if_bridge.c revision 1.90
1 /* $NetBSD: if_bridge.c,v 1.90 2014/07/23 05:32:23 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 1.90 2014/07/23 05:32:23 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 *breqs; 983 int i, count, 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 || bifc->ifbic_len < (sizeof(*breqs) * count)) { 992 BRIDGE_UNLOCK(sc); 993 /* Tell that a larger buffer is needed */ 994 bifc->ifbic_len = sizeof(*breqs) * count; 995 return 0; 996 } 997 998 breqs = malloc(sizeof(*breqs) * count, M_DEVBUF, M_NOWAIT); 999 1000 i = 0; 1001 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1002 struct ifbreq *breq = &breqs[i++]; 1003 memset(breq, 0, sizeof(*breq)); 1004 1005 strlcpy(breq->ifbr_ifsname, bif->bif_ifp->if_xname, 1006 sizeof(breq->ifbr_ifsname)); 1007 breq->ifbr_ifsflags = bif->bif_flags; 1008 breq->ifbr_state = bif->bif_state; 1009 breq->ifbr_priority = bif->bif_priority; 1010 breq->ifbr_path_cost = bif->bif_path_cost; 1011 breq->ifbr_portno = bif->bif_ifp->if_index & 0xff; 1012 } 1013 1014 /* Don't call copyout with holding the mutex */ 1015 BRIDGE_UNLOCK(sc); 1016 1017 for (i = 0; i < count; i++) { 1018 error = copyout(&breqs[i], bifc->ifbic_req + i, sizeof(*breqs)); 1019 if (error) 1020 break; 1021 } 1022 bifc->ifbic_len = sizeof(*breqs) * i; 1023 1024 free(breqs, M_DEVBUF); 1025 1026 return error; 1027 } 1028 1029 static int 1030 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1031 { 1032 struct ifbaconf *bac = arg; 1033 struct bridge_rtnode *brt; 1034 struct ifbareq bareq; 1035 int count = 0, error = 0, len; 1036 1037 if (bac->ifbac_len == 0) 1038 return (0); 1039 1040 mutex_enter(sc->sc_rtlist_lock); 1041 1042 len = bac->ifbac_len; 1043 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1044 if (len < sizeof(bareq)) 1045 goto out; 1046 memset(&bareq, 0, sizeof(bareq)); 1047 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1048 sizeof(bareq.ifba_ifsname)); 1049 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1050 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 1051 bareq.ifba_expire = brt->brt_expire - time_uptime; 1052 } else 1053 bareq.ifba_expire = 0; 1054 bareq.ifba_flags = brt->brt_flags; 1055 1056 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1057 if (error) 1058 goto out; 1059 count++; 1060 len -= sizeof(bareq); 1061 } 1062 out: 1063 mutex_exit(sc->sc_rtlist_lock); 1064 1065 bac->ifbac_len = sizeof(bareq) * count; 1066 return (error); 1067 } 1068 1069 static int 1070 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1071 { 1072 struct ifbareq *req = arg; 1073 struct bridge_iflist *bif; 1074 int error; 1075 1076 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1077 if (bif == NULL) 1078 return (ENOENT); 1079 1080 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1081 req->ifba_flags); 1082 1083 bridge_release_member(sc, bif); 1084 1085 return (error); 1086 } 1087 1088 static int 1089 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1090 { 1091 struct ifbrparam *param = arg; 1092 1093 sc->sc_brttimeout = param->ifbrp_ctime; 1094 1095 return (0); 1096 } 1097 1098 static int 1099 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1100 { 1101 struct ifbrparam *param = arg; 1102 1103 param->ifbrp_ctime = sc->sc_brttimeout; 1104 1105 return (0); 1106 } 1107 1108 static int 1109 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1110 { 1111 struct ifbareq *req = arg; 1112 1113 return (bridge_rtdaddr(sc, req->ifba_dst)); 1114 } 1115 1116 static int 1117 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1118 { 1119 struct ifbreq *req = arg; 1120 1121 bridge_rtflush(sc, req->ifbr_ifsflags); 1122 1123 return (0); 1124 } 1125 1126 static int 1127 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1128 { 1129 struct ifbrparam *param = arg; 1130 1131 param->ifbrp_prio = sc->sc_bridge_priority; 1132 1133 return (0); 1134 } 1135 1136 static int 1137 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1138 { 1139 struct ifbrparam *param = arg; 1140 1141 sc->sc_bridge_priority = param->ifbrp_prio; 1142 1143 if (sc->sc_if.if_flags & IFF_RUNNING) 1144 bstp_initialization(sc); 1145 1146 return (0); 1147 } 1148 1149 static int 1150 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1151 { 1152 struct ifbrparam *param = arg; 1153 1154 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1155 1156 return (0); 1157 } 1158 1159 static int 1160 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1161 { 1162 struct ifbrparam *param = arg; 1163 1164 if (param->ifbrp_hellotime == 0) 1165 return (EINVAL); 1166 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1167 1168 if (sc->sc_if.if_flags & IFF_RUNNING) 1169 bstp_initialization(sc); 1170 1171 return (0); 1172 } 1173 1174 static int 1175 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1176 { 1177 struct ifbrparam *param = arg; 1178 1179 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1180 1181 return (0); 