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1387 (rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0)) { 1388 nd6log((LOG_ERR, "in6_update_ifa_internal: failed to " 1389 "remove a route to the old destination: %s\n", 1390 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1391 /* proceed anyway... */ 1392 } else 1393 ia->ia_flags &= ~IFA_ROUTE; 1394 ia->ia_dstaddr = *pdst; 1395 } 1396 1397 /* 1398 * If a new destination address is specified for a point-to-point 1399 * interface, install a route to the destination as an interface 1400 * direct route. 1401 * XXX: the logic below rejects assigning multiple addresses on a p2p 1402 * interface that share the same destination. 1403 */ 1404 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1405 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 && 1406 ia->ia_dstaddr.sin6_family == AF_INET6) { 1407 int rtflags = RTF_UP | RTF_HOST; 1408 /* 1409 * Handle the case for ::1 . 1410 */ 1411 if (ifp->if_flags & IFF_LOOPBACK) 1412 ia->ia_flags |= IFA_RTSELF; 1413 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags); 1414 if (error) 1415 return (error); 1416 ia->ia_flags |= IFA_ROUTE; 1417 } 1418 1419 /* 1420 * add a loopback route to self if not exists 1421 */ 1422 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) { 1423 error = ifa_add_loopback_route((struct ifaddr *)ia, 1424 (struct sockaddr *)&ia->ia_addr); 1425 if (error == 0) 1426 ia->ia_flags |= IFA_RTSELF; 1427 } 1428 1429 return (error); 1430 } 1431 1432 /* 1433 * Find an IPv6 interface link-local address specific to an interface. 1434 * ifaddr is returned referenced. 1435 */ 1436 struct in6_ifaddr * 1437 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1438 { 1439 struct ifaddr *ifa; 1440 1441 IF_ADDR_RLOCK(ifp); 1442 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1443 if (ifa->ifa_addr->sa_family != AF_INET6) 1444 continue; 1445 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1446 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1447 ignoreflags) != 0) 1448 continue; 1449 ifa_ref(ifa); 1450 break; 1451 } 1452 } 1453 IF_ADDR_RUNLOCK(ifp); 1454 1455 return ((struct in6_ifaddr *)ifa); 1456 } 1457 1458 1459 /* 1460 * find the interface address corresponding to a given IPv6 address. 1461 * ifaddr is returned referenced. 1462 */ 1463 struct in6_ifaddr * 1464 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid) 1465 { 1466 struct rm_priotracker in6_ifa_tracker; 1467 struct in6_ifaddr *ia; 1468 1469 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1470 LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) { 1471 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1472 if (zoneid != 0 && 1473 zoneid != ia->ia_addr.sin6_scope_id) 1474 continue; 1475 ifa_ref(&ia->ia_ifa); 1476 break; 1477 } 1478 } 1479 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1480 return (ia); 1481 } 1482 1483 /* 1484 * find the internet address corresponding to a given interface and address. 1485 * ifaddr is returned referenced. 1486 */ 1487 struct in6_ifaddr * 1488 in6ifa_ifpwithaddr(struct ifnet *ifp, const struct in6_addr *addr) 1489 { 1490 struct ifaddr *ifa; 1491 1492 IF_ADDR_RLOCK(ifp); 1493 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1494 if (ifa->ifa_addr->sa_family != AF_INET6) 1495 continue; 1496 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1497 ifa_ref(ifa); 1498 break; 1499 } 1500 } 1501 IF_ADDR_RUNLOCK(ifp); 1502 1503 return ((struct in6_ifaddr *)ifa); 1504 } 1505 1506 /* 1507 * Find a link-local scoped address on ifp and return it if any. 1508 */ 1509 struct in6_ifaddr * 1510 in6ifa_llaonifp(struct ifnet *ifp) 1511 { 1512 struct sockaddr_in6 *sin6; 1513 struct ifaddr *ifa; 1514 1515 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1516 return (NULL); 1517 IF_ADDR_RLOCK(ifp); 1518 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1519 if (ifa->ifa_addr->sa_family != AF_INET6) 1520 continue; 1521 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 1522 