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/syslog.h> 84 85 #include <net/if.h> 86 #include <net/if_var.h> 87 #include <net/if_types.h> 88 #include <net/route.h> 89 #include <net/if_dl.h> 90 #include <net/vnet.h> 91 92 #include <netinet/in.h> 93 #include <netinet/in_var.h> 94 #include <net/if_llatbl.h> 95 #include <netinet/if_ether.h> 96 #include <netinet/in_systm.h> 97 #include <netinet/ip.h> 98 #include <netinet/in_pcb.h> 99 #include <netinet/ip_carp.h> 100 101 #include <netinet/ip6.h> 102 #include <netinet6/ip6_var.h> 103 #include <netinet6/nd6.h> 104 #include <netinet6/mld6_var.h> 105 #include <netinet6/ip6_mroute.h> 106 #include <netinet6/in6_ifattach.h> 107 #include <netinet6/scope6_var.h> 108 #include <netinet6/in6_pcb.h> 109 110 VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix); 111 #define V_icmp6_nodeinfo_oldmcprefix VNET(icmp6_nodeinfo_oldmcprefix) 112 113 /* 114 * Definitions of some costant IP6 addresses. 115 */ 116 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 117 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 118 const struct in6_addr in6addr_nodelocal_allnodes = 119 IN6ADDR_NODELOCAL_ALLNODES_INIT; 120 const struct in6_addr in6addr_linklocal_allnodes = 121 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 122 const struct in6_addr in6addr_linklocal_allrouters = 123 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 124 const struct in6_addr in6addr_linklocal_allv2routers = 125 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT; 126 127 const struct in6_addr in6mask0 = IN6MASK0; 128 const struct in6_addr in6mask32 = IN6MASK32; 129 const struct in6_addr in6mask64 = IN6MASK64; 130 const struct in6_addr in6mask96 = IN6MASK96; 131 const struct in6_addr in6mask128 = IN6MASK128; 132 133 const struct sockaddr_in6 sa6_any = 134 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 }; 135 136 static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *, 137 struct in6_aliasreq *, int); 138 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 139 140 int (*faithprefix_p)(struct in6_addr *); 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 break; /* we don't need to install a host route. */ 642 } 643 pr0.ndpr_prefix = ifra->ifra_addr; 644 /* apply the mask for safety. */ 645 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, 646 &ifra->ifra_prefixmask.sin6_addr); 647 648 /* 649 * XXX: since we don't have an API to set prefix (not address) 650 * lifetimes, we just use the same lifetimes as addresses. 651 * The (temporarily) installed lifetimes can be overridden by 652 * later advertised RAs (when accept_rtadv is non 0), which is 653 * an intended behavior. 654 */ 655 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 656 pr0.ndpr_raf_auto = 657 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 658 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 659 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 660 661 /* add the prefix if not yet. */ 662 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 663 /* 664 * nd6_prelist_add will install the corresponding 665 * interface route. 666 */ 667 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) { 668 if (carp_attached) 669 (*carp_detach_p)(&ia->ia_ifa); 670 goto out; 671 } 672 if (pr == NULL) { 673 if (carp_attached) 674 (*carp_detach_p)(&ia->ia_ifa); 675 log(LOG_ERR, "nd6_prelist_add succeeded but " 676 "no prefix\n"); 677 error = EINVAL; 678 goto out; 679 } 680 } 681 682 /* relate the address to the prefix */ 683 if (ia->ia6_ndpr == NULL) { 684 ia->ia6_ndpr = pr; 685 pr->ndpr_refcnt++; 686 687 /* 688 * If this is the first autoconf address from the 689 * prefix, create a temporary address as well 690 * (when required). 691 */ 692 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 693 V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) { 694 int e; 695 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 696 log(LOG_NOTICE, "in6_control: failed " 697 "to create a temporary address, " 698 "errno=%d\n", e); 699 } 700 } 701 } 702 703 /* 704 * this might affect the status of autoconfigured addresses, 705 * that is, this address might make other addresses detached. 706 */ 707 pfxlist_onlink_check(); 708 if (error == 0 && ia) { 709 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) { 710 /* 711 * Try to clear the flag when a new 712 * IPv6 address is added onto an 713 * IFDISABLED interface and it 714 * succeeds. 715 */ 716 struct in6_ndireq nd; 717 718 memset(&nd, 0, sizeof(nd)); 719 nd.ndi.flags = ND_IFINFO(ifp)->flags; 720 nd.ndi.flags &= ~ND6_IFF_IFDISABLED; 721 if (nd6_ioctl(SIOCSIFINFO_FLAGS, 722 (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 728 * intentionally. The failure means 729 * address duplication was detected. 730 */ 731 } 732 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 733 } 734 break; 735 } 736 737 case SIOCDIFADDR_IN6: 738 { 739 struct nd_prefix *pr; 740 741 /* 742 * If the address being deleted is the only one that owns 743 * the corresponding prefix, expire the prefix as well. 744 * XXX: theoretically, we don't have to worry about such 745 * relationship, since we separate the address management 746 * and the prefix management. We do this, however, to provide 747 * as much backward compatibility as possible in terms of 748 * the ioctl operation. 749 * Note that in6_purgeaddr() will decrement ndpr_refcnt. 750 */ 751 pr = ia->ia6_ndpr; 752 in6_purgeaddr(&ia->ia_ifa); 753 if (pr && pr->ndpr_refcnt == 0) 754 prelist_remove(pr); 755 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 756 break; 757 } 758 759 default: 760 if (ifp->if_ioctl == NULL) { 761 error = EOPNOTSUPP; 762 goto out; 763 } 764 error = (*ifp->if_ioctl)(ifp, cmd, data); 765 goto out; 766 } 767 768 error = 0; 769 out: 770 if (ia != NULL) 771 ifa_free(&ia->ia_ifa); 772 return (error); 773 } 774 775 776 /* 777 * Join necessary multicast groups. Factored out from in6_update_ifa(). 778 * This entire work should only be done once, for the default FIB. 779 */ 780 static int 781 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra, 782 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol) 783 { 784 char ip6buf[INET6_ADDRSTRLEN]; 785 struct in6_addr mltaddr; 786 struct in6_multi_mship *imm; 787 int delay, error; 788 789 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__)); 790 791 /* Join solicited multicast addr for new host id. */ 792 bzero(&mltaddr, sizeof(struct in6_addr)); 793 mltaddr.s6_addr32[0] = IPV6_ADDR_INT32_MLL; 794 mltaddr.s6_addr32[2] = htonl(1); 795 mltaddr.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 796 mltaddr.s6_addr8[12] = 0xff; 797 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) { 798 /* XXX: should not happen */ 799 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 800 goto cleanup; 801 } 802 delay = error = 0; 803 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 804 /* 805 * We need a random delay for DAD on the address being 806 * configured. It also means delaying transmission of the 807 * corresponding MLD report to avoid report collision. 