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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: releng/10.3/sys/net/if_bridge.c 285016 2015-07-01 21:21:14Z kp $"); 79 80 #include "opt_inet.h" 81 #include "opt_inet6.h" 82 83 #include <sys/param.h> 84 #include <sys/mbuf.h> 85 #include <sys/malloc.h> 86 #include <sys/protosw.h> 87 #include <sys/systm.h> 88 #include <sys/jail.h> 89 #include <sys/time.h> 90 #include <sys/socket.h> /* for net/if.h */ 91 #include <sys/sockio.h> 92 #include <sys/ctype.h> /* string functions */ 93 #include <sys/kernel.h> 94 #include <sys/random.h> 95 #include <sys/syslog.h> 96 #include <sys/sysctl.h> 97 #include <vm/uma.h> 98 #include <sys/module.h> 99 #include <sys/priv.h> 100 #include <sys/proc.h> 101 #include <sys/lock.h> 102 #include <sys/mutex.h> 103 104 #include <net/bpf.h> 105 #include <net/if.h> 106 #include <net/if_clone.h> 107 #include <net/if_dl.h> 108 #include <net/if_types.h> 109 #include <net/if_var.h> 110 #include <net/pfil.h> 111 #include <net/vnet.h> 112 113 #include <netinet/in.h> /* for struct arpcom */ 114 #include <netinet/in_systm.h> 115 #include <netinet/in_var.h> 116 #include <netinet/ip.h> 117 #include <netinet/ip_var.h> 118 #ifdef INET6 119 #include <netinet/ip6.h> 120 #include <netinet6/ip6_var.h> 121 #include <netinet6/in6_ifattach.h> 122 #endif 123 #if defined(INET) || defined(INET6) 124 #include <netinet/ip_carp.h> 125 #endif 126 #include <machine/in_cksum.h> 127 #include <netinet/if_ether.h> /* for struct arpcom */ 128 #include <net/bridgestp.h> 129 #include <net/if_bridgevar.h> 130 #include <net/if_llc.h> 131 #include <net/if_vlan_var.h> 132 133 #include <net/route.h> 134 135 /* 136 * Size of the route hash table. Must be a power of two. 137 */ 138 #ifndef BRIDGE_RTHASH_SIZE 139 #define BRIDGE_RTHASH_SIZE 1024 140 #endif 141 142 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 143 144 /* 145 * Default maximum number of addresses to cache. 146 */ 147 #ifndef BRIDGE_RTABLE_MAX 148 #define BRIDGE_RTABLE_MAX 2000 149 #endif 150 151 /* 152 * Timeout (in seconds) for entries learned dynamically. 153 */ 154 #ifndef BRIDGE_RTABLE_TIMEOUT 155 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 156 #endif 157 158 /* 159 * Number of seconds between walks of the route list. 160 */ 161 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 162 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 163 #endif 164 165 /* 166 * List of capabilities to possibly mask on the member interface. 167 */ 168 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM) 169 170 /* 171 * List of capabilities to strip 172 */ 173 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 174 175 /* 176 * Bridge interface list entry. 177 */ 178 struct bridge_iflist { 179 LIST_ENTRY(bridge_iflist) bif_next; 180 struct ifnet *bif_ifp; /* member if */ 181 struct bstp_port bif_stp; /* STP state */ 182 uint32_t bif_flags; /* member if flags */ 183 int bif_savedcaps; /* saved capabilities */ 184 uint32_t bif_addrmax; /* max # of addresses */ 185 uint32_t bif_addrcnt; /* cur. # of addresses */ 186 uint32_t bif_addrexceeded;/* # of address violations */ 187 }; 188 189 /* 190 * Bridge route node. 191 */ 192 struct bridge_rtnode { 193 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 194 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 195 struct bridge_iflist *brt_dst; /* destination if */ 196 unsigned long brt_expire; /* expiration time */ 197 uint8_t brt_flags; /* address flags */ 198 uint8_t brt_addr[ETHER_ADDR_LEN]; 199 uint16_t brt_vlan; /* vlan id */ 200 }; 201 #define brt_ifp brt_dst->bif_ifp 202 203 /* 204 * Software state for each bridge. 205 */ 206 struct bridge_softc { 207 struct ifnet *sc_ifp; /* make this an interface */ 208 LIST_ENTRY(bridge_softc) sc_list; 209 struct mtx sc_mtx; 210 struct cv sc_cv; 211 uint32_t sc_brtmax; /* max # of addresses */ 212 uint32_t sc_brtcnt; /* cur. # of addresses */ 213 uint32_t sc_brttimeout; /* rt timeout in seconds */ 214 struct callout sc_brcallout; /* bridge callout */ 215 uint32_t sc_iflist_ref; /* refcount for sc_iflist */ 216 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ 217 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 218 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 219 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 220 uint32_t sc_rthash_key; /* key for hash */ 221 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 222 struct bstp_state sc_stp; /* STP state */ 223 uint32_t sc_brtexceeded; /* # of cache drops */ 224 struct ifnet *sc_ifaddr; /* member mac copied from */ 225 u_char sc_defaddr[6]; /* Default MAC address */ 226 }; 227 228 static struct mtx bridge_list_mtx; 229 eventhandler_tag bridge_detach_cookie = NULL; 230 