Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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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: releng/6.3/sys/net/if_bridge.c 174828 2007-12-21 05:30:47Z thompsa $"); 84 85 #include "opt_inet.h" 86 #include "opt_inet6.h" 87 #include "opt_carp.h" 88 89 #include <sys/param.h> 90 #include <sys/mbuf.h> 91 #include <sys/malloc.h> 92 #include <sys/protosw.h> 93 #include <sys/systm.h> 94 #include <sys/time.h> 95 #include <sys/socket.h> /* for net/if.h */ 96 #include <sys/sockio.h> 97 #include <sys/ctype.h> /* string functions */ 98 #include <sys/kernel.h> 99 #include <sys/random.h> 100 #include <sys/syslog.h> 101 #include <sys/sysctl.h> 102 #include <vm/uma.h> 103 #include <sys/module.h> 104 #include <sys/proc.h> 105 #include <sys/lock.h> 106 #include <sys/mutex.h> 107 108 #include <net/bpf.h> 109 #include <net/if.h> 110 #include <net/if_clone.h> 111 #include <net/if_dl.h> 112 #include <net/if_types.h> 113 #include <net/if_var.h> 114 #include <net/pfil.h> 115 116 #include <netinet/in.h> /* for struct arpcom */ 117 #include <netinet/in_systm.h> 118 #include <netinet/in_var.h> 119 #include <netinet/ip.h> 120 #include <netinet/ip_var.h> 121 #ifdef INET6 122 #include <netinet/ip6.h> 123 #include <netinet6/ip6_var.h> 124 #endif 125 #ifdef DEV_CARP 126 #include <netinet/ip_carp.h> 127 #endif 128 #include <machine/in_cksum.h> 129 #include <netinet/if_ether.h> /* for struct arpcom */ 130 #include <net/bridgestp.h> 131 #include <net/if_bridgevar.h> 132 #include <net/if_llc.h> 133 134 #include <net/route.h> 135 #include <netinet/ip_fw.h> 136 #include <netinet/ip_dummynet.h> 137 138 /* 139 * Size of the route hash table. Must be a power of two. 140 */ 141 #ifndef BRIDGE_RTHASH_SIZE 142 #define BRIDGE_RTHASH_SIZE 1024 143 #endif 144 145 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 146 147 /* 148 * Maximum number of addresses to cache. 149 */ 150 #ifndef BRIDGE_RTABLE_MAX 151 #define BRIDGE_RTABLE_MAX 100 152 #endif 153 154 /* 155 * Timeout (in seconds) for entries learned dynamically. 156 */ 157 #ifndef BRIDGE_RTABLE_TIMEOUT 158 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 159 #endif 160 161 /* 162 * Number of seconds between walks of the route list. 163 */ 164 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 165 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 166 #endif 167 168 /* 169 * List of capabilities to mask on the member interface. 170 */ 171 #define BRIDGE_IFCAPS_MASK IFCAP_TXCSUM 172 173 /* 174 * Bridge interface list entry. 175 */ 176 struct bridge_iflist { 177 LIST_ENTRY(bridge_iflist) bif_next; 178 struct ifnet *bif_ifp; /* member if */ 179 struct bstp_port bif_stp; /* STP state */ 180 uint32_t bif_flags; /* member if flags */ 181 int bif_mutecap; /* member muted caps */ 182 }; 183 184 /* 185 * Bridge route node. 186 */ 187 struct bridge_rtnode { 188 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 189 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 190 struct ifnet *brt_ifp; /* destination if */ 191 unsigned long brt_expire; /* expiration time */ 192 uint8_t brt_flags; /* address flags */ 193 uint8_t brt_addr[ETHER_ADDR_LEN]; 194 }; 195 196 /* 197 * Software state for each bridge. 198 */ 199 struct bridge_softc { 200 struct ifnet *sc_ifp; /* make this an interface */ 201 LIST_ENTRY(bridge_softc) sc_list; 202 struct mtx sc_mtx; 203 struct cv sc_cv; 204 uint32_t sc_brtmax; /* max # of addresses */ 205 uint32_t sc_brtcnt; /* cur. # of addresses */ 206 uint32_t sc_brttimeout; /* rt timeout in seconds */ 207 struct callout sc_brcallout; /* bridge callout */ 208 uint32_t sc_iflist_ref; /* refcount for sc_iflist */ 209 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ 210 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 211 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 212 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 213 uint32_t sc_rthash_key; /* key for hash */ 214 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 215 struct bstp_state sc_stp; /* STP state */ 216 uint32_t sc_brtexceeded; /* # of cache drops */ 217 }; 218 219 static struct mtx bridge_list_mtx; 220 eventhandler_tag bridge_detach_cookie = NULL; 221 222 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 223 224 uma_zone_t bridge_rtnode_zone; 225 226 static int bridge_clone_create(struct if_clone *, int); 227 static void bridge_clone_destroy(struct ifnet *); 228 229 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 230 static void bridge_mutecaps(struct bridge_iflist *, int); 231 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 232 static void bridge_init(void *); 233 static void bridge_dummynet(struct mbuf *, struct ifnet *); 234 static void bridge_stop(struct ifnet *, int); 235 static void bridge_start(struct ifnet *); 236 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 237 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 238 struct rtentry *); 239 static void bridge_enqueue(struct bridge_softc *, struct ifnet *, 240 struct mbuf *); 241 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 242 243 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 244 struct mbuf *m); 245 246 static void bridge_timer(void *); 247 248 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 249 struct mbuf *, int); 250 static void bridge_span(struct bridge_softc *, struct mbuf *); 251 252 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 253 struct bridge_iflist *, int, uint8_t); 254 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *); 255 static void bridge_rttrim(struct bridge_softc *); 256 static void bridge_rtage(struct bridge_softc *); 257 static void bridge_rtflush(struct bridge_softc *, int); 258 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *); 259 260 static int bridge_rtable_init(struct bridge_softc *); 261 static void bridge_rtable_fini(struct bridge_softc *); 262 263 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 264 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 265 const uint8_t *); 266 static int bridge_rtnode_insert(struct bridge_softc *, 267 struct bridge_rtnode *); 268 static void bridge_rtnode_destroy(struct bridge_softc *, 269 struct bridge_rtnode *); 270 static void bridge_rtable_expire(struct ifnet *, int); 271 static void bridge_state_change(struct ifnet *, int); 272 273 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 274 const char *name); 275 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 276 struct ifnet *ifp); 277 static void bridge_delete_member(struct bridge_softc *, 278 struct bridge_iflist *, int); 279 static void bridge_delete_span(struct bridge_softc *, 280 struct bridge_iflist *); 281 282 static int bridge_ioctl_add(struct bridge_softc *, void *); 283 static int bridge_ioctl_del(struct bridge_softc *, void *); 284 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 285 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 286 static int bridge_ioctl_scache(struct bridge_softc *, void *); 287 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 288 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 289 static int bridge_ioctl_rts(struct bridge_softc *, void *); 290 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 291 static int bridge_ioctl_sto(struct bridge_softc *, void *); 292 static int bridge_ioctl_gto(struct bridge_softc *, void *); 293 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 294 static int bridge_ioctl_flush(struct bridge_softc *, void *); 295 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 296 static int bridge_ioctl_spri(struct bridge_softc *, void *); 297 static int bridge_ioctl_ght(struct bridge_softc *, void *); 298 static int bridge_ioctl_sht(struct bridge_softc *, void *); 299 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 300 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 301 static int bridge_ioctl_gma(struct bridge_softc *, void *); 302 static int bridge_ioctl_sma(struct bridge_softc *, void *); 303 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 304 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 305 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 306 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 307 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 308 static int bridge_ioctl_grte(struct bridge_softc *, void *); 309 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 310 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 311 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 312 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 313 int); 314 static int bridge_ip_checkbasic(struct mbuf **mp); 315 #ifdef INET6 316 static int bridge_ip6_checkbasic(struct mbuf **mp); 317 #endif /* INET6 */ 318 static int bridge_fragment(struct ifnet *, struct mbuf *, 319 struct ether_header *, int, struct llc *); 320 321 static struct bstp_cb_ops bridge_ops = { 322 .bcb_state = bridge_state_change, 323 .bcb_rtage = bridge_rtable_expire 324 }; 325 326 SYSCTL_DECL(_net_link); 327 SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 328 329 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */ 330 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */ 331 static int pfil_member = 1; /* run pfil hooks on the member interface */ 332 static int pfil_ipfw = 0; /* layer2 filter with ipfw */ 333 static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */ 334 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for 335 locally destined packets */ 336 static int log_stp = 0; /* log STP state changes */ 337 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW, 338 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled"); 339 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW, 340 &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2"); 341 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW, 342 &pfil_bridge, 0, "Packet filter on the bridge interface"); 343 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW, 344 &pfil_member, 0, "Packet filter on the member interface"); 345 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW, 346 &pfil_local_phys, 0, 347 "Packet filter on the physical interface for locally destined packets"); 348 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW, 349 &log_stp, 0, "Log STP state changes"); 350 351 struct bridge_control { 352 int (*bc_func)(struct bridge_softc *, void *); 353 int bc_argsize; 354 int bc_flags; 355 }; 356 357 #define BC_F_COPYIN 0x01 /* copy arguments in */ 358 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 359 #define BC_F_SUSER 0x04 /* do super-user check */ 360 361 const struct bridge_control bridge_control_table[] = { 362 { bridge_ioctl_add, sizeof(struct