if_bridge.c revision 1.180
1 /* $NetBSD: if_bridge.c,v 1.180 2021/06/16 00:21:19 riastradh Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (c) 1999, 2000 Jason L. Wright (jason (at) thought.net) 40 * All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by Jason L. Wright 53 * 4. The name of the author may not be used to endorse or promote products 54 * derived from this software without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 57 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 58 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 59 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 60 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 61 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 62 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 64 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 65 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 66 * POSSIBILITY OF SUCH DAMAGE. 67 * 68 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 69 */ 70 71 /* 72 * Network interface bridge support. 73 * 74 * TODO: 75 * 76 * - Currently only supports Ethernet-like interfaces (Ethernet, 77 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 78 * to bridge other types of interfaces (FDDI-FDDI, and maybe 79 * consider heterogenous bridges). 80 */ 81 82 #include <sys/cdefs.h> 83 __KERNEL_RCSID(0, "$NetBSD: if_bridge.c,v 1.180 2021/06/16 00:21:19 riastradh Exp $"); 84 85 #ifdef _KERNEL_OPT 86 #include "opt_inet.h" 87 #include "opt_net_mpsafe.h" 88 #endif /* _KERNEL_OPT */ 89 90 #include <sys/param.h> 91 #include <sys/kernel.h> 92 #include <sys/mbuf.h> 93 #include <sys/queue.h> 94 #include <sys/socket.h> 95 #include <sys/socketvar.h> /* for softnet_lock */ 96 #include <sys/sockio.h> 97 #include <sys/systm.h> 98 #include <sys/proc.h> 99 #include <sys/pool.h> 100 #include <sys/kauth.h> 101 #include <sys/cpu.h> 102 #include <sys/cprng.h> 103 #include <sys/mutex.h> 104 #include <sys/kmem.h> 105 106 #include <net/bpf.h> 107 #include <net/if.h> 108 #include <net/if_dl.h> 109 #include <net/if_types.h> 110 #include <net/if_llc.h> 111 112 #include <net/if_ether.h> 113 #include <net/if_bridgevar.h> 114 #include <net/ether_sw_offload.h> 115 116 /* Used for bridge_ip[6]_checkbasic */ 117 #include <netinet/in.h> 118 #include <netinet/in_systm.h> 119 #include <netinet/ip.h> 120 #include <netinet/ip_var.h> 121 #include <netinet/ip_private.h> /* XXX */ 122 #include <netinet/ip6.h> 123 #include <netinet6/in6_var.h> 124 #include <netinet6/ip6_var.h> 125 #include <netinet6/ip6_private.h> /* XXX */ 126 127 /* 128 * Size of the route hash table. Must be a power of two. 129 */ 130 #ifndef BRIDGE_RTHASH_SIZE 131 #define BRIDGE_RTHASH_SIZE 1024 132 #endif 133 134 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 135 136 #include "carp.h" 137 #if NCARP > 0 138 #include <netinet/in.h> 139 #include <netinet/in_var.h> 140 #include <netinet/ip_carp.h> 141 #endif 142 143 #include "ioconf.h" 144 145 __CTASSERT(sizeof(struct ifbifconf) == sizeof(struct ifbaconf)); 146 __CTASSERT(offsetof(struct ifbifconf, ifbic_len) == offsetof(struct ifbaconf, ifbac_len)); 147 __CTASSERT(offsetof(struct ifbifconf, ifbic_buf) == offsetof(struct ifbaconf, ifbac_buf)); 148 149 /* 150 * Maximum number of addresses to cache. 151 */ 152 #ifndef BRIDGE_RTABLE_MAX 153 #define BRIDGE_RTABLE_MAX 100 154 #endif 155 156 /* 157 * Spanning tree defaults. 158 */ 159 #define BSTP_DEFAULT_MAX_AGE (20 * 256) 160 #define BSTP_DEFAULT_HELLO_TIME (2 * 256) 161 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) 162 #define BSTP_DEFAULT_HOLD_TIME (1 * 256) 163 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 164 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 165 #define BSTP_DEFAULT_PATH_COST 55 166 167 /* 168 * Timeout (in seconds) for entries learned dynamically. 169 */ 170 #ifndef BRIDGE_RTABLE_TIMEOUT 171 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 172 #endif 173 174 /* 175 * Number of seconds between walks of the route list. 176 */ 177 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 178 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 179 #endif 180 181 #define BRIDGE_RT_LOCK(_sc) mutex_enter((_sc)->sc_rtlist_lock) 182 #define BRIDGE_RT_UNLOCK(_sc) mutex_exit((_sc)->sc_rtlist_lock) 183 #define BRIDGE_RT_LOCKED(_sc) mutex_owned((_sc)->sc_rtlist_lock) 184 185 #define BRIDGE_RT_PSZ_PERFORM(_sc) \ 186 pserialize_perform((_sc)->sc_rtlist_psz) 187 188 #define BRIDGE_RT_RENTER(__s) do { __s = pserialize_read_enter(); } while (0) 189 #define BRIDGE_RT_REXIT(__s) do { pserialize_read_exit(__s); } while (0) 190 191 #define BRIDGE_RTLIST_READER_FOREACH(_brt, _sc) \ 192 PSLIST_READER_FOREACH((_brt), &((_sc)->sc_rtlist), \ 193 struct bridge_rtnode, brt_list) 194 #define BRIDGE_RTLIST_WRITER_FOREACH(_brt, _sc) \ 195 PSLIST_WRITER_FOREACH((_brt), &((_sc)->sc_rtlist), \ 196 struct bridge_rtnode, brt_list) 197 #define BRIDGE_RTLIST_WRITER_INSERT_HEAD(_sc, _brt) \ 198 PSLIST_WRITER_INSERT_HEAD(&(_sc)->sc_rtlist, brt, brt_list) 199 #define BRIDGE_RTLIST_WRITER_REMOVE(_brt) \ 200 PSLIST_WRITER_REMOVE((_brt), brt_list) 201 202 #define BRIDGE_RTHASH_READER_FOREACH(_brt, _sc, _hash) \ 203 PSLIST_READER_FOREACH((_brt), &(_sc)->sc_rthash[(_hash)], \ 204 struct bridge_rtnode, brt_hash) 205 #define BRIDGE_RTHASH_WRITER_FOREACH(_brt, _sc, _hash) \ 206 PSLIST_WRITER_FOREACH((_brt), &(_sc)->sc_rthash[(_hash)], \ 207 struct bridge_rtnode, brt_hash) 208 #define BRIDGE_RTHASH_WRITER_INSERT_HEAD(_sc, _hash, _brt) \ 209 PSLIST_WRITER_INSERT_HEAD(&(_sc)->sc_rthash[(_hash)], brt, brt_hash) 210 #define BRIDGE_RTHASH_WRITER_INSERT_AFTER(_brt, _new) \ 211 PSLIST_WRITER_INSERT_AFTER((_brt), (_new), brt_hash) 212 #define BRIDGE_RTHASH_WRITER_REMOVE(_brt) \ 213 PSLIST_WRITER_REMOVE((_brt), brt_hash) 214 215 #ifdef NET_MPSAFE 216 #define DECLARE_LOCK_VARIABLE 217 #define ACQUIRE_GLOBAL_LOCKS() do { } while (0) 218 #define RELEASE_GLOBAL_LOCKS() do { } while (0) 219 #else 220 #define DECLARE_LOCK_VARIABLE int __s 221 #define ACQUIRE_GLOBAL_LOCKS() do { \ 222 KERNEL_LOCK(1, NULL); \ 223 mutex_enter(softnet_lock); \ 224 __s = splsoftnet(); \ 225 } while (0) 226 #define RELEASE_GLOBAL_LOCKS() do { \ 227 splx(__s); \ 228 mutex_exit(softnet_lock); \ 229 KERNEL_UNLOCK_ONE(NULL); \ 230 } while (0) 231 #endif 232 233 struct psref_class *bridge_psref_class __read_mostly; 234 235 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 236 237 static struct pool bridge_rtnode_pool; 238 239 static int bridge_clone_create(struct if_clone *, int); 240 static int bridge_clone_destroy(struct ifnet *); 241 242 static int bridge_ioctl(struct ifnet *, u_long, void *); 243 static int bridge_init(struct ifnet *); 244 static void bridge_stop(struct ifnet *, int); 245 static void bridge_start(struct ifnet *); 246 247 static void bridge_input(struct ifnet *, struct mbuf *); 248 static void bridge_forward(struct bridge_softc *, struct mbuf *); 249 250 static void bridge_timer(void *); 251 252 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 253 struct mbuf *); 254 255 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 256 struct ifnet *, int, uint8_t); 257 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 258 static void bridge_rttrim(struct bridge_softc *); 259 static void bridge_rtage(struct bridge_softc *); 260 static void bridge_rtage_work(struct work *, void *); 261 static void bridge_rtflush(struct bridge_softc *, int); 262 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 263 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp); 264 265 static void bridge_rtable_init(struct bridge_softc *); 266 static void bridge_rtable_fini(struct bridge_softc *); 267 268 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 269 const uint8_t *); 270 static int bridge_rtnode_insert(struct bridge_softc *, 271 struct bridge_rtnode *); 272 static void bridge_rtnode_remove(struct bridge_softc *, 273 struct bridge_rtnode *); 274 static void bridge_rtnode_destroy(struct bridge_rtnode *); 275 276 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 277 const char *name, 278 struct psref *); 279 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 280 struct ifnet *ifp, 281 struct psref *); 282 static void bridge_release_member(struct bridge_softc *, struct bridge_iflist *, 283 struct psref *); 284 static void bridge_delete_member(struct bridge_softc *, 285 struct bridge_iflist *); 286 static void bridge_acquire_member(struct bridge_softc *sc, 287 struct bridge_iflist *, 288 struct psref *); 289 290 static int bridge_ioctl_add(struct bridge_softc *, void *); 291 static int bridge_ioctl_del(struct bridge_softc *, void *); 292 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 293 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 294 static int bridge_ioctl_scache(struct bridge_softc *, void *); 295 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 296 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 297 static int bridge_ioctl_rts(struct bridge_softc *, void *); 298 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 299 static int bridge_ioctl_sto(struct bridge_softc *, void *); 300 static int bridge_ioctl_gto(struct bridge_softc *, void *); 301 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 302 static int bridge_ioctl_flush(struct bridge_softc *, void *); 303 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 304 static int bridge_ioctl_spri(struct bridge_softc *, void *); 305 