1 /* $NetBSD: if_bridge.c,v 1.199 2025/04/22 05:47:51 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 1.199 2025/04/22 05:47:51 ozaki-r Exp $"); 84 85 #ifdef _KERNEL_OPT 86 #include "opt_inet.h" 87 #include "opt_net_mpsafe.h" 88 #endif /* _KERNEL_OPT */ 89 90 #include <sys/param.h> 91 #include <sys/kernel.h> 92 #include <sys/mbuf.h> 93 #include <sys/queue.h> 94 #include <sys/socket.h> 95 #include <sys/socketvar.h> /* for softnet_lock */ 96 #include <sys/sockio.h> 97 #include <sys/systm.h> 98 #include <sys/proc.h> 99 #include <sys/pool.h> 100 #include <sys/kauth.h> 101 #include <sys/cpu.h> 102 #include <sys/cprng.h> 103 #include <sys/mutex.h> 104 #include <sys/kmem.h> 105 #include <sys/syslog.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 #include <net/ether_sw_offload.h> 116 117 /* 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 #include <netinet/ip6.h> 124 #include <netinet6/in6_var.h> 125 #include <netinet6/ip6_var.h> 126 #include <netinet6/ip6_private.h> /* XXX */ 127 128 /* 129 * Size of the route hash table. Must be a power of two. 130 */ 131 #ifndef BRIDGE_RTHASH_SIZE 132 #define BRIDGE_RTHASH_SIZE 1024 133 #endif 134 135 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 136 137 #include "carp.h" 138 #if NCARP > 0 139 #include <netinet/in.h> 140 #include <netinet/in_var.h> 141 #include <netinet/ip_carp.h> 142 #endif 143 144 #include "ioconf.h" 145 146 __CTASSERT(sizeof(struct ifbifconf) == sizeof(struct ifbaconf)); 147 __CTASSERT(offsetof(struct ifbifconf, ifbic_len) == offsetof(struct ifbaconf, ifbac_len)); 148 __CTASSERT(offsetof(struct ifbifconf, ifbic_buf) == offsetof(struct ifbaconf, ifbac_buf)); 149 150 /* 151 * Maximum number of addresses to cache. 152 */ 153 #ifndef BRIDGE_RTABLE_MAX 154 #define BRIDGE_RTABLE_MAX 100 155 #endif 156 157 /* 158 * Spanning tree defaults. 159 */ 160 #define BSTP_DEFAULT_MAX_AGE (20 * 256) 161 #define BSTP_DEFAULT_HELLO_TIME (2 * 256) 162 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) 163 #define BSTP_DEFAULT_HOLD_TIME (1 * 256) 164 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 165 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 166 #define BSTP_DEFAULT_PATH_COST 55 167 168 /* 169 * Timeout (in seconds) for entries learned dynamically. 170 */ 171 #ifndef BRIDGE_RTABLE_TIMEOUT 172 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 173 #endif 174 175 /* 176 * Number of seconds between walks of the route list. 177 */ 178 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 179 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 180 #endif 181 182 #define BRIDGE_RT_LOCK(_sc) mutex_enter((_sc)->sc_rtlist_lock) 183 #define BRIDGE_RT_UNLOCK(_sc) mutex_exit((_sc)->sc_rtlist_lock) 184 #define BRIDGE_RT_LOCKED(_sc) mutex_owned((_sc)->sc_rtlist_lock) 185 186 #define BRIDGE_RT_PSZ_PERFORM(_sc) \ 187 pserialize_perform((_sc)->sc_rtlist_psz) 188 189 #define BRIDGE_RTLIST_READER_FOREACH(_brt, _sc) \ 190 PSLIST_READER_FOREACH((_brt), &((_sc)->sc_rtlist), \ 191 struct bridge_rtnode, brt_list) 192 #define BRIDGE_RTLIST_WRITER_FOREACH(_brt, _sc) \ 193 PSLIST_WRITER_FOREACH((_brt), &((_sc)->sc_rtlist), \ 194 struct bridge_rtnode, brt_list) 195 #define BRIDGE_RTLIST_WRITER_INSERT_HEAD(_sc, _brt) \ 196 PSLIST_WRITER_INSERT_HEAD(&(_sc)->sc_rtlist, brt, brt_list) 197 #define BRIDGE_RTLIST_WRITER_REMOVE(_brt) \ 198 PSLIST_WRITER_REMOVE((_brt), brt_list) 199 200 #define BRIDGE_RTHASH_READER_FOREACH(_brt, _sc, _hash) \ 201 PSLIST_READER_FOREACH((_brt), &(_sc)->sc_rthash[(_hash)], \ 202 struct bridge_rtnode, brt_hash) 203 #define BRIDGE_RTHASH_WRITER_FOREACH(_brt, _sc, _hash) \ 204 PSLIST_WRITER_FOREACH((_brt), &(_sc)->sc_rthash[(_hash)], \ 205 struct bridge_rtnode, brt_hash) 206 #define BRIDGE_RTHASH_WRITER_INSERT_HEAD(_sc, _hash, _brt) \ 207 PSLIST_WRITER_INSERT_HEAD(&(_sc)->sc_rthash[(_hash)], brt, brt_hash) 208 #define BRIDGE_RTHASH_WRITER_INSERT_AFTER(_brt, _new) \ 209 PSLIST_WRITER_INSERT_AFTER((_brt), (_new), brt_hash) 210 #define BRIDGE_RTHASH_WRITER_REMOVE(_brt) \ 211 PSLIST_WRITER_REMOVE((_brt), brt_hash) 212 213 #ifdef NET_MPSAFE 214 #define DECLARE_LOCK_VARIABLE 215 #define ACQUIRE_GLOBAL_LOCKS() do { } while (0) 216 #define RELEASE_GLOBAL_LOCKS() do { } while (0) 217 #else 218 #define DECLARE_LOCK_VARIABLE int __s 219 #define ACQUIRE_GLOBAL_LOCKS() do { \ 220 KERNEL_LOCK(1, NULL); \ 221 mutex_enter(softnet_lock); \ 222 __s = splsoftnet(); \ 223 } while (0) 224 #define RELEASE_GLOBAL_LOCKS() do { \ 225 splx(__s); \ 226 mutex_exit(softnet_lock); \ 227 KERNEL_UNLOCK_ONE(NULL); \ 228 } while (0) 229 #endif 230 231 struct psref_class *bridge_psref_class __read_mostly; 232 233 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 234 235 static struct pool bridge_rtnode_pool; 236 237 static int bridge_clone_create(struct if_clone *, int); 238 static int bridge_clone_destroy(struct ifnet *); 239 240 static int bridge_ioctl(struct ifnet *, u_long, void *); 241 static int bridge_init(struct ifnet *); 242 static void bridge_stop(struct ifnet *, int); 243 static void bridge_start(struct ifnet *); 244 static void bridge_ifdetach(void *); 245 246 static void bridge_input(struct ifnet *, struct mbuf *); 247 static void bridge_forward(struct bridge_softc *, struct mbuf *); 248 249 static void bridge_timer(void *); 250 251 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, bool, 252 struct mbuf *); 253 254 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 255 struct ifnet *, int, uint8_t); 256 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 257 static void bridge_rttrim(struct bridge_softc *); 258 static void bridge_rtage(struct bridge_softc *); 259 static void bridge_rtage_work(struct work *, void *); 260 static void bridge_rtflush(struct bridge_softc *, int); 261 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 262 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp); 263 264 static void bridge_rtable_init(struct bridge_softc *); 265 static void bridge_rtable_fini(struct bridge_softc *); 266 267 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 268 const uint8_t *); 269 static int bridge_rtnode_insert(struct bridge_softc *, 270 struct bridge_rtnode *); 271 static void bridge_rtnode_remove(struct bridge_softc *, 272 struct bridge_rtnode *); 273 static void bridge_rtnode_destroy(struct bridge_rtnode *); 274 275 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 276 const char *name, 277 struct psref *); 278 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 279 struct ifnet *ifp, 280 struct psref *); 281 static void bridge_release_member(struct bridge_softc *, struct bridge_iflist *, 282 struct psref *); 283 static void bridge_delete_member(struct bridge_softc *, 284 struct bridge_iflist *); 285 static void bridge_acquire_member(struct bridge_softc *sc, 286 struct bridge_iflist *, 287 struct psref *); 288 289 static int bridge_ioctl_add(struct bridge_softc *, void *); 290 static int bridge_ioctl_del(struct bridge_softc *, void *); 291 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 292 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 293 static int bridge_ioctl_scache(struct bridge_softc *, void *); 294 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 295 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 296 static int bridge_ioctl_rts(struct bridge_softc *, void *); 297 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 298 static int bridge_ioctl_sto(struct bridge_softc *, void *); 299 static int bridge_ioctl_gto(struct bridge_softc *, void *); 300 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 301 static int bridge_ioctl_flush(struct bridge_softc *, void *); 302 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 303 static int bridge_ioctl_spri(struct bridge_softc *, void *); 304 static int bridge_ioctl_ght(struct bridge_softc *, void *); 305 static int bridge_ioctl_sht(struct bridge_softc *, void *); 306 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 307 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 308 static int bridge_ioctl_gma(struct bridge_softc *, void *); 309 static int bridge_ioctl_sma(struct bridge_softc *, void *); 310 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 311 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 312 static int bridge_ioctl_gfilt(struct bridge_softc *, void *); 313 static int bridge_ioctl_sfilt(struct bridge_softc *, void *); 314 static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int); 315 static int bridge_ip_checkbasic(struct mbuf **mp); 316 # ifdef INET6 317 static int bridge_ip6_checkbasic(struct mbuf **mp); 318 # endif /* INET6 */ 319 320 struct bridge_control { 321 int (*bc_func)(struct bridge_softc *, void *); 322 int bc_argsize; 323 int bc_flags; 324 }; 325 326 #define BC_F_COPYIN 0x01 /* copy arguments in */ 327 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 328 #define BC_F_SUSER 0x04 /* do super-user check */ 329 #define BC_F_XLATEIN 0x08 /* xlate arguments in */ 330 #define BC_F_XLATEOUT 0x10 /* xlate arguments out */ 331 332 static const struct bridge_control bridge_control_table[] = { 333 [BRDGADD] = {bridge_ioctl_add, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 334 [BRDGDEL] = {bridge_ioctl_del, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 335 336 [BRDGGIFFLGS] = {bridge_ioctl_gifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_COPYOUT}, 337 [BRDGSIFFLGS] = {bridge_ioctl_sifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 338 339 [BRDGSCACHE] = {bridge_ioctl_scache, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 340 [BRDGGCACHE] = {bridge_ioctl_gcache, sizeof(struct ifbrparam), BC_F_COPYOUT}, 341 342 [OBRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_COPYIN|BC_F_COPYOUT}, 343 [OBRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_COPYIN|BC_F_COPYOUT}, 344 345 [BRDGSADDR] = {bridge_ioctl_saddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 346 347 [BRDGSTO] = {bridge_ioctl_sto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 348 [BRDGGTO] = {bridge_ioctl_gto, sizeof(struct ifbrparam), BC_F_COPYOUT}, 349 350 [BRDGDADDR] = {bridge_ioctl_daddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 351 352 [BRDGFLUSH] = {bridge_ioctl_flush, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 353 354 [BRDGGPRI] = {bridge_ioctl_gpri, sizeof(struct ifbrparam), BC_F_COPYOUT}, 355 [BRDGSPRI] = {bridge_ioctl_spri, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 356 357 [BRDGGHT] = {bridge_ioctl_ght, sizeof(struct ifbrparam), BC_F_COPYOUT}, 358 [BRDGSHT] = {bridge_ioctl_sht, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 359 360 [BRDGGFD] = {bridge_ioctl_gfd, sizeof(struct ifbrparam), BC_F_COPYOUT}, 361 [BRDGSFD] = {bridge_ioctl_sfd, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 362 363 [BRDGGMA] = {bridge_ioctl_gma, sizeof(struct ifbrparam), BC_F_COPYOUT}, 364 [BRDGSMA] = {bridge_ioctl_sma, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 365 366 [BRDGSIFPRIO] = {bridge_ioctl_sifprio, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 367 368 [BRDGSIFCOST] = {bridge_ioctl_sifcost, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 369 370 [BRDGGFILT] = {bridge_ioctl_gfilt, sizeof(struct ifbrparam), BC_F_COPYOUT}, 371 [BRDGSFILT] = {bridge_ioctl_sfilt, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 372 373 [BRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 374 [BRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 375 }; 376 377 static const int bridge_control_table_size = __arraycount(bridge_control_table); 378 379 static struct if_clone bridge_cloner = 380 IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy); 381 382 /* 383 * bridgeattach: 384 * 385 * Pseudo-device attach routine. 386 */ 387 void 388 bridgeattach(int n) 389 { 390 391 pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode), 392 0, 0, 0, "brtpl", NULL, IPL_NET); 393 394 bridge_psref_class = psref_class_create("bridge", IPL_SOFTNET); 395 396 if_clone_attach(&bridge_cloner); 397 } 398 399 /* 400 * bridge_clone_create: 401 * 402 * Create a new bridge instance. 403 */ 404 static int 405 bridge_clone_create(struct if_clone *ifc, int unit) 406 { 407 struct bridge_softc *sc; 408 struct ifnet *ifp; 409 int error; 410 411 sc = kmem_zalloc(sizeof(*sc), KM_SLEEP); 412 ifp = &sc->sc_if; 413 414 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 415 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 416 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 417 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 418 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 419 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 420 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 421 sc->sc_filter_flags = 0; 422 423 /* Initialize our routing table. */ 424 bridge_rtable_init(sc); 425 426 error = workqueue_create(&sc->sc_rtage_wq, "bridge_rtage", 427 bridge_rtage_work, sc, PRI_SOFTNET, IPL_SOFTNET, WQ_MPSAFE); 428 if (error) 429 panic("%s: workqueue_create %d\n", __func__, error); 430 431 callout_init(&sc->sc_brcallout, CALLOUT_MPSAFE); 432 callout_init(&sc->sc_bstpcallout, CALLOUT_MPSAFE); 433 434 mutex_init(&sc->sc_iflist_psref.bip_lock, MUTEX_DEFAULT, IPL_NONE); 435 PSLIST_INIT(&sc->sc_iflist_psref.bip_iflist); 436 sc->sc_iflist_psref.bip_psz = pserialize_create(); 437 438 if_initname(ifp, ifc->ifc_name, unit); 439 ifp->if_softc = sc; 440 #ifdef NET_MPSAFE 441 ifp->if_extflags = IFEF_MPSAFE; 442 #endif 443 ifp->if_mtu = ETHERMTU; 444 ifp->if_ioctl = bridge_ioctl; 445 ifp->if_output = bridge_output; 446 ifp->if_start = bridge_start; 447 ifp->if_stop = bridge_stop; 448 ifp->if_init = bridge_init; 449 ifp->if_type = IFT_BRIDGE; 450 ifp->if_addrlen = 0; 451 ifp->if_dlt = DLT_EN10MB; 452 ifp->if_hdrlen = ETHER_HDR_LEN; 453 if_initialize(ifp); 454 455 /* 456 * Set the link state to down. 457 * When interfaces are added the link state will reflect 458 * the best link state of the combined interfaces. 459 */ 460 ifp->if_link_state = LINK_STATE_DOWN; 461 462 if_alloc_sadl(ifp); 463 if_register(ifp); 464 465 return 0; 466 } 467 468 /* 469 * bridge_clone_destroy: 470 * 471 * Destroy a bridge instance. 472 */ 473 static int 474 bridge_clone_destroy(struct ifnet *ifp) 475 { 476 struct bridge_softc *sc = ifp->if_softc; 477 struct bridge_iflist *bif; 478 479 if ((ifp->if_flags & IFF_RUNNING) != 0) 480 bridge_stop(ifp, 1); 481 482 BRIDGE_LOCK(sc); 483 for (;;) { 484 bif = PSLIST_WRITER_FIRST(&sc->sc_iflist_psref.bip_iflist, struct bridge_iflist, 485 bif_next); 486 if (bif == NULL) 487 break; 488 bridge_delete_member(sc, bif); 489 } 490 PSLIST_DESTROY(&sc->sc_iflist_psref.bip_iflist); 491 BRIDGE_UNLOCK(sc); 492 493 if_detach(ifp); 494 495 /* Tear down the routing table. */ 496 bridge_rtable_fini(sc); 497 498 pserialize_destroy(sc->sc_iflist_psref.bip_psz); 499 mutex_destroy(&sc->sc_iflist_psref.bip_lock); 500 callout_destroy(&sc->sc_brcallout); 501 callout_destroy(&sc->sc_bstpcallout); 502 workqueue_destroy(sc->sc_rtage_wq); 503 kmem_free(sc, sizeof(*sc)); 504 505 return 0; 506 } 507 508 /* 509 * bridge_ioctl: 510 * 511 * Handle a control request from the operator. 512 */ 513 static int 514 bridge_ioctl(struct ifnet *ifp, u_long cmd, void *data) 515 { 516 struct bridge_softc *sc = ifp->if_softc; 517 struct lwp *l = curlwp; /* XXX */ 518 union { 519 struct ifbreq ifbreq; 520 struct ifbifconf ifbifconf; 521 struct ifbareq ifbareq; 522 struct ifbaconf ifbaconf; 523 struct ifbrparam ifbrparam; 524 } args; 525 struct ifdrv *ifd = (struct ifdrv *) data; 526 const struct bridge_control *bc = NULL; /* XXXGCC */ 527 int error = 0; 528 529 /* Authorize command before calling splsoftnet(). */ 530 switch (cmd) { 531 case SIOCGDRVSPEC: 532 case SIOCSDRVSPEC: 533 if (ifd->ifd_cmd >= bridge_control_table_size 534 || (bc = &bridge_control_table[ifd->ifd_cmd]) == NULL) { 535 error = EINVAL; 536 return error; 537 } 538 539 /* We only care about BC_F_SUSER at this point. */ 540 if ((bc->bc_flags & BC_F_SUSER) == 0) 541 break; 542 543 error = kauth_authorize_network(l->l_cred, 544 KAUTH_NETWORK_INTERFACE_BRIDGE, 545 cmd == SIOCGDRVSPEC ? 546 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_GETPRIV : 547 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_SETPRIV, 548 ifd, NULL, NULL); 549 if (error) 550 return error; 551 552 break; 553 } 554 555 const int s = splsoftnet(); 556 557 switch (cmd) { 558 case SIOCGDRVSPEC: 559 case SIOCSDRVSPEC: 560 KASSERT(bc != NULL); 561 if (cmd == SIOCGDRVSPEC && 562 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) == 0) { 563 error = EINVAL; 564 break; 565 } 566 else if (cmd == SIOCSDRVSPEC && 567 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) != 0) { 568 error = EINVAL; 569 break; 570 } 571 572 /* BC_F_SUSER is checked above, before splsoftnet(). */ 573 574 if ((bc->bc_flags & (BC_F_XLATEIN|BC_F_XLATEOUT)) == 0 575 && (ifd->ifd_len != bc->bc_argsize 576 || ifd->ifd_len > sizeof(args))) { 577 error = EINVAL; 578 break; 579 } 580 581 memset(&args, 0, sizeof(args)); 582 if (bc->bc_flags & BC_F_COPYIN) { 583 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 584 if (error) 585 break; 586 } else if (bc->bc_flags & BC_F_XLATEIN) { 587 args.ifbifconf.ifbic_len = ifd->ifd_len; 588 args.ifbifconf.ifbic_buf = ifd->ifd_data; 589 } 590 591 error = (*bc->bc_func)(sc, &args); 592 if (error) 593 break; 594 595 if (bc->bc_flags & BC_F_COPYOUT) { 596 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 597 } else if (bc->bc_flags & BC_F_XLATEOUT) { 598 ifd->ifd_len = args.ifbifconf.ifbic_len; 599 ifd->ifd_data = args.ifbifconf.ifbic_buf; 600 } 601 break; 602 603 case SIOCSIFFLAGS: 604 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 605 break; 606 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 607 case IFF_RUNNING: 608 /* 609 * If interface is marked down and it is running, 610 * then stop and disable it. 611 */ 612 if_stop(ifp, 1); 613 break; 614 case IFF_UP: 615 /* 616 * If interface is marked up and it is stopped, then 617 * start it. 618 */ 619 error = if_init(ifp); 620 break; 621 default: 622 break; 623 } 624 break; 625 626 case SIOCSIFMTU: 627 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 628 error = 0; 629 break; 630 631 case SIOCGIFCAP: 632 { 633 struct ifcapreq *ifcr = (struct ifcapreq *)data; 634 ifcr->ifcr_capabilities = sc->sc_capenable; 635 ifcr->ifcr_capenable = sc->sc_capenable; 636 break; 637 } 638 639 default: 640 error = ifioctl_common(ifp, cmd, data); 641 break; 642 } 643 644 splx(s); 645 646 return error; 647 } 648 649 /* 650 * bridge_lookup_member: 651 * 652 * Lookup a bridge member interface. 653 */ 654 static struct bridge_iflist * 655 bridge_lookup_member(struct bridge_softc *sc, const char *name, struct psref *psref) 656 { 657 struct bridge_iflist *bif; 658 struct ifnet *ifp; 659 int s; 660 661 s = pserialize_read_enter(); 662 663 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 664 ifp = bif->bif_ifp; 665 if (strcmp(ifp->if_xname, name) == 0) 666 break; 667 } 668 if (bif != NULL) 669 bridge_acquire_member(sc, bif, psref); 670 671 pserialize_read_exit(s); 672 673 return bif; 674 } 675 676 /* 677 * bridge_lookup_member_if: 678 * 679 * Lookup a bridge member interface by ifnet*. 