if_bridge.c revision 1.89
1 /* $NetBSD: if_bridge.c,v 1.89 2014/07/23 04:09:48 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 1.89 2014/07/23 04:09:48 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 BRIDGE_UNLOCK(sc); 993 bifc->ifbic_len = sizeof(breq) * count; 994 return (0); 995 } 996 997 count = 0; 998 len = bifc->ifbic_len; 999 memset(&breq, 0, sizeof breq); 1000 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1001 if (len < sizeof(breq)) 1002 break; 1003 1004 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1005 sizeof(breq.ifbr_ifsname)); 1006 breq.ifbr_ifsflags = bif->bif_flags; 1007 breq.ifbr_state = bif->bif_state; 1008 breq.ifbr_priority = bif->bif_priority; 1009 breq.ifbr_path_cost = bif->bif_path_cost; 1010 breq.ifbr_portno = bif->bif_ifp->if_index & 0xff; 1011 error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq)); 1012 if (error) 1013 break; 1014 count++; 1015 len -= sizeof(breq); 1016 } 1017 1018 BRIDGE_UNLOCK(sc); 1019 1020 bifc->ifbic_len = sizeof(breq) * count; 1021 return (error); 1022 } 1023 1024 static int 1025 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1026 { 1027 struct ifbaconf *bac = arg; 1028 struct bridge_rtnode *brt; 1029 struct ifbareq bareq; 1030 int count = 0, error = 0, len; 1031 1032 if (bac->ifbac_len == 0) 1033 return (0); 1034 1035 mutex_enter(sc->sc_rtlist_lock); 1036 1037 len = bac->ifbac_len; 1038 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1039 if (len < sizeof(bareq)) 1040 goto out; 1041 memset(&bareq, 0, sizeof(bareq)); 1042 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1043 sizeof(bareq.ifba_ifsname)); 1044 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1045 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1046 bareq.ifba_expire = brt->brt_expire - time_uptime; 1047 } else 1048 bareq.ifba_expire = 0; 1049 bareq.ifba_flags = brt->brt_flags; 1050 1051 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1052 if (error) 1053 goto out; 1054 count++; 1055 len -= sizeof(bareq); 1056 } 1057 out: 1058 mutex_exit(sc->sc_rtlist_lock); 1059 1060 bac->ifbac_len = sizeof(bareq) * count; 1061 return (error); 1062 } 1063 1064 static int 1065 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1066 { 1067 struct ifbareq *req = arg; 1068 struct bridge_iflist *bif; 1069 int error; 1070 1071 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1072 if (bif == NULL) 1073 return (ENOENT); 1074 1075 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1076 req->ifba_flags); 1077 1078 bridge_release_member(sc, bif); 1079 1080 return (error); 1081 } 1082 1083 static int 1084 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1085 { 1086 struct ifbrparam *param = arg; 1087 1088 sc->sc_brttimeout = param->ifbrp_ctime; 1089 1090 return (0); 1091 } 1092 1093 static int 1094 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1095 { 1096 struct ifbrparam *param = arg; 1097 1098 param->ifbrp_ctime = sc->sc_brttimeout; 1099 1100 return (0); 1101 } 1102 1103 static int 1104 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1105 { 1106 struct ifbareq *req = arg; 1107 1108 return (bridge_rtdaddr(sc, req->ifba_dst)); 1109 } 1110 1111 static int 1112 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1113 { 1114 struct ifbreq *req = arg; 1115 1116 bridge_rtflush(sc, req->ifbr_ifsflags); 1117 1118 return (0); 1119 } 1120 1121 static int 1122 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1123 { 1124 struct ifbrparam *param = arg; 1125 1126 param->ifbrp_prio = sc->sc_bridge_priority; 1127 1128 return (0); 1129 } 1130 1131 static int 1132 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1133 { 1134 struct ifbrparam *param = arg; 1135 1136 sc->sc_bridge_priority = param->ifbrp_prio; 1137 1138 if (sc->sc_if.if_flags & IFF_RUNNING) 1139 bstp_initialization(sc); 1140 1141 return (0); 1142 } 1143 1144 static int 1145 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1146 { 1147 struct ifbrparam *param = arg; 1148 1149 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1150 1151 return (0); 1152 } 1153 1154 static int 1155 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1156 { 1157 struct ifbrparam *param = arg; 1158 1159 if (param->ifbrp_hellotime == 0) 1160 return (EINVAL); 1161 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1162 1163 if (sc->sc_if.if_flags & IFF_RUNNING) 1164 bstp_initialization(sc); 1165 1166 return (0); 1167 } 1168 1169 static int 1170 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1171 { 1172 struct ifbrparam *param = arg; 1173 1174 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1175 1176 return (0); 1177 } 1178 1179 static int 1180 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1181 { 1182 struct ifbrparam *param = arg; 1183 1184 if (param->ifbrp_fwddelay == 0) 1185 return (EINVAL); 1186 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1187 1188 