static int bridge_ioctl_ght(struct bridge_softc *, void *); 306 static int bridge_ioctl_sht(struct bridge_softc *, void *); 307 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 308 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 309 static int bridge_ioctl_gma(struct bridge_softc *, void *); 310 static int bridge_ioctl_sma(struct bridge_softc *, void *); 311 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 312 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 313 static int bridge_ioctl_gfilt(struct bridge_softc *, void *); 314 static int bridge_ioctl_sfilt(struct bridge_softc *, void *); 315 static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int); 316 static int bridge_ip_checkbasic(struct mbuf **mp); 317 # ifdef INET6 318 static int bridge_ip6_checkbasic(struct mbuf **mp); 319 # endif /* INET6 */ 320 321 struct bridge_control { 322 int (*bc_func)(struct bridge_softc *, void *); 323 int bc_argsize; 324 int bc_flags; 325 }; 326 327 #define BC_F_COPYIN 0x01 /* copy arguments in */ 328 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 329 #define BC_F_SUSER 0x04 /* do super-user check */ 330 #define BC_F_XLATEIN 0x08 /* xlate arguments in */ 331 #define BC_F_XLATEOUT 0x10 /* xlate arguments out */ 332 333 static const struct bridge_control bridge_control_table[] = { 334 [BRDGADD] = {bridge_ioctl_add, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 335 [BRDGDEL] = {bridge_ioctl_del, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 336 337 [BRDGGIFFLGS] = {bridge_ioctl_gifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_COPYOUT}, 338 [BRDGSIFFLGS] = {bridge_ioctl_sifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 339 340 [BRDGSCACHE] = {bridge_ioctl_scache, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 341 [BRDGGCACHE] = {bridge_ioctl_gcache, sizeof(struct ifbrparam), BC_F_COPYOUT}, 342 343 [OBRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_COPYIN|BC_F_COPYOUT}, 344 [OBRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_COPYIN|BC_F_COPYOUT}, 345 346 [BRDGSADDR] = {bridge_ioctl_saddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 347 348 [BRDGSTO] = {bridge_ioctl_sto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 349 [BRDGGTO] = {bridge_ioctl_gto, sizeof(struct ifbrparam), BC_F_COPYOUT}, 350 351 [BRDGDADDR] = {bridge_ioctl_daddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 352 353 [BRDGFLUSH] = {bridge_ioctl_flush, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 354 355 [BRDGGPRI] = {bridge_ioctl_gpri, sizeof(struct ifbrparam), BC_F_COPYOUT}, 356 [BRDGSPRI] = {bridge_ioctl_spri, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 357 358 [BRDGGHT] = {bridge_ioctl_ght, sizeof(struct ifbrparam), BC_F_COPYOUT}, 359 [BRDGSHT] = {bridge_ioctl_sht, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 360 361 [BRDGGFD] = {bridge_ioctl_gfd, sizeof(struct ifbrparam), BC_F_COPYOUT}, 362 [BRDGSFD] = {bridge_ioctl_sfd, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 363 364 [BRDGGMA] = {bridge_ioctl_gma, sizeof(struct ifbrparam), BC_F_COPYOUT}, 365 [BRDGSMA] = {bridge_ioctl_sma, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 366 367 [BRDGSIFPRIO] = {bridge_ioctl_sifprio, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 368 369 [BRDGSIFCOST] = {bridge_ioctl_sifcost, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 370 371 [BRDGGFILT] = {bridge_ioctl_gfilt, sizeof(struct ifbrparam), BC_F_COPYOUT}, 372 [BRDGSFILT] = {bridge_ioctl_sfilt, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 373 374 [BRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 375 [BRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 376 }; 377 378 static const int bridge_control_table_size = __arraycount(bridge_control_table); 379 380 static struct if_clone bridge_cloner = 381 IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy); 382 383 /* 384 * bridgeattach: 385 * 386 * Pseudo-device attach routine. 387 */ 388 void 389 bridgeattach(int n) 390 { 391 392 pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode), 393 0, 0, 0, "brtpl", NULL, IPL_NET); 394 395 bridge_psref_class = psref_class_create("bridge", IPL_SOFTNET); 396 397 if_clone_attach(&bridge_cloner); 398 } 399 400 /* 401 * bridge_clone_create: 402 * 403 * Create a new bridge instance. 404 */ 405 static int 406 bridge_clone_create(struct if_clone *ifc, int unit) 407 { 408 struct bridge_softc *sc; 409 struct ifnet *ifp; 410 int error; 411 412 sc = kmem_zalloc(sizeof(*sc), KM_SLEEP); 413 ifp = &sc->sc_if; 414 415 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 416 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 417 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 418 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 419 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 420 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 421 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 422 sc->sc_filter_flags = 0; 423 424 /* Initialize our routing table. */ 425 bridge_rtable_init(sc); 426 427 error = workqueue_create(&sc->sc_rtage_wq, "bridge_rtage", 428 bridge_rtage_work, sc, PRI_SOFTNET, IPL_SOFTNET, WQ_MPSAFE); 429 if (error) 430 panic("%s: workqueue_create %d\n", __func__, error); 431 432 callout_init(&sc->sc_brcallout, CALLOUT_MPSAFE); 433 callout_init(&sc->sc_bstpcallout, CALLOUT_MPSAFE); 434 435 mutex_init(&sc->sc_iflist_psref.bip_lock, MUTEX_DEFAULT, IPL_NONE); 436 PSLIST_INIT(&sc->sc_iflist_psref.bip_iflist); 437 sc->sc_iflist_psref.bip_psz = pserialize_create(); 438 439 if_initname(ifp, ifc->ifc_name, unit); 440 ifp->if_softc = sc; 441 #ifdef NET_MPSAFE 442 ifp->if_extflags = IFEF_MPSAFE; 443 #endif 444 ifp->if_mtu = ETHERMTU; 445 ifp->if_ioctl = bridge_ioctl; 446 ifp->if_output = bridge_output; 447 ifp->if_start = bridge_start; 448 ifp->if_stop = bridge_stop; 449 ifp->if_init = bridge_init; 450 ifp->if_type = IFT_BRIDGE; 451 ifp->if_addrlen = 0; 452 ifp->if_dlt = DLT_EN10MB; 453 ifp->if_hdrlen = ETHER_HDR_LEN; 454 if_initialize(ifp); 455 456 /* 457 * Set the link state to down. 458 * When interfaces are added the link state will reflect 459 * the best link state of the combined interfaces. 460 */ 461 ifp->if_link_state = LINK_STATE_DOWN; 462 463 if_alloc_sadl(ifp); 464 if_register(ifp); 465 466 return 0; 467 } 468 469 /* 470 * bridge_clone_destroy: 471 * 472 * Destroy a bridge instance. 473 */ 474 static int 475 bridge_clone_destroy(struct ifnet *ifp) 476 { 477 struct bridge_softc *sc = ifp->if_softc; 478 struct bridge_iflist *bif; 479 480 if ((ifp->if_flags & IFF_RUNNING) != 0) 481 bridge_stop(ifp, 1); 482 483 BRIDGE_LOCK(sc); 484 for (;;) { 485 bif = PSLIST_WRITER_FIRST(&sc->sc_iflist_psref.bip_iflist, struct bridge_iflist, 486 bif_next); 487 if (bif == NULL) 488 break; 489 bridge_delete_member(sc, bif); 490 } 491 PSLIST_DESTROY(&sc->sc_iflist_psref.bip_iflist); 492 BRIDGE_UNLOCK(sc); 493 494 if_detach(ifp); 495 496 /* Tear down the routing table. */ 497 bridge_rtable_fini(sc); 498 499 pserialize_destroy(sc->sc_iflist_psref.bip_psz); 500 mutex_destroy(&sc->sc_iflist_psref.bip_lock); 501 callout_destroy(&sc->sc_brcallout); 502 callout_destroy(&sc->sc_bstpcallout); 503 workqueue_destroy(sc->sc_rtage_wq); 504 kmem_free(sc, sizeof(*sc)); 505 506 return 0; 507 } 508 509 /* 510 * bridge_ioctl: 511 * 512 * Handle a control request from the operator. 513 */ 514 static int 515 bridge_ioctl(struct ifnet *ifp, u_long cmd, void *data) 516 { 517 struct bridge_softc *sc = ifp->if_softc; 518 struct lwp *l = curlwp; /* XXX */ 519 union { 520 struct ifbreq ifbreq; 521 struct ifbifconf ifbifconf; 522 struct ifbareq ifbareq; 523 struct ifbaconf ifbaconf; 524 struct ifbrparam ifbrparam; 525 } args; 526 struct ifdrv *ifd = (struct ifdrv *) data; 527 const struct bridge_control *bc = NULL; /* XXXGCC */ 528 int s, error = 0; 529 530 /* Authorize command before calling splsoftnet(). */ 531 switch (cmd) { 532 case SIOCGDRVSPEC: 533 case SIOCSDRVSPEC: 534 if (ifd->ifd_cmd >= bridge_control_table_size 535 || (bc = &bridge_control_table[ifd->ifd_cmd]) == NULL) { 536 error = EINVAL; 537 return error; 538 } 539 540 /* We only care about BC_F_SUSER at this point. */ 541 if ((bc->bc_flags & BC_F_SUSER) == 0) 542 break; 543 544 error = kauth_authorize_network(l->l_cred, 545 KAUTH_NETWORK_INTERFACE_BRIDGE, 546 cmd == SIOCGDRVSPEC ? 