if_bridge.c revision 1.196
1 /* $NetBSD: if_bridge.c,v 1.196 2024/12/16 05:21:24 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 1.196 2024/12/16 05:21:24 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 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1451 bridge_timer, sc); 1452 bstp_initialization(sc); 1453 1454 ifp->if_flags |= IFF_RUNNING; 1455 return 0; 1456 } 1457 1458 /* 1459 * bridge_stop: 1460 * 1461 * Stop the bridge interface. 1462 */ 1463 static void 1464 bridge_stop(struct ifnet *ifp, int disable) 1465 { 1466 struct bridge_softc *sc = ifp->if_softc; 1467 1468 KASSERT((ifp->if_flags & IFF_RUNNING) != 0); 1469 ifp->if_flags &= ~IFF_RUNNING; 1470 1471 callout_halt(&sc->sc_brcallout, NULL); 1472 workqueue_wait(sc->sc_rtage_wq, &sc->sc_rtage_wk); 1473 bstp_stop(sc); 1474 bridge_rtflush(sc, IFBF_FLUSHDYN); 1475 } 1476 1477 /* 1478 * bridge_enqueue: 1479 * 1480 * Enqueue a packet on a bridge member interface. 1481 */ 1482 void 1483 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1484 int runfilt) 1485 { 1486 int len, error; 1487 short mflags; 1488 1489 if (runfilt) { 1490 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1491 dst_ifp, PFIL_OUT) != 0) { 1492 m_freem(m); 1493 return; 1494 } 1495 if (m == NULL) 1496 return; 1497 } 1498 1499 #ifdef ALTQ 1500 KERNEL_LOCK(1, NULL); 1501 /* 1502 * If ALTQ is enabled on the member interface, do 1503 * classification; the queueing discipline might 1504 * not require classification, but might require 1505 * the address family/header pointer in the pktattr. 1506 */ 1507 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1508 /* XXX IFT_ETHER */ 1509 altq_etherclassify(&dst_ifp->if_snd, m); 1510 } 1511 KERNEL_UNLOCK_ONE(NULL); 1512 #endif /* ALTQ */ 1513 1514 if (vlan_has_tag(m) && 1515 !vlan_is_hwtag_enabled(dst_ifp)) { 1516 (void)ether_inject_vlantag(&m, ETHERTYPE_VLAN, 1517 vlan_get_tag(m)); 1518 if (m == NULL) { 1519 if_statinc(&sc->sc_if, if_oerrors); 1520 return; 1521 } 1522 } 1523 1524 len = m->m_pkthdr.len; 1525 mflags = m->m_flags; 1526 1527 error = if_transmit_lock(dst_ifp, m); 1528 if (error) { 1529 /* mbuf is already freed */ 1530 if_statinc(&sc->sc_if, if_oerrors); 1531 return; 1532 } 1533 1534 net_stat_ref_t nsr = IF_STAT_GETREF(&sc->sc_if); 1535 if_statinc_ref(&sc->sc_if, nsr, if_opackets); 1536 if_statadd_ref(&sc->sc_if, nsr, if_obytes, len); 1537 if (mflags & M_MCAST) 1538 if_statinc_ref(&sc->sc_if, nsr, if_omcasts); 1539 IF_STAT_PUTREF(&sc->sc_if); 1540 } 1541 1542 /* 1543 * bridge_output: 1544 * 1545 * Send output from a bridge member interface. This 1546 * performs the bridging function for locally originated 1547 * packets. 1548 * 1549 * The mbuf has the Ethernet header already attached. We must 1550 * enqueue or free the mbuf before returning. 1551 */ 1552 int 1553 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1554 const struct rtentry *rt) 1555 { 1556 struct ether_header *eh; 1557 struct ifnet *dst_if; 1558 struct bridge_softc *sc; 1559 struct mbuf *n; 1560 int s, bound; 1561 1562 /* 1563 * bridge_output() is called from ether_output(), furthermore 1564 * ifp argument doesn't point to bridge(4). So, don't assert 1565 * IFEF_MPSAFE here. 1566 */ 1567 1568 KASSERT(m->m_len >= ETHER_HDR_LEN); 1569 1570 eh = mtod(m, struct ether_header *); 1571 sc = ifp->if_bridge; 1572 1573 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1574 if (memcmp(etherbroadcastaddr, 1575 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1576 m->m_flags |= M_BCAST; 1577 else 1578 m->m_flags |= M_MCAST; 1579 } 1580 1581 /* 1582 * If bridge is down, but the original output interface is up, 1583 * go ahead and send out that interface. Otherwise, the packet 1584 * is dropped below. 1585 */ 1586 if (__predict_false(sc == NULL) || 1587 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1588 dst_if = ifp; 1589 goto unicast_asis; 1590 } 1591 1592 /* 1593 * If the packet is a multicast, or we don't know a better way to 1594 * get there, send to all interfaces. 1595 */ 1596 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0) 1597 dst_if = NULL; 1598 else 1599 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1600 1601 /* 1602 * In general, we need to handle TX offload in software before 1603 * enqueueing a packet. However, we can send it as is in the 1604 * cases of unicast via (1) the source interface, or (2) an 1605 * interface which supports the specified offload options. 1606 * For multicast or broadcast, send it as is only if (3) all 1607 * the member interfaces support the specified options. 1608 */ 1609 1610 /* 1611 * Unicast via the source interface. 1612 */ 1613 if (dst_if == ifp) 1614 goto unicast_asis; 1615 1616 /* 1617 * Unicast via other interface. 