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("$FreeBSD$"); 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 /* 133 * Size of the route hash table. Must be a power of two. 134 */ 135 #ifndef BRIDGE_RTHASH_SIZE 136 #define BRIDGE_RTHASH_SIZE 1024 137 #endif 138 139 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 140 141 /* 142 * Maximum number of addresses to cache. 143 */ 144 #ifndef BRIDGE_RTABLE_MAX 145 #define BRIDGE_RTABLE_MAX 100 146 #endif 147 148 /* 149 * Spanning tree defaults. 150 */ 151 #define BSTP_DEFAULT_MAX_AGE (20 * 256) 152 #define BSTP_DEFAULT_HELLO_TIME (2 * 256) 153 #define BSTP_DEFAULT_FORWARD_DELAY (15 * 256) 154 #define BSTP_DEFAULT_HOLD_TIME (1 * 256) 155 #define BSTP_DEFAULT_BRIDGE_PRIORITY 0x8000 156 #define BSTP_DEFAULT_PORT_PRIORITY 0x80 157 #define BSTP_DEFAULT_PATH_COST 55 158 159 /* 160 * Timeout (in seconds) for entries learned dynamically. 161 */ 162 #ifndef BRIDGE_RTABLE_TIMEOUT 163 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 164 #endif 165 166 /* 167 * Number of seconds between walks of the route list. 168 */ 169 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 170 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 171 #endif 172 173 static struct mtx bridge_list_mtx; 174 eventhandler_tag bridge_detach_cookie = NULL; 175 176 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 177 178 uma_zone_t bridge_rtnode_zone; 179 180 static int bridge_clone_create(struct if_clone *, int); 181 static void bridge_clone_destroy(struct ifnet *); 182 183 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 184 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 185 static void bridge_init(void *); 186 static void bridge_dummynet(struct mbuf *, struct ifnet *); 187 static void bridge_stop(struct ifnet *, int); 188 static void bridge_start(struct ifnet *); 189 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 190 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 191 struct rtentry *); 192 193 static void bridge_forward(struct bridge_softc *, struct mbuf *m); 194 195 static void bridge_timer(void *); 196 197 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 198 struct mbuf *, int); 199 static void bridge_span(struct bridge_softc *, struct mbuf *); 200 201 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 202 struct ifnet *, int, uint8_t); 203 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 204 static void bridge_rttrim(struct bridge_softc *); 205 static void bridge_rtage(struct bridge_softc *); 206 static void bridge_rtflush(struct bridge_softc *, int); 207 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 208 209 static int bridge_rtable_init(struct bridge_softc *); 210 static void bridge_rtable_fini(struct bridge_softc *); 211 212 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 213 const uint8_t *); 214 static int bridge_rtnode_insert(struct bridge_softc *, 215 struct bridge_rtnode *); 216 static void bridge_rtnode_destroy(struct bridge_softc *, 217 struct bridge_rtnode *); 218 219 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 220 const char *name); 221 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 222 struct ifnet *ifp); 223 static void bridge_delete_member(struct bridge_softc *, 224 struct bridge_iflist *, int); 225 static void bridge_delete_span(struct bridge_softc *, 226 struct bridge_iflist *); 227 228 static int bridge_ioctl_add(struct bridge_softc *, void *); 229 static int bridge_ioctl_del(struct bridge_softc *, void *); 230 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 231 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 232 static int bridge_ioctl_scache(struct bridge_softc *, void *); 233 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 234 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 235 static int bridge_ioctl_rts(struct bridge_softc *, void *); 236 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 237 static int bridge_ioctl_sto(struct bridge_softc *, void *); 238 static int bridge_ioctl_gto(struct bridge_softc *, void *); 239 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 240 static int bridge_ioctl_flush(struct bridge_softc *, void *); 241 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 242 static int bridge_ioctl_spri(struct bridge_softc *, void *); 243 static int bridge_ioctl_ght(struct bridge_softc *, void *); 244 static int bridge_ioctl_sht(struct bridge_softc *, void *); 245 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 246 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 247 static int bridge_ioctl_gma(struct bridge_softc *, void *); 248 static int bridge_ioctl_sma(struct bridge_softc *, void *); 249 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 250 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 251 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 252 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 253 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 254 int); 255 static int bridge_ip_checkbasic(struct mbuf **mp); 256 # ifdef INET6 257 static int bridge_ip6_checkbasic(struct mbuf **mp); 258 # endif /* INET6 */ 259 260 SYSCTL_DECL(_net_link); 261 SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 262 263 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */ 264 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */ 265 static int pfil_member = 1; /* run pfil hooks on the member interface */ 266 static int pfil_ipfw = 0; /* layer2 filter with ipfw */ 267 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW, 268 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled"); 269 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW, 270 &pfil_bridge, 0, "Packet filter on the bridge interface"); 271 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW, 272 &pfil_member, 0, "Packet filter on the member interface"); 273 274 struct bridge_control { 275 int (*bc_func)(struct bridge_softc *, void *); 276 int bc_argsize; 277 int bc_flags; 278 }; 279 280 #define BC_F_COPYIN 0x01 /* copy arguments in */ 281 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 282 #define BC_F_SUSER 0x04 /* do super-user check */ 283 284 const struct bridge_control bridge_control_table[] = { 285 { bridge_ioctl_add, sizeof(struct ifbreq), 286 BC_F_COPYIN|BC_F_SUSER }, 287 { bridge_ioctl_del, sizeof(struct ifbreq), 288 BC_F_COPYIN|BC_F_SUSER }, 289 290 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 291 BC_F_COPYIN|BC_F_COPYOUT }, 292 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 293 BC_F_COPYIN|BC_F_SUSER }, 294 295 { bridge_ioctl_scache, sizeof(struct ifbrparam), 296 BC_F_COPYIN|BC_F_SUSER }, 297 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 298 BC_F_COPYOUT }, 299 300 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 301 BC_F_COPYIN|BC_F_COPYOUT }, 302 { bridge_ioctl_rts, sizeof(struct ifbaconf), 303 BC_F_COPYIN|BC_F_COPYOUT }, 304 305 { bridge_ioctl_saddr, sizeof(struct ifbareq), 306 BC_F_COPYIN|BC_F_SUSER }, 307 308 { bridge_ioctl_sto, sizeof(struct ifbrparam), 309 BC_F_COPYIN|BC_F_SUSER }, 310 { bridge_ioctl_gto, sizeof(struct ifbrparam), 311 BC_F_COPYOUT }, 312 313 { bridge_ioctl_daddr, sizeof(struct ifbareq), 314 BC_F_COPYIN|BC_F_SUSER }, 315 316 { bridge_ioctl_flush, sizeof(struct ifbreq), 317 BC_F_COPYIN|BC_F_SUSER }, 318 319 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 320 BC_F_COPYOUT }, 321 { bridge_ioctl_spri, sizeof(struct ifbrparam), 322 BC_F_COPYIN|BC_F_SUSER }, 323 324 { bridge_ioctl_ght, sizeof(struct ifbrparam), 325 BC_F_COPYOUT }, 326 { bridge_ioctl_sht, sizeof(struct ifbrparam), 327 BC_F_COPYIN|BC_F_SUSER }, 328 329 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 330 BC_F_COPYOUT }, 331 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 332 BC_F_COPYIN|BC_F_SUSER }, 333 334 { bridge_ioctl_gma, sizeof(struct ifbrparam), 335 BC_F_COPYOUT }, 336 { bridge_ioctl_sma, sizeof(struct ifbrparam), 337 BC_F_COPYIN|BC_F_SUSER }, 338 339 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 340 BC_F_COPYIN|BC_F_SUSER }, 341 342 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 343 BC_F_COPYIN|BC_F_SUSER }, 344 345 { bridge_ioctl_addspan, sizeof(struct ifbreq), 346 BC_F_COPYIN|BC_F_SUSER }, 347 { bridge_ioctl_delspan, sizeof(struct ifbreq), 348 BC_F_COPYIN|BC_F_SUSER }, 349 }; 350 const int bridge_control_table_size = 351 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 352 353 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] = 354 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 355 356 LIST_HEAD(, bridge_softc) bridge_list; 357 358 IFC_SIMPLE_DECLARE(bridge, 0); 359 360 static int 361 