if_bridge.c revision 1.190
1 /* $NetBSD: if_bridge.c,v 1.190 2024/06/29 12:11:12 riastradh 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 1.190 2024/06/29 12:11:12 riastradh 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 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 const int 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 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 = 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 = 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 if (vlan_has_tag(m) && 1506 !vlan_is_hwtag_enabled(dst_ifp)) { 1507 (void)ether_inject_vlantag(&m, ETHERTYPE_VLAN, 1508 vlan_get_tag(m)); 1509 if (m == NULL) { 1510 if_statinc(&sc->sc_if, if_oerrors); 1511 return; 1512 } 1513 } 1514 1515 len = m->m_pkthdr.len; 1516 mflags = m->m_flags; 1517 1518 error = if_transmit_lock(dst_ifp, m); 1519 if (error) { 1520 /* mbuf is already freed */ 1521 if_statinc(&sc->sc_if, if_oerrors); 1522 return; 1523 } 1524 1525 net_stat_ref_t nsr = IF_STAT_GETREF(&sc->sc_if); 1526 if_statinc_ref(&sc->sc_if, nsr, if_opackets); 1527 if_statadd_ref(&sc->sc_if, nsr, if_obytes, len); 1528 if (mflags & M_MCAST) 1529 if_statinc_ref(&sc->sc_if, nsr, if_omcasts); 1530 IF_STAT_PUTREF(&sc->sc_if); 1531 } 1532 1533 /* 1534 * bridge_output: 1535 * 1536 * Send output from a bridge member interface. This 1537 * performs the bridging function for locally originated 1538 * packets. 1539 * 1540 * The mbuf has the Ethernet header already attached. We must 1541 * enqueue or free the mbuf before returning. 1542 */ 1543 int 1544 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1545 const struct rtentry *rt) 1546 { 1547 struct ether_header *eh; 1548 struct ifnet *dst_if; 1549 struct bridge_softc *sc; 1550 struct mbuf *n; 1551 int s; 1552 1553 /* 1554 * bridge_output() is called from ether_output(), furthermore 1555 * ifp argument doesn't point to bridge(4). So, don't assert 1556 * IFEF_MPSAFE here. 1557 */ 1558 1559 KASSERT(m->m_len >= ETHER_HDR_LEN); 1560 1561 eh = mtod(m, struct ether_header *); 1562 sc = ifp->if_bridge; 1563 1564 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1565 if (memcmp(etherbroadcastaddr, 1566 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1567 m->m_flags |= M_BCAST; 1568 else 1569 m->m_flags |= M_MCAST; 1570 } 1571 1572 /* 1573 * If bridge is down, but the original output interface is up, 1574 * go ahead and send out that interface. Otherwise, the packet 1575 * is dropped below. 1576 */ 1577 if (__predict_false(sc == NULL) || 1578 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1579 dst_if = ifp; 1580 goto unicast_asis; 1581 } 1582 1583 /* 1584 * If the packet is a multicast, or we don't know a better way to 1585 * get there, send to all interfaces. 1586 */ 1587 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0) 1588 dst_if = NULL; 1589 else 1590 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1591 1592 /* 1593 * In general, we need to handle TX offload in software before 1594 * enqueueing a packet. However, we can send it as is in the 1595 * cases of unicast via (1) the source interface, or (2) an 1596 * interface which supports the specified offload options. 1597 * For multicast or broadcast, send it as is only if (3) all 1598 * the member interfaces support the specified options. 1599 */ 1600 1601 /* 1602 * Unicast via the source interface. 1603 */ 1604 if (dst_if == ifp) 1605 goto unicast_asis; 1606 1607 /* 1608 * Unicast via other interface. 1609 */ 1610 if (dst_if != NULL) { 1611 KASSERT(m->m_flags & M_PKTHDR); 1612 if (TX_OFFLOAD_SUPPORTED(dst_if->if_csum_flags_tx, 1613 m->m_pkthdr.csum_flags)) { 1614 /* 1615 * Unicast via an interface which supports the 1616 * specified offload options. 1617 */ 1618 goto unicast_asis; 1619 } 1620 1621 /* 1622 * Handle TX offload in software. For TSO, a packet is 1623 * split into multiple chunks. Thus, the return value of 1624 * ether_sw_offload_tx() is mbuf queue consists of them. 1625 */ 1626 m = ether_sw_offload_tx(ifp, m); 1627 if (m == NULL) 1628 return 0; 1629 1630 do { 1631 n = m->m_nextpkt; 1632 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1633 m_freem(m); 1634 else 1635 bridge_enqueue(sc, dst_if, m, 0); 1636 m = n; 1637 } while (m != NULL); 1638 1639 return 0; 1640 } 1641 1642 /* 1643 * Multicast or broadcast. 1644 */ 1645 if (TX_OFFLOAD_SUPPORTED(sc->sc_csum_flags_tx, 1646 m->m_pkthdr.csum_flags)) { 1647 /* 1648 * Specified TX offload options are supported by all 1649 * the member interfaces of this bridge. 1650 */ 1651 m->m_nextpkt = NULL; /* XXX */ 1652 } else { 1653 /* 1654 * Otherwise, handle TX offload in software. 