1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $ 32 */ 33 34 /*- 35 * Copyright (c) 1982, 1986, 1991, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * @(#)in.c 8.2 (Berkeley) 11/15/93 63 */ 64 65 #include <sys/cdefs.h> 66 __FBSDID("$FreeBSD$"); 67 68 #include "opt_inet.h" 69 #include "opt_inet6.h" 70 71 #include <sys/param.h> 72 #include <sys/eventhandler.h> 73 #include <sys/errno.h> 74 #include <sys/jail.h> 75 #include <sys/malloc.h> 76 #include <sys/socket.h> 77 #include <sys/socketvar.h> 78 #include <sys/sockio.h> 79 #include <sys/systm.h> 80 #include <sys/priv.h> 81 #include <sys/proc.h> 82 #include <sys/protosw.h> 83 #include <sys/time.h> 84 #include <sys/kernel.h> 85 #include <sys/lock.h> 86 #include <sys/rmlock.h> 87 #include <sys/syslog.h> 88 89 #include <net/if.h> 90 #include <net/if_var.h> 91 #include <net/if_types.h> 92 #include <net/route.h> 93 #include <net/if_dl.h> 94 #include <net/vnet.h> 95 96 #include <netinet/in.h> 97 #include <netinet/in_var.h> 98 #include <net/if_llatbl.h> 99 #include <netinet/if_ether.h> 100 #include <netinet/in_systm.h> 101 #include <netinet/ip.h> 102 #include <netinet/in_pcb.h> 103 #include <netinet/ip_carp.h> 104 105 #include <netinet/ip6.h> 106 #include <netinet6/ip6_var.h> 107 #include <netinet6/nd6.h> 108 #include <netinet6/mld6_var.h> 109 #include <netinet6/ip6_mroute.h> 110 #include <netinet6/in6_ifattach.h> 111 #include <netinet6/scope6_var.h> 112 #include <netinet6/in6_fib.h> 113 #include <netinet6/in6_pcb.h> 114 115 /* 116 * struct in6_ifreq and struct ifreq must be type punnable for common members 117 * of ifr_ifru to allow accessors to be shared. 118 */ 119 _Static_assert(offsetof(struct in6_ifreq, ifr_ifru) == 120 offsetof(struct ifreq, ifr_ifru), 121 "struct in6_ifreq and struct ifreq are not type punnable"); 122 123 VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix); 124 #define V_icmp6_nodeinfo_oldmcprefix VNET(icmp6_nodeinfo_oldmcprefix) 125 126 /* 127 * Definitions of some costant IP6 addresses. 128 */ 129 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 130 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 131 const struct in6_addr in6addr_nodelocal_allnodes = 132 IN6ADDR_NODELOCAL_ALLNODES_INIT; 133 const struct in6_addr in6addr_linklocal_allnodes = 134 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 135 const struct in6_addr in6addr_linklocal_allrouters = 136 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 137 const struct in6_addr in6addr_linklocal_allv2routers = 138 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT; 139 140 const struct in6_addr in6mask0 = IN6MASK0; 141 const struct in6_addr in6mask32 = IN6MASK32; 142 const struct in6_addr in6mask64 = IN6MASK64; 143 const struct in6_addr in6mask96 = IN6MASK96; 144 const struct in6_addr in6mask128 = IN6MASK128; 145 146 const struct sockaddr_in6 sa6_any = 147 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 }; 148 149 static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *, 150 struct in6_aliasreq *, int); 151 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 152 153 static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *, 154 struct in6_ifaddr *, int); 155 static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *, 156 struct in6_aliasreq *, int flags); 157 static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *, 158 struct in6_ifaddr *, int, int); 159 static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *, 160 struct in6_ifaddr *, int); 161 162 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 163 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 164 165 166 void 167 in6_newaddrmsg(struct in6_ifaddr *ia, int cmd) 168 { 169 struct sockaddr_dl gateway; 170 struct sockaddr_in6 mask, addr; 171 struct rtentry rt; 172 int fibnum; 173 174 /* 175 * initialize for rtmsg generation 176 */ 177 bzero(&gateway, sizeof(gateway)); 178 gateway.sdl_len = sizeof(gateway); 179 gateway.sdl_family = AF_LINK; 180 181 bzero(&rt, sizeof(rt)); 182 rt.rt_gateway = (struct sockaddr *)&gateway; 183 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 184 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr)); 185 rt_mask(&rt) = (struct sockaddr *)&mask; 186 rt_key(&rt) = (struct sockaddr *)&addr; 187 rt.rt_flags = RTF_HOST | RTF_STATIC; 188 if (cmd == RTM_ADD) 189 rt.rt_flags |= RTF_UP; 190 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS : ia62ifa(ia)->ifa_ifp->if_fib; 191 /* Announce arrival of local address to this FIB. */ 192 rt_newaddrmsg_fib(cmd, &ia->ia_ifa, 0, &rt, fibnum); 193 } 194 195 int 196 in6_mask2len(struct in6_addr *mask, u_char *lim0) 197 { 198 int x = 0, y; 199 u_char *lim = lim0, *p; 200 201 /* ignore the scope_id part */ 202 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 203 lim = (u_char *)mask + sizeof(*mask); 204 for (p = (u_char *)mask; p < lim; x++, p++) { 205 if (*p != 0xff) 206 break; 207 } 208 y = 0; 209 if (p < lim) { 210 for (y = 0; y < 8; y++) { 211 if ((*p & (0x80 >> y)) == 0) 212 break; 213 } 214 } 215 216 /* 217 * when the limit pointer is given, do a stricter check on the 218 * remaining bits. 219 */ 220 if (p < lim) { 221 if (y != 0 && (*p & (0x00ff >> y)) != 0) 222 return (-1); 223 for (p = p + 1; p < lim; p++) 224 if (*p != 0) 225 return (-1); 226 } 227 228 return x * 8 + y; 229 } 230 231 #ifdef COMPAT_FREEBSD32 232 struct in6_ndifreq32 { 233 char ifname[IFNAMSIZ]; 234 uint32_t ifindex; 235 }; 236 #define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32) 237 #endif 238 239 int 240 in6_control(struct socket *so, u_long cmd, caddr_t data, 241 struct ifnet *ifp, struct thread *td) 242 { 243 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 244 struct in6_ifaddr *ia = NULL; 245 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 246 struct sockaddr_in6 *sa6; 247 int carp_attached = 0; 248 int error; 249 u_long ocmd = cmd; 250 251 /* 252 * Compat to make pre-10.x ifconfig(8) operable. 253 */ 254 if (cmd == OSIOCAIFADDR_IN6) 255 cmd = SIOCAIFADDR_IN6; 256 257 switch (cmd) { 258 case SIOCGETSGCNT_IN6: 259 case SIOCGETMIFCNT_IN6: 260 /* 261 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c. 262 * We cannot see how that would be needed, so do not adjust the 263 * KPI blindly; more likely should clean up the IPv4 variant. 264 */ 265 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP); 266 } 267 268 switch (cmd) { 269 case SIOCAADDRCTL_POLICY: 270 case SIOCDADDRCTL_POLICY: 271 if (td != NULL) { 272 error = priv_check(td, PRIV_NETINET_ADDRCTRL6); 273 if (error) 274 return (error); 275 } 276 return (in6_src_ioctl(cmd, data)); 277 } 278 279 if (ifp == NULL) 280 return (EOPNOTSUPP); 281 282 switch (cmd) { 283 case SIOCSNDFLUSH_IN6: 284 case SIOCSPFXFLUSH_IN6: 285 case SIOCSRTRFLUSH_IN6: 286 case SIOCSDEFIFACE_IN6: 287 case SIOCSIFINFO_FLAGS: 288 case SIOCSIFINFO_IN6: 289 if (td != NULL) { 290 error = priv_check(td, PRIV_NETINET_ND6); 291 if (error) 292 return (error); 293 } 294 /* FALLTHROUGH */ 295 case OSIOCGIFINFO_IN6: 296 case SIOCGIFINFO_IN6: 297 case SIOCGNBRINFO_IN6: 298 case SIOCGDEFIFACE_IN6: 299 return (nd6_ioctl(cmd, data, ifp)); 300 301 #ifdef COMPAT_FREEBSD32 302 case SIOCGDEFIFACE32_IN6: 303 { 304 struct in6_ndifreq ndif; 305 struct in6_ndifreq32 *ndif32; 306 307 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif, 308 ifp); 309 if (error) 310 return (error); 311 ndif32 = (struct in6_ndifreq32 *)data; 312 ndif32->ifindex = ndif.ifindex; 313 return (0); 314 } 315 #endif 316 } 317 318 switch (cmd) { 319 case SIOCSIFPREFIX_IN6: 320 case SIOCDIFPREFIX_IN6: 321 case SIOCAIFPREFIX_IN6: 322 case SIOCCIFPREFIX_IN6: 323 case SIOCSGIFPREFIX_IN6: 324 case SIOCGIFPREFIX_IN6: 325 log(LOG_NOTICE, 326 "prefix ioctls are now invalidated. " 327 "please use ifconfig.\n"); 328 return (EOPNOTSUPP); 329 } 330 331 switch (cmd) { 332 case SIOCSSCOPE6: 333 if (td != NULL) { 334 error = priv_check(td, PRIV_NETINET_SCOPE6); 335 if (error) 336 return (error); 337 } 338 /* FALLTHROUGH */ 339 case SIOCGSCOPE6: 340 case SIOCGSCOPE6DEF: 341 return (scope6_ioctl(cmd, data, ifp)); 342 } 343 344 /* 345 * Find address for this interface, if it exists. 346 * 347 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 348 * only, and used the first interface address as the target of other 349 * operations (without checking ifra_addr). This was because netinet 350 * code/API assumed at most 1 interface address per interface. 351 * Since IPv6 allows a node to assign multiple addresses 352 * on a single interface, we almost always look and check the 353 * presence of ifra_addr, and reject invalid ones here. 354 * It also decreases duplicated code among SIOC*_IN6 operations. 