in6.c revision 287732
1/*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $ 30 */ 31 32/*- 33 * Copyright (c) 1982, 1986, 1991, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 4. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)in.c 8.2 (Berkeley) 11/15/93 61 */ 62 63#include <sys/cdefs.h> 64__FBSDID("$FreeBSD: stable/10/sys/netinet6/in6.c 287732 2015-09-13 01:44:30Z hrs $"); 65 66#include "opt_compat.h" 67#include "opt_inet.h" 68#include "opt_inet6.h" 69 70#include <sys/param.h> 71#include <sys/errno.h> 72#include <sys/jail.h> 73#include <sys/malloc.h> 74#include <sys/socket.h> 75#include <sys/socketvar.h> 76#include <sys/sockio.h> 77#include <sys/systm.h> 78#include <sys/priv.h> 79#include <sys/proc.h> 80#include <sys/time.h> 81#include <sys/kernel.h> 82#include <sys/syslog.h> 83 84#include <net/if.h> 85#include <net/if_var.h> 86#include <net/if_types.h> 87#include <net/route.h> 88#include <net/if_dl.h> 89#include <net/vnet.h> 90 91#include <netinet/in.h> 92#include <netinet/in_var.h> 93#include <net/if_llatbl.h> 94#include <netinet/if_ether.h> 95#include <netinet/in_systm.h> 96#include <netinet/ip.h> 97#include <netinet/in_pcb.h> 98#include <netinet/ip_carp.h> 99 100#include <netinet/ip6.h> 101#include <netinet6/ip6_var.h> 102#include <netinet6/nd6.h> 103#include <netinet6/mld6_var.h> 104#include <netinet6/ip6_mroute.h> 105#include <netinet6/in6_ifattach.h> 106#include <netinet6/scope6_var.h> 107#include <netinet6/in6_pcb.h> 108 109VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix); 110#define V_icmp6_nodeinfo_oldmcprefix VNET(icmp6_nodeinfo_oldmcprefix) 111 112/* 113 * Definitions of some costant IP6 addresses. 114 */ 115const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 116const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 117const struct in6_addr in6addr_nodelocal_allnodes = 118 IN6ADDR_NODELOCAL_ALLNODES_INIT; 119const struct in6_addr in6addr_linklocal_allnodes = 120 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 121const struct in6_addr in6addr_linklocal_allrouters = 122 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 123const struct in6_addr in6addr_linklocal_allv2routers = 124 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT; 125 126const struct in6_addr in6mask0 = IN6MASK0; 127const struct in6_addr in6mask32 = IN6MASK32; 128const struct in6_addr in6mask64 = IN6MASK64; 129const struct in6_addr in6mask96 = IN6MASK96; 130const struct in6_addr in6mask128 = IN6MASK128; 131 132const struct sockaddr_in6 sa6_any = 133 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 }; 134 135static int in6_lifaddr_ioctl(struct socket *, u_long, caddr_t, 136 struct ifnet *, struct thread *); 137static int in6_ifinit(struct ifnet *, struct in6_ifaddr *, 138 struct sockaddr_in6 *, int); 139static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 140 141int (*faithprefix_p)(struct in6_addr *); 142 143#define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 144#define ia62ifa(ia6) (&((ia6)->ia_ifa)) 145 146void 147in6_ifaddloop(struct ifaddr *ifa) 148{ 149 struct sockaddr_dl gateway; 150 struct sockaddr_in6 mask, addr; 151 struct rtentry rt; 152 struct in6_ifaddr *ia; 153 struct ifnet *ifp; 154 struct llentry *ln; 155 156 ia = ifa2ia6(ifa); 157 ifp = ifa->ifa_ifp; 158 /* 159 * initialize for rtmsg generation 160 */ 161 bzero(&gateway, sizeof(gateway)); 162 gateway.sdl_len = sizeof(gateway); 163 gateway.sdl_family = AF_LINK; 164 if (nd6_need_cache(ifp) != 0) { 165 IF_AFDATA_LOCK(ifp); 166 ifa->ifa_rtrequest = nd6_rtrequest; 167 ln = lla_lookup(LLTABLE6(ifp), (LLE_CREATE | LLE_IFADDR | 168 LLE_EXCLUSIVE), (struct sockaddr *)&ia->ia_addr); 169 IF_AFDATA_UNLOCK(ifp); 170 if (ln != NULL) { 171 ln->la_expire = 0; /* for IPv6 this means permanent */ 172 ln->ln_state = ND6_LLINFO_REACHABLE; 173 174 gateway.sdl_alen = 6; 175 memcpy(gateway.sdl_data, &ln->ll_addr.mac_aligned, 176 sizeof(ln->ll_addr)); 177 LLE_WUNLOCK(ln); 178 } 179 } 180 bzero(&rt, sizeof(rt)); 181 rt.rt_gateway = (struct sockaddr *)&gateway; 182 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 183 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr)); 184 rt_mask(&rt) = (struct sockaddr *)&mask; 185 rt_key(&rt) = (struct sockaddr *)&addr; 186 rt.rt_flags = RTF_UP | RTF_HOST | RTF_STATIC; 187 /* Announce arrival of local address to all FIBs. */ 188 rt_newaddrmsg(RTM_ADD, ifa, 0, &rt); 189} 190 191void 192in6_ifremloop(struct ifaddr *ifa) 193{ 194 struct sockaddr_dl gateway; 195 struct sockaddr_in6 mask, addr; 196 struct rtentry rt0; 197 struct in6_ifaddr *ia; 198 struct ifnet *ifp; 199 200 ia = ifa2ia6(ifa); 201 ifp = ifa->ifa_ifp; 202 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr)); 203 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 204 lltable_prefix_free(AF_INET6, (struct sockaddr *)&addr, 205 (struct sockaddr *)&mask, LLE_STATIC); 206 207 /* 208 * initialize for rtmsg generation 209 */ 210 bzero(&gateway, sizeof(gateway)); 211 gateway.sdl_len = sizeof(gateway); 212 gateway.sdl_family = AF_LINK; 213 gateway.sdl_nlen = 0; 214 gateway.sdl_alen = ifp->if_addrlen; 215 bzero(&rt0, sizeof(rt0)); 216 rt0.rt_gateway = (struct sockaddr *)&gateway; 217 rt_mask(&rt0) = (struct sockaddr *)&mask; 218 rt_key(&rt0) = (struct sockaddr *)&addr; 219 rt0.rt_flags = RTF_HOST | RTF_STATIC; 220 /* Announce removal of local address to all FIBs. */ 221 rt_newaddrmsg(RTM_DELETE, ifa, 0, &rt0); 222} 223 224int 225in6_mask2len(struct in6_addr *mask, u_char *lim0) 226{ 227 int x = 0, y; 228 u_char *lim = lim0, *p; 229 230 /* ignore the scope_id part */ 231 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 232 lim = (u_char *)mask + sizeof(*mask); 233 for (p = (u_char *)mask; p < lim; x++, p++) { 234 if (*p != 0xff) 235 break; 236 } 237 y = 0; 238 if (p < lim) { 239 for (y = 0; y < 8; y++) { 240 if ((*p & (0x80 >> y)) == 0) 241 break; 242 } 243 } 244 245 /* 246 * when the limit pointer is given, do a stricter check on the 247 * remaining bits. 248 */ 249 if (p < lim) { 250 if (y != 0 && (*p & (0x00ff >> y)) != 0) 251 return (-1); 252 for (p = p + 1; p < lim; p++) 253 if (*p != 0) 254 return (-1); 255 } 256 257 return x * 8 + y; 258} 259 260#ifdef COMPAT_FREEBSD32 261struct in6_ndifreq32 { 262 char ifname[IFNAMSIZ]; 263 uint32_t ifindex; 264}; 265#define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32) 266#endif 267 268int 269in6_control(struct socket *so, u_long cmd, caddr_t data, 270 struct ifnet *ifp, struct thread *td) 271{ 272 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 273 struct in6_ifaddr *ia = NULL; 274 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 275 struct sockaddr_in6 *sa6; 276 int carp_attached = 0; 277 int error; 278 u_long ocmd = cmd; 279 280 /* 281 * Compat to make pre-10.x ifconfig(8) operable. 282 */ 283 if (cmd == OSIOCAIFADDR_IN6) 284 cmd = SIOCAIFADDR_IN6; 285 286 switch (cmd) { 287 case SIOCGETSGCNT_IN6: 288 case SIOCGETMIFCNT_IN6: 289 /* 290 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c. 291 * We cannot see how that would be needed, so do not adjust the 292 * KPI blindly; more likely should clean up the IPv4 variant. 293 */ 294 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP); 295 } 296 297 switch (cmd) { 298 case SIOCAADDRCTL_POLICY: 299 case SIOCDADDRCTL_POLICY: 300 if (td != NULL) { 301 error = priv_check(td, PRIV_NETINET_ADDRCTRL6); 302 if (error) 303 return (error); 304 } 305 return (in6_src_ioctl(cmd, data)); 306 } 307 308 if (ifp == NULL) 309 return (EOPNOTSUPP); 310 311 switch (cmd) { 312 case SIOCSNDFLUSH_IN6: 313 case SIOCSPFXFLUSH_IN6: 314 case SIOCSRTRFLUSH_IN6: 315 case SIOCSDEFIFACE_IN6: 316 case SIOCSIFINFO_FLAGS: 317 case SIOCSIFINFO_IN6: 318 if (td != NULL) { 319 error = priv_check(td, PRIV_NETINET_ND6); 320 if (error) 321 return (error); 322 } 323 /* FALLTHROUGH */ 324 case OSIOCGIFINFO_IN6: 325 case SIOCGIFINFO_IN6: 326 case SIOCGDRLST_IN6: 327 case SIOCGPRLST_IN6: 328 case SIOCGNBRINFO_IN6: 329 case SIOCGDEFIFACE_IN6: 330 return (nd6_ioctl(cmd, data, ifp)); 331 332#ifdef COMPAT_FREEBSD32 333 case SIOCGDEFIFACE32_IN6: 334 { 335 struct in6_ndifreq ndif; 336 struct in6_ndifreq32 *ndif32; 337 338 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif, 339 ifp); 340 if (error) 341 return (error); 342 ndif32 = (struct in6_ndifreq32 *)data; 343 ndif32->ifindex = ndif.ifindex; 344 return (0); 345 } 346#endif 347 } 348 349 switch (cmd) { 350 case SIOCSIFPREFIX_IN6: 351 case SIOCDIFPREFIX_IN6: 352 case SIOCAIFPREFIX_IN6: 353 case SIOCCIFPREFIX_IN6: 354 case SIOCSGIFPREFIX_IN6: 355 case SIOCGIFPREFIX_IN6: 356 log(LOG_NOTICE, 357 "prefix ioctls are now invalidated. " 358 "please use ifconfig.\n"); 359 return (EOPNOTSUPP); 360 } 361 362 switch (cmd) { 363 case SIOCSSCOPE6: 364 if (td != NULL) { 365 error = priv_check(td, PRIV_NETINET_SCOPE6); 366 if (error) 367 return (error); 368 } 369 /* FALLTHROUGH */ 370 case SIOCGSCOPE6: 371 case SIOCGSCOPE6DEF: 372 return (scope6_ioctl(cmd, data, ifp)); 373 } 374 375 switch (cmd) { 376 case SIOCALIFADDR: 377 if (td != NULL) { 378 error = priv_check(td, PRIV_NET_ADDIFADDR); 379 if (error) 380 return (error); 381 } 382 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 383 384 case SIOCDLIFADDR: 385 if (td != NULL) { 386 error = priv_check(td, PRIV_NET_DELIFADDR); 387 if (error) 388 return (error); 389 } 390 /* FALLTHROUGH */ 391 case SIOCGLIFADDR: 392 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 393 } 394 395 /* 396 * Find address for this interface, if it exists. 397 * 398 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 399 * only, and used the first interface address as the target of other 400 * operations (without checking ifra_addr). This was because netinet 401 * code/API assumed at most 1 interface address per interface. 402 * Since IPv6 allows a node to assign multiple addresses 403 * on a single interface, we almost always look and check the 404 * presence of ifra_addr, and reject invalid ones here. 405 * It also decreases duplicated code among SIOC*_IN6 operations. 