if_bridge.c revision 1.148.2.2
1 /* $NetBSD: if_bridge.c,v 1.148.2.2 2018/04/22 07:20:27 pgoyette 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 1.148.2.2 2018/04/22 07:20:27 pgoyette 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> 115 116 #if defined(BRIDGE_IPF) 117 /* Used for bridge_ip[6]_checkbasic */ 118 #include <netinet/in.h> 119 #include <netinet/in_systm.h> 120 #include <netinet/ip.h> 121 #include <netinet/ip_var.h> 122 #include <netinet/ip_private.h> /* XXX */ 123 124 #include <netinet/ip6.h> 125 #include <netinet6/in6_var.h> 126 #include <netinet6/ip6_var.h> 127 #include <netinet6/ip6_private.h> /* XXX */ 128 #endif /* BRIDGE_IPF */ 129 130 /* 131 * Size of the route hash table. Must be a power of two. 132 */ 133 #ifndef BRIDGE_RTHASH_SIZE 134 #define BRIDGE_RTHASH_SIZE 1024 135 #endif 136 137 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 138 139 #include "carp.h" 140 #if NCARP > 0 141 #include <netinet/in.h> 142 #include <netinet/in_var.h> 143 #include <netinet/ip_carp.h> 144 #endif 145 146 #include "ioconf.h" 147 148 __CTASSERT(sizeof(struct ifbifconf) == sizeof(struct ifbaconf)); 149 __CTASSERT(offsetof(struct ifbifconf, ifbic_len) == offsetof(struct ifbaconf, ifbac_len)); 150 __CTASSERT(offsetof(struct ifbifconf, ifbic_buf) == offsetof(struct ifbaconf, ifbac_buf)); 151 152 /* 153 * Maximum number of addresses to cache. 154 */ 155 #ifndef BRIDGE_RTABLE_MAX 156 #define BRIDGE_RTABLE_MAX 100 157 #endif 158 159 /* 160 * Spanning tree defaults. 161 */ 162 #define BSTP_DEFAULT_MAX_AGE (20 * 256) 163 #define BSTP_DEFAULT_HELLO_TIME (2 * 256) 164 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) 165 #define BSTP_DEFAULT_HOLD_TIME (1 * 256) 166 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 167 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 168 #define BSTP_DEFAULT_PATH_COST 55 169 170 /* 171 * Timeout (in seconds) for entries learned dynamically. 172 */ 173 #ifndef BRIDGE_RTABLE_TIMEOUT 174 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 175 #endif 176 177 /* 178 * Number of seconds between walks of the route list. 179 */ 180 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 181 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 182 #endif 183 184 #define BRIDGE_RT_LOCK(_sc) mutex_enter((_sc)->sc_rtlist_lock) 185 #define BRIDGE_RT_UNLOCK(_sc) mutex_exit((_sc)->sc_rtlist_lock) 186 #define BRIDGE_RT_LOCKED(_sc) mutex_owned((_sc)->sc_rtlist_lock) 187 188 #define BRIDGE_RT_PSZ_PERFORM(_sc) \ 189 pserialize_perform((_sc)->sc_rtlist_psz) 190 191 #define BRIDGE_RT_RENTER(__s) do { __s = pserialize_read_enter(); } while (0) 192 #define BRIDGE_RT_REXIT(__s) do { pserialize_read_exit(__s); } while (0) 193 194 #define BRIDGE_RTLIST_READER_FOREACH(_brt, _sc) \ 195 PSLIST_READER_FOREACH((_brt), &((_sc)->sc_rtlist), \ 196 struct bridge_rtnode, brt_list) 197 #define BRIDGE_RTLIST_WRITER_FOREACH(_brt, _sc) \ 198 PSLIST_WRITER_FOREACH((_brt), &((_sc)->sc_rtlist), \ 199 struct bridge_rtnode, brt_list) 200 #define BRIDGE_RTLIST_WRITER_INSERT_HEAD(_sc, _brt) \ 201 PSLIST_WRITER_INSERT_HEAD(&(_sc)->sc_rtlist, brt, brt_list) 202 #define BRIDGE_RTLIST_WRITER_REMOVE(_brt) \ 203 PSLIST_WRITER_REMOVE((_brt), brt_list) 204 205 #define BRIDGE_RTHASH_READER_FOREACH(_brt, _sc, _hash) \ 206 PSLIST_READER_FOREACH((_brt), &(_sc)->sc_rthash[(_hash)], \ 207 struct bridge_rtnode, brt_hash) 208 #define BRIDGE_RTHASH_WRITER_FOREACH(_brt, _sc, _hash) \ 209 PSLIST_WRITER_FOREACH((_brt), &(_sc)->sc_rthash[(_hash)], \ 210 struct bridge_rtnode, brt_hash) 211 #define BRIDGE_RTHASH_WRITER_INSERT_HEAD(_sc, _hash, _brt) \ 212 PSLIST_WRITER_INSERT_HEAD(&(_sc)->sc_rthash[(_hash)], brt, brt_hash) 213 #define BRIDGE_RTHASH_WRITER_INSERT_AFTER(_brt, _new) \ 214 PSLIST_WRITER_INSERT_AFTER((_brt), (_new), brt_hash) 215 #define BRIDGE_RTHASH_WRITER_REMOVE(_brt) \ 216 PSLIST_WRITER_REMOVE((_brt), brt_hash) 217 218 #ifdef NET_MPSAFE 219 #define DECLARE_LOCK_VARIABLE 220 #define ACQUIRE_GLOBAL_LOCKS() do { } while (0) 221 #define RELEASE_GLOBAL_LOCKS() do { } while (0) 222 #else 223 #define DECLARE_LOCK_VARIABLE int __s 224 #define ACQUIRE_GLOBAL_LOCKS() do { \ 225 KERNEL_LOCK(1, NULL); \ 226 mutex_enter(softnet_lock); \ 227 __s = splsoftnet(); \ 228 } while (0) 229 #define RELEASE_GLOBAL_LOCKS() do { \ 230 splx(__s); \ 231 mutex_exit(softnet_lock); \ 232 KERNEL_UNLOCK_ONE(NULL); \ 233 } while (0) 234 #endif 235 236 struct psref_class *bridge_psref_class __read_mostly; 237 238 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 239 240 static struct pool bridge_rtnode_pool; 241 242 static int bridge_clone_create(struct if_clone *, int); 243 static int bridge_clone_destroy(struct ifnet *); 244 245 static int bridge_ioctl(struct ifnet *, u_long, void *); 246 static int bridge_init(struct ifnet *); 247 static void bridge_stop(struct ifnet *, int); 248 static void bridge_start(struct ifnet *); 249 250 static void bridge_input(struct ifnet *, struct mbuf *); 251 static void bridge_forward(struct bridge_softc *, struct mbuf *); 252 253 static void bridge_timer(void *); 254 255 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 256 struct mbuf *); 257 258 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 259 struct ifnet *, int, uint8_t); 260 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 261 static void bridge_rttrim(struct bridge_softc *); 262 static void bridge_rtage(struct bridge_softc *); 263 static void bridge_rtage_work(struct work *, void *); 264 static void bridge_rtflush(struct bridge_softc *, int); 265 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 266 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp); 267 268 static void bridge_rtable_init(struct bridge_softc *); 269 static void bridge_rtable_fini(struct bridge_softc *); 270 271 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 272 const uint8_t *); 273 static int bridge_rtnode_insert(struct bridge_softc *, 274 struct bridge_rtnode *); 275 static void bridge_rtnode_remove(struct bridge_softc *, 276 struct bridge_rtnode *); 277 static void bridge_rtnode_destroy(struct bridge_rtnode *); 278 279 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 280 const char *name, 281 struct psref *); 282 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 283 struct ifnet *ifp, 284 struct psref *); 285 static void bridge_release_member(struct bridge_softc *, struct bridge_iflist *, 286 struct psref *); 287 static void bridge_delete_member(struct bridge_softc *, 288 struct bridge_iflist *); 289 static void bridge_acquire_member(struct bridge_softc *sc, 290 struct bridge_iflist *, 291 struct psref *); 292 293 static int bridge_ioctl_add(struct bridge_softc *, void *); 294 static int bridge_ioctl_del(struct bridge_softc *, void *); 295 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 296 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 297 static int bridge_ioctl_scache(struct bridge_softc *, void *); 298 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 299 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 300 static int bridge_ioctl_rts(struct bridge_softc *, void *); 301 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 302 static int bridge_ioctl_sto(struct bridge_softc *, void *); 303 static int bridge_ioctl_gto(struct bridge_softc *, void *); 304 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 305 static int bridge_ioctl_flush(struct bridge_softc *, void *); 306 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 307 static int bridge_ioctl_spri(struct bridge_softc *, void *); 308 static int bridge_ioctl_ght(struct bridge_softc *, void *); 309 static int bridge_ioctl_sht(struct bridge_softc *, void *); 310 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 311 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 312 static int bridge_ioctl_gma(struct bridge_softc *, void *); 313 static int bridge_ioctl_sma(struct bridge_softc *, void *); 314 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 315 