547 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_GETPRIV : 548 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_SETPRIV, 549 ifd, NULL, NULL); 550 if (error) 551 return error; 552 553 break; 554 } 555 556 s = splsoftnet(); 557 558 switch (cmd) { 559 case SIOCGDRVSPEC: 560 case SIOCSDRVSPEC: 561 KASSERT(bc != NULL); 562 if (cmd == SIOCGDRVSPEC && 563 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) == 0) { 564 error = EINVAL; 565 break; 566 } 567 else if (cmd == SIOCSDRVSPEC && 568 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) != 0) { 569 error = EINVAL; 570 break; 571 } 572 573 /* BC_F_SUSER is checked above, before splsoftnet(). */ 574 575 if ((bc->bc_flags & (BC_F_XLATEIN|BC_F_XLATEOUT)) == 0 576 && (ifd->ifd_len != bc->bc_argsize 577 || ifd->ifd_len > sizeof(args))) { 578 error = EINVAL; 579 break; 580 } 581 582 memset(&args, 0, sizeof(args)); 583 if (bc->bc_flags & BC_F_COPYIN) { 584 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 585 if (error) 586 break; 587 } else if (bc->bc_flags & BC_F_XLATEIN) { 588 args.ifbifconf.ifbic_len = ifd->ifd_len; 589 args.ifbifconf.ifbic_buf = ifd->ifd_data; 590 } 591 592 error = (*bc->bc_func)(sc, &args); 593 if (error) 594 break; 595 596 if (bc->bc_flags & BC_F_COPYOUT) { 597 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 598 } else if (bc->bc_flags & BC_F_XLATEOUT) { 599 ifd->ifd_len = args.ifbifconf.ifbic_len; 600 ifd->ifd_data = args.ifbifconf.ifbic_buf; 601 } 602 break; 603 604 case SIOCSIFFLAGS: 605 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 606 break; 607 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 608 case IFF_RUNNING: 609 /* 610 * If interface is marked down and it is running, 611 * then stop and disable it. 612 */ 613 (*ifp->if_stop)(ifp, 1); 614 break; 615 case IFF_UP: 616 /* 617 * If interface is marked up and it is stopped, then 618 * start it. 619 */ 620 error = (*ifp->if_init)(ifp); 621 break; 622 default: 623 break; 624 } 625 break; 626 627 case SIOCSIFMTU: 628 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 629 error = 0; 630 break; 631 632 case SIOCGIFCAP: 633 { 634 struct ifcapreq *ifcr = (struct ifcapreq *)data; 635 ifcr->ifcr_capabilities = sc->sc_capenable; 636 ifcr->ifcr_capenable = sc->sc_capenable; 637 break; 638 } 639 640 default: 641 error = ifioctl_common(ifp, cmd, data); 642 break; 643 } 644 645 splx(s); 646 647 return error; 648 } 649 650 /* 651 * bridge_lookup_member: 652 * 653 * Lookup a bridge member interface. 654 */ 655 static struct bridge_iflist * 656 bridge_lookup_member(struct bridge_softc *sc, const char *name, struct psref *psref) 657 { 658 struct bridge_iflist *bif; 659 struct ifnet *ifp; 660 int s; 661 662 BRIDGE_PSZ_RENTER(s); 663 664 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 665 ifp = bif->bif_ifp; 666 if (strcmp(ifp->if_xname, name) == 0) 667 break; 668 } 669 if (bif != NULL) 670 bridge_acquire_member(sc, bif, psref); 671 672 BRIDGE_PSZ_REXIT(s); 673 674 return bif; 675 } 676 677 /* 678 * bridge_lookup_member_if: 679 * 680 * Lookup a bridge member interface by ifnet*. 681 */ 682 static struct bridge_iflist * 683 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp, 684 struct psref *psref) 685 { 686 struct bridge_iflist *bif; 687 int s; 688 689 BRIDGE_PSZ_RENTER(s); 690 691 bif = member_ifp->if_bridgeif; 692 if (bif != NULL) { 693 psref_acquire(psref, &bif->bif_psref, 694 bridge_psref_class); 695 } 696 697 BRIDGE_PSZ_REXIT(s); 698 699 return bif; 700 } 701 702 static void 703 bridge_acquire_member(struct bridge_softc *sc, struct bridge_iflist *bif, 704 struct psref *psref) 705 { 706 707 psref_acquire(psref, &bif->bif_psref, bridge_psref_class); 708 } 709 710 /* 711 * bridge_release_member: 712 * 713 * Release the specified member interface. 714 */ 715 static void 716 bridge_release_member(struct bridge_softc *sc, struct bridge_iflist *bif, 717 struct psref *psref) 718 { 719 720 psref_release(psref, &bif->bif_psref, bridge_psref_class); 721 } 722 723 /* 724 * bridge_delete_member: 725 * 726 * Delete the specified member interface. 727 */ 728 static void 729 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 730 { 731 struct ifnet *ifs = bif->bif_ifp; 732 733 KASSERT(BRIDGE_LOCKED(sc)); 734 735 ifs->_if_input = ether_input; 736 ifs->if_bridge = NULL; 737 ifs->if_bridgeif = NULL; 738 739 PSLIST_WRITER_REMOVE(bif, bif_next); 740 BRIDGE_PSZ_PERFORM(sc); 741 BRIDGE_UNLOCK(sc); 742 743 switch (ifs->if_type) { 744 case IFT_ETHER: 745 case IFT_L2TP: 746 /* 747 * Take the interface out of promiscuous mode. 748 * Don't call it with holding a spin lock. 749 */ 750 (void) ifpromisc(ifs, 0); 751 IFNET_LOCK(ifs); 752 (void) ether_disable_vlan_mtu(ifs); 753 IFNET_UNLOCK(ifs); 754 break; 755 default: 756 #ifdef DIAGNOSTIC 757 panic("%s: impossible", __func__); 758 #endif 759 break; 760 } 761 762 psref_target_destroy(&bif->bif_psref, bridge_psref_class); 763 764 PSLIST_ENTRY_DESTROY(bif, bif_next); 765 kmem_free(bif, sizeof(*bif)); 766 767 BRIDGE_LOCK(sc); 768 } 769 770 /* 771 * bridge_calc_csum_flags: 772 * 773 * Calculate logical and b/w csum flags each member interface supports. 774 */ 775 void 776 bridge_calc_csum_flags(struct bridge_softc *sc) 777 { 778 struct bridge_iflist *bif; 779 struct ifnet *ifs = NULL; 780 int flags = ~0; 781 int capenable = ~0; 782 783 BRIDGE_LOCK(sc); 784 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 785 ifs = bif->bif_ifp; 786 flags &= ifs->if_csum_flags_tx; 787 capenable &= ifs->if_capenable; 788 } 789 sc->sc_csum_flags_tx = flags; 790 sc->sc_capenable = (ifs != NULL) ? capenable : 0; 791 BRIDGE_UNLOCK(sc); 792 } 793 794 /* 795 * bridge_calc_link_state: 796 * 797 * Calculate the link state based on each member interface. 798 */ 799 void 800 bridge_calc_link_state(struct bridge_softc *sc) 801 { 802 struct bridge_iflist *bif; 803 struct ifnet *ifs; 804 int link_state = LINK_STATE_DOWN; 805 806 BRIDGE_LOCK(sc); 807 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 808 ifs = bif->bif_ifp; 809 if (ifs->if_link_state == LINK_STATE_UP) { 810 link_state = LINK_STATE_UP; 811 break; 812 } 813 if (ifs->if_link_state == LINK_STATE_UNKNOWN) 814 link_state = LINK_STATE_UNKNOWN; 815 } 816 if_link_state_change(&sc->sc_if, link_state); 817 BRIDGE_UNLOCK(sc); 818 } 819 820 static int 821 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 822 { 823 struct ifbreq *req = arg; 824 struct bridge_iflist *bif = NULL; 825 struct ifnet *ifs; 826 int error = 0; 827 struct psref psref; 828 829 ifs = if_get(req->ifbr_ifsname, &psref); 830 if (ifs == NULL) 831 return ENOENT; 832 833 if (ifs->if_bridge == sc) { 834 error = EEXIST; 835 goto out; 836 } 837 838 if (ifs->if_bridge != NULL) { 839 error = EBUSY; 840 goto out; 841 } 842 843 if (ifs->_if_input != ether_input) { 844 error = EINVAL; 845 goto out; 846 } 847 848 /* FIXME: doesn't work with non-IFF_SIMPLEX interfaces */ 849 if ((ifs->if_flags & IFF_SIMPLEX) == 0) { 850 error = EINVAL; 851 goto out; 852 } 853 854 bif = kmem_alloc(sizeof(*bif), KM_SLEEP); 855 856 switch (ifs->if_type) { 857 case IFT_ETHER: 858 if (sc->sc_if.if_mtu != ifs->if_mtu) { 859 /* Change MTU of added interface to bridge MTU */ 860 struct ifreq ifr; 861 memset(&ifr, 0, sizeof(ifr)); 862 ifr.ifr_mtu = sc->sc_if.if_mtu; 863 IFNET_LOCK(ifs); 864 error = ether_ioctl(ifs, SIOCSIFMTU, &ifr); 865 IFNET_UNLOCK(ifs); 866 if (error != 0) 867 goto out; 868 } 869 /* FALLTHROUGH */ 870 case IFT_L2TP: 871 IFNET_LOCK(ifs); 872 error = ether_enable_vlan_mtu(ifs); 873 IFNET_UNLOCK(ifs); 874 if (error > 0) 875 goto out; 876 /* 877 * Place the interface into promiscuous mode. 878 */ 879 error = ifpromisc(ifs, 1); 880 if (error) 881 goto out; 882 break; 883 default: 884 error = EINVAL; 885 goto out; 886 } 887 888 bif->bif_ifp = ifs; 889 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 890 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 891 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 892 PSLIST_ENTRY_INIT(bif, bif_next); 893 psref_target_init(&bif->bif_psref, bridge_psref_class); 894 895 BRIDGE_LOCK(sc); 896 897 ifs->if_bridge = sc; 898 ifs->if_bridgeif = bif; 899 PSLIST_WRITER_INSERT_HEAD(&sc->sc_iflist_psref.bip_iflist, bif, bif_next); 900 ifs->_if_input = bridge_input; 901 902 BRIDGE_UNLOCK(sc); 903 904 bridge_calc_csum_flags(sc); 905 bridge_calc_link_state(sc); 906 907 if (sc->sc_if.if_flags & IFF_RUNNING) 908 bstp_initialization(sc); 909 else 910 bstp_stop(sc); 911 912 out: 913 if_put(ifs, &psref); 914 if (error) { 915 if (bif != NULL) 916 kmem_free(bif, sizeof(*bif)); 917 } 918 return error; 919 } 920 921 static int 922 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 923 { 924 struct ifbreq *req = arg; 925 const char *name = req->ifbr_ifsname; 926 struct bridge_iflist *bif; 927 struct ifnet *ifs; 928 929 BRIDGE_LOCK(sc); 930 931 /* 932 * Don't use bridge_lookup_member. We want to get a member 933 * with bif_refs == 0. 934 */ 935 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 936 ifs = bif->bif_ifp; 937 if (strcmp(ifs->if_xname, name) == 0) 938 break; 939 } 940 941 if (bif == NULL) { 942 BRIDGE_UNLOCK(sc); 943 return ENOENT; 944 } 945 946 bridge_delete_member(sc, bif); 947 948 BRIDGE_UNLOCK(sc); 949 950 bridge_rtdelete(sc, ifs); 951 bridge_calc_csum_flags(sc); 952 bridge_calc_link_state(sc); 953 954 if (sc->sc_if.if_flags & IFF_RUNNING) 955 bstp_initialization(sc); 956 957 return 0; 958 } 959 960 static int 961 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 962 { 963 struct ifbreq *req = arg; 964 struct bridge_iflist *bif; 965 struct psref psref; 966 967 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 968 if (bif == NULL) 969 return ENOENT; 970 971 req->ifbr_ifsflags = bif->bif_flags; 972 req->ifbr_state = bif->bif_state; 973 req->ifbr_priority = bif->bif_priority; 974 req->ifbr_path_cost = bif->bif_path_cost; 975 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 976 977 bridge_release_member(sc, bif, &psref); 978 979 return 0; 980 } 981 982 static int 983 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 984 { 985 struct ifbreq *req = arg; 986 struct bridge_iflist *bif; 987 struct psref psref; 988 989 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 990 if (bif == NULL) 991 return ENOENT; 992 993 if (req->ifbr_ifsflags & IFBIF_STP) { 994 switch (bif->bif_ifp->if_type) { 995 case IFT_ETHER: 996 case IFT_L2TP: 997 /* These can do spanning tree. */ 998 break; 999 1000 default: 1001 /* Nothing else can. */ 1002 bridge_release_member(sc, bif, &psref); 1003 return EINVAL; 1004 } 1005 } 1006 1007 bif->bif_flags = req->ifbr_ifsflags; 1008 1009 bridge_release_member(sc, bif, &psref); 1010 1011 if (sc->sc_if.if_flags & IFF_RUNNING) 1012 bstp_initialization(sc); 1013 1014 return 0; 1015 } 1016 1017 static int 1018 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1019 { 1020 struct ifbrparam *param = arg; 1021 1022 sc->sc_brtmax = param->ifbrp_csize; 1023 bridge_rttrim(sc); 1024 1025 return 0; 1026 } 1027 1028 static int 1029 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1030 { 1031 struct ifbrparam *param = arg; 1032 1033 param->ifbrp_csize = sc->sc_brtmax; 1034 1035 return 0; 1036 } 1037 1038 static int 1039 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1040 { 1041 struct ifbifconf *bifc = arg; 1042 struct bridge_iflist *bif; 1043 struct ifbreq *breqs; 1044 int i, count, error = 0; 1045 1046 retry: 1047 BRIDGE_LOCK(sc); 1048 count = 0; 1049 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 1050 count++; 1051 BRIDGE_UNLOCK(sc); 1052 1053 if (count == 0) { 1054 bifc->ifbic_len = 0; 1055 return 0; 1056 } 1057 1058 if (bifc->ifbic_len == 0 || bifc->ifbic_len < (sizeof(*breqs) * count)) { 1059 /* Tell that a larger buffer is needed */ 1060 bifc->ifbic_len = sizeof(*breqs) * count; 1061 return 0; 1062 } 1063 1064 breqs = kmem_alloc(sizeof(*breqs) * count, KM_SLEEP); 1065 1066 BRIDGE_LOCK(sc); 1067 1068 i = 0; 1069 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 1070 i++; 1071 if (i > count) { 1072 /* 1073 * The number of members has been increased. 1074 * We need more memory! 1075 */ 1076 BRIDGE_UNLOCK(sc); 1077 kmem_free(breqs, sizeof(*breqs) * count); 1078 goto retry; 1079 } 1080 1081 i = 0; 1082 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 1083 struct ifbreq *breq = &breqs[i++]; 1084 memset(breq, 0, sizeof(*breq)); 1085 1086 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, 1087 sizeof(breq->ifbr_ifsname)); 1088 breq->ifbr_ifsflags = bif->bif_flags; 1089 breq->ifbr_state = bif->bif_state; 1090 breq->ifbr_priority = bif->bif_priority; 1091 breq->ifbr_path_cost = bif->bif_path_cost; 1092 breq->ifbr_portno = bif->bif_ifp->if_index & 0xff; 1093 } 1094 1095 /* Don't call copyout with holding the mutex */ 1096 BRIDGE_UNLOCK(sc); 1097 1098 for (i = 0; i < count; i++) { 1099 error = copyout(&breqs[i], bifc->ifbic_req + i, sizeof(*breqs)); 1100 if (error) 1101 break; 1102 } 1103 bifc->ifbic_len = sizeof(*breqs) * i; 1104 1105 kmem_free(breqs, sizeof(*breqs) * count); 1106 1107 return error; 1108 } 1109 1110 static int 1111 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1112 { 1113 struct ifbaconf *bac = arg; 1114 struct bridge_rtnode *brt; 1115 struct ifbareq bareq; 1116 int count = 0, error = 0, len; 1117 1118 if (bac->ifbac_len == 0) 1119 return 0; 1120 1121 BRIDGE_RT_LOCK(sc); 1122 1123 /* The passed buffer is not enough, tell a required size. */ 1124 if (bac->ifbac_len < (sizeof(bareq) * sc->sc_brtcnt)) { 1125 count = sc->sc_brtcnt; 1126 goto out; 1127 } 1128 1129 len = bac->ifbac_len; 1130 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 1131 if (len < sizeof(bareq)) 1132 goto out; 1133 memset(&bareq, 0, sizeof(bareq)); 1134 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1135 sizeof(bareq.ifba_ifsname)); 1136 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1137 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1138 bareq.ifba_expire = brt->brt_expire - time_uptime; 1139 } else 1140 bareq.ifba_expire = 0; 1141 bareq.ifba_flags = brt->brt_flags; 1142 1143 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1144 if (error) 1145 goto out; 1146 count++; 1147 len -= sizeof(bareq); 1148 } 1149 out: 1150 BRIDGE_RT_UNLOCK(sc); 1151 1152 bac->ifbac_len = sizeof(bareq) * count; 1153 return error; 1154 } 1155 1156 static int 1157 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1158 { 1159 struct ifbareq *req = arg; 1160 struct bridge_iflist *bif; 1161 int error; 1162 struct psref psref; 1163 1164 bif = bridge_lookup_member(sc, req->ifba_ifsname, &psref); 1165 if (bif == NULL) 1166 return ENOENT; 1167 1168 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1169 req->ifba_flags); 1170 1171 bridge_release_member(sc, bif, &psref); 1172 1173 return error; 1174 } 1175 1176 static int 1177 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1178 { 1179 struct ifbrparam *param = arg; 1180 1181 sc->sc_brttimeout = param->ifbrp_ctime; 1182 1183 return 0; 1184 } 1185 1186 static int 1187 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1188 { 1189 struct ifbrparam *param = arg; 1190 1191 param->ifbrp_ctime = sc->sc_brttimeout; 1192 1193 return 0; 1194 } 1195 1196 static int 1197 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1198 { 1199 struct ifbareq *req = arg; 1200 1201 return (bridge_rtdaddr(sc, req->ifba_dst)); 1202 } 1203 1204 static int 1205 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1206 { 1207 struct ifbreq *req = arg; 1208 1209 bridge_rtflush(sc, req->ifbr_ifsflags); 1210 1211 return 0; 1212 } 1213 1214 static int 1215 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1216 { 1217 struct ifbrparam *param = arg; 1218 1219 param->ifbrp_prio = sc->sc_bridge_priority; 1220 1221 return 0; 1222 } 1223 1224 static int 1225 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1226 { 1227 struct ifbrparam *param = arg; 1228 1229 sc->sc_bridge_priority = param->ifbrp_prio; 1230 1231 if (sc->sc_if.if_flags & IFF_RUNNING) 1232 bstp_initialization(sc); 1233 1234 return 0; 1235 } 1236 1237 static int 1238 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1239 { 1240 struct ifbrparam *param = arg; 1241 1242 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1243 1244 return 0; 1245 } 1246 1247 static int 1248 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1249 { 1250 struct ifbrparam *param = arg; 1251 1252 if (param->ifbrp_hellotime == 0) 1253 return EINVAL; 1254 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1255 1256 if (sc->sc_if.if_flags & IFF_RUNNING) 1257 bstp_initialization(sc); 1258 1259 return 0; 1260 } 1261 1262 static int 1263 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1264 { 1265 struct ifbrparam *param = arg; 1266 1267 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1268 1269 return 0; 1270 } 1271 1272 static int 1273 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1274 { 1275 struct ifbrparam *param = arg; 1276 1277 if (param->ifbrp_fwddelay == 0) 1278 return EINVAL; 1279 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1280 1281 if (sc->sc_if.if_flags & IFF_RUNNING) 1282 bstp_initialization(sc); 1283 1284 return 0; 1285 } 1286 1287 static int 1288 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1289 { 1290 struct ifbrparam *param = arg; 1291 1292 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1293 1294 return 0; 1295 } 1296 1297 static int 1298 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1299 { 1300 struct ifbrparam *param = arg; 1301 1302 if (param->ifbrp_maxage == 0) 1303 return EINVAL; 1304 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1305 1306 if (sc->sc_if.if_flags & IFF_RUNNING) 1307 bstp_initialization(sc); 1308 1309 return 0; 1310 } 1311 1312 static int 1313 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1314 { 1315 struct ifbreq *req = arg; 1316 struct bridge_iflist *bif; 1317 struct psref psref; 1318 1319 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1320 if (bif == NULL) 1321 return ENOENT; 1322 1323 bif->bif_priority = req->ifbr_priority; 1324 1325 if (sc->sc_if.if_flags & IFF_RUNNING) 1326 bstp_initialization(sc); 1327 1328 bridge_release_member(sc, bif, &psref); 1329 1330 return 0; 1331 } 1332 1333 static int 1334 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1335 { 1336 struct ifbrparam *param = arg; 1337 1338 param->ifbrp_filter = sc->sc_filter_flags; 1339 1340 return 0; 1341 } 1342 1343 static int 1344 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1345 { 1346 struct ifbrparam *param = arg; 1347 uint32_t nflags, oflags; 1348 1349 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1350 return EINVAL; 1351 1352 nflags = param->ifbrp_filter; 1353 oflags = sc->sc_filter_flags; 1354 1355 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1356 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1357 sc->sc_if.if_pfil); 1358 } 1359 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1360 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1361 sc->sc_if.if_pfil); 1362 } 1363 1364 sc->sc_filter_flags = nflags; 1365 1366 return 0; 1367 } 1368 1369 static int 1370 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1371 { 1372 struct ifbreq *req = arg; 1373 struct bridge_iflist *bif; 1374 struct psref psref; 1375 1376 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1377 if (bif == NULL) 1378 return ENOENT; 1379 1380 bif->bif_path_cost = req->ifbr_path_cost; 1381 1382 if (sc->sc_if.if_flags & IFF_RUNNING) 1383 bstp_initialization(sc); 1384 1385 bridge_release_member(sc, bif, &psref); 1386 1387 return 0; 1388 } 1389 1390 /* 1391 * bridge_ifdetach: 1392 * 1393 * Detach an interface from a bridge. Called when a member 1394 * interface is detaching. 1395 */ 1396 void 1397 bridge_ifdetach(struct ifnet *ifp) 1398 { 1399 struct bridge_softc *sc = ifp->if_bridge; 1400 struct ifbreq breq; 1401 1402 /* ioctl_lock should prevent this from happening */ 1403 KASSERT(sc != NULL); 1404 1405 memset(&breq, 0, sizeof(breq)); 1406 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1407 1408 (void) bridge_ioctl_del(sc, &breq); 1409 } 1410 1411 /* 1412 * bridge_init: 1413 * 1414 * Initialize a bridge interface. 