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/sysctl.h> 88 #include <sys/syslog.h> 89 90 #include <net/if.h> 91 #include <net/if_var.h> 92 #include <net/if_types.h> 93 #include <net/route.h> 94 #include <net/if_dl.h> 95 #include <net/vnet.h> 96 97 #include <netinet/in.h> 98 #include <netinet/in_var.h> 99 #include <net/if_llatbl.h> 100 #include <netinet/if_ether.h> 101 #include <netinet/in_systm.h> 102 #include <netinet/ip.h> 103 #include <netinet/in_pcb.h> 104 #include <netinet/ip_carp.h> 105 106 #include <netinet/ip6.h> 107 #include <netinet6/ip6_var.h> 108 #include <netinet6/nd6.h> 109 #include <netinet6/mld6_var.h> 110 #include <netinet6/ip6_mroute.h> 111 #include <netinet6/in6_ifattach.h> 112 #include <netinet6/scope6_var.h> 113 #include <netinet6/in6_fib.h> 114 #include <netinet6/in6_pcb.h> 115 116 117 /* 118 * struct in6_ifreq and struct ifreq must be type punnable for common members 119 * of ifr_ifru to allow accessors to be shared. 120 */ 121 _Static_assert(offsetof(struct in6_ifreq, ifr_ifru) == 122 offsetof(struct ifreq, ifr_ifru), 123 "struct in6_ifreq and struct ifreq are not type punnable"); 124 125 VNET_DECLARE(int, icmp6_nodeinfo_oldmcprefix); 126 #define V_icmp6_nodeinfo_oldmcprefix VNET(icmp6_nodeinfo_oldmcprefix) 127 128 /* 129 * Definitions of some costant IP6 addresses. 130 */ 131 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 132 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 133 const struct in6_addr in6addr_nodelocal_allnodes = 134 IN6ADDR_NODELOCAL_ALLNODES_INIT; 135 const struct in6_addr in6addr_linklocal_allnodes = 136 IN6ADDR_LINKLOCAL_ALLNODES_INIT; 137 const struct in6_addr in6addr_linklocal_allrouters = 138 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 139 const struct in6_addr in6addr_linklocal_allv2routers = 140 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT; 141 142 const struct in6_addr in6mask0 = IN6MASK0; 143 const struct in6_addr in6mask32 = IN6MASK32; 144 const struct in6_addr in6mask64 = IN6MASK64; 145 const struct in6_addr in6mask96 = IN6MASK96; 146 const struct in6_addr in6mask128 = IN6MASK128; 147 148 const struct sockaddr_in6 sa6_any = 149 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 }; 150 151 static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *, 152 struct in6_aliasreq *, int); 153 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *); 154 155 static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *, 156 struct in6_ifaddr *, int); 157 static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *, 158 struct in6_aliasreq *, int flags); 159 static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *, 160 struct in6_ifaddr *, int, int); 161 static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *, 162 struct in6_ifaddr *, int); 163 164 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa)) 165 #define ia62ifa(ia6) (&((ia6)->ia_ifa)) 166 167 168 void 169 in6_newaddrmsg(struct in6_ifaddr *ia, int cmd) 170 { 171 struct rt_addrinfo info; 172 struct ifaddr *ifa; 173 struct sockaddr_dl gateway; 174 int fibnum; 175 176 ifa = &ia->ia_ifa; 177 178 /* 179 * Prepare info data for the host route. 180 * This code mimics one from ifa_maintain_loopback_route(). 181 */ 182 bzero(&info, sizeof(struct rt_addrinfo)); 183 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED; 184 info.rti_info[RTAX_DST] = ifa->ifa_addr; 185 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&gateway; 186 link_init_sdl(ifa->ifa_ifp, (struct sockaddr *)&gateway, ifa->ifa_ifp->if_type); 187 if (cmd != RTM_DELETE) 188 info.rti_ifp = V_loif; 189 190 191 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS : ia62ifa(ia)->ifa_ifp->if_fib; 192 193 if (cmd == RTM_ADD) { 194 rt_addrmsg(cmd, &ia->ia_ifa, fibnum); 195 rt_routemsg_info(cmd, &info, fibnum); 196 } else if (cmd == RTM_DELETE) { 197 rt_routemsg_info(cmd, &info, fibnum); 198 rt_addrmsg(cmd, &ia->ia_ifa, fibnum); 199 } 200 } 201 202 int 203 in6_mask2len(struct in6_addr *mask, u_char *lim0) 204 { 205 int x = 0, y; 206 u_char *lim = lim0, *p; 207 208 /* ignore the scope_id part */ 209 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask)) 210 lim = (u_char *)mask + sizeof(*mask); 211 for (p = (u_char *)mask; p < lim; x++, p++) { 212 if (*p != 0xff) 213 break; 214 } 215 y = 0; 216 if (p < lim) { 217 for (y = 0; y < 8; y++) { 218 if ((*p & (0x80 >> y)) == 0) 219 break; 220 } 221 } 222 223 /* 224 * when the limit pointer is given, do a stricter check on the 225 * remaining bits. 226 */ 227 if (p < lim) { 228 if (y != 0 && (*p & (0x00ff >> y)) != 0) 229 return (-1); 230 for (p = p + 1; p < lim; p++) 231 if (*p != 0) 232 return (-1); 233 } 234 235 return x * 8 + y; 236 } 237 238 #ifdef COMPAT_FREEBSD32 239 struct in6_ndifreq32 { 240 char ifname[IFNAMSIZ]; 241 uint32_t ifindex; 242 }; 243 #define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32) 244 #endif 245 246 int 247 in6_control(struct socket *so, u_long cmd, caddr_t data, 248 struct ifnet *ifp, struct thread *td) 249 { 250 struct in6_ifreq *ifr = (struct in6_ifreq *)data; 251 struct in6_ifaddr *ia = NULL; 252 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data; 253 struct sockaddr_in6 *sa6; 254 int carp_attached = 0; 255 int error; 256 u_long ocmd = cmd; 257 258 /* 259 * Compat to make pre-10.x ifconfig(8) operable. 260 */ 261 if (cmd == OSIOCAIFADDR_IN6) 262 cmd = SIOCAIFADDR_IN6; 263 264 switch (cmd) { 265 case SIOCGETSGCNT_IN6: 266 case SIOCGETMIFCNT_IN6: 267 /* 268 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c. 269 * We cannot see how that would be needed, so do not adjust the 270 * KPI blindly; more likely should clean up the IPv4 variant. 271 */ 272 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP); 273 } 274 275 switch (cmd) { 276 case SIOCAADDRCTL_POLICY: 277 case SIOCDADDRCTL_POLICY: 278 if (td != NULL) { 279 error = priv_check(td, PRIV_NETINET_ADDRCTRL6); 280 if (error) 281 return (error); 282 } 283 return (in6_src_ioctl(cmd, data)); 284 } 285 286 if (ifp == NULL) 287 return (EOPNOTSUPP); 288 289 switch (cmd) { 290 case SIOCSNDFLUSH_IN6: 291 case SIOCSPFXFLUSH_IN6: 292 case SIOCSRTRFLUSH_IN6: 293 case SIOCSDEFIFACE_IN6: 294 case SIOCSIFINFO_FLAGS: 295 case SIOCSIFINFO_IN6: 296 if (td != NULL) { 297 error = priv_check(td, PRIV_NETINET_ND6); 298 if (error) 299 return (error); 300 } 301 /* FALLTHROUGH */ 302 case OSIOCGIFINFO_IN6: 303 case SIOCGIFINFO_IN6: 304 case SIOCGNBRINFO_IN6: 305 case SIOCGDEFIFACE_IN6: 306 return (nd6_ioctl(cmd, data, ifp)); 307 308 #ifdef COMPAT_FREEBSD32 309 case SIOCGDEFIFACE32_IN6: 310 { 311 struct in6_ndifreq ndif; 312 struct in6_ndifreq32 *ndif32; 313 314 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif, 315 ifp); 316 if (error) 317 return (error); 318 ndif32 = (struct in6_ndifreq32 *)data; 319 ndif32->ifindex = ndif.ifindex; 320 return (0); 321 } 322 #endif 323 } 324 325 switch (cmd) { 326 case SIOCSIFPREFIX_IN6: 327 case SIOCDIFPREFIX_IN6: 328 case SIOCAIFPREFIX_IN6: 329 case SIOCCIFPREFIX_IN6: 330 case SIOCSGIFPREFIX_IN6: 331 case SIOCGIFPREFIX_IN6: 332 log(LOG_NOTICE, 333 "prefix ioctls are now invalidated. " 334 "please use ifconfig.\n"); 335 return (EOPNOTSUPP); 336 } 337 338 switch (cmd) { 339 case SIOCSSCOPE6: 340 if (td != NULL) { 341 error = priv_check(td, PRIV_NETINET_SCOPE6); 342 if (error) 343 return (error); 344 } 345 /* FALLTHROUGH */ 346 case SIOCGSCOPE6: 347 case SIOCGSCOPE6DEF: 348 return (scope6_ioctl(cmd, data, ifp)); 349 } 350 351 /* 352 * Find address for this interface, if it exists. 353 * 354 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation 355 * only, and used the first interface address as the target of other 356 * operations (without checking ifra_addr). This was because netinet 357 * code/API assumed at most 1 interface address per interface. 358 * Since IPv6 allows a node to assign multiple addresses 359 * on a single interface, we almost always look and check the 360 * presence of ifra_addr, and reject invalid ones here. 361 * It also decreases duplicated code among SIOC*_IN6 operations. 362 */ 363 switch (cmd) { 364 case SIOCAIFADDR_IN6: 365 case SIOCSIFPHYADDR_IN6: 366 sa6 = &ifra->ifra_addr; 367 break; 368 case SIOCSIFADDR_IN6: 369 case SIOCGIFADDR_IN6: 370 case SIOCSIFDSTADDR_IN6: 371 case SIOCSIFNETMASK_IN6: 372 case SIOCGIFDSTADDR_IN6: 373 case SIOCGIFNETMASK_IN6: 374 case SIOCDIFADDR_IN6: 375 case SIOCGIFPSRCADDR_IN6: 376 case SIOCGIFPDSTADDR_IN6: 377 case SIOCGIFAFLAG_IN6: 378 case SIOCSNDFLUSH_IN6: 379 case SIOCSPFXFLUSH_IN6: 380 case SIOCSRTRFLUSH_IN6: 381 case SIOCGIFALIFETIME_IN6: 382 case SIOCGIFSTAT_IN6: 383 case SIOCGIFSTAT_ICMP6: 384 sa6 = &ifr->ifr_addr; 385 break; 386 case SIOCSIFADDR: 387 case SIOCSIFBRDADDR: 388 case SIOCSIFDSTADDR: 389 case SIOCSIFNETMASK: 390 /* 391 * Although we should pass any non-INET6 ioctl requests 392 * down to driver, we filter some legacy INET requests. 