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 1523 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) || 1524 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr)) 1525 break; 1526 } 1527 IF_ADDR_RUNLOCK(ifp); 1528 1529 return ((struct in6_ifaddr *)ifa); 1530 } 1531 1532 /* 1533 * Convert IP6 address to printable (loggable) representation. Caller 1534 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 1535 */ 1536 static char digits[] = "0123456789abcdef"; 1537 char * 1538 ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 1539 { 1540 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0; 1541 char *cp; 1542 const u_int16_t *a = (const u_int16_t *)addr; 1543 const u_int8_t *d; 1544 int dcolon = 0, zero = 0; 1545 1546 cp = ip6buf; 1547 1548 for (i = 0; i < 8; i++) { 1549 if (*(a + i) == 0) { 1550 cnt++; 1551 if (cnt == 1) 1552 idx = i; 1553 } 1554 else if (maxcnt < cnt) { 1555 maxcnt = cnt; 1556 index = idx; 1557 cnt = 0; 1558 } 1559 } 1560 if (maxcnt < cnt) { 1561 maxcnt = cnt; 1562 index = idx; 1563 } 1564 1565 for (i = 0; i < 8; i++) { 1566 if (dcolon == 1) { 1567 if (*a == 0) { 1568 if (i == 7) 1569 *cp++ = ':'; 1570 a++; 1571 continue; 1572 } else 1573 dcolon = 2; 1574 } 1575 if (*a == 0) { 1576 if (dcolon == 0 && *(a + 1) == 0 && i == index) { 1577 if (i == 0) 1578 *cp++ = ':'; 1579 *cp++ = ':'; 1580 dcolon = 1; 1581 } else { 1582 *cp++ = '0'; 1583 *cp++ = ':'; 1584 } 1585 a++; 1586 continue; 1587 } 1588 d = (const u_char *)a; 1589 /* Try to eliminate leading zeros in printout like in :0001. */ 1590 zero = 1; 1591 *cp = digits[*d >> 4]; 1592 if (*cp != '0') { 1593 zero = 0; 1594 cp++; 1595 } 1596 *cp = digits[*d++ & 0xf]; 1597 if (zero == 0 || (*cp != '0')) { 1598 zero = 0; 1599 cp++; 1600 } 1601 *cp = digits[*d >> 4]; 1602 if (zero == 0 || (*cp != '0')) { 1603 zero = 0; 1604 cp++; 1605 } 1606 *cp++ = digits[*d & 0xf]; 1607 *cp++ = ':'; 1608 a++; 1609 } 1610 *--cp = '\0'; 1611 return (ip6buf); 1612 } 1613 1614 int 1615 in6_localaddr(struct in6_addr *in6) 1616 { 1617 struct rm_priotracker in6_ifa_tracker; 1618 struct in6_ifaddr *ia; 1619 1620 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1621 return 1; 1622 1623 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1624 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 1625 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1626 &ia->ia_prefixmask.sin6_addr)) { 1627 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1628 return 1; 1629 } 1630 } 1631 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1632 1633 return (0); 1634 } 1635 1636 /* 1637 * Return 1 if an internet address is for the local host and configured 1638 * on one of its interfaces. 1639 */ 1640 int 1641 in6_localip(struct in6_addr *in6) 1642 { 1643 struct rm_priotracker in6_ifa_tracker; 1644 struct in6_ifaddr *ia; 1645 1646 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1647 LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 1648 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) { 1649 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1650 return (1); 1651 } 1652 } 1653 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1654 return (0); 1655 } 1656 1657 /* 1658 * Return 1 if an internet address is configured on an interface. 1659 */ 1660 int 1661 in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr) 1662 { 1663 struct in6_addr in6; 1664 struct ifaddr *ifa; 1665 struct in6_ifaddr *ia6; 1666 1667 in6 = *addr; 1668 if (in6_clearscope(&in6)) 1669 return (0); 1670 in6_setscope(&in6, ifp, NULL); 1671 1672 IF_ADDR_RLOCK(ifp); 1673 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1674 if (ifa->ifa_addr->sa_family != AF_INET6) 1675 continue; 1676 ia6 = (struct in6_ifaddr *)ifa; 1677 if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) { 1678 IF_ADDR_RUNLOCK(ifp); 1679 return (1); 1680 } 1681 } 1682 IF_ADDR_RUNLOCK(ifp); 1683 1684 return (0); 1685 } 1686 1687 int 1688 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1689 { 1690 struct