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/protosw.h> 83 #include <sys/time.h> 84 #include <sys/kernel.h> 85 #include <sys/lock.h> 86 #include <sys/rmlock.h> 87 #include <sys/sysctl.h> 88 #include <sys/syslog.h> 89 90 #include <net/if.h> 91 #include <net/if_var.h> 92 #include <net/if_types.h> 93 #include <net/route.h> 94 #include <net/if_dl.h> 95 #include <net/vnet.h> 96 97 #include <netinet/in.h> 98 #include <netinet/in_var.h> 99 #include <net/if_llatbl.h> 100 #include <netinet/if_ether.h> 101 #include <netinet/in_systm.h> 102 #include <netinet/ip.h> 103 #include <netinet/in_pcb.h> 104 #include <netinet/ip_carp.h> 105 106 #include <netinet/ip6.h> 107 #include <netinet6/ip6_var.h> 108 #include <netinet6/nd6.h> 109 #include <netinet6/mld6_var.h> 110 #include <netinet6/ip6_mroute.h> 111 #include <netinet6/in6_ifattach.h> 112 #include <netinet6/scope6_var.h> 113 #include <netinet6/in6_fib.h> 114 #include <netinet6/in6_pcb.h> 115 116 117 /* 118 * struct in6_ifreq and struct ifreq must be type punnable for common members 119 * of ifr_ifru to allow accessors to be shared. 120 */ 121 _Static_assert(offsetof(struct in6_ifreq, ifr_ifru) == 122 offsetof(struct ifreq, ifr_ifru), 123 "struct in6_ifreq and struct ifreq are not type punnable"); 124 125 VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix); 126 #define V_icmp6_nodeinfo_oldmcprefix VNET(icmp6_nodeinfo_oldmcprefix) 127 128 /* 129 * Definitions of some costant IP6 addresses. 130 */ 131 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 132 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 133 const struct in6_addr in6addr_nodelocal_allnodes = 134 IN6ADDR_NODELOCAL_ALLNODES_INIT; 135 const struct in6_addr in6addr_linklocal_allnodes = 136 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 137 const struct in6_addr in6addr_linklocal_allrouters = 138 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 139 const struct in6_addr in6addr_linklocal_allv2routers = 140 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT; 141 142 const struct in6_addr in6mask0 = IN6MASK0; 143 const struct in6_addr in6mask32 = IN6MASK32; 144 const struct in6_addr in6mask64 = IN6MASK64; 145 const struct in6_addr in6mask96 = IN6MASK96; 146 const struct in6_addr in6mask128 = IN6MASK128; 147 148 const struct sockaddr_in6 sa6_any = 149 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 }; 150 151 static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *, 152 struct in6_aliasreq *, int); 153 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 154 155 static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *, 156 struct in6_ifaddr *, int); 157 static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *, 158 struct in6_aliasreq *, int flags); 159 static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *, 160 struct in6_ifaddr *, int, int); 161 static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *, 162 struct in6_ifaddr *, int); 163 164 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 165 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 166 167 168 void 169 in6_newaddrmsg(struct in6_ifaddr *ia, int cmd) 170 { 171 struct sockaddr_dl gateway; 172 struct sockaddr_in6 mask, addr; 173 struct rtentry rt; 174 int fibnum; 175 176 /* 177 * initialize for rtmsg generation 178 */ 179 bzero(&gateway, sizeof(gateway)); 180 gateway.sdl_len = sizeof(gateway); 181 gateway.sdl_family = AF_LINK; 182 183 bzero(&rt, sizeof(rt)); 184 rt.rt_gateway = (struct sockaddr *)&gateway; 185 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 186 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr)); 187 rt_mask(&rt) = (struct sockaddr *)&mask; 188 rt_key(&rt) = (struct sockaddr *)&addr; 189 rt.rt_flags = RTF_HOST | RTF_STATIC; 190 if (cmd == RTM_ADD) 191 rt.rt_flags |= RTF_UP; 192 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS : ia62ifa(ia)->ifa_ifp->if_fib; 193 /* Announce arrival of local address to this FIB. */ 194 rt_newaddrmsg_fib(cmd, &ia->ia_ifa, 0, &rt, fibnum); 195 } 196 197 int 198 in6_mask2len(struct in6_addr *mask, u_char *lim0) 199 { 200 int x = 0, y; 201 u_char *lim = lim0, *p; 202 203 /* ignore the scope_id part */ 204 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 205 lim = (u_char *)mask + sizeof(*mask); 206 for (p = (u_char *)mask; p < lim; x++, p++) { 207 if (*p != 0xff) 208 break; 209 } 210 y = 0; 211 if (p < lim) { 212 for (y = 0; y < 8; y++) { 213 if ((*p & (0x80 >> y)) == 0) 214 break; 215 } 216 } 217 218 /* 219 * when the limit pointer is given, do a stricter check on the 220 * remaining bits. 221 */ 222 if (p < lim) { 223 if (y != 0 && (*p & (0x00ff >> y)) != 0) 224 return (-1); 225 for (p = p + 1; p < lim; p++) 226 if (*p != 0) 227 return (-1); 228 } 229 230 return x * 8 + y; 231 } 232 233 #ifdef COMPAT_FREEBSD32 234 struct in6_ndifreq32 { 235 char ifname[IFNAMSIZ]; 236 uint32_t ifindex; 237 }; 238 #define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32) 239 #endif 240 241 int 242 in6_control(struct socket *so, u_long cmd, caddr_t data, 243 struct ifnet *ifp, struct thread *td) 244 { 245 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 246 struct in6_ifaddr *ia = NULL; 247 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 248 struct sockaddr_in6 *sa6; 249 int carp_attached = 0; 250 int error; 251 u_long ocmd = cmd; 252 253 /* 254 * Compat to make pre-10.x ifconfig(8) operable. 255 */ 256 if (cmd == OSIOCAIFADDR_IN6) 257 cmd = SIOCAIFADDR_IN6; 258 259 switch (cmd) { 260 case SIOCGETSGCNT_IN6: 261 case SIOCGETMIFCNT_IN6: 262 /* 263 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c. 264 * We cannot see how that would be needed, so do not adjust the 265 * KPI blindly; more likely should clean up the IPv4 variant. 266 */ 267 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP); 268 } 269 270 switch (cmd) { 271 case SIOCAADDRCTL_POLICY: 272 case SIOCDADDRCTL_POLICY: 273 if (td != NULL) { 274 error = priv_check(td, PRIV_NETINET_ADDRCTRL6); 275 if (error) 276 return (error); 277 } 278 return (in6_src_ioctl(cmd, data)); 279 } 280 281 if (ifp == NULL) 282 return (EOPNOTSUPP); 283 284 switch (cmd) { 285 case SIOCSNDFLUSH_IN6: 286 case SIOCSPFXFLUSH_IN6: 287 case SIOCSRTRFLUSH_IN6: 288 case SIOCSDEFIFACE_IN6: 289 case SIOCSIFINFO_FLAGS: 290 case SIOCSIFINFO_IN6: 291 if (td != NULL) { 292 error = priv_check(td, PRIV_NETINET_ND6); 293 if (error) 294 return (error); 295 } 296 /* FALLTHROUGH */ 297 case OSIOCGIFINFO_IN6: 298 case SIOCGIFINFO_IN6: 299 case SIOCGNBRINFO_IN6: 300 case SIOCGDEFIFACE_IN6: 301 return (nd6_ioctl(cmd, data, ifp)); 302 303 #ifdef COMPAT_FREEBSD32 304 case SIOCGDEFIFACE32_IN6: 305 { 306 struct in6_ndifreq ndif; 307 struct in6_ndifreq32 *ndif32; 308 309 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif, 310 ifp); 311 if (error) 312 return (error); 313 ndif32 = (struct in6_ndifreq32 *)data; 314 ndif32->ifindex = ndif.ifindex; 315 return (0); 316 } 317 #endif 318 } 319 320 switch (cmd) { 321 case SIOCSIFPREFIX_IN6: 322 case SIOCDIFPREFIX_IN6: 323 case SIOCAIFPREFIX_IN6: 324 case SIOCCIFPREFIX_IN6: 325 case SIOCSGIFPREFIX_IN6: 326 case SIOCGIFPREFIX_IN6: 327 log(LOG_NOTICE, 328 "prefix ioctls are now invalidated. " 329 "please use ifconfig.\n"); 330 return (EOPNOTSUPP); 331 } 332 333 switch (cmd) { 334 case SIOCSSCOPE6: 335 if (td != NULL) { 336 error = priv_check(td, PRIV_NETINET_SCOPE6); 337 if (error) 338 return (error); 339 } 340 /* FALLTHROUGH */ 341 case SIOCGSCOPE6: 342 case SIOCGSCOPE6DEF: 343 return (scope6_ioctl(cmd, data, ifp)); 344 } 345 346 /* 347 * Find address for this interface, if it exists. 348 * 349 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 350 * only, and used the first interface address as the target of other 351 * operations (without checking ifra_addr). This was because netinet 352 * code/API assumed at most 1 interface address per interface. 353 * Since IPv6 allows a node to assign multiple addresses 354 * on a single interface, we almost always look and check the 355 * presence of ifra_addr, and reject invalid ones here. 356 * It also decreases duplicated code among SIOC*_IN6 operations. 357 */ 358 switch (cmd) { 359 case SIOCAIFADDR_IN6: 360 case SIOCSIFPHYADDR_IN6: 361 sa6 = &ifra->ifra_addr; 362 break; 363 case SIOCSIFADDR_IN6: 364 case SIOCGIFADDR_IN6: 365 case SIOCSIFDSTADDR_IN6: 366 case SIOCSIFNETMASK_IN6: 367 case SIOCGIFDSTADDR_IN6: 368 case SIOCGIFNETMASK_IN6: 369 case SIOCDIFADDR_IN6: 370 case SIOCGIFPSRCADDR_IN6: 371 case SIOCGIFPDSTADDR_IN6: 372 case SIOCGIFAFLAG_IN6: 373 case SIOCSNDFLUSH_IN6: 374 case SIOCSPFXFLUSH_IN6: 375 case SIOCSRTRFLUSH_IN6: 376 case SIOCGIFALIFETIME_IN6: 377 case SIOCGIFSTAT_IN6: 378 case SIOCGIFSTAT_ICMP6: 379 sa6 = &ifr->ifr_addr; 380 break; 381 case SIOCSIFADDR: 382 case SIOCSIFBRDADDR: 383 case SIOCSIFDSTADDR: 384 case SIOCSIFNETMASK: 385 /* 386 * Although we should pass any non-INET6 ioctl requests 387 * down to driver, we filter some legacy INET requests. 