if_bridge.c revision 1.91.2.4
1 /* $NetBSD: if_bridge.c,v 1.91.2.4 2015/12/27 12:10:06 skrll 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 1.91.2.4 2015/12/27 12:10:06 skrll 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 if ((error = ether_enable_vlan_mtu(ifs)) > 0) 897 goto out; 898 /* 899 * Place the interface into promiscuous mode. 900 */ 901 error = ifpromisc(ifs, 1); 902 if (error) 903 goto out; 904 break; 905 default: 906 error = EINVAL; 907 goto out; 908 } 909 910 bif->bif_ifp = ifs; 911 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 912 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 913 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 914 bif->bif_refs = 0; 915 bif->bif_waiting = false; 916 917 BRIDGE_LOCK(sc); 918 919 ifs->if_bridge = sc; 920 ifs->if_bridgeif = bif; 921 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 922 ifs->if_input = bridge_input; 923 924 BRIDGE_UNLOCK(sc); 925 926 if (sc->sc_if.if_flags & IFF_RUNNING) 927 bstp_initialization(sc); 928 else 929 bstp_stop(sc); 930 931 out: 932 if (error) { 933 if (bif != NULL) 934 kmem_free(bif, sizeof(*bif)); 935 } 936 return (error); 937 } 938 939 static int 940 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 941 { 942 struct ifbreq *req = arg; 943 const char *name = req->ifbr_ifsname; 944 struct bridge_iflist *bif; 945 struct ifnet *ifs; 946 947 BRIDGE_LOCK(sc); 948 949 /* 950 * Don't use bridge_lookup_member. We want to get a member 951 * with bif_refs == 0. 952 */ 953 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 954 ifs = bif->bif_ifp; 955 if (strcmp(ifs->if_xname, name) == 0) 956 break; 957 } 958 959 if (bif == NULL) { 960 BRIDGE_UNLOCK(sc); 961 return ENOENT; 962 } 963 964 bridge_delete_member(sc, bif); 965 966 BRIDGE_UNLOCK(sc); 967 968 switch (ifs->if_type) { 969 case IFT_ETHER: 970 /* 971 * Take the interface out of promiscuous mode. 972 * Don't call it with holding a spin lock. 973 */ 974 (void) ifpromisc(ifs, 0); 975 (void) ether_disable_vlan_mtu(ifs); 976 break; 977 default: 978 #ifdef DIAGNOSTIC 979 panic("bridge_delete_member: impossible"); 980 #endif 981 break; 982 } 983 984 bridge_rtdelete(sc, ifs); 985 986 if (sc->sc_if.if_flags & IFF_RUNNING) 987 bstp_initialization(sc); 988 989 return 0; 990 } 991 992 static int 993 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 994 { 995 struct ifbreq *req = arg; 996 struct bridge_iflist *bif; 997 998 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 999 if (bif == NULL) 1000 return (ENOENT); 1001 1002 req->ifbr_ifsflags = bif->bif_flags; 1003 req->ifbr_state = bif->bif_state; 1004 req->ifbr_priority = bif->bif_priority; 1005 req->ifbr_path_cost = bif->bif_path_cost; 1006 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 1007 1008 bridge_release_member(sc, bif); 1009 1010 return (0); 1011 } 1012 1013 static int 1014 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1015 { 1016 struct ifbreq *req = arg; 1017 struct bridge_iflist *bif; 1018 1019 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1020 if (bif == NULL) 1021 return (ENOENT); 1022 1023 if (req->ifbr_ifsflags & IFBIF_STP) { 1024 switch (bif->bif_ifp->if_type) { 1025 case IFT_ETHER: 1026 /* These can do spanning tree. */ 1027 break; 1028 1029 default: 1030 /* Nothing else can. */ 1031 bridge_release_member(sc, bif); 1032 return (EINVAL); 1033 } 1034 } 1035 1036 bif->bif_flags = req->ifbr_ifsflags; 1037 1038 bridge_release_member(sc, bif); 1039 1040 if (sc->sc_if.if_flags & IFF_RUNNING) 1041 bstp_initialization(sc); 1042 1043 return (0); 1044 } 1045 1046 static int 1047 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1048 { 1049 struct ifbrparam *param = arg; 1050 1051 sc->sc_brtmax = param->ifbrp_csize; 1052 bridge_rttrim(sc); 1053 1054 return (0); 1055 } 1056 1057 static int 1058 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1059 { 1060 struct ifbrparam *param = arg; 1061 1062 param->ifbrp_csize = sc->sc_brtmax; 1063 1064 return (0); 1065 } 1066 1067 static int 1068 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1069 { 1070 struct ifbifconf *bifc = arg; 1071 struct bridge_iflist *bif; 1072 struct ifbreq *breqs; 1073 int i, count, error = 0; 1074 1075 retry: 1076 BRIDGE_LOCK(sc); 1077 count = 0; 1078 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1079 count++; 1080 BRIDGE_UNLOCK(sc); 1081 1082 if (count == 0) { 1083 bifc->ifbic_len = 0; 1084 return 0; 1085 } 1086 1087 if (bifc->ifbic_len == 0 || bifc->ifbic_len < (sizeof(*breqs) * count)) { 1088 /* Tell that a larger buffer is needed */ 1089 bifc->ifbic_len = sizeof(*breqs) * count; 1090 return 0; 1091 } 1092 1093 breqs = kmem_alloc(sizeof(*breqs) * count, KM_SLEEP); 1094 1095 BRIDGE_LOCK(sc); 1096 1097 i = 0; 1098 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1099 i++; 1100 if (i > count) { 1101 /* 1102 * The number of members has been increased. 1103 * We need more memory! 1104 */ 1105 BRIDGE_UNLOCK(sc); 1106 kmem_free(breqs, sizeof(*breqs) * count); 1107 goto retry; 1108 } 1109 1110 i = 0; 1111 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1112 struct ifbreq *breq = &breqs[i++]; 1113 memset(breq, 0, sizeof(*breq)); 1114 1115 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, 1116 sizeof(breq->ifbr_ifsname)); 1117 breq->ifbr_ifsflags = bif->bif_flags; 1118 breq->ifbr_state = bif->bif_state; 1119 breq->ifbr_priority = bif->bif_priority; 1120 breq->ifbr_path_cost = bif->bif_path_cost; 1121 breq->ifbr_portno = bif->bif_ifp->if_index & 0xff; 1122 } 1123 1124 /* Don't call copyout with holding the mutex */ 1125 BRIDGE_UNLOCK(sc); 1126 1127 for (i = 0; i < count; i++) { 1128 error = copyout(&breqs[i], bifc->ifbic_req + i, sizeof(*breqs)); 1129 if (error) 1130 break; 1131 } 1132 bifc->ifbic_len = sizeof(*breqs) * i; 1133 1134 kmem_free(breqs, sizeof(*breqs) * count); 1135 1136 return error; 1137 } 1138 1139 static int 1140 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1141 { 1142 struct ifbaconf *bac = arg; 1143 struct bridge_rtnode *brt; 1144 struct ifbareq bareq; 1145 int count = 0, error = 0, len; 1146 1147 if (bac->ifbac_len == 0) 1148 return (0); 1149 1150 BRIDGE_RT_INTR_LOCK(sc); 1151 1152 len = bac->ifbac_len; 1153 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1154 if (len < sizeof(bareq)) 1155 goto out; 1156 memset(&bareq, 0, sizeof(bareq)); 1157 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1158 sizeof(bareq.ifba_ifsname)); 1159 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1160 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1161 bareq.ifba_expire = brt->brt_expire - time_uptime; 1162 } else 1163 bareq.ifba_expire = 0; 1164 bareq.ifba_flags = brt->brt_flags; 1165 1166 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1167 if (error) 1168 goto out; 1169 count++; 1170 len -= sizeof(bareq); 1171 } 1172 out: 1173 BRIDGE_RT_INTR_UNLOCK(sc); 1174 1175 bac->ifbac_len = sizeof(bareq) * count; 1176 return (error); 1177 } 1178 1179 static int 1180 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1181 { 1182 struct ifbareq *req = arg; 1183 struct bridge_iflist *bif; 1184 int error; 1185 1186 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1187 if (bif == NULL) 1188 return (ENOENT); 1189 1190 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1191 req->ifba_flags); 1192 1193 bridge_release_member(sc, bif); 1194 1195 return (error); 1196 } 1197 1198 static int 1199 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1200 { 1201 struct ifbrparam *param = arg; 1202 1203 sc->sc_brttimeout = param->ifbrp_ctime; 1204 1205 return (0); 1206 } 1207 1208 static int 1209 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1210 { 1211 struct ifbrparam *param = arg; 1212 1213 param->ifbrp_ctime = sc->sc_brttimeout; 1214 1215 return (0); 1216 } 1217 1218 static int 1219 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1220 { 1221 struct ifbareq *req = arg; 1222 1223 return (bridge_rtdaddr(sc, req->ifba_dst)); 1224 } 1225 1226 static int 1227 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1228 { 1229 struct ifbreq *req = arg; 1230 1231 bridge_rtflush(sc, req->ifbr_ifsflags); 1232 1233 return (0); 1234 } 1235 1236 static int 1237 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1238 { 1239 struct ifbrparam *param = arg; 1240 1241 param->ifbrp_prio = sc->sc_bridge_priority; 1242 1243 return (0); 1244 } 1245 1246 static int 1247 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1248 { 1249 struct ifbrparam *param = arg; 1250 1251 sc->sc_bridge_priority = param->ifbrp_prio; 1252 1253 if (sc->sc_if.if_flags & IFF_RUNNING) 1254 bstp_initialization(sc); 1255 1256 return (0); 1257 } 1258 1259 static int 1260 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1261 { 1262 struct ifbrparam *param = arg; 1263 1264 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1265 1266 return (0); 1267 } 1268 1269 static int 1270 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1271 { 1272 struct ifbrparam *param = arg; 1273 1274 if (param->ifbrp_hellotime == 0) 1275 return (EINVAL); 1276 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1277 1278 if (sc->sc_if.if_flags & IFF_RUNNING) 1279 bstp_initialization(sc); 1280 1281 return (0); 1282 } 1283 1284 static int 1285 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1286 { 1287 struct ifbrparam *param = arg; 1288 1289 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1290 1291 return (0); 1292 } 1293 1294 static int 1295 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1296 { 1297 struct ifbrparam *param = arg; 1298 1299 if (param->ifbrp_fwddelay == 0) 1300 return (EINVAL); 1301 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1302 1303 if (sc->sc_if.if_flags & IFF_RUNNING) 1304 bstp_initialization(sc); 1305 1306 return (0); 1307 } 1308 1309 static int 1310 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1311 { 1312 struct ifbrparam *param = arg; 1313 1314 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1315 1316 return (0); 1317 } 1318 1319 static int 1320 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1321 { 1322 struct ifbrparam *param = arg; 1323 1324 if (param->ifbrp_maxage == 0) 1325 return (EINVAL); 1326 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1327 1328 if (sc->sc_if.if_flags & IFF_RUNNING) 1329 bstp_initialization(sc); 1330 1331 return (0); 1332 } 1333 1334 static int 1335 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1336 { 1337 struct ifbreq *req = arg; 1338 struct bridge_iflist *bif; 1339 1340 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1341 if (bif == NULL) 1342 return (ENOENT); 1343 1344 bif->bif_priority = req->ifbr_priority; 1345 1346 if (sc->sc_if.if_flags & IFF_RUNNING) 1347 bstp_initialization(sc); 1348 1349 bridge_release_member(sc, bif); 1350 1351 return (0); 1352 } 1353 1354 #if defined(BRIDGE_IPF) 1355 static int 1356 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1357 { 1358 struct ifbrparam *param = arg; 1359 1360 param->ifbrp_filter = sc->sc_filter_flags; 1361 1362 return (0); 1363 } 1364 1365 static int 1366 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1367 { 1368 struct ifbrparam *param = arg; 1369 uint32_t nflags, oflags; 1370 1371 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1372 return (EINVAL); 1373 1374 nflags = param->ifbrp_filter; 1375 oflags = sc->sc_filter_flags; 1376 1377 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1378 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1379 sc->sc_if.if_pfil); 1380 } 1381 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1382 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1383 sc->sc_if.if_pfil); 1384 } 1385 1386 sc->sc_filter_flags = nflags; 1387 1388 return (0); 1389 } 1390 #endif /* BRIDGE_IPF */ 1391 1392 static int 1393 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1394 { 1395 struct ifbreq *req = arg; 1396 struct bridge_iflist *bif; 1397 1398 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1399 if (bif == NULL) 1400 return (ENOENT); 1401 1402 bif->bif_path_cost = req->ifbr_path_cost; 1403 1404 if (sc->sc_if.if_flags & IFF_RUNNING) 1405 bstp_initialization(sc); 1406 1407 bridge_release_member(sc, bif); 1408 1409 return (0); 1410 } 1411 1412 /* 1413 * bridge_ifdetach: 1414 * 1415 * Detach an interface from a bridge. Called when a member 1416 * interface is detaching. 