if_bridge.c revision 1.115
1 /* $NetBSD: if_bridge.c,v 1.115 2016/04/19 07:10:22 ozaki-r Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (c) 1999, 2000 Jason L. Wright (jason (at) thought.net) 40 * All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by Jason L. Wright 53 * 4. The name of the author may not be used to endorse or promote products 54 * derived from this software without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 57 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 58 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 59 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 60 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 61 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 62 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 64 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 65 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 66 * POSSIBILITY OF SUCH DAMAGE. 67 * 68 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 69 */ 70 71 /* 72 * Network interface bridge support. 73 * 74 * TODO: 75 * 76 * - Currently only supports Ethernet-like interfaces (Ethernet, 77 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 78 * to bridge other types of interfaces (FDDI-FDDI, and maybe 79 * consider heterogenous bridges). 80 */ 81 82 #include <sys/cdefs.h> 83 __KERNEL_RCSID(0, "$NetBSD: if_bridge.c,v 1.115 2016/04/19 07:10:22 ozaki-r Exp $"); 84 85 #ifdef _KERNEL_OPT 86 #include "opt_bridge_ipf.h" 87 #include "opt_inet.h" 88 #include "opt_net_mpsafe.h" 89 #endif /* _KERNEL_OPT */ 90 91 #include <sys/param.h> 92 #include <sys/kernel.h> 93 #include <sys/mbuf.h> 94 #include <sys/queue.h> 95 #include <sys/socket.h> 96 #include <sys/socketvar.h> /* for softnet_lock */ 97 #include <sys/sockio.h> 98 #include <sys/systm.h> 99 #include <sys/proc.h> 100 #include <sys/pool.h> 101 #include <sys/kauth.h> 102 #include <sys/cpu.h> 103 #include <sys/cprng.h> 104 #include <sys/mutex.h> 105 #include <sys/kmem.h> 106 107 #include <net/bpf.h> 108 #include <net/if.h> 109 #include <net/if_dl.h> 110 #include <net/if_types.h> 111 #include <net/if_llc.h> 112 113 #include <net/if_ether.h> 114 #include <net/if_bridgevar.h> 115 116 #if defined(BRIDGE_IPF) 117 /* Used for bridge_ip[6]_checkbasic */ 118 #include <netinet/in.h> 119 #include <netinet/in_systm.h> 120 #include <netinet/ip.h> 121 #include <netinet/ip_var.h> 122 #include <netinet/ip_private.h> /* XXX */ 123 124 #include <netinet/ip6.h> 125 #include <netinet6/in6_var.h> 126 #include <netinet6/ip6_var.h> 127 #include <netinet6/ip6_private.h> /* XXX */ 128 #endif /* BRIDGE_IPF */ 129 130 /* 131 * Size of the route hash table. Must be a power of two. 132 */ 133 #ifndef BRIDGE_RTHASH_SIZE 134 #define BRIDGE_RTHASH_SIZE 1024 135 #endif 136 137 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 138 139 #include "carp.h" 140 #if NCARP > 0 141 #include <netinet/in.h> 142 #include <netinet/in_var.h> 143 #include <netinet/ip_carp.h> 144 #endif 145 146 #include "ioconf.h" 147 148 __CTASSERT(sizeof(struct ifbifconf) == sizeof(struct ifbaconf)); 149 __CTASSERT(offsetof(struct ifbifconf, ifbic_len) == offsetof(struct ifbaconf, ifbac_len)); 150 __CTASSERT(offsetof(struct ifbifconf, ifbic_buf) == offsetof(struct ifbaconf, ifbac_buf)); 151 152 /* 153 * Maximum number of addresses to cache. 154 */ 155 #ifndef BRIDGE_RTABLE_MAX 156 #define BRIDGE_RTABLE_MAX 100 157 #endif 158 159 /* 160 * Spanning tree defaults. 161 */ 162 #define BSTP_DEFAULT_MAX_AGE (20 * 256) 163 #define BSTP_DEFAULT_HELLO_TIME (2 * 256) 164 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) 165 #define BSTP_DEFAULT_HOLD_TIME (1 * 256) 166 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 167 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 168 #define BSTP_DEFAULT_PATH_COST 55 169 170 /* 171 * Timeout (in seconds) for entries learned dynamically. 172 */ 173 #ifndef BRIDGE_RTABLE_TIMEOUT 174 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 175 #endif 176 177 /* 178 * Number of seconds between walks of the route list. 179 */ 180 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 181 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 182 #endif 183 184 #define BRIDGE_RT_LOCK(_sc) if ((_sc)->sc_rtlist_lock) \ 185 mutex_enter((_sc)->sc_rtlist_lock) 186 #define BRIDGE_RT_UNLOCK(_sc) if ((_sc)->sc_rtlist_lock) \ 187 mutex_exit((_sc)->sc_rtlist_lock) 188 #define BRIDGE_RT_LOCKED(_sc) (!(_sc)->sc_rtlist_lock || \ 189 mutex_owned((_sc)->sc_rtlist_lock)) 190 191 #define BRIDGE_RT_PSZ_PERFORM(_sc) \ 192 if ((_sc)->sc_rtlist_psz != NULL) \ 193 pserialize_perform((_sc)->sc_rtlist_psz); 194 195 #define BRIDGE_RT_RENTER(__s) do { __s = pserialize_read_enter(); } while (0) 196 #define BRIDGE_RT_REXIT(__s) do { pserialize_read_exit(__s); } while (0) 197 198 199 #ifdef NET_MPSAFE 200 #define DECLARE_LOCK_VARIABLE 201 #define ACQUIRE_GLOBAL_LOCKS() do { } while (0) 202 #define RELEASE_GLOBAL_LOCKS() do { } while (0) 203 #else 204 #define DECLARE_LOCK_VARIABLE int __s 205 #define ACQUIRE_GLOBAL_LOCKS() do { \ 206 KERNEL_LOCK(1, NULL); \ 207 mutex_enter(softnet_lock); \ 208 __s = splnet(); \ 209 } while (0) 210 #define RELEASE_GLOBAL_LOCKS() do { \ 211 splx(__s); \ 212 mutex_exit(softnet_lock); \ 213 KERNEL_UNLOCK_ONE(NULL); \ 214 } while (0) 215 #endif 216 217 struct psref_class *bridge_psref_class __read_mostly; 218 219 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 220 221 static struct pool bridge_rtnode_pool; 222 223 static int bridge_clone_create(struct if_clone *, int); 224 static int bridge_clone_destroy(struct ifnet *); 225 226 static int bridge_ioctl(struct ifnet *, u_long, void *); 227 static int bridge_init(struct ifnet *); 228 static void bridge_stop(struct ifnet *, int); 229 static void bridge_start(struct ifnet *); 230 231 static void bridge_input(struct ifnet *, struct mbuf *); 232 static void bridge_forward(struct bridge_softc *, struct mbuf *); 233 234 static void bridge_timer(void *); 235 236 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 237 struct mbuf *); 238 239 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 240 struct ifnet *, int, uint8_t); 241 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 242 static void bridge_rttrim(struct bridge_softc *); 243 static void bridge_rtage(struct bridge_softc *); 244 static void bridge_rtage_work(struct work *, void *); 245 static void bridge_rtflush(struct bridge_softc *, int); 246 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 247 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp); 248 249 static void bridge_rtable_init(struct bridge_softc *); 250 static void bridge_rtable_fini(struct bridge_softc *); 251 252 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 253 const uint8_t *); 254 static int bridge_rtnode_insert(struct bridge_softc *, 255 struct bridge_rtnode *); 256 static void bridge_rtnode_remove(struct bridge_softc *, 257 struct bridge_rtnode *); 258 static void bridge_rtnode_destroy(struct bridge_rtnode *); 259 260 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 261 const char *name, 262 struct psref *); 263 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 264 struct ifnet *ifp, 265 struct psref *); 266 static void bridge_release_member(struct bridge_softc *, struct bridge_iflist *, 267 struct psref *); 268 static void bridge_delete_member(struct bridge_softc *, 269 struct bridge_iflist *); 270 static void bridge_acquire_member(struct bridge_softc *sc, 271 struct bridge_iflist *, 272 struct psref *); 273 274 static int bridge_ioctl_add(struct bridge_softc *, void *); 275 static int bridge_ioctl_del(struct bridge_softc *, void *); 276 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 277 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 278 static int bridge_ioctl_scache(struct bridge_softc *, void *); 279 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 280 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 281 static int bridge_ioctl_rts(struct bridge_softc *, void *); 282 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 283 static int bridge_ioctl_sto(struct bridge_softc *, void *); 284 static int bridge_ioctl_gto(struct bridge_softc *, void *); 285 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 286 static int bridge_ioctl_flush(struct bridge_softc *, void *); 287 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 288 static int bridge_ioctl_spri(struct bridge_softc *, void *); 289 static int bridge_ioctl_ght(struct bridge_softc *, void *); 290 static int bridge_ioctl_sht(struct bridge_softc *, void *); 291 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 