Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/net/if_bridge.c
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1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) 40 * All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 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 IFCAP_TXCSUM_IPV6) 170 171 /* 172 * List of capabilities to strip 173 */ 174 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 175 176 /* 177 * Bridge interface list entry. 178 */ 179 struct bridge_iflist { 180 LIST_ENTRY(bridge_iflist) bif_next; 181 struct ifnet *bif_ifp; /* member if */ 182 struct bstp_port bif_stp; /* STP state */ 183 uint32_t bif_flags; /* member if flags */ 184 int bif_savedcaps; /* saved capabilities */ 185 uint32_t bif_addrmax; /* max # of addresses */ 186 uint32_t bif_addrcnt; /* cur. # of addresses */ 187 uint32_t bif_addrexceeded;/* # of address violations */ 188 }; 189 190 /* 191 * Bridge route node. 192 */ 193 struct bridge_rtnode { 194 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 195 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 196 struct bridge_iflist *brt_dst; /* destination if */ 197 unsigned long brt_expire; /* expiration time */ 198 uint8_t brt_flags; /* address flags */ 199 uint8_t brt_addr[ETHER_ADDR_LEN]; 200 uint16_t brt_vlan; /* vlan id */ 201 }; 202 #define brt_ifp brt_dst->bif_ifp 203 204 /* 205 * Software state for each bridge. 206 */ 207 struct bridge_softc { 208 struct ifnet *sc_ifp; /* make this an interface */ 209 LIST_ENTRY(bridge_softc) sc_list; 210 struct mtx sc_mtx; 211 struct cv sc_cv; 212 uint32_t sc_brtmax; /* max # of addresses */ 213 uint32_t sc_brtcnt; /* cur. # of addresses */ 214 uint32_t sc_brttimeout; /* rt timeout in seconds */ 215 struct callout sc_brcallout; /* bridge callout */ 216 uint32_t sc_iflist_ref; /* refcount for sc_iflist */ 217 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ 218 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 219 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 220 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 221 uint32_t sc_rthash_key; /* key for hash */ 222 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 223 struct bstp_state sc_stp; /* STP state */ 224 uint32_t sc_brtexceeded; /* # of cache drops */ 225 struct ifnet *sc_ifaddr; /* member mac copied from */ 226 u_char sc_defaddr[6]; /* Default MAC address */ 227 }; 228 229 static struct mtx bridge_list_mtx; 230 eventhandler_tag bridge_detach_cookie = NULL; 231 232 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 233 234 uma_zone_t bridge_rtnode_zone; 235 236 static int bridge_clone_create(struct if_clone *, int, caddr_t); 237 static void bridge_clone_destroy(struct ifnet *); 238 239 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 240 static void bridge_mutecaps(struct bridge_softc *); 241 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 242 int); 243 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 244 static void bridge_init(void *); 245 static void bridge_dummynet(struct mbuf *, struct ifnet *); 246 static void bridge_stop(struct ifnet *, int); 247 static int bridge_transmit(struct ifnet *, struct mbuf *); 248 static void bridge_qflush(struct ifnet *); 249 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 250 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 251 struct rtentry *); 252 static int bridge_enqueue(struct bridge_softc *, struct ifnet *, 253 struct mbuf *); 254 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 255 256 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 257 struct mbuf *m); 258 259 static void bridge_timer(void *); 260 261 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 262 struct mbuf *, int); 263 static void bridge_span(struct bridge_softc *, struct mbuf *); 264 265 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 266 uint16_t, struct bridge_iflist *, int, uint8_t); 267 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 268 uint16_t); 269 static void bridge_rttrim(struct bridge_softc *); 270 static void bridge_rtage(struct bridge_softc *); 271 static void bridge_rtflush(struct bridge_softc *, int); 272 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 273 uint16_t); 274 275 static void bridge_rtable_init(struct bridge_softc *); 276 static void bridge_rtable_fini(struct bridge_softc *); 277 278 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 279 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 280 const uint8_t *, uint16_t); 281 static int bridge_rtnode_insert(struct bridge_softc *, 282 struct bridge_rtnode *); 283 static void bridge_rtnode_destroy(struct bridge_softc *, 284 struct bridge_rtnode *); 285 static void bridge_rtable_expire(struct ifnet *, int); 286 static void bridge_state_change(struct ifnet *, int); 287 288 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 289 const char *name); 290 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 291 struct ifnet *ifp); 292 static void bridge_delete_member(struct bridge_softc *, 293 struct bridge_iflist *, int); 294 static void bridge_delete_span(struct bridge_softc *, 295 struct bridge_iflist *); 296 297 static int bridge_ioctl_add(struct bridge_softc *, void *); 298 static int bridge_ioctl_del(struct bridge_softc *, void *); 299 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 300 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 301 static int bridge_ioctl_scache(struct bridge_softc *, void *); 302 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 303 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 304 static int bridge_ioctl_rts(struct bridge_softc *, void *); 305 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 306 static int bridge_ioctl_sto(struct bridge_softc *, void *); 307 static int bridge_ioctl_gto(struct bridge_softc *, void *); 308 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 309 static int bridge_ioctl_flush(struct bridge_softc *, void *); 310 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 311 static int bridge_ioctl_spri(struct bridge_softc *, void *); 312 static int bridge_ioctl_ght(struct bridge_softc *, void *); 313 static int bridge_ioctl_sht(struct bridge_softc *, void *); 314 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 315 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 316 static int bridge_ioctl_gma(struct bridge_softc *, void *); 317 static int bridge_ioctl_sma(struct bridge_softc *, void *); 318 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 319 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 320 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 321 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 322 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 323 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 324 static int bridge_ioctl_grte(struct bridge_softc *, void *); 325 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 326 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 327 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 328 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 329 int); 330 static int bridge_ip_checkbasic(struct mbuf **mp); 331 #ifdef INET6 332 static int bridge_ip6_checkbasic(struct mbuf **mp); 333 #endif /* INET6 */ 334 static int bridge_fragment(struct ifnet *, struct mbuf **mp, 335 struct ether_header *, int, struct llc *); 336 static void bridge_linkstate(struct ifnet *ifp); 337 static void bridge_linkcheck(struct bridge_softc *sc); 338 339 extern void (*bridge_linkstate_p)(struct ifnet *ifp); 340 341 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 342 #define VLANTAGOF(_m) \ 343 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 344 345 static struct bstp_cb_ops bridge_ops = { 346 .bcb_state = bridge_state_change, 347 .bcb_rtage = bridge_rtable_expire 348 }; 349 350 SYSCTL_DECL(_net_link); 351 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 352 353 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */ 354 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */ 355 static int pfil_member = 1; /* run pfil hooks on the member interface */ 356 static int pfil_ipfw = 0; /* layer2 filter with ipfw */ 357 static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */ 358 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for 359 locally destined packets */ 360 static int log_stp = 0; /* log STP state changes */ 361 static int bridge_inherit_mac = 0; /* share MAC with first bridge member */ 362 TUNABLE_INT("net.link.bridge.pfil_onlyip", &pfil_onlyip); 363 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW, 364 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled"); 365 TUNABLE_INT("net.link.bridge.ipfw_arp", &pfil_ipfw_arp); 366 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW, 367 &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2"); 368 TUNABLE_INT("net.link.bridge.pfil_bridge", &pfil_bridge); 369 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW, 370 &pfil_bridge, 0, "Packet filter on the bridge interface"); 371 TUNABLE_INT("net.link.bridge.pfil_member", &pfil_member); 372 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW, 373 &pfil_member, 0, "Packet filter on the member interface"); 374 TUNABLE_INT("net.link.bridge.pfil_local_phys", &pfil_local_phys); 375 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW, 376 &pfil_local_phys, 0, 377 "Packet filter on the physical interface for locally destined packets"); 378 TUNABLE_INT("net.link.bridge.log_stp", &log_stp); 379 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW, 380 &log_stp, 0, "Log STP state changes"); 381 TUNABLE_INT("net.link.bridge.inherit_mac", &bridge_inherit_mac); 382 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW, 383 &bridge_inherit_mac, 0, 384 "Inherit MAC address from the first bridge member"); 385 386 static VNET_DEFINE(int, allow_llz_overlap) = 0; 387 #define V_allow_llz_overlap VNET(allow_llz_overlap) 388 SYSCTL_VNET_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, CTLFLAG_RW, 389 &VNET_NAME(allow_llz_overlap), 0, "Allow overlap of link-local scope " 390 "zones of a bridge interface and the member interfaces"); 391 392 struct bridge_control { 393 int (*bc_func)(struct bridge_softc *, void *); 394 int bc_argsize; 395 int bc_flags; 396 }; 397 398 #define BC_F_COPYIN 0x01 /* copy arguments in */ 399 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 400 #define BC_F_SUSER 0x04 /* do super-user check */ 401 402 const struct bridge_control bridge_control_table[] = { 403 { bridge_ioctl_add, sizeof(struct ifbreq), 404 BC_F_COPYIN|BC_F_SUSER }, 405 { bridge_ioctl_del, sizeof(struct ifbreq), 406 BC_F_COPYIN|BC_F_SUSER }, 407 408 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 409 BC_F_COPYIN|BC_F_COPYOUT }, 410 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 411 BC_F_COPYIN|BC_F_SUSER }, 412 413 { bridge_ioctl_scache, sizeof(struct ifbrparam), 414 BC_F_COPYIN|BC_F_SUSER }, 415 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 416 BC_F_COPYOUT }, 417 418 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 419 BC_F_COPYIN|BC_F_COPYOUT }, 420 { bridge_ioctl_rts, sizeof(struct ifbaconf), 421 BC_F_COPYIN|BC_F_COPYOUT }, 422 423 { bridge_ioctl_saddr, sizeof(struct ifbareq), 424 BC_F_COPYIN|BC_F_SUSER }, 425 426 { bridge_ioctl_sto, sizeof(struct ifbrparam), 427 BC_F_COPYIN|BC_F_SUSER }, 428 { bridge_ioctl_gto, sizeof(struct ifbrparam), 429 BC_F_COPYOUT }, 430 431 { bridge_ioctl_daddr, sizeof(struct ifbareq), 432 BC_F_COPYIN|BC_F_SUSER }, 433 434 { bridge_ioctl_flush, sizeof(struct ifbreq), 435 BC_F_COPYIN|BC_F_SUSER }, 436 437 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 