1417 */ 1418 void 1419 bridge_ifdetach(struct ifnet *ifp) 1420 { 1421 struct bridge_softc *sc = ifp->if_bridge; 1422 struct ifbreq breq; 1423 1424 /* ioctl_lock should prevent this from happening */ 1425 KASSERT(sc != NULL); 1426 1427 memset(&breq, 0, sizeof(breq)); 1428 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1429 1430 (void) bridge_ioctl_del(sc, &breq); 1431 } 1432 1433 /* 1434 * bridge_init: 1435 * 1436 * Initialize a bridge interface. 1437 */ 1438 static int 1439 bridge_init(struct ifnet *ifp) 1440 { 1441 struct bridge_softc *sc = ifp->if_softc; 1442 1443 if (ifp->if_flags & IFF_RUNNING) 1444 return (0); 1445 1446 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1447 bridge_timer, sc); 1448 1449 ifp->if_flags |= IFF_RUNNING; 1450 bstp_initialization(sc); 1451 return (0); 1452 } 1453 1454 /* 1455 * bridge_stop: 1456 * 1457 * Stop the bridge interface. 1458 */ 1459 static void 1460 bridge_stop(struct ifnet *ifp, int disable) 1461 { 1462 struct bridge_softc *sc = ifp->if_softc; 1463 1464 if ((ifp->if_flags & IFF_RUNNING) == 0) 1465 return; 1466 1467 callout_stop(&sc->sc_brcallout); 1468 bstp_stop(sc); 1469 1470 bridge_rtflush(sc, IFBF_FLUSHDYN); 1471 1472 ifp->if_flags &= ~IFF_RUNNING; 1473 } 1474 1475 /* 1476 * bridge_enqueue: 1477 * 1478 * Enqueue a packet on a bridge member interface. 1479 */ 1480 void 1481 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1482 int runfilt) 1483 { 1484 ALTQ_DECL(struct altq_pktattr pktattr;) 1485 int len, error; 1486 short mflags; 1487 1488 /* 1489 * Clear any in-bound checksum flags for this packet. 1490 */ 1491 m->m_pkthdr.csum_flags = 0; 1492 1493 if (runfilt) { 1494 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1495 dst_ifp, PFIL_OUT) != 0) { 1496 if (m != NULL) 1497 m_freem(m); 1498 return; 1499 } 1500 if (m == NULL) 1501 return; 1502 } 1503 1504 #ifdef ALTQ 1505 /* 1506 * If ALTQ is enabled on the member interface, do 1507 * classification; the queueing discipline might 1508 * not require classification, but might require 1509 * the address family/header pointer in the pktattr. 1510 */ 1511 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1512 /* XXX IFT_ETHER */ 1513 altq_etherclassify(&dst_ifp->if_snd, m, &pktattr); 1514 } 1515 #endif /* ALTQ */ 1516 1517 len = m->m_pkthdr.len; 1518 mflags = m->m_flags; 1519 1520 IFQ_ENQUEUE(&dst_ifp->if_snd, m, &pktattr, error); 1521 1522 if (error) { 1523 /* mbuf is already freed */ 1524 sc->sc_if.if_oerrors++; 1525 return; 1526 } 1527 1528 sc->sc_if.if_opackets++; 1529 sc->sc_if.if_obytes += len; 1530 1531 dst_ifp->if_obytes += len; 1532 1533 if (mflags & M_MCAST) { 1534 sc->sc_if.if_omcasts++; 1535 dst_ifp->if_omcasts++; 1536 } 1537 1538 if ((dst_ifp->if_flags & IFF_OACTIVE) == 0) 1539 (*dst_ifp->if_start)(dst_ifp); 1540 } 1541 1542 /* 1543 * bridge_output: 1544 * 1545 * Send output from a bridge member interface. This 1546 * performs the bridging function for locally originated 1547 * packets. 1548 * 1549 * The mbuf has the Ethernet header already attached. We must 1550 * enqueue or free the mbuf before returning. 1551 */ 1552 int 1553 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1554 struct rtentry *rt) 1555 { 1556 struct ether_header *eh; 1557 struct ifnet *dst_if; 1558 struct bridge_softc *sc; 1559 #ifndef BRIDGE_MPSAFE 1560 int s; 1561 #endif 1562 1563 if (m->m_len < ETHER_HDR_LEN) { 1564 m = m_pullup(m, ETHER_HDR_LEN); 1565 if (m == NULL) 1566 return (0); 1567 } 1568 1569 eh = mtod(m, struct ether_header *); 1570 sc = ifp->if_bridge; 1571 1572 #ifndef BRIDGE_MPSAFE 1573 s = splnet(); 1574 #endif 1575 1576 /* 1577 * If bridge is down, but the original output interface is up, 1578 * go ahead and send out that interface. Otherwise, the packet 1579 * is dropped below. 1580 */ 1581 if (__predict_false(sc == NULL) || 1582 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1583 dst_if = ifp; 1584 goto sendunicast; 1585 } 1586 1587 /* 1588 * If the packet is a multicast, or we don't know a better way to 1589 * get there, send to all interfaces. 1590 */ 1591 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1592 dst_if = NULL; 1593 else 1594 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1595 if (dst_if == NULL) { 1596 struct bridge_iflist *bif; 1597 struct mbuf *mc; 1598 int used = 0; 1599 int ss; 1600 1601 BRIDGE_PSZ_RENTER(ss); 1602 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1603 bif = bridge_try_hold_bif(bif); 1604 if (bif == NULL) 1605 continue; 1606 BRIDGE_PSZ_REXIT(ss); 1607 1608 dst_if = bif->bif_ifp; 1609 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1610 goto next; 1611 1612 /* 1613 * If this is not the original output interface, 1614 * and the interface is participating in spanning 1615 * tree, make sure the port is in a state that 1616 * allows forwarding. 1617 */ 1618 if (dst_if != ifp && 1619 (bif->bif_flags & IFBIF_STP) != 0) { 1620 switch (bif->bif_state) { 1621 case BSTP_IFSTATE_BLOCKING: 1622 case BSTP_IFSTATE_LISTENING: 1623 case BSTP_IFSTATE_DISABLED: 1624 goto next; 1625 } 1626 } 1627 1628 if (LIST_NEXT(bif, bif_next) == NULL) { 1629 used = 1; 1630 mc = m; 1631 } else { 1632 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1633 if (mc == NULL) { 1634 sc->sc_if.if_oerrors++; 1635 goto next; 1636 } 1637 } 1638 1639 bridge_enqueue(sc, dst_if, mc, 0); 1640 next: 1641 bridge_release_member(sc, bif); 1642 BRIDGE_PSZ_RENTER(ss); 1643 } 1644 BRIDGE_PSZ_REXIT(ss); 1645 1646 if (used == 0) 1647 m_freem(m); 1648 #ifndef BRIDGE_MPSAFE 1649 splx(s); 1650 #endif 1651 return (0); 1652 } 1653 1654 sendunicast: 1655 /* 1656 * XXX Spanning tree consideration here? 1657 */ 1658 1659 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1660 m_freem(m); 1661 #ifndef BRIDGE_MPSAFE 1662 splx(s); 1663 #endif 1664 return (0); 1665 } 1666 1667 bridge_enqueue(sc, dst_if, m, 0); 1668 1669 #ifndef BRIDGE_MPSAFE 1670 splx(s); 1671 #endif 1672 return (0); 1673 } 1674 1675 /* 1676 * bridge_start: 1677 * 1678 * Start output on a bridge. 