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 /* Check if this interface is a bridge member */ 1239 if (ifp->if_bridge && bridge_member_ifaddrs_p && 1240 !bridge_member_ifaddrs_p()) { 1241 error = EINVAL; 1242 goto out; 1243 } 1244 1245 /* 1246 * first, make or update the interface address structure, 1247 * and link it to the list. 1248 */ 1249 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 1250 goto out; 1251 if (ia != NULL) { 1252 if (ia->ia_ifa.ifa_carp) 1253 (*carp_detach_p)(&ia->ia_ifa, true); 1254 ifa_free(&ia->ia_ifa); 1255 } 1256 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) == NULL) { 1257 /* 1258 * this can happen when the user specify the 0 valid 1259 * lifetime. 1260 */ 1261 return (0); 1262 } 1263 1264 if (ifra->ifra_vhid > 0) { 1265 if (carp_attach_p != NULL) 1266 error = (*carp_attach_p)(&ia->ia_ifa, 1267 ifra->ifra_vhid); 1268 else 1269 error = EPROTONOSUPPORT; 1270 if (error) 1271 goto out; 1272 else 1273 carp_attached = 1; 1274 } 1275 1276 /* 1277 * then, make the prefix on-link on the interface. 1278 * XXX: we'd rather create the prefix before the address, but 1279 * we need at least one address to install the corresponding 1280 * interface route, so we configure the address first. 1281 */ 1282 1283 /* 1284 * convert mask to prefix length (prefixmask has already 1285 * been validated in in6_update_ifa(). 1286 */ 1287 bzero(&pr0, sizeof(pr0)); 1288 pr0.ndpr_ifp = ifp; 1289 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 1290 NULL); 1291 if (pr0.ndpr_plen == 128) { 1292 /* we don't need to install a host route. */ 1293 goto aifaddr_out; 1294 } 1295 pr0.ndpr_prefix = ifra->ifra_addr; 1296 /* apply the mask for safety. */ 1297 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, 1298 &ifra->ifra_prefixmask.sin6_addr); 1299 1300 /* 1301 * XXX: since we don't have an API to set prefix (not address) 1302 * lifetimes, we just use the same lifetimes as addresses. 1303 * The (temporarily) installed lifetimes can be overridden by 1304 * later advertised RAs (when accept_rtadv is non 0), which is 1305 * an intended behavior. 1306 */ 1307 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 1308 pr0.ndpr_raf_auto = 1309 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 1310 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 1311 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 1312 1313 /* add the prefix if not yet. */ 1314 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 1315 /* 1316 * nd6_prelist_add will install the corresponding 1317 * interface route. 1318 */ 1319 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) { 1320 if (carp_attached) 1321 (*carp_detach_p)(&ia->ia_ifa, false); 1322 goto out; 1323 } 1324 } 1325 1326 /* relate the address to the prefix */ 1327 if (ia->ia6_ndpr == NULL) { 1328 ia->ia6_ndpr = pr; 1329 pr->ndpr_addrcnt++; 1330 1331 /* 1332 * If this is the first autoconf address from the 1333 * prefix, create a temporary address as well 1334 * (when required). 1335 */ 1336 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 1337 V_ip6_use_tempaddr && pr->ndpr_addrcnt == 1) { 1338 int e; 1339 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 1340 log(LOG_NOTICE, "in6_control: failed " 1341 "to create a temporary address, " 1342 "errno=%d\n", e); 1343 } 1344 } 1345 } 1346 nd6_prefix_rele(pr); 1347 1348 /* 1349 * this might affect the status of autoconfigured addresses, 1350 * that is, this address might make other addresses detached. 1351 */ 1352 pfxlist_onlink_check(); 1353 1354 aifaddr_out: 1355 /* 1356 * Try to clear the flag when a new IPv6 address is added 1357 * onto an IFDISABLED interface and it succeeds. 1358 */ 1359 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) { 1360 struct in6_ndireq nd; 1361 1362 memset(&nd, 0, sizeof(nd)); 1363 nd.ndi.flags = ND_IFINFO(ifp)->flags; 1364 nd.ndi.flags &= ~ND6_IFF_IFDISABLED; 1365 if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0) 1366 log(LOG_NOTICE, "SIOCAIFADDR_IN6: " 1367 "SIOCSIFINFO_FLAGS for -ifdisabled " 1368 "failed."); 1369 /* 1370 * Ignore failure of clearing the flag intentionally. 1371 * The failure means address duplication was detected. 1372 */ 1373 } 1374 error = 0; 1375 1376 out: 1377 if (ia != NULL) 1378 ifa_free(&ia->ia_ifa); 1379 return (error); 1380 } 1381 1382 void 1383 in6_purgeaddr(struct ifaddr *ifa) 1384 { 1385 struct ifnet *ifp = ifa->ifa_ifp; 1386 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1387 struct in6_multi_mship *imm; 1388 int error; 1389 1390 if (ifa->ifa_carp) 1391 (*carp_detach_p)(ifa, false); 1392 1393 /* 1394 * Remove the loopback route to the interface address. 1395 * The check for the current setting of "nd6_useloopback" 1396 * is not needed. 1397 */ 1398 if (ia->ia_flags & IFA_RTSELF) { 1399 error = ifa_del_loopback_route((struct ifaddr *)ia, 1400 (struct sockaddr *)&ia->ia_addr); 1401 if (error == 0) 1402 ia->ia_flags &= ~IFA_RTSELF; 1403 } 1404 1405 /* stop DAD processing */ 1406 nd6_dad_stop(ifa); 1407 1408 /* Leave multicast groups. */ 1409 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1410 LIST_REMOVE(imm, i6mm_chain); 1411 if (imm->i6mm_maddr != NULL) 1412 in6_leavegroup(imm->i6mm_maddr, NULL); 1413 free(imm, M_IP6MADDR); 1414 } 1415 /* Check if we need to remove p2p route */ 1416 if ((ia->ia_flags & IFA_ROUTE) && ifa_is_p2p(ia)) { 1417 error = in6_handle_dstaddr_rtrequest(RTM_DELETE, ia); 1418 if (error != 0) 1419 log(LOG_INFO, "%s: err=%d, destination address delete " 1420 "failed\n", __func__, error); 1421 ia->ia_flags &= ~IFA_ROUTE; 1422 } 1423 1424 in6_newaddrmsg(ia, RTM_DELETE); 1425 in6_unlink_ifa(ia, ifp); 1426 } 1427 1428 /* 1429 * Removes @ia from the corresponding interfaces and unlinks corresponding 1430 * prefix if no addresses are using it anymore. 