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 #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/priv.h> 105 #include <sys/proc.h> 106 #include <sys/lock.h> 107 #include <sys/mutex.h> 108 109 #include <net/bpf.h> 110 #include <net/if.h> 111 #include <net/if_clone.h> 112 #include <net/if_dl.h> 113 #include <net/if_types.h> 114 #include <net/if_var.h> 115 #include <net/pfil.h> 116 117 #include <netinet/in.h> /* for struct arpcom */ 118 #include <netinet/in_systm.h> 119 #include <netinet/in_var.h> 120 #include <netinet/ip.h> 121 #include <netinet/ip_var.h> 122 #ifdef INET6 123 #include <netinet/ip6.h> 124 #include <netinet6/ip6_var.h> 125 #endif 126 #ifdef DEV_CARP 127 #include <netinet/ip_carp.h> 128 #endif 129 #include <machine/in_cksum.h> 130 #include <netinet/if_ether.h> /* for struct arpcom */ 131 #include <net/bridgestp.h> 132 #include <net/if_bridgevar.h> 133 #include <net/if_llc.h> 134 #include <net/if_vlan_var.h> 135 136 #include <net/route.h> 137 #include <netinet/ip_fw.h> 138 #include <netinet/ip_dummynet.h> 139 140 /* 141 * Size of the route hash table. Must be a power of two. 142 */ 143 #ifndef BRIDGE_RTHASH_SIZE 144 #define BRIDGE_RTHASH_SIZE 1024 145 #endif 146 147 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 148 149 /* 150 * Maximum number of addresses to cache. 151 */ 152 #ifndef BRIDGE_RTABLE_MAX 153 #define BRIDGE_RTABLE_MAX 100 154 #endif 155 156 /* 157 * Timeout (in seconds) for entries learned dynamically. 158 */ 159 #ifndef BRIDGE_RTABLE_TIMEOUT 160 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 161 #endif 162 163 /* 164 * Number of seconds between walks of the route list. 165 */ 166 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 167 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 168 #endif 169 170 /* 171 * List of capabilities to mask on the member interface. 172 */ 173 #define BRIDGE_IFCAPS_MASK IFCAP_TXCSUM 174 175 /* 176 * Bridge interface list entry. 177 */ 178 struct bridge_iflist { 179 LIST_ENTRY(bridge_iflist) bif_next; 180 struct ifnet *bif_ifp; /* member if */ 181 struct bstp_port bif_stp; /* STP state */ 182 uint32_t bif_flags; /* member if flags */ 183 int bif_mutecap; /* member muted caps */ 184 uint32_t bif_addrmax; /* max # of addresses */ 185 uint32_t bif_addrcnt; /* cur. # of addresses */ 186 uint32_t bif_addrexceeded;/* # of address violations */ 187 }; 188 189 /* 190 * Bridge route node. 191 */ 192 struct bridge_rtnode { 193 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 194 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 195 struct bridge_iflist *brt_dst; /* destination if */ 196 unsigned long brt_expire; /* expiration time */ 197 uint8_t brt_flags; /* address flags */ 198 uint8_t brt_addr[ETHER_ADDR_LEN]; 199 uint16_t brt_vlan; /* vlan id */ 200 }; 201 #define brt_ifp brt_dst->bif_ifp 202 203 /* 204 * Software state for each bridge. 205 */ 206 struct bridge_softc { 207 struct ifnet *sc_ifp; /* make this an interface */ 208 LIST_ENTRY(bridge_softc) sc_list; 209 struct mtx sc_mtx; 210 struct cv sc_cv; 211 uint32_t sc_brtmax; /* max # of addresses */ 212 uint32_t sc_brtcnt; /* cur. # of addresses */ 213 uint32_t sc_brttimeout; /* rt timeout in seconds */ 214 struct callout sc_brcallout; /* bridge callout */ 215 uint32_t sc_iflist_ref; /* refcount for sc_iflist */ 216 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ 217 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 218 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 219 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 220 uint32_t sc_rthash_key; /* key for hash */ 221 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 222 struct bstp_state sc_stp; /* STP state */ 223 uint32_t sc_brtexceeded; /* # of cache drops */ 224 }; 225 226 static struct mtx bridge_list_mtx; 227 eventhandler_tag bridge_detach_cookie = NULL; 228 229 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 230 231 uma_zone_t bridge_rtnode_zone; 232 233 static int bridge_clone_create(struct if_clone *, int, caddr_t); 234 static void bridge_clone_destroy(struct ifnet *); 235 236 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 237 static void bridge_mutecaps(struct bridge_iflist *, int); 238 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 239 static void bridge_init(void *); 240 static void bridge_dummynet(struct mbuf *, struct ifnet *); 241 static void bridge_stop(struct ifnet *, int); 242 static void bridge_start(struct ifnet *); 243 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 244 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 245 struct rtentry *); 246 static void bridge_enqueue(struct bridge_softc *, struct ifnet *, 247 struct mbuf *); 248 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 249 250 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 251 struct mbuf *m); 252 253 static void bridge_timer(void *); 254 255 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 256 struct mbuf *, int); 257 static void bridge_span(struct bridge_softc *, struct mbuf *); 258 259 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 260 uint16_t, struct bridge_iflist *, int, uint8_t); 261 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 262 uint16_t); 263 static void bridge_rttrim(struct bridge_softc *); 264 static void bridge_rtage(struct bridge_softc *); 265 static void bridge_rtflush(struct bridge_softc *, int); 266 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 267 uint16_t); 268 269 static int bridge_rtable_init(struct bridge_softc *); 270 static void bridge_rtable_fini(struct bridge_softc *); 271 272 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 273 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 274 const uint8_t *, uint16_t); 275 static int bridge_rtnode_insert(struct bridge_softc *, 276 struct bridge_rtnode *); 277 static void bridge_rtnode_destroy(struct bridge_softc *, 278 struct bridge_rtnode *); 279 static void bridge_rtable_expire(struct ifnet *, int); 280 static void bridge_state_change(struct ifnet *, int); 281 282 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 283 const char *name); 284 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 285 struct ifnet *ifp); 286 static void bridge_delete_member(struct bridge_softc *, 287 struct bridge_iflist *, int); 288 static void bridge_delete_span(struct bridge_softc *, 289 struct bridge_iflist *); 290 291 static int bridge_ioctl_add(struct bridge_softc *, void *); 292 static int bridge_ioctl_del(struct bridge_softc *, void *); 293 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 294 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 295 static int bridge_ioctl_scache(struct bridge_softc *, void *); 296 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 297 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 298 static int bridge_ioctl_rts(struct bridge_softc *, void *); 299 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 300 static int bridge_ioctl_sto(struct bridge_softc *, void *); 301 static int bridge_ioctl_gto(struct bridge_softc *, void *); 302 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 303 static int bridge_ioctl_flush(struct bridge_softc *, void *); 304 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 305 static int bridge_ioctl_spri(struct bridge_softc *, void *); 306 static int bridge_ioctl_ght(struct bridge_softc *, void *); 307 static int bridge_ioctl_sht(struct bridge_softc *, void *); 308 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 309 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 310 static int bridge_ioctl_gma(struct bridge_softc *, void *); 311 static int bridge_ioctl_sma(struct bridge_softc *, void *); 312 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 313 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 314 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 315 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 316 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 317 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 318 static int bridge_ioctl_grte(struct bridge_softc *, void *); 319 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 320 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 321 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 322 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 323 int); 324 static int bridge_ip_checkbasic(struct mbuf **mp); 325 #ifdef INET6 326 static int bridge_ip6_checkbasic(struct mbuf **mp); 327 #endif /* INET6 */ 328 static int bridge_fragment(struct ifnet *, struct mbuf *, 329 struct ether_header *, int, struct llc *); 330 331 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 332 #define VLANTAGOF(_m) \ 333 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 334 335 static struct bstp_cb_ops bridge_ops = { 336 .bcb_state = bridge_state_change, 337 .bcb_rtage = bridge_rtable_expire 338 }; 339 340 SYSCTL_DECL(_net_link); 341 SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 342 343 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */ 344 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */ 345 static int pfil_member = 1; /* run pfil hooks on the member interface */ 346 static int pfil_ipfw = 0; /* layer2 filter with ipfw */ 347 static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */ 348 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for 349 locally destined packets */ 350 static int log_stp = 0; /* log STP state changes */ 351 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW, 352 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled"); 353 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW, 354 &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2"); 355 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW, 356 &pfil_bridge, 0, "Packet filter on the bridge interface"); 357 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW, 358 &pfil_member, 0, "Packet filter on the member interface"); 359 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW, 360 &pfil_local_phys, 0, 361 "Packet filter on the physical interface for locally destined packets"); 362 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW, 363 &log_stp, 0, "Log STP state changes"); 364 365 struct bridge_control { 366 int (*bc_func)(struct bridge_softc *, void *); 367 int bc_argsize; 368 int bc_flags; 369 }; 370 371 #define BC_F_COPYIN 0x01 /* copy arguments in */ 372 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 373 #define BC_F_SUSER 0x04 /* do super-user check */ 374 375 const struct bridge_control bridge_control_table[] = { 376 { bridge_ioctl_add, sizeof(struct ifbreq), 377 BC_F_COPYIN|BC_F_SUSER }, 378 { bridge_ioctl_del, sizeof(struct ifbreq), 379 BC_F_COPYIN|BC_F_SUSER }, 380 381 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 382 BC_F_COPYIN|BC_F_COPYOUT }, 383 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 384 BC_F_COPYIN|BC_F_SUSER }, 385 386 { bridge_ioctl_scache, sizeof(struct ifbrparam), 387 BC_F_COPYIN|BC_F_SUSER }, 388 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 389 BC_F_COPYOUT }, 390 391 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 392 BC_F_COPYIN|BC_F_COPYOUT }, 393 { bridge_ioctl_rts, sizeof(struct ifbaconf), 394 BC_F_COPYIN|BC_F_COPYOUT }, 395 396 { bridge_ioctl_saddr, sizeof(struct ifbareq), 397 BC_F_COPYIN|BC_F_SUSER }, 398 399 { bridge_ioctl_sto, sizeof(struct ifbrparam), 400 BC_F_COPYIN|BC_F_SUSER }, 401 { bridge_ioctl_gto, sizeof(struct ifbrparam), 402 BC_F_COPYOUT }, 403 404 { bridge_ioctl_daddr, sizeof(struct ifbareq), 405 BC_F_COPYIN|BC_F_SUSER }, 406 407 { bridge_ioctl_flush, sizeof(struct ifbreq), 408 BC_F_COPYIN|BC_F_SUSER }, 409 410 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 411 BC_F_COPYOUT }, 412 { bridge_ioctl_spri, sizeof(struct ifbrparam), 413 BC_F_COPYIN|BC_F_SUSER }, 414 415 { bridge_ioctl_ght, sizeof(struct ifbrparam), 416 BC_F_COPYOUT }, 417 { bridge_ioctl_sht, sizeof(struct ifbrparam), 418 BC_F_COPYIN|BC_F_SUSER }, 419 420 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 421 BC_F_COPYOUT }, 422 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 423 BC_F_COPYIN|BC_F_SUSER }, 424 425 { bridge_ioctl_gma, sizeof(struct ifbrparam), 426 BC_F_COPYOUT }, 427 { bridge_ioctl_sma, sizeof(struct ifbrparam), 428 BC_F_COPYIN|BC_F_SUSER }, 429 430 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 431 BC_F_COPYIN|BC_F_SUSER }, 432 433 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 434 BC_F_COPYIN|BC_F_SUSER }, 435 436 { bridge_ioctl_addspan, sizeof(struct ifbreq), 437 BC_F_COPYIN|BC_F_SUSER }, 438 { bridge_ioctl_delspan, sizeof(struct ifbreq), 439 BC_F_COPYIN|BC_F_SUSER }, 440 441 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 442 BC_F_COPYOUT }, 443 444 { bridge_ioctl_grte, sizeof(struct ifbrparam), 445 BC_F_COPYOUT }, 446 447 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 448 BC_F_COPYIN|BC_F_COPYOUT }, 449 450 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 451 BC_F_COPYIN|BC_F_SUSER }, 452 453 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 454 BC_F_COPYIN|BC_F_SUSER }, 455 456 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 457 BC_F_COPYIN|BC_F_SUSER }, 458 459 }; 460 const int bridge_control_table_size = 461 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 462 463 LIST_HEAD(, bridge_softc) bridge_list; 464 465 IFC_SIMPLE_DECLARE(bridge, 0); 466 467 static int 468 bridge_modevent(module_t mod, int type, void *data) 469 { 470 471 switch (type) { 472 case MOD_LOAD: 473 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF); 474 if_clone_attach(&bridge_cloner); 475 bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 476 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 477 UMA_ALIGN_PTR, 0); 478 LIST_INIT(&bridge_list); 479 bridge_input_p = bridge_input; 480 bridge_output_p = bridge_output; 481 bridge_dn_p = bridge_dummynet; 482 bridge_detach_cookie = EVENTHANDLER_REGISTER( 483 ifnet_departure_event, bridge_ifdetach, NULL, 484 EVENTHANDLER_PRI_ANY); 485 break; 486 case MOD_UNLOAD: 487 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 488 bridge_detach_cookie); 489 if_clone_detach(&bridge_cloner); 490 uma_zdestroy(bridge_rtnode_zone); 491 bridge_input_p = NULL; 492 bridge_output_p = NULL; 493 bridge_dn_p = NULL; 494 mtx_destroy(&bridge_list_mtx); 495 break; 496 default: 497 return (EOPNOTSUPP); 498 } 499 return (0); 500 } 501 502 static moduledata_t bridge_mod = { 503 "if_bridge", 504 bridge_modevent, 505 0 506 }; 507 508 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 509 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 510 511 /* 512 * handler for net.link.bridge.pfil_ipfw 513 */ 514 static int 515 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 516 { 517 int enable = pfil_ipfw; 518 int error; 519 520 error = sysctl_handle_int(oidp, &enable, 0, req); 521 enable = (enable) ? 1 : 0; 522 523 if (enable != pfil_ipfw) { 524 pfil_ipfw = enable; 525 526 /* 527 * Disable pfil so that ipfw doesnt run twice, if the user 528 * really wants both then they can re-enable pfil_bridge and/or 529 * pfil_member. Also allow non-ip packets as ipfw can filter by 530 * layer2 type. 531 */ 532 if (pfil_ipfw) { 533 pfil_onlyip = 0; 534 pfil_bridge = 0; 535 pfil_member = 0; 536 } 537 } 538 539 return (error); 540 } 541 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW, 542 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW"); 543 544 /* 545 * bridge_clone_create: 546 * 547 * Create a new bridge instance. 548 */ 549 static int 550 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 551 { 552 struct bridge_softc *sc, *sc2; 553 struct ifnet *bifp, *ifp; 554 u_char eaddr[6]; 555 int retry; 556 557 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 558 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 559 if (ifp == NULL) { 560 free(sc, M_DEVBUF); 561 return (ENOSPC); 562 } 563 564 BRIDGE_LOCK_INIT(sc); 565 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 566 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 567 568 /* Initialize our routing table. */ 569 bridge_rtable_init(sc); 570 571 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 572 573 LIST_INIT(&sc->sc_iflist); 574 LIST_INIT(&sc->sc_spanlist); 575 576 ifp->if_softc = sc; 577 if_initname(ifp, ifc->ifc_name, unit); 578 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 579 ifp->if_ioctl = bridge_ioctl; 580 ifp->if_start = bridge_start; 581 ifp->if_init = bridge_init; 582 ifp->if_type = IFT_BRIDGE; 583 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 584 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 585 IFQ_SET_READY(&ifp->if_snd); 586 587 /* 588 * Generate a random ethernet address with a locally administered 589 * address. 590 * 591 * Since we are using random ethernet addresses for the bridge, it is 592 * possible that we might have address collisions, so make sure that 593 * this hardware address isn't already in use on another bridge. 594 */ 595 for (retry = 1; retry != 0;) { 596 arc4rand(eaddr, ETHER_ADDR_LEN, 1); 597 eaddr[0] &= ~1; /* clear multicast bit */ 598 eaddr[0] |= 2; /* set the LAA bit */ 599 retry = 0; 600 mtx_lock(&bridge_list_mtx); 601 LIST_FOREACH(sc2, &bridge_list, sc_list) { 602 bifp = sc2->sc_ifp; 603 if (memcmp(eaddr, IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) 604 retry = 1; 605 } 606 mtx_unlock(&bridge_list_mtx); 607 } 608 609 bstp_attach(&sc->sc_stp, &bridge_ops); 610 ether_ifattach(ifp, eaddr); 611 /* Now undo some of the damage... */ 612 ifp->if_baudrate = 0; 613 ifp->if_type = IFT_BRIDGE; 614 615 mtx_lock(&bridge_list_mtx); 616 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 617 mtx_unlock(&bridge_list_mtx); 618 619 return (0); 620 } 621 622 /* 623 * bridge_clone_destroy: 624 * 625 * Destroy a bridge instance. 626 */ 627 static void 628 bridge_clone_destroy(struct ifnet *ifp) 629 { 630 struct bridge_softc *sc = ifp->if_softc; 631 struct bridge_iflist *bif; 632 633 BRIDGE_LOCK(sc); 634 635 bridge_stop(ifp, 1); 636 ifp->if_flags &= ~IFF_UP; 637 638 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 639 bridge_delete_member(sc, bif, 0); 640 641 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 642 bridge_delete_span(sc, bif); 643 } 644 645 BRIDGE_UNLOCK(sc); 646 647 callout_drain(&sc->sc_brcallout); 648 649 mtx_lock(&bridge_list_mtx); 650 LIST_REMOVE(sc, sc_list); 651 mtx_unlock(&bridge_list_mtx); 652 653 bstp_detach(&sc->sc_stp); 654 ether_ifdetach(ifp); 655 if_free_type(ifp, IFT_ETHER); 656 657 /* Tear down the routing table. */ 658 bridge_rtable_fini(sc); 659 660 BRIDGE_LOCK_DESTROY(sc); 661 free(sc, M_DEVBUF); 662 } 663 664 /* 665 * bridge_ioctl: 666 * 667 * Handle a control request from the operator. 668 */ 669 static int 670 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 671 { 672 struct bridge_softc *sc = ifp->if_softc; 673 struct thread *td = curthread; 674 union { 675 struct ifbreq ifbreq; 676 struct ifbifconf ifbifconf; 677 struct ifbareq ifbareq; 678 struct ifbaconf ifbaconf; 679 struct ifbrparam ifbrparam; 680 struct ifbropreq ifbropreq; 681 } args; 682 struct ifdrv *ifd = (struct ifdrv *) data; 683 const struct bridge_control *bc; 684 int error = 0; 685 686 switch (cmd) { 687 688 case SIOCADDMULTI: 689 case SIOCDELMULTI: 690 break; 691 692 case SIOCGDRVSPEC: 693 case SIOCSDRVSPEC: 694 if (ifd->ifd_cmd >= bridge_control_table_size) { 695 error = EINVAL; 696 break; 697 } 698 bc = &bridge_control_table[ifd->ifd_cmd]; 699 700 if (cmd == SIOCGDRVSPEC && 701 (bc->bc_flags & BC_F_COPYOUT) == 0) { 702 error = EINVAL; 703 break; 704 } 705 else if (cmd == SIOCSDRVSPEC && 706 (bc->bc_flags & BC_F_COPYOUT) != 0) { 707 error = EINVAL; 708 break; 709 } 710 711 if (bc->bc_flags & BC_F_SUSER) { 712 error = priv_check(td, PRIV_NET_BRIDGE); 713 if (error) 714 break; 715 } 716 717 if (ifd->ifd_len != bc->bc_argsize || 718 ifd->ifd_len > sizeof(args)) { 719 error = EINVAL; 720 break; 721 } 722 723 bzero(&args, sizeof(args)); 724 if (bc->bc_flags & BC_F_COPYIN) { 725 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 726 if (error) 727 break; 728 } 729 730 BRIDGE_LOCK(sc); 731 error = (*bc->bc_func)(sc, &args); 732 BRIDGE_UNLOCK(sc); 733 if (error) 734 break; 735 736 if (bc->bc_flags & BC_F_COPYOUT) 737 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 738 739 break; 740 741 case SIOCSIFFLAGS: 742 if (!(ifp->if_flags & IFF_UP) && 743 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 744 /* 745 * If interface is marked down and it is running, 746 * then stop and disable it. 747 */ 748 BRIDGE_LOCK(sc); 749 bridge_stop(ifp, 1); 750 BRIDGE_UNLOCK(sc); 751 } else if ((ifp->if_flags & IFF_UP) && 752 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 753 /* 754 * If interface is marked up and it is stopped, then 755 * start it. 756 */ 757 (*ifp->if_init)(sc); 758 } 759 break; 760 761 case SIOCSIFMTU: 762 /* Do not allow the MTU to be changed on the bridge */ 763 error = EINVAL; 764 break; 765 766 default: 767 /* 768 * drop the lock as ether_ioctl() will call bridge_start() and 769 * cause the lock to be recursed. 770 */ 771 error = ether_ioctl(ifp, cmd, data); 772 break; 773 } 774 775 return (error); 776 } 777 778 /* 779 * bridge_mutecaps: 780 * 781 * Clear or restore unwanted capabilities on the member interface 782 */ 783 static void 784 bridge_mutecaps(struct bridge_iflist *bif, int mute) 785 { 786 struct ifnet *ifp = bif->bif_ifp; 787 struct ifreq ifr; 788 int error; 789 790 if (ifp->if_ioctl == NULL) 791 return; 792 793 bzero(&ifr, sizeof(ifr)); 794 ifr.ifr_reqcap = ifp->if_capenable; 795 796 if (mute) { 797 /* mask off and save capabilities */ 798 bif->bif_mutecap = ifr.ifr_reqcap & BRIDGE_IFCAPS_MASK; 799 if (bif->bif_mutecap != 0) 800 ifr.ifr_reqcap &= ~BRIDGE_IFCAPS_MASK; 801 } else 802 /* restore muted capabilities */ 803 ifr.ifr_reqcap |= bif->bif_mutecap; 804 805 806 if (bif->bif_mutecap != 0) { 807 IFF_LOCKGIANT(ifp); 808 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 809 IFF_UNLOCKGIANT(ifp); 810 } 811 } 812 813 /* 814 * bridge_lookup_member: 815 * 816 * Lookup a bridge member interface. 