393 * Drivers trust SIOCSIFADDR et al to come from an already 394 * privileged layer, and do not perform any credentials 395 * checks or input validation. 396 */ 397 return (EINVAL); 398 default: 399 sa6 = NULL; 400 break; 401 } 402 if (sa6 && sa6->sin6_family == AF_INET6) { 403 if (sa6->sin6_scope_id != 0) 404 error = sa6_embedscope(sa6, 0); 405 else 406 error = in6_setscope(&sa6->sin6_addr, ifp, NULL); 407 if (error != 0) 408 return (error); 409 if (td != NULL && (error = prison_check_ip6(td->td_ucred, 410 &sa6->sin6_addr)) != 0) 411 return (error); 412 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr); 413 } else 414 ia = NULL; 415 416 switch (cmd) { 417 case SIOCSIFADDR_IN6: 418 case SIOCSIFDSTADDR_IN6: 419 case SIOCSIFNETMASK_IN6: 420 /* 421 * Since IPv6 allows a node to assign multiple addresses 422 * on a single interface, SIOCSIFxxx ioctls are deprecated. 423 */ 424 /* we decided to obsolete this command (20000704) */ 425 error = EINVAL; 426 goto out; 427 428 case SIOCDIFADDR_IN6: 429 /* 430 * for IPv4, we look for existing in_ifaddr here to allow 431 * "ifconfig if0 delete" to remove the first IPv4 address on 432 * the interface. For IPv6, as the spec allows multiple 433 * interface address from the day one, we consider "remove the 434 * first one" semantics to be not preferable. 435 */ 436 if (ia == NULL) { 437 error = EADDRNOTAVAIL; 438 goto out; 439 } 440 /* FALLTHROUGH */ 441 case SIOCAIFADDR_IN6: 442 /* 443 * We always require users to specify a valid IPv6 address for 444 * the corresponding operation. 445 */ 446 if (ifra->ifra_addr.sin6_family != AF_INET6 || 447 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) { 448 error = EAFNOSUPPORT; 449 goto out; 450 } 451 452 if (td != NULL) { 453 error = priv_check(td, (cmd == SIOCDIFADDR_IN6) ? 454 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR); 455 if (error) 456 goto out; 457 } 458 /* FALLTHROUGH */ 459 case SIOCGIFSTAT_IN6: 460 case SIOCGIFSTAT_ICMP6: 461 if (ifp->if_afdata[AF_INET6] == NULL) { 462 error = EPFNOSUPPORT; 463 goto out; 464 } 465 break; 466 467 case SIOCGIFADDR_IN6: 468 /* This interface is basically deprecated. use SIOCGIFCONF. */ 469 /* FALLTHROUGH */ 470 case SIOCGIFAFLAG_IN6: 471 case SIOCGIFNETMASK_IN6: 472 case SIOCGIFDSTADDR_IN6: 473 case SIOCGIFALIFETIME_IN6: 474 /* must think again about its semantics */ 475 if (ia == NULL) { 476 error = EADDRNOTAVAIL; 477 goto out; 478 } 479 break; 480 } 481 482 switch (cmd) { 483 case SIOCGIFADDR_IN6: 484 ifr->ifr_addr = ia->ia_addr; 485 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0) 486 goto out; 487 break; 488 489 case SIOCGIFDSTADDR_IN6: 490 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 491 error = EINVAL; 492 goto out; 493 } 494 ifr->ifr_dstaddr = ia->ia_dstaddr; 495 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0) 496 goto out; 497 break; 498 499 case SIOCGIFNETMASK_IN6: 500 ifr->ifr_addr = ia->ia_prefixmask; 501 break; 502 503 case SIOCGIFAFLAG_IN6: 504 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags; 505 break; 506 507 case SIOCGIFSTAT_IN6: 508 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 509 ifp->if_afdata[AF_INET6])->in6_ifstat, 510 &ifr->ifr_ifru.ifru_stat, 511 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 512 break; 513 514 case SIOCGIFSTAT_ICMP6: 515 COUNTER_ARRAY_COPY(((struct in6_ifextra *) 516 ifp->if_afdata[AF_INET6])->icmp6_ifstat, 517 &ifr->ifr_ifru.ifru_icmp6stat, 518 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 519 break; 520 521 case SIOCGIFALIFETIME_IN6: 522 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime; 523 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 524 time_t maxexpire; 525 struct in6_addrlifetime *retlt = 526 &ifr->ifr_ifru.ifru_lifetime; 527 528 /* 529 * XXX: adjust expiration time assuming time_t is 530 * signed. 531 */ 532 maxexpire = (-1) & 533 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 534 if (ia->ia6_lifetime.ia6t_vltime < 535 maxexpire - ia->ia6_updatetime) { 536 retlt->ia6t_expire = ia->ia6_updatetime + 537 ia->ia6_lifetime.ia6t_vltime; 538 } else 539 retlt->ia6t_expire = maxexpire; 540 } 541 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 542 time_t maxexpire; 543 struct in6_addrlifetime *retlt = 544 &ifr->ifr_ifru.ifru_lifetime; 545 546 /* 547 * XXX: adjust expiration time assuming time_t is 548 * signed. 549 */ 550 maxexpire = (-1) & 551 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 552 if (ia->ia6_lifetime.ia6t_pltime < 553 maxexpire - ia->ia6_updatetime) { 554 retlt->ia6t_preferred = ia->ia6_updatetime + 555 ia->ia6_lifetime.ia6t_pltime; 556 } else 557 retlt->ia6t_preferred = maxexpire; 558 } 559 break; 560 561 case SIOCAIFADDR_IN6: 562 { 563 struct nd_prefixctl pr0; 564 struct nd_prefix *pr; 565 566 /* 567 * first, make or update the interface address structure, 568 * and link it to the list. 569 */ 570 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0) 571 goto out; 572 if (ia != NULL) { 573 if (ia->ia_ifa.ifa_carp) 574 (*carp_detach_p)(&ia->ia_ifa, true); 575 ifa_free(&ia->ia_ifa); 576 } 577 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) 578 == NULL) { 579 /* 580 * this can happen when the user specify the 0 valid 581 * lifetime. 582 */ 583 break; 584 } 585 586 if (cmd == ocmd && ifra->ifra_vhid > 0) { 587 if (carp_attach_p != NULL) 588 error = (*carp_attach_p)(&ia->ia_ifa, 589 ifra->ifra_vhid); 590 else 591 error = EPROTONOSUPPORT; 592 if (error) 593 goto out; 594 else 595 carp_attached = 1; 596 } 597 598 /* 599 * then, make the prefix on-link on the interface. 600 * XXX: we'd rather create the prefix before the address, but 601 * we need at least one address to install the corresponding 602 * interface route, so we configure the address first. 603 */ 604 605 /* 606 * convert mask to prefix length (prefixmask has already 607 * been validated in in6_update_ifa(). 608 */ 609 bzero(&pr0, sizeof(pr0)); 610 pr0.ndpr_ifp = ifp; 611 pr0.ndpr_plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 612 NULL); 613 if (pr0.ndpr_plen == 128) { 614 /* we don't need to install a host route. */ 615 goto aifaddr_out; 616 } 617 pr0.ndpr_prefix = ifra->ifra_addr; 618 /* apply the mask for safety. */ 619 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, 620 &ifra->ifra_prefixmask.sin6_addr); 621 622 /* 623 * XXX: since we don't have an API to set prefix (not address) 624 * lifetimes, we just use the same lifetimes as addresses. 625 * The (temporarily) installed lifetimes can be overridden by 626 * later advertised RAs (when accept_rtadv is non 0), which is 627 * an intended behavior. 628 */ 629 pr0.ndpr_raf_onlink = 1; /* should be configurable? */ 630 pr0.ndpr_raf_auto = 631 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0); 632 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime; 633 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime; 634 635 /* add the prefix if not yet. */ 636 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 637 /* 638 * nd6_prelist_add will install the corresponding 639 * interface route. 640 */ 641 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) { 642 if (carp_attached) 643 (*carp_detach_p)(&ia->ia_ifa, false); 644 goto out; 645 } 646 } 647 648 /* relate the address to the prefix */ 649 if (ia->ia6_ndpr == NULL) { 650 ia->ia6_ndpr = pr; 651 pr->ndpr_addrcnt++; 652 653 /* 654 * If this is the first autoconf address from the 655 * prefix, create a temporary address as well 656 * (when required). 657 */ 658 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) && 659 V_ip6_use_tempaddr && pr->ndpr_addrcnt == 1) { 660 int e; 661 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) { 662 log(LOG_NOTICE, "in6_control: failed " 663 "to create a temporary address, " 664 "errno=%d\n", e); 665 } 666 } 667 } 668 nd6_prefix_rele(pr); 669 670 /* 671 * this might affect the status of autoconfigured addresses, 672 * that is, this address might make other addresses detached. 673 */ 674 pfxlist_onlink_check(); 675 676 aifaddr_out: 677 /* 678 * Try to clear the flag when a new IPv6 address is added 679 * onto an IFDISABLED interface and it succeeds. 