388 * Drivers trust SIOCSIFADDR et al to come from an already 389 * privileged layer, and do not perform any credentials 390 * checks or input validation. 391 */ 392 return (EINVAL); 393 default: 394 sa6 = NULL; 395 break; 396 } 397 if (sa6 && sa6->sin6_family == AF_INET6) { 398 if (sa6->sin6_scope_id != 0) 399 error = sa6_embedscope(sa6, 0); 400 else 401 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 402 if (error != 0) 403 return (error); 404 if (td != NULL && (error = prison_check_ip6(td->td_ucred, 405 &sa6->sin6_addr)) != 0) 406 return (error); 407 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 408 } else 409 ia = NULL; 410 411 switch (cmd) { 412 case SIOCSIFADDR_IN6: 413 case SIOCSIFDSTADDR_IN6: 414 case SIOCSIFNETMASK_IN6: 415 /* 416 * Since IPv6 allows a node to assign multiple addresses 417 * on a single interface, SIOCSIFxxx ioctls are deprecated. 418 */ 419 /* we decided to obsolete this command (20000704) */ 420 error = EINVAL; 421 goto out; 422 423 case SIOCDIFADDR_IN6: 424 /* 425 * for IPv4, we look for existing in_ifaddr here to allow 426 * "ifconfig if0 delete" to remove the first IPv4 address on 427 * the interface. For IPv6, as the spec allows multiple 428 * interface address from the day one, we consider "remove the 429 * first one" semantics to be not preferable. 430 */ 431 if (ia == NULL) { 432 error = EADDRNOTAVAIL; 433 goto out; 434 } 435 /* FALLTHROUGH */ 436 case SIOCAIFADDR_IN6: 437 /* 438 * We always require users to specify a valid IPv6 address for 439 * the corresponding operation. 440 */ 441 if (ifra->ifra_addr.sin6_family != AF_INET6 || 442 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 443 error = EAFNOSUPPORT; 444 goto out; 445 } 446 447 if (td != NULL) { 448 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 449 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR); 450 if (error) 451 goto out; 452 } 453 /* FALLTHROUGH */ 454 case SIOCGIFSTAT_IN6: 455 case SIOCGIFSTAT_ICMP6: 456 if (ifp->if_afdata[AF_INET6] == NULL) { 457 error = EPFNOSUPPORT; 458 goto out; 459 } 460 break; 461 462 case SIOCGIFADDR_IN6: 463 /* This interface is basically deprecated. use SIOCGIFCONF. */ 464 /* FALLTHROUGH */ 465 case SIOCGIFAFLAG_IN6: 466 case SIOCGIFNETMASK_IN6: 467 case SIOCGIFDSTADDR_IN6: 468 case SIOCGIFALIFETIME_IN6: 469 /* must think again about its semantics */ 470 if (ia == NULL) { 471 error = EADDRNOTAVAIL; 472 goto out; 473 } 474 break; 475 } 476 477 switch (cmd) { 478 case SIOCGIFADDR_IN6: 479 ifr->ifr_addr = ia->ia_addr; 480 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 481 goto out; 482 break; 483 484 case SIOCGIFDSTADDR_IN6: 485 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 486 error = EINVAL; 487 goto out; 488 } 489 ifr->ifr_dstaddr = ia->ia_dstaddr; 490 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 491 goto out; 492 break; 493 494 case SIOCGIFNETMASK_IN6: 495 ifr->ifr_addr = ia->ia_prefixmask; 496 break; 497 498 case SIOCGIFAFLAG_IN6: 499 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 500 break; 501 502 case SIOCGIFSTAT_IN6: 503 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 504 ifp->if_afdata[AF_INET6])->in6_ifstat, 505 &ifr->ifr_ifru.ifru_stat, 506 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 507 break; 508 509 case SIOCGIFSTAT_ICMP6: 510 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 511 ifp->if_afdata[AF_INET6])->icmp6_ifstat, 512 &ifr->ifr_ifru.ifru_icmp6stat, 513 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 514 break; 515 516 case SIOCGIFALIFETIME_IN6: 517 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 518 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 519 time_t maxexpire; 520 struct in6_addrlifetime *retlt = 521 &ifr->ifr_ifru.ifru_lifetime; 522 523 /* 524 * XXX: adjust expiration time assuming time_t is 525 * signed. 526 */ 527 maxexpire = (-1) & 528 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 529 if (ia->ia6_lifetime.ia6t_vltime < 530 maxexpire - ia->ia6_updatetime) { 531 retlt->ia6t_expire = ia->ia6_updatetime + 532 ia->ia6_lifetime.ia6t_vltime; 533 } else 534 retlt->ia6t_expire = maxexpire; 535 } 536 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 537 time_t maxexpire; 538 struct in6_addrlifetime *retlt = 539 &ifr->ifr_ifru.ifru_lifetime; 540 541 /* 542 * XXX: adjust expiration time assuming time_t is 543 * signed. 544 */ 545 maxexpire = (-1) & 546 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 547 if (ia->ia6_lifetime.ia6t_pltime < 548 maxexpire - ia->ia6_updatetime) { 549 retlt->ia6t_preferred = ia->ia6_updatetime + 550 ia->ia6_lifetime.ia6t_pltime; 551 } else 552 retlt->ia6t_preferred = maxexpire; 553 } 554 break; 555 556 case SIOCAIFADDR_IN6: 557 { 558 struct nd_prefixctl pr0; 559 struct nd_prefix *pr; 560 561 /* 562 * first, make or update the interface address structure, 563 * and link it to the list. 564 */ 565 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 566 goto out; 567 if (ia != NULL) { 568 if (ia->ia_ifa.ifa_carp) 569 (*carp_detach_p)(&ia->ia_ifa, true); 570 ifa_free(&ia->ia_ifa); 571 } 572 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 573 == NULL) { 574 /* 575 * this can happen when the user specify the 0 valid 576 * lifetime. 577 */ 578 break; 579 } 580 581 if (cmd == ocmd && ifra->ifra_vhid > 0) { 582 if (carp_attach_p != NULL) 583 error = (*carp_attach_p)(&ia->ia_ifa, 584 ifra->ifra_vhid); 585 else 586 error = EPROTONOSUPPORT; 587 if (error) 588 goto out; 589 else 590 carp_attached = 1; 591 } 592 593 /* 594 * then, make the prefix on-link on the interface. 595 * XXX: we'd rather create the prefix before the address, but 596 * we need at least one address to install the corresponding 597 * interface route, so we configure the address first. 598 */ 599 600 /* 601 * convert mask to prefix length (prefixmask has already 602 * been validated in in6_update_ifa(). 603 */ 604 bzero(&pr0, sizeof(pr0)); 605 pr0.ndpr_ifp = ifp; 606 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 607 NULL); 608 if (pr0.ndpr_plen == 128) { 609 /* we don't need to install a host route. */ 610 goto aifaddr_out; 611 } 612 pr0.ndpr_prefix = ifra->ifra_addr; 613 /* apply the mask for safety. */ 614 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, 615 &ifra->ifra_prefixmask.sin6_addr); 616 617 /* 618 * XXX: since we don't have an API to set prefix (not address) 619 * lifetimes, we just use the same lifetimes as addresses. 620 * The (temporarily) installed lifetimes can be overridden by 621 * later advertised RAs (when accept_rtadv is non 0), which is 622 * an intended behavior. 623 */ 624 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 625 pr0.ndpr_raf_auto = 626 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 627 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 628 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 629 630 /* add the prefix if not yet. */ 631 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 632 /* 633 * nd6_prelist_add will install the corresponding 634 * interface route. 635 */ 636 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) { 637 if (carp_attached) 638 (*carp_detach_p)(&ia->ia_ifa, false); 639 goto out; 640 } 641 } 642 643 /* relate the address to the prefix */ 644 if (ia->ia6_ndpr == NULL) { 645 ia->ia6_ndpr = pr; 646 pr->ndpr_addrcnt++; 647 648 /* 649 * If this is the first autoconf address from the 650 * prefix, create a temporary address as well 651 * (when required). 652 */ 653 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 654 V_ip6_use_tempaddr && pr->ndpr_addrcnt == 1) { 655 int e; 656 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 657 log(LOG_NOTICE, "in6_control: failed " 658 "to create a temporary address, " 659 "errno=%d\n", e); 660 } 661 } 662 } 663 nd6_prefix_rele(pr); 664 665 /* 666 * this might affect the status of autoconfigured addresses, 667 * that is, this address might make other addresses detached. 668 */ 669 pfxlist_onlink_check(); 670 671 aifaddr_out: 672 /* 673 * Try to clear the flag when a new IPv6 address is added 674 * onto an IFDISABLED interface and it succeeds. 675 */ 676 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) { 677 struct in6_ndireq nd; 678 679 memset(&nd, 0, sizeof(nd)); 680 nd.ndi.flags = ND_IFINFO(ifp)->flags; 681 nd.ndi.flags &= ~ND6_IFF_IFDISABLED; 682 if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0) 683 log(LOG_NOTICE, "SIOCAIFADDR_IN6: " 684 "SIOCSIFINFO_FLAGS for -ifdisabled " 685 "failed."); 686 /* 687 * Ignore failure of clearing the flag intentionally. 688 * The failure means address duplication was detected. 689 */ 690 } 691 break; 692 } 693 694 case SIOCDIFADDR_IN6: 695 { 696 struct nd_prefix *pr; 697 698 /* 699 * If the address being deleted is the only one that owns 700 * the corresponding prefix, expire the prefix as well. 701 * XXX: theoretically, we don't have to worry about such 702 * relationship, since we separate the address management 703 * and the prefix management. We do this, however, to provide 704 * as much backward compatibility as possible in terms of 705 * the ioctl operation. 