817 */ 818 static struct bridge_iflist * 819 bridge_lookup_member(struct bridge_softc *sc, const char *name) 820 { 821 struct bridge_iflist *bif; 822 struct ifnet *ifp; 823 824 BRIDGE_LOCK_ASSERT(sc); 825 826 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 827 ifp = bif->bif_ifp; 828 if (strcmp(ifp->if_xname, name) == 0) 829 return (bif); 830 } 831 832 return (NULL); 833 } 834 835 /* 836 * bridge_lookup_member_if: 837 * 838 * Lookup a bridge member interface by ifnet*. 839 */ 840 static struct bridge_iflist * 841 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 842 { 843 struct bridge_iflist *bif; 844 845 BRIDGE_LOCK_ASSERT(sc); 846 847 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 848 if (bif->bif_ifp == member_ifp) 849 return (bif); 850 } 851 852 return (NULL); 853 } 854 855 /* 856 * bridge_delete_member: 857 * 858 * Delete the specified member interface. 859 */ 860 static void 861 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 862 int gone) 863 { 864 struct ifnet *ifs = bif->bif_ifp; 865 866 BRIDGE_LOCK_ASSERT(sc); 867 868 if (!gone) { 869 switch (ifs->if_type) { 870 case IFT_ETHER: 871 case IFT_L2VLAN: 872 /* 873 * Take the interface out of promiscuous mode. 874 */ 875 (void) ifpromisc(ifs, 0); 876 bridge_mutecaps(bif, 0); 877 break; 878 879 case IFT_GIF: 880 break; 881 882 default: 883 #ifdef DIAGNOSTIC 884 panic("bridge_delete_member: impossible"); 885 #endif 886 break; 887 } 888 } 889 890 if (bif->bif_flags & IFBIF_STP) 891 bstp_disable(&bif->bif_stp); 892 893 ifs->if_bridge = NULL; 894 BRIDGE_XLOCK(sc); 895 LIST_REMOVE(bif, bif_next); 896 BRIDGE_XDROP(sc); 897 898 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 899 KASSERT(bif->bif_addrcnt == 0, 900 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 901 902 BRIDGE_UNLOCK(sc); 903 bstp_destroy(&bif->bif_stp); /* prepare to free */ 904 BRIDGE_LOCK(sc); 905 free(bif, M_DEVBUF); 906 } 907 908 /* 909 * bridge_delete_span: 910 * 911 * Delete the specified span interface. 912 */ 913 static void 914 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 915 { 916 BRIDGE_LOCK_ASSERT(sc); 917 918 KASSERT(bif->bif_ifp->if_bridge == NULL, 919 ("%s: not a span interface", __func__)); 920 921 LIST_REMOVE(bif, bif_next); 922 free(bif, M_DEVBUF); 923 } 924 925 static int 926 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 927 { 928 struct ifbreq *req = arg; 929 struct bridge_iflist *bif = NULL; 930 struct ifnet *ifs; 931 int error = 0; 932 933 ifs = ifunit(req->ifbr_ifsname); 934 if (ifs == NULL) 935 return (ENOENT); 936 937 /* If it's in the span list, it can't be a member. */ 938 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 939 if (ifs == bif->bif_ifp) 940 return (EBUSY); 941 942 /* Allow the first Ethernet member to define the MTU */ 943 if (ifs->if_type != IFT_GIF) { 944 if (LIST_EMPTY(&sc->sc_iflist)) 945 sc->sc_ifp->if_mtu = ifs->if_mtu; 946 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 947 if_printf(sc->sc_ifp, "invalid MTU for %s\n", 948 ifs->if_xname); 949 return (EINVAL); 950 } 951 } 952 953 if (ifs->if_bridge == sc) 954 return (EEXIST); 955 956 if (ifs->if_bridge != NULL) 957 return (EBUSY); 958 959 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 960 if (bif == NULL) 961 return (ENOMEM); 962 963 bif->bif_ifp = ifs; 964 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 965 966 switch (ifs->if_type) { 967 case IFT_ETHER: 968 case IFT_L2VLAN: 969 /* 970 * Place the interface into promiscuous mode. 971 */ 972 error = ifpromisc(ifs, 1); 973 if (error) 974 goto out; 975 976 bridge_mutecaps(bif, 1); 977 break; 978 979 case IFT_GIF: 980 break; 981 982 default: 983 error = EINVAL; 984 goto out; 985 } 986 987 ifs->if_bridge = sc; 988 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 989 /* 990 * XXX: XLOCK HERE!?! 991 * 992 * NOTE: insert_***HEAD*** should be safe for the traversals. 993 */ 994 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 995 996 out: 997 if (error) { 998 if (bif != NULL) 999 free(bif, M_DEVBUF); 1000 } 1001 return (error); 1002 } 1003 1004 static int 1005 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1006 { 1007 struct ifbreq *req = arg; 1008 struct bridge_iflist *bif; 1009 1010 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1011 if (bif == NULL) 1012 return (ENOENT); 1013 1014 bridge_delete_member(sc, bif, 0); 1015 1016 return (0); 1017 } 1018 1019 static int 1020 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1021 { 1022 struct ifbreq *req = arg; 1023 struct bridge_iflist *bif; 1024 struct bstp_port *bp; 1025 1026 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1027 if (bif == NULL) 1028 return (ENOENT); 1029 1030 bp = &bif->bif_stp; 1031 req->ifbr_ifsflags = bif->bif_flags; 1032 req->ifbr_state = bp->bp_state; 1033 req->ifbr_priority = bp->bp_priority; 1034 req->ifbr_path_cost = bp->bp_path_cost; 1035 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1036 req->ifbr_proto = bp->bp_protover; 1037 req->ifbr_role = bp->bp_role; 1038 req->ifbr_stpflags = bp->bp_flags; 1039 req->ifbr_addrcnt = bif->bif_addrcnt; 1040 req->ifbr_addrmax = bif->bif_addrmax; 1041 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1042 1043 /* Copy STP state options as flags */ 1044 if (bp->bp_operedge) 1045 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1046 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1047 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1048 if (bp->bp_ptp_link) 1049 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1050 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1051 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1052 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1053 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1054 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1055 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1056 return (0); 1057 } 1058 1059 static int 1060 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1061 { 1062 struct ifbreq *req = arg; 1063 struct bridge_iflist *bif; 1064 struct bstp_port *bp; 1065 int error; 1066 1067 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1068 if (bif == NULL) 1069 return (ENOENT); 1070 bp = &bif->bif_stp; 1071 1072 if (req->ifbr_ifsflags & IFBIF_SPAN) 1073 /* SPAN is readonly */ 1074 return (EINVAL); 1075 1076 if (req->ifbr_ifsflags & IFBIF_STP) { 1077 if ((bif->bif_flags & IFBIF_STP) == 0) { 1078 error = bstp_enable(&bif->bif_stp); 1079 if (error) 1080 return (error); 1081 } 1082 } else { 1083 if ((bif->bif_flags & IFBIF_STP) != 0) 1084 bstp_disable(&bif->bif_stp); 1085 } 1086 1087 /* Pass on STP flags */ 1088 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1089 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1090 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1091 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1092 1093 /* Save the bits relating to the bridge */ 1094 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1095 1096 return (0); 1097 } 1098 1099 static int 1100 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1101 { 1102 struct ifbrparam *param = arg; 1103 1104 sc->sc_brtmax = param->ifbrp_csize; 1105 bridge_rttrim(sc); 1106 1107 return (0); 1108 } 1109 1110 static int 1111 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1112 { 1113 struct ifbrparam *param = arg; 1114 1115 param->ifbrp_csize = sc->sc_brtmax; 1116 1117 return (0); 1118 } 1119 1120 static int 1121 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1122 { 1123 struct ifbifconf *bifc = arg; 1124 struct bridge_iflist *bif; 1125 struct ifbreq breq; 1126 char *buf, *outbuf; 1127 int count, buflen, len, error = 0; 1128 1129 count = 0; 1130 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1131 count++; 1132 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1133 count++; 1134 1135 buflen = sizeof(breq) * count; 1136 if (bifc->ifbic_len == 0) { 1137 bifc->ifbic_len = buflen; 1138 return (0); 1139 } 1140 BRIDGE_UNLOCK(sc); 1141 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1142 BRIDGE_LOCK(sc); 1143 1144 count = 0; 1145 buf = outbuf; 1146 len = min(bifc->ifbic_len, buflen); 1147 bzero(&breq, sizeof(breq)); 1148 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1149 if (len < sizeof(breq)) 1150 break; 1151 1152 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1153 sizeof(breq.ifbr_ifsname)); 1154 /* Fill in the ifbreq structure */ 1155 error = bridge_ioctl_gifflags(sc, &breq); 1156 if (error) 1157 break; 1158 memcpy(buf, &breq, sizeof(breq)); 1159 count++; 1160 buf += sizeof(breq); 1161 len -= sizeof(breq); 1162 } 1163 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1164 if (len < sizeof(breq)) 1165 break; 1166 1167 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1168 sizeof(breq.ifbr_ifsname)); 1169 breq.ifbr_ifsflags = bif->bif_flags; 1170 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1171 memcpy(buf, &breq, sizeof(breq)); 1172 count++; 1173 buf += sizeof(breq); 1174 len -= sizeof(breq); 1175 } 1176 1177 BRIDGE_UNLOCK(sc); 1178 bifc->ifbic_len = sizeof(breq) * count; 1179 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1180 BRIDGE_LOCK(sc); 1181 free(outbuf, M_TEMP); 1182 return (error); 1183 } 1184 1185 static int 1186 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1187 { 1188 struct ifbaconf *bac = arg; 1189 struct bridge_rtnode *brt; 1190 struct ifbareq bareq; 1191 char *buf, *outbuf; 1192 int count, buflen, len, error = 0; 1193 1194 if (bac->ifbac_len == 0) 1195 return (0); 1196 1197 count = 0; 1198 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1199 count++; 1200 buflen = sizeof(bareq) * count; 1201 1202 BRIDGE_UNLOCK(sc); 1203 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1204 BRIDGE_LOCK(sc); 1205 1206 count = 0; 1207 buf = outbuf; 1208 len = min(bac->ifbac_len, buflen); 1209 bzero(&bareq, sizeof(bareq)); 1210 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1211 if (len < sizeof(bareq)) 1212 goto out; 1213 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1214 sizeof(bareq.ifba_ifsname)); 1215 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1216 bareq.ifba_vlan = brt->brt_vlan; 1217 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1218 time_uptime < brt->brt_expire) 1219 bareq.ifba_expire = brt->brt_expire - time_uptime; 1220 else 1221 bareq.ifba_expire = 0; 1222 bareq.ifba_flags = brt->brt_flags; 1223 1224 memcpy(buf, &bareq, sizeof(bareq)); 1225 count++; 1226 buf += sizeof(bareq); 1227 len -= sizeof(bareq); 1228 } 1229 out: 1230 BRIDGE_UNLOCK(sc); 1231 bac->ifbac_len = sizeof(bareq) * count; 1232 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1233 