1 /* $NetBSD: if_bridge.c,v 1.102 2015/08/28 14:23:18 rjs Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) 40 * All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by Jason L. Wright 53 * 4. The name of the author may not be used to endorse or promote products 54 * derived from this software without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 57 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 58 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 59 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 60 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 61 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 62 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 64 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 65 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 66 * POSSIBILITY OF SUCH DAMAGE. 67 * 68 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 69 */ 70 71 /* 72 * Network interface bridge support. 73 * 74 * TODO: 75 * 76 * - Currently only supports Ethernet-like interfaces (Ethernet, 77 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 78 * to bridge other types of interfaces (FDDI-FDDI, and maybe 79 * consider heterogenous bridges). 80 */ 81 82 #include <sys/cdefs.h> 83 __KERNEL_RCSID(0, "$NetBSD: if_bridge.c,v 1.102 2015/08/28 14:23:18 rjs Exp $"); 84 85 #ifdef _KERNEL_OPT 86 #include "opt_bridge_ipf.h" 87 #include "opt_inet.h" 88 #endif /* _KERNEL_OPT */ 89 90 #include <sys/param.h> 91 #include <sys/kernel.h> 92 #include <sys/mbuf.h> 93 #include <sys/queue.h> 94 #include <sys/socket.h> 95 #include <sys/socketvar.h> /* for softnet_lock */ 96 #include <sys/sockio.h> 97 #include <sys/systm.h> 98 #include <sys/proc.h> 99 #include <sys/pool.h> 100 #include <sys/kauth.h> 101 #include <sys/cpu.h> 102 #include <sys/cprng.h> 103 #include <sys/mutex.h> 104 #include <sys/kmem.h> 105 106 #include <net/bpf.h> 107 #include <net/if.h> 108 #include <net/if_dl.h> 109 #include <net/if_types.h> 110 #include <net/if_llc.h> 111 #include <net/pktqueue.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_INTR_LOCK(_sc) mutex_enter((_sc)->sc_rtlist_intr_lock) 185 #define BRIDGE_RT_INTR_UNLOCK(_sc) mutex_exit((_sc)->sc_rtlist_intr_lock) 186 #define BRIDGE_RT_INTR_LOCKED(_sc) mutex_owned((_sc)->sc_rtlist_intr_lock) 187 188 #define BRIDGE_RT_LOCK(_sc) if ((_sc)->sc_rtlist_lock) \ 189 mutex_enter((_sc)->sc_rtlist_lock) 190 #define BRIDGE_RT_UNLOCK(_sc) if ((_sc)->sc_rtlist_lock) \ 191 mutex_exit((_sc)->sc_rtlist_lock) 192 #define BRIDGE_RT_LOCKED(_sc) (!(_sc)->sc_rtlist_lock || \ 193 mutex_owned((_sc)->sc_rtlist_lock)) 194 195 #define BRIDGE_RT_PSZ_PERFORM(_sc) \ 196 if ((_sc)->sc_rtlist_psz != NULL) \ 197 pserialize_perform((_sc)->sc_rtlist_psz); 198 199 #ifdef BRIDGE_MPSAFE 200 #define BRIDGE_RT_RENTER(__s) do { \ 201 if (!cpu_intr_p()) \ 202 __s = pserialize_read_enter(); \ 203 else \ 204 __s = splhigh(); \ 205 } while (0) 206 #define BRIDGE_RT_REXIT(__s) do { \ 207 if (!cpu_intr_p()) \ 208 pserialize_read_exit(__s); \ 209 else \ 210 splx(__s); \ 211 } while (0) 212 #else /* BRIDGE_MPSAFE */ 213 #define BRIDGE_RT_RENTER(__s) do { __s = 0; } while (0) 214 #define BRIDGE_RT_REXIT(__s) do { (void)__s; } while (0) 215 #endif /* BRIDGE_MPSAFE */ 216 217 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 218 219 static struct pool bridge_rtnode_pool; 220 static struct work bridge_rtage_wk; 221 222 static int bridge_clone_create(struct if_clone *, int); 223 static int bridge_clone_destroy(struct ifnet *); 224 225 static int bridge_ioctl(struct ifnet *, u_long, void *); 226 static int bridge_init(struct ifnet *); 227 static void bridge_stop(struct ifnet *, int); 228 static void bridge_start(struct ifnet *); 229 230 static void bridge_input(struct ifnet *, struct mbuf *); 231 static void bridge_forward(void *); 232 233 static void bridge_timer(void *); 234 235 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 236 struct mbuf *); 237 238 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 239 struct ifnet *, int, uint8_t); 240 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 241 static void bridge_rttrim(struct bridge_softc *); 242 static void bridge_rtage(struct bridge_softc *); 243 static void bridge_rtage_work(struct work *, void *); 244 static void bridge_rtflush(struct bridge_softc *, int); 245 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 246 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp); 247 248 static void bridge_rtable_init(struct bridge_softc *); 249 static void bridge_rtable_fini(struct bridge_softc *); 250 251 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 252 const uint8_t *); 253 static int bridge_rtnode_insert(struct bridge_softc *, 254 struct bridge_rtnode *); 255 static void bridge_rtnode_remove(struct bridge_softc *, 256 struct bridge_rtnode *); 257 static void bridge_rtnode_destroy(struct bridge_rtnode *); 258 259 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 260 const char *name); 261 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 262 struct ifnet *ifp); 263 static void bridge_release_member(struct bridge_softc *, struct bridge_iflist *); 264 static void bridge_delete_member(struct bridge_softc *, 265 struct bridge_iflist *); 266 static struct bridge_iflist *bridge_try_hold_bif(struct bridge_iflist *); 267 268 static int bridge_ioctl_add(struct bridge_softc *, void *); 269 static int bridge_ioctl_del(struct bridge_softc *, void *); 270 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 271 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 272 static int bridge_ioctl_scache(struct bridge_softc *, void *); 273 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 274 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 275 static int bridge_ioctl_rts(struct bridge_softc *, void *); 276 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 277 static int bridge_ioctl_sto(struct bridge_softc *, void *); 278 static int bridge_ioctl_gto(struct bridge_softc *, void *); 279 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 280 static int bridge_ioctl_flush(struct bridge_softc *, void *); 281 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 282 static int bridge_ioctl_spri(struct bridge_softc *, void *); 283 static int bridge_ioctl_ght(struct bridge_softc *, void *); 284 static int bridge_ioctl_sht(struct bridge_softc *, void *); 285 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 286 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 287 static int bridge_ioctl_gma(struct bridge_softc *, void *); 288 static int bridge_ioctl_sma(struct bridge_softc *, void *); 289 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 290 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 291 #if defined(BRIDGE_IPF) 292 static int bridge_ioctl_gfilt(struct bridge_softc *, void *); 293 static int bridge_ioctl_sfilt(struct bridge_softc *, void *); 294 static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int); 295 static int bridge_ip_checkbasic(struct mbuf **mp); 296 # ifdef INET6 297 static int bridge_ip6_checkbasic(struct mbuf **mp); 298 # endif /* INET6 */ 299 #endif /* BRIDGE_IPF */ 300 301 static void bridge_sysctl_fwdq_setup(struct sysctllog **clog, 302 struct bridge_softc *sc); 303 304 struct bridge_control { 305 int (*bc_func)(struct bridge_softc *, void *); 306 int bc_argsize; 307 int bc_flags; 308 }; 309 310 #define BC_F_COPYIN 0x01 /* copy arguments in */ 311 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 312 #define BC_F_SUSER 0x04 /* do super-user check */ 313 #define BC_F_XLATEIN 0x08 /* xlate arguments in */ 314 #define BC_F_XLATEOUT 0x10 /* xlate arguments out */ 315 316 static const struct bridge_control bridge_control_table[] = { 317 [BRDGADD] = {bridge_ioctl_add, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 318 [BRDGDEL] = {bridge_ioctl_del, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 319 320 [BRDGGIFFLGS] = {bridge_ioctl_gifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_COPYOUT}, 321 [BRDGSIFFLGS] = {bridge_ioctl_sifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 322 323 [BRDGSCACHE] = {bridge_ioctl_scache, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 324 [BRDGGCACHE] = {bridge_ioctl_gcache, sizeof(struct ifbrparam), BC_F_COPYOUT}, 325 326 [OBRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_COPYIN|BC_F_COPYOUT}, 327 [OBRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_COPYIN|BC_F_COPYOUT}, 328 329 [BRDGSADDR] = {bridge_ioctl_saddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 330 331 [BRDGSTO] = {bridge_ioctl_sto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 332 [BRDGGTO] = {bridge_ioctl_gto, sizeof(struct ifbrparam), BC_F_COPYOUT}, 333 334 [BRDGDADDR] = {bridge_ioctl_daddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 335 336 [BRDGFLUSH] = {bridge_ioctl_flush, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 337 338 [BRDGGPRI] = {bridge_ioctl_gpri, sizeof(struct ifbrparam), BC_F_COPYOUT}, 339 [BRDGSPRI] = {bridge_ioctl_spri, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 340 341 [BRDGGHT] = {bridge_ioctl_ght, sizeof(struct ifbrparam), BC_F_COPYOUT}, 342 [BRDGSHT] = {bridge_ioctl_sht, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 343 344 [BRDGGFD] = {bridge_ioctl_gfd, sizeof(struct ifbrparam), BC_F_COPYOUT}, 345 [BRDGSFD] = {bridge_ioctl_sfd, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 346 347 [BRDGGMA] = {bridge_ioctl_gma, sizeof(struct ifbrparam), BC_F_COPYOUT}, 348 [BRDGSMA] = {bridge_ioctl_sma, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 349 350 [BRDGSIFPRIO] = {bridge_ioctl_sifprio, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 351 352 [BRDGSIFCOST] = {bridge_ioctl_sifcost, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 353 #if defined(BRIDGE_IPF) 354 [BRDGGFILT] = {bridge_ioctl_gfilt, sizeof(struct ifbrparam), BC_F_COPYOUT}, 355 [BRDGSFILT] = {bridge_ioctl_sfilt, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 356 #endif /* BRIDGE_IPF */ 357 [BRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 358 [BRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_XLATEIN|BC_F_XLATEOUT}, 359 }; 360 361 static const int bridge_control_table_size = __arraycount(bridge_control_table); 362 363 static LIST_HEAD(, bridge_softc) bridge_list; 364 static kmutex_t bridge_list_lock; 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 LIST_INIT(&bridge_list); 382 mutex_init(&bridge_list_lock, MUTEX_DEFAULT, IPL_NET); 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, flags; 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 #ifdef BRIDGE_MPSAFE 414 flags = WQ_MPSAFE; 415 #else 416 flags = 0; 417 #endif 418 error = workqueue_create(&sc->sc_rtage_wq, "bridge_rtage", 419 bridge_rtage_work, sc, PRI_SOFTNET, IPL_SOFTNET, flags); 420 if (error) 421 panic("%s: workqueue_create %d\n", __func__, error); 422 423 callout_init(&sc->sc_brcallout, 0); 424 callout_init(&sc->sc_bstpcallout, 0); 425 426 LIST_INIT(&sc->sc_iflist); 427 #ifdef BRIDGE_MPSAFE 428 sc->sc_iflist_intr_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NET); 429 sc->sc_iflist_psz = pserialize_create(); 430 sc->sc_iflist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 431 #else 432 sc->sc_iflist_intr_lock = NULL; 433 sc->sc_iflist_psz = NULL; 434 sc->sc_iflist_lock = NULL; 435 #endif 436 cv_init(&sc->sc_iflist_cv, "if_bridge_cv"); 437 438 if_initname(ifp, ifc->ifc_name, unit); 439 ifp->if_softc = sc; 440 ifp->if_mtu = ETHERMTU; 441 ifp->if_ioctl = bridge_ioctl; 442 ifp->if_output = bridge_output; 443 ifp->if_start = bridge_start; 444 ifp->if_stop = bridge_stop; 445 ifp->if_init = bridge_init; 446 ifp->if_type = IFT_BRIDGE; 447 ifp->if_addrlen = 0; 448 ifp->if_dlt = DLT_EN10MB; 449 ifp->if_hdrlen = ETHER_HDR_LEN; 450 451 sc->sc_fwd_pktq = pktq_create(IFQ_MAXLEN, bridge_forward, sc); 452 KASSERT(sc->sc_fwd_pktq != NULL); 453 454 bridge_sysctl_fwdq_setup(&ifp->if_sysctl_log, sc); 455 456 if_attach(ifp); 457 458 if_alloc_sadl(ifp); 459 460 mutex_enter(&bridge_list_lock); 461 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 462 mutex_exit(&bridge_list_lock); 463 464 return (0); 465 } 466 467 /* 468 * bridge_clone_destroy: 469 * 470 * Destroy a bridge instance. 471 */ 472 static int 473 bridge_clone_destroy(struct ifnet *ifp) 474 { 475 struct bridge_softc *sc = ifp->if_softc; 476 struct bridge_iflist *bif; 477 int s; 478 479 /* Must be called during IFF_RUNNING, i.e., before bridge_stop */ 480 pktq_barrier(sc->sc_fwd_pktq); 481 482 s = splnet(); 483 484 bridge_stop(ifp, 1); 485 486 BRIDGE_LOCK(sc); 487 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 488 bridge_delete_member(sc, bif); 489 BRIDGE_UNLOCK(sc); 490 491 mutex_enter(&bridge_list_lock); 492 LIST_REMOVE(sc, sc_list); 493 mutex_exit(&bridge_list_lock); 494 495 splx(s); 496 497 if_detach(ifp); 498 499 /* Should be called after if_detach for safe */ 500 pktq_flush(sc->sc_fwd_pktq); 501 pktq_destroy(sc->sc_fwd_pktq); 502 503 /* Tear down the routing table. */ 504 bridge_rtable_fini(sc); 505 506 cv_destroy(&sc->sc_iflist_cv); 507 if (sc->sc_iflist_intr_lock) 508 mutex_obj_free(sc->sc_iflist_intr_lock); 509 510 if (sc->sc_iflist_psz) 511 pserialize_destroy(sc->sc_iflist_psz); 512 if (sc->sc_iflist_lock) 513 mutex_obj_free(sc->sc_iflist_lock); 514 515 workqueue_destroy(sc->sc_rtage_wq); 516 517 kmem_free(sc, sizeof(*sc)); 518 519 return (0); 520 } 521 522 static int 523 bridge_sysctl_fwdq_maxlen(SYSCTLFN_ARGS) 524 { 525 struct sysctlnode node = *rnode; 526 const struct bridge_softc *sc = node.sysctl_data; 527 return sysctl_pktq_maxlen(SYSCTLFN_CALL(rnode), sc->sc_fwd_pktq); 528 } 529 530 #define SYSCTL_BRIDGE_PKTQ(cn, c) \ 531 static int \ 532 bridge_sysctl_fwdq_##cn(SYSCTLFN_ARGS) \ 533 { \ 534 struct sysctlnode node = *rnode; \ 535 const struct bridge_softc *sc = node.sysctl_data; \ 536 return sysctl_pktq_count(SYSCTLFN_CALL(rnode), \ 537 sc->sc_fwd_pktq, c); \ 538 } 539 540 SYSCTL_BRIDGE_PKTQ(items, PKTQ_NITEMS) 541 SYSCTL_BRIDGE_PKTQ(drops, PKTQ_DROPS) 542 543 static void 544 bridge_sysctl_fwdq_setup(struct sysctllog **clog, struct bridge_softc *sc) 545 { 546 const struct sysctlnode *cnode, *rnode; 547 sysctlfn len_func = NULL, maxlen_func = NULL, drops_func = NULL; 548 const char *ifname = sc->sc_if.if_xname; 549 550 len_func = bridge_sysctl_fwdq_items; 551 maxlen_func = bridge_sysctl_fwdq_maxlen; 552 drops_func = bridge_sysctl_fwdq_drops; 553 554 if (sysctl_createv(clog, 0, NULL, &rnode, 555 CTLFLAG_PERMANENT, 556 CTLTYPE_NODE, "interfaces", 557 SYSCTL_DESCR("Per-interface controls"), 558 NULL, 0, NULL, 0, 559 CTL_NET, CTL_CREATE, CTL_EOL) != 0) 560 goto bad; 561 562 if (sysctl_createv(clog, 0, &rnode, &rnode, 563 CTLFLAG_PERMANENT, 564 CTLTYPE_NODE, ifname, 565 SYSCTL_DESCR("Interface controls"), 566 NULL, 0, NULL, 0, 567 CTL_CREATE, CTL_EOL) != 0) 568 goto bad; 569 570 if (sysctl_createv(clog, 0, &rnode, &rnode, 571 CTLFLAG_PERMANENT, 572 CTLTYPE_NODE, "fwdq", 573 SYSCTL_DESCR("Protocol input queue controls"), 574 NULL, 0, NULL, 0, 575 CTL_CREATE, CTL_EOL) != 0) 576 goto bad; 577 578 if (sysctl_createv(clog, 0, &rnode, &cnode, 579 CTLFLAG_PERMANENT, 580 CTLTYPE_INT, "len", 581 SYSCTL_DESCR("Current forwarding queue length"), 582 len_func, 0, (void *)sc, 0, 583 CTL_CREATE, IFQCTL_LEN, CTL_EOL) != 0) 584 goto bad; 585 586 if (sysctl_createv(clog, 0, &rnode, &cnode, 587 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 588 CTLTYPE_INT, "maxlen", 589 SYSCTL_DESCR("Maximum allowed forwarding queue length"), 590 maxlen_func, 0, (void *)sc, 0, 591 CTL_CREATE, IFQCTL_MAXLEN, CTL_EOL) != 0) 592 goto bad; 593 594 if (sysctl_createv(clog, 0, &rnode, &cnode, 595 CTLFLAG_PERMANENT, 596 CTLTYPE_INT, "drops", 597 SYSCTL_DESCR("Packets dropped due to full forwarding queue"), 598 drops_func, 0, (void *)sc, 0, 599 CTL_CREATE, IFQCTL_DROPS, CTL_EOL) != 0) 600 goto bad; 601 602 return; 603 bad: 604 aprint_error("%s: could not attach sysctl nodes\n", ifname); 605 return; 606 } 607 608 /* 609 * bridge_ioctl: 610 * 611 * Handle a control request from the operator. 612 */ 613 static int 614 bridge_ioctl(struct ifnet *ifp, u_long cmd, void *data) 615 { 616 struct bridge_softc *sc = ifp->if_softc; 617 struct lwp *l = curlwp; /* XXX */ 618 union { 619 struct ifbreq ifbreq; 620 struct ifbifconf ifbifconf; 621 struct ifbareq ifbareq; 622 struct ifbaconf ifbaconf; 623 struct ifbrparam ifbrparam; 624 } args; 625 struct ifdrv *ifd = (struct ifdrv *) data; 626 const struct bridge_control *bc = NULL; /* XXXGCC */ 627 int s, error = 0; 628 629 /* Authorize command before calling splnet(). */ 630 switch (cmd) { 631 case SIOCGDRVSPEC: 632 case SIOCSDRVSPEC: 633 if (ifd->ifd_cmd >= bridge_control_table_size 634 || (bc = &bridge_control_table[ifd->ifd_cmd]) == NULL) { 635 error = EINVAL; 636 return error; 637 } 638 639 /* We only care about BC_F_SUSER at this point. */ 640 if ((bc->bc_flags & BC_F_SUSER) == 0) 641 break; 642 643 error = kauth_authorize_network(l->l_cred, 644 KAUTH_NETWORK_INTERFACE_BRIDGE, 645 cmd == SIOCGDRVSPEC ? 