1 /* $NetBSD: if_bridge.c,v 1.149 2018/04/10 07:05:39 ozaki-r 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@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 1.149 2018/04/10 07:05:39 ozaki-r 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) if ((_sc)->sc_rtlist_lock) \ 185 mutex_enter((_sc)->sc_rtlist_lock) 186 #define BRIDGE_RT_UNLOCK(_sc) if ((_sc)->sc_rtlist_lock) \ 187 mutex_exit((_sc)->sc_rtlist_lock) 188 #define BRIDGE_RT_LOCKED(_sc) (!(_sc)->sc_rtlist_lock || \ 189 mutex_owned((_sc)->sc_rtlist_lock)) 190 191 #define BRIDGE_RT_PSZ_PERFORM(_sc) \ 192 if ((_sc)->sc_rtlist_psz != NULL) \ 193 pserialize_perform((_sc)->sc_rtlist_psz); 194 195 #define BRIDGE_RT_RENTER(__s) do { __s = pserialize_read_enter(); } while (0) 196 #define BRIDGE_RT_REXIT(__s) do { pserialize_read_exit(__s); } while (0) 197 198 199 #ifdef NET_MPSAFE 200 #define DECLARE_LOCK_VARIABLE 201 #define ACQUIRE_GLOBAL_LOCKS() do { } while (0) 202 #define RELEASE_GLOBAL_LOCKS() do { } while (0) 203 #else 204 #define DECLARE_LOCK_VARIABLE int __s 205 #define ACQUIRE_GLOBAL_LOCKS() do { \ 206 KERNEL_LOCK(1, NULL); \ 207 mutex_enter(softnet_lock); \ 208 __s = splsoftnet(); \ 209 } while (0) 210 #define RELEASE_GLOBAL_LOCKS() do { \ 211 splx(__s); \ 212 mutex_exit(softnet_lock); \ 213 KERNEL_UNLOCK_ONE(NULL); \ 214 } while (0) 215 #endif 216 217 struct psref_class *bridge_psref_class __read_mostly; 218 219 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 220 221 static struct pool bridge_rtnode_pool; 222 223 static int bridge_clone_create(struct if_clone *, int); 224 static int bridge_clone_destroy(struct ifnet *); 225 226 static int bridge_ioctl(struct ifnet *, u_long, void *); 227 static int bridge_init(struct ifnet *); 228 static void bridge_stop(struct ifnet *, int); 229 static void bridge_start(struct ifnet *); 230 231 static void bridge_input(struct ifnet *, struct mbuf *); 232 static void bridge_forward(struct bridge_softc *, struct mbuf *); 233 234 static void bridge_timer(void *); 235 236 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 237 struct mbuf *); 238 239 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 240 struct ifnet *, int, uint8_t); 241 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 242 static void bridge_rttrim(struct bridge_softc *); 243 static void bridge_rtage(struct bridge_softc *); 244 static void bridge_rtage_work(struct work *, void *); 245 static void bridge_rtflush(struct bridge_softc *, int); 246 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 247 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp); 248 249 static void bridge_rtable_init(struct bridge_softc *); 250 static void bridge_rtable_fini(struct bridge_softc *); 251 252 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 253 const uint8_t *); 254 static int bridge_rtnode_insert(struct bridge_softc *, 255 struct bridge_rtnode *); 256 static void bridge_rtnode_remove(struct bridge_softc *, 257 struct bridge_rtnode *); 258 static void bridge_rtnode_destroy(struct bridge_rtnode *); 259 260 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 261 const char *name, 262 struct psref *); 263 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 264 struct ifnet *ifp, 265 struct psref *); 266 static void bridge_release_member(struct bridge_softc *, struct bridge_iflist *, 267 struct psref *); 268 static void bridge_delete_member(struct bridge_softc *, 269 struct bridge_iflist *); 270 static void bridge_acquire_member(struct bridge_softc *sc, 271 struct bridge_iflist *, 272 struct psref *); 273 274 static int bridge_ioctl_add(struct bridge_softc *, void *); 275 static int bridge_ioctl_del(struct bridge_softc *, void *); 276 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 277 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 278 static int bridge_ioctl_scache(struct bridge_softc *, void *); 279 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 280 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 281 static int bridge_ioctl_rts(struct bridge_softc *, void *); 282 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 283 static int bridge_ioctl_sto(struct bridge_softc *, void *); 284 static int bridge_ioctl_gto(struct bridge_softc *, void *); 285 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 286 static int bridge_ioctl_flush(struct bridge_softc *, void *); 287 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 288 static int bridge_ioctl_spri(struct bridge_softc *, void *); 289 static int bridge_ioctl_ght(struct bridge_softc *, void *); 290 static int bridge_ioctl_sht(struct bridge_softc *, void *); 291 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 292 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 293 static int bridge_ioctl_gma(struct bridge_softc *, void *); 294 static int bridge_ioctl_sma(struct bridge_softc *, void *); 295 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 296 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 297 #if defined(BRIDGE_IPF) 298 static int bridge_ioctl_gfilt(struct bridge_softc *, void *); 299 static int bridge_ioctl_sfilt(struct bridge_softc *, void *); 300 static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int); 301 static int bridge_ip_checkbasic(struct mbuf **mp); 302 # ifdef INET6 303 static int bridge_ip6_checkbasic(struct mbuf **mp); 304 # endif /* INET6 */ 305 #endif /* BRIDGE_IPF */ 306 307 struct bridge_control { 308 int (*bc_func)(struct bridge_softc *, void *); 309 int bc_argsize; 310 int bc_flags; 311 }; 312 313 #define BC_F_COPYIN 0x01 /* copy arguments in */ 314 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 315 #define BC_F_SUSER 0x04 /* do super-user check */ 316 #define BC_F_XLATEIN 0x08 /* xlate arguments in */ 317 #define BC_F_XLATEOUT 0x10 /* xlate arguments out */ 318 319 static const struct bridge_control bridge_control_table[] = { 320 [BRDGADD] = {bridge_ioctl_add, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 321 [BRDGDEL] = {bridge_ioctl_del, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 322 323 [BRDGGIFFLGS] = {bridge_ioctl_gifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_COPYOUT}, 324 [BRDGSIFFLGS] = {bridge_ioctl_sifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 325 326 [BRDGSCACHE] = {bridge_ioctl_scache, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 327 [BRDGGCACHE] = {bridge_ioctl_gcache, sizeof(struct ifbrparam), BC_F_COPYOUT}, 328 329 [OBRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_COPYIN|BC_F_COPYOUT}, 330 [OBRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_COPYIN|BC_F_COPYOUT}, 331 332 [BRDGSADDR] = {bridge_ioctl_saddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 333 334 [BRDGSTO] = {bridge_ioctl_sto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 335 [BRDGGTO] = {bridge_ioctl_gto, sizeof(struct ifbrparam), BC_F_COPYOUT}, 336 337 [BRDGDADDR] = {bridge_ioctl_daddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 338 339 [BRDGFLUSH] = {bridge_ioctl_flush, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 340 341 [BRDGGPRI] = {bridge_ioctl_gpri, sizeof(struct ifbrparam), BC_F_COPYOUT}, 342 [BRDGSPRI] = {bridge_ioctl_spri, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 343 344 [BRDGGHT] = {bridge_ioctl_ght, sizeof(struct ifbrparam), BC_F_COPYOUT}, 345 [BRDGSHT] = {bridge_ioctl_sht, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 346 347 [BRDGGFD] = {bridge_ioctl_gfd, sizeof(struct ifbrparam), BC_F_COPYOUT}, 348 [BRDGSFD] = {bridge_ioctl_sfd, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 349 350 [BRDGGMA] = {bridge_ioctl_gma, sizeof(struct ifbrparam), BC_F_COPYOUT}, 351 [BRDGSMA] = {bridge_ioctl_sma, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 352 353 [BRDGSIFPRIO] = {bridge_ioctl_sifprio, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 354 355 [BRDGSIFCOST] = {bridge_ioctl_sifcost, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 356 #if defined(BRIDGE_IPF) 357 [BRDGGFILT] = {bridge_ioctl_gfilt, sizeof(struct ifbrparam), BC_F_COPYOUT}, 358 [BRDGSFILT] = {bridge_ioctl_sfilt, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 359 #endif /* BRIDGE_IPF */ 360 [BRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 361 [BRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 362 }; 363 364 static const int bridge_control_table_size = __arraycount(bridge_control_table); 365 366 static struct if_clone bridge_cloner = 367 IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy); 368 369 /* 370 * bridgeattach: 371 * 372 * Pseudo-device attach routine. 