1 /* $FreeBSD: src/sys/netinet6/in6.c,v 1.7.2.9 2002/04/28 05:40:26 suz Exp $ */ 2 /* $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1991, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)in.c 8.2 (Berkeley) 11/15/93 62 */ 63 64 #include "opt_inet.h" 65 #include "opt_inet6.h" 66 67 #include <sys/param.h> 68 #include <sys/errno.h> 69 #include <sys/malloc.h> 70 #include <sys/socket.h> 71 #include <sys/socketvar.h> 72 #include <sys/sockio.h> 73 #include <sys/systm.h> 74 #include <sys/proc.h> 75 #include <sys/priv.h> 76 #include <sys/time.h> 77 #include <sys/kernel.h> 78 #include <sys/syslog.h> 79 #include <sys/jail.h> 80 81 #include <sys/thread2.h> 82 #include <sys/msgport2.h> 83 84 #include <net/if.h> 85 #include <net/if_types.h> 86 #include <net/route.h> 87 #include <net/if_dl.h> 88 #include <net/netmsg2.h> 89 #include <net/netisr2.h> 90 91 #include <netinet/in.h> 92 #include <netinet/in_var.h> 93 #include <netinet/if_ether.h> 94 #include <netinet/in_systm.h> 95 #include <netinet/ip.h> 96 #include <netinet/in_pcb.h> 97 98 #include <netinet/ip6.h> 99 #include <netinet6/ip6_var.h> 100 #include <netinet6/nd6.h> 101 #include <netinet6/mld6_var.h> 102 #include <netinet6/ip6_mroute.h> 103 #include <netinet6/in6_ifattach.h> 104 #include <netinet6/scope6_var.h> 105 #include <netinet6/in6_pcb.h> 106 #include <netinet6/in6_var.h> 107 108 #include <net/net_osdep.h> 109 110 /* 111 * Definitions of some costant IP6 addresses. 112 */ 113 const struct in6_addr kin6addr_any = IN6ADDR_ANY_INIT; 114 const struct in6_addr kin6addr_loopback = IN6ADDR_LOOPBACK_INIT; 115 const struct in6_addr kin6addr_nodelocal_allnodes = 116 IN6ADDR_NODELOCAL_ALLNODES_INIT; 117 const struct in6_addr kin6addr_linklocal_allnodes = 118 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 119 const struct in6_addr kin6addr_linklocal_allrouters = 120 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 121 122 const struct in6_addr in6mask0 = IN6MASK0; 123 const struct in6_addr in6mask32 = IN6MASK32; 124 const struct in6_addr in6mask64 = IN6MASK64; 125 const struct in6_addr in6mask96 = IN6MASK96; 126 const struct in6_addr in6mask128 = IN6MASK128; 127 128 const struct sockaddr_in6 sa6_any = {sizeof(sa6_any), AF_INET6, 129 0, 0, IN6ADDR_ANY_INIT, 0}; 130 131 static int in6_lifaddr_ioctl (u_long, caddr_t, struct ifnet *, 132 struct thread *); 133 static int in6_ifinit (struct ifnet *, struct in6_ifaddr *, 134 struct sockaddr_in6 *, int); 135 static void in6_unlink_ifa (struct in6_ifaddr *, struct ifnet *); 136 static void in6_ifloop_request_callback(int, int, struct rt_addrinfo *, struct rtentry *, void *); 137 138 static void in6_control_internal_dispatch(netmsg_t); 139 static int in6_control_internal(u_long, caddr_t, struct ifnet *, 140 struct thread *); 141 142 struct in6_multihead in6_multihead; /* XXX BSS initialization */ 143 144 /* 145 * Subroutine for in6_ifaddloop() and in6_ifremloop(). 146 * This routine does actual work. 147 */ 148 static void 149 in6_ifloop_request(int cmd, struct ifaddr *ifa) 150 { 151 struct sockaddr_in6 all1_sa; 152 struct rt_addrinfo rtinfo; 153 int error; 154 155 bzero(&all1_sa, sizeof(all1_sa)); 156 all1_sa.sin6_family = AF_INET6; 157 all1_sa.sin6_len = sizeof(struct sockaddr_in6); 158 all1_sa.sin6_addr = in6mask128; 159 160 /* 161 * We specify the address itself as the gateway, and set the 162 * RTF_LLINFO flag, so that the corresponding host route would have 163 * the flag, and thus applications that assume traditional behavior 164 * would be happy. Note that we assume the caller of the function 165 * (probably implicitly) set nd6_rtrequest() to ifa->ifa_rtrequest, 166 * which changes the outgoing interface to the loopback interface. 167 */ 168 bzero(&rtinfo, sizeof(struct rt_addrinfo)); 169 rtinfo.rti_info[RTAX_DST] = ifa->ifa_addr; 170 rtinfo.rti_info[RTAX_GATEWAY] = ifa->ifa_addr; 171 rtinfo.rti_info[RTAX_NETMASK] = (struct sockaddr *)&all1_sa; 172 rtinfo.rti_flags = RTF_UP|RTF_HOST|RTF_LLINFO; 173 174 error = rtrequest1_global(cmd, &rtinfo, 175 in6_ifloop_request_callback, ifa, RTREQ_PRIO_NORM); 176 if (error != 0) { 177 log(LOG_ERR, "in6_ifloop_request: " 178 "%s operation failed for %s (errno=%d)\n", 179 cmd == RTM_ADD ? "ADD" : "DELETE", 180 ip6_sprintf(&((struct in6_ifaddr *)ifa)->ia_addr.sin6_addr), 181 error); 182 } 183 } 184 185 static void 186 in6_ifloop_request_callback(int cmd, int error, struct rt_addrinfo *rtinfo, 187 struct rtentry *rt, void *arg) 188 { 189 struct ifaddr *ifa = arg; 190 191 if (error) 192 goto done; 193 194 /* 195 * Make sure rt_ifa be equal to IFA, the second argument of the 196 * function. 197 * We need this because when we refer to rt_ifa->ia6_flags in 198 * ip6_input, we assume that the rt_ifa points to the address instead 199 * of the loopback address. 200 */ 201 if (cmd == RTM_ADD && rt && ifa != rt->rt_ifa) { 202 ++rt->rt_refcnt; 203 IFAFREE(rt->rt_ifa); 204 IFAREF(ifa); 205 rt->rt_ifa = ifa; 206 --rt->rt_refcnt; 207 } 208 209 /* 210 * Report the addition/removal of the address to the routing socket. 211 * XXX: since we called rtinit for a p2p interface with a destination, 212 * we end up reporting twice in such a case. Should we rather 213 * omit the second report? 214 */ 215 if (rt) { 216 if (mycpuid == 0) 217 rt_newaddrmsg(cmd, ifa, error, rt); 218 if (cmd == RTM_DELETE) { 219 if (rt->rt_refcnt == 0) { 220 ++rt->rt_refcnt; 221 rtfree(rt); 222 } 223 } 224 } 225 done: 226 /* no way to return any new error */ 227 ; 228 } 229 230 /* 231 * Add ownaddr as loopback rtentry. We previously add the route only if 232 * necessary (ex. on a p2p link). However, since we now manage addresses 233 * separately from prefixes, we should always add the route. We can't 234 * rely on the cloning mechanism from the corresponding interface route 235 * any more. 236 */ 237 void 238 in6_ifaddloop(struct ifaddr *ifa) 239 { 240 struct rtentry *rt; 241 242 /* If there is no loopback entry, allocate one. */ 243 rt = rtpurelookup(ifa->ifa_addr); 244 if (rt == NULL || !(rt->rt_flags & RTF_HOST) || 245 !(rt->rt_ifp->if_flags & IFF_LOOPBACK)) 246 in6_ifloop_request(RTM_ADD, ifa); 247 if (rt != NULL) 248 rt->rt_refcnt--; 249 } 250 251 /* 252 * Remove loopback rtentry of ownaddr generated by in6_ifaddloop(), 253 * if it exists. 254 */ 255 void 256 in6_ifremloop(struct ifaddr *ifa) 257 { 258 struct in6_ifaddr *ia; 259 struct rtentry *rt; 260 int ia_count = 0; 261 262 /* 263 * Some of BSD variants do not remove cloned routes 264 * from an interface direct route, when removing the direct route 265 * (see comments in net/net_osdep.h). Even for variants that do remove 266 * cloned routes, they could fail to remove the cloned routes when 267 * we handle multple addresses that share a common prefix. 268 * So, we should remove the route corresponding to the deleted address 269 * regardless of the result of in6_is_ifloop_auto(). 270 */ 271 272 /* 273 * Delete the entry only if exact one ifa exists. More than one ifa 274 * can exist if we assign a same single address to multiple 275 * (probably p2p) interfaces. 276 * XXX: we should avoid such a configuration in IPv6... 277 */ 278 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 279 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ia->ia_addr.sin6_addr)) { 280 ia_count++; 281 if (ia_count > 1) 282 break; 283 } 284 } 285 286 if (ia_count == 1) { 287 /* 288 * Before deleting, check if a corresponding loopbacked host 289 * route surely exists. With this check, we can avoid to 290 * delete an interface direct route whose destination is same 291 * as the address being removed. This can happen when remofing 292 * a subnet-router anycast address on an interface attahced 293 * to a shared medium. 294 */ 295 rt = rtpurelookup(ifa->ifa_addr); 296 if (rt != NULL && (rt->rt_flags & RTF_HOST) && 297 (rt->rt_ifp->if_flags & IFF_LOOPBACK)) { 298 rt->rt_refcnt--; 299 in6_ifloop_request(RTM_DELETE, ifa); 300 } 301 } 302 } 303 304 int 305 in6_mask2len(const struct in6_addr *mask, const u_char *lim0) 306 { 307 int x = 0, y; 308 const u_char *lim = lim0, *p; 309 310 if (lim0 == NULL || 311 lim0 - (const u_char *)mask > sizeof(*mask)) { 312 /* Ignore the scope_id part */ 313 lim = (const u_char *)mask + sizeof(*mask); 314 } 315 for (p = (const u_char *)mask; p < lim; x++, p++) { 316 if (*p != 0xff) 317 break; 318 } 319 y = 0; 320 if (p < lim) { 321 for (y = 0; y < 8; y++) { 322 if ((*p & (0x80 >> y)) == 0) 323 break; 324 } 325 } 326 327 /* 328 * When the limit pointer is given, do a stricter check on the 329 * remaining bits. 330 */ 331 if (p < lim) { 332 if (y != 0 && (*p & (0x00ff >> y)) != 0) 333 return (-1); 334 for (p = p + 1; p < lim; p++) 335 if (*p != 0) 336 return (-1); 337 } 338 339 return x * 8 + y; 340 } 341 342 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 343 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 344 345 void 346 in6_control_dispatch(netmsg_t msg) 347 { 348 int error; 349 350 error = in6_control(msg->control.nm_cmd, 351 msg->control.nm_data, 352 msg->control.nm_ifp, 353 msg->control.nm_td); 354 lwkt_replymsg(&msg->control.base.lmsg, error); 355 } 356 357 int 358 in6_control(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td) 359 { 360 struct netmsg_pru_control msg; 361 362 switch (cmd) { 363 case SIOCSIFPREFIX_IN6: 364 case SIOCDIFPREFIX_IN6: 365 case SIOCAIFPREFIX_IN6: 366 case SIOCCIFPREFIX_IN6: 367 case SIOCSGIFPREFIX_IN6: 368 case SIOCGIFPREFIX_IN6: 369 log(LOG_NOTICE, "prefix ioctls are now invalidated. " 370 "please use ifconfig.