706 * Note that in6_purgeaddr() will decrement ndpr_addrcnt. 707 */ 708 pr = ia->ia6_ndpr; 709 in6_purgeaddr(&ia->ia_ifa); 710 if (pr != NULL && pr->ndpr_addrcnt == 0) { 711 ND6_WLOCK(); 712 nd6_prefix_unlink(pr, NULL); 713 ND6_WUNLOCK(); 714 nd6_prefix_del(pr); 715 } 716 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa, 717 IFADDR_EVENT_DEL); 718 break; 719 } 720 721 default: 722 if (ifp->if_ioctl == NULL) { 723 error = EOPNOTSUPP; 724 goto out; 725 } 726 error = (*ifp->if_ioctl)(ifp, cmd, data); 727 goto out; 728 } 729 730 error = 0; 731 out: 732 if (ia != NULL) 733 ifa_free(&ia->ia_ifa); 734 return (error); 735 } 736 737 738 static struct in6_multi_mship * 739 in6_joingroup_legacy(struct ifnet *ifp, const struct in6_addr *mcaddr, 740 int *errorp, int delay) 741 { 742 struct in6_multi_mship *imm; 743 int error; 744 745 imm = malloc(sizeof(*imm), M_IP6MADDR, M_NOWAIT); 746 if (imm == NULL) { 747 *errorp = ENOBUFS; 748 return (NULL); 749 } 750 751 delay = (delay * PR_FASTHZ) / hz; 752 753 error = in6_joingroup(ifp, mcaddr, NULL, &imm->i6mm_maddr, delay); 754 if (error) { 755 *errorp = error; 756 free(imm, M_IP6MADDR); 757 return (NULL); 758 } 759 760 return (imm); 761 } 762 /* 763 * Join necessary multicast groups. Factored out from in6_update_ifa(). 764 * This entire work should only be done once, for the default FIB. 765 */ 766 static int 767 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra, 768 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol) 769 { 770 char ip6buf[INET6_ADDRSTRLEN]; 771 struct in6_addr mltaddr; 772 struct in6_multi_mship *imm; 773 int delay, error; 774 775 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__)); 776 777 /* Join solicited multicast addr for new host id. */ 778 bzero(&mltaddr, sizeof(struct in6_addr)); 779 mltaddr.s6_addr32[0] = IPV6_ADDR_INT32_MLL; 780 mltaddr.s6_addr32[2] = htonl(1); 781 mltaddr.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 782 mltaddr.s6_addr8[12] = 0xff; 783 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) { 784 /* XXX: should not happen */ 785 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 786 goto cleanup; 787 } 788 delay = error = 0; 789 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 790 /* 791 * We need a random delay for DAD on the address being 792 * configured. It also means delaying transmission of the 793 * corresponding MLD report to avoid report collision. 794 * [RFC 4861, Section 6.3.7] 795 */ 796 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 797 } 798 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay); 799 if (imm == NULL) { 800 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 801 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 802 if_name(ifp), error)); 803 goto cleanup; 804 } 805 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 806 *in6m_sol = imm->i6mm_maddr; 807 808 /* 809 * Join link-local all-nodes address. 810 */ 811 mltaddr = in6addr_linklocal_allnodes; 812 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 813 goto cleanup; /* XXX: should not fail */ 814 815 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, 0); 816 if (imm == NULL) { 817 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 818 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 819 if_name(ifp), error)); 820 goto cleanup; 821 } 822 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 823 824 /* 825 * Join node information group address. 826 */ 827 delay = 0; 828 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 829 /* 830 * The spec does not say anything about delay for this group, 831 * but the same logic should apply. 832 */ 833 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 834 } 835 if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) { 836 /* XXX jinmei */ 837 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay); 838 if (imm == NULL) 839 nd6log((LOG_WARNING, 840 "%s: in6_joingroup failed for %s on %s " 841 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 842 &mltaddr), if_name(ifp), error)); 843 /* XXX not very fatal, go on... */ 844 else 845 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 846 } 847 if (V_icmp6_nodeinfo_oldmcprefix && 848 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) { 849 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay); 850 if (imm == NULL) 851 nd6log((LOG_WARNING, 852 "%s: in6_joingroup failed for %s on %s " 853 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 854 &mltaddr), if_name(ifp), error)); 855 /* XXX not very fatal, go on... */ 856 else 857 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 858 } 859 860 /* 861 * Join interface-local all-nodes address. 862 * (ff01::1%ifN, and ff01::%ifN/32) 863 */ 864 mltaddr = in6addr_nodelocal_allnodes; 865 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 866 goto cleanup; /* XXX: should not fail */ 867 868 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, 0); 869 if (imm == NULL) { 870 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 871 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 872 &mltaddr), if_name(ifp), error)); 873 goto cleanup; 874 } 875 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 876 877 cleanup: 878 return (error); 879 } 880 881 /* 882 * Update parameters of an IPv6 interface address. 883 * If necessary, a new entry is created and linked into address chains. 884 * This function is separated from in6_control(). 885 */ 886 int 887 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 888 struct in6_ifaddr *ia, int flags) 889 { 890 int error, hostIsNew = 0; 891 892 if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0) 893 return (error); 894 895 if (ia == NULL) { 896 hostIsNew = 1; 897 if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL) 898 return (ENOBUFS); 899 } 900 901 error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags); 902 if (error != 0) { 903 if (hostIsNew != 0) { 904 in6_unlink_ifa(ia, ifp); 905 ifa_free(&ia->ia_ifa); 906 } 907 return (error); 908 } 909 910 if (hostIsNew) 911 error = in6_broadcast_ifa(ifp, ifra, ia, flags); 912 913 return (error); 914 } 915 916 /* 917 * Fill in basic IPv6 address request info. 918 */ 919 void 920 in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr, 921 const struct in6_addr *mask) 922 { 923 924 memset(ifra, 0, sizeof(struct in6_aliasreq)); 925 926 ifra->ifra_addr.sin6_family = AF_INET6; 927 ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 928 if (addr != NULL) 929 ifra->ifra_addr.sin6_addr = *addr; 930 931 ifra->ifra_prefixmask.sin6_family = AF_INET6; 932 ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 933 if (mask != NULL) 934 ifra->ifra_prefixmask.sin6_addr = *mask; 935 } 936 937 static int 938 in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra, 939 struct in6_ifaddr *ia, int flags) 940 { 941 int plen = -1; 942 struct sockaddr_in6 dst6; 943 struct in6_addrlifetime *lt; 944 char ip6buf[INET6_ADDRSTRLEN]; 945 946 /* Validate parameters */ 947 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 948 return (EINVAL); 949 950 /* 951 * The destination address for a p2p link must have a family 952 * of AF_UNSPEC or AF_INET6. 953 */ 954 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 955 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 956 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 957 return (EAFNOSUPPORT); 958 959 /* 960 * Validate address 961 */ 962 if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) || 963 ifra->ifra_addr.sin6_family != AF_INET6) 964 return (EINVAL); 965 966 /* 967 * validate ifra_prefixmask. don't check sin6_family, netmask 968 * does not carry fields other than sin6_len. 969 */ 970 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 971 return (EINVAL); 972 /* 973 * Because the IPv6 address architecture is classless, we require 974 * users to specify a (non 0) prefix length (mask) for a new address. 975 * We also require the prefix (when specified) mask is valid, and thus 976 * reject a non-consecutive mask. 977 */ 978 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 979 return (EINVAL); 980 if (ifra->ifra_prefixmask.sin6_len != 0) { 981 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 982 (u_char *)&ifra->ifra_prefixmask + 983 ifra->ifra_prefixmask.sin6_len); 984 if (plen <= 0) 985 return (EINVAL); 986 } else { 987 /* 988 * In this case, ia must not be NULL. We just use its prefix 989 * length. 990 */ 991 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 992 } 993 /* 994 * If the destination address on a p2p interface is specified, 995 * and the address is a scoped one, validate/set the scope 996 * zone identifier. 