646 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_GETPRIV : 647 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_SETPRIV, 648 ifd, NULL, NULL); 649 if (error) 650 return (error); 651 652 break; 653 } 654 655 s = splnet(); 656 657 switch (cmd) { 658 case SIOCGDRVSPEC: 659 case SIOCSDRVSPEC: 660 KASSERT(bc != NULL); 661 if (cmd == SIOCGDRVSPEC && 662 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) == 0) { 663 error = EINVAL; 664 break; 665 } 666 else if (cmd == SIOCSDRVSPEC && 667 (bc->bc_flags & (BC_F_COPYOUT|BC_F_XLATEOUT)) != 0) { 668 error = EINVAL; 669 break; 670 } 671 672 /* BC_F_SUSER is checked above, before splnet(). */ 673 674 if ((bc->bc_flags & (BC_F_XLATEIN|BC_F_XLATEOUT)) == 0 675 && (ifd->ifd_len != bc->bc_argsize 676 || ifd->ifd_len > sizeof(args))) { 677 error = EINVAL; 678 break; 679 } 680 681 memset(&args, 0, sizeof(args)); 682 if (bc->bc_flags & BC_F_COPYIN) { 683 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 684 if (error) 685 break; 686 } else if (bc->bc_flags & BC_F_XLATEIN) { 687 args.ifbifconf.ifbic_len = ifd->ifd_len; 688 args.ifbifconf.ifbic_buf = ifd->ifd_data; 689 } 690 691 error = (*bc->bc_func)(sc, &args); 692 if (error) 693 break; 694 695 if (bc->bc_flags & BC_F_COPYOUT) { 696 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 697 } else if (bc->bc_flags & BC_F_XLATEOUT) { 698 ifd->ifd_len = args.ifbifconf.ifbic_len; 699 ifd->ifd_data = args.ifbifconf.ifbic_buf; 700 } 701 break; 702 703 case SIOCSIFFLAGS: 704 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 705 break; 706 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 707 case IFF_RUNNING: 708 /* 709 * If interface is marked down and it is running, 710 * then stop and disable it. 711 */ 712 (*ifp->if_stop)(ifp, 1); 713 break; 714 case IFF_UP: 715 /* 716 * If interface is marked up and it is stopped, then 717 * start it. 718 */ 719 error = (*ifp->if_init)(ifp); 720 break; 721 default: 722 break; 723 } 724 break; 725 726 case SIOCSIFMTU: 727 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 728 error = 0; 729 break; 730 731 default: 732 error = ifioctl_common(ifp, cmd, data); 733 break; 734 } 735 736 splx(s); 737 738 return (error); 739 } 740 741 /* 742 * bridge_lookup_member: 743 * 744 * Lookup a bridge member interface. 745 */ 746 static struct bridge_iflist * 747 bridge_lookup_member(struct bridge_softc *sc, const char *name) 748 { 749 struct bridge_iflist *bif; 750 struct ifnet *ifp; 751 int s; 752 753 BRIDGE_PSZ_RENTER(s); 754 755 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 756 ifp = bif->bif_ifp; 757 if (strcmp(ifp->if_xname, name) == 0) 758 break; 759 } 760 bif = bridge_try_hold_bif(bif); 761 762 BRIDGE_PSZ_REXIT(s); 763 764 return bif; 765 } 766 767 /* 768 * bridge_lookup_member_if: 769 * 770 * Lookup a bridge member interface by ifnet*. 771 */ 772 static struct bridge_iflist * 773 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 774 { 775 struct bridge_iflist *bif; 776 int s; 777 778 BRIDGE_PSZ_RENTER(s); 779 780 bif = member_ifp->if_bridgeif; 781 bif = bridge_try_hold_bif(bif); 782 783 BRIDGE_PSZ_REXIT(s); 784 785 return bif; 786 } 787 788 static struct bridge_iflist * 789 bridge_try_hold_bif(struct bridge_iflist *bif) 790 { 791 #ifdef BRIDGE_MPSAFE 792 if (bif != NULL) { 793 if (bif->bif_waiting) 794 bif = NULL; 795 else 796 atomic_inc_32(&bif->bif_refs); 797 } 798 #endif 799 return bif; 800 } 801 802 /* 803 * bridge_release_member: 804 * 805 * Release the specified member interface. 806 */ 807 static void 808 bridge_release_member(struct bridge_softc *sc, struct bridge_iflist *bif) 809 { 810 #ifdef BRIDGE_MPSAFE 811 uint32_t refs; 812 813 refs = atomic_dec_uint_nv(&bif->bif_refs); 814 if (__predict_false(refs == 0 && bif->bif_waiting)) { 815 BRIDGE_INTR_LOCK(sc); 816 cv_broadcast(&sc->sc_iflist_cv); 817 BRIDGE_INTR_UNLOCK(sc); 818 } 819 #else 820 (void)sc; 821 (void)bif; 822 #endif 823 } 824 825 /* 826 * bridge_delete_member: 827 * 828 * Delete the specified member interface. 829 */ 830 static void 831 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 832 { 833 struct ifnet *ifs = bif->bif_ifp; 834 835 KASSERT(BRIDGE_LOCKED(sc)); 836 837 ifs->if_input = ether_input; 838 ifs->if_bridge = NULL; 839 ifs->if_bridgeif = NULL; 840 841 LIST_REMOVE(bif, bif_next); 842 843 BRIDGE_PSZ_PERFORM(sc); 844 845 BRIDGE_UNLOCK(sc); 846 847 #ifdef BRIDGE_MPSAFE 848 BRIDGE_INTR_LOCK(sc); 849 bif->bif_waiting = true; 850 membar_sync(); 851 while (bif->bif_refs > 0) { 852 aprint_debug("%s: cv_wait on iflist\n", __func__); 853 cv_wait(&sc->sc_iflist_cv, sc->sc_iflist_intr_lock); 854 } 855 bif->bif_waiting = false; 856 BRIDGE_INTR_UNLOCK(sc); 857 #endif 858 859 kmem_free(bif, sizeof(*bif)); 860 861 BRIDGE_LOCK(sc); 862 } 863 864 static int 865 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 866 { 867 struct ifbreq *req = arg; 868 struct bridge_iflist *bif = NULL; 869 struct ifnet *ifs; 870 int error = 0; 871 872 ifs = ifunit(req->ifbr_ifsname); 873 if (ifs == NULL) 874 return (ENOENT); 875 876 if (sc->sc_if.if_mtu != ifs->if_mtu) 877 return (EINVAL); 878 879 if (ifs->if_bridge == sc) 880 return (EEXIST); 881 882 if (ifs->if_bridge != NULL) 883 return (EBUSY); 884 885 if (ifs->if_input != ether_input) 886 return EINVAL; 887 888 /* FIXME: doesn't work with non-IFF_SIMPLEX interfaces */ 889 if ((ifs->if_flags & IFF_SIMPLEX) == 0) 890 return EINVAL; 891 892 bif = kmem_alloc(sizeof(*bif), KM_SLEEP); 893 894 switch (ifs->if_type) { 895 case IFT_ETHER: 896 /* 897 * Place the interface into promiscuous mode. 898 */ 899 error = ifpromisc(ifs, 1); 900 if (error) 901 goto out; 902 break; 903 default: 904 error = EINVAL; 905 goto out; 906 } 907 908 bif->bif_ifp = ifs; 909 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 910 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 911 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 912 bif->bif_refs = 0; 913 bif->bif_waiting = false; 914 915 BRIDGE_LOCK(sc); 916 917 ifs->if_bridge = sc; 918 ifs->if_bridgeif = bif; 919 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 920 ifs->if_input = bridge_input; 921 922 BRIDGE_UNLOCK(sc); 923 924 if (sc->sc_if.if_flags & IFF_RUNNING) 925 bstp_initialization(sc); 926 else 927 bstp_stop(sc); 928 929 out: 930 if (error) { 931 if (bif != NULL) 932 kmem_free(bif, sizeof(*bif)); 933 } 934 return (error); 935 } 936 937 static int 938 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 939 { 940 struct ifbreq *req = arg; 941 const char *name = req->ifbr_ifsname; 942 struct bridge_iflist *bif; 943 struct ifnet *ifs; 944 945 BRIDGE_LOCK(sc); 946 947 /* 948 * Don't use bridge_lookup_member. We want to get a member 949 * with bif_refs == 0. 950 */ 951 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 952 ifs = bif->bif_ifp; 953 if (strcmp(ifs->if_xname, name) == 0) 954 break; 955 } 956 957 if (bif == NULL) { 958 BRIDGE_UNLOCK(sc); 959 return ENOENT; 960 } 961 962 bridge_delete_member(sc, bif); 963 964 BRIDGE_UNLOCK(sc); 965 966 switch (ifs->if_type) { 967 case IFT_ETHER: 968 /* 969 * Take the interface out of promiscuous mode. 970 * Don't call it with holding a spin lock. 971 */ 972 (void) ifpromisc(ifs, 0); 973 break; 974 default: 975 #ifdef DIAGNOSTIC 976 panic("bridge_delete_member: impossible"); 977 #endif 978 break; 979 } 980 981 bridge_rtdelete(sc, ifs); 982 983 if (sc->sc_if.if_flags & IFF_RUNNING) 984 bstp_initialization(sc); 985 986 return 0; 987 } 988 989 static int 990 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 991 { 992 struct ifbreq *req = arg; 993 struct bridge_iflist *bif; 994 995 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 996 if (bif == NULL) 997 return (ENOENT); 998 999 req->ifbr_ifsflags = bif->bif_flags; 1000 req->ifbr_state = bif->bif_state; 1001 req->ifbr_priority = bif->bif_priority; 1002 req->ifbr_path_cost = bif->bif_path_cost; 1003 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 1004 1005 bridge_release_member(sc, bif); 1006 1007 return (0); 1008 } 1009 1010 static int 1011 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1012 { 1013 struct ifbreq *req = arg; 1014 struct bridge_iflist *bif; 1015 1016 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1017 if (bif == NULL) 1018 return (ENOENT); 1019 1020 if (req->ifbr_ifsflags & IFBIF_STP) { 1021 switch (bif->bif_ifp->if_type) { 1022 case IFT_ETHER: 1023 /* These can do spanning tree. */ 1024 break; 1025 1026 default: 1027 /* Nothing else can. */ 1028 bridge_release_member(sc, bif); 1029 return (EINVAL); 1030 } 1031 } 1032 1033 bif->bif_flags = req->ifbr_ifsflags; 1034 1035 bridge_release_member(sc, bif); 1036 1037 if (sc->sc_if.if_flags & IFF_RUNNING) 1038 bstp_initialization(sc); 1039 1040 return (0); 1041 } 1042 1043 static int 1044 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1045 { 1046 struct ifbrparam *param = arg; 1047 1048 sc->sc_brtmax = param->ifbrp_csize; 1049 bridge_rttrim(sc); 1050 1051 return (0); 1052 } 1053 1054 static int 1055 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1056 { 1057 struct ifbrparam *param = arg; 1058 1059 param->ifbrp_csize = sc->sc_brtmax; 1060 1061 return (0); 1062 } 1063 1064 static int 1065 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1066 { 1067 struct ifbifconf *bifc = arg; 1068 struct bridge_iflist *bif; 1069 struct ifbreq *breqs; 1070 int i, count, error = 0; 1071 1072 retry: 1073 BRIDGE_LOCK(sc); 1074 count = 0; 1075 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1076 count++; 1077 BRIDGE_UNLOCK(sc); 1078 1079 if (count == 0) { 1080 bifc->ifbic_len = 0; 1081 return 0; 1082 } 1083 1084 if (bifc->ifbic_len == 0 || bifc->ifbic_len < (sizeof(*breqs) * count)) { 1085 /* Tell that a larger buffer is needed */ 1086 bifc->ifbic_len = sizeof(*breqs) * count; 1087 return 0; 1088 } 1089 1090 breqs = kmem_alloc(sizeof(*breqs) * count, KM_SLEEP); 1091 1092 BRIDGE_LOCK(sc); 1093 1094 i = 0; 1095 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1096 i++; 1097 if (i > count) { 1098 /* 1099 * The number of members has been increased. 