if (sc->sc_if.if_flags & IFF_RUNNING) 1189 bstp_initialization(sc); 1190 1191 return (0); 1192 } 1193 1194 static int 1195 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1196 { 1197 struct ifbrparam *param = arg; 1198 1199 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1200 1201 return (0); 1202 } 1203 1204 static int 1205 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1206 { 1207 struct ifbrparam *param = arg; 1208 1209 if (param->ifbrp_maxage == 0) 1210 return (EINVAL); 1211 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1212 1213 if (sc->sc_if.if_flags & IFF_RUNNING) 1214 bstp_initialization(sc); 1215 1216 return (0); 1217 } 1218 1219 static int 1220 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1221 { 1222 struct ifbreq *req = arg; 1223 struct bridge_iflist *bif; 1224 1225 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1226 if (bif == NULL) 1227 return (ENOENT); 1228 1229 bif->bif_priority = req->ifbr_priority; 1230 1231 if (sc->sc_if.if_flags & IFF_RUNNING) 1232 bstp_initialization(sc); 1233 1234 bridge_release_member(sc, bif); 1235 1236 return (0); 1237 } 1238 1239 #if defined(BRIDGE_IPF) 1240 static int 1241 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1242 { 1243 struct ifbrparam *param = arg; 1244 1245 param->ifbrp_filter = sc->sc_filter_flags; 1246 1247 return (0); 1248 } 1249 1250 static int 1251 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1252 { 1253 struct ifbrparam *param = arg; 1254 uint32_t nflags, oflags; 1255 1256 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1257 return (EINVAL); 1258 1259 nflags = param->ifbrp_filter; 1260 oflags = sc->sc_filter_flags; 1261 1262 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1263 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1264 sc->sc_if.if_pfil); 1265 } 1266 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1267 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1268 sc->sc_if.if_pfil); 1269 } 1270 1271 sc->sc_filter_flags = nflags; 1272 1273 return (0); 1274 } 1275 #endif /* BRIDGE_IPF */ 1276 1277 static int 1278 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1279 { 1280 struct ifbreq *req = arg; 1281 struct bridge_iflist *bif; 1282 1283 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1284 if (bif == NULL) 1285 return (ENOENT); 1286 1287 bif->bif_path_cost = req->ifbr_path_cost; 1288 1289 if (sc->sc_if.if_flags & IFF_RUNNING) 1290 bstp_initialization(sc); 1291 1292 bridge_release_member(sc, bif); 1293 1294 return (0); 1295 } 1296 1297 /* 1298 * bridge_ifdetach: 1299 * 1300 * Detach an interface from a bridge. Called when a member 1301 * interface is detaching. 1302 */ 1303 void 1304 bridge_ifdetach(struct ifnet *ifp) 1305 { 1306 struct bridge_softc *sc = ifp->if_bridge; 1307 struct ifbreq breq; 1308 1309 /* ioctl_lock should prevent this from happening */ 1310 KASSERT(sc != NULL); 1311 1312 memset(&breq, 0, sizeof(breq)); 1313 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1314 1315 (void) bridge_ioctl_del(sc, &breq); 1316 } 1317 1318 /* 1319 * bridge_init: 1320 * 1321 * Initialize a bridge interface. 1322 */ 1323 static int 1324 bridge_init(struct ifnet *ifp) 1325 { 1326 struct bridge_softc *sc = ifp->if_softc; 1327 1328 if (ifp->if_flags & IFF_RUNNING) 1329 return (0); 1330 1331 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1332 bridge_timer, sc); 1333 1334 ifp->if_flags |= IFF_RUNNING; 1335 bstp_initialization(sc); 1336 return (0); 1337 } 1338 1339 /* 1340 * bridge_stop: 1341 * 1342 * Stop the bridge interface. 1343 */ 1344 static void 1345 bridge_stop(struct ifnet *ifp, int disable) 1346 { 1347 struct bridge_softc *sc = ifp->if_softc; 1348 1349 if ((ifp->if_flags & IFF_RUNNING) == 0) 1350 return; 1351 1352 callout_stop(&sc->sc_brcallout); 1353 bstp_stop(sc); 1354 1355 bridge_rtflush(sc, IFBF_FLUSHDYN); 1356 1357 ifp->if_flags &= ~IFF_RUNNING; 1358 } 1359 1360 /* 1361 * bridge_enqueue: 1362 * 1363 * Enqueue a packet on a bridge member interface. 1364 */ 1365 void 1366 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1367 int runfilt) 1368 { 1369 ALTQ_DECL(struct altq_pktattr pktattr;) 1370 int len, error; 1371 short mflags; 1372 1373 /* 1374 * Clear any in-bound checksum flags for this packet. 1375 */ 1376 m->m_pkthdr.csum_flags = 0; 1377 1378 if (runfilt) { 1379 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1380 dst_ifp, PFIL_OUT) != 0) { 1381 if (m != NULL) 1382 m_freem(m); 1383 return; 1384 } 1385 if (m == NULL) 1386 return; 1387 } 1388 1389 #ifdef ALTQ 1390 /* 1391 * If ALTQ is enabled on the member interface, do 1392 * classification; the queueing discipline might 1393 * not require classification, but might require 1394 * the address family/header pointer in the pktattr. 