if_bridge.c revision 1.88
1 /* $NetBSD: if_bridge.c,v 1.88 2014/07/20 16:40:34 ozaki-r Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (c) 1999, 2000 Jason L. Wright (jason (at) thought.net) 40 * All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by Jason L. Wright 53 * 4. The name of the author may not be used to endorse or promote products 54 * derived from this software without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 57 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 58 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 59 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 60 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 61 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 62 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 64 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 65 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 66 * POSSIBILITY OF SUCH DAMAGE. 67 * 68 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 69 */ 70 71 /* 72 * Network interface bridge support. 73 * 74 * TODO: 75 * 76 * - Currently only supports Ethernet-like interfaces (Ethernet, 77 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 78 * to bridge other types of interfaces (FDDI-FDDI, and maybe 79 * consider heterogenous bridges). 80 */ 81 82 #include <sys/cdefs.h> 83 __KERNEL_RCSID(0, "$NetBSD: if_bridge.c,v 1.88 2014/07/20 16:40:34 ozaki-r 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> 104 105 #include <net/bpf.h> 106 #include <net/if.h> 107 #include <net/if_dl.h> 108 #include <net/if_types.h> 109 #include <net/if_llc.h> 110 #include <net/pktqueue.h> 111 112 #include <net/if_ether.h> 113 #include <net/if_bridgevar.h> 114 115 #if defined(BRIDGE_IPF) 116 /* Used for bridge_ip[6]_checkbasic */ 117 #include <netinet/in.h> 118 #include <netinet/in_systm.h> 119 #include <netinet/ip.h> 120 #include <netinet/ip_var.h> 121 #include <netinet/ip_private.h> /* XXX */ 122 123 #include <netinet/ip6.h> 124 #include <netinet6/in6_var.h> 125 #include <netinet6/ip6_var.h> 126 #include <netinet6/ip6_private.h> /* XXX */ 127 #endif /* BRIDGE_IPF */ 128 129 /* 130 * Size of the route hash table. Must be a power of two. 131 */ 132 #ifndef BRIDGE_RTHASH_SIZE 133 #define BRIDGE_RTHASH_SIZE 1024 134 #endif 135 136 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 137 138 #include "carp.h" 139 #if NCARP > 0 140 #include <netinet/in.h> 141 #include <netinet/in_var.h> 142 #include <netinet/ip_carp.h> 143 #endif 144 145 /* 146 * Maximum number of addresses to cache. 147 */ 148 #ifndef BRIDGE_RTABLE_MAX 149 #define BRIDGE_RTABLE_MAX 100 150 #endif 151 152 /* 153 * Spanning tree defaults. 154 */ 155 #define BSTP_DEFAULT_MAX_AGE (20 * 256) 156 #define BSTP_DEFAULT_HELLO_TIME (2 * 256) 157 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) 158 #define BSTP_DEFAULT_HOLD_TIME (1 * 256) 159 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 160 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 161 #define BSTP_DEFAULT_PATH_COST 55 162 163 /* 164 * Timeout (in seconds) for entries learned dynamically. 165 */ 166 #ifndef BRIDGE_RTABLE_TIMEOUT 167 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 168 #endif 169 170 /* 171 * Number of seconds between walks of the route list. 172 */ 173 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 174 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 175 #endif 176 177 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 178 179 static struct pool bridge_rtnode_pool; 180 181 void bridgeattach(int); 182 183 static int bridge_clone_create(struct if_clone *, int); 184 static int bridge_clone_destroy(struct ifnet *); 185 186 static int bridge_ioctl(struct ifnet *, u_long, void *); 187 static int bridge_init(struct ifnet *); 188 static void bridge_stop(struct ifnet *, int); 189 static void bridge_start(struct ifnet *); 190 191 static void bridge_input(struct ifnet *, struct mbuf *); 192 static void bridge_forward(void *); 193 194 static void bridge_timer(void *); 195 196 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 197 struct mbuf *); 198 199 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 200 struct ifnet *, int, uint8_t); 201 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 202 static void bridge_rttrim(struct bridge_softc *); 203 static void bridge_rtage(struct bridge_softc *); 204 static void bridge_rtflush(struct bridge_softc *, int); 205 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 206 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp); 207 208 static int bridge_rtable_init(struct bridge_softc *); 209 static void bridge_rtable_fini(struct bridge_softc *); 210 211 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 212 const uint8_t *); 213 static int bridge_rtnode_insert(struct bridge_softc *, 214 struct bridge_rtnode *); 215 static void bridge_rtnode_destroy(struct bridge_softc *, 216 struct bridge_rtnode *); 217 218 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 219 const char *name); 220 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 221 struct ifnet *ifp); 222 static void bridge_release_member(struct bridge_softc *, struct bridge_iflist *); 223 static void bridge_delete_member(struct bridge_softc *, 224 struct bridge_iflist *); 225 226 static int bridge_ioctl_add(struct bridge_softc *, void *); 227 static int bridge_ioctl_del(struct bridge_softc *, void *); 228 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 229 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 230 static int bridge_ioctl_scache(struct bridge_softc *, void *); 231 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 232 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 233 static int bridge_ioctl_rts(struct bridge_softc *, void *); 234 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 235 static int bridge_ioctl_sto(struct bridge_softc *, void *); 236 static int bridge_ioctl_gto(struct bridge_softc *, void *); 237 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 238 static int bridge_ioctl_flush(struct bridge_softc *, void *); 239 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 240 static int bridge_ioctl_spri(struct bridge_softc *, void *); 241 static int bridge_ioctl_ght(struct bridge_softc *, void *); 242 static int bridge_ioctl_sht(struct bridge_softc *, void *); 243 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 244 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 245 static int bridge_ioctl_gma(struct bridge_softc *, void *); 246 static int bridge_ioctl_sma(struct bridge_softc *, void *); 247 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 248 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 249 #if defined(BRIDGE_IPF) 250 static int bridge_ioctl_gfilt(struct bridge_softc *, void *); 251 static int bridge_ioctl_sfilt(struct bridge_softc *, void *); 252 static int bridge_ipf(void *, struct mbuf **, struct ifnet *, int); 253 static int bridge_ip_checkbasic(struct mbuf **mp); 254 # ifdef INET6 255 static int bridge_ip6_checkbasic(struct mbuf **mp); 256 # endif /* INET6 */ 257 #endif /* BRIDGE_IPF */ 258 259 static void bridge_sysctl_fwdq_setup(struct sysctllog **clog, 260 struct bridge_softc *sc); 261 262 struct bridge_control { 263 int (*bc_func)(struct bridge_softc *, void *); 264 int bc_argsize; 265 int bc_flags; 266 }; 267 268 #define BC_F_COPYIN 0x01 /* copy arguments in */ 269 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 270 #define BC_F_SUSER 0x04 /* do super-user check */ 271 272 static const struct bridge_control bridge_control_table[] = { 273 [BRDGADD] = {bridge_ioctl_add, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 274 [BRDGDEL] = {bridge_ioctl_del, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 275 276 [BRDGGIFFLGS] = {bridge_ioctl_gifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_COPYOUT}, 277 [BRDGSIFFLGS] = {bridge_ioctl_sifflags, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 278 279 [BRDGSCACHE] = {bridge_ioctl_scache, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 280 [BRDGGCACHE] = {bridge_ioctl_gcache, sizeof(struct