if_bridge.c revision 1.143
1 /* $NetBSD: if_bridge.c,v 1.143 2017/12/06 07:40:16 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 1.143 2017/12/06 07:40:16 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_MPSAFE | IFEF_NO_LINK_STATE_CHANGE; 428 ifp->if_mtu = ETHERMTU; 429 ifp->if_ioctl = bridge_ioctl; 430 ifp->if_output = bridge_output; 431 ifp->if_start = bridge_start; 432 ifp->if_stop = bridge_stop; 433 ifp->if_init = bridge_init; 434 ifp->if_type = IFT_BRIDGE; 435 ifp->if_addrlen = 0; 436 ifp->if_dlt = DLT_EN10MB; 437 ifp->if_hdrlen = ETHER_HDR_LEN; 438 439 error = if_initialize(ifp); 440 if (error != 0) { 441 pserialize_destroy(sc->sc_iflist_psref.bip_psz); 442 mutex_destroy(&sc->sc_iflist_psref.bip_lock); 443 callout_destroy(&sc->sc_brcallout); 444 callout_destroy(&sc->sc_bstpcallout); 445 workqueue_destroy(sc->sc_rtage_wq); 446 bridge_rtable_fini(sc); 447 kmem_free(sc, sizeof(*sc)); 448 449 return error; 450 } 451 if_register(ifp); 452 453 if_alloc_sadl(ifp); 454 455 return 0; 456 } 457 458 /* 459 * bridge_clone_destroy: 460 * 461 * Destroy a bridge instance. 462 */ 463 static int 464 bridge_clone_destroy(struct ifnet *ifp) 465 { 466 struct bridge_softc *sc = ifp->if_softc; 467 struct bridge_iflist *bif; 468 469 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 error = if_enable_vlan_mtu(ifs); 776 if (error > 0) 777 goto out; 778 /* 779 * Place the interface into promiscuous mode. 780 */ 781 error = ifpromisc(ifs, 1); 782 if (error) 783 goto out; 784 break; 785 default: 786 error = EINVAL; 787 goto out; 788 } 789 790 bif->bif_ifp = ifs; 791 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 792 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 793 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 794 PSLIST_ENTRY_INIT(bif, bif_next); 795 psref_target_init(&bif->bif_psref, bridge_psref_class); 796 797 BRIDGE_LOCK(sc); 798 799 ifs->if_bridge = sc; 800 ifs->if_bridgeif = bif; 801 PSLIST_WRITER_INSERT_HEAD(&sc->sc_iflist_psref.bip_iflist, bif, bif_next); 802 ifs->_if_input = bridge_input; 803 804 BRIDGE_UNLOCK(sc); 805 806 if (sc->sc_if.if_flags & IFF_RUNNING) 807 bstp_initialization(sc); 808 else 809 bstp_stop(sc); 810 811 out: 812 if_put(ifs, &psref); 813 if (error) { 814 if (bif != NULL) 815 kmem_free(bif, sizeof(*bif)); 816 } 817 return error; 818 } 819 820 static int 821 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 822 { 823 struct ifbreq *req = arg; 824 const char *name = req->ifbr_ifsname; 825 struct bridge_iflist *bif; 826 struct ifnet *ifs; 827 828 BRIDGE_LOCK(sc); 829 830 /* 831 * Don't use bridge_lookup_member. We want to get a member 832 * with bif_refs == 0. 833 */ 834 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 835 ifs = bif->bif_ifp; 836 if (strcmp(ifs->if_xname, name) == 0) 837 break; 838 } 839 840 if (bif == NULL) { 841 BRIDGE_UNLOCK(sc); 842 return ENOENT; 843 } 844 845 bridge_delete_member(sc, bif); 846 847 BRIDGE_UNLOCK(sc); 848 849 switch (ifs->if_type) { 850 case IFT_ETHER: 851 case IFT_L2TP: 852 /* 853 * Take the interface out of promiscuous mode. 854 * Don't call it with holding a spin lock. 855 */ 856 (void) ifpromisc(ifs, 0); 857 (void) if_disable_vlan_mtu(ifs); 858 break; 859 default: 860 #ifdef DIAGNOSTIC 861 panic("bridge_delete_member: impossible"); 862 #endif 863 break; 864 } 865 866 bridge_rtdelete(sc, ifs); 867 868 if (sc->sc_if.if_flags & IFF_RUNNING) 869 bstp_initialization(sc); 870 871 return 0; 872 } 873 874 static int 875 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 876 { 877 struct ifbreq *req = arg; 878 struct bridge_iflist *bif; 879 struct psref psref; 880 881 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 882 if (bif == NULL) 883 return ENOENT; 884 885 req->ifbr_ifsflags = bif->bif_flags; 886 req->ifbr_state = bif->bif_state; 887 req->ifbr_priority = bif->bif_priority; 888 req->ifbr_path_cost = bif->bif_path_cost; 889 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 890 891 bridge_release_member(sc, bif, &psref); 892 893 return 0; 894 } 895 896 static int 897 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 898 { 899 struct ifbreq *req = arg; 900 struct bridge_iflist *bif; 901 struct psref psref; 902 903 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 904 if (bif == NULL) 905 return ENOENT; 906 907 if (req->ifbr_ifsflags & IFBIF_STP) { 908 switch (bif->bif_ifp->if_type) { 909 case IFT_ETHER: 910 case IFT_L2TP: 911 /* These can do spanning tree. */ 912 break; 913 914 default: 915 /* Nothing else can. */ 916 bridge_release_member(sc, bif, &psref); 917 return EINVAL; 918 } 919 } 920 921 bif->bif_flags = req->ifbr_ifsflags; 922 923 bridge_release_member(sc, bif, &psref); 924 925 if (sc->sc_if.if_flags & IFF_RUNNING) 926 bstp_initialization(sc); 927 928 return 0; 929 } 930 931 static int 932 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 933 { 934 struct ifbrparam *param = arg; 935 936 sc->sc_brtmax = param->ifbrp_csize; 937 bridge_rttrim(sc); 938 939 return 0; 940 } 941 942 static int 943 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 944 { 945 struct ifbrparam *param = arg; 946 947 param->ifbrp_csize = sc->sc_brtmax; 948 949 return 0; 950 } 951 952 static int 953 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 954 { 955 struct ifbifconf *bifc = arg; 956 struct bridge_iflist *bif; 957 struct ifbreq *breqs; 958 int i, count, error = 0; 959 960 retry: 961 BRIDGE_LOCK(sc); 962 count = 0; 963 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 964 count++; 965 BRIDGE_UNLOCK(sc); 966 967 if (count == 0) { 968 bifc->ifbic_len = 0; 969 return 0; 970 } 971 972 if (bifc->ifbic_len == 0 || bifc->ifbic_len < (sizeof(*breqs) * count)) { 973 /* Tell that a larger buffer is needed */ 974 bifc->ifbic_len = sizeof(*breqs) * count; 975 return 0; 976 } 977 978 breqs = kmem_alloc(sizeof(*breqs) * count, KM_SLEEP); 979 980 BRIDGE_LOCK(sc); 981 982 i = 0; 983 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) 984 i++; 985 if (i > count) { 986 /* 987 * The number of members has been increased. 988 * We need more memory! 