292 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 293 static int bridge_ioctl_gma(struct bridge_softc *, void *); 294 static int bridge_ioctl_sma(struct bridge_softc *, void *); 295 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 296 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 297 #if defined(BRIDGE_IPF) 298 static int bridge_ioctl_gfilt(struct bridge_softc *, void *); 299 static int bridge_ioctl_sfilt(struct bridge_softc *, void *); 300 static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int); 301 static int bridge_ip_checkbasic(struct mbuf **mp); 302 # ifdef INET6 303 static int bridge_ip6_checkbasic(struct mbuf **mp); 304 # endif /* INET6 */ 305 #endif /* BRIDGE_IPF */ 306 307 struct bridge_control { 308 int (*bc_func)(struct bridge_softc *, void *); 309 int bc_argsize; 310 int bc_flags; 311 }; 312 313 #define BC_F_COPYIN 0x01 /* copy arguments in */ 314 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 315 #define BC_F_SUSER 0x04 /* do super-user check */ 316 #define BC_F_XLATEIN 0x08 /* xlate arguments in */ 317 #define BC_F_XLATEOUT 0x10 /* xlate arguments out */ 318 319 static const struct bridge_control bridge_control_table[] = { 320 [BRDGADD] = {bridge_ioctl_add, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 321 [BRDGDEL] = {bridge_ioctl_del, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 322 323 [BRDGGIFFLGS] = {bridge_ioctl_gifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_COPYOUT}, 324 [BRDGSIFFLGS] = {bridge_ioctl_sifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 325 326 [BRDGSCACHE] = {bridge_ioctl_scache, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 327 [BRDGGCACHE] = {bridge_ioctl_gcache, sizeof(struct ifbrparam), BC_F_COPYOUT}, 328 329 [OBRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_COPYIN|BC_F_COPYOUT}, 330 [OBRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_COPYIN|BC_F_COPYOUT}, 331 332 [BRDGSADDR] = {bridge_ioctl_saddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 333 334 [BRDGSTO] = {bridge_ioctl_sto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 335 [BRDGGTO] = {bridge_ioctl_gto, sizeof(struct ifbrparam), BC_F_COPYOUT}, 336 337 [BRDGDADDR] = {bridge_ioctl_daddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 338 339 [BRDGFLUSH] = {bridge_ioctl_flush, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 340 341 [BRDGGPRI] = {bridge_ioctl_gpri, sizeof(struct ifbrparam), BC_F_COPYOUT}, 342 [BRDGSPRI] = {bridge_ioctl_spri, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 343 344 [BRDGGHT] = {bridge_ioctl_ght, sizeof(struct ifbrparam), BC_F_COPYOUT}, 345 [BRDGSHT] = {bridge_ioctl_sht, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 346 347 [BRDGGFD] = {bridge_ioctl_gfd, sizeof(struct ifbrparam), BC_F_COPYOUT}, 348 [BRDGSFD] = {bridge_ioctl_sfd, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 349 350 [BRDGGMA] = {bridge_ioctl_gma, sizeof(struct ifbrparam), BC_F_COPYOUT}, 351 [BRDGSMA] = {bridge_ioctl_sma, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 352 353 [BRDGSIFPRIO] = {bridge_ioctl_sifprio, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 354 355 [BRDGSIFCOST] = {bridge_ioctl_sifcost, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 356 #if defined(BRIDGE_IPF) 357 [BRDGGFILT] = {bridge_ioctl_gfilt, sizeof(struct ifbrparam), BC_F_COPYOUT}, 358 [BRDGSFILT] = {bridge_ioctl_sfilt, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 359 #endif /* BRIDGE_IPF */ 360 [BRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 361 [BRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 362 }; 363 364 static const int bridge_control_table_size = __arraycount(bridge_control_table); 365 366 static struct if_clone bridge_cloner = 367 IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy); 368 369 /* 370 * bridgeattach: 371 * 372 * Pseudo-device attach routine. 373 */ 374 void 375 bridgeattach(int n) 376 { 377 378 pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode), 379 0, 0, 0, "brtpl", NULL, IPL_NET); 380 381 bridge_psref_class = psref_class_create("bridge", IPL_SOFTNET); 382 383 if_clone_attach(&bridge_cloner); 384 } 385 386 /* 387 * bridge_clone_create: 388 * 389 * Create a new bridge instance. 390 */ 391 static int 392 bridge_clone_create(struct if_clone *ifc, int unit) 393 { 394 struct bridge_softc *sc; 395 struct ifnet *ifp; 396 int error; 397 398 sc = kmem_zalloc(sizeof(*sc), KM_SLEEP); 399 ifp = &sc->sc_if; 400 401 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 402 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 403 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 404 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 405 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 406 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 407 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 408 sc->sc_filter_flags = 0; 409 410 /* Initialize our routing table. */ 411 bridge_rtable_init(sc); 412 413 error = workqueue_create(&sc->sc_rtage_wq, "bridge_rtage", 414 bridge_rtage_work, sc, PRI_SOFTNET, IPL_SOFTNET, WQ_MPSAFE); 415 if (error) 416 panic("%s: workqueue_create %d\n", __func__, error); 417 418 callout_init(&sc->sc_brcallout, 0); 419 callout_init(&sc->sc_bstpcallout, 0); 420 421 mutex_init(&sc->sc_iflist_psref.bip_lock, MUTEX_DEFAULT, IPL_NONE); 422 PSLIST_INIT(&sc->sc_iflist_psref.bip_iflist); 423 sc->sc_iflist_psref.bip_psz = pserialize_create(); 424 425 if_initname(ifp, ifc->ifc_name, unit); 426 ifp->if_softc = sc; 427 ifp->if_mtu = ETHERMTU; 428 ifp->if_ioctl = bridge_ioctl; 429 ifp->if_output = bridge_output; 430 ifp->if_start = bridge_start; 431 ifp->if_stop = bridge_stop; 432 ifp->if_init = bridge_init; 433 ifp->if_type = IFT_BRIDGE; 434 ifp->if_addrlen = 0; 435 ifp->if_dlt = DLT_EN10MB; 436 ifp->if_hdrlen = ETHER_HDR_LEN; 437 438 if_initialize(ifp); 439 if_register(ifp); 440 441 if_alloc_sadl(ifp); 442 443 return (0); 444 } 445 446 /* 447 * bridge_clone_destroy: 448 * 449 * Destroy a bridge instance. 450 */ 451 static int 452 bridge_clone_destroy(struct ifnet *ifp) 453 { 454 struct bridge_softc *sc = ifp->if_softc; 455 struct bridge_iflist *bif; 456 int s; 457 458 s = splnet(); 459 460 bridge_stop(ifp, 1); 461 462 BRIDGE_LOCK(sc); 463 for (;;) { 464 bif = PSLIST_WRITER_FIRST(&sc->sc_iflist_psref.bip_iflist, struct bridge_iflist, 465 bif_next); 466 if (bif == NULL) 467 break; 468 bridge_delete_member(sc, bif); 469 } 470 PSLIST_DESTROY(&sc->sc_iflist_psref.bip_iflist); 471 BRIDGE_UNLOCK(sc); 472 473 splx(s); 474 475 if_detach(ifp); 476 477 /* Tear down the routing table. */ 478 bridge_rtable_fini(sc); 479 480 pserialize_destroy(sc->sc_iflist_psref.bip_psz); 481 mutex_destroy(&sc->sc_iflist_psref.bip_lock); 482 483 workqueue_destroy(sc->sc_rtage_wq); 484 485 kmem_free(sc, sizeof(*sc)); 486 487 return (0); 488 } 489 490 /* 491 * bridge_ioctl: 492 * 493 * Handle a control request from the operator. 494 */ 495 static int 496 bridge_ioctl(struct ifnet *ifp, u_long cmd, void *data) 497 { 498 struct bridge_softc *sc = ifp->if_softc; 499 struct lwp *l = curlwp; /* XXX */ 500 union { 501 struct ifbreq ifbreq; 502 struct ifbifconf ifbifconf; 503 struct ifbareq ifbareq; 504 struct ifbaconf ifbaconf; 505 struct ifbrparam ifbrparam; 506 } args; 507 struct ifdrv *ifd = (struct ifdrv *) data; 508 const struct bridge_control *bc = NULL; /* XXXGCC */ 509 int s, error = 0; 510 511 /* Authorize command before calling splnet(). */ 512 switch (cmd) { 513 case SIOCGDRVSPEC: 514 case SIOCSDRVSPEC: 515 if (ifd->ifd_cmd >= bridge_control_table_size 516 || (bc = &bridge_control_table[ifd->ifd_cmd]) == NULL) { 517 error = EINVAL; 518 return error; 519 } 520 521 /* We only care about BC_F_SUSER at this point. */ 522 if ((bc->bc_flags & BC_F_SUSER) == 0) 523 break; 524 525 error = kauth_authorize_network(l->l_cred, 526 KAUTH_NETWORK_INTERFACE_BRIDGE, 527 cmd == SIOCGDRVSPEC ? 