ifbrparam), BC_F_COPYOUT}, 281 282 [BRDGGIFS] = {bridge_ioctl_gifs, sizeof(struct ifbifconf), BC_F_COPYIN|BC_F_COPYOUT}, 283 [BRDGRTS] = {bridge_ioctl_rts, sizeof(struct ifbaconf), BC_F_COPYIN|BC_F_COPYOUT}, 284 285 [BRDGSADDR] = {bridge_ioctl_saddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 286 287 [BRDGSTO] = {bridge_ioctl_sto, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 288 [BRDGGTO] = {bridge_ioctl_gto, sizeof(struct ifbrparam), BC_F_COPYOUT}, 289 290 [BRDGDADDR] = {bridge_ioctl_daddr, sizeof(struct ifbareq), BC_F_COPYIN|BC_F_SUSER}, 291 292 [BRDGFLUSH] = {bridge_ioctl_flush, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 293 294 [BRDGGPRI] = {bridge_ioctl_gpri, sizeof(struct ifbrparam), BC_F_COPYOUT}, 295 [BRDGSPRI] = {bridge_ioctl_spri, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 296 297 [BRDGGHT] = {bridge_ioctl_ght, sizeof(struct ifbrparam), BC_F_COPYOUT}, 298 [BRDGSHT] = {bridge_ioctl_sht, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 299 300 [BRDGGFD] = {bridge_ioctl_gfd, sizeof(struct ifbrparam), BC_F_COPYOUT}, 301 [BRDGSFD] = {bridge_ioctl_sfd, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 302 303 [BRDGGMA] = {bridge_ioctl_gma, sizeof(struct ifbrparam), BC_F_COPYOUT}, 304 [BRDGSMA] = {bridge_ioctl_sma, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 305 306 [BRDGSIFPRIO] = {bridge_ioctl_sifprio, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 307 308 [BRDGSIFCOST] = {bridge_ioctl_sifcost, sizeof(struct ifbreq), BC_F_COPYIN|BC_F_SUSER}, 309 #if defined(BRIDGE_IPF) 310 [BRDGGFILT] = {bridge_ioctl_gfilt, sizeof(struct ifbrparam), BC_F_COPYOUT}, 311 [BRDGSFILT] = {bridge_ioctl_sfilt, sizeof(struct ifbrparam), BC_F_COPYIN|BC_F_SUSER}, 312 #endif /* BRIDGE_IPF */ 313 }; 314 static const int bridge_control_table_size = __arraycount(bridge_control_table); 315 316 static LIST_HEAD(, bridge_softc) bridge_list; 317 static kmutex_t bridge_list_lock; 318 319 static struct if_clone bridge_cloner = 320 IF_CLONE_INITIALIZER("bridge", bridge_clone_create, bridge_clone_destroy); 321 322 /* 323 * bridgeattach: 324 * 325 * Pseudo-device attach routine. 326 */ 327 void 328 bridgeattach(int n) 329 { 330 331 pool_init(&bridge_rtnode_pool, sizeof(struct bridge_rtnode), 332 0, 0, 0, "brtpl", NULL, IPL_NET); 333 334 LIST_INIT(&bridge_list); 335 mutex_init(&bridge_list_lock, MUTEX_DEFAULT, IPL_NET); 336 if_clone_attach(&bridge_cloner); 337 } 338 339 /* 340 * bridge_clone_create: 341 * 342 * Create a new bridge instance. 343 */ 344 static int 345 bridge_clone_create(struct if_clone *ifc, int unit) 346 { 347 struct bridge_softc *sc; 348 struct ifnet *ifp; 349 350 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 351 ifp = &sc->sc_if; 352 353 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 354 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 355 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 356 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 357 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 358 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 359 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 360 sc->sc_filter_flags = 0; 361 362 /* Initialize our routing table. */ 363 bridge_rtable_init(sc); 364 365 callout_init(&sc->sc_brcallout, 0); 366 callout_init(&sc->sc_bstpcallout, 0); 367 368 LIST_INIT(&sc->sc_iflist); 369 #ifdef BRIDGE_MPSAFE 370 sc->sc_iflist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NET); 371 #else 372 sc->sc_iflist_lock = NULL; 373 #endif 374 cv_init(&sc->sc_iflist_cv, "if_bridge_cv"); 375 376 if_initname(ifp, ifc->ifc_name, unit); 377 ifp->if_softc = sc; 378 ifp->if_mtu = ETHERMTU; 379 ifp->if_ioctl = bridge_ioctl; 380 ifp->if_output = bridge_output; 381 ifp->if_start = bridge_start; 382 ifp->if_stop = bridge_stop; 383 ifp->if_init = bridge_init; 384 ifp->if_type = IFT_BRIDGE; 385 ifp->if_addrlen = 0; 386 ifp->if_dlt = DLT_EN10MB; 387 ifp->if_hdrlen = ETHER_HDR_LEN; 388 389 sc->sc_fwd_pktq = pktq_create(IFQ_MAXLEN, bridge_forward, sc); 390 KASSERT(sc->sc_fwd_pktq != NULL); 391 392 bridge_sysctl_fwdq_setup(&ifp->if_sysctl_log, sc); 393 394 if_attach(ifp); 395 396 if_alloc_sadl(ifp); 397 398 mutex_enter(&bridge_list_lock); 399 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 400 mutex_exit(&bridge_list_lock); 401 402 return (0); 403 } 404 405 /* 406 * bridge_clone_destroy: 407 * 408 * Destroy a bridge instance. 409 */ 410 static int 411 bridge_clone_destroy(struct ifnet *ifp) 412 { 413 struct bridge_softc *sc = ifp->if_softc; 414 struct bridge_iflist *bif; 415 int s; 416 417 /* Must be called during IFF_RUNNING, i.e., before bridge_stop */ 418 pktq_barrier(sc->sc_fwd_pktq); 419 420 s = splnet(); 421 422 bridge_stop(ifp, 1); 423 424 BRIDGE_LOCK(sc); 425 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 426 bridge_delete_member(sc, bif); 427 BRIDGE_UNLOCK(sc); 428 429 mutex_enter(&bridge_list_lock); 430 LIST_REMOVE(sc, sc_list); 431 mutex_exit(&bridge_list_lock); 432 433 splx(s); 434 435 if_detach(ifp); 436 437 /* Should be called after if_detach for safe */ 438 pktq_flush(sc->sc_fwd_pktq); 439 pktq_destroy(sc->sc_fwd_pktq); 440 441 /* Tear down the routing table. */ 442 bridge_rtable_fini(sc); 443 444 cv_destroy(&sc->sc_iflist_cv); 445 if (sc->sc_iflist_lock) 446 mutex_obj_free(sc->sc_iflist_lock); 447 448 free(sc, M_DEVBUF); 449 450 return (0); 451 } 452 453 static int 454 bridge_sysctl_fwdq_maxlen(SYSCTLFN_ARGS) 455 { 456 struct sysctlnode node = *rnode; 457 const struct bridge_softc *sc = node.sysctl_data; 458 return sysctl_pktq_maxlen(SYSCTLFN_CALL(rnode), sc->sc_fwd_pktq); 459 } 460 461 #define SYSCTL_BRIDGE_PKTQ(cn, c) \ 462 static int \ 463 bridge_sysctl_fwdq_##cn(SYSCTLFN_ARGS) \ 464 { \ 465 struct sysctlnode node = *rnode; \ 466 const struct bridge_softc *sc = node.sysctl_data; \ 467 return sysctl_pktq_count(SYSCTLFN_CALL(rnode), \ 468 sc->sc_fwd_pktq, c); \ 469 } 470 471 SYSCTL_BRIDGE_PKTQ(items, PKTQ_NITEMS) 472 SYSCTL_BRIDGE_PKTQ(drops, PKTQ_DROPS) 473 474 static void 475 bridge_sysctl_fwdq_setup(struct sysctllog **clog, struct bridge_softc *sc) 476 { 477 const struct sysctlnode *cnode, *rnode; 478 sysctlfn len_func = NULL, maxlen_func = NULL, drops_func = NULL; 479 const char *ifname = sc->sc_if.if_xname; 480 481 len_func = bridge_sysctl_fwdq_items; 482 maxlen_func = bridge_sysctl_fwdq_maxlen; 483 drops_func = bridge_sysctl_fwdq_drops; 484 485 if (sysctl_createv(clog, 0, NULL, &rnode, 486 CTLFLAG_PERMANENT, 487 CTLTYPE_NODE, "interfaces", 488 SYSCTL_DESCR("Per-interface controls"), 489 NULL, 0, NULL, 0, 490 CTL_NET, CTL_CREATE, CTL_EOL) != 0) 491 goto bad; 492 493 if (sysctl_createv(clog, 0, &rnode, &rnode, 494 CTLFLAG_PERMANENT, 495 CTLTYPE_NODE, ifname, 496 SYSCTL_DESCR("Interface controls"), 497 NULL, 0, NULL, 0, 498 CTL_CREATE, CTL_EOL) != 0) 499 goto bad; 500 501 if (sysctl_createv(clog, 0, &rnode, &rnode, 502 CTLFLAG_PERMANENT, 503 CTLTYPE_NODE, "fwdq", 504 SYSCTL_DESCR("Protocol input queue controls"), 505 NULL, 0, NULL, 0, 506 CTL_CREATE, CTL_EOL) != 0) 507 goto bad; 508 509 if (sysctl_createv(clog, 0, &rnode, &cnode, 510 CTLFLAG_PERMANENT, 511 CTLTYPE_INT, "len", 512 SYSCTL_DESCR("Current forwarding queue length"), 513 len_func, 0, (void *)sc, 0, 514 CTL_CREATE, IFQCTL_LEN, CTL_EOL) != 0) 515 goto bad; 516 517 if (sysctl_createv(clog, 0, &rnode, &cnode, 518 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 519 CTLTYPE_INT, "maxlen", 520 SYSCTL_DESCR("Maximum allowed forwarding queue length"), 521 maxlen_func, 0, (void *)sc, 0, 522 CTL_CREATE, IFQCTL_MAXLEN, CTL_EOL) != 0) 523 goto bad; 524 525 if (sysctl_createv(clog, 0, &rnode, &cnode, 526 CTLFLAG_PERMANENT, 527 CTLTYPE_INT, "drops", 528 SYSCTL_DESCR("Packets dropped due to full forwarding queue"), 529 drops_func, 0, (void *)sc, 0, 530 CTL_CREATE, IFQCTL_DROPS, CTL_EOL) != 0) 531 goto bad; 532 533 return; 534 bad: 535 aprint_error("%s: could not attach sysctl nodes\n", ifname); 536 return; 537 } 538 539 /* 540 * bridge_ioctl: 541 * 542 * Handle a control request from the operator. 