680 */ 681 static struct bridge_iflist * 682 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp, 683 struct psref *psref) 684 { 685 struct bridge_iflist *bif; 686 int s; 687 688 s = pserialize_read_enter(); 689 690 bif = member_ifp->if_bridgeif; 691 if (bif != NULL) { 692 psref_acquire(psref, &bif->bif_psref, 693 bridge_psref_class); 694 } 695 696 pserialize_read_exit(s); 697 698 return bif; 699 } 700 701 static void 702 bridge_acquire_member(struct bridge_softc *sc, struct bridge_iflist *bif, 703 struct psref *psref) 704 { 705 706 psref_acquire(psref, &bif->bif_psref, bridge_psref_class); 707 } 708 709 /* 710 * bridge_release_member: 711 * 712 * Release the specified member interface. 713 */ 714 static void 715 bridge_release_member(struct bridge_softc *sc, struct bridge_iflist *bif, 716 struct psref *psref) 717 { 718 719 psref_release(psref, &bif->bif_psref, bridge_psref_class); 720 } 721 722 /* 723 * bridge_delete_member: 724 * 725 * Delete the specified member interface. 726 */ 727 static void 728 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 729 { 730 struct ifnet *ifs = bif->bif_ifp; 731 732 KASSERT(BRIDGE_LOCKED(sc)); 733 734 ifs->_if_input = ether_input; 735 ifs->if_bridge = NULL; 736 ifs->if_bridgeif = NULL; 737 738 PSLIST_WRITER_REMOVE(bif, bif_next); 739 BRIDGE_PSZ_PERFORM(sc); 740 741 if_linkstate_change_disestablish(ifs, 742 bif->bif_linkstate_hook, BRIDGE_LOCK_OBJ(sc)); 743 ether_ifdetachhook_disestablish(ifs, 744 bif->bif_ifdetach_hook, BRIDGE_LOCK_OBJ(sc)); 745 746 BRIDGE_UNLOCK(sc); 747 748 switch (ifs->if_type) { 749 case IFT_ETHER: 750 case IFT_L2TP: 751 /* 752 * Take the interface out of promiscuous mode. 753 * Don't call it with holding a spin lock. 754 */ 755 (void) ifpromisc(ifs, 0); 756 IFNET_LOCK(ifs); 757 (void) ether_disable_vlan_mtu(ifs); 758 IFNET_UNLOCK(ifs); 759 break; 760 default: 761 #ifdef DIAGNOSTIC 762 panic("%s: impossible", __func__); 763 #endif 764 break; 765 } 766 767 psref_target_destroy(&bif->bif_psref, bridge_psref_class); 768 769 PSLIST_ENTRY_DESTROY(bif, bif_next); 770 kmem_free(bif, sizeof(*bif)); 771 772 BRIDGE_LOCK(sc); 773 } 774 775 /* 776 * bridge_calc_csum_flags: 777 * 778 * Calculate logical and b/w csum flags each member interface supports. 779 */ 780 void 781 bridge_calc_csum_flags(struct bridge_softc *sc) 782 { 783 struct bridge_iflist *bif; 784 struct ifnet *ifs = NULL; 785 int flags = ~0; 786 int capenable = ~0; 787 788 BRIDGE_LOCK(sc); 789 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 790 ifs = bif->bif_ifp; 791 flags &= ifs->if_csum_flags_tx; 792 capenable &= ifs->if_capenable; 793 } 794 sc->sc_csum_flags_tx = flags; 795 sc->sc_capenable = (ifs != NULL) ? capenable : 0; 796 BRIDGE_UNLOCK(sc); 797 } 798 799 /* 800 * bridge_calc_link_state: 801 * 802 * Calculate the link state based on each member interface. 803 */ 804 static void 805 bridge_calc_link_state(void *xsc) 806 { 807 struct bridge_softc *sc = xsc; 808 struct bridge_iflist *bif; 809 struct ifnet *ifs; 810 int link_state = LINK_STATE_DOWN; 811 812 BRIDGE_LOCK(sc); 813 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 814 ifs = bif->bif_ifp; 815 if (ifs->if_link_state == LINK_STATE_UP) { 816 link_state = LINK_STATE_UP; 817 break; 818 } 819 if (ifs->if_link_state == LINK_STATE_UNKNOWN) 820 link_state = LINK_STATE_UNKNOWN; 821 } 822 if_link_state_change(&sc->sc_if, link_state); 823 BRIDGE_UNLOCK(sc); 824 } 825 826 static int 827 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 828 { 829 struct ifbreq *req = arg; 830 struct bridge_iflist *bif = NULL; 831 struct ifnet *ifs; 832 int error = 0; 833 struct psref psref; 834 835 ifs = if_get(req->ifbr_ifsname, &psref); 836 if (ifs == NULL) 837 return ENOENT; 838 839 if (ifs->if_bridge == sc) { 840 error = EEXIST; 841 goto out; 842 } 843 844 if (ifs->if_bridge != NULL) { 845 error = EBUSY; 846 goto out; 847 } 848 849 if (ifs->_if_input != ether_input) { 850 error = EINVAL; 851 goto out; 852 } 853 854 /* FIXME: doesn't work with non-IFF_SIMPLEX interfaces */ 855 if ((ifs->if_flags & IFF_SIMPLEX) == 0) { 856 error = EINVAL; 857 goto out; 858 } 859 860 bif = kmem_alloc(sizeof(*bif), KM_SLEEP); 861 862 switch (ifs->if_type) { 863 case IFT_ETHER: 864 if (sc->sc_if.if_mtu != ifs->if_mtu) { 865 /* Change MTU of added interface to bridge MTU */ 866 struct ifreq ifr; 867 memset(&ifr, 0, sizeof(ifr)); 868 ifr.ifr_mtu = sc->sc_if.if_mtu; 869 IFNET_LOCK(ifs); 870 error = if_ioctl(ifs, SIOCSIFMTU, &ifr); 871 IFNET_UNLOCK(ifs); 872 if (error != 0) 873 goto out; 874 } 875 /* FALLTHROUGH */ 876 case IFT_L2TP: 877 IFNET_LOCK(ifs); 878 error = ether_enable_vlan_mtu(ifs); 879 IFNET_UNLOCK(ifs); 880 if (error > 0) 881 goto out; 882 /* 883 * Place the interface into promiscuous mode. 884 */ 885 error = ifpromisc(ifs, 1); 886 if (error) 887 goto out; 888 break; 889 default: 890 error = EINVAL; 891 goto out; 892 } 893 894 bif->bif_ifp = ifs; 895 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 896 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 897 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 898 bif->bif_linkstate_hook = if_linkstate_change_establish(ifs, 899 bridge_calc_link_state, sc); 900 PSLIST_ENTRY_INIT(bif, bif_next); 901 psref_target_init(&bif->bif_psref, bridge_psref_class); 902 903 BRIDGE_LOCK(sc); 904 905 ifs->if_bridge = sc; 906 ifs->if_bridgeif = bif; 907 PSLIST_WRITER_INSERT_HEAD(&sc->sc_iflist_psref.bip_iflist, bif, bif_next); 908 ifs->_if_input = bridge_input; 909 910 BRIDGE_UNLOCK(sc); 911 912 bif->bif_ifdetach_hook = ether_ifdetachhook_establish(ifs, 913 bridge_ifdetach, (void *)ifs); 914 915 bridge_calc_csum_flags(sc); 916 bridge_calc_link_state(sc); 917 918 if (sc->sc_if.if_flags & IFF_RUNNING) 919 bstp_initialization(sc); 920 else 921 bstp_stop(sc); 922 923 out: 924 if_put(ifs, &psref); 925 if (error) { 926 if (bif != NULL) 927 kmem_free(bif, sizeof(*bif)); 928 } 929 return error; 930 } 931 932 static int 933 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 934 { 935 struct ifbreq *req = arg; 936 const char *name = req->ifbr_ifsname; 937 struct bridge_iflist *bif; 938 struct ifnet *ifs; 939 940 BRIDGE_LOCK(sc); 941 942 /* 943 * Don't use bridge_lookup_member. We want to get a member 944 * with bif_refs == 0. 945 */ 946 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 947 ifs = bif->bif_ifp; 948 if (strcmp(ifs->if_xname, name) == 0) 949 break; 950 } 951 952 if (bif == NULL) { 953 BRIDGE_UNLOCK(sc); 954 return ENOENT; 955 } 956 957 bridge_delete_member(sc, bif); 958 959 BRIDGE_UNLOCK(sc); 960 961 bridge_rtdelete(sc, ifs); 962 bridge_calc_csum_flags(sc); 963 bridge_calc_link_state(sc); 964 965 if (sc->sc_if.if_flags & IFF_RUNNING) 966 bstp_initialization(sc); 967 968 return 0; 969 } 970 971 static int 972 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 973 { 974 struct ifbreq *req = arg; 975 struct bridge_iflist *bif; 976 struct psref psref; 977 978 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 979 if (bif == NULL) 980 return ENOENT; 981 982 req->ifbr_ifsflags = bif->bif_flags; 983 req->ifbr_state = bif->bif_state; 984 req->ifbr_priority = bif->bif_priority; 985 req->ifbr_path_cost = bif->bif_path_cost; 986 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 987 988 bridge_release_member(sc, bif, &psref); 989 990 return 0; 991 } 992 993 static int 994 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 995 { 996 struct ifbreq *req = arg; 997 struct bridge_iflist *bif; 998 struct psref psref; 999 1000 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1001 if (bif == NULL) 1002 return ENOENT; 1003 1004 if (req->ifbr_ifsflags & IFBIF_STP) { 1005 switch (bif->bif_ifp->if_type) { 1006 case IFT_ETHER: 1007 case IFT_L2TP: 1008 /* These can do spanning tree. */ 1009 break; 1010 1011 default: 1012 /* Nothing else can. */ 1013 bridge_release_member(sc, bif, &psref); 1014 return EINVAL; 1015 } 1016 } 1017 1018 if (bif->bif_flags & IFBIF_PROTECTED) { 1019 if ((req->ifbr_ifsflags & IFBIF_PROTECTED) == 0) { 1020 log(LOG_INFO, "%s: disabling protection on %s\n", 1021 sc->sc_if.if_xname, bif->bif_ifp->if_xname); 1022 } 1023 } else { 1024 if (req->ifbr_ifsflags & IFBIF_PROTECTED) { 1025 log(LOG_INFO, "%s: enabling protection on %s\n", 1026 sc->sc_if.if_xname, bif->bif_ifp->if_xname); 1027 } 1028 } 1029 1030 bif->bif_flags = req->ifbr_ifsflags; 1031 1032 bridge_release_member(sc, bif, &psref); 1033 1034 if (sc->sc_if.if_flags & IFF_RUNNING) 1035 bstp_initialization(sc); 1036 1037 return 0; 1038 } 1039 1040 static int 1041 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1042 { 1043 struct ifbrparam *param = arg; 1044 1045 sc->sc_brtmax = param->ifbrp_csize; 1046 bridge_rttrim(sc); 1047 1048 return 0; 1049 } 1050 1051 static int 1052 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1053 { 1054 struct ifbrparam *param = arg; 1055 1056 param->ifbrp_csize = sc->sc_brtmax; 1057 1058 return 0; 1059 } 1060 1061 static int 1062 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1063 { 1064 struct ifbifconf *bifc = arg; 1065 struct bridge_iflist *bif; 1066 struct ifbreq *breqs; 1067 int i, count, error = 0; 1068 1069 retry: 1070 BRIDGE_LOCK(sc); 1071 count = 0; 1072 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 1073 count++; 1074 BRIDGE_UNLOCK(sc); 1075 1076 if (count == 0) { 1077 bifc->ifbic_len = 0; 1078 return 0; 1079 } 1080 1081 if (bifc->ifbic_len == 0 || bifc->ifbic_len < (sizeof(*breqs) * count)) { 1082 /* Tell that a larger buffer is needed */ 1083 bifc->ifbic_len = sizeof(*breqs) * count; 1084 return 0; 1085 } 1086 1087 breqs = kmem_alloc(sizeof(*breqs) * count, KM_SLEEP); 1088 1089 BRIDGE_LOCK(sc); 1090 1091 i = 0; 1092 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 1093 i++; 1094 if (i > count) { 1095 /* 1096 * The number of members has been increased. 