680 */ 681 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) { 682 struct in6_ndireq nd; 683 684 memset(&nd, 0, sizeof(nd)); 685 nd.ndi.flags = ND_IFINFO(ifp)->flags; 686 nd.ndi.flags &= ~ND6_IFF_IFDISABLED; 687 if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0) 688 log(LOG_NOTICE, "SIOCAIFADDR_IN6: " 689 "SIOCSIFINFO_FLAGS for -ifdisabled " 690 "failed."); 691 /* 692 * Ignore failure of clearing the flag intentionally. 693 * The failure means address duplication was detected. 694 */ 695 } 696 break; 697 } 698 699 case SIOCDIFADDR_IN6: 700 { 701 struct nd_prefix *pr; 702 703 /* 704 * If the address being deleted is the only one that owns 705 * the corresponding prefix, expire the prefix as well. 706 * XXX: theoretically, we don't have to worry about such 707 * relationship, since we separate the address management 708 * and the prefix management. We do this, however, to provide 709 * as much backward compatibility as possible in terms of 710 * the ioctl operation. 711 * Note that in6_purgeaddr() will decrement ndpr_addrcnt. 712 */ 713 pr = ia->ia6_ndpr; 714 in6_purgeaddr(&ia->ia_ifa); 715 if (pr != NULL && pr->ndpr_addrcnt == 0) { 716 ND6_WLOCK(); 717 nd6_prefix_unlink(pr, NULL); 718 ND6_WUNLOCK(); 719 nd6_prefix_del(pr); 720 } 721 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa, 722 IFADDR_EVENT_DEL); 723 break; 724 } 725 726 default: 727 if (ifp->if_ioctl == NULL) { 728 error = EOPNOTSUPP; 729 goto out; 730 } 731 error = (*ifp->if_ioctl)(ifp, cmd, data); 732 goto out; 733 } 734 735 error = 0; 736 out: 737 if (ia != NULL) 738 ifa_free(&ia->ia_ifa); 739 return (error); 740 } 741 742 743 static struct in6_multi_mship * 744 in6_joingroup_legacy(struct ifnet *ifp, const struct in6_addr *mcaddr, 745 int *errorp, int delay) 746 { 747 struct in6_multi_mship *imm; 748 int error; 749 750 imm = malloc(sizeof(*imm), M_IP6MADDR, M_NOWAIT); 751 if (imm == NULL) { 752 *errorp = ENOBUFS; 753 return (NULL); 754 } 755 756 delay = (delay * PR_FASTHZ) / hz; 757 758 error = in6_joingroup(ifp, mcaddr, NULL, &imm->i6mm_maddr, delay); 759 if (error) { 760 *errorp = error; 761 free(imm, M_IP6MADDR); 762 return (NULL); 763 } 764 765 return (imm); 766 } 767 /* 768 * Join necessary multicast groups. Factored out from in6_update_ifa(). 769 * This entire work should only be done once, for the default FIB. 770 */ 771 static int 772 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra, 773 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol) 774 { 775 char ip6buf[INET6_ADDRSTRLEN]; 776 struct in6_addr mltaddr; 777 struct in6_multi_mship *imm; 778 int delay, error; 779 780 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__)); 781 782 /* Join solicited multicast addr for new host id. */ 783 bzero(&mltaddr, sizeof(struct in6_addr)); 784 mltaddr.s6_addr32[0] = IPV6_ADDR_INT32_MLL; 785 mltaddr.s6_addr32[2] = htonl(1); 786 mltaddr.s6_addr32[3] = ifra->ifra_addr.sin6_addr.s6_addr32[3]; 787 mltaddr.s6_addr8[12] = 0xff; 788 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) { 789 /* XXX: should not happen */ 790 log(LOG_ERR, "%s: in6_setscope failed\n", __func__); 791 goto cleanup; 792 } 793 delay = error = 0; 794 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 795 /* 796 * We need a random delay for DAD on the address being 797 * configured. It also means delaying transmission of the 798 * corresponding MLD report to avoid report collision. 799 * [RFC 4861, Section 6.3.7] 800 */ 801 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 802 } 803 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay); 804 if (imm == NULL) { 805 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 806 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 807 if_name(ifp), error)); 808 goto cleanup; 809 } 810 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 811 *in6m_sol = imm->i6mm_maddr; 812 813 /* 814 * Join link-local all-nodes address. 815 */ 816 mltaddr = in6addr_linklocal_allnodes; 817 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 818 goto cleanup; /* XXX: should not fail */ 819 820 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, 0); 821 if (imm == NULL) { 822 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 823 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr), 824 if_name(ifp), error)); 825 goto cleanup; 826 } 827 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 828 829 /* 830 * Join node information group address. 831 */ 832 delay = 0; 833 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 834 /* 835 * The spec does not say anything about delay for this group, 836 * but the same logic should apply. 837 */ 838 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 839 } 840 if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) { 841 /* XXX jinmei */ 842 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay); 843 if (imm == NULL) 844 nd6log((LOG_WARNING, 845 "%s: in6_joingroup failed for %s on %s " 846 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 847 &mltaddr), if_name(ifp), error)); 848 /* XXX not very fatal, go on... */ 849 else 850 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 851 } 852 if (V_icmp6_nodeinfo_oldmcprefix && 853 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) { 854 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay); 855 if (imm == NULL) 856 nd6log((LOG_WARNING, 857 "%s: in6_joingroup failed for %s on %s " 858 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 859 &mltaddr), if_name(ifp), error)); 860 /* XXX not very fatal, go on... */ 861 else 862 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 863 } 864 865 /* 866 * Join interface-local all-nodes address. 867 * (ff01::1%ifN, and ff01::%ifN/32) 868 */ 869 mltaddr = in6addr_nodelocal_allnodes; 870 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0) 871 goto cleanup; /* XXX: should not fail */ 872 873 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, 0); 874 if (imm == NULL) { 875 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s " 876 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, 877 &mltaddr), if_name(ifp), error)); 878 goto cleanup; 879 } 880 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain); 881 882 cleanup: 883 return (error); 884 } 885 886 /* 887 * Update parameters of an IPv6 interface address. 888 * If necessary, a new entry is created and linked into address chains. 889 * This function is separated from in6_control(). 890 */ 891 int 892 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 893 struct in6_ifaddr *ia, int flags) 894 { 895 int error, hostIsNew = 0; 896 897 if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0) 898 return (error); 899 900 if (ia == NULL) { 901 hostIsNew = 1; 902 if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL) 903 return (ENOBUFS); 904 } 905 906 error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags); 907 if (error != 0) { 908 if (hostIsNew != 0) { 909 in6_unlink_ifa(ia, ifp); 910 ifa_free(&ia->ia_ifa); 911 } 912 return (error); 913 } 914 915 if (hostIsNew) 916 error = in6_broadcast_ifa(ifp, ifra, ia, flags); 917 918 return (error); 919 } 920 921 /* 922 * Fill in basic IPv6 address request info. 923 */ 924 void 925 in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr, 926 const struct in6_addr *mask) 927 { 928 929 memset(ifra, 0, sizeof(struct in6_aliasreq)); 930 931 ifra->ifra_addr.sin6_family = AF_INET6; 932 ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 933 if (addr != NULL) 934 ifra->ifra_addr.sin6_addr = *addr; 935 936 ifra->ifra_prefixmask.sin6_family = AF_INET6; 937 ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 938 if (mask != NULL) 939 ifra->ifra_prefixmask.sin6_addr = *mask; 940 } 941 942 static int 943 in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra, 944 struct in6_ifaddr *ia, int flags) 945 { 946 int plen = -1; 947 struct sockaddr_in6 dst6; 948 struct in6_addrlifetime *lt; 949 char ip6buf[INET6_ADDRSTRLEN]; 950 951 /* Validate parameters */ 952 if (ifp == NULL || ifra == NULL) /* this maybe redundant */ 953 return (EINVAL); 954 955 /* 956 * The destination address for a p2p link must have a family 957 * of AF_UNSPEC or AF_INET6. 