in6.c revision 271185
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 271185 2014-09-06 04:39:26Z markj $"); 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_AFDATA_LOCK(ifp); 159 ifa->ifa_rtrequest = nd6_rtrequest; 160 ln = lla_lookup(LLTABLE6(ifp), (LLE_CREATE | LLE_IFADDR | 161 LLE_EXCLUSIVE), (struct sockaddr *)&ia->ia_addr); 162 IF_AFDATA_UNLOCK(ifp); 163 if (ln != NULL) { 164 ln->la_expire = 0; /* for IPv6 this means permanent */ 165 ln->ln_state = ND6_LLINFO_REACHABLE; 166 /* 167 * initialize for rtmsg generation 168 */ 169 bzero(&gateway, sizeof(gateway)); 170 gateway.sdl_len = sizeof(gateway); 171 gateway.sdl_family = AF_LINK; 172 gateway.sdl_nlen = 0; 173 gateway.sdl_alen = 6; 174 memcpy(gateway.sdl_data, &ln->ll_addr.mac_aligned, 175 sizeof(ln->ll_addr)); 176 LLE_WUNLOCK(ln); 177 } 178 179 bzero(&rt, sizeof(rt)); 180 rt.rt_gateway = (struct sockaddr *)&gateway; 181 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 182 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr)); 183 rt_mask(&rt) = (struct sockaddr *)&mask; 184 rt_key(&rt) = (struct sockaddr *)&addr; 185 rt.rt_flags = RTF_UP | RTF_HOST | RTF_STATIC; 186 /* Announce arrival of local address to all FIBs. */ 187 rt_newaddrmsg(RTM_ADD, ifa, 0, &rt); 188} 189 190void 191in6_ifremloop(struct ifaddr *ifa) 192{ 193 struct sockaddr_dl gateway; 194 struct sockaddr_in6 mask, addr; 195 struct rtentry rt0; 196 struct in6_ifaddr *ia; 197 struct ifnet *ifp; 198 199 ia = ifa2ia6(ifa); 200 ifp = ifa->ifa_ifp; 201 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr)); 202 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 203 lltable_prefix_free(AF_INET6, (struct sockaddr *)&addr, 204 (struct sockaddr *)&mask, LLE_STATIC); 205 206 /* 207 * initialize for rtmsg generation 208 */ 209 bzero(&gateway, sizeof(gateway)); 210 gateway.sdl_len = sizeof(gateway); 211 gateway.sdl_family = AF_LINK; 212 gateway.sdl_nlen = 0; 213 gateway.sdl_alen = ifp->if_addrlen; 214 bzero(&rt0, sizeof(rt0)); 215 rt0.rt_gateway = (struct sockaddr *)&gateway; 216 rt_mask(&rt0) = (struct sockaddr *)&mask; 217 rt_key(&rt0) = (struct sockaddr *)&addr; 218 rt0.rt_flags = RTF_HOST | RTF_STATIC; 219 /* Announce removal of local address to all FIBs. */ 220 rt_newaddrmsg(RTM_DELETE, ifa, 0, &rt0); 221} 222 223int 224in6_mask2len(struct in6_addr *mask, u_char *lim0) 225{ 226 int x = 0, y; 227 u_char *lim = lim0, *p; 228 229 /* ignore the scope_id part */ 230 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 231 lim = (u_char *)mask + sizeof(*mask); 232 for (p = (u_char *)mask; p < lim; x++, p++) { 233 if (*p != 0xff) 234 break; 235 } 236 y = 0; 237 if (p < lim) { 238 for (y = 0; y < 8; y++) { 239 if ((*p & (0x80 >> y)) == 0) 240 break; 241 } 242 } 243 244 /* 245 * when the limit pointer is given, do a stricter check on the 246 * remaining bits. 247 */ 248 if (p < lim) { 249 if (y != 0 && (*p & (0x00ff >> y)) != 0) 250 return (-1); 251 for (p = p + 1; p < lim; p++) 252 if (*p != 0) 253 return (-1); 254 } 255 256 return x * 8 + y; 257} 258 259#ifdef COMPAT_FREEBSD32 260struct in6_ndifreq32 { 261 char ifname[IFNAMSIZ]; 262 uint32_t ifindex; 263}; 264#define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32) 265#endif 266 267int 268in6_control(struct socket *so, u_long cmd, caddr_t data, 269 struct ifnet *ifp, struct thread *td) 270{ 271 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 272 struct in6_ifaddr *ia = NULL; 273 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 274 struct sockaddr_in6 *sa6; 275 int carp_attached = 0; 276 int error; 277 u_long ocmd = cmd; 278 279 /* 280 * Compat to make pre-10.x ifconfig(8) operable. 281 */ 282 if (cmd == OSIOCAIFADDR_IN6) 283 cmd = SIOCAIFADDR_IN6; 284 285 switch (cmd) { 286 case SIOCGETSGCNT_IN6: 287 case SIOCGETMIFCNT_IN6: 288 /* 289 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c. 290 * We cannot see how that would be needed, so do not adjust the 291 * KPI blindly; more likely should clean up the IPv4 variant. 292 */ 293 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP); 294 } 295 296 switch (cmd) { 297 case SIOCAADDRCTL_POLICY: 298 case SIOCDADDRCTL_POLICY: 299 if (td != NULL) { 300 error = priv_check(td, PRIV_NETINET_ADDRCTRL6); 301 if (error) 302 return (error); 303 } 304 return (in6_src_ioctl(cmd, data)); 305 } 306 307 if (ifp == NULL) 308 return (EOPNOTSUPP); 309 310 switch (cmd) { 311 case SIOCSNDFLUSH_IN6: 312 case SIOCSPFXFLUSH_IN6: 313 case SIOCSRTRFLUSH_IN6: 314 case SIOCSDEFIFACE_IN6: 315 case SIOCSIFINFO_FLAGS: 316 case SIOCSIFINFO_IN6: 317 if (td != NULL) { 318 error = priv_check(td, PRIV_NETINET_ND6); 319 if (error) 320 return (error); 321 } 322 /* FALLTHROUGH */ 323 case OSIOCGIFINFO_IN6: 324 case SIOCGIFINFO_IN6: 325 case SIOCGDRLST_IN6: 326 case SIOCGPRLST_IN6: 327 case SIOCGNBRINFO_IN6: 328 case SIOCGDEFIFACE_IN6: 329 return (nd6_ioctl(cmd, data, ifp)); 330 331#ifdef COMPAT_FREEBSD32 332 case SIOCGDEFIFACE32_IN6: 333 { 334 struct in6_ndifreq ndif; 335 struct in6_ndifreq32 *ndif32; 336 337 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif, 338 ifp); 339 if (error) 340 return (error); 341 ndif32 = (struct in6_ndifreq32 *)data; 342 ndif32->ifindex = ndif.ifindex; 343 return (0); 344 } 345#endif 346 } 347 348 switch (cmd) { 349 case SIOCSIFPREFIX_IN6: 350 case SIOCDIFPREFIX_IN6: 351 case SIOCAIFPREFIX_IN6: 352 case SIOCCIFPREFIX_IN6: 353 case SIOCSGIFPREFIX_IN6: 354 case SIOCGIFPREFIX_IN6: 355 log(LOG_NOTICE, 356 "prefix ioctls are now invalidated. " 357 "please use ifconfig.\n"); 358 return (EOPNOTSUPP); 359 } 360 361 switch (cmd) { 362 case SIOCSSCOPE6: 363 if (td != NULL) { 364 error = priv_check(td, PRIV_NETINET_SCOPE6); 365 if (error) 366 return (error); 367 } 368 /* FALLTHROUGH */ 369 case SIOCGSCOPE6: 370 case SIOCGSCOPE6DEF: 371 return (scope6_ioctl(cmd, data, ifp)); 372 } 373 374 switch (cmd) { 375 case SIOCALIFADDR: 376 if (td != NULL) { 377 error = priv_check(td, PRIV_NET_ADDIFADDR); 378 if (error) 379 return (error); 380 } 381 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 382 383 case SIOCDLIFADDR: 384 if (td != NULL) { 385 error = priv_check(td, PRIV_NET_DELIFADDR); 386 if (error) 387 return (error); 388 } 389 /* FALLTHROUGH */ 390 case SIOCGLIFADDR: 391 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 392 } 393 394 /* 395 * Find address for this interface, if it exists. 396 * 397 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 398 * only, and used the first interface address as the target of other 399 * operations (without checking ifra_addr). This was because netinet 400 * code/API assumed at most 1 interface address per interface. 401 * Since IPv6 allows a node to assign multiple addresses 402 * on a single interface, we almost always look and check the 403 * presence of ifra_addr, and reject invalid ones here. 404 * It also decreases duplicated code among SIOC*_IN6 operations. 405 */ 406 switch (cmd) { 407 case SIOCAIFADDR_IN6: 408 case SIOCSIFPHYADDR_IN6: 409 sa6 = &ifra->ifra_addr; 410 break; 411 case SIOCSIFADDR_IN6: 412 case SIOCGIFADDR_IN6: 413 case SIOCSIFDSTADDR_IN6: 414 case SIOCSIFNETMASK_IN6: 415 case SIOCGIFDSTADDR_IN6: 416 case SIOCGIFNETMASK_IN6: 417 case SIOCDIFADDR_IN6: 418 case SIOCGIFPSRCADDR_IN6: 419 case SIOCGIFPDSTADDR_IN6: 420 case SIOCGIFAFLAG_IN6: 421 case SIOCSNDFLUSH_IN6: 422 case SIOCSPFXFLUSH_IN6: 423 case SIOCSRTRFLUSH_IN6: 424 case SIOCGIFALIFETIME_IN6: 425 case SIOCSIFALIFETIME_IN6: 426 case SIOCGIFSTAT_IN6: 427 case SIOCGIFSTAT_ICMP6: 428 sa6 = &ifr->ifr_addr; 429 break; 430 case SIOCSIFADDR: 431 case SIOCSIFBRDADDR: 432 case SIOCSIFDSTADDR: 433 case SIOCSIFNETMASK: 434 /* 435 * Although we should pass any non-INET6 ioctl requests 436 * down to driver, we filter some legacy INET requests. 437 * Drivers trust SIOCSIFADDR et al to come from an already 438 * privileged layer, and do not perform any credentials 439 * checks or input validation. 440 */ 441 return (EINVAL); 442 default: 443 sa6 = NULL; 444 break; 445 } 446 if (sa6 && sa6->sin6_family == AF_INET6) { 447 if (sa6->sin6_scope_id != 0) 448 error = sa6_embedscope(sa6, 0); 449 else 450 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 451 if (error != 0) 452 return (error); 453 if (td != NULL && (error = prison_check_ip6(td->td_ucred, 454 &sa6->sin6_addr)) != 0) 455 return (error); 456 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 457 } else 458 ia = NULL; 459 460 switch (cmd) { 461 case SIOCSIFADDR_IN6: 462 case SIOCSIFDSTADDR_IN6: 463 case SIOCSIFNETMASK_IN6: 464 /* 465 * Since IPv6 allows a node to assign multiple addresses 466 * on a single interface, SIOCSIFxxx ioctls are deprecated. 467 */ 468 /* we decided to obsolete this command (20000704) */ 469 error = EINVAL; 470 goto out; 471 472 case SIOCDIFADDR_IN6: 473 /* 474 * for IPv4, we look for existing in_ifaddr here to allow 475 * "ifconfig if0 delete" to remove the first IPv4 address on 476 * the interface. For IPv6, as the spec allows multiple 477 * interface address from the day one, we consider "remove the 478 * first one" semantics to be not preferable. 479 */ 480 if (ia == NULL) { 481 error = EADDRNOTAVAIL; 482 goto out; 483 } 484 /* FALLTHROUGH */ 485 case SIOCAIFADDR_IN6: 486 /* 487 * We always require users to specify a valid IPv6 address for 488 * the corresponding operation. 