1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * Copyright (C) 2001 WIDE Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)in.c 8.4 (Berkeley) 1/9/95 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/param.h> 39 #include <sys/eventhandler.h> 40 #include <sys/systm.h> 41 #include <sys/sockio.h> 42 #include <sys/malloc.h> 43 #include <sys/priv.h> 44 #include <sys/socket.h> 45 #include <sys/jail.h> 46 #include <sys/kernel.h> 47 #include <sys/lock.h> 48 #include <sys/proc.h> 49 #include <sys/sysctl.h> 50 #include <sys/syslog.h> 51 #include <sys/sx.h> 52 53 #include <net/if.h> 54 #include <net/if_var.h> 55 #include <net/if_arp.h> 56 #include <net/if_dl.h> 57 #include <net/if_llatbl.h> 58 #include <net/if_types.h> 59 #include <net/route.h> 60 #include <net/route/nhop.h> 61 #include <net/route/route_ctl.h> 62 #include <net/vnet.h> 63 64 #include <netinet/if_ether.h> 65 #include <netinet/in.h> 66 #include <netinet/in_fib.h> 67 #include <netinet/in_var.h> 68 #include <netinet/in_pcb.h> 69 #include <netinet/ip_var.h> 70 #include <netinet/ip_carp.h> 71 #include <netinet/igmp_var.h> 72 #include <netinet/udp.h> 73 #include <netinet/udp_var.h> 74 75 static int in_aifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *); 76 static int in_difaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *); 77 static int in_gifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *); 78 79 static void in_socktrim(struct sockaddr_in *); 80 static void in_purgemaddrs(struct ifnet *); 81 82 static bool ia_need_loopback_route(const struct in_ifaddr *); 83 84 VNET_DEFINE_STATIC(int, nosameprefix); 85 #define V_nosameprefix VNET(nosameprefix) 86 SYSCTL_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_VNET | CTLFLAG_RW, 87 &VNET_NAME(nosameprefix), 0, 88 "Refuse to create same prefixes on different interfaces"); 89 90 VNET_DEFINE_STATIC(bool, broadcast_lowest); 91 #define V_broadcast_lowest VNET(broadcast_lowest) 92 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, broadcast_lowest, CTLFLAG_VNET | CTLFLAG_RW, 93 &VNET_NAME(broadcast_lowest), 0, 94 "Treat lowest address on a subnet (host 0) as broadcast"); 95 96 VNET_DECLARE(struct inpcbinfo, ripcbinfo); 97 #define V_ripcbinfo VNET(ripcbinfo) 98 99 static struct sx in_control_sx; 100 SX_SYSINIT(in_control_sx, &in_control_sx, "in_control"); 101 102 /* 103 * Return 1 if an internet address is for a ``local'' host 104 * (one to which we have a connection). 105 */ 106 int 107 in_localaddr(struct in_addr in) 108 { 109 u_long i = ntohl(in.s_addr); 110 struct in_ifaddr *ia; 111 112 NET_EPOCH_ASSERT(); 113 114 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 115 if ((i & ia->ia_subnetmask) == ia->ia_subnet) 116 return (1); 117 } 118 119 return (0); 120 } 121 122 /* 123 * Return 1 if an internet address is for the local host and configured 124 * on one of its interfaces. 125 */ 126 bool 127 in_localip(struct in_addr in) 128 { 129 struct in_ifaddr *ia; 130 131 NET_EPOCH_ASSERT(); 132 133 CK_LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) 134 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) 135 return (true); 136 137 return (false); 138 } 139 140 /* 141 * Like in_localip(), but FIB-aware. 142 */ 143 bool 144 in_localip_fib(struct in_addr in, uint16_t fib) 145 { 146 struct in_ifaddr *ia; 147 148 NET_EPOCH_ASSERT(); 149 150 CK_LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) 151 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr && 152 ia->ia_ifa.ifa_ifp->if_fib == fib) 153 return (true); 154 155 return (false); 156 } 157 158 /* 159 * Return 1 if an internet address is configured on an interface. 160 */ 161 int 162 in_ifhasaddr(struct ifnet *ifp, struct in_addr in) 163 { 164 struct ifaddr *ifa; 165 struct in_ifaddr *ia; 166 167 NET_EPOCH_ASSERT(); 168 169 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 170 if (ifa->ifa_addr->sa_family != AF_INET) 171 continue; 172 ia = (struct in_ifaddr *)ifa; 173 if (ia->ia_addr.sin_addr.s_addr == in.s_addr) 174 return (1); 175 } 176 177 return (0); 178 } 179 180 /* 181 * Return a reference to the interface address which is different to 182 * the supplied one but with same IP address value. 183 */ 184 static struct in_ifaddr * 185 in_localip_more(struct in_ifaddr *original_ia) 186 { 187 struct epoch_tracker et; 188 in_addr_t original_addr = IA_SIN(original_ia)->sin_addr.s_addr; 189 uint32_t original_fib = original_ia->ia_ifa.ifa_ifp->if_fib; 190 struct in_ifaddr *ia; 191 192 NET_EPOCH_ENTER(et); 193 CK_LIST_FOREACH(ia, INADDR_HASH(original_addr), ia_hash) { 194 in_addr_t addr = IA_SIN(ia)->sin_addr.s_addr; 195 uint32_t fib = ia->ia_ifa.ifa_ifp->if_fib; 196 if (!V_rt_add_addr_allfibs && (original_fib != fib)) 197 continue; 198 if ((original_ia != ia) && (original_addr == addr)) { 199 ifa_ref(&ia->ia_ifa); 200 NET_EPOCH_EXIT(et); 201 return (ia); 202 } 203 } 204 NET_EPOCH_EXIT(et); 205 206 return (NULL); 207 } 208 209 /* 210 * Tries to find first IPv4 address in the provided fib. 211 * Prefers non-loopback addresses and return loopback IFF 212 * @loopback_ok is set. 213 * 214 * Returns ifa or NULL. 215 */ 216 struct in_ifaddr * 217 in_findlocal(uint32_t fibnum, bool loopback_ok) 218 { 219 struct in_ifaddr *ia = NULL, *ia_lo = NULL; 220 221 NET_EPOCH_ASSERT(); 222 223 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 224 uint32_t ia_fib = ia->ia_ifa.ifa_ifp->if_fib; 225 if (!V_rt_add_addr_allfibs && (fibnum != ia_fib)) 226 continue; 227 228 if (!IN_LOOPBACK(ntohl(IA_SIN(ia)->sin_addr.s_addr))) 229 break; 230 if (loopback_ok) 231 ia_lo = ia; 232 } 233 234 if (ia == NULL) 235 ia = ia_lo; 236 237 return (ia); 238 } 239 240 /* 241 * Determine whether an IP address is in a reserved set of addresses 242 * that may not be forwarded, or whether datagrams to that destination 243 * may be forwarded. 