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 316 #if defined(BRIDGE_IPF) 317 static int bridge_ioctl_gfilt(struct bridge_softc *, void *); 318 static int bridge_ioctl_sfilt(struct bridge_softc *, void *); 319 static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int); 320 static int bridge_ip_checkbasic(struct mbuf **mp); 321 # ifdef INET6 322 static int bridge_ip6_checkbasic(struct mbuf **mp); 323 # endif /* INET6 */ 324 #endif /* BRIDGE_IPF */ 325 326 struct bridge_control { 327 int (*bc_func)(struct bridge_softc *, void *); 328 int bc_argsize; 329 int bc_flags; 330 }; 331 332 #define BC_F_COPYIN 0x01 /* copy arguments in */ 333 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 334 #define BC_F_SUSER 0x04 /* do super-user check */ 335 #define BC_F_XLATEIN 0x08 /* xlate arguments in */ 336 #define BC_F_XLATEOUT 0x10 /* xlate arguments out */ 337 338 static const struct bridge_control bridge_control_table[] = { 339 [BRDGADD] = {bridge_ioctl_add, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 340 [BRDGDEL] = {bridge_ioctl_del, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 341 342 [BRDGGIFFLGS] = {bridge_ioctl_gifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_COPYOUT}, 343 [BRDGSIFFLGS] = {bridge_ioctl_sifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 344 345 [BRDGSCACHE] = {bridge_ioctl_scache, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 346 [BRDGGCACHE] = {bridge_ioctl_gcache, sizeof(struct ifbrparam), BC_F_COPYOUT}, 347 348 [OBRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_COPYIN|BC_F_COPYOUT}, 349 [OBRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_COPYIN|BC_F_COPYOUT}, 350 351 [BRDGSADDR] = {bridge_ioctl_saddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 352 353 [BRDGSTO] = {bridge_ioctl_sto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 354 [BRDGGTO] = {bridge_ioctl_gto, sizeof(struct ifbrparam), BC_F_COPYOUT}, 355 356 [BRDGDADDR] = {bridge_ioctl_daddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 357 358 [BRDGFLUSH] = {bridge_ioctl_flush, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 359 360 [BRDGGPRI] = {bridge_ioctl_gpri, sizeof(struct ifbrparam), BC_F_COPYOUT}, 361 [BRDGSPRI] = {bridge_ioctl_spri, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 362 363 [BRDGGHT] = {bridge_ioctl_ght, sizeof(struct ifbrparam), BC_F_COPYOUT}, 364 [BRDGSHT] = {bridge_ioctl_sht, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 365 366 [BRDGGFD] = {bridge_ioctl_gfd, sizeof(struct ifbrparam), BC_F_COPYOUT}, 367 [BRDGSFD] = {bridge_ioctl_sfd, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 368 369 [BRDGGMA] = {bridge_ioctl_gma, sizeof(struct ifbrparam), BC_F_COPYOUT}, 370 [BRDGSMA] = {bridge_ioctl_sma, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 371 372 [BRDGSIFPRIO] = {bridge_ioctl_sifprio, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 373 374 [BRDGSIFCOST] = {bridge_ioctl_sifcost, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 375 #if defined(BRIDGE_IPF) 376 [BRDGGFILT] = {bridge_ioctl_gfilt, sizeof(struct ifbrparam), BC_F_COPYOUT}, 377 [BRDGSFILT] = {bridge_ioctl_sfilt, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 378 #endif /* BRIDGE_IPF */ 379 [BRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 380 [BRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 381 }; 382 383 static const int bridge_control_table_size = __arraycount(bridge_control_table); 384 385 static struct if_clone bridge_cloner = 386 IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy); 387 388 /* 389 * bridgeattach: 390 * 391 * Pseudo-device attach routine. 392 */ 393 void 394 bridgeattach(int n) 395 { 396 397 pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode), 398 0, 0, 0, "brtpl", NULL, IPL_NET); 399 400 bridge_psref_class = psref_class_create("bridge", IPL_SOFTNET); 401 402 if_clone_attach(&bridge_cloner); 403 } 404 405 /* 406 * bridge_clone_create: 407 * 408 * Create a new bridge instance. 409 */ 410 static int 411 bridge_clone_create(struct if_clone *ifc, int unit) 412 { 413 struct bridge_softc *sc; 414 struct ifnet *ifp; 415 int error; 416 417 sc = kmem_zalloc(sizeof(*sc), KM_SLEEP); 418 ifp = &sc->sc_if; 419 420 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 421 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 422 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 423 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 424 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 425 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 426 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 427 sc->sc_filter_flags = 0; 428 429 /* Initialize our routing table. */ 430 bridge_rtable_init(sc); 431 432 error = workqueue_create(&sc->sc_rtage_wq, "bridge_rtage", 433 bridge_rtage_work, sc, PRI_SOFTNET, IPL_SOFTNET, WQ_MPSAFE); 434 if (error) 435 panic("%s: workqueue_create %d\n", __func__, error); 436 437 callout_init(&sc->sc_brcallout, CALLOUT_MPSAFE); 438 callout_init(&sc->sc_bstpcallout, CALLOUT_MPSAFE); 439 440 mutex_init(&sc->sc_iflist_psref.bip_lock, MUTEX_DEFAULT, IPL_NONE); 441 PSLIST_INIT(&sc->sc_iflist_psref.bip_iflist); 442 sc->sc_iflist_psref.bip_psz = pserialize_create(); 443 444 if_initname(ifp, ifc->ifc_name, unit); 445 ifp->if_softc = sc; 446 ifp->if_extflags = IFEF_NO_LINK_STATE_CHANGE; 447 #ifdef NET_MPSAFE 448 ifp->if_extflags |= IFEF_MPSAFE; 449 #endif 450 ifp->if_mtu = ETHERMTU; 451 ifp->if_ioctl = bridge_ioctl; 452 ifp->if_output = bridge_output; 453 ifp->if_start = bridge_start; 454 ifp->if_stop = bridge_stop; 455 ifp->if_init = bridge_init; 456 ifp->if_type = IFT_BRIDGE; 457 ifp->if_addrlen = 0; 458 ifp->if_dlt = DLT_EN10MB; 459 ifp->if_hdrlen = ETHER_HDR_LEN; 460 461 error = if_initialize(ifp); 462 if (error != 0) { 463 pserialize_destroy(sc->sc_iflist_psref.bip_psz); 464 mutex_destroy(&sc->sc_iflist_psref.bip_lock); 465 callout_destroy(&sc->sc_brcallout); 466 callout_destroy(&sc->sc_bstpcallout); 467 workqueue_destroy(sc->sc_rtage_wq); 468 bridge_rtable_fini(sc); 469 kmem_free(sc, sizeof(*sc)); 470 471 return error; 472 } 473 if_register(ifp); 474 475 if_alloc_sadl(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 psref_target_destroy(&bif->bif_psref, bridge_psref_class); 747 748 PSLIST_ENTRY_DESTROY(bif, bif_next); 749 kmem_free(bif, sizeof(*bif)); 750 751 BRIDGE_LOCK(sc); 752 } 753 754 static int 755 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 756 { 757 struct ifbreq *req = arg; 758 struct bridge_iflist *bif = NULL; 759 struct ifnet *ifs; 760 int error = 0; 761 struct psref psref; 762 763 ifs = if_get(req->ifbr_ifsname, &psref); 764 if (ifs == NULL) 765 return ENOENT; 766 767 if (ifs->if_bridge == sc) { 768 error = EEXIST; 769 goto out; 770 } 771 772 if (ifs->if_bridge != NULL) { 773 error = EBUSY; 774 goto out; 775 } 776 777 if (ifs->_if_input != ether_input) { 778 error = EINVAL; 779 goto out; 780 } 781 782 /* FIXME: doesn't work with non-IFF_SIMPLEX interfaces */ 783 if ((ifs->if_flags & IFF_SIMPLEX) == 0) { 784 error = EINVAL; 785 goto out; 786 } 787 788 bif = kmem_alloc(sizeof(*bif), KM_SLEEP); 789 790 switch (ifs->if_type) { 791 case IFT_ETHER: 792 if (sc->sc_if.if_mtu != ifs->if_mtu) { 793 error = EINVAL; 794 goto out; 795 } 796 /* FALLTHROUGH */ 797 case IFT_L2TP: 798 IFNET_LOCK(ifs); 799 error = ether_enable_vlan_mtu(ifs); 800 IFNET_UNLOCK(ifs); 801 if (error > 0) 802 goto out; 803 /* 804 * Place the interface into promiscuous mode. 805 */ 806 error = ifpromisc(ifs, 1); 807 if (error) 808 goto out; 809 break; 810 default: 811 error = EINVAL; 812 goto out; 813 } 814 815 bif->bif_ifp = ifs; 816 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 817 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 818 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 819 PSLIST_ENTRY_INIT(bif, bif_next); 820 psref_target_init(&bif->bif_psref, bridge_psref_class); 821 822 BRIDGE_LOCK(sc); 823 824 ifs->if_bridge = sc; 825 ifs->if_bridgeif = bif; 826 PSLIST_WRITER_INSERT_HEAD(&sc->sc_iflist_psref.bip_iflist, bif, bif_next); 827 ifs->_if_input = bridge_input; 828 829 BRIDGE_UNLOCK(sc); 830 831 if (sc->sc_if.if_flags & IFF_RUNNING) 832 bstp_initialization(sc); 833 else 834 bstp_stop(sc); 835 836 out: 837 if_put(ifs, &psref); 838 if (error) { 839 if (bif != NULL) 840 kmem_free(bif, sizeof(*bif)); 841 } 842 return error; 843 } 844 845 static int 846 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 847 { 848 struct ifbreq *req = arg; 849 const char *name = req->ifbr_ifsname; 850 struct bridge_iflist *bif; 851 struct ifnet *ifs; 852 853 BRIDGE_LOCK(sc); 854 855 /* 856 * Don't use bridge_lookup_member. We want to get a member 857 * with bif_refs == 0. 