ifbreq), 363 BC_F_COPYIN|BC_F_SUSER }, 364 { bridge_ioctl_del, sizeof(struct ifbreq), 365 BC_F_COPYIN|BC_F_SUSER }, 366 367 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 368 BC_F_COPYIN|BC_F_COPYOUT }, 369 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 370 BC_F_COPYIN|BC_F_SUSER }, 371 372 { bridge_ioctl_scache, sizeof(struct ifbrparam), 373 BC_F_COPYIN|BC_F_SUSER }, 374 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 375 BC_F_COPYOUT }, 376 377 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 378 BC_F_COPYIN|BC_F_COPYOUT }, 379 { bridge_ioctl_rts, sizeof(struct ifbaconf), 380 BC_F_COPYIN|BC_F_COPYOUT }, 381 382 { bridge_ioctl_saddr, sizeof(struct ifbareq), 383 BC_F_COPYIN|BC_F_SUSER }, 384 385 { bridge_ioctl_sto, sizeof(struct ifbrparam), 386 BC_F_COPYIN|BC_F_SUSER }, 387 { bridge_ioctl_gto, sizeof(struct ifbrparam), 388 BC_F_COPYOUT }, 389 390 { bridge_ioctl_daddr, sizeof(struct ifbareq), 391 BC_F_COPYIN|BC_F_SUSER }, 392 393 { bridge_ioctl_flush, sizeof(struct ifbreq), 394 BC_F_COPYIN|BC_F_SUSER }, 395 396 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 397 BC_F_COPYOUT }, 398 { bridge_ioctl_spri, sizeof(struct ifbrparam), 399 BC_F_COPYIN|BC_F_SUSER }, 400 401 { bridge_ioctl_ght, sizeof(struct ifbrparam), 402 BC_F_COPYOUT }, 403 { bridge_ioctl_sht, sizeof(struct ifbrparam), 404 BC_F_COPYIN|BC_F_SUSER }, 405 406 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 407 BC_F_COPYOUT }, 408 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 409 BC_F_COPYIN|BC_F_SUSER }, 410 411 { bridge_ioctl_gma, sizeof(struct ifbrparam), 412 BC_F_COPYOUT }, 413 { bridge_ioctl_sma, sizeof(struct ifbrparam), 414 BC_F_COPYIN|BC_F_SUSER }, 415 416 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 417 BC_F_COPYIN|BC_F_SUSER }, 418 419 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 420 BC_F_COPYIN|BC_F_SUSER }, 421 422 { bridge_ioctl_addspan, sizeof(struct ifbreq), 423 BC_F_COPYIN|BC_F_SUSER }, 424 { bridge_ioctl_delspan, sizeof(struct ifbreq), 425 BC_F_COPYIN|BC_F_SUSER }, 426 427 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 428 BC_F_COPYOUT }, 429 430 { bridge_ioctl_grte, sizeof(struct ifbrparam), 431 BC_F_COPYOUT }, 432 433 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 434 BC_F_COPYIN|BC_F_COPYOUT }, 435 436 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 437 BC_F_COPYIN|BC_F_SUSER }, 438 439 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 440 BC_F_COPYIN|BC_F_SUSER }, 441 }; 442 const int bridge_control_table_size = 443 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 444 445 static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] = 446 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 447 448 LIST_HEAD(, bridge_softc) bridge_list; 449 450 IFC_SIMPLE_DECLARE(bridge, 0); 451 452 static int 453 bridge_modevent(module_t mod, int type, void *data) 454 { 455 456 switch (type) { 457 case MOD_LOAD: 458 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF); 459 if_clone_attach(&bridge_cloner); 460 bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 461 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 462 UMA_ALIGN_PTR, 0); 463 LIST_INIT(&bridge_list); 464 bridge_input_p = bridge_input; 465 bridge_output_p = bridge_output; 466 bridge_dn_p = bridge_dummynet; 467 bridge_detach_cookie = EVENTHANDLER_REGISTER( 468 ifnet_departure_event, bridge_ifdetach, NULL, 469 EVENTHANDLER_PRI_ANY); 470 break; 471 case MOD_UNLOAD: 472 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 473 bridge_detach_cookie); 474 if_clone_detach(&bridge_cloner); 475 while (!LIST_EMPTY(&bridge_list)) 476 bridge_clone_destroy(LIST_FIRST(&bridge_list)->sc_ifp); 477 uma_zdestroy(bridge_rtnode_zone); 478 bridge_input_p = NULL; 479 bridge_output_p = NULL; 480 bridge_dn_p = NULL; 481 mtx_destroy(&bridge_list_mtx); 482 break; 483 default: 484 return (EOPNOTSUPP); 485 } 486 return (0); 487 } 488 489 static moduledata_t bridge_mod = { 490 "if_bridge", 491 bridge_modevent, 492 0 493 }; 494 495 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 496 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 497 498 /* 499 * handler for net.link.bridge.pfil_ipfw 500 */ 501 static int 502 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 503 { 504 int enable = pfil_ipfw; 505 int error; 506 507 error = sysctl_handle_int(oidp, &enable, 0, req); 508 enable = (enable) ? 1 : 0; 509 510 if (enable != pfil_ipfw) { 511 pfil_ipfw = enable; 512 513 /* 514 * Disable pfil so that ipfw doesnt run twice, if the user 515 * really wants both then they can re-enable pfil_bridge and/or 516 * pfil_member. Also allow non-ip packets as ipfw can filter by 517 * layer2 type. 518 */ 519 if (pfil_ipfw) { 520 pfil_onlyip = 0; 521 pfil_bridge = 0; 522 pfil_member = 0; 523 } 524 } 525 526 return (error); 527 } 528 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW, 529 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW"); 530 531 /* 532 * bridge_clone_create: 533 * 534 * Create a new bridge instance. 535 */ 536 static int 537 bridge_clone_create(struct if_clone *ifc, int unit) 538 { 539 struct bridge_softc *sc, *sc2; 540 struct ifnet *bifp, *ifp; 541 u_char eaddr[6]; 542 int retry; 543 544 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 545 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 546 if (ifp == NULL) { 547 free(sc, M_DEVBUF); 548 return (ENOSPC); 549 } 550 551 BRIDGE_LOCK_INIT(sc); 552 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 553 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 554 555 /* Initialize our routing table. */ 556 bridge_rtable_init(sc); 557 558 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 559 560 LIST_INIT(&sc->sc_iflist); 561 LIST_INIT(&sc->sc_spanlist); 562 563 ifp->if_softc = sc; 564 if_initname(ifp, ifc->ifc_name, unit); 565 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 566 ifp->if_ioctl = bridge_ioctl; 567 ifp->if_start = bridge_start; 568 ifp->if_init = bridge_init; 569 ifp->if_type = IFT_BRIDGE; 570 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 571 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 572 IFQ_SET_READY(&ifp->if_snd); 573 574 /* 575 * Generate a random ethernet address with a locally administered 576 * address. 577 * 578 * Since we are using random ethernet addresses for the bridge, it is 579 * possible that we might have address collisions, so make sure that 580 * this hardware address isn't already in use on another bridge. 581 */ 582 for (retry = 1; retry != 0;) { 583 arc4rand(eaddr, ETHER_ADDR_LEN, 1); 584 eaddr[0] &= ~1; /* clear multicast bit */ 585 eaddr[0] |= 2; /* set the LAA bit */ 586 retry = 0; 587 mtx_lock(&bridge_list_mtx); 588 LIST_FOREACH(sc2, &bridge_list, sc_list) { 589 bifp = sc2->sc_ifp; 590 if (memcmp(eaddr, IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) 591 retry = 1; 592 } 593 mtx_unlock(&bridge_list_mtx); 594 } 595 596 bstp_attach(&sc->sc_stp, &bridge_ops); 597 ether_ifattach(ifp, eaddr); 598 /* Now undo some of the damage... */ 599 ifp->if_baudrate = 0; 600 ifp->if_type = IFT_BRIDGE; 601 602 mtx_lock(&bridge_list_mtx); 603 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 604 mtx_unlock(&bridge_list_mtx); 605 606 return (0); 607 } 608 609 /* 610 * bridge_clone_destroy: 611 * 612 * Destroy a bridge instance. 613 */ 614 static void 615 bridge_clone_destroy(struct ifnet *ifp) 616 { 617 struct bridge_softc *sc = ifp->if_softc; 618 struct bridge_iflist *bif; 619 620 BRIDGE_LOCK(sc); 621 622 bridge_stop(ifp, 1); 623 ifp->if_flags &= ~IFF_UP; 624 625 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 626 bridge_delete_member(sc, bif, 0); 627 628 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 629 bridge_delete_span(sc, bif); 630 } 631 632 BRIDGE_UNLOCK(sc); 633 634 callout_drain(&sc->sc_brcallout); 635 636 mtx_lock(&bridge_list_mtx); 637 LIST_REMOVE(sc, sc_list); 638 mtx_unlock(&bridge_list_mtx); 639 640 bstp_detach(&sc->sc_stp); 641 ether_ifdetach(ifp); 642 if_free_type(ifp, IFT_ETHER); 643 644 /* Tear down the routing table. */ 645 bridge_rtable_fini(sc); 646 647 BRIDGE_LOCK_DESTROY(sc); 648 free(sc, M_DEVBUF); 649 } 650 651 /* 652 * bridge_ioctl: 653 * 654 * Handle a control request from the operator. 655 */ 656 static int 657 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 658 { 659 struct bridge_softc *sc = ifp->if_softc; 660 struct thread *td = curthread; 661 union { 662 struct ifbreq ifbreq; 663 struct ifbifconf ifbifconf; 664 struct ifbareq ifbareq; 665 struct ifbaconf ifbaconf; 666 struct ifbrparam ifbrparam; 667 struct ifbropreq ifbropreq; 668 } args; 669 struct ifdrv *ifd = (struct ifdrv *) data; 670 const struct bridge_control *bc; 671 int error = 0; 672 673 switch (cmd) { 674 675 case SIOCADDMULTI: 676 case SIOCDELMULTI: 677 break; 678 679 case SIOCGDRVSPEC: 680 case SIOCSDRVSPEC: 681 if (ifd->ifd_cmd >= bridge_control_table_size) { 682 error = EINVAL; 683 break; 684 } 685 bc = &bridge_control_table[ifd->ifd_cmd]; 686 687 if (cmd == SIOCGDRVSPEC && 688 (bc->bc_flags & BC_F_COPYOUT) == 0) { 689 error = EINVAL; 690 break; 691 } 692 else if (cmd == SIOCSDRVSPEC && 693 (bc->bc_flags & BC_F_COPYOUT) != 0) { 694 error = EINVAL; 695 break; 696 } 697 698 if (bc->bc_flags & BC_F_SUSER) { 699 error = suser(td); 700 if (error) 701 break; 702 } 703 704 if (ifd->ifd_len != bc->bc_argsize || 705 ifd->ifd_len > sizeof(args)) { 706 error = EINVAL; 707 break; 708 } 709 710 bzero(&args, sizeof(args)); 711 if (bc->bc_flags & BC_F_COPYIN) { 712 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 713 if (error) 714 break; 715 } 716 717 BRIDGE_LOCK(sc); 718 error = (*bc->bc_func)(sc, &args); 719 BRIDGE_UNLOCK(sc); 720 if (error) 721 break; 722 723 if (bc->bc_flags & BC_F_COPYOUT) 724 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 725 726 break; 727 728 case SIOCSIFFLAGS: 729 if (!(ifp->if_flags & IFF_UP) && 730 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 731 /* 732 * If interface is marked down and it is running, 733 * then stop and disable it. 734 */ 735 BRIDGE_LOCK(sc); 736 bridge_stop(ifp, 1); 737 BRIDGE_UNLOCK(sc); 738 } else if ((ifp->if_flags & IFF_UP) && 739 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 740 /* 741 * If interface is marked up and it is stopped, then 742 * start it. 743 */ 744 (*ifp->if_init)(sc); 745 } 746 break; 747 748 case SIOCSIFMTU: 749 /* Do not allow the MTU to be changed on the bridge */ 750 error = EINVAL; 751 break; 752 753 default: 754 /* 755 * drop the lock as ether_ioctl() will call bridge_start() and 756 * cause the lock to be recursed. 