1431 */ 1432 void 1433 in6_purgeifaddr(struct in6_ifaddr *ia) 1434 { 1435 struct nd_prefix *pr; 1436 1437 /* 1438 * If the address being deleted is the only one that owns 1439 * the corresponding prefix, expire the prefix as well. 1440 * XXX: theoretically, we don't have to worry about such 1441 * relationship, since we separate the address management 1442 * and the prefix management. We do this, however, to provide 1443 * as much backward compatibility as possible in terms of 1444 * the ioctl operation. 1445 * Note that in6_purgeaddr() will decrement ndpr_addrcnt. 1446 */ 1447 pr = ia->ia6_ndpr; 1448 in6_purgeaddr(&ia->ia_ifa); 1449 if (pr != NULL && pr->ndpr_addrcnt == 0) { 1450 ND6_WLOCK(); 1451 nd6_prefix_unlink(pr, NULL); 1452 ND6_WUNLOCK(); 1453 nd6_prefix_del(pr); 1454 } 1455 } 1456 1457 1458 static void 1459 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1460 { 1461 char ip6buf[INET6_ADDRSTRLEN]; 1462 int remove_lle; 1463 1464 IF_ADDR_WLOCK(ifp); 1465 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link); 1466 IF_ADDR_WUNLOCK(ifp); 1467 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1468 1469 /* 1470 * Defer the release of what might be the last reference to the 1471 * in6_ifaddr so that it can't be freed before the remainder of the 1472 * cleanup. 1473 */ 1474 IN6_IFADDR_WLOCK(); 1475 CK_STAILQ_REMOVE(&V_in6_ifaddrhead, ia, in6_ifaddr, ia_link); 1476 CK_LIST_REMOVE(ia, ia6_hash); 1477 IN6_IFADDR_WUNLOCK(); 1478 1479 /* 1480 * Release the reference to the base prefix. There should be a 1481 * positive reference. 1482 */ 1483 remove_lle = 0; 1484 if (ia->ia6_ndpr == NULL) { 1485 nd6log((LOG_NOTICE, 1486 "in6_unlink_ifa: autoconf'ed address " 1487 "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia)))); 1488 } else { 1489 ia->ia6_ndpr->ndpr_addrcnt--; 1490 /* Do not delete lles within prefix if refcont != 0 */ 1491 if (ia->ia6_ndpr->ndpr_addrcnt == 0) 1492 remove_lle = 1; 1493 ia->ia6_ndpr = NULL; 1494 } 1495 1496 nd6_rem_ifa_lle(ia, remove_lle); 1497 1498 /* 1499 * Also, if the address being removed is autoconf'ed, call 1500 * pfxlist_onlink_check() since the release might affect the status of 1501 * other (detached) addresses. 1502 */ 1503 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1504 pfxlist_onlink_check(); 1505 } 1506 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1507 } 1508 1509 /* 1510 * Notifies other subsystems about address change/arrival: 1511 * 1) Notifies device handler on the first IPv6 address assignment 1512 * 2) Handle routing table changes for P2P links and route 1513 * 3) Handle routing table changes for address host route 1514 */ 1515 static int 1516 in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia, 1517 struct in6_aliasreq *ifra, int hostIsNew) 1518 { 1519 int error = 0, ifacount = 0; 1520 struct ifaddr *ifa; 1521 struct sockaddr_in6 *pdst; 1522 char ip6buf[INET6_ADDRSTRLEN]; 1523 1524 /* 1525 * Give the interface a chance to initialize 1526 * if this is its first address, 1527 */ 1528 if (hostIsNew != 0) { 1529 struct epoch_tracker et; 1530 1531 NET_EPOCH_ENTER(et); 1532 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1533 if (ifa->ifa_addr->sa_family != AF_INET6) 1534 continue; 1535 ifacount++; 1536 } 1537 NET_EPOCH_EXIT(et); 1538 } 1539 1540 if (ifacount <= 1 && ifp->if_ioctl) { 1541 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1542 if (error) 1543 goto done; 1544 } 1545 1546 /* 1547 * If a new destination address is specified, scrub the old one and 1548 * install the new destination. Note that the interface must be 1549 * p2p or loopback. 1550 */ 1551 pdst = &ifra->ifra_dstaddr; 1552 if (pdst->sin6_family == AF_INET6 && 1553 !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1554 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1555 (in6_handle_dstaddr_rtrequest(RTM_DELETE, ia) != 0)) { 1556 nd6log((LOG_ERR, "in6_update_ifa_internal: failed to " 1557 "remove a route to the old destination: %s\n", 1558 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1559 /* proceed anyway... */ 1560 } else 1561 ia->ia_flags &= ~IFA_ROUTE; 1562 ia->ia_dstaddr = *pdst; 1563 } 1564 1565 /* 1566 * If a new destination address is specified for a point-to-point 1567 * interface, install a route to the destination as an interface 1568 * direct route. 1569 * XXX: the logic below rejects assigning multiple addresses on a p2p 1570 * interface that share the same destination. 1571 */ 1572 if (!(ia->ia_flags & IFA_ROUTE) && ifa_is_p2p(ia)) { 1573 error = in6_handle_dstaddr_rtrequest(RTM_ADD, ia); 1574 if (error) 1575 goto done; 1576 ia->ia_flags |= IFA_ROUTE; 1577 } 1578 1579 /* 1580 * add a loopback route to self if not exists 1581 */ 1582 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) { 1583 error = ifa_add_loopback_route((struct ifaddr *)ia, 1584 (struct sockaddr *)&ia->ia_addr); 1585 if (error == 0) 1586 ia->ia_flags |= IFA_RTSELF; 1587 } 1588 done: 1589 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 1590 "Invoking IPv6 network device address event may sleep"); 1591 1592 ifa_ref(&ia->ia_ifa); 1593 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa, 1594 IFADDR_EVENT_ADD); 1595 ifa_free(&ia->ia_ifa); 1596 1597 return (error); 1598 } 1599 1600 /* 1601 * Find an IPv6 interface link-local address specific to an interface. 