1679 * 1680 * NOTE: This routine should never be called in this implementation. 1681 */ 1682 static void 1683 bridge_start(struct ifnet *ifp) 1684 { 1685 1686 printf("%s: bridge_start() called\n", ifp->if_xname); 1687 } 1688 1689 /* 1690 * bridge_forward: 1691 * 1692 * The forwarding function of the bridge. 1693 */ 1694 static void 1695 bridge_forward(void *v) 1696 { 1697 struct bridge_softc *sc = v; 1698 struct mbuf *m; 1699 struct bridge_iflist *bif; 1700 struct ifnet *src_if, *dst_if; 1701 struct ether_header *eh; 1702 #ifndef BRIDGE_MPSAFE 1703 int s; 1704 1705 KERNEL_LOCK(1, NULL); 1706 mutex_enter(softnet_lock); 1707 #endif 1708 1709 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1710 #ifndef BRIDGE_MPSAFE 1711 mutex_exit(softnet_lock); 1712 KERNEL_UNLOCK_ONE(NULL); 1713 #endif 1714 return; 1715 } 1716 1717 #ifndef BRIDGE_MPSAFE 1718 s = splnet(); 1719 #endif 1720 while ((m = pktq_dequeue(sc->sc_fwd_pktq)) != NULL) { 1721 src_if = m->m_pkthdr.rcvif; 1722 1723 sc->sc_if.if_ipackets++; 1724 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1725 1726 /* 1727 * Look up the bridge_iflist. 1728 */ 1729 bif = bridge_lookup_member_if(sc, src_if); 1730 if (bif == NULL) { 1731 /* Interface is not a bridge member (anymore?) */ 1732 m_freem(m); 1733 continue; 1734 } 1735 1736 if (bif->bif_flags & IFBIF_STP) { 1737 switch (bif->bif_state) { 1738 case BSTP_IFSTATE_BLOCKING: 1739 case BSTP_IFSTATE_LISTENING: 1740 case BSTP_IFSTATE_DISABLED: 1741 m_freem(m); 1742 bridge_release_member(sc, bif); 1743 continue; 1744 } 1745 } 1746 1747 eh = mtod(m, struct ether_header *); 1748 1749 /* 1750 * If the interface is learning, and the source 1751 * address is valid and not multicast, record 1752 * the address. 1753 */ 1754 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1755 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1756 (eh->ether_shost[0] == 0 && 1757 eh->ether_shost[1] == 0 && 1758 eh->ether_shost[2] == 0 && 1759 eh->ether_shost[3] == 0 && 1760 eh->ether_shost[4] == 0 && 1761 eh->ether_shost[5] == 0) == 0) { 1762 (void) bridge_rtupdate(sc, eh->ether_shost, 1763 src_if, 0, IFBAF_DYNAMIC); 1764 } 1765 1766 if ((bif->bif_flags & IFBIF_STP) != 0 && 1767 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1768 m_freem(m); 1769 bridge_release_member(sc, bif); 1770 continue; 1771 } 1772 1773 bridge_release_member(sc, bif); 1774 1775 /* 1776 * At this point, the port either doesn't participate 1777 * in spanning tree or it is in the forwarding state. 1778 */ 1779 1780 /* 1781 * If the packet is unicast, destined for someone on 1782 * "this" side of the bridge, drop it. 1783 */ 1784 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1785 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1786 if (src_if == dst_if) { 1787 m_freem(m); 1788 continue; 1789 } 1790 } else { 1791 /* ...forward it to all interfaces. */ 1792 sc->sc_if.if_imcasts++; 1793 dst_if = NULL; 1794 } 1795 1796 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1797 m->m_pkthdr.rcvif, PFIL_IN) != 0) { 1798 if (m != NULL) 1799 m_freem(m); 1800 continue; 1801 } 1802 if (m == NULL) 1803 continue; 1804 1805 if (dst_if == NULL) { 1806 bridge_broadcast(sc, src_if, m); 1807 continue; 1808 } 1809 1810 /* 1811 * At this point, we're dealing with a unicast frame 1812 * going to a different interface. 1813 */ 1814 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1815 m_freem(m); 1816 continue; 1817 } 1818 1819 bif = bridge_lookup_member_if(sc, dst_if); 1820 if (bif == NULL) { 1821 /* Not a member of the bridge (anymore?) */ 1822 m_freem(m); 1823 continue; 1824 } 1825 1826 if (bif->bif_flags & IFBIF_STP) { 1827 switch (bif->bif_state) { 1828 case BSTP_IFSTATE_DISABLED: 1829 case BSTP_IFSTATE_BLOCKING: 1830 m_freem(m); 1831 bridge_release_member(sc, bif); 1832 continue; 1833 } 1834 } 1835 1836 bridge_release_member(sc, bif); 1837 1838 bridge_enqueue(sc, dst_if, m, 1); 1839 } 1840 #ifndef BRIDGE_MPSAFE 1841 splx(s); 1842 mutex_exit(softnet_lock); 1843 KERNEL_UNLOCK_ONE(NULL); 1844 #endif 1845 } 1846 1847 static bool 1848 bstp_state_before_learning(struct bridge_iflist *bif) 1849 { 1850 if (bif->bif_flags & IFBIF_STP) { 1851 switch (bif->bif_state) { 1852 case BSTP_IFSTATE_BLOCKING: 1853 case BSTP_IFSTATE_LISTENING: 1854 case BSTP_IFSTATE_DISABLED: 1855 return true; 1856 } 1857 } 1858 return false; 1859 } 1860 1861 static bool 1862 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1863 { 1864 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1865 1866 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1867 #if NCARP > 0 1868 || (bif->bif_ifp->if_carp && 1869 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1870 #endif /* NCARP > 0 */ 1871 ) 1872 return true; 1873 1874 return false; 1875 } 1876 1877 /* 1878 * bridge_input: 1879 * 1880 * Receive input from a member interface. Queue the packet for 1881 * bridging if it is not for us. 1882 */ 1883 static void 1884 bridge_input(struct ifnet *ifp, struct mbuf *m) 1885 { 1886 struct bridge_softc *sc = ifp->if_bridge; 1887 struct bridge_iflist *bif; 1888 struct ether_header *eh; 1889 1890 if (__predict_false(sc == NULL) || 1891 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1892 ether_input(ifp, m); 1893 return; 1894 } 1895 1896 bif = bridge_lookup_member_if(sc, ifp); 1897 if (bif == NULL) { 1898 ether_input(ifp, m); 1899 return; 1900 } 1901 1902 eh = mtod(m, struct ether_header *); 1903 1904 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1905 if (memcmp(etherbroadcastaddr, 1906 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1907 m->m_flags |= M_BCAST; 1908 else 1909 m->m_flags |= M_MCAST; 1910 } 1911 1912 /* 1913 * A 'fast' path for packets addressed to interfaces that are 1914 * part of this bridge. 