989 */ 990 BRIDGE_UNLOCK(sc); 991 kmem_free(breqs, sizeof(*breqs) * count); 992 goto retry; 993 } 994 995 i = 0; 996 BRIDGE_IFLIST_WRITER_FOREACH(bif, sc) { 997 struct ifbreq *breq = &breqs[i++]; 998 memset(breq, 0, sizeof(*breq)); 999 1000 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, 1001 sizeof(breq->ifbr_ifsname)); 1002 breq->ifbr_ifsflags = bif->bif_flags; 1003 breq->ifbr_state = bif->bif_state; 1004 breq->ifbr_priority = bif->bif_priority; 1005 breq->ifbr_path_cost = bif->bif_path_cost; 1006 breq->ifbr_portno = bif->bif_ifp->if_index & 0xff; 1007 } 1008 1009 /* Don't call copyout with holding the mutex */ 1010 BRIDGE_UNLOCK(sc); 1011 1012 for (i = 0; i < count; i++) { 1013 error = copyout(&breqs[i], bifc->ifbic_req + i, sizeof(*breqs)); 1014 if (error) 1015 break; 1016 } 1017 bifc->ifbic_len = sizeof(*breqs) * i; 1018 1019 kmem_free(breqs, sizeof(*breqs) * count); 1020 1021 return error; 1022 } 1023 1024 static int 1025 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1026 { 1027 struct ifbaconf *bac = arg; 1028 struct bridge_rtnode *brt; 1029 struct ifbareq bareq; 1030 int count = 0, error = 0, len; 1031 1032 if (bac->ifbac_len == 0) 1033 return 0; 1034 1035 BRIDGE_RT_LOCK(sc); 1036 1037 len = bac->ifbac_len; 1038 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1039 if (len < sizeof(bareq)) 1040 goto out; 1041 memset(&bareq, 0, sizeof(bareq)); 1042 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1043 sizeof(bareq.ifba_ifsname)); 1044 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1045 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1046 bareq.ifba_expire = brt->brt_expire - time_uptime; 1047 } else 1048 bareq.ifba_expire = 0; 1049 bareq.ifba_flags = brt->brt_flags; 1050 1051 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1052 if (error) 1053 goto out; 1054 count++; 1055 len -= sizeof(bareq); 1056 } 1057 out: 1058 BRIDGE_RT_UNLOCK(sc); 1059 1060 bac->ifbac_len = sizeof(bareq) * count; 1061 return error; 1062 } 1063 1064 static int 1065 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1066 { 1067 struct ifbareq *req = arg; 1068 struct bridge_iflist *bif; 1069 int error; 1070 struct psref psref; 1071 1072 bif = bridge_lookup_member(sc, req->ifba_ifsname, &psref); 1073 if (bif == NULL) 1074 return ENOENT; 1075 1076 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1077 req->ifba_flags); 1078 1079 bridge_release_member(sc, bif, &psref); 1080 1081 return error; 1082 } 1083 1084 static int 1085 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1086 { 1087 struct ifbrparam *param = arg; 1088 1089 sc->sc_brttimeout = param->ifbrp_ctime; 1090 1091 return 0; 1092 } 1093 1094 static int 1095 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1096 { 1097 struct ifbrparam *param = arg; 1098 1099 param->ifbrp_ctime = sc->sc_brttimeout; 1100 1101 return 0; 1102 } 1103 1104 static int 1105 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1106 { 1107 struct ifbareq *req = arg; 1108 1109 return (bridge_rtdaddr(sc, req->ifba_dst)); 1110 } 1111 1112 static int 1113 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1114 { 1115 struct ifbreq *req = arg; 1116 1117 bridge_rtflush(sc, req->ifbr_ifsflags); 1118 1119 return 0; 1120 } 1121 1122 static int 1123 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1124 { 1125 struct ifbrparam *param = arg; 1126 1127 param->ifbrp_prio = sc->sc_bridge_priority; 1128 1129 return 0; 1130 } 1131 1132 static int 1133 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1134 { 1135 struct ifbrparam *param = arg; 1136 1137 sc->sc_bridge_priority = param->ifbrp_prio; 1138 1139 if (sc->sc_if.if_flags & IFF_RUNNING) 1140 bstp_initialization(sc); 1141 1142 return 0; 1143 } 1144 1145 static int 1146 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1147 { 1148 struct ifbrparam *param = arg; 1149 1150 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1151 1152 return 0; 1153 } 1154 1155 static int 1156 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1157 { 1158 struct ifbrparam *param = arg; 1159 1160 if (param->ifbrp_hellotime == 0) 1161 return EINVAL; 1162 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1163 1164 if (sc->sc_if.if_flags & IFF_RUNNING) 1165 bstp_initialization(sc); 1166 1167 return 0; 1168 } 1169 1170 static int 1171 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1172 { 1173 struct ifbrparam *param = arg; 1174 1175 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1176 1177 return 0; 1178 } 1179 1180 static int 1181 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1182 { 1183 struct ifbrparam *param = arg; 1184 1185 if (param->ifbrp_fwddelay == 0) 1186 return EINVAL; 1187 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1188 1189 if (sc->sc_if.if_flags & IFF_RUNNING) 1190 bstp_initialization(sc); 1191 1192 return 0; 1193 } 1194 1195 static int 1196 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1197 { 1198 struct ifbrparam *param = arg; 1199 1200 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1201 1202 return 0; 1203 } 1204 1205 static int 1206 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1207 { 1208 struct ifbrparam *param = arg; 1209 1210 if (param->ifbrp_maxage == 0) 1211 return EINVAL; 1212 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1213 1214 if (sc->sc_if.if_flags & IFF_RUNNING) 1215 bstp_initialization(sc); 1216 1217 return 0; 1218 } 1219 1220 static int 1221 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1222 { 1223 struct ifbreq *req = arg; 1224 struct bridge_iflist *bif; 1225 struct psref psref; 1226 1227 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1228 if (bif == NULL) 1229 return ENOENT; 1230 1231 bif->bif_priority = req->ifbr_priority; 1232 1233 if (sc->sc_if.if_flags & IFF_RUNNING) 1234 bstp_initialization(sc); 1235 1236 bridge_release_member(sc, bif, &psref); 1237 1238 return 0; 1239 } 1240 1241 #if defined(BRIDGE_IPF) 1242 static int 1243 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1244 { 1245 struct ifbrparam *param = arg; 1246 1247 param->ifbrp_filter = sc->sc_filter_flags; 1248 1249 return 0; 1250 } 1251 1252 static int 1253 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1254 { 1255 struct ifbrparam *param = arg; 1256 uint32_t nflags, oflags; 1257 1258 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1259 return EINVAL; 1260 1261 nflags = param->ifbrp_filter; 1262 oflags = sc->sc_filter_flags; 1263 1264 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1265 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1266 sc->sc_if.if_pfil); 1267 } 1268 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1269 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1270 sc->sc_if.if_pfil); 1271 } 1272 1273 sc->sc_filter_flags = nflags; 1274 1275 return 0; 1276 } 1277 #endif /* BRIDGE_IPF */ 1278 1279 static int 1280 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1281 { 1282 struct ifbreq *req = arg; 1283 struct bridge_iflist *bif; 1284 struct psref psref; 1285 1286 bif = bridge_lookup_member(sc, req->ifbr_ifsname, &psref); 1287 if (bif == NULL) 1288 return ENOENT; 1289 1290 bif->bif_path_cost = req->ifbr_path_cost; 1291 1292 if (sc->sc_if.if_flags & IFF_RUNNING) 1293 bstp_initialization(sc); 1294 1295 bridge_release_member(sc, bif, &psref); 1296 1297 return 0; 1298 } 1299 1300 /* 1301 * bridge_ifdetach: 1302 * 1303 * Detach an interface from a bridge. Called when a member 1304 * interface is detaching. 1305 */ 1306 void 1307 bridge_ifdetach(struct ifnet *ifp) 1308 { 1309 struct bridge_softc *sc = ifp->if_bridge; 1310 struct ifbreq breq; 1311 1312 /* ioctl_lock should prevent this from happening */ 1313 KASSERT(sc != NULL); 1314 1315 memset(&breq, 0, sizeof(breq)); 1316 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1317 1318 (void) bridge_ioctl_del(sc, &breq); 1319 } 1320 1321 /* 1322 * bridge_init: 1323 * 1324 * Initialize a bridge interface. 1325 */ 1326 static int 1327 bridge_init(struct ifnet *ifp) 1328 { 1329 struct bridge_softc *sc = ifp->if_softc; 1330 1331 KASSERT((ifp->if_flags & IFF_RUNNING) == 0); 1332 1333 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1334 bridge_timer, sc); 1335 bstp_initialization(sc); 1336 1337 ifp->if_flags |= IFF_RUNNING; 1338 return 0; 1339 } 1340 1341 /* 1342 * bridge_stop: 1343 * 1344 * Stop the bridge interface. 1345 */ 1346 static void 1347 bridge_stop(struct ifnet *ifp, int disable) 1348 { 1349 struct bridge_softc *sc = ifp->if_softc; 1350 1351 KASSERT((ifp->if_flags & IFF_RUNNING) != 0); 1352 ifp->if_flags &= ~IFF_RUNNING; 1353 1354 callout_stop(&sc->sc_brcallout); 1355 bstp_stop(sc); 1356 bridge_rtflush(sc, IFBF_FLUSHDYN); 1357 } 1358 1359 /* 1360 * bridge_enqueue: 1361 * 1362 * Enqueue a packet on a bridge member interface. 1363 */ 1364 void 1365 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1366 int runfilt) 1367 { 1368 int len, error; 1369 short mflags; 1370 1371 /* 1372 * Clear any in-bound checksum flags for this packet. 1373 */ 1374 m->m_pkthdr.csum_flags = 0; 1375 1376 if (runfilt) { 1377 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1378 dst_ifp, PFIL_OUT) != 0) { 1379 if (m != NULL) 1380 m_freem(m); 1381 return; 1382 } 1383 if (m == NULL) 1384 return; 1385 } 1386 1387 #ifdef ALTQ 1388 KERNEL_LOCK(1, NULL); 1389 /* 1390 * If ALTQ is enabled on the member interface, do 1391 * classification; the queueing discipline might 1392 * not require classification, but might require 1393 * the address family/header pointer in the pktattr. 1394 */ 1395 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1396 /* XXX IFT_ETHER */ 1397 altq_etherclassify(&dst_ifp->if_snd, m); 1398 } 1399 KERNEL_UNLOCK_ONE(NULL); 1400 #endif /* ALTQ */ 1401 1402 len = m->m_pkthdr.len; 1403 mflags = m->m_flags; 1404 1405 error = if_transmit_lock(dst_ifp, m); 1406 if (error) { 1407 /* mbuf is already freed */ 1408 sc->sc_if.if_oerrors++; 1409 return; 1410 } 1411 1412 sc->sc_if.if_opackets++; 1413 sc->sc_if.if_obytes += len; 1414 if (mflags & M_MCAST) 1415 sc->sc_if.if_omcasts++; 1416 } 1417 1418 /* 1419 * bridge_output: 1420 * 1421 * Send output from a bridge member interface. This 1422 * performs the bridging function for locally originated 1423 * packets. 1424 * 1425 * The mbuf has the Ethernet header already attached. We must 1426 * enqueue or free the mbuf before returning. 1427 */ 1428 int 1429 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1430 const struct rtentry *rt) 1431 { 1432 struct ether_header *eh; 1433 struct ifnet *dst_if; 1434 struct bridge_softc *sc; 1435 int s; 1436 1437 /* 1438 * bridge_output() is called from ether_output(), furthermore 1439 * ifp argument doesn't point to bridge(4). So, don't assert 1440 * IFEF_MPSAFE here. 1441 */ 1442 1443 if (m->m_len < ETHER_HDR_LEN) { 1444 m = m_pullup(m, ETHER_HDR_LEN); 1445 if (m == NULL) 1446 return 0; 1447 } 1448 1449 eh = mtod(m, struct ether_header *); 1450 sc = ifp->if_bridge; 1451 1452 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1453 if (memcmp(etherbroadcastaddr, 1454 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1455 m->m_flags |= M_BCAST; 1456 else 1457 m->m_flags |= M_MCAST; 1458 } 1459 1460 /* 1461 * If bridge is down, but the original output interface is up, 1462 * go ahead and send out that interface. Otherwise, the packet 1463 * is dropped below. 1464 */ 1465 if (__predict_false(sc == NULL) || 1466 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1467 dst_if = ifp; 1468 goto sendunicast; 1469 } 1470 1471 /* 1472 * If the packet is a multicast, or we don't know a better way to 1473 * get there, send to all interfaces. 1474 */ 1475 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0) 1476 dst_if = NULL; 1477 else 1478 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1479 if (dst_if == NULL) { 1480 /* XXX Should call bridge_broadcast, but there are locking 1481 * issues which need resolving first. */ 1482 struct bridge_iflist *bif; 1483 struct mbuf *mc; 1484 bool used = false; 1485 1486 BRIDGE_PSZ_RENTER(s); 1487 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1488 struct psref psref; 1489 1490 bridge_acquire_member(sc, bif, &psref); 1491 BRIDGE_PSZ_REXIT(s); 1492 1493 dst_if = bif->bif_ifp; 1494 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1495 goto next; 1496 1497 /* 1498 * If this is not the original output interface, 1499 * and the interface is participating in spanning 1500 * tree, make sure the port is in a state that 1501 * allows forwarding. 