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sys/net/if_bridge.c
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1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc 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@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 __FBSDID("$FreeBSD: src/sys/net/if_bridge.c,v 1.23.2.12 2006/04/02 23:55:05 thompsa Exp $"); 84 85 #include "opt_inet.h" 86 #include "opt_inet6.h" 87 88 #include <sys/param.h> 89 #include <sys/mbuf.h> 90 #include <sys/malloc.h> 91 #include <sys/protosw.h> 92 #include <sys/systm.h> 93 #include <sys/time.h> 94 #include <sys/socket.h> /* for net/if.h */ 95 #include <sys/sockio.h> 96 #include <sys/ctype.h> /* string functions */ 97 #include <sys/kernel.h> 98 #include <sys/random.h> 99 #include <sys/sysctl.h> 100 #include <vm/uma.h> 101 #include <sys/module.h> 102 #include <sys/proc.h> 103 #include <sys/lock.h> 104 #include <sys/mutex.h> 105 106 #include <net/bpf.h> 107 #include <net/if.h> 108 #include <net/if_clone.h> 109 #include <net/if_dl.h> 110 #include <net/if_types.h> 111 #include <net/if_var.h> 112 #include <net/pfil.h> 113 114 #include <netinet/in.h> /* for struct arpcom */ 115 #include <netinet/in_systm.h> 116 #include <netinet/in_var.h> 117 #include <netinet/ip.h> 118 #include <netinet/ip_var.h> 119 #ifdef INET6 120 #include <netinet/ip6.h> 121 #include <netinet6/ip6_var.h> 122 #endif 123 #include <machine/in_cksum.h> 124 #include <netinet/if_ether.h> /* for struct arpcom */ 125 #include <net/if_bridgevar.h> 126 #include <net/if_llc.h> 127 128 #include <net/route.h> 129 #include <netinet/ip_fw.h> 130 #include <netinet/ip_dummynet.h> 131 132 #define sc_if ifb_ac.ac_if 133 /* 134 * Size of the route hash table. Must be a power of two. 135 */ 136 #ifndef BRIDGE_RTHASH_SIZE 137 #define BRIDGE_RTHASH_SIZE 1024 138 #endif 139 140 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 141 142 /* 143 * Maximum number of addresses to cache. 144 */ 145 #ifndef BRIDGE_RTABLE_MAX 146 #define BRIDGE_RTABLE_MAX 100 147 #endif 148 149 /* 150 * Spanning tree defaults. 151 */ 152 #define BSTP_DEFAULT_MAX_AGE (20 * 256) 153 #define BSTP_DEFAULT_HELLO_TIME (2 * 256) 154 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) 155 #define BSTP_DEFAULT_HOLD_TIME (1 * 256) 156 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 157 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 158 #define BSTP_DEFAULT_PATH_COST 55 159 160 /* 161 * Timeout (in seconds) for entries learned dynamically. 162 */ 163 #ifndef BRIDGE_RTABLE_TIMEOUT 164 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 165 #endif 166 167 /* 168 * Number of seconds between walks of the route list. 169 */ 170 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 171 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 172 #endif 173 174 /* 175 * List of capabilities to mask on the member interface. 176 */ 177 #define BRIDGE_IFCAPS_MASK IFCAP_TXCSUM 178 179 static struct mtx bridge_list_mtx; 180 eventhandler_tag bridge_detach_cookie = NULL; 181 182 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 183 184 uma_zone_t bridge_rtnode_zone; 185 186 static int bridge_clone_create(struct if_clone *, int); 187 static void bridge_clone_destroy(struct ifnet *); 188 189 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 190 static void bridge_mutecaps(struct bridge_iflist *, int); 191 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 192 static void bridge_init(void *); 193 static void bridge_dummynet(struct mbuf *, struct ifnet *); 194 static void bridge_stop(struct ifnet *, int); 195 static void bridge_start(struct ifnet *); 196 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 197 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 198 struct rtentry *); 199 200 static void bridge_forward(struct bridge_softc *, struct mbuf *m); 201 202 static void bridge_timer(void *); 203 204 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 205 struct mbuf *, int); 206 static void bridge_span(struct bridge_softc *, struct mbuf *); 207 208 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 209 struct ifnet *, int, uint8_t); 210 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 211 static void bridge_rttrim(struct bridge_softc *); 212 static void bridge_rtage(struct bridge_softc *); 213 static void bridge_rtflush(struct bridge_softc *, int); 214 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 215 216 static int bridge_rtable_init(struct bridge_softc *); 217 static void bridge_rtable_fini(struct bridge_softc *); 218 219 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 220 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 221 const uint8_t *); 222 static int bridge_rtnode_insert(struct bridge_softc *, 223 struct bridge_rtnode *); 224 static void bridge_rtnode_destroy(struct bridge_softc *, 225 struct bridge_rtnode *); 226 227 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 228 const char *name); 229 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 230 struct ifnet *ifp); 231 static void bridge_delete_member(struct bridge_softc *, 232 struct bridge_iflist *, int); 233 static void bridge_delete_span(struct bridge_softc *, 234 struct bridge_iflist *); 235 236 static int bridge_ioctl_add(struct bridge_softc *, void *); 237 static int bridge_ioctl_del(struct bridge_softc *, void *); 238 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 239 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 240 static int bridge_ioctl_scache(struct bridge_softc *, void *); 241 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 242 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 243 static int bridge_ioctl_rts(struct bridge_softc *, void *); 244 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 245 static int bridge_ioctl_sto(struct bridge_softc *, void *); 246 static int bridge_ioctl_gto(struct bridge_softc *, void *); 247 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 248 static int bridge_ioctl_flush(struct bridge_softc *, void *); 249 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 250 static int bridge_ioctl_spri(struct bridge_softc *, void *); 251 static int bridge_ioctl_ght(struct bridge_softc *, void *); 252 static int bridge_ioctl_sht(struct bridge_softc *, void *); 253 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 254 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 255 static int bridge_ioctl_gma(struct bridge_softc *, void *); 256 static int bridge_ioctl_sma(struct bridge_softc *, void *); 257 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 258 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 259 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 260 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 261 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 262 int); 263 static int bridge_ip_checkbasic(struct mbuf **mp); 264 # ifdef INET6 265 static int bridge_ip6_checkbasic(struct mbuf **mp); 266 # endif /* INET6 */ 267 268 SYSCTL_DECL(_net_link); 269 SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 270 271 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */ 272 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */ 273 static int pfil_member = 1; /* run pfil hooks on the member interface */ 274 static int pfil_ipfw = 0; /* layer2 filter with ipfw */ 275 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW, 276 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled"); 277 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW, 278 &pfil_bridge, 0, "Packet filter on the bridge interface"); 279 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW, 280 &pfil_member, 0, "Packet filter on the member interface"); 281 282 struct bridge_control { 283 int (*bc_func)(struct bridge_softc *, void *); 284 int bc_argsize; 285 int bc_flags; 286 }; 287 288 #define BC_F_COPYIN 0x01 /* copy arguments in */ 289 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 290 #define BC_F_SUSER 0x04 /* do super-user check */ 291 292 const struct bridge_control bridge_control_table[] = { 293 { bridge_ioctl_add, sizeof(struct ifbreq), 294 BC_F_COPYIN|BC_F_SUSER }, 295 { bridge_ioctl_del, sizeof(struct ifbreq), 296 BC_F_COPYIN|BC_F_SUSER }, 297 298 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 299 BC_F_COPYIN|BC_F_COPYOUT }, 300 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 301 BC_F_COPYIN|BC_F_SUSER }, 302 303 { bridge_ioctl_scache, sizeof(struct ifbrparam), 304 BC_F_COPYIN|BC_F_SUSER }, 305 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 306 BC_F_COPYOUT }, 307 308 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 309 BC_F_COPYIN|BC_F_COPYOUT }, 310 { bridge_ioctl_rts, sizeof(struct ifbaconf), 311 BC_F_COPYIN|BC_F_COPYOUT }, 312 313 { bridge_ioctl_saddr, sizeof(struct ifbareq), 314 BC_F_COPYIN|BC_F_SUSER }, 315 316 { bridge_ioctl_sto, sizeof(struct ifbrparam), 317 BC_F_COPYIN|BC_F_SUSER }, 318 { bridge_ioctl_gto, sizeof(struct ifbrparam), 319 BC_F_COPYOUT }, 320 321 { bridge_ioctl_daddr, sizeof(struct ifbareq), 322 BC_F_COPYIN|BC_F_SUSER }, 323 324 { bridge_ioctl_flush, sizeof(struct ifbreq), 325 BC_F_COPYIN|BC_F_SUSER }, 326 327 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 328 BC_F_COPYOUT }, 329 { bridge_ioctl_spri, sizeof(struct ifbrparam), 330 BC_F_COPYIN|BC_F_SUSER }, 331 332 { bridge_ioctl_ght, sizeof(struct ifbrparam), 333 BC_F_COPYOUT }, 334 { bridge_ioctl_sht, sizeof(struct ifbrparam), 335 BC_F_COPYIN|BC_F_SUSER }, 336 337 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 338 BC_F_COPYOUT }, 339 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 340 BC_F_COPYIN|BC_F_SUSER }, 341 342 { bridge_ioctl_gma, sizeof(struct ifbrparam), 343 BC_F_COPYOUT }, 344 { bridge_ioctl_sma, sizeof(struct ifbrparam), 345 BC_F_COPYIN|BC_F_SUSER }, 346 347 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 348 BC_F_COPYIN|BC_F_SUSER }, 349 350 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 351 BC_F_COPYIN|BC_F_SUSER }, 352 353 { bridge_ioctl_addspan, sizeof(struct ifbreq), 354 BC_F_COPYIN|BC_F_SUSER }, 355 { bridge_ioctl_delspan, sizeof(struct ifbreq), 356 BC_F_COPYIN|BC_F_SUSER }, 357 }; 358 const int bridge_control_table_size = 359 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 360 361 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] = 362 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 363 364 LIST_HEAD(, bridge_softc) bridge_list; 365 366 IFC_SIMPLE_DECLARE(bridge, 0); 367 368 static int 369 bridge_modevent(module_t mod, int type, void *data) 370 { 371 372 switch (type) { 373 case MOD_LOAD: 374 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF); 375 if_clone_attach(&bridge_cloner); 376 bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 377 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 378 UMA_ALIGN_PTR, 0); 379 LIST_INIT(&bridge_list); 380 bridge_input_p = bridge_input; 381 bridge_output_p = bridge_output; 382 bridge_dn_p = bridge_dummynet; 383 bridge_detach_cookie = EVENTHANDLER_REGISTER( 384 ifnet_departure_event, bridge_ifdetach, NULL, 385 EVENTHANDLER_PRI_ANY); 386 break; 387 case MOD_UNLOAD: 388 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 389 bridge_detach_cookie); 390 if_clone_detach(&bridge_cloner); 391 while (!LIST_EMPTY(&bridge_list)) 392 bridge_clone_destroy(&LIST_FIRST(&bridge_list)->sc_if); 393 uma_zdestroy(bridge_rtnode_zone); 394 bridge_input_p = NULL; 395 bridge_output_p = NULL; 396 bridge_dn_p = NULL; 397 mtx_destroy(&bridge_list_mtx); 398 break; 399 default: 400 return EOPNOTSUPP; 401 } 402 return 0; 403 } 404 405 static moduledata_t bridge_mod = { 406 "if_bridge", 407 bridge_modevent, 408 0 409 }; 410 411 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 412 413 /* 414 * handler for net.link.bridge.pfil_ipfw 415 */ 416 static int 417 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 418 { 419 int enable = pfil_ipfw; 420 int error; 421 422 error = sysctl_handle_int(oidp, &enable, 0, req); 423 enable = (enable) ? 1 : 0; 424 425 if (enable != pfil_ipfw) { 426 pfil_ipfw = enable; 427 428 /* 429 * Disable pfil so that ipfw doesnt run twice, if the user 430 * really wants both then they can re-enable pfil_bridge and/or 431 * pfil_member. Also allow non-ip packets as ipfw can filter by 432 * layer2 type. 433 */ 434 if (pfil_ipfw) { 435 pfil_onlyip = 0; 436 pfil_bridge = 0; 437 pfil_member = 0; 438 } 439 } 440 441 return error; 442 } 443 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW, 444 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW"); 445 446 /* 447 * bridge_clone_create: 448 * 449 * Create a new bridge instance. 450 */ 451 static int 452 bridge_clone_create(struct if_clone *ifc, int unit) 453 { 454 struct bridge_softc *sc; 455 struct ifnet *ifp; 456 457 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 458 BRIDGE_LOCK_INIT(sc); 459 ifp = &sc->sc_if; 460 461 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 462 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 463 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 464 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 465 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 466 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 467 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 468 469 /* Initialize our routing table. */ 470 bridge_rtable_init(sc); 471 472 callout_init(&sc->sc_brcallout, debug_mpsafenet ? CALLOUT_MPSAFE : 0); 473 callout_init(&sc->sc_bstpcallout, debug_mpsafenet ? CALLOUT_MPSAFE : 0); 474 475 LIST_INIT(&sc->sc_iflist); 476 LIST_INIT(&sc->sc_spanlist); 477 478 ifp->if_softc = sc; 479 if_initname(ifp, ifc->ifc_name, unit); 480 ifp->if_mtu = ETHERMTU; 481 ifp->if_flags = IFF_BROADCAST | IFF_MULTICAST; 482 ifp->if_ioctl = bridge_ioctl; 483 ifp->if_output = bridge_output; 484 ifp->if_start = bridge_start; 485 ifp->if_init = bridge_init; 486 ifp->if_type = IFT_BRIDGE; 487 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 488 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 489 IFQ_SET_READY(&ifp->if_snd); 490 ifp->if_hdrlen = ETHER_HDR_LEN; 491 492 /* 493 * Generate a random ethernet address and use the private AC:DE:48 494 * OUI code. 495 */ 496 arc4rand( &sc->ifb_ac.ac_enaddr, ETHER_ADDR_LEN, 1); 497 sc->ifb_ac.ac_enaddr[0] = 0xAC; 498 sc->ifb_ac.ac_enaddr[1] = 0xDE; 499 sc->ifb_ac.ac_enaddr[2] = 0x48; 500 501 ether_ifattach(ifp, sc->ifb_ac.ac_enaddr); 502 /* Now undo some of the damage... */ 503 ifp->if_baudrate = 0; 504 ifp->if_type = IFT_BRIDGE; 505 506 mtx_lock(&bridge_list_mtx); 507 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 508 mtx_unlock(&bridge_list_mtx); 509 510 return (0); 511 } 512 513 /* 514 * bridge_clone_destroy: 515 * 516 * Destroy a bridge instance. 517 */ 518 static void 519 bridge_clone_destroy(struct ifnet *ifp) 520 { 521 struct bridge_softc *sc = ifp->if_softc; 522 struct bridge_iflist *bif; 523 524 BRIDGE_LOCK(sc); 525 526 bridge_stop(ifp, 1); 527 ifp->if_flags &= ~IFF_UP; 528 529 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 530 bridge_delete_member(sc, bif, 0); 531 532 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 533 bridge_delete_span(sc, bif); 534 } 535 536 BRIDGE_UNLOCK(sc); 537 538 mtx_lock(&bridge_list_mtx); 539 LIST_REMOVE(sc, sc_list); 540 mtx_unlock(&bridge_list_mtx); 541 542 ether_ifdetach(ifp); 543 544 /* Tear down the routing table. */ 545 bridge_rtable_fini(sc); 546 547 BRIDGE_LOCK_DESTROY(sc); 548 free(sc, M_DEVBUF); 549 } 550 551 /* 552 * bridge_ioctl: 553 * 554 * Handle a control request from the operator. 555 */ 556 static int 557 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 558 { 559 struct bridge_softc *sc = ifp->if_softc; 560 struct thread *td = curthread; 561 union { 562 struct ifbreq ifbreq; 563 struct ifbifconf ifbifconf; 564 struct ifbareq ifbareq; 565 struct ifbaconf ifbaconf; 566 struct ifbrparam ifbrparam; 567 } args; 568 struct ifdrv *ifd = (struct ifdrv *) data; 569 const struct bridge_control *bc; 570 int error = 0; 571 572 BRIDGE_LOCK(sc); 573 574 switch (cmd) { 575 576 case SIOCADDMULTI: 577 case SIOCDELMULTI: 578 break; 579 580 case SIOCGDRVSPEC: 581 case SIOCSDRVSPEC: 582 if (ifd->ifd_cmd >= bridge_control_table_size) { 583 error = EINVAL; 584 break; 585 } 586 bc = &bridge_control_table[ifd->ifd_cmd]; 587 588 if (cmd == SIOCGDRVSPEC && 589 (bc->bc_flags & BC_F_COPYOUT) == 0) { 590 error = EINVAL; 591 break; 592 } 593 else if (cmd == SIOCSDRVSPEC && 594 (bc->bc_flags & BC_F_COPYOUT) != 0) { 595 error = EINVAL; 596 break; 597 } 598 599 if (bc->bc_flags & BC_F_SUSER) { 600 error = suser(td); 601 if (error) 602 break; 603 } 604 605 if (ifd->ifd_len != bc->bc_argsize || 606 ifd->ifd_len > sizeof(args)) { 607 error = EINVAL; 608 break; 609 } 610 611 bzero(&args, sizeof args); 612 if (bc->bc_flags & BC_F_COPYIN) { 613 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 614 if (error) 615 break; 616 } 617 618 error = (*bc->bc_func)(sc, &args); 619 if (error) 620 break; 621 622 if (bc->bc_flags & BC_F_COPYOUT) 623 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 624 625 break; 626 627 case SIOCSIFFLAGS: 628 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_RUNNING) { 629 /* 630 * If interface is marked down and it is running, 631 * then stop and disable it. 632 */ 633 bridge_stop(ifp, 1); 634 } else if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == IFF_UP) { 635 /* 636 * If interface is marked up and it is stopped, then 637 * start it. 638 */ 639 BRIDGE_UNLOCK(sc); 640 (*ifp->if_init)(sc); 641 } 642 break; 643 644 case SIOCSIFMTU: 645 /* Do not allow the MTU to be changed on the bridge */ 646 error = EINVAL; 647 break; 648 649 default: 650 /* 651 * drop the lock as ether_ioctl() will call bridge_start() and 652 * cause the lock to be recursed. 