1182 } 1183 1184 static int 1185 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1186 { 1187 struct ifbrparam *param = arg; 1188 1189 if (param->ifbrp_fwddelay == 0) 1190 return (EINVAL); 1191 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1192 1193 if (sc->sc_if.if_flags & IFF_RUNNING) 1194 bstp_initialization(sc); 1195 1196 return (0); 1197 } 1198 1199 static int 1200 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1201 { 1202 struct ifbrparam *param = arg; 1203 1204 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1205 1206 return (0); 1207 } 1208 1209 static int 1210 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1211 { 1212 struct ifbrparam *param = arg; 1213 1214 if (param->ifbrp_maxage == 0) 1215 return (EINVAL); 1216 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1217 1218 if (sc->sc_if.if_flags & IFF_RUNNING) 1219 bstp_initialization(sc); 1220 1221 return (0); 1222 } 1223 1224 static int 1225 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1226 { 1227 struct ifbreq *req = arg; 1228 struct bridge_iflist *bif; 1229 1230 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1231 if (bif == NULL) 1232 return (ENOENT); 1233 1234 bif->bif_priority = req->ifbr_priority; 1235 1236 if (sc->sc_if.if_flags & IFF_RUNNING) 1237 bstp_initialization(sc); 1238 1239 bridge_release_member(sc, bif); 1240 1241 return (0); 1242 } 1243 1244 #if defined(BRIDGE_IPF) 1245 static int 1246 bridge_ioctl_gfilt(struct bridge_softc *sc, void *arg) 1247 { 1248 struct ifbrparam *param = arg; 1249 1250 param->ifbrp_filter = sc->sc_filter_flags; 1251 1252 return (0); 1253 } 1254 1255 static int 1256 bridge_ioctl_sfilt(struct bridge_softc *sc, void *arg) 1257 { 1258 struct ifbrparam *param = arg; 1259 uint32_t nflags, oflags; 1260 1261 if (param->ifbrp_filter & ~IFBF_FILT_MASK) 1262 return (EINVAL); 1263 1264 nflags = param->ifbrp_filter; 1265 oflags = sc->sc_filter_flags; 1266 1267 if ((nflags & IFBF_FILT_USEIPF) && !(oflags & IFBF_FILT_USEIPF)) { 1268 pfil_add_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1269 sc->sc_if.if_pfil); 1270 } 1271 if (!(nflags & IFBF_FILT_USEIPF) && (oflags & IFBF_FILT_USEIPF)) { 1272 pfil_remove_hook((void *)bridge_ipf, NULL, PFIL_IN|PFIL_OUT, 1273 sc->sc_if.if_pfil); 1274 } 1275 1276 sc->sc_filter_flags = nflags; 1277 1278 return (0); 1279 } 1280 #endif /* BRIDGE_IPF */ 1281 1282 static int 1283 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1284 { 1285 struct ifbreq *req = arg; 1286 struct bridge_iflist *bif; 1287 1288 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1289 if (bif == NULL) 1290 return (ENOENT); 1291 1292 bif->bif_path_cost = req->ifbr_path_cost; 1293 1294 if (sc->sc_if.if_flags & IFF_RUNNING) 1295 bstp_initialization(sc); 1296 1297 bridge_release_member(sc, bif); 1298 1299 return (0); 1300 } 1301 1302 /* 1303 * bridge_ifdetach: 1304 * 1305 * Detach an interface from a bridge. Called when a member 1306 * interface is detaching. 1307 */ 1308 void 1309 bridge_ifdetach(struct ifnet *ifp) 1310 { 1311 struct bridge_softc *sc = ifp->if_bridge; 1312 struct ifbreq breq; 1313 1314 /* ioctl_lock should prevent this from happening */ 1315 KASSERT(sc != NULL); 1316 1317 memset(&breq, 0, sizeof(breq)); 1318 strlcpy(breq.ifbr_ifsname, ifp->if_xname, sizeof(breq.ifbr_ifsname)); 1319 1320 (void) bridge_ioctl_del(sc, &breq); 1321 } 1322 1323 /* 1324 * bridge_init: 1325 * 1326 * Initialize a bridge interface. 1327 */ 1328 static int 1329 bridge_init(struct ifnet *ifp) 1330 { 1331 struct bridge_softc *sc = ifp->if_softc; 1332 1333 if (ifp->if_flags & IFF_RUNNING) 1334 return (0); 1335 1336 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1337 bridge_timer, sc); 1338 1339 ifp->if_flags |= IFF_RUNNING; 1340 bstp_initialization(sc); 1341 return (0); 1342 } 1343 1344 /* 1345 * bridge_stop: 1346 * 1347 * Stop the bridge interface. 1348 */ 1349 static void 1350 bridge_stop(struct ifnet *ifp, int disable) 1351 { 1352 struct bridge_softc *sc = ifp->if_softc; 1353 1354 if ((ifp->if_flags & IFF_RUNNING) == 0) 1355 return; 1356 1357 callout_stop(&sc->sc_brcallout); 1358 bstp_stop(sc); 1359 1360 bridge_rtflush(sc, IFBF_FLUSHDYN); 1361 1362 ifp->if_flags &= ~IFF_RUNNING; 1363 } 1364 1365 /* 1366 * bridge_enqueue: 1367 * 1368 * Enqueue a packet on a bridge member interface. 1369 */ 1370 void 1371 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m, 1372 int runfilt) 1373 { 1374 ALTQ_DECL(struct altq_pktattr pktattr;) 1375 int len, error; 1376 short mflags; 1377 1378 /* 1379 * Clear any in-bound checksum flags for this packet. 1380 */ 1381 m->m_pkthdr.csum_flags = 0; 1382 1383 if (runfilt) { 1384 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1385 dst_ifp, PFIL_OUT) != 0) { 1386 if (m != NULL) 1387 m_freem(m); 1388 return; 1389 } 1390 if (m == NULL) 1391 return; 1392 } 1393 1394 #ifdef ALTQ 1395 /* 1396 * If ALTQ is enabled on the member interface, do 1397 * classification; the queueing discipline might 1398 * not require classification, but might require 1399 * the address family/header pointer in the pktattr. 