if_bridge.c revision 1.146
1 /* $NetBSD: if_bridge.c,v 1.146 2017/12/19 03:32:35 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 1.146 2017/12/19 03:32:35 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 bridge_stop(ifp, 1); 473 474 BRIDGE_LOCK(sc); 475 for (;;) { 476 bif = PSLIST_WRITER_FIRST(&sc->sc_iflist_psref.bip_iflist, struct bridge_iflist, 477 bif_next); 478 if (bif == NULL) 479 break; 480 bridge_delete_member(sc, bif); 481 } 482 PSLIST_DESTROY(&sc->sc_iflist_psref.bip_iflist); 483 BRIDGE_UNLOCK(sc); 484 485 if_detach(ifp); 486 487 /* Tear down the routing table. */ 488 bridge_rtable_fini(sc); 489 490 pserialize_destroy(sc->sc_iflist_psref.bip_psz); 491 mutex_destroy(&sc->sc_iflist_psref.bip_lock); 492 callout_destroy(&sc->sc_brcallout); 493 callout_destroy(&sc->sc_bstpcallout); 494 workqueue_destroy(sc->sc_rtage_wq); 495 kmem_free(sc, sizeof(*sc)); 496 497 return 0; 498 } 499 500 /* 501 * bridge_ioctl: 502 * 503 * Handle a control request from the operator. 504 */ 505 static int 506 bridge_ioctl(struct ifnet *ifp, u_long cmd, void *data) 507 { 508 struct bridge_softc *sc = ifp->if_softc; 509 struct lwp *l = curlwp; /* XXX */ 510 union { 511 struct ifbreq ifbreq; 512 struct ifbifconf ifbifconf; 513 struct ifbareq ifbareq; 514 struct ifbaconf ifbaconf; 515 struct ifbrparam ifbrparam; 516 } args; 517 struct ifdrv *ifd = (struct ifdrv *) data; 518 const struct bridge_control *bc = NULL; /* XXXGCC */ 519 int s, error = 0; 520 521 /* Authorize command before calling splsoftnet(). */ 522 switch (cmd) { 523 case SIOCGDRVSPEC: 524 case SIOCSDRVSPEC: 525 if (ifd->ifd_cmd >= bridge_control_table_size 526 || (bc = &bridge_control_table[ifd->ifd_cmd]) == NULL) { 527 error = EINVAL; 528 return error; 529 } 530 531 /* We only care about BC_F_SUSER at this point. */ 532 if ((bc->bc_flags & BC_F_SUSER) == 0) 533 break; 534 535 error = kauth_authorize_network(l->l_cred, 536 KAUTH_NETWORK_INTERFACE_BRIDGE, 537 cmd == SIOCGDRVSPEC ? 538 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_GETPRIV : 539 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_SETPRIV, 540 ifd, NULL, NULL); 541 if (error) 542 return error; 543 544 break; 545 } 546 547 s = splsoftnet(); 548 549 switch (cmd) { 550 case SIOCGDRVSPEC: 551 case SIOCSDRVSPEC: 552 KASSERT(bc != NULL); 553 if (cmd == SIOCGDRVSPEC && 554 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) == 0) { 555 error = EINVAL; 556 break; 557 } 558 else if (cmd == SIOCSDRVSPEC && 559 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) != 0) { 560 error = EINVAL; 561 break; 562 } 563 564 /* BC_F_SUSER is checked above, before splsoftnet(). */ 565 566 if ((bc->bc_flags & (BC_F_XLATEIN|BC_F_XLATEOUT)) == 0 567 && (ifd->ifd_len != bc->bc_argsize 568 || ifd->ifd_len > sizeof(args))) { 569 error = EINVAL; 570 break; 571 } 572 573 memset(&args, 0, sizeof(args)); 574 if (bc->bc_flags & BC_F_COPYIN) { 575 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 576 if (error) 577 break; 578 } else if (bc->bc_flags & BC_F_XLATEIN) { 579 args.ifbifconf.ifbic_len = ifd->ifd_len; 580 args.ifbifconf.ifbic_buf = ifd->ifd_data; 581 } 582 583 error = (*bc->bc_func)(sc, &args); 584 if (error) 585 break; 586 587 if (bc->bc_flags & BC_F_COPYOUT) { 588 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 589 } else if (bc->bc_flags & BC_F_XLATEOUT) { 590 ifd->ifd_len = args.ifbifconf.ifbic_len; 591 ifd->ifd_data = args.ifbifconf.ifbic_buf; 592 } 593 break; 594 595 case SIOCSIFFLAGS: 596 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 597 break; 598 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 599 case IFF_RUNNING: 600 /* 601 * If interface is marked down and it is running, 602 * then stop and disable it. 603 */ 604 (*ifp->if_stop)(ifp, 1); 605 break; 606 case IFF_UP: 607 /* 608 * If interface is marked up and it is stopped, then 609 * start it. 610 */ 611 error = (*ifp->if_init)(ifp); 612 break; 613 default: 614 break; 615 } 616 break; 617 618 case SIOCSIFMTU: 619 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 620 error = 0; 621 break; 622 623 default: 624 error = ifioctl_common(ifp, cmd, data); 625 break; 626 } 627 628 splx(s); 629 630 return error; 631 } 632 633 /* 634 * bridge_lookup_member: 635 * 636 * Lookup a bridge member interface. 637 */ 638 static struct bridge_iflist * 639 bridge_lookup_member(struct bridge_softc *sc, const char *name, struct psref *psref) 640 { 641 struct bridge_iflist *bif; 642 struct ifnet *ifp; 643 int s; 644 645 BRIDGE_PSZ_RENTER(s); 646 647 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 648 ifp = bif->bif_ifp; 649 if (strcmp(ifp->if_xname, name) == 0) 650 break; 651 } 652 if (bif != NULL) 653 bridge_acquire_member(sc, bif, psref); 654 655 BRIDGE_PSZ_REXIT(s); 656 657 return bif; 658 } 659 660 /* 661 * bridge_lookup_member_if: 662 * 663 * Lookup a bridge member interface by ifnet*. 664 */ 665 static struct bridge_iflist * 666 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp, 667 struct psref *psref) 668 { 669 struct bridge_iflist *bif; 670 int s; 671 672 BRIDGE_PSZ_RENTER(s); 673 674 bif = member_ifp->if_bridgeif; 675 if (bif != NULL) { 676 psref_acquire(psref, &bif->bif_psref, 677 bridge_psref_class); 678 } 679 680 BRIDGE_PSZ_REXIT(s); 681 682 return bif; 683 } 684 685 static void 686 bridge_acquire_member(struct bridge_softc *sc, struct bridge_iflist *bif, 687 struct psref *psref) 688 { 689 690 psref_acquire(psref, &bif->bif_psref, bridge_psref_class); 691 } 692 693 /* 694 * bridge_release_member: 695 * 696 * Release the specified member interface. 