1395 */ 1396 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1397 /* XXX IFT_ETHER */ 1398 altq_etherclassify(&dst_ifp->if_snd, m, &pktattr); 1399 } 1400 #endif /* ALTQ */ 1401 1402 len = m->m_pkthdr.len; 1403 m->m_flags |= M_PROTO1; 1404 mflags = m->m_flags; 1405 1406 IFQ_ENQUEUE(&dst_ifp->if_snd, m, &pktattr, error); 1407 1408 if (error) { 1409 /* mbuf is already freed */ 1410 sc->sc_if.if_oerrors++; 1411 return; 1412 } 1413 1414 sc->sc_if.if_opackets++; 1415 sc->sc_if.if_obytes += len; 1416 1417 dst_ifp->if_obytes += len; 1418 1419 if (mflags & M_MCAST) { 1420 sc->sc_if.if_omcasts++; 1421 dst_ifp->if_omcasts++; 1422 } 1423 1424 if ((dst_ifp->if_flags & IFF_OACTIVE) == 0) 1425 (*dst_ifp->if_start)(dst_ifp); 1426 } 1427 1428 /* 1429 * bridge_output: 1430 * 1431 * Send output from a bridge member interface. This 1432 * performs the bridging function for locally originated 1433 * packets. 1434 * 1435 * The mbuf has the Ethernet header already attached. We must 1436 * enqueue or free the mbuf before returning. 1437 */ 1438 int 1439 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1440 struct rtentry *rt) 1441 { 1442 struct ether_header *eh; 1443 struct ifnet *dst_if; 1444 struct bridge_softc *sc; 1445 #ifndef BRIDGE_MPSAFE 1446 int s; 1447 #endif 1448 1449 if (m->m_len < ETHER_HDR_LEN) { 1450 m = m_pullup(m, ETHER_HDR_LEN); 1451 if (m == NULL) 1452 return (0); 1453 } 1454 1455 eh = mtod(m, struct ether_header *); 1456 sc = ifp->if_bridge; 1457 1458 #ifndef BRIDGE_MPSAFE 1459 s = splnet(); 1460 #endif 1461 1462 /* 1463 * If bridge is down, but the original output interface is up, 1464 * go ahead and send out that interface. Otherwise, the packet 1465 * is dropped below. 1466 */ 1467 if (__predict_false(sc == NULL) || 1468 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1469 dst_if = ifp; 1470 goto sendunicast; 1471 } 1472 1473 /* 1474 * If the packet is a multicast, or we don't know a better way to 1475 * get there, send to all interfaces. 1476 */ 1477 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1478 dst_if = NULL; 1479 else 1480 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1481 if (dst_if == NULL) { 1482 struct bridge_iflist *bif; 1483 struct mbuf *mc; 1484 int used = 0; 1485 1486 BRIDGE_LOCK(sc); 1487 1488 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1489 dst_if = bif->bif_ifp; 1490 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1491 continue; 1492 1493 /* 1494 * If this is not the original output interface, 1495 * and the interface is participating in spanning 1496 * tree, make sure the port is in a state that 1497 * allows forwarding. 1498 */ 1499 if (dst_if != ifp && 1500 (bif->bif_flags & IFBIF_STP) != 0) { 1501 switch (bif->bif_state) { 1502 case BSTP_IFSTATE_BLOCKING: 1503 case BSTP_IFSTATE_LISTENING: 1504 case BSTP_IFSTATE_DISABLED: 1505 continue; 1506 } 1507 } 1508 1509 if (LIST_NEXT(bif, bif_next) == NULL) { 1510 used = 1; 1511 mc = m; 1512 } else { 1513 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1514 if (mc == NULL) { 1515 sc->sc_if.if_oerrors++; 1516 continue; 1517 } 1518 } 1519 1520 bridge_enqueue(sc, dst_if, mc, 0); 1521 } 1522 1523 BRIDGE_UNLOCK(sc); 1524 1525 if (used == 0) 1526 m_freem(m); 1527 #ifndef BRIDGE_MPSAFE 1528 splx(s); 1529 #endif 1530 return (0); 1531 } 1532 1533 sendunicast: 1534 /* 1535 * XXX Spanning tree consideration here? 1536 */ 1537 1538 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1539 m_freem(m); 1540 #ifndef BRIDGE_MPSAFE 1541 splx(s); 1542 #endif 1543 return (0); 1544 } 1545 1546 bridge_enqueue(sc, dst_if, m, 0); 1547 1548 #ifndef BRIDGE_MPSAFE 1549 splx(s); 1550 #endif 1551 return (0); 1552 } 1553 1554 /* 1555 * bridge_start: 1556 * 1557 * Start output on a bridge. 1558 * 1559 * NOTE: This routine should never be called in this implementation. 1560 */ 1561 static void 1562 bridge_start(struct ifnet *ifp) 1563 { 1564 1565 printf("%s: bridge_start() called\n", ifp->if_xname); 1566 } 1567 1568 /* 1569 * bridge_forward: 1570 * 1571 * The forwarding function of the bridge. 1572 */ 1573 static void 1574 bridge_forward(void *v) 1575 { 1576 struct bridge_softc *sc = v; 1577 struct mbuf *m; 1578 struct bridge_iflist *bif; 1579 struct ifnet *src_if, *dst_if; 1580 struct ether_header *eh; 1581 #ifndef BRIDGE_MPSAFE 1582 int s; 1583 1584 KERNEL_LOCK(1, NULL); 1585 mutex_enter(softnet_lock); 1586 #endif 1587 1588 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1589 #ifndef BRIDGE_MPSAFE 1590 mutex_exit(softnet_lock); 1591 KERNEL_UNLOCK_ONE(NULL); 1592 #endif 1593 return; 1594 } 1595 1596 #ifndef BRIDGE_MPSAFE 1597 s = splnet(); 1598 #endif 1599 while ((m = pktq_dequeue(sc->sc_fwd_pktq)) != NULL) { 1600 src_if = m->m_pkthdr.rcvif; 1601 1602 sc->sc_if.if_ipackets++; 1603 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1604 1605 /* 1606 * Look up the bridge_iflist. 