1915 */ 1916 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 1917 !bstp_state_before_learning(bif)) { 1918 struct bridge_iflist *_bif; 1919 struct ifnet *_ifp = NULL; 1920 int s; 1921 1922 BRIDGE_PSZ_RENTER(s); 1923 LIST_FOREACH(_bif, &sc->sc_iflist, bif_next) { 1924 /* It is destined for us. */ 1925 if (bridge_ourether(_bif, eh, 0)) { 1926 _bif = bridge_try_hold_bif(_bif); 1927 BRIDGE_PSZ_REXIT(s); 1928 if (_bif == NULL) 1929 goto out; 1930 if (_bif->bif_flags & IFBIF_LEARNING) 1931 (void) bridge_rtupdate(sc, 1932 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1933 _ifp = m->m_pkthdr.rcvif = _bif->bif_ifp; 1934 bridge_release_member(sc, _bif); 1935 goto out; 1936 } 1937 1938 /* We just received a packet that we sent out. */ 1939 if (bridge_ourether(_bif, eh, 1)) 1940 break; 1941 } 1942 BRIDGE_PSZ_REXIT(s); 1943 out: 1944 1945 if (_bif != NULL) { 1946 bridge_release_member(sc, bif); 1947 if (_ifp != NULL) { 1948 m->m_flags &= ~M_PROMISC; 1949 ether_input(_ifp, m); 1950 } else 1951 m_freem(m); 1952 return; 1953 } 1954 } 1955 1956 /* Tap off 802.1D packets; they do not get forwarded. */ 1957 if (bif->bif_flags & IFBIF_STP && 1958 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 1959 bstp_input(sc, bif, m); 1960 bridge_release_member(sc, bif); 1961 return; 1962 } 1963 1964 /* 1965 * A normal switch would discard the packet here, but that's not what 1966 * we've done historically. This also prevents some obnoxious behaviour. 1967 */ 1968 if (bstp_state_before_learning(bif)) { 1969 bridge_release_member(sc, bif); 1970 ether_input(ifp, m); 1971 return; 1972 } 1973 1974 bridge_release_member(sc, bif); 1975 1976 /* Queue the packet for bridge forwarding. */ 1977 { 1978 /* 1979 * Force to enqueue to curcpu's pktq (RX can run on a CPU 1980 * other than CPU#0). XXX need fundamental solution. 1981 */ 1982 const unsigned hash = curcpu()->ci_index; 1983 1984 if (__predict_false(!pktq_enqueue(sc->sc_fwd_pktq, m, hash))) 1985 m_freem(m); 1986 } 1987 } 1988 1989 /* 1990 * bridge_broadcast: 1991 * 1992 * Send a frame to all interfaces that are members of 1993 * the bridge, except for the one on which the packet 1994 * arrived. 1995 */ 1996 static void 1997 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1998 struct mbuf *m) 1999 { 2000 struct bridge_iflist *bif; 2001 struct mbuf *mc; 2002 struct ifnet *dst_if; 2003 bool bmcast; 2004 int s; 2005 2006 bmcast = m->m_flags & (M_BCAST|M_MCAST); 2007 2008 BRIDGE_PSZ_RENTER(s); 2009 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2010 bif = bridge_try_hold_bif(bif); 2011 if (bif == NULL) 2012 continue; 2013 BRIDGE_PSZ_REXIT(s); 2014 2015 dst_if = bif->bif_ifp; 2016 2017 if (bif->bif_flags & IFBIF_STP) { 2018 switch (bif->bif_state) { 2019 case BSTP_IFSTATE_BLOCKING: 2020 case BSTP_IFSTATE_DISABLED: 2021 goto next; 2022 } 2023 } 2024 2025 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 2026 goto next; 2027 2028 if ((dst_if->if_flags & IFF_RUNNING) == 0) 2029 goto next; 2030 2031 if (dst_if != src_if) { 2032 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 2033 if (mc == NULL) { 2034 sc->sc_if.if_oerrors++; 2035 goto next; 2036 } 2037 bridge_enqueue(sc, dst_if, mc, 1); 2038 } 2039 2040 if (bmcast) { 2041 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 2042 if (mc == NULL) { 2043 sc->sc_if.if_oerrors++; 2044 goto next; 2045 } 2046 2047 mc->m_pkthdr.rcvif = dst_if; 2048 mc->m_flags &= ~M_PROMISC; 2049 ether_input(dst_if, mc); 2050 } 2051 next: 2052 bridge_release_member(sc, bif); 2053 BRIDGE_PSZ_RENTER(s); 2054 } 2055 BRIDGE_PSZ_REXIT(s); 2056 2057 m_freem(m); 2058 } 2059 2060 static int 2061 bridge_rtalloc(struct bridge_softc *sc, const uint8_t *dst, 2062 struct bridge_rtnode **brtp) 2063 { 2064 struct bridge_rtnode *brt; 2065 int error; 2066 2067 if (sc->sc_brtcnt >= sc->sc_brtmax) 2068 return ENOSPC; 2069 2070 /* 2071 * Allocate a new bridge forwarding node, and 2072 * initialize the expiration time and Ethernet 2073 * address. 2074 */ 2075 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 2076 if (brt == NULL) 2077 return ENOMEM; 2078 2079 memset(brt, 0, sizeof(*brt)); 2080 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2081 brt->brt_flags = IFBAF_DYNAMIC; 2082 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2083 2084 BRIDGE_RT_INTR_LOCK(sc); 2085 error = bridge_rtnode_insert(sc, brt); 2086 BRIDGE_RT_INTR_UNLOCK(sc); 2087 2088 if (error != 0) { 2089 pool_put(&bridge_rtnode_pool, brt); 2090 return error; 2091 } 2092 2093 *brtp = brt; 2094 return 0; 2095 } 2096 2097 /* 2098 * bridge_rtupdate: 2099 * 2100 * Add a bridge routing entry. 2101 */ 2102 static int 2103 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 2104 struct ifnet *dst_if, int setflags, uint8_t flags) 2105 { 2106 struct bridge_rtnode *brt; 2107 int s; 2108 2109 again: 2110 /* 2111 * A route for this destination might already exist. If so, 2112 * update it, otherwise create a new one. 2113 */ 2114 BRIDGE_RT_RENTER(s); 2115 brt = bridge_rtnode_lookup(sc, dst); 2116 2117 if (brt != NULL) { 2118 brt->brt_ifp = dst_if; 2119 if (setflags) { 2120 brt->brt_flags = flags; 2121 if (flags & IFBAF_STATIC) 2122 brt->brt_expire = 0; 2123 else 2124 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2125 } else { 2126 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2127 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2128 } 2129 } 2130 BRIDGE_RT_REXIT(s); 2131 2132 if (brt == NULL) { 2133 int r; 2134 2135 r = bridge_rtalloc(sc, dst, &brt); 2136 if (r != 0) 2137 return r; 2138 goto again; 2139 } 2140 2141 return 0; 2142 } 2143 2144 /* 2145 * bridge_rtlookup: 2146 * 2147 * Lookup the destination interface for an address. 