543 */ 544 static int 545 bridge_ioctl(struct ifnet *ifp, u_long cmd, void *data) 546 { 547 struct bridge_softc *sc = ifp->if_softc; 548 struct lwp *l = curlwp; /* XXX */ 549 union { 550 struct ifbreq ifbreq; 551 struct ifbifconf ifbifconf; 552 struct ifbareq ifbareq; 553 struct ifbaconf ifbaconf; 554 struct ifbrparam ifbrparam; 555 } args; 556 struct ifdrv *ifd = (struct ifdrv *) data; 557 const struct bridge_control *bc = NULL; /* XXXGCC */ 558 int s, error = 0; 559 560 /* Authorize command before calling splnet(). */ 561 switch (cmd) { 562 case SIOCGDRVSPEC: 563 case SIOCSDRVSPEC: 564 if (ifd->ifd_cmd >= bridge_control_table_size) { 565 error = EINVAL; 566 return error; 567 } 568 569 bc = &bridge_control_table[ifd->ifd_cmd]; 570 571 /* We only care about BC_F_SUSER at this point. */ 572 if ((bc->bc_flags & BC_F_SUSER) == 0) 573 break; 574 575 error = kauth_authorize_network(l->l_cred, 576 KAUTH_NETWORK_INTERFACE_BRIDGE, 577 cmd == SIOCGDRVSPEC ? 578 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_GETPRIV : 579 KAUTH_REQ_NETWORK_INTERFACE_BRIDGE_SETPRIV, 580 ifd, NULL, NULL); 581 if (error) 582 return (error); 583 584 break; 585 } 586 587 s = splnet(); 588 589 switch (cmd) { 590 case SIOCGDRVSPEC: 591 case SIOCSDRVSPEC: 592 KASSERT(bc != NULL); 593 if (cmd == SIOCGDRVSPEC && 594 (bc->bc_flags & BC_F_COPYOUT) == 0) { 595 error = EINVAL; 596 break; 597 } 598 else if (cmd == SIOCSDRVSPEC && 599 (bc->bc_flags & BC_F_COPYOUT) != 0) { 600 error = EINVAL; 601 break; 602 } 603 604 /* BC_F_SUSER is checked above, before splnet(). */ 605 606 if (ifd->ifd_len != bc->bc_argsize || 607 ifd->ifd_len > sizeof(args)) { 608 error = EINVAL; 609 break; 610 } 611 612 memset(&args, 0, sizeof(args)); 613 if (bc->bc_flags & BC_F_COPYIN) { 614 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 615 if (error) 616 break; 617 } 618 619 error = (*bc->bc_func)(sc, &args); 620 if (error) 621 break; 622 623 if (bc->bc_flags & BC_F_COPYOUT) 624 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 625 626 break; 627 628 case SIOCSIFFLAGS: 629 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 630 break; 631 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) { 632 case IFF_RUNNING: 633 /* 634 * If interface is marked down and it is running, 635 * then stop and disable it. 636 */ 637 (*ifp->if_stop)(ifp, 1); 638 break; 639 case IFF_UP: 640 /* 641 * If interface is marked up and it is stopped, then 642 * start it. 643 */ 644 error = (*ifp->if_init)(ifp); 645 break; 646 default: 647 break; 648 } 649 break; 650 651 case SIOCSIFMTU: 652 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 653 error = 0; 654 break; 655 656 default: 657 error = ifioctl_common(ifp, cmd, data); 658 break; 659 } 660 661 splx(s); 662 663 return (error); 664 } 665 666 /* 667 * bridge_lookup_member: 668 * 669 * Lookup a bridge member interface. 670 */ 671 static struct bridge_iflist * 672 bridge_lookup_member(struct bridge_softc *sc, const char *name) 673 { 674 struct bridge_iflist *bif; 675 struct ifnet *ifp; 676 677 BRIDGE_LOCK(sc); 678 679 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 680 ifp = bif->bif_ifp; 681 if (strcmp(ifp->if_xname, name) == 0) 682 break; 683 } 684 685 #ifdef BRIDGE_MPSAFE 686 if (bif != NULL) { 687 if (bif->bif_waiting) 688 bif = NULL; 689 else 690 atomic_inc_32(&bif->bif_refs); 691 } 692 #endif 693 694 BRIDGE_UNLOCK(sc); 695 696 return bif; 697 } 698 699 /* 700 * bridge_lookup_member_if: 701 * 702 * Lookup a bridge member interface by ifnet*. 703 */ 704 static struct bridge_iflist * 705 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 706 { 707 struct bridge_iflist *bif; 708 709 BRIDGE_LOCK(sc); 710 711 bif = member_ifp->if_bridgeif; 712 713 #ifdef BRIDGE_MPSAFE 714 if (bif != NULL) { 715 if (bif->bif_waiting) 716 bif = NULL; 717 else 718 atomic_inc_32(&bif->bif_refs); 719 } 720 #endif 721 722 BRIDGE_UNLOCK(sc); 723 724 return bif; 725 } 726 727 /* 728 * bridge_release_member: 729 * 730 * Release the specified member interface. 731 */ 732 static void 733 bridge_release_member(struct bridge_softc *sc, struct bridge_iflist *bif) 734 { 735 #ifdef BRIDGE_MPSAFE 736 atomic_dec_32(&bif->bif_refs); 737 membar_sync(); 738 if (__predict_false(bif->bif_waiting && bif->bif_refs == 0)) { 739 BRIDGE_LOCK(sc); 740 cv_broadcast(&sc->sc_iflist_cv); 741 BRIDGE_UNLOCK(sc); 742 } 743 #else 744 (void)sc; 745 (void)bif; 746 #endif 747 } 748 749 /* 750 * bridge_delete_member: 751 * 752 * Delete the specified member interface. 753 */ 754 static void 755 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif) 756 { 757 struct ifnet *ifs = bif->bif_ifp; 758 759 KASSERT(BRIDGE_LOCKED(sc)); 760 761 ifs->if_input = ether_input; 762 ifs->if_bridge = NULL; 763 ifs->if_bridgeif = NULL; 764 765 LIST_REMOVE(bif, bif_next); 766 767 #ifdef BRIDGE_MPSAFE 768 bif->bif_waiting = true; 769 membar_sync(); 770 while (bif->bif_refs > 0) { 771 aprint_debug("%s: cv_wait on iflist\n", __func__); 772 cv_wait(&sc->sc_iflist_cv, sc->sc_iflist_lock); 773 } 774 #endif 775 776 free(bif, M_DEVBUF); 777 } 778 779 static int 780 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 781 { 782 struct ifbreq *req = arg; 783 struct bridge_iflist *bif = NULL; 784 struct ifnet *ifs; 785 int error = 0; 786 787 ifs = ifunit(req->ifbr_ifsname); 788 if (ifs == NULL) 789 return (ENOENT); 790 791 if (sc->sc_if.if_mtu != ifs->if_mtu) 792 return (EINVAL); 793 794 if (ifs->if_bridge == sc) 795 return (EEXIST); 796 797 if (ifs->if_bridge != NULL) 798 return (EBUSY); 799 800 if (ifs->if_input != ether_input) 801 return EINVAL; 802 803 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT); 804 if (bif == NULL) 805 return (ENOMEM); 806 807 switch (ifs->if_type) { 808 case IFT_ETHER: 809 /* 810 * Place the interface into promiscuous mode. 811 */ 812 error = ifpromisc(ifs, 1); 813 if (error) 814 goto out; 815 break; 816 default: 817 error = EINVAL; 818 goto out; 819 } 820 821 bif->bif_ifp = ifs; 822 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 823 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 824 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 825 bif->bif_refs = 0; 826 bif->bif_waiting = false; 827 828 BRIDGE_LOCK(sc); 829 830 ifs->if_bridge = sc; 831 ifs->if_bridgeif = bif; 832 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 833 ifs->if_input = bridge_input; 834 835 BRIDGE_UNLOCK(sc); 836 837 if (sc->sc_if.if_flags & IFF_RUNNING) 838 bstp_initialization(sc); 839 else 840 bstp_stop(sc); 841 842 out: 843 if (error) { 844 if (bif != NULL) 845 free(bif, M_DEVBUF); 846 } 847 return (error); 848 } 849 850 static int 851 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 852 { 853 struct ifbreq *req = arg; 854 const char *name = req->ifbr_ifsname; 855 struct bridge_iflist *bif; 856 struct ifnet *ifs; 857 858 BRIDGE_LOCK(sc); 859 860 /* 861 * Don't use bridge_lookup_member. We want to get a member 862 * with bif_refs == 0. 