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 rt_newaddrmsg(RTM_ADD, ifa, 0, &rt); 184 } 185 186 void 187 in6_ifremloop(struct ifaddr *ifa) 188 { 189 struct sockaddr_dl gateway; 190 struct sockaddr_in6 mask, addr; 191 struct rtentry rt0; 192 struct in6_ifaddr *ia; 193 struct ifnet *ifp; 194 195 ia = ifa2ia6(ifa); 196 ifp = ifa->ifa_ifp; 197 IF_AFDATA_LOCK(ifp); 198 lla_lookup(LLTABLE6(ifp), (LLE_DELETE | LLE_IFADDR), 199 (struct sockaddr *)&ia->ia_addr); 200 IF_AFDATA_UNLOCK(ifp); 201 202 /* 203 * initialize for rtmsg generation 204 */ 205 bzero(&gateway, sizeof(gateway)); 206 gateway.sdl_len = sizeof(gateway); 207 gateway.sdl_family = AF_LINK; 208 gateway.sdl_nlen = 0; 209 gateway.sdl_alen = ifp->if_addrlen; 210 bzero(&rt0, sizeof(rt0)); 211 rt0.rt_gateway = (struct sockaddr *)&gateway; 212 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 213 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr)); 214 rt_mask(&rt0) = (struct sockaddr *)&mask; 215 rt_key(&rt0) = (struct sockaddr *)&addr; 216 rt0.rt_flags = RTF_HOST | RTF_STATIC; 217 rt_newaddrmsg(RTM_DELETE, ifa, 0, &rt0); 218 } 219 220 int 221 in6_mask2len(struct in6_addr *mask, u_char *lim0) 222 { 223 int x = 0, y; 224 u_char *lim = lim0, *p; 225 226 /* ignore the scope_id part */ 227 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 228 lim = (u_char *)mask + sizeof(*mask); 229 for (p = (u_char *)mask; p < lim; x++, p++) { 230 if (*p != 0xff) 231 break; 232 } 233 y = 0; 234 if (p < lim) { 235 for (y = 0; y < 8; y++) { 236 if ((*p & (0x80 >> y)) == 0) 237 break; 238 } 239 } 240 241 /* 242 * when the limit pointer is given, do a stricter check on the 243 * remaining bits. 244 */ 245 if (p < lim) { 246 if (y != 0 && (*p & (0x00ff >> y)) != 0) 247 return (-1); 248 for (p = p + 1; p < lim; p++) 249 if (*p != 0) 250 return (-1); 251 } 252 253 return x * 8 + y; 254 } 255 256 #ifdef COMPAT_FREEBSD32 257 struct in6_ndifreq32 { 258 char ifname[IFNAMSIZ]; 259 uint32_t ifindex; 260 }; 261 #define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32) 262 #endif 263 264 int 265 in6_control(struct socket *so, u_long cmd, caddr_t data, 266 struct ifnet *ifp, struct thread *td) 267 { 268 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 269 struct in6_ifaddr *ia = NULL; 270 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 271 struct sockaddr_in6 *sa6; 272 int carp_attached = 0; 273 int error; 274 u_long ocmd = cmd; 275 276 /* 277 * Compat to make pre-10.x ifconfig(8) operable. 278 */ 279 if (cmd == OSIOCAIFADDR_IN6) 280 cmd = SIOCAIFADDR_IN6; 281 282 switch (cmd) { 283 case SIOCGETSGCNT_IN6: 284 case SIOCGETMIFCNT_IN6: 285 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP); 286 } 287 288 switch(cmd) { 289 case SIOCAADDRCTL_POLICY: 290 case SIOCDADDRCTL_POLICY: 291 if (td != NULL) { 292 error = priv_check(td, PRIV_NETINET_ADDRCTRL6); 293 if (error) 294 return (error); 295 } 296 return (in6_src_ioctl(cmd, data)); 297 } 298 299 if (ifp == NULL) 300 return (EOPNOTSUPP); 301 302 switch (cmd) { 303 case SIOCSNDFLUSH_IN6: 304 case SIOCSPFXFLUSH_IN6: 305 case SIOCSRTRFLUSH_IN6: 306 case SIOCSDEFIFACE_IN6: 307 case SIOCSIFINFO_FLAGS: 308 case SIOCSIFINFO_IN6: 309 if (td != NULL) { 310 error = priv_check(td, PRIV_NETINET_ND6); 311 if (error) 312 return (error); 313 } 314 /* FALLTHROUGH */ 315 case OSIOCGIFINFO_IN6: 316 case SIOCGIFINFO_IN6: 317 case SIOCGDRLST_IN6: 318 case SIOCGPRLST_IN6: 319 case SIOCGNBRINFO_IN6: 320 case SIOCGDEFIFACE_IN6: 321 return (nd6_ioctl(cmd, data, ifp)); 322 323 #ifdef COMPAT_FREEBSD32 324 case SIOCGDEFIFACE32_IN6: 325 { 326 struct in6_ndifreq ndif; 327 struct in6_ndifreq32 *ndif32; 328 329 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif, 330 ifp); 331 if (error) 332 return (error); 333 ndif32 = (struct in6_ndifreq32 *)data; 334 ndif32->ifindex = ndif.ifindex; 335 return (0); 336 } 337 #endif 338 } 339 340 switch (cmd) { 341 case SIOCSIFPREFIX_IN6: 342 case SIOCDIFPREFIX_IN6: 343 case SIOCAIFPREFIX_IN6: 344 case SIOCCIFPREFIX_IN6: 345 case SIOCSGIFPREFIX_IN6: 346 case SIOCGIFPREFIX_IN6: 347 log(LOG_NOTICE, 348 "prefix ioctls are now invalidated. " 349 "please use ifconfig.\n"); 350 return (EOPNOTSUPP); 351 } 352 353 switch (cmd) { 354 case SIOCSSCOPE6: 355 if (td != NULL) { 356 error = priv_check(td, PRIV_NETINET_SCOPE6); 357 if (error) 358 return (error); 359 } 360 return (scope6_set(ifp, 361 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 362 case SIOCGSCOPE6: 363 return (scope6_get(ifp, 364 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 365 case SIOCGSCOPE6DEF: 366 return (scope6_get_default((struct scope6_id *) 367 ifr->ifr_ifru.ifru_scope_id)); 368 } 369 370 switch (cmd) { 371 case SIOCALIFADDR: 372 if (td != NULL) { 373 error = priv_check(td, PRIV_NET_ADDIFADDR); 374 if (error) 375 return (error); 376 } 377 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 378 379 case SIOCDLIFADDR: 380 if (td != NULL) { 381 error = priv_check(td, PRIV_NET_DELIFADDR); 382 if (error) 383 return (error); 384 } 385 /* FALLTHROUGH */ 386 case SIOCGLIFADDR: 387 return in6_lifaddr_ioctl(so, cmd, data, ifp, td); 388 } 389 390 /* 391 * Find address for this interface, if it exists. 392 * 393 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 394 * only, and used the first interface address as the target of other 395 * operations (without checking ifra_addr). This was because netinet 396 * code/API assumed at most 1 interface address per interface. 397 * Since IPv6 allows a node to assign multiple addresses 398 * on a single interface, we almost always look and check the 399 * presence of ifra_addr, and reject invalid ones here. 400 * It also decreases duplicated code among SIOC*_IN6 operations. 401 */ 402 switch (cmd) { 403 case SIOCAIFADDR_IN6: 404 case SIOCSIFPHYADDR_IN6: 405 sa6 = &ifra->ifra_addr; 406 break; 407 case SIOCSIFADDR_IN6: 408 case SIOCGIFADDR_IN6: 409 case SIOCSIFDSTADDR_IN6: 410 case SIOCSIFNETMASK_IN6: 411 case SIOCGIFDSTADDR_IN6: 412 case SIOCGIFNETMASK_IN6: 413 case SIOCDIFADDR_IN6: 414 case SIOCGIFPSRCADDR_IN6: 415 case SIOCGIFPDSTADDR_IN6: 416 case SIOCGIFAFLAG_IN6: 417 case SIOCSNDFLUSH_IN6: 418 case SIOCSPFXFLUSH_IN6: 419 case SIOCSRTRFLUSH_IN6: 420 case SIOCGIFALIFETIME_IN6: 421 case SIOCSIFALIFETIME_IN6: 422 case SIOCGIFSTAT_IN6: 423 case SIOCGIFSTAT_ICMP6: 424 sa6 = &ifr->ifr_addr; 425 break; 426 default: 427 sa6 = NULL; 428 break; 429 } 430 if (sa6 && sa6->sin6_family == AF_INET6) { 431 if (sa6->sin6_scope_id != 0) 432 error = sa6_embedscope(sa6, 0); 433 else 434 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 435 if (error != 0) 436 return (error); 437 if (td != NULL && (error = prison_check_ip6(td->td_ucred, 438 &sa6->sin6_addr)) != 0) 439 return (error); 440 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 441 } else 442 ia = NULL; 443 444 switch (cmd) { 445 case SIOCSIFADDR_IN6: 446 case SIOCSIFDSTADDR_IN6: 447 case SIOCSIFNETMASK_IN6: 448 /* 449 * Since IPv6 allows a node to assign multiple addresses 450 * on a single interface, SIOCSIFxxx ioctls are deprecated. 451 */ 452 /* we decided to obsolete this command (20000704) */ 453 error = EINVAL; 454 goto out; 455 456 case SIOCDIFADDR_IN6: 457 /* 458 * for IPv4, we look for existing in_ifaddr here to allow 459 * "ifconfig if0 delete" to remove the first IPv4 address on 460 * the interface. For IPv6, as the spec allows multiple 461 * interface address from the day one, we consider "remove the 462 * first one" semantics to be not preferable. 463 */ 464 if (ia == NULL) { 465 error = EADDRNOTAVAIL; 466 goto out; 467 } 468 /* FALLTHROUGH */ 469 case SIOCAIFADDR_IN6: 470 /* 471 * We always require users to specify a valid IPv6 address for 472 * the corresponding operation. 473 */ 474 if (ifra->ifra_addr.sin6_family != AF_INET6 || 475 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 476 error = EAFNOSUPPORT; 477 goto out; 478 } 479 480 if (td != NULL) { 481 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 482 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR); 483 if (error) 484 goto out; 485 } 486 break; 487 488 case SIOCGIFADDR_IN6: 489 /* This interface is basically deprecated. use SIOCGIFCONF. */ 490 /* FALLTHROUGH */ 491 case SIOCGIFAFLAG_IN6: 492 case SIOCGIFNETMASK_IN6: 493 case SIOCGIFDSTADDR_IN6: 494 case SIOCGIFALIFETIME_IN6: 495 /* must think again about its semantics */ 496 if (ia == NULL) { 497 error = EADDRNOTAVAIL; 498 goto out; 499 } 500 break; 501 502 case SIOCSIFALIFETIME_IN6: 503 { 504 struct in6_addrlifetime *lt; 505 506 if (td != NULL) { 507 error = priv_check(td, PRIV_NETINET_ALIFETIME6); 508 if (error) 509 goto out; 510 } 511 if (ia == NULL) { 512 error = EADDRNOTAVAIL; 513 goto out; 514 } 515 /* sanity for overflow - beware unsigned */ 516 lt = &ifr->ifr_ifru.ifru_lifetime; 517 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME && 518 lt->ia6t_vltime + time_second < time_second) { 519 error = EINVAL; 520 goto out; 521 } 522 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME && 523 lt->ia6t_pltime + time_second < time_second) { 524 error = EINVAL; 525 goto out; 526 } 527 break; 528 } 529 } 530 531 switch (cmd) { 532 case SIOCGIFADDR_IN6: 533 ifr->ifr_addr = ia->ia_addr; 534 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 535 goto out; 536 break; 537 538 case SIOCGIFDSTADDR_IN6: 539 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 540 error = EINVAL; 541 goto out; 542 } 543 /* 544 * XXX: should we check if ifa_dstaddr is NULL and return 545 * an error? 