373 */ 374 void 375 bridgeattach(int n) 376 { 377 378 pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode), 379 0, 0, 0, "brtpl", NULL, IPL_NET); 380 381 bridge_psref_class = psref_class_create("bridge", IPL_SOFTNET); 382 383 if_clone_attach(&bridge_cloner); 384 } 385 386 /* 387 * bridge_clone_create: 388 * 389 * Create a new bridge instance. 390 */ 391 static int 392 bridge_clone_create(struct if_clone *ifc, int unit) 393 { 394 struct bridge_softc *sc; 395 struct ifnet *ifp; 396 int error; 397 398 sc = kmem_zalloc(sizeof(*sc), KM_SLEEP); 399 ifp = &sc->sc_if; 400 401 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 402 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 403 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 404 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 405 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 406 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 407 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 408 sc->sc_filter_flags = 0; 409 410 /* Initialize our routing table. */ 411 bridge_rtable_init(sc); 412 413 error = workqueue_create(&sc->sc_rtage_wq, "bridge_rtage", 414 bridge_rtage_work, sc, PRI_SOFTNET, IPL_SOFTNET, WQ_MPSAFE); 415 if (error) 416 panic("%s: workqueue_create %d\n", __func__, error); 417 418 callout_init(&sc->sc_brcallout, CALLOUT_MPSAFE); 419 callout_init(&sc->sc_bstpcallout, CALLOUT_MPSAFE); 420 421 mutex_init(&sc->sc_iflist_psref.bip_lock, MUTEX_DEFAULT, IPL_NONE); 422 PSLIST_INIT(&sc->sc_iflist_psref.bip_iflist); 423 sc->sc_iflist_psref.bip_psz = pserialize_create(); 424 425 if_initname(ifp, ifc->ifc_name, unit); 426 ifp->if_softc = sc; 427 ifp->if_extflags = IFEF_NO_LINK_STATE_CHANGE; 428 #ifdef NET_MPSAFE 429 ifp->if_extflags |= IFEF_MPSAFE; 430 #endif 431 ifp->if_mtu = ETHERMTU; 432 ifp->if_ioctl = bridge_ioctl; 433 ifp->if_output = bridge_output; 434 ifp->if_start = bridge_start; 435 ifp->if_stop = bridge_stop; 436 ifp->if_init = bridge_init; 437 ifp->if_type = IFT_BRIDGE; 438 ifp->if_addrlen = 0; 439 ifp->if_dlt = DLT_EN10MB; 440 ifp->if_hdrlen = ETHER_HDR_LEN; 441 442 error = if_initialize(ifp); 443 if (error != 0) { 444 pserialize_destroy(sc->sc_iflist_psref.bip_psz); 445 mutex_destroy(&sc->sc_iflist_psref.bip_lock); 446 callout_destroy(&sc->sc_brcallout); 447 callout_destroy(&sc->sc_bstpcallout); 448 workqueue_destroy(sc->sc_rtage_wq); 449 bridge_rtable_fini(sc); 450 kmem_free(sc, sizeof(*sc)); 451 452 return error; 453 } 454 if_register(ifp); 455 456 if_alloc_sadl(ifp); 457 458 return 0; 459 } 460 461 /* 462 * bridge_clone_destroy: 463 * 464 * Destroy a bridge instance. 465 */ 466 static int 467 bridge_clone_destroy(struct ifnet *ifp) 468 { 469 struct bridge_softc *sc = ifp->if_softc; 470 struct bridge_iflist *bif; 471 472 if ((ifp->if_flags & IFF_RUNNING) != 0) 473 bridge_stop(ifp, 1); 474 475 BRIDGE_LOCK(sc); 476 for (;;) { 477 bif = PSLIST_WRITER_FIRST(&sc->sc_iflist_psref.bip_iflist, struct bridge_iflist, 478 bif_next); 479 if (bif == NULL) 480 break; 481 bridge_delete_member(sc, bif); 482 } 483 PSLIST_DESTROY(&sc->sc_iflist_psref.bip_iflist); 484 BRIDGE_UNLOCK(sc); 485 486 if_detach(ifp); 487 488 /* Tear down the routing table. */ 489 bridge_rtable_fini(sc); 490 491 pserialize_destroy(sc->sc_iflist_psref.bip_psz); 492 mutex_destroy(&sc->sc_iflist_psref.bip_lock); 493 callout_destroy(&sc->sc_brcallout); 494 callout_destroy(&sc->sc_bstpcallout); 495 workqueue_destroy(sc->sc_rtage_wq); 496 kmem_free(sc, sizeof(*sc)); 497 498 return 0; 499 } 500 501 /* 502 * bridge_ioctl: 503 * 504 * Handle a control request from the operator. 505 */ 506 static int 507 bridge_ioctl(struct ifnet *ifp, u_long cmd, void *data) 508 { 509 struct bridge_softc *sc = ifp->if_softc; 510 struct lwp *l = curlwp; /* XXX */ 511 union { 512 struct ifbreq ifbreq; 513 struct ifbifconf ifbifconf; 514 struct ifbareq ifbareq; 515 struct ifbaconf ifbaconf; 516 struct ifbrparam ifbrparam; 517 } args; 518 struct ifdrv *ifd = (struct ifdrv *) data; 519 const struct bridge_control *bc = NULL; /* XXXGCC */ 520 int s, error = 0; 521 522 /* Authorize command before calling splsoftnet(). */ 523 switch (cmd) { 524 case SIOCGDRVSPEC: 525 case SIOCSDRVSPEC: 526 if (ifd->ifd_cmd >= bridge_control_table_size 527 || (bc = &bridge_control_table[ifd->ifd_cmd]) == NULL) { 528 error = EINVAL; 529 return error; 530 } 531 532 /* We only care about BC_F_SUSER at this point. */ 533 if ((bc->bc_flags & BC_F_SUSER) == 0) 534 break; 535 536 error = kauth_authorize_network(l->l_cred, 537 KAUTH_NETWORK_INTERFACE_BRIDGE, 538 cmd == SIOCGDRVSPEC ? 539 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_GETPRIV : 540 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_SETPRIV, 541 ifd, NULL, NULL); 542 if (error) 543 return error; 544 545 break; 546 } 547 548 s = splsoftnet(); 549 550 switch (cmd) { 551 case SIOCGDRVSPEC: 552 case SIOCSDRVSPEC: 553 KASSERT(bc != NULL); 554 if (cmd == SIOCGDRVSPEC && 555 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) == 0) { 556 error = EINVAL; 557 break; 558 } 559 else if (cmd == SIOCSDRVSPEC && 560 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) != 0) { 561 error = EINVAL; 562 break; 563 } 564 565 /* BC_F_SUSER is checked above, before splsoftnet(). */ 566 567 if ((bc->bc_flags & (BC_F_XLATEIN|BC_F_XLATEOUT)) == 0 568 && (ifd->ifd_len != bc->bc_argsize 569 || ifd->ifd_len > sizeof(args))) { 570 error = EINVAL; 571 break; 572 } 573 574 memset(&args, 0, sizeof(args)); 575 if (bc->bc_flags & BC_F_COPYIN) { 576 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 577 if (error) 578 break; 579 } else if (bc->bc_flags & BC_F_XLATEIN) { 580 args.ifbifconf.ifbic_len = ifd->ifd_len; 581 args.ifbifconf.ifbic_buf = ifd->ifd_data; 582 } 583 584 error = (*bc->bc_func)(sc, &args); 585 if (error) 586 break; 587 588 if (bc->bc_flags & BC_F_COPYOUT) { 589 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 590 } else if (bc->bc_flags & BC_F_XLATEOUT) { 591 ifd->ifd_len = args.ifbifconf.ifbic_len; 592 ifd->ifd_data = args.ifbifconf.ifbic_buf; 593 } 594 break; 595 596 case SIOCSIFFLAGS: 597 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 598 break; 599 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 600 case IFF_RUNNING: 601 /* 602 * If interface is marked down and it is running, 603 * then stop and disable it. 604 */ 605 (*ifp->if_stop)(ifp, 1); 606 break; 607 case IFF_UP: 608 /* 609 * If interface is marked up and it is stopped, then 610 * start it. 611 */ 612 error = (*ifp->if_init)(ifp); 613 break; 614 default: 615 break; 616 } 617 break; 618 619 case SIOCSIFMTU: 620 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 621 error = 0; 622 break; 623 624 default: 625 error = ifioctl_common(ifp, cmd, data); 626 break; 627 } 628 629 splx(s); 630 631 return error; 632 } 633 634 /* 635 * bridge_lookup_member: 636 * 637 * Lookup a bridge member interface. 638 */ 639 static struct bridge_iflist * 640 bridge_lookup_member(struct bridge_softc *sc, const char *name, struct psref *psref) 641 { 642 struct bridge_iflist *bif; 643 struct ifnet *ifp; 644 int s; 645 646 BRIDGE_PSZ_RENTER(s); 647 648 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 649 ifp = bif->bif_ifp; 650 if (strcmp(ifp->if_xname, name) == 0) 651 break; 652 } 653 if (bif != NULL) 654 bridge_acquire_member(sc, bif, psref); 655 656 BRIDGE_PSZ_REXIT(s); 657 658 return bif; 659 } 660 661 /* 662 * bridge_lookup_member_if: 663 * 664 * Lookup a bridge member interface by ifnet*. 665 */ 666 static struct bridge_iflist * 667 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp, 668 struct psref *psref) 669 { 670 struct bridge_iflist *bif; 671 int s; 672 673 BRIDGE_PSZ_RENTER(s); 674 675 bif = member_ifp->if_bridgeif; 676 if (bif != NULL) { 677 psref_acquire(psref, &bif->bif_psref, 678 bridge_psref_class); 679 } 680 681 BRIDGE_PSZ_REXIT(s); 682 683 return bif; 684 } 685 686 static void 687 bridge_acquire_member(struct bridge_softc *sc, struct bridge_iflist *bif, 688 struct psref *psref) 689 { 690 691 psref_acquire(psref, &bif->bif_psref, bridge_psref_class); 692 } 693 694 /* 695 * bridge_release_member: 696 * 697 * Release the specified member interface. 