in6.c revision 288109
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 288109 2015-09-22 14:33:43Z garga $"); 65 66#include "opt_compat.h" 67#include "opt_inet.h" 68#include "opt_inet6.h" 69 70#include <sys/param.h> 71#include <sys/errno.h> 72#include <sys/jail.h> 73#include <sys/malloc.h> 74#include <sys/socket.h> 75#include <sys/socketvar.h> 76#include <sys/sockio.h> 77#include <sys/systm.h> 78#include <sys/priv.h> 79#include <sys/proc.h> 80#include <sys/time.h> 81#include <sys/kernel.h> 82#include <sys/syslog.h> 83 84#include <net/if.h> 85#include <net/if_var.h> 86#include <net/if_types.h> 87#include <net/route.h> 88#include <net/if_dl.h> 89#include <net/vnet.h> 90 91#include <netinet/in.h> 92#include <netinet/in_var.h> 93#include <net/if_llatbl.h> 94#include <netinet/if_ether.h> 95#include <netinet/in_systm.h> 96#include <netinet/ip.h> 97#include <netinet/in_pcb.h> 98#include <netinet/ip_carp.h> 99 100#include <netinet/ip6.h> 101#include <netinet6/ip6_var.h> 102#include <netinet6/nd6.h> 103#include <netinet6/mld6_var.h> 104#include <netinet6/ip6_mroute.h> 105#include <netinet6/in6_ifattach.h> 106#include <netinet6/scope6_var.h> 107#include <netinet6/in6_pcb.h> 108 109VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix); 110#define V_icmp6_nodeinfo_oldmcprefix VNET(icmp6_nodeinfo_oldmcprefix) 111 112/* 113 * Definitions of some costant IP6 addresses. 114 */ 115const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 116const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 117const struct in6_addr in6addr_nodelocal_allnodes = 118 IN6ADDR_NODELOCAL_ALLNODES_INIT; 119const struct in6_addr in6addr_linklocal_allnodes = 120 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 121const struct in6_addr in6addr_linklocal_allrouters = 122 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 123const struct in6_addr in6addr_linklocal_allv2routers = 124 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT; 125 126const struct in6_addr in6mask0 = IN6MASK0; 127const struct in6_addr in6mask32 = IN6MASK32; 128const struct in6_addr in6mask64 = IN6MASK64; 129const struct in6_addr in6mask96 = IN6MASK96; 130const struct in6_addr in6mask128 = IN6MASK128; 131 132const struct sockaddr_in6 sa6_any = 133 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 }; 134 135static int in6_lifaddr_ioctl(struct socket *, u_long, caddr_t, 136 struct ifnet *, struct thread *); 137static int in6_ifinit(struct ifnet *, struct in6_ifaddr *, 138 struct sockaddr_in6 *, int); 139static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 140 141int (*faithprefix_p)(struct in6_addr *); 142 143#define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 144#define ia62ifa(ia6) (&((ia6)->ia_ifa)) 145 146void 147in6_ifaddloop(struct ifaddr *ifa) 148{ 149 struct sockaddr_dl gateway; 150 struct sockaddr_in6 mask, addr; 151 struct rtentry rt; 152 struct in6_ifaddr *ia; 153 struct ifnet *ifp; 154 struct llentry *ln; 155 156 ia = ifa2ia6(ifa); 157 ifp = ifa->ifa_ifp; 158 /* 159 * initialize for rtmsg generation 160 */ 161 bzero(&gateway, sizeof(gateway)); 162 gateway.sdl_len = sizeof(gateway); 163 gateway.sdl_family = AF_LINK; 164 if (nd6_need_cache(ifp) != 0) { 165 IF_AFDATA_LOCK(ifp); 166 ifa->ifa_rtrequest = nd6_rtrequest; 167 ln = lla_lookup(LLTABLE6(ifp), (LLE_CREATE | LLE_IFADDR | 168 LLE_EXCLUSIVE), (struct sockaddr *)&ia->ia_addr); 169 IF_AFDATA_UNLOCK(ifp); 170 if (ln != NULL) { 171 ln->la_expire = 0; /* for IPv6 this means permanent */ 172 ln->ln_state = ND6_LLINFO_REACHABLE; 173 174 gateway.sdl_alen = 6; 175 memcpy(gateway.sdl_data, &ln->ll_addr.mac_aligned, 176 sizeof(ln->ll_addr)); 177 LLE_WUNLOCK(ln); 178 } 179 } 180 bzero(&rt, sizeof(rt)); 181 rt.rt_gateway = (struct sockaddr *)&gateway; 182 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 183 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr)); 184 rt_mask(&rt) = (struct sockaddr *)&mask; 185 rt_key(&rt) = (struct sockaddr *)&addr; 186 rt.rt_flags = RTF_UP | RTF_HOST | RTF_STATIC; 187 /* Announce arrival of local address to all FIBs. */ 188 rt_newaddrmsg(RTM_ADD, ifa, 0, &rt); 189} 190 191void 192in6_ifremloop(struct ifaddr *ifa) 193{ 194 struct sockaddr_dl gateway; 195 struct sockaddr_in6 mask, addr; 196 struct rtentry rt0; 197 struct in6_ifaddr *ia; 198 struct ifnet *ifp; 199 200 ia = ifa2ia6(ifa); 201 ifp = ifa->ifa_ifp; 202 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr)); 203 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 204 lltable_prefix_free(AF_INET6, (struct sockaddr *)&addr, 205 (struct sockaddr *)&mask, LLE_STATIC); 206 207 /* 208 * initialize for rtmsg generation 209 */ 210 bzero(&gateway, sizeof(gateway)); 211 gateway.sdl_len = sizeof(gateway); 212 gateway.sdl_family = AF_LINK; 213 gateway.sdl_nlen = 0; 214 gateway.sdl_alen = ifp->if_addrlen; 215 bzero(&rt0, sizeof(rt0)); 216 rt0.rt_gateway = (struct sockaddr *)&gateway; 217 rt_mask(&rt0) = (struct sockaddr *)&mask; 218 rt_key(&rt0) = (struct sockaddr *)&addr; 219 rt0.rt_flags = RTF_HOST | RTF_STATIC; 220 /* Announce removal of local address to all FIBs. */ 221 rt_newaddrmsg(RTM_DELETE, ifa, 0, &rt0); 222} 223 224int 225in6_mask2len(struct in6_addr *mask, u_char *lim0) 226{ 227 int x = 0, y; 228 u_char *lim = lim0, *p; 229 230 /* ignore the scope_id part */ 231 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 232 lim = (u_char *)mask + sizeof(*mask); 233 for (p = (u_char *)mask; p < lim; x++, p++) { 234 if (*p != 0xff) 235 break; 236 } 237 y = 0; 238 if (p < lim) { 239 for (y = 0; y < 8; y++) { 240 if ((*p & (0x80 >> y)) == 0) 241 break; 242 } 243 } 244 245 /* 246 * when the limit pointer is given, do a stricter check on the 247 * remaining bits. 248 */ 249 if (p < lim) { 250 if (y != 0 && (*p & (0x00ff >> y)) != 0) 251 return (-1); 252 for (p = p + 1; p < lim; p++) 253 if (*p != 0) 254 return (-1); 255 } 256 257 return x * 8 + y; 258} 259 260#ifdef COMPAT_FREEBSD32 261struct in6_ndifreq32 { 262 char ifname[IFNAMSIZ]; 263 uint32_t ifindex; 264}; 265#define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32) 266#endif 267 268int 269in6_control(struct socket *so, u_long cmd, caddr_t data, 270 struct ifnet *ifp, struct thread *td) 271{ 272 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 273 struct in6_ifaddr *ia = NULL; 274 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 275 struct sockaddr_in6 *sa6; 276 int carp_attached = 0; 277 int error; 278 u_long ocmd = cmd; 279 280 /* 281 * Compat to make pre-10.x ifconfig(8) operable. 282 */ 283 if (cmd == OSIOCAIFADDR_IN6) 284 cmd = SIOCAIFADDR_IN6; 285 286 switch (cmd) { 287 case SIOCGETSGCNT_IN6: 288 case SIOCGETMIFCNT_IN6: 289 /* 290 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c. 291 * We cannot see how that would be needed, so do not adjust the 292 * KPI blindly; more likely should clean up the IPv4 variant. 293 */ 294 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP); 295 } 296 297 switch (cmd) { 298 case SIOCAADDRCTL_POLICY: 299 case SIOCDADDRCTL_POLICY: 300 if (td != NULL) { 301 error = priv_check(td, PRIV_NETINET_ADDRCTRL6); 302 if (error) 303 return (error); 304 } 305 return (in6_src_ioctl(cmd, data)); 306 } 307 308 if (ifp == NULL) 309 return (EOPNOTSUPP); 310 311 switch (cmd) { 312 case SIOCSNDFLUSH_IN6: 313 case SIOCSPFXFLUSH_IN6: 314 case SIOCSRTRFLUSH_IN6: 315 case SIOCSDEFIFACE_IN6: 316 case SIOCSIFINFO_FLAGS: 317 case SIOCSIFINFO_IN6: 318 if (td != NULL) { 319 error = priv_check(td, PRIV_NETINET_ND6); 320 if (error) 321 return (error); 322 } 323 /* FALLTHROUGH */ 324 case OSIOCGIFINFO_IN6: 325 case SIOCGIFINFO_IN6: 326 case SIOCGNBRINFO_IN6: 327 case SIOCGDEFIFACE_IN6: 328 return (nd6_ioctl(cmd, data, ifp)); 329 330#ifdef COMPAT_FREEBSD32 331 case SIOCGDEFIFACE32_IN6: 332 { 333 struct in6_ndifreq ndif; 334 struct in6_ndifreq32 *ndif32; 335 336 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif, 337 ifp); 338 if (error) 339 return (error); 340 ndif32 = (struct in6_ndifreq32 *)data; 341 ndif32->ifindex = ndif.ifindex; 342 return (0); 343 } 344#endif 345 } 346 347 switch (cmd) { 348 case SIOCSIFPREFIX_IN6: 349 case SIOCDIFPREFIX_IN6: 350 case SIOCAIFPREFIX_IN6: 351 case SIOCCIFPREFIX_IN6: 352 case SIOCSGIFPREFIX_IN6: 353 case SIOCGIFPREFIX_IN6: 354 log(LOG_NOTICE, 355 "prefix ioctls are now invalidated. " 356 "please use ifconfig.\n"); 357 return (EOPNOTSUPP); 358 } 359 360 switch (cmd) { 361 case SIOCSSCOPE6: 362 if (td != NULL) { 363 error = priv_check(td, PRIV_NETINET_SCOPE6); 364 if (error) 365 return (error); 366 } 367 /* FALLTHROUGH */ 368 case SIOCGSCOPE6: 369 case SIOCGSCOPE6DEF: 370 return (scope6_ioctl(cmd, data, ifp)); 371 } 372 373 switch (cmd) { 374 case SIOCALIFADDR: 375 if (td != NULL) { 376 error = priv_check(td, PRIV_NET_ADDIFADDR); 377 if (error) 378 return (error); 379 } 380 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 381 382 case SIOCDLIFADDR: 383 if (td != NULL) { 384 error = priv_check(td, PRIV_NET_DELIFADDR); 385 if (error) 386 return (error); 387 } 388 /* FALLTHROUGH */ 389 case SIOCGLIFADDR: 390 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 391 } 392 393 /* 394 * Find address for this interface, if it exists. 