406 */ 407 switch (cmd) { 408 case SIOCAIFADDR_IN6: 409 case SIOCSIFPHYADDR_IN6: 410 sa6 = &ifra->ifra_addr; 411 break; 412 case SIOCSIFADDR_IN6: 413 case SIOCGIFADDR_IN6: 414 case SIOCSIFDSTADDR_IN6: 415 case SIOCSIFNETMASK_IN6: 416 case SIOCGIFDSTADDR_IN6: 417 case SIOCGIFNETMASK_IN6: 418 case SIOCDIFADDR_IN6: 419 case SIOCGIFPSRCADDR_IN6: 420 case SIOCGIFPDSTADDR_IN6: 421 case SIOCGIFAFLAG_IN6: 422 case SIOCSNDFLUSH_IN6: 423 case SIOCSPFXFLUSH_IN6: 424 case SIOCSRTRFLUSH_IN6: 425 case SIOCGIFALIFETIME_IN6: 426 case SIOCSIFALIFETIME_IN6: 427 case SIOCGIFSTAT_IN6: 428 case SIOCGIFSTAT_ICMP6: 429 sa6 = &ifr->ifr_addr; 430 break; 431 case SIOCSIFADDR: 432 case SIOCSIFBRDADDR: 433 case SIOCSIFDSTADDR: 434 case SIOCSIFNETMASK: 435 /* 436 * Although we should pass any non-INET6 ioctl requests 437 * down to driver, we filter some legacy INET requests. 438 * Drivers trust SIOCSIFADDR et al to come from an already 439 * privileged layer, and do not perform any credentials 440 * checks or input validation. 441 */ 442 return (EINVAL); 443 default: 444 sa6 = NULL; 445 break; 446 } 447 if (sa6 && sa6->sin6_family == AF_INET6) { 448 if (sa6->sin6_scope_id != 0) 449 error = sa6_embedscope(sa6, 0); 450 else 451 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 452 if (error != 0) 453 return (error); 454 if (td != NULL && (error = prison_check_ip6(td->td_ucred, 455 &sa6->sin6_addr)) != 0) 456 return (error); 457 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 458 } else 459 ia = NULL; 460 461 switch (cmd) { 462 case SIOCSIFADDR_IN6: 463 case SIOCSIFDSTADDR_IN6: 464 case SIOCSIFNETMASK_IN6: 465 /* 466 * Since IPv6 allows a node to assign multiple addresses 467 * on a single interface, SIOCSIFxxx ioctls are deprecated. 468 */ 469 /* we decided to obsolete this command (20000704) */ 470 error = EINVAL; 471 goto out; 472 473 case SIOCDIFADDR_IN6: 474 /* 475 * for IPv4, we look for existing in_ifaddr here to allow 476 * "ifconfig if0 delete" to remove the first IPv4 address on 477 * the interface. For IPv6, as the spec allows multiple 478 * interface address from the day one, we consider "remove the 479 * first one" semantics to be not preferable. 480 */ 481 if (ia == NULL) { 482 error = EADDRNOTAVAIL; 483 goto out; 484 } 485 /* FALLTHROUGH */ 486 case SIOCAIFADDR_IN6: 487 /* 488 * We always require users to specify a valid IPv6 address for 489 * the corresponding operation. 490 */ 491 if (ifra->ifra_addr.sin6_family != AF_INET6 || 492 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 493 error = EAFNOSUPPORT; 494 goto out; 495 } 496 497 if (td != NULL) { 498 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 499 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR); 500 if (error) 501 goto out; 502 } 503 /* FALLTHROUGH */ 504 case SIOCGIFSTAT_IN6: 505 case SIOCGIFSTAT_ICMP6: 506 if (ifp->if_afdata[AF_INET6] == NULL) { 507 error = EPFNOSUPPORT; 508 goto out; 509 } 510 break; 511 512 case SIOCGIFADDR_IN6: 513 /* This interface is basically deprecated. use SIOCGIFCONF. */ 514 /* FALLTHROUGH */ 515 case SIOCGIFAFLAG_IN6: 516 case SIOCGIFNETMASK_IN6: 517 case SIOCGIFDSTADDR_IN6: 518 case SIOCGIFALIFETIME_IN6: 519 /* must think again about its semantics */ 520 if (ia == NULL) { 521 error = EADDRNOTAVAIL; 522 goto out; 523 } 524 break; 525 526 case SIOCSIFALIFETIME_IN6: 527 { 528 struct in6_addrlifetime *lt; 529 530 if (td != NULL) { 531 error = priv_check(td, PRIV_NETINET_ALIFETIME6); 532 if (error) 533 goto out; 534 } 535 if (ia == NULL) { 536 error = EADDRNOTAVAIL; 537 goto out; 538 } 539 /* sanity for overflow - beware unsigned */ 540 lt = &ifr->ifr_ifru.ifru_lifetime; 541 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME && 542 lt->ia6t_vltime + time_uptime < time_uptime) { 543 error = EINVAL; 544 goto out; 545 } 546 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME && 547 lt->ia6t_pltime + time_uptime < time_uptime) { 548 error = EINVAL; 549 goto out; 550 } 551 break; 552 } 553 } 554 555 switch (cmd) { 556 case SIOCGIFADDR_IN6: 557 ifr->ifr_addr = ia->ia_addr; 558 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 559 goto out; 560 break; 561 562 case SIOCGIFDSTADDR_IN6: 563 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 564 error = EINVAL; 565 goto out; 566 } 567 /* 568 * XXX: should we check if ifa_dstaddr is NULL and return 569 * an error? 570 */ 571 ifr->ifr_dstaddr = ia->ia_dstaddr; 572 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 573 goto out; 574 break; 575 576 case SIOCGIFNETMASK_IN6: 577 ifr->ifr_addr = ia->ia_prefixmask; 578 break; 579 580 case SIOCGIFAFLAG_IN6: 581 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 582 break; 583 584 case SIOCGIFSTAT_IN6: 585 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 586 ifp->if_afdata[AF_INET6])->in6_ifstat, 587 &ifr->ifr_ifru.ifru_stat, 588 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 589 break; 590 591 case SIOCGIFSTAT_ICMP6: 592 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 593 ifp->if_afdata[AF_INET6])->icmp6_ifstat, 594 &ifr->ifr_ifru.ifru_icmp6stat, 595 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 596 break; 597 598 case SIOCGIFALIFETIME_IN6: 599 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 600 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 601 time_t maxexpire; 602 struct in6_addrlifetime *retlt = 603 &ifr->ifr_ifru.ifru_lifetime; 604 605 /* 606 * XXX: adjust expiration time assuming time_t is 607 * signed. 608 */ 609 maxexpire = (-1) & 610 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 611 if (ia->ia6_lifetime.ia6t_vltime < 612 maxexpire - ia->ia6_updatetime) { 613 retlt->ia6t_expire = ia->ia6_updatetime + 614 ia->ia6_lifetime.ia6t_vltime; 615 } else 616 retlt->ia6t_expire = maxexpire; 617 } 618 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 619 time_t maxexpire; 620 struct in6_addrlifetime *retlt = 621 &ifr->ifr_ifru.ifru_lifetime; 622 623 /* 624 * XXX: adjust expiration time assuming time_t is 625 * signed. 626 */ 627 maxexpire = (-1) & 628 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 629 if (ia->ia6_lifetime.ia6t_pltime < 630 maxexpire - ia->ia6_updatetime) { 631 retlt->ia6t_preferred = ia->ia6_updatetime + 632 ia->ia6_lifetime.ia6t_pltime; 633 } else 634 retlt->ia6t_preferred = maxexpire; 635 } 636 break; 637 638 case SIOCSIFALIFETIME_IN6: 639 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; 640 /* for sanity */ 641 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 642 ia->ia6_lifetime.ia6t_expire = 643 time_uptime + ia->ia6_lifetime.ia6t_vltime; 644 } else 645 ia->ia6_lifetime.ia6t_expire = 0; 646 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 647 ia->ia6_lifetime.ia6t_preferred = 648 time_uptime + ia->ia6_lifetime.ia6t_pltime; 649 } else 650 ia->ia6_lifetime.ia6t_preferred = 0; 651 break; 652 653 case SIOCAIFADDR_IN6: 654 { 655 int i; 656 struct nd_prefixctl pr0; 657 struct nd_prefix *pr; 658 659 /* 660 * first, make or update the interface address structure, 661 * and link it to the list. 662 */ 663 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 664 goto out; 665 if (ia != NULL) 666 ifa_free(&ia->ia_ifa); 667 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 668 == NULL) { 669 /* 670 * this can happen when the user specify the 0 valid 671 * lifetime. 672 */ 673 break; 674 } 675 676 if (cmd == ocmd && ifra->ifra_vhid > 0) { 677 if (carp_attach_p != NULL) 678 error = (*carp_attach_p)(&ia->ia_ifa, 679 ifra->ifra_vhid); 680 else 681 error = EPROTONOSUPPORT; 682 if (error) 683 goto out; 684 else 685 carp_attached = 1; 686 } 687 688 /* 689 * then, make the prefix on-link on the interface. 690 * XXX: we'd rather create the prefix before the address, but 691 * we need at least one address to install the corresponding 692 * interface route, so we configure the address first. 693 */ 694 695 /* 696 * convert mask to prefix length (prefixmask has already 697 * been validated in in6_update_ifa(). 698 */ 699 bzero(&pr0, sizeof(pr0)); 700 pr0.ndpr_ifp = ifp; 701 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 702 NULL); 703 if (pr0.ndpr_plen == 128) { 704 /* we don't need to install a host route. */ 705 goto aifaddr_out; 706 } 707 pr0.ndpr_prefix = ifra->ifra_addr; 708 /* apply the mask for safety. */ 709 for (i = 0; i < 4; i++) { 710 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 711 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i]; 712 } 713 /* 714 * XXX: since we don't have an API to set prefix (not address) 715 * lifetimes, we just use the same lifetimes as addresses. 716 * The (temporarily) installed lifetimes can be overridden by 717 * later advertised RAs (when accept_rtadv is non 0), which is 718 * an intended behavior. 719 */ 720 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 721 pr0.ndpr_raf_auto = 722 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 723 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 724 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 725 726 /* add the prefix if not yet. */ 727 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 728 /* 729 * nd6_prelist_add will install the corresponding 730 * interface route. 731 */ 732 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) { 733 if (carp_attached) 734 (*carp_detach_p)(&ia->ia_ifa); 735 goto out; 736 } 737 if (pr == NULL) { 738 if (carp_attached) 739 (*carp_detach_p)(&ia->ia_ifa); 740 log(LOG_ERR, "nd6_prelist_add succeeded but " 741 "no prefix\n"); 742 error = EINVAL; 743 goto out; 744 } 745 } 746 747 /* relate the address to the prefix */ 748 if (ia->ia6_ndpr == NULL) { 749 ia->ia6_ndpr = pr; 750 pr->ndpr_refcnt++; 751 752 /* 753 * If this is the first autoconf address from the 754 * prefix, create a temporary address as well 755 * (when required). 756 */ 757 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 758 V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) { 759 int e; 760 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 761 log(LOG_NOTICE, "in6_control: failed " 762 "to create a temporary address, " 763 "errno=%d\n", e); 764 } 765 } 766 } 767 768 /* 769 * this might affect the status of autoconfigured addresses, 770 * that is, this address might make other addresses detached. 771 */ 772 pfxlist_onlink_check(); 773aifaddr_out: 774 if (error != 0 || ia == NULL) 775 break; 776 /* 777 * Try to clear the flag when a new IPv6 address is added 778 * onto an IFDISABLED interface and it succeeds. 