698 */ 699 static void 700 bridge_release_member(struct bridge_softc *sc, struct bridge_iflist *bif, 701 struct psref *psref) 702 { 703 704 psref_release(psref, &bif->bif_psref, bridge_psref_class); 705 } 706 707 /* 708 * bridge_delete_member: 709 * 710 * Delete the specified member interface. 711 */ 712 static void 713 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 714 { 715 struct ifnet *ifs = bif->bif_ifp; 716 717 KASSERT(BRIDGE_LOCKED(sc)); 718 719 ifs->_if_input = ether_input; 720 ifs->if_bridge = NULL; 721 ifs->if_bridgeif = NULL; 722 723 PSLIST_WRITER_REMOVE(bif, bif_next); 724 BRIDGE_PSZ_PERFORM(sc); 725 BRIDGE_UNLOCK(sc); 726 727 psref_target_destroy(&bif->bif_psref, bridge_psref_class); 728 729 PSLIST_ENTRY_DESTROY(bif, bif_next); 730 kmem_free(bif, sizeof(*bif)); 731 732 BRIDGE_LOCK(sc); 733 } 734 735 static int 736 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 737 { 738 struct ifbreq *req = arg; 739 struct bridge_iflist *bif = NULL; 740 struct ifnet *ifs; 741 int error = 0; 742 struct psref psref; 743 744 ifs = if_get(req->ifbr_ifsname, &psref); 745 if (ifs == NULL) 746 return ENOENT; 747 748 if (ifs->if_bridge == sc) { 749 error = EEXIST; 750 goto out; 751 } 752 753 if (ifs->if_bridge != NULL) { 754 error = EBUSY; 755 goto out; 756 } 757 758 if (ifs->_if_input != ether_input) { 759 error = EINVAL; 760 goto out; 761 } 762 763 /* FIXME: doesn't work with non-IFF_SIMPLEX interfaces */ 764 if ((ifs->if_flags & IFF_SIMPLEX) == 0) { 765 error = EINVAL; 766 goto out; 767 } 768 769 bif = kmem_alloc(sizeof(*bif), KM_SLEEP); 770 771 switch (ifs->if_type) { 772 case IFT_ETHER: 773 if (sc->sc_if.if_mtu != ifs->if_mtu) { 774 error = EINVAL; 775 goto out; 776 } 777 /* FALLTHROUGH */ 778 case IFT_L2TP: 779 IFNET_LOCK(ifs); 780 error = ether_enable_vlan_mtu(ifs); 781 IFNET_UNLOCK(ifs); 782 if (error > 0) 783 goto out; 784 /* 785 * Place the interface into promiscuous mode. 786 */ 787 error = ifpromisc(ifs, 1); 788 if (error) 789 goto out; 790 break; 791 default: 792 error = EINVAL; 793 goto out; 794 } 795 796 bif->bif_ifp = ifs; 797 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 798 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 799 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 800 PSLIST_ENTRY_INIT(bif, bif_next); 801 psref_target_init(&bif->bif_psref, bridge_psref_class); 802 803 BRIDGE_LOCK(sc); 804 805 ifs->if_bridge = sc; 806 ifs->if_bridgeif = bif; 807 PSLIST_WRITER_INSERT_HEAD(&sc->sc_iflist_psref.bip_iflist, bif, bif_next); 808 ifs->_if_input = bridge_input; 809 810 BRIDGE_UNLOCK(sc); 811 812 if (sc->sc_if.if_flags & IFF_RUNNING) 813 bstp_initialization(sc); 814 else 815 bstp_stop(sc); 816 817 out: 818 if_put(ifs, &psref); 819 if (error) { 820 if (bif != NULL) 821 kmem_free(bif, sizeof(*bif)); 822 } 823 return error; 824 } 825 826 static int 827 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 828 { 829 struct ifbreq *req = arg; 830 const char *name = req->ifbr_ifsname; 831 struct bridge_iflist *bif; 832 struct ifnet *ifs; 833 834 BRIDGE_LOCK(sc); 835 836 /* 837 * Don't use bridge_lookup_member. We want to get a member 838 * with bif_refs == 0. 839 */ 840 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 841 ifs = bif->bif_ifp; 842 if (strcmp(ifs->if_xname, name) == 0) 843 break; 844 } 845 846 if (bif == NULL) { 847 BRIDGE_UNLOCK(sc); 848 return ENOENT; 849 } 850 851 bridge_delete_member(sc, bif); 852 853 BRIDGE_UNLOCK(sc); 854 855 switch (ifs->if_type) { 856 case IFT_ETHER: 857 case IFT_L2TP: 858 /* 859 * Take the interface out of promiscuous mode. 860 * Don't call it with holding a spin lock. 861 */ 862 (void) ifpromisc(ifs, 0); 863 IFNET_LOCK(ifs); 864 (void) ether_disable_vlan_mtu(ifs); 865 IFNET_UNLOCK(ifs); 866 break; 867 default: 868 #ifdef DIAGNOSTIC 869 panic("bridge_delete_member: impossible"); 870 #endif 871 break; 872 } 873 874 bridge_rtdelete(sc, ifs); 875 876 if (sc->sc_if.if_flags & IFF_RUNNING) 877 bstp_initialization(sc); 878 879 return 0; 880 } 881 882 static int 883 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 884 { 885 struct ifbreq *req = arg; 886 struct bridge_iflist *bif; 887 struct psref psref; 888 889 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 890 if (bif == NULL) 891 return ENOENT; 892 893 req->ifbr_ifsflags = bif->bif_flags; 894 req->ifbr_state = bif->bif_state; 895 req->ifbr_priority = bif->bif_priority; 896 req->ifbr_path_cost = bif->bif_path_cost; 897 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 898 899 bridge_release_member(sc, bif, &psref); 900 901 return 0; 902 } 903 904 static int 905 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 906 { 907 struct ifbreq *req = arg; 908 struct bridge_iflist *bif; 909 struct psref psref; 910 911 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 912 if (bif == NULL) 913 return ENOENT; 914 915 if (req->ifbr_ifsflags & IFBIF_STP) { 916 switch (bif->bif_ifp->if_type) { 917 case IFT_ETHER: 918 case IFT_L2TP: 919 /* These can do spanning tree. */ 920 break; 921 922 default: 923 /* Nothing else can. */ 924 bridge_release_member(sc, bif, &psref); 925 return EINVAL; 926 } 927 } 928 929 bif->bif_flags = req->ifbr_ifsflags; 930 931 bridge_release_member(sc, bif, &psref); 932 933 if (sc->sc_if.if_flags & IFF_RUNNING) 934 bstp_initialization(sc); 935 936 return 0; 937 } 938 939 static int 940 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 941 { 942 struct ifbrparam *param = arg; 943 944 sc->sc_brtmax = param->ifbrp_csize; 945 bridge_rttrim(sc); 946 947 return 0; 948 } 949 950 static int 951 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 952 { 953 struct ifbrparam *param = arg; 954 955 param->ifbrp_csize = sc->sc_brtmax; 956 957 return 0; 958 } 959 960 static int 961 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 962 { 963 struct ifbifconf *bifc = arg; 964 struct bridge_iflist *bif; 965 struct ifbreq *breqs; 966 int i, count, error = 0; 967 968 retry: 969 BRIDGE_LOCK(sc); 970 count = 0; 971 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 972 count++; 973 BRIDGE_UNLOCK(sc); 974 975 if (count == 0) { 976 bifc->ifbic_len = 0; 977 return 0; 978 } 979 980 if (bifc->ifbic_len == 0 || bifc->ifbic_len < (sizeof(*breqs) * count)) { 981 /* Tell that a larger buffer is needed */ 982 bifc->ifbic_len = sizeof(*breqs) * count; 983 return 0; 984 } 985 986 breqs = kmem_alloc(sizeof(*breqs) * count, KM_SLEEP); 987 988 BRIDGE_LOCK(sc); 989 990 i = 0; 991 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 992 i++; 993 if (i > count) { 994 /* 995 * The number of members has been increased. 996 * We need more memory! 997 */ 998 BRIDGE_UNLOCK(sc); 999 kmem_free(breqs, sizeof(*breqs) * count); 1000 goto retry; 1001 } 1002 1003 i = 0; 1004 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 1005 struct ifbreq *breq = &breqs[i++]; 1006 memset(breq, 0, sizeof(*breq)); 1007 1008 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, 1009 sizeof(breq->ifbr_ifsname)); 1010 breq->ifbr_ifsflags = bif->bif_flags; 1011 breq->ifbr_state = bif->bif_state; 1012 breq->ifbr_priority = bif->bif_priority; 1013 breq->ifbr_path_cost = bif->bif_path_cost; 1014 breq->ifbr_portno = bif->bif_ifp->if_index & 0xff; 1015 } 1016 1017 /* Don't call copyout with holding the mutex */ 1018 BRIDGE_UNLOCK(sc); 1019 1020 for (i = 0; i < count; i++) { 1021 error = copyout(&breqs[i], bifc->ifbic_req + i, sizeof(*breqs)); 1022 if (error) 1023 break; 1024 } 1025 bifc->ifbic_len = sizeof(*breqs) * i; 1026 1027 kmem_free(breqs, sizeof(*breqs) * count); 1028 1029 return error; 1030 } 1031 1032 static int 1033 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1034 { 1035 struct ifbaconf *bac = arg; 1036 struct bridge_rtnode *brt; 1037 struct ifbareq bareq; 1038 int count = 0, error = 0, len; 1039 1040 if (bac->ifbac_len == 0) 1041 return 0; 1042 1043 BRIDGE_RT_LOCK(sc); 1044 1045 len = bac->ifbac_len; 1046 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1047 if (len < sizeof(bareq)) 1048 goto out; 1049 memset(&bareq, 0, sizeof(bareq)); 1050 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1051 sizeof(bareq.ifba_ifsname)); 1052 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1053 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1054 bareq.ifba_expire = brt->brt_expire - time_uptime; 1055 } else 1056 bareq.ifba_expire = 0; 1057 bareq.ifba_flags = brt->brt_flags; 1058 1059 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1060 if (error) 1061 goto out; 1062 count++; 1063 