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/mbuf.h> 85 #include <sys/malloc.h> 86 #include <sys/protosw.h> 87 #include <sys/systm.h> 88 #include <sys/jail.h> 89 #include <sys/time.h> 90 #include <sys/socket.h> /* for net/if.h */ 91 #include <sys/sockio.h> 92 #include <sys/ctype.h> /* string functions */ 93 #include <sys/kernel.h> 94 #include <sys/random.h> 95 #include <sys/syslog.h> 96 #include <sys/sysctl.h> 97 #include <vm/uma.h> 98 #include <sys/module.h> 99 #include <sys/priv.h> 100 #include <sys/proc.h> 101 #include <sys/lock.h> 102 #include <sys/mutex.h> 103 104 #include <net/bpf.h> 105 #include <net/if.h> 106 #include <net/if_clone.h> 107 #include <net/if_dl.h> 108 #include <net/if_types.h> 109 #include <net/if_var.h> 110 #include <net/pfil.h> 111 #include <net/vnet.h> 112 113 #include <netinet/in.h> /* for struct arpcom */ 114 #include <netinet/in_systm.h> 115 #include <netinet/in_var.h> 116 #include <netinet/ip.h> 117 #include <netinet/ip_var.h> 118 #ifdef INET6 119 #include <netinet/ip6.h> 120 #include <netinet6/ip6_var.h> 121 #include <netinet6/in6_ifattach.h> 122 #endif 123 #if defined(INET) || defined(INET6) 124 #include <netinet/ip_carp.h> 125 #endif 126 #include <machine/in_cksum.h> 127 #include <netinet/if_ether.h> /* for struct arpcom */ 128 #include <net/bridgestp.h> 129 #include <net/if_bridgevar.h> 130 #include <net/if_llc.h> 131 #include <net/if_vlan_var.h> 132 133 #include <net/route.h> 134 135 /* 136 * Size of the route hash table. Must be a power of two. 137 */ 138 #ifndef BRIDGE_RTHASH_SIZE 139 #define BRIDGE_RTHASH_SIZE 1024 140 #endif 141 142 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 143 144 /* 145 * Default maximum number of addresses to cache. 146 */ 147 #ifndef BRIDGE_RTABLE_MAX 148 #define BRIDGE_RTABLE_MAX 2000 149 #endif 150 151 /* 152 * Timeout (in seconds) for entries learned dynamically. 153 */ 154 #ifndef BRIDGE_RTABLE_TIMEOUT 155 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 156 #endif 157 158 /* 159 * Number of seconds between walks of the route list. 160 */ 161 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 162 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 163 #endif 164 165 /* 166 * List of capabilities to possibly mask on the member interface. 167 */ 168 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM) 169 170 /* 171 * List of capabilities to strip 172 */ 173 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 174 175 /* 176 * Bridge interface list entry. 177 */ 178 struct bridge_iflist { 179 LIST_ENTRY(bridge_iflist) bif_next; 180 struct ifnet *bif_ifp; /* member if */ 181 struct bstp_port bif_stp; /* STP state */ 182 uint32_t bif_flags; /* member if flags */ 183 int bif_savedcaps; /* saved capabilities */ 184 uint32_t bif_addrmax; /* max # of addresses */ 185 uint32_t bif_addrcnt; /* cur. # of addresses */ 186 uint32_t bif_addrexceeded;/* # of address violations */ 187 }; 188 189 /* 190 * Bridge route node. 191 */ 192 struct bridge_rtnode { 193 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 194 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 195 struct bridge_iflist *brt_dst; /* destination if */ 196 unsigned long brt_expire; /* expiration time */ 197 uint8_t brt_flags; /* address flags */ 198 uint8_t brt_addr[ETHER_ADDR_LEN]; 199 uint16_t brt_vlan; /* vlan id */ 200 }; 201 #define brt_ifp brt_dst->bif_ifp 202 203 /* 204 * Software state for each bridge. 205 */ 206 struct bridge_softc { 207 struct ifnet *sc_ifp; /* make this an interface */ 208 LIST_ENTRY(bridge_softc) sc_list; 209 struct mtx sc_mtx; 210 struct cv sc_cv; 211 uint32_t sc_brtmax; /* max # of addresses */ 212 uint32_t sc_brtcnt; /* cur. # of addresses */ 213 uint32_t sc_brttimeout; /* rt timeout in seconds */ 214 struct callout sc_brcallout; /* bridge callout */ 215 uint32_t sc_iflist_ref; /* refcount for sc_iflist */ 216 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ 217 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 218 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 219 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 220 uint32_t sc_rthash_key; /* key for hash */ 221 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 222 struct bstp_state sc_stp; /* STP state */ 223 uint32_t sc_brtexceeded; /* # of cache drops */ 224 struct ifnet *sc_ifaddr; /* member mac copied from */ 225 u_char sc_defaddr[6]; /* Default MAC address */ 226 }; 227 228 static struct mtx bridge_list_mtx; 229 eventhandler_tag bridge_detach_cookie = NULL; 230 231 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 232 233 uma_zone_t bridge_rtnode_zone; 234 235 static int bridge_clone_create(struct if_clone *, int, caddr_t); 236 static void bridge_clone_destroy(struct ifnet *); 237 238 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 239 static void bridge_mutecaps(struct bridge_softc *); 240 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 241 int); 242 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 243 static void bridge_init(void *); 244 static void bridge_dummynet(struct mbuf *, struct ifnet *); 245 static void bridge_stop(struct ifnet *, int); 246 static int bridge_transmit(struct ifnet *, struct mbuf *); 247 static void bridge_qflush(struct ifnet *); 248 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 249 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 250 struct rtentry *); 251 static int bridge_enqueue(struct bridge_softc *, struct ifnet *, 252 struct mbuf *); 253 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 254 255 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 256 struct mbuf *m); 257 258 static void bridge_timer(void *); 259 260 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 261 struct mbuf *, int); 262 static void bridge_span(struct bridge_softc *, struct mbuf *); 263 264 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 265 uint16_t, struct bridge_iflist *, int, uint8_t); 266 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 267 uint16_t); 268 static void bridge_rttrim(struct bridge_softc *); 269 static void bridge_rtage(struct bridge_softc *); 270 static void bridge_rtflush(struct bridge_softc *, int); 271 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 272 uint16_t); 273 274 static void bridge_rtable_init(struct bridge_softc *); 275 static void bridge_rtable_fini(struct bridge_softc *); 276 277 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 278 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 279 const uint8_t *, uint16_t); 280 static int bridge_rtnode_insert(struct bridge_softc *, 281 struct bridge_rtnode *); 282 static void bridge_rtnode_destroy(struct bridge_softc *, 283 struct bridge_rtnode *); 284 static void bridge_rtable_expire(struct ifnet *, int); 285 static void bridge_state_change(struct ifnet *, int); 286 287 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 288 const char *name); 289 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 290 struct ifnet *ifp); 291 static void bridge_delete_member(struct bridge_softc *, 292 struct bridge_iflist *, int); 293 static void bridge_delete_span(struct bridge_softc *, 294 struct bridge_iflist *); 295 296 static int bridge_ioctl_add(struct bridge_softc *, void *); 297 static int bridge_ioctl_del(struct bridge_softc *, void *); 298 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 299 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 300 static int bridge_ioctl_scache(struct bridge_softc *, void *); 301 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 302 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 303 static int bridge_ioctl_rts(struct bridge_softc *, void *); 304 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 305 static int bridge_ioctl_sto(struct bridge_softc *, void *); 306 static int bridge_ioctl_gto(struct bridge_softc *, void *); 307 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 308 static int bridge_ioctl_flush(struct bridge_softc *, void *); 309 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 310 static int bridge_ioctl_spri(struct bridge_softc *, void *); 311 static int bridge_ioctl_ght(struct bridge_softc *, void *); 312 static int bridge_ioctl_sht(struct bridge_softc *, void *); 313 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 314 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 315 static int bridge_ioctl_gma(struct bridge_softc *, void *); 316 static int bridge_ioctl_sma(struct bridge_softc *, void *); 317 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 318 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 319 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 320 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 321 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 322 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 323 static int bridge_ioctl_grte(struct bridge_softc *, void *); 324 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 325 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 326 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 327 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 328 int); 329 static int bridge_ip_checkbasic(struct mbuf **mp); 330 #ifdef INET6 331 static int bridge_ip6_checkbasic(struct mbuf **mp); 332 #endif /* INET6 */ 333 static int bridge_fragment(struct ifnet *, struct mbuf *, 334 struct ether_header *, int, struct llc *); 335 static void bridge_linkstate(struct ifnet *ifp); 336 static void bridge_linkcheck(struct bridge_softc *sc); 337 338 extern void (*bridge_linkstate_p)(struct ifnet *ifp); 339 340 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 341 #define VLANTAGOF(_m) \ 342 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 343 344 static struct bstp_cb_ops bridge_ops = { 345 .bcb_state = bridge_state_change, 346 .bcb_rtage = bridge_rtable_expire 347 }; 348 349 SYSCTL_DECL(_net_link); 350 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 351 352 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */ 353 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */ 354 static int pfil_member = 1; /* run pfil hooks on the member interface */ 355 static int pfil_ipfw = 0; /* layer2 filter with ipfw */ 356 static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */ 357 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for 358 locally destined packets */ 359 static int log_stp = 0; /* log STP state changes */ 360 static int bridge_inherit_mac = 0; /* share MAC with first bridge member */ 361 TUNABLE_INT("net.link.bridge.pfil_onlyip", &pfil_onlyip); 362 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW, 363 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled"); 364 TUNABLE_INT("net.link.bridge.ipfw_arp", &pfil_ipfw_arp); 365 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW, 366 &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2"); 367 TUNABLE_INT("net.link.bridge.pfil_bridge", &pfil_bridge); 368 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW, 369 &pfil_bridge, 0, "Packet filter on the bridge interface"); 370 TUNABLE_INT("net.link.bridge.pfil_member", &pfil_member); 371 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW, 372 &pfil_member, 0, "Packet filter on the member interface"); 373 TUNABLE_INT("net.link.bridge.pfil_local_phys", &pfil_local_phys); 374 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW, 375 &pfil_local_phys, 0, 376 "Packet filter on the physical interface for locally destined packets"); 377 TUNABLE_INT("net.link.bridge.log_stp", &log_stp); 378 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW, 379 &log_stp, 0, "Log STP state changes"); 380 TUNABLE_INT("net.link.bridge.inherit_mac", &bridge_inherit_mac); 381 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW, 382 &bridge_inherit_mac, 0, 383 "Inherit MAC address from the first bridge member"); 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: %lu(%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 (in6ifa_llaonifp(sc->sc_ifp) != NULL) { 1068 /* 1069 * If any, remove all inet6 addresses from the member 1070 * interfaces. 1071 */ 1072 BRIDGE_XLOCK(sc); 1073 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1074 if (in6ifa_llaonifp(bif->bif_ifp)) { 1075 BRIDGE_UNLOCK(sc); 1076 in6_ifdetach(bif->bif_ifp); 1077 BRIDGE_LOCK(sc); 1078 if_printf(sc->sc_ifp, 1079 "IPv6 addresses on %s have been removed " 1080 "before adding it as a member to prevent " 1081 "IPv6 address scope violation.\n", 1082 bif->bif_ifp->if_xname); 1083 } 1084 } 1085 BRIDGE_XDROP(sc); 1086 if (in6ifa_llaonifp(ifs)) { 1087 BRIDGE_UNLOCK(sc); 1088 in6_ifdetach(ifs); 1089 BRIDGE_LOCK(sc); 1090 if_printf(sc->sc_ifp, 1091 "IPv6 addresses on %s have been removed " 1092 "before adding it as a member to prevent " 1093 "IPv6 address scope violation.\n", 1094 ifs->if_xname); 1095 } 1096 } else { 1097 struct in6_ifaddr *ia6_m, *ia6_s; 1098 /* 1099 * If not, check whether one of the existing member 1100 * interfaces have inet6 address. If any, remove 1101 * inet6 addresses on the interface to be added. 1102 */ 1103 ia6_m = NULL; 1104 BRIDGE_XLOCK(sc); 1105 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1106 ia6_m = in6ifa_llaonifp(bif->bif_ifp); 1107 if (ia6_m != NULL) 1108 break; 1109 } 1110 BRIDGE_XDROP(sc); 1111 ia6_s = in6ifa_llaonifp(ifs); 1112 1113 if (ia6_m != NULL && ia6_s != NULL) { 1114 BRIDGE_UNLOCK(sc); 1115 in6_ifdetach(ifs); 1116 BRIDGE_LOCK(sc); 1117 if_printf(sc->sc_ifp, "IPv6 addresses on %s have " 1118 "been removed before adding it as a member " 1119 "to prevent IPv6 address scope violation.\n", 1120 ifs->if_xname); 1121 } 1122 } 1123 #endif 1124 /* Allow the first Ethernet member to define the MTU */ 1125 if (LIST_EMPTY(&sc->sc_iflist)) 1126 sc->sc_ifp->if_mtu = ifs->if_mtu; 1127 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1128 if_printf(sc->sc_ifp, "invalid MTU: %lu(%s) != %lu\n", 1129 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu); 1130 return (EINVAL); 1131 } 1132 1133 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1134 if (bif == NULL) 1135 return (ENOMEM); 1136 1137 bif->bif_ifp = ifs; 1138 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1139 bif->bif_savedcaps = ifs->if_capenable; 1140 1141 /* 1142 * Assign the interface's MAC address to the bridge if it's the first 1143 * member and the MAC address of the bridge has not been changed from 1144 * the default randomly generated one. 1145 */ 1146 if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) && 1147 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) { 1148 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1149 sc->sc_ifaddr = ifs; 1150 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1151 } 1152 1153 ifs->if_bridge = sc; 1154 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1155 /* 1156 * XXX: XLOCK HERE!?! 1157 * 1158 * NOTE: insert_***HEAD*** should be safe for the traversals. 1159 */ 1160 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1161 1162 /* Set interface capabilities to the intersection set of all members */ 1163 bridge_mutecaps(sc); 1164 bridge_linkcheck(sc); 1165 1166 /* Place the interface into promiscuous mode */ 1167 switch (ifs->if_type) { 1168 case IFT_ETHER: 1169 case IFT_L2VLAN: 1170 BRIDGE_UNLOCK(sc); 1171 error = ifpromisc(ifs, 1); 1172 BRIDGE_LOCK(sc); 1173 break; 1174 } 1175 1176 if (error) { 1177 bridge_delete_member(sc, bif, 0); 1178 free(bif, M_DEVBUF); 1179 } 1180 return (error); 1181 } 1182 1183 static int 1184 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1185 { 1186 struct ifbreq *req = arg; 1187 struct bridge_iflist *bif; 1188 1189 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1190 if (bif == NULL) 1191 return (ENOENT); 1192 1193 bridge_delete_member(sc, bif, 0); 1194 1195 return (0); 1196 } 1197 1198 static int 1199 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1200 { 1201 struct ifbreq *req = arg; 1202 struct bridge_iflist *bif; 1203 struct bstp_port *bp; 1204 1205 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1206 if (bif == NULL) 1207 return (ENOENT); 1208 1209 bp = &bif->bif_stp; 1210 req->ifbr_ifsflags = bif->bif_flags; 1211 req->ifbr_state = bp->bp_state; 1212 req->ifbr_priority = bp->bp_priority; 1213 req->ifbr_path_cost = bp->bp_path_cost; 1214 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1215 req->ifbr_proto = bp->bp_protover; 1216 req->ifbr_role = bp->bp_role; 1217 req->ifbr_stpflags = bp->bp_flags; 1218 req->ifbr_addrcnt = bif->bif_addrcnt; 1219 req->ifbr_addrmax = bif->bif_addrmax; 1220 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1221 1222 /* Copy STP state options as flags */ 1223 if (bp->bp_operedge) 1224 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1225 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1226 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1227 if (bp->bp_ptp_link) 1228 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1229 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1230 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1231 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1232 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1233 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1234 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1235 return (0); 1236 } 1237 1238 static int 1239 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1240 { 1241 struct ifbreq *req = arg; 1242 struct bridge_iflist *bif; 1243 struct bstp_port *bp; 1244 int error; 1245 1246 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1247 if (bif == NULL) 1248 return (ENOENT); 1249 bp = &bif->bif_stp; 1250 1251 if (req->ifbr_ifsflags & IFBIF_SPAN) 1252 /* SPAN is readonly */ 1253 return (EINVAL); 1254 1255 if (req->ifbr_ifsflags & IFBIF_STP) { 1256 if ((bif->bif_flags & IFBIF_STP) == 0) { 1257 error = bstp_enable(&bif->bif_stp); 1258 if (error) 1259 return (error); 1260 } 1261 } else { 1262 if ((bif->bif_flags & IFBIF_STP) != 0) 1263 bstp_disable(&bif->bif_stp); 1264 } 1265 1266 /* Pass on STP flags */ 1267 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1268 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1269 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1270 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1271 1272 /* Save the bits relating to the bridge */ 1273 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1274 1275 return (0); 1276 } 1277 1278 static int 1279 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1280 { 1281 struct ifbrparam *param = arg; 1282 1283 sc->sc_brtmax = param->ifbrp_csize; 1284 bridge_rttrim(sc); 1285 1286 return (0); 1287 } 1288 1289 static int 1290 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1291 { 1292 struct ifbrparam *param = arg; 1293 1294 param->ifbrp_csize = sc->sc_brtmax; 1295 1296 return (0); 1297 } 1298 1299 static int 1300 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1301 { 1302 struct ifbifconf *bifc = arg; 1303 struct bridge_iflist *bif; 1304 struct ifbreq breq; 1305 char *buf, *outbuf; 1306 int count, buflen, len, error = 0; 1307 1308 count = 0; 1309 