438 BC_F_COPYOUT }, 439 { bridge_ioctl_spri, sizeof(struct ifbrparam), 440 BC_F_COPYIN|BC_F_SUSER }, 441 442 { bridge_ioctl_ght, sizeof(struct ifbrparam), 443 BC_F_COPYOUT }, 444 { bridge_ioctl_sht, sizeof(struct ifbrparam), 445 BC_F_COPYIN|BC_F_SUSER }, 446 447 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 448 BC_F_COPYOUT }, 449 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 450 BC_F_COPYIN|BC_F_SUSER }, 451 452 { bridge_ioctl_gma, sizeof(struct ifbrparam), 453 BC_F_COPYOUT }, 454 { bridge_ioctl_sma, sizeof(struct ifbrparam), 455 BC_F_COPYIN|BC_F_SUSER }, 456 457 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 458 BC_F_COPYIN|BC_F_SUSER }, 459 460 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 461 BC_F_COPYIN|BC_F_SUSER }, 462 463 { bridge_ioctl_addspan, sizeof(struct ifbreq), 464 BC_F_COPYIN|BC_F_SUSER }, 465 { bridge_ioctl_delspan, sizeof(struct ifbreq), 466 BC_F_COPYIN|BC_F_SUSER }, 467 468 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 469 BC_F_COPYOUT }, 470 471 { bridge_ioctl_grte, sizeof(struct ifbrparam), 472 BC_F_COPYOUT }, 473 474 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 475 BC_F_COPYIN|BC_F_COPYOUT }, 476 477 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 478 BC_F_COPYIN|BC_F_SUSER }, 479 480 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 481 BC_F_COPYIN|BC_F_SUSER }, 482 483 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 484 BC_F_COPYIN|BC_F_SUSER }, 485 486 }; 487 const int bridge_control_table_size = 488 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 489 490 LIST_HEAD(, bridge_softc) bridge_list; 491 492 static struct if_clone *bridge_cloner; 493 static const char bridge_name[] = "bridge"; 494 495 static int 496 bridge_modevent(module_t mod, int type, void *data) 497 { 498 499 switch (type) { 500 case MOD_LOAD: 501 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF); 502 bridge_cloner = if_clone_simple(bridge_name, 503 bridge_clone_create, bridge_clone_destroy, 0); 504 bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 505 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 506 UMA_ALIGN_PTR, 0); 507 LIST_INIT(&bridge_list); 508 bridge_input_p = bridge_input; 509 bridge_output_p = bridge_output; 510 bridge_dn_p = bridge_dummynet; 511 bridge_linkstate_p = bridge_linkstate; 512 bridge_detach_cookie = EVENTHANDLER_REGISTER( 513 ifnet_departure_event, bridge_ifdetach, NULL, 514 EVENTHANDLER_PRI_ANY); 515 break; 516 case MOD_UNLOAD: 517 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 518 bridge_detach_cookie); 519 if_clone_detach(bridge_cloner); 520 uma_zdestroy(bridge_rtnode_zone); 521 bridge_input_p = NULL; 522 bridge_output_p = NULL; 523 bridge_dn_p = NULL; 524 bridge_linkstate_p = NULL; 525 mtx_destroy(&bridge_list_mtx); 526 break; 527 default: 528 return (EOPNOTSUPP); 529 } 530 return (0); 531 } 532 533 static moduledata_t bridge_mod = { 534 "if_bridge", 535 bridge_modevent, 536 0 537 }; 538 539 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 540 MODULE_VERSION(if_bridge, 1); 541 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 542 543 /* 544 * handler for net.link.bridge.ipfw 545 */ 546 static int 547 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 548 { 549 int enable = pfil_ipfw; 550 int error; 551 552 error = sysctl_handle_int(oidp, &enable, 0, req); 553 enable = (enable) ? 1 : 0; 554 555 if (enable != pfil_ipfw) { 556 pfil_ipfw = enable; 557 558 /* 559 * Disable pfil so that ipfw doesnt run twice, if the user 560 * really wants both then they can re-enable pfil_bridge and/or 561 * pfil_member. Also allow non-ip packets as ipfw can filter by 562 * layer2 type. 563 */ 564 if (pfil_ipfw) { 565 pfil_onlyip = 0; 566 pfil_bridge = 0; 567 pfil_member = 0; 568 } 569 } 570 571 return (error); 572 } 573 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW, 574 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW"); 575 576 /* 577 * bridge_clone_create: 578 * 579 * Create a new bridge instance. 580 */ 581 static int 582 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 583 { 584 struct bridge_softc *sc, *sc2; 585 struct ifnet *bifp, *ifp; 586 int fb, retry; 587 unsigned long hostid; 588 589 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 590 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 591 if (ifp == NULL) { 592 free(sc, M_DEVBUF); 593 return (ENOSPC); 594 } 595 596 BRIDGE_LOCK_INIT(sc); 597 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 598 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 599 600 /* Initialize our routing table. */ 601 bridge_rtable_init(sc); 602 603 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 604 605 LIST_INIT(&sc->sc_iflist); 606 LIST_INIT(&sc->sc_spanlist); 607 608 ifp->if_softc = sc; 609 if_initname(ifp, bridge_name, unit); 610 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 611 ifp->if_ioctl = bridge_ioctl; 612 ifp->if_transmit = bridge_transmit; 613 ifp->if_qflush = bridge_qflush; 614 ifp->if_init = bridge_init; 615 ifp->if_type = IFT_BRIDGE; 616 617 /* 618 * Generate an ethernet address with a locally administered address. 619 * 620 * Since we are using random ethernet addresses for the bridge, it is 621 * possible that we might have address collisions, so make sure that 622 * this hardware address isn't already in use on another bridge. 623 * The first try uses the hostid and falls back to arc4rand(). 624 */ 625 fb = 0; 626 getcredhostid(curthread->td_ucred, &hostid); 627 do { 628 if (fb || hostid == 0) { 629 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1); 630 sc->sc_defaddr[0] &= ~1;/* clear multicast bit */ 631 sc->sc_defaddr[0] |= 2; /* set the LAA bit */ 632 } else { 633 sc->sc_defaddr[0] = 0x2; 634 sc->sc_defaddr[1] = (hostid >> 24) & 0xff; 635 sc->sc_defaddr[2] = (hostid >> 16) & 0xff; 636 sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff; 637 sc->sc_defaddr[4] = hostid & 0xff; 638 sc->sc_defaddr[5] = ifp->if_dunit & 0xff; 639 } 640 641 fb = 1; 642 retry = 0; 643 mtx_lock(&bridge_list_mtx); 644 LIST_FOREACH(sc2, &bridge_list, sc_list) { 645 bifp = sc2->sc_ifp; 646 if (memcmp(sc->sc_defaddr, 647 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) { 648 retry = 1; 649 break; 650 } 651 } 652 mtx_unlock(&bridge_list_mtx); 653 } while (retry == 1); 654 655 bstp_attach(&sc->sc_stp, &bridge_ops); 656 ether_ifattach(ifp, sc->sc_defaddr); 657 /* Now undo some of the damage... */ 658 ifp->if_baudrate = 0; 659 ifp->if_type = IFT_BRIDGE; 660 661 mtx_lock(&bridge_list_mtx); 662 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 663 mtx_unlock(&bridge_list_mtx); 664 665 return (0); 666 } 667 668 /* 669 * bridge_clone_destroy: 670 * 671 * Destroy a bridge instance. 672 */ 673 static void 674 bridge_clone_destroy(struct ifnet *ifp) 675 { 676 struct bridge_softc *sc = ifp->if_softc; 677 struct bridge_iflist *bif; 678 679 BRIDGE_LOCK(sc); 680 681 bridge_stop(ifp, 1); 682 ifp->if_flags &= ~IFF_UP; 683 684 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 685 bridge_delete_member(sc, bif, 0); 686 687 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 688 bridge_delete_span(sc, bif); 689 } 690 691 BRIDGE_UNLOCK(sc); 692 693 callout_drain(&sc->sc_brcallout); 694 695 mtx_lock(&bridge_list_mtx); 696 LIST_REMOVE(sc, sc_list); 697 mtx_unlock(&bridge_list_mtx); 698 699 bstp_detach(&sc->sc_stp); 700 ether_ifdetach(ifp); 701 if_free(ifp); 702 703 /* Tear down the routing table. */ 704 bridge_rtable_fini(sc); 705 706 BRIDGE_LOCK_DESTROY(sc); 707 free(sc, M_DEVBUF); 708 } 709 710 /* 711 * bridge_ioctl: 712 * 713 * Handle a control request from the operator. 714 */ 715 static int 716 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 717 { 718 struct bridge_softc *sc = ifp->if_softc; 719 struct ifreq *ifr = (struct ifreq *)data; 720 struct bridge_iflist *bif; 721 struct thread *td = curthread; 722 union { 723 struct ifbreq ifbreq; 724 struct ifbifconf ifbifconf; 725 struct ifbareq ifbareq; 726 struct ifbaconf ifbaconf; 727 struct ifbrparam ifbrparam; 728 struct ifbropreq ifbropreq; 729 } args; 730 struct ifdrv *ifd = (struct ifdrv *) data; 731 const struct bridge_control *bc; 732 int error = 0; 733 734 switch (cmd) { 735 736 case SIOCADDMULTI: 737 case SIOCDELMULTI: 738 break; 739 740 case SIOCGDRVSPEC: 741 case SIOCSDRVSPEC: 742 if (ifd->ifd_cmd >= bridge_control_table_size) { 743 error = EINVAL; 744 break; 745 } 746 bc = &bridge_control_table[ifd->ifd_cmd]; 747 748 if (cmd == SIOCGDRVSPEC && 749 (bc->bc_flags & BC_F_COPYOUT) == 0) { 750 error = EINVAL; 751 break; 752 } 753 else if (cmd == SIOCSDRVSPEC && 754 (bc->bc_flags & BC_F_COPYOUT) != 0) { 755 error = EINVAL; 756 break; 757 } 758 759 if (bc->bc_flags & BC_F_SUSER) { 760 error = priv_check(td, PRIV_NET_BRIDGE); 761 if (error) 762 break; 763 } 764 765 if (ifd->ifd_len != bc->bc_argsize || 766 ifd->ifd_len > sizeof(args)) { 767 error = EINVAL; 768 break; 769 } 770 771 bzero(&args, sizeof(args)); 772 if (bc->bc_flags & BC_F_COPYIN) { 773 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 774 if (error) 775 break; 776 } 777 778 BRIDGE_LOCK(sc); 779 error = (*bc->bc_func)(sc, &args); 780 BRIDGE_UNLOCK(sc); 781 if (error) 782 break; 783 784 if (bc->bc_flags & BC_F_COPYOUT) 785 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 786 787 break; 788 789 case SIOCSIFFLAGS: 790 if (!(ifp->if_flags & IFF_UP) && 791 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 792 /* 793 * If interface is marked down and it is running, 794 * then stop and disable it. 795 */ 796 BRIDGE_LOCK(sc); 797 bridge_stop(ifp, 1); 798 BRIDGE_UNLOCK(sc); 799 } else if ((ifp->if_flags & IFF_UP) && 800 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 801 /* 802 * If interface is marked up and it is stopped, then 803 * start it. 804 */ 805 (*ifp->if_init)(sc); 806 } 807 break; 808 809 case SIOCSIFMTU: 810 if (ifr->ifr_mtu < 576) { 811 error = EINVAL; 812 break; 813 } 814 if (LIST_EMPTY(&sc->sc_iflist)) { 815 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 816 break; 817 } 818 BRIDGE_LOCK(sc); 819 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 820 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) { 821 log(LOG_NOTICE, "%s: invalid MTU: %lu(%s)" 822 " != %d\n", sc->sc_ifp->if_xname, 823 bif->bif_ifp->if_mtu, 824 bif->bif_ifp->if_xname, ifr->ifr_mtu); 825 error = EINVAL; 826 break; 827 } 828 } 829 if (!error) 830 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 831 BRIDGE_UNLOCK(sc); 832 break; 833 default: 834 /* 835 * drop the lock as ether_ioctl() will call bridge_start() and 836 * cause the lock to be recursed. 837 */ 838 error = ether_ioctl(ifp, cmd, data); 839 break; 840 } 841 842 return (error); 843 } 844 845 /* 846 * bridge_mutecaps: 847 * 848 * Clear or restore unwanted capabilities on the member interface 849 */ 850 static void 851 bridge_mutecaps(struct bridge_softc *sc) 852 { 853 struct bridge_iflist *bif; 854 int enabled, mask; 855 856 /* Initial bitmask of capabilities to test */ 857 mask = BRIDGE_IFCAPS_MASK; 858 859 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 860 /* Every member must support it or its disabled */ 861 mask &= bif->bif_savedcaps; 862 } 863 864 BRIDGE_XLOCK(sc); 865 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 866 enabled = bif->bif_ifp->if_capenable; 867 enabled &= ~BRIDGE_IFCAPS_STRIP; 868 /* strip off mask bits and enable them again if allowed */ 869 enabled &= ~BRIDGE_IFCAPS_MASK; 870 enabled |= mask; 871 BRIDGE_UNLOCK(sc); 872 bridge_set_ifcap(sc, bif, enabled); 873 BRIDGE_LOCK(sc); 874 } 875 BRIDGE_XDROP(sc); 876 877 } 878 879 static void 880 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 881 { 882 struct ifnet *ifp = bif->bif_ifp; 883 struct ifreq ifr; 884 int error; 885 886 BRIDGE_UNLOCK_ASSERT(sc); 887 888 bzero(&ifr, sizeof(ifr)); 889 ifr.ifr_reqcap = set; 890 891 if (ifp->if_capenable != set) { 892 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 893 if (error) 894 if_printf(sc->sc_ifp, 895 "error setting interface capabilities on %s\n", 896 ifp->if_xname); 897 } 898 } 899 900 /* 901 * bridge_lookup_member: 902 * 903 * Lookup a bridge member interface. 