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 __P((struct socket *, u_long, caddr_t, 133 struct ifnet *, struct thread *)); 134 static int in6_ifinit __P((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 * XXX: should this be performed under splnet()? 999 */ 1000 int 1001 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1002 struct in6_ifaddr *ia, int flags) 1003 { 1004 int error = 0, hostIsNew = 0, plen = -1; 1005 struct sockaddr_in6 dst6; 1006 struct in6_addrlifetime *lt; 1007 struct in6_multi *in6m_sol; 1008 int delay; 1009 char ip6buf[INET6_ADDRSTRLEN]; 1010 1011 /* Validate parameters */ 1012 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 1013 return (EINVAL); 1014 1015 /* 1016 * The destination address for a p2p link must have a family 1017 * of AF_UNSPEC or AF_INET6. 1018 */ 1019 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 1020 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 1021 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 1022 return (EAFNOSUPPORT); 1023 /* 1024 * validate ifra_prefixmask. don't check sin6_family, netmask 1025 * does not carry fields other than sin6_len. 1026 */ 1027 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 1028 return (EINVAL); 1029 /* 1030 * Because the IPv6 address architecture is classless, we require 1031 * users to specify a (non 0) prefix length (mask) for a new address. 1032 * We also require the prefix (when specified) mask is valid, and thus 1033 * reject a non-consecutive mask. 1034 */ 1035 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 1036 return (EINVAL); 1037 if (ifra->ifra_prefixmask.sin6_len != 0) { 1038 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 1039 (u_char *)&ifra->ifra_prefixmask + 1040 ifra->ifra_prefixmask.sin6_len); 1041 if (plen <= 0) 1042 return (EINVAL); 1043 } else { 1044 /* 1045 * In this case, ia must not be NULL. We just use its prefix 1046 * length. 1047 */ 1048 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1049 } 1050 /* 1051 * If the destination address on a p2p interface is specified, 1052 * and the address is a scoped one, validate/set the scope 1053 * zone identifier. 1054 */ 1055 dst6 = ifra->ifra_dstaddr; 1056 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 1057 (dst6.sin6_family == AF_INET6)) { 1058 struct in6_addr in6_tmp; 1059 u_int32_t zoneid; 1060 1061 in6_tmp = dst6.sin6_addr; 1062 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 1063 return (EINVAL); /* XXX: should be impossible */ 1064 1065 if (dst6.sin6_scope_id != 0) { 1066 if (dst6.sin6_scope_id != zoneid) 1067 return (EINVAL); 1068 } else /* user omit to specify the ID. */ 1069 dst6.sin6_scope_id = zoneid; 1070 1071 /* convert into the internal form */ 1072 if (sa6_embedscope(&dst6, 0)) 1073 return (EINVAL); /* XXX: should be impossible */ 1074 } 1075 /* 1076 * The destination address can be specified only for a p2p or a 1077 * loopback interface. If specified, the corresponding prefix length 1078 * must be 128. 1079 */ 1080 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 1081 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 1082 /* XXX: noisy message */ 1083 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 1084 "be specified for a p2p or a loopback IF only\n")); 1085 return (EINVAL); 1086 } 1087 if (plen != 128) { 1088 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 1089 "be 128 when dstaddr is specified\n")); 1090 return (EINVAL); 1091 } 1092 } 1093 /* lifetime consistency check */ 1094 lt = &ifra->ifra_lifetime; 1095 if (lt->ia6t_pltime > lt->ia6t_vltime) 1096 return (EINVAL); 1097 if (lt->ia6t_vltime == 0) { 1098 /* 1099 * the following log might be noisy, but this is a typical 1100 * configuration mistake or a tool's bug. 1101 */ 1102 nd6log((LOG_INFO, 1103 "in6_update_ifa: valid lifetime is 0 for %s\n", 1104 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr))); 1105 1106 if (ia == NULL) 1107 return (0); /* there's nothing to do */ 1108 } 1109 1110 /* 1111 * If this is a new address, allocate a new ifaddr and link it 1112 * into chains. 1113 */ 1114 if (ia == NULL) { 1115 hostIsNew = 1; 1116 /* 1117 * When in6_update_ifa() is called in a process of a received 1118 * RA, it is called under an interrupt context. So, we should 1119 * call malloc with M_NOWAIT. 1120 */ 1121 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR, 1122 M_NOWAIT); 1123 if (ia == NULL) 1124 return (ENOBUFS); 1125 bzero((caddr_t)ia, sizeof(*ia)); 1126 ifa_init(&ia->ia_ifa); 1127 LIST_INIT(&ia->ia6_memberships); 1128 /* Initialize the address and masks, and put time stamp */ 1129 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1130 ia->ia_addr.sin6_family = AF_INET6; 1131 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 1132 ia->ia6_createtime = time_second; 1133 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1134 /* 1135 * XXX: some functions expect that ifa_dstaddr is not 1136 * NULL for p2p interfaces. 1137 */ 1138 ia->ia_ifa.ifa_dstaddr = 1139 (struct sockaddr *)&ia->ia_dstaddr; 1140 } else { 1141 ia->ia_ifa.ifa_dstaddr = NULL; 1142 } 1143 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 1144 ia->ia_ifp = ifp; 1145 ifa_ref(&ia->ia_ifa); /* if_addrhead */ 1146 IF_ADDR_WLOCK(ifp); 1147 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1148 IF_ADDR_WUNLOCK(ifp); 1149 1150 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */ 1151 IN6_IFADDR_WLOCK(); 1152 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link); 1153 IN6_IFADDR_WUNLOCK(); 1154 } 1155 1156 /* update timestamp */ 1157 ia->ia6_updatetime = time_second; 1158 1159 /* set prefix mask */ 1160 if (ifra->ifra_prefixmask.sin6_len) { 1161 /* 1162 * We prohibit changing the prefix length of an existing 1163 * address, because 1164 * + such an operation should be rare in IPv6, and 1165 * + the operation would confuse prefix management. 1166 */ 1167 if (ia->ia_prefixmask.sin6_len && 1168 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 1169 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an" 1170 " existing (%s) address should not be changed\n", 1171 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1172 error = EINVAL; 1173 goto unlink; 1174 } 1175 ia->ia_prefixmask = ifra->ifra_prefixmask; 1176 } 1177 1178 /* 1179 * If a new destination address is specified, scrub the old one and 1180 * install the new destination. Note that the interface must be 1181 * p2p or loopback (see the check above.) 