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 63 #include <sys/cdefs.h> 64 #include "opt_inet.h" 65 #include "opt_inet6.h" 66 67 #include <sys/param.h> 68 #include <sys/eventhandler.h> 69 #include <sys/errno.h> 70 #include <sys/jail.h> 71 #include <sys/malloc.h> 72 #include <sys/socket.h> 73 #include <sys/socketvar.h> 74 #include <sys/sockio.h> 75 #include <sys/systm.h> 76 #include <sys/priv.h> 77 #include <sys/proc.h> 78 #include <sys/time.h> 79 #include <sys/kernel.h> 80 #include <sys/lock.h> 81 #include <sys/rmlock.h> 82 #include <sys/sysctl.h> 83 #include <sys/syslog.h> 84 85 #include <net/if.h> 86 #include <net/if_var.h> 87 #include <net/if_private.h> 88 #include <net/if_types.h> 89 #include <net/if_bridgevar.h> 90 #include <net/route.h> 91 #include <net/route/route_ctl.h> 92 #include <net/route/nhop.h> 93 #include <net/if_dl.h> 94 #include <net/vnet.h> 95 96 #include <netinet/in.h> 97 #include <netinet/in_var.h> 98 #include <net/if_llatbl.h> 99 #include <netinet/if_ether.h> 100 #include <netinet/in_systm.h> 101 #include <netinet/ip.h> 102 #include <netinet/in_pcb.h> 103 #include <netinet/ip_carp.h> 104 #include <netinet/icmp6.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 #ifdef MAC 117 #include <security/mac/mac_framework.h> 118 #endif 119 120 /* 121 * struct in6_ifreq and struct ifreq must be type punnable for common members 122 * of ifr_ifru to allow accessors to be shared. 123 */ 124 _Static_assert(offsetof(struct in6_ifreq, ifr_ifru) == 125 offsetof(struct ifreq, ifr_ifru), 126 "struct in6_ifreq and struct ifreq are not type punnable"); 127 128 VNET_DEFINE_STATIC(int, icmp6_nodeinfo_oldmcprefix) = 1; 129 #define V_icmp6_nodeinfo_oldmcprefix VNET(icmp6_nodeinfo_oldmcprefix) 130 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO_OLDMCPREFIX, 131 nodeinfo_oldmcprefix, CTLFLAG_VNET | CTLFLAG_RW, 132 &VNET_NAME(icmp6_nodeinfo_oldmcprefix), 0, 133 "Join old IPv6 NI group address in draft-ietf-ipngwg-icmp-name-lookup " 134 "for compatibility with KAME implementation"); 135 136 VNET_DEFINE_STATIC(int, nd6_useloopback) = 1; 137 #define V_nd6_useloopback VNET(nd6_useloopback) 138 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_USELOOPBACK, nd6_useloopback, 139 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_useloopback), 0, 140 "Create a loopback route when configuring an IPv6 address"); 141 142 /* 143 * Definitions of some costant IP6 addresses. 144 */ 145 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 146 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 147 const struct in6_addr in6addr_nodelocal_allnodes = 148 IN6ADDR_NODELOCAL_ALLNODES_INIT; 149 const struct in6_addr in6addr_linklocal_allnodes = 150 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 151 const struct in6_addr in6addr_linklocal_allrouters = 152 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 153 const struct in6_addr in6addr_linklocal_allv2routers = 154 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT; 155 156 const struct in6_addr in6mask0 = IN6MASK0; 157 const struct in6_addr in6mask32 = IN6MASK32; 158 const struct in6_addr in6mask64 = IN6MASK64; 159 const struct in6_addr in6mask96 = IN6MASK96; 160 const struct in6_addr in6mask128 = IN6MASK128; 161 162 const struct sockaddr_in6 sa6_any = 163 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 }; 164 165 static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *, 166 struct in6_aliasreq *, int); 167 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 168 169 static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *, 170 struct in6_ifaddr *, int); 171 static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *, 172 struct in6_aliasreq *, int flags); 173 static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *, 174 struct in6_ifaddr *, int, int); 175 static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *, 176 struct in6_ifaddr *, int); 177 178 static void in6_join_proxy_ndp_mc(struct ifnet *, const struct in6_addr *); 179 static void in6_leave_proxy_ndp_mc(struct ifnet *, const struct in6_addr *); 180 181 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 182 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 183 184 static struct sx in6_control_sx; 185 SX_SYSINIT(in6_control_sx, &in6_control_sx, "in6_control"); 186 187 void 188 in6_newaddrmsg(struct in6_ifaddr *ia, int cmd) 189 { 190 struct rt_addrinfo info; 191 struct ifaddr *ifa; 192 struct sockaddr_dl gateway; 193 int fibnum; 194 195 ifa = &ia->ia_ifa; 196 197 /* 198 * Prepare info data for the host route. 199 * This code mimics one from ifa_maintain_loopback_route(). 200 */ 201 bzero(&info, sizeof(struct rt_addrinfo)); 202 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED; 203 info.rti_info[RTAX_DST] = ifa->ifa_addr; 204 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&gateway; 205 link_init_sdl(ifa->ifa_ifp, (struct sockaddr *)&gateway, ifa->ifa_ifp->if_type); 206 if (cmd != RTM_DELETE) 207 info.rti_ifp = V_loif; 208 209 fibnum = ia62ifa(ia)->ifa_ifp->if_fib; 210 211 if (cmd == RTM_ADD) { 212 rt_addrmsg(cmd, &ia->ia_ifa, fibnum); 213 rt_routemsg_info(cmd, &info, fibnum); 214 } else if (cmd == RTM_DELETE) { 215 rt_routemsg_info(cmd, &info, fibnum); 216 rt_addrmsg(cmd, &ia->ia_ifa, fibnum); 217 } 218 } 219 220 int 221 in6_mask2len(struct in6_addr *mask, u_char *lim0) 222 { 223 int x = 0, y; 224 u_char *lim = lim0, *p; 225 226 /* ignore the scope_id part */ 227 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 228 lim = (u_char *)mask + sizeof(*mask); 229 for (p = (u_char *)mask; p < lim; x++, p++) { 230 if (*p != 0xff) 231 break; 232 } 233 y = 0; 234 if (p < lim) { 235 for (y = 0; y < 8; y++) { 236 if ((*p & (0x80 >> y)) == 0) 237 break; 238 } 239 } 240 241 /* 242 * when the limit pointer is given, do a stricter check on the 243 * remaining bits. 244 */ 245 if (p < lim) { 246 if (y != 0 && (*p & (0x00ff >> y)) != 0) 247 return (-1); 248 for (p = p + 1; p < lim; p++) 249 if (*p != 0) 250 return (-1); 251 } 252 253 return x * 8 + y; 254 } 255 256 #ifdef COMPAT_FREEBSD32 257 struct in6_ndifreq32 { 258 char ifname[IFNAMSIZ]; 259 uint32_t ifindex; 260 }; 261 #define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32) 262 #endif 263 264 int 265 in6_control_ioctl(u_long cmd, void *data, 266 struct ifnet *ifp, struct ucred *cred) 267 { 268 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 269 struct in6_ifaddr *ia = NULL; 270 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 271 struct sockaddr_in6 *sa6; 272 int error; 273 bool control_locked = false; 274 275 /* 276 * Compat to make pre-10.x ifconfig(8) operable. 277 */ 278 if (cmd == OSIOCAIFADDR_IN6) { 279 cmd = SIOCAIFADDR_IN6; 280 ifra->ifra_vhid = 0; 281 } 282 283 switch (cmd) { 284 case SIOCGETSGCNT_IN6: 285 case SIOCGETMIFCNT_IN6: 286 /* 287 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c. 288 * We cannot see how that would be needed, so do not adjust the 289 * KPI blindly; more likely should clean up the IPv4 variant. 290 */ 291 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP); 292 } 293 294 switch (cmd) { 295 case SIOCAADDRCTL_POLICY: 296 case SIOCDADDRCTL_POLICY: 297 if (cred != NULL) { 298 error = priv_check_cred(cred, PRIV_NETINET_ADDRCTRL6); 299 if (error) 300 return (error); 301 } 302 return (in6_src_ioctl(cmd, data)); 303 } 304 305 if (ifp == NULL) 306 return (EOPNOTSUPP); 307 308 switch (cmd) { 309 case SIOCSNDFLUSH_IN6: 310 case SIOCSPFXFLUSH_IN6: 311 case SIOCSRTRFLUSH_IN6: 312 case SIOCSDEFIFACE_IN6: 313 case SIOCSIFINFO_FLAGS: 314 case SIOCSIFINFO_IN6: 315 if (cred != NULL) { 316 error = priv_check_cred(cred, PRIV_NETINET_ND6); 317 if (error) 318 return (error); 319 } 320 /* FALLTHROUGH */ 321 case OSIOCGIFINFO_IN6: 322 case SIOCGIFINFO_IN6: 323 case SIOCGNBRINFO_IN6: 324 case SIOCGDEFIFACE_IN6: 325 return (nd6_ioctl(cmd, data, ifp)); 326 327 #ifdef COMPAT_FREEBSD32 328 case SIOCGDEFIFACE32_IN6: 329 { 330 struct in6_ndifreq ndif; 331 struct in6_ndifreq32 *ndif32; 332 333 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif, 334 ifp); 335 if (error) 336 return (error); 337 ndif32 = (struct in6_ndifreq32 *)data; 338 ndif32->ifindex = ndif.ifindex; 339 return (0); 340 } 341 #endif 342 } 343 344 switch (cmd) { 345 case SIOCSIFPREFIX_IN6: 346 case SIOCDIFPREFIX_IN6: 347 case SIOCAIFPREFIX_IN6: 348 case SIOCCIFPREFIX_IN6: 349 case SIOCSGIFPREFIX_IN6: 350 case SIOCGIFPREFIX_IN6: 351 log(LOG_NOTICE, 352 "prefix ioctls are now invalidated. " 353 "please use ifconfig.\n"); 354 return (EOPNOTSUPP); 355 } 356 357 switch (cmd) { 358 case SIOCSSCOPE6: 359 if (cred != NULL) { 360 error = priv_check_cred(cred, PRIV_NETINET_SCOPE6); 361 if (error) 362 return (error); 363 } 364 /* FALLTHROUGH */ 365 case SIOCGSCOPE6: 366 case SIOCGSCOPE6DEF: 367 return (scope6_ioctl(cmd, data, ifp)); 368 } 369 370 /* 371 * Find address for this interface, if it exists. 372 * 373 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 374 * only, and used the first interface address as the target of other 375 * operations (without checking ifra_addr). This was because netinet 376 * code/API assumed at most 1 interface address per interface. 377 * Since IPv6 allows a node to assign multiple addresses 378 * on a single interface, we almost always look and check the 379 * presence of ifra_addr, and reject invalid ones here. 380 * It also decreases duplicated code among SIOC*_IN6 operations. 