1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $ 32 */ 33 34 /*- 35 * Copyright (c) 1982, 1986, 1991, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * @(#)in.c 8.2 (Berkeley) 11/15/93 63 */ 64 65 #include <sys/cdefs.h> 66 __FBSDID("$FreeBSD$"); 67 68 #include "opt_inet.h" 69 #include "opt_inet6.h" 70 71 #include <sys/param.h> 72 #include <sys/eventhandler.h> 73 #include <sys/errno.h> 74 #include <sys/jail.h> 75 #include <sys/malloc.h> 76 #include <sys/socket.h> 77 #include <sys/socketvar.h> 78 #include <sys/sockio.h> 79 #include <sys/systm.h> 80 #include <sys/priv.h> 81 #include <sys/proc.h> 82 #include <sys/time.h> 83 #include <sys/kernel.h> 84 #include <sys/lock.h> 85 #include <sys/rmlock.h> 86 #include <sys/sysctl.h> 87 #include <sys/syslog.h> 88 89 #include <net/if.h> 90 #include <net/if_var.h> 91 #include <net/if_private.h> 92 #include <net/if_types.h> 93 #include <net/route.h> 94 #include <net/route/route_ctl.h> 95 #include <net/route/nhop.h> 96 #include <net/if_dl.h> 97 #include <net/vnet.h> 98 99 #include <netinet/in.h> 100 #include <netinet/in_var.h> 101 #include <net/if_llatbl.h> 102 #include <netinet/if_ether.h> 103 #include <netinet/in_systm.h> 104 #include <netinet/ip.h> 105 #include <netinet/in_pcb.h> 106 #include <netinet/ip_carp.h> 107 108 #include <netinet/ip6.h> 109 #include <netinet6/ip6_var.h> 110 #include <netinet6/nd6.h> 111 #include <netinet6/mld6_var.h> 112 #include <netinet6/ip6_mroute.h> 113 #include <netinet6/in6_ifattach.h> 114 #include <netinet6/scope6_var.h> 115 #include <netinet6/in6_fib.h> 116 #include <netinet6/in6_pcb.h> 117 118 #ifdef MAC 119 #include <security/mac/mac_framework.h> 120 #endif 121 122 /* 123 * struct in6_ifreq and struct ifreq must be type punnable for common members 124 * of ifr_ifru to allow accessors to be shared. 125 */ 126 _Static_assert(offsetof(struct in6_ifreq, ifr_ifru) == 127 offsetof(struct ifreq, ifr_ifru), 128 "struct in6_ifreq and struct ifreq are not type punnable"); 129 130 VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix); 131 #define V_icmp6_nodeinfo_oldmcprefix VNET(icmp6_nodeinfo_oldmcprefix) 132 133 /* 134 * Definitions of some costant IP6 addresses. 135 */ 136 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 137 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 138 const struct in6_addr in6addr_nodelocal_allnodes = 139 IN6ADDR_NODELOCAL_ALLNODES_INIT; 140 const struct in6_addr in6addr_linklocal_allnodes = 141 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 142 const struct in6_addr in6addr_linklocal_allrouters = 143 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 144 const struct in6_addr in6addr_linklocal_allv2routers = 145 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT; 146 147 const struct in6_addr in6mask0 = IN6MASK0; 148 const struct in6_addr in6mask32 = IN6MASK32; 149 const struct in6_addr in6mask64 = IN6MASK64; 150 const struct in6_addr in6mask96 = IN6MASK96; 151 const struct in6_addr in6mask128 = IN6MASK128; 152 153 const struct sockaddr_in6 sa6_any = 154 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 }; 155 156 static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *, 157 struct in6_aliasreq *, int); 158 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 159 160 static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *, 161 struct in6_ifaddr *, int); 162 static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *, 163 struct in6_aliasreq *, int flags); 164 static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *, 165 struct in6_ifaddr *, int, int); 166 static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *, 167 struct in6_ifaddr *, int); 168 169 static void in6_join_proxy_ndp_mc(struct ifnet *, const struct in6_addr *); 170 static void in6_leave_proxy_ndp_mc(struct ifnet *, const struct in6_addr *); 171 172 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 173 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 174 175 static struct sx in6_control_sx; 176 SX_SYSINIT(in6_control_sx, &in6_control_sx, "in6_control"); 177 178 void 179 in6_newaddrmsg(struct in6_ifaddr *ia, int cmd) 180 { 181 struct rt_addrinfo info; 182 struct ifaddr *ifa; 183 struct sockaddr_dl gateway; 184 int fibnum; 185 186 ifa = &ia->ia_ifa; 187 188 /* 189 * Prepare info data for the host route. 190 * This code mimics one from ifa_maintain_loopback_route(). 191 */ 192 bzero(&info, sizeof(struct rt_addrinfo)); 193 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED; 194 info.rti_info[RTAX_DST] = ifa->ifa_addr; 195 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&gateway; 196 link_init_sdl(ifa->ifa_ifp, (struct sockaddr *)&gateway, ifa->ifa_ifp->if_type); 197 if (cmd != RTM_DELETE) 198 info.rti_ifp = V_loif; 199 200 fibnum = ia62ifa(ia)->ifa_ifp->if_fib; 201 202 if (cmd == RTM_ADD) { 203 rt_addrmsg(cmd, &ia->ia_ifa, fibnum); 204 rt_routemsg_info(cmd, &info, fibnum); 205 } else if (cmd == RTM_DELETE) { 206 rt_routemsg_info(cmd, &info, fibnum); 207 rt_addrmsg(cmd, &ia->ia_ifa, fibnum); 208 } 209 } 210 211 int 212 in6_mask2len(struct in6_addr *mask, u_char *lim0) 213 { 214 int x = 0, y; 215 u_char *lim = lim0, *p; 216 217 /* ignore the scope_id part */ 218 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 219 lim = (u_char *)mask + sizeof(*mask); 220 for (p = (u_char *)mask; p < lim; x++, p++) { 221 if (*p != 0xff) 222 break; 223 } 224 y = 0; 225 if (p < lim) { 226 for (y = 0; y < 8; y++) { 227 if ((*p & (0x80 >> y)) == 0) 228 break; 229 } 230 } 231 232 /* 233 * when the limit pointer is given, do a stricter check on the 234 * remaining bits. 235 */ 236 if (p < lim) { 237 if (y != 0 && (*p & (0x00ff >> y)) != 0) 238 return (-1); 239 for (p = p + 1; p < lim; p++) 240 if (*p != 0) 241 return (-1); 242 } 243 244 return x * 8 + y; 245 } 246 247 #ifdef COMPAT_FREEBSD32 248 struct in6_ndifreq32 { 249 char ifname[IFNAMSIZ]; 250 uint32_t ifindex; 251 }; 252 #define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32) 253 #endif 254 255 int 256 in6_control_ioctl(u_long cmd, void *data, 257 struct ifnet *ifp, struct ucred *cred) 258 { 259 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 260 struct in6_ifaddr *ia = NULL; 261 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 262 struct sockaddr_in6 *sa6; 263 int error; 264 bool control_locked = false; 265 266 /* 267 * Compat to make pre-10.x ifconfig(8) operable. 268 */ 269 if (cmd == OSIOCAIFADDR_IN6) { 270 cmd = SIOCAIFADDR_IN6; 271 ifra->ifra_vhid = 0; 272 } 273 274 switch (cmd) { 275 case SIOCGETSGCNT_IN6: 276 case SIOCGETMIFCNT_IN6: 277 /* 278 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c. 279 * We cannot see how that would be needed, so do not adjust the 280 * KPI blindly; more likely should clean up the IPv4 variant. 281 */ 282 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP); 283 } 284 285 switch (cmd) { 286 case SIOCAADDRCTL_POLICY: 287 case SIOCDADDRCTL_POLICY: 288 if (cred != NULL) { 289 error = priv_check_cred(cred, PRIV_NETINET_ADDRCTRL6); 290 if (error) 291 return (error); 292 } 293 return (in6_src_ioctl(cmd, data)); 294 } 295 296 if (ifp == NULL) 297 return (EOPNOTSUPP); 298 299 switch (cmd) { 300 case SIOCSNDFLUSH_IN6: 301 case SIOCSPFXFLUSH_IN6: 302 case SIOCSRTRFLUSH_IN6: 303 case SIOCSDEFIFACE_IN6: 304 case SIOCSIFINFO_FLAGS: 305 case SIOCSIFINFO_IN6: 306 if (cred != NULL) { 307 error = priv_check_cred(cred, PRIV_NETINET_ND6); 308 if (error) 309 return (error); 310 } 311 /* FALLTHROUGH */ 312 case OSIOCGIFINFO_IN6: 313 case SIOCGIFINFO_IN6: 314 case SIOCGNBRINFO_IN6: 315 case SIOCGDEFIFACE_IN6: 316 return (nd6_ioctl(cmd, data, ifp)); 317 318 #ifdef COMPAT_FREEBSD32 319 case SIOCGDEFIFACE32_IN6: 320 { 321 struct in6_ndifreq ndif; 322 struct in6_ndifreq32 *ndif32; 323 324 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif, 325 ifp); 326 if (error) 327 return (error); 328 ndif32 = (struct in6_ndifreq32 *)data; 329 ndif32->ifindex = ndif.ifindex; 330 return (0); 331 } 332 #endif 333 } 334 335 switch (cmd) { 336 case SIOCSIFPREFIX_IN6: 337 case SIOCDIFPREFIX_IN6: 338 case SIOCAIFPREFIX_IN6: 339 case SIOCCIFPREFIX_IN6: 340 case SIOCSGIFPREFIX_IN6: 341 case SIOCGIFPREFIX_IN6: 342 log(LOG_NOTICE, 343 "prefix ioctls are now invalidated. " 344 "please use ifconfig.\n"); 345 return (EOPNOTSUPP); 346 } 347 348 switch (cmd) { 349 case SIOCSSCOPE6: 350 if (cred != NULL) { 351 error = priv_check_cred(cred, PRIV_NETINET_SCOPE6); 352 if (error) 353 return (error); 354 } 355 /* FALLTHROUGH */ 356 case SIOCGSCOPE6: 357 case SIOCGSCOPE6DEF: 358 return (scope6_ioctl(cmd, data, ifp)); 359 } 360 361 /* 362 * Find address for this interface, if it exists. 363 * 364 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 365 * only, and used the first interface address as the target of other 366 * operations (without checking ifra_addr). This was because netinet 367 * code/API assumed at most 1 interface address per interface. 368 * Since IPv6 allows a node to assign multiple addresses 369 * on a single interface, we almost always look and check the 370 * presence of ifra_addr, and reject invalid ones here. 371 * It also decreases duplicated code among SIOC*_IN6 operations. 372 */ 373 switch (cmd) { 374 case SIOCAIFADDR_IN6: 375 case SIOCSIFPHYADDR_IN6: 376 sa6 = &ifra->ifra_addr; 377 break; 378 case SIOCSIFADDR_IN6: 379 case SIOCGIFADDR_IN6: 380 case SIOCSIFDSTADDR_IN6: 381 case SIOCSIFNETMASK_IN6: 382 case SIOCGIFDSTADDR_IN6: 383 case SIOCGIFNETMASK_IN6: 384 case SIOCDIFADDR_IN6: 385 case SIOCGIFPSRCADDR_IN6: 386 case SIOCGIFPDSTADDR_IN6: 387 case SIOCGIFAFLAG_IN6: 388 case SIOCSNDFLUSH_IN6: 389 case SIOCSPFXFLUSH_IN6: 390 case SIOCSRTRFLUSH_IN6: 391 case SIOCGIFALIFETIME_IN6: 392 case SIOCGIFSTAT_IN6: 393 case SIOCGIFSTAT_ICMP6: 394 sa6 = &ifr->ifr_addr; 395 break; 396 case SIOCSIFADDR: 397 case SIOCSIFBRDADDR: 398 case SIOCSIFDSTADDR: 399 case SIOCSIFNETMASK: 400 /* 401 * Although we should pass any non-INET6 ioctl requests 402 * down to driver, we filter some legacy INET requests. 