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/route.h> 90 #include <net/route/route_ctl.h> 91 #include <net/route/nhop.h> 92 #include <net/if_dl.h> 93 #include <net/vnet.h> 94 95 #include <netinet/in.h> 96 #include <netinet/in_var.h> 97 #include <net/if_llatbl.h> 98 #include <netinet/if_ether.h> 99 #include <netinet/in_systm.h> 100 #include <netinet/ip.h> 101 #include <netinet/in_pcb.h> 102 #include <netinet/ip_carp.h> 103 #include <netinet/icmp6.h> 104 105 #include <netinet/ip6.h> 106 #include <netinet6/ip6_var.h> 107 #include <netinet6/nd6.h> 108 #include <netinet6/mld6_var.h> 109 #include <netinet6/ip6_mroute.h> 110 #include <netinet6/in6_ifattach.h> 111 #include <netinet6/scope6_var.h> 112 #include <netinet6/in6_fib.h> 113 #include <netinet6/in6_pcb.h> 114 115 #ifdef MAC 116 #include <security/mac/mac_framework.h> 117 #endif 118 119 /* 120 * struct in6_ifreq and struct ifreq must be type punnable for common members 121 * of ifr_ifru to allow accessors to be shared. 122 */ 123 _Static_assert(offsetof(struct in6_ifreq, ifr_ifru) == 124 offsetof(struct ifreq, ifr_ifru), 125 "struct in6_ifreq and struct ifreq are not type punnable"); 126 127 VNET_DEFINE_STATIC(int, icmp6_nodeinfo_oldmcprefix) = 1; 128 #define V_icmp6_nodeinfo_oldmcprefix VNET(icmp6_nodeinfo_oldmcprefix) 129 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO_OLDMCPREFIX, 130 nodeinfo_oldmcprefix, CTLFLAG_VNET | CTLFLAG_RW, 131 &VNET_NAME(icmp6_nodeinfo_oldmcprefix), 0, 132 "Join old IPv6 NI group address in draft-ietf-ipngwg-icmp-name-lookup " 133 "for compatibility with KAME implementation"); 134 135 VNET_DEFINE_STATIC(int, nd6_useloopback) = 1; 136 #define V_nd6_useloopback VNET(nd6_useloopback) 137 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_USELOOPBACK, nd6_useloopback, 138 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_useloopback), 0, 139 "Create a loopback route when configuring an IPv6 address"); 140 141 /* 142 * Definitions of some costant IP6 addresses. 143 */ 144 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 145 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 146 const struct in6_addr in6addr_nodelocal_allnodes = 147 IN6ADDR_NODELOCAL_ALLNODES_INIT; 148 const struct in6_addr in6addr_linklocal_allnodes = 149 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 150 const struct in6_addr in6addr_linklocal_allrouters = 151 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 152 const struct in6_addr in6addr_linklocal_allv2routers = 153 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT; 154 155 const struct in6_addr in6mask0 = IN6MASK0; 156 const struct in6_addr in6mask32 = IN6MASK32; 157 const struct in6_addr in6mask64 = IN6MASK64; 158 const struct in6_addr in6mask96 = IN6MASK96; 159 const struct in6_addr in6mask128 = IN6MASK128; 160 161 const struct sockaddr_in6 sa6_any = 162 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 }; 163 164 static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *, 165 struct in6_aliasreq *, int); 166 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 167 168 static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *, 169 struct in6_ifaddr *, int); 170 static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *, 171 struct in6_aliasreq *, int flags); 172 static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *, 173 struct in6_ifaddr *, int, int); 174 static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *, 175 struct in6_ifaddr *, int); 176 177 static void in6_join_proxy_ndp_mc(struct ifnet *, const struct in6_addr *); 178 static void in6_leave_proxy_ndp_mc(struct ifnet *, const struct in6_addr *); 179 180 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 181 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 182 183 static struct sx in6_control_sx; 184 SX_SYSINIT(in6_control_sx, &in6_control_sx, "in6_control"); 185 186 void 187 in6_newaddrmsg(struct in6_ifaddr *ia, int cmd) 188 { 189 struct rt_addrinfo info; 190 struct ifaddr *ifa; 191 struct sockaddr_dl gateway; 192 int fibnum; 193 194 ifa = &ia->ia_ifa; 195 196 /* 197 * Prepare info data for the host route. 198 * This code mimics one from ifa_maintain_loopback_route(). 199 */ 200 bzero(&info, sizeof(struct rt_addrinfo)); 201 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED; 202 info.rti_info[RTAX_DST] = ifa->ifa_addr; 203 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&gateway; 204 link_init_sdl(ifa->ifa_ifp, (struct sockaddr *)&gateway, ifa->ifa_ifp->if_type); 205 if (cmd != RTM_DELETE) 206 info.rti_ifp = V_loif; 207 208 fibnum = ia62ifa(ia)->ifa_ifp->if_fib; 209 210 if (cmd == RTM_ADD) { 211 rt_addrmsg(cmd, &ia->ia_ifa, fibnum); 212 rt_routemsg_info(cmd, &info, fibnum); 213 } else if (cmd == RTM_DELETE) { 214 rt_routemsg_info(cmd, &info, fibnum); 215 rt_addrmsg(cmd, &ia->ia_ifa, fibnum); 216 } 217 } 218 219 int 220 in6_mask2len(struct in6_addr *mask, u_char *lim0) 221 { 222 int x = 0, y; 223 u_char *lim = lim0, *p; 224 225 /* ignore the scope_id part */ 226 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 227 lim = (u_char *)mask + sizeof(*mask); 228 for (p = (u_char *)mask; p < lim; x++, p++) { 229 if (*p != 0xff) 230 break; 231 } 232 y = 0; 233 if (p < lim) { 234 for (y = 0; y < 8; y++) { 235 if ((*p & (0x80 >> y)) == 0) 236 break; 237 } 238 } 239 240 /* 241 * when the limit pointer is given, do a stricter check on the 242 * remaining bits. 243 */ 244 if (p < lim) { 245 if (y != 0 && (*p & (0x00ff >> y)) != 0) 246 return (-1); 247 for (p = p + 1; p < lim; p++) 248 if (*p != 0) 249 return (-1); 250 } 251 252 return x * 8 + y; 253 } 254 255 #ifdef COMPAT_FREEBSD32 256 struct in6_ndifreq32 { 257 char ifname[IFNAMSIZ]; 258 uint32_t ifindex; 259 }; 260 #define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32) 261 #endif 262 263 int 264 in6_control_ioctl(u_long cmd, void *data, 265 struct ifnet *ifp, struct ucred *cred) 266 { 267 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 268 struct in6_ifaddr *ia = NULL; 269 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 270 struct sockaddr_in6 *sa6; 271 int error; 272 bool control_locked = false; 273 274 /* 275 * Compat to make pre-10.x ifconfig(8) operable. 276 */ 277 if (cmd == OSIOCAIFADDR_IN6) { 278 cmd = SIOCAIFADDR_IN6; 279 ifra->ifra_vhid = 0; 280 } 281 282 switch (cmd) { 283 case SIOCGETSGCNT_IN6: 284 case SIOCGETMIFCNT_IN6: 285 /* 286 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c. 287 * We cannot see how that would be needed, so do not adjust the 288 * KPI blindly; more likely should clean up the IPv4 variant. 289 */ 290 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP); 291 } 292 293 switch (cmd) { 294 case SIOCAADDRCTL_POLICY: 295 case SIOCDADDRCTL_POLICY: 296 if (cred != NULL) { 297 error = priv_check_cred(cred, PRIV_NETINET_ADDRCTRL6); 298 if (error) 299 return (error); 300 } 301 return (in6_src_ioctl(cmd, data)); 302 } 303 304 if (ifp == NULL) 305 return (EOPNOTSUPP); 306 307 switch (cmd) { 308 case SIOCSNDFLUSH_IN6: 309 case SIOCSPFXFLUSH_IN6: 310 case SIOCSRTRFLUSH_IN6: 311 case SIOCSDEFIFACE_IN6: 312 case SIOCSIFINFO_FLAGS: 313 case SIOCSIFINFO_IN6: 314 if (cred != NULL) { 315 error = priv_check_cred(cred, PRIV_NETINET_ND6); 316 if (error) 317 return (error); 318 } 319 /* FALLTHROUGH */ 320 case OSIOCGIFINFO_IN6: 321 case SIOCGIFINFO_IN6: 322 case SIOCGNBRINFO_IN6: 323 case SIOCGDEFIFACE_IN6: 324 return (nd6_ioctl(cmd, data, ifp)); 325 326 #ifdef COMPAT_FREEBSD32 327 case SIOCGDEFIFACE32_IN6: 328 { 329 struct in6_ndifreq ndif; 330 struct in6_ndifreq32 *ndif32; 331 332 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif, 333 ifp); 334 if (error) 335 return (error); 336 ndif32 = (struct in6_ndifreq32 *)data; 337 ndif32->ifindex = ndif.ifindex; 338 return (0); 339 } 340 #endif 341 } 342 343 switch (cmd) { 344 case SIOCSIFPREFIX_IN6: 345 case SIOCDIFPREFIX_IN6: 346 case SIOCAIFPREFIX_IN6: 347 case SIOCCIFPREFIX_IN6: 348 case SIOCSGIFPREFIX_IN6: 349 case SIOCGIFPREFIX_IN6: 350 log(LOG_NOTICE, 351 "prefix ioctls are now invalidated. " 352 "please use ifconfig.\n"); 353 return (EOPNOTSUPP); 354 } 355 356 switch (cmd) { 357 case SIOCSSCOPE6: 358 if (cred != NULL) { 359 error = priv_check_cred(cred, PRIV_NETINET_SCOPE6); 360 if (error) 361 return (error); 362 } 363 /* FALLTHROUGH */ 364 case SIOCGSCOPE6: 365 case SIOCGSCOPE6DEF: 366 return (scope6_ioctl(cmd, data, ifp)); 367 } 368 369 /* 370 * Find address for this interface, if it exists. 371 * 372 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 373 * only, and used the first interface address as the target of other 374 * operations (without checking ifra_addr). This was because netinet 375 * code/API assumed at most 1 interface address per interface. 376 * Since IPv6 allows a node to assign multiple addresses 377 * on a single interface, we almost always look and check the 378 * presence of ifra_addr, and reject invalid ones here. 379 * It also decreases duplicated code among SIOC*_IN6 operations. 380 */ 381 switch (cmd) { 382 case SIOCAIFADDR_IN6: 383 case SIOCSIFPHYADDR_IN6: 384 sa6 = &ifra->ifra_addr; 385 break; 386 case SIOCSIFADDR_IN6: 387 case SIOCGIFADDR_IN6: 388 case SIOCSIFDSTADDR_IN6: 389 case SIOCSIFNETMASK_IN6: 390 case SIOCGIFDSTADDR_IN6: 391 case SIOCGIFNETMASK_IN6: 392 case SIOCDIFADDR_IN6: 393 case SIOCGIFPSRCADDR_IN6: 394 case SIOCGIFPDSTADDR_IN6: 395 case SIOCGIFAFLAG_IN6: 396 case SIOCSNDFLUSH_IN6: 397 case SIOCSPFXFLUSH_IN6: 398 case SIOCSRTRFLUSH_IN6: 399 case SIOCGIFALIFETIME_IN6: 400 case SIOCGIFSTAT_IN6: 401 case SIOCGIFSTAT_ICMP6: 402 sa6 = &ifr->ifr_addr; 403 break; 404 case SIOCSIFADDR: 405 case SIOCSIFBRDADDR: 406 case SIOCSIFDSTADDR: 407 case SIOCSIFNETMASK: 408 /* 409 * Although we should pass any non-INET6 ioctl requests 410 * down to driver, we filter some legacy INET requests. 