381 */ 382 switch (cmd) { 383 case SIOCAIFADDR_IN6: 384 case SIOCSIFPHYADDR_IN6: 385 sa6 = &ifra->ifra_addr; 386 break; 387 case SIOCSIFADDR_IN6: 388 case SIOCGIFADDR_IN6: 389 case SIOCSIFDSTADDR_IN6: 390 case SIOCSIFNETMASK_IN6: 391 case SIOCGIFDSTADDR_IN6: 392 case SIOCGIFNETMASK_IN6: 393 case SIOCDIFADDR_IN6: 394 case SIOCGIFPSRCADDR_IN6: 395 case SIOCGIFPDSTADDR_IN6: 396 case SIOCGIFAFLAG_IN6: 397 case SIOCSNDFLUSH_IN6: 398 case SIOCSPFXFLUSH_IN6: 399 case SIOCSRTRFLUSH_IN6: 400 case SIOCGIFALIFETIME_IN6: 401 case SIOCGIFSTAT_IN6: 402 case SIOCGIFSTAT_ICMP6: 403 sa6 = &ifr->ifr_addr; 404 break; 405 case SIOCSIFADDR: 406 case SIOCSIFBRDADDR: 407 case SIOCSIFDSTADDR: 408 case SIOCSIFNETMASK: 409 /* 410 * Although we should pass any non-INET6 ioctl requests 411 * down to driver, we filter some legacy INET requests. 412 * Drivers trust SIOCSIFADDR et al to come from an already 413 * privileged layer, and do not perform any credentials 414 * checks or input validation. 415 */ 416 return (EINVAL); 417 default: 418 sa6 = NULL; 419 break; 420 } 421 if (sa6 && sa6->sin6_family == AF_INET6) { 422 if (sa6->sin6_scope_id != 0) 423 error = sa6_embedscope(sa6, 0); 424 else 425 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 426 if (error != 0) 427 return (error); 428 if (cred != NULL && (error = prison_check_ip6(cred, 429 &sa6->sin6_addr)) != 0) 430 return (error); 431 sx_xlock(&in6_control_sx); 432 control_locked = true; 433 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 434 } else 435 ia = NULL; 436 437 switch (cmd) { 438 case SIOCSIFADDR_IN6: 439 case SIOCSIFDSTADDR_IN6: 440 case SIOCSIFNETMASK_IN6: 441 /* 442 * Since IPv6 allows a node to assign multiple addresses 443 * on a single interface, SIOCSIFxxx ioctls are deprecated. 444 */ 445 /* we decided to obsolete this command (20000704) */ 446 error = EINVAL; 447 goto out; 448 449 case SIOCDIFADDR_IN6: 450 /* 451 * for IPv4, we look for existing in_ifaddr here to allow 452 * "ifconfig if0 delete" to remove the first IPv4 address on 453 * the interface. For IPv6, as the spec allows multiple 454 * interface address from the day one, we consider "remove the 455 * first one" semantics to be not preferable. 456 */ 457 if (ia == NULL) { 458 error = EADDRNOTAVAIL; 459 goto out; 460 } 461 /* FALLTHROUGH */ 462 case SIOCAIFADDR_IN6: 463 /* 464 * We always require users to specify a valid IPv6 address for 465 * the corresponding operation. 466 */ 467 if (ifra->ifra_addr.sin6_family != AF_INET6 || 468 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 469 error = EAFNOSUPPORT; 470 goto out; 471 } 472 473 if (cred != NULL) { 474 error = priv_check_cred(cred, (cmd == SIOCDIFADDR_IN6) ? 475 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR); 476 if (error) 477 goto out; 478 } 479 /* FALLTHROUGH */ 480 case SIOCGIFSTAT_IN6: 481 case SIOCGIFSTAT_ICMP6: 482 if (ifp->if_afdata[AF_INET6] == NULL) { 483 error = EPFNOSUPPORT; 484 goto out; 485 } 486 break; 487 488 case SIOCGIFADDR_IN6: 489 /* This interface is basically deprecated. use SIOCGIFCONF. */ 490 /* FALLTHROUGH */ 491 case SIOCGIFAFLAG_IN6: 492 case SIOCGIFNETMASK_IN6: 493 case SIOCGIFDSTADDR_IN6: 494 case SIOCGIFALIFETIME_IN6: 495 /* must think again about its semantics */ 496 if (ia == NULL) { 497 error = EADDRNOTAVAIL; 498 goto out; 499 } 500 break; 501 } 502 503 switch (cmd) { 504 case SIOCGIFADDR_IN6: 505 ifr->ifr_addr = ia->ia_addr; 506 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 507 goto out; 508 break; 509 510 case SIOCGIFDSTADDR_IN6: 511 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 512 error = EINVAL; 513 goto out; 514 } 515 ifr->ifr_dstaddr = ia->ia_dstaddr; 516 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 517 goto out; 518 break; 519 520 case SIOCGIFNETMASK_IN6: 521 ifr->ifr_addr = ia->ia_prefixmask; 522 break; 523 524 case SIOCGIFAFLAG_IN6: 525 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 526 break; 527 528 case SIOCGIFSTAT_IN6: 529 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 530 ifp->if_afdata[AF_INET6])->in6_ifstat, 531 &ifr->ifr_ifru.ifru_stat, 532 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 533 break; 534 535 case SIOCGIFSTAT_ICMP6: 536 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 537 ifp->if_afdata[AF_INET6])->icmp6_ifstat, 538 &ifr->ifr_ifru.ifru_icmp6stat, 539 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 540 break; 541 542 case SIOCGIFALIFETIME_IN6: 543 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 544 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 545 time_t maxexpire; 546 struct in6_addrlifetime *retlt = 547 &ifr->ifr_ifru.ifru_lifetime; 548 549 /* 550 * XXX: adjust expiration time assuming time_t is 551 * signed. 552 */ 553 maxexpire = (-1) & 554 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 555 if (ia->ia6_lifetime.ia6t_vltime < 556 maxexpire - ia->ia6_updatetime) { 557 retlt->ia6t_expire = ia->ia6_updatetime + 558 ia->ia6_lifetime.ia6t_vltime; 559 } else 560 retlt->ia6t_expire = maxexpire; 561 } 562 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 563 time_t maxexpire; 564 struct in6_addrlifetime *retlt = 565 &ifr->ifr_ifru.ifru_lifetime; 566 567 /* 568 * XXX: adjust expiration time assuming time_t is 569 * signed. 570 */ 571 maxexpire = (-1) & 572 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 573 if (ia->ia6_lifetime.ia6t_pltime < 574 maxexpire - ia->ia6_updatetime) { 575 retlt->ia6t_preferred = ia->ia6_updatetime + 576 ia->ia6_lifetime.ia6t_pltime; 577 } else 578 retlt->ia6t_preferred = maxexpire; 579 } 580 break; 581 582 case SIOCAIFADDR_IN6: 583 #ifdef MAC 584 /* Check if a MAC policy disallows setting the IPv6 address. */ 585 error = mac_inet6_check_add_addr(cred, &sa6->sin6_addr, ifp); 586 if (error != 0) 587 goto out; 588 #endif 589 error = in6_addifaddr(ifp, ifra, ia); 590 ia = NULL; 591 goto out; 592 593 case SIOCDIFADDR_IN6: 594 in6_purgeifaddr(ia); 595 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa, 596 IFADDR_EVENT_DEL); 597 break; 598 599 default: 600 if (ifp->if_ioctl == NULL) { 601 error = EOPNOTSUPP; 602 goto out; 603 } 604 error = (*ifp->if_ioctl)(ifp, cmd, data); 605 goto out; 606 } 607 608 error = 0; 609 out: 610 if (control_locked) 611 sx_xunlock(&in6_control_sx); 612 613 if (ia != NULL) 614 ifa_free(&ia->ia_ifa); 615 return (error); 616 } 617 618 int 619 in6_control(struct socket *so, u_long cmd, void *data, 620 struct ifnet *ifp, struct thread *td) 621 { 622 return (in6_control_ioctl(cmd, data, ifp, td ? td->td_ucred : NULL)); 623 } 624 625 static struct in6_multi_mship * 626 in6_joingroup_legacy(struct ifnet *ifp, const struct in6_addr *mcaddr, 627 int *errorp, int delay) 628 { 629 struct in6_multi_mship *imm; 630 int error; 631 632 imm = malloc(sizeof(*imm), M_IP6MADDR, M_NOWAIT); 633 if (imm == NULL) { 634 *errorp = ENOBUFS; 635 return (NULL); 636 } 637 638 delay = (delay * MLD_FASTHZ) / hz; 639 640 error = in6_joingroup(ifp, mcaddr, NULL, &imm->i6mm_maddr, delay); 641 if (error) { 642 *errorp = error; 643 free(imm, M_IP6MADDR); 644 return (NULL); 645 } 646 647 return (imm); 648 } 649 650 static int 651 in6_solicited_node_maddr(struct in6_addr *maddr, 652 struct ifnet *ifp, const struct in6_addr *base) 653 { 654 int error; 655 656 bzero(maddr, sizeof(struct in6_addr)); 657 maddr->s6_addr32[0] = IPV6_ADDR_INT32_MLL; 658 maddr->s6_addr32[2] = htonl(1); 659 maddr->s6_addr32[3] = base->s6_addr32[3]; 660 maddr->s6_addr8[12] = 0xff; 661 if ((error = in6_setscope(maddr, ifp, NULL)) != 0) { 662 /* XXX: should not happen */ 663 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 664 } 665 666 return error; 667 } 668 669 /* 670 * Join necessary multicast groups. Factored out from in6_update_ifa(). 671 * This entire work should only be done once, for the default FIB. 672 */ 673 static int 674 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra, 675 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol) 676 { 677 char ip6buf[INET6_ADDRSTRLEN]; 678 struct in6_addr mltaddr; 679 struct in6_multi_mship *imm; 680 int delay, error; 681 682 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__)); 683 684 /* Join solicited multicast addr for new host id. */ 685 if ((error = in6_solicited_node_maddr(&mltaddr, ifp, 686 &ifra->ifra_addr.sin6_addr)) != 0) 687 goto cleanup; 688 delay = error = 0; 689 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 690 /* 691 * We need a random delay for DAD on the address being 692 * configured. It also means delaying transmission of the 693 * corresponding MLD report to avoid report collision. 694 * [RFC 4861, Section 6.3.7] 695 */ 696 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 697 } 698 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay); 699 if (imm == NULL) { 700 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 701 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 702 if_name(ifp), error)); 703 goto cleanup; 704 } 705 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 706 *in6m_sol = imm->i6mm_maddr; 707 708 /* 709 * Join link-local all-nodes address. 710 */ 711 mltaddr = in6addr_linklocal_allnodes; 712 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 713 goto cleanup; /* XXX: should not fail */ 714 715 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, 0); 716 if (imm == NULL) { 717 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 718 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 719 if_name(ifp), error)); 720 goto cleanup; 721 } 722 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 723 724 /* 725 * Join node information group address. 726 */ 727 delay = 0; 728 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 729 /* 730 * The spec does not say anything about delay for this group, 731 * but the same logic should apply. 