1502 */ 1503 if (dst_if != ifp && 1504 (bif->bif_flags & IFBIF_STP) != 0) { 1505 switch (bif->bif_state) { 1506 case BSTP_IFSTATE_BLOCKING: 1507 case BSTP_IFSTATE_LISTENING: 1508 case BSTP_IFSTATE_DISABLED: 1509 goto next; 1510 } 1511 } 1512 1513 if (PSLIST_READER_NEXT(bif, struct bridge_iflist, 1514 bif_next) == NULL && 1515 ((m->m_flags & (M_MCAST | M_BCAST)) == 0 || 1516 dst_if == ifp)) 1517 { 1518 used = true; 1519 mc = m; 1520 } else { 1521 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1522 if (mc == NULL) { 1523 sc->sc_if.if_oerrors++; 1524 goto next; 1525 } 1526 } 1527 1528 bridge_enqueue(sc, dst_if, mc, 0); 1529 1530 if ((m->m_flags & (M_MCAST | M_BCAST)) != 0 && 1531 dst_if != ifp) 1532 { 1533 if (PSLIST_READER_NEXT(bif, 1534 struct bridge_iflist, bif_next) == NULL) 1535 { 1536 used = true; 1537 mc = m; 1538 } else { 1539 mc = m_copym(m, 0, M_COPYALL, 1540 M_DONTWAIT); 1541 if (mc == NULL) { 1542 sc->sc_if.if_oerrors++; 1543 goto next; 1544 } 1545 } 1546 1547 m_set_rcvif(mc, dst_if); 1548 mc->m_flags &= ~M_PROMISC; 1549 1550 #ifndef NET_MPSAFE 1551 s = splsoftnet(); 1552 #endif 1553 ether_input(dst_if, mc); 1554 #ifndef NET_MPSAFE 1555 splx(s); 1556 #endif 1557 } 1558 1559 next: 1560 BRIDGE_PSZ_RENTER(s); 1561 bridge_release_member(sc, bif, &psref); 1562 1563 /* Guarantee we don't re-enter the loop as we already 1564 * decided we're at the end. */ 1565 if (used) 1566 break; 1567 } 1568 BRIDGE_PSZ_REXIT(s); 1569 1570 if (!used) 1571 m_freem(m); 1572 return 0; 1573 } 1574 1575 sendunicast: 1576 /* 1577 * XXX Spanning tree consideration here? 1578 */ 1579 1580 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1581 m_freem(m); 1582 return 0; 1583 } 1584 1585 bridge_enqueue(sc, dst_if, m, 0); 1586 1587 return 0; 1588 } 1589 1590 /* 1591 * bridge_start: 1592 * 1593 * Start output on a bridge. 1594 * 1595 * NOTE: This routine should never be called in this implementation. 1596 */ 1597 static void 1598 bridge_start(struct ifnet *ifp) 1599 { 1600 1601 printf("%s: bridge_start() called\n", ifp->if_xname); 1602 } 1603 1604 /* 1605 * bridge_forward: 1606 * 1607 * The forwarding function of the bridge. 1608 */ 1609 static void 1610 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1611 { 1612 struct bridge_iflist *bif; 1613 struct ifnet *src_if, *dst_if; 1614 struct ether_header *eh; 1615 struct psref psref; 1616 struct psref psref_src; 1617 DECLARE_LOCK_VARIABLE; 1618 1619 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1620 return; 1621 1622 src_if = m_get_rcvif_psref(m, &psref_src); 1623 if (src_if == NULL) { 1624 /* Interface is being destroyed? */ 1625 m_freem(m); 1626 goto out; 1627 } 1628 1629 sc->sc_if.if_ipackets++; 1630 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1631 1632 /* 1633 * Look up the bridge_iflist. 1634 */ 1635 bif = bridge_lookup_member_if(sc, src_if, &psref); 1636 if (bif == NULL) { 1637 /* Interface is not a bridge member (anymore?) */ 1638 m_freem(m); 1639 goto out; 1640 } 1641 1642 if (bif->bif_flags & IFBIF_STP) { 1643 switch (bif->bif_state) { 1644 case BSTP_IFSTATE_BLOCKING: 1645 case BSTP_IFSTATE_LISTENING: 1646 case BSTP_IFSTATE_DISABLED: 1647 m_freem(m); 1648 bridge_release_member(sc, bif, &psref); 1649 goto out; 1650 } 1651 } 1652 1653 eh = mtod(m, struct ether_header *); 1654 1655 /* 1656 * If the interface is learning, and the source 1657 * address is valid and not multicast, record 1658 * the address. 1659 */ 1660 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1661 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1662 (eh->ether_shost[0] == 0 && 1663 eh->ether_shost[1] == 0 && 1664 eh->ether_shost[2] == 0 && 1665 eh->ether_shost[3] == 0 && 1666 eh->ether_shost[4] == 0 && 1667 eh->ether_shost[5] == 0) == 0) { 1668 (void) bridge_rtupdate(sc, eh->ether_shost, 1669 src_if, 0, IFBAF_DYNAMIC); 1670 } 1671 1672 if ((bif->bif_flags & IFBIF_STP) != 0 && 1673 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1674 m_freem(m); 1675 bridge_release_member(sc, bif, &psref); 1676 goto out; 1677 } 1678 1679 bridge_release_member(sc, bif, &psref); 1680 1681 /* 1682 * At this point, the port either doesn't participate 1683 * in spanning tree or it is in the forwarding state. 1684 */ 1685 1686 /* 1687 * If the packet is unicast, destined for someone on 1688 * "this" side of the bridge, drop it. 1689 */ 1690 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1691 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1692 if (src_if == dst_if) { 1693 m_freem(m); 1694 goto out; 1695 } 1696 } else { 1697 /* ...forward it to all interfaces. */ 1698 sc->sc_if.if_imcasts++; 1699 dst_if = NULL; 1700 } 1701 1702 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, src_if, PFIL_IN) != 0) { 1703 if (m != NULL) 1704 m_freem(m); 1705 goto out; 1706 } 1707 if (m == NULL) 1708 goto out; 1709 1710 if (dst_if == NULL) { 1711 bridge_broadcast(sc, src_if, m); 1712 goto out; 1713 } 1714 1715 m_put_rcvif_psref(src_if, &psref_src); 1716 src_if = NULL; 1717 1718 /* 1719 * At this point, we're dealing with a unicast frame 1720 * going to a different interface. 1721 */ 1722 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1723 m_freem(m); 1724 goto out; 1725 } 1726 1727 bif = bridge_lookup_member_if(sc, dst_if, &psref); 1728 if (bif == NULL) { 1729 /* Not a member of the bridge (anymore?) */ 1730 m_freem(m); 1731 goto out; 1732 } 1733 1734 if (bif->bif_flags & IFBIF_STP) { 1735 switch (bif->bif_state) { 1736 case BSTP_IFSTATE_DISABLED: 1737 case BSTP_IFSTATE_BLOCKING: 1738 m_freem(m); 1739 bridge_release_member(sc, bif, &psref); 1740 goto out; 1741 } 1742 } 1743 1744 bridge_release_member(sc, bif, &psref); 1745 1746 ACQUIRE_GLOBAL_LOCKS(); 1747 bridge_enqueue(sc, dst_if, m, 1); 1748 RELEASE_GLOBAL_LOCKS(); 1749 out: 1750 if (src_if != NULL) 1751 m_put_rcvif_psref(src_if, &psref_src); 1752 return; 1753 } 1754 1755 static bool 1756 bstp_state_before_learning(struct bridge_iflist *bif) 1757 { 1758 if (bif->bif_flags & IFBIF_STP) { 1759 switch (bif->bif_state) { 1760 case BSTP_IFSTATE_BLOCKING: 1761 case BSTP_IFSTATE_LISTENING: 1762 case BSTP_IFSTATE_DISABLED: 1763 return true; 1764 } 1765 } 1766 return false; 1767 } 1768 1769 static bool 1770 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1771 { 1772 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1773 1774 