len -= sizeof(bareq); 1064 } 1065 out: 1066 BRIDGE_RT_UNLOCK(sc); 1067 1068 bac->ifbac_len = sizeof(bareq) * count; 1069 return error; 1070 } 1071 1072 static int 1073 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1074 { 1075 struct ifbareq *req = arg; 1076 struct bridge_iflist *bif; 1077 int error; 1078 struct psref psref; 1079 1080 bif = bridge_lookup_member(sc, req->ifba_ifsname, &psref); 1081 if (bif == NULL) 1082 return ENOENT; 1083 1084 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1085 req->ifba_flags); 1086 1087 bridge_release_member(sc, bif, &psref); 1088 1089 return error; 1090 } 1091 1092 static int 1093 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1094 { 1095 struct ifbrparam *param = arg; 1096 1097 sc->sc_brttimeout = param->ifbrp_ctime; 1098 1099 return 0; 1100 } 1101 1102 static int 1103 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1104 { 1105 struct ifbrparam *param = arg; 1106 1107 param->ifbrp_ctime = sc->sc_brttimeout; 1108 1109 return 0; 1110 } 1111 1112 static int 1113 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1114 { 1115 struct ifbareq *req = arg; 1116 1117 return (bridge_rtdaddr(sc, req->ifba_dst)); 1118 } 1119 1120 static int 1121 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1122 { 1123 struct ifbreq *req = arg; 1124 1125 bridge_rtflush(sc, req->ifbr_ifsflags); 1126 1127 return 0; 1128 } 1129 1130 static int 1131 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1132 { 1133 struct ifbrparam *param = arg; 1134 1135 param->ifbrp_prio = sc->sc_bridge_priority; 1136 1137 return 0; 1138 } 1139 1140 static int 1141 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1142 { 1143 struct ifbrparam *param = arg; 1144 1145 sc->sc_bridge_priority = param->ifbrp_prio; 1146 1147 if (sc->sc_if.if_flags & IFF_RUNNING) 1148 bstp_initialization(sc); 1149 1150 return 0; 1151 } 1152 1153 static int 1154 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1155 { 1156 struct ifbrparam *param = arg; 1157 1158 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1159 1160 return 0; 1161 } 1162 1163 static int 1164 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1165 { 1166 struct ifbrparam *param = arg; 1167 1168 if (param->ifbrp_hellotime == 0) 1169 return EINVAL; 1170 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1171 1172 if (sc->sc_if.if_flags & IFF_RUNNING) 1173 bstp_initialization(sc); 1174 1175 return 0; 1176 } 1177 1178 static int 1179 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1180 { 1181 struct ifbrparam *param = arg; 1182 1183 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1184 1185 return 0; 1186 } 1187 1188 static int 1189 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1190 { 1191 struct ifbrparam *param = arg; 1192 1193 if (param->ifbrp_fwddelay == 0) 1194 return EINVAL; 1195 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1196 1197 if (sc->sc_if.if_flags & IFF_RUNNING) 1198 bstp_initialization(sc); 1199 1200 return 0; 1201 } 1202 1203 static int 1204 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1205 { 1206 struct ifbrparam *param = arg; 1207 1208 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1209 1210 return 0; 1211 } 1212 1213 static int 1214 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1215 { 1216 struct ifbrparam *param = arg; 1217 1218 if (param->ifbrp_maxage == 0) 1219 return EINVAL; 1220 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1221 1222 if (sc->sc_if.if_flags & IFF_RUNNING) 1223 bstp_initialization(sc); 1224 1225 return 0; 1226 } 1227 1228 static int 1229 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1230 { 1231 struct ifbreq *req = arg; 1232 struct bridge_iflist *bif; 1233 struct psref psref; 1234 1235 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1236 if (bif == NULL) 1237 return ENOENT; 1238 1239 bif->bif_priority = req->ifbr_priority; 1240 1241 if (sc->sc_if.if_flags & IFF_RUNNING) 1242 bstp_initialization(sc); 1243 1244 bridge_release_member(sc, bif, &psref); 1245 1246 return 0; 1247 } 1248 1249 #if defined(BRIDGE_IPF) 1250 static int 1251 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1252 { 1253 struct ifbrparam *param = arg; 1254 1255 param->ifbrp_filter = sc->sc_filter_flags; 1256 1257 return 0; 1258 } 1259 1260 static int 1261 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1262 { 1263 struct ifbrparam *param = arg; 1264 uint32_t nflags, oflags; 1265 1266 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1267 return EINVAL; 1268 1269 nflags = param->ifbrp_filter; 1270 oflags = sc->sc_filter_flags; 1271 1272 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1273 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1274 sc->sc_if.if_pfil); 1275 } 1276 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1277 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1278 sc->sc_if.if_pfil); 1279 } 1280 1281 sc->sc_filter_flags = nflags; 1282 1283 return 0; 1284 } 1285 #endif /* BRIDGE_IPF */ 1286 1287 static int 1288 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1289 { 1290 struct ifbreq *req = arg; 1291 struct bridge_iflist *bif; 1292 struct psref psref; 1293 1294 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1295 if (bif == NULL) 1296 return ENOENT; 1297 1298 bif->bif_path_cost = req->ifbr_path_cost; 1299 1300 if (sc->sc_if.if_flags & IFF_RUNNING) 1301 bstp_initialization(sc); 1302 1303 bridge_release_member(sc, bif, &psref); 1304 1305 return 0; 1306 } 1307 1308 /* 1309 * bridge_ifdetach: 1310 * 1311 * Detach an interface from a bridge. Called when a member 1312 * interface is detaching. 1313 */ 1314 void 1315 bridge_ifdetach(struct ifnet *ifp) 1316 { 1317 struct bridge_softc *sc = ifp->if_bridge; 1318 struct ifbreq breq; 1319 1320 /* ioctl_lock should prevent this from happening */ 1321 KASSERT(sc != NULL); 1322 1323 memset(&breq, 0, sizeof(breq)); 1324 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1325 1326 (void) bridge_ioctl_del(sc, &breq); 1327 } 1328 1329 /* 1330 * bridge_init: 1331 * 1332 * Initialize a bridge interface. 1333 */ 1334 static int 1335 bridge_init(struct ifnet *ifp) 1336 { 1337 struct bridge_softc *sc = ifp->if_softc; 1338 1339 KASSERT((ifp->if_flags & IFF_RUNNING) == 0); 1340 1341 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1342 bridge_timer, sc); 1343 bstp_initialization(sc); 1344 1345 ifp->if_flags |= IFF_RUNNING; 1346 return 0; 1347 } 1348 1349 /* 1350 * bridge_stop: 1351 * 1352 * Stop the bridge interface. 1353 */ 1354 static void 1355 bridge_stop(struct ifnet *ifp, int disable) 1356 { 1357 struct bridge_softc *sc = ifp->if_softc; 1358 1359 KASSERT((ifp->if_flags & IFF_RUNNING) != 0); 1360 ifp->if_flags &= ~IFF_RUNNING; 1361 1362 callout_halt(&sc->sc_brcallout, NULL); 1363 workqueue_wait(sc->sc_rtage_wq, &sc->sc_rtage_wk); 1364 bstp_stop(sc); 1365 bridge_rtflush(sc, IFBF_FLUSHDYN); 1366 } 1367 1368 /* 1369 * bridge_enqueue: 1370 * 1371 * Enqueue a packet on a bridge member interface. 1372 */ 1373 void 1374 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1375 int runfilt) 1376 { 1377 int len, error; 1378 short mflags; 1379 1380 /* 1381 * Clear any in-bound checksum flags for this packet. 1382 */ 1383 m->m_pkthdr.csum_flags = 0; 1384 1385 if (runfilt) { 1386 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1387 dst_ifp, PFIL_OUT) != 0) { 1388 if (m != NULL) 1389 m_freem(m); 1390 return; 1391 } 1392 if (m == NULL) 1393 return; 1394 } 1395 1396 #ifdef ALTQ 1397 KERNEL_LOCK(1, NULL); 1398 /* 1399 * If ALTQ is enabled on the member interface, do 1400 * classification; the queueing discipline might 1401 * not require classification, but might require 1402 * the address family/header pointer in the pktattr. 1403 */ 1404 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1405 /* XXX IFT_ETHER */ 1406 altq_etherclassify(&dst_ifp->if_snd, m); 1407 } 1408 KERNEL_UNLOCK_ONE(NULL); 1409 #endif /* ALTQ */ 1410 1411 len = m->m_pkthdr.len; 1412 mflags = m->m_flags; 1413 1414 error = if_transmit_lock(dst_ifp, m); 1415 if (error) { 1416 /* mbuf is already freed */ 1417 sc->sc_if.if_oerrors++; 1418 return; 1419 } 1420 1421 sc->sc_if.if_opackets++; 1422 sc->sc_if.if_obytes += len; 1423 if (mflags & M_MCAST) 1424 sc->sc_if.if_omcasts++; 1425 } 1426 1427 /* 1428 * bridge_output: 1429 * 1430 * Send output from a bridge member interface. This 1431 * performs the bridging function for locally originated 1432 * packets. 