528 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_GETPRIV : 529 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_SETPRIV, 530 ifd, NULL, NULL); 531 if (error) 532 return (error); 533 534 break; 535 } 536 537 s = splnet(); 538 539 switch (cmd) { 540 case SIOCGDRVSPEC: 541 case SIOCSDRVSPEC: 542 KASSERT(bc != NULL); 543 if (cmd == SIOCGDRVSPEC && 544 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) == 0) { 545 error = EINVAL; 546 break; 547 } 548 else if (cmd == SIOCSDRVSPEC && 549 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) != 0) { 550 error = EINVAL; 551 break; 552 } 553 554 /* BC_F_SUSER is checked above, before splnet(). */ 555 556 if ((bc->bc_flags & (BC_F_XLATEIN|BC_F_XLATEOUT)) == 0 557 && (ifd->ifd_len != bc->bc_argsize 558 || ifd->ifd_len > sizeof(args))) { 559 error = EINVAL; 560 break; 561 } 562 563 memset(&args, 0, sizeof(args)); 564 if (bc->bc_flags & BC_F_COPYIN) { 565 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 566 if (error) 567 break; 568 } else if (bc->bc_flags & BC_F_XLATEIN) { 569 args.ifbifconf.ifbic_len = ifd->ifd_len; 570 args.ifbifconf.ifbic_buf = ifd->ifd_data; 571 } 572 573 error = (*bc->bc_func)(sc, &args); 574 if (error) 575 break; 576 577 if (bc->bc_flags & BC_F_COPYOUT) { 578 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 579 } else if (bc->bc_flags & BC_F_XLATEOUT) { 580 ifd->ifd_len = args.ifbifconf.ifbic_len; 581 ifd->ifd_data = args.ifbifconf.ifbic_buf; 582 } 583 break; 584 585 case SIOCSIFFLAGS: 586 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 587 break; 588 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 589 case IFF_RUNNING: 590 /* 591 * If interface is marked down and it is running, 592 * then stop and disable it. 593 */ 594 (*ifp->if_stop)(ifp, 1); 595 break; 596 case IFF_UP: 597 /* 598 * If interface is marked up and it is stopped, then 599 * start it. 600 */ 601 error = (*ifp->if_init)(ifp); 602 break; 603 default: 604 break; 605 } 606 break; 607 608 case SIOCSIFMTU: 609 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 610 error = 0; 611 break; 612 613 default: 614 error = ifioctl_common(ifp, cmd, data); 615 break; 616 } 617 618 splx(s); 619 620 return (error); 621 } 622 623 /* 624 * bridge_lookup_member: 625 * 626 * Lookup a bridge member interface. 627 */ 628 static struct bridge_iflist * 629 bridge_lookup_member(struct bridge_softc *sc, const char *name, struct psref *psref) 630 { 631 struct bridge_iflist *bif; 632 struct ifnet *ifp; 633 int s; 634 635 BRIDGE_PSZ_RENTER(s); 636 637 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 638 ifp = bif->bif_ifp; 639 if (strcmp(ifp->if_xname, name) == 0) 640 break; 641 } 642 if (bif != NULL) 643 bridge_acquire_member(sc, bif, psref); 644 645 BRIDGE_PSZ_REXIT(s); 646 647 return bif; 648 } 649 650 /* 651 * bridge_lookup_member_if: 652 * 653 * Lookup a bridge member interface by ifnet*. 654 */ 655 static struct bridge_iflist * 656 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp, 657 struct psref *psref) 658 { 659 struct bridge_iflist *bif; 660 int s; 661 662 BRIDGE_PSZ_RENTER(s); 663 664 bif = member_ifp->if_bridgeif; 665 if (bif != NULL) { 666 psref_acquire(psref, &bif->bif_psref, 667 bridge_psref_class); 668 } 669 670 BRIDGE_PSZ_REXIT(s); 671 672 return bif; 673 } 674 675 static void 676 bridge_acquire_member(struct bridge_softc *sc, struct bridge_iflist *bif, 677 struct psref *psref) 678 { 679 680 psref_acquire(psref, &bif->bif_psref, bridge_psref_class); 681 } 682 683 /* 684 * bridge_release_member: 685 * 686 * Release the specified member interface. 687 */ 688 static void 689 bridge_release_member(struct bridge_softc *sc, struct bridge_iflist *bif, 690 struct psref *psref) 691 { 692 693 psref_release(psref, &bif->bif_psref, bridge_psref_class); 694 } 695 696 /* 697 * bridge_delete_member: 698 * 699 * Delete the specified member interface. 700 */ 701 static void 702 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 703 { 704 struct ifnet *ifs = bif->bif_ifp; 705 706 KASSERT(BRIDGE_LOCKED(sc)); 707 708 ifs->_if_input = ether_input; 709 ifs->if_bridge = NULL; 710 ifs->if_bridgeif = NULL; 711 712 PSLIST_WRITER_REMOVE(bif, bif_next); 713 BRIDGE_PSZ_PERFORM(sc); 714 BRIDGE_UNLOCK(sc); 715 716 psref_target_destroy(&bif->bif_psref, bridge_psref_class); 717 718 PSLIST_ENTRY_DESTROY(bif, bif_next); 719 kmem_free(bif, sizeof(*bif)); 720 721 BRIDGE_LOCK(sc); 722 } 723 724 static int 725 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 726 { 727 struct ifbreq *req = arg; 728 struct bridge_iflist *bif = NULL; 729 struct ifnet *ifs; 730 int error = 0; 731 732 ifs = ifunit(req->ifbr_ifsname); 733 if (ifs == NULL) 734 return (ENOENT); 735 736 if (sc->sc_if.if_mtu != ifs->if_mtu) 737 return (EINVAL); 738 739 if (ifs->if_bridge == sc) 740 return (EEXIST); 741 742 if (ifs->if_bridge != NULL) 743 return (EBUSY); 744 745 if (ifs->_if_input != ether_input) 746 return EINVAL; 747 748 /* FIXME: doesn't work with non-IFF_SIMPLEX interfaces */ 749 if ((ifs->if_flags & IFF_SIMPLEX) == 0) 750 return EINVAL; 751 752 bif = kmem_alloc(sizeof(*bif), KM_SLEEP); 753 754 switch (ifs->if_type) { 755 case IFT_ETHER: 756 if ((error = ether_enable_vlan_mtu(ifs)) > 0) 757 goto out; 758 /* 759 * Place the interface into promiscuous mode. 760 */ 761 error = ifpromisc(ifs, 1); 762 if (error) 763 goto out; 764 break; 765 default: 766 error = EINVAL; 767 goto out; 768 } 769 770 bif->bif_ifp = ifs; 771 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 772 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 773 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 774 PSLIST_ENTRY_INIT(bif, bif_next); 775 psref_target_init(&bif->bif_psref, bridge_psref_class); 776 777 BRIDGE_LOCK(sc); 778 779 ifs->if_bridge = sc; 780 ifs->if_bridgeif = bif; 781 PSLIST_WRITER_INSERT_HEAD(&sc->sc_iflist_psref.bip_iflist, bif, bif_next); 782 ifs->_if_input = bridge_input; 783 784 BRIDGE_UNLOCK(sc); 785 786 if (sc->sc_if.if_flags & IFF_RUNNING) 787 bstp_initialization(sc); 788 else 789 bstp_stop(sc); 790 791 out: 792 if (error) { 793 if (bif != NULL) 794 kmem_free(bif, sizeof(*bif)); 795 } 796 return (error); 797 } 798 799 static int 800 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 801 { 802 struct ifbreq *req = arg; 803 const char *name = req->ifbr_ifsname; 804 struct bridge_iflist *bif; 805 struct ifnet *ifs; 806 807 BRIDGE_LOCK(sc); 808 809 /* 810 * Don't use bridge_lookup_member. We want to get a member 811 * with bif_refs == 0. 812 */ 813 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 814 ifs = bif->bif_ifp; 815 if (strcmp(ifs->if_xname, name) == 0) 816 break; 817 } 818 819 if (bif == NULL) { 820 BRIDGE_UNLOCK(sc); 821 return ENOENT; 822 } 823 824 bridge_delete_member(sc, bif); 825 826 BRIDGE_UNLOCK(sc); 827 828 switch (ifs->if_type) { 829 case IFT_ETHER: 830 /* 831 * Take the interface out of promiscuous mode. 832 * Don't call it with holding a spin lock. 833 */ 834 (void) ifpromisc(ifs, 0); 835 (void) ether_disable_vlan_mtu(ifs); 836 break; 837 default: 838 #ifdef DIAGNOSTIC 839 panic("bridge_delete_member: impossible"); 840 #endif 841 break; 842 } 843 844 bridge_rtdelete(sc, ifs); 845 846 if (sc->sc_if.if_flags & IFF_RUNNING) 847 bstp_initialization(sc); 848 849 return 0; 850 } 851 852 static int 853 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 854 { 855 struct ifbreq *req = arg; 856 struct bridge_iflist *bif; 857 struct psref psref; 858 859 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 860 if (bif == NULL) 861 return (ENOENT); 862 863 req->ifbr_ifsflags = bif->bif_flags; 864 req->ifbr_state = bif->bif_state; 865 req->ifbr_priority = bif->bif_priority; 866 req->ifbr_path_cost = bif->bif_path_cost; 867 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 868 869 bridge_release_member(sc, bif, &psref); 870 871 return (0); 872 } 873 874 static int 875 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 876 { 877 struct ifbreq *req = arg; 878 struct bridge_iflist *bif; 879 struct psref psref; 880 881 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 882 if (bif == NULL) 883 return (ENOENT); 884 885 if (req->ifbr_ifsflags & IFBIF_STP) { 886 switch (bif->bif_ifp->if_type) { 887 case IFT_ETHER: 888 /* These can do spanning tree. */ 889 break; 890 891 default: 892 /* Nothing else can. */ 893 bridge_release_member(sc, bif, &psref); 894 return (EINVAL); 895 } 896 } 897 898 bif->bif_flags = req->ifbr_ifsflags; 899 900 bridge_release_member(sc, bif, &psref); 901 902 if (sc->sc_if.if_flags & IFF_RUNNING) 903 bstp_initialization(sc); 904 905 return (0); 906 } 907 908 static int 909 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 910 { 911 struct ifbrparam *param = arg; 912 913 sc->sc_brtmax = param->ifbrp_csize; 914 bridge_rttrim(sc); 915 916 return (0); 917 } 918 919 static int 920 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 921 { 922 struct ifbrparam *param = arg; 923 924 param->ifbrp_csize = sc->sc_brtmax; 925 926 return (0); 927 } 928 929 static int 930 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 931 { 932 struct ifbifconf *bifc = arg; 933 struct bridge_iflist *bif; 934 struct ifbreq *breqs; 935 int i, count, error = 0; 936 937 retry: 938 BRIDGE_LOCK(sc); 939 count = 0; 940 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 941 count++; 942 BRIDGE_UNLOCK(sc); 943 944 if (count == 0) { 945 bifc->ifbic_len = 0; 946 return 0; 947 } 948 949 if (bifc->ifbic_len == 0 || bifc->ifbic_len < (sizeof(*breqs) * count)) { 950 /* Tell that a larger buffer is needed */ 951 bifc->ifbic_len = sizeof(*breqs) * count; 952 return 0; 953 } 954 955 breqs = kmem_alloc(sizeof(*breqs) * count, KM_SLEEP); 956 957 BRIDGE_LOCK(sc); 958 959 i = 0; 960 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 961 i++; 962 if (i > count) { 963 /* 964 * The number of members has been increased. 