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/errno.h> 72 #include <sys/jail.h> 73 #include <sys/malloc.h> 74 #include <sys/socket.h> 75 #include <sys/socketvar.h> 76 #include <sys/sockio.h> 77 #include <sys/systm.h> 78 #include <sys/priv.h> 79 #include <sys/proc.h> 80 #include <sys/time.h> 81 #include <sys/kernel.h> 82 #include <sys/syslog.h> 83 84 #include <net/if.h> 85 #include <net/if_var.h> 86 #include <net/if_types.h> 87 #include <net/route.h> 88 #include <net/if_dl.h> 89 #include <net/vnet.h> 90 91 #include <netinet/in.h> 92 #include <netinet/in_var.h> 93 #include <net/if_llatbl.h> 94 #include <netinet/if_ether.h> 95 #include <netinet/in_systm.h> 96 #include <netinet/ip.h> 97 #include <netinet/in_pcb.h> 98 #include <netinet/ip_carp.h> 99 100 #include <netinet/ip6.h> 101 #include <netinet6/ip6_var.h> 102 #include <netinet6/nd6.h> 103 #include <netinet6/mld6_var.h> 104 #include <netinet6/ip6_mroute.h> 105 #include <netinet6/in6_ifattach.h> 106 #include <netinet6/scope6_var.h> 107 #include <netinet6/in6_pcb.h> 108 109 /* 110 * Definitions of some costant IP6 addresses. 111 */ 112 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 113 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 114 const struct in6_addr in6addr_nodelocal_allnodes = 115 IN6ADDR_NODELOCAL_ALLNODES_INIT; 116 const struct in6_addr in6addr_linklocal_allnodes = 117 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 118 const struct in6_addr in6addr_linklocal_allrouters = 119 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 120 const struct in6_addr in6addr_linklocal_allv2routers = 121 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT; 122 123 const struct in6_addr in6mask0 = IN6MASK0; 124 const struct in6_addr in6mask32 = IN6MASK32; 125 const struct in6_addr in6mask64 = IN6MASK64; 126 const struct in6_addr in6mask96 = IN6MASK96; 127 const struct in6_addr in6mask128 = IN6MASK128; 128 129 const struct sockaddr_in6 sa6_any = 130 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 }; 131 132 static int in6_lifaddr_ioctl(struct socket *, u_long, caddr_t, 133 struct ifnet *, struct thread *); 134 static int in6_ifinit(struct ifnet *, struct in6_ifaddr *, 135 struct sockaddr_in6 *, int); 136 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 137 138 int (*faithprefix_p)(struct in6_addr *); 139 140 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 141 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 142 143 void 144 in6_ifaddloop(struct ifaddr *ifa) 145 { 146 struct sockaddr_dl gateway; 147 struct sockaddr_in6 mask, addr; 148 struct rtentry rt; 149 struct in6_ifaddr *ia; 150 struct ifnet *ifp; 151 struct llentry *ln; 152 153 ia = ifa2ia6(ifa); 154 ifp = ifa->ifa_ifp; 155 IF_AFDATA_LOCK(ifp); 156 ifa->ifa_rtrequest = nd6_rtrequest; 157 ln = lla_lookup(LLTABLE6(ifp), (LLE_CREATE | LLE_IFADDR | 158 LLE_EXCLUSIVE), (struct sockaddr *)&ia->ia_addr); 159 IF_AFDATA_UNLOCK(ifp); 160 if (ln != NULL) { 161 ln->la_expire = 0; /* for IPv6 this means permanent */ 162 ln->ln_state = ND6_LLINFO_REACHABLE; 163 /* 164 * initialize for rtmsg generation 165 */ 166 bzero(&gateway, sizeof(gateway)); 167 gateway.sdl_len = sizeof(gateway); 168 gateway.sdl_family = AF_LINK; 169 gateway.sdl_nlen = 0; 170 gateway.sdl_alen = 6; 171 memcpy(gateway.sdl_data, &ln->ll_addr.mac_aligned, 172 sizeof(ln->ll_addr)); 173 LLE_WUNLOCK(ln); 174 } 175 176 bzero(&rt, sizeof(rt)); 177 rt.rt_gateway = (struct sockaddr *)&gateway; 178 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 179 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr)); 180 rt_mask(&rt) = (struct sockaddr *)&mask; 181 rt_key(&rt) = (struct sockaddr *)&addr; 182 rt.rt_flags = RTF_UP | RTF_HOST | RTF_STATIC; 183 /* Announce arrival of local address to all FIBs. */ 184 rt_newaddrmsg(RTM_ADD, ifa, 0, &rt); 185 } 186 187 void 188 in6_ifremloop(struct ifaddr *ifa) 189 { 190 struct sockaddr_dl gateway; 191 struct sockaddr_in6 mask, addr; 192 struct rtentry rt0; 193 struct in6_ifaddr *ia; 194 struct ifnet *ifp; 195 196 ia = ifa2ia6(ifa); 197 ifp = ifa->ifa_ifp; 198 IF_AFDATA_LOCK(ifp); 199 lla_lookup(LLTABLE6(ifp), (LLE_DELETE | LLE_IFADDR), 200 (struct sockaddr *)&ia->ia_addr); 201 IF_AFDATA_UNLOCK(ifp); 202 203 /* 204 * initialize for rtmsg generation 205 */ 206 bzero(&gateway, sizeof(gateway)); 207 gateway.sdl_len = sizeof(gateway); 208 gateway.sdl_family = AF_LINK; 209 gateway.sdl_nlen = 0; 210 gateway.sdl_alen = ifp->if_addrlen; 211 bzero(&rt0, sizeof(rt0)); 212 rt0.rt_gateway = (struct sockaddr *)&gateway; 213 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 214 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr)); 215 rt_mask(&rt0) = (struct sockaddr *)&mask; 216 rt_key(&rt0) = (struct sockaddr *)&addr; 217 rt0.rt_flags = RTF_HOST | RTF_STATIC; 218 /* Announce removal of local address to all FIBs. */ 219 rt_newaddrmsg(RTM_DELETE, ifa, 0, &rt0); 220 } 221 222 int 223 in6_mask2len(struct in6_addr *mask, u_char *lim0) 224 { 225 int x = 0, y; 226 u_char *lim = lim0, *p; 227 228 /* ignore the scope_id part */ 229 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 230 lim = (u_char *)mask + sizeof(*mask); 231 for (p = (u_char *)mask; p < lim; x++, p++) { 232 if (*p != 0xff) 233 break; 234 } 235 y = 0; 236 if (p < lim) { 237 for (y = 0; y < 8; y++) { 238 if ((*p & (0x80 >> y)) == 0) 239 break; 240 } 241 } 242 243 /* 244 * when the limit pointer is given, do a stricter check on the 245 * remaining bits. 246 */ 247 if (p < lim) { 248 if (y != 0 && (*p & (0x00ff >> y)) != 0) 249 return (-1); 250 for (p = p + 1; p < lim; p++) 251 if (*p != 0) 252 return (-1); 253 } 254 255 return x * 8 + y; 256 } 257 258 #ifdef COMPAT_FREEBSD32 259 struct in6_ndifreq32 { 260 char ifname[IFNAMSIZ]; 261 uint32_t ifindex; 262 }; 263 #define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32) 264 #endif 265 266 int 267 in6_control(struct socket *so, u_long cmd, caddr_t data, 268 struct ifnet *ifp, struct thread *td) 269 { 270 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 271 struct in6_ifaddr *ia = NULL; 272 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 273 struct sockaddr_in6 *sa6; 274 int carp_attached = 0; 275 int error; 276 u_long ocmd = cmd; 277 278 /* 279 * Compat to make pre-10.x ifconfig(8) operable. 280 */ 281 if (cmd == OSIOCAIFADDR_IN6) 282 cmd = SIOCAIFADDR_IN6; 283 284 switch (cmd) { 285 case SIOCGETSGCNT_IN6: 286 case SIOCGETMIFCNT_IN6: 287 /* 288 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c. 289 * We cannot see how that would be needed, so do not adjust the 290 * KPI blindly; more likely should clean up the IPv4 variant. 291 */ 292 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP); 293 } 294 295 switch(cmd) { 296 case SIOCAADDRCTL_POLICY: 297 case SIOCDADDRCTL_POLICY: 298 if (td != NULL) { 299 error = priv_check(td, PRIV_NETINET_ADDRCTRL6); 300 if (error) 301 return (error); 302 } 303 return (in6_src_ioctl(cmd, data)); 304 } 305 306 if (ifp == NULL) 307 return (EOPNOTSUPP); 308 309 switch (cmd) { 310 case SIOCSNDFLUSH_IN6: 311 case SIOCSPFXFLUSH_IN6: 312 case SIOCSRTRFLUSH_IN6: 313 case SIOCSDEFIFACE_IN6: 314 case SIOCSIFINFO_FLAGS: 315 case SIOCSIFINFO_IN6: 316 if (td != NULL) { 317 error = priv_check(td, PRIV_NETINET_ND6); 318 if (error) 319 return (error); 320 } 321 /* FALLTHROUGH */ 322 case OSIOCGIFINFO_IN6: 323 case SIOCGIFINFO_IN6: 324 case SIOCGDRLST_IN6: 325 case SIOCGPRLST_IN6: 326 case SIOCGNBRINFO_IN6: 327 case SIOCGDEFIFACE_IN6: 328 return (nd6_ioctl(cmd, data, ifp)); 329 330 #ifdef COMPAT_FREEBSD32 331 case SIOCGDEFIFACE32_IN6: 332 { 333 struct in6_ndifreq ndif; 334 struct in6_ndifreq32 *ndif32; 335 336 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif, 337 ifp); 338 if (error) 339 return (error); 340 ndif32 = (struct in6_ndifreq32 *)data; 341 ndif32->ifindex = ndif.ifindex; 342 return (0); 343 } 344 #endif 345 } 346 347 switch (cmd) { 348 case SIOCSIFPREFIX_IN6: 349 case SIOCDIFPREFIX_IN6: 350 case SIOCAIFPREFIX_IN6: 351 case SIOCCIFPREFIX_IN6: 352 case SIOCSGIFPREFIX_IN6: 353 case SIOCGIFPREFIX_IN6: 354 log(LOG_NOTICE, 355 "prefix ioctls are now invalidated. " 356 "please use ifconfig.\n"); 357 return (EOPNOTSUPP); 358 } 359 360 switch (cmd) { 361 case SIOCSSCOPE6: 362 if (td != NULL) { 363 error = priv_check(td, PRIV_NETINET_SCOPE6); 364 if (error) 365 return (error); 366 } 367 return (scope6_set(ifp, 368 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 369 case SIOCGSCOPE6: 370 return (scope6_get(ifp, 371 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 372 case SIOCGSCOPE6DEF: 373 return (scope6_get_default((struct scope6_id *) 374 ifr->ifr_ifru.ifru_scope_id)); 375 } 376 377 switch (cmd) { 378 case SIOCALIFADDR: 379 if (td != NULL) { 380 error = priv_check(td, PRIV_NET_ADDIFADDR); 381 if (error) 382 return (error); 383 } 384 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 385 386 case SIOCDLIFADDR: 387 if (td != NULL) { 388 error = priv_check(td, PRIV_NET_DELIFADDR); 389 if (error) 390 return (error); 391 } 392 /* FALLTHROUGH */ 393 case SIOCGLIFADDR: 394 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 395 } 396 397 /* 398 * Find address for this interface, if it exists. 399 * 400 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 401 * only, and used the first interface address as the target of other 402 * operations (without checking ifra_addr). This was because netinet 403 * code/API assumed at most 1 interface address per interface. 404 * Since IPv6 allows a node to assign multiple addresses 405 * on a single interface, we almost always look and check the 406 * presence of ifra_addr, and reject invalid ones here. 407 * It also decreases duplicated code among SIOC*_IN6 operations. 