395 * 396 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 397 * only, and used the first interface address as the target of other 398 * operations (without checking ifra_addr). This was because netinet 399 * code/API assumed at most 1 interface address per interface. 400 * Since IPv6 allows a node to assign multiple addresses 401 * on a single interface, we almost always look and check the 402 * presence of ifra_addr, and reject invalid ones here. 403 * It also decreases duplicated code among SIOC*_IN6 operations. 404 */ 405 switch (cmd) { 406 case SIOCAIFADDR_IN6: 407 case SIOCSIFPHYADDR_IN6: 408 sa6 = &ifra->ifra_addr; 409 break; 410 case SIOCSIFADDR_IN6: 411 case SIOCGIFADDR_IN6: 412 case SIOCSIFDSTADDR_IN6: 413 case SIOCSIFNETMASK_IN6: 414 case SIOCGIFDSTADDR_IN6: 415 case SIOCGIFNETMASK_IN6: 416 case SIOCDIFADDR_IN6: 417 case SIOCGIFPSRCADDR_IN6: 418 case SIOCGIFPDSTADDR_IN6: 419 case SIOCGIFAFLAG_IN6: 420 case SIOCSNDFLUSH_IN6: 421 case SIOCSPFXFLUSH_IN6: 422 case SIOCSRTRFLUSH_IN6: 423 case SIOCGIFALIFETIME_IN6: 424 case SIOCSIFALIFETIME_IN6: 425 case SIOCGIFSTAT_IN6: 426 case SIOCGIFSTAT_ICMP6: 427 sa6 = &ifr->ifr_addr; 428 break; 429 case SIOCSIFADDR: 430 case SIOCSIFBRDADDR: 431 case SIOCSIFDSTADDR: 432 case SIOCSIFNETMASK: 433 /* 434 * Although we should pass any non-INET6 ioctl requests 435 * down to driver, we filter some legacy INET requests. 436 * Drivers trust SIOCSIFADDR et al to come from an already 437 * privileged layer, and do not perform any credentials 438 * checks or input validation. 439 */ 440 return (EINVAL); 441 default: 442 sa6 = NULL; 443 break; 444 } 445 if (sa6 && sa6->sin6_family == AF_INET6) { 446 if (sa6->sin6_scope_id != 0) 447 error = sa6_embedscope(sa6, 0); 448 else 449 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 450 if (error != 0) 451 return (error); 452 if (td != NULL && (error = prison_check_ip6(td->td_ucred, 453 &sa6->sin6_addr)) != 0) 454 return (error); 455 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 456 } else 457 ia = NULL; 458 459 switch (cmd) { 460 case SIOCSIFADDR_IN6: 461 case SIOCSIFDSTADDR_IN6: 462 case SIOCSIFNETMASK_IN6: 463 /* 464 * Since IPv6 allows a node to assign multiple addresses 465 * on a single interface, SIOCSIFxxx ioctls are deprecated. 466 */ 467 /* we decided to obsolete this command (20000704) */ 468 error = EINVAL; 469 goto out; 470 471 case SIOCDIFADDR_IN6: 472 /* 473 * for IPv4, we look for existing in_ifaddr here to allow 474 * "ifconfig if0 delete" to remove the first IPv4 address on 475 * the interface. For IPv6, as the spec allows multiple 476 * interface address from the day one, we consider "remove the 477 * first one" semantics to be not preferable. 478 */ 479 if (ia == NULL) { 480 error = EADDRNOTAVAIL; 481 goto out; 482 } 483 /* FALLTHROUGH */ 484 case SIOCAIFADDR_IN6: 485 /* 486 * We always require users to specify a valid IPv6 address for 487 * the corresponding operation. 488 */ 489 if (ifra->ifra_addr.sin6_family != AF_INET6 || 490 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 491 error = EAFNOSUPPORT; 492 goto out; 493 } 494 495 if (td != NULL) { 496 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 497 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR); 498 if (error) 499 goto out; 500 } 501 /* FALLTHROUGH */ 502 case SIOCGIFSTAT_IN6: 503 case SIOCGIFSTAT_ICMP6: 504 if (ifp->if_afdata[AF_INET6] == NULL) { 505 error = EPFNOSUPPORT; 506 goto out; 507 } 508 break; 509 510 case SIOCGIFADDR_IN6: 511 /* This interface is basically deprecated. use SIOCGIFCONF. */ 512 /* FALLTHROUGH */ 513 case SIOCGIFAFLAG_IN6: 514 case SIOCGIFNETMASK_IN6: 515 case SIOCGIFDSTADDR_IN6: 516 case SIOCGIFALIFETIME_IN6: 517 /* must think again about its semantics */ 518 if (ia == NULL) { 519 error = EADDRNOTAVAIL; 520 goto out; 521 } 522 break; 523 524 case SIOCSIFALIFETIME_IN6: 525 { 526 struct in6_addrlifetime *lt; 527 528 if (td != NULL) { 529 error = priv_check(td, PRIV_NETINET_ALIFETIME6); 530 if (error) 531 goto out; 532 } 533 if (ia == NULL) { 534 error = EADDRNOTAVAIL; 535 goto out; 536 } 537 /* sanity for overflow - beware unsigned */ 538 lt = &ifr->ifr_ifru.ifru_lifetime; 539 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME && 540 lt->ia6t_vltime + time_uptime < time_uptime) { 541 error = EINVAL; 542 goto out; 543 } 544 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME && 545 lt->ia6t_pltime + time_uptime < time_uptime) { 546 error = EINVAL; 547 goto out; 548 } 549 break; 550 } 551 } 552 553 switch (cmd) { 554 case SIOCGIFADDR_IN6: 555 ifr->ifr_addr = ia->ia_addr; 556 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 557 goto out; 558 break; 559 560 case SIOCGIFDSTADDR_IN6: 561 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 562 error = EINVAL; 563 goto out; 564 } 565 /* 566 * XXX: should we check if ifa_dstaddr is NULL and return 567 * an error? 568 */ 569 ifr->ifr_dstaddr = ia->ia_dstaddr; 570 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 571 goto out; 572 break; 573 574 case SIOCGIFNETMASK_IN6: 575 ifr->ifr_addr = ia->ia_prefixmask; 576 break; 577 578 case SIOCGIFAFLAG_IN6: 579 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 580 break; 581 582 case SIOCGIFSTAT_IN6: 583 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 584 ifp->if_afdata[AF_INET6])->in6_ifstat, 585 &ifr->ifr_ifru.ifru_stat, 586 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 587 break; 588 589 case SIOCGIFSTAT_ICMP6: 590 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 591 ifp->if_afdata[AF_INET6])->icmp6_ifstat, 592 &ifr->ifr_ifru.ifru_icmp6stat, 593 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 594 break; 595 596 case SIOCGIFALIFETIME_IN6: 597 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 598 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 599 time_t maxexpire; 600 struct in6_addrlifetime *retlt = 601 &ifr->ifr_ifru.ifru_lifetime; 602 603 /* 604 * XXX: adjust expiration time assuming time_t is 605 * signed. 606 */ 607 maxexpire = (-1) & 608 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 609 if (ia->ia6_lifetime.ia6t_vltime < 610 maxexpire - ia->ia6_updatetime) { 611 retlt->ia6t_expire = ia->ia6_updatetime + 612 ia->ia6_lifetime.ia6t_vltime; 613 } else 614 retlt->ia6t_expire = maxexpire; 615 } 616 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 617 time_t maxexpire; 618 struct in6_addrlifetime *retlt = 619 &ifr->ifr_ifru.ifru_lifetime; 620 621 /* 622 * XXX: adjust expiration time assuming time_t is 623 * signed. 624 */ 625 maxexpire = (-1) & 626 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 627 if (ia->ia6_lifetime.ia6t_pltime < 628 maxexpire - ia->ia6_updatetime) { 629 retlt->ia6t_preferred = ia->ia6_updatetime + 630 ia->ia6_lifetime.ia6t_pltime; 631 } else 632 retlt->ia6t_preferred = maxexpire; 633 } 634 break; 635 636 case SIOCSIFALIFETIME_IN6: 637 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; 638 /* for sanity */ 639 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 640 ia->ia6_lifetime.ia6t_expire = 641 time_uptime + ia->ia6_lifetime.ia6t_vltime; 642 } else 643 ia->ia6_lifetime.ia6t_expire = 0; 644 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 645 ia->ia6_lifetime.ia6t_preferred = 646 time_uptime + ia->ia6_lifetime.ia6t_pltime; 647 } else 648 ia->ia6_lifetime.ia6t_preferred = 0; 649 break; 650 651 case SIOCAIFADDR_IN6: 652 { 653 int i; 654 struct nd_prefixctl pr0; 655 struct nd_prefix *pr; 656 657 /* 658 * first, make or update the interface address structure, 659 * and link it to the list. 660 */ 661 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 662 goto out; 663 if (ia != NULL) 664 ifa_free(&ia->ia_ifa); 665 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 666 == NULL) { 667 /* 668 * this can happen when the user specify the 0 valid 669 * lifetime. 670 */ 671 break; 672 } 673 674 if (cmd == ocmd && ifra->ifra_vhid > 0) { 675 if (carp_attach_p != NULL) 676 error = (*carp_attach_p)(&ia->ia_ifa, 677 ifra->ifra_vhid); 678 else 679 error = EPROTONOSUPPORT; 680 if (error) 681 goto out; 682 else 683 carp_attached = 1; 684 } 685 686 /* 687 * then, make the prefix on-link on the interface. 688 * XXX: we'd rather create the prefix before the address, but 689 * we need at least one address to install the corresponding 690 * interface route, so we configure the address first. 691 */ 692 693 /* 694 * convert mask to prefix length (prefixmask has already 695 * been validated in in6_update_ifa(). 