\n"); 371 return (EOPNOTSUPP); 372 373 case SIOCSIFADDR_IN6: 374 case SIOCSIFDSTADDR_IN6: 375 case SIOCSIFNETMASK_IN6: 376 /* 377 * Since IPv6 allows a node to assign multiple addresses 378 * on a single interface, SIOCSIFxxx ioctls are not suitable 379 * and should be unused. 380 */ 381 /* We decided to obsolete this command (20000704) */ 382 return (EINVAL); 383 384 case SIOCSIFADDR: 385 case SIOCSIFDSTADDR: 386 case SIOCSIFBRDADDR: 387 case SIOCSIFNETMASK: 388 /* 389 * Do not pass those ioctl to driver handler since they are not 390 * properly setup. Instead just error out. 391 */ 392 return (EOPNOTSUPP); 393 394 /* mroute */ 395 case SIOCGETSGCNT_IN6: 396 case SIOCGETMIFCNT_IN6: 397 /* srcsel policy */ 398 case SIOCAADDRCTL_POLICY: 399 case SIOCDADDRCTL_POLICY: 400 /* nd6 */ 401 case SIOCSNDFLUSH_IN6: 402 case SIOCSPFXFLUSH_IN6: 403 case SIOCSRTRFLUSH_IN6: 404 case SIOCSDEFIFACE_IN6: 405 case SIOCSIFINFO_FLAGS: 406 case OSIOCGIFINFO_IN6: 407 case SIOCGIFINFO_IN6: 408 case SIOCGDRLST_IN6: 409 case SIOCGPRLST_IN6: 410 case SIOCGNBRINFO_IN6: 411 case SIOCGDEFIFACE_IN6: 412 /* scope6 */ 413 case SIOCSSCOPE6: 414 case SIOCGSCOPE6: 415 case SIOCGSCOPE6DEF: 416 /* change address */ 417 case SIOCALIFADDR: 418 case SIOCDLIFADDR: 419 case SIOCSIFALIFETIME_IN6: 420 case SIOCAIFADDR_IN6: 421 case SIOCDIFADDR_IN6: 422 /* 423 * Dispatch these SIOCs to netisr0. 424 */ 425 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 0, 426 in6_control_internal_dispatch); 427 msg.nm_cmd = cmd; 428 msg.nm_data = data; 429 msg.nm_ifp = ifp; 430 msg.nm_td = td; 431 lwkt_domsg(netisr_cpuport(0), &msg.base.lmsg, 0); 432 return msg.base.lmsg.ms_error; 433 434 default: 435 return in6_control_internal(cmd, data, ifp, td); 436 } 437 } 438 439 static void 440 in6_control_internal_dispatch(netmsg_t msg) 441 { 442 int error; 443 444 error = in6_control_internal(msg->control.nm_cmd, msg->control.nm_data, 445 msg->control.nm_ifp, msg->control.nm_td); 446 lwkt_replymsg(&msg->lmsg, error); 447 } 448 449 static int 450 in6_control_internal(u_long cmd, caddr_t data, struct ifnet *ifp, 451 struct thread *td) 452 { 453 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 454 struct in6_ifaddr *ia = NULL; 455 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 456 struct in6_ifextra *xtra; 457 boolean_t privileged; 458 int error; 459 460 privileged = FALSE; 461 if (priv_check(td, PRIV_ROOT) == 0) 462 privileged = TRUE; 463 464 switch (cmd) { 465 case SIOCALIFADDR: 466 case SIOCDLIFADDR: 467 if (!privileged) 468 return (EPERM); 469 /* FALLTHROUGH */ 470 case SIOCGLIFADDR: 471 if (ifp == NULL) 472 return (EOPNOTSUPP); 473 return in6_lifaddr_ioctl(cmd, data, ifp, td); 474 } 475 476 switch (cmd) { 477 case SIOCGETSGCNT_IN6: 478 case SIOCGETMIFCNT_IN6: 479 return (mrt6_ioctl(cmd, data)); 480 } 481 482 switch(cmd) { 483 case SIOCAADDRCTL_POLICY: 484 case SIOCDADDRCTL_POLICY: 485 if (!privileged) 486 return (EPERM); 487 return (in6_src_ioctl(cmd, data)); 488 } 489 490 if (ifp == NULL) 491 return (EOPNOTSUPP); 492 493 switch (cmd) { 494 case SIOCSNDFLUSH_IN6: 495 case SIOCSPFXFLUSH_IN6: 496 case SIOCSRTRFLUSH_IN6: 497 case SIOCSDEFIFACE_IN6: 498 case SIOCSIFINFO_FLAGS: 499 if (!privileged) 500 return (EPERM); 501 /* FALLTHROUGH */ 502 case OSIOCGIFINFO_IN6: 503 case SIOCGIFINFO_IN6: 504 case SIOCGDRLST_IN6: 505 case SIOCGPRLST_IN6: 506 case SIOCGNBRINFO_IN6: 507 case SIOCGDEFIFACE_IN6: 508 return (nd6_ioctl(cmd, data, ifp)); 509 } 510 511 switch (cmd) { 512 case SIOCSSCOPE6: 513 if (!privileged) 514 return (EPERM); 515 return (scope6_set(ifp, 516 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 517 518 case SIOCGSCOPE6: 519 return (scope6_get(ifp, 520 (struct scope6_id *)ifr->ifr_ifru.ifru_scope_id)); 521 522 case SIOCGSCOPE6DEF: 523 return (scope6_get_default((struct scope6_id *) 524 ifr->ifr_ifru.ifru_scope_id)); 525 } 526 527 /* 528 * Find address for this interface, if it exists. 529 */ 530 if (ifra->ifra_addr.sin6_family == AF_INET6) { /* XXX */ 531 struct sockaddr_in6 *sa6 = 532 (struct sockaddr_in6 *)&ifra->ifra_addr; 533 534 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) { 535 if (sa6->sin6_addr.s6_addr16[1] == 0) { 536 /* Link ID is not embedded by the user */ 537 sa6->sin6_addr.s6_addr16[1] = 538 htons(ifp->if_index); 539 } else if (sa6->sin6_addr.s6_addr16[1] != 540 htons(ifp->if_index)) { 541 /* Link ID contradicts */ 542 return (EINVAL); 543 } 544 if (sa6->sin6_scope_id) { 545 if (sa6->sin6_scope_id != 546 (u_int32_t)ifp->if_index) 547 return (EINVAL); 548 sa6->sin6_scope_id = 0; /* XXX: good way? */ 549 } 550 } 551 ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr); 552 } 553 554 switch (cmd) { 555 case SIOCDIFADDR_IN6: 556 /* 557 * For IPv4, we look for existing in_ifaddr here to allow 558 * "ifconfig if0 delete" to remove first IPv4 address on the 559 * interface. For IPv6, as the spec allow multiple interface 560 * address from the day one, we consider "remove the first one" 561 * semantics to be not preferable. 562 */ 563 if (ia == NULL) 564 return (EADDRNOTAVAIL); 565 /* FALLTHROUGH */ 566 case SIOCAIFADDR_IN6: 567 /* 568 * We always require users to specify a valid IPv6 address for 569 * the corresponding operation. 570 */ 571 if (ifra->ifra_addr.sin6_family != AF_INET6 || 572 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) 573 return (EAFNOSUPPORT); 574 if (!privileged) 575 return (EPERM); 576 break; 577 578 case SIOCGIFADDR_IN6: 579 /* This interface is basically deprecated. Use SIOCGIFCONF. */ 580 /* FALLTHROUGH */ 581 case SIOCGIFAFLAG_IN6: 582 case SIOCGIFNETMASK_IN6: 583 case SIOCGIFDSTADDR_IN6: 584 case SIOCGIFALIFETIME_IN6: 585 /* Must think again about its semantics */ 586 if (ia == NULL) 587 return (EADDRNOTAVAIL); 588 break; 589 590 case SIOCSIFALIFETIME_IN6: 591 { 592 const struct in6_addrlifetime *lt; 593 594 if (!privileged) 595 return (EPERM); 596 if (ia == NULL) 597 return (EADDRNOTAVAIL); 598 /* Sanity for overflow - beware unsigned */ 599 lt = &ifr->ifr_ifru.ifru_lifetime; 600 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME && 601 lt->ia6t_vltime + time_uptime < time_uptime) 602 return EINVAL; 603 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME && 604 lt->ia6t_pltime + time_uptime < time_uptime) 605 return EINVAL; 606 break; 607 } 608 } 609 610 switch (cmd) { 611 case SIOCGIFADDR_IN6: 612 ifr->ifr_addr = ia->ia_addr; 613 break; 614 615 case SIOCGIFDSTADDR_IN6: 616 if (!(ifp->if_flags & IFF_POINTOPOINT)) 617 return (EINVAL); 618 /* 619 * XXX: Should we check if ifa_dstaddr is NULL and return 620 * an error? 621 */ 622 ifr->ifr_dstaddr = ia->ia_dstaddr; 623 break; 624 625 case SIOCGIFNETMASK_IN6: 626 ifr->ifr_addr = ia->ia_prefixmask; 627 break; 628 629 case SIOCGIFAFLAG_IN6: 630 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 631 break; 632 633 case SIOCGIFSTAT_IN6: 634 if ((xtra = ifp->if_afdata[AF_INET6]) == NULL) 635 return EINVAL; 636 bzero(&ifr->ifr_ifru.ifru_stat, 637 sizeof(ifr->ifr_ifru.ifru_stat)); 638 ifr->ifr_ifru.ifru_stat = *xtra->in6_ifstat; 639 break; 640 641 case SIOCGIFSTAT_ICMP6: 642 if ((xtra = ifp->if_afdata[AF_INET6]) == NULL) 643 return EINVAL; 644 bzero(&ifr->ifr_ifru.ifru_stat, 645 sizeof(ifr->ifr_ifru.ifru_icmp6stat)); 646 ifr->ifr_ifru.ifru_icmp6stat = *xtra->icmp6_ifstat; 647 break; 648 649 case SIOCGIFALIFETIME_IN6: 650 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 651 break; 652 653 case SIOCSIFALIFETIME_IN6: 654 ia->ia6_lifetime = ifr->ifr_ifru.ifru_lifetime; 655 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 656 ia->ia6_lifetime.ia6t_expire = 657 time_uptime + ia->ia6_lifetime.ia6t_vltime; 658 } else { 659 ia->ia6_lifetime.ia6t_expire = 0; 660 } 661 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 662 ia->ia6_lifetime.ia6t_preferred = 663 time_uptime + ia->ia6_lifetime.ia6t_pltime; 664 } else { 665 ia->ia6_lifetime.ia6t_preferred = 0; 666 } 667 break; 668 669 case SIOCAIFADDR_IN6: 670 { 671 int i, error = 0, iaIsNew; 672 struct nd_prefix pr0, *pr; 673 674 if (ia != NULL) 675 iaIsNew = 0; 676 else 677 iaIsNew = 1; 678 679 /* 680 * First, make or update the interface address structure, 681 * and link it to the list. 682 */ 683 if ((error = in6_update_ifa(ifp, ifra, ia)) != 0) 684 return (error); 685 686 /* 687 * Then, make the prefix on-link on the interface. 