489 */ 490 if (ifra->ifra_addr.sin6_family != AF_INET6 || 491 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 492 error = EAFNOSUPPORT; 493 goto out; 494 } 495 496 if (td != NULL) { 497 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 498 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR); 499 if (error) 500 goto out; 501 } 502 /* FALLTHROUGH */ 503 case SIOCGIFSTAT_IN6: 504 case SIOCGIFSTAT_ICMP6: 505 if (ifp->if_afdata[AF_INET6] == NULL) { 506 error = EPFNOSUPPORT; 507 goto out; 508 } 509 break; 510 511 case SIOCGIFADDR_IN6: 512 /* This interface is basically deprecated. use SIOCGIFCONF. */ 513 /* FALLTHROUGH */ 514 case SIOCGIFAFLAG_IN6: 515 case SIOCGIFNETMASK_IN6: 516 case SIOCGIFDSTADDR_IN6: 517 case SIOCGIFALIFETIME_IN6: 518 /* must think again about its semantics */ 519 if (ia == NULL) { 520 error = EADDRNOTAVAIL; 521 goto out; 522 } 523 break; 524 525 case SIOCSIFALIFETIME_IN6: 526 { 527 struct in6_addrlifetime *lt; 528 529 if (td != NULL) { 530 error = priv_check(td, PRIV_NETINET_ALIFETIME6); 531 if (error) 532 goto out; 533 } 534 if (ia == NULL) { 535 error = EADDRNOTAVAIL; 536 goto out; 537 } 538 /* sanity for overflow - beware unsigned */ 539 lt = &ifr->ifr_ifru.ifru_lifetime; 540 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME && 541 lt->ia6t_vltime + time_uptime < time_uptime) { 542 error = EINVAL; 543 goto out; 544 } 545 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME && 546 lt->ia6t_pltime + time_uptime < time_uptime) { 547 error = EINVAL; 548 goto out; 549 } 550 break; 551 } 552 } 553 554 switch (cmd) { 555 case SIOCGIFADDR_IN6: 556 ifr->ifr_addr = ia->ia_addr; 557 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 558 goto out; 559 break; 560 561 case SIOCGIFDSTADDR_IN6: 562 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 563 error = EINVAL; 564 goto out; 565 } 566 /* 567 * XXX: should we check if ifa_dstaddr is NULL and return 568 * an error? 569 */ 570 ifr->ifr_dstaddr = ia->ia_dstaddr; 571 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 572 goto out; 573 break; 574 575 case SIOCGIFNETMASK_IN6: 576 ifr->ifr_addr = ia->ia_prefixmask; 577 break; 578 579 case SIOCGIFAFLAG_IN6: 580 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 581 break; 582 583 case SIOCGIFSTAT_IN6: 584 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 585 ifp->if_afdata[AF_INET6])->in6_ifstat, 586 &ifr->ifr_ifru.ifru_stat, 587 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 588 break; 589 590 case SIOCGIFSTAT_ICMP6: 591 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 592 ifp->if_afdata[AF_INET6])->icmp6_ifstat, 593 &ifr->ifr_ifru.ifru_icmp6stat, 594 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 595 break; 596 597 case SIOCGIFALIFETIME_IN6: 598 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 599 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 600 time_t maxexpire; 601 struct in6_addrlifetime *retlt = 602 &ifr->ifr_ifru.ifru_lifetime; 603 604 /* 605 * XXX: adjust expiration time assuming time_t is 606 * signed. 607 */ 608 maxexpire = (-1) & 609 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 610 if (ia->ia6_lifetime.ia6t_vltime < 611 maxexpire - ia->ia6_updatetime) { 612 retlt->ia6t_expire = ia->ia6_updatetime + 613 ia->ia6_lifetime.ia6t_vltime; 614 } else 615 retlt->ia6t_expire = maxexpire; 616 } 617 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 618 time_t maxexpire; 619 struct in6_addrlifetime *retlt = 620 &ifr->ifr_ifru.ifru_lifetime; 621 622 /* 623 * XXX: adjust expiration time assuming time_t is 624 * signed. 625 */ 626 maxexpire = (-1) & 627 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 628 if (ia->ia6_lifetime.ia6t_pltime < 629 maxexpire - ia->ia6_updatetime) { 630 retlt->ia6t_preferred = ia->ia6_updatetime + 631 ia->ia6_lifetime.ia6t_pltime; 632 } else 633 retlt->ia6t_preferred = maxexpire; 634 } 635 break; 636 637 case SIOCSIFALIFETIME_IN6: 638 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; 639 /* for sanity */ 640 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 641 ia->ia6_lifetime.ia6t_expire = 642 time_uptime + ia->ia6_lifetime.ia6t_vltime; 643 } else 644 ia->ia6_lifetime.ia6t_expire = 0; 645 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 646 ia->ia6_lifetime.ia6t_preferred = 647 time_uptime + ia->ia6_lifetime.ia6t_pltime; 648 } else 649 ia->ia6_lifetime.ia6t_preferred = 0; 650 break; 651 652 case SIOCAIFADDR_IN6: 653 { 654 int i; 655 struct nd_prefixctl pr0; 656 struct nd_prefix *pr; 657 658 /* 659 * first, make or update the interface address structure, 660 * and link it to the list. 661 */ 662 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 663 goto out; 664 if (ia != NULL) 665 ifa_free(&ia->ia_ifa); 666 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 667 == NULL) { 668 /* 669 * this can happen when the user specify the 0 valid 670 * lifetime. 671 */ 672 break; 673 } 674 675 if (cmd == ocmd && ifra->ifra_vhid > 0) { 676 if (carp_attach_p != NULL) 677 error = (*carp_attach_p)(&ia->ia_ifa, 678 ifra->ifra_vhid); 679 else 680 error = EPROTONOSUPPORT; 681 if (error) 682 goto out; 683 else 684 carp_attached = 1; 685 } 686 687 /* 688 * then, make the prefix on-link on the interface. 689 * XXX: we'd rather create the prefix before the address, but 690 * we need at least one address to install the corresponding 691 * interface route, so we configure the address first. 692 */ 693 694 /* 695 * convert mask to prefix length (prefixmask has already 696 * been validated in in6_update_ifa(). 697 */ 698 bzero(&pr0, sizeof(pr0)); 699 pr0.ndpr_ifp = ifp; 700 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 701 NULL); 702 if (pr0.ndpr_plen == 128) { 703 break; /* we don't need to install a host route. */ 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 if (pr == NULL) { 736 if (carp_attached) 737 (*carp_detach_p)(&ia->ia_ifa); 738 log(LOG_ERR, "nd6_prelist_add succeeded but " 739 "no prefix\n"); 740 error = EINVAL; 741 goto out; 742 } 743 } 744 745 /* relate the address to the prefix */ 746 if (ia->ia6_ndpr == NULL) { 747 ia->ia6_ndpr = pr; 748 pr->ndpr_refcnt++; 749 750 /* 751 * If this is the first autoconf address from the 752 * prefix, create a temporary address as well 753 * (when required). 754 */ 755 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 756 V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) { 757 int e; 758 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 759 log(LOG_NOTICE, "in6_control: failed " 760 "to create a temporary address, " 761 "errno=%d\n", e); 762 } 763 } 764 } 765 766 /* 767 * this might affect the status of autoconfigured addresses, 768 * that is, this address might make other addresses detached. 769 */ 770 pfxlist_onlink_check(); 771 if (error == 0 && ia) { 772 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) { 773 /* 774 * Try to clear the flag when a new 775 * IPv6 address is added onto an 776 * IFDISABLED interface and it 777 * succeeds. 778 */ 779 struct in6_ndireq nd; 780 781 memset(&nd, 0, sizeof(nd)); 782 nd.ndi.flags = ND_IFINFO(ifp)->flags; 783 nd.ndi.flags &= ~ND6_IFF_IFDISABLED; 784 if (nd6_ioctl(SIOCSIFINFO_FLAGS, 785 (caddr_t)&nd, ifp) < 0) 786 log(LOG_NOTICE, "SIOCAIFADDR_IN6: " 787 "SIOCSIFINFO_FLAGS for -ifdisabled " 788 "failed."); 789 /* 790 * Ignore failure of clearing the flag 791 * intentionally. The failure means 792 * address duplication was detected. 793 */ 794 } 795 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 796 } 797 break; 798 } 799 800 case SIOCDIFADDR_IN6: 801 { 802 struct nd_prefix *pr; 803 804 /* 805 * If the address being deleted is the only one that owns 806 * the corresponding prefix, expire the prefix as well. 807 * XXX: theoretically, we don't have to worry about such 808 * relationship, since we separate the address management 809 * and the prefix management. We do this, however, to provide 810 * as much backward compatibility as possible in terms of 811 * the ioctl operation. 812 * Note that in6_purgeaddr() will decrement ndpr_refcnt. 813 */ 814 pr = ia->ia6_ndpr; 815 in6_purgeaddr(&ia->ia_ifa); 816 if (pr && pr->ndpr_refcnt == 0) 817 prelist_remove(pr); 818 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 819 break; 820 } 821 822 default: 823 if (ifp->if_ioctl == NULL) { 824 error = EOPNOTSUPP; 825 goto out; 826 } 827 error = (*ifp->if_ioctl)(ifp, cmd, data); 828 goto out; 829 } 830 831 error = 0; 832out: 833 if (ia != NULL) 834 ifa_free(&ia->ia_ifa); 835 return (error); 836} 837 838 839/* 840 * Join necessary multicast groups. Factored out from in6_update_ifa(). 841 * This entire work should only be done once, for the default FIB. 842 */ 843static int 844in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra, 845 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol) 846{ 847 char ip6buf[INET6_ADDRSTRLEN]; 848 struct sockaddr_in6 mltaddr, mltmask; 849 struct in6_addr llsol; 850 struct in6_multi_mship *imm; 851 struct rtentry *rt; 852 int delay, error; 853 854 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__)); 855 856 /* Join solicited multicast addr for new host id. */ 857 bzero(&llsol, sizeof(struct in6_addr)); 858 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL; 859 llsol.s6_addr32[1] = 0; 860 llsol.s6_addr32[2] = htonl(1); 861 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 862 llsol.s6_addr8[12] = 0xff; 863 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) { 864 /* XXX: should not happen */ 865 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 866 goto cleanup; 867 } 868 delay = 0; 869 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 870 /* 871 * We need a random delay for DAD on the address being 872 * configured. It also means delaying transmission of the 873 * corresponding MLD report to avoid report collision. 874 * [RFC 4861, Section 6.3.7] 875 */ 876 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 877 } 878 imm = in6_joingroup(ifp, &llsol, &error, delay); 879 if (imm == NULL) { 880 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 881 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &llsol), 882 if_name(ifp), error)); 883 goto cleanup; 884 } 885 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 886 *in6m_sol = imm->i6mm_maddr; 887 888 bzero(&mltmask, sizeof(mltmask)); 889 mltmask.sin6_len = sizeof(struct sockaddr_in6); 890 mltmask.sin6_family = AF_INET6; 891 mltmask.sin6_addr = in6mask32; 892#define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */ 893 894 /* 895 * Join link-local all-nodes address. 