732 */ 733 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 734 } 735 if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) { 736 /* XXX jinmei */ 737 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay); 738 if (imm == NULL) 739 nd6log((LOG_WARNING, 740 "%s: in6_joingroup failed for %s on %s " 741 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 742 &mltaddr), if_name(ifp), error)); 743 /* XXX not very fatal, go on... */ 744 else 745 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 746 } 747 if (V_icmp6_nodeinfo_oldmcprefix && 748 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) { 749 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay); 750 if (imm == NULL) 751 nd6log((LOG_WARNING, 752 "%s: in6_joingroup failed for %s on %s " 753 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 754 &mltaddr), if_name(ifp), error)); 755 /* XXX not very fatal, go on... */ 756 else 757 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 758 } 759 760 /* 761 * Join interface-local all-nodes address. 762 * (ff01::1%ifN, and ff01::%ifN/32) 763 */ 764 mltaddr = in6addr_nodelocal_allnodes; 765 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 766 goto cleanup; /* XXX: should not fail */ 767 768 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, 0); 769 if (imm == NULL) { 770 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 771 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 772 &mltaddr), if_name(ifp), error)); 773 goto cleanup; 774 } 775 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 776 777 cleanup: 778 return (error); 779 } 780 781 /* 782 * Update parameters of an IPv6 interface address. 783 * If necessary, a new entry is created and linked into address chains. 784 * This function is separated from in6_control(). 785 */ 786 int 787 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 788 struct in6_ifaddr *ia, int flags) 789 { 790 int error, hostIsNew = 0; 791 792 if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0) 793 return (error); 794 795 if (ia == NULL) { 796 hostIsNew = 1; 797 if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL) 798 return (ENOBUFS); 799 } 800 801 error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags); 802 if (error != 0) { 803 if (hostIsNew != 0) { 804 in6_unlink_ifa(ia, ifp); 805 ifa_free(&ia->ia_ifa); 806 } 807 return (error); 808 } 809 810 if (hostIsNew) 811 error = in6_broadcast_ifa(ifp, ifra, ia, flags); 812 813 return (error); 814 } 815 816 /* 817 * Fill in basic IPv6 address request info. 818 */ 819 void 820 in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr, 821 const struct in6_addr *mask) 822 { 823 824 memset(ifra, 0, sizeof(struct in6_aliasreq)); 825 826 ifra->ifra_addr.sin6_family = AF_INET6; 827 ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 828 if (addr != NULL) 829 ifra->ifra_addr.sin6_addr = *addr; 830 831 ifra->ifra_prefixmask.sin6_family = AF_INET6; 832 ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 833 if (mask != NULL) 834 ifra->ifra_prefixmask.sin6_addr = *mask; 835 } 836 837 static int 838 in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra, 839 struct in6_ifaddr *ia, int flags) 840 { 841 int plen = -1; 842 struct sockaddr_in6 dst6; 843 struct in6_addrlifetime *lt; 844 char ip6buf[INET6_ADDRSTRLEN]; 845 846 /* Validate parameters */ 847 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 848 return (EINVAL); 849 850 /* 851 * The destination address for a p2p link must have a family 852 * of AF_UNSPEC or AF_INET6. 853 */ 854 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 855 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 856 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 857 return (EAFNOSUPPORT); 858 859 /* 860 * Validate address 861 */ 862 if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) || 863 ifra->ifra_addr.sin6_family != AF_INET6) 864 return (EINVAL); 865 866 /* 867 * validate ifra_prefixmask. don't check sin6_family, netmask 868 * does not carry fields other than sin6_len. 869 */ 870 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 871 return (EINVAL); 872 /* 873 * Because the IPv6 address architecture is classless, we require 874 * users to specify a (non 0) prefix length (mask) for a new address. 875 * We also require the prefix (when specified) mask is valid, and thus 876 * reject a non-consecutive mask. 877 */ 878 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 879 return (EINVAL); 880 if (ifra->ifra_prefixmask.sin6_len != 0) { 881 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 882 (u_char *)&ifra->ifra_prefixmask + 883 ifra->ifra_prefixmask.sin6_len); 884 if (plen <= 0) 885 return (EINVAL); 886 } else { 887 /* 888 * In this case, ia must not be NULL. We just use its prefix 889 * length. 890 */ 891 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 892 } 893 /* 894 * If the destination address on a p2p interface is specified, 895 * and the address is a scoped one, validate/set the scope 896 * zone identifier. 897 */ 898 dst6 = ifra->ifra_dstaddr; 899 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 900 (dst6.sin6_family == AF_INET6)) { 901 struct in6_addr in6_tmp; 902 u_int32_t zoneid; 903 904 in6_tmp = dst6.sin6_addr; 905 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 906 return (EINVAL); /* XXX: should be impossible */ 907 908 if (dst6.sin6_scope_id != 0) { 909 if (dst6.sin6_scope_id != zoneid) 910 return (EINVAL); 911 } else /* user omit to specify the ID. */ 912 dst6.sin6_scope_id = zoneid; 913 914 /* convert into the internal form */ 915 if (sa6_embedscope(&dst6, 0)) 916 return (EINVAL); /* XXX: should be impossible */ 917 } 918 /* Modify original ifra_dstaddr to reflect changes */ 919 ifra->ifra_dstaddr = dst6; 920 921 /* 922 * The destination address can be specified only for a p2p or a 923 * loopback interface. If specified, the corresponding prefix length 924 * must be 128. 925 */ 926 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 927 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 928 /* XXX: noisy message */ 929 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 930 "be specified for a p2p or a loopback IF only\n")); 931 return (EINVAL); 932 } 933 if (plen != 128) { 934 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 935 "be 128 when dstaddr is specified\n")); 936 return (EINVAL); 937 } 938 } 939 /* lifetime consistency check */ 940 lt = &ifra->ifra_lifetime; 941 if (lt->ia6t_pltime > lt->ia6t_vltime) 942 return (EINVAL); 943 if (lt->ia6t_vltime == 0) { 944 /* 945 * the following log might be noisy, but this is a typical 946 * configuration mistake or a tool's bug. 947 */ 948 nd6log((LOG_INFO, 949 "in6_update_ifa: valid lifetime is 0 for %s\n", 950 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr))); 951 952 if (ia == NULL) 953 return (0); /* there's nothing to do */ 954 } 955 956 /* Check prefix mask */ 957 if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) { 958 /* 959 * We prohibit changing the prefix length of an existing 960 * address, because 961 * + such an operation should be rare in IPv6, and 962 * + the operation would confuse prefix management. 963 */ 964 if (ia->ia_prefixmask.sin6_len != 0 && 965 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 966 nd6log((LOG_INFO, "in6_validate_ifa: the prefix length " 967 "of an existing %s address should not be changed\n", 968 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 969 970 return (EINVAL); 971 } 972 } 973 974 return (0); 975 } 976 977 /* 978 * Allocate a new ifaddr and link it into chains. 979 */ 980 static struct in6_ifaddr * 981 in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags) 982 { 983 struct in6_ifaddr *ia; 984 985 /* 986 * When in6_alloc_ifa() is called in a process of a received 987 * RA, it is called under an interrupt context. So, we should 988 * call malloc with M_NOWAIT. 989 */ 990 ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT); 991 if (ia == NULL) 992 return (NULL); 993 LIST_INIT(&ia->ia6_memberships); 994 /* Initialize the address and masks, and put time stamp */ 995 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 996 ia->ia_addr.sin6_family = AF_INET6; 997 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 998 /* XXX: Can we assign ,sin6_addr and skip the rest? */ 999 ia->ia_addr = ifra->ifra_addr; 1000 ia->ia6_createtime = time_uptime; 1001 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1002 /* 1003 * Some functions expect that ifa_dstaddr is not 1004 * NULL for p2p interfaces. 1005 */ 1006 ia->ia_ifa.ifa_dstaddr = 1007 (struct sockaddr *)&ia->ia_dstaddr; 1008 } else { 1009 ia->ia_ifa.ifa_dstaddr = NULL; 1010 } 1011 1012 /* set prefix mask if any */ 1013 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 1014 if (ifra->ifra_prefixmask.sin6_len != 0) { 1015 ia->ia_prefixmask.sin6_family = AF_INET6; 1016 ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len; 1017 ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr; 1018 } 1019 1020 ia->ia_ifp = ifp; 1021 ifa_ref(&ia->ia_ifa); /* if_addrhead */ 1022 IF_ADDR_WLOCK(ifp); 1023 CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1024 IF_ADDR_WUNLOCK(ifp); 1025 1026 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */ 1027 IN6_IFADDR_WLOCK(); 1028 CK_STAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link); 1029 CK_LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash); 1030 IN6_IFADDR_WUNLOCK(); 1031 1032 return (ia); 1033 } 1034 1035 /* 1036 * Update/configure interface address parameters: 1037 * 1038 * 1) Update lifetime 1039 * 2) Update interface metric ad flags 1040 * 3) Notify other subsystems 1041 */ 1042 static int 1043 in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra, 1044 struct in6_ifaddr *ia, int hostIsNew, int flags) 1045 { 1046 int error; 1047 1048 /* update timestamp */ 1049 ia->ia6_updatetime = time_uptime; 1050 1051 /* 1052 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1053 * to see if the address is deprecated or invalidated, but initialize 1054 * these members for applications. 