if_bridge.c revision 1.90.2.1
1 /* $NetBSD: if_bridge.c,v 1.90.2.1 2017/09/24 20:05:03 snj 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 1.90.2.1 2017/09/24 20:05:03 snj 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 if ((error = ether_enable_vlan_mtu(ifs)) > 0) 810 goto out; 811 /* 812 * Place the interface into promiscuous mode. 813 */ 814 error = ifpromisc(ifs, 1); 815 if (error) 816 goto out; 817 break; 818 default: 819 error = EINVAL; 820 goto out; 821 } 822 823 bif->bif_ifp = ifs; 824 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 825 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 826 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 827 bif->bif_refs = 0; 828 bif->bif_waiting = false; 829 830 BRIDGE_LOCK(sc); 831 832 ifs->if_bridge = sc; 833 ifs->if_bridgeif = bif; 834 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 835 ifs->if_input = bridge_input; 836 837 BRIDGE_UNLOCK(sc); 838 839 if (sc->sc_if.if_flags & IFF_RUNNING) 840 bstp_initialization(sc); 841 else 842 bstp_stop(sc); 843 844 out: 845 if (error) { 846 if (bif != NULL) 847 free(bif, M_DEVBUF); 848 } 849 return (error); 850 } 851 852 static int 853 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 854 { 855 struct ifbreq *req = arg; 856 const char *name = req->ifbr_ifsname; 857 struct bridge_iflist *bif; 858 struct ifnet *ifs; 859 860 BRIDGE_LOCK(sc); 861 862 /* 863 * Don't use bridge_lookup_member. We want to get a member 864 * with bif_refs == 0. 865 */ 866 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 867 ifs = bif->bif_ifp; 868 if (strcmp(ifs->if_xname, name) == 0) 869 break; 870 } 871 872 if (bif == NULL) { 873 BRIDGE_UNLOCK(sc); 874 return ENOENT; 875 } 876 877 bridge_delete_member(sc, bif); 878 879 BRIDGE_UNLOCK(sc); 880 881 switch (ifs->if_type) { 882 case IFT_ETHER: 883 /* 884 * Take the interface out of promiscuous mode. 885 * Don't call it with holding sc_iflist_lock. 886 */ 887 (void) ifpromisc(ifs, 0); 888 (void) ether_disable_vlan_mtu(ifs); 889 break; 890 default: 891 #ifdef DIAGNOSTIC 892 panic("bridge_delete_member: impossible"); 893 #endif 894 break; 895 } 896 897 bridge_rtdelete(sc, ifs); 898 899 if (sc->sc_if.if_flags & IFF_RUNNING) 900 bstp_initialization(sc); 901 902 return 0; 903 } 904 905 static int 906 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 907 { 908 struct ifbreq *req = arg; 909 struct bridge_iflist *bif; 910 911 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 912 if (bif == NULL) 913 return (ENOENT); 914 915 req->ifbr_ifsflags = bif->bif_flags; 916 req->ifbr_state = bif->bif_state; 917 req->ifbr_priority = bif->bif_priority; 918 req->ifbr_path_cost = bif->bif_path_cost; 919 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 920 921 bridge_release_member(sc, bif); 922 923 return (0); 924 } 925 926 static int 927 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 928 { 929 struct ifbreq *req = arg; 930 struct bridge_iflist *bif; 931 932 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 933 if (bif == NULL) 934 return (ENOENT); 935 936 if (req->ifbr_ifsflags & IFBIF_STP) { 937 switch (bif->bif_ifp->if_type) { 938 case IFT_ETHER: 939 /* These can do spanning tree. */ 940 break; 941 942 default: 943 /* Nothing else can. */ 944 bridge_release_member(sc, bif); 945 return (EINVAL); 946 } 947 } 948 949 bif->bif_flags = req->ifbr_ifsflags; 950 951 bridge_release_member(sc, bif); 952 953 if (sc->sc_if.if_flags & IFF_RUNNING) 954 bstp_initialization(sc); 955 956 return (0); 957 } 958 959 static int 960 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 961 { 962 struct ifbrparam *param = arg; 963 964 sc->sc_brtmax = param->ifbrp_csize; 965 bridge_rttrim(sc); 966 967 return (0); 968 } 969 970 static int 971 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 972 { 973 struct ifbrparam *param = arg; 974 975 param->ifbrp_csize = sc->sc_brtmax; 976 977 return (0); 978 } 979 980 static int 981 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 982 { 983 struct ifbifconf *bifc = arg; 984 struct bridge_iflist *bif; 985 struct ifbreq *breqs; 986 int i, count, error = 0; 987 988 BRIDGE_LOCK(sc); 989 990 count = 0; 991 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 992 count++; 993 994 if (bifc->ifbic_len == 0 || bifc->ifbic_len < (sizeof(*breqs) * count)) { 995 BRIDGE_UNLOCK(sc); 996 /* Tell that a larger buffer is needed */ 997 bifc->ifbic_len = sizeof(*breqs) * count; 998 return 0; 999 } 1000 1001 breqs = malloc(sizeof(*breqs) * count, M_DEVBUF, M_NOWAIT); 1002 1003 i = 0; 1004 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1005 struct ifbreq *breq = &breqs[i++]; 1006 memset(breq, 0, sizeof(*breq)); 1007 1008 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, 1009 sizeof(breq->ifbr_ifsname)); 1010 breq->ifbr_ifsflags = bif->bif_flags; 1011 breq->ifbr_state = bif->bif_state; 1012 breq->ifbr_priority = bif->bif_priority; 1013 breq->ifbr_path_cost = bif->bif_path_cost; 1014 breq->ifbr_portno = bif->bif_ifp->if_index & 0xff; 1015 } 1016 1017 /* Don't call copyout with holding the mutex */ 1018 BRIDGE_UNLOCK(sc); 1019 1020 for (i = 0; i < count; i++) { 1021 error = copyout(&breqs[i], bifc->ifbic_req + i, sizeof(*breqs)); 1022 if (error) 1023 break; 1024 } 1025 bifc->ifbic_len = sizeof(*breqs) * i; 1026 1027 free(breqs, M_DEVBUF); 1028 1029 return error; 1030 } 1031 1032 static int 1033 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1034 { 1035 struct ifbaconf *bac = arg; 1036 struct bridge_rtnode *brt; 1037 struct ifbareq bareq; 1038 int count = 0, error = 0, len; 1039 1040 if (bac->ifbac_len == 0) 1041 return (0); 1042 1043 mutex_enter(sc->sc_rtlist_lock); 1044 1045 len = bac->ifbac_len; 1046 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1047 if (len < sizeof(bareq)) 1048 goto out; 1049 memset(&bareq, 0, sizeof(bareq)); 1050 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1051 sizeof(bareq.ifba_ifsname)); 1052 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1053 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1054 bareq.ifba_expire = brt->brt_expire - time_uptime; 1055 } else 1056 bareq.ifba_expire = 0; 1057 bareq.ifba_flags = brt->brt_flags; 1058 1059 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1060 if (error) 1061 goto out; 1062 count++; 1063 len -= sizeof(bareq); 1064 } 1065 out: 1066 mutex_exit(sc->sc_rtlist_lock); 1067 1068 bac->ifbac_len = sizeof(bareq) * count; 1069 return (error); 1070 } 1071 1072 static int 1073 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1074 { 1075 struct ifbareq *req = arg; 1076 struct bridge_iflist *bif; 1077 int error; 1078 1079 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1080 if (bif == NULL) 1081 return (ENOENT); 1082 1083 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1084 req->ifba_flags); 1085 1086 bridge_release_member(sc, bif); 1087 1088 return (error); 1089 } 1090 1091 static int 1092 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1093 { 1094 struct ifbrparam *param = arg; 1095 1096 sc->sc_brttimeout = param->ifbrp_ctime; 1097 1098 return (0); 1099 } 1100 1101 static int 1102 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1103 { 1104 struct ifbrparam *param = arg; 1105 1106 param->ifbrp_ctime = sc->sc_brttimeout; 1107 1108 return (0); 1109 } 1110 1111 static int 1112 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1113 { 1114 struct ifbareq *req = arg; 1115 1116 return (bridge_rtdaddr(sc, req->ifba_dst)); 1117 } 1118 1119 static int 1120 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1121 { 1122 struct ifbreq *req = arg; 1123 1124 bridge_rtflush(sc, req->ifbr_ifsflags); 1125 1126 return (0); 1127 } 1128 1129 static int 1130 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1131 { 1132 struct ifbrparam *param = arg; 1133 1134 param->ifbrp_prio = sc->sc_bridge_priority; 1135 1136 return (0); 1137 } 1138 1139 static int 1140 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1141 { 1142 struct ifbrparam *param = arg; 1143 1144 sc->sc_bridge_priority = param->ifbrp_prio; 1145 1146 if (sc->sc_if.if_flags & IFF_RUNNING) 1147 bstp_initialization(sc); 1148 1149 return (0); 1150 } 1151 1152 static int 1153 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1154 { 1155 struct ifbrparam *param = arg; 1156 1157 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1158 1159 return (0); 1160 } 1161 1162 static int 1163 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1164 { 1165 struct ifbrparam *param = arg; 1166 1167 if (param->ifbrp_hellotime == 0) 1168 return (EINVAL); 1169 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1170 1171 if (sc->sc_if.if_flags & IFF_RUNNING) 1172 bstp_initialization(sc); 1173 1174 return (0); 1175 } 1176 1177 static int 1178 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1179 { 1180 struct ifbrparam *param = arg; 1181 1182 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1183 1184 return (0); 1185 } 1186 1187 static int 1188 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1189 { 1190 struct ifbrparam *param = arg; 1191 1192 if (param->ifbrp_fwddelay == 0) 1193 return (EINVAL); 1194 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1195 1196 if (sc->sc_if.if_flags & IFF_RUNNING) 1197 bstp_initialization(sc); 1198 1199 return (0); 1200 } 1201 1202 static int 1203 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1204 { 1205 struct ifbrparam *param = arg; 1206 1207 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1208 1209 return (0); 1210 } 1211 1212 static int 1213 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1214 { 1215 struct ifbrparam *param = arg; 1216 1217 if (param->ifbrp_maxage == 0) 1218 return (EINVAL); 1219 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1220 1221 if (sc->sc_if.if_flags & IFF_RUNNING) 1222 bstp_initialization(sc); 1223 1224 return (0); 1225 } 1226 1227 static int 1228 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1229 { 1230 struct ifbreq *req = arg; 1231 struct bridge_iflist *bif; 1232 1233 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1234 if (bif == NULL) 1235 return (ENOENT); 1236 1237 bif->bif_priority = req->ifbr_priority; 1238 1239 if (sc->sc_if.if_flags & IFF_RUNNING) 1240 bstp_initialization(sc); 1241 1242 bridge_release_member(sc, bif); 1243 1244 return (0); 1245 } 1246 1247 #if defined(BRIDGE_IPF) 1248 static int 1249 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1250 { 1251 struct ifbrparam *param = arg; 1252 1253 param->ifbrp_filter = sc->sc_filter_flags; 1254 1255 return (0); 1256 } 1257 1258 static int 1259 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1260 { 1261 struct ifbrparam *param = arg; 1262 uint32_t nflags, oflags; 1263 1264 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1265 return (EINVAL); 1266 1267 nflags = param->ifbrp_filter; 1268 oflags = sc->sc_filter_flags; 1269 