1182 */ 1183 if (dst6.sin6_family == AF_INET6 && 1184 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1185 int e; 1186 1187 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1188 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) { 1189 nd6log((LOG_ERR, "in6_update_ifa: failed to remove " 1190 "a route to the old destination: %s\n", 1191 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1192 /* proceed anyway... */ 1193 } else 1194 ia->ia_flags &= ~IFA_ROUTE; 1195 ia->ia_dstaddr = dst6; 1196 } 1197 1198 /* 1199 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1200 * to see if the address is deprecated or invalidated, but initialize 1201 * these members for applications. 1202 */ 1203 ia->ia6_lifetime = ifra->ifra_lifetime; 1204 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1205 ia->ia6_lifetime.ia6t_expire = 1206 time_second + ia->ia6_lifetime.ia6t_vltime; 1207 } else 1208 ia->ia6_lifetime.ia6t_expire = 0; 1209 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1210 ia->ia6_lifetime.ia6t_preferred = 1211 time_second + ia->ia6_lifetime.ia6t_pltime; 1212 } else 1213 ia->ia6_lifetime.ia6t_preferred = 0; 1214 1215 /* reset the interface and routing table appropriately. */ 1216 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 1217 goto unlink; 1218 1219 /* 1220 * configure address flags. 1221 */ 1222 ia->ia6_flags = ifra->ifra_flags; 1223 /* 1224 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1225 * userland, make it deprecated. 1226 */ 1227 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1228 ia->ia6_lifetime.ia6t_pltime = 0; 1229 ia->ia6_lifetime.ia6t_preferred = time_second; 1230 } 1231 /* 1232 * Make the address tentative before joining multicast addresses, 1233 * so that corresponding MLD responses would not have a tentative 1234 * source address. 1235 */ 1236 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1237 if (hostIsNew && in6if_do_dad(ifp)) 1238 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1239 1240 /* DAD should be performed after ND6_IFF_IFDISABLED is cleared. */ 1241 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1242 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1243 1244 /* 1245 * We are done if we have simply modified an existing address. 1246 */ 1247 if (!hostIsNew) 1248 return (error); 1249 1250 /* 1251 * Beyond this point, we should call in6_purgeaddr upon an error, 1252 * not just go to unlink. 1253 */ 1254 1255 /* Join necessary multicast groups. */ 1256 in6m_sol = NULL; 1257 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1258 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol); 1259 if (error) 1260 goto cleanup; 1261 } 1262 1263 /* 1264 * Perform DAD, if needed. 1265 * XXX It may be of use, if we can administratively disable DAD. 1266 */ 1267 if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && 1268 (ia->ia6_flags & IN6_IFF_TENTATIVE)) 1269 { 1270 int mindelay, maxdelay; 1271 1272 delay = 0; 1273 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1274 /* 1275 * We need to impose a delay before sending an NS 1276 * for DAD. Check if we also needed a delay for the 1277 * corresponding MLD message. If we did, the delay 1278 * should be larger than the MLD delay (this could be 1279 * relaxed a bit, but this simple logic is at least 1280 * safe). 1281 * XXX: Break data hiding guidelines and look at 1282 * state for the solicited multicast group. 1283 */ 1284 mindelay = 0; 1285 if (in6m_sol != NULL && 1286 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) { 1287 mindelay = in6m_sol->in6m_timer; 1288 } 1289 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1290 if (maxdelay - mindelay == 0) 1291 delay = 0; 1292 else { 1293 delay = 1294 (arc4random() % (maxdelay - mindelay)) + 1295 mindelay; 1296 } 1297 } 1298 nd6_dad_start((struct ifaddr *)ia, delay); 1299 } 1300 1301 KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew")); 1302 ifa_free(&ia->ia_ifa); 1303 return (error); 1304 1305 unlink: 1306 /* 1307 * XXX: if a change of an existing address failed, keep the entry 1308 * anyway. 1309 */ 1310 if (hostIsNew) { 1311 in6_unlink_ifa(ia, ifp); 1312 ifa_free(&ia->ia_ifa); 1313 } 1314 return (error); 1315 1316 cleanup: 1317 KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew")); 1318 ifa_free(&ia->ia_ifa); 1319 in6_purgeaddr(&ia->ia_ifa); 1320 return error; 1321 } 1322 1323 /* 1324 * Leave multicast groups. Factored out from in6_purgeaddr(). 1325 * This entire work should only be done once, for the default FIB. 1326 */ 1327 static int 1328 in6_purgeaddr_mc(struct ifnet *ifp, struct in6_ifaddr *ia, struct ifaddr *ifa0) 1329 { 1330 struct sockaddr_in6 mltaddr, mltmask; 1331 struct in6_multi_mship *imm; 1332 struct rtentry *rt; 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 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 1360 if (rt != NULL && rt->rt_gateway != NULL && 1361 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 1362 &ia->ia_addr.sin6_addr, 1363 sizeof(ia->ia_addr.sin6_addr)) == 0)) { 1364 /* 1365 * If no more IPv6 address exists on this interface then 1366 * remove the multicast address route. 1367 */ 1368 if (ifa0 == NULL) { 1369 memcpy(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr, 1370 sizeof(mltaddr.sin6_addr)); 1371 RTFREE_LOCKED(rt); 1372 error = in6_rtrequest(RTM_DELETE, 1373 (struct sockaddr *)&mltaddr, 1374 (struct sockaddr *)&ia->ia_addr, 1375 (struct sockaddr *)&mltmask, RTF_UP, 1376 (struct rtentry **)0, RT_DEFAULT_FIB); 1377 if (error) 1378 log(LOG_INFO, "%s: link-local all-nodes " 1379 "multicast address deletion error\n", 1380 __func__); 1381 } else { 1382 /* 1383 * Replace the gateway of the route. 1384 */ 1385 struct sockaddr_in6 sa; 1386 1387 bzero(&sa, sizeof(sa)); 1388 sa.sin6_len = sizeof(struct sockaddr_in6); 1389 sa.sin6_family = AF_INET6; 1390 memcpy(&sa.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, 1391 sizeof(sa.sin6_addr)); 1392 in6_setscope(&sa.sin6_addr, ifa0->ifa_ifp, NULL); 1393 memcpy(rt->rt_gateway, &sa, sizeof(sa)); 1394 RTFREE_LOCKED(rt); 1395 } 1396 } else { 1397 if (rt != NULL) 1398 RTFREE_LOCKED(rt); 1399 } 1400 1401 /* 1402 * Remove the node-local all-nodes address. 