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 * 51 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 52 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 53 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 54 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 55 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 56 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 57 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 59 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 60 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 61 * POSSIBILITY OF SUCH DAMAGE. 62 * 63 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 64 */ 65 66 /* 67 * Network interface bridge support. 68 * 69 * TODO: 70 * 71 * - Currently only supports Ethernet-like interfaces (Ethernet, 72 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 73 * to bridge other types of interfaces (FDDI-FDDI, and maybe 74 * consider heterogenous bridges). 75 */ 76 77 #include <sys/cdefs.h> 78 __FBSDID("$FreeBSD$"); 79 80 #include "opt_inet.h" 81 #include "opt_inet6.h" 82 83 #include <sys/param.h> 84 #include <sys/eventhandler.h> 85 #include <sys/mbuf.h> 86 #include <sys/malloc.h> 87 #include <sys/protosw.h> 88 #include <sys/systm.h> 89 #include <sys/jail.h> 90 #include <sys/time.h> 91 #include <sys/socket.h> /* for net/if.h */ 92 #include <sys/sockio.h> 93 #include <sys/ctype.h> /* string functions */ 94 #include <sys/kernel.h> 95 #include <sys/random.h> 96 #include <sys/syslog.h> 97 #include <sys/sysctl.h> 98 #include <vm/uma.h> 99 #include <sys/module.h> 100 #include <sys/priv.h> 101 #include <sys/proc.h> 102 #include <sys/lock.h> 103 #include <sys/mutex.h> 104 105 #include <net/bpf.h> 106 #include <net/if.h> 107 #include <net/if_clone.h> 108 #include <net/if_dl.h> 109 #include <net/if_types.h> 110 #include <net/if_var.h> 111 #include <net/pfil.h> 112 #include <net/vnet.h> 113 114 #include <netinet/in.h> /* for struct arpcom */ 115 #include <netinet/in_systm.h> 116 #include <netinet/in_var.h> 117 #include <netinet/ip.h> 118 #include <netinet/ip_var.h> 119 #ifdef INET6 120 #include <netinet/ip6.h> 121 #include <netinet6/ip6_var.h> 122 #include <netinet6/in6_ifattach.h> 123 #endif 124 #if defined(INET) || defined(INET6) 125 #include <netinet/ip_carp.h> 126 #endif 127 #include <machine/in_cksum.h> 128 #include <netinet/if_ether.h> /* for struct arpcom */ 129 #include <net/bridgestp.h> 130 #include <net/if_bridgevar.h> 131 #include <net/if_llc.h> 132 #include <net/if_vlan_var.h> 133 134 #include <net/route.h> 135 136 /* 137 * Size of the route hash table. Must be a power of two. 138 */ 139 #ifndef BRIDGE_RTHASH_SIZE 140 #define BRIDGE_RTHASH_SIZE 1024 141 #endif 142 143 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 144 145 /* 146 * Default maximum number of addresses to cache. 147 */ 148 #ifndef BRIDGE_RTABLE_MAX 149 #define BRIDGE_RTABLE_MAX 2000 150 #endif 151 152 /* 153 * Timeout (in seconds) for entries learned dynamically. 154 */ 155 #ifndef BRIDGE_RTABLE_TIMEOUT 156 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 157 #endif 158 159 /* 160 * Number of seconds between walks of the route list. 161 */ 162 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 163 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 164 #endif 165 166 /* 167 * List of capabilities to possibly mask on the member interface. 168 */ 169 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM) 170 171 /* 172 * List of capabilities to strip 173 */ 174 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 175 176 /* 177 * Bridge interface list entry. 178 */ 179 struct bridge_iflist { 180 LIST_ENTRY(bridge_iflist) bif_next; 181 struct ifnet *bif_ifp; /* member if */ 182 struct bstp_port bif_stp; /* STP state */ 183 uint32_t bif_flags; /* member if flags */ 184 int bif_savedcaps; /* saved capabilities */ 185 uint32_t bif_addrmax; /* max # of addresses */ 186 uint32_t bif_addrcnt; /* cur. # of addresses */ 187 uint32_t bif_addrexceeded;/* # of address violations */ 188 }; 189 190 /* 191 * Bridge route node. 192 */ 193 struct bridge_rtnode { 194 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 195 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 196 struct bridge_iflist *brt_dst; /* destination if */ 197 unsigned long brt_expire; /* expiration time */ 198 uint8_t brt_flags; /* address flags */ 199 uint8_t brt_addr[ETHER_ADDR_LEN]; 200 uint16_t brt_vlan; /* vlan id */ 201 }; 202 #define brt_ifp brt_dst->bif_ifp 203 204 /* 205 * Software state for each bridge. 206 */ 207 struct bridge_softc { 208 struct ifnet *sc_ifp; /* make this an interface */ 209 LIST_ENTRY(bridge_softc) sc_list; 210 struct mtx sc_mtx; 211 struct cv sc_cv; 212 uint32_t sc_brtmax; /* max # of addresses */ 213 uint32_t sc_brtcnt; /* cur. # of addresses */ 214 uint32_t sc_brttimeout; /* rt timeout in seconds */ 215 struct callout sc_brcallout; /* bridge callout */ 216 uint32_t sc_iflist_ref; /* refcount for sc_iflist */ 217 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ 218 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 219 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 220 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 221 uint32_t sc_rthash_key; /* key for hash */ 222 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 223 struct bstp_state sc_stp; /* STP state */ 224 uint32_t sc_brtexceeded; /* # of cache drops */ 225 struct ifnet *sc_ifaddr; /* member mac copied from */ 226 u_char sc_defaddr[6]; /* Default MAC address */ 227 }; 228 229 static struct mtx bridge_list_mtx; 230 eventhandler_tag bridge_detach_cookie = NULL; 231 232 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 233 234 uma_zone_t bridge_rtnode_zone; 235 236 static int bridge_clone_create(struct if_clone *, int, caddr_t); 237 static void bridge_clone_destroy(struct ifnet *); 238 239 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 240 static void bridge_mutecaps(struct bridge_softc *); 241 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 242 int); 243 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 244 static void bridge_init(void *); 245 static void bridge_dummynet(struct mbuf *, struct ifnet *); 246 static void bridge_stop(struct ifnet *, int); 247 static int bridge_transmit(struct ifnet *, struct mbuf *); 248 static void bridge_qflush(struct ifnet *); 249 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 250 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 251 struct rtentry *); 252 static int bridge_enqueue(struct bridge_softc *, struct ifnet *, 253 struct mbuf *); 254 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 255 256 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 257 struct mbuf *m); 258 259 static void bridge_timer(void *); 260 261 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 262 struct mbuf *, int); 263 static void bridge_span(struct bridge_softc *, struct mbuf *); 264 265 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 266 uint16_t, struct bridge_iflist *, int, uint8_t); 267 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 268 uint16_t); 269 static void bridge_rttrim(struct bridge_softc *); 270 static void bridge_rtage(struct bridge_softc *); 271 static void bridge_rtflush(struct bridge_softc *, int); 272 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 273 uint16_t); 274 275 static void bridge_rtable_init(struct bridge_softc *); 276 static void bridge_rtable_fini(struct bridge_softc *); 277 278 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 279 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 280 const uint8_t *, uint16_t); 281 static int bridge_rtnode_insert(struct bridge_softc *, 282 struct bridge_rtnode *); 283 static void bridge_rtnode_destroy(struct bridge_softc *, 284 struct bridge_rtnode *); 285 static void bridge_rtable_expire(struct ifnet *, int); 286 static void bridge_state_change(struct ifnet *, int); 287 288 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 289 const char *name); 290 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 291 struct ifnet *ifp); 292 static void bridge_delete_member(struct bridge_softc *, 293 struct bridge_iflist *, int); 294 static void bridge_delete_span(struct bridge_softc *, 295 struct bridge_iflist *); 296 297 static int bridge_ioctl_add(struct bridge_softc *, void *); 298 static int bridge_ioctl_del(struct bridge_softc *, void *); 299 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 300 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 301 static int bridge_ioctl_scache(struct bridge_softc *, void *); 302 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 303 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 304 static int bridge_ioctl_rts(struct bridge_softc *, void *); 305 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 306 static int bridge_ioctl_sto(struct bridge_softc *, void *); 307 static int bridge_ioctl_gto(struct bridge_softc *, void *); 308 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 309 static int bridge_ioctl_flush(struct bridge_softc *, void *); 310 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 311 static int bridge_ioctl_spri(struct bridge_softc *, void *); 312 static int bridge_ioctl_ght(struct bridge_softc *, void *); 313 static int bridge_ioctl_sht(struct bridge_softc *, void *); 314 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 315 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 316 static int bridge_ioctl_gma(struct bridge_softc *, void *); 317 static int bridge_ioctl_sma(struct bridge_softc *, void *); 318 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 319 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 320 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 321 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 322 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 323 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 324 static int bridge_ioctl_grte(struct bridge_softc *, void *); 325 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 326 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 327 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 328 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 329 int); 330 static int bridge_ip_checkbasic(struct mbuf **mp); 331 #ifdef INET6 332 static int bridge_ip6_checkbasic(struct mbuf **mp); 333 #endif /* INET6 */ 334 static int bridge_fragment(struct ifnet *, struct mbuf *, 335 struct ether_header *, int, struct llc *); 336 static void bridge_linkstate(struct ifnet *ifp); 337 static void bridge_linkcheck(struct bridge_softc *sc); 338 339 extern void (*bridge_linkstate_p)(struct ifnet *ifp); 340 341 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 342 #define VLANTAGOF(_m) \ 343 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 344 345 static struct bstp_cb_ops bridge_ops = { 346 .bcb_state = bridge_state_change, 347 .bcb_rtage = bridge_rtable_expire 348 }; 349 350 SYSCTL_DECL(_net_link); 351 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 352 353 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */ 354 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */ 355 static int pfil_member = 1; /* run pfil hooks on the member interface */ 356 static int pfil_ipfw = 0; /* layer2 filter with ipfw */ 357 static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */ 358 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for 359 locally destined packets */ 360 static int log_stp = 0; /* log STP state changes */ 361 static int bridge_inherit_mac = 0; /* share MAC with first bridge member */ 362 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RWTUN, 363 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled"); 364 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RWTUN, 365 &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2"); 366 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RWTUN, 367 &pfil_bridge, 0, "Packet filter on the bridge interface"); 368 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RWTUN, 369 &pfil_member, 0, "Packet filter on the member interface"); 370 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RWTUN, 371 &pfil_local_phys, 0, 372 "Packet filter on the physical interface for locally destined packets"); 373 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RWTUN, 374 &log_stp, 0, "Log STP state changes"); 375 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RWTUN, 376 &bridge_inherit_mac, 0, 377 "Inherit MAC address from the first bridge member"); 378 379 static VNET_DEFINE(int, allow_llz_overlap) = 0; 380 #define V_allow_llz_overlap VNET(allow_llz_overlap) 381 SYSCTL_VNET_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, CTLFLAG_RW, 382 &VNET_NAME(allow_llz_overlap), 0, "Allow overlap of link-local scope " 383 "zones of a bridge interface and the member interfaces"); 384 385 struct bridge_control { 386 int (*bc_func)(struct bridge_softc *, void *); 387 int bc_argsize; 388 int bc_flags; 389 }; 390 391 #define BC_F_COPYIN 0x01 /* copy arguments in */ 392 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 393 #define BC_F_SUSER 0x04 /* do super-user check */ 394 395 const struct bridge_control bridge_control_table[] = { 396 { bridge_ioctl_add, sizeof(struct ifbreq), 397 BC_F_COPYIN|BC_F_SUSER }, 398 { bridge_ioctl_del, sizeof(struct ifbreq), 399 BC_F_COPYIN|BC_F_SUSER }, 400 401 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 402 BC_F_COPYIN|BC_F_COPYOUT }, 403 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 404 BC_F_COPYIN|BC_F_SUSER }, 405 406 { bridge_ioctl_scache, sizeof(struct ifbrparam), 407 BC_F_COPYIN|BC_F_SUSER }, 408 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 409 BC_F_COPYOUT }, 410 411 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 412 BC_F_COPYIN|BC_F_COPYOUT }, 413 { bridge_ioctl_rts, sizeof(struct ifbaconf), 414 BC_F_COPYIN|BC_F_COPYOUT }, 415 416 { bridge_ioctl_saddr, sizeof(struct ifbareq), 417 BC_F_COPYIN|BC_F_SUSER }, 418 419 { bridge_ioctl_sto, sizeof(struct ifbrparam), 420 BC_F_COPYIN|BC_F_SUSER }, 421 { bridge_ioctl_gto, sizeof(struct ifbrparam), 422 BC_F_COPYOUT }, 423 424 { bridge_ioctl_daddr, sizeof(struct ifbareq), 425 BC_F_COPYIN|BC_F_SUSER }, 426 427 { bridge_ioctl_flush, sizeof(struct ifbreq), 428 BC_F_COPYIN|BC_F_SUSER }, 429 430 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 431 BC_F_COPYOUT }, 432 { bridge_ioctl_spri, sizeof(struct ifbrparam), 433 BC_F_COPYIN|BC_F_SUSER }, 434 435 { bridge_ioctl_ght, sizeof(struct ifbrparam), 436 BC_F_COPYOUT }, 437 { bridge_ioctl_sht, sizeof(struct ifbrparam), 438 BC_F_COPYIN|BC_F_SUSER }, 439 440 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 441 BC_F_COPYOUT }, 442 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 443 BC_F_COPYIN|BC_F_SUSER }, 444 445 { bridge_ioctl_gma, sizeof(struct ifbrparam), 446 BC_F_COPYOUT }, 447 { bridge_ioctl_sma, sizeof(struct ifbrparam), 448 BC_F_COPYIN|BC_F_SUSER }, 449 450 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 451 BC_F_COPYIN|BC_F_SUSER }, 452 453 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 454 BC_F_COPYIN|BC_F_SUSER }, 455 456 { bridge_ioctl_addspan, sizeof(struct ifbreq), 457 BC_F_COPYIN|BC_F_SUSER }, 458 { bridge_ioctl_delspan, sizeof(struct ifbreq), 459 BC_F_COPYIN|BC_F_SUSER }, 460 461 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 462 BC_F_COPYOUT }, 463 464 { bridge_ioctl_grte, sizeof(struct ifbrparam), 465 BC_F_COPYOUT }, 466 467 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 468 BC_F_COPYIN|BC_F_COPYOUT }, 469 470 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 471 BC_F_COPYIN|BC_F_SUSER }, 472 473 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 474 BC_F_COPYIN|BC_F_SUSER }, 475 476 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 477 BC_F_COPYIN|BC_F_SUSER }, 478 479 }; 480 const int bridge_control_table_size = 481 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 482 483 LIST_HEAD(, bridge_softc) bridge_list; 484 485 static struct if_clone *bridge_cloner; 486 static const char bridge_name[] = "bridge"; 487 488 static int 489 bridge_modevent(module_t mod, int type, void *data) 490 { 491 492 switch (type) { 493 case MOD_LOAD: 494 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF); 495 bridge_cloner = if_clone_simple(bridge_name, 496 bridge_clone_create, bridge_clone_destroy, 0); 497 bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 498 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 499 UMA_ALIGN_PTR, 0); 500 LIST_INIT(&bridge_list); 501 bridge_input_p = bridge_input; 502 bridge_output_p = bridge_output; 503 bridge_dn_p = bridge_dummynet; 504 bridge_linkstate_p = bridge_linkstate; 505 bridge_detach_cookie = EVENTHANDLER_REGISTER( 506 ifnet_departure_event, bridge_ifdetach, NULL, 507 EVENTHANDLER_PRI_ANY); 508 break; 509 case MOD_UNLOAD: 510 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 511 bridge_detach_cookie); 512 if_clone_detach(bridge_cloner); 513 uma_zdestroy(bridge_rtnode_zone); 514 bridge_input_p = NULL; 515 bridge_output_p = NULL; 516 bridge_dn_p = NULL; 517 bridge_linkstate_p = NULL; 518 mtx_destroy(&bridge_list_mtx); 519 break; 520 default: 521 return (EOPNOTSUPP); 522 } 523 return (0); 524 } 525 526 static moduledata_t bridge_mod = { 527 "if_bridge", 528 bridge_modevent, 529 0 530 }; 531 532 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 533 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 534 535 /* 536 * handler for net.link.bridge.ipfw 537 */ 538 static int 539 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 540 { 541 int enable = pfil_ipfw; 542 int error; 543 544 error = sysctl_handle_int(oidp, &enable, 0, req); 545 enable = (enable) ? 1 : 0; 546 547 if (enable != pfil_ipfw) { 548 pfil_ipfw = enable; 549 550 /* 551 * Disable pfil so that ipfw doesnt run twice, if the user 552 * really wants both then they can re-enable pfil_bridge and/or 553 * pfil_member. Also allow non-ip packets as ipfw can filter by 554 * layer2 type. 555 */ 556 if (pfil_ipfw) { 557 pfil_onlyip = 0; 558 pfil_bridge = 0; 559 pfil_member = 0; 560 } 561 } 562 563 return (error); 564 } 565 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW, 566 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW"); 567 568 /* 569 * bridge_clone_create: 570 * 571 * Create a new bridge instance. 572 */ 573 static int 574 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 575 { 576 struct bridge_softc *sc, *sc2; 577 struct ifnet *bifp, *ifp; 578 int fb, retry; 579 unsigned long hostid; 580 581 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 582 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 583 if (ifp == NULL) { 584 free(sc, M_DEVBUF); 585 return (ENOSPC); 586 } 587 588 BRIDGE_LOCK_INIT(sc); 589 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 590 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 591 592 /* Initialize our routing table. */ 593 bridge_rtable_init(sc); 594 595 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 596 597 LIST_INIT(&sc->sc_iflist); 598 LIST_INIT(&sc->sc_spanlist); 599 600 ifp->if_softc = sc; 601 if_initname(ifp, bridge_name, unit); 602 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 603 ifp->if_ioctl = bridge_ioctl; 604 ifp->if_transmit = bridge_transmit; 605 ifp->if_qflush = bridge_qflush; 606 ifp->if_init = bridge_init; 607 ifp->if_type = IFT_BRIDGE; 608 609 /* 610 * Generate an ethernet address with a locally administered address. 611 * 612 * Since we are using random ethernet addresses for the bridge, it is 613 * possible that we might have address collisions, so make sure that 614 * this hardware address isn't already in use on another bridge. 615 * The first try uses the hostid and falls back to arc4rand(). 616 */ 617 fb = 0; 618 getcredhostid(curthread->td_ucred, &hostid); 619 do { 620 if (fb || hostid == 0) { 621 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1); 622 sc->sc_defaddr[0] &= ~1;/* clear multicast bit */ 623 sc->sc_defaddr[0] |= 2; /* set the LAA bit */ 624 } else { 625 sc->sc_defaddr[0] = 0x2; 626 sc->sc_defaddr[1] = (hostid >> 24) & 0xff; 627 sc->sc_defaddr[2] = (hostid >> 16) & 0xff; 628 sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff; 629 sc->sc_defaddr[4] = hostid & 0xff; 630 sc->sc_defaddr[5] = ifp->if_dunit & 0xff; 631 } 632 633 fb = 1; 634 retry = 0; 635 mtx_lock(&bridge_list_mtx); 636 LIST_FOREACH(sc2, &bridge_list, sc_list) { 637 bifp = sc2->sc_ifp; 638 if (memcmp(sc->sc_defaddr, 639 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) { 640 retry = 1; 641 break; 642 } 643 } 644 mtx_unlock(&bridge_list_mtx); 645 } while (retry == 1); 646 647 bstp_attach(&sc->sc_stp, &bridge_ops); 648 ether_ifattach(ifp, sc->sc_defaddr); 649 /* Now undo some of the damage... */ 650 ifp->if_baudrate = 0; 651 ifp->if_type = IFT_BRIDGE; 652 653 mtx_lock(&bridge_list_mtx); 654 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 655 mtx_unlock(&bridge_list_mtx); 656 657 return (0); 658 } 659 660 /* 661 * bridge_clone_destroy: 662 * 663 * Destroy a bridge instance. 664 */ 665 static void 666 bridge_clone_destroy(struct ifnet *ifp) 667 { 668 struct bridge_softc *sc = ifp->if_softc; 669 struct bridge_iflist *bif; 670 671 BRIDGE_LOCK(sc); 672 673 bridge_stop(ifp, 1); 674 ifp->if_flags &= ~IFF_UP; 675 676 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 677 bridge_delete_member(sc, bif, 0); 678 679 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 680 bridge_delete_span(sc, bif); 681 } 682 683 BRIDGE_UNLOCK(sc); 684 685 callout_drain(&sc->sc_brcallout); 686 687 mtx_lock(&bridge_list_mtx); 688 LIST_REMOVE(sc, sc_list); 689 mtx_unlock(&bridge_list_mtx); 690 691 bstp_detach(&sc->sc_stp); 692 ether_ifdetach(ifp); 693 if_free(ifp); 694 695 /* Tear down the routing table. */ 696 bridge_rtable_fini(sc); 697 698 BRIDGE_LOCK_DESTROY(sc); 699 free(sc, M_DEVBUF); 700 } 701 702 /* 703 * bridge_ioctl: 704 * 705 * Handle a control request from the operator. 706 */ 707 static int 708 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 709 { 710 struct bridge_softc *sc = ifp->if_softc; 711 struct ifreq *ifr = (struct ifreq *)data; 712 struct bridge_iflist *bif; 713 struct thread *td = curthread; 714 union { 715 struct ifbreq ifbreq; 716 struct ifbifconf ifbifconf; 717 struct ifbareq ifbareq; 718 struct ifbaconf ifbaconf; 719 struct ifbrparam ifbrparam; 720 struct ifbropreq ifbropreq; 721 } args; 722 struct ifdrv *ifd = (struct ifdrv *) data; 723 const struct bridge_control *bc; 724 int error = 0; 725 726 switch (cmd) { 727 728 case SIOCADDMULTI: 729 case SIOCDELMULTI: 730 break; 731 732 case SIOCGDRVSPEC: 733 case SIOCSDRVSPEC: 734 if (ifd->ifd_cmd >= bridge_control_table_size) { 735 error = EINVAL; 736 break; 737 } 738 bc = &bridge_control_table[ifd->ifd_cmd]; 739 740 if (cmd == SIOCGDRVSPEC && 741 (bc->bc_flags & BC_F_COPYOUT) == 0) { 742 error = EINVAL; 743 break; 744 } 745 else if (cmd == SIOCSDRVSPEC && 746 (bc->bc_flags & BC_F_COPYOUT) != 0) { 747 error = EINVAL; 748 break; 749 } 750 751 if (bc->bc_flags & BC_F_SUSER) { 752 error = priv_check(td, PRIV_NET_BRIDGE); 753 if (error) 754 break; 755 } 756 757 if (ifd->ifd_len != bc->bc_argsize || 758 ifd->ifd_len > sizeof(args)) { 759 error = EINVAL; 760 break; 761 } 762 763 bzero(&args, sizeof(args)); 764 if (bc->bc_flags & BC_F_COPYIN) { 765 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 766 if (error) 767 break; 768 } 769 770 BRIDGE_LOCK(sc); 771 error = (*bc->bc_func)(sc, &args); 772 BRIDGE_UNLOCK(sc); 773 if (error) 774 break; 775 776 if (bc->bc_flags & BC_F_COPYOUT) 777 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 778 779 break; 780 781 case SIOCSIFFLAGS: 782 if (!