1618 */ 1619 if (dst_if != NULL) { 1620 KASSERT(m->m_flags & M_PKTHDR); 1621 if (TX_OFFLOAD_SUPPORTED(dst_if->if_csum_flags_tx, 1622 m->m_pkthdr.csum_flags)) { 1623 /* 1624 * Unicast via an interface which supports the 1625 * specified offload options. 1626 */ 1627 goto unicast_asis; 1628 } 1629 1630 /* 1631 * Handle TX offload in software. For TSO, a packet is 1632 * split into multiple chunks. Thus, the return value of 1633 * ether_sw_offload_tx() is mbuf queue consists of them. 1634 */ 1635 m = ether_sw_offload_tx(ifp, m); 1636 if (m == NULL) 1637 return 0; 1638 1639 do { 1640 n = m->m_nextpkt; 1641 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1642 m_freem(m); 1643 else 1644 bridge_enqueue(sc, dst_if, m, 0); 1645 m = n; 1646 } while (m != NULL); 1647 1648 return 0; 1649 } 1650 1651 /* 1652 * Multicast or broadcast. 1653 */ 1654 if (TX_OFFLOAD_SUPPORTED(sc->sc_csum_flags_tx, 1655 m->m_pkthdr.csum_flags)) { 1656 /* 1657 * Specified TX offload options are supported by all 1658 * the member interfaces of this bridge. 1659 */ 1660 m->m_nextpkt = NULL; /* XXX */ 1661 } else { 1662 /* 1663 * Otherwise, handle TX offload in software. 1664 */ 1665 m = ether_sw_offload_tx(ifp, m); 1666 if (m == NULL) 1667 return 0; 1668 } 1669 1670 /* 1671 * When we use pppoe over bridge, bridge_output() can be called 1672 * in a lwp context by pppoe_timeout_wk(). 1673 */ 1674 bound = curlwp_bind(); 1675 do { 1676 /* XXX Should call bridge_broadcast, but there are locking 1677 * issues which need resolving first. */ 1678 struct bridge_iflist *bif; 1679 struct mbuf *mc; 1680 bool used = false; 1681 1682 n = m->m_nextpkt; 1683 1684 s = pserialize_read_enter(); 1685 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1686 struct psref psref; 1687 1688 bridge_acquire_member(sc, bif, &psref); 1689 pserialize_read_exit(s); 1690 1691 dst_if = bif->bif_ifp; 1692 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1693 goto next; 1694 1695 /* 1696 * If this is not the original output interface, 1697 * and the interface is participating in spanning 1698 * tree, make sure the port is in a state that 1699 * allows forwarding. 1700 */ 1701 if (dst_if != ifp && 1702 (bif->bif_flags & IFBIF_STP) != 0) { 1703 switch (bif->bif_state) { 1704 case BSTP_IFSTATE_BLOCKING: 1705 case BSTP_IFSTATE_LISTENING: 1706 case BSTP_IFSTATE_DISABLED: 1707 goto next; 1708 } 1709 } 1710 1711 if (PSLIST_READER_NEXT(bif, struct bridge_iflist, 1712 bif_next) == NULL && 1713 ((m->m_flags & (M_MCAST | M_BCAST)) == 0 || 1714 dst_if == ifp)) 1715 { 1716 used = true; 1717 mc = m; 1718 } else { 1719 mc = m_copypacket(m, M_DONTWAIT); 1720 if (mc == NULL) { 1721 if_statinc(&sc->sc_if, if_oerrors); 1722 goto next; 1723 } 1724 } 1725 1726 bridge_enqueue(sc, dst_if, mc, 0); 1727 1728 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0 && 1729 dst_if != ifp) 1730 { 1731 if (PSLIST_READER_NEXT(bif, 1732 struct bridge_iflist, bif_next) == NULL) 1733 { 1734 used = true; 1735 mc = m; 1736 } else { 1737 mc = m_copypacket(m, M_DONTWAIT); 1738 if (mc == NULL) { 1739 if_statinc(&sc->sc_if, 1740 if_oerrors); 1741 goto next; 1742 } 1743 } 1744 1745 m_set_rcvif(mc, dst_if); 1746 mc->m_flags &= ~M_PROMISC; 1747 1748 const int _s = splsoftnet(); 1749 KERNEL_LOCK_UNLESS_IFP_MPSAFE(dst_if); 1750 ether_input(dst_if, mc); 1751 KERNEL_UNLOCK_UNLESS_IFP_MPSAFE(dst_if); 1752 splx(_s); 1753 } 1754 1755 next: 1756 s = pserialize_read_enter(); 1757 bridge_release_member(sc, bif, &psref); 1758 1759 /* Guarantee we don't re-enter the loop as we already 1760 * decided we're at the end. */ 1761 if (used) 1762 break; 1763 } 1764 pserialize_read_exit(s); 1765 1766 if (!used) 1767 m_freem(m); 1768 1769 m = n; 1770 } while (m != NULL); 1771 curlwp_bindx(bound); 1772 1773 return 0; 1774 1775 unicast_asis: 1776 /* 1777 * XXX Spanning tree consideration here? 1778 */ 1779 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1780 m_freem(m); 1781 else 1782 bridge_enqueue(sc, dst_if, m, 0); 1783 return 0; 1784 } 1785 1786 /* 1787 * bridge_start: 1788 * 1789 * Start output on a bridge. 1790 * 1791 * NOTE: This routine should never be called in this implementation. 1792 */ 1793 static void 1794 bridge_start(struct ifnet *ifp) 1795 { 1796 1797 printf("%s: bridge_start() called\n", ifp->if_xname); 1798 } 1799 1800 /* 1801 * bridge_forward: 1802 * 1803 * The forwarding function of the bridge. 1804 */ 1805 static void 1806 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1807 { 1808 struct bridge_iflist *bif; 1809 struct ifnet *src_if, *dst_if; 1810 struct ether_header *eh; 1811 struct psref psref; 1812 struct psref psref_src; 1813 DECLARE_LOCK_VARIABLE; 1814 bool src_if_protected; 1815 1816 src_if = m_get_rcvif_psref(m, &psref_src); 1817 if (src_if == NULL) { 1818 /* Interface is being destroyed? */ 1819 goto discard; 1820 } 1821 1822 if_statadd2(&sc->sc_if, if_ipackets, 1, if_ibytes, m->m_pkthdr.len); 1823 1824 /* 1825 * Look up the bridge_iflist. 