in6.c revision 282622
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 282622 2015-05-08 08:35:06Z hiren $"); 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 if (nd6_need_cache(ifp) == 0) 159 return; 160 IF_AFDATA_LOCK(ifp); 161 ifa->ifa_rtrequest = nd6_rtrequest; 162 ln = lla_lookup(LLTABLE6(ifp), (LLE_CREATE | LLE_IFADDR | 163 LLE_EXCLUSIVE), (struct sockaddr *)&ia->ia_addr); 164 IF_AFDATA_UNLOCK(ifp); 165 if (ln != NULL) { 166 ln->la_expire = 0; /* for IPv6 this means permanent */ 167 ln->ln_state = ND6_LLINFO_REACHABLE; 168 /* 169 * initialize for rtmsg generation 170 */ 171 bzero(&gateway, sizeof(gateway)); 172 gateway.sdl_len = sizeof(gateway); 173 gateway.sdl_family = AF_LINK; 174 gateway.sdl_nlen = 0; 175 gateway.sdl_alen = 6; 176 memcpy(gateway.sdl_data, &ln->ll_addr.mac_aligned, 177 sizeof(ln->ll_addr)); 178 LLE_WUNLOCK(ln); 179 } 180 181 bzero(&rt, sizeof(rt)); 182 rt.rt_gateway = (struct sockaddr *)&gateway; 183 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 184 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr)); 185 rt_mask(&rt) = (struct sockaddr *)&mask; 186 rt_key(&rt) = (struct sockaddr *)&addr; 187 rt.rt_flags = RTF_UP | RTF_HOST | RTF_STATIC; 188 /* Announce arrival of local address to all FIBs. */ 189 rt_newaddrmsg(RTM_ADD, ifa, 0, &rt); 190} 191 192void 193in6_ifremloop(struct ifaddr *ifa) 194{ 195 struct sockaddr_dl gateway; 196 struct sockaddr_in6 mask, addr; 197 struct rtentry rt0; 198 struct in6_ifaddr *ia; 199 struct ifnet *ifp; 200 201 ia = ifa2ia6(ifa); 202 ifp = ifa->ifa_ifp; 203 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr)); 204 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 205 lltable_prefix_free(AF_INET6, (struct sockaddr *)&addr, 206 (struct sockaddr *)&mask, LLE_STATIC); 207 208 /* 209 * initialize for rtmsg generation 210 */ 211 bzero(&gateway, sizeof(gateway)); 212 gateway.sdl_len = sizeof(gateway); 213 gateway.sdl_family = AF_LINK; 214 gateway.sdl_nlen = 0; 215 gateway.sdl_alen = ifp->if_addrlen; 216 bzero(&rt0, sizeof(rt0)); 217 rt0.rt_gateway = (struct sockaddr *)&gateway; 218 rt_mask(&rt0) = (struct sockaddr *)&mask; 219 rt_key(&rt0) = (struct sockaddr *)&addr; 220 rt0.rt_flags = RTF_HOST | RTF_STATIC; 221 /* Announce removal of local address to all FIBs. */ 222 rt_newaddrmsg(RTM_DELETE, ifa, 0, &rt0); 223} 224 225int 226in6_mask2len(struct in6_addr *mask, u_char *lim0) 227{ 228 int x = 0, y; 229 u_char *lim = lim0, *p; 230 231 /* ignore the scope_id part */ 232 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 233 lim = (u_char *)mask + sizeof(*mask); 234 for (p = (u_char *)mask; p < lim; x++, p++) { 235 if (*p != 0xff) 236 break; 237 } 238 y = 0; 239 if (p < lim) { 240 for (y = 0; y < 8; y++) { 241 if ((*p & (0x80 >> y)) == 0) 242 break; 243 } 244 } 245 246 /* 247 * when the limit pointer is given, do a stricter check on the 248 * remaining bits. 249 */ 250 if (p < lim) { 251 if (y != 0 && (*p & (0x00ff >> y)) != 0) 252 return (-1); 253 for (p = p + 1; p < lim; p++) 254 if (*p != 0) 255 return (-1); 256 } 257 258 return x * 8 + y; 259} 260 261#ifdef COMPAT_FREEBSD32 262struct in6_ndifreq32 { 263 char ifname[IFNAMSIZ]; 264 uint32_t ifindex; 265}; 266#define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32) 267#endif 268 269int 270in6_control(struct socket *so, u_long cmd, caddr_t data, 271 struct ifnet *ifp, struct thread *td) 272{ 273 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 274 struct in6_ifaddr *ia = NULL; 275 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 276 struct sockaddr_in6 *sa6; 277 int carp_attached = 0; 278 int error; 279 u_long ocmd = cmd; 280 281 /* 282 * Compat to make pre-10.x ifconfig(8) operable. 283 */ 284 if (cmd == OSIOCAIFADDR_IN6) 285 cmd = SIOCAIFADDR_IN6; 286 287 switch (cmd) { 288 case SIOCGETSGCNT_IN6: 289 case SIOCGETMIFCNT_IN6: 290 /* 291 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c. 292 * We cannot see how that would be needed, so do not adjust the 293 * KPI blindly; more likely should clean up the IPv4 variant. 294 */ 295 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP); 296 } 297 298 switch (cmd) { 299 case SIOCAADDRCTL_POLICY: 300 case SIOCDADDRCTL_POLICY: 301 if (td != NULL) { 302 error = priv_check(td, PRIV_NETINET_ADDRCTRL6); 303 if (error) 304 return (error); 305 } 306 return (in6_src_ioctl(cmd, data)); 307 } 308 309 if (ifp == NULL) 310 return (EOPNOTSUPP); 311 312 switch (cmd) { 313 case SIOCSNDFLUSH_IN6: 314 case SIOCSPFXFLUSH_IN6: 315 case SIOCSRTRFLUSH_IN6: 316 case SIOCSDEFIFACE_IN6: 317 case SIOCSIFINFO_FLAGS: 318 case SIOCSIFINFO_IN6: 319 if (td != NULL) { 320 error = priv_check(td, PRIV_NETINET_ND6); 321 if (error) 322 return (error); 323 } 324 /* FALLTHROUGH */ 325 case OSIOCGIFINFO_IN6: 326 case SIOCGIFINFO_IN6: 327 case SIOCGDRLST_IN6: 328 case SIOCGPRLST_IN6: 329 case SIOCGNBRINFO_IN6: 330 case SIOCGDEFIFACE_IN6: 331 return (nd6_ioctl(cmd, data, ifp)); 332 333#ifdef COMPAT_FREEBSD32 334 case SIOCGDEFIFACE32_IN6: 335 { 336 struct in6_ndifreq ndif; 337 struct in6_ndifreq32 *ndif32; 338 339 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif, 340 ifp); 341 if (error) 342 return (error); 343 ndif32 = (struct in6_ndifreq32 *)data; 344 ndif32->ifindex = ndif.ifindex; 345 return (0); 346 } 347#endif 348 } 349 350 switch (cmd) { 351 case SIOCSIFPREFIX_IN6: 352 case SIOCDIFPREFIX_IN6: 353 case SIOCAIFPREFIX_IN6: 354 case SIOCCIFPREFIX_IN6: 355 case SIOCSGIFPREFIX_IN6: 356 case SIOCGIFPREFIX_IN6: 357 log(LOG_NOTICE, 358 "prefix ioctls are now invalidated. " 359 "please use ifconfig.\n"); 360 return (EOPNOTSUPP); 361 } 362 363 switch (cmd) { 364 case SIOCSSCOPE6: 365 if (td != NULL) { 366 error = priv_check(td, PRIV_NETINET_SCOPE6); 367 if (error) 368 return (error); 369 } 370 /* FALLTHROUGH */ 371 case SIOCGSCOPE6: 372 case SIOCGSCOPE6DEF: 373 return (scope6_ioctl(cmd, data, ifp)); 374 } 375 376 switch (cmd) { 377 case SIOCALIFADDR: 378 if (td != NULL) { 379 error = priv_check(td, PRIV_NET_ADDIFADDR); 380 if (error) 381 return (error); 382 } 383 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 384 385 case SIOCDLIFADDR: 386 if (td != NULL) { 387 error = priv_check(td, PRIV_NET_DELIFADDR); 388 if (error) 389 return (error); 390 } 391 /* FALLTHROUGH */ 392 case SIOCGLIFADDR: 393 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 394 } 395 396 /* 397 * Find address for this interface, if it exists. 398 * 399 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 400 * only, and used the first interface address as the target of other 401 * operations (without checking ifra_addr). This was because netinet 402 * code/API assumed at most 1 interface address per interface. 403 * Since IPv6 allows a node to assign multiple addresses 404 * on a single interface, we almost always look and check the 405 * presence of ifra_addr, and reject invalid ones here. 406 * It also decreases duplicated code among SIOC*_IN6 operations. 407 */ 408 switch (cmd) { 409 case SIOCAIFADDR_IN6: 410 case SIOCSIFPHYADDR_IN6: 411 sa6 = &ifra->ifra_addr; 412 break; 413 case SIOCSIFADDR_IN6: 414 case SIOCGIFADDR_IN6: 415 case SIOCSIFDSTADDR_IN6: 416 case SIOCSIFNETMASK_IN6: 417 case SIOCGIFDSTADDR_IN6: 418 case SIOCGIFNETMASK_IN6: 419 case SIOCDIFADDR_IN6: 420 case SIOCGIFPSRCADDR_IN6: 421 case SIOCGIFPDSTADDR_IN6: 422 case SIOCGIFAFLAG_IN6: 423 case SIOCSNDFLUSH_IN6: 424 case SIOCSPFXFLUSH_IN6: 425 case SIOCSRTRFLUSH_IN6: 426 case SIOCGIFALIFETIME_IN6: 427 case SIOCSIFALIFETIME_IN6: 428 case SIOCGIFSTAT_IN6: 429 case SIOCGIFSTAT_ICMP6: 430 sa6 = &ifr->ifr_addr; 431 break; 432 case SIOCSIFADDR: 433 case SIOCSIFBRDADDR: 434 case SIOCSIFDSTADDR: 435 case SIOCSIFNETMASK: 436 /* 437 * Although we should pass any non-INET6 ioctl requests 438 * down to driver, we filter some legacy INET requests. 439 * Drivers trust SIOCSIFADDR et al to come from an already 440 * privileged layer, and do not perform any credentials 441 * checks or input validation. 442 */ 443 return (EINVAL); 444 default: 445 sa6 = NULL; 446 break; 447 } 448 if (sa6 && sa6->sin6_family == AF_INET6) { 449 if (sa6->sin6_scope_id != 0) 450 error = sa6_embedscope(sa6, 0); 451 else 452 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 453 if (error != 0) 454 return (error); 455 if (td != NULL && (error = prison_check_ip6(td->td_ucred, 456 &sa6->sin6_addr)) != 0) 457 return (error); 458 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 459 } else 460 ia = NULL; 461 462 switch (cmd) { 463 case SIOCSIFADDR_IN6: 464 case SIOCSIFDSTADDR_IN6: 465 case SIOCSIFNETMASK_IN6: 466 /* 467 * Since IPv6 allows a node to assign multiple addresses 468 * on a single interface, SIOCSIFxxx ioctls are deprecated. 