244 */ 245 int 246 in_canforward(struct in_addr in) 247 { 248 u_long i = ntohl(in.s_addr); 249 250 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i) || 251 IN_ZERONET(i) || IN_LOOPBACK(i)) 252 return (0); 253 return (1); 254 } 255 256 /* 257 * Trim a mask in a sockaddr 258 */ 259 static void 260 in_socktrim(struct sockaddr_in *ap) 261 { 262 char *cplim = (char *) &ap->sin_addr; 263 char *cp = (char *) (&ap->sin_addr + 1); 264 265 ap->sin_len = 0; 266 while (--cp >= cplim) 267 if (*cp) { 268 (ap)->sin_len = cp - (char *) (ap) + 1; 269 break; 270 } 271 } 272 273 /* 274 * Generic internet control operations (ioctl's). 275 */ 276 int 277 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp, 278 struct thread *td) 279 { 280 struct ifreq *ifr = (struct ifreq *)data; 281 struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr; 282 struct epoch_tracker et; 283 struct ifaddr *ifa; 284 struct in_ifaddr *ia; 285 int error; 286 287 if (ifp == NULL) 288 return (EADDRNOTAVAIL); 289 290 /* 291 * Filter out 4 ioctls we implement directly. Forward the rest 292 * to specific functions and ifp->if_ioctl(). 293 */ 294 switch (cmd) { 295 case SIOCGIFADDR: 296 case SIOCGIFBRDADDR: 297 case SIOCGIFDSTADDR: 298 case SIOCGIFNETMASK: 299 break; 300 case SIOCGIFALIAS: 301 sx_xlock(&in_control_sx); 302 error = in_gifaddr_ioctl(cmd, data, ifp, td); 303 sx_xunlock(&in_control_sx); 304 return (error); 305 case SIOCDIFADDR: 306 sx_xlock(&in_control_sx); 307 error = in_difaddr_ioctl(cmd, data, ifp, td); 308 sx_xunlock(&in_control_sx); 309 return (error); 310 case OSIOCAIFADDR: /* 9.x compat */ 311 case SIOCAIFADDR: 312 sx_xlock(&in_control_sx); 313 error = in_aifaddr_ioctl(cmd, data, ifp, td); 314 sx_xunlock(&in_control_sx); 315 return (error); 316 case SIOCSIFADDR: 317 case SIOCSIFBRDADDR: 318 case SIOCSIFDSTADDR: 319 case SIOCSIFNETMASK: 320 /* We no longer support that old commands. */ 321 return (EINVAL); 322 default: 323 if (ifp->if_ioctl == NULL) 324 return (EOPNOTSUPP); 325 return ((*ifp->if_ioctl)(ifp, cmd, data)); 326 } 327 328 if (addr->sin_addr.s_addr != INADDR_ANY && 329 prison_check_ip4(td->td_ucred, &addr->sin_addr) != 0) 330 return (EADDRNOTAVAIL); 331 332 /* 333 * Find address for this interface, if it exists. If an 334 * address was specified, find that one instead of the 335 * first one on the interface, if possible. 336 */ 337 NET_EPOCH_ENTER(et); 338 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 339 if (ifa->ifa_addr->sa_family != AF_INET) 340 continue; 341 ia = (struct in_ifaddr *)ifa; 342 if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr) 343 break; 344 } 345 if (ifa == NULL) 346 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 347 if (ifa->ifa_addr->sa_family == AF_INET) { 348 ia = (struct in_ifaddr *)ifa; 349 if (prison_check_ip4(td->td_ucred, 350 &ia->ia_addr.sin_addr) == 0) 351 break; 352 } 353 354 if (ifa == NULL) { 355 NET_EPOCH_EXIT(et); 356 return (EADDRNOTAVAIL); 357 } 358 359 error = 0; 360 switch (cmd) { 361 case SIOCGIFADDR: 362 *addr = ia->ia_addr; 363 break; 364 365 case SIOCGIFBRDADDR: 366 if ((ifp->if_flags & IFF_BROADCAST) == 0) { 367 error = EINVAL; 368 break; 369 } 370 *addr = ia->ia_broadaddr; 371 break; 372 373 case SIOCGIFDSTADDR: 374 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 375 error = EINVAL; 376 break; 377 } 378 *addr = ia->ia_dstaddr; 379 break; 380 381 case SIOCGIFNETMASK: 382 *addr = ia->ia_sockmask; 383 break; 384 } 385 386 NET_EPOCH_EXIT(et); 387 388 return (error); 389 } 390 391 static int 392 in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td) 393 { 394 const struct in_aliasreq *ifra = (struct in_aliasreq *)data; 395 const struct sockaddr_in *addr = &ifra->ifra_addr; 396 const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr; 397 const struct sockaddr_in *mask = &ifra->ifra_mask; 398 const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr; 399 const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0; 400 struct epoch_tracker et; 401 struct ifaddr *ifa; 402 struct in_ifaddr *ia; 403 bool iaIsFirst; 404 int error = 0; 405 406 error = priv_check(td, PRIV_NET_ADDIFADDR); 407 if (error) 408 return (error); 409 410 /* 411 * ifra_addr must be present and be of INET family. 412 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional. 413 */ 414 if (addr->sin_len != sizeof(struct sockaddr_in) || 415 addr->sin_family != AF_INET) 416 return (EINVAL); 417 if (broadaddr->sin_len != 0 && 418 (broadaddr->sin_len != sizeof(struct sockaddr_in) || 419 broadaddr->sin_family != AF_INET)) 420 return (EINVAL); 421 if (mask->sin_len != 0 && 422 (mask->sin_len != sizeof(struct sockaddr_in) || 423 mask->sin_family != AF_INET)) 424 return (EINVAL); 425 if ((ifp->if_flags & IFF_POINTOPOINT) && 426 (dstaddr->sin_len != sizeof(struct sockaddr_in) || 427 dstaddr->sin_addr.s_addr == INADDR_ANY)) 428 return (EDESTADDRREQ); 429 if (vhid != 0 && carp_attach_p == NULL) 430 return (EPROTONOSUPPORT); 431 432 /* 433 * See whether address already exist. 434 */ 435 iaIsFirst = true; 436 ia = NULL; 437 NET_EPOCH_ENTER(et); 438 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 439 struct in_ifaddr *it; 440 441 if (ifa->ifa_addr->sa_family != AF_INET) 442 continue; 443 444 it = (struct in_ifaddr *)ifa; 445 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr && 446 prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0) 447 ia = it; 448 else 449 iaIsFirst = false; 450 } 451 NET_EPOCH_EXIT(et); 452 453 if (ia != NULL) 454 (void )in_difaddr_ioctl(cmd, data, ifp, td); 455 456 ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK); 457 ia = (struct in_ifaddr *)ifa; 458 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr; 459 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 460 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask; 461 callout_init_rw(&ia->ia_garp_timer, &ifp->if_addr_lock, 462 CALLOUT_RETURNUNLOCKED); 463 464 ia->ia_ifp = ifp; 465 ia->ia_addr = *addr; 466 if (mask->sin_len != 0) { 467 ia->ia_sockmask = *mask; 468 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr); 469 } else { 470 /* 471 * If netmask isn't supplied, use default for now. 472 * This is deprecated for interfaces other than loopback 473 * or point-to-point; warn in other cases. In the future 474 * we should return an error rather than warning. 