1270 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1271 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1272 sc->sc_if.if_pfil); 1273 } 1274 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1275 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1276 sc->sc_if.if_pfil); 1277 } 1278 1279 sc->sc_filter_flags = nflags; 1280 1281 return (0); 1282 } 1283 #endif /* BRIDGE_IPF */ 1284 1285 static int 1286 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1287 { 1288 struct ifbreq *req = arg; 1289 struct bridge_iflist *bif; 1290 1291 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1292 if (bif == NULL) 1293 return (ENOENT); 1294 1295 bif->bif_path_cost = req->ifbr_path_cost; 1296 1297 if (sc->sc_if.if_flags & IFF_RUNNING) 1298 bstp_initialization(sc); 1299 1300 bridge_release_member(sc, bif); 1301 1302 return (0); 1303 } 1304 1305 /* 1306 * bridge_ifdetach: 1307 * 1308 * Detach an interface from a bridge. Called when a member 1309 * interface is detaching. 1310 */ 1311 void 1312 bridge_ifdetach(struct ifnet *ifp) 1313 { 1314 struct bridge_softc *sc = ifp->if_bridge; 1315 struct ifbreq breq; 1316 1317 /* ioctl_lock should prevent this from happening */ 1318 KASSERT(sc != NULL); 1319 1320 memset(&breq, 0, sizeof(breq)); 1321 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1322 1323 (void) bridge_ioctl_del(sc, &breq); 1324 } 1325 1326 /* 1327 * bridge_init: 1328 * 1329 * Initialize a bridge interface. 1330 */ 1331 static int 1332 bridge_init(struct ifnet *ifp) 1333 { 1334 struct bridge_softc *sc = ifp->if_softc; 1335 1336 if (ifp->if_flags & IFF_RUNNING) 1337 return (0); 1338 1339 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1340 bridge_timer, sc); 1341 1342 ifp->if_flags |= IFF_RUNNING; 1343 bstp_initialization(sc); 1344 return (0); 1345 } 1346 1347 /* 1348 * bridge_stop: 1349 * 1350 * Stop the bridge interface. 1351 */ 1352 static void 1353 bridge_stop(struct ifnet *ifp, int disable) 1354 { 1355 struct bridge_softc *sc = ifp->if_softc; 1356 1357 if ((ifp->if_flags & IFF_RUNNING) == 0) 1358 return; 1359 1360 callout_stop(&sc->sc_brcallout); 1361 bstp_stop(sc); 1362 1363 bridge_rtflush(sc, IFBF_FLUSHDYN); 1364 1365 ifp->if_flags &= ~IFF_RUNNING; 1366 } 1367 1368 /* 1369 * bridge_enqueue: 1370 * 1371 * Enqueue a packet on a bridge member interface. 1372 */ 1373 void 1374 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1375 int runfilt) 1376 { 1377 ALTQ_DECL(struct altq_pktattr pktattr;) 1378 int len, error; 1379 short mflags; 1380 1381 /* 1382 * Clear any in-bound checksum flags for this packet. 1383 */ 1384 m->m_pkthdr.csum_flags = 0; 1385 1386 if (runfilt) { 1387 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1388 dst_ifp, PFIL_OUT) != 0) { 1389 if (m != NULL) 1390 m_freem(m); 1391 return; 1392 } 1393 if (m == NULL) 1394 return; 1395 } 1396 1397 #ifdef ALTQ 1398 /* 1399 * If ALTQ is enabled on the member interface, do 1400 * classification; the queueing discipline might 1401 * not require classification, but might require 1402 * the address family/header pointer in the pktattr. 1403 */ 1404 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1405 /* XXX IFT_ETHER */ 1406 altq_etherclassify(&dst_ifp->if_snd, m, &pktattr); 1407 } 1408 #endif /* ALTQ */ 1409 1410 len = m->m_pkthdr.len; 1411 m->m_flags |= M_PROTO1; 1412 mflags = m->m_flags; 1413 1414 IFQ_ENQUEUE(&dst_ifp->if_snd, m, &pktattr, error); 1415 1416 if (error) { 1417 /* mbuf is already freed */ 1418 sc->sc_if.if_oerrors++; 1419 return; 1420 } 1421 1422 sc->sc_if.if_opackets++; 1423 sc->sc_if.if_obytes += len; 1424 1425 dst_ifp->if_obytes += len; 1426 1427 if (mflags & M_MCAST) { 1428 sc->sc_if.if_omcasts++; 1429 dst_ifp->if_omcasts++; 1430 } 1431 1432 if ((dst_ifp->if_flags & IFF_OACTIVE) == 0) 1433 (*dst_ifp->if_start)(dst_ifp); 1434 } 1435 1436 /* 1437 * bridge_output: 1438 * 1439 * Send output from a bridge member interface. This 1440 * performs the bridging function for locally originated 1441 * packets. 1442 * 1443 * The mbuf has the Ethernet header already attached. We must 1444 * enqueue or free the mbuf before returning. 1445 */ 1446 int 1447 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1448 struct rtentry *rt) 1449 { 1450 struct ether_header *eh; 1451 struct ifnet *dst_if; 1452 struct bridge_softc *sc; 1453 #ifndef BRIDGE_MPSAFE 1454 int s; 1455 #endif 1456 1457 if (m->m_len < ETHER_HDR_LEN) { 1458 m = m_pullup(m, ETHER_HDR_LEN); 1459 if (m == NULL) 1460 return (0); 1461 } 1462 1463 eh = mtod(m, struct ether_header *); 1464 sc = ifp->if_bridge; 1465 1466 #ifndef BRIDGE_MPSAFE 1467 s = splnet(); 1468 #endif 1469 1470 /* 1471 * If bridge is down, but the original output interface is up, 1472 * go ahead and send out that interface. Otherwise, the packet 1473 * is dropped below. 1474 */ 1475 if (__predict_false(sc == NULL) || 1476 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1477 dst_if = ifp; 1478 goto sendunicast; 1479 } 1480 1481 /* 1482 * If the packet is a multicast, or we don't know a better way to 1483 * get there, send to all interfaces. 1484 */ 1485 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1486 dst_if = NULL; 1487 else 1488 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1489 if (dst_if == NULL) { 1490 struct bridge_iflist *bif; 1491 struct mbuf *mc; 1492 int used = 0; 1493 1494 BRIDGE_LOCK(sc); 1495 1496 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1497 dst_if = bif->bif_ifp; 1498 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1499 continue; 1500 1501 /* 1502 * If this is not the original output interface, 1503 * and the interface is participating in spanning 1504 * tree, make sure the port is in a state that 1505 * allows forwarding. 