546 */ 547 ifr->ifr_dstaddr = ia->ia_dstaddr; 548 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 549 goto out; 550 break; 551 552 case SIOCGIFNETMASK_IN6: 553 ifr->ifr_addr = ia->ia_prefixmask; 554 break; 555 556 case SIOCGIFAFLAG_IN6: 557 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 558 break; 559 560 case SIOCGIFSTAT_IN6: 561 if (ifp == NULL) { 562 error = EINVAL; 563 goto out; 564 } 565 bzero(&ifr->ifr_ifru.ifru_stat, 566 sizeof(ifr->ifr_ifru.ifru_stat)); 567 ifr->ifr_ifru.ifru_stat = 568 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->in6_ifstat; 569 break; 570 571 case SIOCGIFSTAT_ICMP6: 572 if (ifp == NULL) { 573 error = EINVAL; 574 goto out; 575 } 576 bzero(&ifr->ifr_ifru.ifru_icmp6stat, 577 sizeof(ifr->ifr_ifru.ifru_icmp6stat)); 578 ifr->ifr_ifru.ifru_icmp6stat = 579 *((struct in6_ifextra *)ifp->if_afdata[AF_INET6])->icmp6_ifstat; 580 break; 581 582 case SIOCGIFALIFETIME_IN6: 583 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 584 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 585 time_t maxexpire; 586 struct in6_addrlifetime *retlt = 587 &ifr->ifr_ifru.ifru_lifetime; 588 589 /* 590 * XXX: adjust expiration time assuming time_t is 591 * signed. 592 */ 593 maxexpire = (-1) & 594 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 595 if (ia->ia6_lifetime.ia6t_vltime < 596 maxexpire - ia->ia6_updatetime) { 597 retlt->ia6t_expire = ia->ia6_updatetime + 598 ia->ia6_lifetime.ia6t_vltime; 599 } else 600 retlt->ia6t_expire = maxexpire; 601 } 602 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 603 time_t maxexpire; 604 struct in6_addrlifetime *retlt = 605 &ifr->ifr_ifru.ifru_lifetime; 606 607 /* 608 * XXX: adjust expiration time assuming time_t is 609 * signed. 610 */ 611 maxexpire = (-1) & 612 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 613 if (ia->ia6_lifetime.ia6t_pltime < 614 maxexpire - ia->ia6_updatetime) { 615 retlt->ia6t_preferred = ia->ia6_updatetime + 616 ia->ia6_lifetime.ia6t_pltime; 617 } else 618 retlt->ia6t_preferred = maxexpire; 619 } 620 break; 621 622 case SIOCSIFALIFETIME_IN6: 623 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; 624 /* for sanity */ 625 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 626 ia->ia6_lifetime.ia6t_expire = 627 time_second + ia->ia6_lifetime.ia6t_vltime; 628 } else 629 ia->ia6_lifetime.ia6t_expire = 0; 630 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 631 ia->ia6_lifetime.ia6t_preferred = 632 time_second + ia->ia6_lifetime.ia6t_pltime; 633 } else 634 ia->ia6_lifetime.ia6t_preferred = 0; 635 break; 636 637 case SIOCAIFADDR_IN6: 638 { 639 int i; 640 struct nd_prefixctl pr0; 641 struct nd_prefix *pr; 642 643 /* 644 * first, make or update the interface address structure, 645 * and link it to the list. 646 */ 647 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 648 goto out; 649 if (ia != NULL) 650 ifa_free(&ia->ia_ifa); 651 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 652 == NULL) { 653 /* 654 * this can happen when the user specify the 0 valid 655 * lifetime. 656 */ 657 break; 658 } 659 660 if (cmd == ocmd && ifra->ifra_vhid > 0) { 661 if (carp_attach_p != NULL) 662 error = (*carp_attach_p)(&ia->ia_ifa, 663 ifra->ifra_vhid); 664 else 665 error = EPROTONOSUPPORT; 666 if (error) 667 goto out; 668 else 669 carp_attached = 1; 670 } 671 672 /* 673 * then, make the prefix on-link on the interface. 674 * XXX: we'd rather create the prefix before the address, but 675 * we need at least one address to install the corresponding 676 * interface route, so we configure the address first. 677 */ 678 679 /* 680 * convert mask to prefix length (prefixmask has already 681 * been validated in in6_update_ifa(). 682 */ 683 bzero(&pr0, sizeof(pr0)); 684 pr0.ndpr_ifp = ifp; 685 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 686 NULL); 687 if (pr0.ndpr_plen == 128) { 688 break; /* we don't need to install a host route. */ 689 } 690 pr0.ndpr_prefix = ifra->ifra_addr; 691 /* apply the mask for safety. */ 692 for (i = 0; i < 4; i++) { 693 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 694 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i]; 695 } 696 /* 697 * XXX: since we don't have an API to set prefix (not address) 698 * lifetimes, we just use the same lifetimes as addresses. 699 * The (temporarily) installed lifetimes can be overridden by 700 * later advertised RAs (when accept_rtadv is non 0), which is 701 * an intended behavior. 702 */ 703 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 704 pr0.ndpr_raf_auto = 705 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 706 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 707 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 708 709 /* add the prefix if not yet. */ 710 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 711 /* 712 * nd6_prelist_add will install the corresponding 713 * interface route. 714 */ 715 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) { 716 if (carp_attached) 717 (*carp_detach_p)(&ia->ia_ifa); 718 goto out; 719 } 720 if (pr == NULL) { 721 if (carp_attached) 722 (*carp_detach_p)(&ia->ia_ifa); 723 log(LOG_ERR, "nd6_prelist_add succeeded but " 724 "no prefix\n"); 725 error = EINVAL; 726 goto out; 727 } 728 } 729 730 /* relate the address to the prefix */ 731 if (ia->ia6_ndpr == NULL) { 732 ia->ia6_ndpr = pr; 733 pr->ndpr_refcnt++; 734 735 /* 736 * If this is the first autoconf address from the 737 * prefix, create a temporary address as well 738 * (when required). 739 */ 740 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 741 V_ip6_use_tempaddr && pr->ndpr_refcnt == 1) { 742 int e; 743 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 744 log(LOG_NOTICE, "in6_control: failed " 745 "to create a temporary address, " 746 "errno=%d\n", e); 747 } 748 } 749 } 750 751 /* 752 * this might affect the status of autoconfigured addresses, 753 * that is, this address might make other addresses detached. 754 */ 755 pfxlist_onlink_check(); 756 if (error == 0 && ia) { 757 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) { 758 /* 759 * Try to clear the flag when a new 760 * IPv6 address is added onto an 761 * IFDISABLED interface and it 762 * succeeds. 763 */ 764 struct in6_ndireq nd; 765 766 memset(&nd, 0, sizeof(nd)); 767 nd.ndi.flags = ND_IFINFO(ifp)->flags; 768 nd.ndi.flags &= ~ND6_IFF_IFDISABLED; 769 if (nd6_ioctl(SIOCSIFINFO_FLAGS, 770 (caddr_t)&nd, ifp) < 0) 771 log(LOG_NOTICE, "SIOCAIFADDR_IN6: " 772 "SIOCSIFINFO_FLAGS for -ifdisabled " 773 "failed."); 774 /* 775 * Ignore failure of clearing the flag 776 * intentionally. The failure means 777 * address duplication was detected. 778 */ 779 } 780 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 781 } 782 break; 783 } 784 785 case SIOCDIFADDR_IN6: 786 { 787 struct nd_prefix *pr; 788 789 /* 790 * If the address being deleted is the only one that owns 791 * the corresponding prefix, expire the prefix as well. 792 * XXX: theoretically, we don't have to worry about such 793 * relationship, since we separate the address management 794 * and the prefix management. We do this, however, to provide 795 * as much backward compatibility as possible in terms of 796 * the ioctl operation. 797 * Note that in6_purgeaddr() will decrement ndpr_refcnt. 798 */ 799 pr = ia->ia6_ndpr; 800 in6_purgeaddr(&ia->ia_ifa); 801 if (pr && pr->ndpr_refcnt == 0) 802 prelist_remove(pr); 803 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 804 break; 805 } 806 807 default: 808 if (ifp == NULL || ifp->if_ioctl == 0) { 809 error = EOPNOTSUPP; 810 goto out; 811 } 812 error = (*ifp->if_ioctl)(ifp, cmd, data); 813 goto out; 814 } 815 816 error = 0; 817 out: 818 if (ia != NULL) 819 ifa_free(&ia->ia_ifa); 820 return (error); 821 } 822 823 /* 824 * Update parameters of an IPv6 interface address. 825 * If necessary, a new entry is created and linked into address chains. 826 * This function is separated from in6_control(). 827 * XXX: should this be performed under splnet()? 828 */ 829 int 830 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 831 struct in6_ifaddr *ia, int flags) 832 { 833 int error = 0, hostIsNew = 0, plen = -1; 834 struct sockaddr_in6 dst6; 835 struct in6_addrlifetime *lt; 836 struct in6_multi_mship *imm; 837 struct in6_multi *in6m_sol; 838 struct rtentry *rt; 839 int delay; 840 char ip6buf[INET6_ADDRSTRLEN]; 841 842 /* Validate parameters */ 843 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 844 return (EINVAL); 845 846 /* 847 * The destination address for a p2p link must have a family 848 * of AF_UNSPEC or AF_INET6. 849 */ 850 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 851 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 852 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 853 return (EAFNOSUPPORT); 854 /* 855 * validate ifra_prefixmask. don't check sin6_family, netmask 856 * does not carry fields other than sin6_len. 857 */ 858 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 859 return (EINVAL); 860 /* 861 * Because the IPv6 address architecture is classless, we require 862 * users to specify a (non 0) prefix length (mask) for a new address. 