if_bridge.c revision 1.165
1 /* $NetBSD: if_bridge.c,v 1.165 2019/08/05 13:30:21 msaitoh 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 1.165 2019/08/05 13:30:21 msaitoh Exp $"); 84 85 #ifdef _KERNEL_OPT 86 #include "opt_bridge_ipf.h" 87 #include "opt_inet.h" 88 #include "opt_net_mpsafe.h" 89 #endif /* _KERNEL_OPT */ 90 91 #include <sys/param.h> 92 #include <sys/kernel.h> 93 #include <sys/mbuf.h> 94 #include <sys/queue.h> 95 #include <sys/socket.h> 96 #include <sys/socketvar.h> /* for softnet_lock */ 97 #include <sys/sockio.h> 98 #include <sys/systm.h> 99 #include <sys/proc.h> 100 #include <sys/pool.h> 101 #include <sys/kauth.h> 102 #include <sys/cpu.h> 103 #include <sys/cprng.h> 104 #include <sys/mutex.h> 105 #include <sys/kmem.h> 106 107 #include <net/bpf.h> 108 #include <net/if.h> 109 #include <net/if_dl.h> 110 #include <net/if_types.h> 111 #include <net/if_llc.h> 112 113 #include <net/if_ether.h> 114 #include <net/if_bridgevar.h> 115 #include <net/ether_sw_offload.h> 116 117 #if defined(BRIDGE_IPF) 118 /* Used for bridge_ip[6]_checkbasic */ 119 #include <netinet/in.h> 120 #include <netinet/in_systm.h> 121 #include <netinet/ip.h> 122 #include <netinet/ip_var.h> 123 #include <netinet/ip_private.h> /* XXX */ 124 125 #include <netinet/ip6.h> 126 #include <netinet6/in6_var.h> 127 #include <netinet6/ip6_var.h> 128 #include <netinet6/ip6_private.h> /* XXX */ 129 #endif /* BRIDGE_IPF */ 130 131 /* 132 * Size of the route hash table. Must be a power of two. 133 */ 134 #ifndef BRIDGE_RTHASH_SIZE 135 #define BRIDGE_RTHASH_SIZE 1024 136 #endif 137 138 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 139 140 #include "carp.h" 141 #if NCARP > 0 142 #include <netinet/in.h> 143 #include <netinet/in_var.h> 144 #include <netinet/ip_carp.h> 145 #endif 146 147 #include "ioconf.h" 148 149 __CTASSERT(sizeof(struct ifbifconf) == sizeof(struct ifbaconf)); 150 __CTASSERT(offsetof(struct ifbifconf, ifbic_len) == offsetof(struct ifbaconf, ifbac_len)); 151 __CTASSERT(offsetof(struct ifbifconf, ifbic_buf) == offsetof(struct ifbaconf, ifbac_buf)); 152 153 /* 154 * Maximum number of addresses to cache. 155 */ 156 #ifndef BRIDGE_RTABLE_MAX 157 #define BRIDGE_RTABLE_MAX 100 158 #endif 159 160 /* 161 * Spanning tree defaults. 162 */ 163 #define BSTP_DEFAULT_MAX_AGE (20 * 256) 164 #define BSTP_DEFAULT_HELLO_TIME (2 * 256) 165 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) 166 #define BSTP_DEFAULT_HOLD_TIME (1 * 256) 167 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 168 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 169 #define BSTP_DEFAULT_PATH_COST 55 170 171 /* 172 * Timeout (in seconds) for entries learned dynamically. 173 */ 174 #ifndef BRIDGE_RTABLE_TIMEOUT 175 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 176 #endif 177 178 /* 179 * Number of seconds between walks of the route list. 180 */ 181 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 182 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 183 #endif 184 185 #define BRIDGE_RT_LOCK(_sc) mutex_enter((_sc)->sc_rtlist_lock) 186 #define BRIDGE_RT_UNLOCK(_sc) mutex_exit((_sc)->sc_rtlist_lock) 187 #define BRIDGE_RT_LOCKED(_sc) mutex_owned((_sc)->sc_rtlist_lock) 188 189 #define BRIDGE_RT_PSZ_PERFORM(_sc) \ 190 pserialize_perform((_sc)->sc_rtlist_psz) 191 192 #define BRIDGE_RT_RENTER(__s) do { __s = pserialize_read_enter(); } while (0) 193 #define BRIDGE_RT_REXIT(__s) do { pserialize_read_exit(__s); } while (0) 194 195 #define BRIDGE_RTLIST_READER_FOREACH(_brt, _sc) \ 196 PSLIST_READER_FOREACH((_brt), &((_sc)->sc_rtlist), \ 197 struct bridge_rtnode, brt_list) 198 #define BRIDGE_RTLIST_WRITER_FOREACH(_brt, _sc) \ 199 PSLIST_WRITER_FOREACH((_brt), &((_sc)->sc_rtlist), \ 200 struct bridge_rtnode, brt_list) 201 #define BRIDGE_RTLIST_WRITER_INSERT_HEAD(_sc, _brt) \ 202 PSLIST_WRITER_INSERT_HEAD(&(_sc)->sc_rtlist, brt, brt_list) 203 #define BRIDGE_RTLIST_WRITER_REMOVE(_brt) \ 204 PSLIST_WRITER_REMOVE((_brt), brt_list) 205 206 #define BRIDGE_RTHASH_READER_FOREACH(_brt, _sc, _hash) \ 207 PSLIST_READER_FOREACH((_brt), &(_sc)->sc_rthash[(_hash)], \ 208 struct bridge_rtnode, brt_hash) 209 #define BRIDGE_RTHASH_WRITER_FOREACH(_brt, _sc, _hash) \ 210 PSLIST_WRITER_FOREACH((_brt), &(_sc)->sc_rthash[(_hash)], \ 211 struct bridge_rtnode, brt_hash) 212 #define BRIDGE_RTHASH_WRITER_INSERT_HEAD(_sc, _hash, _brt) \ 213 PSLIST_WRITER_INSERT_HEAD(&(_sc)->sc_rthash[(_hash)], brt, brt_hash) 214 #define BRIDGE_RTHASH_WRITER_INSERT_AFTER(_brt, _new) \ 215 PSLIST_WRITER_INSERT_AFTER((_brt), (_new), brt_hash) 216 #define BRIDGE_RTHASH_WRITER_REMOVE(_brt) \ 217 PSLIST_WRITER_REMOVE((_brt), brt_hash) 218 219 #ifdef NET_MPSAFE 220 #define DECLARE_LOCK_VARIABLE 221 #define ACQUIRE_GLOBAL_LOCKS() do { } while (0) 222 #define RELEASE_GLOBAL_LOCKS() do { } while (0) 223 #else 224 #define DECLARE_LOCK_VARIABLE int __s 225 #define ACQUIRE_GLOBAL_LOCKS() do { \ 226 KERNEL_LOCK(1, NULL); \ 227 mutex_enter(softnet_lock); \ 228 __s = splsoftnet(); \ 229 } while (0) 230 #define RELEASE_GLOBAL_LOCKS() do { \ 231 splx(__s); \ 232 mutex_exit(softnet_lock); \ 233 KERNEL_UNLOCK_ONE(NULL); \ 234 } while (0) 235 #endif 236 237 struct psref_class *bridge_psref_class __read_mostly; 238 239 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 240 241 static struct pool bridge_rtnode_pool; 242 243 static int bridge_clone_create(struct if_clone *, int); 244 static int bridge_clone_destroy(struct ifnet *); 245 246 static int bridge_ioctl(struct ifnet *, u_long, void *); 247 static int bridge_init(struct ifnet *); 248 static void bridge_stop(struct ifnet *, int); 249 static void bridge_start(struct ifnet *); 250 251 static void bridge_input(struct ifnet *, struct mbuf *); 252 static void bridge_forward(struct bridge_softc *, struct mbuf *); 253 254 static void bridge_timer(void *); 255 256 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 257 struct mbuf *); 258 259 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 260 struct ifnet *, int, uint8_t); 261 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 262 static void bridge_rttrim(struct bridge_softc *); 263 static void bridge_rtage(struct bridge_softc *); 264 static void bridge_rtage_work(struct work *, void *); 265 static void bridge_rtflush(struct bridge_softc *, int); 266 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 267 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp); 268 269 static void bridge_rtable_init(struct bridge_softc *); 270 static void bridge_rtable_fini(struct bridge_softc *); 271 272 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 273 const uint8_t *); 274 static int bridge_rtnode_insert(struct bridge_softc *, 275 struct bridge_rtnode *); 276 static void bridge_rtnode_remove(struct bridge_softc *, 277 struct bridge_rtnode *); 278 static void bridge_rtnode_destroy(struct bridge_rtnode *); 279 280 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 281 const char *name, 282 struct psref *); 283 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 284 struct ifnet *ifp, 285 struct psref *); 286 static void bridge_release_member(struct bridge_softc *, struct bridge_iflist *, 287 struct psref *); 288 static void bridge_delete_member(struct bridge_softc *, 289 struct bridge_iflist *); 290 static void bridge_acquire_member(struct bridge_softc *sc, 291 struct bridge_iflist *, 292 struct psref *); 293 294 static int bridge_ioctl_add(struct bridge_softc *, void *); 295 static int bridge_ioctl_del(struct bridge_softc *, void *); 296 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 297 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 298 static int bridge_ioctl_scache(struct bridge_softc *, void *); 299 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 300 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 301 static int bridge_ioctl_rts(struct bridge_softc *, void *); 302 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 303 static int bridge_ioctl_sto(struct bridge_softc *, void *); 304 static int bridge_ioctl_gto(struct bridge_softc *, void *); 305 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 306 static int bridge_ioctl_flush(struct bridge_softc *, void *); 307 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 308 static int bridge_ioctl_spri(struct bridge_softc *, void *); 309 static int bridge_ioctl_ght(struct bridge_softc *, void *); 310 static int bridge_ioctl_sht(struct bridge_softc *, void *); 311 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 312 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 313 static int bridge_ioctl_gma(struct bridge_softc *, void *); 314 static int bridge_ioctl_sma(struct bridge_softc *, void *); 315 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 316 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 317 #if defined(BRIDGE_IPF) 318 static int bridge_ioctl_gfilt(struct bridge_softc *, void *); 319 static int bridge_ioctl_sfilt(struct bridge_softc *, void *); 320 static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int); 321 static int bridge_ip_checkbasic(struct mbuf **mp); 322 # ifdef INET6 323 static int bridge_ip6_checkbasic(struct mbuf **mp); 324 # endif /* INET6 */ 325 #endif /* BRIDGE_IPF */ 326 327 struct bridge_control { 328 int (*bc_func)(struct