1415 */ 1416 static int 1417 bridge_init(struct ifnet *ifp) 1418 { 1419 struct bridge_softc *sc = ifp->if_softc; 1420 1421 KASSERT((ifp->if_flags & IFF_RUNNING) == 0); 1422 1423 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1424 bridge_timer, sc); 1425 bstp_initialization(sc); 1426 1427 ifp->if_flags |= IFF_RUNNING; 1428 return 0; 1429 } 1430 1431 /* 1432 * bridge_stop: 1433 * 1434 * Stop the bridge interface. 1435 */ 1436 static void 1437 bridge_stop(struct ifnet *ifp, int disable) 1438 { 1439 struct bridge_softc *sc = ifp->if_softc; 1440 1441 KASSERT((ifp->if_flags & IFF_RUNNING) != 0); 1442 ifp->if_flags &= ~IFF_RUNNING; 1443 1444 callout_halt(&sc->sc_brcallout, NULL); 1445 workqueue_wait(sc->sc_rtage_wq, &sc->sc_rtage_wk); 1446 bstp_stop(sc); 1447 bridge_rtflush(sc, IFBF_FLUSHDYN); 1448 } 1449 1450 /* 1451 * bridge_enqueue: 1452 * 1453 * Enqueue a packet on a bridge member interface. 1454 */ 1455 void 1456 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1457 int runfilt) 1458 { 1459 int len, error; 1460 short mflags; 1461 1462 if (runfilt) { 1463 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1464 dst_ifp, PFIL_OUT) != 0) { 1465 if (m != NULL) 1466 m_freem(m); 1467 return; 1468 } 1469 if (m == NULL) 1470 return; 1471 } 1472 1473 #ifdef ALTQ 1474 KERNEL_LOCK(1, NULL); 1475 /* 1476 * If ALTQ is enabled on the member interface, do 1477 * classification; the queueing discipline might 1478 * not require classification, but might require 1479 * the address family/header pointer in the pktattr. 1480 */ 1481 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1482 /* XXX IFT_ETHER */ 1483 altq_etherclassify(&dst_ifp->if_snd, m); 1484 } 1485 KERNEL_UNLOCK_ONE(NULL); 1486 #endif /* ALTQ */ 1487 1488 len = m->m_pkthdr.len; 1489 mflags = m->m_flags; 1490 1491 error = if_transmit_lock(dst_ifp, m); 1492 if (error) { 1493 /* mbuf is already freed */ 1494 if_statinc(&sc->sc_if, if_oerrors); 1495 return; 1496 } 1497 1498 net_stat_ref_t nsr = IF_STAT_GETREF(&sc->sc_if); 1499 if_statinc_ref(nsr, if_opackets); 1500 if_statadd_ref(nsr, if_obytes, len); 1501 if (mflags & M_MCAST) 1502 if_statinc_ref(nsr, if_omcasts); 1503 IF_STAT_PUTREF(&sc->sc_if); 1504 } 1505 1506 /* 1507 * bridge_output: 1508 * 1509 * Send output from a bridge member interface. This 1510 * performs the bridging function for locally originated 1511 * packets. 1512 * 1513 * The mbuf has the Ethernet header already attached. We must 1514 * enqueue or free the mbuf before returning. 1515 */ 1516 int 1517 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1518 const struct rtentry *rt) 1519 { 1520 struct ether_header *eh; 1521 struct ifnet *dst_if; 1522 struct bridge_softc *sc; 1523 struct mbuf *n; 1524 int s; 1525 1526 /* 1527 * bridge_output() is called from ether_output(), furthermore 1528 * ifp argument doesn't point to bridge(4). So, don't assert 1529 * IFEF_MPSAFE here. 1530 */ 1531 1532 KASSERT(m->m_len >= ETHER_HDR_LEN); 1533 1534 eh = mtod(m, struct ether_header *); 1535 sc = ifp->if_bridge; 1536 1537 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1538 if (memcmp(etherbroadcastaddr, 1539 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1540 m->m_flags |= M_BCAST; 1541 else 1542 m->m_flags |= M_MCAST; 1543 } 1544 1545 /* 1546 * If bridge is down, but the original output interface is up, 1547 * go ahead and send out that interface. Otherwise, the packet 1548 * is dropped below. 1549 */ 1550 if (__predict_false(sc == NULL) || 1551 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1552 dst_if = ifp; 1553 goto unicast_asis; 1554 } 1555 1556 /* 1557 * If the packet is a multicast, or we don't know a better way to 1558 * get there, send to all interfaces. 1559 */ 1560 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0) 1561 dst_if = NULL; 1562 else 1563 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1564 1565 /* 1566 * In general, we need to handle TX offload in software before 1567 * enqueueing a packet. However, we can send it as is in the 1568 * cases of unicast via (1) the source interface, or (2) an 1569 * interface which supports the specified offload options. 1570 * For multicast or broadcast, send it as is only if (3) all 1571 * the member interfaces support the specified options. 1572 */ 1573 1574 /* 1575 * Unicast via the source interface. 1576 */ 1577 if (dst_if == ifp) 1578 goto unicast_asis; 1579 1580 /* 1581 * Unicast via other interface. 1582 */ 1583 if (dst_if != NULL) { 1584 KASSERT(m->m_flags & M_PKTHDR); 1585 if (TX_OFFLOAD_SUPPORTED(dst_if->if_csum_flags_tx, 1586 m->m_pkthdr.csum_flags)) { 1587 /* 1588 * Unicast via an interface which supports the 1589 * specified offload options. 1590 */ 1591 goto unicast_asis; 1592 } 1593 1594 /* 1595 * Handle TX offload in software. For TSO, a packet is 1596 * split into multiple chunks. Thus, the return value of 1597 * ether_sw_offload_tx() is mbuf queue consists of them. 1598 */ 1599 m = ether_sw_offload_tx(ifp, m); 1600 if (m == NULL) 1601 return 0; 1602 1603 do { 1604 n = m->m_nextpkt; 1605 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1606 m_freem(m); 1607 else 1608 bridge_enqueue(sc, dst_if, m, 0); 1609 m = n; 1610 } while (m != NULL); 1611 1612 return 0; 1613 } 1614 1615 /* 1616 * Multicast or broadcast. 1617 */ 1618 if (TX_OFFLOAD_SUPPORTED(sc->sc_csum_flags_tx, 1619 m->m_pkthdr.csum_flags)) { 1620 /* 1621 * Specified TX offload options are supported by all 1622 * the member interfaces of this bridge. 1623 */ 1624 m->m_nextpkt = NULL; /* XXX */ 1625 } else { 1626 /* 1627 * Otherwise, handle TX offload in software. 1628 */ 1629 m = ether_sw_offload_tx(ifp, m); 1630 if (m == NULL) 1631 return 0; 1632 } 1633 1634 do { 1635 /* XXX Should call bridge_broadcast, but there are locking 1636 * issues which need resolving first. */ 1637 struct bridge_iflist *bif; 1638 struct mbuf *mc; 1639 bool used = false; 1640 1641 n = m->m_nextpkt; 1642 1643 BRIDGE_PSZ_RENTER(s); 1644 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1645 struct psref psref; 1646 1647 bridge_acquire_member(sc, bif, &psref); 1648 BRIDGE_PSZ_REXIT(s); 1649 1650 dst_if = bif->bif_ifp; 1651 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1652 goto next; 1653 1654 /* 1655 * If this is not the original output interface, 1656 * and the interface is participating in spanning 1657 * tree, make sure the port is in a state that 1658 * allows forwarding. 1659 */ 1660 if (dst_if != ifp && 1661 (bif->bif_flags & IFBIF_STP) != 0) { 1662 switch (bif->bif_state) { 1663 case BSTP_IFSTATE_BLOCKING: 1664 case BSTP_IFSTATE_LISTENING: 1665 case BSTP_IFSTATE_DISABLED: 1666 goto next; 1667 } 1668 } 1669 1670 if (PSLIST_READER_NEXT(bif, struct bridge_iflist, 1671 bif_next) == NULL && 1672 ((m->m_flags & (M_MCAST | M_BCAST)) == 0 || 1673 dst_if == ifp)) 1674 { 1675 used = true; 1676 mc = m; 1677 } else { 1678 mc = m_copypacket(m, M_DONTWAIT); 1679 if (mc == NULL) { 1680 if_statinc(&sc->sc_if, if_oerrors); 1681 goto next; 1682 } 1683 } 1684 1685 bridge_enqueue(sc, dst_if, mc, 0); 1686 1687 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0 && 1688 dst_if != ifp) 1689 { 1690 if (PSLIST_READER_NEXT(bif, 1691 struct bridge_iflist, bif_next) == NULL) 1692 { 1693 used = true; 1694 mc = m; 1695 } else { 1696 mc = m_copypacket(m, M_DONTWAIT); 1697 if (mc == NULL) { 1698 if_statinc(&sc->sc_if, 1699 if_oerrors); 1700 goto next; 1701 } 1702 } 1703 1704 m_set_rcvif(mc, dst_if); 1705 mc->m_flags &= ~M_PROMISC; 1706 1707 s = splsoftnet(); 1708 KERNEL_LOCK_UNLESS_IFP_MPSAFE(dst_if); 1709 ether_input(dst_if, mc); 1710 KERNEL_UNLOCK_UNLESS_IFP_MPSAFE(dst_if); 1711 splx(s); 1712 } 1713 1714 next: 1715 BRIDGE_PSZ_RENTER(s); 1716 bridge_release_member(sc, bif, &psref); 1717 1718 /* Guarantee we don't re-enter the loop as we already 1719 * decided we're at the end. */ 1720 if (used) 1721 break; 1722 } 1723 BRIDGE_PSZ_REXIT(s); 1724 1725 if (!used) 1726 m_freem(m); 1727 1728 m = n; 1729 } while (m != NULL); 1730 return 0; 1731 1732 unicast_asis: 1733 /* 1734 * XXX Spanning tree consideration here? 1735 */ 1736 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1737 m_freem(m); 1738 else 1739 bridge_enqueue(sc, dst_if, m, 0); 1740 return 0; 1741 } 1742 1743 /* 1744 * bridge_start: 1745 * 1746 * Start output on a bridge. 1747 * 1748 * NOTE: This routine should never be called in this implementation. 1749 */ 1750 static void 1751 bridge_start(struct ifnet *ifp) 1752 { 1753 1754 printf("%s: bridge_start() called\n", ifp->if_xname); 1755 } 1756 1757 /* 1758 * bridge_forward: 1759 * 1760 * The forwarding function of the bridge. 1761 */ 1762 static void 1763 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1764 { 1765 struct bridge_iflist *bif; 1766 struct ifnet *src_if, *dst_if; 1767 struct ether_header *eh; 1768 struct psref psref; 1769 struct psref psref_src; 1770 DECLARE_LOCK_VARIABLE; 1771 1772 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1773 return; 1774 1775 src_if = m_get_rcvif_psref(m, &psref_src); 1776 if (src_if == NULL) { 1777 /* Interface is being destroyed? */ 1778 m_freem(m); 1779 goto out; 1780 } 1781 1782 if_statadd2(&sc->sc_if, if_ipackets, 1, if_ibytes, m->m_pkthdr.len); 1783 1784 /* 1785 * Look up the bridge_iflist. 