if_bridge.c revision 1.150
1 /* $NetBSD: if_bridge.c,v 1.150 2018/04/18 03:47:28 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 (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 1.150 2018/04/18 03:47:28 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) 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) 193 194 195 #ifdef NET_MPSAFE 196 #define DECLARE_LOCK_VARIABLE 197 #define ACQUIRE_GLOBAL_LOCKS() do { } while (0) 198 #define RELEASE_GLOBAL_LOCKS() do { } while (0) 199 #else 200 #define DECLARE_LOCK_VARIABLE int __s 201 #define ACQUIRE_GLOBAL_LOCKS() do { \ 202 KERNEL_LOCK(1, NULL); \ 203 mutex_enter(softnet_lock); \ 204 __s = splsoftnet(); \ 205 } while (0) 206 #define RELEASE_GLOBAL_LOCKS() do { \ 207 splx(__s); \ 208 mutex_exit(softnet_lock); \ 209 KERNEL_UNLOCK_ONE(NULL); \ 210 } while (0) 211 #endif 212 213 struct psref_class *bridge_psref_class __read_mostly; 214 215 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 216 217 static struct pool bridge_rtnode_pool; 218 219 static int bridge_clone_create(struct if_clone *, int); 220 static int bridge_clone_destroy(struct ifnet *); 221 222 static int bridge_ioctl(struct ifnet *, u_long, void *); 223 static int bridge_init(struct ifnet *); 224 static void bridge_stop(struct ifnet *, int); 225 static void bridge_start(struct ifnet *); 226 227 static void bridge_input(struct ifnet *, struct mbuf *); 228 static void bridge_forward(struct bridge_softc *, struct mbuf *); 229 230 static void bridge_timer(void *); 231 232 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 233 struct mbuf *); 234 235 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 236 struct ifnet *, int, uint8_t); 237 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 238 static void bridge_rttrim(struct bridge_softc *); 239 static void bridge_rtage(struct bridge_softc *); 240 static void bridge_rtage_work(struct work *, void *); 241 static void bridge_rtflush(struct bridge_softc *, int); 242 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 243 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp); 244 245 static void bridge_rtable_init(struct bridge_softc *); 246 static void bridge_rtable_fini(struct bridge_softc *); 247 248 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 249 const uint8_t *); 250 static int bridge_rtnode_insert(struct bridge_softc *, 251 struct bridge_rtnode *); 252 static void bridge_rtnode_remove(struct bridge_softc *, 253 struct bridge_rtnode *); 254 static void bridge_rtnode_destroy(struct bridge_rtnode *); 255 256 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 257 const char *name, 258 struct psref *); 259 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 260 struct ifnet *ifp, 261 struct psref *); 262 static void bridge_release_member(struct bridge_softc *, struct bridge_iflist *, 263 struct psref *); 264 static void bridge_delete_member(struct bridge_softc *, 265 struct bridge_iflist *); 266 static void bridge_acquire_member(struct bridge_softc *sc, 267 struct bridge_iflist *, 268 struct psref *); 269 270 static int bridge_ioctl_add(struct bridge_softc *, void *); 271 static int bridge_ioctl_del(struct bridge_softc *, void *); 272 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 273 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 274 static int bridge_ioctl_scache(struct bridge_softc *, void *); 275 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 276 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 277 static int bridge_ioctl_rts(struct bridge_softc *, void *); 278 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 279 static int bridge_ioctl_sto(struct bridge_softc *, void *); 280 static int bridge_ioctl_gto(struct bridge_softc *, void *); 281 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 282 static int bridge_ioctl_flush(struct bridge_softc *, void *); 283 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 284 static int bridge_ioctl_spri(struct bridge_softc *, void *); 285 static int bridge_ioctl_ght(struct bridge_softc *, void *); 286 static int bridge_ioctl_sht(struct bridge_softc *, void *); 287 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 288 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 289 static int bridge_ioctl_gma(struct bridge_softc *, void *); 290 static int bridge_ioctl_sma(struct bridge_softc *, void *); 291 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 292 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 293 #if defined(BRIDGE_IPF) 294 static int bridge_ioctl_gfilt(struct bridge_softc *, void *); 295 static int bridge_ioctl_sfilt(struct bridge_softc *, void *); 296 static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int); 297 static int bridge_ip_checkbasic(struct mbuf **mp); 298 # ifdef INET6 299 static int bridge_ip6_checkbasic(struct mbuf **mp); 300 # endif /* INET6 */ 301 #endif /* BRIDGE_IPF */ 302 303 struct bridge_control { 304 int (*bc_func)(struct bridge_softc *, void *); 305 int bc_argsize; 306 int bc_flags; 307 }; 308 309 #define BC_F_COPYIN 0x01 /* copy arguments in */ 310 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 311 #define BC_F_SUSER 0x04 /* do super-user check */ 312 #define BC_F_XLATEIN 0x08 /* xlate arguments in */ 313 #define BC_F_XLATEOUT 0x10 /* xlate arguments out */ 314 315 static const struct bridge_control bridge_control_table[] = { 316 [BRDGADD] = {bridge_ioctl_add, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 317 [BRDGDEL] = {bridge_ioctl_del, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 318 319 [BRDGGIFFLGS] = {bridge_ioctl_gifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_COPYOUT}, 320 [BRDGSIFFLGS] = {bridge_ioctl_sifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 321 322 [BRDGSCACHE] = {bridge_ioctl_scache, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 323 [BRDGGCACHE] = {bridge_ioctl_gcache, sizeof(struct ifbrparam), BC_F_COPYOUT}, 324 325 [OBRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_COPYIN|BC_F_COPYOUT}, 326 [OBRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_COPYIN|BC_F_COPYOUT}, 327 328 [BRDGSADDR] = {bridge_ioctl_saddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 329 330 [BRDGSTO] = {bridge_ioctl_sto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 331 [BRDGGTO] = {bridge_ioctl_gto, sizeof(struct ifbrparam), BC_F_COPYOUT}, 332 333 [BRDGDADDR] = {bridge_ioctl_daddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 334 335 [BRDGFLUSH] = {bridge_ioctl_flush, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 336 337 [BRDGGPRI] = {bridge_ioctl_gpri, sizeof(struct ifbrparam), BC_F_COPYOUT}, 338 [BRDGSPRI] = {bridge_ioctl_spri, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 339 340 [BRDGGHT] = {bridge_ioctl_ght, sizeof(struct ifbrparam), BC_F_COPYOUT}, 341 [BRDGSHT] = {bridge_ioctl_sht, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 342 343 [BRDGGFD] = {bridge_ioctl_gfd, sizeof(struct ifbrparam), BC_F_COPYOUT}, 344 [BRDGSFD] = {bridge_ioctl_sfd, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 345 346 [BRDGGMA] = {bridge_ioctl_gma, sizeof(struct ifbrparam), BC_F_COPYOUT}, 347 [BRDGSMA] = {bridge_ioctl_sma, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 348 349 [BRDGSIFPRIO] = {bridge_ioctl_sifprio, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 350 351 [BRDGSIFCOST] = {bridge_ioctl_sifcost, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 352 #if defined(BRIDGE_IPF) 353 [BRDGGFILT] = {bridge_ioctl_gfilt, sizeof(struct ifbrparam), BC_F_COPYOUT}, 354 [BRDGSFILT] = {bridge_ioctl_sfilt, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 355 #endif /* BRIDGE_IPF */ 356 [BRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 357 [BRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 358 }; 359 360 static const int bridge_control_table_size = __arraycount(bridge_control_table); 361 362 static struct if_clone bridge_cloner = 363 IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy); 364 365 /* 366 * bridgeattach: 367 * 368 * Pseudo-device attach routine. 369 */ 370 void 371 bridgeattach(int n) 372 { 373 374 pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode), 375 0, 0, 0, "brtpl", NULL, IPL_NET); 376 377 bridge_psref_class = psref_class_create("bridge", IPL_SOFTNET); 378 379 if_clone_attach(&bridge_cloner); 380 } 381 382 /* 383 * bridge_clone_create: 384 * 385 * Create a new bridge instance. 