1400 */ 1401 if (ALTQ_IS_ENABLED(&dst_ifp->if_snd)) { 1402 /* XXX IFT_ETHER */ 1403 altq_etherclassify(&dst_ifp->if_snd, m, &pktattr); 1404 } 1405 #endif /* ALTQ */ 1406 1407 len = m->m_pkthdr.len; 1408 m->m_flags |= M_PROTO1; 1409 mflags = m->m_flags; 1410 1411 IFQ_ENQUEUE(&dst_ifp->if_snd, m, &pktattr, error); 1412 1413 if (error) { 1414 /* mbuf is already freed */ 1415 sc->sc_if.if_oerrors++; 1416 return; 1417 } 1418 1419 sc->sc_if.if_opackets++; 1420 sc->sc_if.if_obytes += len; 1421 1422 dst_ifp->if_obytes += len; 1423 1424 if (mflags & M_MCAST) { 1425 sc->sc_if.if_omcasts++; 1426 dst_ifp->if_omcasts++; 1427 } 1428 1429 if ((dst_ifp->if_flags & IFF_OACTIVE) == 0) 1430 (*dst_ifp->if_start)(dst_ifp); 1431 } 1432 1433 /* 1434 * bridge_output: 1435 * 1436 * Send output from a bridge member interface. This 1437 * performs the bridging function for locally originated 1438 * packets. 1439 * 1440 * The mbuf has the Ethernet header already attached. We must 1441 * enqueue or free the mbuf before returning. 1442 */ 1443 int 1444 bridge_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *sa, 1445 struct rtentry *rt) 1446 { 1447 struct ether_header *eh; 1448 struct ifnet *dst_if; 1449 struct bridge_softc *sc; 1450 #ifndef BRIDGE_MPSAFE 1451 int s; 1452 #endif 1453 1454 if (m->m_len < ETHER_HDR_LEN) { 1455 m = m_pullup(m, ETHER_HDR_LEN); 1456 if (m == NULL) 1457 return (0); 1458 } 1459 1460 eh = mtod(m, struct ether_header *); 1461 sc = ifp->if_bridge; 1462 1463 #ifndef BRIDGE_MPSAFE 1464 s = splnet(); 1465 #endif 1466 1467 /* 1468 * If bridge is down, but the original output interface is up, 1469 * go ahead and send out that interface. Otherwise, the packet 1470 * is dropped below. 1471 */ 1472 if (__predict_false(sc == NULL) || 1473 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1474 dst_if = ifp; 1475 goto sendunicast; 1476 } 1477 1478 /* 1479 * If the packet is a multicast, or we don't know a better way to 1480 * get there, send to all interfaces. 1481 */ 1482 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1483 dst_if = NULL; 1484 else 1485 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1486 if (dst_if == NULL) { 1487 struct bridge_iflist *bif; 1488 struct mbuf *mc; 1489 int used = 0; 1490 1491 BRIDGE_LOCK(sc); 1492 1493 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1494 dst_if = bif->bif_ifp; 1495 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1496 continue; 1497 1498 /* 1499 * If this is not the original output interface, 1500 * and the interface is participating in spanning 1501 * tree, make sure the port is in a state that 1502 * allows forwarding. 1503 */ 1504 if (dst_if != ifp && 1505 (bif->bif_flags & IFBIF_STP) != 0) { 1506 switch (bif->bif_state) { 1507 case BSTP_IFSTATE_BLOCKING: 1508 case BSTP_IFSTATE_LISTENING: 1509 case BSTP_IFSTATE_DISABLED: 1510 continue; 1511 } 1512 } 1513 1514 if (LIST_NEXT(bif, bif_next) == NULL) { 1515 used = 1; 1516 mc = m; 1517 } else { 1518 mc = m_copym(m, 0, M_COPYALL, M_NOWAIT); 1519 if (mc == NULL) { 1520 sc->sc_if.if_oerrors++; 1521 continue; 1522 } 1523 } 1524 1525 bridge_enqueue(sc, dst_if, mc, 0); 1526 } 1527 1528 BRIDGE_UNLOCK(sc); 1529 1530 if (used == 0) 1531 m_freem(m); 1532 #ifndef BRIDGE_MPSAFE 1533 splx(s); 1534 #endif 1535 return (0); 1536 } 1537 1538 sendunicast: 1539 /* 1540 * XXX Spanning tree consideration here? 1541 */ 1542 1543 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1544 m_freem(m); 1545 #ifndef BRIDGE_MPSAFE 1546 splx(s); 1547 #endif 1548 return (0); 1549 } 1550 1551 bridge_enqueue(sc, dst_if, m, 0); 1552 1553 #ifndef BRIDGE_MPSAFE 1554 splx(s); 1555 #endif 1556 return (0); 1557 } 1558 1559 /* 1560 * bridge_start: 1561 * 1562 * Start output on a bridge. 1563 * 1564 * NOTE: This routine should never be called in this implementation. 1565 */ 1566 static void 1567 bridge_start(struct ifnet *ifp) 1568 { 1569 1570 printf("%s: bridge_start() called\n", ifp->if_xname); 1571 } 1572 1573 /* 1574 * bridge_forward: 1575 * 1576 * The forwarding function of the bridge. 1577 */ 1578 static void 1579 bridge_forward(void *v) 1580 { 1581 struct bridge_softc *sc = v; 1582 struct mbuf *m; 1583 struct bridge_iflist *bif; 1584 struct ifnet *src_if, *dst_if; 1585 struct ether_header *eh; 1586 #ifndef BRIDGE_MPSAFE 1587 int s; 1588 1589 KERNEL_LOCK(1, NULL); 1590 mutex_enter(softnet_lock); 1591 #endif 1592 1593 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1594 #ifndef BRIDGE_MPSAFE 1595 mutex_exit(softnet_lock); 1596 KERNEL_UNLOCK_ONE(NULL); 1597 #endif 1598 return; 1599 } 1600 1601 #ifndef BRIDGE_MPSAFE 1602 s = splnet(); 1603 #endif 1604 while ((m = pktq_dequeue(sc->sc_fwd_pktq)) != NULL) { 1605 src_if = m->m_pkthdr.rcvif; 1606 1607 sc->sc_if.if_ipackets++; 1608 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1609 1610 /* 1611 * Look up the bridge_iflist. 