469 */ 470 /* we decided to obsolete this command (20000704) */ 471 error = EINVAL; 472 goto out; 473 474 case SIOCDIFADDR_IN6: 475 /* 476 * for IPv4, we look for existing in_ifaddr here to allow 477 * "ifconfig if0 delete" to remove the first IPv4 address on 478 * the interface. For IPv6, as the spec allows multiple 479 * interface address from the day one, we consider "remove the 480 * first one" semantics to be not preferable. 481 */ 482 if (ia == NULL) { 483 error = EADDRNOTAVAIL; 484 goto out; 485 } 486 /* FALLTHROUGH */ 487 case SIOCAIFADDR_IN6: 488 /* 489 * We always require users to specify a valid IPv6 address for 490 * the corresponding operation. 491 */ 492 if (ifra->ifra_addr.sin6_family != AF_INET6 || 493 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 494 error = EAFNOSUPPORT; 495 goto out; 496 } 497 498 if (td != NULL) { 499 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 500 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR); 501 if (error) 502 goto out; 503 } 504 /* FALLTHROUGH */ 505 case SIOCGIFSTAT_IN6: 506 case SIOCGIFSTAT_ICMP6: 507 if (ifp->if_afdata[AF_INET6] == NULL) { 508 error = EPFNOSUPPORT; 509 goto out; 510 } 511 break; 512 513 case SIOCGIFADDR_IN6: 514 /* This interface is basically deprecated. use SIOCGIFCONF. */ 515 /* FALLTHROUGH */ 516 case SIOCGIFAFLAG_IN6: 517 case SIOCGIFNETMASK_IN6: 518 case SIOCGIFDSTADDR_IN6: 519 case SIOCGIFALIFETIME_IN6: 520 /* must think again about its semantics */ 521 if (ia == NULL) { 522 error = EADDRNOTAVAIL; 523 goto out; 524 } 525 break; 526 527 case SIOCSIFALIFETIME_IN6: 528 { 529 struct in6_addrlifetime *lt; 530 531 if (td != NULL) { 532 error = priv_check(td, PRIV_NETINET_ALIFETIME6); 533 if (error) 534 goto out; 535 } 536 if (ia == NULL) { 537 error = EADDRNOTAVAIL; 538 goto out; 539 } 540 /* sanity for overflow - beware unsigned */ 541 lt = &ifr->ifr_ifru.ifru_lifetime; 542 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME && 543 lt->ia6t_vltime + time_uptime < time_uptime) { 544 error = EINVAL; 545 goto out; 546 } 547 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME && 548 lt->ia6t_pltime + time_uptime < time_uptime) { 549 error = EINVAL; 550 goto out; 551 } 552 break; 553 } 554 } 555 556 switch (cmd) { 557 case SIOCGIFADDR_IN6: 558 ifr->ifr_addr = ia->ia_addr; 559 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 560 goto out; 561 break; 562 563 case SIOCGIFDSTADDR_IN6: 564 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 565 error = EINVAL; 566 goto out; 567 } 568 /* 569 * XXX: should we check if ifa_dstaddr is NULL and return 570 * an error? 571 */ 572 ifr->ifr_dstaddr = ia->ia_dstaddr; 573 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 574 goto out; 575 break; 576 577 case SIOCGIFNETMASK_IN6: 578 ifr->ifr_addr = ia->ia_prefixmask; 579 break; 580 581 case SIOCGIFAFLAG_IN6: 582 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 583 break; 584 585 case SIOCGIFSTAT_IN6: 586 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 587 ifp->if_afdata[AF_INET6])->in6_ifstat, 588 &ifr->ifr_ifru.ifru_stat, 589 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 590 break; 591 592 case SIOCGIFSTAT_ICMP6: 593 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 594 ifp->if_afdata[AF_INET6])->icmp6_ifstat, 595 &ifr->ifr_ifru.ifru_icmp6stat, 596 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 597 break; 598 599 case SIOCGIFALIFETIME_IN6: 600 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 601 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 602 time_t maxexpire; 603 struct in6_addrlifetime *retlt = 604 &ifr->ifr_ifru.ifru_lifetime; 605 606 /* 607 * XXX: adjust expiration time assuming time_t is 608 * signed. 609 */ 610 maxexpire = (-1) & 611 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 612 if (ia->ia6_lifetime.ia6t_vltime < 613 maxexpire - ia->ia6_updatetime) { 614 retlt->ia6t_expire = ia->ia6_updatetime + 615 ia->ia6_lifetime.ia6t_vltime; 616 } else 617 retlt->ia6t_expire = maxexpire; 618 } 619 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 620 time_t maxexpire; 621 struct in6_addrlifetime *retlt = 622 &ifr->ifr_ifru.ifru_lifetime; 623 624 /* 625 * XXX: adjust expiration time assuming time_t is 626 * signed. 627 */ 628 maxexpire = (-1) & 629 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 630 if (ia->ia6_lifetime.ia6t_pltime < 631 maxexpire - ia->ia6_updatetime) { 632 retlt->ia6t_preferred = ia->ia6_updatetime + 633 ia->ia6_lifetime.ia6t_pltime; 634 } else 635 retlt->ia6t_preferred = maxexpire; 636 } 637 break; 638 639 case SIOCSIFALIFETIME_IN6: 640 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; 641 /* for sanity */ 642 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 643 ia->ia6_lifetime.ia6t_expire = 644 time_uptime + ia->ia6_lifetime.ia6t_vltime; 645 } else 646 ia->ia6_lifetime.ia6t_expire = 0; 647 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 648 ia->ia6_lifetime.ia6t_preferred = 649 time_uptime + ia->ia6_lifetime.ia6t_pltime; 650 } else 651 ia->ia6_lifetime.ia6t_preferred = 0; 652 break; 653 654 case SIOCAIFADDR_IN6: 655 { 656 int i; 657 struct nd_prefixctl pr0; 658 struct nd_prefix *pr; 659 660 /* 661 * first, make or update the interface address structure, 662 * and link it to the list. 663 */ 664 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 665 goto out; 666 if (ia != NULL) 667 ifa_free(&ia->ia_ifa); 668 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 669 == NULL) { 670 /* 671 * this can happen when the user specify the 0 valid 672 * lifetime. 673 */ 674 break; 675 } 676 677 if (cmd == ocmd && ifra->ifra_vhid > 0) { 678 if (carp_attach_p != NULL) 679 error = (*carp_attach_p)(&ia->ia_ifa, 680 ifra->ifra_vhid); 681 else 682 error = EPROTONOSUPPORT; 683 if (error) 684 goto out; 685 else 686 carp_attached = 1; 687 } 688 689 /* 690 * then, make the prefix on-link on the interface. 691 * XXX: we'd rather create the prefix before the address, but 692 * we need at least one address to install the corresponding 693 * interface route, so we configure the address first. 694 */ 695 696 /* 697 * convert mask to prefix length (prefixmask has already 698 * been validated in in6_update_ifa(). 699 */ 700 bzero(&pr0, sizeof(pr0)); 701 pr0.ndpr_ifp = ifp; 702 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 703 NULL); 704 if (pr0.ndpr_plen == 128) { 705 break; /* we don't need to install a host route. */ 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(); 773 if (error == 0 && ia) { 774 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) { 775 /* 776 * Try to clear the flag when a new 777 * IPv6 address is added onto an 778 * IFDISABLED interface and it 779 * succeeds. 780 */ 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, 787 (caddr_t)&nd, ifp) < 0) 788 log(LOG_NOTICE, "SIOCAIFADDR_IN6: " 789 "SIOCSIFINFO_FLAGS for -ifdisabled " 790 "failed."); 791 /* 792 * Ignore failure of clearing the flag 793 * intentionally. The failure means 794 * address duplication was detected. 795 */ 796 } 797 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 798 } 799 break; 800 } 801 802 case SIOCDIFADDR_IN6: 803 { 804 struct nd_prefix *pr; 805 806 /* 807 * If the address being deleted is the only one that owns 808 * the corresponding prefix, expire the prefix as well. 809 * XXX: theoretically, we don't have to worry about such 810 * relationship, since we separate the address management 811 * and the prefix management. We do this, however, to provide 812 * as much backward compatibility as possible in terms of 813 * the ioctl operation. 814 * Note that in6_purgeaddr() will decrement ndpr_refcnt. 815 */ 816 pr = ia->ia6_ndpr; 817 in6_purgeaddr(&ia->ia_ifa); 818 if (pr && pr->ndpr_refcnt == 0) 819 prelist_remove(pr); 820 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 821 break; 822 } 823 824 default: 825 if (ifp->if_ioctl == NULL) { 826 error = EOPNOTSUPP; 827 goto out; 828 } 829 error = (*ifp->if_ioctl)(ifp, cmd, data); 830 goto out; 831 } 832 833 error = 0; 834out: 835 if (ia != NULL) 836 ifa_free(&ia->ia_ifa); 837 return (error); 838} 839 840 841/* 842 * Join necessary multicast groups. Factored out from in6_update_ifa(). 843 * This entire work should only be done once, for the default FIB. 844 */ 845static int 846in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra, 847 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol) 848{ 849 char ip6buf[INET6_ADDRSTRLEN]; 850 struct sockaddr_in6 mltaddr, mltmask; 851 struct in6_addr llsol; 852 struct in6_multi_mship *imm; 853 struct rtentry *rt; 854 int delay, error; 855 856 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__)); 857 858 /* Join solicited multicast addr for new host id. */ 859 bzero(&llsol, sizeof(struct in6_addr)); 860 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL; 861 llsol.s6_addr32[1] = 0; 862 llsol.s6_addr32[2] = htonl(1); 863 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 864 llsol.s6_addr8[12] = 0xff; 865 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) { 866 /* XXX: should not happen */ 867 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 868 goto cleanup; 869 } 870 delay = 0; 871 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 872 /* 873 * We need a random delay for DAD on the address being 874 * configured. It also means delaying transmission of the 875 * corresponding MLD report to avoid report collision. 