bridge_softc *, void *); 329 int bc_argsize; 330 int bc_flags; 331 }; 332 333 #define BC_F_COPYIN 0x01 /* copy arguments in */ 334 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 335 #define BC_F_SUSER 0x04 /* do super-user check */ 336 #define BC_F_XLATEIN 0x08 /* xlate arguments in */ 337 #define BC_F_XLATEOUT 0x10 /* xlate arguments out */ 338 339 static const struct bridge_control bridge_control_table[] = { 340 [BRDGADD] = {bridge_ioctl_add, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 341 [BRDGDEL] = {bridge_ioctl_del, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 342 343 [BRDGGIFFLGS] = {bridge_ioctl_gifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_COPYOUT}, 344 [BRDGSIFFLGS] = {bridge_ioctl_sifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 345 346 [BRDGSCACHE] = {bridge_ioctl_scache, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 347 [BRDGGCACHE] = {bridge_ioctl_gcache, sizeof(struct ifbrparam), BC_F_COPYOUT}, 348 349 [OBRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_COPYIN|BC_F_COPYOUT}, 350 [OBRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_COPYIN|BC_F_COPYOUT}, 351 352 [BRDGSADDR] = {bridge_ioctl_saddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 353 354 [BRDGSTO] = {bridge_ioctl_sto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 355 [BRDGGTO] = {bridge_ioctl_gto, sizeof(struct ifbrparam), BC_F_COPYOUT}, 356 357 [BRDGDADDR] = {bridge_ioctl_daddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 358 359 [BRDGFLUSH] = {bridge_ioctl_flush, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 360 361 [BRDGGPRI] = {bridge_ioctl_gpri, sizeof(struct ifbrparam), BC_F_COPYOUT}, 362 [BRDGSPRI] = {bridge_ioctl_spri, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 363 364 [BRDGGHT] = {bridge_ioctl_ght, sizeof(struct ifbrparam), BC_F_COPYOUT}, 365 [BRDGSHT] = {bridge_ioctl_sht, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 366 367 [BRDGGFD] = {bridge_ioctl_gfd, sizeof(struct ifbrparam), BC_F_COPYOUT}, 368 [BRDGSFD] = {bridge_ioctl_sfd, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 369 370 [BRDGGMA] = {bridge_ioctl_gma, sizeof(struct ifbrparam), BC_F_COPYOUT}, 371 [BRDGSMA] = {bridge_ioctl_sma, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 372 373 [BRDGSIFPRIO] = {bridge_ioctl_sifprio, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 374 375 [BRDGSIFCOST] = {bridge_ioctl_sifcost, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 376 #if defined(BRIDGE_IPF) 377 [BRDGGFILT] = {bridge_ioctl_gfilt, sizeof(struct ifbrparam), BC_F_COPYOUT}, 378 [BRDGSFILT] = {bridge_ioctl_sfilt, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 379 #endif /* BRIDGE_IPF */ 380 [BRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 381 [BRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 382 }; 383 384 static const int bridge_control_table_size = __arraycount(bridge_control_table); 385 386 static struct if_clone bridge_cloner = 387 IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy); 388 389 /* 390 * bridgeattach: 391 * 392 * Pseudo-device attach routine. 393 */ 394 void 395 bridgeattach(int n) 396 { 397 398 pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode), 399 0, 0, 0, "brtpl", NULL, IPL_NET); 400 401 bridge_psref_class = psref_class_create("bridge", IPL_SOFTNET); 402 403 if_clone_attach(&bridge_cloner); 404 } 405 406 /* 407 * bridge_clone_create: 408 * 409 * Create a new bridge instance. 410 */ 411 static int 412 bridge_clone_create(struct if_clone *ifc, int unit) 413 { 414 struct bridge_softc *sc; 415 struct ifnet *ifp; 416 int error; 417 418 sc = kmem_zalloc(sizeof(*sc), KM_SLEEP); 419 ifp = &sc->sc_if; 420 421 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 422 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 423 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 424 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 425 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 426 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 427 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 428 sc->sc_filter_flags = 0; 429 430 /* Initialize our routing table. */ 431 bridge_rtable_init(sc); 432 433 error = workqueue_create(&sc->sc_rtage_wq, "bridge_rtage", 434 bridge_rtage_work, sc, PRI_SOFTNET, IPL_SOFTNET, WQ_MPSAFE); 435 if (error) 436 panic("%s: workqueue_create %d\n", __func__, error); 437 438 callout_init(&sc->sc_brcallout, CALLOUT_MPSAFE); 439 callout_init(&sc->sc_bstpcallout, CALLOUT_MPSAFE); 440 441 mutex_init(&sc->sc_iflist_psref.bip_lock, MUTEX_DEFAULT, IPL_NONE); 442 PSLIST_INIT(&sc->sc_iflist_psref.bip_iflist); 443 sc->sc_iflist_psref.bip_psz = pserialize_create(); 444 445 if_initname(ifp, ifc->ifc_name, unit); 446 ifp->if_softc = sc; 447 ifp->if_extflags = IFEF_NO_LINK_STATE_CHANGE; 448 #ifdef NET_MPSAFE 449 ifp->if_extflags |= IFEF_MPSAFE; 450 #endif 451 ifp->if_mtu = ETHERMTU; 452 ifp->if_ioctl = bridge_ioctl; 453 ifp->if_output = bridge_output; 454 ifp->if_start = bridge_start; 455 ifp->if_stop = bridge_stop; 456 ifp->if_init = bridge_init; 457 ifp->if_type = IFT_BRIDGE; 458 ifp->if_addrlen = 0; 459 ifp->if_dlt = DLT_EN10MB; 460 ifp->if_hdrlen = ETHER_HDR_LEN; 461 462 error = if_initialize(ifp); 463 if (error != 0) { 464 pserialize_destroy(sc->sc_iflist_psref.bip_psz); 465 mutex_destroy(&sc->sc_iflist_psref.bip_lock); 466 callout_destroy(&sc->sc_brcallout); 467 callout_destroy(&sc->sc_bstpcallout); 468 workqueue_destroy(sc->sc_rtage_wq); 469 bridge_rtable_fini(sc); 470 kmem_free(sc, sizeof(*sc)); 471 472 return error; 473 } 474 if_alloc_sadl(ifp); 475 if_register(ifp); 476 477 return 0; 478 } 479 480 /* 481 * bridge_clone_destroy: 482 * 483 * Destroy a bridge instance. 484 */ 485 static int 486 bridge_clone_destroy(struct ifnet *ifp) 487 { 488 struct bridge_softc *sc = ifp->if_softc; 489 struct bridge_iflist *bif; 490 491 if ((ifp->if_flags & IFF_RUNNING) != 0) 492 bridge_stop(ifp, 1); 493 494 BRIDGE_LOCK(sc); 495 for (;;) { 496 bif = PSLIST_WRITER_FIRST(&sc->sc_iflist_psref.bip_iflist, struct bridge_iflist, 497 bif_next); 498 if (bif == NULL) 499 break; 500 bridge_delete_member(sc, bif); 501 } 502 PSLIST_DESTROY(&sc->sc_iflist_psref.bip_iflist); 503 BRIDGE_UNLOCK(sc); 504 505 if_detach(ifp); 506 507 /* Tear down the routing table. */ 508 bridge_rtable_fini(sc); 509 510 pserialize_destroy(sc->sc_iflist_psref.bip_psz); 511 mutex_destroy(&sc->sc_iflist_psref.bip_lock); 512 callout_destroy(&sc->sc_brcallout); 513 callout_destroy(&sc->sc_bstpcallout); 514 workqueue_destroy(sc->sc_rtage_wq); 515 kmem_free(sc, sizeof(*sc)); 516 517 return 0; 518 } 519 520 /* 521 * bridge_ioctl: 522 * 523 * Handle a control request from the operator. 524 */ 525 static int 526 bridge_ioctl(struct ifnet *ifp, u_long cmd, void *data) 527 { 528 struct bridge_softc *sc = ifp->if_softc; 529 struct lwp *l = curlwp; /* XXX */ 530 union { 531 struct ifbreq ifbreq; 532 struct ifbifconf ifbifconf; 533 struct ifbareq ifbareq; 534 struct ifbaconf ifbaconf; 535 struct ifbrparam ifbrparam; 536 } args; 537 struct ifdrv *ifd = (struct ifdrv *) data; 538 const struct bridge_control *bc = NULL; /* XXXGCC */ 539 int s, error = 0; 540 541 /* Authorize command before calling splsoftnet(). */ 542 switch (cmd) { 543 case SIOCGDRVSPEC: 544 case SIOCSDRVSPEC: 545 if (ifd->ifd_cmd >= bridge_control_table_size 546 || (bc = &bridge_control_table[ifd->ifd_cmd]) == NULL) { 547 error = EINVAL; 548 return error; 549 } 550 551 /* We only care about BC_F_SUSER at this point. */ 552 if ((bc->bc_flags & BC_F_SUSER) == 0) 553 break; 554 555 error = kauth_authorize_network(l->l_cred, 556 KAUTH_NETWORK_INTERFACE_BRIDGE, 557 cmd == SIOCGDRVSPEC ? 558 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_GETPRIV : 559 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_SETPRIV, 560 ifd, NULL, NULL); 561 if (error) 562 return error; 563 564 break; 565 } 566 567 s = splsoftnet(); 568 569 switch (cmd) { 570 case SIOCGDRVSPEC: 571 case SIOCSDRVSPEC: 572 KASSERT(bc != NULL); 573 if (cmd == SIOCGDRVSPEC && 574 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) == 0) { 575 error = EINVAL; 576 break; 577 } 578 else if (cmd == SIOCSDRVSPEC && 579 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) != 0) { 580 error = EINVAL; 581 break; 582 } 583 584 /* BC_F_SUSER is checked above, before splsoftnet(). */ 585 586 if ((bc->bc_flags & (BC_F_XLATEIN|BC_F_XLATEOUT)) == 0 587 && (ifd->ifd_len != bc->bc_argsize 588 || ifd->ifd_len > sizeof(args))) { 589 error = EINVAL; 590 break; 591 } 592 593 memset(&args, 0, sizeof(args)); 594 if (bc->bc_flags & BC_F_COPYIN) { 595 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 596 if (error) 597 break; 598 } else if (bc->bc_flags & BC_F_XLATEIN) { 599 args.ifbifconf.ifbic_len = ifd->ifd_len; 600 args.ifbifconf.ifbic_buf = ifd->ifd_data; 601 } 602 603 error = (*bc->bc_func)(sc, &args); 604 if (error) 605 break; 606 607 if (bc->bc_flags & BC_F_COPYOUT) { 608 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 609 } else if (bc->bc_flags & BC_F_XLATEOUT) { 610 ifd->ifd_len = args.ifbifconf.ifbic_len; 611 ifd->ifd_data = args.ifbifconf.ifbic_buf; 612 } 613 break; 614 615 case SIOCSIFFLAGS: 616 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 617 break; 618 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 619 case IFF_RUNNING: 620 /* 621 * If interface is marked down and it is running, 622 * then stop and disable it. 623 */ 624 (*ifp->if_stop)(ifp, 1); 625 break; 626 case IFF_UP: 627 /* 628 * If interface is marked up and it is stopped, then 629 * start it. 630 */ 631 error = (*ifp->if_init)(ifp); 632 break; 633 default: 634 break; 635 } 636 break; 637 638 case SIOCSIFMTU: 639 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 640 error = 0; 641 break; 642 643 default: 644 error = ifioctl_common(ifp, cmd, data); 645 break; 646 } 647 648 splx(s); 649 650 return error; 651 } 652 653 /* 654 * bridge_lookup_member: 655 * 656 * Lookup a bridge member interface. 