rm_priotracker in6_ifa_tracker; 1691 struct in6_ifaddr *ia; 1692 1693 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1694 LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) { 1695 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) { 1696 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 1697 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1698 return (1); /* true */ 1699 } 1700 break; 1701 } 1702 } 1703 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1704 1705 return (0); /* false */ 1706 } 1707 1708 /* 1709 * return length of part which dst and src are equal 1710 * hard coding... 1711 */ 1712 int 1713 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1714 { 1715 int match = 0; 1716 u_char *s = (u_char *)src, *d = (u_char *)dst; 1717 u_char *lim = s + 16, r; 1718 1719 while (s < lim) 1720 if ((r = (*d++ ^ *s++)) != 0) { 1721 while (r < 128) { 1722 match++; 1723 r <<= 1; 1724 } 1725 break; 1726 } else 1727 match += 8; 1728 return match; 1729 } 1730 1731 /* XXX: to be scope conscious */ 1732 int 1733 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1734 { 1735 int bytelen, bitlen; 1736 1737 /* sanity check */ 1738 if (0 > len || len > 128) { 1739 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1740 len); 1741 return (0); 1742 } 1743 1744 bytelen = len / 8; 1745 bitlen = len % 8; 1746 1747 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1748 return (0); 1749 if (bitlen != 0 && 1750 p1->s6_addr[bytelen] >> (8 - bitlen) != 1751 p2->s6_addr[bytelen] >> (8 - bitlen)) 1752 return (0); 1753 1754 return (1); 1755 } 1756 1757 void 1758 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1759 { 1760 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1761 int bytelen, bitlen, i; 1762 1763 /* sanity check */ 1764 if (0 > len || len > 128) { 1765 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1766 len); 1767 return; 1768 } 1769 1770 bzero(maskp, sizeof(*maskp)); 1771 bytelen = len / 8; 1772 bitlen = len % 8; 1773 for (i = 0; i < bytelen; i++) 1774 maskp->s6_addr[i] = 0xff; 1775 if (bitlen) 1776 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1777 } 1778 1779 /* 1780 * return the best address out of the same scope. if no address was 1781 * found, return the first valid address from designated IF. 1782 */ 1783 struct in6_ifaddr * 1784 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 1785 { 1786 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 1787 struct ifaddr *ifa; 1788 struct in6_ifaddr *besta = NULL; 1789 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 1790 1791 dep[0] = dep[1] = NULL; 1792 1793 /* 1794 * We first look for addresses in the same scope. 1795 * If there is one, return it. 1796 * If two or more, return one which matches the dst longest. 1797 * If none, return one of global addresses assigned other ifs. 1798 */ 1799 IF_ADDR_RLOCK(ifp); 1800 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1801 if (ifa->ifa_addr->sa_family != AF_INET6) 1802 continue; 1803 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1804 continue; /* XXX: is there any case to allow anycast? */ 1805 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1806 continue; /* don't use this interface */ 1807 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1808 continue; 1809 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1810 if (V_ip6_use_deprecated) 1811 dep[0] = (struct in6_ifaddr *)ifa; 1812 continue; 1813 } 1814 1815 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 1816 /* 1817 * call in6_matchlen() as few as possible 1818 */ 1819 if (besta) { 1820 if (blen == -1) 1821 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 1822 tlen = in6_matchlen(IFA_IN6(ifa), dst); 1823 if (tlen > blen) { 1824 blen = tlen; 1825 besta = (struct in6_ifaddr *)ifa; 1826 } 1827 } else 1828 besta = (struct in6_ifaddr *)ifa; 1829 } 1830 } 1831 if (besta) { 1832 ifa_ref(&besta->ia_ifa); 1833 IF_ADDR_RUNLOCK(ifp); 1834 return (besta); 1835 } 1836 1837 