408 */ 409 switch (cmd) { 410 case SIOCAIFADDR_IN6: 411 case SIOCSIFPHYADDR_IN6: 412 sa6 = &ifra->ifra_addr; 413 break; 414 case SIOCSIFADDR_IN6: 415 case SIOCGIFADDR_IN6: 416 case SIOCSIFDSTADDR_IN6: 417 case SIOCSIFNETMASK_IN6: 418 case SIOCGIFDSTADDR_IN6: 419 case SIOCGIFNETMASK_IN6: 420 case SIOCDIFADDR_IN6: 421 case SIOCGIFPSRCADDR_IN6: 422 case SIOCGIFPDSTADDR_IN6: 423 case SIOCGIFAFLAG_IN6: 424 case SIOCSNDFLUSH_IN6: 425 case SIOCSPFXFLUSH_IN6: 426 case SIOCSRTRFLUSH_IN6: 427 case SIOCGIFALIFETIME_IN6: 428 case SIOCSIFALIFETIME_IN6: 429 case SIOCGIFSTAT_IN6: 430 case SIOCGIFSTAT_ICMP6: 431 sa6 = &ifr->ifr_addr; 432 break; 433 default: 434 sa6 = NULL; 435 break; 436 } 437 if (sa6 && sa6->sin6_family == AF_INET6) { 438 if (sa6->sin6_scope_id != 0) 439 error = sa6_embedscope(sa6, 0); 440 else 441 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 442 if (error != 0) 443 return (error); 444 if (td != NULL && (error = prison_check_ip6(td->td_ucred, 445 &sa6->sin6_addr)) != 0) 446 return (error); 447 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 448 } else 449 ia = NULL; 450 451 switch (cmd) { 452 case SIOCSIFADDR_IN6: 453 case SIOCSIFDSTADDR_IN6: 454 case SIOCSIFNETMASK_IN6: 455 /* 456 * Since IPv6 allows a node to assign multiple addresses 457 * on a single interface, SIOCSIFxxx ioctls are deprecated. 458 */ 459 /* we decided to obsolete this command (20000704) */ 460 error = EINVAL; 461 goto out; 462 463 case SIOCDIFADDR_IN6: 464 /* 465 * for IPv4, we look for existing in_ifaddr here to allow 466 * "ifconfig if0 delete" to remove the first IPv4 address on 467 * the interface. For IPv6, as the spec allows multiple 468 * interface address from the day one, we consider "remove the 469 * first one" semantics to be not preferable. 470 */ 471 if (ia == NULL) { 472 error = EADDRNOTAVAIL; 473 goto out; 474 } 475 /* FALLTHROUGH */ 476 case SIOCAIFADDR_IN6: 477 /* 478 * We always require users to specify a valid IPv6 address for 479 * the corresponding operation. 480 */ 481 if (ifra->ifra_addr.sin6_family != AF_INET6 || 482 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 483 error = EAFNOSUPPORT; 484 goto out; 485 } 486 487 if (td != NULL) { 488 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 489 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR); 490 if (error) 491 goto out; 492 } 493 break; 494 495 case SIOCGIFADDR_IN6: 496 /* This interface is basically deprecated. use SIOCGIFCONF. */ 497 /* FALLTHROUGH */ 498 case SIOCGIFAFLAG_IN6: 499 case SIOCGIFNETMASK_IN6: 500 case SIOCGIFDSTADDR_IN6: 501 case SIOCGIFALIFETIME_IN6: 502 /* must think again about its semantics */ 503 if (ia == NULL) { 504 error = EADDRNOTAVAIL; 505 goto out; 506 } 507 break; 508 509 case SIOCSIFALIFETIME_IN6: 510 { 511 struct in6_addrlifetime *lt; 512 513 if (td != NULL) { 514 error = priv_check(td, PRIV_NETINET_ALIFETIME6); 515 if (error) 516 goto out; 517 } 518 if (ia == NULL) { 519 error = EADDRNOTAVAIL; 520 goto out; 521 } 522 /* sanity for overflow - beware unsigned */ 523 lt = &ifr->ifr_ifru.ifru_lifetime; 524 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME && 525 lt->ia6t_vltime + time_second < time_second) { 526 error = EINVAL; 527 goto out; 528 } 529 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME && 530 lt->ia6t_pltime + time_second < time_second) { 531 error = EINVAL; 532 goto out; 533 } 534 break; 535 } 536 } 537 538 switch (cmd) { 539 case SIOCGIFADDR_IN6: 540 ifr->ifr_addr = ia->ia_addr; 541 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 542 goto out; 543 break; 544 545 case SIOCGIFDSTADDR_IN6: 546 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 547 error = EINVAL; 548 goto out; 549 } 550 /* 551 * XXX: should we check if ifa_dstaddr is NULL and return 552 * an error? 553 */ 554 ifr->ifr_dstaddr = ia->ia_dstaddr; 555 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 556 goto out; 557 break; 558 559 case SIOCGIFNETMASK_IN6: 560 ifr->ifr_addr = ia->ia_prefixmask; 561 break; 562 563 case SIOCGIFAFLAG_IN6: 564 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 565 break; 566 567 case SIOCGIFSTAT_IN6: 568 if (ifp == NULL) { 569 error = EINVAL; 570 goto out; 571 } 572 bzero(&ifr->ifr_ifru.ifru_stat, 573 sizeof(ifr->ifr_ifru.ifru_stat)); 574 ifr->ifr_ifru.ifru_stat = 575 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat; 576 break; 577 578 case SIOCGIFSTAT_ICMP6: 579 if (ifp == NULL) { 580 error = EINVAL; 581 goto out; 582 } 583 bzero(&ifr->ifr_ifru.ifru_icmp6stat, 584 sizeof(ifr->ifr_ifru.ifru_icmp6stat)); 585 ifr->ifr_ifru.ifru_icmp6stat = 586 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat; 587 break; 588 589 case SIOCGIFALIFETIME_IN6: 590 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 591 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 592 time_t maxexpire; 593 struct in6_addrlifetime *retlt = 594 &ifr->ifr_ifru.ifru_lifetime; 595 596 /* 597 * XXX: adjust expiration time assuming time_t is 598 * signed. 599 */ 600 maxexpire = (-1) & 601 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 602 if (ia->ia6_lifetime.ia6t_vltime < 603 maxexpire - ia->ia6_updatetime) { 604 retlt->ia6t_expire = ia->ia6_updatetime + 605 ia->ia6_lifetime.ia6t_vltime; 606 } else 607 retlt->ia6t_expire = maxexpire; 608 } 609 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 610 time_t maxexpire; 611 struct in6_addrlifetime *retlt = 612 &ifr->ifr_ifru.ifru_lifetime; 613 614 /* 615 * XXX: adjust expiration time assuming time_t is 616 * signed. 617 */ 618 maxexpire = (-1) & 619 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 620 if (ia->ia6_lifetime.ia6t_pltime < 621 maxexpire - ia->ia6_updatetime) { 622 retlt->ia6t_preferred = ia->ia6_updatetime + 623 ia->ia6_lifetime.ia6t_pltime; 624 } else 625 retlt->ia6t_preferred = maxexpire; 626 } 627 break; 628 629 case SIOCSIFALIFETIME_IN6: 630 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; 631 /* for sanity */ 632 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 633 ia->ia6_lifetime.ia6t_expire = 634 time_second + ia->ia6_lifetime.ia6t_vltime; 635 } else 636 ia->ia6_lifetime.ia6t_expire = 0; 637 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 638 ia->ia6_lifetime.ia6t_preferred = 639 time_second + ia->ia6_lifetime.ia6t_pltime; 640 } else 641 ia->ia6_lifetime.ia6t_preferred = 0; 642 break; 643 644 case SIOCAIFADDR_IN6: 645 { 646 int i; 647 struct nd_prefixctl pr0; 648 struct nd_prefix *pr; 649 650 /* 651 * first, make or update the interface address structure, 652 * and link it to the list. 653 */ 654 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 655 goto out; 656 if (ia != NULL) 657 ifa_free(&ia->ia_ifa); 658 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 659 == NULL) { 660 /* 661 * this can happen when the user specify the 0 valid 662 * lifetime. 663 */ 664 break; 665 } 666 667 if (cmd == ocmd && ifra->ifra_vhid > 0) { 668 if (carp_attach_p != NULL) 669 error = (*carp_attach_p)(&ia->ia_ifa, 670 ifra->ifra_vhid); 671 else 672 error = EPROTONOSUPPORT; 673 if (error) 674 goto out; 675 else 676 carp_attached = 1; 677 } 678 679 /* 680 * then, make the prefix on-link on the interface. 681 * XXX: we'd rather create the prefix before the address, but 682 * we need at least one address to install the corresponding 683 * interface route, so we configure the address first. 684 */ 685 686 /* 687 * convert mask to prefix length (prefixmask has already 688 * been validated in in6_update_ifa(). 689 */ 690 bzero(&pr0, sizeof(pr0)); 691 pr0.ndpr_ifp = ifp; 692 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 693 NULL); 694 if (pr0.ndpr_plen == 128) { 695 break; /* we don't need to install a host route. */ 696 } 697 pr0.ndpr_prefix = ifra->ifra_addr; 698 /* apply the mask for safety. */ 699 for (i = 0; i < 4; i++) { 700 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 701 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i]; 702 } 703 /* 704 * XXX: since we don't have an API to set prefix (not address) 705 * lifetimes, we just use the same lifetimes as addresses. 706 * The (temporarily) installed lifetimes can be overridden by 707 * later advertised RAs (when accept_rtadv is non 0), which is 708 * an intended behavior. 709 */ 710 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 711 pr0.ndpr_raf_auto = 712 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 713 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 714 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 715 716 /* add the prefix if not yet. */ 717 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 718 /* 719 * nd6_prelist_add will install the corresponding 720 * interface route. 721 */ 722 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) { 723 if (carp_attached) 724 (*carp_detach_p)(&ia->ia_ifa); 725 goto out; 726 } 727 if (pr == NULL) { 728 if (carp_attached) 729 (*carp_detach_p)(&ia->ia_ifa); 730 log(LOG_ERR, "nd6_prelist_add succeeded but " 731 "no prefix\n"); 732 error = EINVAL; 733 goto out; 734 } 735 } 736 737 /* relate the address to the prefix */ 738 if (ia->ia6_ndpr == NULL) { 739 ia->ia6_ndpr = pr; 740 pr->ndpr_refcnt++; 741 742 /* 743 * If this is the first autoconf address from the 744 * prefix, create a temporary address as well 745 * (when required). 746 */ 747 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 748 V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) { 749 int e; 750 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 751 log(LOG_NOTICE, "in6_control: failed " 752 "to create a temporary address, " 753 "errno=%d\n", e); 754 } 755 } 756 } 757 758 /* 759 * this might affect the status of autoconfigured addresses, 760 * that is, this address might make other addresses detached. 761 */ 762 pfxlist_onlink_check(); 763 if (error == 0 && ia) { 764 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) { 765 /* 766 * Try to clear the flag when a new 767 * IPv6 address is added onto an 768 * IFDISABLED interface and it 769 * succeeds. 770 */ 771 struct in6_ndireq nd; 772 773 memset(&nd, 0, sizeof(nd)); 774 nd.ndi.flags = ND_IFINFO(ifp)->flags; 775 nd.ndi.flags &= ~ND6_IFF_IFDISABLED; 776 if (nd6_ioctl(SIOCSIFINFO_FLAGS, 777 (caddr_t)&nd, ifp) < 0) 778 log(LOG_NOTICE, "SIOCAIFADDR_IN6: " 779 "SIOCSIFINFO_FLAGS for -ifdisabled " 780 "failed."); 781 /* 782 * Ignore failure of clearing the flag 783 * intentionally. The failure means 784 * address duplication was detected. 