896 */ 897 bzero(&mltaddr, sizeof(mltaddr)); 898 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 899 mltaddr.sin6_family = AF_INET6; 900 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 901 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 902 goto cleanup; /* XXX: should not fail */ 903 904 /* 905 * XXX: do we really need this automatic routes? We should probably 906 * reconsider this stuff. Most applications actually do not need the 907 * routes, since they usually specify the outgoing interface. 908 */ 909 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 910 if (rt != NULL) { 911 /* XXX: only works in !SCOPEDROUTING case. */ 912 if (memcmp(&mltaddr.sin6_addr, 913 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, 914 MLTMASK_LEN)) { 915 RTFREE_LOCKED(rt); 916 rt = NULL; 917 } 918 } 919 if (rt == NULL) { 920 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr, 921 (struct sockaddr *)&ia->ia_addr, 922 (struct sockaddr *)&mltmask, RTF_UP, 923 (struct rtentry **)0, RT_DEFAULT_FIB); 924 if (error) 925 goto cleanup; 926 } else 927 RTFREE_LOCKED(rt); 928 929 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 930 if (imm == NULL) { 931 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 932 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 933 &mltaddr.sin6_addr), if_name(ifp), error)); 934 goto cleanup; 935 } 936 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 937 938 /* 939 * Join node information group address. 940 */ 941 delay = 0; 942 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 943 /* 944 * The spec does not say anything about delay for this group, 945 * but the same logic should apply. 946 */ 947 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 948 } 949 if (in6_nigroup(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) { 950 /* XXX jinmei */ 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 if (V_icmp6_nodeinfo_oldmcprefix && 961 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) { 962 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay); 963 if (imm == NULL) 964 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 965 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 966 &mltaddr.sin6_addr), if_name(ifp), error)); 967 /* XXX not very fatal, go on... */ 968 else 969 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 970 } 971 972 /* 973 * Join interface-local all-nodes address. 974 * (ff01::1%ifN, and ff01::%ifN/32) 975 */ 976 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 977 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 978 goto cleanup; /* XXX: should not fail */ 979 /* XXX: again, do we really need the route? */ 980 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 981 if (rt != NULL) { 982 if (memcmp(&mltaddr.sin6_addr, 983 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, 984 MLTMASK_LEN)) { 985 RTFREE_LOCKED(rt); 986 rt = NULL; 987 } 988 } 989 if (rt == NULL) { 990 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr, 991 (struct sockaddr *)&ia->ia_addr, 992 (struct sockaddr *)&mltmask, RTF_UP, 993 (struct rtentry **)0, RT_DEFAULT_FIB); 994 if (error) 995 goto cleanup; 996 } else 997 RTFREE_LOCKED(rt); 998 999 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1000 if (imm == NULL) { 1001 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 1002 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 1003 &mltaddr.sin6_addr), if_name(ifp), error)); 1004 goto cleanup; 1005 } 1006 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1007#undef MLTMASK_LEN 1008 1009cleanup: 1010 return (error); 1011} 1012 1013/* 1014 * Update parameters of an IPv6 interface address. 1015 * If necessary, a new entry is created and linked into address chains. 1016 * This function is separated from in6_control(). 1017 */ 1018int 1019in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1020 struct in6_ifaddr *ia, int flags) 1021{ 1022 int error = 0, hostIsNew = 0, plen = -1; 1023 struct sockaddr_in6 dst6; 1024 struct in6_addrlifetime *lt; 1025 struct in6_multi *in6m_sol; 1026 int delay; 1027 char ip6buf[INET6_ADDRSTRLEN]; 1028 1029 /* Validate parameters */ 1030 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 1031 return (EINVAL); 1032 1033 /* 1034 * The destination address for a p2p link must have a family 1035 * of AF_UNSPEC or AF_INET6. 1036 */ 1037 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 1038 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 1039 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 1040 return (EAFNOSUPPORT); 1041 /* 1042 * validate ifra_prefixmask. don't check sin6_family, netmask 1043 * does not carry fields other than sin6_len. 1044 */ 1045 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 1046 return (EINVAL); 1047 /* 1048 * Because the IPv6 address architecture is classless, we require 1049 * users to specify a (non 0) prefix length (mask) for a new address. 1050 * We also require the prefix (when specified) mask is valid, and thus 1051 * reject a non-consecutive mask. 1052 */ 1053 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 1054 return (EINVAL); 1055 if (ifra->ifra_prefixmask.sin6_len != 0) { 1056 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 1057 (u_char *)&ifra->ifra_prefixmask + 1058 ifra->ifra_prefixmask.sin6_len); 1059 if (plen <= 0) 1060 return (EINVAL); 1061 } else { 1062 /* 1063 * In this case, ia must not be NULL. We just use its prefix 1064 * length. 1065 */ 1066 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1067 } 1068 /* 1069 * If the destination address on a p2p interface is specified, 1070 * and the address is a scoped one, validate/set the scope 1071 * zone identifier. 1072 */ 1073 dst6 = ifra->ifra_dstaddr; 1074 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 1075 (dst6.sin6_family == AF_INET6)) { 1076 struct in6_addr in6_tmp; 1077 u_int32_t zoneid; 1078 1079 in6_tmp = dst6.sin6_addr; 1080 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 1081 return (EINVAL); /* XXX: should be impossible */ 1082 1083 if (dst6.sin6_scope_id != 0) { 1084 if (dst6.sin6_scope_id != zoneid) 1085 return (EINVAL); 1086 } else /* user omit to specify the ID. */ 1087 dst6.sin6_scope_id = zoneid; 1088 1089 /* convert into the internal form */ 1090 if (sa6_embedscope(&dst6, 0)) 1091 return (EINVAL); /* XXX: should be impossible */ 1092 } 1093 /* 1094 * The destination address can be specified only for a p2p or a 1095 * loopback interface. If specified, the corresponding prefix length 1096 * must be 128. 1097 */ 1098 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 1099 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 1100 /* XXX: noisy message */ 1101 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 1102 "be specified for a p2p or a loopback IF only\n")); 1103 return (EINVAL); 1104 } 1105 if (plen != 128) { 1106 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 1107 "be 128 when dstaddr is specified\n")); 1108 return (EINVAL); 1109 } 1110 } 1111 /* lifetime consistency check */ 1112 lt = &ifra->ifra_lifetime; 1113 if (lt->ia6t_pltime > lt->ia6t_vltime) 1114 return (EINVAL); 1115 if (lt->ia6t_vltime == 0) { 1116 /* 1117 * the following log might be noisy, but this is a typical 1118 * configuration mistake or a tool's bug. 1119 */ 1120 nd6log((LOG_INFO, 1121 "in6_update_ifa: valid lifetime is 0 for %s\n", 1122 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr))); 1123 1124 if (ia == NULL) 1125 return (0); /* there's nothing to do */ 1126 } 1127 1128 /* 1129 * If this is a new address, allocate a new ifaddr and link it 1130 * into chains. 1131 */ 1132 if (ia == NULL) { 1133 hostIsNew = 1; 1134 /* 1135 * When in6_update_ifa() is called in a process of a received 1136 * RA, it is called under an interrupt context. So, we should 1137 * call malloc with M_NOWAIT. 1138 */ 1139 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR, 1140 M_NOWAIT); 1141 if (ia == NULL) 1142 return (ENOBUFS); 1143 bzero((caddr_t)ia, sizeof(*ia)); 1144 ifa_init(&ia->ia_ifa); 1145 LIST_INIT(&ia->ia6_memberships); 1146 /* Initialize the address and masks, and put time stamp */ 1147 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1148 ia->ia_addr.sin6_family = AF_INET6; 1149 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 1150 ia->ia6_createtime = time_uptime; 1151 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1152 /* 1153 * XXX: some functions expect that ifa_dstaddr is not 1154 * NULL for p2p interfaces. 1155 */ 1156 ia->ia_ifa.ifa_dstaddr = 1157 (struct sockaddr *)&ia->ia_dstaddr; 1158 } else { 1159 ia->ia_ifa.ifa_dstaddr = NULL; 1160 } 1161 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 1162 ia->ia_ifp = ifp; 1163 ifa_ref(&ia->ia_ifa); /* if_addrhead */ 1164 IF_ADDR_WLOCK(ifp); 1165 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1166 IF_ADDR_WUNLOCK(ifp); 1167 1168 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */ 1169 IN6_IFADDR_WLOCK(); 1170 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link); 1171 LIST_INSERT_HEAD(IN6ADDR_HASH(&ifra->ifra_addr.sin6_addr), 1172 ia, ia6_hash); 1173 IN6_IFADDR_WUNLOCK(); 1174 } 1175 1176 /* update timestamp */ 1177 ia->ia6_updatetime = time_uptime; 1178 1179 /* set prefix mask */ 1180 if (ifra->ifra_prefixmask.sin6_len) { 1181 /* 1182 * We prohibit changing the prefix length of an existing 1183 * address, because 1184 * + such an operation should be rare in IPv6, and 1185 * + the operation would confuse prefix management. 