in6.c revision 303458
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 303458 2016-07-28 20:08:01Z sbruno $"); 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 SIOCGNBRINFO_IN6: 327 case SIOCGDEFIFACE_IN6: 328 return (nd6_ioctl(cmd, data, ifp)); 329 330#ifdef COMPAT_FREEBSD32 331 case SIOCGDEFIFACE32_IN6: 332 { 333 struct in6_ndifreq ndif; 334 struct in6_ndifreq32 *ndif32; 335 336 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif, 337 ifp); 338 if (error) 339 return (error); 340 ndif32 = (struct in6_ndifreq32 *)data; 341 ndif32->ifindex = ndif.ifindex; 342 return (0); 343 } 344#endif 345 } 346 347 switch (cmd) { 348 case SIOCSIFPREFIX_IN6: 349 case SIOCDIFPREFIX_IN6: 350 case SIOCAIFPREFIX_IN6: 351 case SIOCCIFPREFIX_IN6: 352 case SIOCSGIFPREFIX_IN6: 353 case SIOCGIFPREFIX_IN6: 354 log(LOG_NOTICE, 355 "prefix ioctls are now invalidated. " 356 "please use ifconfig.\n"); 357 return (EOPNOTSUPP); 358 } 359 360 switch (cmd) { 361 case SIOCSSCOPE6: 362 if (td != NULL) { 363 error = priv_check(td, PRIV_NETINET_SCOPE6); 364 if (error) 365 return (error); 366 } 367 /* FALLTHROUGH */ 368 case SIOCGSCOPE6: 369 case SIOCGSCOPE6DEF: 370 return (scope6_ioctl(cmd, data, ifp)); 371 } 372 373 switch (cmd) { 374 case SIOCALIFADDR: 375 if (td != NULL) { 376 error = priv_check(td, PRIV_NET_ADDIFADDR); 377 if (error) 378 return (error); 379 } 380 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 381 382 case SIOCDLIFADDR: 383 if (td != NULL) { 384 error = priv_check(td, PRIV_NET_DELIFADDR); 385 if (error) 386 return (error); 387 } 388 /* FALLTHROUGH */ 389 case SIOCGLIFADDR: 390 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 391 } 392 393 /* 394 * Find address for this interface, if it exists. 395 * 396 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 397 * only, and used the first interface address as the target of other 398 * operations (without checking ifra_addr). This was because netinet 399 * code/API assumed at most 1 interface address per interface. 400 * Since IPv6 allows a node to assign multiple addresses 401 * on a single interface, we almost always look and check the 402 * presence of ifra_addr, and reject invalid ones here. 403 * It also decreases duplicated code among SIOC*_IN6 operations. 404 */ 405 switch (cmd) { 406 case SIOCAIFADDR_IN6: 407 case SIOCSIFPHYADDR_IN6: 408 sa6 = &ifra->ifra_addr; 409 break; 410 case SIOCSIFADDR_IN6: 411 case SIOCGIFADDR_IN6: 412 case SIOCSIFDSTADDR_IN6: 413 case SIOCSIFNETMASK_IN6: 414 case SIOCGIFDSTADDR_IN6: 415 case SIOCGIFNETMASK_IN6: 416 case SIOCDIFADDR_IN6: 417 case SIOCGIFPSRCADDR_IN6: 418 case SIOCGIFPDSTADDR_IN6: 419 case SIOCGIFAFLAG_IN6: 420 case SIOCSNDFLUSH_IN6: 421 case SIOCSPFXFLUSH_IN6: 422 case SIOCSRTRFLUSH_IN6: 423 case SIOCGIFALIFETIME_IN6: 424 case SIOCSIFALIFETIME_IN6: 425 case SIOCGIFSTAT_IN6: 426 case SIOCGIFSTAT_ICMP6: 427 sa6 = &ifr->ifr_addr; 428 break; 429 case SIOCSIFADDR: 430 case SIOCSIFBRDADDR: 431 case SIOCSIFDSTADDR: 432 case SIOCSIFNETMASK: 433 /* 434 * Although we should pass any non-INET6 ioctl requests 435 * down to driver, we filter some legacy INET requests. 436 * Drivers trust SIOCSIFADDR et al to come from an already 437 * privileged layer, and do not perform any credentials 438 * checks or input validation. 439 */ 440 return (EINVAL); 441 default: 442 sa6 = NULL; 443 break; 444 } 445 if (sa6 && sa6->sin6_family == AF_INET6) { 446 if (sa6->sin6_scope_id != 0) 447 error = sa6_embedscope(sa6, 0); 448 else 449 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 450 if (error != 0) 451 return (error); 452 if (td != NULL && (error = prison_check_ip6(td->td_ucred, 453 &sa6->sin6_addr)) != 0) 454 return (error); 455 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 456 } else 457 ia = NULL; 458 459 switch (cmd) { 460 case SIOCSIFADDR_IN6: 461 case SIOCSIFDSTADDR_IN6: 462 case SIOCSIFNETMASK_IN6: 463 /* 464 * Since IPv6 allows a node to assign multiple addresses 465 * on a single interface, SIOCSIFxxx ioctls are deprecated. 466 */ 467 /* we decided to obsolete this command (20000704) */ 468 error = EINVAL; 469 goto out; 470 471 case SIOCDIFADDR_IN6: 472 /* 473 * for IPv4, we look for existing in_ifaddr here to allow 474 * "ifconfig if0 delete" to remove the first IPv4 address on 475 * the interface. For IPv6, as the spec allows multiple 476 * interface address from the day one, we consider "remove the 477 * first one" semantics to be not preferable. 478 */ 479 if (ia == NULL) { 480 error = EADDRNOTAVAIL; 481 goto out; 482 } 483 /* FALLTHROUGH */ 484 case SIOCAIFADDR_IN6: 485 /* 486 * We always require users to specify a valid IPv6 address for 487 * the corresponding operation. 488 */ 489 if (ifra->ifra_addr.sin6_family != AF_INET6 || 490 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 491 error = EAFNOSUPPORT; 492 goto out; 493 } 494 495 if (td != NULL) { 496 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 497 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR); 498 if (error) 499 goto out; 500 } 501 /* FALLTHROUGH */ 502 case SIOCGIFSTAT_IN6: 503 case SIOCGIFSTAT_ICMP6: 504 if (ifp->if_afdata[AF_INET6] == NULL) { 505 error = EPFNOSUPPORT; 506 goto out; 507 } 508 break; 509 510 case SIOCGIFADDR_IN6: 511 /* This interface is basically deprecated. use SIOCGIFCONF. */ 512 /* FALLTHROUGH */ 513 case SIOCGIFAFLAG_IN6: 514 case SIOCGIFNETMASK_IN6: 515 case SIOCGIFDSTADDR_IN6: 516 case SIOCGIFALIFETIME_IN6: 517 /* must think again about its semantics */ 518 if (ia == NULL) { 519 error = EADDRNOTAVAIL; 520 goto out; 521 } 522 break; 523 524 case SIOCSIFALIFETIME_IN6: 525 { 526 struct in6_addrlifetime *lt; 527 528 if (td != NULL) { 529 error = priv_check(td, PRIV_NETINET_ALIFETIME6); 530 if (error) 531 goto out; 532 } 533 if (ia == NULL) { 534 error = EADDRNOTAVAIL; 535 goto out; 536 } 537 /* sanity for overflow - beware unsigned */ 538 lt = &ifr->ifr_ifru.ifru_lifetime; 539 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME && 540 lt->ia6t_vltime + time_uptime < time_uptime) { 541 error = EINVAL; 542 goto out; 543 } 544 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME && 545 lt->ia6t_pltime + time_uptime < time_uptime) { 546 error = EINVAL; 547 goto out; 548 } 549 break; 550 } 551 } 552 553 switch (cmd) { 554 case SIOCGIFADDR_IN6: 555 ifr->ifr_addr = ia->ia_addr; 556 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 557 goto out; 558 break; 559 560 case SIOCGIFDSTADDR_IN6: 561 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 562 error = EINVAL; 563 goto out; 564 } 565 /* 566 * XXX: should we check if ifa_dstaddr is NULL and return 567 * an error? 568 */ 569 ifr->ifr_dstaddr = ia->ia_dstaddr; 570 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 571 goto out; 572 break; 573 574 case SIOCGIFNETMASK_IN6: 575 ifr->ifr_addr = ia->ia_prefixmask; 576 break; 577 578 case SIOCGIFAFLAG_IN6: 579 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 580 break; 581 582 case SIOCGIFSTAT_IN6: 583 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 584 ifp->if_afdata[AF_INET6])->in6_ifstat, 585 &ifr->ifr_ifru.ifru_stat, 586 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 587 break; 588 589 case SIOCGIFSTAT_ICMP6: 590 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 591 ifp->if_afdata[AF_INET6])->icmp6_ifstat, 592 &ifr->ifr_ifru.ifru_icmp6stat, 593 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 594 break; 595 596 case SIOCGIFALIFETIME_IN6: 597 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 598 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 599 time_t maxexpire; 600 struct in6_addrlifetime *retlt = 601 &ifr->ifr_ifru.ifru_lifetime; 602 603 /* 604 * XXX: adjust expiration time assuming time_t is 605 * signed. 606 */ 607 maxexpire = (-1) & 608 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 609 if (ia->ia6_lifetime.ia6t_vltime < 610 maxexpire - ia->ia6_updatetime) { 611 retlt->ia6t_expire = ia->ia6_updatetime + 612 ia->ia6_lifetime.ia6t_vltime; 613 } else 614 retlt->ia6t_expire = maxexpire; 615 } 616 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 617 time_t maxexpire; 618 struct in6_addrlifetime *retlt = 619 &ifr->ifr_ifru.ifru_lifetime; 620 621 /* 622 * XXX: adjust expiration time assuming time_t is 623 * signed. 624 */ 625 maxexpire = (-1) & 626 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 627 if (ia->ia6_lifetime.ia6t_pltime < 628 maxexpire - ia->ia6_updatetime) { 629 retlt->ia6t_preferred = ia->ia6_updatetime + 630 ia->ia6_lifetime.ia6t_pltime; 631 } else 632 retlt->ia6t_preferred = maxexpire; 633 } 634 break; 635 636 case SIOCSIFALIFETIME_IN6: 637 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; 638 /* for sanity */ 639 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 640 ia->ia6_lifetime.ia6t_expire = 641 time_uptime + ia->ia6_lifetime.ia6t_vltime; 642 } else 643 ia->ia6_lifetime.ia6t_expire = 0; 644 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 645 ia->ia6_lifetime.ia6t_preferred = 646 time_uptime + ia->ia6_lifetime.ia6t_pltime; 647 } else 648 ia->ia6_lifetime.ia6t_preferred = 0; 649 break; 650 651 case SIOCAIFADDR_IN6: 652 { 653 int i; 654 struct nd_prefixctl pr0; 655 struct nd_prefix *pr; 656 657 /* 658 * first, make or update the interface address structure, 659 * and link it to the list. 660 */ 661 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 662 goto out; 663 if (ia != NULL) 664 ifa_free(&ia->ia_ifa); 665 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 666 == NULL) { 667 /* 668 * this can happen when the user specify the 0 valid 669 * lifetime. 