1612 */ 1613 bif = bridge_lookup_member_if(sc, src_if); 1614 if (bif == NULL) { 1615 /* Interface is not a bridge member (anymore?) */ 1616 m_freem(m); 1617 continue; 1618 } 1619 1620 if (bif->bif_flags & IFBIF_STP) { 1621 switch (bif->bif_state) { 1622 case BSTP_IFSTATE_BLOCKING: 1623 case BSTP_IFSTATE_LISTENING: 1624 case BSTP_IFSTATE_DISABLED: 1625 m_freem(m); 1626 bridge_release_member(sc, bif); 1627 continue; 1628 } 1629 } 1630 1631 eh = mtod(m, struct ether_header *); 1632 1633 /* 1634 * If the interface is learning, and the source 1635 * address is valid and not multicast, record 1636 * the address. 1637 */ 1638 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1639 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1640 (eh->ether_shost[0] == 0 && 1641 eh->ether_shost[1] == 0 && 1642 eh->ether_shost[2] == 0 && 1643 eh->ether_shost[3] == 0 && 1644 eh->ether_shost[4] == 0 && 1645 eh->ether_shost[5] == 0) == 0) { 1646 (void) bridge_rtupdate(sc, eh->ether_shost, 1647 src_if, 0, IFBAF_DYNAMIC); 1648 } 1649 1650 if ((bif->bif_flags & IFBIF_STP) != 0 && 1651 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1652 m_freem(m); 1653 bridge_release_member(sc, bif); 1654 continue; 1655 } 1656 1657 bridge_release_member(sc, bif); 1658 1659 /* 1660 * At this point, the port either doesn't participate 1661 * in spanning tree or it is in the forwarding state. 1662 */ 1663 1664 /* 1665 * If the packet is unicast, destined for someone on 1666 * "this" side of the bridge, drop it. 1667 */ 1668 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1669 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1670 if (src_if == dst_if) { 1671 m_freem(m); 1672 continue; 1673 } 1674 } else { 1675 /* ...forward it to all interfaces. */ 1676 sc->sc_if.if_imcasts++; 1677 dst_if = NULL; 1678 } 1679 1680 if (pfil_run_hooks(sc->sc_if.if_pfil, &m, 1681 m->m_pkthdr.rcvif, PFIL_IN) != 0) { 1682 if (m != NULL) 1683 m_freem(m); 1684 continue; 1685 } 1686 if (m == NULL) 1687 continue; 1688 1689 if (dst_if == NULL) { 1690 bridge_broadcast(sc, src_if, m); 1691 continue; 1692 } 1693 1694 /* 1695 * At this point, we're dealing with a unicast frame 1696 * going to a different interface. 1697 */ 1698 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1699 m_freem(m); 1700 continue; 1701 } 1702 1703 bif = bridge_lookup_member_if(sc, dst_if); 1704 if (bif == NULL) { 1705 /* Not a member of the bridge (anymore?) */ 1706 m_freem(m); 1707 continue; 1708 } 1709 1710 if (bif->bif_flags & IFBIF_STP) { 1711 switch (bif->bif_state) { 1712 case BSTP_IFSTATE_DISABLED: 1713 case BSTP_IFSTATE_BLOCKING: 1714 m_freem(m); 1715 bridge_release_member(sc, bif); 1716 continue; 1717 } 1718 } 1719 1720 bridge_release_member(sc, bif); 1721 1722 bridge_enqueue(sc, dst_if, m, 1); 1723 } 1724 #ifndef BRIDGE_MPSAFE 1725 splx(s); 1726 mutex_exit(softnet_lock); 1727 KERNEL_UNLOCK_ONE(NULL); 1728 #endif 1729 } 1730 1731 static bool 1732 bstp_state_before_learning(struct bridge_iflist *bif) 1733 { 1734 if (bif->bif_flags & IFBIF_STP) { 1735 switch (bif->bif_state) { 1736 case BSTP_IFSTATE_BLOCKING: 1737 case BSTP_IFSTATE_LISTENING: 1738 case BSTP_IFSTATE_DISABLED: 1739 return true; 1740 } 1741 } 1742 return false; 1743 } 1744 1745 static bool 1746 bridge_ourether(struct bridge_iflist *bif, struct ether_header *eh, int src) 1747 { 1748 uint8_t *ether = src ? eh->ether_shost : eh->ether_dhost; 1749 1750 if (memcmp(CLLADDR(bif->bif_ifp->if_sadl), ether, ETHER_ADDR_LEN) == 0 1751 #if NCARP > 0 1752 || (bif->bif_ifp->if_carp && 1753 carp_ourether(bif->bif_ifp->if_carp, eh, IFT_ETHER, src) != NULL) 1754 #endif /* NCARP > 0 */ 1755 ) 1756 return true; 1757 1758 return false; 1759 } 1760 1761 /* 1762 * bridge_input: 1763 * 1764 * Receive input from a member interface. Queue the packet for 1765 * bridging if it is not for us. 1766 */ 1767 static void 1768 bridge_input(struct ifnet *ifp, struct mbuf *m) 1769 { 1770 struct bridge_softc *sc = ifp->if_bridge; 1771 struct bridge_iflist *bif; 1772 struct ether_header *eh; 1773 1774 if (__predict_false(sc == NULL) || 1775 (sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1776 ether_input(ifp, m); 1777 return; 1778 } 1779 1780 bif = bridge_lookup_member_if(sc, ifp); 1781 if (bif == NULL) { 1782 ether_input(ifp, m); 1783 return; 1784 } 1785 1786 eh = mtod(m, struct ether_header *); 1787 1788 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1789 if (memcmp(etherbroadcastaddr, 1790 eh->ether_dhost, ETHER_ADDR_LEN) == 0) 1791 m->m_flags |= M_BCAST; 1792 else 1793 m->m_flags |= M_MCAST; 1794 } 1795 1796 /* 1797 * A 'fast' path for packets addressed to interfaces that are 1798 * part of this bridge. 1799 */ 1800 if (!