653 */ 654 BRIDGE_UNLOCK(sc); 655 error = ether_ioctl(ifp, cmd, data); 656 break; 657 } 658 659 if (BRIDGE_LOCKED(sc)) 660 BRIDGE_UNLOCK(sc); 661 662 return (error); 663 } 664 665 /* 666 * bridge_mutecaps: 667 * 668 * Clear or restore unwanted capabilities on the member interface 669 */ 670 static void 671 bridge_mutecaps(struct bridge_iflist *bif, int mute) 672 { 673 struct ifnet *ifp = bif->bif_ifp; 674 struct ifreq ifr; 675 int error; 676 677 if (ifp->if_ioctl == NULL) 678 return; 679 680 bzero(&ifr, sizeof ifr); 681 ifr.ifr_reqcap = ifp->if_capenable; 682 683 if (mute) { 684 /* mask off and save capabilities */ 685 bif->bif_mutecap = ifr.ifr_reqcap & BRIDGE_IFCAPS_MASK; 686 if (bif->bif_mutecap != 0) 687 ifr.ifr_reqcap &= ~BRIDGE_IFCAPS_MASK; 688 } else 689 /* restore muted capabilities */ 690 ifr.ifr_reqcap |= bif->bif_mutecap; 691 692 693 if (bif->bif_mutecap != 0) { 694 IFF_LOCKGIANT(ifp); 695 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 696 IFF_UNLOCKGIANT(ifp); 697 } 698 } 699 700 701 /* 702 * bridge_lookup_member: 703 * 704 * Lookup a bridge member interface. 705 */ 706 static struct bridge_iflist * 707 bridge_lookup_member(struct bridge_softc *sc, const char *name) 708 { 709 struct bridge_iflist *bif; 710 struct ifnet *ifp; 711 712 BRIDGE_LOCK_ASSERT(sc); 713 714 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 715 ifp = bif->bif_ifp; 716 if (strcmp(ifp->if_xname, name) == 0) 717 return (bif); 718 } 719 720 return (NULL); 721 } 722 723 /* 724 * bridge_lookup_member_if: 725 * 726 * Lookup a bridge member interface by ifnet*. 727 */ 728 static struct bridge_iflist * 729 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 730 { 731 struct bridge_iflist *bif; 732 733 BRIDGE_LOCK_ASSERT(sc); 734 735 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 736 if (bif->bif_ifp == member_ifp) 737 return (bif); 738 } 739 740 return (NULL); 741 } 742 743 /* 744 * bridge_delete_member: 745 * 746 * Delete the specified member interface. 747 */ 748 static void 749 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 750 int gone) 751 { 752 struct ifnet *ifs = bif->bif_ifp; 753 754 BRIDGE_LOCK_ASSERT(sc); 755 756 if (!gone) { 757 switch (ifs->if_type) { 758 case IFT_ETHER: 759 case IFT_L2VLAN: 760 /* 761 * Take the interface out of promiscuous mode. 762 */ 763 (void) ifpromisc(ifs, 0); 764 bridge_mutecaps(bif, 0); 765 break; 766 767 default: 768 #ifdef DIAGNOSTIC 769 panic("bridge_delete_member: impossible"); 770 #endif 771 break; 772 } 773 } 774 775 ifs->if_bridge = NULL; 776 BRIDGE_XLOCK(sc); 777 LIST_REMOVE(bif, bif_next); 778 BRIDGE_XDROP(sc); 779 780 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 781 782 free(bif, M_DEVBUF); 783 784 if (sc->sc_if.if_flags & IFF_RUNNING) 785 bstp_initialization(sc); 786 } 787 788 /* 789 * bridge_delete_span: 790 * 791 * Delete the specified span interface. 792 */ 793 static void 794 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 795 { 796 BRIDGE_LOCK_ASSERT(sc); 797 798 KASSERT(bif->bif_ifp->if_bridge == NULL, 799 ("%s: not a span interface", __func__)); 800 801 LIST_REMOVE(bif, bif_next); 802 free(bif, M_DEVBUF); 803 } 804 805 static int 806 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 807 { 808 struct ifbreq *req = arg; 809 struct bridge_iflist *bif = NULL; 810 struct ifnet *ifs; 811 int error = 0; 812 813 BRIDGE_LOCK_ASSERT(sc); 814 815 ifs = ifunit(req->ifbr_ifsname); 816 if (ifs == NULL) 817 return (ENOENT); 818 819 /* If it's in the span list, it can't be a member. */ 820 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 821 if (ifs == bif->bif_ifp) 822 return (EBUSY); 823 824 /* Allow the first member to define the MTU */ 825 if (LIST_EMPTY(&sc->sc_iflist)) 826 sc->sc_if.if_mtu = ifs->if_mtu; 827 else if (sc->sc_if.if_mtu != ifs->if_mtu) { 828 if_printf(&sc->sc_if, "invalid MTU for %s\n", ifs->if_xname); 829 return (EINVAL); 830 } 831 832 if (ifs->if_bridge == sc) 833 return (EEXIST); 834 835 if (ifs->if_bridge != NULL) 836 return (EBUSY); 837 838 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 839 if (bif == NULL) 840 return (ENOMEM); 841 842 bif->bif_ifp = ifs; 843 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 844 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 845 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 846 847 switch (ifs->if_type) { 848 case IFT_ETHER: 849 case IFT_L2VLAN: 850 /* 851 * Place the interface into promiscuous mode. 852 */ 853 error = ifpromisc(ifs, 1); 854 if (error) 855 goto out; 856 857 bridge_mutecaps(bif, 1); 858 break; 859 860 default: 861 error = EINVAL; 862 goto out; 863 } 864 865 ifs->if_bridge = sc; 866 /* 867 * XXX: XLOCK HERE!?! 868 * 869 * NOTE: insert_***HEAD*** should be safe for the traversals. 870 */ 871 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 872 873 if (sc->sc_if.if_flags & IFF_RUNNING) 874 bstp_initialization(sc); 875 else 876 bstp_stop(sc); 877 878 out: 879 if (error) { 880 if (bif != NULL) 881 free(bif, M_DEVBUF); 882 } 883 return (error); 884 } 885 886 static int 887 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 888 { 889 struct ifbreq *req = arg; 890 struct bridge_iflist *bif; 891 892 BRIDGE_LOCK_ASSERT(sc); 893 894 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 895 if (bif == NULL) 896 return (ENOENT); 897 898 bridge_delete_member(sc, bif, 0); 899 900 return (0); 901 } 902 903 static int 904 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 905 { 906 struct ifbreq *req = arg; 907 struct bridge_iflist *bif; 908 909 BRIDGE_LOCK_ASSERT(sc); 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 return (0); 922 } 923 924 static int 925 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 926 { 927 struct ifbreq *req = arg; 928 struct bridge_iflist *bif; 929 930 BRIDGE_LOCK_ASSERT(sc); 931 932 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 933 if (bif == NULL) 934 return (ENOENT); 935 936 if (req->ifbr_ifsflags & IFBIF_SPAN) 937 /* SPAN is readonly */ 938 return (EINVAL); 939 940 if (req->ifbr_ifsflags & IFBIF_STP) { 941 switch (bif->bif_ifp->if_type) { 942 case IFT_ETHER: 943 /* These can do spanning tree. */ 944 break; 945 946 default: 947 /* Nothing else can. */ 948 return (EINVAL); 949 } 950 } 951 952 bif->bif_flags = req->ifbr_ifsflags; 953 954 if (sc->sc_if.if_flags & IFF_RUNNING) 955 bstp_initialization(sc); 956 957 return (0); 958 } 959 960 static int 961 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 962 { 963 struct ifbrparam *param = arg; 964 965 BRIDGE_LOCK_ASSERT(sc); 966 967 sc->sc_brtmax = param->ifbrp_csize; 968 bridge_rttrim(sc); 969 970 return (0); 971 } 972 973 static int 974 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 975 { 976 struct ifbrparam *param = arg; 977 978 BRIDGE_LOCK_ASSERT(sc); 979 980 param->ifbrp_csize = sc->sc_brtmax; 981 982 return (0); 983 } 984 985 static int 986 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 987 { 988 struct ifbifconf *bifc = arg; 989 struct bridge_iflist *bif; 990 struct ifbreq breq; 991 int count, len, error = 0; 992 993 BRIDGE_LOCK_ASSERT(sc); 994 995 count = 0; 996 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 997 count++; 998 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 999 count++; 1000 1001 if (bifc->ifbic_len == 0) { 1002 bifc->ifbic_len = sizeof(breq) * count; 1003 return (0); 1004 } 1005 1006 count = 0; 1007 len = bifc->ifbic_len; 1008 bzero(&breq, sizeof breq); 1009 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1010 if (len < sizeof(breq)) 1011 break; 1012 1013 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1014 sizeof(breq.ifbr_ifsname)); 1015 breq.ifbr_ifsflags = bif->bif_flags; 1016 breq.ifbr_state = bif->bif_state; 1017 breq.ifbr_priority = bif->bif_priority; 1018 breq.ifbr_path_cost = bif->bif_path_cost; 1019 breq.ifbr_portno = bif->bif_ifp->if_index & 0xff; 1020 error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq)); 1021 if (error) 1022 break; 1023 count++; 1024 len -= sizeof(breq); 1025 } 1026 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1027 if (len < sizeof(breq)) 1028 break; 1029 1030 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1031 sizeof(breq.ifbr_ifsname)); 1032 breq.ifbr_ifsflags = bif->bif_flags; 1033 breq.ifbr_state = bif->bif_state; 1034 breq.ifbr_priority = bif->bif_priority; 1035 breq.ifbr_path_cost = bif->bif_path_cost; 1036 breq.ifbr_portno = bif->bif_ifp->if_index & 0xff; 1037 error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq)); 1038 if (error) 1039 break; 1040 count++; 1041 len -= sizeof(breq); 1042 } 1043 1044 bifc->ifbic_len = sizeof(breq) * count; 1045 return (error); 1046 } 1047 1048 static int 1049 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1050 { 1051 struct ifbaconf *bac = arg; 1052 struct bridge_rtnode *brt; 1053 struct ifbareq bareq; 1054 int count = 0, error = 0, len; 1055 1056 BRIDGE_LOCK_ASSERT(sc); 1057 1058 if (bac->ifbac_len == 0) 1059 return (0); 1060 1061 len = bac->ifbac_len; 1062 bzero(&bareq, sizeof bareq); 1063 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1064 if (len < sizeof(bareq)) 1065 goto out; 1066 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1067 sizeof(bareq.ifba_ifsname)); 1068 