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