997 */ 998 dst6 = ifra->ifra_dstaddr; 999 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 1000 (dst6.sin6_family == AF_INET6)) { 1001 struct in6_addr in6_tmp; 1002 u_int32_t zoneid; 1003 1004 in6_tmp = dst6.sin6_addr; 1005 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 1006 return (EINVAL); /* XXX: should be impossible */ 1007 1008 if (dst6.sin6_scope_id != 0) { 1009 if (dst6.sin6_scope_id != zoneid) 1010 return (EINVAL); 1011 } else /* user omit to specify the ID. */ 1012 dst6.sin6_scope_id = zoneid; 1013 1014 /* convert into the internal form */ 1015 if (sa6_embedscope(&dst6, 0)) 1016 return (EINVAL); /* XXX: should be impossible */ 1017 } 1018 /* Modify original ifra_dstaddr to reflect changes */ 1019 ifra->ifra_dstaddr = dst6; 1020 1021 /* 1022 * The destination address can be specified only for a p2p or a 1023 * loopback interface. If specified, the corresponding prefix length 1024 * must be 128. 1025 */ 1026 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 1027 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 1028 /* XXX: noisy message */ 1029 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 1030 "be specified for a p2p or a loopback IF only\n")); 1031 return (EINVAL); 1032 } 1033 if (plen != 128) { 1034 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 1035 "be 128 when dstaddr is specified\n")); 1036 return (EINVAL); 1037 } 1038 } 1039 /* lifetime consistency check */ 1040 lt = &ifra->ifra_lifetime; 1041 if (lt->ia6t_pltime > lt->ia6t_vltime) 1042 return (EINVAL); 1043 if (lt->ia6t_vltime == 0) { 1044 /* 1045 * the following log might be noisy, but this is a typical 1046 * configuration mistake or a tool's bug. 1047 */ 1048 nd6log((LOG_INFO, 1049 "in6_update_ifa: valid lifetime is 0 for %s\n", 1050 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr))); 1051 1052 if (ia == NULL) 1053 return (0); /* there's nothing to do */ 1054 } 1055 1056 /* Check prefix mask */ 1057 if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) { 1058 /* 1059 * We prohibit changing the prefix length of an existing 1060 * address, because 1061 * + such an operation should be rare in IPv6, and 1062 * + the operation would confuse prefix management. 1063 */ 1064 if (ia->ia_prefixmask.sin6_len != 0 && 1065 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 1066 nd6log((LOG_INFO, "in6_validate_ifa: the prefix length " 1067 "of an existing %s address should not be changed\n", 1068 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1069 1070 return (EINVAL); 1071 } 1072 } 1073 1074 return (0); 1075 } 1076 1077 1078 /* 1079 * Allocate a new ifaddr and link it into chains. 1080 */ 1081 static struct in6_ifaddr * 1082 in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags) 1083 { 1084 struct in6_ifaddr *ia; 1085 1086 /* 1087 * When in6_alloc_ifa() is called in a process of a received 1088 * RA, it is called under an interrupt context. So, we should 1089 * call malloc with M_NOWAIT. 1090 */ 1091 ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT); 1092 if (ia == NULL) 1093 return (NULL); 1094 LIST_INIT(&ia->ia6_memberships); 1095 /* Initialize the address and masks, and put time stamp */ 1096 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1097 ia->ia_addr.sin6_family = AF_INET6; 1098 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 1099 /* XXX: Can we assign ,sin6_addr and skip the rest? */ 1100 ia->ia_addr = ifra->ifra_addr; 1101 ia->ia6_createtime = time_uptime; 1102 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1103 /* 1104 * Some functions expect that ifa_dstaddr is not 1105 * NULL for p2p interfaces. 1106 */ 1107 ia->ia_ifa.ifa_dstaddr = 1108 (struct sockaddr *)&ia->ia_dstaddr; 1109 } else { 1110 ia->ia_ifa.ifa_dstaddr = NULL; 1111 } 1112 1113 /* set prefix mask if any */ 1114 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 1115 if (ifra->ifra_prefixmask.sin6_len != 0) { 1116 ia->ia_prefixmask.sin6_family = AF_INET6; 1117 ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len; 1118 ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr; 1119 } 1120 1121 ia->ia_ifp = ifp; 1122 ifa_ref(&ia->ia_ifa); /* if_addrhead */ 1123 IF_ADDR_WLOCK(ifp); 1124 CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1125 IF_ADDR_WUNLOCK(ifp); 1126 1127 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */ 1128 IN6_IFADDR_WLOCK(); 1129 CK_STAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link); 1130 CK_LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash); 1131 IN6_IFADDR_WUNLOCK(); 1132 1133 return (ia); 1134 } 1135 1136 /* 1137 * Update/configure interface address parameters: 1138 * 1139 * 1) Update lifetime 1140 * 2) Update interface metric ad flags 1141 * 3) Notify other subsystems 1142 */ 1143 static int 1144 in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra, 1145 struct in6_ifaddr *ia, int hostIsNew, int flags) 1146 { 1147 int error; 1148 1149 /* update timestamp */ 1150 ia->ia6_updatetime = time_uptime; 1151 1152 /* 1153 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1154 * to see if the address is deprecated or invalidated, but initialize 1155 * these members for applications. 1156 */ 1157 ia->ia6_lifetime = ifra->ifra_lifetime; 1158 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1159 ia->ia6_lifetime.ia6t_expire = 1160 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1161 } else 1162 ia->ia6_lifetime.ia6t_expire = 0; 1163 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1164 ia->ia6_lifetime.ia6t_preferred = 1165 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1166 } else 1167 ia->ia6_lifetime.ia6t_preferred = 0; 1168 1169 /* 1170 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1171 * userland, make it deprecated. 1172 */ 1173 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1174 ia->ia6_lifetime.ia6t_pltime = 0; 1175 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1176 } 1177 1178 /* 1179 * configure address flags. 1180 */ 1181 ia->ia6_flags = ifra->ifra_flags; 1182 1183 /* 1184 * Make the address tentative before joining multicast addresses, 1185 * so that corresponding MLD responses would not have a tentative 1186 * source address. 1187 */ 1188 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1189 1190 /* 1191 * DAD should be performed for an new address or addresses on 1192 * an interface with ND6_IFF_IFDISABLED. 1193 */ 1194 if (in6if_do_dad(ifp) && 1195 (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED))) 1196 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1197 1198 /* notify other subsystems */ 1199 error = in6_notify_ifa(ifp, ia, ifra, hostIsNew); 1200 1201 return (error); 1202 } 1203 1204 /* 1205 * Do link-level ifa job: 1206 * 1) Add lle entry for added address 1207 * 2) Notifies routing socket users about new address 1208 * 3) join appropriate multicast group 1209 * 4) start DAD if enabled 1210 */ 1211 static int 1212 in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1213 struct in6_ifaddr *ia, int flags) 1214 { 1215 struct in6_multi *in6m_sol; 1216 int error = 0; 1217 1218 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1219 if ((error = nd6_add_ifa_lle(ia)) != 0) { 1220 in6_purgeaddr(&ia->ia_ifa); 1221 ifa_free(&ia->ia_ifa); 1222 return (error); 1223 } 1224 1225 /* Join necessary multicast groups. */ 1226 in6m_sol = NULL; 1227 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1228 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol); 1229 if (error != 0) { 1230 in6_purgeaddr(&ia->ia_ifa); 1231 ifa_free(&ia->ia_ifa); 1232 return (error); 1233 } 1234 } 1235 1236 /* Perform DAD, if the address is TENTATIVE. */ 1237 if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) { 1238 int delay, mindelay, maxdelay; 1239 1240 delay = 0; 1241 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1242 /* 1243 * We need to impose a delay before sending an NS 1244 * for DAD. Check if we also needed a delay for the 1245 * corresponding MLD message. If we did, the delay 1246 * should be larger than the MLD delay (this could be 1247 * relaxed a bit, but this simple logic is at least 1248 * safe). 1249 * XXX: Break data hiding guidelines and look at 1250 * state for the solicited multicast group. 1251 */ 1252 mindelay = 0; 1253 if (in6m_sol != NULL && 1254 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) { 1255 mindelay = in6m_sol->in6m_timer; 1256 } 1257 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1258 if (maxdelay - mindelay == 0) 1259 delay = 0; 1260 else { 1261 delay = 1262 (arc4random() % (maxdelay - mindelay)) + 1263 mindelay; 1264 } 1265 } 1266 nd6_dad_start((struct ifaddr *)ia, delay); 1267 } 1268 1269 in6_newaddrmsg(ia, RTM_ADD); 1270 ifa_free(&ia->ia_ifa); 1271 return (error); 1272 } 1273 1274 void 1275 in6_purgeaddr(struct ifaddr *ifa) 1276 { 1277 struct ifnet *ifp = ifa->ifa_ifp; 1278 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1279 struct in6_multi_mship *imm; 1280 int plen, error; 1281 1282 if (ifa->ifa_carp) 1283 (*carp_detach_p)(ifa, false); 1284 1285 /* 1286 * Remove the loopback route to the interface address. 1287 * The check for the current setting of "nd6_useloopback" 1288 * is not needed. 