1055 */ 1056 ia->ia6_lifetime = ifra->ifra_lifetime; 1057 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1058 ia->ia6_lifetime.ia6t_expire = 1059 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1060 } else 1061 ia->ia6_lifetime.ia6t_expire = 0; 1062 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1063 ia->ia6_lifetime.ia6t_preferred = 1064 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1065 } else 1066 ia->ia6_lifetime.ia6t_preferred = 0; 1067 1068 /* 1069 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1070 * userland, make it deprecated. 1071 */ 1072 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1073 ia->ia6_lifetime.ia6t_pltime = 0; 1074 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1075 } 1076 1077 /* 1078 * configure address flags. 1079 */ 1080 ia->ia6_flags = ifra->ifra_flags; 1081 1082 /* 1083 * Make the address tentative before joining multicast addresses, 1084 * so that corresponding MLD responses would not have a tentative 1085 * source address. 1086 */ 1087 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1088 1089 /* 1090 * DAD should be performed for an new address or addresses on 1091 * an interface with ND6_IFF_IFDISABLED. 1092 */ 1093 if (in6if_do_dad(ifp) && 1094 (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED))) 1095 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1096 1097 /* notify other subsystems */ 1098 error = in6_notify_ifa(ifp, ia, ifra, hostIsNew); 1099 1100 return (error); 1101 } 1102 1103 /* 1104 * Do link-level ifa job: 1105 * 1) Add lle entry for added address 1106 * 2) Notifies routing socket users about new address 1107 * 3) join appropriate multicast group 1108 * 4) start DAD if enabled 1109 */ 1110 static int 1111 in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1112 struct in6_ifaddr *ia, int flags) 1113 { 1114 struct in6_multi *in6m_sol; 1115 int error = 0; 1116 1117 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1118 if ((error = nd6_add_ifa_lle(ia)) != 0) { 1119 in6_purgeaddr(&ia->ia_ifa); 1120 ifa_free(&ia->ia_ifa); 1121 return (error); 1122 } 1123 1124 /* Join necessary multicast groups. */ 1125 in6m_sol = NULL; 1126 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1127 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol); 1128 if (error != 0) { 1129 in6_purgeaddr(&ia->ia_ifa); 1130 ifa_free(&ia->ia_ifa); 1131 return (error); 1132 } 1133 } 1134 1135 /* Perform DAD, if the address is TENTATIVE. */ 1136 if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) { 1137 int delay, mindelay, maxdelay; 1138 1139 delay = 0; 1140 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1141 /* 1142 * We need to impose a delay before sending an NS 1143 * for DAD. Check if we also needed a delay for the 1144 * corresponding MLD message. If we did, the delay 1145 * should be larger than the MLD delay (this could be 1146 * relaxed a bit, but this simple logic is at least 1147 * safe). 1148 * XXX: Break data hiding guidelines and look at 1149 * state for the solicited multicast group. 1150 */ 1151 mindelay = 0; 1152 if (in6m_sol != NULL && 1153 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) { 1154 mindelay = in6m_sol->in6m_timer; 1155 } 1156 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1157 if (maxdelay - mindelay == 0) 1158 delay = 0; 1159 else { 1160 delay = 1161 (arc4random() % (maxdelay - mindelay)) + 1162 mindelay; 1163 } 1164 } 1165 nd6_dad_start((struct ifaddr *)ia, delay); 1166 } 1167 1168 in6_newaddrmsg(ia, RTM_ADD); 1169 ifa_free(&ia->ia_ifa); 1170 return (error); 1171 } 1172 1173 /* 1174 * Adds or deletes interface route for p2p ifa. 1175 * Returns 0 on success or errno. 1176 */ 1177 static int 1178 in6_handle_dstaddr_rtrequest(int cmd, struct in6_ifaddr *ia) 1179 { 1180 struct epoch_tracker et; 1181 struct ifaddr *ifa = &ia->ia_ifa; 1182 int error; 1183 1184 /* Prepare gateway */ 1185 struct sockaddr_dl_short sdl = { 1186 .sdl_family = AF_LINK, 1187 .sdl_len = sizeof(struct sockaddr_dl_short), 1188 .sdl_type = ifa->ifa_ifp->if_type, 1189 .sdl_index = ifa->ifa_ifp->if_index, 1190 }; 1191 1192 struct sockaddr_in6 dst = { 1193 .sin6_family = AF_INET6, 1194 .sin6_len = sizeof(struct sockaddr_in6), 1195 .sin6_addr = ia->ia_dstaddr.sin6_addr, 1196 }; 1197 1198 struct rt_addrinfo info = { 1199 .rti_ifa = ifa, 1200 .rti_ifp = ifa->ifa_ifp, 1201 .rti_flags = RTF_PINNED | RTF_HOST, 1202 .rti_info = { 1203 [RTAX_DST] = (struct sockaddr *)&dst, 1204 [RTAX_GATEWAY] = (struct sockaddr *)&sdl, 1205 }, 1206 }; 1207 /* Don't set additional per-gw filters on removal */ 1208 1209 NET_EPOCH_ENTER(et); 1210 error = rib_handle_ifaddr_info(ifa->ifa_ifp->if_fib, cmd, &info); 1211 NET_EPOCH_EXIT(et); 1212 1213 return (error); 1214 } 1215 1216 static bool 1217 ifa_is_p2p(struct in6_ifaddr *ia) 1218 { 1219 int plen; 1220 1221 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1222 1223 if ((plen == 128) && (ia->ia_dstaddr.sin6_family == AF_INET6) && 1224 !IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &ia->ia_dstaddr.sin6_addr)) 1225 return (true); 1226 1227 return (false); 1228 } 1229 1230 int 1231 in6_addifaddr(struct ifnet *ifp, struct in6_aliasreq *ifra, struct in6_ifaddr *ia) 1232 { 1233 struct nd_prefixctl pr0; 1234 struct nd_prefix *pr; 1235 int carp_attached = 0; 1236 int error; 1237 1238 /* 1239 * Check if bridge wants to allow adding addrs to member interfaces. 1240 */ 1241 if (ifp->if_bridge != NULL && ifp->if_type != IFT_GIF && 1242 bridge_member_ifaddrs_p != NULL) { 1243 if (bridge_member_ifaddrs_p()) { 1244 if_printf(ifp, "WARNING: Assigning an IP address to " 1245 "an interface which is also a bridge member is " 1246 "deprecated and will be unsupported in a future " 1247 "release.\n"); 1248 } else { 1249 error = EINVAL; 1250 goto out; 1251 } 1252 } 1253 1254 /* 1255 * first, make or update the interface address structure, 1256 * and link it to the list. 1257 */ 1258 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 1259 goto out; 1260 if (ia != NULL) { 1261 if (ia->ia_ifa.ifa_carp) 1262 (*carp_detach_p)(&ia->ia_ifa, true); 1263 ifa_free(&ia->ia_ifa); 1264 } 1265 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) == NULL) { 1266 /* 1267 * this can happen when the user specify the 0 valid 1268 * lifetime. 1269 */ 1270 return (0); 1271 } 1272 1273 if (ifra->ifra_vhid > 0) { 1274 if (carp_attach_p != NULL) 1275 error = (*carp_attach_p)(&ia->ia_ifa, 1276 ifra->ifra_vhid); 1277 else 1278 error = EPROTONOSUPPORT; 1279 if (error) 1280 goto out; 1281 else 1282 carp_attached = 1; 1283 } 1284 1285 /* 1286 * then, make the prefix on-link on the interface. 1287 * XXX: we'd rather create the prefix before the address, but 1288 * we need at least one address to install the corresponding 1289 * interface route, so we configure the address first. 1290 */ 1291 1292 /* 1293 * convert mask to prefix length (prefixmask has already 1294 * been validated in in6_update_ifa(). 1295 */ 1296 bzero(&pr0, sizeof(pr0)); 1297 pr0.ndpr_ifp = ifp; 1298 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 1299 NULL); 1300 if (pr0.ndpr_plen == 128) { 1301 /* we don't need to install a host route. */ 1302 goto aifaddr_out; 1303 } 1304 pr0.ndpr_prefix = ifra->ifra_addr; 1305 /* apply the mask for safety. */ 1306 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, 1307 &ifra->ifra_prefixmask.sin6_addr); 1308 1309 /* 1310 * XXX: since we don't have an API to set prefix (not address) 1311 * lifetimes, we just use the same lifetimes as addresses. 1312 * The (temporarily) installed lifetimes can be overridden by 1313 * later advertised RAs (when accept_rtadv is non 0), which is 1314 * an intended behavior. 1315 */ 1316 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 1317 pr0.ndpr_raf_auto = 1318 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 1319 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 1320 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 1321 1322 /* add the prefix if not yet. */ 1323 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 1324 /* 1325 * nd6_prelist_add will install the corresponding 1326 * interface route. 1327 */ 1328 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) { 1329 if (carp_attached) 1330 (*carp_detach_p)(&ia->ia_ifa, false); 1331 goto out; 1332 } 1333 } 1334 1335 /* relate the address to the prefix */ 1336 if (ia->ia6_ndpr == NULL) { 1337 ia->ia6_ndpr = pr; 1338 pr->ndpr_addrcnt++; 1339 1340 /* 1341 * If this is the first autoconf address from the 1342 * prefix, create a temporary address as well 1343 * (when required). 1344 */ 1345 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 1346 V_ip6_use_tempaddr && pr->ndpr_addrcnt == 1) { 1347 int e; 1348 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 1349 log(LOG_NOTICE, "in6_control: failed " 1350 "to create a temporary address, " 1351 "errno=%d\n", e); 1352 } 1353 } 1354 } 1355 nd6_prefix_rele(pr); 1356 1357 /* 1358 * this might affect the status of autoconfigured addresses, 1359 * that is, this address might make other addresses detached. 1360 */ 1361 pfxlist_onlink_check(); 1362 1363 aifaddr_out: 1364 /* 1365 * Try to clear the flag when a new IPv6 address is added 1366 * onto an IFDISABLED interface and it succeeds. 1367 */ 1368 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) { 1369 struct in6_ndireq nd; 1370 1371 memset(&nd, 0, sizeof(nd)); 1372 nd.ndi.flags = ND_IFINFO(ifp)->flags; 1373 nd.ndi.flags &= ~ND6_IFF_IFDISABLED; 1374 if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0) 1375 log(LOG_NOTICE, "SIOCAIFADDR_IN6: " 1376 "SIOCSIFINFO_FLAGS for -ifdisabled " 1377 "failed."); 1378 /* 1379 * Ignore failure of clearing the flag intentionally. 1380 * The failure means address duplication was detected. 1381 */ 1382 } 1383 error = 0; 1384 1385 out: 1386 if (ia != NULL) 1387 ifa_free(&ia->ia_ifa); 1388 return (error); 1389 } 1390 1391 void 1392 in6_purgeaddr(struct ifaddr *ifa) 1393 { 1394 struct ifnet *ifp = ifa->ifa_ifp; 1395 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1396 struct in6_multi_mship *imm; 1397 int error; 1398 1399 if (ifa->ifa_carp) 1400 (*carp_detach_p)(ifa, false); 1401 1402 /* 1403 * Remove the loopback route to the interface address. 