657 */ 658 static struct bridge_iflist * 659 bridge_lookup_member(struct bridge_softc *sc, const char *name, struct psref *psref) 660 { 661 struct bridge_iflist *bif; 662 struct ifnet *ifp; 663 int s; 664 665 BRIDGE_PSZ_RENTER(s); 666 667 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 668 ifp = bif->bif_ifp; 669 if (strcmp(ifp->if_xname, name) == 0) 670 break; 671 } 672 if (bif != NULL) 673 bridge_acquire_member(sc, bif, psref); 674 675 BRIDGE_PSZ_REXIT(s); 676 677 return bif; 678 } 679 680 /* 681 * bridge_lookup_member_if: 682 * 683 * Lookup a bridge member interface by ifnet*. 684 */ 685 static struct bridge_iflist * 686 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp, 687 struct psref *psref) 688 { 689 struct bridge_iflist *bif; 690 int s; 691 692 BRIDGE_PSZ_RENTER(s); 693 694 bif = member_ifp->if_bridgeif; 695 if (bif != NULL) { 696 psref_acquire(psref, &bif->bif_psref, 697 bridge_psref_class); 698 } 699 700 BRIDGE_PSZ_REXIT(s); 701 702 return bif; 703 } 704 705 static void 706 bridge_acquire_member(struct bridge_softc *sc, struct bridge_iflist *bif, 707 struct psref *psref) 708 { 709 710 psref_acquire(psref, &bif->bif_psref, bridge_psref_class); 711 } 712 713 /* 714 * bridge_release_member: 715 * 716 * Release the specified member interface. 717 */ 718 static void 719 bridge_release_member(struct bridge_softc *sc, struct bridge_iflist *bif, 720 struct psref *psref) 721 { 722 723 psref_release(psref, &bif->bif_psref, bridge_psref_class); 724 } 725 726 /* 727 * bridge_delete_member: 728 * 729 * Delete the specified member interface. 730 */ 731 static void 732 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 733 { 734 struct ifnet *ifs = bif->bif_ifp; 735 736 KASSERT(BRIDGE_LOCKED(sc)); 737 738 ifs->_if_input = ether_input; 739 ifs->if_bridge = NULL; 740 ifs->if_bridgeif = NULL; 741 742 PSLIST_WRITER_REMOVE(bif, bif_next); 743 BRIDGE_PSZ_PERFORM(sc); 744 BRIDGE_UNLOCK(sc); 745 746 switch (ifs->if_type) { 747 case IFT_ETHER: 748 case IFT_L2TP: 749 /* 750 * Take the interface out of promiscuous mode. 751 * Don't call it with holding a spin lock. 752 */ 753 (void) ifpromisc(ifs, 0); 754 IFNET_LOCK(ifs); 755 (void) ether_disable_vlan_mtu(ifs); 756 IFNET_UNLOCK(ifs); 757 break; 758 default: 759 #ifdef DIAGNOSTIC 760 panic("%s: impossible", __func__); 761 #endif 762 break; 763 } 764 765 psref_target_destroy(&bif->bif_psref, bridge_psref_class); 766 767 PSLIST_ENTRY_DESTROY(bif, bif_next); 768 kmem_free(bif, sizeof(*bif)); 769 770 BRIDGE_LOCK(sc); 771 } 772 773 /* 774 * bridge_calc_csum_flags: 775 * 776 * Calculate logical and b/w csum flags each member interface supports. 777 */ 778 void 779 bridge_calc_csum_flags(struct bridge_softc *sc) 780 { 781 struct bridge_iflist *bif; 782 struct ifnet *ifs; 783 int flags = ~0; 784 785 BRIDGE_LOCK(sc); 786 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 787 ifs = bif->bif_ifp; 788 flags &= ifs->if_csum_flags_tx; 789 } 790 sc->sc_csum_flags_tx = flags; 791 BRIDGE_UNLOCK(sc); 792 #ifdef DEBUG 793 printf("%s: 0x%x\n", __func__, flags); 794 #endif 795 } 796 797 static int 798 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 799 { 800 struct ifbreq *req = arg; 801 struct bridge_iflist *bif = NULL; 802 struct ifnet *ifs; 803 int error = 0; 804 struct psref psref; 805 806 ifs = if_get(req->ifbr_ifsname, &psref); 807 if (ifs == NULL) 808 return ENOENT; 809 810 if (ifs->if_bridge == sc) { 811 error = EEXIST; 812 goto out; 813 } 814 815 if (ifs->if_bridge != NULL) { 816 error = EBUSY; 817 goto out; 818 } 819 820 if (ifs->_if_input != ether_input) { 821 error = EINVAL; 822 goto out; 823 } 824 825 /* FIXME: doesn't work with non-IFF_SIMPLEX interfaces */ 826 if ((ifs->if_flags & IFF_SIMPLEX) == 0) { 827 error = EINVAL; 828 goto out; 829 } 830 831 bif = kmem_alloc(sizeof(*bif), KM_SLEEP); 832 833 switch (ifs->if_type) { 834 case IFT_ETHER: 835 if (sc->sc_if.if_mtu != ifs->if_mtu) { 836 error = EINVAL; 837 goto out; 838 } 839 /* FALLTHROUGH */ 840 case IFT_L2TP: 841 IFNET_LOCK(ifs); 842 error = ether_enable_vlan_mtu(ifs); 843 IFNET_UNLOCK(ifs); 844 if (error > 0) 845 goto out; 846 /* 847 * Place the interface into promiscuous mode. 848 */ 849 error = ifpromisc(ifs, 1); 850 if (error) 851 goto out; 852 break; 853 default: 854 error = EINVAL; 855 goto out; 856 } 857 858 bif->bif_ifp = ifs; 859 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 860 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 861 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 862 PSLIST_ENTRY_INIT(bif, bif_next); 863 psref_target_init(&bif->bif_psref, bridge_psref_class); 864 865 BRIDGE_LOCK(sc); 866 867 ifs->if_bridge = sc; 868 ifs->if_bridgeif = bif; 869 PSLIST_WRITER_INSERT_HEAD(&sc->sc_iflist_psref.bip_iflist, bif, bif_next); 870 ifs->_if_input = bridge_input; 871 872 BRIDGE_UNLOCK(sc); 873 874 bridge_calc_csum_flags(sc); 875 876 if (sc->sc_if.if_flags & IFF_RUNNING) 877 bstp_initialization(sc); 878 else 879 bstp_stop(sc); 880 881 out: 882 if_put(ifs, &psref); 883 if (error) { 884 if (bif != NULL) 885 kmem_free(bif, sizeof(*bif)); 886 } 887 return error; 888 } 889 890 static int 891 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 892 { 893 struct ifbreq *req = arg; 894 const char *name = req->ifbr_ifsname; 895 struct bridge_iflist *bif; 896 struct ifnet *ifs; 897 898 BRIDGE_LOCK(sc); 899 900 /* 901 * Don't use bridge_lookup_member. We want to get a member 902 * with bif_refs == 0. 903 */ 904 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 905 ifs = bif->bif_ifp; 906 if (strcmp(ifs->if_xname, name) == 0) 907 break; 908 } 909 910 if (bif == NULL) { 911 BRIDGE_UNLOCK(sc); 912 return ENOENT; 913 } 914 915 bridge_delete_member(sc, bif); 916 917 BRIDGE_UNLOCK(sc); 918 919 bridge_rtdelete(sc, ifs); 920 bridge_calc_csum_flags(sc); 921 922 if (sc->sc_if.if_flags & IFF_RUNNING) 923 bstp_initialization(sc); 924 925 return 0; 926 } 927 928 static int 929 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 930 { 931 struct ifbreq *req = arg; 932 struct bridge_iflist *bif; 933 struct psref psref; 934 935 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 936 if (bif == NULL) 937 return ENOENT; 938 939 req->ifbr_ifsflags = bif->bif_flags; 940 req->ifbr_state = bif->bif_state; 941 req->ifbr_priority = bif->bif_priority; 942 req->ifbr_path_cost = bif->bif_path_cost; 943 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 944 945 bridge_release_member(sc, bif, &psref); 946 947 return 0; 948 } 949 950 static int 951 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 952 { 953 struct ifbreq *req = arg; 954 struct bridge_iflist *bif; 955 struct psref psref; 956 957 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 958 if (bif == NULL) 959 return ENOENT; 960 961 if (req->ifbr_ifsflags & IFBIF_STP) { 962 switch (bif->bif_ifp->if_type) { 963 case IFT_ETHER: 964 case IFT_L2TP: 965 /* These can do spanning tree. */ 966 break; 967 968 default: 969 /* Nothing else can. */ 970 bridge_release_member(sc, bif, &psref); 971 return EINVAL; 972 } 973 } 974 975 bif->bif_flags = req->ifbr_ifsflags; 976 977 bridge_release_member(sc, bif, &psref); 978 979 if (sc->sc_if.if_flags & IFF_RUNNING) 980 bstp_initialization(sc); 981 982 return 0; 983 } 984 985 static int 986 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 987 { 988 struct ifbrparam *param = arg; 989 990 sc->sc_brtmax = param->ifbrp_csize; 991 bridge_rttrim(sc); 992 993 return 0; 994 } 995 996 static int 997 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 998 { 999 struct ifbrparam *param = arg; 1000 1001 param->ifbrp_csize = sc->sc_brtmax; 1002 1003 return 0; 1004 } 1005 1006 static int 1007 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1008 { 1009 struct ifbifconf *bifc = arg; 1010 struct bridge_iflist *bif; 1011 struct ifbreq *breqs; 1012 int i, count, error = 0; 1013 1014 retry: 1015 BRIDGE_LOCK(sc); 1016 count = 0; 1017 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 1018 count++; 1019 BRIDGE_UNLOCK(sc); 1020 1021 if (count == 0) { 1022 bifc->ifbic_len = 0; 1023 return 0; 1024 } 1025 1026 if (bifc->ifbic_len == 0 || bifc->ifbic_len < (sizeof(*breqs) * count)) { 1027 /* Tell that a larger buffer is needed */ 1028 bifc->ifbic_len = sizeof(*breqs) * count; 1029 return 0; 1030 } 1031 1032 breqs = kmem_alloc(sizeof(*breqs) * count, KM_SLEEP); 1033 1034 BRIDGE_LOCK(sc); 1035 1036 i = 0; 1037 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 1038 i++; 1039 if (i > count) { 1040 /* 1041 * The number of members has been increased. 