779 */ 780 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) { 781 struct in6_ndireq nd; 782 783 memset(&nd, 0, sizeof(nd)); 784 nd.ndi.flags = ND_IFINFO(ifp)->flags; 785 nd.ndi.flags &= ~ND6_IFF_IFDISABLED; 786 if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0) 787 log(LOG_NOTICE, "SIOCAIFADDR_IN6: " 788 "SIOCSIFINFO_FLAGS for -ifdisabled " 789 "failed."); 790 /* 791 * Ignore failure of clearing the flag intentionally. 792 * The failure means address duplication was detected. 793 */ 794 } 795 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 796 break; 797 } 798 799 case SIOCDIFADDR_IN6: 800 { 801 struct nd_prefix *pr; 802 803 /* 804 * If the address being deleted is the only one that owns 805 * the corresponding prefix, expire the prefix as well. 806 * XXX: theoretically, we don't have to worry about such 807 * relationship, since we separate the address management 808 * and the prefix management. We do this, however, to provide 809 * as much backward compatibility as possible in terms of 810 * the ioctl operation. 811 * Note that in6_purgeaddr() will decrement ndpr_refcnt. 812 */ 813 pr = ia->ia6_ndpr; 814 in6_purgeaddr(&ia->ia_ifa); 815 if (pr && pr->ndpr_refcnt == 0) 816 prelist_remove(pr); 817 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 818 break; 819 } 820 821 default: 822 if (ifp->if_ioctl == NULL) { 823 error = EOPNOTSUPP; 824 goto out; 825 } 826 error = (*ifp->if_ioctl)(ifp, cmd, data); 827 goto out; 828 } 829 830 error = 0; 831out: 832 if (ia != NULL) 833 ifa_free(&ia->ia_ifa); 834 return (error); 835} 836 837 838/* 839 * Join necessary multicast groups. Factored out from in6_update_ifa(). 840 * This entire work should only be done once, for the default FIB. 841 */ 842static int 843in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra, 844 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol) 845{ 846 char ip6buf[INET6_ADDRSTRLEN]; 847 struct sockaddr_in6 mltaddr, mltmask; 848 struct in6_addr llsol; 849 struct in6_multi_mship *imm; 850 struct rtentry *rt; 851 int delay, error; 852 853 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__)); 854 855 /* Join solicited multicast addr for new host id. */ 856 bzero(&llsol, sizeof(struct in6_addr)); 857 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL; 858 llsol.s6_addr32[1] = 0; 859 llsol.s6_addr32[2] = htonl(1); 860 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 861 llsol.s6_addr8[12] = 0xff; 862 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) { 863 /* XXX: should not happen */ 864 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 865 goto cleanup; 866 } 867 delay = 0; 868 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 869 /* 870 * We need a random delay for DAD on the address being 871 * configured. It also means delaying transmission of the 872 * corresponding MLD report to avoid report collision. 873 * [RFC 4861, Section 6.3.7] 874 */ 875 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 876 } 877 imm = in6_joingroup(ifp, &llsol, &error, delay); 878 if (imm == NULL) { 879 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 880 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &llsol), 881 if_name(ifp), error)); 882 goto cleanup; 883 } 884 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 885 *in6m_sol = imm->i6mm_maddr; 886 887 bzero(&mltmask, sizeof(mltmask)); 888 mltmask.sin6_len = sizeof(struct sockaddr_in6); 889 mltmask.sin6_family = AF_INET6; 890 mltmask.sin6_addr = in6mask32; 891#define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */ 892 893 /* 894 * Join link-local all-nodes address. 895 */ 896 bzero(&mltaddr, sizeof(mltaddr)); 897 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 898 mltaddr.sin6_family = AF_INET6; 899 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 900 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 901 goto cleanup; /* XXX: should not fail */ 902 903 /* 904 * XXX: do we really need this automatic routes? We should probably 905 * reconsider this stuff. Most applications actually do not need the 906 * routes, since they usually specify the outgoing interface. 907 */ 908 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 909 if (rt != NULL) { 910 /* XXX: only works in !SCOPEDROUTING case. */ 911 if (memcmp(&mltaddr.sin6_addr, 912 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, 913 MLTMASK_LEN)) { 914 RTFREE_LOCKED(rt); 915 rt = NULL; 916 } 917 } 918 if (rt == NULL) { 919 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr, 920 (struct sockaddr *)&ia->ia_addr, 921 (struct sockaddr *)&mltmask, RTF_UP, 922 (struct rtentry **)0, RT_DEFAULT_FIB); 923 if (error) 924 goto cleanup; 925 } else 926 RTFREE_LOCKED(rt); 927 928 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 929 if (imm == NULL) { 930 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 931 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 932 &mltaddr.sin6_addr), if_name(ifp), error)); 933 goto cleanup; 934 } 935 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 936 937 /* 938 * Join node information group address. 939 */ 940 delay = 0; 941 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 942 /* 943 * The spec does not say anything about delay for this group, 944 * but the same logic should apply. 945 */ 946 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 947 } 948 if (in6_nigroup(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) { 949 /* XXX jinmei */ 950 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay); 951 if (imm == NULL) 952 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 953 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 954 &mltaddr.sin6_addr), if_name(ifp), error)); 955 /* XXX not very fatal, go on... */ 956 else 957 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 958 } 959 if (V_icmp6_nodeinfo_oldmcprefix && 960 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) { 961 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay); 962 if (imm == NULL) 963 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 964 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 965 &mltaddr.sin6_addr), if_name(ifp), error)); 966 /* XXX not very fatal, go on... */ 967 else 968 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 969 } 970 971 /* 972 * Join interface-local all-nodes address. 973 * (ff01::1%ifN, and ff01::%ifN/32) 974 */ 975 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 976 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 977 goto cleanup; /* XXX: should not fail */ 978 /* XXX: again, do we really need the route? */ 979 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 980 if (rt != NULL) { 981 if (memcmp(&mltaddr.sin6_addr, 982 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, 983 MLTMASK_LEN)) { 984 RTFREE_LOCKED(rt); 985 rt = NULL; 986 } 987 } 988 if (rt == NULL) { 989 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr, 990 (struct sockaddr *)&ia->ia_addr, 991 (struct sockaddr *)&mltmask, RTF_UP, 992 (struct rtentry **)0, RT_DEFAULT_FIB); 993 if (error) 994 goto cleanup; 995 } else 996 RTFREE_LOCKED(rt); 997 998 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 999 if (imm == NULL) { 1000 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 1001 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 1002 &mltaddr.sin6_addr), if_name(ifp), error)); 1003 goto cleanup; 1004 } 1005 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1006#undef MLTMASK_LEN 1007 1008cleanup: 1009 return (error); 1010} 1011 1012/* 1013 * Update parameters of an IPv6 interface address. 1014 * If necessary, a new entry is created and linked into address chains. 1015 * This function is separated from in6_control(). 1016 */ 1017int 1018in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1019 struct in6_ifaddr *ia, int flags) 1020{ 1021 int error = 0, hostIsNew = 0, plen = -1; 1022 struct sockaddr_in6 dst6; 1023 struct in6_addrlifetime *lt; 1024 struct in6_multi *in6m_sol; 1025 int delay; 1026 char ip6buf[INET6_ADDRSTRLEN]; 1027 1028 /* Validate parameters */ 1029 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 1030 return (EINVAL); 1031 1032 /* 1033 * The destination address for a p2p link must have a family 1034 * of AF_UNSPEC or AF_INET6. 1035 */ 1036 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 1037 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 1038 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 1039 return (EAFNOSUPPORT); 1040 /* 1041 * validate ifra_prefixmask. don't check sin6_family, netmask 1042 * does not carry fields other than sin6_len. 1043 */ 1044 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 1045 return (EINVAL); 1046 /* 1047 * Because the IPv6 address architecture is classless, we require 1048 * users to specify a (non 0) prefix length (mask) for a new address. 1049 * We also require the prefix (when specified) mask is valid, and thus 1050 * reject a non-consecutive mask. 1051 */ 1052 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 1053 return (EINVAL); 1054 if (ifra->ifra_prefixmask.sin6_len != 0) { 1055 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 1056 (u_char *)&ifra->ifra_prefixmask + 1057 ifra->ifra_prefixmask.sin6_len); 1058 if (plen <= 0) 1059 return (EINVAL); 1060 } else { 1061 /* 1062 * In this case, ia must not be NULL. We just use its prefix 1063 * length. 1064 */ 1065 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1066 } 1067 /* 1068 * If the destination address on a p2p interface is specified, 1069 * and the address is a scoped one, validate/set the scope 1070 * zone identifier. 1071 */ 1072 dst6 = ifra->ifra_dstaddr; 1073 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 1074 (dst6.sin6_family == AF_INET6)) { 1075 struct in6_addr in6_tmp; 1076 u_int32_t zoneid; 1077 1078 in6_tmp = dst6.sin6_addr; 1079 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 1080 return (EINVAL); /* XXX: should be impossible */ 1081 1082 if (dst6.sin6_scope_id != 0) { 1083 if (dst6.sin6_scope_id != zoneid) 1084 return (EINVAL); 1085 } else /* user omit to specify the ID. */ 1086 dst6.sin6_scope_id = zoneid; 1087 1088 /* convert into the internal form */ 1089 if (sa6_embedscope(&dst6, 0)) 1090 return (EINVAL); /* XXX: should be impossible */ 1091 } 1092 /* 1093 * The destination address can be specified only for a p2p or a 1094 * loopback interface. If specified, the corresponding prefix length 1095 * must be 128. 