1289 */ 1290 if (ia->ia_flags & IFA_RTSELF) { 1291 error = ifa_del_loopback_route((struct ifaddr *)ia, 1292 (struct sockaddr *)&ia->ia_addr); 1293 if (error == 0) 1294 ia->ia_flags &= ~IFA_RTSELF; 1295 } 1296 1297 /* stop DAD processing */ 1298 nd6_dad_stop(ifa); 1299 1300 /* Leave multicast groups. */ 1301 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1302 LIST_REMOVE(imm, i6mm_chain); 1303 if (imm->i6mm_maddr != NULL) 1304 in6_leavegroup(imm->i6mm_maddr, NULL); 1305 free(imm, M_IP6MADDR); 1306 } 1307 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1308 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) { 1309 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags | 1310 (ia->ia_dstaddr.sin6_family == AF_INET6 ? RTF_HOST : 0)); 1311 if (error != 0) 1312 log(LOG_INFO, "%s: err=%d, destination address delete " 1313 "failed\n", __func__, error); 1314 ia->ia_flags &= ~IFA_ROUTE; 1315 } 1316 1317 in6_newaddrmsg(ia, RTM_DELETE); 1318 in6_unlink_ifa(ia, ifp); 1319 } 1320 1321 static void 1322 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1323 { 1324 char ip6buf[INET6_ADDRSTRLEN]; 1325 int remove_lle; 1326 1327 IF_ADDR_WLOCK(ifp); 1328 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link); 1329 IF_ADDR_WUNLOCK(ifp); 1330 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1331 1332 /* 1333 * Defer the release of what might be the last reference to the 1334 * in6_ifaddr so that it can't be freed before the remainder of the 1335 * cleanup. 1336 */ 1337 IN6_IFADDR_WLOCK(); 1338 CK_STAILQ_REMOVE(&V_in6_ifaddrhead, ia, in6_ifaddr, ia_link); 1339 CK_LIST_REMOVE(ia, ia6_hash); 1340 IN6_IFADDR_WUNLOCK(); 1341 1342 /* 1343 * Release the reference to the base prefix. There should be a 1344 * positive reference. 1345 */ 1346 remove_lle = 0; 1347 if (ia->ia6_ndpr == NULL) { 1348 nd6log((LOG_NOTICE, 1349 "in6_unlink_ifa: autoconf'ed address " 1350 "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia)))); 1351 } else { 1352 ia->ia6_ndpr->ndpr_addrcnt--; 1353 /* Do not delete lles within prefix if refcont != 0 */ 1354 if (ia->ia6_ndpr->ndpr_addrcnt == 0) 1355 remove_lle = 1; 1356 ia->ia6_ndpr = NULL; 1357 } 1358 1359 nd6_rem_ifa_lle(ia, remove_lle); 1360 1361 /* 1362 * Also, if the address being removed is autoconf'ed, call 1363 * pfxlist_onlink_check() since the release might affect the status of 1364 * other (detached) addresses. 1365 */ 1366 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1367 pfxlist_onlink_check(); 1368 } 1369 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1370 } 1371 1372 /* 1373 * Notifies other subsystems about address change/arrival: 1374 * 1) Notifies device handler on the first IPv6 address assignment 1375 * 2) Handle routing table changes for P2P links and route 1376 * 3) Handle routing table changes for address host route 1377 */ 1378 static int 1379 in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia, 1380 struct in6_aliasreq *ifra, int hostIsNew) 1381 { 1382 int error = 0, plen, ifacount = 0; 1383 struct ifaddr *ifa; 1384 struct sockaddr_in6 *pdst; 1385 char ip6buf[INET6_ADDRSTRLEN]; 1386 1387 /* 1388 * Give the interface a chance to initialize 1389 * if this is its first address, 1390 */ 1391 if (hostIsNew != 0) { 1392 struct epoch_tracker et; 1393 1394 NET_EPOCH_ENTER(et); 1395 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1396 if (ifa->ifa_addr->sa_family != AF_INET6) 1397 continue; 1398 ifacount++; 1399 } 1400 NET_EPOCH_EXIT(et); 1401 } 1402 1403 if (ifacount <= 1 && ifp->if_ioctl) { 1404 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1405 if (error) 1406 goto done; 1407 } 1408 1409 /* 1410 * If a new destination address is specified, scrub the old one and 1411 * install the new destination. Note that the interface must be 1412 * p2p or loopback. 1413 */ 1414 pdst = &ifra->ifra_dstaddr; 1415 if (pdst->sin6_family == AF_INET6 && 1416 !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1417 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1418 (rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0)) { 1419 nd6log((LOG_ERR, "in6_update_ifa_internal: failed to " 1420 "remove a route to the old destination: %s\n", 1421 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1422 /* proceed anyway... */ 1423 } else 1424 ia->ia_flags &= ~IFA_ROUTE; 1425 ia->ia_dstaddr = *pdst; 1426 } 1427 1428 /* 1429 * If a new destination address is specified for a point-to-point 1430 * interface, install a route to the destination as an interface 1431 * direct route. 1432 * XXX: the logic below rejects assigning multiple addresses on a p2p 1433 * interface that share the same destination. 1434 */ 1435 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1436 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 && 1437 ia->ia_dstaddr.sin6_family == AF_INET6) { 1438 int rtflags = RTF_UP | RTF_HOST; 1439 /* 1440 * Handle the case for ::1 . 1441 */ 1442 if (ifp->if_flags & IFF_LOOPBACK) 1443 ia->ia_flags |= IFA_RTSELF; 1444 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags); 1445 if (error) 1446 goto done; 1447 ia->ia_flags |= IFA_ROUTE; 1448 } 1449 1450 /* 1451 * add a loopback route to self if not exists 1452 */ 1453 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) { 1454 error = ifa_add_loopback_route((struct ifaddr *)ia, 1455 (struct sockaddr *)&ia->ia_addr); 1456 if (error == 0) 1457 ia->ia_flags |= IFA_RTSELF; 1458 } 1459 done: 1460 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 1461 "Invoking IPv6 network device address event may sleep"); 1462 1463 ifa_ref(&ia->ia_ifa); 1464 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa, 1465 IFADDR_EVENT_ADD); 1466 ifa_free(&ia->ia_ifa); 1467 1468 return (error); 1469 } 1470 1471 /* 1472 * Find an IPv6 interface link-local address specific to an interface. 1473 * ifaddr is returned referenced. 1474 */ 1475 struct in6_ifaddr * 1476 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1477 { 1478 struct ifaddr *ifa; 1479 1480 NET_EPOCH_ASSERT(); 1481 1482 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1483 if (ifa->ifa_addr->sa_family != AF_INET6) 1484 continue; 1485 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1486 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1487 ignoreflags) != 0) 1488 continue; 1489 ifa_ref(ifa); 1490 break; 1491 } 1492 } 1493 1494 return ((struct in6_ifaddr *)ifa); 1495 } 1496 1497 1498 /* 1499 * find the interface address corresponding to a given IPv6 address. 1500 * ifaddr is returned referenced. 1501 */ 1502 struct in6_ifaddr * 1503 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid) 1504 { 1505 struct rm_priotracker in6_ifa_tracker; 1506 struct in6_ifaddr *ia; 1507 1508 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1509 CK_LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) { 1510 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1511 if (zoneid != 0 && 1512 zoneid != ia->ia_addr.sin6_scope_id) 1513 continue; 1514 ifa_ref(&ia->ia_ifa); 1515 break; 1516 } 1517 } 1518 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1519 return (ia); 1520 } 1521 1522 /* 1523 * find the internet address corresponding to a given interface and address. 1524 * ifaddr is returned referenced. 1525 */ 1526 struct in6_ifaddr * 1527 in6ifa_ifpwithaddr(struct ifnet *ifp, const struct in6_addr *addr) 1528 { 1529 struct epoch_tracker et; 1530 struct ifaddr *ifa; 1531 1532 NET_EPOCH_ENTER(et); 1533 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1534 if (ifa->ifa_addr->sa_family != AF_INET6) 1535 continue; 1536 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1537 ifa_ref(ifa); 1538 break; 1539 } 1540 } 1541 NET_EPOCH_EXIT(et); 1542 1543 return ((struct in6_ifaddr *)ifa); 1544 } 1545 1546 /* 1547 * Find a link-local scoped address on ifp and return it if any. 1548 */ 1549 struct in6_ifaddr * 1550 in6ifa_llaonifp(struct ifnet *ifp) 1551 { 1552 struct epoch_tracker et; 1553 struct sockaddr_in6 *sin6; 1554 struct ifaddr *ifa; 1555 1556 1557 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1558 return (NULL); 1559 NET_EPOCH_ENTER(et); 1560 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1561 if (ifa->ifa_addr->sa_family != AF_INET6) 1562 continue; 1563 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 1564 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 1565 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) || 1566 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr)) 1567 break; 1568 } 1569 NET_EPOCH_EXIT(et); 1570 1571 return ((struct in6_ifaddr *)ifa); 1572 } 1573 1574 /* 1575 * Convert IP6 address to printable (loggable) representation. Caller 1576 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 1577 */ 1578 static char digits[] = "0123456789abcdef"; 1579 char * 1580 ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 1581 { 1582 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0; 1583 char *cp; 1584 const u_int16_t *a = (const u_int16_t *)addr; 1585 const u_int8_t *d; 1586 int dcolon = 0, zero = 0; 1587 1588 cp = ip6buf; 1589 1590 for (i = 0; i < 8; i++) { 1591 if (*(a + i) == 