1042 * We need more memory! 1043 */ 1044 BRIDGE_UNLOCK(sc); 1045 kmem_free(breqs, sizeof(*breqs) * count); 1046 goto retry; 1047 } 1048 1049 i = 0; 1050 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 1051 struct ifbreq *breq = &breqs[i++]; 1052 memset(breq, 0, sizeof(*breq)); 1053 1054 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, 1055 sizeof(breq->ifbr_ifsname)); 1056 breq->ifbr_ifsflags = bif->bif_flags; 1057 breq->ifbr_state = bif->bif_state; 1058 breq->ifbr_priority = bif->bif_priority; 1059 breq->ifbr_path_cost = bif->bif_path_cost; 1060 breq->ifbr_portno = bif->bif_ifp->if_index & 0xff; 1061 } 1062 1063 /* Don't call copyout with holding the mutex */ 1064 BRIDGE_UNLOCK(sc); 1065 1066 for (i = 0; i < count; i++) { 1067 error = copyout(&breqs[i], bifc->ifbic_req + i, sizeof(*breqs)); 1068 if (error) 1069 break; 1070 } 1071 bifc->ifbic_len = sizeof(*breqs) * i; 1072 1073 kmem_free(breqs, sizeof(*breqs) * count); 1074 1075 return error; 1076 } 1077 1078 static int 1079 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1080 { 1081 struct ifbaconf *bac = arg; 1082 struct bridge_rtnode *brt; 1083 struct ifbareq bareq; 1084 int count = 0, error = 0, len; 1085 1086 if (bac->ifbac_len == 0) 1087 return 0; 1088 1089 BRIDGE_RT_LOCK(sc); 1090 1091 /* The passed buffer is not enough, tell a required size. */ 1092 if (bac->ifbac_len < (sizeof(bareq) * sc->sc_brtcnt)) { 1093 count = sc->sc_brtcnt; 1094 goto out; 1095 } 1096 1097 len = bac->ifbac_len; 1098 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 1099 if (len < sizeof(bareq)) 1100 goto out; 1101 memset(&bareq, 0, sizeof(bareq)); 1102 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1103 sizeof(bareq.ifba_ifsname)); 1104 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1105 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1106 bareq.ifba_expire = brt->brt_expire - time_uptime; 1107 } else 1108 bareq.ifba_expire = 0; 1109 bareq.ifba_flags = brt->brt_flags; 1110 1111 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1112 if (error) 1113 goto out; 1114 count++; 1115 len -= sizeof(bareq); 1116 } 1117 out: 1118 BRIDGE_RT_UNLOCK(sc); 1119 1120 bac->ifbac_len = sizeof(bareq) * count; 1121 return error; 1122 } 1123 1124 static int 1125 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1126 { 1127 struct ifbareq *req = arg; 1128 struct bridge_iflist *bif; 1129 int error; 1130 struct psref psref; 1131 1132 bif = bridge_lookup_member(sc, req->ifba_ifsname, &psref); 1133 if (bif == NULL) 1134 return ENOENT; 1135 1136 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1137 req->ifba_flags); 1138 1139 bridge_release_member(sc, bif, &psref); 1140 1141 return error; 1142 } 1143 1144 static int 1145 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1146 { 1147 struct ifbrparam *param = arg; 1148 1149 sc->sc_brttimeout = param->ifbrp_ctime; 1150 1151 return 0; 1152 } 1153 1154 static int 1155 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1156 { 1157 struct ifbrparam *param = arg; 1158 1159 param->ifbrp_ctime = sc->sc_brttimeout; 1160 1161 return 0; 1162 } 1163 1164 static int 1165 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1166 { 1167 struct ifbareq *req = arg; 1168 1169 return (bridge_rtdaddr(sc, req->ifba_dst)); 1170 } 1171 1172 static int 1173 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1174 { 1175 struct ifbreq *req = arg; 1176 1177 bridge_rtflush(sc, req->ifbr_ifsflags); 1178 1179 return 0; 1180 } 1181 1182 static int 1183 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1184 { 1185 struct ifbrparam *param = arg; 1186 1187 param->ifbrp_prio = sc->sc_bridge_priority; 1188 1189 return 0; 1190 } 1191 1192 static int 1193 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1194 { 1195 struct ifbrparam *param = arg; 1196 1197 sc->sc_bridge_priority = param->ifbrp_prio; 1198 1199 if (sc->sc_if.if_flags & IFF_RUNNING) 1200 bstp_initialization(sc); 1201 1202 return 0; 1203 } 1204 1205 static int 1206 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1207 { 1208 struct ifbrparam *param = arg; 1209 1210 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1211 1212 return 0; 1213 } 1214 1215 static int 1216 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1217 { 1218 struct ifbrparam *param = arg; 1219 1220 if (param->ifbrp_hellotime == 0) 1221 return EINVAL; 1222 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1223 1224 if (sc->sc_if.if_flags & IFF_RUNNING) 1225 bstp_initialization(sc); 1226 1227 return 0; 1228 } 1229 1230 static int 1231 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1232 { 1233 struct ifbrparam *param = arg; 1234 1235 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1236 1237 return 0; 1238 } 1239 1240 static int 1241 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1242 { 1243 struct ifbrparam *param = arg; 1244 1245 if (param->ifbrp_fwddelay == 0) 1246 return EINVAL; 1247 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1248 1249 if (sc->sc_if.if_flags & IFF_RUNNING) 1250 bstp_initialization(sc); 1251 1252 return 0; 1253 } 1254 1255 static int 1256 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1257 { 1258 struct ifbrparam *param = arg; 1259 1260 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1261 1262 return 0; 1263 } 1264 1265 static int 1266 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1267 { 1268 struct ifbrparam *param = arg; 1269 1270 if (param->ifbrp_maxage == 0) 1271 return EINVAL; 1272 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1273 1274 if (sc->sc_if.if_flags & IFF_RUNNING) 1275 bstp_initialization(sc); 1276 1277 return 0; 1278 } 1279 1280 static int 1281 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1282 { 1283 struct ifbreq *req = arg; 1284 struct bridge_iflist *bif; 1285 struct psref psref; 1286 1287 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1288 if (bif == NULL) 1289 return ENOENT; 1290 1291 bif->bif_priority = req->ifbr_priority; 1292 1293 if (sc->sc_if.if_flags & IFF_RUNNING) 1294 bstp_initialization(sc); 1295 1296 bridge_release_member(sc, bif, &psref); 1297 1298 return 0; 1299 } 1300 1301 #if defined(BRIDGE_IPF) 1302 static int 1303 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1304 { 1305 struct ifbrparam *param = arg; 1306 1307 param->ifbrp_filter = sc->sc_filter_flags; 1308 1309 return 0; 1310 } 1311 1312 static int 1313 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1314 { 1315 struct ifbrparam *param = arg; 1316 uint32_t nflags, oflags; 1317 1318 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1319 return EINVAL; 1320 1321 nflags = param->ifbrp_filter; 1322 oflags = sc->sc_filter_flags; 1323 1324 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1325 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1326 sc->sc_if.if_pfil); 1327 } 1328 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1329 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1330 sc->sc_if.if_pfil); 1331 } 1332 1333 sc->sc_filter_flags = nflags; 1334 1335 return 0; 1336 } 1337 #endif /* BRIDGE_IPF */ 1338 1339 static int 1340 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1341 { 1342 struct ifbreq *req = arg; 1343 struct bridge_iflist *bif; 1344 struct psref psref; 1345 1346 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1347 if (bif == NULL) 1348 return ENOENT; 1349 1350 bif->bif_path_cost = req->ifbr_path_cost; 1351 1352 if (sc->sc_if.if_flags & IFF_RUNNING) 1353 bstp_initialization(sc); 1354 1355 bridge_release_member(sc, bif, &psref); 1356 1357 return 0; 1358 } 1359 1360 /* 1361 * bridge_ifdetach: 1362 * 1363 * Detach an interface from a bridge. Called when a member 1364 * interface is detaching. 1365 */ 1366 void 1367 bridge_ifdetach(struct ifnet *ifp) 1368 { 1369 struct bridge_softc *sc = ifp->if_bridge; 1370 struct ifbreq breq; 1371 1372 /* ioctl_lock should prevent this from happening */ 1373 KASSERT(sc != NULL); 1374 1375 memset(&breq, 0, sizeof(breq)); 1376 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1377 1378 (void) bridge_ioctl_del(sc, &breq); 1379 } 1380 1381 /* 1382 * bridge_init: 1383 * 1384 * Initialize a bridge interface. 1385 */ 1386 static int 1387 bridge_init(struct ifnet *ifp) 1388 { 1389 struct bridge_softc *sc = ifp->if_softc; 1390 1391 KASSERT((ifp->if_flags & IFF_RUNNING) == 0); 1392 1393 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1394 bridge_timer, sc); 1395 bstp_initialization(sc); 1396 1397 ifp->if_flags |= IFF_RUNNING; 1398 return 0; 1399 } 1400 1401 /* 1402 * bridge_stop: 1403 * 1404 * Stop the bridge interface. 1405 */ 1406 static void 1407 bridge_stop(struct ifnet *ifp, int disable) 1408 { 1409 struct bridge_softc *sc = ifp->if_softc; 1410 1411 KASSERT((ifp->if_flags & IFF_RUNNING) != 0); 1412 ifp->if_flags &= ~IFF_RUNNING; 1413 1414 callout_halt(&sc->sc_brcallout, NULL); 1415 workqueue_wait(sc->sc_rtage_wq, &sc->sc_rtage_wk); 1416 bstp_stop(sc); 1417 bridge_rtflush(sc, IFBF_FLUSHDYN); 1418 } 1419 1420 /* 1421 * bridge_enqueue: 1422 * 1423 * Enqueue a packet on a bridge member interface. 