876 * [RFC 4861, Section 6.3.7] 877 */ 878 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 879 } 880 imm = in6_joingroup(ifp, &llsol, &error, delay); 881 if (imm == NULL) { 882 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 883 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &llsol), 884 if_name(ifp), error)); 885 goto cleanup; 886 } 887 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 888 *in6m_sol = imm->i6mm_maddr; 889 890 bzero(&mltmask, sizeof(mltmask)); 891 mltmask.sin6_len = sizeof(struct sockaddr_in6); 892 mltmask.sin6_family = AF_INET6; 893 mltmask.sin6_addr = in6mask32; 894#define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */ 895 896 /* 897 * Join link-local all-nodes address. 898 */ 899 bzero(&mltaddr, sizeof(mltaddr)); 900 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 901 mltaddr.sin6_family = AF_INET6; 902 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 903 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 904 goto cleanup; /* XXX: should not fail */ 905 906 /* 907 * XXX: do we really need this automatic routes? We should probably 908 * reconsider this stuff. Most applications actually do not need the 909 * routes, since they usually specify the outgoing interface. 910 */ 911 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 912 if (rt != NULL) { 913 /* XXX: only works in !SCOPEDROUTING case. */ 914 if (memcmp(&mltaddr.sin6_addr, 915 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, 916 MLTMASK_LEN)) { 917 RTFREE_LOCKED(rt); 918 rt = NULL; 919 } 920 } 921 if (rt == NULL) { 922 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr, 923 (struct sockaddr *)&ia->ia_addr, 924 (struct sockaddr *)&mltmask, RTF_UP, 925 (struct rtentry **)0, RT_DEFAULT_FIB); 926 if (error) 927 goto cleanup; 928 } else 929 RTFREE_LOCKED(rt); 930 931 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 932 if (imm == NULL) { 933 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 934 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 935 &mltaddr.sin6_addr), if_name(ifp), error)); 936 goto cleanup; 937 } 938 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 939 940 /* 941 * Join node information group address. 942 */ 943 delay = 0; 944 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 945 /* 946 * The spec does not say anything about delay for this group, 947 * but the same logic should apply. 948 */ 949 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 950 } 951 if (in6_nigroup(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) { 952 /* XXX jinmei */ 953 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay); 954 if (imm == NULL) 955 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 956 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 957 &mltaddr.sin6_addr), if_name(ifp), error)); 958 /* XXX not very fatal, go on... */ 959 else 960 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 961 } 962 if (V_icmp6_nodeinfo_oldmcprefix && 963 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) { 964 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay); 965 if (imm == NULL) 966 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 967 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 968 &mltaddr.sin6_addr), if_name(ifp), error)); 969 /* XXX not very fatal, go on... */ 970 else 971 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 972 } 973 974 /* 975 * Join interface-local all-nodes address. 976 * (ff01::1%ifN, and ff01::%ifN/32) 977 */ 978 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 979 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 980 goto cleanup; /* XXX: should not fail */ 981 /* XXX: again, do we really need the route? */ 982 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 983 if (rt != NULL) { 984 if (memcmp(&mltaddr.sin6_addr, 985 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, 986 MLTMASK_LEN)) { 987 RTFREE_LOCKED(rt); 988 rt = NULL; 989 } 990 } 991 if (rt == NULL) { 992 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr, 993 (struct sockaddr *)&ia->ia_addr, 994 (struct sockaddr *)&mltmask, RTF_UP, 995 (struct rtentry **)0, RT_DEFAULT_FIB); 996 if (error) 997 goto cleanup; 998 } else 999 RTFREE_LOCKED(rt); 1000 1001 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1002 if (imm == NULL) { 1003 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 1004 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 1005 &mltaddr.sin6_addr), if_name(ifp), error)); 1006 goto cleanup; 1007 } 1008 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1009#undef MLTMASK_LEN 1010 1011cleanup: 1012 return (error); 1013} 1014 1015/* 1016 * Update parameters of an IPv6 interface address. 1017 * If necessary, a new entry is created and linked into address chains. 1018 * This function is separated from in6_control(). 1019 */ 1020int 1021in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1022 struct in6_ifaddr *ia, int flags) 1023{ 1024 int error = 0, hostIsNew = 0, plen = -1; 1025 struct sockaddr_in6 dst6; 1026 struct in6_addrlifetime *lt; 1027 struct in6_multi *in6m_sol; 1028 int delay; 1029 char ip6buf[INET6_ADDRSTRLEN]; 1030 1031 /* Validate parameters */ 1032 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 1033 return (EINVAL); 1034 1035 /* 1036 * The destination address for a p2p link must have a family 1037 * of AF_UNSPEC or AF_INET6. 1038 */ 1039 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 1040 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 1041 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 1042 return (EAFNOSUPPORT); 1043 /* 1044 * validate ifra_prefixmask. don't check sin6_family, netmask 1045 * does not carry fields other than sin6_len. 1046 */ 1047 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 1048 return (EINVAL); 1049 /* 1050 * Because the IPv6 address architecture is classless, we require 1051 * users to specify a (non 0) prefix length (mask) for a new address. 1052 * We also require the prefix (when specified) mask is valid, and thus 1053 * reject a non-consecutive mask. 1054 */ 1055 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 1056 return (EINVAL); 1057 if (ifra->ifra_prefixmask.sin6_len != 0) { 1058 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 1059 (u_char *)&ifra->ifra_prefixmask + 1060 ifra->ifra_prefixmask.sin6_len); 1061 if (plen <= 0) 1062 return (EINVAL); 1063 } else { 1064 /* 1065 * In this case, ia must not be NULL. We just use its prefix 1066 * length. 1067 */ 1068 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1069 } 1070 /* 1071 * If the destination address on a p2p interface is specified, 1072 * and the address is a scoped one, validate/set the scope 1073 * zone identifier. 1074 */ 1075 dst6 = ifra->ifra_dstaddr; 1076 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 1077 (dst6.sin6_family == AF_INET6)) { 1078 struct in6_addr in6_tmp; 1079 u_int32_t zoneid; 1080 1081 in6_tmp = dst6.sin6_addr; 1082 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 1083 return (EINVAL); /* XXX: should be impossible */ 1084 1085 if (dst6.sin6_scope_id != 0) { 1086 if (dst6.sin6_scope_id != zoneid) 1087 return (EINVAL); 1088 } else /* user omit to specify the ID. */ 1089 dst6.sin6_scope_id = zoneid; 1090 1091 /* convert into the internal form */ 1092 if (sa6_embedscope(&dst6, 0)) 1093 return (EINVAL); /* XXX: should be impossible */ 1094 } 1095 /* 1096 * The destination address can be specified only for a p2p or a 1097 * loopback interface. If specified, the corresponding prefix length 1098 * must be 128. 1099 */ 1100 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 1101 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 1102 /* XXX: noisy message */ 1103 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 1104 "be specified for a p2p or a loopback IF only\n")); 1105 return (EINVAL); 1106 } 1107 if (plen != 128) { 1108 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 1109 "be 128 when dstaddr is specified\n")); 1110 return (EINVAL); 1111 } 1112 } 1113 /* lifetime consistency check */ 1114 lt = &ifra->ifra_lifetime; 1115 if (lt->ia6t_pltime > lt->ia6t_vltime) 1116 return (EINVAL); 1117 if (lt->ia6t_vltime == 0) { 1118 /* 1119 * the following log might be noisy, but this is a typical 1120 * configuration mistake or a tool's bug. 1121 */ 1122 nd6log((LOG_INFO, 1123 "in6_update_ifa: valid lifetime is 0 for %s\n", 1124 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr))); 1125 1126 if (ia == NULL) 1127 return (0); /* there's nothing to do */ 1128 } 1129 1130 /* 1131 * If this is a new address, allocate a new ifaddr and link it 1132 * into chains. 