696 */ 697 bzero(&pr0, sizeof(pr0)); 698 pr0.ndpr_ifp = ifp; 699 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 700 NULL); 701 if (pr0.ndpr_plen == 128) { 702 /* we don't need to install a host route. */ 703 goto aifaddr_out; 704 } 705 pr0.ndpr_prefix = ifra->ifra_addr; 706 /* apply the mask for safety. */ 707 for (i = 0; i < 4; i++) { 708 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 709 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i]; 710 } 711 /* 712 * XXX: since we don't have an API to set prefix (not address) 713 * lifetimes, we just use the same lifetimes as addresses. 714 * The (temporarily) installed lifetimes can be overridden by 715 * later advertised RAs (when accept_rtadv is non 0), which is 716 * an intended behavior. 717 */ 718 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 719 pr0.ndpr_raf_auto = 720 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 721 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 722 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 723 724 /* add the prefix if not yet. */ 725 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 726 /* 727 * nd6_prelist_add will install the corresponding 728 * interface route. 729 */ 730 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) { 731 if (carp_attached) 732 (*carp_detach_p)(&ia->ia_ifa); 733 goto out; 734 } 735 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(); 771aifaddr_out: 772 if (error != 0 || ia == NULL) 773 break; 774 /* 775 * Try to clear the flag when a new IPv6 address is added 776 * onto an IFDISABLED interface and it succeeds. 777 */ 778 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) { 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, (caddr_t)&nd, ifp) < 0) 785 log(LOG_NOTICE, "SIOCAIFADDR_IN6: " 786 "SIOCSIFINFO_FLAGS for -ifdisabled " 787 "failed."); 788 /* 789 * Ignore failure of clearing the flag intentionally. 790 * The failure means address duplication was detected. 791 */ 792 } 793 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 794 break; 795 } 796 797 case SIOCDIFADDR_IN6: 798 { 799 struct nd_prefix *pr; 800 801 /* 802 * If the address being deleted is the only one that owns 803 * the corresponding prefix, expire the prefix as well. 804 * XXX: theoretically, we don't have to worry about such 805 * relationship, since we separate the address management 806 * and the prefix management. We do this, however, to provide 807 * as much backward compatibility as possible in terms of 808 * the ioctl operation. 809 * Note that in6_purgeaddr() will decrement ndpr_refcnt. 810 */ 811 pr = ia->ia6_ndpr; 812 in6_purgeaddr(&ia->ia_ifa); 813 if (pr && pr->ndpr_refcnt == 0) 814 prelist_remove(pr); 815 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 816 break; 817 } 818 819 default: 820 if (ifp->if_ioctl == NULL) { 821 error = EOPNOTSUPP; 822 goto out; 823 } 824 error = (*ifp->if_ioctl)(ifp, cmd, data); 825 goto out; 826 } 827 828 error = 0; 829out: 830 if (ia != NULL) 831 ifa_free(&ia->ia_ifa); 832 return (error); 833} 834 835 836/* 837 * Join necessary multicast groups. Factored out from in6_update_ifa(). 838 * This entire work should only be done once, for the default FIB. 839 */ 840static int 841in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra, 842 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol) 843{ 844 char ip6buf[INET6_ADDRSTRLEN]; 845 struct sockaddr_in6 mltaddr, mltmask; 846 struct in6_addr llsol; 847 struct in6_multi_mship *imm; 848 struct rtentry *rt; 849 int delay, error; 850 851 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__)); 852 853 /* Join solicited multicast addr for new host id. */ 854 bzero(&llsol, sizeof(struct in6_addr)); 855 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL; 856 llsol.s6_addr32[1] = 0; 857 llsol.s6_addr32[2] = htonl(1); 858 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 859 llsol.s6_addr8[12] = 0xff; 860 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) { 861 /* XXX: should not happen */ 862 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 863 goto cleanup; 864 } 865 delay = 0; 866 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 867 /* 868 * We need a random delay for DAD on the address being 869 * configured. It also means delaying transmission of the 870 * corresponding MLD report to avoid report collision. 871 * [RFC 4861, Section 6.3.7] 872 */ 873 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 874 } 875 imm = in6_joingroup(ifp, &llsol, &error, delay); 876 if (imm == NULL) { 877 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 878 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &llsol), 879 if_name(ifp), error)); 880 goto cleanup; 881 } 882 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 883 *in6m_sol = imm->i6mm_maddr; 884 885 bzero(&mltmask, sizeof(mltmask)); 886 mltmask.sin6_len = sizeof(struct sockaddr_in6); 887 mltmask.sin6_family = AF_INET6; 888 mltmask.sin6_addr = in6mask32; 889#define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */ 890 891 /* 892 * Join link-local all-nodes address. 893 */ 894 bzero(&mltaddr, sizeof(mltaddr)); 895 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 896 mltaddr.sin6_family = AF_INET6; 897 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 898 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 899 goto cleanup; /* XXX: should not fail */ 900 901 /* 902 * XXX: do we really need this automatic routes? We should probably 903 * reconsider this stuff. Most applications actually do not need the 904 * routes, since they usually specify the outgoing interface. 905 */ 906 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 907 if (rt != NULL) { 908 /* XXX: only works in !SCOPEDROUTING case. */ 909 if (memcmp(&mltaddr.sin6_addr, 910 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, 911 MLTMASK_LEN)) { 912 RTFREE_LOCKED(rt); 913 rt = NULL; 914 } 915 } 916 if (rt == NULL) { 917 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr, 918 (struct sockaddr *)&ia->ia_addr, 919 (struct sockaddr *)&mltmask, RTF_UP, 920 (struct rtentry **)0, RT_DEFAULT_FIB); 921 if (error) 922 goto cleanup; 923 } else 924 RTFREE_LOCKED(rt); 925 926 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 927 if (imm == NULL) { 928 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 929 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 930 &mltaddr.sin6_addr), if_name(ifp), error)); 931 goto cleanup; 932 } 933 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 934 935 /* 936 * Join node information group address. 937 */ 938 delay = 0; 939 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 940 /* 941 * The spec does not say anything about delay for this group, 942 * but the same logic should apply. 943 */ 944 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 945 } 946 if (in6_nigroup(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) { 947 /* XXX jinmei */ 948 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay); 949 if (imm == NULL) 950 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 951 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 952 &mltaddr.sin6_addr), if_name(ifp), error)); 953 /* XXX not very fatal, go on... */ 954 else 955 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 956 } 957 if (V_icmp6_nodeinfo_oldmcprefix && 958 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) { 959 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay); 960 if (imm == NULL) 961 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 962 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 963 &mltaddr.sin6_addr), if_name(ifp), error)); 964 /* XXX not very fatal, go on... */ 965 else 966 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 967 } 968 969 /* 970 * Join interface-local all-nodes address. 971 * (ff01::1%ifN, and ff01::%ifN/32) 972 */ 973 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 974 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 975 goto cleanup; /* XXX: should not fail */ 976 /* XXX: again, do we really need the route? */ 977 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 978 if (rt != NULL) { 979 if (memcmp(&mltaddr.sin6_addr, 980 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, 981 MLTMASK_LEN)) { 982 RTFREE_LOCKED(rt); 983 rt = NULL; 984 } 985 } 986 if (rt == NULL) { 987 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr, 988 (struct sockaddr *)&ia->ia_addr, 989 (struct sockaddr *)&mltmask, RTF_UP, 990 (struct rtentry **)0, RT_DEFAULT_FIB); 991 if (error) 992 goto cleanup; 993 } else 994 RTFREE_LOCKED(rt); 995 996 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 997 if (imm == NULL) { 998 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 999 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 1000 &mltaddr.sin6_addr), if_name(ifp), error)); 1001 goto cleanup; 1002 } 1003 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1004#undef MLTMASK_LEN 1005 1006cleanup: 1007 return (error); 1008} 1009 1010/* 1011 * Update parameters of an IPv6 interface address. 