(ifp->if_flags & IFF_UP) && 783 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 784 /* 785 * If interface is marked down and it is running, 786 * then stop and disable it. 787 */ 788 BRIDGE_LOCK(sc); 789 bridge_stop(ifp, 1); 790 BRIDGE_UNLOCK(sc); 791 } else if ((ifp->if_flags & IFF_UP) && 792 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 793 /* 794 * If interface is marked up and it is stopped, then 795 * start it. 796 */ 797 (*ifp->if_init)(sc); 798 } 799 break; 800 801 case SIOCSIFMTU: 802 if (ifr->ifr_mtu < 576) { 803 error = EINVAL; 804 break; 805 } 806 if (LIST_EMPTY(&sc->sc_iflist)) { 807 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 808 break; 809 } 810 BRIDGE_LOCK(sc); 811 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 812 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) { 813 log(LOG_NOTICE, "%s: invalid MTU: %u(%s)" 814 " != %d\n", sc->sc_ifp->if_xname, 815 bif->bif_ifp->if_mtu, 816 bif->bif_ifp->if_xname, ifr->ifr_mtu); 817 error = EINVAL; 818 break; 819 } 820 } 821 if (!error) 822 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 823 BRIDGE_UNLOCK(sc); 824 break; 825 default: 826 /* 827 * drop the lock as ether_ioctl() will call bridge_start() and 828 * cause the lock to be recursed. 829 */ 830 error = ether_ioctl(ifp, cmd, data); 831 break; 832 } 833 834 return (error); 835 } 836 837 /* 838 * bridge_mutecaps: 839 * 840 * Clear or restore unwanted capabilities on the member interface 841 */ 842 static void 843 bridge_mutecaps(struct bridge_softc *sc) 844 { 845 struct bridge_iflist *bif; 846 int enabled, mask; 847 848 /* Initial bitmask of capabilities to test */ 849 mask = BRIDGE_IFCAPS_MASK; 850 851 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 852 /* Every member must support it or its disabled */ 853 mask &= bif->bif_savedcaps; 854 } 855 856 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 857 enabled = bif->bif_ifp->if_capenable; 858 enabled &= ~BRIDGE_IFCAPS_STRIP; 859 /* strip off mask bits and enable them again if allowed */ 860 enabled &= ~BRIDGE_IFCAPS_MASK; 861 enabled |= mask; 862 bridge_set_ifcap(sc, bif, enabled); 863 } 864 865 } 866 867 static void 868 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 869 { 870 struct ifnet *ifp = bif->bif_ifp; 871 struct ifreq ifr; 872 int error; 873 874 bzero(&ifr, sizeof(ifr)); 875 ifr.ifr_reqcap = set; 876 877 if (ifp->if_capenable != set) { 878 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 879 if (error) 880 if_printf(sc->sc_ifp, 881 "error setting interface capabilities on %s\n", 882 ifp->if_xname); 883 } 884 } 885 886 /* 887 * bridge_lookup_member: 888 * 889 * Lookup a bridge member interface. 890 */ 891 static struct bridge_iflist * 892 bridge_lookup_member(struct bridge_softc *sc, const char *name) 893 { 894 struct bridge_iflist *bif; 895 struct ifnet *ifp; 896 897 BRIDGE_LOCK_ASSERT(sc); 898 899 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 900 ifp = bif->bif_ifp; 901 if (strcmp(ifp->if_xname, name) == 0) 902 return (bif); 903 } 904 905 return (NULL); 906 } 907 908 /* 909 * bridge_lookup_member_if: 910 * 911 * Lookup a bridge member interface by ifnet*. 912 */ 913 static struct bridge_iflist * 914 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 915 { 916 struct bridge_iflist *bif; 917 918 BRIDGE_LOCK_ASSERT(sc); 919 920 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 921 if (bif->bif_ifp == member_ifp) 922 return (bif); 923 } 924 925 return (NULL); 926 } 927 928 /* 929 * bridge_delete_member: 930 * 931 * Delete the specified member interface. 932 */ 933 static void 934 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 935 int gone) 936 { 937 struct ifnet *ifs = bif->bif_ifp; 938 struct ifnet *fif = NULL; 939 940 BRIDGE_LOCK_ASSERT(sc); 941 942 if (bif->bif_flags & IFBIF_STP) 943 bstp_disable(&bif->bif_stp); 944 945 ifs->if_bridge = NULL; 946 BRIDGE_XLOCK(sc); 947 LIST_REMOVE(bif, bif_next); 948 BRIDGE_XDROP(sc); 949 950 /* 951 * If removing the interface that gave the bridge its mac address, set 952 * the mac address of the bridge to the address of the next member, or 953 * to its default address if no members are left. 954 */ 955 if (bridge_inherit_mac && sc->sc_ifaddr == ifs) { 956 if (LIST_EMPTY(&sc->sc_iflist)) { 957 bcopy(sc->sc_defaddr, 958 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 959 sc->sc_ifaddr = NULL; 960 } else { 961 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp; 962 bcopy(IF_LLADDR(fif), 963 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 964 sc->sc_ifaddr = fif; 965 } 966 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 967 } 968 969 bridge_linkcheck(sc); 970 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 971 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 972 KASSERT(bif->bif_addrcnt == 0, 973 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 974 975 BRIDGE_UNLOCK(sc); 976 if (!gone) { 977 switch (ifs->if_type) { 978 case IFT_ETHER: 979 case IFT_L2VLAN: 980 /* 981 * Take the interface out of promiscuous mode. 982 */ 983 (void) ifpromisc(ifs, 0); 984 break; 985 986 case IFT_GIF: 987 break; 988 989 default: 990 #ifdef DIAGNOSTIC 991 panic("bridge_delete_member: impossible"); 992 #endif 993 break; 994 } 995 /* reneable any interface capabilities */ 996 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 997 } 998 bstp_destroy(&bif->bif_stp); /* prepare to free */ 999 BRIDGE_LOCK(sc); 1000 free(bif, M_DEVBUF); 1001 } 1002 1003 /* 1004 * bridge_delete_span: 1005 * 1006 * Delete the specified span interface. 1007 */ 1008 static void 1009 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1010 { 1011 BRIDGE_LOCK_ASSERT(sc); 1012 1013 KASSERT(bif->bif_ifp->if_bridge == NULL, 1014 ("%s: not a span interface", __func__)); 1015 1016 LIST_REMOVE(bif, bif_next); 1017 free(bif, M_DEVBUF); 1018 } 1019 1020 static int 1021 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1022 { 1023 struct ifbreq *req = arg; 1024 struct bridge_iflist *bif = NULL; 1025 struct ifnet *ifs; 1026 int error = 0; 1027 1028 ifs = ifunit(req->ifbr_ifsname); 1029 if (ifs == NULL) 1030 return (ENOENT); 1031 if (ifs->if_ioctl == NULL) /* must be supported */ 1032 return (EINVAL); 1033 1034 /* If it's in the span list, it can't be a member. */ 1035 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1036 if (ifs == bif->bif_ifp) 1037 return (EBUSY); 1038 1039 if (ifs->if_bridge == sc) 1040 return (EEXIST); 1041 1042 if (ifs->if_bridge != NULL) 1043 return (EBUSY); 1044 1045 switch (ifs->if_type) { 1046 case IFT_ETHER: 1047 case IFT_L2VLAN: 1048 case IFT_GIF: 1049 /* permitted interface types */ 1050 break; 1051 default: 1052 return (EINVAL); 1053 } 1054 1055 #ifdef INET6 1056 /* 1057 * Two valid inet6 addresses with link-local scope must not be 1058 * on the parent interface and the member interfaces at the 1059 * same time. This restriction is needed to prevent violation 1060 * of link-local scope zone. Attempts to add a member 1061 * interface which has inet6 addresses when the parent has 1062 * inet6 triggers removal of all inet6 addresses on the member 1063 * interface. 1064 */ 1065 1066 /* Check if the parent interface has a link-local scope addr. */ 1067 if (V_allow_llz_overlap == 0 && 1068 in6ifa_llaonifp(sc->sc_ifp) != NULL) { 1069 /* 1070 * If any, remove all inet6 addresses from the member 1071 * interfaces. 1072 */ 1073 BRIDGE_XLOCK(sc); 1074 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1075 if (in6ifa_llaonifp(bif->bif_ifp)) { 1076 BRIDGE_UNLOCK(sc); 1077 in6_ifdetach(bif->bif_ifp); 1078 BRIDGE_LOCK(sc); 1079 if_printf(sc->sc_ifp, 1080 "IPv6 addresses on %s have been removed " 1081 "before adding it as a member to prevent " 1082 "IPv6 address scope violation.\n", 1083 bif->bif_ifp->if_xname); 1084 } 1085 } 1086 BRIDGE_XDROP(sc); 1087 if (in6ifa_llaonifp(ifs)) { 1088 BRIDGE_UNLOCK(sc); 1089 in6_ifdetach(ifs); 1090 BRIDGE_LOCK(sc); 1091 if_printf(sc->sc_ifp, 1092 "IPv6 addresses on %s have been removed " 1093 "before adding it as a member to prevent " 1094 "IPv6 address scope violation.\n", 1095 ifs->if_xname); 1096 } 1097 } 1098 #endif 1099 /* Allow the first Ethernet member to define the MTU */ 1100 if (LIST_EMPTY(&sc->sc_iflist)) 1101 sc->sc_ifp->if_mtu = ifs->if_mtu; 1102 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1103 if_printf(sc->sc_ifp, "invalid MTU: %u(%s) != %u\n", 1104 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu); 1105 return (EINVAL); 1106 } 1107 1108 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1109 if (bif == NULL) 1110 return (ENOMEM); 1111 1112 bif->bif_ifp = ifs; 1113 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1114 bif->bif_savedcaps = ifs->if_capenable; 1115 1116 /* 1117 * Assign the interface's MAC address to the bridge if it's the first 1118 * member and the MAC address of the bridge has not been changed from 1119 * the default randomly generated one. 1120 */ 1121 if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) && 1122 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) { 1123 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1124 sc->sc_ifaddr = ifs; 1125 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1126 } 1127 1128 ifs->if_bridge = sc; 1129 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1130 /* 1131 * XXX: XLOCK HERE!?! 1132 * 1133 * NOTE: insert_***HEAD*** should be safe for the traversals. 1134 */ 1135 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1136 1137 /* Set interface capabilities to the intersection set of all members */ 1138 bridge_mutecaps(sc); 1139 bridge_linkcheck(sc); 1140 1141 /* Place the interface into promiscuous mode */ 1142 switch (ifs->if_type) { 1143 case IFT_ETHER: 1144 case IFT_L2VLAN: 1145 BRIDGE_UNLOCK(sc); 1146 error = ifpromisc(ifs, 1); 1147 BRIDGE_LOCK(sc); 1148 break; 1149 } 1150 1151 if (error) { 1152 bridge_delete_member(sc, bif, 0); 1153 free(bif, M_DEVBUF); 1154 } 1155 return (error); 1156 } 1157 1158 static int 1159 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1160 { 1161 struct ifbreq *req = arg; 1162 struct bridge_iflist *bif; 1163 1164 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1165 if (bif == NULL) 1166 return (ENOENT); 1167 1168 bridge_delete_member(sc, bif, 0); 1169 1170 return (0); 1171 } 1172 1173 static int 1174 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1175 { 1176 struct ifbreq *req = arg; 1177 struct bridge_iflist *bif; 1178 struct bstp_port *bp; 1179 1180 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1181 if (bif == NULL) 1182 return (ENOENT); 1183 1184 bp = &bif->bif_stp; 1185 req->ifbr_ifsflags = bif->bif_flags; 1186 req->ifbr_state = bp->bp_state; 1187 req->ifbr_priority = bp->bp_priority; 1188 req->ifbr_path_cost = bp->bp_path_cost; 1189 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1190 req->ifbr_proto = bp->bp_protover; 1191 req->ifbr_role = bp->bp_role; 1192 req->ifbr_stpflags = bp->bp_flags; 1193 req->ifbr_addrcnt = bif->bif_addrcnt; 1194 req->ifbr_addrmax = bif->bif_addrmax; 1195 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1196 1197 /* Copy STP state options as flags */ 1198 if (bp->bp_operedge) 1199 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1200 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1201 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1202 if (bp->bp_ptp_link) 1203 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1204 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1205 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1206 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1207 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1208 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1209 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1210 