965 * We need more memory! 966 */ 967 BRIDGE_UNLOCK(sc); 968 kmem_free(breqs, sizeof(*breqs) * count); 969 goto retry; 970 } 971 972 i = 0; 973 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 974 struct ifbreq *breq = &breqs[i++]; 975 memset(breq, 0, sizeof(*breq)); 976 977 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, 978 sizeof(breq->ifbr_ifsname)); 979 breq->ifbr_ifsflags = bif->bif_flags; 980 breq->ifbr_state = bif->bif_state; 981 breq->ifbr_priority = bif->bif_priority; 982 breq->ifbr_path_cost = bif->bif_path_cost; 983 breq->ifbr_portno = bif->bif_ifp->if_index & 0xff; 984 } 985 986 /* Don't call copyout with holding the mutex */ 987 BRIDGE_UNLOCK(sc); 988 989 for (i = 0; i < count; i++) { 990 error = copyout(&breqs[i], bifc->ifbic_req + i, sizeof(*breqs)); 991 if (error) 992 break; 993 } 994 bifc->ifbic_len = sizeof(*breqs) * i; 995 996 kmem_free(breqs, sizeof(*breqs) * count); 997 998 return error; 999 } 1000 1001 static int 1002 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1003 { 1004 struct ifbaconf *bac = arg; 1005 struct bridge_rtnode *brt; 1006 struct ifbareq bareq; 1007 int count = 0, error = 0, len; 1008 1009 if (bac->ifbac_len == 0) 1010 return (0); 1011 1012 BRIDGE_RT_LOCK(sc); 1013 1014 len = bac->ifbac_len; 1015 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1016 if (len < sizeof(bareq)) 1017 goto out; 1018 memset(&bareq, 0, sizeof(bareq)); 1019 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1020 sizeof(bareq.ifba_ifsname)); 1021 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1022 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1023 bareq.ifba_expire = brt->brt_expire - time_uptime; 1024 } else 1025 bareq.ifba_expire = 0; 1026 bareq.ifba_flags = brt->brt_flags; 1027 1028 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1029 if (error) 1030 goto out; 1031 count++; 1032 len -= sizeof(bareq); 1033 } 1034 out: 1035 BRIDGE_RT_UNLOCK(sc); 1036 1037 bac->ifbac_len = sizeof(bareq) * count; 1038 return (error); 1039 } 1040 1041 static int 1042 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1043 { 1044 struct ifbareq *req = arg; 1045 struct bridge_iflist *bif; 1046 int error; 1047 struct psref psref; 1048 1049 bif = bridge_lookup_member(sc, req->ifba_ifsname, &psref); 1050 if (bif == NULL) 1051 return (ENOENT); 1052 1053 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1054 req->ifba_flags); 1055 1056 bridge_release_member(sc, bif, &psref); 1057 1058 return (error); 1059 } 1060 1061 static int 1062 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1063 { 1064 struct ifbrparam *param = arg; 1065 1066 sc->sc_brttimeout = param->ifbrp_ctime; 1067 1068 return (0); 1069 } 1070 1071 static int 1072 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1073 { 1074 struct ifbrparam *param = arg; 1075 1076 param->ifbrp_ctime = sc->sc_brttimeout; 1077 1078 return (0); 1079 } 1080 1081 static int 1082 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1083 { 1084 struct ifbareq *req = arg; 1085 1086 return (bridge_rtdaddr(sc, req->ifba_dst)); 1087 } 1088 1089 static int 1090 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1091 { 1092 struct ifbreq *req = arg; 1093 1094 bridge_rtflush(sc, req->ifbr_ifsflags); 1095 1096 return (0); 1097 } 1098 1099 static int 1100 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1101 { 1102 struct ifbrparam *param = arg; 1103 1104 param->ifbrp_prio = sc->sc_bridge_priority; 1105 1106 return (0); 1107 } 1108 1109 static int 1110 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1111 { 1112 struct ifbrparam *param = arg; 1113 1114 sc->sc_bridge_priority = param->ifbrp_prio; 1115 1116 if (sc->sc_if.if_flags & IFF_RUNNING) 1117 bstp_initialization(sc); 1118 1119 return (0); 1120 } 1121 1122 static int 1123 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1124 { 1125 struct ifbrparam *param = arg; 1126 1127 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1128 1129 return (0); 1130 } 1131 1132 static int 1133 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1134 { 1135 struct ifbrparam *param = arg; 1136 1137 if (param->ifbrp_hellotime == 0) 1138 return (EINVAL); 1139 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1140 1141 if (sc->sc_if.if_flags & IFF_RUNNING) 1142 bstp_initialization(sc); 1143 1144 return (0); 1145 } 1146 1147 static int 1148 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1149 { 1150 struct ifbrparam *param = arg; 1151 1152 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1153 1154 return (0); 1155 } 1156 1157 static int 1158 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1159 { 1160 struct ifbrparam *param = arg; 1161 1162 if (param->ifbrp_fwddelay == 0) 1163 return (EINVAL); 1164 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1165 1166 if (sc->sc_if.if_flags & IFF_RUNNING) 1167 bstp_initialization(sc); 1168 1169 return (0); 1170 } 1171 1172 static int 1173 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1174 { 1175 struct ifbrparam *param = arg; 1176 1177 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1178 1179 return (0); 1180 } 1181 1182 static int 1183 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1184 { 1185 struct ifbrparam *param = arg; 1186 1187 if (param->ifbrp_maxage == 0) 1188 return (EINVAL); 1189 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1190 1191 if (sc->sc_if.if_flags & IFF_RUNNING) 1192 bstp_initialization(sc); 1193 1194 return (0); 1195 } 1196 1197 static int 1198 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1199 { 1200 struct ifbreq *req = arg; 1201 struct bridge_iflist *bif; 1202 struct psref psref; 1203 1204 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1205 if (bif == NULL) 1206 return (ENOENT); 1207 1208 bif->bif_priority = req->ifbr_priority; 1209 1210 if (sc->sc_if.if_flags & IFF_RUNNING) 1211 bstp_initialization(sc); 1212 1213 bridge_release_member(sc, bif, &psref); 1214 1215 return (0); 1216 } 1217 1218 #if defined(BRIDGE_IPF) 1219 static int 1220 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1221 { 1222 struct ifbrparam *param = arg; 1223 1224 param->ifbrp_filter = sc->sc_filter_flags; 1225 1226 return (0); 1227 } 1228 1229 static int 1230 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1231 { 1232 struct ifbrparam *param = arg; 1233 uint32_t nflags, oflags; 1234 1235 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1236 return (EINVAL); 1237 1238 nflags = param->ifbrp_filter; 1239 oflags = sc->sc_filter_flags; 1240 1241 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1242 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1243 sc->sc_if.if_pfil); 1244 } 1245 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1246 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1247 sc->sc_if.if_pfil); 1248 } 1249 1250 sc->sc_filter_flags = nflags; 1251 1252 return (0); 1253 } 1254 #endif /* BRIDGE_IPF */ 1255 1256 static int 1257 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1258 { 1259 struct ifbreq *req = arg; 1260 struct bridge_iflist *bif; 1261 struct psref psref; 1262 1263 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1264 if (bif == NULL) 1265 return (ENOENT); 1266 1267 bif->bif_path_cost = req->ifbr_path_cost; 1268 1269 if (sc->sc_if.if_flags & IFF_RUNNING) 1270 bstp_initialization(sc); 1271 1272 bridge_release_member(sc, bif, &psref); 1273 1274 return (0); 1275 } 1276 1277 /* 1278 * bridge_ifdetach: 1279 * 1280 * Detach an interface from a bridge. Called when a member 1281 * interface is detaching. 1282 */ 1283 void 1284 bridge_ifdetach(struct ifnet *ifp) 1285 { 1286 struct bridge_softc *sc = ifp->if_bridge; 1287 struct ifbreq breq; 1288 1289 /* ioctl_lock should prevent this from happening */ 1290 KASSERT(sc != NULL); 1291 1292 memset(&breq, 0, sizeof(breq)); 1293 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1294 1295 (void) bridge_ioctl_del(sc, &breq); 1296 } 1297 1298 /* 1299 * bridge_init: 1300 * 1301 * Initialize a bridge interface. 