858 */ 859 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 860 ifs = bif->bif_ifp; 861 if (strcmp(ifs->if_xname, name) == 0) 862 break; 863 } 864 865 if (bif == NULL) { 866 BRIDGE_UNLOCK(sc); 867 return ENOENT; 868 } 869 870 bridge_delete_member(sc, bif); 871 872 BRIDGE_UNLOCK(sc); 873 874 switch (ifs->if_type) { 875 case IFT_ETHER: 876 case IFT_L2TP: 877 /* 878 * Take the interface out of promiscuous mode. 879 * Don't call it with holding a spin lock. 880 */ 881 (void) ifpromisc(ifs, 0); 882 IFNET_LOCK(ifs); 883 (void) ether_disable_vlan_mtu(ifs); 884 IFNET_UNLOCK(ifs); 885 break; 886 default: 887 #ifdef DIAGNOSTIC 888 panic("bridge_delete_member: impossible"); 889 #endif 890 break; 891 } 892 893 bridge_rtdelete(sc, ifs); 894 895 if (sc->sc_if.if_flags & IFF_RUNNING) 896 bstp_initialization(sc); 897 898 return 0; 899 } 900 901 static int 902 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 903 { 904 struct ifbreq *req = arg; 905 struct bridge_iflist *bif; 906 struct psref psref; 907 908 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 909 if (bif == NULL) 910 return ENOENT; 911 912 req->ifbr_ifsflags = bif->bif_flags; 913 req->ifbr_state = bif->bif_state; 914 req->ifbr_priority = bif->bif_priority; 915 req->ifbr_path_cost = bif->bif_path_cost; 916 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 917 918 bridge_release_member(sc, bif, &psref); 919 920 return 0; 921 } 922 923 static int 924 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 925 { 926 struct ifbreq *req = arg; 927 struct bridge_iflist *bif; 928 struct psref psref; 929 930 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 931 if (bif == NULL) 932 return ENOENT; 933 934 if (req->ifbr_ifsflags & IFBIF_STP) { 935 switch (bif->bif_ifp->if_type) { 936 case IFT_ETHER: 937 case IFT_L2TP: 938 /* These can do spanning tree. */ 939 break; 940 941 default: 942 /* Nothing else can. */ 943 bridge_release_member(sc, bif, &psref); 944 return EINVAL; 945 } 946 } 947 948 bif->bif_flags = req->ifbr_ifsflags; 949 950 bridge_release_member(sc, bif, &psref); 951 952 if (sc->sc_if.if_flags & IFF_RUNNING) 953 bstp_initialization(sc); 954 955 return 0; 956 } 957 958 static int 959 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 960 { 961 struct ifbrparam *param = arg; 962 963 sc->sc_brtmax = param->ifbrp_csize; 964 bridge_rttrim(sc); 965 966 return 0; 967 } 968 969 static int 970 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 971 { 972 struct ifbrparam *param = arg; 973 974 param->ifbrp_csize = sc->sc_brtmax; 975 976 return 0; 977 } 978 979 static int 980 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 981 { 982 struct ifbifconf *bifc = arg; 983 struct bridge_iflist *bif; 984 struct ifbreq *breqs; 985 int i, count, error = 0; 986 987 retry: 988 BRIDGE_LOCK(sc); 989 count = 0; 990 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 991 count++; 992 BRIDGE_UNLOCK(sc); 993 994 if (count == 0) { 995 bifc->ifbic_len = 0; 996 return 0; 997 } 998 999 if (bifc->ifbic_len == 0 || bifc->ifbic_len < (sizeof(*breqs) * count)) { 1000 /* Tell that a larger buffer is needed */ 1001 bifc->ifbic_len = sizeof(*breqs) * count; 1002 return 0; 1003 } 1004 1005 breqs = kmem_alloc(sizeof(*breqs) * count, KM_SLEEP); 1006 1007 BRIDGE_LOCK(sc); 1008 1009 i = 0; 1010 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 1011 i++; 1012 if (i > count) { 1013 /* 1014 * The number of members has been increased. 1015 * We need more memory! 1016 */ 1017 BRIDGE_UNLOCK(sc); 1018 kmem_free(breqs, sizeof(*breqs) * count); 1019 goto retry; 1020 } 1021 1022 i = 0; 1023 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 1024 struct ifbreq *breq = &breqs[i++]; 1025 memset(breq, 0, sizeof(*breq)); 1026 1027 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, 1028 sizeof(breq->ifbr_ifsname)); 1029 breq->ifbr_ifsflags = bif->bif_flags; 1030 breq->ifbr_state = bif->bif_state; 1031 breq->ifbr_priority = bif->bif_priority; 1032 breq->ifbr_path_cost = bif->bif_path_cost; 1033 breq->ifbr_portno = bif->bif_ifp->if_index & 0xff; 1034 } 1035 1036 /* Don't call copyout with holding the mutex */ 1037 BRIDGE_UNLOCK(sc); 1038 1039 for (i = 0; i < count; i++) { 1040 error = copyout(&breqs[i], bifc->ifbic_req + i, sizeof(*breqs)); 1041 if (error) 1042 break; 1043 } 1044 bifc->ifbic_len = sizeof(*breqs) * i; 1045 1046 kmem_free(breqs, sizeof(*breqs) * count); 1047 1048 return error; 1049 } 1050 1051 static int 1052 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1053 { 1054 struct ifbaconf *bac = arg; 1055 struct bridge_rtnode *brt; 1056 struct ifbareq bareq; 1057 int count = 0, error = 0, len; 1058 1059 if (bac->ifbac_len == 0) 1060 return 0; 1061 1062 BRIDGE_RT_LOCK(sc); 1063 1064 len = bac->ifbac_len; 1065 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 1066 if (len < sizeof(bareq)) 1067 goto out; 1068 memset(&bareq, 0, sizeof(bareq)); 1069 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1070 sizeof(bareq.ifba_ifsname)); 1071 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1072 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1073 bareq.ifba_expire = brt->brt_expire - time_uptime; 1074 } else 1075 bareq.ifba_expire = 0; 1076 bareq.ifba_flags = brt->brt_flags; 1077 1078 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1079 if (error) 1080 goto out; 1081 count++; 1082 len -= sizeof(bareq); 1083 } 1084 out: 1085 BRIDGE_RT_UNLOCK(sc); 1086 1087 bac->ifbac_len = sizeof(bareq) * count; 1088 return error; 1089 } 1090 1091 static int 1092 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1093 { 1094 struct ifbareq *req = arg; 1095 struct bridge_iflist *bif; 1096 int error; 1097 struct psref psref; 1098 1099 bif = bridge_lookup_member(sc, req->ifba_ifsname, &psref); 1100 if (bif == NULL) 1101 return ENOENT; 1102 1103 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1104 req->ifba_flags); 1105 1106 bridge_release_member(sc, bif, &psref); 1107 1108 return error; 1109 } 1110 1111 static int 1112 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1113 { 1114 struct ifbrparam *param = arg; 1115 1116 sc->sc_brttimeout = param->ifbrp_ctime; 1117 1118 return 0; 1119 } 1120 1121 static int 1122 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1123 { 1124 struct ifbrparam *param = arg; 1125 1126 param->ifbrp_ctime = sc->sc_brttimeout; 1127 1128 return 0; 1129 } 1130 1131 static int 1132 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1133 { 1134 struct ifbareq *req = arg; 1135 1136 return (bridge_rtdaddr(sc, req->ifba_dst)); 1137 } 1138 1139 static int 1140 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1141 { 1142 struct ifbreq *req = arg; 1143 1144 bridge_rtflush(sc, req->ifbr_ifsflags); 1145 1146 return 0; 1147 } 1148 1149 static int 1150 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1151 { 1152 struct ifbrparam *param = arg; 1153 1154 param->ifbrp_prio = sc->sc_bridge_priority; 1155 1156 return 0; 1157 } 1158 1159 static int 1160 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1161 { 1162 struct ifbrparam *param = arg; 1163 1164 sc->sc_bridge_priority = param->ifbrp_prio; 1165 1166 if (sc->sc_if.if_flags & IFF_RUNNING) 1167 bstp_initialization(sc); 1168 1169 return 0; 1170 } 1171 1172 static int 1173 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1174 { 1175 struct ifbrparam *param = arg; 1176 1177 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1178 1179 return 0; 1180 } 1181 1182 static int 1183 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1184 { 1185 struct ifbrparam *param = arg; 1186 1187 if (param->ifbrp_hellotime == 0) 1188 return EINVAL; 1189 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1190 1191 if (sc->sc_if.if_flags & IFF_RUNNING) 1192 bstp_initialization(sc); 1193 1194 return 0; 1195 } 1196 1197 static int 1198 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1199 { 1200 struct ifbrparam *param = arg; 1201 1202 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1203 1204 return 0; 1205 } 1206 1207 static int 1208 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1209 { 1210 struct ifbrparam *param = arg; 1211 1212 if (param->ifbrp_fwddelay == 0) 1213 return EINVAL; 1214 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1215 1216 if (sc->sc_if.if_flags & IFF_RUNNING) 1217 bstp_initialization(sc); 1218 1219 return 0; 1220 } 1221 1222 static int 1223 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1224 { 1225 struct ifbrparam *param = arg; 1226 1227 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1228 1229 return 0; 1230 } 1231 1232 static int 1233 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1234 { 1235 struct ifbrparam *param = arg; 1236 1237 if (param->ifbrp_maxage == 0) 1238 return EINVAL; 1239 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1240 1241 if (sc->sc_if.if_flags & IFF_RUNNING) 1242 bstp_initialization(sc); 1243 1244 return 0; 1245 } 1246 1247 static int 1248 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1249 { 1250 struct ifbreq *req = arg; 1251 struct bridge_iflist *bif; 1252 struct psref psref; 1253 1254 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1255 if (bif == NULL) 1256 return ENOENT; 1257 1258 bif->bif_priority = req->ifbr_priority; 1259 1260 if (sc->sc_if.if_flags & IFF_RUNNING) 1261 bstp_initialization(sc); 1262 1263 bridge_release_member(sc, bif, &psref); 1264 1265 return 0; 1266 } 1267 1268 #if defined(BRIDGE_IPF) 1269 static int 1270 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1271 { 1272 struct ifbrparam *param = arg; 1273 1274 param->ifbrp_filter = sc->sc_filter_flags; 1275 1276 return 0; 1277 } 1278 1279 static int 1280 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1281 { 1282 struct ifbrparam *param = arg; 1283 uint32_t nflags, oflags; 1284 1285 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1286 return EINVAL; 1287 1288 nflags = param->ifbrp_filter; 1289 oflags = sc->sc_filter_flags; 1290 1291 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1292 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1293 sc->sc_if.if_pfil); 1294 } 1295 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1296 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1297 sc->sc_if.if_pfil); 1298 } 1299 1300 sc->sc_filter_flags = nflags; 1301 1302 return 0; 1303 } 1304 #endif /* BRIDGE_IPF */ 1305 1306 static int 1307 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1308 { 1309 struct ifbreq *req = arg; 1310 struct bridge_iflist *bif; 1311 struct psref psref; 1312 1313 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1314 if (bif == NULL) 1315 return ENOENT; 1316 1317 bif->bif_path_cost = req->ifbr_path_cost; 1318 1319 if (sc->sc_if.if_flags & IFF_RUNNING) 1320 bstp_initialization(sc); 1321 1322 bridge_release_member(sc, bif, &psref); 1323 1324 return 0; 1325 } 1326 1327 /* 1328 * bridge_ifdetach: 1329 * 1330 * Detach an interface from a bridge. Called when a member 1331 * interface is detaching. 1332 */ 1333 void 1334 bridge_ifdetach(struct ifnet *ifp) 1335 { 1336 struct bridge_softc *sc = ifp->if_bridge; 1337 struct ifbreq breq; 1338 1339 /* ioctl_lock should prevent this from happening */ 1340 KASSERT(sc != NULL); 1341 1342 memset(&breq, 0, sizeof(breq)); 1343 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1344 1345 (void) bridge_ioctl_del(sc, &breq); 1346 } 1347 1348 /* 1349 * bridge_init: 1350 * 1351 * Initialize a bridge interface. 1352 */ 1353 static int 1354 bridge_init(struct ifnet *ifp) 1355 { 1356 struct bridge_softc *sc = ifp->if_softc; 1357 1358 KASSERT((ifp->if_flags & IFF_RUNNING) == 0); 1359 1360 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1361 bridge_timer, sc); 1362 bstp_initialization(sc); 1363 1364 ifp->if_flags |= IFF_RUNNING; 1365 return 0; 1366 } 1367 1368 /* 1369 * bridge_stop: 1370 * 1371 * Stop the bridge interface. 1372 */ 1373 static void 1374 bridge_stop(struct ifnet *ifp, int disable) 1375 { 1376 struct bridge_softc *sc = ifp->if_softc; 1377 1378 KASSERT((ifp->if_flags & IFF_RUNNING) != 0); 1379 ifp->if_flags &= ~IFF_RUNNING; 1380 1381 callout_halt(&sc->sc_brcallout, NULL); 1382 workqueue_wait(sc->sc_rtage_wq, &sc->sc_rtage_wk); 1383 bstp_stop(sc); 1384 bridge_rtflush(sc, IFBF_FLUSHDYN); 1385 } 1386 1387 /* 1388 * bridge_enqueue: 1389 * 1390 * Enqueue a packet on a bridge member interface. 1391 */ 1392 void 1393 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1394 int runfilt) 1395 { 1396 int len, error; 1397 short mflags; 1398 1399 /* 1400 * Clear any in-bound checksum flags for this packet. 1401 */ 1402 m->m_pkthdr.csum_flags = 0; 1403 1404 if (runfilt) { 1405 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1406 dst_ifp, PFIL_OUT) != 0) { 1407 if (m != NULL) 1408 m_freem(m); 1409 return; 1410 } 1411 if (m == NULL) 1412 return; 1413 } 1414 1415 #ifdef ALTQ 1416 KERNEL_LOCK(1, NULL); 1417 /* 1418 * If ALTQ is enabled on the member interface, do 1419 * classification; the queueing discipline might 1420 * not require classification, but might require 1421 * the address family/header pointer in the pktattr. 1422 */ 1423 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1424 /* XXX IFT_ETHER */ 1425 altq_etherclassify(&dst_ifp->if_snd, m); 1426 } 1427 KERNEL_UNLOCK_ONE(NULL); 1428 #endif /* ALTQ */ 1429 1430 len = m->m_pkthdr.len; 1431 mflags = m->m_flags; 1432 1433 error = if_transmit_lock(dst_ifp, m); 1434 if (error) { 1435 /* mbuf is already freed */ 1436 sc->sc_if.if_oerrors++; 1437 return; 1438 } 1439 1440 sc->sc_if.if_opackets++; 1441 sc->sc_if.if_obytes += len; 1442 if (mflags & M_MCAST) 1443 sc->sc_if.if_omcasts++; 1444 } 1445 1446 /* 1447 * bridge_output: 1448 * 1449 * Send output from a bridge member interface. This 1450 * performs the bridging function for locally originated 1451 * packets. 1452 * 1453 * The mbuf has the Ethernet header already attached. We must 1454 * enqueue or free the mbuf before returning. 1455 */ 1456 int 1457 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1458 const struct rtentry *rt) 1459 { 1460 struct ether_header *eh; 1461 struct ifnet *dst_if; 1462 struct bridge_softc *sc; 1463 int s; 1464 1465 /* 1466 * bridge_output() is called from ether_output(), furthermore 1467 * ifp argument doesn't point to bridge(4). So, don't assert 1468 * IFEF_MPSAFE here. 1469 */ 1470 1471 if (m->m_len < ETHER_HDR_LEN) { 1472 m = m_pullup(m, ETHER_HDR_LEN); 1473 if (m == NULL) 1474 return 0; 1475 } 1476 1477 eh = mtod(m, struct ether_header *); 1478 sc = ifp->if_bridge; 1479 1480 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1481 if (memcmp(etherbroadcastaddr, 1482 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1483 m->m_flags |= M_BCAST; 1484 else 1485 m->m_flags |= M_MCAST; 1486 } 1487 1488 /* 1489 * If bridge is down, but the original output interface is up, 1490 * go ahead and send out that interface. Otherwise, the packet 1491 * is dropped below. 1492 */ 1493 if (__predict_false(sc == NULL) || 1494 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1495 dst_if = ifp; 1496 goto sendunicast; 1497 } 1498 1499 /* 1500 * If the packet is a multicast, or we don't know a better way to 1501 * get there, send to all interfaces. 