1133 */ 1134 if (ia == NULL) { 1135 hostIsNew = 1; 1136 /* 1137 * When in6_update_ifa() is called in a process of a received 1138 * RA, it is called under an interrupt context. So, we should 1139 * call malloc with M_NOWAIT. 1140 */ 1141 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR, 1142 M_NOWAIT); 1143 if (ia == NULL) 1144 return (ENOBUFS); 1145 bzero((caddr_t)ia, sizeof(*ia)); 1146 ifa_init(&ia->ia_ifa); 1147 LIST_INIT(&ia->ia6_memberships); 1148 /* Initialize the address and masks, and put time stamp */ 1149 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1150 ia->ia_addr.sin6_family = AF_INET6; 1151 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 1152 ia->ia6_createtime = time_uptime; 1153 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1154 /* 1155 * XXX: some functions expect that ifa_dstaddr is not 1156 * NULL for p2p interfaces. 1157 */ 1158 ia->ia_ifa.ifa_dstaddr = 1159 (struct sockaddr *)&ia->ia_dstaddr; 1160 } else { 1161 ia->ia_ifa.ifa_dstaddr = NULL; 1162 } 1163 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 1164 ia->ia_ifp = ifp; 1165 ifa_ref(&ia->ia_ifa); /* if_addrhead */ 1166 IF_ADDR_WLOCK(ifp); 1167 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1168 IF_ADDR_WUNLOCK(ifp); 1169 1170 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */ 1171 IN6_IFADDR_WLOCK(); 1172 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link); 1173 LIST_INSERT_HEAD(IN6ADDR_HASH(&ifra->ifra_addr.sin6_addr), 1174 ia, ia6_hash); 1175 IN6_IFADDR_WUNLOCK(); 1176 } 1177 1178 /* update timestamp */ 1179 ia->ia6_updatetime = time_uptime; 1180 1181 /* set prefix mask */ 1182 if (ifra->ifra_prefixmask.sin6_len) { 1183 /* 1184 * We prohibit changing the prefix length of an existing 1185 * address, because 1186 * + such an operation should be rare in IPv6, and 1187 * + the operation would confuse prefix management. 1188 */ 1189 if (ia->ia_prefixmask.sin6_len && 1190 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 1191 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an" 1192 " existing (%s) address should not be changed\n", 1193 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1194 error = EINVAL; 1195 goto unlink; 1196 } 1197 ia->ia_prefixmask = ifra->ifra_prefixmask; 1198 ia->ia_prefixmask.sin6_family = AF_INET6; 1199 } 1200 1201 /* 1202 * If a new destination address is specified, scrub the old one and 1203 * install the new destination. Note that the interface must be 1204 * p2p or loopback (see the check above.) 1205 */ 1206 if (dst6.sin6_family == AF_INET6 && 1207 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1208 int e; 1209 1210 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1211 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) { 1212 nd6log((LOG_ERR, "in6_update_ifa: failed to remove " 1213 "a route to the old destination: %s\n", 1214 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1215 /* proceed anyway... */ 1216 } else 1217 ia->ia_flags &= ~IFA_ROUTE; 1218 ia->ia_dstaddr = dst6; 1219 } 1220 1221 /* 1222 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1223 * to see if the address is deprecated or invalidated, but initialize 1224 * these members for applications. 1225 */ 1226 ia->ia6_lifetime = ifra->ifra_lifetime; 1227 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1228 ia->ia6_lifetime.ia6t_expire = 1229 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1230 } else 1231 ia->ia6_lifetime.ia6t_expire = 0; 1232 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1233 ia->ia6_lifetime.ia6t_preferred = 1234 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1235 } else 1236 ia->ia6_lifetime.ia6t_preferred = 0; 1237 1238 /* reset the interface and routing table appropriately. */ 1239 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 1240 goto unlink; 1241 1242 /* 1243 * configure address flags. 1244 */ 1245 ia->ia6_flags = ifra->ifra_flags; 1246 /* 1247 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1248 * userland, make it deprecated. 1249 */ 1250 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1251 ia->ia6_lifetime.ia6t_pltime = 0; 1252 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1253 } 1254 /* 1255 * Make the address tentative before joining multicast addresses, 1256 * so that corresponding MLD responses would not have a tentative 1257 * source address. 1258 */ 1259 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1260 if (hostIsNew && in6if_do_dad(ifp)) 1261 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1262 1263 /* DAD should be performed after ND6_IFF_IFDISABLED is cleared. */ 1264 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1265 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1266 1267 /* 1268 * We are done if we have simply modified an existing address. 1269 */ 1270 if (!hostIsNew) 1271 return (error); 1272 1273 /* 1274 * Beyond this point, we should call in6_purgeaddr upon an error, 1275 * not just go to unlink. 1276 */ 1277 1278 /* Join necessary multicast groups. */ 1279 in6m_sol = NULL; 1280 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1281 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol); 1282 if (error) 1283 goto cleanup; 1284 } 1285 1286 /* 1287 * Perform DAD, if needed. 1288 * XXX It may be of use, if we can administratively disable DAD. 1289 */ 1290 if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && 1291 (ia->ia6_flags & IN6_IFF_TENTATIVE)) 1292 { 1293 int mindelay, maxdelay; 1294 1295 delay = 0; 1296 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1297 /* 1298 * We need to impose a delay before sending an NS 1299 * for DAD. Check if we also needed a delay for the 1300 * corresponding MLD message. If we did, the delay 1301 * should be larger than the MLD delay (this could be 1302 * relaxed a bit, but this simple logic is at least 1303 * safe). 1304 * XXX: Break data hiding guidelines and look at 1305 * state for the solicited multicast group. 1306 */ 1307 mindelay = 0; 1308 if (in6m_sol != NULL && 1309 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) { 1310 mindelay = in6m_sol->in6m_timer; 1311 } 1312 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1313 if (maxdelay - mindelay == 0) 1314 delay = 0; 1315 else { 1316 delay = 1317 (arc4random() % (maxdelay - mindelay)) + 1318 mindelay; 1319 } 1320 } 1321 nd6_dad_start((struct ifaddr *)ia, delay); 1322 } 1323 1324 KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew")); 1325 ifa_free(&ia->ia_ifa); 1326 return (error); 1327 1328 unlink: 1329 /* 1330 * XXX: if a change of an existing address failed, keep the entry 1331 * anyway. 1332 */ 1333 if (hostIsNew) { 1334 in6_unlink_ifa(ia, ifp); 1335 ifa_free(&ia->ia_ifa); 1336 } 1337 return (error); 1338 1339 cleanup: 1340 KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew")); 1341 ifa_free(&ia->ia_ifa); 1342 in6_purgeaddr(&ia->ia_ifa); 1343 return error; 1344} 1345 1346/* 1347 * Leave multicast groups. Factored out from in6_purgeaddr(). 1348 * This entire work should only be done once, for the default FIB. 1349 */ 1350static int 1351in6_purgeaddr_mc(struct ifnet *ifp, struct in6_ifaddr *ia, struct ifaddr *ifa0) 1352{ 1353 struct sockaddr_in6 mltaddr, mltmask; 1354 struct in6_multi_mship *imm; 1355 struct rtentry *rt; 1356 struct sockaddr_in6 sin6; 1357 int error; 1358 1359 /* 1360 * Leave from multicast groups we have joined for the interface. 1361 */ 1362 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1363 LIST_REMOVE(imm, i6mm_chain); 1364 in6_leavegroup(imm); 1365 } 1366 1367 /* 1368 * Remove the link-local all-nodes address. 1369 */ 1370 bzero(&mltmask, sizeof(mltmask)); 1371 mltmask.sin6_len = sizeof(struct sockaddr_in6); 1372 mltmask.sin6_family = AF_INET6; 1373 mltmask.sin6_addr = in6mask32; 1374 1375 bzero(&mltaddr, sizeof(mltaddr)); 1376 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 1377 mltaddr.sin6_family = AF_INET6; 1378 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 1379 1380 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1381 return (error); 1382 1383 /* 1384 * As for the mltaddr above, proactively prepare the sin6 to avoid 1385 * rtentry un- and re-locking. 1386 */ 1387 if (ifa0 != NULL) { 1388 bzero(&sin6, sizeof(sin6)); 1389 sin6.sin6_len = sizeof(sin6); 1390 sin6.sin6_family = AF_INET6; 1391 memcpy(&sin6.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, 1392 sizeof(sin6.sin6_addr)); 1393 error = in6_setscope(&sin6.sin6_addr, ifa0->ifa_ifp, NULL); 1394 if (error != 0) 1395 return (error); 1396 } 1397 1398 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 1399 if (rt != NULL && rt->rt_gateway != NULL && 1400 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 1401 &ia->ia_addr.sin6_addr, 1402 sizeof(ia->ia_addr.sin6_addr)) == 0)) { 1403 /* 1404 * If no more IPv6 address exists on this interface then 1405 * remove the multicast address route. 