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1069 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1070 time_uptime < brt->brt_expire) 1071 bareq.ifba_expire = brt->brt_expire - time_uptime; 1072 else 1073 bareq.ifba_expire = 0; 1074 bareq.ifba_flags = brt->brt_flags; 1075 1076 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1077 if (error) 1078 goto out; 1079 count++; 1080 len -= sizeof(bareq); 1081 } 1082 out: 1083 bac->ifbac_len = sizeof(bareq) * count; 1084 return (error); 1085 } 1086 1087 static int 1088 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1089 { 1090 struct ifbareq *req = arg; 1091 struct bridge_iflist *bif; 1092 int error; 1093 1094 BRIDGE_LOCK_ASSERT(sc); 1095 1096 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1097 if (bif == NULL) 1098 return (ENOENT); 1099 1100 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1101 req->ifba_flags); 1102 1103 return (error); 1104 } 1105 1106 static int 1107 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1108 { 1109 struct ifbrparam *param = arg; 1110 1111 BRIDGE_LOCK_ASSERT(sc); 1112 1113 sc->sc_brttimeout = param->ifbrp_ctime; 1114 1115 return (0); 1116 } 1117 1118 static int 1119 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1120 { 1121 struct ifbrparam *param = arg; 1122 1123 BRIDGE_LOCK_ASSERT(sc); 1124 1125 param->ifbrp_ctime = sc->sc_brttimeout; 1126 1127 return (0); 1128 } 1129 1130 static int 1131 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1132 { 1133 struct ifbareq *req = arg; 1134 1135 BRIDGE_LOCK_ASSERT(sc); 1136 1137 return (bridge_rtdaddr(sc, req->ifba_dst)); 1138 } 1139 1140 static int 1141 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1142 { 1143 struct ifbreq *req = arg; 1144 1145 BRIDGE_LOCK_ASSERT(sc); 1146 1147 bridge_rtflush(sc, req->ifbr_ifsflags); 1148 1149 return (0); 1150 } 1151 1152 static int 1153 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1154 { 1155 struct ifbrparam *param = arg; 1156 1157 BRIDGE_LOCK_ASSERT(sc); 1158 1159 param->ifbrp_prio = sc->sc_bridge_priority; 1160 1161 return (0); 1162 } 1163 1164 static int 1165 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1166 { 1167 struct ifbrparam *param = arg; 1168 1169 BRIDGE_LOCK_ASSERT(sc); 1170 1171 sc->sc_bridge_priority = param->ifbrp_prio; 1172 1173 if (sc->sc_if.if_flags & IFF_RUNNING) 1174 bstp_initialization(sc); 1175 1176 return (0); 1177 } 1178 1179 static int 1180 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1181 { 1182 struct ifbrparam *param = arg; 1183 1184 BRIDGE_LOCK_ASSERT(sc); 1185 1186 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1187 1188 return (0); 1189 } 1190 1191 static int 1192 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1193 { 1194 struct ifbrparam *param = arg; 1195 1196 BRIDGE_LOCK_ASSERT(sc); 1197 1198 if (param->ifbrp_hellotime == 0) 1199 return (EINVAL); 1200 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1201 1202 if (sc->sc_if.if_flags & IFF_RUNNING) 1203 bstp_initialization(sc); 1204 1205 return (0); 1206 } 1207 1208 static int 1209 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1210 { 1211 struct ifbrparam *param = arg; 1212 1213 BRIDGE_LOCK_ASSERT(sc); 1214 1215 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1216 1217 return (0); 1218 } 1219 1220 static int 1221 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1222 { 1223 struct ifbrparam *param = arg; 1224 1225 BRIDGE_LOCK_ASSERT(sc); 1226 1227 if (param->ifbrp_fwddelay == 0) 1228 return (EINVAL); 1229 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1230 1231 if (sc->sc_if.if_flags & IFF_RUNNING) 1232 bstp_initialization(sc); 1233 1234 return (0); 1235 } 1236 1237 static int 1238 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1239 { 1240 struct ifbrparam *param = arg; 1241 1242 BRIDGE_LOCK_ASSERT(sc); 1243 1244 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1245 1246 return (0); 1247 } 1248 1249 static int 1250 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1251 { 1252 struct ifbrparam *param = arg; 1253 1254 BRIDGE_LOCK_ASSERT(sc); 1255 1256 if (param->ifbrp_maxage == 0) 1257 return (EINVAL); 1258 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1259 1260 if (sc->sc_if.if_flags & IFF_RUNNING) 1261 bstp_initialization(sc); 1262 1263 return (0); 1264 } 1265 1266 static int 1267 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1268 { 1269 struct ifbreq *req = arg; 1270 struct bridge_iflist *bif; 1271 1272 BRIDGE_LOCK_ASSERT(sc); 1273 1274 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1275 if (bif == NULL) 1276 return (ENOENT); 1277 1278 bif->bif_priority = req->ifbr_priority; 1279 1280 if (sc->sc_if.if_flags & IFF_RUNNING) 1281 bstp_initialization(sc); 1282 1283 return (0); 1284 } 1285 1286 static int 1287 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1288 { 1289 struct ifbreq *req = arg; 1290 struct bridge_iflist *bif; 1291 1292 BRIDGE_LOCK_ASSERT(sc); 1293 1294 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1295 if (bif == NULL) 1296 return (ENOENT); 1297 1298 bif->bif_path_cost = req->ifbr_path_cost; 1299 1300 if (sc->sc_if.if_flags & IFF_RUNNING) 1301 bstp_initialization(sc); 1302 1303 return (0); 1304 } 1305 1306 static int 1307 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1308 { 1309 struct ifbreq *req = arg; 1310 struct bridge_iflist *bif = NULL; 1311 struct ifnet *ifs; 1312 1313 BRIDGE_LOCK_ASSERT(sc); 1314 1315 ifs = ifunit(req->ifbr_ifsname); 1316 if (ifs == NULL) 1317 return (ENOENT); 1318 1319 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1320 if (ifs == bif->bif_ifp) 1321 return (EBUSY); 1322 1323 if (ifs->if_bridge != NULL) 1324 return (EBUSY); 1325 1326 switch (ifs->if_type) { 1327 case IFT_ETHER: 1328 case IFT_L2VLAN: 1329 break; 1330 default: 1331 return (EINVAL); 1332 } 1333 1334 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1335 if (bif == NULL) 1336 return (ENOMEM); 1337 1338 bif->bif_ifp = ifs; 1339 bif->bif_flags = IFBIF_SPAN; 1340 1341 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1342 1343 return (0); 1344 } 1345 1346 static int 1347 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1348 { 1349 struct ifbreq *req = arg; 1350 struct bridge_iflist *bif; 1351 struct ifnet *ifs; 1352 1353 BRIDGE_LOCK_ASSERT(sc); 1354 1355 ifs = ifunit(req->ifbr_ifsname); 1356 if (ifs == NULL) 1357 return (ENOENT); 1358 1359 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1360 if (ifs == bif->bif_ifp) 1361 break; 1362 1363 if (bif == NULL) 1364 return (ENOENT); 1365 1366 bridge_delete_span(sc, bif); 1367 1368 return (0); 1369 } 1370 1371 /* 1372 * bridge_ifdetach: 1373 * 1374 * Detach an interface from a bridge. Called when a member 1375 * interface is detaching. 1376 */ 1377 static void 1378 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1379 { 1380 struct bridge_softc *sc = ifp->if_bridge; 1381 struct bridge_iflist *bif; 1382 1383 /* Check if the interface is a bridge member */ 1384 if (sc != NULL) { 1385 BRIDGE_LOCK(sc); 1386 1387 bif = bridge_lookup_member_if(sc, ifp); 1388 if (bif != NULL) 1389 bridge_delete_member(sc, bif, 1); 1390 1391 BRIDGE_UNLOCK(sc); 1392 return; 1393 } 1394 1395 /* Check if the interface is a span port */ 1396 mtx_lock(&bridge_list_mtx); 1397 LIST_FOREACH(sc, &bridge_list, sc_list) { 1398 BRIDGE_LOCK(sc); 1399 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1400 if (ifp == bif->bif_ifp) { 1401 bridge_delete_span(sc, bif); 1402 break; 1403 } 1404 1405 BRIDGE_UNLOCK(sc); 1406 } 1407 mtx_unlock(&bridge_list_mtx); 1408 } 1409 1410 /* 1411 * bridge_init: 1412 * 1413 * Initialize a bridge interface. 1414 */ 1415 static void 1416 bridge_init(void *xsc) 1417 { 1418 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1419 struct ifnet *ifp = &sc->sc_if; 1420 1421 if (ifp->if_flags & IFF_RUNNING) 1422 return; 1423 1424 BRIDGE_LOCK(sc); 1425 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1426 bridge_timer, sc); 1427 1428 ifp->if_flags |= IFF_RUNNING; 1429 bstp_initialization(sc); 1430 BRIDGE_UNLOCK(sc); 1431 return; 1432 } 1433 1434 /* 1435 * bridge_stop: 1436 * 1437 * Stop the bridge interface. 1438 */ 1439 static void 1440 bridge_stop(struct ifnet *ifp, int disable) 1441 { 1442 struct bridge_softc *sc = ifp->if_softc; 1443 1444 BRIDGE_LOCK_ASSERT(sc); 1445 1446 if ((ifp->if_flags & IFF_RUNNING) == 0) 1447 return; 1448 1449 callout_stop(&sc->sc_brcallout); 1450 bstp_stop(sc); 1451 1452 bridge_rtflush(sc, IFBF_FLUSHDYN); 1453 1454 ifp->if_flags &= ~IFF_RUNNING; 1455 } 1456 1457 /* 1458 * bridge_enqueue: 1459 * 1460 * Enqueue a packet on a bridge member interface. 1461 * 1462 */ 1463 __inline void 1464 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1465 { 1466 int len, err; 1467 short mflags; 1468 1469 len = m->m_pkthdr.len; 1470 mflags = m->m_flags; 1471 1472 IFQ_ENQUEUE(&dst_ifp->if_snd, m, err); 1473 if (err == 0) { 1474 1475 sc->sc_if.if_opackets++; 1476 sc->sc_if.if_obytes += len; 1477 1478 dst_ifp->if_obytes += len; 1479 1480 if (mflags & M_MCAST) { 1481 sc->sc_if.if_omcasts++; 1482 dst_ifp->if_omcasts++; 1483 } 1484 } 1485 1486 if ((dst_ifp->if_flags & IFF_OACTIVE) == 0) 1487 (*dst_ifp->if_start)(dst_ifp); 1488 } 1489 1490 /* 1491 * bridge_dummynet: 1492 * 1493 * Receive a queued packet from dummynet and pass it on to the output 1494 * interface. 