1602 * ifaddr is returned referenced. 1603 */ 1604 struct in6_ifaddr * 1605 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1606 { 1607 struct ifaddr *ifa; 1608 1609 NET_EPOCH_ASSERT(); 1610 1611 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1612 if (ifa->ifa_addr->sa_family != AF_INET6) 1613 continue; 1614 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1615 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1616 ignoreflags) != 0) 1617 continue; 1618 ifa_ref(ifa); 1619 break; 1620 } 1621 } 1622 1623 return ((struct in6_ifaddr *)ifa); 1624 } 1625 1626 /* 1627 * find the interface address corresponding to a given IPv6 address. 1628 * ifaddr is returned referenced if @referenced flag is set. 1629 */ 1630 struct in6_ifaddr * 1631 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid, bool referenced) 1632 { 1633 struct rm_priotracker in6_ifa_tracker; 1634 struct in6_ifaddr *ia; 1635 1636 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1637 CK_LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) { 1638 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1639 if (zoneid != 0 && 1640 zoneid != ia->ia_addr.sin6_scope_id) 1641 continue; 1642 if (referenced) 1643 ifa_ref(&ia->ia_ifa); 1644 break; 1645 } 1646 } 1647 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1648 return (ia); 1649 } 1650 1651 /* 1652 * find the internet address corresponding to a given interface and address. 1653 * ifaddr is returned referenced. 1654 */ 1655 struct in6_ifaddr * 1656 in6ifa_ifpwithaddr(struct ifnet *ifp, const struct in6_addr *addr) 1657 { 1658 struct epoch_tracker et; 1659 struct ifaddr *ifa; 1660 1661 NET_EPOCH_ENTER(et); 1662 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1663 if (ifa->ifa_addr->sa_family != AF_INET6) 1664 continue; 1665 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1666 ifa_ref(ifa); 1667 break; 1668 } 1669 } 1670 NET_EPOCH_EXIT(et); 1671 1672 return ((struct in6_ifaddr *)ifa); 1673 } 1674 1675 /* 1676 * Find a link-local scoped address on ifp and return it if any. 1677 */ 1678 struct in6_ifaddr * 1679 in6ifa_llaonifp(struct ifnet *ifp) 1680 { 1681 struct epoch_tracker et; 1682 struct sockaddr_in6 *sin6; 1683 struct ifaddr *ifa; 1684 1685 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1686 return (NULL); 1687 NET_EPOCH_ENTER(et); 1688 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1689 if (ifa->ifa_addr->sa_family != AF_INET6) 1690 continue; 1691 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 1692 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 1693 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) || 1694 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr)) 1695 break; 1696 } 1697 NET_EPOCH_EXIT(et); 1698 1699 return ((struct in6_ifaddr *)ifa); 1700 } 1701 1702 /* 1703 * Convert IP6 address to printable (loggable) representation. Caller 1704 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 1705 */ 1706 static char digits[] = "0123456789abcdef"; 1707 char * 1708 ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 1709 { 1710 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0; 1711 char *cp; 1712 const u_int16_t *a = (const u_int16_t *)addr; 1713 const u_int8_t *d; 1714 int dcolon = 0, zero = 0; 1715 1716 cp = ip6buf; 1717 1718 for (i = 0; i < 8; i++) { 1719 if (*(a + i) == 0) { 1720 cnt++; 1721 if (cnt == 1) 1722 idx = i; 1723 } 1724 else if (maxcnt < cnt) { 1725 maxcnt = cnt; 1726 index = idx; 1727 cnt = 0; 1728 } 1729 } 1730 if (maxcnt < cnt) { 1731 maxcnt = cnt; 1732 index = idx; 1733 } 1734 1735 for (i = 0; i < 8; i++) { 1736 if (dcolon == 1) { 1737 if (*a == 0) { 1738 if (i == 7) 1739 *cp++ = ':'; 1740 a++; 1741 continue; 1742 } else 1743 dcolon = 2; 1744 } 1745 if (*a == 0) { 1746 if (dcolon == 0 && *(a + 1) == 0 && i == index) { 1747 if (i == 0) 1748 *cp++ = ':'; 1749 *cp++ = ':'; 1750 dcolon = 1; 1751 } else { 1752 *cp++ = '0'; 1753 *cp++ = ':'; 1754 } 1755 a++; 1756 continue; 1757 } 1758 d = (const u_char *)a; 1759 /* Try to eliminate leading zeros in printout like in :0001. */ 1760 zero = 1; 1761 *cp = digits[*d >> 4]; 1762 if (*cp != '0') { 1763 zero = 0; 1764 cp++; 1765 } 1766 *cp = digits[*d++ & 0xf]; 1767 if (zero == 0 || (*cp != '0')) { 1768 zero = 0; 1769 cp++; 1770 } 1771 *cp = digits[*d >> 4]; 1772 if (zero == 0 || (*cp != '0')) { 1773 zero = 0; 1774 cp++; 1775 } 1776 *cp++ = digits[*d & 0xf]; 1777 *cp++ = ':'; 1778 a++; 1779 } 1780 *--cp = '\0'; 1781 return (ip6buf); 1782 } 1783 1784 int 1785 in6_localaddr(struct in6_addr *in6) 1786 { 1787 struct rm_priotracker in6_ifa_tracker; 1788 struct in6_ifaddr *ia; 1789 1790 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1791 return 1; 1792 1793 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1794 CK_STAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 1795 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1796 &ia->ia_prefixmask.sin6_addr)) { 1797 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1798 return 1; 1799 } 1800 } 1801 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1802 1803 return (0); 1804 } 1805 1806 /* 1807 * Return 1 if an internet address is for the local host and configured 1808 * on one of its interfaces. 