808 * [RFC 4861, Section 6.3.7] 809 */ 810 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 811 } 812 imm = in6_joingroup(ifp, &mltaddr, &error, delay); 813 if (imm == NULL) { 814 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 815 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 816 if_name(ifp), error)); 817 goto cleanup; 818 } 819 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 820 *in6m_sol = imm->i6mm_maddr; 821 822 /* 823 * Join link-local all-nodes address. 824 */ 825 mltaddr = in6addr_linklocal_allnodes; 826 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 827 goto cleanup; /* XXX: should not fail */ 828 829 imm = in6_joingroup(ifp, &mltaddr, &error, 0); 830 if (imm == NULL) { 831 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 832 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 833 if_name(ifp), error)); 834 goto cleanup; 835 } 836 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 837 838 /* 839 * Join node information group address. 840 */ 841 delay = 0; 842 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 843 /* 844 * The spec does not say anything about delay for this group, 845 * but the same logic should apply. 846 */ 847 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 848 } 849 if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) { 850 /* XXX jinmei */ 851 imm = in6_joingroup(ifp, &mltaddr, &error, delay); 852 if (imm == NULL) 853 nd6log((LOG_WARNING, 854 "%s: in6_joingroup failed for %s on %s " 855 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 856 &mltaddr), if_name(ifp), error)); 857 /* XXX not very fatal, go on... */ 858 else 859 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 860 } 861 if (V_icmp6_nodeinfo_oldmcprefix && 862 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) { 863 imm = in6_joingroup(ifp, &mltaddr, &error, delay); 864 if (imm == NULL) 865 nd6log((LOG_WARNING, 866 "%s: in6_joingroup failed for %s on %s " 867 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 868 &mltaddr), if_name(ifp), error)); 869 /* XXX not very fatal, go on... */ 870 else 871 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 872 } 873 874 /* 875 * Join interface-local all-nodes address. 876 * (ff01::1%ifN, and ff01::%ifN/32) 877 */ 878 mltaddr = in6addr_nodelocal_allnodes; 879 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 880 goto cleanup; /* XXX: should not fail */ 881 882 imm = in6_joingroup(ifp, &mltaddr, &error, 0); 883 if (imm == NULL) { 884 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 885 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 886 &mltaddr), if_name(ifp), error)); 887 goto cleanup; 888 } 889 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 890 891 cleanup: 892 return (error); 893 } 894 895 /* 896 * Update parameters of an IPv6 interface address. 897 * If necessary, a new entry is created and linked into address chains. 898 * This function is separated from in6_control(). 899 */ 900 int 901 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 902 struct in6_ifaddr *ia, int flags) 903 { 904 int error, hostIsNew = 0; 905 906 if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0) 907 return (error); 908 909 if (ia == NULL) { 910 hostIsNew = 1; 911 if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL) 912 return (ENOBUFS); 913 } 914 915 error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags); 916 if (error != 0) { 917 if (hostIsNew != 0) { 918 in6_unlink_ifa(ia, ifp); 919 ifa_free(&ia->ia_ifa); 920 } 921 return (error); 922 } 923 924 if (hostIsNew) 925 error = in6_broadcast_ifa(ifp, ifra, ia, flags); 926 927 return (error); 928 } 929 930 /* 931 * Fill in basic IPv6 address request info. 932 */ 933 void 934 in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr, 935 const struct in6_addr *mask) 936 { 937 938 memset(ifra, 0, sizeof(struct in6_aliasreq)); 939 940 ifra->ifra_addr.sin6_family = AF_INET6; 941 ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 942 if (addr != NULL) 943 ifra->ifra_addr.sin6_addr = *addr; 944 945 ifra->ifra_prefixmask.sin6_family = AF_INET6; 946 ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 947 if (mask != NULL) 948 ifra->ifra_prefixmask.sin6_addr = *mask; 949 } 950 951 static int 952 in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra, 953 struct in6_ifaddr *ia, int flags) 954 { 955 int plen = -1; 956 struct sockaddr_in6 dst6; 957 struct in6_addrlifetime *lt; 958 char ip6buf[INET6_ADDRSTRLEN]; 959 960 /* Validate parameters */ 961 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 962 return (EINVAL); 963 964 /* 965 * The destination address for a p2p link must have a family 966 * of AF_UNSPEC or AF_INET6. 967 */ 968 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 969 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 970 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 971 return (EAFNOSUPPORT); 972 973 /* 974 * Validate address 975 */ 976 if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) || 977 ifra->ifra_addr.sin6_family != AF_INET6) 978 return (EINVAL); 979 980 /* 981 * validate ifra_prefixmask. don't check sin6_family, netmask 982 * does not carry fields other than sin6_len. 983 */ 984 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 985 return (EINVAL); 986 /* 987 * Because the IPv6 address architecture is classless, we require 988 * users to specify a (non 0) prefix length (mask) for a new address. 989 * We also require the prefix (when specified) mask is valid, and thus 990 * reject a non-consecutive mask. 991 */ 992 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 993 return (EINVAL); 994 if (ifra->ifra_prefixmask.sin6_len != 0) { 995 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 996 (u_char *)&ifra->ifra_prefixmask + 997 ifra->ifra_prefixmask.sin6_len); 998 if (plen <= 0) 999 return (EINVAL); 1000 } else { 1001 /* 1002 * In this case, ia must not be NULL. We just use its prefix 1003 * length. 1004 */ 1005 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1006 } 1007 /* 1008 * If the destination address on a p2p interface is specified, 1009 * and the address is a scoped one, validate/set the scope 1010 * zone identifier. 1011 */ 1012 dst6 = ifra->ifra_dstaddr; 1013 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 1014 (dst6.sin6_family == AF_INET6)) { 1015 struct in6_addr in6_tmp; 1016 u_int32_t zoneid; 1017 1018 in6_tmp = dst6.sin6_addr; 1019 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 1020 return (EINVAL); /* XXX: should be impossible */ 1021 1022 if (dst6.sin6_scope_id != 0) { 1023 if (dst6.sin6_scope_id != zoneid) 1024 return (EINVAL); 1025 } else /* user omit to specify the ID. */ 1026 dst6.sin6_scope_id = zoneid; 1027 1028 /* convert into the internal form */ 1029 if (sa6_embedscope(&dst6, 0)) 1030 return (EINVAL); /* XXX: should be impossible */ 1031 } 1032 /* Modify original ifra_dstaddr to reflect changes */ 1033 ifra->ifra_dstaddr = dst6; 1034 1035 /* 1036 * The destination address can be specified only for a p2p or a 1037 * loopback interface. If specified, the corresponding prefix length 1038 * must be 128. 