697 */ 698 static void 699 bridge_release_member(struct bridge_softc *sc, struct bridge_iflist *bif, 700 struct psref *psref) 701 { 702 703 psref_release(psref, &bif->bif_psref, bridge_psref_class); 704 } 705 706 /* 707 * bridge_delete_member: 708 * 709 * Delete the specified member interface. 710 */ 711 static void 712 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 713 { 714 struct ifnet *ifs = bif->bif_ifp; 715 716 KASSERT(BRIDGE_LOCKED(sc)); 717 718 ifs->_if_input = ether_input; 719 ifs->if_bridge = NULL; 720 ifs->if_bridgeif = NULL; 721 722 PSLIST_WRITER_REMOVE(bif, bif_next); 723 BRIDGE_PSZ_PERFORM(sc); 724 BRIDGE_UNLOCK(sc); 725 726 psref_target_destroy(&bif->bif_psref, bridge_psref_class); 727 728 PSLIST_ENTRY_DESTROY(bif, bif_next); 729 kmem_free(bif, sizeof(*bif)); 730 731 BRIDGE_LOCK(sc); 732 } 733 734 static int 735 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 736 { 737 struct ifbreq *req = arg; 738 struct bridge_iflist *bif = NULL; 739 struct ifnet *ifs; 740 int error = 0; 741 struct psref psref; 742 743 ifs = if_get(req->ifbr_ifsname, &psref); 744 if (ifs == NULL) 745 return ENOENT; 746 747 if (ifs->if_bridge == sc) { 748 error = EEXIST; 749 goto out; 750 } 751 752 if (ifs->if_bridge != NULL) { 753 error = EBUSY; 754 goto out; 755 } 756 757 if (ifs->_if_input != ether_input) { 758 error = EINVAL; 759 goto out; 760 } 761 762 /* FIXME: doesn't work with non-IFF_SIMPLEX interfaces */ 763 if ((ifs->if_flags & IFF_SIMPLEX) == 0) { 764 error = EINVAL; 765 goto out; 766 } 767 768 bif = kmem_alloc(sizeof(*bif), KM_SLEEP); 769 770 switch (ifs->if_type) { 771 case IFT_ETHER: 772 if (sc->sc_if.if_mtu != ifs->if_mtu) { 773 error = EINVAL; 774 goto out; 775 } 776 /* FALLTHROUGH */ 777 case IFT_L2TP: 778 IFNET_LOCK(ifs); 779 error = ether_enable_vlan_mtu(ifs); 780 IFNET_UNLOCK(ifs); 781 if (error > 0) 782 goto out; 783 /* 784 * Place the interface into promiscuous mode. 785 */ 786 error = ifpromisc(ifs, 1); 787 if (error) 788 goto out; 789 break; 790 default: 791 error = EINVAL; 792 goto out; 793 } 794 795 bif->bif_ifp = ifs; 796 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 797 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 798 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 799 PSLIST_ENTRY_INIT(bif, bif_next); 800 psref_target_init(&bif->bif_psref, bridge_psref_class); 801 802 BRIDGE_LOCK(sc); 803 804 ifs->if_bridge = sc; 805 ifs->if_bridgeif = bif; 806 PSLIST_WRITER_INSERT_HEAD(&sc->sc_iflist_psref.bip_iflist, bif, bif_next); 807 ifs->_if_input = bridge_input; 808 809 BRIDGE_UNLOCK(sc); 810 811 if (sc->sc_if.if_flags & IFF_RUNNING) 812 bstp_initialization(sc); 813 else 814 bstp_stop(sc); 815 816 out: 817 if_put(ifs, &psref); 818 if (error) { 819 if (bif != NULL) 820 kmem_free(bif, sizeof(*bif)); 821 } 822 return error; 823 } 824 825 static int 826 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 827 { 828 struct ifbreq *req = arg; 829 const char *name = req->ifbr_ifsname; 830 struct bridge_iflist *bif; 831 struct ifnet *ifs; 832 833 BRIDGE_LOCK(sc); 834 835 /* 836 * Don't use bridge_lookup_member. We want to get a member 837 * with bif_refs == 0. 838 */ 839 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 840 ifs = bif->bif_ifp; 841 if (strcmp(ifs->if_xname, name) == 0) 842 break; 843 } 844 845 if (bif == NULL) { 846 BRIDGE_UNLOCK(sc); 847 return ENOENT; 848 } 849 850 bridge_delete_member(sc, bif); 851 852 BRIDGE_UNLOCK(sc); 853 854 switch (ifs->if_type) { 855 case IFT_ETHER: 856 case IFT_L2TP: 857 /* 858 * Take the interface out of promiscuous mode. 859 * Don't call it with holding a spin lock. 860 */ 861 (void) ifpromisc(ifs, 0); 862 IFNET_LOCK(ifs); 863 (void) ether_disable_vlan_mtu(ifs); 864 IFNET_UNLOCK(ifs); 865 break; 866 default: 867 #ifdef DIAGNOSTIC 868 panic("bridge_delete_member: impossible"); 869 #endif 870 break; 871 } 872 873 bridge_rtdelete(sc, ifs); 874 875 if (sc->sc_if.if_flags & IFF_RUNNING) 876 bstp_initialization(sc); 877 878 return 0; 879 } 880 881 static int 882 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 883 { 884 struct ifbreq *req = arg; 885 struct bridge_iflist *bif; 886 struct psref psref; 887 888 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 889 if (bif == NULL) 890 return ENOENT; 891 892 req->ifbr_ifsflags = bif->bif_flags; 893 req->ifbr_state = bif->bif_state; 894 req->ifbr_priority = bif->bif_priority; 895 req->ifbr_path_cost = bif->bif_path_cost; 896 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 897 898 bridge_release_member(sc, bif, &psref); 899 900 return 0; 901 } 902 903 static int 904 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 905 { 906 struct ifbreq *req = arg; 907 struct bridge_iflist *bif; 908 struct psref psref; 909 910 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 911 if (bif == NULL) 912 return ENOENT; 913 914 if (req->ifbr_ifsflags & IFBIF_STP) { 915 switch (bif->bif_ifp->if_type) { 916 case IFT_ETHER: 917 case IFT_L2TP: 918 /* These can do spanning tree. */ 919 break; 920 921 default: 922 /* Nothing else can. */ 923 bridge_release_member(sc, bif, &psref); 924 return EINVAL; 925 } 926 } 927 928 bif->bif_flags = req->ifbr_ifsflags; 929 930 bridge_release_member(sc, bif, &psref); 931 932 if (sc->sc_if.if_flags & IFF_RUNNING) 933 bstp_initialization(sc); 934 935 return 0; 936 } 937 938 static int 939 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 940 { 941 struct ifbrparam *param = arg; 942 943 sc->sc_brtmax = param->ifbrp_csize; 944 bridge_rttrim(sc); 945 946 return 0; 947 } 948 949 static int 950 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 951 { 952 