if_bridge.c revision 1.164.4.1
1 /* $NetBSD: if_bridge.c,v 1.164.4.1 2020/02/27 18:34:12 martin 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 1.164.4.1 2020/02/27 18:34:12 martin 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 } 793 794 static int 795 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 796 { 797 struct ifbreq *req = arg; 798 struct bridge_iflist *bif = NULL; 799 struct ifnet *ifs; 800 int error = 0; 801 struct psref psref; 802 803 ifs = if_get(req->ifbr_ifsname, &psref); 804 if (ifs == NULL) 805 return ENOENT; 806 807 if (ifs->if_bridge == sc) { 808 error = EEXIST; 809 goto out; 810 } 811 812 if (ifs->if_bridge != NULL) { 813 error = EBUSY; 814 goto out; 815 } 816 817 if (ifs->_if_input != ether_input) { 818 error = EINVAL; 819 goto out; 820 } 821 822 /* FIXME: doesn't work with non-IFF_SIMPLEX interfaces */ 823 if ((ifs->if_flags & IFF_SIMPLEX) == 0) { 824 error = EINVAL; 825 goto out; 826 } 827 828 bif = kmem_alloc(sizeof(*bif), KM_SLEEP); 829 830 switch (ifs->if_type) { 831 case IFT_ETHER: 832 if (sc->sc_if.if_mtu != ifs->if_mtu) { 833 error = EINVAL; 834 goto out; 835 } 836 /* FALLTHROUGH */ 837 case IFT_L2TP: 838 IFNET_LOCK(ifs); 839 error = ether_enable_vlan_mtu(ifs); 840 IFNET_UNLOCK(ifs); 841 if (error > 0) 842 goto out; 843 /* 844 * Place the interface into promiscuous mode. 845 */ 846 error = ifpromisc(ifs, 1); 847 if (error) 848 goto out; 849 break; 850 default: 851 error = EINVAL; 852 goto out; 853 } 854 855 bif->bif_ifp = ifs; 856 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 857 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 858 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 859 PSLIST_ENTRY_INIT(bif, bif_next); 860 psref_target_init(&bif->bif_psref, bridge_psref_class); 861 862 BRIDGE_LOCK(sc); 863 864 ifs->if_bridge = sc; 865 ifs->if_bridgeif = bif; 866 PSLIST_WRITER_INSERT_HEAD(&sc->sc_iflist_psref.bip_iflist, bif, bif_next); 867 ifs->_if_input = bridge_input; 868 869 BRIDGE_UNLOCK(sc); 870 871 bridge_calc_csum_flags(sc); 872 873 if (sc->sc_if.if_flags & IFF_RUNNING) 874 bstp_initialization(sc); 875 else 876 bstp_stop(sc); 877 878 out: 879 if_put(ifs, &psref); 880 if (error) { 881 if (bif != NULL) 882 kmem_free(bif, sizeof(*bif)); 883 } 884 return error; 885 } 886 887 static int 888 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 889 { 890 struct ifbreq *req = arg; 891 const char *name = req->ifbr_ifsname; 892 struct bridge_iflist *bif; 893 struct ifnet *ifs; 894 895 BRIDGE_LOCK(sc); 896 897 /* 898 * Don't use bridge_lookup_member. We want to get a member 899 * with bif_refs == 0. 900 */ 901 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 902 ifs = bif->bif_ifp; 903 if (strcmp(ifs->if_xname, name) == 0) 904 break; 905 } 906 907 if (bif == NULL) { 908 BRIDGE_UNLOCK(sc); 909 return ENOENT; 910 } 911 912 bridge_delete_member(sc, bif); 913 914 BRIDGE_UNLOCK(sc); 915 916 bridge_rtdelete(sc, ifs); 917 bridge_calc_csum_flags(sc); 918 919 if (sc->sc_if.if_flags & IFF_RUNNING) 920 bstp_initialization(sc); 921 922 return 0; 923 } 924 925 static int 926 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 927 { 928 struct ifbreq *req = arg; 929 struct bridge_iflist *bif; 930 struct psref psref; 931 932 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 933 if (bif == NULL) 934 return ENOENT; 935 936 req->ifbr_ifsflags = bif->bif_flags; 937 req->ifbr_state = bif->bif_state; 938 req->ifbr_priority = bif->bif_priority; 939 req->ifbr_path_cost = bif->bif_path_cost; 940 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 941 942 bridge_release_member(sc, bif, &psref); 943 944 return 0; 945 } 946 947 static int 948 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 949 { 950 struct ifbreq *req = arg; 951 struct bridge_iflist *bif; 952 struct psref psref; 953 954 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 955 if (bif == NULL) 956 return ENOENT; 957 958 if (req->ifbr_ifsflags & IFBIF_STP) { 959 switch (bif->bif_ifp->if_type) { 960 case IFT_ETHER: 961 case IFT_L2TP: 962 /* These can do spanning tree. */ 963 break; 964 965 default: 966 /* Nothing else can. */ 967 bridge_release_member(sc, bif, &psref); 968 return EINVAL; 969 } 970 } 971 972 bif->bif_flags = req->ifbr_ifsflags; 973 974 bridge_release_member(sc, bif, &psref); 975 976 if (sc->sc_if.if_flags & IFF_RUNNING) 977 bstp_initialization(sc); 978 979 return 0; 980 } 981 982 static int 983 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 984 { 985 struct ifbrparam *param = arg; 986 987 sc->sc_brtmax = param->ifbrp_csize; 988 bridge_rttrim(sc); 989 990 return 0; 991 } 992 993 static int 994 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 995 { 996 struct ifbrparam *param = arg; 997 998 param->ifbrp_csize = sc->sc_brtmax; 999 1000 return 0; 1001 } 1002 1003 static int 1004 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1005 { 1006 struct ifbifconf *bifc = arg; 1007 struct bridge_iflist *bif; 1008 struct ifbreq *breqs; 1009 int i, count, error = 0; 1010 1011 retry: 1012 BRIDGE_LOCK(sc); 1013 count = 0; 1014 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 1015 count++; 1016 BRIDGE_UNLOCK(sc); 1017 1018 if (count == 0) { 1019 bifc->ifbic_len = 0; 1020 return 0; 1021 } 1022 1023 if (bifc->ifbic_len == 0 || bifc->ifbic_len < (sizeof(*breqs) * count)) { 1024 /* Tell that a larger buffer is needed */ 1025 bifc->ifbic_len = sizeof(*breqs) * count; 1026 return 0; 1027 } 1028 1029 breqs = kmem_alloc(sizeof(*breqs) * count, KM_SLEEP); 1030 1031 BRIDGE_LOCK(sc); 1032 1033 i = 0; 1034 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 1035 i++; 1036 if (i > count) { 1037 /* 1038 * The number of members has been increased. 1039 * We need more memory! 