1097 * We need more memory! 1098 */ 1099 BRIDGE_UNLOCK(sc); 1100 kmem_free(breqs, sizeof(*breqs) * count); 1101 goto retry; 1102 } 1103 1104 i = 0; 1105 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 1106 struct ifbreq *breq = &breqs[i++]; 1107 memset(breq, 0, sizeof(*breq)); 1108 1109 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, 1110 sizeof(breq->ifbr_ifsname)); 1111 breq->ifbr_ifsflags = bif->bif_flags; 1112 breq->ifbr_state = bif->bif_state; 1113 breq->ifbr_priority = bif->bif_priority; 1114 breq->ifbr_path_cost = bif->bif_path_cost; 1115 breq->ifbr_portno = bif->bif_ifp->if_index & 0xff; 1116 } 1117 1118 /* Don't call copyout with holding the mutex */ 1119 BRIDGE_UNLOCK(sc); 1120 1121 for (i = 0; i < count; i++) { 1122 error = copyout(&breqs[i], bifc->ifbic_req + i, sizeof(*breqs)); 1123 if (error) 1124 break; 1125 } 1126 bifc->ifbic_len = sizeof(*breqs) * i; 1127 1128 kmem_free(breqs, sizeof(*breqs) * count); 1129 1130 return error; 1131 } 1132 1133 static int 1134 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1135 { 1136 struct ifbaconf *bac = arg; 1137 struct bridge_rtnode *brt; 1138 struct ifbareq bareq; 1139 int count = 0, error = 0, len; 1140 1141 if (bac->ifbac_len == 0) 1142 return 0; 1143 1144 BRIDGE_RT_LOCK(sc); 1145 1146 /* The passed buffer is not enough, tell a required size. */ 1147 if (bac->ifbac_len < (sizeof(bareq) * sc->sc_brtcnt)) { 1148 count = sc->sc_brtcnt; 1149 goto out; 1150 } 1151 1152 len = bac->ifbac_len; 1153 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 1154 if (len < sizeof(bareq)) 1155 goto out; 1156 memset(&bareq, 0, sizeof(bareq)); 1157 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1158 sizeof(bareq.ifba_ifsname)); 1159 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1160 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1161 bareq.ifba_expire = brt->brt_expire - time_uptime; 1162 } else 1163 bareq.ifba_expire = 0; 1164 bareq.ifba_flags = brt->brt_flags; 1165 1166 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1167 if (error) 1168 goto out; 1169 count++; 1170 len -= sizeof(bareq); 1171 } 1172 out: 1173 BRIDGE_RT_UNLOCK(sc); 1174 1175 bac->ifbac_len = sizeof(bareq) * count; 1176 return error; 1177 } 1178 1179 static int 1180 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1181 { 1182 struct ifbareq *req = arg; 1183 struct bridge_iflist *bif; 1184 int error; 1185 struct psref psref; 1186 1187 bif = bridge_lookup_member(sc, req->ifba_ifsname, &psref); 1188 if (bif == NULL) 1189 return ENOENT; 1190 1191 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1192 req->ifba_flags); 1193 1194 bridge_release_member(sc, bif, &psref); 1195 1196 return error; 1197 } 1198 1199 static int 1200 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1201 { 1202 struct ifbrparam *param = arg; 1203 1204 sc->sc_brttimeout = param->ifbrp_ctime; 1205 1206 return 0; 1207 } 1208 1209 static int 1210 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1211 { 1212 struct ifbrparam *param = arg; 1213 1214 param->ifbrp_ctime = sc->sc_brttimeout; 1215 1216 return 0; 1217 } 1218 1219 static int 1220 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1221 { 1222 struct ifbareq *req = arg; 1223 1224 return (bridge_rtdaddr(sc, req->ifba_dst)); 1225 } 1226 1227 static int 1228 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1229 { 1230 struct ifbreq *req = arg; 1231 1232 bridge_rtflush(sc, req->ifbr_ifsflags); 1233 1234 return 0; 1235 } 1236 1237 static int 1238 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1239 { 1240 struct ifbrparam *param = arg; 1241 1242 param->ifbrp_prio = sc->sc_bridge_priority; 1243 1244 return 0; 1245 } 1246 1247 static int 1248 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1249 { 1250 struct ifbrparam *param = arg; 1251 1252 sc->sc_bridge_priority = param->ifbrp_prio; 1253 1254 if (sc->sc_if.if_flags & IFF_RUNNING) 1255 bstp_initialization(sc); 1256 1257 return 0; 1258 } 1259 1260 static int 1261 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1262 { 1263 struct ifbrparam *param = arg; 1264 1265 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1266 1267 return 0; 1268 } 1269 1270 static int 1271 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1272 { 1273 struct ifbrparam *param = arg; 1274 1275 if (param->ifbrp_hellotime == 0) 1276 return EINVAL; 1277 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1278 1279 if (sc->sc_if.if_flags & IFF_RUNNING) 1280 bstp_initialization(sc); 1281 1282 return 0; 1283 } 1284 1285 static int 1286 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1287 { 1288 struct ifbrparam *param = arg; 1289 1290 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1291 1292 return 0; 1293 } 1294 1295 static int 1296 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1297 { 1298 struct ifbrparam *param = arg; 1299 1300 if (param->ifbrp_fwddelay == 0) 1301 return EINVAL; 1302 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1303 1304 if (sc->sc_if.if_flags & IFF_RUNNING) 1305 bstp_initialization(sc); 1306 1307 return 0; 1308 } 1309 1310 static int 1311 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1312 { 1313 struct ifbrparam *param = arg; 1314 1315 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1316 1317 return 0; 1318 } 1319 1320 static int 1321 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1322 { 1323 struct ifbrparam *param = arg; 1324 1325 if (param->ifbrp_maxage == 0) 1326 return EINVAL; 1327 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1328 1329 if (sc->sc_if.if_flags & IFF_RUNNING) 1330 bstp_initialization(sc); 1331 1332 return 0; 1333 } 1334 1335 static int 1336 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1337 { 1338 struct ifbreq *req = arg; 1339 struct bridge_iflist *bif; 1340 struct psref psref; 1341 1342 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1343 if (bif == NULL) 1344 return ENOENT; 1345 1346 bif->bif_priority = req->ifbr_priority; 1347 1348 if (sc->sc_if.if_flags & IFF_RUNNING) 1349 bstp_initialization(sc); 1350 1351 bridge_release_member(sc, bif, &psref); 1352 1353 return 0; 1354 } 1355 1356 static int 1357 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1358 { 1359 struct ifbrparam *param = arg; 1360 1361 param->ifbrp_filter = sc->sc_filter_flags; 1362 1363 return 0; 1364 } 1365 1366 static int 1367 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1368 { 1369 struct ifbrparam *param = arg; 1370 uint32_t nflags, oflags; 1371 1372 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1373 return EINVAL; 1374 1375 nflags = param->ifbrp_filter; 1376 oflags = sc->sc_filter_flags; 1377 1378 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1379 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1380 sc->sc_if.if_pfil); 1381 } 1382 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1383 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1384 sc->sc_if.if_pfil); 1385 } 1386 1387 sc->sc_filter_flags = nflags; 1388 1389 return 0; 1390 } 1391 1392 static int 1393 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1394 { 1395 struct ifbreq *req = arg; 1396 struct bridge_iflist *bif; 1397 struct psref psref; 1398 1399 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1400 if (bif == NULL) 1401 return ENOENT; 1402 1403 bif->bif_path_cost = req->ifbr_path_cost; 1404 1405 if (sc->sc_if.if_flags & IFF_RUNNING) 1406 bstp_initialization(sc); 1407 1408 bridge_release_member(sc, bif, &psref); 1409 1410 return 0; 1411 } 1412 1413 /* 1414 * bridge_ifdetach: 1415 * 1416 * Detach an interface from a bridge. Called when a member 1417 * interface is detaching. 1418 */ 1419 static void 1420 bridge_ifdetach(void *xifs) 1421 { 1422 struct ifnet *ifs; 1423 struct bridge_softc *sc; 1424 struct ifbreq breq; 1425 1426 ifs = (struct ifnet *)xifs; 1427 sc = ifs->if_bridge; 1428 1429 /* ioctl_lock should prevent this from happening */ 1430 KASSERT(sc != NULL); 1431 1432 memset(&breq, 0, sizeof(breq)); 1433 strlcpy(breq.ifbr_ifsname, ifs->if_xname, sizeof(breq.ifbr_ifsname)); 1434 1435 (void) bridge_ioctl_del(sc, &breq); 1436 } 1437 1438 /* 1439 * bridge_init: 1440 * 1441 * Initialize a bridge interface. 1442 */ 1443 static int 1444 bridge_init(struct ifnet *ifp) 1445 { 1446 struct bridge_softc *sc = ifp->if_softc; 1447 1448 KASSERT((ifp->if_flags & IFF_RUNNING) == 0); 1449 1450 BRIDGE_LOCK(sc); 1451 sc->sc_stopping = false; 1452 BRIDGE_UNLOCK(sc); 1453 1454 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1455 bridge_timer, sc); 1456 bstp_initialization(sc); 1457 1458 ifp->if_flags |= IFF_RUNNING; 1459 return 0; 1460 } 1461 1462 /* 1463 * bridge_stop: 1464 * 1465 * Stop the bridge interface. 