1607 */ 1608 bif = bridge_lookup_member_if(sc, src_if); 1609 if (bif == NULL) { 1610 /* Interface is not a bridge member (anymore?) */ 1611 m_freem(m); 1612 continue; 1613 } 1614 1615 if (bif->bif_flags & IFBIF_STP) { 1616 switch (bif->bif_state) { 1617 case BSTP_IFSTATE_BLOCKING: 1618 case BSTP_IFSTATE_LISTENING: 1619 case BSTP_IFSTATE_DISABLED: 1620 m_freem(m); 1621 bridge_release_member(sc, bif); 1622 continue; 1623 } 1624 } 1625 1626 eh = mtod(m, struct ether_header *); 1627 1628 /* 1629 * If the interface is learning, and the source 1630 * address is valid and not multicast, record 1631 * the address. 1632 */ 1633 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1634 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1635 (eh->ether_shost[0] == 0 && 1636 eh->ether_shost[1] == 0 && 1637 eh->ether_shost[2] == 0 && 1638 eh->ether_shost[3] == 0 && 1639 eh->ether_shost[4] == 0 && 1640 eh->ether_shost[5] == 0) == 0) { 1641 (void) bridge_rtupdate(sc, eh->ether_shost, 1642 src_if, 0, IFBAF_DYNAMIC); 1643 } 1644 1645 if ((bif->bif_flags & IFBIF_STP) != 0 && 1646 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1647 m_freem(m); 1648 bridge_release_member(sc, bif); 1649 continue; 1650 } 1651 1652 bridge_release_member(sc, bif); 1653 1654 /* 1655 * At this point, the port either doesn't participate 1656 * in spanning tree or it is in the forwarding state. 1657 */ 1658 1659 /* 1660 * If the packet is unicast, destined for someone on 1661 * "this" side of the bridge, drop it. 1662 */ 1663 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1664 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1665 if (src_if == dst_if) { 1666 m_freem(m); 1667 continue; 1668 } 1669 } else { 1670 /* ...forward it to all interfaces. */ 1671 sc->sc_if.if_imcasts++; 1672 dst_if = NULL; 1673 } 1674 1675 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1676 m->m_pkthdr.rcvif, PFIL_IN) != 0) { 1677 if (m != NULL) 1678 m_freem(m); 1679 continue; 1680 } 1681 if (m == NULL) 1682 continue; 1683 1684 if (dst_if == NULL) { 1685 bridge_broadcast(sc, src_if, m); 1686 continue; 1687 } 1688 1689 /* 1690 * At this point, we're dealing with a unicast frame 1691 * going to a different interface. 1692 */ 1693 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1694 m_freem(m); 1695 continue; 1696 } 1697 1698 bif = bridge_lookup_member_if(sc, dst_if); 1699 if (bif == NULL) { 1700 /* Not a member of the bridge (anymore?) */ 1701 m_freem(m); 1702 continue; 1703 } 1704 1705 if (bif->bif_flags & IFBIF_STP) { 1706 switch (bif->bif_state) { 1707 case BSTP_IFSTATE_DISABLED: 1708 case BSTP_IFSTATE_BLOCKING: 1709 m_freem(m); 1710 bridge_release_member(sc, bif); 1711 continue; 1712 } 1713 } 1714 1715 bridge_release_member(sc, bif); 1716 1717 bridge_enqueue(sc, dst_if, m, 1); 1718 } 1719 #ifndef BRIDGE_MPSAFE 1720 splx(s); 1721 mutex_exit(softnet_lock); 1722 KERNEL_UNLOCK_ONE(NULL); 1723 #endif 1724 } 1725 1726 static bool 1727 bstp_state_before_learning(struct bridge_iflist *bif) 1728 { 1729 if (bif->bif_flags & IFBIF_STP) { 1730 switch (bif->bif_state) { 1731 case BSTP_IFSTATE_BLOCKING: 1732 case BSTP_IFSTATE_LISTENING: 1733 case BSTP_IFSTATE_DISABLED: 1734 return true; 1735 } 1736 } 1737 return false; 1738 } 1739 1740 static bool 1741 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1742 { 1743 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1744 1745 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1746 #if NCARP > 0 1747 || (bif->bif_ifp->if_carp && 1748 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1749 #endif /* NCARP > 0 */ 1750 ) 1751 return true; 1752 1753 return false; 1754 } 1755 1756 /* 1757 * bridge_input: 1758 * 1759 * Receive input from a member interface. Queue the packet for 1760 * bridging if it is not for us. 1761 */ 1762 static void 1763 bridge_input(struct ifnet *ifp, struct mbuf *m) 1764 { 1765 struct bridge_softc *sc = ifp->if_bridge; 1766 struct bridge_iflist *bif; 1767 struct ether_header *eh; 1768 1769 if (__predict_false(sc == NULL) || 1770 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1771 ether_input(ifp, m); 1772 return; 1773 } 1774 1775 bif = bridge_lookup_member_if(sc, ifp); 1776 if (bif == NULL) { 1777 ether_input(ifp, m); 1778 return; 1779 } 1780 1781 eh = mtod(m, struct ether_header *); 1782 1783 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1784 if (memcmp(etherbroadcastaddr, 1785 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1786 m->m_flags |= M_BCAST; 1787 else 1788 m->m_flags |= M_MCAST; 1789 } 1790 1791 /* 1792 * A 'fast' path for packets addressed to interfaces that are 1793 * part of this bridge. 