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("$FreeBSD$"); 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/eventhandler.h> 72 #include <sys/errno.h> 73 #include <sys/jail.h> 74 #include <sys/malloc.h> 75 #include <sys/socket.h> 76 #include <sys/socketvar.h> 77 #include <sys/sockio.h> 78 #include <sys/systm.h> 79 #include <sys/priv.h> 80 #include <sys/proc.h> 81 #include <sys/time.h> 82 #include <sys/kernel.h> 83 #include <sys/lock.h> 84 #include <sys/rmlock.h> 85 #include <sys/syslog.h> 86 87 #include <net/if.h> 88 #include <net/if_var.h> 89 #include <net/if_types.h> 90 #include <net/route.h> 91 #include <net/if_dl.h> 92 #include <net/vnet.h> 93 94 #include <netinet/in.h> 95 #include <netinet/in_var.h> 96 #include <net/if_llatbl.h> 97 #include <netinet/if_ether.h> 98 #include <netinet/in_systm.h> 99 #include <netinet/ip.h> 100 #include <netinet/in_pcb.h> 101 #include <netinet/ip_carp.h> 102 103 #include <netinet/ip6.h> 104 #include <netinet6/ip6_var.h> 105 #include <netinet6/nd6.h> 106 #include <netinet6/mld6_var.h> 107 #include <netinet6/ip6_mroute.h> 108 #include <netinet6/in6_ifattach.h> 109 #include <netinet6/scope6_var.h> 110 #include <netinet6/in6_pcb.h> 111 112 VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix); 113 #define V_icmp6_nodeinfo_oldmcprefix VNET(icmp6_nodeinfo_oldmcprefix) 114 115 /* 116 * Definitions of some costant IP6 addresses. 117 */ 118 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 119 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 120 const struct in6_addr in6addr_nodelocal_allnodes = 121 IN6ADDR_NODELOCAL_ALLNODES_INIT; 122 const struct in6_addr in6addr_linklocal_allnodes = 123 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 124 const struct in6_addr in6addr_linklocal_allrouters = 125 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 126 const struct in6_addr in6addr_linklocal_allv2routers = 127 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT; 128 129 const struct in6_addr in6mask0 = IN6MASK0; 130 const struct in6_addr in6mask32 = IN6MASK32; 131 const struct in6_addr in6mask64 = IN6MASK64; 132 const struct in6_addr in6mask96 = IN6MASK96; 133 const struct in6_addr in6mask128 = IN6MASK128; 134 135 const struct sockaddr_in6 sa6_any = 136 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 }; 137 138 static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *, 139 struct in6_aliasreq *, int); 140 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 141 142 static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *, 143 struct in6_ifaddr *, int); 144 static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *, 145 struct in6_aliasreq *, int flags); 146 static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *, 147 struct in6_ifaddr *, int, int); 148 static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *, 149 struct in6_ifaddr *, int); 150 151 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 152 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 153 154 155 void 156 in6_newaddrmsg(struct in6_ifaddr *ia, int cmd) 157 { 158 struct sockaddr_dl gateway; 159 struct sockaddr_in6 mask, addr; 160 struct rtentry rt; 161 162 /* 163 * initialize for rtmsg generation 164 */ 165 bzero(&gateway, sizeof(gateway)); 166 gateway.sdl_len = sizeof(gateway); 167 gateway.sdl_family = AF_LINK; 168 169 bzero(&rt, sizeof(rt)); 170 rt.rt_gateway = (struct sockaddr *)&gateway; 171 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 172 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr)); 173 rt_mask(&rt) = (struct sockaddr *)&mask; 174 rt_key(&rt) = (struct sockaddr *)&addr; 175 rt.rt_flags = RTF_HOST | RTF_STATIC; 176 if (cmd == RTM_ADD) 177 rt.rt_flags |= RTF_UP; 178 /* Announce arrival of local address to all FIBs. */ 179 rt_newaddrmsg(cmd, &ia->ia_ifa, 0, &rt); 180 } 181 182 int 183 in6_mask2len(struct in6_addr *mask, u_char *lim0) 184 { 185 int x = 0, y; 186 u_char *lim = lim0, *p; 187 188 /* ignore the scope_id part */ 189 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 190 lim = (u_char *)mask + sizeof(*mask); 191 for (p = (u_char *)mask; p < lim; x++, p++) { 192 if (*p != 0xff) 193 break; 194 } 195 y = 0; 196 if (p < lim) { 197 for (y = 0; y < 8; y++) { 198 if ((*p & (0x80 >> y)) == 0) 199 break; 200 } 201 } 202 203 /* 204 * when the limit pointer is given, do a stricter check on the 205 * remaining bits. 206 */ 207 if (p < lim) { 208 if (y != 0 && (*p & (0x00ff >> y)) != 0) 209 return (-1); 210 for (p = p + 1; p < lim; p++) 211 if (*p != 0) 212 return (-1); 213 } 214 215 return x * 8 + y; 216 } 217 218 #ifdef COMPAT_FREEBSD32 219 struct in6_ndifreq32 { 220 char ifname[IFNAMSIZ]; 221 uint32_t ifindex; 222 }; 223 #define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32) 224 #endif 225 226 int 227 in6_control(struct socket *so, u_long cmd, caddr_t data, 228 struct ifnet *ifp, struct thread *td) 229 { 230 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 231 struct in6_ifaddr *ia = NULL; 232 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 233 struct sockaddr_in6 *sa6; 234 int carp_attached = 0; 235 int error; 236 u_long ocmd = cmd; 237 238 /* 239 * Compat to make pre-10.x ifconfig(8) operable. 240 */ 241 if (cmd == OSIOCAIFADDR_IN6) 242 cmd = SIOCAIFADDR_IN6; 243 244 switch (cmd) { 245 case SIOCGETSGCNT_IN6: 246 case SIOCGETMIFCNT_IN6: 247 /* 248 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c. 249 * We cannot see how that would be needed, so do not adjust the 250 * KPI blindly; more likely should clean up the IPv4 variant. 251 */ 252 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP); 253 } 254 255 switch (cmd) { 256 case SIOCAADDRCTL_POLICY: 257 case SIOCDADDRCTL_POLICY: 258 if (td != NULL) { 259 error = priv_check(td, PRIV_NETINET_ADDRCTRL6); 260 if (error) 261 return (error); 262 } 263 return (in6_src_ioctl(cmd, data)); 264 } 265 266 if (ifp == NULL) 267 return (EOPNOTSUPP); 268 269 switch (cmd) { 270 case SIOCSNDFLUSH_IN6: 271 case SIOCSPFXFLUSH_IN6: 272 case SIOCSRTRFLUSH_IN6: 273 case SIOCSDEFIFACE_IN6: 274 case SIOCSIFINFO_FLAGS: 275 case SIOCSIFINFO_IN6: 276 if (td != NULL) { 277 error = priv_check(td, PRIV_NETINET_ND6); 278 if (error) 279 return (error); 280 } 281 /* FALLTHROUGH */ 282 case OSIOCGIFINFO_IN6: 283 case SIOCGIFINFO_IN6: 284 case SIOCGDRLST_IN6: 285 case SIOCGPRLST_IN6: 286 case SIOCGNBRINFO_IN6: 287 case SIOCGDEFIFACE_IN6: 288 return (nd6_ioctl(cmd, data, ifp)); 289 290 #ifdef COMPAT_FREEBSD32 291 case SIOCGDEFIFACE32_IN6: 292 { 293 struct in6_ndifreq ndif; 294 struct in6_ndifreq32 *ndif32; 295 296 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif, 297 ifp); 298 if (error) 299 return (error); 300 ndif32 = (struct in6_ndifreq32 *)data; 301 ndif32->ifindex = ndif.ifindex; 302 return (0); 303 } 304 #endif 305 } 306 307 switch (cmd) { 308 case SIOCSIFPREFIX_IN6: 309 case SIOCDIFPREFIX_IN6: 310 case SIOCAIFPREFIX_IN6: 311 case SIOCCIFPREFIX_IN6: 312 case SIOCSGIFPREFIX_IN6: 313 case SIOCGIFPREFIX_IN6: 314 log(LOG_NOTICE, 315 "prefix ioctls are now invalidated. " 316 "please use ifconfig.\n"); 317 return (EOPNOTSUPP); 318 } 319 320 switch (cmd) { 321 case SIOCSSCOPE6: 322 if (td != NULL) { 323 error = priv_check(td, PRIV_NETINET_SCOPE6); 324 if (error) 325 return (error); 326 } 327 /* FALLTHROUGH */ 328 case SIOCGSCOPE6: 329 case SIOCGSCOPE6DEF: 330 return (scope6_ioctl(cmd, data, ifp)); 331 } 332 333 /* 334 * Find address for this interface, if it exists. 335 * 336 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 337 * only, and used the first interface address as the target of other 338 * operations (without checking ifra_addr). This was because netinet 339 * code/API assumed at most 1 interface address per interface. 340 * Since IPv6 allows a node to assign multiple addresses 341 * on a single interface, we almost always look and check the 342 * presence of ifra_addr, and reject invalid ones here. 343 * It also decreases duplicated code among SIOC*_IN6 operations. 344 */ 345 switch (cmd) { 346 case SIOCAIFADDR_IN6: 347 case SIOCSIFPHYADDR_IN6: 348 sa6 = &ifra->ifra_addr; 349 break; 350 case SIOCSIFADDR_IN6: 351 case SIOCGIFADDR_IN6: 352 case SIOCSIFDSTADDR_IN6: 353 case SIOCSIFNETMASK_IN6: 354 case SIOCGIFDSTADDR_IN6: 355 case SIOCGIFNETMASK_IN6: 356 case SIOCDIFADDR_IN6: 357 case SIOCGIFPSRCADDR_IN6: 358 case SIOCGIFPDSTADDR_IN6: 359 case SIOCGIFAFLAG_IN6: 360 case SIOCSNDFLUSH_IN6: 361 case SIOCSPFXFLUSH_IN6: 362 case SIOCSRTRFLUSH_IN6: 363 case SIOCGIFALIFETIME_IN6: 364 case SIOCSIFALIFETIME_IN6: 365 case SIOCGIFSTAT_IN6: 366 case SIOCGIFSTAT_ICMP6: 367 sa6 = &ifr->ifr_addr; 368 break; 369 case SIOCSIFADDR: 370 case SIOCSIFBRDADDR: 371 case SIOCSIFDSTADDR: 372 case SIOCSIFNETMASK: 373 /* 374 * Although we should pass any non-INET6 ioctl requests 375 * down to driver, we filter some legacy INET requests. 