757 */ 758 error = ether_ioctl(ifp, cmd, data); 759 break; 760 } 761 762 return (error); 763 } 764 765 /* 766 * bridge_mutecaps: 767 * 768 * Clear or restore unwanted capabilities on the member interface 769 */ 770 static void 771 bridge_mutecaps(struct bridge_iflist *bif, int mute) 772 { 773 struct ifnet *ifp = bif->bif_ifp; 774 struct ifreq ifr; 775 int error; 776 777 if (ifp->if_ioctl == NULL) 778 return; 779 780 bzero(&ifr, sizeof(ifr)); 781 ifr.ifr_reqcap = ifp->if_capenable; 782 783 if (mute) { 784 /* mask off and save capabilities */ 785 bif->bif_mutecap = ifr.ifr_reqcap & BRIDGE_IFCAPS_MASK; 786 if (bif->bif_mutecap != 0) 787 ifr.ifr_reqcap &= ~BRIDGE_IFCAPS_MASK; 788 } else 789 /* restore muted capabilities */ 790 ifr.ifr_reqcap |= bif->bif_mutecap; 791 792 793 if (bif->bif_mutecap != 0) { 794 IFF_LOCKGIANT(ifp); 795 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 796 IFF_UNLOCKGIANT(ifp); 797 } 798 } 799 800 /* 801 * bridge_lookup_member: 802 * 803 * Lookup a bridge member interface. 804 */ 805 static struct bridge_iflist * 806 bridge_lookup_member(struct bridge_softc *sc, const char *name) 807 { 808 struct bridge_iflist *bif; 809 struct ifnet *ifp; 810 811 BRIDGE_LOCK_ASSERT(sc); 812 813 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 814 ifp = bif->bif_ifp; 815 if (strcmp(ifp->if_xname, name) == 0) 816 return (bif); 817 } 818 819 return (NULL); 820 } 821 822 /* 823 * bridge_lookup_member_if: 824 * 825 * Lookup a bridge member interface by ifnet*. 826 */ 827 static struct bridge_iflist * 828 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 829 { 830 struct bridge_iflist *bif; 831 832 BRIDGE_LOCK_ASSERT(sc); 833 834 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 835 if (bif->bif_ifp == member_ifp) 836 return (bif); 837 } 838 839 return (NULL); 840 } 841 842 /* 843 * bridge_delete_member: 844 * 845 * Delete the specified member interface. 846 */ 847 static void 848 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 849 int gone) 850 { 851 struct ifnet *ifs = bif->bif_ifp; 852 853 BRIDGE_LOCK_ASSERT(sc); 854 855 if (!gone) { 856 switch (ifs->if_type) { 857 case IFT_ETHER: 858 case IFT_L2VLAN: 859 /* 860 * Take the interface out of promiscuous mode. 861 */ 862 (void) ifpromisc(ifs, 0); 863 bridge_mutecaps(bif, 0); 864 break; 865 866 case IFT_GIF: 867 break; 868 869 default: 870 #ifdef DIAGNOSTIC 871 panic("bridge_delete_member: impossible"); 872 #endif 873 break; 874 } 875 } 876 877 if (bif->bif_flags & IFBIF_STP) 878 bstp_disable(&bif->bif_stp); 879 880 ifs->if_bridge = NULL; 881 BRIDGE_XLOCK(sc); 882 LIST_REMOVE(bif, bif_next); 883 BRIDGE_XDROP(sc); 884 885 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 886 887 BRIDGE_UNLOCK(sc); 888 bstp_destroy(&bif->bif_stp); /* prepare to free */ 889 BRIDGE_LOCK(sc); 890 free(bif, M_DEVBUF); 891 } 892 893 /* 894 * bridge_delete_span: 895 * 896 * Delete the specified span interface. 897 */ 898 static void 899 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 900 { 901 BRIDGE_LOCK_ASSERT(sc); 902 903 KASSERT(bif->bif_ifp->if_bridge == NULL, 904 ("%s: not a span interface", __func__)); 905 906 LIST_REMOVE(bif, bif_next); 907 free(bif, M_DEVBUF); 908 } 909 910 static int 911 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 912 { 913 struct ifbreq *req = arg; 914 struct bridge_iflist *bif = NULL; 915 struct ifnet *ifs; 916 int error = 0; 917 918 ifs = ifunit(req->ifbr_ifsname); 919 if (ifs == NULL) 920 return (ENOENT); 921 922 /* If it's in the span list, it can't be a member. */ 923 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 924 if (ifs == bif->bif_ifp) 925 return (EBUSY); 926 927 /* Allow the first Ethernet member to define the MTU */ 928 if (ifs->if_type != IFT_GIF) { 929 if (LIST_EMPTY(&sc->sc_iflist)) 930 sc->sc_ifp->if_mtu = ifs->if_mtu; 931 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 932 if_printf(sc->sc_ifp, "invalid MTU for %s\n", 933 ifs->if_xname); 934 return (EINVAL); 935 } 936 } 937 938 if (ifs->if_bridge == sc) 939 return (EEXIST); 940 941 if (ifs->if_bridge != NULL) 942 return (EBUSY); 943 944 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 945 if (bif == NULL) 946 return (ENOMEM); 947 948 bif->bif_ifp = ifs; 949 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 950 951 switch (ifs->if_type) { 952 case IFT_ETHER: 953 case IFT_L2VLAN: 954 /* 955 * Place the interface into promiscuous mode. 956 */ 957 error = ifpromisc(ifs, 1); 958 if (error) 959 goto out; 960 961 bridge_mutecaps(bif, 1); 962 break; 963 964 case IFT_GIF: 965 break; 966 967 default: 968 error = EINVAL; 969 goto out; 970 } 971 972 ifs->if_bridge = sc; 973 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 974 /* 975 * XXX: XLOCK HERE!?! 976 * 977 * NOTE: insert_***HEAD*** should be safe for the traversals. 978 */ 979 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 980 981 out: 982 if (error) { 983 if (bif != NULL) 984 free(bif, M_DEVBUF); 985 } 986 return (error); 987 } 988 989 static int 990 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 991 { 992 struct ifbreq *req = arg; 993 struct bridge_iflist *bif; 994 995 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 996 if (bif == NULL) 997 return (ENOENT); 998 999 bridge_delete_member(sc, bif, 0); 1000 1001 return (0); 1002 } 1003 1004 static int 1005 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1006 { 1007 struct ifbreq *req = arg; 1008 struct bridge_iflist *bif; 1009 struct bstp_port *bp; 1010 1011 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1012 if (bif == NULL) 1013 return (ENOENT); 1014 1015 bp = &bif->bif_stp; 1016 req->ifbr_ifsflags = bif->bif_flags; 1017 req->ifbr_state = bp->bp_state; 1018 req->ifbr_priority = bp->bp_priority; 1019 req->ifbr_path_cost = bp->bp_path_cost; 1020 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1021 req->ifbr_proto = bp->bp_protover; 1022 req->ifbr_role = bp->bp_role; 1023 req->ifbr_stpflags = bp->bp_flags; 1024 1025 /* Copy STP state options as flags */ 1026 if (bp->bp_operedge) 1027 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1028 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1029 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1030 if (bp->bp_ptp_link) 1031 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1032 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1033 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1034 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1035 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1036 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1037 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1038 return (0); 1039 } 1040 1041 static int 1042 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1043 { 1044 struct ifbreq *req = arg; 1045 struct bridge_iflist *bif; 1046 struct bstp_port *bp; 1047 int error; 1048 1049 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1050 if (bif == NULL) 1051 return (ENOENT); 1052 bp = &bif->bif_stp; 1053 1054 if (req->ifbr_ifsflags & IFBIF_SPAN) 1055 /* SPAN is readonly */ 1056 return (EINVAL); 1057 1058 if (req->ifbr_ifsflags & IFBIF_STP) { 1059 if ((bif->bif_flags & IFBIF_STP) == 0) { 1060 error = bstp_enable(&bif->bif_stp); 1061 if (error) 1062 return (error); 1063 } 1064 } else { 1065 if ((bif->bif_flags & IFBIF_STP) != 0) 1066 bstp_disable(&bif->bif_stp); 1067 } 1068 1069 /* Pass on STP flags */ 1070 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1071 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1072 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1073 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1074 1075 /* Save the bits relating to the bridge */ 1076 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1077 1078 return (0); 1079 } 1080 1081 static int 1082 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1083 { 1084 struct ifbrparam *param = arg; 1085 1086 sc->sc_brtmax = param->ifbrp_csize; 1087 bridge_rttrim(sc); 1088 1089 return (0); 1090 } 1091 1092 static int 1093 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1094 { 1095 struct ifbrparam *param = arg; 1096 1097 param->ifbrp_csize = sc->sc_brtmax; 1098 1099 return (0); 1100 } 1101 1102 static int 1103 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1104 { 1105 struct ifbifconf *bifc = arg; 1106 struct bridge_iflist *bif; 1107 struct ifbreq breq; 1108 char *buf, *outbuf; 1109 int count, buflen, len, error = 0; 1110 1111 count = 0; 1112 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1113 count++; 1114 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1115 count++; 1116 1117 buflen = sizeof(breq) * count; 1118 if (bifc->ifbic_len == 0) { 1119 bifc->ifbic_len = buflen; 1120 return (0); 1121 } 1122 BRIDGE_UNLOCK(sc); 1123 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1124 BRIDGE_LOCK(sc); 1125 1126 count = 0; 1127 buf = outbuf; 1128 len = min(bifc->ifbic_len, buflen); 1129 bzero(&breq, sizeof(breq)); 1130 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1131 if (len < sizeof(breq)) 1132 break; 1133 1134 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1135 sizeof(breq.ifbr_ifsname)); 1136 /* Fill in the ifbreq structure */ 1137 error = bridge_ioctl_gifflags(sc, &breq); 1138 if (error) 1139 break; 1140 memcpy(buf, &breq, sizeof(breq)); 1141 count++; 1142 buf += sizeof(breq); 1143 len -= sizeof(breq); 1144 } 1145 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1146 if (len < sizeof(breq)) 1147 break; 1148 1149 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1150 sizeof(breq.ifbr_ifsname)); 1151 breq.ifbr_ifsflags = bif->bif_flags; 1152 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1153 memcpy(buf, &breq, sizeof(breq)); 1154 count++; 1155 buf += sizeof(breq); 1156 len -= sizeof(breq); 1157 } 1158 1159 BRIDGE_UNLOCK(sc); 1160 bifc->ifbic_len = sizeof(breq) * count; 1161 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1162 BRIDGE_LOCK(sc); 1163 free(outbuf, M_TEMP); 1164 return (error); 1165 } 1166 1167 static int 1168 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1169 { 1170 struct ifbaconf *bac = arg; 1171 struct bridge_rtnode *brt; 1172 struct ifbareq bareq; 1173 char *buf, *outbuf; 1174 int count, buflen, len, error = 0; 1175 1176 if (bac->ifbac_len == 0) 1177 return (0); 1178 1179 count = 0; 1180 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1181 count++; 1182 buflen = sizeof(bareq) * count; 1183 1184 BRIDGE_UNLOCK(sc); 1185 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1186 BRIDGE_LOCK(sc); 1187 1188 count = 0; 1189 buf = outbuf; 1190 len = min(bac->ifbac_len, buflen); 1191 bzero(&bareq, sizeof(bareq)); 1192 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1193 if (len < sizeof(bareq)) 1194 goto out; 1195 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1196 sizeof(bareq.ifba_ifsname)); 