386 */ 387 static int 388 bridge_clone_create(struct if_clone *ifc, int unit) 389 { 390 struct bridge_softc *sc; 391 struct ifnet *ifp; 392 int error; 393 394 sc = kmem_zalloc(sizeof(*sc), KM_SLEEP); 395 ifp = &sc->sc_if; 396 397 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 398 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 399 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 400 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 401 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 402 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 403 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 404 sc->sc_filter_flags = 0; 405 406 /* Initialize our routing table. */ 407 bridge_rtable_init(sc); 408 409 error = workqueue_create(&sc->sc_rtage_wq, "bridge_rtage", 410 bridge_rtage_work, sc, PRI_SOFTNET, IPL_SOFTNET, WQ_MPSAFE); 411 if (error) 412 panic("%s: workqueue_create %d\n", __func__, error); 413 414 callout_init(&sc->sc_brcallout, CALLOUT_MPSAFE); 415 callout_init(&sc->sc_bstpcallout, CALLOUT_MPSAFE); 416 417 mutex_init(&sc->sc_iflist_psref.bip_lock, MUTEX_DEFAULT, IPL_NONE); 418 PSLIST_INIT(&sc->sc_iflist_psref.bip_iflist); 419 sc->sc_iflist_psref.bip_psz = pserialize_create(); 420 421 if_initname(ifp, ifc->ifc_name, unit); 422 ifp->if_softc = sc; 423 ifp->if_extflags = IFEF_NO_LINK_STATE_CHANGE; 424 #ifdef NET_MPSAFE 425 ifp->if_extflags |= IFEF_MPSAFE; 426 #endif 427 ifp->if_mtu = ETHERMTU; 428 ifp->if_ioctl = bridge_ioctl; 429 ifp->if_output = bridge_output; 430 ifp->if_start = bridge_start; 431 ifp->if_stop = bridge_stop; 432 ifp->if_init = bridge_init; 433 ifp->if_type = IFT_BRIDGE; 434 ifp->if_addrlen = 0; 435 ifp->if_dlt = DLT_EN10MB; 436 ifp->if_hdrlen = ETHER_HDR_LEN; 437 438 error = if_initialize(ifp); 439 if (error != 0) { 440 pserialize_destroy(sc->sc_iflist_psref.bip_psz); 441 mutex_destroy(&sc->sc_iflist_psref.bip_lock); 442 callout_destroy(&sc->sc_brcallout); 443 callout_destroy(&sc->sc_bstpcallout); 444 workqueue_destroy(sc->sc_rtage_wq); 445 bridge_rtable_fini(sc); 446 kmem_free(sc, sizeof(*sc)); 447 448 return error; 449 } 450 if_register(ifp); 451 452 if_alloc_sadl(ifp); 453 454 return 0; 455 } 456 457 /* 458 * bridge_clone_destroy: 459 * 460 * Destroy a bridge instance. 461 */ 462 static int 463 bridge_clone_destroy(struct ifnet *ifp) 464 { 465 struct bridge_softc *sc = ifp->if_softc; 466 struct bridge_iflist *bif; 467 468 if ((ifp->if_flags & IFF_RUNNING) != 0) 469 bridge_stop(ifp, 1); 470 471 BRIDGE_LOCK(sc); 472 for (;;) { 473 bif = PSLIST_WRITER_FIRST(&sc->sc_iflist_psref.bip_iflist, struct bridge_iflist, 474 bif_next); 475 if (bif == NULL) 476 break; 477 bridge_delete_member(sc, bif); 478 } 479 PSLIST_DESTROY(&sc->sc_iflist_psref.bip_iflist); 480 BRIDGE_UNLOCK(sc); 481 482 if_detach(ifp); 483 484 /* Tear down the routing table. */ 485 bridge_rtable_fini(sc); 486 487 pserialize_destroy(sc->sc_iflist_psref.bip_psz); 488 mutex_destroy(&sc->sc_iflist_psref.bip_lock); 489 callout_destroy(&sc->sc_brcallout); 490 callout_destroy(&sc->sc_bstpcallout); 491 workqueue_destroy(sc->sc_rtage_wq); 492 kmem_free(sc, sizeof(*sc)); 493 494 return 0; 495 } 496 497 /* 498 * bridge_ioctl: 499 * 500 * Handle a control request from the operator. 501 */ 502 static int 503 bridge_ioctl(struct ifnet *ifp, u_long cmd, void *data) 504 { 505 struct bridge_softc *sc = ifp->if_softc; 506 struct lwp *l = curlwp; /* XXX */ 507 union { 508 struct ifbreq ifbreq; 509 struct ifbifconf ifbifconf; 510 struct ifbareq ifbareq; 511 struct ifbaconf ifbaconf; 512 struct ifbrparam ifbrparam; 513 } args; 514 struct ifdrv *ifd = (struct ifdrv *) data; 515 const struct bridge_control *bc = NULL; /* XXXGCC */ 516 int s, error = 0; 517 518 /* Authorize command before calling splsoftnet(). */ 519 switch (cmd) { 520 case SIOCGDRVSPEC: 521 case SIOCSDRVSPEC: 522 if (ifd->ifd_cmd >= bridge_control_table_size 523 || (bc = &bridge_control_table[ifd->ifd_cmd]) == NULL) { 524 error = EINVAL; 525 return error; 526 } 527 528 /* We only care about BC_F_SUSER at this point. */ 529 if ((bc->bc_flags & BC_F_SUSER) == 0) 530 break; 531 532 error = kauth_authorize_network(l->l_cred, 533 KAUTH_NETWORK_INTERFACE_BRIDGE, 534 cmd == SIOCGDRVSPEC ? 535 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_GETPRIV : 536 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_SETPRIV, 537 ifd, NULL, NULL); 538 if (error) 539 return error; 540 541 break; 542 } 543 544 s = splsoftnet(); 545 546 switch (cmd) { 547 case SIOCGDRVSPEC: 548 case SIOCSDRVSPEC: 549 KASSERT(bc != NULL); 550 if (cmd == SIOCGDRVSPEC && 551 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) == 0) { 552 error = EINVAL; 553 break; 554 } 555 else if (cmd == SIOCSDRVSPEC && 556 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) != 0) { 557 error = EINVAL; 558 break; 559 } 560 561 /* BC_F_SUSER is checked above, before splsoftnet(). */ 562 563 if ((bc->bc_flags & (BC_F_XLATEIN|BC_F_XLATEOUT)) == 0 564 && (ifd->ifd_len != bc->bc_argsize 565 || ifd->ifd_len > sizeof(args))) { 566 error = EINVAL; 567 break; 568 } 569 570 memset(&args, 0, sizeof(args)); 571 if (bc->bc_flags & BC_F_COPYIN) { 572 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 573 if (error) 574 break; 575 } else if (bc->bc_flags & BC_F_XLATEIN) { 576 args.ifbifconf.ifbic_len = ifd->ifd_len; 577 args.ifbifconf.ifbic_buf = ifd->ifd_data; 578 } 579 580 error = (*bc->bc_func)(sc, &args); 581 if (error) 582 break; 583 584 if (bc->bc_flags & BC_F_COPYOUT) { 585 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 586 } else if (bc->bc_flags & BC_F_XLATEOUT) { 587 ifd->ifd_len = args.ifbifconf.ifbic_len; 588 ifd->ifd_data = args.ifbifconf.ifbic_buf; 589 } 590 break; 591 592 case SIOCSIFFLAGS: 593 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 594 break; 595 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 596 case IFF_RUNNING: 597 /* 598 * If interface is marked down and it is running, 599 * then stop and disable it. 600 */ 601 (*ifp->if_stop)(ifp, 1); 602 break; 603 case IFF_UP: 604 /* 605 * If interface is marked up and it is stopped, then 606 * start it. 607 */ 608 error = (*ifp->if_init)(ifp); 609 break; 610 default: 611 break; 612 } 613 break; 614 615 case SIOCSIFMTU: 616 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 617 error = 0; 618 break; 619 620 default: 621 error = ifioctl_common(ifp, cmd, data); 622 break; 623 } 624 625 splx(s); 626 627 return error; 628 } 629 630 /* 631 * bridge_lookup_member: 632 * 633 * Lookup a bridge member interface. 634 */ 635 static struct bridge_iflist * 636 bridge_lookup_member(struct bridge_softc *sc, const char *name, struct psref *psref) 637 { 638 struct bridge_iflist *bif; 639 struct ifnet *ifp; 640 int s; 641 642 BRIDGE_PSZ_RENTER(s); 643 644 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 645 ifp = bif->bif_ifp; 646 if (strcmp(ifp->if_xname, name) == 0) 647 break; 648 } 649 if (bif != NULL) 650 bridge_acquire_member(sc, bif, psref); 651 652 BRIDGE_PSZ_REXIT(s); 653 654 return bif; 655 } 656 657 /* 658 * bridge_lookup_member_if: 659 * 660 * Lookup a bridge member interface by ifnet*. 661 */ 662 static struct bridge_iflist * 663 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp, 664 struct psref *psref) 665 { 666 struct bridge_iflist *bif; 667 int s; 668 669 BRIDGE_PSZ_RENTER(s); 670 671 bif = member_ifp->if_bridgeif; 672 if (bif != NULL) { 673 psref_acquire(psref, &bif->bif_psref, 674 bridge_psref_class); 675 } 676 677 BRIDGE_PSZ_REXIT(s); 678 679 return bif; 680 } 681 682 static void 683 bridge_acquire_member(struct bridge_softc *sc, struct bridge_iflist *bif, 684 struct psref *psref) 685 { 686 687 psref_acquire(psref, &bif->bif_psref, bridge_psref_class); 688 } 689 690 /* 691 * bridge_release_member: 692 * 693 * Release the specified member interface. 694 */ 695 static void 696 bridge_release_member(struct bridge_softc *sc, struct bridge_iflist *bif, 697 struct psref *psref) 698 { 699 700 psref_release(psref, &bif->bif_psref, bridge_psref_class); 701 } 702 703 /* 704 * bridge_delete_member: 705 * 706 * Delete the specified member interface. 