785 */ 786 } 787 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 788 } 789 break; 790 } 791 792 case SIOCDIFADDR_IN6: 793 { 794 struct nd_prefix *pr; 795 796 /* 797 * If the address being deleted is the only one that owns 798 * the corresponding prefix, expire the prefix as well. 799 * XXX: theoretically, we don't have to worry about such 800 * relationship, since we separate the address management 801 * and the prefix management. We do this, however, to provide 802 * as much backward compatibility as possible in terms of 803 * the ioctl operation. 804 * Note that in6_purgeaddr() will decrement ndpr_refcnt. 805 */ 806 pr = ia->ia6_ndpr; 807 in6_purgeaddr(&ia->ia_ifa); 808 if (pr && pr->ndpr_refcnt == 0) 809 prelist_remove(pr); 810 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 811 break; 812 } 813 814 default: 815 if (ifp == NULL || ifp->if_ioctl == 0) { 816 error = EOPNOTSUPP; 817 goto out; 818 } 819 error = (*ifp->if_ioctl)(ifp, cmd, data); 820 goto out; 821 } 822 823 error = 0; 824 out: 825 if (ia != NULL) 826 ifa_free(&ia->ia_ifa); 827 return (error); 828 } 829 830 831 /* 832 * Join necessary multicast groups. Factored out from in6_update_ifa(). 833 * This entire work should only be done once, for the default FIB. 834 */ 835 static int 836 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra, 837 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol) 838 { 839 char ip6buf[INET6_ADDRSTRLEN]; 840 struct sockaddr_in6 mltaddr, mltmask; 841 struct in6_addr llsol; 842 struct in6_multi_mship *imm; 843 struct rtentry *rt; 844 int delay, error; 845 846 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__)); 847 848 /* Join solicited multicast addr for new host id. */ 849 bzero(&llsol, sizeof(struct in6_addr)); 850 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL; 851 llsol.s6_addr32[1] = 0; 852 llsol.s6_addr32[2] = htonl(1); 853 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 854 llsol.s6_addr8[12] = 0xff; 855 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) { 856 /* XXX: should not happen */ 857 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 858 goto cleanup; 859 } 860 delay = 0; 861 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 862 /* 863 * We need a random delay for DAD on the address being 864 * configured. It also means delaying transmission of the 865 * corresponding MLD report to avoid report collision. 866 * [RFC 4861, Section 6.3.7] 867 */ 868 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 869 } 870 imm = in6_joingroup(ifp, &llsol, &error, delay); 871 if (imm == NULL) { 872 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 873 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &llsol), 874 if_name(ifp), error)); 875 goto cleanup; 876 } 877 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 878 *in6m_sol = imm->i6mm_maddr; 879 880 bzero(&mltmask, sizeof(mltmask)); 881 mltmask.sin6_len = sizeof(struct sockaddr_in6); 882 mltmask.sin6_family = AF_INET6; 883 mltmask.sin6_addr = in6mask32; 884 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */ 885 886 /* 887 * Join link-local all-nodes address. 888 */ 889 bzero(&mltaddr, sizeof(mltaddr)); 890 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 891 mltaddr.sin6_family = AF_INET6; 892 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 893 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 894 goto cleanup; /* XXX: should not fail */ 895 896 /* 897 * XXX: do we really need this automatic routes? We should probably 898 * reconsider this stuff. Most applications actually do not need the 899 * routes, since they usually specify the outgoing interface. 900 */ 901 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 902 if (rt != NULL) { 903 /* XXX: only works in !SCOPEDROUTING case. */ 904 if (memcmp(&mltaddr.sin6_addr, 905 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, 906 MLTMASK_LEN)) { 907 RTFREE_LOCKED(rt); 908 rt = NULL; 909 } 910 } 911 if (rt == NULL) { 912 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr, 913 (struct sockaddr *)&ia->ia_addr, 914 (struct sockaddr *)&mltmask, RTF_UP, 915 (struct rtentry **)0, RT_DEFAULT_FIB); 916 if (error) 917 goto cleanup; 918 } else 919 RTFREE_LOCKED(rt); 920 921 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 922 if (imm == NULL) { 923 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 924 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 925 &mltaddr.sin6_addr), if_name(ifp), error)); 926 goto cleanup; 927 } 928 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 929 930 /* 931 * Join node information group address. 932 */ 933 delay = 0; 934 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 935 /* 936 * The spec does not say anything about delay for this group, 937 * but the same logic should apply. 938 */ 939 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 940 } 941 if (in6_nigroup(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) { 942 /* XXX jinmei */ 943 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, delay); 944 if (imm == NULL) 945 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 946 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 947 &mltaddr.sin6_addr), if_name(ifp), error)); 948 /* XXX not very fatal, go on... */ 949 else 950 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 951 } 952 953 /* 954 * Join interface-local all-nodes address. 955 * (ff01::1%ifN, and ff01::%ifN/32) 956 */ 957 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 958 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 959 goto cleanup; /* XXX: should not fail */ 960 /* XXX: again, do we really need the route? */ 961 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 962 if (rt != NULL) { 963 if (memcmp(&mltaddr.sin6_addr, 964 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, 965 MLTMASK_LEN)) { 966 RTFREE_LOCKED(rt); 967 rt = NULL; 968 } 969 } 970 if (rt == NULL) { 971 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr, 972 (struct sockaddr *)&ia->ia_addr, 973 (struct sockaddr *)&mltmask, RTF_UP, 974 (struct rtentry **)0, RT_DEFAULT_FIB); 975 if (error) 976 goto cleanup; 977 } else 978 RTFREE_LOCKED(rt); 979 980 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 981 if (imm == NULL) { 982 nd6log((LOG_WARNING, "%s: addmulti failed for %s on %s " 983 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 984 &mltaddr.sin6_addr), if_name(ifp), error)); 985 goto cleanup; 986 } 987 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 988 #undef MLTMASK_LEN 989 990 cleanup: 991 return (error); 992 } 993 994 /* 995 * Update parameters of an IPv6 interface address. 996 * If necessary, a new entry is created and linked into address chains. 997 * This function is separated from in6_control(). 998 */ 999 int 1000 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1001 struct in6_ifaddr *ia, int flags) 1002 { 1003 int error = 0, hostIsNew = 0, plen = -1; 1004 struct sockaddr_in6 dst6; 1005 struct in6_addrlifetime *lt; 1006 struct in6_multi *in6m_sol; 1007 int delay; 1008 char ip6buf[INET6_ADDRSTRLEN]; 1009 1010 /* Validate parameters */ 1011 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 1012 return (EINVAL); 1013 1014 /* 1015 * The destination address for a p2p link must have a family 1016 * of AF_UNSPEC or AF_INET6. 1017 */ 1018 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 1019 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 1020 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 1021 return (EAFNOSUPPORT); 1022 /* 1023 * validate ifra_prefixmask. don't check sin6_family, netmask 1024 * does not carry fields other than sin6_len. 1025 */ 1026 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 1027 return (EINVAL); 1028 /* 1029 * Because the IPv6 address architecture is classless, we require 1030 * users to specify a (non 0) prefix length (mask) for a new address. 1031 * We also require the prefix (when specified) mask is valid, and thus 1032 * reject a non-consecutive mask. 1033 */ 1034 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 1035 return (EINVAL); 1036 if (ifra->ifra_prefixmask.sin6_len != 0) { 1037 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 1038 (u_char *)&ifra->ifra_prefixmask + 1039 ifra->ifra_prefixmask.sin6_len); 1040 if (plen <= 0) 1041 return (EINVAL); 1042 } else { 1043 /* 1044 * In this case, ia must not be NULL. We just use its prefix 1045 * length. 1046 */ 1047 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1048 } 1049 /* 1050 * If the destination address on a p2p interface is specified, 1051 * and the address is a scoped one, validate/set the scope 1052 * zone identifier. 1053 */ 1054 dst6 = ifra->ifra_dstaddr; 1055 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 1056 (dst6.sin6_family == AF_INET6)) { 1057 struct in6_addr in6_tmp; 1058 u_int32_t zoneid; 1059 1060 in6_tmp = dst6.sin6_addr; 1061 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 1062 return (EINVAL); /* XXX: should be impossible */ 1063 1064 if (dst6.sin6_scope_id != 0) { 1065 if (dst6.sin6_scope_id != zoneid) 1066 return (EINVAL); 1067 } else /* user omit to specify the ID. */ 1068 dst6.sin6_scope_id = zoneid; 1069 1070 /* convert into the internal form */ 1071 if (sa6_embedscope(&dst6, 0)) 1072 return (EINVAL); /* XXX: should be impossible */ 1073 } 1074 /* 1075 * The destination address can be specified only for a p2p or a 1076 * loopback interface. If specified, the corresponding prefix length 1077 * must be 128. 