1039 */ 1040 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 1041 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 1042 /* XXX: noisy message */ 1043 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 1044 "be specified for a p2p or a loopback IF only\n")); 1045 return (EINVAL); 1046 } 1047 if (plen != 128) { 1048 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 1049 "be 128 when dstaddr is specified\n")); 1050 return (EINVAL); 1051 } 1052 } 1053 /* lifetime consistency check */ 1054 lt = &ifra->ifra_lifetime; 1055 if (lt->ia6t_pltime > lt->ia6t_vltime) 1056 return (EINVAL); 1057 if (lt->ia6t_vltime == 0) { 1058 /* 1059 * the following log might be noisy, but this is a typical 1060 * configuration mistake or a tool's bug. 1061 */ 1062 nd6log((LOG_INFO, 1063 "in6_update_ifa: valid lifetime is 0 for %s\n", 1064 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr))); 1065 1066 if (ia == NULL) 1067 return (0); /* there's nothing to do */ 1068 } 1069 1070 /* Check prefix mask */ 1071 if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) { 1072 /* 1073 * We prohibit changing the prefix length of an existing 1074 * address, because 1075 * + such an operation should be rare in IPv6, and 1076 * + the operation would confuse prefix management. 1077 */ 1078 if (ia->ia_prefixmask.sin6_len != 0 && 1079 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 1080 nd6log((LOG_INFO, "in6_validate_ifa: the prefix length " 1081 "of an existing %s address should not be changed\n", 1082 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1083 1084 return (EINVAL); 1085 } 1086 } 1087 1088 return (0); 1089 } 1090 1091 1092 /* 1093 * Allocate a new ifaddr and link it into chains. 1094 */ 1095 static struct in6_ifaddr * 1096 in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags) 1097 { 1098 struct in6_ifaddr *ia; 1099 1100 /* 1101 * When in6_alloc_ifa() is called in a process of a received 1102 * RA, it is called under an interrupt context. So, we should 1103 * call malloc with M_NOWAIT. 1104 */ 1105 ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT); 1106 if (ia == NULL) 1107 return (NULL); 1108 LIST_INIT(&ia->ia6_memberships); 1109 /* Initialize the address and masks, and put time stamp */ 1110 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1111 ia->ia_addr.sin6_family = AF_INET6; 1112 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 1113 /* XXX: Can we assign ,sin6_addr and skip the rest? */ 1114 ia->ia_addr = ifra->ifra_addr; 1115 ia->ia6_createtime = time_uptime; 1116 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1117 /* 1118 * Some functions expect that ifa_dstaddr is not 1119 * NULL for p2p interfaces. 1120 */ 1121 ia->ia_ifa.ifa_dstaddr = 1122 (struct sockaddr *)&ia->ia_dstaddr; 1123 } else { 1124 ia->ia_ifa.ifa_dstaddr = NULL; 1125 } 1126 1127 /* set prefix mask if any */ 1128 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 1129 if (ifra->ifra_prefixmask.sin6_len != 0) { 1130 ia->ia_prefixmask.sin6_family = AF_INET6; 1131 ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len; 1132 ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr; 1133 } 1134 1135 ia->ia_ifp = ifp; 1136 ifa_ref(&ia->ia_ifa); /* if_addrhead */ 1137 IF_ADDR_WLOCK(ifp); 1138 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1139 IF_ADDR_WUNLOCK(ifp); 1140 1141 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */ 1142 IN6_IFADDR_WLOCK(); 1143 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link); 1144 LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash); 1145 IN6_IFADDR_WUNLOCK(); 1146 1147 return (ia); 1148 } 1149 1150 /* 1151 * Update/configure interface address parameters: 1152 * 1153 * 1) Update lifetime 1154 * 2) Update interface metric ad flags 1155 * 3) Notify other subsystems 1156 */ 1157 static int 1158 in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra, 1159 struct in6_ifaddr *ia, int hostIsNew, int flags) 1160 { 1161 int error; 1162 1163 /* update timestamp */ 1164 ia->ia6_updatetime = time_uptime; 1165 1166 /* 1167 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1168 * to see if the address is deprecated or invalidated, but initialize 1169 * these members for applications. 1170 */ 1171 ia->ia6_lifetime = ifra->ifra_lifetime; 1172 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1173 ia->ia6_lifetime.ia6t_expire = 1174 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1175 } else 1176 ia->ia6_lifetime.ia6t_expire = 0; 1177 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1178 ia->ia6_lifetime.ia6t_preferred = 1179 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1180 } else 1181 ia->ia6_lifetime.ia6t_preferred = 0; 1182 1183 /* 1184 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1185 * userland, make it deprecated. 1186 */ 1187 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1188 ia->ia6_lifetime.ia6t_pltime = 0; 1189 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1190 } 1191 1192 /* 1193 * configure address flags. 1194 */ 1195 ia->ia6_flags = ifra->ifra_flags; 1196 1197 /* 1198 * Make the address tentative before joining multicast addresses, 1199 * so that corresponding MLD responses would not have a tentative 1200 * source address. 1201 */ 1202 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1203 if (hostIsNew && in6if_do_dad(ifp)) 1204 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1205 1206 /* DAD should be performed after ND6_IFF_IFDISABLED is cleared. */ 1207 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1208 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1209 1210 /* notify other subsystems */ 1211 error = in6_notify_ifa(ifp, ia, ifra, hostIsNew); 1212 1213 return (error); 1214 } 1215 1216 /* 1217 * Do link-level ifa job: 1218 * 1) Add lle entry for added address 1219 * 2) Notifies routing socket users about new address 1220 * 3) join appropriate multicast group 1221 * 4) start DAD if enabled 1222 */ 1223 static int 1224 in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1225 struct in6_ifaddr *ia, int flags) 1226 { 1227 struct in6_multi *in6m_sol; 1228 int error = 0; 1229 1230 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1231 if ((error = nd6_add_ifa_lle(ia)) != 0) { 1232 in6_purgeaddr(&ia->ia_ifa); 1233 ifa_free(&ia->ia_ifa); 1234 return (error); 1235 } 1236 1237 /* Join necessary multicast groups. */ 1238 in6m_sol = NULL; 1239 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1240 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol); 1241 if (error != 0) { 1242 in6_purgeaddr(&ia->ia_ifa); 1243 ifa_free(&ia->ia_ifa); 1244 return (error); 1245 } 1246 } 1247 1248 /* 1249 * Perform DAD, if needed. 