403 * Drivers trust SIOCSIFADDR et al to come from an already 404 * privileged layer, and do not perform any credentials 405 * checks or input validation. 406 */ 407 return (EINVAL); 408 default: 409 sa6 = NULL; 410 break; 411 } 412 if (sa6 && sa6->sin6_family == AF_INET6) { 413 if (sa6->sin6_scope_id != 0) 414 error = sa6_embedscope(sa6, 0); 415 else 416 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 417 if (error != 0) 418 return (error); 419 if (cred != NULL && (error = prison_check_ip6(cred, 420 &sa6->sin6_addr)) != 0) 421 return (error); 422 sx_xlock(&in6_control_sx); 423 control_locked = true; 424 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 425 } else 426 ia = NULL; 427 428 switch (cmd) { 429 case SIOCSIFADDR_IN6: 430 case SIOCSIFDSTADDR_IN6: 431 case SIOCSIFNETMASK_IN6: 432 /* 433 * Since IPv6 allows a node to assign multiple addresses 434 * on a single interface, SIOCSIFxxx ioctls are deprecated. 435 */ 436 /* we decided to obsolete this command (20000704) */ 437 error = EINVAL; 438 goto out; 439 440 case SIOCDIFADDR_IN6: 441 /* 442 * for IPv4, we look for existing in_ifaddr here to allow 443 * "ifconfig if0 delete" to remove the first IPv4 address on 444 * the interface. For IPv6, as the spec allows multiple 445 * interface address from the day one, we consider "remove the 446 * first one" semantics to be not preferable. 447 */ 448 if (ia == NULL) { 449 error = EADDRNOTAVAIL; 450 goto out; 451 } 452 /* FALLTHROUGH */ 453 case SIOCAIFADDR_IN6: 454 /* 455 * We always require users to specify a valid IPv6 address for 456 * the corresponding operation. 457 */ 458 if (ifra->ifra_addr.sin6_family != AF_INET6 || 459 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 460 error = EAFNOSUPPORT; 461 goto out; 462 } 463 464 if (cred != NULL) { 465 error = priv_check_cred(cred, (cmd == SIOCDIFADDR_IN6) ? 466 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR); 467 if (error) 468 goto out; 469 } 470 /* FALLTHROUGH */ 471 case SIOCGIFSTAT_IN6: 472 case SIOCGIFSTAT_ICMP6: 473 if (ifp->if_afdata[AF_INET6] == NULL) { 474 error = EPFNOSUPPORT; 475 goto out; 476 } 477 break; 478 479 case SIOCGIFADDR_IN6: 480 /* This interface is basically deprecated. use SIOCGIFCONF. */ 481 /* FALLTHROUGH */ 482 case SIOCGIFAFLAG_IN6: 483 case SIOCGIFNETMASK_IN6: 484 case SIOCGIFDSTADDR_IN6: 485 case SIOCGIFALIFETIME_IN6: 486 /* must think again about its semantics */ 487 if (ia == NULL) { 488 error = EADDRNOTAVAIL; 489 goto out; 490 } 491 break; 492 } 493 494 switch (cmd) { 495 case SIOCGIFADDR_IN6: 496 ifr->ifr_addr = ia->ia_addr; 497 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 498 goto out; 499 break; 500 501 case SIOCGIFDSTADDR_IN6: 502 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 503 error = EINVAL; 504 goto out; 505 } 506 ifr->ifr_dstaddr = ia->ia_dstaddr; 507 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 508 goto out; 509 break; 510 511 case SIOCGIFNETMASK_IN6: 512 ifr->ifr_addr = ia->ia_prefixmask; 513 break; 514 515 case SIOCGIFAFLAG_IN6: 516 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 517 break; 518 519 case SIOCGIFSTAT_IN6: 520 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 521 ifp->if_afdata[AF_INET6])->in6_ifstat, 522 &ifr->ifr_ifru.ifru_stat, 523 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 524 break; 525 526 case SIOCGIFSTAT_ICMP6: 527 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 528 ifp->if_afdata[AF_INET6])->icmp6_ifstat, 529 &ifr->ifr_ifru.ifru_icmp6stat, 530 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 531 break; 532 533 case SIOCGIFALIFETIME_IN6: 534 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 535 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 536 time_t maxexpire; 537 struct in6_addrlifetime *retlt = 538 &ifr->ifr_ifru.ifru_lifetime; 539 540 /* 541 * XXX: adjust expiration time assuming time_t is 542 * signed. 543 */ 544 maxexpire = (-1) & 545 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 546 if (ia->ia6_lifetime.ia6t_vltime < 547 maxexpire - ia->ia6_updatetime) { 548 retlt->ia6t_expire = ia->ia6_updatetime + 549 ia->ia6_lifetime.ia6t_vltime; 550 } else 551 retlt->ia6t_expire = maxexpire; 552 } 553 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 554 time_t maxexpire; 555 struct in6_addrlifetime *retlt = 556 &ifr->ifr_ifru.ifru_lifetime; 557 558 /* 559 * XXX: adjust expiration time assuming time_t is 560 * signed. 561 */ 562 maxexpire = (-1) & 563 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 564 if (ia->ia6_lifetime.ia6t_pltime < 565 maxexpire - ia->ia6_updatetime) { 566 retlt->ia6t_preferred = ia->ia6_updatetime + 567 ia->ia6_lifetime.ia6t_pltime; 568 } else 569 retlt->ia6t_preferred = maxexpire; 570 } 571 break; 572 573 case SIOCAIFADDR_IN6: 574 #ifdef MAC 575 /* Check if a MAC policy disallows setting the IPv6 address. */ 576 error = mac_inet6_check_add_addr(cred, &sa6->sin6_addr, ifp); 577 if (error != 0) 578 goto out; 579 #endif 580 error = in6_addifaddr(ifp, ifra, ia); 581 ia = NULL; 582 break; 583 584 case SIOCDIFADDR_IN6: 585 in6_purgeifaddr(ia); 586 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa, 587 IFADDR_EVENT_DEL); 588 break; 589 590 default: 591 if (ifp->if_ioctl == NULL) { 592 error = EOPNOTSUPP; 593 goto out; 594 } 595 error = (*ifp->if_ioctl)(ifp, cmd, data); 596 goto out; 597 } 598 599 error = 0; 600 out: 601 if (control_locked) 602 sx_xunlock(&in6_control_sx); 603 604 if (ia != NULL) 605 ifa_free(&ia->ia_ifa); 606 return (error); 607 } 608 609 int 610 in6_control(struct socket *so, u_long cmd, void *data, 611 struct ifnet *ifp, struct thread *td) 612 { 613 return (in6_control_ioctl(cmd, data, ifp, td ? td->td_ucred : NULL)); 614 } 615 616 static struct in6_multi_mship * 617 in6_joingroup_legacy(struct ifnet *ifp, const struct in6_addr *mcaddr, 618 int *errorp, int delay) 619 { 620 struct in6_multi_mship *imm; 621 int error; 622 623 imm = malloc(sizeof(*imm), M_IP6MADDR, M_NOWAIT); 624 if (imm == NULL) { 625 *errorp = ENOBUFS; 626 return (NULL); 627 } 628 629 delay = (delay * MLD_FASTHZ) / hz; 630 631 error = in6_joingroup(ifp, mcaddr, NULL, &imm->i6mm_maddr, delay); 632 if (error) { 633 *errorp = error; 634 free(imm, M_IP6MADDR); 635 return (NULL); 636 } 637 638 return (imm); 639 } 640 641 static int 642 in6_solicited_node_maddr(struct in6_addr *maddr, 643 struct ifnet *ifp, const struct in6_addr *base) 644 { 645 int error; 646 647 bzero(maddr, sizeof(struct in6_addr)); 648 maddr->s6_addr32[0] = IPV6_ADDR_INT32_MLL; 649 maddr->s6_addr32[2] = htonl(1); 650 maddr->s6_addr32[3] = base->s6_addr32[3]; 651 maddr->s6_addr8[12] = 0xff; 652 if ((error = in6_setscope(maddr, ifp, NULL)) != 0) { 653 /* XXX: should not happen */ 654 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 655 } 656 657 return error; 658 } 659 660 /* 661 * Join necessary multicast groups. Factored out from in6_update_ifa(). 662 * This entire work should only be done once, for the default FIB. 663 */ 664 static int 665 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra, 666 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol) 667 { 668 char ip6buf[INET6_ADDRSTRLEN]; 669 struct in6_addr mltaddr; 670 struct in6_multi_mship *imm; 671 int delay, error; 672 673 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__)); 674 675 /* Join solicited multicast addr for new host id. */ 676 if ((error = in6_solicited_node_maddr(&mltaddr, ifp, 677 &ifra->ifra_addr.sin6_addr)) != 0) 678 goto cleanup; 679 delay = error = 0; 680 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 681 /* 682 * We need a random delay for DAD on the address being 683 * configured. It also means delaying transmission of the 684 * corresponding MLD report to avoid report collision. 685 * [RFC 4861, Section 6.3.7] 686 */ 687 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 688 } 689 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay); 690 if (imm == NULL) { 691 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 692 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 693 if_name(ifp), error)); 694 goto cleanup; 695 } 696 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 697 *in6m_sol = imm->i6mm_maddr; 698 699 /* 700 * Join link-local all-nodes address. 701 */ 702 mltaddr = in6addr_linklocal_allnodes; 703 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 704 goto cleanup; /* XXX: should not fail */ 705 706 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, 0); 707 if (imm == NULL) { 708 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 709 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 710 if_name(ifp), error)); 711 goto cleanup; 712 } 713 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 714 715 /* 716 * Join node information group address. 717 */ 718 delay = 0; 719 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 720 /* 721 * The spec does not say anything about delay for this group, 722 * but the same logic should apply. 723 */ 724 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 725 } 726 if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) { 727 /* XXX jinmei */ 728 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay); 729 if (imm == NULL) 730 nd6log((LOG_WARNING, 731 "%s: in6_joingroup failed for %s on %s " 732 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 733 &mltaddr), if_name(ifp), error)); 734 /* XXX not very fatal, go on... */ 735 else 736 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 737 } 738 if (V_icmp6_nodeinfo_oldmcprefix && 739 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) { 740 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay); 741 if (imm == NULL) 742 nd6log((LOG_WARNING, 743 "%s: in6_joingroup failed for %s on %s " 744 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 745 &mltaddr), if_name(ifp), error)); 746 /* XXX not very fatal, go on... */ 747 else 748 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 749 } 750 751 /* 752 * Join interface-local all-nodes address. 