475 */ 476 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0) 477 printf("%s: set address: WARNING: network mask" 478 " should be specified; using default mask\n", 479 ifp->if_xname); 480 ia->ia_subnetmask = IN_NETMASK_DEFAULT; 481 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask); 482 } 483 ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask; 484 in_socktrim(&ia->ia_sockmask); 485 486 if (ifp->if_flags & IFF_BROADCAST) { 487 if (broadaddr->sin_len != 0) { 488 ia->ia_broadaddr = *broadaddr; 489 } else if (ia->ia_subnetmask == IN_RFC3021_MASK) { 490 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST; 491 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in); 492 ia->ia_broadaddr.sin_family = AF_INET; 493 } else { 494 ia->ia_broadaddr.sin_addr.s_addr = 495 htonl(ia->ia_subnet | ~ia->ia_subnetmask); 496 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in); 497 ia->ia_broadaddr.sin_family = AF_INET; 498 } 499 } 500 501 if (ifp->if_flags & IFF_POINTOPOINT) 502 ia->ia_dstaddr = *dstaddr; 503 504 if (vhid != 0) { 505 error = (*carp_attach_p)(&ia->ia_ifa, vhid); 506 if (error) 507 return (error); 508 } 509 510 /* if_addrhead is already referenced by ifa_alloc() */ 511 IF_ADDR_WLOCK(ifp); 512 CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link); 513 IF_ADDR_WUNLOCK(ifp); 514 515 ifa_ref(ifa); /* in_ifaddrhead */ 516 sx_assert(&in_control_sx, SA_XLOCKED); 517 CK_STAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link); 518 CK_LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, 519 ia_hash); 520 521 /* 522 * Give the interface a chance to initialize 523 * if this is its first address, 524 * and to validate the address if necessary. 525 */ 526 if (ifp->if_ioctl != NULL) { 527 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 528 if (error) 529 goto fail1; 530 } 531 532 /* 533 * Add route for the network. 534 */ 535 if (vhid == 0) { 536 error = in_addprefix(ia); 537 if (error) 538 goto fail1; 539 } 540 541 /* 542 * Add a loopback route to self. 543 */ 544 if (vhid == 0 && ia_need_loopback_route(ia)) { 545 struct in_ifaddr *eia; 546 547 eia = in_localip_more(ia); 548 549 if (eia == NULL) { 550 error = ifa_add_loopback_route((struct ifaddr *)ia, 551 (struct sockaddr *)&ia->ia_addr); 552 if (error) 553 goto fail2; 554 } else 555 ifa_free(&eia->ia_ifa); 556 } 557 558 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) { 559 struct in_addr allhosts_addr; 560 struct in_ifinfo *ii; 561 562 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 563 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP); 564 565 error = in_joingroup(ifp, &allhosts_addr, NULL, 566 &ii->ii_allhosts); 567 } 568 569 /* 570 * Note: we don't need extra reference for ifa, since we called 571 * with sx lock held, and ifaddr can not be deleted in concurrent 572 * thread. 573 */ 574 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, ifa, IFADDR_EVENT_ADD); 575 576 return (error); 577 578 fail2: 579 if (vhid == 0) 580 (void )in_scrubprefix(ia, LLE_STATIC); 581 582 fail1: 583 if (ia->ia_ifa.ifa_carp) 584 (*carp_detach_p)(&ia->ia_ifa, false); 585 586 IF_ADDR_WLOCK(ifp); 587 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link); 588 IF_ADDR_WUNLOCK(ifp); 589 ifa_free(&ia->ia_ifa); /* if_addrhead */ 590 591 sx_assert(&in_control_sx, SA_XLOCKED); 592 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link); 593 CK_LIST_REMOVE(ia, ia_hash); 594 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 595 596 return (error); 597 } 598 599 static int 600 in_difaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td) 601 { 602 const struct ifreq *ifr = (struct ifreq *)data; 603 const struct sockaddr_in *addr = (const struct sockaddr_in *) 604 &ifr->ifr_addr; 605 struct ifaddr *ifa; 606 struct in_ifaddr *ia; 607 bool deleteAny, iaIsLast; 608 int error; 609 610 if (td != NULL) { 611 error = priv_check(td, PRIV_NET_DELIFADDR); 612 if (error) 613 return (error); 614 } 615 616 if (addr->sin_len != sizeof(struct sockaddr_in) || 617 addr->sin_family != AF_INET) 618 deleteAny = true; 619 else 620 deleteAny = false; 621 622 iaIsLast = true; 623 ia = NULL; 624 IF_ADDR_WLOCK(ifp); 625 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 626 struct in_ifaddr *it; 627 628 if (ifa->ifa_addr->sa_family != AF_INET) 629 continue; 630 631 it = (struct in_ifaddr *)ifa; 632 if (deleteAny && ia == NULL && (td == NULL || 633 prison_check_ip4(td->td_ucred, &it->ia_addr.sin_addr) == 0)) 634 ia = it; 635 636 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr && 637 (td == NULL || prison_check_ip4(td->td_ucred, 638 &addr->sin_addr) == 0)) 639 ia = it; 640 641 if (it != ia) 642 iaIsLast = false; 643 } 644 645 if (ia == NULL) { 646 IF_ADDR_WUNLOCK(ifp); 647 return (EADDRNOTAVAIL); 648 } 649 650 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link); 651 IF_ADDR_WUNLOCK(ifp); 652 ifa_free(&ia->ia_ifa); /* if_addrhead */ 653 654 sx_assert(&in_control_sx, SA_XLOCKED); 655 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link); 656 CK_LIST_REMOVE(ia, ia_hash); 657 658 /* 659 * in_scrubprefix() kills the interface route. 660 */ 661 in_scrubprefix(ia, LLE_STATIC); 662 663 /* 664 * in_ifadown gets rid of all the rest of 665 * the routes. This is not quite the right 666 * thing to do, but at least if we are running 667 * a routing process they will come back. 668 */ 669 in_ifadown(&ia->ia_ifa, 1); 670 671 if (ia->ia_ifa.ifa_carp) 672 (*carp_detach_p)(&ia->ia_ifa, cmd == SIOCAIFADDR); 673 674 /* 675 * If this is the last IPv4 address configured on this 676 * interface, leave the all-hosts group. 677 * No state-change report need be transmitted. 