1826 */ 1827 bif = bridge_lookup_member_if(sc, src_if, &psref); 1828 if (bif == NULL) { 1829 /* Interface is not a bridge member (anymore?) */ 1830 goto discard; 1831 } 1832 1833 if (bif->bif_flags & IFBIF_STP) { 1834 switch (bif->bif_state) { 1835 case BSTP_IFSTATE_BLOCKING: 1836 case BSTP_IFSTATE_LISTENING: 1837 case BSTP_IFSTATE_DISABLED: 1838 bridge_release_member(sc, bif, &psref); 1839 goto discard; 1840 } 1841 } 1842 1843 eh = mtod(m, struct ether_header *); 1844 1845 /* 1846 * If the interface is learning, and the source 1847 * address is valid and not multicast, record 1848 * the address. 1849 */ 1850 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1851 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1852 (eh->ether_shost[0] == 0 && 1853 eh->ether_shost[1] == 0 && 1854 eh->ether_shost[2] == 0 && 1855 eh->ether_shost[3] == 0 && 1856 eh->ether_shost[4] == 0 && 1857 eh->ether_shost[5] == 0) == 0) { 1858 (void) bridge_rtupdate(sc, eh->ether_shost, 1859 src_if, 0, IFBAF_DYNAMIC); 1860 } 1861 1862 if ((bif->bif_flags & IFBIF_STP) != 0 && 1863 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1864 bridge_release_member(sc, bif, &psref); 1865 goto discard; 1866 } 1867 1868 src_if_protected = ((bif->bif_flags & IFBIF_PROTECTED) != 0); 1869 1870 bridge_release_member(sc, bif, &psref); 1871 1872 /* 1873 * At this point, the port either doesn't participate 1874 * in spanning tree or it is in the forwarding state. 1875 */ 1876 1877 /* 1878 * If the packet is unicast, destined for someone on 1879 * "this" side of the bridge, drop it. 1880 */ 1881 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1882 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1883 if (src_if == dst_if) 1884 goto discard; 1885 } else { 1886 /* ...forward it to all interfaces. */ 1887 if_statinc(&sc->sc_if, if_imcasts); 1888 dst_if = NULL; 1889 } 1890 1891 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, src_if, PFIL_IN) != 0 || 1892 m == NULL) { 1893 goto discard; 1894 } 1895 1896 if (dst_if == NULL) { 1897 bridge_broadcast(sc, src_if, src_if_protected, m); 1898 goto out; 1899 } 1900 1901 m_put_rcvif_psref(src_if, &psref_src); 1902 src_if = NULL; 1903 1904 /* 1905 * At this point, we're dealing with a unicast frame 1906 * going to a different interface. 1907 */ 1908 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1909 goto discard; 1910 1911 bif = bridge_lookup_member_if(sc, dst_if, &psref); 1912 if (bif == NULL) { 1913 /* Not a member of the bridge (anymore?) */ 1914 goto discard; 1915 } 1916 1917 if (bif->bif_flags & IFBIF_STP) { 1918 switch (bif->bif_state) { 1919 case BSTP_IFSTATE_DISABLED: 1920 case BSTP_IFSTATE_BLOCKING: 1921 bridge_release_member(sc, bif, &psref); 1922 goto discard; 1923 } 1924 } 1925 1926 if ((bif->bif_flags & IFBIF_PROTECTED) && src_if_protected) { 1927 bridge_release_member(sc, bif, &psref); 1928 goto discard; 1929 } 1930 1931 bridge_release_member(sc, bif, &psref); 1932 1933 /* 1934 * Before enqueueing this packet to the destination interface, 1935 * clear any in-bound checksum flags to prevent them from being 1936 * misused as out-bound flags. 1937 */ 1938 m->m_pkthdr.csum_flags = 0; 1939 1940 ACQUIRE_GLOBAL_LOCKS(); 1941 bridge_enqueue(sc, dst_if, m, 1); 1942 RELEASE_GLOBAL_LOCKS(); 1943 out: 1944 if (src_if != NULL) 1945 m_put_rcvif_psref(src_if, &psref_src); 1946 return; 1947 1948 discard: 1949 m_freem(m); 1950 goto out; 1951 } 1952 1953 static bool 1954 bstp_state_before_learning(struct bridge_iflist *bif) 1955 { 1956 if (bif->bif_flags & IFBIF_STP) { 1957 switch (bif->bif_state) { 1958 case BSTP_IFSTATE_BLOCKING: 1959 case BSTP_IFSTATE_LISTENING: 1960 case BSTP_IFSTATE_DISABLED: 1961 return true; 1962 } 1963 } 1964 return false; 1965 } 1966 1967 static bool 1968 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1969 { 1970 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1971 1972 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1973 #if NCARP > 0 1974 || (bif->bif_ifp->if_carp && 1975 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1976 #endif /* NCARP > 0 */ 1977 ) 1978 return true; 1979 1980 return false; 1981 } 1982 1983 /* 1984 * bridge_input: 1985 * 1986 * Receive input from a member interface. Queue the packet for 1987 * bridging if it is not for us. 1988 */ 1989 static void 1990 bridge_input(struct ifnet *ifp, struct mbuf *m) 1991 { 1992 struct bridge_softc *sc = ifp->if_bridge; 1993 struct bridge_iflist *bif; 1994 struct ether_header *eh; 1995 struct psref psref; 1996 int bound; 1997 DECLARE_LOCK_VARIABLE; 1998 1999 KASSERT(!cpu_intr_p()); 2000 2001 if (__predict_false(sc == NULL) || 2002 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 2003 ACQUIRE_GLOBAL_LOCKS(); 2004 ether_input(ifp, m); 2005 RELEASE_GLOBAL_LOCKS(); 2006 return; 2007 } 2008 2009 bound = curlwp_bind(); 2010 bif = bridge_lookup_member_if(sc, ifp, &psref); 2011 if (bif == NULL) { 2012 curlwp_bindx(bound); 2013 ACQUIRE_GLOBAL_LOCKS(); 2014 ether_input(ifp, m); 2015 RELEASE_GLOBAL_LOCKS(); 2016 return; 2017 } 2018 2019 eh = mtod(m, struct ether_header *); 2020 2021 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 2022 if (memcmp(etherbroadcastaddr, 2023 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 2024 m->m_flags |= M_BCAST; 2025 else 2026 m->m_flags |= M_MCAST; 2027 } 2028 2029 /* 2030 * A 'fast' path for packets addressed to interfaces that are 2031 * part of this bridge. 