bridge_modevent(module_t mod, int type, void *data) 362 { 363 364 switch (type) { 365 case MOD_LOAD: 366 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF); 367 if_clone_attach(&bridge_cloner); 368 bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 369 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 370 UMA_ALIGN_PTR, 0); 371 LIST_INIT(&bridge_list); 372 bridge_input_p = bridge_input; 373 bridge_output_p = bridge_output; 374 bridge_dn_p = bridge_dummynet; 375 bstp_linkstate_p = bstp_linkstate; 376 bridge_detach_cookie = EVENTHANDLER_REGISTER( 377 ifnet_departure_event, bridge_ifdetach, NULL, 378 EVENTHANDLER_PRI_ANY); 379 break; 380 case MOD_UNLOAD: 381 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 382 bridge_detach_cookie); 383 if_clone_detach(&bridge_cloner); 384 uma_zdestroy(bridge_rtnode_zone); 385 bridge_input_p = NULL; 386 bridge_output_p = NULL; 387 bridge_dn_p = NULL; 388 bstp_linkstate_p = NULL; 389 mtx_destroy(&bridge_list_mtx); 390 break; 391 default: 392 return EOPNOTSUPP; 393 } 394 return 0; 395 } 396 397 static moduledata_t bridge_mod = { 398 "if_bridge", 399 bridge_modevent, 400 0 401 }; 402 403 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 404 405 /* 406 * handler for net.link.bridge.pfil_ipfw 407 */ 408 static int 409 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 410 { 411 int enable = pfil_ipfw; 412 int error; 413 414 error = sysctl_handle_int(oidp, &enable, 0, req); 415 enable = (enable) ? 1 : 0; 416 417 if (enable != pfil_ipfw) { 418 pfil_ipfw = enable; 419 420 /* 421 * Disable pfil so that ipfw doesnt run twice, if the user 422 * really wants both then they can re-enable pfil_bridge and/or 423 * pfil_member. Also allow non-ip packets as ipfw can filter by 424 * layer2 type. 425 */ 426 if (pfil_ipfw) { 427 pfil_onlyip = 0; 428 pfil_bridge = 0; 429 pfil_member = 0; 430 } 431 } 432 433 return error; 434 } 435 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW, 436 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW"); 437 438 /* 439 * bridge_clone_create: 440 * 441 * Create a new bridge instance. 442 */ 443 static int 444 bridge_clone_create(struct if_clone *ifc, int unit) 445 { 446 struct bridge_softc *sc; 447 struct ifnet *ifp; 448 u_char eaddr[6]; 449 450 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 451 BRIDGE_LOCK_INIT(sc); 452 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 453 if (ifp == NULL) { 454 free(sc, M_DEVBUF); 455 return (ENOSPC); 456 } 457 458 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 459 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 460 sc->sc_bridge_max_age = BSTP_DEFAULT_MAX_AGE; 461 sc->sc_bridge_hello_time = BSTP_DEFAULT_HELLO_TIME; 462 sc->sc_bridge_forward_delay = BSTP_DEFAULT_FORWARD_DELAY; 463 sc->sc_bridge_priority = BSTP_DEFAULT_BRIDGE_PRIORITY; 464 sc->sc_hold_time = BSTP_DEFAULT_HOLD_TIME; 465 466 /* Initialize our routing table. */ 467 bridge_rtable_init(sc); 468 469 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 470 callout_init_mtx(&sc->sc_bstpcallout, &sc->sc_mtx, 0); 471 472 LIST_INIT(&sc->sc_iflist); 473 LIST_INIT(&sc->sc_spanlist); 474 475 ifp->if_softc = sc; 476 if_initname(ifp, ifc->ifc_name, unit); 477 ifp->if_mtu = ETHERMTU; 478 ifp->if_flags = IFF_BROADCAST | IFF_MULTICAST; 479 ifp->if_ioctl = bridge_ioctl; 480 ifp->if_output = bridge_output; 481 ifp->if_start = bridge_start; 482 ifp->if_init = bridge_init; 483 ifp->if_type = IFT_BRIDGE; 484 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 485 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 486 IFQ_SET_READY(&ifp->if_snd); 487 ifp->if_hdrlen = ETHER_HDR_LEN; 488 489 /* 490 * Generate a random ethernet address and use the private AC:DE:48 491 * OUI code. 492 */ 493 arc4rand(eaddr, ETHER_ADDR_LEN, 1); 494 eaddr[0] = 0xAC; 495 eaddr[1] = 0xDE; 496 eaddr[2] = 0x48; 497 498 ether_ifattach(ifp, eaddr); 499 /* Now undo some of the damage... */ 500 ifp->if_baudrate = 0; 501 ifp->if_type = IFT_BRIDGE; 502 503 mtx_lock(&bridge_list_mtx); 504 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 505 mtx_unlock(&bridge_list_mtx); 506 507 return (0); 508 } 509 510 /* 511 * bridge_clone_destroy: 512 * 513 * Destroy a bridge instance. 514 */ 515 static void 516 bridge_clone_destroy(struct ifnet *ifp) 517 { 518 struct bridge_softc *sc = ifp->if_softc; 519 struct bridge_iflist *bif; 520 521 BRIDGE_LOCK(sc); 522 523 bridge_stop(ifp, 1); 524 ifp->if_flags &= ~IFF_UP; 525 526 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 527 bridge_delete_member(sc, bif, 0); 528 529 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 530 bridge_delete_span(sc, bif); 531 } 532 533 BRIDGE_UNLOCK(sc); 534 535 callout_drain(&sc->sc_brcallout); 536 callout_drain(&sc->sc_bstpcallout); 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 if_free_type(ifp, IFT_ETHER); 544 545 /* Tear down the routing table. */ 546 bridge_rtable_fini(sc); 547 548 BRIDGE_LOCK_DESTROY(sc); 549 free(sc, M_DEVBUF); 550 } 551 552 /* 553 * bridge_ioctl: 554 * 555 * Handle a control request from the operator. 556 */ 557 static int 558 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 559 { 560 struct bridge_softc *sc = ifp->if_softc; 561 struct thread *td = curthread; 562 union { 563 struct ifbreq ifbreq; 564 struct ifbifconf ifbifconf; 565 struct ifbareq ifbareq; 566 struct ifbaconf ifbaconf; 567 struct ifbrparam ifbrparam; 568 } args; 569 struct ifdrv *ifd = (struct ifdrv *) data; 570 const struct bridge_control *bc; 571 int error = 0; 572 573 BRIDGE_LOCK(sc); 574 575 switch (cmd) { 576 577 case SIOCADDMULTI: 578 case SIOCDELMULTI: 579 break; 580 581 case SIOCGDRVSPEC: 582 case SIOCSDRVSPEC: 583 if (ifd->ifd_cmd >= bridge_control_table_size) { 584 error = EINVAL; 585 break; 586 } 587 bc = &bridge_control_table[ifd->ifd_cmd]; 588 589 if (cmd == SIOCGDRVSPEC && 590 (bc->bc_flags & BC_F_COPYOUT) == 0) { 591 error = EINVAL; 592 break; 593 } 594 else if (cmd == SIOCSDRVSPEC && 595 (bc->bc_flags & BC_F_COPYOUT) != 0) { 596 error = EINVAL; 597 break; 598 } 599 600 if (bc->bc_flags & BC_F_SUSER) { 601 error = suser(td); 602 if (error) 603 break; 604 } 605 606 if (ifd->ifd_len != bc->bc_argsize || 607 ifd->ifd_len > sizeof(args)) { 608 error = EINVAL; 609 break; 610 } 611 612 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) && 629 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 630 /* 631 * If interface is marked down and it is running, 632 * then stop and disable it. 633 */ 634 bridge_stop(ifp, 1); 635 } else if ((ifp->if_flags & IFF_UP) && 636 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 637 /* 638 * If interface is marked up and it is stopped, then 639 * start it. 640 */ 641 BRIDGE_UNLOCK(sc); 642 (*ifp->if_init)(sc); 643 } 644 break; 645 646 case SIOCSIFMTU: 647 /* Do not allow the MTU to be changed on the bridge */ 648 error = EINVAL; 649 break; 650 651 default: 652 /* 653 * drop the lock as ether_ioctl() will call bridge_start() and 654 * cause the lock to be recursed. 655 */ 656 BRIDGE_UNLOCK(sc); 657 error = ether_ioctl(ifp, cmd, data); 658 break; 659 } 660 661 if (BRIDGE_LOCKED(sc)) 662 BRIDGE_UNLOCK(sc); 663 664 return (error); 665 } 666 667 /* 668 * bridge_lookup_member: 669 * 670 * Lookup a bridge member interface. 671 */ 672 static struct bridge_iflist * 673 bridge_lookup_member(struct bridge_softc *sc, const char *name) 674 { 675 struct bridge_iflist *bif; 676 struct ifnet *ifp; 677 678 BRIDGE_LOCK_ASSERT(sc); 679 680 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 681 ifp = bif->bif_ifp; 682 if (strcmp(ifp->if_xname, name) == 0) 683 return (bif); 684 } 685 686 return (NULL); 687 } 688 689 /* 690 * bridge_lookup_member_if: 691 * 692 * Lookup a bridge member interface by ifnet*. 693 */ 694 static struct bridge_iflist * 695 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 696 { 697 struct bridge_iflist *bif; 698 699 BRIDGE_LOCK_ASSERT(sc); 700 701 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 702 if (bif->bif_ifp == member_ifp) 703 return (bif); 704 } 705 706 return (NULL); 707 } 708 709 /* 710 * bridge_delete_member: 711 * 712 * Delete the specified member interface. 713 */ 714 static void 715 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 716 int gone) 717 { 718 struct ifnet *ifs = bif->bif_ifp; 719 720 BRIDGE_LOCK_ASSERT(sc); 721 722 if (!gone) { 723 switch (ifs->if_type) { 724 case IFT_ETHER: 725 case IFT_L2VLAN: 726 /* 727 * Take the interface out of promiscuous mode. 728 */ 729 (void) ifpromisc(ifs, 0); 730 break; 731 732 case IFT_GIF: 733 break; 734 735 default: 736 #ifdef DIAGNOSTIC 737 panic("bridge_delete_member: impossible"); 738 #endif 739 break; 740 } 741 } 742 743 ifs->if_bridge = NULL; 744 BRIDGE_XLOCK(sc); 745 LIST_REMOVE(bif, bif_next); 746 BRIDGE_XDROP(sc); 747 748 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 749 750 free(bif, M_DEVBUF); 751 752 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 753 bstp_initialization(sc); 754 } 755 756 /* 757 * bridge_delete_span: 758 * 759 * Delete the specified span interface. 