355 */ 356 switch (cmd) { 357 case SIOCAIFADDR_IN6: 358 case SIOCSIFPHYADDR_IN6: 359 sa6 = &ifra->ifra_addr; 360 break; 361 case SIOCSIFADDR_IN6: 362 case SIOCGIFADDR_IN6: 363 case SIOCSIFDSTADDR_IN6: 364 case SIOCSIFNETMASK_IN6: 365 case SIOCGIFDSTADDR_IN6: 366 case SIOCGIFNETMASK_IN6: 367 case SIOCDIFADDR_IN6: 368 case SIOCGIFPSRCADDR_IN6: 369 case SIOCGIFPDSTADDR_IN6: 370 case SIOCGIFAFLAG_IN6: 371 case SIOCSNDFLUSH_IN6: 372 case SIOCSPFXFLUSH_IN6: 373 case SIOCSRTRFLUSH_IN6: 374 case SIOCGIFALIFETIME_IN6: 375 case SIOCGIFSTAT_IN6: 376 case SIOCGIFSTAT_ICMP6: 377 sa6 = &ifr->ifr_addr; 378 break; 379 case SIOCSIFADDR: 380 case SIOCSIFBRDADDR: 381 case SIOCSIFDSTADDR: 382 case SIOCSIFNETMASK: 383 /* 384 * Although we should pass any non-INET6 ioctl requests 385 * down to driver, we filter some legacy INET requests. 386 * Drivers trust SIOCSIFADDR et al to come from an already 387 * privileged layer, and do not perform any credentials 388 * checks or input validation. 389 */ 390 return (EINVAL); 391 default: 392 sa6 = NULL; 393 break; 394 } 395 if (sa6 && sa6->sin6_family == AF_INET6) { 396 if (sa6->sin6_scope_id != 0) 397 error = sa6_embedscope(sa6, 0); 398 else 399 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 400 if (error != 0) 401 return (error); 402 if (td != NULL && (error = prison_check_ip6(td->td_ucred, 403 &sa6->sin6_addr)) != 0) 404 return (error); 405 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 406 } else 407 ia = NULL; 408 409 switch (cmd) { 410 case SIOCSIFADDR_IN6: 411 case SIOCSIFDSTADDR_IN6: 412 case SIOCSIFNETMASK_IN6: 413 /* 414 * Since IPv6 allows a node to assign multiple addresses 415 * on a single interface, SIOCSIFxxx ioctls are deprecated. 416 */ 417 /* we decided to obsolete this command (20000704) */ 418 error = EINVAL; 419 goto out; 420 421 case SIOCDIFADDR_IN6: 422 /* 423 * for IPv4, we look for existing in_ifaddr here to allow 424 * "ifconfig if0 delete" to remove the first IPv4 address on 425 * the interface. For IPv6, as the spec allows multiple 426 * interface address from the day one, we consider "remove the 427 * first one" semantics to be not preferable. 428 */ 429 if (ia == NULL) { 430 error = EADDRNOTAVAIL; 431 goto out; 432 } 433 /* FALLTHROUGH */ 434 case SIOCAIFADDR_IN6: 435 /* 436 * We always require users to specify a valid IPv6 address for 437 * the corresponding operation. 438 */ 439 if (ifra->ifra_addr.sin6_family != AF_INET6 || 440 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 441 error = EAFNOSUPPORT; 442 goto out; 443 } 444 445 if (td != NULL) { 446 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 447 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR); 448 if (error) 449 goto out; 450 } 451 /* FALLTHROUGH */ 452 case SIOCGIFSTAT_IN6: 453 case SIOCGIFSTAT_ICMP6: 454 if (ifp->if_afdata[AF_INET6] == NULL) { 455 error = EPFNOSUPPORT; 456 goto out; 457 } 458 break; 459 460 case SIOCGIFADDR_IN6: 461 /* This interface is basically deprecated. use SIOCGIFCONF. */ 462 /* FALLTHROUGH */ 463 case SIOCGIFAFLAG_IN6: 464 case SIOCGIFNETMASK_IN6: 465 case SIOCGIFDSTADDR_IN6: 466 case SIOCGIFALIFETIME_IN6: 467 /* must think again about its semantics */ 468 if (ia == NULL) { 469 error = EADDRNOTAVAIL; 470 goto out; 471 } 472 break; 473 } 474 475 switch (cmd) { 476 case SIOCGIFADDR_IN6: 477 ifr->ifr_addr = ia->ia_addr; 478 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 479 goto out; 480 break; 481 482 case SIOCGIFDSTADDR_IN6: 483 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 484 error = EINVAL; 485 goto out; 486 } 487 ifr->ifr_dstaddr = ia->ia_dstaddr; 488 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 489 goto out; 490 break; 491 492 case SIOCGIFNETMASK_IN6: 493 ifr->ifr_addr = ia->ia_prefixmask; 494 break; 495 496 case SIOCGIFAFLAG_IN6: 497 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 498 break; 499 500 case SIOCGIFSTAT_IN6: 501 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 502 ifp->if_afdata[AF_INET6])->in6_ifstat, 503 &ifr->ifr_ifru.ifru_stat, 504 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 505 break; 506 507 case SIOCGIFSTAT_ICMP6: 508 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 509 ifp->if_afdata[AF_INET6])->icmp6_ifstat, 510 &ifr->ifr_ifru.ifru_icmp6stat, 511 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 512 break; 513 514 case SIOCGIFALIFETIME_IN6: 515 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 516 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 517 time_t maxexpire; 518 struct in6_addrlifetime *retlt = 519 &ifr->ifr_ifru.ifru_lifetime; 520 521 /* 522 * XXX: adjust expiration time assuming time_t is 523 * signed. 524 */ 525 maxexpire = (-1) & 526 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 527 if (ia->ia6_lifetime.ia6t_vltime < 528 maxexpire - ia->ia6_updatetime) { 529 retlt->ia6t_expire = ia->ia6_updatetime + 530 ia->ia6_lifetime.ia6t_vltime; 531 } else 532 retlt->ia6t_expire = maxexpire; 533 } 534 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 535 time_t maxexpire; 536 struct in6_addrlifetime *retlt = 537 &ifr->ifr_ifru.ifru_lifetime; 538 539 /* 540 * XXX: adjust expiration time assuming time_t is 541 * signed. 542 */ 543 maxexpire = (-1) & 544 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 545 if (ia->ia6_lifetime.ia6t_pltime < 546 maxexpire - ia->ia6_updatetime) { 547 retlt->ia6t_preferred = ia->ia6_updatetime + 548 ia->ia6_lifetime.ia6t_pltime; 549 } else 550 retlt->ia6t_preferred = maxexpire; 551 } 552 break; 553 554 case SIOCAIFADDR_IN6: 555 { 556 struct nd_prefixctl pr0; 557 struct nd_prefix *pr; 558 559 /* 560 * first, make or update the interface address structure, 561 * and link it to the list. 562 */ 563 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 564 goto out; 565 if (ia != NULL) { 566 if (ia->ia_ifa.ifa_carp) 567 (*carp_detach_p)(&ia->ia_ifa, true); 568 ifa_free(&ia->ia_ifa); 569 } 570 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 571 == NULL) { 572 /* 573 * this can happen when the user specify the 0 valid 574 * lifetime. 575 */ 576 break; 577 } 578 579 if (cmd == ocmd && ifra->ifra_vhid > 0) { 580 if (carp_attach_p != NULL) 581 error = (*carp_attach_p)(&ia->ia_ifa, 582 ifra->ifra_vhid); 583 else 584 error = EPROTONOSUPPORT; 585 if (error) 586 goto out; 587 else 588 carp_attached = 1; 589 } 590 591 /* 592 * then, make the prefix on-link on the interface. 593 * XXX: we'd rather create the prefix before the address, but 594 * we need at least one address to install the corresponding 595 * interface route, so we configure the address first. 596 */ 597 598 /* 599 * convert mask to prefix length (prefixmask has already 600 * been validated in in6_update_ifa(). 601 */ 602 bzero(&pr0, sizeof(pr0)); 603 pr0.ndpr_ifp = ifp; 604 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 605 NULL); 606 if (pr0.ndpr_plen == 128) { 607 /* we don't need to install a host route. */ 608 goto aifaddr_out; 609 } 610 pr0.ndpr_prefix = ifra->ifra_addr; 611 /* apply the mask for safety. */ 612 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, 613 &ifra->ifra_prefixmask.sin6_addr); 614 615 /* 616 * XXX: since we don't have an API to set prefix (not address) 617 * lifetimes, we just use the same lifetimes as addresses. 618 * The (temporarily) installed lifetimes can be overridden by 619 * later advertised RAs (when accept_rtadv is non 0), which is 620 * an intended behavior. 621 */ 622 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 623 pr0.ndpr_raf_auto = 624 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 625 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 626 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 627 628 /* add the prefix if not yet. */ 629 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 630 /* 631 * nd6_prelist_add will install the corresponding 632 * interface route. 633 */ 634 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) { 635 if (carp_attached) 636 (*carp_detach_p)(&ia->ia_ifa, false); 637 goto out; 638 } 639 } 640 641 /* relate the address to the prefix */ 642 if (ia->ia6_ndpr == NULL) { 643 ia->ia6_ndpr = pr; 644 pr->ndpr_addrcnt++; 645 646 /* 647 * If this is the first autoconf address from the 648 * prefix, create a temporary address as well 649 * (when required). 650 */ 651 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 652 V_ip6_use_tempaddr && pr->ndpr_addrcnt == 1) { 653 int e; 654 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 655 log(LOG_NOTICE, "in6_control: failed " 656 "to create a temporary address, " 657 "errno=%d\n", e); 658 } 659 } 660 } 661 nd6_prefix_rele(pr); 662 663 /* 664 * this might affect the status of autoconfigured addresses, 665 * that is, this address might make other addresses detached. 666 */ 667 pfxlist_onlink_check(); 668 669 aifaddr_out: 670 /* 671 * Try to clear the flag when a new IPv6 address is added 672 * onto an IFDISABLED interface and it succeeds. 673 */ 674 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) { 675 struct in6_ndireq nd; 676 677 memset(&nd, 0, sizeof(nd)); 678 nd.ndi.flags = ND_IFINFO(ifp)->flags; 679 nd.ndi.flags &= ~ND6_IFF_IFDISABLED; 680 if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0) 681 log(LOG_NOTICE, "SIOCAIFADDR_IN6: " 682 "SIOCSIFINFO_FLAGS for -ifdisabled " 683 "failed."); 684 /* 685 * Ignore failure of clearing the flag intentionally. 686 * The failure means address duplication was detected. 