958 */ 959 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 960 ifra->ifra_dstaddr.sin6_family != AF_INET6 && 961 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC) 962 return (EAFNOSUPPORT); 963 964 /* 965 * Validate address 966 */ 967 if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) || 968 ifra->ifra_addr.sin6_family != AF_INET6) 969 return (EINVAL); 970 971 /* 972 * validate ifra_prefixmask. don't check sin6_family, netmask 973 * does not carry fields other than sin6_len. 974 */ 975 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6)) 976 return (EINVAL); 977 /* 978 * Because the IPv6 address architecture is classless, we require 979 * users to specify a (non 0) prefix length (mask) for a new address. 980 * We also require the prefix (when specified) mask is valid, and thus 981 * reject a non-consecutive mask. 982 */ 983 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0) 984 return (EINVAL); 985 if (ifra->ifra_prefixmask.sin6_len != 0) { 986 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, 987 (u_char *)&ifra->ifra_prefixmask + 988 ifra->ifra_prefixmask.sin6_len); 989 if (plen <= 0) 990 return (EINVAL); 991 } else { 992 /* 993 * In this case, ia must not be NULL. We just use its prefix 994 * length. 995 */ 996 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); 997 } 998 /* 999 * If the destination address on a p2p interface is specified, 1000 * and the address is a scoped one, validate/set the scope 1001 * zone identifier. 1002 */ 1003 dst6 = ifra->ifra_dstaddr; 1004 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 && 1005 (dst6.sin6_family == AF_INET6)) { 1006 struct in6_addr in6_tmp; 1007 u_int32_t zoneid; 1008 1009 in6_tmp = dst6.sin6_addr; 1010 if (in6_setscope(&in6_tmp, ifp, &zoneid)) 1011 return (EINVAL); /* XXX: should be impossible */ 1012 1013 if (dst6.sin6_scope_id != 0) { 1014 if (dst6.sin6_scope_id != zoneid) 1015 return (EINVAL); 1016 } else /* user omit to specify the ID. */ 1017 dst6.sin6_scope_id = zoneid; 1018 1019 /* convert into the internal form */ 1020 if (sa6_embedscope(&dst6, 0)) 1021 return (EINVAL); /* XXX: should be impossible */ 1022 } 1023 /* Modify original ifra_dstaddr to reflect changes */ 1024 ifra->ifra_dstaddr = dst6; 1025 1026 /* 1027 * The destination address can be specified only for a p2p or a 1028 * loopback interface. If specified, the corresponding prefix length 1029 * must be 128. 1030 */ 1031 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) { 1032 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) { 1033 /* XXX: noisy message */ 1034 nd6log((LOG_INFO, "in6_update_ifa: a destination can " 1035 "be specified for a p2p or a loopback IF only\n")); 1036 return (EINVAL); 1037 } 1038 if (plen != 128) { 1039 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should " 1040 "be 128 when dstaddr is specified\n")); 1041 return (EINVAL); 1042 } 1043 } 1044 /* lifetime consistency check */ 1045 lt = &ifra->ifra_lifetime; 1046 if (lt->ia6t_pltime > lt->ia6t_vltime) 1047 return (EINVAL); 1048 if (lt->ia6t_vltime == 0) { 1049 /* 1050 * the following log might be noisy, but this is a typical 1051 * configuration mistake or a tool's bug. 1052 */ 1053 nd6log((LOG_INFO, 1054 "in6_update_ifa: valid lifetime is 0 for %s\n", 1055 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr))); 1056 1057 if (ia == NULL) 1058 return (0); /* there's nothing to do */ 1059 } 1060 1061 /* Check prefix mask */ 1062 if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) { 1063 /* 1064 * We prohibit changing the prefix length of an existing 1065 * address, because 1066 * + such an operation should be rare in IPv6, and 1067 * + the operation would confuse prefix management. 1068 */ 1069 if (ia->ia_prefixmask.sin6_len != 0 && 1070 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) { 1071 nd6log((LOG_INFO, "in6_validate_ifa: the prefix length " 1072 "of an existing %s address should not be changed\n", 1073 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1074 1075 return (EINVAL); 1076 } 1077 } 1078 1079 return (0); 1080 } 1081 1082 1083 /* 1084 * Allocate a new ifaddr and link it into chains. 1085 */ 1086 static struct in6_ifaddr * 1087 in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags) 1088 { 1089 struct in6_ifaddr *ia; 1090 1091 /* 1092 * When in6_alloc_ifa() is called in a process of a received 1093 * RA, it is called under an interrupt context. So, we should 1094 * call malloc with M_NOWAIT. 1095 */ 1096 ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT); 1097 if (ia == NULL) 1098 return (NULL); 1099 LIST_INIT(&ia->ia6_memberships); 1100 /* Initialize the address and masks, and put time stamp */ 1101 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1102 ia->ia_addr.sin6_family = AF_INET6; 1103 ia->ia_addr.sin6_len = sizeof(ia->ia_addr); 1104 /* XXX: Can we assign ,sin6_addr and skip the rest? */ 1105 ia->ia_addr = ifra->ifra_addr; 1106 ia->ia6_createtime = time_uptime; 1107 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) { 1108 /* 1109 * Some functions expect that ifa_dstaddr is not 1110 * NULL for p2p interfaces. 1111 */ 1112 ia->ia_ifa.ifa_dstaddr = 1113 (struct sockaddr *)&ia->ia_dstaddr; 1114 } else { 1115 ia->ia_ifa.ifa_dstaddr = NULL; 1116 } 1117 1118 /* set prefix mask if any */ 1119 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 1120 if (ifra->ifra_prefixmask.sin6_len != 0) { 1121 ia->ia_prefixmask.sin6_family = AF_INET6; 1122 ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len; 1123 ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr; 1124 } 1125 1126 ia->ia_ifp = ifp; 1127 ifa_ref(&ia->ia_ifa); /* if_addrhead */ 1128 IF_ADDR_WLOCK(ifp); 1129 CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link); 1130 IF_ADDR_WUNLOCK(ifp); 1131 1132 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */ 1133 IN6_IFADDR_WLOCK(); 1134 CK_STAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link); 1135 CK_LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash); 1136 IN6_IFADDR_WUNLOCK(); 1137 1138 return (ia); 1139 } 1140 1141 /* 1142 * Update/configure interface address parameters: 1143 * 1144 * 1) Update lifetime 1145 * 2) Update interface metric ad flags 1146 * 3) Notify other subsystems 1147 */ 1148 static int 1149 in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra, 1150 struct in6_ifaddr *ia, int hostIsNew, int flags) 1151 { 1152 int error; 1153 1154 /* update timestamp */ 1155 ia->ia6_updatetime = time_uptime; 1156 1157 /* 1158 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred 1159 * to see if the address is deprecated or invalidated, but initialize 1160 * these members for applications. 1161 */ 1162 ia->ia6_lifetime = ifra->ifra_lifetime; 1163 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 1164 ia->ia6_lifetime.ia6t_expire = 1165 time_uptime + ia->ia6_lifetime.ia6t_vltime; 1166 } else 1167 ia->ia6_lifetime.ia6t_expire = 0; 1168 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 1169 ia->ia6_lifetime.ia6t_preferred = 1170 time_uptime + ia->ia6_lifetime.ia6t_pltime; 1171 } else 1172 ia->ia6_lifetime.ia6t_preferred = 0; 1173 1174 /* 1175 * backward compatibility - if IN6_IFF_DEPRECATED is set from the 1176 * userland, make it deprecated. 1177 */ 1178 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) { 1179 ia->ia6_lifetime.ia6t_pltime = 0; 1180 ia->ia6_lifetime.ia6t_preferred = time_uptime; 1181 } 1182 1183 /* 1184 * configure address flags. 1185 */ 1186 ia->ia6_flags = ifra->ifra_flags; 1187 1188 /* 1189 * Make the address tentative before joining multicast addresses, 1190 * so that corresponding MLD responses would not have a tentative 1191 * source address. 1192 */ 1193 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */ 1194 1195 /* 1196 * DAD should be performed for an new address or addresses on 1197 * an interface with ND6_IFF_IFDISABLED. 