1096 */ 1097 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 1098 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 1099 /* XXX: noisy message */ 1100 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 1101 "be specified for a p2p or a loopback IF only\n")); 1102 return (EINVAL); 1103 } 1104 if (plen != 128) { 1105 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 1106 "be 128 when dstaddr is specified\n")); 1107 return (EINVAL); 1108 } 1109 } 1110 /* lifetime consistency check */ 1111 lt = &ifra->ifra_lifetime; 1112 if (lt->ia6t_pltime > lt->ia6t_vltime) 1113 return (EINVAL); 1114 if (lt->ia6t_vltime == 0) { 1115 /* 1116 * the following log might be noisy, but this is a typical 1117 * configuration mistake or a tool's bug. 1118 */ 1119 nd6log((LOG_INFO, 1120 "in6_update_ifa: valid lifetime is 0 for %s\n", 1121 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr))); 1122 1123 if (ia == NULL) 1124 return (0); /* there's nothing to do */ 1125 } 1126 1127 /* 1128 * If this is a new address, allocate a new ifaddr and link it 1129 * into chains. 1130 */ 1131 if (ia == NULL) { 1132 hostIsNew = 1; 1133 /* 1134 * When in6_update_ifa() is called in a process of a received 1135 * RA, it is called under an interrupt context. So, we should 1136 * call malloc with M_NOWAIT. 1137 */ 1138 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR, 1139 M_NOWAIT); 1140 if (ia == NULL) 1141 return (ENOBUFS); 1142 bzero((caddr_t)ia, sizeof(*ia)); 1143 ifa_init(&ia->ia_ifa); 1144 LIST_INIT(&ia->ia6_memberships); 1145 /* Initialize the address and masks, and put time stamp */ 1146 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1147 ia->ia_addr.sin6_family = AF_INET6; 1148 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 1149 ia->ia6_createtime = time_uptime; 1150 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1151 /* 1152 * XXX: some functions expect that ifa_dstaddr is not 1153 * NULL for p2p interfaces. 1154 */ 1155 ia->ia_ifa.ifa_dstaddr = 1156 (struct sockaddr *)&ia->ia_dstaddr; 1157 } else { 1158 ia->ia_ifa.ifa_dstaddr = NULL; 1159 } 1160 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 1161 ia->ia_ifp = ifp; 1162 ifa_ref(&ia->ia_ifa); /* if_addrhead */ 1163 IF_ADDR_WLOCK(ifp); 1164 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1165 IF_ADDR_WUNLOCK(ifp); 1166 1167 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */ 1168 IN6_IFADDR_WLOCK(); 1169 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link); 1170 LIST_INSERT_HEAD(IN6ADDR_HASH(&ifra->ifra_addr.sin6_addr), 1171 ia, ia6_hash); 1172 IN6_IFADDR_WUNLOCK(); 1173 } 1174 1175 /* update timestamp */ 1176 ia->ia6_updatetime = time_uptime; 1177 1178 /* set prefix mask */ 1179 if (ifra->ifra_prefixmask.sin6_len) { 1180 /* 1181 * We prohibit changing the prefix length of an existing 1182 * address, because 1183 * + such an operation should be rare in IPv6, and 1184 * + the operation would confuse prefix management. 1185 */ 1186 if (ia->ia_prefixmask.sin6_len && 1187 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 1188 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an" 1189 " existing (%s) address should not be changed\n", 1190 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1191 error = EINVAL; 1192 goto unlink; 1193 } 1194 ia->ia_prefixmask = ifra->ifra_prefixmask; 1195 ia->ia_prefixmask.sin6_family = AF_INET6; 1196 } 1197 1198 /* 1199 * If a new destination address is specified, scrub the old one and 1200 * install the new destination. Note that the interface must be 1201 * p2p or loopback (see the check above.) 1202 */ 1203 if (dst6.sin6_family == AF_INET6 && 1204 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1205 int e; 1206 1207 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1208 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) { 1209 nd6log((LOG_ERR, "in6_update_ifa: failed to remove " 1210 "a route to the old destination: %s\n", 1211 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1212 /* proceed anyway... */ 1213 } else 1214 ia->ia_flags &= ~IFA_ROUTE; 1215 ia->ia_dstaddr = dst6; 1216 } 1217 1218 /* 1219 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1220 * to see if the address is deprecated or invalidated, but initialize 1221 * these members for applications. 1222 */ 1223 ia->ia6_lifetime = ifra->ifra_lifetime; 1224 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1225 ia->ia6_lifetime.ia6t_expire = 1226 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1227 } else 1228 ia->ia6_lifetime.ia6t_expire = 0; 1229 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1230 ia->ia6_lifetime.ia6t_preferred = 1231 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1232 } else 1233 ia->ia6_lifetime.ia6t_preferred = 0; 1234 1235 /* reset the interface and routing table appropriately. */ 1236 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 1237 goto unlink; 1238 1239 /* 1240 * configure address flags. 1241 */ 1242 ia->ia6_flags = ifra->ifra_flags; 1243 /* 1244 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1245 * userland, make it deprecated. 1246 */ 1247 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1248 ia->ia6_lifetime.ia6t_pltime = 0; 1249 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1250 } 1251 /* 1252 * Make the address tentative before joining multicast addresses, 1253 * so that corresponding MLD responses would not have a tentative 1254 * source address. 1255 */ 1256 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1257 1258 /* 1259 * DAD should be performed for an new address or addresses on 1260 * an interface with ND6_IFF_IFDISABLED. 1261 */ 1262 if (in6if_do_dad(ifp) && 1263 (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED))) 1264 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1265 1266 /* 1267 * We are done if we have simply modified an existing address. 1268 */ 1269 if (!hostIsNew) 1270 return (error); 1271 1272 /* 1273 * Beyond this point, we should call in6_purgeaddr upon an error, 1274 * not just go to unlink. 1275 */ 1276 1277 /* Join necessary multicast groups. */ 1278 in6m_sol = NULL; 1279 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1280 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol); 1281 if (error) 1282 goto cleanup; 1283 } 1284 1285 /* 1286 * Perform DAD, if needed. 1287 * XXX It may be of use, if we can administratively disable DAD. 1288 */ 1289 if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && 1290 (ia->ia6_flags & IN6_IFF_TENTATIVE)) 1291 { 1292 int mindelay, maxdelay; 1293 1294 delay = 0; 1295 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1296 /* 1297 * We need to impose a delay before sending an NS 1298 * for DAD. Check if we also needed a delay for the 1299 * corresponding MLD message. If we did, the delay 1300 * should be larger than the MLD delay (this could be 1301 * relaxed a bit, but this simple logic is at least 1302 * safe). 1303 * XXX: Break data hiding guidelines and look at 1304 * state for the solicited multicast group. 1305 */ 1306 mindelay = 0; 1307 if (in6m_sol != NULL && 1308 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) { 1309 mindelay = in6m_sol->in6m_timer; 1310 } 1311 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1312 if (maxdelay - mindelay == 0) 1313 delay = 0; 1314 else { 1315 delay = 1316 (arc4random() % (maxdelay - mindelay)) + 1317 mindelay; 1318 } 1319 } 1320 nd6_dad_start((struct ifaddr *)ia, delay); 1321 } 1322 1323 KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew")); 1324 ifa_free(&ia->ia_ifa); 1325 return (error); 1326 1327 unlink: 1328 /* 1329 * XXX: if a change of an existing address failed, keep the entry 1330 * anyway. 1331 */ 1332 if (hostIsNew) { 1333 in6_unlink_ifa(ia, ifp); 1334 ifa_free(&ia->ia_ifa); 1335 } 1336 return (error); 1337 1338 cleanup: 1339 KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew")); 1340 ifa_free(&ia->ia_ifa); 1341 in6_purgeaddr(&ia->ia_ifa); 1342 return error; 1343} 1344 1345/* 1346 * Leave multicast groups. Factored out from in6_purgeaddr(). 1347 * This entire work should only be done once, for the default FIB. 1348 */ 1349static int 1350in6_purgeaddr_mc(struct ifnet *ifp, struct in6_ifaddr *ia, struct ifaddr *ifa0) 1351{ 1352 struct sockaddr_in6 mltaddr, mltmask; 1353 struct in6_multi_mship *imm; 1354 struct rtentry *rt; 1355 struct sockaddr_in6 sin6; 1356 int error; 1357 1358 /* 1359 * Leave from multicast groups we have joined for the interface. 1360 */ 1361 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1362 LIST_REMOVE(imm, i6mm_chain); 1363 in6_leavegroup(imm); 1364 } 1365 1366 /* 1367 * Remove the link-local all-nodes address. 1368 */ 1369 bzero(&mltmask, sizeof(mltmask)); 1370 mltmask.sin6_len = sizeof(struct sockaddr_in6); 1371 mltmask.sin6_family = AF_INET6; 1372 mltmask.sin6_addr = in6mask32; 1373 1374 bzero(&mltaddr, sizeof(mltaddr)); 1375 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 1376 mltaddr.sin6_family = AF_INET6; 1377 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 1378 1379 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1380 return (error); 1381 1382 /* 1383 * As for the mltaddr above, proactively prepare the sin6 to avoid 1384 * rtentry un- and re-locking. 1385 */ 1386 if (ifa0 != NULL) { 1387 bzero(&sin6, sizeof(sin6)); 1388 sin6.sin6_len = sizeof(sin6); 1389 sin6.sin6_family = AF_INET6; 1390 memcpy(&sin6.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, 1391 sizeof(sin6.sin6_addr)); 1392 error = in6_setscope(&sin6.sin6_addr, ifa0->ifa_ifp, NULL); 1393 if (error != 0) 1394 return (error); 1395 } 1396 1397 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 1398 if (rt != NULL && rt->rt_gateway != NULL && 1399 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 1400 &ia->ia_addr.sin6_addr, 1401 sizeof(ia->ia_addr.sin6_addr)) == 0)) { 1402 /* 1403 * If no more IPv6 address exists on this interface then 1404 * remove the multicast address route. 1405 */ 1406 if (ifa0 == NULL) { 1407 memcpy(&mltaddr.sin6_addr, 1408 &satosin6(rt_key(rt))->sin6_addr, 1409 sizeof(mltaddr.sin6_addr)); 1410 RTFREE_LOCKED(rt); 1411 error = in6_rtrequest(RTM_DELETE, 1412 (struct sockaddr *)&mltaddr, 1413 (struct sockaddr *)&ia->ia_addr, 1414 (struct sockaddr *)&mltmask, RTF_UP, 1415 (struct rtentry **)0, RT_DEFAULT_FIB); 1416 if (error) 1417 log(LOG_INFO, "%s: link-local all-nodes " 1418 "multicast address deletion error\n", 1419 __func__); 1420 } else { 1421 /* 1422 * Replace the gateway of the route. 