1403 */ 1404 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1405 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1406 return (error); 1407 1408 rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); 1409 if (rt != NULL && rt->rt_gateway != NULL && 1410 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 1411 &ia->ia_addr.sin6_addr, 1412 sizeof(ia->ia_addr.sin6_addr)) == 0)) { 1413 /* 1414 * If no more IPv6 address exists on this interface then 1415 * remove the multicast address route. 1416 */ 1417 if (ifa0 == NULL) { 1418 memcpy(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr, 1419 sizeof(mltaddr.sin6_addr)); 1420 1421 RTFREE_LOCKED(rt); 1422 error = in6_rtrequest(RTM_DELETE, 1423 (struct sockaddr *)&mltaddr, 1424 (struct sockaddr *)&ia->ia_addr, 1425 (struct sockaddr *)&mltmask, RTF_UP, 1426 (struct rtentry **)0, RT_DEFAULT_FIB); 1427 if (error) 1428 log(LOG_INFO, "%s: node-local all-nodes" 1429 "multicast address deletion error\n", 1430 __func__); 1431 } else { 1432 /* 1433 * Replace the gateway of the route. 1434 */ 1435 struct sockaddr_in6 sa; 1436 1437 bzero(&sa, sizeof(sa)); 1438 sa.sin6_len = sizeof(struct sockaddr_in6); 1439 sa.sin6_family = AF_INET6; 1440 memcpy(&sa.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, 1441 sizeof(sa.sin6_addr)); 1442 in6_setscope(&sa.sin6_addr, ifa0->ifa_ifp, NULL); 1443 memcpy(rt->rt_gateway, &sa, sizeof(sa)); 1444 RTFREE_LOCKED(rt); 1445 } 1446 } else { 1447 if (rt != NULL) 1448 RTFREE_LOCKED(rt); 1449 } 1450 1451 return (0); 1452 } 1453 1454 void 1455 in6_purgeaddr(struct ifaddr *ifa) 1456 { 1457 struct ifnet *ifp = ifa->ifa_ifp; 1458 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1459 int plen, error; 1460 struct ifaddr *ifa0; 1461 1462 if (ifa->ifa_carp) 1463 (*carp_detach_p)(ifa); 1464 1465 /* 1466 * find another IPv6 address as the gateway for the 1467 * link-local and node-local all-nodes multicast 1468 * address routes 1469 */ 1470 IF_ADDR_RLOCK(ifp); 1471 TAILQ_FOREACH(ifa0, &ifp->if_addrhead, ifa_link) { 1472 if ((ifa0->ifa_addr->sa_family != AF_INET6) || 1473 memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr, 1474 &ia->ia_addr.sin6_addr, 1475 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 int s = splnet(); 1525 1526 IF_ADDR_WLOCK(ifp); 1527 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1528 IF_ADDR_WUNLOCK(ifp); 1529 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1530 1531 /* 1532 * Defer the release of what might be the last reference to the 1533 * in6_ifaddr so that it can't be freed before the remainder of the 1534 * cleanup. 1535 */ 1536 IN6_IFADDR_WLOCK(); 1537 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 1538 IN6_IFADDR_WUNLOCK(); 1539 1540 /* 1541 * Release the reference to the base prefix. There should be a 1542 * positive reference. 1543 */ 1544 if (ia->ia6_ndpr == NULL) { 1545 nd6log((LOG_NOTICE, 1546 "in6_unlink_ifa: autoconf'ed address " 1547 "%p has no prefix\n", ia)); 1548 } else { 1549 ia->ia6_ndpr->ndpr_refcnt--; 1550 ia->ia6_ndpr = NULL; 1551 } 1552 1553 /* 1554 * Also, if the address being removed is autoconf'ed, call 1555 * pfxlist_onlink_check() since the release might affect the status of 1556 * other (detached) addresses. 1557 */ 1558 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1559 pfxlist_onlink_check(); 1560 } 1561 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1562 splx(s); 1563 } 1564 1565 void 1566 in6_purgeif(struct ifnet *ifp) 1567 { 1568 struct ifaddr *ifa, *nifa; 1569 1570 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) { 1571 if (ifa->ifa_addr->sa_family != AF_INET6) 1572 continue; 1573 in6_purgeaddr(ifa); 1574 } 1575 1576 in6_ifdetach(ifp); 1577 } 1578 1579 /* 1580 * SIOC[GAD]LIFADDR. 1581 * SIOCGLIFADDR: get first address. (?) 1582 * SIOCGLIFADDR with IFLR_PREFIX: 1583 * get first address that matches the specified prefix. 1584 * SIOCALIFADDR: add the specified address. 1585 * SIOCALIFADDR with IFLR_PREFIX: 1586 * add the specified prefix, filling hostid part from 1587 * the first link-local address. prefixlen must be <= 64. 1588 * SIOCDLIFADDR: delete the specified address. 1589 * SIOCDLIFADDR with IFLR_PREFIX: 1590 * delete the first address that matches the specified prefix. 1591 * return values: 1592 * EINVAL on invalid parameters 1593 * EADDRNOTAVAIL on prefix match failed/specified address not found 1594 * other values may be returned from in6_ioctl() 1595 * 1596 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1597 * this is to accomodate address naming scheme other than RFC2374, 1598 * in the future. 1599 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1600 * address encoding scheme. (see figure on page 8) 1601 */ 1602 static int 1603 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 1604 struct ifnet *ifp, struct thread *td) 1605 { 1606 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1607 struct ifaddr *ifa; 1608 struct sockaddr *sa; 1609 1610 /* sanity checks */ 1611 if (!data || !ifp) { 1612 panic("invalid argument to in6_lifaddr_ioctl"); 1613 /* NOTREACHED */ 1614 } 1615 1616 switch (cmd) { 1617 case SIOCGLIFADDR: 1618 /* address must be specified on GET with IFLR_PREFIX */ 1619 if ((iflr->flags & IFLR_PREFIX) == 0) 1620 break; 1621 /* FALLTHROUGH */ 1622 case SIOCALIFADDR: 1623 case SIOCDLIFADDR: 1624 /* address must be specified on ADD and DELETE */ 1625 sa = (struct sockaddr *)&iflr->addr; 1626 if (sa->sa_family != AF_INET6) 1627 return EINVAL; 1628 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1629 return EINVAL; 1630 /* XXX need improvement */ 1631 sa = (struct sockaddr *)&iflr->dstaddr; 1632 if (sa->sa_family && sa->sa_family != AF_INET6) 1633 return EINVAL; 1634 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1635 return EINVAL; 1636 break; 1637 default: /* shouldn't happen */ 1638 #if 0 1639 panic("invalid cmd to in6_lifaddr_ioctl"); 1640 /* NOTREACHED */ 1641 #else 1642 return EOPNOTSUPP; 1643 #endif 1644 } 1645 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) 1646 return EINVAL; 1647 1648 switch (cmd) { 1649 case SIOCALIFADDR: 1650 { 1651 struct in6_aliasreq ifra; 1652 struct in6_addr *hostid = NULL; 1653 int prefixlen; 1654 1655 ifa = NULL; 1656 if ((iflr->flags & IFLR_PREFIX) != 0) { 1657 struct sockaddr_in6 *sin6; 1658 1659 /* 1660 * hostid is to fill in the hostid part of the 1661 * address. hostid points to the first link-local 1662 * address attached to the interface. 