753 * (ff01::1%ifN, and ff01::%ifN/32) 754 */ 755 mltaddr = in6addr_nodelocal_allnodes; 756 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 757 goto cleanup; /* XXX: should not fail */ 758 759 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, 0); 760 if (imm == NULL) { 761 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 762 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 763 &mltaddr), if_name(ifp), error)); 764 goto cleanup; 765 } 766 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 767 768 cleanup: 769 return (error); 770 } 771 772 /* 773 * Update parameters of an IPv6 interface address. 774 * If necessary, a new entry is created and linked into address chains. 775 * This function is separated from in6_control(). 776 */ 777 int 778 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 779 struct in6_ifaddr *ia, int flags) 780 { 781 int error, hostIsNew = 0; 782 783 if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0) 784 return (error); 785 786 if (ia == NULL) { 787 hostIsNew = 1; 788 if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL) 789 return (ENOBUFS); 790 } 791 792 error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags); 793 if (error != 0) { 794 if (hostIsNew != 0) { 795 in6_unlink_ifa(ia, ifp); 796 ifa_free(&ia->ia_ifa); 797 } 798 return (error); 799 } 800 801 if (hostIsNew) 802 error = in6_broadcast_ifa(ifp, ifra, ia, flags); 803 804 return (error); 805 } 806 807 /* 808 * Fill in basic IPv6 address request info. 809 */ 810 void 811 in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr, 812 const struct in6_addr *mask) 813 { 814 815 memset(ifra, 0, sizeof(struct in6_aliasreq)); 816 817 ifra->ifra_addr.sin6_family = AF_INET6; 818 ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 819 if (addr != NULL) 820 ifra->ifra_addr.sin6_addr = *addr; 821 822 ifra->ifra_prefixmask.sin6_family = AF_INET6; 823 ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 824 if (mask != NULL) 825 ifra->ifra_prefixmask.sin6_addr = *mask; 826 } 827 828 static int 829 in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra, 830 struct in6_ifaddr *ia, int flags) 831 { 832 int plen = -1; 833 struct sockaddr_in6 dst6; 834 struct in6_addrlifetime *lt; 835 char ip6buf[INET6_ADDRSTRLEN]; 836 837 /* Validate parameters */ 838 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 839 return (EINVAL); 840 841 /* 842 * The destination address for a p2p link must have a family 843 * of AF_UNSPEC or AF_INET6. 844 */ 845 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 846 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 847 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 848 return (EAFNOSUPPORT); 849 850 /* 851 * Validate address 852 */ 853 if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) || 854 ifra->ifra_addr.sin6_family != AF_INET6) 855 return (EINVAL); 856 857 /* 858 * validate ifra_prefixmask. don't check sin6_family, netmask 859 * does not carry fields other than sin6_len. 860 */ 861 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 862 return (EINVAL); 863 /* 864 * Because the IPv6 address architecture is classless, we require 865 * users to specify a (non 0) prefix length (mask) for a new address. 866 * We also require the prefix (when specified) mask is valid, and thus 867 * reject a non-consecutive mask. 868 */ 869 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 870 return (EINVAL); 871 if (ifra->ifra_prefixmask.sin6_len != 0) { 872 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 873 (u_char *)&ifra->ifra_prefixmask + 874 ifra->ifra_prefixmask.sin6_len); 875 if (plen <= 0) 876 return (EINVAL); 877 } else { 878 /* 879 * In this case, ia must not be NULL. We just use its prefix 880 * length. 881 */ 882 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 883 } 884 /* 885 * If the destination address on a p2p interface is specified, 886 * and the address is a scoped one, validate/set the scope 887 * zone identifier. 888 */ 889 dst6 = ifra->ifra_dstaddr; 890 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 891 (dst6.sin6_family == AF_INET6)) { 892 struct in6_addr in6_tmp; 893 u_int32_t zoneid; 894 895 in6_tmp = dst6.sin6_addr; 896 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 897 return (EINVAL); /* XXX: should be impossible */ 898 899 if (dst6.sin6_scope_id != 0) { 900 if (dst6.sin6_scope_id != zoneid) 901 return (EINVAL); 902 } else /* user omit to specify the ID. */ 903 dst6.sin6_scope_id = zoneid; 904 905 /* convert into the internal form */ 906 if (sa6_embedscope(&dst6, 0)) 907 return (EINVAL); /* XXX: should be impossible */ 908 } 909 /* Modify original ifra_dstaddr to reflect changes */ 910 ifra->ifra_dstaddr = dst6; 911 912 /* 913 * The destination address can be specified only for a p2p or a 914 * loopback interface. If specified, the corresponding prefix length 915 * must be 128. 916 */ 917 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 918 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 919 /* XXX: noisy message */ 920 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 921 "be specified for a p2p or a loopback IF only\n")); 922 return (EINVAL); 923 } 924 if (plen != 128) { 925 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 926 "be 128 when dstaddr is specified\n")); 927 return (EINVAL); 928 } 929 } 930 /* lifetime consistency check */ 931 lt = &ifra->ifra_lifetime; 932 if (lt->ia6t_pltime > lt->ia6t_vltime) 933 return (EINVAL); 934 if (lt->ia6t_vltime == 0) { 935 /* 936 * the following log might be noisy, but this is a typical 937 * configuration mistake or a tool's bug. 938 */ 939 nd6log((LOG_INFO, 940 "in6_update_ifa: valid lifetime is 0 for %s\n", 941 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr))); 942 943 if (ia == NULL) 944 return (0); /* there's nothing to do */ 945 } 946 947 /* Check prefix mask */ 948 if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) { 949 /* 950 * We prohibit changing the prefix length of an existing 951 * address, because 952 * + such an operation should be rare in IPv6, and 953 * + the operation would confuse prefix management. 954 */ 955 if (ia->ia_prefixmask.sin6_len != 0 && 956 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 957 nd6log((LOG_INFO, "in6_validate_ifa: the prefix length " 958 "of an existing %s address should not be changed\n", 959 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 960 961 return (EINVAL); 962 } 963 } 964 965 return (0); 966 } 967 968 /* 969 * Allocate a new ifaddr and link it into chains. 970 */ 971 static struct in6_ifaddr * 972 in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags) 973 { 974 struct in6_ifaddr *ia; 975 976 /* 977 * When in6_alloc_ifa() is called in a process of a received 978 * RA, it is called under an interrupt context. So, we should 979 * call malloc with M_NOWAIT. 980 */ 981 ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT); 982 if (ia == NULL) 983 return (NULL); 984 LIST_INIT(&ia->ia6_memberships); 985 /* Initialize the address and masks, and put time stamp */ 986 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 987 ia->ia_addr.sin6_family = AF_INET6; 988 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 989 /* XXX: Can we assign ,sin6_addr and skip the rest? */ 990 ia->ia_addr = ifra->ifra_addr; 991 ia->ia6_createtime = time_uptime; 992 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 993 /* 994 * Some functions expect that ifa_dstaddr is not 995 * NULL for p2p interfaces. 996 */ 997 ia->ia_ifa.ifa_dstaddr = 998 (struct sockaddr *)&ia->ia_dstaddr; 999 } else { 1000 ia->ia_ifa.ifa_dstaddr = NULL; 1001 } 1002 1003 /* set prefix mask if any */ 1004 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 1005 if (ifra->ifra_prefixmask.sin6_len != 0) { 1006 ia->ia_prefixmask.sin6_family = AF_INET6; 1007 ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len; 1008 ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr; 1009 } 1010 1011 ia->ia_ifp = ifp; 1012 ifa_ref(&ia->ia_ifa); /* if_addrhead */ 1013 IF_ADDR_WLOCK(ifp); 1014 CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1015 IF_ADDR_WUNLOCK(ifp); 1016 1017 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */ 1018 IN6_IFADDR_WLOCK(); 1019 CK_STAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link); 1020 CK_LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash); 1021 IN6_IFADDR_WUNLOCK(); 1022 1023 return (ia); 1024 } 1025 1026 /* 1027 * Update/configure interface address parameters: 1028 * 1029 * 1) Update lifetime 1030 * 2) Update interface metric ad flags 1031 * 3) Notify other subsystems 1032 */ 1033 static int 1034 in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra, 1035 struct in6_ifaddr *ia, int hostIsNew, int flags) 1036 { 1037 int error; 1038 1039 /* update timestamp */ 1040 ia->ia6_updatetime = time_uptime; 1041 1042 /* 1043 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1044 * to see if the address is deprecated or invalidated, but initialize 1045 * these members for applications. 1046 */ 1047 ia->ia6_lifetime = ifra->ifra_lifetime; 1048 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1049 ia->ia6_lifetime.ia6t_expire = 1050 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1051 } else 1052 ia->ia6_lifetime.ia6t_expire = 0; 1053 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1054 ia->ia6_lifetime.ia6t_preferred = 1055 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1056 } else 1057 ia->ia6_lifetime.ia6t_preferred = 0; 1058 1059 /* 1060 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1061 * userland, make it deprecated. 