670 */ 671 break; 672 } 673 674 if (cmd == ocmd && ifra->ifra_vhid > 0) { 675 if (carp_attach_p != NULL) 676 error = (*carp_attach_p)(&ia->ia_ifa, 677 ifra->ifra_vhid); 678 else 679 error = EPROTONOSUPPORT; 680 if (error) 681 goto out; 682 else 683 carp_attached = 1; 684 } 685 686 /* 687 * then, make the prefix on-link on the interface. 688 * XXX: we'd rather create the prefix before the address, but 689 * we need at least one address to install the corresponding 690 * interface route, so we configure the address first. 691 */ 692 693 /* 694 * convert mask to prefix length (prefixmask has already 695 * been validated in in6_update_ifa(). 696 */ 697 bzero(&pr0, sizeof(pr0)); 698 pr0.ndpr_ifp = ifp; 699 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 700 NULL); 701 if (pr0.ndpr_plen == 128) { 702 /* we don't need to install a host route. */ 703 goto aifaddr_out; 704 } 705 pr0.ndpr_prefix = ifra->ifra_addr; 706 /* apply the mask for safety. */ 707 for (i = 0; i < 4; i++) { 708 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 709 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i]; 710 } 711 /* 712 * XXX: since we don't have an API to set prefix (not address) 713 * lifetimes, we just use the same lifetimes as addresses. 714 * The (temporarily) installed lifetimes can be overridden by 715 * later advertised RAs (when accept_rtadv is non 0), which is 716 * an intended behavior. 717 */ 718 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 719 pr0.ndpr_raf_auto = 720 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 721 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 722 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 723 724 /* add the prefix if not yet. */ 725 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 726 /* 727 * nd6_prelist_add will install the corresponding 728 * interface route. 729 */ 730 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) { 731 if (carp_attached) 732 (*carp_detach_p)(&ia->ia_ifa); 733 goto out; 734 } 735 } 736 737 /* relate the address to the prefix */ 738 if (ia->ia6_ndpr == NULL) { 739 ia->ia6_ndpr = pr; 740 pr->ndpr_refcnt++; 741 742 /* 743 * If this is the first autoconf address from the 744 * prefix, create a temporary address as well 745 * (when required). 746 */ 747 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 748 V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) { 749 int e; 750 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 751 log(LOG_NOTICE, "in6_control: failed " 752 "to create a temporary address, " 753 "errno=%d\n", e); 754 } 755 } 756 } 757 758 /* 759 * this might affect the status of autoconfigured addresses, 760 * that is, this address might make other addresses detached. 761 */ 762 pfxlist_onlink_check(); 763aifaddr_out: 764 if (error != 0 || ia == NULL) 765 break; 766 /* 767 * Try to clear the flag when a new IPv6 address is added 768 * onto an IFDISABLED interface and it succeeds. 769 */ 770 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) { 771 struct in6_ndireq nd; 772 773 memset(&nd, 0, sizeof(nd)); 774 nd.ndi.flags = ND_IFINFO(ifp)->flags; 775 nd.ndi.flags &= ~ND6_IFF_IFDISABLED; 776 if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0) 777 log(LOG_NOTICE, "SIOCAIFADDR_IN6: " 778 "SIOCSIFINFO_FLAGS for -ifdisabled " 779 "failed."); 780 /* 781 * Ignore failure of clearing the flag intentionally. 782 * The failure means address duplication was detected. 783 */ 784 } 785 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 786 break; 787 } 788 789 case SIOCDIFADDR_IN6: 790 { 791 struct nd_prefix *pr; 792 793 /* 794 * If the address being deleted is the only one that owns 795 * the corresponding prefix, expire the prefix as well. 796 * XXX: theoretically, we don't have to worry about such 797 * relationship, since we separate the address management 798 * and the prefix management. We do this, however, to provide 799 * as much backward compatibility as possible in terms of 800 * the ioctl operation. 801 * Note that in6_purgeaddr() will decrement ndpr_refcnt. 802 */ 803 pr = ia->ia6_ndpr; 804 in6_purgeaddr(&ia->ia_ifa); 805 if (pr && pr->ndpr_refcnt == 0) 806 prelist_remove(pr); 807 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 808 break; 809 } 810 811 default: 812 if (ifp->if_ioctl == NULL) { 813 error = EOPNOTSUPP; 814 goto out; 815 } 816 error = (*ifp->if_ioctl)(ifp, cmd, data); 817 goto out; 818 } 819 820 error = 0; 821out: 822 if (ia != NULL) 823 ifa_free(&ia->ia_ifa); 824 return (error); 825} 826 827 828/* 829 * Join necessary multicast groups. Factored out from in6_update_ifa(). 830 * This entire work should only be done once, for the default FIB. 831 */ 832static int 833in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra, 834 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol) 835{ 836 char ip6buf[INET6_ADDRSTRLEN]; 837 struct sockaddr_in6 mltaddr, mltmask; 838 struct in6_addr llsol; 839 struct in6_multi_mship *imm; 840 struct rtentry *rt; 841 int delay, error; 842 843 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__)); 844 845 /* Join solicited multicast addr for new host id. */ 846 bzero(&llsol, sizeof(struct in6_addr)); 847 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL; 848 llsol.s6_addr32[1] = 0; 849 llsol.s6_addr32[2] = htonl(1); 850 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 851 llsol.s6_addr8[12] = 0xff; 852 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) { 853 /* XXX: should not happen */ 854 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 855 goto cleanup; 856 } 857 delay = 0; 858 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 859 /* 860 * We need a random delay for DAD on the address being 861 * configured. It also means delaying transmission of the 862 * corresponding MLD report to avoid report collision. 863 * [RFC 4861, Section 6.3.7] 864 */ 865 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 866 } 867 imm = in6_joingroup(ifp, &llsol, &error, delay); 868 if (imm == NULL) { 869 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 870 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &llsol), 871 if_name(ifp), error)); 872 goto cleanup; 873 } 874 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 875 *in6m_sol = imm->i6mm_maddr; 876 877 bzero(&mltmask, sizeof(mltmask)); 878 mltmask.sin6_len = sizeof(struct sockaddr_in6); 879 mltmask.sin6_family = AF_INET6; 880 mltmask.sin6_addr = in6mask32; 881#define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */ 882 883 /* 884 * Join link-local all-nodes address. 885 */ 886 bzero(&mltaddr, sizeof(mltaddr)); 887 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 888 mltaddr.sin6_family = AF_INET6; 889 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 890 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 891 goto cleanup; /* XXX: should not fail */ 892 893 /* 894 * XXX: do we really need this automatic routes? We should probably 895 * reconsider this stuff. Most applications actually do not need the 896 * routes, since they usually specify the outgoing interface. 897 */ 898 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 899 if (rt != NULL) { 900 /* XXX: only works in !SCOPEDROUTING case. */ 901 if (memcmp(&mltaddr.sin6_addr, 902 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, 903 MLTMASK_LEN)) { 904 RTFREE_LOCKED(rt); 905 rt = NULL; 906 } 907 } 908 if (rt == NULL) { 909 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr, 910 (struct sockaddr *)&ia->ia_addr, 911 (struct sockaddr *)&mltmask, RTF_UP, 912 (struct rtentry **)0, RT_DEFAULT_FIB); 913 if (error) 914 goto cleanup; 915 } else 916 RTFREE_LOCKED(rt); 917 918 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 919 if (imm == NULL) { 920 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 921 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 922 &mltaddr.sin6_addr), if_name(ifp), error)); 923 goto cleanup; 924 } 925 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 926 927 /* 928 * Join node information group address. 929 */ 930 delay = 0; 931 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 932 /* 933 * The spec does not say anything about delay for this group, 934 * but the same logic should apply. 935 */ 936 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 937 } 938 if (in6_nigroup(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) { 939 /* XXX jinmei */ 940 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay); 941 if (imm == NULL) 942 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 943 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 944 &mltaddr.sin6_addr), if_name(ifp), error)); 945 /* XXX not very fatal, go on... */ 946 else 947 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 948 } 949 if (V_icmp6_nodeinfo_oldmcprefix && 950 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) { 951 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay); 952 if (imm == NULL) 953 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 954 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 955 &mltaddr.sin6_addr), if_name(ifp), error)); 956 /* XXX not very fatal, go on... */ 957 else 958 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 959 } 960 961 /* 962 * Join interface-local all-nodes address. 