1655 */ 1656 m = ether_sw_offload_tx(ifp, m); 1657 if (m == NULL) 1658 return 0; 1659 } 1660 1661 do { 1662 /* XXX Should call bridge_broadcast, but there are locking 1663 * issues which need resolving first. */ 1664 struct bridge_iflist *bif; 1665 struct mbuf *mc; 1666 bool used = false; 1667 1668 n = m->m_nextpkt; 1669 1670 BRIDGE_PSZ_RENTER(s); 1671 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1672 struct psref psref; 1673 1674 bridge_acquire_member(sc, bif, &psref); 1675 BRIDGE_PSZ_REXIT(s); 1676 1677 dst_if = bif->bif_ifp; 1678 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1679 goto next; 1680 1681 /* 1682 * If this is not the original output interface, 1683 * and the interface is participating in spanning 1684 * tree, make sure the port is in a state that 1685 * allows forwarding. 1686 */ 1687 if (dst_if != ifp && 1688 (bif->bif_flags & IFBIF_STP) != 0) { 1689 switch (bif->bif_state) { 1690 case BSTP_IFSTATE_BLOCKING: 1691 case BSTP_IFSTATE_LISTENING: 1692 case BSTP_IFSTATE_DISABLED: 1693 goto next; 1694 } 1695 } 1696 1697 if (PSLIST_READER_NEXT(bif, struct bridge_iflist, 1698 bif_next) == NULL && 1699 ((m->m_flags & (M_MCAST | M_BCAST)) == 0 || 1700 dst_if == ifp)) 1701 { 1702 used = true; 1703 mc = m; 1704 } else { 1705 mc = m_copypacket(m, M_DONTWAIT); 1706 if (mc == NULL) { 1707 if_statinc(&sc->sc_if, if_oerrors); 1708 goto next; 1709 } 1710 } 1711 1712 bridge_enqueue(sc, dst_if, mc, 0); 1713 1714 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0 && 1715 dst_if != ifp) 1716 { 1717 if (PSLIST_READER_NEXT(bif, 1718 struct bridge_iflist, bif_next) == NULL) 1719 { 1720 used = true; 1721 mc = m; 1722 } else { 1723 mc = m_copypacket(m, M_DONTWAIT); 1724 if (mc == NULL) { 1725 if_statinc(&sc->sc_if, 1726 if_oerrors); 1727 goto next; 1728 } 1729 } 1730 1731 m_set_rcvif(mc, dst_if); 1732 mc->m_flags &= ~M_PROMISC; 1733 1734 const int _s = splsoftnet(); 1735 KERNEL_LOCK_UNLESS_IFP_MPSAFE(dst_if); 1736 ether_input(dst_if, mc); 1737 KERNEL_UNLOCK_UNLESS_IFP_MPSAFE(dst_if); 1738 splx(_s); 1739 } 1740 1741 next: 1742 BRIDGE_PSZ_RENTER(s); 1743 bridge_release_member(sc, bif, &psref); 1744 1745 /* Guarantee we don't re-enter the loop as we already 1746 * decided we're at the end. */ 1747 if (used) 1748 break; 1749 } 1750 BRIDGE_PSZ_REXIT(s); 1751 1752 if (!used) 1753 m_freem(m); 1754 1755 m = n; 1756 } while (m != NULL); 1757 return 0; 1758 1759 unicast_asis: 1760 /* 1761 * XXX Spanning tree consideration here? 1762 */ 1763 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1764 m_freem(m); 1765 else 1766 bridge_enqueue(sc, dst_if, m, 0); 1767 return 0; 1768 } 1769 1770 /* 1771 * bridge_start: 1772 * 1773 * Start output on a bridge. 1774 * 1775 * NOTE: This routine should never be called in this implementation. 1776 */ 1777 static void 1778 bridge_start(struct ifnet *ifp) 1779 { 1780 1781 printf("%s: bridge_start() called\n", ifp->if_xname); 1782 } 1783 1784 /* 1785 * bridge_forward: 1786 * 1787 * The forwarding function of the bridge. 1788 */ 1789 static void 1790 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1791 { 1792 struct bridge_iflist *bif; 1793 struct ifnet *src_if, *dst_if; 1794 struct ether_header *eh; 1795 struct psref psref; 1796 struct psref psref_src; 1797 DECLARE_LOCK_VARIABLE; 1798 1799 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1800 return; 1801 1802 src_if = m_get_rcvif_psref(m, &psref_src); 1803 if (src_if == NULL) { 1804 /* Interface is being destroyed? */ 1805 m_freem(m); 1806 goto out; 1807 } 1808 1809 if_statadd2(&sc->sc_if, if_ipackets, 1, if_ibytes, m->m_pkthdr.len); 1810 1811 /* 1812 * Look up the bridge_iflist. 1813 */ 1814 bif = bridge_lookup_member_if(sc, src_if, &psref); 1815 if (bif == NULL) { 1816 /* Interface is not a bridge member (anymore?) */ 1817 m_freem(m); 1818 goto out; 1819 } 1820 1821 if (bif->bif_flags & IFBIF_STP) { 1822 switch (bif->bif_state) { 1823 case BSTP_IFSTATE_BLOCKING: 1824 case BSTP_IFSTATE_LISTENING: 1825 case BSTP_IFSTATE_DISABLED: 1826 m_freem(m); 1827 bridge_release_member(sc, bif, &psref); 1828 goto out; 1829 } 1830 } 1831 1832 eh = mtod(m, struct ether_header *); 1833 1834 /* 1835 * If the interface is learning, and the source 1836 * address is valid and not multicast, record 1837 * the address. 