1502 */ 1503 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0) 1504 dst_if = NULL; 1505 else 1506 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1507 if (dst_if == NULL) { 1508 /* XXX Should call bridge_broadcast, but there are locking 1509 * issues which need resolving first. */ 1510 struct bridge_iflist *bif; 1511 struct mbuf *mc; 1512 bool used = false; 1513 1514 BRIDGE_PSZ_RENTER(s); 1515 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1516 struct psref psref; 1517 1518 bridge_acquire_member(sc, bif, &psref); 1519 BRIDGE_PSZ_REXIT(s); 1520 1521 dst_if = bif->bif_ifp; 1522 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1523 goto next; 1524 1525 /* 1526 * If this is not the original output interface, 1527 * and the interface is participating in spanning 1528 * tree, make sure the port is in a state that 1529 * allows forwarding. 1530 */ 1531 if (dst_if != ifp && 1532 (bif->bif_flags & IFBIF_STP) != 0) { 1533 switch (bif->bif_state) { 1534 case BSTP_IFSTATE_BLOCKING: 1535 case BSTP_IFSTATE_LISTENING: 1536 case BSTP_IFSTATE_DISABLED: 1537 goto next; 1538 } 1539 } 1540 1541 if (PSLIST_READER_NEXT(bif, struct bridge_iflist, 1542 bif_next) == NULL && 1543 ((m->m_flags & (M_MCAST | M_BCAST)) == 0 || 1544 dst_if == ifp)) 1545 { 1546 used = true; 1547 mc = m; 1548 } else { 1549 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1550 if (mc == NULL) { 1551 sc->sc_if.if_oerrors++; 1552 goto next; 1553 } 1554 } 1555 1556 bridge_enqueue(sc, dst_if, mc, 0); 1557 1558 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0 && 1559 dst_if != ifp) 1560 { 1561 if (PSLIST_READER_NEXT(bif, 1562 struct bridge_iflist, bif_next) == NULL) 1563 { 1564 used = true; 1565 mc = m; 1566 } else { 1567 mc = m_copym(m, 0, M_COPYALL, 1568 M_DONTWAIT); 1569 if (mc == NULL) { 1570 sc->sc_if.if_oerrors++; 1571 goto next; 1572 } 1573 } 1574 1575 m_set_rcvif(mc, dst_if); 1576 mc->m_flags &= ~M_PROMISC; 1577 1578 #ifndef NET_MPSAFE 1579 s = splsoftnet(); 1580 #endif 1581 ether_input(dst_if, mc); 1582 #ifndef NET_MPSAFE 1583 splx(s); 1584 #endif 1585 } 1586 1587 next: 1588 BRIDGE_PSZ_RENTER(s); 1589 bridge_release_member(sc, bif, &psref); 1590 1591 /* Guarantee we don't re-enter the loop as we already 1592 * decided we're at the end. */ 1593 if (used) 1594 break; 1595 } 1596 BRIDGE_PSZ_REXIT(s); 1597 1598 if (!used) 1599 m_freem(m); 1600 return 0; 1601 } 1602 1603 sendunicast: 1604 /* 1605 * XXX Spanning tree consideration here? 1606 */ 1607 1608 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1609 m_freem(m); 1610 return 0; 1611 } 1612 1613 bridge_enqueue(sc, dst_if, m, 0); 1614 1615 return 0; 1616 } 1617 1618 /* 1619 * bridge_start: 1620 * 1621 * Start output on a bridge. 1622 * 1623 * NOTE: This routine should never be called in this implementation. 1624 */ 1625 static void 1626 bridge_start(struct ifnet *ifp) 1627 { 1628 1629 printf("%s: bridge_start() called\n", ifp->if_xname); 1630 } 1631 1632 /* 1633 * bridge_forward: 1634 * 1635 * The forwarding function of the bridge. 1636 */ 1637 static void 1638 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1639 { 1640 struct bridge_iflist *bif; 1641 struct ifnet *src_if, *dst_if; 1642 struct ether_header *eh; 1643 struct psref psref; 1644 struct psref psref_src; 1645 DECLARE_LOCK_VARIABLE; 1646 1647 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1648 return; 1649 1650 src_if = m_get_rcvif_psref(m, &psref_src); 1651 if (src_if == NULL) { 1652 /* Interface is being destroyed? */ 1653 m_freem(m); 1654 goto out; 1655 } 1656 1657 sc->sc_if.if_ipackets++; 1658 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1659 1660 /* 1661 * Look up the bridge_iflist. 1662 */ 1663 bif = bridge_lookup_member_if(sc, src_if, &psref); 1664 if (bif == NULL) { 1665 /* Interface is not a bridge member (anymore?) */ 1666 m_freem(m); 1667 goto out; 1668 } 1669 1670 if (bif->bif_flags & IFBIF_STP) { 1671 switch (bif->bif_state) { 1672 case BSTP_IFSTATE_BLOCKING: 1673 case BSTP_IFSTATE_LISTENING: 1674 case BSTP_IFSTATE_DISABLED: 1675 m_freem(m); 1676 bridge_release_member(sc, bif, &psref); 1677 goto out; 1678 } 1679 } 1680 1681 eh = mtod(m, struct ether_header *); 1682 1683 /* 1684 * If the interface is learning, and the source 1685 * address is valid and not multicast, record 1686 * the address. 1687 */ 1688 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1689 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1690 (eh->ether_shost[0] == 0 && 1691 eh->ether_shost[1] == 0 && 1692 eh->ether_shost[2] == 0 && 1693 eh->ether_shost[3] == 0 && 1694 eh->ether_shost[4] == 0 && 1695 eh->ether_shost[5] == 0) == 0) { 1696 (void) bridge_rtupdate(sc, eh->ether_shost, 1697 src_if, 0, IFBAF_DYNAMIC); 1698 } 1699 1700 if ((bif->bif_flags & IFBIF_STP) != 0 && 1701 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1702 m_freem(m); 1703 bridge_release_member(sc, bif, &psref); 1704 goto out; 1705 } 1706 1707 bridge_release_member(sc, bif, &psref); 1708 1709 /* 1710 * At this point, the port either doesn't participate 1711 * in spanning tree or it is in the forwarding state. 1712 */ 1713 1714 /* 1715 * If the packet is unicast, destined for someone on 1716 * "this" side of the bridge, drop it. 1717 */ 1718 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1719 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1720 if (src_if == dst_if) { 1721 m_freem(m); 1722 goto out; 1723 } 1724 } else { 1725 /* ...forward it to all interfaces. */ 1726 sc->sc_if.if_imcasts++; 1727 dst_if = NULL; 1728 } 1729 1730 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, src_if, PFIL_IN) != 0) { 1731 if (m != NULL) 1732 m_freem(m); 1733 goto out; 1734 } 1735 if (m == NULL) 1736 goto out; 1737 1738 if (dst_if == NULL) { 1739 bridge_broadcast(sc, src_if, m); 1740 goto out; 1741 } 1742 1743 m_put_rcvif_psref(src_if, &psref_src); 1744 src_if = NULL; 1745 1746 /* 1747 * At this point, we're dealing with a unicast frame 1748 * going to a different interface. 1749 */ 1750 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1751 m_freem(m); 1752 goto out; 1753 } 1754 1755 bif = bridge_lookup_member_if(sc, dst_if, &psref); 1756 if (bif == NULL) { 1757 /* Not a member of the bridge (anymore?) */ 1758 m_freem(m); 1759 goto out; 1760 } 1761 1762 if (bif->bif_flags & IFBIF_STP) { 1763 switch (bif->bif_state) { 1764 case BSTP_IFSTATE_DISABLED: 1765 case BSTP_IFSTATE_BLOCKING: 1766 m_freem(m); 1767 bridge_release_member(sc, bif, &psref); 1768 goto out; 1769 } 1770 } 1771 1772 bridge_release_member(sc, bif, &psref); 1773 1774 ACQUIRE_GLOBAL_LOCKS(); 1775 bridge_enqueue(sc, dst_if, m, 1); 1776 RELEASE_GLOBAL_LOCKS(); 1777 out: 1778 if (src_if != NULL) 1779 m_put_rcvif_psref(src_if, &psref_src); 1780 return; 1781 } 1782 1783 static bool 1784 bstp_state_before_learning(struct bridge_iflist *bif) 1785 { 1786 if (bif->bif_flags & IFBIF_STP) { 1787 switch (bif->bif_state) { 1788 case BSTP_IFSTATE_BLOCKING: 1789 case BSTP_IFSTATE_LISTENING: 1790 case BSTP_IFSTATE_DISABLED: 1791 return true; 1792 } 1793 } 1794 return false; 1795 } 1796 1797 static bool 1798 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1799 { 1800 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1801 1802 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1803 #if NCARP > 0 1804 || (bif->bif_ifp->if_carp && 1805 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1806 #endif /* NCARP > 0 */ 1807 ) 1808 return true; 1809 1810 return false; 1811 } 1812 1813 /* 1814 * bridge_input: 1815 * 1816 * Receive input from a member interface. Queue the packet for 1817 * bridging if it is not for us. 1818 */ 1819 static void 1820 bridge_input(struct ifnet *ifp, struct mbuf *m) 1821 { 1822 struct bridge_softc *sc = ifp->if_bridge; 1823 struct bridge_iflist *bif; 1824 struct ether_header *eh; 1825 struct psref psref; 1826 int bound; 1827 DECLARE_LOCK_VARIABLE; 1828 1829 KASSERT(!cpu_intr_p()); 1830 1831 if (__predict_false(sc == NULL) || 1832 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1833 ACQUIRE_GLOBAL_LOCKS(); 1834 ether_input(ifp, m); 1835 RELEASE_GLOBAL_LOCKS(); 1836 return; 1837 } 1838 1839 bound = curlwp_bind(); 1840 bif = bridge_lookup_member_if(sc, ifp, &psref); 1841 if (bif == NULL) { 1842 curlwp_bindx(bound); 1843 ACQUIRE_GLOBAL_LOCKS(); 1844 ether_input(ifp, m); 1845 RELEASE_GLOBAL_LOCKS(); 1846 return; 1847 } 1848 1849 eh = mtod(m, struct ether_header *); 1850 1851 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1852 if (memcmp(etherbroadcastaddr, 1853 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1854 m->m_flags |= M_BCAST; 1855 else 1856 m->m_flags |= M_MCAST; 1857 } 1858 1859 /* 1860 * A 'fast' path for packets addressed to interfaces that are 1861 * part of this bridge. 