963 * (ff01::1%ifN, and ff01::%ifN/32) 964 */ 965 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 966 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 967 goto cleanup; /* XXX: should not fail */ 968 /* XXX: again, do we really need the route? */ 969 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 970 if (rt != NULL) { 971 if (memcmp(&mltaddr.sin6_addr, 972 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, 973 MLTMASK_LEN)) { 974 RTFREE_LOCKED(rt); 975 rt = NULL; 976 } 977 } 978 if (rt == NULL) { 979 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr, 980 (struct sockaddr *)&ia->ia_addr, 981 (struct sockaddr *)&mltmask, RTF_UP, 982 (struct rtentry **)0, RT_DEFAULT_FIB); 983 if (error) 984 goto cleanup; 985 } else 986 RTFREE_LOCKED(rt); 987 988 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 989 if (imm == NULL) { 990 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 991 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 992 &mltaddr.sin6_addr), if_name(ifp), error)); 993 goto cleanup; 994 } 995 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 996#undef MLTMASK_LEN 997 998cleanup: 999 return (error); 1000} 1001 1002/* 1003 * Update parameters of an IPv6 interface address. 1004 * If necessary, a new entry is created and linked into address chains. 1005 * This function is separated from in6_control(). 1006 */ 1007int 1008in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1009 struct in6_ifaddr *ia, int flags) 1010{ 1011 int error = 0, hostIsNew = 0, plen = -1; 1012 struct sockaddr_in6 dst6; 1013 struct in6_addrlifetime *lt; 1014 struct in6_multi *in6m_sol; 1015 int delay; 1016 char ip6buf[INET6_ADDRSTRLEN]; 1017 1018 /* Validate parameters */ 1019 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 1020 return (EINVAL); 1021 1022 /* 1023 * The destination address for a p2p link must have a family 1024 * of AF_UNSPEC or AF_INET6. 1025 */ 1026 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 1027 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 1028 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 1029 return (EAFNOSUPPORT); 1030 /* 1031 * validate ifra_prefixmask. don't check sin6_family, netmask 1032 * does not carry fields other than sin6_len. 1033 */ 1034 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 1035 return (EINVAL); 1036 /* 1037 * Because the IPv6 address architecture is classless, we require 1038 * users to specify a (non 0) prefix length (mask) for a new address. 1039 * We also require the prefix (when specified) mask is valid, and thus 1040 * reject a non-consecutive mask. 1041 */ 1042 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 1043 return (EINVAL); 1044 if (ifra->ifra_prefixmask.sin6_len != 0) { 1045 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 1046 (u_char *)&ifra->ifra_prefixmask + 1047 ifra->ifra_prefixmask.sin6_len); 1048 if (plen <= 0) 1049 return (EINVAL); 1050 } else { 1051 /* 1052 * In this case, ia must not be NULL. We just use its prefix 1053 * length. 1054 */ 1055 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1056 } 1057 /* 1058 * If the destination address on a p2p interface is specified, 1059 * and the address is a scoped one, validate/set the scope 1060 * zone identifier. 1061 */ 1062 dst6 = ifra->ifra_dstaddr; 1063 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 1064 (dst6.sin6_family == AF_INET6)) { 1065 struct in6_addr in6_tmp; 1066 u_int32_t zoneid; 1067 1068 in6_tmp = dst6.sin6_addr; 1069 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 1070 return (EINVAL); /* XXX: should be impossible */ 1071 1072 if (dst6.sin6_scope_id != 0) { 1073 if (dst6.sin6_scope_id != zoneid) 1074 return (EINVAL); 1075 } else /* user omit to specify the ID. */ 1076 dst6.sin6_scope_id = zoneid; 1077 1078 /* convert into the internal form */ 1079 if (sa6_embedscope(&dst6, 0)) 1080 return (EINVAL); /* XXX: should be impossible */ 1081 } 1082 /* 1083 * The destination address can be specified only for a p2p or a 1084 * loopback interface. If specified, the corresponding prefix length 1085 * must be 128. 1086 */ 1087 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 1088 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 1089 /* XXX: noisy message */ 1090 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 1091 "be specified for a p2p or a loopback IF only\n")); 1092 return (EINVAL); 1093 } 1094 if (plen != 128) { 1095 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 1096 "be 128 when dstaddr is specified\n")); 1097 return (EINVAL); 1098 } 1099 } 1100 /* lifetime consistency check */ 1101 lt = &ifra->ifra_lifetime; 1102 if (lt->ia6t_pltime > lt->ia6t_vltime) 1103 return (EINVAL); 1104 if (lt->ia6t_vltime == 0) { 1105 /* 1106 * the following log might be noisy, but this is a typical 1107 * configuration mistake or a tool's bug. 1108 */ 1109 nd6log((LOG_INFO, 1110 "in6_update_ifa: valid lifetime is 0 for %s\n", 1111 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr))); 1112 1113 if (ia == NULL) 1114 return (0); /* there's nothing to do */ 1115 } 1116 1117 /* 1118 * If this is a new address, allocate a new ifaddr and link it 1119 * into chains. 1120 */ 1121 if (ia == NULL) { 1122 hostIsNew = 1; 1123 /* 1124 * When in6_update_ifa() is called in a process of a received 1125 * RA, it is called under an interrupt context. So, we should 1126 * call malloc with M_NOWAIT. 1127 */ 1128 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR, 1129 M_NOWAIT); 1130 if (ia == NULL) 1131 return (ENOBUFS); 1132 bzero((caddr_t)ia, sizeof(*ia)); 1133 ifa_init(&ia->ia_ifa); 1134 LIST_INIT(&ia->ia6_memberships); 1135 /* Initialize the address and masks, and put time stamp */ 1136 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1137 ia->ia_addr.sin6_family = AF_INET6; 1138 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 1139 ia->ia6_createtime = time_uptime; 1140 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1141 /* 1142 * XXX: some functions expect that ifa_dstaddr is not 1143 * NULL for p2p interfaces. 1144 */ 1145 ia->ia_ifa.ifa_dstaddr = 1146 (struct sockaddr *)&ia->ia_dstaddr; 1147 } else { 1148 ia->ia_ifa.ifa_dstaddr = NULL; 1149 } 1150 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 1151 ia->ia_ifp = ifp; 1152 ifa_ref(&ia->ia_ifa); /* if_addrhead */ 1153 IF_ADDR_WLOCK(ifp); 1154 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1155 IF_ADDR_WUNLOCK(ifp); 1156 1157 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */ 1158 IN6_IFADDR_WLOCK(); 1159 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link); 1160 LIST_INSERT_HEAD(IN6ADDR_HASH(&ifra->ifra_addr.sin6_addr), 1161 ia, ia6_hash); 1162 IN6_IFADDR_WUNLOCK(); 1163 } 1164 1165 /* update timestamp */ 1166 ia->ia6_updatetime = time_uptime; 1167 1168 /* set prefix mask */ 1169 if (ifra->ifra_prefixmask.sin6_len) { 1170 /* 1171 * We prohibit changing the prefix length of an existing 1172 * address, because 1173 * + such an operation should be rare in IPv6, and 1174 * + the operation would confuse prefix management. 1175 */ 1176 if (ia->ia_prefixmask.sin6_len && 1177 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 1178 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an" 1179 " existing (%s) address should not be changed\n", 1180 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1181 error = EINVAL; 1182 goto unlink; 1183 } 1184 ia->ia_prefixmask = ifra->ifra_prefixmask; 1185 ia->ia_prefixmask.sin6_family = AF_INET6; 1186 } 1187 1188 /* 1189 * If a new destination address is specified, scrub the old one and 1190 * install the new destination. Note that the interface must be 1191 * p2p or loopback (see the check above.) 1192 */ 1193 if (dst6.sin6_family == AF_INET6 && 1194 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1195 int e; 1196 1197 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1198 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) { 1199 nd6log((LOG_ERR, "in6_update_ifa: failed to remove " 1200 "a route to the old destination: %s\n", 1201 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1202 /* proceed anyway... */ 1203 } else 1204 ia->ia_flags &= ~IFA_ROUTE; 1205 ia->ia_dstaddr = dst6; 1206 } 1207 1208 /* 1209 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1210 * to see if the address is deprecated or invalidated, but initialize 1211 * these members for applications. 1212 */ 1213 ia->ia6_lifetime = ifra->ifra_lifetime; 1214 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1215 ia->ia6_lifetime.ia6t_expire = 1216 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1217 } else 1218 ia->ia6_lifetime.ia6t_expire = 0; 1219 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1220 ia->ia6_lifetime.ia6t_preferred = 1221 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1222 } else 1223 ia->ia6_lifetime.ia6t_preferred = 0; 1224 1225 /* reset the interface and routing table appropriately. */ 1226 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 1227 goto unlink; 1228 1229 /* 1230 * configure address flags. 1231 */ 1232 ia->ia6_flags = ifra->ifra_flags; 1233 /* 1234 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1235 * userland, make it deprecated. 