2032 */ 2033 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 2034 !bstp_state_before_learning(bif)) { 2035 struct bridge_iflist *_bif; 2036 struct ifnet *_ifp = NULL; 2037 int s; 2038 struct psref _psref; 2039 2040 s = pserialize_read_enter(); 2041 BRIDGE_IFLIST_READER_FOREACH(_bif, sc) { 2042 /* It is destined for us. */ 2043 if (bridge_ourether(_bif, eh, 0)) { 2044 bridge_acquire_member(sc, _bif, &_psref); 2045 pserialize_read_exit(s); 2046 if (_bif->bif_flags & IFBIF_LEARNING) 2047 (void) bridge_rtupdate(sc, 2048 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 2049 m_set_rcvif(m, _bif->bif_ifp); 2050 _ifp = _bif->bif_ifp; 2051 bridge_release_member(sc, _bif, &_psref); 2052 goto out; 2053 } 2054 2055 /* We just received a packet that we sent out. */ 2056 if (bridge_ourether(_bif, eh, 1)) 2057 break; 2058 } 2059 pserialize_read_exit(s); 2060 out: 2061 2062 if (_bif != NULL) { 2063 bridge_release_member(sc, bif, &psref); 2064 curlwp_bindx(bound); 2065 if (_ifp != NULL) { 2066 m->m_flags &= ~M_PROMISC; 2067 ACQUIRE_GLOBAL_LOCKS(); 2068 ether_input(_ifp, m); 2069 RELEASE_GLOBAL_LOCKS(); 2070 } else 2071 m_freem(m); 2072 return; 2073 } 2074 } 2075 2076 /* Tap off 802.1D packets; they do not get forwarded. */ 2077 if (bif->bif_flags & IFBIF_STP && 2078 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 2079 bstp_input(sc, bif, m); 2080 bridge_release_member(sc, bif, &psref); 2081 curlwp_bindx(bound); 2082 return; 2083 } 2084 2085 /* 2086 * A normal switch would discard the packet here, but that's not what 2087 * we've done historically. This also prevents some obnoxious behaviour. 2088 */ 2089 if (bstp_state_before_learning(bif)) { 2090 bridge_release_member(sc, bif, &psref); 2091 curlwp_bindx(bound); 2092 ACQUIRE_GLOBAL_LOCKS(); 2093 ether_input(ifp, m); 2094 RELEASE_GLOBAL_LOCKS(); 2095 return; 2096 } 2097 2098 bridge_release_member(sc, bif, &psref); 2099 2100 bridge_forward(sc, m); 2101 2102 curlwp_bindx(bound); 2103 } 2104 2105 /* 2106 * bridge_broadcast: 2107 * 2108 * Send a frame to all interfaces that are members of 2109 * the bridge, except for the one on which the packet 2110 * arrived. 2111 */ 2112 static void 2113 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2114 bool src_if_protected, struct mbuf *m) 2115 { 2116 struct bridge_iflist *bif; 2117 struct mbuf *mc; 2118 struct ifnet *dst_if; 2119 bool bmcast; 2120 int s; 2121 DECLARE_LOCK_VARIABLE; 2122 2123 bmcast = m->m_flags & (M_BCAST|M_MCAST); 2124 2125 s = pserialize_read_enter(); 2126 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 2127 struct psref psref; 2128 2129 bridge_acquire_member(sc, bif, &psref); 2130 pserialize_read_exit(s); 2131 2132 dst_if = bif->bif_ifp; 2133 2134 if (bif->bif_flags & IFBIF_STP) { 2135 switch (bif->bif_state) { 2136 case BSTP_IFSTATE_BLOCKING: 2137 case BSTP_IFSTATE_DISABLED: 2138 goto next; 2139 } 2140 } 2141 2142 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 2143 goto next; 2144 2145 if ((dst_if->if_flags & IFF_RUNNING) == 0) 2146 goto next; 2147 2148 if (dst_if != src_if) { 2149 if ((bif->bif_flags & IFBIF_PROTECTED) && 2150 src_if_protected) { 2151 goto next; 2152 } 2153 2154 mc = m_copypacket(m, M_DONTWAIT); 2155 if (mc == NULL) { 2156 if_statinc(&sc->sc_if, if_oerrors); 2157 goto next; 2158 } 2159 /* 2160 * Before enqueueing this packet to the destination 2161 * interface, clear any in-bound checksum flags to 2162 * prevent them from being misused as out-bound flags. 2163 */ 2164 mc->m_pkthdr.csum_flags = 0; 2165 2166 ACQUIRE_GLOBAL_LOCKS(); 2167 bridge_enqueue(sc, dst_if, mc, 1); 2168 RELEASE_GLOBAL_LOCKS(); 2169 } 2170 2171 if (bmcast) { 2172 mc = m_copypacket(m, M_DONTWAIT); 2173 if (mc == NULL) { 2174 if_statinc(&sc->sc_if, if_oerrors); 2175 goto next; 2176 } 2177 /* 2178 * Before enqueueing this packet to the destination 2179 * interface, clear any in-bound checksum flags to 2180 * prevent them from being misused as out-bound flags. 