904 */ 905 static struct bridge_iflist * 906 bridge_lookup_member(struct bridge_softc *sc, const char *name) 907 { 908 struct bridge_iflist *bif; 909 struct ifnet *ifp; 910 911 BRIDGE_LOCK_ASSERT(sc); 912 913 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 914 ifp = bif->bif_ifp; 915 if (strcmp(ifp->if_xname, name) == 0) 916 return (bif); 917 } 918 919 return (NULL); 920 } 921 922 /* 923 * bridge_lookup_member_if: 924 * 925 * Lookup a bridge member interface by ifnet*. 926 */ 927 static struct bridge_iflist * 928 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 929 { 930 struct bridge_iflist *bif; 931 932 BRIDGE_LOCK_ASSERT(sc); 933 934 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 935 if (bif->bif_ifp == member_ifp) 936 return (bif); 937 } 938 939 return (NULL); 940 } 941 942 /* 943 * bridge_delete_member: 944 * 945 * Delete the specified member interface. 946 */ 947 static void 948 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 949 int gone) 950 { 951 struct ifnet *ifs = bif->bif_ifp; 952 struct ifnet *fif = NULL; 953 954 BRIDGE_LOCK_ASSERT(sc); 955 956 if (bif->bif_flags & IFBIF_STP) 957 bstp_disable(&bif->bif_stp); 958 959 ifs->if_bridge = NULL; 960 BRIDGE_XLOCK(sc); 961 LIST_REMOVE(bif, bif_next); 962 BRIDGE_XDROP(sc); 963 964 /* 965 * If removing the interface that gave the bridge its mac address, set 966 * the mac address of the bridge to the address of the next member, or 967 * to its default address if no members are left. 968 */ 969 if (bridge_inherit_mac && sc->sc_ifaddr == ifs) { 970 if (LIST_EMPTY(&sc->sc_iflist)) { 971 bcopy(sc->sc_defaddr, 972 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 973 sc->sc_ifaddr = NULL; 974 } else { 975 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp; 976 bcopy(IF_LLADDR(fif), 977 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 978 sc->sc_ifaddr = fif; 979 } 980 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 981 } 982 983 bridge_linkcheck(sc); 984 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 985 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 986 KASSERT(bif->bif_addrcnt == 0, 987 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 988 989 BRIDGE_UNLOCK(sc); 990 if (!gone) { 991 switch (ifs->if_type) { 992 case IFT_ETHER: 993 case IFT_L2VLAN: 994 /* 995 * Take the interface out of promiscuous mode, but only 996 * if it was promiscuous in the first place. It might 997 * not be if we're in the bridge_ioctl_add() error path. 998 */ 999 if (ifs->if_flags & IFF_PROMISC) 1000 (void) ifpromisc(ifs, 0); 1001 break; 1002 1003 case IFT_GIF: 1004 break; 1005 1006 default: 1007 #ifdef DIAGNOSTIC 1008 panic("bridge_delete_member: impossible"); 1009 #endif 1010 break; 1011 } 1012 /* reneable any interface capabilities */ 1013 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 1014 } 1015 bstp_destroy(&bif->bif_stp); /* prepare to free */ 1016 BRIDGE_LOCK(sc); 1017 free(bif, M_DEVBUF); 1018 } 1019 1020 /* 1021 * bridge_delete_span: 1022 * 1023 * Delete the specified span interface. 1024 */ 1025 static void 1026 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1027 { 1028 BRIDGE_LOCK_ASSERT(sc); 1029 1030 KASSERT(bif->bif_ifp->if_bridge == NULL, 1031 ("%s: not a span interface", __func__)); 1032 1033 LIST_REMOVE(bif, bif_next); 1034 free(bif, M_DEVBUF); 1035 } 1036 1037 static int 1038 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1039 { 1040 struct ifbreq *req = arg; 1041 struct bridge_iflist *bif = NULL; 1042 struct ifnet *ifs; 1043 int error = 0; 1044 1045 ifs = ifunit(req->ifbr_ifsname); 1046 if (ifs == NULL) 1047 return (ENOENT); 1048 if (ifs->if_ioctl == NULL) /* must be supported */ 1049 return (EINVAL); 1050 1051 /* If it's in the span list, it can't be a member. */ 1052 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1053 if (ifs == bif->bif_ifp) 1054 return (EBUSY); 1055 1056 if (ifs->if_bridge == sc) 1057 return (EEXIST); 1058 1059 if (ifs->if_bridge != NULL) 1060 return (EBUSY); 1061 1062 switch (ifs->if_type) { 1063 case IFT_ETHER: 1064 case IFT_L2VLAN: 1065 case IFT_GIF: 1066 /* permitted interface types */ 1067 break; 1068 default: 1069 return (EINVAL); 1070 } 1071 1072 #ifdef INET6 1073 /* 1074 * Two valid inet6 addresses with link-local scope must not be 1075 * on the parent interface and the member interfaces at the 1076 * same time. This restriction is needed to prevent violation 1077 * of link-local scope zone. Attempts to add a member 1078 * interface which has inet6 addresses when the parent has 1079 * inet6 triggers removal of all inet6 addresses on the member 1080 * interface. 1081 */ 1082 1083 /* Check if the parent interface has a link-local scope addr. */ 1084 if (V_allow_llz_overlap == 0 && 1085 in6ifa_llaonifp(sc->sc_ifp) != NULL) { 1086 /* 1087 * If any, remove all inet6 addresses from the member 1088 * interfaces. 1089 */ 1090 BRIDGE_XLOCK(sc); 1091 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1092 if (in6ifa_llaonifp(bif->bif_ifp)) { 1093 BRIDGE_UNLOCK(sc); 1094 in6_ifdetach(bif->bif_ifp); 1095 BRIDGE_LOCK(sc); 1096 if_printf(sc->sc_ifp, 1097 "IPv6 addresses on %s have been removed " 1098 "before adding it as a member to prevent " 1099 "IPv6 address scope violation.\n", 1100 bif->bif_ifp->if_xname); 1101 } 1102 } 1103 BRIDGE_XDROP(sc); 1104 if (in6ifa_llaonifp(ifs)) { 1105 BRIDGE_UNLOCK(sc); 1106 in6_ifdetach(ifs); 1107 BRIDGE_LOCK(sc); 1108 if_printf(sc->sc_ifp, 1109 "IPv6 addresses on %s have been removed " 1110 "before adding it as a member to prevent " 1111 "IPv6 address scope violation.\n", 1112 ifs->if_xname); 1113 } 1114 } 1115 #endif 1116 /* Allow the first Ethernet member to define the MTU */ 1117 if (LIST_EMPTY(&sc->sc_iflist)) 1118 sc->sc_ifp->if_mtu = ifs->if_mtu; 1119 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1120 if_printf(sc->sc_ifp, "invalid MTU: %lu(%s) != %lu\n", 1121 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu); 1122 return (EINVAL); 1123 } 1124 1125 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1126 if (bif == NULL) 1127 return (ENOMEM); 1128 1129 bif->bif_ifp = ifs; 1130 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1131 bif->bif_savedcaps = ifs->if_capenable; 1132 1133 /* 1134 * Assign the interface's MAC address to the bridge if it's the first 1135 * member and the MAC address of the bridge has not been changed from 1136 * the default randomly generated one. 1137 */ 1138 if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) && 1139 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) { 1140 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1141 sc->sc_ifaddr = ifs; 1142 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1143 } 1144 1145 ifs->if_bridge = sc; 1146 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1147 /* 1148 * XXX: XLOCK HERE!?! 1149 * 1150 * NOTE: insert_***HEAD*** should be safe for the traversals. 1151 */ 1152 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1153 1154 /* Set interface capabilities to the intersection set of all members */ 1155 bridge_mutecaps(sc); 1156 bridge_linkcheck(sc); 1157 1158 /* Place the interface into promiscuous mode */ 1159 switch (ifs->if_type) { 1160 case IFT_ETHER: 1161 case IFT_L2VLAN: 1162 BRIDGE_UNLOCK(sc); 1163 error = ifpromisc(ifs, 1); 1164 BRIDGE_LOCK(sc); 1165 break; 1166 } 1167 1168 if (error) 1169 bridge_delete_member(sc, bif, 0); 1170 return (error); 1171 } 1172 1173 static int 1174 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1175 { 1176 struct ifbreq *req = arg; 1177 struct bridge_iflist *bif; 1178 1179 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1180 if (bif == NULL) 1181 return (ENOENT); 1182 1183 bridge_delete_member(sc, bif, 0); 1184 1185 return (0); 1186 } 1187 1188 static int 1189 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1190 { 1191 struct ifbreq *req = arg; 1192 struct bridge_iflist *bif; 1193 struct bstp_port *bp; 1194 1195 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1196 if (bif == NULL) 1197 return (ENOENT); 1198 1199 bp = &bif->bif_stp; 1200 req->ifbr_ifsflags = bif->bif_flags; 1201 req->ifbr_state = bp->bp_state; 1202 req->ifbr_priority = bp->bp_priority; 1203 req->ifbr_path_cost = bp->bp_path_cost; 1204 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1205 req->ifbr_proto = bp->bp_protover; 1206 req->ifbr_role = bp->bp_role; 1207 req->ifbr_stpflags = bp->bp_flags; 1208 req->ifbr_addrcnt = bif->bif_addrcnt; 1209 req->ifbr_addrmax = bif->bif_addrmax; 1210 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1211 1212 /* Copy STP state options as flags */ 1213 if (bp->bp_operedge) 1214 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1215 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1216 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1217 if (bp->bp_ptp_link) 1218 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1219 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1220 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1221 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1222 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1223 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1224 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1225 return (0); 1226 } 1227 1228 static int 1229 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1230 { 1231 struct ifbreq *req = arg; 1232 struct bridge_iflist *bif; 1233 struct bstp_port *bp; 1234 int error; 1235 1236 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1237 if (bif == NULL) 1238 return (ENOENT); 1239 bp = &bif->bif_stp; 1240 1241 if (req->ifbr_ifsflags & IFBIF_SPAN) 1242 /* SPAN is readonly */ 1243 return (EINVAL); 1244 1245 if (req->ifbr_ifsflags & IFBIF_STP) { 1246 if ((bif->bif_flags & IFBIF_STP) == 0) { 1247 error = bstp_enable(&bif->bif_stp); 1248 if (error) 1249 return (error); 1250 } 1251 } else { 1252 if ((bif->bif_flags & IFBIF_STP) != 0) 1253 bstp_disable(&bif->bif_stp); 1254 } 1255 1256 /* Pass on STP flags */ 1257 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1258 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1259 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1260 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1261 1262 /* Save the bits relating to the bridge */ 1263 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1264 1265 return (0); 1266 } 1267 1268 static int 1269 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1270 { 1271 struct ifbrparam *param = arg; 1272 1273 sc->sc_brtmax = param->ifbrp_csize; 1274 bridge_rttrim(sc); 1275 1276 return (0); 1277 } 1278 1279 static int 1280 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1281 { 1282 struct ifbrparam *param = arg; 1283 1284 param->ifbrp_csize = sc->sc_brtmax; 1285 1286 return (0); 1287 } 1288 1289 static int 1290 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1291 { 1292 struct ifbifconf *bifc = arg; 1293 struct bridge_iflist *bif; 1294 struct ifbreq breq; 1295 char *buf, *outbuf; 1296 int count, buflen, len, error = 0; 1297 1298 count = 0; 1299 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1300 