1040 */ 1041 BRIDGE_UNLOCK(sc); 1042 kmem_free(breqs, sizeof(*breqs) * count); 1043 goto retry; 1044 } 1045 1046 i = 0; 1047 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 1048 struct ifbreq *breq = &breqs[i++]; 1049 memset(breq, 0, sizeof(*breq)); 1050 1051 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, 1052 sizeof(breq->ifbr_ifsname)); 1053 breq->ifbr_ifsflags = bif->bif_flags; 1054 breq->ifbr_state = bif->bif_state; 1055 breq->ifbr_priority = bif->bif_priority; 1056 breq->ifbr_path_cost = bif->bif_path_cost; 1057 breq->ifbr_portno = bif->bif_ifp->if_index & 0xff; 1058 } 1059 1060 /* Don't call copyout with holding the mutex */ 1061 BRIDGE_UNLOCK(sc); 1062 1063 for (i = 0; i < count; i++) { 1064 error = copyout(&breqs[i], bifc->ifbic_req + i, sizeof(*breqs)); 1065 if (error) 1066 break; 1067 } 1068 bifc->ifbic_len = sizeof(*breqs) * i; 1069 1070 kmem_free(breqs, sizeof(*breqs) * count); 1071 1072 return error; 1073 } 1074 1075 static int 1076 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1077 { 1078 struct ifbaconf *bac = arg; 1079 struct bridge_rtnode *brt; 1080 struct ifbareq bareq; 1081 int count = 0, error = 0, len; 1082 1083 if (bac->ifbac_len == 0) 1084 return 0; 1085 1086 BRIDGE_RT_LOCK(sc); 1087 1088 /* The passed buffer is not enough, tell a required size. */ 1089 if (bac->ifbac_len < (sizeof(bareq) * sc->sc_brtcnt)) { 1090 count = sc->sc_brtcnt; 1091 goto out; 1092 } 1093 1094 len = bac->ifbac_len; 1095 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 1096 if (len < sizeof(bareq)) 1097 goto out; 1098 memset(&bareq, 0, sizeof(bareq)); 1099 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1100 sizeof(bareq.ifba_ifsname)); 1101 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1102 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1103 bareq.ifba_expire = brt->brt_expire - time_uptime; 1104 } else 1105 bareq.ifba_expire = 0; 1106 bareq.ifba_flags = brt->brt_flags; 1107 1108 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1109 if (error) 1110 goto out; 1111 count++; 1112 len -= sizeof(bareq); 1113 } 1114 out: 1115 BRIDGE_RT_UNLOCK(sc); 1116 1117 bac->ifbac_len = sizeof(bareq) * count; 1118 return error; 1119 } 1120 1121 static int 1122 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1123 { 1124 struct ifbareq *req = arg; 1125 struct bridge_iflist *bif; 1126 int error; 1127 struct psref psref; 1128 1129 bif = bridge_lookup_member(sc, req->ifba_ifsname, &psref); 1130 if (bif == NULL) 1131 return ENOENT; 1132 1133 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1134 req->ifba_flags); 1135 1136 bridge_release_member(sc, bif, &psref); 1137 1138 return error; 1139 } 1140 1141 static int 1142 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1143 { 1144 struct ifbrparam *param = arg; 1145 1146 sc->sc_brttimeout = param->ifbrp_ctime; 1147 1148 return 0; 1149 } 1150 1151 static int 1152 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1153 { 1154 struct ifbrparam *param = arg; 1155 1156 param->ifbrp_ctime = sc->sc_brttimeout; 1157 1158 return 0; 1159 } 1160 1161 static int 1162 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1163 { 1164 struct ifbareq *req = arg; 1165 1166 return (bridge_rtdaddr(sc, req->ifba_dst)); 1167 } 1168 1169 static int 1170 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1171 { 1172 struct ifbreq *req = arg; 1173 1174 bridge_rtflush(sc, req->ifbr_ifsflags); 1175 1176 return 0; 1177 } 1178 1179 static int 1180 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1181 { 1182 struct ifbrparam *param = arg; 1183 1184 param->ifbrp_prio = sc->sc_bridge_priority; 1185 1186 return 0; 1187 } 1188 1189 static int 1190 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1191 { 1192 struct ifbrparam *param = arg; 1193 1194 sc->sc_bridge_priority = param->ifbrp_prio; 1195 1196 if (sc->sc_if.if_flags & IFF_RUNNING) 1197 bstp_initialization(sc); 1198 1199 return 0; 1200 } 1201 1202 static int 1203 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1204 { 1205 struct ifbrparam *param = arg; 1206 1207 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1208 1209 return 0; 1210 } 1211 1212 static int 1213 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1214 { 1215 struct ifbrparam *param = arg; 1216 1217 if (param->ifbrp_hellotime == 0) 1218 return EINVAL; 1219 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1220 1221 if (sc->sc_if.if_flags & IFF_RUNNING) 1222 bstp_initialization(sc); 1223 1224 return 0; 1225 } 1226 1227 static int 1228 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1229 { 1230 struct ifbrparam *param = arg; 1231 1232 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1233 1234 return 0; 1235 } 1236 1237 static int 1238 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1239 { 1240 struct ifbrparam *param = arg; 1241 1242 if (param->ifbrp_fwddelay == 0) 1243 return EINVAL; 1244 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1245 1246 if (sc->sc_if.if_flags & IFF_RUNNING) 1247 bstp_initialization(sc); 1248 1249 return 0; 1250 } 1251 1252 static int 1253 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1254 { 1255 struct ifbrparam *param = arg; 1256 1257 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1258 1259 return 0; 1260 } 1261 1262 static int 1263 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1264 { 1265 struct ifbrparam *param = arg; 1266 1267 if (param->ifbrp_maxage == 0) 1268 return EINVAL; 1269 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1270 1271 if (sc->sc_if.if_flags & IFF_RUNNING) 1272 bstp_initialization(sc); 1273 1274 return 0; 1275 } 1276 1277 static int 1278 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1279 { 1280 struct ifbreq *req = arg; 1281 struct bridge_iflist *bif; 1282 struct psref psref; 1283 1284 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1285 if (bif == NULL) 1286 return ENOENT; 1287 1288 bif->bif_priority = req->ifbr_priority; 1289 1290 if (sc->sc_if.if_flags & IFF_RUNNING) 1291 bstp_initialization(sc); 1292 1293 bridge_release_member(sc, bif, &psref); 1294 1295 return 0; 1296 } 1297 1298 #if defined(BRIDGE_IPF) 1299 static int 1300 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1301 { 1302 struct ifbrparam *param = arg; 1303 1304 param->ifbrp_filter = sc->sc_filter_flags; 1305 1306 return 0; 1307 } 1308 1309 static int 1310 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1311 { 1312 struct ifbrparam *param = arg; 1313 uint32_t nflags, oflags; 1314 1315 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1316 return EINVAL; 1317 1318 nflags = param->ifbrp_filter; 1319 oflags = sc->sc_filter_flags; 1320 1321 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1322 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1323 sc->sc_if.if_pfil); 1324 } 1325 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1326 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1327 sc->sc_if.if_pfil); 1328 } 1329 1330 sc->sc_filter_flags = nflags; 1331 1332 return 0; 1333 } 1334 #endif /* BRIDGE_IPF */ 1335 1336 static int 1337 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1338 { 1339 struct ifbreq *req = arg; 1340 struct bridge_iflist *bif; 1341 struct psref psref; 1342 1343 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1344 if (bif == NULL) 1345 return ENOENT; 1346 1347 bif->bif_path_cost = req->ifbr_path_cost; 1348 1349 if (sc->sc_if.if_flags & IFF_RUNNING) 1350 bstp_initialization(sc); 1351 1352 bridge_release_member(sc, bif, &psref); 1353 1354 return 0; 1355 } 1356 1357 /* 1358 * bridge_ifdetach: 1359 * 1360 * Detach an interface from a bridge. Called when a member 1361 * interface is detaching. 