687 */ 688 } 689 break; 690 } 691 692 case SIOCDIFADDR_IN6: 693 { 694 struct nd_prefix *pr; 695 696 /* 697 * If the address being deleted is the only one that owns 698 * the corresponding prefix, expire the prefix as well. 699 * XXX: theoretically, we don't have to worry about such 700 * relationship, since we separate the address management 701 * and the prefix management. We do this, however, to provide 702 * as much backward compatibility as possible in terms of 703 * the ioctl operation. 704 * Note that in6_purgeaddr() will decrement ndpr_addrcnt. 705 */ 706 pr = ia->ia6_ndpr; 707 in6_purgeaddr(&ia->ia_ifa); 708 if (pr != NULL && pr->ndpr_addrcnt == 0) { 709 ND6_WLOCK(); 710 nd6_prefix_unlink(pr, NULL); 711 ND6_WUNLOCK(); 712 nd6_prefix_del(pr); 713 } 714 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 715 break; 716 } 717 718 default: 719 if (ifp->if_ioctl == NULL) { 720 error = EOPNOTSUPP; 721 goto out; 722 } 723 error = (*ifp->if_ioctl)(ifp, cmd, data); 724 goto out; 725 } 726 727 error = 0; 728 out: 729 if (ia != NULL) 730 ifa_free(&ia->ia_ifa); 731 return (error); 732 } 733 734 735 static struct in6_multi_mship * 736 in6_joingroup_legacy(struct ifnet *ifp, const struct in6_addr *mcaddr, 737 int *errorp, int delay) 738 { 739 struct in6_multi_mship *imm; 740 int error; 741 742 imm = malloc(sizeof(*imm), M_IP6MADDR, M_NOWAIT); 743 if (imm == NULL) { 744 *errorp = ENOBUFS; 745 return (NULL); 746 } 747 748 delay = (delay * PR_FASTHZ) / hz; 749 750 error = in6_joingroup(ifp, mcaddr, NULL, &imm->i6mm_maddr, delay); 751 if (error) { 752 *errorp = error; 753 free(imm, M_IP6MADDR); 754 return (NULL); 755 } 756 757 return (imm); 758 } 759 /* 760 * Join necessary multicast groups. Factored out from in6_update_ifa(). 761 * This entire work should only be done once, for the default FIB. 762 */ 763 static int 764 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra, 765 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol) 766 { 767 char ip6buf[INET6_ADDRSTRLEN]; 768 struct in6_addr mltaddr; 769 struct in6_multi_mship *imm; 770 int delay, error; 771 772 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__)); 773 774 /* Join solicited multicast addr for new host id. */ 775 bzero(&mltaddr, sizeof(struct in6_addr)); 776 mltaddr.s6_addr32[0] = IPV6_ADDR_INT32_MLL; 777 mltaddr.s6_addr32[2] = htonl(1); 778 mltaddr.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 779 mltaddr.s6_addr8[12] = 0xff; 780 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) { 781 /* XXX: should not happen */ 782 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 783 goto cleanup; 784 } 785 delay = error = 0; 786 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 787 /* 788 * We need a random delay for DAD on the address being 789 * configured. It also means delaying transmission of the 790 * corresponding MLD report to avoid report collision. 791 * [RFC 4861, Section 6.3.7] 792 */ 793 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 794 } 795 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay); 796 if (imm == NULL) { 797 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 798 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 799 if_name(ifp), error)); 800 goto cleanup; 801 } 802 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 803 *in6m_sol = imm->i6mm_maddr; 804 805 /* 806 * Join link-local all-nodes address. 807 */ 808 mltaddr = in6addr_linklocal_allnodes; 809 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 810 goto cleanup; /* XXX: should not fail */ 811 812 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, 0); 813 if (imm == NULL) { 814 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 815 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 816 if_name(ifp), error)); 817 goto cleanup; 818 } 819 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 820 821 /* 822 * Join node information group address. 823 */ 824 delay = 0; 825 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 826 /* 827 * The spec does not say anything about delay for this group, 828 * but the same logic should apply. 829 */ 830 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 831 } 832 if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) { 833 /* XXX jinmei */ 834 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay); 835 if (imm == NULL) 836 nd6log((LOG_WARNING, 837 "%s: in6_joingroup failed for %s on %s " 838 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 839 &mltaddr), if_name(ifp), error)); 840 /* XXX not very fatal, go on... */ 841 else 842 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 843 } 844 if (V_icmp6_nodeinfo_oldmcprefix && 845 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) { 846 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay); 847 if (imm == NULL) 848 nd6log((LOG_WARNING, 849 "%s: in6_joingroup failed for %s on %s " 850 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 851 &mltaddr), if_name(ifp), error)); 852 /* XXX not very fatal, go on... */ 853 else 854 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 855 } 856 857 /* 858 * Join interface-local all-nodes address. 859 * (ff01::1%ifN, and ff01::%ifN/32) 860 */ 861 mltaddr = in6addr_nodelocal_allnodes; 862 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 863 goto cleanup; /* XXX: should not fail */ 864 865 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, 0); 866 if (imm == NULL) { 867 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 868 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 869 &mltaddr), if_name(ifp), error)); 870 goto cleanup; 871 } 872 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 873 874 cleanup: 875 return (error); 876 } 877 878 /* 879 * Update parameters of an IPv6 interface address. 880 * If necessary, a new entry is created and linked into address chains. 881 * This function is separated from in6_control(). 882 */ 883 int 884 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 885 struct in6_ifaddr *ia, int flags) 886 { 887 int error, hostIsNew = 0; 888 889 if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0) 890 return (error); 891 892 if (ia == NULL) { 893 hostIsNew = 1; 894 if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL) 895 return (ENOBUFS); 896 } 897 898 error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags); 899 if (error != 0) { 900 if (hostIsNew != 0) { 901 in6_unlink_ifa(ia, ifp); 902 ifa_free(&ia->ia_ifa); 903 } 904 return (error); 905 } 906 907 if (hostIsNew) 908 error = in6_broadcast_ifa(ifp, ifra, ia, flags); 909 910 return (error); 911 } 912 913 /* 914 * Fill in basic IPv6 address request info. 915 */ 916 void 917 in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr, 918 const struct in6_addr *mask) 919 { 920 921 memset(ifra, 0, sizeof(struct in6_aliasreq)); 922 923 ifra->ifra_addr.sin6_family = AF_INET6; 924 ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 925 if (addr != NULL) 926 ifra->ifra_addr.sin6_addr = *addr; 927 928 ifra->ifra_prefixmask.sin6_family = AF_INET6; 929 ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 930 if (mask != NULL) 931 ifra->ifra_prefixmask.sin6_addr = *mask; 932 } 933 934 static int 935 in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra, 936 struct in6_ifaddr *ia, int flags) 937 { 938 int plen = -1; 939 struct sockaddr_in6 dst6; 940 struct in6_addrlifetime *lt; 941 char ip6buf[INET6_ADDRSTRLEN]; 942 943 /* Validate parameters */ 944 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 945 return (EINVAL); 946 947 /* 948 * The destination address for a p2p link must have a family 949 * of AF_UNSPEC or AF_INET6. 950 */ 951 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 952 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 953 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 954 return (EAFNOSUPPORT); 955 956 /* 957 * Validate address 958 */ 959 if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) || 960 ifra->ifra_addr.sin6_family != AF_INET6) 961 return (EINVAL); 962 963 /* 964 * validate ifra_prefixmask. don't check sin6_family, netmask 965 * does not carry fields other than sin6_len. 966 */ 967 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 968 return (EINVAL); 969 /* 970 * Because the IPv6 address architecture is classless, we require 971 * users to specify a (non 0) prefix length (mask) for a new address. 972 * We also require the prefix (when specified) mask is valid, and thus 973 * reject a non-consecutive mask. 974 */ 975 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 976 return (EINVAL); 977 if (ifra->ifra_prefixmask.sin6_len != 0) { 978 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 979 (u_char *)&ifra->ifra_prefixmask + 980 ifra->ifra_prefixmask.sin6_len); 981 if (plen <= 0) 982 return (EINVAL); 983 } else { 984 /* 985 * In this case, ia must not be NULL. We just use its prefix 986 * length. 987 */ 988 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 989 } 990 /* 991 * If the destination address on a p2p interface is specified, 992 * and the address is a scoped one, validate/set the scope 993 * zone identifier. 