411 * Drivers trust SIOCSIFADDR et al to come from an already 412 * privileged layer, and do not perform any credentials 413 * checks or input validation. 414 */ 415 return (EINVAL); 416 default: 417 sa6 = NULL; 418 break; 419 } 420 if (sa6 && sa6->sin6_family == AF_INET6) { 421 if (sa6->sin6_scope_id != 0) 422 error = sa6_embedscope(sa6, 0); 423 else 424 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 425 if (error != 0) 426 return (error); 427 if (cred != NULL && (error = prison_check_ip6(cred, 428 &sa6->sin6_addr)) != 0) 429 return (error); 430 sx_xlock(&in6_control_sx); 431 control_locked = true; 432 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 433 } else 434 ia = NULL; 435 436 switch (cmd) { 437 case SIOCSIFADDR_IN6: 438 case SIOCSIFDSTADDR_IN6: 439 case SIOCSIFNETMASK_IN6: 440 /* 441 * Since IPv6 allows a node to assign multiple addresses 442 * on a single interface, SIOCSIFxxx ioctls are deprecated. 443 */ 444 /* we decided to obsolete this command (20000704) */ 445 error = EINVAL; 446 goto out; 447 448 case SIOCDIFADDR_IN6: 449 /* 450 * for IPv4, we look for existing in_ifaddr here to allow 451 * "ifconfig if0 delete" to remove the first IPv4 address on 452 * the interface. For IPv6, as the spec allows multiple 453 * interface address from the day one, we consider "remove the 454 * first one" semantics to be not preferable. 455 */ 456 if (ia == NULL) { 457 error = EADDRNOTAVAIL; 458 goto out; 459 } 460 /* FALLTHROUGH */ 461 case SIOCAIFADDR_IN6: 462 /* 463 * We always require users to specify a valid IPv6 address for 464 * the corresponding operation. 465 */ 466 if (ifra->ifra_addr.sin6_family != AF_INET6 || 467 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 468 error = EAFNOSUPPORT; 469 goto out; 470 } 471 472 if (cred != NULL) { 473 error = priv_check_cred(cred, (cmd == SIOCDIFADDR_IN6) ? 474 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR); 475 if (error) 476 goto out; 477 } 478 /* FALLTHROUGH */ 479 case SIOCGIFSTAT_IN6: 480 case SIOCGIFSTAT_ICMP6: 481 if (ifp->if_afdata[AF_INET6] == NULL) { 482 error = EPFNOSUPPORT; 483 goto out; 484 } 485 break; 486 487 case SIOCGIFADDR_IN6: 488 /* This interface is basically deprecated. use SIOCGIFCONF. */ 489 /* FALLTHROUGH */ 490 case SIOCGIFAFLAG_IN6: 491 case SIOCGIFNETMASK_IN6: 492 case SIOCGIFDSTADDR_IN6: 493 case SIOCGIFALIFETIME_IN6: 494 /* must think again about its semantics */ 495 if (ia == NULL) { 496 error = EADDRNOTAVAIL; 497 goto out; 498 } 499 break; 500 } 501 502 switch (cmd) { 503 case SIOCGIFADDR_IN6: 504 ifr->ifr_addr = ia->ia_addr; 505 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 506 goto out; 507 break; 508 509 case SIOCGIFDSTADDR_IN6: 510 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 511 error = EINVAL; 512 goto out; 513 } 514 ifr->ifr_dstaddr = ia->ia_dstaddr; 515 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 516 goto out; 517 break; 518 519 case SIOCGIFNETMASK_IN6: 520 ifr->ifr_addr = ia->ia_prefixmask; 521 break; 522 523 case SIOCGIFAFLAG_IN6: 524 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 525 break; 526 527 case SIOCGIFSTAT_IN6: 528 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 529 ifp->if_afdata[AF_INET6])->in6_ifstat, 530 &ifr->ifr_ifru.ifru_stat, 531 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 532 break; 533 534 case SIOCGIFSTAT_ICMP6: 535 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 536 ifp->if_afdata[AF_INET6])->icmp6_ifstat, 537 &ifr->ifr_ifru.ifru_icmp6stat, 538 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 539 break; 540 541 case SIOCGIFALIFETIME_IN6: 542 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 543 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 544 time_t maxexpire; 545 struct in6_addrlifetime *retlt = 546 &ifr->ifr_ifru.ifru_lifetime; 547 548 /* 549 * XXX: adjust expiration time assuming time_t is 550 * signed. 551 */ 552 maxexpire = (-1) & 553 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 554 if (ia->ia6_lifetime.ia6t_vltime < 555 maxexpire - ia->ia6_updatetime) { 556 retlt->ia6t_expire = ia->ia6_updatetime + 557 ia->ia6_lifetime.ia6t_vltime; 558 } else 559 retlt->ia6t_expire = maxexpire; 560 } 561 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 562 time_t maxexpire; 563 struct in6_addrlifetime *retlt = 564 &ifr->ifr_ifru.ifru_lifetime; 565 566 /* 567 * XXX: adjust expiration time assuming time_t is 568 * signed. 569 */ 570 maxexpire = (-1) & 571 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 572 if (ia->ia6_lifetime.ia6t_pltime < 573 maxexpire - ia->ia6_updatetime) { 574 retlt->ia6t_preferred = ia->ia6_updatetime + 575 ia->ia6_lifetime.ia6t_pltime; 576 } else 577 retlt->ia6t_preferred = maxexpire; 578 } 579 break; 580 581 case SIOCAIFADDR_IN6: 582 #ifdef MAC 583 /* Check if a MAC policy disallows setting the IPv6 address. */ 584 error = mac_inet6_check_add_addr(cred, &sa6->sin6_addr, ifp); 585 if (error != 0) 586 goto out; 587 #endif 588 error = in6_addifaddr(ifp, ifra, ia); 589 ia = NULL; 590 break; 591 592 case SIOCDIFADDR_IN6: 593 in6_purgeifaddr(ia); 594 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa, 595 IFADDR_EVENT_DEL); 596 break; 597 598 default: 599 if (ifp->if_ioctl == NULL) { 600 error = EOPNOTSUPP; 601 goto out; 602 } 603 error = (*ifp->if_ioctl)(ifp, cmd, data); 604 goto out; 605 } 606 607 error = 0; 608 out: 609 if (control_locked) 610 sx_xunlock(&in6_control_sx); 611 612 if (ia != NULL) 613 ifa_free(&ia->ia_ifa); 614 return (error); 615 } 616 617 int 618 in6_control(struct socket *so, u_long cmd, void *data, 619 struct ifnet *ifp, struct thread *td) 620 { 621 return (in6_control_ioctl(cmd, data, ifp, td ? td->td_ucred : NULL)); 622 } 623 624 static struct in6_multi_mship * 625 in6_joingroup_legacy(struct ifnet *ifp, const struct in6_addr *mcaddr, 626 int *errorp, int delay) 627 { 628 struct in6_multi_mship *imm; 629 int error; 630 631 imm = malloc(sizeof(*imm), M_IP6MADDR, M_NOWAIT); 632 if (imm == NULL) { 633 *errorp = ENOBUFS; 634 return (NULL); 635 } 636 637 delay = (delay * MLD_FASTHZ) / hz; 638 639 error = in6_joingroup(ifp, mcaddr, NULL, &imm->i6mm_maddr, delay); 640 if (error) { 641 *errorp = error; 642 free(imm, M_IP6MADDR); 643 return (NULL); 644 } 645 646 return (imm); 647 } 648 649 static int 650 in6_solicited_node_maddr(struct in6_addr *maddr, 651 struct ifnet *ifp, const struct in6_addr *base) 652 { 653 int error; 654 655 bzero(maddr, sizeof(struct in6_addr)); 656 maddr->s6_addr32[0] = IPV6_ADDR_INT32_MLL; 657 maddr->s6_addr32[2] = htonl(1); 658 maddr->s6_addr32[3] = base->s6_addr32[3]; 659 maddr->s6_addr8[12] = 0xff; 660 if ((error = in6_setscope(maddr, ifp, NULL)) != 0) { 661 /* XXX: should not happen */ 662 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 663 } 664 665 return error; 666 } 667 668 /* 669 * Join necessary multicast groups. Factored out from in6_update_ifa(). 670 * This entire work should only be done once, for the default FIB. 671 */ 672 static int 673 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra, 674 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol) 675 { 676 char ip6buf[INET6_ADDRSTRLEN]; 677 struct in6_addr mltaddr; 678 struct in6_multi_mship *imm; 679 int delay, error; 680 681 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__)); 682 683 /* Join solicited multicast addr for new host id. */ 684 if ((error = in6_solicited_node_maddr(&mltaddr, ifp, 685 &ifra->ifra_addr.sin6_addr)) != 0) 686 goto cleanup; 687 delay = error = 0; 688 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 689 /* 690 * We need a random delay for DAD on the address being 691 * configured. It also means delaying transmission of the 692 * corresponding MLD report to avoid report collision. 693 * [RFC 4861, Section 6.3.7] 694 */ 695 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 696 } 697 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay); 698 if (imm == NULL) { 699 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 700 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 701 if_name(ifp), error)); 702 goto cleanup; 703 } 704 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 705 *in6m_sol = imm->i6mm_maddr; 706 707 /* 708 * Join link-local all-nodes address. 709 */ 710 mltaddr = in6addr_linklocal_allnodes; 711 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 712 goto cleanup; /* XXX: should not fail */ 713 714 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, 0); 715 if (imm == NULL) { 716 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 717 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 718 if_name(ifp), error)); 719 goto cleanup; 720 } 721 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 722 723 /* 724 * Join node information group address. 725 */ 726 delay = 0; 727 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 728 /* 729 * The spec does not say anything about delay for this group, 730 * but the same logic should apply. 731 */ 732 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 733 } 734 if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) { 735 /* XXX jinmei */ 736 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay); 737 if (imm == NULL) 738 nd6log((LOG_WARNING, 739 "%s: in6_joingroup failed for %s on %s " 740 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 741 &mltaddr), if_name(ifp), error)); 742 /* XXX not very fatal, go on... */ 743 else 744 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 745 } 746 if (V_icmp6_nodeinfo_oldmcprefix && 747 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) { 748 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay); 749 if (imm == NULL) 750 nd6log((LOG_WARNING, 751 "%s: in6_joingroup failed for %s on %s " 752 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 753 &mltaddr), if_name(ifp), error)); 754 /* XXX not very fatal, go on... */ 755 else 756 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 757 } 758 759 /* 760 * Join interface-local all-nodes address. 