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1310 count++; 1311 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1312 count++; 1313 1314 buflen = sizeof(breq) * count; 1315 if (bifc->ifbic_len == 0) { 1316 bifc->ifbic_len = buflen; 1317 return (0); 1318 } 1319 BRIDGE_UNLOCK(sc); 1320 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1321 BRIDGE_LOCK(sc); 1322 1323 count = 0; 1324 buf = outbuf; 1325 len = min(bifc->ifbic_len, buflen); 1326 bzero(&breq, sizeof(breq)); 1327 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1328 if (len < sizeof(breq)) 1329 break; 1330 1331 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1332 sizeof(breq.ifbr_ifsname)); 1333 /* Fill in the ifbreq structure */ 1334 error = bridge_ioctl_gifflags(sc, &breq); 1335 if (error) 1336 break; 1337 memcpy(buf, &breq, sizeof(breq)); 1338 count++; 1339 buf += sizeof(breq); 1340 len -= sizeof(breq); 1341 } 1342 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1343 if (len < sizeof(breq)) 1344 break; 1345 1346 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1347 sizeof(breq.ifbr_ifsname)); 1348 breq.ifbr_ifsflags = bif->bif_flags; 1349 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1350 memcpy(buf, &breq, sizeof(breq)); 1351 count++; 1352 buf += sizeof(breq); 1353 len -= sizeof(breq); 1354 } 1355 1356 BRIDGE_UNLOCK(sc); 1357 bifc->ifbic_len = sizeof(breq) * count; 1358 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1359 BRIDGE_LOCK(sc); 1360 free(outbuf, M_TEMP); 1361 return (error); 1362 } 1363 1364 static int 1365 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1366 { 1367 struct ifbaconf *bac = arg; 1368 struct bridge_rtnode *brt; 1369 struct ifbareq bareq; 1370 char *buf, *outbuf; 1371 int count, buflen, len, error = 0; 1372 1373 if (bac->ifbac_len == 0) 1374 return (0); 1375 1376 count = 0; 1377 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1378 count++; 1379 buflen = sizeof(bareq) * count; 1380 1381 BRIDGE_UNLOCK(sc); 1382 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1383 BRIDGE_LOCK(sc); 1384 1385 count = 0; 1386 buf = outbuf; 1387 len = min(bac->ifbac_len, buflen); 1388 bzero(&bareq, sizeof(bareq)); 1389 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1390 if (len < sizeof(bareq)) 1391 goto out; 1392 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1393 sizeof(bareq.ifba_ifsname)); 1394 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1395 bareq.ifba_vlan = brt->brt_vlan; 1396 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1397 time_uptime < brt->brt_expire) 1398 bareq.ifba_expire = brt->brt_expire - time_uptime; 1399 else 1400 bareq.ifba_expire = 0; 1401 bareq.ifba_flags = brt->brt_flags; 1402 1403 memcpy(buf, &bareq, sizeof(bareq)); 1404 count++; 1405 buf += sizeof(bareq); 1406 len -= sizeof(bareq); 1407 } 1408 out: 1409 BRIDGE_UNLOCK(sc); 1410 bac->ifbac_len = sizeof(bareq) * count; 1411 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1412 BRIDGE_LOCK(sc); 1413 free(outbuf, M_TEMP); 1414 return (error); 1415 } 1416 1417 static int 1418 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1419 { 1420 struct ifbareq *req = arg; 1421 struct bridge_iflist *bif; 1422 int error; 1423 1424 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1425 if (bif == NULL) 1426 return (ENOENT); 1427 1428 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1429 req->ifba_flags); 1430 1431 return (error); 1432 } 1433 1434 static int 1435 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1436 { 1437 struct ifbrparam *param = arg; 1438 1439 sc->sc_brttimeout = param->ifbrp_ctime; 1440 return (0); 1441 } 1442 1443 static int 1444 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1445 { 1446 struct ifbrparam *param = arg; 1447 1448 param->ifbrp_ctime = sc->sc_brttimeout; 1449 return (0); 1450 } 1451 1452 static int 1453 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1454 { 1455 struct ifbareq *req = arg; 1456 1457 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1458 } 1459 1460 static int 1461 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1462 { 1463 struct ifbreq *req = arg; 1464 1465 bridge_rtflush(sc, req->ifbr_ifsflags); 1466 return (0); 1467 } 1468 1469 static int 1470 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1471 { 1472 struct ifbrparam *param = arg; 1473 struct bstp_state *bs = &sc->sc_stp; 1474 1475 param->ifbrp_prio = bs->bs_bridge_priority; 1476 return (0); 1477 } 1478 1479 static int 1480 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1481 { 1482 struct ifbrparam *param = arg; 1483 1484 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1485 } 1486 1487 static int 1488 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1489 { 1490 struct ifbrparam *param = arg; 1491 struct bstp_state *bs = &sc->sc_stp; 1492 1493 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1494 return (0); 1495 } 1496 1497 static int 1498 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1499 { 1500 struct ifbrparam *param = arg; 1501 1502 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1503 } 1504 1505 static int 1506 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1507 { 1508 struct ifbrparam *param = arg; 1509 struct bstp_state *bs = &sc->sc_stp; 1510 1511 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1512 return (0); 1513 } 1514 1515 static int 1516 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1517 { 1518 struct ifbrparam *param = arg; 1519 1520 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1521 } 1522 1523 static int 1524 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1525 { 1526 struct ifbrparam *param = arg; 1527 struct bstp_state *bs = &sc->sc_stp; 1528 1529 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1530 return (0); 1531 } 1532 1533 static int 1534 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1535 { 1536 struct ifbrparam *param = arg; 1537 1538 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1539 } 1540 1541 static int 1542 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1543 { 1544 struct ifbreq *req = arg; 1545 struct bridge_iflist *bif; 1546 1547 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1548 if (bif == NULL) 1549 return (ENOENT); 1550 1551 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1552 } 1553 1554 static int 1555 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1556 { 1557 struct ifbreq *req = arg; 1558 struct bridge_iflist *bif; 1559 1560 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1561 if (bif == NULL) 1562 return (ENOENT); 1563 1564 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1565 } 1566 1567 static int 1568 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1569 { 1570 struct ifbreq *req = arg; 1571 struct bridge_iflist *bif; 1572 1573 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1574 if (bif == NULL) 1575 return (ENOENT); 1576 1577 bif->bif_addrmax = req->ifbr_addrmax; 1578 return (0); 1579 } 1580 1581 static int 1582 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1583 { 1584 struct ifbreq *req = arg; 1585 struct bridge_iflist *bif = NULL; 1586 struct ifnet *ifs; 1587 1588 ifs = ifunit(req->ifbr_ifsname); 1589 if (ifs == NULL) 1590 return (ENOENT); 1591 1592 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1593 if (ifs == bif->bif_ifp) 1594 return (EBUSY); 1595 1596 if (ifs->if_bridge != NULL) 1597 return (EBUSY); 1598 1599 switch (ifs->if_type) { 1600 case IFT_ETHER: 1601 case IFT_GIF: 1602 case IFT_L2VLAN: 1603 break; 1604 default: 1605 return (EINVAL); 1606 } 1607 1608 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1609 if (bif == NULL) 1610 return (ENOMEM); 1611 1612 bif->bif_ifp = ifs; 1613 bif->bif_flags = IFBIF_SPAN; 1614 1615 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1616 1617 return (0); 1618 } 1619 1620 static int 1621 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1622 { 1623 struct ifbreq *req = arg; 1624 struct bridge_iflist *bif; 1625 struct ifnet *ifs; 1626 1627 ifs = ifunit(req->ifbr_ifsname); 1628 if (ifs == NULL) 1629 return (ENOENT); 1630 1631 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1632 if (ifs == bif->bif_ifp) 1633 break; 1634 1635 if (bif == NULL) 1636 return (ENOENT); 1637 1638 bridge_delete_span(sc, bif); 1639 1640 return (0); 1641 } 1642 1643 static int 1644 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1645 { 1646 struct ifbropreq *req = arg; 1647 struct bstp_state *bs = &sc->sc_stp; 1648 struct bstp_port *root_port; 1649 1650 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1651 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1652 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1653 1654 root_port = bs->bs_root_port; 1655 if (root_port == NULL) 1656 req->ifbop_root_port = 0; 1657 else 1658 req->ifbop_root_port = root_port->bp_ifp->if_index; 1659 1660 req->ifbop_holdcount = bs->bs_txholdcount; 1661 req->ifbop_priority = bs->bs_bridge_priority; 1662 req->ifbop_protocol = bs->bs_protover; 1663 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1664 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1665 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1666 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1667 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1668 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1669 1670 return (0); 1671 } 1672 1673 static int 1674 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1675 { 1676 struct ifbrparam *param = arg; 1677 1678 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1679 