1404 * The check for the current setting of "nd6_useloopback" 1405 * is not needed. 1406 */ 1407 if (ia->ia_flags & IFA_RTSELF) { 1408 error = ifa_del_loopback_route((struct ifaddr *)ia, 1409 (struct sockaddr *)&ia->ia_addr); 1410 if (error == 0) 1411 ia->ia_flags &= ~IFA_RTSELF; 1412 } 1413 1414 /* stop DAD processing */ 1415 nd6_dad_stop(ifa); 1416 1417 /* Leave multicast groups. */ 1418 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1419 LIST_REMOVE(imm, i6mm_chain); 1420 if (imm->i6mm_maddr != NULL) 1421 in6_leavegroup(imm->i6mm_maddr, NULL); 1422 free(imm, M_IP6MADDR); 1423 } 1424 /* Check if we need to remove p2p route */ 1425 if ((ia->ia_flags & IFA_ROUTE) && ifa_is_p2p(ia)) { 1426 error = in6_handle_dstaddr_rtrequest(RTM_DELETE, ia); 1427 if (error != 0) 1428 log(LOG_INFO, "%s: err=%d, destination address delete " 1429 "failed\n", __func__, error); 1430 ia->ia_flags &= ~IFA_ROUTE; 1431 } 1432 1433 in6_newaddrmsg(ia, RTM_DELETE); 1434 in6_unlink_ifa(ia, ifp); 1435 } 1436 1437 /* 1438 * Removes @ia from the corresponding interfaces and unlinks corresponding 1439 * prefix if no addresses are using it anymore. 1440 */ 1441 void 1442 in6_purgeifaddr(struct in6_ifaddr *ia) 1443 { 1444 struct nd_prefix *pr; 1445 1446 /* 1447 * If the address being deleted is the only one that owns 1448 * the corresponding prefix, expire the prefix as well. 1449 * XXX: theoretically, we don't have to worry about such 1450 * relationship, since we separate the address management 1451 * and the prefix management. We do this, however, to provide 1452 * as much backward compatibility as possible in terms of 1453 * the ioctl operation. 1454 * Note that in6_purgeaddr() will decrement ndpr_addrcnt. 1455 */ 1456 pr = ia->ia6_ndpr; 1457 in6_purgeaddr(&ia->ia_ifa); 1458 if (pr != NULL && pr->ndpr_addrcnt == 0) { 1459 ND6_WLOCK(); 1460 nd6_prefix_unlink(pr, NULL); 1461 ND6_WUNLOCK(); 1462 nd6_prefix_del(pr); 1463 } 1464 } 1465 1466 1467 static void 1468 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1469 { 1470 char ip6buf[INET6_ADDRSTRLEN]; 1471 int remove_lle; 1472 1473 IF_ADDR_WLOCK(ifp); 1474 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link); 1475 IF_ADDR_WUNLOCK(ifp); 1476 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1477 1478 /* 1479 * Defer the release of what might be the last reference to the 1480 * in6_ifaddr so that it can't be freed before the remainder of the 1481 * cleanup. 1482 */ 1483 IN6_IFADDR_WLOCK(); 1484 CK_STAILQ_REMOVE(&V_in6_ifaddrhead, ia, in6_ifaddr, ia_link); 1485 CK_LIST_REMOVE(ia, ia6_hash); 1486 IN6_IFADDR_WUNLOCK(); 1487 1488 /* 1489 * Release the reference to the base prefix. There should be a 1490 * positive reference. 1491 */ 1492 remove_lle = 0; 1493 if (ia->ia6_ndpr == NULL) { 1494 nd6log((LOG_NOTICE, 1495 "in6_unlink_ifa: autoconf'ed address " 1496 "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia)))); 1497 } else { 1498 ia->ia6_ndpr->ndpr_addrcnt--; 1499 /* Do not delete lles within prefix if refcont != 0 */ 1500 if (ia->ia6_ndpr->ndpr_addrcnt == 0) 1501 remove_lle = 1; 1502 ia->ia6_ndpr = NULL; 1503 } 1504 1505 nd6_rem_ifa_lle(ia, remove_lle); 1506 1507 /* 1508 * Also, if the address being removed is autoconf'ed, call 1509 * pfxlist_onlink_check() since the release might affect the status of 1510 * other (detached) addresses. 1511 */ 1512 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1513 pfxlist_onlink_check(); 1514 } 1515 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1516 } 1517 1518 /* 1519 * Notifies other subsystems about address change/arrival: 1520 * 1) Notifies device handler on the first IPv6 address assignment 1521 * 2) Handle routing table changes for P2P links and route 1522 * 3) Handle routing table changes for address host route 1523 */ 1524 static int 1525 in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia, 1526 struct in6_aliasreq *ifra, int hostIsNew) 1527 { 1528 int error = 0, ifacount = 0; 1529 struct ifaddr *ifa; 1530 struct sockaddr_in6 *pdst; 1531 char ip6buf[INET6_ADDRSTRLEN]; 1532 1533 /* 1534 * Give the interface a chance to initialize 1535 * if this is its first address, 1536 */ 1537 if (hostIsNew != 0) { 1538 struct epoch_tracker et; 1539 1540 NET_EPOCH_ENTER(et); 1541 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1542 if (ifa->ifa_addr->sa_family != AF_INET6) 1543 continue; 1544 ifacount++; 1545 } 1546 NET_EPOCH_EXIT(et); 1547 } 1548 1549 if (ifacount <= 1 && ifp->if_ioctl) { 1550 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1551 if (error) 1552 goto done; 1553 } 1554 1555 /* 1556 * If a new destination address is specified, scrub the old one and 1557 * install the new destination. Note that the interface must be 1558 * p2p or loopback. 1559 */ 1560 pdst = &ifra->ifra_dstaddr; 1561 if (pdst->sin6_family == AF_INET6 && 1562 !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1563 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1564 (in6_handle_dstaddr_rtrequest(RTM_DELETE, ia) != 0)) { 1565 nd6log((LOG_ERR, "in6_update_ifa_internal: failed to " 1566 "remove a route to the old destination: %s\n", 1567 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1568 /* proceed anyway... */ 1569 } else 1570 ia->ia_flags &= ~IFA_ROUTE; 1571 ia->ia_dstaddr = *pdst; 1572 } 1573 1574 /* 1575 * If a new destination address is specified for a point-to-point 1576 * interface, install a route to the destination as an interface 1577 * direct route. 1578 * XXX: the logic below rejects assigning multiple addresses on a p2p 1579 * interface that share the same destination. 1580 */ 1581 if (!(ia->ia_flags & IFA_ROUTE) && ifa_is_p2p(ia)) { 1582 error = in6_handle_dstaddr_rtrequest(RTM_ADD, ia); 1583 if (error) 1584 goto done; 1585 ia->ia_flags |= IFA_ROUTE; 1586 } 1587 1588 /* 1589 * add a loopback route to self if not exists 1590 */ 1591 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) { 1592 error = ifa_add_loopback_route((struct ifaddr *)ia, 1593 (struct sockaddr *)&ia->ia_addr); 1594 if (error == 0) 1595 ia->ia_flags |= IFA_RTSELF; 1596 } 1597 done: 1598 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 1599 "Invoking IPv6 network device address event may sleep"); 1600 1601 ifa_ref(&ia->ia_ifa); 1602 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa, 1603 IFADDR_EVENT_ADD); 1604 ifa_free(&ia->ia_ifa); 1605 1606 return (error); 1607 } 1608 1609 /* 1610 * Find an IPv6 interface link-local address specific to an interface. 1611 * ifaddr is returned referenced. 1612 */ 1613 struct in6_ifaddr * 1614 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1615 { 1616 struct ifaddr *ifa; 1617 1618 NET_EPOCH_ASSERT(); 1619 1620 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1621 if (ifa->ifa_addr->sa_family != AF_INET6) 1622 continue; 1623 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1624 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1625 ignoreflags) != 0) 1626 continue; 1627 ifa_ref(ifa); 1628 break; 1629 } 1630 } 1631 1632 return ((struct in6_ifaddr *)ifa); 1633 } 1634 1635 /* 1636 * find the interface address corresponding to a given IPv6 address. 1637 * ifaddr is returned referenced if @referenced flag is set. 1638 */ 1639 struct in6_ifaddr * 1640 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid, bool referenced) 1641 { 1642 struct rm_priotracker in6_ifa_tracker; 1643 struct in6_ifaddr *ia; 1644 1645 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1646 CK_LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) { 1647 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1648 if (zoneid != 0 && 1649 zoneid != ia->ia_addr.sin6_scope_id) 1650 continue; 1651 if (referenced) 1652 ifa_ref(&ia->ia_ifa); 1653 break; 1654 } 1655 } 1656 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1657 return (ia); 1658 } 1659 1660 /* 1661 * find the internet address corresponding to a given interface and address. 1662 * ifaddr is returned referenced. 1663 */ 1664 struct in6_ifaddr * 1665 in6ifa_ifpwithaddr(struct ifnet *ifp, const struct in6_addr *addr) 1666 { 1667 struct epoch_tracker et; 1668 struct ifaddr *ifa; 1669 1670 NET_EPOCH_ENTER(et); 1671 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1672 if (ifa->ifa_addr->sa_family != AF_INET6) 1673 continue; 1674 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1675 ifa_ref(ifa); 1676 break; 1677 } 1678 } 1679 NET_EPOCH_EXIT(et); 1680 1681 return ((struct in6_ifaddr *)ifa); 1682 } 1683 1684 /* 1685 * Find a link-local scoped address on ifp and return it if any. 1686 */ 1687 struct in6_ifaddr * 1688 in6ifa_llaonifp(struct ifnet *ifp) 1689 { 1690 struct epoch_tracker et; 1691 struct sockaddr_in6 *sin6; 1692 struct ifaddr *ifa; 1693 1694 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1695 return (NULL); 1696 NET_EPOCH_ENTER(et); 1697 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1698 if (ifa->ifa_addr->sa_family != AF_INET6) 1699 continue; 1700 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 1701 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 1702 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) || 1703 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr)) 1704 break; 1705 } 1706 NET_EPOCH_EXIT(et); 1707 1708 return ((struct in6_ifaddr *)ifa); 1709 } 1710 1711 /* 1712 * Convert IP6 address to printable (loggable) representation. Caller 1713 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 1714 */ 1715 static char digits[] = "0123456789abcdef"; 1716 char * 1717 ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 1718 { 1719 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0; 1720 char *cp; 1721 const u_int16_t *a = (const u_int16_t *)addr; 