1406 */ 1407 if (ifa0 == NULL) { 1408 memcpy(&mltaddr.sin6_addr, 1409 &satosin6(rt_key(rt))->sin6_addr, 1410 sizeof(mltaddr.sin6_addr)); 1411 RTFREE_LOCKED(rt); 1412 error = in6_rtrequest(RTM_DELETE, 1413 (struct sockaddr *)&mltaddr, 1414 (struct sockaddr *)&ia->ia_addr, 1415 (struct sockaddr *)&mltmask, RTF_UP, 1416 (struct rtentry **)0, RT_DEFAULT_FIB); 1417 if (error) 1418 log(LOG_INFO, "%s: link-local all-nodes " 1419 "multicast address deletion error\n", 1420 __func__); 1421 } else { 1422 /* 1423 * Replace the gateway of the route. 1424 */ 1425 memcpy(rt->rt_gateway, &sin6, sizeof(sin6)); 1426 RTFREE_LOCKED(rt); 1427 } 1428 } else { 1429 if (rt != NULL) 1430 RTFREE_LOCKED(rt); 1431 } 1432 1433 /* 1434 * Remove the node-local all-nodes address. 1435 */ 1436 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1437 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1438 return (error); 1439 1440 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 1441 if (rt != NULL && rt->rt_gateway != NULL && 1442 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 1443 &ia->ia_addr.sin6_addr, 1444 sizeof(ia->ia_addr.sin6_addr)) == 0)) { 1445 /* 1446 * If no more IPv6 address exists on this interface then 1447 * remove the multicast address route. 1448 */ 1449 if (ifa0 == NULL) { 1450 memcpy(&mltaddr.sin6_addr, 1451 &satosin6(rt_key(rt))->sin6_addr, 1452 sizeof(mltaddr.sin6_addr)); 1453 1454 RTFREE_LOCKED(rt); 1455 error = in6_rtrequest(RTM_DELETE, 1456 (struct sockaddr *)&mltaddr, 1457 (struct sockaddr *)&ia->ia_addr, 1458 (struct sockaddr *)&mltmask, RTF_UP, 1459 (struct rtentry **)0, RT_DEFAULT_FIB); 1460 if (error) 1461 log(LOG_INFO, "%s: node-local all-nodes" 1462 "multicast address deletion error\n", 1463 __func__); 1464 } else { 1465 /* 1466 * Replace the gateway of the route. 1467 */ 1468 memcpy(rt->rt_gateway, &sin6, sizeof(sin6)); 1469 RTFREE_LOCKED(rt); 1470 } 1471 } else { 1472 if (rt != NULL) 1473 RTFREE_LOCKED(rt); 1474 } 1475 1476 return (0); 1477} 1478 1479void 1480in6_purgeaddr(struct ifaddr *ifa) 1481{ 1482 struct ifnet *ifp = ifa->ifa_ifp; 1483 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1484 int plen, error; 1485 struct ifaddr *ifa0; 1486 1487 if (ifa->ifa_carp) 1488 (*carp_detach_p)(ifa); 1489 1490 /* 1491 * find another IPv6 address as the gateway for the 1492 * link-local and node-local all-nodes multicast 1493 * address routes 1494 */ 1495 IF_ADDR_RLOCK(ifp); 1496 TAILQ_FOREACH(ifa0, &ifp->if_addrhead, ifa_link) { 1497 if ((ifa0->ifa_addr->sa_family != AF_INET6) || 1498 memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr, 1499 &ia->ia_addr.sin6_addr, sizeof(struct in6_addr)) == 0) 1500 continue; 1501 else 1502 break; 1503 } 1504 if (ifa0 != NULL) 1505 ifa_ref(ifa0); 1506 IF_ADDR_RUNLOCK(ifp); 1507 1508 /* 1509 * Remove the loopback route to the interface address. 1510 * The check for the current setting of "nd6_useloopback" 1511 * is not needed. 1512 */ 1513 if (ia->ia_flags & IFA_RTSELF) { 1514 error = ifa_del_loopback_route((struct ifaddr *)ia, 1515 (struct sockaddr *)&ia->ia_addr); 1516 if (error == 0) 1517 ia->ia_flags &= ~IFA_RTSELF; 1518 } 1519 1520 /* stop DAD processing */ 1521 nd6_dad_stop(ifa); 1522 1523 /* Remove local address entry from lltable. */ 1524 in6_ifremloop(ifa); 1525 1526 /* Leave multicast groups. */ 1527 error = in6_purgeaddr_mc(ifp, ia, ifa0); 1528 1529 if (ifa0 != NULL) 1530 ifa_free(ifa0); 1531 1532 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1533 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) { 1534 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags | 1535 (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0); 1536 if (error != 0) 1537 log(LOG_INFO, "%s: err=%d, destination address delete " 1538 "failed\n", __func__, error); 1539 ia->ia_flags &= ~IFA_ROUTE; 1540 } 1541 1542 in6_unlink_ifa(ia, ifp); 1543} 1544 1545static void 1546in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1547{ 1548 char ip6buf[INET6_ADDRSTRLEN]; 1549 1550 IF_ADDR_WLOCK(ifp); 1551 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1552 IF_ADDR_WUNLOCK(ifp); 1553 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1554 1555 /* 1556 * Defer the release of what might be the last reference to the 1557 * in6_ifaddr so that it can't be freed before the remainder of the 1558 * cleanup. 1559 */ 1560 IN6_IFADDR_WLOCK(); 1561 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 1562 LIST_REMOVE(ia, ia6_hash); 1563 IN6_IFADDR_WUNLOCK(); 1564 1565 /* 1566 * Release the reference to the base prefix. There should be a 1567 * positive reference. 1568 */ 1569 if (ia->ia6_ndpr == NULL) { 1570 nd6log((LOG_NOTICE, 1571 "in6_unlink_ifa: autoconf'ed address " 1572 "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia)))); 1573 } else { 1574 ia->ia6_ndpr->ndpr_refcnt--; 1575 ia->ia6_ndpr = NULL; 1576 } 1577 1578 /* 1579 * Also, if the address being removed is autoconf'ed, call 1580 * pfxlist_onlink_check() since the release might affect the status of 1581 * other (detached) addresses. 1582 */ 1583 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1584 pfxlist_onlink_check(); 1585 } 1586 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1587} 1588 1589void 1590in6_purgeif(struct ifnet *ifp) 1591{ 1592 struct ifaddr *ifa, *nifa; 1593 1594 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) { 1595 if (ifa->ifa_addr->sa_family != AF_INET6) 1596 continue; 1597 in6_purgeaddr(ifa); 1598 } 1599 1600 in6_ifdetach(ifp); 1601} 1602 1603/* 1604 * SIOC[GAD]LIFADDR. 1605 * SIOCGLIFADDR: get first address. (?) 1606 * SIOCGLIFADDR with IFLR_PREFIX: 1607 * get first address that matches the specified prefix. 1608 * SIOCALIFADDR: add the specified address. 1609 * SIOCALIFADDR with IFLR_PREFIX: 1610 * add the specified prefix, filling hostid part from 1611 * the first link-local address. prefixlen must be <= 64. 1612 * SIOCDLIFADDR: delete the specified address. 1613 * SIOCDLIFADDR with IFLR_PREFIX: 1614 * delete the first address that matches the specified prefix. 1615 * return values: 1616 * EINVAL on invalid parameters 1617 * EADDRNOTAVAIL on prefix match failed/specified address not found 1618 * other values may be returned from in6_ioctl() 1619 * 1620 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1621 * this is to accomodate address naming scheme other than RFC2374, 1622 * in the future. 1623 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1624 * address encoding scheme. (see figure on page 8) 1625 */ 1626static int 1627in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 1628 struct ifnet *ifp, struct thread *td) 1629{ 1630 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1631 struct ifaddr *ifa; 1632 struct sockaddr *sa; 1633 1634 /* sanity checks */ 1635 if (!data || !ifp) { 1636 panic("invalid argument to in6_lifaddr_ioctl"); 1637 /* NOTREACHED */ 1638 } 1639 1640 switch (cmd) { 1641 case SIOCGLIFADDR: 1642 /* address must be specified on GET with IFLR_PREFIX */ 1643 if ((iflr->flags & IFLR_PREFIX) == 0) 1644 break; 1645 /* FALLTHROUGH */ 1646 case SIOCALIFADDR: 1647 case SIOCDLIFADDR: 1648 /* address must be specified on ADD and DELETE */ 1649 sa = (struct sockaddr *)&iflr->addr; 1650 if (sa->sa_family != AF_INET6) 1651 return EINVAL; 1652 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1653 return EINVAL; 1654 /* XXX need improvement */ 1655 sa = (struct sockaddr *)&iflr->dstaddr; 1656 if (sa->sa_family && sa->sa_family != AF_INET6) 1657 return EINVAL; 1658 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1659 return EINVAL; 1660 break; 1661 default: /* shouldn't happen */ 1662#if 0 1663 panic("invalid cmd to in6_lifaddr_ioctl"); 1664 /* NOTREACHED */ 1665#else 1666 return EOPNOTSUPP; 1667#endif 1668 } 1669 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) 1670 return EINVAL; 1671 1672 switch (cmd) { 1673 case SIOCALIFADDR: 1674 { 1675 struct in6_aliasreq ifra; 1676 struct in6_addr *hostid = NULL; 1677 int prefixlen; 1678 1679 ifa = NULL; 1680 if ((iflr->flags & IFLR_PREFIX) != 0) { 1681 struct sockaddr_in6 *sin6; 1682 1683 /* 1684 * hostid is to fill in the hostid part of the 1685 * address. hostid points to the first link-local 1686 * address attached to the interface. 