BRIDGE_LOCK(sc); 1234 free(outbuf, M_TEMP); 1235 return (error); 1236 } 1237 1238 static int 1239 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1240 { 1241 struct ifbareq *req = arg; 1242 struct bridge_iflist *bif; 1243 int error; 1244 1245 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1246 if (bif == NULL) 1247 return (ENOENT); 1248 1249 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1250 req->ifba_flags); 1251 1252 return (error); 1253 } 1254 1255 static int 1256 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1257 { 1258 struct ifbrparam *param = arg; 1259 1260 sc->sc_brttimeout = param->ifbrp_ctime; 1261 return (0); 1262 } 1263 1264 static int 1265 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1266 { 1267 struct ifbrparam *param = arg; 1268 1269 param->ifbrp_ctime = sc->sc_brttimeout; 1270 return (0); 1271 } 1272 1273 static int 1274 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1275 { 1276 struct ifbareq *req = arg; 1277 1278 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1279 } 1280 1281 static int 1282 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1283 { 1284 struct ifbreq *req = arg; 1285 1286 bridge_rtflush(sc, req->ifbr_ifsflags); 1287 return (0); 1288 } 1289 1290 static int 1291 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1292 { 1293 struct ifbrparam *param = arg; 1294 struct bstp_state *bs = &sc->sc_stp; 1295 1296 param->ifbrp_prio = bs->bs_bridge_priority; 1297 return (0); 1298 } 1299 1300 static int 1301 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1302 { 1303 struct ifbrparam *param = arg; 1304 1305 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1306 } 1307 1308 static int 1309 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1310 { 1311 struct ifbrparam *param = arg; 1312 struct bstp_state *bs = &sc->sc_stp; 1313 1314 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1315 return (0); 1316 } 1317 1318 static int 1319 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1320 { 1321 struct ifbrparam *param = arg; 1322 1323 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1324 } 1325 1326 static int 1327 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1328 { 1329 struct ifbrparam *param = arg; 1330 struct bstp_state *bs = &sc->sc_stp; 1331 1332 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1333 return (0); 1334 } 1335 1336 static int 1337 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1338 { 1339 struct ifbrparam *param = arg; 1340 1341 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1342 } 1343 1344 static int 1345 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1346 { 1347 struct ifbrparam *param = arg; 1348 struct bstp_state *bs = &sc->sc_stp; 1349 1350 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1351 return (0); 1352 } 1353 1354 static int 1355 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1356 { 1357 struct ifbrparam *param = arg; 1358 1359 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1360 } 1361 1362 static int 1363 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1364 { 1365 struct ifbreq *req = arg; 1366 struct bridge_iflist *bif; 1367 1368 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1369 if (bif == NULL) 1370 return (ENOENT); 1371 1372 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1373 } 1374 1375 static int 1376 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1377 { 1378 struct ifbreq *req = arg; 1379 struct bridge_iflist *bif; 1380 1381 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1382 if (bif == NULL) 1383 return (ENOENT); 1384 1385 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1386 } 1387 1388 static int 1389 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1390 { 1391 struct ifbreq *req = arg; 1392 struct bridge_iflist *bif; 1393 1394 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1395 if (bif == NULL) 1396 return (ENOENT); 1397 1398 bif->bif_addrmax = req->ifbr_addrmax; 1399 return (0); 1400 } 1401 1402 static int 1403 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1404 { 1405 struct ifbreq *req = arg; 1406 struct bridge_iflist *bif = NULL; 1407 struct ifnet *ifs; 1408 1409 ifs = ifunit(req->ifbr_ifsname); 1410 if (ifs == NULL) 1411 return (ENOENT); 1412 1413 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1414 if (ifs == bif->bif_ifp) 1415 return (EBUSY); 1416 1417 if (ifs->if_bridge != NULL) 1418 return (EBUSY); 1419 1420 switch (ifs->if_type) { 1421 case IFT_ETHER: 1422 case IFT_GIF: 1423 case IFT_L2VLAN: 1424 break; 1425 default: 1426 return (EINVAL); 1427 } 1428 1429 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1430 if (bif == NULL) 1431 return (ENOMEM); 1432 1433 bif->bif_ifp = ifs; 1434 bif->bif_flags = IFBIF_SPAN; 1435 1436 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1437 1438 return (0); 1439 } 1440 1441 static int 1442 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1443 { 1444 struct ifbreq *req = arg; 1445 struct bridge_iflist *bif; 1446 struct ifnet *ifs; 1447 1448 ifs = ifunit(req->ifbr_ifsname); 1449 if (ifs == NULL) 1450 return (ENOENT); 1451 1452 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1453 if (ifs == bif->bif_ifp) 1454 break; 1455 1456 if (bif == NULL) 1457 return (ENOENT); 1458 1459 bridge_delete_span(sc, bif); 1460 1461 return (0); 1462 } 1463 1464 static int 1465 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1466 { 1467 struct ifbropreq *req = arg; 1468 struct bstp_state *bs = &sc->sc_stp; 1469 struct bstp_port *root_port; 1470 1471 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1472 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1473 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1474 1475 root_port = bs->bs_root_port; 1476 if (root_port == NULL) 1477 req->ifbop_root_port = 0; 1478 else 1479 req->ifbop_root_port = root_port->bp_ifp->if_index; 1480 1481 req->ifbop_holdcount = bs->bs_txholdcount; 1482 req->ifbop_priority = bs->bs_bridge_priority; 1483 req->ifbop_protocol = bs->bs_protover; 1484 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1485 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1486 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1487 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1488 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1489 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1490 1491 return (0); 1492 } 1493 1494 static int 1495 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1496 { 1497 struct ifbrparam *param = arg; 1498 1499 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1500 return (0); 1501 } 1502 1503 static int 1504 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1505 { 1506 struct ifbpstpconf *bifstp = arg; 1507 struct bridge_iflist *bif; 1508 struct bstp_port *bp; 1509 struct ifbpstpreq bpreq; 1510 char *buf, *outbuf; 1511 int count, buflen, len, error = 0; 1512 1513 count = 0; 1514 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1515 if ((bif->bif_flags & IFBIF_STP) != 0) 1516 count++; 1517 } 1518 1519 buflen = sizeof(bpreq) * count; 1520 if (bifstp->ifbpstp_len == 0) { 1521 bifstp->ifbpstp_len = buflen; 1522 return (0); 1523 } 1524 1525 BRIDGE_UNLOCK(sc); 1526 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1527 BRIDGE_LOCK(sc); 1528 1529 count = 0; 1530 buf = outbuf; 1531 len = min(bifstp->ifbpstp_len, buflen); 1532 bzero(&bpreq, sizeof(bpreq)); 1533 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1534 if (len < sizeof(bpreq)) 1535 break; 1536 1537 if ((bif->bif_flags & IFBIF_STP) == 0) 1538 continue; 1539 1540 bp = &bif->bif_stp; 1541 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1542 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1543 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1544 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1545 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1546 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1547 1548 memcpy(buf, &bpreq, sizeof(bpreq)); 1549 count++; 1550 buf += sizeof(bpreq); 1551 len -= sizeof(bpreq); 1552 } 1553 1554 BRIDGE_UNLOCK(sc); 1555 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1556 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1557 BRIDGE_LOCK(sc); 1558 free(outbuf, M_TEMP); 1559 return (error); 1560 } 1561 1562 static int 1563 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1564 { 1565 struct ifbrparam *param = arg; 1566 1567 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1568 } 1569 1570 static int 1571 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1572 { 1573 struct ifbrparam *param = arg; 1574 1575 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1576 } 1577 1578 /* 1579 * bridge_ifdetach: 1580 * 1581 * Detach an interface from a bridge. Called when a member 1582 * interface is detaching. 1583 */ 1584 static void 1585 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1586 { 1587 struct bridge_softc *sc = ifp->if_bridge; 1588 struct bridge_iflist *bif; 1589 1590 /* Check if the interface is a bridge member */ 1591 if (sc != NULL) { 1592 BRIDGE_LOCK(sc); 1593 1594 bif = bridge_lookup_member_if(sc, ifp); 1595 if (bif != NULL) 1596 bridge_delete_member(sc, bif, 1); 1597 1598 BRIDGE_UNLOCK(sc); 1599 return; 1600 } 1601 1602 /* Check if the interface is a span port */ 1603 mtx_lock(&bridge_list_mtx); 1604 LIST_FOREACH(sc, &bridge_list, sc_list) { 1605 BRIDGE_LOCK(sc); 1606 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1607 if (ifp == bif->bif_ifp) { 1608 bridge_delete_span(sc, bif); 1609 break; 1610 } 1611 1612 BRIDGE_UNLOCK(sc); 1613 } 1614 mtx_unlock(&bridge_list_mtx); 1615 } 1616 1617 /* 1618 * bridge_init: 1619 * 1620 * Initialize a bridge interface. 1621 */ 1622 static void 1623 bridge_init(void *xsc) 1624 { 1625 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1626 struct ifnet *ifp = sc->sc_ifp; 1627 1628 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1629 return; 1630 1631 BRIDGE_LOCK(sc); 1632 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1633 bridge_timer, sc); 1634 1635 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1636 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1637 1638 BRIDGE_UNLOCK(sc); 1639 } 1640 1641 /* 1642 * bridge_stop: 1643 * 1644 * Stop the bridge interface. 1645 */ 1646 static void 1647 bridge_stop(struct ifnet *ifp, int disable) 1648 { 1649 struct bridge_softc *sc = ifp->if_softc; 1650 1651 BRIDGE_LOCK_ASSERT(sc); 1652 1653 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1654 return; 1655 1656 callout_stop(&sc->sc_brcallout); 1657 bstp_stop(&sc->sc_stp); 1658 1659 bridge_rtflush(sc, IFBF_FLUSHDYN); 1660 1661 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1662 } 1663 1664 /* 1665 * bridge_enqueue: 1666 * 1667 * Enqueue a packet on a bridge member interface. 