struct ifbrparam *param = arg; 953 954 param->ifbrp_csize = sc->sc_brtmax; 955 956 return 0; 957 } 958 959 static int 960 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 961 { 962 struct ifbifconf *bifc = arg; 963 struct bridge_iflist *bif; 964 struct ifbreq *breqs; 965 int i, count, error = 0; 966 967 retry: 968 BRIDGE_LOCK(sc); 969 count = 0; 970 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 971 count++; 972 BRIDGE_UNLOCK(sc); 973 974 if (count == 0) { 975 bifc->ifbic_len = 0; 976 return 0; 977 } 978 979 if (bifc->ifbic_len == 0 || bifc->ifbic_len < (sizeof(*breqs) * count)) { 980 /* Tell that a larger buffer is needed */ 981 bifc->ifbic_len = sizeof(*breqs) * count; 982 return 0; 983 } 984 985 breqs = kmem_alloc(sizeof(*breqs) * count, KM_SLEEP); 986 987 BRIDGE_LOCK(sc); 988 989 i = 0; 990 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 991 i++; 992 if (i > count) { 993 /* 994 * The number of members has been increased. 995 * We need more memory! 996 */ 997 BRIDGE_UNLOCK(sc); 998 kmem_free(breqs, sizeof(*breqs) * count); 999 goto retry; 1000 } 1001 1002 i = 0; 1003 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 1004 struct ifbreq *breq = &breqs[i++]; 1005 memset(breq, 0, sizeof(*breq)); 1006 1007 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, 1008 sizeof(breq->ifbr_ifsname)); 1009 breq->ifbr_ifsflags = bif->bif_flags; 1010 breq->ifbr_state = bif->bif_state; 1011 breq->ifbr_priority = bif->bif_priority; 1012 breq->ifbr_path_cost = bif->bif_path_cost; 1013 breq->ifbr_portno = bif->bif_ifp->if_index & 0xff; 1014 } 1015 1016 /* Don't call copyout with holding the mutex */ 1017 BRIDGE_UNLOCK(sc); 1018 1019 for (i = 0; i < count; i++) { 1020 error = copyout(&breqs[i], bifc->ifbic_req + i, sizeof(*breqs)); 1021 if (error) 1022 break; 1023 } 1024 bifc->ifbic_len = sizeof(*breqs) * i; 1025 1026 kmem_free(breqs, sizeof(*breqs) * count); 1027 1028 return error; 1029 } 1030 1031 static int 1032 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1033 { 1034 struct ifbaconf *bac = arg; 1035 struct bridge_rtnode *brt; 1036 struct ifbareq bareq; 1037 int count = 0, error = 0, len; 1038 1039 if (bac->ifbac_len == 0) 1040 return 0; 1041 1042 BRIDGE_RT_LOCK(sc); 1043 1044 len = bac->ifbac_len; 1045 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1046 if (len < sizeof(bareq)) 1047 goto out; 1048 memset(&bareq, 0, sizeof(bareq)); 1049 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1050 sizeof(bareq.ifba_ifsname)); 1051 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1052 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1053 bareq.ifba_expire = brt->brt_expire - time_uptime; 1054 } else 1055 bareq.ifba_expire = 0; 1056 bareq.ifba_flags = brt->brt_flags; 1057 1058 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1059 if (error) 1060 goto out; 1061 count++; 1062 len -= sizeof(bareq); 1063 } 1064 out: 1065 BRIDGE_RT_UNLOCK(sc); 1066 1067 bac->ifbac_len = sizeof(bareq) * count; 1068 return error; 1069 } 1070 1071 static int 1072 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1073 { 1074 struct ifbareq *req = arg; 1075 struct bridge_iflist *bif; 1076 int error; 1077 struct psref psref; 1078 1079 bif = bridge_lookup_member(sc, req->ifba_ifsname, &psref); 1080 if (bif == NULL) 1081 return ENOENT; 1082 1083 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1084 req->ifba_flags); 1085 1086 bridge_release_member(sc, bif, &psref); 1087 1088 return error; 1089 } 1090 1091 static int 1092 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1093 { 1094 struct ifbrparam *param = arg; 1095 1096 sc->sc_brttimeout = param->ifbrp_ctime; 1097 1098 return 0; 1099 } 1100 1101 static int 1102 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1103 { 1104 struct ifbrparam *param = arg; 1105 1106 param->ifbrp_ctime = sc->sc_brttimeout; 1107 1108 return 0; 1109 } 1110 1111 static int 1112 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1113 { 1114 struct ifbareq *req = arg; 1115 1116 return (bridge_rtdaddr(sc, req->ifba_dst)); 1117 } 1118 1119 static int 1120 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1121 { 1122 struct ifbreq *req = arg; 1123 1124 bridge_rtflush(sc, req->ifbr_ifsflags); 1125 1126 return 0; 1127 } 1128 1129 static int 1130 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1131 { 1132 struct ifbrparam *param = arg; 1133 1134 param->ifbrp_prio = sc->sc_bridge_priority; 1135 1136 return 0; 1137 } 1138 1139 static int 1140 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1141 { 1142 struct ifbrparam *param = arg; 1143 1144 sc->sc_bridge_priority = param->ifbrp_prio; 1145 1146 if (sc->sc_if.if_flags & IFF_RUNNING) 1147 bstp_initialization(sc); 1148 1149 return 0; 1150 } 1151 1152 static int 1153 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1154 { 1155 struct ifbrparam *param = arg; 1156 1157 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1158 1159 return 0; 1160 } 1161 1162 static int 1163 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1164 { 1165 struct ifbrparam *param = arg; 1166 1167 if (param->ifbrp_hellotime == 0) 1168 return EINVAL; 1169 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1170 1171 if (sc->sc_if.if_flags & IFF_RUNNING) 1172 bstp_initialization(sc); 1173 1174 return 0; 1175 } 1176 1177 static int 1178 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1179 { 1180 struct ifbrparam *param = arg; 1181 1182 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1183 1184 return 0; 1185 } 1186 1187 static int 1188 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1189 { 1190 struct ifbrparam *param = arg; 1191 1192 if (param->ifbrp_fwddelay == 0) 1193 return EINVAL; 1194 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1195 1196 if (sc->sc_if.if_flags & IFF_RUNNING) 1197 bstp_initialization(sc); 1198 1199 return 0; 1200 } 1201 1202 static int 1203 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1204 { 1205 struct ifbrparam *param = arg; 1206 1207 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1208 1209 return 0; 1210 } 1211 1212 static int 1213 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1214 { 1215 struct ifbrparam *param = arg; 1216 1217 if (param->ifbrp_maxage == 0) 1218 return EINVAL; 1219 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1220 1221 if (sc->sc_if.if_flags & IFF_RUNNING) 1222 bstp_initialization(sc); 1223 1224 return 0; 1225 } 1226 1227 static int 1228 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1229 { 1230 struct ifbreq *req = arg; 1231 struct bridge_iflist *bif; 1232 struct psref psref; 1233 1234 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1235 if (bif == NULL) 1236 return ENOENT; 1237 1238 bif->bif_priority = req->ifbr_priority; 1239 1240 if (sc->sc_if.if_flags & IFF_RUNNING) 1241 bstp_initialization(sc); 1242 1243 bridge_release_member(sc, bif, &psref); 1244 1245 return 0; 1246 } 1247 1248 #if defined(BRIDGE_IPF) 1249 static int 1250 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1251 { 1252 struct ifbrparam *param = arg; 1253 1254 param->ifbrp_filter = sc->sc_filter_flags; 1255 1256 return 0; 1257 } 1258 1259 static int 1260 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1261 { 1262 struct ifbrparam *param = arg; 1263 uint32_t nflags, oflags; 1264 1265 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1266 return EINVAL; 1267 1268 nflags = param->ifbrp_filter; 1269 oflags = sc->sc_filter_flags; 1270 1271 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1272 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1273 sc->sc_if.if_pfil); 1274 } 1275 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1276 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1277 sc->sc_if.if_pfil); 1278 } 1279 1280 sc->sc_filter_flags = nflags; 1281 1282 return 0; 1283 } 1284 #endif /* BRIDGE_IPF */ 1285 1286 static int 1287 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1288 { 1289 struct ifbreq *req = arg; 1290 struct bridge_iflist *bif; 1291 struct psref psref; 1292 1293 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1294 if (bif == NULL) 1295 return ENOENT; 1296 1297 bif->bif_path_cost = req->ifbr_path_cost; 1298 1299 if (sc->sc_if.if_flags & IFF_RUNNING) 1300 bstp_initialization(sc); 1301 1302 bridge_release_member(sc, bif, &psref); 1303 1304 return 0; 1305 } 1306 1307 /* 1308 * bridge_ifdetach: 1309 * 1310 * Detach an interface from a bridge. Called when a member 1311 * interface is detaching. 1312 */ 1313 void 1314 bridge_ifdetach(struct ifnet *ifp) 1315 { 1316 struct bridge_softc *sc = ifp->if_bridge; 1317 struct ifbreq breq; 1318 1319 /* ioctl_lock should prevent this from happening */ 1320 KASSERT(sc != NULL); 1321 1322 memset(&breq, 0, sizeof(breq)); 1323 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1324 1325 (void) bridge_ioctl_del(sc, &breq); 1326 } 1327 1328 /* 1329 * bridge_init: 1330 * 1331 * Initialize a bridge interface. 1332 */ 1333 static int 1334 bridge_init(struct ifnet *ifp) 1335 { 1336 struct bridge_softc *sc = ifp->if_softc; 1337 1338 KASSERT((ifp->if_flags & IFF_RUNNING) == 0); 1339 1340 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1341 bridge_timer, sc); 1342 bstp_initialization(sc); 1343 1344 ifp->if_flags |= IFF_RUNNING; 1345 return 0; 1346 } 1347 1348 /* 1349 * bridge_stop: 1350 * 1351 * Stop the bridge interface. 1352 */ 1353 static void 1354 bridge_stop(struct ifnet *ifp, int disable) 1355 { 1356 struct bridge_softc *sc = ifp->if_softc; 1357 1358 KASSERT((ifp->if_flags & IFF_RUNNING) != 0); 1359 ifp->if_flags &= ~IFF_RUNNING; 1360 1361 callout_stop(&sc->sc_brcallout); 1362 bstp_stop(sc); 1363 bridge_rtflush(sc, IFBF_FLUSHDYN); 1364 } 1365 1366 /* 1367 * bridge_enqueue: 1368 * 1369 * Enqueue a packet on a bridge member interface. 1370 */ 1371 void 1372 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1373 int runfilt) 1374 { 1375 int len, error; 1376 short mflags; 1377 1378 /* 1379 * Clear any in-bound checksum flags for this packet. 1380 */ 1381 m->m_pkthdr.csum_flags = 0; 1382 1383 if (runfilt) { 1384 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1385 dst_ifp, PFIL_OUT) != 0) { 1386 if (m != NULL) 1387 m_freem(m); 1388 return; 1389 } 1390 if (m == NULL) 1391 return; 1392 } 1393 1394 #ifdef ALTQ 1395 KERNEL_LOCK(1, NULL); 1396 /* 1397 * If ALTQ is enabled on the member interface, do 1398 * classification; the queueing discipline might 1399 * not require classification, but might require 1400 * the address family/header pointer in the pktattr. 1401 */ 1402 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1403 /* XXX IFT_ETHER */ 1404 altq_etherclassify(&dst_ifp->if_snd, m); 1405 } 1406 KERNEL_UNLOCK_ONE(NULL); 1407 #endif /* ALTQ */ 1408 1409 len = m->m_pkthdr.len; 1410 mflags = m->m_flags; 1411 1412 error = if_transmit_lock(dst_ifp, m); 1413 if (error) { 1414 /* mbuf is already freed */ 1415 sc->sc_if.if_oerrors++; 1416 return; 1417 } 1418 1419 sc->sc_if.if_opackets++; 1420 sc->sc_if.if_obytes += len; 1421 if (mflags & M_MCAST) 1422 sc->sc_if.if_omcasts++; 1423 } 1424 1425 /* 1426 * bridge_output: 1427 * 1428 * Send output from a bridge member interface. This 1429 * performs the bridging function for locally originated 1430 * packets. 