688 * XXX: We'd rather create the prefix before the address, but 689 * we need at least one address to install the corresponding 690 * interface route, so we configure the address first. 691 */ 692 693 /* 694 * Convert mask to prefix length (prefixmask has already 695 * been validated in in6_update_ifa(). 696 */ 697 bzero(&pr0, sizeof(pr0)); 698 pr0.ndpr_ifp = ifp; 699 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 700 NULL); 701 if (pr0.ndpr_plen == 128) 702 break; /* no need to install a host route. */ 703 pr0.ndpr_prefix = ifra->ifra_addr; 704 pr0.ndpr_mask = ifra->ifra_prefixmask.sin6_addr; 705 /* Apply the mask for safety. */ 706 for (i = 0; i < 4; i++) { 707 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 708 ifra->ifra_prefixmask.sin6_addr.s6_addr32[i]; 709 } 710 /* 711 * XXX: Since we don't have an API to set prefix (not address) 712 * lifetimes, we just use the same lifetimes as addresses. 713 * The (temporarily) installed lifetimes can be overridden by 714 * later advertised RAs (when accept_rtadv is non 0), which is 715 * an intended behavior. 716 */ 717 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 718 pr0.ndpr_raf_auto = 719 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 720 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 721 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 722 723 /* Add the prefix if there's one. */ 724 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 725 /* 726 * nd6_prelist_add will install the corresponding 727 * interface route. 728 */ 729 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) 730 return (error); 731 if (pr == NULL) { 732 log(LOG_ERR, "nd6_prelist_add succeeded but " 733 "no prefix\n"); 734 return (EINVAL); /* XXX panic here? */ 735 } 736 } 737 738 ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr); 739 if (ia == NULL) { 740 /* XXX: This should not happen! */ 741 log(LOG_ERR, "in6_control: addition succeeded, but" 742 " no ifaddr\n"); 743 } else { 744 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 745 ia->ia6_ndpr == NULL) { 746 /* 747 * New autoconf address 748 */ 749 ia->ia6_ndpr = pr; 750 pr->ndpr_refcnt++; 751 752 /* 753 * If this is the first autoconf address from 754 * the prefix, create a temporary address 755 * as well (when specified). 756 */ 757 if (ip6_use_tempaddr && pr->ndpr_refcnt == 1) { 758 int e; 759 760 if ((e = in6_tmpifadd(ia, 1)) != 0) { 761 log(LOG_NOTICE, "in6_control: " 762 "failed to create a " 763 "temporary address, " 764 "errno=%d\n", e); 765 } 766 } 767 } 768 769 /* 770 * This might affect the status of autoconfigured 771 * addresses, that is, this address might make 772 * other addresses detached. 773 */ 774 pfxlist_onlink_check(); 775 } 776 if (error == 0 && ia) { 777 EVENTHANDLER_INVOKE(ifaddr_event, ifp, 778 iaIsNew ? IFADDR_EVENT_ADD : IFADDR_EVENT_CHANGE, 779 &ia->ia_ifa); 780 } 781 break; 782 } 783 784 case SIOCDIFADDR_IN6: 785 { 786 int i = 0; 787 struct nd_prefix pr0, *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 warry 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 */ 798 bzero(&pr0, sizeof(pr0)); 799 pr0.ndpr_ifp = ifp; 800 pr0.ndpr_plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, 801 NULL); 802 if (pr0.ndpr_plen == 128) 803 goto purgeaddr; 804 pr0.ndpr_prefix = ia->ia_addr; 805 pr0.ndpr_mask = ia->ia_prefixmask.sin6_addr; 806 for (i = 0; i < 4; i++) { 807 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 808 ia->ia_prefixmask.sin6_addr.s6_addr32[i]; 809 } 810 /* 811 * The logic of the following condition is a bit complicated. 812 * We expire the prefix when 813 * 1. The address obeys autoconfiguration and it is the 814 * only owner of the associated prefix, or 815 * 2. The address does not obey autoconf and there is no 816 * other owner of the prefix. 817 */ 818 if ((pr = nd6_prefix_lookup(&pr0)) != NULL && 819 (((ia->ia6_flags & IN6_IFF_AUTOCONF) && 820 pr->ndpr_refcnt == 1) || 821 (!(ia->ia6_flags & IN6_IFF_AUTOCONF) && 822 pr->ndpr_refcnt == 0))) 823 pr->ndpr_expire = 1; /* XXX: just for expiration */ 824 825 purgeaddr: 826 EVENTHANDLER_INVOKE(ifaddr_event, ifp, IFADDR_EVENT_DELETE, 827 &ia->ia_ifa); 828 in6_purgeaddr(&ia->ia_ifa); 829 break; 830 } 831 832 default: 833 if (ifp->if_ioctl == NULL) 834 return (EOPNOTSUPP); 835 ifnet_serialize_all(ifp); 836 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred); 837 ifnet_deserialize_all(ifp); 838 return (error); 839 } 840 841 return (0); 842 } 843 844 /* 845 * Update parameters of an IPv6 interface address. 846 * If necessary, a new entry is created and linked into address chains. 847 * This function is separated from in6_control(). 848 * XXX: should this be performed under splnet()? 849 */ 850 int 851 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 852 struct in6_ifaddr *ia) 853 { 854 int error = 0, hostIsNew = 0, plen = -1; 855 struct in6_ifaddr *oia; 856 struct sockaddr_in6 dst6; 857 struct in6_addrlifetime *lt; 858 859 /* Validate parameters */ 860 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 861 return (EINVAL); 862 863 /* 864 * The destination address for a p2p link must have a family 865 * of AF_UNSPEC or AF_INET6. 866 */ 867 if ((ifp->if_flags & IFF_POINTOPOINT) && 868 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 869 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 870 return (EAFNOSUPPORT); 871 /* 872 * validate ifra_prefixmask. don't check sin6_family, netmask 873 * does not carry fields other than sin6_len. 874 */ 875 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 876 return (EINVAL); 877 /* 878 * Because the IPv6 address architecture is classless, we require 879 * users to specify a (non 0) prefix length (mask) for a new address. 880 * We also require the prefix (when specified) mask is valid, and thus 881 * reject a non-consecutive mask. 882 */ 883 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 884 return (EINVAL); 885 if (ifra->ifra_prefixmask.sin6_len != 0) { 886 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 887 (u_char *)&ifra->ifra_prefixmask + 888 ifra->ifra_prefixmask.sin6_len); 889 if (plen <= 0) 890 return (EINVAL); 891 } 892 else { 893 /* 894 * In this case, ia must not be NULL. We just use its prefix 895 * length. 896 */ 897 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 898 } 899 /* 900 * If the destination address on a p2p interface is specified, 901 * and the address is a scoped one, validate/set the scope 902 * zone identifier. 903 */ 904 dst6 = ifra->ifra_dstaddr; 905 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) && 906 (dst6.sin6_family == AF_INET6)) { 907 int scopeid; 908 909 if ((error = in6_recoverscope(&dst6, 910 &ifra->ifra_dstaddr.sin6_addr, 911 ifp)) != 0) 912 return (error); 913 if (in6_addr2zoneid(ifp, &dst6.sin6_addr, &scopeid)) 914 return (EINVAL); 915 if (dst6.sin6_scope_id == 0) /* user omit to specify the ID. */ 916 dst6.sin6_scope_id = scopeid; 917 else if (dst6.sin6_scope_id != scopeid) 918 return (EINVAL); /* scope ID mismatch. */ 919 if ((error = in6_embedscope(&dst6.sin6_addr, &dst6, NULL, NULL)) 920 != 0) 921 return (error); 922 dst6.sin6_scope_id = 0; /* XXX */ 923 } 924 /* 925 * The destination address can be specified only for a p2p or a 926 * loopback interface. If specified, the corresponding prefix length 927 * must be 128. 928 */ 929 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 930 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0) { 931 /* XXX: noisy message */ 932 log(LOG_INFO, "in6_update_ifa: a destination can be " 933 "specified for a p2p or a loopback IF only\n"); 934 return (EINVAL); 935 } 936 if (plen != 128) { 937 /* 938 * The following message seems noisy, but we dare to 939 * add it for diagnosis. 940 */ 941 log(LOG_INFO, "in6_update_ifa: prefixlen must be 128 " 942 "when dstaddr is specified\n"); 943 return (EINVAL); 944 } 945 } 946 /* lifetime consistency check */ 947 lt = &ifra->ifra_lifetime; 948 if (lt->ia6t_vltime != ND6_INFINITE_LIFETIME 949 && lt->ia6t_vltime + time_uptime < time_uptime) { 950 return EINVAL; 951 } 952 if (lt->ia6t_vltime == 0) { 953 /* 954 * the following log might be noisy, but this is a typical 955 * configuration mistake or a tool's bug. 956 */ 957 log(LOG_INFO, 958 "in6_update_ifa: valid lifetime is 0 for %s\n", 959 ip6_sprintf(&ifra->ifra_addr.sin6_addr)); 960 } 961 if (lt->ia6t_pltime != ND6_INFINITE_LIFETIME 962 && lt->ia6t_pltime + time_uptime < time_uptime) { 963 return EINVAL; 964 } 965 966 /* 967 * If this is a new address, allocate a new ifaddr and link it 968 * into chains. 969 */ 970 if (ia == NULL) { 971 hostIsNew = 1; 972 ia = ifa_create(sizeof(*ia)); 973 974 /* Initialize the address and masks */ 975 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 976 ia->ia_addr.sin6_family = AF_INET6; 977 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 978 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 979 /* 980 * XXX: some functions expect that ifa_dstaddr is not 981 * NULL for p2p interfaces. 