1495 * 1496 * The mbuf has the Ethernet header already attached. 1497 */ 1498 static void 1499 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1500 { 1501 struct bridge_softc *sc; 1502 1503 sc = ifp->if_bridge; 1504 1505 /* 1506 * The packet didnt originate from a member interface. This should only 1507 * ever happen if a member interface is removed while packets are 1508 * queued for it. 1509 */ 1510 if (sc == NULL) { 1511 m_freem(m); 1512 return; 1513 } 1514 1515 if (inet_pfil_hook.ph_busy_count >= 0 1516 #ifdef INET6 1517 || inet6_pfil_hook.ph_busy_count >= 0 1518 #endif 1519 ) { 1520 if (bridge_pfil(&m, &sc->sc_if, ifp, PFIL_OUT) != 0) 1521 return; 1522 if (m == NULL) 1523 return; 1524 } 1525 1526 bridge_enqueue(sc, ifp, m); 1527 } 1528 1529 /* 1530 * bridge_output: 1531 * 1532 * Send output from a bridge member interface. This 1533 * performs the bridging function for locally originated 1534 * packets. 1535 * 1536 * The mbuf has the Ethernet header already attached. We must 1537 * enqueue or free the mbuf before returning. 1538 */ 1539 static int 1540 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1541 struct rtentry *rt) 1542 { 1543 struct ether_header *eh; 1544 struct ifnet *dst_if; 1545 struct bridge_softc *sc; 1546 1547 if (m->m_len < ETHER_HDR_LEN) { 1548 m = m_pullup(m, ETHER_HDR_LEN); 1549 if (m == NULL) 1550 return (0); 1551 } 1552 1553 eh = mtod(m, struct ether_header *); 1554 sc = ifp->if_bridge; 1555 1556 BRIDGE_LOCK(sc); 1557 1558 /* 1559 * If bridge is down, but the original output interface is up, 1560 * go ahead and send out that interface. Otherwise, the packet 1561 * is dropped below. 1562 */ 1563 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) { 1564 dst_if = ifp; 1565 goto sendunicast; 1566 } 1567 1568 /* 1569 * If the packet is a multicast, or we don't know a better way to 1570 * get there, send to all interfaces. 1571 */ 1572 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1573 dst_if = NULL; 1574 else 1575 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1576 if (dst_if == NULL) { 1577 struct bridge_iflist *bif; 1578 struct mbuf *mc; 1579 int error = 0, used = 0; 1580 1581 BRIDGE_LOCK2REF(sc, error); 1582 if (error) { 1583 m_freem(m); 1584 return (0); 1585 } 1586 1587 bridge_span(sc, m); 1588 1589 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1590 dst_if = bif->bif_ifp; 1591 if ((dst_if->if_flags & IFF_RUNNING) == 0) 1592 continue; 1593 1594 /* 1595 * If this is not the original output interface, 1596 * and the interface is participating in spanning 1597 * tree, make sure the port is in a state that 1598 * allows forwarding. 1599 */ 1600 if (dst_if != ifp && 1601 (bif->bif_flags & IFBIF_STP) != 0) { 1602 switch (bif->bif_state) { 1603 case BSTP_IFSTATE_BLOCKING: 1604 case BSTP_IFSTATE_LISTENING: 1605 case BSTP_IFSTATE_DISABLED: 1606 continue; 1607 } 1608 } 1609 1610 if (LIST_NEXT(bif, bif_next) == NULL) { 1611 used = 1; 1612 mc = m; 1613 } else { 1614 mc = m_copypacket(m, M_DONTWAIT); 1615 if (mc == NULL) { 1616 sc->sc_if.if_oerrors++; 1617 continue; 1618 } 1619 } 1620 1621 bridge_enqueue(sc, dst_if, mc); 1622 } 1623 if (used == 0) 1624 m_freem(m); 1625 BRIDGE_UNREF(sc); 1626 return (0); 1627 } 1628 1629 sendunicast: 1630 /* 1631 * XXX Spanning tree consideration here? 1632 */ 1633 1634 bridge_span(sc, m); 1635 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1636 m_freem(m); 1637 BRIDGE_UNLOCK(sc); 1638 return (0); 1639 } 1640 1641 BRIDGE_UNLOCK(sc); 1642 bridge_enqueue(sc, dst_if, m); 1643 return (0); 1644 } 1645 1646 /* 1647 * bridge_start: 1648 * 1649 * Start output on a bridge. 1650 * 1651 */ 1652 static void 1653 bridge_start(struct ifnet *ifp) 1654 { 1655 struct bridge_softc *sc; 1656 struct mbuf *m; 1657 struct ether_header *eh; 1658 struct ifnet *dst_if; 1659 1660 sc = ifp->if_softc; 1661 1662 ifp->if_flags |= IFF_OACTIVE; 1663 for (;;) { 1664 IFQ_DEQUEUE(&ifp->if_snd, m); 1665 if (m == 0) 1666 break; 1667 BPF_MTAP(ifp, m); 1668 1669 eh = mtod(m, struct ether_header *); 1670 dst_if = NULL; 1671 1672 BRIDGE_LOCK(sc); 1673 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1674 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1675 } 1676 1677 if (dst_if == NULL) 1678 bridge_broadcast(sc, ifp, m, 0); 1679 else { 1680 BRIDGE_UNLOCK(sc); 1681 bridge_enqueue(sc, dst_if, m); 1682 } 1683 } 1684 ifp->if_flags &= ~IFF_OACTIVE; 1685 1686 return; 1687 } 1688 1689 /* 1690 * bridge_forward: 1691 * 1692 * The forwarding function of the bridge. 1693 * 1694 * NOTE: Releases the lock on return. 1695 */ 1696 static void 1697 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1698 { 1699 struct bridge_iflist *bif; 1700 struct ifnet *src_if, *dst_if, *ifp; 1701 struct ether_header *eh; 1702 1703 src_if = m->m_pkthdr.rcvif; 1704 BRIDGE_LOCK_ASSERT(sc); 1705 ifp = &sc->sc_if; 1706 1707 sc->sc_if.if_ipackets++; 1708 sc->sc_if.if_ibytes += m->m_pkthdr.len; 1709 1710 /* 1711 * Look up the bridge_iflist. 1712 */ 1713 bif = bridge_lookup_member_if(sc, src_if); 1714 if (bif == NULL) { 1715 /* Interface is not a bridge member (anymore?) */ 1716 BRIDGE_UNLOCK(sc); 1717 m_freem(m); 1718 return; 1719 } 1720 1721 if (bif->bif_flags & IFBIF_STP) { 1722 switch (bif->bif_state) { 1723 case BSTP_IFSTATE_BLOCKING: 1724 case BSTP_IFSTATE_LISTENING: 1725 case BSTP_IFSTATE_DISABLED: 1726 BRIDGE_UNLOCK(sc); 1727 m_freem(m); 1728 return; 1729 } 1730 } 1731 1732 eh = mtod(m, struct ether_header *); 1733 1734 /* 1735 * If the interface is learning, and the source 1736 * address is valid and not multicast, record 1737 * the address. 1738 */ 1739 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1740 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1741 (eh->ether_shost[0] == 0 && 1742 eh->ether_shost[1] == 0 && 1743 eh->ether_shost[2] == 0 && 1744 eh->ether_shost[3] == 0 && 1745 eh->ether_shost[4] == 0 && 1746 eh->ether_shost[5] == 0) == 0) { 1747 (void) bridge_rtupdate(sc, eh->ether_shost, 1748 src_if, 0, IFBAF_DYNAMIC); 1749 } 1750 1751 if ((bif->bif_flags & IFBIF_STP) != 0 && 1752 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1753 m_freem(m); 1754 BRIDGE_UNLOCK(sc); 1755 return; 1756 } 1757 1758 /* 1759 * At this point, the port either doesn't participate 1760 * in spanning tree or it is in the forwarding state. 1761 */ 1762 1763 /* 1764 * If the packet is unicast, destined for someone on 1765 * "this" side of the bridge, drop it. 1766 */ 1767 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1768 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1769 if (src_if == dst_if) { 1770 BRIDGE_UNLOCK(sc); 1771 m_freem(m); 1772 return; 1773 } 1774 } else { 1775 /* ...forward it to all interfaces. */ 1776 sc->sc_if.if_imcasts++; 1777 dst_if = NULL; 1778 } 1779 1780 /* run the packet filter */ 1781 if (inet_pfil_hook.ph_busy_count >= 0 1782 #ifdef INET6 1783 || inet6_pfil_hook.ph_busy_count >= 0 1784 #endif 1785 ) { 1786 BRIDGE_UNLOCK(sc); 1787 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 1788 return; 1789 if (m == NULL) 1790 return; 1791 BRIDGE_LOCK(sc); 1792 } 1793 1794 if (dst_if == NULL) { 1795 /* 1796 * Tap off packets passing the bridge. Broadcast packets will 1797 * already be tapped as they are reinjected into ether_input. 1798 */ 1799 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) 1800 BPF_MTAP(ifp, m); 1801 1802 bridge_broadcast(sc, src_if, m, 1); 1803 return; 1804 } 1805 1806 /* 1807 * At this point, we're dealing with a unicast frame 1808 * going to a different interface. 1809 */ 1810 if ((dst_if->if_flags & IFF_RUNNING) == 0) { 1811 BRIDGE_UNLOCK(sc); 1812 m_freem(m); 1813 return; 1814 } 1815 bif = bridge_lookup_member_if(sc, dst_if); 1816 if (bif == NULL) { 1817 /* Not a member of the bridge (anymore?) */ 1818 BRIDGE_UNLOCK(sc); 1819 m_freem(m); 1820 return; 1821 } 1822 1823 if (bif->bif_flags & IFBIF_STP) { 1824 switch (bif->bif_state) { 1825 case BSTP_IFSTATE_DISABLED: 1826 case BSTP_IFSTATE_BLOCKING: 1827 BRIDGE_UNLOCK(sc); 1828 m_freem(m); 1829 return; 1830 } 1831 } 1832 1833 /* tap off packets passing the bridge */ 1834 BPF_MTAP(ifp, m); 1835 1836 BRIDGE_UNLOCK(sc); 1837 1838 if (inet_pfil_hook.ph_busy_count >= 0 1839 #ifdef INET6 1840 || inet6_pfil_hook.ph_busy_count >= 0 1841 #endif 1842 ) { 1843 if (bridge_pfil(&m, &sc->sc_if, dst_if, PFIL_OUT) != 0) 1844 return; 1845 if (m == NULL) 1846 return; 1847 } 1848 1849 bridge_enqueue(sc, dst_if, m); 1850 } 1851 1852 /* 1853 * bridge_input: 1854 * 1855 * Receive input from a member interface. Queue the packet for 1856 * bridging if it is not for us. 1857 */ 1858 static struct mbuf * 1859 bridge_input(struct ifnet *ifp, struct mbuf *m) 1860 { 1861 struct bridge_softc *sc = ifp->if_bridge; 1862 struct bridge_iflist *bif; 1863 struct ifnet *bifp; 1864 struct ether_header *eh; 1865 struct mbuf *mc, *mc2; 1866 1867 if ((sc->sc_if.if_flags & IFF_RUNNING) == 0) 1868 return (m); 1869 1870 bifp = &sc->sc_if; 1871 1872 BRIDGE_LOCK(sc); 1873 bif = bridge_lookup_member_if(sc, ifp); 1874 if (bif == NULL) { 1875 BRIDGE_UNLOCK(sc); 1876 return (m); 1877 } 1878 1879 eh = mtod(m, struct ether_header *); 1880 1881 if (memcmp(eh->ether_dhost, sc->ifb_ac.ac_enaddr, 1882 ETHER_ADDR_LEN) == 0) { 1883 /* 1884 * If the packet is for us, set the packets source as the 1885 * bridge, and return the packet back to ether_input for 1886 * local processing. 