1668 * 1669 */ 1670 static void 1671 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1672 { 1673 int len, err = 0; 1674 short mflags; 1675 struct mbuf *m0; 1676 1677 len = m->m_pkthdr.len; 1678 mflags = m->m_flags; 1679 1680 /* We may be sending a fragment so traverse the mbuf */ 1681 for (; m; m = m0) { 1682 m0 = m->m_nextpkt; 1683 m->m_nextpkt = NULL; 1684 1685 /* 1686 * If underlying interface can not do VLAN tag insertion itself 1687 * then attach a packet tag that holds it. 1688 */ 1689 if ((m->m_flags & M_VLANTAG) && 1690 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1691 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1692 if (m == NULL) { 1693 if_printf(dst_ifp, 1694 "unable to prepend VLAN header\n"); 1695 dst_ifp->if_oerrors++; 1696 continue; 1697 } 1698 m->m_flags &= ~M_VLANTAG; 1699 } 1700 1701 if (err == 0) 1702 IFQ_ENQUEUE(&dst_ifp->if_snd, m, err); 1703 } 1704 1705 if (err == 0) { 1706 1707 sc->sc_ifp->if_opackets++; 1708 sc->sc_ifp->if_obytes += len; 1709 1710 dst_ifp->if_obytes += len; 1711 1712 if (mflags & M_MCAST) { 1713 sc->sc_ifp->if_omcasts++; 1714 dst_ifp->if_omcasts++; 1715 } 1716 } 1717 1718 if ((dst_ifp->if_drv_flags & IFF_DRV_OACTIVE) == 0) 1719 (*dst_ifp->if_start)(dst_ifp); 1720 } 1721 1722 /* 1723 * bridge_dummynet: 1724 * 1725 * Receive a queued packet from dummynet and pass it on to the output 1726 * interface. 1727 * 1728 * The mbuf has the Ethernet header already attached. 1729 */ 1730 static void 1731 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1732 { 1733 struct bridge_softc *sc; 1734 1735 sc = ifp->if_bridge; 1736 1737 /* 1738 * The packet didnt originate from a member interface. This should only 1739 * ever happen if a member interface is removed while packets are 1740 * queued for it. 1741 */ 1742 if (sc == NULL) { 1743 m_freem(m); 1744 return; 1745 } 1746 1747 if (PFIL_HOOKED(&inet_pfil_hook) 1748 #ifdef INET6 1749 || PFIL_HOOKED(&inet6_pfil_hook) 1750 #endif 1751 ) { 1752 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1753 return; 1754 if (m == NULL) 1755 return; 1756 } 1757 1758 bridge_enqueue(sc, ifp, m); 1759 } 1760 1761 /* 1762 * bridge_output: 1763 * 1764 * Send output from a bridge member interface. This 1765 * performs the bridging function for locally originated 1766 * packets. 1767 * 1768 * The mbuf has the Ethernet header already attached. We must 1769 * enqueue or free the mbuf before returning. 1770 */ 1771 static int 1772 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1773 struct rtentry *rt) 1774 { 1775 struct ether_header *eh; 1776 struct ifnet *dst_if; 1777 struct bridge_softc *sc; 1778 uint16_t vlan; 1779 1780 if (m->m_len < ETHER_HDR_LEN) { 1781 m = m_pullup(m, ETHER_HDR_LEN); 1782 if (m == NULL) 1783 return (0); 1784 } 1785 1786 eh = mtod(m, struct ether_header *); 1787 sc = ifp->if_bridge; 1788 vlan = VLANTAGOF(m); 1789 1790 BRIDGE_LOCK(sc); 1791 1792 /* 1793 * If bridge is down, but the original output interface is up, 1794 * go ahead and send out that interface. Otherwise, the packet 1795 * is dropped below. 1796 */ 1797 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1798 dst_if = ifp; 1799 goto sendunicast; 1800 } 1801 1802 /* 1803 * If the packet is a multicast, or we don't know a better way to 1804 * get there, send to all interfaces. 1805 */ 1806 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1807 dst_if = NULL; 1808 else 1809 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 1810 if (dst_if == NULL) { 1811 struct bridge_iflist *bif; 1812 struct mbuf *mc; 1813 int error = 0, used = 0; 1814 1815 bridge_span(sc, m); 1816 1817 BRIDGE_LOCK2REF(sc, error); 1818 if (error) { 1819 m_freem(m); 1820 return (0); 1821 } 1822 1823 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1824 dst_if = bif->bif_ifp; 1825 1826 if (dst_if->if_type == IFT_GIF) 1827 continue; 1828 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 1829 continue; 1830 1831 /* 1832 * If this is not the original output interface, 1833 * and the interface is participating in spanning 1834 * tree, make sure the port is in a state that 1835 * allows forwarding. 1836 */ 1837 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 1838 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 1839 continue; 1840 1841 if (LIST_NEXT(bif, bif_next) == NULL) { 1842 used = 1; 1843 mc = m; 1844 } else { 1845 mc = m_copypacket(m, M_DONTWAIT); 1846 if (mc == NULL) { 1847 sc->sc_ifp->if_oerrors++; 1848 continue; 1849 } 1850 } 1851 1852 bridge_enqueue(sc, dst_if, mc); 1853 } 1854 if (used == 0) 1855 m_freem(m); 1856 BRIDGE_UNREF(sc); 1857 return (0); 1858 } 1859 1860 sendunicast: 1861 /* 1862 * XXX Spanning tree consideration here? 1863 */ 1864 1865 bridge_span(sc, m); 1866 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1867 m_freem(m); 1868 BRIDGE_UNLOCK(sc); 1869 return (0); 1870 } 1871 1872 BRIDGE_UNLOCK(sc); 1873 bridge_enqueue(sc, dst_if, m); 1874 return (0); 1875 } 1876 1877 /* 1878 * bridge_start: 1879 * 1880 * Start output on a bridge. 1881 * 1882 */ 1883 static void 1884 bridge_start(struct ifnet *ifp) 1885 { 1886 struct bridge_softc *sc; 1887 struct mbuf *m; 1888 struct ether_header *eh; 1889 struct ifnet *dst_if; 1890 1891 sc = ifp->if_softc; 1892 1893 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 1894 for (;;) { 1895 IFQ_DEQUEUE(&ifp->if_snd, m); 1896 if (m == 0) 1897 break; 1898 ETHER_BPF_MTAP(ifp, m); 1899 1900 eh = mtod(m, struct ether_header *); 1901 dst_if = NULL; 1902 1903 BRIDGE_LOCK(sc); 1904 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1905 dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1); 1906 } 1907 1908 if (dst_if == NULL) 1909 bridge_broadcast(sc, ifp, m, 0); 1910 else { 1911 BRIDGE_UNLOCK(sc); 1912 bridge_enqueue(sc, dst_if, m); 1913 } 1914 } 1915 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE; 1916 } 1917 1918 /* 1919 * bridge_forward: 1920 * 1921 * The forwarding function of the bridge. 1922 * 1923 * NOTE: Releases the lock on return. 1924 */ 1925 static void 1926 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 1927 struct mbuf *m) 1928 { 1929 struct bridge_iflist *dbif; 1930 struct ifnet *src_if, *dst_if, *ifp; 1931 struct ether_header *eh; 1932 uint16_t vlan; 1933 int error; 1934 1935 src_if = m->m_pkthdr.rcvif; 1936 ifp = sc->sc_ifp; 1937 1938 ifp->if_ipackets++; 1939 ifp->if_ibytes += m->m_pkthdr.len; 1940 vlan = VLANTAGOF(m); 1941 1942 if ((sbif->bif_flags & IFBIF_STP) && 1943 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 1944 goto drop; 1945 1946 eh = mtod(m, struct ether_header *); 1947 1948 /* If the interface is learning, record the address. */ 1949 if (sbif->bif_flags & IFBIF_LEARNING) { 1950 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 1951 sbif, 0, IFBAF_DYNAMIC); 1952 /* 1953 * If the interface has addresses limits then deny any source 1954 * that is not in the cache. 1955 */ 1956 if (error && sbif->bif_addrmax) 1957 goto drop; 1958 } 1959 1960 if ((sbif->bif_flags & IFBIF_STP) != 0 && 1961 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 1962 goto drop; 1963 1964 /* 1965 * At this point, the port either doesn't participate 1966 * in spanning tree or it is in the forwarding state. 1967 */ 1968 1969 /* 1970 * If the packet is unicast, destined for someone on 1971 * "this" side of the bridge, drop it. 1972 */ 1973 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 1974 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 1975 if (src_if == dst_if) 1976 goto drop; 1977 } else { 1978 /* ...forward it to all interfaces. */ 1979 ifp->if_imcasts++; 1980 dst_if = NULL; 1981 } 1982 1983 /* 1984 * If we have a destination interface which is a member of our bridge, 1985 * OR this is a unicast packet, push it through the bpf(4) machinery. 1986 * For broadcast or multicast packets, don't bother because it will 1987 * be reinjected into ether_input. We do this before we pass the packets 1988 * through the pfil(9) framework, as it is possible that pfil(9) will 1989 * drop the packet, or possibly modify it, making it difficult to debug 1990 * firewall issues on the bridge. 1991 */ 1992 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 1993 ETHER_BPF_MTAP(ifp, m); 1994 1995 /* run the packet filter */ 1996 if (PFIL_HOOKED(&inet_pfil_hook) 1997 #ifdef INET6 1998 || PFIL_HOOKED(&inet6_pfil_hook) 1999 #endif 2000 ) { 2001 BRIDGE_UNLOCK(sc); 2002 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2003 return; 2004 if (m == NULL) 2005 return; 2006 BRIDGE_LOCK(sc); 2007 } 2008 2009 if (dst_if == NULL) { 2010 bridge_broadcast(sc, src_if, m, 1); 2011 return; 2012 } 2013 2014 /* 2015 * At this point, we're dealing with a unicast frame 2016 * going to a different interface. 2017 */ 2018 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2019 goto drop; 2020 2021 dbif = bridge_lookup_member_if(sc, dst_if); 2022 if (dbif == NULL) 2023 /* Not a member of the bridge (anymore?) */ 2024 goto drop; 2025 2026 /* Private segments can not talk to each other */ 2027 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2028 goto drop; 2029 2030 if ((dbif->bif_flags & IFBIF_STP) && 2031 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2032 goto drop; 2033 2034 BRIDGE_UNLOCK(sc); 2035 2036 if (PFIL_HOOKED(&inet_pfil_hook) 2037 #ifdef INET6 2038 || PFIL_HOOKED(&inet6_pfil_hook) 2039 #endif 2040 ) { 2041 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2042 return; 2043 if (m == NULL) 2044 return; 2045 } 2046 2047 bridge_enqueue(sc, dst_if, m); 2048 return; 2049 2050 drop: 2051 BRIDGE_UNLOCK(sc); 2052 m_freem(m); 2053 } 2054 2055 /* 2056 * bridge_input: 2057 * 2058 * Receive input from a member interface. Queue the packet for 2059 * bridging if it is not for us. 2060 */ 2061 static struct mbuf * 2062 bridge_input(struct ifnet *ifp, struct mbuf *m) 2063 { 2064 struct bridge_softc *sc = ifp->if_bridge; 2065 struct bridge_iflist *bif, *bif2; 2066 struct ifnet *bifp; 2067 struct ether_header *eh; 2068 struct mbuf *mc, *mc2; 2069 uint16_t vlan; 2070 int error; 2071 2072 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2073 return (m); 2074 2075 bifp = sc->sc_ifp; 2076 vlan = VLANTAGOF(m); 2077 2078 /* 2079 * Implement support for bridge monitoring. If this flag has been 2080 * set on this interface, discard the packet once we push it through 2081 * the bpf(4) machinery, but before we do, increment the byte and 2082 * packet counters associated with this interface. 2083 */ 2084 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2085 m->m_pkthdr.rcvif = bifp; 2086 ETHER_BPF_MTAP(bifp, m); 2087 bifp->if_ipackets++; 2088 bifp->if_ibytes += m->m_pkthdr.len; 2089 m_freem(m); 2090 return (NULL); 2091 } 2092 BRIDGE_LOCK(sc); 2093 bif = bridge_lookup_member_if(sc, ifp); 2094 if (bif == NULL) { 2095 BRIDGE_UNLOCK(sc); 2096 return (m); 2097 } 2098 2099 eh = mtod(m, struct ether_header *); 2100 2101 if (memcmp(eh->ether_dhost, IF_LLADDR(bifp), 2102 ETHER_ADDR_LEN) == 0) { 2103 /* Block redundant paths to us */ 2104 if ((bif->bif_flags & IFBIF_STP) && 2105 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2106 BRIDGE_UNLOCK(sc); 2107 return (m); 2108 } 2109 2110 /* 2111 * Filter on the physical interface. 