1663 */ 1664 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1665 if (!ifa) 1666 return EADDRNOTAVAIL; 1667 hostid = IFA_IN6(ifa); 1668 1669 /* prefixlen must be <= 64. */ 1670 if (64 < iflr->prefixlen) 1671 return EINVAL; 1672 prefixlen = iflr->prefixlen; 1673 1674 /* hostid part must be zero. */ 1675 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1676 if (sin6->sin6_addr.s6_addr32[2] != 0 || 1677 sin6->sin6_addr.s6_addr32[3] != 0) { 1678 return EINVAL; 1679 } 1680 } else 1681 prefixlen = iflr->prefixlen; 1682 1683 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1684 bzero(&ifra, sizeof(ifra)); 1685 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name)); 1686 1687 bcopy(&iflr->addr, &ifra.ifra_addr, 1688 ((struct sockaddr *)&iflr->addr)->sa_len); 1689 if (hostid) { 1690 /* fill in hostid part */ 1691 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1692 hostid->s6_addr32[2]; 1693 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1694 hostid->s6_addr32[3]; 1695 } 1696 1697 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1698 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1699 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1700 if (hostid) { 1701 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1702 hostid->s6_addr32[2]; 1703 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1704 hostid->s6_addr32[3]; 1705 } 1706 } 1707 if (ifa != NULL) 1708 ifa_free(ifa); 1709 1710 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1711 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1712 1713 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1714 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td); 1715 } 1716 case SIOCGLIFADDR: 1717 case SIOCDLIFADDR: 1718 { 1719 struct in6_ifaddr *ia; 1720 struct in6_addr mask, candidate, match; 1721 struct sockaddr_in6 *sin6; 1722 int cmp; 1723 1724 bzero(&mask, sizeof(mask)); 1725 if (iflr->flags & IFLR_PREFIX) { 1726 /* lookup a prefix rather than address. */ 1727 in6_prefixlen2mask(&mask, iflr->prefixlen); 1728 1729 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1730 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1731 match.s6_addr32[0] &= mask.s6_addr32[0]; 1732 match.s6_addr32[1] &= mask.s6_addr32[1]; 1733 match.s6_addr32[2] &= mask.s6_addr32[2]; 1734 match.s6_addr32[3] &= mask.s6_addr32[3]; 1735 1736 /* if you set extra bits, that's wrong */ 1737 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1738 return EINVAL; 1739 1740 cmp = 1; 1741 } else { 1742 if (cmd == SIOCGLIFADDR) { 1743 /* on getting an address, take the 1st match */ 1744 cmp = 0; /* XXX */ 1745 } else { 1746 /* on deleting an address, do exact match */ 1747 in6_prefixlen2mask(&mask, 128); 1748 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1749 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1750 1751 cmp = 1; 1752 } 1753 } 1754 1755 IF_ADDR_RLOCK(ifp); 1756 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1757 if (ifa->ifa_addr->sa_family != AF_INET6) 1758 continue; 1759 if (!cmp) 1760 break; 1761 1762 /* 1763 * XXX: this is adhoc, but is necessary to allow 1764 * a user to specify fe80::/64 (not /10) for a 1765 * link-local address. 1766 */ 1767 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1768 in6_clearscope(&candidate); 1769 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1770 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1771 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1772 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1773 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1774 break; 1775 } 1776 if (ifa != NULL) 1777 ifa_ref(ifa); 1778 IF_ADDR_RUNLOCK(ifp); 1779 if (!ifa) 1780 return EADDRNOTAVAIL; 1781 ia = ifa2ia6(ifa); 1782 1783 if (cmd == SIOCGLIFADDR) { 1784 int error; 1785 1786 /* fill in the if_laddrreq structure */ 1787 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1788 error = sa6_recoverscope( 1789 (struct sockaddr_in6 *)&iflr->addr); 1790 if (error != 0) { 1791 ifa_free(ifa); 1792 return (error); 1793 } 1794 1795 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1796 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1797 ia->ia_dstaddr.sin6_len); 1798 error = sa6_recoverscope( 1799 (struct sockaddr_in6 *)&iflr->dstaddr); 1800 if (error != 0) { 1801 ifa_free(ifa); 1802 return (error); 1803 } 1804 } else 1805 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1806 1807 iflr->prefixlen = 1808 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1809 1810 iflr->flags = ia->ia6_flags; /* XXX */ 1811 ifa_free(ifa); 1812 1813 return 0; 1814 } else { 1815 struct in6_aliasreq ifra; 1816 1817 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1818 bzero(&ifra, sizeof(ifra)); 1819 bcopy(iflr->iflr_name, ifra.ifra_name, 1820 sizeof(ifra.ifra_name)); 1821 1822 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1823 ia->ia_addr.sin6_len); 1824 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1825 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1826 ia->ia_dstaddr.sin6_len); 1827 } else { 1828 bzero(&ifra.ifra_dstaddr, 1829 sizeof(ifra.ifra_dstaddr)); 1830 } 1831 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1832 ia->ia_prefixmask.sin6_len); 1833 1834 ifra.ifra_flags = ia->ia6_flags; 1835 ifa_free(ifa); 1836 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, 1837 ifp, td); 1838 } 1839 } 1840 } 1841 1842 return EOPNOTSUPP; /* just for safety */ 1843 } 1844 1845 /* 1846 * Initialize an interface's IPv6 address and routing table entry. 1847 */ 1848 static int 1849 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1850 struct sockaddr_in6 *sin6, int newhost) 1851 { 1852 int error = 0, plen, ifacount = 0; 1853 int s = splimp(); 1854 struct ifaddr *ifa; 1855 1856 /* 1857 * Give the interface a chance to initialize 1858 * if this is its first address, 1859 * and to validate the address if necessary. 1860 */ 1861 IF_ADDR_RLOCK(ifp); 1862 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1863 if (ifa->ifa_addr->sa_family != AF_INET6) 1864 continue; 1865 ifacount++; 1866 } 1867 IF_ADDR_RUNLOCK(ifp); 1868 1869 ia->ia_addr = *sin6; 1870 1871 if (ifacount <= 1 && ifp->if_ioctl) { 1872 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1873 if (error) { 1874 splx(s); 1875 return (error); 1876 } 1877 } 1878 splx(s); 1879 1880 ia->ia_ifa.ifa_metric = ifp->if_metric; 1881 1882 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1883 1884 /* 1885 * Special case: 1886 * If a new destination address is specified for a point-to-point 1887 * interface, install a route to the destination as an interface 1888 * direct route. 