1362 */ 1363 void 1364 bridge_ifdetach(struct ifnet *ifp) 1365 { 1366 struct bridge_softc *sc = ifp->if_bridge; 1367 struct ifbreq breq; 1368 1369 /* ioctl_lock should prevent this from happening */ 1370 KASSERT(sc != NULL); 1371 1372 memset(&breq, 0, sizeof(breq)); 1373 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1374 1375 (void) bridge_ioctl_del(sc, &breq); 1376 } 1377 1378 /* 1379 * bridge_init: 1380 * 1381 * Initialize a bridge interface. 1382 */ 1383 static int 1384 bridge_init(struct ifnet *ifp) 1385 { 1386 struct bridge_softc *sc = ifp->if_softc; 1387 1388 KASSERT((ifp->if_flags & IFF_RUNNING) == 0); 1389 1390 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1391 bridge_timer, sc); 1392 bstp_initialization(sc); 1393 1394 ifp->if_flags |= IFF_RUNNING; 1395 return 0; 1396 } 1397 1398 /* 1399 * bridge_stop: 1400 * 1401 * Stop the bridge interface. 1402 */ 1403 static void 1404 bridge_stop(struct ifnet *ifp, int disable) 1405 { 1406 struct bridge_softc *sc = ifp->if_softc; 1407 1408 KASSERT((ifp->if_flags & IFF_RUNNING) != 0); 1409 ifp->if_flags &= ~IFF_RUNNING; 1410 1411 callout_halt(&sc->sc_brcallout, NULL); 1412 workqueue_wait(sc->sc_rtage_wq, &sc->sc_rtage_wk); 1413 bstp_stop(sc); 1414 bridge_rtflush(sc, IFBF_FLUSHDYN); 1415 } 1416 1417 /* 1418 * bridge_enqueue: 1419 * 1420 * Enqueue a packet on a bridge member interface. 1421 */ 1422 void 1423 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1424 int runfilt) 1425 { 1426 int len, error; 1427 short mflags; 1428 1429 if (runfilt) { 1430 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1431 dst_ifp, PFIL_OUT) != 0) { 1432 if (m != NULL) 1433 m_freem(m); 1434 return; 1435 } 1436 if (m == NULL) 1437 return; 1438 } 1439 1440 #ifdef ALTQ 1441 KERNEL_LOCK(1, NULL); 1442 /* 1443 * If ALTQ is enabled on the member interface, do 1444 * classification; the queueing discipline might 1445 * not require classification, but might require 1446 * the address family/header pointer in the pktattr. 1447 */ 1448 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1449 /* XXX IFT_ETHER */ 1450 altq_etherclassify(&dst_ifp->if_snd, m); 1451 } 1452 KERNEL_UNLOCK_ONE(NULL); 1453 #endif /* ALTQ */ 1454 1455 len = m->m_pkthdr.len; 1456 mflags = m->m_flags; 1457 1458 error = if_transmit_lock(dst_ifp, m); 1459 if (error) { 1460 /* mbuf is already freed */ 1461 sc->sc_if.if_oerrors++; 1462 return; 1463 } 1464 1465 sc->sc_if.if_opackets++; 1466 sc->sc_if.if_obytes += len; 1467 if (mflags & M_MCAST) 1468 sc->sc_if.if_omcasts++; 1469 } 1470 1471 /* 1472 * bridge_output: 1473 * 1474 * Send output from a bridge member interface. This 1475 * performs the bridging function for locally originated 1476 * packets. 1477 * 1478 * The mbuf has the Ethernet header already attached. We must 1479 * enqueue or free the mbuf before returning. 1480 */ 1481 int 1482 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1483 const struct rtentry *rt) 1484 { 1485 struct ether_header *eh; 1486 struct ifnet *dst_if; 1487 struct bridge_softc *sc; 1488 struct mbuf *n; 1489 int s; 1490 1491 /* 1492 * bridge_output() is called from ether_output(), furthermore 1493 * ifp argument doesn't point to bridge(4). So, don't assert 1494 * IFEF_MPSAFE here. 1495 */ 1496 1497 if (m->m_len < ETHER_HDR_LEN) { 1498 m = m_pullup(m, ETHER_HDR_LEN); 1499 if (m == NULL) 1500 return 0; 1501 } 1502 1503 eh = mtod(m, struct ether_header *); 1504 sc = ifp->if_bridge; 1505 1506 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1507 if (memcmp(etherbroadcastaddr, 1508 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1509 m->m_flags |= M_BCAST; 1510 else 1511 m->m_flags |= M_MCAST; 1512 } 1513 1514 /* 1515 * If bridge is down, but the original output interface is up, 1516 * go ahead and send out that interface. Otherwise, the packet 1517 * is dropped below. 1518 */ 1519 if (__predict_false(sc == NULL) || 1520 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1521 dst_if = ifp; 1522 goto unicast_asis; 1523 } 1524 1525 /* 1526 * If the packet is a multicast, or we don't know a better way to 1527 * get there, send to all interfaces. 1528 */ 1529 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0) 1530 dst_if = NULL; 1531 else 1532 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1533 1534 /* 1535 * In general, we need to handle TX offload in software before 1536 * enqueueing a packet. However, we can send it as is in the 1537 * cases of unicast via (1) the source interface, or (2) an 1538 * interface which supports the specified offload options. 1539 * For multicast or broadcast, send it as is only if (3) all 1540 * the member interfaces support the specified options. 1541 */ 1542 1543 /* 1544 * Unicast via the source interface. 1545 */ 1546 if (dst_if == ifp) 1547 goto unicast_asis; 1548 1549 /* 1550 * Unicast via other interface. 1551 */ 1552 if (dst_if != NULL) { 1553 KASSERT(m->m_flags & M_PKTHDR); 1554 if (TX_OFFLOAD_SUPPORTED(dst_if->if_csum_flags_tx, 1555 m->m_pkthdr.csum_flags)) { 1556 /* 1557 * Unicast via an interface which supports the 1558 * specified offload options. 1559 */ 1560 goto unicast_asis; 1561 } 1562 1563 /* 1564 * Handle TX offload in software. For TSO, a packet is 1565 * split into multiple chunks. Thus, the return value of 1566 * ether_sw_offload_tx() is mbuf queue consists of them. 1567 */ 1568 m = ether_sw_offload_tx(ifp, m); 1569 if (m == NULL) 1570 return 0; 1571 1572 do { 1573 n = m->m_nextpkt; 1574 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1575 m_freem(m); 1576 else 1577 bridge_enqueue(sc, dst_if, m, 0); 1578 m = n; 1579 } while (m != NULL); 1580 1581 return 0; 1582 } 1583 1584 /* 1585 * Multicast or broadcast. 1586 */ 1587 if (TX_OFFLOAD_SUPPORTED(sc->sc_csum_flags_tx, 1588 m->m_pkthdr.csum_flags)) { 1589 /* 1590 * Specified TX offload options are supported by all 1591 * the member interfaces of this bridge. 1592 */ 1593 m->m_nextpkt = NULL; /* XXX */ 1594 } else { 1595 /* 1596 * Otherwise, handle TX offload in software. 