1078 */ 1079 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 1080 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 1081 /* XXX: noisy message */ 1082 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 1083 "be specified for a p2p or a loopback IF only\n")); 1084 return (EINVAL); 1085 } 1086 if (plen != 128) { 1087 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 1088 "be 128 when dstaddr is specified\n")); 1089 return (EINVAL); 1090 } 1091 } 1092 /* lifetime consistency check */ 1093 lt = &ifra->ifra_lifetime; 1094 if (lt->ia6t_pltime > lt->ia6t_vltime) 1095 return (EINVAL); 1096 if (lt->ia6t_vltime == 0) { 1097 /* 1098 * the following log might be noisy, but this is a typical 1099 * configuration mistake or a tool's bug. 1100 */ 1101 nd6log((LOG_INFO, 1102 "in6_update_ifa: valid lifetime is 0 for %s\n", 1103 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr))); 1104 1105 if (ia == NULL) 1106 return (0); /* there's nothing to do */ 1107 } 1108 1109 /* 1110 * If this is a new address, allocate a new ifaddr and link it 1111 * into chains. 1112 */ 1113 if (ia == NULL) { 1114 hostIsNew = 1; 1115 /* 1116 * When in6_update_ifa() is called in a process of a received 1117 * RA, it is called under an interrupt context. So, we should 1118 * call malloc with M_NOWAIT. 1119 */ 1120 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR, 1121 M_NOWAIT); 1122 if (ia == NULL) 1123 return (ENOBUFS); 1124 bzero((caddr_t)ia, sizeof(*ia)); 1125 ifa_init(&ia->ia_ifa); 1126 LIST_INIT(&ia->ia6_memberships); 1127 /* Initialize the address and masks, and put time stamp */ 1128 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1129 ia->ia_addr.sin6_family = AF_INET6; 1130 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 1131 ia->ia6_createtime = time_second; 1132 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1133 /* 1134 * XXX: some functions expect that ifa_dstaddr is not 1135 * NULL for p2p interfaces. 1136 */ 1137 ia->ia_ifa.ifa_dstaddr = 1138 (struct sockaddr *)&ia->ia_dstaddr; 1139 } else { 1140 ia->ia_ifa.ifa_dstaddr = NULL; 1141 } 1142 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 1143 ia->ia_ifp = ifp; 1144 ifa_ref(&ia->ia_ifa); /* if_addrhead */ 1145 IF_ADDR_WLOCK(ifp); 1146 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1147 IF_ADDR_WUNLOCK(ifp); 1148 1149 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */ 1150 IN6_IFADDR_WLOCK(); 1151 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link); 1152 IN6_IFADDR_WUNLOCK(); 1153 } 1154 1155 /* update timestamp */ 1156 ia->ia6_updatetime = time_second; 1157 1158 /* set prefix mask */ 1159 if (ifra->ifra_prefixmask.sin6_len) { 1160 /* 1161 * We prohibit changing the prefix length of an existing 1162 * address, because 1163 * + such an operation should be rare in IPv6, and 1164 * + the operation would confuse prefix management. 1165 */ 1166 if (ia->ia_prefixmask.sin6_len && 1167 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 1168 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an" 1169 " existing (%s) address should not be changed\n", 1170 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1171 error = EINVAL; 1172 goto unlink; 1173 } 1174 ia->ia_prefixmask = ifra->ifra_prefixmask; 1175 } 1176 1177 /* 1178 * If a new destination address is specified, scrub the old one and 1179 * install the new destination. Note that the interface must be 1180 * p2p or loopback (see the check above.) 1181 */ 1182 if (dst6.sin6_family == AF_INET6 && 1183 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1184 int e; 1185 1186 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1187 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) { 1188 nd6log((LOG_ERR, "in6_update_ifa: failed to remove " 1189 "a route to the old destination: %s\n", 1190 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1191 /* proceed anyway... */ 1192 } else 1193 ia->ia_flags &= ~IFA_ROUTE; 1194 ia->ia_dstaddr = dst6; 1195 } 1196 1197 /* 1198 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1199 * to see if the address is deprecated or invalidated, but initialize 1200 * these members for applications. 1201 */ 1202 ia->ia6_lifetime = ifra->ifra_lifetime; 1203 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1204 ia->ia6_lifetime.ia6t_expire = 1205 time_second + ia->ia6_lifetime.ia6t_vltime; 1206 } else 1207 ia->ia6_lifetime.ia6t_expire = 0; 1208 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1209 ia->ia6_lifetime.ia6t_preferred = 1210 time_second + ia->ia6_lifetime.ia6t_pltime; 1211 } else 1212 ia->ia6_lifetime.ia6t_preferred = 0; 1213 1214 /* reset the interface and routing table appropriately. */ 1215 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 1216 goto unlink; 1217 1218 /* 1219 * configure address flags. 1220 */ 1221 ia->ia6_flags = ifra->ifra_flags; 1222 /* 1223 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1224 * userland, make it deprecated. 1225 */ 1226 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1227 ia->ia6_lifetime.ia6t_pltime = 0; 1228 ia->ia6_lifetime.ia6t_preferred = time_second; 1229 } 1230 /* 1231 * Make the address tentative before joining multicast addresses, 1232 * so that corresponding MLD responses would not have a tentative 1233 * source address. 1234 */ 1235 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1236 if (hostIsNew && in6if_do_dad(ifp)) 1237 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1238 1239 /* DAD should be performed after ND6_IFF_IFDISABLED is cleared. */ 1240 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1241 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1242 1243 /* 1244 * We are done if we have simply modified an existing address. 1245 */ 1246 if (!hostIsNew) 1247 return (error); 1248 1249 /* 1250 * Beyond this point, we should call in6_purgeaddr upon an error, 1251 * not just go to unlink. 1252 */ 1253 1254 /* Join necessary multicast groups. */ 1255 in6m_sol = NULL; 1256 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1257 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol); 1258 if (error) 1259 goto cleanup; 1260 } 1261 1262 /* 1263 * Perform DAD, if needed. 1264 * XXX It may be of use, if we can administratively disable DAD. 1265 */ 1266 if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && 1267 (ia->ia6_flags & IN6_IFF_TENTATIVE)) 1268 { 1269 int mindelay, maxdelay; 1270 1271 delay = 0; 1272 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1273 /* 1274 * We need to impose a delay before sending an NS 1275 * for DAD. Check if we also needed a delay for the 1276 * corresponding MLD message. If we did, the delay 1277 * should be larger than the MLD delay (this could be 1278 * relaxed a bit, but this simple logic is at least 1279 * safe). 1280 * XXX: Break data hiding guidelines and look at 1281 * state for the solicited multicast group. 1282 */ 1283 mindelay = 0; 1284 if (in6m_sol != NULL && 1285 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) { 1286 mindelay = in6m_sol->in6m_timer; 1287 } 1288 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1289 if (maxdelay - mindelay == 0) 1290 delay = 0; 1291 else { 1292 delay = 1293 (arc4random() % (maxdelay - mindelay)) + 1294 mindelay; 1295 } 1296 } 1297 nd6_dad_start((struct ifaddr *)ia, delay); 1298 } 1299 1300 KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew")); 1301 ifa_free(&ia->ia_ifa); 1302 return (error); 1303 1304 unlink: 1305 /* 1306 * XXX: if a change of an existing address failed, keep the entry 1307 * anyway. 1308 */ 1309 if (hostIsNew) { 1310 in6_unlink_ifa(ia, ifp); 1311 ifa_free(&ia->ia_ifa); 1312 } 1313 return (error); 1314 1315 cleanup: 1316 KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew")); 1317 ifa_free(&ia->ia_ifa); 1318 in6_purgeaddr(&ia->ia_ifa); 1319 return error; 1320 } 1321 1322 /* 1323 * Leave multicast groups. Factored out from in6_purgeaddr(). 1324 * This entire work should only be done once, for the default FIB. 1325 */ 1326 static int 1327 in6_purgeaddr_mc(struct ifnet *ifp, struct in6_ifaddr *ia, struct ifaddr *ifa0) 1328 { 1329 struct sockaddr_in6 mltaddr, mltmask; 1330 struct in6_multi_mship *imm; 1331 struct rtentry *rt; 1332 struct sockaddr_in6 sin6; 1333 int error; 1334 1335 /* 1336 * Leave from multicast groups we have joined for the interface. 1337 */ 1338 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1339 LIST_REMOVE(imm, i6mm_chain); 1340 in6_leavegroup(imm); 1341 } 1342 1343 /* 1344 * Remove the link-local all-nodes address. 1345 */ 1346 bzero(&mltmask, sizeof(mltmask)); 1347 mltmask.sin6_len = sizeof(struct sockaddr_in6); 1348 mltmask.sin6_family = AF_INET6; 1349 mltmask.sin6_addr = in6mask32; 1350 1351 bzero(&mltaddr, sizeof(mltaddr)); 1352 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 1353 mltaddr.sin6_family = AF_INET6; 1354 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 1355 1356 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1357 return (error); 1358 1359 /* 1360 * As for the mltaddr above, proactively prepare the sin6 to avoid 1361 * rtentry un- and re-locking. 1362 */ 1363 if (ifa0 != NULL) { 1364 bzero(&sin6, sizeof(sin6)); 1365 sin6.sin6_len = sizeof(sin6); 1366 sin6.sin6_family = AF_INET6; 1367 memcpy(&sin6.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, 1368 sizeof(sin6.sin6_addr)); 1369 error = in6_setscope(&sin6.sin6_addr, ifa0->ifa_ifp, NULL); 1370 if (error != 0) 1371 return (error); 1372 } 1373 1374 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 1375 if (rt != NULL && rt->rt_gateway != NULL && 1376 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 1377 &ia->ia_addr.sin6_addr, 1378 sizeof(ia->ia_addr.sin6_addr)) == 0)) { 1379 /* 1380 * If no more IPv6 address exists on this interface then 1381 * remove the multicast address route. 1382 */ 1383 if (ifa0 == NULL) { 1384 memcpy(&mltaddr.sin6_addr, 1385 &satosin6(rt_key(rt))->sin6_addr, 1386 sizeof(mltaddr.sin6_addr)); 1387 RTFREE_LOCKED(rt); 1388 error = in6_rtrequest(RTM_DELETE, 1389 (struct sockaddr *)&mltaddr, 1390 (struct sockaddr *)&ia->ia_addr, 1391 (struct sockaddr *)&mltmask, RTF_UP, 1392 (struct rtentry **)0, RT_DEFAULT_FIB); 1393 if (error) 1394 log(LOG_INFO, "%s: link-local all-nodes " 1395 "multicast address deletion error\n", 1396 __func__); 1397 } else { 1398 /* 1399 * Replace the gateway of the route. 