1250 * XXX It may be of use, if we can administratively disable DAD. 1251 */ 1252 if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && 1253 (ia->ia6_flags & IN6_IFF_TENTATIVE)) 1254 { 1255 int delay, mindelay, maxdelay; 1256 1257 delay = 0; 1258 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1259 /* 1260 * We need to impose a delay before sending an NS 1261 * for DAD. Check if we also needed a delay for the 1262 * corresponding MLD message. If we did, the delay 1263 * should be larger than the MLD delay (this could be 1264 * relaxed a bit, but this simple logic is at least 1265 * safe). 1266 * XXX: Break data hiding guidelines and look at 1267 * state for the solicited multicast group. 1268 */ 1269 mindelay = 0; 1270 if (in6m_sol != NULL && 1271 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) { 1272 mindelay = in6m_sol->in6m_timer; 1273 } 1274 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1275 if (maxdelay - mindelay == 0) 1276 delay = 0; 1277 else { 1278 delay = 1279 (arc4random() % (maxdelay - mindelay)) + 1280 mindelay; 1281 } 1282 } 1283 nd6_dad_start((struct ifaddr *)ia, delay); 1284 } 1285 1286 ifa_free(&ia->ia_ifa); 1287 return (error); 1288 } 1289 1290 /* 1291 * Leave from multicast groups we have joined for the interface. 1292 */ 1293 static int 1294 in6_purgeaddr_mc(struct ifnet *ifp, struct in6_ifaddr *ia, struct ifaddr *ifa0) 1295 { 1296 struct in6_multi_mship *imm; 1297 1298 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1299 LIST_REMOVE(imm, i6mm_chain); 1300 in6_leavegroup(imm); 1301 } 1302 return (0); 1303 } 1304 1305 void 1306 in6_purgeaddr(struct ifaddr *ifa) 1307 { 1308 struct ifnet *ifp = ifa->ifa_ifp; 1309 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1310 int plen, error; 1311 struct ifaddr *ifa0; 1312 1313 if (ifa->ifa_carp) 1314 (*carp_detach_p)(ifa); 1315 1316 /* 1317 * find another IPv6 address as the gateway for the 1318 * link-local and node-local all-nodes multicast 1319 * address routes 1320 */ 1321 IF_ADDR_RLOCK(ifp); 1322 TAILQ_FOREACH(ifa0, &ifp->if_addrhead, ifa_link) { 1323 if ((ifa0->ifa_addr->sa_family != AF_INET6) || 1324 memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr, 1325 &ia->ia_addr.sin6_addr, sizeof(struct in6_addr)) == 0) 1326 continue; 1327 else 1328 break; 1329 } 1330 if (ifa0 != NULL) 1331 ifa_ref(ifa0); 1332 IF_ADDR_RUNLOCK(ifp); 1333 1334 /* 1335 * Remove the loopback route to the interface address. 1336 * The check for the current setting of "nd6_useloopback" 1337 * is not needed. 1338 */ 1339 if (ia->ia_flags & IFA_RTSELF) { 1340 error = ifa_del_loopback_route((struct ifaddr *)ia, 1341 (struct sockaddr *)&ia->ia_addr); 1342 if (error == 0) 1343 ia->ia_flags &= ~IFA_RTSELF; 1344 } 1345 1346 /* stop DAD processing */ 1347 nd6_dad_stop(ifa); 1348 1349 /* Remove local address entry from lltable. */ 1350 nd6_rem_ifa_lle(ia); 1351 1352 /* Leave multicast groups. */ 1353 error = in6_purgeaddr_mc(ifp, ia, ifa0); 1354 1355 if (ifa0 != NULL) 1356 ifa_free(ifa0); 1357 1358 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1359 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) { 1360 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags | 1361 (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0); 1362 if (error != 0) 1363 log(LOG_INFO, "%s: err=%d, destination address delete " 1364 "failed\n", __func__, error); 1365 ia->ia_flags &= ~IFA_ROUTE; 1366 } 1367 1368 in6_unlink_ifa(ia, ifp); 1369 } 1370 1371 static void 1372 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1373 { 1374 1375 IF_ADDR_WLOCK(ifp); 1376 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1377 IF_ADDR_WUNLOCK(ifp); 1378 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1379 1380 /* 1381 * Defer the release of what might be the last reference to the 1382 * in6_ifaddr so that it can't be freed before the remainder of the 1383 * cleanup. 1384 */ 1385 IN6_IFADDR_WLOCK(); 1386 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 1387 LIST_REMOVE(ia, ia6_hash); 1388 IN6_IFADDR_WUNLOCK(); 1389 1390 /* 1391 * Release the reference to the base prefix. There should be a 1392 * positive reference. 1393 */ 1394 if (ia->ia6_ndpr == NULL) { 1395 nd6log((LOG_NOTICE, 1396 "in6_unlink_ifa: autoconf'ed address " 1397 "%p has no prefix\n", ia)); 1398 } else { 1399 ia->ia6_ndpr->ndpr_refcnt--; 1400 ia->ia6_ndpr = NULL; 1401 } 1402 1403 /* 1404 * Also, if the address being removed is autoconf'ed, call 1405 * pfxlist_onlink_check() since the release might affect the status of 1406 * other (detached) addresses. 1407 */ 1408 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1409 pfxlist_onlink_check(); 1410 } 1411 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1412 } 1413 1414 /* 1415 * Notifies other other subsystems about address change/arrival: 1416 * 1) Notifies device handler on first IPv6 address assignment 1417 * 2) Handle routing table changes for P2P links and route 1418 * 3) Handle routing table changes for address host route 1419 */ 1420 static int 1421 in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia, 1422 struct in6_aliasreq *ifra, int hostIsNew) 1423 { 1424 int error = 0, plen, ifacount = 0; 1425 struct ifaddr *ifa; 1426 struct sockaddr_in6 *pdst; 1427 char ip6buf[INET6_ADDRSTRLEN]; 1428 1429 /* 1430 * Give the interface a chance to initialize 1431 * if this is its first address, 1432 */ 1433 if (hostIsNew != 0) { 1434 IF_ADDR_RLOCK(ifp); 1435 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1436 if (ifa->ifa_addr->sa_family != AF_INET6) 1437 continue; 1438 ifacount++; 1439 } 1440 IF_ADDR_RUNLOCK(ifp); 1441 } 1442 1443 if (ifacount <= 1 && ifp->if_ioctl) { 1444 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1445 if (error) 1446 return (error); 1447 } 1448 1449 /* 1450 * If a new destination address is specified, scrub the old one and 1451 * install the new destination. Note that the interface must be 1452 * p2p or loopback. 1453 */ 1454 pdst = &ifra->ifra_dstaddr; 1455 if (pdst->sin6_family == AF_INET6 && 1456 !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1457 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1458 (rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0)) { 1459 nd6log((LOG_ERR, "in6_update_ifa_internal: failed to " 1460 "remove a route to the old destination: %s\n", 1461 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1462 /* proceed anyway... */ 1463 } else 1464 ia->ia_flags &= ~IFA_ROUTE; 1465 ia->ia_dstaddr = *pdst; 1466 } 1467 1468 /* 1469 * If a new destination address is specified for a point-to-point 1470 * interface, install a route to the destination as an interface 1471 * direct route. 