1423 */ 1424 memcpy(rt->rt_gateway, &sin6, sizeof(sin6)); 1425 RTFREE_LOCKED(rt); 1426 } 1427 } else { 1428 if (rt != NULL) 1429 RTFREE_LOCKED(rt); 1430 } 1431 1432 /* 1433 * Remove the node-local all-nodes address. 1434 */ 1435 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1436 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1437 return (error); 1438 1439 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 1440 if (rt != NULL && rt->rt_gateway != NULL && 1441 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 1442 &ia->ia_addr.sin6_addr, 1443 sizeof(ia->ia_addr.sin6_addr)) == 0)) { 1444 /* 1445 * If no more IPv6 address exists on this interface then 1446 * remove the multicast address route. 1447 */ 1448 if (ifa0 == NULL) { 1449 memcpy(&mltaddr.sin6_addr, 1450 &satosin6(rt_key(rt))->sin6_addr, 1451 sizeof(mltaddr.sin6_addr)); 1452 1453 RTFREE_LOCKED(rt); 1454 error = in6_rtrequest(RTM_DELETE, 1455 (struct sockaddr *)&mltaddr, 1456 (struct sockaddr *)&ia->ia_addr, 1457 (struct sockaddr *)&mltmask, RTF_UP, 1458 (struct rtentry **)0, RT_DEFAULT_FIB); 1459 if (error) 1460 log(LOG_INFO, "%s: node-local all-nodes" 1461 "multicast address deletion error\n", 1462 __func__); 1463 } else { 1464 /* 1465 * Replace the gateway of the route. 1466 */ 1467 memcpy(rt->rt_gateway, &sin6, sizeof(sin6)); 1468 RTFREE_LOCKED(rt); 1469 } 1470 } else { 1471 if (rt != NULL) 1472 RTFREE_LOCKED(rt); 1473 } 1474 1475 return (0); 1476} 1477 1478void 1479in6_purgeaddr(struct ifaddr *ifa) 1480{ 1481 struct ifnet *ifp = ifa->ifa_ifp; 1482 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1483 int plen, error; 1484 struct ifaddr *ifa0; 1485 1486 if (ifa->ifa_carp) 1487 (*carp_detach_p)(ifa); 1488 1489 /* 1490 * find another IPv6 address as the gateway for the 1491 * link-local and node-local all-nodes multicast 1492 * address routes 1493 */ 1494 IF_ADDR_RLOCK(ifp); 1495 TAILQ_FOREACH(ifa0, &ifp->if_addrhead, ifa_link) { 1496 if ((ifa0->ifa_addr->sa_family != AF_INET6) || 1497 memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr, 1498 &ia->ia_addr.sin6_addr, sizeof(struct in6_addr)) == 0) 1499 continue; 1500 else 1501 break; 1502 } 1503 if (ifa0 != NULL) 1504 ifa_ref(ifa0); 1505 IF_ADDR_RUNLOCK(ifp); 1506 1507 /* 1508 * Remove the loopback route to the interface address. 1509 * The check for the current setting of "nd6_useloopback" 1510 * is not needed. 1511 */ 1512 if (ia->ia_flags & IFA_RTSELF) { 1513 error = ifa_del_loopback_route((struct ifaddr *)ia, 1514 (struct sockaddr *)&ia->ia_addr); 1515 if (error == 0) 1516 ia->ia_flags &= ~IFA_RTSELF; 1517 } 1518 1519 /* stop DAD processing */ 1520 nd6_dad_stop(ifa); 1521 1522 /* Remove local address entry from lltable. */ 1523 in6_ifremloop(ifa); 1524 1525 /* Leave multicast groups. */ 1526 error = in6_purgeaddr_mc(ifp, ia, ifa0); 1527 1528 if (ifa0 != NULL) 1529 ifa_free(ifa0); 1530 1531 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1532 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) { 1533 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags | 1534 (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0); 1535 if (error != 0) 1536 log(LOG_INFO, "%s: err=%d, destination address delete " 1537 "failed\n", __func__, error); 1538 ia->ia_flags &= ~IFA_ROUTE; 1539 } 1540 1541 in6_unlink_ifa(ia, ifp); 1542} 1543 1544static void 1545in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1546{ 1547 char ip6buf[INET6_ADDRSTRLEN]; 1548 1549 IF_ADDR_WLOCK(ifp); 1550 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1551 IF_ADDR_WUNLOCK(ifp); 1552 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1553 1554 /* 1555 * Defer the release of what might be the last reference to the 1556 * in6_ifaddr so that it can't be freed before the remainder of the 1557 * cleanup. 1558 */ 1559 IN6_IFADDR_WLOCK(); 1560 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 1561 LIST_REMOVE(ia, ia6_hash); 1562 IN6_IFADDR_WUNLOCK(); 1563 1564 /* 1565 * Release the reference to the base prefix. There should be a 1566 * positive reference. 1567 */ 1568 if (ia->ia6_ndpr == NULL) { 1569 nd6log((LOG_NOTICE, 1570 "in6_unlink_ifa: autoconf'ed address " 1571 "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia)))); 1572 } else { 1573 ia->ia6_ndpr->ndpr_refcnt--; 1574 ia->ia6_ndpr = NULL; 1575 } 1576 1577 /* 1578 * Also, if the address being removed is autoconf'ed, call 1579 * pfxlist_onlink_check() since the release might affect the status of 1580 * other (detached) addresses. 1581 */ 1582 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1583 pfxlist_onlink_check(); 1584 } 1585 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1586} 1587 1588void 1589in6_purgeif(struct ifnet *ifp) 1590{ 1591 struct ifaddr *ifa, *nifa; 1592 1593 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) { 1594 if (ifa->ifa_addr->sa_family != AF_INET6) 1595 continue; 1596 in6_purgeaddr(ifa); 1597 } 1598 1599 in6_ifdetach(ifp); 1600} 1601 1602/* 1603 * SIOC[GAD]LIFADDR. 1604 * SIOCGLIFADDR: get first address. (?) 1605 * SIOCGLIFADDR with IFLR_PREFIX: 1606 * get first address that matches the specified prefix. 1607 * SIOCALIFADDR: add the specified address. 1608 * SIOCALIFADDR with IFLR_PREFIX: 1609 * add the specified prefix, filling hostid part from 1610 * the first link-local address. prefixlen must be <= 64. 1611 * SIOCDLIFADDR: delete the specified address. 1612 * SIOCDLIFADDR with IFLR_PREFIX: 1613 * delete the first address that matches the specified prefix. 1614 * return values: 1615 * EINVAL on invalid parameters 1616 * EADDRNOTAVAIL on prefix match failed/specified address not found 1617 * other values may be returned from in6_ioctl() 1618 * 1619 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1620 * this is to accomodate address naming scheme other than RFC2374, 1621 * in the future. 1622 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1623 * address encoding scheme. (see figure on page 8) 1624 */ 1625static int 1626in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 1627 struct ifnet *ifp, struct thread *td) 1628{ 1629 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1630 struct ifaddr *ifa; 1631 struct sockaddr *sa; 1632 1633 /* sanity checks */ 1634 if (!data || !ifp) { 1635 panic("invalid argument to in6_lifaddr_ioctl"); 1636 /* NOTREACHED */ 1637 } 1638 1639 switch (cmd) { 1640 case SIOCGLIFADDR: 1641 /* address must be specified on GET with IFLR_PREFIX */ 1642 if ((iflr->flags & IFLR_PREFIX) == 0) 1643 break; 1644 /* FALLTHROUGH */ 1645 case SIOCALIFADDR: 1646 case SIOCDLIFADDR: 1647 /* address must be specified on ADD and DELETE */ 1648 sa = (struct sockaddr *)&iflr->addr; 1649 if (sa->sa_family != AF_INET6) 1650 return EINVAL; 1651 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1652 return EINVAL; 1653 /* XXX need improvement */ 1654 sa = (struct sockaddr *)&iflr->dstaddr; 1655 if (sa->sa_family && sa->sa_family != AF_INET6) 1656 return EINVAL; 1657 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1658 return EINVAL; 1659 break; 1660 default: /* shouldn't happen */ 1661#if 0 1662 panic("invalid cmd to in6_lifaddr_ioctl"); 1663 /* NOTREACHED */ 1664#else 1665 return EOPNOTSUPP; 1666#endif 1667 } 1668 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) 1669 return EINVAL; 1670 1671 switch (cmd) { 1672 case SIOCALIFADDR: 1673 { 1674 struct in6_aliasreq ifra; 1675 struct in6_addr *hostid = NULL; 1676 int prefixlen; 1677 1678 ifa = NULL; 1679 if ((iflr->flags & IFLR_PREFIX) != 0) { 1680 struct sockaddr_in6 *sin6; 1681 1682 /* 1683 * hostid is to fill in the hostid part of the 1684 * address. hostid points to the first link-local 1685 * address attached to the interface. 1686 */ 1687 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1688 if (!ifa) 1689 return EADDRNOTAVAIL; 1690 hostid = IFA_IN6(ifa); 1691 1692 /* prefixlen must be <= 64. */ 1693 if (64 < iflr->prefixlen) { 1694 if (ifa != NULL) 1695 ifa_free(ifa); 1696 return EINVAL; 1697 } 1698 prefixlen = iflr->prefixlen; 1699 1700 /* hostid part must be zero. */ 1701 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1702 if (sin6->sin6_addr.s6_addr32[2] != 0 || 1703 sin6->sin6_addr.s6_addr32[3] != 0) { 1704 if (ifa != NULL) 1705 ifa_free(ifa); 1706 return EINVAL; 1707 } 1708 } else 1709 prefixlen = iflr->prefixlen; 1710 1711 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1712 bzero(&ifra, sizeof(ifra)); 1713 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name)); 1714 1715 bcopy(&iflr->addr, &ifra.ifra_addr, 1716 ((struct sockaddr *)&iflr->addr)->sa_len); 1717 if (hostid) { 1718 /* fill in hostid part */ 1719 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1720 hostid->s6_addr32[2]; 1721 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1722 hostid->s6_addr32[3]; 1723 } 1724 1725 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1726 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1727 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1728 if (hostid) { 1729 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1730 hostid->s6_addr32[2]; 1731 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1732 hostid->s6_addr32[3]; 1733 } 1734 } 1735 if (ifa != NULL) 1736 ifa_free(ifa); 1737 1738 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1739 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1740 1741 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1742 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td); 1743 } 1744 case SIOCGLIFADDR: 1745 case SIOCDLIFADDR: 1746 { 1747 struct in6_ifaddr *ia; 1748 struct in6_addr mask, candidate, match; 1749 struct sockaddr_in6 *sin6; 1750 int cmp; 1751 1752 bzero(&mask, sizeof(mask)); 1753 if (iflr->flags & IFLR_PREFIX) { 1754 /* lookup a prefix rather than address. */ 1755 in6_prefixlen2mask(&mask, iflr->prefixlen); 1756 1757 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1758 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1759 match.s6_addr32[0] &= mask.s6_addr32[0]; 1760 match.s6_addr32[1] &= mask.s6_addr32[1]; 1761 match.s6_addr32[2] &= mask.s6_addr32[2]; 1762 match.s6_addr32[3] &= mask.s6_addr32[3]; 1763 1764 /* if you set extra bits, that's wrong */ 1765 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1766 return EINVAL; 1767 1768 cmp = 1; 1769 } else { 1770 if (cmd == SIOCGLIFADDR) { 1771 /* on getting an address, take the 1st match */ 1772 cmp = 0; /* XXX */ 1773 } else { 1774 /* on deleting an address, do exact match */ 1775 in6_prefixlen2mask(&mask, 128); 1776 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1777 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1778 1779 cmp = 1; 1780 } 1781 } 1782 1783 IF_ADDR_RLOCK(ifp); 1784 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1785 if (ifa->ifa_addr->sa_family != AF_INET6) 1786 continue; 1787 if (!cmp) 1788 break; 1789 1790 /* 1791 * XXX: this is adhoc, but is necessary to allow 1792 * a user to specify fe80::/64 (not /10) for a 1793 * link-local address. 