return (0); 1680 } 1681 1682 static int 1683 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1684 { 1685 struct ifbpstpconf *bifstp = arg; 1686 struct bridge_iflist *bif; 1687 struct bstp_port *bp; 1688 struct ifbpstpreq bpreq; 1689 char *buf, *outbuf; 1690 int count, buflen, len, error = 0; 1691 1692 count = 0; 1693 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1694 if ((bif->bif_flags & IFBIF_STP) != 0) 1695 count++; 1696 } 1697 1698 buflen = sizeof(bpreq) * count; 1699 if (bifstp->ifbpstp_len == 0) { 1700 bifstp->ifbpstp_len = buflen; 1701 return (0); 1702 } 1703 1704 BRIDGE_UNLOCK(sc); 1705 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1706 BRIDGE_LOCK(sc); 1707 1708 count = 0; 1709 buf = outbuf; 1710 len = min(bifstp->ifbpstp_len, buflen); 1711 bzero(&bpreq, sizeof(bpreq)); 1712 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1713 if (len < sizeof(bpreq)) 1714 break; 1715 1716 if ((bif->bif_flags & IFBIF_STP) == 0) 1717 continue; 1718 1719 bp = &bif->bif_stp; 1720 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1721 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1722 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1723 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1724 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1725 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1726 1727 memcpy(buf, &bpreq, sizeof(bpreq)); 1728 count++; 1729 buf += sizeof(bpreq); 1730 len -= sizeof(bpreq); 1731 } 1732 1733 BRIDGE_UNLOCK(sc); 1734 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1735 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1736 BRIDGE_LOCK(sc); 1737 free(outbuf, M_TEMP); 1738 return (error); 1739 } 1740 1741 static int 1742 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1743 { 1744 struct ifbrparam *param = arg; 1745 1746 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1747 } 1748 1749 static int 1750 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1751 { 1752 struct ifbrparam *param = arg; 1753 1754 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1755 } 1756 1757 /* 1758 * bridge_ifdetach: 1759 * 1760 * Detach an interface from a bridge. Called when a member 1761 * interface is detaching. 1762 */ 1763 static void 1764 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1765 { 1766 struct bridge_softc *sc = ifp->if_bridge; 1767 struct bridge_iflist *bif; 1768 1769 if (ifp->if_flags & IFF_RENAMING) 1770 return; 1771 1772 /* Check if the interface is a bridge member */ 1773 if (sc != NULL) { 1774 BRIDGE_LOCK(sc); 1775 1776 bif = bridge_lookup_member_if(sc, ifp); 1777 if (bif != NULL) 1778 bridge_delete_member(sc, bif, 1); 1779 1780 BRIDGE_UNLOCK(sc); 1781 return; 1782 } 1783 1784 /* Check if the interface is a span port */ 1785 mtx_lock(&bridge_list_mtx); 1786 LIST_FOREACH(sc, &bridge_list, sc_list) { 1787 BRIDGE_LOCK(sc); 1788 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1789 if (ifp == bif->bif_ifp) { 1790 bridge_delete_span(sc, bif); 1791 break; 1792 } 1793 1794 BRIDGE_UNLOCK(sc); 1795 } 1796 mtx_unlock(&bridge_list_mtx); 1797 } 1798 1799 /* 1800 * bridge_init: 1801 * 1802 * Initialize a bridge interface. 1803 */ 1804 static void 1805 bridge_init(void *xsc) 1806 { 1807 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1808 struct ifnet *ifp = sc->sc_ifp; 1809 1810 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1811 return; 1812 1813 BRIDGE_LOCK(sc); 1814 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1815 bridge_timer, sc); 1816 1817 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1818 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1819 1820 BRIDGE_UNLOCK(sc); 1821 } 1822 1823 /* 1824 * bridge_stop: 1825 * 1826 * Stop the bridge interface. 1827 */ 1828 static void 1829 bridge_stop(struct ifnet *ifp, int disable) 1830 { 1831 struct bridge_softc *sc = ifp->if_softc; 1832 1833 BRIDGE_LOCK_ASSERT(sc); 1834 1835 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1836 return; 1837 1838 callout_stop(&sc->sc_brcallout); 1839 bstp_stop(&sc->sc_stp); 1840 1841 bridge_rtflush(sc, IFBF_FLUSHDYN); 1842 1843 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1844 } 1845 1846 /* 1847 * bridge_enqueue: 1848 * 1849 * Enqueue a packet on a bridge member interface. 1850 * 1851 */ 1852 static int 1853 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1854 { 1855 int len, err = 0; 1856 short mflags; 1857 struct mbuf *m0; 1858 1859 /* We may be sending a fragment so traverse the mbuf */ 1860 for (; m; m = m0) { 1861 m0 = m->m_nextpkt; 1862 m->m_nextpkt = NULL; 1863 len = m->m_pkthdr.len; 1864 mflags = m->m_flags; 1865 1866 /* 1867 * If underlying interface can not do VLAN tag insertion itself 1868 * then attach a packet tag that holds it. 1869 */ 1870 if ((m->m_flags & M_VLANTAG) && 1871 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1872 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1873 if (m == NULL) { 1874 if_printf(dst_ifp, 1875 "unable to prepend VLAN header\n"); 1876 dst_ifp->if_oerrors++; 1877 continue; 1878 } 1879 m->m_flags &= ~M_VLANTAG; 1880 } 1881 1882 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 1883 m_freem(m0); 1884 sc->sc_ifp->if_oerrors++; 1885 break; 1886 } 1887 1888 sc->sc_ifp->if_opackets++; 1889 sc->sc_ifp->if_obytes += len; 1890 if (mflags & M_MCAST) 1891 sc->sc_ifp->if_omcasts++; 1892 } 1893 1894 return (err); 1895 } 1896 1897 /* 1898 * bridge_dummynet: 1899 * 1900 * Receive a queued packet from dummynet and pass it on to the output 1901 * interface. 1902 * 1903 * The mbuf has the Ethernet header already attached. 1904 */ 1905 static void 1906 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1907 { 1908 struct bridge_softc *sc; 1909 1910 sc = ifp->if_bridge; 1911 1912 /* 1913 * The packet didnt originate from a member interface. This should only 1914 * ever happen if a member interface is removed while packets are 1915 * queued for it. 1916 */ 1917 if (sc == NULL) { 1918 m_freem(m); 1919 return; 1920 } 1921 1922 if (PFIL_HOOKED(&V_inet_pfil_hook) 1923 #ifdef INET6 1924 || PFIL_HOOKED(&V_inet6_pfil_hook) 1925 #endif 1926 ) { 1927 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1928 return; 1929 if (m == NULL) 1930 return; 1931 } 1932 1933 bridge_enqueue(sc, ifp, m); 1934 } 1935 1936 /* 1937 * bridge_output: 1938 * 1939 * Send output from a bridge member interface. This 1940 * performs the bridging function for locally originated 1941 * packets. 1942 * 1943 * The mbuf has the Ethernet header already attached. We must 1944 * enqueue or free the mbuf before returning. 1945 */ 1946 static int 1947 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1948 struct rtentry *rt) 1949 { 1950 struct ether_header *eh; 1951 struct ifnet *dst_if; 1952 struct bridge_softc *sc; 1953 uint16_t vlan; 1954 1955 if (m->m_len < ETHER_HDR_LEN) { 1956 m = m_pullup(m, ETHER_HDR_LEN); 1957 if (m == NULL) 1958 return (0); 1959 } 1960 1961 eh = mtod(m, struct ether_header *); 1962 sc = ifp->if_bridge; 1963 vlan = VLANTAGOF(m); 1964 1965 BRIDGE_LOCK(sc); 1966 1967 /* 1968 * If bridge is down, but the original output interface is up, 1969 * go ahead and send out that interface. Otherwise, the packet 1970 * is dropped below. 1971 */ 1972 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1973 dst_if = ifp; 1974 goto sendunicast; 1975 } 1976 1977 /* 1978 * If the packet is a multicast, or we don't know a better way to 1979 * get there, send to all interfaces. 1980 */ 1981 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1982 dst_if = NULL; 1983 else 1984 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 1985 if (dst_if == NULL) { 1986 struct bridge_iflist *bif; 1987 struct mbuf *mc; 1988 int error = 0, used = 0; 1989 1990 bridge_span(sc, m); 1991 1992 BRIDGE_LOCK2REF(sc, error); 1993 if (error) { 1994 m_freem(m); 1995 return (0); 1996 } 1997 1998 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1999 dst_if = bif->bif_ifp; 2000 2001 if (dst_if->if_type == IFT_GIF) 2002 continue; 2003 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2004 continue; 2005 2006 /* 2007 * If this is not the original output interface, 2008 * and the interface is participating in spanning 2009 * tree, make sure the port is in a state that 2010 * allows forwarding. 2011 */ 2012 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 2013 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2014 continue; 2015 2016 if (LIST_NEXT(bif, bif_next) == NULL) { 2017 used = 1; 2018 mc = m; 2019 } else { 2020 mc = m_copypacket(m, M_NOWAIT); 2021 if (mc == NULL) { 2022 sc->sc_ifp->if_oerrors++; 2023 continue; 2024 } 2025 } 2026 2027 bridge_enqueue(sc, dst_if, mc); 2028 } 2029 if (used == 0) 2030 m_freem(m); 2031 BRIDGE_UNREF(sc); 2032 return (0); 2033 } 2034 2035 sendunicast: 2036 /* 2037 * XXX Spanning tree consideration here? 2038 */ 2039 2040 bridge_span(sc, m); 2041 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2042 m_freem(m); 2043 BRIDGE_UNLOCK(sc); 2044 return (0); 2045 } 2046 2047 BRIDGE_UNLOCK(sc); 2048 bridge_enqueue(sc, dst_if, m); 2049 return (0); 2050 } 2051 2052 /* 2053 * bridge_transmit: 2054 * 2055 * Do output on a bridge. 