1198 */ 1199 if (in6if_do_dad(ifp) && 1200 (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED))) 1201 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1202 1203 /* notify other subsystems */ 1204 error = in6_notify_ifa(ifp, ia, ifra, hostIsNew); 1205 1206 return (error); 1207 } 1208 1209 /* 1210 * Do link-level ifa job: 1211 * 1) Add lle entry for added address 1212 * 2) Notifies routing socket users about new address 1213 * 3) join appropriate multicast group 1214 * 4) start DAD if enabled 1215 */ 1216 static int 1217 in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, 1218 struct in6_ifaddr *ia, int flags) 1219 { 1220 struct in6_multi *in6m_sol; 1221 int error = 0; 1222 1223 /* Add local address to lltable, if necessary (ex. on p2p link). */ 1224 if ((error = nd6_add_ifa_lle(ia)) != 0) { 1225 in6_purgeaddr(&ia->ia_ifa); 1226 ifa_free(&ia->ia_ifa); 1227 return (error); 1228 } 1229 1230 /* Join necessary multicast groups. */ 1231 in6m_sol = NULL; 1232 if ((ifp->if_flags & IFF_MULTICAST) != 0) { 1233 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol); 1234 if (error != 0) { 1235 in6_purgeaddr(&ia->ia_ifa); 1236 ifa_free(&ia->ia_ifa); 1237 return (error); 1238 } 1239 } 1240 1241 /* Perform DAD, if the address is TENTATIVE. */ 1242 if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) { 1243 int delay, mindelay, maxdelay; 1244 1245 delay = 0; 1246 if ((flags & IN6_IFAUPDATE_DADDELAY)) { 1247 /* 1248 * We need to impose a delay before sending an NS 1249 * for DAD. Check if we also needed a delay for the 1250 * corresponding MLD message. If we did, the delay 1251 * should be larger than the MLD delay (this could be 1252 * relaxed a bit, but this simple logic is at least 1253 * safe). 1254 * XXX: Break data hiding guidelines and look at 1255 * state for the solicited multicast group. 1256 */ 1257 mindelay = 0; 1258 if (in6m_sol != NULL && 1259 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) { 1260 mindelay = in6m_sol->in6m_timer; 1261 } 1262 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz; 1263 if (maxdelay - mindelay == 0) 1264 delay = 0; 1265 else { 1266 delay = 1267 (arc4random() % (maxdelay - mindelay)) + 1268 mindelay; 1269 } 1270 } 1271 nd6_dad_start((struct ifaddr *)ia, delay); 1272 } 1273 1274 in6_newaddrmsg(ia, RTM_ADD); 1275 ifa_free(&ia->ia_ifa); 1276 return (error); 1277 } 1278 1279 void 1280 in6_purgeaddr(struct ifaddr *ifa) 1281 { 1282 struct ifnet *ifp = ifa->ifa_ifp; 1283 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa; 1284 struct in6_multi_mship *imm; 1285 int plen, error; 1286 1287 if (ifa->ifa_carp) 1288 (*carp_detach_p)(ifa, false); 1289 1290 /* 1291 * Remove the loopback route to the interface address. 1292 * The check for the current setting of "nd6_useloopback" 1293 * is not needed. 1294 */ 1295 if (ia->ia_flags & IFA_RTSELF) { 1296 error = ifa_del_loopback_route((struct ifaddr *)ia, 1297 (struct sockaddr *)&ia->ia_addr); 1298 if (error == 0) 1299 ia->ia_flags &= ~IFA_RTSELF; 1300 } 1301 1302 /* stop DAD processing */ 1303 nd6_dad_stop(ifa); 1304 1305 /* Leave multicast groups. */ 1306 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 1307 LIST_REMOVE(imm, i6mm_chain); 1308 if (imm->i6mm_maddr != NULL) 1309 in6_leavegroup(imm->i6mm_maddr, NULL); 1310 free(imm, M_IP6MADDR); 1311 } 1312 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1313 if ((ia->ia_flags & IFA_ROUTE) && plen == 128) { 1314 error = rtinit(&(ia->ia_ifa), RTM_DELETE, ia->ia_flags | 1315 (ia->ia_dstaddr.sin6_family == AF_INET6 ? RTF_HOST : 0)); 1316 if (error != 0) 1317 log(LOG_INFO, "%s: err=%d, destination address delete " 1318 "failed\n", __func__, error); 1319 ia->ia_flags &= ~IFA_ROUTE; 1320 } 1321 1322 in6_newaddrmsg(ia, RTM_DELETE); 1323 in6_unlink_ifa(ia, ifp); 1324 } 1325 1326 static void 1327 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp) 1328 { 1329 char ip6buf[INET6_ADDRSTRLEN]; 1330 int remove_lle; 1331 1332 IF_ADDR_WLOCK(ifp); 1333 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link); 1334 IF_ADDR_WUNLOCK(ifp); 1335 ifa_free(&ia->ia_ifa); /* if_addrhead */ 1336 1337 /* 1338 * Defer the release of what might be the last reference to the 1339 * in6_ifaddr so that it can't be freed before the remainder of the 1340 * cleanup. 1341 */ 1342 IN6_IFADDR_WLOCK(); 1343 CK_STAILQ_REMOVE(&V_in6_ifaddrhead, ia, in6_ifaddr, ia_link); 1344 CK_LIST_REMOVE(ia, ia6_hash); 1345 IN6_IFADDR_WUNLOCK(); 1346 1347 /* 1348 * Release the reference to the base prefix. There should be a 1349 * positive reference. 1350 */ 1351 remove_lle = 0; 1352 if (ia->ia6_ndpr == NULL) { 1353 nd6log((LOG_NOTICE, 1354 "in6_unlink_ifa: autoconf'ed address " 1355 "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia)))); 1356 } else { 1357 ia->ia6_ndpr->ndpr_addrcnt--; 1358 /* Do not delete lles within prefix if refcont != 0 */ 1359 if (ia->ia6_ndpr->ndpr_addrcnt == 0) 1360 remove_lle = 1; 1361 ia->ia6_ndpr = NULL; 1362 } 1363 1364 nd6_rem_ifa_lle(ia, remove_lle); 1365 1366 /* 1367 * Also, if the address being removed is autoconf'ed, call 1368 * pfxlist_onlink_check() since the release might affect the status of 1369 * other (detached) addresses. 1370 */ 1371 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) { 1372 pfxlist_onlink_check(); 1373 } 1374 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */ 1375 } 1376 1377 /* 1378 * Notifies other subsystems about address change/arrival: 1379 * 1) Notifies device handler on the first IPv6 address assignment 1380 * 2) Handle routing table changes for P2P links and route 1381 * 3) Handle routing table changes for address host route 1382 */ 1383 static int 1384 in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia, 1385 struct in6_aliasreq *ifra, int hostIsNew) 1386 { 1387 int error = 0, plen, ifacount = 0; 1388 struct ifaddr *ifa; 1389 struct sockaddr_in6 *pdst; 1390 char ip6buf[INET6_ADDRSTRLEN]; 1391 1392 /* 1393 * Give the interface a chance to initialize 1394 * if this is its first address, 1395 */ 1396 if (hostIsNew != 0) { 1397 struct epoch_tracker et; 1398 1399 NET_EPOCH_ENTER(et); 1400 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1401 if (ifa->ifa_addr->sa_family != AF_INET6) 1402 continue; 1403 ifacount++; 1404 } 1405 NET_EPOCH_EXIT(et); 1406 } 1407 1408 if (ifacount <= 1 && ifp->if_ioctl) { 1409 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 1410 if (error) 1411 goto done; 1412 } 1413 1414 /* 1415 * If a new destination address is specified, scrub the old one and 1416 * install the new destination. Note that the interface must be 1417 * p2p or loopback. 1418 */ 1419 pdst = &ifra->ifra_dstaddr; 1420 if (pdst->sin6_family == AF_INET6 && 1421 !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) { 1422 if ((ia->ia_flags & IFA_ROUTE) != 0 && 1423 (rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST) != 0)) { 1424 nd6log((LOG_ERR, "in6_update_ifa_internal: failed to " 1425 "remove a route to the old destination: %s\n", 1426 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1427 /* proceed anyway... */ 1428 } else 1429 ia->ia_flags &= ~IFA_ROUTE; 1430 ia->ia_dstaddr = *pdst; 1431 } 1432 1433 /* 1434 * If a new destination address is specified for a point-to-point 1435 * interface, install a route to the destination as an interface 1436 * direct route. 1437 * XXX: the logic below rejects assigning multiple addresses on a p2p 1438 * interface that share the same destination. 1439 */ 1440 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */ 1441 if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 && 1442 ia->ia_dstaddr.sin6_family == AF_INET6) { 1443 int rtflags = RTF_UP | RTF_HOST; 1444 /* 1445 * Handle the case for ::1 . 1446 */ 1447 if (ifp->if_flags & IFF_LOOPBACK) 1448 ia->ia_flags |= IFA_RTSELF; 1449 error = rtinit(&ia->ia_ifa, RTM_ADD, ia->ia_flags | rtflags); 1450 if (error) 1451 goto done; 1452 ia->ia_flags |= IFA_ROUTE; 1453 } 1454 1455 /* 1456 * add a loopback route to self if not exists 1457 */ 1458 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) { 1459 error = ifa_add_loopback_route((struct ifaddr *)ia, 1460 (struct sockaddr *)&ia->ia_addr); 1461 if (error == 0) 1462 ia->ia_flags |= IFA_RTSELF; 1463 } 1464 done: 1465 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL, 1466 "Invoking IPv6 network device address event may sleep"); 1467 1468 ifa_ref(&ia->ia_ifa); 1469 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa, 1470 IFADDR_EVENT_ADD); 1471 ifa_free(&ia->ia_ifa); 1472 1473 return (error); 1474 } 1475 1476 /* 1477 * Find an IPv6 interface link-local address specific to an interface. 1478 * ifaddr is returned referenced. 1479 */ 1480 struct in6_ifaddr * 1481 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags) 1482 { 1483 struct ifaddr *ifa; 1484 1485 NET_EPOCH_ASSERT(); 1486 1487 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1488 if (ifa->ifa_addr->sa_family != AF_INET6) 1489 continue; 1490 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) { 1491 if ((((struct in6_ifaddr *)ifa)->ia6_flags & 1492 ignoreflags) != 0) 1493 continue; 1494 ifa_ref(ifa); 1495 break; 1496 } 1497 } 1498 1499 return ((struct in6_ifaddr *)ifa); 1500 } 1501 1502 1503 /* 1504 * find the interface address corresponding to a given IPv6 address. 1505 * ifaddr is returned referenced. 