1302 */ 1303 static int 1304 bridge_init(struct ifnet *ifp) 1305 { 1306 struct bridge_softc *sc = ifp->if_softc; 1307 1308 if (ifp->if_flags & IFF_RUNNING) 1309 return (0); 1310 1311 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1312 bridge_timer, sc); 1313 1314 ifp->if_flags |= IFF_RUNNING; 1315 bstp_initialization(sc); 1316 return (0); 1317 } 1318 1319 /* 1320 * bridge_stop: 1321 * 1322 * Stop the bridge interface. 1323 */ 1324 static void 1325 bridge_stop(struct ifnet *ifp, int disable) 1326 { 1327 struct bridge_softc *sc = ifp->if_softc; 1328 1329 if ((ifp->if_flags & IFF_RUNNING) == 0) 1330 return; 1331 1332 callout_stop(&sc->sc_brcallout); 1333 bstp_stop(sc); 1334 1335 bridge_rtflush(sc, IFBF_FLUSHDYN); 1336 1337 ifp->if_flags &= ~IFF_RUNNING; 1338 } 1339 1340 /* 1341 * bridge_enqueue: 1342 * 1343 * Enqueue a packet on a bridge member interface. 1344 */ 1345 void 1346 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1347 int runfilt) 1348 { 1349 ALTQ_DECL(struct altq_pktattr pktattr;) 1350 int len, error; 1351 short mflags; 1352 1353 /* 1354 * Clear any in-bound checksum flags for this packet. 1355 */ 1356 m->m_pkthdr.csum_flags = 0; 1357 1358 if (runfilt) { 1359 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1360 dst_ifp, PFIL_OUT) != 0) { 1361 if (m != NULL) 1362 m_freem(m); 1363 return; 1364 } 1365 if (m == NULL) 1366 return; 1367 } 1368 1369 #ifdef ALTQ 1370 /* 1371 * If ALTQ is enabled on the member interface, do 1372 * classification; the queueing discipline might 1373 * not require classification, but might require 1374 * the address family/header pointer in the pktattr. 1375 */ 1376 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1377 /* XXX IFT_ETHER */ 1378 altq_etherclassify(&dst_ifp->if_snd, m, &pktattr); 1379 } 1380 #endif /* ALTQ */ 1381 1382 len = m->m_pkthdr.len; 1383 mflags = m->m_flags; 1384 1385 IFQ_ENQUEUE(&dst_ifp->if_snd, m, &pktattr, error); 1386 1387 if (error) { 1388 /* mbuf is already freed */ 1389 sc->sc_if.if_oerrors++; 1390 return; 1391 } 1392 1393 sc->sc_if.if_opackets++; 1394 sc->sc_if.if_obytes += len; 1395 1396 dst_ifp->if_obytes += len; 1397 1398 if (mflags & M_MCAST) { 1399 sc->sc_if.if_omcasts++; 1400 dst_ifp->if_omcasts++; 1401 } 1402 1403 if ((dst_ifp->if_flags & IFF_OACTIVE) == 0) 1404 (*dst_ifp->if_start)(dst_ifp); 1405 } 1406 1407 /* 1408 * bridge_output: 1409 * 1410 * Send output from a bridge member interface. This 1411 * performs the bridging function for locally originated 1412 * packets. 1413 * 1414 * The mbuf has the Ethernet header already attached. We must 1415 * enqueue or free the mbuf before returning. 1416 */ 1417 int 1418 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1419 struct rtentry *rt) 1420 { 1421 struct ether_header *eh; 1422 struct ifnet *dst_if; 1423 struct bridge_softc *sc; 1424 int s; 1425 1426 if (m->m_len < ETHER_HDR_LEN) { 1427 m = m_pullup(m, ETHER_HDR_LEN); 1428 if (m == NULL) 1429 return (0); 1430 } 1431 1432 eh = mtod(m, struct ether_header *); 1433 sc = ifp->if_bridge; 1434 1435 /* 1436 * If bridge is down, but the original output interface is up, 1437 * go ahead and send out that interface. Otherwise, the packet 1438 * is dropped below. 1439 */ 1440 if (__predict_false(sc == NULL) || 1441 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1442 dst_if = ifp; 1443 goto sendunicast; 1444 } 1445 1446 /* 1447 * If the packet is a multicast, or we don't know a better way to 1448 * get there, send to all interfaces. 1449 */ 1450 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1451 dst_if = NULL; 1452 else 1453 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1454 if (dst_if == NULL) { 1455 struct bridge_iflist *bif; 1456 struct mbuf *mc; 1457 int used = 0; 1458 1459 BRIDGE_PSZ_RENTER(s); 1460 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1461 struct psref psref; 1462 1463 bridge_acquire_member(sc, bif, &psref); 1464 BRIDGE_PSZ_REXIT(s); 1465 1466 dst_if = bif->bif_ifp; 1467 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1468 goto next; 1469 1470 /* 1471 * If this is not the original output interface, 1472 * and the interface is participating in spanning 1473 * tree, make sure the port is in a state that 1474 * allows forwarding. 1475 */ 1476 if (dst_if != ifp && 1477 (bif->bif_flags & IFBIF_STP) != 0) { 1478 switch (bif->bif_state) { 1479 case BSTP_IFSTATE_BLOCKING: 1480 case BSTP_IFSTATE_LISTENING: 1481 case BSTP_IFSTATE_DISABLED: 1482 goto next; 1483 } 1484 } 1485 1486 if (PSLIST_READER_NEXT(bif, struct bridge_iflist, 1487 bif_next) == NULL) { 1488 used = 1; 1489 mc = m; 1490 } else { 1491 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1492 if (mc == NULL) { 1493 sc->sc_if.if_oerrors++; 1494 goto next; 1495 } 1496 } 1497 1498 #ifndef NET_MPSAFE 1499 s = splnet(); 1500 #endif 1501 bridge_enqueue(sc, dst_if, mc, 0); 1502 #ifndef NET_MPSAFE 1503 splx(s); 1504 #endif 1505 next: 1506 BRIDGE_PSZ_RENTER(s); 1507 bridge_release_member(sc, bif, &psref); 1508 } 1509 BRIDGE_PSZ_REXIT(s); 1510 1511 if (used == 0) 1512 m_freem(m); 1513 return (0); 1514 } 1515 1516 sendunicast: 1517 /* 1518 * XXX Spanning tree consideration here? 1519 */ 1520 1521 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1522 m_freem(m); 1523 return (0); 1524 } 1525 1526 #ifndef NET_MPSAFE 1527 s = splnet(); 1528 #endif 1529 bridge_enqueue(sc, dst_if, m, 0); 1530 #ifndef NET_MPSAFE 1531 splx(s); 1532 #endif 1533 1534 return (0); 1535 } 1536 1537 /* 1538 * bridge_start: 1539 * 1540 * Start output on a bridge. 1541 * 1542 * NOTE: This routine should never be called in this implementation. 1543 */ 1544 static void 1545 bridge_start(struct ifnet *ifp) 1546 { 1547 1548 printf("%s: bridge_start() called\n", ifp->if_xname); 1549 } 1550 1551 /* 1552 * bridge_forward: 1553 * 1554 * The forwarding function of the bridge. 1555 */ 1556 static void 1557 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1558 { 1559 struct bridge_iflist *bif; 1560 struct ifnet *src_if, *dst_if; 1561 struct ether_header *eh; 1562 struct psref psref; 1563 DECLARE_LOCK_VARIABLE; 1564 1565 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1566 return; 1567 1568 src_if = m->m_pkthdr.rcvif; 1569 1570 sc->sc_if.if_ipackets++; 1571 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1572 1573 /* 1574 * Look up the bridge_iflist. 1575 */ 1576 bif = bridge_lookup_member_if(sc, src_if, &psref); 1577 if (bif == NULL) { 1578 /* Interface is not a bridge member (anymore?) */ 1579 m_freem(m); 1580 goto out; 1581 } 1582 1583 if (bif->bif_flags & IFBIF_STP) { 1584 switch (bif->bif_state) { 1585 case BSTP_IFSTATE_BLOCKING: 1586 case BSTP_IFSTATE_LISTENING: 1587 case BSTP_IFSTATE_DISABLED: 1588 m_freem(m); 1589 bridge_release_member(sc, bif, &psref); 1590 goto out; 1591 } 1592 } 1593 1594 eh = mtod(m, struct ether_header *); 1595 1596 /* 1597 * If the interface is learning, and the source 1598 * address is valid and not multicast, record 1599 * the address. 1600 */ 1601 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1602 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1603 (eh->ether_shost[0] == 0 && 1604 eh->ether_shost[1] == 0 && 1605 eh->ether_shost[2] == 0 && 1606 eh->ether_shost[3] == 0 && 1607 eh->ether_shost[4] == 0 && 1608 eh->ether_shost[5] == 0) == 0) { 1609 (void) bridge_rtupdate(sc, eh->ether_shost, 1610 src_if, 0, IFBAF_DYNAMIC); 1611 } 1612 1613 if ((bif->bif_flags & IFBIF_STP) != 0 && 1614 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1615 m_freem(m); 1616 bridge_release_member(sc, bif, &psref); 1617 goto out; 1618 } 1619 1620 bridge_release_member(sc, bif, &psref); 1621 1622 /* 1623 * At this point, the port either doesn't participate 1624 * in spanning tree or it is in the forwarding state. 1625 */ 1626 1627 /* 1628 * If the packet is unicast, destined for someone on 1629 * "this" side of the bridge, drop it. 1630 */ 1631 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1632 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1633 if (src_if == dst_if) { 1634 m_freem(m); 1635 goto out; 1636 } 1637 } else { 1638 /* ...forward it to all interfaces. */ 1639 sc->sc_if.if_imcasts++; 1640 dst_if = NULL; 1641 } 1642 1643 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1644 m->m_pkthdr.rcvif, PFIL_IN) != 0) { 1645 if (m != NULL) 1646 m_freem(m); 1647 goto out; 1648 } 1649 if (m == NULL) 1650 goto out; 1651 1652 if (dst_if == NULL) { 1653 bridge_broadcast(sc, src_if, m); 1654 goto out; 1655 } 1656 1657 /* 1658 * At this point, we're dealing with a unicast frame 1659 * going to a different interface. 