707 */ 708 static void 709 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 710 { 711 struct ifnet *ifs = bif->bif_ifp; 712 713 KASSERT(BRIDGE_LOCKED(sc)); 714 715 ifs->_if_input = ether_input; 716 ifs->if_bridge = NULL; 717 ifs->if_bridgeif = NULL; 718 719 PSLIST_WRITER_REMOVE(bif, bif_next); 720 BRIDGE_PSZ_PERFORM(sc); 721 BRIDGE_UNLOCK(sc); 722 723 psref_target_destroy(&bif->bif_psref, bridge_psref_class); 724 725 PSLIST_ENTRY_DESTROY(bif, bif_next); 726 kmem_free(bif, sizeof(*bif)); 727 728 BRIDGE_LOCK(sc); 729 } 730 731 static int 732 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 733 { 734 struct ifbreq *req = arg; 735 struct bridge_iflist *bif = NULL; 736 struct ifnet *ifs; 737 int error = 0; 738 struct psref psref; 739 740 ifs = if_get(req->ifbr_ifsname, &psref); 741 if (ifs == NULL) 742 return ENOENT; 743 744 if (ifs->if_bridge == sc) { 745 error = EEXIST; 746 goto out; 747 } 748 749 if (ifs->if_bridge != NULL) { 750 error = EBUSY; 751 goto out; 752 } 753 754 if (ifs->_if_input != ether_input) { 755 error = EINVAL; 756 goto out; 757 } 758 759 /* FIXME: doesn't work with non-IFF_SIMPLEX interfaces */ 760 if ((ifs->if_flags & IFF_SIMPLEX) == 0) { 761 error = EINVAL; 762 goto out; 763 } 764 765 bif = kmem_alloc(sizeof(*bif), KM_SLEEP); 766 767 switch (ifs->if_type) { 768 case IFT_ETHER: 769 if (sc->sc_if.if_mtu != ifs->if_mtu) { 770 error = EINVAL; 771 goto out; 772 } 773 /* FALLTHROUGH */ 774 case IFT_L2TP: 775 IFNET_LOCK(ifs); 776 error = ether_enable_vlan_mtu(ifs); 777 IFNET_UNLOCK(ifs); 778 if (error > 0) 779 goto out; 780 /* 781 * Place the interface into promiscuous mode. 782 */ 783 error = ifpromisc(ifs, 1); 784 if (error) 785 goto out; 786 break; 787 default: 788 error = EINVAL; 789 goto out; 790 } 791 792 bif->bif_ifp = ifs; 793 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 794 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 795 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 796 PSLIST_ENTRY_INIT(bif, bif_next); 797 psref_target_init(&bif->bif_psref, bridge_psref_class); 798 799 BRIDGE_LOCK(sc); 800 801 ifs->if_bridge = sc; 802 ifs->if_bridgeif = bif; 803 PSLIST_WRITER_INSERT_HEAD(&sc->sc_iflist_psref.bip_iflist, bif, bif_next); 804 ifs->_if_input = bridge_input; 805 806 BRIDGE_UNLOCK(sc); 807 808 if (sc->sc_if.if_flags & IFF_RUNNING) 809 bstp_initialization(sc); 810 else 811 bstp_stop(sc); 812 813 out: 814 if_put(ifs, &psref); 815 if (error) { 816 if (bif != NULL) 817 kmem_free(bif, sizeof(*bif)); 818 } 819 return error; 820 } 821 822 static int 823 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 824 { 825 struct ifbreq *req = arg; 826 const char *name = req->ifbr_ifsname; 827 struct bridge_iflist *bif; 828 struct ifnet *ifs; 829 830 BRIDGE_LOCK(sc); 831 832 /* 833 * Don't use bridge_lookup_member. We want to get a member 834 * with bif_refs == 0. 835 */ 836 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 837 ifs = bif->bif_ifp; 838 if (strcmp(ifs->if_xname, name) == 0) 839 break; 840 } 841 842 if (bif == NULL) { 843 BRIDGE_UNLOCK(sc); 844 return ENOENT; 845 } 846 847 bridge_delete_member(sc, bif); 848 849 BRIDGE_UNLOCK(sc); 850 851 switch (ifs->if_type) { 852 case IFT_ETHER: 853 case IFT_L2TP: 854 /* 855 * Take the interface out of promiscuous mode. 856 * Don't call it with holding a spin lock. 857 */ 858 (void) ifpromisc(ifs, 0); 859 IFNET_LOCK(ifs); 860 (void) ether_disable_vlan_mtu(ifs); 861 IFNET_UNLOCK(ifs); 862 break; 863 default: 864 #ifdef DIAGNOSTIC 865 panic("bridge_delete_member: impossible"); 866 #endif 867 break; 868 } 869 870 bridge_rtdelete(sc, ifs); 871 872 if (sc->sc_if.if_flags & IFF_RUNNING) 873 bstp_initialization(sc); 874 875 return 0; 876 } 877 878 static int 879 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 880 { 881 struct ifbreq *req = arg; 882 struct bridge_iflist *bif; 883 struct psref psref; 884 885 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 886 if (bif == NULL) 887 return ENOENT; 888 889 req->ifbr_ifsflags = bif->bif_flags; 890 req->ifbr_state = bif->bif_state; 891 req->ifbr_priority = bif->bif_priority; 892 req->ifbr_path_cost = bif->bif_path_cost; 893 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 894 895 bridge_release_member(sc, bif, &psref); 896 897 return 0; 898 } 899 900 static int 901 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 902 { 903 struct ifbreq *req = arg; 904 struct bridge_iflist *bif; 905 struct psref psref; 906 907 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 908 if (bif == NULL) 909 return ENOENT; 910 911 if (req->ifbr_ifsflags & IFBIF_STP) { 912 switch (bif->bif_ifp->if_type) { 913 case IFT_ETHER: 914 case IFT_L2TP: 915 /* These can do spanning tree. */ 916 break; 917 918 default: 919 /* Nothing else can. */ 920 bridge_release_member(sc, bif, &psref); 921 return EINVAL; 922 } 923 } 924 925 bif->bif_flags = req->ifbr_ifsflags; 926 927 bridge_release_member(sc, bif, &psref); 928 929 if (sc->sc_if.if_flags & IFF_RUNNING) 930 bstp_initialization(sc); 931 932 return 0; 933 } 934 935 static int 936 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 937 { 938 struct ifbrparam *param = arg; 939 940 sc->sc_brtmax = param->ifbrp_csize; 941 bridge_rttrim(sc); 942 943 return 0; 944 } 945 946 static int 947 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 948 { 949 struct ifbrparam *param = arg; 950 951 param->ifbrp_csize = sc->sc_brtmax; 952 953 return 0; 954 } 955 956 static int 957 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 958 { 959 struct ifbifconf *bifc = arg; 960 struct bridge_iflist *bif; 961 struct ifbreq *breqs; 962 int i, count, error = 0; 963 964 retry: 965 BRIDGE_LOCK(sc); 966 count = 0; 967 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 968 count++; 969 BRIDGE_UNLOCK(sc); 970 971 if (count == 0) { 972 bifc->ifbic_len = 0; 973 return 0; 974 } 975 976 if (bifc->ifbic_len == 0 || bifc->ifbic_len < (sizeof(*breqs) * count)) { 977 /* Tell that a larger buffer is needed */ 978 bifc->ifbic_len = sizeof(*breqs) * count; 979 return 0; 980 } 981 982 breqs = kmem_alloc(sizeof(*breqs) * count, KM_SLEEP); 983 984 BRIDGE_LOCK(sc); 985 986 i = 0; 987 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 988 i++; 989 if (i > count) { 990 /* 991 * The number of members has been increased. 992 * We need more memory! 993 */ 994 BRIDGE_UNLOCK(sc); 995 kmem_free(breqs, sizeof(*breqs) * count); 996 goto retry; 997 } 998 999 i = 0; 1000 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 1001 struct ifbreq *breq = &breqs[i++]; 1002 memset(breq, 0, sizeof(*breq)); 1003 1004 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, 1005 sizeof(breq->ifbr_ifsname)); 1006 breq->ifbr_ifsflags = bif->bif_flags; 1007 breq->ifbr_state = bif->bif_state; 1008 breq->ifbr_priority = bif->bif_priority; 1009 breq->ifbr_path_cost = bif->bif_path_cost; 1010 breq->ifbr_portno = bif->bif_ifp->if_index & 0xff; 1011 } 1012 1013 /* Don't call copyout with holding the mutex */ 1014 BRIDGE_UNLOCK(sc); 1015 1016 for (i = 0; i < count; i++) { 1017 error = copyout(&breqs[i], bifc->ifbic_req + i, sizeof(*breqs)); 1018 if (error) 1019 break; 1020 } 1021 bifc->ifbic_len = sizeof(*breqs) * i; 1022 1023 kmem_free(breqs, sizeof(*breqs) * count); 1024 1025 return error; 1026 } 1027 1028 static int 1029 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1030 { 1031 struct ifbaconf *bac = arg; 1032 struct bridge_rtnode *brt; 1033 struct ifbareq bareq; 1034 int count = 0, error = 0, len; 1035 1036 if (bac->ifbac_len == 0) 1037 return 0; 1038 1039 BRIDGE_RT_LOCK(sc); 1040 1041 len = bac->ifbac_len; 1042 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1043 if (len < sizeof(bareq)) 1044 goto out; 1045 memset(&bareq, 0, sizeof(bareq)); 1046 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1047 sizeof(bareq.ifba_ifsname)); 1048 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1049 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1050 bareq.ifba_expire = brt->brt_expire - time_uptime; 1051 } else 1052 bareq.ifba_expire = 0; 1053 bareq.ifba_flags = brt->brt_flags; 1054 1055 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1056 if (error) 1057 goto out; 1058 count++; 1059 len -= sizeof(bareq); 1060 } 1061 out: 1062 BRIDGE_RT_UNLOCK(sc); 1063 1064 bac->ifbac_len = sizeof(bareq) * count; 1065 return error; 1066 } 1067 1068 static int 1069 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1070 { 1071 struct ifbareq *req = arg; 1072 struct