2181 */ 2182 mc->m_pkthdr.csum_flags = 0; 2183 2184 m_set_rcvif(mc, dst_if); 2185 mc->m_flags &= ~M_PROMISC; 2186 2187 ACQUIRE_GLOBAL_LOCKS(); 2188 ether_input(dst_if, mc); 2189 RELEASE_GLOBAL_LOCKS(); 2190 } 2191 next: 2192 s = pserialize_read_enter(); 2193 bridge_release_member(sc, bif, &psref); 2194 } 2195 pserialize_read_exit(s); 2196 2197 m_freem(m); 2198 } 2199 2200 static int 2201 bridge_rtalloc(struct bridge_softc *sc, const uint8_t *dst, 2202 struct bridge_rtnode **brtp) 2203 { 2204 struct bridge_rtnode *brt; 2205 int error; 2206 2207 if (sc->sc_brtcnt >= sc->sc_brtmax) 2208 return ENOSPC; 2209 2210 /* 2211 * Allocate a new bridge forwarding node, and 2212 * initialize the expiration time and Ethernet 2213 * address. 2214 */ 2215 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 2216 if (brt == NULL) 2217 return ENOMEM; 2218 2219 memset(brt, 0, sizeof(*brt)); 2220 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2221 brt->brt_flags = IFBAF_DYNAMIC; 2222 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2223 PSLIST_ENTRY_INIT(brt, brt_list); 2224 PSLIST_ENTRY_INIT(brt, brt_hash); 2225 2226 BRIDGE_RT_LOCK(sc); 2227 error = bridge_rtnode_insert(sc, brt); 2228 BRIDGE_RT_UNLOCK(sc); 2229 2230 if (error != 0) { 2231 pool_put(&bridge_rtnode_pool, brt); 2232 return error; 2233 } 2234 2235 *brtp = brt; 2236 return 0; 2237 } 2238 2239 /* 2240 * bridge_rtupdate: 2241 * 2242 * Add a bridge routing entry. 2243 */ 2244 static int 2245 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 2246 struct ifnet *dst_if, int setflags, uint8_t flags) 2247 { 2248 struct bridge_rtnode *brt; 2249 int s; 2250 2251 again: 2252 /* 2253 * A route for this destination might already exist. If so, 2254 * update it, otherwise create a new one. 2255 */ 2256 s = pserialize_read_enter(); 2257 brt = bridge_rtnode_lookup(sc, dst); 2258 2259 if (brt != NULL) { 2260 brt->brt_ifp = dst_if; 2261 if (setflags) { 2262 brt->brt_flags = flags; 2263 if (flags & IFBAF_STATIC) 2264 brt->brt_expire = 0; 2265 else 2266 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2267 } else { 2268 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2269 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2270 } 2271 } 2272 pserialize_read_exit(s); 2273 2274 if (brt == NULL) { 2275 int r; 2276 2277 r = bridge_rtalloc(sc, dst, &brt); 2278 if (r != 0) 2279 return r; 2280 goto again; 2281 } 2282 2283 return 0; 2284 } 2285 2286 /* 2287 * bridge_rtlookup: 2288 * 2289 * Lookup the destination interface for an address. 2290 */ 2291 static struct ifnet * 2292 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2293 { 2294 struct bridge_rtnode *brt; 2295 struct ifnet *ifs = NULL; 2296 int s; 2297 2298 s = pserialize_read_enter(); 2299 brt = bridge_rtnode_lookup(sc, addr); 2300 if (brt != NULL) 2301 ifs = brt->brt_ifp; 2302 pserialize_read_exit(s); 2303 2304 return ifs; 2305 } 2306 2307 typedef bool (*bridge_iterate_cb_t) 2308 (struct bridge_softc *, struct bridge_rtnode *, bool *, void *); 2309 2310 /* 2311 * bridge_rtlist_iterate_remove: 2312 * 2313 * It iterates on sc->sc_rtlist and removes rtnodes of it which func 2314 * callback judges to remove. Removals of rtnodes are done in a manner 2315 * of pserialize. To this end, all kmem_* operations are placed out of 2316 * mutexes. 2317 */ 2318 static void 2319 bridge_rtlist_iterate_remove(struct bridge_softc *sc, bridge_iterate_cb_t func, void *arg) 2320 { 2321 struct bridge_rtnode *brt; 2322 struct bridge_rtnode **brt_list; 2323 int i, count; 2324 2325 retry: 2326 count = sc->sc_brtcnt; 2327 if (count == 0) 2328 return; 2329 brt_list = kmem_alloc(sizeof(*brt_list) * count, KM_SLEEP); 2330 2331 BRIDGE_RT_LOCK(sc); 2332 if (__predict_false(sc->sc_brtcnt > count)) { 2333 /* The rtnodes increased, we need more memory */ 2334 BRIDGE_RT_UNLOCK(sc); 2335 kmem_free(brt_list, sizeof(*brt_list) * count); 2336 goto retry; 2337 } 2338 2339 i = 0; 2340 /* 2341 * We don't need to use a _SAFE variant here because we know 2342 * that a removed item keeps its next pointer as-is thanks to 2343 * pslist(9) and isn't freed in the loop. 2344 */ 2345 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 2346 bool need_break = false; 2347 if (func(sc, brt, &need_break, arg)) { 2348 bridge_rtnode_remove(sc, brt); 2349 brt_list[i++] = brt; 2350 } 2351 if (need_break) 2352 break; 2353 } 2354 2355 if (i > 0) 2356 BRIDGE_RT_PSZ_PERFORM(sc); 2357 BRIDGE_RT_UNLOCK(sc); 2358 2359 while (--i >= 0) 2360 bridge_rtnode_destroy(brt_list[i]); 2361 2362 kmem_free(brt_list, sizeof(*brt_list) * count); 2363 } 2364 2365 static bool 2366 bridge_rttrim0_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2367 bool *need_break, void *arg) 2368 { 2369 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2370 /* Take into account of the subsequent removal */ 2371 if ((sc->sc_brtcnt - 1) <= sc->sc_brtmax) 2372 *need_break = true; 2373 return true; 2374 } else 2375 return false; 2376 } 2377 2378 static void 2379 bridge_rttrim0(struct bridge_softc *sc) 2380 { 2381 bridge_rtlist_iterate_remove(sc, bridge_rttrim0_cb, NULL); 2382 } 2383 2384 /* 2385 * bridge_rttrim: 2386 * 2387 * Trim the routine table so that we have a number 2388 * of routing entries less than or equal to the 2389 * maximum number. 