1809 */ 1810 int 1811 in6_localip(struct in6_addr *in6) 1812 { 1813 struct rm_priotracker in6_ifa_tracker; 1814 struct in6_ifaddr *ia; 1815 1816 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1817 CK_LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 1818 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) { 1819 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1820 return (1); 1821 } 1822 } 1823 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1824 return (0); 1825 } 1826 1827 /* 1828 * Like in6_localip(), but FIB-aware and carp(4)-aware. 1829 */ 1830 bool 1831 in6_localip_fib(struct in6_addr *in6, uint16_t fib) 1832 { 1833 struct rm_priotracker in6_ifa_tracker; 1834 struct in6_ifaddr *ia; 1835 1836 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1837 CK_LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 1838 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr) && 1839 (ia->ia_ifa.ifa_carp == NULL || 1840 carp_master_p(&ia->ia_ifa)) && 1841 ia->ia_ifa.ifa_ifp->if_fib == fib) { 1842 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1843 return (true); 1844 } 1845 } 1846 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1847 return (false); 1848 } 1849 1850 /* 1851 * Return 1 if an internet address is configured on an interface. 1852 */ 1853 int 1854 in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr) 1855 { 1856 struct in6_addr in6; 1857 struct ifaddr *ifa; 1858 struct in6_ifaddr *ia6; 1859 1860 NET_EPOCH_ASSERT(); 1861 1862 in6 = *addr; 1863 if (in6_clearscope(&in6)) 1864 return (0); 1865 in6_setscope(&in6, ifp, NULL); 1866 1867 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1868 if (ifa->ifa_addr->sa_family != AF_INET6) 1869 continue; 1870 ia6 = (struct in6_ifaddr *)ifa; 1871 if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) 1872 return (1); 1873 } 1874 1875 return (0); 1876 } 1877 1878 int 1879 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1880 { 1881 struct rm_priotracker in6_ifa_tracker; 1882 struct in6_ifaddr *ia; 1883 1884 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1885 CK_LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) { 1886 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) { 1887 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 1888 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1889 return (1); /* true */ 1890 } 1891 break; 1892 } 1893 } 1894 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1895 1896 return (0); /* false */ 1897 } 1898 1899 /* 1900 * return length of part which dst and src are equal 1901 * hard coding... 1902 */ 1903 int 1904 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1905 { 1906 int match = 0; 1907 u_char *s = (u_char *)src, *d = (u_char *)dst; 1908 u_char *lim = s + 16, r; 1909 1910 while (s < lim) 1911 if ((r = (*d++ ^ *s++)) != 0) { 1912 while (r < 128) { 1913 match++; 1914 r <<= 1; 1915 } 1916 break; 1917 } else 1918 match += 8; 1919 return match; 1920 } 1921 1922 /* XXX: to be scope conscious */ 1923 int 1924 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1925 { 1926 int bytelen, bitlen; 1927 1928 /* sanity check */ 1929 if (0 > len || len > 128) { 1930 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1931 len); 1932 return (0); 1933 } 1934 1935 bytelen = len / 8; 1936 bitlen = len % 8; 1937 1938 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1939 return (0); 1940 if (bitlen != 0 && 1941 p1->s6_addr[bytelen] >> (8 - bitlen) != 1942 p2->s6_addr[bytelen] >> (8 - bitlen)) 1943 return (0); 1944 1945 return (1); 1946 } 1947 1948 void 1949 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1950 { 1951 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1952 int bytelen, bitlen, i; 1953 1954 /* sanity check */ 1955 if (0 > len || len > 128) { 1956 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1957 len); 1958 return; 1959 } 1960 1961 bzero(maskp, sizeof(*maskp)); 1962 bytelen = len / 8; 1963 bitlen = len % 8; 1964 for (i = 0; i < bytelen; i++) 1965 maskp->s6_addr[i] = 0xff; 1966 if (bitlen) 1967 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1968 } 1969 1970 /* 1971 * return the best address out of the same scope. if no address was 1972 * found, return the first valid address from designated IF. 1973 */ 1974 struct in6_ifaddr * 1975 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 1976 { 1977 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 1978 struct ifaddr *ifa; 1979 struct in6_ifaddr *besta = NULL; 1980 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 1981 1982 NET_EPOCH_ASSERT(); 1983 1984 dep[0] = dep[1] = NULL; 1985 1986 /* 1987 * We first look for addresses in the same scope. 1988 * If there is one, return it. 1989 * If two or more, return one which matches the dst longest. 