1466 */ 1467 static void 1468 bridge_stop(struct ifnet *ifp, int disable) 1469 { 1470 struct bridge_softc *sc = ifp->if_softc; 1471 1472 KASSERT((ifp->if_flags & IFF_RUNNING) != 0); 1473 ifp->if_flags &= ~IFF_RUNNING; 1474 1475 BRIDGE_LOCK(sc); 1476 sc->sc_stopping = true; 1477 BRIDGE_UNLOCK(sc); 1478 1479 callout_halt(&sc->sc_brcallout, NULL); 1480 workqueue_wait(sc->sc_rtage_wq, &sc->sc_rtage_wk); 1481 bstp_stop(sc); 1482 bridge_rtflush(sc, IFBF_FLUSHDYN); 1483 } 1484 1485 /* 1486 * bridge_enqueue: 1487 * 1488 * Enqueue a packet on a bridge member interface. 1489 */ 1490 void 1491 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1492 int runfilt) 1493 { 1494 int len, error; 1495 short mflags; 1496 1497 if (runfilt) { 1498 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1499 dst_ifp, PFIL_OUT) != 0) { 1500 m_freem(m); 1501 return; 1502 } 1503 if (m == NULL) 1504 return; 1505 } 1506 1507 #ifdef ALTQ 1508 KERNEL_LOCK(1, NULL); 1509 /* 1510 * If ALTQ is enabled on the member interface, do 1511 * classification; the queueing discipline might 1512 * not require classification, but might require 1513 * the address family/header pointer in the pktattr. 1514 */ 1515 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1516 /* XXX IFT_ETHER */ 1517 altq_etherclassify(&dst_ifp->if_snd, m); 1518 } 1519 KERNEL_UNLOCK_ONE(NULL); 1520 #endif /* ALTQ */ 1521 1522 if (vlan_has_tag(m) && 1523 !vlan_is_hwtag_enabled(dst_ifp)) { 1524 (void)ether_inject_vlantag(&m, ETHERTYPE_VLAN, 1525 vlan_get_tag(m)); 1526 if (m == NULL) { 1527 if_statinc(&sc->sc_if, if_oerrors); 1528 return; 1529 } 1530 } 1531 1532 len = m->m_pkthdr.len; 1533 mflags = m->m_flags; 1534 1535 error = if_transmit_lock(dst_ifp, m); 1536 if (error) { 1537 /* mbuf is already freed */ 1538 if_statinc(&sc->sc_if, if_oerrors); 1539 return; 1540 } 1541 1542 net_stat_ref_t nsr = IF_STAT_GETREF(&sc->sc_if); 1543 if_statinc_ref(&sc->sc_if, nsr, if_opackets); 1544 if_statadd_ref(&sc->sc_if, nsr, if_obytes, len); 1545 if (mflags & M_MCAST) 1546 if_statinc_ref(&sc->sc_if, nsr, if_omcasts); 1547 IF_STAT_PUTREF(&sc->sc_if); 1548 } 1549 1550 /* 1551 * bridge_output: 1552 * 1553 * Send output from a bridge member interface. This 1554 * performs the bridging function for locally originated 1555 * packets. 1556 * 1557 * The mbuf has the Ethernet header already attached. We must 1558 * enqueue or free the mbuf before returning. 1559 */ 1560 int 1561 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1562 const struct rtentry *rt) 1563 { 1564 struct ether_header *eh; 1565 struct ifnet *dst_if; 1566 struct bridge_softc *sc; 1567 struct mbuf *n; 1568 int s, bound; 1569 1570 /* 1571 * bridge_output() is called from ether_output(), furthermore 1572 * ifp argument doesn't point to bridge(4). So, don't assert 1573 * IFEF_MPSAFE here. 1574 */ 1575 1576 KASSERT(m->m_len >= ETHER_HDR_LEN); 1577 1578 eh = mtod(m, struct ether_header *); 1579 sc = ifp->if_bridge; 1580 1581 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1582 if (memcmp(etherbroadcastaddr, 1583 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1584 m->m_flags |= M_BCAST; 1585 else 1586 m->m_flags |= M_MCAST; 1587 } 1588 1589 /* 1590 * If bridge is down, but the original output interface is up, 1591 * go ahead and send out that interface. Otherwise, the packet 1592 * is dropped below. 1593 */ 1594 if (__predict_false(sc == NULL) || 1595 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1596 dst_if = ifp; 1597 goto unicast_asis; 1598 } 1599 1600 /* 1601 * If the packet is a multicast, or we don't know a better way to 1602 * get there, send to all interfaces. 1603 */ 1604 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0) 1605 dst_if = NULL; 1606 else 1607 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1608 1609 /* 1610 * In general, we need to handle TX offload in software before 1611 * enqueueing a packet. However, we can send it as is in the 1612 * cases of unicast via (1) the source interface, or (2) an 1613 * interface which supports the specified offload options. 1614 * For multicast or broadcast, send it as is only if (3) all 1615 * the member interfaces support the specified options. 1616 */ 1617 1618 /* 1619 * Unicast via the source interface. 1620 */ 1621 if (dst_if == ifp) 1622 goto unicast_asis; 1623 1624 /* 1625 * Unicast via other interface. 1626 */ 1627 if (dst_if != NULL) { 1628 KASSERT(m->m_flags & M_PKTHDR); 1629 if (TX_OFFLOAD_SUPPORTED(dst_if->if_csum_flags_tx, 1630 m->m_pkthdr.csum_flags)) { 1631 /* 1632 * Unicast via an interface which supports the 1633 * specified offload options. 1634 */ 1635 goto unicast_asis; 1636 } 1637 1638 /* 1639 * Handle TX offload in software. For TSO, a packet is 1640 * split into multiple chunks. Thus, the return value of 1641 * ether_sw_offload_tx() is mbuf queue consists of them. 1642 */ 1643 m = ether_sw_offload_tx(ifp, m); 1644 if (m == NULL) 1645 return 0; 1646 1647 do { 1648 n = m->m_nextpkt; 1649 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1650 m_freem(m); 1651 else 1652 bridge_enqueue(sc, dst_if, m, 0); 1653 m = n; 1654 } while (m != NULL); 1655 1656 return 0; 1657 } 1658 1659 /* 1660 * Multicast or broadcast. 1661 */ 1662 if (TX_OFFLOAD_SUPPORTED(sc->sc_csum_flags_tx, 1663 m->m_pkthdr.csum_flags)) { 1664 /* 1665 * Specified TX offload options are supported by all 1666 * the member interfaces of this bridge. 1667 */ 1668 m->m_nextpkt = NULL; /* XXX */ 1669 } else { 1670 /* 1671 * Otherwise, handle TX offload in software. 1672 */ 1673 m = ether_sw_offload_tx(ifp, m); 1674 if (m == NULL) 1675 return 0; 1676 } 1677 1678 /* 1679 * When we use pppoe over bridge, bridge_output() can be called 1680 * in a lwp context by pppoe_timeout_wk(). 1681 */ 1682 bound = curlwp_bind(); 1683 do { 1684 /* XXX Should call bridge_broadcast, but there are locking 1685 * issues which need resolving first. */ 1686 struct bridge_iflist *bif; 1687 struct mbuf *mc; 1688 bool used = false; 1689 1690 n = m->m_nextpkt; 1691 1692 s = pserialize_read_enter(); 1693 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1694 struct psref psref; 1695 1696 bridge_acquire_member(sc, bif, &psref); 1697 pserialize_read_exit(s); 1698 1699 dst_if = bif->bif_ifp; 1700 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1701 goto next; 1702 1703 /* 1704 * If this is not the original output interface, 1705 * and the interface is participating in spanning 1706 * tree, make sure the port is in a state that 1707 * allows forwarding. 1708 */ 1709 if (dst_if != ifp && 1710 (bif->bif_flags & IFBIF_STP) != 0) { 1711 switch (bif->bif_state) { 1712 case BSTP_IFSTATE_BLOCKING: 1713 case BSTP_IFSTATE_LISTENING: 1714 case BSTP_IFSTATE_DISABLED: 1715 goto next; 1716 } 1717 } 1718 1719 if (PSLIST_READER_NEXT(bif, struct bridge_iflist, 1720 bif_next) == NULL && 1721 ((m->m_flags & (M_MCAST | M_BCAST)) == 0 || 1722 dst_if == ifp)) 1723 { 1724 used = true; 1725 mc = m; 1726 } else { 1727 mc = m_copypacket(m, M_DONTWAIT); 1728 if (mc == NULL) { 1729 if_statinc(&sc->sc_if, if_oerrors); 1730 goto next; 1731 } 1732 } 1733 1734 bridge_enqueue(sc, dst_if, mc, 0); 1735 1736 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0 && 1737 dst_if != ifp) 1738 { 1739 if (PSLIST_READER_NEXT(bif, 1740 struct bridge_iflist, bif_next) == NULL) 1741 { 1742 used = true; 1743 mc = m; 1744 } else { 1745 mc = m_copypacket(m, M_DONTWAIT); 1746 if (mc == NULL) { 1747 if_statinc(&sc->sc_if, 1748 if_oerrors); 1749 goto next; 1750 } 1751 } 1752 1753 m_set_rcvif(mc, dst_if); 1754 mc->m_flags &= ~M_PROMISC; 1755 1756 const int _s = splsoftnet(); 1757 KERNEL_LOCK_UNLESS_IFP_MPSAFE(dst_if); 1758 ether_input(dst_if, mc); 1759 KERNEL_UNLOCK_UNLESS_IFP_MPSAFE(dst_if); 1760 splx(_s); 1761 } 1762 1763 next: 1764 s = pserialize_read_enter(); 1765 bridge_release_member(sc, bif, &psref); 1766 1767 /* Guarantee we don't re-enter the loop as we already 1768 * decided we're at the end. */ 1769 if (used) 1770 break; 1771 } 1772 pserialize_read_exit(s); 1773 1774 if (!used) 1775 m_freem(m); 1776 1777 m = n; 1778 } while (m != NULL); 1779 curlwp_bindx(bound); 1780 1781 return 0; 1782 1783 unicast_asis: 1784 /* 1785 * XXX Spanning tree consideration here? 1786 */ 1787 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1788 m_freem(m); 1789 else 1790 bridge_enqueue(sc, dst_if, m, 0); 1791 return 0; 1792 } 1793 1794 /* 1795 * bridge_start: 1796 * 1797 * Start output on a bridge. 1798 * 1799 * NOTE: This routine should never be called in this implementation. 1800 */ 1801 static void 1802 bridge_start(struct ifnet *ifp) 1803 { 1804 1805 printf("%s: bridge_start() called\n", ifp->if_xname); 1806 } 1807 1808 /* 1809 * bridge_forward: 1810 * 1811 * The forwarding function of the bridge. 1812 */ 1813 static void 1814 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1815 { 1816 struct bridge_iflist *bif; 1817 struct ifnet *src_if, *dst_if; 1818 struct ether_header *eh; 1819 struct psref psref; 1820 struct psref psref_src; 1821 DECLARE_LOCK_VARIABLE; 1822 bool src_if_protected; 1823 1824 src_if = m_get_rcvif_psref(m, &psref_src); 1825 if (src_if == NULL) { 1826 /* Interface is being destroyed? */ 1827 goto discard; 1828 } 1829 1830 if_statadd2(&sc->sc_if, if_ipackets, 1, if_ibytes, m->m_pkthdr.len); 1831 1832 /* 1833 * Look up the bridge_iflist. 1834 */ 1835 bif = bridge_lookup_member_if(sc, src_if, &psref); 1836 if (bif == NULL) { 1837 /* Interface is not a bridge member (anymore?) */ 1838 goto discard; 1839 } 1840 1841 if (bif->bif_flags & IFBIF_STP) { 1842 switch (bif->bif_state) { 1843 case BSTP_IFSTATE_BLOCKING: 1844 case BSTP_IFSTATE_LISTENING: 1845 case BSTP_IFSTATE_DISABLED: 1846 bridge_release_member(sc, bif, &psref); 1847 goto discard; 1848 } 1849 } 1850 1851 eh = mtod(m, struct ether_header *); 1852 1853 /* 1854 * If the interface is learning, and the source 1855 * address is valid and not multicast, record 1856 * the address. 