863 */ 864 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 865 ifs = bif->bif_ifp; 866 if (strcmp(ifs->if_xname, name) == 0) 867 break; 868 } 869 870 if (bif == NULL) { 871 BRIDGE_UNLOCK(sc); 872 return ENOENT; 873 } 874 875 bridge_delete_member(sc, bif); 876 877 BRIDGE_UNLOCK(sc); 878 879 switch (ifs->if_type) { 880 case IFT_ETHER: 881 /* 882 * Take the interface out of promiscuous mode. 883 * Don't call it with holding sc_iflist_lock. 884 */ 885 (void) ifpromisc(ifs, 0); 886 break; 887 default: 888 #ifdef DIAGNOSTIC 889 panic("bridge_delete_member: impossible"); 890 #endif 891 break; 892 } 893 894 bridge_rtdelete(sc, ifs); 895 896 if (sc->sc_if.if_flags & IFF_RUNNING) 897 bstp_initialization(sc); 898 899 return 0; 900 } 901 902 static int 903 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 904 { 905 struct ifbreq *req = arg; 906 struct bridge_iflist *bif; 907 908 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 909 if (bif == NULL) 910 return (ENOENT); 911 912 req->ifbr_ifsflags = bif->bif_flags; 913 req->ifbr_state = bif->bif_state; 914 req->ifbr_priority = bif->bif_priority; 915 req->ifbr_path_cost = bif->bif_path_cost; 916 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 917 918 bridge_release_member(sc, bif); 919 920 return (0); 921 } 922 923 static int 924 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 925 { 926 struct ifbreq *req = arg; 927 struct bridge_iflist *bif; 928 929 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 930 if (bif == NULL) 931 return (ENOENT); 932 933 if (req->ifbr_ifsflags & IFBIF_STP) { 934 switch (bif->bif_ifp->if_type) { 935 case IFT_ETHER: 936 /* These can do spanning tree. */ 937 break; 938 939 default: 940 /* Nothing else can. */ 941 bridge_release_member(sc, bif); 942 return (EINVAL); 943 } 944 } 945 946 bif->bif_flags = req->ifbr_ifsflags; 947 948 bridge_release_member(sc, bif); 949 950 if (sc->sc_if.if_flags & IFF_RUNNING) 951 bstp_initialization(sc); 952 953 return (0); 954 } 955 956 static int 957 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 958 { 959 struct ifbrparam *param = arg; 960 961 sc->sc_brtmax = param->ifbrp_csize; 962 bridge_rttrim(sc); 963 964 return (0); 965 } 966 967 static int 968 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 969 { 970 struct ifbrparam *param = arg; 971 972 param->ifbrp_csize = sc->sc_brtmax; 973 974 return (0); 975 } 976 977 static int 978 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 979 { 980 struct ifbifconf *bifc = arg; 981 struct bridge_iflist *bif; 982 struct ifbreq breq; 983 int count, len, error = 0; 984 985 BRIDGE_LOCK(sc); 986 987 count = 0; 988 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 989 count++; 990 991 if (bifc->ifbic_len == 0) { 992 bifc->ifbic_len = sizeof(breq) * count; 993 return (0); 994 } 995 996 count = 0; 997 len = bifc->ifbic_len; 998 memset(&breq, 0, sizeof breq); 999 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1000 if (len < sizeof(breq)) 1001 break; 1002 1003 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1004 sizeof(breq.ifbr_ifsname)); 1005 breq.ifbr_ifsflags = bif->bif_flags; 1006 breq.ifbr_state = bif->bif_state; 1007 breq.ifbr_priority = bif->bif_priority; 1008 breq.ifbr_path_cost = bif->bif_path_cost; 1009 breq.ifbr_portno = bif->bif_ifp->if_index & 0xff; 1010 error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq)); 1011 if (error) 1012 break; 1013 count++; 1014 len -= sizeof(breq); 1015 } 1016 1017 BRIDGE_UNLOCK(sc); 1018 1019 bifc->ifbic_len = sizeof(breq) * count; 1020 return (error); 1021 } 1022 1023 static int 1024 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1025 { 1026 struct ifbaconf *bac = arg; 1027 struct bridge_rtnode *brt; 1028 struct ifbareq bareq; 1029 int count = 0, error = 0, len; 1030 1031 if (bac->ifbac_len == 0) 1032 return (0); 1033 1034 mutex_enter(sc->sc_rtlist_lock); 1035 1036 len = bac->ifbac_len; 1037 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1038 if (len < sizeof(bareq)) 1039 goto out; 1040 memset(&bareq, 0, sizeof(bareq)); 1041 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1042 sizeof(bareq.ifba_ifsname)); 1043 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1044 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1045 bareq.ifba_expire = brt->brt_expire - time_uptime; 1046 } else 1047 bareq.ifba_expire = 0; 1048 bareq.ifba_flags = brt->brt_flags; 1049 1050 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1051 if (error) 1052 goto out; 1053 count++; 1054 len -= sizeof(bareq); 1055 } 1056 out: 1057 mutex_exit(sc->sc_rtlist_lock); 1058 1059 bac->ifbac_len = sizeof(bareq) * count; 1060 return (error); 1061 } 1062 1063 static int 1064 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1065 { 1066 struct ifbareq *req = arg; 1067 struct bridge_iflist *bif; 1068 int error; 1069 1070 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1071 if (bif == NULL) 1072 return (ENOENT); 1073 1074 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1075 req->ifba_flags); 1076 1077 bridge_release_member(sc, bif); 1078 1079 return (error); 1080 } 1081 1082 static int 1083 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1084 { 1085 struct ifbrparam *param = arg; 1086 1087 sc->sc_brttimeout = param->ifbrp_ctime; 1088 1089 return (0); 1090 } 1091 1092 static int 1093 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1094 { 1095 struct ifbrparam *param = arg; 1096 1097 param->ifbrp_ctime = sc->sc_brttimeout; 1098 1099 return (0); 1100 } 1101 1102 static int 1103 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1104 { 1105 struct ifbareq *req = arg; 1106 1107 return (bridge_rtdaddr(sc, req->ifba_dst)); 1108 } 1109 1110 static int 1111 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1112 { 1113 struct ifbreq *req = arg; 1114 1115 bridge_rtflush(sc, req->ifbr_ifsflags); 1116 1117 return (0); 1118 } 1119 1120 static int 1121 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1122 { 1123 struct ifbrparam *param = arg; 1124 1125 param->ifbrp_prio = sc->sc_bridge_priority; 1126 1127 return (0); 1128 } 1129 1130 static int 1131 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1132 { 1133 struct ifbrparam *param = arg; 1134 1135 sc->sc_bridge_priority = param->ifbrp_prio; 1136 1137 if (sc->sc_if.if_flags & IFF_RUNNING) 1138 bstp_initialization(sc); 1139 1140 return (0); 1141 } 1142 1143 static int 1144 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1145 { 1146 struct ifbrparam *param = arg; 1147 1148 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1149 1150 return (0); 1151 } 1152 1153 static int 1154 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1155 { 1156 struct ifbrparam *param = arg; 1157 1158 if (param->ifbrp_hellotime == 0) 1159 return (EINVAL); 1160 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1161 1162 if (sc->sc_if.if_flags & IFF_RUNNING) 1163 bstp_initialization(sc); 1164 1165 return (0); 1166 } 1167 1168 static int 1169 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1170 { 1171 struct ifbrparam *param = arg; 1172 1173 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1174 1175 return (0); 1176 } 1177 1178 static int 1179 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1180 { 1181 struct ifbrparam *param = arg; 1182 1183 if (param->ifbrp_fwddelay == 0) 1184 return (EINVAL); 1185 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1186 1187 if (sc->sc_if.if_flags & IFF_RUNNING) 1188 bstp_initialization(sc); 1189 1190 return (0); 1191 } 1192 1193 static int 1194 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1195 { 1196 struct ifbrparam *param = arg; 1197 1198 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1199 1200 return (0); 1201 } 1202 1203 static int 1204 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1205 { 1206 struct ifbrparam *param = arg; 1207 1208 if (param->ifbrp_maxage == 0) 1209 return (EINVAL); 1210 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1211 1212 if (sc->sc_if.if_flags & IFF_RUNNING) 1213 bstp_initialization(sc); 1214 1215 return (0); 1216 } 1217 1218 static int 1219 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1220 { 1221 struct ifbreq *req = arg; 1222 struct bridge_iflist *bif; 1223 1224 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1225 if (bif == NULL) 1226 return (ENOENT); 1227 1228 bif->bif_priority = req->ifbr_priority; 1229 1230 if (sc->sc_if.if_flags & IFF_RUNNING) 1231 bstp_initialization(sc); 1232 1233 bridge_release_member(sc, bif); 1234 1235 return (0); 1236 } 1237 1238 #if defined(BRIDGE_IPF) 1239 static int 1240 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1241 { 1242 struct ifbrparam *param = arg; 1243 1244 param->ifbrp_filter = sc->sc_filter_flags; 1245 1246 return (0); 1247 } 1248 1249 static int 1250 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1251 { 1252 struct ifbrparam *param = arg; 1253 uint32_t nflags, oflags; 1254 1255 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1256 return (EINVAL); 1257 1258 nflags = param->ifbrp_filter; 1259 oflags = sc->sc_filter_flags; 1260 1261 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1262 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1263 sc->sc_if.if_pfil); 1264 } 1265 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1266 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1267 sc->sc_if.if_pfil); 1268 } 1269 1270 sc->sc_filter_flags = nflags; 1271 1272 return (0); 1273 } 1274 #endif /* BRIDGE_IPF */ 1275 1276 static int 1277 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1278 { 1279 struct ifbreq *req = arg; 1280 struct bridge_iflist *bif; 1281 1282 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1283 if (bif == NULL) 1284 return (ENOENT); 1285 1286 bif->bif_path_cost = req->ifbr_path_cost; 1287 1288 if (sc->sc_if.if_flags & IFF_RUNNING) 1289 bstp_initialization(sc); 1290 1291 bridge_release_member(sc, bif); 1292 1293 return (0); 1294 } 1295 1296 /* 1297 * bridge_ifdetach: 1298 * 1299 * Detach an interface from a bridge. Called when a member 1300 * interface is detaching. 