1506 */ 1507 struct in6_ifaddr * 1508 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid) 1509 { 1510 struct rm_priotracker in6_ifa_tracker; 1511 struct in6_ifaddr *ia; 1512 1513 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1514 CK_LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) { 1515 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) { 1516 if (zoneid != 0 && 1517 zoneid != ia->ia_addr.sin6_scope_id) 1518 continue; 1519 ifa_ref(&ia->ia_ifa); 1520 break; 1521 } 1522 } 1523 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1524 return (ia); 1525 } 1526 1527 /* 1528 * find the internet address corresponding to a given interface and address. 1529 * ifaddr is returned referenced. 1530 */ 1531 struct in6_ifaddr * 1532 in6ifa_ifpwithaddr(struct ifnet *ifp, const struct in6_addr *addr) 1533 { 1534 struct epoch_tracker et; 1535 struct ifaddr *ifa; 1536 1537 NET_EPOCH_ENTER(et); 1538 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1539 if (ifa->ifa_addr->sa_family != AF_INET6) 1540 continue; 1541 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) { 1542 ifa_ref(ifa); 1543 break; 1544 } 1545 } 1546 NET_EPOCH_EXIT(et); 1547 1548 return ((struct in6_ifaddr *)ifa); 1549 } 1550 1551 /* 1552 * Find a link-local scoped address on ifp and return it if any. 1553 */ 1554 struct in6_ifaddr * 1555 in6ifa_llaonifp(struct ifnet *ifp) 1556 { 1557 struct epoch_tracker et; 1558 struct sockaddr_in6 *sin6; 1559 struct ifaddr *ifa; 1560 1561 1562 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) 1563 return (NULL); 1564 NET_EPOCH_ENTER(et); 1565 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1566 if (ifa->ifa_addr->sa_family != AF_INET6) 1567 continue; 1568 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 1569 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) || 1570 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) || 1571 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr)) 1572 break; 1573 } 1574 NET_EPOCH_EXIT(et); 1575 1576 return ((struct in6_ifaddr *)ifa); 1577 } 1578 1579 /* 1580 * Convert IP6 address to printable (loggable) representation. Caller 1581 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long. 1582 */ 1583 static char digits[] = "0123456789abcdef"; 1584 char * 1585 ip6_sprintf(char *ip6buf, const struct in6_addr *addr) 1586 { 1587 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0; 1588 char *cp; 1589 const u_int16_t *a = (const u_int16_t *)addr; 1590 const u_int8_t *d; 1591 int dcolon = 0, zero = 0; 1592 1593 cp = ip6buf; 1594 1595 for (i = 0; i < 8; i++) { 1596 if (*(a + i) == 0) { 1597 cnt++; 1598 if (cnt == 1) 1599 idx = i; 1600 } 1601 else if (maxcnt < cnt) { 1602 maxcnt = cnt; 1603 index = idx; 1604 cnt = 0; 1605 } 1606 } 1607 if (maxcnt < cnt) { 1608 maxcnt = cnt; 1609 index = idx; 1610 } 1611 1612 for (i = 0; i < 8; i++) { 1613 if (dcolon == 1) { 1614 if (*a == 0) { 1615 if (i == 7) 1616 *cp++ = ':'; 1617 a++; 1618 continue; 1619 } else 1620 dcolon = 2; 1621 } 1622 if (*a == 0) { 1623 if (dcolon == 0 && *(a + 1) == 0 && i == index) { 1624 if (i == 0) 1625 *cp++ = ':'; 1626 *cp++ = ':'; 1627 dcolon = 1; 1628 } else { 1629 *cp++ = '0'; 1630 *cp++ = ':'; 1631 } 1632 a++; 1633 continue; 1634 } 1635 d = (const u_char *)a; 1636 /* Try to eliminate leading zeros in printout like in :0001. */ 1637 zero = 1; 1638 *cp = digits[*d >> 4]; 1639 if (*cp != '0') { 1640 zero = 0; 1641 cp++; 1642 } 1643 *cp = digits[*d++ & 0xf]; 1644 if (zero == 0 || (*cp != '0')) { 1645 zero = 0; 1646 cp++; 1647 } 1648 *cp = digits[*d >> 4]; 1649 if (zero == 0 || (*cp != '0')) { 1650 zero = 0; 1651 cp++; 1652 } 1653 *cp++ = digits[*d & 0xf]; 1654 *cp++ = ':'; 1655 a++; 1656 } 1657 *--cp = '\0'; 1658 return (ip6buf); 1659 } 1660 1661 int 1662 in6_localaddr(struct in6_addr *in6) 1663 { 1664 struct rm_priotracker in6_ifa_tracker; 1665 struct in6_ifaddr *ia; 1666 1667 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6)) 1668 return 1; 1669 1670 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1671 CK_STAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 1672 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr, 1673 &ia->ia_prefixmask.sin6_addr)) { 1674 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1675 return 1; 1676 } 1677 } 1678 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1679 1680 return (0); 1681 } 1682 1683 /* 1684 * Return 1 if an internet address is for the local host and configured 1685 * on one of its interfaces. 1686 */ 1687 int 1688 in6_localip(struct in6_addr *in6) 1689 { 1690 struct rm_priotracker in6_ifa_tracker; 1691 struct in6_ifaddr *ia; 1692 1693 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1694 CK_LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) { 1695 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) { 1696 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1697 return (1); 1698 } 1699 } 1700 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1701 return (0); 1702 } 1703 1704 /* 1705 * Return 1 if an internet address is configured on an interface. 1706 */ 1707 int 1708 in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr) 1709 { 1710 struct in6_addr in6; 1711 struct ifaddr *ifa; 1712 struct in6_ifaddr *ia6; 1713 1714 NET_EPOCH_ASSERT(); 1715 1716 in6 = *addr; 1717 if (in6_clearscope(&in6)) 1718 return (0); 1719 in6_setscope(&in6, ifp, NULL); 1720 1721 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1722 if (ifa->ifa_addr->sa_family != AF_INET6) 1723 continue; 1724 ia6 = (struct in6_ifaddr *)ifa; 1725 if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) 1726 return (1); 1727 } 1728 1729 return (0); 1730 } 1731 1732 int 1733 in6_is_addr_deprecated(struct sockaddr_in6 *sa6) 1734 { 1735 struct rm_priotracker in6_ifa_tracker; 1736 struct in6_ifaddr *ia; 1737 1738 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1739 CK_LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) { 1740 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) { 1741 if (ia->ia6_flags & IN6_IFF_DEPRECATED) { 1742 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1743 return (1); /* true */ 1744 } 1745 break; 1746 } 1747 } 1748 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 1749 1750 return (0); /* false */ 1751 } 1752 1753 /* 1754 * return length of part which dst and src are equal 1755 * hard coding... 1756 */ 1757 int 1758 in6_matchlen(struct in6_addr *src, struct in6_addr *dst) 1759 { 1760 int match = 0; 1761 u_char *s = (u_char *)src, *d = (u_char *)dst; 1762 u_char *lim = s + 16, r; 1763 1764 while (s < lim) 1765 if ((r = (*d++ ^ *s++)) != 0) { 1766 while (r < 128) { 1767 match++; 1768 r <<= 1; 1769 } 1770 break; 1771 } else 1772 match += 8; 1773 return match; 1774 } 1775 1776 /* XXX: to be scope conscious */ 1777 int 1778 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len) 1779 { 1780 int bytelen, bitlen; 1781 1782 /* sanity check */ 1783 if (0 > len || len > 128) { 1784 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n", 1785 len); 1786 return (0); 1787 } 1788 1789 bytelen = len / 8; 1790 bitlen = len % 8; 1791 1792 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen)) 1793 return (0); 1794 if (bitlen != 0 && 1795 p1->s6_addr[bytelen] >> (8 - bitlen) != 1796 p2->s6_addr[bytelen] >> (8 - bitlen)) 1797 return (0); 1798 1799 return (1); 1800 } 1801 1802 void 1803 in6_prefixlen2mask(struct in6_addr *maskp, int len) 1804 { 1805 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; 1806 int bytelen, bitlen, i; 1807 1808 /* sanity check */ 1809 if (0 > len || len > 128) { 1810 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n", 1811 len); 1812 return; 1813 } 1814 1815 bzero(maskp, sizeof(*maskp)); 1816 bytelen = len / 8; 1817 bitlen = len % 8; 1818 for (i = 0; i < bytelen; i++) 1819 maskp->s6_addr[i] = 0xff; 1820 if (bitlen) 1821 maskp->s6_addr[bytelen] = maskarray[bitlen - 1]; 1822 } 1823 1824 /* 1825 * return the best address out of the same scope. if no address was 1826 * found, return the first valid address from designated IF. 1827 */ 1828 struct in6_ifaddr * 1829 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst) 1830 { 1831 int dst_scope = in6_addrscope(dst), blen = -1, tlen; 1832 struct ifaddr *ifa; 1833 struct in6_ifaddr *besta = NULL; 1834 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */ 1835 1836 NET_EPOCH_ASSERT(); 1837 1838 dep[0] = dep[1] = NULL; 1839 1840 /* 1841 * We first look for addresses in the same scope. 