2112 */ 2113 if (pfil_local_phys && (PFIL_HOOKED(&inet_pfil_hook) 2114 #ifdef INET6 2115 || PFIL_HOOKED(&inet6_pfil_hook) 2116 #endif 2117 )) { 2118 if (bridge_pfil(&m, NULL, ifp, PFIL_IN) != 0 || 2119 m == NULL) { 2120 BRIDGE_UNLOCK(sc); 2121 return (NULL); 2122 } 2123 } 2124 2125 /* 2126 * If the packet is for us, set the packets source as the 2127 * bridge, and return the packet back to ether_input for 2128 * local processing. 2129 */ 2130 2131 /* Note where to send the reply to */ 2132 if (bif->bif_flags & IFBIF_LEARNING) { 2133 error = bridge_rtupdate(sc, 2134 eh->ether_shost, vlan, bif, 0, IFBAF_DYNAMIC); 2135 /* 2136 * If the interface has addresses limits then deny any 2137 * source that is not in the cache. 2138 */ 2139 if (error && bif->bif_addrmax) { 2140 BRIDGE_UNLOCK(sc); 2141 m_freem(m); 2142 return (NULL); 2143 } 2144 } 2145 2146 /* Mark the packet as arriving on the bridge interface */ 2147 m->m_pkthdr.rcvif = bifp; 2148 ETHER_BPF_MTAP(bifp, m); 2149 bifp->if_ipackets++; 2150 2151 BRIDGE_UNLOCK(sc); 2152 return (m); 2153 } 2154 2155 bridge_span(sc, m); 2156 2157 if (m->m_flags & (M_BCAST|M_MCAST)) { 2158 /* Tap off 802.1D packets; they do not get forwarded. */ 2159 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2160 ETHER_ADDR_LEN) == 0) { 2161 m = bstp_input(&bif->bif_stp, ifp, m); 2162 if (m == NULL) { 2163 BRIDGE_UNLOCK(sc); 2164 return (NULL); 2165 } 2166 } 2167 2168 if ((bif->bif_flags & IFBIF_STP) && 2169 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2170 BRIDGE_UNLOCK(sc); 2171 return (m); 2172 } 2173 2174 /* 2175 * Make a deep copy of the packet and enqueue the copy 2176 * for bridge processing; return the original packet for 2177 * local processing. 2178 */ 2179 mc = m_dup(m, M_DONTWAIT); 2180 if (mc == NULL) { 2181 BRIDGE_UNLOCK(sc); 2182 return (m); 2183 } 2184 2185 /* Perform the bridge forwarding function with the copy. */ 2186 bridge_forward(sc, bif, mc); 2187 2188 /* 2189 * Reinject the mbuf as arriving on the bridge so we have a 2190 * chance at claiming multicast packets. We can not loop back 2191 * here from ether_input as a bridge is never a member of a 2192 * bridge. 2193 */ 2194 KASSERT(bifp->if_bridge == NULL, 2195 ("loop created in bridge_input")); 2196 mc2 = m_dup(m, M_DONTWAIT); 2197 if (mc2 != NULL) { 2198 /* Keep the layer3 header aligned */ 2199 int i = min(mc2->m_pkthdr.len, max_protohdr); 2200 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2201 } 2202 if (mc2 != NULL) { 2203 mc2->m_pkthdr.rcvif = bifp; 2204 (*bifp->if_input)(bifp, mc2); 2205 } 2206 2207 /* Return the original packet for local processing. */ 2208 return (m); 2209 } 2210 2211 if ((bif->bif_flags & IFBIF_STP) && 2212 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2213 BRIDGE_UNLOCK(sc); 2214 return (m); 2215 } 2216 2217 #ifdef DEV_CARP 2218 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2219 || ((iface)->if_carp \ 2220 && carp_forus((iface)->if_carp, eh->ether_dhost)) 2221 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2222 || ((iface)->if_carp \ 2223 && carp_forus((iface)->if_carp, eh->ether_shost)) 2224 #else 2225 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2226 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2227 #endif 2228 2229 #define GRAB_OUR_PACKETS(iface) \ 2230 if ((iface)->if_type == IFT_GIF) \ 2231 continue; \ 2232 /* It is destined for us. */ \ 2233 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2234 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2235 ) { \ 2236 if (bif->bif_flags & IFBIF_LEARNING) { \ 2237 error = bridge_rtupdate(sc, eh->ether_shost, \ 2238 vlan, bif, 0, IFBAF_DYNAMIC); \ 2239 if (error && bif->bif_addrmax) { \ 2240 BRIDGE_UNLOCK(sc); \ 2241 m_freem(m); \ 2242 return (NULL); \ 2243 } \ 2244 } \ 2245 m->m_pkthdr.rcvif = iface; \ 2246 BRIDGE_UNLOCK(sc); \ 2247 return (m); \ 2248 } \ 2249 \ 2250 /* We just received a packet that we sent out. */ \ 2251 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2252 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2253 ) { \ 2254 BRIDGE_UNLOCK(sc); \ 2255 m_freem(m); \ 2256 return (NULL); \ 2257 } 2258 2259 /* 2260 * Unicast. Make sure it's not for us. 2261 * 2262 * Give a chance for ifp at first priority. This will help when the 2263 * packet comes through the interface like VLAN's with the same MACs 2264 * on several interfaces from the same bridge. This also will save 2265 * some CPU cycles in case the destination interface and the input 2266 * interface (eq ifp) are the same. 2267 */ 2268 do { GRAB_OUR_PACKETS(ifp) } while (0); 2269 2270 /* Now check the all bridge members. */ 2271 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2272 GRAB_OUR_PACKETS(bif2->bif_ifp) 2273 } 2274 2275 #undef OR_CARP_CHECK_WE_ARE_DST 2276 #undef OR_CARP_CHECK_WE_ARE_SRC 2277 #undef GRAB_OUR_PACKETS 2278 2279 /* Perform the bridge forwarding function. */ 2280 bridge_forward(sc, bif, m); 2281 2282 return (NULL); 2283 } 2284 2285 /* 2286 * bridge_broadcast: 2287 * 2288 * Send a frame to all interfaces that are members of 2289 * the bridge, except for the one on which the packet 2290 * arrived. 2291 * 2292 * NOTE: Releases the lock on return. 2293 */ 2294 static void 2295 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2296 struct mbuf *m, int runfilt) 2297 { 2298 struct bridge_iflist *dbif, *sbif; 2299 struct mbuf *mc; 2300 struct ifnet *dst_if; 2301 int error = 0, used = 0, i; 2302 2303 sbif = bridge_lookup_member_if(sc, src_if); 2304 2305 BRIDGE_LOCK2REF(sc, error); 2306 if (error) { 2307 m_freem(m); 2308 return; 2309 } 2310 2311 /* Filter on the bridge interface before broadcasting */ 2312 if (runfilt && (PFIL_HOOKED(&inet_pfil_hook) 2313 #ifdef INET6 2314 || PFIL_HOOKED(&inet6_pfil_hook) 2315 #endif 2316 )) { 2317 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2318 goto out; 2319 if (m == NULL) 2320 goto out; 2321 } 2322 2323 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2324 dst_if = dbif->bif_ifp; 2325 if (dst_if == src_if) 2326 continue; 2327 2328 /* Private segments can not talk to each other */ 2329 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2330 continue; 2331 2332 if ((dbif->bif_flags & IFBIF_STP) && 2333 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2334 continue; 2335 2336 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2337 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2338 continue; 2339 2340 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2341 continue; 2342 2343 if (LIST_NEXT(dbif, bif_next) == NULL) { 2344 mc = m; 2345 used = 1; 2346 } else { 2347 mc = m_dup(m, M_DONTWAIT); 2348 if (mc == NULL) { 2349 sc->sc_ifp->if_oerrors++; 2350 continue; 2351 } 2352 } 2353 2354 /* 2355 * Filter on the output interface. Pass a NULL bridge interface 2356 * pointer so we do not redundantly filter on the bridge for 2357 * each interface we broadcast on. 2358 */ 2359 if (runfilt && (PFIL_HOOKED(&inet_pfil_hook) 2360 #ifdef INET6 2361 || PFIL_HOOKED(&inet6_pfil_hook) 2362 #endif 2363 )) { 2364 if (used == 0) { 2365 /* Keep the layer3 header aligned */ 2366 i = min(mc->m_pkthdr.len, max_protohdr); 2367 mc = m_copyup(mc, i, ETHER_ALIGN); 2368 if (mc == NULL) { 2369 sc->sc_ifp->if_oerrors++; 2370 continue; 2371 } 2372 } 2373 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2374 continue; 2375 if (mc == NULL) 2376 continue; 2377 } 2378 2379 bridge_enqueue(sc, dst_if, mc); 2380 } 2381 if (used == 0) 2382 m_freem(m); 2383 2384 out: 2385 BRIDGE_UNREF(sc); 2386 } 2387 2388 /* 2389 * bridge_span: 2390 * 2391 * Duplicate a packet out one or more interfaces that are in span mode, 2392 * the original mbuf is unmodified. 2393 */ 2394 static void 2395 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2396 { 2397 struct bridge_iflist *bif; 2398 struct ifnet *dst_if; 2399 struct mbuf *mc; 2400 2401 if (LIST_EMPTY(&sc->sc_spanlist)) 2402 return; 2403 2404 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2405 dst_if = bif->bif_ifp; 2406 2407 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2408 continue; 2409 2410 mc = m_copypacket(m, M_DONTWAIT); 2411 if (mc == NULL) { 2412 sc->sc_ifp->if_oerrors++; 2413 continue; 2414 } 2415 2416 bridge_enqueue(sc, dst_if, mc); 2417 } 2418 } 2419 2420 /* 2421 * bridge_rtupdate: 2422 * 2423 * Add a bridge routing entry. 2424 */ 2425 static int 2426 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2427 struct bridge_iflist *bif, int setflags, uint8_t flags) 2428 { 2429 struct bridge_rtnode *brt; 2430 int error; 2431 2432 BRIDGE_LOCK_ASSERT(sc); 2433 2434 /* Check the source address is valid and not multicast. */ 2435 if (ETHER_IS_MULTICAST(dst) || 2436 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2437 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2438 return (EINVAL); 2439 2440 /* 802.1p frames map to vlan 1 */ 2441 if (vlan == 0) 2442 vlan = 1; 2443 2444 /* 2445 * A route for this destination might already exist. If so, 2446 * update it, otherwise create a new one. 2447 */ 2448 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2449 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2450 sc->sc_brtexceeded++; 2451 return (ENOSPC); 2452 } 2453 /* Check per interface address limits (if enabled) */ 2454 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2455 bif->bif_addrexceeded++; 2456 return (ENOSPC); 2457 } 2458 2459 /* 2460 * Allocate a new bridge forwarding node, and 2461 * initialize the expiration time and Ethernet 2462 * address. 2463 */ 2464 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2465 if (brt == NULL) 2466 return (ENOMEM); 2467 2468 if (bif->bif_flags & IFBIF_STICKY) 2469 brt->brt_flags = IFBAF_STICKY; 2470 else 2471 brt->brt_flags = IFBAF_DYNAMIC; 2472 2473 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2474 brt->brt_vlan = vlan; 2475 2476 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2477 uma_zfree(bridge_rtnode_zone, brt); 2478 return (error); 2479 } 2480 brt->brt_dst = bif; 2481 bif->bif_addrcnt++; 2482 } 2483 2484 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2485 brt->brt_dst != bif) { 2486 brt->brt_dst->bif_addrcnt--; 2487 brt->brt_dst = bif; 2488 brt->brt_dst->bif_addrcnt++; 2489 } 2490 2491 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2492 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2493 if (setflags) 2494 brt->brt_flags = flags; 2495 2496 return (0); 2497 } 2498 2499 /* 2500 * bridge_rtlookup: 2501 * 2502 * Lookup the destination interface for an address. 2503 */ 2504 static struct ifnet * 2505 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2506 { 2507 struct bridge_rtnode *brt; 2508 2509 BRIDGE_LOCK_ASSERT(sc); 2510 2511 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2512 return (NULL); 2513 2514 return (brt->brt_ifp); 2515 } 2516 2517 /* 2518 * bridge_rttrim: 2519 * 2520 * Trim the routine table so that we have a number 2521 * of routing entries less than or equal to the 2522 * maximum number. 