(m->m_flags & (M_BCAST|M_MCAST)) && 1801 !bstp_state_before_learning(bif)) { 1802 struct bridge_iflist *_bif; 1803 1804 BRIDGE_LOCK(sc); 1805 LIST_FOREACH(_bif, &sc->sc_iflist, bif_next) { 1806 /* It is destined for us. */ 1807 if (bridge_ourether(_bif, eh, 0)) { 1808 if (_bif->bif_flags & IFBIF_LEARNING) 1809 (void) bridge_rtupdate(sc, 1810 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1811 m->m_pkthdr.rcvif = _bif->bif_ifp; 1812 ether_input(_bif->bif_ifp, m); 1813 break; 1814 } 1815 1816 /* We just received a packet that we sent out. */ 1817 if (bridge_ourether(_bif, eh, 1)) { 1818 m_freem(m); 1819 break; 1820 } 1821 } 1822 BRIDGE_UNLOCK(sc); 1823 1824 if (_bif != NULL) { 1825 bridge_release_member(sc, bif); 1826 return; 1827 } 1828 } 1829 1830 /* Tap off 802.1D packets; they do not get forwarded. */ 1831 if (bif->bif_flags & IFBIF_STP && 1832 memcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { 1833 bstp_input(sc, bif, m); 1834 bridge_release_member(sc, bif); 1835 return; 1836 } 1837 1838 /* 1839 * A normal switch would discard the packet here, but that's not what 1840 * we've done historically. This also prevents some obnoxious behaviour. 1841 */ 1842 if (bstp_state_before_learning(bif)) { 1843 ether_input(ifp, m); 1844 bridge_release_member(sc, bif); 1845 return; 1846 } 1847 1848 bridge_release_member(sc, bif); 1849 1850 /* Queue the packet for bridge forwarding. */ 1851 if (__predict_false(!pktq_enqueue(sc->sc_fwd_pktq, m, 0))) 1852 m_freem(m); 1853 } 1854 1855 /* 1856 * bridge_broadcast: 1857 * 1858 * Send a frame to all interfaces that are members of 1859 * the bridge, except for the one on which the packet 1860 * arrived. 1861 */ 1862 static void 1863 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 1864 struct mbuf *m) 1865 { 1866 struct bridge_iflist *bif; 1867 struct mbuf *mc; 1868 struct ifnet *dst_if; 1869 bool used, bmcast; 1870 1871 used = bmcast = m->m_flags & (M_BCAST|M_MCAST); 1872 1873 BRIDGE_LOCK(sc); 1874 1875 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1876 dst_if = bif->bif_ifp; 1877 if (dst_if == src_if) 1878 continue; 1879 1880 if (bif->bif_flags & IFBIF_STP) { 1881 switch (bif->bif_state) { 1882 case BSTP_IFSTATE_BLOCKING: 1883 case BSTP_IFSTATE_DISABLED: 1884 continue; 1885 } 1886 } 1887 1888 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && !bmcast) 1889 continue; 1890 1891 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1892 continue; 1893 1894 if (!used && LIST_NEXT(bif, bif_next) == NULL) { 1895 mc = m; 1896 used = true; 1897 } else { 1898 mc = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 1899 if (mc == NULL) { 1900 sc->sc_if.if_oerrors++; 1901 continue; 1902 } 1903 } 1904 1905 bridge_enqueue(sc, dst_if, mc, 1); 1906 } 1907 1908 if (bmcast) 1909 ether_input(src_if, m); 1910 else if (!used) 1911 m_freem(m); 1912 1913 BRIDGE_UNLOCK(sc); 1914 } 1915 1916 /* 1917 * bridge_rtupdate: 1918 * 1919 * Add a bridge routing entry. 1920 */ 1921 static int 1922 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 1923 struct ifnet *dst_if, int setflags, uint8_t flags) 1924 { 1925 struct bridge_rtnode *brt; 1926 int error = 0; 1927 1928 mutex_enter(sc->sc_rtlist_lock); 1929 1930 /* 1931 * A route for this destination might already exist. If so, 1932 * update it, otherwise create a new one. 1933 */ 1934 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) { 1935 if (sc->sc_brtcnt >= sc->sc_brtmax) { 1936 error = ENOSPC; 1937 goto out; 1938 } 1939 1940 /* 1941 * Allocate a new bridge forwarding node, and 1942 * initialize the expiration time and Ethernet 1943 * address. 1944 */ 1945 brt = pool_get(&bridge_rtnode_pool, PR_NOWAIT); 1946 if (brt == NULL) { 1947 error = ENOMEM; 1948 goto out; 1949 } 1950 1951 memset(brt, 0, sizeof(*brt)); 1952 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1953 brt->brt_flags = IFBAF_DYNAMIC; 1954 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 1955 1956 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 1957 pool_put(&bridge_rtnode_pool, brt); 1958 goto out; 1959 } 1960 } 1961 1962 brt->brt_ifp = dst_if; 1963 if (setflags) { 1964 brt->brt_flags = flags; 1965 if (flags & IFBAF_STATIC) 1966 brt->brt_expire = 0; 1967 else 1968 brt->brt_expire = time_uptime + sc->sc_brttimeout; 1969 } 1970 1971 out: 1972 mutex_exit(sc->sc_rtlist_lock); 1973 1974 return error; 1975 } 1976 1977 /* 1978 * bridge_rtlookup: 1979 * 1980 * Lookup the destination interface for an address. 1981 */ 1982 static struct ifnet * 1983 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 1984 { 1985 struct bridge_rtnode *brt; 1986 struct ifnet *ifs = NULL; 1987 1988 mutex_enter(sc->sc_rtlist_lock); 1989 1990 brt = bridge_rtnode_lookup(sc, addr); 1991 if (brt != NULL) 1992 ifs = brt->brt_ifp; 1993 1994 mutex_exit(sc->sc_rtlist_lock); 1995 1996 return ifs; 1997 } 1998 1999 /* 2000 * bridge_rttrim: 2001 * 2002 * Trim the routine table so that we have a number 2003 * of routing entries less than or equal to the 2004 * maximum number. 