1400 */ 1401 memcpy(rt->rt_gateway, &sin6, sizeof(sin6)); 1402 RTFREE_LOCKED(rt); 1403 } 1404 } else { 1405 if (rt != NULL) 1406 RTFREE_LOCKED(rt); 1407 } 1408 1409 /* 1410 * Remove the node-local all-nodes address. 1411 */ 1412 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1413 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1414 return (error); 1415 1416 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 1417 if (rt != NULL && rt->rt_gateway != NULL && 1418 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 1419 &ia->ia_addr.sin6_addr, 1420 sizeof(ia->ia_addr.sin6_addr)) == 0)) { 1421 /* 1422 * If no more IPv6 address exists on this interface then 1423 * remove the multicast address route. 1424 */ 1425 if (ifa0 == NULL) { 1426 memcpy(&mltaddr.sin6_addr, 1427 &satosin6(rt_key(rt))->sin6_addr, 1428 sizeof(mltaddr.sin6_addr)); 1429 1430 RTFREE_LOCKED(rt); 1431 error = in6_rtrequest(RTM_DELETE, 1432 (struct sockaddr *)&mltaddr, 1433 (struct sockaddr *)&ia->ia_addr, 1434 (struct sockaddr *)&mltmask, RTF_UP, 1435 (struct rtentry **)0, RT_DEFAULT_FIB); 1436 if (error) 1437 log(LOG_INFO, "%s: node-local all-nodes" 1438 "multicast address deletion error\n", 1439 __func__); 1440 } else { 1441 /* 1442 * Replace the gateway of the route. 1443 */ 1444 memcpy(rt->rt_gateway, &sin6, sizeof(sin6)); 1445 RTFREE_LOCKED(rt); 1446 } 1447 } else { 1448 if (rt != NULL) 1449 RTFREE_LOCKED(rt); 1450 } 1451 1452 return (0); 1453 } 1454 1455 void 1456 in6_purgeaddr(struct ifaddr *ifa) 1457 { 1458 struct ifnet *ifp = ifa->ifa_ifp; 1459 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1460 int plen, error; 1461 struct ifaddr *ifa0; 1462 1463 if (ifa->ifa_carp) 1464 (*carp_detach_p)(ifa); 1465 1466 /* 1467 * find another IPv6 address as the gateway for the 1468 * link-local and node-local all-nodes multicast 1469 * address routes 1470 */ 1471 IF_ADDR_RLOCK(ifp); 1472 TAILQ_FOREACH(ifa0, &ifp->if_addrhead, ifa_link) { 1473 if ((ifa0->ifa_addr->sa_family != AF_INET6) || 1474 memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr, 1475 &ia->ia_addr.sin6_addr, sizeof(struct in6_addr)) == 0) 1476 continue; 1477 else 1478 break; 1479 } 1480 if (ifa0 != NULL) 1481 ifa_ref(ifa0); 1482 IF_ADDR_RUNLOCK(ifp); 1483 1484 /* 1485 * Remove the loopback route to the interface address. 1486 * The check for the current setting of "nd6_useloopback" 1487 * is not needed. 1488 */ 1489 if (ia->ia_flags & IFA_RTSELF) { 1490 error = ifa_del_loopback_route((struct ifaddr *)ia, 1491 (struct sockaddr *)&ia->ia_addr); 1492 if (error == 0) 1493 ia->ia_flags &= ~IFA_RTSELF; 1494 } 1495 1496 /* stop DAD processing */ 1497 nd6_dad_stop(ifa); 1498 1499 /* Remove local address entry from lltable. */ 1500 in6_ifremloop(ifa); 1501 1502 /* Leave multicast groups. */ 1503 error = in6_purgeaddr_mc(ifp, ia, ifa0); 1504 1505 if (ifa0 != NULL) 1506 ifa_free(ifa0); 1507 1508 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1509 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) { 1510 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags | 1511 (ia->ia_dstaddr.sin6_family == AF_INET6) ? RTF_HOST : 0); 1512 if (error != 0) 1513 log(LOG_INFO, "%s: err=%d, destination address delete " 1514 "failed\n", __func__, error); 1515 ia->ia_flags &= ~IFA_ROUTE; 1516 } 1517 1518 in6_unlink_ifa(ia, ifp); 1519 } 1520 1521 static void 1522 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1523 { 1524 1525 IF_ADDR_WLOCK(ifp); 1526 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1527 IF_ADDR_WUNLOCK(ifp); 1528 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1529 1530 /* 1531 * Defer the release of what might be the last reference to the 1532 * in6_ifaddr so that it can't be freed before the remainder of the 1533 * cleanup. 1534 */ 1535 IN6_IFADDR_WLOCK(); 1536 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 1537 IN6_IFADDR_WUNLOCK(); 1538 1539 /* 1540 * Release the reference to the base prefix. There should be a 1541 * positive reference. 1542 */ 1543 if (ia->ia6_ndpr == NULL) { 1544 nd6log((LOG_NOTICE, 1545 "in6_unlink_ifa: autoconf'ed address " 1546 "%p has no prefix\n", ia)); 1547 } else { 1548 ia->ia6_ndpr->ndpr_refcnt--; 1549 ia->ia6_ndpr = NULL; 1550 } 1551 1552 /* 1553 * Also, if the address being removed is autoconf'ed, call 1554 * pfxlist_onlink_check() since the release might affect the status of 1555 * other (detached) addresses. 1556 */ 1557 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1558 pfxlist_onlink_check(); 1559 } 1560 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1561 } 1562 1563 void 1564 in6_purgeif(struct ifnet *ifp) 1565 { 1566 struct ifaddr *ifa, *nifa; 1567 1568 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) { 1569 if (ifa->ifa_addr->sa_family != AF_INET6) 1570 continue; 1571 in6_purgeaddr(ifa); 1572 } 1573 1574 in6_ifdetach(ifp); 1575 } 1576 1577 /* 1578 * SIOC[GAD]LIFADDR. 1579 * SIOCGLIFADDR: get first address. (?) 1580 * SIOCGLIFADDR with IFLR_PREFIX: 1581 * get first address that matches the specified prefix. 1582 * SIOCALIFADDR: add the specified address. 1583 * SIOCALIFADDR with IFLR_PREFIX: 1584 * add the specified prefix, filling hostid part from 1585 * the first link-local address. prefixlen must be <= 64. 1586 * SIOCDLIFADDR: delete the specified address. 1587 * SIOCDLIFADDR with IFLR_PREFIX: 1588 * delete the first address that matches the specified prefix. 1589 * return values: 1590 * EINVAL on invalid parameters 1591 * EADDRNOTAVAIL on prefix match failed/specified address not found 1592 * other values may be returned from in6_ioctl() 1593 * 1594 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1595 * this is to accomodate address naming scheme other than RFC2374, 1596 * in the future. 1597 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1598 * address encoding scheme. (see figure on page 8) 1599 */ 1600 static int 1601 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 1602 struct ifnet *ifp, struct thread *td) 1603 { 1604 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1605 struct ifaddr *ifa; 1606 struct sockaddr *sa; 1607 1608 /* sanity checks */ 1609 if (!data || !ifp) { 1610 panic("invalid argument to in6_lifaddr_ioctl"); 1611 /* NOTREACHED */ 1612 } 1613 1614 switch (cmd) { 1615 case SIOCGLIFADDR: 1616 /* address must be specified on GET with IFLR_PREFIX */ 1617 if ((iflr->flags & IFLR_PREFIX) == 0) 1618 break; 1619 /* FALLTHROUGH */ 1620 case SIOCALIFADDR: 1621 case SIOCDLIFADDR: 1622 /* address must be specified on ADD and DELETE */ 1623 sa = (struct sockaddr *)&iflr->addr; 1624 if (sa->sa_family != AF_INET6) 1625 return EINVAL; 1626 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1627 return EINVAL; 1628 /* XXX need improvement */ 1629 sa = (struct sockaddr *)&iflr->dstaddr; 1630 if (sa->sa_family && sa->sa_family != AF_INET6) 1631 return EINVAL; 1632 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1633 return EINVAL; 1634 break; 1635 default: /* shouldn't happen */ 1636 #if 0 1637 panic("invalid cmd to in6_lifaddr_ioctl"); 1638 /* NOTREACHED */ 1639 #else 1640 return EOPNOTSUPP; 1641 #endif 1642 } 1643 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) 1644 return EINVAL; 1645 1646 switch (cmd) { 1647 case SIOCALIFADDR: 1648 { 1649 struct in6_aliasreq ifra; 1650 struct in6_addr *hostid = NULL; 1651 int prefixlen; 1652 1653 ifa = NULL; 1654 if ((iflr->flags & IFLR_PREFIX) != 0) { 1655 struct sockaddr_in6 *sin6; 1656 1657 /* 1658 * hostid is to fill in the hostid part of the 1659 * address. hostid points to the first link-local 1660 * address attached to the interface. 1661 */ 1662 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1663 if (!ifa) 1664 return EADDRNOTAVAIL; 1665 hostid = IFA_IN6(ifa); 1666 1667 /* prefixlen must be <= 64. */ 1668 if (64 < iflr->prefixlen) { 1669 if (ifa != NULL) 1670 ifa_free(ifa); 1671 return EINVAL; 1672 } 1673 prefixlen = iflr->prefixlen; 1674 1675 /* hostid part must be zero. */ 1676 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1677 if (sin6->sin6_addr.s6_addr32[2] != 0 || 1678 sin6->sin6_addr.s6_addr32[3] != 0) { 1679 if (ifa != NULL) 1680 ifa_free(ifa); 1681 return EINVAL; 1682 } 1683 } else 1684 prefixlen = iflr->prefixlen; 1685 1686 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1687 bzero(&ifra, sizeof(ifra)); 1688 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name)); 1689 1690 bcopy(&iflr->addr, &ifra.ifra_addr, 1691 ((struct sockaddr *)&iflr->addr)->sa_len); 1692 if (hostid) { 1693 /* fill in hostid part */ 1694 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1695 hostid->s6_addr32[2]; 1696 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1697 hostid->s6_addr32[3]; 1698 } 1699 1700 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1701 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1702 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1703 if (hostid) { 1704 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1705 hostid->s6_addr32[2]; 1706 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1707 hostid->s6_addr32[3]; 1708 } 1709 } 1710 if (ifa != NULL) 1711 ifa_free(ifa); 1712 1713 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1714 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1715 1716 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1717 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td); 1718 } 1719 case SIOCGLIFADDR: 1720 case SIOCDLIFADDR: 1721 { 1722 struct in6_ifaddr *ia; 1723 struct in6_addr mask, candidate, match; 1724 struct sockaddr_in6 *sin6; 1725 int cmp; 1726 1727 bzero(&mask, sizeof(mask)); 1728 if (iflr->flags & IFLR_PREFIX) { 1729 /* lookup a prefix rather than address. */ 1730 in6_prefixlen2mask(&mask, iflr->prefixlen); 1731 1732 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1733 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1734 match.s6_addr32[0] &= mask.s6_addr32[0]; 1735 match.s6_addr32[1] &= mask.s6_addr32[1]; 1736 match.s6_addr32[2] &= mask.s6_addr32[2]; 1737 match.s6_addr32[3] &= mask.s6_addr32[3]; 1738 1739 /* if you set extra bits, that's wrong */ 1740 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1741 return EINVAL; 1742 1743 cmp = 1; 1744 } else { 1745 if (cmd == SIOCGLIFADDR) { 1746 /* on getting an address, take the 1st match */ 1747 cmp = 0; /* XXX */ 1748 } else { 1749 /* on deleting an address, do exact match */ 1750 in6_prefixlen2mask(&mask, 128); 1751 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1752 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1753 1754 cmp = 1; 1755 } 1756 } 1757 1758 IF_ADDR_RLOCK(ifp); 1759 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1760 if (ifa->ifa_addr->sa_family != AF_INET6) 1761 continue; 1762 if (!cmp) 1763 break; 1764 1765 /* 1766 * XXX: this is adhoc, but is necessary to allow 1767 * a user to specify fe80::/64 (not /10) for a 1768 * link-local address. 