678 */ 679 if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) { 680 struct in_ifinfo *ii; 681 682 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]); 683 if (ii->ii_allhosts) { 684 (void)in_leavegroup(ii->ii_allhosts, NULL); 685 ii->ii_allhosts = NULL; 686 } 687 } 688 689 IF_ADDR_WLOCK(ifp); 690 if (callout_stop(&ia->ia_garp_timer) == 1) { 691 ifa_free(&ia->ia_ifa); 692 } 693 IF_ADDR_WUNLOCK(ifp); 694 695 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa, 696 IFADDR_EVENT_DEL); 697 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */ 698 699 return (0); 700 } 701 702 static int 703 in_gifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td) 704 { 705 struct in_aliasreq *ifra = (struct in_aliasreq *)data; 706 const struct sockaddr_in *addr = &ifra->ifra_addr; 707 struct epoch_tracker et; 708 struct ifaddr *ifa; 709 struct in_ifaddr *ia; 710 711 /* 712 * ifra_addr must be present and be of INET family. 713 */ 714 if (addr->sin_len != sizeof(struct sockaddr_in) || 715 addr->sin_family != AF_INET) 716 return (EINVAL); 717 718 /* 719 * See whether address exist. 720 */ 721 ia = NULL; 722 NET_EPOCH_ENTER(et); 723 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 724 struct in_ifaddr *it; 725 726 if (ifa->ifa_addr->sa_family != AF_INET) 727 continue; 728 729 it = (struct in_ifaddr *)ifa; 730 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr && 731 prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0) { 732 ia = it; 733 break; 734 } 735 } 736 if (ia == NULL) { 737 NET_EPOCH_EXIT(et); 738 return (EADDRNOTAVAIL); 739 } 740 741 ifra->ifra_mask = ia->ia_sockmask; 742 if ((ifp->if_flags & IFF_POINTOPOINT) && 743 ia->ia_dstaddr.sin_family == AF_INET) 744 ifra->ifra_dstaddr = ia->ia_dstaddr; 745 else if ((ifp->if_flags & IFF_BROADCAST) && 746 ia->ia_broadaddr.sin_family == AF_INET) 747 ifra->ifra_broadaddr = ia->ia_broadaddr; 748 else 749 memset(&ifra->ifra_broadaddr, 0, 750 sizeof(ifra->ifra_broadaddr)); 751 752 NET_EPOCH_EXIT(et); 753 return (0); 754 } 755 756 static int 757 in_match_ifaddr(const struct rtentry *rt, const struct nhop_object *nh, void *arg) 758 { 759 760 if (nh->nh_ifa == (struct ifaddr *)arg) 761 return (1); 762 763 return (0); 764 } 765 766 static int 767 in_handle_prefix_route(uint32_t fibnum, int cmd, 768 struct sockaddr_in *dst, struct sockaddr_in *netmask, struct ifaddr *ifa, 769 struct ifnet *ifp) 770 { 771 772 NET_EPOCH_ASSERT(); 773 774 /* Prepare gateway */ 775 struct sockaddr_dl_short sdl = { 776 .sdl_family = AF_LINK, 777 .sdl_len = sizeof(struct sockaddr_dl_short), 778 .sdl_type = ifa->ifa_ifp->if_type, 779 .sdl_index = ifa->ifa_ifp->if_index, 780 }; 781 782 struct rt_addrinfo info = { 783 .rti_ifa = ifa, 784 .rti_ifp = ifp, 785 .rti_flags = RTF_PINNED | ((netmask != NULL) ? 0 : RTF_HOST), 786 .rti_info = { 787 [RTAX_DST] = (struct sockaddr *)dst, 788 [RTAX_NETMASK] = (struct sockaddr *)netmask, 789 [RTAX_GATEWAY] = (struct sockaddr *)&sdl, 790 }, 791 /* Ensure we delete the prefix IFF prefix ifa matches */ 792 .rti_filter = in_match_ifaddr, 793 .rti_filterdata = ifa, 794 }; 795 796 return (rib_handle_ifaddr_info(fibnum, cmd, &info)); 797 } 798 799 /* 800 * Routing table interaction with interface addresses. 801 * 802 * In general, two types of routes needs to be installed: 803 * a) "interface" or "prefix" route, telling user that the addresses 804 * behind the ifa prefix are reached directly. 805 * b) "loopback" route installed for the ifa address, telling user that 806 * the address belongs to local system. 807 * 808 * Handling for (a) and (b) differs in multi-fib aspects, hence they 809 * are implemented in different functions below. 810 * 811 * The cases above may intersect - /32 interface aliases results in 812 * the same prefix produced by (a) and (b). This blurs the definition 813 * of the "loopback" route and complicate interactions. The interaction 814 * table is defined below. The case numbers are used in the multiple 815 * functions below to refer to the particular test case. 816 * 817 * There can be multiple options: 818 * 1) Adding address with prefix on non-p2p/non-loopback interface. 819 * Example: 192.0.2.1/24. Action: 820 * * add "prefix" route towards 192.0.2.0/24 via @ia interface, 821 * using @ia as an address source. 822 * * add "loopback" route towards 192.0.2.1 via V_loif, saving 823 * @ia ifp in the gateway and using @ia as an address source. 824 * 825 * 2) Adding address with /32 mask to non-p2p/non-loopback interface. 826 * Example: 192.0.2.2/32. Action: 827 * * add "prefix" host route via V_loif, using @ia as an address source. 828 * 829 * 3) Adding address with or without prefix to p2p interface. 830 * Example: 10.0.0.1/24->10.0.0.2. Action: 831 * * add "prefix" host route towards 10.0.0.2 via this interface, using @ia 832 * as an address source. Note: no sense in installing full /24 as the interface 833 * is point-to-point. 834 * * add "loopback" route towards 10.0.9.1 via V_loif, saving 835 * @ia ifp in the gateway and using @ia as an address source. 836 * 837 * 4) Adding address with or without prefix to loopback interface. 838 * Example: 192.0.2.1/24. Action: 839 * * add "prefix" host route via @ia interface, using @ia as an address source. 840 * Note: Skip installing /24 prefix as it would introduce TTL loop 841 * for the traffic destined to these addresses. 842 */ 843 844 /* 845 * Checks if @ia needs to install loopback route to @ia address via 846 * ifa_maintain_loopback_route(). 847 * 848 * Return true on success. 849 */ 850 static bool 851 ia_need_loopback_route(const struct in_ifaddr *ia) 852 { 853 struct ifnet *ifp = ia->ia_ifp; 854 855 /* Case 4: Skip loopback interfaces */ 856 if ((ifp->if_flags & IFF_LOOPBACK) || 857 (ia->ia_addr.sin_addr.s_addr == INADDR_ANY)) 858 return (false); 859 860 /* Clash avoidance: Skip p2p interfaces with both addresses are equal */ 861 if ((ifp->if_flags & IFF_POINTOPOINT) && 862 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 863 return (false); 864 865 /* Case 2: skip /32 prefixes */ 866 if (!