1990 * If none, return one of global addresses assigned other ifs. 1991 */ 1992 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1993 if (ifa->ifa_addr->sa_family != AF_INET6) 1994 continue; 1995 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1996 continue; /* XXX: is there any case to allow anycast? */ 1997 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1998 continue; /* don't use this interface */ 1999 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2000 continue; 2001 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2002 if (V_ip6_use_deprecated) 2003 dep[0] = (struct in6_ifaddr *)ifa; 2004 continue; 2005 } 2006 2007 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2008 /* 2009 * call in6_matchlen() as few as possible 2010 */ 2011 if (besta) { 2012 if (blen == -1) 2013 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2014 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2015 if (tlen > blen) { 2016 blen = tlen; 2017 besta = (struct in6_ifaddr *)ifa; 2018 } 2019 } else 2020 besta = (struct in6_ifaddr *)ifa; 2021 } 2022 } 2023 if (besta) 2024 return (besta); 2025 2026 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2027 if (ifa->ifa_addr->sa_family != AF_INET6) 2028 continue; 2029 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2030 continue; /* XXX: is there any case to allow anycast? */ 2031 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2032 continue; /* don't use this interface */ 2033 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2034 continue; 2035 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2036 if (V_ip6_use_deprecated) 2037 dep[1] = (struct in6_ifaddr *)ifa; 2038 continue; 2039 } 2040 2041 return (struct in6_ifaddr *)ifa; 2042 } 2043 2044 /* use the last-resort values, that are, deprecated addresses */ 2045 if (dep[0]) 2046 return dep[0]; 2047 if (dep[1]) 2048 return dep[1]; 2049 2050 return NULL; 2051 } 2052 2053 /* 2054 * perform DAD when interface becomes IFF_UP. 2055 */ 2056 void 2057 in6_if_up(struct ifnet *ifp) 2058 { 2059 struct epoch_tracker et; 2060 struct ifaddr *ifa; 2061 struct in6_ifaddr *ia; 2062 2063 NET_EPOCH_ENTER(et); 2064 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2065 if (ifa->ifa_addr->sa_family != AF_INET6) 2066 continue; 2067 ia = (struct in6_ifaddr *)ifa; 2068 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2069 /* 2070 * The TENTATIVE flag was likely set by hand 2071 * beforehand, implicitly indicating the need for DAD. 2072 * We may be able to skip the random delay in this 2073 * case, but we impose delays just in case. 2074 */ 2075 nd6_dad_start(ifa, 2076 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 2077 } 2078 } 2079 NET_EPOCH_EXIT(et); 2080 2081 /* 2082 * special cases, like 6to4, are handled in in6_ifattach 2083 */ 2084 in6_ifattach(ifp, NULL); 2085 } 2086 2087 static void 2088 in6_ifevent(void *arg __unused, struct ifnet *ifp, int event) 2089 { 2090 if (event == IFNET_EVENT_UP) 2091 in6_if_up(ifp); 2092 } 2093 2094 static void 2095 in6_init(void *arg __unused) 2096 { 2097 EVENTHANDLER_REGISTER(ifnet_event, in6_ifevent, NULL, EVENTHANDLER_PRI_ANY); 2098 } 2099 SYSINIT(in6_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, in6_init, NULL); 2100 2101 int 2102 in6if_do_dad(struct ifnet *ifp) 2103 { 2104 2105 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 2106 return (0); 2107 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2108 return (0); 2109 if ((ND_IFINFO(ifp)->flags & 2110 (ND6_IFF_IFDISABLED | ND6_IFF_NO_DAD)) != 0) 2111 return (0); 2112 return (1); 2113 } 2114 2115 /* 2116 * Provide the length of interface identifiers to be used for the link attached 2117 * to the given interface. The length should be defined in "IPv6 over 2118 * xxx-link" document. Note that address architecture might also define 2119 * the length for a particular set of address prefixes, regardless of the 2120 * link type. As clarified in rfc2462bis, those two definitions should be 2121 * consistent, and those really are as of August 2004. 2122 */ 2123 int 2124 in6_if2idlen(struct ifnet *ifp) 2125 { 2126 switch (ifp->if_type) { 2127 case IFT_ETHER: /* RFC2464 */ 2128 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2129 case IFT_L2VLAN: /* ditto */ 2130 case IFT_BRIDGE: /* bridge(4) only does Ethernet-like links */ 2131 case IFT_INFINIBAND: 2132 return (64); 2133 case IFT_PPP: /* RFC2472 */ 2134 return (64); 2135 case IFT_FRELAY: /* RFC2590 */ 2136 return (64); 2137 case IFT_IEEE1394: /* RFC3146 */ 2138 return (64); 2139 case IFT_GIF: 2140 return (64); /* draft-ietf-v6ops-mech-v2-07 */ 2141 case IFT_LOOP: 2142 return (64); /* XXX: is this really correct? */ 2143 default: 2144 /* 2145 * Unknown link type: 2146 * It might be controversial to use the today's common constant 2147 * of 64 for these cases unconditionally. For full compliance, 2148 * we should return an error in this case. On the other hand, 2149 * if we simply miss the standard for the link type or a new 2150 * standard is defined for a new link type, the IFID length 2151 * is very likely to be the common constant. As a compromise, 2152 * we always use the constant, but make an explicit notice 2153 * indicating the "unknown" case. 2154 */ 2155 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2156 return (64); 2157 } 2158 } 2159 2160 struct in6_llentry { 2161 struct llentry base; 2162 }; 2163 2164 #define IN6_LLTBL_DEFAULT_HSIZE 32 2165 #define IN6_LLTBL_HASH(k, h) \ 2166 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 2167 2168 /* 2169 * Do actual deallocation of @lle. 2170 */ 2171 static void 2172 in6_lltable_destroy_lle_unlocked(epoch_context_t ctx) 2173 { 2174 struct llentry *lle; 2175 2176 lle = __containerof(ctx, struct llentry, lle_epoch_ctx); 2177 LLE_LOCK_DESTROY(lle); 2178 LLE_REQ_DESTROY(lle); 2179 free(lle, M_LLTABLE); 2180 } 2181 2182 /* 2183 * Called by LLE_FREE_LOCKED when number of references 2184 * drops to zero. 2185 */ 2186 static void 2187 in6_lltable_destroy_lle(struct llentry *lle) 2188 { 2189 2190 LLE_WUNLOCK(lle); 2191 NET_EPOCH_CALL(in6_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx); 2192 } 2193 2194 static struct llentry * 