1424 */ 1425 void 1426 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1427 int runfilt) 1428 { 1429 int len, error; 1430 short mflags; 1431 1432 if (runfilt) { 1433 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1434 dst_ifp, PFIL_OUT) != 0) { 1435 if (m != NULL) 1436 m_freem(m); 1437 return; 1438 } 1439 if (m == NULL) 1440 return; 1441 } 1442 1443 #ifdef ALTQ 1444 KERNEL_LOCK(1, NULL); 1445 /* 1446 * If ALTQ is enabled on the member interface, do 1447 * classification; the queueing discipline might 1448 * not require classification, but might require 1449 * the address family/header pointer in the pktattr. 1450 */ 1451 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1452 /* XXX IFT_ETHER */ 1453 altq_etherclassify(&dst_ifp->if_snd, m); 1454 } 1455 KERNEL_UNLOCK_ONE(NULL); 1456 #endif /* ALTQ */ 1457 1458 len = m->m_pkthdr.len; 1459 mflags = m->m_flags; 1460 1461 error = if_transmit_lock(dst_ifp, m); 1462 if (error) { 1463 /* mbuf is already freed */ 1464 sc->sc_if.if_oerrors++; 1465 return; 1466 } 1467 1468 sc->sc_if.if_opackets++; 1469 sc->sc_if.if_obytes += len; 1470 if (mflags & M_MCAST) 1471 sc->sc_if.if_omcasts++; 1472 } 1473 1474 /* 1475 * bridge_output: 1476 * 1477 * Send output from a bridge member interface. This 1478 * performs the bridging function for locally originated 1479 * packets. 1480 * 1481 * The mbuf has the Ethernet header already attached. We must 1482 * enqueue or free the mbuf before returning. 1483 */ 1484 int 1485 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1486 const struct rtentry *rt) 1487 { 1488 struct ether_header *eh; 1489 struct ifnet *dst_if; 1490 struct bridge_softc *sc; 1491 struct mbuf *n; 1492 int s; 1493 1494 /* 1495 * bridge_output() is called from ether_output(), furthermore 1496 * ifp argument doesn't point to bridge(4). So, don't assert 1497 * IFEF_MPSAFE here. 1498 */ 1499 1500 if (m->m_len < ETHER_HDR_LEN) { 1501 m = m_pullup(m, ETHER_HDR_LEN); 1502 if (m == NULL) 1503 return 0; 1504 } 1505 1506 eh = mtod(m, struct ether_header *); 1507 sc = ifp->if_bridge; 1508 1509 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1510 if (memcmp(etherbroadcastaddr, 1511 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1512 m->m_flags |= M_BCAST; 1513 else 1514 m->m_flags |= M_MCAST; 1515 } 1516 1517 /* 1518 * If bridge is down, but the original output interface is up, 1519 * go ahead and send out that interface. Otherwise, the packet 1520 * is dropped below. 1521 */ 1522 if (__predict_false(sc == NULL) || 1523 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1524 dst_if = ifp; 1525 goto unicast_asis; 1526 } 1527 1528 /* 1529 * If the packet is a multicast, or we don't know a better way to 1530 * get there, send to all interfaces. 1531 */ 1532 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0) 1533 dst_if = NULL; 1534 else 1535 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1536 1537 /* 1538 * In general, we need to handle TX offload in software before 1539 * enqueueing a packet. However, we can send it as is in the 1540 * cases of unicast via (1) the source interface, or (2) an 1541 * interface which supports the specified offload options. 1542 * For multicast or broadcast, send it as is only if (3) all 1543 * the member interfaces support the specified options. 1544 */ 1545 1546 /* 1547 * Unicast via the source interface. 1548 */ 1549 if (dst_if == ifp) 1550 goto unicast_asis; 1551 1552 /* 1553 * Unicast via other interface. 1554 */ 1555 if (dst_if != NULL) { 1556 KASSERT(m->m_flags & M_PKTHDR); 1557 if (TX_OFFLOAD_SUPPORTED(dst_if->if_csum_flags_tx, 1558 m->m_pkthdr.csum_flags)) { 1559 /* 1560 * Unicast via an interface which supports the 1561 * specified offload options. 1562 */ 1563 goto unicast_asis; 1564 } 1565 1566 /* 1567 * Handle TX offload in software. For TSO, a packet is 1568 * split into multiple chunks. Thus, the return value of 1569 * ether_sw_offload_tx() is mbuf queue consists of them. 1570 */ 1571 m = ether_sw_offload_tx(ifp, m); 1572 if (m == NULL) 1573 return 0; 1574 1575 do { 1576 n = m->m_nextpkt; 1577 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1578 m_freem(m); 1579 else 1580 bridge_enqueue(sc, dst_if, m, 0); 1581 m = n; 1582 } while (m != NULL); 1583 1584 return 0; 1585 } 1586 1587 /* 1588 * Multicast or broadcast. 1589 */ 1590 if (TX_OFFLOAD_SUPPORTED(sc->sc_csum_flags_tx, 1591 m->m_pkthdr.csum_flags)) { 1592 /* 1593 * Specified TX offload options are supported by all 1594 * the member interfaces of this bridge. 1595 */ 1596 m->m_nextpkt = NULL; /* XXX */ 1597 } else { 1598 /* 1599 * Otherwise, handle TX offload in software. 1600 */ 1601 m = ether_sw_offload_tx(ifp, m); 1602 if (m == NULL) 1603 return 0; 1604 } 1605 1606 do { 1607 /* XXX Should call bridge_broadcast, but there are locking 1608 * issues which need resolving first. */ 1609 struct bridge_iflist *bif; 1610 struct mbuf *mc; 1611 bool used = false; 1612 1613 n = m->m_nextpkt; 1614 1615 BRIDGE_PSZ_RENTER(s); 1616 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1617 struct psref psref; 1618 1619 bridge_acquire_member(sc, bif, &psref); 1620 BRIDGE_PSZ_REXIT(s); 1621 1622 dst_if = bif->bif_ifp; 1623 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1624 goto next; 1625 1626 /* 1627 * If this is not the original output interface, 1628 * and the interface is participating in spanning 1629 * tree, make sure the port is in a state that 1630 * allows forwarding. 1631 */ 1632 if (dst_if != ifp && 1633 (bif->bif_flags & IFBIF_STP) != 0) { 1634 switch (bif->bif_state) { 1635 case BSTP_IFSTATE_BLOCKING: 1636 case BSTP_IFSTATE_LISTENING: 1637 case BSTP_IFSTATE_DISABLED: 1638 goto next; 1639 } 1640 } 1641 1642 if (PSLIST_READER_NEXT(bif, struct bridge_iflist, 1643 bif_next) == NULL && 1644 ((m->m_flags & (M_MCAST | M_BCAST)) == 0 || 1645 dst_if == ifp)) 1646 { 1647 used = true; 1648 mc = m; 1649 } else { 1650 mc = m_copypacket(m, M_DONTWAIT); 1651 if (mc == NULL) { 1652 sc->sc_if.if_oerrors++; 1653 goto next; 1654 } 1655 } 1656 1657 bridge_enqueue(sc, dst_if, mc, 0); 1658 1659 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0 && 1660 dst_if != ifp) 1661 { 1662 if (PSLIST_READER_NEXT(bif, 1663 struct bridge_iflist, bif_next) == NULL) 1664 { 1665 used = true; 1666 mc = m; 1667 } else { 1668 mc = m_copypacket(m, M_DONTWAIT); 1669 if (mc == NULL) { 1670 sc->sc_if.if_oerrors++; 1671 goto next; 1672 } 1673 } 1674 1675 m_set_rcvif(mc, dst_if); 1676 mc->m_flags &= ~M_PROMISC; 1677 1678 s = splsoftnet(); 1679 KERNEL_LOCK_UNLESS_IFP_MPSAFE(dst_if); 1680 ether_input(dst_if, mc); 1681 KERNEL_UNLOCK_UNLESS_IFP_MPSAFE(dst_if); 1682 splx(s); 1683 } 1684 1685 next: 1686 BRIDGE_PSZ_RENTER(s); 1687 bridge_release_member(sc, bif, &psref); 1688 1689 /* Guarantee we don't re-enter the loop as we already 1690 * decided we're at the end. */ 1691 if (used) 1692 break; 1693 } 1694 BRIDGE_PSZ_REXIT(s); 1695 1696 if (!used) 1697 m_freem(m); 1698 1699 m = n; 1700 } while (m != NULL); 1701 return 0; 1702 1703 unicast_asis: 1704 /* 1705 * XXX Spanning tree consideration here? 1706 */ 1707 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1708 m_freem(m); 1709 else 1710 bridge_enqueue(sc, dst_if, m, 0); 1711 return 0; 1712 } 1713 1714 /* 1715 * bridge_start: 1716 * 1717 * Start output on a bridge. 1718 * 1719 * NOTE: This routine should never be called in this implementation. 1720 */ 1721 static void 1722 bridge_start(struct ifnet *ifp) 1723 { 1724 1725 printf("%s: bridge_start() called\n", ifp->if_xname); 1726 } 1727 1728 /* 1729 * bridge_forward: 1730 * 1731 * The forwarding function of the bridge. 1732 */ 1733 static void 1734 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1735 { 1736 struct bridge_iflist *bif; 1737 struct ifnet *src_if, *dst_if; 1738 struct ether_header *eh; 1739 struct psref psref; 1740 struct psref psref_src; 1741 DECLARE_LOCK_VARIABLE; 1742 1743 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1744 return; 1745 1746 src_if = m_get_rcvif_psref(m, &psref_src); 1747 if (src_if == NULL) { 1748 /* Interface is being destroyed? */ 1749 m_freem(m); 1750 goto out; 1751 } 1752 1753 sc->sc_if.if_ipackets++; 1754 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1755 1756 /* 1757 * Look up the bridge_iflist. 1758 */ 1759 bif = bridge_lookup_member_if(sc, src_if, &psref); 1760 if (bif == NULL) { 1761 /* Interface is not a bridge member (anymore?) */ 1762 m_freem(m); 1763 goto out; 1764 } 1765 1766 if (bif->bif_flags & IFBIF_STP) { 1767 switch (bif->bif_state) { 1768 case BSTP_IFSTATE_BLOCKING: 1769 case BSTP_IFSTATE_LISTENING: 1770 case BSTP_IFSTATE_DISABLED: 1771 m_freem(m); 1772 bridge_release_member(sc, bif, &psref); 1773 goto out; 1774 } 1775 } 1776 1777 eh = mtod(m, struct ether_header *); 1778 1779 /* 1780 * If the interface is learning, and the source 1781 * address is valid and not multicast, record 1782 * the address. 1783 */ 1784 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1785 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1786 (eh->ether_shost[0] == 0 && 1787 eh->ether_shost[1] == 0 && 1788 eh->ether_shost[2] == 0 && 1789 eh->ether_shost[3] == 0 && 1790 eh->ether_shost[4] == 0 && 1791 eh->ether_shost[5] == 0) == 0) { 1792 (void) bridge_rtupdate(sc, eh->ether_shost, 1793 src_if, 0, IFBAF_DYNAMIC); 1794 } 1795 1796 if ((bif->bif_flags & IFBIF_STP) != 0 && 1797 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1798 m_freem(m); 1799 bridge_release_member(sc, bif, &psref); 1800 goto out; 1801 } 1802 1803 bridge_release_member(sc, bif, &psref); 1804 1805 /* 1806 * At this point, the port either doesn't participate 1807 * in spanning tree or it is in the forwarding state. 