1838 */ 1839 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1840 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1841 (eh->ether_shost[0] == 0 && 1842 eh->ether_shost[1] == 0 && 1843 eh->ether_shost[2] == 0 && 1844 eh->ether_shost[3] == 0 && 1845 eh->ether_shost[4] == 0 && 1846 eh->ether_shost[5] == 0) == 0) { 1847 (void) bridge_rtupdate(sc, eh->ether_shost, 1848 src_if, 0, IFBAF_DYNAMIC); 1849 } 1850 1851 if ((bif->bif_flags & IFBIF_STP) != 0 && 1852 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1853 m_freem(m); 1854 bridge_release_member(sc, bif, &psref); 1855 goto out; 1856 } 1857 1858 bridge_release_member(sc, bif, &psref); 1859 1860 /* 1861 * At this point, the port either doesn't participate 1862 * in spanning tree or it is in the forwarding state. 1863 */ 1864 1865 /* 1866 * If the packet is unicast, destined for someone on 1867 * "this" side of the bridge, drop it. 1868 */ 1869 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1870 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1871 if (src_if == dst_if) { 1872 m_freem(m); 1873 goto out; 1874 } 1875 } else { 1876 /* ...forward it to all interfaces. */ 1877 if_statinc(&sc->sc_if, if_imcasts); 1878 dst_if = NULL; 1879 } 1880 1881 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, src_if, PFIL_IN) != 0) { 1882 if (m != NULL) 1883 m_freem(m); 1884 goto out; 1885 } 1886 if (m == NULL) 1887 goto out; 1888 1889 if (dst_if == NULL) { 1890 bridge_broadcast(sc, src_if, m); 1891 goto out; 1892 } 1893 1894 m_put_rcvif_psref(src_if, &psref_src); 1895 src_if = NULL; 1896 1897 /* 1898 * At this point, we're dealing with a unicast frame 1899 * going to a different interface. 1900 */ 1901 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1902 m_freem(m); 1903 goto out; 1904 } 1905 1906 bif = bridge_lookup_member_if(sc, dst_if, &psref); 1907 if (bif == NULL) { 1908 /* Not a member of the bridge (anymore?) */ 1909 m_freem(m); 1910 goto out; 1911 } 1912 1913 if (bif->bif_flags & IFBIF_STP) { 1914 switch (bif->bif_state) { 1915 case BSTP_IFSTATE_DISABLED: 1916 case BSTP_IFSTATE_BLOCKING: 1917 m_freem(m); 1918 bridge_release_member(sc, bif, &psref); 1919 goto out; 1920 } 1921 } 1922 1923 bridge_release_member(sc, bif, &psref); 1924 1925 /* 1926 * Before enqueueing this packet to the destination interface, 1927 * clear any in-bound checksum flags to prevent them from being 1928 * misused as out-bound flags. 1929 */ 1930 m->m_pkthdr.csum_flags = 0; 1931 1932 ACQUIRE_GLOBAL_LOCKS(); 1933 bridge_enqueue(sc, dst_if, m, 1); 1934 RELEASE_GLOBAL_LOCKS(); 1935 out: 1936 if (src_if != NULL) 1937 m_put_rcvif_psref(src_if, &psref_src); 1938 return; 1939 } 1940 1941 static bool 1942 bstp_state_before_learning(struct bridge_iflist *bif) 1943 { 1944 if (bif->bif_flags & IFBIF_STP) { 1945 switch (bif->bif_state) { 1946 case BSTP_IFSTATE_BLOCKING: 1947 case BSTP_IFSTATE_LISTENING: 1948 case BSTP_IFSTATE_DISABLED: 1949 return true; 1950 } 1951 } 1952 return false; 1953 } 1954 1955 static bool 1956 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1957 { 1958 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1959 1960 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1961 #if NCARP > 0 1962 || (bif->bif_ifp->if_carp && 1963 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1964 #endif /* NCARP > 0 */ 1965 ) 1966 return true; 1967 1968 return false; 1969 } 1970 1971 /* 1972 * bridge_input: 1973 * 1974 * Receive input from a member interface. Queue the packet for 1975 * bridging if it is not for us. 1976 */ 1977 static void 1978 bridge_input(struct ifnet *ifp, struct mbuf *m) 1979 { 1980 struct bridge_softc *sc = ifp->if_bridge; 1981 struct bridge_iflist *bif; 1982 struct ether_header *eh; 1983 struct psref psref; 1984 int bound; 1985 DECLARE_LOCK_VARIABLE; 1986 1987 KASSERT(!cpu_intr_p()); 1988 1989 if (__predict_false(sc == NULL) || 1990 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1991 ACQUIRE_GLOBAL_LOCKS(); 1992 ether_input(ifp, m); 1993 RELEASE_GLOBAL_LOCKS(); 1994 return; 1995 } 1996 1997 bound = curlwp_bind(); 1998 bif = bridge_lookup_member_if(sc, ifp, &psref); 1999 if (bif == NULL) { 2000 curlwp_bindx(bound); 2001 ACQUIRE_GLOBAL_LOCKS(); 2002 ether_input(ifp, m); 2003 RELEASE_GLOBAL_LOCKS(); 2004 return; 2005 } 2006 2007 eh = mtod(m, struct ether_header *); 2008 2009 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 2010 if (memcmp(etherbroadcastaddr, 2011 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 2012 m->m_flags |= M_BCAST; 2013 else 2014 m->m_flags |= M_MCAST; 2015 } 2016 2017 /* 2018 * A 'fast' path for packets addressed to interfaces that are 2019 * part of this bridge. 