1433 * 1434 * The mbuf has the Ethernet header already attached. We must 1435 * enqueue or free the mbuf before returning. 1436 */ 1437 int 1438 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1439 const struct rtentry *rt) 1440 { 1441 struct ether_header *eh; 1442 struct ifnet *dst_if; 1443 struct bridge_softc *sc; 1444 int s; 1445 1446 /* 1447 * bridge_output() is called from ether_output(), furthermore 1448 * ifp argument doesn't point to bridge(4). So, don't assert 1449 * IFEF_MPSAFE here. 1450 */ 1451 1452 if (m->m_len < ETHER_HDR_LEN) { 1453 m = m_pullup(m, ETHER_HDR_LEN); 1454 if (m == NULL) 1455 return 0; 1456 } 1457 1458 eh = mtod(m, struct ether_header *); 1459 sc = ifp->if_bridge; 1460 1461 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1462 if (memcmp(etherbroadcastaddr, 1463 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1464 m->m_flags |= M_BCAST; 1465 else 1466 m->m_flags |= M_MCAST; 1467 } 1468 1469 /* 1470 * If bridge is down, but the original output interface is up, 1471 * go ahead and send out that interface. Otherwise, the packet 1472 * is dropped below. 1473 */ 1474 if (__predict_false(sc == NULL) || 1475 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1476 dst_if = ifp; 1477 goto sendunicast; 1478 } 1479 1480 /* 1481 * If the packet is a multicast, or we don't know a better way to 1482 * get there, send to all interfaces. 1483 */ 1484 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0) 1485 dst_if = NULL; 1486 else 1487 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1488 if (dst_if == NULL) { 1489 /* XXX Should call bridge_broadcast, but there are locking 1490 * issues which need resolving first. */ 1491 struct bridge_iflist *bif; 1492 struct mbuf *mc; 1493 bool used = false; 1494 1495 BRIDGE_PSZ_RENTER(s); 1496 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1497 struct psref psref; 1498 1499 bridge_acquire_member(sc, bif, &psref); 1500 BRIDGE_PSZ_REXIT(s); 1501 1502 dst_if = bif->bif_ifp; 1503 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1504 goto next; 1505 1506 /* 1507 * If this is not the original output interface, 1508 * and the interface is participating in spanning 1509 * tree, make sure the port is in a state that 1510 * allows forwarding. 1511 */ 1512 if (dst_if != ifp && 1513 (bif->bif_flags & IFBIF_STP) != 0) { 1514 switch (bif->bif_state) { 1515 case BSTP_IFSTATE_BLOCKING: 1516 case BSTP_IFSTATE_LISTENING: 1517 case BSTP_IFSTATE_DISABLED: 1518 goto next; 1519 } 1520 } 1521 1522 if (PSLIST_READER_NEXT(bif, struct bridge_iflist, 1523 bif_next) == NULL && 1524 ((m->m_flags & (M_MCAST | M_BCAST)) == 0 || 1525 dst_if == ifp)) 1526 { 1527 used = true; 1528 mc = m; 1529 } else { 1530 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1531 if (mc == NULL) { 1532 sc->sc_if.if_oerrors++; 1533 goto next; 1534 } 1535 } 1536 1537 bridge_enqueue(sc, dst_if, mc, 0); 1538 1539 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0 && 1540 dst_if != ifp) 1541 { 1542 if (PSLIST_READER_NEXT(bif, 1543 struct bridge_iflist, bif_next) == NULL) 1544 { 1545 used = true; 1546 mc = m; 1547 } else { 1548 mc = m_copym(m, 0, M_COPYALL, 1549 M_DONTWAIT); 1550 if (mc == NULL) { 1551 sc->sc_if.if_oerrors++; 1552 goto next; 1553 } 1554 } 1555 1556 m_set_rcvif(mc, dst_if); 1557 mc->m_flags &= ~M_PROMISC; 1558 1559 #ifndef NET_MPSAFE 1560 s = splsoftnet(); 1561 #endif 1562 ether_input(dst_if, mc); 1563 #ifndef NET_MPSAFE 1564 splx(s); 1565 #endif 1566 } 1567 1568 next: 1569 BRIDGE_PSZ_RENTER(s); 1570 bridge_release_member(sc, bif, &psref); 1571 1572 /* Guarantee we don't re-enter the loop as we already 1573 * decided we're at the end. */ 1574 if (used) 1575 break; 1576 } 1577 BRIDGE_PSZ_REXIT(s); 1578 1579 if (!used) 1580 m_freem(m); 1581 return 0; 1582 } 1583 1584 sendunicast: 1585 /* 1586 * XXX Spanning tree consideration here? 1587 */ 1588 1589 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1590 m_freem(m); 1591 return 0; 1592 } 1593 1594 bridge_enqueue(sc, dst_if, m, 0); 1595 1596 return 0; 1597 } 1598 1599 /* 1600 * bridge_start: 1601 * 1602 * Start output on a bridge. 1603 * 1604 * NOTE: This routine should never be called in this implementation. 1605 */ 1606 static void 1607 bridge_start(struct ifnet *ifp) 1608 { 1609 1610 printf("%s: bridge_start() called\n", ifp->if_xname); 1611 } 1612 1613 /* 1614 * bridge_forward: 1615 * 1616 * The forwarding function of the bridge. 1617 */ 1618 static void 1619 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1620 { 1621 struct bridge_iflist *bif; 1622 struct ifnet *src_if, *dst_if; 1623 struct ether_header *eh; 1624 struct psref psref; 1625 struct psref psref_src; 1626 DECLARE_LOCK_VARIABLE; 1627 1628 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1629 return; 1630 1631 src_if = m_get_rcvif_psref(m, &psref_src); 1632 if (src_if == NULL) { 1633 /* Interface is being destroyed? */ 1634 m_freem(m); 1635 goto out; 1636 } 1637 1638 sc->sc_if.if_ipackets++; 1639 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1640 1641 /* 1642 * Look up the bridge_iflist. 1643 */ 1644 bif = bridge_lookup_member_if(sc, src_if, &psref); 1645 if (bif == NULL) { 1646 /* Interface is not a bridge member (anymore?) */ 1647 m_freem(m); 1648 goto out; 1649 } 1650 1651 if (bif->bif_flags & IFBIF_STP) { 1652 switch (bif->bif_state) { 1653 case BSTP_IFSTATE_BLOCKING: 1654 case BSTP_IFSTATE_LISTENING: 1655 case BSTP_IFSTATE_DISABLED: 1656 m_freem(m); 1657 bridge_release_member(sc, bif, &psref); 1658 goto out; 1659 } 1660 } 1661 1662 eh = mtod(m, struct ether_header *); 1663 1664 /* 1665 * If the interface is learning, and the source 1666 * address is valid and not multicast, record 1667 * the address. 1668 */ 1669 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1670 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1671 (eh->ether_shost[0] == 0 && 1672 eh->ether_shost[1] == 0 && 1673 eh->ether_shost[2] == 0 && 1674 eh->ether_shost[3] == 0 && 1675 eh->ether_shost[4] == 0 && 1676 eh->ether_shost[5] == 0) == 0) { 1677 (void) bridge_rtupdate(sc, eh->ether_shost, 1678 src_if, 0, IFBAF_DYNAMIC); 1679 } 1680 1681 if ((bif->bif_flags & IFBIF_STP) != 0 && 1682 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1683 m_freem(m); 1684 bridge_release_member(sc, bif, &psref); 1685 goto out; 1686 } 1687 1688 bridge_release_member(sc, bif, &psref); 1689 1690 /* 1691 * At this point, the port either doesn't participate 1692 * in spanning tree or it is in the forwarding state. 1693 */ 1694 1695 /* 1696 * If the packet is unicast, destined for someone on 1697 * "this" side of the bridge, drop it. 1698 */ 1699 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1700 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1701 if (src_if == dst_if) { 1702 m_freem(m); 1703 goto out; 1704 } 1705 } else { 1706 /* ...forward it to all interfaces. */ 1707 sc->sc_if.if_imcasts++; 1708 dst_if = NULL; 1709 } 1710 1711 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, src_if, PFIL_IN) != 0) { 1712 if (m != NULL) 1713 m_freem(m); 1714 goto out; 1715 } 1716 if (m == NULL) 1717 goto out; 1718 1719 if (dst_if == NULL) { 1720 bridge_broadcast(sc, src_if, m); 1721 goto out; 1722 } 1723 1724 m_put_rcvif_psref(src_if, &psref_src); 1725 src_if = NULL; 1726 1727 /* 1728 * At this point, we're dealing with a unicast frame 1729 * going to a different interface. 