1887 */ 1888 1889 /* XXX Do we tap the packet for the member interface too? 1890 * BPF_MTAP(&m->m_pkthdr.rcvif, m); 1891 */ 1892 1893 /* Mark the packet as arriving on the bridge interface */ 1894 m->m_pkthdr.rcvif = bifp; 1895 BPF_MTAP(bifp, m); 1896 sc->sc_if.if_ipackets++; 1897 1898 BRIDGE_UNLOCK(sc); 1899 return (m); 1900 } 1901 1902 bridge_span(sc, m); 1903 1904 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1905 /* Tap off 802.1D packets; they do not get forwarded. */ 1906 if (memcmp(eh->ether_dhost, bstp_etheraddr, 1907 ETHER_ADDR_LEN) == 0) { 1908 m = bstp_input(ifp, m); 1909 if (m == NULL) { 1910 BRIDGE_UNLOCK(sc); 1911 return (NULL); 1912 } 1913 } 1914 1915 if (bif->bif_flags & IFBIF_STP) { 1916 switch (bif->bif_state) { 1917 case BSTP_IFSTATE_BLOCKING: 1918 case BSTP_IFSTATE_LISTENING: 1919 case BSTP_IFSTATE_DISABLED: 1920 BRIDGE_UNLOCK(sc); 1921 return (m); 1922 } 1923 } 1924 1925 if (bcmp(etherbroadcastaddr, eh->ether_dhost, 1926 sizeof(etherbroadcastaddr)) == 0) 1927 m->m_flags |= M_BCAST; 1928 else 1929 m->m_flags |= M_MCAST; 1930 1931 /* 1932 * Make a deep copy of the packet and enqueue the copy 1933 * for bridge processing; return the original packet for 1934 * local processing. 1935 */ 1936 mc = m_dup(m, M_DONTWAIT); 1937 if (mc == NULL) { 1938 BRIDGE_UNLOCK(sc); 1939 return (m); 1940 } 1941 1942 /* Perform the bridge forwarding function with the copy. */ 1943 bridge_forward(sc, mc); 1944 1945 /* 1946 * Reinject the mbuf as arriving on the bridge so we have a 1947 * chance at claiming multicast packets. We can not loop back 1948 * here from ether_input as a bridge is never a member of a 1949 * bridge. 1950 */ 1951 KASSERT(bifp->if_bridge == NULL, 1952 ("loop created in bridge_input")); 1953 mc2 = m_dup(m, M_DONTWAIT); 1954 if (mc2 != NULL) { 1955 /* Keep the layer3 header aligned */ 1956 int i = min(mc2->m_pkthdr.len, max_protohdr); 1957 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 1958 } 1959 if (mc2 != NULL) { 1960 mc2->m_pkthdr.rcvif = bifp; 1961 (*bifp->if_input)(bifp, mc2); 1962 } 1963 1964 /* Return the original packet for local processing. */ 1965 return (m); 1966 } 1967 1968 if (bif->bif_flags & IFBIF_STP) { 1969 switch (bif->bif_state) { 1970 case BSTP_IFSTATE_BLOCKING: 1971 case BSTP_IFSTATE_LISTENING: 1972 case BSTP_IFSTATE_DISABLED: 1973 BRIDGE_UNLOCK(sc); 1974 return (m); 1975 } 1976 } 1977 1978 /* 1979 * Unicast. Make sure it's not for us. 1980 */ 1981 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1982 /* It is destined for us. */ 1983 if (memcmp(IF_LLADDR(bif->bif_ifp), eh->ether_dhost, 1984 ETHER_ADDR_LEN) == 0) { 1985 if (bif->bif_flags & IFBIF_LEARNING) 1986 (void) bridge_rtupdate(sc, 1987 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1988 m->m_pkthdr.rcvif = bif->bif_ifp; 1989 BRIDGE_UNLOCK(sc); 1990 return (m); 1991 } 1992 1993 /* We just received a packet that we sent out. */ 1994 if (memcmp(IF_LLADDR(bif->bif_ifp), eh->ether_shost, 1995 ETHER_ADDR_LEN) == 0) { 1996 BRIDGE_UNLOCK(sc); 1997 m_freem(m); 1998 return (NULL); 1999 } 2000 } 2001 2002 /* Perform the bridge forwarding function. */ 2003 bridge_forward(sc, m); 2004 2005 return (NULL); 2006 } 2007 2008 /* 2009 * bridge_broadcast: 2010 * 2011 * Send a frame to all interfaces that are members of 2012 * the bridge, except for the one on which the packet 2013 * arrived. 2014 * 2015 * NOTE: Releases the lock on return. 2016 */ 2017 static void 2018 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2019 struct mbuf *m, int runfilt) 2020 { 2021 struct bridge_iflist *bif; 2022 struct mbuf *mc; 2023 struct ifnet *dst_if; 2024 int error = 0, used = 0, i; 2025 2026 BRIDGE_LOCK_ASSERT(sc); 2027 BRIDGE_LOCK2REF(sc, error); 2028 if (error) { 2029 m_freem(m); 2030 return; 2031 } 2032 2033 /* Filter on the bridge interface before broadcasting */ 2034 if (runfilt && (inet_pfil_hook.ph_busy_count >= 0 2035 #ifdef INET6 2036 || inet6_pfil_hook.ph_busy_count >= 0 2037 #endif 2038 )) { 2039 if (bridge_pfil(&m, &sc->sc_if, NULL, PFIL_OUT) != 0) 2040 goto out; 2041 if (m == NULL) 2042 goto out; 2043 } 2044 2045 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2046 dst_if = bif->bif_ifp; 2047 if (dst_if == src_if) 2048 continue; 2049 2050 if (bif->bif_flags & IFBIF_STP) { 2051 switch (bif->bif_state) { 2052 case BSTP_IFSTATE_BLOCKING: 2053 case BSTP_IFSTATE_DISABLED: 2054 continue; 2055 } 2056 } 2057 2058 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && 2059 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2060 continue; 2061 2062 if ((dst_if->if_flags & IFF_RUNNING) == 0) 2063 continue; 2064 2065 if (LIST_NEXT(bif, bif_next) == NULL) { 2066 mc = m; 2067 used = 1; 2068 } else { 2069 mc = m_dup(m, M_DONTWAIT); 2070 if (mc == NULL) { 2071 sc->sc_if.if_oerrors++; 2072 continue; 2073 } 2074 } 2075 2076 /* 2077 * Filter on the output interface. Pass a NULL bridge interface 2078 * pointer so we do not redundantly filter on the bridge for 2079 * each interface we broadcast on. 2080 */ 2081 if (runfilt && (inet_pfil_hook.ph_busy_count >= 0 2082 #ifdef INET6 2083 || inet6_pfil_hook.ph_busy_count >= 0 2084 #endif 2085 )) { 2086 if (used == 0) { 2087 /* Keep the layer3 header aligned */ 2088 i = min(mc->m_pkthdr.len, max_protohdr); 2089 mc = m_copyup(mc, i, ETHER_ALIGN); 2090 if (mc == NULL) { 2091 sc->sc_if.if_oerrors++; 2092 continue; 2093 } 2094 } 2095 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2096 continue; 2097 if (mc == NULL) 2098 continue; 2099 } 2100 2101 bridge_enqueue(sc, dst_if, mc); 2102 } 2103 if (used == 0) 2104 m_freem(m); 2105 2106 out: 2107 BRIDGE_UNREF(sc); 2108 } 2109 2110 /* 2111 * bridge_span: 2112 * 2113 * Duplicate a packet out one or more interfaces that are in span mode, 2114 * the original mbuf is unmodified. 2115 */ 2116 static void 2117 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2118 { 2119 struct bridge_iflist *bif; 2120 struct ifnet *dst_if; 2121 struct mbuf *mc; 2122 2123 if (LIST_EMPTY(&sc->sc_spanlist)) 2124 return; 2125 2126 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2127 dst_if = bif->bif_ifp; 2128 2129 if ((dst_if->if_flags & IFF_RUNNING) == 0) 2130 continue; 2131 2132 mc = m_copypacket(m, M_DONTWAIT); 2133 if (mc == NULL) { 2134 sc->sc_if.if_oerrors++; 2135 continue; 2136 } 2137 2138 bridge_enqueue(sc, dst_if, mc); 2139 } 2140 } 2141 2142 /* 2143 * bridge_rtupdate: 2144 * 2145 * Add a bridge routing entry. 2146 */ 2147 static int 2148 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 2149 struct ifnet *dst_if, int setflags, uint8_t flags) 2150 { 2151 struct bridge_rtnode *brt; 2152 int error; 2153 2154 BRIDGE_LOCK_ASSERT(sc); 2155 2156 /* 2157 * A route for this destination might already exist. If so, 2158 * update it, otherwise create a new one. 2159 */ 2160 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) { 2161 if (sc->sc_brtcnt >= sc->sc_brtmax) 2162 return (ENOSPC); 2163 2164 /* 2165 * Allocate a new bridge forwarding node, and 2166 * initialize the expiration time and Ethernet 2167 * address. 2168 */ 2169 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2170 if (brt == NULL) 2171 return (ENOMEM); 2172 2173 brt->brt_flags = IFBAF_DYNAMIC; 2174 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2175 2176 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2177 uma_zfree(bridge_rtnode_zone, brt); 2178 return (error); 2179 } 2180 } 2181 2182 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2183 brt->brt_ifp = dst_if; 2184 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2185 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2186 if (setflags) 2187 brt->brt_flags = flags; 2188 2189 return (0); 2190 } 2191 2192 /* 2193 * bridge_rtlookup: 2194 * 2195 * Lookup the destination interface for an address. 2196 */ 2197 static struct ifnet * 2198 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2199 { 2200 struct bridge_rtnode *brt; 2201 2202 BRIDGE_LOCK_ASSERT(sc); 2203 2204 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 2205 return (NULL); 2206 2207 return (brt->brt_ifp); 2208 } 2209 2210 /* 2211 * bridge_rttrim: 2212 * 2213 * Trim the routine table so that we have a number 2214 * of routing entries less than or equal to the 2215 * maximum number. 