2020 */ 2021 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 2022 !bstp_state_before_learning(bif)) { 2023 struct bridge_iflist *_bif; 2024 struct ifnet *_ifp = NULL; 2025 int s; 2026 struct psref _psref; 2027 2028 BRIDGE_PSZ_RENTER(s); 2029 BRIDGE_IFLIST_READER_FOREACH(_bif, sc) { 2030 /* It is destined for us. */ 2031 if (bridge_ourether(_bif, eh, 0)) { 2032 bridge_acquire_member(sc, _bif, &_psref); 2033 BRIDGE_PSZ_REXIT(s); 2034 if (_bif->bif_flags & IFBIF_LEARNING) 2035 (void) bridge_rtupdate(sc, 2036 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 2037 m_set_rcvif(m, _bif->bif_ifp); 2038 _ifp = _bif->bif_ifp; 2039 bridge_release_member(sc, _bif, &_psref); 2040 goto out; 2041 } 2042 2043 /* We just received a packet that we sent out. */ 2044 if (bridge_ourether(_bif, eh, 1)) 2045 break; 2046 } 2047 BRIDGE_PSZ_REXIT(s); 2048 out: 2049 2050 if (_bif != NULL) { 2051 bridge_release_member(sc, bif, &psref); 2052 curlwp_bindx(bound); 2053 if (_ifp != NULL) { 2054 m->m_flags &= ~M_PROMISC; 2055 ACQUIRE_GLOBAL_LOCKS(); 2056 ether_input(_ifp, m); 2057 RELEASE_GLOBAL_LOCKS(); 2058 } else 2059 m_freem(m); 2060 return; 2061 } 2062 } 2063 2064 /* Tap off 802.1D packets; they do not get forwarded. */ 2065 if (bif->bif_flags & IFBIF_STP && 2066 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 2067 bstp_input(sc, bif, m); 2068 bridge_release_member(sc, bif, &psref); 2069 curlwp_bindx(bound); 2070 return; 2071 } 2072 2073 /* 2074 * A normal switch would discard the packet here, but that's not what 2075 * we've done historically. This also prevents some obnoxious behaviour. 2076 */ 2077 if (bstp_state_before_learning(bif)) { 2078 bridge_release_member(sc, bif, &psref); 2079 curlwp_bindx(bound); 2080 ACQUIRE_GLOBAL_LOCKS(); 2081 ether_input(ifp, m); 2082 RELEASE_GLOBAL_LOCKS(); 2083 return; 2084 } 2085 2086 bridge_release_member(sc, bif, &psref); 2087 2088 bridge_forward(sc, m); 2089 2090 curlwp_bindx(bound); 2091 } 2092 2093 /* 2094 * bridge_broadcast: 2095 * 2096 * Send a frame to all interfaces that are members of 2097 * the bridge, except for the one on which the packet 2098 * arrived. 2099 */ 2100 static void 2101 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2102 struct mbuf *m) 2103 { 2104 struct bridge_iflist *bif; 2105 struct mbuf *mc; 2106 struct ifnet *dst_if; 2107 bool bmcast; 2108 int s; 2109 DECLARE_LOCK_VARIABLE; 2110 2111 bmcast = m->m_flags & (M_BCAST|M_MCAST); 2112 2113 BRIDGE_PSZ_RENTER(s); 2114 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 2115 struct psref psref; 2116 2117 bridge_acquire_member(sc, bif, &psref); 2118 BRIDGE_PSZ_REXIT(s); 2119 2120 dst_if = bif->bif_ifp; 2121 2122 if (bif->bif_flags & IFBIF_STP) { 2123 switch (bif->bif_state) { 2124 case BSTP_IFSTATE_BLOCKING: 2125 case BSTP_IFSTATE_DISABLED: 2126 goto next; 2127 } 2128 } 2129 2130 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 2131 goto next; 2132 2133 if ((dst_if->if_flags & IFF_RUNNING) == 0) 2134 goto next; 2135 2136 if (dst_if != src_if) { 2137 mc = m_copypacket(m, M_DONTWAIT); 2138 if (mc == NULL) { 2139 if_statinc(&sc->sc_if, if_oerrors); 2140 goto next; 2141 } 2142 /* 2143 * Before enqueueing this packet to the destination 2144 * interface, clear any in-bound checksum flags to 2145 * prevent them from being misused as out-bound flags. 2146 */ 2147 mc->m_pkthdr.csum_flags = 0; 2148 2149 ACQUIRE_GLOBAL_LOCKS(); 2150 bridge_enqueue(sc, dst_if, mc, 1); 2151 RELEASE_GLOBAL_LOCKS(); 2152 } 2153 2154 if (bmcast) { 2155 mc = m_copypacket(m, M_DONTWAIT); 2156 if (mc == NULL) { 2157 if_statinc(&sc->sc_if, if_oerrors); 2158 goto next; 2159 } 2160 /* 2161 * Before enqueueing this packet to the destination 2162 * interface, clear any in-bound checksum flags to 2163 * prevent them from being misused as out-bound flags. 2164 */ 2165 mc->m_pkthdr.csum_flags = 0; 2166 2167 m_set_rcvif(mc, dst_if); 2168 mc->m_flags &= ~M_PROMISC; 2169 2170 ACQUIRE_GLOBAL_LOCKS(); 2171 ether_input(dst_if, mc); 2172 RELEASE_GLOBAL_LOCKS(); 2173 } 2174 next: 2175 BRIDGE_PSZ_RENTER(s); 2176 bridge_release_member(sc, bif, &psref); 2177 } 2178 BRIDGE_PSZ_REXIT(s); 2179 2180 m_freem(m); 2181 } 2182 2183 static int 2184 bridge_rtalloc(struct bridge_softc *sc, const uint8_t *dst, 2185 struct bridge_rtnode **brtp) 2186 { 2187 struct bridge_rtnode *brt; 2188 int error; 2189 2190 if (sc->sc_brtcnt >= sc->sc_brtmax) 2191 return ENOSPC; 2192 2193 /* 2194 * Allocate a new bridge forwarding node, and 2195 * initialize the expiration time and Ethernet 2196 * address. 