if_bridge.c revision 1.183
1 /* $NetBSD: if_bridge.c,v 1.183 2021/09/30 03:57:48 yamaguchi 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 1.183 2021/09/30 03:57:48 yamaguchi 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> 105 106 #include <net/bpf.h> 107 #include <net/if.h> 108 #include <net/if_dl.h> 109 #include <net/if_types.h> 110 #include <net/if_llc.h> 111 112 #include <net/if_ether.h> 113 #include <net/if_bridgevar.h> 114 #include <net/ether_sw_offload.h> 115 116 /* Used for bridge_ip[6]_checkbasic */ 117 #include <netinet/in.h> 118 #include <netinet/in_systm.h> 119 #include <netinet/ip.h> 120 #include <netinet/ip_var.h> 121 #include <netinet/ip_private.h> /* XXX */ 122 #include <netinet/ip6.h> 123 #include <netinet6/in6_var.h> 124 #include <netinet6/ip6_var.h> 125 #include <netinet6/ip6_private.h> /* XXX */ 126 127 /* 128 * Size of the route hash table. Must be a power of two. 129 */ 130 #ifndef BRIDGE_RTHASH_SIZE 131 #define BRIDGE_RTHASH_SIZE 1024 132 #endif 133 134 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 135 136 #include "carp.h" 137 #if NCARP > 0 138 #include <netinet/in.h> 139 #include <netinet/in_var.h> 140 #include <netinet/ip_carp.h> 141 #endif 142 143 #include "ioconf.h" 144 145 __CTASSERT(sizeof(struct ifbifconf) == sizeof(struct ifbaconf)); 146 __CTASSERT(offsetof(struct ifbifconf, ifbic_len) == offsetof(struct ifbaconf, ifbac_len)); 147 __CTASSERT(offsetof(struct ifbifconf, ifbic_buf) == offsetof(struct ifbaconf, ifbac_buf)); 148 149 /* 150 * Maximum number of addresses to cache. 151 */ 152 #ifndef BRIDGE_RTABLE_MAX 153 #define BRIDGE_RTABLE_MAX 100 154 #endif 155 156 /* 157 * Spanning tree defaults. 158 */ 159 #define BSTP_DEFAULT_MAX_AGE (20 * 256) 160 #define BSTP_DEFAULT_HELLO_TIME (2 * 256) 161 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) 162 #define BSTP_DEFAULT_HOLD_TIME (1 * 256) 163 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 164 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 165 #define BSTP_DEFAULT_PATH_COST 55 166 167 /* 168 * Timeout (in seconds) for entries learned dynamically. 169 */ 170 #ifndef BRIDGE_RTABLE_TIMEOUT 171 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 172 #endif 173 174 /* 175 * Number of seconds between walks of the route list. 176 */ 177 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 178 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 179 #endif 180 181 #define BRIDGE_RT_LOCK(_sc) mutex_enter((_sc)->sc_rtlist_lock) 182 #define BRIDGE_RT_UNLOCK(_sc) mutex_exit((_sc)->sc_rtlist_lock) 183 #define BRIDGE_RT_LOCKED(_sc) mutex_owned((_sc)->sc_rtlist_lock) 184 185 #define BRIDGE_RT_PSZ_PERFORM(_sc) \ 186 pserialize_perform((_sc)->sc_rtlist_psz) 187 188 #define BRIDGE_RT_RENTER(__s) do { __s = pserialize_read_enter(); } while (0) 189 #define BRIDGE_RT_REXIT(__s) do { pserialize_read_exit(__s); } while (0) 190 191 #define BRIDGE_RTLIST_READER_FOREACH(_brt, _sc) \ 192 PSLIST_READER_FOREACH((_brt), &((_sc)->sc_rtlist), \ 193 struct bridge_rtnode, brt_list) 194 #define BRIDGE_RTLIST_WRITER_FOREACH(_brt, _sc) \ 195 PSLIST_WRITER_FOREACH((_brt), &((_sc)->sc_rtlist), \ 196 struct bridge_rtnode, brt_list) 197 #define BRIDGE_RTLIST_WRITER_INSERT_HEAD(_sc, _brt) \ 198 PSLIST_WRITER_INSERT_HEAD(&(_sc)->sc_rtlist, brt, brt_list) 199 #define BRIDGE_RTLIST_WRITER_REMOVE(_brt) \ 200 PSLIST_WRITER_REMOVE((_brt), brt_list) 201 202 #define BRIDGE_RTHASH_READER_FOREACH(_brt, _sc, _hash) \ 203 PSLIST_READER_FOREACH((_brt), &(_sc)->sc_rthash[(_hash)], \ 204 struct bridge_rtnode, brt_hash) 205 #define BRIDGE_RTHASH_WRITER_FOREACH(_brt, _sc, _hash) \ 206 PSLIST_WRITER_FOREACH((_brt), &(_sc)->sc_rthash[(_hash)], \ 207 struct bridge_rtnode, brt_hash) 208 #define BRIDGE_RTHASH_WRITER_INSERT_HEAD(_sc, _hash, _brt) \ 209 PSLIST_WRITER_INSERT_HEAD(&(_sc)->sc_rthash[(_hash)], brt, brt_hash) 210 #define BRIDGE_RTHASH_WRITER_INSERT_AFTER(_brt, _new) \ 211 PSLIST_WRITER_INSERT_AFTER((_brt), (_new), brt_hash) 212 #define BRIDGE_RTHASH_WRITER_REMOVE(_brt) \ 213 PSLIST_WRITER_REMOVE((_brt), brt_hash) 214 215 #ifdef NET_MPSAFE 216 #define DECLARE_LOCK_VARIABLE 217 #define ACQUIRE_GLOBAL_LOCKS() do { } while (0) 218 #define RELEASE_GLOBAL_LOCKS() do { } while (0) 219 #else 220 #define DECLARE_LOCK_VARIABLE int __s 221 #define ACQUIRE_GLOBAL_LOCKS() do { \ 222 KERNEL_LOCK(1, NULL); \ 223 mutex_enter(softnet_lock); \ 224 __s = splsoftnet(); \ 225 } while (0) 226 #define RELEASE_GLOBAL_LOCKS() do { \ 227 splx(__s); \ 228 mutex_exit(softnet_lock); \ 229 KERNEL_UNLOCK_ONE(NULL); \ 230 } while (0) 231 #endif 232 233 struct psref_class *bridge_psref_class __read_mostly; 234 235 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 236 237 static struct pool bridge_rtnode_pool; 238 239 static int bridge_clone_create(struct if_clone *, int); 240 static int bridge_clone_destroy(struct ifnet *); 241 242 static int bridge_ioctl(struct ifnet *, u_long, void *); 243 static int bridge_init(struct ifnet *); 244 static void bridge_stop(struct ifnet *, int); 245 static void bridge_start(struct ifnet *); 246 static void bridge_ifdetach(void *); 247 248 static void bridge_input(struct ifnet *, struct mbuf *); 249 static void bridge_forward(struct bridge_softc *, struct mbuf *); 250 251 static void bridge_timer(void *); 252 253 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 254 struct mbuf *); 255 256 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 257 struct ifnet *, int, uint8_t); 258 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 259 static void bridge_rttrim(struct bridge_softc *); 260 static void bridge_rtage(struct bridge_softc *); 261 static void bridge_rtage_work(struct work *, void *); 262 static void bridge_rtflush(struct bridge_softc *, int); 263 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 264 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp); 265 266 static void bridge_rtable_init(struct bridge_softc *); 267 static void bridge_rtable_fini(struct bridge_softc *); 268 269 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 270 const uint8_t *); 271 static int bridge_rtnode_insert(struct bridge_softc *, 272 struct bridge_rtnode *); 273 static void bridge_rtnode_remove(struct bridge_softc *, 274 struct bridge_rtnode *); 275 static void bridge_rtnode_destroy(struct bridge_rtnode *); 276 277 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 278 const char *name, 279 struct psref *); 280 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 281 struct ifnet *ifp, 282 struct psref *); 283 static void bridge_release_member(struct bridge_softc *, struct bridge_iflist *, 284 struct psref *); 285 static void bridge_delete_member(struct bridge_softc *, 286 struct bridge_iflist *); 287 static void bridge_acquire_member(struct bridge_softc *sc, 288 struct bridge_iflist *, 289 struct psref *); 290 291 static int bridge_ioctl_add(struct bridge_softc *, void *); 292 static int bridge_ioctl_del(struct bridge_softc *, void *); 293 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 294 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 295 static int bridge_ioctl_scache(struct bridge_softc *, void *); 296 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 297 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 298 static int bridge_ioctl_rts(struct bridge_softc *, void *); 299 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 300 static int bridge_ioctl_sto(struct bridge_softc *, void *); 301 static int bridge_ioctl_gto(struct bridge_softc *, void *); 302 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 303 static int bridge_ioctl_flush(struct bridge_softc *, void *); 304 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 305 static int bridge_ioctl_spri(struct bridge_softc *, void *); 306 static int bridge_ioctl_ght(struct bridge_softc *, void *); 307 static int bridge_ioctl_sht(struct bridge_softc *, void *); 308 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 309 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 310 static int bridge_ioctl_gma(struct bridge_softc *, void *); 311 static int bridge_ioctl_sma(struct bridge_softc *, void *); 312 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 313 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 314 static int bridge_ioctl_gfilt(struct bridge_softc *, void *); 315 static int bridge_ioctl_sfilt(struct bridge_softc *, void *); 316 static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int); 317 static int bridge_ip_checkbasic(struct mbuf **mp); 318 # ifdef INET6 319 static int bridge_ip6_checkbasic(struct mbuf **mp); 320 # endif /* INET6 */ 321 322 struct bridge_control { 323 int (*bc_func)(struct bridge_softc *, void *); 324 int bc_argsize; 325 int bc_flags; 326 }; 327 328 #define BC_F_COPYIN 0x01 /* copy arguments in */ 329 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 330 #define BC_F_SUSER 0x04 /* do super-user check */ 331 #define BC_F_XLATEIN 0x08 /* xlate arguments in */ 332 #define BC_F_XLATEOUT 0x10 /* xlate arguments out */ 333 334 static const struct bridge_control bridge_control_table[] = { 335 [BRDGADD] = {bridge_ioctl_add, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 336 [BRDGDEL] = {bridge_ioctl_del, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 337 338 [BRDGGIFFLGS] = {bridge_ioctl_gifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_COPYOUT}, 339 [BRDGSIFFLGS] = {bridge_ioctl_sifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 340 341 [BRDGSCACHE] = {bridge_ioctl_scache, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 342 [BRDGGCACHE] = {bridge_ioctl_gcache, sizeof(struct ifbrparam), BC_F_COPYOUT}, 343 344 [OBRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_COPYIN|BC_F_COPYOUT}, 345 [OBRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_COPYIN|BC_F_COPYOUT}, 346 347 [BRDGSADDR] = {bridge_ioctl_saddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 348 349 [BRDGSTO] = {bridge_ioctl_sto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 350 [BRDGGTO] = {bridge_ioctl_gto, sizeof(struct ifbrparam), BC_F_COPYOUT}, 351 352 [BRDGDADDR] = {bridge_ioctl_daddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 353 354 [BRDGFLUSH] = {bridge_ioctl_flush, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 355 356 [BRDGGPRI] = {bridge_ioctl_gpri, sizeof(struct ifbrparam), BC_F_COPYOUT}, 357 [BRDGSPRI] = {bridge_ioctl_spri, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 358 359 [BRDGGHT] = {bridge_ioctl_ght, sizeof(struct ifbrparam), BC_F_COPYOUT}, 360 [BRDGSHT] = {bridge_ioctl_sht, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 361 362 [BRDGGFD] = {bridge_ioctl_gfd, sizeof(struct ifbrparam), BC_F_COPYOUT}, 363 [BRDGSFD] = {bridge_ioctl_sfd, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 364 365 [BRDGGMA] = {bridge_ioctl_gma, sizeof(struct ifbrparam), BC_F_COPYOUT}, 366 [BRDGSMA] = {bridge_ioctl_sma, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 367 368 [BRDGSIFPRIO] = {bridge_ioctl_sifprio, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 369 370 [BRDGSIFCOST] = {bridge_ioctl_sifcost, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 371 372 [BRDGGFILT] = {bridge_ioctl_gfilt, sizeof(struct ifbrparam), BC_F_COPYOUT}, 373 [BRDGSFILT] = {bridge_ioctl_sfilt, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 374 375 [BRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 376 [BRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 377 }; 378 379 static const int bridge_control_table_size = __arraycount(bridge_control_table); 380 381 static struct if_clone bridge_cloner = 382 IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy); 383 384 /* 385 * bridgeattach: 386 * 387 * Pseudo-device attach routine. 388 */ 389 void 390 bridgeattach(int n) 391 { 392 393 pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode), 394 0, 0, 0, "brtpl", NULL, IPL_NET); 395 396 bridge_psref_class = psref_class_create("bridge", IPL_SOFTNET); 397 398 if_clone_attach(&bridge_cloner); 399 } 400 401 /* 402 * bridge_clone_create: 403 * 404 * Create a new bridge instance. 405 */ 406 static int 407 bridge_clone_create(struct if_clone *ifc, int unit) 408 { 409 struct bridge_softc *sc; 410 struct ifnet *ifp; 411 int error; 412 413 sc = kmem_zalloc(sizeof(*sc), KM_SLEEP); 414 ifp = &sc->sc_if; 415 416 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 417 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 418 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 419 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 420 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 421 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 422 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 423 sc->sc_filter_flags = 0; 424 425 /* Initialize our routing table. */ 426 bridge_rtable_init(sc); 427 428 error = workqueue_create(&sc->sc_rtage_wq, "bridge_rtage", 429 bridge_rtage_work, sc, PRI_SOFTNET, IPL_SOFTNET, WQ_MPSAFE); 430 if (error) 431 panic("%s: workqueue_create %d\n", __func__, error); 432 433 callout_init(&sc->sc_brcallout, CALLOUT_MPSAFE); 434 callout_init(&sc->sc_bstpcallout, CALLOUT_MPSAFE); 435 436 mutex_init(&sc->sc_iflist_psref.bip_lock, MUTEX_DEFAULT, IPL_NONE); 437 PSLIST_INIT(&sc->sc_iflist_psref.bip_iflist); 438 sc->sc_iflist_psref.bip_psz = pserialize_create(); 439 440 if_initname(ifp, ifc->ifc_name, unit); 441 ifp->if_softc = sc; 442 #ifdef NET_MPSAFE 443 ifp->if_extflags = IFEF_MPSAFE; 444 #endif 445 ifp->if_mtu = ETHERMTU; 446 ifp->if_ioctl = bridge_ioctl; 447 ifp->if_output = bridge_output; 448 ifp->if_start = bridge_start; 449 ifp->if_stop = bridge_stop; 450 ifp->if_init = bridge_init; 451 ifp->if_type = IFT_BRIDGE; 452 ifp->if_addrlen = 0; 453 ifp->if_dlt = DLT_EN10MB; 454 ifp->if_hdrlen = ETHER_HDR_LEN; 455 if_initialize(ifp); 456 457 /* 458 * Set the link state to down. 459 * When interfaces are added the link state will reflect 460 * the best link state of the combined interfaces. 461 */ 462 ifp->if_link_state = LINK_STATE_DOWN; 463 464 if_alloc_sadl(ifp); 465 if_register(ifp); 466 467 return 0; 468 } 469 470 /* 471 * bridge_clone_destroy: 472 * 473 * Destroy a bridge instance. 474 */ 475 static int 476 bridge_clone_destroy(struct ifnet *ifp) 477 { 478 struct bridge_softc *sc = ifp->if_softc; 479 struct bridge_iflist *bif; 480 481 if ((ifp->if_flags & IFF_RUNNING) != 0) 482 bridge_stop(ifp, 1); 483 484 BRIDGE_LOCK(sc); 485 for (;;) { 486 bif = PSLIST_WRITER_FIRST(&sc->sc_iflist_psref.bip_iflist, struct bridge_iflist, 487 bif_next); 488 if (bif == NULL) 489 break; 490 bridge_delete_member(sc, bif); 491 } 492 PSLIST_DESTROY(&sc->sc_iflist_psref.bip_iflist); 493 BRIDGE_UNLOCK(sc); 494 495 if_detach(ifp); 496 497 /* Tear down the routing table. */ 498 bridge_rtable_fini(sc); 499 500 pserialize_destroy(sc->sc_iflist_psref.bip_psz); 501 mutex_destroy(&sc->sc_iflist_psref.bip_lock); 502 callout_destroy(&sc->sc_brcallout); 503 callout_destroy(&sc->sc_bstpcallout); 504 workqueue_destroy(sc->sc_rtage_wq); 505 kmem_free(sc, sizeof(*sc)); 506 507 return 0; 508 } 509 510 /* 511 * bridge_ioctl: 512 * 513 * Handle a control request from the operator. 514 */ 515 static int 516 bridge_ioctl(struct ifnet *ifp, u_long cmd, void *data) 517 { 518 struct bridge_softc *sc = ifp->if_softc; 519 struct lwp *l = curlwp; /* XXX */ 520 union { 521 struct ifbreq ifbreq; 522 struct ifbifconf ifbifconf; 523 struct ifbareq ifbareq; 524 struct ifbaconf ifbaconf; 525 struct ifbrparam ifbrparam; 526 } args; 527 struct ifdrv *ifd = (struct ifdrv *) data; 528 const struct bridge_control *bc = NULL; /* XXXGCC */ 529 int s, error = 0; 530 531 /* Authorize command before calling splsoftnet(). */ 532 switch (cmd) { 533 case SIOCGDRVSPEC: 534 case SIOCSDRVSPEC: 535 if (ifd->ifd_cmd >= bridge_control_table_size 536 || (bc = &bridge_control_table[ifd->ifd_cmd]) == NULL) { 537 error = EINVAL; 538 return error; 539 } 540 541 /* We only care about BC_F_SUSER at this point. */ 542 if ((bc->bc_flags & BC_F_SUSER) == 0) 543 break; 544 545 error = kauth_authorize_network(l->l_cred, 546 KAUTH_NETWORK_INTERFACE_BRIDGE, 547 cmd == SIOCGDRVSPEC ? 548 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_GETPRIV : 549 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_SETPRIV, 550 ifd, NULL, NULL); 551 if (error) 552 return error; 553 554 break; 555 } 556 557 s = splsoftnet(); 558 559 switch (cmd) { 560 case SIOCGDRVSPEC: 561 case SIOCSDRVSPEC: 562 KASSERT(bc != NULL); 563 if (cmd == SIOCGDRVSPEC && 564 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) == 0) { 565 error = EINVAL; 566 break; 567 } 568 else if (cmd == SIOCSDRVSPEC && 569 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) != 0) { 570 error = EINVAL; 571 break; 572 } 573 574 /* BC_F_SUSER is checked above, before splsoftnet(). */ 575 576 if ((bc->bc_flags & (BC_F_XLATEIN|BC_F_XLATEOUT)) == 0 577 && (ifd->ifd_len != bc->bc_argsize 578 || ifd->ifd_len > sizeof(args))) { 579 error = EINVAL; 580 break; 581 } 582 583 memset(&args, 0, sizeof(args)); 584 if (bc->bc_flags & BC_F_COPYIN) { 585 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 586 if (error) 587 break; 588 } else if (bc->bc_flags & BC_F_XLATEIN) { 589 args.ifbifconf.ifbic_len = ifd->ifd_len; 590 args.ifbifconf.ifbic_buf = ifd->ifd_data; 591 } 592 593 error = (*bc->bc_func)(sc, &args); 594 if (error) 595 break; 596 597 if (bc->bc_flags & BC_F_COPYOUT) { 598 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 599 } else if (bc->bc_flags & BC_F_XLATEOUT) { 600 ifd->ifd_len = args.ifbifconf.ifbic_len; 601 ifd->ifd_data = args.ifbifconf.ifbic_buf; 602 } 603 break; 604 605 case SIOCSIFFLAGS: 606 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 607 break; 608 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 609 case IFF_RUNNING: 610 /* 611 * If interface is marked down and it is running, 612 * then stop and disable it. 613 */ 614 (*ifp->if_stop)(ifp, 1); 615 break; 616 case IFF_UP: 617 /* 618 * If interface is marked up and it is stopped, then 619 * start it. 620 */ 621 error = (*ifp->if_init)(ifp); 622 break; 623 default: 624 break; 625 } 626 break; 627 628 case SIOCSIFMTU: 629 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 630 error = 0; 631 break; 632 633 case SIOCGIFCAP: 634 { 635 struct ifcapreq *ifcr = (struct ifcapreq *)data; 636 ifcr->ifcr_capabilities = sc->sc_capenable; 637 ifcr->ifcr_capenable = sc->sc_capenable; 638 break; 639 } 640 641 default: 642 error = ifioctl_common(ifp, cmd, data); 643 break; 644 } 645 646 splx(s); 647 648 return error; 649 } 650 651 /* 652 * bridge_lookup_member: 653 * 654 * Lookup a bridge member interface. 