2005 */ 2006 static void 2007 bridge_rttrim(struct bridge_softc *sc) 2008 { 2009 struct bridge_rtnode *brt, *nbrt; 2010 2011 mutex_enter(sc->sc_rtlist_lock); 2012 2013 /* Make sure we actually need to do this. */ 2014 if (sc->sc_brtcnt <= sc->sc_brtmax) 2015 goto out; 2016 2017 /* Force an aging cycle; this might trim enough addresses. */ 2018 bridge_rtage(sc); 2019 if (sc->sc_brtcnt <= sc->sc_brtmax) 2020 goto out; 2021 2022 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2023 nbrt = LIST_NEXT(brt, brt_list); 2024 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2025 bridge_rtnode_destroy(sc, brt); 2026 if (sc->sc_brtcnt <= sc->sc_brtmax) 2027 goto out; 2028 } 2029 } 2030 2031 out: 2032 mutex_exit(sc->sc_rtlist_lock); 2033 2034 return; 2035 } 2036 2037 /* 2038 * bridge_timer: 2039 * 2040 * Aging timer for the bridge. 2041 */ 2042 static void 2043 bridge_timer(void *arg) 2044 { 2045 struct bridge_softc *sc = arg; 2046 2047 mutex_enter(sc->sc_rtlist_lock); 2048 2049 bridge_rtage(sc); 2050 2051 if (sc->sc_if.if_flags & IFF_RUNNING) 2052 callout_reset(&sc->sc_brcallout, 2053 bridge_rtable_prune_period * hz, bridge_timer, sc); 2054 2055 mutex_exit(sc->sc_rtlist_lock); 2056 } 2057 2058 /* 2059 * bridge_rtage: 2060 * 2061 * Perform an aging cycle. 2062 */ 2063 static void 2064 bridge_rtage(struct bridge_softc *sc) 2065 { 2066 struct bridge_rtnode *brt, *nbrt; 2067 2068 KASSERT(mutex_owned(sc->sc_rtlist_lock)); 2069 2070 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2071 nbrt = LIST_NEXT(brt, brt_list); 2072 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2073 if (time_uptime >= brt->brt_expire) 2074 bridge_rtnode_destroy(sc, brt); 2075 } 2076 } 2077 } 2078 2079 /* 2080 * bridge_rtflush: 2081 * 2082 * Remove all dynamic addresses from the bridge. 2083 */ 2084 static void 2085 bridge_rtflush(struct bridge_softc *sc, int full) 2086 { 2087 struct bridge_rtnode *brt, *nbrt; 2088 2089 mutex_enter(sc->sc_rtlist_lock); 2090 2091 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2092 nbrt = LIST_NEXT(brt, brt_list); 2093 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2094 bridge_rtnode_destroy(sc, brt); 2095 } 2096 2097 mutex_exit(sc->sc_rtlist_lock); 2098 } 2099 2100 /* 2101 * bridge_rtdaddr: 2102 * 2103 * Remove an address from the table. 2104 */ 2105 static int 2106 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2107 { 2108 struct bridge_rtnode *brt; 2109 int error = 0; 2110 2111 mutex_enter(sc->sc_rtlist_lock); 2112 2113 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) { 2114 error = ENOENT; 2115 goto out; 2116 } 2117 2118 bridge_rtnode_destroy(sc, brt); 2119 2120 out: 2121 mutex_exit(sc->sc_rtlist_lock); 2122 2123 return error; 2124 } 2125 2126 /* 2127 * bridge_rtdelete: 2128 * 2129 * Delete routes to a speicifc member interface. 2130 */ 2131 static void 2132 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp) 2133 { 2134 struct bridge_rtnode *brt, *nbrt; 2135 2136 mutex_enter(sc->sc_rtlist_lock); 2137 2138 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2139 nbrt = LIST_NEXT(brt, brt_list); 2140 if (brt->brt_ifp == ifp) 2141 bridge_rtnode_destroy(sc, brt); 2142 } 2143 2144 mutex_exit(sc->sc_rtlist_lock); 2145 } 2146 2147 /* 2148 * bridge_rtable_init: 2149 * 2150 * Initialize the route table for this bridge. 2151 */ 2152 static int 2153 bridge_rtable_init(struct bridge_softc *sc) 2154 { 2155 int i; 2156 2157 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2158 M_DEVBUF, M_NOWAIT); 2159 if (sc->sc_rthash == NULL) 2160 return (ENOMEM); 2161 2162 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2163 LIST_INIT(&sc->sc_rthash[i]); 2164 2165 sc->sc_rthash_key = cprng_fast32(); 2166 2167 LIST_INIT(&sc->sc_rtlist); 2168 2169 sc->sc_rtlist_lock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NET); 2170 2171 return (0); 2172 } 2173 2174 /* 2175 * bridge_rtable_fini: 2176 * 2177 * Deconstruct the route table for this bridge. 2178 */ 2179 static void 2180 bridge_rtable_fini(struct bridge_softc *sc) 2181 { 2182 2183 free(sc->sc_rthash, M_DEVBUF); 2184 if (sc->sc_rtlist_lock) 2185 mutex_obj_free(sc->sc_rtlist_lock); 2186 } 2187 2188 /* 2189 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2190 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2191 */ 2192 #define mix(a, b, c) \ 2193 do { \ 2194 a -= b; a -= c; a ^= (c >> 13); \ 2195 b -= c; b -= a; b ^= (a << 8); \ 2196 c -= a; c -= b; c ^= (b >> 13); \ 2197 a -= b; a -= c; a ^= (c >> 12); \ 2198 b -= c; b -= a; b ^= (a << 16); \ 2199 c -= a; c -= b; c ^= (b >> 5); \ 2200 a -= b; a -= c; a ^= (c >> 3); \ 2201 b -= c; b -= a; b ^= (a << 10); \ 2202 c -= a; c -= b; c ^= (b >> 15); \ 2203 } while (/*CONSTCOND*/0) 2204 2205 static inline uint32_t 2206 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2207 { 2208 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2209 2210 b += addr[5] << 8; 2211 b += addr[4]; 2212 a += addr[3] << 24; 2213 a += addr[2] << 16; 2214 a += addr[1] << 8; 2215 a += addr[0]; 2216 2217 mix(a, b, c); 2218 2219 return (c & BRIDGE_RTHASH_MASK); 2220 } 2221 2222 #undef mix 2223 2224 /* 2225 * bridge_rtnode_lookup: 2226 * 2227 * Look up a bridge route node for the specified destination. 