1794 */ 1795 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 1796 !bstp_state_before_learning(bif)) { 1797 struct bridge_iflist *_bif; 1798 1799 BRIDGE_LOCK(sc); 1800 LIST_FOREACH(_bif, &sc->sc_iflist, bif_next) { 1801 /* It is destined for us. */ 1802 if (bridge_ourether(_bif, eh, 0)) { 1803 if (_bif->bif_flags & IFBIF_LEARNING) 1804 (void) bridge_rtupdate(sc, 1805 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1806 m->m_pkthdr.rcvif = _bif->bif_ifp; 1807 ether_input(_bif->bif_ifp, m); 1808 break; 1809 } 1810 1811 /* We just received a packet that we sent out. */ 1812 if (bridge_ourether(_bif, eh, 1)) { 1813 m_freem(m); 1814 break; 1815 } 1816 } 1817 BRIDGE_UNLOCK(sc); 1818 1819 if (_bif != NULL) { 1820 bridge_release_member(sc, bif); 1821 return; 1822 } 1823 } 1824 1825 /* Tap off 802.1D packets; they do not get forwarded. */ 1826 if (bif->bif_flags & IFBIF_STP && 1827 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 1828 bstp_input(sc, bif, m); 1829 bridge_release_member(sc, bif); 1830 return; 1831 } 1832 1833 /* 1834 * A normal switch would discard the packet here, but that's not what 1835 * we've done historically. This also prevents some obnoxious behaviour. 1836 */ 1837 if (bstp_state_before_learning(bif)) { 1838 ether_input(ifp, m); 1839 bridge_release_member(sc, bif); 1840 return; 1841 } 1842 1843 bridge_release_member(sc, bif); 1844 1845 /* Queue the packet for bridge forwarding. */ 1846 if (__predict_false(!pktq_enqueue(sc->sc_fwd_pktq, m, 0))) 1847 m_freem(m); 1848 } 1849 1850 /* 1851 * bridge_broadcast: 1852 * 1853 * Send a frame to all interfaces that are members of 1854 * the bridge, except for the one on which the packet 1855 * arrived. 1856 */ 1857 static void 1858 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1859 struct mbuf *m) 1860 { 1861 struct bridge_iflist *bif; 1862 struct mbuf *mc; 1863 struct ifnet *dst_if; 1864 bool used, bmcast; 1865 1866 used = bmcast = m->m_flags & (M_BCAST|M_MCAST); 1867 1868 BRIDGE_LOCK(sc); 1869 1870 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1871 dst_if = bif->bif_ifp; 1872 if (dst_if == src_if) 1873 continue; 1874 1875 if (bif->bif_flags & IFBIF_STP) { 1876 switch (bif->bif_state) { 1877 case BSTP_IFSTATE_BLOCKING: 1878 case BSTP_IFSTATE_DISABLED: 1879 continue; 1880 } 1881 } 1882 1883 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 1884 continue; 1885 1886 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1887 continue; 1888 1889 if (!used && LIST_NEXT(bif, bif_next) == NULL) { 1890 mc = m; 1891 used = true; 1892 } else { 1893 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1894 if (mc == NULL) { 1895 sc->sc_if.if_oerrors++; 1896 continue; 1897 } 1898 } 1899 1900 bridge_enqueue(sc, dst_if, mc, 1); 1901 } 1902 1903 if (bmcast) 1904 ether_input(src_if, m); 1905 else if (!used) 1906 m_freem(m); 1907 1908 BRIDGE_UNLOCK(sc); 1909 } 1910 1911 /* 1912 * bridge_rtupdate: 1913 * 1914 * Add a bridge routing entry. 1915 */ 1916 static int 1917 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 1918 struct ifnet *dst_if, int setflags, uint8_t flags) 1919 { 1920 struct bridge_rtnode *brt; 1921 int error = 0; 1922 1923 mutex_enter(sc->sc_rtlist_lock); 1924 1925 /* 1926 * A route for this destination might already exist. If so, 1927 * update it, otherwise create a new one. 1928 */ 1929 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) { 1930 if (sc->sc_brtcnt >= sc->sc_brtmax) { 1931 error = ENOSPC; 1932 goto out; 1933 } 1934 1935 /* 1936 * Allocate a new bridge forwarding node, and 1937 * initialize the expiration time and Ethernet 1938 * address. 1939 */ 1940 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 1941 if (brt == NULL) { 1942 error = ENOMEM; 1943 goto out; 1944 } 1945 1946 memset(brt, 0, sizeof(*brt)); 1947 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1948 brt->brt_flags = IFBAF_DYNAMIC; 1949 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 1950 1951 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 1952 pool_put(&bridge_rtnode_pool, brt); 1953 goto out; 1954 } 1955 } 1956 1957 brt->brt_ifp = dst_if; 1958 if (setflags) { 1959 brt->brt_flags = flags; 1960 if (flags & IFBAF_STATIC) 1961 brt->brt_expire = 0; 1962 else 1963 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1964 } 1965 1966 out: 1967 mutex_exit(sc->sc_rtlist_lock); 1968 1969 return error; 1970 } 1971 1972 /* 1973 * bridge_rtlookup: 1974 * 1975 * Lookup the destination interface for an address. 1976 */ 1977 static struct ifnet * 1978 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 1979 { 1980 struct bridge_rtnode *brt; 1981 struct ifnet *ifs = NULL; 1982 1983 mutex_enter(sc->sc_rtlist_lock); 1984 1985 brt = bridge_rtnode_lookup(sc, addr); 1986 if (brt != NULL) 1987 ifs = brt->brt_ifp; 1988 1989 mutex_exit(sc->sc_rtlist_lock); 1990 1991 return ifs; 1992 } 1993 1994 /* 1995 * bridge_rttrim: 1996 * 1997 * Trim the routine table so that we have a number 1998 * of routing entries less than or equal to the 1999 * maximum number. 