1431 * 1432 * The mbuf has the Ethernet header already attached. We must 1433 * enqueue or free the mbuf before returning. 1434 */ 1435 int 1436 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1437 const struct rtentry *rt) 1438 { 1439 struct ether_header *eh; 1440 struct ifnet *dst_if; 1441 struct bridge_softc *sc; 1442 int s; 1443 1444 /* 1445 * bridge_output() is called from ether_output(), furthermore 1446 * ifp argument doesn't point to bridge(4). So, don't assert 1447 * IFEF_MPSAFE here. 1448 */ 1449 1450 if (m->m_len < ETHER_HDR_LEN) { 1451 m = m_pullup(m, ETHER_HDR_LEN); 1452 if (m == NULL) 1453 return 0; 1454 } 1455 1456 eh = mtod(m, struct ether_header *); 1457 sc = ifp->if_bridge; 1458 1459 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1460 if (memcmp(etherbroadcastaddr, 1461 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1462 m->m_flags |= M_BCAST; 1463 else 1464 m->m_flags |= M_MCAST; 1465 } 1466 1467 /* 1468 * If bridge is down, but the original output interface is up, 1469 * go ahead and send out that interface. Otherwise, the packet 1470 * is dropped below. 1471 */ 1472 if (__predict_false(sc == NULL) || 1473 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1474 dst_if = ifp; 1475 goto sendunicast; 1476 } 1477 1478 /* 1479 * If the packet is a multicast, or we don't know a better way to 1480 * get there, send to all interfaces. 1481 */ 1482 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0) 1483 dst_if = NULL; 1484 else 1485 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1486 if (dst_if == NULL) { 1487 /* XXX Should call bridge_broadcast, but there are locking 1488 * issues which need resolving first. */ 1489 struct bridge_iflist *bif; 1490 struct mbuf *mc; 1491 bool used = false; 1492 1493 BRIDGE_PSZ_RENTER(s); 1494 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1495 struct psref psref; 1496 1497 bridge_acquire_member(sc, bif, &psref); 1498 BRIDGE_PSZ_REXIT(s); 1499 1500 dst_if = bif->bif_ifp; 1501 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1502 goto next; 1503 1504 /* 1505 * If this is not the original output interface, 1506 * and the interface is participating in spanning 1507 * tree, make sure the port is in a state that 1508 * allows forwarding. 1509 */ 1510 if (dst_if != ifp && 1511 (bif->bif_flags & IFBIF_STP) != 0) { 1512 switch (bif->bif_state) { 1513 case BSTP_IFSTATE_BLOCKING: 1514 case BSTP_IFSTATE_LISTENING: 1515 case BSTP_IFSTATE_DISABLED: 1516 goto next; 1517 } 1518 } 1519 1520 if (PSLIST_READER_NEXT(bif, struct bridge_iflist, 1521 bif_next) == NULL && 1522 ((m->m_flags & (M_MCAST | M_BCAST)) == 0 || 1523 dst_if == ifp)) 1524 { 1525 used = true; 1526 mc = m; 1527 } else { 1528 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1529 if (mc == NULL) { 1530 sc->sc_if.if_oerrors++; 1531 goto next; 1532 } 1533 } 1534 1535 bridge_enqueue(sc, dst_if, mc, 0); 1536 1537 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0 && 1538 dst_if != ifp) 1539 { 1540 if (PSLIST_READER_NEXT(bif, 1541 struct bridge_iflist, bif_next) == NULL) 1542 { 1543 used = true; 1544 mc = m; 1545 } else { 1546 mc = m_copym(m, 0, M_COPYALL, 1547 M_DONTWAIT); 1548 if (mc == NULL) { 1549 sc->sc_if.if_oerrors++; 1550 goto next; 1551 } 1552 } 1553 1554 m_set_rcvif(mc, dst_if); 1555 mc->m_flags &= ~M_PROMISC; 1556 1557 #ifndef NET_MPSAFE 1558 s = splsoftnet(); 1559 #endif 1560 ether_input(dst_if, mc); 1561 #ifndef NET_MPSAFE 1562 splx(s); 1563 #endif 1564 } 1565 1566 next: 1567 BRIDGE_PSZ_RENTER(s); 1568 bridge_release_member(sc, bif, &psref); 1569 1570 /* Guarantee we don't re-enter the loop as we already 1571 * decided we're at the end. */ 1572 if (used) 1573 break; 1574 } 1575 BRIDGE_PSZ_REXIT(s); 1576 1577 if (!used) 1578 m_freem(m); 1579 return 0; 1580 } 1581 1582 sendunicast: 1583 /* 1584 * XXX Spanning tree consideration here? 1585 */ 1586 1587 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1588 m_freem(m); 1589 return 0; 1590 } 1591 1592 bridge_enqueue(sc, dst_if, m, 0); 1593 1594 return 0; 1595 } 1596 1597 /* 1598 * bridge_start: 1599 * 1600 * Start output on a bridge. 1601 * 1602 * NOTE: This routine should never be called in this implementation. 1603 */ 1604 static void 1605 bridge_start(struct ifnet *ifp) 1606 { 1607 1608 printf("%s: bridge_start() called\n", ifp->if_xname); 1609 } 1610 1611 /* 1612 * bridge_forward: 1613 * 1614 * The forwarding function of the bridge. 1615 */ 1616 static void 1617 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1618 { 1619 struct bridge_iflist *bif; 1620 struct ifnet *src_if, *dst_if; 1621 struct ether_header *eh; 1622 struct psref psref; 1623 struct psref psref_src; 1624 DECLARE_LOCK_VARIABLE; 1625 1626 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1627 return; 1628 1629 src_if = m_get_rcvif_psref(m, &psref_src); 1630 if (src_if == NULL) { 1631 /* Interface is being destroyed? */ 1632 m_freem(m); 1633 goto out; 1634 } 1635 1636 sc->sc_if.if_ipackets++; 1637 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1638 1639 /* 1640 * Look up the bridge_iflist. 1641 */ 1642 bif = bridge_lookup_member_if(sc, src_if, &psref); 1643 if (bif == NULL) { 1644 /* Interface is not a bridge member (anymore?) */ 1645 m_freem(m); 1646 goto out; 1647 } 1648 1649 if (bif->bif_flags & IFBIF_STP) { 1650 switch (bif->bif_state) { 1651 case BSTP_IFSTATE_BLOCKING: 1652 case BSTP_IFSTATE_LISTENING: 1653 case BSTP_IFSTATE_DISABLED: 1654 m_freem(m); 1655 bridge_release_member(sc, bif, &psref); 1656 goto out; 1657 } 1658 } 1659 1660 eh = mtod(m, struct ether_header *); 1661 1662 /* 1663 * If the interface is learning, and the source 1664 * address is valid and not multicast, record 1665 * the address. 