bridge_iflist *bif; 1073 int error; 1074 struct psref psref; 1075 1076 bif = bridge_lookup_member(sc, req->ifba_ifsname, &psref); 1077 if (bif == NULL) 1078 return ENOENT; 1079 1080 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1081 req->ifba_flags); 1082 1083 bridge_release_member(sc, bif, &psref); 1084 1085 return error; 1086 } 1087 1088 static int 1089 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1090 { 1091 struct ifbrparam *param = arg; 1092 1093 sc->sc_brttimeout = param->ifbrp_ctime; 1094 1095 return 0; 1096 } 1097 1098 static int 1099 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1100 { 1101 struct ifbrparam *param = arg; 1102 1103 param->ifbrp_ctime = sc->sc_brttimeout; 1104 1105 return 0; 1106 } 1107 1108 static int 1109 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1110 { 1111 struct ifbareq *req = arg; 1112 1113 return (bridge_rtdaddr(sc, req->ifba_dst)); 1114 } 1115 1116 static int 1117 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1118 { 1119 struct ifbreq *req = arg; 1120 1121 bridge_rtflush(sc, req->ifbr_ifsflags); 1122 1123 return 0; 1124 } 1125 1126 static int 1127 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1128 { 1129 struct ifbrparam *param = arg; 1130 1131 param->ifbrp_prio = sc->sc_bridge_priority; 1132 1133 return 0; 1134 } 1135 1136 static int 1137 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1138 { 1139 struct ifbrparam *param = arg; 1140 1141 sc->sc_bridge_priority = param->ifbrp_prio; 1142 1143 if (sc->sc_if.if_flags & IFF_RUNNING) 1144 bstp_initialization(sc); 1145 1146 return 0; 1147 } 1148 1149 static int 1150 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1151 { 1152 struct ifbrparam *param = arg; 1153 1154 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1155 1156 return 0; 1157 } 1158 1159 static int 1160 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1161 { 1162 struct ifbrparam *param = arg; 1163 1164 if (param->ifbrp_hellotime == 0) 1165 return EINVAL; 1166 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1167 1168 if (sc->sc_if.if_flags & IFF_RUNNING) 1169 bstp_initialization(sc); 1170 1171 return 0; 1172 } 1173 1174 static int 1175 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1176 { 1177 struct ifbrparam *param = arg; 1178 1179 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1180 1181 return 0; 1182 } 1183 1184 static int 1185 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1186 { 1187 struct ifbrparam *param = arg; 1188 1189 if (param->ifbrp_fwddelay == 0) 1190 return EINVAL; 1191 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1192 1193 if (sc->sc_if.if_flags & IFF_RUNNING) 1194 bstp_initialization(sc); 1195 1196 return 0; 1197 } 1198 1199 static int 1200 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1201 { 1202 struct ifbrparam *param = arg; 1203 1204 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1205 1206 return 0; 1207 } 1208 1209 static int 1210 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1211 { 1212 struct ifbrparam *param = arg; 1213 1214 if (param->ifbrp_maxage == 0) 1215 return EINVAL; 1216 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1217 1218 if (sc->sc_if.if_flags & IFF_RUNNING) 1219 bstp_initialization(sc); 1220 1221 return 0; 1222 } 1223 1224 static int 1225 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1226 { 1227 struct ifbreq *req = arg; 1228 struct bridge_iflist *bif; 1229 struct psref psref; 1230 1231 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1232 if (bif == NULL) 1233 return ENOENT; 1234 1235 bif->bif_priority = req->ifbr_priority; 1236 1237 if (sc->sc_if.if_flags & IFF_RUNNING) 1238 bstp_initialization(sc); 1239 1240 bridge_release_member(sc, bif, &psref); 1241 1242 return 0; 1243 } 1244 1245 #if defined(BRIDGE_IPF) 1246 static int 1247 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1248 { 1249 struct ifbrparam *param = arg; 1250 1251 param->ifbrp_filter = sc->sc_filter_flags; 1252 1253 return 0; 1254 } 1255 1256 static int 1257 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1258 { 1259 struct ifbrparam *param = arg; 1260 uint32_t nflags, oflags; 1261 1262 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1263 return EINVAL; 1264 1265 nflags = param->ifbrp_filter; 1266 oflags = sc->sc_filter_flags; 1267 1268 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1269 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1270 sc->sc_if.if_pfil); 1271 } 1272 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1273 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1274 sc->sc_if.if_pfil); 1275 } 1276 1277 sc->sc_filter_flags = nflags; 1278 1279 return 0; 1280 } 1281 #endif /* BRIDGE_IPF */ 1282 1283 static int 1284 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1285 { 1286 struct ifbreq *req = arg; 1287 struct bridge_iflist *bif; 1288 struct psref psref; 1289 1290 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1291 if (bif == NULL) 1292 return ENOENT; 1293 1294 bif->bif_path_cost = req->ifbr_path_cost; 1295 1296 if (sc->sc_if.if_flags & IFF_RUNNING) 1297 bstp_initialization(sc); 1298 1299 bridge_release_member(sc, bif, &psref); 1300 1301 return 0; 1302 } 1303 1304 /* 1305 * bridge_ifdetach: 1306 * 1307 * Detach an interface from a bridge. Called when a member 1308 * interface is detaching. 1309 */ 1310 void 1311 bridge_ifdetach(struct ifnet *ifp) 1312 { 1313 struct bridge_softc *sc = ifp->if_bridge; 1314 struct ifbreq breq; 1315 1316 /* ioctl_lock should prevent this from happening */ 1317 KASSERT(sc != NULL); 1318 1319 memset(&breq, 0, sizeof(breq)); 1320 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1321 1322 (void) bridge_ioctl_del(sc, &breq); 1323 } 1324 1325 /* 1326 * bridge_init: 1327 * 1328 * Initialize a bridge interface. 1329 */ 1330 static int 1331 bridge_init(struct ifnet *ifp) 1332 { 1333 struct bridge_softc *sc = ifp->if_softc; 1334 1335 KASSERT((ifp->if_flags & IFF_RUNNING) == 0); 1336 1337 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1338 bridge_timer, sc); 1339 bstp_initialization(sc); 1340 1341 ifp->if_flags |= IFF_RUNNING; 1342 return 0; 1343 } 1344 1345 /* 1346 * bridge_stop: 1347 * 1348 * Stop the bridge interface. 1349 */ 1350 static void 1351 bridge_stop(struct ifnet *ifp, int disable) 1352 { 1353 struct bridge_softc *sc = ifp->if_softc; 1354 1355 KASSERT((ifp->if_flags & IFF_RUNNING) != 0); 1356 ifp->if_flags &= ~IFF_RUNNING; 1357 1358 callout_halt(&sc->sc_brcallout, NULL); 1359 workqueue_wait(sc->sc_rtage_wq, &sc->sc_rtage_wk); 1360 bstp_stop(sc); 1361 bridge_rtflush(sc, IFBF_FLUSHDYN); 1362 } 1363 1364 /* 1365 * bridge_enqueue: 1366 * 1367 * Enqueue a packet on a bridge member interface. 1368 */ 1369 void 1370 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1371 int runfilt) 1372 { 1373 int len, error; 1374 short mflags; 1375 1376 /* 1377 * Clear any in-bound checksum flags for this packet. 1378 */ 1379 m->m_pkthdr.csum_flags = 0; 1380 1381 if (runfilt) { 1382 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1383 dst_ifp, PFIL_OUT) != 0) { 1384 if (m != NULL) 1385 m_freem(m); 1386 return; 1387 } 1388 if (m == NULL) 1389 return; 1390 } 1391 1392 #ifdef ALTQ 1393 KERNEL_LOCK(1, NULL); 1394 /* 1395 * If ALTQ is enabled on the member interface, do 1396 * classification; the queueing discipline might 1397 * not require classification, but might require 1398 * the address family/header pointer in the pktattr. 1399 */ 1400 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1401 /* XXX IFT_ETHER */ 1402 altq_etherclassify(&dst_ifp->if_snd, m); 1403 } 1404 KERNEL_UNLOCK_ONE(NULL); 1405 #endif /* ALTQ */ 1406 1407 len = m->m_pkthdr.len; 1408 mflags = m->m_flags; 1409 1410 error = if_transmit_lock(dst_ifp, m); 1411 if (error) { 1412 /* mbuf is already freed */ 1413 sc->sc_if.if_oerrors++; 1414 return; 1415 } 1416 1417 sc->sc_if.if_opackets++; 1418 sc->sc_if.if_obytes += len; 1419 if (mflags & M_MCAST) 1420 sc->sc_if.if_omcasts++; 1421 } 1422 1423 /* 1424 * bridge_output: 1425 * 1426 * Send output from a bridge member interface. This 1427 * performs the bridging function for locally originated 1428 * packets. 1429 * 1430 * The mbuf has the Ethernet header already attached. We must 1431 * enqueue or free the mbuf before returning. 