1794 */ 1795 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1796 in6_clearscope(&candidate); 1797 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1798 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1799 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1800 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1801 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1802 break; 1803 } 1804 if (ifa != NULL) 1805 ifa_ref(ifa); 1806 IF_ADDR_RUNLOCK(ifp); 1807 if (!ifa) 1808 return EADDRNOTAVAIL; 1809 ia = ifa2ia6(ifa); 1810 1811 if (cmd == SIOCGLIFADDR) { 1812 int error; 1813 1814 /* fill in the if_laddrreq structure */ 1815 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1816 error = sa6_recoverscope( 1817 (struct sockaddr_in6 *)&iflr->addr); 1818 if (error != 0) { 1819 ifa_free(ifa); 1820 return (error); 1821 } 1822 1823 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1824 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1825 ia->ia_dstaddr.sin6_len); 1826 error = sa6_recoverscope( 1827 (struct sockaddr_in6 *)&iflr->dstaddr); 1828 if (error != 0) { 1829 ifa_free(ifa); 1830 return (error); 1831 } 1832 } else 1833 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1834 1835 iflr->prefixlen = 1836 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1837 1838 iflr->flags = ia->ia6_flags; /* XXX */ 1839 ifa_free(ifa); 1840 1841 return 0; 1842 } else { 1843 struct in6_aliasreq ifra; 1844 1845 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1846 bzero(&ifra, sizeof(ifra)); 1847 bcopy(iflr->iflr_name, ifra.ifra_name, 1848 sizeof(ifra.ifra_name)); 1849 1850 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1851 ia->ia_addr.sin6_len); 1852 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1853 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1854 ia->ia_dstaddr.sin6_len); 1855 } else { 1856 bzero(&ifra.ifra_dstaddr, 1857 sizeof(ifra.ifra_dstaddr)); 1858 } 1859 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1860 ia->ia_prefixmask.sin6_len); 1861 1862 ifra.ifra_flags = ia->ia6_flags; 1863 ifa_free(ifa); 1864 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, 1865 ifp, td); 1866 } 1867 } 1868 } 1869 1870 return EOPNOTSUPP; /* just for safety */ 1871} 1872 1873/* 1874 * Initialize an interface's IPv6 address and routing table entry. 1875 */ 1876static int 1877in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1878 struct sockaddr_in6 *sin6, int newhost) 1879{ 1880 int error = 0, plen, ifacount = 0; 1881 struct ifaddr *ifa; 1882 1883 /* 1884 * Give the interface a chance to initialize 1885 * if this is its first address, 1886 * and to validate the address if necessary. 1887 */ 1888 IF_ADDR_RLOCK(ifp); 1889 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1890 if (ifa->ifa_addr->sa_family != AF_INET6) 1891 continue; 1892 ifacount++; 1893 } 1894 IF_ADDR_RUNLOCK(ifp); 1895 1896 ia->ia_addr = *sin6; 1897 1898 if (ifacount <= 1 && ifp->if_ioctl) { 1899 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1900 if (error) 1901 return (error); 1902 } 1903 1904 ia->ia_ifa.ifa_metric = ifp->if_metric; 1905 1906 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1907 1908 /* 1909 * Special case: 1910 * If a new destination address is specified for a point-to-point 1911 * interface, install a route to the destination as an interface 1912 * direct route. 1913 * XXX: the logic below rejects assigning multiple addresses on a p2p 1914 * interface that share the same destination. 1915 */ 1916 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1917 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 && 1918 ia->ia_dstaddr.sin6_family == AF_INET6) { 1919 int rtflags = RTF_UP | RTF_HOST; 1920 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags); 1921 if (error) 1922 return (error); 1923 ia->ia_flags |= IFA_ROUTE; 1924 /* 1925 * Handle the case for ::1 . 1926 */ 1927 if (ifp->if_flags & IFF_LOOPBACK) 1928 ia->ia_flags |= IFA_RTSELF; 1929 } 1930 1931 /* 1932 * add a loopback route to self 1933 */ 1934 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) { 1935 error = ifa_add_loopback_route((struct ifaddr *)ia, 1936 (struct sockaddr *)&ia->ia_addr); 1937 if (error == 0) 1938 ia->ia_flags |= IFA_RTSELF; 1939 } 1940 1941 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1942 if (newhost) 1943 in6_ifaddloop(&(ia->ia_ifa)); 1944 1945 return (error); 1946} 1947 1948/* 1949 * Find an IPv6 interface link-local address specific to an interface. 1950 * ifaddr is returned referenced. 1951 */ 1952struct in6_ifaddr * 1953in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1954{ 1955 struct ifaddr *ifa; 1956 1957 IF_ADDR_RLOCK(ifp); 1958 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1959 if (ifa->ifa_addr->sa_family != AF_INET6) 1960 continue; 1961 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1962 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1963 ignoreflags) != 0) 1964 continue; 1965 ifa_ref(ifa); 1966 break; 1967 } 1968 } 1969 IF_ADDR_RUNLOCK(ifp); 1970 1971 return ((struct in6_ifaddr *)ifa); 1972} 1973 1974 1975/* 1976 * find the internet address corresponding to a given interface and address. 1977 * ifaddr is returned referenced. 1978 */ 1979struct in6_ifaddr * 1980in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr) 1981{ 1982 struct ifaddr *ifa; 1983 1984 IF_ADDR_RLOCK(ifp); 1985 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1986 if (ifa->ifa_addr->sa_family != AF_INET6) 1987 continue; 1988 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1989 ifa_ref(ifa); 1990 break; 1991 } 1992 } 1993 IF_ADDR_RUNLOCK(ifp); 1994 1995 return ((struct in6_ifaddr *)ifa); 1996} 1997 1998/* 1999 * Find a link-local scoped address on ifp and return it if any. 2000 */ 2001struct in6_ifaddr * 2002in6ifa_llaonifp(struct ifnet *ifp) 2003{ 2004 struct sockaddr_in6 *sin6; 2005 struct ifaddr *ifa; 2006 2007 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 2008 return (NULL); 2009 if_addr_rlock(ifp); 2010 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2011 if (ifa->ifa_addr->sa_family != AF_INET6) 2012 continue; 2013 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 2014 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 2015 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) || 2016 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr)) 2017 break; 2018 } 2019 if_addr_runlock(ifp); 2020 2021 return ((struct in6_ifaddr *)ifa); 2022} 2023 2024/* 2025 * Convert IP6 address to printable (loggable) representation. Caller 2026 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 2027 */ 2028static char digits[] = "0123456789abcdef"; 2029char * 2030ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 2031{ 2032 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0; 2033 char *cp; 2034 const u_int16_t *a = (const u_int16_t *)addr; 2035 const u_int8_t *d; 2036 int dcolon = 0, zero = 0; 2037 2038 cp = ip6buf; 2039 2040 for (i = 0; i < 8; i++) { 2041 if (*(a + i) == 0) { 2042 cnt++; 2043 if (cnt == 1) 2044 idx = i; 2045 } 2046 else if (maxcnt < cnt) { 2047 maxcnt = cnt; 2048 index = idx; 2049 cnt = 0; 2050 } 2051 } 2052 if (maxcnt < cnt) { 2053 maxcnt = cnt; 2054 index = idx; 2055 } 2056 2057 for (i = 0; i < 8; i++) { 2058 if (dcolon == 1) { 2059 if (*a == 0) { 2060 if (i == 7) 2061 *cp++ = ':'; 2062 a++; 2063 continue; 2064 } else 2065 dcolon = 2; 2066 } 2067 if (*a == 0) { 2068 if (dcolon == 0 && *(a + 1) == 0 && i == index) { 2069 if (i == 0) 2070 *cp++ = ':'; 2071 *cp++ = ':'; 2072 dcolon = 1; 2073 } else { 2074 *cp++ = '0'; 2075 *cp++ = ':'; 2076 } 2077 a++; 2078 continue; 2079 } 2080 d = (const u_char *)a; 2081 /* Try to eliminate leading zeros in printout like in :0001. */ 2082 zero = 1; 2083 *cp = digits[*d >> 4]; 2084 if (*cp != '0') { 2085 zero = 0; 2086 cp++; 2087 } 2088 *cp = digits[*d++ & 0xf]; 2089 if (zero == 0 || (*cp != '0')) { 2090 zero = 0; 2091 cp++; 2092 } 2093 *cp = digits[*d >> 4]; 2094 if (zero == 0 || (*cp != '0')) { 2095 zero = 0; 2096 cp++; 2097 } 2098 *cp++ = digits[*d & 0xf]; 2099 *cp++ = ':'; 2100 a++; 2101 } 2102 *--cp = '\0'; 2103 return (ip6buf); 2104} 2105 2106int 2107in6_localaddr(struct in6_addr *in6) 2108{ 2109 struct in6_ifaddr *ia; 2110 2111 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 2112 return 1; 2113 2114 IN6_IFADDR_RLOCK(); 2115 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 2116 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 2117 &ia->ia_prefixmask.sin6_addr)) { 2118 IN6_IFADDR_RUNLOCK(); 2119 return 1; 2120 } 2121 } 2122 IN6_IFADDR_RUNLOCK(); 2123 2124 return (0); 2125} 2126 2127/* 2128 * Return 1 if an internet address is for the local host and configured 2129 * on one of its interfaces. 2130 */ 2131int 2132in6_localip(struct in6_addr *in6) 2133{ 2134 struct in6_ifaddr *ia; 2135 2136 IN6_IFADDR_RLOCK(); 2137 LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 2138 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) { 2139 IN6_IFADDR_RUNLOCK(); 2140 return (1); 2141 } 2142 } 2143 IN6_IFADDR_RUNLOCK(); 2144 return (0); 2145} 2146 2147int 2148in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 2149{ 2150 struct in6_ifaddr *ia; 2151 2152 IN6_IFADDR_RLOCK(); 2153 LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) { 2154 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) { 2155 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2156 IN6_IFADDR_RUNLOCK(); 2157 return (1); /* true */ 2158 } 2159 break; 2160 } 2161 } 2162 IN6_IFADDR_RUNLOCK(); 2163 2164 return (0); /* false */ 2165} 2166 2167/* 2168 * return length of part which dst and src are equal 2169 * hard coding... 