return (0); 1211 } 1212 1213 static int 1214 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1215 { 1216 struct ifbreq *req = arg; 1217 struct bridge_iflist *bif; 1218 struct bstp_port *bp; 1219 int error; 1220 1221 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1222 if (bif == NULL) 1223 return (ENOENT); 1224 bp = &bif->bif_stp; 1225 1226 if (req->ifbr_ifsflags & IFBIF_SPAN) 1227 /* SPAN is readonly */ 1228 return (EINVAL); 1229 1230 if (req->ifbr_ifsflags & IFBIF_STP) { 1231 if ((bif->bif_flags & IFBIF_STP) == 0) { 1232 error = bstp_enable(&bif->bif_stp); 1233 if (error) 1234 return (error); 1235 } 1236 } else { 1237 if ((bif->bif_flags & IFBIF_STP) != 0) 1238 bstp_disable(&bif->bif_stp); 1239 } 1240 1241 /* Pass on STP flags */ 1242 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1243 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1244 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1245 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1246 1247 /* Save the bits relating to the bridge */ 1248 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1249 1250 return (0); 1251 } 1252 1253 static int 1254 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1255 { 1256 struct ifbrparam *param = arg; 1257 1258 sc->sc_brtmax = param->ifbrp_csize; 1259 bridge_rttrim(sc); 1260 1261 return (0); 1262 } 1263 1264 static int 1265 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1266 { 1267 struct ifbrparam *param = arg; 1268 1269 param->ifbrp_csize = sc->sc_brtmax; 1270 1271 return (0); 1272 } 1273 1274 static int 1275 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1276 { 1277 struct ifbifconf *bifc = arg; 1278 struct bridge_iflist *bif; 1279 struct ifbreq breq; 1280 char *buf, *outbuf; 1281 int count, buflen, len, error = 0; 1282 1283 count = 0; 1284 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1285 count++; 1286 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1287 count++; 1288 1289 buflen = sizeof(breq) * count; 1290 if (bifc->ifbic_len == 0) { 1291 bifc->ifbic_len = buflen; 1292 return (0); 1293 } 1294 BRIDGE_UNLOCK(sc); 1295 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1296 BRIDGE_LOCK(sc); 1297 1298 count = 0; 1299 buf = outbuf; 1300 len = min(bifc->ifbic_len, buflen); 1301 bzero(&breq, sizeof(breq)); 1302 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1303 if (len < sizeof(breq)) 1304 break; 1305 1306 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1307 sizeof(breq.ifbr_ifsname)); 1308 /* Fill in the ifbreq structure */ 1309 error = bridge_ioctl_gifflags(sc, &breq); 1310 if (error) 1311 break; 1312 memcpy(buf, &breq, sizeof(breq)); 1313 count++; 1314 buf += sizeof(breq); 1315 len -= sizeof(breq); 1316 } 1317 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1318 if (len < sizeof(breq)) 1319 break; 1320 1321 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1322 sizeof(breq.ifbr_ifsname)); 1323 breq.ifbr_ifsflags = bif->bif_flags; 1324 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1325 memcpy(buf, &breq, sizeof(breq)); 1326 count++; 1327 buf += sizeof(breq); 1328 len -= sizeof(breq); 1329 } 1330 1331 BRIDGE_UNLOCK(sc); 1332 bifc->ifbic_len = sizeof(breq) * count; 1333 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1334 BRIDGE_LOCK(sc); 1335 free(outbuf, M_TEMP); 1336 return (error); 1337 } 1338 1339 static int 1340 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1341 { 1342 struct ifbaconf *bac = arg; 1343 struct bridge_rtnode *brt; 1344 struct ifbareq bareq; 1345 char *buf, *outbuf; 1346 int count, buflen, len, error = 0; 1347 1348 if (bac->ifbac_len == 0) 1349 return (0); 1350 1351 count = 0; 1352 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1353 count++; 1354 buflen = sizeof(bareq) * count; 1355 1356 BRIDGE_UNLOCK(sc); 1357 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1358 BRIDGE_LOCK(sc); 1359 1360 count = 0; 1361 buf = outbuf; 1362 len = min(bac->ifbac_len, buflen); 1363 bzero(&bareq, sizeof(bareq)); 1364 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1365 if (len < sizeof(bareq)) 1366 goto out; 1367 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1368 sizeof(bareq.ifba_ifsname)); 1369 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1370 bareq.ifba_vlan = brt->brt_vlan; 1371 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1372 time_uptime < brt->brt_expire) 1373 bareq.ifba_expire = brt->brt_expire - time_uptime; 1374 else 1375 bareq.ifba_expire = 0; 1376 bareq.ifba_flags = brt->brt_flags; 1377 1378 memcpy(buf, &bareq, sizeof(bareq)); 1379 count++; 1380 buf += sizeof(bareq); 1381 len -= sizeof(bareq); 1382 } 1383 out: 1384 BRIDGE_UNLOCK(sc); 1385 bac->ifbac_len = sizeof(bareq) * count; 1386 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1387 BRIDGE_LOCK(sc); 1388 free(outbuf, M_TEMP); 1389 return (error); 1390 } 1391 1392 static int 1393 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1394 { 1395 struct ifbareq *req = arg; 1396 struct bridge_iflist *bif; 1397 int error; 1398 1399 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1400 if (bif == NULL) 1401 return (ENOENT); 1402 1403 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1404 req->ifba_flags); 1405 1406 return (error); 1407 } 1408 1409 static int 1410 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1411 { 1412 struct ifbrparam *param = arg; 1413 1414 sc->sc_brttimeout = param->ifbrp_ctime; 1415 return (0); 1416 } 1417 1418 static int 1419 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1420 { 1421 struct ifbrparam *param = arg; 1422 1423 param->ifbrp_ctime = sc->sc_brttimeout; 1424 return (0); 1425 } 1426 1427 static int 1428 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1429 { 1430 struct ifbareq *req = arg; 1431 1432 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1433 } 1434 1435 static int 1436 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1437 { 1438 struct ifbreq *req = arg; 1439 1440 bridge_rtflush(sc, req->ifbr_ifsflags); 1441 return (0); 1442 } 1443 1444 static int 1445 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1446 { 1447 struct ifbrparam *param = arg; 1448 struct bstp_state *bs = &sc->sc_stp; 1449 1450 param->ifbrp_prio = bs->bs_bridge_priority; 1451 return (0); 1452 } 1453 1454 static int 1455 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1456 { 1457 struct ifbrparam *param = arg; 1458 1459 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1460 } 1461 1462 static int 1463 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1464 { 1465 struct ifbrparam *param = arg; 1466 struct bstp_state *bs = &sc->sc_stp; 1467 1468 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1469 return (0); 1470 } 1471 1472 static int 1473 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1474 { 1475 struct ifbrparam *param = arg; 1476 1477 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1478 } 1479 1480 static int 1481 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1482 { 1483 struct ifbrparam *param = arg; 1484 struct bstp_state *bs = &sc->sc_stp; 1485 1486 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1487 return (0); 1488 } 1489 1490 static int 1491 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1492 { 1493 struct ifbrparam *param = arg; 1494 1495 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1496 } 1497 1498 static int 1499 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1500 { 1501 struct ifbrparam *param = arg; 1502 struct bstp_state *bs = &sc->sc_stp; 1503 1504 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1505 return (0); 1506 } 1507 1508 static int 1509 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1510 { 1511 struct ifbrparam *param = arg; 1512 1513 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1514 } 1515 1516 static int 1517 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1518 { 1519 struct ifbreq *req = arg; 1520 struct bridge_iflist *bif; 1521 1522 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1523 if (bif == NULL) 1524 return (ENOENT); 1525 1526 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1527 } 1528 1529 static int 1530 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1531 { 1532 struct ifbreq *req = arg; 1533 struct bridge_iflist *bif; 1534 1535 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1536 if (bif == NULL) 1537 return (ENOENT); 1538 1539 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1540 } 1541 1542 static int 1543 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1544 { 1545 struct ifbreq *req = arg; 1546 struct bridge_iflist *bif; 1547 1548 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1549 if (bif == NULL) 1550 return (ENOENT); 1551 1552 bif->bif_addrmax = req->ifbr_addrmax; 1553 return (0); 1554 } 1555 1556 static int 1557 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1558 { 1559 struct ifbreq *req = arg; 1560 struct bridge_iflist *bif = NULL; 1561 struct ifnet *ifs; 1562 1563 ifs = ifunit(req->ifbr_ifsname); 1564 if (ifs == NULL) 1565 return (ENOENT); 1566 1567 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1568 if (ifs == bif->bif_ifp) 1569 return (EBUSY); 1570 1571 if (ifs->if_bridge != NULL) 1572 return (EBUSY); 1573 1574 switch (ifs->if_type) { 1575 case IFT_ETHER: 1576 case IFT_GIF: 1577 case IFT_L2VLAN: 1578 break; 1579 default: 1580 return (EINVAL); 1581 } 1582 1583 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1584 if (bif == NULL) 1585 return (ENOMEM); 1586 1587 bif->bif_ifp = ifs; 1588 bif->bif_flags = IFBIF_SPAN; 1589 1590 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1591 1592 return (0); 1593 } 1594 1595 static int 1596 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1597 { 1598 struct ifbreq *req = arg; 1599 struct bridge_iflist *bif; 1600 struct ifnet *ifs; 1601 1602 ifs = ifunit(req->ifbr_ifsname); 1603 if (ifs == NULL) 1604 return (ENOENT); 1605 1606 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1607 if (ifs == bif->bif_ifp) 1608 break; 1609 1610 if (bif == NULL) 1611 return (ENOENT); 1612 1613 bridge_delete_span(sc, bif); 1614 1615 return (0); 1616 } 1617 1618 static int 1619 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1620 { 1621 struct ifbropreq *req = arg; 1622 struct bstp_state *bs = &sc->sc_stp; 1623 struct bstp_port *root_port; 1624 1625 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1626 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1627 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1628 1629 root_port = bs->bs_root_port; 1630 if (root_port == NULL) 1631 req->ifbop_root_port = 0; 1632 else 1633 req->ifbop_root_port = root_port->bp_ifp->if_index; 1634 1635 req->ifbop_holdcount = bs->bs_txholdcount; 1636 req->ifbop_priority = bs->bs_bridge_priority; 1637 req->ifbop_protocol = bs->bs_protover; 1638 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1639 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1640 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1641 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1642 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1643 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1644 1645 return (0); 1646 } 1647 1648 static int 1649 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1650 { 1651 struct ifbrparam *param = arg; 1652 1653 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1654 return (0); 1655 } 1656 1657 static int 1658 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1659 { 1660 struct ifbpstpconf *bifstp = arg; 1661 struct bridge_iflist *bif; 1662 struct bstp_port *bp; 1663 struct ifbpstpreq bpreq; 1664 char *buf, *outbuf; 1665 int count, buflen, len, error = 0; 1666 1667 count = 0; 1668 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1669 if ((bif->bif_flags & IFBIF_STP) != 0) 1670 count++; 