1666 */ 1667 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1668 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1669 (eh->ether_shost[0] == 0 && 1670 eh->ether_shost[1] == 0 && 1671 eh->ether_shost[2] == 0 && 1672 eh->ether_shost[3] == 0 && 1673 eh->ether_shost[4] == 0 && 1674 eh->ether_shost[5] == 0) == 0) { 1675 (void) bridge_rtupdate(sc, eh->ether_shost, 1676 src_if, 0, IFBAF_DYNAMIC); 1677 } 1678 1679 if ((bif->bif_flags & IFBIF_STP) != 0 && 1680 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1681 m_freem(m); 1682 bridge_release_member(sc, bif, &psref); 1683 goto out; 1684 } 1685 1686 bridge_release_member(sc, bif, &psref); 1687 1688 /* 1689 * At this point, the port either doesn't participate 1690 * in spanning tree or it is in the forwarding state. 1691 */ 1692 1693 /* 1694 * If the packet is unicast, destined for someone on 1695 * "this" side of the bridge, drop it. 1696 */ 1697 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1698 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1699 if (src_if == dst_if) { 1700 m_freem(m); 1701 goto out; 1702 } 1703 } else { 1704 /* ...forward it to all interfaces. */ 1705 sc->sc_if.if_imcasts++; 1706 dst_if = NULL; 1707 } 1708 1709 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, src_if, PFIL_IN) != 0) { 1710 if (m != NULL) 1711 m_freem(m); 1712 goto out; 1713 } 1714 if (m == NULL) 1715 goto out; 1716 1717 if (dst_if == NULL) { 1718 bridge_broadcast(sc, src_if, m); 1719 goto out; 1720 } 1721 1722 m_put_rcvif_psref(src_if, &psref_src); 1723 src_if = NULL; 1724 1725 /* 1726 * At this point, we're dealing with a unicast frame 1727 * going to a different interface. 1728 */ 1729 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1730 m_freem(m); 1731 goto out; 1732 } 1733 1734 bif = bridge_lookup_member_if(sc, dst_if, &psref); 1735 if (bif == NULL) { 1736 /* Not a member of the bridge (anymore?) */ 1737 m_freem(m); 1738 goto out; 1739 } 1740 1741 if (bif->bif_flags & IFBIF_STP) { 1742 switch (bif->bif_state) { 1743 case BSTP_IFSTATE_DISABLED: 1744 case BSTP_IFSTATE_BLOCKING: 1745 m_freem(m); 1746 bridge_release_member(sc, bif, &psref); 1747 goto out; 1748 } 1749 } 1750 1751 bridge_release_member(sc, bif, &psref); 1752 1753 ACQUIRE_GLOBAL_LOCKS(); 1754 bridge_enqueue(sc, dst_if, m, 1); 1755 RELEASE_GLOBAL_LOCKS(); 1756 out: 1757 if (src_if != NULL) 1758 m_put_rcvif_psref(src_if, &psref_src); 1759 return; 1760 } 1761 1762 static bool 1763 bstp_state_before_learning(struct bridge_iflist *bif) 1764 { 1765 if (bif->bif_flags & IFBIF_STP) { 1766 switch (bif->bif_state) { 1767 case BSTP_IFSTATE_BLOCKING: 1768 case BSTP_IFSTATE_LISTENING: 1769 case BSTP_IFSTATE_DISABLED: 1770 return true; 1771 } 1772 } 1773 return false; 1774 } 1775 1776 static bool 1777 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1778 { 1779 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1780 1781 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1782 #if NCARP > 0 1783 || (bif->bif_ifp->if_carp && 1784 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1785 #endif /* NCARP > 0 */ 1786 ) 1787 return true; 1788 1789 return false; 1790 } 1791 1792 /* 1793 * bridge_input: 1794 * 1795 * Receive input from a member interface. Queue the packet for 1796 * bridging if it is not for us. 1797 */ 1798 static void 1799 bridge_input(struct ifnet *ifp, struct mbuf *m) 1800 { 1801 struct bridge_softc *sc = ifp->if_bridge; 1802 struct bridge_iflist *bif; 1803 struct ether_header *eh; 1804 struct psref psref; 1805 int bound; 1806 DECLARE_LOCK_VARIABLE; 1807 1808 KASSERT(!cpu_intr_p()); 1809 1810 if (__predict_false(sc == NULL) || 1811 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1812 ACQUIRE_GLOBAL_LOCKS(); 1813 ether_input(ifp, m); 1814 RELEASE_GLOBAL_LOCKS(); 1815 return; 1816 } 1817 1818 bound = curlwp_bind(); 1819 bif = bridge_lookup_member_if(sc, ifp, &psref); 1820 if (bif == NULL) { 1821 curlwp_bindx(bound); 1822 ACQUIRE_GLOBAL_LOCKS(); 1823 ether_input(ifp, m); 1824 RELEASE_GLOBAL_LOCKS(); 1825 return; 1826 } 1827 1828 eh = mtod(m, struct ether_header *); 1829 1830 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1831 if (memcmp(etherbroadcastaddr, 1832 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1833 m->m_flags |= M_BCAST; 1834 else 1835 m->m_flags |= M_MCAST; 1836 } 1837 1838 /* 1839 * A 'fast' path for packets addressed to interfaces that are 1840 * part of this bridge. 1841 */ 1842 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 1843 !bstp_state_before_learning(bif)) { 1844 struct bridge_iflist *_bif; 1845 struct ifnet *_ifp = NULL; 1846 int s; 1847 struct psref _psref; 1848 1849 BRIDGE_PSZ_RENTER(s); 1850 BRIDGE_IFLIST_READER_FOREACH(_bif, sc) { 1851 /* It is destined for us. */ 1852 if (bridge_ourether(_bif, eh, 0)) { 1853 bridge_acquire_member(sc, _bif, &_psref); 1854 BRIDGE_PSZ_REXIT(s); 1855 if (_bif->bif_flags & IFBIF_LEARNING) 1856 (void) bridge_rtupdate(sc, 1857 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1858 m_set_rcvif(m, _bif->bif_ifp); 1859 _ifp = _bif->bif_ifp; 1860 bridge_release_member(sc, _bif, &_psref); 1861 goto out; 1862 } 1863 1864 /* We just received a packet that we sent out. */ 1865 if (bridge_ourether(_bif, eh, 1)) 1866 break; 1867 } 1868 BRIDGE_PSZ_REXIT(s); 1869 out: 1870 1871 if (_bif != NULL) { 1872 bridge_release_member(sc, bif, &psref); 1873 curlwp_bindx(bound); 1874 if (_ifp != NULL) { 1875 m->m_flags &= ~M_PROMISC; 1876 ACQUIRE_GLOBAL_LOCKS(); 1877 ether_input(_ifp, m); 1878 RELEASE_GLOBAL_LOCKS(); 1879 } else 1880 m_freem(m); 1881 return; 1882 } 1883 } 1884 1885 /* Tap off 802.1D packets; they do not get forwarded. */ 1886 if (bif->bif_flags & IFBIF_STP && 1887 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 1888 bstp_input(sc, bif, m); 1889 bridge_release_member(sc, bif, &psref); 1890 curlwp_bindx(bound); 1891 return; 1892 } 1893 1894 /* 1895 * A normal switch would discard the packet here, but that's not what 1896 * we've done historically. This also prevents some obnoxious behaviour. 