655 */ 656 static struct bridge_iflist * 657 bridge_lookup_member(struct bridge_softc *sc, const char *name, struct psref *psref) 658 { 659 struct bridge_iflist *bif; 660 struct ifnet *ifp; 661 int s; 662 663 BRIDGE_PSZ_RENTER(s); 664 665 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 666 ifp = bif->bif_ifp; 667 if (strcmp(ifp->if_xname, name) == 0) 668 break; 669 } 670 if (bif != NULL) 671 bridge_acquire_member(sc, bif, psref); 672 673 BRIDGE_PSZ_REXIT(s); 674 675 return bif; 676 } 677 678 /* 679 * bridge_lookup_member_if: 680 * 681 * Lookup a bridge member interface by ifnet*. 682 */ 683 static struct bridge_iflist * 684 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp, 685 struct psref *psref) 686 { 687 struct bridge_iflist *bif; 688 int s; 689 690 BRIDGE_PSZ_RENTER(s); 691 692 bif = member_ifp->if_bridgeif; 693 if (bif != NULL) { 694 psref_acquire(psref, &bif->bif_psref, 695 bridge_psref_class); 696 } 697 698 BRIDGE_PSZ_REXIT(s); 699 700 return bif; 701 } 702 703 static void 704 bridge_acquire_member(struct bridge_softc *sc, struct bridge_iflist *bif, 705 struct psref *psref) 706 { 707 708 psref_acquire(psref, &bif->bif_psref, bridge_psref_class); 709 } 710 711 /* 712 * bridge_release_member: 713 * 714 * Release the specified member interface. 715 */ 716 static void 717 bridge_release_member(struct bridge_softc *sc, struct bridge_iflist *bif, 718 struct psref *psref) 719 { 720 721 psref_release(psref, &bif->bif_psref, bridge_psref_class); 722 } 723 724 /* 725 * bridge_delete_member: 726 * 727 * Delete the specified member interface. 728 */ 729 static void 730 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 731 { 732 struct ifnet *ifs = bif->bif_ifp; 733 734 KASSERT(BRIDGE_LOCKED(sc)); 735 736 ifs->_if_input = ether_input; 737 ifs->if_bridge = NULL; 738 ifs->if_bridgeif = NULL; 739 740 PSLIST_WRITER_REMOVE(bif, bif_next); 741 BRIDGE_PSZ_PERFORM(sc); 742 743 if_linkstate_change_disestablish(ifs, 744 bif->bif_linkstate_hook, BRIDGE_LOCK_OBJ(sc)); 745 ether_ifdetachhook_disestablish(ifs, 746 bif->bif_ifdetach_hook, BRIDGE_LOCK_OBJ(sc)); 747 748 BRIDGE_UNLOCK(sc); 749 750 switch (ifs->if_type) { 751 case IFT_ETHER: 752 case IFT_L2TP: 753 /* 754 * Take the interface out of promiscuous mode. 755 * Don't call it with holding a spin lock. 756 */ 757 (void) ifpromisc(ifs, 0); 758 IFNET_LOCK(ifs); 759 (void) ether_disable_vlan_mtu(ifs); 760 IFNET_UNLOCK(ifs); 761 break; 762 default: 763 #ifdef DIAGNOSTIC 764 panic("%s: impossible", __func__); 765 #endif 766 break; 767 } 768 769 psref_target_destroy(&bif->bif_psref, bridge_psref_class); 770 771 PSLIST_ENTRY_DESTROY(bif, bif_next); 772 kmem_free(bif, sizeof(*bif)); 773 774 BRIDGE_LOCK(sc); 775 } 776 777 /* 778 * bridge_calc_csum_flags: 779 * 780 * Calculate logical and b/w csum flags each member interface supports. 781 */ 782 void 783 bridge_calc_csum_flags(struct bridge_softc *sc) 784 { 785 struct bridge_iflist *bif; 786 struct ifnet *ifs = NULL; 787 int flags = ~0; 788 int capenable = ~0; 789 790 BRIDGE_LOCK(sc); 791 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 792 ifs = bif->bif_ifp; 793 flags &= ifs->if_csum_flags_tx; 794 capenable &= ifs->if_capenable; 795 } 796 sc->sc_csum_flags_tx = flags; 797 sc->sc_capenable = (ifs != NULL) ? capenable : 0; 798 BRIDGE_UNLOCK(sc); 799 } 800 801 /* 802 * bridge_calc_link_state: 803 * 804 * Calculate the link state based on each member interface. 805 */ 806 static void 807 bridge_calc_link_state(void *xsc) 808 { 809 struct bridge_softc *sc = xsc; 810 struct bridge_iflist *bif; 811 struct ifnet *ifs; 812 int link_state = LINK_STATE_DOWN; 813 814 BRIDGE_LOCK(sc); 815 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 816 ifs = bif->bif_ifp; 817 if (ifs->if_link_state == LINK_STATE_UP) { 818 link_state = LINK_STATE_UP; 819 break; 820 } 821 if (ifs->if_link_state == LINK_STATE_UNKNOWN) 822 link_state = LINK_STATE_UNKNOWN; 823 } 824 if_link_state_change(&sc->sc_if, link_state); 825 BRIDGE_UNLOCK(sc); 826 } 827 828 static int 829 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 830 { 831 struct ifbreq *req = arg; 832 struct bridge_iflist *bif = NULL; 833 struct ifnet *ifs; 834 int error = 0; 835 struct psref psref; 836 837 ifs = if_get(req->ifbr_ifsname, &psref); 838 if (ifs == NULL) 839 return ENOENT; 840 841 if (ifs->if_bridge == sc) { 842 error = EEXIST; 843 goto out; 844 } 845 846 if (ifs->if_bridge != NULL) { 847 error = EBUSY; 848 goto out; 849 } 850 851 if (ifs->_if_input != ether_input) { 852 error = EINVAL; 853 goto out; 854 } 855 856 /* FIXME: doesn't work with non-IFF_SIMPLEX interfaces */ 857 if ((ifs->if_flags & IFF_SIMPLEX) == 0) { 858 error = EINVAL; 859 goto out; 860 } 861 862 bif = kmem_alloc(sizeof(*bif), KM_SLEEP); 863 864 switch (ifs->if_type) { 865 case IFT_ETHER: 866 if (sc->sc_if.if_mtu != ifs->if_mtu) { 867 /* Change MTU of added interface to bridge MTU */ 868 struct ifreq ifr; 869 memset(&ifr, 0, sizeof(ifr)); 870 ifr.ifr_mtu = sc->sc_if.if_mtu; 871 IFNET_LOCK(ifs); 872 error = ifs->if_ioctl(ifs, SIOCSIFMTU, &ifr); 873 IFNET_UNLOCK(ifs); 874 if (error != 0) 875 goto out; 876 } 877 /* FALLTHROUGH */ 878 case IFT_L2TP: 879 IFNET_LOCK(ifs); 880 error = ether_enable_vlan_mtu(ifs); 881 IFNET_UNLOCK(ifs); 882 if (error > 0) 883 goto out; 884 /* 885 * Place the interface into promiscuous mode. 886 */ 887 error = ifpromisc(ifs, 1); 888 if (error) 889 goto out; 890 break; 891 default: 892 error = EINVAL; 893 goto out; 894 } 895 896 bif->bif_ifp = ifs; 897 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 898 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 899 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 900 bif->bif_linkstate_hook = if_linkstate_change_establish(ifs, 901 bridge_calc_link_state, sc); 902 PSLIST_ENTRY_INIT(bif, bif_next); 903 psref_target_init(&bif->bif_psref, bridge_psref_class); 904 905 BRIDGE_LOCK(sc); 906 907 ifs->if_bridge = sc; 908 ifs->if_bridgeif = bif; 909 PSLIST_WRITER_INSERT_HEAD(&sc->sc_iflist_psref.bip_iflist, bif, bif_next); 910 ifs->_if_input = bridge_input; 911 912 BRIDGE_UNLOCK(sc); 913 914 bif->bif_ifdetach_hook = ether_ifdetachhook_establish(ifs, 915 bridge_ifdetach, (void *)ifs); 916 917 bridge_calc_csum_flags(sc); 918 bridge_calc_link_state(sc); 919 920 if (sc->sc_if.if_flags & IFF_RUNNING) 921 bstp_initialization(sc); 922 else 923 bstp_stop(sc); 924 925 out: 926 if_put(ifs, &psref); 927 if (error) { 928 if (bif != NULL) 929 kmem_free(bif, sizeof(*bif)); 930 } 931 return error; 932 } 933 934 static int 935 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 936 { 937 struct ifbreq *req = arg; 938 const char *name = req->ifbr_ifsname; 939 struct bridge_iflist *bif; 940 struct ifnet *ifs; 941 942 BRIDGE_LOCK(sc); 943 944 /* 945 * Don't use bridge_lookup_member. We want to get a member 946 * with bif_refs == 0. 947 */ 948 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 949 ifs = bif->bif_ifp; 950 if (strcmp(ifs->if_xname, name) == 0) 951 break; 952 } 953 954 if (bif == NULL) { 955 BRIDGE_UNLOCK(sc); 956 return ENOENT; 957 } 958 959 bridge_delete_member(sc, bif); 960 961 BRIDGE_UNLOCK(sc); 962 963 bridge_rtdelete(sc, ifs); 964 bridge_calc_csum_flags(sc); 965 bridge_calc_link_state(sc); 966 967 if (sc->sc_if.if_flags & IFF_RUNNING) 968 bstp_initialization(sc); 969 970 return 0; 971 } 972 973 static int 974 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 975 { 976 struct ifbreq *req = arg; 977 struct bridge_iflist *bif; 978 struct psref psref; 979 980 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 981 if (bif == NULL) 982 return ENOENT; 983 984 req->ifbr_ifsflags = bif->bif_flags; 985 req->ifbr_state = bif->bif_state; 986 req->ifbr_priority = bif->bif_priority; 987 req->ifbr_path_cost = bif->bif_path_cost; 988 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 989 990 bridge_release_member(sc, bif, &psref); 991 992 return 0; 993 } 994 995 static int 996 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 997 { 998 struct ifbreq *req = arg; 999 struct bridge_iflist *bif; 1000 struct psref psref; 1001 1002 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1003 if (bif == NULL) 1004 return ENOENT; 1005 1006 if (req->ifbr_ifsflags & IFBIF_STP) { 1007 switch (bif->bif_ifp->if_type) { 1008 case IFT_ETHER: 1009 case IFT_L2TP: 1010 /* These can do spanning tree. */ 1011 break; 1012 1013 default: 1014 /* Nothing else can. */ 1015 bridge_release_member(sc, bif, &psref); 1016 return EINVAL; 1017 } 1018 } 1019 1020 bif->bif_flags = req->ifbr_ifsflags; 1021 1022 bridge_release_member(sc, bif, &psref); 1023 1024 if (sc->sc_if.if_flags & IFF_RUNNING) 1025 bstp_initialization(sc); 1026 1027 return 0; 1028 } 1029 1030 static int 1031 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1032 { 1033 struct ifbrparam *param = arg; 1034 1035 sc->sc_brtmax = param->ifbrp_csize; 1036 bridge_rttrim(sc); 1037 1038 return 0; 1039 } 1040 1041 static int 1042 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1043 { 1044 struct ifbrparam *param = arg; 1045 1046 param->ifbrp_csize = sc->sc_brtmax; 1047 1048 return 0; 1049 } 1050 1051 static int 1052 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1053 { 1054 struct ifbifconf *bifc = arg; 1055 struct bridge_iflist *bif; 1056 struct ifbreq *breqs; 1057 int i, count, error = 0; 1058 1059 retry: 1060 BRIDGE_LOCK(sc); 1061 count = 0; 1062 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 1063 count++; 1064 BRIDGE_UNLOCK(sc); 1065 1066 if (count == 0) { 1067 bifc->ifbic_len = 0; 1068 return 0; 1069 } 1070 1071 if (bifc->ifbic_len == 0 || bifc->ifbic_len < (sizeof(*breqs) * count)) { 1072 /* Tell that a larger buffer is needed */ 1073 bifc->ifbic_len = sizeof(*breqs) * count; 1074 return 0; 1075 } 1076 1077 breqs = kmem_alloc(sizeof(*breqs) * count, KM_SLEEP); 1078 1079 BRIDGE_LOCK(sc); 1080 1081 i = 0; 1082 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 1083 i++; 1084 if (i > count) { 1085 /* 1086 * The number of members has been increased. 