1730 */ 1731 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1732 m_freem(m); 1733 goto out; 1734 } 1735 1736 bif = bridge_lookup_member_if(sc, dst_if, &psref); 1737 if (bif == NULL) { 1738 /* Not a member of the bridge (anymore?) */ 1739 m_freem(m); 1740 goto out; 1741 } 1742 1743 if (bif->bif_flags & IFBIF_STP) { 1744 switch (bif->bif_state) { 1745 case BSTP_IFSTATE_DISABLED: 1746 case BSTP_IFSTATE_BLOCKING: 1747 m_freem(m); 1748 bridge_release_member(sc, bif, &psref); 1749 goto out; 1750 } 1751 } 1752 1753 bridge_release_member(sc, bif, &psref); 1754 1755 ACQUIRE_GLOBAL_LOCKS(); 1756 bridge_enqueue(sc, dst_if, m, 1); 1757 RELEASE_GLOBAL_LOCKS(); 1758 out: 1759 if (src_if != NULL) 1760 m_put_rcvif_psref(src_if, &psref_src); 1761 return; 1762 } 1763 1764 static bool 1765 bstp_state_before_learning(struct bridge_iflist *bif) 1766 { 1767 if (bif->bif_flags & IFBIF_STP) { 1768 switch (bif->bif_state) { 1769 case BSTP_IFSTATE_BLOCKING: 1770 case BSTP_IFSTATE_LISTENING: 1771 case BSTP_IFSTATE_DISABLED: 1772 return true; 1773 } 1774 } 1775 return false; 1776 } 1777 1778 static bool 1779 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1780 { 1781 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1782 1783 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1784 #if NCARP > 0 1785 || (bif->bif_ifp->if_carp && 1786 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1787 #endif /* NCARP > 0 */ 1788 ) 1789 return true; 1790 1791 return false; 1792 } 1793 1794 /* 1795 * bridge_input: 1796 * 1797 * Receive input from a member interface. Queue the packet for 1798 * bridging if it is not for us. 1799 */ 1800 static void 1801 bridge_input(struct ifnet *ifp, struct mbuf *m) 1802 { 1803 struct bridge_softc *sc = ifp->if_bridge; 1804 struct bridge_iflist *bif; 1805 struct ether_header *eh; 1806 struct psref psref; 1807 int bound; 1808 DECLARE_LOCK_VARIABLE; 1809 1810 KASSERT(!cpu_intr_p()); 1811 1812 if (__predict_false(sc == NULL) || 1813 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1814 ACQUIRE_GLOBAL_LOCKS(); 1815 ether_input(ifp, m); 1816 RELEASE_GLOBAL_LOCKS(); 1817 return; 1818 } 1819 1820 bound = curlwp_bind(); 1821 bif = bridge_lookup_member_if(sc, ifp, &psref); 1822 if (bif == NULL) { 1823 curlwp_bindx(bound); 1824 ACQUIRE_GLOBAL_LOCKS(); 1825 ether_input(ifp, m); 1826 RELEASE_GLOBAL_LOCKS(); 1827 return; 1828 } 1829 1830 eh = mtod(m, struct ether_header *); 1831 1832 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1833 if (memcmp(etherbroadcastaddr, 1834 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1835 m->m_flags |= M_BCAST; 1836 else 1837 m->m_flags |= M_MCAST; 1838 } 1839 1840 /* 1841 * A 'fast' path for packets addressed to interfaces that are 1842 * part of this bridge. 1843 */ 1844 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 1845 !bstp_state_before_learning(bif)) { 1846 struct bridge_iflist *_bif; 1847 struct ifnet *_ifp = NULL; 1848 int s; 1849 struct psref _psref; 1850 1851 BRIDGE_PSZ_RENTER(s); 1852 BRIDGE_IFLIST_READER_FOREACH(_bif, sc) { 1853 /* It is destined for us. */ 1854 if (bridge_ourether(_bif, eh, 0)) { 1855 bridge_acquire_member(sc, _bif, &_psref); 1856 BRIDGE_PSZ_REXIT(s); 1857 if (_bif->bif_flags & IFBIF_LEARNING) 1858 (void) bridge_rtupdate(sc, 1859 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1860 m_set_rcvif(m, _bif->bif_ifp); 1861 _ifp = _bif->bif_ifp; 1862 bridge_release_member(sc, _bif, &_psref); 1863 goto out; 1864 } 1865 1866 /* We just received a packet that we sent out. */ 1867 if (bridge_ourether(_bif, eh, 1)) 1868 break; 1869 } 1870 BRIDGE_PSZ_REXIT(s); 1871 out: 1872 1873 if (_bif != NULL) { 1874 bridge_release_member(sc, bif, &psref); 1875 curlwp_bindx(bound); 1876 if (_ifp != NULL) { 1877 m->m_flags &= ~M_PROMISC; 1878 ACQUIRE_GLOBAL_LOCKS(); 1879 ether_input(_ifp, m); 1880 RELEASE_GLOBAL_LOCKS(); 1881 } else 1882 m_freem(m); 1883 return; 1884 } 1885 } 1886 1887 /* Tap off 802.1D packets; they do not get forwarded. */ 1888 if (bif->bif_flags & IFBIF_STP && 1889 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 1890 bstp_input(sc, bif, m); 1891 bridge_release_member(sc, bif, &psref); 1892 curlwp_bindx(bound); 1893 return; 1894 } 1895 1896 /* 1897 * A normal switch would discard the packet here, but that's not what 1898 * we've done historically. This also prevents some obnoxious behaviour. 1899 */ 1900 if (bstp_state_before_learning(bif)) { 1901 bridge_release_member(sc, bif, &psref); 1902 curlwp_bindx(bound); 1903 ACQUIRE_GLOBAL_LOCKS(); 1904 ether_input(ifp, m); 1905 RELEASE_GLOBAL_LOCKS(); 1906 return; 1907 } 1908 1909 bridge_release_member(sc, bif, &psref); 1910 1911 bridge_forward(sc, m); 1912 1913 curlwp_bindx(bound); 1914 } 1915 1916 /* 1917 * bridge_broadcast: 1918 * 1919 * Send a frame to all interfaces that are members of 1920 * the bridge, except for the one on which the packet 1921 * arrived. 1922 */ 1923 static void 1924 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1925 struct mbuf *m) 1926 { 1927 struct bridge_iflist *bif; 1928 struct mbuf *mc; 1929 struct ifnet *dst_if; 1930 bool bmcast; 1931 int s; 1932 DECLARE_LOCK_VARIABLE; 1933 1934 bmcast = m->m_flags & (M_BCAST|M_MCAST); 1935 1936 BRIDGE_PSZ_RENTER(s); 1937 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1938 struct psref psref; 1939 1940 bridge_acquire_member(sc, bif, &psref); 1941 BRIDGE_PSZ_REXIT(s); 1942 1943 dst_if = bif->bif_ifp; 1944 1945 if (bif->bif_flags & IFBIF_STP) { 1946 switch (bif->bif_state) { 1947 case BSTP_IFSTATE_BLOCKING: 1948 case BSTP_IFSTATE_DISABLED: 1949 goto next; 1950 } 1951 } 1952 1953 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 1954 goto next; 1955 1956 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1957 goto next; 1958 1959 if (dst_if != src_if) { 1960 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1961 if (mc == NULL) { 1962 sc->sc_if.if_oerrors++; 1963 goto next; 1964 } 1965 ACQUIRE_GLOBAL_LOCKS(); 1966 bridge_enqueue(sc, dst_if, mc, 1); 1967 RELEASE_GLOBAL_LOCKS(); 1968 } 1969 1970 if (bmcast) { 1971 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1972 if (mc == NULL) { 1973 sc->sc_if.if_oerrors++; 1974 goto next; 1975 } 1976 1977 m_set_rcvif(mc, dst_if); 1978 mc->m_flags &= ~M_PROMISC; 1979 1980 ACQUIRE_GLOBAL_LOCKS(); 1981 ether_input(dst_if, mc); 1982 RELEASE_GLOBAL_LOCKS(); 1983 } 1984 next: 1985 BRIDGE_PSZ_RENTER(s); 1986 bridge_release_member(sc, bif, &psref); 1987 } 1988 BRIDGE_PSZ_REXIT(s); 1989 1990 m_freem(m); 1991 } 1992 1993 static int 1994 bridge_rtalloc(struct bridge_softc *sc, const uint8_t *dst, 1995 struct bridge_rtnode **brtp) 1996 { 1997 struct bridge_rtnode *brt; 1998 int error; 1999 2000 if (sc->sc_brtcnt >= sc->sc_brtmax) 2001 return ENOSPC; 2002 2003 /* 2004 * Allocate a new bridge forwarding node, and 2005 * initialize the expiration time and Ethernet 2006 * address. 2007 */ 2008 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 2009 if (brt == NULL) 2010 return ENOMEM; 2011 2012 memset(brt, 0, sizeof(*brt)); 2013 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2014 brt->brt_flags = IFBAF_DYNAMIC; 2015 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2016 2017 BRIDGE_RT_LOCK(sc); 2018 error = bridge_rtnode_insert(sc, brt); 2019 BRIDGE_RT_UNLOCK(sc); 2020 2021 if (error != 0) { 2022 pool_put(&bridge_rtnode_pool, brt); 2023 return error; 2024 } 2025 2026 *brtp = brt; 2027 return 0; 2028 } 2029 2030 /* 2031 * bridge_rtupdate: 2032 * 2033 * Add a bridge routing entry. 2034 */ 2035 static int 2036 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 2037 struct ifnet *dst_if, int setflags, uint8_t flags) 2038 { 2039 struct bridge_rtnode *brt; 2040 int s; 2041 2042 again: 2043 /* 2044 * A route for this destination might already exist. If so, 2045 * update it, otherwise create a new one. 2046 */ 2047 BRIDGE_RT_RENTER(s); 2048 brt = bridge_rtnode_lookup(sc, dst); 2049 2050 if (brt != NULL) { 2051 brt->brt_ifp = dst_if; 2052 if (setflags) { 2053 brt->brt_flags = flags; 2054 if (flags & IFBAF_STATIC) 2055 brt->brt_expire = 0; 2056 else 2057 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2058 } else { 2059 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2060 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2061 } 2062 } 2063 BRIDGE_RT_REXIT(s); 2064 2065 if (brt == NULL) { 2066 int r; 2067 2068 r = bridge_rtalloc(sc, dst, &brt); 2069 if (r != 0) 2070 return r; 2071 goto again; 2072 } 2073 2074 return 0; 2075 } 2076 2077 /* 2078 * bridge_rtlookup: 2079 * 2080 * Lookup the destination interface for an address. 2081 */ 2082 static struct ifnet * 2083 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2084 { 2085 struct bridge_rtnode *brt; 2086 struct ifnet *ifs = NULL; 2087 int s; 2088 2089 BRIDGE_RT_RENTER(s); 2090 brt = bridge_rtnode_lookup(sc, addr); 2091 if (brt != NULL) 2092 ifs = brt->brt_ifp; 2093 BRIDGE_RT_REXIT(s); 2094 2095 return ifs; 2096 } 2097 2098 typedef bool (*bridge_iterate_cb_t) 2099 (struct bridge_softc *, struct bridge_rtnode *, bool *, void *); 2100 2101 /* 2102 * bridge_rtlist_iterate_remove: 2103 * 2104 * It iterates on sc->sc_rtlist and removes rtnodes of it which func 2105 * callback judges to remove. Removals of rtnodes are done in a manner 2106 * of pserialize. To this end, all kmem_* operations are placed out of 2107 * mutexes. 