1506 */ 1507 if (dst_if != ifp && 1508 (bif->bif_flags & IFBIF_STP) != 0) { 1509 switch (bif->bif_state) { 1510 case BSTP_IFSTATE_BLOCKING: 1511 case BSTP_IFSTATE_LISTENING: 1512 case BSTP_IFSTATE_DISABLED: 1513 continue; 1514 } 1515 } 1516 1517 if (LIST_NEXT(bif, bif_next) == NULL) { 1518 used = 1; 1519 mc = m; 1520 } else { 1521 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1522 if (mc == NULL) { 1523 sc->sc_if.if_oerrors++; 1524 continue; 1525 } 1526 } 1527 1528 bridge_enqueue(sc, dst_if, mc, 0); 1529 } 1530 1531 BRIDGE_UNLOCK(sc); 1532 1533 if (used == 0) 1534 m_freem(m); 1535 #ifndef BRIDGE_MPSAFE 1536 splx(s); 1537 #endif 1538 return (0); 1539 } 1540 1541 sendunicast: 1542 /* 1543 * XXX Spanning tree consideration here? 1544 */ 1545 1546 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1547 m_freem(m); 1548 #ifndef BRIDGE_MPSAFE 1549 splx(s); 1550 #endif 1551 return (0); 1552 } 1553 1554 bridge_enqueue(sc, dst_if, m, 0); 1555 1556 #ifndef BRIDGE_MPSAFE 1557 splx(s); 1558 #endif 1559 return (0); 1560 } 1561 1562 /* 1563 * bridge_start: 1564 * 1565 * Start output on a bridge. 1566 * 1567 * NOTE: This routine should never be called in this implementation. 1568 */ 1569 static void 1570 bridge_start(struct ifnet *ifp) 1571 { 1572 1573 printf("%s: bridge_start() called\n", ifp->if_xname); 1574 } 1575 1576 /* 1577 * bridge_forward: 1578 * 1579 * The forwarding function of the bridge. 1580 */ 1581 static void 1582 bridge_forward(void *v) 1583 { 1584 struct bridge_softc *sc = v; 1585 struct mbuf *m; 1586 struct bridge_iflist *bif; 1587 struct ifnet *src_if, *dst_if; 1588 struct ether_header *eh; 1589 #ifndef BRIDGE_MPSAFE 1590 int s; 1591 1592 KERNEL_LOCK(1, NULL); 1593 mutex_enter(softnet_lock); 1594 #endif 1595 1596 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1597 #ifndef BRIDGE_MPSAFE 1598 mutex_exit(softnet_lock); 1599 KERNEL_UNLOCK_ONE(NULL); 1600 #endif 1601 return; 1602 } 1603 1604 #ifndef BRIDGE_MPSAFE 1605 s = splnet(); 1606 #endif 1607 while ((m = pktq_dequeue(sc->sc_fwd_pktq)) != NULL) { 1608 src_if = m->m_pkthdr.rcvif; 1609 1610 sc->sc_if.if_ipackets++; 1611 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1612 1613 /* 1614 * Look up the bridge_iflist. 1615 */ 1616 bif = bridge_lookup_member_if(sc, src_if); 1617 if (bif == NULL) { 1618 /* Interface is not a bridge member (anymore?) */ 1619 m_freem(m); 1620 continue; 1621 } 1622 1623 if (bif->bif_flags & IFBIF_STP) { 1624 switch (bif->bif_state) { 1625 case BSTP_IFSTATE_BLOCKING: 1626 case BSTP_IFSTATE_LISTENING: 1627 case BSTP_IFSTATE_DISABLED: 1628 m_freem(m); 1629 bridge_release_member(sc, bif); 1630 continue; 1631 } 1632 } 1633 1634 eh = mtod(m, struct ether_header *); 1635 1636 /* 1637 * If the interface is learning, and the source 1638 * address is valid and not multicast, record 1639 * the address. 1640 */ 1641 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1642 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1643 (eh->ether_shost[0] == 0 && 1644 eh->ether_shost[1] == 0 && 1645 eh->ether_shost[2] == 0 && 1646 eh->ether_shost[3] == 0 && 1647 eh->ether_shost[4] == 0 && 1648 eh->ether_shost[5] == 0) == 0) { 1649 (void) bridge_rtupdate(sc, eh->ether_shost, 1650 src_if, 0, IFBAF_DYNAMIC); 1651 } 1652 1653 if ((bif->bif_flags & IFBIF_STP) != 0 && 1654 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1655 m_freem(m); 1656 bridge_release_member(sc, bif); 1657 continue; 1658 } 1659 1660 bridge_release_member(sc, bif); 1661 1662 /* 1663 * At this point, the port either doesn't participate 1664 * in spanning tree or it is in the forwarding state. 1665 */ 1666 1667 /* 1668 * If the packet is unicast, destined for someone on 1669 * "this" side of the bridge, drop it. 1670 */ 1671 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1672 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1673 if (src_if == dst_if) { 1674 m_freem(m); 1675 continue; 1676 } 1677 } else { 1678 /* ...forward it to all interfaces. */ 1679 sc->sc_if.if_imcasts++; 1680 dst_if = NULL; 1681 } 1682 1683 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1684 m->m_pkthdr.rcvif, PFIL_IN) != 0) { 1685 if (m != NULL) 1686 m_freem(m); 1687 continue; 1688 } 1689 if (m == NULL) 1690 continue; 1691 1692 if (dst_if == NULL) { 1693 bridge_broadcast(sc, src_if, m); 1694 continue; 1695 } 1696 1697 /* 1698 * At this point, we're dealing with a unicast frame 1699 * going to a different interface. 