994 */ 995 dst6 = ifra->ifra_dstaddr; 996 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 997 (dst6.sin6_family == AF_INET6)) { 998 struct in6_addr in6_tmp; 999 u_int32_t zoneid; 1000 1001 in6_tmp = dst6.sin6_addr; 1002 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 1003 return (EINVAL); /* XXX: should be impossible */ 1004 1005 if (dst6.sin6_scope_id != 0) { 1006 if (dst6.sin6_scope_id != zoneid) 1007 return (EINVAL); 1008 } else /* user omit to specify the ID. */ 1009 dst6.sin6_scope_id = zoneid; 1010 1011 /* convert into the internal form */ 1012 if (sa6_embedscope(&dst6, 0)) 1013 return (EINVAL); /* XXX: should be impossible */ 1014 } 1015 /* Modify original ifra_dstaddr to reflect changes */ 1016 ifra->ifra_dstaddr = dst6; 1017 1018 /* 1019 * The destination address can be specified only for a p2p or a 1020 * loopback interface. If specified, the corresponding prefix length 1021 * must be 128. 1022 */ 1023 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 1024 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 1025 /* XXX: noisy message */ 1026 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 1027 "be specified for a p2p or a loopback IF only\n")); 1028 return (EINVAL); 1029 } 1030 if (plen != 128) { 1031 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 1032 "be 128 when dstaddr is specified\n")); 1033 return (EINVAL); 1034 } 1035 } 1036 /* lifetime consistency check */ 1037 lt = &ifra->ifra_lifetime; 1038 if (lt->ia6t_pltime > lt->ia6t_vltime) 1039 return (EINVAL); 1040 if (lt->ia6t_vltime == 0) { 1041 /* 1042 * the following log might be noisy, but this is a typical 1043 * configuration mistake or a tool's bug. 1044 */ 1045 nd6log((LOG_INFO, 1046 "in6_update_ifa: valid lifetime is 0 for %s\n", 1047 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr))); 1048 1049 if (ia == NULL) 1050 return (0); /* there's nothing to do */ 1051 } 1052 1053 /* Check prefix mask */ 1054 if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) { 1055 /* 1056 * We prohibit changing the prefix length of an existing 1057 * address, because 1058 * + such an operation should be rare in IPv6, and 1059 * + the operation would confuse prefix management. 1060 */ 1061 if (ia->ia_prefixmask.sin6_len != 0 && 1062 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 1063 nd6log((LOG_INFO, "in6_validate_ifa: the prefix length " 1064 "of an existing %s address should not be changed\n", 1065 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1066 1067 return (EINVAL); 1068 } 1069 } 1070 1071 return (0); 1072 } 1073 1074 1075 /* 1076 * Allocate a new ifaddr and link it into chains. 1077 */ 1078 static struct in6_ifaddr * 1079 in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags) 1080 { 1081 struct in6_ifaddr *ia; 1082 1083 /* 1084 * When in6_alloc_ifa() is called in a process of a received 1085 * RA, it is called under an interrupt context. So, we should 1086 * call malloc with M_NOWAIT. 1087 */ 1088 ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT); 1089 if (ia == NULL) 1090 return (NULL); 1091 LIST_INIT(&ia->ia6_memberships); 1092 /* Initialize the address and masks, and put time stamp */ 1093 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1094 ia->ia_addr.sin6_family = AF_INET6; 1095 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 1096 /* XXX: Can we assign ,sin6_addr and skip the rest? */ 1097 ia->ia_addr = ifra->ifra_addr; 1098 ia->ia6_createtime = time_uptime; 1099 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1100 /* 1101 * Some functions expect that ifa_dstaddr is not 1102 * NULL for p2p interfaces. 1103 */ 1104 ia->ia_ifa.ifa_dstaddr = 1105 (struct sockaddr *)&ia->ia_dstaddr; 1106 } else { 1107 ia->ia_ifa.ifa_dstaddr = NULL; 1108 } 1109 1110 /* set prefix mask if any */ 1111 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 1112 if (ifra->ifra_prefixmask.sin6_len != 0) { 1113 ia->ia_prefixmask.sin6_family = AF_INET6; 1114 ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len; 1115 ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr; 1116 } 1117 1118 ia->ia_ifp = ifp; 1119 ifa_ref(&ia->ia_ifa); /* if_addrhead */ 1120 IF_ADDR_WLOCK(ifp); 1121 TAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1122 IF_ADDR_WUNLOCK(ifp); 1123 1124 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */ 1125 IN6_IFADDR_WLOCK(); 1126 TAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link); 1127 LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash); 1128 IN6_IFADDR_WUNLOCK(); 1129 1130 return (ia); 1131 } 1132 1133 /* 1134 * Update/configure interface address parameters: 1135 * 1136 * 1) Update lifetime 1137 * 2) Update interface metric ad flags 1138 * 3) Notify other subsystems 1139 */ 1140 static int 1141 in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra, 1142 struct in6_ifaddr *ia, int hostIsNew, int flags) 1143 { 1144 int error; 1145 1146 /* update timestamp */ 1147 ia->ia6_updatetime = time_uptime; 1148 1149 /* 1150 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1151 * to see if the address is deprecated or invalidated, but initialize 1152 * these members for applications. 1153 */ 1154 ia->ia6_lifetime = ifra->ifra_lifetime; 1155 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1156 ia->ia6_lifetime.ia6t_expire = 1157 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1158 } else 1159 ia->ia6_lifetime.ia6t_expire = 0; 1160 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1161 ia->ia6_lifetime.ia6t_preferred = 1162 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1163 } else 1164 ia->ia6_lifetime.ia6t_preferred = 0; 1165 1166 /* 1167 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1168 * userland, make it deprecated. 1169 */ 1170 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1171 ia->ia6_lifetime.ia6t_pltime = 0; 1172 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1173 } 1174 1175 /* 1176 * configure address flags. 1177 */ 1178 ia->ia6_flags = ifra->ifra_flags; 1179 1180 /* 1181 * Make the address tentative before joining multicast addresses, 1182 * so that corresponding MLD responses would not have a tentative 1183 * source address. 1184 */ 1185 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1186 1187 /* 1188 * DAD should be performed for an new address or addresses on 1189 * an interface with ND6_IFF_IFDISABLED. 1190 */ 1191 if (in6if_do_dad(ifp) && 1192 (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED))) 1193 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1194 1195 /* notify other subsystems */ 1196 error = in6_notify_ifa(ifp, ia, ifra, hostIsNew); 1197 1198 return (error); 1199 } 1200 1201 /* 1202 * Do link-level ifa job: 1203 * 1) Add lle entry for added address 1204 * 2) Notifies routing socket users about new address 1205 * 3) join appropriate multicast group 1206 * 4) start DAD if enabled 1207 */ 1208 static int 1209 in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1210 struct in6_ifaddr *ia, int flags) 1211 { 1212 struct in6_multi *in6m_sol; 1213 int error = 0; 1214 1215 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1216 if ((error = nd6_add_ifa_lle(ia)) != 0) { 1217 in6_purgeaddr(&ia->ia_ifa); 1218 ifa_free(&ia->ia_ifa); 1219 return (error); 1220 } 1221 1222 /* Join necessary multicast groups. */ 1223 in6m_sol = NULL; 1224 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1225 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol); 1226 if (error != 0) { 1227 in6_purgeaddr(&ia->ia_ifa); 1228 ifa_free(&ia->ia_ifa); 1229 return (error); 1230 } 1231 } 1232 1233 /* Perform DAD, if the address is TENTATIVE. */ 1234 if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) { 1235 int delay, mindelay, maxdelay; 1236 1237 delay = 0; 1238 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1239 /* 1240 * We need to impose a delay before sending an NS 1241 * for DAD. Check if we also needed a delay for the 1242 * corresponding MLD message. If we did, the delay 1243 * should be larger than the MLD delay (this could be 1244 * relaxed a bit, but this simple logic is at least 1245 * safe). 1246 * XXX: Break data hiding guidelines and look at 1247 * state for the solicited multicast group. 1248 */ 1249 mindelay = 0; 1250 if (in6m_sol != NULL && 1251 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) { 1252 mindelay = in6m_sol->in6m_timer; 1253 } 1254 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1255 if (maxdelay - mindelay == 0) 1256 delay = 0; 1257 else { 1258 delay = 1259 (arc4random() % (maxdelay - mindelay)) + 1260 mindelay; 1261 } 1262 } 1263 nd6_dad_start((struct ifaddr *)ia, delay); 1264 } 1265 1266 in6_newaddrmsg(ia, RTM_ADD); 1267 ifa_free(&ia->ia_ifa); 1268 return (error); 1269 } 1270 1271 void 1272 in6_purgeaddr(struct ifaddr *ifa) 1273 { 1274 struct ifnet *ifp = ifa->ifa_ifp; 1275 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1276 struct in6_multi_mship *imm; 1277 int plen, error; 1278 1279 if (ifa->ifa_carp) 1280 (*carp_detach_p)(ifa, false); 1281 1282 /* 1283 * Remove the loopback route to the interface address. 