1100 * We need more memory! 1101 */ 1102 BRIDGE_UNLOCK(sc); 1103 kmem_free(breqs, sizeof(*breqs) * count); 1104 goto retry; 1105 } 1106 1107 i = 0; 1108 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1109 struct ifbreq *breq = &breqs[i++]; 1110 memset(breq, 0, sizeof(*breq)); 1111 1112 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, 1113 sizeof(breq->ifbr_ifsname)); 1114 breq->ifbr_ifsflags = bif->bif_flags; 1115 breq->ifbr_state = bif->bif_state; 1116 breq->ifbr_priority = bif->bif_priority; 1117 breq->ifbr_path_cost = bif->bif_path_cost; 1118 breq->ifbr_portno = bif->bif_ifp->if_index & 0xff; 1119 } 1120 1121 /* Don't call copyout with holding the mutex */ 1122 BRIDGE_UNLOCK(sc); 1123 1124 for (i = 0; i < count; i++) { 1125 error = copyout(&breqs[i], bifc->ifbic_req + i, sizeof(*breqs)); 1126 if (error) 1127 break; 1128 } 1129 bifc->ifbic_len = sizeof(*breqs) * i; 1130 1131 kmem_free(breqs, sizeof(*breqs) * count); 1132 1133 return error; 1134 } 1135 1136 static int 1137 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1138 { 1139 struct ifbaconf *bac = arg; 1140 struct bridge_rtnode *brt; 1141 struct ifbareq bareq; 1142 int count = 0, error = 0, len; 1143 1144 if (bac->ifbac_len == 0) 1145 return (0); 1146 1147 BRIDGE_RT_INTR_LOCK(sc); 1148 1149 len = bac->ifbac_len; 1150 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1151 if (len < sizeof(bareq)) 1152 goto out; 1153 memset(&bareq, 0, sizeof(bareq)); 1154 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1155 sizeof(bareq.ifba_ifsname)); 1156 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1157 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1158 bareq.ifba_expire = brt->brt_expire - time_uptime; 1159 } else 1160 bareq.ifba_expire = 0; 1161 bareq.ifba_flags = brt->brt_flags; 1162 1163 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1164 if (error) 1165 goto out; 1166 count++; 1167 len -= sizeof(bareq); 1168 } 1169 out: 1170 BRIDGE_RT_INTR_UNLOCK(sc); 1171 1172 bac->ifbac_len = sizeof(bareq) * count; 1173 return (error); 1174 } 1175 1176 static int 1177 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1178 { 1179 struct ifbareq *req = arg; 1180 struct bridge_iflist *bif; 1181 int error; 1182 1183 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1184 if (bif == NULL) 1185 return (ENOENT); 1186 1187 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1188 req->ifba_flags); 1189 1190 bridge_release_member(sc, bif); 1191 1192 return (error); 1193 } 1194 1195 static int 1196 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1197 { 1198 struct ifbrparam *param = arg; 1199 1200 sc->sc_brttimeout = param->ifbrp_ctime; 1201 1202 return (0); 1203 } 1204 1205 static int 1206 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1207 { 1208 struct ifbrparam *param = arg; 1209 1210 param->ifbrp_ctime = sc->sc_brttimeout; 1211 1212 return (0); 1213 } 1214 1215 static int 1216 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1217 { 1218 struct ifbareq *req = arg; 1219 1220 return (bridge_rtdaddr(sc, req->ifba_dst)); 1221 } 1222 1223 static int 1224 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1225 { 1226 struct ifbreq *req = arg; 1227 1228 bridge_rtflush(sc, req->ifbr_ifsflags); 1229 1230 return (0); 1231 } 1232 1233 static int 1234 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1235 { 1236 struct ifbrparam *param = arg; 1237 1238 param->ifbrp_prio = sc->sc_bridge_priority; 1239 1240 return (0); 1241 } 1242 1243 static int 1244 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1245 { 1246 struct ifbrparam *param = arg; 1247 1248 sc->sc_bridge_priority = param->ifbrp_prio; 1249 1250 if (sc->sc_if.if_flags & IFF_RUNNING) 1251 bstp_initialization(sc); 1252 1253 return (0); 1254 } 1255 1256 static int 1257 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1258 { 1259 struct ifbrparam *param = arg; 1260 1261 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1262 1263 return (0); 1264 } 1265 1266 static int 1267 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1268 { 1269 struct ifbrparam *param = arg; 1270 1271 if (param->ifbrp_hellotime == 0) 1272 return (EINVAL); 1273 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1274 1275 if (sc->sc_if.if_flags & IFF_RUNNING) 1276 bstp_initialization(sc); 1277 1278 return (0); 1279 } 1280 1281 static int 1282 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1283 { 1284 struct ifbrparam *param = arg; 1285 1286 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1287 1288 return (0); 1289 } 1290 1291 static int 1292 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1293 { 1294 struct ifbrparam *param = arg; 1295 1296 if (param->ifbrp_fwddelay == 0) 1297 return (EINVAL); 1298 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1299 1300 if (sc->sc_if.if_flags & IFF_RUNNING) 1301 bstp_initialization(sc); 1302 1303 return (0); 1304 } 1305 1306 static int 1307 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1308 { 1309 struct ifbrparam *param = arg; 1310 1311 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1312 1313 return (0); 1314 } 1315 1316 static int 1317 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1318 { 1319 struct ifbrparam *param = arg; 1320 1321 if (param->ifbrp_maxage == 0) 1322 return (EINVAL); 1323 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1324 1325 if (sc->sc_if.if_flags & IFF_RUNNING) 1326 bstp_initialization(sc); 1327 1328 return (0); 1329 } 1330 1331 static int 1332 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1333 { 1334 struct ifbreq *req = arg; 1335 struct bridge_iflist *bif; 1336 1337 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1338 if (bif == NULL) 1339 return (ENOENT); 1340 1341 bif->bif_priority = req->ifbr_priority; 1342 1343 if (sc->sc_if.if_flags & IFF_RUNNING) 1344 bstp_initialization(sc); 1345 1346 bridge_release_member(sc, bif); 1347 1348 return (0); 1349 } 1350 1351 #if defined(BRIDGE_IPF) 1352 static int 1353 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1354 { 1355 struct ifbrparam *param = arg; 1356 1357 param->ifbrp_filter = sc->sc_filter_flags; 1358 1359 return (0); 1360 } 1361 1362 static int 1363 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1364 { 1365 struct ifbrparam *param = arg; 1366 uint32_t nflags, oflags; 1367 1368 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1369 return (EINVAL); 1370 1371 nflags = param->ifbrp_filter; 1372 oflags = sc->sc_filter_flags; 1373 1374 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1375 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1376 sc->sc_if.if_pfil); 1377 } 1378 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1379 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1380 sc->sc_if.if_pfil); 1381 } 1382 1383 sc->sc_filter_flags = nflags; 1384 1385 return (0); 1386 } 1387 #endif /* BRIDGE_IPF */ 1388 1389 static int 1390 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1391 { 1392 struct ifbreq *req = arg; 1393 struct bridge_iflist *bif; 1394 1395 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1396 if (bif == NULL) 1397 return (ENOENT); 1398 1399 bif->bif_path_cost = req->ifbr_path_cost; 1400 1401 if (sc->sc_if.if_flags & IFF_RUNNING) 1402 bstp_initialization(sc); 1403 1404 bridge_release_member(sc, bif); 1405 1406 return (0); 1407 } 1408 1409 /* 1410 * bridge_ifdetach: 1411 * 1412 * Detach an interface from a bridge. Called when a member 1413 * interface is detaching. 1414 */ 1415 void 1416 bridge_ifdetach(struct ifnet *ifp) 1417 { 1418 struct bridge_softc *sc = ifp->if_bridge; 1419 struct ifbreq breq; 1420 1421 /* ioctl_lock should prevent this from happening */ 1422 KASSERT(sc != NULL); 1423 1424 memset(&breq, 0, sizeof(breq)); 1425 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1426 1427 (void) bridge_ioctl_del(sc, &breq); 1428 } 1429 1430 /* 1431 * bridge_init: 1432 * 1433 * Initialize a bridge interface. 