2000 */ 2001 static void 2002 bridge_rttrim(struct bridge_softc *sc) 2003 { 2004 struct bridge_rtnode *brt, *nbrt; 2005 2006 mutex_enter(sc->sc_rtlist_lock); 2007 2008 /* Make sure we actually need to do this. */ 2009 if (sc->sc_brtcnt <= sc->sc_brtmax) 2010 goto out; 2011 2012 /* Force an aging cycle; this might trim enough addresses. */ 2013 bridge_rtage(sc); 2014 if (sc->sc_brtcnt <= sc->sc_brtmax) 2015 goto out; 2016 2017 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2018 nbrt = LIST_NEXT(brt, brt_list); 2019 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2020 bridge_rtnode_destroy(sc, brt); 2021 if (sc->sc_brtcnt <= sc->sc_brtmax) 2022 goto out; 2023 } 2024 } 2025 2026 out: 2027 mutex_exit(sc->sc_rtlist_lock); 2028 2029 return; 2030 } 2031 2032 /* 2033 * bridge_timer: 2034 * 2035 * Aging timer for the bridge. 2036 */ 2037 static void 2038 bridge_timer(void *arg) 2039 { 2040 struct bridge_softc *sc = arg; 2041 2042 mutex_enter(sc->sc_rtlist_lock); 2043 2044 bridge_rtage(sc); 2045 2046 if (sc->sc_if.if_flags & IFF_RUNNING) 2047 callout_reset(&sc->sc_brcallout, 2048 bridge_rtable_prune_period * hz, bridge_timer, sc); 2049 2050 mutex_exit(sc->sc_rtlist_lock); 2051 } 2052 2053 /* 2054 * bridge_rtage: 2055 * 2056 * Perform an aging cycle. 2057 */ 2058 static void 2059 bridge_rtage(struct bridge_softc *sc) 2060 { 2061 struct bridge_rtnode *brt, *nbrt; 2062 2063 KASSERT(mutex_owned(sc->sc_rtlist_lock)); 2064 2065 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2066 nbrt = LIST_NEXT(brt, brt_list); 2067 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2068 if (time_uptime >= brt->brt_expire) 2069 bridge_rtnode_destroy(sc, brt); 2070 } 2071 } 2072 } 2073 2074 /* 2075 * bridge_rtflush: 2076 * 2077 * Remove all dynamic addresses from the bridge. 2078 */ 2079 static void 2080 bridge_rtflush(struct bridge_softc *sc, int full) 2081 { 2082 struct bridge_rtnode *brt, *nbrt; 2083 2084 mutex_enter(sc->sc_rtlist_lock); 2085 2086 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2087 nbrt = LIST_NEXT(brt, brt_list); 2088 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2089 bridge_rtnode_destroy(sc, brt); 2090 } 2091 2092 mutex_exit(sc->sc_rtlist_lock); 2093 } 2094 2095 /* 2096 * bridge_rtdaddr: 2097 * 2098 * Remove an address from the table. 2099 */ 2100 static int 2101 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2102 { 2103 struct bridge_rtnode *brt; 2104 int error = 0; 2105 2106 mutex_enter(sc->sc_rtlist_lock); 2107 2108 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2109 error = ENOENT; 2110 goto out; 2111 } 2112 2113 bridge_rtnode_destroy(sc, brt); 2114 2115 out: 2116 mutex_exit(sc->sc_rtlist_lock); 2117 2118 return error; 2119 } 2120 2121 /* 2122 * bridge_rtdelete: 2123 * 2124 * Delete routes to a speicifc member interface. 2125 */ 2126 static void 2127 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2128 { 2129 struct bridge_rtnode *brt, *nbrt; 2130 2131 mutex_enter(sc->sc_rtlist_lock); 2132 2133 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2134 nbrt = LIST_NEXT(brt, brt_list); 2135 if (brt->brt_ifp == ifp) 2136 bridge_rtnode_destroy(sc, brt); 2137 } 2138 2139 mutex_exit(sc->sc_rtlist_lock); 2140 } 2141 2142 /* 2143 * bridge_rtable_init: 2144 * 2145 * Initialize the route table for this bridge. 2146 */ 2147 static int 2148 bridge_rtable_init(struct bridge_softc *sc) 2149 { 2150 int i; 2151 2152 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2153 M_DEVBUF, M_NOWAIT); 2154 if (sc->sc_rthash == NULL) 2155 return (ENOMEM); 2156 2157 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2158 LIST_INIT(&sc->sc_rthash[i]); 2159 2160 sc->sc_rthash_key = cprng_fast32(); 2161 2162 LIST_INIT(&sc->sc_rtlist); 2163 2164 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NET); 2165 2166 return (0); 2167 } 2168 2169 /* 2170 * bridge_rtable_fini: 2171 * 2172 * Deconstruct the route table for this bridge. 2173 */ 2174 static void 2175 bridge_rtable_fini(struct bridge_softc *sc) 2176 { 2177 2178 free(sc->sc_rthash, M_DEVBUF); 2179 if (sc->sc_rtlist_lock) 2180 mutex_obj_free(sc->sc_rtlist_lock); 2181 } 2182 2183 /* 2184 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2185 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2186 */ 2187 #define mix(a, b, c) \ 2188 do { \ 2189 a -= b; a -= c; a ^= (c >> 13); \ 2190 b -= c; b -= a; b ^= (a << 8); \ 2191 c -= a; c -= b; c ^= (b >> 13); \ 2192 a -= b; a -= c; a ^= (c >> 12); \ 2193 b -= c; b -= a; b ^= (a << 16); \ 2194 c -= a; c -= b; c ^= (b >> 5); \ 2195 a -= b; a -= c; a ^= (c >> 3); \ 2196 b -= c; b -= a; b ^= (a << 10); \ 2197 c -= a; c -= b; c ^= (b >> 15); \ 2198 } while (/*CONSTCOND*/0) 2199 2200 static inline uint32_t 2201 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2202 { 2203 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2204 2205 b += addr[5] << 8; 2206 b += addr[4]; 2207 a += addr[3] << 24; 2208 a += addr[2] << 16; 2209 a += addr[1] << 8; 2210 a += addr[0]; 2211 2212 mix(a, b, c); 2213 2214 return (c & BRIDGE_RTHASH_MASK); 2215 } 2216 2217 #undef mix 2218 2219 /* 2220 * bridge_rtnode_lookup: 2221 * 2222 * Look up a bridge route node for the specified destination. 