1284 * The check for the current setting of "nd6_useloopback" 1285 * is not needed. 1286 */ 1287 if (ia->ia_flags & IFA_RTSELF) { 1288 error = ifa_del_loopback_route((struct ifaddr *)ia, 1289 (struct sockaddr *)&ia->ia_addr); 1290 if (error == 0) 1291 ia->ia_flags &= ~IFA_RTSELF; 1292 } 1293 1294 /* stop DAD processing */ 1295 nd6_dad_stop(ifa); 1296 1297 /* Leave multicast groups. */ 1298 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1299 LIST_REMOVE(imm, i6mm_chain); 1300 if (imm->i6mm_maddr != NULL) 1301 in6_leavegroup(imm->i6mm_maddr, NULL); 1302 free(imm, M_IP6MADDR); 1303 } 1304 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1305 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) { 1306 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags | 1307 (ia->ia_dstaddr.sin6_family == AF_INET6 ? RTF_HOST : 0)); 1308 if (error != 0) 1309 log(LOG_INFO, "%s: err=%d, destination address delete " 1310 "failed\n", __func__, error); 1311 ia->ia_flags &= ~IFA_ROUTE; 1312 } 1313 1314 in6_newaddrmsg(ia, RTM_DELETE); 1315 in6_unlink_ifa(ia, ifp); 1316 } 1317 1318 static void 1319 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1320 { 1321 char ip6buf[INET6_ADDRSTRLEN]; 1322 int remove_lle; 1323 1324 IF_ADDR_WLOCK(ifp); 1325 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1326 IF_ADDR_WUNLOCK(ifp); 1327 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1328 1329 /* 1330 * Defer the release of what might be the last reference to the 1331 * in6_ifaddr so that it can't be freed before the remainder of the 1332 * cleanup. 1333 */ 1334 IN6_IFADDR_WLOCK(); 1335 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 1336 LIST_REMOVE(ia, ia6_hash); 1337 IN6_IFADDR_WUNLOCK(); 1338 1339 /* 1340 * Release the reference to the base prefix. There should be a 1341 * positive reference. 1342 */ 1343 remove_lle = 0; 1344 if (ia->ia6_ndpr == NULL) { 1345 nd6log((LOG_NOTICE, 1346 "in6_unlink_ifa: autoconf'ed address " 1347 "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia)))); 1348 } else { 1349 ia->ia6_ndpr->ndpr_addrcnt--; 1350 /* Do not delete lles within prefix if refcont != 0 */ 1351 if (ia->ia6_ndpr->ndpr_addrcnt == 0) 1352 remove_lle = 1; 1353 ia->ia6_ndpr = NULL; 1354 } 1355 1356 nd6_rem_ifa_lle(ia, remove_lle); 1357 1358 /* 1359 * Also, if the address being removed is autoconf'ed, call 1360 * pfxlist_onlink_check() since the release might affect the status of 1361 * other (detached) addresses. 1362 */ 1363 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1364 pfxlist_onlink_check(); 1365 } 1366 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1367 } 1368 1369 /* 1370 * Notifies other subsystems about address change/arrival: 1371 * 1) Notifies device handler on the first IPv6 address assignment 1372 * 2) Handle routing table changes for P2P links and route 1373 * 3) Handle routing table changes for address host route 1374 */ 1375 static int 1376 in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia, 1377 struct in6_aliasreq *ifra, int hostIsNew) 1378 { 1379 int error = 0, plen, ifacount = 0; 1380 struct ifaddr *ifa; 1381 struct sockaddr_in6 *pdst; 1382 char ip6buf[INET6_ADDRSTRLEN]; 1383 1384 /* 1385 * Give the interface a chance to initialize 1386 * if this is its first address, 1387 */ 1388 if (hostIsNew != 0) { 1389 IF_ADDR_RLOCK(ifp); 1390 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1391 if (ifa->ifa_addr->sa_family != AF_INET6) 1392 continue; 1393 ifacount++; 1394 } 1395 IF_ADDR_RUNLOCK(ifp); 1396 } 1397 1398 if (ifacount <= 1 && ifp->if_ioctl) { 1399 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1400 if (error) 1401 goto done; 1402 } 1403 1404 /* 1405 * If a new destination address is specified, scrub the old one and 1406 * install the new destination. Note that the interface must be 1407 * p2p or loopback. 1408 */ 1409 pdst = &ifra->ifra_dstaddr; 1410 if (pdst->sin6_family == AF_INET6 && 1411 !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1412 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1413 (rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0)) { 1414 nd6log((LOG_ERR, "in6_update_ifa_internal: failed to " 1415 "remove a route to the old destination: %s\n", 1416 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1417 /* proceed anyway... */ 1418 } else 1419 ia->ia_flags &= ~IFA_ROUTE; 1420 ia->ia_dstaddr = *pdst; 1421 } 1422 1423 /* 1424 * If a new destination address is specified for a point-to-point 1425 * interface, install a route to the destination as an interface 1426 * direct route. 1427 * XXX: the logic below rejects assigning multiple addresses on a p2p 1428 * interface that share the same destination. 1429 */ 1430 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1431 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 && 1432 ia->ia_dstaddr.sin6_family == AF_INET6) { 1433 int rtflags = RTF_UP | RTF_HOST; 1434 /* 1435 * Handle the case for ::1 . 1436 */ 1437 if (ifp->if_flags & IFF_LOOPBACK) 1438 ia->ia_flags |= IFA_RTSELF; 1439 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags); 1440 if (error) 1441 goto done; 1442 ia->ia_flags |= IFA_ROUTE; 1443 } 1444 1445 /* 1446 * add a loopback route to self if not exists 1447 */ 1448 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) { 1449 error = ifa_add_loopback_route((struct ifaddr *)ia, 1450 (struct sockaddr *)&ia->ia_addr); 1451 if (error == 0) 1452 ia->ia_flags |= IFA_RTSELF; 1453 } 1454 done: 1455 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 1456 "Invoking IPv6 network device address event may sleep"); 1457 1458 EVENTHANDLER_INVOKE(ifaddr_event, ifp); 1459 1460 return (error); 1461 } 1462 1463 /* 1464 * Find an IPv6 interface link-local address specific to an interface. 1465 * ifaddr is returned referenced. 1466 */ 1467 struct in6_ifaddr * 1468 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1469 { 1470 struct ifaddr *ifa; 1471 1472 IF_ADDR_RLOCK(ifp); 1473 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1474 if (ifa->ifa_addr->sa_family != AF_INET6) 1475 continue; 1476 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1477 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1478 ignoreflags) != 0) 1479 continue; 1480 ifa_ref(ifa); 1481 break; 1482 } 1483 } 1484 IF_ADDR_RUNLOCK(ifp); 1485 1486 return ((struct in6_ifaddr *)ifa); 1487 } 1488 1489 1490 /* 1491 * find the interface address corresponding to a given IPv6 address. 1492 * ifaddr is returned referenced. 1493 */ 1494 struct in6_ifaddr * 1495 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid) 1496 { 1497 struct rm_priotracker in6_ifa_tracker; 1498 struct in6_ifaddr *ia; 1499 1500 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1501 LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) { 1502 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1503 if (zoneid != 0 && 1504 zoneid != ia->ia_addr.sin6_scope_id) 1505 continue; 1506 ifa_ref(&ia->ia_ifa); 1507 break; 1508 } 1509 } 1510 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1511 return (ia); 1512 } 1513 1514 /* 1515 * find the internet address corresponding to a given interface and address. 1516 * ifaddr is returned referenced. 1517 */ 1518 struct in6_ifaddr * 1519 in6ifa_ifpwithaddr(struct ifnet *ifp, const struct in6_addr *addr) 1520 { 1521 struct ifaddr *ifa; 1522 1523 IF_ADDR_RLOCK(ifp); 1524 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1525 if (ifa->ifa_addr->sa_family != AF_INET6) 1526 continue; 1527 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1528 ifa_ref(ifa); 1529 break; 1530 } 1531 } 1532 IF_ADDR_RUNLOCK(ifp); 1533 1534 return ((struct in6_ifaddr *)ifa); 1535 } 1536 1537 /* 1538 * Find a link-local scoped address on ifp and return it if any. 1539 */ 1540 struct in6_ifaddr * 1541 in6ifa_llaonifp(struct ifnet *ifp) 1542 { 1543 struct sockaddr_in6 *sin6; 1544 struct ifaddr *ifa; 1545 1546 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1547 return (NULL); 1548 IF_ADDR_RLOCK(ifp); 1549 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1550 if (ifa->ifa_addr->sa_family != AF_INET6) 1551 continue; 1552 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 1553 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 1554 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) || 1555 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr)) 1556 break; 1557 } 1558 IF_ADDR_RUNLOCK(ifp); 1559 1560 return ((struct in6_ifaddr *)ifa); 1561 } 1562 1563 /* 1564 * Convert IP6 address to printable (loggable) representation. Caller 1565 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 1566 */ 1567 static char digits[] = "0123456789abcdef"; 1568 char * 1569 ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 1570 { 1571 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0; 1572 char *cp; 1573 const u_int16_t *a = (const u_int16_t *)addr; 1574 const u_int8_t *d; 1575 int dcolon = 0, zero = 0; 1576 1577 cp = ip6buf; 1578 1579 for (i = 0; i < 8; i++) { 1580 if (*(a + i) == 0) { 