982 */ 983 ia->ia_ifa.ifa_dstaddr 984 = (struct sockaddr *)&ia->ia_dstaddr; 985 } else { 986 ia->ia_ifa.ifa_dstaddr = NULL; 987 } 988 ia->ia_ifa.ifa_netmask 989 = (struct sockaddr *)&ia->ia_prefixmask; 990 991 ia->ia_ifp = ifp; 992 if ((oia = in6_ifaddr) != NULL) { 993 for ( ; oia->ia_next; oia = oia->ia_next) 994 continue; 995 oia->ia_next = ia; 996 } else 997 in6_ifaddr = ia; 998 999 ifa_iflink(&ia->ia_ifa, ifp, 1); 1000 } 1001 1002 /* set prefix mask */ 1003 if (ifra->ifra_prefixmask.sin6_len) { 1004 /* 1005 * We prohibit changing the prefix length of an existing 1006 * address, because 1007 * + such an operation should be rare in IPv6, and 1008 * + the operation would confuse prefix management. 1009 */ 1010 if (ia->ia_prefixmask.sin6_len && 1011 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 1012 log(LOG_INFO, "in6_update_ifa: the prefix length of an" 1013 " existing (%s) address should not be changed\n", 1014 ip6_sprintf(&ia->ia_addr.sin6_addr)); 1015 error = EINVAL; 1016 goto unlink; 1017 } 1018 ia->ia_prefixmask = ifra->ifra_prefixmask; 1019 } 1020 1021 /* 1022 * If a new destination address is specified, scrub the old one and 1023 * install the new destination. Note that the interface must be 1024 * p2p or loopback (see the check above.) 1025 */ 1026 if (dst6.sin6_family == AF_INET6 && 1027 !IN6_ARE_ADDR_EQUAL(&dst6.sin6_addr, 1028 &ia->ia_dstaddr.sin6_addr)) { 1029 int e; 1030 1031 if ((ia->ia_flags & IFA_ROUTE) && 1032 (e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 1033 != 0) { 1034 log(LOG_ERR, "in6_update_ifa: failed to remove " 1035 "a route to the old destination: %s\n", 1036 ip6_sprintf(&ia->ia_addr.sin6_addr)); 1037 /* proceed anyway... */ 1038 } 1039 else 1040 ia->ia_flags &= ~IFA_ROUTE; 1041 ia->ia_dstaddr = dst6; 1042 } 1043 1044 /* reset the interface and routing table appropriately. */ 1045 if ((error = in6_ifinit(ifp, ia, &ifra->ifra_addr, hostIsNew)) != 0) 1046 goto unlink; 1047 1048 /* 1049 * Beyond this point, we should call in6_purgeaddr upon an error, 1050 * not just go to unlink. 1051 */ 1052 1053 if (ifp->if_flags & IFF_MULTICAST) { 1054 struct sockaddr_in6 mltaddr, mltmask; 1055 struct in6_multi *in6m; 1056 1057 if (hostIsNew) { 1058 /* 1059 * join solicited multicast addr for new host id 1060 */ 1061 struct in6_addr llsol; 1062 bzero(&llsol, sizeof(struct in6_addr)); 1063 llsol.s6_addr16[0] = htons(0xff02); 1064 llsol.s6_addr16[1] = htons(ifp->if_index); 1065 llsol.s6_addr32[1] = 0; 1066 llsol.s6_addr32[2] = htonl(1); 1067 llsol.s6_addr32[3] = 1068 ifra->ifra_addr.sin6_addr.s6_addr32[3]; 1069 llsol.s6_addr8[12] = 0xff; 1070 in6_addmulti(&llsol, ifp, &error); 1071 if (error != 0) { 1072 log(LOG_WARNING, 1073 "in6_update_ifa: addmulti failed for " 1074 "%s on %s (errno=%d)\n", 1075 ip6_sprintf(&llsol), if_name(ifp), 1076 error); 1077 in6_purgeaddr((struct ifaddr *)ia); 1078 return (error); 1079 } 1080 } 1081 1082 bzero(&mltmask, sizeof(mltmask)); 1083 mltmask.sin6_len = sizeof(struct sockaddr_in6); 1084 mltmask.sin6_family = AF_INET6; 1085 mltmask.sin6_addr = in6mask32; 1086 1087 /* 1088 * join link-local all-nodes address 1089 */ 1090 bzero(&mltaddr, sizeof(mltaddr)); 1091 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 1092 mltaddr.sin6_family = AF_INET6; 1093 mltaddr.sin6_addr = kin6addr_linklocal_allnodes; 1094 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1095 1096 in6m = IN6_LOOKUP_MULTI(&mltaddr.sin6_addr, ifp); 1097 if (in6m == NULL) { 1098 rtrequest_global(RTM_ADD, 1099 (struct sockaddr *)&mltaddr, 1100 (struct sockaddr *)&ia->ia_addr, 1101 (struct sockaddr *)&mltmask, 1102 RTF_UP|RTF_CLONING); /* xxx */ 1103 in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 1104 if (error != 0) { 1105 log(LOG_WARNING, 1106 "in6_update_ifa: addmulti failed for " 1107 "%s on %s (errno=%d)\n", 1108 ip6_sprintf(&mltaddr.sin6_addr), 1109 if_name(ifp), error); 1110 } 1111 } 1112 1113 /* 1114 * join node information group address 1115 */ 1116 #define hostnamelen strlen(hostname) 1117 if (in6_nigroup(ifp, hostname, hostnamelen, &mltaddr.sin6_addr) 1118 == 0) { 1119 in6m = IN6_LOOKUP_MULTI(&mltaddr.sin6_addr, ifp); 1120 if (in6m == NULL && ia != NULL) { 1121 in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 1122 if (error != 0) { 1123 log(LOG_WARNING, "in6_update_ifa: " 1124 "addmulti failed for " 1125 "%s on %s (errno=%d)\n", 1126 ip6_sprintf(&mltaddr.sin6_addr), 1127 if_name(ifp), error); 1128 } 1129 } 1130 } 1131 #undef hostnamelen 1132 1133 /* 1134 * join node-local all-nodes address, on loopback. 1135 * XXX: since "node-local" is obsoleted by interface-local, 1136 * we have to join the group on every interface with 1137 * some interface-boundary restriction. 1138 */ 1139 if (ifp->if_flags & IFF_LOOPBACK) { 1140 struct in6_ifaddr *ia_loop; 1141 1142 struct in6_addr loop6 = kin6addr_loopback; 1143 ia_loop = in6ifa_ifpwithaddr(ifp, &loop6); 1144 1145 mltaddr.sin6_addr = kin6addr_nodelocal_allnodes; 1146 1147 in6m = IN6_LOOKUP_MULTI(&mltaddr.sin6_addr, ifp); 1148 if (in6m == NULL && ia_loop != NULL) { 1149 rtrequest_global(RTM_ADD, 1150 (struct sockaddr *)&mltaddr, 1151 (struct sockaddr *)&ia_loop->ia_addr, 1152 (struct sockaddr *)&mltmask, 1153 RTF_UP); 1154 in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 1155 if (error != 0) { 1156 log(LOG_WARNING, "in6_update_ifa: " 1157 "addmulti failed for %s on %s " 1158 "(errno=%d)\n", 1159 ip6_sprintf(&mltaddr.sin6_addr), 1160 if_name(ifp), error); 1161 } 1162 } 1163 } 1164 } 1165 1166 ia->ia6_flags = ifra->ifra_flags; 1167 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /*safety*/ 1168 ia->ia6_flags &= ~IN6_IFF_NODAD; /* Mobile IPv6 */ 1169 1170 ia->ia6_lifetime = ifra->ifra_lifetime; 1171 /* for sanity */ 1172 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1173 ia->ia6_lifetime.ia6t_expire = 1174 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1175 } else 1176 ia->ia6_lifetime.ia6t_expire = 0; 1177 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1178 ia->ia6_lifetime.ia6t_preferred = 1179 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1180 } else 1181 ia->ia6_lifetime.ia6t_preferred = 0; 1182 1183 /* 1184 * Perform DAD, if needed. 1185 * XXX It may be of use, if we can administratively 1186 * disable DAD. 1187 */ 1188 if (in6if_do_dad(ifp) && !(ifra->ifra_flags & IN6_IFF_NODAD)) { 1189 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1190 nd6_dad_start((struct ifaddr *)ia, NULL); 1191 } 1192 1193 return (error); 1194 1195 unlink: 1196 /* 1197 * XXX: if a change of an existing address failed, keep the entry 1198 * anyway. 1199 */ 1200 if (hostIsNew) 1201 in6_unlink_ifa(ia, ifp); 1202 return (error); 1203 } 1204 1205 void 1206 in6_purgeaddr(struct ifaddr *ifa) 1207 { 1208 struct ifnet *ifp = ifa->ifa_ifp; 1209 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1210 1211 /* stop DAD processing */ 1212 nd6_dad_stop(ifa); 1213 1214 /* 1215 * delete route to the destination of the address being purged. 1216 * The interface must be p2p or loopback in this case. 1217 */ 1218 if ((ia->ia_flags & IFA_ROUTE) && ia->ia_dstaddr.sin6_len != 0) { 1219 int e; 1220 1221 if ((e = rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST)) 1222 != 0) { 1223 log(LOG_ERR, "in6_purgeaddr: failed to remove " 1224 "a route to the p2p destination: %s on %s, " 1225 "errno=%d\n", 1226 ip6_sprintf(&ia->ia_addr.sin6_addr), if_name(ifp), 1227 e); 1228 /* proceed anyway... */ 1229 } 1230 else 1231 ia->ia_flags &= ~IFA_ROUTE; 1232 } 1233 1234 /* Remove ownaddr's loopback rtentry, if it exists. */ 1235 in6_ifremloop(&(ia->ia_ifa)); 1236 1237 if (ifp->if_flags & IFF_MULTICAST) { 1238 /* 1239 * delete solicited multicast addr for deleting host id 1240 */ 1241 struct in6_multi *in6m; 1242 struct in6_addr llsol; 1243 bzero(&llsol, sizeof(struct in6_addr)); 1244 llsol.s6_addr16[0] = htons(0xff02); 1245 llsol.s6_addr16[1] = htons(ifp->if_index); 1246 llsol.s6_addr32[1] = 0; 1247 llsol.s6_addr32[2] = htonl(1); 1248 llsol.s6_addr32[3] = 1249 ia->ia_addr.sin6_addr.s6_addr32[3]; 1250 llsol.s6_addr8[12] = 0xff; 1251 1252 in6m = IN6_LOOKUP_MULTI(&llsol, ifp); 1253 if (in6m) 1254 in6_delmulti(in6m); 1255 } 1256 1257 in6_unlink_ifa(ia, ifp); 1258 } 1259 1260 static void 1261 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1262 { 1263 struct in6_ifaddr *oia; 1264 1265 crit_enter(); 1266 1267 ifa_ifunlink(&ia->ia_ifa, ifp); 1268 1269 oia = ia; 1270 if (oia == (ia = in6_ifaddr)) 1271 in6_ifaddr = ia->ia_next; 1272 else { 1273 while (ia->ia_next && (ia->ia_next != oia)) 1274 ia = ia->ia_next; 1275 if (ia->ia_next) 1276 ia->ia_next = oia->ia_next; 1277 else { 1278 /* search failed */ 1279 kprintf("Couldn't unlink in6_ifaddr from in6_ifaddr\n"); 1280 } 1281 } 1282 1283 /* 1284 * When an autoconfigured address is being removed, release the 1285 * reference to the base prefix. Also, since the release might 1286 * affect the status of other (detached) addresses, call 1287 * pfxlist_onlink_check(). 