761 * (ff01::1%ifN, and ff01::%ifN/32) 762 */ 763 mltaddr = in6addr_nodelocal_allnodes; 764 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 765 goto cleanup; /* XXX: should not fail */ 766 767 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, 0); 768 if (imm == NULL) { 769 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 770 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 771 &mltaddr), if_name(ifp), error)); 772 goto cleanup; 773 } 774 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 775 776 cleanup: 777 return (error); 778 } 779 780 /* 781 * Update parameters of an IPv6 interface address. 782 * If necessary, a new entry is created and linked into address chains. 783 * This function is separated from in6_control(). 784 */ 785 int 786 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 787 struct in6_ifaddr *ia, int flags) 788 { 789 int error, hostIsNew = 0; 790 791 if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0) 792 return (error); 793 794 if (ia == NULL) { 795 hostIsNew = 1; 796 if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL) 797 return (ENOBUFS); 798 } 799 800 error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags); 801 if (error != 0) { 802 if (hostIsNew != 0) { 803 in6_unlink_ifa(ia, ifp); 804 ifa_free(&ia->ia_ifa); 805 } 806 return (error); 807 } 808 809 if (hostIsNew) 810 error = in6_broadcast_ifa(ifp, ifra, ia, flags); 811 812 return (error); 813 } 814 815 /* 816 * Fill in basic IPv6 address request info. 817 */ 818 void 819 in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr, 820 const struct in6_addr *mask) 821 { 822 823 memset(ifra, 0, sizeof(struct in6_aliasreq)); 824 825 ifra->ifra_addr.sin6_family = AF_INET6; 826 ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 827 if (addr != NULL) 828 ifra->ifra_addr.sin6_addr = *addr; 829 830 ifra->ifra_prefixmask.sin6_family = AF_INET6; 831 ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 832 if (mask != NULL) 833 ifra->ifra_prefixmask.sin6_addr = *mask; 834 } 835 836 static int 837 in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra, 838 struct in6_ifaddr *ia, int flags) 839 { 840 int plen = -1; 841 struct sockaddr_in6 dst6; 842 struct in6_addrlifetime *lt; 843 char ip6buf[INET6_ADDRSTRLEN]; 844 845 /* Validate parameters */ 846 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 847 return (EINVAL); 848 849 /* 850 * The destination address for a p2p link must have a family 851 * of AF_UNSPEC or AF_INET6. 852 */ 853 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 854 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 855 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 856 return (EAFNOSUPPORT); 857 858 /* 859 * Validate address 860 */ 861 if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) || 862 ifra->ifra_addr.sin6_family != AF_INET6) 863 return (EINVAL); 864 865 /* 866 * validate ifra_prefixmask. don't check sin6_family, netmask 867 * does not carry fields other than sin6_len. 868 */ 869 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 870 return (EINVAL); 871 /* 872 * Because the IPv6 address architecture is classless, we require 873 * users to specify a (non 0) prefix length (mask) for a new address. 874 * We also require the prefix (when specified) mask is valid, and thus 875 * reject a non-consecutive mask. 876 */ 877 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 878 return (EINVAL); 879 if (ifra->ifra_prefixmask.sin6_len != 0) { 880 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 881 (u_char *)&ifra->ifra_prefixmask + 882 ifra->ifra_prefixmask.sin6_len); 883 if (plen <= 0) 884 return (EINVAL); 885 } else { 886 /* 887 * In this case, ia must not be NULL. We just use its prefix 888 * length. 889 */ 890 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 891 } 892 /* 893 * If the destination address on a p2p interface is specified, 894 * and the address is a scoped one, validate/set the scope 895 * zone identifier. 896 */ 897 dst6 = ifra->ifra_dstaddr; 898 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 899 (dst6.sin6_family == AF_INET6)) { 900 struct in6_addr in6_tmp; 901 u_int32_t zoneid; 902 903 in6_tmp = dst6.sin6_addr; 904 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 905 return (EINVAL); /* XXX: should be impossible */ 906 907 if (dst6.sin6_scope_id != 0) { 908 if (dst6.sin6_scope_id != zoneid) 909 return (EINVAL); 910 } else /* user omit to specify the ID. */ 911 dst6.sin6_scope_id = zoneid; 912 913 /* convert into the internal form */ 914 if (sa6_embedscope(&dst6, 0)) 915 return (EINVAL); /* XXX: should be impossible */ 916 } 917 /* Modify original ifra_dstaddr to reflect changes */ 918 ifra->ifra_dstaddr = dst6; 919 920 /* 921 * The destination address can be specified only for a p2p or a 922 * loopback interface. If specified, the corresponding prefix length 923 * must be 128. 924 */ 925 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 926 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 927 /* XXX: noisy message */ 928 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 929 "be specified for a p2p or a loopback IF only\n")); 930 return (EINVAL); 931 } 932 if (plen != 128) { 933 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 934 "be 128 when dstaddr is specified\n")); 935 return (EINVAL); 936 } 937 } 938 /* lifetime consistency check */ 939 lt = &ifra->ifra_lifetime; 940 if (lt->ia6t_pltime > lt->ia6t_vltime) 941 return (EINVAL); 942 if (lt->ia6t_vltime == 0) { 943 /* 944 * the following log might be noisy, but this is a typical 945 * configuration mistake or a tool's bug. 946 */ 947 nd6log((LOG_INFO, 948 "in6_update_ifa: valid lifetime is 0 for %s\n", 949 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr))); 950 951 if (ia == NULL) 952 return (0); /* there's nothing to do */ 953 } 954 955 /* Check prefix mask */ 956 if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) { 957 /* 958 * We prohibit changing the prefix length of an existing 959 * address, because 960 * + such an operation should be rare in IPv6, and 961 * + the operation would confuse prefix management. 962 */ 963 if (ia->ia_prefixmask.sin6_len != 0 && 964 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 965 nd6log((LOG_INFO, "in6_validate_ifa: the prefix length " 966 "of an existing %s address should not be changed\n", 967 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 968 969 return (EINVAL); 970 } 971 } 972 973 return (0); 974 } 975 976 /* 977 * Allocate a new ifaddr and link it into chains. 978 */ 979 static struct in6_ifaddr * 980 in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags) 981 { 982 struct in6_ifaddr *ia; 983 984 /* 985 * When in6_alloc_ifa() is called in a process of a received 986 * RA, it is called under an interrupt context. So, we should 987 * call malloc with M_NOWAIT. 988 */ 989 ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT); 990 if (ia == NULL) 991 return (NULL); 992 LIST_INIT(&ia->ia6_memberships); 993 /* Initialize the address and masks, and put time stamp */ 994 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 995 ia->ia_addr.sin6_family = AF_INET6; 996 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 997 /* XXX: Can we assign ,sin6_addr and skip the rest? */ 998 ia->ia_addr = ifra->ifra_addr; 999 ia->ia6_createtime = time_uptime; 1000 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1001 /* 1002 * Some functions expect that ifa_dstaddr is not 1003 * NULL for p2p interfaces. 1004 */ 1005 ia->ia_ifa.ifa_dstaddr = 1006 (struct sockaddr *)&ia->ia_dstaddr; 1007 } else { 1008 ia->ia_ifa.ifa_dstaddr = NULL; 1009 } 1010 1011 /* set prefix mask if any */ 1012 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 1013 if (ifra->ifra_prefixmask.sin6_len != 0) { 1014 ia->ia_prefixmask.sin6_family = AF_INET6; 1015 ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len; 1016 ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr; 1017 } 1018 1019 ia->ia_ifp = ifp; 1020 ifa_ref(&ia->ia_ifa); /* if_addrhead */ 1021 IF_ADDR_WLOCK(ifp); 1022 CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1023 IF_ADDR_WUNLOCK(ifp); 1024 1025 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */ 1026 IN6_IFADDR_WLOCK(); 1027 CK_STAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link); 1028 CK_LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash); 1029 IN6_IFADDR_WUNLOCK(); 1030 1031 return (ia); 1032 } 1033 1034 /* 1035 * Update/configure interface address parameters: 1036 * 1037 * 1) Update lifetime 1038 * 2) Update interface metric ad flags 1039 * 3) Notify other subsystems 1040 */ 1041 static int 1042 in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra, 1043 struct in6_ifaddr *ia, int hostIsNew, int flags) 1044 { 1045 int error; 1046 1047 /* update timestamp */ 1048 ia->ia6_updatetime = time_uptime; 1049 1050 /* 1051 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1052 * to see if the address is deprecated or invalidated, but initialize 1053 * these members for applications. 1054 */ 1055 ia->ia6_lifetime = ifra->ifra_lifetime; 1056 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1057 ia->ia6_lifetime.ia6t_expire = 1058 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1059 } else 1060 ia->ia6_lifetime.ia6t_expire = 0; 1061 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1062 ia->ia6_lifetime.ia6t_preferred = 1063 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1064 } else 1065 ia->ia6_lifetime.ia6t_preferred = 0; 1066 1067 /* 1068 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1069 * userland, make it deprecated. 