760 */ 761 static void 762 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 763 { 764 BRIDGE_LOCK_ASSERT(sc); 765 766 KASSERT(bif->bif_ifp->if_bridge == NULL, 767 ("%s: not a span interface", __func__)); 768 769 LIST_REMOVE(bif, bif_next); 770 free(bif, M_DEVBUF); 771 } 772 773 static int 774 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 775 { 776 struct ifbreq *req = arg; 777 struct bridge_iflist *bif = NULL; 778 struct ifnet *ifs; 779 int error = 0; 780 781 BRIDGE_LOCK_ASSERT(sc); 782 783 ifs = ifunit(req->ifbr_ifsname); 784 if (ifs == NULL) 785 return (ENOENT); 786 787 /* If it's in the span list, it can't be a member. */ 788 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 789 if (ifs == bif->bif_ifp) 790 return (EBUSY); 791 792 /* Allow the first Ethernet member to define the MTU */ 793 if (ifs->if_type != IFT_GIF) { 794 if (LIST_EMPTY(&sc->sc_iflist)) 795 sc->sc_ifp->if_mtu = ifs->if_mtu; 796 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 797 if_printf(sc->sc_ifp, "invalid MTU for %s\n", 798 ifs->if_xname); 799 return (EINVAL); 800 } 801 } 802 803 if (ifs->if_bridge == sc) 804 return (EEXIST); 805 806 if (ifs->if_bridge != NULL) 807 return (EBUSY); 808 809 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 810 if (bif == NULL) 811 return (ENOMEM); 812 813 switch (ifs->if_type) { 814 case IFT_ETHER: 815 case IFT_L2VLAN: 816 /* 817 * Place the interface into promiscuous mode. 818 */ 819 error = ifpromisc(ifs, 1); 820 if (error) 821 goto out; 822 break; 823 824 case IFT_GIF: 825 break; 826 827 default: 828 error = EINVAL; 829 goto out; 830 } 831 832 bif->bif_ifp = ifs; 833 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 834 bif->bif_priority = BSTP_DEFAULT_PORT_PRIORITY; 835 bif->bif_path_cost = BSTP_DEFAULT_PATH_COST; 836 837 ifs->if_bridge = sc; 838 /* 839 * XXX: XLOCK HERE!?! 840 * 841 * NOTE: insert_***HEAD*** should be safe for the traversals. 842 */ 843 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 844 845 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 846 bstp_initialization(sc); 847 else 848 bstp_stop(sc); 849 850 out: 851 if (error) { 852 if (bif != NULL) 853 free(bif, M_DEVBUF); 854 } 855 return (error); 856 } 857 858 static int 859 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 860 { 861 struct ifbreq *req = arg; 862 struct bridge_iflist *bif; 863 864 BRIDGE_LOCK_ASSERT(sc); 865 866 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 867 if (bif == NULL) 868 return (ENOENT); 869 870 bridge_delete_member(sc, bif, 0); 871 872 return (0); 873 } 874 875 static int 876 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 877 { 878 struct ifbreq *req = arg; 879 struct bridge_iflist *bif; 880 881 BRIDGE_LOCK_ASSERT(sc); 882 883 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 884 if (bif == NULL) 885 return (ENOENT); 886 887 req->ifbr_ifsflags = bif->bif_flags; 888 req->ifbr_state = bif->bif_state; 889 req->ifbr_priority = bif->bif_priority; 890 req->ifbr_path_cost = bif->bif_path_cost; 891 req->ifbr_portno = bif->bif_ifp->if_index & 0xff; 892 893 return (0); 894 } 895 896 static int 897 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 898 { 899 struct ifbreq *req = arg; 900 struct bridge_iflist *bif; 901 902 BRIDGE_LOCK_ASSERT(sc); 903 904 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 905 if (bif == NULL) 906 return (ENOENT); 907 908 if (req->ifbr_ifsflags & IFBIF_SPAN) 909 /* SPAN is readonly */ 910 return (EINVAL); 911 912 if (req->ifbr_ifsflags & IFBIF_STP) { 913 switch (bif->bif_ifp->if_type) { 914 case IFT_ETHER: 915 /* These can do spanning tree. */ 916 break; 917 918 default: 919 /* Nothing else can. */ 920 return (EINVAL); 921 } 922 } 923 924 bif->bif_flags = req->ifbr_ifsflags; 925 926 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 927 bstp_initialization(sc); 928 929 return (0); 930 } 931 932 static int 933 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 934 { 935 struct ifbrparam *param = arg; 936 937 BRIDGE_LOCK_ASSERT(sc); 938 939 sc->sc_brtmax = param->ifbrp_csize; 940 bridge_rttrim(sc); 941 942 return (0); 943 } 944 945 static int 946 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 947 { 948 struct ifbrparam *param = arg; 949 950 BRIDGE_LOCK_ASSERT(sc); 951 952 param->ifbrp_csize = sc->sc_brtmax; 953 954 return (0); 955 } 956 957 static int 958 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 959 { 960 struct ifbifconf *bifc = arg; 961 struct bridge_iflist *bif; 962 struct ifbreq breq; 963 int count, len, error = 0; 964 965 BRIDGE_LOCK_ASSERT(sc); 966 967 count = 0; 968 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 969 count++; 970 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 971 count++; 972 973 if (bifc->ifbic_len == 0) { 974 bifc->ifbic_len = sizeof(breq) * count; 975 return (0); 976 } 977 978 count = 0; 979 len = bifc->ifbic_len; 980 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 981 if (len < sizeof(breq)) 982 break; 983 984 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 985 sizeof(breq.ifbr_ifsname)); 986 breq.ifbr_ifsflags = bif->bif_flags; 987 breq.ifbr_state = bif->bif_state; 988 breq.ifbr_priority = bif->bif_priority; 989 breq.ifbr_path_cost = bif->bif_path_cost; 990 breq.ifbr_portno = bif->bif_ifp->if_index & 0xff; 991 error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq)); 992 if (error) 993 break; 994 count++; 995 len -= sizeof(breq); 996 } 997 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 998 if (len < sizeof(breq)) 999 break; 1000 1001 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1002 sizeof(breq.ifbr_ifsname)); 1003 breq.ifbr_ifsflags = bif->bif_flags; 1004 breq.ifbr_state = bif->bif_state; 1005 breq.ifbr_priority = bif->bif_priority; 1006 breq.ifbr_path_cost = bif->bif_path_cost; 1007 breq.ifbr_portno = bif->bif_ifp->if_index & 0xff; 1008 error = copyout(&breq, bifc->ifbic_req + count, sizeof(breq)); 1009 if (error) 1010 break; 1011 count++; 1012 len -= sizeof(breq); 1013 } 1014 1015 bifc->ifbic_len = sizeof(breq) * count; 1016 return (error); 1017 } 1018 1019 static int 1020 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1021 { 1022 struct ifbaconf *bac = arg; 1023 struct bridge_rtnode *brt; 1024 struct ifbareq bareq; 1025 struct timeval tv; 1026 int count = 0, error = 0, len; 1027 1028 BRIDGE_LOCK_ASSERT(sc); 1029 1030 if (bac->ifbac_len == 0) 1031 return (0); 1032 1033 getmicrotime(&tv); 1034 1035 len = bac->ifbac_len; 1036 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1037 if (len < sizeof(bareq)) 1038 goto out; 1039 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1040 sizeof(bareq.ifba_ifsname)); 1041 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1042 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1043 tv.tv_sec < brt->brt_expire) 1044 bareq.ifba_expire = brt->brt_expire - tv.tv_sec; 1045 else 1046 bareq.ifba_expire = 0; 1047 bareq.ifba_flags = brt->brt_flags; 1048 1049 error = copyout(&bareq, bac->ifbac_req + count, sizeof(bareq)); 1050 if (error) 1051 goto out; 1052 count++; 1053 len -= sizeof(bareq); 1054 } 1055 out: 1056 bac->ifbac_len = sizeof(bareq) * count; 1057 return (error); 1058 } 1059 1060 static int 1061 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1062 { 1063 struct ifbareq *req = arg; 1064 struct bridge_iflist *bif; 1065 int error; 1066 1067 BRIDGE_LOCK_ASSERT(sc); 1068 1069 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1070 if (bif == NULL) 1071 return (ENOENT); 1072 1073 error = bridge_rtupdate(sc, req->ifba_dst, bif->bif_ifp, 1, 1074 req->ifba_flags); 1075 1076 return (error); 1077 } 1078 1079 static int 1080 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1081 { 1082 struct ifbrparam *param = arg; 1083 1084 BRIDGE_LOCK_ASSERT(sc); 1085 1086 sc->sc_brttimeout = param->ifbrp_ctime; 1087 1088 return (0); 1089 } 1090 1091 static int 1092 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1093 { 1094 struct ifbrparam *param = arg; 1095 1096 BRIDGE_LOCK_ASSERT(sc); 1097 1098 param->ifbrp_ctime = sc->sc_brttimeout; 1099 1100 return (0); 1101 } 1102 1103 static int 1104 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1105 { 1106 struct ifbareq *req = arg; 1107 1108 BRIDGE_LOCK_ASSERT(sc); 1109 1110 