1472 * XXX: the logic below rejects assigning multiple addresses on a p2p 1473 * interface that share the same destination. 1474 */ 1475 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1476 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 && 1477 ia->ia_dstaddr.sin6_family == AF_INET6) { 1478 int rtflags = RTF_UP | RTF_HOST; 1479 /* 1480 * Handle the case for ::1 . 1481 */ 1482 if (ifp->if_flags & IFF_LOOPBACK) 1483 ia->ia_flags |= IFA_RTSELF; 1484 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags); 1485 if (error) 1486 return (error); 1487 ia->ia_flags |= IFA_ROUTE; 1488 } 1489 1490 /* 1491 * add a loopback route to self if not exists 1492 */ 1493 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) { 1494 error = ifa_add_loopback_route((struct ifaddr *)ia, 1495 (struct sockaddr *)&ia->ia_addr); 1496 if (error == 0) 1497 ia->ia_flags |= IFA_RTSELF; 1498 } 1499 1500 return (error); 1501 } 1502 1503 /* 1504 * Find an IPv6 interface link-local address specific to an interface. 1505 * ifaddr is returned referenced. 1506 */ 1507 struct in6_ifaddr * 1508 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1509 { 1510 struct ifaddr *ifa; 1511 1512 IF_ADDR_RLOCK(ifp); 1513 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1514 if (ifa->ifa_addr->sa_family != AF_INET6) 1515 continue; 1516 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1517 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1518 ignoreflags) != 0) 1519 continue; 1520 ifa_ref(ifa); 1521 break; 1522 } 1523 } 1524 IF_ADDR_RUNLOCK(ifp); 1525 1526 return ((struct in6_ifaddr *)ifa); 1527 } 1528 1529 1530 /* 1531 * find the internet address corresponding to a given address. 1532 * ifaddr is returned referenced. 1533 */ 1534 struct in6_ifaddr * 1535 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid) 1536 { 1537 struct in6_ifaddr *ia; 1538 1539 IN6_IFADDR_RLOCK(); 1540 LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) { 1541 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1542 if (zoneid != 0 && 1543 zoneid != ia->ia_addr.sin6_scope_id) 1544 continue; 1545 ifa_ref(&ia->ia_ifa); 1546 break; 1547 } 1548 } 1549 IN6_IFADDR_RUNLOCK(); 1550 return (ia); 1551 } 1552 1553 /* 1554 * find the internet address corresponding to a given interface and address. 1555 * ifaddr is returned referenced. 1556 */ 1557 struct in6_ifaddr * 1558 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr) 1559 { 1560 struct ifaddr *ifa; 1561 1562 IF_ADDR_RLOCK(ifp); 1563 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1564 if (ifa->ifa_addr->sa_family != AF_INET6) 1565 continue; 1566 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1567 ifa_ref(ifa); 1568 break; 1569 } 1570 } 1571 IF_ADDR_RUNLOCK(ifp); 1572 1573 return ((struct in6_ifaddr *)ifa); 1574 } 1575 1576 /* 1577 * Find a link-local scoped address on ifp and return it if any. 1578 */ 1579 struct in6_ifaddr * 1580 in6ifa_llaonifp(struct ifnet *ifp) 1581 { 1582 struct sockaddr_in6 *sin6; 1583 struct ifaddr *ifa; 1584 1585 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1586 return (NULL); 1587 if_addr_rlock(ifp); 1588 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1589 if (ifa->ifa_addr->sa_family != AF_INET6) 1590 continue; 1591 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 1592 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 1593 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) || 1594 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr)) 1595 break; 1596 } 1597 if_addr_runlock(ifp); 1598 1599 return ((struct in6_ifaddr *)ifa); 1600 } 1601 1602 /* 1603 * Convert IP6 address to printable (loggable) representation. Caller 1604 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 1605 */ 1606 static char digits[] = "0123456789abcdef"; 1607 char * 1608 ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 1609 { 1610 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0; 1611 char *cp; 1612 const u_int16_t *a = (const u_int16_t *)addr; 1613 const u_int8_t *d; 1614 int dcolon = 0, zero = 0; 1615 1616 cp = ip6buf; 1617 1618 for (i = 0; i < 8; i++) { 1619 if (*(a + i) == 0) { 1620 cnt++; 1621 if (cnt == 1) 1622 idx = i; 1623 } 1624 else if (maxcnt < cnt) { 1625 maxcnt = cnt; 1626 index = idx; 1627 cnt = 0; 1628 } 1629 } 1630 if (maxcnt < cnt) { 1631 maxcnt = cnt; 1632 index = idx; 1633 } 1634 1635 for (i = 0; i < 8; i++) { 1636 if (dcolon == 1) { 1637 if (*a == 0) { 1638 if (i == 7) 1639 *cp++ = ':'; 1640 a++; 1641 continue; 1642 } else 1643 dcolon = 2; 1644 } 1645 if (*a == 0) { 1646 if (dcolon == 0 && *(a + 1) == 0 && i == index) { 1647 if (i == 0) 1648 *cp++ = ':'; 1649 *cp++ = ':'; 1650 dcolon = 1; 1651 } else { 1652 *cp++ = '0'; 1653 *cp++ = ':'; 1654 } 1655 a++; 1656 continue; 1657 } 1658 d = (const u_char *)a; 1659 /* Try to eliminate leading zeros in printout like in :0001. */ 1660 zero = 1; 1661 *cp = digits[*d >> 4]; 1662 if (*cp != '0') { 1663 zero = 0; 1664 cp++; 1665 } 1666 *cp = digits[*d++ & 0xf]; 1667 if (zero == 0 || (*cp != '0')) { 1668 zero = 0; 1669 cp++; 1670 } 1671 *cp = digits[*d >> 4]; 1672 if (zero == 0 || (*cp != '0')) { 1673 zero = 0; 1674 cp++; 1675 } 1676 *cp++ = digits[*d & 0xf]; 1677 *cp++ = ':'; 1678 a++; 1679 } 1680 *--cp = '\0'; 1681 return (ip6buf); 1682 } 1683 1684 int 1685 in6_localaddr(struct in6_addr *in6) 1686 { 1687 struct in6_ifaddr *ia; 1688 1689 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1690 return 1; 1691 1692 IN6_IFADDR_RLOCK(); 1693 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 1694 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1695 &ia->ia_prefixmask.sin6_addr)) { 1696 IN6_IFADDR_RUNLOCK(); 1697 return 1; 1698 } 1699 } 1700 IN6_IFADDR_RUNLOCK(); 1701 1702 return (0); 1703 } 1704 1705 /* 1706 * Return 1 if an internet address is for the local host and configured 1707 * on one of its interfaces. 1708 */ 1709 int 1710 in6_localip(struct in6_addr *in6) 1711 { 1712 struct in6_ifaddr *ia; 1713 1714 IN6_IFADDR_RLOCK(); 1715 LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 1716 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) { 1717 IN6_IFADDR_RUNLOCK(); 1718 return (1); 1719 } 1720 } 1721 IN6_IFADDR_RUNLOCK(); 1722 return (0); 1723 } 1724 1725 int 1726 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1727 { 1728 struct in6_ifaddr *ia; 1729 1730 IN6_IFADDR_RLOCK(); 1731 LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) { 1732 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) { 1733 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 1734 IN6_IFADDR_RUNLOCK(); 1735 return (1); /* true */ 1736 } 1737 break; 1738 } 1739 } 1740 IN6_IFADDR_RUNLOCK(); 1741 1742 return (0); /* false */ 1743 } 1744 1745 /* 1746 * return length of part which dst and src are equal 1747 * hard coding... 