1581 cnt++; 1582 if (cnt == 1) 1583 idx = i; 1584 } 1585 else if (maxcnt < cnt) { 1586 maxcnt = cnt; 1587 index = idx; 1588 cnt = 0; 1589 } 1590 } 1591 if (maxcnt < cnt) { 1592 maxcnt = cnt; 1593 index = idx; 1594 } 1595 1596 for (i = 0; i < 8; i++) { 1597 if (dcolon == 1) { 1598 if (*a == 0) { 1599 if (i == 7) 1600 *cp++ = ':'; 1601 a++; 1602 continue; 1603 } else 1604 dcolon = 2; 1605 } 1606 if (*a == 0) { 1607 if (dcolon == 0 && *(a + 1) == 0 && i == index) { 1608 if (i == 0) 1609 *cp++ = ':'; 1610 *cp++ = ':'; 1611 dcolon = 1; 1612 } else { 1613 *cp++ = '0'; 1614 *cp++ = ':'; 1615 } 1616 a++; 1617 continue; 1618 } 1619 d = (const u_char *)a; 1620 /* Try to eliminate leading zeros in printout like in :0001. */ 1621 zero = 1; 1622 *cp = digits[*d >> 4]; 1623 if (*cp != '0') { 1624 zero = 0; 1625 cp++; 1626 } 1627 *cp = digits[*d++ & 0xf]; 1628 if (zero == 0 || (*cp != '0')) { 1629 zero = 0; 1630 cp++; 1631 } 1632 *cp = digits[*d >> 4]; 1633 if (zero == 0 || (*cp != '0')) { 1634 zero = 0; 1635 cp++; 1636 } 1637 *cp++ = digits[*d & 0xf]; 1638 *cp++ = ':'; 1639 a++; 1640 } 1641 *--cp = '\0'; 1642 return (ip6buf); 1643 } 1644 1645 int 1646 in6_localaddr(struct in6_addr *in6) 1647 { 1648 struct rm_priotracker in6_ifa_tracker; 1649 struct in6_ifaddr *ia; 1650 1651 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1652 return 1; 1653 1654 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1655 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 1656 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1657 &ia->ia_prefixmask.sin6_addr)) { 1658 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1659 return 1; 1660 } 1661 } 1662 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1663 1664 return (0); 1665 } 1666 1667 /* 1668 * Return 1 if an internet address is for the local host and configured 1669 * on one of its interfaces. 1670 */ 1671 int 1672 in6_localip(struct in6_addr *in6) 1673 { 1674 struct rm_priotracker in6_ifa_tracker; 1675 struct in6_ifaddr *ia; 1676 1677 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1678 LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 1679 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) { 1680 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1681 return (1); 1682 } 1683 } 1684 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1685 return (0); 1686 } 1687 1688 /* 1689 * Return 1 if an internet address is configured on an interface. 1690 */ 1691 int 1692 in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr) 1693 { 1694 struct in6_addr in6; 1695 struct ifaddr *ifa; 1696 struct in6_ifaddr *ia6; 1697 1698 in6 = *addr; 1699 if (in6_clearscope(&in6)) 1700 return (0); 1701 in6_setscope(&in6, ifp, NULL); 1702 1703 IF_ADDR_RLOCK(ifp); 1704 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1705 if (ifa->ifa_addr->sa_family != AF_INET6) 1706 continue; 1707 ia6 = (struct in6_ifaddr *)ifa; 1708 if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) { 1709 IF_ADDR_RUNLOCK(ifp); 1710 return (1); 1711 } 1712 } 1713 IF_ADDR_RUNLOCK(ifp); 1714 1715 return (0); 1716 } 1717 1718 int 1719 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1720 { 1721 struct rm_priotracker in6_ifa_tracker; 1722 struct in6_ifaddr *ia; 1723 1724 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1725 LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) { 1726 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) { 1727 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 1728 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1729 return (1); /* true */ 1730 } 1731 break; 1732 } 1733 } 1734 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1735 1736 return (0); /* false */ 1737 } 1738 1739 /* 1740 * return length of part which dst and src are equal 1741 * hard coding... 1742 */ 1743 int 1744 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1745 { 1746 int match = 0; 1747 u_char *s = (u_char *)src, *d = (u_char *)dst; 1748 u_char *lim = s + 16, r; 1749 1750 while (s < lim) 1751 if ((r = (*d++ ^ *s++)) != 0) { 1752 while (r < 128) { 1753 match++; 1754 r <<= 1; 1755 } 1756 break; 1757 } else 1758 match += 8; 1759 return match; 1760 } 1761 1762 /* XXX: to be scope conscious */ 1763 int 1764 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1765 { 1766 int bytelen, bitlen; 1767 1768 /* sanity check */ 1769 if (0 > len || len > 128) { 1770 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1771 len); 1772 return (0); 1773 } 1774 1775 bytelen = len / 8; 1776 bitlen = len % 8; 1777 1778 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1779 return (0); 1780 if (bitlen != 0 && 1781 p1->s6_addr[bytelen] >> (8 - bitlen) != 1782 p2->s6_addr[bytelen] >> (8 - bitlen)) 1783 return (0); 1784 1785 return (1); 1786 } 1787 1788 void 1789 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1790 { 1791 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1792 int bytelen, bitlen, i; 1793 1794 /* sanity check */ 1795 if (0 > len || len > 128) { 1796 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1797 len); 1798 return; 1799 } 1800 1801 bzero(maskp, sizeof(*maskp)); 1802 bytelen = len / 8; 1803 bitlen = len % 8; 1804 for (i = 0; i < bytelen; i++) 1805 maskp->s6_addr[i] = 0xff; 1806 if (bitlen) 1807 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1808 } 1809 1810 /* 1811 * return the best address out of the same scope. if no address was 1812 * found, return the first valid address from designated IF. 1813 */ 1814 struct in6_ifaddr * 1815 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 1816 { 1817 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 1818 struct ifaddr *ifa; 1819 struct in6_ifaddr *besta = NULL; 1820 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 1821 1822 dep[0] = dep[1] = NULL; 1823 1824 /* 1825 * We first look for addresses in the same scope. 1826 * If there is one, return it. 1827 * If two or more, return one which matches the dst longest. 1828 * If none, return one of global addresses assigned other ifs. 1829 */ 1830 IF_ADDR_RLOCK(ifp); 1831 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1832 if (ifa->ifa_addr->sa_family != AF_INET6) 1833 continue; 1834 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1835 continue; /* XXX: is there any case to allow anycast? */ 1836 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1837 continue; /* don't use this interface */ 1838 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1839 continue; 1840 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1841 if (V_ip6_use_deprecated) 1842 dep[0] = (struct in6_ifaddr *)ifa; 1843 continue; 1844 } 1845 1846 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 1847 /* 1848 * call in6_matchlen() as few as possible 1849 */ 1850 if (besta) { 1851 if (blen == -1) 1852 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 1853 tlen = in6_matchlen(IFA_IN6(ifa), dst); 1854 if (tlen > blen) { 1855 blen = tlen; 1856 besta = (struct in6_ifaddr *)ifa; 1857 } 1858 } else 1859 besta = (struct in6_ifaddr *)ifa; 1860 } 1861 } 1862 if (besta) { 1863 ifa_ref(&besta->ia_ifa); 1864 IF_ADDR_RUNLOCK(ifp); 1865 return (besta); 1866 } 1867 1868 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1869 if (ifa->ifa_addr->sa_family != AF_INET6) 1870 continue; 1871 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1872 continue; /* XXX: is there any case to allow anycast? */ 1873 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1874 continue; /* don't use this interface */ 1875 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1876 continue; 1877 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1878 if (V_ip6_use_deprecated) 1879 dep[1] = (struct in6_ifaddr *)ifa; 1880 continue; 1881 } 1882 1883 if (ifa != NULL) 1884 ifa_ref(ifa); 1885 IF_ADDR_RUNLOCK(ifp); 1886 return (struct in6_ifaddr *)ifa; 1887 } 1888 1889 /* use the last-resort values, that are, deprecated addresses */ 1890 if (dep[0]) { 1891 ifa_ref((struct ifaddr *)dep[0]); 1892 IF_ADDR_RUNLOCK(ifp); 1893 return dep[0]; 1894 } 1895 if (dep[1]) { 1896 ifa_ref((struct ifaddr *)dep[1]); 1897 IF_ADDR_RUNLOCK(ifp); 1898 return dep[1]; 1899 } 1900 1901 IF_ADDR_RUNLOCK(ifp); 1902 return NULL; 1903 } 1904 1905 /* 1906 * perform DAD when interface becomes IFF_UP. 1907 */ 1908 void 1909 in6_if_up(struct ifnet *ifp) 1910 { 1911 struct ifaddr *ifa; 1912 struct in6_ifaddr *ia; 1913 1914 IF_ADDR_RLOCK(ifp); 1915 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1916 if (ifa->ifa_addr->sa_family != AF_INET6) 1917 continue; 1918 ia = (struct in6_ifaddr *)ifa; 1919 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 1920 /* 1921 * The TENTATIVE flag was likely set by hand 1922 * beforehand, implicitly indicating the need for DAD. 1923 * We may be able to skip the random delay in this 1924 * case, but we impose delays just in case. 1925 */ 1926 nd6_dad_start(ifa, 1927 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 1928 } 1929 } 1930 IF_ADDR_RUNLOCK(ifp); 1931 1932 /* 1933 * special cases, like 6to4, are handled in in6_ifattach 1934 */ 1935 in6_ifattach(ifp, NULL); 1936 } 1937 1938 int 1939 in6if_do_dad(struct ifnet *ifp) 1940 { 1941 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 1942 return (0); 1943 1944 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) || 1945 (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD)) 1946 return (0); 1947 1948 /* 1949 * Our DAD routine requires the interface up and running. 