863 * We also require the prefix (when specified) mask is valid, and thus 864 * reject a non-consecutive mask. 865 */ 866 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 867 return (EINVAL); 868 if (ifra->ifra_prefixmask.sin6_len != 0) { 869 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 870 (u_char *)&ifra->ifra_prefixmask + 871 ifra->ifra_prefixmask.sin6_len); 872 if (plen <= 0) 873 return (EINVAL); 874 } else { 875 /* 876 * In this case, ia must not be NULL. We just use its prefix 877 * length. 878 */ 879 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 880 } 881 /* 882 * If the destination address on a p2p interface is specified, 883 * and the address is a scoped one, validate/set the scope 884 * zone identifier. 885 */ 886 dst6 = ifra->ifra_dstaddr; 887 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 888 (dst6.sin6_family == AF_INET6)) { 889 struct in6_addr in6_tmp; 890 u_int32_t zoneid; 891 892 in6_tmp = dst6.sin6_addr; 893 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 894 return (EINVAL); /* XXX: should be impossible */ 895 896 if (dst6.sin6_scope_id != 0) { 897 if (dst6.sin6_scope_id != zoneid) 898 return (EINVAL); 899 } else /* user omit to specify the ID. */ 900 dst6.sin6_scope_id = zoneid; 901 902 /* convert into the internal form */ 903 if (sa6_embedscope(&dst6, 0)) 904 return (EINVAL); /* XXX: should be impossible */ 905 } 906 /* 907 * The destination address can be specified only for a p2p or a 908 * loopback interface. If specified, the corresponding prefix length 909 * must be 128. 910 */ 911 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 912 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 913 /* XXX: noisy message */ 914 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 915 "be specified for a p2p or a loopback IF only\n")); 916 return (EINVAL); 917 } 918 if (plen != 128) { 919 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 920 "be 128 when dstaddr is specified\n")); 921 return (EINVAL); 922 } 923 } 924 /* lifetime consistency check */ 925 lt = &ifra->ifra_lifetime; 926 if (lt->ia6t_pltime > lt->ia6t_vltime) 927 return (EINVAL); 928 if (lt->ia6t_vltime == 0) { 929 /* 930 * the following log might be noisy, but this is a typical 931 * configuration mistake or a tool's bug. 932 */ 933 nd6log((LOG_INFO, 934 "in6_update_ifa: valid lifetime is 0 for %s\n", 935 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr))); 936 937 if (ia == NULL) 938 return (0); /* there's nothing to do */ 939 } 940 941 /* 942 * If this is a new address, allocate a new ifaddr and link it 943 * into chains. 944 */ 945 if (ia == NULL) { 946 hostIsNew = 1; 947 /* 948 * When in6_update_ifa() is called in a process of a received 949 * RA, it is called under an interrupt context. So, we should 950 * call malloc with M_NOWAIT. 951 */ 952 ia = (struct in6_ifaddr *) malloc(sizeof(*ia), M_IFADDR, 953 M_NOWAIT); 954 if (ia == NULL) 955 return (ENOBUFS); 956 bzero((caddr_t)ia, sizeof(*ia)); 957 ifa_init(&ia->ia_ifa); 958 LIST_INIT(&ia->ia6_memberships); 959 /* Initialize the address and masks, and put time stamp */ 960 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 961 ia->ia_addr.sin6_family = AF_INET6; 962 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 963 ia->ia6_createtime = time_second; 964 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 965 /* 966 * XXX: some functions expect that ifa_dstaddr is not 967 * NULL for p2p interfaces. 968 */ 969 ia->ia_ifa.ifa_dstaddr = 970 (struct sockaddr *)&ia->ia_dstaddr; 971 } else { 972 ia->ia_ifa.ifa_dstaddr = NULL; 973 } 974 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 975 ia->ia_ifp = ifp; 976 ifa_ref(&ia->ia_ifa); /* if_addrhead */ 977 IF_ADDR_WLOCK(ifp); 978 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 979 IF_ADDR_WUNLOCK(ifp); 980 981 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */ 982 IN6_IFADDR_WLOCK(); 983 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link); 984 IN6_IFADDR_WUNLOCK(); 985 } 986 987 /* update timestamp */ 988 ia->ia6_updatetime = time_second; 989 990 /* set prefix mask */ 991 if (ifra->ifra_prefixmask.sin6_len) { 992 /* 993 * We prohibit changing the prefix length of an existing 994 * address, because 995 * + such an operation should be rare in IPv6, and 996 * + the operation would confuse prefix management. 997 */ 998 if (ia->ia_prefixmask.sin6_len && 999 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 1000 nd6log((LOG_INFO, "in6_update_ifa: the prefix length of an" 1001 " existing (%s) address should not be changed\n", 1002 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1003 error = EINVAL; 1004 goto unlink; 1005 } 1006 ia->ia_prefixmask = ifra->ifra_prefixmask; 1007 } 1008 1009 /* 1010 * If a new destination address is specified, scrub the old one and 1011 * install the new destination. Note that the interface must be 1012 * p2p or loopback (see the check above.) 1013 */ 1014 if (dst6.sin6_family == AF_INET6 && 1015 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1016 int e; 1017 1018 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1019 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) != 0) { 1020 nd6log((LOG_ERR, "in6_update_ifa: failed to remove " 1021 "a route to the old destination: %s\n", 1022 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1023 /* proceed anyway... */ 1024 } else 1025 ia->ia_flags &= ~IFA_ROUTE; 1026 ia->ia_dstaddr = dst6; 1027 } 1028 1029 /* 1030 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1031 * to see if the address is deprecated or invalidated, but initialize 1032 * these members for applications. 1033 */ 1034 ia->ia6_lifetime = ifra->ifra_lifetime; 1035 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1036 ia->ia6_lifetime.ia6t_expire = 1037 time_second + ia->ia6_lifetime.ia6t_vltime; 1038 } else 1039 ia->ia6_lifetime.ia6t_expire = 0; 1040 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1041 ia->ia6_lifetime.ia6t_preferred = 1042 time_second + ia->ia6_lifetime.ia6t_pltime; 1043 } else 1044 ia->ia6_lifetime.ia6t_preferred = 0; 1045 1046 /* reset the interface and routing table appropriately. */ 1047 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 1048 goto unlink; 1049 1050 /* 1051 * configure address flags. 1052 */ 1053 ia->ia6_flags = ifra->ifra_flags; 1054 /* 1055 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1056 * userland, make it deprecated. 1057 */ 1058 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1059 ia->ia6_lifetime.ia6t_pltime = 0; 1060 ia->ia6_lifetime.ia6t_preferred = time_second; 1061 } 1062 /* 1063 * Make the address tentative before joining multicast addresses, 1064 * so that corresponding MLD responses would not have a tentative 1065 * source address. 1066 */ 1067 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1068 if (hostIsNew && in6if_do_dad(ifp)) 1069 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1070 1071 /* DAD should be performed after ND6_IFF_IFDISABLED is cleared. */ 1072 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1073 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1074 1075 /* 1076 * We are done if we have simply modified an existing address. 1077 */ 1078 if (!hostIsNew) 1079 return (error); 1080 1081 /* 1082 * Beyond this point, we should call in6_purgeaddr upon an error, 1083 * not just go to unlink. 1084 */ 1085 1086 /* Join necessary multicast groups */ 1087 in6m_sol = NULL; 1088 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1089 struct sockaddr_in6 mltaddr, mltmask; 1090 struct in6_addr llsol; 1091 1092 /* join solicited multicast addr for new host id */ 1093 bzero(&llsol, sizeof(struct in6_addr)); 1094 llsol.s6_addr32[0] = IPV6_ADDR_INT32_MLL; 1095 llsol.s6_addr32[1] = 0; 1096 llsol.s6_addr32[2] = htonl(1); 1097 llsol.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 1098 llsol.s6_addr8[12] = 0xff; 1099 if ((error = in6_setscope(&llsol, ifp, NULL)) != 0) { 1100 /* XXX: should not happen */ 1101 log(LOG_ERR, "in6_update_ifa: " 1102 "in6_setscope failed\n"); 1103 goto cleanup; 1104 } 1105 delay = 0; 1106 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1107 /* 1108 * We need a random delay for DAD on the address 1109 * being configured. It also means delaying 1110 * transmission of the corresponding MLD report to 1111 * avoid report collision. 1112 * [RFC 4861, Section 6.3.7] 1113 */ 1114 delay = arc4random() % 1115 (MAX_RTR_SOLICITATION_DELAY * hz); 1116 } 1117 imm = in6_joingroup(ifp, &llsol, &error, delay); 1118 if (imm == NULL) { 1119 nd6log((LOG_WARNING, 1120 "in6_update_ifa: addmulti failed for " 1121 "%s on %s (errno=%d)\n", 1122 ip6_sprintf(ip6buf, &llsol), if_name(ifp), 1123 error)); 1124 goto cleanup; 1125 } 1126 LIST_INSERT_HEAD(&ia->ia6_memberships, 1127 imm, i6mm_chain); 1128 in6m_sol = imm->i6mm_maddr; 1129 1130 bzero(&mltmask, sizeof(mltmask)); 1131 mltmask.sin6_len = sizeof(struct sockaddr_in6); 1132 mltmask.sin6_family = AF_INET6; 1133 mltmask.sin6_addr = in6mask32; 1134 #define MLTMASK_LEN 4 /* mltmask's masklen (=32bit=4octet) */ 1135 1136 /* 1137 * join link-local all-nodes address 1138 */ 1139 bzero(&mltaddr, sizeof(mltaddr)); 1140 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 1141 mltaddr.sin6_family = AF_INET6; 1142 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 1143 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 1144 0) 1145 goto cleanup; /* XXX: should not fail */ 1146 1147 /* 1148 * XXX: do we really need this automatic routes? 