1186 */ 1187 if (ia->ia_prefixmask.sin6_len && 1188 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 1189 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an" 1190 " existing (%s) address should not be changed\n", 1191 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1192 error = EINVAL; 1193 goto unlink; 1194 } 1195 ia->ia_prefixmask = ifra->ifra_prefixmask; 1196 ia->ia_prefixmask.sin6_family = AF_INET6; 1197 } 1198 1199 /* 1200 * If a new destination address is specified, scrub the old one and 1201 * install the new destination. Note that the interface must be 1202 * p2p or loopback (see the check above.) 1203 */ 1204 if (dst6.sin6_family == AF_INET6 && 1205 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1206 int e; 1207 1208 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1209 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) { 1210 nd6log((LOG_ERR, "in6_update_ifa: failed to remove " 1211 "a route to the old destination: %s\n", 1212 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1213 /* proceed anyway... */ 1214 } else 1215 ia->ia_flags &= ~IFA_ROUTE; 1216 ia->ia_dstaddr = dst6; 1217 } 1218 1219 /* 1220 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1221 * to see if the address is deprecated or invalidated, but initialize 1222 * these members for applications. 1223 */ 1224 ia->ia6_lifetime = ifra->ifra_lifetime; 1225 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1226 ia->ia6_lifetime.ia6t_expire = 1227 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1228 } else 1229 ia->ia6_lifetime.ia6t_expire = 0; 1230 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1231 ia->ia6_lifetime.ia6t_preferred = 1232 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1233 } else 1234 ia->ia6_lifetime.ia6t_preferred = 0; 1235 1236 /* reset the interface and routing table appropriately. */ 1237 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 1238 goto unlink; 1239 1240 /* 1241 * configure address flags. 1242 */ 1243 ia->ia6_flags = ifra->ifra_flags; 1244 /* 1245 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1246 * userland, make it deprecated. 1247 */ 1248 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1249 ia->ia6_lifetime.ia6t_pltime = 0; 1250 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1251 } 1252 /* 1253 * Make the address tentative before joining multicast addresses, 1254 * so that corresponding MLD responses would not have a tentative 1255 * source address. 1256 */ 1257 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1258 if (hostIsNew && in6if_do_dad(ifp)) 1259 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1260 1261 /* DAD should be performed after ND6_IFF_IFDISABLED is cleared. */ 1262 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1263 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1264 1265 /* 1266 * We are done if we have simply modified an existing address. 1267 */ 1268 if (!hostIsNew) 1269 return (error); 1270 1271 /* 1272 * Beyond this point, we should call in6_purgeaddr upon an error, 1273 * not just go to unlink. 1274 */ 1275 1276 /* Join necessary multicast groups. */ 1277 in6m_sol = NULL; 1278 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1279 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol); 1280 if (error) 1281 goto cleanup; 1282 } 1283 1284 /* 1285 * Perform DAD, if needed. 1286 * XXX It may be of use, if we can administratively disable DAD. 1287 */ 1288 if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && 1289 (ia->ia6_flags & IN6_IFF_TENTATIVE)) 1290 { 1291 int mindelay, maxdelay; 1292 1293 delay = 0; 1294 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1295 /* 1296 * We need to impose a delay before sending an NS 1297 * for DAD. Check if we also needed a delay for the 1298 * corresponding MLD message. If we did, the delay 1299 * should be larger than the MLD delay (this could be 1300 * relaxed a bit, but this simple logic is at least 1301 * safe). 1302 * XXX: Break data hiding guidelines and look at 1303 * state for the solicited multicast group. 1304 */ 1305 mindelay = 0; 1306 if (in6m_sol != NULL && 1307 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) { 1308 mindelay = in6m_sol->in6m_timer; 1309 } 1310 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1311 if (maxdelay - mindelay == 0) 1312 delay = 0; 1313 else { 1314 delay = 1315 (arc4random() % (maxdelay - mindelay)) + 1316 mindelay; 1317 } 1318 } 1319 nd6_dad_start((struct ifaddr *)ia, delay); 1320 } 1321 1322 KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew")); 1323 ifa_free(&ia->ia_ifa); 1324 return (error); 1325 1326 unlink: 1327 /* 1328 * XXX: if a change of an existing address failed, keep the entry 1329 * anyway. 1330 */ 1331 if (hostIsNew) { 1332 in6_unlink_ifa(ia, ifp); 1333 ifa_free(&ia->ia_ifa); 1334 } 1335 return (error); 1336 1337 cleanup: 1338 KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew")); 1339 ifa_free(&ia->ia_ifa); 1340 in6_purgeaddr(&ia->ia_ifa); 1341 return error; 1342} 1343 1344/* 1345 * Leave multicast groups. Factored out from in6_purgeaddr(). 1346 * This entire work should only be done once, for the default FIB. 1347 */ 1348static int 1349in6_purgeaddr_mc(struct ifnet *ifp, struct in6_ifaddr *ia, struct ifaddr *ifa0) 1350{ 1351 struct sockaddr_in6 mltaddr, mltmask; 1352 struct in6_multi_mship *imm; 1353 struct rtentry *rt; 1354 struct sockaddr_in6 sin6; 1355 int error; 1356 1357 /* 1358 * Leave from multicast groups we have joined for the interface. 1359 */ 1360 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1361 LIST_REMOVE(imm, i6mm_chain); 1362 in6_leavegroup(imm); 1363 } 1364 1365 /* 1366 * Remove the link-local all-nodes address. 1367 */ 1368 bzero(&mltmask, sizeof(mltmask)); 1369 mltmask.sin6_len = sizeof(struct sockaddr_in6); 1370 mltmask.sin6_family = AF_INET6; 1371 mltmask.sin6_addr = in6mask32; 1372 1373 bzero(&mltaddr, sizeof(mltaddr)); 1374 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 1375 mltaddr.sin6_family = AF_INET6; 1376 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 1377 1378 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1379 return (error); 1380 1381 /* 1382 * As for the mltaddr above, proactively prepare the sin6 to avoid 1383 * rtentry un- and re-locking. 1384 */ 1385 if (ifa0 != NULL) { 1386 bzero(&sin6, sizeof(sin6)); 1387 sin6.sin6_len = sizeof(sin6); 1388 sin6.sin6_family = AF_INET6; 1389 memcpy(&sin6.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, 1390 sizeof(sin6.sin6_addr)); 1391 error = in6_setscope(&sin6.sin6_addr, ifa0->ifa_ifp, NULL); 1392 if (error != 0) 1393 return (error); 1394 } 1395 1396 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 1397 if (rt != NULL && rt->rt_gateway != NULL && 1398 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 1399 &ia->ia_addr.sin6_addr, 1400 sizeof(ia->ia_addr.sin6_addr)) == 0)) { 1401 /* 1402 * If no more IPv6 address exists on this interface then 1403 * remove the multicast address route. 1404 */ 1405 if (ifa0 == NULL) { 1406 memcpy(&mltaddr.sin6_addr, 1407 &satosin6(rt_key(rt))->sin6_addr, 1408 sizeof(mltaddr.sin6_addr)); 1409 RTFREE_LOCKED(rt); 1410 error = in6_rtrequest(RTM_DELETE, 1411 (struct sockaddr *)&mltaddr, 1412 (struct sockaddr *)&ia->ia_addr, 1413 (struct sockaddr *)&mltmask, RTF_UP, 1414 (struct rtentry **)0, RT_DEFAULT_FIB); 1415 if (error) 1416 log(LOG_INFO, "%s: link-local all-nodes " 1417 "multicast address deletion error\n", 1418 __func__); 1419 } else { 1420 /* 1421 * Replace the gateway of the route. 1422 */ 1423 memcpy(rt->rt_gateway, &sin6, sizeof(sin6)); 1424 RTFREE_LOCKED(rt); 1425 } 1426 } else { 1427 if (rt != NULL) 1428 RTFREE_LOCKED(rt); 1429 } 1430 1431 /* 1432 * Remove the node-local all-nodes address. 1433 */ 1434 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1435 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1436 return (error); 1437 1438 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 1439 if (rt != NULL && rt->rt_gateway != NULL && 1440 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 1441 &ia->ia_addr.sin6_addr, 1442 sizeof(ia->ia_addr.sin6_addr)) == 0)) { 1443 /* 1444 * If no more IPv6 address exists on this interface then 1445 * remove the multicast address route. 1446 */ 1447 if (ifa0 == NULL) { 1448 memcpy(&mltaddr.sin6_addr, 1449 &satosin6(rt_key(rt))->sin6_addr, 1450 sizeof(mltaddr.sin6_addr)); 1451 1452 RTFREE_LOCKED(rt); 1453 error = in6_rtrequest(RTM_DELETE, 1454 (struct sockaddr *)&mltaddr, 1455 (struct sockaddr *)&ia->ia_addr, 1456 (struct sockaddr *)&mltmask, RTF_UP, 1457 (struct rtentry **)0, RT_DEFAULT_FIB); 1458 if (error) 1459 log(LOG_INFO, "%s: node-local all-nodes" 1460 "multicast address deletion error\n", 1461 __func__); 1462 } else { 1463 /* 1464 * Replace the gateway of the route. 1465 */ 1466 memcpy(rt->rt_gateway, &sin6, sizeof(sin6)); 1467 RTFREE_LOCKED(rt); 1468 } 1469 } else { 1470 if (rt != NULL) 1471 RTFREE_LOCKED(rt); 1472 } 1473 1474 return (0); 1475} 1476 1477void 1478in6_purgeaddr(struct ifaddr *ifa) 1479{ 1480 struct ifnet *ifp = ifa->ifa_ifp; 1481 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1482 int plen, error; 1483 struct ifaddr *ifa0; 1484 1485 if (ifa->ifa_carp) 1486 (*carp_detach_p)(ifa); 1487 1488 /* 1489 * find another IPv6 address as the gateway for the 1490 * link-local and node-local all-nodes multicast 1491 * address routes 1492 */ 1493 IF_ADDR_RLOCK(ifp); 1494 TAILQ_FOREACH(ifa0, &ifp->if_addrhead, ifa_link) { 1495 if ((ifa0->ifa_addr->sa_family != AF_INET6) || 1496 memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr, 1497 &ia->ia_addr.sin6_addr, sizeof(struct in6_addr)) == 0) 1498 continue; 1499 else 1500 break; 1501 } 1502 if (ifa0 != NULL) 1503 ifa_ref(ifa0); 1504 IF_ADDR_RUNLOCK(ifp); 1505 1506 /* 1507 * Remove the loopback route to the interface address. 