1087 * We need more memory! 1088 */ 1089 BRIDGE_UNLOCK(sc); 1090 kmem_free(breqs, sizeof(*breqs) * count); 1091 goto retry; 1092 } 1093 1094 i = 0; 1095 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 1096 struct ifbreq *breq = &breqs[i++]; 1097 memset(breq, 0, sizeof(*breq)); 1098 1099 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, 1100 sizeof(breq->ifbr_ifsname)); 1101 breq->ifbr_ifsflags = bif->bif_flags; 1102 breq->ifbr_state = bif->bif_state; 1103 breq->ifbr_priority = bif->bif_priority; 1104 breq->ifbr_path_cost = bif->bif_path_cost; 1105 breq->ifbr_portno = bif->bif_ifp->if_index & 0xff; 1106 } 1107 1108 /* Don't call copyout with holding the mutex */ 1109 BRIDGE_UNLOCK(sc); 1110 1111 for (i = 0; i < count; i++) { 1112 error = copyout(&breqs[i], bifc->ifbic_req + i, sizeof(*breqs)); 1113 if (error) 1114 break; 1115 } 1116 bifc->ifbic_len = sizeof(*breqs) * i; 1117 1118 kmem_free(breqs, sizeof(*breqs) * count); 1119 1120 return error; 1121 } 1122 1123 static int 1124 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1125 { 1126 struct ifbaconf *bac = arg; 1127 struct bridge_rtnode *brt; 1128 struct ifbareq bareq; 1129 int count = 0, error = 0, len; 1130 1131 if (bac->ifbac_len == 0) 1132 return 0; 1133 1134 BRIDGE_RT_LOCK(sc); 1135 1136 /* The passed buffer is not enough, tell a required size. */ 1137 if (bac->ifbac_len < (sizeof(bareq) * sc->sc_brtcnt)) { 1138 count = sc->sc_brtcnt; 1139 goto out; 1140 } 1141 1142 len = bac->ifbac_len; 1143 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 1144 if (len < sizeof(bareq)) 1145 goto out; 1146 memset(&bareq, 0, sizeof(bareq)); 1147 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1148 sizeof(bareq.ifba_ifsname)); 1149 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1150 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1151 bareq.ifba_expire = brt->brt_expire - time_uptime; 1152 } else 1153 bareq.ifba_expire = 0; 1154 bareq.ifba_flags = brt->brt_flags; 1155 1156 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1157 if (error) 1158 goto out; 1159 count++; 1160 len -= sizeof(bareq); 1161 } 1162 out: 1163 BRIDGE_RT_UNLOCK(sc); 1164 1165 bac->ifbac_len = sizeof(bareq) * count; 1166 return error; 1167 } 1168 1169 static int 1170 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1171 { 1172 struct ifbareq *req = arg; 1173 struct bridge_iflist *bif; 1174 int error; 1175 struct psref psref; 1176 1177 bif = bridge_lookup_member(sc, req->ifba_ifsname, &psref); 1178 if (bif == NULL) 1179 return ENOENT; 1180 1181 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1182 req->ifba_flags); 1183 1184 bridge_release_member(sc, bif, &psref); 1185 1186 return error; 1187 } 1188 1189 static int 1190 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1191 { 1192 struct ifbrparam *param = arg; 1193 1194 sc->sc_brttimeout = param->ifbrp_ctime; 1195 1196 return 0; 1197 } 1198 1199 static int 1200 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1201 { 1202 struct ifbrparam *param = arg; 1203 1204 param->ifbrp_ctime = sc->sc_brttimeout; 1205 1206 return 0; 1207 } 1208 1209 static int 1210 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1211 { 1212 struct ifbareq *req = arg; 1213 1214 return (bridge_rtdaddr(sc, req->ifba_dst)); 1215 } 1216 1217 static int 1218 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1219 { 1220 struct ifbreq *req = arg; 1221 1222 bridge_rtflush(sc, req->ifbr_ifsflags); 1223 1224 return 0; 1225 } 1226 1227 static int 1228 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1229 { 1230 struct ifbrparam *param = arg; 1231 1232 param->ifbrp_prio = sc->sc_bridge_priority; 1233 1234 return 0; 1235 } 1236 1237 static int 1238 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1239 { 1240 struct ifbrparam *param = arg; 1241 1242 sc->sc_bridge_priority = param->ifbrp_prio; 1243 1244 if (sc->sc_if.if_flags & IFF_RUNNING) 1245 bstp_initialization(sc); 1246 1247 return 0; 1248 } 1249 1250 static int 1251 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1252 { 1253 struct ifbrparam *param = arg; 1254 1255 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1256 1257 return 0; 1258 } 1259 1260 static int 1261 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1262 { 1263 struct ifbrparam *param = arg; 1264 1265 if (param->ifbrp_hellotime == 0) 1266 return EINVAL; 1267 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1268 1269 if (sc->sc_if.if_flags & IFF_RUNNING) 1270 bstp_initialization(sc); 1271 1272 return 0; 1273 } 1274 1275 static int 1276 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1277 { 1278 struct ifbrparam *param = arg; 1279 1280 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1281 1282 return 0; 1283 } 1284 1285 static int 1286 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1287 { 1288 struct ifbrparam *param = arg; 1289 1290 if (param->ifbrp_fwddelay == 0) 1291 return EINVAL; 1292 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1293 1294 if (sc->sc_if.if_flags & IFF_RUNNING) 1295 bstp_initialization(sc); 1296 1297 return 0; 1298 } 1299 1300 static int 1301 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1302 { 1303 struct ifbrparam *param = arg; 1304 1305 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1306 1307 return 0; 1308 } 1309 1310 static int 1311 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1312 { 1313 struct ifbrparam *param = arg; 1314 1315 if (param->ifbrp_maxage == 0) 1316 return EINVAL; 1317 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1318 1319 if (sc->sc_if.if_flags & IFF_RUNNING) 1320 bstp_initialization(sc); 1321 1322 return 0; 1323 } 1324 1325 static int 1326 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1327 { 1328 struct ifbreq *req = arg; 1329 struct bridge_iflist *bif; 1330 struct psref psref; 1331 1332 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1333 if (bif == NULL) 1334 return ENOENT; 1335 1336 bif->bif_priority = req->ifbr_priority; 1337 1338 if (sc->sc_if.if_flags & IFF_RUNNING) 1339 bstp_initialization(sc); 1340 1341 bridge_release_member(sc, bif, &psref); 1342 1343 return 0; 1344 } 1345 1346 static int 1347 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1348 { 1349 struct ifbrparam *param = arg; 1350 1351 param->ifbrp_filter = sc->sc_filter_flags; 1352 1353 return 0; 1354 } 1355 1356 static int 1357 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1358 { 1359 struct ifbrparam *param = arg; 1360 uint32_t nflags, oflags; 1361 1362 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1363 return EINVAL; 1364 1365 nflags = param->ifbrp_filter; 1366 oflags = sc->sc_filter_flags; 1367 1368 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1369 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1370 sc->sc_if.if_pfil); 1371 } 1372 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1373 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1374 sc->sc_if.if_pfil); 1375 } 1376 1377 sc->sc_filter_flags = nflags; 1378 1379 return 0; 1380 } 1381 1382 static int 1383 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1384 { 1385 struct ifbreq *req = arg; 1386 struct bridge_iflist *bif; 1387 struct psref psref; 1388 1389 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1390 if (bif == NULL) 1391 return ENOENT; 1392 1393 bif->bif_path_cost = req->ifbr_path_cost; 1394 1395 if (sc->sc_if.if_flags & IFF_RUNNING) 1396 bstp_initialization(sc); 1397 1398 bridge_release_member(sc, bif, &psref); 1399 1400 return 0; 1401 } 1402 1403 /* 1404 * bridge_ifdetach: 1405 * 1406 * Detach an interface from a bridge. Called when a member 1407 * interface is detaching. 1408 */ 1409 static void 1410 bridge_ifdetach(void *xifs) 1411 { 1412 struct ifnet *ifs; 1413 struct bridge_softc *sc; 1414 struct ifbreq breq; 1415 1416 ifs = (struct ifnet *)xifs; 1417 sc = ifs->if_bridge; 1418 1419 /* ioctl_lock should prevent this from happening */ 1420 KASSERT(sc != NULL); 1421 1422 memset(&breq, 0, sizeof(breq)); 1423 strlcpy(breq.ifbr_ifsname, ifs->if_xname, sizeof(breq.ifbr_ifsname)); 1424 1425 (void) bridge_ioctl_del(sc, &breq); 1426 } 1427 1428 /* 1429 * bridge_init: 1430 * 1431 * Initialize a bridge interface. 1432 */ 1433 static int 1434 bridge_init(struct ifnet *ifp) 1435 { 1436 struct bridge_softc *sc = ifp->if_softc; 1437 1438 KASSERT((ifp->if_flags & IFF_RUNNING) == 0); 1439 1440 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1441 bridge_timer, sc); 1442 bstp_initialization(sc); 1443 1444 ifp->if_flags |= IFF_RUNNING; 1445 return 0; 1446 } 1447 1448 /* 1449 * bridge_stop: 1450 * 1451 * Stop the bridge interface. 