(ifp->if_flags & IFF_POINTOPOINT) && 867 (ia->ia_sockmask.sin_addr.s_addr == INADDR_BROADCAST)) 868 return (false); 869 870 return (true); 871 } 872 873 /* 874 * Calculate "prefix" route corresponding to @ia. 875 */ 876 static void 877 ia_getrtprefix(const struct in_ifaddr *ia, struct in_addr *prefix, struct in_addr *mask) 878 { 879 880 if (ia->ia_ifp->if_flags & IFF_POINTOPOINT) { 881 /* Case 3: return host route for dstaddr */ 882 *prefix = ia->ia_dstaddr.sin_addr; 883 mask->s_addr = INADDR_BROADCAST; 884 } else if (ia->ia_ifp->if_flags & IFF_LOOPBACK) { 885 /* Case 4: return host route for ifaddr */ 886 *prefix = ia->ia_addr.sin_addr; 887 mask->s_addr = INADDR_BROADCAST; 888 } else { 889 /* Cases 1,2: return actual ia prefix */ 890 *prefix = ia->ia_addr.sin_addr; 891 *mask = ia->ia_sockmask.sin_addr; 892 prefix->s_addr &= mask->s_addr; 893 } 894 } 895 896 /* 897 * Adds or delete interface "prefix" route corresponding to @ifa. 898 * Returns 0 on success or errno. 899 */ 900 int 901 in_handle_ifaddr_route(int cmd, struct in_ifaddr *ia) 902 { 903 struct ifaddr *ifa = &ia->ia_ifa; 904 struct in_addr daddr, maddr; 905 struct sockaddr_in *pmask; 906 struct epoch_tracker et; 907 int error; 908 909 ia_getrtprefix(ia, &daddr, &maddr); 910 911 struct sockaddr_in mask = { 912 .sin_family = AF_INET, 913 .sin_len = sizeof(struct sockaddr_in), 914 .sin_addr = maddr, 915 }; 916 917 pmask = (maddr.s_addr != INADDR_BROADCAST) ? &mask : NULL; 918 919 struct sockaddr_in dst = { 920 .sin_family = AF_INET, 921 .sin_len = sizeof(struct sockaddr_in), 922 .sin_addr.s_addr = daddr.s_addr & maddr.s_addr, 923 }; 924 925 struct ifnet *ifp = ia->ia_ifp; 926 927 if ((maddr.s_addr == INADDR_BROADCAST) && 928 (!(ia->ia_ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)))) { 929 /* Case 2: host route on broadcast interface */ 930 ifp = V_loif; 931 } 932 933 uint32_t fibnum = ifa->ifa_ifp->if_fib; 934 NET_EPOCH_ENTER(et); 935 error = in_handle_prefix_route(fibnum, cmd, &dst, pmask, ifa, ifp); 936 NET_EPOCH_EXIT(et); 937 938 return (error); 939 } 940 941 /* 942 * Check if we have a route for the given prefix already. 943 */ 944 static bool 945 in_hasrtprefix(struct in_ifaddr *target) 946 { 947 struct epoch_tracker et; 948 struct in_ifaddr *ia; 949 struct in_addr prefix, mask, p, m; 950 bool result = false; 951 952 ia_getrtprefix(target, &prefix, &mask); 953 954 /* Look for an existing address with the same prefix, mask, and fib */ 955 NET_EPOCH_ENTER(et); 956 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 957 ia_getrtprefix(ia, &p, &m); 958 959 if (prefix.s_addr != p.s_addr || 960 mask.s_addr != m.s_addr) 961 continue; 962 963 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib) 964 continue; 965 966 /* 967 * If we got a matching prefix route inserted by other 968 * interface address, we are done here. 969 */ 970 if (ia->ia_flags & IFA_ROUTE) { 971 result = true; 972 break; 973 } 974 } 975 NET_EPOCH_EXIT(et); 976 977 return (result); 978 } 979 980 int 981 in_addprefix(struct in_ifaddr *target) 982 { 983 int error; 984 985 if (in_hasrtprefix(target)) { 986 if (V_nosameprefix) 987 return (EEXIST); 988 else { 989 rt_addrmsg(RTM_ADD, &target->ia_ifa, 990 target->ia_ifp->if_fib); 991 return (0); 992 } 993 } 994 995 /* 996 * No-one seem to have this prefix route, so we try to insert it. 997 */ 998 rt_addrmsg(RTM_ADD, &target->ia_ifa, target->ia_ifp->if_fib); 999 error = in_handle_ifaddr_route(RTM_ADD, target); 1000 if (!error) 1001 target->ia_flags |= IFA_ROUTE; 1002 return (error); 1003 } 1004 1005 /* 1006 * Removes either all lle entries for given @ia, or lle 1007 * corresponding to @ia address. 1008 */ 1009 static void 1010 in_scrubprefixlle(struct in_ifaddr *ia, int all, u_int flags) 1011 { 1012 struct sockaddr_in addr, mask; 1013 struct sockaddr *saddr, *smask; 1014 struct ifnet *ifp; 1015 1016 saddr = (struct sockaddr *)&addr; 1017 bzero(&addr, sizeof(addr)); 1018 addr.sin_len = sizeof(addr); 1019 addr.sin_family = AF_INET; 1020 smask = (struct sockaddr *)&mask; 1021 bzero(&mask, sizeof(mask)); 1022 mask.sin_len = sizeof(mask); 1023 mask.sin_family = AF_INET; 1024 mask.sin_addr.s_addr = ia->ia_subnetmask; 1025 ifp = ia->ia_ifp; 1026 1027 if (all) { 1028 /* 1029 * Remove all L2 entries matching given prefix. 1030 * Convert address to host representation to avoid 1031 * doing this on every callback. ia_subnetmask is already 1032 * stored in host representation. 1033 */ 1034 addr.sin_addr.s_addr = ntohl(ia->ia_addr.sin_addr.s_addr); 1035 lltable_prefix_free(AF_INET, saddr, smask, flags); 1036 } else { 1037 /* Remove interface address only */ 1038 addr.sin_addr.s_addr = ia->ia_addr.sin_addr.s_addr; 1039 lltable_delete_addr(LLTABLE(ifp), LLE_IFADDR, saddr); 1040 } 1041 } 1042 1043 /* 1044 * If there is no other address in the system that can serve a route to the 1045 * same prefix, remove the route. Hand over the route to the new address 1046 * otherwise. 1047 */ 1048 int 1049 in_scrubprefix(struct in_ifaddr *target, u_int flags) 1050 { 1051 struct epoch_tracker et; 1052 struct in_ifaddr *ia; 1053 struct in_addr prefix, mask, p, m; 1054 int error = 0; 1055 1056 /* 1057 * Remove the loopback route to the interface address. 1058 */ 1059 if (ia_need_loopback_route(target) && (flags & LLE_STATIC)) { 1060 struct in_ifaddr *eia; 1061 1062 eia = in_localip_more(target); 1063 1064 if (eia != NULL) { 1065 error = ifa_switch_loopback_route((struct ifaddr *)eia, 1066 (struct sockaddr *)&target->ia_addr); 1067 ifa_free(&eia->ia_ifa); 1068 } else { 1069 error = ifa_del_loopback_route((struct ifaddr *)target, 1070 (struct sockaddr *)&target->ia_addr); 1071 } 1072 } 1073 1074 ia_getrtprefix(target, &prefix, &mask); 1075 1076 if ((target->ia_flags & IFA_ROUTE) == 0) { 1077 rt_addrmsg(RTM_DELETE, &target->ia_ifa, target->ia_ifp->if_fib); 1078 1079 /* 1080 * Removing address from !IFF_UP interface or 1081 * prefix which exists on other interface (along with route). 