1508 * The check for the current setting of "nd6_useloopback" 1509 * is not needed. 1510 */ 1511 if (ia->ia_flags & IFA_RTSELF) { 1512 error = ifa_del_loopback_route((struct ifaddr *)ia, 1513 (struct sockaddr *)&ia->ia_addr); 1514 if (error == 0) 1515 ia->ia_flags &= ~IFA_RTSELF; 1516 } 1517 1518 /* stop DAD processing */ 1519 nd6_dad_stop(ifa); 1520 1521 /* Remove local address entry from lltable. */ 1522 in6_ifremloop(ifa); 1523 1524 /* Leave multicast groups. */ 1525 error = in6_purgeaddr_mc(ifp, ia, ifa0); 1526 1527 if (ifa0 != NULL) 1528 ifa_free(ifa0); 1529 1530 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1531 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) { 1532 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags | 1533 (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0); 1534 if (error != 0) 1535 log(LOG_INFO, "%s: err=%d, destination address delete " 1536 "failed\n", __func__, error); 1537 ia->ia_flags &= ~IFA_ROUTE; 1538 } 1539 1540 in6_unlink_ifa(ia, ifp); 1541} 1542 1543static void 1544in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1545{ 1546 1547 IF_ADDR_WLOCK(ifp); 1548 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1549 IF_ADDR_WUNLOCK(ifp); 1550 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1551 1552 /* 1553 * Defer the release of what might be the last reference to the 1554 * in6_ifaddr so that it can't be freed before the remainder of the 1555 * cleanup. 1556 */ 1557 IN6_IFADDR_WLOCK(); 1558 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 1559 LIST_REMOVE(ia, ia6_hash); 1560 IN6_IFADDR_WUNLOCK(); 1561 1562 /* 1563 * Release the reference to the base prefix. There should be a 1564 * positive reference. 1565 */ 1566 if (ia->ia6_ndpr == NULL) { 1567 nd6log((LOG_NOTICE, 1568 "in6_unlink_ifa: autoconf'ed address " 1569 "%p has no prefix\n", ia)); 1570 } else { 1571 ia->ia6_ndpr->ndpr_refcnt--; 1572 ia->ia6_ndpr = NULL; 1573 } 1574 1575 /* 1576 * Also, if the address being removed is autoconf'ed, call 1577 * pfxlist_onlink_check() since the release might affect the status of 1578 * other (detached) addresses. 1579 */ 1580 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1581 pfxlist_onlink_check(); 1582 } 1583 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1584} 1585 1586void 1587in6_purgeif(struct ifnet *ifp) 1588{ 1589 struct ifaddr *ifa, *nifa; 1590 1591 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) { 1592 if (ifa->ifa_addr->sa_family != AF_INET6) 1593 continue; 1594 in6_purgeaddr(ifa); 1595 } 1596 1597 in6_ifdetach(ifp); 1598} 1599 1600/* 1601 * SIOC[GAD]LIFADDR. 1602 * SIOCGLIFADDR: get first address. (?) 1603 * SIOCGLIFADDR with IFLR_PREFIX: 1604 * get first address that matches the specified prefix. 1605 * SIOCALIFADDR: add the specified address. 1606 * SIOCALIFADDR with IFLR_PREFIX: 1607 * add the specified prefix, filling hostid part from 1608 * the first link-local address. prefixlen must be <= 64. 1609 * SIOCDLIFADDR: delete the specified address. 1610 * SIOCDLIFADDR with IFLR_PREFIX: 1611 * delete the first address that matches the specified prefix. 1612 * return values: 1613 * EINVAL on invalid parameters 1614 * EADDRNOTAVAIL on prefix match failed/specified address not found 1615 * other values may be returned from in6_ioctl() 1616 * 1617 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1618 * this is to accomodate address naming scheme other than RFC2374, 1619 * in the future. 1620 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1621 * address encoding scheme. (see figure on page 8) 1622 */ 1623static int 1624in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 1625 struct ifnet *ifp, struct thread *td) 1626{ 1627 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1628 struct ifaddr *ifa; 1629 struct sockaddr *sa; 1630 1631 /* sanity checks */ 1632 if (!data || !ifp) { 1633 panic("invalid argument to in6_lifaddr_ioctl"); 1634 /* NOTREACHED */ 1635 } 1636 1637 switch (cmd) { 1638 case SIOCGLIFADDR: 1639 /* address must be specified on GET with IFLR_PREFIX */ 1640 if ((iflr->flags & IFLR_PREFIX) == 0) 1641 break; 1642 /* FALLTHROUGH */ 1643 case SIOCALIFADDR: 1644 case SIOCDLIFADDR: 1645 /* address must be specified on ADD and DELETE */ 1646 sa = (struct sockaddr *)&iflr->addr; 1647 if (sa->sa_family != AF_INET6) 1648 return EINVAL; 1649 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1650 return EINVAL; 1651 /* XXX need improvement */ 1652 sa = (struct sockaddr *)&iflr->dstaddr; 1653 if (sa->sa_family && sa->sa_family != AF_INET6) 1654 return EINVAL; 1655 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1656 return EINVAL; 1657 break; 1658 default: /* shouldn't happen */ 1659#if 0 1660 panic("invalid cmd to in6_lifaddr_ioctl"); 1661 /* NOTREACHED */ 1662#else 1663 return EOPNOTSUPP; 1664#endif 1665 } 1666 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) 1667 return EINVAL; 1668 1669 switch (cmd) { 1670 case SIOCALIFADDR: 1671 { 1672 struct in6_aliasreq ifra; 1673 struct in6_addr *hostid = NULL; 1674 int prefixlen; 1675 1676 ifa = NULL; 1677 if ((iflr->flags & IFLR_PREFIX) != 0) { 1678 struct sockaddr_in6 *sin6; 1679 1680 /* 1681 * hostid is to fill in the hostid part of the 1682 * address. hostid points to the first link-local 1683 * address attached to the interface. 1684 */ 1685 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1686 if (!ifa) 1687 return EADDRNOTAVAIL; 1688 hostid = IFA_IN6(ifa); 1689 1690 /* prefixlen must be <= 64. */ 1691 if (64 < iflr->prefixlen) { 1692 if (ifa != NULL) 1693 ifa_free(ifa); 1694 return EINVAL; 1695 } 1696 prefixlen = iflr->prefixlen; 1697 1698 /* hostid part must be zero. */ 1699 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1700 if (sin6->sin6_addr.s6_addr32[2] != 0 || 1701 sin6->sin6_addr.s6_addr32[3] != 0) { 1702 if (ifa != NULL) 1703 ifa_free(ifa); 1704 return EINVAL; 1705 } 1706 } else 1707 prefixlen = iflr->prefixlen; 1708 1709 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1710 bzero(&ifra, sizeof(ifra)); 1711 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name)); 1712 1713 bcopy(&iflr->addr, &ifra.ifra_addr, 1714 ((struct sockaddr *)&iflr->addr)->sa_len); 1715 if (hostid) { 1716 /* fill in hostid part */ 1717 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1718 hostid->s6_addr32[2]; 1719 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1720 hostid->s6_addr32[3]; 1721 } 1722 1723 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1724 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1725 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1726 if (hostid) { 1727 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1728 hostid->s6_addr32[2]; 1729 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1730 hostid->s6_addr32[3]; 1731 } 1732 } 1733 if (ifa != NULL) 1734 ifa_free(ifa); 1735 1736 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1737 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1738 1739 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1740 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td); 1741 } 1742 case SIOCGLIFADDR: 1743 case SIOCDLIFADDR: 1744 { 1745 struct in6_ifaddr *ia; 1746 struct in6_addr mask, candidate, match; 1747 struct sockaddr_in6 *sin6; 1748 int cmp; 1749 1750 bzero(&mask, sizeof(mask)); 1751 if (iflr->flags & IFLR_PREFIX) { 1752 /* lookup a prefix rather than address. */ 1753 in6_prefixlen2mask(&mask, iflr->prefixlen); 1754 1755 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1756 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1757 match.s6_addr32[0] &= mask.s6_addr32[0]; 1758 match.s6_addr32[1] &= mask.s6_addr32[1]; 1759 match.s6_addr32[2] &= mask.s6_addr32[2]; 1760 match.s6_addr32[3] &= mask.s6_addr32[3]; 1761 1762 /* if you set extra bits, that's wrong */ 1763 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1764 return EINVAL; 1765 1766 cmp = 1; 1767 } else { 1768 if (cmd == SIOCGLIFADDR) { 1769 /* on getting an address, take the 1st match */ 1770 cmp = 0; /* XXX */ 1771 } else { 1772 /* on deleting an address, do exact match */ 1773 in6_prefixlen2mask(&mask, 128); 1774 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1775 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1776 1777 cmp = 1; 1778 } 1779 } 1780 1781 IF_ADDR_RLOCK(ifp); 1782 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1783 if (ifa->ifa_addr->sa_family != AF_INET6) 1784 continue; 1785 if (!cmp) 1786 break; 1787 1788 /* 1789 * XXX: this is adhoc, but is necessary to allow 1790 * a user to specify fe80::/64 (not /10) for a 1791 * link-local address. 