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