1748 */ 1749 int 1750 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1751 { 1752 int match = 0; 1753 u_char *s = (u_char *)src, *d = (u_char *)dst; 1754 u_char *lim = s + 16, r; 1755 1756 while (s < lim) 1757 if ((r = (*d++ ^ *s++)) != 0) { 1758 while (r < 128) { 1759 match++; 1760 r <<= 1; 1761 } 1762 break; 1763 } else 1764 match += 8; 1765 return match; 1766 } 1767 1768 /* XXX: to be scope conscious */ 1769 int 1770 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1771 { 1772 int bytelen, bitlen; 1773 1774 /* sanity check */ 1775 if (0 > len || len > 128) { 1776 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1777 len); 1778 return (0); 1779 } 1780 1781 bytelen = len / 8; 1782 bitlen = len % 8; 1783 1784 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1785 return (0); 1786 if (bitlen != 0 && 1787 p1->s6_addr[bytelen] >> (8 - bitlen) != 1788 p2->s6_addr[bytelen] >> (8 - bitlen)) 1789 return (0); 1790 1791 return (1); 1792 } 1793 1794 void 1795 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1796 { 1797 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1798 int bytelen, bitlen, i; 1799 1800 /* sanity check */ 1801 if (0 > len || len > 128) { 1802 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1803 len); 1804 return; 1805 } 1806 1807 bzero(maskp, sizeof(*maskp)); 1808 bytelen = len / 8; 1809 bitlen = len % 8; 1810 for (i = 0; i < bytelen; i++) 1811 maskp->s6_addr[i] = 0xff; 1812 if (bitlen) 1813 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1814 } 1815 1816 /* 1817 * return the best address out of the same scope. if no address was 1818 * found, return the first valid address from designated IF. 1819 */ 1820 struct in6_ifaddr * 1821 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 1822 { 1823 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 1824 struct ifaddr *ifa; 1825 struct in6_ifaddr *besta = 0; 1826 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 1827 1828 dep[0] = dep[1] = NULL; 1829 1830 /* 1831 * We first look for addresses in the same scope. 1832 * If there is one, return it. 1833 * If two or more, return one which matches the dst longest. 1834 * If none, return one of global addresses assigned other ifs. 1835 */ 1836 IF_ADDR_RLOCK(ifp); 1837 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1838 if (ifa->ifa_addr->sa_family != AF_INET6) 1839 continue; 1840 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1841 continue; /* XXX: is there any case to allow anycast? */ 1842 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1843 continue; /* don't use this interface */ 1844 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1845 continue; 1846 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1847 if (V_ip6_use_deprecated) 1848 dep[0] = (struct in6_ifaddr *)ifa; 1849 continue; 1850 } 1851 1852 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 1853 /* 1854 * call in6_matchlen() as few as possible 1855 */ 1856 if (besta) { 1857 if (blen == -1) 1858 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 1859 tlen = in6_matchlen(IFA_IN6(ifa), dst); 1860 if (tlen > blen) { 1861 blen = tlen; 1862 besta = (struct in6_ifaddr *)ifa; 1863 } 1864 } else 1865 besta = (struct in6_ifaddr *)ifa; 1866 } 1867 } 1868 if (besta) { 1869 ifa_ref(&besta->ia_ifa); 1870 IF_ADDR_RUNLOCK(ifp); 1871 return (besta); 1872 } 1873 1874 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1875 if (ifa->ifa_addr->sa_family != AF_INET6) 1876 continue; 1877 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1878 continue; /* XXX: is there any case to allow anycast? */ 1879 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1880 continue; /* don't use this interface */ 1881 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1882 continue; 1883 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1884 if (V_ip6_use_deprecated) 1885 dep[1] = (struct in6_ifaddr *)ifa; 1886 continue; 1887 } 1888 1889 if (ifa != NULL) 1890 ifa_ref(ifa); 1891 IF_ADDR_RUNLOCK(ifp); 1892 return (struct in6_ifaddr *)ifa; 1893 } 1894 1895 /* use the last-resort values, that are, deprecated addresses */ 1896 if (dep[0]) { 1897 ifa_ref((struct ifaddr *)dep[0]); 1898 IF_ADDR_RUNLOCK(ifp); 1899 return dep[0]; 1900 } 1901 if (dep[1]) { 1902 ifa_ref((struct ifaddr *)dep[1]); 1903 IF_ADDR_RUNLOCK(ifp); 1904 return dep[1]; 1905 } 1906 1907 IF_ADDR_RUNLOCK(ifp); 1908 return NULL; 1909 } 1910 1911 /* 1912 * perform DAD when interface becomes IFF_UP. 1913 */ 1914 void 1915 in6_if_up(struct ifnet *ifp) 1916 { 1917 struct ifaddr *ifa; 1918 struct in6_ifaddr *ia; 1919 1920 IF_ADDR_RLOCK(ifp); 1921 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1922 if (ifa->ifa_addr->sa_family != AF_INET6) 1923 continue; 1924 ia = (struct in6_ifaddr *)ifa; 1925 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 1926 /* 1927 * The TENTATIVE flag was likely set by hand 1928 * beforehand, implicitly indicating the need for DAD. 1929 * We may be able to skip the random delay in this 1930 * case, but we impose delays just in case. 1931 */ 1932 nd6_dad_start(ifa, 1933 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 1934 } 1935 } 1936 IF_ADDR_RUNLOCK(ifp); 1937 1938 /* 1939 * special cases, like 6to4, are handled in in6_ifattach 1940 */ 1941 in6_ifattach(ifp, NULL); 1942 } 1943 1944 int 1945 in6if_do_dad(struct ifnet *ifp) 1946 { 1947 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 1948 return (0); 1949 1950 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1951 return (0); 1952 1953 switch (ifp->if_type) { 1954 #ifdef IFT_DUMMY 1955 case IFT_DUMMY: 1956 #endif 1957 case IFT_FAITH: 1958 /* 1959 * These interfaces do not have the IFF_LOOPBACK flag, 1960 * but loop packets back. We do not have to do DAD on such 1961 * interfaces. We should even omit it, because loop-backed 1962 * NS would confuse the DAD procedure. 1963 */ 1964 return (0); 1965 default: 1966 /* 1967 * Our DAD routine requires the interface up and running. 1968 * However, some interfaces can be up before the RUNNING 1969 * status. Additionaly, users may try to assign addresses 1970 * before the interface becomes up (or running). 1971 * We simply skip DAD in such a case as a work around. 1972 * XXX: we should rather mark "tentative" on such addresses, 1973 * and do DAD after the interface becomes ready. 1974 */ 1975 if (!((ifp->if_flags & IFF_UP) && 1976 (ifp->if_drv_flags & IFF_DRV_RUNNING))) 1977 return (0); 1978 1979 return (1); 1980 } 1981 } 1982 1983 /* 1984 * Calculate max IPv6 MTU through all the interfaces and store it 1985 * to in6_maxmtu. 