1786 */ 1787 bif = bridge_lookup_member_if(sc, src_if, &psref); 1788 if (bif == NULL) { 1789 /* Interface is not a bridge member (anymore?) */ 1790 m_freem(m); 1791 goto out; 1792 } 1793 1794 if (bif->bif_flags & IFBIF_STP) { 1795 switch (bif->bif_state) { 1796 case BSTP_IFSTATE_BLOCKING: 1797 case BSTP_IFSTATE_LISTENING: 1798 case BSTP_IFSTATE_DISABLED: 1799 m_freem(m); 1800 bridge_release_member(sc, bif, &psref); 1801 goto out; 1802 } 1803 } 1804 1805 eh = mtod(m, struct ether_header *); 1806 1807 /* 1808 * If the interface is learning, and the source 1809 * address is valid and not multicast, record 1810 * the address. 1811 */ 1812 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1813 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1814 (eh->ether_shost[0] == 0 && 1815 eh->ether_shost[1] == 0 && 1816 eh->ether_shost[2] == 0 && 1817 eh->ether_shost[3] == 0 && 1818 eh->ether_shost[4] == 0 && 1819 eh->ether_shost[5] == 0) == 0) { 1820 (void) bridge_rtupdate(sc, eh->ether_shost, 1821 src_if, 0, IFBAF_DYNAMIC); 1822 } 1823 1824 if ((bif->bif_flags & IFBIF_STP) != 0 && 1825 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1826 m_freem(m); 1827 bridge_release_member(sc, bif, &psref); 1828 goto out; 1829 } 1830 1831 bridge_release_member(sc, bif, &psref); 1832 1833 /* 1834 * At this point, the port either doesn't participate 1835 * in spanning tree or it is in the forwarding state. 1836 */ 1837 1838 /* 1839 * If the packet is unicast, destined for someone on 1840 * "this" side of the bridge, drop it. 1841 */ 1842 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1843 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1844 if (src_if == dst_if) { 1845 m_freem(m); 1846 goto out; 1847 } 1848 } else { 1849 /* ...forward it to all interfaces. */ 1850 if_statinc(&sc->sc_if, if_imcasts); 1851 dst_if = NULL; 1852 } 1853 1854 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, src_if, PFIL_IN) != 0) { 1855 if (m != NULL) 1856 m_freem(m); 1857 goto out; 1858 } 1859 if (m == NULL) 1860 goto out; 1861 1862 if (dst_if == NULL) { 1863 bridge_broadcast(sc, src_if, m); 1864 goto out; 1865 } 1866 1867 m_put_rcvif_psref(src_if, &psref_src); 1868 src_if = NULL; 1869 1870 /* 1871 * At this point, we're dealing with a unicast frame 1872 * going to a different interface. 1873 */ 1874 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1875 m_freem(m); 1876 goto out; 1877 } 1878 1879 bif = bridge_lookup_member_if(sc, dst_if, &psref); 1880 if (bif == NULL) { 1881 /* Not a member of the bridge (anymore?) */ 1882 m_freem(m); 1883 goto out; 1884 } 1885 1886 if (bif->bif_flags & IFBIF_STP) { 1887 switch (bif->bif_state) { 1888 case BSTP_IFSTATE_DISABLED: 1889 case BSTP_IFSTATE_BLOCKING: 1890 m_freem(m); 1891 bridge_release_member(sc, bif, &psref); 1892 goto out; 1893 } 1894 } 1895 1896 bridge_release_member(sc, bif, &psref); 1897 1898 /* 1899 * Before enqueueing this packet to the destination interface, 1900 * clear any in-bound checksum flags to prevent them from being 1901 * misused as out-bound flags. 1902 */ 1903 m->m_pkthdr.csum_flags = 0; 1904 1905 ACQUIRE_GLOBAL_LOCKS(); 1906 bridge_enqueue(sc, dst_if, m, 1); 1907 RELEASE_GLOBAL_LOCKS(); 1908 out: 1909 if (src_if != NULL) 1910 m_put_rcvif_psref(src_if, &psref_src); 1911 return; 1912 } 1913 1914 static bool 1915 bstp_state_before_learning(struct bridge_iflist *bif) 1916 { 1917 if (bif->bif_flags & IFBIF_STP) { 1918 switch (bif->bif_state) { 1919 case BSTP_IFSTATE_BLOCKING: 1920 case BSTP_IFSTATE_LISTENING: 1921 case BSTP_IFSTATE_DISABLED: 1922 return true; 1923 } 1924 } 1925 return false; 1926 } 1927 1928 static bool 1929 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1930 { 1931 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1932 1933 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1934 #if NCARP > 0 1935 || (bif->bif_ifp->if_carp && 1936 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1937 #endif /* NCARP > 0 */ 1938 ) 1939 return true; 1940 1941 return false; 1942 } 1943 1944 /* 1945 * bridge_input: 1946 * 1947 * Receive input from a member interface. Queue the packet for 1948 * bridging if it is not for us. 1949 */ 1950 static void 1951 bridge_input(struct ifnet *ifp, struct mbuf *m) 1952 { 1953 struct bridge_softc *sc = ifp->if_bridge; 1954 struct bridge_iflist *bif; 1955 struct ether_header *eh; 1956 struct psref psref; 1957 int bound; 1958 DECLARE_LOCK_VARIABLE; 1959 1960 KASSERT(!cpu_intr_p()); 1961 1962 if (__predict_false(sc == NULL) || 1963 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1964 ACQUIRE_GLOBAL_LOCKS(); 1965 ether_input(ifp, m); 1966 RELEASE_GLOBAL_LOCKS(); 1967 return; 1968 } 1969 1970 bound = curlwp_bind(); 1971 bif = bridge_lookup_member_if(sc, ifp, &psref); 1972 if (bif == NULL) { 1973 curlwp_bindx(bound); 1974 ACQUIRE_GLOBAL_LOCKS(); 1975 ether_input(ifp, m); 1976 RELEASE_GLOBAL_LOCKS(); 1977 return; 1978 } 1979 1980 eh = mtod(m, struct ether_header *); 1981 1982 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1983 if (memcmp(etherbroadcastaddr, 1984 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1985 m->m_flags |= M_BCAST; 1986 else 1987 m->m_flags |= M_MCAST; 1988 } 1989 1990 /* 1991 * A 'fast' path for packets addressed to interfaces that are 1992 * part of this bridge. 1993 */ 1994 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 1995 !bstp_state_before_learning(bif)) { 1996 struct bridge_iflist *_bif; 1997 struct ifnet *_ifp = NULL; 1998 int s; 1999 struct psref _psref; 2000 2001 BRIDGE_PSZ_RENTER(s); 2002 BRIDGE_IFLIST_READER_FOREACH(_bif, sc) { 2003 /* It is destined for us. */ 2004 if (bridge_ourether(_bif, eh, 0)) { 2005 bridge_acquire_member(sc, _bif, &_psref); 2006 BRIDGE_PSZ_REXIT(s); 2007 if (_bif->bif_flags & IFBIF_LEARNING) 2008 (void) bridge_rtupdate(sc, 2009 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 2010 m_set_rcvif(m, _bif->bif_ifp); 2011 _ifp = _bif->bif_ifp; 2012 bridge_release_member(sc, _bif, &_psref); 2013 goto out; 2014 } 2015 2016 /* We just received a packet that we sent out. */ 2017 if (bridge_ourether(_bif, eh, 1)) 2018 break; 2019 } 2020 BRIDGE_PSZ_REXIT(s); 2021 out: 2022 2023 if (_bif != NULL) { 2024 bridge_release_member(sc, bif, &psref); 2025 curlwp_bindx(bound); 2026 if (_ifp != NULL) { 2027 m->m_flags &= ~M_PROMISC; 2028 ACQUIRE_GLOBAL_LOCKS(); 2029 ether_input(_ifp, m); 2030 RELEASE_GLOBAL_LOCKS(); 2031 } else 2032 m_freem(m); 2033 return; 2034 } 2035 } 2036 2037 /* Tap off 802.1D packets; they do not get forwarded. */ 2038 if (bif->bif_flags & IFBIF_STP && 2039 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 2040 bstp_input(sc, bif, m); 2041 bridge_release_member(sc, bif, &psref); 2042 curlwp_bindx(bound); 2043 return; 2044 } 2045 2046 /* 2047 * A normal switch would discard the packet here, but that's not what 2048 * we've done historically. This also prevents some obnoxious behaviour. 2049 */ 2050 if (bstp_state_before_learning(bif)) { 2051 bridge_release_member(sc, bif, &psref); 2052 curlwp_bindx(bound); 2053 ACQUIRE_GLOBAL_LOCKS(); 2054 ether_input(ifp, m); 2055 RELEASE_GLOBAL_LOCKS(); 2056 return; 2057 } 2058 2059 bridge_release_member(sc, bif, &psref); 2060 2061 bridge_forward(sc, m); 2062 2063 curlwp_bindx(bound); 2064 } 2065 2066 /* 2067 * bridge_broadcast: 2068 * 2069 * Send a frame to all interfaces that are members of 2070 * the bridge, except for the one on which the packet 2071 * arrived. 2072 */ 2073 static void 2074 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2075 struct mbuf *m) 2076 { 2077 struct bridge_iflist *bif; 2078 struct mbuf *mc; 2079 struct ifnet *dst_if; 2080 bool bmcast; 2081 int s; 2082 DECLARE_LOCK_VARIABLE; 2083 2084 bmcast = m->m_flags & (M_BCAST|M_MCAST); 2085 2086 BRIDGE_PSZ_RENTER(s); 2087 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 2088 struct psref psref; 2089 2090 bridge_acquire_member(sc, bif, &psref); 2091 BRIDGE_PSZ_REXIT(s); 2092 2093 dst_if = bif->bif_ifp; 2094 2095 if (bif->bif_flags & IFBIF_STP) { 2096 switch (bif->bif_state) { 2097 case BSTP_IFSTATE_BLOCKING: 2098 case BSTP_IFSTATE_DISABLED: 2099 goto next; 2100 } 2101 } 2102 2103 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 2104 goto next; 2105 2106 if ((dst_if->if_flags & IFF_RUNNING) == 0) 2107 goto next; 2108 2109 if (dst_if != src_if) { 2110 mc = m_copypacket(m, M_DONTWAIT); 2111 if (mc == NULL) { 2112 if_statinc(&sc->sc_if, if_oerrors); 2113 goto next; 2114 } 2115 /* 2116 * Before enqueueing this packet to the destination 2117 * interface, clear any in-bound checksum flags to 2118 * prevent them from being misused as out-bound flags. 2119 */ 2120 mc->m_pkthdr.csum_flags = 0; 2121 2122 ACQUIRE_GLOBAL_LOCKS(); 2123 bridge_enqueue(sc, dst_if, mc, 1); 2124 RELEASE_GLOBAL_LOCKS(); 2125 } 2126 2127 if (bmcast) { 2128 mc = m_copypacket(m, M_DONTWAIT); 2129 if (mc == NULL) { 2130 if_statinc(&sc->sc_if, if_oerrors); 2131 goto next; 2132 } 2133 /* 2134 * Before enqueueing this packet to the destination 2135 * interface, clear any in-bound checksum flags to 2136 * prevent them from being misused as out-bound flags. 2137 */ 2138 mc->m_pkthdr.csum_flags = 0; 2139 2140 m_set_rcvif(mc, dst_if); 2141 mc->m_flags &= ~M_PROMISC; 2142 2143 ACQUIRE_GLOBAL_LOCKS(); 2144 ether_input(dst_if, mc); 2145 RELEASE_GLOBAL_LOCKS(); 2146 } 2147 next: 2148 BRIDGE_PSZ_RENTER(s); 2149 bridge_release_member(sc, bif, &psref); 2150 } 2151 BRIDGE_PSZ_REXIT(s); 2152 2153 m_freem(m); 2154 } 2155 2156 static int 2157 bridge_rtalloc(struct bridge_softc *sc, const uint8_t *dst, 2158 struct bridge_rtnode **brtp) 2159 { 2160 struct bridge_rtnode *brt; 2161 int error; 2162 2163 if (sc->sc_brtcnt >= sc->sc_brtmax) 2164 return ENOSPC; 2165 2166 /* 2167 * Allocate a new bridge forwarding node, and 2168 * initialize the expiration time and Ethernet 2169 * address. 