1149 * We should probably reconsider this stuff. Most applications 1150 * actually do not need the routes, since they usually specify 1151 * the outgoing interface. 1152 */ 1153 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL); 1154 if (rt) { 1155 /* XXX: only works in !SCOPEDROUTING case. */ 1156 if (memcmp(&mltaddr.sin6_addr, 1157 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, 1158 MLTMASK_LEN)) { 1159 RTFREE_LOCKED(rt); 1160 rt = NULL; 1161 } 1162 } 1163 if (!rt) { 1164 error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr, 1165 (struct sockaddr *)&ia->ia_addr, 1166 (struct sockaddr *)&mltmask, RTF_UP, 1167 (struct rtentry **)0); 1168 if (error) 1169 goto cleanup; 1170 } else { 1171 RTFREE_LOCKED(rt); 1172 } 1173 1174 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1175 if (!imm) { 1176 nd6log((LOG_WARNING, 1177 "in6_update_ifa: addmulti failed for " 1178 "%s on %s (errno=%d)\n", 1179 ip6_sprintf(ip6buf, &mltaddr.sin6_addr), 1180 if_name(ifp), error)); 1181 goto cleanup; 1182 } 1183 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1184 1185 /* 1186 * join node information group address 1187 */ 1188 delay = 0; 1189 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1190 /* 1191 * The spec doesn't say anything about delay for this 1192 * group, but the same logic should apply. 1193 */ 1194 delay = arc4random() % 1195 (MAX_RTR_SOLICITATION_DELAY * hz); 1196 } 1197 if (in6_nigroup(ifp, NULL, -1, &mltaddr.sin6_addr) == 0) { 1198 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 1199 delay); /* XXX jinmei */ 1200 if (!imm) { 1201 nd6log((LOG_WARNING, "in6_update_ifa: " 1202 "addmulti failed for %s on %s " 1203 "(errno=%d)\n", 1204 ip6_sprintf(ip6buf, &mltaddr.sin6_addr), 1205 if_name(ifp), error)); 1206 /* XXX not very fatal, go on... */ 1207 } else { 1208 LIST_INSERT_HEAD(&ia->ia6_memberships, 1209 imm, i6mm_chain); 1210 } 1211 } 1212 1213 /* 1214 * join interface-local all-nodes address. 1215 * (ff01::1%ifN, and ff01::%ifN/32) 1216 */ 1217 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1218 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) 1219 != 0) 1220 goto cleanup; /* XXX: should not fail */ 1221 /* XXX: again, do we really need the route? */ 1222 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL); 1223 if (rt) { 1224 if (memcmp(&mltaddr.sin6_addr, 1225 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, 1226 MLTMASK_LEN)) { 1227 RTFREE_LOCKED(rt); 1228 rt = NULL; 1229 } 1230 } 1231 if (!rt) { 1232 error = rtrequest(RTM_ADD, (struct sockaddr *)&mltaddr, 1233 (struct sockaddr *)&ia->ia_addr, 1234 (struct sockaddr *)&mltmask, RTF_UP, 1235 (struct rtentry **)0); 1236 if (error) 1237 goto cleanup; 1238 } else 1239 RTFREE_LOCKED(rt); 1240 1241 imm = in6_joingroup(ifp, &mltaddr.sin6_addr, &error, 0); 1242 if (!imm) { 1243 nd6log((LOG_WARNING, "in6_update_ifa: " 1244 "addmulti failed for %s on %s " 1245 "(errno=%d)\n", 1246 ip6_sprintf(ip6buf, &mltaddr.sin6_addr), 1247 if_name(ifp), error)); 1248 goto cleanup; 1249 } 1250 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 1251 #undef MLTMASK_LEN 1252 } 1253 1254 /* 1255 * Perform DAD, if needed. 1256 * XXX It may be of use, if we can administratively 1257 * disable DAD. 1258 */ 1259 if (in6if_do_dad(ifp) && ((ifra->ifra_flags & IN6_IFF_NODAD) == 0) && 1260 (ia->ia6_flags & IN6_IFF_TENTATIVE)) 1261 { 1262 int mindelay, maxdelay; 1263 1264 delay = 0; 1265 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1266 /* 1267 * We need to impose a delay before sending an NS 1268 * for DAD. Check if we also needed a delay for the 1269 * corresponding MLD message. If we did, the delay 1270 * should be larger than the MLD delay (this could be 1271 * relaxed a bit, but this simple logic is at least 1272 * safe). 1273 * XXX: Break data hiding guidelines and look at 1274 * state for the solicited multicast group. 1275 */ 1276 mindelay = 0; 1277 if (in6m_sol != NULL && 1278 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) { 1279 mindelay = in6m_sol->in6m_timer; 1280 } 1281 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1282 if (maxdelay - mindelay == 0) 1283 delay = 0; 1284 else { 1285 delay = 1286 (arc4random() % (maxdelay - mindelay)) + 1287 mindelay; 1288 } 1289 } 1290 nd6_dad_start((struct ifaddr *)ia, delay); 1291 } 1292 1293 KASSERT(hostIsNew, ("in6_update_ifa: !hostIsNew")); 1294 ifa_free(&ia->ia_ifa); 1295 return (error); 1296 1297 unlink: 1298 /* 1299 * XXX: if a change of an existing address failed, keep the entry 1300 * anyway. 1301 */ 1302 if (hostIsNew) { 1303 in6_unlink_ifa(ia, ifp); 1304 ifa_free(&ia->ia_ifa); 1305 } 1306 return (error); 1307 1308 cleanup: 1309 KASSERT(hostIsNew, ("in6_update_ifa: cleanup: !hostIsNew")); 1310 ifa_free(&ia->ia_ifa); 1311 in6_purgeaddr(&ia->ia_ifa); 1312 return error; 1313 } 1314 1315 void 1316 in6_purgeaddr(struct ifaddr *ifa) 1317 { 1318 struct ifnet *ifp = ifa->ifa_ifp; 1319 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1320 struct in6_multi_mship *imm; 1321 struct sockaddr_in6 mltaddr, mltmask; 1322 int plen, error; 1323 struct rtentry *rt; 1324 struct ifaddr *ifa0; 1325 1326 if (ifa->ifa_carp) 1327 (*carp_detach_p)(ifa); 1328 1329 /* 1330 * find another IPv6 address as the gateway for the 1331 * link-local and node-local all-nodes multicast 1332 * address routes 1333 */ 1334 IF_ADDR_RLOCK(ifp); 1335 TAILQ_FOREACH(ifa0, &ifp->if_addrhead, ifa_link) { 1336 if ((ifa0->ifa_addr->sa_family != AF_INET6) || 1337 memcmp(&satosin6(ifa0->ifa_addr)->sin6_addr, 1338 &ia->ia_addr.sin6_addr, 1339 sizeof(struct in6_addr)) == 0) 1340 continue; 1341 else 1342 break; 1343 } 1344 if (ifa0 != NULL) 1345 ifa_ref(ifa0); 1346 IF_ADDR_RUNLOCK(ifp); 1347 1348 /* 1349 * Remove the loopback route to the interface address. 1350 * The check for the current setting of "nd6_useloopback" 1351 * is not needed. 1352 */ 1353 if (ia->ia_flags & IFA_RTSELF) { 1354 error = ifa_del_loopback_route((struct ifaddr *)ia, 1355 (struct sockaddr *)&ia->ia_addr); 1356 if (error == 0) 1357 ia->ia_flags &= ~IFA_RTSELF; 1358 } 1359 1360 /* stop DAD processing */ 1361 nd6_dad_stop(ifa); 1362 1363 in6_ifremloop(ifa); 1364 1365 /* 1366 * leave from multicast groups we have joined for the interface 1367 */ 1368 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1369 LIST_REMOVE(imm, i6mm_chain); 1370 in6_leavegroup(imm); 1371 } 1372 1373 /* 1374 * remove the link-local all-nodes address 1375 */ 1376 bzero(&mltmask, sizeof(mltmask)); 1377 mltmask.sin6_len = sizeof(struct sockaddr_in6); 1378 mltmask.sin6_family = AF_INET6; 1379 mltmask.sin6_addr = in6mask32; 1380 1381 bzero(&mltaddr, sizeof(mltaddr)); 1382 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 1383 mltaddr.sin6_family = AF_INET6; 1384 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 1385 1386 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) 1387 goto cleanup; 1388 1389 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL); 1390 if (rt != NULL && rt->rt_gateway != NULL && 1391 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 1392 &ia->ia_addr.sin6_addr, 1393 sizeof(ia->ia_addr.sin6_addr)) == 0)) { 1394 /* 1395 * if no more IPv6 address exists on this interface 1396 * then remove the multicast address route 1397 */ 1398 if (ifa0 == NULL) { 1399 memcpy(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr, 1400 sizeof(mltaddr.sin6_addr)); 1401 RTFREE_LOCKED(rt); 1402 error = rtrequest(RTM_DELETE, (struct sockaddr *)&mltaddr, 1403 (struct sockaddr *)&ia->ia_addr, 1404 (struct sockaddr *)&mltmask, RTF_UP, 1405 (struct rtentry **)0); 1406 if (error) 1407 log(LOG_INFO, "in6_purgeaddr: link-local all-nodes" 1408 "multicast address deletion error\n"); 1409 } else { 1410 /* 1411 * replace the gateway of the route 1412 */ 1413 struct sockaddr_in6 sa; 1414 1415 bzero(&sa, sizeof(sa)); 1416 sa.sin6_len = sizeof(struct sockaddr_in6); 1417 sa.sin6_family = AF_INET6; 1418 memcpy(&sa.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, 1419 sizeof(sa.sin6_addr)); 1420 in6_setscope(&sa.sin6_addr, ifa0->ifa_ifp, NULL); 1421 memcpy(rt->rt_gateway, &sa, sizeof(sa)); 1422 RTFREE_LOCKED(rt); 1423 } 1424 } else { 1425 if (rt != NULL) 1426 RTFREE_LOCKED(rt); 1427 } 1428 1429 /* 1430 * remove the node-local all-nodes address 1431 */ 1432 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 1433 if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 1434 0) 1435 goto cleanup; 1436 1437 rt = rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL); 1438 if (rt != NULL && rt->rt_gateway != NULL && 1439 (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, 1440 &ia->ia_addr.sin6_addr, 1441 sizeof(ia->ia_addr.sin6_addr)) == 0)) { 1442 /* 1443 * if no more IPv6 address exists on this interface 1444 * then remove the multicast address route 1445 */ 1446 if (ifa0 == NULL) { 1447 memcpy(&mltaddr.sin6_addr, &satosin6(rt_key(rt))->sin6_addr, 1448 sizeof(mltaddr.sin6_addr)); 1449 1450 RTFREE_LOCKED(rt); 1451 error = rtrequest(RTM_DELETE, (struct sockaddr *)&mltaddr, 1452 (struct sockaddr *)&ia->ia_addr, 1453 (struct sockaddr *)&mltmask, RTF_UP, 1454 (struct rtentry **)0); 1455 1456 if (error) 1457 log(LOG_INFO, "in6_purgeaddr: node-local all-nodes" 1458 "multicast address deletion error\n"); 1459 } else { 1460 /* 1461 * replace the gateway of the route 1462 */ 1463 struct sockaddr_in6 sa; 1464 1465 bzero(&sa, sizeof(sa)); 1466 sa.sin6_len = sizeof(struct sockaddr_in6); 1467 sa.sin6_family = AF_INET6; 1468 memcpy(&sa.