1597 */ 1598 m = ether_sw_offload_tx(ifp, m); 1599 if (m == NULL) 1600 return 0; 1601 } 1602 1603 do { 1604 /* XXX Should call bridge_broadcast, but there are locking 1605 * issues which need resolving first. */ 1606 struct bridge_iflist *bif; 1607 struct mbuf *mc; 1608 bool used = false; 1609 1610 n = m->m_nextpkt; 1611 1612 BRIDGE_PSZ_RENTER(s); 1613 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1614 struct psref psref; 1615 1616 bridge_acquire_member(sc, bif, &psref); 1617 BRIDGE_PSZ_REXIT(s); 1618 1619 dst_if = bif->bif_ifp; 1620 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1621 goto next; 1622 1623 /* 1624 * If this is not the original output interface, 1625 * and the interface is participating in spanning 1626 * tree, make sure the port is in a state that 1627 * allows forwarding. 1628 */ 1629 if (dst_if != ifp && 1630 (bif->bif_flags & IFBIF_STP) != 0) { 1631 switch (bif->bif_state) { 1632 case BSTP_IFSTATE_BLOCKING: 1633 case BSTP_IFSTATE_LISTENING: 1634 case BSTP_IFSTATE_DISABLED: 1635 goto next; 1636 } 1637 } 1638 1639 if (PSLIST_READER_NEXT(bif, struct bridge_iflist, 1640 bif_next) == NULL && 1641 ((m->m_flags & (M_MCAST | M_BCAST)) == 0 || 1642 dst_if == ifp)) 1643 { 1644 used = true; 1645 mc = m; 1646 } else { 1647 mc = m_copypacket(m, M_DONTWAIT); 1648 if (mc == NULL) { 1649 sc->sc_if.if_oerrors++; 1650 goto next; 1651 } 1652 } 1653 1654 bridge_enqueue(sc, dst_if, mc, 0); 1655 1656 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0 && 1657 dst_if != ifp) 1658 { 1659 if (PSLIST_READER_NEXT(bif, 1660 struct bridge_iflist, bif_next) == NULL) 1661 { 1662 used = true; 1663 mc = m; 1664 } else { 1665 mc = m_copypacket(m, M_DONTWAIT); 1666 if (mc == NULL) { 1667 sc->sc_if.if_oerrors++; 1668 goto next; 1669 } 1670 } 1671 1672 m_set_rcvif(mc, dst_if); 1673 mc->m_flags &= ~M_PROMISC; 1674 1675 s = splsoftnet(); 1676 KERNEL_LOCK_UNLESS_IFP_MPSAFE(dst_if); 1677 ether_input(dst_if, mc); 1678 KERNEL_UNLOCK_UNLESS_IFP_MPSAFE(dst_if); 1679 splx(s); 1680 } 1681 1682 next: 1683 BRIDGE_PSZ_RENTER(s); 1684 bridge_release_member(sc, bif, &psref); 1685 1686 /* Guarantee we don't re-enter the loop as we already 1687 * decided we're at the end. */ 1688 if (used) 1689 break; 1690 } 1691 BRIDGE_PSZ_REXIT(s); 1692 1693 if (!used) 1694 m_freem(m); 1695 1696 m = n; 1697 } while (m != NULL); 1698 return 0; 1699 1700 unicast_asis: 1701 /* 1702 * XXX Spanning tree consideration here? 1703 */ 1704 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1705 m_freem(m); 1706 else 1707 bridge_enqueue(sc, dst_if, m, 0); 1708 return 0; 1709 } 1710 1711 /* 1712 * bridge_start: 1713 * 1714 * Start output on a bridge. 1715 * 1716 * NOTE: This routine should never be called in this implementation. 1717 */ 1718 static void 1719 bridge_start(struct ifnet *ifp) 1720 { 1721 1722 printf("%s: bridge_start() called\n", ifp->if_xname); 1723 } 1724 1725 /* 1726 * bridge_forward: 1727 * 1728 * The forwarding function of the bridge. 1729 */ 1730 static void 1731 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1732 { 1733 struct bridge_iflist *bif; 1734 struct ifnet *src_if, *dst_if; 1735 struct ether_header *eh; 1736 struct psref psref; 1737 struct psref psref_src; 1738 DECLARE_LOCK_VARIABLE; 1739 1740 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1741 return; 1742 1743 src_if = m_get_rcvif_psref(m, &psref_src); 1744 if (src_if == NULL) { 1745 /* Interface is being destroyed? */ 1746 m_freem(m); 1747 goto out; 1748 } 1749 1750 sc->sc_if.if_ipackets++; 1751 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1752 1753 /* 1754 * Look up the bridge_iflist. 1755 */ 1756 bif = bridge_lookup_member_if(sc, src_if, &psref); 1757 if (bif == NULL) { 1758 /* Interface is not a bridge member (anymore?) */ 1759 m_freem(m); 1760 goto out; 1761 } 1762 1763 if (bif->bif_flags & IFBIF_STP) { 1764 switch (bif->bif_state) { 1765 case BSTP_IFSTATE_BLOCKING: 1766 case BSTP_IFSTATE_LISTENING: 1767 case BSTP_IFSTATE_DISABLED: 1768 m_freem(m); 1769 bridge_release_member(sc, bif, &psref); 1770 goto out; 1771 } 1772 } 1773 1774 eh = mtod(m, struct ether_header *); 1775 1776 /* 1777 * If the interface is learning, and the source 1778 * address is valid and not multicast, record 1779 * the address. 1780 */ 1781 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1782 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1783 (eh->ether_shost[0] == 0 && 1784 eh->ether_shost[1] == 0 && 1785 eh->ether_shost[2] == 0 && 1786 eh->ether_shost[3] == 0 && 1787 eh->ether_shost[4] == 0 && 1788 eh->ether_shost[5] == 0) == 0) { 1789 (void) bridge_rtupdate(sc, eh->ether_shost, 1790 src_if, 0, IFBAF_DYNAMIC); 1791 } 1792 1793 if ((bif->bif_flags & IFBIF_STP) != 0 && 1794 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1795 m_freem(m); 1796 bridge_release_member(sc, bif, &psref); 1797 goto out; 1798 } 1799 1800 bridge_release_member(sc, bif, &psref); 1801 1802 /* 1803 * At this point, the port either doesn't participate 1804 * in spanning tree or it is in the forwarding state. 1805 */ 1806 1807 /* 1808 * If the packet is unicast, destined for someone on 1809 * "this" side of the bridge, drop it. 1810 */ 1811 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1812 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1813 if (src_if == dst_if) { 1814 m_freem(m); 1815 goto out; 1816 } 1817 } else { 1818 /* ...forward it to all interfaces. */ 1819 sc->sc_if.if_imcasts++; 1820 dst_if = NULL; 1821 } 1822 1823 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, src_if, PFIL_IN) != 0) { 1824 if (m != NULL) 1825 m_freem(m); 1826 goto out; 1827 } 1828 if (m == NULL) 1829 goto out; 1830 1831 if (dst_if == NULL) { 1832 bridge_broadcast(sc, src_if, m); 1833 goto out; 1834 } 1835 1836 m_put_rcvif_psref(src_if, &psref_src); 1837 src_if = NULL; 1838 1839 /* 1840 * At this point, we're dealing with a unicast frame 1841 * going to a different interface. 1842 */ 1843 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1844 m_freem(m); 1845 goto out; 1846 } 1847 1848 bif = bridge_lookup_member_if(sc, dst_if, &psref); 1849 if (bif == NULL) { 1850 /* Not a member of the bridge (anymore?) */ 1851 m_freem(m); 1852 goto out; 1853 } 1854 1855 if (bif->bif_flags & IFBIF_STP) { 1856 switch (bif->bif_state) { 1857 case BSTP_IFSTATE_DISABLED: 1858 case BSTP_IFSTATE_BLOCKING: 1859 m_freem(m); 1860 bridge_release_member(sc, bif, &psref); 1861 goto out; 1862 } 1863 } 1864 1865 bridge_release_member(sc, bif, &psref); 1866 1867 /* 1868 * Before enqueueing this packet to the destination interface, 1869 * clear any in-bound checksum flags to prevent them from being 1870 * misused as out-bound flags. 