376 * Drivers trust SIOCSIFADDR et al to come from an already 377 * privileged layer, and do not perform any credentials 378 * checks or input validation. 379 */ 380 return (EINVAL); 381 default: 382 sa6 = NULL; 383 break; 384 } 385 if (sa6 && sa6->sin6_family == AF_INET6) { 386 if (sa6->sin6_scope_id != 0) 387 error = sa6_embedscope(sa6, 0); 388 else 389 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 390 if (error != 0) 391 return (error); 392 if (td != NULL && (error = prison_check_ip6(td->td_ucred, 393 &sa6->sin6_addr)) != 0) 394 return (error); 395 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 396 } else 397 ia = NULL; 398 399 switch (cmd) { 400 case SIOCSIFADDR_IN6: 401 case SIOCSIFDSTADDR_IN6: 402 case SIOCSIFNETMASK_IN6: 403 /* 404 * Since IPv6 allows a node to assign multiple addresses 405 * on a single interface, SIOCSIFxxx ioctls are deprecated. 406 */ 407 /* we decided to obsolete this command (20000704) */ 408 error = EINVAL; 409 goto out; 410 411 case SIOCDIFADDR_IN6: 412 /* 413 * for IPv4, we look for existing in_ifaddr here to allow 414 * "ifconfig if0 delete" to remove the first IPv4 address on 415 * the interface. For IPv6, as the spec allows multiple 416 * interface address from the day one, we consider "remove the 417 * first one" semantics to be not preferable. 418 */ 419 if (ia == NULL) { 420 error = EADDRNOTAVAIL; 421 goto out; 422 } 423 /* FALLTHROUGH */ 424 case SIOCAIFADDR_IN6: 425 /* 426 * We always require users to specify a valid IPv6 address for 427 * the corresponding operation. 428 */ 429 if (ifra->ifra_addr.sin6_family != AF_INET6 || 430 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 431 error = EAFNOSUPPORT; 432 goto out; 433 } 434 435 if (td != NULL) { 436 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 437 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR); 438 if (error) 439 goto out; 440 } 441 /* FALLTHROUGH */ 442 case SIOCGIFSTAT_IN6: 443 case SIOCGIFSTAT_ICMP6: 444 if (ifp->if_afdata[AF_INET6] == NULL) { 445 error = EPFNOSUPPORT; 446 goto out; 447 } 448 break; 449 450 case SIOCGIFADDR_IN6: 451 /* This interface is basically deprecated. use SIOCGIFCONF. */ 452 /* FALLTHROUGH */ 453 case SIOCGIFAFLAG_IN6: 454 case SIOCGIFNETMASK_IN6: 455 case SIOCGIFDSTADDR_IN6: 456 case SIOCGIFALIFETIME_IN6: 457 /* must think again about its semantics */ 458 if (ia == NULL) { 459 error = EADDRNOTAVAIL; 460 goto out; 461 } 462 break; 463 464 case SIOCSIFALIFETIME_IN6: 465 { 466 struct in6_addrlifetime *lt; 467 468 if (td != NULL) { 469 error = priv_check(td, PRIV_NETINET_ALIFETIME6); 470 if (error) 471 goto out; 472 } 473 if (ia == NULL) { 474 error = EADDRNOTAVAIL; 475 goto out; 476 } 477 /* sanity for overflow - beware unsigned */ 478 lt = &ifr->ifr_ifru.ifru_lifetime; 479 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME && 480 lt->ia6t_vltime + time_uptime < time_uptime) { 481 error = EINVAL; 482 goto out; 483 } 484 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME && 485 lt->ia6t_pltime + time_uptime < time_uptime) { 486 error = EINVAL; 487 goto out; 488 } 489 break; 490 } 491 } 492 493 switch (cmd) { 494 case SIOCGIFADDR_IN6: 495 ifr->ifr_addr = ia->ia_addr; 496 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 497 goto out; 498 break; 499 500 case SIOCGIFDSTADDR_IN6: 501 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 502 error = EINVAL; 503 goto out; 504 } 505 /* 506 * XXX: should we check if ifa_dstaddr is NULL and return 507 * an error? 508 */ 509 ifr->ifr_dstaddr = ia->ia_dstaddr; 510 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 511 goto out; 512 break; 513 514 case SIOCGIFNETMASK_IN6: 515 ifr->ifr_addr = ia->ia_prefixmask; 516 break; 517 518 case SIOCGIFAFLAG_IN6: 519 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 520 break; 521 522 case SIOCGIFSTAT_IN6: 523 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 524 ifp->if_afdata[AF_INET6])->in6_ifstat, 525 &ifr->ifr_ifru.ifru_stat, 526 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 527 break; 528 529 case SIOCGIFSTAT_ICMP6: 530 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 531 ifp->if_afdata[AF_INET6])->icmp6_ifstat, 532 &ifr->ifr_ifru.ifru_icmp6stat, 533 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 534 break; 535 536 case SIOCGIFALIFETIME_IN6: 537 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 538 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 539 time_t maxexpire; 540 struct in6_addrlifetime *retlt = 541 &ifr->ifr_ifru.ifru_lifetime; 542 543 /* 544 * XXX: adjust expiration time assuming time_t is 545 * signed. 546 */ 547 maxexpire = (-1) & 548 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 549 if (ia->ia6_lifetime.ia6t_vltime < 550 maxexpire - ia->ia6_updatetime) { 551 retlt->ia6t_expire = ia->ia6_updatetime + 552 ia->ia6_lifetime.ia6t_vltime; 553 } else 554 retlt->ia6t_expire = maxexpire; 555 } 556 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 557 time_t maxexpire; 558 struct in6_addrlifetime *retlt = 559 &ifr->ifr_ifru.ifru_lifetime; 560 561 /* 562 * XXX: adjust expiration time assuming time_t is 563 * signed. 564 */ 565 maxexpire = (-1) & 566 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 567 if (ia->ia6_lifetime.ia6t_pltime < 568 maxexpire - ia->ia6_updatetime) { 569 retlt->ia6t_preferred = ia->ia6_updatetime + 570 ia->ia6_lifetime.ia6t_pltime; 571 } else 572 retlt->ia6t_preferred = maxexpire; 573 } 574 break; 575 576 case SIOCSIFALIFETIME_IN6: 577 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; 578 /* for sanity */ 579 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 580 ia->ia6_lifetime.ia6t_expire = 581 time_uptime + ia->ia6_lifetime.ia6t_vltime; 582 } else 583 ia->ia6_lifetime.ia6t_expire = 0; 584 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 585 ia->ia6_lifetime.ia6t_preferred = 586 time_uptime + ia->ia6_lifetime.ia6t_pltime; 587 } else 588 ia->ia6_lifetime.ia6t_preferred = 0; 589 break; 590 591 case SIOCAIFADDR_IN6: 592 { 593 struct nd_prefixctl pr0; 594 struct nd_prefix *pr; 595 596 /* 597 * first, make or update the interface address structure, 598 * and link it to the list. 599 */ 600 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 601 goto out; 602 if (ia != NULL) 603 ifa_free(&ia->ia_ifa); 604 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 605 == NULL) { 606 /* 607 * this can happen when the user specify the 0 valid 608 * lifetime. 609 */ 610 break; 611 } 612 613 if (cmd == ocmd && ifra->ifra_vhid > 0) { 614 if (carp_attach_p != NULL) 615 error = (*carp_attach_p)(&ia->ia_ifa, 616 ifra->ifra_vhid); 617 else 618 error = EPROTONOSUPPORT; 619 if (error) 620 goto out; 621 else 622 carp_attached = 1; 623 } 624 625 /* 626 * then, make the prefix on-link on the interface. 627 * XXX: we'd rather create the prefix before the address, but 628 * we need at least one address to install the corresponding 629 * interface route, so we configure the address first. 630 */ 631 632 /* 633 * convert mask to prefix length (prefixmask has already 634 * been validated in in6_update_ifa(). 635 */ 636 bzero(&pr0, sizeof(pr0)); 637 pr0.ndpr_ifp = ifp; 638 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 639 NULL); 640 if (pr0.ndpr_plen == 128) { 641 /* we don't need to install a host route. */ 642 goto aifaddr_out; 643 } 644 pr0.ndpr_prefix = ifra->ifra_addr; 645 /* apply the mask for safety. */ 646 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, 647 &ifra->ifra_prefixmask.sin6_addr); 648 649 /* 650 * XXX: since we don't have an API to set prefix (not address) 651 * lifetimes, we just use the same lifetimes as addresses. 652 * The (temporarily) installed lifetimes can be overridden by 653 * later advertised RAs (when accept_rtadv is non 0), which is 654 * an intended behavior. 655 */ 656 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 657 pr0.ndpr_raf_auto = 658 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 659 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 660 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 661 662 /* add the prefix if not yet. */ 663 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 664 /* 665 * nd6_prelist_add will install the corresponding 666 * interface route. 