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, 1469 sizeof(sa.sin6_addr)); 1470 in6_setscope(&sa.sin6_addr, ifa0->ifa_ifp, NULL); 1471 memcpy(rt->rt_gateway, &sa, sizeof(sa)); 1472 RTFREE_LOCKED(rt); 1473 } 1474 } else { 1475 if (rt != NULL) 1476 RTFREE_LOCKED(rt); 1477 } 1478 1479 cleanup: 1480 if (ifa0 != NULL) 1481 ifa_free(ifa0); 1482 1483 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1484 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) { 1485 int error; 1486 struct sockaddr *dstaddr; 1487 1488 /* 1489 * use the interface address if configuring an 1490 * interface address with a /128 prefix len 1491 */ 1492 if (ia->ia_dstaddr.sin6_family == AF_INET6) 1493 dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 1494 else 1495 dstaddr = (struct sockaddr *)&ia->ia_addr; 1496 1497 error = rtrequest(RTM_DELETE, 1498 (struct sockaddr *)dstaddr, 1499 (struct sockaddr *)&ia->ia_addr, 1500 (struct sockaddr *)&ia->ia_prefixmask, 1501 ia->ia_flags | RTF_HOST, NULL); 1502 if (error != 0) 1503 return; 1504 ia->ia_flags &= ~IFA_ROUTE; 1505 } 1506 1507 in6_unlink_ifa(ia, ifp); 1508 } 1509 1510 static void 1511 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1512 { 1513 int s = splnet(); 1514 1515 IF_ADDR_WLOCK(ifp); 1516 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1517 IF_ADDR_WUNLOCK(ifp); 1518 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1519 1520 /* 1521 * Defer the release of what might be the last reference to the 1522 * in6_ifaddr so that it can't be freed before the remainder of the 1523 * cleanup. 1524 */ 1525 IN6_IFADDR_WLOCK(); 1526 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 1527 IN6_IFADDR_WUNLOCK(); 1528 1529 /* 1530 * Release the reference to the base prefix. There should be a 1531 * positive reference. 1532 */ 1533 if (ia->ia6_ndpr == NULL) { 1534 nd6log((LOG_NOTICE, 1535 "in6_unlink_ifa: autoconf'ed address " 1536 "%p has no prefix\n", ia)); 1537 } else { 1538 ia->ia6_ndpr->ndpr_refcnt--; 1539 ia->ia6_ndpr = NULL; 1540 } 1541 1542 /* 1543 * Also, if the address being removed is autoconf'ed, call 1544 * pfxlist_onlink_check() since the release might affect the status of 1545 * other (detached) addresses. 1546 */ 1547 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1548 pfxlist_onlink_check(); 1549 } 1550 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1551 splx(s); 1552 } 1553 1554 void 1555 in6_purgeif(struct ifnet *ifp) 1556 { 1557 struct ifaddr *ifa, *nifa; 1558 1559 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) { 1560 if (ifa->ifa_addr->sa_family != AF_INET6) 1561 continue; 1562 in6_purgeaddr(ifa); 1563 } 1564 1565 in6_ifdetach(ifp); 1566 } 1567 1568 /* 1569 * SIOC[GAD]LIFADDR. 1570 * SIOCGLIFADDR: get first address. (?) 1571 * SIOCGLIFADDR with IFLR_PREFIX: 1572 * get first address that matches the specified prefix. 1573 * SIOCALIFADDR: add the specified address. 1574 * SIOCALIFADDR with IFLR_PREFIX: 1575 * add the specified prefix, filling hostid part from 1576 * the first link-local address. prefixlen must be <= 64. 1577 * SIOCDLIFADDR: delete the specified address. 1578 * SIOCDLIFADDR with IFLR_PREFIX: 1579 * delete the first address that matches the specified prefix. 1580 * return values: 1581 * EINVAL on invalid parameters 1582 * EADDRNOTAVAIL on prefix match failed/specified address not found 1583 * other values may be returned from in6_ioctl() 1584 * 1585 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1586 * this is to accomodate address naming scheme other than RFC2374, 1587 * in the future. 1588 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1589 * address encoding scheme. (see figure on page 8) 1590 */ 1591 static int 1592 in6_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, 1593 struct ifnet *ifp, struct thread *td) 1594 { 1595 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1596 struct ifaddr *ifa; 1597 struct sockaddr *sa; 1598 1599 /* sanity checks */ 1600 if (!data || !ifp) { 1601 panic("invalid argument to in6_lifaddr_ioctl"); 1602 /* NOTREACHED */ 1603 } 1604 1605 switch (cmd) { 1606 case SIOCGLIFADDR: 1607 /* address must be specified on GET with IFLR_PREFIX */ 1608 if ((iflr->flags & IFLR_PREFIX) == 0) 1609 break; 1610 /* FALLTHROUGH */ 1611 case SIOCALIFADDR: 1612 case SIOCDLIFADDR: 1613 /* address must be specified on ADD and DELETE */ 1614 sa = (struct sockaddr *)&iflr->addr; 1615 if (sa->sa_family != AF_INET6) 1616 return EINVAL; 1617 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1618 return EINVAL; 1619 /* XXX need improvement */ 1620 sa = (struct sockaddr *)&iflr->dstaddr; 1621 if (sa->sa_family && sa->sa_family != AF_INET6) 1622 return EINVAL; 1623 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1624 return EINVAL; 1625 break; 1626 default: /* shouldn't happen */ 1627 #if 0 1628 panic("invalid cmd to in6_lifaddr_ioctl"); 1629 /* NOTREACHED */ 1630 #else 1631 return EOPNOTSUPP; 1632 #endif 1633 } 1634 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) 1635 return EINVAL; 1636 1637 switch (cmd) { 1638 case SIOCALIFADDR: 1639 { 1640 struct in6_aliasreq ifra; 1641 struct in6_addr *hostid = NULL; 1642 int prefixlen; 1643 1644 ifa = NULL; 1645 if ((iflr->flags & IFLR_PREFIX) != 0) { 1646 struct sockaddr_in6 *sin6; 1647 1648 /* 1649 * hostid is to fill in the hostid part of the 1650 * address. hostid points to the first link-local 1651 * address attached to the interface. 1652 */ 1653 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1654 if (!ifa) 1655 return EADDRNOTAVAIL; 1656 hostid = IFA_IN6(ifa); 1657 1658 /* prefixlen must be <= 64. */ 1659 if (64 < iflr->prefixlen) 1660 return EINVAL; 1661 prefixlen = iflr->prefixlen; 1662 1663 /* hostid part must be zero. */ 1664 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1665 if (sin6->sin6_addr.s6_addr32[2] != 0 || 1666 sin6->sin6_addr.s6_addr32[3] != 0) { 1667 return EINVAL; 1668 } 1669 } else 1670 prefixlen = iflr->prefixlen; 1671 1672 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1673 bzero(&ifra, sizeof(ifra)); 1674 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof(ifra.ifra_name)); 1675 1676 bcopy(&iflr->addr, &ifra.ifra_addr, 1677 ((struct sockaddr *)&iflr->addr)->sa_len); 1678 if (hostid) { 1679 /* fill in hostid part */ 1680 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1681 hostid->s6_addr32[2]; 1682 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1683 hostid->s6_addr32[3]; 1684 } 1685 1686 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /* XXX */ 1687 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1688 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1689 if (hostid) { 1690 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1691 hostid->s6_addr32[2]; 1692 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1693 hostid->s6_addr32[3]; 1694 } 1695 } 1696 if (ifa != NULL) 1697 ifa_free(ifa); 1698 1699 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1700 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1701 1702 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1703 return in6_control(so, SIOCAIFADDR_IN6, (caddr_t)&ifra, ifp, td); 1704 } 1705 case SIOCGLIFADDR: 1706 case SIOCDLIFADDR: 1707 { 1708 struct in6_ifaddr *ia; 1709 struct in6_addr mask, candidate, match; 1710 struct sockaddr_in6 *sin6; 1711 int cmp; 1712 1713 bzero(&mask, sizeof(mask)); 1714 if (iflr->flags & IFLR_PREFIX) { 1715 /* lookup a prefix rather than address. */ 1716 in6_prefixlen2mask(&mask, iflr->prefixlen); 1717 1718 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1719 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1720 match.s6_addr32[0] &= mask.s6_addr32[0]; 1721 match.s6_addr32[1] &= mask.s6_addr32[1]; 1722 match.s6_addr32[2] &= mask.s6_addr32[2]; 1723 match.s6_addr32[3] &= mask.s6_addr32[3]; 1724 1725 /* if you set extra bits, that's wrong */ 1726 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1727 return EINVAL; 1728 1729 cmp = 1; 1730 } else { 1731 if (cmd == SIOCGLIFADDR) { 1732 /* on getting an address, take the 1st match */ 1733 cmp = 0; /* XXX */ 1734 } else { 1735 /* on deleting an address, do exact match */ 1736 in6_prefixlen2mask(&mask, 128); 1737 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1738 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1739 1740 cmp = 1; 1741 } 1742 } 1743 1744 IF_ADDR_RLOCK(ifp); 1745 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1746 if (ifa->ifa_addr->sa_family != AF_INET6) 1747 continue; 1748 if (!cmp) 1749 break; 1750 1751 /* 1752 * XXX: this is adhoc, but is necessary to allow 1753 * a user to specify fe80::/64 (not /10) for a 1754 * link-local address. 