return (bridge_rtdaddr(sc, req->ifba_dst)); 1111 } 1112 1113 static int 1114 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1115 { 1116 struct ifbreq *req = arg; 1117 1118 BRIDGE_LOCK_ASSERT(sc); 1119 1120 bridge_rtflush(sc, req->ifbr_ifsflags); 1121 1122 return (0); 1123 } 1124 1125 static int 1126 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1127 { 1128 struct ifbrparam *param = arg; 1129 1130 BRIDGE_LOCK_ASSERT(sc); 1131 1132 param->ifbrp_prio = sc->sc_bridge_priority; 1133 1134 return (0); 1135 } 1136 1137 static int 1138 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1139 { 1140 struct ifbrparam *param = arg; 1141 1142 BRIDGE_LOCK_ASSERT(sc); 1143 1144 sc->sc_bridge_priority = param->ifbrp_prio; 1145 1146 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 1147 bstp_initialization(sc); 1148 1149 return (0); 1150 } 1151 1152 static int 1153 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1154 { 1155 struct ifbrparam *param = arg; 1156 1157 BRIDGE_LOCK_ASSERT(sc); 1158 1159 param->ifbrp_hellotime = sc->sc_bridge_hello_time >> 8; 1160 1161 return (0); 1162 } 1163 1164 static int 1165 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1166 { 1167 struct ifbrparam *param = arg; 1168 1169 BRIDGE_LOCK_ASSERT(sc); 1170 1171 if (param->ifbrp_hellotime == 0) 1172 return (EINVAL); 1173 sc->sc_bridge_hello_time = param->ifbrp_hellotime << 8; 1174 1175 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 1176 bstp_initialization(sc); 1177 1178 return (0); 1179 } 1180 1181 static int 1182 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1183 { 1184 struct ifbrparam *param = arg; 1185 1186 BRIDGE_LOCK_ASSERT(sc); 1187 1188 param->ifbrp_fwddelay = sc->sc_bridge_forward_delay >> 8; 1189 1190 return (0); 1191 } 1192 1193 static int 1194 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1195 { 1196 struct ifbrparam *param = arg; 1197 1198 BRIDGE_LOCK_ASSERT(sc); 1199 1200 if (param->ifbrp_fwddelay == 0) 1201 return (EINVAL); 1202 sc->sc_bridge_forward_delay = param->ifbrp_fwddelay << 8; 1203 1204 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 1205 bstp_initialization(sc); 1206 1207 return (0); 1208 } 1209 1210 static int 1211 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1212 { 1213 struct ifbrparam *param = arg; 1214 1215 BRIDGE_LOCK_ASSERT(sc); 1216 1217 param->ifbrp_maxage = sc->sc_bridge_max_age >> 8; 1218 1219 return (0); 1220 } 1221 1222 static int 1223 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1224 { 1225 struct ifbrparam *param = arg; 1226 1227 BRIDGE_LOCK_ASSERT(sc); 1228 1229 if (param->ifbrp_maxage == 0) 1230 return (EINVAL); 1231 sc->sc_bridge_max_age = param->ifbrp_maxage << 8; 1232 1233 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 1234 bstp_initialization(sc); 1235 1236 return (0); 1237 } 1238 1239 static int 1240 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1241 { 1242 struct ifbreq *req = arg; 1243 struct bridge_iflist *bif; 1244 1245 BRIDGE_LOCK_ASSERT(sc); 1246 1247 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1248 if (bif == NULL) 1249 return (ENOENT); 1250 1251 bif->bif_priority = req->ifbr_priority; 1252 1253 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 1254 bstp_initialization(sc); 1255 1256 return (0); 1257 } 1258 1259 static int 1260 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1261 { 1262 struct ifbreq *req = arg; 1263 struct bridge_iflist *bif; 1264 1265 BRIDGE_LOCK_ASSERT(sc); 1266 1267 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1268 if (bif == NULL) 1269 return (ENOENT); 1270 1271 bif->bif_path_cost = req->ifbr_path_cost; 1272 1273 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 1274 bstp_initialization(sc); 1275 1276 return (0); 1277 } 1278 1279 static int 1280 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1281 { 1282 struct ifbreq *req = arg; 1283 struct bridge_iflist *bif = NULL; 1284 struct ifnet *ifs; 1285 1286 BRIDGE_LOCK_ASSERT(sc); 1287 1288 ifs = ifunit(req->ifbr_ifsname); 1289 if (ifs == NULL) 1290 return (ENOENT); 1291 1292 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1293 if (ifs == bif->bif_ifp) 1294 return (EBUSY); 1295 1296 if (ifs->if_bridge != NULL) 1297 return (EBUSY); 1298 1299 switch (ifs->if_type) { 1300 case IFT_ETHER: 1301 case IFT_L2VLAN: 1302 break; 1303 default: 1304 return (EINVAL); 1305 } 1306 1307 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1308 if (bif == NULL) 1309 return (ENOMEM); 1310 1311 bif->bif_ifp = ifs; 1312 bif->bif_flags = IFBIF_SPAN; 1313 1314 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1315 1316 return (0); 1317 } 1318 1319 static int 1320 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1321 { 1322 struct ifbreq *req = arg; 1323 struct bridge_iflist *bif; 1324 struct ifnet *ifs; 1325 1326 BRIDGE_LOCK_ASSERT(sc); 1327 1328 ifs = ifunit(req->ifbr_ifsname); 1329 if (ifs == NULL) 1330 return (ENOENT); 1331 1332 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1333 if (ifs == bif->bif_ifp) 1334 break; 1335 1336 if (bif == NULL) 1337 return (ENOENT); 1338 1339 bridge_delete_span(sc, bif); 1340 1341 return (0); 1342 } 1343 1344 /* 1345 * bridge_ifdetach: 1346 * 1347 * Detach an interface from a bridge. Called when a member 1348 * interface is detaching. 1349 */ 1350 static void 1351 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1352 { 1353 struct bridge_softc *sc = ifp->if_bridge; 1354 struct bridge_iflist *bif; 1355 1356 /* Check if the interface is a bridge member */ 1357 if (sc != NULL) { 1358 BRIDGE_LOCK(sc); 1359 1360 bif = bridge_lookup_member_if(sc, ifp); 1361 if (bif != NULL) 1362 bridge_delete_member(sc, bif, 1); 1363 1364 1365 BRIDGE_UNLOCK(sc); 1366 return; 1367 } 1368 1369 /* Check if the interface is a span port */ 1370 mtx_lock(&bridge_list_mtx); 1371 LIST_FOREACH(sc, &bridge_list, sc_list) { 1372 BRIDGE_LOCK(sc); 1373 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1374 if (ifp == bif->bif_ifp) { 1375 bridge_delete_span(sc, bif); 1376 break; 1377 } 1378 1379 BRIDGE_UNLOCK(sc); 1380 } 1381 mtx_unlock(&bridge_list_mtx); 1382 } 1383 1384 /* 1385 * bridge_init: 1386 * 1387 * Initialize a bridge interface. 1388 */ 1389 static void 1390 bridge_init(void *xsc) 1391 { 1392 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1393 struct ifnet *ifp = sc->sc_ifp; 1394 1395 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1396 return; 1397 1398 BRIDGE_LOCK(sc); 1399 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1400 bridge_timer, sc); 1401 1402 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1403 bstp_initialization(sc); 1404 BRIDGE_UNLOCK(sc); 1405 return; 1406 } 1407 1408 /* 1409 * bridge_stop: 1410 * 1411 * Stop the bridge interface. 1412 */ 1413 static void 1414 bridge_stop(struct ifnet *ifp, int disable) 1415 { 1416 struct bridge_softc *sc = ifp->if_softc; 1417 1418 BRIDGE_LOCK_ASSERT(sc); 1419 1420 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1421 return; 1422 1423 callout_stop(&sc->sc_brcallout); 1424 bstp_stop(sc); 1425 1426 bridge_rtflush(sc, IFBF_FLUSHDYN); 1427 1428 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1429 } 1430 1431 /* 1432 * bridge_enqueue: 1433 * 1434 * Enqueue a packet on a bridge member interface. 1435 * 1436 */ 1437 __inline void 1438 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1439 { 1440 int len, err; 1441 short mflags; 1442 1443 /* 1444 * Clear any in-bound checksum flags for this packet. 1445 */ 1446 m->m_pkthdr.csum_flags = 0; 1447 1448 len = m->m_pkthdr.len; 1449 mflags = m->m_flags; 1450 1451 IFQ_ENQUEUE(&dst_ifp->if_snd, m, err); 1452 if (err == 0) { 1453 1454 sc->sc_ifp->if_opackets++; 1455 sc->sc_ifp->if_obytes += len; 1456 1457 dst_ifp->if_obytes += len; 1458 1459 if (mflags & M_MCAST) { 1460 sc->sc_ifp->if_omcasts++; 1461 dst_ifp->if_omcasts++; 1462 } 1463 } 1464 1465 if ((dst_ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0) 1466 (*dst_ifp->if_start)(dst_ifp); 1467 } 1468 1469 /* 1470 * bridge_dummynet: 1471 * 1472 * Receive a queued packet from dummynet and pass it on to the output 1473 * interface. 1474 * 1475 * The mbuf has the Ethernet header already attached. 1476 */ 1477 static void 1478 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1479 { 1480 struct bridge_softc *sc; 1481 1482 sc = ifp->if_bridge; 1483 1484 /* 1485 * The packet didnt originate from a member interface. This should only 1486 * ever happen if a member interface is removed while packets are 1487 * queued for it. 1488 */ 1489 if (sc == NULL) { 1490 m_freem(m); 1491 return; 1492 } 1493 1494 if (inet_pfil_hook.ph_busy_count >= 0 1495 #ifdef INET6 1496 || inet6_pfil_hook.ph_busy_count >= 0 1497 #endif 1498 ) { 1499 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1500 return; 1501 if (m == NULL) 1502 return; 1503 } 1504 1505 bridge_enqueue(sc, ifp, m); 1506 } 1507 1508 /* 1509 * bridge_output: 1510 * 1511 * Send output from a bridge member interface. This 1512 * performs the bridging function for locally originated 1513 * packets. 