2390 */ 2391 static void 2392 bridge_rttrim(struct bridge_softc *sc) 2393 { 2394 2395 /* Make sure we actually need to do this. */ 2396 if (sc->sc_brtcnt <= sc->sc_brtmax) 2397 return; 2398 2399 /* Force an aging cycle; this might trim enough addresses. */ 2400 bridge_rtage(sc); 2401 if (sc->sc_brtcnt <= sc->sc_brtmax) 2402 return; 2403 2404 bridge_rttrim0(sc); 2405 2406 return; 2407 } 2408 2409 /* 2410 * bridge_timer: 2411 * 2412 * Aging timer for the bridge. 2413 */ 2414 static void 2415 bridge_timer(void *arg) 2416 { 2417 struct bridge_softc *sc = arg; 2418 2419 workqueue_enqueue(sc->sc_rtage_wq, &sc->sc_rtage_wk, NULL); 2420 } 2421 2422 static void 2423 bridge_rtage_work(struct work *wk, void *arg) 2424 { 2425 struct bridge_softc *sc = arg; 2426 2427 KASSERT(wk == &sc->sc_rtage_wk); 2428 2429 bridge_rtage(sc); 2430 2431 if (sc->sc_if.if_flags & IFF_RUNNING) 2432 callout_reset(&sc->sc_brcallout, 2433 bridge_rtable_prune_period * hz, bridge_timer, sc); 2434 } 2435 2436 static bool 2437 bridge_rtage_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2438 bool *need_break, void *arg) 2439 { 2440 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2441 time_uptime >= brt->brt_expire) 2442 return true; 2443 else 2444 return false; 2445 } 2446 2447 /* 2448 * bridge_rtage: 2449 * 2450 * Perform an aging cycle. 2451 */ 2452 static void 2453 bridge_rtage(struct bridge_softc *sc) 2454 { 2455 bridge_rtlist_iterate_remove(sc, bridge_rtage_cb, NULL); 2456 } 2457 2458 2459 static bool 2460 bridge_rtflush_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2461 bool *need_break, void *arg) 2462 { 2463 int full = *(int*)arg; 2464 2465 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2466 return true; 2467 else 2468 return false; 2469 } 2470 2471 /* 2472 * bridge_rtflush: 2473 * 2474 * Remove all dynamic addresses from the bridge. 2475 */ 2476 static void 2477 bridge_rtflush(struct bridge_softc *sc, int full) 2478 { 2479 bridge_rtlist_iterate_remove(sc, bridge_rtflush_cb, &full); 2480 } 2481 2482 /* 2483 * bridge_rtdaddr: 2484 * 2485 * Remove an address from the table. 2486 */ 2487 static int 2488 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2489 { 2490 struct bridge_rtnode *brt; 2491 2492 BRIDGE_RT_LOCK(sc); 2493 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2494 BRIDGE_RT_UNLOCK(sc); 2495 return ENOENT; 2496 } 2497 bridge_rtnode_remove(sc, brt); 2498 BRIDGE_RT_PSZ_PERFORM(sc); 2499 BRIDGE_RT_UNLOCK(sc); 2500 2501 bridge_rtnode_destroy(brt); 2502 2503 return 0; 2504 } 2505 2506 /* 2507 * bridge_rtdelete: 2508 * 2509 * Delete routes to a speicifc member interface. 2510 */ 2511 static void 2512 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2513 { 2514 struct bridge_rtnode *brt; 2515 2516 /* XXX pserialize_perform for each entry is slow */ 2517 again: 2518 BRIDGE_RT_LOCK(sc); 2519 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 2520 if (brt->brt_ifp == ifp) 2521 break; 2522 } 2523 if (brt == NULL) { 2524 BRIDGE_RT_UNLOCK(sc); 2525 return; 2526 } 2527 bridge_rtnode_remove(sc, brt); 2528 BRIDGE_RT_PSZ_PERFORM(sc); 2529 BRIDGE_RT_UNLOCK(sc); 2530 2531 bridge_rtnode_destroy(brt); 2532 2533 goto again; 2534 } 2535 2536 /* 2537 * bridge_rtable_init: 2538 * 2539 * Initialize the route table for this bridge. 2540 */ 2541 static void 2542 bridge_rtable_init(struct bridge_softc *sc) 2543 { 2544 int i; 2545 2546 sc->sc_rthash = kmem_alloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2547 KM_SLEEP); 2548 2549 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2550 PSLIST_INIT(&sc->sc_rthash[i]); 2551 2552 sc->sc_rthash_key = cprng_fast32(); 2553 2554 PSLIST_INIT(&sc->sc_rtlist); 2555 2556 sc->sc_rtlist_psz = pserialize_create(); 2557 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 2558 } 2559 2560 /* 2561 * bridge_rtable_fini: 2562 * 2563 * Deconstruct the route table for this bridge. 2564 */ 2565 static void 2566 bridge_rtable_fini(struct bridge_softc *sc) 2567 { 2568 2569 kmem_free(sc->sc_rthash, sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE); 2570 mutex_obj_free(sc->sc_rtlist_lock); 2571 pserialize_destroy(sc->sc_rtlist_psz); 2572 } 2573 2574 /* 2575 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2576 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2577 */ 2578 #define mix(a, b, c) \ 2579 do { \ 2580 a -= b; a -= c; a ^= (c >> 13); \ 2581 b -= c; b -= a; b ^= (a << 8); \ 2582 c -= a; c -= b; c ^= (b >> 13); \ 2583 a -= b; a -= c; a ^= (c >> 12); \ 2584 b -= c; b -= a; b ^= (a << 16); \ 2585 c -= a; c -= b; c ^= (b >> 5); \ 2586 a -= b; a -= c; a ^= (c >> 3); \ 2587 b -= c; b -= a; b ^= (a << 10); \ 2588 c -= a; c -= b; c ^= (b >> 15); \ 2589 } while (/*CONSTCOND*/0) 2590 2591 static inline uint32_t 2592 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2593 { 2594 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2595 2596 b += addr[5] << 8; 2597 b += addr[4]; 2598 a += (uint32_t)addr[3] << 24; 2599 a += addr[2] << 16; 2600 a += addr[1] << 8; 2601 a += addr[0]; 2602 2603 mix(a, b, c); 2604 2605 return (c & BRIDGE_RTHASH_MASK); 2606 } 2607 2608 #undef mix 2609 2610 /* 2611 * bridge_rtnode_lookup: 2612 * 2613 * Look up a bridge route node for the specified destination. 