2523 */ 2524 static void 2525 bridge_rttrim(struct bridge_softc *sc) 2526 { 2527 struct bridge_rtnode *brt, *nbrt; 2528 2529 BRIDGE_LOCK_ASSERT(sc); 2530 2531 /* Make sure we actually need to do this. */ 2532 if (sc->sc_brtcnt <= sc->sc_brtmax) 2533 return; 2534 2535 /* Force an aging cycle; this might trim enough addresses. */ 2536 bridge_rtage(sc); 2537 if (sc->sc_brtcnt <= sc->sc_brtmax) 2538 return; 2539 2540 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2541 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2542 bridge_rtnode_destroy(sc, brt); 2543 if (sc->sc_brtcnt <= sc->sc_brtmax) 2544 return; 2545 } 2546 } 2547 } 2548 2549 /* 2550 * bridge_timer: 2551 * 2552 * Aging timer for the bridge. 2553 */ 2554 static void 2555 bridge_timer(void *arg) 2556 { 2557 struct bridge_softc *sc = arg; 2558 2559 BRIDGE_LOCK_ASSERT(sc); 2560 2561 bridge_rtage(sc); 2562 2563 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2564 callout_reset(&sc->sc_brcallout, 2565 bridge_rtable_prune_period * hz, bridge_timer, sc); 2566 } 2567 2568 /* 2569 * bridge_rtage: 2570 * 2571 * Perform an aging cycle. 2572 */ 2573 static void 2574 bridge_rtage(struct bridge_softc *sc) 2575 { 2576 struct bridge_rtnode *brt, *nbrt; 2577 2578 BRIDGE_LOCK_ASSERT(sc); 2579 2580 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2581 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2582 if (time_uptime >= brt->brt_expire) 2583 bridge_rtnode_destroy(sc, brt); 2584 } 2585 } 2586 } 2587 2588 /* 2589 * bridge_rtflush: 2590 * 2591 * Remove all dynamic addresses from the bridge. 2592 */ 2593 static void 2594 bridge_rtflush(struct bridge_softc *sc, int full) 2595 { 2596 struct bridge_rtnode *brt, *nbrt; 2597 2598 BRIDGE_LOCK_ASSERT(sc); 2599 2600 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2601 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2602 bridge_rtnode_destroy(sc, brt); 2603 } 2604 } 2605 2606 /* 2607 * bridge_rtdaddr: 2608 * 2609 * Remove an address from the table. 2610 */ 2611 static int 2612 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2613 { 2614 struct bridge_rtnode *brt; 2615 int found = 0; 2616 2617 BRIDGE_LOCK_ASSERT(sc); 2618 2619 /* 2620 * If vlan is zero then we want to delete for all vlans so the lookup 2621 * may return more than one. 2622 */ 2623 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2624 bridge_rtnode_destroy(sc, brt); 2625 found = 1; 2626 } 2627 2628 return (found ? 0 : ENOENT); 2629 } 2630 2631 /* 2632 * bridge_rtdelete: 2633 * 2634 * Delete routes to a speicifc member interface. 2635 */ 2636 static void 2637 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2638 { 2639 struct bridge_rtnode *brt, *nbrt; 2640 2641 BRIDGE_LOCK_ASSERT(sc); 2642 2643 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2644 if (brt->brt_ifp == ifp && (full || 2645 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2646 bridge_rtnode_destroy(sc, brt); 2647 } 2648 } 2649 2650 /* 2651 * bridge_rtable_init: 2652 * 2653 * Initialize the route table for this bridge. 2654 */ 2655 static int 2656 bridge_rtable_init(struct bridge_softc *sc) 2657 { 2658 int i; 2659 2660 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2661 M_DEVBUF, M_NOWAIT); 2662 if (sc->sc_rthash == NULL) 2663 return (ENOMEM); 2664 2665 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2666 LIST_INIT(&sc->sc_rthash[i]); 2667 2668 sc->sc_rthash_key = arc4random(); 2669 2670 LIST_INIT(&sc->sc_rtlist); 2671 2672 return (0); 2673 } 2674 2675 /* 2676 * bridge_rtable_fini: 2677 * 2678 * Deconstruct the route table for this bridge. 2679 */ 2680 static void 2681 bridge_rtable_fini(struct bridge_softc *sc) 2682 { 2683 2684 KASSERT(sc->sc_brtcnt == 0, 2685 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2686 free(sc->sc_rthash, M_DEVBUF); 2687 } 2688 2689 /* 2690 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2691 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2692 */ 2693 #define mix(a, b, c) \ 2694 do { \ 2695 a -= b; a -= c; a ^= (c >> 13); \ 2696 b -= c; b -= a; b ^= (a << 8); \ 2697 c -= a; c -= b; c ^= (b >> 13); \ 2698 a -= b; a -= c; a ^= (c >> 12); \ 2699 b -= c; b -= a; b ^= (a << 16); \ 2700 c -= a; c -= b; c ^= (b >> 5); \ 2701 a -= b; a -= c; a ^= (c >> 3); \ 2702 b -= c; b -= a; b ^= (a << 10); \ 2703 c -= a; c -= b; c ^= (b >> 15); \ 2704 } while (/*CONSTCOND*/0) 2705 2706 static __inline uint32_t 2707 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2708 { 2709 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2710 2711 b += addr[5] << 8; 2712 b += addr[4]; 2713 a += addr[3] << 24; 2714 a += addr[2] << 16; 2715 a += addr[1] << 8; 2716 a += addr[0]; 2717 2718 mix(a, b, c); 2719 2720 return (c & BRIDGE_RTHASH_MASK); 2721 } 2722 2723 #undef mix 2724 2725 static int 2726 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2727 { 2728 int i, d; 2729 2730 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2731 d = ((int)a[i]) - ((int)b[i]); 2732 } 2733 2734 return (d); 2735 } 2736 2737 /* 2738 * bridge_rtnode_lookup: 2739 * 2740 * Look up a bridge route node for the specified destination. Compare the 2741 * vlan id or if zero then just return the first match. 2742 */ 2743 static struct bridge_rtnode * 2744 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2745 { 2746 struct bridge_rtnode *brt; 2747 uint32_t hash; 2748 int dir; 2749 2750 BRIDGE_LOCK_ASSERT(sc); 2751 2752 hash = bridge_rthash(sc, addr); 2753 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2754 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2755 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2756 return (brt); 2757 if (dir > 0) 2758 return (NULL); 2759 } 2760 2761 return (NULL); 2762 } 2763 2764 /* 2765 * bridge_rtnode_insert: 2766 * 2767 * Insert the specified bridge node into the route table. We 2768 * assume the entry is not already in the table. 2769 */ 2770 static int 2771 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2772 { 2773 struct bridge_rtnode *lbrt; 2774 uint32_t hash; 2775 int dir; 2776 2777 BRIDGE_LOCK_ASSERT(sc); 2778 2779 hash = bridge_rthash(sc, brt->brt_addr); 2780 2781 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2782 if (lbrt == NULL) { 2783 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2784 goto out; 2785 } 2786 2787 do { 2788 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2789 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2790 return (EEXIST); 2791 if (dir > 0) { 2792 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2793 goto out; 2794 } 2795 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2796 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2797 goto out; 2798 } 2799 lbrt = LIST_NEXT(lbrt, brt_hash); 2800 } while (lbrt != NULL); 2801 2802 #ifdef DIAGNOSTIC 2803 panic("bridge_rtnode_insert: impossible"); 2804 #endif 2805 2806 out: 2807 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2808 sc->sc_brtcnt++; 2809 2810 return (0); 2811 } 2812 2813 /* 2814 * bridge_rtnode_destroy: 2815 * 2816 * Destroy a bridge rtnode. 2817 */ 2818 static void 2819 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2820 { 2821 BRIDGE_LOCK_ASSERT(sc); 2822 2823 LIST_REMOVE(brt, brt_hash); 2824 2825 LIST_REMOVE(brt, brt_list); 2826 sc->sc_brtcnt--; 2827 brt->brt_dst->bif_addrcnt--; 2828 uma_zfree(bridge_rtnode_zone, brt); 2829 } 2830 2831 /* 2832 * bridge_rtable_expire: 2833 * 2834 * Set the expiry time for all routes on an interface. 2835 */ 2836 static void 2837 bridge_rtable_expire(struct ifnet *ifp, int age) 2838 { 2839 struct bridge_softc *sc = ifp->if_bridge; 2840 struct bridge_rtnode *brt; 2841 2842 BRIDGE_LOCK(sc); 2843 2844 /* 2845 * If the age is zero then flush, otherwise set all the expiry times to 2846 * age for the interface 2847 */ 2848 if (age == 0) 2849 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 2850 else { 2851 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2852 /* Cap the expiry time to 'age' */ 2853 if (brt->brt_ifp == ifp && 2854 brt->brt_expire > time_uptime + age && 2855 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2856 brt->brt_expire = time_uptime + age; 2857 } 2858 } 2859 BRIDGE_UNLOCK(sc); 2860 } 2861 2862 /* 2863 * bridge_state_change: 2864 * 2865 * Callback from the bridgestp code when a port changes states. 2866 */ 2867 static void 2868 bridge_state_change(struct ifnet *ifp, int state) 2869 { 2870 struct bridge_softc *sc = ifp->if_bridge; 2871 static const char *stpstates[] = { 2872 "disabled", 2873 "listening", 2874 "learning", 2875 "forwarding", 2876 "blocking", 2877 "discarding" 2878 }; 2879 2880 if (log_stp) 2881 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 2882 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 2883 } 2884 2885 /* 2886 * Send bridge packets through pfil if they are one of the types pfil can deal 2887 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 2888 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 2889 * that interface. 2890 */ 2891 static int 2892 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 2893 { 2894 int snap, error, i, hlen; 2895 struct ether_header *eh1, eh2; 2896 struct ip_fw_args args; 2897 struct ip *ip; 2898 struct llc llc1; 2899 u_int16_t ether_type; 2900 2901 snap = 0; 2902 error = -1; /* Default error if not error == 0 */ 2903 2904 #if 0 2905 /* we may return with the IP fields swapped, ensure its not shared */ 2906 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 2907 #endif 2908 2909 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) 2910 return (0); /* filtering is disabled */ 2911 2912 i = min((*mp)->m_pkthdr.len, max_protohdr); 2913 if ((*mp)->m_len < i) { 2914 *mp = m_pullup(*mp, i); 2915 if (*mp == NULL) { 2916 printf("%s: m_pullup failed\n", __func__); 2917 return (-1); 2918 } 2919 } 2920 2921 eh1 = mtod(*mp, struct ether_header *); 2922 ether_type = ntohs(eh1->ether_type); 2923 2924 /* 2925 * Check for SNAP/LLC. 2926 */ 2927 if (ether_type < ETHERMTU) { 2928 struct llc *llc2 = (struct llc *)(eh1 + 1); 2929 2930 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 2931 llc2->llc_dsap == LLC_SNAP_LSAP && 2932 llc2->llc_ssap == LLC_SNAP_LSAP && 2933 llc2->llc_control == LLC_UI) { 2934 ether_type = htons(llc2->llc_un.type_snap.ether_type); 2935 snap = 1; 2936 } 2937 } 2938 2939 /* 2940 * If we're trying to filter bridge traffic, don't look at anything 2941 * other than IP and ARP traffic. If the filter doesn't understand 2942 * IPv6, don't allow IPv6 through the bridge either. This is lame 2943 * since if we really wanted, say, an AppleTalk filter, we are hosed, 2944 * but of course we don't have an AppleTalk filter to begin with. 2945 * (Note that since pfil doesn't understand ARP it will pass *ALL* 2946 * ARP traffic.) 