2228 */ 2229 static struct bridge_rtnode * 2230 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2231 { 2232 struct bridge_rtnode *brt; 2233 uint32_t hash; 2234 int dir; 2235 2236 KASSERT(mutex_owned(sc->sc_rtlist_lock)); 2237 2238 hash = bridge_rthash(sc, addr); 2239 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2240 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2241 if (dir == 0) 2242 return (brt); 2243 if (dir > 0) 2244 return (NULL); 2245 } 2246 2247 return (NULL); 2248 } 2249 2250 /* 2251 * bridge_rtnode_insert: 2252 * 2253 * Insert the specified bridge node into the route table. We 2254 * assume the entry is not already in the table. 2255 */ 2256 static int 2257 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2258 { 2259 struct bridge_rtnode *lbrt; 2260 uint32_t hash; 2261 int dir; 2262 2263 KASSERT(mutex_owned(sc->sc_rtlist_lock)); 2264 2265 hash = bridge_rthash(sc, brt->brt_addr); 2266 2267 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2268 if (lbrt == NULL) { 2269 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2270 goto out; 2271 } 2272 2273 do { 2274 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2275 if (dir == 0) 2276 return (EEXIST); 2277 if (dir > 0) { 2278 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2279 goto out; 2280 } 2281 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2282 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2283 goto out; 2284 } 2285 lbrt = LIST_NEXT(lbrt, brt_hash); 2286 } while (lbrt != NULL); 2287 2288 #ifdef DIAGNOSTIC 2289 panic("bridge_rtnode_insert: impossible"); 2290 #endif 2291 2292 out: 2293 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2294 sc->sc_brtcnt++; 2295 2296 return (0); 2297 } 2298 2299 /* 2300 * bridge_rtnode_destroy: 2301 * 2302 * Destroy a bridge rtnode. 2303 */ 2304 static void 2305 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2306 { 2307 2308 KASSERT(mutex_owned(sc->sc_rtlist_lock)); 2309 2310 LIST_REMOVE(brt, brt_hash); 2311 2312 LIST_REMOVE(brt, brt_list); 2313 sc->sc_brtcnt--; 2314 pool_put(&bridge_rtnode_pool, brt); 2315 } 2316 2317 #if defined(BRIDGE_IPF) 2318 extern pfil_head_t *inet_pfil_hook; /* XXX */ 2319 extern pfil_head_t *inet6_pfil_hook; /* XXX */ 2320 2321 /* 2322 * Send bridge packets through IPF if they are one of the types IPF can deal 2323 * with, or if they are ARP or REVARP. (IPF will pass ARP and REVARP without 2324 * question.) 2325 */ 2326 static int 2327 bridge_ipf(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 2328 { 2329 int snap, error; 2330 struct ether_header *eh1, eh2; 2331 struct llc llc1; 2332 uint16_t ether_type; 2333 2334 snap = 0; 2335 error = -1; /* Default error if not error == 0 */ 2336 eh1 = mtod(*mp, struct ether_header *); 2337 ether_type = ntohs(eh1->ether_type); 2338 2339 /* 2340 * Check for SNAP/LLC. 2341 */ 2342 if (ether_type < ETHERMTU) { 2343 struct llc *llc2 = (struct llc *)(eh1 + 1); 2344 2345 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2346 llc2->llc_dsap == LLC_SNAP_LSAP && 2347 llc2->llc_ssap == LLC_SNAP_LSAP && 2348 llc2->llc_control == LLC_UI) { 2349 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2350 snap = 1; 2351 } 2352 } 2353 2354 /* 2355 * If we're trying to filter bridge traffic, don't look at anything 2356 * other than IP and ARP traffic. If the filter doesn't understand 2357 * IPv6, don't allow IPv6 through the bridge either. This is lame 2358 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2359 * but of course we don't have an AppleTalk filter to begin with. 2360 * (Note that since IPF doesn't understand ARP it will pass *ALL* 2361 * ARP traffic.) 2362 */ 2363 switch (ether_type) { 2364 case ETHERTYPE_ARP: 2365 case ETHERTYPE_REVARP: 2366 return 0; /* Automatically pass */ 2367 case ETHERTYPE_IP: 2368 # ifdef INET6 2369 case ETHERTYPE_IPV6: 2370 # endif /* INET6 */ 2371 break; 2372 default: 2373 goto bad; 2374 } 2375 2376 /* Strip off the Ethernet header and keep a copy. */ 2377 m_copydata(*mp, 0, ETHER_HDR_LEN, (void *) &eh2); 2378 m_adj(*mp, ETHER_HDR_LEN); 2379 2380 /* Strip off snap header, if present */ 2381 if (snap) { 2382 m_copydata(*mp, 0, sizeof(struct llc), (void *) &llc1); 2383 m_adj(*mp, sizeof(struct llc)); 2384 } 2385 2386 /* 2387 * Check basic packet sanity and run IPF through pfil. 2388 */ 2389 KASSERT(!cpu_intr_p()); 2390 switch (ether_type) 2391 { 2392 case ETHERTYPE_IP : 2393 error = (dir == PFIL_IN) ? bridge_ip_checkbasic(mp) : 0; 2394 if (error == 0) 2395 error = pfil_run_hooks(inet_pfil_hook, mp, ifp, dir); 2396 break; 2397 # ifdef INET6 2398 case ETHERTYPE_IPV6 : 2399 error = (dir == PFIL_IN) ? bridge_ip6_checkbasic(mp) : 0; 2400 if (error == 0) 2401 error = pfil_run_hooks(inet6_pfil_hook, mp, ifp, dir); 2402 break; 2403 # endif 2404 default : 2405 error = 0; 2406 break; 2407 } 2408 