2108 */ 2109 static void 2110 bridge_rtlist_iterate_remove(struct bridge_softc *sc, bridge_iterate_cb_t func, void *arg) 2111 { 2112 struct bridge_rtnode *brt, *nbrt; 2113 struct bridge_rtnode **brt_list; 2114 int i, count; 2115 2116 retry: 2117 count = sc->sc_brtcnt; 2118 if (count == 0) 2119 return; 2120 brt_list = kmem_alloc(sizeof(*brt_list) * count, KM_SLEEP); 2121 2122 BRIDGE_RT_LOCK(sc); 2123 if (__predict_false(sc->sc_brtcnt > count)) { 2124 /* The rtnodes increased, we need more memory */ 2125 BRIDGE_RT_UNLOCK(sc); 2126 kmem_free(brt_list, sizeof(*brt_list) * count); 2127 goto retry; 2128 } 2129 2130 i = 0; 2131 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2132 bool need_break = false; 2133 if (func(sc, brt, &need_break, arg)) { 2134 bridge_rtnode_remove(sc, brt); 2135 brt_list[i++] = brt; 2136 } 2137 if (need_break) 2138 break; 2139 } 2140 2141 if (i > 0) 2142 BRIDGE_RT_PSZ_PERFORM(sc); 2143 BRIDGE_RT_UNLOCK(sc); 2144 2145 while (--i >= 0) 2146 bridge_rtnode_destroy(brt_list[i]); 2147 2148 kmem_free(brt_list, sizeof(*brt_list) * count); 2149 } 2150 2151 static bool 2152 bridge_rttrim0_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2153 bool *need_break, void *arg) 2154 { 2155 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2156 /* Take into account of the subsequent removal */ 2157 if ((sc->sc_brtcnt - 1) <= sc->sc_brtmax) 2158 *need_break = true; 2159 return true; 2160 } else 2161 return false; 2162 } 2163 2164 static void 2165 bridge_rttrim0(struct bridge_softc *sc) 2166 { 2167 bridge_rtlist_iterate_remove(sc, bridge_rttrim0_cb, NULL); 2168 } 2169 2170 /* 2171 * bridge_rttrim: 2172 * 2173 * Trim the routine table so that we have a number 2174 * of routing entries less than or equal to the 2175 * maximum number. 2176 */ 2177 static void 2178 bridge_rttrim(struct bridge_softc *sc) 2179 { 2180 2181 /* Make sure we actually need to do this. */ 2182 if (sc->sc_brtcnt <= sc->sc_brtmax) 2183 return; 2184 2185 /* Force an aging cycle; this might trim enough addresses. */ 2186 bridge_rtage(sc); 2187 if (sc->sc_brtcnt <= sc->sc_brtmax) 2188 return; 2189 2190 bridge_rttrim0(sc); 2191 2192 return; 2193 } 2194 2195 /* 2196 * bridge_timer: 2197 * 2198 * Aging timer for the bridge. 2199 */ 2200 static void 2201 bridge_timer(void *arg) 2202 { 2203 struct bridge_softc *sc = arg; 2204 2205 workqueue_enqueue(sc->sc_rtage_wq, &sc->sc_rtage_wk, NULL); 2206 } 2207 2208 static void 2209 bridge_rtage_work(struct work *wk, void *arg) 2210 { 2211 struct bridge_softc *sc = arg; 2212 2213 KASSERT(wk == &sc->sc_rtage_wk); 2214 2215 bridge_rtage(sc); 2216 2217 if (sc->sc_if.if_flags & IFF_RUNNING) 2218 callout_reset(&sc->sc_brcallout, 2219 bridge_rtable_prune_period * hz, bridge_timer, sc); 2220 } 2221 2222 static bool 2223 bridge_rtage_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2224 bool *need_break, void *arg) 2225 { 2226 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2227 time_uptime >= brt->brt_expire) 2228 return true; 2229 else 2230 return false; 2231 } 2232 2233 /* 2234 * bridge_rtage: 2235 * 2236 * Perform an aging cycle. 2237 */ 2238 static void 2239 bridge_rtage(struct bridge_softc *sc) 2240 { 2241 bridge_rtlist_iterate_remove(sc, bridge_rtage_cb, NULL); 2242 } 2243 2244 2245 static bool 2246 bridge_rtflush_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2247 bool *need_break, void *arg) 2248 { 2249 int full = *(int*)arg; 2250 2251 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2252 return true; 2253 else 2254 return false; 2255 } 2256 2257 /* 2258 * bridge_rtflush: 2259 * 2260 * Remove all dynamic addresses from the bridge. 2261 */ 2262 static void 2263 bridge_rtflush(struct bridge_softc *sc, int full) 2264 { 2265 bridge_rtlist_iterate_remove(sc, bridge_rtflush_cb, &full); 2266 } 2267 2268 /* 2269 * bridge_rtdaddr: 2270 * 2271 * Remove an address from the table. 2272 */ 2273 static int 2274 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2275 { 2276 struct bridge_rtnode *brt; 2277 2278 BRIDGE_RT_LOCK(sc); 2279 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2280 BRIDGE_RT_UNLOCK(sc); 2281 return ENOENT; 2282 } 2283 bridge_rtnode_remove(sc, brt); 2284 BRIDGE_RT_PSZ_PERFORM(sc); 2285 BRIDGE_RT_UNLOCK(sc); 2286 2287 bridge_rtnode_destroy(brt); 2288 2289 return 0; 2290 } 2291 2292 /* 2293 * bridge_rtdelete: 2294 * 2295 * Delete routes to a speicifc member interface. 2296 */ 2297 static void 2298 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2299 { 2300 struct bridge_rtnode *brt; 2301 2302 /* XXX pserialize_perform for each entry is slow */ 2303 again: 2304 BRIDGE_RT_LOCK(sc); 2305 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2306 if (brt->brt_ifp == ifp) 2307 break; 2308 } 2309 if (brt == NULL) { 2310 BRIDGE_RT_UNLOCK(sc); 2311 return; 2312 } 2313 bridge_rtnode_remove(sc, brt); 2314 BRIDGE_RT_PSZ_PERFORM(sc); 2315 BRIDGE_RT_UNLOCK(sc); 2316 2317 bridge_rtnode_destroy(brt); 2318 2319 goto again; 2320 } 2321 2322 /* 2323 * bridge_rtable_init: 2324 * 2325 * Initialize the route table for this bridge. 2326 */ 2327 static void 2328 bridge_rtable_init(struct bridge_softc *sc) 2329 { 2330 int i; 2331 2332 sc->sc_rthash = kmem_alloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2333 KM_SLEEP); 2334 2335 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2336 LIST_INIT(&sc->sc_rthash[i]); 2337 2338 sc->sc_rthash_key = cprng_fast32(); 2339 2340 LIST_INIT(&sc->sc_rtlist); 2341 2342 sc->sc_rtlist_psz = pserialize_create(); 2343 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 2344 } 2345 2346 /* 2347 * bridge_rtable_fini: 2348 * 2349 * Deconstruct the route table for this bridge. 2350 */ 2351 static void 2352 bridge_rtable_fini(struct bridge_softc *sc) 2353 { 2354 2355 kmem_free(sc->sc_rthash, sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE); 2356 if (sc->sc_rtlist_lock) 2357 mutex_obj_free(sc->sc_rtlist_lock); 2358 if (sc->sc_rtlist_psz) 2359 pserialize_destroy(sc->sc_rtlist_psz); 2360 } 2361 2362 /* 2363 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2364 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2365 */ 2366 #define mix(a, b, c) \ 2367 do { \ 2368 a -= b; a -= c; a ^= (c >> 13); \ 2369 b -= c; b -= a; b ^= (a << 8); \ 2370 c -= a; c -= b; c ^= (b >> 13); \ 2371 a -= b; a -= c; a ^= (c >> 12); \ 2372 b -= c; b -= a; b ^= (a << 16); \ 2373 c -= a; c -= b; c ^= (b >> 5); \ 2374 a -= b; a -= c; a ^= (c >> 3); \ 2375 b -= c; b -= a; b ^= (a << 10); \ 2376 c -= a; c -= b; c ^= (b >> 15); \ 2377 } while (/*CONSTCOND*/0) 2378 2379 static inline uint32_t 2380 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2381 { 2382 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2383 2384 b += addr[5] << 8; 2385 b += addr[4]; 2386 a += addr[3] << 24; 2387 a += addr[2] << 16; 2388 a += addr[1] << 8; 2389 a += addr[0]; 2390 2391 mix(a, b, c); 2392 2393 return (c & BRIDGE_RTHASH_MASK); 2394 } 2395 2396 #undef mix 2397 2398 /* 2399 * bridge_rtnode_lookup: 2400 * 2401 * Look up a bridge route node for the specified destination. 2402 */ 2403 static struct bridge_rtnode * 2404 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2405 { 2406 struct bridge_rtnode *brt; 2407 uint32_t hash; 2408 int dir; 2409 2410 hash = bridge_rthash(sc, addr); 2411 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2412 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2413 if (dir == 0) 2414 return brt; 2415 if (dir > 0) 2416 return NULL; 2417 } 2418 2419 return NULL; 2420 } 2421 2422 /* 2423 * bridge_rtnode_insert: 2424 * 2425 * Insert the specified bridge node into the route table. We 2426 * assume the entry is not already in the table. 2427 */ 2428 static int 2429 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2430 { 2431 struct bridge_rtnode *lbrt; 2432 uint32_t hash; 2433 int dir; 2434 2435 KASSERT(BRIDGE_RT_LOCKED(sc)); 2436 2437 hash = bridge_rthash(sc, brt->brt_addr); 2438 2439 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2440 if (lbrt == NULL) { 2441 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2442 goto out; 2443 } 2444 2445 do { 2446 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2447 if (dir == 0) 2448 return EEXIST; 2449 if (dir > 0) { 2450 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2451 goto out; 2452 } 2453 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2454 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2455 goto out; 2456 } 2457 lbrt = LIST_NEXT(lbrt, brt_hash); 2458 } while (lbrt != NULL); 2459 2460 #ifdef DIAGNOSTIC 2461 panic("bridge_rtnode_insert: impossible"); 2462 #endif 2463 2464 out: 2465 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2466 sc->sc_brtcnt++; 2467 2468 return 0; 2469 } 2470 2471 /* 2472 * bridge_rtnode_remove: 2473 * 2474 * Remove a bridge rtnode from the rthash and the rtlist of a bridge. 