1288 */ 1289 if (oia->ia6_flags & IN6_IFF_AUTOCONF) { 1290 if (oia->ia6_ndpr == NULL) { 1291 log(LOG_NOTICE, "in6_unlink_ifa: autoconf'ed address " 1292 "%p has no prefix\n", oia); 1293 } else { 1294 oia->ia6_ndpr->ndpr_refcnt--; 1295 oia->ia6_flags &= ~IN6_IFF_AUTOCONF; 1296 oia->ia6_ndpr = NULL; 1297 } 1298 1299 pfxlist_onlink_check(); 1300 } 1301 1302 /* 1303 * release another refcnt for the link from in6_ifaddr. 1304 * Note that we should decrement the refcnt at least once for all *BSD. 1305 */ 1306 ifa_destroy(&oia->ia_ifa); 1307 1308 crit_exit(); 1309 } 1310 1311 void 1312 in6_purgeif(struct ifnet *ifp) 1313 { 1314 struct ifaddr_container *ifac, *next; 1315 1316 TAILQ_FOREACH_MUTABLE(ifac, &ifp->if_addrheads[mycpuid], 1317 ifa_link, next) { 1318 if (ifac->ifa->ifa_addr->sa_family != AF_INET6) 1319 continue; 1320 in6_purgeaddr(ifac->ifa); 1321 } 1322 1323 in6_ifdetach(ifp); 1324 } 1325 1326 /* 1327 * SIOC[GAD]LIFADDR. 1328 * SIOCGLIFADDR: get first address. (?) 1329 * SIOCGLIFADDR with IFLR_PREFIX: 1330 * get first address that matches the specified prefix. 1331 * SIOCALIFADDR: add the specified address. 1332 * SIOCALIFADDR with IFLR_PREFIX: 1333 * add the specified prefix, filling hostid part from 1334 * the first link-local address. prefixlen must be <= 64. 1335 * SIOCDLIFADDR: delete the specified address. 1336 * SIOCDLIFADDR with IFLR_PREFIX: 1337 * delete the first address that matches the specified prefix. 1338 * return values: 1339 * EINVAL on invalid parameters 1340 * EADDRNOTAVAIL on prefix match failed/specified address not found 1341 * other values may be returned from in6_ioctl() 1342 * 1343 * NOTE: SIOCALIFADDR(with IFLR_PREFIX set) allows prefixlen less than 64. 1344 * this is to accomodate address naming scheme other than RFC2374, 1345 * in the future. 1346 * RFC2373 defines interface id to be 64bit, but it allows non-RFC2374 1347 * address encoding scheme. (see figure on page 8) 1348 */ 1349 static int 1350 in6_lifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, 1351 struct thread *td) 1352 { 1353 struct if_laddrreq *iflr = (struct if_laddrreq *)data; 1354 struct sockaddr *sa; 1355 1356 /* sanity checks */ 1357 if (!data || !ifp) { 1358 panic("invalid argument to in6_lifaddr_ioctl"); 1359 /*NOTRECHED*/ 1360 } 1361 1362 switch (cmd) { 1363 case SIOCGLIFADDR: 1364 /* address must be specified on GET with IFLR_PREFIX */ 1365 if (!(iflr->flags & IFLR_PREFIX)) 1366 break; 1367 /* FALLTHROUGH */ 1368 case SIOCALIFADDR: 1369 case SIOCDLIFADDR: 1370 /* address must be specified on ADD and DELETE */ 1371 sa = (struct sockaddr *)&iflr->addr; 1372 if (sa->sa_family != AF_INET6) 1373 return EINVAL; 1374 if (sa->sa_len != sizeof(struct sockaddr_in6)) 1375 return EINVAL; 1376 /* XXX need improvement */ 1377 sa = (struct sockaddr *)&iflr->dstaddr; 1378 if (sa->sa_family && sa->sa_family != AF_INET6) 1379 return EINVAL; 1380 if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in6)) 1381 return EINVAL; 1382 break; 1383 default: /* shouldn't happen */ 1384 #if 0 1385 panic("invalid cmd to in6_lifaddr_ioctl"); 1386 /* NOTREACHED */ 1387 #else 1388 return EOPNOTSUPP; 1389 #endif 1390 } 1391 if (sizeof(struct in6_addr) * 8 < iflr->prefixlen) 1392 return EINVAL; 1393 1394 switch (cmd) { 1395 case SIOCALIFADDR: 1396 { 1397 struct in6_aliasreq ifra; 1398 struct in6_addr *hostid = NULL; 1399 int prefixlen; 1400 1401 if (iflr->flags & IFLR_PREFIX) { 1402 struct ifaddr *ifa; 1403 struct sockaddr_in6 *sin6; 1404 1405 /* 1406 * hostid is to fill in the hostid part of the 1407 * address. hostid points to the first link-local 1408 * address attached to the interface. 1409 */ 1410 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); 1411 if (!ifa) 1412 return EADDRNOTAVAIL; 1413 hostid = IFA_IN6(ifa); 1414 1415 /* prefixlen must be <= 64. */ 1416 if (64 < iflr->prefixlen) 1417 return EINVAL; 1418 prefixlen = iflr->prefixlen; 1419 1420 /* hostid part must be zero. */ 1421 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1422 if (sin6->sin6_addr.s6_addr32[2] != 0 1423 || sin6->sin6_addr.s6_addr32[3] != 0) { 1424 return EINVAL; 1425 } 1426 } else 1427 prefixlen = iflr->prefixlen; 1428 1429 /* copy args to in6_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */ 1430 bzero(&ifra, sizeof(ifra)); 1431 bcopy(iflr->iflr_name, ifra.ifra_name, 1432 sizeof(ifra.ifra_name)); 1433 1434 bcopy(&iflr->addr, &ifra.ifra_addr, 1435 ((struct sockaddr *)&iflr->addr)->sa_len); 1436 if (hostid) { 1437 /* fill in hostid part */ 1438 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 1439 hostid->s6_addr32[2]; 1440 ifra.ifra_addr.sin6_addr.s6_addr32[3] = 1441 hostid->s6_addr32[3]; 1442 } 1443 1444 if (((struct sockaddr *)&iflr->dstaddr)->sa_family) { /*XXX*/ 1445 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr, 1446 ((struct sockaddr *)&iflr->dstaddr)->sa_len); 1447 if (hostid) { 1448 ifra.ifra_dstaddr.sin6_addr.s6_addr32[2] = 1449 hostid->s6_addr32[2]; 1450 ifra.ifra_dstaddr.sin6_addr.s6_addr32[3] = 1451 hostid->s6_addr32[3]; 1452 } 1453 } 1454 1455 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1456 in6_prefixlen2mask(&ifra.ifra_prefixmask.sin6_addr, prefixlen); 1457 1458 ifra.ifra_flags = iflr->flags & ~IFLR_PREFIX; 1459 return in6_control_internal(SIOCAIFADDR_IN6, (caddr_t)&ifra, 1460 ifp, td); 1461 } 1462 case SIOCGLIFADDR: 1463 case SIOCDLIFADDR: 1464 { 1465 struct ifaddr_container *ifac; 1466 struct in6_ifaddr *ia; 1467 struct in6_addr mask, candidate, match; 1468 struct sockaddr_in6 *sin6; 1469 int cmp; 1470 1471 bzero(&mask, sizeof(mask)); 1472 if (iflr->flags & IFLR_PREFIX) { 1473 /* lookup a prefix rather than address. */ 1474 in6_prefixlen2mask(&mask, iflr->prefixlen); 1475 1476 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1477 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1478 match.s6_addr32[0] &= mask.s6_addr32[0]; 1479 match.s6_addr32[1] &= mask.s6_addr32[1]; 1480 match.s6_addr32[2] &= mask.s6_addr32[2]; 1481 match.s6_addr32[3] &= mask.s6_addr32[3]; 1482 1483 /* if you set extra bits, that's wrong */ 1484 if (bcmp(&match, &sin6->sin6_addr, sizeof(match))) 1485 return EINVAL; 1486 1487 cmp = 1; 1488 } else { 1489 if (cmd == SIOCGLIFADDR) { 1490 /* on getting an address, take the 1st match */ 1491 cmp = 0; /* XXX */ 1492 } else { 1493 /* on deleting an address, do exact match */ 1494 in6_prefixlen2mask(&mask, 128); 1495 sin6 = (struct sockaddr_in6 *)&iflr->addr; 1496 bcopy(&sin6->sin6_addr, &match, sizeof(match)); 1497 1498 cmp = 1; 1499 } 1500 } 1501 1502 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1503 struct ifaddr *ifa = ifac->ifa; 1504 1505 if (ifa->ifa_addr->sa_family != AF_INET6) 1506 continue; 1507 if (!cmp) 1508 break; 1509 1510 bcopy(IFA_IN6(ifa), &candidate, sizeof(candidate)); 1511 /* 1512 * XXX: this is adhoc, but is necessary to allow 1513 * a user to specify fe80::/64 (not /10) for a 1514 * link-local address. 1515 */ 1516 if (IN6_IS_ADDR_LINKLOCAL(&candidate)) 1517 candidate.s6_addr16[1] = 0; 1518 candidate.s6_addr32[0] &= mask.s6_addr32[0]; 1519 candidate.s6_addr32[1] &= mask.s6_addr32[1]; 1520 candidate.s6_addr32[2] &= mask.s6_addr32[2]; 1521 candidate.s6_addr32[3] &= mask.s6_addr32[3]; 1522 if (IN6_ARE_ADDR_EQUAL(&candidate, &match)) 1523 break; 1524 } 1525 if (ifac == NULL) 1526 return EADDRNOTAVAIL; 1527 ia = ifa2ia6(ifac->ifa); 1528 1529 if (cmd == SIOCGLIFADDR) { 1530 struct sockaddr_in6 *s6; 1531 1532 /* fill in the if_laddrreq structure */ 1533 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin6_len); 1534 s6 = (struct sockaddr_in6 *)&iflr->addr; 1535 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) { 1536 s6->sin6_addr.s6_addr16[1] = 0; 1537 if (in6_addr2zoneid(ifp, &s6->sin6_addr, 1538 &s6->sin6_scope_id)) 1539 return (EINVAL);/* XXX */ 1540 } 1541 if (ifp->if_flags & IFF_POINTOPOINT) { 1542 bcopy(&ia->ia_dstaddr, &iflr->dstaddr, 1543 ia->ia_dstaddr.sin6_len); 1544 s6 = (struct sockaddr_in6 *)&iflr->dstaddr; 1545 if (IN6_IS_ADDR_LINKLOCAL(&s6->sin6_addr)) { 1546 s6->sin6_addr.s6_addr16[1] = 0; 1547 if (in6_addr2zoneid(ifp, 1548 &s6->sin6_addr, &s6->sin6_scope_id)) 1549 return (EINVAL); /* EINVAL */ 1550 } 1551 } else 1552 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr)); 1553 1554 iflr->prefixlen = 1555 in6_mask2len(&ia->ia_prefixmask.sin6_addr, 1556 NULL); 1557 1558 iflr->flags = ia->ia6_flags; /* XXX */ 1559 1560 return 0; 1561 } else { 1562 struct in6_aliasreq ifra; 1563 1564 /* fill in6_aliasreq and do ioctl(SIOCDIFADDR_IN6) */ 1565 bzero(&ifra, sizeof(ifra)); 1566 bcopy(iflr->iflr_name, ifra.ifra_name, 1567 sizeof(ifra.ifra_name)); 1568 1569 bcopy(&ia->ia_addr, &ifra.ifra_addr, 1570 ia->ia_addr.sin6_len); 1571 if (ifp->if_flags & IFF_POINTOPOINT) 1572 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr, 1573 ia->ia_dstaddr.sin6_len); 1574 else 1575 bzero(&ifra.ifra_dstaddr, 1576 sizeof(ifra.ifra_dstaddr)); 1577 bcopy(&ia->ia_prefixmask, &ifra.ifra_dstaddr, 1578 ia->ia_prefixmask.sin6_len); 1579 1580 ifra.ifra_flags = ia->ia6_flags; 1581 return in6_control_internal(SIOCDIFADDR_IN6, 1582 (caddr_t)&ifra, ifp, td); 1583 } 1584 } 1585 } 1586 1587 return EOPNOTSUPP; /* just for safety */ 1588 } 1589 1590 /* 1591 * Initialize an interface's intetnet6 address 1592 * and routing table entry. 