2197 */ 2198 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 2199 if (brt == NULL) 2200 return ENOMEM; 2201 2202 memset(brt, 0, sizeof(*brt)); 2203 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2204 brt->brt_flags = IFBAF_DYNAMIC; 2205 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2206 PSLIST_ENTRY_INIT(brt, brt_list); 2207 PSLIST_ENTRY_INIT(brt, brt_hash); 2208 2209 BRIDGE_RT_LOCK(sc); 2210 error = bridge_rtnode_insert(sc, brt); 2211 BRIDGE_RT_UNLOCK(sc); 2212 2213 if (error != 0) { 2214 pool_put(&bridge_rtnode_pool, brt); 2215 return error; 2216 } 2217 2218 *brtp = brt; 2219 return 0; 2220 } 2221 2222 /* 2223 * bridge_rtupdate: 2224 * 2225 * Add a bridge routing entry. 2226 */ 2227 static int 2228 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 2229 struct ifnet *dst_if, int setflags, uint8_t flags) 2230 { 2231 struct bridge_rtnode *brt; 2232 int s; 2233 2234 again: 2235 /* 2236 * A route for this destination might already exist. If so, 2237 * update it, otherwise create a new one. 2238 */ 2239 BRIDGE_RT_RENTER(s); 2240 brt = bridge_rtnode_lookup(sc, dst); 2241 2242 if (brt != NULL) { 2243 brt->brt_ifp = dst_if; 2244 if (setflags) { 2245 brt->brt_flags = flags; 2246 if (flags & IFBAF_STATIC) 2247 brt->brt_expire = 0; 2248 else 2249 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2250 } else { 2251 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2252 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2253 } 2254 } 2255 BRIDGE_RT_REXIT(s); 2256 2257 if (brt == NULL) { 2258 int r; 2259 2260 r = bridge_rtalloc(sc, dst, &brt); 2261 if (r != 0) 2262 return r; 2263 goto again; 2264 } 2265 2266 return 0; 2267 } 2268 2269 /* 2270 * bridge_rtlookup: 2271 * 2272 * Lookup the destination interface for an address. 2273 */ 2274 static struct ifnet * 2275 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2276 { 2277 struct bridge_rtnode *brt; 2278 struct ifnet *ifs = NULL; 2279 int s; 2280 2281 BRIDGE_RT_RENTER(s); 2282 brt = bridge_rtnode_lookup(sc, addr); 2283 if (brt != NULL) 2284 ifs = brt->brt_ifp; 2285 BRIDGE_RT_REXIT(s); 2286 2287 return ifs; 2288 } 2289 2290 typedef bool (*bridge_iterate_cb_t) 2291 (struct bridge_softc *, struct bridge_rtnode *, bool *, void *); 2292 2293 /* 2294 * bridge_rtlist_iterate_remove: 2295 * 2296 * It iterates on sc->sc_rtlist and removes rtnodes of it which func 2297 * callback judges to remove. Removals of rtnodes are done in a manner 2298 * of pserialize. To this end, all kmem_* operations are placed out of 2299 * mutexes. 2300 */ 2301 static void 2302 bridge_rtlist_iterate_remove(struct bridge_softc *sc, bridge_iterate_cb_t func, void *arg) 2303 { 2304 struct bridge_rtnode *brt; 2305 struct bridge_rtnode **brt_list; 2306 int i, count; 2307 2308 retry: 2309 count = sc->sc_brtcnt; 2310 if (count == 0) 2311 return; 2312 brt_list = kmem_alloc(sizeof(*brt_list) * count, KM_SLEEP); 2313 2314 BRIDGE_RT_LOCK(sc); 2315 if (__predict_false(sc->sc_brtcnt > count)) { 2316 /* The rtnodes increased, we need more memory */ 2317 BRIDGE_RT_UNLOCK(sc); 2318 kmem_free(brt_list, sizeof(*brt_list) * count); 2319 goto retry; 2320 } 2321 2322 i = 0; 2323 /* 2324 * We don't need to use a _SAFE variant here because we know 2325 * that a removed item keeps its next pointer as-is thanks to 2326 * pslist(9) and isn't freed in the loop. 2327 */ 2328 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 2329 bool need_break = false; 2330 if (func(sc, brt, &need_break, arg)) { 2331 bridge_rtnode_remove(sc, brt); 2332 brt_list[i++] = brt; 2333 } 2334 if (need_break) 2335 break; 2336 } 2337 2338 if (i > 0) 2339 BRIDGE_RT_PSZ_PERFORM(sc); 2340 BRIDGE_RT_UNLOCK(sc); 2341 2342 while (--i >= 0) 2343 bridge_rtnode_destroy(brt_list[i]); 2344 2345 kmem_free(brt_list, sizeof(*brt_list) * count); 2346 } 2347 2348 static bool 2349 bridge_rttrim0_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2350 bool *need_break, void *arg) 2351 { 2352 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2353 /* Take into account of the subsequent removal */ 2354 if ((sc->sc_brtcnt - 1) <= sc->sc_brtmax) 2355 *need_break = true; 2356 return true; 2357 } else 2358 return false; 2359 } 2360 2361 static void 2362 bridge_rttrim0(struct bridge_softc *sc) 2363 { 2364 bridge_rtlist_iterate_remove(sc, bridge_rttrim0_cb, NULL); 2365 } 2366 2367 /* 2368 * bridge_rttrim: 2369 * 2370 * Trim the routine table so that we have a number 2371 * of routing entries less than or equal to the 2372 * maximum number. 2373 */ 2374 static void 2375 bridge_rttrim(struct bridge_softc *sc) 2376 { 2377 2378 /* Make sure we actually need to do this. */ 2379 if (sc->sc_brtcnt <= sc->sc_brtmax) 2380 return; 2381 2382 /* Force an aging cycle; this might trim enough addresses. */ 2383 bridge_rtage(sc); 2384 if (sc->sc_brtcnt <= sc->sc_brtmax) 2385 return; 2386 2387 bridge_rttrim0(sc); 2388 2389 return; 2390 } 2391 2392 /* 2393 * bridge_timer: 2394 * 2395 * Aging timer for the bridge. 