667 */ 668 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) { 669 if (carp_attached) 670 (*carp_detach_p)(&ia->ia_ifa); 671 goto out; 672 } 673 if (pr == NULL) { 674 if (carp_attached) 675 (*carp_detach_p)(&ia->ia_ifa); 676 log(LOG_ERR, "nd6_prelist_add succeeded but " 677 "no prefix\n"); 678 error = EINVAL; 679 goto out; 680 } 681 } 682 683 /* relate the address to the prefix */ 684 if (ia->ia6_ndpr == NULL) { 685 ia->ia6_ndpr = pr; 686 pr->ndpr_refcnt++; 687 688 /* 689 * If this is the first autoconf address from the 690 * prefix, create a temporary address as well 691 * (when required). 692 */ 693 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 694 V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) { 695 int e; 696 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 697 log(LOG_NOTICE, "in6_control: failed " 698 "to create a temporary address, " 699 "errno=%d\n", e); 700 } 701 } 702 } 703 704 /* 705 * this might affect the status of autoconfigured addresses, 706 * that is, this address might make other addresses detached. 707 */ 708 pfxlist_onlink_check(); 709 aifaddr_out: 710 if (error != 0 || ia == NULL) 711 break; 712 /* 713 * Try to clear the flag when a new IPv6 address is added 714 * onto an IFDISABLED interface and it succeeds. 715 */ 716 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) { 717 struct in6_ndireq nd; 718 719 memset(&nd, 0, sizeof(nd)); 720 nd.ndi.flags = ND_IFINFO(ifp)->flags; 721 nd.ndi.flags &= ~ND6_IFF_IFDISABLED; 722 if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0) 723 log(LOG_NOTICE, "SIOCAIFADDR_IN6: " 724 "SIOCSIFINFO_FLAGS for -ifdisabled " 725 "failed."); 726 /* 727 * Ignore failure of clearing the flag intentionally. 728 * The failure means address duplication was detected. 729 */ 730 } 731 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 732 break; 733 } 734 735 case SIOCDIFADDR_IN6: 736 { 737 struct nd_prefix *pr; 738 739 /* 740 * If the address being deleted is the only one that owns 741 * the corresponding prefix, expire the prefix as well. 742 * XXX: theoretically, we don't have to worry about such 743 * relationship, since we separate the address management 744 * and the prefix management. We do this, however, to provide 745 * as much backward compatibility as possible in terms of 746 * the ioctl operation. 747 * Note that in6_purgeaddr() will decrement ndpr_refcnt. 748 */ 749 pr = ia->ia6_ndpr; 750 in6_purgeaddr(&ia->ia_ifa); 751 if (pr && pr->ndpr_refcnt == 0) 752 prelist_remove(pr); 753 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 754 break; 755 } 756 757 default: 758 if (ifp->if_ioctl == NULL) { 759 error = EOPNOTSUPP; 760 goto out; 761 } 762 error = (*ifp->if_ioctl)(ifp, cmd, data); 763 goto out; 764 } 765 766 error = 0; 767 out: 768 if (ia != NULL) 769 ifa_free(&ia->ia_ifa); 770 return (error); 771 } 772 773 774 /* 775 * Join necessary multicast groups. Factored out from in6_update_ifa(). 776 * This entire work should only be done once, for the default FIB. 777 */ 778 static int 779 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra, 780 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol) 781 { 782 char ip6buf[INET6_ADDRSTRLEN]; 783 struct in6_addr mltaddr; 784 struct in6_multi_mship *imm; 785 int delay, error; 786 787 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__)); 788 789 /* Join solicited multicast addr for new host id. */ 790 bzero(&mltaddr, sizeof(struct in6_addr)); 791 mltaddr.s6_addr32[0] = IPV6_ADDR_INT32_MLL; 792 mltaddr.s6_addr32[2] = htonl(1); 793 mltaddr.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 794 mltaddr.s6_addr8[12] = 0xff; 795 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) { 796 /* XXX: should not happen */ 797 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 798 goto cleanup; 799 } 800 delay = error = 0; 801 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 802 /* 803 * We need a random delay for DAD on the address being 804 * configured. It also means delaying transmission of the 805 * corresponding MLD report to avoid report collision. 806 * [RFC 4861, Section 6.3.7] 807 */ 808 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 809 } 810 imm = in6_joingroup(ifp, &mltaddr, &error, delay); 811 if (imm == NULL) { 812 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 813 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 814 if_name(ifp), error)); 815 goto cleanup; 816 } 817 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 818 *in6m_sol = imm->i6mm_maddr; 819 820 /* 821 * Join link-local all-nodes address. 822 */ 823 mltaddr = in6addr_linklocal_allnodes; 824 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 825 goto cleanup; /* XXX: should not fail */ 826 827 imm = in6_joingroup(ifp, &mltaddr, &error, 0); 828 if (imm == NULL) { 829 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 830 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 831 if_name(ifp), error)); 832 goto cleanup; 833 } 834 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 835 836 /* 837 * Join node information group address. 838 */ 839 delay = 0; 840 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 841 /* 842 * The spec does not say anything about delay for this group, 843 * but the same logic should apply. 844 */ 845 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 846 } 847 if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) { 848 /* XXX jinmei */ 849 imm = in6_joingroup(ifp, &mltaddr, &error, delay); 850 if (imm == NULL) 851 nd6log((LOG_WARNING, 852 "%s: in6_joingroup failed for %s on %s " 853 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 854 &mltaddr), if_name(ifp), error)); 855 /* XXX not very fatal, go on... */ 856 else 857 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 858 } 859 if (V_icmp6_nodeinfo_oldmcprefix && 860 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) { 861 imm = in6_joingroup(ifp, &mltaddr, &error, delay); 862 if (imm == NULL) 863 nd6log((LOG_WARNING, 864 "%s: in6_joingroup failed for %s on %s " 865 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 866 &mltaddr), if_name(ifp), error)); 867 /* XXX not very fatal, go on... */ 868 else 869 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 870 } 871 872 /* 873 * Join interface-local all-nodes address. 874 * (ff01::1%ifN, and ff01::%ifN/32) 875 */ 876 mltaddr = in6addr_nodelocal_allnodes; 877 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 878 goto cleanup; /* XXX: should not fail */ 879 880 imm = in6_joingroup(ifp, &mltaddr, &error, 0); 881 if (imm == NULL) { 882 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 883 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 884 &mltaddr), if_name(ifp), error)); 885 goto cleanup; 886 } 887 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 888 889 cleanup: 890 return (error); 891 } 892 893 /* 894 * Update parameters of an IPv6 interface address. 895 * If necessary, a new entry is created and linked into address chains. 896 * This function is separated from in6_control(). 897 */ 898 int 899 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 900 struct in6_ifaddr *ia, int flags) 901 { 902 int error, hostIsNew = 0; 903 904 if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0) 905 return (error); 906 907 if (ia == NULL) { 908 hostIsNew = 1; 909 if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL) 910 return (ENOBUFS); 911 } 912 913 error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags); 914 if (error != 0) { 915 if (hostIsNew != 0) { 916 in6_unlink_ifa(ia, ifp); 917 ifa_free(&ia->ia_ifa); 918 } 919 return (error); 920 } 921 922 if (hostIsNew) 923 error = in6_broadcast_ifa(ifp, ifra, ia, flags); 924 925 return (error); 926 } 927 928 /* 929 * Fill in basic IPv6 address request info. 930 */ 931 void 932 in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr, 933 const struct in6_addr *mask) 934 { 935 936 memset(ifra, 0, sizeof(struct in6_aliasreq)); 937 938 ifra->ifra_addr.sin6_family = AF_INET6; 939 ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 940 if (addr != NULL) 941 ifra->ifra_addr.sin6_addr = *addr; 942 943 ifra->ifra_prefixmask.sin6_family = AF_INET6; 944 ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 945 if (mask != NULL) 946 ifra->ifra_prefixmask.sin6_addr = *mask; 947 } 948 949 static int 950 in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra, 951 struct in6_ifaddr *ia, int flags) 952 { 953 int plen = -1; 954 struct sockaddr_in6 dst6; 955 struct in6_addrlifetime *lt; 956 char ip6buf[INET6_ADDRSTRLEN]; 957 958 /* Validate parameters */ 959 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 960 return (EINVAL); 961 962 /* 963 * The destination address for a p2p link must have a family 964 * of AF_UNSPEC or AF_INET6. 