2223 */ 2224 static struct bridge_rtnode * 2225 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2226 { 2227 struct bridge_rtnode *brt; 2228 uint32_t hash; 2229 int dir; 2230 2231 KASSERT(mutex_owned(sc->sc_rtlist_lock)); 2232 2233 hash = bridge_rthash(sc, addr); 2234 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2235 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2236 if (dir == 0) 2237 return (brt); 2238 if (dir > 0) 2239 return (NULL); 2240 } 2241 2242 return (NULL); 2243 } 2244 2245 /* 2246 * bridge_rtnode_insert: 2247 * 2248 * Insert the specified bridge node into the route table. We 2249 * assume the entry is not already in the table. 2250 */ 2251 static int 2252 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2253 { 2254 struct bridge_rtnode *lbrt; 2255 uint32_t hash; 2256 int dir; 2257 2258 KASSERT(mutex_owned(sc->sc_rtlist_lock)); 2259 2260 hash = bridge_rthash(sc, brt->brt_addr); 2261 2262 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2263 if (lbrt == NULL) { 2264 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2265 goto out; 2266 } 2267 2268 do { 2269 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2270 if (dir == 0) 2271 return (EEXIST); 2272 if (dir > 0) { 2273 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2274 goto out; 2275 } 2276 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2277 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2278 goto out; 2279 } 2280 lbrt = LIST_NEXT(lbrt, brt_hash); 2281 } while (lbrt != NULL); 2282 2283 #ifdef DIAGNOSTIC 2284 panic("bridge_rtnode_insert: impossible"); 2285 #endif 2286 2287 out: 2288 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2289 sc->sc_brtcnt++; 2290 2291 return (0); 2292 } 2293 2294 /* 2295 * bridge_rtnode_destroy: 2296 * 2297 * Destroy a bridge rtnode. 2298 */ 2299 static void 2300 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2301 { 2302 2303 KASSERT(mutex_owned(sc->sc_rtlist_lock)); 2304 2305 LIST_REMOVE(brt, brt_hash); 2306 2307 LIST_REMOVE(brt, brt_list); 2308 sc->sc_brtcnt--; 2309 pool_put(&bridge_rtnode_pool, brt); 2310 } 2311 2312 #if defined(BRIDGE_IPF) 2313 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2314 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2315 2316 /* 2317 * Send bridge packets through IPF if they are one of the types IPF can deal 2318 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2319 * question.) 2320 */ 2321 static int 2322 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2323 { 2324 int snap, error; 2325 struct ether_header *eh1, eh2; 2326 struct llc llc1; 2327 uint16_t ether_type; 2328 2329 snap = 0; 2330 error = -1; /* Default error if not error == 0 */ 2331 eh1 = mtod(*mp, struct ether_header *); 2332 ether_type = ntohs(eh1->ether_type); 2333 2334 /* 2335 * Check for SNAP/LLC. 2336 */ 2337 if (ether_type < ETHERMTU) { 2338 struct llc *llc2 = (struct llc *)(eh1 + 1); 2339 2340 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2341 llc2->llc_dsap == LLC_SNAP_LSAP && 2342 llc2->llc_ssap == LLC_SNAP_LSAP && 2343 llc2->llc_control == LLC_UI) { 2344 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2345 snap = 1; 2346 } 2347 } 2348 2349 /* 2350 * If we're trying to filter bridge traffic, don't look at anything 2351 * other than IP and ARP traffic. If the filter doesn't understand 2352 * IPv6, don't allow IPv6 through the bridge either. This is lame 2353 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2354 * but of course we don't have an AppleTalk filter to begin with. 2355 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2356 * ARP traffic.) 2357 */ 2358 switch (ether_type) { 2359 case ETHERTYPE_ARP: 2360 case ETHERTYPE_REVARP: 2361 return 0; /* Automatically pass */ 2362 case ETHERTYPE_IP: 2363 # ifdef INET6 2364 case ETHERTYPE_IPV6: 2365 # endif /* INET6 */ 2366 break; 2367 default: 2368 goto bad; 2369 } 2370 2371 /* Strip off the Ethernet header and keep a copy. */ 2372 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2373 m_adj(*mp, ETHER_HDR_LEN); 2374 2375 /* Strip off snap header, if present */ 2376 if (snap) { 2377 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2378 m_adj(*mp, sizeof(struct llc)); 2379 } 2380 2381 /* 2382 * Check basic packet sanity and run IPF through pfil. 2383 */ 2384 KASSERT(!cpu_intr_p()); 2385 switch (ether_type) 2386 { 2387 case ETHERTYPE_IP : 2388 error = (dir == PFIL_IN) ? bridge_ip_checkbasic(mp) : 0; 2389 if (error == 0) 2390 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2391 break; 2392 # ifdef INET6 2393 case ETHERTYPE_IPV6 : 2394 error = (dir == PFIL_IN) ? bridge_ip6_checkbasic(mp) : 0; 2395 if (error == 0) 2396 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2397 break; 2398 # endif 2399 default : 2400 error = 0; 2401 break; 2402 } 2403 2404 if (*mp == NULL) 2405 return error; 2406 if (error != 0) 2407 