1070 */ 1071 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1072 ia->ia6_lifetime.ia6t_pltime = 0; 1073 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1074 } 1075 1076 /* 1077 * configure address flags. 1078 */ 1079 ia->ia6_flags = ifra->ifra_flags; 1080 1081 /* 1082 * Make the address tentative before joining multicast addresses, 1083 * so that corresponding MLD responses would not have a tentative 1084 * source address. 1085 */ 1086 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1087 1088 /* 1089 * DAD should be performed for an new address or addresses on 1090 * an interface with ND6_IFF_IFDISABLED. 1091 */ 1092 if (in6if_do_dad(ifp) && 1093 (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED))) 1094 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1095 1096 /* notify other subsystems */ 1097 error = in6_notify_ifa(ifp, ia, ifra, hostIsNew); 1098 1099 return (error); 1100 } 1101 1102 /* 1103 * Do link-level ifa job: 1104 * 1) Add lle entry for added address 1105 * 2) Notifies routing socket users about new address 1106 * 3) join appropriate multicast group 1107 * 4) start DAD if enabled 1108 */ 1109 static int 1110 in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1111 struct in6_ifaddr *ia, int flags) 1112 { 1113 struct in6_multi *in6m_sol; 1114 int error = 0; 1115 1116 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1117 if ((error = nd6_add_ifa_lle(ia)) != 0) { 1118 in6_purgeaddr(&ia->ia_ifa); 1119 ifa_free(&ia->ia_ifa); 1120 return (error); 1121 } 1122 1123 /* Join necessary multicast groups. */ 1124 in6m_sol = NULL; 1125 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1126 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol); 1127 if (error != 0) { 1128 in6_purgeaddr(&ia->ia_ifa); 1129 ifa_free(&ia->ia_ifa); 1130 return (error); 1131 } 1132 } 1133 1134 /* Perform DAD, if the address is TENTATIVE. */ 1135 if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) { 1136 int delay, mindelay, maxdelay; 1137 1138 delay = 0; 1139 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1140 /* 1141 * We need to impose a delay before sending an NS 1142 * for DAD. Check if we also needed a delay for the 1143 * corresponding MLD message. If we did, the delay 1144 * should be larger than the MLD delay (this could be 1145 * relaxed a bit, but this simple logic is at least 1146 * safe). 1147 * XXX: Break data hiding guidelines and look at 1148 * state for the solicited multicast group. 1149 */ 1150 mindelay = 0; 1151 if (in6m_sol != NULL && 1152 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) { 1153 mindelay = in6m_sol->in6m_timer; 1154 } 1155 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1156 if (maxdelay - mindelay == 0) 1157 delay = 0; 1158 else { 1159 delay = 1160 (arc4random() % (maxdelay - mindelay)) + 1161 mindelay; 1162 } 1163 } 1164 nd6_dad_start((struct ifaddr *)ia, delay); 1165 } 1166 1167 in6_newaddrmsg(ia, RTM_ADD); 1168 ifa_free(&ia->ia_ifa); 1169 return (error); 1170 } 1171 1172 /* 1173 * Adds or deletes interface route for p2p ifa. 1174 * Returns 0 on success or errno. 1175 */ 1176 static int 1177 in6_handle_dstaddr_rtrequest(int cmd, struct in6_ifaddr *ia) 1178 { 1179 struct epoch_tracker et; 1180 struct ifaddr *ifa = &ia->ia_ifa; 1181 int error; 1182 1183 /* Prepare gateway */ 1184 struct sockaddr_dl_short sdl = { 1185 .sdl_family = AF_LINK, 1186 .sdl_len = sizeof(struct sockaddr_dl_short), 1187 .sdl_type = ifa->ifa_ifp->if_type, 1188 .sdl_index = ifa->ifa_ifp->if_index, 1189 }; 1190 1191 struct sockaddr_in6 dst = { 1192 .sin6_family = AF_INET6, 1193 .sin6_len = sizeof(struct sockaddr_in6), 1194 .sin6_addr = ia->ia_dstaddr.sin6_addr, 1195 }; 1196 1197 struct rt_addrinfo info = { 1198 .rti_ifa = ifa, 1199 .rti_ifp = ifa->ifa_ifp, 1200 .rti_flags = RTF_PINNED | RTF_HOST, 1201 .rti_info = { 1202 [RTAX_DST] = (struct sockaddr *)&dst, 1203 [RTAX_GATEWAY] = (struct sockaddr *)&sdl, 1204 }, 1205 }; 1206 /* Don't set additional per-gw filters on removal */ 1207 1208 NET_EPOCH_ENTER(et); 1209 error = rib_handle_ifaddr_info(ifa->ifa_ifp->if_fib, cmd, &info); 1210 NET_EPOCH_EXIT(et); 1211 1212 return (error); 1213 } 1214 1215 static bool 1216 ifa_is_p2p(struct in6_ifaddr *ia) 1217 { 1218 int plen; 1219 1220 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1221 1222 if ((plen == 128) && (ia->ia_dstaddr.sin6_family == AF_INET6) && 1223 !IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &ia->ia_dstaddr.sin6_addr)) 1224 return (true); 1225 1226 return (false); 1227 } 1228 1229 int 1230 in6_addifaddr(struct ifnet *ifp, struct in6_aliasreq *ifra, struct in6_ifaddr *ia) 1231 { 1232 struct nd_prefixctl pr0; 1233 struct nd_prefix *pr; 1234 int carp_attached = 0; 1235 int error; 1236 1237 /* 1238 * first, make or update the interface address structure, 1239 * and link it to the list. 1240 */ 1241 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 1242 goto out; 1243 if (ia != NULL) { 1244 if (ia->ia_ifa.ifa_carp) 1245 (*carp_detach_p)(&ia->ia_ifa, true); 1246 ifa_free(&ia->ia_ifa); 1247 } 1248 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) == NULL) { 1249 /* 1250 * this can happen when the user specify the 0 valid 1251 * lifetime. 1252 */ 1253 return (0); 1254 } 1255 1256 if (ifra->ifra_vhid > 0) { 1257 if (carp_attach_p != NULL) 1258 error = (*carp_attach_p)(&ia->ia_ifa, 1259 ifra->ifra_vhid); 1260 else 1261 error = EPROTONOSUPPORT; 1262 if (error) 1263 goto out; 1264 else 1265 carp_attached = 1; 1266 } 1267 1268 /* 1269 * then, make the prefix on-link on the interface. 1270 * XXX: we'd rather create the prefix before the address, but 1271 * we need at least one address to install the corresponding 1272 * interface route, so we configure the address first. 1273 */ 1274 1275 /* 1276 * convert mask to prefix length (prefixmask has already 1277 * been validated in in6_update_ifa(). 1278 */ 1279 bzero(&pr0, sizeof(pr0)); 1280 pr0.ndpr_ifp = ifp; 1281 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 1282 NULL); 1283 if (pr0.ndpr_plen == 128) { 1284 /* we don't need to install a host route. */ 1285 goto aifaddr_out; 1286 } 1287 pr0.ndpr_prefix = ifra->ifra_addr; 1288 /* apply the mask for safety. */ 1289 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, 1290 &ifra->ifra_prefixmask.sin6_addr); 1291 1292 /* 1293 * XXX: since we don't have an API to set prefix (not address) 1294 * lifetimes, we just use the same lifetimes as addresses. 1295 * The (temporarily) installed lifetimes can be overridden by 1296 * later advertised RAs (when accept_rtadv is non 0), which is 1297 * an intended behavior. 1298 */ 1299 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 1300 pr0.ndpr_raf_auto = 1301 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 1302 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 1303 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 1304 1305 /* add the prefix if not yet. */ 1306 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 1307 /* 1308 * nd6_prelist_add will install the corresponding 1309 * interface route. 1310 */ 1311 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) { 1312 if (carp_attached) 1313 (*carp_detach_p)(&ia->ia_ifa, false); 1314 goto out; 1315 } 1316 } 1317 1318 /* relate the address to the prefix */ 1319 if (ia->ia6_ndpr == NULL) { 1320 ia->ia6_ndpr = pr; 1321 pr->ndpr_addrcnt++; 1322 1323 /* 1324 * If this is the first autoconf address from the 1325 * prefix, create a temporary address as well 1326 * (when required). 1327 */ 1328 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 1329 V_ip6_use_tempaddr && pr->ndpr_addrcnt == 1) { 1330 int e; 1331 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 1332 log(LOG_NOTICE, "in6_control: failed " 1333 "to create a temporary address, " 1334 "errno=%d\n", e); 1335 } 1336 } 1337 } 1338 nd6_prefix_rele(pr); 1339 1340 /* 1341 * this might affect the status of autoconfigured addresses, 1342 * that is, this address might make other addresses detached. 1343 */ 1344 pfxlist_onlink_check(); 1345 1346 aifaddr_out: 1347 /* 1348 * Try to clear the flag when a new IPv6 address is added 1349 * onto an IFDISABLED interface and it succeeds. 1350 */ 1351 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) { 1352 struct in6_ndireq nd; 1353 1354 memset(&nd, 0, sizeof(nd)); 1355 nd.ndi.flags = ND_IFINFO(ifp)->flags; 1356 nd.ndi.flags &= ~ND6_IFF_IFDISABLED; 1357 if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0) 1358 log(LOG_NOTICE, "SIOCAIFADDR_IN6: " 1359 "SIOCSIFINFO_FLAGS for -ifdisabled " 1360 "failed."); 1361 /* 1362 * Ignore failure of clearing the flag intentionally. 1363 * The failure means address duplication was detected. 1364 */ 1365 } 1366 error = 0; 1367 1368 out: 1369 if (ia != NULL) 1370 ifa_free(&ia->ia_ifa); 1371 return (error); 1372 } 1373 1374 void 1375 in6_purgeaddr(struct ifaddr *ifa) 1376 { 1377 struct ifnet *ifp = ifa->ifa_ifp; 1378 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1379 struct in6_multi_mship *imm; 1380 int error; 1381 1382 if (ifa->ifa_carp) 1383 (*carp_detach_p)(ifa, false); 1384 1385 /* 1386 * Remove the loopback route to the interface address. 1387 * The check for the current setting of "nd6_useloopback" 1388 * is not needed. 