1432 */ 1433 int 1434 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1435 const struct rtentry *rt) 1436 { 1437 struct ether_header *eh; 1438 struct ifnet *dst_if; 1439 struct bridge_softc *sc; 1440 int s; 1441 1442 /* 1443 * bridge_output() is called from ether_output(), furthermore 1444 * ifp argument doesn't point to bridge(4). So, don't assert 1445 * IFEF_MPSAFE here. 1446 */ 1447 1448 if (m->m_len < ETHER_HDR_LEN) { 1449 m = m_pullup(m, ETHER_HDR_LEN); 1450 if (m == NULL) 1451 return 0; 1452 } 1453 1454 eh = mtod(m, struct ether_header *); 1455 sc = ifp->if_bridge; 1456 1457 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1458 if (memcmp(etherbroadcastaddr, 1459 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1460 m->m_flags |= M_BCAST; 1461 else 1462 m->m_flags |= M_MCAST; 1463 } 1464 1465 /* 1466 * If bridge is down, but the original output interface is up, 1467 * go ahead and send out that interface. Otherwise, the packet 1468 * is dropped below. 1469 */ 1470 if (__predict_false(sc == NULL) || 1471 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1472 dst_if = ifp; 1473 goto sendunicast; 1474 } 1475 1476 /* 1477 * If the packet is a multicast, or we don't know a better way to 1478 * get there, send to all interfaces. 1479 */ 1480 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0) 1481 dst_if = NULL; 1482 else 1483 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1484 if (dst_if == NULL) { 1485 /* XXX Should call bridge_broadcast, but there are locking 1486 * issues which need resolving first. */ 1487 struct bridge_iflist *bif; 1488 struct mbuf *mc; 1489 bool used = false; 1490 1491 BRIDGE_PSZ_RENTER(s); 1492 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1493 struct psref psref; 1494 1495 bridge_acquire_member(sc, bif, &psref); 1496 BRIDGE_PSZ_REXIT(s); 1497 1498 dst_if = bif->bif_ifp; 1499 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1500 goto next; 1501 1502 /* 1503 * If this is not the original output interface, 1504 * and the interface is participating in spanning 1505 * tree, make sure the port is in a state that 1506 * allows forwarding. 1507 */ 1508 if (dst_if != ifp && 1509 (bif->bif_flags & IFBIF_STP) != 0) { 1510 switch (bif->bif_state) { 1511 case BSTP_IFSTATE_BLOCKING: 1512 case BSTP_IFSTATE_LISTENING: 1513 case BSTP_IFSTATE_DISABLED: 1514 goto next; 1515 } 1516 } 1517 1518 if (PSLIST_READER_NEXT(bif, struct bridge_iflist, 1519 bif_next) == NULL && 1520 ((m->m_flags & (M_MCAST | M_BCAST)) == 0 || 1521 dst_if == ifp)) 1522 { 1523 used = true; 1524 mc = m; 1525 } else { 1526 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1527 if (mc == NULL) { 1528 sc->sc_if.if_oerrors++; 1529 goto next; 1530 } 1531 } 1532 1533 bridge_enqueue(sc, dst_if, mc, 0); 1534 1535 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0 && 1536 dst_if != ifp) 1537 { 1538 if (PSLIST_READER_NEXT(bif, 1539 struct bridge_iflist, bif_next) == NULL) 1540 { 1541 used = true; 1542 mc = m; 1543 } else { 1544 mc = m_copym(m, 0, M_COPYALL, 1545 M_DONTWAIT); 1546 if (mc == NULL) { 1547 sc->sc_if.if_oerrors++; 1548 goto next; 1549 } 1550 } 1551 1552 m_set_rcvif(mc, dst_if); 1553 mc->m_flags &= ~M_PROMISC; 1554 1555 #ifndef NET_MPSAFE 1556 s = splsoftnet(); 1557 #endif 1558 ether_input(dst_if, mc); 1559 #ifndef NET_MPSAFE 1560 splx(s); 1561 #endif 1562 } 1563 1564 next: 1565 BRIDGE_PSZ_RENTER(s); 1566 bridge_release_member(sc, bif, &psref); 1567 1568 /* Guarantee we don't re-enter the loop as we already 1569 * decided we're at the end. */ 1570 if (used) 1571 break; 1572 } 1573 BRIDGE_PSZ_REXIT(s); 1574 1575 if (!used) 1576 m_freem(m); 1577 return 0; 1578 } 1579 1580 sendunicast: 1581 /* 1582 * XXX Spanning tree consideration here? 1583 */ 1584 1585 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1586 m_freem(m); 1587 return 0; 1588 } 1589 1590 bridge_enqueue(sc, dst_if, m, 0); 1591 1592 return 0; 1593 } 1594 1595 /* 1596 * bridge_start: 1597 * 1598 * Start output on a bridge. 1599 * 1600 * NOTE: This routine should never be called in this implementation. 1601 */ 1602 static void 1603 bridge_start(struct ifnet *ifp) 1604 { 1605 1606 printf("%s: bridge_start() called\n", ifp->if_xname); 1607 } 1608 1609 /* 1610 * bridge_forward: 1611 * 1612 * The forwarding function of the bridge. 1613 */ 1614 static void 1615 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1616 { 1617 struct bridge_iflist *bif; 1618 struct ifnet *src_if, *dst_if; 1619 struct ether_header *eh; 1620 struct psref psref; 1621 struct psref psref_src; 1622 DECLARE_LOCK_VARIABLE; 1623 1624 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1625 return; 1626 1627 src_if = m_get_rcvif_psref(m, &psref_src); 1628 if (src_if == NULL) { 1629 /* Interface is being destroyed? */ 1630 m_freem(m); 1631 goto out; 1632 } 1633 1634 sc->sc_if.if_ipackets++; 1635 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1636 1637 /* 1638 * Look up the bridge_iflist. 1639 */ 1640 bif = bridge_lookup_member_if(sc, src_if, &psref); 1641 if (bif == NULL) { 1642 /* Interface is not a bridge member (anymore?) */ 1643 m_freem(m); 1644 goto out; 1645 } 1646 1647 if (bif->bif_flags & IFBIF_STP) { 1648 switch (bif->bif_state) { 1649 case BSTP_IFSTATE_BLOCKING: 1650 case BSTP_IFSTATE_LISTENING: 1651 case BSTP_IFSTATE_DISABLED: 1652 m_freem(m); 1653 bridge_release_member(sc, bif, &psref); 1654 goto out; 1655 } 1656 } 1657 1658 eh = mtod(m, struct ether_header *); 1659 1660 /* 1661 * If the interface is learning, and the source 1662 * address is valid and not multicast, record 1663 * the address. 1664 */ 1665 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1666 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1667 (eh->ether_shost[0] == 0 && 1668 eh->ether_shost[1] == 0 && 1669 eh->ether_shost[2] == 0 && 1670 eh->ether_shost[3] == 0 && 1671 eh->ether_shost[4] == 0 && 1672 eh->ether_shost[5] == 0) == 0) { 1673 (void) bridge_rtupdate(sc, eh->ether_shost, 1674 src_if, 0, IFBAF_DYNAMIC); 1675 } 1676 1677 if ((bif->bif_flags & IFBIF_STP) != 0 && 1678 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1679 m_freem(m); 1680 bridge_release_member(sc, bif, &psref); 1681 goto out; 1682 } 1683 1684 bridge_release_member(sc, bif, &psref); 1685 1686 /* 1687 * At this point, the port either doesn't participate 1688 * in spanning tree or it is in the forwarding state. 1689 */ 1690 1691 /* 1692 * If the packet is unicast, destined for someone on 1693 * "this" side of the bridge, drop it. 1694 */ 1695 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1696 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1697 if (src_if == dst_if) { 1698 m_freem(m); 1699 goto out; 1700 } 1701 } else { 1702 /* ...forward it to all interfaces. */ 1703 sc->sc_if.if_imcasts++; 1704 dst_if = NULL; 1705 } 1706 1707 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, src_if, PFIL_IN) != 0) { 1708 if (m != NULL) 1709 m_freem(m); 1710 goto out; 1711 } 1712 if (m == NULL) 1713 goto out; 1714 1715 if (dst_if == NULL) { 1716 bridge_broadcast(sc, src_if, m); 1717 goto out; 1718 } 1719 1720 m_put_rcvif_psref(src_if, &psref_src); 1721 src_if = NULL; 1722 1723 /* 1724 * At this point, we're dealing with a unicast frame 1725 * going to a different interface. 