2947 */ 2948 switch (ether_type) { 2949 case ETHERTYPE_ARP: 2950 case ETHERTYPE_REVARP: 2951 if (pfil_ipfw_arp == 0) 2952 return (0); /* Automatically pass */ 2953 break; 2954 2955 case ETHERTYPE_IP: 2956 #ifdef INET6 2957 case ETHERTYPE_IPV6: 2958 #endif /* INET6 */ 2959 break; 2960 default: 2961 /* 2962 * Check to see if the user wants to pass non-ip 2963 * packets, these will not be checked by pfil(9) and 2964 * passed unconditionally so the default is to drop. 2965 */ 2966 if (pfil_onlyip) 2967 goto bad; 2968 } 2969 2970 /* Strip off the Ethernet header and keep a copy. */ 2971 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 2972 m_adj(*mp, ETHER_HDR_LEN); 2973 2974 /* Strip off snap header, if present */ 2975 if (snap) { 2976 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 2977 m_adj(*mp, sizeof(struct llc)); 2978 } 2979 2980 /* 2981 * Check the IP header for alignment and errors 2982 */ 2983 if (dir == PFIL_IN) { 2984 switch (ether_type) { 2985 case ETHERTYPE_IP: 2986 error = bridge_ip_checkbasic(mp); 2987 break; 2988 #ifdef INET6 2989 case ETHERTYPE_IPV6: 2990 error = bridge_ip6_checkbasic(mp); 2991 break; 2992 #endif /* INET6 */ 2993 default: 2994 error = 0; 2995 } 2996 if (error) 2997 goto bad; 2998 } 2999 3000 if (IPFW_LOADED && pfil_ipfw != 0 && dir == PFIL_OUT && ifp != NULL) { 3001 error = -1; 3002 args.rule = ip_dn_claim_rule(*mp); 3003 if (args.rule != NULL && fw_one_pass) 3004 goto ipfwpass; /* packet already partially processed */ 3005 3006 args.m = *mp; 3007 args.oif = ifp; 3008 args.next_hop = NULL; 3009 args.eh = &eh2; 3010 args.inp = NULL; /* used by ipfw uid/gid/jail rules */ 3011 i = ip_fw_chk_ptr(&args); 3012 *mp = args.m; 3013 3014 if (*mp == NULL) 3015 return (error); 3016 3017 if (DUMMYNET_LOADED && (i == IP_FW_DUMMYNET)) { 3018 3019 /* put the Ethernet header back on */ 3020 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3021 if (*mp == NULL) 3022 return (error); 3023 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3024 3025 /* 3026 * Pass the pkt to dummynet, which consumes it. The 3027 * packet will return to us via bridge_dummynet(). 3028 */ 3029 args.oif = ifp; 3030 ip_dn_io_ptr(mp, DN_TO_IFB_FWD, &args); 3031 return (error); 3032 } 3033 3034 if (i != IP_FW_PASS) /* drop */ 3035 goto bad; 3036 } 3037 3038 ipfwpass: 3039 error = 0; 3040 3041 /* 3042 * Run the packet through pfil 3043 */ 3044 switch (ether_type) { 3045 case ETHERTYPE_IP: 3046 /* 3047 * before calling the firewall, swap fields the same as 3048 * IP does. here we assume the header is contiguous 3049 */ 3050 ip = mtod(*mp, struct ip *); 3051 3052 ip->ip_len = ntohs(ip->ip_len); 3053 ip->ip_off = ntohs(ip->ip_off); 3054 3055 /* 3056 * Run pfil on the member interface and the bridge, both can 3057 * be skipped by clearing pfil_member or pfil_bridge. 3058 * 3059 * Keep the order: 3060 * in_if -> bridge_if -> out_if 3061 */ 3062 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3063 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, 3064 dir, NULL); 3065 3066 if (*mp == NULL || error != 0) /* filter may consume */ 3067 break; 3068 3069 if (pfil_member && ifp != NULL) 3070 error = pfil_run_hooks(&inet_pfil_hook, mp, ifp, 3071 dir, NULL); 3072 3073 if (*mp == NULL || error != 0) /* filter may consume */ 3074 break; 3075 3076 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3077 error = pfil_run_hooks(&inet_pfil_hook, mp, bifp, 3078 dir, NULL); 3079 3080 if (*mp == NULL || error != 0) /* filter may consume */ 3081 break; 3082 3083 /* check if we need to fragment the packet */ 3084 if (pfil_member && ifp != NULL && dir == PFIL_OUT) { 3085 i = (*mp)->m_pkthdr.len; 3086 if (i > ifp->if_mtu) { 3087 error = bridge_fragment(ifp, *mp, &eh2, snap, 3088 &llc1); 3089 return (error); 3090 } 3091 } 3092 3093 /* Recalculate the ip checksum and restore byte ordering */ 3094 ip = mtod(*mp, struct ip *); 3095 hlen = ip->ip_hl << 2; 3096 if (hlen < sizeof(struct ip)) 3097 goto bad; 3098 if (hlen > (*mp)->m_len) { 3099 if ((*mp = m_pullup(*mp, hlen)) == 0) 3100 goto bad; 3101 ip = mtod(*mp, struct ip *); 3102 if (ip == NULL) 3103 goto bad; 3104 } 3105 ip->ip_len = htons(ip->ip_len); 3106 ip->ip_off = htons(ip->ip_off); 3107 ip->ip_sum = 0; 3108 if (hlen == sizeof(struct ip)) 3109 ip->ip_sum = in_cksum_hdr(ip); 3110 else 3111 ip->ip_sum = in_cksum(*mp, hlen); 3112 3113 break; 3114 #ifdef INET6 3115 case ETHERTYPE_IPV6: 3116 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3117 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, 3118 dir, NULL); 3119 3120 if (*mp == NULL || error != 0) /* filter may consume */ 3121 break; 3122 3123 if (pfil_member && ifp != NULL) 3124 error = pfil_run_hooks(&inet6_pfil_hook, mp, ifp, 3125 dir, NULL); 3126 3127 if (*mp == NULL || error != 0) /* filter may consume */ 3128 break; 3129 3130 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3131 error = pfil_run_hooks(&inet6_pfil_hook, mp, bifp, 3132 dir, NULL); 3133 break; 3134 #endif 3135 default: 3136 error = 0; 3137 break; 3138 } 3139 3140 if (*mp == NULL) 3141 return (error); 3142 if (error != 0) 3143 goto bad; 3144 3145 error = -1; 3146 3147 /* 3148 * Finally, put everything back the way it was and return 3149 */ 3150 if (snap) { 3151 M_PREPEND(*mp, sizeof(struct llc), M_DONTWAIT); 3152 if (*mp == NULL) 3153 return (error); 3154 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3155 } 3156 3157 M_PREPEND(*mp, ETHER_HDR_LEN, M_DONTWAIT); 3158 if (*mp == NULL) 3159 return (error); 3160 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3161 3162 return (0); 3163 3164 bad: 3165 m_freem(*mp); 3166 *mp = NULL; 3167 return (error); 3168 } 3169 3170 /* 3171 * Perform basic checks on header size since 3172 * pfil assumes ip_input has already processed 3173 * it for it. Cut-and-pasted from ip_input.c. 3174 * Given how simple the IPv6 version is, 3175 * does the IPv4 version really need to be 3176 * this complicated? 3177 * 3178 * XXX Should we update ipstat here, or not? 3179 * XXX Right now we update ipstat but not 3180 * XXX csum_counter. 3181 */ 3182 static int 3183 bridge_ip_checkbasic(struct mbuf **mp) 3184 { 3185 struct mbuf *m = *mp; 3186 struct ip *ip; 3187 int len, hlen; 3188 u_short sum; 3189 3190 if (*mp == NULL) 3191 return (-1); 3192 3193 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3194 if ((m = m_copyup(m, sizeof(struct ip), 3195 (max_linkhdr + 3) & ~3)) == NULL) { 3196 /* XXXJRT new stat, please */ 3197 ipstat.ips_toosmall++; 3198 goto bad; 3199 } 3200 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3201 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3202 ipstat.ips_toosmall++; 3203 goto bad; 3204 } 3205 } 3206 ip = mtod(m, struct ip *); 3207 if (ip == NULL) goto bad; 3208 3209 if (ip->ip_v != IPVERSION) { 3210 ipstat.ips_badvers++; 3211 goto bad; 3212 } 3213 hlen = ip->ip_hl << 2; 3214 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3215 ipstat.ips_badhlen++; 3216 goto bad; 3217 } 3218 if (hlen > m->m_len) { 3219 if ((m = m_pullup(m, hlen)) == 0) { 3220 ipstat.ips_badhlen++; 3221 goto bad; 3222 } 3223 ip = mtod(m, struct ip *); 3224 if (ip == NULL) goto bad; 3225 } 3226 3227 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3228 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3229 } else { 3230 if (hlen == sizeof(struct ip)) { 3231 sum = in_cksum_hdr(ip); 3232 } else { 3233 sum = in_cksum(m, hlen); 3234 } 3235 } 3236 if (sum) { 3237 ipstat.ips_badsum++; 3238 goto bad; 3239 } 3240 3241 /* Retrieve the packet length. */ 3242 len = ntohs(ip->ip_len); 3243 3244 /* 3245 * Check for additional length bogosity 3246 */ 3247 if (len < hlen) { 3248 ipstat.ips_badlen++; 3249 goto bad; 3250 } 3251 3252 /* 3253 * Check that the amount of data in the buffers 3254 * is as at least much as the IP header would have us expect. 3255 * Drop packet if shorter than we expect. 3256 */ 3257 if (m->m_pkthdr.len < len) { 3258 ipstat.ips_tooshort++; 3259 goto bad; 3260 } 3261 3262 /* Checks out, proceed */ 3263 *mp = m; 3264 return (0); 3265 3266 bad: 3267 *mp = m; 3268 return (-1); 3269 } 3270 3271 #ifdef INET6 3272 /* 3273 * Same as above, but for IPv6. 3274 * Cut-and-pasted from ip6_input.c. 3275 * XXX Should we update ip6stat, or not? 3276 */ 3277 static int 3278 bridge_ip6_checkbasic(struct mbuf **mp) 3279 { 3280 struct mbuf *m = *mp; 3281 struct ip6_hdr *ip6; 3282 3283 /* 3284 * If the IPv6 header is not aligned, slurp it up into a new 3285 * mbuf with space for link headers, in the event we forward 3286 * it. Otherwise, if it is aligned, make sure the entire base 3287 * IPv6 header is in the first mbuf of the chain. 3288 */ 3289 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3290 struct ifnet *inifp = m->m_pkthdr.rcvif; 3291 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3292 (max_linkhdr + 3) & ~3)) == NULL) { 3293 /* XXXJRT new stat, please */ 3294 ip6stat.ip6s_toosmall++; 3295 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3296 goto bad; 3297 } 3298 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3299 struct ifnet *inifp = m->m_pkthdr.rcvif; 3300 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3301 ip6stat.ip6s_toosmall++; 3302 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3303 goto bad; 3304 } 3305 } 3306 3307 ip6 = mtod(m, struct ip6_hdr *); 3308 3309 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3310 ip6stat.ip6s_badvers++; 3311 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3312 goto bad; 3313 } 3314 3315 /* Checks out, proceed */ 3316 *mp = m; 3317 return (0); 3318 3319 bad: 3320 *mp = m; 3321 return (-1); 3322 } 3323 #endif /* INET6 */ 3324 3325 /* 3326 * bridge_fragment: 3327 * 3328 * Return a fragmented mbuf chain. 3329 */ 3330 static int 3331 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, 3332 int snap, struct llc *llc) 3333 { 3334 struct mbuf *m0; 3335 struct ip *ip; 3336 int error = -1; 3337 3338 if (m->m_len < sizeof(struct ip) && 3339 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3340 goto out; 3341 ip = mtod(m, struct ip *); 3342 3343 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist, 3344 CSUM_DELAY_IP); 3345 if (error) 3346 goto out; 3347 3348 /* walk the chain and re-add the Ethernet header */ 3349 for (m0 = m; m0; m0 = m0->m_nextpkt) { 3350 if (error == 0) { 3351 if (snap) { 3352 M_PREPEND(m0, sizeof(struct llc), M_DONTWAIT); 3353 if (m0 == NULL) { 3354 error = ENOBUFS; 3355 continue; 3356 } 3357 bcopy(llc, mtod(m0, caddr_t), 3358 sizeof(struct llc)); 3359 } 3360 M_PREPEND(m0, ETHER_HDR_LEN, M_DONTWAIT); 3361 if (m0 == NULL) { 3362 error = ENOBUFS; 3363 continue; 3364 } 3365 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); 3366 } else 3367 m_freem(m); 3368 } 3369 3370 if (error == 0) 3371 ipstat.ips_fragmented++; 3372 3373 return (error); 3374 3375 out: 3376 if (m != NULL) 3377 m_freem(m); 3378 return (error); 3379 } 3380