1842 * If there is one, return it. 1843 * If two or more, return one which matches the dst longest. 1844 * If none, return one of global addresses assigned other ifs. 1845 */ 1846 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1847 if (ifa->ifa_addr->sa_family != AF_INET6) 1848 continue; 1849 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1850 continue; /* XXX: is there any case to allow anycast? */ 1851 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1852 continue; /* don't use this interface */ 1853 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1854 continue; 1855 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1856 if (V_ip6_use_deprecated) 1857 dep[0] = (struct in6_ifaddr *)ifa; 1858 continue; 1859 } 1860 1861 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) { 1862 /* 1863 * call in6_matchlen() as few as possible 1864 */ 1865 if (besta) { 1866 if (blen == -1) 1867 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst); 1868 tlen = in6_matchlen(IFA_IN6(ifa), dst); 1869 if (tlen > blen) { 1870 blen = tlen; 1871 besta = (struct in6_ifaddr *)ifa; 1872 } 1873 } else 1874 besta = (struct in6_ifaddr *)ifa; 1875 } 1876 } 1877 if (besta) { 1878 ifa_ref(&besta->ia_ifa); 1879 return (besta); 1880 } 1881 1882 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1883 if (ifa->ifa_addr->sa_family != AF_INET6) 1884 continue; 1885 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST) 1886 continue; /* XXX: is there any case to allow anycast? */ 1887 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) 1888 continue; /* don't use this interface */ 1889 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED) 1890 continue; 1891 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) { 1892 if (V_ip6_use_deprecated) 1893 dep[1] = (struct in6_ifaddr *)ifa; 1894 continue; 1895 } 1896 1897 if (ifa != NULL) 1898 ifa_ref(ifa); 1899 return (struct in6_ifaddr *)ifa; 1900 } 1901 1902 /* use the last-resort values, that are, deprecated addresses */ 1903 if (dep[0]) { 1904 ifa_ref((struct ifaddr *)dep[0]); 1905 return dep[0]; 1906 } 1907 if (dep[1]) { 1908 ifa_ref((struct ifaddr *)dep[1]); 1909 return dep[1]; 1910 } 1911 1912 return NULL; 1913 } 1914 1915 /* 1916 * perform DAD when interface becomes IFF_UP. 1917 */ 1918 void 1919 in6_if_up(struct ifnet *ifp) 1920 { 1921 struct epoch_tracker et; 1922 struct ifaddr *ifa; 1923 struct in6_ifaddr *ia; 1924 1925 NET_EPOCH_ENTER(et); 1926 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1927 if (ifa->ifa_addr->sa_family != AF_INET6) 1928 continue; 1929 ia = (struct in6_ifaddr *)ifa; 1930 if (ia->ia6_flags & IN6_IFF_TENTATIVE) { 1931 /* 1932 * The TENTATIVE flag was likely set by hand 1933 * beforehand, implicitly indicating the need for DAD. 1934 * We may be able to skip the random delay in this 1935 * case, but we impose delays just in case. 1936 */ 1937 nd6_dad_start(ifa, 1938 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz)); 1939 } 1940 } 1941 NET_EPOCH_EXIT(et); 1942 1943 /* 1944 * special cases, like 6to4, are handled in in6_ifattach 1945 */ 1946 in6_ifattach(ifp, NULL); 1947 } 1948 1949 int 1950 in6if_do_dad(struct ifnet *ifp) 1951 { 1952 1953 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 1954 return (0); 1955 if ((ifp->if_flags & IFF_MULTICAST) == 0) 1956 return (0); 1957 if ((ND_IFINFO(ifp)->flags & 1958 (ND6_IFF_IFDISABLED | ND6_IFF_NO_DAD)) != 0) 1959 return (0); 1960 return (1); 1961 } 1962 1963 /* 1964 * Calculate max IPv6 MTU through all the interfaces and store it 1965 * to in6_maxmtu. 1966 */ 1967 void 1968 in6_setmaxmtu(void) 1969 { 1970 struct epoch_tracker et; 1971 unsigned long maxmtu = 0; 1972 struct ifnet *ifp; 1973 1974 NET_EPOCH_ENTER(et); 1975 CK_STAILQ_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 NET_EPOCH_EXIT(et); 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 struct in6_llentry { 2034 struct llentry base; 2035 }; 2036 2037 #define IN6_LLTBL_DEFAULT_HSIZE 32 2038 #define IN6_LLTBL_HASH(k, h) \ 2039 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 2040 2041 /* 2042 * Do actual deallocation of @lle. 2043 */ 2044 static void 2045 in6_lltable_destroy_lle_unlocked(epoch_context_t ctx) 2046 { 2047 struct llentry *lle; 2048 2049 lle = __containerof(ctx, struct llentry, lle_epoch_ctx); 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 NET_EPOCH_CALL(in6_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx); 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 llentry_free(lle); 2136 } 2137 2138 static int 2139 in6_lltable_rtcheck(struct ifnet *ifp, 2140 u_int flags, 2141 const struct sockaddr *l3addr) 2142 { 2143 const struct sockaddr_in6 *sin6; 2144 struct nhop6_basic nh6; 2145 struct in6_addr dst; 2146 uint32_t scopeid; 2147 int error; 2148 char ip6buf[INET6_ADDRSTRLEN]; 2149 int fibnum; 2150 2151 NET_EPOCH_ASSERT(); 2152 KASSERT(l3addr->sa_family == AF_INET6, 2153 ("sin_family %d", l3addr->sa_family)); 2154 2155 sin6 = (const struct sockaddr_in6 *)l3addr; 2156 in6_splitscope(&sin6->sin6_addr, &dst, &scopeid); 2157 fibnum = V_rt_add_addr_allfibs ? RT_DEFAULT_FIB : ifp->if_fib; 2158 error = fib6_lookup_nh_basic(fibnum, &dst, scopeid, 0, 0, &nh6); 2159 if (error != 0 || (nh6.nh_flags & NHF_GATEWAY) || nh6.nh_ifp != ifp) { 2160 struct ifaddr *ifa; 2161 /* 2162 * Create an ND6 cache for an IPv6 neighbor 2163 * that is not covered by our own prefix. 2164 */ 2165 ifa = ifaof_ifpforaddr(l3addr, ifp); 2166 if (ifa != NULL) { 2167 return 0; 2168 } 2169 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n", 2170 ip6_sprintf(ip6buf, &sin6->sin6_addr)); 2171 return EINVAL; 2172 } 2173 return 0; 2174 } 2175 2176 /* 2177 * Called by the datapath to indicate that the entry was used. 2178 */ 2179 static void 2180 in6_lltable_mark_used(struct llentry *lle) 2181 { 2182 2183 LLE_REQ_LOCK(lle); 2184 lle->r_skip_req = 0; 2185 2186 /* 2187 * Set the hit time so the callback function 2188 * can determine the remaining time before 2189 * transiting to the DELAY state. 2190 */ 2191 lle->lle_hittime = time_uptime; 2192 LLE_REQ_UNLOCK(lle); 2193 } 2194 2195 static inline uint32_t 2196 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize) 2197 { 2198 2199 return (IN6_LLTBL_HASH(dst->s6_addr32[3], hsize)); 2200 } 2201 2202 static uint32_t 2203 in6_lltable_hash(const struct llentry *lle, uint32_t hsize) 2204 { 2205 2206 return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize)); 2207 } 2208 2209 static void 2210 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 2211 { 2212 struct sockaddr_in6 *sin6; 2213 2214 sin6 = (struct sockaddr_in6 *)sa; 2215 bzero(sin6, sizeof(*sin6)); 2216 sin6->sin6_family = AF_INET6; 2217 sin6->sin6_len = sizeof(*sin6); 2218 sin6->sin6_addr = lle->r_l3addr.addr6; 2219 } 2220 2221 static inline struct llentry * 2222 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst) 2223 { 2224 struct llentry *lle; 2225 struct llentries *lleh; 2226 u_int hashidx; 2227 2228 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize); 2229 lleh = &llt->lle_head[hashidx]; 2230 CK_LIST_FOREACH(lle, lleh, lle_next) { 2231 if (lle->la_flags & LLE_DELETED) 2232 continue; 2233 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst)) 2234 break; 2235 } 2236 2237 return (lle); 2238 } 2239 2240 static void 2241 in6_lltable_delete_entry(struct lltable *llt, struct llentry *lle) 2242 { 2243 2244 lle->la_flags |= LLE_DELETED; 2245 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 2246 #ifdef DIAGNOSTIC 2247 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 2248 #endif 2249 llentry_free(lle); 2250 } 2251 2252 static struct llentry * 2253 in6_lltable_alloc(struct lltable *llt, u_int flags, 2254 const struct sockaddr *l3addr) 2255 { 2256 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2257 struct ifnet *ifp = llt->llt_ifp; 2258 struct llentry *lle; 2259 char linkhdr[LLE_MAX_LINKHDR]; 2260 size_t linkhdrsize; 2261 int lladdr_off; 2262 2263 KASSERT(l3addr->sa_family == AF_INET6, 2264 ("sin_family %d", l3addr->sa_family)); 2265 2266 /* 2267 * A route that covers the given address must have 2268 * been installed 1st because we are doing a resolution, 2269 * verify this. 2270 */ 2271 if (!