1687 */ 1688 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1689 if (!ifa) 1690 return EADDRNOTAVAIL; 1691 hostid = IFA_IN6(ifa); 1692 1693 /* prefixlen must be <= 64. */ 1694 if (64 < iflr->prefixlen) { 1695 if (ifa != NULL) 1696 ifa_free(ifa); 1697 return EINVAL; 1698 } 1699 prefixlen = iflr->prefixlen; 1700 1701 /* hostid part must be zero. */ 1702 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1703 if (sin6->sin6_addr.s6_addr32[2] != 0 || 1704 sin6->sin6_addr.s6_addr32[3] != 0) { 1705 if (ifa != NULL) 1706 ifa_free(ifa); 1707 return EINVAL; 1708 } 1709 } else 1710 prefixlen = iflr->prefixlen; 1711 1712 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1713 bzero(&ifra, sizeof(ifra)); 1714 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name)); 1715 1716 bcopy(&iflr->addr, &ifra.ifra_addr, 1717 ((struct sockaddr *)&iflr->addr)->sa_len); 1718 if (hostid) { 1719 /* fill in hostid part */ 1720 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1721 hostid->s6_addr32[2]; 1722 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1723 hostid->s6_addr32[3]; 1724 } 1725 1726 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1727 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1728 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1729 if (hostid) { 1730 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1731 hostid->s6_addr32[2]; 1732 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1733 hostid->s6_addr32[3]; 1734 } 1735 } 1736 if (ifa != NULL) 1737 ifa_free(ifa); 1738 1739 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1740 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1741 1742 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1743 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td); 1744 } 1745 case SIOCGLIFADDR: 1746 case SIOCDLIFADDR: 1747 { 1748 struct in6_ifaddr *ia; 1749 struct in6_addr mask, candidate, match; 1750 struct sockaddr_in6 *sin6; 1751 int cmp; 1752 1753 bzero(&mask, sizeof(mask)); 1754 if (iflr->flags & IFLR_PREFIX) { 1755 /* lookup a prefix rather than address. */ 1756 in6_prefixlen2mask(&mask, iflr->prefixlen); 1757 1758 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1759 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1760 match.s6_addr32[0] &= mask.s6_addr32[0]; 1761 match.s6_addr32[1] &= mask.s6_addr32[1]; 1762 match.s6_addr32[2] &= mask.s6_addr32[2]; 1763 match.s6_addr32[3] &= mask.s6_addr32[3]; 1764 1765 /* if you set extra bits, that's wrong */ 1766 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1767 return EINVAL; 1768 1769 cmp = 1; 1770 } else { 1771 if (cmd == SIOCGLIFADDR) { 1772 /* on getting an address, take the 1st match */ 1773 cmp = 0; /* XXX */ 1774 } else { 1775 /* on deleting an address, do exact match */ 1776 in6_prefixlen2mask(&mask, 128); 1777 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1778 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1779 1780 cmp = 1; 1781 } 1782 } 1783 1784 IF_ADDR_RLOCK(ifp); 1785 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1786 if (ifa->ifa_addr->sa_family != AF_INET6) 1787 continue; 1788 if (!cmp) 1789 break; 1790 1791 /* 1792 * XXX: this is adhoc, but is necessary to allow 1793 * a user to specify fe80::/64 (not /10) for a 1794 * link-local address. 1795 */ 1796 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1797 in6_clearscope(&candidate); 1798 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1799 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1800 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1801 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1802 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1803 break; 1804 } 1805 if (ifa != NULL) 1806 ifa_ref(ifa); 1807 IF_ADDR_RUNLOCK(ifp); 1808 if (!ifa) 1809 return EADDRNOTAVAIL; 1810 ia = ifa2ia6(ifa); 1811 1812 if (cmd == SIOCGLIFADDR) { 1813 int error; 1814 1815 /* fill in the if_laddrreq structure */ 1816 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1817 error = sa6_recoverscope( 1818 (struct sockaddr_in6 *)&iflr->addr); 1819 if (error != 0) { 1820 ifa_free(ifa); 1821 return (error); 1822 } 1823 1824 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1825 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1826 ia->ia_dstaddr.sin6_len); 1827 error = sa6_recoverscope( 1828 (struct sockaddr_in6 *)&iflr->dstaddr); 1829 if (error != 0) { 1830 ifa_free(ifa); 1831 return (error); 1832 } 1833 } else 1834 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1835 1836 iflr->prefixlen = 1837 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1838 1839 iflr->flags = ia->ia6_flags; /* XXX */ 1840 ifa_free(ifa); 1841 1842 return 0; 1843 } else { 1844 struct in6_aliasreq ifra; 1845 1846 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1847 bzero(&ifra, sizeof(ifra)); 1848 bcopy(iflr->iflr_name, ifra.ifra_name, 1849 sizeof(ifra.ifra_name)); 1850 1851 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1852 ia->ia_addr.sin6_len); 1853 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1854 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1855 ia->ia_dstaddr.sin6_len); 1856 } else { 1857 bzero(&ifra.ifra_dstaddr, 1858 sizeof(ifra.ifra_dstaddr)); 1859 } 1860 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1861 ia->ia_prefixmask.sin6_len); 1862 1863 ifra.ifra_flags = ia->ia6_flags; 1864 ifa_free(ifa); 1865 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, 1866 ifp, td); 1867 } 1868 } 1869 } 1870 1871 return EOPNOTSUPP; /* just for safety */ 1872} 1873 1874/* 1875 * Initialize an interface's IPv6 address and routing table entry. 1876 */ 1877static int 1878in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1879 struct sockaddr_in6 *sin6, int newhost) 1880{ 1881 int error = 0, plen, ifacount = 0; 1882 struct ifaddr *ifa; 1883 1884 /* 1885 * Give the interface a chance to initialize 1886 * if this is its first address, 1887 * and to validate the address if necessary. 1888 */ 1889 IF_ADDR_RLOCK(ifp); 1890 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1891 if (ifa->ifa_addr->sa_family != AF_INET6) 1892 continue; 1893 ifacount++; 1894 } 1895 IF_ADDR_RUNLOCK(ifp); 1896 1897 ia->ia_addr = *sin6; 1898 1899 if (ifacount <= 1 && ifp->if_ioctl) { 1900 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1901 if (error) 1902 return (error); 1903 } 1904 1905 ia->ia_ifa.ifa_metric = ifp->if_metric; 1906 1907 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1908 1909 /* 1910 * Special case: 1911 * If a new destination address is specified for a point-to-point 1912 * interface, install a route to the destination as an interface 1913 * direct route. 1914 * XXX: the logic below rejects assigning multiple addresses on a p2p 1915 * interface that share the same destination. 1916 */ 1917 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1918 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 && 1919 ia->ia_dstaddr.sin6_family == AF_INET6) { 1920 int rtflags = RTF_UP | RTF_HOST; 1921 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags); 1922 if (error) 1923 return (error); 1924 ia->ia_flags |= IFA_ROUTE; 1925 /* 1926 * Handle the case for ::1 . 1927 */ 1928 if (ifp->if_flags & IFF_LOOPBACK) 1929 ia->ia_flags |= IFA_RTSELF; 1930 } 1931 1932 /* 1933 * add a loopback route to self 1934 */ 1935 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) { 1936 error = ifa_add_loopback_route((struct ifaddr *)ia, 1937 (struct sockaddr *)&ia->ia_addr); 1938 if (error == 0) 1939 ia->ia_flags |= IFA_RTSELF; 1940 } 1941 1942 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1943 if (newhost) 1944 in6_ifaddloop(&(ia->ia_ifa)); 1945 1946 return (error); 1947} 1948 1949/* 1950 * Find an IPv6 interface link-local address specific to an interface. 1951 * ifaddr is returned referenced. 1952 */ 1953struct in6_ifaddr * 1954in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1955{ 1956 struct ifaddr *ifa; 1957 1958 IF_ADDR_RLOCK(ifp); 1959 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1960 if (ifa->ifa_addr->sa_family != AF_INET6) 1961 continue; 1962 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1963 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1964 ignoreflags) != 0) 1965 continue; 1966 ifa_ref(ifa); 1967 break; 1968 } 1969 } 1970 IF_ADDR_RUNLOCK(ifp); 1971 1972 return ((struct in6_ifaddr *)ifa); 1973} 1974 1975 1976/* 1977 * find the internet address corresponding to a given interface and address. 1978 * ifaddr is returned referenced. 