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1775 #if NCARP > 0 1776 || (bif->bif_ifp->if_carp && 1777 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1778 #endif /* NCARP > 0 */ 1779 ) 1780 return true; 1781 1782 return false; 1783 } 1784 1785 /* 1786 * bridge_input: 1787 * 1788 * Receive input from a member interface. Queue the packet for 1789 * bridging if it is not for us. 1790 */ 1791 static void 1792 bridge_input(struct ifnet *ifp, struct mbuf *m) 1793 { 1794 struct bridge_softc *sc = ifp->if_bridge; 1795 struct bridge_iflist *bif; 1796 struct ether_header *eh; 1797 struct psref psref; 1798 int bound; 1799 DECLARE_LOCK_VARIABLE; 1800 1801 KASSERT(!cpu_intr_p()); 1802 1803 if (__predict_false(sc == NULL) || 1804 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1805 ACQUIRE_GLOBAL_LOCKS(); 1806 ether_input(ifp, m); 1807 RELEASE_GLOBAL_LOCKS(); 1808 return; 1809 } 1810 1811 bound = curlwp_bind(); 1812 bif = bridge_lookup_member_if(sc, ifp, &psref); 1813 if (bif == NULL) { 1814 curlwp_bindx(bound); 1815 ACQUIRE_GLOBAL_LOCKS(); 1816 ether_input(ifp, m); 1817 RELEASE_GLOBAL_LOCKS(); 1818 return; 1819 } 1820 1821 eh = mtod(m, struct ether_header *); 1822 1823 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1824 if (memcmp(etherbroadcastaddr, 1825 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1826 m->m_flags |= M_BCAST; 1827 else 1828 m->m_flags |= M_MCAST; 1829 } 1830 1831 /* 1832 * A 'fast' path for packets addressed to interfaces that are 1833 * part of this bridge. 1834 */ 1835 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 1836 !bstp_state_before_learning(bif)) { 1837 struct bridge_iflist *_bif; 1838 struct ifnet *_ifp = NULL; 1839 int s; 1840 struct psref _psref; 1841 1842 BRIDGE_PSZ_RENTER(s); 1843 BRIDGE_IFLIST_READER_FOREACH(_bif, sc) { 1844 /* It is destined for us. */ 1845 if (bridge_ourether(_bif, eh, 0)) { 1846 bridge_acquire_member(sc, _bif, &_psref); 1847 BRIDGE_PSZ_REXIT(s); 1848 if (_bif->bif_flags & IFBIF_LEARNING) 1849 (void) bridge_rtupdate(sc, 1850 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1851 m_set_rcvif(m, _bif->bif_ifp); 1852 _ifp = _bif->bif_ifp; 1853 bridge_release_member(sc, _bif, &_psref); 1854 goto out; 1855 } 1856 1857 /* We just received a packet that we sent out. */ 1858 if (bridge_ourether(_bif, eh, 1)) 1859 break; 1860 } 1861 BRIDGE_PSZ_REXIT(s); 1862 out: 1863 1864 if (_bif != NULL) { 1865 bridge_release_member(sc, bif, &psref); 1866 curlwp_bindx(bound); 1867 if (_ifp != NULL) { 1868 m->m_flags &= ~M_PROMISC; 1869 ACQUIRE_GLOBAL_LOCKS(); 1870 ether_input(_ifp, m); 1871 RELEASE_GLOBAL_LOCKS(); 1872 } else 1873 m_freem(m); 1874 return; 1875 } 1876 } 1877 1878 /* Tap off 802.1D packets; they do not get forwarded. */ 1879 if (bif->bif_flags & IFBIF_STP && 1880 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 1881 bstp_input(sc, bif, m); 1882 bridge_release_member(sc, bif, &psref); 1883 curlwp_bindx(bound); 1884 return; 1885 } 1886 1887 /* 1888 * A normal switch would discard the packet here, but that's not what 1889 * we've done historically. This also prevents some obnoxious behaviour. 1890 */ 1891 if (bstp_state_before_learning(bif)) { 1892 bridge_release_member(sc, bif, &psref); 1893 curlwp_bindx(bound); 1894 ACQUIRE_GLOBAL_LOCKS(); 1895 ether_input(ifp, m); 1896 RELEASE_GLOBAL_LOCKS(); 1897 return; 1898 } 1899 1900 bridge_release_member(sc, bif, &psref); 1901 1902 bridge_forward(sc, m); 1903 1904 curlwp_bindx(bound); 1905 } 1906 1907 /* 1908 * bridge_broadcast: 1909 * 1910 * Send a frame to all interfaces that are members of 1911 * the bridge, except for the one on which the packet 1912 * arrived. 1913 */ 1914 static void 1915 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1916 struct mbuf *m) 1917 { 1918 struct bridge_iflist *bif; 1919 struct mbuf *mc; 1920 struct ifnet *dst_if; 1921 bool bmcast; 1922 int s; 1923 DECLARE_LOCK_VARIABLE; 1924 1925 bmcast = m->m_flags & (M_BCAST|M_MCAST); 1926 1927 BRIDGE_PSZ_RENTER(s); 1928 BRIDGE_IFLIST_READER_FOREACH(bif, sc) { 1929 struct psref psref; 1930 1931 bridge_acquire_member(sc, bif, &psref); 1932 BRIDGE_PSZ_REXIT(s); 1933 1934 dst_if = bif->bif_ifp; 1935 1936 if (bif->bif_flags & IFBIF_STP) { 1937 switch (bif->bif_state) { 1938 case BSTP_IFSTATE_BLOCKING: 1939 case BSTP_IFSTATE_DISABLED: 1940 goto next; 1941 } 1942 } 1943 1944 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 1945 goto next; 1946 1947 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1948 goto next; 1949 1950 if (dst_if != src_if) { 1951 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1952 if (mc == NULL) { 1953 sc->sc_if.if_oerrors++; 1954 goto next; 1955 } 1956 ACQUIRE_GLOBAL_LOCKS(); 1957 bridge_enqueue(sc, dst_if, mc, 1); 1958 RELEASE_GLOBAL_LOCKS(); 1959 } 1960 1961 if (bmcast) { 1962 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1963 if (mc == NULL) { 1964 sc->sc_if.if_oerrors++; 1965 goto next; 1966 } 1967 1968 m_set_rcvif(mc, dst_if); 1969 mc->m_flags &= ~M_PROMISC; 1970 1971 ACQUIRE_GLOBAL_LOCKS(); 1972 ether_input(dst_if, mc); 1973 RELEASE_GLOBAL_LOCKS(); 1974 } 1975 next: 1976 BRIDGE_PSZ_RENTER(s); 1977 bridge_release_member(sc, bif, &psref); 1978 } 1979 BRIDGE_PSZ_REXIT(s); 1980 1981 m_freem(m); 1982 } 1983 1984 static int 1985 bridge_rtalloc(struct bridge_softc *sc, const uint8_t *dst, 1986 struct bridge_rtnode **brtp) 1987 { 1988 struct bridge_rtnode *brt; 1989 int error; 1990 1991 if (sc->sc_brtcnt >= sc->sc_brtmax) 1992 return ENOSPC; 1993 1994 /* 1995 * Allocate a new bridge forwarding node, and 1996 * initialize the expiration time and Ethernet 1997 * address. 1998 */ 1999 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 2000 if (brt == NULL) 2001 return ENOMEM; 2002 2003 memset(brt, 0, sizeof(*brt)); 2004 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2005 brt->brt_flags = IFBAF_DYNAMIC; 2006 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2007 2008 BRIDGE_RT_LOCK(sc); 2009 error = bridge_rtnode_insert(sc, brt); 2010 BRIDGE_RT_UNLOCK(sc); 2011 2012 if (error != 0) { 2013 pool_put(&bridge_rtnode_pool, brt); 2014 return error; 2015 } 2016 2017 *brtp = brt; 2018 return 0; 2019 } 2020 2021 /* 2022 * bridge_rtupdate: 2023 * 2024 * Add a bridge routing entry. 