2056 * 2057 */ 2058 static int 2059 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2060 { 2061 struct bridge_softc *sc; 2062 struct ether_header *eh; 2063 struct ifnet *dst_if; 2064 int error = 0; 2065 2066 sc = ifp->if_softc; 2067 2068 ETHER_BPF_MTAP(ifp, m); 2069 2070 eh = mtod(m, struct ether_header *); 2071 2072 BRIDGE_LOCK(sc); 2073 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2074 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) { 2075 BRIDGE_UNLOCK(sc); 2076 error = bridge_enqueue(sc, dst_if, m); 2077 } else 2078 bridge_broadcast(sc, ifp, m, 0); 2079 2080 return (error); 2081 } 2082 2083 /* 2084 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2085 */ 2086 static void 2087 bridge_qflush(struct ifnet *ifp __unused) 2088 { 2089 } 2090 2091 /* 2092 * bridge_forward: 2093 * 2094 * The forwarding function of the bridge. 2095 * 2096 * NOTE: Releases the lock on return. 2097 */ 2098 static void 2099 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2100 struct mbuf *m) 2101 { 2102 struct bridge_iflist *dbif; 2103 struct ifnet *src_if, *dst_if, *ifp; 2104 struct ether_header *eh; 2105 uint16_t vlan; 2106 uint8_t *dst; 2107 int error; 2108 2109 src_if = m->m_pkthdr.rcvif; 2110 ifp = sc->sc_ifp; 2111 2112 ifp->if_ipackets++; 2113 ifp->if_ibytes += m->m_pkthdr.len; 2114 vlan = VLANTAGOF(m); 2115 2116 if ((sbif->bif_flags & IFBIF_STP) && 2117 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2118 goto drop; 2119 2120 eh = mtod(m, struct ether_header *); 2121 dst = eh->ether_dhost; 2122 2123 /* If the interface is learning, record the address. */ 2124 if (sbif->bif_flags & IFBIF_LEARNING) { 2125 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2126 sbif, 0, IFBAF_DYNAMIC); 2127 /* 2128 * If the interface has addresses limits then deny any source 2129 * that is not in the cache. 2130 */ 2131 if (error && sbif->bif_addrmax) 2132 goto drop; 2133 } 2134 2135 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2136 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2137 goto drop; 2138 2139 /* 2140 * At this point, the port either doesn't participate 2141 * in spanning tree or it is in the forwarding state. 2142 */ 2143 2144 /* 2145 * If the packet is unicast, destined for someone on 2146 * "this" side of the bridge, drop it. 2147 */ 2148 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2149 dst_if = bridge_rtlookup(sc, dst, vlan); 2150 if (src_if == dst_if) 2151 goto drop; 2152 } else { 2153 /* 2154 * Check if its a reserved multicast address, any address 2155 * listed in 802.1D section 7.12.6 may not be forwarded by the 2156 * bridge. 2157 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2158 */ 2159 if (dst[0] == 0x01 && dst[1] == 0x80 && 2160 dst[2] == 0xc2 && dst[3] == 0x00 && 2161 dst[4] == 0x00 && dst[5] <= 0x0f) 2162 goto drop; 2163 2164 /* ...forward it to all interfaces. */ 2165 ifp->if_imcasts++; 2166 dst_if = NULL; 2167 } 2168 2169 /* 2170 * If we have a destination interface which is a member of our bridge, 2171 * OR this is a unicast packet, push it through the bpf(4) machinery. 2172 * For broadcast or multicast packets, don't bother because it will 2173 * be reinjected into ether_input. We do this before we pass the packets 2174 * through the pfil(9) framework, as it is possible that pfil(9) will 2175 * drop the packet, or possibly modify it, making it difficult to debug 2176 * firewall issues on the bridge. 2177 */ 2178 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2179 ETHER_BPF_MTAP(ifp, m); 2180 2181 /* run the packet filter */ 2182 if (PFIL_HOOKED(&V_inet_pfil_hook) 2183 #ifdef INET6 2184 || PFIL_HOOKED(&V_inet6_pfil_hook) 2185 #endif 2186 ) { 2187 BRIDGE_UNLOCK(sc); 2188 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2189 return; 2190 if (m == NULL) 2191 return; 2192 BRIDGE_LOCK(sc); 2193 } 2194 2195 if (dst_if == NULL) { 2196 bridge_broadcast(sc, src_if, m, 1); 2197 return; 2198 } 2199 2200 /* 2201 * At this point, we're dealing with a unicast frame 2202 * going to a different interface. 2203 */ 2204 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2205 goto drop; 2206 2207 dbif = bridge_lookup_member_if(sc, dst_if); 2208 if (dbif == NULL) 2209 /* Not a member of the bridge (anymore?) */ 2210 goto drop; 2211 2212 /* Private segments can not talk to each other */ 2213 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2214 goto drop; 2215 2216 if ((dbif->bif_flags & IFBIF_STP) && 2217 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2218 goto drop; 2219 2220 BRIDGE_UNLOCK(sc); 2221 2222 if (PFIL_HOOKED(&V_inet_pfil_hook) 2223 #ifdef INET6 2224 || PFIL_HOOKED(&V_inet6_pfil_hook) 2225 #endif 2226 ) { 2227 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2228 return; 2229 if (m == NULL) 2230 return; 2231 } 2232 2233 bridge_enqueue(sc, dst_if, m); 2234 return; 2235 2236 drop: 2237 BRIDGE_UNLOCK(sc); 2238 m_freem(m); 2239 } 2240 2241 /* 2242 * bridge_input: 2243 * 2244 * Receive input from a member interface. Queue the packet for 2245 * bridging if it is not for us. 2246 */ 2247 static struct mbuf * 2248 bridge_input(struct ifnet *ifp, struct mbuf *m) 2249 { 2250 struct bridge_softc *sc = ifp->if_bridge; 2251 struct bridge_iflist *bif, *bif2; 2252 struct ifnet *bifp; 2253 struct ether_header *eh; 2254 struct mbuf *mc, *mc2; 2255 uint16_t vlan; 2256 int error; 2257 2258 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2259 return (m); 2260 2261 bifp = sc->sc_ifp; 2262 vlan = VLANTAGOF(m); 2263 2264 /* 2265 * Implement support for bridge monitoring. If this flag has been 2266 * set on this interface, discard the packet once we push it through 2267 * the bpf(4) machinery, but before we do, increment the byte and 2268 * packet counters associated with this interface. 2269 */ 2270 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2271 m->m_pkthdr.rcvif = bifp; 2272 ETHER_BPF_MTAP(bifp, m); 2273 bifp->if_ipackets++; 2274 bifp->if_ibytes += m->m_pkthdr.len; 2275 m_freem(m); 2276 return (NULL); 2277 } 2278 BRIDGE_LOCK(sc); 2279 bif = bridge_lookup_member_if(sc, ifp); 2280 if (bif == NULL) { 2281 BRIDGE_UNLOCK(sc); 2282 return (m); 2283 } 2284 2285 eh = mtod(m, struct ether_header *); 2286 2287 bridge_span(sc, m); 2288 2289 if (m->m_flags & (M_BCAST|M_MCAST)) { 2290 /* Tap off 802.1D packets; they do not get forwarded. */ 2291 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2292 ETHER_ADDR_LEN) == 0) { 2293 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2294 BRIDGE_UNLOCK(sc); 2295 return (NULL); 2296 } 2297 2298 if ((bif->bif_flags & IFBIF_STP) && 2299 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2300 BRIDGE_UNLOCK(sc); 2301 return (m); 2302 } 2303 2304 /* 2305 * Make a deep copy of the packet and enqueue the copy 2306 * for bridge processing; return the original packet for 2307 * local processing. 2308 */ 2309 mc = m_dup(m, M_NOWAIT); 2310 if (mc == NULL) { 2311 BRIDGE_UNLOCK(sc); 2312 return (m); 2313 } 2314 2315 /* Perform the bridge forwarding function with the copy. */ 2316 bridge_forward(sc, bif, mc); 2317 2318 /* 2319 * Reinject the mbuf as arriving on the bridge so we have a 2320 * chance at claiming multicast packets. We can not loop back 2321 * here from ether_input as a bridge is never a member of a 2322 * bridge. 2323 */ 2324 KASSERT(bifp->if_bridge == NULL, 2325 ("loop created in bridge_input")); 2326 mc2 = m_dup(m, M_NOWAIT); 2327 if (mc2 != NULL) { 2328 /* Keep the layer3 header aligned */ 2329 int i = min(mc2->m_pkthdr.len, max_protohdr); 2330 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2331 } 2332 if (mc2 != NULL) { 2333 mc2->m_pkthdr.rcvif = bifp; 2334 (*bifp->if_input)(bifp, mc2); 2335 } 2336 2337 /* Return the original packet for local processing. */ 2338 return (m); 2339 } 2340 2341 if ((bif->bif_flags & IFBIF_STP) && 2342 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2343 BRIDGE_UNLOCK(sc); 2344 return (m); 2345 } 2346 2347 #if (defined(INET) || defined(INET6)) 2348 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2349 || ((iface)->if_carp \ 2350 && (*carp_forus_p)((iface), eh->ether_dhost)) 2351 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2352 || ((iface)->if_carp \ 2353 && (*carp_forus_p)((iface), eh->ether_shost)) 2354 #else 2355 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2356 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2357 #endif 2358 2359 #ifdef INET6 2360 # define OR_PFIL_HOOKED_INET6 \ 2361 || PFIL_HOOKED(&V_inet6_pfil_hook) 2362 #else 2363 # define OR_PFIL_HOOKED_INET6 2364 #endif 2365 2366 #define GRAB_OUR_PACKETS(iface) \ 2367 if ((iface)->if_type == IFT_GIF) \ 2368 continue; \ 2369 /* It is destined for us. */ \ 2370 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2371 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2372 ) { \ 2373 if ((iface)->if_type == IFT_BRIDGE) { \ 2374 ETHER_BPF_MTAP(iface, m); \ 2375 iface->if_ipackets++; \ 2376 iface->if_ibytes += m->m_pkthdr.len; \ 2377 /* Filter on the physical interface. */ \ 2378 if (pfil_local_phys && \ 2379 (PFIL_HOOKED(&V_inet_pfil_hook) \ 2380 OR_PFIL_HOOKED_INET6)) { \ 2381 if (bridge_pfil(&m, NULL, ifp, \ 2382 PFIL_IN) != 0 || m == NULL) { \ 2383 BRIDGE_UNLOCK(sc); \ 2384 return (NULL); \ 2385 } \ 2386 eh = mtod(m, struct ether_header *); \ 2387 } \ 2388 } \ 2389 if (bif->bif_flags & IFBIF_LEARNING) { \ 2390 error = bridge_rtupdate(sc, eh->ether_shost, \ 2391 vlan, bif, 0, IFBAF_DYNAMIC); \ 2392 if (error && bif->bif_addrmax) { \ 2393 BRIDGE_UNLOCK(sc); \ 2394 m_freem(m); \ 2395 return (NULL); \ 2396 } \ 2397 } \ 2398 m->m_pkthdr.rcvif = iface; \ 2399 BRIDGE_UNLOCK(sc); \ 2400 return (m); \ 2401 } \ 2402 \ 2403 /* We just received a packet that we sent out. */ \ 2404 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2405 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2406 ) { \ 2407 BRIDGE_UNLOCK(sc); \ 2408 m_freem(m); \ 2409 return (NULL); \ 2410 } 2411 2412 /* 2413 * Unicast. Make sure it's not for the bridge. 