1434 */ 1435 static int 1436 bridge_init(struct ifnet *ifp) 1437 { 1438 struct bridge_softc *sc = ifp->if_softc; 1439 1440 if (ifp->if_flags & IFF_RUNNING) 1441 return (0); 1442 1443 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1444 bridge_timer, sc); 1445 1446 ifp->if_flags |= IFF_RUNNING; 1447 bstp_initialization(sc); 1448 return (0); 1449 } 1450 1451 /* 1452 * bridge_stop: 1453 * 1454 * Stop the bridge interface. 1455 */ 1456 static void 1457 bridge_stop(struct ifnet *ifp, int disable) 1458 { 1459 struct bridge_softc *sc = ifp->if_softc; 1460 1461 if ((ifp->if_flags & IFF_RUNNING) == 0) 1462 return; 1463 1464 callout_stop(&sc->sc_brcallout); 1465 bstp_stop(sc); 1466 1467 bridge_rtflush(sc, IFBF_FLUSHDYN); 1468 1469 ifp->if_flags &= ~IFF_RUNNING; 1470 } 1471 1472 /* 1473 * bridge_enqueue: 1474 * 1475 * Enqueue a packet on a bridge member interface. 1476 */ 1477 void 1478 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1479 int runfilt) 1480 { 1481 ALTQ_DECL(struct altq_pktattr pktattr;) 1482 int len, error; 1483 short mflags; 1484 1485 /* 1486 * Clear any in-bound checksum flags for this packet. 1487 */ 1488 m->m_pkthdr.csum_flags = 0; 1489 1490 if (runfilt) { 1491 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1492 dst_ifp, PFIL_OUT) != 0) { 1493 if (m != NULL) 1494 m_freem(m); 1495 return; 1496 } 1497 if (m == NULL) 1498 return; 1499 } 1500 1501 #ifdef ALTQ 1502 /* 1503 * If ALTQ is enabled on the member interface, do 1504 * classification; the queueing discipline might 1505 * not require classification, but might require 1506 * the address family/header pointer in the pktattr. 1507 */ 1508 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1509 /* XXX IFT_ETHER */ 1510 altq_etherclassify(&dst_ifp->if_snd, m, &pktattr); 1511 } 1512 #endif /* ALTQ */ 1513 1514 len = m->m_pkthdr.len; 1515 mflags = m->m_flags; 1516 1517 IFQ_ENQUEUE(&dst_ifp->if_snd, m, &pktattr, error); 1518 1519 if (error) { 1520 /* mbuf is already freed */ 1521 sc->sc_if.if_oerrors++; 1522 return; 1523 } 1524 1525 sc->sc_if.if_opackets++; 1526 sc->sc_if.if_obytes += len; 1527 1528 dst_ifp->if_obytes += len; 1529 1530 if (mflags & M_MCAST) { 1531 sc->sc_if.if_omcasts++; 1532 dst_ifp->if_omcasts++; 1533 } 1534 1535 if ((dst_ifp->if_flags & IFF_OACTIVE) == 0) 1536 (*dst_ifp->if_start)(dst_ifp); 1537 } 1538 1539 /* 1540 * bridge_output: 1541 * 1542 * Send output from a bridge member interface. This 1543 * performs the bridging function for locally originated 1544 * packets. 1545 * 1546 * The mbuf has the Ethernet header already attached. We must 1547 * enqueue or free the mbuf before returning. 1548 */ 1549 int 1550 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1551 struct rtentry *rt) 1552 { 1553 struct ether_header *eh; 1554 struct ifnet *dst_if; 1555 struct bridge_softc *sc; 1556 #ifndef BRIDGE_MPSAFE 1557 int s; 1558 #endif 1559 1560 if (m->m_len < ETHER_HDR_LEN) { 1561 m = m_pullup(m, ETHER_HDR_LEN); 1562 if (m == NULL) 1563 return (0); 1564 } 1565 1566 eh = mtod(m, struct ether_header *); 1567 sc = ifp->if_bridge; 1568 1569 #ifndef BRIDGE_MPSAFE 1570 s = splnet(); 1571 #endif 1572 1573 /* 1574 * If bridge is down, but the original output interface is up, 1575 * go ahead and send out that interface. Otherwise, the packet 1576 * is dropped below. 1577 */ 1578 if (__predict_false(sc == NULL) || 1579 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1580 dst_if = ifp; 1581 goto sendunicast; 1582 } 1583 1584 /* 1585 * If the packet is a multicast, or we don't know a better way to 1586 * get there, send to all interfaces. 1587 */ 1588 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1589 dst_if = NULL; 1590 else 1591 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1592 if (dst_if == NULL) { 1593 struct bridge_iflist *bif; 1594 struct mbuf *mc; 1595 int used = 0; 1596 int ss; 1597 1598 BRIDGE_PSZ_RENTER(ss); 1599 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1600 bif = bridge_try_hold_bif(bif); 1601 if (bif == NULL) 1602 continue; 1603 BRIDGE_PSZ_REXIT(ss); 1604 1605 dst_if = bif->bif_ifp; 1606 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1607 goto next; 1608 1609 /* 1610 * If this is not the original output interface, 1611 * and the interface is participating in spanning 1612 * tree, make sure the port is in a state that 1613 * allows forwarding. 1614 */ 1615 if (dst_if != ifp && 1616 (bif->bif_flags & IFBIF_STP) != 0) { 1617 switch (bif->bif_state) { 1618 case BSTP_IFSTATE_BLOCKING: 1619 case BSTP_IFSTATE_LISTENING: 1620 case BSTP_IFSTATE_DISABLED: 1621 goto next; 1622 } 1623 } 1624 1625 if (LIST_NEXT(bif, bif_next) == NULL) { 1626 used = 1; 1627 mc = m; 1628 } else { 1629 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1630 if (mc == NULL) { 1631 sc->sc_if.if_oerrors++; 1632 goto next; 1633 } 1634 } 1635 1636 bridge_enqueue(sc, dst_if, mc, 0); 1637 next: 1638 bridge_release_member(sc, bif); 1639 BRIDGE_PSZ_RENTER(ss); 1640 } 1641 BRIDGE_PSZ_REXIT(ss); 1642 1643 if (used == 0) 1644 m_freem(m); 1645 #ifndef BRIDGE_MPSAFE 1646 splx(s); 1647 #endif 1648 return (0); 1649 } 1650 1651 sendunicast: 1652 /* 1653 * XXX Spanning tree consideration here? 1654 */ 1655 1656 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1657 m_freem(m); 1658 #ifndef BRIDGE_MPSAFE 1659 splx(s); 1660 #endif 1661 return (0); 1662 } 1663 1664 bridge_enqueue(sc, dst_if, m, 0); 1665 1666 #ifndef BRIDGE_MPSAFE 1667 splx(s); 1668 #endif 1669 return (0); 1670 } 1671 1672 /* 1673 * bridge_start: 1674 * 1675 * Start output on a bridge. 1676 * 1677 * NOTE: This routine should never be called in this implementation. 1678 */ 1679 static void 1680 bridge_start(struct ifnet *ifp) 1681 { 1682 1683 printf("%s: bridge_start() called\n", ifp->if_xname); 1684 } 1685 1686 /* 1687 * bridge_forward: 1688 * 1689 * The forwarding function of the bridge. 1690 */ 1691 static void 1692 bridge_forward(void *v) 1693 { 1694 struct bridge_softc *sc = v; 1695 struct mbuf *m; 1696 struct bridge_iflist *bif; 1697 struct ifnet *src_if, *dst_if; 1698 struct ether_header *eh; 1699 #ifndef BRIDGE_MPSAFE 1700 int s; 1701 1702 KERNEL_LOCK(1, NULL); 1703 mutex_enter(softnet_lock); 1704 #endif 1705 1706 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1707 #ifndef BRIDGE_MPSAFE 1708 mutex_exit(softnet_lock); 1709 KERNEL_UNLOCK_ONE(NULL); 1710 #endif 1711 return; 1712 } 1713 1714 #ifndef BRIDGE_MPSAFE 1715 s = splnet(); 1716 #endif 1717 while ((m = pktq_dequeue(sc->sc_fwd_pktq)) != NULL) { 1718 src_if = m->m_pkthdr.rcvif; 1719 1720 sc->sc_if.if_ipackets++; 1721 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1722 1723 /* 1724 * Look up the bridge_iflist. 1725 */ 1726 bif = bridge_lookup_member_if(sc, src_if); 1727 if (bif == NULL) { 1728 /* Interface is not a bridge member (anymore?) */ 1729 m_freem(m); 1730 continue; 1731 } 1732 1733 if (bif->bif_flags & IFBIF_STP) { 1734 switch (bif->bif_state) { 1735 case BSTP_IFSTATE_BLOCKING: 1736 case BSTP_IFSTATE_LISTENING: 1737 case BSTP_IFSTATE_DISABLED: 1738 m_freem(m); 1739 bridge_release_member(sc, bif); 1740 continue; 1741 } 1742 } 1743 1744 eh = mtod(m, struct ether_header *); 1745 1746 /* 1747 * If the interface is learning, and the source 1748 * address is valid and not multicast, record 1749 * the address. 1750 */ 1751 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1752 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1753 (eh->ether_shost[0] == 0 && 1754 eh->ether_shost[1] == 0 && 1755 eh->ether_shost[2] == 0 && 1756 eh->ether_shost[3] == 0 && 1757 eh->ether_shost[4] == 0 && 1758 eh->ether_shost[5] == 0) == 0) { 1759 (void) bridge_rtupdate(sc, eh->ether_shost, 1760 src_if, 0, IFBAF_DYNAMIC); 1761 } 1762 1763 if ((bif->bif_flags & IFBIF_STP) != 0 && 1764 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1765 m_freem(m); 1766 bridge_release_member(sc, bif); 1767 continue; 1768 } 1769 1770 bridge_release_member(sc, bif); 1771 1772 /* 1773 * At this point, the port either doesn't participate 1774 * in spanning tree or it is in the forwarding state. 1775 */ 1776 1777 /* 1778 * If the packet is unicast, destined for someone on 1779 * "this" side of the bridge, drop it. 1780 */ 1781 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1782 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1783 if (src_if == dst_if) { 1784 m_freem(m); 1785 continue; 1786 } 1787 } else { 1788 /* ...forward it to all interfaces. */ 1789 sc->sc_if.if_imcasts++; 1790 dst_if = NULL; 1791 } 1792 1793 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1794 m->m_pkthdr.rcvif, PFIL_IN) != 0) { 1795 if (m != NULL) 1796 m_freem(m); 1797 continue; 1798 } 1799 if (m == NULL) 1800 continue; 1801 1802 if (dst_if == NULL) { 1803 bridge_broadcast(sc, src_if, m); 1804 continue; 1805 } 1806 1807 /* 1808 * At this point, we're dealing with a unicast frame 1809 * going to a different interface. 