1862 */ 1863 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 1864 !bstp_state_before_learning(bif)) { 1865 struct bridge_iflist *_bif; 1866 struct ifnet *_ifp = NULL; 1867 int s; 1868 struct psref _psref; 1869 1870 BRIDGE_PSZ_RENTER(s); 1871 BRIDGE_IFLIST_READER_FOREACH(_bif, sc) { 1872 /* It is destined for us. */ 1873 if (bridge_ourether(_bif, eh, 0)) { 1874 bridge_acquire_member(sc, _bif, &_psref); 1875 BRIDGE_PSZ_REXIT(s); 1876 if (_bif->bif_flags & IFBIF_LEARNING) 1877 (void) bridge_rtupdate(sc, 1878 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1879 m_set_rcvif(m, _bif->bif_ifp); 1880 _ifp = _bif->bif_ifp; 1881 bridge_release_member(sc, _bif, &_psref); 1882 goto out; 1883 } 1884 1885 /* We just received a packet that we sent out. */ 1886 if (bridge_ourether(_bif, eh, 1)) 1887 break; 1888 } 1889 BRIDGE_PSZ_REXIT(s); 1890 out: 1891 1892 if (_bif != NULL) { 1893 bridge_release_member(sc, bif, &psref); 1894 curlwp_bindx(bound); 1895 if (_ifp != NULL) { 1896 m->m_flags &= ~M_PROMISC; 1897 ACQUIRE_GLOBAL_LOCKS(); 1898 ether_input(_ifp, m); 1899 RELEASE_GLOBAL_LOCKS(); 1900 } else 1901 m_freem(m); 1902 return; 1903 } 1904 } 1905 1906 /* Tap off 802.1D packets; they do not get forwarded. */ 1907 if (bif->bif_flags & IFBIF_STP && 1908 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 1909 bstp_input(sc, bif, m); 1910 bridge_release_member(sc, bif, &psref); 1911 curlwp_bindx(bound); 1912 return; 1913 } 1914 1915 /* 1916 * A normal switch would discard the packet here, but that's not what 1917 * we've done historically. This also prevents some obnoxious behaviour. 1918 */ 1919 if (bstp_state_before_learning(bif)) { 1920 bridge_release_member(sc, bif, &psref); 1921 curlwp_bindx(bound); 1922 ACQUIRE_GLOBAL_LOCKS(); 1923 ether_input(ifp, m); 1924 RELEASE_GLOBAL_LOCKS(); 1925 return; 1926 } 1927 1928 bridge_release_member(sc, bif, &psref); 1929 1930 bridge_forward(sc, m); 1931 1932 curlwp_bindx(bound); 1933 } 1934 1935 /* 1936 * bridge_broadcast: 1937 * 1938 * Send a frame to all interfaces that are members of 1939 * the bridge, except for the one on which the packet 1940 * arrived. 1941 */ 1942 static void 1943 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1944 struct mbuf *m) 1945 { 1946 struct bridge_iflist *bif; 1947 struct mbuf *mc; 1948 struct ifnet *dst_if; 1949 bool bmcast; 1950 int s; 1951 DECLARE_LOCK_VARIABLE; 1952 1953 bmcast = m->m_flags & (M_BCAST|M_MCAST); 1954 1955 BRIDGE_PSZ_RENTER(s); 1956 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1957 struct psref psref; 1958 1959 bridge_acquire_member(sc, bif, &psref); 1960 BRIDGE_PSZ_REXIT(s); 1961 1962 dst_if = bif->bif_ifp; 1963 1964 if (bif->bif_flags & IFBIF_STP) { 1965 switch (bif->bif_state) { 1966 case BSTP_IFSTATE_BLOCKING: 1967 case BSTP_IFSTATE_DISABLED: 1968 goto next; 1969 } 1970 } 1971 1972 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 1973 goto next; 1974 1975 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1976 goto next; 1977 1978 if (dst_if != src_if) { 1979 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1980 if (mc == NULL) { 1981 sc->sc_if.if_oerrors++; 1982 goto next; 1983 } 1984 ACQUIRE_GLOBAL_LOCKS(); 1985 bridge_enqueue(sc, dst_if, mc, 1); 1986 RELEASE_GLOBAL_LOCKS(); 1987 } 1988 1989 if (bmcast) { 1990 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1991 if (mc == NULL) { 1992 sc->sc_if.if_oerrors++; 1993 goto next; 1994 } 1995 1996 m_set_rcvif(mc, dst_if); 1997 mc->m_flags &= ~M_PROMISC; 1998 1999 ACQUIRE_GLOBAL_LOCKS(); 2000 ether_input(dst_if, mc); 2001 RELEASE_GLOBAL_LOCKS(); 2002 } 2003 next: 2004 BRIDGE_PSZ_RENTER(s); 2005 bridge_release_member(sc, bif, &psref); 2006 } 2007 BRIDGE_PSZ_REXIT(s); 2008 2009 m_freem(m); 2010 } 2011 2012 static int 2013 bridge_rtalloc(struct bridge_softc *sc, const uint8_t *dst, 2014 struct bridge_rtnode **brtp) 2015 { 2016 struct bridge_rtnode *brt; 2017 int error; 2018 2019 if (sc->sc_brtcnt >= sc->sc_brtmax) 2020 return ENOSPC; 2021 2022 /* 2023 * Allocate a new bridge forwarding node, and 2024 * initialize the expiration time and Ethernet 2025 * address. 2026 */ 2027 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 2028 if (brt == NULL) 2029 return ENOMEM; 2030 2031 memset(brt, 0, sizeof(*brt)); 2032 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2033 brt->brt_flags = IFBAF_DYNAMIC; 2034 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2035 PSLIST_ENTRY_INIT(brt, brt_list); 2036 PSLIST_ENTRY_INIT(brt, brt_hash); 2037 2038 BRIDGE_RT_LOCK(sc); 2039 error = bridge_rtnode_insert(sc, brt); 2040 BRIDGE_RT_UNLOCK(sc); 2041 2042 if (error != 0) { 2043 pool_put(&bridge_rtnode_pool, brt); 2044 return error; 2045 } 2046 2047 *brtp = brt; 2048 return 0; 2049 } 2050 2051 /* 2052 * bridge_rtupdate: 2053 * 2054 * Add a bridge routing entry. 2055 */ 2056 static int 2057 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 2058 struct ifnet *dst_if, int setflags, uint8_t flags) 2059 { 2060 struct bridge_rtnode *brt; 2061 int s; 2062 2063 again: 2064 /* 2065 * A route for this destination might already exist. If so, 2066 * update it, otherwise create a new one. 2067 */ 2068 BRIDGE_RT_RENTER(s); 2069 brt = bridge_rtnode_lookup(sc, dst); 2070 2071 if (brt != NULL) { 2072 brt->brt_ifp = dst_if; 2073 if (setflags) { 2074 brt->brt_flags = flags; 2075 if (flags & IFBAF_STATIC) 2076 brt->brt_expire = 0; 2077 else 2078 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2079 } else { 2080 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2081 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2082 } 2083 } 2084 BRIDGE_RT_REXIT(s); 2085 2086 if (brt == NULL) { 2087 int r; 2088 2089 r = bridge_rtalloc(sc, dst, &brt); 2090 if (r != 0) 2091 return r; 2092 goto again; 2093 } 2094 2095 return 0; 2096 } 2097 2098 /* 2099 * bridge_rtlookup: 2100 * 2101 * Lookup the destination interface for an address. 2102 */ 2103 static struct ifnet * 2104 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2105 { 2106 struct bridge_rtnode *brt; 2107 struct ifnet *ifs = NULL; 2108 int s; 2109 2110 BRIDGE_RT_RENTER(s); 2111 brt = bridge_rtnode_lookup(sc, addr); 2112 if (brt != NULL) 2113 ifs = brt->brt_ifp; 2114 BRIDGE_RT_REXIT(s); 2115 2116 return ifs; 2117 } 2118 2119 typedef bool (*bridge_iterate_cb_t) 2120 (struct bridge_softc *, struct bridge_rtnode *, bool *, void *); 2121 2122 /* 2123 * bridge_rtlist_iterate_remove: 2124 * 2125 * It iterates on sc->sc_rtlist and removes rtnodes of it which func 2126 * callback judges to remove. Removals of rtnodes are done in a manner 2127 * of pserialize. To this end, all kmem_* operations are placed out of 2128 * mutexes. 