1792 */ 1793 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1794 in6_clearscope(&candidate); 1795 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1796 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1797 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1798 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1799 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1800 break; 1801 } 1802 if (ifa != NULL) 1803 ifa_ref(ifa); 1804 IF_ADDR_RUNLOCK(ifp); 1805 if (!ifa) 1806 return EADDRNOTAVAIL; 1807 ia = ifa2ia6(ifa); 1808 1809 if (cmd == SIOCGLIFADDR) { 1810 int error; 1811 1812 /* fill in the if_laddrreq structure */ 1813 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1814 error = sa6_recoverscope( 1815 (struct sockaddr_in6 *)&iflr->addr); 1816 if (error != 0) { 1817 ifa_free(ifa); 1818 return (error); 1819 } 1820 1821 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1822 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1823 ia->ia_dstaddr.sin6_len); 1824 error = sa6_recoverscope( 1825 (struct sockaddr_in6 *)&iflr->dstaddr); 1826 if (error != 0) { 1827 ifa_free(ifa); 1828 return (error); 1829 } 1830 } else 1831 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1832 1833 iflr->prefixlen = 1834 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1835 1836 iflr->flags = ia->ia6_flags; /* XXX */ 1837 ifa_free(ifa); 1838 1839 return 0; 1840 } else { 1841 struct in6_aliasreq ifra; 1842 1843 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1844 bzero(&ifra, sizeof(ifra)); 1845 bcopy(iflr->iflr_name, ifra.ifra_name, 1846 sizeof(ifra.ifra_name)); 1847 1848 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1849 ia->ia_addr.sin6_len); 1850 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1851 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1852 ia->ia_dstaddr.sin6_len); 1853 } else { 1854 bzero(&ifra.ifra_dstaddr, 1855 sizeof(ifra.ifra_dstaddr)); 1856 } 1857 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1858 ia->ia_prefixmask.sin6_len); 1859 1860 ifra.ifra_flags = ia->ia6_flags; 1861 ifa_free(ifa); 1862 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, 1863 ifp, td); 1864 } 1865 } 1866 } 1867 1868 return EOPNOTSUPP; /* just for safety */ 1869} 1870 1871/* 1872 * Initialize an interface's IPv6 address and routing table entry. 1873 */ 1874static int 1875in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1876 struct sockaddr_in6 *sin6, int newhost) 1877{ 1878 int error = 0, plen, ifacount = 0; 1879 struct ifaddr *ifa; 1880 1881 /* 1882 * Give the interface a chance to initialize 1883 * if this is its first address, 1884 * and to validate the address if necessary. 1885 */ 1886 IF_ADDR_RLOCK(ifp); 1887 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1888 if (ifa->ifa_addr->sa_family != AF_INET6) 1889 continue; 1890 ifacount++; 1891 } 1892 IF_ADDR_RUNLOCK(ifp); 1893 1894 ia->ia_addr = *sin6; 1895 1896 if (ifacount <= 1 && ifp->if_ioctl) { 1897 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1898 if (error) 1899 return (error); 1900 } 1901 1902 ia->ia_ifa.ifa_metric = ifp->if_metric; 1903 1904 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1905 1906 /* 1907 * Special case: 1908 * If a new destination address is specified for a point-to-point 1909 * interface, install a route to the destination as an interface 1910 * direct route. 1911 * XXX: the logic below rejects assigning multiple addresses on a p2p 1912 * interface that share the same destination. 1913 */ 1914 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1915 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 && 1916 ia->ia_dstaddr.sin6_family == AF_INET6) { 1917 int rtflags = RTF_UP | RTF_HOST; 1918 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags); 1919 if (error) 1920 return (error); 1921 ia->ia_flags |= IFA_ROUTE; 1922 /* 1923 * Handle the case for ::1 . 1924 */ 1925 if (ifp->if_flags & IFF_LOOPBACK) 1926 ia->ia_flags |= IFA_RTSELF; 1927 } 1928 1929 /* 1930 * add a loopback route to self 1931 */ 1932 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) { 1933 error = ifa_add_loopback_route((struct ifaddr *)ia, 1934 (struct sockaddr *)&ia->ia_addr); 1935 if (error == 0) 1936 ia->ia_flags |= IFA_RTSELF; 1937 } 1938 1939 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1940 if (newhost) 1941 in6_ifaddloop(&(ia->ia_ifa)); 1942 1943 return (error); 1944} 1945 1946/* 1947 * Find an IPv6 interface link-local address specific to an interface. 1948 * ifaddr is returned referenced. 1949 */ 1950struct in6_ifaddr * 1951in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1952{ 1953 struct ifaddr *ifa; 1954 1955 IF_ADDR_RLOCK(ifp); 1956 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1957 if (ifa->ifa_addr->sa_family != AF_INET6) 1958 continue; 1959 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1960 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1961 ignoreflags) != 0) 1962 continue; 1963 ifa_ref(ifa); 1964 break; 1965 } 1966 } 1967 IF_ADDR_RUNLOCK(ifp); 1968 1969 return ((struct in6_ifaddr *)ifa); 1970} 1971 1972 1973/* 1974 * find the internet address corresponding to a given interface and address. 1975 * ifaddr is returned referenced. 1976 */ 1977struct in6_ifaddr * 1978in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr) 1979{ 1980 struct ifaddr *ifa; 1981 1982 IF_ADDR_RLOCK(ifp); 1983 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1984 if (ifa->ifa_addr->sa_family != AF_INET6) 1985 continue; 1986 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1987 ifa_ref(ifa); 1988 break; 1989 } 1990 } 1991 IF_ADDR_RUNLOCK(ifp); 1992 1993 return ((struct in6_ifaddr *)ifa); 1994} 1995 1996/* 1997 * Find a link-local scoped address on ifp and return it if any. 1998 */ 1999struct in6_ifaddr * 2000in6ifa_llaonifp(struct ifnet *ifp) 2001{ 2002 struct sockaddr_in6 *sin6; 2003 struct ifaddr *ifa; 2004 2005 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 2006 return (NULL); 2007 if_addr_rlock(ifp); 2008 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2009 if (ifa->ifa_addr->sa_family != AF_INET6) 2010 continue; 2011 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 2012 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 2013 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) || 2014 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr)) 2015 break; 2016 } 2017 if_addr_runlock(ifp); 2018 2019 return ((struct in6_ifaddr *)ifa); 2020} 2021 2022/* 2023 * Convert IP6 address to printable (loggable) representation. Caller 2024 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 2025 */ 2026static char digits[] = "0123456789abcdef"; 2027char * 2028ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 2029{ 2030 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0; 2031 char *cp; 2032 const u_int16_t *a = (const u_int16_t *)addr; 2033 const u_int8_t *d; 2034 int dcolon = 0, zero = 0; 2035 2036 cp = ip6buf; 2037 2038 for (i = 0; i < 8; i++) { 2039 if (*(a + i) == 0) { 2040 cnt++; 2041 if (cnt == 1) 2042 idx = i; 2043 } 2044 else if (maxcnt < cnt) { 2045 maxcnt = cnt; 2046 index = idx; 2047 cnt = 0; 2048 } 2049 } 2050 if (maxcnt < cnt) { 2051 maxcnt = cnt; 2052 index = idx; 2053 } 2054 2055 for (i = 0; i < 8; i++) { 2056 if (dcolon == 1) { 2057 if (*a == 0) { 2058 if (i == 7) 2059 *cp++ = ':'; 2060 a++; 2061 continue; 2062 } else 2063 dcolon = 2; 2064 } 2065 if (*a == 0) { 2066 if (dcolon == 0 && *(a + 1) == 0 && i == index) { 2067 if (i == 0) 2068 *cp++ = ':'; 2069 *cp++ = ':'; 2070 dcolon = 1; 2071 } else { 2072 *cp++ = '0'; 2073 *cp++ = ':'; 2074 } 2075 a++; 2076 continue; 2077 } 2078 d = (const u_char *)a; 2079 /* Try to eliminate leading zeros in printout like in :0001. */ 2080 zero = 1; 2081 *cp = digits[*d >> 4]; 2082 if (*cp != '0') { 2083 zero = 0; 2084 cp++; 2085 } 2086 *cp = digits[*d++ & 0xf]; 2087 if (zero == 0 || (*cp != '0')) { 2088 zero = 0; 2089 cp++; 2090 } 2091 *cp = digits[*d >> 4]; 2092 if (zero == 0 || (*cp != '0')) { 2093 zero = 0; 2094 cp++; 2095 } 2096 *cp++ = digits[*d & 0xf]; 2097 *cp++ = ':'; 2098 a++; 2099 } 2100 *--cp = '\0'; 2101 return (ip6buf); 2102} 2103 2104int 2105in6_localaddr(struct in6_addr *in6) 2106{ 2107 struct in6_ifaddr *ia; 2108 2109 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 2110 return 1; 2111 2112 IN6_IFADDR_RLOCK(); 2113 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 2114 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 2115 &ia->ia_prefixmask.sin6_addr)) { 2116 IN6_IFADDR_RUNLOCK(); 2117 return 1; 2118 } 2119 } 2120 IN6_IFADDR_RUNLOCK(); 2121 2122 return (0); 2123} 2124 2125/* 2126 * Return 1 if an internet address is for the local host and configured 2127 * on one of its interfaces. 2128 */ 2129int 2130in6_localip(struct in6_addr *in6) 2131{ 2132 struct in6_ifaddr *ia; 2133 2134 IN6_IFADDR_RLOCK(); 2135 LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 2136 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) { 2137 IN6_IFADDR_RUNLOCK(); 2138 return (1); 2139 } 2140 } 2141 IN6_IFADDR_RUNLOCK(); 2142 return (0); 2143} 2144 2145int 2146in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 2147{ 2148 struct in6_ifaddr *ia; 2149 2150 IN6_IFADDR_RLOCK(); 2151 LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) { 2152 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) { 2153 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2154 IN6_IFADDR_RUNLOCK(); 2155 return (1); /* true */ 2156 } 2157 break; 2158 } 2159 } 2160 IN6_IFADDR_RUNLOCK(); 2161 2162 return (0); /* false */ 2163} 2164 2165/* 2166 * return length of part which dst and src are equal 2167 * hard coding... 2168 */ 2169int 2170in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 2171{ 2172 int match = 0; 2173 u_char *s = (u_char *)src, *d = (u_char *)dst; 2174 u_char *lim = s + 16, r; 2175 2176 while (s < lim) 2177 if ((r = (*d++ ^ *s++)) != 0) { 2178 while (r < 128) { 2179 match++; 2180 r <<= 1; 2181 } 2182 break; 2183 } else 2184 match += 8; 2185 return match; 2186} 2187 2188/* XXX: to be scope conscious */ 2189int 2190in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 2191{ 2192 int bytelen, bitlen; 2193 2194 /* sanity check */ 2195 if (0 > len || len > 128) { 2196 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 2197 len); 2198 return (0); 2199 } 2200 2201 bytelen = len / 8; 2202 bitlen = len % 8; 2203 2204 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 2205 return (0); 2206 if (bitlen != 0 && 2207 p1->s6_addr[bytelen] >> (8 - bitlen) != 2208 p2->s6_addr[bytelen] >> (8 - bitlen)) 2209 return (0); 2210 2211 return (1); 2212} 2213 2214void 2215in6_prefixlen2mask(struct in6_addr *maskp, int len) 2216{ 2217 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 2218 int bytelen, bitlen, i; 2219 2220 /* sanity check */ 2221 if (0 > len || len > 128) { 2222 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 2223 len); 2224 return; 2225 } 2226 2227 bzero(maskp, sizeof(*maskp)); 2228 bytelen = len / 8; 2229 bitlen = len % 8; 2230 for (i = 0; i < bytelen; i++) 2231 maskp->s6_addr[i] = 0xff; 2232 if (bitlen) 2233 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 2234} 2235 2236/* 2237 * return the best address out of the same scope. if no address was 2238 * found, return the first valid address from designated IF. 2239 */ 2240struct in6_ifaddr * 2241in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2242{ 2243 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2244 struct ifaddr *ifa; 2245 struct in6_ifaddr *besta = 0; 2246 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2247 2248 dep[0] = dep[1] = NULL; 2249 2250 /* 2251 * We first look for addresses in the same scope. 