1769 */ 1770 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1771 in6_clearscope(&candidate); 1772 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1773 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1774 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1775 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1776 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1777 break; 1778 } 1779 if (ifa != NULL) 1780 ifa_ref(ifa); 1781 IF_ADDR_RUNLOCK(ifp); 1782 if (!ifa) 1783 return EADDRNOTAVAIL; 1784 ia = ifa2ia6(ifa); 1785 1786 if (cmd == SIOCGLIFADDR) { 1787 int error; 1788 1789 /* fill in the if_laddrreq structure */ 1790 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1791 error = sa6_recoverscope( 1792 (struct sockaddr_in6 *)&iflr->addr); 1793 if (error != 0) { 1794 ifa_free(ifa); 1795 return (error); 1796 } 1797 1798 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1799 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1800 ia->ia_dstaddr.sin6_len); 1801 error = sa6_recoverscope( 1802 (struct sockaddr_in6 *)&iflr->dstaddr); 1803 if (error != 0) { 1804 ifa_free(ifa); 1805 return (error); 1806 } 1807 } else 1808 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1809 1810 iflr->prefixlen = 1811 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1812 1813 iflr->flags = ia->ia6_flags; /* XXX */ 1814 ifa_free(ifa); 1815 1816 return 0; 1817 } else { 1818 struct in6_aliasreq ifra; 1819 1820 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1821 bzero(&ifra, sizeof(ifra)); 1822 bcopy(iflr->iflr_name, ifra.ifra_name, 1823 sizeof(ifra.ifra_name)); 1824 1825 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1826 ia->ia_addr.sin6_len); 1827 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1828 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1829 ia->ia_dstaddr.sin6_len); 1830 } else { 1831 bzero(&ifra.ifra_dstaddr, 1832 sizeof(ifra.ifra_dstaddr)); 1833 } 1834 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1835 ia->ia_prefixmask.sin6_len); 1836 1837 ifra.ifra_flags = ia->ia6_flags; 1838 ifa_free(ifa); 1839 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, 1840 ifp, td); 1841 } 1842 } 1843 } 1844 1845 return EOPNOTSUPP; /* just for safety */ 1846 } 1847 1848 /* 1849 * Initialize an interface's IPv6 address and routing table entry. 1850 */ 1851 static int 1852 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1853 struct sockaddr_in6 *sin6, int newhost) 1854 { 1855 int error = 0, plen, ifacount = 0; 1856 struct ifaddr *ifa; 1857 1858 /* 1859 * Give the interface a chance to initialize 1860 * if this is its first address, 1861 * and to validate the address if necessary. 1862 */ 1863 IF_ADDR_RLOCK(ifp); 1864 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1865 if (ifa->ifa_addr->sa_family != AF_INET6) 1866 continue; 1867 ifacount++; 1868 } 1869 IF_ADDR_RUNLOCK(ifp); 1870 1871 ia->ia_addr = *sin6; 1872 1873 if (ifacount <= 1 && ifp->if_ioctl) { 1874 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1875 if (error) 1876 return (error); 1877 } 1878 1879 ia->ia_ifa.ifa_metric = ifp->if_metric; 1880 1881 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1882 1883 /* 1884 * Special case: 1885 * If a new destination address is specified for a point-to-point 1886 * interface, install a route to the destination as an interface 1887 * direct route. 1888 * XXX: the logic below rejects assigning multiple addresses on a p2p 1889 * interface that share the same destination. 1890 */ 1891 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1892 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 && 1893 ia->ia_dstaddr.sin6_family == AF_INET6) { 1894 int rtflags = RTF_UP | RTF_HOST; 1895 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags); 1896 if (error) 1897 return (error); 1898 ia->ia_flags |= IFA_ROUTE; 1899 /* 1900 * Handle the case for ::1 . 1901 */ 1902 if (ifp->if_flags & IFF_LOOPBACK) 1903 ia->ia_flags |= IFA_RTSELF; 1904 } 1905 1906 /* 1907 * add a loopback route to self 1908 */ 1909 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) { 1910 error = ifa_add_loopback_route((struct ifaddr *)ia, 1911 (struct sockaddr *)&ia->ia_addr); 1912 if (error == 0) 1913 ia->ia_flags |= IFA_RTSELF; 1914 } 1915 1916 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1917 if (newhost) 1918 in6_ifaddloop(&(ia->ia_ifa)); 1919 1920 return (error); 1921 } 1922 1923 /* 1924 * Find an IPv6 interface link-local address specific to an interface. 1925 * ifaddr is returned referenced. 1926 */ 1927 struct in6_ifaddr * 1928 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1929 { 1930 struct ifaddr *ifa; 1931 1932 IF_ADDR_RLOCK(ifp); 1933 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1934 if (ifa->ifa_addr->sa_family != AF_INET6) 1935 continue; 1936 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1937 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1938 ignoreflags) != 0) 1939 continue; 1940 ifa_ref(ifa); 1941 break; 1942 } 1943 } 1944 IF_ADDR_RUNLOCK(ifp); 1945 1946 return ((struct in6_ifaddr *)ifa); 1947 } 1948 1949 1950 /* 1951 * find the internet address corresponding to a given interface and address. 1952 * ifaddr is returned referenced. 1953 */ 1954 struct in6_ifaddr * 1955 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr) 1956 { 1957 struct ifaddr *ifa; 1958 1959 IF_ADDR_RLOCK(ifp); 1960 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1961 if (ifa->ifa_addr->sa_family != AF_INET6) 1962 continue; 1963 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1964 ifa_ref(ifa); 1965 break; 1966 } 1967 } 1968 IF_ADDR_RUNLOCK(ifp); 1969 1970 return ((struct in6_ifaddr *)ifa); 1971 } 1972 1973 /* 1974 * Convert IP6 address to printable (loggable) representation. Caller 1975 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 1976 */ 1977 static char digits[] = "0123456789abcdef"; 1978 char * 1979 ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 1980 { 1981 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0; 1982 char *cp; 1983 const u_int16_t *a = (const u_int16_t *)addr; 1984 const u_int8_t *d; 1985 int dcolon = 0, zero = 0; 1986 1987 cp = ip6buf; 1988 1989 for (i = 0; i < 8; i++) { 1990 if (*(a + i) == 0) { 1991 cnt++; 1992 if (cnt == 1) 1993 idx = i; 1994 } 1995 else if (maxcnt < cnt) { 1996 maxcnt = cnt; 1997 index = idx; 1998 cnt = 0; 1999 } 2000 } 2001 if (maxcnt < cnt) { 2002 maxcnt = cnt; 2003 index = idx; 2004 } 2005 2006 for (i = 0; i < 8; i++) { 2007 if (dcolon == 1) { 2008 if (*a == 0) { 2009 if (i == 7) 2010 *cp++ = ':'; 2011 a++; 2012 continue; 2013 } else 2014 dcolon = 2; 2015 } 2016 if (*a == 0) { 2017 if (dcolon == 0 && *(a + 1) == 0 && i == index) { 2018 if (i == 0) 2019 *cp++ = ':'; 2020 *cp++ = ':'; 2021 dcolon = 1; 2022 } else { 2023 *cp++ = '0'; 2024 *cp++ = ':'; 2025 } 2026 a++; 2027 continue; 2028 } 2029 d = (const u_char *)a; 2030 /* Try to eliminate leading zeros in printout like in :0001. */ 2031 zero = 1; 2032 *cp = digits[*d >> 4]; 2033 if (*cp != '0') { 2034 zero = 0; 2035 cp++; 2036 } 2037 *cp = digits[*d++ & 0xf]; 2038 if (zero == 0 || (*cp != '0')) { 2039 zero = 0; 2040 cp++; 2041 } 2042 *cp = digits[*d >> 4]; 2043 if (zero == 0 || (*cp != '0')) { 2044 zero = 0; 2045 cp++; 2046 } 2047 *cp++ = digits[*d & 0xf]; 2048 *cp++ = ':'; 2049 a++; 2050 } 2051 *--cp = '\0'; 2052 return (ip6buf); 2053 } 2054 2055 int 2056 in6_localaddr(struct in6_addr *in6) 2057 { 2058 struct in6_ifaddr *ia; 2059 2060 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 2061 return 1; 2062 2063 IN6_IFADDR_RLOCK(); 2064 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 2065 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 2066 &ia->ia_prefixmask.sin6_addr)) { 2067 IN6_IFADDR_RUNLOCK(); 2068 return 1; 2069 } 2070 } 2071 IN6_IFADDR_RUNLOCK(); 2072 2073 return (0); 2074 } 2075 2076 /* 2077 * Return 1 if an internet address is for the local host and configured 2078 * on one of its interfaces. 2079 */ 2080 int 2081 in6_localip(struct in6_addr *in6) 2082 { 2083 struct in6_ifaddr *ia; 2084 2085 IN6_IFADDR_RLOCK(); 2086 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 2087 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) { 2088 IN6_IFADDR_RUNLOCK(); 2089 return (1); 2090 } 2091 } 2092 IN6_IFADDR_RUNLOCK(); 2093 return (0); 2094 } 2095 2096 2097 int 2098 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 2099 { 2100 struct in6_ifaddr *ia; 2101 2102 IN6_IFADDR_RLOCK(); 2103 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 2104 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 2105 &sa6->sin6_addr) && 2106 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) { 2107 IN6_IFADDR_RUNLOCK(); 2108 return (1); /* true */ 2109 } 2110 2111 /* XXX: do we still have to go thru the rest of the list? */ 2112 } 2113 IN6_IFADDR_RUNLOCK(); 2114 2115 return (0); /* false */ 2116 } 2117 2118 /* 2119 * return length of part which dst and src are equal 2120 * hard coding... 