1236 */ 1237 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1238 ia->ia6_lifetime.ia6t_pltime = 0; 1239 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1240 } 1241 /* 1242 * Make the address tentative before joining multicast addresses, 1243 * so that corresponding MLD responses would not have a tentative 1244 * source address. 1245 */ 1246 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1247 1248 /* 1249 * DAD should be performed for an new address or addresses on 1250 * an interface with ND6_IFF_IFDISABLED. 1251 */ 1252 if (in6if_do_dad(ifp) && 1253 (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED))) 1254 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1255 1256 /* 1257 * We are done if we have simply modified an existing address. 1258 */ 1259 if (!hostIsNew) 1260 return (error); 1261 1262 /* 1263 * Beyond this point, we should call in6_purgeaddr upon an error, 1264 * not just go to unlink. 1265 */ 1266 1267 /* Join necessary multicast groups. */ 1268 in6m_sol = NULL; 1269 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1270 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol); 1271 if (error) 1272 goto cleanup; 1273 } 1274 1275 /* Perform DAD, if the address is TENTATIVE. */ 1276 if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) { 1277 int mindelay, maxdelay; 1278 1279 delay = 0; 1280 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1281 /* 1282 * We need to impose a delay before sending an NS 1283 * for DAD. Check if we also needed a delay for the 1284 * corresponding MLD message. If we did, the delay 1285 * should be larger than the MLD delay (this could be 1286 * relaxed a bit, but this simple logic is at least 1287 * safe). 1288 * XXX: Break data hiding guidelines and look at 1289 * state for the solicited multicast group. 1290 */ 1291 mindelay = 0; 1292 if (in6m_sol != NULL && 1293 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) { 1294 mindelay = in6m_sol->in6m_timer; 1295 } 1296 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1297 if (maxdelay - mindelay == 0) 1298 delay = 0; 1299 else { 1300 delay = 1301 (arc4random() % (maxdelay - mindelay)) + 1302 mindelay; 1303 } 1304 } 1305 nd6_dad_start((struct ifaddr *)ia, delay); 1306 } 1307 1308 KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew")); 1309 ifa_free(&ia->ia_ifa); 1310 return (error); 1311 1312 unlink: 1313 /* 1314 * XXX: if a change of an existing address failed, keep the entry 1315 * anyway. 1316 */ 1317 if (hostIsNew) { 1318 in6_unlink_ifa(ia, ifp); 1319 ifa_free(&ia->ia_ifa); 1320 } 1321 return (error); 1322 1323 cleanup: 1324 KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew")); 1325 ifa_free(&ia->ia_ifa); 1326 in6_purgeaddr(&ia->ia_ifa); 1327 return error; 1328} 1329 1330/* 1331 * Leave multicast groups. Factored out from in6_purgeaddr(). 1332 * This entire work should only be done once, for the default FIB. 1333 */ 1334static int 1335in6_purgeaddr_mc(struct ifnet *ifp, struct in6_ifaddr *ia, struct ifaddr *ifa0) 1336{ 1337 struct sockaddr_in6 mltaddr, mltmask; 1338 struct in6_multi_mship *imm; 1339 struct rtentry *rt; 1340 struct sockaddr_in6 sin6; 1341 int error; 1342 1343 /* 1344 * Leave from multicast groups we have joined for the interface. 1345 */ 1346 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1347 LIST_REMOVE(imm, i6mm_chain); 1348 in6_leavegroup(imm); 1349 } 1350 1351 /* 1352 * Remove the link-local all-nodes address. 1353 */ 1354 bzero(&mltmask, sizeof(mltmask)); 1355 mltmask.sin6_len = sizeof(struct sockaddr_in6); 1356 mltmask.sin6_family = AF_INET6; 1357 mltmask.sin6_addr = in6mask32; 1358 1359 bzero(&mltaddr, sizeof(mltaddr)); 1360 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 1361 mltaddr.sin6_family = AF_INET6; 1362 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 1363 1364 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1365 return (error); 1366 1367 /* 1368 * As for the mltaddr above, proactively prepare the sin6 to avoid 1369 * rtentry un- and re-locking. 1370 */ 1371 if (ifa0 != NULL) { 1372 bzero(&sin6, sizeof(sin6)); 1373 sin6.sin6_len = sizeof(sin6); 1374 sin6.sin6_family = AF_INET6; 1375 memcpy(&sin6.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, 1376 sizeof(sin6.sin6_addr)); 1377 error = in6_setscope(&sin6.sin6_addr, ifa0->ifa_ifp, NULL); 1378 if (error != 0) 1379 return (error); 1380 } 1381 1382 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 1383 if (rt != NULL && rt->rt_gateway != NULL && 1384 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 1385 &ia->ia_addr.sin6_addr, 1386 sizeof(ia->ia_addr.sin6_addr)) == 0)) { 1387 /* 1388 * If no more IPv6 address exists on this interface then 1389 * remove the multicast address route. 1390 */ 1391 if (ifa0 == NULL) { 1392 memcpy(&mltaddr.sin6_addr, 1393 &satosin6(rt_key(rt))->sin6_addr, 1394 sizeof(mltaddr.sin6_addr)); 1395 RTFREE_LOCKED(rt); 1396 error = in6_rtrequest(RTM_DELETE, 1397 (struct sockaddr *)&mltaddr, 1398 (struct sockaddr *)&ia->ia_addr, 1399 (struct sockaddr *)&mltmask, RTF_UP, 1400 (struct rtentry **)0, RT_DEFAULT_FIB); 1401 if (error) 1402 log(LOG_INFO, "%s: link-local all-nodes " 1403 "multicast address deletion error\n", 1404 __func__); 1405 } else { 1406 /* 1407 * Replace the gateway of the route. 1408 */ 1409 memcpy(rt->rt_gateway, &sin6, sizeof(sin6)); 1410 RTFREE_LOCKED(rt); 1411 } 1412 } else { 1413 if (rt != NULL) 1414 RTFREE_LOCKED(rt); 1415 } 1416 1417 /* 1418 * Remove the node-local all-nodes address. 1419 */ 1420 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1421 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1422 return (error); 1423 1424 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 1425 if (rt != NULL && rt->rt_gateway != NULL && 1426 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 1427 &ia->ia_addr.sin6_addr, 1428 sizeof(ia->ia_addr.sin6_addr)) == 0)) { 1429 /* 1430 * If no more IPv6 address exists on this interface then 1431 * remove the multicast address route. 1432 */ 1433 if (ifa0 == NULL) { 1434 memcpy(&mltaddr.sin6_addr, 1435 &satosin6(rt_key(rt))->sin6_addr, 1436 sizeof(mltaddr.sin6_addr)); 1437 1438 RTFREE_LOCKED(rt); 1439 error = in6_rtrequest(RTM_DELETE, 1440 (struct sockaddr *)&mltaddr, 1441 (struct sockaddr *)&ia->ia_addr, 1442 (struct sockaddr *)&mltmask, RTF_UP, 1443 (struct rtentry **)0, RT_DEFAULT_FIB); 1444 if (error) 1445 log(LOG_INFO, "%s: node-local all-nodes" 1446 "multicast address deletion error\n", 1447 __func__); 1448 } else { 1449 /* 1450 * Replace the gateway of the route. 1451 */ 1452 memcpy(rt->rt_gateway, &sin6, sizeof(sin6)); 1453 RTFREE_LOCKED(rt); 1454 } 1455 } else { 1456 if (rt != NULL) 1457 RTFREE_LOCKED(rt); 1458 } 1459 1460 return (0); 1461} 1462 1463void 1464in6_purgeaddr(struct ifaddr *ifa) 1465{ 1466 struct ifnet *ifp = ifa->ifa_ifp; 1467 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1468 int plen, error; 1469 struct ifaddr *ifa0; 1470 1471 if (ifa->ifa_carp) 1472 (*carp_detach_p)(ifa); 1473 1474 /* 1475 * find another IPv6 address as the gateway for the 1476 * link-local and node-local all-nodes multicast 1477 * address routes 1478 */ 1479 IF_ADDR_RLOCK(ifp); 1480 TAILQ_FOREACH(ifa0, &ifp->if_addrhead, ifa_link) { 1481 if ((ifa0->ifa_addr->sa_family != AF_INET6) || 1482 memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr, 1483 &ia->ia_addr.sin6_addr, sizeof(struct in6_addr)) == 0) 1484 continue; 1485 else 1486 break; 1487 } 1488 if (ifa0 != NULL) 1489 ifa_ref(ifa0); 1490 IF_ADDR_RUNLOCK(ifp); 1491 1492 /* 1493 * Remove the loopback route to the interface address. 1494 * The check for the current setting of "nd6_useloopback" 1495 * is not needed. 1496 */ 1497 if (ia->ia_flags & IFA_RTSELF) { 1498 error = ifa_del_loopback_route((struct ifaddr *)ia, 1499 (struct sockaddr *)&ia->ia_addr); 1500 if (error == 0) 1501 ia->ia_flags &= ~IFA_RTSELF; 1502 } 1503 1504 /* stop DAD processing */ 1505 nd6_dad_stop(ifa); 1506 1507 /* Remove local address entry from lltable. */ 1508 in6_ifremloop(ifa); 1509 1510 /* Leave multicast groups. */ 1511 error = in6_purgeaddr_mc(ifp, ia, ifa0); 1512 1513 if (ifa0 != NULL) 1514 ifa_free(ifa0); 1515 1516 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1517 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) { 1518 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags | 1519 (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0); 1520 if (error != 0) 1521 log(LOG_INFO, "%s: err=%d, destination address delete " 1522 "failed\n", __func__, error); 1523 ia->ia_flags &= ~IFA_ROUTE; 1524 } 1525 1526 in6_unlink_ifa(ia, ifp); 1527} 1528 1529static void 1530in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1531{ 1532 char ip6buf[INET6_ADDRSTRLEN]; 1533 1534 IF_ADDR_WLOCK(ifp); 1535 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1536 IF_ADDR_WUNLOCK(ifp); 1537 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1538 1539 /* 1540 * Defer the release of what might be the last reference to the 1541 * in6_ifaddr so that it can't be freed before the remainder of the 1542 * cleanup. 1543 */ 1544 IN6_IFADDR_WLOCK(); 1545 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 1546 LIST_REMOVE(ia, ia6_hash); 1547 IN6_IFADDR_WUNLOCK(); 1548 1549 /* 1550 * Release the reference to the base prefix. There should be a 1551 * positive reference. 