965 */ 966 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 967 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 968 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 969 return (EAFNOSUPPORT); 970 971 /* 972 * Validate address 973 */ 974 if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) || 975 ifra->ifra_addr.sin6_family != AF_INET6) 976 return (EINVAL); 977 978 /* 979 * validate ifra_prefixmask. don't check sin6_family, netmask 980 * does not carry fields other than sin6_len. 981 */ 982 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 983 return (EINVAL); 984 /* 985 * Because the IPv6 address architecture is classless, we require 986 * users to specify a (non 0) prefix length (mask) for a new address. 987 * We also require the prefix (when specified) mask is valid, and thus 988 * reject a non-consecutive mask. 989 */ 990 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 991 return (EINVAL); 992 if (ifra->ifra_prefixmask.sin6_len != 0) { 993 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 994 (u_char *)&ifra->ifra_prefixmask + 995 ifra->ifra_prefixmask.sin6_len); 996 if (plen <= 0) 997 return (EINVAL); 998 } else { 999 /* 1000 * In this case, ia must not be NULL. We just use its prefix 1001 * length. 1002 */ 1003 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1004 } 1005 /* 1006 * If the destination address on a p2p interface is specified, 1007 * and the address is a scoped one, validate/set the scope 1008 * zone identifier. 1009 */ 1010 dst6 = ifra->ifra_dstaddr; 1011 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 1012 (dst6.sin6_family == AF_INET6)) { 1013 struct in6_addr in6_tmp; 1014 u_int32_t zoneid; 1015 1016 in6_tmp = dst6.sin6_addr; 1017 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 1018 return (EINVAL); /* XXX: should be impossible */ 1019 1020 if (dst6.sin6_scope_id != 0) { 1021 if (dst6.sin6_scope_id != zoneid) 1022 return (EINVAL); 1023 } else /* user omit to specify the ID. */ 1024 dst6.sin6_scope_id = zoneid; 1025 1026 /* convert into the internal form */ 1027 if (sa6_embedscope(&dst6, 0)) 1028 return (EINVAL); /* XXX: should be impossible */ 1029 } 1030 /* Modify original ifra_dstaddr to reflect changes */ 1031 ifra->ifra_dstaddr = dst6; 1032 1033 /* 1034 * The destination address can be specified only for a p2p or a 1035 * loopback interface. If specified, the corresponding prefix length 1036 * must be 128. 1037 */ 1038 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 1039 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 1040 /* XXX: noisy message */ 1041 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 1042 "be specified for a p2p or a loopback IF only\n")); 1043 return (EINVAL); 1044 } 1045 if (plen != 128) { 1046 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 1047 "be 128 when dstaddr is specified\n")); 1048 return (EINVAL); 1049 } 1050 } 1051 /* lifetime consistency check */ 1052 lt = &ifra->ifra_lifetime; 1053 if (lt->ia6t_pltime > lt->ia6t_vltime) 1054 return (EINVAL); 1055 if (lt->ia6t_vltime == 0) { 1056 /* 1057 * the following log might be noisy, but this is a typical 1058 * configuration mistake or a tool's bug. 1059 */ 1060 nd6log((LOG_INFO, 1061 "in6_update_ifa: valid lifetime is 0 for %s\n", 1062 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr))); 1063 1064 if (ia == NULL) 1065 return (0); /* there's nothing to do */ 1066 } 1067 1068 /* Check prefix mask */ 1069 if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) { 1070 /* 1071 * We prohibit changing the prefix length of an existing 1072 * address, because 1073 * + such an operation should be rare in IPv6, and 1074 * + the operation would confuse prefix management. 1075 */ 1076 if (ia->ia_prefixmask.sin6_len != 0 && 1077 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 1078 nd6log((LOG_INFO, "in6_validate_ifa: the prefix length " 1079 "of an existing %s address should not be changed\n", 1080 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1081 1082 return (EINVAL); 1083 } 1084 } 1085 1086 return (0); 1087 } 1088 1089 1090 /* 1091 * Allocate a new ifaddr and link it into chains. 1092 */ 1093 static struct in6_ifaddr * 1094 in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags) 1095 { 1096 struct in6_ifaddr *ia; 1097 1098 /* 1099 * When in6_alloc_ifa() is called in a process of a received 1100 * RA, it is called under an interrupt context. So, we should 1101 * call malloc with M_NOWAIT. 1102 */ 1103 ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT); 1104 if (ia == NULL) 1105 return (NULL); 1106 LIST_INIT(&ia->ia6_memberships); 1107 /* Initialize the address and masks, and put time stamp */ 1108 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1109 ia->ia_addr.sin6_family = AF_INET6; 1110 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 1111 /* XXX: Can we assign ,sin6_addr and skip the rest? */ 1112 ia->ia_addr = ifra->ifra_addr; 1113 ia->ia6_createtime = time_uptime; 1114 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1115 /* 1116 * Some functions expect that ifa_dstaddr is not 1117 * NULL for p2p interfaces. 1118 */ 1119 ia->ia_ifa.ifa_dstaddr = 1120 (struct sockaddr *)&ia->ia_dstaddr; 1121 } else { 1122 ia->ia_ifa.ifa_dstaddr = NULL; 1123 } 1124 1125 /* set prefix mask if any */ 1126 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 1127 if (ifra->ifra_prefixmask.sin6_len != 0) { 1128 ia->ia_prefixmask.sin6_family = AF_INET6; 1129 ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len; 1130 ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr; 1131 } 1132 1133 ia->ia_ifp = ifp; 1134 ifa_ref(&ia->ia_ifa); /* if_addrhead */ 1135 IF_ADDR_WLOCK(ifp); 1136 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1137 IF_ADDR_WUNLOCK(ifp); 1138 1139 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */ 1140 IN6_IFADDR_WLOCK(); 1141 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link); 1142 LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash); 1143 IN6_IFADDR_WUNLOCK(); 1144 1145 return (ia); 1146 } 1147 1148 /* 1149 * Update/configure interface address parameters: 1150 * 1151 * 1) Update lifetime 1152 * 2) Update interface metric ad flags 1153 * 3) Notify other subsystems 1154 */ 1155 static int 1156 in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra, 1157 struct in6_ifaddr *ia, int hostIsNew, int flags) 1158 { 1159 int error; 1160 1161 /* update timestamp */ 1162 ia->ia6_updatetime = time_uptime; 1163 1164 /* 1165 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1166 * to see if the address is deprecated or invalidated, but initialize 1167 * these members for applications. 1168 */ 1169 ia->ia6_lifetime = ifra->ifra_lifetime; 1170 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1171 ia->ia6_lifetime.ia6t_expire = 1172 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1173 } else 1174 ia->ia6_lifetime.ia6t_expire = 0; 1175 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1176 ia->ia6_lifetime.ia6t_preferred = 1177 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1178 } else 1179 ia->ia6_lifetime.ia6t_preferred = 0; 1180 1181 /* 1182 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1183 * userland, make it deprecated. 1184 */ 1185 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1186 ia->ia6_lifetime.ia6t_pltime = 0; 1187 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1188 } 1189 1190 /* 1191 * configure address flags. 1192 */ 1193 ia->ia6_flags = ifra->ifra_flags; 1194 1195 /* 1196 * Make the address tentative before joining multicast addresses, 1197 * so that corresponding MLD responses would not have a tentative 1198 * source address. 1199 */ 1200 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1201 if (hostIsNew && in6if_do_dad(ifp)) 1202 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1203 1204 /* DAD should be performed after ND6_IFF_IFDISABLED is cleared. */ 1205 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1206 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1207 1208 /* notify other subsystems */ 1209 error = in6_notify_ifa(ifp, ia, ifra, hostIsNew); 1210 1211 return (error); 1212 } 1213 1214 /* 1215 * Do link-level ifa job: 1216 * 1) Add lle entry for added address 1217 * 2) Notifies routing socket users about new address 1218 * 3) join appropriate multicast group 1219 * 4) start DAD if enabled 1220 */ 1221 static int 1222 in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1223 struct in6_ifaddr *ia, int flags) 1224 { 1225 struct in6_multi *in6m_sol; 1226 int error = 0; 1227 1228 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1229 if ((error = nd6_add_ifa_lle(ia)) != 0) { 1230 in6_purgeaddr(&ia->ia_ifa); 1231 ifa_free(&ia->ia_ifa); 1232 return (error); 1233 } 1234 1235 /* Join necessary multicast groups. */ 1236 in6m_sol = NULL; 1237 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1238 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol); 1239 if (error != 0) { 1240 in6_purgeaddr(&ia->ia_ifa); 1241 ifa_free(&ia->ia_ifa); 1242 return (error); 1243 } 1244 } 1245 1246 /* 1247 * Perform DAD, if needed. 