2025 */ 2026 static int 2027 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 2028 struct ifnet *dst_if, int setflags, uint8_t flags) 2029 { 2030 struct bridge_rtnode *brt; 2031 int s; 2032 2033 again: 2034 /* 2035 * A route for this destination might already exist. If so, 2036 * update it, otherwise create a new one. 2037 */ 2038 BRIDGE_RT_RENTER(s); 2039 brt = bridge_rtnode_lookup(sc, dst); 2040 2041 if (brt != NULL) { 2042 brt->brt_ifp = dst_if; 2043 if (setflags) { 2044 brt->brt_flags = flags; 2045 if (flags & IFBAF_STATIC) 2046 brt->brt_expire = 0; 2047 else 2048 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2049 } else { 2050 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2051 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2052 } 2053 } 2054 BRIDGE_RT_REXIT(s); 2055 2056 if (brt == NULL) { 2057 int r; 2058 2059 r = bridge_rtalloc(sc, dst, &brt); 2060 if (r != 0) 2061 return r; 2062 goto again; 2063 } 2064 2065 return 0; 2066 } 2067 2068 /* 2069 * bridge_rtlookup: 2070 * 2071 * Lookup the destination interface for an address. 2072 */ 2073 static struct ifnet * 2074 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2075 { 2076 struct bridge_rtnode *brt; 2077 struct ifnet *ifs = NULL; 2078 int s; 2079 2080 BRIDGE_RT_RENTER(s); 2081 brt = bridge_rtnode_lookup(sc, addr); 2082 if (brt != NULL) 2083 ifs = brt->brt_ifp; 2084 BRIDGE_RT_REXIT(s); 2085 2086 return ifs; 2087 } 2088 2089 typedef bool (*bridge_iterate_cb_t) 2090 (struct bridge_softc *, struct bridge_rtnode *, bool *, void *); 2091 2092 /* 2093 * bridge_rtlist_iterate_remove: 2094 * 2095 * It iterates on sc->sc_rtlist and removes rtnodes of it which func 2096 * callback judges to remove. Removals of rtnodes are done in a manner 2097 * of pserialize. To this end, all kmem_* operations are placed out of 2098 * mutexes. 2099 */ 2100 static void 2101 bridge_rtlist_iterate_remove(struct bridge_softc *sc, bridge_iterate_cb_t func, void *arg) 2102 { 2103 struct bridge_rtnode *brt, *nbrt; 2104 struct bridge_rtnode **brt_list; 2105 int i, count; 2106 2107 retry: 2108 count = sc->sc_brtcnt; 2109 if (count == 0) 2110 return; 2111 brt_list = kmem_alloc(sizeof(*brt_list) * count, KM_SLEEP); 2112 2113 BRIDGE_RT_LOCK(sc); 2114 if (__predict_false(sc->sc_brtcnt > count)) { 2115 /* The rtnodes increased, we need more memory */ 2116 BRIDGE_RT_UNLOCK(sc); 2117 kmem_free(brt_list, sizeof(*brt_list) * count); 2118 goto retry; 2119 } 2120 2121 i = 0; 2122 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2123 bool need_break = false; 2124 if (func(sc, brt, &need_break, arg)) { 2125 bridge_rtnode_remove(sc, brt); 2126 brt_list[i++] = brt; 2127 } 2128 if (need_break) 2129 break; 2130 } 2131 2132 if (i > 0) 2133 BRIDGE_RT_PSZ_PERFORM(sc); 2134 BRIDGE_RT_UNLOCK(sc); 2135 2136 while (--i >= 0) 2137 bridge_rtnode_destroy(brt_list[i]); 2138 2139 kmem_free(brt_list, sizeof(*brt_list) * count); 2140 } 2141 2142 static bool 2143 bridge_rttrim0_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2144 bool *need_break, void *arg) 2145 { 2146 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2147 /* Take into account of the subsequent removal */ 2148 if ((sc->sc_brtcnt - 1) <= sc->sc_brtmax) 2149 *need_break = true; 2150 return true; 2151 } else 2152 return false; 2153 } 2154 2155 static void 2156 bridge_rttrim0(struct bridge_softc *sc) 2157 { 2158 bridge_rtlist_iterate_remove(sc, bridge_rttrim0_cb, NULL); 2159 } 2160 2161 /* 2162 * bridge_rttrim: 2163 * 2164 * Trim the routine table so that we have a number 2165 * of routing entries less than or equal to the 2166 * maximum number. 2167 */ 2168 static void 2169 bridge_rttrim(struct bridge_softc *sc) 2170 { 2171 2172 /* Make sure we actually need to do this. */ 2173 if (sc->sc_brtcnt <= sc->sc_brtmax) 2174 return; 2175 2176 /* Force an aging cycle; this might trim enough addresses. */ 2177 bridge_rtage(sc); 2178 if (sc->sc_brtcnt <= sc->sc_brtmax) 2179 return; 2180 2181 bridge_rttrim0(sc); 2182 2183 return; 2184 } 2185 2186 /* 2187 * bridge_timer: 2188 * 2189 * Aging timer for the bridge. 2190 */ 2191 static void 2192 bridge_timer(void *arg) 2193 { 2194 struct bridge_softc *sc = arg; 2195 2196 workqueue_enqueue(sc->sc_rtage_wq, &sc->sc_rtage_wk, NULL); 2197 } 2198 2199 static void 2200 bridge_rtage_work(struct work *wk, void *arg) 2201 { 2202 struct bridge_softc *sc = arg; 2203 2204 KASSERT(wk == &sc->sc_rtage_wk); 2205 2206 bridge_rtage(sc); 2207 2208 if (sc->sc_if.if_flags & IFF_RUNNING) 2209 callout_reset(&sc->sc_brcallout, 2210 bridge_rtable_prune_period * hz, bridge_timer, sc); 2211 } 2212 2213 static bool 2214 bridge_rtage_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2215 bool *need_break, void *arg) 2216 { 2217 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2218 time_uptime >= brt->brt_expire) 2219 return true; 2220 else 2221 return false; 2222 } 2223 2224 /* 2225 * bridge_rtage: 2226 * 2227 * Perform an aging cycle. 2228 */ 2229 static void 2230 bridge_rtage(struct bridge_softc *sc) 2231 { 2232 bridge_rtlist_iterate_remove(sc, bridge_rtage_cb, NULL); 2233 } 2234 2235 2236 static bool 2237 bridge_rtflush_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2238 bool *need_break, void *arg) 2239 { 2240 int full = *(int*)arg; 2241 2242 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2243 return true; 2244 else 2245 return false; 2246 } 2247 2248 /* 2249 * bridge_rtflush: 2250 * 2251 * Remove all dynamic addresses from the bridge. 2252 */ 2253 static void 2254 bridge_rtflush(struct bridge_softc *sc, int full) 2255 { 2256 bridge_rtlist_iterate_remove(sc, bridge_rtflush_cb, &full); 2257 } 2258 2259 /* 2260 * bridge_rtdaddr: 2261 * 2262 * Remove an address from the table. 2263 */ 2264 static int 2265 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2266 { 2267 struct bridge_rtnode *brt; 2268 2269 BRIDGE_RT_LOCK(sc); 2270 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2271 BRIDGE_RT_UNLOCK(sc); 2272 return ENOENT; 2273 } 2274 bridge_rtnode_remove(sc, brt); 2275 BRIDGE_RT_PSZ_PERFORM(sc); 2276 BRIDGE_RT_UNLOCK(sc); 2277 2278 bridge_rtnode_destroy(brt); 2279 2280 return 0; 2281 } 2282 2283 /* 2284 * bridge_rtdelete: 2285 * 2286 * Delete routes to a speicifc member interface. 