1808 */ 1809 1810 /* 1811 * If the packet is unicast, destined for someone on 1812 * "this" side of the bridge, drop it. 1813 */ 1814 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1815 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1816 if (src_if == dst_if) { 1817 m_freem(m); 1818 goto out; 1819 } 1820 } else { 1821 /* ...forward it to all interfaces. */ 1822 sc->sc_if.if_imcasts++; 1823 dst_if = NULL; 1824 } 1825 1826 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, src_if, PFIL_IN) != 0) { 1827 if (m != NULL) 1828 m_freem(m); 1829 goto out; 1830 } 1831 if (m == NULL) 1832 goto out; 1833 1834 if (dst_if == NULL) { 1835 bridge_broadcast(sc, src_if, m); 1836 goto out; 1837 } 1838 1839 m_put_rcvif_psref(src_if, &psref_src); 1840 src_if = NULL; 1841 1842 /* 1843 * At this point, we're dealing with a unicast frame 1844 * going to a different interface. 1845 */ 1846 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1847 m_freem(m); 1848 goto out; 1849 } 1850 1851 bif = bridge_lookup_member_if(sc, dst_if, &psref); 1852 if (bif == NULL) { 1853 /* Not a member of the bridge (anymore?) */ 1854 m_freem(m); 1855 goto out; 1856 } 1857 1858 if (bif->bif_flags & IFBIF_STP) { 1859 switch (bif->bif_state) { 1860 case BSTP_IFSTATE_DISABLED: 1861 case BSTP_IFSTATE_BLOCKING: 1862 m_freem(m); 1863 bridge_release_member(sc, bif, &psref); 1864 goto out; 1865 } 1866 } 1867 1868 bridge_release_member(sc, bif, &psref); 1869 1870 /* 1871 * Before enqueueing this packet to the destination interface, 1872 * clear any in-bound checksum flags to prevent them from being 1873 * misused as out-bound flags. 1874 */ 1875 m->m_pkthdr.csum_flags = 0; 1876 1877 ACQUIRE_GLOBAL_LOCKS(); 1878 bridge_enqueue(sc, dst_if, m, 1); 1879 RELEASE_GLOBAL_LOCKS(); 1880 out: 1881 if (src_if != NULL) 1882 m_put_rcvif_psref(src_if, &psref_src); 1883 return; 1884 } 1885 1886 static bool 1887 bstp_state_before_learning(struct bridge_iflist *bif) 1888 { 1889 if (bif->bif_flags & IFBIF_STP) { 1890 switch (bif->bif_state) { 1891 case BSTP_IFSTATE_BLOCKING: 1892 case BSTP_IFSTATE_LISTENING: 1893 case BSTP_IFSTATE_DISABLED: 1894 return true; 1895 } 1896 } 1897 return false; 1898 } 1899 1900 static bool 1901 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1902 { 1903 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1904 1905 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1906 #if NCARP > 0 1907 || (bif->bif_ifp->if_carp && 1908 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1909 #endif /* NCARP > 0 */ 1910 ) 1911 return true; 1912 1913 return false; 1914 } 1915 1916 /* 1917 * bridge_input: 1918 * 1919 * Receive input from a member interface. Queue the packet for 1920 * bridging if it is not for us. 1921 */ 1922 static void 1923 bridge_input(struct ifnet *ifp, struct mbuf *m) 1924 { 1925 struct bridge_softc *sc = ifp->if_bridge; 1926 struct bridge_iflist *bif; 1927 struct ether_header *eh; 1928 struct psref psref; 1929 int bound; 1930 DECLARE_LOCK_VARIABLE; 1931 1932 KASSERT(!cpu_intr_p()); 1933 1934 if (__predict_false(sc == NULL) || 1935 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1936 ACQUIRE_GLOBAL_LOCKS(); 1937 ether_input(ifp, m); 1938 RELEASE_GLOBAL_LOCKS(); 1939 return; 1940 } 1941 1942 bound = curlwp_bind(); 1943 bif = bridge_lookup_member_if(sc, ifp, &psref); 1944 if (bif == NULL) { 1945 curlwp_bindx(bound); 1946 ACQUIRE_GLOBAL_LOCKS(); 1947 ether_input(ifp, m); 1948 RELEASE_GLOBAL_LOCKS(); 1949 return; 1950 } 1951 1952 eh = mtod(m, struct ether_header *); 1953 1954 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1955 if (memcmp(etherbroadcastaddr, 1956 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1957 m->m_flags |= M_BCAST; 1958 else 1959 m->m_flags |= M_MCAST; 1960 } 1961 1962 /* 1963 * A 'fast' path for packets addressed to interfaces that are 1964 * part of this bridge. 1965 */ 1966 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 1967 !bstp_state_before_learning(bif)) { 1968 struct bridge_iflist *_bif; 1969 struct ifnet *_ifp = NULL; 1970 int s; 1971 struct psref _psref; 1972 1973 BRIDGE_PSZ_RENTER(s); 1974 BRIDGE_IFLIST_READER_FOREACH(_bif, sc) { 1975 /* It is destined for us. */ 1976 if (bridge_ourether(_bif, eh, 0)) { 1977 bridge_acquire_member(sc, _bif, &_psref); 1978 BRIDGE_PSZ_REXIT(s); 1979 if (_bif->bif_flags & IFBIF_LEARNING) 1980 (void) bridge_rtupdate(sc, 1981 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1982 m_set_rcvif(m, _bif->bif_ifp); 1983 _ifp = _bif->bif_ifp; 1984 bridge_release_member(sc, _bif, &_psref); 1985 goto out; 1986 } 1987 1988 /* We just received a packet that we sent out. */ 1989 if (bridge_ourether(_bif, eh, 1)) 1990 break; 1991 } 1992 BRIDGE_PSZ_REXIT(s); 1993 out: 1994 1995 if (_bif != NULL) { 1996 bridge_release_member(sc, bif, &psref); 1997 curlwp_bindx(bound); 1998 if (_ifp != NULL) { 1999 m->m_flags &= ~M_PROMISC; 2000 ACQUIRE_GLOBAL_LOCKS(); 2001 ether_input(_ifp, m); 2002 RELEASE_GLOBAL_LOCKS(); 2003 } else 2004 m_freem(m); 2005 return; 2006 } 2007 } 2008 2009 /* Tap off 802.1D packets; they do not get forwarded. */ 2010 if (bif->bif_flags & IFBIF_STP && 2011 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 2012 bstp_input(sc, bif, m); 2013 bridge_release_member(sc, bif, &psref); 2014 curlwp_bindx(bound); 2015 return; 2016 } 2017 2018 /* 2019 * A normal switch would discard the packet here, but that's not what 2020 * we've done historically. This also prevents some obnoxious behaviour. 2021 */ 2022 if (bstp_state_before_learning(bif)) { 2023 bridge_release_member(sc, bif, &psref); 2024 curlwp_bindx(bound); 2025 ACQUIRE_GLOBAL_LOCKS(); 2026 ether_input(ifp, m); 2027 RELEASE_GLOBAL_LOCKS(); 2028 return; 2029 } 2030 2031 bridge_release_member(sc, bif, &psref); 2032 2033 bridge_forward(sc, m); 2034 2035 curlwp_bindx(bound); 2036 } 2037 2038 /* 2039 * bridge_broadcast: 2040 * 2041 * Send a frame to all interfaces that are members of 2042 * the bridge, except for the one on which the packet 2043 * arrived. 2044 */ 2045 static void 2046 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2047 struct mbuf *m) 2048 { 2049 struct bridge_iflist *bif; 2050 struct mbuf *mc; 2051 struct ifnet *dst_if; 2052 bool bmcast; 2053 int s; 2054 DECLARE_LOCK_VARIABLE; 2055 2056 bmcast = m->m_flags & (M_BCAST|M_MCAST); 2057 2058 BRIDGE_PSZ_RENTER(s); 2059 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 2060 struct psref psref; 2061 2062 bridge_acquire_member(sc, bif, &psref); 2063 BRIDGE_PSZ_REXIT(s); 2064 2065 dst_if = bif->bif_ifp; 2066 2067 if (bif->bif_flags & IFBIF_STP) { 2068 switch (bif->bif_state) { 2069 case BSTP_IFSTATE_BLOCKING: 2070 case BSTP_IFSTATE_DISABLED: 2071 goto next; 2072 } 2073 } 2074 2075 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 2076 goto next; 2077 2078 if ((dst_if->if_flags & IFF_RUNNING) == 0) 2079 goto next; 2080 2081 if (dst_if != src_if) { 2082 mc = m_copypacket(m, M_DONTWAIT); 2083 if (mc == NULL) { 2084 sc->sc_if.if_oerrors++; 2085 goto next; 2086 } 2087 /* 2088 * Before enqueueing this packet to the destination 2089 * interface, clear any in-bound checksum flags to 2090 * prevent them from being misused as out-bound flags. 2091 */ 2092 mc->m_pkthdr.csum_flags = 0; 2093 2094 ACQUIRE_GLOBAL_LOCKS(); 2095 bridge_enqueue(sc, dst_if, mc, 1); 2096 RELEASE_GLOBAL_LOCKS(); 2097 } 2098 2099 if (bmcast) { 2100 mc = m_copypacket(m, M_DONTWAIT); 2101 if (mc == NULL) { 2102 sc->sc_if.if_oerrors++; 2103 goto next; 2104 } 2105 2106 m_set_rcvif(mc, dst_if); 2107 mc->m_flags &= ~M_PROMISC; 2108 2109 ACQUIRE_GLOBAL_LOCKS(); 2110 ether_input(dst_if, mc); 2111 RELEASE_GLOBAL_LOCKS(); 2112 } 2113 next: 2114 BRIDGE_PSZ_RENTER(s); 2115 bridge_release_member(sc, bif, &psref); 2116 } 2117 BRIDGE_PSZ_REXIT(s); 2118 2119 m_freem(m); 2120 } 2121 2122 static int 2123 bridge_rtalloc(struct bridge_softc *sc, const uint8_t *dst, 2124 struct bridge_rtnode **brtp) 2125 { 2126 struct bridge_rtnode *brt; 2127 int error; 2128 2129 if (sc->sc_brtcnt >= sc->sc_brtmax) 2130 return ENOSPC; 2131 2132 /* 2133 * Allocate a new bridge forwarding node, and 2134 * initialize the expiration time and Ethernet 2135 * address. 2136 */ 2137 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 2138 if (brt == NULL) 2139 return ENOMEM; 2140 2141 memset(brt, 0, sizeof(*brt)); 2142 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2143 brt->brt_flags = IFBAF_DYNAMIC; 2144 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2145 PSLIST_ENTRY_INIT(brt, brt_list); 2146 PSLIST_ENTRY_INIT(brt, brt_hash); 2147 2148 BRIDGE_RT_LOCK(sc); 2149 error = bridge_rtnode_insert(sc, brt); 2150 BRIDGE_RT_UNLOCK(sc); 2151 2152 if (error != 0) { 2153 pool_put(&bridge_rtnode_pool, brt); 2154 return error; 2155 } 2156 2157 *brtp = brt; 2158 return 0; 2159 } 2160 2161 /* 2162 * bridge_rtupdate: 2163 * 2164 * Add a bridge routing entry. 