1062 */ 1063 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1064 ia->ia6_lifetime.ia6t_pltime = 0; 1065 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1066 } 1067 1068 /* 1069 * configure address flags. 1070 */ 1071 ia->ia6_flags = ifra->ifra_flags; 1072 1073 /* 1074 * Make the address tentative before joining multicast addresses, 1075 * so that corresponding MLD responses would not have a tentative 1076 * source address. 1077 */ 1078 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1079 1080 /* 1081 * DAD should be performed for an new address or addresses on 1082 * an interface with ND6_IFF_IFDISABLED. 1083 */ 1084 if (in6if_do_dad(ifp) && 1085 (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED))) 1086 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1087 1088 /* notify other subsystems */ 1089 error = in6_notify_ifa(ifp, ia, ifra, hostIsNew); 1090 1091 return (error); 1092 } 1093 1094 /* 1095 * Do link-level ifa job: 1096 * 1) Add lle entry for added address 1097 * 2) Notifies routing socket users about new address 1098 * 3) join appropriate multicast group 1099 * 4) start DAD if enabled 1100 */ 1101 static int 1102 in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1103 struct in6_ifaddr *ia, int flags) 1104 { 1105 struct in6_multi *in6m_sol; 1106 int error = 0; 1107 1108 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1109 if ((error = nd6_add_ifa_lle(ia)) != 0) { 1110 in6_purgeaddr(&ia->ia_ifa); 1111 ifa_free(&ia->ia_ifa); 1112 return (error); 1113 } 1114 1115 /* Join necessary multicast groups. */ 1116 in6m_sol = NULL; 1117 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1118 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol); 1119 if (error != 0) { 1120 in6_purgeaddr(&ia->ia_ifa); 1121 ifa_free(&ia->ia_ifa); 1122 return (error); 1123 } 1124 } 1125 1126 /* Perform DAD, if the address is TENTATIVE. */ 1127 if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) { 1128 int delay, mindelay, maxdelay; 1129 1130 delay = 0; 1131 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1132 /* 1133 * We need to impose a delay before sending an NS 1134 * for DAD. Check if we also needed a delay for the 1135 * corresponding MLD message. If we did, the delay 1136 * should be larger than the MLD delay (this could be 1137 * relaxed a bit, but this simple logic is at least 1138 * safe). 1139 * XXX: Break data hiding guidelines and look at 1140 * state for the solicited multicast group. 1141 */ 1142 mindelay = 0; 1143 if (in6m_sol != NULL && 1144 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) { 1145 mindelay = in6m_sol->in6m_timer; 1146 } 1147 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1148 if (maxdelay - mindelay == 0) 1149 delay = 0; 1150 else { 1151 delay = 1152 (arc4random() % (maxdelay - mindelay)) + 1153 mindelay; 1154 } 1155 } 1156 nd6_dad_start((struct ifaddr *)ia, delay); 1157 } 1158 1159 in6_newaddrmsg(ia, RTM_ADD); 1160 ifa_free(&ia->ia_ifa); 1161 return (error); 1162 } 1163 1164 /* 1165 * Adds or deletes interface route for p2p ifa. 1166 * Returns 0 on success or errno. 1167 */ 1168 static int 1169 in6_handle_dstaddr_rtrequest(int cmd, struct in6_ifaddr *ia) 1170 { 1171 struct epoch_tracker et; 1172 struct ifaddr *ifa = &ia->ia_ifa; 1173 int error; 1174 1175 /* Prepare gateway */ 1176 struct sockaddr_dl_short sdl = { 1177 .sdl_family = AF_LINK, 1178 .sdl_len = sizeof(struct sockaddr_dl_short), 1179 .sdl_type = ifa->ifa_ifp->if_type, 1180 .sdl_index = ifa->ifa_ifp->if_index, 1181 }; 1182 1183 struct sockaddr_in6 dst = { 1184 .sin6_family = AF_INET6, 1185 .sin6_len = sizeof(struct sockaddr_in6), 1186 .sin6_addr = ia->ia_dstaddr.sin6_addr, 1187 }; 1188 1189 struct rt_addrinfo info = { 1190 .rti_ifa = ifa, 1191 .rti_ifp = ifa->ifa_ifp, 1192 .rti_flags = RTF_PINNED | RTF_HOST, 1193 .rti_info = { 1194 [RTAX_DST] = (struct sockaddr *)&dst, 1195 [RTAX_GATEWAY] = (struct sockaddr *)&sdl, 1196 }, 1197 }; 1198 /* Don't set additional per-gw filters on removal */ 1199 1200 NET_EPOCH_ENTER(et); 1201 error = rib_handle_ifaddr_info(ifa->ifa_ifp->if_fib, cmd, &info); 1202 NET_EPOCH_EXIT(et); 1203 1204 return (error); 1205 } 1206 1207 static bool 1208 ifa_is_p2p(struct in6_ifaddr *ia) 1209 { 1210 int plen; 1211 1212 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1213 1214 if ((plen == 128) && (ia->ia_dstaddr.sin6_family == AF_INET6) && 1215 !IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &ia->ia_dstaddr.sin6_addr)) 1216 return (true); 1217 1218 return (false); 1219 } 1220 1221 int 1222 in6_addifaddr(struct ifnet *ifp, struct in6_aliasreq *ifra, struct in6_ifaddr *ia) 1223 { 1224 struct nd_prefixctl pr0; 1225 struct nd_prefix *pr; 1226 int carp_attached = 0; 1227 int error; 1228 1229 /* 1230 * first, make or update the interface address structure, 1231 * and link it to the list. 1232 */ 1233 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 1234 goto out; 1235 if (ia != NULL) { 1236 if (ia->ia_ifa.ifa_carp) 1237 (*carp_detach_p)(&ia->ia_ifa, true); 1238 ifa_free(&ia->ia_ifa); 1239 } 1240 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) == NULL) { 1241 /* 1242 * this can happen when the user specify the 0 valid 1243 * lifetime. 1244 */ 1245 return (0); 1246 } 1247 1248 if (ifra->ifra_vhid > 0) { 1249 if (carp_attach_p != NULL) 1250 error = (*carp_attach_p)(&ia->ia_ifa, 1251 ifra->ifra_vhid); 1252 else 1253 error = EPROTONOSUPPORT; 1254 if (error) 1255 goto out; 1256 else 1257 carp_attached = 1; 1258 } 1259 1260 /* 1261 * then, make the prefix on-link on the interface. 1262 * XXX: we'd rather create the prefix before the address, but 1263 * we need at least one address to install the corresponding 1264 * interface route, so we configure the address first. 1265 */ 1266 1267 /* 1268 * convert mask to prefix length (prefixmask has already 1269 * been validated in in6_update_ifa(). 1270 */ 1271 bzero(&pr0, sizeof(pr0)); 1272 pr0.ndpr_ifp = ifp; 1273 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 1274 NULL); 1275 if (pr0.ndpr_plen == 128) { 1276 /* we don't need to install a host route. */ 1277 goto aifaddr_out; 1278 } 1279 pr0.ndpr_prefix = ifra->ifra_addr; 1280 /* apply the mask for safety. */ 1281 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, 1282 &ifra->ifra_prefixmask.sin6_addr); 1283 1284 /* 1285 * XXX: since we don't have an API to set prefix (not address) 1286 * lifetimes, we just use the same lifetimes as addresses. 1287 * The (temporarily) installed lifetimes can be overridden by 1288 * later advertised RAs (when accept_rtadv is non 0), which is 1289 * an intended behavior. 1290 */ 1291 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 1292 pr0.ndpr_raf_auto = 1293 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 1294 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 1295 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 1296 1297 /* add the prefix if not yet. */ 1298 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 1299 /* 1300 * nd6_prelist_add will install the corresponding 1301 * interface route. 1302 */ 1303 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) { 1304 if (carp_attached) 1305 (*carp_detach_p)(&ia->ia_ifa, false); 1306 goto out; 1307 } 1308 } 1309 1310 /* relate the address to the prefix */ 1311 if (ia->ia6_ndpr == NULL) { 1312 ia->ia6_ndpr = pr; 1313 pr->ndpr_addrcnt++; 1314 1315 /* 1316 * If this is the first autoconf address from the 1317 * prefix, create a temporary address as well 1318 * (when required). 1319 */ 1320 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 1321 V_ip6_use_tempaddr && pr->ndpr_addrcnt == 1) { 1322 int e; 1323 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 1324 log(LOG_NOTICE, "in6_control: failed " 1325 "to create a temporary address, " 1326 "errno=%d\n", e); 1327 } 1328 } 1329 } 1330 nd6_prefix_rele(pr); 1331 1332 /* 1333 * this might affect the status of autoconfigured addresses, 1334 * that is, this address might make other addresses detached. 1335 */ 1336 pfxlist_onlink_check(); 1337 1338 aifaddr_out: 1339 /* 1340 * Try to clear the flag when a new IPv6 address is added 1341 * onto an IFDISABLED interface and it succeeds. 1342 */ 1343 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) { 1344 struct in6_ndireq nd; 1345 1346 memset(&nd, 0, sizeof(nd)); 1347 nd.ndi.flags = ND_IFINFO(ifp)->flags; 1348 nd.ndi.flags &= ~ND6_IFF_IFDISABLED; 1349 if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0) 1350 log(LOG_NOTICE, "SIOCAIFADDR_IN6: " 1351 "SIOCSIFINFO_FLAGS for -ifdisabled " 1352 "failed."); 1353 /* 1354 * Ignore failure of clearing the flag intentionally. 1355 * The failure means address duplication was detected. 1356 */ 1357 } 1358 error = 0; 1359 1360 out: 1361 if (ia != NULL) 1362 ifa_free(&ia->ia_ifa); 1363 return (error); 1364 } 1365 1366 void 1367 in6_purgeaddr(struct ifaddr *ifa) 1368 { 1369 struct ifnet *ifp = ifa->ifa_ifp; 1370 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1371 struct in6_multi_mship *imm; 1372 int error; 1373 1374 if (ifa->ifa_carp) 1375 (*carp_detach_p)(ifa, false); 1376 1377 /* 1378 * Remove the loopback route to the interface address. 1379 * The check for the current setting of "nd6_useloopback" 1380 * is not needed. 1381 */ 1382 if (ia->ia_flags & IFA_RTSELF) { 1383 error = ifa_del_loopback_route((struct ifaddr *)ia, 1384 (struct sockaddr *)&ia->ia_addr); 1385 if (error == 0) 1386 ia->ia_flags &= ~IFA_RTSELF; 1387 } 1388 1389 /* stop DAD processing */ 1390 nd6_dad_stop(ifa); 1391 1392 /* Leave multicast groups. */ 1393 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1394 LIST_REMOVE(imm, i6mm_chain); 1395 if (imm->i6mm_maddr != NULL) 1396 in6_leavegroup(imm->i6mm_maddr, NULL); 1397 free(imm, M_IP6MADDR); 1398 } 1399 /* Check if we need to remove p2p route */ 1400 if ((ia->ia_flags & IFA_ROUTE) && ifa_is_p2p(ia)) { 1401 error = in6_handle_dstaddr_rtrequest(RTM_DELETE, ia); 1402 if (error != 0) 1403 log(LOG_INFO, "%s: err=%d, destination address delete " 1404 "failed\n", __func__, error); 1405 ia->ia_flags &= ~IFA_ROUTE; 1406 } 1407 1408 in6_newaddrmsg(ia, RTM_DELETE); 1409 in6_unlink_ifa(ia, ifp); 1410 } 1411 1412 /* 1413 * Removes @ia from the corresponding interfaces and unlinks corresponding 1414 * prefix if no addresses are using it anymore. 