2148 */ 2149 static struct ifnet * 2150 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2151 { 2152 struct bridge_rtnode *brt; 2153 struct ifnet *ifs = NULL; 2154 int s; 2155 2156 BRIDGE_RT_RENTER(s); 2157 brt = bridge_rtnode_lookup(sc, addr); 2158 if (brt != NULL) 2159 ifs = brt->brt_ifp; 2160 BRIDGE_RT_REXIT(s); 2161 2162 return ifs; 2163 } 2164 2165 typedef bool (*bridge_iterate_cb_t) 2166 (struct bridge_softc *, struct bridge_rtnode *, bool *, void *); 2167 2168 /* 2169 * bridge_rtlist_iterate_remove: 2170 * 2171 * It iterates on sc->sc_rtlist and removes rtnodes of it which func 2172 * callback judges to remove. Removals of rtnodes are done in a manner 2173 * of pserialize. To this end, all kmem_* operations are placed out of 2174 * mutexes. 2175 */ 2176 static void 2177 bridge_rtlist_iterate_remove(struct bridge_softc *sc, bridge_iterate_cb_t func, void *arg) 2178 { 2179 struct bridge_rtnode *brt, *nbrt; 2180 struct bridge_rtnode **brt_list; 2181 int i, count; 2182 2183 retry: 2184 count = sc->sc_brtcnt; 2185 if (count == 0) 2186 return; 2187 brt_list = kmem_alloc(sizeof(*brt_list) * count, KM_SLEEP); 2188 2189 BRIDGE_RT_LOCK(sc); 2190 BRIDGE_RT_INTR_LOCK(sc); 2191 if (__predict_false(sc->sc_brtcnt > count)) { 2192 /* The rtnodes increased, we need more memory */ 2193 BRIDGE_RT_INTR_UNLOCK(sc); 2194 BRIDGE_RT_UNLOCK(sc); 2195 kmem_free(brt_list, sizeof(*brt_list) * count); 2196 goto retry; 2197 } 2198 2199 i = 0; 2200 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2201 bool need_break = false; 2202 if (func(sc, brt, &need_break, arg)) { 2203 bridge_rtnode_remove(sc, brt); 2204 brt_list[i++] = brt; 2205 } 2206 if (need_break) 2207 break; 2208 } 2209 BRIDGE_RT_INTR_UNLOCK(sc); 2210 2211 if (i > 0) 2212 BRIDGE_RT_PSZ_PERFORM(sc); 2213 BRIDGE_RT_UNLOCK(sc); 2214 2215 while (--i >= 0) 2216 bridge_rtnode_destroy(brt_list[i]); 2217 2218 kmem_free(brt_list, sizeof(*brt_list) * count); 2219 } 2220 2221 static bool 2222 bridge_rttrim0_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2223 bool *need_break, void *arg) 2224 { 2225 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2226 /* Take into account of the subsequent removal */ 2227 if ((sc->sc_brtcnt - 1) <= sc->sc_brtmax) 2228 *need_break = true; 2229 return true; 2230 } else 2231 return false; 2232 } 2233 2234 static void 2235 bridge_rttrim0(struct bridge_softc *sc) 2236 { 2237 bridge_rtlist_iterate_remove(sc, bridge_rttrim0_cb, NULL); 2238 } 2239 2240 /* 2241 * bridge_rttrim: 2242 * 2243 * Trim the routine table so that we have a number 2244 * of routing entries less than or equal to the 2245 * maximum number. 2246 */ 2247 static void 2248 bridge_rttrim(struct bridge_softc *sc) 2249 { 2250 2251 /* Make sure we actually need to do this. */ 2252 if (sc->sc_brtcnt <= sc->sc_brtmax) 2253 return; 2254 2255 /* Force an aging cycle; this might trim enough addresses. */ 2256 bridge_rtage(sc); 2257 if (sc->sc_brtcnt <= sc->sc_brtmax) 2258 return; 2259 2260 bridge_rttrim0(sc); 2261 2262 return; 2263 } 2264 2265 /* 2266 * bridge_timer: 2267 * 2268 * Aging timer for the bridge. 2269 */ 2270 static void 2271 bridge_timer(void *arg) 2272 { 2273 struct bridge_softc *sc = arg; 2274 2275 workqueue_enqueue(sc->sc_rtage_wq, &bridge_rtage_wk, NULL); 2276 } 2277 2278 static void 2279 bridge_rtage_work(struct work *wk, void *arg) 2280 { 2281 struct bridge_softc *sc = arg; 2282 2283 KASSERT(wk == &bridge_rtage_wk); 2284 2285 bridge_rtage(sc); 2286 2287 if (sc->sc_if.if_flags & IFF_RUNNING) 2288 callout_reset(&sc->sc_brcallout, 2289 bridge_rtable_prune_period * hz, bridge_timer, sc); 2290 } 2291 2292 static bool 2293 bridge_rtage_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2294 bool *need_break, void *arg) 2295 { 2296 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2297 time_uptime >= brt->brt_expire) 2298 return true; 2299 else 2300 return false; 2301 } 2302 2303 /* 2304 * bridge_rtage: 2305 * 2306 * Perform an aging cycle. 2307 */ 2308 static void 2309 bridge_rtage(struct bridge_softc *sc) 2310 { 2311 bridge_rtlist_iterate_remove(sc, bridge_rtage_cb, NULL); 2312 } 2313 2314 2315 static bool 2316 bridge_rtflush_cb(struct bridge_softc *sc, struct bridge_rtnode *brt, 2317 bool *need_break, void *arg) 2318 { 2319 int full = *(int*)arg; 2320 2321 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2322 return true; 2323 else 2324 return false; 2325 } 2326 2327 /* 2328 * bridge_rtflush: 2329 * 2330 * Remove all dynamic addresses from the bridge. 2331 */ 2332 static void 2333 bridge_rtflush(struct bridge_softc *sc, int full) 2334 { 2335 bridge_rtlist_iterate_remove(sc, bridge_rtflush_cb, &full); 2336 } 2337 2338 /* 2339 * bridge_rtdaddr: 2340 * 2341 * Remove an address from the table. 2342 */ 2343 static int 2344 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2345 { 2346 struct bridge_rtnode *brt; 2347 2348 BRIDGE_RT_LOCK(sc); 2349 BRIDGE_RT_INTR_LOCK(sc); 2350 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2351 BRIDGE_RT_INTR_UNLOCK(sc); 2352 BRIDGE_RT_UNLOCK(sc); 2353 return ENOENT; 2354 } 2355 bridge_rtnode_remove(sc, brt); 2356 BRIDGE_RT_INTR_UNLOCK(sc); 2357 BRIDGE_RT_PSZ_PERFORM(sc); 2358 BRIDGE_RT_UNLOCK(sc); 2359 2360 bridge_rtnode_destroy(brt); 2361 2362 return 0; 2363 } 2364 2365 /* 2366 * bridge_rtdelete: 2367 * 2368 * Delete routes to a speicifc member interface. 2369 */ 2370 static void 2371 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2372 { 2373 struct bridge_rtnode *brt, *nbrt; 2374 2375 BRIDGE_RT_LOCK(sc); 2376 BRIDGE_RT_INTR_LOCK(sc); 2377 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2378 if (brt->brt_ifp == ifp) 2379 break; 2380 } 2381 if (brt == NULL) { 2382 BRIDGE_RT_INTR_UNLOCK(sc); 2383 BRIDGE_RT_UNLOCK(sc); 2384 return; 2385 } 2386 bridge_rtnode_remove(sc, brt); 2387 BRIDGE_RT_INTR_UNLOCK(sc); 2388 BRIDGE_RT_PSZ_PERFORM(sc); 2389 BRIDGE_RT_UNLOCK(sc); 2390 2391 bridge_rtnode_destroy(brt); 2392 } 2393 2394 /* 2395 * bridge_rtable_init: 2396 * 2397 * Initialize the route table for this bridge. 