1552 */ 1553 if (ia->ia6_ndpr == NULL) { 1554 nd6log((LOG_NOTICE, 1555 "in6_unlink_ifa: autoconf'ed address " 1556 "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia)))); 1557 } else { 1558 ia->ia6_ndpr->ndpr_refcnt--; 1559 ia->ia6_ndpr = NULL; 1560 } 1561 1562 /* 1563 * Also, if the address being removed is autoconf'ed, call 1564 * pfxlist_onlink_check() since the release might affect the status of 1565 * other (detached) addresses. 1566 */ 1567 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1568 pfxlist_onlink_check(); 1569 } 1570 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1571} 1572 1573void 1574in6_purgeif(struct ifnet *ifp) 1575{ 1576 struct ifaddr *ifa, *nifa; 1577 1578 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) { 1579 if (ifa->ifa_addr->sa_family != AF_INET6) 1580 continue; 1581 in6_purgeaddr(ifa); 1582 } 1583 1584 in6_ifdetach(ifp); 1585} 1586 1587/* 1588 * SIOC[GAD]LIFADDR. 1589 * SIOCGLIFADDR: get first address. (?) 1590 * SIOCGLIFADDR with IFLR_PREFIX: 1591 * get first address that matches the specified prefix. 1592 * SIOCALIFADDR: add the specified address. 1593 * SIOCALIFADDR with IFLR_PREFIX: 1594 * add the specified prefix, filling hostid part from 1595 * the first link-local address. prefixlen must be <= 64. 1596 * SIOCDLIFADDR: delete the specified address. 1597 * SIOCDLIFADDR with IFLR_PREFIX: 1598 * delete the first address that matches the specified prefix. 1599 * return values: 1600 * EINVAL on invalid parameters 1601 * EADDRNOTAVAIL on prefix match failed/specified address not found 1602 * other values may be returned from in6_ioctl() 1603 * 1604 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1605 * this is to accomodate address naming scheme other than RFC2374, 1606 * in the future. 1607 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1608 * address encoding scheme. (see figure on page 8) 1609 * Notifies other subsystems about address change/arrival: 1610 * 1) Notifies device handler on the first IPv6 address assignment 1611 * 2) Handle routing table changes for P2P links and route 1612 * 3) Handle routing table changes for address host route 1613 */ 1614static int 1615in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 1616 struct ifnet *ifp, struct thread *td) 1617{ 1618 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1619 struct ifaddr *ifa; 1620 struct sockaddr *sa; 1621 1622 /* sanity checks */ 1623 if (!data || !ifp) { 1624 panic("invalid argument to in6_lifaddr_ioctl"); 1625 /* NOTREACHED */ 1626 } 1627 1628 switch (cmd) { 1629 case SIOCGLIFADDR: 1630 /* address must be specified on GET with IFLR_PREFIX */ 1631 if ((iflr->flags & IFLR_PREFIX) == 0) 1632 break; 1633 /* FALLTHROUGH */ 1634 case SIOCALIFADDR: 1635 case SIOCDLIFADDR: 1636 /* address must be specified on ADD and DELETE */ 1637 sa = (struct sockaddr *)&iflr->addr; 1638 if (sa->sa_family != AF_INET6) 1639 return EINVAL; 1640 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1641 return EINVAL; 1642 /* XXX need improvement */ 1643 sa = (struct sockaddr *)&iflr->dstaddr; 1644 if (sa->sa_family && sa->sa_family != AF_INET6) 1645 return EINVAL; 1646 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1647 return EINVAL; 1648 break; 1649 default: /* shouldn't happen */ 1650#if 0 1651 panic("invalid cmd to in6_lifaddr_ioctl"); 1652 /* NOTREACHED */ 1653#else 1654 return EOPNOTSUPP; 1655#endif 1656 } 1657 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) 1658 return EINVAL; 1659 1660 switch (cmd) { 1661 case SIOCALIFADDR: 1662 { 1663 struct in6_aliasreq ifra; 1664 struct in6_addr *hostid = NULL; 1665 int prefixlen; 1666 1667 ifa = NULL; 1668 if ((iflr->flags & IFLR_PREFIX) != 0) { 1669 struct sockaddr_in6 *sin6; 1670 1671 /* 1672 * hostid is to fill in the hostid part of the 1673 * address. hostid points to the first link-local 1674 * address attached to the interface. 1675 */ 1676 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1677 if (!ifa) 1678 return EADDRNOTAVAIL; 1679 hostid = IFA_IN6(ifa); 1680 1681 /* prefixlen must be <= 64. */ 1682 if (64 < iflr->prefixlen) { 1683 if (ifa != NULL) 1684 ifa_free(ifa); 1685 return EINVAL; 1686 } 1687 prefixlen = iflr->prefixlen; 1688 1689 /* hostid part must be zero. */ 1690 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1691 if (sin6->sin6_addr.s6_addr32[2] != 0 || 1692 sin6->sin6_addr.s6_addr32[3] != 0) { 1693 if (ifa != NULL) 1694 ifa_free(ifa); 1695 return EINVAL; 1696 } 1697 } else 1698 prefixlen = iflr->prefixlen; 1699 1700 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1701 bzero(&ifra, sizeof(ifra)); 1702 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name)); 1703 1704 bcopy(&iflr->addr, &ifra.ifra_addr, 1705 ((struct sockaddr *)&iflr->addr)->sa_len); 1706 if (hostid) { 1707 /* fill in hostid part */ 1708 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1709 hostid->s6_addr32[2]; 1710 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1711 hostid->s6_addr32[3]; 1712 } 1713 1714 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1715 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1716 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1717 if (hostid) { 1718 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1719 hostid->s6_addr32[2]; 1720 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1721 hostid->s6_addr32[3]; 1722 } 1723 } 1724 if (ifa != NULL) 1725 ifa_free(ifa); 1726 1727 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1728 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1729 1730 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1731 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td); 1732 } 1733 case SIOCGLIFADDR: 1734 case SIOCDLIFADDR: 1735 { 1736 struct in6_ifaddr *ia; 1737 struct in6_addr mask, candidate, match; 1738 struct sockaddr_in6 *sin6; 1739 int cmp; 1740 1741 bzero(&mask, sizeof(mask)); 1742 if (iflr->flags & IFLR_PREFIX) { 1743 /* lookup a prefix rather than address. */ 1744 in6_prefixlen2mask(&mask, iflr->prefixlen); 1745 1746 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1747 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1748 match.s6_addr32[0] &= mask.s6_addr32[0]; 1749 match.s6_addr32[1] &= mask.s6_addr32[1]; 1750 match.s6_addr32[2] &= mask.s6_addr32[2]; 1751 match.s6_addr32[3] &= mask.s6_addr32[3]; 1752 1753 /* if you set extra bits, that's wrong */ 1754 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1755 return EINVAL; 1756 1757 cmp = 1; 1758 } else { 1759 if (cmd == SIOCGLIFADDR) { 1760 /* on getting an address, take the 1st match */ 1761 cmp = 0; /* XXX */ 1762 } else { 1763 /* on deleting an address, do exact match */ 1764 in6_prefixlen2mask(&mask, 128); 1765 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1766 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1767 1768 cmp = 1; 1769 } 1770 } 1771 1772 IF_ADDR_RLOCK(ifp); 1773 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1774 if (ifa->ifa_addr->sa_family != AF_INET6) 1775 continue; 1776 if (!cmp) 1777 break; 1778 1779 /* 1780 * XXX: this is adhoc, but is necessary to allow 1781 * a user to specify fe80::/64 (not /10) for a 1782 * link-local address. 1783 */ 1784 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1785 in6_clearscope(&candidate); 1786 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1787 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1788 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1789 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1790 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1791 break; 1792 } 1793 if (ifa != NULL) 1794 ifa_ref(ifa); 1795 IF_ADDR_RUNLOCK(ifp); 1796 if (!ifa) 1797 return EADDRNOTAVAIL; 1798 ia = ifa2ia6(ifa); 1799 1800 if (cmd == SIOCGLIFADDR) { 1801 int error; 1802 1803 /* fill in the if_laddrreq structure */ 1804 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1805 error = sa6_recoverscope( 1806 (struct sockaddr_in6 *)&iflr->addr); 1807 if (error != 0) { 1808 ifa_free(ifa); 1809 return (error); 1810 } 1811 1812 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1813 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1814 ia->ia_dstaddr.sin6_len); 1815 error = sa6_recoverscope( 1816 (struct sockaddr_in6 *)&iflr->dstaddr); 1817 if (error != 0) { 1818 ifa_free(ifa); 1819 return (error); 1820 } 1821 } else 1822 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1823 1824 iflr->prefixlen = 1825 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1826 1827 iflr->flags = ia->ia6_flags; /* XXX */ 1828 ifa_free(ifa); 1829 1830 return 0; 1831 } else { 1832 struct in6_aliasreq ifra; 1833 1834 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1835 bzero(&ifra, sizeof(ifra)); 1836 bcopy(iflr->iflr_name, ifra.ifra_name, 1837 sizeof(ifra.ifra_name)); 1838 1839 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1840 ia->ia_addr.sin6_len); 1841 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1842 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1843 ia->ia_dstaddr.sin6_len); 1844 } else { 1845 bzero(&ifra.ifra_dstaddr, 1846 sizeof(ifra.ifra_dstaddr)); 1847 } 1848 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1849 ia->ia_prefixmask.sin6_len); 1850 1851 ifra.ifra_flags = ia->ia6_flags; 1852 ifa_free(ifa); 1853 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, 1854 ifp, td); 1855 } 1856 } 1857 } 1858 1859 return EOPNOTSUPP; /* just for safety */ 1860} 1861 1862/* 1863 * Initialize an interface's IPv6 address and routing table entry. 