1301 */ 1302 void 1303 bridge_ifdetach(struct ifnet *ifp) 1304 { 1305 struct bridge_softc *sc = ifp->if_bridge; 1306 struct ifbreq breq; 1307 1308 /* ioctl_lock should prevent this from happening */ 1309 KASSERT(sc != NULL); 1310 1311 memset(&breq, 0, sizeof(breq)); 1312 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1313 1314 (void) bridge_ioctl_del(sc, &breq); 1315 } 1316 1317 /* 1318 * bridge_init: 1319 * 1320 * Initialize a bridge interface. 1321 */ 1322 static int 1323 bridge_init(struct ifnet *ifp) 1324 { 1325 struct bridge_softc *sc = ifp->if_softc; 1326 1327 if (ifp->if_flags & IFF_RUNNING) 1328 return (0); 1329 1330 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1331 bridge_timer, sc); 1332 1333 ifp->if_flags |= IFF_RUNNING; 1334 bstp_initialization(sc); 1335 return (0); 1336 } 1337 1338 /* 1339 * bridge_stop: 1340 * 1341 * Stop the bridge interface. 1342 */ 1343 static void 1344 bridge_stop(struct ifnet *ifp, int disable) 1345 { 1346 struct bridge_softc *sc = ifp->if_softc; 1347 1348 if ((ifp->if_flags & IFF_RUNNING) == 0) 1349 return; 1350 1351 callout_stop(&sc->sc_brcallout); 1352 bstp_stop(sc); 1353 1354 bridge_rtflush(sc, IFBF_FLUSHDYN); 1355 1356 ifp->if_flags &= ~IFF_RUNNING; 1357 } 1358 1359 /* 1360 * bridge_enqueue: 1361 * 1362 * Enqueue a packet on a bridge member interface. 1363 */ 1364 void 1365 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1366 int runfilt) 1367 { 1368 ALTQ_DECL(struct altq_pktattr pktattr;) 1369 int len, error; 1370 short mflags; 1371 1372 /* 1373 * Clear any in-bound checksum flags for this packet. 1374 */ 1375 m->m_pkthdr.csum_flags = 0; 1376 1377 if (runfilt) { 1378 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1379 dst_ifp, PFIL_OUT) != 0) { 1380 if (m != NULL) 1381 m_freem(m); 1382 return; 1383 } 1384 if (m == NULL) 1385 return; 1386 } 1387 1388 #ifdef ALTQ 1389 /* 1390 * If ALTQ is enabled on the member interface, do 1391 * classification; the queueing discipline might 1392 * not require classification, but might require 1393 * the address family/header pointer in the pktattr. 1394 */ 1395 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1396 /* XXX IFT_ETHER */ 1397 altq_etherclassify(&dst_ifp->if_snd, m, &pktattr); 1398 } 1399 #endif /* ALTQ */ 1400 1401 len = m->m_pkthdr.len; 1402 m->m_flags |= M_PROTO1; 1403 mflags = m->m_flags; 1404 1405 IFQ_ENQUEUE(&dst_ifp->if_snd, m, &pktattr, error); 1406 1407 if (error) { 1408 /* mbuf is already freed */ 1409 sc->sc_if.if_oerrors++; 1410 return; 1411 } 1412 1413 sc->sc_if.if_opackets++; 1414 sc->sc_if.if_obytes += len; 1415 1416 dst_ifp->if_obytes += len; 1417 1418 if (mflags & M_MCAST) { 1419 sc->sc_if.if_omcasts++; 1420 dst_ifp->if_omcasts++; 1421 } 1422 1423 if ((dst_ifp->if_flags & IFF_OACTIVE) == 0) 1424 (*dst_ifp->if_start)(dst_ifp); 1425 } 1426 1427 /* 1428 * bridge_output: 1429 * 1430 * Send output from a bridge member interface. This 1431 * performs the bridging function for locally originated 1432 * packets. 1433 * 1434 * The mbuf has the Ethernet header already attached. We must 1435 * enqueue or free the mbuf before returning. 1436 */ 1437 int 1438 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1439 struct rtentry *rt) 1440 { 1441 struct ether_header *eh; 1442 struct ifnet *dst_if; 1443 struct bridge_softc *sc; 1444 #ifndef BRIDGE_MPSAFE 1445 int s; 1446 #endif 1447 1448 if (m->m_len < ETHER_HDR_LEN) { 1449 m = m_pullup(m, ETHER_HDR_LEN); 1450 if (m == NULL) 1451 return (0); 1452 } 1453 1454 eh = mtod(m, struct ether_header *); 1455 sc = ifp->if_bridge; 1456 1457 #ifndef BRIDGE_MPSAFE 1458 s = splnet(); 1459 #endif 1460 1461 /* 1462 * If bridge is down, but the original output interface is up, 1463 * go ahead and send out that interface. Otherwise, the packet 1464 * is dropped below. 1465 */ 1466 if (__predict_false(sc == NULL) || 1467 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1468 dst_if = ifp; 1469 goto sendunicast; 1470 } 1471 1472 /* 1473 * If the packet is a multicast, or we don't know a better way to 1474 * get there, send to all interfaces. 1475 */ 1476 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1477 dst_if = NULL; 1478 else 1479 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1480 if (dst_if == NULL) { 1481 struct bridge_iflist *bif; 1482 struct mbuf *mc; 1483 int used = 0; 1484 1485 BRIDGE_LOCK(sc); 1486 1487 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1488 dst_if = bif->bif_ifp; 1489 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1490 continue; 1491 1492 /* 1493 * If this is not the original output interface, 1494 * and the interface is participating in spanning 1495 * tree, make sure the port is in a state that 1496 * allows forwarding. 1497 */ 1498 if (dst_if != ifp && 1499 (bif->bif_flags & IFBIF_STP) != 0) { 1500 switch (bif->bif_state) { 1501 case BSTP_IFSTATE_BLOCKING: 1502 case BSTP_IFSTATE_LISTENING: 1503 case BSTP_IFSTATE_DISABLED: 1504 continue; 1505 } 1506 } 1507 1508 if (LIST_NEXT(bif, bif_next) == NULL) { 1509 used = 1; 1510 mc = m; 1511 } else { 1512 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1513 if (mc == NULL) { 1514 sc->sc_if.if_oerrors++; 1515 continue; 1516 } 1517 } 1518 1519 bridge_enqueue(sc, dst_if, mc, 0); 1520 } 1521 1522 BRIDGE_UNLOCK(sc); 1523 1524 if (used == 0) 1525 m_freem(m); 1526 #ifndef BRIDGE_MPSAFE 1527 splx(s); 1528 #endif 1529 return (0); 1530 } 1531 1532 sendunicast: 1533 /* 1534 * XXX Spanning tree consideration here? 1535 */ 1536 1537 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1538 m_freem(m); 1539 #ifndef BRIDGE_MPSAFE 1540 splx(s); 1541 #endif 1542 return (0); 1543 } 1544 1545 bridge_enqueue(sc, dst_if, m, 0); 1546 1547 #ifndef BRIDGE_MPSAFE 1548 splx(s); 1549 #endif 1550 return (0); 1551 } 1552 1553 /* 1554 * bridge_start: 1555 * 1556 * Start output on a bridge. 1557 * 1558 * NOTE: This routine should never be called in this implementation. 1559 */ 1560 static void 1561 bridge_start(struct ifnet *ifp) 1562 { 1563 1564 printf("%s: bridge_start() called\n", ifp->if_xname); 1565 } 1566 1567 /* 1568 * bridge_forward: 1569 * 1570 * The forwarding function of the bridge. 1571 */ 1572 static void 1573 bridge_forward(void *v) 1574 { 1575 struct bridge_softc *sc = v; 1576 struct mbuf *m; 1577 struct bridge_iflist *bif; 1578 struct ifnet *src_if, *dst_if; 1579 struct ether_header *eh; 1580 #ifndef BRIDGE_MPSAFE 1581 int s; 1582 1583 KERNEL_LOCK(1, NULL); 1584 mutex_enter(softnet_lock); 1585 #endif 1586 1587 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1588 #ifndef BRIDGE_MPSAFE 1589 mutex_exit(softnet_lock); 1590 KERNEL_UNLOCK_ONE(NULL); 1591 #endif 1592 return; 1593 } 1594 1595 #ifndef BRIDGE_MPSAFE 1596 s = splnet(); 1597 #endif 1598 while ((m = pktq_dequeue(sc->sc_fwd_pktq)) != NULL) { 1599 src_if = m->m_pkthdr.rcvif; 1600 1601 sc->sc_if.if_ipackets++; 1602 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1603 1604 /* 1605 * Look up the bridge_iflist. 1606 */ 1607 bif = bridge_lookup_member_if(sc, src_if); 1608 if (bif == NULL) { 1609 /* Interface is not a bridge member (anymore?) */ 1610 m_freem(m); 1611 continue; 1612 } 1613 1614 if (bif->bif_flags & IFBIF_STP) { 1615 switch (bif->bif_state) { 1616 case BSTP_IFSTATE_BLOCKING: 1617 case BSTP_IFSTATE_LISTENING: 1618 case BSTP_IFSTATE_DISABLED: 1619 m_freem(m); 1620 bridge_release_member(sc, bif); 1621 continue; 1622 } 1623 } 1624 1625 eh = mtod(m, struct ether_header *); 1626 1627 /* 1628 * If the interface is learning, and the source 1629 * address is valid and not multicast, record 1630 * the address. 