1889 * XXX: the logic below rejects assigning multiple addresses on a p2p 1890 * interface that share the same destination. 1891 */ 1892 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1893 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 && 1894 ia->ia_dstaddr.sin6_family == AF_INET6) { 1895 int rtflags = RTF_UP | RTF_HOST; 1896 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags); 1897 if (error) 1898 return (error); 1899 ia->ia_flags |= IFA_ROUTE; 1900 /* 1901 * Handle the case for ::1 . 1902 */ 1903 if (ifp->if_flags & IFF_LOOPBACK) 1904 ia->ia_flags |= IFA_RTSELF; 1905 } 1906 1907 /* 1908 * add a loopback route to self 1909 */ 1910 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) { 1911 error = ifa_add_loopback_route((struct ifaddr *)ia, 1912 (struct sockaddr *)&ia->ia_addr); 1913 if (error == 0) 1914 ia->ia_flags |= IFA_RTSELF; 1915 } 1916 1917 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1918 if (newhost) 1919 in6_ifaddloop(&(ia->ia_ifa)); 1920 1921 return (error); 1922 } 1923 1924 /* 1925 * Find an IPv6 interface link-local address specific to an interface. 1926 * ifaddr is returned referenced. 1927 */ 1928 struct in6_ifaddr * 1929 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1930 { 1931 struct ifaddr *ifa; 1932 1933 IF_ADDR_RLOCK(ifp); 1934 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1935 if (ifa->ifa_addr->sa_family != AF_INET6) 1936 continue; 1937 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1938 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1939 ignoreflags) != 0) 1940 continue; 1941 ifa_ref(ifa); 1942 break; 1943 } 1944 } 1945 IF_ADDR_RUNLOCK(ifp); 1946 1947 return ((struct in6_ifaddr *)ifa); 1948 } 1949 1950 1951 /* 1952 * find the internet address corresponding to a given interface and address. 1953 * ifaddr is returned referenced. 1954 */ 1955 struct in6_ifaddr * 1956 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr) 1957 { 1958 struct ifaddr *ifa; 1959 1960 IF_ADDR_RLOCK(ifp); 1961 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1962 if (ifa->ifa_addr->sa_family != AF_INET6) 1963 continue; 1964 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1965 ifa_ref(ifa); 1966 break; 1967 } 1968 } 1969 IF_ADDR_RUNLOCK(ifp); 1970 1971 return ((struct in6_ifaddr *)ifa); 1972 } 1973 1974 /* 1975 * Convert IP6 address to printable (loggable) representation. Caller 1976 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 1977 */ 1978 static char digits[] = "0123456789abcdef"; 1979 char * 1980 ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 1981 { 1982 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0; 1983 char *cp; 1984 const u_int16_t *a = (const u_int16_t *)addr; 1985 const u_int8_t *d; 1986 int dcolon = 0, zero = 0; 1987 1988 cp = ip6buf; 1989 1990 for (i = 0; i < 8; i++) { 1991 if (*(a + i) == 0) { 1992 cnt++; 1993 if (cnt == 1) 1994 idx = i; 1995 } 1996 else if (maxcnt < cnt) { 1997 maxcnt = cnt; 1998 index = idx; 1999 cnt = 0; 2000 } 2001 } 2002 if (maxcnt < cnt) { 2003 maxcnt = cnt; 2004 index = idx; 2005 } 2006 2007 for (i = 0; i < 8; i++) { 2008 if (dcolon == 1) { 2009 if (*a == 0) { 2010 if (i == 7) 2011 *cp++ = ':'; 2012 a++; 2013 continue; 2014 } else 2015 dcolon = 2; 2016 } 2017 if (*a == 0) { 2018 if (dcolon == 0 && *(a + 1) == 0 && i == index) { 2019 if (i == 0) 2020 *cp++ = ':'; 2021 *cp++ = ':'; 2022 dcolon = 1; 2023 } else { 2024 *cp++ = '0'; 2025 *cp++ = ':'; 2026 } 2027 a++; 2028 continue; 2029 } 2030 d = (const u_char *)a; 2031 /* Try to eliminate leading zeros in printout like in :0001. */ 2032 zero = 1; 2033 *cp = digits[*d >> 4]; 2034 if (*cp != '0') { 2035 zero = 0; 2036 cp++; 2037 } 2038 *cp = digits[*d++ & 0xf]; 2039 if (zero == 0 || (*cp != '0')) { 2040 zero = 0; 2041 cp++; 2042 } 2043 *cp = digits[*d >> 4]; 2044 if (zero == 0 || (*cp != '0')) { 2045 zero = 0; 2046 cp++; 2047 } 2048 *cp++ = digits[*d & 0xf]; 2049 *cp++ = ':'; 2050 a++; 2051 } 2052 *--cp = '\0'; 2053 return (ip6buf); 2054 } 2055 2056 int 2057 in6_localaddr(struct in6_addr *in6) 2058 { 2059 struct in6_ifaddr *ia; 2060 2061 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 2062 return 1; 2063 2064 IN6_IFADDR_RLOCK(); 2065 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 2066 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 2067 &ia->ia_prefixmask.sin6_addr)) { 2068 IN6_IFADDR_RUNLOCK(); 2069 return 1; 2070 } 2071 } 2072 IN6_IFADDR_RUNLOCK(); 2073 2074 return (0); 2075 } 2076 2077 /* 2078 * Return 1 if an internet address is for the local host and configured 2079 * on one of its interfaces. 2080 */ 2081 int 2082 in6_localip(struct in6_addr *in6) 2083 { 2084 struct in6_ifaddr *ia; 2085 2086 IN6_IFADDR_RLOCK(); 2087 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 2088 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) { 2089 IN6_IFADDR_RUNLOCK(); 2090 return (1); 2091 } 2092 } 2093 IN6_IFADDR_RUNLOCK(); 2094 return (0); 2095 } 2096 2097 2098 int 2099 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 2100 { 2101 struct in6_ifaddr *ia; 2102 2103 IN6_IFADDR_RLOCK(); 2104 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 2105 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 2106 &sa6->sin6_addr) && 2107 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) { 2108 IN6_IFADDR_RUNLOCK(); 2109 return (1); /* true */ 2110 } 2111 2112 /* XXX: do we still have to go thru the rest of the list? */ 2113 } 2114 IN6_IFADDR_RUNLOCK(); 2115 2116 return (0); /* false */ 2117 } 2118 2119 /* 2120 * return length of part which dst and src are equal 2121 * hard coding... 