1514 * 1515 * The mbuf has the Ethernet header already attached. We must 1516 * enqueue or free the mbuf before returning. 1517 */ 1518 static int 1519 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1520 struct rtentry *rt) 1521 { 1522 struct ether_header *eh; 1523 struct ifnet *dst_if; 1524 struct bridge_softc *sc; 1525 1526 if (m->m_len < ETHER_HDR_LEN) { 1527 m = m_pullup(m, ETHER_HDR_LEN); 1528 if (m == NULL) 1529 return (0); 1530 } 1531 1532 eh = mtod(m, struct ether_header *); 1533 sc = ifp->if_bridge; 1534 1535 BRIDGE_LOCK(sc); 1536 1537 /* 1538 * If bridge is down, but the original output interface is up, 1539 * go ahead and send out that interface. Otherwise, the packet 1540 * is dropped below. 1541 */ 1542 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1543 dst_if = ifp; 1544 goto sendunicast; 1545 } 1546 1547 /* 1548 * If the packet is a multicast, or we don't know a better way to 1549 * get there, send to all interfaces. 1550 */ 1551 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1552 dst_if = NULL; 1553 else 1554 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1555 if (dst_if == NULL) { 1556 struct bridge_iflist *bif; 1557 struct mbuf *mc; 1558 int error = 0, used = 0; 1559 1560 BRIDGE_LOCK2REF(sc, error); 1561 if (error) { 1562 m_freem(m); 1563 return (0); 1564 } 1565 1566 bridge_span(sc, m); 1567 1568 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1569 dst_if = bif->bif_ifp; 1570 1571 if (dst_if->if_type == IFT_GIF) 1572 continue; 1573 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 1574 continue; 1575 1576 /* 1577 * If this is not the original output interface, 1578 * and the interface is participating in spanning 1579 * tree, make sure the port is in a state that 1580 * allows forwarding. 1581 */ 1582 if (dst_if != ifp && 1583 (bif->bif_flags & IFBIF_STP) != 0) { 1584 switch (bif->bif_state) { 1585 case BSTP_IFSTATE_BLOCKING: 1586 case BSTP_IFSTATE_LISTENING: 1587 case BSTP_IFSTATE_DISABLED: 1588 continue; 1589 } 1590 } 1591 1592 if (LIST_NEXT(bif, bif_next) == NULL) { 1593 used = 1; 1594 mc = m; 1595 } else { 1596 mc = m_copypacket(m, M_DONTWAIT); 1597 if (mc == NULL) { 1598 sc->sc_ifp->if_oerrors++; 1599 continue; 1600 } 1601 } 1602 1603 bridge_enqueue(sc, dst_if, mc); 1604 } 1605 if (used == 0) 1606 m_freem(m); 1607 BRIDGE_UNREF(sc); 1608 return (0); 1609 } 1610 1611 sendunicast: 1612 /* 1613 * XXX Spanning tree consideration here? 1614 */ 1615 1616 bridge_span(sc, m); 1617 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1618 m_freem(m); 1619 BRIDGE_UNLOCK(sc); 1620 return (0); 1621 } 1622 1623 BRIDGE_UNLOCK(sc); 1624 bridge_enqueue(sc, dst_if, m); 1625 return (0); 1626 } 1627 1628 /* 1629 * bridge_start: 1630 * 1631 * Start output on a bridge. 1632 * 1633 */ 1634 static void 1635 bridge_start(struct ifnet *ifp) 1636 { 1637 struct bridge_softc *sc; 1638 struct mbuf *m; 1639 struct ether_header *eh; 1640 struct ifnet *dst_if; 1641 1642 sc = ifp->if_softc; 1643 1644 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 1645 for (;;) { 1646 IFQ_DEQUEUE(&ifp->if_snd, m); 1647 if (m == 0) 1648 break; 1649 BPF_MTAP(ifp, m); 1650 1651 eh = mtod(m, struct ether_header *); 1652 dst_if = NULL; 1653 1654 BRIDGE_LOCK(sc); 1655 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1656 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1657 } 1658 1659 if (dst_if == NULL) 1660 bridge_broadcast(sc, ifp, m, 0); 1661 else { 1662 BRIDGE_UNLOCK(sc); 1663 bridge_enqueue(sc, dst_if, m); 1664 } 1665 } 1666 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1667 1668 return; 1669 } 1670 1671 /* 1672 * bridge_forward: 1673 * 1674 * The forwarding function of the bridge. 1675 * 1676 * NOTE: Releases the lock on return. 1677 */ 1678 static void 1679 bridge_forward(struct bridge_softc *sc, struct mbuf *m) 1680 { 1681 struct bridge_iflist *bif; 1682 struct ifnet *src_if, *dst_if, *ifp; 1683 struct ether_header *eh; 1684 1685 src_if = m->m_pkthdr.rcvif; 1686 BRIDGE_LOCK_ASSERT(sc); 1687 ifp = sc->sc_ifp; 1688 1689 sc->sc_ifp->if_ipackets++; 1690 sc->sc_ifp->if_ibytes += m->m_pkthdr.len; 1691 1692 /* 1693 * Look up the bridge_iflist. 1694 */ 1695 bif = bridge_lookup_member_if(sc, src_if); 1696 if (bif == NULL) { 1697 /* Interface is not a bridge member (anymore?) */ 1698 BRIDGE_UNLOCK(sc); 1699 m_freem(m); 1700 return; 1701 } 1702 1703 if (bif->bif_flags & IFBIF_STP) { 1704 switch (bif->bif_state) { 1705 case BSTP_IFSTATE_BLOCKING: 1706 case BSTP_IFSTATE_LISTENING: 1707 case BSTP_IFSTATE_DISABLED: 1708 BRIDGE_UNLOCK(sc); 1709 m_freem(m); 1710 return; 1711 } 1712 } 1713 1714 eh = mtod(m, struct ether_header *); 1715 1716 /* 1717 * If the interface is learning, and the source 1718 * address is valid and not multicast, record 1719 * the address. 1720 */ 1721 if ((bif->bif_flags & IFBIF_LEARNING) != 0 && 1722 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1723 (eh->ether_shost[0] == 0 && 1724 eh->ether_shost[1] == 0 && 1725 eh->ether_shost[2] == 0 && 1726 eh->ether_shost[3] == 0 && 1727 eh->ether_shost[4] == 0 && 1728 eh->ether_shost[5] == 0) == 0) { 1729 (void) bridge_rtupdate(sc, eh->ether_shost, 1730 src_if, 0, IFBAF_DYNAMIC); 1731 } 1732 1733 if ((bif->bif_flags & IFBIF_STP) != 0 && 1734 bif->bif_state == BSTP_IFSTATE_LEARNING) { 1735 m_freem(m); 1736 BRIDGE_UNLOCK(sc); 1737 return; 1738 } 1739 1740 /* 1741 * At this point, the port either doesn't participate 1742 * in spanning tree or it is in the forwarding state. 1743 */ 1744 1745 /* 1746 * If the packet is unicast, destined for someone on 1747 * "this" side of the bridge, drop it. 1748 */ 1749 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1750 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1751 if (src_if == dst_if) { 1752 BRIDGE_UNLOCK(sc); 1753 m_freem(m); 1754 return; 1755 } 1756 } else { 1757 /* ...forward it to all interfaces. */ 1758 sc->sc_ifp->if_imcasts++; 1759 dst_if = NULL; 1760 } 1761 1762 /* run the packet filter */ 1763 if (inet_pfil_hook.ph_busy_count >= 0 1764 #ifdef INET6 1765 || inet6_pfil_hook.ph_busy_count >= 0 1766 #endif 1767 ) { 1768 BRIDGE_UNLOCK(sc); 1769 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 1770 return; 1771 if (m == NULL) 1772 return; 1773 BRIDGE_LOCK(sc); 1774 } 1775 1776 if (dst_if == NULL) { 1777 /* 1778 * Tap off packets passing the bridge. Broadcast packets will 1779 * already be tapped as they are reinjected into ether_input. 1780 */ 1781 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) 1782 BPF_MTAP(ifp, m); 1783 1784 bridge_broadcast(sc, src_if, m, 1); 1785 return; 1786 } 1787 1788 /* 1789 * At this point, we're dealing with a unicast frame 1790 * going to a different interface. 1791 */ 1792 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1793 BRIDGE_UNLOCK(sc); 1794 m_freem(m); 1795 return; 1796 } 1797 bif = bridge_lookup_member_if(sc, dst_if); 1798 if (bif == NULL) { 1799 /* Not a member of the bridge (anymore?) */ 1800 BRIDGE_UNLOCK(sc); 1801 m_freem(m); 1802 return; 1803 } 1804 1805 if (bif->bif_flags & IFBIF_STP) { 1806 switch (bif->bif_state) { 1807 case BSTP_IFSTATE_DISABLED: 1808 case BSTP_IFSTATE_BLOCKING: 1809 BRIDGE_UNLOCK(sc); 1810 m_freem(m); 1811 return; 1812 } 1813 } 1814 1815 /* tap off packets passing the bridge */ 1816 BPF_MTAP(ifp, m); 1817 1818 BRIDGE_UNLOCK(sc); 1819 1820 if (inet_pfil_hook.ph_busy_count >= 0 1821 #ifdef INET6 1822 || inet6_pfil_hook.ph_busy_count >= 0 1823 #endif 1824 ) { 1825 if (bridge_pfil(&m, sc->sc_ifp, dst_if, PFIL_OUT) != 0) 1826 return; 1827 if (m == NULL) 1828 return; 1829 } 1830 1831 bridge_enqueue(sc, dst_if, m); 1832 } 1833 1834 /* 1835 * bridge_input: 1836 * 1837 * Receive input from a member interface. Queue the packet for 1838 * bridging if it is not for us. 1839 */ 1840 static struct mbuf * 1841 bridge_input(struct ifnet *ifp, struct mbuf *m) 1842 { 1843 struct bridge_softc *sc = ifp->if_bridge; 1844 struct bridge_iflist *bif; 1845 struct ifnet *bifp; 1846 struct ether_header *eh; 1847 struct mbuf *mc, *mc2; 1848 1849 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1850 return (m); 1851 1852 bifp = sc->sc_ifp; 1853 1854 BRIDGE_LOCK(sc); 1855 bif = bridge_lookup_member_if(sc, ifp); 1856 if (bif == NULL) { 1857 BRIDGE_UNLOCK(sc); 1858 return (m); 1859 } 1860 1861 eh = mtod(m, struct ether_header *); 1862 1863 if (memcmp(eh->ether_dhost, IF_LLADDR(bifp), 1864 ETHER_ADDR_LEN) == 0) { 1865 /* 1866 * If the packet is for us, set the packets source as the 1867 * bridge, and return the packet back to ether_input for 1868 * local processing. 