2252 * If there is one, return it. 2253 * If two or more, return one which matches the dst longest. 2254 * If none, return one of global addresses assigned other ifs. 2255 */ 2256 IF_ADDR_RLOCK(ifp); 2257 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2258 if (ifa->ifa_addr->sa_family != AF_INET6) 2259 continue; 2260 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2261 continue; /* XXX: is there any case to allow anycast? */ 2262 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2263 continue; /* don't use this interface */ 2264 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2265 continue; 2266 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2267 if (V_ip6_use_deprecated) 2268 dep[0] = (struct in6_ifaddr *)ifa; 2269 continue; 2270 } 2271 2272 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2273 /* 2274 * call in6_matchlen() as few as possible 2275 */ 2276 if (besta) { 2277 if (blen == -1) 2278 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2279 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2280 if (tlen > blen) { 2281 blen = tlen; 2282 besta = (struct in6_ifaddr *)ifa; 2283 } 2284 } else 2285 besta = (struct in6_ifaddr *)ifa; 2286 } 2287 } 2288 if (besta) { 2289 ifa_ref(&besta->ia_ifa); 2290 IF_ADDR_RUNLOCK(ifp); 2291 return (besta); 2292 } 2293 2294 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2295 if (ifa->ifa_addr->sa_family != AF_INET6) 2296 continue; 2297 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2298 continue; /* XXX: is there any case to allow anycast? */ 2299 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2300 continue; /* don't use this interface */ 2301 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2302 continue; 2303 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2304 if (V_ip6_use_deprecated) 2305 dep[1] = (struct in6_ifaddr *)ifa; 2306 continue; 2307 } 2308 2309 if (ifa != NULL) 2310 ifa_ref(ifa); 2311 IF_ADDR_RUNLOCK(ifp); 2312 return (struct in6_ifaddr *)ifa; 2313 } 2314 2315 /* use the last-resort values, that are, deprecated addresses */ 2316 if (dep[0]) { 2317 ifa_ref((struct ifaddr *)dep[0]); 2318 IF_ADDR_RUNLOCK(ifp); 2319 return dep[0]; 2320 } 2321 if (dep[1]) { 2322 ifa_ref((struct ifaddr *)dep[1]); 2323 IF_ADDR_RUNLOCK(ifp); 2324 return dep[1]; 2325 } 2326 2327 IF_ADDR_RUNLOCK(ifp); 2328 return NULL; 2329} 2330 2331/* 2332 * perform DAD when interface becomes IFF_UP. 2333 */ 2334void 2335in6_if_up(struct ifnet *ifp) 2336{ 2337 struct ifaddr *ifa; 2338 struct in6_ifaddr *ia; 2339 2340 IF_ADDR_RLOCK(ifp); 2341 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2342 if (ifa->ifa_addr->sa_family != AF_INET6) 2343 continue; 2344 ia = (struct in6_ifaddr *)ifa; 2345 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2346 /* 2347 * The TENTATIVE flag was likely set by hand 2348 * beforehand, implicitly indicating the need for DAD. 2349 * We may be able to skip the random delay in this 2350 * case, but we impose delays just in case. 2351 */ 2352 nd6_dad_start(ifa, 2353 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 2354 } 2355 } 2356 IF_ADDR_RUNLOCK(ifp); 2357 2358 /* 2359 * special cases, like 6to4, are handled in in6_ifattach 2360 */ 2361 in6_ifattach(ifp, NULL); 2362} 2363 2364int 2365in6if_do_dad(struct ifnet *ifp) 2366{ 2367 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 2368 return (0); 2369 2370 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 2371 return (0); 2372 2373 switch (ifp->if_type) { 2374#ifdef IFT_DUMMY 2375 case IFT_DUMMY: 2376#endif 2377 case IFT_FAITH: 2378 /* 2379 * These interfaces do not have the IFF_LOOPBACK flag, 2380 * but loop packets back. We do not have to do DAD on such 2381 * interfaces. We should even omit it, because loop-backed 2382 * NS would confuse the DAD procedure. 2383 */ 2384 return (0); 2385 default: 2386 /* 2387 * Our DAD routine requires the interface up and running. 2388 * However, some interfaces can be up before the RUNNING 2389 * status. Additionaly, users may try to assign addresses 2390 * before the interface becomes up (or running). 2391 * We simply skip DAD in such a case as a work around. 2392 * XXX: we should rather mark "tentative" on such addresses, 2393 * and do DAD after the interface becomes ready. 2394 */ 2395 if (!((ifp->if_flags & IFF_UP) && 2396 (ifp->if_drv_flags & IFF_DRV_RUNNING))) 2397 return (0); 2398 2399 return (1); 2400 } 2401} 2402 2403/* 2404 * Calculate max IPv6 MTU through all the interfaces and store it 2405 * to in6_maxmtu. 2406 */ 2407void 2408in6_setmaxmtu(void) 2409{ 2410 unsigned long maxmtu = 0; 2411 struct ifnet *ifp; 2412 2413 IFNET_RLOCK_NOSLEEP(); 2414 TAILQ_FOREACH(ifp, &V_ifnet, if_list) { 2415 /* this function can be called during ifnet initialization */ 2416 if (!ifp->if_afdata[AF_INET6]) 2417 continue; 2418 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2419 IN6_LINKMTU(ifp) > maxmtu) 2420 maxmtu = IN6_LINKMTU(ifp); 2421 } 2422 IFNET_RUNLOCK_NOSLEEP(); 2423 if (maxmtu) /* update only when maxmtu is positive */ 2424 V_in6_maxmtu = maxmtu; 2425} 2426 2427/* 2428 * Provide the length of interface identifiers to be used for the link attached 2429 * to the given interface. The length should be defined in "IPv6 over 2430 * xxx-link" document. Note that address architecture might also define 2431 * the length for a particular set of address prefixes, regardless of the 2432 * link type. As clarified in rfc2462bis, those two definitions should be 2433 * consistent, and those really are as of August 2004. 2434 */ 2435int 2436in6_if2idlen(struct ifnet *ifp) 2437{ 2438 switch (ifp->if_type) { 2439 case IFT_ETHER: /* RFC2464 */ 2440#ifdef IFT_PROPVIRTUAL 2441 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2442#endif 2443#ifdef IFT_L2VLAN 2444 case IFT_L2VLAN: /* ditto */ 2445#endif 2446#ifdef IFT_IEEE80211 2447 case IFT_IEEE80211: /* ditto */ 2448#endif 2449#ifdef IFT_MIP 2450 case IFT_MIP: /* ditto */ 2451#endif 2452 case IFT_INFINIBAND: 2453 return (64); 2454 case IFT_FDDI: /* RFC2467 */ 2455 return (64); 2456 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 2457 return (64); 2458 case IFT_PPP: /* RFC2472 */ 2459 return (64); 2460 case IFT_ARCNET: /* RFC2497 */ 2461 return (64); 2462 case IFT_FRELAY: /* RFC2590 */ 2463 return (64); 2464 case IFT_IEEE1394: /* RFC3146 */ 2465 return (64); 2466 case IFT_GIF: 2467 return (64); /* draft-ietf-v6ops-mech-v2-07 */ 2468 case IFT_LOOP: 2469 return (64); /* XXX: is this really correct? */ 2470 default: 2471 /* 2472 * Unknown link type: 2473 * It might be controversial to use the today's common constant 2474 * of 64 for these cases unconditionally. For full compliance, 2475 * we should return an error in this case. On the other hand, 2476 * if we simply miss the standard for the link type or a new 2477 * standard is defined for a new link type, the IFID length 2478 * is very likely to be the common constant. As a compromise, 2479 * we always use the constant, but make an explicit notice 2480 * indicating the "unknown" case. 2481 */ 2482 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2483 return (64); 2484 } 2485} 2486 2487#include <sys/sysctl.h> 2488 2489struct in6_llentry { 2490 struct llentry base; 2491 struct sockaddr_in6 l3_addr6; 2492}; 2493 2494/* 2495 * Deletes an address from the address table. 2496 * This function is called by the timer functions 2497 * such as arptimer() and nd6_llinfo_timer(), and 2498 * the caller does the locking. 2499 */ 2500static void 2501in6_lltable_free(struct lltable *llt, struct llentry *lle) 2502{ 2503 LLE_WUNLOCK(lle); 2504 LLE_LOCK_DESTROY(lle); 2505 free(lle, M_LLTABLE); 2506} 2507 2508static struct llentry * 2509in6_lltable_new(const struct sockaddr *l3addr, u_int flags) 2510{ 2511 struct in6_llentry *lle; 2512 2513 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 2514 if (lle == NULL) /* NB: caller generates msg */ 2515 return NULL; 2516 2517 lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr; 2518 lle->base.lle_refcnt = 1; 2519 lle->base.lle_free = in6_lltable_free; 2520 LLE_LOCK_INIT(&lle->base); 2521 callout_init_rw(&lle->base.ln_timer_ch, &lle->base.lle_lock, 2522 CALLOUT_RETURNUNLOCKED); 2523 2524 return (&lle->base); 2525} 2526 2527static void 2528in6_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix, 2529 const struct sockaddr *mask, u_int flags) 2530{ 2531 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix; 2532 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask; 2533 struct llentry *lle, *next; 2534 int i; 2535 2536 /* 2537 * (flags & LLE_STATIC) means deleting all entries 2538 * including static ND6 entries. 