0) { 1592 cnt++; 1593 if (cnt == 1) 1594 idx = i; 1595 } 1596 else if (maxcnt < cnt) { 1597 maxcnt = cnt; 1598 index = idx; 1599 cnt = 0; 1600 } 1601 } 1602 if (maxcnt < cnt) { 1603 maxcnt = cnt; 1604 index = idx; 1605 } 1606 1607 for (i = 0; i < 8; i++) { 1608 if (dcolon == 1) { 1609 if (*a == 0) { 1610 if (i == 7) 1611 *cp++ = ':'; 1612 a++; 1613 continue; 1614 } else 1615 dcolon = 2; 1616 } 1617 if (*a == 0) { 1618 if (dcolon == 0 && *(a + 1) == 0 && i == index) { 1619 if (i == 0) 1620 *cp++ = ':'; 1621 *cp++ = ':'; 1622 dcolon = 1; 1623 } else { 1624 *cp++ = '0'; 1625 *cp++ = ':'; 1626 } 1627 a++; 1628 continue; 1629 } 1630 d = (const u_char *)a; 1631 /* Try to eliminate leading zeros in printout like in :0001. */ 1632 zero = 1; 1633 *cp = digits[*d >> 4]; 1634 if (*cp != '0') { 1635 zero = 0; 1636 cp++; 1637 } 1638 *cp = digits[*d++ & 0xf]; 1639 if (zero == 0 || (*cp != '0')) { 1640 zero = 0; 1641 cp++; 1642 } 1643 *cp = digits[*d >> 4]; 1644 if (zero == 0 || (*cp != '0')) { 1645 zero = 0; 1646 cp++; 1647 } 1648 *cp++ = digits[*d & 0xf]; 1649 *cp++ = ':'; 1650 a++; 1651 } 1652 *--cp = '\0'; 1653 return (ip6buf); 1654 } 1655 1656 int 1657 in6_localaddr(struct in6_addr *in6) 1658 { 1659 struct rm_priotracker in6_ifa_tracker; 1660 struct in6_ifaddr *ia; 1661 1662 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1663 return 1; 1664 1665 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1666 CK_STAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 1667 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1668 &ia->ia_prefixmask.sin6_addr)) { 1669 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1670 return 1; 1671 } 1672 } 1673 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1674 1675 return (0); 1676 } 1677 1678 /* 1679 * Return 1 if an internet address is for the local host and configured 1680 * on one of its interfaces. 1681 */ 1682 int 1683 in6_localip(struct in6_addr *in6) 1684 { 1685 struct rm_priotracker in6_ifa_tracker; 1686 struct in6_ifaddr *ia; 1687 1688 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1689 CK_LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 1690 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) { 1691 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1692 return (1); 1693 } 1694 } 1695 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1696 return (0); 1697 } 1698 1699 /* 1700 * Return 1 if an internet address is configured on an interface. 1701 */ 1702 int 1703 in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr) 1704 { 1705 struct in6_addr in6; 1706 struct ifaddr *ifa; 1707 struct in6_ifaddr *ia6; 1708 1709 NET_EPOCH_ASSERT(); 1710 1711 in6 = *addr; 1712 if (in6_clearscope(&in6)) 1713 return (0); 1714 in6_setscope(&in6, ifp, NULL); 1715 1716 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1717 if (ifa->ifa_addr->sa_family != AF_INET6) 1718 continue; 1719 ia6 = (struct in6_ifaddr *)ifa; 1720 if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) 1721 return (1); 1722 } 1723 1724 return (0); 1725 } 1726 1727 int 1728 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1729 { 1730 struct rm_priotracker in6_ifa_tracker; 1731 struct in6_ifaddr *ia; 1732 1733 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1734 CK_LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) { 1735 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) { 1736 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 1737 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1738 return (1); /* true */ 1739 } 1740 break; 1741 } 1742 } 1743 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1744 1745 return (0); /* false */ 1746 } 1747 1748 /* 1749 * return length of part which dst and src are equal 1750 * hard coding... 1751 */ 1752 int 1753 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1754 { 1755 int match = 0; 1756 u_char *s = (u_char *)src, *d = (u_char *)dst; 1757 u_char *lim = s + 16, r; 1758 1759 while (s < lim) 1760 if ((r = (*d++ ^ *s++)) != 0) { 1761 while (r < 128) { 1762 match++; 1763 r <<= 1; 1764 } 1765 break; 1766 } else 1767 match += 8; 1768 return match; 1769 } 1770 1771 /* XXX: to be scope conscious */ 1772 int 1773 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1774 { 1775 int bytelen, bitlen; 1776 1777 /* sanity check */ 1778 if (0 > len || len > 128) { 1779 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1780 len); 1781 return (0); 1782 } 1783 1784 bytelen = len / 8; 1785 bitlen = len % 8; 1786 1787 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1788 return (0); 1789 if (bitlen != 0 && 1790 p1->s6_addr[bytelen] >> (8 - bitlen) != 1791 p2->s6_addr[bytelen] >> (8 - bitlen)) 1792 return (0); 1793 1794 return (1); 1795 } 1796 1797 void 1798 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1799 { 1800 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1801 int bytelen, bitlen, i; 1802 1803 /* sanity check */ 1804 if (0 > len || len > 128) { 1805 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1806 len); 1807 return; 1808 } 1809 1810 bzero(maskp, sizeof(*maskp)); 1811 bytelen = len / 8; 1812 bitlen = len % 8; 1813 for (i = 0; i < bytelen; i++) 1814 maskp->s6_addr[i] = 0xff; 1815 if (bitlen) 1816 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1817 } 1818 1819 /* 1820 * return the best address out of the same scope. if no address was 1821 * found, return the first valid address from designated IF. 1822 */ 1823 struct in6_ifaddr * 1824 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 1825 { 1826 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 1827 struct ifaddr *ifa; 1828 struct in6_ifaddr *besta = NULL; 1829 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 1830 1831 NET_EPOCH_ASSERT(); 1832 1833 dep[0] = dep[1] = NULL; 1834 1835 /* 1836 * We first look for addresses in the same scope. 1837 * If there is one, return it. 1838 * If two or more, return one which matches the dst longest. 1839 * If none, return one of global addresses assigned other ifs. 1840 */ 1841 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1842 if (ifa->ifa_addr->sa_family != AF_INET6) 1843 continue; 1844 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1845 continue; /* XXX: is there any case to allow anycast? */ 1846 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1847 continue; /* don't use this interface */ 1848 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1849 continue; 1850 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1851 if (V_ip6_use_deprecated) 1852 dep[0] = (struct in6_ifaddr *)ifa; 1853 continue; 1854 } 1855 1856 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 1857 /* 1858 * call in6_matchlen() as few as possible 1859 */ 1860 if (besta) { 1861 if (blen == -1) 1862 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 1863 tlen = in6_matchlen(IFA_IN6(ifa), dst); 1864 if (tlen > blen) { 1865 blen = tlen; 1866 besta = (struct in6_ifaddr *)ifa; 1867 } 1868 } else 1869 besta = (struct in6_ifaddr *)ifa; 1870 } 1871 } 1872 if (besta) { 1873 ifa_ref(&besta->ia_ifa); 1874 return (besta); 1875 } 1876 1877 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1878 if (ifa->ifa_addr->sa_family != AF_INET6) 1879 continue; 1880 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1881 continue; /* XXX: is there any case to allow anycast? */ 1882 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1883 continue; /* don't use this interface */ 1884 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1885 continue; 1886 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1887 if (V_ip6_use_deprecated) 1888 dep[1] = (struct in6_ifaddr *)ifa; 1889 continue; 1890 } 1891 1892 if (ifa != NULL) 1893 ifa_ref(ifa); 1894 return (struct in6_ifaddr *)ifa; 1895 } 1896 1897 /* use the last-resort values, that are, deprecated addresses */ 1898 if (dep[0]) { 1899 ifa_ref((struct ifaddr *)dep[0]); 1900 return dep[0]; 1901 } 1902 if (dep[1]) { 1903 ifa_ref((struct ifaddr *)dep[1]); 1904 return dep[1]; 1905 } 1906 1907 return NULL; 1908 } 1909 1910 /* 1911 * perform DAD when interface becomes IFF_UP. 1912 */ 1913 void 1914 in6_if_up(struct ifnet *ifp) 1915 { 1916 struct epoch_tracker et; 1917 struct ifaddr *ifa; 1918 struct in6_ifaddr *ia; 1919 1920 NET_EPOCH_ENTER(et); 1921 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1922 if (ifa->ifa_addr->sa_family != AF_INET6) 1923 continue; 1924 ia = (struct in6_ifaddr *)ifa; 1925 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 1926 /* 1927 * The TENTATIVE flag was likely set by hand 1928 * beforehand, implicitly indicating the need for DAD. 1929 * We may be able to skip the random delay in this 1930 * case, but we impose delays just in case. 1931 */ 1932 nd6_dad_start(ifa, 1933 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 1934 } 1935 } 1936 NET_EPOCH_EXIT(et); 1937 1938 /* 1939 * special cases, like 6to4, are handled in in6_ifattach 1940 */ 1941 in6_ifattach(ifp, NULL); 1942 } 1943 1944 int 1945 in6if_do_dad(struct ifnet *ifp) 1946 { 1947 1948 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 1949 return (0); 1950 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1951 return (0); 1952 if ((ND_IFINFO(ifp)->flags & 1953 (ND6_IFF_IFDISABLED | ND6_IFF_NO_DAD)) != 0) 1954 return (0); 1955 return (1); 1956 } 1957 1958 /* 1959 * Calculate max IPv6 MTU through all the interfaces and store it 1960 * to in6_maxmtu. 