1248 * XXX It may be of use, if we can administratively disable DAD. 1249 */ 1250 if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && 1251 (ia->ia6_flags & IN6_IFF_TENTATIVE)) 1252 { 1253 int delay, mindelay, maxdelay; 1254 1255 delay = 0; 1256 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1257 /* 1258 * We need to impose a delay before sending an NS 1259 * for DAD. Check if we also needed a delay for the 1260 * corresponding MLD message. If we did, the delay 1261 * should be larger than the MLD delay (this could be 1262 * relaxed a bit, but this simple logic is at least 1263 * safe). 1264 * XXX: Break data hiding guidelines and look at 1265 * state for the solicited multicast group. 1266 */ 1267 mindelay = 0; 1268 if (in6m_sol != NULL && 1269 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) { 1270 mindelay = in6m_sol->in6m_timer; 1271 } 1272 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1273 if (maxdelay - mindelay == 0) 1274 delay = 0; 1275 else { 1276 delay = 1277 (arc4random() % (maxdelay - mindelay)) + 1278 mindelay; 1279 } 1280 } 1281 nd6_dad_start((struct ifaddr *)ia, delay); 1282 } 1283 1284 in6_newaddrmsg(ia, RTM_ADD); 1285 ifa_free(&ia->ia_ifa); 1286 return (error); 1287 } 1288 1289 void 1290 in6_purgeaddr(struct ifaddr *ifa) 1291 { 1292 struct ifnet *ifp = ifa->ifa_ifp; 1293 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1294 struct in6_multi_mship *imm; 1295 int plen, error; 1296 1297 if (ifa->ifa_carp) 1298 (*carp_detach_p)(ifa); 1299 1300 /* 1301 * Remove the loopback route to the interface address. 1302 * The check for the current setting of "nd6_useloopback" 1303 * is not needed. 1304 */ 1305 if (ia->ia_flags & IFA_RTSELF) { 1306 error = ifa_del_loopback_route((struct ifaddr *)ia, 1307 (struct sockaddr *)&ia->ia_addr); 1308 if (error == 0) 1309 ia->ia_flags &= ~IFA_RTSELF; 1310 } 1311 1312 /* stop DAD processing */ 1313 nd6_dad_stop(ifa); 1314 1315 /* Remove local address entry from lltable. */ 1316 nd6_rem_ifa_lle(ia); 1317 1318 /* Leave multicast groups. */ 1319 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1320 LIST_REMOVE(imm, i6mm_chain); 1321 in6_leavegroup(imm); 1322 } 1323 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1324 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) { 1325 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags | 1326 (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0); 1327 if (error != 0) 1328 log(LOG_INFO, "%s: err=%d, destination address delete " 1329 "failed\n", __func__, error); 1330 ia->ia_flags &= ~IFA_ROUTE; 1331 } 1332 1333 in6_newaddrmsg(ia, RTM_DELETE); 1334 in6_unlink_ifa(ia, ifp); 1335 } 1336 1337 static void 1338 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1339 { 1340 char ip6buf[INET6_ADDRSTRLEN]; 1341 1342 IF_ADDR_WLOCK(ifp); 1343 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1344 IF_ADDR_WUNLOCK(ifp); 1345 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1346 1347 /* 1348 * Defer the release of what might be the last reference to the 1349 * in6_ifaddr so that it can't be freed before the remainder of the 1350 * cleanup. 1351 */ 1352 IN6_IFADDR_WLOCK(); 1353 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 1354 LIST_REMOVE(ia, ia6_hash); 1355 IN6_IFADDR_WUNLOCK(); 1356 1357 /* 1358 * Release the reference to the base prefix. There should be a 1359 * positive reference. 1360 */ 1361 if (ia->ia6_ndpr == NULL) { 1362 nd6log((LOG_NOTICE, 1363 "in6_unlink_ifa: autoconf'ed address " 1364 "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia)))); 1365 } else { 1366 ia->ia6_ndpr->ndpr_refcnt--; 1367 ia->ia6_ndpr = NULL; 1368 } 1369 1370 /* 1371 * Also, if the address being removed is autoconf'ed, call 1372 * pfxlist_onlink_check() since the release might affect the status of 1373 * other (detached) addresses. 1374 */ 1375 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1376 pfxlist_onlink_check(); 1377 } 1378 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1379 } 1380 1381 /* 1382 * Notifies other other subsystems about address change/arrival: 1383 * 1) Notifies device handler on first IPv6 address assignment 1384 * 2) Handle routing table changes for P2P links and route 1385 * 3) Handle routing table changes for address host route 1386 */ 1387 static int 1388 in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia, 1389 struct in6_aliasreq *ifra, int hostIsNew) 1390 { 1391 int error = 0, plen, ifacount = 0; 1392 struct ifaddr *ifa; 1393 struct sockaddr_in6 *pdst; 1394 char ip6buf[INET6_ADDRSTRLEN]; 1395 1396 /* 1397 * Give the interface a chance to initialize 1398 * if this is its first address, 1399 */ 1400 if (hostIsNew != 0) { 1401 IF_ADDR_RLOCK(ifp); 1402 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1403 if (ifa->ifa_addr->sa_family != AF_INET6) 1404 continue; 1405 ifacount++; 1406 } 1407 IF_ADDR_RUNLOCK(ifp); 1408 } 1409 1410 if (ifacount <= 1 && ifp->if_ioctl) { 1411 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1412 if (error) 1413 return (error); 1414 } 1415 1416 /* 1417 * If a new destination address is specified, scrub the old one and 1418 * install the new destination. Note that the interface must be 1419 * p2p or loopback. 1420 */ 1421 pdst = &ifra->ifra_dstaddr; 1422 if (pdst->sin6_family == AF_INET6 && 1423 !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1424 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1425 (rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0)) { 1426 nd6log((LOG_ERR, "in6_update_ifa_internal: failed to " 1427 "remove a route to the old destination: %s\n", 1428 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1429 /* proceed anyway... */ 1430 } else 1431 ia->ia_flags &= ~IFA_ROUTE; 1432 ia->ia_dstaddr = *pdst; 1433 } 1434 1435 /* 1436 * If a new destination address is specified for a point-to-point 1437 * interface, install a route to the destination as an interface 1438 * direct route. 1439 * XXX: the logic below rejects assigning multiple addresses on a p2p 1440 * interface that share the same destination. 1441 */ 1442 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1443 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 && 1444 ia->ia_dstaddr.sin6_family == AF_INET6) { 1445 int rtflags = RTF_UP | RTF_HOST; 1446 /* 1447 * Handle the case for ::1 . 1448 */ 1449 if (ifp->if_flags & IFF_LOOPBACK) 1450 ia->ia_flags |= IFA_RTSELF; 1451 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags); 1452 if (error) 1453 return (error); 1454 ia->ia_flags |= IFA_ROUTE; 1455 } 1456 1457 /* 1458 * add a loopback route to self if not exists 1459 */ 1460 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) { 1461 error = ifa_add_loopback_route((struct ifaddr *)ia, 1462 (struct sockaddr *)&ia->ia_addr); 1463 if (error == 0) 1464 ia->ia_flags |= IFA_RTSELF; 1465 } 1466 1467 return (error); 1468 } 1469 1470 /* 1471 * Find an IPv6 interface link-local address specific to an interface. 1472 * ifaddr is returned referenced. 1473 */ 1474 struct in6_ifaddr * 1475 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1476 { 1477 struct ifaddr *ifa; 1478 1479 IF_ADDR_RLOCK(ifp); 1480 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1481 if (ifa->ifa_addr->sa_family != AF_INET6) 1482 continue; 1483 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1484 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1485 ignoreflags) != 0) 1486 continue; 1487 ifa_ref(ifa); 1488 break; 1489 } 1490 } 1491 IF_ADDR_RUNLOCK(ifp); 1492 1493 return ((struct in6_ifaddr *)ifa); 1494 } 1495 1496 1497 /* 1498 * find the internet address corresponding to a given address. 1499 * ifaddr is returned referenced. 1500 */ 1501 struct in6_ifaddr * 1502 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid) 1503 { 1504 struct rm_priotracker in6_ifa_tracker; 1505 struct in6_ifaddr *ia; 1506 1507 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1508 LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) { 1509 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1510 if (zoneid != 0 && 1511 zoneid != ia->ia_addr.sin6_scope_id) 1512 continue; 1513 ifa_ref(&ia->ia_ifa); 1514 break; 1515 } 1516 } 1517 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1518 return (ia); 1519 } 1520 1521 /* 1522 * find the internet address corresponding to a given interface and address. 