1722 const u_int8_t *d; 1723 int dcolon = 0, zero = 0; 1724 1725 cp = ip6buf; 1726 1727 for (i = 0; i < 8; i++) { 1728 if (*(a + i) == 0) { 1729 cnt++; 1730 if (cnt == 1) 1731 idx = i; 1732 } 1733 else if (maxcnt < cnt) { 1734 maxcnt = cnt; 1735 index = idx; 1736 cnt = 0; 1737 } 1738 } 1739 if (maxcnt < cnt) { 1740 maxcnt = cnt; 1741 index = idx; 1742 } 1743 1744 for (i = 0; i < 8; i++) { 1745 if (dcolon == 1) { 1746 if (*a == 0) { 1747 if (i == 7) 1748 *cp++ = ':'; 1749 a++; 1750 continue; 1751 } else 1752 dcolon = 2; 1753 } 1754 if (*a == 0) { 1755 if (dcolon == 0 && *(a + 1) == 0 && i == index) { 1756 if (i == 0) 1757 *cp++ = ':'; 1758 *cp++ = ':'; 1759 dcolon = 1; 1760 } else { 1761 *cp++ = '0'; 1762 *cp++ = ':'; 1763 } 1764 a++; 1765 continue; 1766 } 1767 d = (const u_char *)a; 1768 /* Try to eliminate leading zeros in printout like in :0001. */ 1769 zero = 1; 1770 *cp = digits[*d >> 4]; 1771 if (*cp != '0') { 1772 zero = 0; 1773 cp++; 1774 } 1775 *cp = digits[*d++ & 0xf]; 1776 if (zero == 0 || (*cp != '0')) { 1777 zero = 0; 1778 cp++; 1779 } 1780 *cp = digits[*d >> 4]; 1781 if (zero == 0 || (*cp != '0')) { 1782 zero = 0; 1783 cp++; 1784 } 1785 *cp++ = digits[*d & 0xf]; 1786 *cp++ = ':'; 1787 a++; 1788 } 1789 *--cp = '\0'; 1790 return (ip6buf); 1791 } 1792 1793 int 1794 in6_localaddr(struct in6_addr *in6) 1795 { 1796 struct rm_priotracker in6_ifa_tracker; 1797 struct in6_ifaddr *ia; 1798 1799 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1800 return 1; 1801 1802 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1803 CK_STAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 1804 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1805 &ia->ia_prefixmask.sin6_addr)) { 1806 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1807 return 1; 1808 } 1809 } 1810 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1811 1812 return (0); 1813 } 1814 1815 /* 1816 * Return 1 if an internet address is for the local host and configured 1817 * on one of its interfaces. 1818 */ 1819 int 1820 in6_localip(struct in6_addr *in6) 1821 { 1822 struct rm_priotracker in6_ifa_tracker; 1823 struct in6_ifaddr *ia; 1824 1825 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1826 CK_LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 1827 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) { 1828 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1829 return (1); 1830 } 1831 } 1832 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1833 return (0); 1834 } 1835 1836 /* 1837 * Like in6_localip(), but FIB-aware and carp(4)-aware. 1838 */ 1839 bool 1840 in6_localip_fib(struct in6_addr *in6, uint16_t fib) 1841 { 1842 struct rm_priotracker in6_ifa_tracker; 1843 struct in6_ifaddr *ia; 1844 1845 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1846 CK_LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 1847 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr) && 1848 (ia->ia_ifa.ifa_carp == NULL || 1849 carp_master_p(&ia->ia_ifa)) && 1850 ia->ia_ifa.ifa_ifp->if_fib == fib) { 1851 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1852 return (true); 1853 } 1854 } 1855 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1856 return (false); 1857 } 1858 1859 /* 1860 * Return 1 if an internet address is configured on an interface. 1861 */ 1862 int 1863 in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr) 1864 { 1865 struct in6_addr in6; 1866 struct ifaddr *ifa; 1867 struct in6_ifaddr *ia6; 1868 1869 NET_EPOCH_ASSERT(); 1870 1871 in6 = *addr; 1872 if (in6_clearscope(&in6)) 1873 return (0); 1874 in6_setscope(&in6, ifp, NULL); 1875 1876 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1877 if (ifa->ifa_addr->sa_family != AF_INET6) 1878 continue; 1879 ia6 = (struct in6_ifaddr *)ifa; 1880 if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) 1881 return (1); 1882 } 1883 1884 return (0); 1885 } 1886 1887 int 1888 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1889 { 1890 struct rm_priotracker in6_ifa_tracker; 1891 struct in6_ifaddr *ia; 1892 1893 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1894 CK_LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) { 1895 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) { 1896 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 1897 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1898 return (1); /* true */ 1899 } 1900 break; 1901 } 1902 } 1903 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1904 1905 return (0); /* false */ 1906 } 1907 1908 /* 1909 * return length of part which dst and src are equal 1910 * hard coding... 1911 */ 1912 int 1913 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1914 { 1915 int match = 0; 1916 u_char *s = (u_char *)src, *d = (u_char *)dst; 1917 u_char *lim = s + 16, r; 1918 1919 while (s < lim) 1920 if ((r = (*d++ ^ *s++)) != 0) { 1921 while (r < 128) { 1922 match++; 1923 r <<= 1; 1924 } 1925 break; 1926 } else 1927 match += 8; 1928 return match; 1929 } 1930 1931 /* XXX: to be scope conscious */ 1932 int 1933 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1934 { 1935 int bytelen, bitlen; 1936 1937 /* sanity check */ 1938 if (0 > len || len > 128) { 1939 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1940 len); 1941 return (0); 1942 } 1943 1944 bytelen = len / 8; 1945 bitlen = len % 8; 1946 1947 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1948 return (0); 1949 if (bitlen != 0 && 1950 p1->s6_addr[bytelen] >> (8 - bitlen) != 1951 p2->s6_addr[bytelen] >> (8 - bitlen)) 1952 return (0); 1953 1954 return (1); 1955 } 1956 1957 void 1958 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1959 { 1960 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1961 int bytelen, bitlen, i; 1962 1963 /* sanity check */ 1964 if (0 > len || len > 128) { 1965 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1966 len); 1967 return; 1968 } 1969 1970 bzero(maskp, sizeof(*maskp)); 1971 bytelen = len / 8; 1972 bitlen = len % 8; 1973 for (i = 0; i < bytelen; i++) 1974 maskp->s6_addr[i] = 0xff; 1975 if (bitlen) 1976 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1977 } 1978 1979 /* 1980 * return the best address out of the same scope. if no address was 1981 * found, return the first valid address from designated IF. 1982 */ 1983 struct in6_ifaddr * 1984 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 1985 { 1986 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 1987 struct ifaddr *ifa; 1988 struct in6_ifaddr *besta = NULL; 1989 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 1990 1991 NET_EPOCH_ASSERT(); 1992 1993 dep[0] = dep[1] = NULL; 1994 1995 /* 1996 * We first look for addresses in the same scope. 1997 * If there is one, return it. 1998 * If two or more, return one which matches the dst longest. 1999 * If none, return one of global addresses assigned other ifs. 2000 */ 2001 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2002 if (ifa->ifa_addr->sa_family != AF_INET6) 2003 continue; 2004 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2005 continue; /* XXX: is there any case to allow anycast? */ 2006 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2007 continue; /* don't use this interface */ 2008 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2009 continue; 2010 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2011 if (V_ip6_use_deprecated) 2012 dep[0] = (struct in6_ifaddr *)ifa; 2013 continue; 2014 } 2015 2016 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2017 /* 2018 * call in6_matchlen() as few as possible 2019 */ 2020 if (besta) { 2021 if (blen == -1) 2022 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2023 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2024 if (tlen > blen) { 2025 blen = tlen; 2026 besta = (struct in6_ifaddr *)ifa; 2027 } 2028 } else 2029 besta = (struct in6_ifaddr *)ifa; 2030 } 2031 } 2032 if (besta) 2033 return (besta); 2034 2035 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2036 if (ifa->ifa_addr->sa_family != AF_INET6) 2037 continue; 2038 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2039 continue; /* XXX: is there any case to allow anycast? */ 2040 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2041 continue; /* don't use this interface */ 2042 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2043 continue; 2044 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2045 if (V_ip6_use_deprecated) 2046 dep[1] = (struct in6_ifaddr *)ifa; 2047 continue; 2048 } 2049 2050 return (struct in6_ifaddr *)ifa; 2051 } 2052 2053 /* use the last-resort values, that are, deprecated addresses */ 2054 if (dep[0]) 2055 return dep[0]; 2056 if (dep[1]) 2057 return dep[1]; 2058 2059 return NULL; 2060 } 2061 2062 /* 2063 * perform DAD when interface becomes IFF_UP. 2064 */ 2065 void 2066 in6_if_up(struct ifnet *ifp) 2067 { 2068 struct epoch_tracker et; 2069 struct ifaddr *ifa; 2070 struct in6_ifaddr *ia; 2071 2072 NET_EPOCH_ENTER(et); 2073 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2074 if (ifa->ifa_addr->sa_family != AF_INET6) 2075 continue; 2076 ia = (struct in6_ifaddr *)ifa; 2077 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2078 /* 2079 * The TENTATIVE flag was likely set by hand 2080 * beforehand, implicitly indicating the need for DAD. 2081 * We may be able to skip the random delay in this 2082 * case, but we impose delays just in case. 2083 */ 2084 nd6_dad_start(ifa, 2085 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 2086 } 2087 } 2088 NET_EPOCH_EXIT(et); 2089 2090 /* 2091 * special cases, like 6to4, are handled in in6_ifattach 2092 */ 2093 in6_ifattach(ifp, NULL); 2094 } 2095 2096 static void 2097 in6_ifevent(void *arg __unused, struct ifnet *ifp, int event) 2098 { 2099 if (event == IFNET_EVENT_UP) 2100 in6_if_up(ifp); 2101 } 2102 2103 static void 2104 in6_init(void *arg __unused) 2105 { 2106 EVENTHANDLER_REGISTER(ifnet_event, in6_ifevent, NULL, EVENTHANDLER_PRI_ANY); 2107 } 2108 SYSINIT(in6_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, in6_init, NULL); 2109 2110 int 2111 in6if_do_dad(struct ifnet *ifp) 2112 { 2113 2114 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 2115 return (0); 2116 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2117 return (0); 2118 if ((ND_IFINFO(ifp)->flags & 2119 (ND6_IFF_IFDISABLED | ND6_IFF_NO_DAD)) != 0) 2120 return (0); 2121 return (1); 2122 } 2123 2124 /* 2125 * Provide the length of interface identifiers to be used for the link attached 2126 * to the given interface. The length should be defined in "IPv6 over 2127 * xxx-link" document. Note that address architecture might also define 2128 * the length for a particular set of address prefixes, regardless of the 2129 * link type. As clarified in rfc2462bis, those two definitions should be 2130 * consistent, and those really are as of August 2004. 