2614 */ 2615 static struct bridge_rtnode * 2616 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2617 { 2618 struct bridge_rtnode *brt; 2619 uint32_t hash; 2620 int dir; 2621 2622 hash = bridge_rthash(sc, addr); 2623 BRIDGE_RTHASH_READER_FOREACH(brt, sc, hash) { 2624 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2625 if (dir == 0) 2626 return brt; 2627 if (dir > 0) 2628 return NULL; 2629 } 2630 2631 return NULL; 2632 } 2633 2634 /* 2635 * bridge_rtnode_insert: 2636 * 2637 * Insert the specified bridge node into the route table. We 2638 * assume the entry is not already in the table. 2639 */ 2640 static int 2641 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2642 { 2643 struct bridge_rtnode *lbrt, *prev = NULL; 2644 uint32_t hash; 2645 2646 KASSERT(BRIDGE_RT_LOCKED(sc)); 2647 2648 hash = bridge_rthash(sc, brt->brt_addr); 2649 BRIDGE_RTHASH_WRITER_FOREACH(lbrt, sc, hash) { 2650 int dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2651 if (dir == 0) 2652 return EEXIST; 2653 if (dir > 0) 2654 break; 2655 prev = lbrt; 2656 } 2657 if (prev == NULL) 2658 BRIDGE_RTHASH_WRITER_INSERT_HEAD(sc, hash, brt); 2659 else 2660 BRIDGE_RTHASH_WRITER_INSERT_AFTER(prev, brt); 2661 2662 BRIDGE_RTLIST_WRITER_INSERT_HEAD(sc, brt); 2663 sc->sc_brtcnt++; 2664 2665 return 0; 2666 } 2667 2668 /* 2669 * bridge_rtnode_remove: 2670 * 2671 * Remove a bridge rtnode from the rthash and the rtlist of a bridge. 2672 */ 2673 static void 2674 bridge_rtnode_remove(struct bridge_softc *sc, struct bridge_rtnode *brt) 2675 { 2676 2677 KASSERT(BRIDGE_RT_LOCKED(sc)); 2678 2679 BRIDGE_RTHASH_WRITER_REMOVE(brt); 2680 BRIDGE_RTLIST_WRITER_REMOVE(brt); 2681 sc->sc_brtcnt--; 2682 } 2683 2684 /* 2685 * bridge_rtnode_destroy: 2686 * 2687 * Destroy a bridge rtnode. 2688 */ 2689 static void 2690 bridge_rtnode_destroy(struct bridge_rtnode *brt) 2691 { 2692 2693 PSLIST_ENTRY_DESTROY(brt, brt_list); 2694 PSLIST_ENTRY_DESTROY(brt, brt_hash); 2695 pool_put(&bridge_rtnode_pool, brt); 2696 } 2697 2698 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2699 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2700 2701 /* 2702 * Send bridge packets through IPF if they are one of the types IPF can deal 2703 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2704 * question.) 2705 */ 2706 static int 2707 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2708 { 2709 int snap, error; 2710 struct ether_header *eh1, eh2; 2711 struct llc llc1; 2712 uint16_t ether_type; 2713 2714 snap = 0; 2715 error = -1; /* Default error if not error == 0 */ 2716 eh1 = mtod(*mp, struct ether_header *); 2717 ether_type = ntohs(eh1->ether_type); 2718 2719 /* 2720 * Check for SNAP/LLC. 2721 */ 2722 if (ether_type < ETHERMTU) { 2723 struct llc *llc2 = (struct llc *)(eh1 + 1); 2724 2725 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2726 llc2->llc_dsap == LLC_SNAP_LSAP && 2727 llc2->llc_ssap == LLC_SNAP_LSAP && 2728 llc2->llc_control == LLC_UI) { 2729 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2730 snap = 1; 2731 } 2732 } 2733 2734 /* drop VLAN traffic untagged by hardware offloading */ 2735 if (vlan_has_tag(*mp)) 2736 goto bad; 2737 2738 /* 2739 * If we're trying to filter bridge traffic, don't look at anything 2740 * other than IP and ARP traffic. If the filter doesn't understand 2741 * IPv6, don't allow IPv6 through the bridge either. This is lame 2742 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2743 * but of course we don't have an AppleTalk filter to begin with. 2744 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2745 * ARP traffic.) 