2398 */ 2399 static void 2400 bridge_rtable_init(struct bridge_softc *sc) 2401 { 2402 int i; 2403 2404 sc->sc_rthash = kmem_alloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2405 KM_SLEEP); 2406 2407 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2408 LIST_INIT(&sc->sc_rthash[i]); 2409 2410 sc->sc_rthash_key = cprng_fast32(); 2411 2412 LIST_INIT(&sc->sc_rtlist); 2413 2414 sc->sc_rtlist_intr_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NET); 2415 #ifdef BRIDGE_MPSAFE 2416 sc->sc_rtlist_psz = pserialize_create(); 2417 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_SOFTNET); 2418 #else 2419 sc->sc_rtlist_psz = NULL; 2420 sc->sc_rtlist_lock = NULL; 2421 #endif 2422 } 2423 2424 /* 2425 * bridge_rtable_fini: 2426 * 2427 * Deconstruct the route table for this bridge. 2428 */ 2429 static void 2430 bridge_rtable_fini(struct bridge_softc *sc) 2431 { 2432 2433 kmem_free(sc->sc_rthash, sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE); 2434 if (sc->sc_rtlist_intr_lock) 2435 mutex_obj_free(sc->sc_rtlist_intr_lock); 2436 if (sc->sc_rtlist_lock) 2437 mutex_obj_free(sc->sc_rtlist_lock); 2438 if (sc->sc_rtlist_psz) 2439 pserialize_destroy(sc->sc_rtlist_psz); 2440 } 2441 2442 /* 2443 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2444 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2445 */ 2446 #define mix(a, b, c) \ 2447 do { \ 2448 a -= b; a -= c; a ^= (c >> 13); \ 2449 b -= c; b -= a; b ^= (a << 8); \ 2450 c -= a; c -= b; c ^= (b >> 13); \ 2451 a -= b; a -= c; a ^= (c >> 12); \ 2452 b -= c; b -= a; b ^= (a << 16); \ 2453 c -= a; c -= b; c ^= (b >> 5); \ 2454 a -= b; a -= c; a ^= (c >> 3); \ 2455 b -= c; b -= a; b ^= (a << 10); \ 2456 c -= a; c -= b; c ^= (b >> 15); \ 2457 } while (/*CONSTCOND*/0) 2458 2459 static inline uint32_t 2460 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2461 { 2462 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2463 2464 b += addr[5] << 8; 2465 b += addr[4]; 2466 a += addr[3] << 24; 2467 a += addr[2] << 16; 2468 a += addr[1] << 8; 2469 a += addr[0]; 2470 2471 mix(a, b, c); 2472 2473 return (c & BRIDGE_RTHASH_MASK); 2474 } 2475 2476 #undef mix 2477 2478 /* 2479 * bridge_rtnode_lookup: 2480 * 2481 * Look up a bridge route node for the specified destination. 2482 */ 2483 static struct bridge_rtnode * 2484 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2485 { 2486 struct bridge_rtnode *brt; 2487 uint32_t hash; 2488 int dir; 2489 2490 hash = bridge_rthash(sc, addr); 2491 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2492 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2493 if (dir == 0) 2494 return (brt); 2495 if (dir > 0) 2496 return (NULL); 2497 } 2498 2499 return (NULL); 2500 } 2501 2502 /* 2503 * bridge_rtnode_insert: 2504 * 2505 * Insert the specified bridge node into the route table. We 2506 * assume the entry is not already in the table. 2507 */ 2508 static int 2509 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2510 { 2511 struct bridge_rtnode *lbrt; 2512 uint32_t hash; 2513 int dir; 2514 2515 KASSERT(BRIDGE_RT_INTR_LOCKED(sc)); 2516 2517 hash = bridge_rthash(sc, brt->brt_addr); 2518 2519 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2520 if (lbrt == NULL) { 2521 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2522 goto out; 2523 } 2524 2525 do { 2526 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2527 if (dir == 0) 2528 return (EEXIST); 2529 if (dir > 0) { 2530 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2531 goto out; 2532 } 2533 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2534 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2535 goto out; 2536 } 2537 lbrt = LIST_NEXT(lbrt, brt_hash); 2538 } while (lbrt != NULL); 2539 2540 #ifdef DIAGNOSTIC 2541 panic("bridge_rtnode_insert: impossible"); 2542 #endif 2543 2544 out: 2545 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2546 sc->sc_brtcnt++; 2547 2548 return (0); 2549 } 2550 2551 /* 2552 * bridge_rtnode_remove: 2553 * 2554 * Remove a bridge rtnode from the rthash and the rtlist of a bridge. 2555 */ 2556 static void 2557 bridge_rtnode_remove(struct bridge_softc *sc, struct bridge_rtnode *brt) 2558 { 2559 2560 KASSERT(BRIDGE_RT_INTR_LOCKED(sc)); 2561 2562 LIST_REMOVE(brt, brt_hash); 2563 LIST_REMOVE(brt, brt_list); 2564 sc->sc_brtcnt--; 2565 } 2566 2567 /* 2568 * bridge_rtnode_destroy: 2569 * 2570 * Destroy a bridge rtnode. 2571 */ 2572 static void 2573 bridge_rtnode_destroy(struct bridge_rtnode *brt) 2574 { 2575 2576 pool_put(&bridge_rtnode_pool, brt); 2577 } 2578 2579 #if defined(BRIDGE_IPF) 2580 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2581 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2582 2583 /* 2584 * Send bridge packets through IPF if they are one of the types IPF can deal 2585 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2586 * question.) 2587 */ 2588 static int 2589 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2590 { 2591 int snap, error; 2592 struct ether_header *eh1, eh2; 2593 struct llc llc1; 2594 uint16_t ether_type; 2595 2596 snap = 0; 2597 error = -1; /* Default error if not error == 0 */ 2598 eh1 = mtod(*mp, struct ether_header *); 2599 ether_type = ntohs(eh1->ether_type); 2600 2601 /* 2602 * Check for SNAP/LLC. 2603 */ 2604 if (ether_type < ETHERMTU) { 2605 struct llc *llc2 = (struct llc *)(eh1 + 1); 2606 2607 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2608 llc2->llc_dsap == LLC_SNAP_LSAP && 2609 llc2->llc_ssap == LLC_SNAP_LSAP && 2610 llc2->llc_control == LLC_UI) { 2611 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2612 snap = 1; 2613 } 2614 } 2615 2616 /* 2617 * If we're trying to filter bridge traffic, don't look at anything 2618 * other than IP and ARP traffic. If the filter doesn't understand 2619 * IPv6, don't allow IPv6 through the bridge either. This is lame 2620 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2621 * but of course we don't have an AppleTalk filter to begin with. 2622 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2623 * ARP traffic.) 