(flags & LLE_IFADDR) && 2272 in6_lltable_rtcheck(ifp, flags, l3addr) != 0) 2273 return (NULL); 2274 2275 lle = in6_lltable_new(&sin6->sin6_addr, flags); 2276 if (lle == NULL) { 2277 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 2278 return (NULL); 2279 } 2280 lle->la_flags = flags; 2281 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 2282 linkhdrsize = LLE_MAX_LINKHDR; 2283 if (lltable_calc_llheader(ifp, AF_INET6, IF_LLADDR(ifp), 2284 linkhdr, &linkhdrsize, &lladdr_off) != 0) { 2285 NET_EPOCH_CALL(in6_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx); 2286 return (NULL); 2287 } 2288 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize, 2289 lladdr_off); 2290 lle->la_flags |= LLE_STATIC; 2291 } 2292 2293 if ((lle->la_flags & LLE_STATIC) != 0) 2294 lle->ln_state = ND6_LLINFO_REACHABLE; 2295 2296 return (lle); 2297 } 2298 2299 static struct llentry * 2300 in6_lltable_lookup(struct lltable *llt, u_int flags, 2301 const struct sockaddr *l3addr) 2302 { 2303 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr; 2304 struct llentry *lle; 2305 2306 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 2307 KASSERT(l3addr->sa_family == AF_INET6, 2308 ("sin_family %d", l3addr->sa_family)); 2309 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) != 2310 (LLE_UNLOCKED | LLE_EXCLUSIVE), 2311 ("wrong lle request flags: %#x", flags)); 2312 2313 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr); 2314 if (lle == NULL) 2315 return (NULL); 2316 if (flags & LLE_UNLOCKED) 2317 return (lle); 2318 2319 if (flags & LLE_EXCLUSIVE) 2320 LLE_WLOCK(lle); 2321 else 2322 LLE_RLOCK(lle); 2323 2324 /* 2325 * If the afdata lock is not held, the LLE may have been unlinked while 2326 * we were blocked on the LLE lock. Check for this case. 2327 */ 2328 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) { 2329 if (flags & LLE_EXCLUSIVE) 2330 LLE_WUNLOCK(lle); 2331 else 2332 LLE_RUNLOCK(lle); 2333 return (NULL); 2334 } 2335 return (lle); 2336 } 2337 2338 static int 2339 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 2340 struct sysctl_req *wr) 2341 { 2342 struct ifnet *ifp = llt->llt_ifp; 2343 /* XXX stack use */ 2344 struct { 2345 struct rt_msghdr rtm; 2346 struct sockaddr_in6 sin6; 2347 /* 2348 * ndp.c assumes that sdl is word aligned 2349 */ 2350 #ifdef __LP64__ 2351 uint32_t pad; 2352 #endif 2353 struct sockaddr_dl sdl; 2354 } ndpc; 2355 struct sockaddr_dl *sdl; 2356 int error; 2357 2358 bzero(&ndpc, sizeof(ndpc)); 2359 /* skip deleted entries */ 2360 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 2361 return (0); 2362 /* Skip if jailed and not a valid IP of the prison. */ 2363 lltable_fill_sa_entry(lle, (struct sockaddr *)&ndpc.sin6); 2364 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&ndpc.sin6) != 0) 2365 return (0); 2366 /* 2367 * produce a msg made of: 2368 * struct rt_msghdr; 2369 * struct sockaddr_in6 (IPv6) 2370 * struct sockaddr_dl; 2371 */ 2372 ndpc.rtm.rtm_msglen = sizeof(ndpc); 2373 ndpc.rtm.rtm_version = RTM_VERSION; 2374 ndpc.rtm.rtm_type = RTM_GET; 2375 ndpc.rtm.rtm_flags = RTF_UP; 2376 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 2377 if (V_deembed_scopeid) 2378 sa6_recoverscope(&ndpc.sin6); 2379 2380 /* publish */ 2381 if (lle->la_flags & LLE_PUB) 2382 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE; 2383 2384 sdl = &ndpc.sdl; 2385 sdl->sdl_family = AF_LINK; 2386 sdl->sdl_len = sizeof(*sdl); 2387 sdl->sdl_index = ifp->if_index; 2388 sdl->sdl_type = ifp->if_type; 2389 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 2390 sdl->sdl_alen = ifp->if_addrlen; 2391 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 2392 } else { 2393 sdl->sdl_alen = 0; 2394 bzero(LLADDR(sdl), ifp->if_addrlen); 2395 } 2396 if (lle->la_expire != 0) 2397 ndpc.rtm.rtm_rmx.rmx_expire = lle->la_expire + 2398 lle->lle_remtime / hz + time_second - time_uptime; 2399 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 2400 if (lle->la_flags & LLE_STATIC) 2401 ndpc.rtm.rtm_flags |= RTF_STATIC; 2402 if (lle->la_flags & LLE_IFADDR) 2403 ndpc.rtm.rtm_flags |= RTF_PINNED; 2404 if (lle->ln_router != 0) 2405 ndpc.rtm.rtm_flags |= RTF_GATEWAY; 2406 ndpc.rtm.rtm_rmx.rmx_pksent = lle->la_asked; 2407 /* Store state in rmx_weight value */ 2408 ndpc.rtm.rtm_rmx.rmx_state = lle->ln_state; 2409 ndpc.rtm.rtm_index = ifp->if_index; 2410 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc)); 2411 2412 return (error); 2413 } 2414 2415 static struct lltable * 2416 in6_lltattach(struct ifnet *ifp) 2417 { 2418 struct lltable *llt; 2419 2420 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE); 2421 llt->llt_af = AF_INET6; 2422 llt->llt_ifp = ifp; 2423 2424 llt->llt_lookup = in6_lltable_lookup; 2425 llt->llt_alloc_entry = in6_lltable_alloc; 2426 llt->llt_delete_entry = in6_lltable_delete_entry; 2427 llt->llt_dump_entry = in6_lltable_dump_entry; 2428 llt->llt_hash = in6_lltable_hash; 2429 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry; 2430 llt->llt_free_entry = in6_lltable_free_entry; 2431 llt->llt_match_prefix = in6_lltable_match_prefix; 2432 llt->llt_mark_used = in6_lltable_mark_used; 2433 lltable_link(llt); 2434 2435 return (llt); 2436 } 2437 2438 void * 2439 in6_domifattach(struct ifnet *ifp) 2440 { 2441 struct in6_ifextra *ext; 2442 2443 /* There are not IPv6-capable interfaces. */ 2444 switch (ifp->if_type) { 2445 case IFT_PFLOG: 2446 case IFT_PFSYNC: 2447 case IFT_USB: 2448 return (NULL); 2449 } 2450 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK); 2451 bzero(ext, sizeof(*ext)); 2452 2453 ext->in6_ifstat = malloc(sizeof(counter_u64_t) * 2454 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK); 2455 COUNTER_ARRAY_ALLOC(ext->in6_ifstat, 2456 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK); 2457 2458 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) * 2459 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR, 2460 M_WAITOK); 2461 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat, 2462 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK); 2463 2464 ext->nd_ifinfo = nd6_ifattach(ifp); 2465 ext->scope6_id = scope6_ifattach(ifp); 2466 ext->lltable = in6_lltattach(ifp); 2467 2468 ext->mld_ifinfo = mld_domifattach(ifp); 2469 2470 return ext; 2471 } 2472 2473 int 2474 in6_domifmtu(struct ifnet *ifp) 2475 { 2476 if (ifp->if_afdata[AF_INET6] == NULL) 2477 return ifp->if_mtu; 2478 2479 return (IN6_LINKMTU(ifp)); 2480 } 2481 2482 void 2483 in6_domifdetach(struct ifnet *ifp, void *aux) 2484 { 2485 struct in6_ifextra *ext = (struct in6_ifextra *)aux; 2486 2487 mld_domifdetach(ifp); 2488 scope6_ifdetach(ext->scope6_id); 2489 nd6_ifdetach(ifp, ext->nd_ifinfo); 2490 lltable_free(ext->lltable); 2491 COUNTER_ARRAY_FREE(ext->in6_ifstat, 2492 sizeof(struct in6_ifstat) / sizeof(uint64_t)); 2493 free(ext->in6_ifstat, M_IFADDR); 2494 COUNTER_ARRAY_FREE(ext->icmp6_ifstat, 2495 sizeof(struct icmp6_ifstat) / sizeof(uint64_t)); 2496 free(ext->icmp6_ifstat, M_IFADDR); 2497 free(ext, M_IFADDR); 2498 } 2499 2500 /* 2501 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be 2502 * v4 mapped addr or v4 compat addr 2503 */ 2504 void 2505 in6_sin6_2_sin(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2506 { 2507 2508 bzero(sin, sizeof(*sin)); 2509 sin->sin_len = sizeof(struct sockaddr_in); 2510 sin->sin_family = AF_INET; 2511 sin->sin_port = sin6->sin6_port; 2512 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3]; 2513 } 2514 2515 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */ 2516 void 2517 in6_sin_2_v4mapsin6(struct sockaddr_in *sin, struct sockaddr_in6 *sin6) 2518 { 2519 bzero(sin6, sizeof(*sin6)); 2520 sin6->sin6_len = sizeof(struct sockaddr_in6); 2521 sin6->sin6_family = AF_INET6; 2522 sin6->sin6_port = sin->sin_port; 2523 sin6->sin6_addr.s6_addr32[0] = 0; 2524 sin6->sin6_addr.s6_addr32[1] = 0; 2525 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 2526 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr; 2527 } 2528 2529 /* Convert sockaddr_in6 into sockaddr_in. */ 2530 void 2531 in6_sin6_2_sin_in_sock(struct sockaddr *nam) 2532 { 2533 struct sockaddr_in *sin_p; 2534 struct sockaddr_in6 sin6; 2535 2536 /* 2537 * Save original sockaddr_in6 addr and convert it 2538 * to sockaddr_in. 2539 */ 2540 sin6 = *(struct sockaddr_in6 *)nam; 2541 sin_p = (struct sockaddr_in *)nam; 2542 in6_sin6_2_sin(sin_p, &sin6); 2543 } 2544 2545 /* Convert sockaddr_in into sockaddr_in6 in v4 mapped addr format. */ 2546 void 2547 in6_sin_2_v4mapsin6_in_sock(struct sockaddr **nam) 2548 { 2549 struct sockaddr_in *sin_p; 2550 struct sockaddr_in6 *sin6_p; 2551 2552 sin6_p = malloc(sizeof *sin6_p, M_SONAME, M_WAITOK); 2553 sin_p = (struct sockaddr_in *)*nam; 2554 in6_sin_2_v4mapsin6(sin_p, sin6_p); 2555 free(*nam, M_SONAME); 2556 *nam = (struct sockaddr *)sin6_p; 2557 } 2558