1197 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1198 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1199 time_uptime < brt->brt_expire) 1200 bareq.ifba_expire = brt->brt_expire - time_uptime; 1201 else 1202 bareq.ifba_expire = 0; 1203 bareq.ifba_flags = brt->brt_flags; 1204 1205 memcpy(buf, &bareq, sizeof(bareq)); 1206 count++; 1207 buf += sizeof(bareq); 1208 len -= sizeof(bareq); 1209 } 1210 out: 1211 BRIDGE_UNLOCK(sc); 1212 bac->ifbac_len = sizeof(bareq) * count; 1213 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1214 BRIDGE_LOCK(sc); 1215 free(outbuf, M_TEMP); 1216 return (error); 1217 } 1218 1219 static int 1220 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1221 { 1222 struct ifbareq *req = arg; 1223 struct bridge_iflist *bif; 1224 int error; 1225 1226 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1227 if (bif == NULL) 1228 return (ENOENT); 1229 1230 error = bridge_rtupdate(sc, req->ifba_dst, bif, 1, 1231 req->ifba_flags); 1232 1233 return (error); 1234 } 1235 1236 static int 1237 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1238 { 1239 struct ifbrparam *param = arg; 1240 1241 sc->sc_brttimeout = param->ifbrp_ctime; 1242 return (0); 1243 } 1244 1245 static int 1246 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1247 { 1248 struct ifbrparam *param = arg; 1249 1250 param->ifbrp_ctime = sc->sc_brttimeout; 1251 return (0); 1252 } 1253 1254 static int 1255 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1256 { 1257 struct ifbareq *req = arg; 1258 1259 return (bridge_rtdaddr(sc, req->ifba_dst)); 1260 } 1261 1262 static int 1263 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1264 { 1265 struct ifbreq *req = arg; 1266 1267 bridge_rtflush(sc, req->ifbr_ifsflags); 1268 return (0); 1269 } 1270 1271 static int 1272 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1273 { 1274 struct ifbrparam *param = arg; 1275 struct bstp_state *bs = &sc->sc_stp; 1276 1277 param->ifbrp_prio = bs->bs_bridge_priority; 1278 return (0); 1279 } 1280 1281 static int 1282 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1283 { 1284 struct ifbrparam *param = arg; 1285 1286 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1287 } 1288 1289 static int 1290 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1291 { 1292 struct ifbrparam *param = arg; 1293 struct bstp_state *bs = &sc->sc_stp; 1294 1295 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1296 return (0); 1297 } 1298 1299 static int 1300 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1301 { 1302 struct ifbrparam *param = arg; 1303 1304 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1305 } 1306 1307 static int 1308 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1309 { 1310 struct ifbrparam *param = arg; 1311 struct bstp_state *bs = &sc->sc_stp; 1312 1313 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1314 return (0); 1315 } 1316 1317 static int 1318 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1319 { 1320 struct ifbrparam *param = arg; 1321 1322 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1323 } 1324 1325 static int 1326 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1327 { 1328 struct ifbrparam *param = arg; 1329 struct bstp_state *bs = &sc->sc_stp; 1330 1331 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1332 return (0); 1333 } 1334 1335 static int 1336 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1337 { 1338 struct ifbrparam *param = arg; 1339 1340 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1341 } 1342 1343 static int 1344 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1345 { 1346 struct ifbreq *req = arg; 1347 struct bridge_iflist *bif; 1348 1349 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1350 if (bif == NULL) 1351 return (ENOENT); 1352 1353 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1354 } 1355 1356 static int 1357 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1358 { 1359 struct ifbreq *req = arg; 1360 struct bridge_iflist *bif; 1361 1362 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1363 if (bif == NULL) 1364 return (ENOENT); 1365 1366 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1367 } 1368 1369 static int 1370 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1371 { 1372 struct ifbreq *req = arg; 1373 struct bridge_iflist *bif = NULL; 1374 struct ifnet *ifs; 1375 1376 ifs = ifunit(req->ifbr_ifsname); 1377 if (ifs == NULL) 1378 return (ENOENT); 1379 1380 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1381 if (ifs == bif->bif_ifp) 1382 return (EBUSY); 1383 1384 if (ifs->if_bridge != NULL) 1385 return (EBUSY); 1386 1387 switch (ifs->if_type) { 1388 case IFT_ETHER: 1389 case IFT_GIF: 1390 case IFT_L2VLAN: 1391 break; 1392 default: 1393 return (EINVAL); 1394 } 1395 1396 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1397 if (bif == NULL) 1398 return (ENOMEM); 1399 1400 bif->bif_ifp = ifs; 1401 bif->bif_flags = IFBIF_SPAN; 1402 1403 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1404 1405 return (0); 1406 } 1407 1408 static int 1409 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1410 { 1411 struct ifbreq *req = arg; 1412 struct bridge_iflist *bif; 1413 struct ifnet *ifs; 1414 1415 ifs = ifunit(req->ifbr_ifsname); 1416 if (ifs == NULL) 1417 return (ENOENT); 1418 1419 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1420 if (ifs == bif->bif_ifp) 1421 break; 1422 1423 if (bif == NULL) 1424 return (ENOENT); 1425 1426 bridge_delete_span(sc, bif); 1427 1428 return (0); 1429 } 1430 1431 static int 1432 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1433 { 1434 struct ifbropreq *req = arg; 1435 struct bstp_state *bs = &sc->sc_stp; 1436 struct bstp_port *root_port; 1437 1438 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1439 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1440 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1441 1442 root_port = bs->bs_root_port; 1443 if (root_port == NULL) 1444 req->ifbop_root_port = 0; 1445 else 1446 req->ifbop_root_port = root_port->bp_ifp->if_index; 1447 1448 req->ifbop_holdcount = bs->bs_txholdcount; 1449 req->ifbop_priority = bs->bs_bridge_priority; 1450 req->ifbop_protocol = bs->bs_protover; 1451 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1452 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1453 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1454 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1455 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1456 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1457 1458 return (0); 1459 } 1460 1461 static int 1462 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1463 { 1464 struct ifbrparam *param = arg; 1465 1466 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1467 return (0); 1468 } 1469 1470 static int 1471 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1472 { 1473 struct ifbpstpconf *bifstp = arg; 1474 struct bridge_iflist *bif; 1475 struct bstp_port *bp; 1476 struct ifbpstpreq bpreq; 1477 char *buf, *outbuf; 1478 int count, buflen, len, error = 0; 1479 1480 count = 0; 1481 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1482 if ((bif->bif_flags & IFBIF_STP) != 0) 1483 count++; 1484 } 1485 1486 buflen = sizeof(bpreq) * count; 1487 if (bifstp->ifbpstp_len == 0) { 1488 bifstp->ifbpstp_len = buflen; 1489 return (0); 1490 } 1491 1492 BRIDGE_UNLOCK(sc); 1493 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1494 BRIDGE_LOCK(sc); 1495 1496 count = 0; 1497 buf = outbuf; 1498 len = min(bifstp->ifbpstp_len, buflen); 1499 bzero(&bpreq, sizeof(bpreq)); 1500 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1501 if (len < sizeof(bpreq)) 1502 break; 1503 1504 if ((bif->bif_flags & IFBIF_STP) == 0) 1505 continue; 1506 1507 bp = &bif->bif_stp; 1508 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1509 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1510 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1511 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1512 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1513 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1514 1515 memcpy(buf, &bpreq, sizeof(bpreq)); 1516 count++; 1517 buf += sizeof(bpreq); 1518 len -= sizeof(bpreq); 1519 } 1520 1521 BRIDGE_UNLOCK(sc); 1522 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1523 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1524 BRIDGE_LOCK(sc); 1525 free(outbuf, M_TEMP); 1526 return (error); 1527 } 1528 1529 static int 1530 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1531 { 1532 struct ifbrparam *param = arg; 1533 1534 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1535 } 1536 1537 static int 1538 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1539 { 1540 struct ifbrparam *param = arg; 1541 1542 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1543 } 1544 1545 /* 1546 * bridge_ifdetach: 1547 * 1548 * Detach an interface from a bridge. Called when a member 1549 * interface is detaching. 1550 */ 1551 static void 1552 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1553 { 1554 struct bridge_softc *sc = ifp->if_bridge; 1555 struct bridge_iflist *bif; 1556 1557 /* Check if the interface is a bridge member */ 1558 if (sc != NULL) { 1559 BRIDGE_LOCK(sc); 1560 1561 bif = bridge_lookup_member_if(sc, ifp); 1562 if (bif != NULL) 1563 bridge_delete_member(sc, bif, 1); 1564 1565 BRIDGE_UNLOCK(sc); 1566 return; 1567 } 1568 1569 /* Check if the interface is a span port */ 1570 mtx_lock(&bridge_list_mtx); 1571 LIST_FOREACH(sc, &bridge_list, sc_list) { 1572 BRIDGE_LOCK(sc); 1573 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1574 if (ifp == bif->bif_ifp) { 1575 bridge_delete_span(sc, bif); 1576 break; 1577 } 1578 1579 BRIDGE_UNLOCK(sc); 1580 } 1581 mtx_unlock(&bridge_list_mtx); 1582 } 1583 1584 /* 1585 * bridge_init: 1586 * 1587 * Initialize a bridge interface. 1588 */ 1589 static void 1590 bridge_init(void *xsc) 1591 { 1592 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1593 struct ifnet *ifp = sc->sc_ifp; 1594 1595 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1596 return; 1597 1598 BRIDGE_LOCK(sc); 1599 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1600 bridge_timer, sc); 1601 1602 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1603 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1604 1605 BRIDGE_UNLOCK(sc); 1606 } 1607 1608 /* 1609 * bridge_stop: 1610 * 1611 * Stop the bridge interface. 