1857 */ 1858 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1859 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1860 (eh->ether_shost[0] == 0 && 1861 eh->ether_shost[1] == 0 && 1862 eh->ether_shost[2] == 0 && 1863 eh->ether_shost[3] == 0 && 1864 eh->ether_shost[4] == 0 && 1865 eh->ether_shost[5] == 0) == 0) { 1866 (void) bridge_rtupdate(sc, eh->ether_shost, 1867 src_if, 0, IFBAF_DYNAMIC); 1868 } 1869 1870 if ((bif->bif_flags & IFBIF_STP) != 0 && 1871 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1872 bridge_release_member(sc, bif, &psref); 1873 goto discard; 1874 } 1875 1876 src_if_protected = ((bif->bif_flags & IFBIF_PROTECTED) != 0); 1877 1878 bridge_release_member(sc, bif, &psref); 1879 1880 /* 1881 * At this point, the port either doesn't participate 1882 * in spanning tree or it is in the forwarding state. 1883 */ 1884 1885 /* 1886 * If the packet is unicast, destined for someone on 1887 * "this" side of the bridge, drop it. 1888 */ 1889 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1890 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1891 if (src_if == dst_if) 1892 goto discard; 1893 } else { 1894 /* ...forward it to all interfaces. */ 1895 if_statinc(&sc->sc_if, if_imcasts); 1896 dst_if = NULL; 1897 } 1898 1899 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, src_if, PFIL_IN) != 0 || 1900 m == NULL) { 1901 goto discard; 1902 } 1903 1904 if (dst_if == NULL) { 1905 bridge_broadcast(sc, src_if, src_if_protected, m); 1906 goto out; 1907 } 1908 1909 m_put_rcvif_psref(src_if, &psref_src); 1910 src_if = NULL; 1911 1912 /* 1913 * At this point, we're dealing with a unicast frame 1914 * going to a different interface. 1915 */ 1916 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1917 goto discard; 1918 1919 bif = bridge_lookup_member_if(sc, dst_if, &psref); 1920 if (bif == NULL) { 1921 /* Not a member of the bridge (anymore?) */ 1922 goto discard; 1923 } 1924 1925 if (bif->bif_flags & IFBIF_STP) { 1926 switch (bif->bif_state) { 1927 case BSTP_IFSTATE_DISABLED: 1928 case BSTP_IFSTATE_BLOCKING: 1929 bridge_release_member(sc, bif, &psref); 1930 goto discard; 1931 } 1932 } 1933 1934 if ((bif->bif_flags & IFBIF_PROTECTED) && src_if_protected) { 1935 bridge_release_member(sc, bif, &psref); 1936 goto discard; 1937 } 1938 1939 bridge_release_member(sc, bif, &psref); 1940 1941 /* 1942 * Before enqueueing this packet to the destination interface, 1943 * clear any in-bound checksum flags to prevent them from being 1944 * misused as out-bound flags. 1945 */ 1946 m->m_pkthdr.csum_flags = 0; 1947 1948 ACQUIRE_GLOBAL_LOCKS(); 1949 bridge_enqueue(sc, dst_if, m, 1); 1950 RELEASE_GLOBAL_LOCKS(); 1951 out: 1952 if (src_if != NULL) 1953 m_put_rcvif_psref(src_if, &psref_src); 1954 return; 1955 1956 discard: 1957 m_freem(m); 1958 goto out; 1959 } 1960 1961 static bool 1962 bstp_state_before_learning(struct bridge_iflist *bif) 1963 { 1964 if (bif->bif_flags & IFBIF_STP) { 1965 switch (bif->bif_state) { 1966 case BSTP_IFSTATE_BLOCKING: 1967 case BSTP_IFSTATE_LISTENING: 1968 case BSTP_IFSTATE_DISABLED: 1969 return true; 1970 } 1971 } 1972 return false; 1973 } 1974 1975 static bool 1976 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1977 { 1978 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1979 1980 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1981 #if NCARP > 0 1982 || (bif->bif_ifp->if_carp && 1983 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1984 #endif /* NCARP > 0 */ 1985 ) 1986 return true; 1987 1988 return false; 1989 } 1990 1991 /* 1992 * bridge_input: 1993 * 1994 * Receive input from a member interface. Queue the packet for 1995 * bridging if it is not for us. 1996 */ 1997 static void 1998 bridge_input(struct ifnet *ifp, struct mbuf *m) 1999 { 2000 struct bridge_softc *sc = ifp->if_bridge; 2001 struct bridge_iflist *bif; 2002 struct ether_header *eh; 2003 struct psref psref; 2004 int bound; 2005 DECLARE_LOCK_VARIABLE; 2006 2007 KASSERT(!cpu_intr_p()); 2008 2009 if (__predict_false(sc == NULL) || 2010 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 2011 ACQUIRE_GLOBAL_LOCKS(); 2012 ether_input(ifp, m); 2013 RELEASE_GLOBAL_LOCKS(); 2014 return; 2015 } 2016 2017 bound = curlwp_bind(); 2018 bif = bridge_lookup_member_if(sc, ifp, &psref); 2019 if (bif == NULL) { 2020 curlwp_bindx(bound); 2021 ACQUIRE_GLOBAL_LOCKS(); 2022 ether_input(ifp, m); 2023 RELEASE_GLOBAL_LOCKS(); 2024 return; 2025 } 2026 2027 eh = mtod(m, struct ether_header *); 2028 2029 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 2030 if (memcmp(etherbroadcastaddr, 2031 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 2032 m->m_flags |= M_BCAST; 2033 else 2034 m->m_flags |= M_MCAST; 2035 } 2036 2037 /* 2038 * A 'fast' path for packets addressed to interfaces that are 2039 * part of this bridge. 2040 */ 2041 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 2042 !bstp_state_before_learning(bif)) { 2043 struct bridge_iflist *_bif; 2044 struct ifnet *_ifp = NULL; 2045 int s; 2046 struct psref _psref; 2047 2048 s = pserialize_read_enter(); 2049 BRIDGE_IFLIST_READER_FOREACH(_bif, sc) { 2050 /* It is destined for us. */ 2051 if (bridge_ourether(_bif, eh, 0)) { 2052 bridge_acquire_member(sc, _bif, &_psref); 2053 pserialize_read_exit(s); 2054 if (_bif->bif_flags & IFBIF_LEARNING) 2055 (void) bridge_rtupdate(sc, 2056 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 2057 m_set_rcvif(m, _bif->bif_ifp); 2058 _ifp = _bif->bif_ifp; 2059 bridge_release_member(sc, _bif, &_psref); 2060 goto out; 2061 } 2062 2063 /* We just received a packet that we sent out. */ 2064 if (bridge_ourether(_bif, eh, 1)) 2065 break; 2066 } 2067 pserialize_read_exit(s); 2068 out: 2069 2070 if (_bif != NULL) { 2071 bridge_release_member(sc, bif, &psref); 2072 curlwp_bindx(bound); 2073 if (_ifp != NULL) { 2074 m->m_flags &= ~M_PROMISC; 2075 ACQUIRE_GLOBAL_LOCKS(); 2076 ether_input(_ifp, m); 2077 RELEASE_GLOBAL_LOCKS(); 2078 } else 2079 m_freem(m); 2080 return; 2081 } 2082 } 2083 2084 /* Tap off 802.1D packets; they do not get forwarded. */ 2085 if (bif->bif_flags & IFBIF_STP && 2086 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 2087 bstp_input(sc, bif, m); 2088 bridge_release_member(sc, bif, &psref); 2089 curlwp_bindx(bound); 2090 return; 2091 } 2092 2093 /* 2094 * A normal switch would discard the packet here, but that's not what 2095 * we've done historically. This also prevents some obnoxious behaviour. 2096 */ 2097 if (bstp_state_before_learning(bif)) { 2098 bridge_release_member(sc, bif, &psref); 2099 curlwp_bindx(bound); 2100 ACQUIRE_GLOBAL_LOCKS(); 2101 ether_input(ifp, m); 2102 RELEASE_GLOBAL_LOCKS(); 2103 return; 2104 } 2105 2106 bridge_release_member(sc, bif, &psref); 2107 2108 bridge_forward(sc, m); 2109 2110 curlwp_bindx(bound); 2111 } 2112 2113 /* 2114 * bridge_broadcast: 2115 * 2116 * Send a frame to all interfaces that are members of 2117 * the bridge, except for the one on which the packet 2118 * arrived. 2119 */ 2120 static void 2121 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2122 bool src_if_protected, struct mbuf *m) 2123 { 2124 struct bridge_iflist *bif; 2125 struct mbuf *mc; 2126 struct ifnet *dst_if; 2127 bool bmcast; 2128 int s; 2129 DECLARE_LOCK_VARIABLE; 2130 2131 bmcast = m->m_flags & (M_BCAST|M_MCAST); 2132 2133 s = pserialize_read_enter(); 2134 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 2135 struct psref psref; 2136 2137 bridge_acquire_member(sc, bif, &psref); 2138 pserialize_read_exit(s); 2139 2140 dst_if = bif->bif_ifp; 2141 2142 if (bif->bif_flags & IFBIF_STP) { 2143 switch (bif->bif_state) { 2144 case BSTP_IFSTATE_BLOCKING: 2145 case BSTP_IFSTATE_DISABLED: 2146 goto next; 2147 } 2148 } 2149 2150 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 2151 goto next; 2152 2153 if ((dst_if->if_flags & IFF_RUNNING) == 0) 2154 goto next; 2155 2156 if (dst_if != src_if) { 2157 if ((bif->bif_flags & IFBIF_PROTECTED) && 2158 src_if_protected) { 2159 goto next; 2160 } 2161 2162 mc = m_copypacket(m, M_DONTWAIT); 2163 if (mc == NULL) { 2164 if_statinc(&sc->sc_if, if_oerrors); 2165 goto next; 2166 } 2167 /* 2168 * Before enqueueing this packet to the destination 2169 * interface, clear any in-bound checksum flags to 2170 * prevent them from being misused as out-bound flags. 2171 */ 2172 mc->m_pkthdr.csum_flags = 0; 2173 2174 ACQUIRE_GLOBAL_LOCKS(); 2175 bridge_enqueue(sc, dst_if, mc, 1); 2176 RELEASE_GLOBAL_LOCKS(); 2177 } 2178 2179 if (bmcast) { 2180 mc = m_copypacket(m, M_DONTWAIT); 2181 if (mc == NULL) { 2182 if_statinc(&sc->sc_if, if_oerrors); 2183 goto next; 2184 } 2185 /* 2186 * Before enqueueing this packet to the destination 2187 * interface, clear any in-bound checksum flags to 2188 * prevent them from being misused as out-bound flags. 2189 */ 2190 mc->m_pkthdr.csum_flags = 0; 2191 2192 m_set_rcvif(mc, dst_if); 2193 mc->m_flags &= ~M_PROMISC; 2194 2195 ACQUIRE_GLOBAL_LOCKS(); 2196 ether_input(dst_if, mc); 2197 RELEASE_GLOBAL_LOCKS(); 2198 } 2199 next: 2200 s = pserialize_read_enter(); 2201 bridge_release_member(sc, bif, &psref); 2202 } 2203 pserialize_read_exit(s); 2204 2205 m_freem(m); 2206 } 2207 2208 static int 2209 bridge_rtalloc(struct bridge_softc *sc, const uint8_t *dst, 2210 struct bridge_rtnode **brtp) 2211 { 2212 struct bridge_rtnode *brt; 2213 int error; 2214 2215 if (sc->sc_brtcnt >= sc->sc_brtmax) 2216 return ENOSPC; 2217 2218 /* 2219 * Allocate a new bridge forwarding node, and 2220 * initialize the expiration time and Ethernet 2221 * address. 