1671 } 1672 1673 buflen = sizeof(bpreq) * count; 1674 if (bifstp->ifbpstp_len == 0) { 1675 bifstp->ifbpstp_len = buflen; 1676 return (0); 1677 } 1678 1679 BRIDGE_UNLOCK(sc); 1680 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1681 BRIDGE_LOCK(sc); 1682 1683 count = 0; 1684 buf = outbuf; 1685 len = min(bifstp->ifbpstp_len, buflen); 1686 bzero(&bpreq, sizeof(bpreq)); 1687 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1688 if (len < sizeof(bpreq)) 1689 break; 1690 1691 if ((bif->bif_flags & IFBIF_STP) == 0) 1692 continue; 1693 1694 bp = &bif->bif_stp; 1695 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1696 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1697 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1698 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1699 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1700 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1701 1702 memcpy(buf, &bpreq, sizeof(bpreq)); 1703 count++; 1704 buf += sizeof(bpreq); 1705 len -= sizeof(bpreq); 1706 } 1707 1708 BRIDGE_UNLOCK(sc); 1709 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1710 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1711 BRIDGE_LOCK(sc); 1712 free(outbuf, M_TEMP); 1713 return (error); 1714 } 1715 1716 static int 1717 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1718 { 1719 struct ifbrparam *param = arg; 1720 1721 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1722 } 1723 1724 static int 1725 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1726 { 1727 struct ifbrparam *param = arg; 1728 1729 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1730 } 1731 1732 /* 1733 * bridge_ifdetach: 1734 * 1735 * Detach an interface from a bridge. Called when a member 1736 * interface is detaching. 1737 */ 1738 static void 1739 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1740 { 1741 struct bridge_softc *sc = ifp->if_bridge; 1742 struct bridge_iflist *bif; 1743 1744 if (ifp->if_flags & IFF_RENAMING) 1745 return; 1746 1747 /* Check if the interface is a bridge member */ 1748 if (sc != NULL) { 1749 BRIDGE_LOCK(sc); 1750 1751 bif = bridge_lookup_member_if(sc, ifp); 1752 if (bif != NULL) 1753 bridge_delete_member(sc, bif, 1); 1754 1755 BRIDGE_UNLOCK(sc); 1756 return; 1757 } 1758 1759 /* Check if the interface is a span port */ 1760 mtx_lock(&bridge_list_mtx); 1761 LIST_FOREACH(sc, &bridge_list, sc_list) { 1762 BRIDGE_LOCK(sc); 1763 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1764 if (ifp == bif->bif_ifp) { 1765 bridge_delete_span(sc, bif); 1766 break; 1767 } 1768 1769 BRIDGE_UNLOCK(sc); 1770 } 1771 mtx_unlock(&bridge_list_mtx); 1772 } 1773 1774 /* 1775 * bridge_init: 1776 * 1777 * Initialize a bridge interface. 1778 */ 1779 static void 1780 bridge_init(void *xsc) 1781 { 1782 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1783 struct ifnet *ifp = sc->sc_ifp; 1784 1785 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1786 return; 1787 1788 BRIDGE_LOCK(sc); 1789 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1790 bridge_timer, sc); 1791 1792 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1793 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1794 1795 BRIDGE_UNLOCK(sc); 1796 } 1797 1798 /* 1799 * bridge_stop: 1800 * 1801 * Stop the bridge interface. 1802 */ 1803 static void 1804 bridge_stop(struct ifnet *ifp, int disable) 1805 { 1806 struct bridge_softc *sc = ifp->if_softc; 1807 1808 BRIDGE_LOCK_ASSERT(sc); 1809 1810 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1811 return; 1812 1813 callout_stop(&sc->sc_brcallout); 1814 bstp_stop(&sc->sc_stp); 1815 1816 bridge_rtflush(sc, IFBF_FLUSHDYN); 1817 1818 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1819 } 1820 1821 /* 1822 * bridge_enqueue: 1823 * 1824 * Enqueue a packet on a bridge member interface. 1825 * 1826 */ 1827 static int 1828 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1829 { 1830 int len, err = 0; 1831 short mflags; 1832 struct mbuf *m0; 1833 1834 /* We may be sending a fragment so traverse the mbuf */ 1835 for (; m; m = m0) { 1836 m0 = m->m_nextpkt; 1837 m->m_nextpkt = NULL; 1838 len = m->m_pkthdr.len; 1839 mflags = m->m_flags; 1840 1841 /* 1842 * If underlying interface can not do VLAN tag insertion itself 1843 * then attach a packet tag that holds it. 1844 */ 1845 if ((m->m_flags & M_VLANTAG) && 1846 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1847 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1848 if (m == NULL) { 1849 if_printf(dst_ifp, 1850 "unable to prepend VLAN header\n"); 1851 dst_ifp->if_oerrors++; 1852 continue; 1853 } 1854 m->m_flags &= ~M_VLANTAG; 1855 } 1856 1857 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 1858 m_freem(m0); 1859 sc->sc_ifp->if_oerrors++; 1860 break; 1861 } 1862 1863 sc->sc_ifp->if_opackets++; 1864 sc->sc_ifp->if_obytes += len; 1865 if (mflags & M_MCAST) 1866 sc->sc_ifp->if_omcasts++; 1867 } 1868 1869 return (err); 1870 } 1871 1872 /* 1873 * bridge_dummynet: 1874 * 1875 * Receive a queued packet from dummynet and pass it on to the output 1876 * interface. 1877 * 1878 * The mbuf has the Ethernet header already attached. 1879 */ 1880 static void 1881 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1882 { 1883 struct bridge_softc *sc; 1884 1885 sc = ifp->if_bridge; 1886 1887 /* 1888 * The packet didnt originate from a member interface. This should only 1889 * ever happen if a member interface is removed while packets are 1890 * queued for it. 1891 */ 1892 if (sc == NULL) { 1893 m_freem(m); 1894 return; 1895 } 1896 1897 if (PFIL_HOOKED(&V_inet_pfil_hook) 1898 #ifdef INET6 1899 || PFIL_HOOKED(&V_inet6_pfil_hook) 1900 #endif 1901 ) { 1902 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1903 return; 1904 if (m == NULL) 1905 return; 1906 } 1907 1908 bridge_enqueue(sc, ifp, m); 1909 } 1910 1911 /* 1912 * bridge_output: 1913 * 1914 * Send output from a bridge member interface. This 1915 * performs the bridging function for locally originated 1916 * packets. 1917 * 1918 * The mbuf has the Ethernet header already attached. We must 1919 * enqueue or free the mbuf before returning. 1920 */ 1921 static int 1922 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1923 struct rtentry *rt) 1924 { 1925 struct ether_header *eh; 1926 struct ifnet *dst_if; 1927 struct bridge_softc *sc; 1928 uint16_t vlan; 1929 1930 if (m->m_len < ETHER_HDR_LEN) { 1931 m = m_pullup(m, ETHER_HDR_LEN); 1932 if (m == NULL) 1933 return (0); 1934 } 1935 1936 eh = mtod(m, struct ether_header *); 1937 sc = ifp->if_bridge; 1938 vlan = VLANTAGOF(m); 1939 1940 BRIDGE_LOCK(sc); 1941 1942 /* 1943 * If bridge is down, but the original output interface is up, 1944 * go ahead and send out that interface. Otherwise, the packet 1945 * is dropped below. 1946 */ 1947 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1948 dst_if = ifp; 1949 goto sendunicast; 1950 } 1951 1952 /* 1953 * If the packet is a multicast, or we don't know a better way to 1954 * get there, send to all interfaces. 1955 */ 1956 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1957 dst_if = NULL; 1958 else 1959 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 1960 if (dst_if == NULL) { 1961 struct bridge_iflist *bif; 1962 struct mbuf *mc; 1963 int error = 0, used = 0; 1964 1965 bridge_span(sc, m); 1966 1967 BRIDGE_LOCK2REF(sc, error); 1968 if (error) { 1969 m_freem(m); 1970 return (0); 1971 } 1972 1973 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1974 dst_if = bif->bif_ifp; 1975 1976 if (dst_if->if_type == IFT_GIF) 1977 continue; 1978 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 1979 continue; 1980 1981 /* 1982 * If this is not the original output interface, 1983 * and the interface is participating in spanning 1984 * tree, make sure the port is in a state that 1985 * allows forwarding. 1986 */ 1987 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 1988 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 1989 continue; 1990 1991 if (LIST_NEXT(bif, bif_next) == NULL) { 1992 used = 1; 1993 mc = m; 1994 } else { 1995 mc = m_copypacket(m, M_NOWAIT); 1996 if (mc == NULL) { 1997 sc->sc_ifp->if_oerrors++; 1998 continue; 1999 } 2000 } 2001 2002 bridge_enqueue(sc, dst_if, mc); 2003 } 2004 if (used == 0) 2005 m_freem(m); 2006 BRIDGE_UNREF(sc); 2007 return (0); 2008 } 2009 2010 sendunicast: 2011 /* 2012 * XXX Spanning tree consideration here? 2013 */ 2014 2015 bridge_span(sc, m); 2016 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2017 m_freem(m); 2018 BRIDGE_UNLOCK(sc); 2019 return (0); 2020 } 2021 2022 BRIDGE_UNLOCK(sc); 2023 bridge_enqueue(sc, dst_if, m); 2024 return (0); 2025 } 2026 2027 /* 2028 * bridge_transmit: 2029 * 2030 * Do output on a bridge. 2031 * 2032 */ 2033 static int 2034 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2035 { 2036 struct bridge_softc *sc; 2037 struct ether_header *eh; 2038 struct ifnet *dst_if; 2039 int error = 0; 2040 2041 sc = ifp->if_softc; 2042 2043 ETHER_BPF_MTAP(ifp, m); 2044 2045 eh = mtod(m, struct ether_header *); 2046 2047 BRIDGE_LOCK(sc); 2048 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2049 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) { 2050 BRIDGE_UNLOCK(sc); 2051 error = bridge_enqueue(sc, dst_if, m); 2052 } else 2053 bridge_broadcast(sc, ifp, m, 0); 2054 2055 return (error); 2056 } 2057 2058 /* 2059 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2060 */ 2061 static void 2062 bridge_qflush(struct ifnet *ifp __unused) 2063 { 2064 } 2065 2066 /* 2067 * bridge_forward: 2068 * 2069 * The forwarding function of the bridge. 2070 * 2071 * NOTE: Releases the lock on return. 2072 */ 2073 static void 2074 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2075 struct mbuf *m) 2076 { 2077 struct bridge_iflist *dbif; 2078 struct ifnet *src_if, *dst_if, *ifp; 2079 struct ether_header *eh; 2080 uint16_t vlan; 2081 uint8_t *dst; 2082 int error; 2083 2084 src_if = m->m_pkthdr.rcvif; 2085 ifp = sc->sc_ifp; 2086 2087 ifp->if_ipackets++; 2088 ifp->if_ibytes += m->m_pkthdr.len; 2089 vlan = VLANTAGOF(m); 2090 2091 if ((sbif->bif_flags & IFBIF_STP) && 2092 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2093 goto drop; 2094 2095 eh = mtod(m, struct ether_header *); 2096 dst = eh->ether_dhost; 2097 2098 /* If the interface is learning, record the address. */ 2099 if (sbif->bif_flags & IFBIF_LEARNING) { 2100 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2101 sbif, 0, IFBAF_DYNAMIC); 2102 /* 2103 * If the interface has addresses limits then deny any source 2104 * that is not in the cache. 2105 */ 2106 if (error && sbif->bif_addrmax) 2107 goto drop; 2108 } 2109 2110 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2111 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2112 goto drop; 2113 2114 /* 2115 * At this point, the port either doesn't participate 2116 * in spanning tree or it is in the forwarding state. 2117 */ 2118 2119 /* 2120 * If the packet is unicast, destined for someone on 2121 * "this" side of the bridge, drop it. 2122 */ 2123 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2124 dst_if = bridge_rtlookup(sc, dst, vlan); 2125 if (src_if == dst_if) 2126 goto drop; 2127 } else { 2128 /* 2129 * Check if its a reserved multicast address, any address 2130 * listed in 802.1D section 7.12.6 may not be forwarded by the 2131 * bridge. 2132 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2133 */ 2134 if (dst[0] == 0x01 && dst[1] == 0x80 && 2135 dst[2] == 0xc2 && dst[3] == 0x00 && 2136 dst[4] == 0x00 && dst[5] <= 0x0f) 2137 goto drop; 2138 2139 /* ...forward it to all interfaces. */ 2140 ifp->if_imcasts++; 2141 dst_if = NULL; 2142 } 2143 2144 /* 2145 * If we have a destination interface which is a member of our bridge, 2146 * OR this is a unicast packet, push it through the bpf(4) machinery. 