1612 */ 1613 static void 1614 bridge_stop(struct ifnet *ifp, int disable) 1615 { 1616 struct bridge_softc *sc = ifp->if_softc; 1617 1618 BRIDGE_LOCK_ASSERT(sc); 1619 1620 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1621 return; 1622 1623 callout_stop(&sc->sc_brcallout); 1624 bstp_stop(&sc->sc_stp); 1625 1626 bridge_rtflush(sc, IFBF_FLUSHDYN); 1627 1628 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1629 } 1630 1631 /* 1632 * bridge_enqueue: 1633 * 1634 * Enqueue a packet on a bridge member interface. 1635 * 1636 */ 1637 static void 1638 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1639 { 1640 int len, err = 0; 1641 short mflags; 1642 struct mbuf *m0; 1643 1644 len = m->m_pkthdr.len; 1645 mflags = m->m_flags; 1646 1647 /* We may be sending a fragment so traverse the mbuf */ 1648 for (; m; m = m0) { 1649 m0 = m->m_nextpkt; 1650 m->m_nextpkt = NULL; 1651 1652 if (err == 0) 1653 IFQ_ENQUEUE(&dst_ifp->if_snd, m, err); 1654 } 1655 1656 if (err == 0) { 1657 1658 sc->sc_ifp->if_opackets++; 1659 sc->sc_ifp->if_obytes += len; 1660 1661 dst_ifp->if_obytes += len; 1662 1663 if (mflags & M_MCAST) { 1664 sc->sc_ifp->if_omcasts++; 1665 dst_ifp->if_omcasts++; 1666 } 1667 } 1668 1669 if ((dst_ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0) 1670 (*dst_ifp->if_start)(dst_ifp); 1671 } 1672 1673 /* 1674 * bridge_dummynet: 1675 * 1676 * Receive a queued packet from dummynet and pass it on to the output 1677 * interface. 1678 * 1679 * The mbuf has the Ethernet header already attached. 1680 */ 1681 static void 1682 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1683 { 1684 struct bridge_softc *sc; 1685 1686 sc = ifp->if_bridge; 1687 1688 /* 1689 * The packet didnt originate from a member interface. This should only 1690 * ever happen if a member interface is removed while packets are 1691 * queued for it. 1692 */ 1693 if (sc == NULL) { 1694 m_freem(m); 1695 return; 1696 } 1697 1698 if (inet_pfil_hook.ph_busy_count >= 0 1699 #ifdef INET6 1700 || inet6_pfil_hook.ph_busy_count >= 0 1701 #endif 1702 ) { 1703 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1704 return; 1705 if (m == NULL) 1706 return; 1707 } 1708 1709 bridge_enqueue(sc, ifp, m); 1710 } 1711 1712 /* 1713 * bridge_output: 1714 * 1715 * Send output from a bridge member interface. This 1716 * performs the bridging function for locally originated 1717 * packets. 1718 * 1719 * The mbuf has the Ethernet header already attached. We must 1720 * enqueue or free the mbuf before returning. 1721 */ 1722 static int 1723 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1724 struct rtentry *rt) 1725 { 1726 struct ether_header *eh; 1727 struct ifnet *dst_if; 1728 struct bridge_softc *sc; 1729 1730 if (m->m_len < ETHER_HDR_LEN) { 1731 m = m_pullup(m, ETHER_HDR_LEN); 1732 if (m == NULL) 1733 return (0); 1734 } 1735 1736 eh = mtod(m, struct ether_header *); 1737 sc = ifp->if_bridge; 1738 1739 BRIDGE_LOCK(sc); 1740 1741 /* 1742 * If bridge is down, but the original output interface is up, 1743 * go ahead and send out that interface. Otherwise, the packet 1744 * is dropped below. 1745 */ 1746 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1747 dst_if = ifp; 1748 goto sendunicast; 1749 } 1750 1751 /* 1752 * If the packet is a multicast, or we don't know a better way to 1753 * get there, send to all interfaces. 1754 */ 1755 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1756 dst_if = NULL; 1757 else 1758 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1759 if (dst_if == NULL) { 1760 struct bridge_iflist *bif; 1761 struct mbuf *mc; 1762 int error = 0, used = 0; 1763 1764 bridge_span(sc, m); 1765 1766 BRIDGE_LOCK2REF(sc, error); 1767 if (error) { 1768 m_freem(m); 1769 return (0); 1770 } 1771 1772 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1773 dst_if = bif->bif_ifp; 1774 1775 if (dst_if->if_type == IFT_GIF) 1776 continue; 1777 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 1778 continue; 1779 1780 /* 1781 * If this is not the original output interface, 1782 * and the interface is participating in spanning 1783 * tree, make sure the port is in a state that 1784 * allows forwarding. 1785 */ 1786 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 1787 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 1788 continue; 1789 1790 if (LIST_NEXT(bif, bif_next) == NULL) { 1791 used = 1; 1792 mc = m; 1793 } else { 1794 mc = m_copypacket(m, M_DONTWAIT); 1795 if (mc == NULL) { 1796 sc->sc_ifp->if_oerrors++; 1797 continue; 1798 } 1799 } 1800 1801 bridge_enqueue(sc, dst_if, mc); 1802 } 1803 if (used == 0) 1804 m_freem(m); 1805 BRIDGE_UNREF(sc); 1806 return (0); 1807 } 1808 1809 sendunicast: 1810 /* 1811 * XXX Spanning tree consideration here? 1812 */ 1813 1814 bridge_span(sc, m); 1815 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1816 m_freem(m); 1817 BRIDGE_UNLOCK(sc); 1818 return (0); 1819 } 1820 1821 BRIDGE_UNLOCK(sc); 1822 bridge_enqueue(sc, dst_if, m); 1823 return (0); 1824 } 1825 1826 /* 1827 * bridge_start: 1828 * 1829 * Start output on a bridge. 1830 * 1831 */ 1832 static void 1833 bridge_start(struct ifnet *ifp) 1834 { 1835 struct bridge_softc *sc; 1836 struct mbuf *m; 1837 struct ether_header *eh; 1838 struct ifnet *dst_if; 1839 1840 sc = ifp->if_softc; 1841 1842 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 1843 for (;;) { 1844 IFQ_DEQUEUE(&ifp->if_snd, m); 1845 if (m == 0) 1846 break; 1847 BPF_MTAP(ifp, m); 1848 1849 eh = mtod(m, struct ether_header *); 1850 dst_if = NULL; 1851 1852 BRIDGE_LOCK(sc); 1853 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1854 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1855 } 1856 1857 if (dst_if == NULL) 1858 bridge_broadcast(sc, ifp, m, 0); 1859 else { 1860 BRIDGE_UNLOCK(sc); 1861 bridge_enqueue(sc, dst_if, m); 1862 } 1863 } 1864 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1865 } 1866 1867 /* 1868 * bridge_forward: 1869 * 1870 * The forwarding function of the bridge. 1871 * 1872 * NOTE: Releases the lock on return. 1873 */ 1874 static void 1875 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 1876 struct mbuf *m) 1877 { 1878 struct bridge_iflist *dbif; 1879 struct ifnet *src_if, *dst_if, *ifp; 1880 struct ether_header *eh; 1881 1882 src_if = m->m_pkthdr.rcvif; 1883 ifp = sc->sc_ifp; 1884 1885 sc->sc_ifp->if_ipackets++; 1886 sc->sc_ifp->if_ibytes += m->m_pkthdr.len; 1887 1888 if ((sbif->bif_flags & IFBIF_STP) && 1889 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 1890 BRIDGE_UNLOCK(sc); 1891 m_freem(m); 1892 return; 1893 } 1894 1895 eh = mtod(m, struct ether_header *); 1896 1897 /* 1898 * If the interface is learning, and the source 1899 * address is valid and not multicast, record 1900 * the address. 1901 */ 1902 if ((sbif->bif_flags & IFBIF_LEARNING) != 0 && 1903 ETHER_IS_MULTICAST(eh->ether_shost) == 0 && 1904 (eh->ether_shost[0] == 0 && 1905 eh->ether_shost[1] == 0 && 1906 eh->ether_shost[2] == 0 && 1907 eh->ether_shost[3] == 0 && 1908 eh->ether_shost[4] == 0 && 1909 eh->ether_shost[5] == 0) == 0) { 1910 (void) bridge_rtupdate(sc, eh->ether_shost, 1911 sbif, 0, IFBAF_DYNAMIC); 1912 } 1913 1914 if ((sbif->bif_flags & IFBIF_STP) != 0 && 1915 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) { 1916 m_freem(m); 1917 BRIDGE_UNLOCK(sc); 1918 return; 1919 } 1920 1921 /* 1922 * At this point, the port either doesn't participate 1923 * in spanning tree or it is in the forwarding state. 1924 */ 1925 1926 /* 1927 * If the packet is unicast, destined for someone on 1928 * "this" side of the bridge, drop it. 1929 */ 1930 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1931 dst_if = bridge_rtlookup(sc, eh->ether_dhost); 1932 if (src_if == dst_if) { 1933 BRIDGE_UNLOCK(sc); 1934 m_freem(m); 1935 return; 1936 } 1937 } else { 1938 /* ...forward it to all interfaces. */ 1939 sc->sc_ifp->if_imcasts++; 1940 dst_if = NULL; 1941 } 1942 1943 /* 1944 * If we have a destination interface which is a member of our bridge, 1945 * OR this is a unicast packet, push it through the bpf(4) machinery. 1946 * For broadcast or multicast packets, don't bother because it will 1947 * be reinjected into ether_input. We do this before we pass the packets 1948 * through the pfil(9) framework, as it is possible that pfil(9) will 1949 * drop the packet, or possibly modify it, making it difficult to debug 1950 * firewall issues on the bridge. 1951 */ 1952 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 1953 BPF_MTAP(ifp, m); 1954 1955 /* run the packet filter */ 1956 if (inet_pfil_hook.ph_busy_count >= 0 1957 #ifdef INET6 1958 || inet6_pfil_hook.ph_busy_count >= 0 1959 #endif 1960 ) { 1961 BRIDGE_UNLOCK(sc); 1962 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 1963 return; 1964 if (m == NULL) 1965 return; 1966 BRIDGE_LOCK(sc); 1967 } 1968 1969 if (dst_if == NULL) { 1970 bridge_broadcast(sc, src_if, m, 1); 1971 return; 1972 } 1973 1974 /* 1975 * At this point, we're dealing with a unicast frame 1976 * going to a different interface. 1977 */ 1978 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1979 BRIDGE_UNLOCK(sc); 1980 m_freem(m); 1981 return; 1982 } 1983 dbif = bridge_lookup_member_if(sc, dst_if); 1984 if (dbif == NULL) { 1985 /* Not a member of the bridge (anymore?) */ 1986 BRIDGE_UNLOCK(sc); 1987 m_freem(m); 1988 return; 1989 } 1990 1991 /* Private segments can not talk to each other */ 1992 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) { 1993 BRIDGE_UNLOCK(sc); 1994 m_freem(m); 1995 return; 1996 } 1997 1998 if ((dbif->bif_flags & IFBIF_STP) && 1999 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2000 BRIDGE_UNLOCK(sc); 2001 m_freem(m); 2002 return; 2003 } 2004 2005 BRIDGE_UNLOCK(sc); 2006 2007 if (inet_pfil_hook.ph_busy_count >= 0 2008 #ifdef INET6 2009 || inet6_pfil_hook.ph_busy_count >= 0 2010 #endif 2011 ) { 2012 if (bridge_pfil(&m, sc->sc_ifp, dst_if, PFIL_OUT) != 0) 2013 return; 2014 if (m == NULL) 2015 return; 2016 } 2017 2018 bridge_enqueue(sc, dst_if, m); 2019 } 2020 2021 /* 2022 * bridge_input: 2023 * 2024 * Receive input from a member interface. Queue the packet for 2025 * bridging if it is not for us. 2026 */ 2027 static struct mbuf * 2028 bridge_input(struct ifnet *ifp, struct mbuf *m) 2029 { 2030 struct bridge_softc *sc = ifp->if_bridge; 2031 struct bridge_iflist *bif, *bif2; 2032 struct ifnet *bifp; 2033 struct ether_header *eh; 2034 struct mbuf *mc, *mc2; 2035 2036 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2037 return (m); 2038 2039 bifp = sc->sc_ifp; 2040 2041 /* 2042 * Implement support for bridge monitoring. If this flag has been 2043 * set on this interface, discard the packet once we push it through 2044 * the bpf(4) machinery, but before we do, increment the byte and 2045 * packet counters associated with this interface. 