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1838 if (ifa->ifa_addr->sa_family != AF_INET6) 1839 continue; 1840 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1841 continue; /* XXX: is there any case to allow anycast? */ 1842 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1843 continue; /* don't use this interface */ 1844 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1845 continue; 1846 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1847 if (V_ip6_use_deprecated) 1848 dep[1] = (struct in6_ifaddr *)ifa; 1849 continue; 1850 } 1851 1852 if (ifa != NULL) 1853 ifa_ref(ifa); 1854 IF_ADDR_RUNLOCK(ifp); 1855 return (struct in6_ifaddr *)ifa; 1856 } 1857 1858 /* use the last-resort values, that are, deprecated addresses */ 1859 if (dep[0]) { 1860 ifa_ref((struct ifaddr *)dep[0]); 1861 IF_ADDR_RUNLOCK(ifp); 1862 return dep[0]; 1863 } 1864 if (dep[1]) { 1865 ifa_ref((struct ifaddr *)dep[1]); 1866 IF_ADDR_RUNLOCK(ifp); 1867 return dep[1]; 1868 } 1869 1870 IF_ADDR_RUNLOCK(ifp); 1871 return NULL; 1872 } 1873 1874 /* 1875 * perform DAD when interface becomes IFF_UP. 1876 */ 1877 void 1878 in6_if_up(struct ifnet *ifp) 1879 { 1880 struct ifaddr *ifa; 1881 struct in6_ifaddr *ia; 1882 1883 IF_ADDR_RLOCK(ifp); 1884 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1885 if (ifa->ifa_addr->sa_family != AF_INET6) 1886 continue; 1887 ia = (struct in6_ifaddr *)ifa; 1888 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 1889 /* 1890 * The TENTATIVE flag was likely set by hand 1891 * beforehand, implicitly indicating the need for DAD. 1892 * We may be able to skip the random delay in this 1893 * case, but we impose delays just in case. 1894 */ 1895 nd6_dad_start(ifa, 1896 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 1897 } 1898 } 1899 IF_ADDR_RUNLOCK(ifp); 1900 1901 /* 1902 * special cases, like 6to4, are handled in in6_ifattach 1903 */ 1904 in6_ifattach(ifp, NULL); 1905 } 1906 1907 int 1908 in6if_do_dad(struct ifnet *ifp) 1909 { 1910 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 1911 return (0); 1912 1913 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) || 1914 (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD)) 1915 return (0); 1916 1917 /* 1918 * Our DAD routine requires the interface up and running. 1919 * However, some interfaces can be up before the RUNNING 1920 * status. Additionally, users may try to assign addresses 1921 * before the interface becomes up (or running). 1922 * This function returns EAGAIN in that case. 1923 * The caller should mark "tentative" on the address instead of 1924 * performing DAD immediately. 1925 */ 1926 if (!((ifp->if_flags & IFF_UP) && 1927 (ifp->if_drv_flags & IFF_DRV_RUNNING))) 1928 return (EAGAIN); 1929 1930 return (1); 1931 } 1932 1933 /* 1934 * Calculate max IPv6 MTU through all the interfaces and store it 1935 * to in6_maxmtu. 1936 */ 1937 void 1938 in6_setmaxmtu(void) 1939 { 1940 unsigned long maxmtu = 0; 1941 struct ifnet *ifp; 1942 1943 IFNET_RLOCK_NOSLEEP(); 1944 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1945 /* this function can be called during ifnet initialization */ 1946 if (!ifp->if_afdata[AF_INET6]) 1947 continue; 1948 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 1949 IN6_LINKMTU(ifp) > maxmtu) 1950 maxmtu = IN6_LINKMTU(ifp); 1951 } 1952 IFNET_RUNLOCK_NOSLEEP(); 1953 if (maxmtu) /* update only when maxmtu is positive */ 1954 V_in6_maxmtu = maxmtu; 1955 } 1956 1957 /* 1958 * Provide the length of interface identifiers to be used for the link attached 1959 * to the given interface. The length should be defined in "IPv6 over 1960 * xxx-link" document. Note that address architecture might also define 1961 * the length for a particular set of address prefixes, regardless of the 1962 * link type. As clarified in rfc2462bis, those two definitions should be 1963 * consistent, and those really are as of August 2004. 