2414 */ 2415 do { GRAB_OUR_PACKETS(bifp) } while (0); 2416 2417 /* 2418 * Give a chance for ifp at first priority. This will help when the 2419 * packet comes through the interface like VLAN's with the same MACs 2420 * on several interfaces from the same bridge. This also will save 2421 * some CPU cycles in case the destination interface and the input 2422 * interface (eq ifp) are the same. 2423 */ 2424 do { GRAB_OUR_PACKETS(ifp) } while (0); 2425 2426 /* Now check the all bridge members. */ 2427 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2428 GRAB_OUR_PACKETS(bif2->bif_ifp) 2429 } 2430 2431 #undef OR_CARP_CHECK_WE_ARE_DST 2432 #undef OR_CARP_CHECK_WE_ARE_SRC 2433 #undef OR_PFIL_HOOKED_INET6 2434 #undef GRAB_OUR_PACKETS 2435 2436 /* Perform the bridge forwarding function. */ 2437 bridge_forward(sc, bif, m); 2438 2439 return (NULL); 2440 } 2441 2442 /* 2443 * bridge_broadcast: 2444 * 2445 * Send a frame to all interfaces that are members of 2446 * the bridge, except for the one on which the packet 2447 * arrived. 2448 * 2449 * NOTE: Releases the lock on return. 2450 */ 2451 static void 2452 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2453 struct mbuf *m, int runfilt) 2454 { 2455 struct bridge_iflist *dbif, *sbif; 2456 struct mbuf *mc; 2457 struct ifnet *dst_if; 2458 int error = 0, used = 0, i; 2459 2460 sbif = bridge_lookup_member_if(sc, src_if); 2461 2462 BRIDGE_LOCK2REF(sc, error); 2463 if (error) { 2464 m_freem(m); 2465 return; 2466 } 2467 2468 /* Filter on the bridge interface before broadcasting */ 2469 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2470 #ifdef INET6 2471 || PFIL_HOOKED(&V_inet6_pfil_hook) 2472 #endif 2473 )) { 2474 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2475 goto out; 2476 if (m == NULL) 2477 goto out; 2478 } 2479 2480 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2481 dst_if = dbif->bif_ifp; 2482 if (dst_if == src_if) 2483 continue; 2484 2485 /* Private segments can not talk to each other */ 2486 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2487 continue; 2488 2489 if ((dbif->bif_flags & IFBIF_STP) && 2490 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2491 continue; 2492 2493 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2494 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2495 continue; 2496 2497 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2498 continue; 2499 2500 if (LIST_NEXT(dbif, bif_next) == NULL) { 2501 mc = m; 2502 used = 1; 2503 } else { 2504 mc = m_dup(m, M_NOWAIT); 2505 if (mc == NULL) { 2506 sc->sc_ifp->if_oerrors++; 2507 continue; 2508 } 2509 } 2510 2511 /* 2512 * Filter on the output interface. Pass a NULL bridge interface 2513 * pointer so we do not redundantly filter on the bridge for 2514 * each interface we broadcast on. 2515 */ 2516 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2517 #ifdef INET6 2518 || PFIL_HOOKED(&V_inet6_pfil_hook) 2519 #endif 2520 )) { 2521 if (used == 0) { 2522 /* Keep the layer3 header aligned */ 2523 i = min(mc->m_pkthdr.len, max_protohdr); 2524 mc = m_copyup(mc, i, ETHER_ALIGN); 2525 if (mc == NULL) { 2526 sc->sc_ifp->if_oerrors++; 2527 continue; 2528 } 2529 } 2530 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2531 continue; 2532 if (mc == NULL) 2533 continue; 2534 } 2535 2536 bridge_enqueue(sc, dst_if, mc); 2537 } 2538 if (used == 0) 2539 m_freem(m); 2540 2541 out: 2542 BRIDGE_UNREF(sc); 2543 } 2544 2545 /* 2546 * bridge_span: 2547 * 2548 * Duplicate a packet out one or more interfaces that are in span mode, 2549 * the original mbuf is unmodified. 2550 */ 2551 static void 2552 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2553 { 2554 struct bridge_iflist *bif; 2555 struct ifnet *dst_if; 2556 struct mbuf *mc; 2557 2558 if (LIST_EMPTY(&sc->sc_spanlist)) 2559 return; 2560 2561 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2562 dst_if = bif->bif_ifp; 2563 2564 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2565 continue; 2566 2567 mc = m_copypacket(m, M_NOWAIT); 2568 if (mc == NULL) { 2569 sc->sc_ifp->if_oerrors++; 2570 continue; 2571 } 2572 2573 bridge_enqueue(sc, dst_if, mc); 2574 } 2575 } 2576 2577 /* 2578 * bridge_rtupdate: 2579 * 2580 * Add a bridge routing entry. 2581 */ 2582 static int 2583 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2584 struct bridge_iflist *bif, int setflags, uint8_t flags) 2585 { 2586 struct bridge_rtnode *brt; 2587 int error; 2588 2589 BRIDGE_LOCK_ASSERT(sc); 2590 2591 /* Check the source address is valid and not multicast. */ 2592 if (ETHER_IS_MULTICAST(dst) || 2593 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2594 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2595 return (EINVAL); 2596 2597 /* 802.1p frames map to vlan 1 */ 2598 if (vlan == 0) 2599 vlan = 1; 2600 2601 /* 2602 * A route for this destination might already exist. If so, 2603 * update it, otherwise create a new one. 2604 */ 2605 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2606 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2607 sc->sc_brtexceeded++; 2608 return (ENOSPC); 2609 } 2610 /* Check per interface address limits (if enabled) */ 2611 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2612 bif->bif_addrexceeded++; 2613 return (ENOSPC); 2614 } 2615 2616 /* 2617 * Allocate a new bridge forwarding node, and 2618 * initialize the expiration time and Ethernet 2619 * address. 2620 */ 2621 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2622 if (brt == NULL) 2623 return (ENOMEM); 2624 2625 if (bif->bif_flags & IFBIF_STICKY) 2626 brt->brt_flags = IFBAF_STICKY; 2627 else 2628 brt->brt_flags = IFBAF_DYNAMIC; 2629 2630 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2631 brt->brt_vlan = vlan; 2632 2633 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2634 uma_zfree(bridge_rtnode_zone, brt); 2635 return (error); 2636 } 2637 brt->brt_dst = bif; 2638 bif->bif_addrcnt++; 2639 } 2640 2641 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2642 brt->brt_dst != bif) { 2643 brt->brt_dst->bif_addrcnt--; 2644 brt->brt_dst = bif; 2645 brt->brt_dst->bif_addrcnt++; 2646 } 2647 2648 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2649 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2650 if (setflags) 2651 brt->brt_flags = flags; 2652 2653 return (0); 2654 } 2655 2656 /* 2657 * bridge_rtlookup: 2658 * 2659 * Lookup the destination interface for an address. 2660 */ 2661 static struct ifnet * 2662 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2663 { 2664 struct bridge_rtnode *brt; 2665 2666 BRIDGE_LOCK_ASSERT(sc); 2667 2668 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2669 return (NULL); 2670 2671 return (brt->brt_ifp); 2672 } 2673 2674 /* 2675 * bridge_rttrim: 2676 * 2677 * Trim the routine table so that we have a number 2678 * of routing entries less than or equal to the 2679 * maximum number. 2680 */ 2681 static void 2682 bridge_rttrim(struct bridge_softc *sc) 2683 { 2684 struct bridge_rtnode *brt, *nbrt; 2685 2686 BRIDGE_LOCK_ASSERT(sc); 2687 2688 /* Make sure we actually need to do this. */ 2689 if (sc->sc_brtcnt <= sc->sc_brtmax) 2690 return; 2691 2692 /* Force an aging cycle; this might trim enough addresses. */ 2693 bridge_rtage(sc); 2694 if (sc->sc_brtcnt <= sc->sc_brtmax) 2695 return; 2696 2697 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2698 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2699 bridge_rtnode_destroy(sc, brt); 2700 if (sc->sc_brtcnt <= sc->sc_brtmax) 2701 return; 2702 } 2703 } 2704 } 2705 2706 /* 2707 * bridge_timer: 2708 * 2709 * Aging timer for the bridge. 2710 */ 2711 static void 2712 bridge_timer(void *arg) 2713 { 2714 struct bridge_softc *sc = arg; 2715 2716 BRIDGE_LOCK_ASSERT(sc); 2717 2718 bridge_rtage(sc); 2719 2720 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2721 callout_reset(&sc->sc_brcallout, 2722 bridge_rtable_prune_period * hz, bridge_timer, sc); 2723 } 2724 2725 /* 2726 * bridge_rtage: 2727 * 2728 * Perform an aging cycle. 2729 */ 2730 static void 2731 bridge_rtage(struct bridge_softc *sc) 2732 { 2733 struct bridge_rtnode *brt, *nbrt; 2734 2735 BRIDGE_LOCK_ASSERT(sc); 2736 2737 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2738 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2739 if (time_uptime >= brt->brt_expire) 2740 bridge_rtnode_destroy(sc, brt); 2741 } 2742 } 2743 } 2744 2745 /* 2746 * bridge_rtflush: 2747 * 2748 * Remove all dynamic addresses from the bridge. 2749 */ 2750 static void 2751 bridge_rtflush(struct bridge_softc *sc, int full) 2752 { 2753 struct bridge_rtnode *brt, *nbrt; 2754 2755 BRIDGE_LOCK_ASSERT(sc); 2756 2757 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2758 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2759 bridge_rtnode_destroy(sc, brt); 2760 } 2761 } 2762 2763 /* 2764 * bridge_rtdaddr: 2765 * 2766 * Remove an address from the table. 2767 */ 2768 static int 2769 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2770 { 2771 struct bridge_rtnode *brt; 2772 int found = 0; 2773 2774 BRIDGE_LOCK_ASSERT(sc); 2775 2776 /* 2777 * If vlan is zero then we want to delete for all vlans so the lookup 2778 * may return more than one. 2779 */ 2780 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2781 bridge_rtnode_destroy(sc, brt); 2782 found = 1; 2783 } 2784 2785 return (found ? 0 : ENOENT); 2786 } 2787 2788 /* 2789 * bridge_rtdelete: 2790 * 2791 * Delete routes to a speicifc member interface. 