2287 */ 2288 static void 2289 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2290 { 2291 struct bridge_rtnode *brt; 2292 2293 BRIDGE_RT_LOCK(sc); 2294 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2295 if (brt->brt_ifp == ifp) 2296 break; 2297 } 2298 if (brt == NULL) { 2299 BRIDGE_RT_UNLOCK(sc); 2300 return; 2301 } 2302 bridge_rtnode_remove(sc, brt); 2303 BRIDGE_RT_PSZ_PERFORM(sc); 2304 BRIDGE_RT_UNLOCK(sc); 2305 2306 bridge_rtnode_destroy(brt); 2307 } 2308 2309 /* 2310 * bridge_rtable_init: 2311 * 2312 * Initialize the route table for this bridge. 2313 */ 2314 static void 2315 bridge_rtable_init(struct bridge_softc *sc) 2316 { 2317 int i; 2318 2319 sc->sc_rthash = kmem_alloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2320 KM_SLEEP); 2321 2322 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2323 LIST_INIT(&sc->sc_rthash[i]); 2324 2325 sc->sc_rthash_key = cprng_fast32(); 2326 2327 LIST_INIT(&sc->sc_rtlist); 2328 2329 sc->sc_rtlist_psz = pserialize_create(); 2330 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 2331 } 2332 2333 /* 2334 * bridge_rtable_fini: 2335 * 2336 * Deconstruct the route table for this bridge. 2337 */ 2338 static void 2339 bridge_rtable_fini(struct bridge_softc *sc) 2340 { 2341 2342 kmem_free(sc->sc_rthash, sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE); 2343 if (sc->sc_rtlist_lock) 2344 mutex_obj_free(sc->sc_rtlist_lock); 2345 if (sc->sc_rtlist_psz) 2346 pserialize_destroy(sc->sc_rtlist_psz); 2347 } 2348 2349 /* 2350 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2351 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2352 */ 2353 #define mix(a, b, c) \ 2354 do { \ 2355 a -= b; a -= c; a ^= (c >> 13); \ 2356 b -= c; b -= a; b ^= (a << 8); \ 2357 c -= a; c -= b; c ^= (b >> 13); \ 2358 a -= b; a -= c; a ^= (c >> 12); \ 2359 b -= c; b -= a; b ^= (a << 16); \ 2360 c -= a; c -= b; c ^= (b >> 5); \ 2361 a -= b; a -= c; a ^= (c >> 3); \ 2362 b -= c; b -= a; b ^= (a << 10); \ 2363 c -= a; c -= b; c ^= (b >> 15); \ 2364 } while (/*CONSTCOND*/0) 2365 2366 static inline uint32_t 2367 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2368 { 2369 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2370 2371 b += addr[5] << 8; 2372 b += addr[4]; 2373 a += addr[3] << 24; 2374 a += addr[2] << 16; 2375 a += addr[1] << 8; 2376 a += addr[0]; 2377 2378 mix(a, b, c); 2379 2380 return (c & BRIDGE_RTHASH_MASK); 2381 } 2382 2383 #undef mix 2384 2385 /* 2386 * bridge_rtnode_lookup: 2387 * 2388 * Look up a bridge route node for the specified destination. 2389 */ 2390 static struct bridge_rtnode * 2391 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2392 { 2393 struct bridge_rtnode *brt; 2394 uint32_t hash; 2395 int dir; 2396 2397 hash = bridge_rthash(sc, addr); 2398 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2399 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2400 if (dir == 0) 2401 return brt; 2402 if (dir > 0) 2403 return NULL; 2404 } 2405 2406 return NULL; 2407 } 2408 2409 /* 2410 * bridge_rtnode_insert: 2411 * 2412 * Insert the specified bridge node into the route table. We 2413 * assume the entry is not already in the table. 2414 */ 2415 static int 2416 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2417 { 2418 struct bridge_rtnode *lbrt; 2419 uint32_t hash; 2420 int dir; 2421 2422 KASSERT(BRIDGE_RT_LOCKED(sc)); 2423 2424 hash = bridge_rthash(sc, brt->brt_addr); 2425 2426 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2427 if (lbrt == NULL) { 2428 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2429 goto out; 2430 } 2431 2432 do { 2433 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2434 if (dir == 0) 2435 return EEXIST; 2436 if (dir > 0) { 2437 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2438 goto out; 2439 } 2440 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2441 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2442 goto out; 2443 } 2444 lbrt = LIST_NEXT(lbrt, brt_hash); 2445 } while (lbrt != NULL); 2446 2447 #ifdef DIAGNOSTIC 2448 panic("bridge_rtnode_insert: impossible"); 2449 #endif 2450 2451 out: 2452 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2453 sc->sc_brtcnt++; 2454 2455 return 0; 2456 } 2457 2458 /* 2459 * bridge_rtnode_remove: 2460 * 2461 * Remove a bridge rtnode from the rthash and the rtlist of a bridge. 2462 */ 2463 static void 2464 bridge_rtnode_remove(struct bridge_softc *sc, struct bridge_rtnode *brt) 2465 { 2466 2467 KASSERT(BRIDGE_RT_LOCKED(sc)); 2468 2469 LIST_REMOVE(brt, brt_hash); 2470 LIST_REMOVE(brt, brt_list); 2471 sc->sc_brtcnt--; 2472 } 2473 2474 /* 2475 * bridge_rtnode_destroy: 2476 * 2477 * Destroy a bridge rtnode. 2478 */ 2479 static void 2480 bridge_rtnode_destroy(struct bridge_rtnode *brt) 2481 { 2482 2483 pool_put(&bridge_rtnode_pool, brt); 2484 } 2485 2486 #if defined(BRIDGE_IPF) 2487 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2488 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2489 2490 /* 2491 * Send bridge packets through IPF if they are one of the types IPF can deal 2492 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2493 * question.) 2494 */ 2495 static int 2496 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2497 { 2498 int snap, error; 2499 struct ether_header *eh1, eh2; 2500 struct llc llc1; 2501 uint16_t ether_type; 2502 2503 snap = 0; 2504 error = -1; /* Default error if not error == 0 */ 2505 eh1 = mtod(*mp, struct ether_header *); 2506 ether_type = ntohs(eh1->ether_type); 2507 2508 /* 2509 * Check for SNAP/LLC. 2510 */ 2511 if (ether_type < ETHERMTU) { 2512 struct llc *llc2 = (struct llc *)(eh1 + 1); 2513 2514 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2515 llc2->llc_dsap == LLC_SNAP_LSAP && 2516 llc2->llc_ssap == LLC_SNAP_LSAP && 2517 llc2->llc_control == LLC_UI) { 2518 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2519 snap = 1; 2520 } 2521 } 2522 2523 /* 2524 * If we're trying to filter bridge traffic, don't look at anything 2525 * other than IP and ARP traffic. If the filter doesn't understand 2526 * IPv6, don't allow IPv6 through the bridge either. This is lame 2527 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2528 * but of course we don't have an AppleTalk filter to begin with. 2529 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2530 * ARP traffic.) 