1964 */ 1965 int 1966 in6_if2idlen(struct ifnet *ifp) 1967 { 1968 switch (ifp->if_type) { 1969 case IFT_ETHER: /* RFC2464 */ 1970 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 1971 case IFT_L2VLAN: /* ditto */ 1972 case IFT_BRIDGE: /* bridge(4) only does Ethernet-like links */ 1973 case IFT_INFINIBAND: 1974 return (64); 1975 case IFT_PPP: /* RFC2472 */ 1976 return (64); 1977 case IFT_FRELAY: /* RFC2590 */ 1978 return (64); 1979 case IFT_IEEE1394: /* RFC3146 */ 1980 return (64); 1981 case IFT_GIF: 1982 return (64); /* draft-ietf-v6ops-mech-v2-07 */ 1983 case IFT_LOOP: 1984 return (64); /* XXX: is this really correct? */ 1985 default: 1986 /* 1987 * Unknown link type: 1988 * It might be controversial to use the today's common constant 1989 * of 64 for these cases unconditionally. For full compliance, 1990 * we should return an error in this case. On the other hand, 1991 * if we simply miss the standard for the link type or a new 1992 * standard is defined for a new link type, the IFID length 1993 * is very likely to be the common constant. As a compromise, 1994 * we always use the constant, but make an explicit notice 1995 * indicating the "unknown" case. 1996 */ 1997 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 1998 return (64); 1999 } 2000 } 2001 2002 #include <sys/sysctl.h> 2003 2004 struct in6_llentry { 2005 struct llentry base; 2006 }; 2007 2008 #define IN6_LLTBL_DEFAULT_HSIZE 32 2009 #define IN6_LLTBL_HASH(k, h) \ 2010 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 2011 2012 /* 2013 * Do actual deallocation of @lle. 2014 */ 2015 static void 2016 in6_lltable_destroy_lle_unlocked(struct llentry *lle) 2017 { 2018 2019 LLE_LOCK_DESTROY(lle); 2020 LLE_REQ_DESTROY(lle); 2021 free(lle, M_LLTABLE); 2022 } 2023 2024 /* 2025 * Called by LLE_FREE_LOCKED when number of references 2026 * drops to zero. 2027 */ 2028 static void 2029 in6_lltable_destroy_lle(struct llentry *lle) 2030 { 2031 2032 LLE_WUNLOCK(lle); 2033 in6_lltable_destroy_lle_unlocked(lle); 2034 } 2035 2036 static struct llentry * 2037 in6_lltable_new(const struct in6_addr *addr6, u_int flags) 2038 { 2039 struct in6_llentry *lle; 2040 2041 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 2042 if (lle == NULL) /* NB: caller generates msg */ 2043 return NULL; 2044 2045 lle->base.r_l3addr.addr6 = *addr6; 2046 lle->base.lle_refcnt = 1; 2047 lle->base.lle_free = in6_lltable_destroy_lle; 2048 LLE_LOCK_INIT(&lle->base); 2049 LLE_REQ_INIT(&lle->base); 2050 callout_init(&lle->base.lle_timer, 1); 2051 2052 return (&lle->base); 2053 } 2054 2055 static int 2056 in6_lltable_match_prefix(const struct sockaddr *saddr, 2057 const struct sockaddr *smask, u_int flags, struct llentry *lle) 2058 { 2059 const struct in6_addr *addr, *mask, *lle_addr; 2060 2061 addr = &((const struct sockaddr_in6 *)saddr)->sin6_addr; 2062 mask = &((const struct sockaddr_in6 *)smask)->sin6_addr; 2063 lle_addr = &lle->r_l3addr.addr6; 2064 2065 if (IN6_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0) 2066 return (0); 2067 2068 if (lle->la_flags & LLE_IFADDR) { 2069 2070 /* 2071 * Delete LLE_IFADDR records IFF address & flag matches. 2072 * Note that addr is the interface address within prefix 2073 * being matched. 2074 */ 2075 if (IN6_ARE_ADDR_EQUAL(addr, lle_addr) && 2076 (flags & LLE_STATIC) != 0) 2077 return (1); 2078 return (0); 2079 } 2080 2081 /* flags & LLE_STATIC means deleting both dynamic and static entries */ 2082 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC)) 2083 return (1); 2084 2085 return (0); 2086 } 2087 2088 static void 2089 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle) 2090 { 2091 struct ifnet *ifp; 2092 2093 LLE_WLOCK_ASSERT(lle); 2094 KASSERT(llt != NULL, ("lltable is NULL")); 2095 2096 /* Unlink entry from table */ 2097 if ((lle->la_flags & LLE_LINKED) != 0) { 2098 2099 ifp = llt->llt_ifp; 2100 IF_AFDATA_WLOCK_ASSERT(ifp); 2101 lltable_unlink_entry(llt, lle); 2102 } 2103 2104 if (callout_stop(&lle->lle_timer) > 0) 2105 LLE_REMREF(lle); 2106 2107 llentry_free(lle); 2108 } 2109 2110 static int 2111 in6_lltable_rtcheck(struct ifnet *ifp, 2112 u_int flags, 