count++; 1301 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1302 count++; 1303 1304 buflen = sizeof(breq) * count; 1305 if (bifc->ifbic_len == 0) { 1306 bifc->ifbic_len = buflen; 1307 return (0); 1308 } 1309 BRIDGE_UNLOCK(sc); 1310 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1311 BRIDGE_LOCK(sc); 1312 1313 count = 0; 1314 buf = outbuf; 1315 len = min(bifc->ifbic_len, buflen); 1316 bzero(&breq, sizeof(breq)); 1317 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1318 if (len < sizeof(breq)) 1319 break; 1320 1321 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1322 sizeof(breq.ifbr_ifsname)); 1323 /* Fill in the ifbreq structure */ 1324 error = bridge_ioctl_gifflags(sc, &breq); 1325 if (error) 1326 break; 1327 memcpy(buf, &breq, sizeof(breq)); 1328 count++; 1329 buf += sizeof(breq); 1330 len -= sizeof(breq); 1331 } 1332 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1333 if (len < sizeof(breq)) 1334 break; 1335 1336 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1337 sizeof(breq.ifbr_ifsname)); 1338 breq.ifbr_ifsflags = bif->bif_flags; 1339 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1340 memcpy(buf, &breq, sizeof(breq)); 1341 count++; 1342 buf += sizeof(breq); 1343 len -= sizeof(breq); 1344 } 1345 1346 BRIDGE_UNLOCK(sc); 1347 bifc->ifbic_len = sizeof(breq) * count; 1348 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1349 BRIDGE_LOCK(sc); 1350 free(outbuf, M_TEMP); 1351 return (error); 1352 } 1353 1354 static int 1355 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1356 { 1357 struct ifbaconf *bac = arg; 1358 struct bridge_rtnode *brt; 1359 struct ifbareq bareq; 1360 char *buf, *outbuf; 1361 int count, buflen, len, error = 0; 1362 1363 if (bac->ifbac_len == 0) 1364 return (0); 1365 1366 count = 0; 1367 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1368 count++; 1369 buflen = sizeof(bareq) * count; 1370 1371 BRIDGE_UNLOCK(sc); 1372 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1373 BRIDGE_LOCK(sc); 1374 1375 count = 0; 1376 buf = outbuf; 1377 len = min(bac->ifbac_len, buflen); 1378 bzero(&bareq, sizeof(bareq)); 1379 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1380 if (len < sizeof(bareq)) 1381 goto out; 1382 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1383 sizeof(bareq.ifba_ifsname)); 1384 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1385 bareq.ifba_vlan = brt->brt_vlan; 1386 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1387 time_uptime < brt->brt_expire) 1388 bareq.ifba_expire = brt->brt_expire - time_uptime; 1389 else 1390 bareq.ifba_expire = 0; 1391 bareq.ifba_flags = brt->brt_flags; 1392 1393 memcpy(buf, &bareq, sizeof(bareq)); 1394 count++; 1395 buf += sizeof(bareq); 1396 len -= sizeof(bareq); 1397 } 1398 out: 1399 BRIDGE_UNLOCK(sc); 1400 bac->ifbac_len = sizeof(bareq) * count; 1401 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1402 BRIDGE_LOCK(sc); 1403 free(outbuf, M_TEMP); 1404 return (error); 1405 } 1406 1407 static int 1408 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1409 { 1410 struct ifbareq *req = arg; 1411 struct bridge_iflist *bif; 1412 int error; 1413 1414 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1415 if (bif == NULL) 1416 return (ENOENT); 1417 1418 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1419 req->ifba_flags); 1420 1421 return (error); 1422 } 1423 1424 static int 1425 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1426 { 1427 struct ifbrparam *param = arg; 1428 1429 sc->sc_brttimeout = param->ifbrp_ctime; 1430 return (0); 1431 } 1432 1433 static int 1434 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1435 { 1436 struct ifbrparam *param = arg; 1437 1438 param->ifbrp_ctime = sc->sc_brttimeout; 1439 return (0); 1440 } 1441 1442 static int 1443 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1444 { 1445 struct ifbareq *req = arg; 1446 1447 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1448 } 1449 1450 static int 1451 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1452 { 1453 struct ifbreq *req = arg; 1454 1455 bridge_rtflush(sc, req->ifbr_ifsflags); 1456 return (0); 1457 } 1458 1459 static int 1460 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1461 { 1462 struct ifbrparam *param = arg; 1463 struct bstp_state *bs = &sc->sc_stp; 1464 1465 param->ifbrp_prio = bs->bs_bridge_priority; 1466 return (0); 1467 } 1468 1469 static int 1470 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1471 { 1472 struct ifbrparam *param = arg; 1473 1474 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1475 } 1476 1477 static int 1478 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1479 { 1480 struct ifbrparam *param = arg; 1481 struct bstp_state *bs = &sc->sc_stp; 1482 1483 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1484 return (0); 1485 } 1486 1487 static int 1488 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1489 { 1490 struct ifbrparam *param = arg; 1491 1492 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1493 } 1494 1495 static int 1496 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1497 { 1498 struct ifbrparam *param = arg; 1499 struct bstp_state *bs = &sc->sc_stp; 1500 1501 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1502 return (0); 1503 } 1504 1505 static int 1506 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1507 { 1508 struct ifbrparam *param = arg; 1509 1510 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1511 } 1512 1513 static int 1514 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1515 { 1516 struct ifbrparam *param = arg; 1517 struct bstp_state *bs = &sc->sc_stp; 1518 1519 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1520 return (0); 1521 } 1522 1523 static int 1524 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1525 { 1526 struct ifbrparam *param = arg; 1527 1528 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1529 } 1530 1531 static int 1532 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1533 { 1534 struct ifbreq *req = arg; 1535 struct bridge_iflist *bif; 1536 1537 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1538 if (bif == NULL) 1539 return (ENOENT); 1540 1541 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1542 } 1543 1544 static int 1545 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1546 { 1547 struct ifbreq *req = arg; 1548 struct bridge_iflist *bif; 1549 1550 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1551 if (bif == NULL) 1552 return (ENOENT); 1553 1554 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1555 } 1556 1557 static int 1558 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1559 { 1560 struct ifbreq *req = arg; 1561 struct bridge_iflist *bif; 1562 1563 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1564 if (bif == NULL) 1565 return (ENOENT); 1566 1567 bif->bif_addrmax = req->ifbr_addrmax; 1568 return (0); 1569 } 1570 1571 static int 1572 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1573 { 1574 struct ifbreq *req = arg; 1575 struct bridge_iflist *bif = NULL; 1576 struct ifnet *ifs; 1577 1578 ifs = ifunit(req->ifbr_ifsname); 1579 if (ifs == NULL) 1580 return (ENOENT); 1581 1582 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1583 if (ifs == bif->bif_ifp) 1584 return (EBUSY); 1585 1586 if (ifs->if_bridge != NULL) 1587 return (EBUSY); 1588 1589 switch (ifs->if_type) { 1590 case IFT_ETHER: 1591 case IFT_GIF: 1592 case IFT_L2VLAN: 1593 break; 1594 default: 1595 return (EINVAL); 1596 } 1597 1598 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1599 if (bif == NULL) 1600 return (ENOMEM); 1601 1602 bif->bif_ifp = ifs; 1603 bif->bif_flags = IFBIF_SPAN; 1604 1605 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1606 1607 return (0); 1608 } 1609 1610 static int 1611 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1612 { 1613 struct ifbreq *req = arg; 1614 struct bridge_iflist *bif; 1615 struct ifnet *ifs; 1616 1617 ifs = ifunit(req->ifbr_ifsname); 1618 if (ifs == NULL) 1619 return (ENOENT); 1620 1621 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1622 if (ifs == bif->bif_ifp) 1623 break; 1624 1625 if (bif == NULL) 1626 return (ENOENT); 1627 1628 bridge_delete_span(sc, bif); 1629 1630 return (0); 1631 } 1632 1633 static int 1634 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1635 { 1636 struct ifbropreq *req = arg; 1637 struct bstp_state *bs = &sc->sc_stp; 1638 struct bstp_port *root_port; 1639 1640 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1641 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1642 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1643 1644 root_port = bs->bs_root_port; 1645 if (root_port == NULL) 1646 req->ifbop_root_port = 0; 1647 else 1648 req->ifbop_root_port = root_port->bp_ifp->if_index; 1649 1650 req->ifbop_holdcount = bs->bs_txholdcount; 1651 req->ifbop_priority = bs->bs_bridge_priority; 1652 req->ifbop_protocol = bs->bs_protover; 1653 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1654 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1655 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1656 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1657 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1658 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1659 1660 return (0); 1661 } 1662 1663 static int 1664 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1665 { 1666 struct ifbrparam *param = arg; 1667 1668 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1669 return (0); 1670 } 1671 1672 static int 1673 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1674 { 1675 struct ifbpstpconf *bifstp = arg; 1676 struct bridge_iflist *bif; 1677 struct bstp_port *bp; 1678 struct ifbpstpreq bpreq; 1679 char *buf, *outbuf; 1680 int count, buflen, len, error = 0; 1681 1682 count = 0; 1683 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1684 if ((bif->bif_flags & IFBIF_STP) != 0) 1685 count++; 1686 } 1687 1688 buflen = sizeof(bpreq) * count; 1689 if (bifstp->ifbpstp_len == 0) { 1690 bifstp->ifbpstp_len = buflen; 1691 return (0); 1692 } 1693 1694 BRIDGE_UNLOCK(sc); 1695 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1696 BRIDGE_LOCK(sc); 1697 1698 count = 0; 1699 buf = outbuf; 1700 len = min(bifstp->ifbpstp_len, buflen); 1701 bzero(&bpreq, sizeof(bpreq)); 1702 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1703 if (len < sizeof(bpreq)) 1704 break; 1705 1706 if ((bif->bif_flags & IFBIF_STP) == 0) 1707 continue; 1708 1709 bp = &bif->bif_stp; 1710 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1711 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1712 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1713 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1714 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1715 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1716 1717 memcpy(buf, &bpreq, sizeof(bpreq)); 1718 count++; 1719 buf += sizeof(bpreq); 1720 len -= sizeof(bpreq); 1721 } 1722 1723 BRIDGE_UNLOCK(sc); 1724 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1725 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1726 BRIDGE_LOCK(sc); 1727 free(outbuf, M_TEMP); 1728 return (error); 1729 } 1730 1731 static int 1732 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1733 { 1734 struct ifbrparam *param = arg; 1735 1736 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1737 } 1738 1739 static int 1740 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1741 { 1742 struct ifbrparam *param = arg; 1743 1744 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1745 } 1746 1747 /* 1748 * bridge_ifdetach: 1749 * 1750 * Detach an interface from a bridge. Called when a member 1751 * interface is detaching. 