1810 */ 1811 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1812 m_freem(m); 1813 continue; 1814 } 1815 1816 bif = bridge_lookup_member_if(sc, dst_if); 1817 if (bif == NULL) { 1818 /* Not a member of the bridge (anymore?) */ 1819 m_freem(m); 1820 continue; 1821 } 1822 1823 if (bif->bif_flags & IFBIF_STP) { 1824 switch (bif->bif_state) { 1825 case BSTP_IFSTATE_DISABLED: 1826 case BSTP_IFSTATE_BLOCKING: 1827 m_freem(m); 1828 bridge_release_member(sc, bif); 1829 continue; 1830 } 1831 } 1832 1833 bridge_release_member(sc, bif); 1834 1835 bridge_enqueue(sc, dst_if, m, 1); 1836 } 1837 #ifndef BRIDGE_MPSAFE 1838 splx(s); 1839 mutex_exit(softnet_lock); 1840 KERNEL_UNLOCK_ONE(NULL); 1841 #endif 1842 } 1843 1844 static bool 1845 bstp_state_before_learning(struct bridge_iflist *bif) 1846 { 1847 if (bif->bif_flags & IFBIF_STP) { 1848 switch (bif->bif_state) { 1849 case BSTP_IFSTATE_BLOCKING: 1850 case BSTP_IFSTATE_LISTENING: 1851 case BSTP_IFSTATE_DISABLED: 1852 return true; 1853 } 1854 } 1855 return false; 1856 } 1857 1858 static bool 1859 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1860 { 1861 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1862 1863 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1864 #if NCARP > 0 1865 || (bif->bif_ifp->if_carp && 1866 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1867 #endif /* NCARP > 0 */ 1868 ) 1869 return true; 1870 1871 return false; 1872 } 1873 1874 /* 1875 * bridge_input: 1876 * 1877 * Receive input from a member interface. Queue the packet for 1878 * bridging if it is not for us. 1879 */ 1880 static void 1881 bridge_input(struct ifnet *ifp, struct mbuf *m) 1882 { 1883 struct bridge_softc *sc = ifp->if_bridge; 1884 struct bridge_iflist *bif; 1885 struct ether_header *eh; 1886 1887 if (__predict_false(sc == NULL) || 1888 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1889 ether_input(ifp, m); 1890 return; 1891 } 1892 1893 bif = bridge_lookup_member_if(sc, ifp); 1894 if (bif == NULL) { 1895 ether_input(ifp, m); 1896 return; 1897 } 1898 1899 eh = mtod(m, struct ether_header *); 1900 1901 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1902 if (memcmp(etherbroadcastaddr, 1903 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1904 m->m_flags |= M_BCAST; 1905 else 1906 m->m_flags |= M_MCAST; 1907 } 1908 1909 /* 1910 * A 'fast' path for packets addressed to interfaces that are 1911 * part of this bridge. 1912 */ 1913 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 1914 !bstp_state_before_learning(bif)) { 1915 struct bridge_iflist *_bif; 1916 struct ifnet *_ifp = NULL; 1917 int s; 1918 1919 BRIDGE_PSZ_RENTER(s); 1920 LIST_FOREACH(_bif, &sc->sc_iflist, bif_next) { 1921 /* It is destined for us. */ 1922 if (bridge_ourether(_bif, eh, 0)) { 1923 _bif = bridge_try_hold_bif(_bif); 1924 BRIDGE_PSZ_REXIT(s); 1925 if (_bif == NULL) 1926 goto out; 1927 if (_bif->bif_flags & IFBIF_LEARNING) 1928 (void) bridge_rtupdate(sc, 1929 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1930 _ifp = m->m_pkthdr.rcvif = _bif->bif_ifp; 1931 bridge_release_member(sc, _bif); 1932 goto out; 1933 } 1934 1935 /* We just received a packet that we sent out. */ 1936 if (bridge_ourether(_bif, eh, 1)) 1937 break; 1938 } 1939 BRIDGE_PSZ_REXIT(s); 1940 out: 1941 1942 if (_bif != NULL) { 1943 bridge_release_member(sc, bif); 1944 if (_ifp != NULL) { 1945 m->m_flags &= ~M_PROMISC; 1946 ether_input(_ifp, m); 1947 } else 1948 m_freem(m); 1949 return; 1950 } 1951 } 1952 1953 /* Tap off 802.1D packets; they do not get forwarded. */ 1954 if (bif->bif_flags & IFBIF_STP && 1955 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 1956 bstp_input(sc, bif, m); 1957 bridge_release_member(sc, bif); 1958 return; 1959 } 1960 1961 /* 1962 * A normal switch would discard the packet here, but that's not what 1963 * we've done historically. This also prevents some obnoxious behaviour. 1964 */ 1965 if (bstp_state_before_learning(bif)) { 1966 bridge_release_member(sc, bif); 1967 ether_input(ifp, m); 1968 return; 1969 } 1970 1971 bridge_release_member(sc, bif); 1972 1973 /* Queue the packet for bridge forwarding. */ 1974 if (__predict_false(!pktq_enqueue(sc->sc_fwd_pktq, m, 0))) 1975 m_freem(m); 1976 } 1977 1978 /* 1979 * bridge_broadcast: 1980 * 1981 * Send a frame to all interfaces that are members of 1982 * the bridge, except for the one on which the packet 1983 * arrived. 1984 */ 1985 static void 1986 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1987 struct mbuf *m) 1988 { 1989 struct bridge_iflist *bif; 1990 struct mbuf *mc; 1991 struct ifnet *dst_if; 1992 bool bmcast; 1993 int s; 1994 1995 bmcast = m->m_flags & (M_BCAST|M_MCAST); 1996 1997 BRIDGE_PSZ_RENTER(s); 1998 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1999 bif = bridge_try_hold_bif(bif); 2000 if (bif == NULL) 2001 continue; 2002 BRIDGE_PSZ_REXIT(s); 2003 2004 dst_if = bif->bif_ifp; 2005 2006 if (bif->bif_flags & IFBIF_STP) { 2007 switch (bif->bif_state) { 2008 case BSTP_IFSTATE_BLOCKING: 2009 case BSTP_IFSTATE_DISABLED: 2010 goto next; 2011 } 2012 } 2013 2014 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 2015 goto next; 2016 2017 if ((dst_if->if_flags & IFF_RUNNING) == 0) 2018 goto next; 2019 2020 if (dst_if != src_if) { 2021 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 2022 if (mc == NULL) { 2023 sc->sc_if.if_oerrors++; 2024 goto next; 2025 } 2026 bridge_enqueue(sc, dst_if, mc, 1); 2027 } 2028 2029 if (bmcast) { 2030 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 2031 if (mc == NULL) { 2032 sc->sc_if.if_oerrors++; 2033 goto next; 2034 } 2035 2036 mc->m_pkthdr.rcvif = dst_if; 2037 mc->m_flags &= ~M_PROMISC; 2038 ether_input(dst_if, mc); 2039 } 2040 next: 2041 bridge_release_member(sc, bif); 2042 BRIDGE_PSZ_RENTER(s); 2043 } 2044 BRIDGE_PSZ_REXIT(s); 2045 2046 m_freem(m); 2047 } 2048 2049 static int 2050 bridge_rtalloc(struct bridge_softc *sc, const uint8_t *dst, 2051 struct bridge_rtnode **brtp) 2052 { 2053 struct bridge_rtnode *brt; 2054 int error; 2055 2056 if (sc->sc_brtcnt >= sc->sc_brtmax) 2057 return ENOSPC; 2058 2059 /* 2060 * Allocate a new bridge forwarding node, and 2061 * initialize the expiration time and Ethernet 2062 * address. 2063 */ 2064 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 2065 if (brt == NULL) 2066 return ENOMEM; 2067 2068 memset(brt, 0, sizeof(*brt)); 2069 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2070 brt->brt_flags = IFBAF_DYNAMIC; 2071 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2072 2073 BRIDGE_RT_INTR_LOCK(sc); 2074 error = bridge_rtnode_insert(sc, brt); 2075 BRIDGE_RT_INTR_UNLOCK(sc); 2076 2077 if (error != 0) { 2078 pool_put(&bridge_rtnode_pool, brt); 2079 return error; 2080 } 2081 2082 *brtp = brt; 2083 return 0; 2084 } 2085 2086 /* 2087 * bridge_rtupdate: 2088 * 2089 * Add a bridge routing entry. 2090 */ 2091 static int 2092 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 2093 struct ifnet *dst_if, int setflags, uint8_t flags) 2094 { 2095 struct bridge_rtnode *brt; 2096 int s; 2097 2098 again: 2099 /* 2100 * A route for this destination might already exist. If so, 2101 * update it, otherwise create a new one. 2102 */ 2103 BRIDGE_RT_RENTER(s); 2104 brt = bridge_rtnode_lookup(sc, dst); 2105 2106 if (brt != NULL) { 2107 brt->brt_ifp = dst_if; 2108 if (setflags) { 2109 brt->brt_flags = flags; 2110 if (flags & IFBAF_STATIC) 2111 brt->brt_expire = 0; 2112 else 2113 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2114 } else { 2115 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2116 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2117 } 2118 } 2119 BRIDGE_RT_REXIT(s); 2120 2121 if (brt == NULL) { 2122 int r; 2123 2124 r = bridge_rtalloc(sc, dst, &brt); 2125 if (r != 0) 2126 return r; 2127 goto again; 2128 } 2129 2130 return 0; 2131 } 2132 2133 /* 2134 * bridge_rtlookup: 2135 * 2136 * Lookup the destination interface for an address. 2137 */ 2138 static struct ifnet * 2139 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2140 { 2141 struct bridge_rtnode *brt; 2142 struct ifnet *ifs = NULL; 2143 int s; 2144 2145 BRIDGE_RT_RENTER(s); 2146 brt = bridge_rtnode_lookup(sc, addr); 2147 if (brt != NULL) 2148 ifs = brt->brt_ifp; 2149 BRIDGE_RT_REXIT(s); 2150 2151 return ifs; 2152 } 2153 2154 typedef bool (*bridge_iterate_cb_t) 2155 (struct bridge_softc *, struct bridge_rtnode *, bool *, void *); 2156 2157 /* 2158 * bridge_rtlist_iterate_remove: 2159 * 2160 * It iterates on sc->sc_rtlist and removes rtnodes of it which func 2161 * callback judges to remove. Removals of rtnodes are done in a manner 2162 * of pserialize. To this end, all kmem_* operations are placed out of 2163 * mutexes. 