2222 */ 2223 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 2224 if (brt == NULL) 2225 return ENOMEM; 2226 2227 memset(brt, 0, sizeof(*brt)); 2228 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2229 brt->brt_flags = IFBAF_DYNAMIC; 2230 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2231 PSLIST_ENTRY_INIT(brt, brt_list); 2232 PSLIST_ENTRY_INIT(brt, brt_hash); 2233 2234 BRIDGE_RT_LOCK(sc); 2235 error = bridge_rtnode_insert(sc, brt); 2236 BRIDGE_RT_UNLOCK(sc); 2237 2238 if (error != 0) { 2239 pool_put(&bridge_rtnode_pool, brt); 2240 return error; 2241 } 2242 2243 *brtp = brt; 2244 return 0; 2245 } 2246 2247 /* 2248 * bridge_rtupdate: 2249 * 2250 * Add a bridge routing entry. 2251 */ 2252 static int 2253 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 2254 struct ifnet *dst_if, int setflags, uint8_t flags) 2255 { 2256 struct bridge_rtnode *brt; 2257 int s; 2258 2259 again: 2260 /* 2261 * A route for this destination might already exist. If so, 2262 * update it, otherwise create a new one. 2263 */ 2264 s = pserialize_read_enter(); 2265 brt = bridge_rtnode_lookup(sc, dst); 2266 2267 if (brt != NULL) { 2268 brt->brt_ifp = dst_if; 2269 if (setflags) { 2270 brt->brt_flags = flags; 2271 if (flags & IFBAF_STATIC) 2272 brt->brt_expire = 0; 2273 else 2274 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2275 } else { 2276 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2277 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2278 } 2279 } 2280 pserialize_read_exit(s); 2281 2282 if (brt == NULL) { 2283 int r; 2284 2285 r = bridge_rtalloc(sc, dst, &brt); 2286 if (r != 0) 2287 return r; 2288 goto again; 2289 } 2290 2291 return 0; 2292 } 2293 2294 /* 2295 * bridge_rtlookup: 2296 * 2297 * Lookup the destination interface for an address. 2298 */ 2299 static struct ifnet * 2300 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2301 { 2302 struct bridge_rtnode *brt; 2303 struct ifnet *ifs = NULL; 2304 int s; 2305 2306 s = pserialize_read_enter(); 2307 brt = bridge_rtnode_lookup(sc, addr); 2308 if (brt != NULL) 2309 ifs = brt->brt_ifp; 2310 pserialize_read_exit(s); 2311 2312 return ifs; 2313 } 2314 2315 typedef bool (*bridge_iterate_cb_t) 2316 (struct bridge_softc *, struct bridge_rtnode *, bool *, void *); 2317 2318 /* 2319 * bridge_rtlist_iterate_remove: 2320 * 2321 * It iterates on sc->sc_rtlist and removes rtnodes of it which func 2322 * callback judges to remove. Removals of rtnodes are done in a manner 2323 * of pserialize. To this end, all kmem_* operations are placed out of 2324 * mutexes. 2325 */ 2326 static void 2327 bridge_rtlist_iterate_remove(struct bridge_softc *sc, bridge_iterate_cb_t func, void *arg) 2328 { 2329 struct bridge_rtnode *brt; 2330 struct bridge_rtnode **brt_list; 2331 int i, count; 2332 2333 retry: 2334 count = sc->sc_brtcnt; 2335 if (count == 0) 2336 return; 2337 brt_list = kmem_alloc(sizeof(*brt_list) * count, KM_SLEEP); 2338 2339 BRIDGE_RT_LOCK(sc); 2340 if (__predict_false(sc->sc_brtcnt > count)) { 2341 /* The rtnodes increased, we need more memory */ 2342 BRIDGE_RT_UNLOCK(sc); 2343 kmem_free(brt_list, sizeof(*brt_list) * count); 2344 goto retry; 2345 } 2346 2347 i = 0; 2348 /* 2349 * We don't need to use a _SAFE variant here because we know 2350 * that a removed item keeps its next pointer as-is thanks to 2351 * pslist(9) and isn't freed in the loop. 2352 */ 2353 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 2354 bool need_break = false; 2355 if (func(sc, brt, &need_break, arg)) { 2356 bridge_rtnode_remove(sc, brt); 2357 brt_list[i++] = brt; 2358 } 2359 if (need_break) 2360 break; 2361 } 2362 2363 if (i > 0) 2364 BRIDGE_RT_PSZ_PERFORM(sc); 2365 BRIDGE_RT_UNLOCK(sc); 2366 2367 while (--i >= 0) 2368 bridge_rtnode_destroy(brt_list[i]); 2369 2370 kmem_free(brt_list, sizeof(*brt_list) * count); 2371 } 2372 2373 static bool 2374 bridge_rttrim0_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2375 bool *need_break, void *arg) 2376 { 2377 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2378 /* Take into account of the subsequent removal */ 2379 if ((sc->sc_brtcnt - 1) <= sc->sc_brtmax) 2380 *need_break = true; 2381 return true; 2382 } else 2383 return false; 2384 } 2385 2386 static void 2387 bridge_rttrim0(struct bridge_softc *sc) 2388 { 2389 bridge_rtlist_iterate_remove(sc, bridge_rttrim0_cb, NULL); 2390 } 2391 2392 /* 2393 * bridge_rttrim: 2394 * 2395 * Trim the routine table so that we have a number 2396 * of routing entries less than or equal to the 2397 * maximum number. 2398 */ 2399 static void 2400 bridge_rttrim(struct bridge_softc *sc) 2401 { 2402 2403 /* Make sure we actually need to do this. */ 2404 if (sc->sc_brtcnt <= sc->sc_brtmax) 2405 return; 2406 2407 /* Force an aging cycle; this might trim enough addresses. */ 2408 bridge_rtage(sc); 2409 if (sc->sc_brtcnt <= sc->sc_brtmax) 2410 return; 2411 2412 bridge_rttrim0(sc); 2413 2414 return; 2415 } 2416 2417 /* 2418 * bridge_timer: 2419 * 2420 * Aging timer for the bridge. 2421 */ 2422 static void 2423 bridge_timer(void *arg) 2424 { 2425 struct bridge_softc *sc = arg; 2426 2427 workqueue_enqueue(sc->sc_rtage_wq, &sc->sc_rtage_wk, NULL); 2428 } 2429 2430 static void 2431 bridge_rtage_work(struct work *wk, void *arg) 2432 { 2433 struct bridge_softc *sc = arg; 2434 2435 KASSERT(wk == &sc->sc_rtage_wk); 2436 2437 bridge_rtage(sc); 2438 2439 BRIDGE_LOCK(sc); 2440 if (!sc->sc_stopping) { 2441 callout_reset(&sc->sc_brcallout, 2442 bridge_rtable_prune_period * hz, bridge_timer, sc); 2443 } 2444 BRIDGE_UNLOCK(sc); 2445 } 2446 2447 static bool 2448 bridge_rtage_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2449 bool *need_break, void *arg) 2450 { 2451 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2452 time_uptime >= brt->brt_expire) 2453 return true; 2454 else 2455 return false; 2456 } 2457 2458 /* 2459 * bridge_rtage: 2460 * 2461 * Perform an aging cycle. 2462 */ 2463 static void 2464 bridge_rtage(struct bridge_softc *sc) 2465 { 2466 bridge_rtlist_iterate_remove(sc, bridge_rtage_cb, NULL); 2467 } 2468 2469 2470 static bool 2471 bridge_rtflush_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2472 bool *need_break, void *arg) 2473 { 2474 int full = *(int*)arg; 2475 2476 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2477 return true; 2478 else 2479 return false; 2480 } 2481 2482 /* 2483 * bridge_rtflush: 2484 * 2485 * Remove all dynamic addresses from the bridge. 2486 */ 2487 static void 2488 bridge_rtflush(struct bridge_softc *sc, int full) 2489 { 2490 bridge_rtlist_iterate_remove(sc, bridge_rtflush_cb, &full); 2491 } 2492 2493 /* 2494 * bridge_rtdaddr: 2495 * 2496 * Remove an address from the table. 2497 */ 2498 static int 2499 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2500 { 2501 struct bridge_rtnode *brt; 2502 2503 BRIDGE_RT_LOCK(sc); 2504 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2505 BRIDGE_RT_UNLOCK(sc); 2506 return ENOENT; 2507 } 2508 bridge_rtnode_remove(sc, brt); 2509 BRIDGE_RT_PSZ_PERFORM(sc); 2510 BRIDGE_RT_UNLOCK(sc); 2511 2512 bridge_rtnode_destroy(brt); 2513 2514 return 0; 2515 } 2516 2517 /* 2518 * bridge_rtdelete: 2519 * 2520 * Delete routes to a speicifc member interface. 2521 */ 2522 static void 2523 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2524 { 2525 struct bridge_rtnode *brt; 2526 2527 /* XXX pserialize_perform for each entry is slow */ 2528 again: 2529 BRIDGE_RT_LOCK(sc); 2530 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 2531 if (brt->brt_ifp == ifp) 2532 break; 2533 } 2534 if (brt == NULL) { 2535 BRIDGE_RT_UNLOCK(sc); 2536 return; 2537 } 2538 bridge_rtnode_remove(sc, brt); 2539 BRIDGE_RT_PSZ_PERFORM(sc); 2540 BRIDGE_RT_UNLOCK(sc); 2541 2542 bridge_rtnode_destroy(brt); 2543 2544 goto again; 2545 } 2546 2547 /* 2548 * bridge_rtable_init: 2549 * 2550 * Initialize the route table for this bridge. 2551 */ 2552 static void 2553 bridge_rtable_init(struct bridge_softc *sc) 2554 { 2555 int i; 2556 2557 sc->sc_rthash = kmem_alloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2558 KM_SLEEP); 2559 2560 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2561 PSLIST_INIT(&sc->sc_rthash[i]); 2562 2563 sc->sc_rthash_key = cprng_fast32(); 2564 2565 PSLIST_INIT(&sc->sc_rtlist); 2566 2567 sc->sc_rtlist_psz = pserialize_create(); 2568 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 2569 } 2570 2571 /* 2572 * bridge_rtable_fini: 2573 * 2574 * Deconstruct the route table for this bridge. 2575 */ 2576 static void 2577 bridge_rtable_fini(struct bridge_softc *sc) 2578 { 2579 2580 kmem_free(sc->sc_rthash, sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE); 2581 mutex_obj_free(sc->sc_rtlist_lock); 2582 pserialize_destroy(sc->sc_rtlist_psz); 2583 } 2584 2585 /* 2586 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2587 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2588 */ 2589 #define mix(a, b, c) \ 2590 do { \ 2591 a -= b; a -= c; a ^= (c >> 13); \ 2592 b -= c; b -= a; b ^= (a << 8); \ 2593 c -= a; c -= b; c ^= (b >> 13); \ 2594 a -= b; a -= c; a ^= (c >> 12); \ 2595 b -= c; b -= a; b ^= (a << 16); \ 2596 c -= a; c -= b; c ^= (b >> 5); \ 2597 a -= b; a -= c; a ^= (c >> 3); \ 2598 b -= c; b -= a; b ^= (a << 10); \ 2599 c -= a; c -= b; c ^= (b >> 15); \ 2600 } while (/*CONSTCOND*/0) 2601 2602 static inline uint32_t 2603 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2604 { 2605 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2606 2607 b += addr[5] << 8; 2608 b += addr[4]; 2609 a += (uint32_t)addr[3] << 24; 2610 a += addr[2] << 16; 2611 a += addr[1] << 8; 2612 a += addr[0]; 2613 2614 mix(a, b, c); 2615 2616 return (c & BRIDGE_RTHASH_MASK); 2617 } 2618 2619 #undef mix 2620 2621 /* 2622 * bridge_rtnode_lookup: 2623 * 2624 * Look up a bridge route node for the specified destination. 