1082 * No entries should exist here except target addr. 1083 * Given that, delete this entry only. 1084 */ 1085 in_scrubprefixlle(target, 0, flags); 1086 return (0); 1087 } 1088 1089 NET_EPOCH_ENTER(et); 1090 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) { 1091 ia_getrtprefix(ia, &p, &m); 1092 1093 if (prefix.s_addr != p.s_addr || 1094 mask.s_addr != m.s_addr) 1095 continue; 1096 1097 if ((ia->ia_ifp->if_flags & IFF_UP) == 0) 1098 continue; 1099 1100 /* 1101 * If we got a matching prefix address, move IFA_ROUTE and 1102 * the route itself to it. Make sure that routing daemons 1103 * get a heads-up. 1104 */ 1105 if ((ia->ia_flags & IFA_ROUTE) == 0) { 1106 ifa_ref(&ia->ia_ifa); 1107 NET_EPOCH_EXIT(et); 1108 error = in_handle_ifaddr_route(RTM_DELETE, target); 1109 if (error == 0) 1110 target->ia_flags &= ~IFA_ROUTE; 1111 else 1112 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n", 1113 error); 1114 /* Scrub all entries IFF interface is different */ 1115 in_scrubprefixlle(target, target->ia_ifp != ia->ia_ifp, 1116 flags); 1117 error = in_handle_ifaddr_route(RTM_ADD, ia); 1118 if (error == 0) 1119 ia->ia_flags |= IFA_ROUTE; 1120 else 1121 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n", 1122 error); 1123 ifa_free(&ia->ia_ifa); 1124 return (error); 1125 } 1126 } 1127 NET_EPOCH_EXIT(et); 1128 1129 /* 1130 * remove all L2 entries on the given prefix 1131 */ 1132 in_scrubprefixlle(target, 1, flags); 1133 1134 /* 1135 * As no-one seem to have this prefix, we can remove the route. 1136 */ 1137 rt_addrmsg(RTM_DELETE, &target->ia_ifa, target->ia_ifp->if_fib); 1138 error = in_handle_ifaddr_route(RTM_DELETE, target); 1139 if (error == 0) 1140 target->ia_flags &= ~IFA_ROUTE; 1141 else 1142 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error); 1143 return (error); 1144 } 1145 1146 void 1147 in_ifscrub_all(void) 1148 { 1149 struct ifnet *ifp; 1150 struct ifaddr *ifa, *nifa; 1151 struct ifaliasreq ifr; 1152 1153 IFNET_RLOCK(); 1154 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1155 /* Cannot lock here - lock recursion. */ 1156 /* NET_EPOCH_ENTER(et); */ 1157 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) { 1158 if (ifa->ifa_addr->sa_family != AF_INET) 1159 continue; 1160 1161 /* 1162 * This is ugly but the only way for legacy IP to 1163 * cleanly remove addresses and everything attached. 1164 */ 1165 bzero(&ifr, sizeof(ifr)); 1166 ifr.ifra_addr = *ifa->ifa_addr; 1167 if (ifa->ifa_dstaddr) 1168 ifr.ifra_broadaddr = *ifa->ifa_dstaddr; 1169 (void)in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, 1170 ifp, NULL); 1171 } 1172 /* NET_EPOCH_EXIT(et); */ 1173 in_purgemaddrs(ifp); 1174 igmp_domifdetach(ifp); 1175 } 1176 IFNET_RUNLOCK(); 1177 } 1178 1179 int 1180 in_ifaddr_broadcast(struct in_addr in, struct in_ifaddr *ia) 1181 { 1182 1183 return ((in.s_addr == ia->ia_broadaddr.sin_addr.s_addr || 1184 /* 1185 * Optionally check for old-style (host 0) broadcast, but 1186 * taking into account that RFC 3021 obsoletes it. 1187 */ 1188 (V_broadcast_lowest && ia->ia_subnetmask != IN_RFC3021_MASK && 1189 ntohl(in.s_addr) == ia->ia_subnet)) && 1190 /* 1191 * Check for an all one subnetmask. These 1192 * only exist when an interface gets a secondary 1193 * address. 1194 */ 1195 ia->ia_subnetmask != (u_long)0xffffffff); 1196 } 1197 1198 /* 1199 * Return 1 if the address might be a local broadcast address. 1200 */ 1201 int 1202 in_broadcast(struct in_addr in, struct ifnet *ifp) 1203 { 1204 struct ifaddr *ifa; 1205 int found; 1206 1207 NET_EPOCH_ASSERT(); 1208 1209 if (in.s_addr == INADDR_BROADCAST || 1210 in.s_addr == INADDR_ANY) 1211 return (1); 1212 if ((ifp->if_flags & IFF_BROADCAST) == 0) 1213 return (0); 1214 found = 0; 1215 /* 1216 * Look through the list of addresses for a match 1217 * with a broadcast address. 1218 */ 1219 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1220 if (ifa->ifa_addr->sa_family == AF_INET && 1221 in_ifaddr_broadcast(in, (struct in_ifaddr *)ifa)) { 1222 found = 1; 1223 break; 1224 } 1225 return (found); 1226 } 1227 1228 /* 1229 * On interface removal, clean up IPv4 data structures hung off of the ifnet. 1230 */ 1231 void 1232 in_ifdetach(struct ifnet *ifp) 1233 { 1234 IN_MULTI_LOCK(); 1235 in_pcbpurgeif0(&V_ripcbinfo, ifp); 1236 in_pcbpurgeif0(&V_udbinfo, ifp); 1237 in_pcbpurgeif0(&V_ulitecbinfo, ifp); 1238 in_purgemaddrs(ifp); 1239 IN_MULTI_UNLOCK(); 1240 1241 /* 1242 * Make sure all multicast deletions invoking if_ioctl() are 1243 * completed before returning. Else we risk accessing a freed 1244 * ifnet structure pointer. 1245 */ 1246 inm_release_wait(NULL); 1247 } 1248 1249 /* 1250 * Delete all IPv4 multicast address records, and associated link-layer 1251 * multicast address records, associated with ifp. 1252 * XXX It looks like domifdetach runs AFTER the link layer cleanup. 1253 * XXX This should not race with ifma_protospec being set during 1254 * a new allocation, if it does, we have bigger problems. 1255 */ 1256 static void 1257 in_purgemaddrs(struct ifnet *ifp) 1258 { 1259 struct in_multi_head purgeinms; 1260 struct in_multi *inm; 1261 struct ifmultiaddr *ifma, *next; 1262 1263 SLIST_INIT(&purgeinms); 1264 IN_MULTI_LIST_LOCK(); 1265 1266 /* 1267 * Extract list of in_multi associated with the detaching ifp 1268 * which the PF_INET layer is about to release. 1269 * We need to do this as IF_ADDR_LOCK() may be re-acquired 1270 * by code further down. 1271 */ 1272 IF_ADDR_WLOCK(ifp); 1273 restart: 1274 CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) { 1275 if (ifma->ifma_addr->sa_family != AF_INET || 1276 ifma->ifma_protospec == NULL) 1277 continue; 1278 inm = (struct in_multi *)ifma->ifma_protospec; 1279 inm_rele_locked(&purgeinms, inm); 1280 if (__predict_false(ifma_restart)) { 1281 ifma_restart = true; 1282 goto restart; 1283 } 1284 } 1285 IF_ADDR_WUNLOCK(ifp); 1286 1287 inm_release_list_deferred(&purgeinms); 1288 igmp_ifdetach(ifp); 1289 IN_MULTI_LIST_UNLOCK(); 1290 } 1291 1292 struct in_llentry { 1293 struct llentry base; 1294 }; 1295 1296 #define IN_LLTBL_DEFAULT_HSIZE 32 1297 #define IN_LLTBL_HASH(k, h) \ 1298 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1)) 1299 1300 /* 1301 * Do actual deallocation of @lle. 1302 */ 1303 static void 1304 in_lltable_destroy_lle_unlocked(epoch_context_t ctx) 1305 { 1306 struct llentry *lle; 1307 1308 lle = __containerof(ctx, struct llentry, lle_epoch_ctx); 1309 LLE_LOCK_DESTROY(lle); 1310 LLE_REQ_DESTROY(lle); 1311 free(lle, M_LLTABLE); 1312 } 1313 1314 /* 1315 * Called by LLE_FREE_LOCKED when number of references 1316 * drops to zero. 1317 */ 1318 static void 1319 in_lltable_destroy_lle(struct llentry *lle) 1320 { 1321 1322 LLE_WUNLOCK(lle); 1323 NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx); 1324 } 1325 1326 static struct llentry * 1327 in_lltable_new(struct in_addr addr4, u_int flags) 1328 { 1329 struct in_llentry *lle; 1330 1331 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO); 1332 if (lle == NULL) /* NB: caller generates msg */ 1333 return NULL; 1334 1335 /* 1336 * For IPv4 this will trigger "arpresolve" to generate 1337 * an ARP request. 