1869 */ 1870 1871 /* XXX Do we tap the packet for the member interface too? 1872 * BPF_MTAP(&m->m_pkthdr.rcvif, m); 1873 */ 1874 1875 /* Mark the packet as arriving on the bridge interface */ 1876 m->m_pkthdr.rcvif = bifp; 1877 BPF_MTAP(bifp, m); 1878 bifp->if_ipackets++; 1879 1880 BRIDGE_UNLOCK(sc); 1881 return (m); 1882 } 1883 1884 bridge_span(sc, m); 1885 1886 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 1887 /* Tap off 802.1D packets; they do not get forwarded. */ 1888 if (memcmp(eh->ether_dhost, bstp_etheraddr, 1889 ETHER_ADDR_LEN) == 0) { 1890 m = bstp_input(ifp, m); 1891 if (m == NULL) { 1892 BRIDGE_UNLOCK(sc); 1893 return (NULL); 1894 } 1895 } 1896 1897 if (bif->bif_flags & IFBIF_STP) { 1898 switch (bif->bif_state) { 1899 case BSTP_IFSTATE_BLOCKING: 1900 case BSTP_IFSTATE_LISTENING: 1901 case BSTP_IFSTATE_DISABLED: 1902 BRIDGE_UNLOCK(sc); 1903 return (m); 1904 } 1905 } 1906 1907 if (bcmp(etherbroadcastaddr, eh->ether_dhost, 1908 sizeof(etherbroadcastaddr)) == 0) 1909 m->m_flags |= M_BCAST; 1910 else 1911 m->m_flags |= M_MCAST; 1912 1913 /* 1914 * Make a deep copy of the packet and enqueue the copy 1915 * for bridge processing; return the original packet for 1916 * local processing. 1917 */ 1918 mc = m_dup(m, M_DONTWAIT); 1919 if (mc == NULL) { 1920 BRIDGE_UNLOCK(sc); 1921 return (m); 1922 } 1923 1924 /* Perform the bridge forwarding function with the copy. */ 1925 bridge_forward(sc, mc); 1926 1927 /* 1928 * Reinject the mbuf as arriving on the bridge so we have a 1929 * chance at claiming multicast packets. We can not loop back 1930 * here from ether_input as a bridge is never a member of a 1931 * bridge. 1932 */ 1933 KASSERT(bifp->if_bridge == NULL, 1934 ("loop created in bridge_input")); 1935 mc2 = m_dup(m, M_DONTWAIT); 1936 if (mc2 != NULL) { 1937 /* Keep the layer3 header aligned */ 1938 int i = min(mc2->m_pkthdr.len, max_protohdr); 1939 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 1940 } 1941 if (mc2 != NULL) { 1942 mc2->m_pkthdr.rcvif = bifp; 1943 (*bifp->if_input)(bifp, mc2); 1944 } 1945 1946 /* Return the original packet for local processing. */ 1947 return (m); 1948 } 1949 1950 if (bif->bif_flags & IFBIF_STP) { 1951 switch (bif->bif_state) { 1952 case BSTP_IFSTATE_BLOCKING: 1953 case BSTP_IFSTATE_LISTENING: 1954 case BSTP_IFSTATE_DISABLED: 1955 BRIDGE_UNLOCK(sc); 1956 return (m); 1957 } 1958 } 1959 1960 /* 1961 * Unicast. Make sure it's not for us. 1962 */ 1963 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1964 if(bif->bif_ifp->if_type == IFT_GIF) 1965 continue; 1966 /* It is destined for us. */ 1967 if (memcmp(IF_LLADDR(bif->bif_ifp), eh->ether_dhost, 1968 ETHER_ADDR_LEN) == 0) { 1969 if (bif->bif_flags & IFBIF_LEARNING) 1970 (void) bridge_rtupdate(sc, 1971 eh->ether_shost, ifp, 0, IFBAF_DYNAMIC); 1972 m->m_pkthdr.rcvif = bif->bif_ifp; 1973 BRIDGE_UNLOCK(sc); 1974 return (m); 1975 } 1976 1977 /* We just received a packet that we sent out. */ 1978 if (memcmp(IF_LLADDR(bif->bif_ifp), eh->ether_shost, 1979 ETHER_ADDR_LEN) == 0) { 1980 BRIDGE_UNLOCK(sc); 1981 m_freem(m); 1982 return (NULL); 1983 } 1984 } 1985 1986 /* Perform the bridge forwarding function. */ 1987 bridge_forward(sc, m); 1988 1989 return (NULL); 1990 } 1991 1992 /* 1993 * bridge_broadcast: 1994 * 1995 * Send a frame to all interfaces that are members of 1996 * the bridge, except for the one on which the packet 1997 * arrived. 1998 * 1999 * NOTE: Releases the lock on return. 2000 */ 2001 static void 2002 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2003 struct mbuf *m, int runfilt) 2004 { 2005 struct bridge_iflist *bif; 2006 struct mbuf *mc; 2007 struct ifnet *dst_if; 2008 int error = 0, used = 0; 2009 2010 BRIDGE_LOCK_ASSERT(sc); 2011 BRIDGE_LOCK2REF(sc, error); 2012 if (error) { 2013 m_freem(m); 2014 return; 2015 } 2016 2017 /* Filter on the bridge interface before broadcasting */ 2018 if (runfilt && (inet_pfil_hook.ph_busy_count >= 0 2019 #ifdef INET6 2020 || inet6_pfil_hook.ph_busy_count >= 0 2021 #endif 2022 )) { 2023 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2024 goto out; 2025 if (m == NULL) 2026 goto out; 2027 } 2028 2029 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2030 dst_if = bif->bif_ifp; 2031 if (dst_if == src_if) 2032 continue; 2033 2034 if (bif->bif_flags & IFBIF_STP) { 2035 switch (bif->bif_state) { 2036 case BSTP_IFSTATE_BLOCKING: 2037 case BSTP_IFSTATE_DISABLED: 2038 continue; 2039 } 2040 } 2041 2042 if ((bif->bif_flags & IFBIF_DISCOVER) == 0 && 2043 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2044 continue; 2045 2046 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2047 continue; 2048 2049 if (LIST_NEXT(bif, bif_next) == NULL) { 2050 mc = m; 2051 used = 1; 2052 } else { 2053 mc = m_copypacket(m, M_DONTWAIT); 2054 if (mc == NULL) { 2055 sc->sc_ifp->if_oerrors++; 2056 continue; 2057 } 2058 } 2059 2060 /* 2061 * Filter on the output interface. Pass a NULL bridge interface 2062 * pointer so we do not redundantly filter on the bridge for 2063 * each interface we broadcast on. 2064 */ 2065 if (runfilt && (inet_pfil_hook.ph_busy_count >= 0 2066 #ifdef INET6 2067 || inet6_pfil_hook.ph_busy_count >= 0 2068 #endif 2069 )) { 2070 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2071 continue; 2072 if (mc == NULL) 2073 continue; 2074 } 2075 2076 bridge_enqueue(sc, dst_if, mc); 2077 } 2078 if (used == 0) 2079 m_freem(m); 2080 2081 out: 2082 BRIDGE_UNREF(sc); 2083 } 2084 2085 /* 2086 * bridge_span: 2087 * 2088 * Duplicate a packet out one or more interfaces that are in span mode, 2089 * the original mbuf is unmodified. 2090 */ 2091 static void 2092 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2093 { 2094 struct bridge_iflist *bif; 2095 struct ifnet *dst_if; 2096 struct mbuf *mc; 2097 2098 if (LIST_EMPTY(&sc->sc_spanlist)) 2099 return; 2100 2101 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2102 dst_if = bif->bif_ifp; 2103 2104 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2105 continue; 2106 2107 mc = m_copypacket(m, M_DONTWAIT); 2108 if (mc == NULL) { 2109 sc->sc_ifp->if_oerrors++; 2110 continue; 2111 } 2112 2113 bridge_enqueue(sc, dst_if, mc); 2114 } 2115 } 2116 2117 /* 2118 * bridge_rtupdate: 2119 * 2120 * Add a bridge routing entry. 2121 */ 2122 static int 2123 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 2124 struct ifnet *dst_if, int setflags, uint8_t flags) 2125 { 2126 struct bridge_rtnode *brt; 2127 struct timeval tv; 2128 int error; 2129 2130 BRIDGE_LOCK_ASSERT(sc); 2131 2132 /* 2133 * A route for this destination might already exist. If so, 2134 * update it, otherwise create a new one. 2135 */ 2136 getmicrotime(&tv); 2137 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) { 2138 if (sc->sc_brtcnt >= sc->sc_brtmax) 2139 return (ENOSPC); 2140 2141 /* 2142 * Allocate a new bridge forwarding node, and 2143 * initialize the expiration time and Ethernet 2144 * address. 2145 */ 2146 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2147 if (brt == NULL) 2148 return (ENOMEM); 2149 2150 brt->brt_expire = tv.tv_sec + sc->sc_brttimeout; 2151 brt->brt_flags = IFBAF_DYNAMIC; 2152 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2153 2154 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2155 uma_zfree(bridge_rtnode_zone, brt); 2156 return (error); 2157 } 2158 } 2159 2160 brt->brt_ifp = dst_if; 2161 if (setflags) { 2162 brt->brt_flags = flags; 2163 brt->brt_expire = (flags & IFBAF_STATIC) ? 0 : 2164 tv.tv_sec + sc->sc_brttimeout; 2165 } 2166 2167 return (0); 2168 } 2169 2170 /* 2171 * bridge_rtlookup: 2172 * 2173 * Lookup the destination interface for an address. 2174 */ 2175 static struct ifnet * 2176 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2177 { 2178 struct bridge_rtnode *brt; 2179 2180 BRIDGE_LOCK_ASSERT(sc); 2181 2182 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 2183 return (NULL); 2184 2185 return (brt->brt_ifp); 2186 } 2187 2188 /* 2189 * bridge_rttrim: 2190 * 2191 * Trim the routine table so that we have a number 2192 * of routing entries less than or equal to the 2193 * maximum number. 