1660 */ 1661 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1662 m_freem(m); 1663 goto out; 1664 } 1665 1666 bif = bridge_lookup_member_if(sc, dst_if, &psref); 1667 if (bif == NULL) { 1668 /* Not a member of the bridge (anymore?) */ 1669 m_freem(m); 1670 goto out; 1671 } 1672 1673 if (bif->bif_flags & IFBIF_STP) { 1674 switch (bif->bif_state) { 1675 case BSTP_IFSTATE_DISABLED: 1676 case BSTP_IFSTATE_BLOCKING: 1677 m_freem(m); 1678 bridge_release_member(sc, bif, &psref); 1679 goto out; 1680 } 1681 } 1682 1683 bridge_release_member(sc, bif, &psref); 1684 1685 ACQUIRE_GLOBAL_LOCKS(); 1686 bridge_enqueue(sc, dst_if, m, 1); 1687 RELEASE_GLOBAL_LOCKS(); 1688 out: 1689 /* XXX gcc */ 1690 return; 1691 } 1692 1693 static bool 1694 bstp_state_before_learning(struct bridge_iflist *bif) 1695 { 1696 if (bif->bif_flags & IFBIF_STP) { 1697 switch (bif->bif_state) { 1698 case BSTP_IFSTATE_BLOCKING: 1699 case BSTP_IFSTATE_LISTENING: 1700 case BSTP_IFSTATE_DISABLED: 1701 return true; 1702 } 1703 } 1704 return false; 1705 } 1706 1707 static bool 1708 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1709 { 1710 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1711 1712 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1713 #if NCARP > 0 1714 || (bif->bif_ifp->if_carp && 1715 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1716 #endif /* NCARP > 0 */ 1717 ) 1718 return true; 1719 1720 return false; 1721 } 1722 1723 /* 1724 * bridge_input: 1725 * 1726 * Receive input from a member interface. Queue the packet for 1727 * bridging if it is not for us. 1728 */ 1729 static void 1730 bridge_input(struct ifnet *ifp, struct mbuf *m) 1731 { 1732 struct bridge_softc *sc = ifp->if_bridge; 1733 struct bridge_iflist *bif; 1734 struct ether_header *eh; 1735 struct psref psref; 1736 DECLARE_LOCK_VARIABLE; 1737 1738 KASSERT(!cpu_intr_p()); 1739 1740 if (__predict_false(sc == NULL) || 1741 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1742 ACQUIRE_GLOBAL_LOCKS(); 1743 ether_input(ifp, m); 1744 RELEASE_GLOBAL_LOCKS(); 1745 return; 1746 } 1747 1748 bif = bridge_lookup_member_if(sc, ifp, &psref); 1749 if (bif == NULL) { 1750 ACQUIRE_GLOBAL_LOCKS(); 1751 ether_input(ifp, m); 1752 RELEASE_GLOBAL_LOCKS(); 1753 return; 1754 } 1755 1756 eh = mtod(m, struct ether_header *); 1757 1758 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1759 if (memcmp(etherbroadcastaddr, 1760 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1761 m->m_flags |= M_BCAST; 1762 else 1763 m->m_flags |= M_MCAST; 1764 } 1765 1766 /* 1767 * A 'fast' path for packets addressed to interfaces that are 1768 * part of this bridge. 1769 */ 1770 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 1771 !bstp_state_before_learning(bif)) { 1772 struct bridge_iflist *_bif; 1773 struct ifnet *_ifp = NULL; 1774 int s; 1775 struct psref _psref; 1776 1777 BRIDGE_PSZ_RENTER(s); 1778 BRIDGE_IFLIST_READER_FOREACH(_bif, sc) { 1779 /* It is destined for us. */ 1780 if (bridge_ourether(_bif, eh, 0)) { 1781 bridge_acquire_member(sc, _bif, &_psref); 1782 BRIDGE_PSZ_REXIT(s); 1783 if (_bif == NULL) 1784 goto out; 1785 if (_bif->bif_flags & IFBIF_LEARNING) 1786 (void) bridge_rtupdate(sc, 1787 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1788 _ifp = m->m_pkthdr.rcvif = _bif->bif_ifp; 1789 bridge_release_member(sc, _bif, &_psref); 1790 goto out; 1791 } 1792 1793 /* We just received a packet that we sent out. */ 1794 if (bridge_ourether(_bif, eh, 1)) 1795 break; 1796 } 1797 BRIDGE_PSZ_REXIT(s); 1798 out: 1799 1800 if (_bif != NULL) { 1801 bridge_release_member(sc, bif, &psref); 1802 if (_ifp != NULL) { 1803 m->m_flags &= ~M_PROMISC; 1804 ACQUIRE_GLOBAL_LOCKS(); 1805 ether_input(_ifp, m); 1806 RELEASE_GLOBAL_LOCKS(); 1807 } else 1808 m_freem(m); 1809 return; 1810 } 1811 } 1812 1813 /* Tap off 802.1D packets; they do not get forwarded. */ 1814 if (bif->bif_flags & IFBIF_STP && 1815 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 1816 bstp_input(sc, bif, m); 1817 bridge_release_member(sc, bif, &psref); 1818 return; 1819 } 1820 1821 /* 1822 * A normal switch would discard the packet here, but that's not what 1823 * we've done historically. This also prevents some obnoxious behaviour. 1824 */ 1825 if (bstp_state_before_learning(bif)) { 1826 bridge_release_member(sc, bif, &psref); 1827 ACQUIRE_GLOBAL_LOCKS(); 1828 ether_input(ifp, m); 1829 RELEASE_GLOBAL_LOCKS(); 1830 return; 1831 } 1832 1833 bridge_release_member(sc, bif, &psref); 1834 1835 bridge_forward(sc, m); 1836 } 1837 1838 /* 1839 * bridge_broadcast: 1840 * 1841 * Send a frame to all interfaces that are members of 1842 * the bridge, except for the one on which the packet 1843 * arrived. 1844 */ 1845 static void 1846 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1847 struct mbuf *m) 1848 { 1849 struct bridge_iflist *bif; 1850 struct mbuf *mc; 1851 struct ifnet *dst_if; 1852 bool bmcast; 1853 int s; 1854 DECLARE_LOCK_VARIABLE; 1855 1856 bmcast = m->m_flags & (M_BCAST|M_MCAST); 1857 1858 BRIDGE_PSZ_RENTER(s); 1859 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1860 struct psref psref; 1861 1862 bridge_acquire_member(sc, bif, &psref); 1863 BRIDGE_PSZ_REXIT(s); 1864 1865 dst_if = bif->bif_ifp; 1866 1867 if (bif->bif_flags & IFBIF_STP) { 1868 switch (bif->bif_state) { 1869 case BSTP_IFSTATE_BLOCKING: 1870 case BSTP_IFSTATE_DISABLED: 1871 goto next; 1872 } 1873 } 1874 1875 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 1876 goto next; 1877 1878 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1879 goto next; 1880 1881 if (dst_if != src_if) { 1882 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1883 if (mc == NULL) { 1884 sc->sc_if.if_oerrors++; 1885 goto next; 1886 } 1887 ACQUIRE_GLOBAL_LOCKS(); 1888 bridge_enqueue(sc, dst_if, mc, 1); 1889 RELEASE_GLOBAL_LOCKS(); 1890 } 1891 1892 if (bmcast) { 1893 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1894 if (mc == NULL) { 1895 sc->sc_if.if_oerrors++; 1896 goto next; 1897 } 1898 1899 mc->m_pkthdr.rcvif = dst_if; 1900 mc->m_flags &= ~M_PROMISC; 1901 1902 ACQUIRE_GLOBAL_LOCKS(); 1903 ether_input(dst_if, mc); 1904 RELEASE_GLOBAL_LOCKS(); 1905 } 1906 next: 1907 BRIDGE_PSZ_RENTER(s); 1908 bridge_release_member(sc, bif, &psref); 1909 } 1910 BRIDGE_PSZ_REXIT(s); 1911 1912 m_freem(m); 1913 } 1914 1915 static int 1916 bridge_rtalloc(struct bridge_softc *sc, const uint8_t *dst, 1917 struct bridge_rtnode **brtp) 1918 { 1919 struct bridge_rtnode *brt; 1920 int error; 1921 1922 if (sc->sc_brtcnt >= sc->sc_brtmax) 1923 return ENOSPC; 1924 1925 /* 1926 * Allocate a new bridge forwarding node, and 1927 * initialize the expiration time and Ethernet 1928 * address. 1929 */ 1930 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 1931 if (brt == NULL) 1932 return ENOMEM; 1933 1934 memset(brt, 0, sizeof(*brt)); 1935 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1936 brt->brt_flags = IFBAF_DYNAMIC; 1937 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 1938 1939 BRIDGE_RT_LOCK(sc); 1940 error = bridge_rtnode_insert(sc, brt); 1941 BRIDGE_RT_UNLOCK(sc); 1942 1943 if (error != 0) { 1944 pool_put(&bridge_rtnode_pool, brt); 1945 return error; 1946 } 1947 1948 *brtp = brt; 1949 return 0; 1950 } 1951 1952 /* 1953 * bridge_rtupdate: 1954 * 1955 * Add a bridge routing entry. 1956 */ 1957 static int 1958 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 1959 struct ifnet *dst_if, int setflags, uint8_t flags) 1960 { 1961 struct bridge_rtnode *brt; 1962 int s; 1963 1964 again: 1965 /* 1966 * A route for this destination might already exist. If so, 1967 * update it, otherwise create a new one. 1968 */ 1969 BRIDGE_RT_RENTER(s); 1970 brt = bridge_rtnode_lookup(sc, dst); 1971 1972 if (brt != NULL) { 1973 brt->brt_ifp = dst_if; 1974 if (setflags) { 1975 brt->brt_flags = flags; 1976 if (flags & IFBAF_STATIC) 1977 brt->brt_expire = 0; 1978 else 1979 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1980 } else { 1981 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 1982 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1983 } 1984 } 1985 BRIDGE_RT_REXIT(s); 1986 1987 if (brt == NULL) { 1988 int r; 1989 1990 r = bridge_rtalloc(sc, dst, &brt); 1991 if (r != 0) 1992 return r; 1993 goto again; 1994 } 1995 1996 return 0; 1997 } 1998 1999 /* 2000 * bridge_rtlookup: 2001 * 2002 * Lookup the destination interface for an address. 2003 */ 2004 static struct ifnet * 2005 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2006 { 2007 struct bridge_rtnode *brt; 2008 struct ifnet *ifs = NULL; 2009 int s; 2010 2011 BRIDGE_RT_RENTER(s); 2012 brt = bridge_rtnode_lookup(sc, addr); 2013 if (brt != NULL) 2014 ifs = brt->brt_ifp; 2015 BRIDGE_RT_REXIT(s); 2016 2017 return ifs; 2018 } 2019 2020 typedef bool (*bridge_iterate_cb_t) 2021 (struct bridge_softc *, struct bridge_rtnode *, bool *, void *); 2022 2023 /* 2024 * bridge_rtlist_iterate_remove: 2025 * 2026 * It iterates on sc->sc_rtlist and removes rtnodes of it which func 2027 * callback judges to remove. Removals of rtnodes are done in a manner 2028 * of pserialize. To this end, all kmem_* operations are placed out of 2029 * mutexes. 