1452 */ 1453 static void 1454 bridge_stop(struct ifnet *ifp, int disable) 1455 { 1456 struct bridge_softc *sc = ifp->if_softc; 1457 1458 KASSERT((ifp->if_flags & IFF_RUNNING) != 0); 1459 ifp->if_flags &= ~IFF_RUNNING; 1460 1461 callout_halt(&sc->sc_brcallout, NULL); 1462 workqueue_wait(sc->sc_rtage_wq, &sc->sc_rtage_wk); 1463 bstp_stop(sc); 1464 bridge_rtflush(sc, IFBF_FLUSHDYN); 1465 } 1466 1467 /* 1468 * bridge_enqueue: 1469 * 1470 * Enqueue a packet on a bridge member interface. 1471 */ 1472 void 1473 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1474 int runfilt) 1475 { 1476 int len, error; 1477 short mflags; 1478 1479 if (runfilt) { 1480 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1481 dst_ifp, PFIL_OUT) != 0) { 1482 if (m != NULL) 1483 m_freem(m); 1484 return; 1485 } 1486 if (m == NULL) 1487 return; 1488 } 1489 1490 #ifdef ALTQ 1491 KERNEL_LOCK(1, NULL); 1492 /* 1493 * If ALTQ is enabled on the member interface, do 1494 * classification; the queueing discipline might 1495 * not require classification, but might require 1496 * the address family/header pointer in the pktattr. 1497 */ 1498 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1499 /* XXX IFT_ETHER */ 1500 altq_etherclassify(&dst_ifp->if_snd, m); 1501 } 1502 KERNEL_UNLOCK_ONE(NULL); 1503 #endif /* ALTQ */ 1504 1505 len = m->m_pkthdr.len; 1506 mflags = m->m_flags; 1507 1508 error = if_transmit_lock(dst_ifp, m); 1509 if (error) { 1510 /* mbuf is already freed */ 1511 if_statinc(&sc->sc_if, if_oerrors); 1512 return; 1513 } 1514 1515 net_stat_ref_t nsr = IF_STAT_GETREF(&sc->sc_if); 1516 if_statinc_ref(nsr, if_opackets); 1517 if_statadd_ref(nsr, if_obytes, len); 1518 if (mflags & M_MCAST) 1519 if_statinc_ref(nsr, if_omcasts); 1520 IF_STAT_PUTREF(&sc->sc_if); 1521 } 1522 1523 /* 1524 * bridge_output: 1525 * 1526 * Send output from a bridge member interface. This 1527 * performs the bridging function for locally originated 1528 * packets. 1529 * 1530 * The mbuf has the Ethernet header already attached. We must 1531 * enqueue or free the mbuf before returning. 1532 */ 1533 int 1534 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1535 const struct rtentry *rt) 1536 { 1537 struct ether_header *eh; 1538 struct ifnet *dst_if; 1539 struct bridge_softc *sc; 1540 struct mbuf *n; 1541 int s; 1542 1543 /* 1544 * bridge_output() is called from ether_output(), furthermore 1545 * ifp argument doesn't point to bridge(4). So, don't assert 1546 * IFEF_MPSAFE here. 1547 */ 1548 1549 KASSERT(m->m_len >= ETHER_HDR_LEN); 1550 1551 eh = mtod(m, struct ether_header *); 1552 sc = ifp->if_bridge; 1553 1554 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1555 if (memcmp(etherbroadcastaddr, 1556 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1557 m->m_flags |= M_BCAST; 1558 else 1559 m->m_flags |= M_MCAST; 1560 } 1561 1562 /* 1563 * If bridge is down, but the original output interface is up, 1564 * go ahead and send out that interface. Otherwise, the packet 1565 * is dropped below. 1566 */ 1567 if (__predict_false(sc == NULL) || 1568 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1569 dst_if = ifp; 1570 goto unicast_asis; 1571 } 1572 1573 /* 1574 * If the packet is a multicast, or we don't know a better way to 1575 * get there, send to all interfaces. 1576 */ 1577 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0) 1578 dst_if = NULL; 1579 else 1580 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1581 1582 /* 1583 * In general, we need to handle TX offload in software before 1584 * enqueueing a packet. However, we can send it as is in the 1585 * cases of unicast via (1) the source interface, or (2) an 1586 * interface which supports the specified offload options. 1587 * For multicast or broadcast, send it as is only if (3) all 1588 * the member interfaces support the specified options. 1589 */ 1590 1591 /* 1592 * Unicast via the source interface. 1593 */ 1594 if (dst_if == ifp) 1595 goto unicast_asis; 1596 1597 /* 1598 * Unicast via other interface. 1599 */ 1600 if (dst_if != NULL) { 1601 KASSERT(m->m_flags & M_PKTHDR); 1602 if (TX_OFFLOAD_SUPPORTED(dst_if->if_csum_flags_tx, 1603 m->m_pkthdr.csum_flags)) { 1604 /* 1605 * Unicast via an interface which supports the 1606 * specified offload options. 1607 */ 1608 goto unicast_asis; 1609 } 1610 1611 /* 1612 * Handle TX offload in software. For TSO, a packet is 1613 * split into multiple chunks. Thus, the return value of 1614 * ether_sw_offload_tx() is mbuf queue consists of them. 1615 */ 1616 m = ether_sw_offload_tx(ifp, m); 1617 if (m == NULL) 1618 return 0; 1619 1620 do { 1621 n = m->m_nextpkt; 1622 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1623 m_freem(m); 1624 else 1625 bridge_enqueue(sc, dst_if, m, 0); 1626 m = n; 1627 } while (m != NULL); 1628 1629 return 0; 1630 } 1631 1632 /* 1633 * Multicast or broadcast. 1634 */ 1635 if (TX_OFFLOAD_SUPPORTED(sc->sc_csum_flags_tx, 1636 m->m_pkthdr.csum_flags)) { 1637 /* 1638 * Specified TX offload options are supported by all 1639 * the member interfaces of this bridge. 1640 */ 1641 m->m_nextpkt = NULL; /* XXX */ 1642 } else { 1643 /* 1644 * Otherwise, handle TX offload in software. 1645 */ 1646 m = ether_sw_offload_tx(ifp, m); 1647 if (m == NULL) 1648 return 0; 1649 } 1650 1651 do { 1652 /* XXX Should call bridge_broadcast, but there are locking 1653 * issues which need resolving first. */ 1654 struct bridge_iflist *bif; 1655 struct mbuf *mc; 1656 bool used = false; 1657 1658 n = m->m_nextpkt; 1659 1660 BRIDGE_PSZ_RENTER(s); 1661 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1662 struct psref psref; 1663 1664 bridge_acquire_member(sc, bif, &psref); 1665 BRIDGE_PSZ_REXIT(s); 1666 1667 dst_if = bif->bif_ifp; 1668 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1669 goto next; 1670 1671 /* 1672 * If this is not the original output interface, 1673 * and the interface is participating in spanning 1674 * tree, make sure the port is in a state that 1675 * allows forwarding. 1676 */ 1677 if (dst_if != ifp && 1678 (bif->bif_flags & IFBIF_STP) != 0) { 1679 switch (bif->bif_state) { 1680 case BSTP_IFSTATE_BLOCKING: 1681 case BSTP_IFSTATE_LISTENING: 1682 case BSTP_IFSTATE_DISABLED: 1683 goto next; 1684 } 1685 } 1686 1687 if (PSLIST_READER_NEXT(bif, struct bridge_iflist, 1688 bif_next) == NULL && 1689 ((m->m_flags & (M_MCAST | M_BCAST)) == 0 || 1690 dst_if == ifp)) 1691 { 1692 used = true; 1693 mc = m; 1694 } else { 1695 mc = m_copypacket(m, M_DONTWAIT); 1696 if (mc == NULL) { 1697 if_statinc(&sc->sc_if, if_oerrors); 1698 goto next; 1699 } 1700 } 1701 1702 bridge_enqueue(sc, dst_if, mc, 0); 1703 1704 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0 && 1705 dst_if != ifp) 1706 { 1707 if (PSLIST_READER_NEXT(bif, 1708 struct bridge_iflist, bif_next) == NULL) 1709 { 1710 used = true; 1711 mc = m; 1712 } else { 1713 mc = m_copypacket(m, M_DONTWAIT); 1714 if (mc == NULL) { 1715 if_statinc(&sc->sc_if, 1716 if_oerrors); 1717 goto next; 1718 } 1719 } 1720 1721 m_set_rcvif(mc, dst_if); 1722 mc->m_flags &= ~M_PROMISC; 1723 1724 s = splsoftnet(); 1725 KERNEL_LOCK_UNLESS_IFP_MPSAFE(dst_if); 1726 ether_input(dst_if, mc); 1727 KERNEL_UNLOCK_UNLESS_IFP_MPSAFE(dst_if); 1728 splx(s); 1729 } 1730 1731 next: 1732 BRIDGE_PSZ_RENTER(s); 1733 bridge_release_member(sc, bif, &psref); 1734 1735 /* Guarantee we don't re-enter the loop as we already 1736 * decided we're at the end. */ 1737 if (used) 1738 break; 1739 } 1740 BRIDGE_PSZ_REXIT(s); 1741 1742 if (!used) 1743 m_freem(m); 1744 1745 m = n; 1746 } while (m != NULL); 1747 return 0; 1748 1749 unicast_asis: 1750 /* 1751 * XXX Spanning tree consideration here? 1752 */ 1753 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1754 m_freem(m); 1755 else 1756 bridge_enqueue(sc, dst_if, m, 0); 1757 return 0; 1758 } 1759 1760 /* 1761 * bridge_start: 1762 * 1763 * Start output on a bridge. 1764 * 1765 * NOTE: This routine should never be called in this implementation. 1766 */ 1767 static void 1768 bridge_start(struct ifnet *ifp) 1769 { 1770 1771 printf("%s: bridge_start() called\n", ifp->if_xname); 1772 } 1773 1774 /* 1775 * bridge_forward: 1776 * 1777 * The forwarding function of the bridge. 1778 */ 1779 static void 1780 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1781 { 1782 struct bridge_iflist *bif; 1783 struct ifnet *src_if, *dst_if; 1784 struct ether_header *eh; 1785 struct psref psref; 1786 struct psref psref_src; 1787 DECLARE_LOCK_VARIABLE; 1788 1789 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1790 return; 1791 1792 src_if = m_get_rcvif_psref(m, &psref_src); 1793 if (src_if == NULL) { 1794 /* Interface is being destroyed? */ 1795 m_freem(m); 1796 goto out; 1797 } 1798 1799 if_statadd2(&sc->sc_if, if_ipackets, 1, if_ibytes, m->m_pkthdr.len); 1800 1801 /* 1802 * Look up the bridge_iflist. 1803 */ 1804 bif = bridge_lookup_member_if(sc, src_if, &psref); 1805 if (bif == NULL) { 1806 /* Interface is not a bridge member (anymore?) */ 1807 m_freem(m); 1808 goto out; 1809 } 1810 1811 if (bif->bif_flags & IFBIF_STP) { 1812 switch (bif->bif_state) { 1813 case BSTP_IFSTATE_BLOCKING: 1814 case BSTP_IFSTATE_LISTENING: 1815 case BSTP_IFSTATE_DISABLED: 1816 m_freem(m); 1817 bridge_release_member(sc, bif, &psref); 1818 goto out; 1819 } 1820 } 1821 1822 eh = mtod(m, struct ether_header *); 1823 1824 /* 1825 * If the interface is learning, and the source 1826 * address is valid and not multicast, record 1827 * the address. 