2396 */ 2397 static void 2398 bridge_timer(void *arg) 2399 { 2400 struct bridge_softc *sc = arg; 2401 2402 workqueue_enqueue(sc->sc_rtage_wq, &sc->sc_rtage_wk, NULL); 2403 } 2404 2405 static void 2406 bridge_rtage_work(struct work *wk, void *arg) 2407 { 2408 struct bridge_softc *sc = arg; 2409 2410 KASSERT(wk == &sc->sc_rtage_wk); 2411 2412 bridge_rtage(sc); 2413 2414 if (sc->sc_if.if_flags & IFF_RUNNING) 2415 callout_reset(&sc->sc_brcallout, 2416 bridge_rtable_prune_period * hz, bridge_timer, sc); 2417 } 2418 2419 static bool 2420 bridge_rtage_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2421 bool *need_break, void *arg) 2422 { 2423 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2424 time_uptime >= brt->brt_expire) 2425 return true; 2426 else 2427 return false; 2428 } 2429 2430 /* 2431 * bridge_rtage: 2432 * 2433 * Perform an aging cycle. 2434 */ 2435 static void 2436 bridge_rtage(struct bridge_softc *sc) 2437 { 2438 bridge_rtlist_iterate_remove(sc, bridge_rtage_cb, NULL); 2439 } 2440 2441 2442 static bool 2443 bridge_rtflush_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2444 bool *need_break, void *arg) 2445 { 2446 int full = *(int*)arg; 2447 2448 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2449 return true; 2450 else 2451 return false; 2452 } 2453 2454 /* 2455 * bridge_rtflush: 2456 * 2457 * Remove all dynamic addresses from the bridge. 2458 */ 2459 static void 2460 bridge_rtflush(struct bridge_softc *sc, int full) 2461 { 2462 bridge_rtlist_iterate_remove(sc, bridge_rtflush_cb, &full); 2463 } 2464 2465 /* 2466 * bridge_rtdaddr: 2467 * 2468 * Remove an address from the table. 2469 */ 2470 static int 2471 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2472 { 2473 struct bridge_rtnode *brt; 2474 2475 BRIDGE_RT_LOCK(sc); 2476 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2477 BRIDGE_RT_UNLOCK(sc); 2478 return ENOENT; 2479 } 2480 bridge_rtnode_remove(sc, brt); 2481 BRIDGE_RT_PSZ_PERFORM(sc); 2482 BRIDGE_RT_UNLOCK(sc); 2483 2484 bridge_rtnode_destroy(brt); 2485 2486 return 0; 2487 } 2488 2489 /* 2490 * bridge_rtdelete: 2491 * 2492 * Delete routes to a speicifc member interface. 2493 */ 2494 static void 2495 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2496 { 2497 struct bridge_rtnode *brt; 2498 2499 /* XXX pserialize_perform for each entry is slow */ 2500 again: 2501 BRIDGE_RT_LOCK(sc); 2502 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 2503 if (brt->brt_ifp == ifp) 2504 break; 2505 } 2506 if (brt == NULL) { 2507 BRIDGE_RT_UNLOCK(sc); 2508 return; 2509 } 2510 bridge_rtnode_remove(sc, brt); 2511 BRIDGE_RT_PSZ_PERFORM(sc); 2512 BRIDGE_RT_UNLOCK(sc); 2513 2514 bridge_rtnode_destroy(brt); 2515 2516 goto again; 2517 } 2518 2519 /* 2520 * bridge_rtable_init: 2521 * 2522 * Initialize the route table for this bridge. 2523 */ 2524 static void 2525 bridge_rtable_init(struct bridge_softc *sc) 2526 { 2527 int i; 2528 2529 sc->sc_rthash = kmem_alloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2530 KM_SLEEP); 2531 2532 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2533 PSLIST_INIT(&sc->sc_rthash[i]); 2534 2535 sc->sc_rthash_key = cprng_fast32(); 2536 2537 PSLIST_INIT(&sc->sc_rtlist); 2538 2539 sc->sc_rtlist_psz = pserialize_create(); 2540 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 2541 } 2542 2543 /* 2544 * bridge_rtable_fini: 2545 * 2546 * Deconstruct the route table for this bridge. 2547 */ 2548 static void 2549 bridge_rtable_fini(struct bridge_softc *sc) 2550 { 2551 2552 kmem_free(sc->sc_rthash, sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE); 2553 mutex_obj_free(sc->sc_rtlist_lock); 2554 pserialize_destroy(sc->sc_rtlist_psz); 2555 } 2556 2557 /* 2558 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2559 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2560 */ 2561 #define mix(a, b, c) \ 2562 do { \ 2563 a -= b; a -= c; a ^= (c >> 13); \ 2564 b -= c; b -= a; b ^= (a << 8); \ 2565 c -= a; c -= b; c ^= (b >> 13); \ 2566 a -= b; a -= c; a ^= (c >> 12); \ 2567 b -= c; b -= a; b ^= (a << 16); \ 2568 c -= a; c -= b; c ^= (b >> 5); \ 2569 a -= b; a -= c; a ^= (c >> 3); \ 2570 b -= c; b -= a; b ^= (a << 10); \ 2571 c -= a; c -= b; c ^= (b >> 15); \ 2572 } while (/*CONSTCOND*/0) 2573 2574 static inline uint32_t 2575 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2576 { 2577 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2578 2579 b += addr[5] << 8; 2580 b += addr[4]; 2581 a += (uint32_t)addr[3] << 24; 2582 a += addr[2] << 16; 2583 a += addr[1] << 8; 2584 a += addr[0]; 2585 2586 mix(a, b, c); 2587 2588 return (c & BRIDGE_RTHASH_MASK); 2589 } 2590 2591 #undef mix 2592 2593 /* 2594 * bridge_rtnode_lookup: 2595 * 2596 * Look up a bridge route node for the specified destination. 