1389 */ 1390 if (ia->ia_flags & IFA_RTSELF) { 1391 error = ifa_del_loopback_route((struct ifaddr *)ia, 1392 (struct sockaddr *)&ia->ia_addr); 1393 if (error == 0) 1394 ia->ia_flags &= ~IFA_RTSELF; 1395 } 1396 1397 /* stop DAD processing */ 1398 nd6_dad_stop(ifa); 1399 1400 /* Leave multicast groups. */ 1401 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1402 LIST_REMOVE(imm, i6mm_chain); 1403 if (imm->i6mm_maddr != NULL) 1404 in6_leavegroup(imm->i6mm_maddr, NULL); 1405 free(imm, M_IP6MADDR); 1406 } 1407 /* Check if we need to remove p2p route */ 1408 if ((ia->ia_flags & IFA_ROUTE) && ifa_is_p2p(ia)) { 1409 error = in6_handle_dstaddr_rtrequest(RTM_DELETE, ia); 1410 if (error != 0) 1411 log(LOG_INFO, "%s: err=%d, destination address delete " 1412 "failed\n", __func__, error); 1413 ia->ia_flags &= ~IFA_ROUTE; 1414 } 1415 1416 in6_newaddrmsg(ia, RTM_DELETE); 1417 in6_unlink_ifa(ia, ifp); 1418 } 1419 1420 /* 1421 * Removes @ia from the corresponding interfaces and unlinks corresponding 1422 * prefix if no addresses are using it anymore. 1423 */ 1424 void 1425 in6_purgeifaddr(struct in6_ifaddr *ia) 1426 { 1427 struct nd_prefix *pr; 1428 1429 /* 1430 * If the address being deleted is the only one that owns 1431 * the corresponding prefix, expire the prefix as well. 1432 * XXX: theoretically, we don't have to worry about such 1433 * relationship, since we separate the address management 1434 * and the prefix management. We do this, however, to provide 1435 * as much backward compatibility as possible in terms of 1436 * the ioctl operation. 1437 * Note that in6_purgeaddr() will decrement ndpr_addrcnt. 1438 */ 1439 pr = ia->ia6_ndpr; 1440 in6_purgeaddr(&ia->ia_ifa); 1441 if (pr != NULL && pr->ndpr_addrcnt == 0) { 1442 ND6_WLOCK(); 1443 nd6_prefix_unlink(pr, NULL); 1444 ND6_WUNLOCK(); 1445 nd6_prefix_del(pr); 1446 } 1447 } 1448 1449 1450 static void 1451 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1452 { 1453 char ip6buf[INET6_ADDRSTRLEN]; 1454 int remove_lle; 1455 1456 IF_ADDR_WLOCK(ifp); 1457 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link); 1458 IF_ADDR_WUNLOCK(ifp); 1459 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1460 1461 /* 1462 * Defer the release of what might be the last reference to the 1463 * in6_ifaddr so that it can't be freed before the remainder of the 1464 * cleanup. 1465 */ 1466 IN6_IFADDR_WLOCK(); 1467 CK_STAILQ_REMOVE(&V_in6_ifaddrhead, ia, in6_ifaddr, ia_link); 1468 CK_LIST_REMOVE(ia, ia6_hash); 1469 IN6_IFADDR_WUNLOCK(); 1470 1471 /* 1472 * Release the reference to the base prefix. There should be a 1473 * positive reference. 1474 */ 1475 remove_lle = 0; 1476 if (ia->ia6_ndpr == NULL) { 1477 nd6log((LOG_NOTICE, 1478 "in6_unlink_ifa: autoconf'ed address " 1479 "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia)))); 1480 } else { 1481 ia->ia6_ndpr->ndpr_addrcnt--; 1482 /* Do not delete lles within prefix if refcont != 0 */ 1483 if (ia->ia6_ndpr->ndpr_addrcnt == 0) 1484 remove_lle = 1; 1485 ia->ia6_ndpr = NULL; 1486 } 1487 1488 nd6_rem_ifa_lle(ia, remove_lle); 1489 1490 /* 1491 * Also, if the address being removed is autoconf'ed, call 1492 * pfxlist_onlink_check() since the release might affect the status of 1493 * other (detached) addresses. 1494 */ 1495 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1496 pfxlist_onlink_check(); 1497 } 1498 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1499 } 1500 1501 /* 1502 * Notifies other subsystems about address change/arrival: 1503 * 1) Notifies device handler on the first IPv6 address assignment 1504 * 2) Handle routing table changes for P2P links and route 1505 * 3) Handle routing table changes for address host route 1506 */ 1507 static int 1508 in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia, 1509 struct in6_aliasreq *ifra, int hostIsNew) 1510 { 1511 int error = 0, ifacount = 0; 1512 struct ifaddr *ifa; 1513 struct sockaddr_in6 *pdst; 1514 char ip6buf[INET6_ADDRSTRLEN]; 1515 1516 /* 1517 * Give the interface a chance to initialize 1518 * if this is its first address, 1519 */ 1520 if (hostIsNew != 0) { 1521 struct epoch_tracker et; 1522 1523 NET_EPOCH_ENTER(et); 1524 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1525 if (ifa->ifa_addr->sa_family != AF_INET6) 1526 continue; 1527 ifacount++; 1528 } 1529 NET_EPOCH_EXIT(et); 1530 } 1531 1532 if (ifacount <= 1 && ifp->if_ioctl) { 1533 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1534 if (error) 1535 goto done; 1536 } 1537 1538 /* 1539 * If a new destination address is specified, scrub the old one and 1540 * install the new destination. Note that the interface must be 1541 * p2p or loopback. 1542 */ 1543 pdst = &ifra->ifra_dstaddr; 1544 if (pdst->sin6_family == AF_INET6 && 1545 !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1546 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1547 (in6_handle_dstaddr_rtrequest(RTM_DELETE, ia) != 0)) { 1548 nd6log((LOG_ERR, "in6_update_ifa_internal: failed to " 1549 "remove a route to the old destination: %s\n", 1550 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1551 /* proceed anyway... */ 1552 } else 1553 ia->ia_flags &= ~IFA_ROUTE; 1554 ia->ia_dstaddr = *pdst; 1555 } 1556 1557 /* 1558 * If a new destination address is specified for a point-to-point 1559 * interface, install a route to the destination as an interface 1560 * direct route. 1561 * XXX: the logic below rejects assigning multiple addresses on a p2p 1562 * interface that share the same destination. 1563 */ 1564 if (!(ia->ia_flags & IFA_ROUTE) && ifa_is_p2p(ia)) { 1565 error = in6_handle_dstaddr_rtrequest(RTM_ADD, ia); 1566 if (error) 1567 goto done; 1568 ia->ia_flags |= IFA_ROUTE; 1569 } 1570 1571 /* 1572 * add a loopback route to self if not exists 1573 */ 1574 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) { 1575 error = ifa_add_loopback_route((struct ifaddr *)ia, 1576 (struct sockaddr *)&ia->ia_addr); 1577 if (error == 0) 1578 ia->ia_flags |= IFA_RTSELF; 1579 } 1580 done: 1581 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 1582 "Invoking IPv6 network device address event may sleep"); 1583 1584 ifa_ref(&ia->ia_ifa); 1585 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa, 1586 IFADDR_EVENT_ADD); 1587 ifa_free(&ia->ia_ifa); 1588 1589 return (error); 1590 } 1591 1592 /* 1593 * Find an IPv6 interface link-local address specific to an interface. 1594 * ifaddr is returned referenced. 1595 */ 1596 struct in6_ifaddr * 1597 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1598 { 1599 struct ifaddr *ifa; 1600 1601 NET_EPOCH_ASSERT(); 1602 1603 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1604 if (ifa->ifa_addr->sa_family != AF_INET6) 1605 continue; 1606 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1607 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1608 ignoreflags) != 0) 1609 continue; 1610 ifa_ref(ifa); 1611 break; 1612 } 1613 } 1614 1615 return ((struct in6_ifaddr *)ifa); 1616 } 1617 1618 /* 1619 * find the interface address corresponding to a given IPv6 address. 1620 * ifaddr is returned referenced if @referenced flag is set. 1621 */ 1622 struct in6_ifaddr * 1623 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid, bool referenced) 1624 { 1625 struct rm_priotracker in6_ifa_tracker; 1626 struct in6_ifaddr *ia; 1627 1628 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1629 CK_LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) { 1630 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1631 if (zoneid != 0 && 1632 zoneid != ia->ia_addr.sin6_scope_id) 1633 continue; 1634 if (referenced) 1635 ifa_ref(&ia->ia_ifa); 1636 break; 1637 } 1638 } 1639 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1640 return (ia); 1641 } 1642 1643 /* 1644 * find the internet address corresponding to a given interface and address. 1645 * ifaddr is returned referenced. 1646 */ 1647 struct in6_ifaddr * 1648 in6ifa_ifpwithaddr(struct ifnet *ifp, const struct in6_addr *addr) 1649 { 1650 struct epoch_tracker et; 1651 struct ifaddr *ifa; 1652 1653 NET_EPOCH_ENTER(et); 1654 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1655 if (ifa->ifa_addr->sa_family != AF_INET6) 1656 continue; 1657 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1658 ifa_ref(ifa); 1659 break; 1660 } 1661 } 1662 NET_EPOCH_EXIT(et); 1663 1664 return ((struct in6_ifaddr *)ifa); 1665 } 1666 1667 /* 1668 * Find a link-local scoped address on ifp and return it if any. 1669 */ 1670 struct in6_ifaddr * 1671 in6ifa_llaonifp(struct ifnet *ifp) 1672 { 1673 struct epoch_tracker et; 1674 struct sockaddr_in6 *sin6; 1675 struct ifaddr *ifa; 1676 1677 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1678 return (NULL); 1679 NET_EPOCH_ENTER(et); 1680 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1681 if (ifa->ifa_addr->sa_family != AF_INET6) 1682 continue; 1683 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 1684 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 1685 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) || 1686 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr)) 1687 break; 1688 } 1689 NET_EPOCH_EXIT(et); 1690 1691 return ((struct in6_ifaddr *)ifa); 1692 } 1693 1694 /* 1695 * Convert IP6 address to printable (loggable) representation. Caller 1696 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 1697 */ 1698 static char digits[] = "0123456789abcdef"; 1699 char * 1700 ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 1701 { 1702 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0; 1703 char *cp; 1704 const u_int16_t *a = (const u_int16_t *)addr; 1705 const u_int8_t *d; 1706 int dcolon = 0, zero = 0; 1707 1708 cp = ip6buf; 1709 1710 for (i = 0; i < 8; i++) { 1711 if (*(a + i) == 0) { 1712 cnt++; 1713 if (cnt == 1) 1714 idx = i; 1715 } 1716 else if (maxcnt < cnt) { 1717 maxcnt = cnt; 1718 index = idx; 1719 cnt = 0; 1720 } 1721 } 1722 if (maxcnt < cnt) { 1723 maxcnt = cnt; 1724 index = idx; 1725 } 1726 1727 for (i = 0; i < 8; i++) { 1728 if (dcolon == 1) { 1729 if (*a == 0) { 1730 if (i == 7) 1731 *cp++ = ':'; 1732 a++; 1733 continue; 1734 } else 1735 dcolon = 2; 1736 } 1737 if (*a == 0) { 1738 if (dcolon == 0 && *(a + 1) == 0 && i == index) { 1739 if (i == 0) 1740 *cp++ = ':'; 1741 *cp++ = ':'; 1742 dcolon = 1; 1743 } else { 1744 *cp++ = '0'; 1745 *cp++ = ':'; 1746 } 1747 a++; 1748 continue; 1749 } 1750 d = (const u_char *)a; 1751 /* Try to eliminate leading zeros in printout like in :0001. */ 1752 zero = 1; 1753 *cp = digits[*d >> 4]; 1754 if (*cp != '0') { 1755 zero = 0; 1756 cp++; 1757 } 1758 *cp = digits[*d++ & 0xf]; 1759 if (zero == 0 || (*cp != '0')) { 1760 zero = 0; 1761 cp++; 1762 } 1763 *cp = digits[*d >> 4]; 1764 if (zero == 0 || (*cp != '0')) { 1765 zero = 0; 1766 cp++; 1767 } 1768 *cp++ = digits[*d & 0xf]; 1769 *cp++ = ':'; 1770 a++; 1771 } 1772 *--cp = '\0'; 1773 return (ip6buf); 1774 } 1775 1776 int 1777 in6_localaddr(struct in6_addr *in6) 1778 { 1779 struct rm_priotracker in6_ifa_tracker; 1780 struct in6_ifaddr *ia; 1781 1782 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1783 return 1; 1784 1785 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1786 CK_STAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 1787 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1788 &ia->ia_prefixmask.sin6_addr)) { 1789 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1790 return 1; 1791 } 1792 } 1793 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1794 1795 return (0); 1796 } 1797 1798 /* 1799 * Return 1 if an internet address is for the local host and configured 1800 * on one of its interfaces. 