2147 * For broadcast or multicast packets, don't bother because it will 2148 * be reinjected into ether_input. We do this before we pass the packets 2149 * through the pfil(9) framework, as it is possible that pfil(9) will 2150 * drop the packet, or possibly modify it, making it difficult to debug 2151 * firewall issues on the bridge. 2152 */ 2153 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2154 ETHER_BPF_MTAP(ifp, m); 2155 2156 /* run the packet filter */ 2157 if (PFIL_HOOKED(&V_inet_pfil_hook) 2158 #ifdef INET6 2159 || PFIL_HOOKED(&V_inet6_pfil_hook) 2160 #endif 2161 ) { 2162 BRIDGE_UNLOCK(sc); 2163 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2164 return; 2165 if (m == NULL) 2166 return; 2167 BRIDGE_LOCK(sc); 2168 } 2169 2170 if (dst_if == NULL) { 2171 bridge_broadcast(sc, src_if, m, 1); 2172 return; 2173 } 2174 2175 /* 2176 * At this point, we're dealing with a unicast frame 2177 * going to a different interface. 2178 */ 2179 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2180 goto drop; 2181 2182 dbif = bridge_lookup_member_if(sc, dst_if); 2183 if (dbif == NULL) 2184 /* Not a member of the bridge (anymore?) */ 2185 goto drop; 2186 2187 /* Private segments can not talk to each other */ 2188 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2189 goto drop; 2190 2191 if ((dbif->bif_flags & IFBIF_STP) && 2192 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2193 goto drop; 2194 2195 BRIDGE_UNLOCK(sc); 2196 2197 if (PFIL_HOOKED(&V_inet_pfil_hook) 2198 #ifdef INET6 2199 || PFIL_HOOKED(&V_inet6_pfil_hook) 2200 #endif 2201 ) { 2202 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2203 return; 2204 if (m == NULL) 2205 return; 2206 } 2207 2208 bridge_enqueue(sc, dst_if, m); 2209 return; 2210 2211 drop: 2212 BRIDGE_UNLOCK(sc); 2213 m_freem(m); 2214 } 2215 2216 /* 2217 * bridge_input: 2218 * 2219 * Receive input from a member interface. Queue the packet for 2220 * bridging if it is not for us. 2221 */ 2222 static struct mbuf * 2223 bridge_input(struct ifnet *ifp, struct mbuf *m) 2224 { 2225 struct bridge_softc *sc = ifp->if_bridge; 2226 struct bridge_iflist *bif, *bif2; 2227 struct ifnet *bifp; 2228 struct ether_header *eh; 2229 struct mbuf *mc, *mc2; 2230 uint16_t vlan; 2231 int error; 2232 2233 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2234 return (m); 2235 2236 bifp = sc->sc_ifp; 2237 vlan = VLANTAGOF(m); 2238 2239 /* 2240 * Implement support for bridge monitoring. If this flag has been 2241 * set on this interface, discard the packet once we push it through 2242 * the bpf(4) machinery, but before we do, increment the byte and 2243 * packet counters associated with this interface. 2244 */ 2245 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2246 m->m_pkthdr.rcvif = bifp; 2247 ETHER_BPF_MTAP(bifp, m); 2248 bifp->if_ipackets++; 2249 bifp->if_ibytes += m->m_pkthdr.len; 2250 m_freem(m); 2251 return (NULL); 2252 } 2253 BRIDGE_LOCK(sc); 2254 bif = bridge_lookup_member_if(sc, ifp); 2255 if (bif == NULL) { 2256 BRIDGE_UNLOCK(sc); 2257 return (m); 2258 } 2259 2260 eh = mtod(m, struct ether_header *); 2261 2262 bridge_span(sc, m); 2263 2264 if (m->m_flags & (M_BCAST|M_MCAST)) { 2265 /* Tap off 802.1D packets; they do not get forwarded. */ 2266 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2267 ETHER_ADDR_LEN) == 0) { 2268 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2269 BRIDGE_UNLOCK(sc); 2270 return (NULL); 2271 } 2272 2273 if ((bif->bif_flags & IFBIF_STP) && 2274 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2275 BRIDGE_UNLOCK(sc); 2276 return (m); 2277 } 2278 2279 /* 2280 * Make a deep copy of the packet and enqueue the copy 2281 * for bridge processing; return the original packet for 2282 * local processing. 2283 */ 2284 mc = m_dup(m, M_NOWAIT); 2285 if (mc == NULL) { 2286 BRIDGE_UNLOCK(sc); 2287 return (m); 2288 } 2289 2290 /* Perform the bridge forwarding function with the copy. */ 2291 bridge_forward(sc, bif, mc); 2292 2293 /* 2294 * Reinject the mbuf as arriving on the bridge so we have a 2295 * chance at claiming multicast packets. We can not loop back 2296 * here from ether_input as a bridge is never a member of a 2297 * bridge. 2298 */ 2299 KASSERT(bifp->if_bridge == NULL, 2300 ("loop created in bridge_input")); 2301 mc2 = m_dup(m, M_NOWAIT); 2302 if (mc2 != NULL) { 2303 /* Keep the layer3 header aligned */ 2304 int i = min(mc2->m_pkthdr.len, max_protohdr); 2305 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2306 } 2307 if (mc2 != NULL) { 2308 mc2->m_pkthdr.rcvif = bifp; 2309 (*bifp->if_input)(bifp, mc2); 2310 } 2311 2312 /* Return the original packet for local processing. */ 2313 return (m); 2314 } 2315 2316 if ((bif->bif_flags & IFBIF_STP) && 2317 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2318 BRIDGE_UNLOCK(sc); 2319 return (m); 2320 } 2321 2322 #if (defined(INET) || defined(INET6)) 2323 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2324 || ((iface)->if_carp \ 2325 && (*carp_forus_p)((iface), eh->ether_dhost)) 2326 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2327 || ((iface)->if_carp \ 2328 && (*carp_forus_p)((iface), eh->ether_shost)) 2329 #else 2330 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2331 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2332 #endif 2333 2334 #ifdef INET6 2335 # define OR_PFIL_HOOKED_INET6 \ 2336 || PFIL_HOOKED(&V_inet6_pfil_hook) 2337 #else 2338 # define OR_PFIL_HOOKED_INET6 2339 #endif 2340 2341 #define GRAB_OUR_PACKETS(iface) \ 2342 if ((iface)->if_type == IFT_GIF) \ 2343 continue; \ 2344 /* It is destined for us. */ \ 2345 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2346 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2347 ) { \ 2348 if ((iface)->if_type == IFT_BRIDGE) { \ 2349 ETHER_BPF_MTAP(iface, m); \ 2350 iface->if_ipackets++; \ 2351 iface->if_ibytes += m->m_pkthdr.len; \ 2352 /* Filter on the physical interface. */ \ 2353 if (pfil_local_phys && \ 2354 (PFIL_HOOKED(&V_inet_pfil_hook) \ 2355 OR_PFIL_HOOKED_INET6)) { \ 2356 if (bridge_pfil(&m, NULL, ifp, \ 2357 PFIL_IN) != 0 || m == NULL) { \ 2358 BRIDGE_UNLOCK(sc); \ 2359 return (NULL); \ 2360 } \ 2361 eh = mtod(m, struct ether_header *); \ 2362 } \ 2363 } \ 2364 if (bif->bif_flags & IFBIF_LEARNING) { \ 2365 error = bridge_rtupdate(sc, eh->ether_shost, \ 2366 vlan, bif, 0, IFBAF_DYNAMIC); \ 2367 if (error && bif->bif_addrmax) { \ 2368 BRIDGE_UNLOCK(sc); \ 2369 m_freem(m); \ 2370 return (NULL); \ 2371 } \ 2372 } \ 2373 m->m_pkthdr.rcvif = iface; \ 2374 BRIDGE_UNLOCK(sc); \ 2375 return (m); \ 2376 } \ 2377 \ 2378 /* We just received a packet that we sent out. */ \ 2379 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2380 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2381 ) { \ 2382 BRIDGE_UNLOCK(sc); \ 2383 m_freem(m); \ 2384 return (NULL); \ 2385 } 2386 2387 /* 2388 * Unicast. Make sure it's not for the bridge. 2389 */ 2390 do { GRAB_OUR_PACKETS(bifp) } while (0); 2391 2392 /* 2393 * Give a chance for ifp at first priority. This will help when the 2394 * packet comes through the interface like VLAN's with the same MACs 2395 * on several interfaces from the same bridge. This also will save 2396 * some CPU cycles in case the destination interface and the input 2397 * interface (eq ifp) are the same. 2398 */ 2399 do { GRAB_OUR_PACKETS(ifp) } while (0); 2400 2401 /* Now check the all bridge members. */ 2402 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2403 GRAB_OUR_PACKETS(bif2->bif_ifp) 2404 } 2405 2406 #undef OR_CARP_CHECK_WE_ARE_DST 2407 #undef OR_CARP_CHECK_WE_ARE_SRC 2408 #undef OR_PFIL_HOOKED_INET6 2409 #undef GRAB_OUR_PACKETS 2410 2411 /* Perform the bridge forwarding function. */ 2412 bridge_forward(sc, bif, m); 2413 2414 return (NULL); 2415 } 2416 2417 /* 2418 * bridge_broadcast: 2419 * 2420 * Send a frame to all interfaces that are members of 2421 * the bridge, except for the one on which the packet 2422 * arrived. 2423 * 2424 * NOTE: Releases the lock on return. 2425 */ 2426 static void 2427 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2428 struct mbuf *m, int runfilt) 2429 { 2430 struct bridge_iflist *dbif, *sbif; 2431 struct mbuf *mc; 2432 struct ifnet *dst_if; 2433 int error = 0, used = 0, i; 2434 2435 sbif = bridge_lookup_member_if(sc, src_if); 2436 2437 BRIDGE_LOCK2REF(sc, error); 2438 if (error) { 2439 m_freem(m); 2440 return; 2441 } 2442 2443 /* Filter on the bridge interface before broadcasting */ 2444 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2445 #ifdef INET6 2446 || PFIL_HOOKED(&V_inet6_pfil_hook) 2447 #endif 2448 )) { 2449 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2450 goto out; 2451 if (m == NULL) 2452 goto out; 2453 } 2454 2455 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2456 dst_if = dbif->bif_ifp; 2457 if (dst_if == src_if) 2458 continue; 2459 2460 /* Private segments can not talk to each other */ 2461 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2462 continue; 2463 2464 if ((dbif->bif_flags & IFBIF_STP) && 2465 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2466 continue; 2467 2468 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2469 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2470 continue; 2471 2472 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2473 continue; 2474 2475 if (LIST_NEXT(dbif, bif_next) == NULL) { 2476 mc = m; 2477 used = 1; 2478 } else { 2479 mc = m_dup(m, M_NOWAIT); 2480 if (mc == NULL) { 2481 sc->sc_ifp->if_oerrors++; 2482 continue; 2483 } 2484 } 2485 2486 /* 2487 * Filter on the output interface. Pass a NULL bridge interface 2488 * pointer so we do not redundantly filter on the bridge for 2489 * each interface we broadcast on. 2490 */ 2491 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2492 #ifdef INET6 2493 || PFIL_HOOKED(&V_inet6_pfil_hook) 2494 #endif 2495 )) { 2496 if (used == 0) { 2497 /* Keep the layer3 header aligned */ 2498 i = min(mc->m_pkthdr.len, max_protohdr); 2499 mc = m_copyup(mc, i, ETHER_ALIGN); 2500 if (mc == NULL) { 2501 sc->sc_ifp->if_oerrors++; 2502 continue; 2503 } 2504 } 2505 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2506 continue; 2507 if (mc == NULL) 2508 continue; 2509 } 2510 2511 bridge_enqueue(sc, dst_if, mc); 2512 } 2513 if (used == 0) 2514 m_freem(m); 2515 2516 out: 2517 BRIDGE_UNREF(sc); 2518 } 2519 2520 /* 2521 * bridge_span: 2522 * 2523 * Duplicate a packet out one or more interfaces that are in span mode, 2524 * the original mbuf is unmodified. 2525 */ 2526 static void 2527 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2528 { 2529 struct bridge_iflist *bif; 2530 struct ifnet *dst_if; 2531 struct mbuf *mc; 2532 2533 if (LIST_EMPTY(&sc->sc_spanlist)) 2534 return; 2535 2536 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2537 dst_if = bif->bif_ifp; 2538 2539 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2540 continue; 2541 2542 mc = m_copypacket(m, M_NOWAIT); 2543 if (mc == NULL) { 2544 sc->sc_ifp->if_oerrors++; 2545 continue; 2546 } 2547 2548 bridge_enqueue(sc, dst_if, mc); 2549 } 2550 } 2551 2552 /* 2553 * bridge_rtupdate: 2554 * 2555 * Add a bridge routing entry. 2556 */ 2557 static int 2558 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2559 struct bridge_iflist *bif, int setflags, uint8_t flags) 2560 { 2561 struct bridge_rtnode *brt; 2562 int error; 2563 2564 BRIDGE_LOCK_ASSERT(sc); 2565 2566 /* Check the source address is valid and not multicast. */ 2567 if (ETHER_IS_MULTICAST(dst) || 2568 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2569 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2570 return (EINVAL); 2571 2572 /* 802.1p frames map to vlan 1 */ 2573 if (vlan == 0) 2574 vlan = 1; 2575 2576 /* 2577 * A route for this destination might already exist. If so, 2578 * update it, otherwise create a new one. 2579 */ 2580 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2581 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2582 sc->sc_brtexceeded++; 2583 return (ENOSPC); 2584 } 2585 /* Check per interface address limits (if enabled) */ 2586 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2587 bif->bif_addrexceeded++; 2588 return (ENOSPC); 2589 } 2590 2591 /* 2592 * Allocate a new bridge forwarding node, and 2593 * initialize the expiration time and Ethernet 2594 * address. 