1871 */ 1872 m->m_pkthdr.csum_flags = 0; 1873 1874 ACQUIRE_GLOBAL_LOCKS(); 1875 bridge_enqueue(sc, dst_if, m, 1); 1876 RELEASE_GLOBAL_LOCKS(); 1877 out: 1878 if (src_if != NULL) 1879 m_put_rcvif_psref(src_if, &psref_src); 1880 return; 1881 } 1882 1883 static bool 1884 bstp_state_before_learning(struct bridge_iflist *bif) 1885 { 1886 if (bif->bif_flags & IFBIF_STP) { 1887 switch (bif->bif_state) { 1888 case BSTP_IFSTATE_BLOCKING: 1889 case BSTP_IFSTATE_LISTENING: 1890 case BSTP_IFSTATE_DISABLED: 1891 return true; 1892 } 1893 } 1894 return false; 1895 } 1896 1897 static bool 1898 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1899 { 1900 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1901 1902 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1903 #if NCARP > 0 1904 || (bif->bif_ifp->if_carp && 1905 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1906 #endif /* NCARP > 0 */ 1907 ) 1908 return true; 1909 1910 return false; 1911 } 1912 1913 /* 1914 * bridge_input: 1915 * 1916 * Receive input from a member interface. Queue the packet for 1917 * bridging if it is not for us. 1918 */ 1919 static void 1920 bridge_input(struct ifnet *ifp, struct mbuf *m) 1921 { 1922 struct bridge_softc *sc = ifp->if_bridge; 1923 struct bridge_iflist *bif; 1924 struct ether_header *eh; 1925 struct psref psref; 1926 int bound; 1927 DECLARE_LOCK_VARIABLE; 1928 1929 KASSERT(!cpu_intr_p()); 1930 1931 if (__predict_false(sc == NULL) || 1932 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1933 ACQUIRE_GLOBAL_LOCKS(); 1934 ether_input(ifp, m); 1935 RELEASE_GLOBAL_LOCKS(); 1936 return; 1937 } 1938 1939 bound = curlwp_bind(); 1940 bif = bridge_lookup_member_if(sc, ifp, &psref); 1941 if (bif == NULL) { 1942 curlwp_bindx(bound); 1943 ACQUIRE_GLOBAL_LOCKS(); 1944 ether_input(ifp, m); 1945 RELEASE_GLOBAL_LOCKS(); 1946 return; 1947 } 1948 1949 eh = mtod(m, struct ether_header *); 1950 1951 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1952 if (memcmp(etherbroadcastaddr, 1953 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1954 m->m_flags |= M_BCAST; 1955 else 1956 m->m_flags |= M_MCAST; 1957 } 1958 1959 /* 1960 * A 'fast' path for packets addressed to interfaces that are 1961 * part of this bridge. 1962 */ 1963 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 1964 !bstp_state_before_learning(bif)) { 1965 struct bridge_iflist *_bif; 1966 struct ifnet *_ifp = NULL; 1967 int s; 1968 struct psref _psref; 1969 1970 BRIDGE_PSZ_RENTER(s); 1971 BRIDGE_IFLIST_READER_FOREACH(_bif, sc) { 1972 /* It is destined for us. */ 1973 if (bridge_ourether(_bif, eh, 0)) { 1974 bridge_acquire_member(sc, _bif, &_psref); 1975 BRIDGE_PSZ_REXIT(s); 1976 if (_bif->bif_flags & IFBIF_LEARNING) 1977 (void) bridge_rtupdate(sc, 1978 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1979 m_set_rcvif(m, _bif->bif_ifp); 1980 _ifp = _bif->bif_ifp; 1981 bridge_release_member(sc, _bif, &_psref); 1982 goto out; 1983 } 1984 1985 /* We just received a packet that we sent out. */ 1986 if (bridge_ourether(_bif, eh, 1)) 1987 break; 1988 } 1989 BRIDGE_PSZ_REXIT(s); 1990 out: 1991 1992 if (_bif != NULL) { 1993 bridge_release_member(sc, bif, &psref); 1994 curlwp_bindx(bound); 1995 if (_ifp != NULL) { 1996 m->m_flags &= ~M_PROMISC; 1997 ACQUIRE_GLOBAL_LOCKS(); 1998 ether_input(_ifp, m); 1999 RELEASE_GLOBAL_LOCKS(); 2000 } else 2001 m_freem(m); 2002 return; 2003 } 2004 } 2005 2006 /* Tap off 802.1D packets; they do not get forwarded. */ 2007 if (bif->bif_flags & IFBIF_STP && 2008 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 2009 bstp_input(sc, bif, m); 2010 bridge_release_member(sc, bif, &psref); 2011 curlwp_bindx(bound); 2012 return; 2013 } 2014 2015 /* 2016 * A normal switch would discard the packet here, but that's not what 2017 * we've done historically. This also prevents some obnoxious behaviour. 2018 */ 2019 if (bstp_state_before_learning(bif)) { 2020 bridge_release_member(sc, bif, &psref); 2021 curlwp_bindx(bound); 2022 ACQUIRE_GLOBAL_LOCKS(); 2023 ether_input(ifp, m); 2024 RELEASE_GLOBAL_LOCKS(); 2025 return; 2026 } 2027 2028 bridge_release_member(sc, bif, &psref); 2029 2030 bridge_forward(sc, m); 2031 2032 curlwp_bindx(bound); 2033 } 2034 2035 /* 2036 * bridge_broadcast: 2037 * 2038 * Send a frame to all interfaces that are members of 2039 * the bridge, except for the one on which the packet 2040 * arrived. 2041 */ 2042 static void 2043 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2044 struct mbuf *m) 2045 { 2046 struct bridge_iflist *bif; 2047 struct mbuf *mc; 2048 struct ifnet *dst_if; 2049 bool bmcast; 2050 int s; 2051 DECLARE_LOCK_VARIABLE; 2052 2053 bmcast = m->m_flags & (M_BCAST|M_MCAST); 2054 2055 BRIDGE_PSZ_RENTER(s); 2056 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 2057 struct psref psref; 2058 2059 bridge_acquire_member(sc, bif, &psref); 2060 BRIDGE_PSZ_REXIT(s); 2061 2062 dst_if = bif->bif_ifp; 2063 2064 if (bif->bif_flags & IFBIF_STP) { 2065 switch (bif->bif_state) { 2066 case BSTP_IFSTATE_BLOCKING: 2067 case BSTP_IFSTATE_DISABLED: 2068 goto next; 2069 } 2070 } 2071 2072 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 2073 goto next; 2074 2075 if ((dst_if->if_flags & IFF_RUNNING) == 0) 2076 goto next; 2077 2078 if (dst_if != src_if) { 2079 mc = m_copypacket(m, M_DONTWAIT); 2080 if (mc == NULL) { 2081 sc->sc_if.if_oerrors++; 2082 goto next; 2083 } 2084 /* 2085 * Before enqueueing this packet to the destination 2086 * interface, clear any in-bound checksum flags to 2087 * prevent them from being misused as out-bound flags. 2088 */ 2089 mc->m_pkthdr.csum_flags = 0; 2090 2091 ACQUIRE_GLOBAL_LOCKS(); 2092 bridge_enqueue(sc, dst_if, mc, 1); 2093 RELEASE_GLOBAL_LOCKS(); 2094 } 2095 2096 if (bmcast) { 2097 mc = m_copypacket(m, M_DONTWAIT); 2098 if (mc == NULL) { 2099 sc->sc_if.if_oerrors++; 2100 goto next; 2101 } 2102 2103 m_set_rcvif(mc, dst_if); 2104 mc->m_flags &= ~M_PROMISC; 2105 2106 ACQUIRE_GLOBAL_LOCKS(); 2107 ether_input(dst_if, mc); 2108 RELEASE_GLOBAL_LOCKS(); 2109 } 2110 next: 2111 BRIDGE_PSZ_RENTER(s); 2112 bridge_release_member(sc, bif, &psref); 2113 } 2114 BRIDGE_PSZ_REXIT(s); 2115 2116 m_freem(m); 2117 } 2118 2119 static int 2120 bridge_rtalloc(struct bridge_softc *sc, const uint8_t *dst, 2121 struct bridge_rtnode **brtp) 2122 { 2123 struct bridge_rtnode *brt; 2124 int error; 2125 2126 if (sc->sc_brtcnt >= sc->sc_brtmax) 2127 return ENOSPC; 2128 2129 /* 2130 * Allocate a new bridge forwarding node, and 2131 * initialize the expiration time and Ethernet 2132 * address. 