2216 */ 2217 static void 2218 bridge_rttrim(struct bridge_softc *sc) 2219 { 2220 struct bridge_rtnode *brt, *nbrt; 2221 2222 BRIDGE_LOCK_ASSERT(sc); 2223 2224 /* Make sure we actually need to do this. */ 2225 if (sc->sc_brtcnt <= sc->sc_brtmax) 2226 return; 2227 2228 /* Force an aging cycle; this might trim enough addresses. */ 2229 bridge_rtage(sc); 2230 if (sc->sc_brtcnt <= sc->sc_brtmax) 2231 return; 2232 2233 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2234 nbrt = LIST_NEXT(brt, brt_list); 2235 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2236 bridge_rtnode_destroy(sc, brt); 2237 if (sc->sc_brtcnt <= sc->sc_brtmax) 2238 return; 2239 } 2240 } 2241 } 2242 2243 /* 2244 * bridge_timer: 2245 * 2246 * Aging timer for the bridge. 2247 */ 2248 static void 2249 bridge_timer(void *arg) 2250 { 2251 struct bridge_softc *sc = arg; 2252 2253 BRIDGE_LOCK(sc); 2254 bridge_rtage(sc); 2255 BRIDGE_UNLOCK(sc); 2256 2257 if (sc->sc_if.if_flags & IFF_RUNNING) 2258 callout_reset(&sc->sc_brcallout, 2259 bridge_rtable_prune_period * hz, bridge_timer, sc); 2260 } 2261 2262 /* 2263 * bridge_rtage: 2264 * 2265 * Perform an aging cycle. 2266 */ 2267 static void 2268 bridge_rtage(struct bridge_softc *sc) 2269 { 2270 struct bridge_rtnode *brt, *nbrt; 2271 2272 BRIDGE_LOCK_ASSERT(sc); 2273 2274 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2275 nbrt = LIST_NEXT(brt, brt_list); 2276 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2277 if (time_uptime >= brt->brt_expire) 2278 bridge_rtnode_destroy(sc, brt); 2279 } 2280 } 2281 } 2282 2283 /* 2284 * bridge_rtflush: 2285 * 2286 * Remove all dynamic addresses from the bridge. 2287 */ 2288 static void 2289 bridge_rtflush(struct bridge_softc *sc, int full) 2290 { 2291 struct bridge_rtnode *brt, *nbrt; 2292 2293 BRIDGE_LOCK_ASSERT(sc); 2294 2295 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2296 nbrt = LIST_NEXT(brt, brt_list); 2297 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2298 bridge_rtnode_destroy(sc, brt); 2299 } 2300 } 2301 2302 /* 2303 * bridge_rtdaddr: 2304 * 2305 * Remove an address from the table. 2306 */ 2307 static int 2308 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2309 { 2310 struct bridge_rtnode *brt; 2311 2312 BRIDGE_LOCK_ASSERT(sc); 2313 2314 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 2315 return (ENOENT); 2316 2317 bridge_rtnode_destroy(sc, brt); 2318 return (0); 2319 } 2320 2321 /* 2322 * bridge_rtdelete: 2323 * 2324 * Delete routes to a speicifc member interface. 2325 */ 2326 void 2327 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2328 { 2329 struct bridge_rtnode *brt, *nbrt; 2330 2331 BRIDGE_LOCK_ASSERT(sc); 2332 2333 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2334 nbrt = LIST_NEXT(brt, brt_list); 2335 if (brt->brt_ifp == ifp && (full || 2336 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2337 bridge_rtnode_destroy(sc, brt); 2338 } 2339 } 2340 2341 /* 2342 * bridge_rtable_init: 2343 * 2344 * Initialize the route table for this bridge. 2345 */ 2346 static int 2347 bridge_rtable_init(struct bridge_softc *sc) 2348 { 2349 int i; 2350 2351 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2352 M_DEVBUF, M_NOWAIT); 2353 if (sc->sc_rthash == NULL) 2354 return (ENOMEM); 2355 2356 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2357 LIST_INIT(&sc->sc_rthash[i]); 2358 2359 sc->sc_rthash_key = arc4random(); 2360 2361 LIST_INIT(&sc->sc_rtlist); 2362 2363 return (0); 2364 } 2365 2366 /* 2367 * bridge_rtable_fini: 2368 * 2369 * Deconstruct the route table for this bridge. 2370 */ 2371 static void 2372 bridge_rtable_fini(struct bridge_softc *sc) 2373 { 2374 2375 free(sc->sc_rthash, M_DEVBUF); 2376 } 2377 2378 /* 2379 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2380 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2381 */ 2382 #define mix(a, b, c) \ 2383 do { \ 2384 a -= b; a -= c; a ^= (c >> 13); \ 2385 b -= c; b -= a; b ^= (a << 8); \ 2386 c -= a; c -= b; c ^= (b >> 13); \ 2387 a -= b; a -= c; a ^= (c >> 12); \ 2388 b -= c; b -= a; b ^= (a << 16); \ 2389 c -= a; c -= b; c ^= (b >> 5); \ 2390 a -= b; a -= c; a ^= (c >> 3); \ 2391 b -= c; b -= a; b ^= (a << 10); \ 2392 c -= a; c -= b; c ^= (b >> 15); \ 2393 } while (/*CONSTCOND*/0) 2394 2395 static __inline uint32_t 2396 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2397 { 2398 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2399 2400 b += addr[5] << 8; 2401 b += addr[4]; 2402 a += addr[3] << 24; 2403 a += addr[2] << 16; 2404 a += addr[1] << 8; 2405 a += addr[0]; 2406 2407 mix(a, b, c); 2408 2409 return (c & BRIDGE_RTHASH_MASK); 2410 } 2411 2412 #undef mix 2413 2414 static int 2415 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2416 { 2417 int i, d; 2418 2419 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2420 d = ((int)a[i]) - ((int)b[i]); 2421 } 2422 2423 return (d); 2424 } 2425 2426 /* 2427 * bridge_rtnode_lookup: 2428 * 2429 * Look up a bridge route node for the specified destination. 2430 */ 2431 static struct bridge_rtnode * 2432 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2433 { 2434 struct bridge_rtnode *brt; 2435 uint32_t hash; 2436 int dir; 2437 2438 BRIDGE_LOCK_ASSERT(sc); 2439 2440 hash = bridge_rthash(sc, addr); 2441 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2442 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2443 if (dir == 0) 2444 return (brt); 2445 if (dir > 0) 2446 return (NULL); 2447 } 2448 2449 return (NULL); 2450 } 2451 2452 /* 2453 * bridge_rtnode_insert: 2454 * 2455 * Insert the specified bridge node into the route table. We 2456 * assume the entry is not already in the table. 2457 */ 2458 static int 2459 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2460 { 2461 struct bridge_rtnode *lbrt; 2462 uint32_t hash; 2463 int dir; 2464 2465 BRIDGE_LOCK_ASSERT(sc); 2466 2467 hash = bridge_rthash(sc, brt->brt_addr); 2468 2469 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2470 if (lbrt == NULL) { 2471 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2472 goto out; 2473 } 2474 2475 do { 2476 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2477 if (dir == 0) 2478 return (EEXIST); 2479 if (dir > 0) { 2480 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2481 goto out; 2482 } 2483 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2484 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2485 goto out; 2486 } 2487 lbrt = LIST_NEXT(lbrt, brt_hash); 2488 } while (lbrt != NULL); 2489 2490 #ifdef DIAGNOSTIC 2491 panic("bridge_rtnode_insert: impossible"); 2492 #endif 2493 2494 out: 2495 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2496 sc->sc_brtcnt++; 2497 2498 return (0); 2499 } 2500 2501 /* 2502 * bridge_rtnode_destroy: 2503 * 2504 * Destroy a bridge rtnode. 2505 */ 2506 static void 2507 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2508 { 2509 BRIDGE_LOCK_ASSERT(sc); 2510 2511 LIST_REMOVE(brt, brt_hash); 2512 2513 LIST_REMOVE(brt, brt_list); 2514 sc->sc_brtcnt--; 2515 uma_zfree(bridge_rtnode_zone, brt); 2516 } 2517 2518 /* 2519 * Send bridge packets through pfil if they are one of the types pfil can deal 2520 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 2521 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 2522 * that interface. 2523 */ 2524 static int 2525 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 2526 { 2527 int snap, error, i; 2528 struct ether_header *eh1, eh2; 2529 struct ip_fw_args args; 2530 struct ip *ip; 2531 struct llc llc1; 2532 u_int16_t ether_type; 2533 2534 snap = 0; 2535 error = -1; /* Default error if not error == 0 */ 2536 2537 /* we may return with the IP fields swapped, ensure its not shared */ 2538 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 2539 2540 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) 2541 return 0; /* filtering is disabled */ 2542 2543 i = min((*mp)->m_pkthdr.len, max_protohdr); 2544 if ((*mp)->m_len < i) { 2545 *mp = m_pullup(*mp, i); 2546 if (*mp == NULL) { 2547 printf("%s: m_pullup failed\n", __func__); 2548 return -1; 2549 } 2550 } 2551 2552 eh1 = mtod(*mp, struct ether_header *); 2553 ether_type = ntohs(eh1->ether_type); 2554 2555 /* 2556 * Check for SNAP/LLC. 2557 */ 2558 if (ether_type < ETHERMTU) { 2559 struct llc *llc2 = (struct llc *)(eh1 + 1); 2560 2561 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2562 llc2->llc_dsap == LLC_SNAP_LSAP && 2563 llc2->llc_ssap == LLC_SNAP_LSAP && 2564 llc2->llc_control == LLC_UI) { 2565 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2566 snap = 1; 2567 } 2568 } 2569 2570 /* 2571 * If we're trying to filter bridge traffic, don't look at anything 2572 * other than IP and ARP traffic. If the filter doesn't understand 2573 * IPv6, don't allow IPv6 through the bridge either. This is lame 2574 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2575 * but of course we don't have an AppleTalk filter to begin with. 2576 * (Note that since pfil doesn't understand ARP it will pass *ALL* 2577 * ARP traffic.) 