1700 */ 1701 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1702 m_freem(m); 1703 continue; 1704 } 1705 1706 bif = bridge_lookup_member_if(sc, dst_if); 1707 if (bif == NULL) { 1708 /* Not a member of the bridge (anymore?) */ 1709 m_freem(m); 1710 continue; 1711 } 1712 1713 if (bif->bif_flags & IFBIF_STP) { 1714 switch (bif->bif_state) { 1715 case BSTP_IFSTATE_DISABLED: 1716 case BSTP_IFSTATE_BLOCKING: 1717 m_freem(m); 1718 bridge_release_member(sc, bif); 1719 continue; 1720 } 1721 } 1722 1723 bridge_release_member(sc, bif); 1724 1725 bridge_enqueue(sc, dst_if, m, 1); 1726 } 1727 #ifndef BRIDGE_MPSAFE 1728 splx(s); 1729 mutex_exit(softnet_lock); 1730 KERNEL_UNLOCK_ONE(NULL); 1731 #endif 1732 } 1733 1734 static bool 1735 bstp_state_before_learning(struct bridge_iflist *bif) 1736 { 1737 if (bif->bif_flags & IFBIF_STP) { 1738 switch (bif->bif_state) { 1739 case BSTP_IFSTATE_BLOCKING: 1740 case BSTP_IFSTATE_LISTENING: 1741 case BSTP_IFSTATE_DISABLED: 1742 return true; 1743 } 1744 } 1745 return false; 1746 } 1747 1748 static bool 1749 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1750 { 1751 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1752 1753 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1754 #if NCARP > 0 1755 || (bif->bif_ifp->if_carp && 1756 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1757 #endif /* NCARP > 0 */ 1758 ) 1759 return true; 1760 1761 return false; 1762 } 1763 1764 /* 1765 * bridge_input: 1766 * 1767 * Receive input from a member interface. Queue the packet for 1768 * bridging if it is not for us. 1769 */ 1770 static void 1771 bridge_input(struct ifnet *ifp, struct mbuf *m) 1772 { 1773 struct bridge_softc *sc = ifp->if_bridge; 1774 struct bridge_iflist *bif; 1775 struct ether_header *eh; 1776 1777 if (__predict_false(sc == NULL) || 1778 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1779 ether_input(ifp, m); 1780 return; 1781 } 1782 1783 bif = bridge_lookup_member_if(sc, ifp); 1784 if (bif == NULL) { 1785 ether_input(ifp, m); 1786 return; 1787 } 1788 1789 eh = mtod(m, struct ether_header *); 1790 1791 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1792 if (memcmp(etherbroadcastaddr, 1793 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1794 m->m_flags |= M_BCAST; 1795 else 1796 m->m_flags |= M_MCAST; 1797 } 1798 1799 /* 1800 * A 'fast' path for packets addressed to interfaces that are 1801 * part of this bridge. 1802 */ 1803 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 1804 !bstp_state_before_learning(bif)) { 1805 struct bridge_iflist *_bif; 1806 1807 BRIDGE_LOCK(sc); 1808 LIST_FOREACH(_bif, &sc->sc_iflist, bif_next) { 1809 /* It is destined for us. */ 1810 if (bridge_ourether(_bif, eh, 0)) { 1811 if (_bif->bif_flags & IFBIF_LEARNING) 1812 (void) bridge_rtupdate(sc, 1813 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1814 m->m_pkthdr.rcvif = _bif->bif_ifp; 1815 ether_input(_bif->bif_ifp, m); 1816 break; 1817 } 1818 1819 /* We just received a packet that we sent out. */ 1820 if (bridge_ourether(_bif, eh, 1)) { 1821 m_freem(m); 1822 break; 1823 } 1824 } 1825 BRIDGE_UNLOCK(sc); 1826 1827 if (_bif != NULL) { 1828 bridge_release_member(sc, bif); 1829 return; 1830 } 1831 } 1832 1833 /* Tap off 802.1D packets; they do not get forwarded. */ 1834 if (bif->bif_flags & IFBIF_STP && 1835 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 1836 bstp_input(sc, bif, m); 1837 bridge_release_member(sc, bif); 1838 return; 1839 } 1840 1841 /* 1842 * A normal switch would discard the packet here, but that's not what 1843 * we've done historically. This also prevents some obnoxious behaviour. 1844 */ 1845 if (bstp_state_before_learning(bif)) { 1846 ether_input(ifp, m); 1847 bridge_release_member(sc, bif); 1848 return; 1849 } 1850 1851 bridge_release_member(sc, bif); 1852 1853 /* Queue the packet for bridge forwarding. */ 1854 if (__predict_false(!pktq_enqueue(sc->sc_fwd_pktq, m, 0))) 1855 m_freem(m); 1856 } 1857 1858 /* 1859 * bridge_broadcast: 1860 * 1861 * Send a frame to all interfaces that are members of 1862 * the bridge, except for the one on which the packet 1863 * arrived. 1864 */ 1865 static void 1866 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1867 struct mbuf *m) 1868 { 1869 struct bridge_iflist *bif; 1870 struct mbuf *mc; 1871 struct ifnet *dst_if; 1872 bool used, bmcast; 1873 1874 used = bmcast = m->m_flags & (M_BCAST|M_MCAST); 1875 1876 BRIDGE_LOCK(sc); 1877 1878 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1879 dst_if = bif->bif_ifp; 1880 if (dst_if == src_if) 1881 continue; 1882 1883 if (bif->bif_flags & IFBIF_STP) { 1884 switch (bif->bif_state) { 1885 case BSTP_IFSTATE_BLOCKING: 1886 case BSTP_IFSTATE_DISABLED: 1887 continue; 1888 } 1889 } 1890 1891 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 1892 continue; 1893 1894 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1895 continue; 1896 1897 if (!used && LIST_NEXT(bif, bif_next) == NULL) { 1898 mc = m; 1899 used = true; 1900 } else { 1901 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1902 if (mc == NULL) { 1903 sc->sc_if.if_oerrors++; 1904 continue; 1905 } 1906 } 1907 1908 bridge_enqueue(sc, dst_if, mc, 1); 1909 } 1910 1911 if (bmcast) 1912 ether_input(src_if, m); 1913 else if (!used) 1914 m_freem(m); 1915 1916 BRIDGE_UNLOCK(sc); 1917 } 1918 1919 /* 1920 * bridge_rtupdate: 1921 * 1922 * Add a bridge routing entry. 1923 */ 1924 static int 1925 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 1926 struct ifnet *dst_if, int setflags, uint8_t flags) 1927 { 1928 struct bridge_rtnode *brt; 1929 int error = 0; 1930 1931 mutex_enter(sc->sc_rtlist_lock); 1932 1933 /* 1934 * A route for this destination might already exist. If so, 1935 * update it, otherwise create a new one. 1936 */ 1937 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) { 1938 if (sc->sc_brtcnt >= sc->sc_brtmax) { 1939 error = ENOSPC; 1940 goto out; 1941 } 1942 1943 /* 1944 * Allocate a new bridge forwarding node, and 1945 * initialize the expiration time and Ethernet 1946 * address. 