1752 */ 1753 static void 1754 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1755 { 1756 struct bridge_softc *sc = ifp->if_bridge; 1757 struct bridge_iflist *bif; 1758 1759 if (ifp->if_flags & IFF_RENAMING) 1760 return; 1761 1762 /* Check if the interface is a bridge member */ 1763 if (sc != NULL) { 1764 BRIDGE_LOCK(sc); 1765 1766 bif = bridge_lookup_member_if(sc, ifp); 1767 if (bif != NULL) 1768 bridge_delete_member(sc, bif, 1); 1769 1770 BRIDGE_UNLOCK(sc); 1771 return; 1772 } 1773 1774 /* Check if the interface is a span port */ 1775 mtx_lock(&bridge_list_mtx); 1776 LIST_FOREACH(sc, &bridge_list, sc_list) { 1777 BRIDGE_LOCK(sc); 1778 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1779 if (ifp == bif->bif_ifp) { 1780 bridge_delete_span(sc, bif); 1781 break; 1782 } 1783 1784 BRIDGE_UNLOCK(sc); 1785 } 1786 mtx_unlock(&bridge_list_mtx); 1787 } 1788 1789 /* 1790 * bridge_init: 1791 * 1792 * Initialize a bridge interface. 1793 */ 1794 static void 1795 bridge_init(void *xsc) 1796 { 1797 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1798 struct ifnet *ifp = sc->sc_ifp; 1799 1800 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1801 return; 1802 1803 BRIDGE_LOCK(sc); 1804 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1805 bridge_timer, sc); 1806 1807 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1808 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1809 1810 BRIDGE_UNLOCK(sc); 1811 } 1812 1813 /* 1814 * bridge_stop: 1815 * 1816 * Stop the bridge interface. 1817 */ 1818 static void 1819 bridge_stop(struct ifnet *ifp, int disable) 1820 { 1821 struct bridge_softc *sc = ifp->if_softc; 1822 1823 BRIDGE_LOCK_ASSERT(sc); 1824 1825 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1826 return; 1827 1828 callout_stop(&sc->sc_brcallout); 1829 bstp_stop(&sc->sc_stp); 1830 1831 bridge_rtflush(sc, IFBF_FLUSHDYN); 1832 1833 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1834 } 1835 1836 /* 1837 * bridge_enqueue: 1838 * 1839 * Enqueue a packet on a bridge member interface. 1840 * 1841 */ 1842 static int 1843 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1844 { 1845 int len, err = 0; 1846 short mflags; 1847 struct mbuf *m0; 1848 1849 /* We may be sending a fragment so traverse the mbuf */ 1850 for (; m; m = m0) { 1851 m0 = m->m_nextpkt; 1852 m->m_nextpkt = NULL; 1853 len = m->m_pkthdr.len; 1854 mflags = m->m_flags; 1855 1856 /* 1857 * If underlying interface can not do VLAN tag insertion itself 1858 * then attach a packet tag that holds it. 1859 */ 1860 if ((m->m_flags & M_VLANTAG) && 1861 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1862 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1863 if (m == NULL) { 1864 if_printf(dst_ifp, 1865 "unable to prepend VLAN header\n"); 1866 dst_ifp->if_oerrors++; 1867 continue; 1868 } 1869 m->m_flags &= ~M_VLANTAG; 1870 } 1871 1872 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */ 1873 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 1874 m_freem(m0); 1875 sc->sc_ifp->if_oerrors++; 1876 break; 1877 } 1878 1879 sc->sc_ifp->if_opackets++; 1880 sc->sc_ifp->if_obytes += len; 1881 if (mflags & M_MCAST) 1882 sc->sc_ifp->if_omcasts++; 1883 } 1884 1885 return (err); 1886 } 1887 1888 /* 1889 * bridge_dummynet: 1890 * 1891 * Receive a queued packet from dummynet and pass it on to the output 1892 * interface. 1893 * 1894 * The mbuf has the Ethernet header already attached. 1895 */ 1896 static void 1897 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1898 { 1899 struct bridge_softc *sc; 1900 1901 sc = ifp->if_bridge; 1902 1903 /* 1904 * The packet didnt originate from a member interface. This should only 1905 * ever happen if a member interface is removed while packets are 1906 * queued for it. 1907 */ 1908 if (sc == NULL) { 1909 m_freem(m); 1910 return; 1911 } 1912 1913 if (PFIL_HOOKED(&V_inet_pfil_hook) 1914 #ifdef INET6 1915 || PFIL_HOOKED(&V_inet6_pfil_hook) 1916 #endif 1917 ) { 1918 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1919 return; 1920 if (m == NULL) 1921 return; 1922 } 1923 1924 bridge_enqueue(sc, ifp, m); 1925 } 1926 1927 /* 1928 * bridge_output: 1929 * 1930 * Send output from a bridge member interface. This 1931 * performs the bridging function for locally originated 1932 * packets. 1933 * 1934 * The mbuf has the Ethernet header already attached. We must 1935 * enqueue or free the mbuf before returning. 1936 */ 1937 static int 1938 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1939 struct rtentry *rt) 1940 { 1941 struct ether_header *eh; 1942 struct ifnet *dst_if; 1943 struct bridge_softc *sc; 1944 uint16_t vlan; 1945 1946 if (m->m_len < ETHER_HDR_LEN) { 1947 m = m_pullup(m, ETHER_HDR_LEN); 1948 if (m == NULL) 1949 return (0); 1950 } 1951 1952 eh = mtod(m, struct ether_header *); 1953 sc = ifp->if_bridge; 1954 vlan = VLANTAGOF(m); 1955 1956 BRIDGE_LOCK(sc); 1957 1958 /* 1959 * If bridge is down, but the original output interface is up, 1960 * go ahead and send out that interface. Otherwise, the packet 1961 * is dropped below. 1962 */ 1963 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1964 dst_if = ifp; 1965 goto sendunicast; 1966 } 1967 1968 /* 1969 * If the packet is a multicast, or we don't know a better way to 1970 * get there, send to all interfaces. 1971 */ 1972 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1973 dst_if = NULL; 1974 else 1975 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 1976 if (dst_if == NULL) { 1977 struct bridge_iflist *bif; 1978 struct mbuf *mc; 1979 int error = 0, used = 0; 1980 1981 bridge_span(sc, m); 1982 1983 BRIDGE_LOCK2REF(sc, error); 1984 if (error) { 1985 m_freem(m); 1986 return (0); 1987 } 1988 1989 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1990 dst_if = bif->bif_ifp; 1991 1992 if (dst_if->if_type == IFT_GIF) 1993 continue; 1994 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 1995 continue; 1996 1997 /* 1998 * If this is not the original output interface, 1999 * and the interface is participating in spanning 2000 * tree, make sure the port is in a state that 2001 * allows forwarding. 2002 */ 2003 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 2004 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2005 continue; 2006 2007 if (LIST_NEXT(bif, bif_next) == NULL) { 2008 used = 1; 2009 mc = m; 2010 } else { 2011 mc = m_copypacket(m, M_NOWAIT); 2012 if (mc == NULL) { 2013 sc->sc_ifp->if_oerrors++; 2014 continue; 2015 } 2016 } 2017 2018 bridge_enqueue(sc, dst_if, mc); 2019 } 2020 if (used == 0) 2021 m_freem(m); 2022 BRIDGE_UNREF(sc); 2023 return (0); 2024 } 2025 2026 sendunicast: 2027 /* 2028 * XXX Spanning tree consideration here? 2029 */ 2030 2031 bridge_span(sc, m); 2032 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2033 m_freem(m); 2034 BRIDGE_UNLOCK(sc); 2035 return (0); 2036 } 2037 2038 BRIDGE_UNLOCK(sc); 2039 bridge_enqueue(sc, dst_if, m); 2040 return (0); 2041 } 2042 2043 /* 2044 * bridge_transmit: 2045 * 2046 * Do output on a bridge. 2047 * 2048 */ 2049 static int 2050 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2051 { 2052 struct bridge_softc *sc; 2053 struct ether_header *eh; 2054 struct ifnet *dst_if; 2055 int error = 0; 2056 2057 sc = ifp->if_softc; 2058 2059 ETHER_BPF_MTAP(ifp, m); 2060 2061 eh = mtod(m, struct ether_header *); 2062 2063 BRIDGE_LOCK(sc); 2064 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2065 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) { 2066 BRIDGE_UNLOCK(sc); 2067 error = bridge_enqueue(sc, dst_if, m); 2068 } else 2069 bridge_broadcast(sc, ifp, m, 0); 2070 2071 return (error); 2072 } 2073 2074 /* 2075 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2076 */ 2077 static void 2078 bridge_qflush(struct ifnet *ifp __unused) 2079 { 2080 } 2081 2082 /* 2083 * bridge_forward: 2084 * 2085 * The forwarding function of the bridge. 2086 * 2087 * NOTE: Releases the lock on return. 2088 */ 2089 static void 2090 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2091 struct mbuf *m) 2092 { 2093 struct bridge_iflist *dbif; 2094 struct ifnet *src_if, *dst_if, *ifp; 2095 struct ether_header *eh; 2096 uint16_t vlan; 2097 uint8_t *dst; 2098 int error; 2099 2100 src_if = m->m_pkthdr.rcvif; 2101 ifp = sc->sc_ifp; 2102 2103 ifp->if_ipackets++; 2104 ifp->if_ibytes += m->m_pkthdr.len; 2105 vlan = VLANTAGOF(m); 2106 2107 if ((sbif->bif_flags & IFBIF_STP) && 2108 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2109 goto drop; 2110 2111 eh = mtod(m, struct ether_header *); 2112 dst = eh->ether_dhost; 2113 2114 /* If the interface is learning, record the address. */ 2115 if (sbif->bif_flags & IFBIF_LEARNING) { 2116 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2117 sbif, 0, IFBAF_DYNAMIC); 2118 /* 2119 * If the interface has addresses limits then deny any source 2120 * that is not in the cache. 2121 */ 2122 if (error && sbif->bif_addrmax) 2123 goto drop; 2124 } 2125 2126 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2127 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2128 goto drop; 2129 2130 /* 2131 * At this point, the port either doesn't participate 2132 * in spanning tree or it is in the forwarding state. 2133 */ 2134 2135 /* 2136 * If the packet is unicast, destined for someone on 2137 * "this" side of the bridge, drop it. 2138 */ 2139 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2140 dst_if = bridge_rtlookup(sc, dst, vlan); 2141 if (src_if == dst_if) 2142 goto drop; 2143 } else { 2144 /* 2145 * Check if its a reserved multicast address, any address 2146 * listed in 802.1D section 7.12.6 may not be forwarded by the 2147 * bridge. 2148 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2149 */ 2150 if (dst[0] == 0x01 && dst[1] == 0x80 && 2151 dst[2] == 0xc2 && dst[3] == 0x00 && 2152 dst[4] == 0x00 && dst[5] <= 0x0f) 2153 goto drop; 2154 2155 /* ...forward it to all interfaces. */ 2156 ifp->if_imcasts++; 2157 dst_if = NULL; 2158 } 2159 2160 /* 2161 * If we have a destination interface which is a member of our bridge, 2162 * OR this is a unicast packet, push it through the bpf(4) machinery. 2163 * For broadcast or multicast packets, don't bother because it will 2164 * be reinjected into ether_input. We do this before we pass the packets 2165 * through the pfil(9) framework, as it is possible that pfil(9) will 2166 * drop the packet, or possibly modify it, making it difficult to debug 2167 * firewall issues on the bridge. 2168 */ 2169 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2170 ETHER_BPF_MTAP(ifp, m); 2171 2172 /* run the packet filter */ 2173 if (PFIL_HOOKED(&V_inet_pfil_hook) 2174 #ifdef INET6 2175 || PFIL_HOOKED(&V_inet6_pfil_hook) 2176 #endif 2177 ) { 2178 BRIDGE_UNLOCK(sc); 2179 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2180 return; 2181 if (m == NULL) 2182 return; 2183 BRIDGE_LOCK(sc); 2184 } 2185 2186 if (dst_if == NULL) { 2187 bridge_broadcast(sc, src_if, m, 1); 2188 return; 2189 } 2190 2191 /* 2192 * At this point, we're dealing with a unicast frame 2193 * going to a different interface. 