1012 * If necessary, a new entry is created and linked into address chains. 1013 * This function is separated from in6_control(). 1014 */ 1015int 1016in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1017 struct in6_ifaddr *ia, int flags) 1018{ 1019 int error = 0, hostIsNew = 0, plen = -1; 1020 struct sockaddr_in6 dst6; 1021 struct in6_addrlifetime *lt; 1022 struct in6_multi *in6m_sol; 1023 int delay; 1024 char ip6buf[INET6_ADDRSTRLEN]; 1025 1026 /* Validate parameters */ 1027 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 1028 return (EINVAL); 1029 1030 /* 1031 * The destination address for a p2p link must have a family 1032 * of AF_UNSPEC or AF_INET6. 1033 */ 1034 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 1035 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 1036 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 1037 return (EAFNOSUPPORT); 1038 /* 1039 * validate ifra_prefixmask. don't check sin6_family, netmask 1040 * does not carry fields other than sin6_len. 1041 */ 1042 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 1043 return (EINVAL); 1044 /* 1045 * Because the IPv6 address architecture is classless, we require 1046 * users to specify a (non 0) prefix length (mask) for a new address. 1047 * We also require the prefix (when specified) mask is valid, and thus 1048 * reject a non-consecutive mask. 1049 */ 1050 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 1051 return (EINVAL); 1052 if (ifra->ifra_prefixmask.sin6_len != 0) { 1053 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 1054 (u_char *)&ifra->ifra_prefixmask + 1055 ifra->ifra_prefixmask.sin6_len); 1056 if (plen <= 0) 1057 return (EINVAL); 1058 } else { 1059 /* 1060 * In this case, ia must not be NULL. We just use its prefix 1061 * length. 1062 */ 1063 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1064 } 1065 /* 1066 * If the destination address on a p2p interface is specified, 1067 * and the address is a scoped one, validate/set the scope 1068 * zone identifier. 1069 */ 1070 dst6 = ifra->ifra_dstaddr; 1071 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 1072 (dst6.sin6_family == AF_INET6)) { 1073 struct in6_addr in6_tmp; 1074 u_int32_t zoneid; 1075 1076 in6_tmp = dst6.sin6_addr; 1077 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 1078 return (EINVAL); /* XXX: should be impossible */ 1079 1080 if (dst6.sin6_scope_id != 0) { 1081 if (dst6.sin6_scope_id != zoneid) 1082 return (EINVAL); 1083 } else /* user omit to specify the ID. */ 1084 dst6.sin6_scope_id = zoneid; 1085 1086 /* convert into the internal form */ 1087 if (sa6_embedscope(&dst6, 0)) 1088 return (EINVAL); /* XXX: should be impossible */ 1089 } 1090 /* 1091 * The destination address can be specified only for a p2p or a 1092 * loopback interface. If specified, the corresponding prefix length 1093 * must be 128. 1094 */ 1095 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 1096 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 1097 /* XXX: noisy message */ 1098 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 1099 "be specified for a p2p or a loopback IF only\n")); 1100 return (EINVAL); 1101 } 1102 if (plen != 128) { 1103 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 1104 "be 128 when dstaddr is specified\n")); 1105 return (EINVAL); 1106 } 1107 } 1108 /* lifetime consistency check */ 1109 lt = &ifra->ifra_lifetime; 1110 if (lt->ia6t_pltime > lt->ia6t_vltime) 1111 return (EINVAL); 1112 if (lt->ia6t_vltime == 0) { 1113 /* 1114 * the following log might be noisy, but this is a typical 1115 * configuration mistake or a tool's bug. 1116 */ 1117 nd6log((LOG_INFO, 1118 "in6_update_ifa: valid lifetime is 0 for %s\n", 1119 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr))); 1120 1121 if (ia == NULL) 1122 return (0); /* there's nothing to do */ 1123 } 1124 1125 /* 1126 * If this is a new address, allocate a new ifaddr and link it 1127 * into chains. 1128 */ 1129 if (ia == NULL) { 1130 hostIsNew = 1; 1131 /* 1132 * When in6_update_ifa() is called in a process of a received 1133 * RA, it is called under an interrupt context. So, we should 1134 * call malloc with M_NOWAIT. 1135 */ 1136 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR, 1137 M_NOWAIT); 1138 if (ia == NULL) 1139 return (ENOBUFS); 1140 bzero((caddr_t)ia, sizeof(*ia)); 1141 ifa_init(&ia->ia_ifa); 1142 LIST_INIT(&ia->ia6_memberships); 1143 /* Initialize the address and masks, and put time stamp */ 1144 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1145 ia->ia_addr.sin6_family = AF_INET6; 1146 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 1147 ia->ia6_createtime = time_uptime; 1148 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1149 /* 1150 * XXX: some functions expect that ifa_dstaddr is not 1151 * NULL for p2p interfaces. 1152 */ 1153 ia->ia_ifa.ifa_dstaddr = 1154 (struct sockaddr *)&ia->ia_dstaddr; 1155 } else { 1156 ia->ia_ifa.ifa_dstaddr = NULL; 1157 } 1158 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 1159 ia->ia_ifp = ifp; 1160 ifa_ref(&ia->ia_ifa); /* if_addrhead */ 1161 IF_ADDR_WLOCK(ifp); 1162 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1163 IF_ADDR_WUNLOCK(ifp); 1164 1165 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */ 1166 IN6_IFADDR_WLOCK(); 1167 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link); 1168 LIST_INSERT_HEAD(IN6ADDR_HASH(&ifra->ifra_addr.sin6_addr), 1169 ia, ia6_hash); 1170 IN6_IFADDR_WUNLOCK(); 1171 } 1172 1173 /* update timestamp */ 1174 ia->ia6_updatetime = time_uptime; 1175 1176 /* set prefix mask */ 1177 if (ifra->ifra_prefixmask.sin6_len) { 1178 /* 1179 * We prohibit changing the prefix length of an existing 1180 * address, because 1181 * + such an operation should be rare in IPv6, and 1182 * + the operation would confuse prefix management. 1183 */ 1184 if (ia->ia_prefixmask.sin6_len && 1185 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 1186 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an" 1187 " existing (%s) address should not be changed\n", 1188 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1189 error = EINVAL; 1190 goto unlink; 1191 } 1192 ia->ia_prefixmask = ifra->ifra_prefixmask; 1193 ia->ia_prefixmask.sin6_family = AF_INET6; 1194 } 1195 1196 /* 1197 * If a new destination address is specified, scrub the old one and 1198 * install the new destination. Note that the interface must be 1199 * p2p or loopback (see the check above.) 1200 */ 1201 if (dst6.sin6_family == AF_INET6 && 1202 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1203 int e; 1204 1205 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1206 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) { 1207 nd6log((LOG_ERR, "in6_update_ifa: failed to remove " 1208 "a route to the old destination: %s\n", 1209 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1210 /* proceed anyway... */ 1211 } else 1212 ia->ia_flags &= ~IFA_ROUTE; 1213 ia->ia_dstaddr = dst6; 1214 } 1215 1216 /* 1217 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1218 * to see if the address is deprecated or invalidated, but initialize 1219 * these members for applications. 1220 */ 1221 ia->ia6_lifetime = ifra->ifra_lifetime; 1222 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1223 ia->ia6_lifetime.ia6t_expire = 1224 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1225 } else 1226 ia->ia6_lifetime.ia6t_expire = 0; 1227 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1228 ia->ia6_lifetime.ia6t_preferred = 1229 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1230 } else 1231 ia->ia6_lifetime.ia6t_preferred = 0; 1232 1233 /* reset the interface and routing table appropriately. */ 1234 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 1235 goto unlink; 1236 1237 /* 1238 * configure address flags. 1239 */ 1240 ia->ia6_flags = ifra->ifra_flags; 1241 /* 1242 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1243 * userland, make it deprecated. 1244 */ 1245 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1246 ia->ia6_lifetime.ia6t_pltime = 0; 1247 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1248 } 1249 /* 1250 * Make the address tentative before joining multicast addresses, 1251 * so that corresponding MLD responses would not have a tentative 1252 * source address. 1253 */ 1254 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1255 1256 /* 1257 * DAD should be performed for an new address or addresses on 1258 * an interface with ND6_IFF_IFDISABLED. 1259 */ 1260 if (in6if_do_dad(ifp) && 1261 (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED))) 1262 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1263 1264 /* 1265 * We are done if we have simply modified an existing address. 