2195 in6_lltable_new(const struct in6_addr *addr6, u_int flags) 2196 { 2197 struct in6_llentry *lle; 2198 2199 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 2200 if (lle == NULL) /* NB: caller generates msg */ 2201 return NULL; 2202 2203 lle->base.r_l3addr.addr6 = *addr6; 2204 lle->base.lle_refcnt = 1; 2205 lle->base.lle_free = in6_lltable_destroy_lle; 2206 LLE_LOCK_INIT(&lle->base); 2207 LLE_REQ_INIT(&lle->base); 2208 callout_init(&lle->base.lle_timer, 1); 2209 2210 return (&lle->base); 2211 } 2212 2213 static int 2214 in6_lltable_match_prefix(const struct sockaddr *saddr, 2215 const struct sockaddr *smask, u_int flags, struct llentry *lle) 2216 { 2217 const struct in6_addr *addr, *mask, *lle_addr; 2218 2219 addr = &((const struct sockaddr_in6 *)saddr)->sin6_addr; 2220 mask = &((const struct sockaddr_in6 *)smask)->sin6_addr; 2221 lle_addr = &lle->r_l3addr.addr6; 2222 2223 if (IN6_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0) 2224 return (0); 2225 2226 if (lle->la_flags & LLE_IFADDR) { 2227 /* 2228 * Delete LLE_IFADDR records IFF address & flag matches. 2229 * Note that addr is the interface address within prefix 2230 * being matched. 2231 */ 2232 if (IN6_ARE_ADDR_EQUAL(addr, lle_addr) && 2233 (flags & LLE_STATIC) != 0) 2234 return (1); 2235 return (0); 2236 } 2237 2238 /* flags & LLE_STATIC means deleting both dynamic and static entries */ 2239 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC)) 2240 return (1); 2241 2242 return (0); 2243 } 2244 2245 static void 2246 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle) 2247 { 2248 struct ifnet *ifp __diagused; 2249 2250 LLE_WLOCK_ASSERT(lle); 2251 KASSERT(llt != NULL, ("lltable is NULL")); 2252 2253 /* Unlink entry from table */ 2254 if ((lle->la_flags & LLE_LINKED) != 0) { 2255 ifp = llt->llt_ifp; 2256 IF_AFDATA_WLOCK_ASSERT(ifp); 2257 lltable_unlink_entry(llt, lle); 2258 } 2259 2260 llentry_free(lle); 2261 } 2262 2263 static int 2264 in6_lltable_rtcheck(struct ifnet *ifp, 2265 u_int flags, 2266 const struct sockaddr *l3addr) 2267 { 2268 const struct sockaddr_in6 *sin6; 2269 struct nhop_object *nh; 2270 struct in6_addr dst; 2271 uint32_t scopeid; 2272 char ip6buf[INET6_ADDRSTRLEN]; 2273 int fibnum; 2274 2275 NET_EPOCH_ASSERT(); 2276 KASSERT(l3addr->sa_family == AF_INET6, 2277 ("sin_family %d", l3addr->sa_family)); 2278 2279 sin6 = (const struct sockaddr_in6 *)l3addr; 2280 in6_splitscope(&sin6->sin6_addr, &dst, &scopeid); 2281 fibnum = V_rt_add_addr_allfibs ? RT_DEFAULT_FIB : ifp->if_fib; 2282 nh = fib6_lookup(fibnum, &dst, scopeid, NHR_NONE, 0); 2283 if (nh && ((nh->nh_flags & NHF_GATEWAY) || nh->nh_ifp != ifp)) { 2284 struct ifaddr *ifa; 2285 /* 2286 * Create an ND6 cache for an IPv6 neighbor 2287 * that is not covered by our own prefix. 2288 */ 2289 ifa = ifaof_ifpforaddr(l3addr, ifp); 2290 if (ifa != NULL) { 2291 return 0; 2292 } 2293 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2294 ip6_sprintf(ip6buf, &sin6->sin6_addr)); 2295 return EINVAL; 2296 } 2297 return 0; 2298 } 2299 2300 static inline uint32_t 2301 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize) 2302 { 2303 2304 return (IN6_LLTBL_HASH(dst->s6_addr32[3], hsize)); 2305 } 2306 2307 static uint32_t 2308 in6_lltable_hash(const struct llentry *lle, uint32_t hsize) 2309 { 2310 2311 return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize)); 2312 } 2313 2314 static void 2315 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 2316 { 2317 struct sockaddr_in6 *sin6; 2318 2319 sin6 = (struct sockaddr_in6 *)sa; 2320 bzero(sin6, sizeof(*sin6)); 2321 sin6->sin6_family = AF_INET6; 2322 sin6->sin6_len = sizeof(*sin6); 2323 sin6->sin6_addr = lle->r_l3addr.addr6; 2324 } 2325 2326 static inline struct llentry * 2327 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst) 2328 { 2329 struct llentry *lle; 2330 struct llentries *lleh; 2331 u_int hashidx; 2332 2333 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize); 2334 lleh = &llt->lle_head[hashidx]; 2335 CK_LIST_FOREACH(lle, lleh, lle_next) { 2336 if (lle->la_flags & LLE_DELETED) 2337 continue; 2338 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst)) 2339 break; 2340 } 2341 2342 return (lle); 2343 } 2344 2345 static void 2346 in6_lltable_delete_entry(struct lltable *llt, struct llentry *lle) 2347 { 2348 2349 lle->la_flags |= LLE_DELETED; 2350 2351 /* Leave the solicited multicast group. */ 2352 if ((lle->la_flags & LLE_PUB) != 0) 2353 in6_leave_proxy_ndp_mc(llt->llt_ifp, &lle->r_l3addr.addr6); 2354 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 2355 #ifdef DIAGNOSTIC 2356 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2357 #endif 2358 llentry_free(lle); 2359 } 2360 2361 static struct llentry * 2362 in6_lltable_alloc(struct lltable *llt, u_int flags, 2363 const struct sockaddr *l3addr) 2364 { 2365 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2366 struct ifnet *ifp = llt->llt_ifp; 2367 struct llentry *lle; 2368 char linkhdr[LLE_MAX_LINKHDR]; 2369 size_t linkhdrsize; 2370 int lladdr_off; 2371 2372 KASSERT(l3addr->sa_family == AF_INET6, 2373 ("sin_family %d", l3addr->sa_family)); 2374 2375 /* 2376 * A route that covers the given address must have 2377 * been installed 1st because we are doing a resolution, 2378 * verify this. 2379 */ 2380 if (!