2595 */ 2596 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2597 if (brt == NULL) 2598 return (ENOMEM); 2599 2600 if (bif->bif_flags & IFBIF_STICKY) 2601 brt->brt_flags = IFBAF_STICKY; 2602 else 2603 brt->brt_flags = IFBAF_DYNAMIC; 2604 2605 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2606 brt->brt_vlan = vlan; 2607 2608 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2609 uma_zfree(bridge_rtnode_zone, brt); 2610 return (error); 2611 } 2612 brt->brt_dst = bif; 2613 bif->bif_addrcnt++; 2614 } 2615 2616 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2617 brt->brt_dst != bif) { 2618 brt->brt_dst->bif_addrcnt--; 2619 brt->brt_dst = bif; 2620 brt->brt_dst->bif_addrcnt++; 2621 } 2622 2623 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2624 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2625 if (setflags) 2626 brt->brt_flags = flags; 2627 2628 return (0); 2629 } 2630 2631 /* 2632 * bridge_rtlookup: 2633 * 2634 * Lookup the destination interface for an address. 2635 */ 2636 static struct ifnet * 2637 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2638 { 2639 struct bridge_rtnode *brt; 2640 2641 BRIDGE_LOCK_ASSERT(sc); 2642 2643 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2644 return (NULL); 2645 2646 return (brt->brt_ifp); 2647 } 2648 2649 /* 2650 * bridge_rttrim: 2651 * 2652 * Trim the routine table so that we have a number 2653 * of routing entries less than or equal to the 2654 * maximum number. 2655 */ 2656 static void 2657 bridge_rttrim(struct bridge_softc *sc) 2658 { 2659 struct bridge_rtnode *brt, *nbrt; 2660 2661 BRIDGE_LOCK_ASSERT(sc); 2662 2663 /* Make sure we actually need to do this. */ 2664 if (sc->sc_brtcnt <= sc->sc_brtmax) 2665 return; 2666 2667 /* Force an aging cycle; this might trim enough addresses. */ 2668 bridge_rtage(sc); 2669 if (sc->sc_brtcnt <= sc->sc_brtmax) 2670 return; 2671 2672 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2673 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2674 bridge_rtnode_destroy(sc, brt); 2675 if (sc->sc_brtcnt <= sc->sc_brtmax) 2676 return; 2677 } 2678 } 2679 } 2680 2681 /* 2682 * bridge_timer: 2683 * 2684 * Aging timer for the bridge. 2685 */ 2686 static void 2687 bridge_timer(void *arg) 2688 { 2689 struct bridge_softc *sc = arg; 2690 2691 BRIDGE_LOCK_ASSERT(sc); 2692 2693 bridge_rtage(sc); 2694 2695 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2696 callout_reset(&sc->sc_brcallout, 2697 bridge_rtable_prune_period * hz, bridge_timer, sc); 2698 } 2699 2700 /* 2701 * bridge_rtage: 2702 * 2703 * Perform an aging cycle. 2704 */ 2705 static void 2706 bridge_rtage(struct bridge_softc *sc) 2707 { 2708 struct bridge_rtnode *brt, *nbrt; 2709 2710 BRIDGE_LOCK_ASSERT(sc); 2711 2712 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2713 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2714 if (time_uptime >= brt->brt_expire) 2715 bridge_rtnode_destroy(sc, brt); 2716 } 2717 } 2718 } 2719 2720 /* 2721 * bridge_rtflush: 2722 * 2723 * Remove all dynamic addresses from the bridge. 2724 */ 2725 static void 2726 bridge_rtflush(struct bridge_softc *sc, int full) 2727 { 2728 struct bridge_rtnode *brt, *nbrt; 2729 2730 BRIDGE_LOCK_ASSERT(sc); 2731 2732 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2733 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2734 bridge_rtnode_destroy(sc, brt); 2735 } 2736 } 2737 2738 /* 2739 * bridge_rtdaddr: 2740 * 2741 * Remove an address from the table. 2742 */ 2743 static int 2744 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2745 { 2746 struct bridge_rtnode *brt; 2747 int found = 0; 2748 2749 BRIDGE_LOCK_ASSERT(sc); 2750 2751 /* 2752 * If vlan is zero then we want to delete for all vlans so the lookup 2753 * may return more than one. 2754 */ 2755 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2756 bridge_rtnode_destroy(sc, brt); 2757 found = 1; 2758 } 2759 2760 return (found ? 0 : ENOENT); 2761 } 2762 2763 /* 2764 * bridge_rtdelete: 2765 * 2766 * Delete routes to a speicifc member interface. 2767 */ 2768 static void 2769 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2770 { 2771 struct bridge_rtnode *brt, *nbrt; 2772 2773 BRIDGE_LOCK_ASSERT(sc); 2774 2775 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2776 if (brt->brt_ifp == ifp && (full || 2777 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2778 bridge_rtnode_destroy(sc, brt); 2779 } 2780 } 2781 2782 /* 2783 * bridge_rtable_init: 2784 * 2785 * Initialize the route table for this bridge. 2786 */ 2787 static void 2788 bridge_rtable_init(struct bridge_softc *sc) 2789 { 2790 int i; 2791 2792 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2793 M_DEVBUF, M_WAITOK); 2794 2795 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2796 LIST_INIT(&sc->sc_rthash[i]); 2797 2798 sc->sc_rthash_key = arc4random(); 2799 LIST_INIT(&sc->sc_rtlist); 2800 } 2801 2802 /* 2803 * bridge_rtable_fini: 2804 * 2805 * Deconstruct the route table for this bridge. 2806 */ 2807 static void 2808 bridge_rtable_fini(struct bridge_softc *sc) 2809 { 2810 2811 KASSERT(sc->sc_brtcnt == 0, 2812 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2813 free(sc->sc_rthash, M_DEVBUF); 2814 } 2815 2816 /* 2817 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2818 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2819 */ 2820 #define mix(a, b, c) \ 2821 do { \ 2822 a -= b; a -= c; a ^= (c >> 13); \ 2823 b -= c; b -= a; b ^= (a << 8); \ 2824 c -= a; c -= b; c ^= (b >> 13); \ 2825 a -= b; a -= c; a ^= (c >> 12); \ 2826 b -= c; b -= a; b ^= (a << 16); \ 2827 c -= a; c -= b; c ^= (b >> 5); \ 2828 a -= b; a -= c; a ^= (c >> 3); \ 2829 b -= c; b -= a; b ^= (a << 10); \ 2830 c -= a; c -= b; c ^= (b >> 15); \ 2831 } while (/*CONSTCOND*/0) 2832 2833 static __inline uint32_t 2834 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2835 { 2836 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2837 2838 b += addr[5] << 8; 2839 b += addr[4]; 2840 a += addr[3] << 24; 2841 a += addr[2] << 16; 2842 a += addr[1] << 8; 2843 a += addr[0]; 2844 2845 mix(a, b, c); 2846 2847 return (c & BRIDGE_RTHASH_MASK); 2848 } 2849 2850 #undef mix 2851 2852 static int 2853 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2854 { 2855 int i, d; 2856 2857 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2858 d = ((int)a[i]) - ((int)b[i]); 2859 } 2860 2861 return (d); 2862 } 2863 2864 /* 2865 * bridge_rtnode_lookup: 2866 * 2867 * Look up a bridge route node for the specified destination. Compare the 2868 * vlan id or if zero then just return the first match. 2869 */ 2870 static struct bridge_rtnode * 2871 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2872 { 2873 struct bridge_rtnode *brt; 2874 uint32_t hash; 2875 int dir; 2876 2877 BRIDGE_LOCK_ASSERT(sc); 2878 2879 hash = bridge_rthash(sc, addr); 2880 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2881 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2882 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2883 return (brt); 2884 if (dir > 0) 2885 return (NULL); 2886 } 2887 2888 return (NULL); 2889 } 2890 2891 /* 2892 * bridge_rtnode_insert: 2893 * 2894 * Insert the specified bridge node into the route table. We 2895 * assume the entry is not already in the table. 2896 */ 2897 static int 2898 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2899 { 2900 struct bridge_rtnode *lbrt; 2901 uint32_t hash; 2902 int dir; 2903 2904 BRIDGE_LOCK_ASSERT(sc); 2905 2906 hash = bridge_rthash(sc, brt->brt_addr); 2907 2908 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2909 if (lbrt == NULL) { 2910 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2911 goto out; 2912 } 2913 2914 do { 2915 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2916 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2917 return (EEXIST); 2918 if (dir > 0) { 2919 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2920 goto out; 2921 } 2922 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2923 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2924 goto out; 2925 } 2926 lbrt = LIST_NEXT(lbrt, brt_hash); 2927 } while (lbrt != NULL); 2928 2929 #ifdef DIAGNOSTIC 2930 panic("bridge_rtnode_insert: impossible"); 2931 #endif 2932 2933 out: 2934 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2935 sc->sc_brtcnt++; 2936 2937 return (0); 2938 } 2939 2940 /* 2941 * bridge_rtnode_destroy: 2942 * 2943 * Destroy a bridge rtnode. 2944 */ 2945 static void 2946 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2947 { 2948 BRIDGE_LOCK_ASSERT(sc); 2949 2950 LIST_REMOVE(brt, brt_hash); 2951 2952 LIST_REMOVE(brt, brt_list); 2953 sc->sc_brtcnt--; 2954 brt->brt_dst->bif_addrcnt--; 2955 uma_zfree(bridge_rtnode_zone, brt); 2956 } 2957 2958 /* 2959 * bridge_rtable_expire: 2960 * 2961 * Set the expiry time for all routes on an interface. 2962 */ 2963 static void 2964 bridge_rtable_expire(struct ifnet *ifp, int age) 2965 { 2966 struct bridge_softc *sc = ifp->if_bridge; 2967 struct bridge_rtnode *brt; 2968 2969 BRIDGE_LOCK(sc); 2970 2971 /* 2972 * If the age is zero then flush, otherwise set all the expiry times to 2973 * age for the interface 2974 */ 2975 if (age == 0) 2976 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 2977 else { 2978 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2979 /* Cap the expiry time to 'age' */ 2980 if (brt->brt_ifp == ifp && 2981 brt->brt_expire > time_uptime + age && 2982 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2983 brt->brt_expire = time_uptime + age; 2984 } 2985 } 2986 BRIDGE_UNLOCK(sc); 2987 } 2988 2989 /* 2990 * bridge_state_change: 2991 * 2992 * Callback from the bridgestp code when a port changes states. 2993 */ 2994 static void 2995 bridge_state_change(struct ifnet *ifp, int state) 2996 { 2997 struct bridge_softc *sc = ifp->if_bridge; 2998 static const char *stpstates[] = { 2999 "disabled", 3000 "listening", 3001 "learning", 3002 "forwarding", 3003 "blocking", 3004 "discarding" 3005 }; 3006 3007 if (log_stp) 3008 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3009 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3010 } 3011 3012 /* 3013 * Send bridge packets through pfil if they are one of the types pfil can deal 3014 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3015 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3016 * that interface. 3017 */ 3018 static int 3019 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3020 { 3021 int snap, error, i, hlen; 3022 struct ether_header *eh1, eh2; 3023 struct ip *ip; 3024 struct llc llc1; 3025 u_int16_t ether_type; 3026 3027 snap = 0; 3028 error = -1; /* Default error if not error == 0 */ 3029 3030 #if 0 3031 /* we may return with the IP fields swapped, ensure its not shared */ 3032 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3033 #endif 3034 3035 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) 3036 return (0); /* filtering is disabled */ 3037 3038 i = min((*mp)->m_pkthdr.len, max_protohdr); 3039 if ((*mp)->m_len < i) { 3040 *mp = m_pullup(*mp, i); 3041 if (*mp == NULL) { 3042 printf("%s: m_pullup failed\n", __func__); 3043 return (-1); 3044 } 3045 } 3046 3047 eh1 = mtod(*mp, struct ether_header *); 3048 ether_type = ntohs(eh1->ether_type); 3049 3050 /* 3051 * Check for SNAP/LLC. 3052 */ 3053 if (ether_type < ETHERMTU) { 3054 struct llc *llc2 = (struct llc *)(eh1 + 1); 3055 3056 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3057 llc2->llc_dsap == LLC_SNAP_LSAP && 3058 llc2->llc_ssap == LLC_SNAP_LSAP && 3059 llc2->llc_control == LLC_UI) { 3060 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3061 snap = 1; 3062 } 3063 } 3064 3065 /* 3066 * If we're trying to filter bridge traffic, don't look at anything 3067 * other than IP and ARP traffic. If the filter doesn't understand 3068 * IPv6, don't allow IPv6 through the bridge either. This is lame 3069 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3070 * but of course we don't have an AppleTalk filter to begin with. 3071 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3072 * ARP traffic.) 