1523 * ifaddr is returned referenced. 1524 */ 1525 struct in6_ifaddr * 1526 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr) 1527 { 1528 struct ifaddr *ifa; 1529 1530 IF_ADDR_RLOCK(ifp); 1531 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1532 if (ifa->ifa_addr->sa_family != AF_INET6) 1533 continue; 1534 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1535 ifa_ref(ifa); 1536 break; 1537 } 1538 } 1539 IF_ADDR_RUNLOCK(ifp); 1540 1541 return ((struct in6_ifaddr *)ifa); 1542 } 1543 1544 /* 1545 * Find a link-local scoped address on ifp and return it if any. 1546 */ 1547 struct in6_ifaddr * 1548 in6ifa_llaonifp(struct ifnet *ifp) 1549 { 1550 struct sockaddr_in6 *sin6; 1551 struct ifaddr *ifa; 1552 1553 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1554 return (NULL); 1555 if_addr_rlock(ifp); 1556 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1557 if (ifa->ifa_addr->sa_family != AF_INET6) 1558 continue; 1559 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 1560 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 1561 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) || 1562 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr)) 1563 break; 1564 } 1565 if_addr_runlock(ifp); 1566 1567 return ((struct in6_ifaddr *)ifa); 1568 } 1569 1570 /* 1571 * Convert IP6 address to printable (loggable) representation. Caller 1572 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 1573 */ 1574 static char digits[] = "0123456789abcdef"; 1575 char * 1576 ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 1577 { 1578 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0; 1579 char *cp; 1580 const u_int16_t *a = (const u_int16_t *)addr; 1581 const u_int8_t *d; 1582 int dcolon = 0, zero = 0; 1583 1584 cp = ip6buf; 1585 1586 for (i = 0; i < 8; i++) { 1587 if (*(a + i) == 0) { 1588 cnt++; 1589 if (cnt == 1) 1590 idx = i; 1591 } 1592 else if (maxcnt < cnt) { 1593 maxcnt = cnt; 1594 index = idx; 1595 cnt = 0; 1596 } 1597 } 1598 if (maxcnt < cnt) { 1599 maxcnt = cnt; 1600 index = idx; 1601 } 1602 1603 for (i = 0; i < 8; i++) { 1604 if (dcolon == 1) { 1605 if (*a == 0) { 1606 if (i == 7) 1607 *cp++ = ':'; 1608 a++; 1609 continue; 1610 } else 1611 dcolon = 2; 1612 } 1613 if (*a == 0) { 1614 if (dcolon == 0 && *(a + 1) == 0 && i == index) { 1615 if (i == 0) 1616 *cp++ = ':'; 1617 *cp++ = ':'; 1618 dcolon = 1; 1619 } else { 1620 *cp++ = '0'; 1621 *cp++ = ':'; 1622 } 1623 a++; 1624 continue; 1625 } 1626 d = (const u_char *)a; 1627 /* Try to eliminate leading zeros in printout like in :0001. */ 1628 zero = 1; 1629 *cp = digits[*d >> 4]; 1630 if (*cp != '0') { 1631 zero = 0; 1632 cp++; 1633 } 1634 *cp = digits[*d++ & 0xf]; 1635 if (zero == 0 || (*cp != '0')) { 1636 zero = 0; 1637 cp++; 1638 } 1639 *cp = digits[*d >> 4]; 1640 if (zero == 0 || (*cp != '0')) { 1641 zero = 0; 1642 cp++; 1643 } 1644 *cp++ = digits[*d & 0xf]; 1645 *cp++ = ':'; 1646 a++; 1647 } 1648 *--cp = '\0'; 1649 return (ip6buf); 1650 } 1651 1652 int 1653 in6_localaddr(struct in6_addr *in6) 1654 { 1655 struct rm_priotracker in6_ifa_tracker; 1656 struct in6_ifaddr *ia; 1657 1658 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1659 return 1; 1660 1661 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1662 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 1663 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1664 &ia->ia_prefixmask.sin6_addr)) { 1665 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1666 return 1; 1667 } 1668 } 1669 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1670 1671 return (0); 1672 } 1673 1674 /* 1675 * Return 1 if an internet address is for the local host and configured 1676 * on one of its interfaces. 1677 */ 1678 int 1679 in6_localip(struct in6_addr *in6) 1680 { 1681 struct rm_priotracker in6_ifa_tracker; 1682 struct in6_ifaddr *ia; 1683 1684 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1685 LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 1686 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) { 1687 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1688 return (1); 1689 } 1690 } 1691 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1692 return (0); 1693 } 1694 1695 /* 1696 * Return 1 if an internet address is configured on an interface. 1697 */ 1698 int 1699 in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr) 1700 { 1701 struct in6_addr in6; 1702 struct ifaddr *ifa; 1703 struct in6_ifaddr *ia6; 1704 1705 in6 = *addr; 1706 if (in6_clearscope(&in6)) 1707 return (0); 1708 in6_setscope(&in6, ifp, NULL); 1709 1710 IF_ADDR_RLOCK(ifp); 1711 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1712 if (ifa->ifa_addr->sa_family != AF_INET6) 1713 continue; 1714 ia6 = (struct in6_ifaddr *)ifa; 1715 if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) { 1716 IF_ADDR_RUNLOCK(ifp); 1717 return (1); 1718 } 1719 } 1720 IF_ADDR_RUNLOCK(ifp); 1721 1722 return (0); 1723 } 1724 1725 int 1726 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1727 { 1728 struct rm_priotracker in6_ifa_tracker; 1729 struct in6_ifaddr *ia; 1730 1731 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1732 LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) { 1733 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) { 1734 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 1735 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1736 return (1); /* true */ 1737 } 1738 break; 1739 } 1740 } 1741 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1742 1743 return (0); /* false */ 1744 } 1745 1746 /* 1747 * return length of part which dst and src are equal 1748 * hard coding... 1749 */ 1750 int 1751 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1752 { 1753 int match = 0; 1754 u_char *s = (u_char *)src, *d = (u_char *)dst; 1755 u_char *lim = s + 16, r; 1756 1757 while (s < lim) 1758 if ((r = (*d++ ^ *s++)) != 0) { 1759 while (r < 128) { 1760 match++; 1761 r <<= 1; 1762 } 1763 break; 1764 } else 1765 match += 8; 1766 return match; 1767 } 1768 1769 /* XXX: to be scope conscious */ 1770 int 1771 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1772 { 1773 int bytelen, bitlen; 1774 1775 /* sanity check */ 1776 if (0 > len || len > 128) { 1777 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1778 len); 1779 return (0); 1780 } 1781 1782 bytelen = len / 8; 1783 bitlen = len % 8; 1784 1785 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1786 return (0); 1787 if (bitlen != 0 && 1788 p1->s6_addr[bytelen] >> (8 - bitlen) != 1789 p2->s6_addr[bytelen] >> (8 - bitlen)) 1790 return (0); 1791 1792 return (1); 1793 } 1794 1795 void 1796 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1797 { 1798 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1799 int bytelen, bitlen, i; 1800 1801 /* sanity check */ 1802 if (0 > len || len > 128) { 1803 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1804 len); 1805 return; 1806 } 1807 1808 bzero(maskp, sizeof(*maskp)); 1809 bytelen = len / 8; 1810 bitlen = len % 8; 1811 for (i = 0; i < bytelen; i++) 1812 maskp->s6_addr[i] = 0xff; 1813 if (bitlen) 1814 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1815 } 1816 1817 /* 1818 * return the best address out of the same scope. if no address was 1819 * found, return the first valid address from designated IF. 1820 */ 1821 struct in6_ifaddr * 1822 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 1823 { 1824 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 1825 struct ifaddr *ifa; 1826 struct in6_ifaddr *besta = 0; 1827 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 1828 1829 dep[0] = dep[1] = NULL; 1830 1831 /* 1832 * We first look for addresses in the same scope. 1833 * If there is one, return it. 1834 * If two or more, return one which matches the dst longest. 