1986 */ 1987 void 1988 in6_setmaxmtu(void) 1989 { 1990 unsigned long maxmtu = 0; 1991 struct ifnet *ifp; 1992 1993 IFNET_RLOCK_NOSLEEP(); 1994 TAILQ_FOREACH(ifp, &V_ifnet, if_list) { 1995 /* this function can be called during ifnet initialization */ 1996 if (!ifp->if_afdata[AF_INET6]) 1997 continue; 1998 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 1999 IN6_LINKMTU(ifp) > maxmtu) 2000 maxmtu = IN6_LINKMTU(ifp); 2001 } 2002 IFNET_RUNLOCK_NOSLEEP(); 2003 if (maxmtu) /* update only when maxmtu is positive */ 2004 V_in6_maxmtu = maxmtu; 2005 } 2006 2007 /* 2008 * Provide the length of interface identifiers to be used for the link attached 2009 * to the given interface. The length should be defined in "IPv6 over 2010 * xxx-link" document. Note that address architecture might also define 2011 * the length for a particular set of address prefixes, regardless of the 2012 * link type. As clarified in rfc2462bis, those two definitions should be 2013 * consistent, and those really are as of August 2004. 2014 */ 2015 int 2016 in6_if2idlen(struct ifnet *ifp) 2017 { 2018 switch (ifp->if_type) { 2019 case IFT_ETHER: /* RFC2464 */ 2020 #ifdef IFT_PROPVIRTUAL 2021 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2022 #endif 2023 #ifdef IFT_L2VLAN 2024 case IFT_L2VLAN: /* ditto */ 2025 #endif 2026 #ifdef IFT_IEEE80211 2027 case IFT_IEEE80211: /* ditto */ 2028 #endif 2029 #ifdef IFT_MIP 2030 case IFT_MIP: /* ditto */ 2031 #endif 2032 case IFT_INFINIBAND: 2033 return (64); 2034 case IFT_FDDI: /* RFC2467 */ 2035 return (64); 2036 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 2037 return (64); 2038 case IFT_PPP: /* RFC2472 */ 2039 return (64); 2040 case IFT_ARCNET: /* RFC2497 */ 2041 return (64); 2042 case IFT_FRELAY: /* RFC2590 */ 2043 return (64); 2044 case IFT_IEEE1394: /* RFC3146 */ 2045 return (64); 2046 case IFT_GIF: 2047 return (64); /* draft-ietf-v6ops-mech-v2-07 */ 2048 case IFT_LOOP: 2049 return (64); /* XXX: is this really correct? */ 2050 default: 2051 /* 2052 * Unknown link type: 2053 * It might be controversial to use the today's common constant 2054 * of 64 for these cases unconditionally. For full compliance, 2055 * we should return an error in this case. On the other hand, 2056 * if we simply miss the standard for the link type or a new 2057 * standard is defined for a new link type, the IFID length 2058 * is very likely to be the common constant. As a compromise, 2059 * we always use the constant, but make an explicit notice 2060 * indicating the "unknown" case. 2061 */ 2062 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2063 return (64); 2064 } 2065 } 2066 2067 #include <sys/sysctl.h> 2068 2069 struct in6_llentry { 2070 struct llentry base; 2071 struct sockaddr_in6 l3_addr6; 2072 }; 2073 2074 /* 2075 * Deletes an address from the address table. 2076 * This function is called by the timer functions 2077 * such as arptimer() and nd6_llinfo_timer(), and 2078 * the caller does the locking. 2079 */ 2080 static void 2081 in6_lltable_free(struct lltable *llt, struct llentry *lle) 2082 { 2083 LLE_WUNLOCK(lle); 2084 LLE_LOCK_DESTROY(lle); 2085 free(lle, M_LLTABLE); 2086 } 2087 2088 static struct llentry * 2089 in6_lltable_new(const struct sockaddr *l3addr, u_int flags) 2090 { 2091 struct in6_llentry *lle; 2092 2093 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 2094 if (lle == NULL) /* NB: caller generates msg */ 2095 return NULL; 2096 2097 lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr; 2098 lle->base.lle_refcnt = 1; 2099 lle->base.lle_free = in6_lltable_free; 2100 LLE_LOCK_INIT(&lle->base); 2101 callout_init_rw(&lle->base.ln_timer_ch, &lle->base.lle_lock, 2102 CALLOUT_RETURNUNLOCKED); 2103 2104 return (&lle->base); 2105 } 2106 2107 static void 2108 in6_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix, 2109 const struct sockaddr *mask, u_int flags) 2110 { 2111 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix; 2112 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask; 2113 struct llentry *lle, *next; 2114 int i; 2115 2116 /* 2117 * (flags & LLE_STATIC) means deleting all entries 2118 * including static ND6 entries. 2119 */ 2120 IF_AFDATA_WLOCK(llt->llt_ifp); 2121 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 2122 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 2123 if (IN6_ARE_MASKED_ADDR_EQUAL( 2124 &satosin6(L3_ADDR(lle))->sin6_addr, 2125 &pfx->sin6_addr, &msk->sin6_addr) && 2126 ((flags & LLE_STATIC) || 2127 !(lle->la_flags & LLE_STATIC))) { 2128 LLE_WLOCK(lle); 2129 if (callout_stop(&lle->la_timer)) 2130 LLE_REMREF(lle); 2131 llentry_free(lle); 2132 } 2133 } 2134 } 2135 IF_AFDATA_WUNLOCK(llt->llt_ifp); 2136 } 2137 2138 static int 2139 in6_lltable_rtcheck(struct ifnet *ifp, 2140 u_int flags, 2141 const struct sockaddr *l3addr) 2142 { 2143 struct rtentry *rt; 2144 char ip6buf[INET6_ADDRSTRLEN]; 2145 2146 KASSERT(l3addr->sa_family == AF_INET6, 2147 ("sin_family %d", l3addr->sa_family)); 2148 2149 /* Our local addresses are always only installed on the default FIB. */ 2150 /* XXX rtalloc1 should take a const param */ 2151 rt = in6_rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0, 2152 RT_DEFAULT_FIB); 2153 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 2154 struct ifaddr *ifa; 2155 /* 2156 * Create an ND6 cache for an IPv6 neighbor 2157 * that is not covered by our own prefix. 2158 */ 2159 /* XXX ifaof_ifpforaddr should take a const param */ 2160 ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp); 2161 if (ifa != NULL) { 2162 ifa_free(ifa); 2163 if (rt != NULL) 2164 RTFREE_LOCKED(rt); 2165 return 0; 2166 } 2167 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2168 ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr)); 2169 if (rt != NULL) 2170 RTFREE_LOCKED(rt); 2171 return EINVAL; 2172 } 2173 RTFREE_LOCKED(rt); 2174 return 0; 2175 } 2176 2177 static struct llentry * 2178 in6_lltable_lookup(struct lltable *llt, u_int flags, 2179 const struct sockaddr *l3addr) 2180 { 2181 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2182 struct ifnet *ifp = llt->llt_ifp; 2183 struct llentry *lle; 2184 struct llentries *lleh; 2185 u_int hashkey; 2186 2187 IF_AFDATA_LOCK_ASSERT(ifp); 2188 KASSERT(l3addr->sa_family == AF_INET6, 2189 ("sin_family %d", l3addr->sa_family)); 2190 2191 hashkey = sin6->sin6_addr.s6_addr32[3]; 2192 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 2193 LIST_FOREACH(lle, lleh, lle_next) { 2194 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle); 2195 if (lle->la_flags & LLE_DELETED) 2196 continue; 2197 if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr, 2198 sizeof(struct in6_addr)) == 0) 2199 break; 2200 } 2201 2202 if (lle == NULL) { 2203 if (!(flags & LLE_CREATE)) 2204 return (NULL); 2205 IF_AFDATA_WLOCK_ASSERT(ifp); 2206 /* 2207 * A route that covers the given address must have 2208 * been installed 1st because we are doing a resolution, 2209 * verify this. 2210 */ 2211 if (!