1950 * However, some interfaces can be up before the RUNNING 1951 * status. Additionally, users may try to assign addresses 1952 * before the interface becomes up (or running). 1953 * This function returns EAGAIN in that case. 1954 * The caller should mark "tentative" on the address instead of 1955 * performing DAD immediately. 1956 */ 1957 if (!((ifp->if_flags & IFF_UP) && 1958 (ifp->if_drv_flags & IFF_DRV_RUNNING))) 1959 return (EAGAIN); 1960 1961 return (1); 1962 } 1963 1964 /* 1965 * Calculate max IPv6 MTU through all the interfaces and store it 1966 * to in6_maxmtu. 1967 */ 1968 void 1969 in6_setmaxmtu(void) 1970 { 1971 unsigned long maxmtu = 0; 1972 struct ifnet *ifp; 1973 1974 IFNET_RLOCK_NOSLEEP(); 1975 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1976 /* this function can be called during ifnet initialization */ 1977 if (!ifp->if_afdata[AF_INET6]) 1978 continue; 1979 if ((ifp->if_flags & IFF_LOOPBACK) == 0 && 1980 IN6_LINKMTU(ifp) > maxmtu) 1981 maxmtu = IN6_LINKMTU(ifp); 1982 } 1983 IFNET_RUNLOCK_NOSLEEP(); 1984 if (maxmtu) /* update only when maxmtu is positive */ 1985 V_in6_maxmtu = maxmtu; 1986 } 1987 1988 /* 1989 * Provide the length of interface identifiers to be used for the link attached 1990 * to the given interface. The length should be defined in "IPv6 over 1991 * xxx-link" document. Note that address architecture might also define 1992 * the length for a particular set of address prefixes, regardless of the 1993 * link type. As clarified in rfc2462bis, those two definitions should be 1994 * consistent, and those really are as of August 2004. 1995 */ 1996 int 1997 in6_if2idlen(struct ifnet *ifp) 1998 { 1999 switch (ifp->if_type) { 2000 case IFT_ETHER: /* RFC2464 */ 2001 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */ 2002 case IFT_L2VLAN: /* ditto */ 2003 case IFT_BRIDGE: /* bridge(4) only does Ethernet-like links */ 2004 case IFT_INFINIBAND: 2005 return (64); 2006 case IFT_PPP: /* RFC2472 */ 2007 return (64); 2008 case IFT_FRELAY: /* RFC2590 */ 2009 return (64); 2010 case IFT_IEEE1394: /* RFC3146 */ 2011 return (64); 2012 case IFT_GIF: 2013 return (64); /* draft-ietf-v6ops-mech-v2-07 */ 2014 case IFT_LOOP: 2015 return (64); /* XXX: is this really correct? */ 2016 default: 2017 /* 2018 * Unknown link type: 2019 * It might be controversial to use the today's common constant 2020 * of 64 for these cases unconditionally. For full compliance, 2021 * we should return an error in this case. On the other hand, 2022 * if we simply miss the standard for the link type or a new 2023 * standard is defined for a new link type, the IFID length 2024 * is very likely to be the common constant. As a compromise, 2025 * we always use the constant, but make an explicit notice 2026 * indicating the "unknown" case. 2027 */ 2028 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type); 2029 return (64); 2030 } 2031 } 2032 2033 #include <sys/sysctl.h> 2034 2035 struct in6_llentry { 2036 struct llentry base; 2037 }; 2038 2039 #define IN6_LLTBL_DEFAULT_HSIZE 32 2040 #define IN6_LLTBL_HASH(k, h) \ 2041 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 2042 2043 /* 2044 * Do actual deallocation of @lle. 2045 */ 2046 static void 2047 in6_lltable_destroy_lle_unlocked(struct llentry *lle) 2048 { 2049 2050 LLE_LOCK_DESTROY(lle); 2051 LLE_REQ_DESTROY(lle); 2052 free(lle, M_LLTABLE); 2053 } 2054 2055 /* 2056 * Called by LLE_FREE_LOCKED when number of references 2057 * drops to zero. 2058 */ 2059 static void 2060 in6_lltable_destroy_lle(struct llentry *lle) 2061 { 2062 2063 LLE_WUNLOCK(lle); 2064 in6_lltable_destroy_lle_unlocked(lle); 2065 } 2066 2067 static struct llentry * 2068 in6_lltable_new(const struct in6_addr *addr6, u_int flags) 2069 { 2070 struct in6_llentry *lle; 2071 2072 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 2073 if (lle == NULL) /* NB: caller generates msg */ 2074 return NULL; 2075 2076 lle->base.r_l3addr.addr6 = *addr6; 2077 lle->base.lle_refcnt = 1; 2078 lle->base.lle_free = in6_lltable_destroy_lle; 2079 LLE_LOCK_INIT(&lle->base); 2080 LLE_REQ_INIT(&lle->base); 2081 callout_init(&lle->base.lle_timer, 1); 2082 2083 return (&lle->base); 2084 } 2085 2086 static int 2087 in6_lltable_match_prefix(const struct sockaddr *saddr, 2088 const struct sockaddr *smask, u_int flags, struct llentry *lle) 2089 { 2090 const struct in6_addr *addr, *mask, *lle_addr; 2091 2092 addr = &((const struct sockaddr_in6 *)saddr)->sin6_addr; 2093 mask = &((const struct sockaddr_in6 *)smask)->sin6_addr; 2094 lle_addr = &lle->r_l3addr.addr6; 2095 2096 if (IN6_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0) 2097 return (0); 2098 2099 if (lle->la_flags & LLE_IFADDR) { 2100 2101 /* 2102 * Delete LLE_IFADDR records IFF address & flag matches. 2103 * Note that addr is the interface address within prefix 2104 * being matched. 2105 */ 2106 if (IN6_ARE_ADDR_EQUAL(addr, lle_addr) && 2107 (flags & LLE_STATIC) != 0) 2108 return (1); 2109 return (0); 2110 } 2111 2112 /* flags & LLE_STATIC means deleting both dynamic and static entries */ 2113 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC)) 2114 return (1); 2115 2116 return (0); 2117 } 2118 2119 static void 2120 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle) 2121 { 2122 struct ifnet *ifp; 2123 2124 LLE_WLOCK_ASSERT(lle); 2125 KASSERT(llt != NULL, ("lltable is NULL")); 2126 2127 /* Unlink entry from table */ 2128 if ((lle->la_flags & LLE_LINKED) != 0) { 2129 2130 ifp = llt->llt_ifp; 2131 IF_AFDATA_WLOCK_ASSERT(ifp); 2132 lltable_unlink_entry(llt, lle); 2133 } 2134 2135 if (callout_stop(&lle->lle_timer) > 0) 2136 LLE_REMREF(lle); 2137 2138 llentry_free(lle); 2139 } 2140 2141 static int 2142 in6_lltable_rtcheck(struct ifnet *ifp, 2143 u_int flags, 2144 const struct sockaddr *l3addr) 2145 { 2146 const struct sockaddr_in6 *sin6; 2147 struct nhop6_basic nh6; 2148 struct in6_addr dst; 2149 uint32_t scopeid; 2150 int error; 2151 char ip6buf[INET6_ADDRSTRLEN]; 2152 int fibnum; 2153 2154 KASSERT(l3addr->sa_family == AF_INET6, 2155 ("sin_family %d", l3addr->sa_family)); 2156 2157 sin6 = (const struct sockaddr_in6 *)l3addr; 2158 in6_splitscope(&sin6->sin6_addr, &dst, &scopeid); 2159 fibnum = V_rt_add_addr_allfibs ? RT_DEFAULT_FIB : ifp->if_fib; 2160 error = fib6_lookup_nh_basic(fibnum, &dst, scopeid, 0, 0, &nh6); 2161 if (error != 0 || (nh6.nh_flags & NHF_GATEWAY) || nh6.nh_ifp != ifp) { 2162 struct ifaddr *ifa; 2163 /* 2164 * Create an ND6 cache for an IPv6 neighbor 2165 * that is not covered by our own prefix. 2166 */ 2167 ifa = ifaof_ifpforaddr(l3addr, ifp); 2168 if (ifa != NULL) { 2169 ifa_free(ifa); 2170 return 0; 2171 } 2172 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2173 ip6_sprintf(ip6buf, &sin6->sin6_addr)); 2174 return EINVAL; 2175 } 2176 return 0; 2177 } 2178 2179 /* 2180 * Called by the datapath to indicate that the entry was used. 2181 */ 2182 static void 2183 in6_lltable_mark_used(struct llentry *lle) 2184 { 2185 2186 LLE_REQ_LOCK(lle); 2187 lle->r_skip_req = 0; 2188 2189 /* 2190 * Set the hit time so the callback function 2191 * can determine the remaining time before 2192 * transiting to the DELAY state. 2193 */ 2194 lle->lle_hittime = time_uptime; 2195 LLE_REQ_UNLOCK(lle); 2196 } 2197 2198 static inline uint32_t 2199 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize) 2200 { 2201 2202 return (IN6_LLTBL_HASH(dst->s6_addr32[3], hsize)); 2203 } 2204 2205 static uint32_t 2206 in6_lltable_hash(const struct llentry *lle, uint32_t hsize) 2207 { 2208 2209 return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize)); 2210 } 2211 2212 static void 2213 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 2214 { 2215 struct sockaddr_in6 *sin6; 2216 2217 sin6 = (struct sockaddr_in6 *)sa; 2218 bzero(sin6, sizeof(*sin6)); 2219 sin6->sin6_family = AF_INET6; 2220 sin6->sin6_len = sizeof(*sin6); 2221 sin6->sin6_addr = lle->r_l3addr.addr6; 2222 } 2223 2224 static inline struct llentry * 2225 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst) 2226 { 2227 struct llentry *lle; 2228 struct llentries *lleh; 2229 u_int hashidx; 2230 2231 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize); 2232 lleh = &llt->lle_head[hashidx]; 2233 LIST_FOREACH(lle, lleh, lle_next) { 2234 if (lle->la_flags & LLE_DELETED) 2235 continue; 2236 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst)) 2237 break; 2238 } 2239 2240 return (lle); 2241 } 2242 2243 static void 2244 in6_lltable_delete_entry(struct lltable *llt, struct llentry *lle) 2245 { 2246 2247 lle->la_flags |= LLE_DELETED; 2248 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 2249 #ifdef DIAGNOSTIC 2250 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2251 #endif 2252 llentry_free(lle); 2253 } 2254 2255 static struct llentry * 2256 in6_lltable_alloc(struct lltable *llt, u_int flags, 2257 const struct sockaddr *l3addr) 2258 { 2259 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2260 struct ifnet *ifp = llt->llt_ifp; 2261 struct llentry *lle; 2262 char linkhdr[LLE_MAX_LINKHDR]; 2263 size_t linkhdrsize; 2264 int lladdr_off; 2265 2266 KASSERT(l3addr->sa_family == AF_INET6, 2267 ("sin_family %d", l3addr->sa_family)); 2268 2269 /* 2270 * A route that covers the given address must have 2271 * been installed 1st because we are doing a resolution, 2272 * verify this. 2273 */ 2274 if (!