2121 */ 2122 int 2123 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 2124 { 2125 int match = 0; 2126 u_char *s = (u_char *)src, *d = (u_char *)dst; 2127 u_char *lim = s + 16, r; 2128 2129 while (s < lim) 2130 if ((r = (*d++ ^ *s++)) != 0) { 2131 while (r < 128) { 2132 match++; 2133 r <<= 1; 2134 } 2135 break; 2136 } else 2137 match += 8; 2138 return match; 2139 } 2140 2141 /* XXX: to be scope conscious */ 2142 int 2143 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 2144 { 2145 int bytelen, bitlen; 2146 2147 /* sanity check */ 2148 if (0 > len || len > 128) { 2149 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 2150 len); 2151 return (0); 2152 } 2153 2154 bytelen = len / 8; 2155 bitlen = len % 8; 2156 2157 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 2158 return (0); 2159 if (bitlen != 0 && 2160 p1->s6_addr[bytelen] >> (8 - bitlen) != 2161 p2->s6_addr[bytelen] >> (8 - bitlen)) 2162 return (0); 2163 2164 return (1); 2165 } 2166 2167 void 2168 in6_prefixlen2mask(struct in6_addr *maskp, int len) 2169 { 2170 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 2171 int bytelen, bitlen, i; 2172 2173 /* sanity check */ 2174 if (0 > len || len > 128) { 2175 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 2176 len); 2177 return; 2178 } 2179 2180 bzero(maskp, sizeof(*maskp)); 2181 bytelen = len / 8; 2182 bitlen = len % 8; 2183 for (i = 0; i < bytelen; i++) 2184 maskp->s6_addr[i] = 0xff; 2185 if (bitlen) 2186 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 2187 } 2188 2189 /* 2190 * return the best address out of the same scope. if no address was 2191 * found, return the first valid address from designated IF. 2192 */ 2193 struct in6_ifaddr * 2194 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2195 { 2196 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2197 struct ifaddr *ifa; 2198 struct in6_ifaddr *besta = 0; 2199 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2200 2201 dep[0] = dep[1] = NULL; 2202 2203 /* 2204 * We first look for addresses in the same scope. 2205 * If there is one, return it. 2206 * If two or more, return one which matches the dst longest. 2207 * If none, return one of global addresses assigned other ifs. 2208 */ 2209 IF_ADDR_RLOCK(ifp); 2210 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2211 if (ifa->ifa_addr->sa_family != AF_INET6) 2212 continue; 2213 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2214 continue; /* XXX: is there any case to allow anycast? */ 2215 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2216 continue; /* don't use this interface */ 2217 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2218 continue; 2219 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2220 if (V_ip6_use_deprecated) 2221 dep[0] = (struct in6_ifaddr *)ifa; 2222 continue; 2223 } 2224 2225 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2226 /* 2227 * call in6_matchlen() as few as possible 2228 */ 2229 if (besta) { 2230 if (blen == -1) 2231 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2232 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2233 if (tlen > blen) { 2234 blen = tlen; 2235 besta = (struct in6_ifaddr *)ifa; 2236 } 2237 } else 2238 besta = (struct in6_ifaddr *)ifa; 2239 } 2240 } 2241 if (besta) { 2242 ifa_ref(&besta->ia_ifa); 2243 IF_ADDR_RUNLOCK(ifp); 2244 return (besta); 2245 } 2246 2247 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2248 if (ifa->ifa_addr->sa_family != AF_INET6) 2249 continue; 2250 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2251 continue; /* XXX: is there any case to allow anycast? */ 2252 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2253 continue; /* don't use this interface */ 2254 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2255 continue; 2256 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2257 if (V_ip6_use_deprecated) 2258 dep[1] = (struct in6_ifaddr *)ifa; 2259 continue; 2260 } 2261 2262 if (ifa != NULL) 2263 ifa_ref(ifa); 2264 IF_ADDR_RUNLOCK(ifp); 2265 return (struct in6_ifaddr *)ifa; 2266 } 2267 2268 /* use the last-resort values, that are, deprecated addresses */ 2269 if (dep[0]) { 2270 ifa_ref((struct ifaddr *)dep[0]); 2271 IF_ADDR_RUNLOCK(ifp); 2272 return dep[0]; 2273 } 2274 if (dep[1]) { 2275 ifa_ref((struct ifaddr *)dep[1]); 2276 IF_ADDR_RUNLOCK(ifp); 2277 return dep[1]; 2278 } 2279 2280 IF_ADDR_RUNLOCK(ifp); 2281 return NULL; 2282 } 2283 2284 /* 2285 * perform DAD when interface becomes IFF_UP. 2286 */ 2287 void 2288 in6_if_up(struct ifnet *ifp) 2289 { 2290 struct ifaddr *ifa; 2291 struct in6_ifaddr *ia; 2292 2293 IF_ADDR_RLOCK(ifp); 2294 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2295 if (ifa->ifa_addr->sa_family != AF_INET6) 2296 continue; 2297 ia = (struct in6_ifaddr *)ifa; 2298 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2299 /* 2300 * The TENTATIVE flag was likely set by hand 2301 * beforehand, implicitly indicating the need for DAD. 2302 * We may be able to skip the random delay in this 2303 * case, but we impose delays just in case. 2304 */ 2305 nd6_dad_start(ifa, 2306 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 2307 } 2308 } 2309 IF_ADDR_RUNLOCK(ifp); 2310 2311 /* 2312 * special cases, like 6to4, are handled in in6_ifattach 2313 */ 2314 in6_ifattach(ifp, NULL); 2315 } 2316 2317 int 2318 in6if_do_dad(struct ifnet *ifp) 2319 { 2320 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 2321 return (0); 2322 2323 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 2324 return (0); 2325 2326 switch (ifp->if_type) { 2327 #ifdef IFT_DUMMY 2328 case IFT_DUMMY: 2329 #endif 2330 case IFT_FAITH: 2331 /* 2332 * These interfaces do not have the IFF_LOOPBACK flag, 2333 * but loop packets back. We do not have to do DAD on such 2334 * interfaces. We should even omit it, because loop-backed 2335 * NS would confuse the DAD procedure. 2336 */ 2337 return (0); 2338 default: 2339 /* 2340 * Our DAD routine requires the interface up and running. 2341 * However, some interfaces can be up before the RUNNING 2342 * status. Additionaly, users may try to assign addresses 2343 * before the interface becomes up (or running). 2344 * We simply skip DAD in such a case as a work around. 2345 * XXX: we should rather mark "tentative" on such addresses, 2346 * and do DAD after the interface becomes ready. 2347 */ 2348 if (!((ifp->if_flags & IFF_UP) && 2349 (ifp->if_drv_flags & IFF_DRV_RUNNING))) 2350 return (0); 2351 2352 return (1); 2353 } 2354 } 2355 2356 /* 2357 * Calculate max IPv6 MTU through all the interfaces and store it 2358 * to in6_maxmtu. 2359 */ 2360 void 2361 in6_setmaxmtu(void) 2362 { 2363 unsigned long maxmtu = 0; 2364 struct ifnet *ifp; 2365 2366 IFNET_RLOCK_NOSLEEP(); 2367 TAILQ_FOREACH(ifp, &V_ifnet, if_list) { 2368 /* this function can be called during ifnet initialization */ 2369 if (!ifp->if_afdata[AF_INET6]) 2370 continue; 2371 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2372 IN6_LINKMTU(ifp) > maxmtu) 2373 maxmtu = IN6_LINKMTU(ifp); 2374 } 2375 IFNET_RUNLOCK_NOSLEEP(); 2376 if (maxmtu) /* update only when maxmtu is positive */ 2377 V_in6_maxmtu = maxmtu; 2378 } 2379 2380 /* 2381 * Provide the length of interface identifiers to be used for the link attached 2382 * to the given interface. The length should be defined in "IPv6 over 2383 * xxx-link" document. Note that address architecture might also define 2384 * the length for a particular set of address prefixes, regardless of the 2385 * link type. As clarified in rfc2462bis, those two definitions should be 2386 * consistent, and those really are as of August 2004. 2387 */ 2388 int 2389 in6_if2idlen(struct ifnet *ifp) 2390 { 2391 switch (ifp->if_type) { 2392 case IFT_ETHER: /* RFC2464 */ 2393 #ifdef IFT_PROPVIRTUAL 2394 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2395 #endif 2396 #ifdef IFT_L2VLAN 2397 case IFT_L2VLAN: /* ditto */ 2398 #endif 2399 #ifdef IFT_IEEE80211 2400 case IFT_IEEE80211: /* ditto */ 2401 #endif 2402 #ifdef IFT_MIP 2403 case IFT_MIP: /* ditto */ 2404 #endif 2405 case IFT_INFINIBAND: 2406 return (64); 2407 case IFT_FDDI: /* RFC2467 */ 2408 return (64); 2409 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 2410 return (64); 2411 case IFT_PPP: /* RFC2472 */ 2412 return (64); 2413 case IFT_ARCNET: /* RFC2497 */ 2414 return (64); 2415 case IFT_FRELAY: /* RFC2590 */ 2416 return (64); 2417 case IFT_IEEE1394: /* RFC3146 */ 2418 return (64); 2419 case IFT_GIF: 2420 return (64); /* draft-ietf-v6ops-mech-v2-07 */ 2421 case IFT_LOOP: 2422 return (64); /* XXX: is this really correct? */ 2423 default: 2424 /* 2425 * Unknown link type: 2426 * It might be controversial to use the today's common constant 2427 * of 64 for these cases unconditionally. For full compliance, 2428 * we should return an error in this case. On the other hand, 2429 * if we simply miss the standard for the link type or a new 2430 * standard is defined for a new link type, the IFID length 2431 * is very likely to be the common constant. As a compromise, 2432 * we always use the constant, but make an explicit notice 2433 * indicating the "unknown" case. 2434 */ 2435 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2436 return (64); 2437 } 2438 } 2439 2440 #include <sys/sysctl.h> 2441 2442 struct in6_llentry { 2443 struct llentry base; 2444 struct sockaddr_in6 l3_addr6; 2445 }; 2446 2447 /* 2448 * Deletes an address from the address table. 2449 * This function is called by the timer functions 2450 * such as arptimer() and nd6_llinfo_timer(), and 2451 * the caller does the locking. 