1755 */ 1756 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1757 in6_clearscope(&candidate); 1758 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1759 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1760 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1761 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1762 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1763 break; 1764 } 1765 if (ifa != NULL) 1766 ifa_ref(ifa); 1767 IF_ADDR_RUNLOCK(ifp); 1768 if (!ifa) 1769 return EADDRNOTAVAIL; 1770 ia = ifa2ia6(ifa); 1771 1772 if (cmd == SIOCGLIFADDR) { 1773 int error; 1774 1775 /* fill in the if_laddrreq structure */ 1776 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1777 error = sa6_recoverscope( 1778 (struct sockaddr_in6 *)&iflr->addr); 1779 if (error != 0) { 1780 ifa_free(ifa); 1781 return (error); 1782 } 1783 1784 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1785 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1786 ia->ia_dstaddr.sin6_len); 1787 error = sa6_recoverscope( 1788 (struct sockaddr_in6 *)&iflr->dstaddr); 1789 if (error != 0) { 1790 ifa_free(ifa); 1791 return (error); 1792 } 1793 } else 1794 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1795 1796 iflr->prefixlen = 1797 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 1798 1799 iflr->flags = ia->ia6_flags; /* XXX */ 1800 ifa_free(ifa); 1801 1802 return 0; 1803 } else { 1804 struct in6_aliasreq ifra; 1805 1806 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1807 bzero(&ifra, sizeof(ifra)); 1808 bcopy(iflr->iflr_name, ifra.ifra_name, 1809 sizeof(ifra.ifra_name)); 1810 1811 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1812 ia->ia_addr.sin6_len); 1813 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) { 1814 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1815 ia->ia_dstaddr.sin6_len); 1816 } else { 1817 bzero(&ifra.ifra_dstaddr, 1818 sizeof(ifra.ifra_dstaddr)); 1819 } 1820 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1821 ia->ia_prefixmask.sin6_len); 1822 1823 ifra.ifra_flags = ia->ia6_flags; 1824 ifa_free(ifa); 1825 return in6_control(so, SIOCDIFADDR_IN6, (caddr_t)&ifra, 1826 ifp, td); 1827 } 1828 } 1829 } 1830 1831 return EOPNOTSUPP; /* just for safety */ 1832 } 1833 1834 /* 1835 * Initialize an interface's intetnet6 address 1836 * and routing table entry. 1837 */ 1838 static int 1839 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, 1840 struct sockaddr_in6 *sin6, int newhost) 1841 { 1842 int error = 0, plen, ifacount = 0; 1843 int s = splimp(); 1844 struct ifaddr *ifa; 1845 1846 /* 1847 * Give the interface a chance to initialize 1848 * if this is its first address, 1849 * and to validate the address if necessary. 1850 */ 1851 IF_ADDR_RLOCK(ifp); 1852 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1853 if (ifa->ifa_addr->sa_family != AF_INET6) 1854 continue; 1855 ifacount++; 1856 } 1857 IF_ADDR_RUNLOCK(ifp); 1858 1859 ia->ia_addr = *sin6; 1860 1861 if (ifacount <= 1 && ifp->if_ioctl) { 1862 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1863 if (error) { 1864 splx(s); 1865 return (error); 1866 } 1867 } 1868 splx(s); 1869 1870 ia->ia_ifa.ifa_metric = ifp->if_metric; 1871 1872 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1873 1874 /* 1875 * Special case: 1876 * If a new destination address is specified for a point-to-point 1877 * interface, install a route to the destination as an interface 1878 * direct route. 1879 * XXX: the logic below rejects assigning multiple addresses on a p2p 1880 * interface that share the same destination. 1881 */ 1882 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1883 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 && 1884 ia->ia_dstaddr.sin6_family == AF_INET6) { 1885 int rtflags = RTF_UP | RTF_HOST; 1886 1887 error = rtrequest(RTM_ADD, 1888 (struct sockaddr *)&ia->ia_dstaddr, 1889 (struct sockaddr *)&ia->ia_addr, 1890 (struct sockaddr *)&ia->ia_prefixmask, 1891 ia->ia_flags | rtflags, NULL); 1892 if (error != 0) 1893 return (error); 1894 ia->ia_flags |= IFA_ROUTE; 1895 /* 1896 * Handle the case for ::1 . 1897 */ 1898 if (ifp->if_flags & IFF_LOOPBACK) 1899 ia->ia_flags |= IFA_RTSELF; 1900 } 1901 1902 /* 1903 * add a loopback route to self 1904 */ 1905 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) { 1906 error = ifa_add_loopback_route((struct ifaddr *)ia, 1907 (struct sockaddr *)&ia->ia_addr); 1908 if (error == 0) 1909 ia->ia_flags |= IFA_RTSELF; 1910 } 1911 1912 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1913 if (newhost) 1914 in6_ifaddloop(&(ia->ia_ifa)); 1915 1916 return (error); 1917 } 1918 1919 /* 1920 * Find an IPv6 interface link-local address specific to an interface. 1921 * ifaddr is returned referenced. 1922 */ 1923 struct in6_ifaddr * 1924 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1925 { 1926 struct ifaddr *ifa; 1927 1928 IF_ADDR_RLOCK(ifp); 1929 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1930 if (ifa->ifa_addr->sa_family != AF_INET6) 1931 continue; 1932 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1933 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1934 ignoreflags) != 0) 1935 continue; 1936 ifa_ref(ifa); 1937 break; 1938 } 1939 } 1940 IF_ADDR_RUNLOCK(ifp); 1941 1942 return ((struct in6_ifaddr *)ifa); 1943 } 1944 1945 1946 /* 1947 * find the internet address corresponding to a given interface and address. 1948 * ifaddr is returned referenced. 1949 */ 1950 struct in6_ifaddr * 1951 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr) 1952 { 1953 struct ifaddr *ifa; 1954 1955 IF_ADDR_RLOCK(ifp); 1956 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1957 if (ifa->ifa_addr->sa_family != AF_INET6) 1958 continue; 1959 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1960 ifa_ref(ifa); 1961 break; 1962 } 1963 } 1964 IF_ADDR_RUNLOCK(ifp); 1965 1966 return ((struct in6_ifaddr *)ifa); 1967 } 1968 1969 /* 1970 * Convert IP6 address to printable (loggable) representation. Caller 1971 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 1972 */ 1973 static char digits[] = "0123456789abcdef"; 1974 char * 1975 ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 1976 { 1977 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0; 1978 char *cp; 1979 const u_int16_t *a = (const u_int16_t *)addr; 1980 const u_int8_t *d; 1981 int dcolon = 0, zero = 0; 1982 1983 cp = ip6buf; 1984 1985 for (i = 0; i < 8; i++) { 1986 if (*(a + i) == 0) { 1987 cnt++; 1988 if (cnt == 1) 1989 idx = i; 1990 } 1991 else if (maxcnt < cnt) { 1992 maxcnt = cnt; 1993 index = idx; 1994 cnt = 0; 1995 } 1996 } 1997 if (maxcnt < cnt) { 1998 maxcnt = cnt; 1999 index = idx; 2000 } 2001 2002 for (i = 0; i < 8; i++) { 2003 if (dcolon == 1) { 2004 if (*a == 0) { 2005 if (i == 7) 2006 *cp++ = ':'; 2007 a++; 2008 continue; 2009 } else 2010 dcolon = 2; 2011 } 2012 if (*a == 0) { 2013 if (dcolon == 0 && *(a + 1) == 0 && i == index) { 2014 if (i == 0) 2015 *cp++ = ':'; 2016 *cp++ = ':'; 2017 dcolon = 1; 2018 } else { 2019 *cp++ = '0'; 2020 *cp++ = ':'; 2021 } 2022 a++; 2023 continue; 2024 } 2025 d = (const u_char *)a; 2026 /* Try to eliminate leading zeros in printout like in :0001. */ 2027 zero = 1; 2028 *cp = digits[*d >> 4]; 2029 if (*cp != '0') { 2030 zero = 0; 2031 cp++; 2032 } 2033 *cp = digits[*d++ & 0xf]; 2034 if (zero == 0 || (*cp != '0')) { 2035 zero = 0; 2036 cp++; 2037 } 2038 *cp = digits[*d >> 4]; 2039 if (zero == 0 || (*cp != '0')) { 2040 zero = 0; 2041 cp++; 2042 } 2043 *cp++ = digits[*d & 0xf]; 2044 *cp++ = ':'; 2045 a++; 2046 } 2047 *--cp = '\0'; 2048 return (ip6buf); 2049 } 2050 2051 int 2052 in6_localaddr(struct in6_addr *in6) 2053 { 2054 struct in6_ifaddr *ia; 2055 2056 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 2057 return 1; 2058 2059 IN6_IFADDR_RLOCK(); 2060 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 2061 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 2062 &ia->ia_prefixmask.sin6_addr)) { 2063 IN6_IFADDR_RUNLOCK(); 2064 return 1; 2065 } 2066 } 2067 IN6_IFADDR_RUNLOCK(); 2068 2069 return (0); 2070 } 2071 2072 /* 2073 * Return 1 if an internet address is for the local host and configured 2074 * on one of its interfaces. 2075 */ 2076 int 2077 in6_localip(struct in6_addr *in6) 2078 { 2079 struct in6_ifaddr *ia; 2080 2081 IN6_IFADDR_RLOCK(); 2082 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 2083 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) { 2084 IN6_IFADDR_RUNLOCK(); 2085 return (1); 2086 } 2087 } 2088 IN6_IFADDR_RUNLOCK(); 2089 return (0); 2090 } 2091 2092 2093 int 2094 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 2095 { 2096 struct in6_ifaddr *ia; 2097 2098 IN6_IFADDR_RLOCK(); 2099 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 2100 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 2101 &sa6->sin6_addr) && 2102 (ia->ia6_flags & IN6_IFF_DEPRECATED) != 0) { 2103 IN6_IFADDR_RUNLOCK(); 2104 return (1); /* true */ 2105 } 2106 2107 /* XXX: do we still have to go thru the rest of the list? */ 2108 } 2109 IN6_IFADDR_RUNLOCK(); 2110 2111 return (0); /* false */ 2112 } 2113 2114 /* 2115 * return length of part which dst and src are equal 2116 * hard coding... 