2113 const struct sockaddr *l3addr) 2114 { 2115 const struct sockaddr_in6 *sin6; 2116 struct nhop6_basic nh6; 2117 struct in6_addr dst; 2118 uint32_t scopeid; 2119 int error; 2120 char ip6buf[INET6_ADDRSTRLEN]; 2121 int fibnum; 2122 2123 KASSERT(l3addr->sa_family == AF_INET6, 2124 ("sin_family %d", l3addr->sa_family)); 2125 2126 sin6 = (const struct sockaddr_in6 *)l3addr; 2127 in6_splitscope(&sin6->sin6_addr, &dst, &scopeid); 2128 fibnum = V_rt_add_addr_allfibs ? RT_DEFAULT_FIB : ifp->if_fib; 2129 error = fib6_lookup_nh_basic(fibnum, &dst, scopeid, 0, 0, &nh6); 2130 if (error != 0 || (nh6.nh_flags & NHF_GATEWAY) || nh6.nh_ifp != ifp) { 2131 struct ifaddr *ifa; 2132 /* 2133 * Create an ND6 cache for an IPv6 neighbor 2134 * that is not covered by our own prefix. 2135 */ 2136 ifa = ifaof_ifpforaddr(l3addr, ifp); 2137 if (ifa != NULL) { 2138 ifa_free(ifa); 2139 return 0; 2140 } 2141 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2142 ip6_sprintf(ip6buf, &sin6->sin6_addr)); 2143 return EINVAL; 2144 } 2145 return 0; 2146 } 2147 2148 /* 2149 * Called by the datapath to indicate that the entry was used. 2150 */ 2151 static void 2152 in6_lltable_mark_used(struct llentry *lle) 2153 { 2154 2155 LLE_REQ_LOCK(lle); 2156 lle->r_skip_req = 0; 2157 2158 /* 2159 * Set the hit time so the callback function 2160 * can determine the remaining time before 2161 * transiting to the DELAY state. 2162 */ 2163 lle->lle_hittime = time_uptime; 2164 LLE_REQ_UNLOCK(lle); 2165 } 2166 2167 static inline uint32_t 2168 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize) 2169 { 2170 2171 return (IN6_LLTBL_HASH(dst->s6_addr32[3], hsize)); 2172 } 2173 2174 static uint32_t 2175 in6_lltable_hash(const struct llentry *lle, uint32_t hsize) 2176 { 2177 2178 return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize)); 2179 } 2180 2181 static void 2182 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 2183 { 2184 struct sockaddr_in6 *sin6; 2185 2186 sin6 = (struct sockaddr_in6 *)sa; 2187 bzero(sin6, sizeof(*sin6)); 2188 sin6->sin6_family = AF_INET6; 2189 sin6->sin6_len = sizeof(*sin6); 2190 sin6->sin6_addr = lle->r_l3addr.addr6; 2191 } 2192 2193 static inline struct llentry * 2194 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst) 2195 { 2196 struct llentry *lle; 2197 struct llentries *lleh; 2198 u_int hashidx; 2199 2200 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize); 2201 lleh = &llt->lle_head[hashidx]; 2202 LIST_FOREACH(lle, lleh, lle_next) { 2203 if (lle->la_flags & LLE_DELETED) 2204 continue; 2205 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst)) 2206 break; 2207 } 2208 2209 return (lle); 2210 } 2211 2212 static void 2213 in6_lltable_delete_entry(struct lltable *llt, struct llentry *lle) 2214 { 2215 2216 lle->la_flags |= LLE_DELETED; 2217 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 2218 #ifdef DIAGNOSTIC 2219 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2220 #endif 2221 llentry_free(lle); 2222 } 2223 2224 static struct llentry * 2225 in6_lltable_alloc(struct lltable *llt, u_int flags, 2226 const struct sockaddr *l3addr) 2227 { 2228 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2229 struct ifnet *ifp = llt->llt_ifp; 2230 struct llentry *lle; 2231 char linkhdr[LLE_MAX_LINKHDR]; 2232 size_t linkhdrsize; 2233 int lladdr_off; 2234 2235 KASSERT(l3addr->sa_family == AF_INET6, 2236 ("sin_family %d", l3addr->sa_family)); 2237 2238 /* 2239 * A route that covers the given address must have 2240 * been installed 1st because we are doing a resolution, 2241 * verify this. 2242 */ 2243 if (!