1801 */ 1802 int 1803 in6_localip(struct in6_addr *in6) 1804 { 1805 struct rm_priotracker in6_ifa_tracker; 1806 struct in6_ifaddr *ia; 1807 1808 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1809 CK_LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 1810 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) { 1811 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1812 return (1); 1813 } 1814 } 1815 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1816 return (0); 1817 } 1818 1819 /* 1820 * Like in6_localip(), but FIB-aware and carp(4)-aware. 1821 */ 1822 bool 1823 in6_localip_fib(struct in6_addr *in6, uint16_t fib) 1824 { 1825 struct rm_priotracker in6_ifa_tracker; 1826 struct in6_ifaddr *ia; 1827 1828 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1829 CK_LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 1830 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr) && 1831 (ia->ia_ifa.ifa_carp == NULL || 1832 carp_master_p(&ia->ia_ifa)) && 1833 ia->ia_ifa.ifa_ifp->if_fib == fib) { 1834 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1835 return (true); 1836 } 1837 } 1838 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1839 return (false); 1840 } 1841 1842 /* 1843 * Return 1 if an internet address is configured on an interface. 1844 */ 1845 int 1846 in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr) 1847 { 1848 struct in6_addr in6; 1849 struct ifaddr *ifa; 1850 struct in6_ifaddr *ia6; 1851 1852 NET_EPOCH_ASSERT(); 1853 1854 in6 = *addr; 1855 if (in6_clearscope(&in6)) 1856 return (0); 1857 in6_setscope(&in6, ifp, NULL); 1858 1859 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1860 if (ifa->ifa_addr->sa_family != AF_INET6) 1861 continue; 1862 ia6 = (struct in6_ifaddr *)ifa; 1863 if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) 1864 return (1); 1865 } 1866 1867 return (0); 1868 } 1869 1870 int 1871 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1872 { 1873 struct rm_priotracker in6_ifa_tracker; 1874 struct in6_ifaddr *ia; 1875 1876 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1877 CK_LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) { 1878 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) { 1879 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 1880 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1881 return (1); /* true */ 1882 } 1883 break; 1884 } 1885 } 1886 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1887 1888 return (0); /* false */ 1889 } 1890 1891 /* 1892 * return length of part which dst and src are equal 1893 * hard coding... 1894 */ 1895 int 1896 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1897 { 1898 int match = 0; 1899 u_char *s = (u_char *)src, *d = (u_char *)dst; 1900 u_char *lim = s + 16, r; 1901 1902 while (s < lim) 1903 if ((r = (*d++ ^ *s++)) != 0) { 1904 while (r < 128) { 1905 match++; 1906 r <<= 1; 1907 } 1908 break; 1909 } else 1910 match += 8; 1911 return match; 1912 } 1913 1914 /* XXX: to be scope conscious */ 1915 int 1916 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1917 { 1918 int bytelen, bitlen; 1919 1920 /* sanity check */ 1921 if (0 > len || len > 128) { 1922 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1923 len); 1924 return (0); 1925 } 1926 1927 bytelen = len / 8; 1928 bitlen = len % 8; 1929 1930 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1931 return (0); 1932 if (bitlen != 0 && 1933 p1->s6_addr[bytelen] >> (8 - bitlen) != 1934 p2->s6_addr[bytelen] >> (8 - bitlen)) 1935 return (0); 1936 1937 return (1); 1938 } 1939 1940 void 1941 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1942 { 1943 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1944 int bytelen, bitlen, i; 1945 1946 /* sanity check */ 1947 if (0 > len || len > 128) { 1948 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1949 len); 1950 return; 1951 } 1952 1953 bzero(maskp, sizeof(*maskp)); 1954 bytelen = len / 8; 1955 bitlen = len % 8; 1956 for (i = 0; i < bytelen; i++) 1957 maskp->s6_addr[i] = 0xff; 1958 if (bitlen) 1959 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1960 } 1961 1962 /* 1963 * return the best address out of the same scope. if no address was 1964 * found, return the first valid address from designated IF. 1965 */ 1966 struct in6_ifaddr * 1967 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 1968 { 1969 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 1970 struct ifaddr *ifa; 1971 struct in6_ifaddr *besta = NULL; 1972 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 1973 1974 NET_EPOCH_ASSERT(); 1975 1976 dep[0] = dep[1] = NULL; 1977 1978 /* 1979 * We first look for addresses in the same scope. 1980 * If there is one, return it. 1981 * If two or more, return one which matches the dst longest. 1982 * If none, return one of global addresses assigned other ifs. 1983 */ 1984 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1985 if (ifa->ifa_addr->sa_family != AF_INET6) 1986 continue; 1987 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1988 continue; /* XXX: is there any case to allow anycast? */ 1989 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1990 continue; /* don't use this interface */ 1991 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1992 continue; 1993 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1994 if (V_ip6_use_deprecated) 1995 dep[0] = (struct in6_ifaddr *)ifa; 1996 continue; 1997 } 1998 1999 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2000 /* 2001 * call in6_matchlen() as few as possible 2002 */ 2003 if (besta) { 2004 if (blen == -1) 2005 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2006 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2007 if (tlen > blen) { 2008 blen = tlen; 2009 besta = (struct in6_ifaddr *)ifa; 2010 } 2011 } else 2012 besta = (struct in6_ifaddr *)ifa; 2013 } 2014 } 2015 if (besta) 2016 return (besta); 2017 2018 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2019 if (ifa->ifa_addr->sa_family != AF_INET6) 2020 continue; 2021 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2022 continue; /* XXX: is there any case to allow anycast? */ 2023 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2024 continue; /* don't use this interface */ 2025 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2026 continue; 2027 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2028 if (V_ip6_use_deprecated) 2029 dep[1] = (struct in6_ifaddr *)ifa; 2030 continue; 2031 } 2032 2033 return (struct in6_ifaddr *)ifa; 2034 } 2035 2036 /* use the last-resort values, that are, deprecated addresses */ 2037 if (dep[0]) 2038 return dep[0]; 2039 if (dep[1]) 2040 return dep[1]; 2041 2042 return NULL; 2043 } 2044 2045 /* 2046 * perform DAD when interface becomes IFF_UP. 2047 */ 2048 void 2049 in6_if_up(struct ifnet *ifp) 2050 { 2051 struct epoch_tracker et; 2052 struct ifaddr *ifa; 2053 struct in6_ifaddr *ia; 2054 2055 NET_EPOCH_ENTER(et); 2056 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2057 if (ifa->ifa_addr->sa_family != AF_INET6) 2058 continue; 2059 ia = (struct in6_ifaddr *)ifa; 2060 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2061 /* 2062 * The TENTATIVE flag was likely set by hand 2063 * beforehand, implicitly indicating the need for DAD. 2064 * We may be able to skip the random delay in this 2065 * case, but we impose delays just in case. 2066 */ 2067 nd6_dad_start(ifa, 2068 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 2069 } 2070 } 2071 NET_EPOCH_EXIT(et); 2072 2073 /* 2074 * special cases, like 6to4, are handled in in6_ifattach 2075 */ 2076 in6_ifattach(ifp, NULL); 2077 } 2078 2079 static void 2080 in6_ifevent(void *arg __unused, struct ifnet *ifp, int event) 2081 { 2082 if (event == IFNET_EVENT_UP) 2083 in6_if_up(ifp); 2084 } 2085 2086 static void 2087 in6_init(void *arg __unused) 2088 { 2089 EVENTHANDLER_REGISTER(ifnet_event, in6_ifevent, NULL, EVENTHANDLER_PRI_ANY); 2090 } 2091 SYSINIT(in6_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, in6_init, NULL); 2092 2093 int 2094 in6if_do_dad(struct ifnet *ifp) 2095 { 2096 2097 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 2098 return (0); 2099 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2100 return (0); 2101 if ((ND_IFINFO(ifp)->flags & 2102 (ND6_IFF_IFDISABLED | ND6_IFF_NO_DAD)) != 0) 2103 return (0); 2104 return (1); 2105 } 2106 2107 /* 2108 * Calculate max IPv6 MTU through all the interfaces and store it 2109 * to in6_maxmtu. 