1631 */ 1632 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1633 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1634 (eh->ether_shost[0] == 0 && 1635 eh->ether_shost[1] == 0 && 1636 eh->ether_shost[2] == 0 && 1637 eh->ether_shost[3] == 0 && 1638 eh->ether_shost[4] == 0 && 1639 eh->ether_shost[5] == 0) == 0) { 1640 (void) bridge_rtupdate(sc, eh->ether_shost, 1641 src_if, 0, IFBAF_DYNAMIC); 1642 } 1643 1644 if ((bif->bif_flags & IFBIF_STP) != 0 && 1645 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1646 m_freem(m); 1647 bridge_release_member(sc, bif); 1648 continue; 1649 } 1650 1651 bridge_release_member(sc, bif); 1652 1653 /* 1654 * At this point, the port either doesn't participate 1655 * in spanning tree or it is in the forwarding state. 1656 */ 1657 1658 /* 1659 * If the packet is unicast, destined for someone on 1660 * "this" side of the bridge, drop it. 1661 */ 1662 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1663 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1664 if (src_if == dst_if) { 1665 m_freem(m); 1666 continue; 1667 } 1668 } else { 1669 /* ...forward it to all interfaces. */ 1670 sc->sc_if.if_imcasts++; 1671 dst_if = NULL; 1672 } 1673 1674 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1675 m->m_pkthdr.rcvif, PFIL_IN) != 0) { 1676 if (m != NULL) 1677 m_freem(m); 1678 continue; 1679 } 1680 if (m == NULL) 1681 continue; 1682 1683 if (dst_if == NULL) { 1684 bridge_broadcast(sc, src_if, m); 1685 continue; 1686 } 1687 1688 /* 1689 * At this point, we're dealing with a unicast frame 1690 * going to a different interface. 1691 */ 1692 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1693 m_freem(m); 1694 continue; 1695 } 1696 1697 bif = bridge_lookup_member_if(sc, dst_if); 1698 if (bif == NULL) { 1699 /* Not a member of the bridge (anymore?) */ 1700 m_freem(m); 1701 continue; 1702 } 1703 1704 if (bif->bif_flags & IFBIF_STP) { 1705 switch (bif->bif_state) { 1706 case BSTP_IFSTATE_DISABLED: 1707 case BSTP_IFSTATE_BLOCKING: 1708 m_freem(m); 1709 bridge_release_member(sc, bif); 1710 continue; 1711 } 1712 } 1713 1714 bridge_release_member(sc, bif); 1715 1716 bridge_enqueue(sc, dst_if, m, 1); 1717 } 1718 #ifndef BRIDGE_MPSAFE 1719 splx(s); 1720 mutex_exit(softnet_lock); 1721 KERNEL_UNLOCK_ONE(NULL); 1722 #endif 1723 } 1724 1725 static bool 1726 bstp_state_before_learning(struct bridge_iflist *bif) 1727 { 1728 if (bif->bif_flags & IFBIF_STP) { 1729 switch (bif->bif_state) { 1730 case BSTP_IFSTATE_BLOCKING: 1731 case BSTP_IFSTATE_LISTENING: 1732 case BSTP_IFSTATE_DISABLED: 1733 return true; 1734 } 1735 } 1736 return false; 1737 } 1738 1739 static bool 1740 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1741 { 1742 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1743 1744 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1745 #if NCARP > 0 1746 || (bif->bif_ifp->if_carp && 1747 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1748 #endif /* NCARP > 0 */ 1749 ) 1750 return true; 1751 1752 return false; 1753 } 1754 1755 /* 1756 * bridge_input: 1757 * 1758 * Receive input from a member interface. Queue the packet for 1759 * bridging if it is not for us. 1760 */ 1761 static void 1762 bridge_input(struct ifnet *ifp, struct mbuf *m) 1763 { 1764 struct bridge_softc *sc = ifp->if_bridge; 1765 struct bridge_iflist *bif; 1766 struct ether_header *eh; 1767 1768 if (__predict_false(sc == NULL) || 1769 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1770 ether_input(ifp, m); 1771 return; 1772 } 1773 1774 bif = bridge_lookup_member_if(sc, ifp); 1775 if (bif == NULL) { 1776 ether_input(ifp, m); 1777 return; 1778 } 1779 1780 eh = mtod(m, struct ether_header *); 1781 1782 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1783 if (memcmp(etherbroadcastaddr, 1784 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1785 m->m_flags |= M_BCAST; 1786 else 1787 m->m_flags |= M_MCAST; 1788 } 1789 1790 /* 1791 * A 'fast' path for packets addressed to interfaces that are 1792 * part of this bridge. 1793 */ 1794 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 1795 !bstp_state_before_learning(bif)) { 1796 struct bridge_iflist *_bif; 1797 1798 BRIDGE_LOCK(sc); 1799 LIST_FOREACH(_bif, &sc->sc_iflist, bif_next) { 1800 /* It is destined for us. */ 1801 if (bridge_ourether(_bif, eh, 0)) { 1802 if (_bif->bif_flags & IFBIF_LEARNING) 1803 (void) bridge_rtupdate(sc, 1804 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1805 m->m_pkthdr.rcvif = _bif->bif_ifp; 1806 ether_input(_bif->bif_ifp, m); 1807 break; 1808 } 1809 1810 /* We just received a packet that we sent out. */ 1811 if (bridge_ourether(_bif, eh, 1)) { 1812 m_freem(m); 1813 break; 1814 } 1815 } 1816 BRIDGE_UNLOCK(sc); 1817 1818 if (_bif != NULL) { 1819 bridge_release_member(sc, bif); 1820 return; 1821 } 1822 } 1823 1824 /* Tap off 802.1D packets; they do not get forwarded. */ 1825 if (bif->bif_flags & IFBIF_STP && 1826 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 1827 bstp_input(sc, bif, m); 1828 bridge_release_member(sc, bif); 1829 return; 1830 } 1831 1832 /* 1833 * A normal switch would discard the packet here, but that's not what 1834 * we've done historically. This also prevents some obnoxious behaviour. 1835 */ 1836 if (bstp_state_before_learning(bif)) { 1837 ether_input(ifp, m); 1838 bridge_release_member(sc, bif); 1839 return; 1840 } 1841 1842 bridge_release_member(sc, bif); 1843 1844 /* Queue the packet for bridge forwarding. */ 1845 if (__predict_false(!pktq_enqueue(sc->sc_fwd_pktq, m, 0))) 1846 m_freem(m); 1847 } 1848 1849 /* 1850 * bridge_broadcast: 1851 * 1852 * Send a frame to all interfaces that are members of 1853 * the bridge, except for the one on which the packet 1854 * arrived. 1855 */ 1856 static void 1857 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1858 struct mbuf *m) 1859 { 1860 struct bridge_iflist *bif; 1861 struct mbuf *mc; 1862 struct ifnet *dst_if; 1863 bool used, bmcast; 1864 1865 used = bmcast = m->m_flags & (M_BCAST|M_MCAST); 1866 1867 BRIDGE_LOCK(sc); 1868 1869 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1870 dst_if = bif->bif_ifp; 1871 if (dst_if == src_if) 1872 continue; 1873 1874 if (bif->bif_flags & IFBIF_STP) { 1875 switch (bif->bif_state) { 1876 case BSTP_IFSTATE_BLOCKING: 1877 case BSTP_IFSTATE_DISABLED: 1878 continue; 1879 } 1880 } 1881 1882 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 1883 continue; 1884 1885 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1886 continue; 1887 1888 if (!used && LIST_NEXT(bif, bif_next) == NULL) { 1889 mc = m; 1890 used = true; 1891 } else { 1892 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1893 if (mc == NULL) { 1894 sc->sc_if.if_oerrors++; 1895 continue; 1896 } 1897 } 1898 1899 bridge_enqueue(sc, dst_if, mc, 1); 1900 } 1901 1902 if (bmcast) 1903 ether_input(src_if, m); 1904 else if (!used) 1905 m_freem(m); 1906 1907 BRIDGE_UNLOCK(sc); 1908 } 1909 1910 /* 1911 * bridge_rtupdate: 1912 * 1913 * Add a bridge routing entry. 1914 */ 1915 static int 1916 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 1917 struct ifnet *dst_if, int setflags, uint8_t flags) 1918 { 1919 struct bridge_rtnode *brt; 1920 int error = 0; 1921 1922 mutex_enter(sc->sc_rtlist_lock); 1923 1924 /* 1925 * A route for this destination might already exist. If so, 1926 * update it, otherwise create a new one. 1927 */ 1928 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) { 1929 if (sc->sc_brtcnt >= sc->sc_brtmax) { 1930 error = ENOSPC; 1931 goto out; 1932 } 1933 1934 /* 1935 * Allocate a new bridge forwarding node, and 1936 * initialize the expiration time and Ethernet 1937 * address. 