(flags & LLE_IFADDR) && 2244 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2245 return (NULL); 2246 2247 lle = in6_lltable_new(&sin6->sin6_addr, flags); 2248 if (lle == NULL) { 2249 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2250 return (NULL); 2251 } 2252 lle->la_flags = flags; 2253 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 2254 linkhdrsize = LLE_MAX_LINKHDR; 2255 if (lltable_calc_llheader(ifp, AF_INET6, IF_LLADDR(ifp), 2256 linkhdr, &linkhdrsize, &lladdr_off) != 0) { 2257 in6_lltable_destroy_lle_unlocked(lle); 2258 return (NULL); 2259 } 2260 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize, 2261 lladdr_off); 2262 lle->la_flags |= LLE_STATIC; 2263 } 2264 2265 if ((lle->la_flags & LLE_STATIC) != 0) 2266 lle->ln_state = ND6_LLINFO_REACHABLE; 2267 2268 return (lle); 2269 } 2270 2271 static struct llentry * 2272 in6_lltable_lookup(struct lltable *llt, u_int flags, 2273 const struct sockaddr *l3addr) 2274 { 2275 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2276 struct llentry *lle; 2277 2278 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 2279 KASSERT(l3addr->sa_family == AF_INET6, 2280 ("sin_family %d", l3addr->sa_family)); 2281 2282 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2283 2284 if (lle == NULL) 2285 return (NULL); 2286 2287 KASSERT((flags & (LLE_UNLOCKED|LLE_EXCLUSIVE)) != 2288 (LLE_UNLOCKED|LLE_EXCLUSIVE),("wrong lle request flags: 0x%X", 2289 flags)); 2290 2291 if (flags & LLE_UNLOCKED) 2292 return (lle); 2293 2294 if (flags & LLE_EXCLUSIVE) 2295 LLE_WLOCK(lle); 2296 else 2297 LLE_RLOCK(lle); 2298 return (lle); 2299 } 2300 2301 static int 2302 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 2303 struct sysctl_req *wr) 2304 { 2305 struct ifnet *ifp = llt->llt_ifp; 2306 /* XXX stack use */ 2307 struct { 2308 struct rt_msghdr rtm; 2309 struct sockaddr_in6 sin6; 2310 /* 2311 * ndp.c assumes that sdl is word aligned 2312 */ 2313 #ifdef __LP64__ 2314 uint32_t pad; 2315 #endif 2316 struct sockaddr_dl sdl; 2317 } ndpc; 2318 struct sockaddr_dl *sdl; 2319 int error; 2320 2321 bzero(&ndpc, sizeof(ndpc)); 2322 /* skip deleted entries */ 2323 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 2324 return (0); 2325 /* Skip if jailed and not a valid IP of the prison. */ 2326 lltable_fill_sa_entry(lle, 2327 (struct sockaddr *)&ndpc.sin6); 2328 if (prison_if(wr->td->td_ucred, 2329 (struct sockaddr *)&ndpc.sin6) != 0) 2330 return (0); 2331 /* 2332 * produce a msg made of: 2333 * struct rt_msghdr; 2334 * struct sockaddr_in6 (IPv6) 2335 * struct sockaddr_dl; 2336 */ 2337 ndpc.rtm.rtm_msglen = sizeof(ndpc); 2338 ndpc.rtm.rtm_version = RTM_VERSION; 2339 ndpc.rtm.rtm_type = RTM_GET; 2340 ndpc.rtm.rtm_flags = RTF_UP; 2341 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 2342 if (V_deembed_scopeid) 2343 sa6_recoverscope(&ndpc.sin6); 2344 2345 /* publish */ 2346 if (lle->la_flags & LLE_PUB) 2347 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE; 2348 2349 sdl = &ndpc.sdl; 2350 sdl->sdl_family = AF_LINK; 2351 sdl->sdl_len = sizeof(*sdl); 2352 sdl->sdl_index = ifp->if_index; 2353 sdl->sdl_type = ifp->if_type; 2354 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 2355 sdl->sdl_alen = ifp->if_addrlen; 2356 bcopy(lle->ll_addr, LLADDR(sdl), 2357 ifp->if_addrlen); 2358 } else { 2359 sdl->sdl_alen = 0; 2360 bzero(LLADDR(sdl), ifp->if_addrlen); 2361 } 2362 if (lle->la_expire != 0) 2363 ndpc.rtm.rtm_rmx.rmx_expire = lle->la_expire + 2364 lle->lle_remtime / hz + 2365 time_second - time_uptime; 2366 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 2367 if (lle->la_flags & LLE_STATIC) 2368 ndpc.rtm.rtm_flags |= RTF_STATIC; 2369 if (lle->la_flags & LLE_IFADDR) 2370 ndpc.rtm.rtm_flags |= RTF_PINNED; 2371 if (lle->ln_router != 0) 2372 ndpc.rtm.rtm_flags |= RTF_GATEWAY; 2373 ndpc.rtm.rtm_rmx.rmx_pksent = lle->la_asked; 2374 /* Store state in rmx_weight value */ 2375 ndpc.rtm.rtm_rmx.rmx_state = lle->ln_state; 2376 ndpc.rtm.rtm_index = ifp->if_index; 2377 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc)); 2378 2379 return (error); 2380 } 2381 2382 static struct lltable * 2383 in6_lltattach(struct ifnet *ifp) 2384 { 2385 struct lltable *llt; 2386 2387 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE); 2388 llt->llt_af = AF_INET6; 2389 llt->llt_ifp = ifp; 2390 2391 llt->llt_lookup = in6_lltable_lookup; 2392 llt->llt_alloc_entry = in6_lltable_alloc; 2393 