(flags & LLE_IFADDR) && 2212 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2213 return NULL; 2214 2215 lle = in6_lltable_new(l3addr, flags); 2216 if (lle == NULL) { 2217 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2218 return NULL; 2219 } 2220 lle->la_flags = flags & ~LLE_CREATE; 2221 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 2222 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 2223 lle->la_flags |= (LLE_VALID | LLE_STATIC); 2224 } 2225 2226 lle->lle_tbl = llt; 2227 lle->lle_head = lleh; 2228 lle->la_flags |= LLE_LINKED; 2229 LIST_INSERT_HEAD(lleh, lle, lle_next); 2230 } else if (flags & LLE_DELETE) { 2231 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 2232 LLE_WLOCK(lle); 2233 lle->la_flags |= LLE_DELETED; 2234 #ifdef DIAGNOSTIC 2235 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2236 #endif 2237 if ((lle->la_flags & 2238 (LLE_STATIC | LLE_IFADDR)) == LLE_STATIC) 2239 llentry_free(lle); 2240 else 2241 LLE_WUNLOCK(lle); 2242 } 2243 lle = (void *)-1; 2244 } 2245 if (LLE_IS_VALID(lle)) { 2246 if (flags & LLE_EXCLUSIVE) 2247 LLE_WLOCK(lle); 2248 else 2249 LLE_RLOCK(lle); 2250 } 2251 return (lle); 2252 } 2253 2254 static int 2255 in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 2256 { 2257 struct ifnet *ifp = llt->llt_ifp; 2258 struct llentry *lle; 2259 /* XXX stack use */ 2260 struct { 2261 struct rt_msghdr rtm; 2262 struct sockaddr_in6 sin6; 2263 /* 2264 * ndp.c assumes that sdl is word aligned 2265 */ 2266 #ifdef __LP64__ 2267 uint32_t pad; 2268 #endif 2269 struct sockaddr_dl sdl; 2270 } ndpc; 2271 int i, error; 2272 2273 if (ifp->if_flags & IFF_LOOPBACK) 2274 return 0; 2275 2276 LLTABLE_LOCK_ASSERT(); 2277 2278 error = 0; 2279 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 2280 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 2281 struct sockaddr_dl *sdl; 2282 2283 /* skip deleted or invalid entries */ 2284 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID) 2285 continue; 2286 /* Skip if jailed and not a valid IP of the prison. */ 2287 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 2288 continue; 2289 /* 2290 * produce a msg made of: 2291 * struct rt_msghdr; 2292 * struct sockaddr_in6 (IPv6) 2293 * struct sockaddr_dl; 2294 */ 2295 bzero(&ndpc, sizeof(ndpc)); 2296 ndpc.rtm.rtm_msglen = sizeof(ndpc); 2297 ndpc.rtm.rtm_version = RTM_VERSION; 2298 ndpc.rtm.rtm_type = RTM_GET; 2299 ndpc.rtm.rtm_flags = RTF_UP; 2300 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 2301 ndpc.sin6.sin6_family = AF_INET6; 2302 ndpc.sin6.sin6_len = sizeof(ndpc.sin6); 2303 bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle)); 2304 if (V_deembed_scopeid) 2305 sa6_recoverscope(&ndpc.sin6); 2306 2307 /* publish */ 2308 if (lle->la_flags & LLE_PUB) 2309 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE; 2310 2311 sdl = &ndpc.sdl; 2312 sdl->sdl_family = AF_LINK; 2313 sdl->sdl_len = sizeof(*sdl); 2314 sdl->sdl_alen = ifp->if_addrlen; 2315 sdl->sdl_index = ifp->if_index; 2316 sdl->sdl_type = ifp->if_type; 2317 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 2318 ndpc.rtm.rtm_rmx.rmx_expire = 2319 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 2320 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 2321 if (lle->la_flags & LLE_STATIC) 2322 ndpc.rtm.rtm_flags |= RTF_STATIC; 2323 ndpc.rtm.rtm_index = ifp->if_index; 2324 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc)); 2325 if (error) 2326 break; 2327 } 2328 } 2329 return error; 2330 } 2331 2332 void * 2333 in6_domifattach(struct ifnet *ifp) 2334 { 2335 struct in6_ifextra *ext; 2336 2337 /* There are not IPv6-capable interfaces. */ 2338 switch (ifp->if_type) { 2339 case IFT_PFLOG: 2340 case IFT_PFSYNC: 2341 case IFT_USB: 2342 return (NULL); 2343 } 2344 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2345 bzero(ext, sizeof(*ext)); 2346 2347 ext->in6_ifstat = malloc(sizeof(counter_u64_t) * 2348 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK); 2349 COUNTER_ARRAY_ALLOC(ext->in6_ifstat, 2350 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK); 2351 2352 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) * 2353 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR, 2354 M_WAITOK); 2355 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat, 2356 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK); 2357 2358 ext->nd_ifinfo = nd6_ifattach(ifp); 2359 ext->scope6_id = scope6_ifattach(ifp); 2360 ext->lltable = lltable_init(ifp, AF_INET6); 2361 if (ext->lltable != NULL) { 2362 ext->lltable->llt_prefix_free = in6_lltable_prefix_free; 2363 ext->lltable->llt_lookup = in6_lltable_lookup; 2364 ext->lltable->llt_dump = in6_lltable_dump; 2365 } 2366 2367 ext->mld_ifinfo = mld_domifattach(ifp); 2368 2369 return ext; 2370 } 2371 2372 void 2373 in6_domifdetach(struct ifnet *ifp, void *aux) 2374 { 2375 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2376 2377 mld_domifdetach(ifp); 2378 scope6_ifdetach(ext->scope6_id); 2379 nd6_ifdetach(ext->nd_ifinfo); 2380 lltable_free(ext->lltable); 2381 COUNTER_ARRAY_FREE(ext->in6_ifstat, 2382 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 2383 free(ext->in6_ifstat, M_IFADDR); 2384 COUNTER_ARRAY_FREE(ext->icmp6_ifstat, 2385 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 2386 free(ext->icmp6_ifstat, M_IFADDR); 2387 free(ext, M_IFADDR); 2388 } 2389 2390 /* 2391 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2392 * v4 mapped addr or v4 compat addr 2393 */ 2394 void 2395 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2396 { 2397 2398 bzero(sin, sizeof(*sin)); 2399 sin->sin_len = sizeof(struct sockaddr_in); 2400 sin->sin_family = AF_INET; 2401 sin->sin_port = sin6->sin6_port; 2402 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2403 } 2404 2405 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2406 void 2407 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2408 { 2409 bzero(sin6, sizeof(*sin6)); 2410 sin6->sin6_len = sizeof(struct sockaddr_in6); 2411 sin6->sin6_family = AF_INET6; 2412 sin6->sin6_port = sin->sin_port; 2413 sin6->sin6_addr.s6_addr32[0] = 0; 2414 sin6->sin6_addr.s6_addr32[1] = 0; 2415 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2416 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2417 } 2418 2419 /* Convert sockaddr_in6 into sockaddr_in. */ 2420 void 2421 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2422 { 2423 struct sockaddr_in *sin_p; 2424 struct sockaddr_in6 sin6; 2425 2426 /* 2427 * Save original sockaddr_in6 addr and convert it 2428 * to sockaddr_in. 2429 */ 2430 sin6 = *(struct sockaddr_in6 *)nam; 2431 sin_p = (struct sockaddr_in *)nam; 2432 in6_sin6_2_sin(sin_p, &sin6); 2433 } 2434 2435 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2436 void 2437 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2438 { 2439 struct sockaddr_in *sin_p; 2440 struct sockaddr_in6 *sin6_p; 2441 2442 sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK); 2443 sin_p = (struct sockaddr_in *)*nam; 2444 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2445 free(*nam, M_SONAME); 2446 *nam = (struct sockaddr *)sin6_p; 2447 } 2448