2133 */ 2134 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 2135 if (brt == NULL) 2136 return ENOMEM; 2137 2138 memset(brt, 0, sizeof(*brt)); 2139 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2140 brt->brt_flags = IFBAF_DYNAMIC; 2141 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2142 PSLIST_ENTRY_INIT(brt, brt_list); 2143 PSLIST_ENTRY_INIT(brt, brt_hash); 2144 2145 BRIDGE_RT_LOCK(sc); 2146 error = bridge_rtnode_insert(sc, brt); 2147 BRIDGE_RT_UNLOCK(sc); 2148 2149 if (error != 0) { 2150 pool_put(&bridge_rtnode_pool, brt); 2151 return error; 2152 } 2153 2154 *brtp = brt; 2155 return 0; 2156 } 2157 2158 /* 2159 * bridge_rtupdate: 2160 * 2161 * Add a bridge routing entry. 2162 */ 2163 static int 2164 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 2165 struct ifnet *dst_if, int setflags, uint8_t flags) 2166 { 2167 struct bridge_rtnode *brt; 2168 int s; 2169 2170 again: 2171 /* 2172 * A route for this destination might already exist. If so, 2173 * update it, otherwise create a new one. 2174 */ 2175 BRIDGE_RT_RENTER(s); 2176 brt = bridge_rtnode_lookup(sc, dst); 2177 2178 if (brt != NULL) { 2179 brt->brt_ifp = dst_if; 2180 if (setflags) { 2181 brt->brt_flags = flags; 2182 if (flags & IFBAF_STATIC) 2183 brt->brt_expire = 0; 2184 else 2185 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2186 } else { 2187 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2188 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2189 } 2190 } 2191 BRIDGE_RT_REXIT(s); 2192 2193 if (brt == NULL) { 2194 int r; 2195 2196 r = bridge_rtalloc(sc, dst, &brt); 2197 if (r != 0) 2198 return r; 2199 goto again; 2200 } 2201 2202 return 0; 2203 } 2204 2205 /* 2206 * bridge_rtlookup: 2207 * 2208 * Lookup the destination interface for an address. 2209 */ 2210 static struct ifnet * 2211 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2212 { 2213 struct bridge_rtnode *brt; 2214 struct ifnet *ifs = NULL; 2215 int s; 2216 2217 BRIDGE_RT_RENTER(s); 2218 brt = bridge_rtnode_lookup(sc, addr); 2219 if (brt != NULL) 2220 ifs = brt->brt_ifp; 2221 BRIDGE_RT_REXIT(s); 2222 2223 return ifs; 2224 } 2225 2226 typedef bool (*bridge_iterate_cb_t) 2227 (struct bridge_softc *, struct bridge_rtnode *, bool *, void *); 2228 2229 /* 2230 * bridge_rtlist_iterate_remove: 2231 * 2232 * It iterates on sc->sc_rtlist and removes rtnodes of it which func 2233 * callback judges to remove. Removals of rtnodes are done in a manner 2234 * of pserialize. To this end, all kmem_* operations are placed out of 2235 * mutexes. 2236 */ 2237 static void 2238 bridge_rtlist_iterate_remove(struct bridge_softc *sc, bridge_iterate_cb_t func, void *arg) 2239 { 2240 struct bridge_rtnode *brt; 2241 struct bridge_rtnode **brt_list; 2242 int i, count; 2243 2244 retry: 2245 count = sc->sc_brtcnt; 2246 if (count == 0) 2247 return; 2248 brt_list = kmem_alloc(sizeof(*brt_list) * count, KM_SLEEP); 2249 2250 BRIDGE_RT_LOCK(sc); 2251 if (__predict_false(sc->sc_brtcnt > count)) { 2252 /* The rtnodes increased, we need more memory */ 2253 BRIDGE_RT_UNLOCK(sc); 2254 kmem_free(brt_list, sizeof(*brt_list) * count); 2255 goto retry; 2256 } 2257 2258 i = 0; 2259 /* 2260 * We don't need to use a _SAFE variant here because we know 2261 * that a removed item keeps its next pointer as-is thanks to 2262 * pslist(9) and isn't freed in the loop. 2263 */ 2264 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 2265 bool need_break = false; 2266 if (func(sc, brt, &need_break, arg)) { 2267 bridge_rtnode_remove(sc, brt); 2268 brt_list[i++] = brt; 2269 } 2270 if (need_break) 2271 break; 2272 } 2273 2274 if (i > 0) 2275 BRIDGE_RT_PSZ_PERFORM(sc); 2276 BRIDGE_RT_UNLOCK(sc); 2277 2278 while (--i >= 0) 2279 bridge_rtnode_destroy(brt_list[i]); 2280 2281 kmem_free(brt_list, sizeof(*brt_list) * count); 2282 } 2283 2284 static bool 2285 bridge_rttrim0_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2286 bool *need_break, void *arg) 2287 { 2288 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2289 /* Take into account of the subsequent removal */ 2290 if ((sc->sc_brtcnt - 1) <= sc->sc_brtmax) 2291 *need_break = true; 2292 return true; 2293 } else 2294 return false; 2295 } 2296 2297 static void 2298 bridge_rttrim0(struct bridge_softc *sc) 2299 { 2300 bridge_rtlist_iterate_remove(sc, bridge_rttrim0_cb, NULL); 2301 } 2302 2303 /* 2304 * bridge_rttrim: 2305 * 2306 * Trim the routine table so that we have a number 2307 * of routing entries less than or equal to the 2308 * maximum number. 2309 */ 2310 static void 2311 bridge_rttrim(struct bridge_softc *sc) 2312 { 2313 2314 /* Make sure we actually need to do this. */ 2315 if (sc->sc_brtcnt <= sc->sc_brtmax) 2316 return; 2317 2318 /* Force an aging cycle; this might trim enough addresses. */ 2319 bridge_rtage(sc); 2320 if (sc->sc_brtcnt <= sc->sc_brtmax) 2321 return; 2322 2323 bridge_rttrim0(sc); 2324 2325 return; 2326 } 2327 2328 /* 2329 * bridge_timer: 2330 * 2331 * Aging timer for the bridge. 2332 */ 2333 static void 2334 bridge_timer(void *arg) 2335 { 2336 struct bridge_softc *sc = arg; 2337 2338 workqueue_enqueue(sc->sc_rtage_wq, &sc->sc_rtage_wk, NULL); 2339 } 2340 2341 static void 2342 bridge_rtage_work(struct work *wk, void *arg) 2343 { 2344 struct bridge_softc *sc = arg; 2345 2346 KASSERT(wk == &sc->sc_rtage_wk); 2347 2348 bridge_rtage(sc); 2349 2350 if (sc->sc_if.if_flags & IFF_RUNNING) 2351 callout_reset(&sc->sc_brcallout, 2352 bridge_rtable_prune_period * hz, bridge_timer, sc); 2353 } 2354 2355 static bool 2356 bridge_rtage_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2357 bool *need_break, void *arg) 2358 { 2359 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2360 time_uptime >= brt->brt_expire) 2361 return true; 2362 else 2363 return false; 2364 } 2365 2366 /* 2367 * bridge_rtage: 2368 * 2369 * Perform an aging cycle. 2370 */ 2371 static void 2372 bridge_rtage(struct bridge_softc *sc) 2373 { 2374 bridge_rtlist_iterate_remove(sc, bridge_rtage_cb, NULL); 2375 } 2376 2377 2378 static bool 2379 bridge_rtflush_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2380 bool *need_break, void *arg) 2381 { 2382 int full = *(int*)arg; 2383 2384 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2385 return true; 2386 else 2387 return false; 2388 } 2389 2390 /* 2391 * bridge_rtflush: 2392 * 2393 * Remove all dynamic addresses from the bridge. 