1415 */ 1416 void 1417 in6_purgeifaddr(struct in6_ifaddr *ia) 1418 { 1419 struct nd_prefix *pr; 1420 1421 /* 1422 * If the address being deleted is the only one that owns 1423 * the corresponding prefix, expire the prefix as well. 1424 * XXX: theoretically, we don't have to worry about such 1425 * relationship, since we separate the address management 1426 * and the prefix management. We do this, however, to provide 1427 * as much backward compatibility as possible in terms of 1428 * the ioctl operation. 1429 * Note that in6_purgeaddr() will decrement ndpr_addrcnt. 1430 */ 1431 pr = ia->ia6_ndpr; 1432 in6_purgeaddr(&ia->ia_ifa); 1433 if (pr != NULL && pr->ndpr_addrcnt == 0) { 1434 ND6_WLOCK(); 1435 nd6_prefix_unlink(pr, NULL); 1436 ND6_WUNLOCK(); 1437 nd6_prefix_del(pr); 1438 } 1439 } 1440 1441 1442 static void 1443 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1444 { 1445 char ip6buf[INET6_ADDRSTRLEN]; 1446 int remove_lle; 1447 1448 IF_ADDR_WLOCK(ifp); 1449 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link); 1450 IF_ADDR_WUNLOCK(ifp); 1451 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1452 1453 /* 1454 * Defer the release of what might be the last reference to the 1455 * in6_ifaddr so that it can't be freed before the remainder of the 1456 * cleanup. 1457 */ 1458 IN6_IFADDR_WLOCK(); 1459 CK_STAILQ_REMOVE(&V_in6_ifaddrhead, ia, in6_ifaddr, ia_link); 1460 CK_LIST_REMOVE(ia, ia6_hash); 1461 IN6_IFADDR_WUNLOCK(); 1462 1463 /* 1464 * Release the reference to the base prefix. There should be a 1465 * positive reference. 1466 */ 1467 remove_lle = 0; 1468 if (ia->ia6_ndpr == NULL) { 1469 nd6log((LOG_NOTICE, 1470 "in6_unlink_ifa: autoconf'ed address " 1471 "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia)))); 1472 } else { 1473 ia->ia6_ndpr->ndpr_addrcnt--; 1474 /* Do not delete lles within prefix if refcont != 0 */ 1475 if (ia->ia6_ndpr->ndpr_addrcnt == 0) 1476 remove_lle = 1; 1477 ia->ia6_ndpr = NULL; 1478 } 1479 1480 nd6_rem_ifa_lle(ia, remove_lle); 1481 1482 /* 1483 * Also, if the address being removed is autoconf'ed, call 1484 * pfxlist_onlink_check() since the release might affect the status of 1485 * other (detached) addresses. 1486 */ 1487 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1488 pfxlist_onlink_check(); 1489 } 1490 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1491 } 1492 1493 /* 1494 * Notifies other subsystems about address change/arrival: 1495 * 1) Notifies device handler on the first IPv6 address assignment 1496 * 2) Handle routing table changes for P2P links and route 1497 * 3) Handle routing table changes for address host route 1498 */ 1499 static int 1500 in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia, 1501 struct in6_aliasreq *ifra, int hostIsNew) 1502 { 1503 int error = 0, ifacount = 0; 1504 struct ifaddr *ifa; 1505 struct sockaddr_in6 *pdst; 1506 char ip6buf[INET6_ADDRSTRLEN]; 1507 1508 /* 1509 * Give the interface a chance to initialize 1510 * if this is its first address, 1511 */ 1512 if (hostIsNew != 0) { 1513 struct epoch_tracker et; 1514 1515 NET_EPOCH_ENTER(et); 1516 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1517 if (ifa->ifa_addr->sa_family != AF_INET6) 1518 continue; 1519 ifacount++; 1520 } 1521 NET_EPOCH_EXIT(et); 1522 } 1523 1524 if (ifacount <= 1 && ifp->if_ioctl) { 1525 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1526 if (error) 1527 goto done; 1528 } 1529 1530 /* 1531 * If a new destination address is specified, scrub the old one and 1532 * install the new destination. Note that the interface must be 1533 * p2p or loopback. 1534 */ 1535 pdst = &ifra->ifra_dstaddr; 1536 if (pdst->sin6_family == AF_INET6 && 1537 !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1538 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1539 (in6_handle_dstaddr_rtrequest(RTM_DELETE, ia) != 0)) { 1540 nd6log((LOG_ERR, "in6_update_ifa_internal: failed to " 1541 "remove a route to the old destination: %s\n", 1542 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1543 /* proceed anyway... */ 1544 } else 1545 ia->ia_flags &= ~IFA_ROUTE; 1546 ia->ia_dstaddr = *pdst; 1547 } 1548 1549 /* 1550 * If a new destination address is specified for a point-to-point 1551 * interface, install a route to the destination as an interface 1552 * direct route. 1553 * XXX: the logic below rejects assigning multiple addresses on a p2p 1554 * interface that share the same destination. 1555 */ 1556 if (!(ia->ia_flags & IFA_ROUTE) && ifa_is_p2p(ia)) { 1557 error = in6_handle_dstaddr_rtrequest(RTM_ADD, ia); 1558 if (error) 1559 goto done; 1560 ia->ia_flags |= IFA_ROUTE; 1561 } 1562 1563 /* 1564 * add a loopback route to self if not exists 1565 */ 1566 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) { 1567 error = ifa_add_loopback_route((struct ifaddr *)ia, 1568 (struct sockaddr *)&ia->ia_addr); 1569 if (error == 0) 1570 ia->ia_flags |= IFA_RTSELF; 1571 } 1572 done: 1573 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 1574 "Invoking IPv6 network device address event may sleep"); 1575 1576 ifa_ref(&ia->ia_ifa); 1577 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa, 1578 IFADDR_EVENT_ADD); 1579 ifa_free(&ia->ia_ifa); 1580 1581 return (error); 1582 } 1583 1584 /* 1585 * Find an IPv6 interface link-local address specific to an interface. 1586 * ifaddr is returned referenced. 1587 */ 1588 struct in6_ifaddr * 1589 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1590 { 1591 struct ifaddr *ifa; 1592 1593 NET_EPOCH_ASSERT(); 1594 1595 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1596 if (ifa->ifa_addr->sa_family != AF_INET6) 1597 continue; 1598 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1599 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1600 ignoreflags) != 0) 1601 continue; 1602 ifa_ref(ifa); 1603 break; 1604 } 1605 } 1606 1607 return ((struct in6_ifaddr *)ifa); 1608 } 1609 1610 /* 1611 * find the interface address corresponding to a given IPv6 address. 1612 * ifaddr is returned referenced if @referenced flag is set. 1613 */ 1614 struct in6_ifaddr * 1615 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid, bool referenced) 1616 { 1617 struct rm_priotracker in6_ifa_tracker; 1618 struct in6_ifaddr *ia; 1619 1620 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1621 CK_LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) { 1622 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1623 if (zoneid != 0 && 1624 zoneid != ia->ia_addr.sin6_scope_id) 1625 continue; 1626 if (referenced) 1627 ifa_ref(&ia->ia_ifa); 1628 break; 1629 } 1630 } 1631 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1632 return (ia); 1633 } 1634 1635 /* 1636 * find the internet address corresponding to a given interface and address. 1637 * ifaddr is returned referenced. 1638 */ 1639 struct in6_ifaddr * 1640 in6ifa_ifpwithaddr(struct ifnet *ifp, const struct in6_addr *addr) 1641 { 1642 struct epoch_tracker et; 1643 struct ifaddr *ifa; 1644 1645 NET_EPOCH_ENTER(et); 1646 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1647 if (ifa->ifa_addr->sa_family != AF_INET6) 1648 continue; 1649 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1650 ifa_ref(ifa); 1651 break; 1652 } 1653 } 1654 NET_EPOCH_EXIT(et); 1655 1656 return ((struct in6_ifaddr *)ifa); 1657 } 1658 1659 /* 1660 * Find a link-local scoped address on ifp and return it if any. 1661 */ 1662 struct in6_ifaddr * 1663 in6ifa_llaonifp(struct ifnet *ifp) 1664 { 1665 struct epoch_tracker et; 1666 struct sockaddr_in6 *sin6; 1667 struct ifaddr *ifa; 1668 1669 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1670 return (NULL); 1671 NET_EPOCH_ENTER(et); 1672 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1673 if (ifa->ifa_addr->sa_family != AF_INET6) 1674 continue; 1675 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 1676 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 1677 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) || 1678 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr)) 1679 break; 1680 } 1681 NET_EPOCH_EXIT(et); 1682 1683 return ((struct in6_ifaddr *)ifa); 1684 } 1685 1686 /* 1687 * Convert IP6 address to printable (loggable) representation. Caller 1688 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 1689 */ 1690 static char digits[] = "0123456789abcdef"; 1691 char * 1692 ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 1693 { 1694 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0; 1695 char *cp; 1696 const u_int16_t *a = (const u_int16_t *)addr; 1697 const u_int8_t *d; 1698 int dcolon = 0, zero = 0; 1699 1700 cp = ip6buf; 1701 1702 for (i = 0; i < 8; i++) { 1703 if (*(a + i) == 0) { 1704 cnt++; 1705 if (cnt == 1) 1706 idx = i; 1707 } 1708 else if (maxcnt < cnt) { 1709 maxcnt = cnt; 1710 index = idx; 1711 cnt = 0; 1712 } 1713 } 1714 if (maxcnt < cnt) { 1715 maxcnt = cnt; 1716 index = idx; 1717 } 1718 1719 for (i = 0; i < 8; i++) { 1720 if (dcolon == 1) { 1721 if (*a == 0) { 1722 if (i == 7) 1723 *cp++ = ':'; 1724 a++; 1725 continue; 1726 } else 1727 dcolon = 2; 1728 } 1729 if (*a == 0) { 1730 if (dcolon == 0 && *(a + 1) == 0 && i == index) { 1731 if (i == 0) 1732 *cp++ = ':'; 1733 *cp++ = ':'; 1734 dcolon = 1; 1735 } else { 1736 *cp++ = '0'; 1737 *cp++ = ':'; 1738 } 1739 a++; 1740 continue; 1741 } 1742 d = (const u_char *)a; 1743 /* Try to eliminate leading zeros in printout like in :0001. */ 1744 zero = 1; 1745 *cp = digits[*d >> 4]; 1746 if (*cp != '0') { 1747 zero = 0; 1748 cp++; 1749 } 1750 *cp = digits[*d++ & 0xf]; 1751 if (zero == 0 || (*cp != '0')) { 1752 zero = 0; 1753 cp++; 1754 } 1755 *cp = digits[*d >> 4]; 1756 if (zero == 0 || (*cp != '0')) { 1757 zero = 0; 1758 cp++; 1759 } 1760 *cp++ = digits[*d & 0xf]; 1761 *cp++ = ':'; 1762 a++; 1763 } 1764 *--cp = '\0'; 1765 return (ip6buf); 1766 } 1767 1768 int 1769 in6_localaddr(struct in6_addr *in6) 1770 { 1771 struct rm_priotracker in6_ifa_tracker; 1772 struct in6_ifaddr *ia; 1773 1774 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1775 return 1; 1776 1777 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1778 CK_STAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 1779 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1780 &ia->ia_prefixmask.sin6_addr)) { 1781 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1782 return 1; 1783 } 1784 } 1785 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1786 1787 return (0); 1788 } 1789 1790 /* 1791 * Return 1 if an internet address is for the local host and configured 1792 * on one of its interfaces. 