1938 */ 1939 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 1940 if (brt == NULL) { 1941 error = ENOMEM; 1942 goto out; 1943 } 1944 1945 memset(brt, 0, sizeof(*brt)); 1946 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1947 brt->brt_flags = IFBAF_DYNAMIC; 1948 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 1949 1950 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 1951 pool_put(&bridge_rtnode_pool, brt); 1952 goto out; 1953 } 1954 } 1955 1956 brt->brt_ifp = dst_if; 1957 if (setflags) { 1958 brt->brt_flags = flags; 1959 if (flags & IFBAF_STATIC) 1960 brt->brt_expire = 0; 1961 else 1962 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1963 } 1964 1965 out: 1966 mutex_exit(sc->sc_rtlist_lock); 1967 1968 return error; 1969 } 1970 1971 /* 1972 * bridge_rtlookup: 1973 * 1974 * Lookup the destination interface for an address. 1975 */ 1976 static struct ifnet * 1977 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 1978 { 1979 struct bridge_rtnode *brt; 1980 struct ifnet *ifs = NULL; 1981 1982 mutex_enter(sc->sc_rtlist_lock); 1983 1984 brt = bridge_rtnode_lookup(sc, addr); 1985 if (brt != NULL) 1986 ifs = brt->brt_ifp; 1987 1988 mutex_exit(sc->sc_rtlist_lock); 1989 1990 return ifs; 1991 } 1992 1993 /* 1994 * bridge_rttrim: 1995 * 1996 * Trim the routine table so that we have a number 1997 * of routing entries less than or equal to the 1998 * maximum number. 1999 */ 2000 static void 2001 bridge_rttrim(struct bridge_softc *sc) 2002 { 2003 struct bridge_rtnode *brt, *nbrt; 2004 2005 mutex_enter(sc->sc_rtlist_lock); 2006 2007 /* Make sure we actually need to do this. */ 2008 if (sc->sc_brtcnt <= sc->sc_brtmax) 2009 goto out; 2010 2011 /* Force an aging cycle; this might trim enough addresses. */ 2012 bridge_rtage(sc); 2013 if (sc->sc_brtcnt <= sc->sc_brtmax) 2014 goto out; 2015 2016 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2017 nbrt = LIST_NEXT(brt, brt_list); 2018 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2019 bridge_rtnode_destroy(sc, brt); 2020 if (sc->sc_brtcnt <= sc->sc_brtmax) 2021 goto out; 2022 } 2023 } 2024 2025 out: 2026 mutex_exit(sc->sc_rtlist_lock); 2027 2028 return; 2029 } 2030 2031 /* 2032 * bridge_timer: 2033 * 2034 * Aging timer for the bridge. 2035 */ 2036 static void 2037 bridge_timer(void *arg) 2038 { 2039 struct bridge_softc *sc = arg; 2040 2041 mutex_enter(sc->sc_rtlist_lock); 2042 2043 bridge_rtage(sc); 2044 2045 if (sc->sc_if.if_flags & IFF_RUNNING) 2046 callout_reset(&sc->sc_brcallout, 2047 bridge_rtable_prune_period * hz, bridge_timer, sc); 2048 2049 mutex_exit(sc->sc_rtlist_lock); 2050 } 2051 2052 /* 2053 * bridge_rtage: 2054 * 2055 * Perform an aging cycle. 2056 */ 2057 static void 2058 bridge_rtage(struct bridge_softc *sc) 2059 { 2060 struct bridge_rtnode *brt, *nbrt; 2061 2062 KASSERT(mutex_owned(sc->sc_rtlist_lock)); 2063 2064 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2065 nbrt = LIST_NEXT(brt, brt_list); 2066 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2067 if (time_uptime >= brt->brt_expire) 2068 bridge_rtnode_destroy(sc, brt); 2069 } 2070 } 2071 } 2072 2073 /* 2074 * bridge_rtflush: 2075 * 2076 * Remove all dynamic addresses from the bridge. 2077 */ 2078 static void 2079 bridge_rtflush(struct bridge_softc *sc, int full) 2080 { 2081 struct bridge_rtnode *brt, *nbrt; 2082 2083 mutex_enter(sc->sc_rtlist_lock); 2084 2085 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2086 nbrt = LIST_NEXT(brt, brt_list); 2087 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2088 bridge_rtnode_destroy(sc, brt); 2089 } 2090 2091 mutex_exit(sc->sc_rtlist_lock); 2092 } 2093 2094 /* 2095 * bridge_rtdaddr: 2096 * 2097 * Remove an address from the table. 2098 */ 2099 static int 2100 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2101 { 2102 struct bridge_rtnode *brt; 2103 int error = 0; 2104 2105 mutex_enter(sc->sc_rtlist_lock); 2106 2107 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2108 error = ENOENT; 2109 goto out; 2110 } 2111 2112 bridge_rtnode_destroy(sc, brt); 2113 2114 out: 2115 mutex_exit(sc->sc_rtlist_lock); 2116 2117 return error; 2118 } 2119 2120 /* 2121 * bridge_rtdelete: 2122 * 2123 * Delete routes to a speicifc member interface. 2124 */ 2125 static void 2126 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2127 { 2128 struct bridge_rtnode *brt, *nbrt; 2129 2130 mutex_enter(sc->sc_rtlist_lock); 2131 2132 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2133 nbrt = LIST_NEXT(brt, brt_list); 2134 if (brt->brt_ifp == ifp) 2135 bridge_rtnode_destroy(sc, brt); 2136 } 2137 2138 mutex_exit(sc->sc_rtlist_lock); 2139 } 2140 2141 /* 2142 * bridge_rtable_init: 2143 * 2144 * Initialize the route table for this bridge. 2145 */ 2146 static int 2147 bridge_rtable_init(struct bridge_softc *sc) 2148 { 2149 int i; 2150 2151 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2152 M_DEVBUF, M_NOWAIT); 2153 if (sc->sc_rthash == NULL) 2154 return (ENOMEM); 2155 2156 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2157 LIST_INIT(&sc->sc_rthash[i]); 2158 2159 sc->sc_rthash_key = cprng_fast32(); 2160 2161 LIST_INIT(&sc->sc_rtlist); 2162 2163 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NET); 2164 2165 return (0); 2166 } 2167 2168 /* 2169 * bridge_rtable_fini: 2170 * 2171 * Deconstruct the route table for this bridge. 2172 */ 2173 static void 2174 bridge_rtable_fini(struct bridge_softc *sc) 2175 { 2176 2177 free(sc->sc_rthash, M_DEVBUF); 2178 if (sc->sc_rtlist_lock) 2179 mutex_obj_free(sc->sc_rtlist_lock); 2180 } 2181 2182 /* 2183 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2184 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2185 */ 2186 #define mix(a, b, c) \ 2187 do { \ 2188 a -= b; a -= c; a ^= (c >> 13); \ 2189 b -= c; b -= a; b ^= (a << 8); \ 2190 c -= a; c -= b; c ^= (b >> 13); \ 2191 a -= b; a -= c; a ^= (c >> 12); \ 2192 b -= c; b -= a; b ^= (a << 16); \ 2193 c -= a; c -= b; c ^= (b >> 5); \ 2194 a -= b; a -= c; a ^= (c >> 3); \ 2195 b -= c; b -= a; b ^= (a << 10); \ 2196 c -= a; c -= b; c ^= (b >> 15); \ 2197 } while (/*CONSTCOND*/0) 2198 2199 static inline uint32_t 2200 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2201 { 2202 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2203 2204 b += addr[5] << 8; 2205 b += addr[4]; 2206 a += addr[3] << 24; 2207 a += addr[2] << 16; 2208 a += addr[1] << 8; 2209 a += addr[0]; 2210 2211 mix(a, b, c); 2212 2213 return (c & BRIDGE_RTHASH_MASK); 2214 } 2215 2216 #undef mix 2217 2218 /* 2219 * bridge_rtnode_lookup: 2220 * 2221 * Look up a bridge route node for the specified destination. 2222 */ 2223 static struct bridge_rtnode * 2224 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2225 { 2226 struct bridge_rtnode *brt; 2227 uint32_t hash; 2228 int dir; 2229 2230 KASSERT(mutex_owned(sc->sc_rtlist_lock)); 2231 2232 hash = bridge_rthash(sc, addr); 2233 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2234 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2235 if (dir == 0) 2236 return (brt); 2237 if (dir > 0) 2238 return (NULL); 2239 } 2240 2241 return (NULL); 2242 } 2243 2244 /* 2245 * bridge_rtnode_insert: 2246 * 2247 * Insert the specified bridge node into the route table. We 2248 * assume the entry is not already in the table. 2249 */ 2250 static int 2251 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2252 { 2253 struct bridge_rtnode *lbrt; 2254 uint32_t hash; 2255 int dir; 2256 2257 KASSERT(mutex_owned(sc->sc_rtlist_lock)); 2258 2259 hash = bridge_rthash(sc, brt->brt_addr); 2260 2261 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2262 if (lbrt == NULL) { 2263 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2264 goto out; 2265 } 2266 2267 do { 2268 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2269 if (dir == 0) 2270 return (EEXIST); 2271 if (dir > 0) { 2272 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2273 goto out; 2274 } 2275 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2276 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2277 goto out; 2278 } 2279 lbrt = LIST_NEXT(lbrt, brt_hash); 2280 } while (lbrt != NULL); 2281 2282 #ifdef DIAGNOSTIC 2283 panic("bridge_rtnode_insert: impossible"); 2284 #endif 2285 2286 out: 2287 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2288 sc->sc_brtcnt++; 2289 2290 return (0); 2291 } 2292 2293 /* 2294 * bridge_rtnode_destroy: 2295 * 2296 * Destroy a bridge rtnode. 