1593 */ 1594 static int 1595 in6_ifinit(struct ifnet *ifp, struct in6_ifaddr *ia, struct sockaddr_in6 *sin6, 1596 int newhost) 1597 { 1598 int error = 0, plen; 1599 1600 ia->ia_addr = *sin6; 1601 1602 if (ifp->if_ioctl != NULL) { 1603 ifnet_serialize_all(ifp); 1604 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL); 1605 ifnet_deserialize_all(ifp); 1606 if (error) 1607 return (error); 1608 } 1609 1610 ia->ia_ifa.ifa_metric = ifp->if_metric; 1611 1612 /* we could do in(6)_socktrim here, but just omit it at this moment. */ 1613 1614 /* 1615 * Special case: 1616 * If the destination address is specified for a point-to-point 1617 * interface, install a route to the destination as an interface 1618 * direct route. 1619 */ 1620 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1621 if (plen == 128 && ia->ia_dstaddr.sin6_family == AF_INET6) { 1622 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, 1623 RTF_UP | RTF_HOST)) != 0) 1624 return (error); 1625 ia->ia_flags |= IFA_ROUTE; 1626 } 1627 if (plen < 128) { 1628 /* 1629 * The RTF_CLONING flag is necessary for in6_is_ifloop_auto(). 1630 */ 1631 ia->ia_ifa.ifa_flags |= RTF_CLONING; 1632 } 1633 1634 /* Add ownaddr as loopback rtentry, if necessary (ex. on p2p link). */ 1635 if (newhost) { 1636 /* set the rtrequest function to create llinfo */ 1637 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 1638 in6_ifaddloop(&(ia->ia_ifa)); 1639 } 1640 1641 return (error); 1642 } 1643 1644 struct in6_multi_mship * 1645 in6_joingroup(struct ifnet *ifp, struct in6_addr *addr, int *errorp) 1646 { 1647 struct in6_multi_mship *imm; 1648 1649 imm = kmalloc(sizeof(*imm), M_IPMADDR, M_NOWAIT); 1650 if (!imm) { 1651 *errorp = ENOBUFS; 1652 return NULL; 1653 } 1654 imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp); 1655 if (!imm->i6mm_maddr) { 1656 /* *errorp is alrady set */ 1657 kfree(imm, M_IPMADDR); 1658 return NULL; 1659 } 1660 return imm; 1661 } 1662 1663 int 1664 in6_leavegroup(struct in6_multi_mship *imm) 1665 { 1666 1667 if (imm->i6mm_maddr) 1668 in6_delmulti(imm->i6mm_maddr); 1669 kfree(imm, M_IPMADDR); 1670 return 0; 1671 } 1672 1673 /* 1674 * Add an address to the list of IP6 multicast addresses for a 1675 * given interface. 1676 */ 1677 struct in6_multi * 1678 in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp, int *errorp) 1679 { 1680 struct in6_multi *in6m; 1681 struct sockaddr_in6 sin6; 1682 struct ifmultiaddr *ifma; 1683 1684 *errorp = 0; 1685 1686 crit_enter(); 1687 1688 /* 1689 * Call generic routine to add membership or increment 1690 * refcount. It wants addresses in the form of a sockaddr, 1691 * so we build one here (being careful to zero the unused bytes). 1692 */ 1693 bzero(&sin6, sizeof sin6); 1694 sin6.sin6_family = AF_INET6; 1695 sin6.sin6_len = sizeof sin6; 1696 sin6.sin6_addr = *maddr6; 1697 *errorp = if_addmulti(ifp, (struct sockaddr *)&sin6, &ifma); 1698 if (*errorp) { 1699 crit_exit(); 1700 return 0; 1701 } 1702 1703 /* 1704 * If ifma->ifma_protospec is null, then if_addmulti() created 1705 * a new record. Otherwise, we are done. 1706 */ 1707 if (ifma->ifma_protospec != NULL) { 1708 crit_exit(); 1709 return ifma->ifma_protospec; 1710 } 1711 1712 in6m = kmalloc(sizeof(*in6m), M_IPMADDR, M_INTWAIT | M_ZERO); 1713 in6m->in6m_addr = *maddr6; 1714 in6m->in6m_ifp = ifp; 1715 in6m->in6m_ifma = ifma; 1716 ifma->ifma_protospec = in6m; 1717 LIST_INSERT_HEAD(&in6_multihead, in6m, in6m_entry); 1718 1719 /* 1720 * Let MLD6 know that we have joined a new IP6 multicast 1721 * group. 1722 */ 1723 mld6_start_listening(in6m); 1724 crit_exit(); 1725 return (in6m); 1726 } 1727 1728 /* 1729 * Delete a multicast address record. 1730 */ 1731 void 1732 in6_delmulti(struct in6_multi *in6m) 1733 { 1734 struct ifmultiaddr *ifma = in6m->in6m_ifma; 1735 1736 crit_enter(); 1737 1738 if (ifma->ifma_refcount == 1) { 1739 /* 1740 * No remaining claims to this record; let MLD6 know 1741 * that we are leaving the multicast group. 1742 */ 1743 mld6_stop_listening(in6m); 1744 ifma->ifma_protospec = NULL; 1745 LIST_REMOVE(in6m, in6m_entry); 1746 kfree(in6m, M_IPMADDR); 1747 } 1748 /* XXX - should be separate API for when we have an ifma? */ 1749 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr); 1750 crit_exit(); 1751 } 1752 1753 /* 1754 * Find an IPv6 interface link-local address specific to an interface. 1755 */ 1756 struct in6_ifaddr * 1757 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1758 { 1759 const struct ifaddr_container *ifac; 1760 1761 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1762 struct ifaddr *ifa = ifac->ifa; 1763 1764 if (ifa->ifa_addr == NULL) 1765 continue; /* just for safety */ 1766 if (ifa->ifa_addr->sa_family != AF_INET6) 1767 continue; 1768 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1769 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1770 ignoreflags) != 0) 1771 continue; 1772 return (struct in6_ifaddr *)ifa; 1773 } 1774 } 1775 return NULL; 1776 } 1777 1778 1779 /* 1780 * find the internet address corresponding to a given interface and address. 1781 */ 1782 struct in6_ifaddr * 1783 in6ifa_ifpwithaddr(struct ifnet *ifp, struct in6_addr *addr) 1784 { 1785 const struct ifaddr_container *ifac; 1786 1787 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1788 struct ifaddr *ifa = ifac->ifa; 1789 1790 if (ifa->ifa_addr == NULL) 1791 continue; /* just for safety */ 1792 if (ifa->ifa_addr->sa_family != AF_INET6) 1793 continue; 1794 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) 1795 return (struct in6_ifaddr *)ifa; 1796 } 1797 return NULL; 1798 } 1799 1800 /* 1801 * Find a link-local scoped address on ifp and return it if any. 1802 */ 1803 struct in6_ifaddr * 1804 in6ifa_llaonifp(struct ifnet *ifp) 1805 { 1806 const struct ifaddr_container *ifac; 1807 1808 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1809 const struct sockaddr_in6 *sin6; 1810 struct ifaddr *ifa = ifac->ifa; 1811 1812 if (ifa->ifa_addr->sa_family != AF_INET6) 1813 continue; 1814 sin6 = (const struct sockaddr_in6 *)ifa->ifa_addr; 1815 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 1816 /* XXX why are mcast addresses ifp address list? */ 1817 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) || 1818 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr)) 1819 return (struct in6_ifaddr *)ifa; 1820 } 1821 return NULL; 1822 } 1823 1824 /* 1825 * find the internet address on a given interface corresponding to a neighbor's 1826 * address. 1827 */ 1828 struct in6_ifaddr * 1829 in6ifa_ifplocaladdr(const struct ifnet *ifp, const struct in6_addr *addr) 1830 { 1831 struct ifaddr *ifa; 1832 struct in6_ifaddr *ia; 1833 struct ifaddr_container *ifac; 1834 1835 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1836 ifa = ifac->ifa; 1837 1838 if (ifa->ifa_addr == NULL) 1839 continue; /* just for safety */ 1840 if (ifa->ifa_addr->sa_family != AF_INET6) 1841 continue; 1842 ia = (struct in6_ifaddr *)ifa; 1843 if (IN6_ARE_MASKED_ADDR_EQUAL(addr, 1844 &ia->ia_addr.sin6_addr, 1845 &ia->ia_prefixmask.sin6_addr)) 1846 return ia; 1847 } 1848 1849 return NULL; 1850 } 1851 1852 /* 1853 * Convert IP6 address to printable (loggable) representation. 1854 */ 1855 static char digits[] = "0123456789abcdef"; 1856 static int ip6round = 0; 1857 char * 1858 ip6_sprintf(const struct in6_addr *addr) 1859 { 1860 static char ip6buf[8][48]; 1861 int i; 1862 char *cp; 1863 const u_short *a = (const u_short *)addr; 1864 const u_char *d; 1865 int dcolon = 0; 1866 1867 ip6round = (ip6round + 1) & 7; 1868 cp = ip6buf[ip6round]; 1869 1870 for (i = 0; i < 8; i++) { 1871 if (dcolon == 1) { 1872 if (*a == 0) { 1873 if (i == 7) 1874 *cp++ = ':'; 1875 a++; 1876 continue; 1877 } else 1878 dcolon = 2; 1879 } 1880 if (*a == 0) { 1881 if (dcolon == 0 && *(a + 1) == 0) { 1882 if (i == 0) 1883 *cp++ = ':'; 1884 *cp++ = ':'; 1885 dcolon = 1; 1886 } else { 1887 *cp++ = '0'; 1888 *cp++ = ':'; 1889 } 1890 a++; 1891 continue; 1892 } 1893 d = (const u_char *)a; 1894 *cp++ = digits[*d >> 4]; 1895 *cp++ = digits[*d++ & 0xf]; 1896 *cp++ = digits[*d >> 4]; 1897 *cp++ = digits[*d & 0xf]; 1898 *cp++ = ':'; 1899 a++; 1900 } 1901 *--cp = 0; 1902 return (ip6buf[ip6round]); 1903 } 1904 1905 int 1906 in6_localaddr(struct in6_addr *in6) 1907 { 1908 struct in6_ifaddr *ia; 1909 1910 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1911 return 1; 1912 1913 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 1914 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1915 &ia->ia_prefixmask.sin6_addr)) 1916 return 1; 1917 1918 return (0); 1919 } 1920 1921 int 1922 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1923 { 1924 struct in6_ifaddr *ia; 1925 1926 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 1927 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, 1928 &sa6->sin6_addr) && 1929 (ia->ia6_flags & IN6_IFF_DEPRECATED)) 1930 return (1); /* true */ 1931 1932 /* XXX: do we still have to go thru the rest of the list? */ 1933 } 1934 1935 return (0); /* false */ 1936 } 1937 1938 /* 1939 * return length of part which dst and src are equal 1940 * hard coding... 