1979 */ 1980struct in6_ifaddr * 1981in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr) 1982{ 1983 struct ifaddr *ifa; 1984 1985 IF_ADDR_RLOCK(ifp); 1986 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1987 if (ifa->ifa_addr->sa_family != AF_INET6) 1988 continue; 1989 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1990 ifa_ref(ifa); 1991 break; 1992 } 1993 } 1994 IF_ADDR_RUNLOCK(ifp); 1995 1996 return ((struct in6_ifaddr *)ifa); 1997} 1998 1999/* 2000 * Find a link-local scoped address on ifp and return it if any. 2001 */ 2002struct in6_ifaddr * 2003in6ifa_llaonifp(struct ifnet *ifp) 2004{ 2005 struct sockaddr_in6 *sin6; 2006 struct ifaddr *ifa; 2007 2008 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 2009 return (NULL); 2010 if_addr_rlock(ifp); 2011 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2012 if (ifa->ifa_addr->sa_family != AF_INET6) 2013 continue; 2014 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 2015 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 2016 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) || 2017 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr)) 2018 break; 2019 } 2020 if_addr_runlock(ifp); 2021 2022 return ((struct in6_ifaddr *)ifa); 2023} 2024 2025/* 2026 * Convert IP6 address to printable (loggable) representation. Caller 2027 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 2028 */ 2029static char digits[] = "0123456789abcdef"; 2030char * 2031ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 2032{ 2033 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0; 2034 char *cp; 2035 const u_int16_t *a = (const u_int16_t *)addr; 2036 const u_int8_t *d; 2037 int dcolon = 0, zero = 0; 2038 2039 cp = ip6buf; 2040 2041 for (i = 0; i < 8; i++) { 2042 if (*(a + i) == 0) { 2043 cnt++; 2044 if (cnt == 1) 2045 idx = i; 2046 } 2047 else if (maxcnt < cnt) { 2048 maxcnt = cnt; 2049 index = idx; 2050 cnt = 0; 2051 } 2052 } 2053 if (maxcnt < cnt) { 2054 maxcnt = cnt; 2055 index = idx; 2056 } 2057 2058 for (i = 0; i < 8; i++) { 2059 if (dcolon == 1) { 2060 if (*a == 0) { 2061 if (i == 7) 2062 *cp++ = ':'; 2063 a++; 2064 continue; 2065 } else 2066 dcolon = 2; 2067 } 2068 if (*a == 0) { 2069 if (dcolon == 0 && *(a + 1) == 0 && i == index) { 2070 if (i == 0) 2071 *cp++ = ':'; 2072 *cp++ = ':'; 2073 dcolon = 1; 2074 } else { 2075 *cp++ = '0'; 2076 *cp++ = ':'; 2077 } 2078 a++; 2079 continue; 2080 } 2081 d = (const u_char *)a; 2082 /* Try to eliminate leading zeros in printout like in :0001. */ 2083 zero = 1; 2084 *cp = digits[*d >> 4]; 2085 if (*cp != '0') { 2086 zero = 0; 2087 cp++; 2088 } 2089 *cp = digits[*d++ & 0xf]; 2090 if (zero == 0 || (*cp != '0')) { 2091 zero = 0; 2092 cp++; 2093 } 2094 *cp = digits[*d >> 4]; 2095 if (zero == 0 || (*cp != '0')) { 2096 zero = 0; 2097 cp++; 2098 } 2099 *cp++ = digits[*d & 0xf]; 2100 *cp++ = ':'; 2101 a++; 2102 } 2103 *--cp = '\0'; 2104 return (ip6buf); 2105} 2106 2107int 2108in6_localaddr(struct in6_addr *in6) 2109{ 2110 struct in6_ifaddr *ia; 2111 2112 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 2113 return 1; 2114 2115 IN6_IFADDR_RLOCK(); 2116 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 2117 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 2118 &ia->ia_prefixmask.sin6_addr)) { 2119 IN6_IFADDR_RUNLOCK(); 2120 return 1; 2121 } 2122 } 2123 IN6_IFADDR_RUNLOCK(); 2124 2125 return (0); 2126} 2127 2128/* 2129 * Return 1 if an internet address is for the local host and configured 2130 * on one of its interfaces. 2131 */ 2132int 2133in6_localip(struct in6_addr *in6) 2134{ 2135 struct in6_ifaddr *ia; 2136 2137 IN6_IFADDR_RLOCK(); 2138 LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 2139 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) { 2140 IN6_IFADDR_RUNLOCK(); 2141 return (1); 2142 } 2143 } 2144 IN6_IFADDR_RUNLOCK(); 2145 return (0); 2146} 2147 2148int 2149in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 2150{ 2151 struct in6_ifaddr *ia; 2152 2153 IN6_IFADDR_RLOCK(); 2154 LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) { 2155 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) { 2156 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2157 IN6_IFADDR_RUNLOCK(); 2158 return (1); /* true */ 2159 } 2160 break; 2161 } 2162 } 2163 IN6_IFADDR_RUNLOCK(); 2164 2165 return (0); /* false */ 2166} 2167 2168/* 2169 * return length of part which dst and src are equal 2170 * hard coding... 2171 */ 2172int 2173in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 2174{ 2175 int match = 0; 2176 u_char *s = (u_char *)src, *d = (u_char *)dst; 2177 u_char *lim = s + 16, r; 2178 2179 while (s < lim) 2180 if ((r = (*d++ ^ *s++)) != 0) { 2181 while (r < 128) { 2182 match++; 2183 r <<= 1; 2184 } 2185 break; 2186 } else 2187 match += 8; 2188 return match; 2189} 2190 2191/* XXX: to be scope conscious */ 2192int 2193in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 2194{ 2195 int bytelen, bitlen; 2196 2197 /* sanity check */ 2198 if (0 > len || len > 128) { 2199 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 2200 len); 2201 return (0); 2202 } 2203 2204 bytelen = len / 8; 2205 bitlen = len % 8; 2206 2207 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 2208 return (0); 2209 if (bitlen != 0 && 2210 p1->s6_addr[bytelen] >> (8 - bitlen) != 2211 p2->s6_addr[bytelen] >> (8 - bitlen)) 2212 return (0); 2213 2214 return (1); 2215} 2216 2217void 2218in6_prefixlen2mask(struct in6_addr *maskp, int len) 2219{ 2220 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 2221 int bytelen, bitlen, i; 2222 2223 /* sanity check */ 2224 if (0 > len || len > 128) { 2225 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 2226 len); 2227 return; 2228 } 2229 2230 bzero(maskp, sizeof(*maskp)); 2231 bytelen = len / 8; 2232 bitlen = len % 8; 2233 for (i = 0; i < bytelen; i++) 2234 maskp->s6_addr[i] = 0xff; 2235 if (bitlen) 2236 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 2237} 2238 2239/* 2240 * return the best address out of the same scope. if no address was 2241 * found, return the first valid address from designated IF. 2242 */ 2243struct in6_ifaddr * 2244in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2245{ 2246 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2247 struct ifaddr *ifa; 2248 struct in6_ifaddr *besta = 0; 2249 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2250 2251 dep[0] = dep[1] = NULL; 2252 2253 /* 2254 * We first look for addresses in the same scope. 2255 * If there is one, return it. 2256 * If two or more, return one which matches the dst longest. 2257 * If none, return one of global addresses assigned other ifs. 2258 */ 2259 IF_ADDR_RLOCK(ifp); 2260 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2261 if (ifa->ifa_addr->sa_family != AF_INET6) 2262 continue; 2263 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2264 continue; /* XXX: is there any case to allow anycast? */ 2265 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2266 continue; /* don't use this interface */ 2267 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2268 continue; 2269 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2270 if (V_ip6_use_deprecated) 2271 dep[0] = (struct in6_ifaddr *)ifa; 2272 continue; 2273 } 2274 2275 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2276 /* 2277 * call in6_matchlen() as few as possible 2278 */ 2279 if (besta) { 2280 if (blen == -1) 2281 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2282 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2283 if (tlen > blen) { 2284 blen = tlen; 2285 besta = (struct in6_ifaddr *)ifa; 2286 } 2287 } else 2288 besta = (struct in6_ifaddr *)ifa; 2289 } 2290 } 2291 if (besta) { 2292 ifa_ref(&besta->ia_ifa); 2293 IF_ADDR_RUNLOCK(ifp); 2294 return (besta); 2295 } 2296 2297 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2298 if (ifa->ifa_addr->sa_family != AF_INET6) 2299 continue; 2300 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2301 continue; /* XXX: is there any case to allow anycast? */ 2302 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2303 continue; /* don't use this interface */ 2304 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2305 continue; 2306 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2307 if (V_ip6_use_deprecated) 2308 dep[1] = (struct in6_ifaddr *)ifa; 2309 continue; 2310 } 2311 2312 if (ifa != NULL) 2313 ifa_ref(ifa); 2314 IF_ADDR_RUNLOCK(ifp); 2315 return (struct in6_ifaddr *)ifa; 2316 } 2317 2318 /* use the last-resort values, that are, deprecated addresses */ 2319 if (dep[0]) { 2320 ifa_ref((struct ifaddr *)dep[0]); 2321 IF_ADDR_RUNLOCK(ifp); 2322 return dep[0]; 2323 } 2324 if (dep[1]) { 2325 ifa_ref((struct ifaddr *)dep[1]); 2326 IF_ADDR_RUNLOCK(ifp); 2327 return dep[1]; 2328 } 2329 2330 IF_ADDR_RUNLOCK(ifp); 2331 return NULL; 2332} 2333 2334/* 2335 * perform DAD when interface becomes IFF_UP. 2336 */ 2337void 2338in6_if_up(struct ifnet *ifp) 2339{ 2340 struct ifaddr *ifa; 2341 struct in6_ifaddr *ia; 2342 2343 IF_ADDR_RLOCK(ifp); 2344 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2345 if (ifa->ifa_addr->sa_family != AF_INET6) 2346 continue; 2347 ia = (struct in6_ifaddr *)ifa; 2348 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2349 /* 2350 * The TENTATIVE flag was likely set by hand 2351 * beforehand, implicitly indicating the need for DAD. 2352 * We may be able to skip the random delay in this 2353 * case, but we impose delays just in case. 2354 */ 2355 nd6_dad_start(ifa, 2356 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 2357 } 2358 } 2359 IF_ADDR_RUNLOCK(ifp); 2360 2361 /* 2362 * special cases, like 6to4, are handled in in6_ifattach 2363 */ 2364 in6_ifattach(ifp, NULL); 2365} 2366 2367int 2368in6if_do_dad(struct ifnet *ifp) 2369{ 2370 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 2371 return (0); 2372 2373 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) || 2374 (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD)) 2375 return (0); 2376 2377 switch (ifp->if_type) { 2378#ifdef IFT_DUMMY 2379 case IFT_DUMMY: 2380#endif 2381 case IFT_FAITH: 2382 /* 2383 * These interfaces do not have the IFF_LOOPBACK flag, 2384 * but loop packets back. We do not have to do DAD on such 2385 * interfaces. We should even omit it, because loop-backed 2386 * NS would confuse the DAD procedure. 