1828 */ 1829 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1830 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1831 (eh->ether_shost[0] == 0 && 1832 eh->ether_shost[1] == 0 && 1833 eh->ether_shost[2] == 0 && 1834 eh->ether_shost[3] == 0 && 1835 eh->ether_shost[4] == 0 && 1836 eh->ether_shost[5] == 0) == 0) { 1837 (void) bridge_rtupdate(sc, eh->ether_shost, 1838 src_if, 0, IFBAF_DYNAMIC); 1839 } 1840 1841 if ((bif->bif_flags & IFBIF_STP) != 0 && 1842 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1843 m_freem(m); 1844 bridge_release_member(sc, bif, &psref); 1845 goto out; 1846 } 1847 1848 bridge_release_member(sc, bif, &psref); 1849 1850 /* 1851 * At this point, the port either doesn't participate 1852 * in spanning tree or it is in the forwarding state. 1853 */ 1854 1855 /* 1856 * If the packet is unicast, destined for someone on 1857 * "this" side of the bridge, drop it. 1858 */ 1859 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1860 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1861 if (src_if == dst_if) { 1862 m_freem(m); 1863 goto out; 1864 } 1865 } else { 1866 /* ...forward it to all interfaces. */ 1867 if_statinc(&sc->sc_if, if_imcasts); 1868 dst_if = NULL; 1869 } 1870 1871 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, src_if, PFIL_IN) != 0) { 1872 if (m != NULL) 1873 m_freem(m); 1874 goto out; 1875 } 1876 if (m == NULL) 1877 goto out; 1878 1879 if (dst_if == NULL) { 1880 bridge_broadcast(sc, src_if, m); 1881 goto out; 1882 } 1883 1884 m_put_rcvif_psref(src_if, &psref_src); 1885 src_if = NULL; 1886 1887 /* 1888 * At this point, we're dealing with a unicast frame 1889 * going to a different interface. 1890 */ 1891 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1892 m_freem(m); 1893 goto out; 1894 } 1895 1896 bif = bridge_lookup_member_if(sc, dst_if, &psref); 1897 if (bif == NULL) { 1898 /* Not a member of the bridge (anymore?) */ 1899 m_freem(m); 1900 goto out; 1901 } 1902 1903 if (bif->bif_flags & IFBIF_STP) { 1904 switch (bif->bif_state) { 1905 case BSTP_IFSTATE_DISABLED: 1906 case BSTP_IFSTATE_BLOCKING: 1907 m_freem(m); 1908 bridge_release_member(sc, bif, &psref); 1909 goto out; 1910 } 1911 } 1912 1913 bridge_release_member(sc, bif, &psref); 1914 1915 /* 1916 * Before enqueueing this packet to the destination interface, 1917 * clear any in-bound checksum flags to prevent them from being 1918 * misused as out-bound flags. 1919 */ 1920 m->m_pkthdr.csum_flags = 0; 1921 1922 ACQUIRE_GLOBAL_LOCKS(); 1923 bridge_enqueue(sc, dst_if, m, 1); 1924 RELEASE_GLOBAL_LOCKS(); 1925 out: 1926 if (src_if != NULL) 1927 m_put_rcvif_psref(src_if, &psref_src); 1928 return; 1929 } 1930 1931 static bool 1932 bstp_state_before_learning(struct bridge_iflist *bif) 1933 { 1934 if (bif->bif_flags & IFBIF_STP) { 1935 switch (bif->bif_state) { 1936 case BSTP_IFSTATE_BLOCKING: 1937 case BSTP_IFSTATE_LISTENING: 1938 case BSTP_IFSTATE_DISABLED: 1939 return true; 1940 } 1941 } 1942 return false; 1943 } 1944 1945 static bool 1946 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1947 { 1948 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1949 1950 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1951 #if NCARP > 0 1952 || (bif->bif_ifp->if_carp && 1953 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1954 #endif /* NCARP > 0 */ 1955 ) 1956 return true; 1957 1958 return false; 1959 } 1960 1961 /* 1962 * bridge_input: 1963 * 1964 * Receive input from a member interface. Queue the packet for 1965 * bridging if it is not for us. 1966 */ 1967 static void 1968 bridge_input(struct ifnet *ifp, struct mbuf *m) 1969 { 1970 struct bridge_softc *sc = ifp->if_bridge; 1971 struct bridge_iflist *bif; 1972 struct ether_header *eh; 1973 struct psref psref; 1974 int bound; 1975 DECLARE_LOCK_VARIABLE; 1976 1977 KASSERT(!cpu_intr_p()); 1978 1979 if (__predict_false(sc == NULL) || 1980 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1981 ACQUIRE_GLOBAL_LOCKS(); 1982 ether_input(ifp, m); 1983 RELEASE_GLOBAL_LOCKS(); 1984 return; 1985 } 1986 1987 bound = curlwp_bind(); 1988 bif = bridge_lookup_member_if(sc, ifp, &psref); 1989 if (bif == NULL) { 1990 curlwp_bindx(bound); 1991 ACQUIRE_GLOBAL_LOCKS(); 1992 ether_input(ifp, m); 1993 RELEASE_GLOBAL_LOCKS(); 1994 return; 1995 } 1996 1997 eh = mtod(m, struct ether_header *); 1998 1999 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 2000 if (memcmp(etherbroadcastaddr, 2001 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 2002 m->m_flags |= M_BCAST; 2003 else 2004 m->m_flags |= M_MCAST; 2005 } 2006 2007 /* 2008 * A 'fast' path for packets addressed to interfaces that are 2009 * part of this bridge. 2010 */ 2011 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 2012 !bstp_state_before_learning(bif)) { 2013 struct bridge_iflist *_bif; 2014 struct ifnet *_ifp = NULL; 2015 int s; 2016 struct psref _psref; 2017 2018 BRIDGE_PSZ_RENTER(s); 2019 BRIDGE_IFLIST_READER_FOREACH(_bif, sc) { 2020 /* It is destined for us. */ 2021 if (bridge_ourether(_bif, eh, 0)) { 2022 bridge_acquire_member(sc, _bif, &_psref); 2023 BRIDGE_PSZ_REXIT(s); 2024 if (_bif->bif_flags & IFBIF_LEARNING) 2025 (void) bridge_rtupdate(sc, 2026 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 2027 m_set_rcvif(m, _bif->bif_ifp); 2028 _ifp = _bif->bif_ifp; 2029 bridge_release_member(sc, _bif, &_psref); 2030 goto out; 2031 } 2032 2033 /* We just received a packet that we sent out. */ 2034 if (bridge_ourether(_bif, eh, 1)) 2035 break; 2036 } 2037 BRIDGE_PSZ_REXIT(s); 2038 out: 2039 2040 if (_bif != NULL) { 2041 bridge_release_member(sc, bif, &psref); 2042 curlwp_bindx(bound); 2043 if (_ifp != NULL) { 2044 m->m_flags &= ~M_PROMISC; 2045 ACQUIRE_GLOBAL_LOCKS(); 2046 ether_input(_ifp, m); 2047 RELEASE_GLOBAL_LOCKS(); 2048 } else 2049 m_freem(m); 2050 return; 2051 } 2052 } 2053 2054 /* Tap off 802.1D packets; they do not get forwarded. */ 2055 if (bif->bif_flags & IFBIF_STP && 2056 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 2057 bstp_input(sc, bif, m); 2058 bridge_release_member(sc, bif, &psref); 2059 curlwp_bindx(bound); 2060 return; 2061 } 2062 2063 /* 2064 * A normal switch would discard the packet here, but that's not what 2065 * we've done historically. This also prevents some obnoxious behaviour. 2066 */ 2067 if (bstp_state_before_learning(bif)) { 2068 bridge_release_member(sc, bif, &psref); 2069 curlwp_bindx(bound); 2070 ACQUIRE_GLOBAL_LOCKS(); 2071 ether_input(ifp, m); 2072 RELEASE_GLOBAL_LOCKS(); 2073 return; 2074 } 2075 2076 bridge_release_member(sc, bif, &psref); 2077 2078 bridge_forward(sc, m); 2079 2080 curlwp_bindx(bound); 2081 } 2082 2083 /* 2084 * bridge_broadcast: 2085 * 2086 * Send a frame to all interfaces that are members of 2087 * the bridge, except for the one on which the packet 2088 * arrived. 2089 */ 2090 static void 2091 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2092 struct mbuf *m) 2093 { 2094 struct bridge_iflist *bif; 2095 struct mbuf *mc; 2096 struct ifnet *dst_if; 2097 bool bmcast; 2098 int s; 2099 DECLARE_LOCK_VARIABLE; 2100 2101 bmcast = m->m_flags & (M_BCAST|M_MCAST); 2102 2103 BRIDGE_PSZ_RENTER(s); 2104 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 2105 struct psref psref; 2106 2107 bridge_acquire_member(sc, bif, &psref); 2108 BRIDGE_PSZ_REXIT(s); 2109 2110 dst_if = bif->bif_ifp; 2111 2112 if (bif->bif_flags & IFBIF_STP) { 2113 switch (bif->bif_state) { 2114 case BSTP_IFSTATE_BLOCKING: 2115 case BSTP_IFSTATE_DISABLED: 2116 goto next; 2117 } 2118 } 2119 2120 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 2121 goto next; 2122 2123 if ((dst_if->if_flags & IFF_RUNNING) == 0) 2124 goto next; 2125 2126 if (dst_if != src_if) { 2127 mc = m_copypacket(m, M_DONTWAIT); 2128 if (mc == NULL) { 2129 if_statinc(&sc->sc_if, if_oerrors); 2130 goto next; 2131 } 2132 /* 2133 * Before enqueueing this packet to the destination 2134 * interface, clear any in-bound checksum flags to 2135 * prevent them from being misused as out-bound flags. 2136 */ 2137 mc->m_pkthdr.csum_flags = 0; 2138 2139 ACQUIRE_GLOBAL_LOCKS(); 2140 bridge_enqueue(sc, dst_if, mc, 1); 2141 RELEASE_GLOBAL_LOCKS(); 2142 } 2143 2144 if (bmcast) { 2145 mc = m_copypacket(m, M_DONTWAIT); 2146 if (mc == NULL) { 2147 if_statinc(&sc->sc_if, if_oerrors); 2148 goto next; 2149 } 2150 /* 2151 * Before enqueueing this packet to the destination 2152 * interface, clear any in-bound checksum flags to 2153 * prevent them from being misused as out-bound flags. 2154 */ 2155 mc->m_pkthdr.csum_flags = 0; 2156 2157 m_set_rcvif(mc, dst_if); 2158 mc->m_flags &= ~M_PROMISC; 2159 2160 ACQUIRE_GLOBAL_LOCKS(); 2161 ether_input(dst_if, mc); 2162 RELEASE_GLOBAL_LOCKS(); 2163 } 2164 next: 2165 BRIDGE_PSZ_RENTER(s); 2166 bridge_release_member(sc, bif, &psref); 2167 } 2168 BRIDGE_PSZ_REXIT(s); 2169 2170 m_freem(m); 2171 } 2172 2173 static int 2174 bridge_rtalloc(struct bridge_softc *sc, const uint8_t *dst, 2175 struct bridge_rtnode **brtp) 2176 { 2177 struct bridge_rtnode *brt; 2178 int error; 2179 2180 if (sc->sc_brtcnt >= sc->sc_brtmax) 2181 return ENOSPC; 2182 2183 /* 2184 * Allocate a new bridge forwarding node, and 2185 * initialize the expiration time and Ethernet 2186 * address. 