2297 */ 2298 static void 2299 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2300 { 2301 2302 KASSERT(mutex_owned(sc->sc_rtlist_lock)); 2303 2304 LIST_REMOVE(brt, brt_hash); 2305 2306 LIST_REMOVE(brt, brt_list); 2307 sc->sc_brtcnt--; 2308 pool_put(&bridge_rtnode_pool, brt); 2309 } 2310 2311 #if defined(BRIDGE_IPF) 2312 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2313 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2314 2315 /* 2316 * Send bridge packets through IPF if they are one of the types IPF can deal 2317 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2318 * question.) 2319 */ 2320 static int 2321 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2322 { 2323 int snap, error; 2324 struct ether_header *eh1, eh2; 2325 struct llc llc1; 2326 uint16_t ether_type; 2327 2328 snap = 0; 2329 error = -1; /* Default error if not error == 0 */ 2330 eh1 = mtod(*mp, struct ether_header *); 2331 ether_type = ntohs(eh1->ether_type); 2332 2333 /* 2334 * Check for SNAP/LLC. 2335 */ 2336 if (ether_type < ETHERMTU) { 2337 struct llc *llc2 = (struct llc *)(eh1 + 1); 2338 2339 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2340 llc2->llc_dsap == LLC_SNAP_LSAP && 2341 llc2->llc_ssap == LLC_SNAP_LSAP && 2342 llc2->llc_control == LLC_UI) { 2343 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2344 snap = 1; 2345 } 2346 } 2347 2348 /* 2349 * If we're trying to filter bridge traffic, don't look at anything 2350 * other than IP and ARP traffic. If the filter doesn't understand 2351 * IPv6, don't allow IPv6 through the bridge either. This is lame 2352 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2353 * but of course we don't have an AppleTalk filter to begin with. 2354 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2355 * ARP traffic.) 2356 */ 2357 switch (ether_type) { 2358 case ETHERTYPE_ARP: 2359 case ETHERTYPE_REVARP: 2360 return 0; /* Automatically pass */ 2361 case ETHERTYPE_IP: 2362 # ifdef INET6 2363 case ETHERTYPE_IPV6: 2364 # endif /* INET6 */ 2365 break; 2366 default: 2367 goto bad; 2368 } 2369 2370 /* Strip off the Ethernet header and keep a copy. */ 2371 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2372 m_adj(*mp, ETHER_HDR_LEN); 2373 2374 /* Strip off snap header, if present */ 2375 if (snap) { 2376 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2377 m_adj(*mp, sizeof(struct llc)); 2378 } 2379 2380 /* 2381 * Check basic packet sanity and run IPF through pfil. 2382 */ 2383 KASSERT(!cpu_intr_p()); 2384 switch (ether_type) 2385 { 2386 case ETHERTYPE_IP : 2387 error = (dir == PFIL_IN) ? bridge_ip_checkbasic(mp) : 0; 2388 if (error == 0) 2389 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2390 break; 2391 # ifdef INET6 2392 case ETHERTYPE_IPV6 : 2393 error = (dir == PFIL_IN) ? bridge_ip6_checkbasic(mp) : 0; 2394 if (error == 0) 2395 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2396 break; 2397 # endif 2398 default : 2399 error = 0; 2400 break; 2401 } 2402 2403 if (*mp == NULL) 2404 return error; 2405 if (error != 0) 2406 goto bad; 2407 2408 error = -1; 2409 2410 /* 2411 * Finally, put everything back the way it was and return 2412 */ 2413 if (snap) { 2414 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2415 if (*mp == NULL) 2416 return error; 2417 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2418 } 2419 2420 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2421 if (*mp == NULL) 2422 return error; 2423 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2424 2425 return 0; 2426 2427 bad: 2428 m_freem(*mp); 2429 *mp = NULL; 2430 return error; 2431 } 2432 2433 /* 2434 * Perform basic checks on header size since 2435 * IPF assumes ip_input has already processed 2436 * it for it. Cut-and-pasted from ip_input.c. 2437 * Given how simple the IPv6 version is, 2438 * does the IPv4 version really need to be 2439 * this complicated? 2440 * 2441 * XXX Should we update ipstat here, or not? 2442 * XXX Right now we update ipstat but not 2443 * XXX csum_counter. 2444 */ 2445 static int 2446 bridge_ip_checkbasic(struct mbuf **mp) 2447 { 2448 struct mbuf *m = *mp; 2449 struct ip *ip; 2450 int len, hlen; 2451 2452 if (*mp == NULL) 2453 return -1; 2454 2455 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2456 if ((m = m_copyup(m, sizeof(struct ip), 2457 (max_linkhdr + 3) & ~3)) == NULL) { 2458 /* XXXJRT new stat, please */ 2459 ip_statinc(IP_STAT_TOOSMALL); 2460 goto bad; 2461 } 2462 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2463 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2464 ip_statinc(IP_STAT_TOOSMALL); 2465 goto bad; 2466 } 2467 } 2468 ip = mtod(m, struct ip *); 2469 if (ip == NULL) goto bad; 2470 2471 if (ip->ip_v != IPVERSION) { 2472 ip_statinc(IP_STAT_BADVERS); 2473 goto bad; 2474 } 2475 hlen = ip->ip_hl << 2; 2476 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2477 ip_statinc(IP_STAT_BADHLEN); 2478 goto bad; 2479 } 2480 if (hlen > m->m_len) { 2481 if ((m = m_pullup(m, hlen)) == 0) { 2482 ip_statinc(IP_STAT_BADHLEN); 2483 goto bad; 2484 } 2485 ip = mtod(m, struct ip *); 2486 if (ip == NULL) goto bad; 2487 } 2488 2489 switch (m->m_pkthdr.csum_flags & 2490 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 2491 M_CSUM_IPv4_BAD)) { 2492 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2493 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2494 goto bad; 2495 2496 case M_CSUM_IPv4: 2497 /* Checksum was okay. */ 2498 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2499 break; 2500 2501 default: 2502 /* Must compute it ourselves. */ 2503 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2504 if (in_cksum(m, hlen) != 0) 2505 goto bad; 2506 break; 2507 } 2508 2509 /* Retrieve the packet length. */ 2510 len = ntohs(ip->ip_len); 2511 2512 /* 2513 * Check for additional length bogosity 2514 */ 2515 if (len < hlen) { 2516 ip_statinc(IP_STAT_BADLEN); 2517 goto bad; 2518 } 2519 2520 /* 2521 * Check that the amount of data in the buffers 2522 * is as at least much as the IP header would have us expect. 2523 * Drop packet if shorter than we expect. 2524 */ 2525 if (m->m_pkthdr.len < len) { 2526 ip_statinc(IP_STAT_TOOSHORT); 2527 goto bad; 2528 } 2529 2530 /* Checks out, proceed */ 2531 *mp = m; 2532 return 0; 2533 2534 bad: 2535 *mp = m; 2536 return -1; 2537 } 2538 2539 # ifdef INET6 2540 /* 2541 * Same as above, but for IPv6. 2542 * Cut-and-pasted from ip6_input.c. 2543 * XXX Should we update ip6stat, or not? 2544 */ 2545 static int 2546 bridge_ip6_checkbasic(struct mbuf **mp) 2547 { 2548 struct mbuf *m = *mp; 2549 struct ip6_hdr *ip6; 2550 2551 /* 2552 * If the IPv6 header is not aligned, slurp it up into a new 2553 * mbuf with space for link headers, in the event we forward 2554 * it. Otherwise, if it is aligned, make sure the entire base 2555 * IPv6 header is in the first mbuf of the chain. 2556 */ 2557 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2558 struct ifnet *inifp = m->m_pkthdr.rcvif; 2559 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2560 (max_linkhdr + 3) & ~3)) == NULL) { 2561 /* XXXJRT new stat, please */ 2562 ip6_statinc(IP6_STAT_TOOSMALL); 2563 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2564 goto bad; 2565 } 2566 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2567 struct ifnet *inifp = m->m_pkthdr.rcvif; 2568 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2569 ip6_statinc(IP6_STAT_TOOSMALL); 2570 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2571 goto bad; 2572 } 2573 } 2574 2575 ip6 = mtod(m, struct ip6_hdr *); 2576 2577 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2578 ip6_statinc(IP6_STAT_BADVERS); 2579 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 2580 goto bad; 2581 } 2582 2583 /* Checks out, proceed */ 2584 *mp = m; 2585 return 0; 2586 2587 bad: 2588 *mp = m; 2589 return -1; 2590 } 2591 # endif /* INET6 */ 2592 #endif /* BRIDGE_IPF */ 2593
Indexes created Fri Oct 03 02:09:57 GMT 2025