1793 */ 1794 int 1795 in6_localip(struct in6_addr *in6) 1796 { 1797 struct rm_priotracker in6_ifa_tracker; 1798 struct in6_ifaddr *ia; 1799 1800 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1801 CK_LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 1802 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) { 1803 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1804 return (1); 1805 } 1806 } 1807 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1808 return (0); 1809 } 1810 1811 /* 1812 * Like in6_localip(), but FIB-aware. 1813 */ 1814 bool 1815 in6_localip_fib(struct in6_addr *in6, uint16_t fib) 1816 { 1817 struct rm_priotracker in6_ifa_tracker; 1818 struct in6_ifaddr *ia; 1819 1820 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1821 CK_LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 1822 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr) && 1823 ia->ia_ifa.ifa_ifp->if_fib == fib) { 1824 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1825 return (true); 1826 } 1827 } 1828 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1829 return (false); 1830 } 1831 1832 /* 1833 * Return 1 if an internet address is configured on an interface. 1834 */ 1835 int 1836 in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr) 1837 { 1838 struct in6_addr in6; 1839 struct ifaddr *ifa; 1840 struct in6_ifaddr *ia6; 1841 1842 NET_EPOCH_ASSERT(); 1843 1844 in6 = *addr; 1845 if (in6_clearscope(&in6)) 1846 return (0); 1847 in6_setscope(&in6, ifp, NULL); 1848 1849 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1850 if (ifa->ifa_addr->sa_family != AF_INET6) 1851 continue; 1852 ia6 = (struct in6_ifaddr *)ifa; 1853 if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) 1854 return (1); 1855 } 1856 1857 return (0); 1858 } 1859 1860 int 1861 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1862 { 1863 struct rm_priotracker in6_ifa_tracker; 1864 struct in6_ifaddr *ia; 1865 1866 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1867 CK_LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) { 1868 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) { 1869 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 1870 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1871 return (1); /* true */ 1872 } 1873 break; 1874 } 1875 } 1876 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1877 1878 return (0); /* false */ 1879 } 1880 1881 /* 1882 * return length of part which dst and src are equal 1883 * hard coding... 1884 */ 1885 int 1886 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1887 { 1888 int match = 0; 1889 u_char *s = (u_char *)src, *d = (u_char *)dst; 1890 u_char *lim = s + 16, r; 1891 1892 while (s < lim) 1893 if ((r = (*d++ ^ *s++)) != 0) { 1894 while (r < 128) { 1895 match++; 1896 r <<= 1; 1897 } 1898 break; 1899 } else 1900 match += 8; 1901 return match; 1902 } 1903 1904 /* XXX: to be scope conscious */ 1905 int 1906 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1907 { 1908 int bytelen, bitlen; 1909 1910 /* sanity check */ 1911 if (0 > len || len > 128) { 1912 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1913 len); 1914 return (0); 1915 } 1916 1917 bytelen = len / 8; 1918 bitlen = len % 8; 1919 1920 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1921 return (0); 1922 if (bitlen != 0 && 1923 p1->s6_addr[bytelen] >> (8 - bitlen) != 1924 p2->s6_addr[bytelen] >> (8 - bitlen)) 1925 return (0); 1926 1927 return (1); 1928 } 1929 1930 void 1931 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1932 { 1933 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1934 int bytelen, bitlen, i; 1935 1936 /* sanity check */ 1937 if (0 > len || len > 128) { 1938 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1939 len); 1940 return; 1941 } 1942 1943 bzero(maskp, sizeof(*maskp)); 1944 bytelen = len / 8; 1945 bitlen = len % 8; 1946 for (i = 0; i < bytelen; i++) 1947 maskp->s6_addr[i] = 0xff; 1948 if (bitlen) 1949 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1950 } 1951 1952 /* 1953 * return the best address out of the same scope. if no address was 1954 * found, return the first valid address from designated IF. 1955 */ 1956 struct in6_ifaddr * 1957 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 1958 { 1959 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 1960 struct ifaddr *ifa; 1961 struct in6_ifaddr *besta = NULL; 1962 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 1963 1964 NET_EPOCH_ASSERT(); 1965 1966 dep[0] = dep[1] = NULL; 1967 1968 /* 1969 * We first look for addresses in the same scope. 1970 * If there is one, return it. 1971 * If two or more, return one which matches the dst longest. 1972 * If none, return one of global addresses assigned other ifs. 1973 */ 1974 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1975 if (ifa->ifa_addr->sa_family != AF_INET6) 1976 continue; 1977 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1978 continue; /* XXX: is there any case to allow anycast? */ 1979 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1980 continue; /* don't use this interface */ 1981 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1982 continue; 1983 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1984 if (V_ip6_use_deprecated) 1985 dep[0] = (struct in6_ifaddr *)ifa; 1986 continue; 1987 } 1988 1989 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 1990 /* 1991 * call in6_matchlen() as few as possible 1992 */ 1993 if (besta) { 1994 if (blen == -1) 1995 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 1996 tlen = in6_matchlen(IFA_IN6(ifa), dst); 1997 if (tlen > blen) { 1998 blen = tlen; 1999 besta = (struct in6_ifaddr *)ifa; 2000 } 2001 } else 2002 besta = (struct in6_ifaddr *)ifa; 2003 } 2004 } 2005 if (besta) 2006 return (besta); 2007 2008 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2009 if (ifa->ifa_addr->sa_family != AF_INET6) 2010 continue; 2011 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2012 continue; /* XXX: is there any case to allow anycast? */ 2013 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2014 continue; /* don't use this interface */ 2015 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2016 continue; 2017 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2018 if (V_ip6_use_deprecated) 2019 dep[1] = (struct in6_ifaddr *)ifa; 2020 continue; 2021 } 2022 2023 return (struct in6_ifaddr *)ifa; 2024 } 2025 2026 /* use the last-resort values, that are, deprecated addresses */ 2027 if (dep[0]) 2028 return dep[0]; 2029 if (dep[1]) 2030 return dep[1]; 2031 2032 return NULL; 2033 } 2034 2035 /* 2036 * perform DAD when interface becomes IFF_UP. 2037 */ 2038 void 2039 in6_if_up(struct ifnet *ifp) 2040 { 2041 struct epoch_tracker et; 2042 struct ifaddr *ifa; 2043 struct in6_ifaddr *ia; 2044 2045 NET_EPOCH_ENTER(et); 2046 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2047 if (ifa->ifa_addr->sa_family != AF_INET6) 2048 continue; 2049 ia = (struct in6_ifaddr *)ifa; 2050 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2051 /* 2052 * The TENTATIVE flag was likely set by hand 2053 * beforehand, implicitly indicating the need for DAD. 2054 * We may be able to skip the random delay in this 2055 * case, but we impose delays just in case. 2056 */ 2057 nd6_dad_start(ifa, 2058 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 2059 } 2060 } 2061 NET_EPOCH_EXIT(et); 2062 2063 /* 2064 * special cases, like 6to4, are handled in in6_ifattach 2065 */ 2066 in6_ifattach(ifp, NULL); 2067 } 2068 2069 static void 2070 in6_ifevent(void *arg __unused, struct ifnet *ifp, int event) 2071 { 2072 if (event == IFNET_EVENT_UP) 2073 in6_if_up(ifp); 2074 } 2075 2076 static void 2077 in6_init(void *arg __unused) 2078 { 2079 EVENTHANDLER_REGISTER(ifnet_event, in6_ifevent, NULL, EVENTHANDLER_PRI_ANY); 2080 } 2081 SYSINIT(in6_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, in6_init, NULL); 2082 2083 int 2084 in6if_do_dad(struct ifnet *ifp) 2085 { 2086 2087 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 2088 return (0); 2089 if ((ifp->if_flags & IFF_MULTICAST) == 0) 2090 return (0); 2091 if ((ND_IFINFO(ifp)->flags & 2092 (ND6_IFF_IFDISABLED | ND6_IFF_NO_DAD)) != 0) 2093 return (0); 2094 return (1); 2095 } 2096 2097 /* 2098 * Calculate max IPv6 MTU through all the interfaces and store it 2099 * to in6_maxmtu. 