2746 */ 2747 switch (ether_type) { 2748 case ETHERTYPE_ARP: 2749 case ETHERTYPE_REVARP: 2750 return 0; /* Automatically pass */ 2751 case ETHERTYPE_IP: 2752 # ifdef INET6 2753 case ETHERTYPE_IPV6: 2754 # endif /* INET6 */ 2755 break; 2756 default: 2757 goto bad; 2758 } 2759 2760 /* Strip off the Ethernet header and keep a copy. */ 2761 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2762 m_adj(*mp, ETHER_HDR_LEN); 2763 2764 /* Strip off snap header, if present */ 2765 if (snap) { 2766 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2767 m_adj(*mp, sizeof(struct llc)); 2768 } 2769 2770 /* 2771 * Check basic packet sanity and run IPF through pfil. 2772 */ 2773 KASSERT(!cpu_intr_p()); 2774 switch (ether_type) 2775 { 2776 case ETHERTYPE_IP : 2777 error = bridge_ip_checkbasic(mp); 2778 if (error == 0) 2779 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2780 break; 2781 # ifdef INET6 2782 case ETHERTYPE_IPV6 : 2783 error = bridge_ip6_checkbasic(mp); 2784 if (error == 0) 2785 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2786 break; 2787 # endif 2788 default : 2789 error = 0; 2790 break; 2791 } 2792 2793 if (*mp == NULL) 2794 return error; 2795 if (error != 0) 2796 goto bad; 2797 2798 error = -1; 2799 2800 /* 2801 * Finally, put everything back the way it was and return 2802 */ 2803 if (snap) { 2804 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2805 if (*mp == NULL) 2806 return error; 2807 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2808 } 2809 2810 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2811 if (*mp == NULL) 2812 return error; 2813 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2814 2815 return 0; 2816 2817 bad: 2818 m_freem(*mp); 2819 *mp = NULL; 2820 return error; 2821 } 2822 2823 /* 2824 * Perform basic checks on header size since 2825 * IPF assumes ip_input has already processed 2826 * it for it. Cut-and-pasted from ip_input.c. 2827 * Given how simple the IPv6 version is, 2828 * does the IPv4 version really need to be 2829 * this complicated? 2830 * 2831 * XXX Should we update ipstat here, or not? 2832 * XXX Right now we update ipstat but not 2833 * XXX csum_counter. 2834 */ 2835 static int 2836 bridge_ip_checkbasic(struct mbuf **mp) 2837 { 2838 struct mbuf *m = *mp; 2839 struct ip *ip; 2840 int len, hlen; 2841 2842 if (*mp == NULL) 2843 return -1; 2844 2845 if (M_GET_ALIGNED_HDR(&m, struct ip, true) != 0) { 2846 /* XXXJRT new stat, please */ 2847 ip_statinc(IP_STAT_TOOSMALL); 2848 goto bad; 2849 } 2850 ip = mtod(m, struct ip *); 2851 if (ip == NULL) goto bad; 2852 2853 if (ip->ip_v != IPVERSION) { 2854 ip_statinc(IP_STAT_BADVERS); 2855 goto bad; 2856 } 2857 hlen = ip->ip_hl << 2; 2858 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2859 ip_statinc(IP_STAT_BADHLEN); 2860 goto bad; 2861 } 2862 if (hlen > m->m_len) { 2863 if ((m = m_pullup(m, hlen)) == 0) { 2864 ip_statinc(IP_STAT_BADHLEN); 2865 goto bad; 2866 } 2867 ip = mtod(m, struct ip *); 2868 if (ip == NULL) goto bad; 2869 } 2870 2871 switch (m->m_pkthdr.csum_flags & 2872 ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_IPv4) | 2873 M_CSUM_IPv4_BAD)) { 2874 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2875 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2876 goto bad; 2877 2878 case M_CSUM_IPv4: 2879 /* Checksum was okay. */ 2880 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2881 break; 2882 2883 default: 2884 /* Must compute it ourselves. */ 2885 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2886 if (in_cksum(m, hlen) != 0) 2887 goto bad; 2888 break; 2889 } 2890 2891 /* Retrieve the packet length. */ 2892 len = ntohs(ip->ip_len); 2893 2894 /* 2895 * Check for additional length bogosity 2896 */ 2897 if (len < hlen) { 2898 ip_statinc(IP_STAT_BADLEN); 2899 goto bad; 2900 } 2901 2902 /* 2903 * Check that the amount of data in the buffers 2904 * is as at least much as the IP header would have us expect. 2905 * Drop packet if shorter than we expect. 2906 */ 2907 if (m->m_pkthdr.len < len) { 2908 ip_statinc(IP_STAT_TOOSHORT); 2909 goto bad; 2910 } 2911 2912 /* Checks out, proceed */ 2913 *mp = m; 2914 return 0; 2915 2916 bad: 2917 *mp = m; 2918 return -1; 2919 } 2920 2921 # ifdef INET6 2922 /* 2923 * Same as above, but for IPv6. 2924 * Cut-and-pasted from ip6_input.c. 2925 * XXX Should we update ip6stat, or not? 2926 */ 2927 static int 2928 bridge_ip6_checkbasic(struct mbuf **mp) 2929 { 2930 struct mbuf *m = *mp; 2931 struct ip6_hdr *ip6; 2932 2933 /* 2934 * If the IPv6 header is not aligned, slurp it up into a new 2935 * mbuf with space for link headers, in the event we forward 2936 * it. Otherwise, if it is aligned, make sure the entire base 2937 * IPv6 header is in the first mbuf of the chain. 2938 */ 2939 if (M_GET_ALIGNED_HDR(&m, struct ip6_hdr, true) != 0) { 2940 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2941 /* XXXJRT new stat, please */ 2942 ip6_statinc(IP6_STAT_TOOSMALL); 2943 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2944 goto bad; 2945 } 2946 2947 ip6 = mtod(m, struct ip6_hdr *); 2948 2949 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2950 ip6_statinc(IP6_STAT_BADVERS); 2951 in6_ifstat_inc(m_get_rcvif_NOMPSAFE(m), ifs6_in_hdrerr); 2952 goto bad; 2953 } 2954 2955 /* Checks out, proceed */ 2956 *mp = m; 2957 return 0; 2958 2959 bad: 2960 *mp = m; 2961 return -1; 2962 } 2963 # endif /* INET6 */ 2964
Indexes created Thu Oct 02 14:10:14 GMT 2025