2164 */ 2165 static void 2166 bridge_rtlist_iterate_remove(struct bridge_softc *sc, bridge_iterate_cb_t func, void *arg) 2167 { 2168 struct bridge_rtnode *brt, *nbrt; 2169 struct bridge_rtnode **brt_list; 2170 int i, count; 2171 2172 retry: 2173 count = sc->sc_brtcnt; 2174 if (count == 0) 2175 return; 2176 brt_list = kmem_alloc(sizeof(struct bridge_rtnode *) * count, KM_SLEEP); 2177 2178 BRIDGE_RT_LOCK(sc); 2179 BRIDGE_RT_INTR_LOCK(sc); 2180 if (__predict_false(sc->sc_brtcnt > count)) { 2181 /* The rtnodes increased, we need more memory */ 2182 BRIDGE_RT_INTR_UNLOCK(sc); 2183 BRIDGE_RT_UNLOCK(sc); 2184 kmem_free(brt_list, sizeof(*brt_list) * count); 2185 goto retry; 2186 } 2187 2188 i = 0; 2189 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2190 bool need_break = false; 2191 if (func(sc, brt, &need_break, arg)) { 2192 bridge_rtnode_remove(sc, brt); 2193 brt_list[i++] = brt; 2194 } 2195 if (need_break) 2196 break; 2197 } 2198 BRIDGE_RT_INTR_UNLOCK(sc); 2199 2200 if (i > 0) 2201 BRIDGE_RT_PSZ_PERFORM(sc); 2202 BRIDGE_RT_UNLOCK(sc); 2203 2204 while (--i >= 0) 2205 bridge_rtnode_destroy(brt_list[i]); 2206 2207 kmem_free(brt_list, sizeof(*brt_list) * count); 2208 } 2209 2210 static bool 2211 bridge_rttrim0_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2212 bool *need_break, void *arg) 2213 { 2214 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2215 /* Take into account of the subsequent removal */ 2216 if ((sc->sc_brtcnt - 1) <= sc->sc_brtmax) 2217 *need_break = true; 2218 return true; 2219 } else 2220 return false; 2221 } 2222 2223 static void 2224 bridge_rttrim0(struct bridge_softc *sc) 2225 { 2226 bridge_rtlist_iterate_remove(sc, bridge_rttrim0_cb, NULL); 2227 } 2228 2229 /* 2230 * bridge_rttrim: 2231 * 2232 * Trim the routine table so that we have a number 2233 * of routing entries less than or equal to the 2234 * maximum number. 2235 */ 2236 static void 2237 bridge_rttrim(struct bridge_softc *sc) 2238 { 2239 2240 /* Make sure we actually need to do this. */ 2241 if (sc->sc_brtcnt <= sc->sc_brtmax) 2242 return; 2243 2244 /* Force an aging cycle; this might trim enough addresses. */ 2245 bridge_rtage(sc); 2246 if (sc->sc_brtcnt <= sc->sc_brtmax) 2247 return; 2248 2249 bridge_rttrim0(sc); 2250 2251 return; 2252 } 2253 2254 /* 2255 * bridge_timer: 2256 * 2257 * Aging timer for the bridge. 2258 */ 2259 static void 2260 bridge_timer(void *arg) 2261 { 2262 struct bridge_softc *sc = arg; 2263 2264 workqueue_enqueue(sc->sc_rtage_wq, &bridge_rtage_wk, NULL); 2265 } 2266 2267 static void 2268 bridge_rtage_work(struct work *wk, void *arg) 2269 { 2270 struct bridge_softc *sc = arg; 2271 2272 KASSERT(wk == &bridge_rtage_wk); 2273 2274 bridge_rtage(sc); 2275 2276 if (sc->sc_if.if_flags & IFF_RUNNING) 2277 callout_reset(&sc->sc_brcallout, 2278 bridge_rtable_prune_period * hz, bridge_timer, sc); 2279 } 2280 2281 static bool 2282 bridge_rtage_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2283 bool *need_break, void *arg) 2284 { 2285 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2286 time_uptime >= brt->brt_expire) 2287 return true; 2288 else 2289 return false; 2290 } 2291 2292 /* 2293 * bridge_rtage: 2294 * 2295 * Perform an aging cycle. 2296 */ 2297 static void 2298 bridge_rtage(struct bridge_softc *sc) 2299 { 2300 bridge_rtlist_iterate_remove(sc, bridge_rtage_cb, NULL); 2301 } 2302 2303 2304 static bool 2305 bridge_rtflush_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2306 bool *need_break, void *arg) 2307 { 2308 int full = *(int*)arg; 2309 2310 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2311 return true; 2312 else 2313 return false; 2314 } 2315 2316 /* 2317 * bridge_rtflush: 2318 * 2319 * Remove all dynamic addresses from the bridge. 2320 */ 2321 static void 2322 bridge_rtflush(struct bridge_softc *sc, int full) 2323 { 2324 bridge_rtlist_iterate_remove(sc, bridge_rtflush_cb, &full); 2325 } 2326 2327 /* 2328 * bridge_rtdaddr: 2329 * 2330 * Remove an address from the table. 2331 */ 2332 static int 2333 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2334 { 2335 struct bridge_rtnode *brt; 2336 2337 BRIDGE_RT_LOCK(sc); 2338 BRIDGE_RT_INTR_LOCK(sc); 2339 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2340 BRIDGE_RT_INTR_UNLOCK(sc); 2341 BRIDGE_RT_UNLOCK(sc); 2342 return ENOENT; 2343 } 2344 bridge_rtnode_remove(sc, brt); 2345 BRIDGE_RT_INTR_UNLOCK(sc); 2346 BRIDGE_RT_PSZ_PERFORM(sc); 2347 BRIDGE_RT_UNLOCK(sc); 2348 2349 bridge_rtnode_destroy(brt); 2350 2351 return 0; 2352 } 2353 2354 /* 2355 * bridge_rtdelete: 2356 * 2357 * Delete routes to a speicifc member interface. 2358 */ 2359 static void 2360 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2361 { 2362 struct bridge_rtnode *brt, *nbrt; 2363 2364 BRIDGE_RT_LOCK(sc); 2365 BRIDGE_RT_INTR_LOCK(sc); 2366 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2367 if (brt->brt_ifp == ifp) 2368 break; 2369 } 2370 if (brt == NULL) { 2371 BRIDGE_RT_INTR_UNLOCK(sc); 2372 BRIDGE_RT_UNLOCK(sc); 2373 return; 2374 } 2375 bridge_rtnode_remove(sc, brt); 2376 BRIDGE_RT_INTR_UNLOCK(sc); 2377 BRIDGE_RT_PSZ_PERFORM(sc); 2378 BRIDGE_RT_UNLOCK(sc); 2379 2380 bridge_rtnode_destroy(brt); 2381 } 2382 2383 /* 2384 * bridge_rtable_init: 2385 * 2386 * Initialize the route table for this bridge. 2387 */ 2388 static void 2389 bridge_rtable_init(struct bridge_softc *sc) 2390 { 2391 int i; 2392 2393 sc->sc_rthash = kmem_alloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2394 KM_SLEEP); 2395 2396 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2397 LIST_INIT(&sc->sc_rthash[i]); 2398 2399 sc->sc_rthash_key = cprng_fast32(); 2400 2401 LIST_INIT(&sc->sc_rtlist); 2402 2403 sc->sc_rtlist_intr_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NET); 2404 #ifdef BRIDGE_MPSAFE 2405 sc->sc_rtlist_psz = pserialize_create(); 2406 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 2407 #else 2408 sc->sc_rtlist_psz = NULL; 2409 sc->sc_rtlist_lock = NULL; 2410 #endif 2411 } 2412 2413 /* 2414 * bridge_rtable_fini: 2415 * 2416 * Deconstruct the route table for this bridge. 2417 */ 2418 static void 2419 bridge_rtable_fini(struct bridge_softc *sc) 2420 { 2421 2422 kmem_free(sc->sc_rthash, sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE); 2423 if (sc->sc_rtlist_intr_lock) 2424 mutex_obj_free(sc->sc_rtlist_intr_lock); 2425 if (sc->sc_rtlist_lock) 2426 mutex_obj_free(sc->sc_rtlist_lock); 2427 if (sc->sc_rtlist_psz) 2428 pserialize_destroy(sc->sc_rtlist_psz); 2429 } 2430 2431 /* 2432 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2433 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2434 */ 2435 #define mix(a, b, c) \ 2436 do { \ 2437 a -= b; a -= c; a ^= (c >> 13); \ 2438 b -= c; b -= a; b ^= (a << 8); \ 2439 c -= a; c -= b; c ^= (b >> 13); \ 2440 a -= b; a -= c; a ^= (c >> 12); \ 2441 b -= c; b -= a; b ^= (a << 16); \ 2442 c -= a; c -= b; c ^= (b >> 5); \ 2443 a -= b; a -= c; a ^= (c >> 3); \ 2444 b -= c; b -= a; b ^= (a << 10); \ 2445 c -= a; c -= b; c ^= (b >> 15); \ 2446 } while (/*CONSTCOND*/0) 2447 2448 static inline uint32_t 2449 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2450 { 2451 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2452 2453 b += addr[5] << 8; 2454 b += addr[4]; 2455 a += addr[3] << 24; 2456 a += addr[2] << 16; 2457 a += addr[1] << 8; 2458 a += addr[0]; 2459 2460 mix(a, b, c); 2461 2462 return (c & BRIDGE_RTHASH_MASK); 2463 } 2464 2465 #undef mix 2466 2467 /* 2468 * bridge_rtnode_lookup: 2469 * 2470 * Look up a bridge route node for the specified destination. 2471 */ 2472 static struct bridge_rtnode * 2473 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2474 { 2475 struct bridge_rtnode *brt; 2476 uint32_t hash; 2477 int dir; 2478 2479 hash = bridge_rthash(sc, addr); 2480 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2481 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2482 if (dir == 0) 2483 return (brt); 2484 if (dir > 0) 2485 return (NULL); 2486 } 2487 2488 return (NULL); 2489 } 2490 2491 /* 2492 * bridge_rtnode_insert: 2493 * 2494 * Insert the specified bridge node into the route table. We 2495 * assume the entry is not already in the table. 