2531 */ 2532 switch (ether_type) { 2533 case ETHERTYPE_ARP: 2534 case ETHERTYPE_REVARP: 2535 return 0; /* Automatically pass */ 2536 case ETHERTYPE_IP: 2537 # ifdef INET6 2538 case ETHERTYPE_IPV6: 2539 # endif /* INET6 */ 2540 break; 2541 default: 2542 goto bad; 2543 } 2544 2545 /* Strip off the Ethernet header and keep a copy. */ 2546 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2547 m_adj(*mp, ETHER_HDR_LEN); 2548 2549 /* Strip off snap header, if present */ 2550 if (snap) { 2551 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2552 m_adj(*mp, sizeof(struct llc)); 2553 } 2554 2555 /* 2556 * Check basic packet sanity and run IPF through pfil. 2557 */ 2558 KASSERT(!cpu_intr_p()); 2559 switch (ether_type) 2560 { 2561 case ETHERTYPE_IP : 2562 error = bridge_ip_checkbasic(mp); 2563 if (error == 0) 2564 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2565 break; 2566 # ifdef INET6 2567 case ETHERTYPE_IPV6 : 2568 error = bridge_ip6_checkbasic(mp); 2569 if (error == 0) 2570 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2571 break; 2572 # endif 2573 default : 2574 error = 0; 2575 break; 2576 } 2577 2578 if (*mp == NULL) 2579 return error; 2580 if (error != 0) 2581 goto bad; 2582 2583 error = -1; 2584 2585 /* 2586 * Finally, put everything back the way it was and return 2587 */ 2588 if (snap) { 2589 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2590 if (*mp == NULL) 2591 return error; 2592 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2593 } 2594 2595 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2596 if (*mp == NULL) 2597 return error; 2598 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2599 2600 return 0; 2601 2602 bad: 2603 m_freem(*mp); 2604 *mp = NULL; 2605 return error; 2606 } 2607 2608 /* 2609 * Perform basic checks on header size since 2610 * IPF assumes ip_input has already processed 2611 * it for it. Cut-and-pasted from ip_input.c. 2612 * Given how simple the IPv6 version is, 2613 * does the IPv4 version really need to be 2614 * this complicated? 2615 * 2616 * XXX Should we update ipstat here, or not? 2617 * XXX Right now we update ipstat but not 2618 * XXX csum_counter. 2619 */ 2620 static int 2621 bridge_ip_checkbasic(struct mbuf **mp) 2622 { 2623 struct mbuf *m = *mp; 2624 struct ip *ip; 2625 int len, hlen; 2626 2627 if (*mp == NULL) 2628 return -1; 2629 2630 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2631 if ((m = m_copyup(m, sizeof(struct ip), 2632 (max_linkhdr + 3) & ~3)) == NULL) { 2633 /* XXXJRT new stat, please */ 2634 ip_statinc(IP_STAT_TOOSMALL); 2635 goto bad; 2636 } 2637 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2638 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2639 ip_statinc(IP_STAT_TOOSMALL); 2640 goto bad; 2641 } 2642 } 2643 ip = mtod(m, struct ip *); 2644 if (ip == NULL) goto bad; 2645 2646 if (ip->ip_v != IPVERSION) { 2647 ip_statinc(IP_STAT_BADVERS); 2648 goto bad; 2649 } 2650 hlen = ip->ip_hl << 2; 2651 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2652 ip_statinc(IP_STAT_BADHLEN); 2653 goto bad; 2654 } 2655 if (hlen > m->m_len) { 2656 if ((m = m_pullup(m, hlen)) == 0) { 2657 ip_statinc(IP_STAT_BADHLEN); 2658 goto bad; 2659 } 2660 ip = mtod(m, struct ip *); 2661 if (ip == NULL) goto bad; 2662 } 2663 2664 switch (m->m_pkthdr.csum_flags & 2665 ((m_get_rcvif_NOMPSAFE(m)->if_csum_flags_rx & M_CSUM_IPv4) | 2666 M_CSUM_IPv4_BAD)) { 2667 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2668 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2669 goto bad; 2670 2671 case M_CSUM_IPv4: 2672 /* Checksum was okay. */ 2673 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2674 break; 2675 2676 default: 2677 /* Must compute it ourselves. */ 2678 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2679 if (in_cksum(m, hlen) != 0) 2680 goto bad; 2681 break; 2682 } 2683 2684 /* Retrieve the packet length. */ 2685 len = ntohs(ip->ip_len); 2686 2687 /* 2688 * Check for additional length bogosity 2689 */ 2690 if (len < hlen) { 2691 ip_statinc(IP_STAT_BADLEN); 2692 goto bad; 2693 } 2694 2695 /* 2696 * Check that the amount of data in the buffers 2697 * is as at least much as the IP header would have us expect. 2698 * Drop packet if shorter than we expect. 2699 */ 2700 if (m->m_pkthdr.len < len) { 2701 ip_statinc(IP_STAT_TOOSHORT); 2702 goto bad; 2703 } 2704 2705 /* Checks out, proceed */ 2706 *mp = m; 2707 return 0; 2708 2709 bad: 2710 *mp = m; 2711 return -1; 2712 } 2713 2714 # ifdef INET6 2715 /* 2716 * Same as above, but for IPv6. 2717 * Cut-and-pasted from ip6_input.c. 2718 * XXX Should we update ip6stat, or not? 2719 */ 2720 static int 2721 bridge_ip6_checkbasic(struct mbuf **mp) 2722 { 2723 struct mbuf *m = *mp; 2724 struct ip6_hdr *ip6; 2725 2726 /* 2727 * If the IPv6 header is not aligned, slurp it up into a new 2728 * mbuf with space for link headers, in the event we forward 2729 * it. Otherwise, if it is aligned, make sure the entire base 2730 * IPv6 header is in the first mbuf of the chain. 2731 */ 2732 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2733 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2734 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2735 (max_linkhdr + 3) & ~3)) == NULL) { 2736 /* XXXJRT new stat, please */ 2737 ip6_statinc(IP6_STAT_TOOSMALL); 2738 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2739 goto bad; 2740 } 2741 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2742 struct ifnet *inifp = m_get_rcvif_NOMPSAFE(m); 2743 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2744 ip6_statinc(IP6_STAT_TOOSMALL); 2745 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2746 goto bad; 2747 } 2748 } 2749 2750 ip6 = mtod(m, struct ip6_hdr *); 2751 2752 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2753 ip6_statinc(IP6_STAT_BADVERS); 2754 in6_ifstat_inc(m_get_rcvif_NOMPSAFE(m), ifs6_in_hdrerr); 2755 goto bad; 2756 } 2757 2758 /* Checks out, proceed */ 2759 *mp = m; 2760 return 0; 2761 2762 bad: 2763 *mp = m; 2764 return -1; 2765 } 2766 # endif /* INET6 */ 2767 #endif /* BRIDGE_IPF */ 2768
Indexes created Tue Sep 23 14:10:03 GMT 2025