1897 */ 1898 if (bstp_state_before_learning(bif)) { 1899 bridge_release_member(sc, bif, &psref); 1900 curlwp_bindx(bound); 1901 ACQUIRE_GLOBAL_LOCKS(); 1902 ether_input(ifp, m); 1903 RELEASE_GLOBAL_LOCKS(); 1904 return; 1905 } 1906 1907 bridge_release_member(sc, bif, &psref); 1908 1909 bridge_forward(sc, m); 1910 1911 curlwp_bindx(bound); 1912 } 1913 1914 /* 1915 * bridge_broadcast: 1916 * 1917 * Send a frame to all interfaces that are members of 1918 * the bridge, except for the one on which the packet 1919 * arrived. 1920 */ 1921 static void 1922 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1923 struct mbuf *m) 1924 { 1925 struct bridge_iflist *bif; 1926 struct mbuf *mc; 1927 struct ifnet *dst_if; 1928 bool bmcast; 1929 int s; 1930 DECLARE_LOCK_VARIABLE; 1931 1932 bmcast = m->m_flags & (M_BCAST|M_MCAST); 1933 1934 BRIDGE_PSZ_RENTER(s); 1935 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1936 struct psref psref; 1937 1938 bridge_acquire_member(sc, bif, &psref); 1939 BRIDGE_PSZ_REXIT(s); 1940 1941 dst_if = bif->bif_ifp; 1942 1943 if (bif->bif_flags & IFBIF_STP) { 1944 switch (bif->bif_state) { 1945 case BSTP_IFSTATE_BLOCKING: 1946 case BSTP_IFSTATE_DISABLED: 1947 goto next; 1948 } 1949 } 1950 1951 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 1952 goto next; 1953 1954 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1955 goto next; 1956 1957 if (dst_if != src_if) { 1958 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1959 if (mc == NULL) { 1960 sc->sc_if.if_oerrors++; 1961 goto next; 1962 } 1963 ACQUIRE_GLOBAL_LOCKS(); 1964 bridge_enqueue(sc, dst_if, mc, 1); 1965 RELEASE_GLOBAL_LOCKS(); 1966 } 1967 1968 if (bmcast) { 1969 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1970 if (mc == NULL) { 1971 sc->sc_if.if_oerrors++; 1972 goto next; 1973 } 1974 1975 m_set_rcvif(mc, dst_if); 1976 mc->m_flags &= ~M_PROMISC; 1977 1978 ACQUIRE_GLOBAL_LOCKS(); 1979 ether_input(dst_if, mc); 1980 RELEASE_GLOBAL_LOCKS(); 1981 } 1982 next: 1983 BRIDGE_PSZ_RENTER(s); 1984 bridge_release_member(sc, bif, &psref); 1985 } 1986 BRIDGE_PSZ_REXIT(s); 1987 1988 m_freem(m); 1989 } 1990 1991 static int 1992 bridge_rtalloc(struct bridge_softc *sc, const uint8_t *dst, 1993 struct bridge_rtnode **brtp) 1994 { 1995 struct bridge_rtnode *brt; 1996 int error; 1997 1998 if (sc->sc_brtcnt >= sc->sc_brtmax) 1999 return ENOSPC; 2000 2001 /* 2002 * Allocate a new bridge forwarding node, and 2003 * initialize the expiration time and Ethernet 2004 * address. 2005 */ 2006 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 2007 if (brt == NULL) 2008 return ENOMEM; 2009 2010 memset(brt, 0, sizeof(*brt)); 2011 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2012 brt->brt_flags = IFBAF_DYNAMIC; 2013 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2014 2015 BRIDGE_RT_LOCK(sc); 2016 error = bridge_rtnode_insert(sc, brt); 2017 BRIDGE_RT_UNLOCK(sc); 2018 2019 if (error != 0) { 2020 pool_put(&bridge_rtnode_pool, brt); 2021 return error; 2022 } 2023 2024 *brtp = brt; 2025 return 0; 2026 } 2027 2028 /* 2029 * bridge_rtupdate: 2030 * 2031 * Add a bridge routing entry. 2032 */ 2033 static int 2034 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 2035 struct ifnet *dst_if, int setflags, uint8_t flags) 2036 { 2037 struct bridge_rtnode *brt; 2038 int s; 2039 2040 again: 2041 /* 2042 * A route for this destination might already exist. If so, 2043 * update it, otherwise create a new one. 2044 */ 2045 BRIDGE_RT_RENTER(s); 2046 brt = bridge_rtnode_lookup(sc, dst); 2047 2048 if (brt != NULL) { 2049 brt->brt_ifp = dst_if; 2050 if (setflags) { 2051 brt->brt_flags = flags; 2052 if (flags & IFBAF_STATIC) 2053 brt->brt_expire = 0; 2054 else 2055 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2056 } else { 2057 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2058 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2059 } 2060 } 2061 BRIDGE_RT_REXIT(s); 2062 2063 if (brt == NULL) { 2064 int r; 2065 2066 r = bridge_rtalloc(sc, dst, &brt); 2067 if (r != 0) 2068 return r; 2069 goto again; 2070 } 2071 2072 return 0; 2073 } 2074 2075 /* 2076 * bridge_rtlookup: 2077 * 2078 * Lookup the destination interface for an address. 2079 */ 2080 static struct ifnet * 2081 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2082 { 2083 struct bridge_rtnode *brt; 2084 struct ifnet *ifs = NULL; 2085 int s; 2086 2087 BRIDGE_RT_RENTER(s); 2088 brt = bridge_rtnode_lookup(sc, addr); 2089 if (brt != NULL) 2090 ifs = brt->brt_ifp; 2091 BRIDGE_RT_REXIT(s); 2092 2093 return ifs; 2094 } 2095 2096 typedef bool (*bridge_iterate_cb_t) 2097 (struct bridge_softc *, struct bridge_rtnode *, bool *, void *); 2098 2099 /* 2100 * bridge_rtlist_iterate_remove: 2101 * 2102 * It iterates on sc->sc_rtlist and removes rtnodes of it which func 2103 * callback judges to remove. Removals of rtnodes are done in a manner 2104 * of pserialize. To this end, all kmem_* operations are placed out of 2105 * mutexes. 