2496 */ 2497 static int 2498 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2499 { 2500 struct bridge_rtnode *lbrt; 2501 uint32_t hash; 2502 int dir; 2503 2504 KASSERT(BRIDGE_RT_INTR_LOCKED(sc)); 2505 2506 hash = bridge_rthash(sc, brt->brt_addr); 2507 2508 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2509 if (lbrt == NULL) { 2510 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2511 goto out; 2512 } 2513 2514 do { 2515 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2516 if (dir == 0) 2517 return (EEXIST); 2518 if (dir > 0) { 2519 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2520 goto out; 2521 } 2522 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2523 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2524 goto out; 2525 } 2526 lbrt = LIST_NEXT(lbrt, brt_hash); 2527 } while (lbrt != NULL); 2528 2529 #ifdef DIAGNOSTIC 2530 panic("bridge_rtnode_insert: impossible"); 2531 #endif 2532 2533 out: 2534 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2535 sc->sc_brtcnt++; 2536 2537 return (0); 2538 } 2539 2540 /* 2541 * bridge_rtnode_remove: 2542 * 2543 * Remove a bridge rtnode from the rthash and the rtlist of a bridge. 2544 */ 2545 static void 2546 bridge_rtnode_remove(struct bridge_softc *sc, struct bridge_rtnode *brt) 2547 { 2548 2549 KASSERT(BRIDGE_RT_INTR_LOCKED(sc)); 2550 2551 LIST_REMOVE(brt, brt_hash); 2552 LIST_REMOVE(brt, brt_list); 2553 sc->sc_brtcnt--; 2554 } 2555 2556 /* 2557 * bridge_rtnode_destroy: 2558 * 2559 * Destroy a bridge rtnode. 2560 */ 2561 static void 2562 bridge_rtnode_destroy(struct bridge_rtnode *brt) 2563 { 2564 2565 pool_put(&bridge_rtnode_pool, brt); 2566 } 2567 2568 #if defined(BRIDGE_IPF) 2569 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2570 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2571 2572 /* 2573 * Send bridge packets through IPF if they are one of the types IPF can deal 2574 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2575 * question.) 2576 */ 2577 static int 2578 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2579 { 2580 int snap, error; 2581 struct ether_header *eh1, eh2; 2582 struct llc llc1; 2583 uint16_t ether_type; 2584 2585 snap = 0; 2586 error = -1; /* Default error if not error == 0 */ 2587 eh1 = mtod(*mp, struct ether_header *); 2588 ether_type = ntohs(eh1->ether_type); 2589 2590 /* 2591 * Check for SNAP/LLC. 2592 */ 2593 if (ether_type < ETHERMTU) { 2594 struct llc *llc2 = (struct llc *)(eh1 + 1); 2595 2596 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2597 llc2->llc_dsap == LLC_SNAP_LSAP && 2598 llc2->llc_ssap == LLC_SNAP_LSAP && 2599 llc2->llc_control == LLC_UI) { 2600 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2601 snap = 1; 2602 } 2603 } 2604 2605 /* 2606 * If we're trying to filter bridge traffic, don't look at anything 2607 * other than IP and ARP traffic. If the filter doesn't understand 2608 * IPv6, don't allow IPv6 through the bridge either. This is lame 2609 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2610 * but of course we don't have an AppleTalk filter to begin with. 2611 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2612 * ARP traffic.) 2613 */ 2614 switch (ether_type) { 2615 case ETHERTYPE_ARP: 2616 case ETHERTYPE_REVARP: 2617 return 0; /* Automatically pass */ 2618 case ETHERTYPE_IP: 2619 # ifdef INET6 2620 case ETHERTYPE_IPV6: 2621 # endif /* INET6 */ 2622 break; 2623 default: 2624 goto bad; 2625 } 2626 2627 /* Strip off the Ethernet header and keep a copy. */ 2628 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2629 m_adj(*mp, ETHER_HDR_LEN); 2630 2631 /* Strip off snap header, if present */ 2632 if (snap) { 2633 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2634 m_adj(*mp, sizeof(struct llc)); 2635 } 2636 2637 /* 2638 * Check basic packet sanity and run IPF through pfil. 2639 */ 2640 KASSERT(!cpu_intr_p()); 2641 switch (ether_type) 2642 { 2643 case ETHERTYPE_IP : 2644 error = (dir == PFIL_IN) ? bridge_ip_checkbasic(mp) : 0; 2645 if (error == 0) 2646 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2647 break; 2648 # ifdef INET6 2649 case ETHERTYPE_IPV6 : 2650 error = (dir == PFIL_IN) ? bridge_ip6_checkbasic(mp) : 0; 2651 if (error == 0) 2652 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2653 break; 2654 # endif 2655 default : 2656 error = 0; 2657 break; 2658 } 2659 2660 if (*mp == NULL) 2661 return error; 2662 if (error != 0) 2663 goto bad; 2664 2665 error = -1; 2666 2667 /* 2668 * Finally, put everything back the way it was and return 2669 */ 2670 if (snap) { 2671 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2672 if (*mp == NULL) 2673 return error; 2674 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2675 } 2676 2677 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2678 if (*mp == NULL) 2679 return error; 2680 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2681 2682 return 0; 2683 2684 bad: 2685 m_freem(*mp); 2686 *mp = NULL; 2687 return error; 2688 } 2689 2690 /* 2691 * Perform basic checks on header size since 2692 * IPF assumes ip_input has already processed 2693 * it for it. Cut-and-pasted from ip_input.c. 2694 * Given how simple the IPv6 version is, 2695 * does the IPv4 version really need to be 2696 * this complicated? 2697 * 2698 * XXX Should we update ipstat here, or not? 2699 * XXX Right now we update ipstat but not 2700 * XXX csum_counter. 2701 */ 2702 static int 2703 bridge_ip_checkbasic(struct mbuf **mp) 2704 { 2705 struct mbuf *m = *mp; 2706 struct ip *ip; 2707 int len, hlen; 2708 2709 if (*mp == NULL) 2710 return -1; 2711 2712 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2713 if ((m = m_copyup(m, sizeof(struct ip), 2714 (max_linkhdr + 3) & ~3)) == NULL) { 2715 /* XXXJRT new stat, please */ 2716 ip_statinc(IP_STAT_TOOSMALL); 2717 goto bad; 2718 } 2719 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2720 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2721 ip_statinc(IP_STAT_TOOSMALL); 2722 goto bad; 2723 } 2724 } 2725 ip = mtod(m, struct ip *); 2726 if (ip == NULL) goto bad; 2727 2728 if (ip->ip_v != IPVERSION) { 2729 ip_statinc(IP_STAT_BADVERS); 2730 goto bad; 2731 } 2732 hlen = ip->ip_hl << 2; 2733 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2734 ip_statinc(IP_STAT_BADHLEN); 2735 goto bad; 2736 } 2737 if (hlen > m->m_len) { 2738 if ((m = m_pullup(m, hlen)) == 0) { 2739 ip_statinc(IP_STAT_BADHLEN); 2740 goto bad; 2741 } 2742 ip = mtod(m, struct ip *); 2743 if (ip == NULL) goto bad; 2744 } 2745 2746 switch (m->m_pkthdr.csum_flags & 2747 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 2748 M_CSUM_IPv4_BAD)) { 2749 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2750 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2751 goto bad; 2752 2753 case M_CSUM_IPv4: 2754 /* Checksum was okay. */ 2755 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2756 break; 2757 2758 default: 2759 /* Must compute it ourselves. */ 2760 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2761 if (in_cksum(m, hlen) != 0) 2762 goto bad; 2763 break; 2764 } 2765 2766 /* Retrieve the packet length. */ 2767 len = ntohs(ip->ip_len); 2768 2769 /* 2770 * Check for additional length bogosity 2771 */ 2772 if (len < hlen) { 2773 ip_statinc(IP_STAT_BADLEN); 2774 goto bad; 2775 } 2776 2777 /* 2778 * Check that the amount of data in the buffers 2779 * is as at least much as the IP header would have us expect. 2780 * Drop packet if shorter than we expect. 2781 */ 2782 if (m->m_pkthdr.len < len) { 2783 ip_statinc(IP_STAT_TOOSHORT); 2784 goto bad; 2785 } 2786 2787 /* Checks out, proceed */ 2788 *mp = m; 2789 return 0; 2790 2791 bad: 2792 *mp = m; 2793 return -1; 2794 } 2795 2796 # ifdef INET6 2797 /* 2798 * Same as above, but for IPv6. 2799 * Cut-and-pasted from ip6_input.c. 2800 * XXX Should we update ip6stat, or not? 2801 */ 2802 static int 2803 bridge_ip6_checkbasic(struct mbuf **mp) 2804 { 2805 struct mbuf *m = *mp; 2806 struct ip6_hdr *ip6; 2807 2808 /* 2809 * If the IPv6 header is not aligned, slurp it up into a new 2810 * mbuf with space for link headers, in the event we forward 2811 * it. Otherwise, if it is aligned, make sure the entire base 2812 * IPv6 header is in the first mbuf of the chain. 2813 */ 2814 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2815 struct ifnet *inifp = m->m_pkthdr.rcvif; 2816 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2817 (max_linkhdr + 3) & ~3)) == NULL) { 2818 /* XXXJRT new stat, please */ 2819 ip6_statinc(IP6_STAT_TOOSMALL); 2820 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2821 goto bad; 2822 } 2823 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2824 struct ifnet *inifp = m->m_pkthdr.rcvif; 2825 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2826 ip6_statinc(IP6_STAT_TOOSMALL); 2827 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2828 goto bad; 2829 } 2830 } 2831 2832 ip6 = mtod(m, struct ip6_hdr *); 2833 2834 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2835 ip6_statinc(IP6_STAT_BADVERS); 2836 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 2837 goto bad; 2838 } 2839 2840 /* Checks out, proceed */ 2841 *mp = m; 2842 return 0; 2843 2844 bad: 2845 *mp = m; 2846 return -1; 2847 } 2848 # endif /* INET6 */ 2849 #endif /* BRIDGE_IPF */ 2850