2792 */ 2793 static void 2794 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2795 { 2796 struct bridge_rtnode *brt, *nbrt; 2797 2798 BRIDGE_LOCK_ASSERT(sc); 2799 2800 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2801 if (brt->brt_ifp == ifp && (full || 2802 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2803 bridge_rtnode_destroy(sc, brt); 2804 } 2805 } 2806 2807 /* 2808 * bridge_rtable_init: 2809 * 2810 * Initialize the route table for this bridge. 2811 */ 2812 static void 2813 bridge_rtable_init(struct bridge_softc *sc) 2814 { 2815 int i; 2816 2817 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2818 M_DEVBUF, M_WAITOK); 2819 2820 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2821 LIST_INIT(&sc->sc_rthash[i]); 2822 2823 sc->sc_rthash_key = arc4random(); 2824 LIST_INIT(&sc->sc_rtlist); 2825 } 2826 2827 /* 2828 * bridge_rtable_fini: 2829 * 2830 * Deconstruct the route table for this bridge. 2831 */ 2832 static void 2833 bridge_rtable_fini(struct bridge_softc *sc) 2834 { 2835 2836 KASSERT(sc->sc_brtcnt == 0, 2837 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2838 free(sc->sc_rthash, M_DEVBUF); 2839 } 2840 2841 /* 2842 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2843 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2844 */ 2845 #define mix(a, b, c) \ 2846 do { \ 2847 a -= b; a -= c; a ^= (c >> 13); \ 2848 b -= c; b -= a; b ^= (a << 8); \ 2849 c -= a; c -= b; c ^= (b >> 13); \ 2850 a -= b; a -= c; a ^= (c >> 12); \ 2851 b -= c; b -= a; b ^= (a << 16); \ 2852 c -= a; c -= b; c ^= (b >> 5); \ 2853 a -= b; a -= c; a ^= (c >> 3); \ 2854 b -= c; b -= a; b ^= (a << 10); \ 2855 c -= a; c -= b; c ^= (b >> 15); \ 2856 } while (/*CONSTCOND*/0) 2857 2858 static __inline uint32_t 2859 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2860 { 2861 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2862 2863 b += addr[5] << 8; 2864 b += addr[4]; 2865 a += addr[3] << 24; 2866 a += addr[2] << 16; 2867 a += addr[1] << 8; 2868 a += addr[0]; 2869 2870 mix(a, b, c); 2871 2872 return (c & BRIDGE_RTHASH_MASK); 2873 } 2874 2875 #undef mix 2876 2877 static int 2878 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2879 { 2880 int i, d; 2881 2882 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2883 d = ((int)a[i]) - ((int)b[i]); 2884 } 2885 2886 return (d); 2887 } 2888 2889 /* 2890 * bridge_rtnode_lookup: 2891 * 2892 * Look up a bridge route node for the specified destination. Compare the 2893 * vlan id or if zero then just return the first match. 2894 */ 2895 static struct bridge_rtnode * 2896 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2897 { 2898 struct bridge_rtnode *brt; 2899 uint32_t hash; 2900 int dir; 2901 2902 BRIDGE_LOCK_ASSERT(sc); 2903 2904 hash = bridge_rthash(sc, addr); 2905 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2906 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2907 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2908 return (brt); 2909 if (dir > 0) 2910 return (NULL); 2911 } 2912 2913 return (NULL); 2914 } 2915 2916 /* 2917 * bridge_rtnode_insert: 2918 * 2919 * Insert the specified bridge node into the route table. We 2920 * assume the entry is not already in the table. 2921 */ 2922 static int 2923 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2924 { 2925 struct bridge_rtnode *lbrt; 2926 uint32_t hash; 2927 int dir; 2928 2929 BRIDGE_LOCK_ASSERT(sc); 2930 2931 hash = bridge_rthash(sc, brt->brt_addr); 2932 2933 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2934 if (lbrt == NULL) { 2935 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2936 goto out; 2937 } 2938 2939 do { 2940 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2941 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2942 return (EEXIST); 2943 if (dir > 0) { 2944 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2945 goto out; 2946 } 2947 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2948 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2949 goto out; 2950 } 2951 lbrt = LIST_NEXT(lbrt, brt_hash); 2952 } while (lbrt != NULL); 2953 2954 #ifdef DIAGNOSTIC 2955 panic("bridge_rtnode_insert: impossible"); 2956 #endif 2957 2958 out: 2959 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2960 sc->sc_brtcnt++; 2961 2962 return (0); 2963 } 2964 2965 /* 2966 * bridge_rtnode_destroy: 2967 * 2968 * Destroy a bridge rtnode. 2969 */ 2970 static void 2971 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2972 { 2973 BRIDGE_LOCK_ASSERT(sc); 2974 2975 LIST_REMOVE(brt, brt_hash); 2976 2977 LIST_REMOVE(brt, brt_list); 2978 sc->sc_brtcnt--; 2979 brt->brt_dst->bif_addrcnt--; 2980 uma_zfree(bridge_rtnode_zone, brt); 2981 } 2982 2983 /* 2984 * bridge_rtable_expire: 2985 * 2986 * Set the expiry time for all routes on an interface. 2987 */ 2988 static void 2989 bridge_rtable_expire(struct ifnet *ifp, int age) 2990 { 2991 struct bridge_softc *sc = ifp->if_bridge; 2992 struct bridge_rtnode *brt; 2993 2994 BRIDGE_LOCK(sc); 2995 2996 /* 2997 * If the age is zero then flush, otherwise set all the expiry times to 2998 * age for the interface 2999 */ 3000 if (age == 0) 3001 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 3002 else { 3003 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 3004 /* Cap the expiry time to 'age' */ 3005 if (brt->brt_ifp == ifp && 3006 brt->brt_expire > time_uptime + age && 3007 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3008 brt->brt_expire = time_uptime + age; 3009 } 3010 } 3011 BRIDGE_UNLOCK(sc); 3012 } 3013 3014 /* 3015 * bridge_state_change: 3016 * 3017 * Callback from the bridgestp code when a port changes states. 3018 */ 3019 static void 3020 bridge_state_change(struct ifnet *ifp, int state) 3021 { 3022 struct bridge_softc *sc = ifp->if_bridge; 3023 static const char *stpstates[] = { 3024 "disabled", 3025 "listening", 3026 "learning", 3027 "forwarding", 3028 "blocking", 3029 "discarding" 3030 }; 3031 3032 if (log_stp) 3033 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3034 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3035 } 3036 3037 /* 3038 * Send bridge packets through pfil if they are one of the types pfil can deal 3039 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3040 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3041 * that interface. 3042 */ 3043 static int 3044 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3045 { 3046 int snap, error, i, hlen; 3047 struct ether_header *eh1, eh2; 3048 struct ip *ip; 3049 struct llc llc1; 3050 u_int16_t ether_type; 3051 3052 snap = 0; 3053 error = -1; /* Default error if not error == 0 */ 3054 3055 #if 0 3056 /* we may return with the IP fields swapped, ensure its not shared */ 3057 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3058 #endif 3059 3060 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) 3061 return (0); /* filtering is disabled */ 3062 3063 i = min((*mp)->m_pkthdr.len, max_protohdr); 3064 if ((*mp)->m_len < i) { 3065 *mp = m_pullup(*mp, i); 3066 if (*mp == NULL) { 3067 printf("%s: m_pullup failed\n", __func__); 3068 return (-1); 3069 } 3070 } 3071 3072 eh1 = mtod(*mp, struct ether_header *); 3073 ether_type = ntohs(eh1->ether_type); 3074 3075 /* 3076 * Check for SNAP/LLC. 3077 */ 3078 if (ether_type < ETHERMTU) { 3079 struct llc *llc2 = (struct llc *)(eh1 + 1); 3080 3081 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3082 llc2->llc_dsap == LLC_SNAP_LSAP && 3083 llc2->llc_ssap == LLC_SNAP_LSAP && 3084 llc2->llc_control == LLC_UI) { 3085 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3086 snap = 1; 3087 } 3088 } 3089 3090 /* 3091 * If we're trying to filter bridge traffic, don't look at anything 3092 * other than IP and ARP traffic. If the filter doesn't understand 3093 * IPv6, don't allow IPv6 through the bridge either. This is lame 3094 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3095 * but of course we don't have an AppleTalk filter to begin with. 3096 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3097 * ARP traffic.) 3098 */ 3099 switch (ether_type) { 3100 case ETHERTYPE_ARP: 3101 case ETHERTYPE_REVARP: 3102 if (pfil_ipfw_arp == 0) 3103 return (0); /* Automatically pass */ 3104 break; 3105 3106 case ETHERTYPE_IP: 3107 #ifdef INET6 3108 case ETHERTYPE_IPV6: 3109 #endif /* INET6 */ 3110 break; 3111 default: 3112 /* 3113 * Check to see if the user wants to pass non-ip 3114 * packets, these will not be checked by pfil(9) and 3115 * passed unconditionally so the default is to drop. 3116 */ 3117 if (pfil_onlyip) 3118 goto bad; 3119 } 3120 3121 /* Run the packet through pfil before stripping link headers */ 3122 if (PFIL_HOOKED(&V_link_pfil_hook) && pfil_ipfw != 0 && 3123 dir == PFIL_OUT && ifp != NULL) { 3124 3125 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL); 3126 3127 if (*mp == NULL || error != 0) /* packet consumed by filter */ 3128 return (error); 3129 } 3130 3131 /* Strip off the Ethernet header and keep a copy. */ 3132 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3133 m_adj(*mp, ETHER_HDR_LEN); 3134 3135 /* Strip off snap header, if present */ 3136 if (snap) { 3137 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3138 m_adj(*mp, sizeof(struct llc)); 3139 } 3140 3141 /* 3142 * Check the IP header for alignment and errors 3143 */ 3144 if (dir == PFIL_IN) { 3145 switch (ether_type) { 3146 case ETHERTYPE_IP: 3147 error = bridge_ip_checkbasic(mp); 3148 break; 3149 #ifdef INET6 3150 case ETHERTYPE_IPV6: 3151 error = bridge_ip6_checkbasic(mp); 3152 break; 3153 #endif /* INET6 */ 3154 default: 3155 error = 0; 3156 } 3157 if (error) 3158 goto bad; 3159 } 3160 3161 error = 0; 3162 3163 /* 3164 * Run the packet through pfil 3165 */ 3166 switch (ether_type) { 3167 case ETHERTYPE_IP: 3168 /* 3169 * Run pfil on the member interface and the bridge, both can 3170 * be skipped by clearing pfil_member or pfil_bridge. 