2194 */ 2195 static void 2196 bridge_rttrim(struct bridge_softc *sc) 2197 { 2198 struct bridge_rtnode *brt, *nbrt; 2199 2200 BRIDGE_LOCK_ASSERT(sc); 2201 2202 /* Make sure we actually need to do this. */ 2203 if (sc->sc_brtcnt <= sc->sc_brtmax) 2204 return; 2205 2206 /* Force an aging cycle; this might trim enough addresses. */ 2207 bridge_rtage(sc); 2208 if (sc->sc_brtcnt <= sc->sc_brtmax) 2209 return; 2210 2211 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2212 nbrt = LIST_NEXT(brt, brt_list); 2213 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2214 bridge_rtnode_destroy(sc, brt); 2215 if (sc->sc_brtcnt <= sc->sc_brtmax) 2216 return; 2217 } 2218 } 2219 } 2220 2221 /* 2222 * bridge_timer: 2223 * 2224 * Aging timer for the bridge. 2225 */ 2226 static void 2227 bridge_timer(void *arg) 2228 { 2229 struct bridge_softc *sc = arg; 2230 2231 BRIDGE_LOCK_ASSERT(sc); 2232 2233 bridge_rtage(sc); 2234 2235 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2236 callout_reset(&sc->sc_brcallout, 2237 bridge_rtable_prune_period * hz, bridge_timer, sc); 2238 } 2239 2240 /* 2241 * bridge_rtage: 2242 * 2243 * Perform an aging cycle. 2244 */ 2245 static void 2246 bridge_rtage(struct bridge_softc *sc) 2247 { 2248 struct bridge_rtnode *brt, *nbrt; 2249 struct timeval tv; 2250 2251 BRIDGE_LOCK_ASSERT(sc); 2252 2253 getmicrotime(&tv); 2254 2255 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2256 nbrt = LIST_NEXT(brt, brt_list); 2257 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2258 if (tv.tv_sec >= brt->brt_expire) 2259 bridge_rtnode_destroy(sc, brt); 2260 } 2261 } 2262 } 2263 2264 /* 2265 * bridge_rtflush: 2266 * 2267 * Remove all dynamic addresses from the bridge. 2268 */ 2269 static void 2270 bridge_rtflush(struct bridge_softc *sc, int full) 2271 { 2272 struct bridge_rtnode *brt, *nbrt; 2273 2274 BRIDGE_LOCK_ASSERT(sc); 2275 2276 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2277 nbrt = LIST_NEXT(brt, brt_list); 2278 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2279 bridge_rtnode_destroy(sc, brt); 2280 } 2281 } 2282 2283 /* 2284 * bridge_rtdaddr: 2285 * 2286 * Remove an address from the table. 2287 */ 2288 static int 2289 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2290 { 2291 struct bridge_rtnode *brt; 2292 2293 BRIDGE_LOCK_ASSERT(sc); 2294 2295 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 2296 return (ENOENT); 2297 2298 bridge_rtnode_destroy(sc, brt); 2299 return (0); 2300 } 2301 2302 /* 2303 * bridge_rtdelete: 2304 * 2305 * Delete routes to a speicifc member interface. 2306 */ 2307 void 2308 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2309 { 2310 struct bridge_rtnode *brt, *nbrt; 2311 2312 BRIDGE_LOCK_ASSERT(sc); 2313 2314 for (brt = LIST_FIRST(&sc->sc_rtlist); brt != NULL; brt = nbrt) { 2315 nbrt = LIST_NEXT(brt, brt_list); 2316 if (brt->brt_ifp == ifp && (full || 2317 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2318 bridge_rtnode_destroy(sc, brt); 2319 } 2320 } 2321 2322 /* 2323 * bridge_rtable_init: 2324 * 2325 * Initialize the route table for this bridge. 2326 */ 2327 static int 2328 bridge_rtable_init(struct bridge_softc *sc) 2329 { 2330 int i; 2331 2332 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2333 M_DEVBUF, M_NOWAIT); 2334 if (sc->sc_rthash == NULL) 2335 return (ENOMEM); 2336 2337 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2338 LIST_INIT(&sc->sc_rthash[i]); 2339 2340 sc->sc_rthash_key = arc4random(); 2341 2342 LIST_INIT(&sc->sc_rtlist); 2343 2344 return (0); 2345 } 2346 2347 /* 2348 * bridge_rtable_fini: 2349 * 2350 * Deconstruct the route table for this bridge. 2351 */ 2352 static void 2353 bridge_rtable_fini(struct bridge_softc *sc) 2354 { 2355 2356 free(sc->sc_rthash, M_DEVBUF); 2357 } 2358 2359 /* 2360 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2361 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2362 */ 2363 #define mix(a, b, c) \ 2364 do { \ 2365 a -= b; a -= c; a ^= (c >> 13); \ 2366 b -= c; b -= a; b ^= (a << 8); \ 2367 c -= a; c -= b; c ^= (b >> 13); \ 2368 a -= b; a -= c; a ^= (c >> 12); \ 2369 b -= c; b -= a; b ^= (a << 16); \ 2370 c -= a; c -= b; c ^= (b >> 5); \ 2371 a -= b; a -= c; a ^= (c >> 3); \ 2372 b -= c; b -= a; b ^= (a << 10); \ 2373 c -= a; c -= b; c ^= (b >> 15); \ 2374 } while (/*CONSTCOND*/0) 2375 2376 static __inline uint32_t 2377 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2378 { 2379 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2380 2381 b += addr[5] << 8; 2382 b += addr[4]; 2383 a += addr[3] << 24; 2384 a += addr[2] << 16; 2385 a += addr[1] << 8; 2386 a += addr[0]; 2387 2388 mix(a, b, c); 2389 2390 return (c & BRIDGE_RTHASH_MASK); 2391 } 2392 2393 #undef mix 2394 2395 /* 2396 * bridge_rtnode_lookup: 2397 * 2398 * Look up a bridge route node for the specified destination. 2399 */ 2400 static struct bridge_rtnode * 2401 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2402 { 2403 struct bridge_rtnode *brt; 2404 uint32_t hash; 2405 int dir; 2406 2407 BRIDGE_LOCK_ASSERT(sc); 2408 2409 hash = bridge_rthash(sc, addr); 2410 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2411 dir = memcmp(addr, brt->brt_addr, ETHER_ADDR_LEN); 2412 if (dir == 0) 2413 return (brt); 2414 if (dir > 0) 2415 return (NULL); 2416 } 2417 2418 return (NULL); 2419 } 2420 2421 /* 2422 * bridge_rtnode_insert: 2423 * 2424 * Insert the specified bridge node into the route table. We 2425 * assume the entry is not already in the table. 2426 */ 2427 static int 2428 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2429 { 2430 struct bridge_rtnode *lbrt; 2431 uint32_t hash; 2432 int dir; 2433 2434 BRIDGE_LOCK_ASSERT(sc); 2435 2436 hash = bridge_rthash(sc, brt->brt_addr); 2437 2438 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2439 if (lbrt == NULL) { 2440 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2441 goto out; 2442 } 2443 2444 do { 2445 dir = memcmp(brt->brt_addr, lbrt->brt_addr, ETHER_ADDR_LEN); 2446 if (dir == 0) 2447 return (EEXIST); 2448 if (dir > 0) { 2449 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2450 goto out; 2451 } 2452 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2453 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2454 goto out; 2455 } 2456 lbrt = LIST_NEXT(lbrt, brt_hash); 2457 } while (lbrt != NULL); 2458 2459 #ifdef DIAGNOSTIC 2460 panic("bridge_rtnode_insert: impossible"); 2461 #endif 2462 2463 out: 2464 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2465 sc->sc_brtcnt++; 2466 2467 return (0); 2468 } 2469 2470 /* 2471 * bridge_rtnode_destroy: 2472 * 2473 * Destroy a bridge rtnode. 2474 */ 2475 static void 2476 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2477 { 2478 BRIDGE_LOCK_ASSERT(sc); 2479 2480 LIST_REMOVE(brt, brt_hash); 2481 2482 LIST_REMOVE(brt, brt_list); 2483 sc->sc_brtcnt--; 2484 uma_zfree(bridge_rtnode_zone, brt); 2485 } 2486 2487 /* 2488 * Send bridge packets through pfil if they are one of the types pfil can deal 2489 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 2490 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 2491 * that interface. 2492 */ 2493 static int 2494 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 2495 { 2496 int snap, error, i; 2497 struct ether_header *eh1, eh2; 2498 struct ip_fw_args args; 2499 struct ip *ip; 2500 struct llc llc1; 2501 u_int16_t ether_type; 2502 2503 snap = 0; 2504 error = -1; /* Default error if not error == 0 */ 2505 2506 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) 2507 return 0; /* filtering is disabled */ 2508 2509 i = min((*mp)->m_pkthdr.len, max_protohdr); 2510 if ((*mp)->m_len < i) { 2511 *mp = m_pullup(*mp, i); 2512 if (*mp == NULL) { 2513 printf("%s: m_pullup failed\n", __func__); 2514 return -1; 2515 } 2516 } 2517 2518 eh1 = mtod(*mp, struct ether_header *); 2519 ether_type = ntohs(eh1->ether_type); 2520 2521 /* 2522 * Check for SNAP/LLC. 2523 */ 2524 if (ether_type < ETHERMTU) { 2525 struct llc *llc2 = (struct llc *)(eh1 + 1); 2526 2527 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2528 llc2->llc_dsap == LLC_SNAP_LSAP && 2529 llc2->llc_ssap == LLC_SNAP_LSAP && 2530 llc2->llc_control == LLC_UI) { 2531 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2532 snap = 1; 2533 } 2534 } 2535 2536 /* 2537 * If we're trying to filter bridge traffic, don't look at anything 2538 * other than IP and ARP traffic. If the filter doesn't understand 2539 * IPv6, don't allow IPv6 through the bridge either. This is lame 2540 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2541 * but of course we don't have an AppleTalk filter to begin with. 2542 * (Note that since pfil doesn't understand ARP it will pass *ALL* 2543 * ARP traffic.) 