1835 * If none, return one of global addresses assigned other ifs. 1836 */ 1837 IF_ADDR_RLOCK(ifp); 1838 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1839 if (ifa->ifa_addr->sa_family != AF_INET6) 1840 continue; 1841 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1842 continue; /* XXX: is there any case to allow anycast? */ 1843 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1844 continue; /* don't use this interface */ 1845 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1846 continue; 1847 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1848 if (V_ip6_use_deprecated) 1849 dep[0] = (struct in6_ifaddr *)ifa; 1850 continue; 1851 } 1852 1853 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 1854 /* 1855 * call in6_matchlen() as few as possible 1856 */ 1857 if (besta) { 1858 if (blen == -1) 1859 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 1860 tlen = in6_matchlen(IFA_IN6(ifa), dst); 1861 if (tlen > blen) { 1862 blen = tlen; 1863 besta = (struct in6_ifaddr *)ifa; 1864 } 1865 } else 1866 besta = (struct in6_ifaddr *)ifa; 1867 } 1868 } 1869 if (besta) { 1870 ifa_ref(&besta->ia_ifa); 1871 IF_ADDR_RUNLOCK(ifp); 1872 return (besta); 1873 } 1874 1875 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1876 if (ifa->ifa_addr->sa_family != AF_INET6) 1877 continue; 1878 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1879 continue; /* XXX: is there any case to allow anycast? */ 1880 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1881 continue; /* don't use this interface */ 1882 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1883 continue; 1884 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1885 if (V_ip6_use_deprecated) 1886 dep[1] = (struct in6_ifaddr *)ifa; 1887 continue; 1888 } 1889 1890 if (ifa != NULL) 1891 ifa_ref(ifa); 1892 IF_ADDR_RUNLOCK(ifp); 1893 return (struct in6_ifaddr *)ifa; 1894 } 1895 1896 /* use the last-resort values, that are, deprecated addresses */ 1897 if (dep[0]) { 1898 ifa_ref((struct ifaddr *)dep[0]); 1899 IF_ADDR_RUNLOCK(ifp); 1900 return dep[0]; 1901 } 1902 if (dep[1]) { 1903 ifa_ref((struct ifaddr *)dep[1]); 1904 IF_ADDR_RUNLOCK(ifp); 1905 return dep[1]; 1906 } 1907 1908 IF_ADDR_RUNLOCK(ifp); 1909 return NULL; 1910 } 1911 1912 /* 1913 * perform DAD when interface becomes IFF_UP. 1914 */ 1915 void 1916 in6_if_up(struct ifnet *ifp) 1917 { 1918 struct ifaddr *ifa; 1919 struct in6_ifaddr *ia; 1920 1921 IF_ADDR_RLOCK(ifp); 1922 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1923 if (ifa->ifa_addr->sa_family != AF_INET6) 1924 continue; 1925 ia = (struct in6_ifaddr *)ifa; 1926 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 1927 /* 1928 * The TENTATIVE flag was likely set by hand 1929 * beforehand, implicitly indicating the need for DAD. 1930 * We may be able to skip the random delay in this 1931 * case, but we impose delays just in case. 1932 */ 1933 nd6_dad_start(ifa, 1934 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 1935 } 1936 } 1937 IF_ADDR_RUNLOCK(ifp); 1938 1939 /* 1940 * special cases, like 6to4, are handled in in6_ifattach 1941 */ 1942 in6_ifattach(ifp, NULL); 1943 } 1944 1945 int 1946 in6if_do_dad(struct ifnet *ifp) 1947 { 1948 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 1949 return (0); 1950 1951 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) || 1952 (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD)) 1953 return (0); 1954 1955 /* 1956 * Our DAD routine requires the interface up and running. 1957 * However, some interfaces can be up before the RUNNING 1958 * status. Additionaly, users may try to assign addresses 1959 * before the interface becomes up (or running). 1960 * We simply skip DAD in such a case as a work around. 1961 * XXX: we should rather mark "tentative" on such addresses, 1962 * and do DAD after the interface becomes ready. 1963 */ 1964 if (!((ifp->if_flags & IFF_UP) && 1965 (ifp->if_drv_flags & IFF_DRV_RUNNING))) 1966 return (0); 1967 1968 return (1); 1969 } 1970 1971 /* 1972 * Calculate max IPv6 MTU through all the interfaces and store it 1973 * to in6_maxmtu. 1974 */ 1975 void 1976 in6_setmaxmtu(void) 1977 { 1978 unsigned long maxmtu = 0; 1979 struct ifnet *ifp; 1980 1981 IFNET_RLOCK_NOSLEEP(); 1982 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1983 /* this function can be called during ifnet initialization */ 1984 if (!ifp->if_afdata[AF_INET6]) 1985 continue; 1986 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 1987 IN6_LINKMTU(ifp) > maxmtu) 1988 maxmtu = IN6_LINKMTU(ifp); 1989 } 1990 IFNET_RUNLOCK_NOSLEEP(); 1991 if (maxmtu) /* update only when maxmtu is positive */ 1992 V_in6_maxmtu = maxmtu; 1993 } 1994 1995 /* 1996 * Provide the length of interface identifiers to be used for the link attached 1997 * to the given interface. The length should be defined in "IPv6 over 1998 * xxx-link" document. Note that address architecture might also define 1999 * the length for a particular set of address prefixes, regardless of the 2000 * link type. As clarified in rfc2462bis, those two definitions should be 2001 * consistent, and those really are as of August 2004. 2002 */ 2003 int 2004 in6_if2idlen(struct ifnet *ifp) 2005 { 2006 switch (ifp->if_type) { 2007 case IFT_ETHER: /* RFC2464 */ 2008 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2009 case IFT_L2VLAN: /* ditto */ 2010 case IFT_IEEE80211: /* ditto */ 2011 case IFT_INFINIBAND: 2012 return (64); 2013 case IFT_FDDI: /* RFC2467 */ 2014 return (64); 2015 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 2016 return (64); 2017 case IFT_PPP: /* RFC2472 */ 2018 return (64); 2019 case IFT_ARCNET: /* RFC2497 */ 2020 return (64); 2021 case IFT_FRELAY: /* RFC2590 */ 2022 return (64); 2023 case IFT_IEEE1394: /* RFC3146 */ 2024 return (64); 2025 case IFT_GIF: 2026 return (64); /* draft-ietf-v6ops-mech-v2-07 */ 2027 case IFT_LOOP: 2028 return (64); /* XXX: is this really correct? */ 2029 default: 2030 /* 2031 * Unknown link type: 2032 * It might be controversial to use the today's common constant 2033 * of 64 for these cases unconditionally. For full compliance, 2034 * we should return an error in this case. On the other hand, 2035 * if we simply miss the standard for the link type or a new 2036 * standard is defined for a new link type, the IFID length 2037 * is very likely to be the common constant. As a compromise, 2038 * we always use the constant, but make an explicit notice 2039 * indicating the "unknown" case. 2040 */ 2041 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2042 return (64); 2043 } 2044 } 2045 2046 #include <sys/sysctl.h> 2047 2048 struct in6_llentry { 2049 struct llentry base; 2050 struct sockaddr_in6 l3_addr6; 2051 }; 2052 2053 /* 2054 * Deletes an address from the address table. 2055 * This function is called by the timer functions 2056 * such as arptimer() and nd6_llinfo_timer(), and 2057 * the caller does the locking. 2058 */ 2059 static void 2060 in6_lltable_free(struct lltable *llt, struct llentry *lle) 2061 { 2062 LLE_WUNLOCK(lle); 2063 LLE_LOCK_DESTROY(lle); 2064 free(lle, M_LLTABLE); 2065 } 2066 2067 static struct llentry * 2068 in6_lltable_new(const struct sockaddr *l3addr, u_int flags) 2069 { 2070 struct in6_llentry *lle; 2071 2072 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 2073 if (lle == NULL) /* NB: caller generates msg */ 2074 return NULL; 2075 2076 lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr; 2077 lle->base.lle_refcnt = 1; 2078 lle->base.lle_free = in6_lltable_free; 2079 LLE_LOCK_INIT(&lle->base); 2080 callout_init(&lle->base.ln_timer_ch, 1); 2081 2082 return (&lle->base); 2083 } 2084 2085 static void 2086 in6_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix, 2087 const struct sockaddr *mask, u_int flags) 2088 { 2089 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix; 2090 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask; 2091 struct llentry *lle, *next; 2092 int i; 2093 2094 /* 2095 * (flags & LLE_STATIC) means deleting all entries 2096 * including static ND6 entries. 2097 */ 2098 IF_AFDATA_WLOCK(llt->llt_ifp); 2099 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 2100 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 2101 if (IN6_ARE_MASKED_ADDR_EQUAL( 2102 &satosin6(L3_ADDR(lle))->sin6_addr, 2103 &pfx->sin6_addr, &msk->sin6_addr) && 2104 ((flags & LLE_STATIC) || 2105 !(lle->la_flags & LLE_STATIC))) { 2106 LLE_WLOCK(lle); 2107 if (callout_stop(&lle->la_timer)) 2108 LLE_REMREF(lle); 2109 llentry_free(lle); 2110 } 2111 } 2112 } 2113 IF_AFDATA_WUNLOCK(llt->llt_ifp); 2114 } 2115 2116 static int 2117 in6_lltable_rtcheck(struct ifnet *ifp, 2118 u_int flags, 2119 const struct sockaddr *l3addr) 2120 { 2121 struct rtentry *rt; 2122 char ip6buf[INET6_ADDRSTRLEN]; 2123 2124 KASSERT(l3addr->sa_family == AF_INET6, 2125 ("sin_family %d", l3addr->sa_family)); 2126 2127 /* Our local addresses are always only installed on the default FIB. */ 2128 /* XXX rtalloc1 should take a const param */ 2129 rt = in6_rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0, 2130 RT_DEFAULT_FIB); 2131 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 2132 struct ifaddr *ifa; 2133 /* 2134 * Create an ND6 cache for an IPv6 neighbor 2135 * that is not covered by our own prefix. 