2187 */ 2188 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 2189 if (brt == NULL) 2190 return ENOMEM; 2191 2192 memset(brt, 0, sizeof(*brt)); 2193 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2194 brt->brt_flags = IFBAF_DYNAMIC; 2195 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2196 PSLIST_ENTRY_INIT(brt, brt_list); 2197 PSLIST_ENTRY_INIT(brt, brt_hash); 2198 2199 BRIDGE_RT_LOCK(sc); 2200 error = bridge_rtnode_insert(sc, brt); 2201 BRIDGE_RT_UNLOCK(sc); 2202 2203 if (error != 0) { 2204 pool_put(&bridge_rtnode_pool, brt); 2205 return error; 2206 } 2207 2208 *brtp = brt; 2209 return 0; 2210 } 2211 2212 /* 2213 * bridge_rtupdate: 2214 * 2215 * Add a bridge routing entry. 2216 */ 2217 static int 2218 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 2219 struct ifnet *dst_if, int setflags, uint8_t flags) 2220 { 2221 struct bridge_rtnode *brt; 2222 int s; 2223 2224 again: 2225 /* 2226 * A route for this destination might already exist. If so, 2227 * update it, otherwise create a new one. 2228 */ 2229 BRIDGE_RT_RENTER(s); 2230 brt = bridge_rtnode_lookup(sc, dst); 2231 2232 if (brt != NULL) { 2233 brt->brt_ifp = dst_if; 2234 if (setflags) { 2235 brt->brt_flags = flags; 2236 if (flags & IFBAF_STATIC) 2237 brt->brt_expire = 0; 2238 else 2239 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2240 } else { 2241 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2242 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2243 } 2244 } 2245 BRIDGE_RT_REXIT(s); 2246 2247 if (brt == NULL) { 2248 int r; 2249 2250 r = bridge_rtalloc(sc, dst, &brt); 2251 if (r != 0) 2252 return r; 2253 goto again; 2254 } 2255 2256 return 0; 2257 } 2258 2259 /* 2260 * bridge_rtlookup: 2261 * 2262 * Lookup the destination interface for an address. 2263 */ 2264 static struct ifnet * 2265 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2266 { 2267 struct bridge_rtnode *brt; 2268 struct ifnet *ifs = NULL; 2269 int s; 2270 2271 BRIDGE_RT_RENTER(s); 2272 brt = bridge_rtnode_lookup(sc, addr); 2273 if (brt != NULL) 2274 ifs = brt->brt_ifp; 2275 BRIDGE_RT_REXIT(s); 2276 2277 return ifs; 2278 } 2279 2280 typedef bool (*bridge_iterate_cb_t) 2281 (struct bridge_softc *, struct bridge_rtnode *, bool *, void *); 2282 2283 /* 2284 * bridge_rtlist_iterate_remove: 2285 * 2286 * It iterates on sc->sc_rtlist and removes rtnodes of it which func 2287 * callback judges to remove. Removals of rtnodes are done in a manner 2288 * of pserialize. To this end, all kmem_* operations are placed out of 2289 * mutexes. 2290 */ 2291 static void 2292 bridge_rtlist_iterate_remove(struct bridge_softc *sc, bridge_iterate_cb_t func, void *arg) 2293 { 2294 struct bridge_rtnode *brt; 2295 struct bridge_rtnode **brt_list; 2296 int i, count; 2297 2298 retry: 2299 count = sc->sc_brtcnt; 2300 if (count == 0) 2301 return; 2302 brt_list = kmem_alloc(sizeof(*brt_list) * count, KM_SLEEP); 2303 2304 BRIDGE_RT_LOCK(sc); 2305 if (__predict_false(sc->sc_brtcnt > count)) { 2306 /* The rtnodes increased, we need more memory */ 2307 BRIDGE_RT_UNLOCK(sc); 2308 kmem_free(brt_list, sizeof(*brt_list) * count); 2309 goto retry; 2310 } 2311 2312 i = 0; 2313 /* 2314 * We don't need to use a _SAFE variant here because we know 2315 * that a removed item keeps its next pointer as-is thanks to 2316 * pslist(9) and isn't freed in the loop. 2317 */ 2318 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 2319 bool need_break = false; 2320 if (func(sc, brt, &need_break, arg)) { 2321 bridge_rtnode_remove(sc, brt); 2322 brt_list[i++] = brt; 2323 } 2324 if (need_break) 2325 break; 2326 } 2327 2328 if (i > 0) 2329 BRIDGE_RT_PSZ_PERFORM(sc); 2330 BRIDGE_RT_UNLOCK(sc); 2331 2332 while (--i >= 0) 2333 bridge_rtnode_destroy(brt_list[i]); 2334 2335 kmem_free(brt_list, sizeof(*brt_list) * count); 2336 } 2337 2338 static bool 2339 bridge_rttrim0_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2340 bool *need_break, void *arg) 2341 { 2342 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2343 /* Take into account of the subsequent removal */ 2344 if ((sc->sc_brtcnt - 1) <= sc->sc_brtmax) 2345 *need_break = true; 2346 return true; 2347 } else 2348 return false; 2349 } 2350 2351 static void 2352 bridge_rttrim0(struct bridge_softc *sc) 2353 { 2354 bridge_rtlist_iterate_remove(sc, bridge_rttrim0_cb, NULL); 2355 } 2356 2357 /* 2358 * bridge_rttrim: 2359 * 2360 * Trim the routine table so that we have a number 2361 * of routing entries less than or equal to the 2362 * maximum number. 2363 */ 2364 static void 2365 bridge_rttrim(struct bridge_softc *sc) 2366 { 2367 2368 /* Make sure we actually need to do this. */ 2369 if (sc->sc_brtcnt <= sc->sc_brtmax) 2370 return; 2371 2372 /* Force an aging cycle; this might trim enough addresses. */ 2373 bridge_rtage(sc); 2374 if (sc->sc_brtcnt <= sc->sc_brtmax) 2375 return; 2376 2377 bridge_rttrim0(sc); 2378 2379 return; 2380 } 2381 2382 /* 2383 * bridge_timer: 2384 * 2385 * Aging timer for the bridge. 2386 */ 2387 static void 2388 bridge_timer(void *arg) 2389 { 2390 struct bridge_softc *sc = arg; 2391 2392 workqueue_enqueue(sc->sc_rtage_wq, &sc->sc_rtage_wk, NULL); 2393 } 2394 2395 static void 2396 bridge_rtage_work(struct work *wk, void *arg) 2397 { 2398 struct bridge_softc *sc = arg; 2399 2400 KASSERT(wk == &sc->sc_rtage_wk); 2401 2402 bridge_rtage(sc); 2403 2404 if (sc->sc_if.if_flags & IFF_RUNNING) 2405 callout_reset(&sc->sc_brcallout, 2406 bridge_rtable_prune_period * hz, bridge_timer, sc); 2407 } 2408 2409 static bool 2410 bridge_rtage_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2411 bool *need_break, void *arg) 2412 { 2413 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2414 time_uptime >= brt->brt_expire) 2415 return true; 2416 else 2417 return false; 2418 } 2419 2420 /* 2421 * bridge_rtage: 2422 * 2423 * Perform an aging cycle. 2424 */ 2425 static void 2426 bridge_rtage(struct bridge_softc *sc) 2427 { 2428 bridge_rtlist_iterate_remove(sc, bridge_rtage_cb, NULL); 2429 } 2430 2431 2432 static bool 2433 bridge_rtflush_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2434 bool *need_break, void *arg) 2435 { 2436 int full = *(int*)arg; 2437 2438 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2439 return true; 2440 else 2441 return false; 2442 } 2443 2444 /* 2445 * bridge_rtflush: 2446 * 2447 * Remove all dynamic addresses from the bridge. 2448 */ 2449 static void 2450 bridge_rtflush(struct bridge_softc *sc, int full) 2451 { 2452 bridge_rtlist_iterate_remove(sc, bridge_rtflush_cb, &full); 2453 } 2454 2455 /* 2456 * bridge_rtdaddr: 2457 * 2458 * Remove an address from the table. 2459 */ 2460 static int 2461 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2462 { 2463 struct bridge_rtnode *brt; 2464 2465 BRIDGE_RT_LOCK(sc); 2466 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2467 BRIDGE_RT_UNLOCK(sc); 2468 return ENOENT; 2469 } 2470 bridge_rtnode_remove(sc, brt); 2471 BRIDGE_RT_PSZ_PERFORM(sc); 2472 BRIDGE_RT_UNLOCK(sc); 2473 2474 bridge_rtnode_destroy(brt); 2475 2476 return 0; 2477 } 2478 2479 /* 2480 * bridge_rtdelete: 2481 * 2482 * Delete routes to a speicifc member interface. 2483 */ 2484 static void 2485 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2486 { 2487 struct bridge_rtnode *brt; 2488 2489 /* XXX pserialize_perform for each entry is slow */ 2490 again: 2491 BRIDGE_RT_LOCK(sc); 2492 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 2493 if (brt->brt_ifp == ifp) 2494 break; 2495 } 2496 if (brt == NULL) { 2497 BRIDGE_RT_UNLOCK(sc); 2498 return; 2499 } 2500 bridge_rtnode_remove(sc, brt); 2501 BRIDGE_RT_PSZ_PERFORM(sc); 2502 BRIDGE_RT_UNLOCK(sc); 2503 2504 bridge_rtnode_destroy(brt); 2505 2506 goto again; 2507 } 2508 2509 /* 2510 * bridge_rtable_init: 2511 * 2512 * Initialize the route table for this bridge. 2513 */ 2514 static void 2515 bridge_rtable_init(struct bridge_softc *sc) 2516 { 2517 int i; 2518 2519 sc->sc_rthash = kmem_alloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2520 KM_SLEEP); 2521 2522 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2523 PSLIST_INIT(&sc->sc_rthash[i]); 2524 2525 sc->sc_rthash_key = cprng_fast32(); 2526 2527 PSLIST_INIT(&sc->sc_rtlist); 2528 2529 sc->sc_rtlist_psz = pserialize_create(); 2530 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 2531 } 2532 2533 /* 2534 * bridge_rtable_fini: 2535 * 2536 * Deconstruct the route table for this bridge. 2537 */ 2538 static void 2539 bridge_rtable_fini(struct bridge_softc *sc) 2540 { 2541 2542 kmem_free(sc->sc_rthash, sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE); 2543 mutex_obj_free(sc->sc_rtlist_lock); 2544 pserialize_destroy(sc->sc_rtlist_psz); 2545 } 2546 2547 /* 2548 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2549 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2550 */ 2551 #define mix(a, b, c) \ 2552 do { \ 2553 a -= b; a -= c; a ^= (c >> 13); \ 2554 b -= c; b -= a; b ^= (a << 8); \ 2555 c -= a; c -= b; c ^= (b >> 13); \ 2556 a -= b; a -= c; a ^= (c >> 12); \ 2557 b -= c; b -= a; b ^= (a << 16); \ 2558 c -= a; c -= b; c ^= (b >> 5); \ 2559 a -= b; a -= c; a ^= (c >> 3); \ 2560 b -= c; b -= a; b ^= (a << 10); \ 2561 c -= a; c -= b; c ^= (b >> 15); \ 2562 } while (/*CONSTCOND*/0) 2563 2564 static inline uint32_t 2565 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2566 { 2567 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2568 2569 b += addr[5] << 8; 2570 b += addr[4]; 2571 a += (uint32_t)addr[3] << 24; 2572 a += addr[2] << 16; 2573 a += addr[1] << 8; 2574 a += addr[0]; 2575 2576 mix(a, b, c); 2577 2578 return (c & BRIDGE_RTHASH_MASK); 2579 } 2580 2581 #undef mix 2582 2583 /* 2584 * bridge_rtnode_lookup: 2585 * 2586 * Look up a bridge route node for the specified destination. 