1726 */ 1727 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1728 m_freem(m); 1729 goto out; 1730 } 1731 1732 bif = bridge_lookup_member_if(sc, dst_if, &psref); 1733 if (bif == NULL) { 1734 /* Not a member of the bridge (anymore?) */ 1735 m_freem(m); 1736 goto out; 1737 } 1738 1739 if (bif->bif_flags & IFBIF_STP) { 1740 switch (bif->bif_state) { 1741 case BSTP_IFSTATE_DISABLED: 1742 case BSTP_IFSTATE_BLOCKING: 1743 m_freem(m); 1744 bridge_release_member(sc, bif, &psref); 1745 goto out; 1746 } 1747 } 1748 1749 bridge_release_member(sc, bif, &psref); 1750 1751 ACQUIRE_GLOBAL_LOCKS(); 1752 bridge_enqueue(sc, dst_if, m, 1); 1753 RELEASE_GLOBAL_LOCKS(); 1754 out: 1755 if (src_if != NULL) 1756 m_put_rcvif_psref(src_if, &psref_src); 1757 return; 1758 } 1759 1760 static bool 1761 bstp_state_before_learning(struct bridge_iflist *bif) 1762 { 1763 if (bif->bif_flags & IFBIF_STP) { 1764 switch (bif->bif_state) { 1765 case BSTP_IFSTATE_BLOCKING: 1766 case BSTP_IFSTATE_LISTENING: 1767 case BSTP_IFSTATE_DISABLED: 1768 return true; 1769 } 1770 } 1771 return false; 1772 } 1773 1774 static bool 1775 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1776 { 1777 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1778 1779 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1780 #if NCARP > 0 1781 || (bif->bif_ifp->if_carp && 1782 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1783 #endif /* NCARP > 0 */ 1784 ) 1785 return true; 1786 1787 return false; 1788 } 1789 1790 /* 1791 * bridge_input: 1792 * 1793 * Receive input from a member interface. Queue the packet for 1794 * bridging if it is not for us. 1795 */ 1796 static void 1797 bridge_input(struct ifnet *ifp, struct mbuf *m) 1798 { 1799 struct bridge_softc *sc = ifp->if_bridge; 1800 struct bridge_iflist *bif; 1801 struct ether_header *eh; 1802 struct psref psref; 1803 int bound; 1804 DECLARE_LOCK_VARIABLE; 1805 1806 KASSERT(!cpu_intr_p()); 1807 1808 if (__predict_false(sc == NULL) || 1809 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1810 ACQUIRE_GLOBAL_LOCKS(); 1811 ether_input(ifp, m); 1812 RELEASE_GLOBAL_LOCKS(); 1813 return; 1814 } 1815 1816 bound = curlwp_bind(); 1817 bif = bridge_lookup_member_if(sc, ifp, &psref); 1818 if (bif == NULL) { 1819 curlwp_bindx(bound); 1820 ACQUIRE_GLOBAL_LOCKS(); 1821 ether_input(ifp, m); 1822 RELEASE_GLOBAL_LOCKS(); 1823 return; 1824 } 1825 1826 eh = mtod(m, struct ether_header *); 1827 1828 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1829 if (memcmp(etherbroadcastaddr, 1830 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1831 m->m_flags |= M_BCAST; 1832 else 1833 m->m_flags |= M_MCAST; 1834 } 1835 1836 /* 1837 * A 'fast' path for packets addressed to interfaces that are 1838 * part of this bridge. 1839 */ 1840 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 1841 !bstp_state_before_learning(bif)) { 1842 struct bridge_iflist *_bif; 1843 struct ifnet *_ifp = NULL; 1844 int s; 1845 struct psref _psref; 1846 1847 BRIDGE_PSZ_RENTER(s); 1848 BRIDGE_IFLIST_READER_FOREACH(_bif, sc) { 1849 /* It is destined for us. */ 1850 if (bridge_ourether(_bif, eh, 0)) { 1851 bridge_acquire_member(sc, _bif, &_psref); 1852 BRIDGE_PSZ_REXIT(s); 1853 if (_bif->bif_flags & IFBIF_LEARNING) 1854 (void) bridge_rtupdate(sc, 1855 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1856 m_set_rcvif(m, _bif->bif_ifp); 1857 _ifp = _bif->bif_ifp; 1858 bridge_release_member(sc, _bif, &_psref); 1859 goto out; 1860 } 1861 1862 /* We just received a packet that we sent out. */ 1863 if (bridge_ourether(_bif, eh, 1)) 1864 break; 1865 } 1866 BRIDGE_PSZ_REXIT(s); 1867 out: 1868 1869 if (_bif != NULL) { 1870 bridge_release_member(sc, bif, &psref); 1871 curlwp_bindx(bound); 1872 if (_ifp != NULL) { 1873 m->m_flags &= ~M_PROMISC; 1874 ACQUIRE_GLOBAL_LOCKS(); 1875 ether_input(_ifp, m); 1876 RELEASE_GLOBAL_LOCKS(); 1877 } else 1878 m_freem(m); 1879 return; 1880 } 1881 } 1882 1883 /* Tap off 802.1D packets; they do not get forwarded. */ 1884 if (bif->bif_flags & IFBIF_STP && 1885 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 1886 bstp_input(sc, bif, m); 1887 bridge_release_member(sc, bif, &psref); 1888 curlwp_bindx(bound); 1889 return; 1890 } 1891 1892 /* 1893 * A normal switch would discard the packet here, but that's not what 1894 * we've done historically. This also prevents some obnoxious behaviour. 1895 */ 1896 if (bstp_state_before_learning(bif)) { 1897 bridge_release_member(sc, bif, &psref); 1898 curlwp_bindx(bound); 1899 ACQUIRE_GLOBAL_LOCKS(); 1900 ether_input(ifp, m); 1901 RELEASE_GLOBAL_LOCKS(); 1902 return; 1903 } 1904 1905 bridge_release_member(sc, bif, &psref); 1906 1907 bridge_forward(sc, m); 1908 1909 curlwp_bindx(bound); 1910 } 1911 1912 /* 1913 * bridge_broadcast: 1914 * 1915 * Send a frame to all interfaces that are members of 1916 * the bridge, except for the one on which the packet 1917 * arrived. 1918 */ 1919 static void 1920 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1921 struct mbuf *m) 1922 { 1923 struct bridge_iflist *bif; 1924 struct mbuf *mc; 1925 struct ifnet *dst_if; 1926 bool bmcast; 1927 int s; 1928 DECLARE_LOCK_VARIABLE; 1929 1930 bmcast = m->m_flags & (M_BCAST|M_MCAST); 1931 1932 BRIDGE_PSZ_RENTER(s); 1933 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1934 struct psref psref; 1935 1936 bridge_acquire_member(sc, bif, &psref); 1937 BRIDGE_PSZ_REXIT(s); 1938 1939 dst_if = bif->bif_ifp; 1940 1941 if (bif->bif_flags & IFBIF_STP) { 1942 switch (bif->bif_state) { 1943 case BSTP_IFSTATE_BLOCKING: 1944 case BSTP_IFSTATE_DISABLED: 1945 goto next; 1946 } 1947 } 1948 1949 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 1950 goto next; 1951 1952 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1953 goto next; 1954 1955 if (dst_if != src_if) { 1956 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1957 if (mc == NULL) { 1958 sc->sc_if.if_oerrors++; 1959 goto next; 1960 } 1961 ACQUIRE_GLOBAL_LOCKS(); 1962 bridge_enqueue(sc, dst_if, mc, 1); 1963 RELEASE_GLOBAL_LOCKS(); 1964 } 1965 1966 if (bmcast) { 1967 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1968 if (mc == NULL) { 1969 sc->sc_if.if_oerrors++; 1970 goto next; 1971 } 1972 1973 m_set_rcvif(mc, dst_if); 1974 mc->m_flags &= ~M_PROMISC; 1975 1976 ACQUIRE_GLOBAL_LOCKS(); 1977 ether_input(dst_if, mc); 1978 RELEASE_GLOBAL_LOCKS(); 1979 } 1980 next: 1981 BRIDGE_PSZ_RENTER(s); 1982 bridge_release_member(sc, bif, &psref); 1983 } 1984 BRIDGE_PSZ_REXIT(s); 1985 1986 m_freem(m); 1987 } 1988 1989 static int 1990 bridge_rtalloc(struct bridge_softc *sc, const uint8_t *dst, 1991 struct bridge_rtnode **brtp) 1992 { 1993 struct bridge_rtnode *brt; 1994 int error; 1995 1996 if (sc->sc_brtcnt >= sc->sc_brtmax) 1997 return ENOSPC; 1998 1999 /* 2000 * Allocate a new bridge forwarding node, and 2001 * initialize the expiration time and Ethernet 2002 * address. 2003 */ 2004 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 2005 if (brt == NULL) 2006 return ENOMEM; 2007 2008 memset(brt, 0, sizeof(*brt)); 2009 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2010 brt->brt_flags = IFBAF_DYNAMIC; 2011 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2012 2013 BRIDGE_RT_LOCK(sc); 2014 error = bridge_rtnode_insert(sc, brt); 2015 BRIDGE_RT_UNLOCK(sc); 2016 2017 if (error != 0) { 2018 pool_put(&bridge_rtnode_pool, brt); 2019 return error; 2020 } 2021 2022 *brtp = brt; 2023 return 0; 2024 } 2025 2026 /* 2027 * bridge_rtupdate: 2028 * 2029 * Add a bridge routing entry. 2030 */ 2031 static int 2032 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 2033 struct ifnet *dst_if, int setflags, uint8_t flags) 2034 { 2035 struct bridge_rtnode *brt; 2036 int s; 2037 2038 again: 2039 /* 2040 * A route for this destination might already exist. If so, 2041 * update it, otherwise create a new one. 2042 */ 2043 BRIDGE_RT_RENTER(s); 2044 brt = bridge_rtnode_lookup(sc, dst); 2045 2046 if (brt != NULL) { 2047 brt->brt_ifp = dst_if; 2048 if (setflags) { 2049 brt->brt_flags = flags; 2050 if (flags & IFBAF_STATIC) 2051 brt->brt_expire = 0; 2052 else 2053 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2054 } else { 2055 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2056 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2057 } 2058 } 2059 BRIDGE_RT_REXIT(s); 2060 2061 if (brt == NULL) { 2062 int r; 2063 2064 r = bridge_rtalloc(sc, dst, &brt); 2065 if (r != 0) 2066 return r; 2067 goto again; 2068 } 2069 2070 return 0; 2071 } 2072 2073 /* 2074 * bridge_rtlookup: 2075 * 2076 * Lookup the destination interface for an address. 2077 */ 2078 static struct ifnet * 2079 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2080 { 2081 struct bridge_rtnode *brt; 2082 struct ifnet *ifs = NULL; 2083 int s; 2084 2085 BRIDGE_RT_RENTER(s); 2086 brt = bridge_rtnode_lookup(sc, addr); 2087 if (brt != NULL) 2088 ifs = brt->brt_ifp; 2089 BRIDGE_RT_REXIT(s); 2090 2091 return ifs; 2092 } 2093 2094 typedef bool (*bridge_iterate_cb_t) 2095 (struct bridge_softc *, struct bridge_rtnode *, bool *, void *); 2096 2097 /* 2098 * bridge_rtlist_iterate_remove: 2099 * 2100 * It iterates on sc->sc_rtlist and removes rtnodes of it which func 2101 * callback judges to remove. Removals of rtnodes are done in a manner 2102 * of pserialize. To this end, all kmem_* operations are placed out of 2103 * mutexes. 