2194 */ 2195 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2196 goto drop; 2197 2198 dbif = bridge_lookup_member_if(sc, dst_if); 2199 if (dbif == NULL) 2200 /* Not a member of the bridge (anymore?) */ 2201 goto drop; 2202 2203 /* Private segments can not talk to each other */ 2204 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2205 goto drop; 2206 2207 if ((dbif->bif_flags & IFBIF_STP) && 2208 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2209 goto drop; 2210 2211 BRIDGE_UNLOCK(sc); 2212 2213 if (PFIL_HOOKED(&V_inet_pfil_hook) 2214 #ifdef INET6 2215 || PFIL_HOOKED(&V_inet6_pfil_hook) 2216 #endif 2217 ) { 2218 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2219 return; 2220 if (m == NULL) 2221 return; 2222 } 2223 2224 bridge_enqueue(sc, dst_if, m); 2225 return; 2226 2227 drop: 2228 BRIDGE_UNLOCK(sc); 2229 m_freem(m); 2230 } 2231 2232 /* 2233 * bridge_input: 2234 * 2235 * Receive input from a member interface. Queue the packet for 2236 * bridging if it is not for us. 2237 */ 2238 static struct mbuf * 2239 bridge_input(struct ifnet *ifp, struct mbuf *m) 2240 { 2241 struct bridge_softc *sc = ifp->if_bridge; 2242 struct bridge_iflist *bif, *bif2; 2243 struct ifnet *bifp; 2244 struct ether_header *eh; 2245 struct mbuf *mc, *mc2; 2246 uint16_t vlan; 2247 int error; 2248 2249 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2250 return (m); 2251 2252 bifp = sc->sc_ifp; 2253 vlan = VLANTAGOF(m); 2254 2255 /* 2256 * Implement support for bridge monitoring. If this flag has been 2257 * set on this interface, discard the packet once we push it through 2258 * the bpf(4) machinery, but before we do, increment the byte and 2259 * packet counters associated with this interface. 2260 */ 2261 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2262 m->m_pkthdr.rcvif = bifp; 2263 ETHER_BPF_MTAP(bifp, m); 2264 bifp->if_ipackets++; 2265 bifp->if_ibytes += m->m_pkthdr.len; 2266 m_freem(m); 2267 return (NULL); 2268 } 2269 BRIDGE_LOCK(sc); 2270 bif = bridge_lookup_member_if(sc, ifp); 2271 if (bif == NULL) { 2272 BRIDGE_UNLOCK(sc); 2273 return (m); 2274 } 2275 2276 eh = mtod(m, struct ether_header *); 2277 2278 bridge_span(sc, m); 2279 2280 if (m->m_flags & (M_BCAST|M_MCAST)) { 2281 /* Tap off 802.1D packets; they do not get forwarded. */ 2282 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2283 ETHER_ADDR_LEN) == 0) { 2284 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2285 BRIDGE_UNLOCK(sc); 2286 return (NULL); 2287 } 2288 2289 if ((bif->bif_flags & IFBIF_STP) && 2290 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2291 BRIDGE_UNLOCK(sc); 2292 return (m); 2293 } 2294 2295 /* 2296 * Make a deep copy of the packet and enqueue the copy 2297 * for bridge processing; return the original packet for 2298 * local processing. 2299 */ 2300 mc = m_dup(m, M_NOWAIT); 2301 if (mc == NULL) { 2302 BRIDGE_UNLOCK(sc); 2303 return (m); 2304 } 2305 2306 /* Perform the bridge forwarding function with the copy. */ 2307 bridge_forward(sc, bif, mc); 2308 2309 /* 2310 * Reinject the mbuf as arriving on the bridge so we have a 2311 * chance at claiming multicast packets. We can not loop back 2312 * here from ether_input as a bridge is never a member of a 2313 * bridge. 2314 */ 2315 KASSERT(bifp->if_bridge == NULL, 2316 ("loop created in bridge_input")); 2317 mc2 = m_dup(m, M_NOWAIT); 2318 if (mc2 != NULL) { 2319 /* Keep the layer3 header aligned */ 2320 int i = min(mc2->m_pkthdr.len, max_protohdr); 2321 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2322 } 2323 if (mc2 != NULL) { 2324 mc2->m_pkthdr.rcvif = bifp; 2325 (*bifp->if_input)(bifp, mc2); 2326 } 2327 2328 /* Return the original packet for local processing. */ 2329 return (m); 2330 } 2331 2332 if ((bif->bif_flags & IFBIF_STP) && 2333 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2334 BRIDGE_UNLOCK(sc); 2335 return (m); 2336 } 2337 2338 #if (defined(INET) || defined(INET6)) 2339 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2340 || ((iface)->if_carp \ 2341 && (*carp_forus_p)((iface), eh->ether_dhost)) 2342 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2343 || ((iface)->if_carp \ 2344 && (*carp_forus_p)((iface), eh->ether_shost)) 2345 #else 2346 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2347 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2348 #endif 2349 2350 #ifdef INET6 2351 # define OR_PFIL_HOOKED_INET6 \ 2352 || PFIL_HOOKED(&V_inet6_pfil_hook) 2353 #else 2354 # define OR_PFIL_HOOKED_INET6 2355 #endif 2356 2357 #define GRAB_OUR_PACKETS(iface) \ 2358 if ((iface)->if_type == IFT_GIF) \ 2359 continue; \ 2360 /* It is destined for us. */ \ 2361 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2362 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2363 ) { \ 2364 if ((iface)->if_type == IFT_BRIDGE) { \ 2365 ETHER_BPF_MTAP(iface, m); \ 2366 iface->if_ipackets++; \ 2367 iface->if_ibytes += m->m_pkthdr.len; \ 2368 /* Filter on the physical interface. */ \ 2369 if (pfil_local_phys && \ 2370 (PFIL_HOOKED(&V_inet_pfil_hook) \ 2371 OR_PFIL_HOOKED_INET6)) { \ 2372 if (bridge_pfil(&m, NULL, ifp, \ 2373 PFIL_IN) != 0 || m == NULL) { \ 2374 BRIDGE_UNLOCK(sc); \ 2375 return (NULL); \ 2376 } \ 2377 eh = mtod(m, struct ether_header *); \ 2378 } \ 2379 } \ 2380 if (bif->bif_flags & IFBIF_LEARNING) { \ 2381 error = bridge_rtupdate(sc, eh->ether_shost, \ 2382 vlan, bif, 0, IFBAF_DYNAMIC); \ 2383 if (error && bif->bif_addrmax) { \ 2384 BRIDGE_UNLOCK(sc); \ 2385 m_freem(m); \ 2386 return (NULL); \ 2387 } \ 2388 } \ 2389 m->m_pkthdr.rcvif = iface; \ 2390 BRIDGE_UNLOCK(sc); \ 2391 return (m); \ 2392 } \ 2393 \ 2394 /* We just received a packet that we sent out. */ \ 2395 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2396 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2397 ) { \ 2398 BRIDGE_UNLOCK(sc); \ 2399 m_freem(m); \ 2400 return (NULL); \ 2401 } 2402 2403 /* 2404 * Unicast. Make sure it's not for the bridge. 2405 */ 2406 do { GRAB_OUR_PACKETS(bifp) } while (0); 2407 2408 /* 2409 * Give a chance for ifp at first priority. This will help when the 2410 * packet comes through the interface like VLAN's with the same MACs 2411 * on several interfaces from the same bridge. This also will save 2412 * some CPU cycles in case the destination interface and the input 2413 * interface (eq ifp) are the same. 2414 */ 2415 do { GRAB_OUR_PACKETS(ifp) } while (0); 2416 2417 /* Now check the all bridge members. */ 2418 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2419 GRAB_OUR_PACKETS(bif2->bif_ifp) 2420 } 2421 2422 #undef OR_CARP_CHECK_WE_ARE_DST 2423 #undef OR_CARP_CHECK_WE_ARE_SRC 2424 #undef OR_PFIL_HOOKED_INET6 2425 #undef GRAB_OUR_PACKETS 2426 2427 /* Perform the bridge forwarding function. */ 2428 bridge_forward(sc, bif, m); 2429 2430 return (NULL); 2431 } 2432 2433 /* 2434 * bridge_broadcast: 2435 * 2436 * Send a frame to all interfaces that are members of 2437 * the bridge, except for the one on which the packet 2438 * arrived. 2439 * 2440 * NOTE: Releases the lock on return. 2441 */ 2442 static void 2443 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2444 struct mbuf *m, int runfilt) 2445 { 2446 struct bridge_iflist *dbif, *sbif; 2447 struct mbuf *mc; 2448 struct ifnet *dst_if; 2449 int error = 0, used = 0, i; 2450 2451 sbif = bridge_lookup_member_if(sc, src_if); 2452 2453 BRIDGE_LOCK2REF(sc, error); 2454 if (error) { 2455 m_freem(m); 2456 return; 2457 } 2458 2459 /* Filter on the bridge interface before broadcasting */ 2460 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2461 #ifdef INET6 2462 || PFIL_HOOKED(&V_inet6_pfil_hook) 2463 #endif 2464 )) { 2465 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2466 goto out; 2467 if (m == NULL) 2468 goto out; 2469 } 2470 2471 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2472 dst_if = dbif->bif_ifp; 2473 if (dst_if == src_if) 2474 continue; 2475 2476 /* Private segments can not talk to each other */ 2477 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2478 continue; 2479 2480 if ((dbif->bif_flags & IFBIF_STP) && 2481 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2482 continue; 2483 2484 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2485 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2486 continue; 2487 2488 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2489 continue; 2490 2491 if (LIST_NEXT(dbif, bif_next) == NULL) { 2492 mc = m; 2493 used = 1; 2494 } else { 2495 mc = m_dup(m, M_NOWAIT); 2496 if (mc == NULL) { 2497 sc->sc_ifp->if_oerrors++; 2498 continue; 2499 } 2500 } 2501 2502 /* 2503 * Filter on the output interface. Pass a NULL bridge interface 2504 * pointer so we do not redundantly filter on the bridge for 2505 * each interface we broadcast on. 2506 */ 2507 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2508 #ifdef INET6 2509 || PFIL_HOOKED(&V_inet6_pfil_hook) 2510 #endif 2511 )) { 2512 if (used == 0) { 2513 /* Keep the layer3 header aligned */ 2514 i = min(mc->m_pkthdr.len, max_protohdr); 2515 mc = m_copyup(mc, i, ETHER_ALIGN); 2516 if (mc == NULL) { 2517 sc->sc_ifp->if_oerrors++; 2518 continue; 2519 } 2520 } 2521 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2522 continue; 2523 if (mc == NULL) 2524 continue; 2525 } 2526 2527 bridge_enqueue(sc, dst_if, mc); 2528 } 2529 if (used == 0) 2530 m_freem(m); 2531 2532 out: 2533 BRIDGE_UNREF(sc); 2534 } 2535 2536 /* 2537 * bridge_span: 2538 * 2539 * Duplicate a packet out one or more interfaces that are in span mode, 2540 * the original mbuf is unmodified. 2541 */ 2542 static void 2543 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2544 { 2545 struct bridge_iflist *bif; 2546 struct ifnet *dst_if; 2547 struct mbuf *mc; 2548 2549 if (LIST_EMPTY(&sc->sc_spanlist)) 2550 return; 2551 2552 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2553 dst_if = bif->bif_ifp; 2554 2555 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2556 continue; 2557 2558 mc = m_copypacket(m, M_NOWAIT); 2559 if (mc == NULL) { 2560 sc->sc_ifp->if_oerrors++; 2561 continue; 2562 } 2563 2564 bridge_enqueue(sc, dst_if, mc); 2565 } 2566 } 2567 2568 /* 2569 * bridge_rtupdate: 2570 * 2571 * Add a bridge routing entry. 2572 */ 2573 static int 2574 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2575 struct bridge_iflist *bif, int setflags, uint8_t flags) 2576 { 2577 struct bridge_rtnode *brt; 2578 int error; 2579 2580 BRIDGE_LOCK_ASSERT(sc); 2581 2582 /* Check the source address is valid and not multicast. */ 2583 if (ETHER_IS_MULTICAST(dst) || 2584 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2585 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2586 return (EINVAL); 2587 2588 /* 802.1p frames map to vlan 1 */ 2589 if (vlan == 0) 2590 vlan = 1; 2591 2592 /* 2593 * A route for this destination might already exist. If so, 2594 * update it, otherwise create a new one. 2595 */ 2596 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2597 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2598 sc->sc_brtexceeded++; 2599 return (ENOSPC); 2600 } 2601 /* Check per interface address limits (if enabled) */ 2602 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2603 bif->bif_addrexceeded++; 2604 return (ENOSPC); 2605 } 2606 2607 /* 2608 * Allocate a new bridge forwarding node, and 2609 * initialize the expiration time and Ethernet 2610 * address. 2611 */ 2612 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2613 if (brt == NULL) 2614 return (ENOMEM); 2615 2616 if (bif->bif_flags & IFBIF_STICKY) 2617 brt->brt_flags = IFBAF_STICKY; 2618 else 2619 brt->brt_flags = IFBAF_DYNAMIC; 2620 2621 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2622 brt->brt_vlan = vlan; 2623 2624 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2625 uma_zfree(bridge_rtnode_zone, brt); 2626 return (error); 2627 } 2628 brt->brt_dst = bif; 2629 bif->bif_addrcnt++; 2630 } 2631 2632 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2633 brt->brt_dst != bif) { 2634 brt->brt_dst->bif_addrcnt--; 2635 brt->brt_dst = bif; 2636 brt->brt_dst->bif_addrcnt++; 2637 } 2638 2639 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2640 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2641 if (setflags) 2642 brt->brt_flags = flags; 2643 2644 return (0); 2645 } 2646 2647 /* 2648 * bridge_rtlookup: 2649 * 2650 * Lookup the destination interface for an address. 