2544 */ 2545 switch (ether_type) { 2546 case ETHERTYPE_ARP: 2547 case ETHERTYPE_REVARP: 2548 return 0; /* Automatically pass */ 2549 case ETHERTYPE_IP: 2550 # ifdef INET6 2551 case ETHERTYPE_IPV6: 2552 # endif /* INET6 */ 2553 break; 2554 default: 2555 /* 2556 * Check to see if the user wants to pass non-ip 2557 * packets, these will not be checked by pfil(9) and 2558 * passed unconditionally so the default is to drop. 2559 */ 2560 if (pfil_onlyip) 2561 goto bad; 2562 } 2563 2564 /* Strip off the Ethernet header and keep a copy. */ 2565 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 2566 m_adj(*mp, ETHER_HDR_LEN); 2567 2568 /* Strip off snap header, if present */ 2569 if (snap) { 2570 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 2571 m_adj(*mp, sizeof(struct llc)); 2572 } 2573 2574 /* 2575 * Check the IP header for alignment and errors 2576 */ 2577 if (dir == PFIL_IN) { 2578 switch (ether_type) { 2579 case ETHERTYPE_IP: 2580 error = bridge_ip_checkbasic(mp); 2581 break; 2582 # ifdef INET6 2583 case ETHERTYPE_IPV6: 2584 error = bridge_ip6_checkbasic(mp); 2585 break; 2586 # endif /* INET6 */ 2587 default: 2588 error = 0; 2589 } 2590 if (error) 2591 goto bad; 2592 } 2593 2594 if (IPFW_LOADED && pfil_ipfw != 0 && dir == PFIL_OUT && ifp != NULL) { 2595 error = -1; 2596 args.rule = ip_dn_claim_rule(*mp); 2597 if (args.rule != NULL && fw_one_pass) 2598 goto ipfwpass; /* packet already partially processed */ 2599 2600 args.m = *mp; 2601 args.oif = ifp; 2602 args.next_hop = NULL; 2603 args.eh = &eh2; 2604 i = ip_fw_chk_ptr(&args); 2605 *mp = args.m; 2606 2607 if (*mp == NULL) 2608 return error; 2609 2610 if (DUMMYNET_LOADED && (i == IP_FW_DUMMYNET)) { 2611 2612 /* put the Ethernet header back on */ 2613 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2614 if (*mp == NULL) 2615 return error; 2616 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 2617 2618 /* 2619 * Pass the pkt to dummynet, which consumes it. The 2620 * packet will return to us via bridge_dummynet(). 2621 */ 2622 args.oif = ifp; 2623 ip_dn_io_ptr(*mp, DN_TO_IFB_FWD, &args); 2624 return error; 2625 } 2626 2627 if (i != IP_FW_PASS) /* drop */ 2628 goto bad; 2629 } 2630 2631 ipfwpass: 2632 error = 0; 2633 2634 /* 2635 * Run the packet through pfil 2636 */ 2637 switch (ether_type) 2638 { 2639 case ETHERTYPE_IP : 2640 /* 2641 * before calling the firewall, swap fields the same as 2642 * IP does. here we assume the header is contiguous 2643 */ 2644 ip = mtod(*mp, struct ip *); 2645 2646 ip->ip_len = ntohs(ip->ip_len); 2647 ip->ip_off = ntohs(ip->ip_off); 2648 2649 /* 2650 * Run pfil on the member interface and the bridge, both can 2651 * be skipped by clearing pfil_member or pfil_bridge. 2652 * 2653 * Keep the order: 2654 * in_if -> bridge_if -> out_if 2655 */ 2656 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 2657 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, 2658 dir, NULL); 2659 2660 if (*mp == NULL || error != 0) /* filter may consume */ 2661 break; 2662 2663 if (pfil_member && ifp != NULL) 2664 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, 2665 dir, NULL); 2666 2667 if (*mp == NULL || error != 0) /* filter may consume */ 2668 break; 2669 2670 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 2671 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, 2672 dir, NULL); 2673 2674 /* Restore ip and the fields ntohs()'d. */ 2675 if (*mp != NULL && error == 0) { 2676 ip = mtod(*mp, struct ip *); 2677 ip->ip_len = htons(ip->ip_len); 2678 ip->ip_off = htons(ip->ip_off); 2679 } 2680 2681 break; 2682 # ifdef INET6 2683 case ETHERTYPE_IPV6 : 2684 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 2685 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, 2686 dir, NULL); 2687 2688 if (*mp == NULL || error != 0) /* filter may consume */ 2689 break; 2690 2691 if (pfil_member && ifp != NULL) 2692 error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp, 2693 dir, NULL); 2694 2695 if (*mp == NULL || error != 0) /* filter may consume */ 2696 break; 2697 2698 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 2699 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, 2700 dir, NULL); 2701 break; 2702 # endif 2703 default : 2704 error = 0; 2705 break; 2706 } 2707 2708 if (*mp == NULL) 2709 return error; 2710 if (error != 0) 2711 goto bad; 2712 2713 error = -1; 2714 2715 /* 2716 * Finally, put everything back the way it was and return 2717 */ 2718 if (snap) { 2719 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 2720 if (*mp == NULL) 2721 return error; 2722 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 2723 } 2724 2725 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2726 if (*mp == NULL) 2727 return error; 2728 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 2729 2730 return 0; 2731 2732 bad: 2733 m_freem(*mp); 2734 *mp = NULL; 2735 return error; 2736 } 2737 2738 /* 2739 * Perform basic checks on header size since 2740 * pfil assumes ip_input has already processed 2741 * it for it. Cut-and-pasted from ip_input.c. 2742 * Given how simple the IPv6 version is, 2743 * does the IPv4 version really need to be 2744 * this complicated? 2745 * 2746 * XXX Should we update ipstat here, or not? 2747 * XXX Right now we update ipstat but not 2748 * XXX csum_counter. 2749 */ 2750 static int 2751 bridge_ip_checkbasic(struct mbuf **mp) 2752 { 2753 struct mbuf *m = *mp; 2754 struct ip *ip; 2755 int len, hlen; 2756 u_short sum; 2757 2758 if (*mp == NULL) 2759 return -1; 2760 2761 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 2762 if ((m = m_copyup(m, sizeof(struct ip), 2763 (max_linkhdr + 3) & ~3)) == NULL) { 2764 /* XXXJRT new stat, please */ 2765 ipstat.ips_toosmall++; 2766 goto bad; 2767 } 2768 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 2769 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 2770 ipstat.ips_toosmall++; 2771 goto bad; 2772 } 2773 } 2774 ip = mtod(m, struct ip *); 2775 if (ip == NULL) goto bad; 2776 2777 if (ip->ip_v != IPVERSION) { 2778 ipstat.ips_badvers++; 2779 goto bad; 2780 } 2781 hlen = ip->ip_hl << 2; 2782 if (hlen < sizeof(struct ip)) { /* minimum header length */ 2783 ipstat.ips_badhlen++; 2784 goto bad; 2785 } 2786 if (hlen > m->m_len) { 2787 if ((m = m_pullup(m, hlen)) == 0) { 2788 ipstat.ips_badhlen++; 2789 goto bad; 2790 } 2791 ip = mtod(m, struct ip *); 2792 if (ip == NULL) goto bad; 2793 } 2794 2795 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 2796 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 2797 } else { 2798 if (hlen == sizeof(struct ip)) { 2799 sum = in_cksum_hdr(ip); 2800 } else { 2801 sum = in_cksum(m, hlen); 2802 } 2803 } 2804 if (sum) { 2805 ipstat.ips_badsum++; 2806 goto bad; 2807 } 2808 2809 /* Retrieve the packet length. */ 2810 len = ntohs(ip->ip_len); 2811 2812 /* 2813 * Check for additional length bogosity 2814 */ 2815 if (len < hlen) { 2816 ipstat.ips_badlen++; 2817 goto bad; 2818 } 2819 2820 /* 2821 * Check that the amount of data in the buffers 2822 * is as at least much as the IP header would have us expect. 2823 * Drop packet if shorter than we expect. 2824 */ 2825 if (m->m_pkthdr.len < len) { 2826 ipstat.ips_tooshort++; 2827 goto bad; 2828 } 2829 2830 /* Checks out, proceed */ 2831 *mp = m; 2832 return 0; 2833 2834 bad: 2835 *mp = m; 2836 return -1; 2837 } 2838 2839 # ifdef INET6 2840 /* 2841 * Same as above, but for IPv6. 2842 * Cut-and-pasted from ip6_input.c. 2843 * XXX Should we update ip6stat, or not? 2844 */ 2845 static int 2846 bridge_ip6_checkbasic(struct mbuf **mp) 2847 { 2848 struct mbuf *m = *mp; 2849 struct ip6_hdr *ip6; 2850 2851 /* 2852 * If the IPv6 header is not aligned, slurp it up into a new 2853 * mbuf with space for link headers, in the event we forward 2854 * it. Otherwise, if it is aligned, make sure the entire base 2855 * IPv6 header is in the first mbuf of the chain. 2856 */ 2857 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 2858 struct ifnet *inifp = m->m_pkthdr.rcvif; 2859 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 2860 (max_linkhdr + 3) & ~3)) == NULL) { 2861 /* XXXJRT new stat, please */ 2862 ip6stat.ip6s_toosmall++; 2863 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2864 goto bad; 2865 } 2866 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 2867 struct ifnet *inifp = m->m_pkthdr.rcvif; 2868 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 2869 ip6stat.ip6s_toosmall++; 2870 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 2871 goto bad; 2872 } 2873 } 2874 2875 ip6 = mtod(m, struct ip6_hdr *); 2876 2877 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 2878 ip6stat.ip6s_badvers++; 2879 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 2880 goto bad; 2881 } 2882 2883 /* Checks out, proceed */ 2884 *mp = m; 2885 return 0; 2886 2887 bad: 2888 *mp = m; 2889 return -1; 2890 } 2891 # endif /* INET6 */ 2892