3073 */ 3074 switch (ether_type) { 3075 case ETHERTYPE_ARP: 3076 case ETHERTYPE_REVARP: 3077 if (pfil_ipfw_arp == 0) 3078 return (0); /* Automatically pass */ 3079 break; 3080 3081 case ETHERTYPE_IP: 3082 #ifdef INET6 3083 case ETHERTYPE_IPV6: 3084 #endif /* INET6 */ 3085 break; 3086 default: 3087 /* 3088 * Check to see if the user wants to pass non-ip 3089 * packets, these will not be checked by pfil(9) and 3090 * passed unconditionally so the default is to drop. 3091 */ 3092 if (pfil_onlyip) 3093 goto bad; 3094 } 3095 3096 /* Run the packet through pfil before stripping link headers */ 3097 if (PFIL_HOOKED(&V_link_pfil_hook) && pfil_ipfw != 0 && 3098 dir == PFIL_OUT && ifp != NULL) { 3099 3100 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL); 3101 3102 if (*mp == NULL || error != 0) /* packet consumed by filter */ 3103 return (error); 3104 } 3105 3106 /* Strip off the Ethernet header and keep a copy. */ 3107 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3108 m_adj(*mp, ETHER_HDR_LEN); 3109 3110 /* Strip off snap header, if present */ 3111 if (snap) { 3112 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3113 m_adj(*mp, sizeof(struct llc)); 3114 } 3115 3116 /* 3117 * Check the IP header for alignment and errors 3118 */ 3119 if (dir == PFIL_IN) { 3120 switch (ether_type) { 3121 case ETHERTYPE_IP: 3122 error = bridge_ip_checkbasic(mp); 3123 break; 3124 #ifdef INET6 3125 case ETHERTYPE_IPV6: 3126 error = bridge_ip6_checkbasic(mp); 3127 break; 3128 #endif /* INET6 */ 3129 default: 3130 error = 0; 3131 } 3132 if (error) 3133 goto bad; 3134 } 3135 3136 error = 0; 3137 3138 /* 3139 * Run the packet through pfil 3140 */ 3141 switch (ether_type) { 3142 case ETHERTYPE_IP: 3143 /* 3144 * Run pfil on the member interface and the bridge, both can 3145 * be skipped by clearing pfil_member or pfil_bridge. 3146 * 3147 * Keep the order: 3148 * in_if -> bridge_if -> out_if 3149 */ 3150 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3151 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3152 dir, NULL); 3153 3154 if (*mp == NULL || error != 0) /* filter may consume */ 3155 break; 3156 3157 if (pfil_member && ifp != NULL) 3158 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, 3159 dir, NULL); 3160 3161 if (*mp == NULL || error != 0) /* filter may consume */ 3162 break; 3163 3164 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3165 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3166 dir, NULL); 3167 3168 if (*mp == NULL || error != 0) /* filter may consume */ 3169 break; 3170 3171 /* check if we need to fragment the packet */ 3172 if (pfil_member && ifp != NULL && dir == PFIL_OUT) { 3173 i = (*mp)->m_pkthdr.len; 3174 if (i > ifp->if_mtu) { 3175 error = bridge_fragment(ifp, *mp, &eh2, snap, 3176 &llc1); 3177 return (error); 3178 } 3179 } 3180 3181 /* Recalculate the ip checksum. */ 3182 ip = mtod(*mp, struct ip *); 3183 hlen = ip->ip_hl << 2; 3184 if (hlen < sizeof(struct ip)) 3185 goto bad; 3186 if (hlen > (*mp)->m_len) { 3187 if ((*mp = m_pullup(*mp, hlen)) == 0) 3188 goto bad; 3189 ip = mtod(*mp, struct ip *); 3190 if (ip == NULL) 3191 goto bad; 3192 } 3193 ip->ip_sum = 0; 3194 if (hlen == sizeof(struct ip)) 3195 ip->ip_sum = in_cksum_hdr(ip); 3196 else 3197 ip->ip_sum = in_cksum(*mp, hlen); 3198 3199 break; 3200 #ifdef INET6 3201 case ETHERTYPE_IPV6: 3202 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3203 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3204 dir, NULL); 3205 3206 if (*mp == NULL || error != 0) /* filter may consume */ 3207 break; 3208 3209 if (pfil_member && ifp != NULL) 3210 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp, 3211 dir, NULL); 3212 3213 if (*mp == NULL || error != 0) /* filter may consume */ 3214 break; 3215 3216 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3217 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3218 dir, NULL); 3219 break; 3220 #endif 3221 default: 3222 error = 0; 3223 break; 3224 } 3225 3226 if (*mp == NULL) 3227 return (error); 3228 if (error != 0) 3229 goto bad; 3230 3231 error = -1; 3232 3233 /* 3234 * Finally, put everything back the way it was and return 3235 */ 3236 if (snap) { 3237 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 3238 if (*mp == NULL) 3239 return (error); 3240 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3241 } 3242 3243 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 3244 if (*mp == NULL) 3245 return (error); 3246 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3247 3248 return (0); 3249 3250 bad: 3251 m_freem(*mp); 3252 *mp = NULL; 3253 return (error); 3254 } 3255 3256 /* 3257 * Perform basic checks on header size since 3258 * pfil assumes ip_input has already processed 3259 * it for it. Cut-and-pasted from ip_input.c. 3260 * Given how simple the IPv6 version is, 3261 * does the IPv4 version really need to be 3262 * this complicated? 3263 * 3264 * XXX Should we update ipstat here, or not? 3265 * XXX Right now we update ipstat but not 3266 * XXX csum_counter. 3267 */ 3268 static int 3269 bridge_ip_checkbasic(struct mbuf **mp) 3270 { 3271 struct mbuf *m = *mp; 3272 struct ip *ip; 3273 int len, hlen; 3274 u_short sum; 3275 3276 if (*mp == NULL) 3277 return (-1); 3278 3279 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3280 if ((m = m_copyup(m, sizeof(struct ip), 3281 (max_linkhdr + 3) & ~3)) == NULL) { 3282 /* XXXJRT new stat, please */ 3283 KMOD_IPSTAT_INC(ips_toosmall); 3284 goto bad; 3285 } 3286 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3287 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3288 KMOD_IPSTAT_INC(ips_toosmall); 3289 goto bad; 3290 } 3291 } 3292 ip = mtod(m, struct ip *); 3293 if (ip == NULL) goto bad; 3294 3295 if (ip->ip_v != IPVERSION) { 3296 KMOD_IPSTAT_INC(ips_badvers); 3297 goto bad; 3298 } 3299 hlen = ip->ip_hl << 2; 3300 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3301 KMOD_IPSTAT_INC(ips_badhlen); 3302 goto bad; 3303 } 3304 if (hlen > m->m_len) { 3305 if ((m = m_pullup(m, hlen)) == 0) { 3306 KMOD_IPSTAT_INC(ips_badhlen); 3307 goto bad; 3308 } 3309 ip = mtod(m, struct ip *); 3310 if (ip == NULL) goto bad; 3311 } 3312 3313 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3314 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3315 } else { 3316 if (hlen == sizeof(struct ip)) { 3317 sum = in_cksum_hdr(ip); 3318 } else { 3319 sum = in_cksum(m, hlen); 3320 } 3321 } 3322 if (sum) { 3323 KMOD_IPSTAT_INC(ips_badsum); 3324 goto bad; 3325 } 3326 3327 /* Retrieve the packet length. */ 3328 len = ntohs(ip->ip_len); 3329 3330 /* 3331 * Check for additional length bogosity 3332 */ 3333 if (len < hlen) { 3334 KMOD_IPSTAT_INC(ips_badlen); 3335 goto bad; 3336 } 3337 3338 /* 3339 * Check that the amount of data in the buffers 3340 * is as at least much as the IP header would have us expect. 3341 * Drop packet if shorter than we expect. 3342 */ 3343 if (m->m_pkthdr.len < len) { 3344 KMOD_IPSTAT_INC(ips_tooshort); 3345 goto bad; 3346 } 3347 3348 /* Checks out, proceed */ 3349 *mp = m; 3350 return (0); 3351 3352 bad: 3353 *mp = m; 3354 return (-1); 3355 } 3356 3357 #ifdef INET6 3358 /* 3359 * Same as above, but for IPv6. 3360 * Cut-and-pasted from ip6_input.c. 3361 * XXX Should we update ip6stat, or not? 3362 */ 3363 static int 3364 bridge_ip6_checkbasic(struct mbuf **mp) 3365 { 3366 struct mbuf *m = *mp; 3367 struct ip6_hdr *ip6; 3368 3369 /* 3370 * If the IPv6 header is not aligned, slurp it up into a new 3371 * mbuf with space for link headers, in the event we forward 3372 * it. Otherwise, if it is aligned, make sure the entire base 3373 * IPv6 header is in the first mbuf of the chain. 3374 */ 3375 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3376 struct ifnet *inifp = m->m_pkthdr.rcvif; 3377 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3378 (max_linkhdr + 3) & ~3)) == NULL) { 3379 /* XXXJRT new stat, please */ 3380 IP6STAT_INC(ip6s_toosmall); 3381 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3382 goto bad; 3383 } 3384 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3385 struct ifnet *inifp = m->m_pkthdr.rcvif; 3386 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3387 IP6STAT_INC(ip6s_toosmall); 3388 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3389 goto bad; 3390 } 3391 } 3392 3393 ip6 = mtod(m, struct ip6_hdr *); 3394 3395 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3396 IP6STAT_INC(ip6s_badvers); 3397 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3398 goto bad; 3399 } 3400 3401 /* Checks out, proceed */ 3402 *mp = m; 3403 return (0); 3404 3405 bad: 3406 *mp = m; 3407 return (-1); 3408 } 3409 #endif /* INET6 */ 3410 3411 /* 3412 * bridge_fragment: 3413 * 3414 * Return a fragmented mbuf chain. 3415 */ 3416 static int 3417 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, 3418 int snap, struct llc *llc) 3419 { 3420 struct mbuf *m0; 3421 struct ip *ip; 3422 int error = -1; 3423 3424 if (m->m_len < sizeof(struct ip) && 3425 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3426 goto out; 3427 ip = mtod(m, struct ip *); 3428 3429 m->m_pkthdr.csum_flags |= CSUM_IP; 3430 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 3431 if (error) 3432 goto out; 3433 3434 /* walk the chain and re-add the Ethernet header */ 3435 for (m0 = m; m0; m0 = m0->m_nextpkt) { 3436 if (error == 0) { 3437 if (snap) { 3438 M_PREPEND(m0, sizeof(struct llc), M_NOWAIT); 3439 if (m0 == NULL) { 3440 error = ENOBUFS; 3441 continue; 3442 } 3443 bcopy(llc, mtod(m0, caddr_t), 3444 sizeof(struct llc)); 3445 } 3446 M_PREPEND(m0, ETHER_HDR_LEN, M_NOWAIT); 3447 if (m0 == NULL) { 3448 error = ENOBUFS; 3449 continue; 3450 } 3451 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); 3452 } else 3453 m_freem(m); 3454 } 3455 3456 if (error == 0) 3457 KMOD_IPSTAT_INC(ips_fragmented); 3458 3459 return (error); 3460 3461 out: 3462 if (m != NULL) 3463 m_freem(m); 3464 return (error); 3465 } 3466 3467 static void 3468 bridge_linkstate(struct ifnet *ifp) 3469 { 3470 struct bridge_softc *sc = ifp->if_bridge; 3471 struct bridge_iflist *bif; 3472 3473 BRIDGE_LOCK(sc); 3474 bif = bridge_lookup_member_if(sc, ifp); 3475 if (bif == NULL) { 3476 BRIDGE_UNLOCK(sc); 3477 return; 3478 } 3479 bridge_linkcheck(sc); 3480 BRIDGE_UNLOCK(sc); 3481 3482 bstp_linkstate(&bif->bif_stp); 3483 } 3484 3485 static void 3486 bridge_linkcheck(struct bridge_softc *sc) 3487 { 3488 struct bridge_iflist *bif; 3489 int new_link, hasls; 3490 3491 BRIDGE_LOCK_ASSERT(sc); 3492 new_link = LINK_STATE_DOWN; 3493 hasls = 0; 3494 /* Our link is considered up if at least one of our ports is active */ 3495 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3496 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3497 hasls++; 3498 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3499 new_link = LINK_STATE_UP; 3500 break; 3501 } 3502 } 3503 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3504 /* If no interfaces support link-state then we default to up */ 3505 new_link = LINK_STATE_UP; 3506 } 3507 if_link_state_change(sc->sc_ifp, new_link); 3508 } 3509