1947 */ 1948 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 1949 if (brt == NULL) { 1950 error = ENOMEM; 1951 goto out; 1952 } 1953 1954 memset(brt, 0, sizeof(*brt)); 1955 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1956 brt->brt_flags = IFBAF_DYNAMIC; 1957 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 1958 1959 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 1960 pool_put(&bridge_rtnode_pool, brt); 1961 goto out; 1962 } 1963 } 1964 1965 brt->brt_ifp = dst_if; 1966 if (setflags) { 1967 brt->brt_flags = flags; 1968 if (flags & IFBAF_STATIC) 1969 brt->brt_expire = 0; 1970 else 1971 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1972 } 1973 1974 out: 1975 mutex_exit(sc->sc_rtlist_lock); 1976 1977 return error; 1978 } 1979 1980 /* 1981 * bridge_rtlookup: 1982 * 1983 * Lookup the destination interface for an address. 1984 */ 1985 static struct ifnet * 1986 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 1987 { 1988 struct bridge_rtnode *brt; 1989 struct ifnet *ifs = NULL; 1990 1991 mutex_enter(sc->sc_rtlist_lock); 1992 1993 brt = bridge_rtnode_lookup(sc, addr); 1994 if (brt != NULL) 1995 ifs = brt->brt_ifp; 1996 1997 mutex_exit(sc->sc_rtlist_lock); 1998 1999 return ifs; 2000 } 2001 2002 /* 2003 * bridge_rttrim: 2004 * 2005 * Trim the routine table so that we have a number 2006 * of routing entries less than or equal to the 2007 * maximum number. 2008 */ 2009 static void 2010 bridge_rttrim(struct bridge_softc *sc) 2011 { 2012 struct bridge_rtnode *brt, *nbrt; 2013 2014 mutex_enter(sc->sc_rtlist_lock); 2015 2016 /* Make sure we actually need to do this. */ 2017 if (sc->sc_brtcnt <= sc->sc_brtmax) 2018 goto out; 2019 2020 /* Force an aging cycle; this might trim enough addresses. */ 2021 bridge_rtage(sc); 2022 if (sc->sc_brtcnt <= sc->sc_brtmax) 2023 goto out; 2024 2025 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2026 nbrt = LIST_NEXT(brt, brt_list); 2027 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2028 bridge_rtnode_destroy(sc, brt); 2029 if (sc->sc_brtcnt <= sc->sc_brtmax) 2030 goto out; 2031 } 2032 } 2033 2034 out: 2035 mutex_exit(sc->sc_rtlist_lock); 2036 2037 return; 2038 } 2039 2040 /* 2041 * bridge_timer: 2042 * 2043 * Aging timer for the bridge. 2044 */ 2045 static void 2046 bridge_timer(void *arg) 2047 { 2048 struct bridge_softc *sc = arg; 2049 2050 mutex_enter(sc->sc_rtlist_lock); 2051 2052 bridge_rtage(sc); 2053 2054 if (sc->sc_if.if_flags & IFF_RUNNING) 2055 callout_reset(&sc->sc_brcallout, 2056 bridge_rtable_prune_period * hz, bridge_timer, sc); 2057 2058 mutex_exit(sc->sc_rtlist_lock); 2059 } 2060 2061 /* 2062 * bridge_rtage: 2063 * 2064 * Perform an aging cycle. 2065 */ 2066 static void 2067 bridge_rtage(struct bridge_softc *sc) 2068 { 2069 struct bridge_rtnode *brt, *nbrt; 2070 2071 KASSERT(mutex_owned(sc->sc_rtlist_lock)); 2072 2073 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2074 nbrt = LIST_NEXT(brt, brt_list); 2075 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2076 if (time_uptime >= brt->brt_expire) 2077 bridge_rtnode_destroy(sc, brt); 2078 } 2079 } 2080 } 2081 2082 /* 2083 * bridge_rtflush: 2084 * 2085 * Remove all dynamic addresses from the bridge. 2086 */ 2087 static void 2088 bridge_rtflush(struct bridge_softc *sc, int full) 2089 { 2090 struct bridge_rtnode *brt, *nbrt; 2091 2092 mutex_enter(sc->sc_rtlist_lock); 2093 2094 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2095 nbrt = LIST_NEXT(brt, brt_list); 2096 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2097 bridge_rtnode_destroy(sc, brt); 2098 } 2099 2100 mutex_exit(sc->sc_rtlist_lock); 2101 } 2102 2103 /* 2104 * bridge_rtdaddr: 2105 * 2106 * Remove an address from the table. 2107 */ 2108 static int 2109 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2110 { 2111 struct bridge_rtnode *brt; 2112 int error = 0; 2113 2114 mutex_enter(sc->sc_rtlist_lock); 2115 2116 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2117 error = ENOENT; 2118 goto out; 2119 } 2120 2121 bridge_rtnode_destroy(sc, brt); 2122 2123 out: 2124 mutex_exit(sc->sc_rtlist_lock); 2125 2126 return error; 2127 } 2128 2129 /* 2130 * bridge_rtdelete: 2131 * 2132 * Delete routes to a speicifc member interface. 2133 */ 2134 static void 2135 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2136 { 2137 struct bridge_rtnode *brt, *nbrt; 2138 2139 mutex_enter(sc->sc_rtlist_lock); 2140 2141 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2142 nbrt = LIST_NEXT(brt, brt_list); 2143 if (brt->brt_ifp == ifp) 2144 bridge_rtnode_destroy(sc, brt); 2145 } 2146 2147 mutex_exit(sc->sc_rtlist_lock); 2148 } 2149 2150 /* 2151 * bridge_rtable_init: 2152 * 2153 * Initialize the route table for this bridge. 2154 */ 2155 static int 2156 bridge_rtable_init(struct bridge_softc *sc) 2157 { 2158 int i; 2159 2160 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2161 M_DEVBUF, M_NOWAIT); 2162 if (sc->sc_rthash == NULL) 2163 return (ENOMEM); 2164 2165 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2166 LIST_INIT(&sc->sc_rthash[i]); 2167 2168 sc->sc_rthash_key = cprng_fast32(); 2169 2170 LIST_INIT(&sc->sc_rtlist); 2171 2172 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NET); 2173 2174 return (0); 2175 } 2176 2177 /* 2178 * bridge_rtable_fini: 2179 * 2180 * Deconstruct the route table for this bridge. 