2129 */ 2130 static void 2131 bridge_rtlist_iterate_remove(struct bridge_softc *sc, bridge_iterate_cb_t func, void *arg) 2132 { 2133 struct bridge_rtnode *brt; 2134 struct bridge_rtnode **brt_list; 2135 int i, count; 2136 2137 retry: 2138 count = sc->sc_brtcnt; 2139 if (count == 0) 2140 return; 2141 brt_list = kmem_alloc(sizeof(*brt_list) * count, KM_SLEEP); 2142 2143 BRIDGE_RT_LOCK(sc); 2144 if (__predict_false(sc->sc_brtcnt > count)) { 2145 /* The rtnodes increased, we need more memory */ 2146 BRIDGE_RT_UNLOCK(sc); 2147 kmem_free(brt_list, sizeof(*brt_list) * count); 2148 goto retry; 2149 } 2150 2151 i = 0; 2152 /* 2153 * We don't need to use a _SAFE variant here because we know 2154 * that a removed item keeps its next pointer as-is thanks to 2155 * pslist(9) and isn't freed in the loop. 2156 */ 2157 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 2158 bool need_break = false; 2159 if (func(sc, brt, &need_break, arg)) { 2160 bridge_rtnode_remove(sc, brt); 2161 brt_list[i++] = brt; 2162 } 2163 if (need_break) 2164 break; 2165 } 2166 2167 if (i > 0) 2168 BRIDGE_RT_PSZ_PERFORM(sc); 2169 BRIDGE_RT_UNLOCK(sc); 2170 2171 while (--i >= 0) 2172 bridge_rtnode_destroy(brt_list[i]); 2173 2174 kmem_free(brt_list, sizeof(*brt_list) * count); 2175 } 2176 2177 static bool 2178 bridge_rttrim0_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2179 bool *need_break, void *arg) 2180 { 2181 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2182 /* Take into account of the subsequent removal */ 2183 if ((sc->sc_brtcnt - 1) <= sc->sc_brtmax) 2184 *need_break = true; 2185 return true; 2186 } else 2187 return false; 2188 } 2189 2190 static void 2191 bridge_rttrim0(struct bridge_softc *sc) 2192 { 2193 bridge_rtlist_iterate_remove(sc, bridge_rttrim0_cb, NULL); 2194 } 2195 2196 /* 2197 * bridge_rttrim: 2198 * 2199 * Trim the routine table so that we have a number 2200 * of routing entries less than or equal to the 2201 * maximum number. 2202 */ 2203 static void 2204 bridge_rttrim(struct bridge_softc *sc) 2205 { 2206 2207 /* Make sure we actually need to do this. */ 2208 if (sc->sc_brtcnt <= sc->sc_brtmax) 2209 return; 2210 2211 /* Force an aging cycle; this might trim enough addresses. */ 2212 bridge_rtage(sc); 2213 if (sc->sc_brtcnt <= sc->sc_brtmax) 2214 return; 2215 2216 bridge_rttrim0(sc); 2217 2218 return; 2219 } 2220 2221 /* 2222 * bridge_timer: 2223 * 2224 * Aging timer for the bridge. 2225 */ 2226 static void 2227 bridge_timer(void *arg) 2228 { 2229 struct bridge_softc *sc = arg; 2230 2231 workqueue_enqueue(sc->sc_rtage_wq, &sc->sc_rtage_wk, NULL); 2232 } 2233 2234 static void 2235 bridge_rtage_work(struct work *wk, void *arg) 2236 { 2237 struct bridge_softc *sc = arg; 2238 2239 KASSERT(wk == &sc->sc_rtage_wk); 2240 2241 bridge_rtage(sc); 2242 2243 if (sc->sc_if.if_flags & IFF_RUNNING) 2244 callout_reset(&sc->sc_brcallout, 2245 bridge_rtable_prune_period * hz, bridge_timer, sc); 2246 } 2247 2248 static bool 2249 bridge_rtage_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2250 bool *need_break, void *arg) 2251 { 2252 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2253 time_uptime >= brt->brt_expire) 2254 return true; 2255 else 2256 return false; 2257 } 2258 2259 /* 2260 * bridge_rtage: 2261 * 2262 * Perform an aging cycle. 2263 */ 2264 static void 2265 bridge_rtage(struct bridge_softc *sc) 2266 { 2267 bridge_rtlist_iterate_remove(sc, bridge_rtage_cb, NULL); 2268 } 2269 2270 2271 static bool 2272 bridge_rtflush_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2273 bool *need_break, void *arg) 2274 { 2275 int full = *(int*)arg; 2276 2277 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2278 return true; 2279 else 2280 return false; 2281 } 2282 2283 /* 2284 * bridge_rtflush: 2285 * 2286 * Remove all dynamic addresses from the bridge. 2287 */ 2288 static void 2289 bridge_rtflush(struct bridge_softc *sc, int full) 2290 { 2291 bridge_rtlist_iterate_remove(sc, bridge_rtflush_cb, &full); 2292 } 2293 2294 /* 2295 * bridge_rtdaddr: 2296 * 2297 * Remove an address from the table. 2298 */ 2299 static int 2300 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2301 { 2302 struct bridge_rtnode *brt; 2303 2304 BRIDGE_RT_LOCK(sc); 2305 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2306 BRIDGE_RT_UNLOCK(sc); 2307 return ENOENT; 2308 } 2309 bridge_rtnode_remove(sc, brt); 2310 BRIDGE_RT_PSZ_PERFORM(sc); 2311 BRIDGE_RT_UNLOCK(sc); 2312 2313 bridge_rtnode_destroy(brt); 2314 2315 return 0; 2316 } 2317 2318 /* 2319 * bridge_rtdelete: 2320 * 2321 * Delete routes to a speicifc member interface. 2322 */ 2323 static void 2324 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2325 { 2326 struct bridge_rtnode *brt; 2327 2328 /* XXX pserialize_perform for each entry is slow */ 2329 again: 2330 BRIDGE_RT_LOCK(sc); 2331 BRIDGE_RTLIST_WRITER_FOREACH(brt, sc) { 2332 if (brt->brt_ifp == ifp) 2333 break; 2334 } 2335 if (brt == NULL) { 2336 BRIDGE_RT_UNLOCK(sc); 2337 return; 2338 } 2339 bridge_rtnode_remove(sc, brt); 2340 BRIDGE_RT_PSZ_PERFORM(sc); 2341 BRIDGE_RT_UNLOCK(sc); 2342 2343 bridge_rtnode_destroy(brt); 2344 2345 goto again; 2346 } 2347 2348 /* 2349 * bridge_rtable_init: 2350 * 2351 * Initialize the route table for this bridge. 2352 */ 2353 static void 2354 bridge_rtable_init(struct bridge_softc *sc) 2355 { 2356 int i; 2357 2358 sc->sc_rthash = kmem_alloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2359 KM_SLEEP); 2360 2361 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2362 PSLIST_INIT(&sc->sc_rthash[i]); 2363 2364 sc->sc_rthash_key = cprng_fast32(); 2365 2366 PSLIST_INIT(&sc->sc_rtlist); 2367 2368 sc->sc_rtlist_psz = pserialize_create(); 2369 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 2370 } 2371 2372 /* 2373 * bridge_rtable_fini: 2374 * 2375 * Deconstruct the route table for this bridge. 2376 */ 2377 static void 2378 bridge_rtable_fini(struct bridge_softc *sc) 2379 { 2380 2381 kmem_free(sc->sc_rthash, sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE); 2382 mutex_obj_free(sc->sc_rtlist_lock); 2383 pserialize_destroy(sc->sc_rtlist_psz); 2384 } 2385 2386 /* 2387 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2388 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2389 */ 2390 #define mix(a, b, c) \ 2391 do { \ 2392 a -= b; a -= c; a ^= (c >> 13); \ 2393 b -= c; b -= a; b ^= (a << 8); \ 2394 c -= a; c -= b; c ^= (b >> 13); \ 2395 a -= b; a -= c; a ^= (c >> 12); \ 2396 b -= c; b -= a; b ^= (a << 16); \ 2397 c -= a; c -= b; c ^= (b >> 5); \ 2398 a -= b; a -= c; a ^= (c >> 3); \ 2399 b -= c; b -= a; b ^= (a << 10); \ 2400 c -= a; c -= b; c ^= (b >> 15); \ 2401 } while (/*CONSTCOND*/0) 2402 2403 static inline uint32_t 2404 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2405 { 2406 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2407 2408 b += addr[5] << 8; 2409 b += addr[4]; 2410 a += addr[3] << 24; 2411 a += addr[2] << 16; 2412 a += addr[1] << 8; 2413 a += addr[0]; 2414 2415 mix(a, b, c); 2416 2417 return (c & BRIDGE_RTHASH_MASK); 2418 } 2419 2420 #undef mix 2421 2422 /* 2423 * bridge_rtnode_lookup: 2424 * 2425 * Look up a bridge route node for the specified destination. 2426 */ 2427 static struct bridge_rtnode * 2428 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2429 { 2430 struct bridge_rtnode *brt; 2431 uint32_t hash; 2432 int dir; 2433 2434 hash = bridge_rthash(sc, addr); 2435 BRIDGE_RTHASH_READER_FOREACH(brt, sc, hash) { 2436 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2437 if (dir == 0) 2438 return brt; 2439 if (dir > 0) 2440 return NULL; 2441 } 2442 2443 return NULL; 2444 } 2445 2446 /* 2447 * bridge_rtnode_insert: 2448 * 2449 * Insert the specified bridge node into the route table. We 2450 * assume the entry is not already in the table. 2451 */ 2452 static int 2453 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2454 { 2455 struct bridge_rtnode *lbrt, *prev = NULL; 2456 uint32_t hash; 2457 2458 KASSERT(BRIDGE_RT_LOCKED(sc)); 2459 2460 hash = bridge_rthash(sc, brt->brt_addr); 2461 BRIDGE_RTHASH_WRITER_FOREACH(lbrt, sc, hash) { 2462 int dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2463 if (dir == 0) 2464 return EEXIST; 2465 if (dir > 0) 2466 break; 2467 prev = lbrt; 2468 } 2469 if (prev == NULL) 2470 BRIDGE_RTHASH_WRITER_INSERT_HEAD(sc, hash, brt); 2471 else 2472 BRIDGE_RTHASH_WRITER_INSERT_AFTER(prev, brt); 2473 2474 BRIDGE_RTLIST_WRITER_INSERT_HEAD(sc, brt); 2475 sc->sc_brtcnt++; 2476 2477 return 0; 2478 } 2479 2480 /* 2481 * bridge_rtnode_remove: 2482 * 2483 * Remove a bridge rtnode from the rthash and the rtlist of a bridge. 2484 */ 2485 static void 2486 bridge_rtnode_remove(struct bridge_softc *sc, struct bridge_rtnode *brt) 2487 { 2488 2489 KASSERT(BRIDGE_RT_LOCKED(sc)); 2490 2491 BRIDGE_RTHASH_WRITER_REMOVE(brt); 2492 BRIDGE_RTLIST_WRITER_REMOVE(brt); 2493 sc->sc_brtcnt--; 2494 } 2495 2496 /* 2497 * bridge_rtnode_destroy: 2498 * 2499 * Destroy a bridge rtnode. 