1961 */ 1962 void 1963 in6_setmaxmtu(void) 1964 { 1965 struct epoch_tracker et; 1966 unsigned long maxmtu = 0; 1967 struct ifnet *ifp; 1968 1969 NET_EPOCH_ENTER(et); 1970 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1971 /* this function can be called during ifnet initialization */ 1972 if (!ifp->if_afdata[AF_INET6]) 1973 continue; 1974 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 1975 IN6_LINKMTU(ifp) > maxmtu) 1976 maxmtu = IN6_LINKMTU(ifp); 1977 } 1978 NET_EPOCH_EXIT(et); 1979 if (maxmtu) /* update only when maxmtu is positive */ 1980 V_in6_maxmtu = maxmtu; 1981 } 1982 1983 /* 1984 * Provide the length of interface identifiers to be used for the link attached 1985 * to the given interface. The length should be defined in "IPv6 over 1986 * xxx-link" document. Note that address architecture might also define 1987 * the length for a particular set of address prefixes, regardless of the 1988 * link type. As clarified in rfc2462bis, those two definitions should be 1989 * consistent, and those really are as of August 2004. 1990 */ 1991 int 1992 in6_if2idlen(struct ifnet *ifp) 1993 { 1994 switch (ifp->if_type) { 1995 case IFT_ETHER: /* RFC2464 */ 1996 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 1997 case IFT_L2VLAN: /* ditto */ 1998 case IFT_BRIDGE: /* bridge(4) only does Ethernet-like links */ 1999 case IFT_INFINIBAND: 2000 return (64); 2001 case IFT_PPP: /* RFC2472 */ 2002 return (64); 2003 case IFT_FRELAY: /* RFC2590 */ 2004 return (64); 2005 case IFT_IEEE1394: /* RFC3146 */ 2006 return (64); 2007 case IFT_GIF: 2008 return (64); /* draft-ietf-v6ops-mech-v2-07 */ 2009 case IFT_LOOP: 2010 return (64); /* XXX: is this really correct? */ 2011 default: 2012 /* 2013 * Unknown link type: 2014 * It might be controversial to use the today's common constant 2015 * of 64 for these cases unconditionally. For full compliance, 2016 * we should return an error in this case. On the other hand, 2017 * if we simply miss the standard for the link type or a new 2018 * standard is defined for a new link type, the IFID length 2019 * is very likely to be the common constant. As a compromise, 2020 * we always use the constant, but make an explicit notice 2021 * indicating the "unknown" case. 2022 */ 2023 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2024 return (64); 2025 } 2026 } 2027 2028 struct in6_llentry { 2029 struct llentry base; 2030 }; 2031 2032 #define IN6_LLTBL_DEFAULT_HSIZE 32 2033 #define IN6_LLTBL_HASH(k, h) \ 2034 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 2035 2036 /* 2037 * Do actual deallocation of @lle. 2038 */ 2039 static void 2040 in6_lltable_destroy_lle_unlocked(epoch_context_t ctx) 2041 { 2042 struct llentry *lle; 2043 2044 lle = __containerof(ctx, struct llentry, lle_epoch_ctx); 2045 LLE_LOCK_DESTROY(lle); 2046 LLE_REQ_DESTROY(lle); 2047 free(lle, M_LLTABLE); 2048 } 2049 2050 /* 2051 * Called by LLE_FREE_LOCKED when number of references 2052 * drops to zero. 2053 */ 2054 static void 2055 in6_lltable_destroy_lle(struct llentry *lle) 2056 { 2057 2058 LLE_WUNLOCK(lle); 2059 epoch_call(net_epoch_preempt, &lle->lle_epoch_ctx, in6_lltable_destroy_lle_unlocked); 2060 } 2061 2062 static struct llentry * 2063 in6_lltable_new(const struct in6_addr *addr6, u_int flags) 2064 { 2065 struct in6_llentry *lle; 2066 2067 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 2068 if (lle == NULL) /* NB: caller generates msg */ 2069 return NULL; 2070 2071 lle->base.r_l3addr.addr6 = *addr6; 2072 lle->base.lle_refcnt = 1; 2073 lle->base.lle_free = in6_lltable_destroy_lle; 2074 LLE_LOCK_INIT(&lle->base); 2075 LLE_REQ_INIT(&lle->base); 2076 callout_init(&lle->base.lle_timer, 1); 2077 2078 return (&lle->base); 2079 } 2080 2081 static int 2082 in6_lltable_match_prefix(const struct sockaddr *saddr, 2083 const struct sockaddr *smask, u_int flags, struct llentry *lle) 2084 { 2085 const struct in6_addr *addr, *mask, *lle_addr; 2086 2087 addr = &((const struct sockaddr_in6 *)saddr)->sin6_addr; 2088 mask = &((const struct sockaddr_in6 *)smask)->sin6_addr; 2089 lle_addr = &lle->r_l3addr.addr6; 2090 2091 if (IN6_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0) 2092 return (0); 2093 2094 if (lle->la_flags & LLE_IFADDR) { 2095 2096 /* 2097 * Delete LLE_IFADDR records IFF address & flag matches. 2098 * Note that addr is the interface address within prefix 2099 * being matched. 2100 */ 2101 if (IN6_ARE_ADDR_EQUAL(addr, lle_addr) && 2102 (flags & LLE_STATIC) != 0) 2103 return (1); 2104 return (0); 2105 } 2106 2107 /* flags & LLE_STATIC means deleting both dynamic and static entries */ 2108 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC)) 2109 return (1); 2110 2111 return (0); 2112 } 2113 2114 static void 2115 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle) 2116 { 2117 struct ifnet *ifp; 2118 2119 LLE_WLOCK_ASSERT(lle); 2120 KASSERT(llt != NULL, ("lltable is NULL")); 2121 2122 /* Unlink entry from table */ 2123 if ((lle->la_flags & LLE_LINKED) != 0) { 2124 2125 ifp = llt->llt_ifp; 2126 IF_AFDATA_WLOCK_ASSERT(ifp); 2127 lltable_unlink_entry(llt, lle); 2128 } 2129 2130 llentry_free(lle); 2131 } 2132 2133 static int 2134 in6_lltable_rtcheck(struct ifnet *ifp, 2135 u_int flags, 2136 const struct sockaddr *l3addr) 2137 { 2138 const struct sockaddr_in6 *sin6; 2139 struct nhop6_basic nh6; 2140 struct in6_addr dst; 2141 uint32_t scopeid; 2142 int error; 2143 char ip6buf[INET6_ADDRSTRLEN]; 2144 int fibnum; 2145 2146 NET_EPOCH_ASSERT(); 2147 KASSERT(l3addr->sa_family == AF_INET6, 2148 ("sin_family %d", l3addr->sa_family)); 2149 2150 sin6 = (const struct sockaddr_in6 *)l3addr; 2151 in6_splitscope(&sin6->sin6_addr, &dst, &scopeid); 2152 fibnum = V_rt_add_addr_allfibs ? RT_DEFAULT_FIB : ifp->if_fib; 2153 error = fib6_lookup_nh_basic(fibnum, &dst, scopeid, 0, 0, &nh6); 2154 if (error != 0 || (nh6.nh_flags & NHF_GATEWAY) || nh6.nh_ifp != ifp) { 2155 struct ifaddr *ifa; 2156 /* 2157 * Create an ND6 cache for an IPv6 neighbor 2158 * that is not covered by our own prefix. 2159 */ 2160 ifa = ifaof_ifpforaddr(l3addr, ifp); 2161 if (ifa != NULL) { 2162 return 0; 2163 } 2164 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2165 ip6_sprintf(ip6buf, &sin6->sin6_addr)); 2166 return EINVAL; 2167 } 2168 return 0; 2169 } 2170 2171 /* 2172 * Called by the datapath to indicate that the entry was used. 2173 */ 2174 static void 2175 in6_lltable_mark_used(struct llentry *lle) 2176 { 2177 2178 LLE_REQ_LOCK(lle); 2179 lle->r_skip_req = 0; 2180 2181 /* 2182 * Set the hit time so the callback function 2183 * can determine the remaining time before 2184 * transiting to the DELAY state. 2185 */ 2186 lle->lle_hittime = time_uptime; 2187 LLE_REQ_UNLOCK(lle); 2188 } 2189 2190 static inline uint32_t 2191 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize) 2192 { 2193 2194 return (IN6_LLTBL_HASH(dst->s6_addr32[3], hsize)); 2195 } 2196 2197 static uint32_t 2198 in6_lltable_hash(const struct llentry *lle, uint32_t hsize) 2199 { 2200 2201 return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize)); 2202 } 2203 2204 static void 2205 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 2206 { 2207 struct sockaddr_in6 *sin6; 2208 2209 sin6 = (struct sockaddr_in6 *)sa; 2210 bzero(sin6, sizeof(*sin6)); 2211 sin6->sin6_family = AF_INET6; 2212 sin6->sin6_len = sizeof(*sin6); 2213 sin6->sin6_addr = lle->r_l3addr.addr6; 2214 } 2215 2216 static inline struct llentry * 2217 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst) 2218 { 2219 struct llentry *lle; 2220 struct llentries *lleh; 2221 u_int hashidx; 2222 2223 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize); 2224 lleh = &llt->lle_head[hashidx]; 2225 CK_LIST_FOREACH(lle, lleh, lle_next) { 2226 if (lle->la_flags & LLE_DELETED) 2227 continue; 2228 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst)) 2229 break; 2230 } 2231 2232 return (lle); 2233 } 2234 2235 static void 2236 in6_lltable_delete_entry(struct lltable *llt, struct llentry *lle) 2237 { 2238 2239 lle->la_flags |= LLE_DELETED; 2240 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 2241 #ifdef DIAGNOSTIC 2242 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2243 #endif 2244 llentry_free(lle); 2245 } 2246 2247 static struct llentry * 2248 in6_lltable_alloc(struct lltable *llt, u_int flags, 2249 const struct sockaddr *l3addr) 2250 { 2251 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2252 struct ifnet *ifp = llt->llt_ifp; 2253 struct llentry *lle; 2254 char linkhdr[LLE_MAX_LINKHDR]; 2255 size_t linkhdrsize; 2256 int lladdr_off; 2257 2258 KASSERT(l3addr->sa_family == AF_INET6, 2259 ("sin_family %d", l3addr->sa_family)); 2260 2261 /* 2262 * A route that covers the given address must have 2263 * been installed 1st because we are doing a resolution, 2264 * verify this. 2265 */ 2266 if (!