1864 */ 1865static int 1866in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1867 struct sockaddr_in6 *sin6, int newhost) 1868{ 1869 int error = 0, plen, ifacount = 0; 1870 struct ifaddr *ifa; 1871 1872 /* 1873 * Give the interface a chance to initialize 1874 * if this is its first address, 1875 * and to validate the address if necessary. 1876 */ 1877 IF_ADDR_RLOCK(ifp); 1878 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1879 if (ifa->ifa_addr->sa_family != AF_INET6) 1880 continue; 1881 ifacount++; 1882 } 1883 IF_ADDR_RUNLOCK(ifp); 1884 1885 ia->ia_addr = *sin6; 1886 1887 if (ifacount <= 1 && ifp->if_ioctl) { 1888 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1889 if (error) 1890 return (error); 1891 } 1892 1893 ia->ia_ifa.ifa_metric = ifp->if_metric; 1894 1895 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1896 1897 /* 1898 * Special case: 1899 * If a new destination address is specified for a point-to-point 1900 * interface, install a route to the destination as an interface 1901 * direct route. 1902 * XXX: the logic below rejects assigning multiple addresses on a p2p 1903 * interface that share the same destination. 1904 */ 1905 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1906 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 && 1907 ia->ia_dstaddr.sin6_family == AF_INET6) { 1908 int rtflags = RTF_UP | RTF_HOST; 1909 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags); 1910 if (error) 1911 return (error); 1912 ia->ia_flags |= IFA_ROUTE; 1913 /* 1914 * Handle the case for ::1 . 1915 */ 1916 if (ifp->if_flags & IFF_LOOPBACK) 1917 ia->ia_flags |= IFA_RTSELF; 1918 } 1919 1920 /* 1921 * add a loopback route to self 1922 */ 1923 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) { 1924 error = ifa_add_loopback_route((struct ifaddr *)ia, 1925 (struct sockaddr *)&ia->ia_addr); 1926 if (error == 0) 1927 ia->ia_flags |= IFA_RTSELF; 1928 } 1929 1930 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1931 if (newhost) 1932 in6_ifaddloop(&(ia->ia_ifa)); 1933 1934 return (error); 1935} 1936 1937/* 1938 * Find an IPv6 interface link-local address specific to an interface. 1939 * ifaddr is returned referenced. 1940 */ 1941struct in6_ifaddr * 1942in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1943{ 1944 struct ifaddr *ifa; 1945 1946 IF_ADDR_RLOCK(ifp); 1947 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1948 if (ifa->ifa_addr->sa_family != AF_INET6) 1949 continue; 1950 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1951 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1952 ignoreflags) != 0) 1953 continue; 1954 ifa_ref(ifa); 1955 break; 1956 } 1957 } 1958 IF_ADDR_RUNLOCK(ifp); 1959 1960 return ((struct in6_ifaddr *)ifa); 1961} 1962 1963 1964/* 1965 * find the internet address corresponding to a given interface and address. 1966 * ifaddr is returned referenced. 1967 */ 1968struct in6_ifaddr * 1969in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr) 1970{ 1971 struct ifaddr *ifa; 1972 1973 IF_ADDR_RLOCK(ifp); 1974 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1975 if (ifa->ifa_addr->sa_family != AF_INET6) 1976 continue; 1977 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1978 ifa_ref(ifa); 1979 break; 1980 } 1981 } 1982 IF_ADDR_RUNLOCK(ifp); 1983 1984 return ((struct in6_ifaddr *)ifa); 1985} 1986 1987/* 1988 * Find a link-local scoped address on ifp and return it if any. 1989 */ 1990struct in6_ifaddr * 1991in6ifa_llaonifp(struct ifnet *ifp) 1992{ 1993 struct sockaddr_in6 *sin6; 1994 struct ifaddr *ifa; 1995 1996 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1997 return (NULL); 1998 IF_ADDR_RLOCK(ifp); 1999 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2000 if (ifa->ifa_addr->sa_family != AF_INET6) 2001 continue; 2002 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 2003 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 2004 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) || 2005 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr)) 2006 break; 2007 } 2008 IF_ADDR_RUNLOCK(ifp); 2009 2010 return ((struct in6_ifaddr *)ifa); 2011} 2012 2013/* 2014 * Convert IP6 address to printable (loggable) representation. Caller 2015 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 2016 */ 2017static char digits[] = "0123456789abcdef"; 2018char * 2019ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 2020{ 2021 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0; 2022 char *cp; 2023 const u_int16_t *a = (const u_int16_t *)addr; 2024 const u_int8_t *d; 2025 int dcolon = 0, zero = 0; 2026 2027 cp = ip6buf; 2028 2029 for (i = 0; i < 8; i++) { 2030 if (*(a + i) == 0) { 2031 cnt++; 2032 if (cnt == 1) 2033 idx = i; 2034 } 2035 else if (maxcnt < cnt) { 2036 maxcnt = cnt; 2037 index = idx; 2038 cnt = 0; 2039 } 2040 } 2041 if (maxcnt < cnt) { 2042 maxcnt = cnt; 2043 index = idx; 2044 } 2045 2046 for (i = 0; i < 8; i++) { 2047 if (dcolon == 1) { 2048 if (*a == 0) { 2049 if (i == 7) 2050 *cp++ = ':'; 2051 a++; 2052 continue; 2053 } else 2054 dcolon = 2; 2055 } 2056 if (*a == 0) { 2057 if (dcolon == 0 && *(a + 1) == 0 && i == index) { 2058 if (i == 0) 2059 *cp++ = ':'; 2060 *cp++ = ':'; 2061 dcolon = 1; 2062 } else { 2063 *cp++ = '0'; 2064 *cp++ = ':'; 2065 } 2066 a++; 2067 continue; 2068 } 2069 d = (const u_char *)a; 2070 /* Try to eliminate leading zeros in printout like in :0001. */ 2071 zero = 1; 2072 *cp = digits[*d >> 4]; 2073 if (*cp != '0') { 2074 zero = 0; 2075 cp++; 2076 } 2077 *cp = digits[*d++ & 0xf]; 2078 if (zero == 0 || (*cp != '0')) { 2079 zero = 0; 2080 cp++; 2081 } 2082 *cp = digits[*d >> 4]; 2083 if (zero == 0 || (*cp != '0')) { 2084 zero = 0; 2085 cp++; 2086 } 2087 *cp++ = digits[*d & 0xf]; 2088 *cp++ = ':'; 2089 a++; 2090 } 2091 *--cp = '\0'; 2092 return (ip6buf); 2093} 2094 2095int 2096in6_localaddr(struct in6_addr *in6) 2097{ 2098 struct in6_ifaddr *ia; 2099 2100 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 2101 return 1; 2102 2103 IN6_IFADDR_RLOCK(); 2104 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 2105 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 2106 &ia->ia_prefixmask.sin6_addr)) { 2107 IN6_IFADDR_RUNLOCK(); 2108 return 1; 2109 } 2110 } 2111 IN6_IFADDR_RUNLOCK(); 2112 2113 return (0); 2114} 2115 2116/* 2117 * Return 1 if an internet address is for the local host and configured 2118 * on one of its interfaces. 2119 */ 2120int 2121in6_localip(struct in6_addr *in6) 2122{ 2123 struct in6_ifaddr *ia; 2124 2125 IN6_IFADDR_RLOCK(); 2126 LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 2127 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) { 2128 IN6_IFADDR_RUNLOCK(); 2129 return (1); 2130 } 2131 } 2132 IN6_IFADDR_RUNLOCK(); 2133 return (0); 2134} 2135 2136int 2137in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 2138{ 2139 struct in6_ifaddr *ia; 2140 2141 IN6_IFADDR_RLOCK(); 2142 LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) { 2143 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) { 2144 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2145 IN6_IFADDR_RUNLOCK(); 2146 return (1); /* true */ 2147 } 2148 break; 2149 } 2150 } 2151 IN6_IFADDR_RUNLOCK(); 2152 2153 return (0); /* false */ 2154} 2155 2156/* 2157 * return length of part which dst and src are equal 2158 * hard coding... 2159 */ 2160int 2161in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 2162{ 2163 int match = 0; 2164 u_char *s = (u_char *)src, *d = (u_char *)dst; 2165 u_char *lim = s + 16, r; 2166 2167 while (s < lim) 2168 if ((r = (*d++ ^ *s++)) != 0) { 2169 while (r < 128) { 2170 match++; 2171 r <<= 1; 2172 } 2173 break; 2174 } else 2175 match += 8; 2176 return match; 2177} 2178 2179/* XXX: to be scope conscious */ 2180int 2181in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 2182{ 2183 int bytelen, bitlen; 2184 2185 /* sanity check */ 2186 if (0 > len || len > 128) { 2187 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 2188 len); 2189 return (0); 2190 } 2191 2192 bytelen = len / 8; 2193 bitlen = len % 8; 2194 2195 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 2196 return (0); 2197 if (bitlen != 0 && 2198 p1->s6_addr[bytelen] >> (8 - bitlen) != 2199 p2->s6_addr[bytelen] >> (8 - bitlen)) 2200 return (0); 2201 2202 return (1); 2203} 2204 2205void 2206in6_prefixlen2mask(struct in6_addr *maskp, int len) 2207{ 2208 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 2209 int bytelen, bitlen, i; 2210 2211 /* sanity check */ 2212 if (0 > len || len > 128) { 2213 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 2214 len); 2215 return; 2216 } 2217 2218 bzero(maskp, sizeof(*maskp)); 2219 bytelen = len / 8; 2220 bitlen = len % 8; 2221 for (i = 0; i < bytelen; i++) 2222 maskp->s6_addr[i] = 0xff; 2223 if (bitlen) 2224 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 2225} 2226 2227/* 2228 * return the best address out of the same scope. if no address was 2229 * found, return the first valid address from designated IF. 2230 */ 2231struct in6_ifaddr * 2232in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2233{ 2234 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2235 struct ifaddr *ifa; 2236 struct in6_ifaddr *besta = 0; 2237 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2238 2239 dep[0] = dep[1] = NULL; 2240 2241 /* 2242 * We first look for addresses in the same scope. 