2106 */ 2107 static void 2108 bridge_rtlist_iterate_remove(struct bridge_softc *sc, bridge_iterate_cb_t func, void *arg) 2109 { 2110 struct bridge_rtnode *brt, *nbrt; 2111 struct bridge_rtnode **brt_list; 2112 int i, count; 2113 2114 retry: 2115 count = sc->sc_brtcnt; 2116 if (count == 0) 2117 return; 2118 brt_list = kmem_alloc(sizeof(*brt_list) * count, KM_SLEEP); 2119 2120 BRIDGE_RT_LOCK(sc); 2121 if (__predict_false(sc->sc_brtcnt > count)) { 2122 /* The rtnodes increased, we need more memory */ 2123 BRIDGE_RT_UNLOCK(sc); 2124 kmem_free(brt_list, sizeof(*brt_list) * count); 2125 goto retry; 2126 } 2127 2128 i = 0; 2129 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2130 bool need_break = false; 2131 if (func(sc, brt, &need_break, arg)) { 2132 bridge_rtnode_remove(sc, brt); 2133 brt_list[i++] = brt; 2134 } 2135 if (need_break) 2136 break; 2137 } 2138 2139 if (i > 0) 2140 BRIDGE_RT_PSZ_PERFORM(sc); 2141 BRIDGE_RT_UNLOCK(sc); 2142 2143 while (--i >= 0) 2144 bridge_rtnode_destroy(brt_list[i]); 2145 2146 kmem_free(brt_list, sizeof(*brt_list) * count); 2147 } 2148 2149 static bool 2150 bridge_rttrim0_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2151 bool *need_break, void *arg) 2152 { 2153 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2154 /* Take into account of the subsequent removal */ 2155 if ((sc->sc_brtcnt - 1) <= sc->sc_brtmax) 2156 *need_break = true; 2157 return true; 2158 } else 2159 return false; 2160 } 2161 2162 static void 2163 bridge_rttrim0(struct bridge_softc *sc) 2164 { 2165 bridge_rtlist_iterate_remove(sc, bridge_rttrim0_cb, NULL); 2166 } 2167 2168 /* 2169 * bridge_rttrim: 2170 * 2171 * Trim the routine table so that we have a number 2172 * of routing entries less than or equal to the 2173 * maximum number. 2174 */ 2175 static void 2176 bridge_rttrim(struct bridge_softc *sc) 2177 { 2178 2179 /* Make sure we actually need to do this. */ 2180 if (sc->sc_brtcnt <= sc->sc_brtmax) 2181 return; 2182 2183 /* Force an aging cycle; this might trim enough addresses. */ 2184 bridge_rtage(sc); 2185 if (sc->sc_brtcnt <= sc->sc_brtmax) 2186 return; 2187 2188 bridge_rttrim0(sc); 2189 2190 return; 2191 } 2192 2193 /* 2194 * bridge_timer: 2195 * 2196 * Aging timer for the bridge. 2197 */ 2198 static void 2199 bridge_timer(void *arg) 2200 { 2201 struct bridge_softc *sc = arg; 2202 2203 workqueue_enqueue(sc->sc_rtage_wq, &sc->sc_rtage_wk, NULL); 2204 } 2205 2206 static void 2207 bridge_rtage_work(struct work *wk, void *arg) 2208 { 2209 struct bridge_softc *sc = arg; 2210 2211 KASSERT(wk == &sc->sc_rtage_wk); 2212 2213 bridge_rtage(sc); 2214 2215 if (sc->sc_if.if_flags & IFF_RUNNING) 2216 callout_reset(&sc->sc_brcallout, 2217 bridge_rtable_prune_period * hz, bridge_timer, sc); 2218 } 2219 2220 static bool 2221 bridge_rtage_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2222 bool *need_break, void *arg) 2223 { 2224 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2225 time_uptime >= brt->brt_expire) 2226 return true; 2227 else 2228 return false; 2229 } 2230 2231 /* 2232 * bridge_rtage: 2233 * 2234 * Perform an aging cycle. 2235 */ 2236 static void 2237 bridge_rtage(struct bridge_softc *sc) 2238 { 2239 bridge_rtlist_iterate_remove(sc, bridge_rtage_cb, NULL); 2240 } 2241 2242 2243 static bool 2244 bridge_rtflush_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2245 bool *need_break, void *arg) 2246 { 2247 int full = *(int*)arg; 2248 2249 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2250 return true; 2251 else 2252 return false; 2253 } 2254 2255 /* 2256 * bridge_rtflush: 2257 * 2258 * Remove all dynamic addresses from the bridge. 2259 */ 2260 static void 2261 bridge_rtflush(struct bridge_softc *sc, int full) 2262 { 2263 bridge_rtlist_iterate_remove(sc, bridge_rtflush_cb, &full); 2264 } 2265 2266 /* 2267 * bridge_rtdaddr: 2268 * 2269 * Remove an address from the table. 2270 */ 2271 static int 2272 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2273 { 2274 struct bridge_rtnode *brt; 2275 2276 BRIDGE_RT_LOCK(sc); 2277 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2278 BRIDGE_RT_UNLOCK(sc); 2279 return ENOENT; 2280 } 2281 bridge_rtnode_remove(sc, brt); 2282 BRIDGE_RT_PSZ_PERFORM(sc); 2283 BRIDGE_RT_UNLOCK(sc); 2284 2285 bridge_rtnode_destroy(brt); 2286 2287 return 0; 2288 } 2289 2290 /* 2291 * bridge_rtdelete: 2292 * 2293 * Delete routes to a speicifc member interface. 2294 */ 2295 static void 2296 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2297 { 2298 struct bridge_rtnode *brt; 2299 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 2316 /* 2317 * bridge_rtable_init: 2318 * 2319 * Initialize the route table for this bridge. 2320 */ 2321 static void 2322 bridge_rtable_init(struct bridge_softc *sc) 2323 { 2324 int i; 2325 2326 sc->sc_rthash = kmem_alloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2327 KM_SLEEP); 2328 2329 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2330 LIST_INIT(&sc->sc_rthash[i]); 2331 2332 sc->sc_rthash_key = cprng_fast32(); 2333 2334 LIST_INIT(&sc->sc_rtlist); 2335 2336 sc->sc_rtlist_psz = pserialize_create(); 2337 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 2338 } 2339 2340 /* 2341 * bridge_rtable_fini: 2342 * 2343 * Deconstruct the route table for this bridge. 2344 */ 2345 static void 2346 bridge_rtable_fini(struct bridge_softc *sc) 2347 { 2348 2349 kmem_free(sc->sc_rthash, sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE); 2350 if (sc->sc_rtlist_lock) 2351 mutex_obj_free(sc->sc_rtlist_lock); 2352 if (sc->sc_rtlist_psz) 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 Thu Oct 02 14:10:14 GMT 2025