2409 if (*mp == NULL) 2410 return error; 2411 if (error != 0) 2412 goto bad; 2413 2414 error = -1; 2415 2416 /* 2417 * Finally, put everything back the way it was and return 2418 */ 2419 if (snap) { 2420 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2421 if (*mp == NULL) 2422 return error; 2423 bcopy(&llc1, mtod(*mp, void *), sizeof(struct llc)); 2424 } 2425 2426 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2427 if (*mp == NULL) 2428 return error; 2429 bcopy(&eh2, mtod(*mp, void *), ETHER_HDR_LEN); 2430 2431 return 0; 2432 2433 bad: 2434 m_freem(*mp); 2435 *mp = NULL; 2436 return error; 2437 } 2438 2439 /* 2440 * Perform basic checks on header size since 2441 * IPF assumes ip_input has already processed 2442 * it for it. Cut-and-pasted from ip_input.c. 2443 * Given how simple the IPv6 version is, 2444 * does the IPv4 version really need to be 2445 * this complicated? 2446 * 2447 * XXX Should we update ipstat here, or not? 2448 * XXX Right now we update ipstat but not 2449 * XXX csum_counter. 2450 */ 2451 static int 2452 bridge_ip_checkbasic(struct mbuf **mp) 2453 { 2454 struct mbuf *m = *mp; 2455 struct ip *ip; 2456 int len, hlen; 2457 2458 if (*mp == NULL) 2459 return -1; 2460 2461 if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2462 if ((m = m_copyup(m, sizeof(struct ip), 2463 (max_linkhdr + 3) & ~3)) == NULL) { 2464 /* XXXJRT new stat, please */ 2465 ip_statinc(IP_STAT_TOOSMALL); 2466 goto bad; 2467 } 2468 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2469 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2470 ip_statinc(IP_STAT_TOOSMALL); 2471 goto bad; 2472 } 2473 } 2474 ip = mtod(m, struct ip *); 2475 if (ip == NULL) goto bad; 2476 2477 if (ip->ip_v != IPVERSION) { 2478 ip_statinc(IP_STAT_BADVERS); 2479 goto bad; 2480 } 2481 hlen = ip->ip_hl << 2; 2482 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2483 ip_statinc(IP_STAT_BADHLEN); 2484 goto bad; 2485 } 2486 if (hlen > m->m_len) { 2487 if ((m = m_pullup(m, hlen)) == 0) { 2488 ip_statinc(IP_STAT_BADHLEN); 2489 goto bad; 2490 } 2491 ip = mtod(m, struct ip *); 2492 if (ip == NULL) goto bad; 2493 } 2494 2495 switch (m->m_pkthdr.csum_flags & 2496 ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) | 2497 M_CSUM_IPv4_BAD)) { 2498 case M_CSUM_IPv4|M_CSUM_IPv4_BAD: 2499 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); */ 2500 goto bad; 2501 2502 case M_CSUM_IPv4: 2503 /* Checksum was okay. */ 2504 /* INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); */ 2505 break; 2506 2507 default: 2508 /* Must compute it ourselves. */ 2509 /* INET_CSUM_COUNTER_INCR(&ip_swcsum); */ 2510 if (in_cksum(m, hlen) != 0) 2511 goto bad; 2512 break; 2513 } 2514 2515 /* Retrieve the packet length. */ 2516 len = ntohs(ip->ip_len); 2517 2518 /* 2519 * Check for additional length bogosity 2520 */ 2521 if (len < hlen) { 2522 ip_statinc(IP_STAT_BADLEN); 2523 goto bad; 2524 } 2525 2526 /* 2527 * Check that the amount of data in the buffers 2528 * is as at least much as the IP header would have us expect. 2529 * Drop packet if shorter than we expect. 2530 */ 2531 if (m->m_pkthdr.len < len) { 2532 ip_statinc(IP_STAT_TOOSHORT); 2533 goto bad; 2534 } 2535 2536 /* Checks out, proceed */ 2537 *mp = m; 2538 return 0; 2539 2540 bad: 2541 *mp = m; 2542 return -1; 2543 } 2544 2545 # ifdef INET6 2546 /* 2547 * Same as above, but for IPv6. 2548 * Cut-and-pasted from ip6_input.c. 2549 * XXX Should we update ip6stat, or not? 2550 */ 2551 static int 2552 bridge_ip6_checkbasic(struct mbuf **mp) 2553 { 2554 struct mbuf *m = *mp; 2555 struct ip6_hdr *ip6; 2556 2557 /* 2558 * If the IPv6 header is not aligned, slurp it up into a new 2559 * mbuf with space for link headers, in the event we forward 2560 * it. Otherwise, if it is aligned, make sure the entire base 2561 * IPv6 header is in the first mbuf of the chain. 2562 */ 2563 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 2564 struct ifnet *inifp = m->m_pkthdr.rcvif; 2565 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2566 (max_linkhdr + 3) & ~3)) == NULL) { 2567 /* XXXJRT new stat, please */ 2568 ip6_statinc(IP6_STAT_TOOSMALL); 2569 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2570 goto bad; 2571 } 2572 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2573 struct ifnet *inifp = m->m_pkthdr.rcvif; 2574 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2575 ip6_statinc(IP6_STAT_TOOSMALL); 2576 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2577 goto bad; 2578 } 2579 } 2580 2581 ip6 = mtod(m, struct ip6_hdr *); 2582 2583 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2584 ip6_statinc(IP6_STAT_BADVERS); 2585 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 2586 goto bad; 2587 } 2588 2589 /* Checks out, proceed */ 2590 *mp = m; 2591 return 0; 2592 2593 bad: 2594 *mp = m; 2595 return -1; 2596 } 2597 # endif /* INET6 */ 2598 #endif /* BRIDGE_IPF */ 2599
Indexes created Mon Sep 22 13:09:51 GMT 2025