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