2170 */ 2171 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 2172 if (brt == NULL) 2173 return ENOMEM; 2174 2175 memset(brt, 0, sizeof(*brt)); 2176 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2177 brt->brt_flags = IFBAF_DYNAMIC; 2178 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2179 PSLIST_ENTRY_INIT(brt, brt_list); 2180 PSLIST_ENTRY_INIT(brt, brt_hash); 2181 2182 BRIDGE_RT_LOCK(sc); 2183 error = bridge_rtnode_insert(sc, brt); 2184 BRIDGE_RT_UNLOCK(sc); 2185 2186 if (error != 0) { 2187 pool_put(&bridge_rtnode_pool, brt); 2188 return error; 2189 } 2190 2191 *brtp = brt; 2192 return 0; 2193 } 2194 2195 /* 2196 * bridge_rtupdate: 2197 * 2198 * Add a bridge routing entry. 2199 */ 2200 static int 2201 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 2202 struct ifnet *dst_if, int setflags, uint8_t flags) 2203 { 2204 struct bridge_rtnode *brt; 2205 int s; 2206 2207 again: 2208 /* 2209 * A route for this destination might already exist. If so, 2210 * update it, otherwise create a new one. 2211 */ 2212 BRIDGE_RT_RENTER(s); 2213 brt = bridge_rtnode_lookup(sc, dst); 2214 2215 if (brt != NULL) { 2216 brt->brt_ifp = dst_if; 2217 if (setflags) { 2218 brt->brt_flags = flags; 2219 if (flags & IFBAF_STATIC) 2220 brt->brt_expire = 0; 2221 else 2222 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2223 } else { 2224 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2225 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2226 } 2227 } 2228 BRIDGE_RT_REXIT(s); 2229 2230 if (brt == NULL) { 2231 int r; 2232 2233 r = bridge_rtalloc(sc, dst, &brt); 2234 if (r != 0) 2235 return r; 2236 goto again; 2237 } 2238 2239 return 0; 2240 } 2241 2242 /* 2243 * bridge_rtlookup: 2244 * 2245 * Lookup the destination interface for an address. 2246 */ 2247 static struct ifnet * 2248 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2249 { 2250 struct bridge_rtnode *brt; 2251 struct ifnet *ifs = NULL; 2252 int s; 2253 2254 BRIDGE_RT_RENTER(s); 2255 brt = bridge_rtnode_lookup(sc, addr); 2256 if (brt != NULL) 2257 ifs = brt->brt_ifp; 2258 BRIDGE_RT_REXIT(s); 2259 2260 return ifs; 2261 } 2262 2263 typedef bool (*bridge_iterate_cb_t) 2264 (struct bridge_softc *, struct bridge_rtnode *, bool *, void *); 2265 2266 /* 2267 * bridge_rtlist_iterate_remove: 2268 * 2269 * It iterates on sc->sc_rtlist and removes rtnodes of it which func 2270 * callback judges to remove. Removals of rtnodes are done in a manner 2271 * of pserialize. To this end, all kmem_* operations are placed out of 2272 * mutexes. 2273 */ 2274 static void 2275 bridge_rtlist_iterate_remove(struct bridge_softc *sc, bridge_iterate_cb_t func, void *arg) 2276 { 2277 struct bridge_rtnode *brt; 2278 struct bridge_rtnode **brt_list; 2279 int i, count; 2280 2281 retry: 2282 count = sc->sc_brtcnt; 2283 if (count == 0) 2284 return; 2285 brt_list = kmem_alloc(sizeof(*brt_list) * count, KM_SLEEP); 2286 2287 BRIDGE_RT_LOCK(sc); 2288 if (__predict_false(sc->sc_brtcnt > count)) { 2289 /* The rtnodes increased, we need more memory */ 2290 BRIDGE_RT_UNLOCK(sc); 2291 kmem_free(brt_list, sizeof(*brt_list) * count); 2292 goto retry; 2293 } 2294 2295 i = 0; 2296 /* 2297 * We don't need to use a _SAFE variant here because we know 2298 * that a removed item keeps its next pointer as-is thanks to 2299 * pslist(9) and isn't freed in the loop. 2300 */ 2301 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 2302 bool need_break = false; 2303 if (func(sc, brt, &need_break, arg)) { 2304 bridge_rtnode_remove(sc, brt); 2305 brt_list[i++] = brt; 2306 } 2307 if (need_break) 2308 break; 2309 } 2310 2311 if (i > 0) 2312 BRIDGE_RT_PSZ_PERFORM(sc); 2313 BRIDGE_RT_UNLOCK(sc); 2314 2315 while (--i >= 0) 2316 bridge_rtnode_destroy(brt_list[i]); 2317 2318 kmem_free(brt_list, sizeof(*brt_list) * count); 2319 } 2320 2321 static bool 2322 bridge_rttrim0_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2323 bool *need_break, void *arg) 2324 { 2325 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2326 /* Take into account of the subsequent removal */ 2327 if ((sc->sc_brtcnt - 1) <= sc->sc_brtmax) 2328 *need_break = true; 2329 return true; 2330 } else 2331 return false; 2332 } 2333 2334 static void 2335 bridge_rttrim0(struct bridge_softc *sc) 2336 { 2337 bridge_rtlist_iterate_remove(sc, bridge_rttrim0_cb, NULL); 2338 } 2339 2340 /* 2341 * bridge_rttrim: 2342 * 2343 * Trim the routine table so that we have a number 2344 * of routing entries less than or equal to the 2345 * maximum number. 2346 */ 2347 static void 2348 bridge_rttrim(struct bridge_softc *sc) 2349 { 2350 2351 /* Make sure we actually need to do this. */ 2352 if (sc->sc_brtcnt <= sc->sc_brtmax) 2353 return; 2354 2355 /* Force an aging cycle; this might trim enough addresses. */ 2356 bridge_rtage(sc); 2357 if (sc->sc_brtcnt <= sc->sc_brtmax) 2358 return; 2359 2360 bridge_rttrim0(sc); 2361 2362 return; 2363 } 2364 2365 /* 2366 * bridge_timer: 2367 * 2368 * Aging timer for the bridge. 2369 */ 2370 static void 2371 bridge_timer(void *arg) 2372 { 2373 struct bridge_softc *sc = arg; 2374 2375 workqueue_enqueue(sc->sc_rtage_wq, &sc->sc_rtage_wk, NULL); 2376 } 2377 2378 static void 2379 bridge_rtage_work(struct work *wk, void *arg) 2380 { 2381 struct bridge_softc *sc = arg; 2382 2383 KASSERT(wk == &sc->sc_rtage_wk); 2384 2385 bridge_rtage(sc); 2386 2387 if (sc->sc_if.if_flags & IFF_RUNNING) 2388 callout_reset(&sc->sc_brcallout, 2389 bridge_rtable_prune_period * hz, bridge_timer, sc); 2390 } 2391 2392 static bool 2393 bridge_rtage_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2394 bool *need_break, void *arg) 2395 { 2396 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2397 time_uptime >= brt->brt_expire) 2398 return true; 2399 else 2400 return false; 2401 } 2402 2403 /* 2404 * bridge_rtage: 2405 * 2406 * Perform an aging cycle. 2407 */ 2408 static void 2409 bridge_rtage(struct bridge_softc *sc) 2410 { 2411 bridge_rtlist_iterate_remove(sc, bridge_rtage_cb, NULL); 2412 } 2413 2414 2415 static bool 2416 bridge_rtflush_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2417 bool *need_break, void *arg) 2418 { 2419 int full = *(int*)arg; 2420 2421 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2422 return true; 2423 else 2424 return false; 2425 } 2426 2427 /* 2428 * bridge_rtflush: 2429 * 2430 * Remove all dynamic addresses from the bridge. 2431 */ 2432 static void 2433 bridge_rtflush(struct bridge_softc *sc, int full) 2434 { 2435 bridge_rtlist_iterate_remove(sc, bridge_rtflush_cb, &full); 2436 } 2437 2438 /* 2439 * bridge_rtdaddr: 2440 * 2441 * Remove an address from the table. 2442 */ 2443 static int 2444 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2445 { 2446 struct bridge_rtnode *brt; 2447 2448 BRIDGE_RT_LOCK(sc); 2449 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2450 BRIDGE_RT_UNLOCK(sc); 2451 return ENOENT; 2452 } 2453 bridge_rtnode_remove(sc, brt); 2454 BRIDGE_RT_PSZ_PERFORM(sc); 2455 BRIDGE_RT_UNLOCK(sc); 2456 2457 bridge_rtnode_destroy(brt); 2458 2459 return 0; 2460 } 2461 2462 /* 2463 * bridge_rtdelete: 2464 * 2465 * Delete routes to a speicifc member interface. 2466 */ 2467 static void 2468 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2469 { 2470 struct bridge_rtnode *brt; 2471 2472 /* XXX pserialize_perform for each entry is slow */ 2473 again: 2474 BRIDGE_RT_LOCK(sc); 2475 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 2476 if (brt->brt_ifp == ifp) 2477 break; 2478 } 2479 if (brt == NULL) { 2480 BRIDGE_RT_UNLOCK(sc); 2481 return; 2482 } 2483 bridge_rtnode_remove(sc, brt); 2484 BRIDGE_RT_PSZ_PERFORM(sc); 2485 BRIDGE_RT_UNLOCK(sc); 2486 2487 bridge_rtnode_destroy(brt); 2488 2489 goto again; 2490 } 2491 2492 /* 2493 * bridge_rtable_init: 2494 * 2495 * Initialize the route table for this bridge. 2496 */ 2497 static void 2498 bridge_rtable_init(struct bridge_softc *sc) 2499 { 2500 int i; 2501 2502 sc->sc_rthash = kmem_alloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2503 KM_SLEEP); 2504 2505 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2506 PSLIST_INIT(&sc->sc_rthash[i]); 2507 2508 sc->sc_rthash_key = cprng_fast32(); 2509 2510 PSLIST_INIT(&sc->sc_rtlist); 2511 2512 sc->sc_rtlist_psz = pserialize_create(); 2513 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 2514 } 2515 2516 /* 2517 * bridge_rtable_fini: 2518 * 2519 * Deconstruct the route table for this bridge. 2520 */ 2521 static void 2522 bridge_rtable_fini(struct bridge_softc *sc) 2523 { 2524 2525 kmem_free(sc->sc_rthash, sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE); 2526 mutex_obj_free(sc->sc_rtlist_lock); 2527 pserialize_destroy(sc->sc_rtlist_psz); 2528 } 2529 2530 /* 2531 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2532 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2533 */ 2534 #define mix(a, b, c) \ 2535 do { \ 2536 a -= b; a -= c; a ^= (c >> 13); \ 2537 b -= c; b -= a; b ^= (a << 8); \ 2538 c -= a; c -= b; c ^= (b >> 13); \ 2539 a -= b; a -= c; a ^= (c >> 12); \ 2540 b -= c; b -= a; b ^= (a << 16); \ 2541 c -= a; c -= b; c ^= (b >> 5); \ 2542 a -= b; a -= c; a ^= (c >> 3); \ 2543 b -= c; b -= a; b ^= (a << 10); \ 2544 c -= a; c -= b; c ^= (b >> 15); \ 2545 } while (/*CONSTCOND*/0) 2546 2547 static inline uint32_t 2548 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2549 { 2550 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2551 2552 b += addr[5] << 8; 2553 b += addr[4]; 2554 a += (uint32_t)addr[3] << 24; 2555 a += addr[2] << 16; 2556 a += addr[1] << 8; 2557 a += addr[0]; 2558 2559 mix(a, b, c); 2560 2561 return (c & BRIDGE_RTHASH_MASK); 2562 } 2563 2564 #undef mix 2565 2566 /* 2567 * bridge_rtnode_lookup: 2568 * 2569 * Look up a bridge route node for the specified destination. 