llt->llt_delete_entry = in6_lltable_delete_entry; 2394 llt->llt_dump_entry = in6_lltable_dump_entry; 2395 llt->llt_hash = in6_lltable_hash; 2396 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry; 2397 llt->llt_free_entry = in6_lltable_free_entry; 2398 llt->llt_match_prefix = in6_lltable_match_prefix; 2399 llt->llt_mark_used = in6_lltable_mark_used; 2400 lltable_link(llt); 2401 2402 return (llt); 2403 } 2404 2405 void * 2406 in6_domifattach(struct ifnet *ifp) 2407 { 2408 struct in6_ifextra *ext; 2409 2410 /* There are not IPv6-capable interfaces. */ 2411 switch (ifp->if_type) { 2412 case IFT_PFLOG: 2413 case IFT_PFSYNC: 2414 case IFT_USB: 2415 return (NULL); 2416 } 2417 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2418 bzero(ext, sizeof(*ext)); 2419 2420 ext->in6_ifstat = malloc(sizeof(counter_u64_t) * 2421 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK); 2422 COUNTER_ARRAY_ALLOC(ext->in6_ifstat, 2423 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK); 2424 2425 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) * 2426 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR, 2427 M_WAITOK); 2428 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat, 2429 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK); 2430 2431 ext->nd_ifinfo = nd6_ifattach(ifp); 2432 ext->scope6_id = scope6_ifattach(ifp); 2433 ext->lltable = in6_lltattach(ifp); 2434 2435 ext->mld_ifinfo = mld_domifattach(ifp); 2436 2437 return ext; 2438 } 2439 2440 int 2441 in6_domifmtu(struct ifnet *ifp) 2442 { 2443 if (ifp->if_afdata[AF_INET6] == NULL) 2444 return ifp->if_mtu; 2445 2446 return (IN6_LINKMTU(ifp)); 2447 } 2448 2449 void 2450 in6_domifdetach(struct ifnet *ifp, void *aux) 2451 { 2452 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2453 2454 mld_domifdetach(ifp); 2455 scope6_ifdetach(ext->scope6_id); 2456 nd6_ifdetach(ifp, ext->nd_ifinfo); 2457 lltable_free(ext->lltable); 2458 COUNTER_ARRAY_FREE(ext->in6_ifstat, 2459 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 2460 free(ext->in6_ifstat, M_IFADDR); 2461 COUNTER_ARRAY_FREE(ext->icmp6_ifstat, 2462 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 2463 free(ext->icmp6_ifstat, M_IFADDR); 2464 free(ext, M_IFADDR); 2465 } 2466 2467 /* 2468 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2469 * v4 mapped addr or v4 compat addr 2470 */ 2471 void 2472 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2473 { 2474 2475 bzero(sin, sizeof(*sin)); 2476 sin->sin_len = sizeof(struct sockaddr_in); 2477 sin->sin_family = AF_INET; 2478 sin->sin_port = sin6->sin6_port; 2479 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2480 } 2481 2482 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2483 void 2484 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2485 { 2486 bzero(sin6, sizeof(*sin6)); 2487 sin6->sin6_len = sizeof(struct sockaddr_in6); 2488 sin6->sin6_family = AF_INET6; 2489 sin6->sin6_port = sin->sin_port; 2490 sin6->sin6_addr.s6_addr32[0] = 0; 2491 sin6->sin6_addr.s6_addr32[1] = 0; 2492 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2493 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2494 } 2495 2496 /* Convert sockaddr_in6 into sockaddr_in. */ 2497 void 2498 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2499 { 2500 struct sockaddr_in *sin_p; 2501 struct sockaddr_in6 sin6; 2502 2503 /* 2504 * Save original sockaddr_in6 addr and convert it 2505 * to sockaddr_in. 2506 */ 2507 sin6 = *(struct sockaddr_in6 *)nam; 2508 sin_p = (struct sockaddr_in *)nam; 2509 in6_sin6_2_sin(sin_p, &sin6); 2510 } 2511 2512 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2513 void 2514 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2515 { 2516 struct sockaddr_in *sin_p; 2517 struct sockaddr_in6 *sin6_p; 2518 2519 sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK); 2520 sin_p = (struct sockaddr_in *)*nam; 2521 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2522 free(*nam, M_SONAME); 2523 *nam = (struct sockaddr *)sin6_p; 2524 } 2525