1941 */ 1942 int 1943 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1944 { 1945 int match = 0; 1946 u_char *s = (u_char *)src, *d = (u_char *)dst; 1947 u_char *lim = s + 16, r; 1948 1949 while (s < lim) 1950 if ((r = (*d++ ^ *s++)) != 0) { 1951 while (r < 128) { 1952 match++; 1953 r <<= 1; 1954 } 1955 break; 1956 } else 1957 match += 8; 1958 return match; 1959 } 1960 1961 /* XXX: to be scope conscious */ 1962 int 1963 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1964 { 1965 int bytelen, bitlen; 1966 1967 /* sanity check */ 1968 if (0 > len || len > 128) { 1969 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1970 len); 1971 return (0); 1972 } 1973 1974 bytelen = len / 8; 1975 bitlen = len % 8; 1976 1977 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1978 return (0); 1979 if (p1->s6_addr[bytelen] >> (8 - bitlen) != 1980 p2->s6_addr[bytelen] >> (8 - bitlen)) 1981 return (0); 1982 1983 return (1); 1984 } 1985 1986 void 1987 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1988 { 1989 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1990 int bytelen, bitlen, i; 1991 1992 /* sanity check */ 1993 if (0 > len || len > 128) { 1994 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1995 len); 1996 return; 1997 } 1998 1999 bzero(maskp, sizeof(*maskp)); 2000 bytelen = len / 8; 2001 bitlen = len % 8; 2002 for (i = 0; i < bytelen; i++) 2003 maskp->s6_addr[i] = 0xff; 2004 if (bitlen) 2005 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 2006 } 2007 2008 /* 2009 * return the best address out of the same scope 2010 */ 2011 struct in6_ifaddr * 2012 in6_ifawithscope(struct ifnet *oifp, struct in6_addr *dst, struct ucred *cred) 2013 { 2014 int dst_scope = in6_addrscope(dst), src_scope, best_scope = 0; 2015 int blen = -1; 2016 struct in6_ifaddr *ifa_best = NULL; 2017 u_int32_t dstzone, odstzone; 2018 int jailed = 0; 2019 const struct ifnet_array *arr; 2020 int i; 2021 2022 if(cred && cred->cr_prison) 2023 jailed = 1; 2024 2025 if (oifp == NULL) 2026 return (NULL); 2027 2028 if (in6_addr2zoneid(oifp, dst, &odstzone)) 2029 return (NULL); 2030 2031 /* 2032 * We search for all addresses on all interfaces from the beginning. 2033 * Comparing an interface with the outgoing interface will be done 2034 * only at the final stage of tiebreaking. 2035 */ 2036 arr = ifnet_array_get(); 2037 for (i = 0; i < arr->ifnet_count; ++i) { 2038 struct ifnet *ifp = arr->ifnet_arr[i]; 2039 struct ifaddr_container *ifac; 2040 2041 /* 2042 * We can never take an address that breaks the scope zone 2043 * of the destination. 2044 */ 2045 if (ifp->if_afdata[AF_INET6] == NULL) 2046 continue; 2047 if (in6_addr2zoneid(ifp, dst, &dstzone) || dstzone != odstzone) 2048 continue; 2049 2050 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2051 int tlen = -1, dscopecmp, bscopecmp, matchcmp; 2052 struct ifaddr *ifa = ifac->ifa; 2053 2054 if (ifa->ifa_addr->sa_family != AF_INET6) 2055 continue; 2056 2057 src_scope = in6_addrscope(IFA_IN6(ifa)); 2058 2059 /* 2060 * Don't use an address before completing DAD 2061 * nor a duplicated address. 2062 */ 2063 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2064 IN6_IFF_NOTREADY) 2065 continue; 2066 2067 /* XXX: is there any case to allow anycasts? */ 2068 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2069 IN6_IFF_ANYCAST) 2070 continue; 2071 2072 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2073 IN6_IFF_DETACHED) 2074 continue; 2075 2076 /* Skip adresses not valid for current jail */ 2077 if (jailed && 2078 !(jailed_ip(cred->cr_prison, (struct sockaddr *)(ifa->ifa_addr)) != 0)) 2079 continue; 2080 2081 /* 2082 * If this is the first address we find, 2083 * keep it anyway. 2084 */ 2085 if (ifa_best == NULL) 2086 goto replace; 2087 2088 /* 2089 * ifa_best is never NULL beyond this line except 2090 * within the block labeled "replace". 2091 */ 2092 2093 /* 2094 * If ifa_best has a smaller scope than dst and 2095 * the current address has a larger one than 2096 * (or equal to) dst, always replace ifa_best. 2097 * Also, if the current address has a smaller scope 2098 * than dst, ignore it unless ifa_best also has a 2099 * smaller scope. 2100 * Consequently, after the two if-clause below, 2101 * the followings must be satisfied: 2102 * (scope(src) < scope(dst) && 2103 * scope(best) < scope(dst)) 2104 * OR 2105 * (scope(best) >= scope(dst) && 2106 * scope(src) >= scope(dst)) 2107 */ 2108 if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0 && 2109 IN6_ARE_SCOPE_CMP(src_scope, dst_scope) >= 0) 2110 goto replace; /* (A) */ 2111 if (IN6_ARE_SCOPE_CMP(src_scope, dst_scope) < 0 && 2112 IN6_ARE_SCOPE_CMP(best_scope, dst_scope) >= 0) 2113 continue; /* (B) */ 2114 2115 /* 2116 * A deprecated address SHOULD NOT be used in new 2117 * communications if an alternate (non-deprecated) 2118 * address is available and has sufficient scope. 2119 * RFC 2462, Section 5.5.4. 2120 */ 2121 if (((struct in6_ifaddr *)ifa)->ia6_flags & 2122 IN6_IFF_DEPRECATED) { 2123 /* 2124 * Ignore any deprecated addresses if 2125 * specified by configuration. 2126 */ 2127 if (!ip6_use_deprecated) 2128 continue; 2129 2130 /* 2131 * If we have already found a non-deprecated 2132 * candidate, just ignore deprecated addresses. 2133 */ 2134 if (!(ifa_best->ia6_flags & IN6_IFF_DEPRECATED)) 2135 continue; 2136 } 2137 2138 /* 2139 * A non-deprecated address is always preferred 2140 * to a deprecated one regardless of scopes and 2141 * address matching (Note invariants ensured by the 2142 * conditions (A) and (B) above.) 2143 */ 2144 if ((ifa_best->ia6_flags & IN6_IFF_DEPRECATED) && 2145 !(((struct in6_ifaddr *)ifa)->ia6_flags & 2146 IN6_IFF_DEPRECATED)) 2147 goto replace; 2148 2149 /* 2150 * When we use temporary addresses described in 2151 * RFC 3041, we prefer temporary addresses to 2152 * public autoconf addresses. Again, note the 2153 * invariants from (A) and (B). Also note that we 2154 * don't have any preference between static addresses 2155 * and autoconf addresses (despite of whether or not 2156 * the latter is temporary or public.) 2157 */ 2158 if (ip6_use_tempaddr) { 2159 struct in6_ifaddr *ifat; 2160 2161 ifat = (struct in6_ifaddr *)ifa; 2162 if ((ifa_best->ia6_flags & 2163 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2164 == IN6_IFF_AUTOCONF && 2165 (ifat->ia6_flags & 2166 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2167 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) { 2168 goto replace; 2169 } 2170 if ((ifa_best->ia6_flags & 2171 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2172 == (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY) && 2173 (ifat->ia6_flags & 2174 (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) 2175 == IN6_IFF_AUTOCONF) { 2176 continue; 2177 } 2178 } 2179 2180 /* 2181 * At this point, we have two cases: 2182 * 1. we are looking at a non-deprecated address, 2183 * and ifa_best is also non-deprecated. 2184 * 2. we are looking at a deprecated address, 2185 * and ifa_best is also deprecated. 2186 * Also, we do not have to consider a case where 2187 * the scope of if_best is larger(smaller) than dst and 2188 * the scope of the current address is smaller(larger) 2189 * than dst. Such a case has already been covered. 2190 * Tiebreaking is done according to the following 2191 * items: 2192 * - the scope comparison between the address and 2193 * dst (dscopecmp) 2194 * - the scope comparison between the address and 2195 * ifa_best (bscopecmp) 2196 * - if the address match dst longer than ifa_best 2197 * (matchcmp) 2198 * - if the address is on the outgoing I/F (outI/F) 2199 * 2200 * Roughly speaking, the selection policy is 2201 * - the most important item is scope. The same scope 2202 * is best. Then search for a larger scope. 2203 * Smaller scopes are the last resort. 2204 * - A deprecated address is chosen only when we have 2205 * no address that has an enough scope, but is 2206 * prefered to any addresses of smaller scopes 2207 * (this must be already done above.) 