(flags & LLE_IFADDR) && 2381 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2382 return (NULL); 2383 2384 lle = in6_lltable_new(&sin6->sin6_addr, flags); 2385 if (lle == NULL) { 2386 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2387 return (NULL); 2388 } 2389 lle->la_flags = flags; 2390 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 2391 linkhdrsize = LLE_MAX_LINKHDR; 2392 if (lltable_calc_llheader(ifp, AF_INET6, IF_LLADDR(ifp), 2393 linkhdr, &linkhdrsize, &lladdr_off) != 0) { 2394 in6_lltable_free_entry(llt, lle); 2395 return (NULL); 2396 } 2397 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize, 2398 lladdr_off); 2399 lle->la_flags |= LLE_STATIC; 2400 } 2401 2402 if ((lle->la_flags & LLE_STATIC) != 0) 2403 lle->ln_state = ND6_LLINFO_REACHABLE; 2404 2405 return (lle); 2406 } 2407 2408 static struct llentry * 2409 in6_lltable_lookup(struct lltable *llt, u_int flags, 2410 const struct sockaddr *l3addr) 2411 { 2412 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2413 int family = flags >> 16; 2414 struct llentry *lle; 2415 2416 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 2417 KASSERT(l3addr->sa_family == AF_INET6, 2418 ("sin_family %d", l3addr->sa_family)); 2419 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) != 2420 (LLE_UNLOCKED | LLE_EXCLUSIVE), 2421 ("wrong lle request flags: %#x", flags)); 2422 2423 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2424 2425 if (__predict_false(family != AF_INET6)) 2426 lle = llentry_lookup_family(lle, family); 2427 2428 if (lle == NULL) 2429 return (NULL); 2430 2431 if (flags & LLE_UNLOCKED) 2432 return (lle); 2433 2434 if (flags & LLE_EXCLUSIVE) 2435 LLE_WLOCK(lle); 2436 else 2437 LLE_RLOCK(lle); 2438 2439 /* 2440 * If the afdata lock is not held, the LLE may have been unlinked while 2441 * we were blocked on the LLE lock. Check for this case. 2442 */ 2443 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) { 2444 if (flags & LLE_EXCLUSIVE) 2445 LLE_WUNLOCK(lle); 2446 else 2447 LLE_RUNLOCK(lle); 2448 return (NULL); 2449 } 2450 return (lle); 2451 } 2452 2453 static int 2454 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 2455 struct sysctl_req *wr) 2456 { 2457 struct ifnet *ifp = llt->llt_ifp; 2458 /* XXX stack use */ 2459 struct { 2460 struct rt_msghdr rtm; 2461 struct sockaddr_in6 sin6; 2462 /* 2463 * ndp.c assumes that sdl is word aligned 2464 */ 2465 #ifdef __LP64__ 2466 uint32_t pad; 2467 #endif 2468 struct sockaddr_dl sdl; 2469 } ndpc; 2470 struct sockaddr_dl *sdl; 2471 int error; 2472 2473 bzero(&ndpc, sizeof(ndpc)); 2474 /* skip deleted entries */ 2475 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 2476 return (0); 2477 /* Skip if jailed and not a valid IP of the prison. */ 2478 lltable_fill_sa_entry(lle, (struct sockaddr *)&ndpc.sin6); 2479 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&ndpc.sin6) != 0) 2480 return (0); 2481 /* 2482 * produce a msg made of: 2483 * struct rt_msghdr; 2484 * struct sockaddr_in6 (IPv6) 2485 * struct sockaddr_dl; 2486 */ 2487 ndpc.rtm.rtm_msglen = sizeof(ndpc); 2488 ndpc.rtm.rtm_version = RTM_VERSION; 2489 ndpc.rtm.rtm_type = RTM_GET; 2490 ndpc.rtm.rtm_flags = RTF_UP; 2491 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 2492 sa6_recoverscope(&ndpc.sin6); 2493 2494 /* publish */ 2495 if (lle->la_flags & LLE_PUB) 2496 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE; 2497 2498 sdl = &ndpc.sdl; 2499 sdl->sdl_family = AF_LINK; 2500 sdl->sdl_len = sizeof(*sdl); 2501 sdl->sdl_index = ifp->if_index; 2502 sdl->sdl_type = ifp->if_type; 2503 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 2504 sdl->sdl_alen = ifp->if_addrlen; 2505 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 2506 } else { 2507 sdl->sdl_alen = 0; 2508 bzero(LLADDR(sdl), ifp->if_addrlen); 2509 } 2510 if (lle->la_expire != 0) 2511 ndpc.rtm.rtm_rmx.rmx_expire = lle->la_expire + 2512 lle->lle_remtime / hz + time_second - time_uptime; 2513 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 2514 if (lle->la_flags & LLE_STATIC) 2515 ndpc.rtm.rtm_flags |= RTF_STATIC; 2516 if (lle->la_flags & LLE_IFADDR) 2517 ndpc.rtm.rtm_flags |= RTF_PINNED; 2518 if (lle->ln_router != 0) 2519 ndpc.rtm.rtm_flags |= RTF_GATEWAY; 2520 ndpc.rtm.rtm_rmx.rmx_pksent = lle->la_asked; 2521 /* Store state in rmx_weight value */ 2522 ndpc.rtm.rtm_rmx.rmx_state = lle->ln_state; 2523 ndpc.rtm.rtm_index = ifp->if_index; 2524 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc)); 2525 2526 return (error); 2527 } 2528 2529 static void 2530 in6_lltable_post_resolved(struct lltable *llt, struct llentry *lle) 2531 { 2532 /* Join the solicited multicast group for dst. */ 2533 if ((lle->la_flags & LLE_PUB) == LLE_PUB) 2534 in6_join_proxy_ndp_mc(llt->llt_ifp, &lle->r_l3addr.addr6); 2535 } 2536 2537 static struct lltable * 2538 in6_lltattach(struct ifnet *ifp) 2539 { 2540 struct lltable *llt; 2541 2542 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE); 2543 llt->llt_af = AF_INET6; 2544 llt->llt_ifp = ifp; 2545 2546 llt->llt_lookup = in6_lltable_lookup; 2547 llt->llt_alloc_entry = in6_lltable_alloc; 2548 llt->llt_delete_entry = in6_lltable_delete_entry; 2549 llt->llt_dump_entry = in6_lltable_dump_entry; 2550 llt->llt_hash = in6_lltable_hash; 2551 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry; 2552 llt->llt_free_entry = in6_lltable_free_entry; 2553 llt->llt_match_prefix = in6_lltable_match_prefix; 2554 llt->llt_mark_used = llentry_mark_used; 2555 llt->llt_post_resolved = in6_lltable_post_resolved; 2556 lltable_link(llt); 2557 2558 return (llt); 2559 } 2560 2561 struct lltable * 2562 in6_lltable_get(struct