2181 */ 2182 static void 2183 bridge_rtable_fini(struct bridge_softc *sc) 2184 { 2185 2186 free(sc->sc_rthash, M_DEVBUF); 2187 if (sc->sc_rtlist_lock) 2188 mutex_obj_free(sc->sc_rtlist_lock); 2189 } 2190 2191 /* 2192 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2193 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2194 */ 2195 #define mix(a, b, c) \ 2196 do { \ 2197 a -= b; a -= c; a ^= (c >> 13); \ 2198 b -= c; b -= a; b ^= (a << 8); \ 2199 c -= a; c -= b; c ^= (b >> 13); \ 2200 a -= b; a -= c; a ^= (c >> 12); \ 2201 b -= c; b -= a; b ^= (a << 16); \ 2202 c -= a; c -= b; c ^= (b >> 5); \ 2203 a -= b; a -= c; a ^= (c >> 3); \ 2204 b -= c; b -= a; b ^= (a << 10); \ 2205 c -= a; c -= b; c ^= (b >> 15); \ 2206 } while (/*CONSTCOND*/0) 2207 2208 static inline uint32_t 2209 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2210 { 2211 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2212 2213 b += addr[5] << 8; 2214 b += addr[4]; 2215 a += addr[3] << 24; 2216 a += addr[2] << 16; 2217 a += addr[1] << 8; 2218 a += addr[0]; 2219 2220 mix(a, b, c); 2221 2222 return (c & BRIDGE_RTHASH_MASK); 2223 } 2224 2225 #undef mix 2226 2227 /* 2228 * bridge_rtnode_lookup: 2229 * 2230 * Look up a bridge route node for the specified destination. 2231 */ 2232 static struct bridge_rtnode * 2233 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2234 { 2235 struct bridge_rtnode *brt; 2236 uint32_t hash; 2237 int dir; 2238 2239 KASSERT(mutex_owned(sc->sc_rtlist_lock)); 2240 2241 hash = bridge_rthash(sc, addr); 2242 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2243 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2244 if (dir == 0) 2245 return (brt); 2246 if (dir > 0) 2247 return (NULL); 2248 } 2249 2250 return (NULL); 2251 } 2252 2253 /* 2254 * bridge_rtnode_insert: 2255 * 2256 * Insert the specified bridge node into the route table. We 2257 * assume the entry is not already in the table. 2258 */ 2259 static int 2260 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2261 { 2262 struct bridge_rtnode *lbrt; 2263 uint32_t hash; 2264 int dir; 2265 2266 KASSERT(mutex_owned(sc->sc_rtlist_lock)); 2267 2268 hash = bridge_rthash(sc, brt->brt_addr); 2269 2270 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2271 if (lbrt == NULL) { 2272 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2273 goto out; 2274 } 2275 2276 do { 2277 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2278 if (dir == 0) 2279 return (EEXIST); 2280 if (dir > 0) { 2281 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2282 goto out; 2283 } 2284 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2285 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2286 goto out; 2287 } 2288 lbrt = LIST_NEXT(lbrt, brt_hash); 2289 } while (lbrt != NULL); 2290 2291 #ifdef DIAGNOSTIC 2292 panic("bridge_rtnode_insert: impossible"); 2293 #endif 2294 2295 out: 2296 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2297 sc->sc_brtcnt++; 2298 2299 return (0); 2300 } 2301 2302 /* 2303 * bridge_rtnode_destroy: 2304 * 2305 * Destroy a bridge rtnode. 2306 */ 2307 static void 2308 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2309 { 2310 2311 KASSERT(mutex_owned(sc->sc_rtlist_lock)); 2312 2313 LIST_REMOVE(brt, brt_hash); 2314 2315 LIST_REMOVE(brt, brt_list); 2316 sc->sc_brtcnt--; 2317 pool_put(&bridge_rtnode_pool, brt); 2318 } 2319 2320 #if defined(BRIDGE_IPF) 2321 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2322 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2323 2324 /* 2325 * Send bridge packets through IPF if they are one of the types IPF can deal 2326 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2327 * question.) 2328 */ 2329 static int 2330 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2331 { 2332 int snap, error; 2333 struct ether_header *eh1, eh2; 2334 struct llc llc1; 2335 uint16_t ether_type; 2336 2337 snap = 0; 2338 error = -1; /* Default error if not error == 0 */ 2339 eh1 = mtod(*mp, struct ether_header *); 2340 ether_type = ntohs(eh1->ether_type); 2341 2342 /* 2343 * Check for SNAP/LLC. 2344 */ 2345 if (ether_type < ETHERMTU) { 2346 struct llc *llc2 = (struct llc *)(eh1 + 1); 2347 2348 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2349 llc2->llc_dsap == LLC_SNAP_LSAP && 2350 llc2->llc_ssap == LLC_SNAP_LSAP && 2351 llc2->llc_control == LLC_UI) { 2352 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2353 snap = 1; 2354 } 2355 } 2356 2357 /* 2358 * If we're trying to filter bridge traffic, don't look at anything 2359 * other than IP and ARP traffic. If the filter doesn't understand 2360 * IPv6, don't allow IPv6 through the bridge either. This is lame 2361 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2362 * but of course we don't have an AppleTalk filter to begin with. 2363 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2364 * ARP traffic.) 