2117 */ 2118 int 2119 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 2120 { 2121 int match = 0; 2122 u_char *s = (u_char *)src, *d = (u_char *)dst; 2123 u_char *lim = s + 16, r; 2124 2125 while (s < lim) 2126 if ((r = (*d++ ^ *s++)) != 0) { 2127 while (r < 128) { 2128 match++; 2129 r <<= 1; 2130 } 2131 break; 2132 } else 2133 match += 8; 2134 return match; 2135 } 2136 2137 /* XXX: to be scope conscious */ 2138 int 2139 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 2140 { 2141 int bytelen, bitlen; 2142 2143 /* sanity check */ 2144 if (0 > len || len > 128) { 2145 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 2146 len); 2147 return (0); 2148 } 2149 2150 bytelen = len / 8; 2151 bitlen = len % 8; 2152 2153 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 2154 return (0); 2155 if (bitlen != 0 && 2156 p1->s6_addr[bytelen] >> (8 - bitlen) != 2157 p2->s6_addr[bytelen] >> (8 - bitlen)) 2158 return (0); 2159 2160 return (1); 2161 } 2162 2163 void 2164 in6_prefixlen2mask(struct in6_addr *maskp, int len) 2165 { 2166 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 2167 int bytelen, bitlen, i; 2168 2169 /* sanity check */ 2170 if (0 > len || len > 128) { 2171 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 2172 len); 2173 return; 2174 } 2175 2176 bzero(maskp, sizeof(*maskp)); 2177 bytelen = len / 8; 2178 bitlen = len % 8; 2179 for (i = 0; i < bytelen; i++) 2180 maskp->s6_addr[i] = 0xff; 2181 if (bitlen) 2182 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 2183 } 2184 2185 /* 2186 * return the best address out of the same scope. if no address was 2187 * found, return the first valid address from designated IF. 2188 */ 2189 struct in6_ifaddr * 2190 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2191 { 2192 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2193 struct ifaddr *ifa; 2194 struct in6_ifaddr *besta = 0; 2195 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2196 2197 dep[0] = dep[1] = NULL; 2198 2199 /* 2200 * We first look for addresses in the same scope. 2201 * If there is one, return it. 2202 * If two or more, return one which matches the dst longest. 2203 * If none, return one of global addresses assigned other ifs. 2204 */ 2205 IF_ADDR_RLOCK(ifp); 2206 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2207 if (ifa->ifa_addr->sa_family != AF_INET6) 2208 continue; 2209 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2210 continue; /* XXX: is there any case to allow anycast? */ 2211 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2212 continue; /* don't use this interface */ 2213 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2214 continue; 2215 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2216 if (V_ip6_use_deprecated) 2217 dep[0] = (struct in6_ifaddr *)ifa; 2218 continue; 2219 } 2220 2221 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2222 /* 2223 * call in6_matchlen() as few as possible 2224 */ 2225 if (besta) { 2226 if (blen == -1) 2227 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2228 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2229 if (tlen > blen) { 2230 blen = tlen; 2231 besta = (struct in6_ifaddr *)ifa; 2232 } 2233 } else 2234 besta = (struct in6_ifaddr *)ifa; 2235 } 2236 } 2237 if (besta) { 2238 ifa_ref(&besta->ia_ifa); 2239 IF_ADDR_RUNLOCK(ifp); 2240 return (besta); 2241 } 2242 2243 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2244 if (ifa->ifa_addr->sa_family != AF_INET6) 2245 continue; 2246 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2247 continue; /* XXX: is there any case to allow anycast? */ 2248 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2249 continue; /* don't use this interface */ 2250 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2251 continue; 2252 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2253 if (V_ip6_use_deprecated) 2254 dep[1] = (struct in6_ifaddr *)ifa; 2255 continue; 2256 } 2257 2258 if (ifa != NULL) 2259 ifa_ref(ifa); 2260 IF_ADDR_RUNLOCK(ifp); 2261 return (struct in6_ifaddr *)ifa; 2262 } 2263 IF_ADDR_RUNLOCK(ifp); 2264 2265 /* use the last-resort values, that are, deprecated addresses */ 2266 if (dep[0]) 2267 return dep[0]; 2268 if (dep[1]) 2269 return dep[1]; 2270 2271 return NULL; 2272 } 2273 2274 /* 2275 * perform DAD when interface becomes IFF_UP. 2276 */ 2277 void 2278 in6_if_up(struct ifnet *ifp) 2279 { 2280 struct ifaddr *ifa; 2281 struct in6_ifaddr *ia; 2282 2283 IF_ADDR_RLOCK(ifp); 2284 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2285 if (ifa->ifa_addr->sa_family != AF_INET6) 2286 continue; 2287 ia = (struct in6_ifaddr *)ifa; 2288 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 2289 /* 2290 * The TENTATIVE flag was likely set by hand 2291 * beforehand, implicitly indicating the need for DAD. 2292 * We may be able to skip the random delay in this 2293 * case, but we impose delays just in case. 2294 */ 2295 nd6_dad_start(ifa, 2296 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 2297 } 2298 } 2299 IF_ADDR_RUNLOCK(ifp); 2300 2301 /* 2302 * special cases, like 6to4, are handled in in6_ifattach 2303 */ 2304 in6_ifattach(ifp, NULL); 2305 } 2306 2307 int 2308 in6if_do_dad(struct ifnet *ifp) 2309 { 2310 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 2311 return (0); 2312 2313 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 2314 return (0); 2315 2316 switch (ifp->if_type) { 2317 #ifdef IFT_DUMMY 2318 case IFT_DUMMY: 2319 #endif 2320 case IFT_FAITH: 2321 /* 2322 * These interfaces do not have the IFF_LOOPBACK flag, 2323 * but loop packets back. We do not have to do DAD on such 2324 * interfaces. We should even omit it, because loop-backed 2325 * NS would confuse the DAD procedure. 2326 */ 2327 return (0); 2328 default: 2329 /* 2330 * Our DAD routine requires the interface up and running. 2331 * However, some interfaces can be up before the RUNNING 2332 * status. Additionaly, users may try to assign addresses 2333 * before the interface becomes up (or running). 2334 * We simply skip DAD in such a case as a work around. 2335 * XXX: we should rather mark "tentative" on such addresses, 2336 * and do DAD after the interface becomes ready. 2337 */ 2338 if (!((ifp->if_flags & IFF_UP) && 2339 (ifp->if_drv_flags & IFF_DRV_RUNNING))) 2340 return (0); 2341 2342 return (1); 2343 } 2344 } 2345 2346 /* 2347 * Calculate max IPv6 MTU through all the interfaces and store it 2348 * to in6_maxmtu. 2349 */ 2350 void 2351 in6_setmaxmtu(void) 2352 { 2353 unsigned long maxmtu = 0; 2354 struct ifnet *ifp; 2355 2356 IFNET_RLOCK_NOSLEEP(); 2357 TAILQ_FOREACH(ifp, &V_ifnet, if_list) { 2358 /* this function can be called during ifnet initialization */ 2359 if (!ifp->if_afdata[AF_INET6]) 2360 continue; 2361 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2362 IN6_LINKMTU(ifp) > maxmtu) 2363 maxmtu = IN6_LINKMTU(ifp); 2364 } 2365 IFNET_RUNLOCK_NOSLEEP(); 2366 if (maxmtu) /* update only when maxmtu is positive */ 2367 V_in6_maxmtu = maxmtu; 2368 } 2369 2370 /* 2371 * Provide the length of interface identifiers to be used for the link attached 2372 * to the given interface. The length should be defined in "IPv6 over 2373 * xxx-link" document. Note that address architecture might also define 2374 * the length for a particular set of address prefixes, regardless of the 2375 * link type. As clarified in rfc2462bis, those two definitions should be 2376 * consistent, and those really are as of August 2004. 2377 */ 2378 int 2379 in6_if2idlen(struct ifnet *ifp) 2380 { 2381 switch (ifp->if_type) { 2382 case IFT_ETHER: /* RFC2464 */ 2383 #ifdef IFT_PROPVIRTUAL 2384 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2385 #endif 2386 #ifdef IFT_L2VLAN 2387 case IFT_L2VLAN: /* ditto */ 2388 #endif 2389 #ifdef IFT_IEEE80211 2390 case IFT_IEEE80211: /* ditto */ 2391 #endif 2392 #ifdef IFT_MIP 2393 case IFT_MIP: /* ditto */ 2394 #endif 2395 case IFT_INFINIBAND: 2396 return (64); 2397 case IFT_FDDI: /* RFC2467 */ 2398 return (64); 2399 case IFT_ISO88025: /* RFC2470 (IPv6 over Token Ring) */ 2400 return (64); 2401 case IFT_PPP: /* RFC2472 */ 2402 return (64); 2403 case IFT_ARCNET: /* RFC2497 */ 2404 return (64); 2405 case IFT_FRELAY: /* RFC2590 */ 2406 return (64); 2407 case IFT_IEEE1394: /* RFC3146 */ 2408 return (64); 2409 case IFT_GIF: 2410 return (64); /* draft-ietf-v6ops-mech-v2-07 */ 2411 case IFT_LOOP: 2412 return (64); /* XXX: is this really correct? */ 2413 default: 2414 /* 2415 * Unknown link type: 2416 * It might be controversial to use the today's common constant 2417 * of 64 for these cases unconditionally. For full compliance, 2418 * we should return an error in this case. On the other hand, 2419 * if we simply miss the standard for the link type or a new 2420 * standard is defined for a new link type, the IFID length 2421 * is very likely to be the common constant. As a compromise, 2422 * we always use the constant, but make an explicit notice 2423 * indicating the "unknown" case. 2424 */ 2425 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2426 return (64); 2427 } 2428 } 2429 2430 #include <sys/sysctl.h> 2431 2432 struct in6_llentry { 2433 struct llentry base; 2434 struct sockaddr_in6 l3_addr6; 2435 }; 2436 2437 static struct llentry * 2438 in6_lltable_new(const struct sockaddr *l3addr, u_int flags) 2439 { 2440 struct in6_llentry *lle; 2441 2442 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, 2443 M_DONTWAIT | M_ZERO); 2444 if (lle == NULL) /* NB: caller generates msg */ 2445 return NULL; 2446 2447 lle->l3_addr6 = *(const struct sockaddr_in6 *)l3addr; 2448 lle->base.lle_refcnt = 1; 2449 LLE_LOCK_INIT(&lle->base); 2450 callout_init_rw(&lle->base.ln_timer_ch, &lle->base.lle_lock, 2451 CALLOUT_RETURNUNLOCKED); 2452 2453 return &lle->base; 2454 } 2455 2456 /* 2457 * Deletes an address from the address table. 2458 * This function is called by the timer functions 2459 * such as arptimer() and nd6_llinfo_timer(), and 2460 * the caller does the locking. 