2104 */ 2105 static void 2106 bridge_rtlist_iterate_remove(struct bridge_softc *sc, bridge_iterate_cb_t func, void *arg) 2107 { 2108 struct bridge_rtnode *brt, *nbrt; 2109 struct bridge_rtnode **brt_list; 2110 int i, count; 2111 2112 retry: 2113 count = sc->sc_brtcnt; 2114 if (count == 0) 2115 return; 2116 brt_list = kmem_alloc(sizeof(*brt_list) * count, KM_SLEEP); 2117 2118 BRIDGE_RT_LOCK(sc); 2119 if (__predict_false(sc->sc_brtcnt > count)) { 2120 /* The rtnodes increased, we need more memory */ 2121 BRIDGE_RT_UNLOCK(sc); 2122 kmem_free(brt_list, sizeof(*brt_list) * count); 2123 goto retry; 2124 } 2125 2126 i = 0; 2127 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2128 bool need_break = false; 2129 if (func(sc, brt, &need_break, arg)) { 2130 bridge_rtnode_remove(sc, brt); 2131 brt_list[i++] = brt; 2132 } 2133 if (need_break) 2134 break; 2135 } 2136 2137 if (i > 0) 2138 BRIDGE_RT_PSZ_PERFORM(sc); 2139 BRIDGE_RT_UNLOCK(sc); 2140 2141 while (--i >= 0) 2142 bridge_rtnode_destroy(brt_list[i]); 2143 2144 kmem_free(brt_list, sizeof(*brt_list) * count); 2145 } 2146 2147 static bool 2148 bridge_rttrim0_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2149 bool *need_break, void *arg) 2150 { 2151 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2152 /* Take into account of the subsequent removal */ 2153 if ((sc->sc_brtcnt - 1) <= sc->sc_brtmax) 2154 *need_break = true; 2155 return true; 2156 } else 2157 return false; 2158 } 2159 2160 static void 2161 bridge_rttrim0(struct bridge_softc *sc) 2162 { 2163 bridge_rtlist_iterate_remove(sc, bridge_rttrim0_cb, NULL); 2164 } 2165 2166 /* 2167 * bridge_rttrim: 2168 * 2169 * Trim the routine table so that we have a number 2170 * of routing entries less than or equal to the 2171 * maximum number. 2172 */ 2173 static void 2174 bridge_rttrim(struct bridge_softc *sc) 2175 { 2176 2177 /* Make sure we actually need to do this. */ 2178 if (sc->sc_brtcnt <= sc->sc_brtmax) 2179 return; 2180 2181 /* Force an aging cycle; this might trim enough addresses. */ 2182 bridge_rtage(sc); 2183 if (sc->sc_brtcnt <= sc->sc_brtmax) 2184 return; 2185 2186 bridge_rttrim0(sc); 2187 2188 return; 2189 } 2190 2191 /* 2192 * bridge_timer: 2193 * 2194 * Aging timer for the bridge. 2195 */ 2196 static void 2197 bridge_timer(void *arg) 2198 { 2199 struct bridge_softc *sc = arg; 2200 2201 workqueue_enqueue(sc->sc_rtage_wq, &sc->sc_rtage_wk, NULL); 2202 } 2203 2204 static void 2205 bridge_rtage_work(struct work *wk, void *arg) 2206 { 2207 struct bridge_softc *sc = arg; 2208 2209 KASSERT(wk == &sc->sc_rtage_wk); 2210 2211 bridge_rtage(sc); 2212 2213 if (sc->sc_if.if_flags & IFF_RUNNING) 2214 callout_reset(&sc->sc_brcallout, 2215 bridge_rtable_prune_period * hz, bridge_timer, sc); 2216 } 2217 2218 static bool 2219 bridge_rtage_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2220 bool *need_break, void *arg) 2221 { 2222 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2223 time_uptime >= brt->brt_expire) 2224 return true; 2225 else 2226 return false; 2227 } 2228 2229 /* 2230 * bridge_rtage: 2231 * 2232 * Perform an aging cycle. 2233 */ 2234 static void 2235 bridge_rtage(struct bridge_softc *sc) 2236 { 2237 bridge_rtlist_iterate_remove(sc, bridge_rtage_cb, NULL); 2238 } 2239 2240 2241 static bool 2242 bridge_rtflush_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2243 bool *need_break, void *arg) 2244 { 2245 int full = *(int*)arg; 2246 2247 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2248 return true; 2249 else 2250 return false; 2251 } 2252 2253 /* 2254 * bridge_rtflush: 2255 * 2256 * Remove all dynamic addresses from the bridge. 2257 */ 2258 static void 2259 bridge_rtflush(struct bridge_softc *sc, int full) 2260 { 2261 bridge_rtlist_iterate_remove(sc, bridge_rtflush_cb, &full); 2262 } 2263 2264 /* 2265 * bridge_rtdaddr: 2266 * 2267 * Remove an address from the table. 2268 */ 2269 static int 2270 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2271 { 2272 struct bridge_rtnode *brt; 2273 2274 BRIDGE_RT_LOCK(sc); 2275 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2276 BRIDGE_RT_UNLOCK(sc); 2277 return ENOENT; 2278 } 2279 bridge_rtnode_remove(sc, brt); 2280 BRIDGE_RT_PSZ_PERFORM(sc); 2281 BRIDGE_RT_UNLOCK(sc); 2282 2283 bridge_rtnode_destroy(brt); 2284 2285 return 0; 2286 } 2287 2288 /* 2289 * bridge_rtdelete: 2290 * 2291 * Delete routes to a speicifc member interface. 2292 */ 2293 static void 2294 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2295 { 2296 struct bridge_rtnode *brt; 2297 2298 /* XXX pserialize_perform for each entry is slow */ 2299 again: 2300 BRIDGE_RT_LOCK(sc); 2301 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2302 if (brt->brt_ifp == ifp) 2303 break; 2304 } 2305 if (brt == NULL) { 2306 BRIDGE_RT_UNLOCK(sc); 2307 return; 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 goto again; 2316 } 2317 2318 /* 2319 * bridge_rtable_init: 2320 * 2321 * Initialize the route table for this bridge. 2322 */ 2323 static void 2324 bridge_rtable_init(struct bridge_softc *sc) 2325 { 2326 int i; 2327 2328 sc->sc_rthash = kmem_alloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2329 KM_SLEEP); 2330 2331 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2332 LIST_INIT(&sc->sc_rthash[i]); 2333 2334 sc->sc_rthash_key = cprng_fast32(); 2335 2336 LIST_INIT(&sc->sc_rtlist); 2337 2338 sc->sc_rtlist_psz = pserialize_create(); 2339 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 2340 } 2341 2342 /* 2343 * bridge_rtable_fini: 2344 * 2345 * Deconstruct the route table for this bridge. 2346 */ 2347 static void 2348 bridge_rtable_fini(struct bridge_softc *sc) 2349 { 2350 2351 kmem_free(sc->sc_rthash, sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE); 2352 mutex_obj_free(sc->sc_rtlist_lock); 2353 pserialize_destroy(sc->sc_rtlist_psz); 2354 } 2355 2356 /* 2357 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2358 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2359 */ 2360 #define mix(a, b, c) \ 2361 do { \ 2362 a -= b; a -= c; a ^= (c >> 13); \ 2363 b -= c; b -= a; b ^= (a << 8); \ 2364 c -= a; c -= b; c ^= (b >> 13); \ 2365 a -= b; a -= c; a ^= (c >> 12); \ 2366 b -= c; b -= a; b ^= (a << 16); \ 2367 c -= a; c -= b; c ^= (b >> 5); \ 2368 a -= b; a -= c; a ^= (c >> 3); \ 2369 b -= c; b -= a; b ^= (a << 10); \ 2370 c -= a; c -= b; c ^= (b >> 15); \ 2371 } while (/*CONSTCOND*/0) 2372 2373 static inline uint32_t 2374 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2375 { 2376 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2377 2378 b += addr[5] << 8; 2379 b += addr[4]; 2380 a += addr[3] << 24; 2381 a += addr[2] << 16; 2382 a += addr[1] << 8; 2383 a += addr[0]; 2384 2385 mix(a, b, c); 2386 2387 return (c & BRIDGE_RTHASH_MASK); 2388 } 2389 2390 #undef mix 2391 2392 /* 2393 * bridge_rtnode_lookup: 2394 * 2395 * Look up a bridge route node for the specified destination. 2396 */ 2397 static struct bridge_rtnode * 2398 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2399 { 2400 struct bridge_rtnode *brt; 2401 uint32_t hash; 2402 int dir; 2403 2404 hash = bridge_rthash(sc, addr); 2405 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2406 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2407 if (dir == 0) 2408 return brt; 2409 if (dir > 0) 2410 return NULL; 2411 } 2412 2413 return NULL; 2414 } 2415 2416 /* 2417 * bridge_rtnode_insert: 2418 * 2419 * Insert the specified bridge node into the route table. We 2420 * assume the entry is not already in the table. 2421 */ 2422 static int 2423 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2424 { 2425 struct bridge_rtnode *lbrt; 2426 uint32_t hash; 2427 int dir; 2428 2429 KASSERT(BRIDGE_RT_LOCKED(sc)); 2430 2431 hash = bridge_rthash(sc, brt->brt_addr); 2432 2433 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2434 if (lbrt == NULL) { 2435 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2436 goto out; 2437 } 2438 2439 do { 2440 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2441 if (dir == 0) 2442 return EEXIST; 2443 if (dir > 0) { 2444 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2445 goto out; 2446 } 2447 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2448 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2449 goto out; 2450 } 2451 lbrt = LIST_NEXT(lbrt, brt_hash); 2452 } while (lbrt != NULL); 2453 2454 #ifdef DIAGNOSTIC 2455 panic("bridge_rtnode_insert: impossible"); 2456 #endif 2457 2458 out: 2459 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2460 sc->sc_brtcnt++; 2461 2462 return 0; 2463 } 2464 2465 /* 2466 * bridge_rtnode_remove: 2467 * 2468 * Remove a bridge rtnode from the rthash and the rtlist of a bridge. 