2475 */ 2476 static void 2477 bridge_rtnode_remove(struct bridge_softc *sc, struct bridge_rtnode *brt) 2478 { 2479 2480 KASSERT(BRIDGE_RT_LOCKED(sc)); 2481 2482 LIST_REMOVE(brt, brt_hash); 2483 LIST_REMOVE(brt, brt_list); 2484 sc->sc_brtcnt--; 2485 } 2486 2487 /* 2488 * bridge_rtnode_destroy: 2489 * 2490 * Destroy a bridge rtnode. 2491 */ 2492 static void 2493 bridge_rtnode_destroy(struct bridge_rtnode *brt) 2494 { 2495 2496 pool_put(&bridge_rtnode_pool, brt); 2497 } 2498 2499 #if defined(BRIDGE_IPF) 2500 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2501 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2502 2503 /* 2504 * Send bridge packets through IPF if they are one of the types IPF can deal 2505 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2506 * question.) 2507 */ 2508 static int 2509 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2510 { 2511 int snap, error; 2512 struct ether_header *eh1, eh2; 2513 struct llc llc1; 2514 uint16_t ether_type; 2515 2516 snap = 0; 2517 error = -1; /* Default error if not error == 0 */ 2518 eh1 = mtod(*mp, struct ether_header *); 2519 ether_type = ntohs(eh1->ether_type); 2520 2521 /* 2522 * Check for SNAP/LLC. 2523 */ 2524 if (ether_type < ETHERMTU) { 2525 struct llc *llc2 = (struct llc *)(eh1 + 1); 2526 2527 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2528 llc2->llc_dsap == LLC_SNAP_LSAP && 2529 llc2->llc_ssap == LLC_SNAP_LSAP && 2530 llc2->llc_control == LLC_UI) { 2531 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2532 snap = 1; 2533 } 2534 } 2535 2536 /* 2537 * If we're trying to filter bridge traffic, don't look at anything 2538 * other than IP and ARP traffic. If the filter doesn't understand 2539 * IPv6, don't allow IPv6 through the bridge either. This is lame 2540 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2541 * but of course we don't have an AppleTalk filter to begin with. 2542 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2543 * ARP traffic.) 2544 */ 2545 switch (ether_type) { 2546 case ETHERTYPE_ARP: 2547 case ETHERTYPE_REVARP: 2548 return 0; /* Automatically pass */ 2549 case ETHERTYPE_IP: 2550 # ifdef INET6 2551 case ETHERTYPE_IPV6: 2552 # endif /* INET6 */ 2553 break; 2554 default: 2555 goto bad; 2556 } 2557 2558 /* Strip off the Ethernet header and keep a copy. */ 2559 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2560 m_adj(*mp, ETHER_HDR_LEN); 2561 2562 /* Strip off snap header, if present */ 2563 if (snap) { 2564 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2565 m_adj(*mp, sizeof(struct llc)); 2566 } 2567 2568 /* 2569 * Check basic packet sanity and run IPF through pfil. 2570 */ 2571 KASSERT(!cpu_intr_p()); 2572 switch (ether_type) 2573 { 2574 case ETHERTYPE_IP : 2575 error = bridge_ip_checkbasic(mp); 2576 if (error == 0) 2577 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2578 break; 2579 # ifdef INET6 2580 case ETHERTYPE_IPV6 : 2581 error = bridge_ip6_checkbasic(mp); 2582 if (error == 0) 2583 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2584 break; 2585 # endif 2586 default : 2587 error = 0; 2588 break; 2589 } 2590 2591 if (*mp == NULL) 2592 return error; 2593 if (error != 0) 2594 goto bad; 2595 2596 error = -1; 2597 2598 /* 2599 * Finally, put everything back the way it was and return 2600 */ 2601 if (snap) { 2602 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2603 if (*mp == NULL) 2604 return error; 2605 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2606 } 2607 2608 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2609 if (*mp == NULL) 2610 return error; 2611 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2612 2613 return 0; 2614 2615 bad: 2616 m_freem(*mp); 2617 *mp = NULL; 2618 return error; 2619 } 2620 2621 /* 2622 * Perform basic checks on header size since 2623 * IPF assumes ip_input has already processed 2624 * it for it. Cut-and-pasted from ip_input.c. 2625 * Given how simple the IPv6 version is, 2626 * does the IPv4 version really need to be 2627 * this complicated? 2628 * 2629 * XXX Should we update ipstat here, or not? 2630 * XXX Right now we update ipstat but not 2631 * XXX csum_counter. 2632 */ 2633 static int 2634 bridge_ip_checkbasic(struct mbuf **mp) 2635 { 2636 struct mbuf *m = *mp; 2637 struct ip *ip; 2638 int len, hlen; 2639 2640 if (*mp == NULL) 2641 return -1; 2642 2643 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2644 if ((m = m_copyup(m, sizeof(struct ip), 2645 (max_linkhdr + 3) & ~3)) == NULL) { 2646 /* XXXJRT new stat, please */ 2647 ip_statinc(IP_STAT_TOOSMALL); 2648 goto bad; 2649 } 2650 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2651 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2652 ip_statinc(IP_STAT_TOOSMALL); 2653 goto bad; 2654 } 2655 } 2656 ip = mtod(m, struct ip *); 2657 if (ip == NULL) goto bad; 2658 2659 if (ip->ip_v != IPVERSION) { 2660 ip_statinc(IP_STAT_BADVERS); 2661 goto bad; 2662 } 2663 hlen = ip->ip_hl << 2; 2664 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2665 ip_statinc(IP_STAT_BADHLEN); 2666 goto bad; 2667 } 2668 if (hlen > m->m_len) { 2669 if ((m = m_pullup(m, hlen)) == 0) { 2670 ip_statinc(IP_STAT_BADHLEN); 2671 goto bad; 2672 } 2673 ip = mtod(m, struct ip *); 2674 if (ip == NULL) goto bad; 2675 } 2676 2677 switch (m->m_pkthdr.csum_flags & 2678 ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_IPv4) | 2679 M_CSUM_IPv4_BAD)) { 2680 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2681 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2682 goto bad; 2683 2684 case M_CSUM_IPv4: 2685 /* Checksum was okay. */ 2686 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2687 break; 2688 2689 default: 2690 /* Must compute it ourselves. */ 2691 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2692 if (in_cksum(m, hlen) != 0) 2693 goto bad; 2694 break; 2695 } 2696 2697 /* Retrieve the packet length. */ 2698 len = ntohs(ip->ip_len); 2699 2700 /* 2701 * Check for additional length bogosity 2702 */ 2703 if (len < hlen) { 2704 ip_statinc(IP_STAT_BADLEN); 2705 goto bad; 2706 } 2707 2708 /* 2709 * Check that the amount of data in the buffers 2710 * is as at least much as the IP header would have us expect. 2711 * Drop packet if shorter than we expect. 2712 */ 2713 if (m->m_pkthdr.len < len) { 2714 ip_statinc(IP_STAT_TOOSHORT); 2715 goto bad; 2716 } 2717 2718 /* Checks out, proceed */ 2719 *mp = m; 2720 return 0; 2721 2722 bad: 2723 *mp = m; 2724 return -1; 2725 } 2726 2727 # ifdef INET6 2728 /* 2729 * Same as above, but for IPv6. 2730 * Cut-and-pasted from ip6_input.c. 2731 * XXX Should we update ip6stat, or not? 2732 */ 2733 static int 2734 bridge_ip6_checkbasic(struct mbuf **mp) 2735 { 2736 struct mbuf *m = *mp; 2737 struct ip6_hdr *ip6; 2738 2739 /* 2740 * If the IPv6 header is not aligned, slurp it up into a new 2741 * mbuf with space for link headers, in the event we forward 2742 * it. Otherwise, if it is aligned, make sure the entire base 2743 * IPv6 header is in the first mbuf of the chain. 2744 */ 2745 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2746 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2747 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2748 (max_linkhdr + 3) & ~3)) == NULL) { 2749 /* XXXJRT new stat, please */ 2750 ip6_statinc(IP6_STAT_TOOSMALL); 2751 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2752 goto bad; 2753 } 2754 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2755 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2756 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2757 ip6_statinc(IP6_STAT_TOOSMALL); 2758 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2759 goto bad; 2760 } 2761 } 2762 2763 ip6 = mtod(m, struct ip6_hdr *); 2764 2765 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2766 ip6_statinc(IP6_STAT_BADVERS); 2767 in6_ifstat_inc(m_get_rcvif_NOMPSAFE(m), ifs6_in_hdrerr); 2768 goto bad; 2769 } 2770 2771 /* Checks out, proceed */ 2772 *mp = m; 2773 return 0; 2774 2775 bad: 2776 *mp = m; 2777 return -1; 2778 } 2779 # endif /* INET6 */ 2780 #endif /* BRIDGE_IPF */ 2781