1266 */ 1267 if (!hostIsNew) 1268 return (error); 1269 1270 /* 1271 * Beyond this point, we should call in6_purgeaddr upon an error, 1272 * not just go to unlink. 1273 */ 1274 1275 /* Join necessary multicast groups. */ 1276 in6m_sol = NULL; 1277 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1278 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol); 1279 if (error) 1280 goto cleanup; 1281 } 1282 1283 /* Perform DAD, if the address is TENTATIVE. */ 1284 if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) { 1285 int mindelay, maxdelay; 1286 1287 delay = 0; 1288 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1289 /* 1290 * We need to impose a delay before sending an NS 1291 * for DAD. Check if we also needed a delay for the 1292 * corresponding MLD message. If we did, the delay 1293 * should be larger than the MLD delay (this could be 1294 * relaxed a bit, but this simple logic is at least 1295 * safe). 1296 * XXX: Break data hiding guidelines and look at 1297 * state for the solicited multicast group. 1298 */ 1299 mindelay = 0; 1300 if (in6m_sol != NULL && 1301 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) { 1302 mindelay = in6m_sol->in6m_timer; 1303 } 1304 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1305 if (maxdelay - mindelay == 0) 1306 delay = 0; 1307 else { 1308 delay = 1309 (arc4random() % (maxdelay - mindelay)) + 1310 mindelay; 1311 } 1312 } 1313 nd6_dad_start((struct ifaddr *)ia, delay); 1314 } 1315 1316 KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew")); 1317 ifa_free(&ia->ia_ifa); 1318 return (error); 1319 1320 unlink: 1321 /* 1322 * XXX: if a change of an existing address failed, keep the entry 1323 * anyway. 1324 */ 1325 if (hostIsNew) { 1326 in6_unlink_ifa(ia, ifp); 1327 ifa_free(&ia->ia_ifa); 1328 } 1329 return (error); 1330 1331 cleanup: 1332 KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew")); 1333 ifa_free(&ia->ia_ifa); 1334 in6_purgeaddr(&ia->ia_ifa); 1335 return error; 1336} 1337 1338/* 1339 * Leave multicast groups. Factored out from in6_purgeaddr(). 1340 * This entire work should only be done once, for the default FIB. 1341 */ 1342static int 1343in6_purgeaddr_mc(struct ifnet *ifp, struct in6_ifaddr *ia, struct ifaddr *ifa0) 1344{ 1345 struct sockaddr_in6 mltaddr, mltmask; 1346 struct in6_multi_mship *imm; 1347 struct rtentry *rt; 1348 struct sockaddr_in6 sin6; 1349 int error; 1350 1351 /* 1352 * Leave from multicast groups we have joined for the interface. 1353 */ 1354 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1355 LIST_REMOVE(imm, i6mm_chain); 1356 in6_leavegroup(imm); 1357 } 1358 1359 /* 1360 * Remove the link-local all-nodes address. 1361 */ 1362 bzero(&mltmask, sizeof(mltmask)); 1363 mltmask.sin6_len = sizeof(struct sockaddr_in6); 1364 mltmask.sin6_family = AF_INET6; 1365 mltmask.sin6_addr = in6mask32; 1366 1367 bzero(&mltaddr, sizeof(mltaddr)); 1368 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 1369 mltaddr.sin6_family = AF_INET6; 1370 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 1371 1372 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1373 return (error); 1374 1375 /* 1376 * As for the mltaddr above, proactively prepare the sin6 to avoid 1377 * rtentry un- and re-locking. 1378 */ 1379 if (ifa0 != NULL) { 1380 bzero(&sin6, sizeof(sin6)); 1381 sin6.sin6_len = sizeof(sin6); 1382 sin6.sin6_family = AF_INET6; 1383 memcpy(&sin6.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, 1384 sizeof(sin6.sin6_addr)); 1385 error = in6_setscope(&sin6.sin6_addr, ifa0->ifa_ifp, NULL); 1386 if (error != 0) 1387 return (error); 1388 } 1389 1390 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 1391 if (rt != NULL && rt->rt_gateway != NULL && 1392 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 1393 &ia->ia_addr.sin6_addr, 1394 sizeof(ia->ia_addr.sin6_addr)) == 0)) { 1395 /* 1396 * If no more IPv6 address exists on this interface then 1397 * remove the multicast address route. 1398 */ 1399 if (ifa0 == NULL) { 1400 memcpy(&mltaddr.sin6_addr, 1401 &satosin6(rt_key(rt))->sin6_addr, 1402 sizeof(mltaddr.sin6_addr)); 1403 RTFREE_LOCKED(rt); 1404 error = in6_rtrequest(RTM_DELETE, 1405 (struct sockaddr *)&mltaddr, 1406 (struct sockaddr *)&ia->ia_addr, 1407 (struct sockaddr *)&mltmask, RTF_UP, 1408 (struct rtentry **)0, RT_DEFAULT_FIB); 1409 if (error) 1410 log(LOG_INFO, "%s: link-local all-nodes " 1411 "multicast address deletion error\n", 1412 __func__); 1413 } else { 1414 /* 1415 * Replace the gateway of the route. 1416 */ 1417 memcpy(rt->rt_gateway, &sin6, sizeof(sin6)); 1418 RTFREE_LOCKED(rt); 1419 } 1420 } else { 1421 if (rt != NULL) 1422 RTFREE_LOCKED(rt); 1423 } 1424 1425 /* 1426 * Remove the node-local all-nodes address. 1427 */ 1428 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1429 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1430 return (error); 1431 1432 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 1433 if (rt != NULL && rt->rt_gateway != NULL && 1434 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 1435 &ia->ia_addr.sin6_addr, 1436 sizeof(ia->ia_addr.sin6_addr)) == 0)) { 1437 /* 1438 * If no more IPv6 address exists on this interface then 1439 * remove the multicast address route. 1440 */ 1441 if (ifa0 == NULL) { 1442 memcpy(&mltaddr.sin6_addr, 1443 &satosin6(rt_key(rt))->sin6_addr, 1444 sizeof(mltaddr.sin6_addr)); 1445 1446 RTFREE_LOCKED(rt); 1447 error = in6_rtrequest(RTM_DELETE, 1448 (struct sockaddr *)&mltaddr, 1449 (struct sockaddr *)&ia->ia_addr, 1450 (struct sockaddr *)&mltmask, RTF_UP, 1451 (struct rtentry **)0, RT_DEFAULT_FIB); 1452 if (error) 1453 log(LOG_INFO, "%s: node-local all-nodes" 1454 "multicast address deletion error\n", 1455 __func__); 1456 } else { 1457 /* 1458 * Replace the gateway of the route. 1459 */ 1460 memcpy(rt->rt_gateway, &sin6, sizeof(sin6)); 1461 RTFREE_LOCKED(rt); 1462 } 1463 } else { 1464 if (rt != NULL) 1465 RTFREE_LOCKED(rt); 1466 } 1467 1468 return (0); 1469} 1470 1471void 1472in6_purgeaddr(struct ifaddr *ifa) 1473{ 1474 struct ifnet *ifp = ifa->ifa_ifp; 1475 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1476 int plen, error; 1477 struct ifaddr *ifa0; 1478 1479 if (ifa->ifa_carp) 1480 (*carp_detach_p)(ifa); 1481 1482 /* 1483 * find another IPv6 address as the gateway for the 1484 * link-local and node-local all-nodes multicast 1485 * address routes 1486 */ 1487 IF_ADDR_RLOCK(ifp); 1488 TAILQ_FOREACH(ifa0, &ifp->if_addrhead, ifa_link) { 1489 if ((ifa0->ifa_addr->sa_family != AF_INET6) || 1490 memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr, 1491 &ia->ia_addr.sin6_addr, sizeof(struct in6_addr)) == 0) 1492 continue; 1493 else 1494 break; 1495 } 1496 if (ifa0 != NULL) 1497 ifa_ref(ifa0); 1498 IF_ADDR_RUNLOCK(ifp); 1499 1500 /* 1501 * Remove the loopback route to the interface address. 1502 * The check for the current setting of "nd6_useloopback" 1503 * is not needed. 1504 */ 1505 if (ia->ia_flags & IFA_RTSELF) { 1506 error = ifa_del_loopback_route((struct ifaddr *)ia, 1507 (struct sockaddr *)&ia->ia_addr); 1508 if (error == 0) 1509 ia->ia_flags &= ~IFA_RTSELF; 1510 } 1511 1512 /* stop DAD processing */ 1513 nd6_dad_stop(ifa); 1514 1515 /* Remove local address entry from lltable. */ 1516 in6_ifremloop(ifa); 1517 1518 /* Leave multicast groups. */ 1519 error = in6_purgeaddr_mc(ifp, ia, ifa0); 1520 1521 if (ifa0 != NULL) 1522 ifa_free(ifa0); 1523 1524 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1525 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) { 1526 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags | 1527 (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0); 1528 if (error != 0) 1529 log(LOG_INFO, "%s: err=%d, destination address delete " 1530 "failed\n", __func__, error); 1531 ia->ia_flags &= ~IFA_ROUTE; 1532 } 1533 1534 in6_unlink_ifa(ia, ifp); 1535} 1536 1537static void 1538in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1539{ 1540 char ip6buf[INET6_ADDRSTRLEN]; 1541 1542 IF_ADDR_WLOCK(ifp); 1543 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1544 IF_ADDR_WUNLOCK(ifp); 1545 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1546 1547 /* 1548 * Defer the release of what might be the last reference to the 1549 * in6_ifaddr so that it can't be freed before the remainder of the 1550 * cleanup. 1551 */ 1552 IN6_IFADDR_WLOCK(); 1553 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 1554 LIST_REMOVE(ia, ia6_hash); 1555 IN6_IFADDR_WUNLOCK(); 1556 1557 /* 1558 * Release the reference to the base prefix. There should be a 1559 * positive reference. 1560 */ 1561 if (ia->ia6_ndpr == NULL) { 1562 nd6log((LOG_NOTICE, 1563 "in6_unlink_ifa: autoconf'ed address " 1564 "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia)))); 1565 } else { 1566 ia->ia6_ndpr->ndpr_refcnt--; 1567 ia->ia6_ndpr = NULL; 1568 } 1569 1570 /* 1571 * Also, if the address being removed is autoconf'ed, call 1572 * pfxlist_onlink_check() since the release might affect the status of 1573 * other (detached) addresses. 