2624 */ 2625 switch (ether_type) { 2626 case ETHERTYPE_ARP: 2627 case ETHERTYPE_REVARP: 2628 return 0; /* Automatically pass */ 2629 case ETHERTYPE_IP: 2630 # ifdef INET6 2631 case ETHERTYPE_IPV6: 2632 # endif /* INET6 */ 2633 break; 2634 default: 2635 goto bad; 2636 } 2637 2638 /* Strip off the Ethernet header and keep a copy. */ 2639 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2640 m_adj(*mp, ETHER_HDR_LEN); 2641 2642 /* Strip off snap header, if present */ 2643 if (snap) { 2644 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2645 m_adj(*mp, sizeof(struct llc)); 2646 } 2647 2648 /* 2649 * Check basic packet sanity and run IPF through pfil. 2650 */ 2651 KASSERT(!cpu_intr_p()); 2652 switch (ether_type) 2653 { 2654 case ETHERTYPE_IP : 2655 error = (dir == PFIL_IN) ? bridge_ip_checkbasic(mp) : 0; 2656 if (error == 0) 2657 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2658 break; 2659 # ifdef INET6 2660 case ETHERTYPE_IPV6 : 2661 error = (dir == PFIL_IN) ? bridge_ip6_checkbasic(mp) : 0; 2662 if (error == 0) 2663 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2664 break; 2665 # endif 2666 default : 2667 error = 0; 2668 break; 2669 } 2670 2671 if (*mp == NULL) 2672 return error; 2673 if (error != 0) 2674 goto bad; 2675 2676 error = -1; 2677 2678 /* 2679 * Finally, put everything back the way it was and return 2680 */ 2681 if (snap) { 2682 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2683 if (*mp == NULL) 2684 return error; 2685 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2686 } 2687 2688 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2689 if (*mp == NULL) 2690 return error; 2691 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2692 2693 return 0; 2694 2695 bad: 2696 m_freem(*mp); 2697 *mp = NULL; 2698 return error; 2699 } 2700 2701 /* 2702 * Perform basic checks on header size since 2703 * IPF assumes ip_input has already processed 2704 * it for it. Cut-and-pasted from ip_input.c. 2705 * Given how simple the IPv6 version is, 2706 * does the IPv4 version really need to be 2707 * this complicated? 2708 * 2709 * XXX Should we update ipstat here, or not? 2710 * XXX Right now we update ipstat but not 2711 * XXX csum_counter. 2712 */ 2713 static int 2714 bridge_ip_checkbasic(struct mbuf **mp) 2715 { 2716 struct mbuf *m = *mp; 2717 struct ip *ip; 2718 int len, hlen; 2719 2720 if (*mp == NULL) 2721 return -1; 2722 2723 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2724 if ((m = m_copyup(m, sizeof(struct ip), 2725 (max_linkhdr + 3) & ~3)) == NULL) { 2726 /* XXXJRT new stat, please */ 2727 ip_statinc(IP_STAT_TOOSMALL); 2728 goto bad; 2729 } 2730 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2731 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2732 ip_statinc(IP_STAT_TOOSMALL); 2733 goto bad; 2734 } 2735 } 2736 ip = mtod(m, struct ip *); 2737 if (ip == NULL) goto bad; 2738 2739 if (ip->ip_v != IPVERSION) { 2740 ip_statinc(IP_STAT_BADVERS); 2741 goto bad; 2742 } 2743 hlen = ip->ip_hl << 2; 2744 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2745 ip_statinc(IP_STAT_BADHLEN); 2746 goto bad; 2747 } 2748 if (hlen > m->m_len) { 2749 if ((m = m_pullup(m, hlen)) == 0) { 2750 ip_statinc(IP_STAT_BADHLEN); 2751 goto bad; 2752 } 2753 ip = mtod(m, struct ip *); 2754 if (ip == NULL) goto bad; 2755 } 2756 2757 switch (m->m_pkthdr.csum_flags & 2758 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 2759 M_CSUM_IPv4_BAD)) { 2760 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2761 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2762 goto bad; 2763 2764 case M_CSUM_IPv4: 2765 /* Checksum was okay. */ 2766 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2767 break; 2768 2769 default: 2770 /* Must compute it ourselves. */ 2771 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2772 if (in_cksum(m, hlen) != 0) 2773 goto bad; 2774 break; 2775 } 2776 2777 /* Retrieve the packet length. */ 2778 len = ntohs(ip->ip_len); 2779 2780 /* 2781 * Check for additional length bogosity 2782 */ 2783 if (len < hlen) { 2784 ip_statinc(IP_STAT_BADLEN); 2785 goto bad; 2786 } 2787 2788 /* 2789 * Check that the amount of data in the buffers 2790 * is as at least much as the IP header would have us expect. 2791 * Drop packet if shorter than we expect. 2792 */ 2793 if (m->m_pkthdr.len < len) { 2794 ip_statinc(IP_STAT_TOOSHORT); 2795 goto bad; 2796 } 2797 2798 /* Checks out, proceed */ 2799 *mp = m; 2800 return 0; 2801 2802 bad: 2803 *mp = m; 2804 return -1; 2805 } 2806 2807 # ifdef INET6 2808 /* 2809 * Same as above, but for IPv6. 2810 * Cut-and-pasted from ip6_input.c. 2811 * XXX Should we update ip6stat, or not? 2812 */ 2813 static int 2814 bridge_ip6_checkbasic(struct mbuf **mp) 2815 { 2816 struct mbuf *m = *mp; 2817 struct ip6_hdr *ip6; 2818 2819 /* 2820 * If the IPv6 header is not aligned, slurp it up into a new 2821 * mbuf with space for link headers, in the event we forward 2822 * it. Otherwise, if it is aligned, make sure the entire base 2823 * IPv6 header is in the first mbuf of the chain. 2824 */ 2825 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2826 struct ifnet *inifp = m->m_pkthdr.rcvif; 2827 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2828 (max_linkhdr + 3) & ~3)) == NULL) { 2829 /* XXXJRT new stat, please */ 2830 ip6_statinc(IP6_STAT_TOOSMALL); 2831 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2832 goto bad; 2833 } 2834 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2835 struct ifnet *inifp = m->m_pkthdr.rcvif; 2836 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2837 ip6_statinc(IP6_STAT_TOOSMALL); 2838 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2839 goto bad; 2840 } 2841 } 2842 2843 ip6 = mtod(m, struct ip6_hdr *); 2844 2845 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2846 ip6_statinc(IP6_STAT_BADVERS); 2847 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 2848 goto bad; 2849 } 2850 2851 /* Checks out, proceed */ 2852 *mp = m; 2853 return 0; 2854 2855 bad: 2856 *mp = m; 2857 return -1; 2858 } 2859 # endif /* INET6 */ 2860 #endif /* BRIDGE_IPF */ 2861
Indexes created Thu Oct 02 14:10:14 GMT 2025