2452 */ 2453 static void 2454 in6_lltable_free(struct lltable *llt, struct llentry *lle) 2455 { 2456 LLE_WUNLOCK(lle); 2457 LLE_LOCK_DESTROY(lle); 2458 free(lle, M_LLTABLE); 2459 } 2460 2461 static struct llentry * 2462 in6_lltable_new(const struct sockaddr *l3addr, u_int flags) 2463 { 2464 struct in6_llentry *lle; 2465 2466 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 2467 if (lle == NULL) /* NB: caller generates msg */ 2468 return NULL; 2469 2470 lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr; 2471 lle->base.lle_refcnt = 1; 2472 lle->base.lle_free = in6_lltable_free; 2473 LLE_LOCK_INIT(&lle->base); 2474 callout_init_rw(&lle->base.ln_timer_ch, &lle->base.lle_lock, 2475 CALLOUT_RETURNUNLOCKED); 2476 2477 return (&lle->base); 2478 } 2479 2480 static void 2481 in6_lltable_prefix_free(struct lltable *llt, const struct sockaddr *prefix, 2482 const struct sockaddr *mask, u_int flags) 2483 { 2484 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix; 2485 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask; 2486 struct llentry *lle, *next; 2487 int i; 2488 2489 /* 2490 * (flags & LLE_STATIC) means deleting all entries 2491 * including static ND6 entries. 2492 */ 2493 IF_AFDATA_WLOCK(llt->llt_ifp); 2494 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 2495 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 2496 if (IN6_ARE_MASKED_ADDR_EQUAL( 2497 &satosin6(L3_ADDR(lle))->sin6_addr, 2498 &pfx->sin6_addr, &msk->sin6_addr) && 2499 ((flags & LLE_STATIC) || 2500 !(lle->la_flags & LLE_STATIC))) { 2501 LLE_WLOCK(lle); 2502 if (callout_stop(&lle->la_timer)) 2503 LLE_REMREF(lle); 2504 llentry_free(lle); 2505 } 2506 } 2507 } 2508 IF_AFDATA_WUNLOCK(llt->llt_ifp); 2509 } 2510 2511 static int 2512 in6_lltable_rtcheck(struct ifnet *ifp, 2513 u_int flags, 2514 const struct sockaddr *l3addr) 2515 { 2516 struct rtentry *rt; 2517 char ip6buf[INET6_ADDRSTRLEN]; 2518 2519 KASSERT(l3addr->sa_family == AF_INET6, 2520 ("sin_family %d", l3addr->sa_family)); 2521 2522 /* Our local addresses are always only installed on the default FIB. */ 2523 /* XXX rtalloc1 should take a const param */ 2524 rt = in6_rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0, 2525 RT_DEFAULT_FIB); 2526 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 2527 struct ifaddr *ifa; 2528 /* 2529 * Create an ND6 cache for an IPv6 neighbor 2530 * that is not covered by our own prefix. 2531 */ 2532 /* XXX ifaof_ifpforaddr should take a const param */ 2533 ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp); 2534 if (ifa != NULL) { 2535 ifa_free(ifa); 2536 if (rt != NULL) 2537 RTFREE_LOCKED(rt); 2538 return 0; 2539 } 2540 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2541 ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr)); 2542 if (rt != NULL) 2543 RTFREE_LOCKED(rt); 2544 return EINVAL; 2545 } 2546 RTFREE_LOCKED(rt); 2547 return 0; 2548 } 2549 2550 static struct llentry * 2551 in6_lltable_lookup(struct lltable *llt, u_int flags, 2552 const struct sockaddr *l3addr) 2553 { 2554 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2555 struct ifnet *ifp = llt->llt_ifp; 2556 struct llentry *lle; 2557 struct llentries *lleh; 2558 u_int hashkey; 2559 2560 IF_AFDATA_LOCK_ASSERT(ifp); 2561 KASSERT(l3addr->sa_family == AF_INET6, 2562 ("sin_family %d", l3addr->sa_family)); 2563 2564 hashkey = sin6->sin6_addr.s6_addr32[3]; 2565 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 2566 LIST_FOREACH(lle, lleh, lle_next) { 2567 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle); 2568 if (lle->la_flags & LLE_DELETED) 2569 continue; 2570 if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr, 2571 sizeof(struct in6_addr)) == 0) 2572 break; 2573 } 2574 2575 if (lle == NULL) { 2576 if (!(flags & LLE_CREATE)) 2577 return (NULL); 2578 /* 2579 * A route that covers the given address must have 2580 * been installed 1st because we are doing a resolution, 2581 * verify this. 2582 */ 2583 if (!(flags & LLE_IFADDR) && 2584 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2585 return NULL; 2586 2587 lle = in6_lltable_new(l3addr, flags); 2588 if (lle == NULL) { 2589 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2590 return NULL; 2591 } 2592 lle->la_flags = flags & ~LLE_CREATE; 2593 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 2594 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 2595 lle->la_flags |= (LLE_VALID | LLE_STATIC); 2596 } 2597 2598 lle->lle_tbl = llt; 2599 lle->lle_head = lleh; 2600 lle->la_flags |= LLE_LINKED; 2601 LIST_INSERT_HEAD(lleh, lle, lle_next); 2602 } else if (flags & LLE_DELETE) { 2603 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 2604 LLE_WLOCK(lle); 2605 lle->la_flags |= LLE_DELETED; 2606 LLE_WUNLOCK(lle); 2607 #ifdef DIAGNOSTIC 2608 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2609 #endif 2610 } 2611 lle = (void *)-1; 2612 } 2613 if (LLE_IS_VALID(lle)) { 2614 if (flags & LLE_EXCLUSIVE) 2615 LLE_WLOCK(lle); 2616 else 2617 LLE_RLOCK(lle); 2618 } 2619 return (lle); 2620 } 2621 2622 static int 2623 in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 2624 { 2625 struct ifnet *ifp = llt->llt_ifp; 2626 struct llentry *lle; 2627 /* XXX stack use */ 2628 struct { 2629 struct rt_msghdr rtm; 2630 struct sockaddr_in6 sin6; 2631 /* 2632 * ndp.c assumes that sdl is word aligned 2633 */ 2634 #ifdef __LP64__ 2635 uint32_t pad; 2636 #endif 2637 struct sockaddr_dl sdl; 2638 } ndpc; 2639 int i, error; 2640 2641 if (ifp->if_flags & IFF_LOOPBACK) 2642 return 0; 2643 2644 LLTABLE_LOCK_ASSERT(); 2645 2646 error = 0; 2647 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 2648 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 2649 struct sockaddr_dl *sdl; 2650 2651 /* skip deleted or invalid entries */ 2652 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID) 2653 continue; 2654 /* Skip if jailed and not a valid IP of the prison. */ 2655 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 2656 continue; 2657 /* 2658 * produce a msg made of: 2659 * struct rt_msghdr; 2660 * struct sockaddr_in6 (IPv6) 2661 * struct sockaddr_dl; 2662 */ 2663 bzero(&ndpc, sizeof(ndpc)); 2664 ndpc.rtm.rtm_msglen = sizeof(ndpc); 2665 ndpc.rtm.rtm_version = RTM_VERSION; 2666 ndpc.rtm.rtm_type = RTM_GET; 2667 ndpc.rtm.rtm_flags = RTF_UP; 2668 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 2669 ndpc.sin6.sin6_family = AF_INET6; 2670 ndpc.sin6.sin6_len = sizeof(ndpc.sin6); 2671 bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle)); 2672 2673 /* publish */ 2674 if (lle->la_flags & LLE_PUB) 2675 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE; 2676 2677 sdl = &ndpc.sdl; 2678 sdl->sdl_family = AF_LINK; 2679 sdl->sdl_len = sizeof(*sdl); 2680 sdl->sdl_alen = ifp->if_addrlen; 2681 sdl->sdl_index = ifp->if_index; 2682 sdl->sdl_type = ifp->if_type; 2683 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 2684 ndpc.rtm.rtm_rmx.rmx_expire = 2685 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 2686 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 2687 if (lle->la_flags & LLE_STATIC) 2688 ndpc.rtm.rtm_flags |= RTF_STATIC; 2689 ndpc.rtm.rtm_index = ifp->if_index; 2690 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc)); 2691 if (error) 2692 break; 2693 } 2694 } 2695 return error; 2696 } 2697 2698 void * 2699 in6_domifattach(struct ifnet *ifp) 2700 { 2701 struct in6_ifextra *ext; 2702 2703 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2704 bzero(ext, sizeof(*ext)); 2705 2706 ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat), 2707 M_IFADDR, M_WAITOK); 2708 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat)); 2709 2710 ext->icmp6_ifstat = 2711 (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat), 2712 M_IFADDR, M_WAITOK); 2713 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat)); 2714 2715 ext->nd_ifinfo = nd6_ifattach(ifp); 2716 ext->scope6_id = scope6_ifattach(ifp); 2717 ext->lltable = lltable_init(ifp, AF_INET6); 2718 if (ext->lltable != NULL) { 2719 ext->lltable->llt_prefix_free = in6_lltable_prefix_free; 2720 ext->lltable->llt_lookup = in6_lltable_lookup; 2721 ext->lltable->llt_dump = in6_lltable_dump; 2722 } 2723 2724 ext->mld_ifinfo = mld_domifattach(ifp); 2725 2726 return ext; 2727 } 2728 2729 void 2730 in6_domifdetach(struct ifnet *ifp, void *aux) 2731 { 2732 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2733 2734 mld_domifdetach(ifp); 2735 scope6_ifdetach(ext->scope6_id); 2736 nd6_ifdetach(ext->nd_ifinfo); 2737 lltable_free(ext->lltable); 2738 free(ext->in6_ifstat, M_IFADDR); 2739 free(ext->icmp6_ifstat, M_IFADDR); 2740 free(ext, M_IFADDR); 2741 } 2742 2743 /* 2744 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2745 * v4 mapped addr or v4 compat addr 2746 */ 2747 void 2748 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2749 { 2750 2751 bzero(sin, sizeof(*sin)); 2752 sin->sin_len = sizeof(struct sockaddr_in); 2753 sin->sin_family = AF_INET; 2754 sin->sin_port = sin6->sin6_port; 2755 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2756 } 2757 2758 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2759 void 2760 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2761 { 2762 bzero(sin6, sizeof(*sin6)); 2763 sin6->sin6_len = sizeof(struct sockaddr_in6); 2764 sin6->sin6_family = AF_INET6; 2765 sin6->sin6_port = sin->sin_port; 2766 sin6->sin6_addr.s6_addr32[0] = 0; 2767 sin6->sin6_addr.s6_addr32[1] = 0; 2768 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2769 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2770 } 2771 2772 /* Convert sockaddr_in6 into sockaddr_in. */ 2773 void 2774 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2775 { 2776 struct sockaddr_in *sin_p; 2777 struct sockaddr_in6 sin6; 2778 2779 /* 2780 * Save original sockaddr_in6 addr and convert it 2781 * to sockaddr_in. 2782 */ 2783 sin6 = *(struct sockaddr_in6 *)nam; 2784 sin_p = (struct sockaddr_in *)nam; 2785 in6_sin6_2_sin(sin_p, &sin6); 2786 } 2787 2788 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2789 void 2790 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2791 { 2792 struct sockaddr_in *sin_p; 2793 struct sockaddr_in6 *sin6_p; 2794 2795 sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK); 2796 sin_p = (struct sockaddr_in *)*nam; 2797 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2798 free(*nam, M_SONAME); 2799 *nam = (struct sockaddr *)sin6_p; 2800 } 2801