2365 */ 2366 switch (ether_type) { 2367 case ETHERTYPE_ARP: 2368 case ETHERTYPE_REVARP: 2369 return 0; /* Automatically pass */ 2370 case ETHERTYPE_IP: 2371 # ifdef INET6 2372 case ETHERTYPE_IPV6: 2373 # endif /* INET6 */ 2374 break; 2375 default: 2376 goto bad; 2377 } 2378 2379 /* Strip off the Ethernet header and keep a copy. */ 2380 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2381 m_adj(*mp, ETHER_HDR_LEN); 2382 2383 /* Strip off snap header, if present */ 2384 if (snap) { 2385 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2386 m_adj(*mp, sizeof(struct llc)); 2387 } 2388 2389 /* 2390 * Check basic packet sanity and run IPF through pfil. 2391 */ 2392 KASSERT(!cpu_intr_p()); 2393 switch (ether_type) 2394 { 2395 case ETHERTYPE_IP : 2396 error = (dir == PFIL_IN) ? bridge_ip_checkbasic(mp) : 0; 2397 if (error == 0) 2398 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2399 break; 2400 # ifdef INET6 2401 case ETHERTYPE_IPV6 : 2402 error = (dir == PFIL_IN) ? bridge_ip6_checkbasic(mp) : 0; 2403 if (error == 0) 2404 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2405 break; 2406 # endif 2407 default : 2408 error = 0; 2409 break; 2410 } 2411 2412 if (*mp == NULL) 2413 return error; 2414 if (error != 0) 2415 goto bad; 2416 2417 error = -1; 2418 2419 /* 2420 * Finally, put everything back the way it was and return 2421 */ 2422 if (snap) { 2423 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2424 if (*mp == NULL) 2425 return error; 2426 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2427 } 2428 2429 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2430 if (*mp == NULL) 2431 return error; 2432 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2433 2434 return 0; 2435 2436 bad: 2437 m_freem(*mp); 2438 *mp = NULL; 2439 return error; 2440 } 2441 2442 /* 2443 * Perform basic checks on header size since 2444 * IPF assumes ip_input has already processed 2445 * it for it. Cut-and-pasted from ip_input.c. 2446 * Given how simple the IPv6 version is, 2447 * does the IPv4 version really need to be 2448 * this complicated? 2449 * 2450 * XXX Should we update ipstat here, or not? 2451 * XXX Right now we update ipstat but not 2452 * XXX csum_counter. 2453 */ 2454 static int 2455 bridge_ip_checkbasic(struct mbuf **mp) 2456 { 2457 struct mbuf *m = *mp; 2458 struct ip *ip; 2459 int len, hlen; 2460 2461 if (*mp == NULL) 2462 return -1; 2463 2464 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2465 if ((m = m_copyup(m, sizeof(struct ip), 2466 (max_linkhdr + 3) & ~3)) == NULL) { 2467 /* XXXJRT new stat, please */ 2468 ip_statinc(IP_STAT_TOOSMALL); 2469 goto bad; 2470 } 2471 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2472 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2473 ip_statinc(IP_STAT_TOOSMALL); 2474 goto bad; 2475 } 2476 } 2477 ip = mtod(m, struct ip *); 2478 if (ip == NULL) goto bad; 2479 2480 if (ip->ip_v != IPVERSION) { 2481 ip_statinc(IP_STAT_BADVERS); 2482 goto bad; 2483 } 2484 hlen = ip->ip_hl << 2; 2485 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2486 ip_statinc(IP_STAT_BADHLEN); 2487 goto bad; 2488 } 2489 if (hlen > m->m_len) { 2490 if ((m = m_pullup(m, hlen)) == 0) { 2491 ip_statinc(IP_STAT_BADHLEN); 2492 goto bad; 2493 } 2494 ip = mtod(m, struct ip *); 2495 if (ip == NULL) goto bad; 2496 } 2497 2498 switch (m->m_pkthdr.csum_flags & 2499 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 2500 M_CSUM_IPv4_BAD)) { 2501 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2502 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2503 goto bad; 2504 2505 case M_CSUM_IPv4: 2506 /* Checksum was okay. */ 2507 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2508 break; 2509 2510 default: 2511 /* Must compute it ourselves. */ 2512 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2513 if (in_cksum(m, hlen) != 0) 2514 goto bad; 2515 break; 2516 } 2517 2518 /* Retrieve the packet length. */ 2519 len = ntohs(ip->ip_len); 2520 2521 /* 2522 * Check for additional length bogosity 2523 */ 2524 if (len < hlen) { 2525 ip_statinc(IP_STAT_BADLEN); 2526 goto bad; 2527 } 2528 2529 /* 2530 * Check that the amount of data in the buffers 2531 * is as at least much as the IP header would have us expect. 2532 * Drop packet if shorter than we expect. 2533 */ 2534 if (m->m_pkthdr.len < len) { 2535 ip_statinc(IP_STAT_TOOSHORT); 2536 goto bad; 2537 } 2538 2539 /* Checks out, proceed */ 2540 *mp = m; 2541 return 0; 2542 2543 bad: 2544 *mp = m; 2545 return -1; 2546 } 2547 2548 # ifdef INET6 2549 /* 2550 * Same as above, but for IPv6. 2551 * Cut-and-pasted from ip6_input.c. 2552 * XXX Should we update ip6stat, or not? 2553 */ 2554 static int 2555 bridge_ip6_checkbasic(struct mbuf **mp) 2556 { 2557 struct mbuf *m = *mp; 2558 struct ip6_hdr *ip6; 2559 2560 /* 2561 * If the IPv6 header is not aligned, slurp it up into a new 2562 * mbuf with space for link headers, in the event we forward 2563 * it. Otherwise, if it is aligned, make sure the entire base 2564 * IPv6 header is in the first mbuf of the chain. 2565 */ 2566 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2567 struct ifnet *inifp = m->m_pkthdr.rcvif; 2568 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2569 (max_linkhdr + 3) & ~3)) == NULL) { 2570 /* XXXJRT new stat, please */ 2571 ip6_statinc(IP6_STAT_TOOSMALL); 2572 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2573 goto bad; 2574 } 2575 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2576 struct ifnet *inifp = m->m_pkthdr.rcvif; 2577 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2578 ip6_statinc(IP6_STAT_TOOSMALL); 2579 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2580 goto bad; 2581 } 2582 } 2583 2584 ip6 = mtod(m, struct ip6_hdr *); 2585 2586 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2587 ip6_statinc(IP6_STAT_BADVERS); 2588 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 2589 goto bad; 2590 } 2591 2592 /* Checks out, proceed */ 2593 *mp = m; 2594 return 0; 2595 2596 bad: 2597 *mp = m; 2598 return -1; 2599 } 2600 # endif /* INET6 */ 2601 #endif /* BRIDGE_IPF */ 2602
Indexes created Thu Oct 02 14:10:14 GMT 2025