2243 * If there is one, return it. 2244 * If two or more, return one which matches the dst longest. 2245 * If none, return one of global addresses assigned other ifs. 2246 */ 2247 IF_ADDR_RLOCK(ifp); 2248 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2249 if (ifa->ifa_addr->sa_family != AF_INET6) 2250 continue; 2251 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2252 continue; /* XXX: is there any case to allow anycast? */ 2253 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2254 continue; /* don't use this interface */ 2255 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2256 continue; 2257 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2258 if (V_ip6_use_deprecated) 2259 dep[0] = (struct in6_ifaddr *)ifa; 2260 continue; 2261 } 2262 2263 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2264 /* 2265 * call in6_matchlen() as few as possible 2266 */ 2267 if (besta) { 2268 if (blen == -1) 2269 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2270 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2271 if (tlen > blen) { 2272 blen = tlen; 2273 besta = (struct in6_ifaddr *)ifa; 2274 } 2275 } else 2276 besta = (struct in6_ifaddr *)ifa; 2277 } 2278 } 2279 if (besta) { 2280 ifa_ref(&besta->ia_ifa); 2281 IF_ADDR_RUNLOCK(ifp); 2282 return (besta); 2283 } 2284 2285 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2286 if (ifa->ifa_addr->sa_family != AF_INET6) 2287 continue; 2288 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2289 continue; /* XXX: is there any case to allow anycast? */ 2290 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2291 continue; /* don't use this interface */ 2292 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2293 continue; 2294 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2295 if (V_ip6_use_deprecated) 2296 dep[1] = (struct in6_ifaddr *)ifa; 2297 continue; 2298 } 2299 2300 if (ifa != NULL) 2301 ifa_ref(ifa); 2302 IF_ADDR_RUNLOCK(ifp); 2303 return (struct in6_ifaddr *)ifa; 2304 } 2305 2306 /* use the last-resort values, that are, deprecated addresses */ 2307 if (dep[0]) { 2308 ifa_ref((struct ifaddr *)dep[0]); 2309 IF_ADDR_RUNLOCK(ifp); 2310 return dep[0]; 2311 } 2312 if (dep[1]) { 2313 ifa_ref((struct ifaddr *)dep[1]); 2314 IF_ADDR_RUNLOCK(ifp); 2315 return dep[1]; 2316 } 2317 2318 IF_ADDR_RUNLOCK(ifp); 2319 return NULL; 2320} 2321 2322/* 2323 * perform DAD when interface becomes IFF_UP. 2324 */ 2325void 2326in6_if_up(struct ifnet *ifp) 2327{ 2328 struct ifaddr *ifa; 2329 struct in6_ifaddr *ia; 2330 2331 IF_ADDR_RLOCK(ifp); 2332 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2333 if (ifa->ifa_addr->sa_family != AF_INET6) 2334 continue; 2335 ia = (struct in6_ifaddr *)ifa; 2336 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2337 /* 2338 * The TENTATIVE flag was likely set by hand 2339 * beforehand, implicitly indicating the need for DAD. 2340 * We may be able to skip the random delay in this 2341 * case, but we impose delays just in case. 2342 */ 2343 nd6_dad_start(ifa, 2344 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 2345 } 2346 } 2347 IF_ADDR_RUNLOCK(ifp); 2348 2349 /* 2350 * special cases, like 6to4, are handled in in6_ifattach 2351 */ 2352 in6_ifattach(ifp, NULL); 2353} 2354 2355int 2356in6if_do_dad(struct ifnet *ifp) 2357{ 2358 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 2359 return (0); 2360 2361 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) || 2362 (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD)) 2363 return (0); 2364 2365 switch (ifp->if_type) { 2366#ifdef IFT_DUMMY 2367 case IFT_DUMMY: 2368#endif 2369 case IFT_FAITH: 2370 /* 2371 * These interfaces do not have the IFF_LOOPBACK flag, 2372 * but loop packets back. We do not have to do DAD on such 2373 * interfaces. We should even omit it, because loop-backed 2374 * NS would confuse the DAD procedure. 2375 */ 2376 return (0); 2377 default: 2378 /* 2379 * Our DAD routine requires the interface up and running. 2380 * However, some interfaces can be up before the RUNNING 2381 * status. Additionaly, users may try to assign addresses 2382 * before the interface becomes up (or running). 2383 * This function returns EAGAIN in that case. 2384 * The caller should mark "tentative" on the address instead of 2385 * performing DAD immediately. 2386 */ 2387 if (!((ifp->if_flags & IFF_UP) && 2388 (ifp->if_drv_flags & IFF_DRV_RUNNING))) 2389 return (EAGAIN); 2390 2391 return (1); 2392 } 2393} 2394 2395/* 2396 * Calculate max IPv6 MTU through all the interfaces and store it 2397 * to in6_maxmtu. 2398 */ 2399void 2400in6_setmaxmtu(void) 2401{ 2402 unsigned long maxmtu = 0; 2403 struct ifnet *ifp; 2404 2405 IFNET_RLOCK_NOSLEEP(); 2406 TAILQ_FOREACH(ifp, &V_ifnet, if_list) { 2407 /* this function can be called during ifnet initialization */ 2408 if (!ifp->if_afdata[AF_INET6]) 2409 continue; 2410 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2411 IN6_LINKMTU(ifp) > maxmtu) 2412 maxmtu = IN6_LINKMTU(ifp); 2413 } 2414 IFNET_RUNLOCK_NOSLEEP(); 2415 if (maxmtu) /* update only when maxmtu is positive */ 2416 V_in6_maxmtu = maxmtu; 2417} 2418 2419/* 2420 * Provide the length of interface identifiers to be used for the link attached 2421 * to the given interface. The length should be defined in "IPv6 over 2422 * xxx-link" document. Note that address architecture might also define 2423 * the length for a particular set of address prefixes, regardless of the 2424 * link type. As clarified in rfc2462bis, those two definitions should be 2425 * consistent, and those really are as of August 2004. 2426 */ 2427int 2428in6_if2idlen(struct ifnet *ifp) 2429{ 2430 switch (ifp->if_type) { 2431 case IFT_ETHER: /* RFC2464 */ 2432#ifdef IFT_PROPVIRTUAL 2433 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2434#endif 2435#ifdef IFT_L2VLAN 2436 case IFT_L2VLAN: /* ditto */ 2437#endif 2438#ifdef IFT_IEEE80211 2439 case IFT_IEEE80211: /* ditto */ 2440#endif 2441#ifdef IFT_MIP 2442 case IFT_MIP: /* ditto */ 2443#endif 2444 case IFT_BRIDGE: /* bridge(4) only does Ethernet-like links */ 2445 case IFT_INFINIBAND: 2446 return (64); 2447 case IFT_FDDI: /* RFC2467 */ 2448 return (64); 2449 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 2450 return (64); 2451 case IFT_PPP: /* RFC2472 */ 2452 return (64); 2453 case IFT_ARCNET: /* RFC2497 */ 2454 return (64); 2455 case IFT_FRELAY: /* RFC2590 */ 2456 return (64); 2457 case IFT_IEEE1394: /* RFC3146 */ 2458 return (64); 2459 case IFT_GIF: 2460 return (64); /* draft-ietf-v6ops-mech-v2-07 */ 2461 case IFT_LOOP: 2462 return (64); /* XXX: is this really correct? */ 2463 default: 2464 /* 2465 * Unknown link type: 2466 * It might be controversial to use the today's common constant 2467 * of 64 for these cases unconditionally. For full compliance, 2468 * we should return an error in this case. On the other hand, 2469 * if we simply miss the standard for the link type or a new 2470 * standard is defined for a new link type, the IFID length 2471 * is very likely to be the common constant. As a compromise, 2472 * we always use the constant, but make an explicit notice 2473 * indicating the "unknown" case. 2474 */ 2475 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2476 return (64); 2477 } 2478} 2479 2480#include <sys/sysctl.h> 2481 2482struct in6_llentry { 2483 struct llentry base; 2484 struct sockaddr_in6 l3_addr6; 2485}; 2486 2487/* 2488 * Deletes an address from the address table. 2489 * This function is called by the timer functions 2490 * such as arptimer() and nd6_llinfo_timer(), and 2491 * the caller does the locking. 2492 */ 2493static void 2494in6_lltable_free(struct lltable *llt, struct llentry *lle) 2495{ 2496 LLE_WUNLOCK(lle); 2497 LLE_LOCK_DESTROY(lle); 2498 free(lle, M_LLTABLE); 2499} 2500 2501static struct llentry * 2502in6_lltable_new(const struct sockaddr *l3addr, u_int flags) 2503{ 2504 struct in6_llentry *lle; 2505 2506 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 2507 if (lle == NULL) /* NB: caller generates msg */ 2508 return NULL; 2509 2510 lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr; 2511 lle->base.lle_refcnt = 1; 2512 lle->base.lle_free = in6_lltable_free; 2513 LLE_LOCK_INIT(&lle->base); 2514 callout_init(&lle->base.ln_timer_ch, 1); 2515 2516 return (&lle->base); 2517} 2518 2519static void 2520in6_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix, 2521 const struct sockaddr *mask, u_int flags) 2522{ 2523 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix; 2524 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask; 2525 struct llentry *lle, *next; 2526 int i; 2527 2528 /* 2529 * (flags & LLE_STATIC) means deleting all entries 2530 * including static ND6 entries. 2531 */ 2532 IF_AFDATA_WLOCK(llt->llt_ifp); 2533 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 2534 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 2535 if (IN6_ARE_MASKED_ADDR_EQUAL( 2536 &satosin6(L3_ADDR(lle))->sin6_addr, 2537 &pfx->sin6_addr, &msk->sin6_addr) && 2538 ((flags & LLE_STATIC) || 2539 !