2461 */ 2462 static void 2463 in6_lltable_free(struct lltable *llt, struct llentry *lle) 2464 { 2465 LLE_WUNLOCK(lle); 2466 LLE_LOCK_DESTROY(lle); 2467 free(lle, M_LLTABLE); 2468 } 2469 2470 static void 2471 in6_lltable_prefix_free(struct lltable *llt, 2472 const struct sockaddr *prefix, 2473 const struct sockaddr *mask, 2474 u_int flags) 2475 { 2476 const struct sockaddr_in6 *pfx = (const struct sockaddr_in6 *)prefix; 2477 const struct sockaddr_in6 *msk = (const struct sockaddr_in6 *)mask; 2478 struct llentry *lle, *next; 2479 register int i; 2480 2481 /* 2482 * (flags & LLE_STATIC) means deleting all entries 2483 * including static ND6 entries 2484 */ 2485 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) { 2486 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 2487 if (IN6_ARE_MASKED_ADDR_EQUAL( 2488 &((struct sockaddr_in6 *)L3_ADDR(lle))->sin6_addr, 2489 &pfx->sin6_addr, 2490 &msk->sin6_addr) && 2491 ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) { 2492 int canceled; 2493 2494 canceled = callout_drain(&lle->la_timer); 2495 LLE_WLOCK(lle); 2496 if (canceled) 2497 LLE_REMREF(lle); 2498 llentry_free(lle); 2499 } 2500 } 2501 } 2502 } 2503 2504 static int 2505 in6_lltable_rtcheck(struct ifnet *ifp, 2506 u_int flags, 2507 const struct sockaddr *l3addr) 2508 { 2509 struct rtentry *rt; 2510 char ip6buf[INET6_ADDRSTRLEN]; 2511 2512 KASSERT(l3addr->sa_family == AF_INET6, 2513 ("sin_family %d", l3addr->sa_family)); 2514 2515 /* XXX rtalloc1 should take a const param */ 2516 rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0); 2517 if (rt == NULL || (rt->rt_flags & RTF_GATEWAY) || rt->rt_ifp != ifp) { 2518 struct ifaddr *ifa; 2519 /* 2520 * Create an ND6 cache for an IPv6 neighbor 2521 * that is not covered by our own prefix. 2522 */ 2523 /* XXX ifaof_ifpforaddr should take a const param */ 2524 ifa = ifaof_ifpforaddr(__DECONST(struct sockaddr *, l3addr), ifp); 2525 if (ifa != NULL) { 2526 ifa_free(ifa); 2527 if (rt != NULL) 2528 RTFREE_LOCKED(rt); 2529 return 0; 2530 } 2531 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2532 ip6_sprintf(ip6buf, &((const struct sockaddr_in6 *)l3addr)->sin6_addr)); 2533 if (rt != NULL) 2534 RTFREE_LOCKED(rt); 2535 return EINVAL; 2536 } 2537 RTFREE_LOCKED(rt); 2538 return 0; 2539 } 2540 2541 static struct llentry * 2542 in6_lltable_lookup(struct lltable *llt, u_int flags, 2543 const struct sockaddr *l3addr) 2544 { 2545 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2546 struct ifnet *ifp = llt->llt_ifp; 2547 struct llentry *lle; 2548 struct llentries *lleh; 2549 u_int hashkey; 2550 2551 IF_AFDATA_LOCK_ASSERT(ifp); 2552 KASSERT(l3addr->sa_family == AF_INET6, 2553 ("sin_family %d", l3addr->sa_family)); 2554 2555 hashkey = sin6->sin6_addr.s6_addr32[3]; 2556 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)]; 2557 LIST_FOREACH(lle, lleh, lle_next) { 2558 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)L3_ADDR(lle); 2559 if (lle->la_flags & LLE_DELETED) 2560 continue; 2561 if (bcmp(&sa6->sin6_addr, &sin6->sin6_addr, 2562 sizeof(struct in6_addr)) == 0) 2563 break; 2564 } 2565 2566 if (lle == NULL) { 2567 if (!(flags & LLE_CREATE)) 2568 return (NULL); 2569 /* 2570 * A route that covers the given address must have 2571 * been installed 1st because we are doing a resolution, 2572 * verify this. 2573 */ 2574 if (!(flags & LLE_IFADDR) && 2575 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2576 return NULL; 2577 2578 lle = in6_lltable_new(l3addr, flags); 2579 if (lle == NULL) { 2580 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2581 return NULL; 2582 } 2583 lle->la_flags = flags & ~LLE_CREATE; 2584 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) { 2585 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen); 2586 lle->la_flags |= (LLE_VALID | LLE_STATIC); 2587 } 2588 2589 lle->lle_tbl = llt; 2590 lle->lle_head = lleh; 2591 LIST_INSERT_HEAD(lleh, lle, lle_next); 2592 } else if (flags & LLE_DELETE) { 2593 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) { 2594 LLE_WLOCK(lle); 2595 lle->la_flags = LLE_DELETED; 2596 LLE_WUNLOCK(lle); 2597 #ifdef DIAGNOSTIC 2598 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2599 #endif 2600 } 2601 lle = (void *)-1; 2602 } 2603 if (LLE_IS_VALID(lle)) { 2604 if (flags & LLE_EXCLUSIVE) 2605 LLE_WLOCK(lle); 2606 else 2607 LLE_RLOCK(lle); 2608 } 2609 return (lle); 2610 } 2611 2612 static int 2613 in6_lltable_dump(struct lltable *llt, struct sysctl_req *wr) 2614 { 2615 struct ifnet *ifp = llt->llt_ifp; 2616 struct llentry *lle; 2617 /* XXX stack use */ 2618 struct { 2619 struct rt_msghdr rtm; 2620 struct sockaddr_in6 sin6; 2621 /* 2622 * ndp.c assumes that sdl is word aligned 2623 */ 2624 #ifdef __LP64__ 2625 uint32_t pad; 2626 #endif 2627 struct sockaddr_dl sdl; 2628 } ndpc; 2629 int i, error; 2630 2631 if (ifp->if_flags & IFF_LOOPBACK) 2632 return 0; 2633 2634 LLTABLE_LOCK_ASSERT(); 2635 2636 error = 0; 2637 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) { 2638 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 2639 struct sockaddr_dl *sdl; 2640 2641 /* skip deleted or invalid entries */ 2642 if ((lle->la_flags & (LLE_DELETED|LLE_VALID)) != LLE_VALID) 2643 continue; 2644 /* Skip if jailed and not a valid IP of the prison. */ 2645 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0) 2646 continue; 2647 /* 2648 * produce a msg made of: 2649 * struct rt_msghdr; 2650 * struct sockaddr_in6 (IPv6) 2651 * struct sockaddr_dl; 2652 */ 2653 bzero(&ndpc, sizeof(ndpc)); 2654 ndpc.rtm.rtm_msglen = sizeof(ndpc); 2655 ndpc.rtm.rtm_version = RTM_VERSION; 2656 ndpc.rtm.rtm_type = RTM_GET; 2657 ndpc.rtm.rtm_flags = RTF_UP; 2658 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 2659 ndpc.sin6.sin6_family = AF_INET6; 2660 ndpc.sin6.sin6_len = sizeof(ndpc.sin6); 2661 bcopy(L3_ADDR(lle), &ndpc.sin6, L3_ADDR_LEN(lle)); 2662 2663 /* publish */ 2664 if (lle->la_flags & LLE_PUB) 2665 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE; 2666 2667 sdl = &ndpc.sdl; 2668 sdl->sdl_family = AF_LINK; 2669 sdl->sdl_len = sizeof(*sdl); 2670 sdl->sdl_alen = ifp->if_addrlen; 2671 sdl->sdl_index = ifp->if_index; 2672 sdl->sdl_type = ifp->if_type; 2673 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 2674 ndpc.rtm.rtm_rmx.rmx_expire = 2675 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 2676 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 2677 if (lle->la_flags & LLE_STATIC) 2678 ndpc.rtm.rtm_flags |= RTF_STATIC; 2679 ndpc.rtm.rtm_index = ifp->if_index; 2680 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc)); 2681 if (error) 2682 break; 2683 } 2684 } 2685 return error; 2686 } 2687 2688 void * 2689 in6_domifattach(struct ifnet *ifp) 2690 { 2691 struct in6_ifextra *ext; 2692 2693 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2694 bzero(ext, sizeof(*ext)); 2695 2696 ext->in6_ifstat = (struct in6_ifstat *)malloc(sizeof(struct in6_ifstat), 2697 M_IFADDR, M_WAITOK); 2698 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat)); 2699 2700 ext->icmp6_ifstat = 2701 (struct icmp6_ifstat *)malloc(sizeof(struct icmp6_ifstat), 2702 M_IFADDR, M_WAITOK); 2703 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat)); 2704 2705 ext->nd_ifinfo = nd6_ifattach(ifp); 2706 ext->scope6_id = scope6_ifattach(ifp); 2707 ext->lltable = lltable_init(ifp, AF_INET6); 2708 if (ext->lltable != NULL) { 2709 ext->lltable->llt_free = in6_lltable_free; 2710 ext->lltable->llt_prefix_free = in6_lltable_prefix_free; 2711 ext->lltable->llt_lookup = in6_lltable_lookup; 2712 ext->lltable->llt_dump = in6_lltable_dump; 2713 } 2714 2715 ext->mld_ifinfo = mld_domifattach(ifp); 2716 2717 return ext; 2718 } 2719 2720 void 2721 in6_domifdetach(struct ifnet *ifp, void *aux) 2722 { 2723 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2724 2725 mld_domifdetach(ifp); 2726 scope6_ifdetach(ext->scope6_id); 2727 nd6_ifdetach(ext->nd_ifinfo); 2728 lltable_free(ext->lltable); 2729 free(ext->in6_ifstat, M_IFADDR); 2730 free(ext->icmp6_ifstat, M_IFADDR); 2731 free(ext, M_IFADDR); 2732 } 2733 2734 /* 2735 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2736 * v4 mapped addr or v4 compat addr 2737 */ 2738 void 2739 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2740 { 2741 2742 bzero(sin, sizeof(*sin)); 2743 sin->sin_len = sizeof(struct sockaddr_in); 2744 sin->sin_family = AF_INET; 2745 sin->sin_port = sin6->sin6_port; 2746 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2747 } 2748 2749 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2750 void 2751 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2752 { 2753 bzero(sin6, sizeof(*sin6)); 2754 sin6->sin6_len = sizeof(struct sockaddr_in6); 2755 sin6->sin6_family = AF_INET6; 2756 sin6->sin6_port = sin->sin_port; 2757 sin6->sin6_addr.s6_addr32[0] = 0; 2758 sin6->sin6_addr.s6_addr32[1] = 0; 2759 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2760 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2761 } 2762 2763 /* Convert sockaddr_in6 into sockaddr_in. */ 2764 void 2765 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2766 { 2767 struct sockaddr_in *sin_p; 2768 struct sockaddr_in6 sin6; 2769 2770 /* 2771 * Save original sockaddr_in6 addr and convert it 2772 * to sockaddr_in. 2773 */ 2774 sin6 = *(struct sockaddr_in6 *)nam; 2775 sin_p = (struct sockaddr_in *)nam; 2776 in6_sin6_2_sin(sin_p, &sin6); 2777 } 2778 2779 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2780 void 2781 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2782 { 2783 struct sockaddr_in *sin_p; 2784 struct sockaddr_in6 *sin6_p; 2785 2786 sin6_p = malloc(sizeof *sin6_p, M_SONAME, 2787 M_WAITOK); 2788 sin_p = (struct sockaddr_in *)*nam; 2789 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2790 free(*nam, M_SONAME); 2791 *nam = (struct sockaddr *)sin6_p; 2792 } 2793