3171 * 3172 * Keep the order: 3173 * in_if -> bridge_if -> out_if 3174 */ 3175 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3176 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3177 dir, NULL); 3178 3179 if (*mp == NULL || error != 0) /* filter may consume */ 3180 break; 3181 3182 if (pfil_member && ifp != NULL) 3183 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, 3184 dir, NULL); 3185 3186 if (*mp == NULL || error != 0) /* filter may consume */ 3187 break; 3188 3189 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3190 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3191 dir, NULL); 3192 3193 if (*mp == NULL || error != 0) /* filter may consume */ 3194 break; 3195 3196 /* check if we need to fragment the packet */ 3197 if (pfil_member && ifp != NULL && dir == PFIL_OUT) { 3198 i = (*mp)->m_pkthdr.len; 3199 if (i > ifp->if_mtu) { 3200 error = bridge_fragment(ifp, *mp, &eh2, snap, 3201 &llc1); 3202 return (error); 3203 } 3204 } 3205 3206 /* Recalculate the ip checksum. */ 3207 ip = mtod(*mp, struct ip *); 3208 hlen = ip->ip_hl << 2; 3209 if (hlen < sizeof(struct ip)) 3210 goto bad; 3211 if (hlen > (*mp)->m_len) { 3212 if ((*mp = m_pullup(*mp, hlen)) == 0) 3213 goto bad; 3214 ip = mtod(*mp, struct ip *); 3215 if (ip == NULL) 3216 goto bad; 3217 } 3218 ip->ip_sum = 0; 3219 if (hlen == sizeof(struct ip)) 3220 ip->ip_sum = in_cksum_hdr(ip); 3221 else 3222 ip->ip_sum = in_cksum(*mp, hlen); 3223 3224 break; 3225 #ifdef INET6 3226 case ETHERTYPE_IPV6: 3227 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3228 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3229 dir, NULL); 3230 3231 if (*mp == NULL || error != 0) /* filter may consume */ 3232 break; 3233 3234 if (pfil_member && ifp != NULL) 3235 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp, 3236 dir, NULL); 3237 3238 if (*mp == NULL || error != 0) /* filter may consume */ 3239 break; 3240 3241 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3242 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3243 dir, NULL); 3244 break; 3245 #endif 3246 default: 3247 error = 0; 3248 break; 3249 } 3250 3251 if (*mp == NULL) 3252 return (error); 3253 if (error != 0) 3254 goto bad; 3255 3256 error = -1; 3257 3258 /* 3259 * Finally, put everything back the way it was and return 3260 */ 3261 if (snap) { 3262 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 3263 if (*mp == NULL) 3264 return (error); 3265 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3266 } 3267 3268 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 3269 if (*mp == NULL) 3270 return (error); 3271 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3272 3273 return (0); 3274 3275 bad: 3276 m_freem(*mp); 3277 *mp = NULL; 3278 return (error); 3279 } 3280 3281 /* 3282 * Perform basic checks on header size since 3283 * pfil assumes ip_input has already processed 3284 * it for it. Cut-and-pasted from ip_input.c. 3285 * Given how simple the IPv6 version is, 3286 * does the IPv4 version really need to be 3287 * this complicated? 3288 * 3289 * XXX Should we update ipstat here, or not? 3290 * XXX Right now we update ipstat but not 3291 * XXX csum_counter. 3292 */ 3293 static int 3294 bridge_ip_checkbasic(struct mbuf **mp) 3295 { 3296 struct mbuf *m = *mp; 3297 struct ip *ip; 3298 int len, hlen; 3299 u_short sum; 3300 3301 if (*mp == NULL) 3302 return (-1); 3303 3304 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3305 if ((m = m_copyup(m, sizeof(struct ip), 3306 (max_linkhdr + 3) & ~3)) == NULL) { 3307 /* XXXJRT new stat, please */ 3308 KMOD_IPSTAT_INC(ips_toosmall); 3309 goto bad; 3310 } 3311 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3312 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3313 KMOD_IPSTAT_INC(ips_toosmall); 3314 goto bad; 3315 } 3316 } 3317 ip = mtod(m, struct ip *); 3318 if (ip == NULL) goto bad; 3319 3320 if (ip->ip_v != IPVERSION) { 3321 KMOD_IPSTAT_INC(ips_badvers); 3322 goto bad; 3323 } 3324 hlen = ip->ip_hl << 2; 3325 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3326 KMOD_IPSTAT_INC(ips_badhlen); 3327 goto bad; 3328 } 3329 if (hlen > m->m_len) { 3330 if ((m = m_pullup(m, hlen)) == 0) { 3331 KMOD_IPSTAT_INC(ips_badhlen); 3332 goto bad; 3333 } 3334 ip = mtod(m, struct ip *); 3335 if (ip == NULL) goto bad; 3336 } 3337 3338 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3339 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3340 } else { 3341 if (hlen == sizeof(struct ip)) { 3342 sum = in_cksum_hdr(ip); 3343 } else { 3344 sum = in_cksum(m, hlen); 3345 } 3346 } 3347 if (sum) { 3348 KMOD_IPSTAT_INC(ips_badsum); 3349 goto bad; 3350 } 3351 3352 /* Retrieve the packet length. */ 3353 len = ntohs(ip->ip_len); 3354 3355 /* 3356 * Check for additional length bogosity 3357 */ 3358 if (len < hlen) { 3359 KMOD_IPSTAT_INC(ips_badlen); 3360 goto bad; 3361 } 3362 3363 /* 3364 * Check that the amount of data in the buffers 3365 * is as at least much as the IP header would have us expect. 3366 * Drop packet if shorter than we expect. 3367 */ 3368 if (m->m_pkthdr.len < len) { 3369 KMOD_IPSTAT_INC(ips_tooshort); 3370 goto bad; 3371 } 3372 3373 /* Checks out, proceed */ 3374 *mp = m; 3375 return (0); 3376 3377 bad: 3378 *mp = m; 3379 return (-1); 3380 } 3381 3382 #ifdef INET6 3383 /* 3384 * Same as above, but for IPv6. 3385 * Cut-and-pasted from ip6_input.c. 3386 * XXX Should we update ip6stat, or not? 3387 */ 3388 static int 3389 bridge_ip6_checkbasic(struct mbuf **mp) 3390 { 3391 struct mbuf *m = *mp; 3392 struct ip6_hdr *ip6; 3393 3394 /* 3395 * If the IPv6 header is not aligned, slurp it up into a new 3396 * mbuf with space for link headers, in the event we forward 3397 * it. Otherwise, if it is aligned, make sure the entire base 3398 * IPv6 header is in the first mbuf of the chain. 3399 */ 3400 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3401 struct ifnet *inifp = m->m_pkthdr.rcvif; 3402 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3403 (max_linkhdr + 3) & ~3)) == NULL) { 3404 /* XXXJRT new stat, please */ 3405 IP6STAT_INC(ip6s_toosmall); 3406 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3407 goto bad; 3408 } 3409 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3410 struct ifnet *inifp = m->m_pkthdr.rcvif; 3411 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3412 IP6STAT_INC(ip6s_toosmall); 3413 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3414 goto bad; 3415 } 3416 } 3417 3418 ip6 = mtod(m, struct ip6_hdr *); 3419 3420 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3421 IP6STAT_INC(ip6s_badvers); 3422 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3423 goto bad; 3424 } 3425 3426 /* Checks out, proceed */ 3427 *mp = m; 3428 return (0); 3429 3430 bad: 3431 *mp = m; 3432 return (-1); 3433 } 3434 #endif /* INET6 */ 3435 3436 /* 3437 * bridge_fragment: 3438 * 3439 * Return a fragmented mbuf chain. 3440 */ 3441 static int 3442 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, 3443 int snap, struct llc *llc) 3444 { 3445 struct mbuf *m0; 3446 struct ip *ip; 3447 int error = -1; 3448 3449 if (m->m_len < sizeof(struct ip) && 3450 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3451 goto out; 3452 ip = mtod(m, struct ip *); 3453 3454 m->m_pkthdr.csum_flags |= CSUM_IP; 3455 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 3456 if (error) 3457 goto out; 3458 3459 /* walk the chain and re-add the Ethernet header */ 3460 for (m0 = m; m0; m0 = m0->m_nextpkt) { 3461 if (error == 0) { 3462 if (snap) { 3463 M_PREPEND(m0, sizeof(struct llc), M_NOWAIT); 3464 if (m0 == NULL) { 3465 error = ENOBUFS; 3466 continue; 3467 } 3468 bcopy(llc, mtod(m0, caddr_t), 3469 sizeof(struct llc)); 3470 } 3471 M_PREPEND(m0, ETHER_HDR_LEN, M_NOWAIT); 3472 if (m0 == NULL) { 3473 error = ENOBUFS; 3474 continue; 3475 } 3476 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); 3477 } else 3478 m_freem(m); 3479 } 3480 3481 if (error == 0) 3482 KMOD_IPSTAT_INC(ips_fragmented); 3483 3484 return (error); 3485 3486 out: 3487 if (m != NULL) 3488 m_freem(m); 3489 return (error); 3490 } 3491 3492 static void 3493 bridge_linkstate(struct ifnet *ifp) 3494 { 3495 struct bridge_softc *sc = ifp->if_bridge; 3496 struct bridge_iflist *bif; 3497 3498 BRIDGE_LOCK(sc); 3499 bif = bridge_lookup_member_if(sc, ifp); 3500 if (bif == NULL) { 3501 BRIDGE_UNLOCK(sc); 3502 return; 3503 } 3504 bridge_linkcheck(sc); 3505 BRIDGE_UNLOCK(sc); 3506 3507 bstp_linkstate(&bif->bif_stp); 3508 } 3509 3510 static void 3511 bridge_linkcheck(struct bridge_softc *sc) 3512 { 3513 struct bridge_iflist *bif; 3514 int new_link, hasls; 3515 3516 BRIDGE_LOCK_ASSERT(sc); 3517 new_link = LINK_STATE_DOWN; 3518 hasls = 0; 3519 /* Our link is considered up if at least one of our ports is active */ 3520 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3521 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3522 hasls++; 3523 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3524 new_link = LINK_STATE_UP; 3525 break; 3526 } 3527 } 3528 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3529 /* If no interfaces support link-state then we default to up */ 3530 new_link = LINK_STATE_UP; 3531 } 3532 if_link_state_change(sc->sc_ifp, new_link); 3533 } 3534