2597 */ 2598 static struct bridge_rtnode * 2599 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2600 { 2601 struct bridge_rtnode *brt; 2602 uint32_t hash; 2603 int dir; 2604 2605 hash = bridge_rthash(sc, addr); 2606 BRIDGE_RTHASH_READER_FOREACH(brt, sc, hash) { 2607 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2608 if (dir == 0) 2609 return brt; 2610 if (dir > 0) 2611 return NULL; 2612 } 2613 2614 return NULL; 2615 } 2616 2617 /* 2618 * bridge_rtnode_insert: 2619 * 2620 * Insert the specified bridge node into the route table. We 2621 * assume the entry is not already in the table. 2622 */ 2623 static int 2624 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2625 { 2626 struct bridge_rtnode *lbrt, *prev = NULL; 2627 uint32_t hash; 2628 2629 KASSERT(BRIDGE_RT_LOCKED(sc)); 2630 2631 hash = bridge_rthash(sc, brt->brt_addr); 2632 BRIDGE_RTHASH_WRITER_FOREACH(lbrt, sc, hash) { 2633 int dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2634 if (dir == 0) 2635 return EEXIST; 2636 if (dir > 0) 2637 break; 2638 prev = lbrt; 2639 } 2640 if (prev == NULL) 2641 BRIDGE_RTHASH_WRITER_INSERT_HEAD(sc, hash, brt); 2642 else 2643 BRIDGE_RTHASH_WRITER_INSERT_AFTER(prev, brt); 2644 2645 BRIDGE_RTLIST_WRITER_INSERT_HEAD(sc, brt); 2646 sc->sc_brtcnt++; 2647 2648 return 0; 2649 } 2650 2651 /* 2652 * bridge_rtnode_remove: 2653 * 2654 * Remove a bridge rtnode from the rthash and the rtlist of a bridge. 2655 */ 2656 static void 2657 bridge_rtnode_remove(struct bridge_softc *sc, struct bridge_rtnode *brt) 2658 { 2659 2660 KASSERT(BRIDGE_RT_LOCKED(sc)); 2661 2662 BRIDGE_RTHASH_WRITER_REMOVE(brt); 2663 BRIDGE_RTLIST_WRITER_REMOVE(brt); 2664 sc->sc_brtcnt--; 2665 } 2666 2667 /* 2668 * bridge_rtnode_destroy: 2669 * 2670 * Destroy a bridge rtnode. 2671 */ 2672 static void 2673 bridge_rtnode_destroy(struct bridge_rtnode *brt) 2674 { 2675 2676 PSLIST_ENTRY_DESTROY(brt, brt_list); 2677 PSLIST_ENTRY_DESTROY(brt, brt_hash); 2678 pool_put(&bridge_rtnode_pool, brt); 2679 } 2680 2681 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2682 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2683 2684 /* 2685 * Send bridge packets through IPF if they are one of the types IPF can deal 2686 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2687 * question.) 2688 */ 2689 static int 2690 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2691 { 2692 int snap, error; 2693 struct ether_header *eh1, eh2; 2694 struct llc llc1; 2695 uint16_t ether_type; 2696 2697 snap = 0; 2698 error = -1; /* Default error if not error == 0 */ 2699 eh1 = mtod(*mp, struct ether_header *); 2700 ether_type = ntohs(eh1->ether_type); 2701 2702 /* 2703 * Check for SNAP/LLC. 2704 */ 2705 if (ether_type < ETHERMTU) { 2706 struct llc *llc2 = (struct llc *)(eh1 + 1); 2707 2708 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2709 llc2->llc_dsap == LLC_SNAP_LSAP && 2710 llc2->llc_ssap == LLC_SNAP_LSAP && 2711 llc2->llc_control == LLC_UI) { 2712 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2713 snap = 1; 2714 } 2715 } 2716 2717 /* drop VLAN traffic untagged by hardware offloading */ 2718 if (vlan_has_tag(*mp)) 2719 goto bad; 2720 2721 /* 2722 * If we're trying to filter bridge traffic, don't look at anything 2723 * other than IP and ARP traffic. If the filter doesn't understand 2724 * IPv6, don't allow IPv6 through the bridge either. This is lame 2725 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2726 * but of course we don't have an AppleTalk filter to begin with. 2727 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2728 * ARP traffic.) 2729 */ 2730 switch (ether_type) { 2731 case ETHERTYPE_ARP: 2732 case ETHERTYPE_REVARP: 2733 return 0; /* Automatically pass */ 2734 case ETHERTYPE_IP: 2735 # ifdef INET6 2736 case ETHERTYPE_IPV6: 2737 # endif /* INET6 */ 2738 break; 2739 default: 2740 goto bad; 2741 } 2742 2743 /* Strip off the Ethernet header and keep a copy. */ 2744 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2745 m_adj(*mp, ETHER_HDR_LEN); 2746 2747 /* Strip off snap header, if present */ 2748 if (snap) { 2749 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2750 m_adj(*mp, sizeof(struct llc)); 2751 } 2752 2753 /* 2754 * Check basic packet sanity and run IPF through pfil. 2755 */ 2756 KASSERT(!cpu_intr_p()); 2757 switch (ether_type) 2758 { 2759 case ETHERTYPE_IP : 2760 error = bridge_ip_checkbasic(mp); 2761 if (error == 0) 2762 