2100 */ 2101 void 2102 in6_setmaxmtu(void) 2103 { 2104 struct epoch_tracker et; 2105 unsigned long maxmtu = 0; 2106 struct ifnet *ifp; 2107 2108 NET_EPOCH_ENTER(et); 2109 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2110 /* this function can be called during ifnet initialization */ 2111 if (!ifp->if_afdata[AF_INET6]) 2112 continue; 2113 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2114 IN6_LINKMTU(ifp) > maxmtu) 2115 maxmtu = IN6_LINKMTU(ifp); 2116 } 2117 NET_EPOCH_EXIT(et); 2118 if (maxmtu) /* update only when maxmtu is positive */ 2119 V_in6_maxmtu = maxmtu; 2120 } 2121 2122 /* 2123 * Provide the length of interface identifiers to be used for the link attached 2124 * to the given interface. The length should be defined in "IPv6 over 2125 * xxx-link" document. Note that address architecture might also define 2126 * the length for a particular set of address prefixes, regardless of the 2127 * link type. As clarified in rfc2462bis, those two definitions should be 2128 * consistent, and those really are as of August 2004. 2129 */ 2130 int 2131 in6_if2idlen(struct ifnet *ifp) 2132 { 2133 switch (ifp->if_type) { 2134 case IFT_ETHER: /* RFC2464 */ 2135 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2136 case IFT_L2VLAN: /* ditto */ 2137 case IFT_BRIDGE: /* bridge(4) only does Ethernet-like links */ 2138 case IFT_INFINIBAND: 2139 return (64); 2140 case IFT_PPP: /* RFC2472 */ 2141 return (64); 2142 case IFT_FRELAY: /* RFC2590 */ 2143 return (64); 2144 case IFT_IEEE1394: /* RFC3146 */ 2145 return (64); 2146 case IFT_GIF: 2147 return (64); /* draft-ietf-v6ops-mech-v2-07 */ 2148 case IFT_LOOP: 2149 return (64); /* XXX: is this really correct? */ 2150 default: 2151 /* 2152 * Unknown link type: 2153 * It might be controversial to use the today's common constant 2154 * of 64 for these cases unconditionally. For full compliance, 2155 * we should return an error in this case. On the other hand, 2156 * if we simply miss the standard for the link type or a new 2157 * standard is defined for a new link type, the IFID length 2158 * is very likely to be the common constant. As a compromise, 2159 * we always use the constant, but make an explicit notice 2160 * indicating the "unknown" case. 2161 */ 2162 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2163 return (64); 2164 } 2165 } 2166 2167 struct in6_llentry { 2168 struct llentry base; 2169 }; 2170 2171 #define IN6_LLTBL_DEFAULT_HSIZE 32 2172 #define IN6_LLTBL_HASH(k, h) \ 2173 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 2174 2175 /* 2176 * Do actual deallocation of @lle. 2177 */ 2178 static void 2179 in6_lltable_destroy_lle_unlocked(epoch_context_t ctx) 2180 { 2181 struct llentry *lle; 2182 2183 lle = __containerof(ctx, struct llentry, lle_epoch_ctx); 2184 LLE_LOCK_DESTROY(lle); 2185 LLE_REQ_DESTROY(lle); 2186 free(lle, M_LLTABLE); 2187 } 2188 2189 /* 2190 * Called by LLE_FREE_LOCKED when number of references 2191 * drops to zero. 2192 */ 2193 static void 2194 in6_lltable_destroy_lle(struct llentry *lle) 2195 { 2196 2197 LLE_WUNLOCK(lle); 2198 NET_EPOCH_CALL(in6_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx); 2199 } 2200 2201 static struct llentry * 2202 in6_lltable_new(const struct in6_addr *addr6, u_int flags) 2203 { 2204 struct in6_llentry *lle; 2205 2206 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 2207 if (lle == NULL) /* NB: caller generates msg */ 2208 return NULL; 2209 2210 lle->base.r_l3addr.addr6 = *addr6; 2211 lle->base.lle_refcnt = 1; 2212 lle->base.lle_free = in6_lltable_destroy_lle; 2213 LLE_LOCK_INIT(&lle->base); 2214 LLE_REQ_INIT(&lle->base); 2215 callout_init(&lle->base.lle_timer, 1); 2216 2217 return (&lle->base); 2218 } 2219 2220 static int 2221 in6_lltable_match_prefix(const struct sockaddr *saddr, 2222 const struct sockaddr *smask, u_int flags, struct llentry *lle) 2223 { 2224 const struct in6_addr *addr, *mask, *lle_addr; 2225 2226 addr = &((const struct sockaddr_in6 *)saddr)->sin6_addr; 2227 mask = &((const struct sockaddr_in6 *)smask)->sin6_addr; 2228 lle_addr = &lle->r_l3addr.addr6; 2229 2230 if (IN6_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0) 2231 return (0); 2232 2233 if (lle->la_flags & LLE_IFADDR) { 2234 /* 2235 * Delete LLE_IFADDR records IFF address & flag matches. 2236 * Note that addr is the interface address within prefix 2237 * being matched. 2238 */ 2239 if (IN6_ARE_ADDR_EQUAL(addr, lle_addr) && 2240 (flags & LLE_STATIC) != 0) 2241 return (1); 2242 return (0); 2243 } 2244 2245 /* flags & LLE_STATIC means deleting both dynamic and static entries */ 2246 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC)) 2247 return (1); 2248 2249 return (0); 2250 } 2251 2252 static void 2253 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle) 2254 { 2255 struct ifnet *ifp __diagused; 2256 2257 LLE_WLOCK_ASSERT(lle); 2258 KASSERT(llt != NULL, ("lltable is NULL")); 2259 2260 /* Unlink entry from table */ 2261 if ((lle->la_flags & LLE_LINKED) != 0) { 2262 ifp = llt->llt_ifp; 2263 IF_AFDATA_WLOCK_ASSERT(ifp); 2264 lltable_unlink_entry(llt, lle); 2265 } 2266 2267 llentry_free(lle); 2268 } 2269 2270 static int 2271 in6_lltable_rtcheck(struct ifnet *ifp, 2272 u_int flags, 2273 const struct sockaddr *l3addr) 2274 { 2275 const struct sockaddr_in6 *sin6; 2276 struct nhop_object *nh; 2277 struct in6_addr dst; 2278 uint32_t scopeid; 2279 char ip6buf[INET6_ADDRSTRLEN]; 2280 int fibnum; 2281 2282 NET_EPOCH_ASSERT(); 2283 KASSERT(l3addr->sa_family == AF_INET6, 2284 ("sin_family %d", l3addr->sa_family)); 2285 2286 sin6 = (const struct sockaddr_in6 *)l3addr; 2287 in6_splitscope(&sin6->sin6_addr, &dst, &scopeid); 2288 fibnum = V_rt_add_addr_allfibs ? RT_DEFAULT_FIB : ifp->if_fib; 2289 nh = fib6_lookup(fibnum, &dst, scopeid, NHR_NONE, 0); 2290 if (nh && ((nh->nh_flags & NHF_GATEWAY) || nh->nh_ifp != ifp)) { 2291 struct ifaddr *ifa; 2292 /* 2293 * Create an ND6 cache for an IPv6 neighbor 2294 * that is not covered by our own prefix. 2295 */ 2296 ifa = ifaof_ifpforaddr(l3addr, ifp); 2297 if (ifa != NULL) { 2298 return 0; 2299 } 2300 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2301 ip6_sprintf(ip6buf, &sin6->sin6_addr)); 2302 return EINVAL; 2303 } 2304 return 0; 2305 } 2306 2307 static inline uint32_t 2308 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize) 2309 { 2310 2311 return (IN6_LLTBL_HASH(dst->s6_addr32[3], hsize)); 2312 } 2313 2314 static uint32_t 2315 in6_lltable_hash(const struct llentry *lle, uint32_t hsize) 2316 { 2317 2318 return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize)); 2319 } 2320 2321 static void 2322 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 2323 { 2324 struct sockaddr_in6 *sin6; 2325 2326 sin6 = (struct sockaddr_in6 *)sa; 2327 bzero(sin6, sizeof(*sin6)); 2328 sin6->sin6_family = AF_INET6; 2329 sin6->sin6_len = sizeof(*sin6); 2330 sin6->sin6_addr = lle->r_l3addr.addr6; 2331 } 2332 2333 static inline struct llentry * 2334 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst) 2335 { 2336 struct llentry *lle; 2337 struct llentries *lleh; 2338 u_int hashidx; 2339 2340 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize); 2341 lleh = &llt->lle_head[hashidx]; 2342 CK_LIST_FOREACH(lle, lleh, lle_next) { 2343 if (lle->la_flags & LLE_DELETED) 2344 continue; 2345 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst)) 2346 break; 2347 } 2348 2349 return (lle); 2350 } 2351 2352 static void 2353 in6_lltable_delete_entry(struct lltable *llt, struct llentry *lle) 2354 { 2355 2356 lle->la_flags |= LLE_DELETED; 2357 2358 /* Leave the solicited multicast group. */ 2359 if ((lle->la_flags & LLE_PUB) != 0) 2360 in6_leave_proxy_ndp_mc(llt->llt_ifp, &lle->r_l3addr.addr6); 2361 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 2362 #ifdef DIAGNOSTIC 2363 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2364 #endif 2365 llentry_free(lle); 2366 } 2367 2368 static struct llentry * 2369 in6_lltable_alloc(struct lltable *llt, u_int flags, 2370 const struct sockaddr *l3addr) 2371 { 2372 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2373 struct ifnet *ifp = llt->llt_ifp; 2374 struct llentry *lle; 2375 char linkhdr[LLE_MAX_LINKHDR]; 2376 size_t linkhdrsize; 2377 int lladdr_off; 2378 2379 KASSERT(l3addr->sa_family == AF_INET6, 2380 ("sin_family %d", l3addr->sa_family)); 2381 2382 /* 2383 * A route that covers the given address must have 2384 * been installed 1st because we are doing a resolution, 2385 * verify this. 2386 */ 2387 if (!(flags & LLE_IFADDR) && 2388 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2389 return (NULL); 2390 2391 lle = in6_lltable_new(&sin6->sin6_addr, flags); 2392 if (lle == NULL) { 2393 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2394 return (NULL); 2395 } 2396 lle->la_flags = flags; 2397 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 2398 linkhdrsize = LLE_MAX_LINKHDR; 2399 if (lltable_calc_llheader(ifp, AF_INET6, IF_LLADDR(ifp), 2400 linkhdr, &linkhdrsize, &lladdr_off) != 0) { 2401 in6_lltable_free_entry(llt, lle); 2402 return (NULL); 2403 } 2404 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize, 2405 lladdr_off); 2406 lle->la_flags |= LLE_STATIC; 2407 } 2408 2409 if ((lle->la_flags & LLE_STATIC) != 0) 2410 lle->ln_state = ND6_LLINFO_REACHABLE; 2411 2412 return (lle); 2413 } 2414 2415 static struct llentry * 2416 in6_lltable_lookup(struct lltable *llt, u_int flags, 2417 const struct sockaddr *l3addr) 2418 { 2419 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2420 int family = flags >> 16; 2421 struct llentry *lle; 2422 2423 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 2424 KASSERT(l3addr->sa_family == AF_INET6, 2425 ("sin_family %d", l3addr->sa_family)); 2426 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) != 2427 (LLE_UNLOCKED | LLE_EXCLUSIVE), 2428 ("wrong lle request flags: %#x", flags)); 2429 2430 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2431 2432 if (__predict_false(family != AF_INET6)) 2433 lle = llentry_lookup_family(lle, family); 2434 2435 if (lle == NULL) 2436 return (NULL); 2437 2438 if (flags & LLE_UNLOCKED) 2439 return (lle); 2440 2441 