2625 */ 2626 static struct bridge_rtnode * 2627 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2628 { 2629 struct bridge_rtnode *brt; 2630 uint32_t hash; 2631 int dir; 2632 2633 hash = bridge_rthash(sc, addr); 2634 BRIDGE_RTHASH_READER_FOREACH(brt, sc, hash) { 2635 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2636 if (dir == 0) 2637 return brt; 2638 if (dir > 0) 2639 return NULL; 2640 } 2641 2642 return NULL; 2643 } 2644 2645 /* 2646 * bridge_rtnode_insert: 2647 * 2648 * Insert the specified bridge node into the route table. We 2649 * assume the entry is not already in the table. 2650 */ 2651 static int 2652 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2653 { 2654 struct bridge_rtnode *lbrt, *prev = NULL; 2655 uint32_t hash; 2656 2657 KASSERT(BRIDGE_RT_LOCKED(sc)); 2658 2659 hash = bridge_rthash(sc, brt->brt_addr); 2660 BRIDGE_RTHASH_WRITER_FOREACH(lbrt, sc, hash) { 2661 int dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2662 if (dir == 0) 2663 return EEXIST; 2664 if (dir > 0) 2665 break; 2666 prev = lbrt; 2667 } 2668 if (prev == NULL) 2669 BRIDGE_RTHASH_WRITER_INSERT_HEAD(sc, hash, brt); 2670 else 2671 BRIDGE_RTHASH_WRITER_INSERT_AFTER(prev, brt); 2672 2673 BRIDGE_RTLIST_WRITER_INSERT_HEAD(sc, brt); 2674 sc->sc_brtcnt++; 2675 2676 return 0; 2677 } 2678 2679 /* 2680 * bridge_rtnode_remove: 2681 * 2682 * Remove a bridge rtnode from the rthash and the rtlist of a bridge. 2683 */ 2684 static void 2685 bridge_rtnode_remove(struct bridge_softc *sc, struct bridge_rtnode *brt) 2686 { 2687 2688 KASSERT(BRIDGE_RT_LOCKED(sc)); 2689 2690 BRIDGE_RTHASH_WRITER_REMOVE(brt); 2691 BRIDGE_RTLIST_WRITER_REMOVE(brt); 2692 sc->sc_brtcnt--; 2693 } 2694 2695 /* 2696 * bridge_rtnode_destroy: 2697 * 2698 * Destroy a bridge rtnode. 2699 */ 2700 static void 2701 bridge_rtnode_destroy(struct bridge_rtnode *brt) 2702 { 2703 2704 PSLIST_ENTRY_DESTROY(brt, brt_list); 2705 PSLIST_ENTRY_DESTROY(brt, brt_hash); 2706 pool_put(&bridge_rtnode_pool, brt); 2707 } 2708 2709 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2710 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2711 2712 /* 2713 * Send bridge packets through IPF if they are one of the types IPF can deal 2714 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2715 * question.) 2716 */ 2717 static int 2718 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2719 { 2720 int snap, error; 2721 struct ether_header *eh1, eh2; 2722 struct llc llc1; 2723 uint16_t ether_type; 2724 2725 snap = 0; 2726 error = -1; /* Default error if not error == 0 */ 2727 eh1 = mtod(*mp, struct ether_header *); 2728 ether_type = ntohs(eh1->ether_type); 2729 2730 /* 2731 * Check for SNAP/LLC. 2732 */ 2733 if (ether_type < ETHERMTU) { 2734 struct llc *llc2 = (struct llc *)(eh1 + 1); 2735 2736 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2737 llc2->llc_dsap == LLC_SNAP_LSAP && 2738 llc2->llc_ssap == LLC_SNAP_LSAP && 2739 llc2->llc_control == LLC_UI) { 2740 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2741 snap = 1; 2742 } 2743 } 2744 2745 /* drop VLAN traffic untagged by hardware offloading */ 2746 if (vlan_has_tag(*mp)) 2747 goto bad; 2748 2749 /* 2750 * If we're trying to filter bridge traffic, don't look at anything 2751 * other than IP and ARP traffic. If the filter doesn't understand 2752 * IPv6, don't allow IPv6 through the bridge either. This is lame 2753 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2754 * but of course we don't have an AppleTalk filter to begin with. 2755 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2756 * ARP traffic.) 2757 */ 2758 switch (ether_type) { 2759 case ETHERTYPE_ARP: 2760 case ETHERTYPE_REVARP: 2761 return 0; /* Automatically pass */ 2762 case ETHERTYPE_IP: 2763 # ifdef INET6 2764 case ETHERTYPE_IPV6: 2765 # endif /* INET6 */ 2766 break; 2767 default: 2768 goto bad; 2769 } 2770 2771 /* Strip off the Ethernet header and keep a copy. */ 2772 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2773 m_adj(*mp, ETHER_HDR_LEN); 2774 2775 /* Strip off snap header, if present */ 2776 if (snap) { 2777 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2778 m_adj(*mp, sizeof(struct llc)); 2779 } 2780 2781 /* 2782 * Check basic packet sanity and run IPF through pfil. 2783 */ 2784 KASSERT(!cpu_intr_p()); 2785 switch (ether_type) 2786 { 2787 case ETHERTYPE_IP : 2788 error = bridge_ip_checkbasic(mp); 2789 if (error == 0) 2790 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2791 break; 2792 # ifdef INET6 2793 case ETHERTYPE_IPV6 : 2794 error = bridge_ip6_checkbasic(mp); 2795 if (error == 0) 2796 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2797 break; 2798 # endif 2799 default : 2800 error = 0; 2801 break; 2802 } 2803 2804 if (*mp == NULL) 2805 return error; 2806 if (error != 0) 2807 goto bad; 2808 2809 error = -1; 2810 2811 /* 2812 * Finally, put everything back the way it was and return 2813 */ 2814 if (snap) { 2815 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2816 if (*mp == NULL) 2817 return error; 2818 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2819 } 2820 2821 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2822 if (*mp == NULL) 2823 return error; 2824 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2825 2826 return 0; 2827 2828 bad: 2829 m_freem(*mp); 2830 *mp = NULL; 2831 return error; 2832 } 2833 2834 /* 2835 * Perform basic checks on header size since 2836 * IPF assumes ip_input has already processed 2837 * it for it. Cut-and-pasted from ip_input.c. 2838 * Given how simple the IPv6 version is, 2839 * does the IPv4 version really need to be 2840 * this complicated? 2841 * 2842 * XXX Should we update ipstat here, or not? 2843 * XXX Right now we update ipstat but not 2844 * XXX csum_counter. 2845 */ 2846 static int 2847 bridge_ip_checkbasic(struct mbuf **mp) 2848 { 2849 struct mbuf *m = *mp; 2850 struct ip *ip; 2851 int len, hlen; 2852 2853 if (*mp == NULL) 2854 return -1; 2855 2856 if (M_GET_ALIGNED_HDR(&m, struct ip, true) != 0) { 2857 /* XXXJRT new stat, please */ 2858 ip_statinc(IP_STAT_TOOSMALL); 2859 goto bad; 2860 } 2861 ip = mtod(m, struct ip *); 2862 if (ip == NULL) goto bad; 2863 2864 if (ip->ip_v != IPVERSION) { 2865 ip_statinc(IP_STAT_BADVERS); 2866 goto bad; 2867 } 2868 hlen = ip->ip_hl << 2; 2869 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2870 ip_statinc(IP_STAT_BADHLEN); 2871 goto bad; 2872 } 2873 if (hlen > m->m_len) { 2874 if ((m = m_pullup(m, hlen)) == 0) { 2875 ip_statinc(IP_STAT_BADHLEN); 2876 goto bad; 2877 } 2878 ip = mtod(m, struct ip *); 2879 if (ip == NULL) goto bad; 2880 } 2881 2882 switch (m->m_pkthdr.csum_flags & 2883 ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_IPv4) | 2884 M_CSUM_IPv4_BAD)) { 2885 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2886 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2887 goto bad; 2888 2889 case M_CSUM_IPv4: 2890 /* Checksum was okay. */ 2891 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2892 break; 2893 2894 default: 2895 /* Must compute it ourselves. */ 2896 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2897 if (in_cksum(m, hlen) != 0) 2898 goto bad; 2899 break; 2900 } 2901 2902 /* Retrieve the packet length. */ 2903 len = ntohs(ip->ip_len); 2904 2905 /* 2906 * Check for additional length bogosity 2907 */ 2908 if (len < hlen) { 2909 ip_statinc(IP_STAT_BADLEN); 2910 goto bad; 2911 } 2912 2913 /* 2914 * Check that the amount of data in the buffers 2915 * is as at least much as the IP header would have us expect. 2916 * Drop packet if shorter than we expect. 2917 */ 2918 if (m->m_pkthdr.len < len) { 2919 ip_statinc(IP_STAT_TOOSHORT); 2920 goto bad; 2921 } 2922 2923 /* Checks out, proceed */ 2924 *mp = m; 2925 return 0; 2926 2927 bad: 2928 *mp = m; 2929 return -1; 2930 } 2931 2932 # ifdef INET6 2933 /* 2934 * Same as above, but for IPv6. 2935 * Cut-and-pasted from ip6_input.c. 2936 * XXX Should we update ip6stat, or not? 2937 */ 2938 static int 2939 bridge_ip6_checkbasic(struct mbuf **mp) 2940 { 2941 struct mbuf *m = *mp; 2942 struct ip6_hdr *ip6; 2943 2944 /* 2945 * If the IPv6 header is not aligned, slurp it up into a new 2946 * mbuf with space for link headers, in the event we forward 2947 * it. Otherwise, if it is aligned, make sure the entire base 2948 * IPv6 header is in the first mbuf of the chain. 2949 */ 2950 if (M_GET_ALIGNED_HDR(&m, struct ip6_hdr, true) != 0) { 2951 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2952 /* XXXJRT new stat, please */ 2953 ip6_statinc(IP6_STAT_TOOSMALL); 2954 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2955 goto bad; 2956 } 2957 2958 ip6 = mtod(m, struct ip6_hdr *); 2959 2960 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2961 ip6_statinc(IP6_STAT_BADVERS); 2962 in6_ifstat_inc(m_get_rcvif_NOMPSAFE(m), ifs6_in_hdrerr); 2963 goto bad; 2964 } 2965 2966 /* Checks out, proceed */ 2967 *mp = m; 2968 return 0; 2969 2970 bad: 2971 *mp = m; 2972 return -1; 2973 } 2974 # endif /* INET6 */ 2975
Indexes created Sat Sep 20 22:09:52 GMT 2025