2170 */ 2171int 2172in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 2173{ 2174 int match = 0; 2175 u_char *s = (u_char *)src, *d = (u_char *)dst; 2176 u_char *lim = s + 16, r; 2177 2178 while (s < lim) 2179 if ((r = (*d++ ^ *s++)) != 0) { 2180 while (r < 128) { 2181 match++; 2182 r <<= 1; 2183 } 2184 break; 2185 } else 2186 match += 8; 2187 return match; 2188} 2189 2190/* XXX: to be scope conscious */ 2191int 2192in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 2193{ 2194 int bytelen, bitlen; 2195 2196 /* sanity check */ 2197 if (0 > len || len > 128) { 2198 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 2199 len); 2200 return (0); 2201 } 2202 2203 bytelen = len / 8; 2204 bitlen = len % 8; 2205 2206 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 2207 return (0); 2208 if (bitlen != 0 && 2209 p1->s6_addr[bytelen] >> (8 - bitlen) != 2210 p2->s6_addr[bytelen] >> (8 - bitlen)) 2211 return (0); 2212 2213 return (1); 2214} 2215 2216void 2217in6_prefixlen2mask(struct in6_addr *maskp, int len) 2218{ 2219 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 2220 int bytelen, bitlen, i; 2221 2222 /* sanity check */ 2223 if (0 > len || len > 128) { 2224 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 2225 len); 2226 return; 2227 } 2228 2229 bzero(maskp, sizeof(*maskp)); 2230 bytelen = len / 8; 2231 bitlen = len % 8; 2232 for (i = 0; i < bytelen; i++) 2233 maskp->s6_addr[i] = 0xff; 2234 if (bitlen) 2235 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 2236} 2237 2238/* 2239 * return the best address out of the same scope. if no address was 2240 * found, return the first valid address from designated IF. 2241 */ 2242struct in6_ifaddr * 2243in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2244{ 2245 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2246 struct ifaddr *ifa; 2247 struct in6_ifaddr *besta = 0; 2248 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2249 2250 dep[0] = dep[1] = NULL; 2251 2252 /* 2253 * We first look for addresses in the same scope. 2254 * If there is one, return it. 2255 * If two or more, return one which matches the dst longest. 2256 * If none, return one of global addresses assigned other ifs. 2257 */ 2258 IF_ADDR_RLOCK(ifp); 2259 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2260 if (ifa->ifa_addr->sa_family != AF_INET6) 2261 continue; 2262 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2263 continue; /* XXX: is there any case to allow anycast? */ 2264 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2265 continue; /* don't use this interface */ 2266 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2267 continue; 2268 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2269 if (V_ip6_use_deprecated) 2270 dep[0] = (struct in6_ifaddr *)ifa; 2271 continue; 2272 } 2273 2274 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2275 /* 2276 * call in6_matchlen() as few as possible 2277 */ 2278 if (besta) { 2279 if (blen == -1) 2280 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2281 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2282 if (tlen > blen) { 2283 blen = tlen; 2284 besta = (struct in6_ifaddr *)ifa; 2285 } 2286 } else 2287 besta = (struct in6_ifaddr *)ifa; 2288 } 2289 } 2290 if (besta) { 2291 ifa_ref(&besta->ia_ifa); 2292 IF_ADDR_RUNLOCK(ifp); 2293 return (besta); 2294 } 2295 2296 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2297 if (ifa->ifa_addr->sa_family != AF_INET6) 2298 continue; 2299 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2300 continue; /* XXX: is there any case to allow anycast? */ 2301 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2302 continue; /* don't use this interface */ 2303 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2304 continue; 2305 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2306 if (V_ip6_use_deprecated) 2307 dep[1] = (struct in6_ifaddr *)ifa; 2308 continue; 2309 } 2310 2311 if (ifa != NULL) 2312 ifa_ref(ifa); 2313 IF_ADDR_RUNLOCK(ifp); 2314 return (struct in6_ifaddr *)ifa; 2315 } 2316 2317 /* use the last-resort values, that are, deprecated addresses */ 2318 if (dep[0]) { 2319 ifa_ref((struct ifaddr *)dep[0]); 2320 IF_ADDR_RUNLOCK(ifp); 2321 return dep[0]; 2322 } 2323 if (dep[1]) { 2324 ifa_ref((struct ifaddr *)dep[1]); 2325 IF_ADDR_RUNLOCK(ifp); 2326 return dep[1]; 2327 } 2328 2329 IF_ADDR_RUNLOCK(ifp); 2330 return NULL; 2331} 2332 2333/* 2334 * perform DAD when interface becomes IFF_UP. 2335 */ 2336void 2337in6_if_up(struct ifnet *ifp) 2338{ 2339 struct ifaddr *ifa; 2340 struct in6_ifaddr *ia; 2341 2342 IF_ADDR_RLOCK(ifp); 2343 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2344 if (ifa->ifa_addr->sa_family != AF_INET6) 2345 continue; 2346 ia = (struct in6_ifaddr *)ifa; 2347 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2348 /* 2349 * The TENTATIVE flag was likely set by hand 2350 * beforehand, implicitly indicating the need for DAD. 2351 * We may be able to skip the random delay in this 2352 * case, but we impose delays just in case. 2353 */ 2354 nd6_dad_start(ifa, 2355 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 2356 } 2357 } 2358 IF_ADDR_RUNLOCK(ifp); 2359 2360 /* 2361 * special cases, like 6to4, are handled in in6_ifattach 2362 */ 2363 in6_ifattach(ifp, NULL); 2364} 2365 2366int 2367in6if_do_dad(struct ifnet *ifp) 2368{ 2369 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 2370 return (0); 2371 2372 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) || 2373 (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD)) 2374 return (0); 2375 2376 switch (ifp->if_type) { 2377#ifdef IFT_DUMMY 2378 case IFT_DUMMY: 2379#endif 2380 case IFT_FAITH: 2381 /* 2382 * These interfaces do not have the IFF_LOOPBACK flag, 2383 * but loop packets back. We do not have to do DAD on such 2384 * interfaces. We should even omit it, because loop-backed 2385 * NS would confuse the DAD procedure. 2386 */ 2387 return (0); 2388 default: 2389 /* 2390 * Our DAD routine requires the interface up and running. 2391 * However, some interfaces can be up before the RUNNING 2392 * status. Additionaly, users may try to assign addresses 2393 * before the interface becomes up (or running). 2394 * We simply skip DAD in such a case as a work around. 2395 * XXX: we should rather mark "tentative" on such addresses, 2396 * and do DAD after the interface becomes ready. 2397 */ 2398 if (!((ifp->if_flags & IFF_UP) && 2399 (ifp->if_drv_flags & IFF_DRV_RUNNING))) 2400 return (0); 2401 2402 return (1); 2403 } 2404} 2405 2406/* 2407 * Calculate max IPv6 MTU through all the interfaces and store it 2408 * to in6_maxmtu. 2409 */ 2410void 2411in6_setmaxmtu(void) 2412{ 2413 unsigned long maxmtu = 0; 2414 struct ifnet *ifp; 2415 2416 IFNET_RLOCK_NOSLEEP(); 2417 TAILQ_FOREACH(ifp, &V_ifnet, if_list) { 2418 /* this function can be called during ifnet initialization */ 2419 if (!ifp->if_afdata[AF_INET6]) 2420 continue; 2421 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2422 IN6_LINKMTU(ifp) > maxmtu) 2423 maxmtu = IN6_LINKMTU(ifp); 2424 } 2425 IFNET_RUNLOCK_NOSLEEP(); 2426 if (maxmtu) /* update only when maxmtu is positive */ 2427 V_in6_maxmtu = maxmtu; 2428} 2429 2430/* 2431 * Provide the length of interface identifiers to be used for the link attached 2432 * to the given interface. The length should be defined in "IPv6 over 2433 * xxx-link" document. Note that address architecture might also define 2434 * the length for a particular set of address prefixes, regardless of the 2435 * link type. As clarified in rfc2462bis, those two definitions should be 2436 * consistent, and those really are as of August 2004. 2437 */ 2438int 2439in6_if2idlen(struct ifnet *ifp) 2440{ 2441 switch (ifp->if_type) { 2442 case IFT_ETHER: /* RFC2464 */ 2443#ifdef IFT_PROPVIRTUAL 2444 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2445#endif 2446#ifdef IFT_L2VLAN 2447 case IFT_L2VLAN: /* ditto */ 2448#endif 2449#ifdef IFT_IEEE80211 2450 case IFT_IEEE80211: /* ditto */ 2451#endif 2452#ifdef IFT_MIP 2453 case IFT_MIP: /* ditto */ 2454#endif 2455 case IFT_INFINIBAND: 2456 return (64); 2457 case IFT_FDDI: /* RFC2467 */ 2458 return (64); 2459 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 2460 return (64); 2461 case IFT_PPP: /* RFC2472 */ 2462 return (64); 2463 case IFT_ARCNET: /* RFC2497 */ 2464 return (64); 2465 case IFT_FRELAY: /* RFC2590 */ 2466 return (64); 2467 case IFT_IEEE1394: /* RFC3146 */ 2468 return (64); 2469 case IFT_GIF: 2470 return (64); /* draft-ietf-v6ops-mech-v2-07 */ 2471 case IFT_LOOP: 2472 return (64); /* XXX: is this really correct? */ 2473 default: 2474 /* 2475 * Unknown link type: 2476 * It might be controversial to use the today's common constant 2477 * of 64 for these cases unconditionally. For full compliance, 2478 * we should return an error in this case. On the other hand, 2479 * if we simply miss the standard for the link type or a new 2480 * standard is defined for a new link type, the IFID length 2481 * is very likely to be the common constant. As a compromise, 2482 * we always use the constant, but make an explicit notice 2483 * indicating the "unknown" case. 2484 */ 2485 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2486 return (64); 2487 } 2488} 2489 2490#include <sys/sysctl.h> 2491 2492struct in6_llentry { 2493 struct llentry base; 2494 struct sockaddr_in6 l3_addr6; 2495}; 2496 2497/* 2498 * Deletes an address from the address table. 2499 * This function is called by the timer functions 2500 * such as arptimer() and nd6_llinfo_timer(), and 2501 * the caller does the locking. 2502 */ 2503static void 2504in6_lltable_free(struct lltable *llt, struct llentry *lle) 2505{ 2506 LLE_WUNLOCK(lle); 2507 LLE_LOCK_DESTROY(lle); 2508 free(lle, M_LLTABLE); 2509} 2510 2511static struct llentry * 2512in6_lltable_new(const struct sockaddr *l3addr, u_int flags) 2513{ 2514 struct in6_llentry *lle; 2515 2516 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 2517 if (lle == NULL) /* NB: caller generates msg */ 2518 return NULL; 2519 2520 lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr; 2521 lle->base.lle_refcnt = 1; 2522 lle->base.lle_free = in6_lltable_free; 2523 LLE_LOCK_INIT(&lle->base); 2524 callout_init(&lle->base.ln_timer_ch, 1); 2525 2526 return (&lle->base); 2527} 2528 2529static void 2530in6_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix, 2531 const struct sockaddr *mask, u_int flags) 2532{ 2533 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix; 2534 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask; 2535 struct llentry *lle, *next; 2536 int i; 2537 2538 /* 2539 * (flags & LLE_STATIC) means deleting all entries 2540 * including static ND6 entries. 