2469 */ 2470 static void 2471 bridge_rtnode_remove(struct bridge_softc *sc, struct bridge_rtnode *brt) 2472 { 2473 2474 KASSERT(BRIDGE_RT_LOCKED(sc)); 2475 2476 LIST_REMOVE(brt, brt_hash); 2477 LIST_REMOVE(brt, brt_list); 2478 sc->sc_brtcnt--; 2479 } 2480 2481 /* 2482 * bridge_rtnode_destroy: 2483 * 2484 * Destroy a bridge rtnode. 2485 */ 2486 static void 2487 bridge_rtnode_destroy(struct bridge_rtnode *brt) 2488 { 2489 2490 pool_put(&bridge_rtnode_pool, brt); 2491 } 2492 2493 #if defined(BRIDGE_IPF) 2494 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2495 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2496 2497 /* 2498 * Send bridge packets through IPF if they are one of the types IPF can deal 2499 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2500 * question.) 2501 */ 2502 static int 2503 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2504 { 2505 int snap, error; 2506 struct ether_header *eh1, eh2; 2507 struct llc llc1; 2508 uint16_t ether_type; 2509 2510 snap = 0; 2511 error = -1; /* Default error if not error == 0 */ 2512 eh1 = mtod(*mp, struct ether_header *); 2513 ether_type = ntohs(eh1->ether_type); 2514 2515 /* 2516 * Check for SNAP/LLC. 2517 */ 2518 if (ether_type < ETHERMTU) { 2519 struct llc *llc2 = (struct llc *)(eh1 + 1); 2520 2521 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2522 llc2->llc_dsap == LLC_SNAP_LSAP && 2523 llc2->llc_ssap == LLC_SNAP_LSAP && 2524 llc2->llc_control == LLC_UI) { 2525 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2526 snap = 1; 2527 } 2528 } 2529 2530 /* 2531 * If we're trying to filter bridge traffic, don't look at anything 2532 * other than IP and ARP traffic. If the filter doesn't understand 2533 * IPv6, don't allow IPv6 through the bridge either. This is lame 2534 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2535 * but of course we don't have an AppleTalk filter to begin with. 2536 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2537 * ARP traffic.) 2538 */ 2539 switch (ether_type) { 2540 case ETHERTYPE_ARP: 2541 case ETHERTYPE_REVARP: 2542 return 0; /* Automatically pass */ 2543 case ETHERTYPE_IP: 2544 # ifdef INET6 2545 case ETHERTYPE_IPV6: 2546 # endif /* INET6 */ 2547 break; 2548 default: 2549 goto bad; 2550 } 2551 2552 /* Strip off the Ethernet header and keep a copy. */ 2553 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2554 m_adj(*mp, ETHER_HDR_LEN); 2555 2556 /* Strip off snap header, if present */ 2557 if (snap) { 2558 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2559 m_adj(*mp, sizeof(struct llc)); 2560 } 2561 2562 /* 2563 * Check basic packet sanity and run IPF through pfil. 2564 */ 2565 KASSERT(!cpu_intr_p()); 2566 switch (ether_type) 2567 { 2568 case ETHERTYPE_IP : 2569 error = bridge_ip_checkbasic(mp); 2570 if (error == 0) 2571 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2572 break; 2573 # ifdef INET6 2574 case ETHERTYPE_IPV6 : 2575 error = bridge_ip6_checkbasic(mp); 2576 if (error == 0) 2577 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2578 break; 2579 # endif 2580 default : 2581 error = 0; 2582 break; 2583 } 2584 2585 if (*mp == NULL) 2586 return error; 2587 if (error != 0) 2588 goto bad; 2589 2590 error = -1; 2591 2592 /* 2593 * Finally, put everything back the way it was and return 2594 */ 2595 if (snap) { 2596 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2597 if (*mp == NULL) 2598 return error; 2599 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2600 } 2601 2602 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2603 if (*mp == NULL) 2604 return error; 2605 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2606 2607 return 0; 2608 2609 bad: 2610 m_freem(*mp); 2611 *mp = NULL; 2612 return error; 2613 } 2614 2615 /* 2616 * Perform basic checks on header size since 2617 * IPF assumes ip_input has already processed 2618 * it for it. Cut-and-pasted from ip_input.c. 2619 * Given how simple the IPv6 version is, 2620 * does the IPv4 version really need to be 2621 * this complicated? 2622 * 2623 * XXX Should we update ipstat here, or not? 2624 * XXX Right now we update ipstat but not 2625 * XXX csum_counter. 2626 */ 2627 static int 2628 bridge_ip_checkbasic(struct mbuf **mp) 2629 { 2630 struct mbuf *m = *mp; 2631 struct ip *ip; 2632 int len, hlen; 2633 2634 if (*mp == NULL) 2635 return -1; 2636 2637 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2638 if ((m = m_copyup(m, sizeof(struct ip), 2639 (max_linkhdr + 3) & ~3)) == NULL) { 2640 /* XXXJRT new stat, please */ 2641 ip_statinc(IP_STAT_TOOSMALL); 2642 goto bad; 2643 } 2644 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2645 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2646 ip_statinc(IP_STAT_TOOSMALL); 2647 goto bad; 2648 } 2649 } 2650 ip = mtod(m, struct ip *); 2651 if (ip == NULL) goto bad; 2652 2653 if (ip->ip_v != IPVERSION) { 2654 ip_statinc(IP_STAT_BADVERS); 2655 goto bad; 2656 } 2657 hlen = ip->ip_hl << 2; 2658 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2659 ip_statinc(IP_STAT_BADHLEN); 2660 goto bad; 2661 } 2662 if (hlen > m->m_len) { 2663 if ((m = m_pullup(m, hlen)) == 0) { 2664 ip_statinc(IP_STAT_BADHLEN); 2665 goto bad; 2666 } 2667 ip = mtod(m, struct ip *); 2668 if (ip == NULL) goto bad; 2669 } 2670 2671 switch (m->m_pkthdr.csum_flags & 2672 ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_IPv4) | 2673 M_CSUM_IPv4_BAD)) { 2674 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2675 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2676 goto bad; 2677 2678 case M_CSUM_IPv4: 2679 /* Checksum was okay. */ 2680 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2681 break; 2682 2683 default: 2684 /* Must compute it ourselves. */ 2685 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2686 if (in_cksum(m, hlen) != 0) 2687 goto bad; 2688 break; 2689 } 2690 2691 /* Retrieve the packet length. */ 2692 len = ntohs(ip->ip_len); 2693 2694 /* 2695 * Check for additional length bogosity 2696 */ 2697 if (len < hlen) { 2698 ip_statinc(IP_STAT_BADLEN); 2699 goto bad; 2700 } 2701 2702 /* 2703 * Check that the amount of data in the buffers 2704 * is as at least much as the IP header would have us expect. 2705 * Drop packet if shorter than we expect. 2706 */ 2707 if (m->m_pkthdr.len < len) { 2708 ip_statinc(IP_STAT_TOOSHORT); 2709 goto bad; 2710 } 2711 2712 /* Checks out, proceed */ 2713 *mp = m; 2714 return 0; 2715 2716 bad: 2717 *mp = m; 2718 return -1; 2719 } 2720 2721 # ifdef INET6 2722 /* 2723 * Same as above, but for IPv6. 2724 * Cut-and-pasted from ip6_input.c. 2725 * XXX Should we update ip6stat, or not? 2726 */ 2727 static int 2728 bridge_ip6_checkbasic(struct mbuf **mp) 2729 { 2730 struct mbuf *m = *mp; 2731 struct ip6_hdr *ip6; 2732 2733 /* 2734 * If the IPv6 header is not aligned, slurp it up into a new 2735 * mbuf with space for link headers, in the event we forward 2736 * it. Otherwise, if it is aligned, make sure the entire base 2737 * IPv6 header is in the first mbuf of the chain. 2738 */ 2739 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2740 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2741 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2742 (max_linkhdr + 3) & ~3)) == NULL) { 2743 /* XXXJRT new stat, please */ 2744 ip6_statinc(IP6_STAT_TOOSMALL); 2745 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2746 goto bad; 2747 } 2748 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2749 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2750 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2751 ip6_statinc(IP6_STAT_TOOSMALL); 2752 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2753 goto bad; 2754 } 2755 } 2756 2757 ip6 = mtod(m, struct ip6_hdr *); 2758 2759 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2760 ip6_statinc(IP6_STAT_BADVERS); 2761 in6_ifstat_inc(m_get_rcvif_NOMPSAFE(m), ifs6_in_hdrerr); 2762 goto bad; 2763 } 2764 2765 /* Checks out, proceed */ 2766 *mp = m; 2767 return 0; 2768 2769 bad: 2770 *mp = m; 2771 return -1; 2772 } 2773 # endif /* INET6 */ 2774 #endif /* BRIDGE_IPF */ 2775
Indexes created Tue Sep 23 22:09:46 GMT 2025