goto bad; 2408 2409 error = -1; 2410 2411 /* 2412 * Finally, put everything back the way it was and return 2413 */ 2414 if (snap) { 2415 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2416 if (*mp == NULL) 2417 return error; 2418 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2419 } 2420 2421 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2422 if (*mp == NULL) 2423 return error; 2424 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2425 2426 return 0; 2427 2428 bad: 2429 m_freem(*mp); 2430 *mp = NULL; 2431 return error; 2432 } 2433 2434 /* 2435 * Perform basic checks on header size since 2436 * IPF assumes ip_input has already processed 2437 * it for it. Cut-and-pasted from ip_input.c. 2438 * Given how simple the IPv6 version is, 2439 * does the IPv4 version really need to be 2440 * this complicated? 2441 * 2442 * XXX Should we update ipstat here, or not? 2443 * XXX Right now we update ipstat but not 2444 * XXX csum_counter. 2445 */ 2446 static int 2447 bridge_ip_checkbasic(struct mbuf **mp) 2448 { 2449 struct mbuf *m = *mp; 2450 struct ip *ip; 2451 int len, hlen; 2452 2453 if (*mp == NULL) 2454 return -1; 2455 2456 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2457 if ((m = m_copyup(m, sizeof(struct ip), 2458 (max_linkhdr + 3) & ~3)) == NULL) { 2459 /* XXXJRT new stat, please */ 2460 ip_statinc(IP_STAT_TOOSMALL); 2461 goto bad; 2462 } 2463 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2464 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2465 ip_statinc(IP_STAT_TOOSMALL); 2466 goto bad; 2467 } 2468 } 2469 ip = mtod(m, struct ip *); 2470 if (ip == NULL) goto bad; 2471 2472 if (ip->ip_v != IPVERSION) { 2473 ip_statinc(IP_STAT_BADVERS); 2474 goto bad; 2475 } 2476 hlen = ip->ip_hl << 2; 2477 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2478 ip_statinc(IP_STAT_BADHLEN); 2479 goto bad; 2480 } 2481 if (hlen > m->m_len) { 2482 if ((m = m_pullup(m, hlen)) == 0) { 2483 ip_statinc(IP_STAT_BADHLEN); 2484 goto bad; 2485 } 2486 ip = mtod(m, struct ip *); 2487 if (ip == NULL) goto bad; 2488 } 2489 2490 switch (m->m_pkthdr.csum_flags & 2491 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 2492 M_CSUM_IPv4_BAD)) { 2493 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2494 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2495 goto bad; 2496 2497 case M_CSUM_IPv4: 2498 /* Checksum was okay. */ 2499 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2500 break; 2501 2502 default: 2503 /* Must compute it ourselves. */ 2504 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2505 if (in_cksum(m, hlen) != 0) 2506 goto bad; 2507 break; 2508 } 2509 2510 /* Retrieve the packet length. */ 2511 len = ntohs(ip->ip_len); 2512 2513 /* 2514 * Check for additional length bogosity 2515 */ 2516 if (len < hlen) { 2517 ip_statinc(IP_STAT_BADLEN); 2518 goto bad; 2519 } 2520 2521 /* 2522 * Check that the amount of data in the buffers 2523 * is as at least much as the IP header would have us expect. 2524 * Drop packet if shorter than we expect. 2525 */ 2526 if (m->m_pkthdr.len < len) { 2527 ip_statinc(IP_STAT_TOOSHORT); 2528 goto bad; 2529 } 2530 2531 /* Checks out, proceed */ 2532 *mp = m; 2533 return 0; 2534 2535 bad: 2536 *mp = m; 2537 return -1; 2538 } 2539 2540 # ifdef INET6 2541 /* 2542 * Same as above, but for IPv6. 2543 * Cut-and-pasted from ip6_input.c. 2544 * XXX Should we update ip6stat, or not? 2545 */ 2546 static int 2547 bridge_ip6_checkbasic(struct mbuf **mp) 2548 { 2549 struct mbuf *m = *mp; 2550 struct ip6_hdr *ip6; 2551 2552 /* 2553 * If the IPv6 header is not aligned, slurp it up into a new 2554 * mbuf with space for link headers, in the event we forward 2555 * it. Otherwise, if it is aligned, make sure the entire base 2556 * IPv6 header is in the first mbuf of the chain. 2557 */ 2558 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2559 struct ifnet *inifp = m->m_pkthdr.rcvif; 2560 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2561 (max_linkhdr + 3) & ~3)) == NULL) { 2562 /* XXXJRT new stat, please */ 2563 ip6_statinc(IP6_STAT_TOOSMALL); 2564 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2565 goto bad; 2566 } 2567 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2568 struct ifnet *inifp = m->m_pkthdr.rcvif; 2569 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2570 ip6_statinc(IP6_STAT_TOOSMALL); 2571 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2572 goto bad; 2573 } 2574 } 2575 2576 ip6 = mtod(m, struct ip6_hdr *); 2577 2578 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2579 ip6_statinc(IP6_STAT_BADVERS); 2580 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 2581 goto bad; 2582 } 2583 2584 /* Checks out, proceed */ 2585 *mp = m; 2586 return 0; 2587 2588 bad: 2589 *mp = m; 2590 return -1; 2591 } 2592 # endif /* INET6 */ 2593 #endif /* BRIDGE_IPF */ 2594
Indexes created Mon Sep 22 13:09:51 GMT 2025