2541 */ 2542 IF_AFDATA_WLOCK(llt->llt_ifp); 2543 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 2544 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 2545 if (IN6_ARE_MASKED_ADDR_EQUAL( 2546 &satosin6(L3_ADDR(lle))->sin6_addr, 2547 &pfx->sin6_addr, &msk->sin6_addr) && 2548 ((flags & LLE_STATIC) || 2549 !(lle->la_flags & LLE_STATIC))) { 2550 LLE_WLOCK(lle); 2551 if (callout_stop(&lle->la_timer)) 2552 LLE_REMREF(lle); 2553 llentry_free(lle); 2554 } 2555 } 2556 } 2557 IF_AFDATA_WUNLOCK(llt->llt_ifp); 2558} 2559 2560static int 2561in6_lltable_rtcheck(struct ifnet *ifp, 2562 u_int flags, 2563 const struct sockaddr *l3addr) 2564{ 2565 struct rtentry *rt; 2566 char ip6buf[INET6_ADDRSTRLEN]; 2567 2568 KASSERT(l3addr->sa_family == AF_INET6, 2569 ("sin_family %d", l3addr->sa_family)); 2570 2571 /* Our local addresses are always only installed on the default FIB. */ 2572 /* XXX rtalloc1 should take a const param */ 2573 rt = in6_rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0, 2574 RT_DEFAULT_FIB); 2575 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 2576 struct ifaddr *ifa; 2577 /* 2578 * Create an ND6 cache for an IPv6 neighbor 2579 * that is not covered by our own prefix. 2580 */ 2581 /* XXX ifaof_ifpforaddr should take a const param */ 2582 ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp); 2583 if (ifa != NULL) { 2584 ifa_free(ifa); 2585 if (rt != NULL) 2586 RTFREE_LOCKED(rt); 2587 return 0; 2588 } 2589 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2590 ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr)); 2591 if (rt != NULL) 2592 RTFREE_LOCKED(rt); 2593 return EINVAL; 2594 } 2595 RTFREE_LOCKED(rt); 2596 return 0; 2597} 2598 2599static struct llentry * 2600in6_lltable_lookup(struct lltable *llt, u_int flags, 2601 const struct sockaddr *l3addr) 2602{ 2603 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2604 struct ifnet *ifp = llt->llt_ifp; 2605 struct llentry *lle; 2606 struct llentries *lleh; 2607 u_int hashkey; 2608 2609 IF_AFDATA_LOCK_ASSERT(ifp); 2610 KASSERT(l3addr->sa_family == AF_INET6, 2611 ("sin_family %d", l3addr->sa_family)); 2612 2613 hashkey = sin6->sin6_addr.s6_addr32[3]; 2614 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 2615 LIST_FOREACH(lle, lleh, lle_next) { 2616 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle); 2617 if (lle->la_flags & LLE_DELETED) 2618 continue; 2619 if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr, 2620 sizeof(struct in6_addr)) == 0) 2621 break; 2622 } 2623 2624 if (lle == NULL) { 2625 if (!(flags & LLE_CREATE)) 2626 return (NULL); 2627 IF_AFDATA_WLOCK_ASSERT(ifp); 2628 /* 2629 * A route that covers the given address must have 2630 * been installed 1st because we are doing a resolution, 2631 * verify this. 2632 */ 2633 if (!(flags & LLE_IFADDR) && 2634 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2635 return NULL; 2636 2637 lle = in6_lltable_new(l3addr, flags); 2638 if (lle == NULL) { 2639 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2640 return NULL; 2641 } 2642 lle->la_flags = flags & ~LLE_CREATE; 2643 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 2644 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 2645 lle->la_flags |= (LLE_VALID | LLE_STATIC); 2646 } 2647 2648 lle->lle_tbl = llt; 2649 lle->lle_head = lleh; 2650 lle->la_flags |= LLE_LINKED; 2651 LIST_INSERT_HEAD(lleh, lle, lle_next); 2652 } else if (flags & LLE_DELETE) { 2653 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 2654 LLE_WLOCK(lle); 2655 lle->la_flags |= LLE_DELETED; 2656 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 2657#ifdef DIAGNOSTIC 2658 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2659#endif 2660 if ((lle->la_flags & 2661 (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC) 2662 llentry_free(lle); 2663 else 2664 LLE_WUNLOCK(lle); 2665 } 2666 lle = (void *)-1; 2667 } 2668 if (LLE_IS_VALID(lle)) { 2669 if (flags & LLE_EXCLUSIVE) 2670 LLE_WLOCK(lle); 2671 else 2672 LLE_RLOCK(lle); 2673 } 2674 return (lle); 2675} 2676 2677static int 2678in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 2679{ 2680 struct ifnet *ifp = llt->llt_ifp; 2681 struct llentry *lle; 2682 /* XXX stack use */ 2683 struct { 2684 struct rt_msghdr rtm; 2685 struct sockaddr_in6 sin6; 2686 /* 2687 * ndp.c assumes that sdl is word aligned 2688 */ 2689#ifdef __LP64__ 2690 uint32_t pad; 2691#endif 2692 struct sockaddr_dl sdl; 2693 } ndpc; 2694 int i, error; 2695 2696 if (ifp->if_flags & IFF_LOOPBACK) 2697 return 0; 2698 2699 LLTABLE_LOCK_ASSERT(); 2700 2701 error = 0; 2702 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 2703 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 2704 struct sockaddr_dl *sdl; 2705 2706 /* skip deleted or invalid entries */ 2707 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID) 2708 continue; 2709 /* Skip if jailed and not a valid IP of the prison. */ 2710 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 2711 continue; 2712 /* 2713 * produce a msg made of: 2714 * struct rt_msghdr; 2715 * struct sockaddr_in6 (IPv6) 2716 * struct sockaddr_dl; 2717 */ 2718 bzero(&ndpc, sizeof(ndpc)); 2719 ndpc.rtm.rtm_msglen = sizeof(ndpc); 2720 ndpc.rtm.rtm_version = RTM_VERSION; 2721 ndpc.rtm.rtm_type = RTM_GET; 2722 ndpc.rtm.rtm_flags = RTF_UP; 2723 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 2724 ndpc.sin6.sin6_family = AF_INET6; 2725 ndpc.sin6.sin6_len = sizeof(ndpc.sin6); 2726 bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle)); 2727 if (V_deembed_scopeid) 2728 sa6_recoverscope(&ndpc.sin6); 2729 2730 /* publish */ 2731 if (lle->la_flags & LLE_PUB) 2732 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE; 2733 2734 sdl = &ndpc.sdl; 2735 sdl->sdl_family = AF_LINK; 2736 sdl->sdl_len = sizeof(*sdl); 2737 sdl->sdl_alen = ifp->if_addrlen; 2738 sdl->sdl_index = ifp->if_index; 2739 sdl->sdl_type = ifp->if_type; 2740 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 2741 ndpc.rtm.rtm_rmx.rmx_expire = 2742 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 2743 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 2744 if (lle->la_flags & LLE_STATIC) 2745 ndpc.rtm.rtm_flags |= RTF_STATIC; 2746 ndpc.rtm.rtm_index = ifp->if_index; 2747 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc)); 2748 if (error) 2749 break; 2750 } 2751 } 2752 return error; 2753} 2754 2755void * 2756in6_domifattach(struct ifnet *ifp) 2757{ 2758 struct in6_ifextra *ext; 2759 2760 /* There are not IPv6-capable interfaces. */ 2761 switch (ifp->if_type) { 2762 case IFT_PFLOG: 2763 case IFT_PFSYNC: 2764 case IFT_USB: 2765 return (NULL); 2766 } 2767 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2768 bzero(ext, sizeof(*ext)); 2769 2770 ext->in6_ifstat = malloc(sizeof(counter_u64_t) * 2771 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK); 2772 COUNTER_ARRAY_ALLOC(ext->in6_ifstat, 2773 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK); 2774 2775 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) * 2776 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR, 2777 M_WAITOK); 2778 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat, 2779 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK); 2780 2781 ext->nd_ifinfo = nd6_ifattach(ifp); 2782 ext->scope6_id = scope6_ifattach(ifp); 2783 ext->lltable = lltable_init(ifp, AF_INET6); 2784 if (ext->lltable != NULL) { 2785 ext->lltable->llt_prefix_free = in6_lltable_prefix_free; 2786 ext->lltable->llt_lookup = in6_lltable_lookup; 2787 ext->lltable->llt_dump = in6_lltable_dump; 2788 } 2789 2790 ext->mld_ifinfo = mld_domifattach(ifp); 2791 2792 return ext; 2793} 2794 2795void 2796in6_domifdetach(struct ifnet *ifp, void *aux) 2797{ 2798 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2799 2800 mld_domifdetach(ifp); 2801 scope6_ifdetach(ext->scope6_id); 2802 nd6_ifdetach(ext->nd_ifinfo); 2803 lltable_free(ext->lltable); 2804 COUNTER_ARRAY_FREE(ext->in6_ifstat, 2805 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 2806 free(ext->in6_ifstat, M_IFADDR); 2807 COUNTER_ARRAY_FREE(ext->icmp6_ifstat, 2808 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 2809 free(ext->icmp6_ifstat, M_IFADDR); 2810 free(ext, M_IFADDR); 2811} 2812 2813/* 2814 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2815 * v4 mapped addr or v4 compat addr 2816 */ 2817void 2818in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2819{ 2820 2821 bzero(sin, sizeof(*sin)); 2822 sin->sin_len = sizeof(struct sockaddr_in); 2823 sin->sin_family = AF_INET; 2824 sin->sin_port = sin6->sin6_port; 2825 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2826} 2827 2828/* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2829void 2830in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2831{ 2832 bzero(sin6, sizeof(*sin6)); 2833 sin6->sin6_len = sizeof(struct sockaddr_in6); 2834 sin6->sin6_family = AF_INET6; 2835 sin6->sin6_port = sin->sin_port; 2836 sin6->sin6_addr.s6_addr32[0] = 0; 2837 sin6->sin6_addr.s6_addr32[1] = 0; 2838 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2839 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2840} 2841 2842/* Convert sockaddr_in6 into sockaddr_in. */ 2843void 2844in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2845{ 2846 struct sockaddr_in *sin_p; 2847 struct sockaddr_in6 sin6; 2848 2849 /* 2850 * Save original sockaddr_in6 addr and convert it 2851 * to sockaddr_in. 2852 */ 2853 sin6 = *(struct sockaddr_in6 *)nam; 2854 sin_p = (struct sockaddr_in *)nam; 2855 in6_sin6_2_sin(sin_p, &sin6); 2856} 2857 2858/* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2859void 2860in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2861{ 2862 struct sockaddr_in *sin_p; 2863 struct sockaddr_in6 *sin6_p; 2864 2865 sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK); 2866 sin_p = (struct sockaddr_in *)*nam; 2867 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2868 free(*nam, M_SONAME); 2869 *nam = (struct sockaddr *)sin6_p; 2870} 2871