1574 */ 1575 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1576 pfxlist_onlink_check(); 1577 } 1578 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1579} 1580 1581void 1582in6_purgeif(struct ifnet *ifp) 1583{ 1584 struct ifaddr *ifa, *nifa; 1585 1586 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) { 1587 if (ifa->ifa_addr->sa_family != AF_INET6) 1588 continue; 1589 in6_purgeaddr(ifa); 1590 } 1591 1592 in6_ifdetach(ifp); 1593} 1594 1595/* 1596 * SIOC[GAD]LIFADDR. 1597 * SIOCGLIFADDR: get first address. (?) 1598 * SIOCGLIFADDR with IFLR_PREFIX: 1599 * get first address that matches the specified prefix. 1600 * SIOCALIFADDR: add the specified address. 1601 * SIOCALIFADDR with IFLR_PREFIX: 1602 * add the specified prefix, filling hostid part from 1603 * the first link-local address. prefixlen must be <= 64. 1604 * SIOCDLIFADDR: delete the specified address. 1605 * SIOCDLIFADDR with IFLR_PREFIX: 1606 * delete the first address that matches the specified prefix. 1607 * return values: 1608 * EINVAL on invalid parameters 1609 * EADDRNOTAVAIL on prefix match failed/specified address not found 1610 * other values may be returned from in6_ioctl() 1611 * 1612 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1613 * this is to accomodate address naming scheme other than RFC2374, 1614 * in the future. 1615 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1616 * address encoding scheme. (see figure on page 8) 1617 * Notifies other subsystems about address change/arrival: 1618 * 1) Notifies device handler on the first IPv6 address assignment 1619 * 2) Handle routing table changes for P2P links and route 1620 * 3) Handle routing table changes for address host route 1621 */ 1622static int 1623in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 1624 struct ifnet *ifp, struct thread *td) 1625{ 1626 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1627 struct ifaddr *ifa; 1628 struct sockaddr *sa; 1629 1630 /* sanity checks */ 1631 if (!data || !ifp) { 1632 panic("invalid argument to in6_lifaddr_ioctl"); 1633 /* NOTREACHED */ 1634 } 1635 1636 switch (cmd) { 1637 case SIOCGLIFADDR: 1638 /* address must be specified on GET with IFLR_PREFIX */ 1639 if ((iflr->flags & IFLR_PREFIX) == 0) 1640 break; 1641 /* FALLTHROUGH */ 1642 case SIOCALIFADDR: 1643 case SIOCDLIFADDR: 1644 /* address must be specified on ADD and DELETE */ 1645 sa = (struct sockaddr *)&iflr->addr; 1646 if (sa->sa_family != AF_INET6) 1647 return EINVAL; 1648 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1649 return EINVAL; 1650 /* XXX need improvement */ 1651 sa = (struct sockaddr *)&iflr->dstaddr; 1652 if (sa->sa_family && sa->sa_family != AF_INET6) 1653 return EINVAL; 1654 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1655 return EINVAL; 1656 break; 1657 default: /* shouldn't happen */ 1658#if 0 1659 panic("invalid cmd to in6_lifaddr_ioctl"); 1660 /* NOTREACHED */ 1661#else 1662 return EOPNOTSUPP; 1663#endif 1664 } 1665 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) 1666 return EINVAL; 1667 1668 switch (cmd) { 1669 case SIOCALIFADDR: 1670 { 1671 struct in6_aliasreq ifra; 1672 struct in6_addr *hostid = NULL; 1673 int prefixlen; 1674 1675 ifa = NULL; 1676 if ((iflr->flags & IFLR_PREFIX) != 0) { 1677 struct sockaddr_in6 *sin6; 1678 1679 /* 1680 * hostid is to fill in the hostid part of the 1681 * address. hostid points to the first link-local 1682 * address attached to the interface. 1683 */ 1684 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1685 if (!ifa) 1686 return EADDRNOTAVAIL; 1687 hostid = IFA_IN6(ifa); 1688 1689 /* prefixlen must be <= 64. */ 1690 if (64 < iflr->prefixlen) { 1691 if (ifa != NULL) 1692 ifa_free(ifa); 1693 return EINVAL; 1694 } 1695 prefixlen = iflr->prefixlen; 1696 1697 /* hostid part must be zero. */ 1698 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1699 if (sin6->sin6_addr.s6_addr32[2] != 0 || 1700 sin6->sin6_addr.s6_addr32[3] != 0) { 1701 if (ifa != NULL) 1702 ifa_free(ifa); 1703 return EINVAL; 1704 } 1705 } else 1706 prefixlen = iflr->prefixlen; 1707 1708 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1709 bzero(&ifra, sizeof(ifra)); 1710 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name)); 1711 1712 bcopy(&iflr->addr, &ifra.ifra_addr, 1713 ((struct sockaddr *)&iflr->addr)->sa_len); 1714 if (hostid) { 1715 /* fill in hostid part */ 1716 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1717 hostid->s6_addr32[2]; 1718 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1719 hostid->s6_addr32[3]; 1720 } 1721 1722 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1723 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1724 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1725 if (hostid) { 1726 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1727 hostid->s6_addr32[2]; 1728 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1729 hostid->s6_addr32[3]; 1730 } 1731 } 1732 if (ifa != NULL) 1733 ifa_free(ifa); 1734 1735 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1736 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1737 1738 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1739 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td); 1740 } 1741 case SIOCGLIFADDR: 1742 case SIOCDLIFADDR: 1743 { 1744 struct in6_ifaddr *ia; 1745 struct in6_addr mask, candidate, match; 1746 struct sockaddr_in6 *sin6; 1747 int cmp; 1748 1749 bzero(&mask, sizeof(mask)); 1750 if (iflr->flags & IFLR_PREFIX) { 1751 /* lookup a prefix rather than address. */ 1752 in6_prefixlen2mask(&mask, iflr->prefixlen); 1753 1754 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1755 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1756 match.s6_addr32[0] &= mask.s6_addr32[0]; 1757 match.s6_addr32[1] &= mask.s6_addr32[1]; 1758 match.s6_addr32[2] &= mask.s6_addr32[2]; 1759 match.s6_addr32[3] &= mask.s6_addr32[3]; 1760 1761 /* if you set extra bits, that's wrong */ 1762 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1763 return EINVAL; 1764 1765 cmp = 1; 1766 } else { 1767 if (cmd == SIOCGLIFADDR) { 1768 /* on getting an address, take the 1st match */ 1769 cmp = 0; /* XXX */ 1770 } else { 1771 /* on deleting an address, do exact match */ 1772 in6_prefixlen2mask(&mask, 128); 1773 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1774 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1775 1776 cmp = 1; 1777 } 1778 } 1779 1780 IF_ADDR_RLOCK(ifp); 1781 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1782 if (ifa->ifa_addr->sa_family != AF_INET6) 1783 continue; 1784 if (!cmp) 1785 break; 1786 1787 /* 1788 * XXX: this is adhoc, but is necessary to allow 1789 * a user to specify fe80::/64 (not /10) for a 1790 * link-local address. 1791 */ 1792 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1793 in6_clearscope(&candidate); 1794 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1795 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1796 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1797 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1798 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1799 break; 1800 } 1801 if (ifa != NULL) 1802 ifa_ref(ifa); 1803 IF_ADDR_RUNLOCK(ifp); 1804 if (!ifa) 1805 return EADDRNOTAVAIL; 1806 ia = ifa2ia6(ifa); 1807 1808 if (cmd == SIOCGLIFADDR) { 1809 int error; 1810 1811 /* fill in the if_laddrreq structure */ 1812 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1813 error = sa6_recoverscope( 1814 (struct sockaddr_in6 *)&iflr->addr); 1815 if (error != 0) { 1816 ifa_free(ifa); 1817 return (error); 1818 } 1819 1820 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1821 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1822 ia->ia_dstaddr.sin6_len); 1823 error = sa6_recoverscope( 1824 (struct sockaddr_in6 *)&iflr->dstaddr); 1825 if (error != 0) { 1826 ifa_free(ifa); 1827 return (error); 1828 } 1829 } else 1830 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1831 1832 iflr->prefixlen = 1833 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1834 1835 iflr->flags = ia->ia6_flags; /* XXX */ 1836 ifa_free(ifa); 1837 1838 return 0; 1839 } else { 1840 struct in6_aliasreq ifra; 1841 1842 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1843 bzero(&ifra, sizeof(ifra)); 1844 bcopy(iflr->iflr_name, ifra.ifra_name, 1845 sizeof(ifra.ifra_name)); 1846 1847 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1848 ia->ia_addr.sin6_len); 1849 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1850 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1851 ia->ia_dstaddr.sin6_len); 1852 } else { 1853 bzero(&ifra.ifra_dstaddr, 1854 sizeof(ifra.ifra_dstaddr)); 1855 } 1856 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1857 ia->ia_prefixmask.sin6_len); 1858 1859 ifra.ifra_flags = ia->ia6_flags; 1860 ifa_free(ifa); 1861 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, 1862 ifp, td); 1863 } 1864 } 1865 } 1866 1867 return EOPNOTSUPP; /* just for safety */ 1868} 1869 1870/* 1871 * Initialize an interface's IPv6 address and routing table entry. 