(flags & LLE_IFADDR) && 2267 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2268 return (NULL); 2269 2270 lle = in6_lltable_new(&sin6->sin6_addr, flags); 2271 if (lle == NULL) { 2272 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2273 return (NULL); 2274 } 2275 lle->la_flags = flags; 2276 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 2277 linkhdrsize = LLE_MAX_LINKHDR; 2278 if (lltable_calc_llheader(ifp, AF_INET6, IF_LLADDR(ifp), 2279 linkhdr, &linkhdrsize, &lladdr_off) != 0) { 2280 epoch_call(net_epoch_preempt, &lle->lle_epoch_ctx, in6_lltable_destroy_lle_unlocked); 2281 return (NULL); 2282 } 2283 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize, 2284 lladdr_off); 2285 lle->la_flags |= LLE_STATIC; 2286 } 2287 2288 if ((lle->la_flags & LLE_STATIC) != 0) 2289 lle->ln_state = ND6_LLINFO_REACHABLE; 2290 2291 return (lle); 2292 } 2293 2294 static struct llentry * 2295 in6_lltable_lookup(struct lltable *llt, u_int flags, 2296 const struct sockaddr *l3addr) 2297 { 2298 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2299 struct llentry *lle; 2300 2301 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 2302 KASSERT(l3addr->sa_family == AF_INET6, 2303 ("sin_family %d", l3addr->sa_family)); 2304 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) != 2305 (LLE_UNLOCKED | LLE_EXCLUSIVE), 2306 ("wrong lle request flags: %#x", flags)); 2307 2308 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2309 if (lle == NULL) 2310 return (NULL); 2311 if (flags & LLE_UNLOCKED) 2312 return (lle); 2313 2314 if (flags & LLE_EXCLUSIVE) 2315 LLE_WLOCK(lle); 2316 else 2317 LLE_RLOCK(lle); 2318 2319 /* 2320 * If the afdata lock is not held, the LLE may have been unlinked while 2321 * we were blocked on the LLE lock. Check for this case. 2322 */ 2323 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) { 2324 if (flags & LLE_EXCLUSIVE) 2325 LLE_WUNLOCK(lle); 2326 else 2327 LLE_RUNLOCK(lle); 2328 return (NULL); 2329 } 2330 return (lle); 2331 } 2332 2333 static int 2334 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 2335 struct sysctl_req *wr) 2336 { 2337 struct ifnet *ifp = llt->llt_ifp; 2338 /* XXX stack use */ 2339 struct { 2340 struct rt_msghdr rtm; 2341 struct sockaddr_in6 sin6; 2342 /* 2343 * ndp.c assumes that sdl is word aligned 2344 */ 2345 #ifdef __LP64__ 2346 uint32_t pad; 2347 #endif 2348 struct sockaddr_dl sdl; 2349 } ndpc; 2350 struct sockaddr_dl *sdl; 2351 int error; 2352 2353 bzero(&ndpc, sizeof(ndpc)); 2354 /* skip deleted entries */ 2355 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 2356 return (0); 2357 /* Skip if jailed and not a valid IP of the prison. */ 2358 lltable_fill_sa_entry(lle, (struct sockaddr *)&ndpc.sin6); 2359 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&ndpc.sin6) != 0) 2360 return (0); 2361 /* 2362 * produce a msg made of: 2363 * struct rt_msghdr; 2364 * struct sockaddr_in6 (IPv6) 2365 * struct sockaddr_dl; 2366 */ 2367 ndpc.rtm.rtm_msglen = sizeof(ndpc); 2368 ndpc.rtm.rtm_version = RTM_VERSION; 2369 ndpc.rtm.rtm_type = RTM_GET; 2370 ndpc.rtm.rtm_flags = RTF_UP; 2371 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 2372 if (V_deembed_scopeid) 2373 sa6_recoverscope(&ndpc.sin6); 2374 2375 /* publish */ 2376 if (lle->la_flags & LLE_PUB) 2377 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE; 2378 2379 sdl = &ndpc.sdl; 2380 sdl->sdl_family = AF_LINK; 2381 sdl->sdl_len = sizeof(*sdl); 2382 sdl->sdl_index = ifp->if_index; 2383 sdl->sdl_type = ifp->if_type; 2384 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 2385 sdl->sdl_alen = ifp->if_addrlen; 2386 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 2387 } else { 2388 sdl->sdl_alen = 0; 2389 bzero(LLADDR(sdl), ifp->if_addrlen); 2390 } 2391 if (lle->la_expire != 0) 2392 ndpc.rtm.rtm_rmx.rmx_expire = lle->la_expire + 2393 lle->lle_remtime / hz + time_second - time_uptime; 2394 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 2395 if (lle->la_flags & LLE_STATIC) 2396 ndpc.rtm.rtm_flags |= RTF_STATIC; 2397 if (lle->la_flags & LLE_IFADDR) 2398 ndpc.rtm.rtm_flags |= RTF_PINNED; 2399 if (lle->ln_router != 0) 2400 ndpc.rtm.rtm_flags |= RTF_GATEWAY; 2401 ndpc.rtm.rtm_rmx.rmx_pksent = lle->la_asked; 2402 /* Store state in rmx_weight value */ 2403 ndpc.rtm.rtm_rmx.rmx_state = lle->ln_state; 2404 ndpc.rtm.rtm_index = ifp->if_index; 2405 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc)); 2406 2407 return (error); 2408 } 2409 2410 static struct lltable * 2411 in6_lltattach(struct ifnet *ifp) 2412 { 2413 struct lltable *llt; 2414 2415 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE); 2416 llt->llt_af = AF_INET6; 2417 llt->llt_ifp = ifp; 2418 2419 llt->llt_lookup = in6_lltable_lookup; 2420 llt->llt_alloc_entry = in6_lltable_alloc; 2421 llt->llt_delete_entry = in6_lltable_delete_entry; 2422 llt->llt_dump_entry = in6_lltable_dump_entry; 2423 llt->llt_hash = in6_lltable_hash; 2424 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry; 2425 llt->llt_free_entry = in6_lltable_free_entry; 2426 llt->llt_match_prefix = in6_lltable_match_prefix; 2427 llt->llt_mark_used = in6_lltable_mark_used; 2428 lltable_link(llt); 2429 2430 return (llt); 2431 } 2432 2433 void * 2434 in6_domifattach(struct ifnet *ifp) 2435 { 2436 struct in6_ifextra *ext; 2437 2438 /* There are not IPv6-capable interfaces. */ 2439 switch (ifp->if_type) { 2440 case IFT_PFLOG: 2441 case IFT_PFSYNC: 2442 case IFT_USB: 2443 return (NULL); 2444 } 2445 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2446 bzero(ext, sizeof(*ext)); 2447 2448 ext->in6_ifstat = malloc(sizeof(counter_u64_t) * 2449 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK); 2450 COUNTER_ARRAY_ALLOC(ext->in6_ifstat, 2451 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK); 2452 2453 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) * 2454 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR, 2455 M_WAITOK); 2456 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat, 2457 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK); 2458 2459 ext->nd_ifinfo = nd6_ifattach(ifp); 2460 ext->scope6_id = scope6_ifattach(ifp); 2461 ext->lltable = in6_lltattach(ifp); 2462 2463 ext->mld_ifinfo = mld_domifattach(ifp); 2464 2465 return ext; 2466 } 2467 2468 int 2469 in6_domifmtu(struct ifnet *ifp) 2470 { 2471 if (ifp->if_afdata[AF_INET6] == NULL) 2472 return ifp->if_mtu; 2473 2474 return (IN6_LINKMTU(ifp)); 2475 } 2476 2477 void 2478 in6_domifdetach(struct ifnet *ifp, void *aux) 2479 { 2480 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2481 2482 mld_domifdetach(ifp); 2483 scope6_ifdetach(ext->scope6_id); 2484 nd6_ifdetach(ifp, ext->nd_ifinfo); 2485 lltable_free(ext->lltable); 2486 COUNTER_ARRAY_FREE(ext->in6_ifstat, 2487 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 2488 free(ext->in6_ifstat, M_IFADDR); 2489 COUNTER_ARRAY_FREE(ext->icmp6_ifstat, 2490 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 2491 free(ext->icmp6_ifstat, M_IFADDR); 2492 free(ext, M_IFADDR); 2493 } 2494 2495 /* 2496 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2497 * v4 mapped addr or v4 compat addr 2498 */ 2499 void 2500 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2501 { 2502 2503 bzero(sin, sizeof(*sin)); 2504 sin->sin_len = sizeof(struct sockaddr_in); 2505 sin->sin_family = AF_INET; 2506 sin->sin_port = sin6->sin6_port; 2507 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2508 } 2509 2510 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2511 void 2512 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2513 { 2514 bzero(sin6, sizeof(*sin6)); 2515 sin6->sin6_len = sizeof(struct sockaddr_in6); 2516 sin6->sin6_family = AF_INET6; 2517 sin6->sin6_port = sin->sin_port; 2518 sin6->sin6_addr.s6_addr32[0] = 0; 2519 sin6->sin6_addr.s6_addr32[1] = 0; 2520 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2521 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2522 } 2523 2524 /* Convert sockaddr_in6 into sockaddr_in. */ 2525 void 2526 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2527 { 2528 struct sockaddr_in *sin_p; 2529 struct sockaddr_in6 sin6; 2530 2531 /* 2532 * Save original sockaddr_in6 addr and convert it 2533 * to sockaddr_in. 2534 */ 2535 sin6 = *(struct sockaddr_in6 *)nam; 2536 sin_p = (struct sockaddr_in *)nam; 2537 in6_sin6_2_sin(sin_p, &sin6); 2538 } 2539 2540 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2541 void 2542 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2543 { 2544 struct sockaddr_in *sin_p; 2545 struct sockaddr_in6 *sin6_p; 2546 2547 sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK); 2548 sin_p = (struct sockaddr_in *)*nam; 2549 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2550 free(*nam, M_SONAME); 2551 *nam = (struct sockaddr *)sin6_p; 2552 } 2553