(flags & LLE_IFADDR) && 2275 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2276 return (NULL); 2277 2278 lle = in6_lltable_new(&sin6->sin6_addr, flags); 2279 if (lle == NULL) { 2280 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2281 return (NULL); 2282 } 2283 lle->la_flags = flags; 2284 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 2285 linkhdrsize = LLE_MAX_LINKHDR; 2286 if (lltable_calc_llheader(ifp, AF_INET6, IF_LLADDR(ifp), 2287 linkhdr, &linkhdrsize, &lladdr_off) != 0) { 2288 in6_lltable_destroy_lle_unlocked(lle); 2289 return (NULL); 2290 } 2291 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize, 2292 lladdr_off); 2293 lle->la_flags |= LLE_STATIC; 2294 } 2295 2296 if ((lle->la_flags & LLE_STATIC) != 0) 2297 lle->ln_state = ND6_LLINFO_REACHABLE; 2298 2299 return (lle); 2300 } 2301 2302 static struct llentry * 2303 in6_lltable_lookup(struct lltable *llt, u_int flags, 2304 const struct sockaddr *l3addr) 2305 { 2306 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2307 struct llentry *lle; 2308 2309 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 2310 KASSERT(l3addr->sa_family == AF_INET6, 2311 ("sin_family %d", l3addr->sa_family)); 2312 2313 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2314 2315 if (lle == NULL) 2316 return (NULL); 2317 2318 KASSERT((flags & (LLE_UNLOCKED|LLE_EXCLUSIVE)) != 2319 (LLE_UNLOCKED|LLE_EXCLUSIVE),("wrong lle request flags: 0x%X", 2320 flags)); 2321 2322 if (flags & LLE_UNLOCKED) 2323 return (lle); 2324 2325 if (flags & LLE_EXCLUSIVE) 2326 LLE_WLOCK(lle); 2327 else 2328 LLE_RLOCK(lle); 2329 return (lle); 2330 } 2331 2332 static int 2333 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 2334 struct sysctl_req *wr) 2335 { 2336 struct ifnet *ifp = llt->llt_ifp; 2337 /* XXX stack use */ 2338 struct { 2339 struct rt_msghdr rtm; 2340 struct sockaddr_in6 sin6; 2341 /* 2342 * ndp.c assumes that sdl is word aligned 2343 */ 2344 #ifdef __LP64__ 2345 uint32_t pad; 2346 #endif 2347 struct sockaddr_dl sdl; 2348 } ndpc; 2349 struct sockaddr_dl *sdl; 2350 int error; 2351 2352 bzero(&ndpc, sizeof(ndpc)); 2353 /* skip deleted entries */ 2354 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 2355 return (0); 2356 /* Skip if jailed and not a valid IP of the prison. */ 2357 lltable_fill_sa_entry(lle, (struct sockaddr *)&ndpc.sin6); 2358 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&ndpc.sin6) != 0) 2359 return (0); 2360 /* 2361 * produce a msg made of: 2362 * struct rt_msghdr; 2363 * struct sockaddr_in6 (IPv6) 2364 * struct sockaddr_dl; 2365 */ 2366 ndpc.rtm.rtm_msglen = sizeof(ndpc); 2367 ndpc.rtm.rtm_version = RTM_VERSION; 2368 ndpc.rtm.rtm_type = RTM_GET; 2369 ndpc.rtm.rtm_flags = RTF_UP; 2370 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 2371 if (V_deembed_scopeid) 2372 sa6_recoverscope(&ndpc.sin6); 2373 2374 /* publish */ 2375 if (lle->la_flags & LLE_PUB) 2376 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE; 2377 2378 sdl = &ndpc.sdl; 2379 sdl->sdl_family = AF_LINK; 2380 sdl->sdl_len = sizeof(*sdl); 2381 sdl->sdl_index = ifp->if_index; 2382 sdl->sdl_type = ifp->if_type; 2383 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 2384 sdl->sdl_alen = ifp->if_addrlen; 2385 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 2386 } else { 2387 sdl->sdl_alen = 0; 2388 bzero(LLADDR(sdl), ifp->if_addrlen); 2389 } 2390 if (lle->la_expire != 0) 2391 ndpc.rtm.rtm_rmx.rmx_expire = lle->la_expire + 2392 lle->lle_remtime / hz + time_second - time_uptime; 2393 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 2394 if (lle->la_flags & LLE_STATIC) 2395 ndpc.rtm.rtm_flags |= RTF_STATIC; 2396 if (lle->la_flags & LLE_IFADDR) 2397 ndpc.rtm.rtm_flags |= RTF_PINNED; 2398 if (lle->ln_router != 0) 2399 ndpc.rtm.rtm_flags |= RTF_GATEWAY; 2400 ndpc.rtm.rtm_rmx.rmx_pksent = lle->la_asked; 2401 /* Store state in rmx_weight value */ 2402 ndpc.rtm.rtm_rmx.rmx_state = lle->ln_state; 2403 ndpc.rtm.rtm_index = ifp->if_index; 2404 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc)); 2405 2406 return (error); 2407 } 2408 2409 static struct lltable * 2410 in6_lltattach(struct ifnet *ifp) 2411 { 2412 struct lltable *llt; 2413 2414 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE); 2415 llt->llt_af = AF_INET6; 2416 llt->llt_ifp = ifp; 2417 2418 llt->llt_lookup = in6_lltable_lookup; 2419 llt->llt_alloc_entry = in6_lltable_alloc; 2420 llt->llt_delete_entry = in6_lltable_delete_entry; 2421 llt->llt_dump_entry = in6_lltable_dump_entry; 2422 llt->llt_hash = in6_lltable_hash; 2423 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry; 2424 llt->llt_free_entry = in6_lltable_free_entry; 2425 llt->llt_match_prefix = in6_lltable_match_prefix; 2426 llt->llt_mark_used = in6_lltable_mark_used; 2427 lltable_link(llt); 2428 2429 return (llt); 2430 } 2431 2432 void * 2433 in6_domifattach(struct ifnet *ifp) 2434 { 2435 struct in6_ifextra *ext; 2436 2437 /* There are not IPv6-capable interfaces. */ 2438 switch (ifp->if_type) { 2439 case IFT_PFLOG: 2440 case IFT_PFSYNC: 2441 case IFT_USB: 2442 return (NULL); 2443 } 2444 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2445 bzero(ext, sizeof(*ext)); 2446 2447 ext->in6_ifstat = malloc(sizeof(counter_u64_t) * 2448 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK); 2449 COUNTER_ARRAY_ALLOC(ext->in6_ifstat, 2450 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK); 2451 2452 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) * 2453 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR, 2454 M_WAITOK); 2455 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat, 2456 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK); 2457 2458 ext->nd_ifinfo = nd6_ifattach(ifp); 2459 ext->scope6_id = scope6_ifattach(ifp); 2460 ext->lltable = in6_lltattach(ifp); 2461 2462 ext->mld_ifinfo = mld_domifattach(ifp); 2463 2464 return ext; 2465 } 2466 2467 int 2468 in6_domifmtu(struct ifnet *ifp) 2469 { 2470 if (ifp->if_afdata[AF_INET6] == NULL) 2471 return ifp->if_mtu; 2472 2473 return (IN6_LINKMTU(ifp)); 2474 } 2475 2476 void 2477 in6_domifdetach(struct ifnet *ifp, void *aux) 2478 { 2479 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2480 2481 mld_domifdetach(ifp); 2482 scope6_ifdetach(ext->scope6_id); 2483 nd6_ifdetach(ifp, ext->nd_ifinfo); 2484 lltable_free(ext->lltable); 2485 COUNTER_ARRAY_FREE(ext->in6_ifstat, 2486 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 2487 free(ext->in6_ifstat, M_IFADDR); 2488 COUNTER_ARRAY_FREE(ext->icmp6_ifstat, 2489 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 2490 free(ext->icmp6_ifstat, M_IFADDR); 2491 free(ext, M_IFADDR); 2492 } 2493 2494 /* 2495 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2496 * v4 mapped addr or v4 compat addr 2497 */ 2498 void 2499 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2500 { 2501 2502 bzero(sin, sizeof(*sin)); 2503 sin->sin_len = sizeof(struct sockaddr_in); 2504 sin->sin_family = AF_INET; 2505 sin->sin_port = sin6->sin6_port; 2506 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2507 } 2508 2509 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2510 void 2511 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2512 { 2513 bzero(sin6, sizeof(*sin6)); 2514 sin6->sin6_len = sizeof(struct sockaddr_in6); 2515 sin6->sin6_family = AF_INET6; 2516 sin6->sin6_port = sin->sin_port; 2517 sin6->sin6_addr.s6_addr32[0] = 0; 2518 sin6->sin6_addr.s6_addr32[1] = 0; 2519 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2520 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2521 } 2522 2523 /* Convert sockaddr_in6 into sockaddr_in. */ 2524 void 2525 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2526 { 2527 struct sockaddr_in *sin_p; 2528 struct sockaddr_in6 sin6; 2529 2530 /* 2531 * Save original sockaddr_in6 addr and convert it 2532 * to sockaddr_in. 2533 */ 2534 sin6 = *(struct sockaddr_in6 *)nam; 2535 sin_p = (struct sockaddr_in *)nam; 2536 in6_sin6_2_sin(sin_p, &sin6); 2537 } 2538 2539 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2540 void 2541 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2542 { 2543 struct sockaddr_in *sin_p; 2544 struct sockaddr_in6 *sin6_p; 2545 2546 sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK); 2547 sin_p = (struct sockaddr_in *)*nam; 2548 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2549 free(*nam, M_SONAME); 2550 *nam = (struct sockaddr *)sin6_p; 2551 } 2552