if (flags & LLE_EXCLUSIVE) 2442 LLE_WLOCK(lle); 2443 else 2444 LLE_RLOCK(lle); 2445 2446 /* 2447 * If the afdata lock is not held, the LLE may have been unlinked while 2448 * we were blocked on the LLE lock. Check for this case. 2449 */ 2450 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) { 2451 if (flags & LLE_EXCLUSIVE) 2452 LLE_WUNLOCK(lle); 2453 else 2454 LLE_RUNLOCK(lle); 2455 return (NULL); 2456 } 2457 return (lle); 2458 } 2459 2460 static int 2461 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 2462 struct sysctl_req *wr) 2463 { 2464 struct ifnet *ifp = llt->llt_ifp; 2465 /* XXX stack use */ 2466 struct { 2467 struct rt_msghdr rtm; 2468 struct sockaddr_in6 sin6; 2469 /* 2470 * ndp.c assumes that sdl is word aligned 2471 */ 2472 #ifdef __LP64__ 2473 uint32_t pad; 2474 #endif 2475 struct sockaddr_dl sdl; 2476 } ndpc; 2477 struct sockaddr_dl *sdl; 2478 int error; 2479 2480 bzero(&ndpc, sizeof(ndpc)); 2481 /* skip deleted entries */ 2482 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 2483 return (0); 2484 /* Skip if jailed and not a valid IP of the prison. */ 2485 lltable_fill_sa_entry(lle, (struct sockaddr *)&ndpc.sin6); 2486 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&ndpc.sin6) != 0) 2487 return (0); 2488 /* 2489 * produce a msg made of: 2490 * struct rt_msghdr; 2491 * struct sockaddr_in6 (IPv6) 2492 * struct sockaddr_dl; 2493 */ 2494 ndpc.rtm.rtm_msglen = sizeof(ndpc); 2495 ndpc.rtm.rtm_version = RTM_VERSION; 2496 ndpc.rtm.rtm_type = RTM_GET; 2497 ndpc.rtm.rtm_flags = RTF_UP; 2498 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 2499 sa6_recoverscope(&ndpc.sin6); 2500 2501 /* publish */ 2502 if (lle->la_flags & LLE_PUB) 2503 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE; 2504 2505 sdl = &ndpc.sdl; 2506 sdl->sdl_family = AF_LINK; 2507 sdl->sdl_len = sizeof(*sdl); 2508 sdl->sdl_index = ifp->if_index; 2509 sdl->sdl_type = ifp->if_type; 2510 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 2511 sdl->sdl_alen = ifp->if_addrlen; 2512 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 2513 } else { 2514 sdl->sdl_alen = 0; 2515 bzero(LLADDR(sdl), ifp->if_addrlen); 2516 } 2517 if (lle->la_expire != 0) 2518 ndpc.rtm.rtm_rmx.rmx_expire = lle->la_expire + 2519 lle->lle_remtime / hz + time_second - time_uptime; 2520 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 2521 if (lle->la_flags & LLE_STATIC) 2522 ndpc.rtm.rtm_flags |= RTF_STATIC; 2523 if (lle->la_flags & LLE_IFADDR) 2524 ndpc.rtm.rtm_flags |= RTF_PINNED; 2525 if (lle->ln_router != 0) 2526 ndpc.rtm.rtm_flags |= RTF_GATEWAY; 2527 ndpc.rtm.rtm_rmx.rmx_pksent = lle->la_asked; 2528 /* Store state in rmx_weight value */ 2529 ndpc.rtm.rtm_rmx.rmx_state = lle->ln_state; 2530 ndpc.rtm.rtm_index = ifp->if_index; 2531 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc)); 2532 2533 return (error); 2534 } 2535 2536 static void 2537 in6_lltable_post_resolved(struct lltable *llt, struct llentry *lle) 2538 { 2539 /* Join the solicited multicast group for dst. */ 2540 if ((lle->la_flags & LLE_PUB) == LLE_PUB) 2541 in6_join_proxy_ndp_mc(llt->llt_ifp, &lle->r_l3addr.addr6); 2542 } 2543 2544 static struct lltable * 2545 in6_lltattach(struct ifnet *ifp) 2546 { 2547 struct lltable *llt; 2548 2549 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE); 2550 llt->llt_af = AF_INET6; 2551 llt->llt_ifp = ifp; 2552 2553 llt->llt_lookup = in6_lltable_lookup; 2554 llt->llt_alloc_entry = in6_lltable_alloc; 2555 llt->llt_delete_entry = in6_lltable_delete_entry; 2556 llt->llt_dump_entry = in6_lltable_dump_entry; 2557 llt->llt_hash = in6_lltable_hash; 2558 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry; 2559 llt->llt_free_entry = in6_lltable_free_entry; 2560 llt->llt_match_prefix = in6_lltable_match_prefix; 2561 llt->llt_mark_used = llentry_mark_used; 2562 llt->llt_post_resolved = in6_lltable_post_resolved; 2563 lltable_link(llt); 2564 2565 return (llt); 2566 } 2567 2568 struct lltable * 2569 in6_lltable_get(struct ifnet *ifp) 2570 { 2571 struct lltable *llt = NULL; 2572 2573 void *afdata_ptr = ifp->if_afdata[AF_INET6]; 2574 if (afdata_ptr != NULL) 2575 llt = ((struct in6_ifextra *)afdata_ptr)->lltable; 2576 return (llt); 2577 } 2578 2579 void * 2580 in6_domifattach(struct ifnet *ifp) 2581 { 2582 struct in6_ifextra *ext; 2583 2584 /* There are not IPv6-capable interfaces. */ 2585 switch (ifp->if_type) { 2586 case IFT_PFLOG: 2587 case IFT_PFSYNC: 2588 case IFT_USB: 2589 return (NULL); 2590 } 2591 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2592 bzero(ext, sizeof(*ext)); 2593 2594 ext->in6_ifstat = malloc(sizeof(counter_u64_t) * 2595 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK); 2596 COUNTER_ARRAY_ALLOC(ext->in6_ifstat, 2597 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK); 2598 2599 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) * 2600 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR, 2601 M_WAITOK); 2602 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat, 2603 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK); 2604 2605 ext->nd_ifinfo = nd6_ifattach(ifp); 2606 ext->scope6_id = scope6_ifattach(ifp); 2607 ext->lltable = in6_lltattach(ifp); 2608 2609 ext->mld_ifinfo = mld_domifattach(ifp); 2610 2611 return ext; 2612 } 2613 2614 int 2615 in6_domifmtu(struct ifnet *ifp) 2616 { 2617 if (ifp->if_afdata[AF_INET6] == NULL) 2618 return ifp->if_mtu; 2619 2620 return (IN6_LINKMTU(ifp)); 2621 } 2622 2623 void 2624 in6_domifdetach(struct ifnet *ifp, void *aux) 2625 { 2626 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2627 2628 mld_domifdetach(ifp); 2629 scope6_ifdetach(ext->scope6_id); 2630 nd6_ifdetach(ifp, ext->nd_ifinfo); 2631 lltable_free(ext->lltable); 2632 COUNTER_ARRAY_FREE(ext->in6_ifstat, 2633 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 2634 free(ext->in6_ifstat, M_IFADDR); 2635 COUNTER_ARRAY_FREE(ext->icmp6_ifstat, 2636 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 2637 free(ext->icmp6_ifstat, M_IFADDR); 2638 free(ext, M_IFADDR); 2639 } 2640 2641 /* 2642 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2643 * v4 mapped addr or v4 compat addr 2644 */ 2645 void 2646 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2647 { 2648 2649 bzero(sin, sizeof(*sin)); 2650 sin->sin_len = sizeof(struct sockaddr_in); 2651 sin->sin_family = AF_INET; 2652 sin->sin_port = sin6->sin6_port; 2653 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2654 } 2655 2656 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2657 void 2658 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2659 { 2660 bzero(sin6, sizeof(*sin6)); 2661 sin6->sin6_len = sizeof(struct sockaddr_in6); 2662 sin6->sin6_family = AF_INET6; 2663 sin6->sin6_port = sin->sin_port; 2664 sin6->sin6_addr.s6_addr32[0] = 0; 2665 sin6->sin6_addr.s6_addr32[1] = 0; 2666 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2667 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2668 } 2669 2670 /* Convert sockaddr_in6 into sockaddr_in. */ 2671 void 2672 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2673 { 2674 struct sockaddr_in *sin_p; 2675 struct sockaddr_in6 sin6; 2676 2677 /* 2678 * Save original sockaddr_in6 addr and convert it 2679 * to sockaddr_in. 2680 */ 2681 sin6 = *(struct sockaddr_in6 *)nam; 2682 sin_p = (struct sockaddr_in *)nam; 2683 in6_sin6_2_sin(sin_p, &sin6); 2684 } 2685 2686 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2687 void 2688 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2689 { 2690 struct sockaddr_in *sin_p; 2691 struct sockaddr_in6 *sin6_p; 2692 2693 sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK); 2694 sin_p = (struct sockaddr_in *)*nam; 2695 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2696 free(*nam, M_SONAME); 2697 *nam = (struct sockaddr *)sin6_p; 2698 } 2699 2700 /* 2701 * Join/leave the solicited multicast groups for proxy NDP entries. 2702 */ 2703 static void 2704 in6_join_proxy_ndp_mc(struct ifnet *ifp, const struct in6_addr *dst) 2705 { 2706 struct in6_multi *inm; 2707 struct in6_addr mltaddr; 2708 char ip6buf[INET6_ADDRSTRLEN]; 2709 int error; 2710 2711 if (in6_solicited_node_maddr(&mltaddr, ifp, dst) != 0) 2712 return; /* error logged in in6_solicited_node_maddr. */ 2713 2714 error = in6_joingroup(ifp, &mltaddr, NULL, &inm, 0); 2715 if (error != 0) { 2716 nd6log((LOG_WARNING, 2717 "%s: in6_joingroup failed for %s on %s (errno=%d)\n", 2718 __func__, ip6_sprintf(ip6buf, &mltaddr), if_name(ifp), 2719 error)); 2720 } 2721 } 2722 2723 static void 2724 in6_leave_proxy_ndp_mc(struct ifnet *ifp, const struct in6_addr *dst) 2725 { 2726 struct epoch_tracker et; 2727 struct in6_multi *inm; 2728 struct in6_addr mltaddr; 2729 char ip6buf[INET6_ADDRSTRLEN]; 2730 2731 if (in6_solicited_node_maddr(&mltaddr, ifp, dst) != 0) 2732 return; /* error logged in in6_solicited_node_maddr. */ 2733 2734 NET_EPOCH_ENTER(et); 2735 inm = in6m_lookup(ifp, &mltaddr); 2736 NET_EPOCH_EXIT(et); 2737 if (inm != NULL) 2738 in6_leavegroup(inm, NULL); 2739 else 2740 nd6log((LOG_WARNING, "%s: in6m_lookup failed for %s on %s\n", 2741 __func__, ip6_sprintf(ip6buf, &mltaddr), if_name(ifp))); 2742 } 2743 2744 static bool 2745 in6_lle_match_pub(struct lltable *llt, struct llentry *lle, void *farg) 2746 { 2747 return ((lle->la_flags & LLE_PUB) != 0); 2748 } 2749 2750 void 2751 in6_purge_proxy_ndp(struct ifnet *ifp) 2752 { 2753 struct lltable *llt; 2754 bool need_purge; 2755 2756 if (ifp->if_afdata[AF_INET6] == NULL) 2757 return; 2758 2759 llt = LLTABLE6(ifp); 2760 IF_AFDATA_WLOCK(ifp); 2761 need_purge = ((llt->llt_flags & LLT_ADDEDPROXY) != 0); 2762 IF_AFDATA_WUNLOCK(ifp); 2763 2764 /* 2765 * Ever added proxy ndp entries, leave solicited node multicast 2766 * before deleting the llentry. 2767 */ 2768 if (need_purge) 2769 lltable_delete_conditional(llt, in6_lle_match_pub, NULL); 2770 } 2771