2208 * - addresses on the outgoing I/F are preferred to 2209 * ones on other interfaces if none of above 2210 * tiebreaks. In the table below, the column "bI" 2211 * means if the best_ifa is on the outgoing 2212 * interface, and the column "sI" means if the ifa 2213 * is on the outgoing interface. 2214 * - If there is no other reasons to choose one, 2215 * longest address match against dst is considered. 2216 * 2217 * The precise decision table is as follows: 2218 * dscopecmp bscopecmp match bI oI | replace? 2219 * N/A equal N/A Y N | No (1) 2220 * N/A equal N/A N Y | Yes (2) 2221 * N/A equal larger N/A | Yes (3) 2222 * N/A equal !larger N/A | No (4) 2223 * larger larger N/A N/A | No (5) 2224 * larger smaller N/A N/A | Yes (6) 2225 * smaller larger N/A N/A | Yes (7) 2226 * smaller smaller N/A N/A | No (8) 2227 * equal smaller N/A N/A | Yes (9) 2228 * equal larger (already done at A above) 2229 */ 2230 dscopecmp = IN6_ARE_SCOPE_CMP(src_scope, dst_scope); 2231 bscopecmp = IN6_ARE_SCOPE_CMP(src_scope, best_scope); 2232 2233 if (bscopecmp == 0) { 2234 struct ifnet *bifp = ifa_best->ia_ifp; 2235 2236 if (bifp == oifp && ifp != oifp) /* (1) */ 2237 continue; 2238 if (bifp != oifp && ifp == oifp) /* (2) */ 2239 goto replace; 2240 2241 /* 2242 * Both bifp and ifp are on the outgoing 2243 * interface, or both two are on a different 2244 * interface from the outgoing I/F. 2245 * now we need address matching against dst 2246 * for tiebreaking. 2247 */ 2248 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2249 matchcmp = tlen - blen; 2250 if (matchcmp > 0) /* (3) */ 2251 goto replace; 2252 continue; /* (4) */ 2253 } 2254 if (dscopecmp > 0) { 2255 if (bscopecmp > 0) /* (5) */ 2256 continue; 2257 goto replace; /* (6) */ 2258 } 2259 if (dscopecmp < 0) { 2260 if (bscopecmp > 0) /* (7) */ 2261 goto replace; 2262 continue; /* (8) */ 2263 } 2264 2265 /* now dscopecmp must be 0 */ 2266 if (bscopecmp < 0) 2267 goto replace; /* (9) */ 2268 2269 replace: 2270 ifa_best = (struct in6_ifaddr *)ifa; 2271 blen = tlen >= 0 ? tlen : 2272 in6_matchlen(IFA_IN6(ifa), dst); 2273 best_scope = in6_addrscope(&ifa_best->ia_addr.sin6_addr); 2274 } 2275 } 2276 2277 /* count statistics for future improvements */ 2278 if (ifa_best == NULL) 2279 ip6stat.ip6s_sources_none++; 2280 else { 2281 if (oifp == ifa_best->ia_ifp) 2282 ip6stat.ip6s_sources_sameif[best_scope]++; 2283 else 2284 ip6stat.ip6s_sources_otherif[best_scope]++; 2285 2286 if (best_scope == dst_scope) 2287 ip6stat.ip6s_sources_samescope[best_scope]++; 2288 else 2289 ip6stat.ip6s_sources_otherscope[best_scope]++; 2290 2291 if (ifa_best->ia6_flags & IN6_IFF_DEPRECATED) 2292 ip6stat.ip6s_sources_deprecated[best_scope]++; 2293 } 2294 2295 return (ifa_best); 2296 } 2297 2298 /* 2299 * return the best address out of the same scope. if no address was 2300 * found, return the first valid address from designated IF. 2301 */ 2302 struct in6_ifaddr * 2303 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 2304 { 2305 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 2306 struct ifaddr_container *ifac; 2307 struct in6_ifaddr *besta = NULL; 2308 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 2309 2310 dep[0] = dep[1] = NULL; 2311 2312 /* 2313 * We first look for addresses in the same scope. 2314 * If there is one, return it. 2315 * If two or more, return one which matches the dst longest. 2316 * If none, return one of global addresses assigned other ifs. 2317 */ 2318 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2319 struct ifaddr *ifa = ifac->ifa; 2320 2321 if (ifa->ifa_addr->sa_family != AF_INET6) 2322 continue; 2323 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2324 continue; /* XXX: is there any case to allow anycast? */ 2325 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2326 continue; /* don't use this interface */ 2327 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2328 continue; 2329 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2330 if (ip6_use_deprecated) 2331 dep[0] = (struct in6_ifaddr *)ifa; 2332 continue; 2333 } 2334 2335 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 2336 /* 2337 * call in6_matchlen() as few as possible 2338 */ 2339 if (besta) { 2340 if (blen == -1) 2341 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 2342 tlen = in6_matchlen(IFA_IN6(ifa), dst); 2343 if (tlen > blen) { 2344 blen = tlen; 2345 besta = (struct in6_ifaddr *)ifa; 2346 } 2347 } else 2348 besta = (struct in6_ifaddr *)ifa; 2349 } 2350 } 2351 if (besta) 2352 return (besta); 2353 2354 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2355 struct ifaddr *ifa = ifac->ifa; 2356 2357 if (ifa->ifa_addr->sa_family != AF_INET6) 2358 continue; 2359 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 2360 continue; /* XXX: is there any case to allow anycast? */ 2361 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 2362 continue; /* don't use this interface */ 2363 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 2364 continue; 2365 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 2366 if (ip6_use_deprecated) 2367 dep[1] = (struct in6_ifaddr *)ifa; 2368 continue; 2369 } 2370 2371 return (struct in6_ifaddr *)ifa; 2372 } 2373 2374 /* use the last-resort values, that are, deprecated addresses */ 2375 if (dep[0]) 2376 return dep[0]; 2377 if (dep[1]) 2378 return dep[1]; 2379 2380 return NULL; 2381 } 2382 2383 /* 2384 * perform DAD when interface becomes IFF_UP. 2385 */ 2386 static void 2387 in6_if_up_dispatch(netmsg_t nmsg) 2388 { 2389 struct ifnet *ifp = nmsg->lmsg.u.ms_resultp; 2390 struct ifaddr_container *ifac; 2391 struct in6_ifaddr *ia; 2392 int dad_delay; /* delay ticks before DAD output */ 2393 2394 ASSERT_NETISR0; 2395 2396 /* 2397 * special cases, like 6to4, are handled in in6_ifattach 2398 */ 2399 in6_ifattach(ifp, NULL); 2400 2401 dad_delay = 0; 2402 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 2403 struct ifaddr *ifa = ifac->ifa; 2404 2405 if (ifa->ifa_addr->sa_family != AF_INET6) 2406 continue; 2407 ia = (struct in6_ifaddr *)ifa; 2408 if (ia->ia6_flags & IN6_IFF_TENTATIVE) 2409 nd6_dad_start(ifa, &dad_delay); 2410 } 2411 2412 netisr_replymsg(&nmsg->base, 0); 2413 } 2414 2415 void 2416 in6_if_up(struct ifnet *ifp) 2417 { 2418 struct netmsg_base nmsg; 2419 2420 netmsg_init(&nmsg, NULL, &curthread->td_msgport, 0, in6_if_up_dispatch); 2421 nmsg.lmsg.u.ms_resultp = ifp; 2422 netisr_domsg(&nmsg, 0); 2423 } 2424 2425 int 2426 in6if_do_dad(struct ifnet *ifp) 2427 { 2428 if (ifp->if_flags & IFF_LOOPBACK) 2429 return (0); 2430 2431 switch (ifp->if_type) { 2432 #ifdef IFT_DUMMY 2433 case IFT_DUMMY: 2434 return (0); 2435 #endif 2436 default: 2437 /* 2438 * Our DAD routine requires the interface up and running. 2439 * However, some interfaces can be up before the RUNNING 2440 * status. Additionaly, users may try to assign addresses 2441 * before the interface becomes up (or running). 2442 * We simply skip DAD in such a case as a work around. 2443 * XXX: we should rather mark "tentative" on such addresses, 2444 * and do DAD after the interface becomes ready. 2445 */ 2446 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != 2447 (IFF_UP|IFF_RUNNING)) 2448 return (0); 2449 2450 return (1); 2451 } 2452 } 2453 2454 /* 2455 * Calculate max IPv6 MTU through all the interfaces and store it 2456 * to in6_maxmtu. 2457 */ 2458 void 2459 in6_setmaxmtu(void) 2460 { 2461 unsigned long maxmtu = 0; 2462 const struct ifnet_array *arr; 2463 int i; 2464 2465 ASSERT_NETISR0; 2466 2467 arr = ifnet_array_get(); 2468 for (i = 0; i < arr->ifnet_count; ++i) { 2469 struct ifnet *ifp = arr->ifnet_arr[i]; 2470 2471 /* this function can be called during ifnet initialization */ 2472 if (ifp->if_afdata[AF_INET6] == NULL) 2473 continue; 2474 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 2475 IN6_LINKMTU(ifp) > maxmtu) 2476 maxmtu = IN6_LINKMTU(ifp); 2477 } 2478 if (maxmtu) /* update only when maxmtu is positive */ 2479 in6_maxmtu = maxmtu; 2480 } 2481 2482 void * 2483 in6_domifattach(struct ifnet *ifp) 2484 { 2485 struct in6_ifextra *ext; 2486 2487 ext = (struct in6_ifextra *)kmalloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2488 bzero(ext, sizeof(*ext)); 2489 2490 ext->in6_ifstat = (struct in6_ifstat *)kmalloc(sizeof(struct in6_ifstat), 2491 M_IFADDR, M_WAITOK); 2492 bzero(ext->in6_ifstat, sizeof(*ext->in6_ifstat)); 2493 2494 ext->icmp6_ifstat = 2495 (struct icmp6_ifstat *)kmalloc(sizeof(struct icmp6_ifstat), 2496 M_IFADDR, M_WAITOK); 2497 bzero(ext->icmp6_ifstat, sizeof(*ext->icmp6_ifstat)); 2498 2499 ext->nd_ifinfo = nd6_ifattach(ifp); 2500 ext->scope6_id = scope6_ifattach(ifp); 2501 return ext; 2502 } 2503 2504 void 2505 in6_domifdetach(struct ifnet *ifp, void *aux) 2506 { 2507 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2508 scope6_ifdetach(ext->scope6_id); 2509 nd6_ifdetach(ext->nd_ifinfo); 2510 kfree(ext->in6_ifstat, M_IFADDR); 2511 kfree(ext->icmp6_ifstat, M_IFADDR); 2512 kfree(ext, M_IFADDR); 2513 } 2514