2394 */ 2395 static void 2396 bridge_rtflush(struct bridge_softc *sc, int full) 2397 { 2398 bridge_rtlist_iterate_remove(sc, bridge_rtflush_cb, &full); 2399 } 2400 2401 /* 2402 * bridge_rtdaddr: 2403 * 2404 * Remove an address from the table. 2405 */ 2406 static int 2407 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2408 { 2409 struct bridge_rtnode *brt; 2410 2411 BRIDGE_RT_LOCK(sc); 2412 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2413 BRIDGE_RT_UNLOCK(sc); 2414 return ENOENT; 2415 } 2416 bridge_rtnode_remove(sc, brt); 2417 BRIDGE_RT_PSZ_PERFORM(sc); 2418 BRIDGE_RT_UNLOCK(sc); 2419 2420 bridge_rtnode_destroy(brt); 2421 2422 return 0; 2423 } 2424 2425 /* 2426 * bridge_rtdelete: 2427 * 2428 * Delete routes to a speicifc member interface. 2429 */ 2430 static void 2431 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2432 { 2433 struct bridge_rtnode *brt; 2434 2435 /* XXX pserialize_perform for each entry is slow */ 2436 again: 2437 BRIDGE_RT_LOCK(sc); 2438 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 2439 if (brt->brt_ifp == ifp) 2440 break; 2441 } 2442 if (brt == NULL) { 2443 BRIDGE_RT_UNLOCK(sc); 2444 return; 2445 } 2446 bridge_rtnode_remove(sc, brt); 2447 BRIDGE_RT_PSZ_PERFORM(sc); 2448 BRIDGE_RT_UNLOCK(sc); 2449 2450 bridge_rtnode_destroy(brt); 2451 2452 goto again; 2453 } 2454 2455 /* 2456 * bridge_rtable_init: 2457 * 2458 * Initialize the route table for this bridge. 2459 */ 2460 static void 2461 bridge_rtable_init(struct bridge_softc *sc) 2462 { 2463 int i; 2464 2465 sc->sc_rthash = kmem_alloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2466 KM_SLEEP); 2467 2468 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2469 PSLIST_INIT(&sc->sc_rthash[i]); 2470 2471 sc->sc_rthash_key = cprng_fast32(); 2472 2473 PSLIST_INIT(&sc->sc_rtlist); 2474 2475 sc->sc_rtlist_psz = pserialize_create(); 2476 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 2477 } 2478 2479 /* 2480 * bridge_rtable_fini: 2481 * 2482 * Deconstruct the route table for this bridge. 2483 */ 2484 static void 2485 bridge_rtable_fini(struct bridge_softc *sc) 2486 { 2487 2488 kmem_free(sc->sc_rthash, sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE); 2489 mutex_obj_free(sc->sc_rtlist_lock); 2490 pserialize_destroy(sc->sc_rtlist_psz); 2491 } 2492 2493 /* 2494 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2495 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2496 */ 2497 #define mix(a, b, c) \ 2498 do { \ 2499 a -= b; a -= c; a ^= (c >> 13); \ 2500 b -= c; b -= a; b ^= (a << 8); \ 2501 c -= a; c -= b; c ^= (b >> 13); \ 2502 a -= b; a -= c; a ^= (c >> 12); \ 2503 b -= c; b -= a; b ^= (a << 16); \ 2504 c -= a; c -= b; c ^= (b >> 5); \ 2505 a -= b; a -= c; a ^= (c >> 3); \ 2506 b -= c; b -= a; b ^= (a << 10); \ 2507 c -= a; c -= b; c ^= (b >> 15); \ 2508 } while (/*CONSTCOND*/0) 2509 2510 static inline uint32_t 2511 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2512 { 2513 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2514 2515 b += addr[5] << 8; 2516 b += addr[4]; 2517 a += addr[3] << 24; 2518 a += addr[2] << 16; 2519 a += addr[1] << 8; 2520 a += addr[0]; 2521 2522 mix(a, b, c); 2523 2524 return (c & BRIDGE_RTHASH_MASK); 2525 } 2526 2527 #undef mix 2528 2529 /* 2530 * bridge_rtnode_lookup: 2531 * 2532 * Look up a bridge route node for the specified destination. 2533 */ 2534 static struct bridge_rtnode * 2535 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2536 { 2537 struct bridge_rtnode *brt; 2538 uint32_t hash; 2539 int dir; 2540 2541 hash = bridge_rthash(sc, addr); 2542 BRIDGE_RTHASH_READER_FOREACH(brt, sc, hash) { 2543 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2544 if (dir == 0) 2545 return brt; 2546 if (dir > 0) 2547 return NULL; 2548 } 2549 2550 return NULL; 2551 } 2552 2553 /* 2554 * bridge_rtnode_insert: 2555 * 2556 * Insert the specified bridge node into the route table. We 2557 * assume the entry is not already in the table. 2558 */ 2559 static int 2560 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2561 { 2562 struct bridge_rtnode *lbrt, *prev = NULL; 2563 uint32_t hash; 2564 2565 KASSERT(BRIDGE_RT_LOCKED(sc)); 2566 2567 hash = bridge_rthash(sc, brt->brt_addr); 2568 BRIDGE_RTHASH_WRITER_FOREACH(lbrt, sc, hash) { 2569 int dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2570 if (dir == 0) 2571 return EEXIST; 2572 if (dir > 0) 2573 break; 2574 prev = lbrt; 2575 } 2576 if (prev == NULL) 2577 BRIDGE_RTHASH_WRITER_INSERT_HEAD(sc, hash, brt); 2578 else 2579 BRIDGE_RTHASH_WRITER_INSERT_AFTER(prev, brt); 2580 2581 BRIDGE_RTLIST_WRITER_INSERT_HEAD(sc, brt); 2582 sc->sc_brtcnt++; 2583 2584 return 0; 2585 } 2586 2587 /* 2588 * bridge_rtnode_remove: 2589 * 2590 * Remove a bridge rtnode from the rthash and the rtlist of a bridge. 2591 */ 2592 static void 2593 bridge_rtnode_remove(struct bridge_softc *sc, struct bridge_rtnode *brt) 2594 { 2595 2596 KASSERT(BRIDGE_RT_LOCKED(sc)); 2597 2598 BRIDGE_RTHASH_WRITER_REMOVE(brt); 2599 BRIDGE_RTLIST_WRITER_REMOVE(brt); 2600 sc->sc_brtcnt--; 2601 } 2602 2603 /* 2604 * bridge_rtnode_destroy: 2605 * 2606 * Destroy a bridge rtnode. 2607 */ 2608 static void 2609 bridge_rtnode_destroy(struct bridge_rtnode *brt) 2610 { 2611 2612 PSLIST_ENTRY_DESTROY(brt, brt_list); 2613 PSLIST_ENTRY_DESTROY(brt, brt_hash); 2614 pool_put(&bridge_rtnode_pool, brt); 2615 } 2616 2617 #if defined(BRIDGE_IPF) 2618 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2619 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2620 2621 /* 2622 * Send bridge packets through IPF if they are one of the types IPF can deal 2623 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2624 * question.) 2625 */ 2626 static int 2627 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2628 { 2629 int snap, error; 2630 struct ether_header *eh1, eh2; 2631 struct llc llc1; 2632 uint16_t ether_type; 2633 2634 snap = 0; 2635 error = -1; /* Default error if not error == 0 */ 2636 eh1 = mtod(*mp, struct ether_header *); 2637 ether_type = ntohs(eh1->ether_type); 2638 2639 /* 2640 * Check for SNAP/LLC. 2641 */ 2642 if (ether_type < ETHERMTU) { 2643 struct llc *llc2 = (struct llc *)(eh1 + 1); 2644 2645 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2646 llc2->llc_dsap == LLC_SNAP_LSAP && 2647 llc2->llc_ssap == LLC_SNAP_LSAP && 2648 llc2->llc_control == LLC_UI) { 2649 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2650 snap = 1; 2651 } 2652 } 2653 2654 /* 2655 * If we're trying to filter bridge traffic, don't look at anything 2656 * other than IP and ARP traffic. If the filter doesn't understand 2657 * IPv6, don't allow IPv6 through the bridge either. This is lame 2658 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2659 * but of course we don't have an AppleTalk filter to begin with. 2660 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2661 * ARP traffic.) 