2122 */ 2123 int 2124 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 2125 { 2126 int match = 0; 2127 u_char *s = (u_char *)src, *d = (u_char *)dst; 2128 u_char *lim = s + 16, r; 2129 2130 while (s < lim) 2131 if ((r = (*d++ ^ *s++)) != 0) { 2132 while (r < 128) { 2133 match++; 2134 r <<= 1; 2135 } 2136 break; 2137 } else 2138 match += 8; 2139 return match; 2140 } 2141 2142 /* XXX: to be scope conscious */ 2143 int 2144 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 2145 { 2146 int bytelen, bitlen; 2147 2148 /* sanity check */ 2149 if (0 > len || len > 128) { 2150 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 2151 len); 2152 return (0); 2153 } 2154 2155 bytelen = len / 8; 2156 bitlen = len % 8; 2157 2158 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 2159 return (0); 2160 if (bitlen != 0 && 2161 p1->s6_addr[bytelen] >> (8 - bitlen) != 2162 p2->s6_addr[bytelen] >> (8 - bitlen)) 2163 return (0); 2164 2165 return (1); 2166 } 2167 2168 void 2169 in6_prefixlen2mask(struct in6_addr *maskp, int len) 2170 { 2171 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 2172 int bytelen, bitlen, i; 2173 2174 /* sanity check */ 2175 if (0 > len || len > 128) { 2176 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 2177 len); 2178 return; 2179 } 2180 2181 bzero(maskp, sizeof(*maskp)); 2182 bytelen = len / 8; 2183 bitlen = len % 8; 2184 for (i = 0; i < bytelen; i++) 2185 maskp->s6_addr[i] = 0xff; 2186 if (bitlen) 2187 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 2188 } 2189 2190 /* 2191 * return the best address out of the same scope. if no address was 2192 * found, return the first valid address from designated IF. 2193 */ 2194 struct in6_ifaddr * 2195 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2196 { 2197 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2198 struct ifaddr *ifa; 2199 struct in6_ifaddr *besta = 0; 2200 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2201 2202 dep[0] = dep[1] = NULL; 2203 2204 /* 2205 * We first look for addresses in the same scope. 2206 * If there is one, return it. 2207 * If two or more, return one which matches the dst longest. 2208 * If none, return one of global addresses assigned other ifs. 2209 */ 2210 IF_ADDR_RLOCK(ifp); 2211 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2212 if (ifa->ifa_addr->sa_family != AF_INET6) 2213 continue; 2214 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2215 continue; /* XXX: is there any case to allow anycast? */ 2216 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2217 continue; /* don't use this interface */ 2218 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2219 continue; 2220 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2221 if (V_ip6_use_deprecated) 2222 dep[0] = (struct in6_ifaddr *)ifa; 2223 continue; 2224 } 2225 2226 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2227 /* 2228 * call in6_matchlen() as few as possible 2229 */ 2230 if (besta) { 2231 if (blen == -1) 2232 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2233 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2234 if (tlen > blen) { 2235 blen = tlen; 2236 besta = (struct in6_ifaddr *)ifa; 2237 } 2238 } else 2239 besta = (struct in6_ifaddr *)ifa; 2240 } 2241 } 2242 if (besta) { 2243 ifa_ref(&besta->ia_ifa); 2244 IF_ADDR_RUNLOCK(ifp); 2245 return (besta); 2246 } 2247 2248 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2249 if (ifa->ifa_addr->sa_family != AF_INET6) 2250 continue; 2251 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2252 continue; /* XXX: is there any case to allow anycast? */ 2253 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2254 continue; /* don't use this interface */ 2255 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2256 continue; 2257 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2258 if (V_ip6_use_deprecated) 2259 dep[1] = (struct in6_ifaddr *)ifa; 2260 continue; 2261 } 2262 2263 if (ifa != NULL) 2264 ifa_ref(ifa); 2265 IF_ADDR_RUNLOCK(ifp); 2266 return (struct in6_ifaddr *)ifa; 2267 } 2268 IF_ADDR_RUNLOCK(ifp); 2269 2270 /* use the last-resort values, that are, deprecated addresses */ 2271 if (dep[0]) 2272 return dep[0]; 2273 if (dep[1]) 2274 return dep[1]; 2275 2276 return NULL; 2277 } 2278 2279 /* 2280 * perform DAD when interface becomes IFF_UP. 2281 */ 2282 void 2283 in6_if_up(struct ifnet *ifp) 2284 { 2285 struct ifaddr *ifa; 2286 struct in6_ifaddr *ia; 2287 2288 IF_ADDR_RLOCK(ifp); 2289 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2290 if (ifa->ifa_addr->sa_family != AF_INET6) 2291 continue; 2292 ia = (struct in6_ifaddr *)ifa; 2293 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2294 /* 2295 * The TENTATIVE flag was likely set by hand 2296 * beforehand, implicitly indicating the need for DAD. 2297 * We may be able to skip the random delay in this 2298 * case, but we impose delays just in case. 2299 */ 2300 nd6_dad_start(ifa, 2301 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 2302 } 2303 } 2304 IF_ADDR_RUNLOCK(ifp); 2305 2306 /* 2307 * special cases, like 6to4, are handled in in6_ifattach 2308 */ 2309 in6_ifattach(ifp, NULL); 2310 } 2311 2312 int 2313 in6if_do_dad(struct ifnet *ifp) 2314 { 2315 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 2316 return (0); 2317 2318 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 2319 return (0); 2320 2321 switch (ifp->if_type) { 2322 #ifdef IFT_DUMMY 2323 case IFT_DUMMY: 2324 #endif 2325 case IFT_FAITH: 2326 /* 2327 * These interfaces do not have the IFF_LOOPBACK flag, 2328 * but loop packets back. We do not have to do DAD on such 2329 * interfaces. We should even omit it, because loop-backed 2330 * NS would confuse the DAD procedure. 2331 */ 2332 return (0); 2333 default: 2334 /* 2335 * Our DAD routine requires the interface up and running. 2336 * However, some interfaces can be up before the RUNNING 2337 * status. Additionaly, users may try to assign addresses 2338 * before the interface becomes up (or running). 2339 * We simply skip DAD in such a case as a work around. 2340 * XXX: we should rather mark "tentative" on such addresses, 2341 * and do DAD after the interface becomes ready. 2342 */ 2343 if (!((ifp->if_flags & IFF_UP) && 2344 (ifp->if_drv_flags & IFF_DRV_RUNNING))) 2345 return (0); 2346 2347 return (1); 2348 } 2349 } 2350 2351 /* 2352 * Calculate max IPv6 MTU through all the interfaces and store it 2353 * to in6_maxmtu. 2354 */ 2355 void 2356 in6_setmaxmtu(void) 2357 { 2358 unsigned long maxmtu = 0; 2359 struct ifnet *ifp; 2360 2361 IFNET_RLOCK_NOSLEEP(); 2362 TAILQ_FOREACH(ifp, &V_ifnet, if_list) { 2363 /* this function can be called during ifnet initialization */ 2364 if (!ifp->if_afdata[AF_INET6]) 2365 continue; 2366 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2367 IN6_LINKMTU(ifp) > maxmtu) 2368 maxmtu = IN6_LINKMTU(ifp); 2369 } 2370 IFNET_RUNLOCK_NOSLEEP(); 2371 if (maxmtu) /* update only when maxmtu is positive */ 2372 V_in6_maxmtu = maxmtu; 2373 } 2374 2375 /* 2376 * Provide the length of interface identifiers to be used for the link attached 2377 * to the given interface. The length should be defined in "IPv6 over 2378 * xxx-link" document. Note that address architecture might also define 2379 * the length for a particular set of address prefixes, regardless of the 2380 * link type. As clarified in rfc2462bis, those two definitions should be 2381 * consistent, and those really are as of August 2004. 