2030 */ 2031 static void 2032 bridge_rtlist_iterate_remove(struct bridge_softc *sc, bridge_iterate_cb_t func, void *arg) 2033 { 2034 struct bridge_rtnode *brt, *nbrt; 2035 struct bridge_rtnode **brt_list; 2036 int i, count; 2037 2038 retry: 2039 count = sc->sc_brtcnt; 2040 if (count == 0) 2041 return; 2042 brt_list = kmem_alloc(sizeof(*brt_list) * count, KM_SLEEP); 2043 2044 BRIDGE_RT_LOCK(sc); 2045 if (__predict_false(sc->sc_brtcnt > count)) { 2046 /* The rtnodes increased, we need more memory */ 2047 BRIDGE_RT_UNLOCK(sc); 2048 kmem_free(brt_list, sizeof(*brt_list) * count); 2049 goto retry; 2050 } 2051 2052 i = 0; 2053 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2054 bool need_break = false; 2055 if (func(sc, brt, &need_break, arg)) { 2056 bridge_rtnode_remove(sc, brt); 2057 brt_list[i++] = brt; 2058 } 2059 if (need_break) 2060 break; 2061 } 2062 2063 if (i > 0) 2064 BRIDGE_RT_PSZ_PERFORM(sc); 2065 BRIDGE_RT_UNLOCK(sc); 2066 2067 while (--i >= 0) 2068 bridge_rtnode_destroy(brt_list[i]); 2069 2070 kmem_free(brt_list, sizeof(*brt_list) * count); 2071 } 2072 2073 static bool 2074 bridge_rttrim0_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2075 bool *need_break, void *arg) 2076 { 2077 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2078 /* Take into account of the subsequent removal */ 2079 if ((sc->sc_brtcnt - 1) <= sc->sc_brtmax) 2080 *need_break = true; 2081 return true; 2082 } else 2083 return false; 2084 } 2085 2086 static void 2087 bridge_rttrim0(struct bridge_softc *sc) 2088 { 2089 bridge_rtlist_iterate_remove(sc, bridge_rttrim0_cb, NULL); 2090 } 2091 2092 /* 2093 * bridge_rttrim: 2094 * 2095 * Trim the routine table so that we have a number 2096 * of routing entries less than or equal to the 2097 * maximum number. 2098 */ 2099 static void 2100 bridge_rttrim(struct bridge_softc *sc) 2101 { 2102 2103 /* Make sure we actually need to do this. */ 2104 if (sc->sc_brtcnt <= sc->sc_brtmax) 2105 return; 2106 2107 /* Force an aging cycle; this might trim enough addresses. */ 2108 bridge_rtage(sc); 2109 if (sc->sc_brtcnt <= sc->sc_brtmax) 2110 return; 2111 2112 bridge_rttrim0(sc); 2113 2114 return; 2115 } 2116 2117 /* 2118 * bridge_timer: 2119 * 2120 * Aging timer for the bridge. 2121 */ 2122 static void 2123 bridge_timer(void *arg) 2124 { 2125 struct bridge_softc *sc = arg; 2126 2127 workqueue_enqueue(sc->sc_rtage_wq, &sc->sc_rtage_wk, NULL); 2128 } 2129 2130 static void 2131 bridge_rtage_work(struct work *wk, void *arg) 2132 { 2133 struct bridge_softc *sc = arg; 2134 2135 KASSERT(wk == &sc->sc_rtage_wk); 2136 2137 bridge_rtage(sc); 2138 2139 if (sc->sc_if.if_flags & IFF_RUNNING) 2140 callout_reset(&sc->sc_brcallout, 2141 bridge_rtable_prune_period * hz, bridge_timer, sc); 2142 } 2143 2144 static bool 2145 bridge_rtage_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2146 bool *need_break, void *arg) 2147 { 2148 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2149 time_uptime >= brt->brt_expire) 2150 return true; 2151 else 2152 return false; 2153 } 2154 2155 /* 2156 * bridge_rtage: 2157 * 2158 * Perform an aging cycle. 2159 */ 2160 static void 2161 bridge_rtage(struct bridge_softc *sc) 2162 { 2163 bridge_rtlist_iterate_remove(sc, bridge_rtage_cb, NULL); 2164 } 2165 2166 2167 static bool 2168 bridge_rtflush_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2169 bool *need_break, void *arg) 2170 { 2171 int full = *(int*)arg; 2172 2173 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2174 return true; 2175 else 2176 return false; 2177 } 2178 2179 /* 2180 * bridge_rtflush: 2181 * 2182 * Remove all dynamic addresses from the bridge. 2183 */ 2184 static void 2185 bridge_rtflush(struct bridge_softc *sc, int full) 2186 { 2187 bridge_rtlist_iterate_remove(sc, bridge_rtflush_cb, &full); 2188 } 2189 2190 /* 2191 * bridge_rtdaddr: 2192 * 2193 * Remove an address from the table. 2194 */ 2195 static int 2196 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2197 { 2198 struct bridge_rtnode *brt; 2199 2200 BRIDGE_RT_LOCK(sc); 2201 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2202 BRIDGE_RT_UNLOCK(sc); 2203 return ENOENT; 2204 } 2205 bridge_rtnode_remove(sc, brt); 2206 BRIDGE_RT_PSZ_PERFORM(sc); 2207 BRIDGE_RT_UNLOCK(sc); 2208 2209 bridge_rtnode_destroy(brt); 2210 2211 return 0; 2212 } 2213 2214 /* 2215 * bridge_rtdelete: 2216 * 2217 * Delete routes to a speicifc member interface. 2218 */ 2219 static void 2220 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2221 { 2222 struct bridge_rtnode *brt; 2223 2224 BRIDGE_RT_LOCK(sc); 2225 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2226 if (brt->brt_ifp == ifp) 2227 break; 2228 } 2229 if (brt == NULL) { 2230 BRIDGE_RT_UNLOCK(sc); 2231 return; 2232 } 2233 bridge_rtnode_remove(sc, brt); 2234 BRIDGE_RT_PSZ_PERFORM(sc); 2235 BRIDGE_RT_UNLOCK(sc); 2236 2237 bridge_rtnode_destroy(brt); 2238 } 2239 2240 /* 2241 * bridge_rtable_init: 2242 * 2243 * Initialize the route table for this bridge. 2244 */ 2245 static void 2246 bridge_rtable_init(struct bridge_softc *sc) 2247 { 2248 int i; 2249 2250 sc->sc_rthash = kmem_alloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2251 KM_SLEEP); 2252 2253 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2254 LIST_INIT(&sc->sc_rthash[i]); 2255 2256 sc->sc_rthash_key = cprng_fast32(); 2257 2258 LIST_INIT(&sc->sc_rtlist); 2259 2260 sc->sc_rtlist_psz = pserialize_create(); 2261 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 2262 } 2263 2264 /* 2265 * bridge_rtable_fini: 2266 * 2267 * Deconstruct the route table for this bridge. 2268 */ 2269 static void 2270 bridge_rtable_fini(struct bridge_softc *sc) 2271 { 2272 2273 kmem_free(sc->sc_rthash, sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE); 2274 if (sc->sc_rtlist_lock) 2275 mutex_obj_free(sc->sc_rtlist_lock); 2276 if (sc->sc_rtlist_psz) 2277 pserialize_destroy(sc->sc_rtlist_psz); 2278 } 2279 2280 /* 2281 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2282 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2283 */ 2284 #define mix(a, b, c) \ 2285 do { \ 2286 a -= b; a -= c; a ^= (c >> 13); \ 2287 b -= c; b -= a; b ^= (a << 8); \ 2288 c -= a; c -= b; c ^= (b >> 13); \ 2289 a -= b; a -= c; a ^= (c >> 12); \ 2290 b -= c; b -= a; b ^= (a << 16); \ 2291 c -= a; c -= b; c ^= (b >> 5); \ 2292 a -= b; a -= c; a ^= (c >> 3); \ 2293 b -= c; b -= a; b ^= (a << 10); \ 2294 c -= a; c -= b; c ^= (b >> 15); \ 2295 } while (/*CONSTCOND*/0) 2296 2297 static inline uint32_t 2298 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2299 { 2300 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2301 2302 b += addr[5] << 8; 2303 b += addr[4]; 2304 a += addr[3] << 24; 2305 a += addr[2] << 16; 2306 a += addr[1] << 8; 2307 a += addr[0]; 2308 2309 mix(a, b, c); 2310 2311 return (c & BRIDGE_RTHASH_MASK); 2312 } 2313 2314 #undef mix 2315 2316 /* 2317 * bridge_rtnode_lookup: 2318 * 2319 * Look up a bridge route node for the specified destination. 2320 */ 2321 static struct bridge_rtnode * 2322 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2323 { 2324 struct bridge_rtnode *brt; 2325 uint32_t hash; 2326 int dir; 2327 2328 hash = bridge_rthash(sc, addr); 2329 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2330 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2331 if (dir == 0) 2332 return (brt); 2333 if (dir > 0) 2334 return (NULL); 2335 } 2336 2337 return (NULL); 2338 } 2339 2340 /* 2341 * bridge_rtnode_insert: 2342 * 2343 * Insert the specified bridge node into the route table. We 2344 * assume the entry is not already in the table. 2345 */ 2346 static int 2347 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2348 { 2349 struct bridge_rtnode *lbrt; 2350 uint32_t hash; 2351 int dir; 2352 2353 KASSERT(BRIDGE_RT_LOCKED(sc)); 2354 2355 hash = bridge_rthash(sc, brt->brt_addr); 2356 2357 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2358 if (lbrt == NULL) { 2359 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2360 goto out; 2361 } 2362 2363 do { 2364 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2365 if (dir == 0) 2366 return (EEXIST); 2367 if (dir > 0) { 2368 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2369 goto out; 2370 } 2371 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2372 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2373 goto out; 2374 } 2375 lbrt = LIST_NEXT(lbrt, brt_hash); 2376 } while (lbrt != NULL); 2377 2378 #ifdef DIAGNOSTIC 2379 panic("bridge_rtnode_insert: impossible"); 2380 #endif 2381 2382 out: 2383 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2384 sc->sc_brtcnt++; 2385 2386 return (0); 2387 } 2388 2389 /* 2390 * bridge_rtnode_remove: 2391 * 2392 * Remove a bridge rtnode from the rthash and the rtlist of a bridge. 