2500 */ 2501 static void 2502 bridge_rtnode_destroy(struct bridge_rtnode *brt) 2503 { 2504 2505 PSLIST_ENTRY_DESTROY(brt, brt_list); 2506 PSLIST_ENTRY_DESTROY(brt, brt_hash); 2507 pool_put(&bridge_rtnode_pool, brt); 2508 } 2509 2510 #if defined(BRIDGE_IPF) 2511 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2512 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2513 2514 /* 2515 * Send bridge packets through IPF if they are one of the types IPF can deal 2516 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2517 * question.) 2518 */ 2519 static int 2520 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2521 { 2522 int snap, error; 2523 struct ether_header *eh1, eh2; 2524 struct llc llc1; 2525 uint16_t ether_type; 2526 2527 snap = 0; 2528 error = -1; /* Default error if not error == 0 */ 2529 eh1 = mtod(*mp, struct ether_header *); 2530 ether_type = ntohs(eh1->ether_type); 2531 2532 /* 2533 * Check for SNAP/LLC. 2534 */ 2535 if (ether_type < ETHERMTU) { 2536 struct llc *llc2 = (struct llc *)(eh1 + 1); 2537 2538 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2539 llc2->llc_dsap == LLC_SNAP_LSAP && 2540 llc2->llc_ssap == LLC_SNAP_LSAP && 2541 llc2->llc_control == LLC_UI) { 2542 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2543 snap = 1; 2544 } 2545 } 2546 2547 /* 2548 * If we're trying to filter bridge traffic, don't look at anything 2549 * other than IP and ARP traffic. If the filter doesn't understand 2550 * IPv6, don't allow IPv6 through the bridge either. This is lame 2551 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2552 * but of course we don't have an AppleTalk filter to begin with. 2553 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2554 * ARP traffic.) 2555 */ 2556 switch (ether_type) { 2557 case ETHERTYPE_ARP: 2558 case ETHERTYPE_REVARP: 2559 return 0; /* Automatically pass */ 2560 case ETHERTYPE_IP: 2561 # ifdef INET6 2562 case ETHERTYPE_IPV6: 2563 # endif /* INET6 */ 2564 break; 2565 default: 2566 goto bad; 2567 } 2568 2569 /* Strip off the Ethernet header and keep a copy. */ 2570 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2571 m_adj(*mp, ETHER_HDR_LEN); 2572 2573 /* Strip off snap header, if present */ 2574 if (snap) { 2575 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2576 m_adj(*mp, sizeof(struct llc)); 2577 } 2578 2579 /* 2580 * Check basic packet sanity and run IPF through pfil. 2581 */ 2582 KASSERT(!cpu_intr_p()); 2583 switch (ether_type) 2584 { 2585 case ETHERTYPE_IP : 2586 error = bridge_ip_checkbasic(mp); 2587 if (error == 0) 2588 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2589 break; 2590 # ifdef INET6 2591 case ETHERTYPE_IPV6 : 2592 error = bridge_ip6_checkbasic(mp); 2593 if (error == 0) 2594 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2595 break; 2596 # endif 2597 default : 2598 error = 0; 2599 break; 2600 } 2601 2602 if (*mp == NULL) 2603 return error; 2604 if (error != 0) 2605 goto bad; 2606 2607 error = -1; 2608 2609 /* 2610 * Finally, put everything back the way it was and return 2611 */ 2612 if (snap) { 2613 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2614 if (*mp == NULL) 2615 return error; 2616 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2617 } 2618 2619 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2620 if (*mp == NULL) 2621 return error; 2622 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2623 2624 return 0; 2625 2626 bad: 2627 m_freem(*mp); 2628 *mp = NULL; 2629 return error; 2630 } 2631 2632 /* 2633 * Perform basic checks on header size since 2634 * IPF assumes ip_input has already processed 2635 * it for it. Cut-and-pasted from ip_input.c. 2636 * Given how simple the IPv6 version is, 2637 * does the IPv4 version really need to be 2638 * this complicated? 2639 * 2640 * XXX Should we update ipstat here, or not? 2641 * XXX Right now we update ipstat but not 2642 * XXX csum_counter. 2643 */ 2644 static int 2645 bridge_ip_checkbasic(struct mbuf **mp) 2646 { 2647 struct mbuf *m = *mp; 2648 struct ip *ip; 2649 int len, hlen; 2650 2651 if (*mp == NULL) 2652 return -1; 2653 2654 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2655 if ((m = m_copyup(m, sizeof(struct ip), 2656 (max_linkhdr + 3) & ~3)) == NULL) { 2657 /* XXXJRT new stat, please */ 2658 ip_statinc(IP_STAT_TOOSMALL); 2659 goto bad; 2660 } 2661 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2662 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2663 ip_statinc(IP_STAT_TOOSMALL); 2664 goto bad; 2665 } 2666 } 2667 ip = mtod(m, struct ip *); 2668 if (ip == NULL) goto bad; 2669 2670 if (ip->ip_v != IPVERSION) { 2671 ip_statinc(IP_STAT_BADVERS); 2672 goto bad; 2673 } 2674 hlen = ip->ip_hl << 2; 2675 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2676 ip_statinc(IP_STAT_BADHLEN); 2677 goto bad; 2678 } 2679 if (hlen > m->m_len) { 2680 if ((m = m_pullup(m, hlen)) == 0) { 2681 ip_statinc(IP_STAT_BADHLEN); 2682 goto bad; 2683 } 2684 ip = mtod(m, struct ip *); 2685 if (ip == NULL) goto bad; 2686 } 2687 2688 switch (m->m_pkthdr.csum_flags & 2689 ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_IPv4) | 2690 M_CSUM_IPv4_BAD)) { 2691 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2692 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2693 goto bad; 2694 2695 case M_CSUM_IPv4: 2696 /* Checksum was okay. */ 2697 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2698 break; 2699 2700 default: 2701 /* Must compute it ourselves. */ 2702 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2703 if (in_cksum(m, hlen) != 0) 2704 goto bad; 2705 break; 2706 } 2707 2708 /* Retrieve the packet length. */ 2709 len = ntohs(ip->ip_len); 2710 2711 /* 2712 * Check for additional length bogosity 2713 */ 2714 if (len < hlen) { 2715 ip_statinc(IP_STAT_BADLEN); 2716 goto bad; 2717 } 2718 2719 /* 2720 * Check that the amount of data in the buffers 2721 * is as at least much as the IP header would have us expect. 2722 * Drop packet if shorter than we expect. 2723 */ 2724 if (m->m_pkthdr.len < len) { 2725 ip_statinc(IP_STAT_TOOSHORT); 2726 goto bad; 2727 } 2728 2729 /* Checks out, proceed */ 2730 *mp = m; 2731 return 0; 2732 2733 bad: 2734 *mp = m; 2735 return -1; 2736 } 2737 2738 # ifdef INET6 2739 /* 2740 * Same as above, but for IPv6. 2741 * Cut-and-pasted from ip6_input.c. 2742 * XXX Should we update ip6stat, or not? 2743 */ 2744 static int 2745 bridge_ip6_checkbasic(struct mbuf **mp) 2746 { 2747 struct mbuf *m = *mp; 2748 struct ip6_hdr *ip6; 2749 2750 /* 2751 * If the IPv6 header is not aligned, slurp it up into a new 2752 * mbuf with space for link headers, in the event we forward 2753 * it. Otherwise, if it is aligned, make sure the entire base 2754 * IPv6 header is in the first mbuf of the chain. 2755 */ 2756 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2757 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2758 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2759 (max_linkhdr + 3) & ~3)) == NULL) { 2760 /* XXXJRT new stat, please */ 2761 ip6_statinc(IP6_STAT_TOOSMALL); 2762 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2763 goto bad; 2764 } 2765 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2766 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2767 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2768 ip6_statinc(IP6_STAT_TOOSMALL); 2769 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2770 goto bad; 2771 } 2772 } 2773 2774 ip6 = mtod(m, struct ip6_hdr *); 2775 2776 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2777 ip6_statinc(IP6_STAT_BADVERS); 2778 in6_ifstat_inc(m_get_rcvif_NOMPSAFE(m), ifs6_in_hdrerr); 2779 goto bad; 2780 } 2781 2782 /* Checks out, proceed */ 2783 *mp = m; 2784 return 0; 2785 2786 bad: 2787 *mp = m; 2788 return -1; 2789 } 2790 # endif /* INET6 */ 2791 #endif /* BRIDGE_IPF */ 2792
Indexes created Thu Oct 02 14:10:14 GMT 2025