2578 */ 2579 switch (ether_type) { 2580 case ETHERTYPE_ARP: 2581 case ETHERTYPE_REVARP: 2582 return 0; /* Automatically pass */ 2583 case ETHERTYPE_IP: 2584 # ifdef INET6 2585 case ETHERTYPE_IPV6: 2586 # endif /* INET6 */ 2587 break; 2588 default: 2589 /* 2590 * Check to see if the user wants to pass non-ip 2591 * packets, these will not be checked by pfil(9) and 2592 * passed unconditionally so the default is to drop. 2593 */ 2594 if (pfil_onlyip) 2595 goto bad; 2596 } 2597 2598 /* Strip off the Ethernet header and keep a copy. */ 2599 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 2600 m_adj(*mp, ETHER_HDR_LEN); 2601 2602 /* Strip off snap header, if present */ 2603 if (snap) { 2604 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 2605 m_adj(*mp, sizeof(struct llc)); 2606 } 2607 2608 /* 2609 * Check the IP header for alignment and errors 2610 */ 2611 if (dir == PFIL_IN) { 2612 switch (ether_type) { 2613 case ETHERTYPE_IP: 2614 error = bridge_ip_checkbasic(mp); 2615 break; 2616 # ifdef INET6 2617 case ETHERTYPE_IPV6: 2618 error = bridge_ip6_checkbasic(mp); 2619 break; 2620 # endif /* INET6 */ 2621 default: 2622 error = 0; 2623 } 2624 if (error) 2625 goto bad; 2626 } 2627 2628 if (IPFW_LOADED && pfil_ipfw != 0 && dir == PFIL_OUT && ifp != NULL) { 2629 error = -1; 2630 args.rule = ip_dn_claim_rule(*mp); 2631 if (args.rule != NULL && fw_one_pass) 2632 goto ipfwpass; /* packet already partially processed */ 2633 2634 args.m = *mp; 2635 args.oif = ifp; 2636 args.next_hop = NULL; 2637 args.eh = &eh2; 2638 args.inp = NULL; /* used by ipfw uid/gid/jail rules */ 2639 i = ip_fw_chk_ptr(&args); 2640 *mp = args.m; 2641 2642 if (*mp == NULL) 2643 return error; 2644 2645 if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG)) { 2646 2647 /* put the Ethernet header back on */ 2648 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2649 if (*mp == NULL) 2650 return error; 2651 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 2652 2653 /* 2654 * Pass the pkt to dummynet, which consumes it. The 2655 * packet will return to us via bridge_dummynet(). 2656 */ 2657 args.oif = ifp; 2658 ip_dn_io_ptr(*mp, (i & 0xffff), DN_TO_IFB_FWD, &args); 2659 return error; 2660 } 2661 2662 if (i & IP_FW_PORT_DENY_FLAG) /* drop */ 2663 goto bad; 2664 } 2665 2666 ipfwpass: 2667 error = 0; 2668 2669 /* 2670 * Run the packet through pfil 2671 */ 2672 switch (ether_type) 2673 { 2674 case ETHERTYPE_IP : 2675 /* 2676 * before calling the firewall, swap fields the same as 2677 * IP does. here we assume the header is contiguous 2678 */ 2679 ip = mtod(*mp, struct ip *); 2680 2681 ip->ip_len = ntohs(ip->ip_len); 2682 ip->ip_off = ntohs(ip->ip_off); 2683 2684 /* 2685 * Run pfil on the member interface and the bridge, both can 2686 * be skipped by clearing pfil_member or pfil_bridge. 2687 * 2688 * Keep the order: 2689 * in_if -> bridge_if -> out_if 2690 */ 2691 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 2692 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, 2693 dir, NULL); 2694 2695 if (*mp == NULL || error != 0) /* filter may consume */ 2696 break; 2697 2698 if (pfil_member && ifp != NULL) 2699 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, 2700 dir, NULL); 2701 2702 if (*mp == NULL || error != 0) /* filter may consume */ 2703 break; 2704 2705 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 2706 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, 2707 dir, NULL); 2708 2709 /* Restore ip and the fields ntohs()'d. */ 2710 if (*mp != NULL && error == 0) { 2711 ip = mtod(*mp, struct ip *); 2712 ip->ip_len = htons(ip->ip_len); 2713 ip->ip_off = htons(ip->ip_off); 2714 } 2715 2716 break; 2717 # ifdef INET6 2718 case ETHERTYPE_IPV6 : 2719 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 2720 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, 2721 dir, NULL); 2722 2723 if (*mp == NULL || error != 0) /* filter may consume */ 2724 break; 2725 2726 if (pfil_member && ifp != NULL) 2727 error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp, 2728 dir, NULL); 2729 2730 if (*mp == NULL || error != 0) /* filter may consume */ 2731 break; 2732 2733 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 2734 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, 2735 dir, NULL); 2736 break; 2737 # endif 2738 default : 2739 error = 0; 2740 break; 2741 } 2742 2743 if (*mp == NULL) 2744 return error; 2745 if (error != 0) 2746 goto bad; 2747 2748 error = -1; 2749 2750 /* 2751 * Finally, put everything back the way it was and return 2752 */ 2753 if (snap) { 2754 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2755 if (*mp == NULL) 2756 return error; 2757 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 2758 } 2759 2760 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2761 if (*mp == NULL) 2762 return error; 2763 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 2764 2765 return 0; 2766 2767 bad: 2768 m_freem(*mp); 2769 *mp = NULL; 2770 return error; 2771 } 2772 2773 /* 2774 * Perform basic checks on header size since 2775 * pfil assumes ip_input has already processed 2776 * it for it. Cut-and-pasted from ip_input.c. 2777 * Given how simple the IPv6 version is, 2778 * does the IPv4 version really need to be 2779 * this complicated? 2780 * 2781 * XXX Should we update ipstat here, or not? 2782 * XXX Right now we update ipstat but not 2783 * XXX csum_counter. 2784 */ 2785 static int 2786 bridge_ip_checkbasic(struct mbuf **mp) 2787 { 2788 struct mbuf *m = *mp; 2789 struct ip *ip; 2790 int len, hlen; 2791 u_short sum; 2792 2793 if (*mp == NULL) 2794 return -1; 2795 2796 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 2797 if ((m = m_copyup(m, sizeof(struct ip), 2798 (max_linkhdr + 3) & ~3)) == NULL) { 2799 /* XXXJRT new stat, please */ 2800 ipstat.ips_toosmall++; 2801 goto bad; 2802 } 2803 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2804 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2805 ipstat.ips_toosmall++; 2806 goto bad; 2807 } 2808 } 2809 ip = mtod(m, struct ip *); 2810 if (ip == NULL) goto bad; 2811 2812 if (ip->ip_v != IPVERSION) { 2813 ipstat.ips_badvers++; 2814 goto bad; 2815 } 2816 hlen = ip->ip_hl << 2; 2817 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2818 ipstat.ips_badhlen++; 2819 goto bad; 2820 } 2821 if (hlen > m->m_len) { 2822 if ((m = m_pullup(m, hlen)) == 0) { 2823 ipstat.ips_badhlen++; 2824 goto bad; 2825 } 2826 ip = mtod(m, struct ip *); 2827 if (ip == NULL) goto bad; 2828 } 2829 2830 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 2831 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 2832 } else { 2833 if (hlen == sizeof(struct ip)) { 2834 sum = in_cksum_hdr(ip); 2835 } else { 2836 sum = in_cksum(m, hlen); 2837 } 2838 } 2839 if (sum) { 2840 ipstat.ips_badsum++; 2841 goto bad; 2842 } 2843 2844 /* Retrieve the packet length. */ 2845 len = ntohs(ip->ip_len); 2846 2847 /* 2848 * Check for additional length bogosity 2849 */ 2850 if (len < hlen) { 2851 ipstat.ips_badlen++; 2852 goto bad; 2853 } 2854 2855 /* 2856 * Check that the amount of data in the buffers 2857 * is as at least much as the IP header would have us expect. 2858 * Drop packet if shorter than we expect. 2859 */ 2860 if (m->m_pkthdr.len < len) { 2861 ipstat.ips_tooshort++; 2862 goto bad; 2863 } 2864 2865 /* Checks out, proceed */ 2866 *mp = m; 2867 return 0; 2868 2869 bad: 2870 *mp = m; 2871 return -1; 2872 } 2873 2874 # ifdef INET6 2875 /* 2876 * Same as above, but for IPv6. 2877 * Cut-and-pasted from ip6_input.c. 2878 * XXX Should we update ip6stat, or not? 2879 */ 2880 static int 2881 bridge_ip6_checkbasic(struct mbuf **mp) 2882 { 2883 struct mbuf *m = *mp; 2884 struct ip6_hdr *ip6; 2885 2886 /* 2887 * If the IPv6 header is not aligned, slurp it up into a new 2888 * mbuf with space for link headers, in the event we forward 2889 * it. Otherwise, if it is aligned, make sure the entire base 2890 * IPv6 header is in the first mbuf of the chain. 2891 */ 2892 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 2893 struct ifnet *inifp = m->m_pkthdr.rcvif; 2894 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2895 (max_linkhdr + 3) & ~3)) == NULL) { 2896 /* XXXJRT new stat, please */ 2897 ip6stat.ip6s_toosmall++; 2898 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2899 goto bad; 2900 } 2901 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2902 struct ifnet *inifp = m->m_pkthdr.rcvif; 2903 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2904 ip6stat.ip6s_toosmall++; 2905 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2906 goto bad; 2907 } 2908 } 2909 2910 ip6 = mtod(m, struct ip6_hdr *); 2911 2912 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2913 ip6stat.ip6s_badvers++; 2914 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 2915 goto bad; 2916 } 2917 2918 /* Checks out, proceed */ 2919 *mp = m; 2920 return 0; 2921 2922 bad: 2923 *mp = m; 2924 return -1; 2925 } 2926 # endif /* INET6 */
Cache object: 2c0965a22ab803eba08996ec077c5564
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