2387 */ 2388 return (0); 2389 default: 2390 /* 2391 * Our DAD routine requires the interface up and running. 2392 * However, some interfaces can be up before the RUNNING 2393 * status. Additionaly, users may try to assign addresses 2394 * before the interface becomes up (or running). 2395 * We simply skip DAD in such a case as a work around. 2396 * XXX: we should rather mark "tentative" on such addresses, 2397 * and do DAD after the interface becomes ready. 2398 */ 2399 if (!((ifp->if_flags & IFF_UP) && 2400 (ifp->if_drv_flags & IFF_DRV_RUNNING))) 2401 return (0); 2402 2403 return (1); 2404 } 2405} 2406 2407/* 2408 * Calculate max IPv6 MTU through all the interfaces and store it 2409 * to in6_maxmtu. 2410 */ 2411void 2412in6_setmaxmtu(void) 2413{ 2414 unsigned long maxmtu = 0; 2415 struct ifnet *ifp; 2416 2417 IFNET_RLOCK_NOSLEEP(); 2418 TAILQ_FOREACH(ifp, &V_ifnet, if_list) { 2419 /* this function can be called during ifnet initialization */ 2420 if (!ifp->if_afdata[AF_INET6]) 2421 continue; 2422 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2423 IN6_LINKMTU(ifp) > maxmtu) 2424 maxmtu = IN6_LINKMTU(ifp); 2425 } 2426 IFNET_RUNLOCK_NOSLEEP(); 2427 if (maxmtu) /* update only when maxmtu is positive */ 2428 V_in6_maxmtu = maxmtu; 2429} 2430 2431/* 2432 * Provide the length of interface identifiers to be used for the link attached 2433 * to the given interface. The length should be defined in "IPv6 over 2434 * xxx-link" document. Note that address architecture might also define 2435 * the length for a particular set of address prefixes, regardless of the 2436 * link type. As clarified in rfc2462bis, those two definitions should be 2437 * consistent, and those really are as of August 2004. 2438 */ 2439int 2440in6_if2idlen(struct ifnet *ifp) 2441{ 2442 switch (ifp->if_type) { 2443 case IFT_ETHER: /* RFC2464 */ 2444#ifdef IFT_PROPVIRTUAL 2445 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2446#endif 2447#ifdef IFT_L2VLAN 2448 case IFT_L2VLAN: /* ditto */ 2449#endif 2450#ifdef IFT_IEEE80211 2451 case IFT_IEEE80211: /* ditto */ 2452#endif 2453#ifdef IFT_MIP 2454 case IFT_MIP: /* ditto */ 2455#endif 2456 case IFT_INFINIBAND: 2457 return (64); 2458 case IFT_FDDI: /* RFC2467 */ 2459 return (64); 2460 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 2461 return (64); 2462 case IFT_PPP: /* RFC2472 */ 2463 return (64); 2464 case IFT_ARCNET: /* RFC2497 */ 2465 return (64); 2466 case IFT_FRELAY: /* RFC2590 */ 2467 return (64); 2468 case IFT_IEEE1394: /* RFC3146 */ 2469 return (64); 2470 case IFT_GIF: 2471 return (64); /* draft-ietf-v6ops-mech-v2-07 */ 2472 case IFT_LOOP: 2473 return (64); /* XXX: is this really correct? */ 2474 default: 2475 /* 2476 * Unknown link type: 2477 * It might be controversial to use the today's common constant 2478 * of 64 for these cases unconditionally. For full compliance, 2479 * we should return an error in this case. On the other hand, 2480 * if we simply miss the standard for the link type or a new 2481 * standard is defined for a new link type, the IFID length 2482 * is very likely to be the common constant. As a compromise, 2483 * we always use the constant, but make an explicit notice 2484 * indicating the "unknown" case. 2485 */ 2486 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2487 return (64); 2488 } 2489} 2490 2491#include <sys/sysctl.h> 2492 2493struct in6_llentry { 2494 struct llentry base; 2495 struct sockaddr_in6 l3_addr6; 2496}; 2497 2498/* 2499 * Deletes an address from the address table. 2500 * This function is called by the timer functions 2501 * such as arptimer() and nd6_llinfo_timer(), and 2502 * the caller does the locking. 2503 */ 2504static void 2505in6_lltable_free(struct lltable *llt, struct llentry *lle) 2506{ 2507 LLE_WUNLOCK(lle); 2508 LLE_LOCK_DESTROY(lle); 2509 free(lle, M_LLTABLE); 2510} 2511 2512static struct llentry * 2513in6_lltable_new(const struct sockaddr *l3addr, u_int flags) 2514{ 2515 struct in6_llentry *lle; 2516 2517 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 2518 if (lle == NULL) /* NB: caller generates msg */ 2519 return NULL; 2520 2521 lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr; 2522 lle->base.lle_refcnt = 1; 2523 lle->base.lle_free = in6_lltable_free; 2524 LLE_LOCK_INIT(&lle->base); 2525 callout_init(&lle->base.ln_timer_ch, 1); 2526 2527 return (&lle->base); 2528} 2529 2530static void 2531in6_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix, 2532 const struct sockaddr *mask, u_int flags) 2533{ 2534 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix; 2535 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask; 2536 struct llentry *lle, *next; 2537 int i; 2538 2539 /* 2540 * (flags & LLE_STATIC) means deleting all entries 2541 * including static ND6 entries. 2542 */ 2543 IF_AFDATA_WLOCK(llt->llt_ifp); 2544 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 2545 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 2546 if (IN6_ARE_MASKED_ADDR_EQUAL( 2547 &satosin6(L3_ADDR(lle))->sin6_addr, 2548 &pfx->sin6_addr, &msk->sin6_addr) && 2549 ((flags & LLE_STATIC) || 2550 !(lle->la_flags & LLE_STATIC))) { 2551 LLE_WLOCK(lle); 2552 if (callout_stop(&lle->la_timer)) 2553 LLE_REMREF(lle); 2554 llentry_free(lle); 2555 } 2556 } 2557 } 2558 IF_AFDATA_WUNLOCK(llt->llt_ifp); 2559} 2560 2561static int 2562in6_lltable_rtcheck(struct ifnet *ifp, 2563 u_int flags, 2564 const struct sockaddr *l3addr) 2565{ 2566 struct rtentry *rt; 2567 char ip6buf[INET6_ADDRSTRLEN]; 2568 2569 KASSERT(l3addr->sa_family == AF_INET6, 2570 ("sin_family %d", l3addr->sa_family)); 2571 2572 /* Our local addresses are always only installed on the default FIB. */ 2573 /* XXX rtalloc1 should take a const param */ 2574 rt = in6_rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0, 2575 RT_DEFAULT_FIB); 2576 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 2577 struct ifaddr *ifa; 2578 /* 2579 * Create an ND6 cache for an IPv6 neighbor 2580 * that is not covered by our own prefix. 2581 */ 2582 /* XXX ifaof_ifpforaddr should take a const param */ 2583 ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp); 2584 if (ifa != NULL) { 2585 ifa_free(ifa); 2586 if (rt != NULL) 2587 RTFREE_LOCKED(rt); 2588 return 0; 2589 } 2590 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2591 ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr)); 2592 if (rt != NULL) 2593 RTFREE_LOCKED(rt); 2594 return EINVAL; 2595 } 2596 RTFREE_LOCKED(rt); 2597 return 0; 2598} 2599 2600static struct llentry * 2601in6_lltable_lookup(struct lltable *llt, u_int flags, 2602 const struct sockaddr *l3addr) 2603{ 2604 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2605 struct ifnet *ifp = llt->llt_ifp; 2606 struct llentry *lle; 2607 struct llentries *lleh; 2608 u_int hashkey; 2609 2610 IF_AFDATA_LOCK_ASSERT(ifp); 2611 KASSERT(l3addr->sa_family == AF_INET6, 2612 ("sin_family %d", l3addr->sa_family)); 2613 2614 hashkey = sin6->sin6_addr.s6_addr32[3]; 2615 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 2616 LIST_FOREACH(lle, lleh, lle_next) { 2617 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle); 2618 if (lle->la_flags & LLE_DELETED) 2619 continue; 2620 if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr, 2621 sizeof(struct in6_addr)) == 0) 2622 break; 2623 } 2624 2625 if (lle == NULL) { 2626 if (!(flags & LLE_CREATE)) 2627 return (NULL); 2628 IF_AFDATA_WLOCK_ASSERT(ifp); 2629 /* 2630 * A route that covers the given address must have 2631 * been installed 1st because we are doing a resolution, 2632 * verify this. 2633 */ 2634 if (!(flags & LLE_IFADDR) && 2635 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2636 return NULL; 2637 2638 lle = in6_lltable_new(l3addr, flags); 2639 if (lle == NULL) { 2640 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2641 return NULL; 2642 } 2643 lle->la_flags = flags & ~LLE_CREATE; 2644 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 2645 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 2646 lle->la_flags |= (LLE_VALID | LLE_STATIC); 2647 } 2648 2649 lle->lle_tbl = llt; 2650 lle->lle_head = lleh; 2651 lle->la_flags |= LLE_LINKED; 2652 LIST_INSERT_HEAD(lleh, lle, lle_next); 2653 } else if (flags & LLE_DELETE) { 2654 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 2655 LLE_WLOCK(lle); 2656 lle->la_flags |= LLE_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