ifnet *ifp) 2563 { 2564 struct lltable *llt = NULL; 2565 2566 void *afdata_ptr = ifp->if_afdata[AF_INET6]; 2567 if (afdata_ptr != NULL) 2568 llt = ((struct in6_ifextra *)afdata_ptr)->lltable; 2569 return (llt); 2570 } 2571 2572 void * 2573 in6_domifattach(struct ifnet *ifp) 2574 { 2575 struct in6_ifextra *ext; 2576 2577 /* There are not IPv6-capable interfaces. */ 2578 switch (ifp->if_type) { 2579 case IFT_PFLOG: 2580 case IFT_PFSYNC: 2581 case IFT_USB: 2582 return (NULL); 2583 } 2584 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2585 bzero(ext, sizeof(*ext)); 2586 2587 ext->in6_ifstat = malloc(sizeof(counter_u64_t) * 2588 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK); 2589 COUNTER_ARRAY_ALLOC(ext->in6_ifstat, 2590 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK); 2591 2592 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) * 2593 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR, 2594 M_WAITOK); 2595 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat, 2596 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK); 2597 2598 ext->nd_ifinfo = nd6_ifattach(ifp); 2599 ext->scope6_id = scope6_ifattach(ifp); 2600 ext->lltable = in6_lltattach(ifp); 2601 2602 ext->mld_ifinfo = mld_domifattach(ifp); 2603 2604 return ext; 2605 } 2606 2607 int 2608 in6_domifmtu(struct ifnet *ifp) 2609 { 2610 if (ifp->if_afdata[AF_INET6] == NULL) 2611 return ifp->if_mtu; 2612 2613 return (IN6_LINKMTU(ifp)); 2614 } 2615 2616 void 2617 in6_domifdetach(struct ifnet *ifp, void *aux) 2618 { 2619 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2620 2621 mld_domifdetach(ifp); 2622 scope6_ifdetach(ext->scope6_id); 2623 nd6_ifdetach(ifp, ext->nd_ifinfo); 2624 lltable_free(ext->lltable); 2625 COUNTER_ARRAY_FREE(ext->in6_ifstat, 2626 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 2627 free(ext->in6_ifstat, M_IFADDR); 2628 COUNTER_ARRAY_FREE(ext->icmp6_ifstat, 2629 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 2630 free(ext->icmp6_ifstat, M_IFADDR); 2631 free(ext, M_IFADDR); 2632 } 2633 2634 /* 2635 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2636 * v4 mapped addr or v4 compat addr 2637 */ 2638 void 2639 in6_sin6_2_sin(struct sockaddr_in *sin, const struct sockaddr_in6 *sin6) 2640 { 2641 2642 bzero(sin, sizeof(*sin)); 2643 sin->sin_len = sizeof(struct sockaddr_in); 2644 sin->sin_family = AF_INET; 2645 sin->sin_port = sin6->sin6_port; 2646 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2647 } 2648 2649 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2650 void 2651 in6_sin_2_v4mapsin6(const struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2652 { 2653 bzero(sin6, sizeof(*sin6)); 2654 sin6->sin6_len = sizeof(struct sockaddr_in6); 2655 sin6->sin6_family = AF_INET6; 2656 sin6->sin6_port = sin->sin_port; 2657 sin6->sin6_addr.s6_addr32[0] = 0; 2658 sin6->sin6_addr.s6_addr32[1] = 0; 2659 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2660 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2661 } 2662 2663 /* Convert sockaddr_in6 into sockaddr_in. */ 2664 void 2665 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2666 { 2667 struct sockaddr_in *sin_p; 2668 struct sockaddr_in6 sin6; 2669 2670 /* 2671 * Save original sockaddr_in6 addr and convert it 2672 * to sockaddr_in. 2673 */ 2674 sin6 = *(struct sockaddr_in6 *)nam; 2675 sin_p = (struct sockaddr_in *)nam; 2676 in6_sin6_2_sin(sin_p, &sin6); 2677 } 2678 2679 /* 2680 * Join/leave the solicited multicast groups for proxy NDP entries. 2681 */ 2682 static void 2683 in6_join_proxy_ndp_mc(struct ifnet *ifp, const struct in6_addr *dst) 2684 { 2685 struct in6_multi *inm; 2686 struct in6_addr mltaddr; 2687 char ip6buf[INET6_ADDRSTRLEN]; 2688 int error; 2689 2690 if (in6_solicited_node_maddr(&mltaddr, ifp, dst) != 0) 2691 return; /* error logged in in6_solicited_node_maddr. */ 2692 2693 error = in6_joingroup(ifp, &mltaddr, NULL, &inm, 0); 2694 if (error != 0) { 2695 nd6log((LOG_WARNING, 2696 "%s: in6_joingroup failed for %s on %s (errno=%d)\n", 2697 __func__, ip6_sprintf(ip6buf, &mltaddr), if_name(ifp), 2698 error)); 2699 } 2700 } 2701 2702 static void 2703 in6_leave_proxy_ndp_mc(struct ifnet *ifp, const struct in6_addr *dst) 2704 { 2705 struct epoch_tracker et; 2706 struct in6_multi *inm; 2707 struct in6_addr mltaddr; 2708 char ip6buf[INET6_ADDRSTRLEN]; 2709 2710 if (in6_solicited_node_maddr(&mltaddr, ifp, dst) != 0) 2711 return; /* error logged in in6_solicited_node_maddr. */ 2712 2713 NET_EPOCH_ENTER(et); 2714 inm = in6m_lookup(ifp, &mltaddr); 2715 NET_EPOCH_EXIT(et); 2716 if (inm != NULL) 2717 in6_leavegroup(inm, NULL); 2718 else 2719 nd6log((LOG_WARNING, "%s: in6m_lookup failed for %s on %s\n", 2720 __func__, ip6_sprintf(ip6buf, &mltaddr), if_name(ifp))); 2721 } 2722 2723 static bool 2724 in6_lle_match_pub(struct lltable *llt, struct llentry *lle, void *farg) 2725 { 2726 return ((lle->la_flags & LLE_PUB) != 0); 2727 } 2728 2729 void 2730 in6_purge_proxy_ndp(struct ifnet *ifp) 2731 { 2732 struct lltable *llt; 2733 bool need_purge; 2734 2735 if (ifp->if_afdata[AF_INET6] == NULL) 2736 return; 2737 2738 llt = LLTABLE6(ifp); 2739 IF_AFDATA_WLOCK(ifp); 2740 need_purge = ((llt->llt_flags & LLT_ADDEDPROXY) != 0); 2741 IF_AFDATA_WUNLOCK(ifp); 2742 2743 /* 2744 * Ever added proxy ndp entries, leave solicited node multicast 2745 * before deleting the llentry. 2746 */ 2747 if (need_purge) 2748 lltable_delete_conditional(llt, in6_lle_match_pub, NULL); 2749 } 2750