2165 */ 2166 static int 2167 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 2168 struct ifnet *dst_if, int setflags, uint8_t flags) 2169 { 2170 struct bridge_rtnode *brt; 2171 int s; 2172 2173 again: 2174 /* 2175 * A route for this destination might already exist. If so, 2176 * update it, otherwise create a new one. 2177 */ 2178 BRIDGE_RT_RENTER(s); 2179 brt = bridge_rtnode_lookup(sc, dst); 2180 2181 if (brt != NULL) { 2182 brt->brt_ifp = dst_if; 2183 if (setflags) { 2184 brt->brt_flags = flags; 2185 if (flags & IFBAF_STATIC) 2186 brt->brt_expire = 0; 2187 else 2188 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2189 } else { 2190 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2191 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2192 } 2193 } 2194 BRIDGE_RT_REXIT(s); 2195 2196 if (brt == NULL) { 2197 int r; 2198 2199 r = bridge_rtalloc(sc, dst, &brt); 2200 if (r != 0) 2201 return r; 2202 goto again; 2203 } 2204 2205 return 0; 2206 } 2207 2208 /* 2209 * bridge_rtlookup: 2210 * 2211 * Lookup the destination interface for an address. 2212 */ 2213 static struct ifnet * 2214 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2215 { 2216 struct bridge_rtnode *brt; 2217 struct ifnet *ifs = NULL; 2218 int s; 2219 2220 BRIDGE_RT_RENTER(s); 2221 brt = bridge_rtnode_lookup(sc, addr); 2222 if (brt != NULL) 2223 ifs = brt->brt_ifp; 2224 BRIDGE_RT_REXIT(s); 2225 2226 return ifs; 2227 } 2228 2229 typedef bool (*bridge_iterate_cb_t) 2230 (struct bridge_softc *, struct bridge_rtnode *, bool *, void *); 2231 2232 /* 2233 * bridge_rtlist_iterate_remove: 2234 * 2235 * It iterates on sc->sc_rtlist and removes rtnodes of it which func 2236 * callback judges to remove. Removals of rtnodes are done in a manner 2237 * of pserialize. To this end, all kmem_* operations are placed out of 2238 * mutexes. 2239 */ 2240 static void 2241 bridge_rtlist_iterate_remove(struct bridge_softc *sc, bridge_iterate_cb_t func, void *arg) 2242 { 2243 struct bridge_rtnode *brt; 2244 struct bridge_rtnode **brt_list; 2245 int i, count; 2246 2247 retry: 2248 count = sc->sc_brtcnt; 2249 if (count == 0) 2250 return; 2251 brt_list = kmem_alloc(sizeof(*brt_list) * count, KM_SLEEP); 2252 2253 BRIDGE_RT_LOCK(sc); 2254 if (__predict_false(sc->sc_brtcnt > count)) { 2255 /* The rtnodes increased, we need more memory */ 2256 BRIDGE_RT_UNLOCK(sc); 2257 kmem_free(brt_list, sizeof(*brt_list) * count); 2258 goto retry; 2259 } 2260 2261 i = 0; 2262 /* 2263 * We don't need to use a _SAFE variant here because we know 2264 * that a removed item keeps its next pointer as-is thanks to 2265 * pslist(9) and isn't freed in the loop. 2266 */ 2267 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 2268 bool need_break = false; 2269 if (func(sc, brt, &need_break, arg)) { 2270 bridge_rtnode_remove(sc, brt); 2271 brt_list[i++] = brt; 2272 } 2273 if (need_break) 2274 break; 2275 } 2276 2277 if (i > 0) 2278 BRIDGE_RT_PSZ_PERFORM(sc); 2279 BRIDGE_RT_UNLOCK(sc); 2280 2281 while (--i >= 0) 2282 bridge_rtnode_destroy(brt_list[i]); 2283 2284 kmem_free(brt_list, sizeof(*brt_list) * count); 2285 } 2286 2287 static bool 2288 bridge_rttrim0_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2289 bool *need_break, void *arg) 2290 { 2291 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2292 /* Take into account of the subsequent removal */ 2293 if ((sc->sc_brtcnt - 1) <= sc->sc_brtmax) 2294 *need_break = true; 2295 return true; 2296 } else 2297 return false; 2298 } 2299 2300 static void 2301 bridge_rttrim0(struct bridge_softc *sc) 2302 { 2303 bridge_rtlist_iterate_remove(sc, bridge_rttrim0_cb, NULL); 2304 } 2305 2306 /* 2307 * bridge_rttrim: 2308 * 2309 * Trim the routine table so that we have a number 2310 * of routing entries less than or equal to the 2311 * maximum number. 2312 */ 2313 static void 2314 bridge_rttrim(struct bridge_softc *sc) 2315 { 2316 2317 /* Make sure we actually need to do this. */ 2318 if (sc->sc_brtcnt <= sc->sc_brtmax) 2319 return; 2320 2321 /* Force an aging cycle; this might trim enough addresses. */ 2322 bridge_rtage(sc); 2323 if (sc->sc_brtcnt <= sc->sc_brtmax) 2324 return; 2325 2326 bridge_rttrim0(sc); 2327 2328 return; 2329 } 2330 2331 /* 2332 * bridge_timer: 2333 * 2334 * Aging timer for the bridge. 2335 */ 2336 static void 2337 bridge_timer(void *arg) 2338 { 2339 struct bridge_softc *sc = arg; 2340 2341 workqueue_enqueue(sc->sc_rtage_wq, &sc->sc_rtage_wk, NULL); 2342 } 2343 2344 static void 2345 bridge_rtage_work(struct work *wk, void *arg) 2346 { 2347 struct bridge_softc *sc = arg; 2348 2349 KASSERT(wk == &sc->sc_rtage_wk); 2350 2351 bridge_rtage(sc); 2352 2353 if (sc->sc_if.if_flags & IFF_RUNNING) 2354 callout_reset(&sc->sc_brcallout, 2355 bridge_rtable_prune_period * hz, bridge_timer, sc); 2356 } 2357 2358 static bool 2359 bridge_rtage_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2360 bool *need_break, void *arg) 2361 { 2362 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2363 time_uptime >= brt->brt_expire) 2364 return true; 2365 else 2366 return false; 2367 } 2368 2369 /* 2370 * bridge_rtage: 2371 * 2372 * Perform an aging cycle. 2373 */ 2374 static void 2375 bridge_rtage(struct bridge_softc *sc) 2376 { 2377 bridge_rtlist_iterate_remove(sc, bridge_rtage_cb, NULL); 2378 } 2379 2380 2381 static bool 2382 bridge_rtflush_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2383 bool *need_break, void *arg) 2384 { 2385 int full = *(int*)arg; 2386 2387 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2388 return true; 2389 else 2390 return false; 2391 } 2392 2393 /* 2394 * bridge_rtflush: 2395 * 2396 * Remove all dynamic addresses from the bridge. 2397 */ 2398 static void 2399 bridge_rtflush(struct bridge_softc *sc, int full) 2400 { 2401 bridge_rtlist_iterate_remove(sc, bridge_rtflush_cb, &full); 2402 } 2403 2404 /* 2405 * bridge_rtdaddr: 2406 * 2407 * Remove an address from the table. 2408 */ 2409 static int 2410 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2411 { 2412 struct bridge_rtnode *brt; 2413 2414 BRIDGE_RT_LOCK(sc); 2415 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2416 BRIDGE_RT_UNLOCK(sc); 2417 return ENOENT; 2418 } 2419 bridge_rtnode_remove(sc, brt); 2420 BRIDGE_RT_PSZ_PERFORM(sc); 2421 BRIDGE_RT_UNLOCK(sc); 2422 2423 bridge_rtnode_destroy(brt); 2424 2425 return 0; 2426 } 2427 2428 /* 2429 * bridge_rtdelete: 2430 * 2431 * Delete routes to a speicifc member interface. 2432 */ 2433 static void 2434 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2435 { 2436 struct bridge_rtnode *brt; 2437 2438 /* XXX pserialize_perform for each entry is slow */ 2439 again: 2440 BRIDGE_RT_LOCK(sc); 2441 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 2442 if (brt->brt_ifp == ifp) 2443 break; 2444 } 2445 if (brt == NULL) { 2446 BRIDGE_RT_UNLOCK(sc); 2447 return; 2448 } 2449 bridge_rtnode_remove(sc, brt); 2450 BRIDGE_RT_PSZ_PERFORM(sc); 2451 BRIDGE_RT_UNLOCK(sc); 2452 2453 bridge_rtnode_destroy(brt); 2454 2455 goto again; 2456 } 2457 2458 /* 2459 * bridge_rtable_init: 2460 * 2461 * Initialize the route table for this bridge. 2462 */ 2463 static void 2464 bridge_rtable_init(struct bridge_softc *sc) 2465 { 2466 int i; 2467 2468 sc->sc_rthash = kmem_alloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2469 KM_SLEEP); 2470 2471 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2472 PSLIST_INIT(&sc->sc_rthash[i]); 2473 2474 sc->sc_rthash_key = cprng_fast32(); 2475 2476 PSLIST_INIT(&sc->sc_rtlist); 2477 2478 sc->sc_rtlist_psz = pserialize_create(); 2479 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 2480 } 2481 2482 /* 2483 * bridge_rtable_fini: 2484 * 2485 * Deconstruct the route table for this bridge. 2486 */ 2487 static void 2488 bridge_rtable_fini(struct bridge_softc *sc) 2489 { 2490 2491 kmem_free(sc->sc_rthash, sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE); 2492 mutex_obj_free(sc->sc_rtlist_lock); 2493 pserialize_destroy(sc->sc_rtlist_psz); 2494 } 2495 2496 /* 2497 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2498 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2499 */ 2500 #define mix(a, b, c) \ 2501 do { \ 2502 a -= b; a -= c; a ^= (c >> 13); \ 2503 b -= c; b -= a; b ^= (a << 8); \ 2504 c -= a; c -= b; c ^= (b >> 13); \ 2505 a -= b; a -= c; a ^= (c >> 12); \ 2506 b -= c; b -= a; b ^= (a << 16); \ 2507 c -= a; c -= b; c ^= (b >> 5); \ 2508 a -= b; a -= c; a ^= (c >> 3); \ 2509 b -= c; b -= a; b ^= (a << 10); \ 2510 c -= a; c -= b; c ^= (b >> 15); \ 2511 } while (/*CONSTCOND*/0) 2512 2513 static inline uint32_t 2514 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2515 { 2516 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2517 2518 b += addr[5] << 8; 2519 b += addr[4]; 2520 a += (uint32_t)addr[3] << 24; 2521 a += addr[2] << 16; 2522 a += addr[1] << 8; 2523 a += addr[0]; 2524 2525 mix(a, b, c); 2526 2527 return (c & BRIDGE_RTHASH_MASK); 2528 } 2529 2530 #undef mix 2531 2532 /* 2533 * bridge_rtnode_lookup: 2534 * 2535 * Look up a bridge route node for the specified destination. 2536 */ 2537 static struct bridge_rtnode * 2538 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2539 { 2540 struct bridge_rtnode *brt; 2541 uint32_t hash; 2542 int dir; 2543 2544 hash = bridge_rthash(sc, addr); 2545 BRIDGE_RTHASH_READER_FOREACH(brt, sc, hash) { 2546 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2547 if (dir == 0) 2548 return brt; 2549 if (dir > 0) 2550 return NULL; 2551 } 2552 2553 return NULL; 2554 } 2555 2556 /* 2557 * bridge_rtnode_insert: 2558 * 2559 * Insert the specified bridge node into the route table. We 2560 * assume the entry is not already in the table. 