1338 */ 1339 lle->base.la_expire = time_uptime; /* mark expired */ 1340 lle->base.r_l3addr.addr4 = addr4; 1341 lle->base.lle_refcnt = 1; 1342 lle->base.lle_free = in_lltable_destroy_lle; 1343 LLE_LOCK_INIT(&lle->base); 1344 LLE_REQ_INIT(&lle->base); 1345 callout_init(&lle->base.lle_timer, 1); 1346 1347 return (&lle->base); 1348 } 1349 1350 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 1351 ((((d).s_addr ^ (a).s_addr) & (m).s_addr)) == 0 ) 1352 1353 static int 1354 in_lltable_match_prefix(const struct sockaddr *saddr, 1355 const struct sockaddr *smask, u_int flags, struct llentry *lle) 1356 { 1357 struct in_addr addr, mask, lle_addr; 1358 1359 addr = ((const struct sockaddr_in *)saddr)->sin_addr; 1360 mask = ((const struct sockaddr_in *)smask)->sin_addr; 1361 lle_addr.s_addr = ntohl(lle->r_l3addr.addr4.s_addr); 1362 1363 if (IN_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0) 1364 return (0); 1365 1366 if (lle->la_flags & LLE_IFADDR) { 1367 /* 1368 * Delete LLE_IFADDR records IFF address & flag matches. 1369 * Note that addr is the interface address within prefix 1370 * being matched. 1371 * Note also we should handle 'ifdown' cases without removing 1372 * ifaddr macs. 1373 */ 1374 if (addr.s_addr == lle_addr.s_addr && (flags & LLE_STATIC) != 0) 1375 return (1); 1376 return (0); 1377 } 1378 1379 /* flags & LLE_STATIC means deleting both dynamic and static entries */ 1380 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC)) 1381 return (1); 1382 1383 return (0); 1384 } 1385 1386 static void 1387 in_lltable_free_entry(struct lltable *llt, struct llentry *lle) 1388 { 1389 size_t pkts_dropped; 1390 1391 LLE_WLOCK_ASSERT(lle); 1392 KASSERT(llt != NULL, ("lltable is NULL")); 1393 1394 /* Unlink entry from table if not already */ 1395 if ((lle->la_flags & LLE_LINKED) != 0) { 1396 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp); 1397 lltable_unlink_entry(llt, lle); 1398 } 1399 1400 /* Drop hold queue */ 1401 pkts_dropped = llentry_free(lle); 1402 ARPSTAT_ADD(dropped, pkts_dropped); 1403 } 1404 1405 static int 1406 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr) 1407 { 1408 struct nhop_object *nh; 1409 struct in_addr addr; 1410 1411 KASSERT(l3addr->sa_family == AF_INET, 1412 ("sin_family %d", l3addr->sa_family)); 1413 1414 addr = ((const struct sockaddr_in *)l3addr)->sin_addr; 1415 1416 nh = fib4_lookup(ifp->if_fib, addr, 0, NHR_NONE, 0); 1417 if (nh == NULL) 1418 return (EINVAL); 1419 1420 /* 1421 * If the gateway for an existing host route matches the target L3 1422 * address, which is a special route inserted by some implementation 1423 * such as MANET, and the interface is of the correct type, then 1424 * allow for ARP to proceed. 1425 */ 1426 if (nh->nh_flags & NHF_GATEWAY) { 1427 if (!(nh->nh_flags & NHF_HOST) || nh->nh_ifp->if_type != IFT_ETHER || 1428 (nh->nh_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 || 1429 memcmp(nh->gw_sa.sa_data, l3addr->sa_data, 1430 sizeof(in_addr_t)) != 0) { 1431 return (EINVAL); 1432 } 1433 } 1434 1435 /* 1436 * Make sure that at least the destination address is covered 1437 * by the route. This is for handling the case where 2 or more 1438 * interfaces have the same prefix. An incoming packet arrives 1439 * on one interface and the corresponding outgoing packet leaves 1440 * another interface. 1441 */ 1442 if ((nh->nh_ifp != ifp) && (nh->nh_flags & NHF_HOST) == 0) { 1443 struct in_ifaddr *ia = (struct in_ifaddr *)ifaof_ifpforaddr(l3addr, ifp); 1444 struct in_addr dst_addr, mask_addr; 1445 1446 if (ia == NULL) 1447 return (EINVAL); 1448 1449 /* 1450 * ifaof_ifpforaddr() returns _best matching_ IFA. 1451 * It is possible that ifa prefix does not cover our address. 1452 * Explicitly verify and fail if that's the case. 1453 */ 1454 dst_addr = IA_SIN(ia)->sin_addr; 1455 mask_addr.s_addr = htonl(ia->ia_subnetmask); 1456 1457 if (!IN_ARE_MASKED_ADDR_EQUAL(dst_addr, addr, mask_addr)) 1458 return (EINVAL); 1459 } 1460 1461 return (0); 1462 } 1463 1464 static inline uint32_t 1465 in_lltable_hash_dst(const struct in_addr dst, uint32_t hsize) 1466 { 1467 1468 return (IN_LLTBL_HASH(dst.s_addr, hsize)); 1469 } 1470 1471 static uint32_t 1472 in_lltable_hash(const struct llentry *lle, uint32_t hsize) 1473 { 1474 1475 return (in_lltable_hash_dst(lle->r_l3addr.addr4, hsize)); 1476 } 1477 1478 static void 1479 in_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 1480 { 1481 struct sockaddr_in *sin; 1482 1483 sin = (struct sockaddr_in *)sa; 1484 bzero(sin, sizeof(*sin)); 1485 sin->sin_family = AF_INET; 1486 sin->sin_len = sizeof(*sin); 1487 sin->sin_addr = lle->r_l3addr.addr4; 1488 } 1489 1490 static inline struct llentry * 1491 in_lltable_find_dst(struct lltable *llt, struct in_addr dst) 1492 { 1493 struct llentry *lle; 1494 struct llentries *lleh; 1495 u_int hashidx; 1496 1497 hashidx = in_lltable_hash_dst(dst, llt->llt_hsize); 1498 lleh = &llt->lle_head[hashidx]; 1499 CK_LIST_FOREACH(lle, lleh, lle_next) { 1500 if (lle->la_flags & LLE_DELETED) 1501 continue; 1502 if (lle->r_l3addr.addr4.s_addr == dst.s_addr) 1503 break; 1504 } 1505 1506 return (lle); 1507 } 1508 1509 static void 1510 in_lltable_delete_entry(struct lltable *llt, struct llentry *lle) 1511 { 1512 1513 lle->la_flags |= LLE_DELETED; 1514 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED); 1515 #ifdef DIAGNOSTIC 1516 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle); 1517 #endif 1518 llentry_free(lle); 1519 } 1520 1521 static struct llentry * 1522 in_lltable_alloc(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1523 { 1524 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1525 struct ifnet *ifp = llt->llt_ifp; 1526 struct llentry *lle; 1527 char linkhdr[LLE_MAX_LINKHDR]; 1528 size_t linkhdrsize; 1529 int lladdr_off; 1530 1531 KASSERT(l3addr->sa_family == AF_INET, 1532 ("sin_family %d", l3addr->sa_family)); 1533 1534 /* 1535 * A route that covers the given address must have 1536 * been installed 1st because we are doing a resolution, 1537 * verify this. 1538 */ 1539 if (!