2539 */ 2540 IF_AFDATA_WLOCK(llt->llt_ifp); 2541 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 2542 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 2543 if (IN6_ARE_MASKED_ADDR_EQUAL( 2544 &satosin6(L3_ADDR(lle))->sin6_addr, 2545 &pfx->sin6_addr, &msk->sin6_addr) && 2546 ((flags & LLE_STATIC) || 2547 !(lle->la_flags & LLE_STATIC))) { 2548 LLE_WLOCK(lle); 2549 if (callout_stop(&lle->la_timer)) 2550 LLE_REMREF(lle); 2551 llentry_free(lle); 2552 } 2553 } 2554 } 2555 IF_AFDATA_WUNLOCK(llt->llt_ifp); 2556} 2557 2558static int 2559in6_lltable_rtcheck(struct ifnet *ifp, 2560 u_int flags, 2561 const struct sockaddr *l3addr) 2562{ 2563 struct rtentry *rt; 2564 char ip6buf[INET6_ADDRSTRLEN]; 2565 2566 KASSERT(l3addr->sa_family == AF_INET6, 2567 ("sin_family %d", l3addr->sa_family)); 2568 2569 /* Our local addresses are always only installed on the default FIB. */ 2570 /* XXX rtalloc1 should take a const param */ 2571 rt = in6_rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0, 2572 RT_DEFAULT_FIB); 2573 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 2574 struct ifaddr *ifa; 2575 /* 2576 * Create an ND6 cache for an IPv6 neighbor 2577 * that is not covered by our own prefix. 2578 */ 2579 /* XXX ifaof_ifpforaddr should take a const param */ 2580 ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp); 2581 if (ifa != NULL) { 2582 ifa_free(ifa); 2583 if (rt != NULL) 2584 RTFREE_LOCKED(rt); 2585 return 0; 2586 } 2587 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2588 ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr)); 2589 if (rt != NULL) 2590 RTFREE_LOCKED(rt); 2591 return EINVAL; 2592 } 2593 RTFREE_LOCKED(rt); 2594 return 0; 2595} 2596 2597static struct llentry * 2598in6_lltable_lookup(struct lltable *llt, u_int flags, 2599 const struct sockaddr *l3addr) 2600{ 2601 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2602 struct ifnet *ifp = llt->llt_ifp; 2603 struct llentry *lle; 2604 struct llentries *lleh; 2605 u_int hashkey; 2606 2607 IF_AFDATA_LOCK_ASSERT(ifp); 2608 KASSERT(l3addr->sa_family == AF_INET6, 2609 ("sin_family %d", l3addr->sa_family)); 2610 2611 hashkey = sin6->sin6_addr.s6_addr32[3]; 2612 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 2613 LIST_FOREACH(lle, lleh, lle_next) { 2614 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle); 2615 if (lle->la_flags & LLE_DELETED) 2616 continue; 2617 if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr, 2618 sizeof(struct in6_addr)) == 0) 2619 break; 2620 } 2621 2622 if (lle == NULL) { 2623 if (!(flags & LLE_CREATE)) 2624 return (NULL); 2625 IF_AFDATA_WLOCK_ASSERT(ifp); 2626 /* 2627 * A route that covers the given address must have 2628 * been installed 1st because we are doing a resolution, 2629 * verify this. 2630 */ 2631 if (!(flags & LLE_IFADDR) && 2632 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2633 return NULL; 2634 2635 lle = in6_lltable_new(l3addr, flags); 2636 if (lle == NULL) { 2637 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2638 return NULL; 2639 } 2640 lle->la_flags = flags & ~LLE_CREATE; 2641 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 2642 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 2643 lle->la_flags |= (LLE_VALID | LLE_STATIC); 2644 } 2645 2646 lle->lle_tbl = llt; 2647 lle->lle_head = lleh; 2648 lle->la_flags |= LLE_LINKED; 2649 LIST_INSERT_HEAD(lleh, lle, lle_next); 2650 } else if (flags & LLE_DELETE) { 2651 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 2652 LLE_WLOCK(lle); 2653 lle->la_flags |= LLE_DELETED; 2654#ifdef DIAGNOSTIC 2655 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2656#endif 2657 if ((lle->la_flags & 2658 (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC) 2659 llentry_free(lle); 2660 else 2661 LLE_WUNLOCK(lle); 2662 } 2663 lle = (void *)-1; 2664 } 2665 if (LLE_IS_VALID(lle)) { 2666 if (flags & LLE_EXCLUSIVE) 2667 LLE_WLOCK(lle); 2668 else 2669 LLE_RLOCK(lle); 2670 } 2671 return (lle); 2672} 2673 2674static int 2675in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 2676{ 2677 struct ifnet *ifp = llt->llt_ifp; 2678 struct llentry *lle; 2679 /* XXX stack use */ 2680 struct { 2681 struct rt_msghdr rtm; 2682 struct sockaddr_in6 sin6; 2683 /* 2684 * ndp.c assumes that sdl is word aligned 2685 */ 2686#ifdef __LP64__ 2687 uint32_t pad; 2688#endif 2689 struct sockaddr_dl sdl; 2690 } ndpc; 2691 int i, error; 2692 2693 if (ifp->if_flags & IFF_LOOPBACK) 2694 return 0; 2695 2696 LLTABLE_LOCK_ASSERT(); 2697 2698 error = 0; 2699 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 2700 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 2701 struct sockaddr_dl *sdl; 2702 2703 /* skip deleted or invalid entries */ 2704 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID) 2705 continue; 2706 /* Skip if jailed and not a valid IP of the prison. */ 2707 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 2708 continue; 2709 /* 2710 * produce a msg made of: 2711 * struct rt_msghdr; 2712 * struct sockaddr_in6 (IPv6) 2713 * struct sockaddr_dl; 2714 */ 2715 bzero(&ndpc, sizeof(ndpc)); 2716 ndpc.rtm.rtm_msglen = sizeof(ndpc); 2717 ndpc.rtm.rtm_version = RTM_VERSION; 2718 ndpc.rtm.rtm_type = RTM_GET; 2719 ndpc.rtm.rtm_flags = RTF_UP; 2720 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 2721 ndpc.sin6.sin6_family = AF_INET6; 2722 ndpc.sin6.sin6_len = sizeof(ndpc.sin6); 2723 bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle)); 2724 if (V_deembed_scopeid) 2725 sa6_recoverscope(&ndpc.sin6); 2726 2727 /* publish */ 2728 if (lle->la_flags & LLE_PUB) 2729 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE; 2730 2731 sdl = &ndpc.sdl; 2732 sdl->sdl_family = AF_LINK; 2733 sdl->sdl_len = sizeof(*sdl); 2734 sdl->sdl_alen = ifp->if_addrlen; 2735 sdl->sdl_index = ifp->if_index; 2736 sdl->sdl_type = ifp->if_type; 2737 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 2738 ndpc.rtm.rtm_rmx.rmx_expire = 2739 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 2740 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 2741 if (lle->la_flags & LLE_STATIC) 2742 ndpc.rtm.rtm_flags |= RTF_STATIC; 2743 ndpc.rtm.rtm_index = ifp->if_index; 2744 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc)); 2745 if (error) 2746 break; 2747 } 2748 } 2749 return error; 2750} 2751 2752void * 2753in6_domifattach(struct ifnet *ifp) 2754{ 2755 struct in6_ifextra *ext; 2756 2757 /* There are not IPv6-capable interfaces. */ 2758 switch (ifp->if_type) { 2759 case IFT_PFLOG: 2760 case IFT_PFSYNC: 2761 case IFT_USB: 2762 return (NULL); 2763 } 2764 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2765 bzero(ext, sizeof(*ext)); 2766 2767 ext->in6_ifstat = malloc(sizeof(counter_u64_t) * 2768 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK); 2769 COUNTER_ARRAY_ALLOC(ext->in6_ifstat, 2770 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK); 2771 2772 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) * 2773 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR, 2774 M_WAITOK); 2775 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat, 2776 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK); 2777 2778 ext->nd_ifinfo = nd6_ifattach(ifp); 2779 ext->scope6_id = scope6_ifattach(ifp); 2780 ext->lltable = lltable_init(ifp, AF_INET6); 2781 if (ext->lltable != NULL) { 2782 ext->lltable->llt_prefix_free = in6_lltable_prefix_free; 2783 ext->lltable->llt_lookup = in6_lltable_lookup; 2784 ext->lltable->llt_dump = in6_lltable_dump; 2785 } 2786 2787 ext->mld_ifinfo = mld_domifattach(ifp); 2788 2789 return ext; 2790} 2791 2792void 2793in6_domifdetach(struct ifnet *ifp, void *aux) 2794{ 2795 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2796 2797 mld_domifdetach(ifp); 2798 scope6_ifdetach(ext->scope6_id); 2799 nd6_ifdetach(ext->nd_ifinfo); 2800 lltable_free(ext->lltable); 2801 COUNTER_ARRAY_FREE(ext->in6_ifstat, 2802 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 2803 free(ext->in6_ifstat, M_IFADDR); 2804 COUNTER_ARRAY_FREE(ext->icmp6_ifstat, 2805 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 2806 free(ext->icmp6_ifstat, M_IFADDR); 2807 free(ext, M_IFADDR); 2808} 2809 2810/* 2811 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2812 * v4 mapped addr or v4 compat addr 2813 */ 2814void 2815in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2816{ 2817 2818 bzero(sin, sizeof(*sin)); 2819 sin->sin_len = sizeof(struct sockaddr_in); 2820 sin->sin_family = AF_INET; 2821 sin->sin_port = sin6->sin6_port; 2822 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2823} 2824 2825/* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2826void 2827in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2828{ 2829 bzero(sin6, sizeof(*sin6)); 2830 sin6->sin6_len = sizeof(struct sockaddr_in6); 2831 sin6->sin6_family = AF_INET6; 2832 sin6->sin6_port = sin->sin_port; 2833 sin6->sin6_addr.s6_addr32[0] = 0; 2834 sin6->sin6_addr.s6_addr32[1] = 0; 2835 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2836 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2837} 2838 2839/* Convert sockaddr_in6 into sockaddr_in. */ 2840void 2841in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2842{ 2843 struct sockaddr_in *sin_p; 2844 struct sockaddr_in6 sin6; 2845 2846 /* 2847 * Save original sockaddr_in6 addr and convert it 2848 * to sockaddr_in. 2849 */ 2850 sin6 = *(struct sockaddr_in6 *)nam; 2851 sin_p = (struct sockaddr_in *)nam; 2852 in6_sin6_2_sin(sin_p, &sin6); 2853} 2854 2855/* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2856void 2857in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2858{ 2859 struct sockaddr_in *sin_p; 2860 struct sockaddr_in6 *sin6_p; 2861 2862 sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK); 2863 sin_p = (struct sockaddr_in *)*nam; 2864 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2865 free(*nam, M_SONAME); 2866 *nam = (struct sockaddr *)sin6_p; 2867} 2868