2393 */ 2394 static void 2395 bridge_rtnode_remove(struct bridge_softc *sc, struct bridge_rtnode *brt) 2396 { 2397 2398 KASSERT(BRIDGE_RT_LOCKED(sc)); 2399 2400 LIST_REMOVE(brt, brt_hash); 2401 LIST_REMOVE(brt, brt_list); 2402 sc->sc_brtcnt--; 2403 } 2404 2405 /* 2406 * bridge_rtnode_destroy: 2407 * 2408 * Destroy a bridge rtnode. 2409 */ 2410 static void 2411 bridge_rtnode_destroy(struct bridge_rtnode *brt) 2412 { 2413 2414 pool_put(&bridge_rtnode_pool, brt); 2415 } 2416 2417 #if defined(BRIDGE_IPF) 2418 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2419 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2420 2421 /* 2422 * Send bridge packets through IPF if they are one of the types IPF can deal 2423 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2424 * question.) 2425 */ 2426 static int 2427 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2428 { 2429 int snap, error; 2430 struct ether_header *eh1, eh2; 2431 struct llc llc1; 2432 uint16_t ether_type; 2433 2434 snap = 0; 2435 error = -1; /* Default error if not error == 0 */ 2436 eh1 = mtod(*mp, struct ether_header *); 2437 ether_type = ntohs(eh1->ether_type); 2438 2439 /* 2440 * Check for SNAP/LLC. 2441 */ 2442 if (ether_type < ETHERMTU) { 2443 struct llc *llc2 = (struct llc *)(eh1 + 1); 2444 2445 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2446 llc2->llc_dsap == LLC_SNAP_LSAP && 2447 llc2->llc_ssap == LLC_SNAP_LSAP && 2448 llc2->llc_control == LLC_UI) { 2449 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2450 snap = 1; 2451 } 2452 } 2453 2454 /* 2455 * If we're trying to filter bridge traffic, don't look at anything 2456 * other than IP and ARP traffic. If the filter doesn't understand 2457 * IPv6, don't allow IPv6 through the bridge either. This is lame 2458 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2459 * but of course we don't have an AppleTalk filter to begin with. 2460 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2461 * ARP traffic.) 2462 */ 2463 switch (ether_type) { 2464 case ETHERTYPE_ARP: 2465 case ETHERTYPE_REVARP: 2466 return 0; /* Automatically pass */ 2467 case ETHERTYPE_IP: 2468 # ifdef INET6 2469 case ETHERTYPE_IPV6: 2470 # endif /* INET6 */ 2471 break; 2472 default: 2473 goto bad; 2474 } 2475 2476 /* Strip off the Ethernet header and keep a copy. */ 2477 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2478 m_adj(*mp, ETHER_HDR_LEN); 2479 2480 /* Strip off snap header, if present */ 2481 if (snap) { 2482 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2483 m_adj(*mp, sizeof(struct llc)); 2484 } 2485 2486 /* 2487 * Check basic packet sanity and run IPF through pfil. 2488 */ 2489 KASSERT(!cpu_intr_p()); 2490 switch (ether_type) 2491 { 2492 case ETHERTYPE_IP : 2493 error = (dir == PFIL_IN) ? bridge_ip_checkbasic(mp) : 0; 2494 if (error == 0) 2495 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2496 break; 2497 # ifdef INET6 2498 case ETHERTYPE_IPV6 : 2499 error = (dir == PFIL_IN) ? bridge_ip6_checkbasic(mp) : 0; 2500 if (error == 0) 2501 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2502 break; 2503 # endif 2504 default : 2505 error = 0; 2506 break; 2507 } 2508 2509 if (*mp == NULL) 2510 return error; 2511 if (error != 0) 2512 goto bad; 2513 2514 error = -1; 2515 2516 /* 2517 * Finally, put everything back the way it was and return 2518 */ 2519 if (snap) { 2520 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2521 if (*mp == NULL) 2522 return error; 2523 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2524 } 2525 2526 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2527 if (*mp == NULL) 2528 return error; 2529 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2530 2531 return 0; 2532 2533 bad: 2534 m_freem(*mp); 2535 *mp = NULL; 2536 return error; 2537 } 2538 2539 /* 2540 * Perform basic checks on header size since 2541 * IPF assumes ip_input has already processed 2542 * it for it. Cut-and-pasted from ip_input.c. 2543 * Given how simple the IPv6 version is, 2544 * does the IPv4 version really need to be 2545 * this complicated? 2546 * 2547 * XXX Should we update ipstat here, or not? 2548 * XXX Right now we update ipstat but not 2549 * XXX csum_counter. 2550 */ 2551 static int 2552 bridge_ip_checkbasic(struct mbuf **mp) 2553 { 2554 struct mbuf *m = *mp; 2555 struct ip *ip; 2556 int len, hlen; 2557 2558 if (*mp == NULL) 2559 return -1; 2560 2561 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2562 if ((m = m_copyup(m, sizeof(struct ip), 2563 (max_linkhdr + 3) & ~3)) == NULL) { 2564 /* XXXJRT new stat, please */ 2565 ip_statinc(IP_STAT_TOOSMALL); 2566 goto bad; 2567 } 2568 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2569 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2570 ip_statinc(IP_STAT_TOOSMALL); 2571 goto bad; 2572 } 2573 } 2574 ip = mtod(m, struct ip *); 2575 if (ip == NULL) goto bad; 2576 2577 if (ip->ip_v != IPVERSION) { 2578 ip_statinc(IP_STAT_BADVERS); 2579 goto bad; 2580 } 2581 hlen = ip->ip_hl << 2; 2582 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2583 ip_statinc(IP_STAT_BADHLEN); 2584 goto bad; 2585 } 2586 if (hlen > m->m_len) { 2587 if ((m = m_pullup(m, hlen)) == 0) { 2588 ip_statinc(IP_STAT_BADHLEN); 2589 goto bad; 2590 } 2591 ip = mtod(m, struct ip *); 2592 if (ip == NULL) goto bad; 2593 } 2594 2595 switch (m->m_pkthdr.csum_flags & 2596 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 2597 M_CSUM_IPv4_BAD)) { 2598 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2599 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2600 goto bad; 2601 2602 case M_CSUM_IPv4: 2603 /* Checksum was okay. */ 2604 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2605 break; 2606 2607 default: 2608 /* Must compute it ourselves. */ 2609 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2610 if (in_cksum(m, hlen) != 0) 2611 goto bad; 2612 break; 2613 } 2614 2615 /* Retrieve the packet length. */ 2616 len = ntohs(ip->ip_len); 2617 2618 /* 2619 * Check for additional length bogosity 2620 */ 2621 if (len < hlen) { 2622 ip_statinc(IP_STAT_BADLEN); 2623 goto bad; 2624 } 2625 2626 /* 2627 * Check that the amount of data in the buffers 2628 * is as at least much as the IP header would have us expect. 2629 * Drop packet if shorter than we expect. 2630 */ 2631 if (m->m_pkthdr.len < len) { 2632 ip_statinc(IP_STAT_TOOSHORT); 2633 goto bad; 2634 } 2635 2636 /* Checks out, proceed */ 2637 *mp = m; 2638 return 0; 2639 2640 bad: 2641 *mp = m; 2642 return -1; 2643 } 2644 2645 # ifdef INET6 2646 /* 2647 * Same as above, but for IPv6. 2648 * Cut-and-pasted from ip6_input.c. 2649 * XXX Should we update ip6stat, or not? 2650 */ 2651 static int 2652 bridge_ip6_checkbasic(struct mbuf **mp) 2653 { 2654 struct mbuf *m = *mp; 2655 struct ip6_hdr *ip6; 2656 2657 /* 2658 * If the IPv6 header is not aligned, slurp it up into a new 2659 * mbuf with space for link headers, in the event we forward 2660 * it. Otherwise, if it is aligned, make sure the entire base 2661 * IPv6 header is in the first mbuf of the chain. 2662 */ 2663 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2664 struct ifnet *inifp = m->m_pkthdr.rcvif; 2665 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2666 (max_linkhdr + 3) & ~3)) == NULL) { 2667 /* XXXJRT new stat, please */ 2668 ip6_statinc(IP6_STAT_TOOSMALL); 2669 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2670 goto bad; 2671 } 2672 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2673 struct ifnet *inifp = m->m_pkthdr.rcvif; 2674 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2675 ip6_statinc(IP6_STAT_TOOSMALL); 2676 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2677 goto bad; 2678 } 2679 } 2680 2681 ip6 = mtod(m, struct ip6_hdr *); 2682 2683 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2684 ip6_statinc(IP6_STAT_BADVERS); 2685 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 2686 goto bad; 2687 } 2688 2689 /* Checks out, proceed */ 2690 *mp = m; 2691 return 0; 2692 2693 bad: 2694 *mp = m; 2695 return -1; 2696 } 2697 # endif /* INET6 */ 2698 #endif /* BRIDGE_IPF */ 2699
Indexes created Mon Sep 22 13:09:51 GMT 2025