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