1872 */ 1873static int 1874in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1875 struct sockaddr_in6 *sin6, int newhost) 1876{ 1877 int error = 0, plen, ifacount = 0; 1878 struct ifaddr *ifa; 1879 1880 /* 1881 * Give the interface a chance to initialize 1882 * if this is its first address, 1883 * and to validate the address if necessary. 1884 */ 1885 IF_ADDR_RLOCK(ifp); 1886 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1887 if (ifa->ifa_addr->sa_family != AF_INET6) 1888 continue; 1889 ifacount++; 1890 } 1891 IF_ADDR_RUNLOCK(ifp); 1892 1893 ia->ia_addr = *sin6; 1894 1895 if (ifacount <= 1 && ifp->if_ioctl) { 1896 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1897 if (error) 1898 return (error); 1899 } 1900 1901 ia->ia_ifa.ifa_metric = ifp->if_metric; 1902 1903 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1904 1905 /* 1906 * Special case: 1907 * If a new destination address is specified for a point-to-point 1908 * interface, install a route to the destination as an interface 1909 * direct route. 1910 * XXX: the logic below rejects assigning multiple addresses on a p2p 1911 * interface that share the same destination. 1912 */ 1913 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1914 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 && 1915 ia->ia_dstaddr.sin6_family == AF_INET6) { 1916 int rtflags = RTF_UP | RTF_HOST; 1917 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags); 1918 if (error) 1919 return (error); 1920 ia->ia_flags |= IFA_ROUTE; 1921 /* 1922 * Handle the case for ::1 . 1923 */ 1924 if (ifp->if_flags & IFF_LOOPBACK) 1925 ia->ia_flags |= IFA_RTSELF; 1926 } 1927 1928 /* 1929 * add a loopback route to self 1930 */ 1931 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) { 1932 error = ifa_add_loopback_route((struct ifaddr *)ia, 1933 (struct sockaddr *)&ia->ia_addr); 1934 if (error == 0) 1935 ia->ia_flags |= IFA_RTSELF; 1936 } 1937 1938 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1939 if (newhost) 1940 in6_ifaddloop(&(ia->ia_ifa)); 1941 1942 return (error); 1943} 1944 1945/* 1946 * Find an IPv6 interface link-local address specific to an interface. 1947 * ifaddr is returned referenced. 1948 */ 1949struct in6_ifaddr * 1950in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1951{ 1952 struct ifaddr *ifa; 1953 1954 IF_ADDR_RLOCK(ifp); 1955 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1956 if (ifa->ifa_addr->sa_family != AF_INET6) 1957 continue; 1958 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1959 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1960 ignoreflags) != 0) 1961 continue; 1962 ifa_ref(ifa); 1963 break; 1964 } 1965 } 1966 IF_ADDR_RUNLOCK(ifp); 1967 1968 return ((struct in6_ifaddr *)ifa); 1969} 1970 1971 1972/* 1973 * find the internet address corresponding to a given interface and address. 1974 * ifaddr is returned referenced. 1975 */ 1976struct in6_ifaddr * 1977in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr) 1978{ 1979 struct ifaddr *ifa; 1980 1981 IF_ADDR_RLOCK(ifp); 1982 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1983 if (ifa->ifa_addr->sa_family != AF_INET6) 1984 continue; 1985 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1986 ifa_ref(ifa); 1987 break; 1988 } 1989 } 1990 IF_ADDR_RUNLOCK(ifp); 1991 1992 return ((struct in6_ifaddr *)ifa); 1993} 1994 1995/* 1996 * Find a link-local scoped address on ifp and return it if any. 1997 */ 1998struct in6_ifaddr * 1999in6ifa_llaonifp(struct ifnet *ifp) 2000{ 2001 struct sockaddr_in6 *sin6; 2002 struct ifaddr *ifa; 2003 2004 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 2005 return (NULL); 2006 if_addr_rlock(ifp); 2007 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2008 if (ifa->ifa_addr->sa_family != AF_INET6) 2009 continue; 2010 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 2011 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 2012 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) || 2013 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr)) 2014 break; 2015 } 2016 if_addr_runlock(ifp); 2017 2018 return ((struct in6_ifaddr *)ifa); 2019} 2020 2021/* 2022 * Convert IP6 address to printable (loggable) representation. Caller 2023 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 2024 */ 2025static char digits[] = "0123456789abcdef"; 2026char * 2027ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 2028{ 2029 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0; 2030 char *cp; 2031 const u_int16_t *a = (const u_int16_t *)addr; 2032 const u_int8_t *d; 2033 int dcolon = 0, zero = 0; 2034 2035 cp = ip6buf; 2036 2037 for (i = 0; i < 8; i++) { 2038 if (*(a + i) == 0) { 2039 cnt++; 2040 if (cnt == 1) 2041 idx = i; 2042 } 2043 else if (maxcnt < cnt) { 2044 maxcnt = cnt; 2045 index = idx; 2046 cnt = 0; 2047 } 2048 } 2049 if (maxcnt < cnt) { 2050 maxcnt = cnt; 2051 index = idx; 2052 } 2053 2054 for (i = 0; i < 8; i++) { 2055 if (dcolon == 1) { 2056 if (*a == 0) { 2057 if (i == 7) 2058 *cp++ = ':'; 2059 a++; 2060 continue; 2061 } else 2062 dcolon = 2; 2063 } 2064 if (*a == 0) { 2065 if (dcolon == 0 && *(a + 1) == 0 && i == index) { 2066 if (i == 0) 2067 *cp++ = ':'; 2068 *cp++ = ':'; 2069 dcolon = 1; 2070 } else { 2071 *cp++ = '0'; 2072 *cp++ = ':'; 2073 } 2074 a++; 2075 continue; 2076 } 2077 d = (const u_char *)a; 2078 /* Try to eliminate leading zeros in printout like in :0001. */ 2079 zero = 1; 2080 *cp = digits[*d >> 4]; 2081 if (*cp != '0') { 2082 zero = 0; 2083 cp++; 2084 } 2085 *cp = digits[*d++ & 0xf]; 2086 if (zero == 0 || (*cp != '0')) { 2087 zero = 0; 2088 cp++; 2089 } 2090 *cp = digits[*d >> 4]; 2091 if (zero == 0 || (*cp != '0')) { 2092 zero = 0; 2093 cp++; 2094 } 2095 *cp++ = digits[*d & 0xf]; 2096 *cp++ = ':'; 2097 a++; 2098 } 2099 *--cp = '\0'; 2100 return (ip6buf); 2101} 2102 2103int 2104in6_localaddr(struct in6_addr *in6) 2105{ 2106 struct in6_ifaddr *ia; 2107 2108 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 2109 return 1; 2110 2111 IN6_IFADDR_RLOCK(); 2112 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 2113 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 2114 &ia->ia_prefixmask.sin6_addr)) { 2115 IN6_IFADDR_RUNLOCK(); 2116 return 1; 2117 } 2118 } 2119 IN6_IFADDR_RUNLOCK(); 2120 2121 return (0); 2122} 2123 2124/* 2125 * Return 1 if an internet address is for the local host and configured 2126 * on one of its interfaces. 2127 */ 2128int 2129in6_localip(struct in6_addr *in6) 2130{ 2131 struct in6_ifaddr *ia; 2132 2133 IN6_IFADDR_RLOCK(); 2134 LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 2135 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) { 2136 IN6_IFADDR_RUNLOCK(); 2137 return (1); 2138 } 2139 } 2140 IN6_IFADDR_RUNLOCK(); 2141 return (0); 2142} 2143 2144int 2145in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 2146{ 2147 struct in6_ifaddr *ia; 2148 2149 IN6_IFADDR_RLOCK(); 2150 LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) { 2151 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) { 2152 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 2153 IN6_IFADDR_RUNLOCK(); 2154 return (1); /* true */ 2155 } 2156 break; 2157 } 2158 } 2159 IN6_IFADDR_RUNLOCK(); 2160 2161 return (0); /* false */ 2162} 2163 2164/* 2165 * return length of part which dst and src are equal 2166 * hard coding... 2167 */ 2168int 2169in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 2170{ 2171 int match = 0; 2172 u_char *s = (u_char *)src, *d = (u_char *)dst; 2173 u_char *lim = s + 16, r; 2174 2175 while (s < lim) 2176 if ((r = (*d++ ^ *s++)) != 0) { 2177 while (r < 128) { 2178 match++; 2179 r <<= 1; 2180 } 2181 break; 2182 } else 2183 match += 8; 2184 return match; 2185} 2186 2187/* XXX: to be scope conscious */ 2188int 2189in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 2190{ 2191 int bytelen, bitlen; 2192 2193 /* sanity check */ 2194 if (0 > len || len > 128) { 2195 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 2196 len); 2197 return (0); 2198 } 2199 2200 bytelen = len / 8; 2201 bitlen = len % 8; 2202 2203 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 2204 return (0); 2205 if (bitlen != 0 && 2206 p1->s6_addr[bytelen] >> (8 - bitlen) != 2207 p2->s6_addr[bytelen] >> (8 - bitlen)) 2208 return (0); 2209 2210 return (1); 2211} 2212 2213void 2214in6_prefixlen2mask(struct in6_addr *maskp, int len) 2215{ 2216 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 2217 int bytelen, bitlen, i; 2218 2219 /* sanity check */ 2220 if (0 > len || len > 128) { 2221 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 2222 len); 2223 return; 2224 } 2225 2226 bzero(maskp, sizeof(*maskp)); 2227 bytelen = len / 8; 2228 bitlen = len % 8; 2229 for (i = 0; i < bytelen; i++) 2230 maskp->s6_addr[i] = 0xff; 2231 if (bitlen) 2232 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 2233} 2234 2235/* 2236 * return the best address out of the same scope. if no address was 2237 * found, return the first valid address from designated IF. 2238 */ 2239struct in6_ifaddr * 2240in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2241{ 2242 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2243 struct ifaddr *ifa; 2244 struct in6_ifaddr *besta = 0; 2245 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2246 2247 dep[0] = dep[1] = NULL; 2248 2249 /* 2250 * We first look for addresses in the same scope. 