2046 */ 2047 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2048 m->m_pkthdr.rcvif = bifp; 2049 BPF_MTAP(bifp, m); 2050 bifp->if_ipackets++; 2051 bifp->if_ibytes += m->m_pkthdr.len; 2052 m_freem(m); 2053 return (NULL); 2054 } 2055 BRIDGE_LOCK(sc); 2056 bif = bridge_lookup_member_if(sc, ifp); 2057 if (bif == NULL) { 2058 BRIDGE_UNLOCK(sc); 2059 return (m); 2060 } 2061 2062 eh = mtod(m, struct ether_header *); 2063 2064 if (memcmp(eh->ether_dhost, IF_LLADDR(bifp), 2065 ETHER_ADDR_LEN) == 0) { 2066 /* Block redundant paths to us */ 2067 if ((bif->bif_flags & IFBIF_STP) && 2068 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2069 BRIDGE_UNLOCK(sc); 2070 return (m); 2071 } 2072 2073 /* 2074 * Filter on the physical interface. 2075 */ 2076 if (pfil_local_phys && (inet_pfil_hook.ph_busy_count >= 0 2077 #ifdef INET6 2078 || inet6_pfil_hook.ph_busy_count >= 0 2079 #endif 2080 )) { 2081 if (bridge_pfil(&m, NULL, ifp, PFIL_IN) != 0 || 2082 m == NULL) { 2083 BRIDGE_UNLOCK(sc); 2084 return (NULL); 2085 } 2086 } 2087 2088 /* 2089 * If the packet is for us, set the packets source as the 2090 * bridge, and return the packet back to ether_input for 2091 * local processing. 2092 */ 2093 2094 /* Note where to send the reply to */ 2095 if (bif->bif_flags & IFBIF_LEARNING) 2096 (void) bridge_rtupdate(sc, 2097 eh->ether_shost, bif, 0, IFBAF_DYNAMIC); 2098 2099 /* Mark the packet as arriving on the bridge interface */ 2100 m->m_pkthdr.rcvif = bifp; 2101 BPF_MTAP(bifp, m); 2102 bifp->if_ipackets++; 2103 2104 BRIDGE_UNLOCK(sc); 2105 return (m); 2106 } 2107 2108 bridge_span(sc, m); 2109 2110 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 2111 /* Tap off 802.1D packets; they do not get forwarded. */ 2112 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2113 ETHER_ADDR_LEN) == 0) { 2114 m = bstp_input(&bif->bif_stp, ifp, m); 2115 if (m == NULL) { 2116 BRIDGE_UNLOCK(sc); 2117 return (NULL); 2118 } 2119 } 2120 2121 if ((bif->bif_flags & IFBIF_STP) && 2122 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2123 BRIDGE_UNLOCK(sc); 2124 return (m); 2125 } 2126 2127 if (bcmp(etherbroadcastaddr, eh->ether_dhost, 2128 sizeof(etherbroadcastaddr)) == 0) 2129 m->m_flags |= M_BCAST; 2130 else 2131 m->m_flags |= M_MCAST; 2132 2133 /* 2134 * Make a deep copy of the packet and enqueue the copy 2135 * for bridge processing; return the original packet for 2136 * local processing. 2137 */ 2138 mc = m_dup(m, M_DONTWAIT); 2139 if (mc == NULL) { 2140 BRIDGE_UNLOCK(sc); 2141 return (m); 2142 } 2143 2144 /* Perform the bridge forwarding function with the copy. */ 2145 bridge_forward(sc, bif, mc); 2146 2147 /* 2148 * Reinject the mbuf as arriving on the bridge so we have a 2149 * chance at claiming multicast packets. We can not loop back 2150 * here from ether_input as a bridge is never a member of a 2151 * bridge. 2152 */ 2153 KASSERT(bifp->if_bridge == NULL, 2154 ("loop created in bridge_input")); 2155 mc2 = m_dup(m, M_DONTWAIT); 2156 if (mc2 != NULL) { 2157 /* Keep the layer3 header aligned */ 2158 int i = min(mc2->m_pkthdr.len, max_protohdr); 2159 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2160 } 2161 if (mc2 != NULL) { 2162 mc2->m_pkthdr.rcvif = bifp; 2163 (*bifp->if_input)(bifp, mc2); 2164 } 2165 2166 /* Return the original packet for local processing. */ 2167 return (m); 2168 } 2169 2170 if ((bif->bif_flags & IFBIF_STP) && 2171 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2172 BRIDGE_UNLOCK(sc); 2173 return (m); 2174 } 2175 2176 #ifdef DEV_CARP 2177 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2178 || ((iface)->if_carp \ 2179 && carp_forus((iface)->if_carp, eh->ether_dhost)) 2180 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2181 || ((iface)->if_carp \ 2182 && carp_forus((iface)->if_carp, eh->ether_shost)) 2183 #else 2184 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2185 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2186 #endif 2187 2188 #define GRAB_OUR_PACKETS(iface) \ 2189 if ((iface)->if_type == IFT_GIF) \ 2190 continue; \ 2191 /* It is destined for us. */ \ 2192 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2193 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2194 ) { \ 2195 if (bif->bif_flags & IFBIF_LEARNING) \ 2196 (void) bridge_rtupdate(sc, \ 2197 eh->ether_shost, bif, 0, IFBAF_DYNAMIC); \ 2198 m->m_pkthdr.rcvif = iface; \ 2199 BRIDGE_UNLOCK(sc); \ 2200 return (m); \ 2201 } \ 2202 \ 2203 /* We just received a packet that we sent out. */ \ 2204 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2205 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2206 ) { \ 2207 BRIDGE_UNLOCK(sc); \ 2208 m_freem(m); \ 2209 return (NULL); \ 2210 } 2211 2212 /* 2213 * Unicast. Make sure it's not for us. 2214 * 2215 * Give a chance for ifp at first priority. This will help when the 2216 * packet comes through the interface like VLAN's with the same MACs 2217 * on several interfaces from the same bridge. This also will save 2218 * some CPU cycles in case the destination interface and the input 2219 * interface (eq ifp) are the same. 2220 */ 2221 do { GRAB_OUR_PACKETS(ifp) } while (0); 2222 2223 /* Now check the all bridge members. */ 2224 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2225 GRAB_OUR_PACKETS(bif2->bif_ifp) 2226 } 2227 2228 #undef OR_CARP_CHECK_WE_ARE_DST 2229 #undef OR_CARP_CHECK_WE_ARE_SRC 2230 #undef GRAB_OUR_PACKETS 2231 2232 /* Perform the bridge forwarding function. */ 2233 bridge_forward(sc, bif, m); 2234 2235 return (NULL); 2236 } 2237 2238 /* 2239 * bridge_broadcast: 2240 * 2241 * Send a frame to all interfaces that are members of 2242 * the bridge, except for the one on which the packet 2243 * arrived. 2244 * 2245 * NOTE: Releases the lock on return. 2246 */ 2247 static void 2248 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2249 struct mbuf *m, int runfilt) 2250 { 2251 struct bridge_iflist *dbif, *sbif; 2252 struct mbuf *mc; 2253 struct ifnet *dst_if; 2254 int error = 0, used = 0, i; 2255 2256 sbif = bridge_lookup_member_if(sc, src_if); 2257 2258 BRIDGE_LOCK2REF(sc, error); 2259 if (error) { 2260 m_freem(m); 2261 return; 2262 } 2263 2264 /* Filter on the bridge interface before broadcasting */ 2265 if (runfilt && (inet_pfil_hook.ph_busy_count >= 0 2266 #ifdef INET6 2267 || inet6_pfil_hook.ph_busy_count >= 0 2268 #endif 2269 )) { 2270 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2271 goto out; 2272 if (m == NULL) 2273 goto out; 2274 } 2275 2276 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2277 dst_if = dbif->bif_ifp; 2278 if (dst_if == src_if) 2279 continue; 2280 2281 /* Private segments can not talk to each other */ 2282 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2283 continue; 2284 2285 if ((dbif->bif_flags & IFBIF_STP) && 2286 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2287 continue; 2288 2289 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2290 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2291 continue; 2292 2293 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2294 continue; 2295 2296 if (LIST_NEXT(dbif, bif_next) == NULL) { 2297 mc = m; 2298 used = 1; 2299 } else { 2300 mc = m_dup(m, M_DONTWAIT); 2301 if (mc == NULL) { 2302 sc->sc_ifp->if_oerrors++; 2303 continue; 2304 } 2305 } 2306 2307 /* 2308 * Filter on the output interface. Pass a NULL bridge interface 2309 * pointer so we do not redundantly filter on the bridge for 2310 * each interface we broadcast on. 2311 */ 2312 if (runfilt && (inet_pfil_hook.ph_busy_count >= 0 2313 #ifdef INET6 2314 || inet6_pfil_hook.ph_busy_count >= 0 2315 #endif 2316 )) { 2317 if (used == 0) { 2318 /* Keep the layer3 header aligned */ 2319 i = min(mc->m_pkthdr.len, max_protohdr); 2320 mc = m_copyup(mc, i, ETHER_ALIGN); 2321 if (mc == NULL) { 2322 sc->sc_ifp->if_oerrors++; 2323 continue; 2324 } 2325 } 2326 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2327 continue; 2328 if (mc == NULL) 2329 continue; 2330 } 2331 2332 bridge_enqueue(sc, dst_if, mc); 2333 } 2334 if (used == 0) 2335 m_freem(m); 2336 2337 out: 2338 BRIDGE_UNREF(sc); 2339 } 2340 2341 /* 2342 * bridge_span: 2343 * 2344 * Duplicate a packet out one or more interfaces that are in span mode, 2345 * the original mbuf is unmodified. 2346 */ 2347 static void 2348 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2349 { 2350 struct bridge_iflist *bif; 2351 struct ifnet *dst_if; 2352 struct mbuf *mc; 2353 2354 if (LIST_EMPTY(&sc->sc_spanlist)) 2355 return; 2356 2357 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2358 dst_if = bif->bif_ifp; 2359 2360 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2361 continue; 2362 2363 mc = m_copypacket(m, M_DONTWAIT); 2364 if (mc == NULL) { 2365 sc->sc_ifp->if_oerrors++; 2366 continue; 2367 } 2368 2369 bridge_enqueue(sc, dst_if, mc); 2370 } 2371 } 2372 2373 /* 2374 * bridge_rtupdate: 2375 * 2376 * Add a bridge routing entry. 2377 */ 2378 static int 2379 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, 2380 struct bridge_iflist *bif, int setflags, uint8_t flags) 2381 { 2382 struct bridge_rtnode *brt; 2383 struct ifnet *dst_if = bif->bif_ifp; 2384 int error; 2385 2386 BRIDGE_LOCK_ASSERT(sc); 2387 2388 /* 2389 * A route for this destination might already exist. If so, 2390 * update it, otherwise create a new one. 2391 */ 2392 if ((brt = bridge_rtnode_lookup(sc, dst)) == NULL) { 2393 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2394 sc->sc_brtexceeded++; 2395 return (ENOSPC); 2396 } 2397 2398 /* 2399 * Allocate a new bridge forwarding node, and 2400 * initialize the expiration time and Ethernet 2401 * address. 2402 */ 2403 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2404 if (brt == NULL) 2405 return (ENOMEM); 2406 2407 if (bif->bif_flags & IFBIF_STICKY) 2408 brt->brt_flags = IFBAF_STICKY; 2409 else 2410 brt->brt_flags = IFBAF_DYNAMIC; 2411 2412 brt->brt_ifp = dst_if; 2413 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2414 2415 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2416 uma_zfree(bridge_rtnode_zone, brt); 2417 return (error); 2418 } 2419 } 2420 2421 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2422 brt->brt_ifp = dst_if; 2423 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2424 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2425 if (setflags) 2426 brt->brt_flags = flags; 2427 2428 return (0); 2429 } 2430 2431 /* 2432 * bridge_rtlookup: 2433 * 2434 * Lookup the destination interface for an address. 2435 */ 2436 static struct ifnet * 2437 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr) 2438 { 2439 struct bridge_rtnode *brt; 2440 2441 BRIDGE_LOCK_ASSERT(sc); 2442 2443 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 2444 return (NULL); 2445 2446 return (brt->brt_ifp); 2447 } 2448 2449 /* 2450 * bridge_rttrim: 2451 * 2452 * Trim the routine table so that we have a number 2453 * of routing entries less than or equal to the 2454 * maximum number. 