2570 */ 2571 static struct bridge_rtnode * 2572 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2573 { 2574 struct bridge_rtnode *brt; 2575 uint32_t hash; 2576 int dir; 2577 2578 hash = bridge_rthash(sc, addr); 2579 BRIDGE_RTHASH_READER_FOREACH(brt, sc, hash) { 2580 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2581 if (dir == 0) 2582 return brt; 2583 if (dir > 0) 2584 return NULL; 2585 } 2586 2587 return NULL; 2588 } 2589 2590 /* 2591 * bridge_rtnode_insert: 2592 * 2593 * Insert the specified bridge node into the route table. We 2594 * assume the entry is not already in the table. 2595 */ 2596 static int 2597 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2598 { 2599 struct bridge_rtnode *lbrt, *prev = NULL; 2600 uint32_t hash; 2601 2602 KASSERT(BRIDGE_RT_LOCKED(sc)); 2603 2604 hash = bridge_rthash(sc, brt->brt_addr); 2605 BRIDGE_RTHASH_WRITER_FOREACH(lbrt, sc, hash) { 2606 int dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2607 if (dir == 0) 2608 return EEXIST; 2609 if (dir > 0) 2610 break; 2611 prev = lbrt; 2612 } 2613 if (prev == NULL) 2614 BRIDGE_RTHASH_WRITER_INSERT_HEAD(sc, hash, brt); 2615 else 2616 BRIDGE_RTHASH_WRITER_INSERT_AFTER(prev, brt); 2617 2618 BRIDGE_RTLIST_WRITER_INSERT_HEAD(sc, brt); 2619 sc->sc_brtcnt++; 2620 2621 return 0; 2622 } 2623 2624 /* 2625 * bridge_rtnode_remove: 2626 * 2627 * Remove a bridge rtnode from the rthash and the rtlist of a bridge. 2628 */ 2629 static void 2630 bridge_rtnode_remove(struct bridge_softc *sc, struct bridge_rtnode *brt) 2631 { 2632 2633 KASSERT(BRIDGE_RT_LOCKED(sc)); 2634 2635 BRIDGE_RTHASH_WRITER_REMOVE(brt); 2636 BRIDGE_RTLIST_WRITER_REMOVE(brt); 2637 sc->sc_brtcnt--; 2638 } 2639 2640 /* 2641 * bridge_rtnode_destroy: 2642 * 2643 * Destroy a bridge rtnode. 2644 */ 2645 static void 2646 bridge_rtnode_destroy(struct bridge_rtnode *brt) 2647 { 2648 2649 PSLIST_ENTRY_DESTROY(brt, brt_list); 2650 PSLIST_ENTRY_DESTROY(brt, brt_hash); 2651 pool_put(&bridge_rtnode_pool, brt); 2652 } 2653 2654 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2655 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2656 2657 /* 2658 * Send bridge packets through IPF if they are one of the types IPF can deal 2659 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2660 * question.) 2661 */ 2662 static int 2663 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2664 { 2665 int snap, error; 2666 struct ether_header *eh1, eh2; 2667 struct llc llc1; 2668 uint16_t ether_type; 2669 2670 snap = 0; 2671 error = -1; /* Default error if not error == 0 */ 2672 eh1 = mtod(*mp, struct ether_header *); 2673 ether_type = ntohs(eh1->ether_type); 2674 2675 /* 2676 * Check for SNAP/LLC. 2677 */ 2678 if (ether_type < ETHERMTU) { 2679 struct llc *llc2 = (struct llc *)(eh1 + 1); 2680 2681 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2682 llc2->llc_dsap == LLC_SNAP_LSAP && 2683 llc2->llc_ssap == LLC_SNAP_LSAP && 2684 llc2->llc_control == LLC_UI) { 2685 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2686 snap = 1; 2687 } 2688 } 2689 2690 /* 2691 * If we're trying to filter bridge traffic, don't look at anything 2692 * other than IP and ARP traffic. If the filter doesn't understand 2693 * IPv6, don't allow IPv6 through the bridge either. This is lame 2694 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2695 * but of course we don't have an AppleTalk filter to begin with. 2696 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2697 * ARP traffic.) 2698 */ 2699 switch (ether_type) { 2700 case ETHERTYPE_ARP: 2701 case ETHERTYPE_REVARP: 2702 return 0; /* Automatically pass */ 2703 case ETHERTYPE_IP: 2704 # ifdef INET6 2705 case ETHERTYPE_IPV6: 2706 # endif /* INET6 */ 2707 break; 2708 default: 2709 goto bad; 2710 } 2711 2712 /* Strip off the Ethernet header and keep a copy. */ 2713 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2714 m_adj(*mp, ETHER_HDR_LEN); 2715 2716 /* Strip off snap header, if present */ 2717 if (snap) { 2718 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2719 m_adj(*mp, sizeof(struct llc)); 2720 } 2721 2722 /* 2723 * Check basic packet sanity and run IPF through pfil. 2724 */ 2725 KASSERT(!cpu_intr_p()); 2726 switch (ether_type) 2727 { 2728 case ETHERTYPE_IP : 2729 error = bridge_ip_checkbasic(mp); 2730 if (error == 0) 2731 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2732 break; 2733 # ifdef INET6 2734 case ETHERTYPE_IPV6 : 2735 error = bridge_ip6_checkbasic(mp); 2736 if (error == 0) 2737 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2738 break; 2739 # endif 2740 default : 2741 error = 0; 2742 break; 2743 } 2744 2745 if (*mp == NULL) 2746 return error; 2747 if (error != 0) 2748 goto bad; 2749 2750 error = -1; 2751 2752 /* 2753 * Finally, put everything back the way it was and return 2754 */ 2755 if (snap) { 2756 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2757 if (*mp == NULL) 2758 return error; 2759 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2760 } 2761 2762 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2763 if (*mp == NULL) 2764 return error; 2765 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2766 2767 return 0; 2768 2769 bad: 2770 m_freem(*mp); 2771 *mp = NULL; 2772 return error; 2773 } 2774 2775 /* 2776 * Perform basic checks on header size since 2777 * IPF assumes ip_input has already processed 2778 * it for it. Cut-and-pasted from ip_input.c. 2779 * Given how simple the IPv6 version is, 2780 * does the IPv4 version really need to be 2781 * this complicated? 2782 * 2783 * XXX Should we update ipstat here, or not? 2784 * XXX Right now we update ipstat but not 2785 * XXX csum_counter. 2786 */ 2787 static int 2788 bridge_ip_checkbasic(struct mbuf **mp) 2789 { 2790 struct mbuf *m = *mp; 2791 struct ip *ip; 2792 int len, hlen; 2793 2794 if (*mp == NULL) 2795 return -1; 2796 2797 if (M_GET_ALIGNED_HDR(&m, struct ip, true) != 0) { 2798 /* XXXJRT new stat, please */ 2799 ip_statinc(IP_STAT_TOOSMALL); 2800 goto bad; 2801 } 2802 ip = mtod(m, struct ip *); 2803 if (ip == NULL) goto bad; 2804 2805 if (ip->ip_v != IPVERSION) { 2806 ip_statinc(IP_STAT_BADVERS); 2807 goto bad; 2808 } 2809 hlen = ip->ip_hl << 2; 2810 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2811 ip_statinc(IP_STAT_BADHLEN); 2812 goto bad; 2813 } 2814 if (hlen > m->m_len) { 2815 if ((m = m_pullup(m, hlen)) == 0) { 2816 ip_statinc(IP_STAT_BADHLEN); 2817 goto bad; 2818 } 2819 ip = mtod(m, struct ip *); 2820 if (ip == NULL) goto bad; 2821 } 2822 2823 switch (m->m_pkthdr.csum_flags & 2824 ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_IPv4) | 2825 M_CSUM_IPv4_BAD)) { 2826 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2827 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2828 goto bad; 2829 2830 case M_CSUM_IPv4: 2831 /* Checksum was okay. */ 2832 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2833 break; 2834 2835 default: 2836 /* Must compute it ourselves. */ 2837 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2838 if (in_cksum(m, hlen) != 0) 2839 goto bad; 2840 break; 2841 } 2842 2843 /* Retrieve the packet length. */ 2844 len = ntohs(ip->ip_len); 2845 2846 /* 2847 * Check for additional length bogosity 2848 */ 2849 if (len < hlen) { 2850 ip_statinc(IP_STAT_BADLEN); 2851 goto bad; 2852 } 2853 2854 /* 2855 * Check that the amount of data in the buffers 2856 * is as at least much as the IP header would have us expect. 2857 * Drop packet if shorter than we expect. 2858 */ 2859 if (m->m_pkthdr.len < len) { 2860 ip_statinc(IP_STAT_TOOSHORT); 2861 goto bad; 2862 } 2863 2864 /* Checks out, proceed */ 2865 *mp = m; 2866 return 0; 2867 2868 bad: 2869 *mp = m; 2870 return -1; 2871 } 2872 2873 # ifdef INET6 2874 /* 2875 * Same as above, but for IPv6. 2876 * Cut-and-pasted from ip6_input.c. 2877 * XXX Should we update ip6stat, or not? 2878 */ 2879 static int 2880 bridge_ip6_checkbasic(struct mbuf **mp) 2881 { 2882 struct mbuf *m = *mp; 2883 struct ip6_hdr *ip6; 2884 2885 /* 2886 * If the IPv6 header is not aligned, slurp it up into a new 2887 * mbuf with space for link headers, in the event we forward 2888 * it. Otherwise, if it is aligned, make sure the entire base 2889 * IPv6 header is in the first mbuf of the chain. 2890 */ 2891 if (M_GET_ALIGNED_HDR(&m, struct ip6_hdr, true) != 0) { 2892 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2893 /* XXXJRT new stat, please */ 2894 ip6_statinc(IP6_STAT_TOOSMALL); 2895 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2896 goto bad; 2897 } 2898 2899 ip6 = mtod(m, struct ip6_hdr *); 2900 2901 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2902 ip6_statinc(IP6_STAT_BADVERS); 2903 in6_ifstat_inc(m_get_rcvif_NOMPSAFE(m), ifs6_in_hdrerr); 2904 goto bad; 2905 } 2906 2907 /* Checks out, proceed */ 2908 *mp = m; 2909 return 0; 2910 2911 bad: 2912 *mp = m; 2913 return -1; 2914 } 2915 # endif /* INET6 */ 2916
Indexes created Thu Oct 02 14:10:14 GMT 2025