2651 */ 2652 static struct ifnet * 2653 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2654 { 2655 struct bridge_rtnode *brt; 2656 2657 BRIDGE_LOCK_ASSERT(sc); 2658 2659 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2660 return (NULL); 2661 2662 return (brt->brt_ifp); 2663 } 2664 2665 /* 2666 * bridge_rttrim: 2667 * 2668 * Trim the routine table so that we have a number 2669 * of routing entries less than or equal to the 2670 * maximum number. 2671 */ 2672 static void 2673 bridge_rttrim(struct bridge_softc *sc) 2674 { 2675 struct bridge_rtnode *brt, *nbrt; 2676 2677 BRIDGE_LOCK_ASSERT(sc); 2678 2679 /* Make sure we actually need to do this. */ 2680 if (sc->sc_brtcnt <= sc->sc_brtmax) 2681 return; 2682 2683 /* Force an aging cycle; this might trim enough addresses. */ 2684 bridge_rtage(sc); 2685 if (sc->sc_brtcnt <= sc->sc_brtmax) 2686 return; 2687 2688 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2689 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2690 bridge_rtnode_destroy(sc, brt); 2691 if (sc->sc_brtcnt <= sc->sc_brtmax) 2692 return; 2693 } 2694 } 2695 } 2696 2697 /* 2698 * bridge_timer: 2699 * 2700 * Aging timer for the bridge. 2701 */ 2702 static void 2703 bridge_timer(void *arg) 2704 { 2705 struct bridge_softc *sc = arg; 2706 2707 BRIDGE_LOCK_ASSERT(sc); 2708 2709 bridge_rtage(sc); 2710 2711 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2712 callout_reset(&sc->sc_brcallout, 2713 bridge_rtable_prune_period * hz, bridge_timer, sc); 2714 } 2715 2716 /* 2717 * bridge_rtage: 2718 * 2719 * Perform an aging cycle. 2720 */ 2721 static void 2722 bridge_rtage(struct bridge_softc *sc) 2723 { 2724 struct bridge_rtnode *brt, *nbrt; 2725 2726 BRIDGE_LOCK_ASSERT(sc); 2727 2728 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2729 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2730 if (time_uptime >= brt->brt_expire) 2731 bridge_rtnode_destroy(sc, brt); 2732 } 2733 } 2734 } 2735 2736 /* 2737 * bridge_rtflush: 2738 * 2739 * Remove all dynamic addresses from the bridge. 2740 */ 2741 static void 2742 bridge_rtflush(struct bridge_softc *sc, int full) 2743 { 2744 struct bridge_rtnode *brt, *nbrt; 2745 2746 BRIDGE_LOCK_ASSERT(sc); 2747 2748 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2749 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2750 bridge_rtnode_destroy(sc, brt); 2751 } 2752 } 2753 2754 /* 2755 * bridge_rtdaddr: 2756 * 2757 * Remove an address from the table. 2758 */ 2759 static int 2760 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2761 { 2762 struct bridge_rtnode *brt; 2763 int found = 0; 2764 2765 BRIDGE_LOCK_ASSERT(sc); 2766 2767 /* 2768 * If vlan is zero then we want to delete for all vlans so the lookup 2769 * may return more than one. 2770 */ 2771 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2772 bridge_rtnode_destroy(sc, brt); 2773 found = 1; 2774 } 2775 2776 return (found ? 0 : ENOENT); 2777 } 2778 2779 /* 2780 * bridge_rtdelete: 2781 * 2782 * Delete routes to a speicifc member interface. 2783 */ 2784 static void 2785 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2786 { 2787 struct bridge_rtnode *brt, *nbrt; 2788 2789 BRIDGE_LOCK_ASSERT(sc); 2790 2791 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2792 if (brt->brt_ifp == ifp && (full || 2793 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2794 bridge_rtnode_destroy(sc, brt); 2795 } 2796 } 2797 2798 /* 2799 * bridge_rtable_init: 2800 * 2801 * Initialize the route table for this bridge. 2802 */ 2803 static void 2804 bridge_rtable_init(struct bridge_softc *sc) 2805 { 2806 int i; 2807 2808 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2809 M_DEVBUF, M_WAITOK); 2810 2811 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2812 LIST_INIT(&sc->sc_rthash[i]); 2813 2814 sc->sc_rthash_key = arc4random(); 2815 LIST_INIT(&sc->sc_rtlist); 2816 } 2817 2818 /* 2819 * bridge_rtable_fini: 2820 * 2821 * Deconstruct the route table for this bridge. 2822 */ 2823 static void 2824 bridge_rtable_fini(struct bridge_softc *sc) 2825 { 2826 2827 KASSERT(sc->sc_brtcnt == 0, 2828 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2829 free(sc->sc_rthash, M_DEVBUF); 2830 } 2831 2832 /* 2833 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2834 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2835 */ 2836 #define mix(a, b, c) \ 2837 do { \ 2838 a -= b; a -= c; a ^= (c >> 13); \ 2839 b -= c; b -= a; b ^= (a << 8); \ 2840 c -= a; c -= b; c ^= (b >> 13); \ 2841 a -= b; a -= c; a ^= (c >> 12); \ 2842 b -= c; b -= a; b ^= (a << 16); \ 2843 c -= a; c -= b; c ^= (b >> 5); \ 2844 a -= b; a -= c; a ^= (c >> 3); \ 2845 b -= c; b -= a; b ^= (a << 10); \ 2846 c -= a; c -= b; c ^= (b >> 15); \ 2847 } while (/*CONSTCOND*/0) 2848 2849 static __inline uint32_t 2850 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2851 { 2852 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2853 2854 b += addr[5] << 8; 2855 b += addr[4]; 2856 a += addr[3] << 24; 2857 a += addr[2] << 16; 2858 a += addr[1] << 8; 2859 a += addr[0]; 2860 2861 mix(a, b, c); 2862 2863 return (c & BRIDGE_RTHASH_MASK); 2864 } 2865 2866 #undef mix 2867 2868 static int 2869 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2870 { 2871 int i, d; 2872 2873 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2874 d = ((int)a[i]) - ((int)b[i]); 2875 } 2876 2877 return (d); 2878 } 2879 2880 /* 2881 * bridge_rtnode_lookup: 2882 * 2883 * Look up a bridge route node for the specified destination. Compare the 2884 * vlan id or if zero then just return the first match. 2885 */ 2886 static struct bridge_rtnode * 2887 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2888 { 2889 struct bridge_rtnode *brt; 2890 uint32_t hash; 2891 int dir; 2892 2893 BRIDGE_LOCK_ASSERT(sc); 2894 2895 hash = bridge_rthash(sc, addr); 2896 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2897 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2898 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2899 return (brt); 2900 if (dir > 0) 2901 return (NULL); 2902 } 2903 2904 return (NULL); 2905 } 2906 2907 /* 2908 * bridge_rtnode_insert: 2909 * 2910 * Insert the specified bridge node into the route table. We 2911 * assume the entry is not already in the table. 2912 */ 2913 static int 2914 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2915 { 2916 struct bridge_rtnode *lbrt; 2917 uint32_t hash; 2918 int dir; 2919 2920 BRIDGE_LOCK_ASSERT(sc); 2921 2922 hash = bridge_rthash(sc, brt->brt_addr); 2923 2924 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2925 if (lbrt == NULL) { 2926 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2927 goto out; 2928 } 2929 2930 do { 2931 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2932 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2933 return (EEXIST); 2934 if (dir > 0) { 2935 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2936 goto out; 2937 } 2938 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2939 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2940 goto out; 2941 } 2942 lbrt = LIST_NEXT(lbrt, brt_hash); 2943 } while (lbrt != NULL); 2944 2945 #ifdef DIAGNOSTIC 2946 panic("bridge_rtnode_insert: impossible"); 2947 #endif 2948 2949 out: 2950 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2951 sc->sc_brtcnt++; 2952 2953 return (0); 2954 } 2955 2956 /* 2957 * bridge_rtnode_destroy: 2958 * 2959 * Destroy a bridge rtnode. 2960 */ 2961 static void 2962 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2963 { 2964 BRIDGE_LOCK_ASSERT(sc); 2965 2966 LIST_REMOVE(brt, brt_hash); 2967 2968 LIST_REMOVE(brt, brt_list); 2969 sc->sc_brtcnt--; 2970 brt->brt_dst->bif_addrcnt--; 2971 uma_zfree(bridge_rtnode_zone, brt); 2972 } 2973 2974 /* 2975 * bridge_rtable_expire: 2976 * 2977 * Set the expiry time for all routes on an interface. 2978 */ 2979 static void 2980 bridge_rtable_expire(struct ifnet *ifp, int age) 2981 { 2982 struct bridge_softc *sc = ifp->if_bridge; 2983 struct bridge_rtnode *brt; 2984 2985 BRIDGE_LOCK(sc); 2986 2987 /* 2988 * If the age is zero then flush, otherwise set all the expiry times to 2989 * age for the interface 2990 */ 2991 if (age == 0) 2992 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 2993 else { 2994 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2995 /* Cap the expiry time to 'age' */ 2996 if (brt->brt_ifp == ifp && 2997 brt->brt_expire > time_uptime + age && 2998 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2999 brt->brt_expire = time_uptime + age; 3000 } 3001 } 3002 BRIDGE_UNLOCK(sc); 3003 } 3004 3005 /* 3006 * bridge_state_change: 3007 * 3008 * Callback from the bridgestp code when a port changes states. 3009 */ 3010 static void 3011 bridge_state_change(struct ifnet *ifp, int state) 3012 { 3013 struct bridge_softc *sc = ifp->if_bridge; 3014 static const char *stpstates[] = { 3015 "disabled", 3016 "listening", 3017 "learning", 3018 "forwarding", 3019 "blocking", 3020 "discarding" 3021 }; 3022 3023 if (log_stp) 3024 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3025 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3026 } 3027 3028 /* 3029 * Send bridge packets through pfil if they are one of the types pfil can deal 3030 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3031 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3032 * that interface. 3033 */ 3034 static int 3035 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3036 { 3037 int snap, error, i, hlen; 3038 struct ether_header *eh1, eh2; 3039 struct ip *ip; 3040 struct llc llc1; 3041 u_int16_t ether_type; 3042 3043 snap = 0; 3044 error = -1; /* Default error if not error == 0 */ 3045 3046 #if 0 3047 /* we may return with the IP fields swapped, ensure its not shared */ 3048 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3049 #endif 3050 3051 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) 3052 return (0); /* filtering is disabled */ 3053 3054 i = min((*mp)->m_pkthdr.len, max_protohdr); 3055 if ((*mp)->m_len < i) { 3056 *mp = m_pullup(*mp, i); 3057 if (*mp == NULL) { 3058 printf("%s: m_pullup failed\n", __func__); 3059 return (-1); 3060 } 3061 } 3062 3063 eh1 = mtod(*mp, struct ether_header *); 3064 ether_type = ntohs(eh1->ether_type); 3065 3066 /* 3067 * Check for SNAP/LLC. 3068 */ 3069 if (ether_type < ETHERMTU) { 3070 struct llc *llc2 = (struct llc *)(eh1 + 1); 3071 3072 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3073 llc2->llc_dsap == LLC_SNAP_LSAP && 3074 llc2->llc_ssap == LLC_SNAP_LSAP && 3075 llc2->llc_control == LLC_UI) { 3076 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3077 snap = 1; 3078 } 3079 } 3080 3081 /* 3082 * If we're trying to filter bridge traffic, don't look at anything 3083 * other than IP and ARP traffic. If the filter doesn't understand 3084 * IPv6, don't allow IPv6 through the bridge either. This is lame 3085 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3086 * but of course we don't have an AppleTalk filter to begin with. 3087 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3088 * ARP traffic.) 