2251 * If there is one, return it. 2252 * If two or more, return one which matches the dst longest. 2253 * If none, return one of global addresses assigned other ifs. 2254 */ 2255 IF_ADDR_RLOCK(ifp); 2256 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2257 if (ifa->ifa_addr->sa_family != AF_INET6) 2258 continue; 2259 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2260 continue; /* XXX: is there any case to allow anycast? */ 2261 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2262 continue; /* don't use this interface */ 2263 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2264 continue; 2265 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2266 if (V_ip6_use_deprecated) 2267 dep[0] = (struct in6_ifaddr *)ifa; 2268 continue; 2269 } 2270 2271 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2272 /* 2273 * call in6_matchlen() as few as possible 2274 */ 2275 if (besta) { 2276 if (blen == -1) 2277 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2278 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2279 if (tlen > blen) { 2280 blen = tlen; 2281 besta = (struct in6_ifaddr *)ifa; 2282 } 2283 } else 2284 besta = (struct in6_ifaddr *)ifa; 2285 } 2286 } 2287 if (besta) { 2288 ifa_ref(&besta->ia_ifa); 2289 IF_ADDR_RUNLOCK(ifp); 2290 return (besta); 2291 } 2292 2293 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2294 if (ifa->ifa_addr->sa_family != AF_INET6) 2295 continue; 2296 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2297 continue; /* XXX: is there any case to allow anycast? */ 2298 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2299 continue; /* don't use this interface */ 2300 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2301 continue; 2302 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2303 if (V_ip6_use_deprecated) 2304 dep[1] = (struct in6_ifaddr *)ifa; 2305 continue; 2306 } 2307 2308 if (ifa != NULL) 2309 ifa_ref(ifa); 2310 IF_ADDR_RUNLOCK(ifp); 2311 return (struct in6_ifaddr *)ifa; 2312 } 2313 2314 /* use the last-resort values, that are, deprecated addresses */ 2315 if (dep[0]) { 2316 ifa_ref((struct ifaddr *)dep[0]); 2317 IF_ADDR_RUNLOCK(ifp); 2318 return dep[0]; 2319 } 2320 if (dep[1]) { 2321 ifa_ref((struct ifaddr *)dep[1]); 2322 IF_ADDR_RUNLOCK(ifp); 2323 return dep[1]; 2324 } 2325 2326 IF_ADDR_RUNLOCK(ifp); 2327 return NULL; 2328} 2329 2330/* 2331 * perform DAD when interface becomes IFF_UP. 2332 */ 2333void 2334in6_if_up(struct ifnet *ifp) 2335{ 2336 struct ifaddr *ifa; 2337 struct in6_ifaddr *ia; 2338 2339 IF_ADDR_RLOCK(ifp); 2340 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2341 if (ifa->ifa_addr->sa_family != AF_INET6) 2342 continue; 2343 ia = (struct in6_ifaddr *)ifa; 2344 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2345 /* 2346 * The TENTATIVE flag was likely set by hand 2347 * beforehand, implicitly indicating the need for DAD. 2348 * We may be able to skip the random delay in this 2349 * case, but we impose delays just in case. 2350 */ 2351 nd6_dad_start(ifa, 2352 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 2353 } 2354 } 2355 IF_ADDR_RUNLOCK(ifp); 2356 2357 /* 2358 * special cases, like 6to4, are handled in in6_ifattach 2359 */ 2360 in6_ifattach(ifp, NULL); 2361} 2362 2363int 2364in6if_do_dad(struct ifnet *ifp) 2365{ 2366 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 2367 return (0); 2368 2369 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) || 2370 (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD)) 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 * This function returns EAGAIN in that case. 2392 * The caller should mark "tentative" on the address instead of 2393 * performing DAD immediately. 2394 */ 2395 if (!((ifp->if_flags & IFF_UP) && 2396 (ifp->if_drv_flags & IFF_DRV_RUNNING))) 2397 return (EAGAIN); 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(&lle->base.ln_timer_ch, 1); 2522 2523 return (&lle->base); 2524} 2525 2526static void 2527in6_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix, 2528 const struct sockaddr *mask, u_int flags) 2529{ 2530 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix; 2531 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask; 2532 struct llentry *lle, *next; 2533 int i; 2534 2535 /* 2536 * (flags & LLE_STATIC) means deleting all entries 2537 * including static ND6 entries. 2538 */ 2539 IF_AFDATA_WLOCK(llt->llt_ifp); 2540 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 2541 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 2542 if (IN6_ARE_MASKED_ADDR_EQUAL( 2543 &satosin6(L3_ADDR(lle))->sin6_addr, 2544 &pfx->sin6_addr, &msk->sin6_addr) && 2545 ((flags & LLE_STATIC) || 2546 !(lle->la_flags & LLE_STATIC))) { 2547 LLE_WLOCK(lle); 2548 if (callout_stop(&lle->la_timer)) 2549 LLE_REMREF(lle); 2550 llentry_free(lle); 2551 } 2552 } 2553 } 2554 IF_AFDATA_WUNLOCK(llt->llt_ifp); 2555} 2556 2557static int 2558in6_lltable_rtcheck(struct ifnet *ifp, 2559 u_int flags, 2560 const struct sockaddr *l3addr) 2561{ 2562 struct rtentry *rt; 2563 char ip6buf[INET6_ADDRSTRLEN]; 2564 2565 KASSERT(l3addr->sa_family == AF_INET6, 2566 ("sin_family %d", l3addr->sa_family)); 2567 2568 /* Our local addresses are always only installed on the default FIB. */ 2569 /* XXX rtalloc1 should take a const param */ 2570 rt = in6_rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0, 2571 RT_DEFAULT_FIB); 2572 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 2573 struct ifaddr *ifa; 2574 /* 2575 * Create an ND6 cache for an IPv6 neighbor 2576 * that is not covered by our own prefix. 2577 */ 2578 /* XXX ifaof_ifpforaddr should take a const param */ 2579 ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp); 2580 if (ifa != NULL) { 2581 ifa_free(ifa); 2582 if (rt != NULL) 2583 RTFREE_LOCKED(rt); 2584 return 0; 2585 } 2586 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2587 ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr)); 2588 if (rt != NULL) 2589 RTFREE_LOCKED(rt); 2590 return EINVAL; 2591 } 2592 RTFREE_LOCKED(rt); 2593 return 0; 2594} 2595 2596static struct llentry * 2597in6_lltable_lookup(struct lltable *llt, u_int flags, 2598 const struct sockaddr *l3addr) 2599{ 2600 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2601 struct ifnet *ifp = llt->llt_ifp; 2602 struct llentry *lle; 2603 struct llentries *lleh; 2604 u_int hashkey; 2605 2606 IF_AFDATA_LOCK_ASSERT(ifp); 2607 KASSERT(l3addr->sa_family == AF_INET6, 2608 ("sin_family %d", l3addr->sa_family)); 2609 2610 hashkey = sin6->sin6_addr.s6_addr32[3]; 2611 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 2612 LIST_FOREACH(lle, lleh, lle_next) { 2613 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle); 2614 if (lle->la_flags & LLE_DELETED) 2615 continue; 2616 if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr, 2617 sizeof(struct in6_addr)) == 0) 2618 break; 2619 } 2620 2621 if (lle == NULL) { 2622 if (!(flags & LLE_CREATE)) 2623 return (NULL); 2624 IF_AFDATA_WLOCK_ASSERT(ifp); 2625 /* 2626 * A route that covers the given address must have 2627 * been installed 1st because we are doing a resolution, 2628 * verify this. 2629 */ 2630 if (!(flags & LLE_IFADDR) && 2631 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2632 return NULL; 2633 2634 lle = in6_lltable_new(l3addr, flags); 2635 if (lle == NULL) { 2636 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2637 return NULL; 2638 } 2639 lle->la_flags = flags & ~LLE_CREATE; 2640 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 2641 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 2642 lle->la_flags |= (LLE_VALID | LLE_STATIC); 2643 } 2644 2645 lle->lle_tbl = llt; 2646 lle->lle_head = lleh; 2647 lle->la_flags |= LLE_LINKED; 2648 LIST_INSERT_HEAD(lleh, lle, lle_next); 2649 } else if (flags & LLE_DELETE) { 2650 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 2651 LLE_WLOCK(lle); 2652 lle->la_flags |= LLE_DELETED; 2653 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_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