(lle->la_flags & LLE_STATIC))) { 2540 LLE_WLOCK(lle); 2541 if (callout_stop(&lle->la_timer)) 2542 LLE_REMREF(lle); 2543 llentry_free(lle); 2544 } 2545 } 2546 } 2547 IF_AFDATA_WUNLOCK(llt->llt_ifp); 2548} 2549 2550static int 2551in6_lltable_rtcheck(struct ifnet *ifp, 2552 u_int flags, 2553 const struct sockaddr *l3addr) 2554{ 2555 struct rtentry *rt; 2556 char ip6buf[INET6_ADDRSTRLEN]; 2557 2558 KASSERT(l3addr->sa_family == AF_INET6, 2559 ("sin_family %d", l3addr->sa_family)); 2560 2561 /* Our local addresses are always only installed on the default FIB. */ 2562 /* XXX rtalloc1 should take a const param */ 2563 rt = in6_rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0, 2564 RT_DEFAULT_FIB); 2565 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 2566 struct ifaddr *ifa; 2567 /* 2568 * Create an ND6 cache for an IPv6 neighbor 2569 * that is not covered by our own prefix. 2570 */ 2571 /* XXX ifaof_ifpforaddr should take a const param */ 2572 ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp); 2573 if (ifa != NULL) { 2574 ifa_free(ifa); 2575 if (rt != NULL) 2576 RTFREE_LOCKED(rt); 2577 return 0; 2578 } 2579 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2580 ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr)); 2581 if (rt != NULL) 2582 RTFREE_LOCKED(rt); 2583 return EINVAL; 2584 } 2585 RTFREE_LOCKED(rt); 2586 return 0; 2587} 2588 2589static struct llentry * 2590in6_lltable_lookup(struct lltable *llt, u_int flags, 2591 const struct sockaddr *l3addr) 2592{ 2593 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2594 struct ifnet *ifp = llt->llt_ifp; 2595 struct llentry *lle; 2596 struct llentries *lleh; 2597 u_int hashkey; 2598 2599 IF_AFDATA_LOCK_ASSERT(ifp); 2600 KASSERT(l3addr->sa_family == AF_INET6, 2601 ("sin_family %d", l3addr->sa_family)); 2602 2603 hashkey = sin6->sin6_addr.s6_addr32[3]; 2604 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 2605 LIST_FOREACH(lle, lleh, lle_next) { 2606 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle); 2607 if (lle->la_flags & LLE_DELETED) 2608 continue; 2609 if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr, 2610 sizeof(struct in6_addr)) == 0) 2611 break; 2612 } 2613 2614 if (lle == NULL) { 2615 if (!(flags & LLE_CREATE)) 2616 return (NULL); 2617 IF_AFDATA_WLOCK_ASSERT(ifp); 2618 /* 2619 * A route that covers the given address must have 2620 * been installed 1st because we are doing a resolution, 2621 * verify this. 2622 */ 2623 if (!(flags & LLE_IFADDR) && 2624 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2625 return NULL; 2626 2627 lle = in6_lltable_new(l3addr, flags); 2628 if (lle == NULL) { 2629 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2630 return NULL; 2631 } 2632 lle->la_flags = flags & ~LLE_CREATE; 2633 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 2634 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 2635 lle->la_flags |= (LLE_VALID | LLE_STATIC); 2636 } 2637 2638 lle->lle_tbl = llt; 2639 lle->lle_head = lleh; 2640 lle->la_flags |= LLE_LINKED; 2641 LIST_INSERT_HEAD(lleh, lle, lle_next); 2642 } else if (flags & LLE_DELETE) { 2643 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 2644 LLE_WLOCK(lle); 2645 lle->la_flags |= LLE_DELETED; 2646 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 2647#ifdef DIAGNOSTIC 2648 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2649#endif 2650 if ((lle->la_flags & 2651 (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC) 2652 llentry_free(lle); 2653 else 2654 LLE_WUNLOCK(lle); 2655 } 2656 lle = (void *)-1; 2657 } 2658 if (LLE_IS_VALID(lle)) { 2659 if (flags & LLE_EXCLUSIVE) 2660 LLE_WLOCK(lle); 2661 else 2662 LLE_RLOCK(lle); 2663 } 2664 return (lle); 2665} 2666 2667static int 2668in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 2669{ 2670 struct ifnet *ifp = llt->llt_ifp; 2671 struct llentry *lle; 2672 /* XXX stack use */ 2673 struct { 2674 struct rt_msghdr rtm; 2675 struct sockaddr_in6 sin6; 2676 /* 2677 * ndp.c assumes that sdl is word aligned 2678 */ 2679#ifdef __LP64__ 2680 uint32_t pad; 2681#endif 2682 struct sockaddr_dl sdl; 2683 } ndpc; 2684 int i, error; 2685 2686 if (ifp->if_flags & IFF_LOOPBACK) 2687 return 0; 2688 2689 LLTABLE_LOCK_ASSERT(); 2690 2691 error = 0; 2692 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 2693 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 2694 struct sockaddr_dl *sdl; 2695 2696 /* skip deleted or invalid entries */ 2697 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID) 2698 continue; 2699 /* Skip if jailed and not a valid IP of the prison. */ 2700 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 2701 continue; 2702 /* 2703 * produce a msg made of: 2704 * struct rt_msghdr; 2705 * struct sockaddr_in6 (IPv6) 2706 * struct sockaddr_dl; 2707 */ 2708 bzero(&ndpc, sizeof(ndpc)); 2709 ndpc.rtm.rtm_msglen = sizeof(ndpc); 2710 ndpc.rtm.rtm_version = RTM_VERSION; 2711 ndpc.rtm.rtm_type = RTM_GET; 2712 ndpc.rtm.rtm_flags = RTF_UP; 2713 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 2714 ndpc.sin6.sin6_family = AF_INET6; 2715 ndpc.sin6.sin6_len = sizeof(ndpc.sin6); 2716 bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle)); 2717 if (V_deembed_scopeid) 2718 sa6_recoverscope(&ndpc.sin6); 2719 2720 /* publish */ 2721 if (lle->la_flags & LLE_PUB) 2722 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE; 2723 2724 sdl = &ndpc.sdl; 2725 sdl->sdl_family = AF_LINK; 2726 sdl->sdl_len = sizeof(*sdl); 2727 sdl->sdl_alen = ifp->if_addrlen; 2728 sdl->sdl_index = ifp->if_index; 2729 sdl->sdl_type = ifp->if_type; 2730 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 2731 ndpc.rtm.rtm_rmx.rmx_expire = 2732 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 2733 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 2734 if (lle->la_flags & LLE_STATIC) 2735 ndpc.rtm.rtm_flags |= RTF_STATIC; 2736 ndpc.rtm.rtm_index = ifp->if_index; 2737 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc)); 2738 if (error) 2739 break; 2740 } 2741 } 2742 return error; 2743} 2744 2745void * 2746in6_domifattach(struct ifnet *ifp) 2747{ 2748 struct in6_ifextra *ext; 2749 2750 /* There are not IPv6-capable interfaces. */ 2751 switch (ifp->if_type) { 2752 case IFT_PFLOG: 2753 case IFT_PFSYNC: 2754 case IFT_USB: 2755 return (NULL); 2756 } 2757 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2758 bzero(ext, sizeof(*ext)); 2759 2760 ext->in6_ifstat = malloc(sizeof(counter_u64_t) * 2761 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK); 2762 COUNTER_ARRAY_ALLOC(ext->in6_ifstat, 2763 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK); 2764 2765 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) * 2766 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR, 2767 M_WAITOK); 2768 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat, 2769 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK); 2770 2771 ext->nd_ifinfo = nd6_ifattach(ifp); 2772 ext->scope6_id = scope6_ifattach(ifp); 2773 ext->lltable = lltable_init(ifp, AF_INET6); 2774 if (ext->lltable != NULL) { 2775 ext->lltable->llt_prefix_free = in6_lltable_prefix_free; 2776 ext->lltable->llt_lookup = in6_lltable_lookup; 2777 ext->lltable->llt_dump = in6_lltable_dump; 2778 } 2779 2780 ext->mld_ifinfo = mld_domifattach(ifp); 2781 2782 return ext; 2783} 2784 2785void 2786in6_domifdetach(struct ifnet *ifp, void *aux) 2787{ 2788 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2789 2790 mld_domifdetach(ifp); 2791 scope6_ifdetach(ext->scope6_id); 2792 nd6_ifdetach(ext->nd_ifinfo); 2793 lltable_free(ext->lltable); 2794 COUNTER_ARRAY_FREE(ext->in6_ifstat, 2795 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 2796 free(ext->in6_ifstat, M_IFADDR); 2797 COUNTER_ARRAY_FREE(ext->icmp6_ifstat, 2798 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 2799 free(ext->icmp6_ifstat, M_IFADDR); 2800 free(ext, M_IFADDR); 2801} 2802 2803/* 2804 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2805 * v4 mapped addr or v4 compat addr 2806 */ 2807void 2808in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2809{ 2810 2811 bzero(sin, sizeof(*sin)); 2812 sin->sin_len = sizeof(struct sockaddr_in); 2813 sin->sin_family = AF_INET; 2814 sin->sin_port = sin6->sin6_port; 2815 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2816} 2817 2818/* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2819void 2820in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2821{ 2822 bzero(sin6, sizeof(*sin6)); 2823 sin6->sin6_len = sizeof(struct sockaddr_in6); 2824 sin6->sin6_family = AF_INET6; 2825 sin6->sin6_port = sin->sin_port; 2826 sin6->sin6_addr.s6_addr32[0] = 0; 2827 sin6->sin6_addr.s6_addr32[1] = 0; 2828 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2829 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2830} 2831 2832/* Convert sockaddr_in6 into sockaddr_in. */ 2833void 2834in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2835{ 2836 struct sockaddr_in *sin_p; 2837 struct sockaddr_in6 sin6; 2838 2839 /* 2840 * Save original sockaddr_in6 addr and convert it 2841 * to sockaddr_in. 2842 */ 2843 sin6 = *(struct sockaddr_in6 *)nam; 2844 sin_p = (struct sockaddr_in *)nam; 2845 in6_sin6_2_sin(sin_p, &sin6); 2846} 2847 2848/* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2849void 2850in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2851{ 2852 struct sockaddr_in *sin_p; 2853 struct sockaddr_in6 *sin6_p; 2854 2855 sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK); 2856 sin_p = (struct sockaddr_in *)*nam; 2857 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2858 free(*nam, M_SONAME); 2859 *nam = (struct sockaddr *)sin6_p; 2860} 2861