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2763 break; 2764 # ifdef INET6 2765 case ETHERTYPE_IPV6 : 2766 error = bridge_ip6_checkbasic(mp); 2767 if (error == 0) 2768 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2769 break; 2770 # endif 2771 default : 2772 error = 0; 2773 break; 2774 } 2775 2776 if (*mp == NULL) 2777 return error; 2778 if (error != 0) 2779 goto bad; 2780 2781 error = -1; 2782 2783 /* 2784 * Finally, put everything back the way it was and return 2785 */ 2786 if (snap) { 2787 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2788 if (*mp == NULL) 2789 return error; 2790 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2791 } 2792 2793 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2794 if (*mp == NULL) 2795 return error; 2796 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2797 2798 return 0; 2799 2800 bad: 2801 m_freem(*mp); 2802 *mp = NULL; 2803 return error; 2804 } 2805 2806 /* 2807 * Perform basic checks on header size since 2808 * IPF assumes ip_input has already processed 2809 * it for it. Cut-and-pasted from ip_input.c. 2810 * Given how simple the IPv6 version is, 2811 * does the IPv4 version really need to be 2812 * this complicated? 2813 * 2814 * XXX Should we update ipstat here, or not? 2815 * XXX Right now we update ipstat but not 2816 * XXX csum_counter. 2817 */ 2818 static int 2819 bridge_ip_checkbasic(struct mbuf **mp) 2820 { 2821 struct mbuf *m = *mp; 2822 struct ip *ip; 2823 int len, hlen; 2824 2825 if (*mp == NULL) 2826 return -1; 2827 2828 if (M_GET_ALIGNED_HDR(&m, struct ip, true) != 0) { 2829 /* XXXJRT new stat, please */ 2830 ip_statinc(IP_STAT_TOOSMALL); 2831 goto bad; 2832 } 2833 ip = mtod(m, struct ip *); 2834 if (ip == NULL) goto bad; 2835 2836 if (ip->ip_v != IPVERSION) { 2837 ip_statinc(IP_STAT_BADVERS); 2838 goto bad; 2839 } 2840 hlen = ip->ip_hl << 2; 2841 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2842 ip_statinc(IP_STAT_BADHLEN); 2843 goto bad; 2844 } 2845 if (hlen > m->m_len) { 2846 if ((m = m_pullup(m, hlen)) == 0) { 2847 ip_statinc(IP_STAT_BADHLEN); 2848 goto bad; 2849 } 2850 ip = mtod(m, struct ip *); 2851 if (ip == NULL) goto bad; 2852 } 2853 2854 switch (m->m_pkthdr.csum_flags & 2855 ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_IPv4) | 2856 M_CSUM_IPv4_BAD)) { 2857 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2858 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2859 goto bad; 2860 2861 case M_CSUM_IPv4: 2862 /* Checksum was okay. */ 2863 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2864 break; 2865 2866 default: 2867 /* Must compute it ourselves. */ 2868 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2869 if (in_cksum(m, hlen) != 0) 2870 goto bad; 2871 break; 2872 } 2873 2874 /* Retrieve the packet length. */ 2875 len = ntohs(ip->ip_len); 2876 2877 /* 2878 * Check for additional length bogosity 2879 */ 2880 if (len < hlen) { 2881 ip_statinc(IP_STAT_BADLEN); 2882 goto bad; 2883 } 2884 2885 /* 2886 * Check that the amount of data in the buffers 2887 * is as at least much as the IP header would have us expect. 2888 * Drop packet if shorter than we expect. 2889 */ 2890 if (m->m_pkthdr.len < len) { 2891 ip_statinc(IP_STAT_TOOSHORT); 2892 goto bad; 2893 } 2894 2895 /* Checks out, proceed */ 2896 *mp = m; 2897 return 0; 2898 2899 bad: 2900 *mp = m; 2901 return -1; 2902 } 2903 2904 # ifdef INET6 2905 /* 2906 * Same as above, but for IPv6. 2907 * Cut-and-pasted from ip6_input.c. 2908 * XXX Should we update ip6stat, or not? 2909 */ 2910 static int 2911 bridge_ip6_checkbasic(struct mbuf **mp) 2912 { 2913 struct mbuf *m = *mp; 2914 struct ip6_hdr *ip6; 2915 2916 /* 2917 * If the IPv6 header is not aligned, slurp it up into a new 2918 * mbuf with space for link headers, in the event we forward 2919 * it. Otherwise, if it is aligned, make sure the entire base 2920 * IPv6 header is in the first mbuf of the chain. 2921 */ 2922 if (M_GET_ALIGNED_HDR(&m, struct ip6_hdr, true) != 0) { 2923 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2924 /* XXXJRT new stat, please */ 2925 ip6_statinc(IP6_STAT_TOOSMALL); 2926 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2927 goto bad; 2928 } 2929 2930 ip6 = mtod(m, struct ip6_hdr *); 2931 2932 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2933 ip6_statinc(IP6_STAT_BADVERS); 2934 in6_ifstat_inc(m_get_rcvif_NOMPSAFE(m), ifs6_in_hdrerr); 2935 goto bad; 2936 } 2937 2938 /* Checks out, proceed */ 2939 *mp = m; 2940 return 0; 2941 2942 bad: 2943 *mp = m; 2944 return -1; 2945 } 2946 # endif /* INET6 */ 2947
Indexes created Tue Sep 23 02:09:52 GMT 2025