(flags & LLE_IFADDR) && 1540 in_lltable_rtcheck(ifp, flags, l3addr) != 0) 1541 return (NULL); 1542 1543 lle = in_lltable_new(sin->sin_addr, flags); 1544 if (lle == NULL) { 1545 log(LOG_INFO, "lla_lookup: new lle malloc failed\n"); 1546 return (NULL); 1547 } 1548 lle->la_flags = flags; 1549 if (flags & LLE_STATIC) 1550 lle->r_flags |= RLLE_VALID; 1551 if ((flags & LLE_IFADDR) == LLE_IFADDR) { 1552 linkhdrsize = LLE_MAX_LINKHDR; 1553 if (lltable_calc_llheader(ifp, AF_INET, IF_LLADDR(ifp), 1554 linkhdr, &linkhdrsize, &lladdr_off) != 0) { 1555 NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx); 1556 return (NULL); 1557 } 1558 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize, 1559 lladdr_off); 1560 lle->la_flags |= LLE_STATIC; 1561 lle->r_flags |= (RLLE_VALID | RLLE_IFADDR); 1562 } 1563 1564 return (lle); 1565 } 1566 1567 /* 1568 * Return NULL if not found or marked for deletion. 1569 * If found return lle read locked. 1570 */ 1571 static struct llentry * 1572 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 1573 { 1574 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr; 1575 struct llentry *lle; 1576 1577 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp); 1578 KASSERT(l3addr->sa_family == AF_INET, 1579 ("sin_family %d", l3addr->sa_family)); 1580 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) != 1581 (LLE_UNLOCKED | LLE_EXCLUSIVE), 1582 ("wrong lle request flags: %#x", flags)); 1583 1584 lle = in_lltable_find_dst(llt, sin->sin_addr); 1585 if (lle == NULL) 1586 return (NULL); 1587 if (flags & LLE_UNLOCKED) 1588 return (lle); 1589 1590 if (flags & LLE_EXCLUSIVE) 1591 LLE_WLOCK(lle); 1592 else 1593 LLE_RLOCK(lle); 1594 1595 /* 1596 * If the afdata lock is not held, the LLE may have been unlinked while 1597 * we were blocked on the LLE lock. Check for this case. 1598 */ 1599 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) { 1600 if (flags & LLE_EXCLUSIVE) 1601 LLE_WUNLOCK(lle); 1602 else 1603 LLE_RUNLOCK(lle); 1604 return (NULL); 1605 } 1606 return (lle); 1607 } 1608 1609 static int 1610 in_lltable_dump_entry(struct lltable *llt, struct llentry *lle, 1611 struct sysctl_req *wr) 1612 { 1613 struct ifnet *ifp = llt->llt_ifp; 1614 /* XXX stack use */ 1615 struct { 1616 struct rt_msghdr rtm; 1617 struct sockaddr_in sin; 1618 struct sockaddr_dl sdl; 1619 } arpc; 1620 struct sockaddr_dl *sdl; 1621 int error; 1622 1623 bzero(&arpc, sizeof(arpc)); 1624 /* skip deleted entries */ 1625 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED) 1626 return (0); 1627 /* Skip if jailed and not a valid IP of the prison. */ 1628 lltable_fill_sa_entry(lle,(struct sockaddr *)&arpc.sin); 1629 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&arpc.sin) != 0) 1630 return (0); 1631 /* 1632 * produce a msg made of: 1633 * struct rt_msghdr; 1634 * struct sockaddr_in; (IPv4) 1635 * struct sockaddr_dl; 1636 */ 1637 arpc.rtm.rtm_msglen = sizeof(arpc); 1638 arpc.rtm.rtm_version = RTM_VERSION; 1639 arpc.rtm.rtm_type = RTM_GET; 1640 arpc.rtm.rtm_flags = RTF_UP; 1641 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY; 1642 1643 /* publish */ 1644 if (lle->la_flags & LLE_PUB) 1645 arpc.rtm.rtm_flags |= RTF_ANNOUNCE; 1646 1647 sdl = &arpc.sdl; 1648 sdl->sdl_family = AF_LINK; 1649 sdl->sdl_len = sizeof(*sdl); 1650 sdl->sdl_index = ifp->if_index; 1651 sdl->sdl_type = ifp->if_type; 1652 if ((lle->la_flags & LLE_VALID) == LLE_VALID) { 1653 sdl->sdl_alen = ifp->if_addrlen; 1654 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen); 1655 } else { 1656 sdl->sdl_alen = 0; 1657 bzero(LLADDR(sdl), ifp->if_addrlen); 1658 } 1659 1660 arpc.rtm.rtm_rmx.rmx_expire = 1661 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire; 1662 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA); 1663 if (lle->la_flags & LLE_STATIC) 1664 arpc.rtm.rtm_flags |= RTF_STATIC; 1665 if (lle->la_flags & LLE_IFADDR) 1666 arpc.rtm.rtm_flags |= RTF_PINNED; 1667 arpc.rtm.rtm_index = ifp->if_index; 1668 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc)); 1669 1670 return (error); 1671 } 1672 1673 static struct lltable * 1674 in_lltattach(struct ifnet *ifp) 1675 { 1676 struct lltable *llt; 1677 1678 llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE); 1679 llt->llt_af = AF_INET; 1680 llt->llt_ifp = ifp; 1681 1682 llt->llt_lookup = in_lltable_lookup; 1683 llt->llt_alloc_entry = in_lltable_alloc; 1684 llt->llt_delete_entry = in_lltable_delete_entry; 1685 llt->llt_dump_entry = in_lltable_dump_entry; 1686 llt->llt_hash = in_lltable_hash; 1687 llt->llt_fill_sa_entry = in_lltable_fill_sa_entry; 1688 llt->llt_free_entry = in_lltable_free_entry; 1689 llt->llt_match_prefix = in_lltable_match_prefix; 1690 llt->llt_mark_used = llentry_mark_used; 1691 lltable_link(llt); 1692 1693 return (llt); 1694 } 1695 1696 void * 1697 in_domifattach(struct ifnet *ifp) 1698 { 1699 struct in_ifinfo *ii; 1700 1701 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO); 1702 1703 ii->ii_llt = in_lltattach(ifp); 1704 ii->ii_igmp = igmp_domifattach(ifp); 1705 1706 return (ii); 1707 } 1708 1709 void 1710 in_domifdetach(struct ifnet *ifp, void *aux) 1711 { 1712 struct in_ifinfo *ii = (struct in_ifinfo *)aux; 1713 1714 igmp_domifdetach(ifp); 1715 lltable_free(ii->ii_llt); 1716 free(ii, M_IFADDR); 1717 } 1718