2382 */ 2383 int 2384 in6_if2idlen(struct ifnet *ifp) 2385 { 2386 switch (ifp->if_type) { 2387 case IFT_ETHER: /* RFC2464 */ 2388 #ifdef IFT_PROPVIRTUAL 2389 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2390 #endif 2391 #ifdef IFT_L2VLAN 2392 case IFT_L2VLAN: /* ditto */ 2393 #endif 2394 #ifdef IFT_IEEE80211 2395 case IFT_IEEE80211: /* ditto */ 2396 #endif 2397 #ifdef IFT_MIP 2398 case IFT_MIP: /* ditto */ 2399 #endif 2400 case IFT_INFINIBAND: 2401 return (64); 2402 case IFT_FDDI: /* RFC2467 */ 2403 return (64); 2404 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 2405 return (64); 2406 case IFT_PPP: /* RFC2472 */ 2407 return (64); 2408 case IFT_ARCNET: /* RFC2497 */ 2409 return (64); 2410 case IFT_FRELAY: /* RFC2590 */ 2411 return (64); 2412 case IFT_IEEE1394: /* RFC3146 */ 2413 return (64); 2414 case IFT_GIF: 2415 return (64); /* draft-ietf-v6ops-mech-v2-07 */ 2416 case IFT_LOOP: 2417 return (64); /* XXX: is this really correct? */ 2418 default: 2419 /* 2420 * Unknown link type: 2421 * It might be controversial to use the today's common constant 2422 * of 64 for these cases unconditionally. For full compliance, 2423 * we should return an error in this case. On the other hand, 2424 * if we simply miss the standard for the link type or a new 2425 * standard is defined for a new link type, the IFID length 2426 * is very likely to be the common constant. As a compromise, 2427 * we always use the constant, but make an explicit notice 2428 * indicating the "unknown" case. 2429 */ 2430 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2431 return (64); 2432 } 2433 } 2434 2435 #include <sys/sysctl.h> 2436 2437 struct in6_llentry { 2438 struct llentry base; 2439 struct sockaddr_in6 l3_addr6; 2440 }; 2441 2442 /* 2443 * Deletes an address from the address table. 2444 * This function is called by the timer functions 2445 * such as arptimer() and nd6_llinfo_timer(), and 2446 * the caller does the locking. 2447 */ 2448 static void 2449 in6_lltable_free(struct lltable *llt, struct llentry *lle) 2450 { 2451 LLE_WUNLOCK(lle); 2452 LLE_LOCK_DESTROY(lle); 2453 free(lle, M_LLTABLE); 2454 } 2455 2456 static struct llentry * 2457 in6_lltable_new(const struct sockaddr *l3addr, u_int flags) 2458 { 2459 struct in6_llentry *lle; 2460 2461 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, 2462 M_DONTWAIT | M_ZERO); 2463 if (lle == NULL) /* NB: caller generates msg */ 2464 return NULL; 2465 2466 lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr; 2467 lle->base.lle_refcnt = 1; 2468 lle->base.lle_free = in6_lltable_free; 2469 LLE_LOCK_INIT(&lle->base); 2470 callout_init_rw(&lle->base.ln_timer_ch, &lle->base.lle_lock, 2471 CALLOUT_RETURNUNLOCKED); 2472 2473 return &lle->base; 2474 } 2475 2476 static void 2477 in6_lltable_prefix_free(struct lltable *llt, 2478 const struct sockaddr *prefix, 2479 const struct sockaddr *mask, 2480 u_int flags) 2481 { 2482 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix; 2483 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask; 2484 struct llentry *lle, *next; 2485 register int i; 2486 2487 /* 2488 * (flags & LLE_STATIC) means deleting all entries 2489 * including static ND6 entries 2490 */ 2491 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) { 2492 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 2493 if (IN6_ARE_MASKED_ADDR_EQUAL( 2494 &((struct sockaddr_in6 *)L3_ADDR(lle))->sin6_addr, 2495 &pfx->sin6_addr, 2496 &msk->sin6_addr) && 2497 ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) { 2498 int canceled; 2499 2500 canceled = callout_drain(&lle->la_timer); 2501 LLE_WLOCK(lle); 2502 if (canceled) 2503 LLE_REMREF(lle); 2504 llentry_free(lle); 2505 } 2506 } 2507 } 2508 } 2509 2510 static int 2511 in6_lltable_rtcheck(struct ifnet *ifp, 2512 u_int flags, 2513 const struct sockaddr *l3addr) 2514 { 2515 struct rtentry *rt; 2516 char ip6buf[INET6_ADDRSTRLEN]; 2517 2518 KASSERT(l3addr->sa_family == AF_INET6, 2519 ("sin_family %d", l3addr->sa_family)); 2520 2521 /* Our local addresses are always only installed on the default FIB. */ 2522 /* XXX rtalloc1 should take a const param */ 2523 rt = in6_rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0, 2524 RT_DEFAULT_FIB); 2525 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 2526 struct ifaddr *ifa; 2527 /* 2528 * Create an ND6 cache for an IPv6 neighbor 2529 * that is not covered by our own prefix. 2530 */ 2531 /* XXX ifaof_ifpforaddr should take a const param */ 2532 ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp); 2533 if (ifa != NULL) { 2534 ifa_free(ifa); 2535 if (rt != NULL) 2536 RTFREE_LOCKED(rt); 2537 return 0; 2538 } 2539 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2540 ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr)); 2541 if (rt != NULL) 2542 RTFREE_LOCKED(rt); 2543 return EINVAL; 2544 } 2545 RTFREE_LOCKED(rt); 2546 return 0; 2547 } 2548 2549 static struct llentry * 2550 in6_lltable_lookup(struct lltable *llt, u_int flags, 2551 const struct sockaddr *l3addr) 2552 { 2553 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2554 struct ifnet *ifp = llt->llt_ifp; 2555 struct llentry *lle; 2556 struct llentries *lleh; 2557 u_int hashkey; 2558 2559 IF_AFDATA_LOCK_ASSERT(ifp); 2560 KASSERT(l3addr->sa_family == AF_INET6, 2561 ("sin_family %d", l3addr->sa_family)); 2562 2563 hashkey = sin6->sin6_addr.s6_addr32[3]; 2564 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 2565 LIST_FOREACH(lle, lleh, lle_next) { 2566 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle); 2567 if (lle->la_flags & LLE_DELETED) 2568 continue; 2569 if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr, 2570 sizeof(struct in6_addr)) == 0) 2571 break; 2572 } 2573 2574 if (lle == NULL) { 2575 if (!(flags & LLE_CREATE)) 2576 return (NULL); 2577 /* 2578 * A route that covers the given address must have 2579 * been installed 1st because we are doing a resolution, 2580 * verify this. 2581 */ 2582 if (!