2561 */ 2562 static int 2563 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2564 { 2565 struct bridge_rtnode *lbrt, *prev = NULL; 2566 uint32_t hash; 2567 2568 KASSERT(BRIDGE_RT_LOCKED(sc)); 2569 2570 hash = bridge_rthash(sc, brt->brt_addr); 2571 BRIDGE_RTHASH_WRITER_FOREACH(lbrt, sc, hash) { 2572 int dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2573 if (dir == 0) 2574 return EEXIST; 2575 if (dir > 0) 2576 break; 2577 prev = lbrt; 2578 } 2579 if (prev == NULL) 2580 BRIDGE_RTHASH_WRITER_INSERT_HEAD(sc, hash, brt); 2581 else 2582 BRIDGE_RTHASH_WRITER_INSERT_AFTER(prev, brt); 2583 2584 BRIDGE_RTLIST_WRITER_INSERT_HEAD(sc, brt); 2585 sc->sc_brtcnt++; 2586 2587 return 0; 2588 } 2589 2590 /* 2591 * bridge_rtnode_remove: 2592 * 2593 * Remove a bridge rtnode from the rthash and the rtlist of a bridge. 2594 */ 2595 static void 2596 bridge_rtnode_remove(struct bridge_softc *sc, struct bridge_rtnode *brt) 2597 { 2598 2599 KASSERT(BRIDGE_RT_LOCKED(sc)); 2600 2601 BRIDGE_RTHASH_WRITER_REMOVE(brt); 2602 BRIDGE_RTLIST_WRITER_REMOVE(brt); 2603 sc->sc_brtcnt--; 2604 } 2605 2606 /* 2607 * bridge_rtnode_destroy: 2608 * 2609 * Destroy a bridge rtnode. 2610 */ 2611 static void 2612 bridge_rtnode_destroy(struct bridge_rtnode *brt) 2613 { 2614 2615 PSLIST_ENTRY_DESTROY(brt, brt_list); 2616 PSLIST_ENTRY_DESTROY(brt, brt_hash); 2617 pool_put(&bridge_rtnode_pool, brt); 2618 } 2619 2620 #if defined(BRIDGE_IPF) 2621 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2622 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2623 2624 /* 2625 * Send bridge packets through IPF if they are one of the types IPF can deal 2626 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2627 * question.) 2628 */ 2629 static int 2630 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2631 { 2632 int snap, error; 2633 struct ether_header *eh1, eh2; 2634 struct llc llc1; 2635 uint16_t ether_type; 2636 2637 snap = 0; 2638 error = -1; /* Default error if not error == 0 */ 2639 eh1 = mtod(*mp, struct ether_header *); 2640 ether_type = ntohs(eh1->ether_type); 2641 2642 /* 2643 * Check for SNAP/LLC. 2644 */ 2645 if (ether_type < ETHERMTU) { 2646 struct llc *llc2 = (struct llc *)(eh1 + 1); 2647 2648 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2649 llc2->llc_dsap == LLC_SNAP_LSAP && 2650 llc2->llc_ssap == LLC_SNAP_LSAP && 2651 llc2->llc_control == LLC_UI) { 2652 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2653 snap = 1; 2654 } 2655 } 2656 2657 /* 2658 * If we're trying to filter bridge traffic, don't look at anything 2659 * other than IP and ARP traffic. If the filter doesn't understand 2660 * IPv6, don't allow IPv6 through the bridge either. This is lame 2661 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2662 * but of course we don't have an AppleTalk filter to begin with. 2663 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2664 * ARP traffic.) 2665 */ 2666 switch (ether_type) { 2667 case ETHERTYPE_ARP: 2668 case ETHERTYPE_REVARP: 2669 return 0; /* Automatically pass */ 2670 case ETHERTYPE_IP: 2671 # ifdef INET6 2672 case ETHERTYPE_IPV6: 2673 # endif /* INET6 */ 2674 break; 2675 default: 2676 goto bad; 2677 } 2678 2679 /* Strip off the Ethernet header and keep a copy. */ 2680 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2681 m_adj(*mp, ETHER_HDR_LEN); 2682 2683 /* Strip off snap header, if present */ 2684 if (snap) { 2685 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2686 m_adj(*mp, sizeof(struct llc)); 2687 } 2688 2689 /* 2690 * Check basic packet sanity and run IPF through pfil. 2691 */ 2692 KASSERT(!cpu_intr_p()); 2693 switch (ether_type) 2694 { 2695 case ETHERTYPE_IP : 2696 error = bridge_ip_checkbasic(mp); 2697 if (error == 0) 2698 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2699 break; 2700 # ifdef INET6 2701 case ETHERTYPE_IPV6 : 2702 error = bridge_ip6_checkbasic(mp); 2703 if (error == 0) 2704 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2705 break; 2706 # endif 2707 default : 2708 error = 0; 2709 break; 2710 } 2711 2712 if (*mp == NULL) 2713 return error; 2714 if (error != 0) 2715 goto bad; 2716 2717 error = -1; 2718 2719 /* 2720 * Finally, put everything back the way it was and return 2721 */ 2722 if (snap) { 2723 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2724 if (*mp == NULL) 2725 return error; 2726 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2727 } 2728 2729 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2730 if (*mp == NULL) 2731 return error; 2732 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2733 2734 return 0; 2735 2736 bad: 2737 m_freem(*mp); 2738 *mp = NULL; 2739 return error; 2740 } 2741 2742 /* 2743 * Perform basic checks on header size since 2744 * IPF assumes ip_input has already processed 2745 * it for it. Cut-and-pasted from ip_input.c. 2746 * Given how simple the IPv6 version is, 2747 * does the IPv4 version really need to be 2748 * this complicated? 2749 * 2750 * XXX Should we update ipstat here, or not? 2751 * XXX Right now we update ipstat but not 2752 * XXX csum_counter. 2753 */ 2754 static int 2755 bridge_ip_checkbasic(struct mbuf **mp) 2756 { 2757 struct mbuf *m = *mp; 2758 struct ip *ip; 2759 int len, hlen; 2760 2761 if (*mp == NULL) 2762 return -1; 2763 2764 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2765 if ((m = m_copyup(m, sizeof(struct ip), 2766 (max_linkhdr + 3) & ~3)) == NULL) { 2767 /* XXXJRT new stat, please */ 2768 ip_statinc(IP_STAT_TOOSMALL); 2769 goto bad; 2770 } 2771 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2772 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2773 ip_statinc(IP_STAT_TOOSMALL); 2774 goto bad; 2775 } 2776 } 2777 ip = mtod(m, struct ip *); 2778 if (ip == NULL) goto bad; 2779 2780 if (ip->ip_v != IPVERSION) { 2781 ip_statinc(IP_STAT_BADVERS); 2782 goto bad; 2783 } 2784 hlen = ip->ip_hl << 2; 2785 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2786 ip_statinc(IP_STAT_BADHLEN); 2787 goto bad; 2788 } 2789 if (hlen > m->m_len) { 2790 if ((m = m_pullup(m, hlen)) == 0) { 2791 ip_statinc(IP_STAT_BADHLEN); 2792 goto bad; 2793 } 2794 ip = mtod(m, struct ip *); 2795 if (ip == NULL) goto bad; 2796 } 2797 2798 switch (m->m_pkthdr.csum_flags & 2799 ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_IPv4) | 2800 M_CSUM_IPv4_BAD)) { 2801 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2802 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2803 goto bad; 2804 2805 case M_CSUM_IPv4: 2806 /* Checksum was okay. */ 2807 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2808 break; 2809 2810 default: 2811 /* Must compute it ourselves. */ 2812 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2813 if (in_cksum(m, hlen) != 0) 2814 goto bad; 2815 break; 2816 } 2817 2818 /* Retrieve the packet length. */ 2819 len = ntohs(ip->ip_len); 2820 2821 /* 2822 * Check for additional length bogosity 2823 */ 2824 if (len < hlen) { 2825 ip_statinc(IP_STAT_BADLEN); 2826 goto bad; 2827 } 2828 2829 /* 2830 * Check that the amount of data in the buffers 2831 * is as at least much as the IP header would have us expect. 2832 * Drop packet if shorter than we expect. 2833 */ 2834 if (m->m_pkthdr.len < len) { 2835 ip_statinc(IP_STAT_TOOSHORT); 2836 goto bad; 2837 } 2838 2839 /* Checks out, proceed */ 2840 *mp = m; 2841 return 0; 2842 2843 bad: 2844 *mp = m; 2845 return -1; 2846 } 2847 2848 # ifdef INET6 2849 /* 2850 * Same as above, but for IPv6. 2851 * Cut-and-pasted from ip6_input.c. 2852 * XXX Should we update ip6stat, or not? 2853 */ 2854 static int 2855 bridge_ip6_checkbasic(struct mbuf **mp) 2856 { 2857 struct mbuf *m = *mp; 2858 struct ip6_hdr *ip6; 2859 2860 /* 2861 * If the IPv6 header is not aligned, slurp it up into a new 2862 * mbuf with space for link headers, in the event we forward 2863 * it. Otherwise, if it is aligned, make sure the entire base 2864 * IPv6 header is in the first mbuf of the chain. 2865 */ 2866 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2867 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2868 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2869 (max_linkhdr + 3) & ~3)) == NULL) { 2870 /* XXXJRT new stat, please */ 2871 ip6_statinc(IP6_STAT_TOOSMALL); 2872 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2873 goto bad; 2874 } 2875 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2876 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2877 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2878 ip6_statinc(IP6_STAT_TOOSMALL); 2879 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2880 goto bad; 2881 } 2882 } 2883 2884 ip6 = mtod(m, struct ip6_hdr *); 2885 2886 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2887 ip6_statinc(IP6_STAT_BADVERS); 2888 in6_ifstat_inc(m_get_rcvif_NOMPSAFE(m), ifs6_in_hdrerr); 2889 goto bad; 2890 } 2891 2892 /* Checks out, proceed */ 2893 *mp = m; 2894 return 0; 2895 2896 bad: 2897 *mp = m; 2898 return -1; 2899 } 2900 # endif /* INET6 */ 2901 #endif /* BRIDGE_IPF */ 2902
Indexes created Thu Oct 02 14:10:14 GMT 2025