2455 */ 2456 static void 2457 bridge_rttrim(struct bridge_softc *sc) 2458 { 2459 struct bridge_rtnode *brt, *nbrt; 2460 2461 BRIDGE_LOCK_ASSERT(sc); 2462 2463 /* Make sure we actually need to do this. */ 2464 if (sc->sc_brtcnt <= sc->sc_brtmax) 2465 return; 2466 2467 /* Force an aging cycle; this might trim enough addresses. */ 2468 bridge_rtage(sc); 2469 if (sc->sc_brtcnt <= sc->sc_brtmax) 2470 return; 2471 2472 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2473 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2474 bridge_rtnode_destroy(sc, brt); 2475 if (sc->sc_brtcnt <= sc->sc_brtmax) 2476 return; 2477 } 2478 } 2479 } 2480 2481 /* 2482 * bridge_timer: 2483 * 2484 * Aging timer for the bridge. 2485 */ 2486 static void 2487 bridge_timer(void *arg) 2488 { 2489 struct bridge_softc *sc = arg; 2490 2491 BRIDGE_LOCK_ASSERT(sc); 2492 2493 bridge_rtage(sc); 2494 2495 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2496 callout_reset(&sc->sc_brcallout, 2497 bridge_rtable_prune_period * hz, bridge_timer, sc); 2498 } 2499 2500 /* 2501 * bridge_rtage: 2502 * 2503 * Perform an aging cycle. 2504 */ 2505 static void 2506 bridge_rtage(struct bridge_softc *sc) 2507 { 2508 struct bridge_rtnode *brt, *nbrt; 2509 2510 BRIDGE_LOCK_ASSERT(sc); 2511 2512 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2513 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2514 if (time_uptime >= brt->brt_expire) 2515 bridge_rtnode_destroy(sc, brt); 2516 } 2517 } 2518 } 2519 2520 /* 2521 * bridge_rtflush: 2522 * 2523 * Remove all dynamic addresses from the bridge. 2524 */ 2525 static void 2526 bridge_rtflush(struct bridge_softc *sc, int full) 2527 { 2528 struct bridge_rtnode *brt, *nbrt; 2529 2530 BRIDGE_LOCK_ASSERT(sc); 2531 2532 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2533 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2534 bridge_rtnode_destroy(sc, brt); 2535 } 2536 } 2537 2538 /* 2539 * bridge_rtdaddr: 2540 * 2541 * Remove an address from the table. 2542 */ 2543 static int 2544 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr) 2545 { 2546 struct bridge_rtnode *brt; 2547 2548 BRIDGE_LOCK_ASSERT(sc); 2549 2550 if ((brt = bridge_rtnode_lookup(sc, addr)) == NULL) 2551 return (ENOENT); 2552 2553 bridge_rtnode_destroy(sc, brt); 2554 return (0); 2555 } 2556 2557 /* 2558 * bridge_rtdelete: 2559 * 2560 * Delete routes to a speicifc member interface. 2561 */ 2562 static void 2563 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2564 { 2565 struct bridge_rtnode *brt, *nbrt; 2566 2567 BRIDGE_LOCK_ASSERT(sc); 2568 2569 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2570 if (brt->brt_ifp == ifp && (full || 2571 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2572 bridge_rtnode_destroy(sc, brt); 2573 } 2574 } 2575 2576 /* 2577 * bridge_rtable_init: 2578 * 2579 * Initialize the route table for this bridge. 2580 */ 2581 static int 2582 bridge_rtable_init(struct bridge_softc *sc) 2583 { 2584 int i; 2585 2586 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2587 M_DEVBUF, M_NOWAIT); 2588 if (sc->sc_rthash == NULL) 2589 return (ENOMEM); 2590 2591 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2592 LIST_INIT(&sc->sc_rthash[i]); 2593 2594 sc->sc_rthash_key = arc4random(); 2595 2596 LIST_INIT(&sc->sc_rtlist); 2597 2598 return (0); 2599 } 2600 2601 /* 2602 * bridge_rtable_fini: 2603 * 2604 * Deconstruct the route table for this bridge. 2605 */ 2606 static void 2607 bridge_rtable_fini(struct bridge_softc *sc) 2608 { 2609 2610 free(sc->sc_rthash, M_DEVBUF); 2611 } 2612 2613 /* 2614 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2615 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2616 */ 2617 #define mix(a, b, c) \ 2618 do { \ 2619 a -= b; a -= c; a ^= (c >> 13); \ 2620 b -= c; b -= a; b ^= (a << 8); \ 2621 c -= a; c -= b; c ^= (b >> 13); \ 2622 a -= b; a -= c; a ^= (c >> 12); \ 2623 b -= c; b -= a; b ^= (a << 16); \ 2624 c -= a; c -= b; c ^= (b >> 5); \ 2625 a -= b; a -= c; a ^= (c >> 3); \ 2626 b -= c; b -= a; b ^= (a << 10); \ 2627 c -= a; c -= b; c ^= (b >> 15); \ 2628 } while (/*CONSTCOND*/0) 2629 2630 static __inline uint32_t 2631 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2632 { 2633 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2634 2635 b += addr[5] << 8; 2636 b += addr[4]; 2637 a += addr[3] << 24; 2638 a += addr[2] << 16; 2639 a += addr[1] << 8; 2640 a += addr[0]; 2641 2642 mix(a, b, c); 2643 2644 return (c & BRIDGE_RTHASH_MASK); 2645 } 2646 2647 #undef mix 2648 2649 static int 2650 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2651 { 2652 int i, d; 2653 2654 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2655 d = ((int)a[i]) - ((int)b[i]); 2656 } 2657 2658 return (d); 2659 } 2660 2661 /* 2662 * bridge_rtnode_lookup: 2663 * 2664 * Look up a bridge route node for the specified destination. 2665 */ 2666 static struct bridge_rtnode * 2667 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr) 2668 { 2669 struct bridge_rtnode *brt; 2670 uint32_t hash; 2671 int dir; 2672 2673 BRIDGE_LOCK_ASSERT(sc); 2674 2675 hash = bridge_rthash(sc, addr); 2676 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2677 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2678 if (dir == 0) 2679 return (brt); 2680 if (dir > 0) 2681 return (NULL); 2682 } 2683 2684 return (NULL); 2685 } 2686 2687 /* 2688 * bridge_rtnode_insert: 2689 * 2690 * Insert the specified bridge node into the route table. We 2691 * assume the entry is not already in the table. 2692 */ 2693 static int 2694 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2695 { 2696 struct bridge_rtnode *lbrt; 2697 uint32_t hash; 2698 int dir; 2699 2700 BRIDGE_LOCK_ASSERT(sc); 2701 2702 hash = bridge_rthash(sc, brt->brt_addr); 2703 2704 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2705 if (lbrt == NULL) { 2706 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2707 goto out; 2708 } 2709 2710 do { 2711 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2712 if (dir == 0) 2713 return (EEXIST); 2714 if (dir > 0) { 2715 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2716 goto out; 2717 } 2718 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2719 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2720 goto out; 2721 } 2722 lbrt = LIST_NEXT(lbrt, brt_hash); 2723 } while (lbrt != NULL); 2724 2725 #ifdef DIAGNOSTIC 2726 panic("bridge_rtnode_insert: impossible"); 2727 #endif 2728 2729 out: 2730 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2731 sc->sc_brtcnt++; 2732 2733 return (0); 2734 } 2735 2736 /* 2737 * bridge_rtnode_destroy: 2738 * 2739 * Destroy a bridge rtnode. 2740 */ 2741 static void 2742 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2743 { 2744 BRIDGE_LOCK_ASSERT(sc); 2745 2746 LIST_REMOVE(brt, brt_hash); 2747 2748 LIST_REMOVE(brt, brt_list); 2749 sc->sc_brtcnt--; 2750 uma_zfree(bridge_rtnode_zone, brt); 2751 } 2752 2753 /* 2754 * bridge_rtable_expire: 2755 * 2756 * Set the expiry time for all routes on an interface. 2757 */ 2758 static void 2759 bridge_rtable_expire(struct ifnet *ifp, int age) 2760 { 2761 struct bridge_softc *sc = ifp->if_bridge; 2762 struct bridge_rtnode *brt; 2763 2764 BRIDGE_LOCK(sc); 2765 2766 /* 2767 * If the age is zero then flush, otherwise set all the expiry times to 2768 * age for the interface 2769 */ 2770 if (age == 0) 2771 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 2772 else { 2773 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2774 /* Cap the expiry time to 'age' */ 2775 if (brt->brt_ifp == ifp && 2776 brt->brt_expire > time_uptime + age && 2777 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2778 brt->brt_expire = time_uptime + age; 2779 } 2780 } 2781 BRIDGE_UNLOCK(sc); 2782 } 2783 2784 /* 2785 * bridge_state_change: 2786 * 2787 * Callback from the bridgestp code when a port changes states. 2788 */ 2789 static void 2790 bridge_state_change(struct ifnet *ifp, int state) 2791 { 2792 struct bridge_softc *sc = ifp->if_bridge; 2793 static const char *stpstates[] = { 2794 "disabled", 2795 "listening", 2796 "learning", 2797 "forwarding", 2798 "blocking", 2799 "discarding" 2800 }; 2801 2802 if (log_stp) 2803 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 2804 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 2805 } 2806 2807 /* 2808 * Send bridge packets through pfil if they are one of the types pfil can deal 2809 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 2810 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 2811 * that interface. 2812 */ 2813 static int 2814 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 2815 { 2816 int snap, error, i, hlen; 2817 struct ether_header *eh1, eh2; 2818 struct ip_fw_args args; 2819 struct ip *ip; 2820 struct llc llc1; 2821 u_int16_t ether_type; 2822 2823 snap = 0; 2824 error = -1; /* Default error if not error == 0 */ 2825 2826 #if 0 2827 /* we may return with the IP fields swapped, ensure its not shared */ 2828 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 2829 #endif 2830 2831 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) 2832 return (0); /* filtering is disabled */ 2833 2834 i = min((*mp)->m_pkthdr.len, max_protohdr); 2835 if ((*mp)->m_len < i) { 2836 *mp = m_pullup(*mp, i); 2837 if (*mp == NULL) { 2838 printf("%s: m_pullup failed\n", __func__); 2839 return (-1); 2840 } 2841 } 2842 2843 eh1 = mtod(*mp, struct ether_header *); 2844 ether_type = ntohs(eh1->ether_type); 2845 2846 /* 2847 * Check for SNAP/LLC. 2848 */ 2849 if (ether_type < ETHERMTU) { 2850 struct llc *llc2 = (struct llc *)(eh1 + 1); 2851 2852 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2853 llc2->llc_dsap == LLC_SNAP_LSAP && 2854 llc2->llc_ssap == LLC_SNAP_LSAP && 2855 llc2->llc_control == LLC_UI) { 2856 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2857 snap = 1; 2858 } 2859 } 2860 2861 /* 2862 * If we're trying to filter bridge traffic, don't look at anything 2863 * other than IP and ARP traffic. If the filter doesn't understand 2864 * IPv6, don't allow IPv6 through the bridge either. This is lame 2865 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2866 * but of course we don't have an AppleTalk filter to begin with. 2867 * (Note that since pfil doesn't understand ARP it will pass *ALL* 2868 * ARP traffic.) 