2131 */ 2132 int 2133 in6_if2idlen(struct ifnet *ifp) 2134 { 2135 switch (ifp->if_type) { 2136 case IFT_ETHER: /* RFC2464 */ 2137 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2138 case IFT_L2VLAN: /* ditto */ 2139 case IFT_BRIDGE: /* bridge(4) only does Ethernet-like links */ 2140 case IFT_INFINIBAND: 2141 return (64); 2142 case IFT_PPP: /* RFC2472 */ 2143 return (64); 2144 case IFT_FRELAY: /* RFC2590 */ 2145 return (64); 2146 case IFT_IEEE1394: /* RFC3146 */ 2147 return (64); 2148 case IFT_GIF: 2149 return (64); /* draft-ietf-v6ops-mech-v2-07 */ 2150 case IFT_LOOP: 2151 return (64); /* XXX: is this really correct? */ 2152 default: 2153 /* 2154 * Unknown link type: 2155 * It might be controversial to use the today's common constant 2156 * of 64 for these cases unconditionally. For full compliance, 2157 * we should return an error in this case. On the other hand, 2158 * if we simply miss the standard for the link type or a new 2159 * standard is defined for a new link type, the IFID length 2160 * is very likely to be the common constant. As a compromise, 2161 * we always use the constant, but make an explicit notice 2162 * indicating the "unknown" case. 2163 */ 2164 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2165 return (64); 2166 } 2167 } 2168 2169 struct in6_llentry { 2170 struct llentry base; 2171 }; 2172 2173 #define IN6_LLTBL_DEFAULT_HSIZE 32 2174 #define IN6_LLTBL_HASH(k, h) \ 2175 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 2176 2177 /* 2178 * Do actual deallocation of @lle. 2179 */ 2180 static void 2181 in6_lltable_destroy_lle_unlocked(epoch_context_t ctx) 2182 { 2183 struct llentry *lle; 2184 2185 lle = __containerof(ctx, struct llentry, lle_epoch_ctx); 2186 LLE_LOCK_DESTROY(lle); 2187 LLE_REQ_DESTROY(lle); 2188 free(lle, M_LLTABLE); 2189 } 2190 2191 /* 2192 * Called by LLE_FREE_LOCKED when number of references 2193 * drops to zero. 2194 */ 2195 static void 2196 in6_lltable_destroy_lle(struct llentry *lle) 2197 { 2198 2199 LLE_WUNLOCK(lle); 2200 NET_EPOCH_CALL(in6_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx); 2201 } 2202 2203 static struct llentry * 2204 in6_lltable_new(const struct in6_addr *addr6, u_int flags) 2205 { 2206 struct in6_llentry *lle; 2207 2208 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 2209 if (lle == NULL) /* NB: caller generates msg */ 2210 return NULL; 2211 2212 lle->base.r_l3addr.addr6 = *addr6; 2213 lle->base.lle_refcnt = 1; 2214 lle->base.lle_free = in6_lltable_destroy_lle; 2215 LLE_LOCK_INIT(&lle->base); 2216 LLE_REQ_INIT(&lle->base); 2217 callout_init(&lle->base.lle_timer, 1); 2218 2219 return (&lle->base); 2220 } 2221 2222 static int 2223 in6_lltable_match_prefix(const struct sockaddr *saddr, 2224 const struct sockaddr *smask, u_int flags, struct llentry *lle) 2225 { 2226 const struct in6_addr *addr, *mask, *lle_addr; 2227 2228 addr = &((const struct sockaddr_in6 *)saddr)->sin6_addr; 2229 mask = &((const struct sockaddr_in6 *)smask)->sin6_addr; 2230 lle_addr = &lle->r_l3addr.addr6; 2231 2232 if (IN6_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0) 2233 return (0); 2234 2235 if (lle->la_flags & LLE_IFADDR) { 2236 /* 2237 * Delete LLE_IFADDR records IFF address & flag matches. 2238 * Note that addr is the interface address within prefix 2239 * being matched. 2240 */ 2241 if (IN6_ARE_ADDR_EQUAL(addr, lle_addr) && 2242 (flags & LLE_STATIC) != 0) 2243 return (1); 2244 return (0); 2245 } 2246 2247 /* flags & LLE_STATIC means deleting both dynamic and static entries */ 2248 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC)) 2249 return (1); 2250 2251 return (0); 2252 } 2253 2254 static void 2255 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle) 2256 { 2257 struct ifnet *ifp __diagused; 2258 2259 LLE_WLOCK_ASSERT(lle); 2260 KASSERT(llt != NULL, ("lltable is NULL")); 2261 2262 /* Unlink entry from table */ 2263 if ((lle->la_flags & LLE_LINKED) != 0) { 2264 ifp = llt->llt_ifp; 2265 IF_AFDATA_WLOCK_ASSERT(ifp); 2266 lltable_unlink_entry(llt, lle); 2267 } 2268 2269 llentry_free(lle); 2270 } 2271 2272 static int 2273 in6_lltable_rtcheck(struct ifnet *ifp, 2274 u_int flags, 2275 const struct sockaddr *l3addr) 2276 { 2277 const struct sockaddr_in6 *sin6; 2278 struct nhop_object *nh; 2279 struct in6_addr dst; 2280 uint32_t scopeid; 2281 char ip6buf[INET6_ADDRSTRLEN]; 2282 int fibnum; 2283 2284 NET_EPOCH_ASSERT(); 2285 KASSERT(l3addr->sa_family == AF_INET6, 2286 ("sin_family %d", l3addr->sa_family)); 2287 2288 sin6 = (const struct sockaddr_in6 *)l3addr; 2289 in6_splitscope(&sin6->sin6_addr, &dst, &scopeid); 2290 fibnum = V_rt_add_addr_allfibs ? RT_DEFAULT_FIB : ifp->if_fib; 2291 nh = fib6_lookup(fibnum, &dst, scopeid, NHR_NONE, 0); 2292 if (nh && ((nh->nh_flags & NHF_GATEWAY) || nh->nh_ifp != ifp)) { 2293 struct ifaddr *ifa; 2294 /* 2295 * Create an ND6 cache for an IPv6 neighbor 2296 * that is not covered by our own prefix. 2297 */ 2298 ifa = ifaof_ifpforaddr(l3addr, ifp); 2299 if (ifa != NULL) { 2300 return 0; 2301 } 2302 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2303 ip6_sprintf(ip6buf, &sin6->sin6_addr)); 2304 return EINVAL; 2305 } 2306 return 0; 2307 } 2308 2309 static inline uint32_t 2310 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize) 2311 { 2312 2313 return (IN6_LLTBL_HASH(dst->s6_addr32[3], hsize)); 2314 } 2315 2316 static uint32_t 2317 in6_lltable_hash(const struct llentry *lle, uint32_t hsize) 2318 { 2319 2320 return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize)); 2321 } 2322 2323 static void 2324 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 2325 { 2326 struct sockaddr_in6 *sin6; 2327 2328 sin6 = (struct sockaddr_in6 *)sa; 2329 bzero(sin6, sizeof(*sin6)); 2330 sin6->sin6_family = AF_INET6; 2331 sin6->sin6_len = sizeof(*sin6); 2332 sin6->sin6_addr = lle->r_l3addr.addr6; 2333 } 2334 2335 static inline struct llentry * 2336 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst) 2337 { 2338 struct llentry *lle; 2339 struct llentries *lleh; 2340 u_int hashidx; 2341 2342 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize); 2343 lleh = &llt->lle_head[hashidx]; 2344 CK_LIST_FOREACH(lle, lleh, lle_next) { 2345 if (lle->la_flags & LLE_DELETED) 2346 continue; 2347 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst)) 2348 break; 2349 } 2350 2351 return (lle); 2352 } 2353 2354 static void 2355 in6_lltable_delete_entry(struct lltable *llt, struct llentry *lle) 2356 { 2357 2358 lle->la_flags |= LLE_DELETED; 2359 2360 /* Leave the solicited multicast group. */ 2361 if ((lle->la_flags & LLE_PUB) != 0) 2362 in6_leave_proxy_ndp_mc(llt->llt_ifp, &lle->r_l3addr.addr6); 2363 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 2364 #ifdef DIAGNOSTIC 2365 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2366 #endif 2367 llentry_free(lle); 2368 } 2369 2370 static struct llentry * 2371 in6_lltable_alloc(struct lltable *llt, u_int flags, 2372 const struct sockaddr *l3addr) 2373 { 2374 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2375 struct ifnet *ifp = llt->llt_ifp; 2376 struct llentry *lle; 2377 char linkhdr[LLE_MAX_LINKHDR]; 2378 size_t linkhdrsize; 2379 int lladdr_off; 2380 2381 KASSERT(l3addr->sa_family == AF_INET6, 2382 ("sin_family %d", l3addr->sa_family)); 2383 2384 /* 2385 * A route that covers the given address must have 2386 * been installed 1st because we are doing a resolution, 2387 * verify this. 2388 */ 2389 if (!