3089 */ 3090 switch (ether_type) { 3091 case ETHERTYPE_ARP: 3092 case ETHERTYPE_REVARP: 3093 if (pfil_ipfw_arp == 0) 3094 return (0); /* Automatically pass */ 3095 break; 3096 3097 case ETHERTYPE_IP: 3098 #ifdef INET6 3099 case ETHERTYPE_IPV6: 3100 #endif /* INET6 */ 3101 break; 3102 default: 3103 /* 3104 * Check to see if the user wants to pass non-ip 3105 * packets, these will not be checked by pfil(9) and 3106 * passed unconditionally so the default is to drop. 3107 */ 3108 if (pfil_onlyip) 3109 goto bad; 3110 } 3111 3112 /* Run the packet through pfil before stripping link headers */ 3113 if (PFIL_HOOKED(&V_link_pfil_hook) && pfil_ipfw != 0 && 3114 dir == PFIL_OUT && ifp != NULL) { 3115 3116 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL); 3117 3118 if (*mp == NULL || error != 0) /* packet consumed by filter */ 3119 return (error); 3120 } 3121 3122 /* Strip off the Ethernet header and keep a copy. */ 3123 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3124 m_adj(*mp, ETHER_HDR_LEN); 3125 3126 /* Strip off snap header, if present */ 3127 if (snap) { 3128 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3129 m_adj(*mp, sizeof(struct llc)); 3130 } 3131 3132 /* 3133 * Check the IP header for alignment and errors 3134 */ 3135 if (dir == PFIL_IN) { 3136 switch (ether_type) { 3137 case ETHERTYPE_IP: 3138 error = bridge_ip_checkbasic(mp); 3139 break; 3140 #ifdef INET6 3141 case ETHERTYPE_IPV6: 3142 error = bridge_ip6_checkbasic(mp); 3143 break; 3144 #endif /* INET6 */ 3145 default: 3146 error = 0; 3147 } 3148 if (error) 3149 goto bad; 3150 } 3151 3152 error = 0; 3153 3154 /* 3155 * Run the packet through pfil 3156 */ 3157 switch (ether_type) { 3158 case ETHERTYPE_IP: 3159 /* 3160 * Run pfil on the member interface and the bridge, both can 3161 * be skipped by clearing pfil_member or pfil_bridge. 3162 * 3163 * Keep the order: 3164 * in_if -> bridge_if -> out_if 3165 */ 3166 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3167 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3168 dir, NULL); 3169 3170 if (*mp == NULL || error != 0) /* filter may consume */ 3171 break; 3172 3173 if (pfil_member && ifp != NULL) 3174 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, 3175 dir, NULL); 3176 3177 if (*mp == NULL || error != 0) /* filter may consume */ 3178 break; 3179 3180 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3181 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3182 dir, NULL); 3183 3184 if (*mp == NULL || error != 0) /* filter may consume */ 3185 break; 3186 3187 /* check if we need to fragment the packet */ 3188 /* bridge_fragment generates a mbuf chain of packets */ 3189 /* that already include eth headers */ 3190 if (pfil_member && ifp != NULL && dir == PFIL_OUT) { 3191 i = (*mp)->m_pkthdr.len; 3192 if (i > ifp->if_mtu) { 3193 error = bridge_fragment(ifp, mp, &eh2, snap, 3194 &llc1); 3195 return (error); 3196 } 3197 } 3198 3199 /* Recalculate the ip checksum. */ 3200 ip = mtod(*mp, struct ip *); 3201 hlen = ip->ip_hl << 2; 3202 if (hlen < sizeof(struct ip)) 3203 goto bad; 3204 if (hlen > (*mp)->m_len) { 3205 if ((*mp = m_pullup(*mp, hlen)) == 0) 3206 goto bad; 3207 ip = mtod(*mp, struct ip *); 3208 if (ip == NULL) 3209 goto bad; 3210 } 3211 ip->ip_sum = 0; 3212 if (hlen == sizeof(struct ip)) 3213 ip->ip_sum = in_cksum_hdr(ip); 3214 else 3215 ip->ip_sum = in_cksum(*mp, hlen); 3216 3217 break; 3218 #ifdef INET6 3219 case ETHERTYPE_IPV6: 3220 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3221 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3222 dir, NULL); 3223 3224 if (*mp == NULL || error != 0) /* filter may consume */ 3225 break; 3226 3227 if (pfil_member && ifp != NULL) 3228 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp, 3229 dir, NULL); 3230 3231 if (*mp == NULL || error != 0) /* filter may consume */ 3232 break; 3233 3234 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3235 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3236 dir, NULL); 3237 break; 3238 #endif 3239 default: 3240 error = 0; 3241 break; 3242 } 3243 3244 if (*mp == NULL) 3245 return (error); 3246 if (error != 0) 3247 goto bad; 3248 3249 error = -1; 3250 3251 /* 3252 * Finally, put everything back the way it was and return 3253 */ 3254 if (snap) { 3255 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 3256 if (*mp == NULL) 3257 return (error); 3258 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3259 } 3260 3261 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 3262 if (*mp == NULL) 3263 return (error); 3264 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3265 3266 return (0); 3267 3268 bad: 3269 m_freem(*mp); 3270 *mp = NULL; 3271 return (error); 3272 } 3273 3274 /* 3275 * Perform basic checks on header size since 3276 * pfil assumes ip_input has already processed 3277 * it for it. Cut-and-pasted from ip_input.c. 3278 * Given how simple the IPv6 version is, 3279 * does the IPv4 version really need to be 3280 * this complicated? 3281 * 3282 * XXX Should we update ipstat here, or not? 3283 * XXX Right now we update ipstat but not 3284 * XXX csum_counter. 3285 */ 3286 static int 3287 bridge_ip_checkbasic(struct mbuf **mp) 3288 { 3289 struct mbuf *m = *mp; 3290 struct ip *ip; 3291 int len, hlen; 3292 u_short sum; 3293 3294 if (*mp == NULL) 3295 return (-1); 3296 3297 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3298 if ((m = m_copyup(m, sizeof(struct ip), 3299 (max_linkhdr + 3) & ~3)) == NULL) { 3300 /* XXXJRT new stat, please */ 3301 KMOD_IPSTAT_INC(ips_toosmall); 3302 goto bad; 3303 } 3304 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3305 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3306 KMOD_IPSTAT_INC(ips_toosmall); 3307 goto bad; 3308 } 3309 } 3310 ip = mtod(m, struct ip *); 3311 if (ip == NULL) goto bad; 3312 3313 if (ip->ip_v != IPVERSION) { 3314 KMOD_IPSTAT_INC(ips_badvers); 3315 goto bad; 3316 } 3317 hlen = ip->ip_hl << 2; 3318 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3319 KMOD_IPSTAT_INC(ips_badhlen); 3320 goto bad; 3321 } 3322 if (hlen > m->m_len) { 3323 if ((m = m_pullup(m, hlen)) == 0) { 3324 KMOD_IPSTAT_INC(ips_badhlen); 3325 goto bad; 3326 } 3327 ip = mtod(m, struct ip *); 3328 if (ip == NULL) goto bad; 3329 } 3330 3331 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3332 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3333 } else { 3334 if (hlen == sizeof(struct ip)) { 3335 sum = in_cksum_hdr(ip); 3336 } else { 3337 sum = in_cksum(m, hlen); 3338 } 3339 } 3340 if (sum) { 3341 KMOD_IPSTAT_INC(ips_badsum); 3342 goto bad; 3343 } 3344 3345 /* Retrieve the packet length. */ 3346 len = ntohs(ip->ip_len); 3347 3348 /* 3349 * Check for additional length bogosity 3350 */ 3351 if (len < hlen) { 3352 KMOD_IPSTAT_INC(ips_badlen); 3353 goto bad; 3354 } 3355 3356 /* 3357 * Check that the amount of data in the buffers 3358 * is as at least much as the IP header would have us expect. 3359 * Drop packet if shorter than we expect. 3360 */ 3361 if (m->m_pkthdr.len < len) { 3362 KMOD_IPSTAT_INC(ips_tooshort); 3363 goto bad; 3364 } 3365 3366 /* Checks out, proceed */ 3367 *mp = m; 3368 return (0); 3369 3370 bad: 3371 *mp = m; 3372 return (-1); 3373 } 3374 3375 #ifdef INET6 3376 /* 3377 * Same as above, but for IPv6. 3378 * Cut-and-pasted from ip6_input.c. 3379 * XXX Should we update ip6stat, or not? 3380 */ 3381 static int 3382 bridge_ip6_checkbasic(struct mbuf **mp) 3383 { 3384 struct mbuf *m = *mp; 3385 struct ip6_hdr *ip6; 3386 3387 /* 3388 * If the IPv6 header is not aligned, slurp it up into a new 3389 * mbuf with space for link headers, in the event we forward 3390 * it. Otherwise, if it is aligned, make sure the entire base 3391 * IPv6 header is in the first mbuf of the chain. 3392 */ 3393 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3394 struct ifnet *inifp = m->m_pkthdr.rcvif; 3395 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3396 (max_linkhdr + 3) & ~3)) == NULL) { 3397 /* XXXJRT new stat, please */ 3398 IP6STAT_INC(ip6s_toosmall); 3399 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3400 goto bad; 3401 } 3402 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3403 struct ifnet *inifp = m->m_pkthdr.rcvif; 3404 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3405 IP6STAT_INC(ip6s_toosmall); 3406 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3407 goto bad; 3408 } 3409 } 3410 3411 ip6 = mtod(m, struct ip6_hdr *); 3412 3413 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3414 IP6STAT_INC(ip6s_badvers); 3415 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3416 goto bad; 3417 } 3418 3419 /* Checks out, proceed */ 3420 *mp = m; 3421 return (0); 3422 3423 bad: 3424 *mp = m; 3425 return (-1); 3426 } 3427 #endif /* INET6 */ 3428 3429 /* 3430 * bridge_fragment: 3431 * 3432 * Fragment mbuf chain in multiple packets and prepend ethernet header. 3433 */ 3434 static int 3435 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh, 3436 int snap, struct llc *llc) 3437 { 3438 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL; 3439 struct ip *ip; 3440 int error = -1; 3441 3442 if (m->m_len < sizeof(struct ip) && 3443 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3444 goto dropit; 3445 ip = mtod(m, struct ip *); 3446 3447 m->m_pkthdr.csum_flags |= CSUM_IP; 3448 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 3449 if (error) 3450 goto dropit; 3451 3452 /* 3453 * Walk the chain and re-add the Ethernet header for 3454 * each mbuf packet. 3455 */ 3456 for (mcur = m; mcur; mcur = mcur->m_nextpkt) { 3457 nextpkt = mcur->m_nextpkt; 3458 mcur->m_nextpkt = NULL; 3459 if (snap) { 3460 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT); 3461 if (mcur == NULL) { 3462 error = ENOBUFS; 3463 if (mprev != NULL) 3464 mprev->m_nextpkt = nextpkt; 3465 goto dropit; 3466 } 3467 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc)); 3468 } 3469 3470 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT); 3471 if (mcur == NULL) { 3472 error = ENOBUFS; 3473 if (mprev != NULL) 3474 mprev->m_nextpkt = nextpkt; 3475 goto dropit; 3476 } 3477 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN); 3478 3479 /* 3480 * The previous two M_PREPEND could have inserted one or two 3481 * mbufs in front so we have to update the previous packet's 3482 * m_nextpkt. 3483 */ 3484 mcur->m_nextpkt = nextpkt; 3485 if (mprev != NULL) 3486 mprev->m_nextpkt = mcur; 3487 else { 3488 /* The first mbuf in the original chain needs to be 3489 * updated. */ 3490 *mp = mcur; 3491 } 3492 mprev = mcur; 3493 } 3494 3495 KMOD_IPSTAT_INC(ips_fragmented); 3496 return (error); 3497 3498 dropit: 3499 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */ 3500 m = mcur->m_nextpkt; 3501 m_freem(mcur); 3502 } 3503 return (error); 3504 } 3505 3506 static void 3507 bridge_linkstate(struct ifnet *ifp) 3508 { 3509 struct bridge_softc *sc = ifp->if_bridge; 3510 struct bridge_iflist *bif; 3511 3512 BRIDGE_LOCK(sc); 3513 bif = bridge_lookup_member_if(sc, ifp); 3514 if (bif == NULL) { 3515 BRIDGE_UNLOCK(sc); 3516 return; 3517 } 3518 bridge_linkcheck(sc); 3519 BRIDGE_UNLOCK(sc); 3520 3521 bstp_linkstate(&bif->bif_stp); 3522 } 3523 3524 static void 3525 bridge_linkcheck(struct bridge_softc *sc) 3526 { 3527 struct bridge_iflist *bif; 3528 int new_link, hasls; 3529 3530 BRIDGE_LOCK_ASSERT(sc); 3531 new_link = LINK_STATE_DOWN; 3532 hasls = 0; 3533 /* Our link is considered up if at least one of our ports is active */ 3534 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3535 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3536 hasls++; 3537 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3538 new_link = LINK_STATE_UP; 3539 break; 3540 } 3541 } 3542 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3543 /* If no interfaces support link-state then we default to up */ 3544 new_link = LINK_STATE_UP; 3545 } 3546 if_link_state_change(sc->sc_ifp, new_link); 3547 }
Cache object: 02c3da6ce0dfc1b0f3676a54fbdf16bc
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