2587 */ 2588 static struct bridge_rtnode * 2589 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2590 { 2591 struct bridge_rtnode *brt; 2592 uint32_t hash; 2593 int dir; 2594 2595 hash = bridge_rthash(sc, addr); 2596 BRIDGE_RTHASH_READER_FOREACH(brt, sc, hash) { 2597 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2598 if (dir == 0) 2599 return brt; 2600 if (dir > 0) 2601 return NULL; 2602 } 2603 2604 return NULL; 2605 } 2606 2607 /* 2608 * bridge_rtnode_insert: 2609 * 2610 * Insert the specified bridge node into the route table. We 2611 * assume the entry is not already in the table. 2612 */ 2613 static int 2614 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2615 { 2616 struct bridge_rtnode *lbrt, *prev = NULL; 2617 uint32_t hash; 2618 2619 KASSERT(BRIDGE_RT_LOCKED(sc)); 2620 2621 hash = bridge_rthash(sc, brt->brt_addr); 2622 BRIDGE_RTHASH_WRITER_FOREACH(lbrt, sc, hash) { 2623 int dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2624 if (dir == 0) 2625 return EEXIST; 2626 if (dir > 0) 2627 break; 2628 prev = lbrt; 2629 } 2630 if (prev == NULL) 2631 BRIDGE_RTHASH_WRITER_INSERT_HEAD(sc, hash, brt); 2632 else 2633 BRIDGE_RTHASH_WRITER_INSERT_AFTER(prev, brt); 2634 2635 BRIDGE_RTLIST_WRITER_INSERT_HEAD(sc, brt); 2636 sc->sc_brtcnt++; 2637 2638 return 0; 2639 } 2640 2641 /* 2642 * bridge_rtnode_remove: 2643 * 2644 * Remove a bridge rtnode from the rthash and the rtlist of a bridge. 2645 */ 2646 static void 2647 bridge_rtnode_remove(struct bridge_softc *sc, struct bridge_rtnode *brt) 2648 { 2649 2650 KASSERT(BRIDGE_RT_LOCKED(sc)); 2651 2652 BRIDGE_RTHASH_WRITER_REMOVE(brt); 2653 BRIDGE_RTLIST_WRITER_REMOVE(brt); 2654 sc->sc_brtcnt--; 2655 } 2656 2657 /* 2658 * bridge_rtnode_destroy: 2659 * 2660 * Destroy a bridge rtnode. 2661 */ 2662 static void 2663 bridge_rtnode_destroy(struct bridge_rtnode *brt) 2664 { 2665 2666 PSLIST_ENTRY_DESTROY(brt, brt_list); 2667 PSLIST_ENTRY_DESTROY(brt, brt_hash); 2668 pool_put(&bridge_rtnode_pool, brt); 2669 } 2670 2671 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2672 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2673 2674 /* 2675 * Send bridge packets through IPF if they are one of the types IPF can deal 2676 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2677 * question.) 2678 */ 2679 static int 2680 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2681 { 2682 int snap, error; 2683 struct ether_header *eh1, eh2; 2684 struct llc llc1; 2685 uint16_t ether_type; 2686 2687 snap = 0; 2688 error = -1; /* Default error if not error == 0 */ 2689 eh1 = mtod(*mp, struct ether_header *); 2690 ether_type = ntohs(eh1->ether_type); 2691 2692 /* 2693 * Check for SNAP/LLC. 2694 */ 2695 if (ether_type < ETHERMTU) { 2696 struct llc *llc2 = (struct llc *)(eh1 + 1); 2697 2698 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2699 llc2->llc_dsap == LLC_SNAP_LSAP && 2700 llc2->llc_ssap == LLC_SNAP_LSAP && 2701 llc2->llc_control == LLC_UI) { 2702 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2703 snap = 1; 2704 } 2705 } 2706 2707 /* 2708 * If we're trying to filter bridge traffic, don't look at anything 2709 * other than IP and ARP traffic. If the filter doesn't understand 2710 * IPv6, don't allow IPv6 through the bridge either. This is lame 2711 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2712 * but of course we don't have an AppleTalk filter to begin with. 2713 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2714 * ARP traffic.) 2715 */ 2716 switch (ether_type) { 2717 case ETHERTYPE_ARP: 2718 case ETHERTYPE_REVARP: 2719 return 0; /* Automatically pass */ 2720 case ETHERTYPE_IP: 2721 # ifdef INET6 2722 case ETHERTYPE_IPV6: 2723 # endif /* INET6 */ 2724 break; 2725 default: 2726 goto bad; 2727 } 2728 2729 /* Strip off the Ethernet header and keep a copy. */ 2730 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2731 m_adj(*mp, ETHER_HDR_LEN); 2732 2733 /* Strip off snap header, if present */ 2734 if (snap) { 2735 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2736 m_adj(*mp, sizeof(struct llc)); 2737 } 2738 2739 /* 2740 * Check basic packet sanity and run IPF through pfil. 2741 */ 2742 KASSERT(!cpu_intr_p()); 2743 switch (ether_type) 2744 { 2745 case ETHERTYPE_IP : 2746 error = bridge_ip_checkbasic(mp); 2747 if (error == 0) 2748 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2749 break; 2750 # ifdef INET6 2751 case ETHERTYPE_IPV6 : 2752 error = bridge_ip6_checkbasic(mp); 2753 if (error == 0) 2754 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2755 break; 2756 # endif 2757 default : 2758 error = 0; 2759 break; 2760 } 2761 2762 if (*mp == NULL) 2763 return error; 2764 if (error != 0) 2765 goto bad; 2766 2767 error = -1; 2768 2769 /* 2770 * Finally, put everything back the way it was and return 2771 */ 2772 if (snap) { 2773 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2774 if (*mp == NULL) 2775 return error; 2776 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2777 } 2778 2779 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2780 if (*mp == NULL) 2781 return error; 2782 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2783 2784 return 0; 2785 2786 bad: 2787 m_freem(*mp); 2788 *mp = NULL; 2789 return error; 2790 } 2791 2792 /* 2793 * Perform basic checks on header size since 2794 * IPF assumes ip_input has already processed 2795 * it for it. Cut-and-pasted from ip_input.c. 2796 * Given how simple the IPv6 version is, 2797 * does the IPv4 version really need to be 2798 * this complicated? 2799 * 2800 * XXX Should we update ipstat here, or not? 2801 * XXX Right now we update ipstat but not 2802 * XXX csum_counter. 2803 */ 2804 static int 2805 bridge_ip_checkbasic(struct mbuf **mp) 2806 { 2807 struct mbuf *m = *mp; 2808 struct ip *ip; 2809 int len, hlen; 2810 2811 if (*mp == NULL) 2812 return -1; 2813 2814 if (M_GET_ALIGNED_HDR(&m, struct ip, true) != 0) { 2815 /* XXXJRT new stat, please */ 2816 ip_statinc(IP_STAT_TOOSMALL); 2817 goto bad; 2818 } 2819 ip = mtod(m, struct ip *); 2820 if (ip == NULL) goto bad; 2821 2822 if (ip->ip_v != IPVERSION) { 2823 ip_statinc(IP_STAT_BADVERS); 2824 goto bad; 2825 } 2826 hlen = ip->ip_hl << 2; 2827 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2828 ip_statinc(IP_STAT_BADHLEN); 2829 goto bad; 2830 } 2831 if (hlen > m->m_len) { 2832 if ((m = m_pullup(m, hlen)) == 0) { 2833 ip_statinc(IP_STAT_BADHLEN); 2834 goto bad; 2835 } 2836 ip = mtod(m, struct ip *); 2837 if (ip == NULL) goto bad; 2838 } 2839 2840 switch (m->m_pkthdr.csum_flags & 2841 ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_IPv4) | 2842 M_CSUM_IPv4_BAD)) { 2843 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2844 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2845 goto bad; 2846 2847 case M_CSUM_IPv4: 2848 /* Checksum was okay. */ 2849 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2850 break; 2851 2852 default: 2853 /* Must compute it ourselves. */ 2854 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2855 if (in_cksum(m, hlen) != 0) 2856 goto bad; 2857 break; 2858 } 2859 2860 /* Retrieve the packet length. */ 2861 len = ntohs(ip->ip_len); 2862 2863 /* 2864 * Check for additional length bogosity 2865 */ 2866 if (len < hlen) { 2867 ip_statinc(IP_STAT_BADLEN); 2868 goto bad; 2869 } 2870 2871 /* 2872 * Check that the amount of data in the buffers 2873 * is as at least much as the IP header would have us expect. 2874 * Drop packet if shorter than we expect. 2875 */ 2876 if (m->m_pkthdr.len < len) { 2877 ip_statinc(IP_STAT_TOOSHORT); 2878 goto bad; 2879 } 2880 2881 /* Checks out, proceed */ 2882 *mp = m; 2883 return 0; 2884 2885 bad: 2886 *mp = m; 2887 return -1; 2888 } 2889 2890 # ifdef INET6 2891 /* 2892 * Same as above, but for IPv6. 2893 * Cut-and-pasted from ip6_input.c. 2894 * XXX Should we update ip6stat, or not? 2895 */ 2896 static int 2897 bridge_ip6_checkbasic(struct mbuf **mp) 2898 { 2899 struct mbuf *m = *mp; 2900 struct ip6_hdr *ip6; 2901 2902 /* 2903 * If the IPv6 header is not aligned, slurp it up into a new 2904 * mbuf with space for link headers, in the event we forward 2905 * it. Otherwise, if it is aligned, make sure the entire base 2906 * IPv6 header is in the first mbuf of the chain. 2907 */ 2908 if (M_GET_ALIGNED_HDR(&m, struct ip6_hdr, true) != 0) { 2909 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2910 /* XXXJRT new stat, please */ 2911 ip6_statinc(IP6_STAT_TOOSMALL); 2912 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2913 goto bad; 2914 } 2915 2916 ip6 = mtod(m, struct ip6_hdr *); 2917 2918 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2919 ip6_statinc(IP6_STAT_BADVERS); 2920 in6_ifstat_inc(m_get_rcvif_NOMPSAFE(m), ifs6_in_hdrerr); 2921 goto bad; 2922 } 2923 2924 /* Checks out, proceed */ 2925 *mp = m; 2926 return 0; 2927 2928 bad: 2929 *mp = m; 2930 return -1; 2931 } 2932 # endif /* INET6 */ 2933
Indexes created Thu Oct 02 14:10:14 GMT 2025