2110 */ 2111 void 2112 in6_setmaxmtu(void) 2113 { 2114 struct epoch_tracker et; 2115 unsigned long maxmtu = 0; 2116 struct ifnet *ifp; 2117 2118 NET_EPOCH_ENTER(et); 2119 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2120 /* this function can be called during ifnet initialization */ 2121 if (!ifp->if_afdata[AF_INET6]) 2122 continue; 2123 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2124 IN6_LINKMTU(ifp) > maxmtu) 2125 maxmtu = IN6_LINKMTU(ifp); 2126 } 2127 NET_EPOCH_EXIT(et); 2128 if (maxmtu) /* update only when maxmtu is positive */ 2129 V_in6_maxmtu = maxmtu; 2130 } 2131 2132 /* 2133 * Provide the length of interface identifiers to be used for the link attached 2134 * to the given interface. The length should be defined in "IPv6 over 2135 * xxx-link" document. Note that address architecture might also define 2136 * the length for a particular set of address prefixes, regardless of the 2137 * link type. As clarified in rfc2462bis, those two definitions should be 2138 * consistent, and those really are as of August 2004. 2139 */ 2140 int 2141 in6_if2idlen(struct ifnet *ifp) 2142 { 2143 switch (ifp->if_type) { 2144 case IFT_ETHER: /* RFC2464 */ 2145 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2146 case IFT_L2VLAN: /* ditto */ 2147 case IFT_BRIDGE: /* bridge(4) only does Ethernet-like links */ 2148 case IFT_INFINIBAND: 2149 return (64); 2150 case IFT_PPP: /* RFC2472 */ 2151 return (64); 2152 case IFT_FRELAY: /* RFC2590 */ 2153 return (64); 2154 case IFT_IEEE1394: /* RFC3146 */ 2155 return (64); 2156 case IFT_GIF: 2157 return (64); /* draft-ietf-v6ops-mech-v2-07 */ 2158 case IFT_LOOP: 2159 return (64); /* XXX: is this really correct? */ 2160 default: 2161 /* 2162 * Unknown link type: 2163 * It might be controversial to use the today's common constant 2164 * of 64 for these cases unconditionally. For full compliance, 2165 * we should return an error in this case. On the other hand, 2166 * if we simply miss the standard for the link type or a new 2167 * standard is defined for a new link type, the IFID length 2168 * is very likely to be the common constant. As a compromise, 2169 * we always use the constant, but make an explicit notice 2170 * indicating the "unknown" case. 2171 */ 2172 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2173 return (64); 2174 } 2175 } 2176 2177 struct in6_llentry { 2178 struct llentry base; 2179 }; 2180 2181 #define IN6_LLTBL_DEFAULT_HSIZE 32 2182 #define IN6_LLTBL_HASH(k, h) \ 2183 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 2184 2185 /* 2186 * Do actual deallocation of @lle. 2187 */ 2188 static void 2189 in6_lltable_destroy_lle_unlocked(epoch_context_t ctx) 2190 { 2191 struct llentry *lle; 2192 2193 lle = __containerof(ctx, struct llentry, lle_epoch_ctx); 2194 LLE_LOCK_DESTROY(lle); 2195 LLE_REQ_DESTROY(lle); 2196 free(lle, M_LLTABLE); 2197 } 2198 2199 /* 2200 * Called by LLE_FREE_LOCKED when number of references 2201 * drops to zero. 2202 */ 2203 static void 2204 in6_lltable_destroy_lle(struct llentry *lle) 2205 { 2206 2207 LLE_WUNLOCK(lle); 2208 NET_EPOCH_CALL(in6_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx); 2209 } 2210 2211 static struct llentry * 2212 in6_lltable_new(const struct in6_addr *addr6, u_int flags) 2213 { 2214 struct in6_llentry *lle; 2215 2216 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 2217 if (lle == NULL) /* NB: caller generates msg */ 2218 return NULL; 2219 2220 lle->base.r_l3addr.addr6 = *addr6; 2221 lle->base.lle_refcnt = 1; 2222 lle->base.lle_free = in6_lltable_destroy_lle; 2223 LLE_LOCK_INIT(&lle->base); 2224 LLE_REQ_INIT(&lle->base); 2225 callout_init(&lle->base.lle_timer, 1); 2226 2227 return (&lle->base); 2228 } 2229 2230 static int 2231 in6_lltable_match_prefix(const struct sockaddr *saddr, 2232 const struct sockaddr *smask, u_int flags, struct llentry *lle) 2233 { 2234 const struct in6_addr *addr, *mask, *lle_addr; 2235 2236 addr = &((const struct sockaddr_in6 *)saddr)->sin6_addr; 2237 mask = &((const struct sockaddr_in6 *)smask)->sin6_addr; 2238 lle_addr = &lle->r_l3addr.addr6; 2239 2240 if (IN6_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0) 2241 return (0); 2242 2243 if (lle->la_flags & LLE_IFADDR) { 2244 /* 2245 * Delete LLE_IFADDR records IFF address & flag matches. 2246 * Note that addr is the interface address within prefix 2247 * being matched. 2248 */ 2249 if (IN6_ARE_ADDR_EQUAL(addr, lle_addr) && 2250 (flags & LLE_STATIC) != 0) 2251 return (1); 2252 return (0); 2253 } 2254 2255 /* flags & LLE_STATIC means deleting both dynamic and static entries */ 2256 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC)) 2257 return (1); 2258 2259 return (0); 2260 } 2261 2262 static void 2263 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle) 2264 { 2265 struct ifnet *ifp __diagused; 2266 2267 LLE_WLOCK_ASSERT(lle); 2268 KASSERT(llt != NULL, ("lltable is NULL")); 2269 2270 /* Unlink entry from table */ 2271 if ((lle->la_flags & LLE_LINKED) != 0) { 2272 ifp = llt->llt_ifp; 2273 IF_AFDATA_WLOCK_ASSERT(ifp); 2274 lltable_unlink_entry(llt, lle); 2275 } 2276 2277 llentry_free(lle); 2278 } 2279 2280 static int 2281 in6_lltable_rtcheck(struct ifnet *ifp, 2282 u_int flags, 2283 const struct sockaddr *l3addr) 2284 { 2285 const struct sockaddr_in6 *sin6; 2286 struct nhop_object *nh; 2287 struct in6_addr dst; 2288 uint32_t scopeid; 2289 char ip6buf[INET6_ADDRSTRLEN]; 2290 int fibnum; 2291 2292 NET_EPOCH_ASSERT(); 2293 KASSERT(l3addr->sa_family == AF_INET6, 2294 ("sin_family %d", l3addr->sa_family)); 2295 2296 sin6 = (const struct sockaddr_in6 *)l3addr; 2297 in6_splitscope(&sin6->sin6_addr, &dst, &scopeid); 2298 fibnum = V_rt_add_addr_allfibs ? RT_DEFAULT_FIB : ifp->if_fib; 2299 nh = fib6_lookup(fibnum, &dst, scopeid, NHR_NONE, 0); 2300 if (nh && ((nh->nh_flags & NHF_GATEWAY) || nh->nh_ifp != ifp)) { 2301 struct ifaddr *ifa; 2302 /* 2303 * Create an ND6 cache for an IPv6 neighbor 2304 * that is not covered by our own prefix. 2305 */ 2306 ifa = ifaof_ifpforaddr(l3addr, ifp); 2307 if (ifa != NULL) { 2308 return 0; 2309 } 2310 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2311 ip6_sprintf(ip6buf, &sin6->sin6_addr)); 2312 return EINVAL; 2313 } 2314 return 0; 2315 } 2316 2317 static inline uint32_t 2318 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize) 2319 { 2320 2321 return (IN6_LLTBL_HASH(dst->s6_addr32[3], hsize)); 2322 } 2323 2324 static uint32_t 2325 in6_lltable_hash(const struct llentry *lle, uint32_t hsize) 2326 { 2327 2328 return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize)); 2329 } 2330 2331 static void 2332 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 2333 { 2334 struct sockaddr_in6 *sin6; 2335 2336 sin6 = (struct sockaddr_in6 *)sa; 2337 bzero(sin6, sizeof(*sin6)); 2338 sin6->sin6_family = AF_INET6; 2339 sin6->sin6_len = sizeof(*sin6); 2340 sin6->sin6_addr = lle->r_l3addr.addr6; 2341 } 2342 2343 static inline struct llentry * 2344 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst) 2345 { 2346 struct llentry *lle; 2347 struct llentries *lleh; 2348 u_int hashidx; 2349 2350 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize); 2351 lleh = &llt->lle_head[hashidx]; 2352 CK_LIST_FOREACH(lle, lleh, lle_next) { 2353 if (lle->la_flags & LLE_DELETED) 2354 continue; 2355 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst)) 2356 break; 2357 } 2358 2359 return (lle); 2360 } 2361 2362 static void 2363 in6_lltable_delete_entry(struct lltable *llt, struct llentry *lle) 2364 { 2365 2366 lle->la_flags |= LLE_DELETED; 2367 2368 /* Leave the solicited multicast group. */ 2369 if ((lle->la_flags & LLE_PUB) != 0) 2370 in6_leave_proxy_ndp_mc(llt->llt_ifp, &lle->r_l3addr.addr6); 2371 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 2372 #ifdef DIAGNOSTIC 2373 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2374 #endif 2375 llentry_free(lle); 2376 } 2377 2378 static struct llentry * 2379 in6_lltable_alloc(struct lltable *llt, u_int flags, 2380 const struct sockaddr *l3addr) 2381 { 2382 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2383 struct ifnet *ifp = llt->llt_ifp; 2384 struct llentry *lle; 2385 char linkhdr[LLE_MAX_LINKHDR]; 2386 size_t linkhdrsize; 2387 int lladdr_off; 2388 2389 KASSERT(l3addr->sa_family == AF_INET6, 2390 ("sin_family %d", l3addr->sa_family)); 2391 2392 /* 2393 * A route that covers the given address must have 2394 * been installed 1st because we are doing a resolution, 2395 * verify this. 2396 */ 2397 if (!