2869 */ 2870 switch (ether_type) { 2871 case ETHERTYPE_ARP: 2872 case ETHERTYPE_REVARP: 2873 if (pfil_ipfw_arp == 0) 2874 return (0); /* Automatically pass */ 2875 break; 2876 2877 case ETHERTYPE_IP: 2878 #ifdef INET6 2879 case ETHERTYPE_IPV6: 2880 #endif /* INET6 */ 2881 break; 2882 default: 2883 /* 2884 * Check to see if the user wants to pass non-ip 2885 * packets, these will not be checked by pfil(9) and 2886 * passed unconditionally so the default is to drop. 2887 */ 2888 if (pfil_onlyip) 2889 goto bad; 2890 } 2891 2892 /* Strip off the Ethernet header and keep a copy. */ 2893 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 2894 m_adj(*mp, ETHER_HDR_LEN); 2895 2896 /* Strip off snap header, if present */ 2897 if (snap) { 2898 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 2899 m_adj(*mp, sizeof(struct llc)); 2900 } 2901 2902 /* 2903 * Check the IP header for alignment and errors 2904 */ 2905 if (dir == PFIL_IN) { 2906 switch (ether_type) { 2907 case ETHERTYPE_IP: 2908 error = bridge_ip_checkbasic(mp); 2909 break; 2910 #ifdef INET6 2911 case ETHERTYPE_IPV6: 2912 error = bridge_ip6_checkbasic(mp); 2913 break; 2914 #endif /* INET6 */ 2915 default: 2916 error = 0; 2917 } 2918 if (error) 2919 goto bad; 2920 } 2921 2922 if (IPFW_LOADED && pfil_ipfw != 0 && dir == PFIL_OUT && ifp != NULL) { 2923 error = -1; 2924 args.rule = ip_dn_claim_rule(*mp); 2925 if (args.rule != NULL && fw_one_pass) 2926 goto ipfwpass; /* packet already partially processed */ 2927 2928 args.m = *mp; 2929 args.oif = ifp; 2930 args.next_hop = NULL; 2931 args.eh = &eh2; 2932 args.inp = NULL; /* used by ipfw uid/gid/jail rules */ 2933 i = ip_fw_chk_ptr(&args); 2934 *mp = args.m; 2935 2936 if (*mp == NULL) 2937 return (error); 2938 2939 if (DUMMYNET_LOADED && (i == IP_FW_DUMMYNET)) { 2940 2941 /* put the Ethernet header back on */ 2942 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 2943 if (*mp == NULL) 2944 return (error); 2945 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 2946 2947 /* 2948 * Pass the pkt to dummynet, which consumes it. The 2949 * packet will return to us via bridge_dummynet(). 2950 */ 2951 args.oif = ifp; 2952 ip_dn_io_ptr(*mp, DN_TO_IFB_FWD, &args); 2953 return (error); 2954 } 2955 2956 if (i != IP_FW_PASS) /* drop */ 2957 goto bad; 2958 } 2959 2960 ipfwpass: 2961 error = 0; 2962 2963 /* 2964 * Run the packet through pfil 2965 */ 2966 switch (ether_type) { 2967 case ETHERTYPE_IP: 2968 /* 2969 * before calling the firewall, swap fields the same as 2970 * IP does. here we assume the header is contiguous 2971 */ 2972 ip = mtod(*mp, struct ip *); 2973 2974 ip->ip_len = ntohs(ip->ip_len); 2975 ip->ip_off = ntohs(ip->ip_off); 2976 2977 /* 2978 * Run pfil on the member interface and the bridge, both can 2979 * be skipped by clearing pfil_member or pfil_bridge. 2980 * 2981 * Keep the order: 2982 * in_if -> bridge_if -> out_if 2983 */ 2984 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 2985 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, 2986 dir, NULL); 2987 2988 if (*mp == NULL || error != 0) /* filter may consume */ 2989 break; 2990 2991 if (pfil_member && ifp != NULL) 2992 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, 2993 dir, NULL); 2994 2995 if (*mp == NULL || error != 0) /* filter may consume */ 2996 break; 2997 2998 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 2999 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, 3000 dir, NULL); 3001 3002 if (*mp == NULL || error != 0) /* filter may consume */ 3003 break; 3004 3005 /* check if we need to fragment the packet */ 3006 if (pfil_member && ifp != NULL && dir == PFIL_OUT) { 3007 i = (*mp)->m_pkthdr.len; 3008 if (i > ifp->if_mtu) { 3009 error = bridge_fragment(ifp, *mp, &eh2, snap, 3010 &llc1); 3011 return (error); 3012 } 3013 } 3014 3015 /* Recalculate the ip checksum and restore byte ordering */ 3016 ip = mtod(*mp, struct ip *); 3017 hlen = ip->ip_hl << 2; 3018 if (hlen < sizeof(struct ip)) 3019 goto bad; 3020 if (hlen > (*mp)->m_len) { 3021 if ((*mp = m_pullup(*mp, hlen)) == 0) 3022 goto bad; 3023 ip = mtod(*mp, struct ip *); 3024 if (ip == NULL) 3025 goto bad; 3026 } 3027 ip->ip_len = htons(ip->ip_len); 3028 ip->ip_off = htons(ip->ip_off); 3029 ip->ip_sum = 0; 3030 if (hlen == sizeof(struct ip)) 3031 ip->ip_sum = in_cksum_hdr(ip); 3032 else 3033 ip->ip_sum = in_cksum(*mp, hlen); 3034 3035 break; 3036 #ifdef INET6 3037 case ETHERTYPE_IPV6: 3038 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3039 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, 3040 dir, NULL); 3041 3042 if (*mp == NULL || error != 0) /* filter may consume */ 3043 break; 3044 3045 if (pfil_member && ifp != NULL) 3046 error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp, 3047 dir, NULL); 3048 3049 if (*mp == NULL || error != 0) /* filter may consume */ 3050 break; 3051 3052 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3053 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, 3054 dir, NULL); 3055 break; 3056 #endif 3057 default: 3058 error = 0; 3059 break; 3060 } 3061 3062 if (*mp == NULL) 3063 return (error); 3064 if (error != 0) 3065 goto bad; 3066 3067 error = -1; 3068 3069 /* 3070 * Finally, put everything back the way it was and return 3071 */ 3072 if (snap) { 3073 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 3074 if (*mp == NULL) 3075 return (error); 3076 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3077 } 3078 3079 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3080 if (*mp == NULL) 3081 return (error); 3082 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3083 3084 return (0); 3085 3086 bad: 3087 m_freem(*mp); 3088 *mp = NULL; 3089 return (error); 3090 } 3091 3092 /* 3093 * Perform basic checks on header size since 3094 * pfil assumes ip_input has already processed 3095 * it for it. Cut-and-pasted from ip_input.c. 3096 * Given how simple the IPv6 version is, 3097 * does the IPv4 version really need to be 3098 * this complicated? 3099 * 3100 * XXX Should we update ipstat here, or not? 3101 * XXX Right now we update ipstat but not 3102 * XXX csum_counter. 3103 */ 3104 static int 3105 bridge_ip_checkbasic(struct mbuf **mp) 3106 { 3107 struct mbuf *m = *mp; 3108 struct ip *ip; 3109 int len, hlen; 3110 u_short sum; 3111 3112 if (*mp == NULL) 3113 return (-1); 3114 3115 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3116 if ((m = m_copyup(m, sizeof(struct ip), 3117 (max_linkhdr + 3) & ~3)) == NULL) { 3118 /* XXXJRT new stat, please */ 3119 ipstat.ips_toosmall++; 3120 goto bad; 3121 } 3122 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3123 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3124 ipstat.ips_toosmall++; 3125 goto bad; 3126 } 3127 } 3128 ip = mtod(m, struct ip *); 3129 if (ip == NULL) goto bad; 3130 3131 if (ip->ip_v != IPVERSION) { 3132 ipstat.ips_badvers++; 3133 goto bad; 3134 } 3135 hlen = ip->ip_hl << 2; 3136 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3137 ipstat.ips_badhlen++; 3138 goto bad; 3139 } 3140 if (hlen > m->m_len) { 3141 if ((m = m_pullup(m, hlen)) == 0) { 3142 ipstat.ips_badhlen++; 3143 goto bad; 3144 } 3145 ip = mtod(m, struct ip *); 3146 if (ip == NULL) goto bad; 3147 } 3148 3149 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3150 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3151 } else { 3152 if (hlen == sizeof(struct ip)) { 3153 sum = in_cksum_hdr(ip); 3154 } else { 3155 sum = in_cksum(m, hlen); 3156 } 3157 } 3158 if (sum) { 3159 ipstat.ips_badsum++; 3160 goto bad; 3161 } 3162 3163 /* Retrieve the packet length. */ 3164 len = ntohs(ip->ip_len); 3165 3166 /* 3167 * Check for additional length bogosity 3168 */ 3169 if (len < hlen) { 3170 ipstat.ips_badlen++; 3171 goto bad; 3172 } 3173 3174 /* 3175 * Check that the amount of data in the buffers 3176 * is as at least much as the IP header would have us expect. 3177 * Drop packet if shorter than we expect. 3178 */ 3179 if (m->m_pkthdr.len < len) { 3180 ipstat.ips_tooshort++; 3181 goto bad; 3182 } 3183 3184 /* Checks out, proceed */ 3185 *mp = m; 3186 return (0); 3187 3188 bad: 3189 *mp = m; 3190 return (-1); 3191 } 3192 3193 #ifdef INET6 3194 /* 3195 * Same as above, but for IPv6. 3196 * Cut-and-pasted from ip6_input.c. 3197 * XXX Should we update ip6stat, or not? 3198 */ 3199 static int 3200 bridge_ip6_checkbasic(struct mbuf **mp) 3201 { 3202 struct mbuf *m = *mp; 3203 struct ip6_hdr *ip6; 3204 3205 /* 3206 * If the IPv6 header is not aligned, slurp it up into a new 3207 * mbuf with space for link headers, in the event we forward 3208 * it. Otherwise, if it is aligned, make sure the entire base 3209 * IPv6 header is in the first mbuf of the chain. 3210 */ 3211 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3212 struct ifnet *inifp = m->m_pkthdr.rcvif; 3213 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3214 (max_linkhdr + 3) & ~3)) == NULL) { 3215 /* XXXJRT new stat, please */ 3216 ip6stat.ip6s_toosmall++; 3217 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3218 goto bad; 3219 } 3220 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3221 struct ifnet *inifp = m->m_pkthdr.rcvif; 3222 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3223 ip6stat.ip6s_toosmall++; 3224 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3225 goto bad; 3226 } 3227 } 3228 3229 ip6 = mtod(m, struct ip6_hdr *); 3230 3231 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3232 ip6stat.ip6s_badvers++; 3233 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3234 goto bad; 3235 } 3236 3237 /* Checks out, proceed */ 3238 *mp = m; 3239 return (0); 3240 3241 bad: 3242 *mp = m; 3243 return (-1); 3244 } 3245 #endif /* INET6 */ 3246 3247 /* 3248 * bridge_fragment: 3249 * 3250 * Return a fragmented mbuf chain. 3251 */ 3252 static int 3253 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, 3254 int snap, struct llc *llc) 3255 { 3256 struct mbuf *m0; 3257 struct ip *ip; 3258 int error = -1; 3259 3260 if (m->m_len < sizeof(struct ip) && 3261 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3262 goto out; 3263 ip = mtod(m, struct ip *); 3264 3265 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist, 3266 CSUM_DELAY_IP); 3267 if (error) 3268 goto out; 3269 3270 /* walk the chain and re-add the Ethernet header */ 3271 for (m0 = m; m0; m0 = m0->m_nextpkt) { 3272 if (error == 0) { 3273 if (snap) { 3274 M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT); 3275 if (m0 == NULL) { 3276 error = ENOBUFS; 3277 continue; 3278 } 3279 bcopy(llc, mtod(m0, caddr_t), 3280 sizeof(struct llc)); 3281 } 3282 M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT); 3283 if (m0 == NULL) { 3284 error = ENOBUFS; 3285 continue; 3286 } 3287 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); 3288 } else 3289 m_freem(m); 3290 } 3291 3292 if (error == 0) 3293 ipstat.ips_fragmented++; 3294 3295 return (error); 3296 3297 out: 3298 if (m != NULL) 3299 m_freem(m); 3300 return (error); 3301 }
Cache object: f981318fb294bb3c5434e3580dbe797e
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