2136 */ 2137 /* XXX ifaof_ifpforaddr should take a const param */ 2138 ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp); 2139 if (ifa != NULL) { 2140 ifa_free(ifa); 2141 if (rt != NULL) 2142 RTFREE_LOCKED(rt); 2143 return 0; 2144 } 2145 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2146 ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr)); 2147 if (rt != NULL) 2148 RTFREE_LOCKED(rt); 2149 return EINVAL; 2150 } 2151 RTFREE_LOCKED(rt); 2152 return 0; 2153 } 2154 2155 static struct llentry * 2156 in6_lltable_lookup(struct lltable *llt, u_int flags, 2157 const struct sockaddr *l3addr) 2158 { 2159 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2160 struct ifnet *ifp = llt->llt_ifp; 2161 struct llentry *lle; 2162 struct llentries *lleh; 2163 u_int hashkey; 2164 2165 IF_AFDATA_LOCK_ASSERT(ifp); 2166 KASSERT(l3addr->sa_family == AF_INET6, 2167 ("sin_family %d", l3addr->sa_family)); 2168 2169 hashkey = sin6->sin6_addr.s6_addr32[3]; 2170 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 2171 LIST_FOREACH(lle, lleh, lle_next) { 2172 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle); 2173 if (lle->la_flags & LLE_DELETED) 2174 continue; 2175 if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr, 2176 sizeof(struct in6_addr)) == 0) 2177 break; 2178 } 2179 2180 if (lle == NULL) { 2181 if (!(flags & LLE_CREATE)) 2182 return (NULL); 2183 IF_AFDATA_WLOCK_ASSERT(ifp); 2184 /* 2185 * A route that covers the given address must have 2186 * been installed 1st because we are doing a resolution, 2187 * verify this. 2188 */ 2189 if (!(flags & LLE_IFADDR) && 2190 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2191 return NULL; 2192 2193 lle = in6_lltable_new(l3addr, flags); 2194 if (lle == NULL) { 2195 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2196 return NULL; 2197 } 2198 lle->la_flags = flags & ~LLE_CREATE; 2199 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 2200 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 2201 lle->la_flags |= (LLE_VALID | LLE_STATIC); 2202 } 2203 2204 lle->lle_tbl = llt; 2205 lle->lle_head = lleh; 2206 lle->la_flags |= LLE_LINKED; 2207 LIST_INSERT_HEAD(lleh, lle, lle_next); 2208 } else if (flags & LLE_DELETE) { 2209 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 2210 LLE_WLOCK(lle); 2211 lle->la_flags |= LLE_DELETED; 2212 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 2213 #ifdef DIAGNOSTIC 2214 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2215 #endif 2216 if ((lle->la_flags & 2217 (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC) 2218 llentry_free(lle); 2219 else 2220 LLE_WUNLOCK(lle); 2221 } 2222 lle = (void *)-1; 2223 } 2224 if (LLE_IS_VALID(lle)) { 2225 if (flags & LLE_EXCLUSIVE) 2226 LLE_WLOCK(lle); 2227 else 2228 LLE_RLOCK(lle); 2229 } 2230 return (lle); 2231 } 2232 2233 static int 2234 in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 2235 { 2236 struct ifnet *ifp = llt->llt_ifp; 2237 struct llentry *lle; 2238 /* XXX stack use */ 2239 struct { 2240 struct rt_msghdr rtm; 2241 struct sockaddr_in6 sin6; 2242 /* 2243 * ndp.c assumes that sdl is word aligned 2244 */ 2245 #ifdef __LP64__ 2246 uint32_t pad; 2247 #endif 2248 struct sockaddr_dl sdl; 2249 } ndpc; 2250 int i, error; 2251 2252 if (ifp->if_flags & IFF_LOOPBACK) 2253 return 0; 2254 2255 LLTABLE_LOCK_ASSERT(); 2256 2257 error = 0; 2258 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 2259 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 2260 struct sockaddr_dl *sdl; 2261 2262 /* skip deleted or invalid entries */ 2263 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID) 2264 continue; 2265 /* Skip if jailed and not a valid IP of the prison. */ 2266 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 2267 continue; 2268 /* 2269 * produce a msg made of: 2270 * struct rt_msghdr; 2271 * struct sockaddr_in6 (IPv6) 2272 * struct sockaddr_dl; 2273 */ 2274 bzero(&ndpc, sizeof(ndpc)); 2275 ndpc.rtm.rtm_msglen = sizeof(ndpc); 2276 ndpc.rtm.rtm_version = RTM_VERSION; 2277 ndpc.rtm.rtm_type = RTM_GET; 2278 ndpc.rtm.rtm_flags = RTF_UP; 2279 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 2280 ndpc.sin6.sin6_family = AF_INET6; 2281 ndpc.sin6.sin6_len = sizeof(ndpc.sin6); 2282 bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle)); 2283 if (V_deembed_scopeid) 2284 sa6_recoverscope(&ndpc.sin6); 2285 2286 /* publish */ 2287 if (lle->la_flags & LLE_PUB) 2288 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE; 2289 2290 sdl = &ndpc.sdl; 2291 sdl->sdl_family = AF_LINK; 2292 sdl->sdl_len = sizeof(*sdl); 2293 sdl->sdl_alen = ifp->if_addrlen; 2294 sdl->sdl_index = ifp->if_index; 2295 sdl->sdl_type = ifp->if_type; 2296 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 2297 ndpc.rtm.rtm_rmx.rmx_expire = 2298 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 2299 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 2300 if (lle->la_flags & LLE_STATIC) 2301 ndpc.rtm.rtm_flags |= RTF_STATIC; 2302 ndpc.rtm.rtm_index = ifp->if_index; 2303 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc)); 2304 if (error) 2305 break; 2306 } 2307 } 2308 return error; 2309 } 2310 2311 void * 2312 in6_domifattach(struct ifnet *ifp) 2313 { 2314 struct in6_ifextra *ext; 2315 2316 /* There are not IPv6-capable interfaces. */ 2317 switch (ifp->if_type) { 2318 case IFT_PFLOG: 2319 case IFT_PFSYNC: 2320 case IFT_USB: 2321 return (NULL); 2322 } 2323 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2324 bzero(ext, sizeof(*ext)); 2325 2326 ext->in6_ifstat = malloc(sizeof(counter_u64_t) * 2327 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK); 2328 COUNTER_ARRAY_ALLOC(ext->in6_ifstat, 2329 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK); 2330 2331 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) * 2332 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR, 2333 M_WAITOK); 2334 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat, 2335 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK); 2336 2337 ext->nd_ifinfo = nd6_ifattach(ifp); 2338 ext->scope6_id = scope6_ifattach(ifp); 2339 ext->lltable = lltable_init(ifp, AF_INET6); 2340 if (ext->lltable != NULL) { 2341 ext->lltable->llt_prefix_free = in6_lltable_prefix_free; 2342 ext->lltable->llt_lookup = in6_lltable_lookup; 2343 ext->lltable->llt_dump = in6_lltable_dump; 2344 } 2345 2346 ext->mld_ifinfo = mld_domifattach(ifp); 2347 2348 return ext; 2349 } 2350 2351 int 2352 in6_domifmtu(struct ifnet *ifp) 2353 { 2354 2355 return (IN6_LINKMTU(ifp)); 2356 } 2357 2358 void 2359 in6_domifdetach(struct ifnet *ifp, void *aux) 2360 { 2361 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2362 2363 mld_domifdetach(ifp); 2364 scope6_ifdetach(ext->scope6_id); 2365 nd6_ifdetach(ext->nd_ifinfo); 2366 lltable_free(ext->lltable); 2367 COUNTER_ARRAY_FREE(ext->in6_ifstat, 2368 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 2369 free(ext->in6_ifstat, M_IFADDR); 2370 COUNTER_ARRAY_FREE(ext->icmp6_ifstat, 2371 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 2372 free(ext->icmp6_ifstat, M_IFADDR); 2373 free(ext, M_IFADDR); 2374 } 2375 2376 /* 2377 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2378 * v4 mapped addr or v4 compat addr 2379 */ 2380 void 2381 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2382 { 2383 2384 bzero(sin, sizeof(*sin)); 2385 sin->sin_len = sizeof(struct sockaddr_in); 2386 sin->sin_family = AF_INET; 2387 sin->sin_port = sin6->sin6_port; 2388 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2389 } 2390 2391 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2392 void 2393 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2394 { 2395 bzero(sin6, sizeof(*sin6)); 2396 sin6->sin6_len = sizeof(struct sockaddr_in6); 2397 sin6->sin6_family = AF_INET6; 2398 sin6->sin6_port = sin->sin_port; 2399 sin6->sin6_addr.s6_addr32[0] = 0; 2400 sin6->sin6_addr.s6_addr32[1] = 0; 2401 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2402 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2403 } 2404 2405 /* Convert sockaddr_in6 into sockaddr_in. */ 2406 void 2407 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2408 { 2409 struct sockaddr_in *sin_p; 2410 struct sockaddr_in6 sin6; 2411 2412 /* 2413 * Save original sockaddr_in6 addr and convert it 2414 * to sockaddr_in. 2415 */ 2416 sin6 = *(struct sockaddr_in6 *)nam; 2417 sin_p = (struct sockaddr_in *)nam; 2418 in6_sin6_2_sin(sin_p, &sin6); 2419 } 2420 2421 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2422 void 2423 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2424 { 2425 struct sockaddr_in *sin_p; 2426 struct sockaddr_in6 *sin6_p; 2427 2428 sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK); 2429 sin_p = (struct sockaddr_in *)*nam; 2430 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2431 free(*nam, M_SONAME); 2432 *nam = (struct sockaddr *)sin6_p; 2433 } 2434