(flags & LLE_IFADDR) && 2583 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2584 return NULL; 2585 2586 lle = in6_lltable_new(l3addr, flags); 2587 if (lle == NULL) { 2588 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2589 return NULL; 2590 } 2591 lle->la_flags = flags & ~LLE_CREATE; 2592 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 2593 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 2594 lle->la_flags |= (LLE_VALID | LLE_STATIC); 2595 } 2596 2597 lle->lle_tbl = llt; 2598 lle->lle_head = lleh; 2599 LIST_INSERT_HEAD(lleh, lle, lle_next); 2600 } else if (flags & LLE_DELETE) { 2601 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 2602 LLE_WLOCK(lle); 2603 lle->la_flags = LLE_DELETED; 2604 LLE_WUNLOCK(lle); 2605 #ifdef DIAGNOSTIC 2606 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2607 #endif 2608 } 2609 lle = (void *)-1; 2610 } 2611 if (LLE_IS_VALID(lle)) { 2612 if (flags & LLE_EXCLUSIVE) 2613 LLE_WLOCK(lle); 2614 else 2615 LLE_RLOCK(lle); 2616 } 2617 return (lle); 2618 } 2619 2620 static int 2621 in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 2622 { 2623 struct ifnet *ifp = llt->llt_ifp; 2624 struct llentry *lle; 2625 /* XXX stack use */ 2626 struct { 2627 struct rt_msghdr rtm; 2628 struct sockaddr_in6 sin6; 2629 /* 2630 * ndp.c assumes that sdl is word aligned 2631 */ 2632 #ifdef __LP64__ 2633 uint32_t pad; 2634 #endif 2635 struct sockaddr_dl sdl; 2636 } ndpc; 2637 int i, error; 2638 2639 if (ifp->if_flags & IFF_LOOPBACK) 2640 return 0; 2641 2642 LLTABLE_LOCK_ASSERT(); 2643 2644 error = 0; 2645 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 2646 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 2647 struct sockaddr_dl *sdl; 2648 2649 /* skip deleted or invalid entries */ 2650 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID) 2651 continue; 2652 /* Skip if jailed and not a valid IP of the prison. */ 2653 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 2654 continue; 2655 /* 2656 * produce a msg made of: 2657 * struct rt_msghdr; 2658 * struct sockaddr_in6 (IPv6) 2659 * struct sockaddr_dl; 2660 */ 2661 bzero(&ndpc, sizeof(ndpc)); 2662 ndpc.rtm.rtm_msglen = sizeof(ndpc); 2663 ndpc.rtm.rtm_version = RTM_VERSION; 2664 ndpc.rtm.rtm_type = RTM_GET; 2665 ndpc.rtm.rtm_flags = RTF_UP; 2666 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 2667 ndpc.sin6.sin6_family = AF_INET6; 2668 ndpc.sin6.sin6_len = sizeof(ndpc.sin6); 2669 bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle)); 2670 2671 /* publish */ 2672 if (lle->la_flags & LLE_PUB) 2673 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE; 2674 2675 sdl = &ndpc.sdl; 2676 sdl->sdl_family = AF_LINK; 2677 sdl->sdl_len = sizeof(*sdl); 2678 sdl->sdl_alen = ifp->if_addrlen; 2679 sdl->sdl_index = ifp->if_index; 2680 sdl->sdl_type = ifp->if_type; 2681 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 2682 ndpc.rtm.rtm_rmx.rmx_expire = 2683 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 2684 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 2685 if (lle->la_flags & LLE_STATIC) 2686 ndpc.rtm.rtm_flags |= RTF_STATIC; 2687 ndpc.rtm.rtm_index = ifp->if_index; 2688 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc)); 2689 if (error) 2690 break; 2691 } 2692 } 2693 return error; 2694 } 2695 2696 void * 2697 in6_domifattach(struct ifnet *ifp) 2698 { 2699 struct in6_ifextra *ext; 2700 2701 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2702 bzero(ext, sizeof(*ext)); 2703 2704 ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat), 2705 M_IFADDR, M_WAITOK); 2706 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat)); 2707 2708 ext->icmp6_ifstat = 2709 (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat), 2710 M_IFADDR, M_WAITOK); 2711 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat)); 2712 2713 ext->nd_ifinfo = nd6_ifattach(ifp); 2714 ext->scope6_id = scope6_ifattach(ifp); 2715 ext->lltable = lltable_init(ifp, AF_INET6); 2716 if (ext->lltable != NULL) { 2717 ext->lltable->llt_prefix_free = in6_lltable_prefix_free; 2718 ext->lltable->llt_lookup = in6_lltable_lookup; 2719 ext->lltable->llt_dump = in6_lltable_dump; 2720 } 2721 2722 ext->mld_ifinfo = mld_domifattach(ifp); 2723 2724 return ext; 2725 } 2726 2727 void 2728 in6_domifdetach(struct ifnet *ifp, void *aux) 2729 { 2730 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2731 2732 mld_domifdetach(ifp); 2733 scope6_ifdetach(ext->scope6_id); 2734 nd6_ifdetach(ext->nd_ifinfo); 2735 lltable_free(ext->lltable); 2736 free(ext->in6_ifstat, M_IFADDR); 2737 free(ext->icmp6_ifstat, M_IFADDR); 2738 free(ext, M_IFADDR); 2739 } 2740 2741 /* 2742 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2743 * v4 mapped addr or v4 compat addr 2744 */ 2745 void 2746 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2747 { 2748 2749 bzero(sin, sizeof(*sin)); 2750 sin->sin_len = sizeof(struct sockaddr_in); 2751 sin->sin_family = AF_INET; 2752 sin->sin_port = sin6->sin6_port; 2753 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2754 } 2755 2756 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2757 void 2758 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2759 { 2760 bzero(sin6, sizeof(*sin6)); 2761 sin6->sin6_len = sizeof(struct sockaddr_in6); 2762 sin6->sin6_family = AF_INET6; 2763 sin6->sin6_port = sin->sin_port; 2764 sin6->sin6_addr.s6_addr32[0] = 0; 2765 sin6->sin6_addr.s6_addr32[1] = 0; 2766 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2767 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2768 } 2769 2770 /* Convert sockaddr_in6 into sockaddr_in. */ 2771 void 2772 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2773 { 2774 struct sockaddr_in *sin_p; 2775 struct sockaddr_in6 sin6; 2776 2777 /* 2778 * Save original sockaddr_in6 addr and convert it 2779 * to sockaddr_in. 2780 */ 2781 sin6 = *(struct sockaddr_in6 *)nam; 2782 sin_p = (struct sockaddr_in *)nam; 2783 in6_sin6_2_sin(sin_p, &sin6); 2784 } 2785 2786 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2787 void 2788 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2789 { 2790 struct sockaddr_in *sin_p; 2791 struct sockaddr_in6 *sin6_p; 2792 2793 sin6_p = malloc(sizeof *sin6_p, M_SONAME, 2794 M_WAITOK); 2795 sin_p = (struct sockaddr_in *)*nam; 2796 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2797 free(*nam, M_SONAME); 2798 *nam = (struct sockaddr *)sin6_p; 2799 } 2800