(flags & LLE_IFADDR) && 2390 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2391 return (NULL); 2392 2393 lle = in6_lltable_new(&sin6->sin6_addr, flags); 2394 if (lle == NULL) { 2395 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2396 return (NULL); 2397 } 2398 lle->la_flags = flags; 2399 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 2400 linkhdrsize = LLE_MAX_LINKHDR; 2401 if (lltable_calc_llheader(ifp, AF_INET6, IF_LLADDR(ifp), 2402 linkhdr, &linkhdrsize, &lladdr_off) != 0) { 2403 in6_lltable_free_entry(llt, lle); 2404 return (NULL); 2405 } 2406 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize, 2407 lladdr_off); 2408 lle->la_flags |= LLE_STATIC; 2409 } 2410 2411 if ((lle->la_flags & LLE_STATIC) != 0) 2412 lle->ln_state = ND6_LLINFO_REACHABLE; 2413 2414 return (lle); 2415 } 2416 2417 static struct llentry * 2418 in6_lltable_lookup(struct lltable *llt, u_int flags, 2419 const struct sockaddr *l3addr) 2420 { 2421 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2422 int family = flags >> 16; 2423 struct llentry *lle; 2424 2425 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 2426 KASSERT(l3addr->sa_family == AF_INET6, 2427 ("sin_family %d", l3addr->sa_family)); 2428 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) != 2429 (LLE_UNLOCKED | LLE_EXCLUSIVE), 2430 ("wrong lle request flags: %#x", flags)); 2431 2432 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2433 2434 if (__predict_false(family != AF_INET6)) 2435 lle = llentry_lookup_family(lle, family); 2436 2437 if (lle == NULL) 2438 return (NULL); 2439 2440 if (flags & LLE_UNLOCKED) 2441 return (lle); 2442 2443 if (flags & LLE_EXCLUSIVE) 2444 LLE_WLOCK(lle); 2445 else 2446 LLE_RLOCK(lle); 2447 2448 /* 2449 * If the afdata lock is not held, the LLE may have been unlinked while 2450 * we were blocked on the LLE lock. Check for this case. 2451 */ 2452 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) { 2453 if (flags & LLE_EXCLUSIVE) 2454 LLE_WUNLOCK(lle); 2455 else 2456 LLE_RUNLOCK(lle); 2457 return (NULL); 2458 } 2459 return (lle); 2460 } 2461 2462 static int 2463 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 2464 struct sysctl_req *wr) 2465 { 2466 struct ifnet *ifp = llt->llt_ifp; 2467 /* XXX stack use */ 2468 struct { 2469 struct rt_msghdr rtm; 2470 struct sockaddr_in6 sin6; 2471 /* 2472 * ndp.c assumes that sdl is word aligned 2473 */ 2474 #ifdef __LP64__ 2475 uint32_t pad; 2476 #endif 2477 struct sockaddr_dl sdl; 2478 } ndpc; 2479 struct sockaddr_dl *sdl; 2480 int error; 2481 2482 bzero(&ndpc, sizeof(ndpc)); 2483 /* skip deleted entries */ 2484 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 2485 return (0); 2486 /* Skip if jailed and not a valid IP of the prison. */ 2487 lltable_fill_sa_entry(lle, (struct sockaddr *)&ndpc.sin6); 2488 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&ndpc.sin6) != 0) 2489 return (0); 2490 /* 2491 * produce a msg made of: 2492 * struct rt_msghdr; 2493 * struct sockaddr_in6 (IPv6) 2494 * struct sockaddr_dl; 2495 */ 2496 ndpc.rtm.rtm_msglen = sizeof(ndpc); 2497 ndpc.rtm.rtm_version = RTM_VERSION; 2498 ndpc.rtm.rtm_type = RTM_GET; 2499 ndpc.rtm.rtm_flags = RTF_UP; 2500 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 2501 sa6_recoverscope(&ndpc.sin6); 2502 2503 /* publish */ 2504 if (lle->la_flags & LLE_PUB) 2505 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE; 2506 2507 sdl = &ndpc.sdl; 2508 sdl->sdl_family = AF_LINK; 2509 sdl->sdl_len = sizeof(*sdl); 2510 sdl->sdl_index = ifp->if_index; 2511 sdl->sdl_type = ifp->if_type; 2512 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 2513 sdl->sdl_alen = ifp->if_addrlen; 2514 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 2515 } else { 2516 sdl->sdl_alen = 0; 2517 bzero(LLADDR(sdl), ifp->if_addrlen); 2518 } 2519 if (lle->la_expire != 0) 2520 ndpc.rtm.rtm_rmx.rmx_expire = lle->la_expire + 2521 lle->lle_remtime / hz + time_second - time_uptime; 2522 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 2523 if (lle->la_flags & LLE_STATIC) 2524 ndpc.rtm.rtm_flags |= RTF_STATIC; 2525 if (lle->la_flags & LLE_IFADDR) 2526 ndpc.rtm.rtm_flags |= RTF_PINNED; 2527 if (lle->ln_router != 0) 2528 ndpc.rtm.rtm_flags |= RTF_GATEWAY; 2529 ndpc.rtm.rtm_rmx.rmx_pksent = lle->la_asked; 2530 /* Store state in rmx_weight value */ 2531 ndpc.rtm.rtm_rmx.rmx_state = lle->ln_state; 2532 ndpc.rtm.rtm_index = ifp->if_index; 2533 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc)); 2534 2535 return (error); 2536 } 2537 2538 static void 2539 in6_lltable_post_resolved(struct lltable *llt, struct llentry *lle) 2540 { 2541 /* Join the solicited multicast group for dst. */ 2542 if ((lle->la_flags & LLE_PUB) == LLE_PUB) 2543 in6_join_proxy_ndp_mc(llt->llt_ifp, &lle->r_l3addr.addr6); 2544 } 2545 2546 static struct lltable * 2547 in6_lltattach(struct ifnet *ifp) 2548 { 2549 struct lltable *llt; 2550 2551 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE); 2552 llt->llt_af = AF_INET6; 2553 llt->llt_ifp = ifp; 2554 2555 llt->llt_lookup = in6_lltable_lookup; 2556 llt->llt_alloc_entry = in6_lltable_alloc; 2557 llt->llt_delete_entry = in6_lltable_delete_entry; 2558 llt->llt_dump_entry = in6_lltable_dump_entry; 2559 llt->llt_hash = in6_lltable_hash; 2560 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry; 2561 llt->llt_free_entry = in6_lltable_free_entry; 2562 llt->llt_match_prefix = in6_lltable_match_prefix; 2563 llt->llt_mark_used = llentry_mark_used; 2564 llt->llt_post_resolved = in6_lltable_post_resolved; 2565 lltable_link(llt); 2566 2567 return (llt); 2568 } 2569 2570 struct lltable * 2571 in6_lltable_get(struct ifnet *ifp) 2572 { 2573 struct lltable *llt = NULL; 2574 2575 void *afdata_ptr = ifp->if_afdata[AF_INET6]; 2576 if (afdata_ptr != NULL) 2577 llt = ((struct in6_ifextra *)afdata_ptr)->lltable; 2578 return (llt); 2579 } 2580 2581 void * 2582 in6_domifattach(struct ifnet *ifp) 2583 { 2584 struct in6_ifextra *ext; 2585 2586 /* There are not IPv6-capable interfaces. */ 2587 switch (ifp->if_type) { 2588 case IFT_PFLOG: 2589 case IFT_PFSYNC: 2590 case IFT_USB: 2591 return (NULL); 2592 } 2593 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2594 bzero(ext, sizeof(*ext)); 2595 2596 ext->in6_ifstat = malloc(sizeof(counter_u64_t) * 2597 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK); 2598 COUNTER_ARRAY_ALLOC(ext->in6_ifstat, 2599 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK); 2600 2601 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) * 2602 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR, 2603 M_WAITOK); 2604 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat, 2605 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK); 2606 2607 ext->dad_failures = counter_u64_alloc(M_WAITOK); 2608 2609 ext->nd_ifinfo = nd6_ifattach(ifp); 2610 ext->scope6_id = scope6_ifattach(ifp); 2611 ext->lltable = in6_lltattach(ifp); 2612 2613 ext->mld_ifinfo = mld_domifattach(ifp); 2614 2615 return ext; 2616 } 2617 2618 int 2619 in6_domifmtu(struct ifnet *ifp) 2620 { 2621 if (ifp->if_afdata[AF_INET6] == NULL) 2622 return ifp->if_mtu; 2623 2624 return (IN6_LINKMTU(ifp)); 2625 } 2626 2627 void 2628 in6_domifdetach(struct ifnet *ifp, void *aux) 2629 { 2630 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2631 2632 MPASS(ifp->if_afdata[AF_INET6] == NULL); 2633 2634 mld_domifdetach(ifp); 2635 scope6_ifdetach(ext->scope6_id); 2636 nd6_ifdetach(ifp, ext->nd_ifinfo); 2637 lltable_free(ext->lltable); 2638 COUNTER_ARRAY_FREE(ext->in6_ifstat, 2639 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 2640 free(ext->in6_ifstat, M_IFADDR); 2641 COUNTER_ARRAY_FREE(ext->icmp6_ifstat, 2642 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 2643 free(ext->icmp6_ifstat, M_IFADDR); 2644 counter_u64_free(ext->dad_failures); 2645 free(ext, M_IFADDR); 2646 } 2647 2648 /* 2649 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2650 * v4 mapped addr or v4 compat addr 2651 */ 2652 void 2653 in6_sin6_2_sin(struct sockaddr_in *sin, const struct sockaddr_in6 *sin6) 2654 { 2655 2656 bzero(sin, sizeof(*sin)); 2657 sin->sin_len = sizeof(struct sockaddr_in); 2658 sin->sin_family = AF_INET; 2659 sin->sin_port = sin6->sin6_port; 2660 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2661 } 2662 2663 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2664 void 2665 in6_sin_2_v4mapsin6(const struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2666 { 2667 bzero(sin6, sizeof(*sin6)); 2668 sin6->sin6_len = sizeof(struct sockaddr_in6); 2669 sin6->sin6_family = AF_INET6; 2670 sin6->sin6_port = sin->sin_port; 2671 sin6->sin6_addr.s6_addr32[0] = 0; 2672 sin6->sin6_addr.s6_addr32[1] = 0; 2673 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2674 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2675 } 2676 2677 /* Convert sockaddr_in6 into sockaddr_in. */ 2678 void 2679 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2680 { 2681 struct sockaddr_in *sin_p; 2682 struct sockaddr_in6 sin6; 2683 2684 /* 2685 * Save original sockaddr_in6 addr and convert it 2686 * to sockaddr_in. 2687 */ 2688 sin6 = *(struct sockaddr_in6 *)nam; 2689 sin_p = (struct sockaddr_in *)nam; 2690 in6_sin6_2_sin(sin_p, &sin6); 2691 } 2692 2693 /* 2694 * Join/leave the solicited multicast groups for proxy NDP entries. 2695 */ 2696 static void 2697 in6_join_proxy_ndp_mc(struct ifnet *ifp, const struct in6_addr *dst) 2698 { 2699 struct in6_multi *inm; 2700 struct in6_addr mltaddr; 2701 char ip6buf[INET6_ADDRSTRLEN]; 2702 int error; 2703 2704 if (in6_solicited_node_maddr(&mltaddr, ifp, dst) != 0) 2705 return; /* error logged in in6_solicited_node_maddr. */ 2706 2707 error = in6_joingroup(ifp, &mltaddr, NULL, &inm, 0); 2708 if (error != 0) { 2709 nd6log((LOG_WARNING, 2710 "%s: in6_joingroup failed for %s on %s (errno=%d)\n", 2711 __func__, ip6_sprintf(ip6buf, &mltaddr), if_name(ifp), 2712 error)); 2713 } 2714 } 2715 2716 static void 2717 in6_leave_proxy_ndp_mc(struct ifnet *ifp, const struct in6_addr *dst) 2718 { 2719 struct epoch_tracker et; 2720 struct in6_multi *inm; 2721 struct in6_addr mltaddr; 2722 char ip6buf[INET6_ADDRSTRLEN]; 2723 2724 if (in6_solicited_node_maddr(&mltaddr, ifp, dst) != 0) 2725 return; /* error logged in in6_solicited_node_maddr. */ 2726 2727 NET_EPOCH_ENTER(et); 2728 inm = in6m_lookup(ifp, &mltaddr); 2729 NET_EPOCH_EXIT(et); 2730 if (inm != NULL) 2731 in6_leavegroup(inm, NULL); 2732 else 2733 nd6log((LOG_WARNING, "%s: in6m_lookup failed for %s on %s\n", 2734 __func__, ip6_sprintf(ip6buf, &mltaddr), if_name(ifp))); 2735 } 2736 2737 static bool 2738 in6_lle_match_pub(struct lltable *llt, struct llentry *lle, void *farg) 2739 { 2740 return ((lle->la_flags & LLE_PUB) != 0); 2741 } 2742 2743 void 2744 in6_purge_proxy_ndp(struct ifnet *ifp) 2745 { 2746 struct lltable *llt; 2747 bool need_purge; 2748 2749 if (ifp->if_afdata[AF_INET6] == NULL) 2750 return; 2751 2752 llt = LLTABLE6(ifp); 2753 IF_AFDATA_WLOCK(ifp); 2754 need_purge = ((llt->llt_flags & LLT_ADDEDPROXY) != 0); 2755 IF_AFDATA_WUNLOCK(ifp); 2756 2757 /* 2758 * Ever added proxy ndp entries, leave solicited node multicast 2759 * before deleting the llentry. 2760 */ 2761 if (need_purge) 2762 lltable_delete_conditional(llt, in6_lle_match_pub, NULL); 2763 } 2764