2662 */ 2663 switch (ether_type) { 2664 case ETHERTYPE_ARP: 2665 case ETHERTYPE_REVARP: 2666 return 0; /* Automatically pass */ 2667 case ETHERTYPE_IP: 2668 # ifdef INET6 2669 case ETHERTYPE_IPV6: 2670 # endif /* INET6 */ 2671 break; 2672 default: 2673 goto bad; 2674 } 2675 2676 /* Strip off the Ethernet header and keep a copy. */ 2677 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2678 m_adj(*mp, ETHER_HDR_LEN); 2679 2680 /* Strip off snap header, if present */ 2681 if (snap) { 2682 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2683 m_adj(*mp, sizeof(struct llc)); 2684 } 2685 2686 /* 2687 * Check basic packet sanity and run IPF through pfil. 2688 */ 2689 KASSERT(!cpu_intr_p()); 2690 switch (ether_type) 2691 { 2692 case ETHERTYPE_IP : 2693 error = bridge_ip_checkbasic(mp); 2694 if (error == 0) 2695 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2696 break; 2697 # ifdef INET6 2698 case ETHERTYPE_IPV6 : 2699 error = bridge_ip6_checkbasic(mp); 2700 if (error == 0) 2701 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2702 break; 2703 # endif 2704 default : 2705 error = 0; 2706 break; 2707 } 2708 2709 if (*mp == NULL) 2710 return error; 2711 if (error != 0) 2712 goto bad; 2713 2714 error = -1; 2715 2716 /* 2717 * Finally, put everything back the way it was and return 2718 */ 2719 if (snap) { 2720 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2721 if (*mp == NULL) 2722 return error; 2723 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2724 } 2725 2726 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2727 if (*mp == NULL) 2728 return error; 2729 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2730 2731 return 0; 2732 2733 bad: 2734 m_freem(*mp); 2735 *mp = NULL; 2736 return error; 2737 } 2738 2739 /* 2740 * Perform basic checks on header size since 2741 * IPF assumes ip_input has already processed 2742 * it for it. Cut-and-pasted from ip_input.c. 2743 * Given how simple the IPv6 version is, 2744 * does the IPv4 version really need to be 2745 * this complicated? 2746 * 2747 * XXX Should we update ipstat here, or not? 2748 * XXX Right now we update ipstat but not 2749 * XXX csum_counter. 2750 */ 2751 static int 2752 bridge_ip_checkbasic(struct mbuf **mp) 2753 { 2754 struct mbuf *m = *mp; 2755 struct ip *ip; 2756 int len, hlen; 2757 2758 if (*mp == NULL) 2759 return -1; 2760 2761 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2762 if ((m = m_copyup(m, sizeof(struct ip), 2763 (max_linkhdr + 3) & ~3)) == NULL) { 2764 /* XXXJRT new stat, please */ 2765 ip_statinc(IP_STAT_TOOSMALL); 2766 goto bad; 2767 } 2768 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2769 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2770 ip_statinc(IP_STAT_TOOSMALL); 2771 goto bad; 2772 } 2773 } 2774 ip = mtod(m, struct ip *); 2775 if (ip == NULL) goto bad; 2776 2777 if (ip->ip_v != IPVERSION) { 2778 ip_statinc(IP_STAT_BADVERS); 2779 goto bad; 2780 } 2781 hlen = ip->ip_hl << 2; 2782 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2783 ip_statinc(IP_STAT_BADHLEN); 2784 goto bad; 2785 } 2786 if (hlen > m->m_len) { 2787 if ((m = m_pullup(m, hlen)) == 0) { 2788 ip_statinc(IP_STAT_BADHLEN); 2789 goto bad; 2790 } 2791 ip = mtod(m, struct ip *); 2792 if (ip == NULL) goto bad; 2793 } 2794 2795 switch (m->m_pkthdr.csum_flags & 2796 ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_IPv4) | 2797 M_CSUM_IPv4_BAD)) { 2798 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2799 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2800 goto bad; 2801 2802 case M_CSUM_IPv4: 2803 /* Checksum was okay. */ 2804 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2805 break; 2806 2807 default: 2808 /* Must compute it ourselves. */ 2809 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2810 if (in_cksum(m, hlen) != 0) 2811 goto bad; 2812 break; 2813 } 2814 2815 /* Retrieve the packet length. */ 2816 len = ntohs(ip->ip_len); 2817 2818 /* 2819 * Check for additional length bogosity 2820 */ 2821 if (len < hlen) { 2822 ip_statinc(IP_STAT_BADLEN); 2823 goto bad; 2824 } 2825 2826 /* 2827 * Check that the amount of data in the buffers 2828 * is as at least much as the IP header would have us expect. 2829 * Drop packet if shorter than we expect. 2830 */ 2831 if (m->m_pkthdr.len < len) { 2832 ip_statinc(IP_STAT_TOOSHORT); 2833 goto bad; 2834 } 2835 2836 /* Checks out, proceed */ 2837 *mp = m; 2838 return 0; 2839 2840 bad: 2841 *mp = m; 2842 return -1; 2843 } 2844 2845 # ifdef INET6 2846 /* 2847 * Same as above, but for IPv6. 2848 * Cut-and-pasted from ip6_input.c. 2849 * XXX Should we update ip6stat, or not? 2850 */ 2851 static int 2852 bridge_ip6_checkbasic(struct mbuf **mp) 2853 { 2854 struct mbuf *m = *mp; 2855 struct ip6_hdr *ip6; 2856 2857 /* 2858 * If the IPv6 header is not aligned, slurp it up into a new 2859 * mbuf with space for link headers, in the event we forward 2860 * it. Otherwise, if it is aligned, make sure the entire base 2861 * IPv6 header is in the first mbuf of the chain. 2862 */ 2863 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2864 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2865 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2866 (max_linkhdr + 3) & ~3)) == NULL) { 2867 /* XXXJRT new stat, please */ 2868 ip6_statinc(IP6_STAT_TOOSMALL); 2869 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2870 goto bad; 2871 } 2872 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2873 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2874 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2875 ip6_statinc(IP6_STAT_TOOSMALL); 2876 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2877 goto bad; 2878 } 2879 } 2880 2881 ip6 = mtod(m, struct ip6_hdr *); 2882 2883 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2884 ip6_statinc(IP6_STAT_BADVERS); 2885 in6_ifstat_inc(m_get_rcvif_NOMPSAFE(m), ifs6_in_hdrerr); 2886 goto bad; 2887 } 2888 2889 /* Checks out, proceed */ 2890 *mp = m; 2891 return 0; 2892 2893 bad: 2894 *mp = m; 2895 return -1; 2896 } 2897 # endif /* INET6 */ 2898 #endif /* BRIDGE_IPF */ 2899
Indexes created Thu Oct 02 14:10:14 GMT 2025