(flags & LLE_IFADDR) && 2398 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2399 return (NULL); 2400 2401 lle = in6_lltable_new(&sin6->sin6_addr, flags); 2402 if (lle == NULL) { 2403 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2404 return (NULL); 2405 } 2406 lle->la_flags = flags; 2407 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 2408 linkhdrsize = LLE_MAX_LINKHDR; 2409 if (lltable_calc_llheader(ifp, AF_INET6, IF_LLADDR(ifp), 2410 linkhdr, &linkhdrsize, &lladdr_off) != 0) { 2411 in6_lltable_free_entry(llt, lle); 2412 return (NULL); 2413 } 2414 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize, 2415 lladdr_off); 2416 lle->la_flags |= LLE_STATIC; 2417 } 2418 2419 if ((lle->la_flags & LLE_STATIC) != 0) 2420 lle->ln_state = ND6_LLINFO_REACHABLE; 2421 2422 return (lle); 2423 } 2424 2425 static struct llentry * 2426 in6_lltable_lookup(struct lltable *llt, u_int flags, 2427 const struct sockaddr *l3addr) 2428 { 2429 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2430 int family = flags >> 16; 2431 struct llentry *lle; 2432 2433 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 2434 KASSERT(l3addr->sa_family == AF_INET6, 2435 ("sin_family %d", l3addr->sa_family)); 2436 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) != 2437 (LLE_UNLOCKED | LLE_EXCLUSIVE), 2438 ("wrong lle request flags: %#x", flags)); 2439 2440 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2441 2442 if (__predict_false(family != AF_INET6)) 2443 lle = llentry_lookup_family(lle, family); 2444 2445 if (lle == NULL) 2446 return (NULL); 2447 2448 if (flags & LLE_UNLOCKED) 2449 return (lle); 2450 2451 if (flags & LLE_EXCLUSIVE) 2452 LLE_WLOCK(lle); 2453 else 2454 LLE_RLOCK(lle); 2455 2456 /* 2457 * If the afdata lock is not held, the LLE may have been unlinked while 2458 * we were blocked on the LLE lock. Check for this case. 2459 */ 2460 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) { 2461 if (flags & LLE_EXCLUSIVE) 2462 LLE_WUNLOCK(lle); 2463 else 2464 LLE_RUNLOCK(lle); 2465 return (NULL); 2466 } 2467 return (lle); 2468 } 2469 2470 static int 2471 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 2472 struct sysctl_req *wr) 2473 { 2474 struct ifnet *ifp = llt->llt_ifp; 2475 /* XXX stack use */ 2476 struct { 2477 struct rt_msghdr rtm; 2478 struct sockaddr_in6 sin6; 2479 /* 2480 * ndp.c assumes that sdl is word aligned 2481 */ 2482 #ifdef __LP64__ 2483 uint32_t pad; 2484 #endif 2485 struct sockaddr_dl sdl; 2486 } ndpc; 2487 struct sockaddr_dl *sdl; 2488 int error; 2489 2490 bzero(&ndpc, sizeof(ndpc)); 2491 /* skip deleted entries */ 2492 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 2493 return (0); 2494 /* Skip if jailed and not a valid IP of the prison. */ 2495 lltable_fill_sa_entry(lle, (struct sockaddr *)&ndpc.sin6); 2496 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&ndpc.sin6) != 0) 2497 return (0); 2498 /* 2499 * produce a msg made of: 2500 * struct rt_msghdr; 2501 * struct sockaddr_in6 (IPv6) 2502 * struct sockaddr_dl; 2503 */ 2504 ndpc.rtm.rtm_msglen = sizeof(ndpc); 2505 ndpc.rtm.rtm_version = RTM_VERSION; 2506 ndpc.rtm.rtm_type = RTM_GET; 2507 ndpc.rtm.rtm_flags = RTF_UP; 2508 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 2509 sa6_recoverscope(&ndpc.sin6); 2510 2511 /* publish */ 2512 if (lle->la_flags & LLE_PUB) 2513 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE; 2514 2515 sdl = &ndpc.sdl; 2516 sdl->sdl_family = AF_LINK; 2517 sdl->sdl_len = sizeof(*sdl); 2518 sdl->sdl_index = ifp->if_index; 2519 sdl->sdl_type = ifp->if_type; 2520 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 2521 sdl->sdl_alen = ifp->if_addrlen; 2522 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 2523 } else { 2524 sdl->sdl_alen = 0; 2525 bzero(LLADDR(sdl), ifp->if_addrlen); 2526 } 2527 if (lle->la_expire != 0) 2528 ndpc.rtm.rtm_rmx.rmx_expire = lle->la_expire + 2529 lle->lle_remtime / hz + time_second - time_uptime; 2530 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 2531 if (lle->la_flags & LLE_STATIC) 2532 ndpc.rtm.rtm_flags |= RTF_STATIC; 2533 if (lle->la_flags & LLE_IFADDR) 2534 ndpc.rtm.rtm_flags |= RTF_PINNED; 2535 if (lle->ln_router != 0) 2536 ndpc.rtm.rtm_flags |= RTF_GATEWAY; 2537 ndpc.rtm.rtm_rmx.rmx_pksent = lle->la_asked; 2538 /* Store state in rmx_weight value */ 2539 ndpc.rtm.rtm_rmx.rmx_state = lle->ln_state; 2540 ndpc.rtm.rtm_index = ifp->if_index; 2541 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc)); 2542 2543 return (error); 2544 } 2545 2546 static void 2547 in6_lltable_post_resolved(struct lltable *llt, struct llentry *lle) 2548 { 2549 /* Join the solicited multicast group for dst. */ 2550 if ((lle->la_flags & LLE_PUB) == LLE_PUB) 2551 in6_join_proxy_ndp_mc(llt->llt_ifp, &lle->r_l3addr.addr6); 2552 } 2553 2554 static struct lltable * 2555 in6_lltattach(struct ifnet *ifp) 2556 { 2557 struct lltable *llt; 2558 2559 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE); 2560 llt->llt_af = AF_INET6; 2561 llt->llt_ifp = ifp; 2562 2563 llt->llt_lookup = in6_lltable_lookup; 2564 llt->llt_alloc_entry = in6_lltable_alloc; 2565 llt->llt_delete_entry = in6_lltable_delete_entry; 2566 llt->llt_dump_entry = in6_lltable_dump_entry; 2567 llt->llt_hash = in6_lltable_hash; 2568 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry; 2569 llt->llt_free_entry = in6_lltable_free_entry; 2570 llt->llt_match_prefix = in6_lltable_match_prefix; 2571 llt->llt_mark_used = llentry_mark_used; 2572 llt->llt_post_resolved = in6_lltable_post_resolved; 2573 lltable_link(llt); 2574 2575 return (llt); 2576 } 2577 2578 struct lltable * 2579 in6_lltable_get(struct ifnet *ifp) 2580 { 2581 struct lltable *llt = NULL; 2582 2583 void *afdata_ptr = ifp->if_afdata[AF_INET6]; 2584 if (afdata_ptr != NULL) 2585 llt = ((struct in6_ifextra *)afdata_ptr)->lltable; 2586 return (llt); 2587 } 2588 2589 void * 2590 in6_domifattach(struct ifnet *ifp) 2591 { 2592 struct in6_ifextra *ext; 2593 2594 /* There are not IPv6-capable interfaces. */ 2595 switch (ifp->if_type) { 2596 case IFT_PFLOG: 2597 case IFT_PFSYNC: 2598 case IFT_USB: 2599 return (NULL); 2600 } 2601 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2602 bzero(ext, sizeof(*ext)); 2603 2604 ext->in6_ifstat = malloc(sizeof(counter_u64_t) * 2605 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK); 2606 COUNTER_ARRAY_ALLOC(ext->in6_ifstat, 2607 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK); 2608 2609 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) * 2610 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR, 2611 M_WAITOK); 2612 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat, 2613 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK); 2614 2615 ext->nd_ifinfo = nd6_ifattach(ifp); 2616 ext->scope6_id = scope6_ifattach(ifp); 2617 ext->lltable = in6_lltattach(ifp); 2618 2619 ext->mld_ifinfo = mld_domifattach(ifp); 2620 2621 return ext; 2622 } 2623 2624 int 2625 in6_domifmtu(struct ifnet *ifp) 2626 { 2627 if (ifp->if_afdata[AF_INET6] == NULL) 2628 return ifp->if_mtu; 2629 2630 return (IN6_LINKMTU(ifp)); 2631 } 2632 2633 void 2634 in6_domifdetach(struct ifnet *ifp, void *aux) 2635 { 2636 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2637 2638 mld_domifdetach(ifp); 2639 scope6_ifdetach(ext->scope6_id); 2640 nd6_ifdetach(ifp, ext->nd_ifinfo); 2641 lltable_free(ext->lltable); 2642 COUNTER_ARRAY_FREE(ext->in6_ifstat, 2643 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 2644 free(ext->in6_ifstat, M_IFADDR); 2645 COUNTER_ARRAY_FREE(ext->icmp6_ifstat, 2646 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 2647 free(ext->icmp6_ifstat, M_IFADDR); 2648 free(ext, M_IFADDR); 2649 } 2650 2651 /* 2652 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2653 * v4 mapped addr or v4 compat addr 2654 */ 2655 void 2656 in6_sin6_2_sin(struct sockaddr_in *sin, const struct sockaddr_in6 *sin6) 2657 { 2658 2659 bzero(sin, sizeof(*sin)); 2660 sin->sin_len = sizeof(struct sockaddr_in); 2661 sin->sin_family = AF_INET; 2662 sin->sin_port = sin6->sin6_port; 2663 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2664 } 2665 2666 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2667 void 2668 in6_sin_2_v4mapsin6(const struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2669 { 2670 bzero(sin6, sizeof(*sin6)); 2671 sin6->sin6_len = sizeof(struct sockaddr_in6); 2672 sin6->sin6_family = AF_INET6; 2673 sin6->sin6_port = sin->sin_port; 2674 sin6->sin6_addr.s6_addr32[0] = 0; 2675 sin6->sin6_addr.s6_addr32[1] = 0; 2676 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2677 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2678 } 2679 2680 /* Convert sockaddr_in6 into sockaddr_in. */ 2681 void 2682 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2683 { 2684 struct sockaddr_in *sin_p; 2685 struct sockaddr_in6 sin6; 2686 2687 /* 2688 * Save original sockaddr_in6 addr and convert it 2689 * to sockaddr_in. 2690 */ 2691 sin6 = *(struct sockaddr_in6 *)nam; 2692 sin_p = (struct sockaddr_in *)nam; 2693 in6_sin6_2_sin(sin_p, &sin6); 2694 } 2695 2696 /* 2697 * Join/leave the solicited multicast groups for proxy NDP entries. 2698 */ 2699 static void 2700 in6_join_proxy_ndp_mc(struct ifnet *ifp, const struct in6_addr *dst) 2701 { 2702 struct in6_multi *inm; 2703 struct in6_addr mltaddr; 2704 char ip6buf[INET6_ADDRSTRLEN]; 2705 int error; 2706 2707 if (in6_solicited_node_maddr(&mltaddr, ifp, dst) != 0) 2708 return; /* error logged in in6_solicited_node_maddr. */ 2709 2710 error = in6_joingroup(ifp, &mltaddr, NULL, &inm, 0); 2711 if (error != 0) { 2712 nd6log((LOG_WARNING, 2713 "%s: in6_joingroup failed for %s on %s (errno=%d)\n", 2714 __func__, ip6_sprintf(ip6buf, &mltaddr), if_name(ifp), 2715 error)); 2716 } 2717 } 2718 2719 static void 2720 in6_leave_proxy_ndp_mc(struct ifnet *ifp, const struct in6_addr *dst) 2721 { 2722 struct epoch_tracker et; 2723 struct in6_multi *inm; 2724 struct in6_addr mltaddr; 2725 char ip6buf[INET6_ADDRSTRLEN]; 2726 2727 if (in6_solicited_node_maddr(&mltaddr, ifp, dst) != 0) 2728 return; /* error logged in in6_solicited_node_maddr. */ 2729 2730 NET_EPOCH_ENTER(et); 2731 inm = in6m_lookup(ifp, &mltaddr); 2732 NET_EPOCH_EXIT(et); 2733 if (inm != NULL) 2734 in6_leavegroup(inm, NULL); 2735 else 2736 nd6log((LOG_WARNING, "%s: in6m_lookup failed for %s on %s\n", 2737 __func__, ip6_sprintf(ip6buf, &mltaddr), if_name(ifp))); 2738 } 2739 2740 static bool 2741 in6_lle_match_pub(struct lltable *llt, struct llentry *lle, void *farg) 2742 { 2743 return ((lle->la_flags & LLE_PUB) != 0); 2744 } 2745 2746 void 2747 in6_purge_proxy_ndp(struct ifnet *ifp) 2748 { 2749 struct lltable *llt; 2750 bool need_purge; 2751 2752 if (ifp->if_afdata[AF_INET6] == NULL) 2753 return; 2754 2755 llt = LLTABLE6(ifp); 2756 IF_AFDATA_WLOCK(ifp); 2757 need_purge = ((llt->llt_flags & LLT_ADDEDPROXY) != 0); 2758 IF_AFDATA_WUNLOCK(ifp); 2759 2760 /* 2761 * Ever added proxy ndp entries, leave solicited node multicast 2762 * before deleting the llentry. 2763 */ 2764 if (need_purge) 2765 lltable_delete_conditional(llt, in6_lle_match_pub, NULL); 2766 } 2767