231 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 232 233 uma_zone_t bridge_rtnode_zone; 234 235 static int bridge_clone_create(struct if_clone *, int, caddr_t); 236 static void bridge_clone_destroy(struct ifnet *); 237 238 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 239 static void bridge_mutecaps(struct bridge_softc *); 240 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 241 int); 242 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 243 static void bridge_init(void *); 244 static void bridge_dummynet(struct mbuf *, struct ifnet *); 245 static void bridge_stop(struct ifnet *, int); 246 static int bridge_transmit(struct ifnet *, struct mbuf *); 247 static void bridge_qflush(struct ifnet *); 248 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 249 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 250 struct rtentry *); 251 static int bridge_enqueue(struct bridge_softc *, struct ifnet *, 252 struct mbuf *); 253 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 254 255 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 256 struct mbuf *m); 257 258 static void bridge_timer(void *); 259 260 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 261 struct mbuf *, int); 262 static void bridge_span(struct bridge_softc *, struct mbuf *); 263 264 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 265 uint16_t, struct bridge_iflist *, int, uint8_t); 266 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 267 uint16_t); 268 static void bridge_rttrim(struct bridge_softc *); 269 static void bridge_rtage(struct bridge_softc *); 270 static void bridge_rtflush(struct bridge_softc *, int); 271 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 272 uint16_t); 273 274 static void bridge_rtable_init(struct bridge_softc *); 275 static void bridge_rtable_fini(struct bridge_softc *); 276 277 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 278 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 279 const uint8_t *, uint16_t); 280 static int bridge_rtnode_insert(struct bridge_softc *, 281 struct bridge_rtnode *); 282 static void bridge_rtnode_destroy(struct bridge_softc *, 283 struct bridge_rtnode *); 284 static void bridge_rtable_expire(struct ifnet *, int); 285 static void bridge_state_change(struct ifnet *, int); 286 287 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 288 const char *name); 289 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 290 struct ifnet *ifp); 291 static void bridge_delete_member(struct bridge_softc *, 292 struct bridge_iflist *, int); 293 static void bridge_delete_span(struct bridge_softc *, 294 struct bridge_iflist *); 295 296 static int bridge_ioctl_add(struct bridge_softc *, void *); 297 static int bridge_ioctl_del(struct bridge_softc *, void *); 298 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 299 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 300 static int bridge_ioctl_scache(struct bridge_softc *, void *); 301 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 302 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 303 static int bridge_ioctl_rts(struct bridge_softc *, void *); 304 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 305 static int bridge_ioctl_sto(struct bridge_softc *, void *); 306 static int bridge_ioctl_gto(struct bridge_softc *, void *); 307 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 308 static int bridge_ioctl_flush(struct bridge_softc *, void *); 309 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 310 static int bridge_ioctl_spri(struct bridge_softc *, void *); 311 static int bridge_ioctl_ght(struct bridge_softc *, void *); 312 static int bridge_ioctl_sht(struct bridge_softc *, void *); 313 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 314 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 315 static int bridge_ioctl_gma(struct bridge_softc *, void *); 316 static int bridge_ioctl_sma(struct bridge_softc *, void *); 317 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 318 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 319 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 320 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 321 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 322 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 323 static int bridge_ioctl_grte(struct bridge_softc *, void *); 324 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 325 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 326 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 327 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 328 int); 329 static int bridge_ip_checkbasic(struct mbuf **mp); 330 #ifdef INET6 331 static int bridge_ip6_checkbasic(struct mbuf **mp); 332 #endif /* INET6 */ 333 static int bridge_fragment(struct ifnet *, struct mbuf *, 334 struct ether_header *, int, struct llc *); 335 static void bridge_linkstate(struct ifnet *ifp); 336 static void bridge_linkcheck(struct bridge_softc *sc); 337 338 extern void (*bridge_linkstate_p)(struct ifnet *ifp); 339 340 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 341 #define VLANTAGOF(_m) \ 342 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 343 344 static struct bstp_cb_ops bridge_ops = { 345 .bcb_state = bridge_state_change, 346 .bcb_rtage = bridge_rtable_expire 347 }; 348 349 SYSCTL_DECL(_net_link); 350 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 351 352 static int pfil_onlyip = 1; /* only pass IP[46] packets when pfil is enabled */ 353 static int pfil_bridge = 1; /* run pfil hooks on the bridge interface */ 354 static int pfil_member = 1; /* run pfil hooks on the member interface */ 355 static int pfil_ipfw = 0; /* layer2 filter with ipfw */ 356 static int pfil_ipfw_arp = 0; /* layer2 filter with ipfw */ 357 static int pfil_local_phys = 0; /* run pfil hooks on the physical interface for 358 locally destined packets */ 359 static int log_stp = 0; /* log STP state changes */ 360 static int bridge_inherit_mac = 0; /* share MAC with first bridge member */ 361 TUNABLE_INT("net.link.bridge.pfil_onlyip", &pfil_onlyip); 362 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, CTLFLAG_RW, 363 &pfil_onlyip, 0, "Only pass IP packets when pfil is enabled"); 364 TUNABLE_INT("net.link.bridge.ipfw_arp", &pfil_ipfw_arp); 365 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, CTLFLAG_RW, 366 &pfil_ipfw_arp, 0, "Filter ARP packets through IPFW layer2"); 367 TUNABLE_INT("net.link.bridge.pfil_bridge", &pfil_bridge); 368 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, CTLFLAG_RW, 369 &pfil_bridge, 0, "Packet filter on the bridge interface"); 370 TUNABLE_INT("net.link.bridge.pfil_member", &pfil_member); 371 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, CTLFLAG_RW, 372 &pfil_member, 0, "Packet filter on the member interface"); 373 TUNABLE_INT("net.link.bridge.pfil_local_phys", &pfil_local_phys); 374 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, CTLFLAG_RW, 375 &pfil_local_phys, 0, 376 "Packet filter on the physical interface for locally destined packets"); 377 TUNABLE_INT("net.link.bridge.log_stp", &log_stp); 378 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, CTLFLAG_RW, 379 &log_stp, 0, "Log STP state changes"); 380 TUNABLE_INT("net.link.bridge.inherit_mac", &bridge_inherit_mac); 381 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, CTLFLAG_RW, 382 &bridge_inherit_mac, 0, 383 "Inherit MAC address from the first bridge member"); 384 385 static VNET_DEFINE(int, allow_llz_overlap) = 0; 386 #define V_allow_llz_overlap VNET(allow_llz_overlap) 387 SYSCTL_VNET_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, CTLFLAG_RW, 388 &VNET_NAME(allow_llz_overlap), 0, "Allow overlap of link-local scope " 389 "zones of a bridge interface and the member interfaces"); 390 391 struct bridge_control { 392 int (*bc_func)(struct bridge_softc *, void *); 393 int bc_argsize; 394 int bc_flags; 395 }; 396 397 #define BC_F_COPYIN 0x01 /* copy arguments in */ 398 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 399 #define BC_F_SUSER 0x04 /* do super-user check */ 400 401 const struct bridge_control bridge_control_table[] = { 402 { bridge_ioctl_add, sizeof(struct ifbreq), 403 BC_F_COPYIN|BC_F_SUSER }, 404 { bridge_ioctl_del, sizeof(struct ifbreq), 405 BC_F_COPYIN|BC_F_SUSER }, 406 407 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 408 BC_F_COPYIN|BC_F_COPYOUT }, 409 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 410 BC_F_COPYIN|BC_F_SUSER }, 411 412 { bridge_ioctl_scache, sizeof(struct ifbrparam), 413 BC_F_COPYIN|BC_F_SUSER }, 414 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 415 BC_F_COPYOUT }, 416 417 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 418 BC_F_COPYIN|BC_F_COPYOUT }, 419 { bridge_ioctl_rts, sizeof(struct ifbaconf), 420 BC_F_COPYIN|BC_F_COPYOUT }, 421 422 { bridge_ioctl_saddr, sizeof(struct ifbareq), 423 BC_F_COPYIN|BC_F_SUSER }, 424 425 { bridge_ioctl_sto, sizeof(struct ifbrparam), 426 BC_F_COPYIN|BC_F_SUSER }, 427 { bridge_ioctl_gto, sizeof(struct ifbrparam), 428 BC_F_COPYOUT }, 429 430 { bridge_ioctl_daddr, sizeof(struct ifbareq), 431 BC_F_COPYIN|BC_F_SUSER }, 432 433 { bridge_ioctl_flush, sizeof(struct ifbreq), 434 BC_F_COPYIN|BC_F_SUSER }, 435 436 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 437 BC_F_COPYOUT }, 438 { bridge_ioctl_spri, sizeof(struct ifbrparam), 439 BC_F_COPYIN|BC_F_SUSER }, 440 441 { bridge_ioctl_ght, sizeof(struct ifbrparam), 442 BC_F_COPYOUT }, 443 { bridge_ioctl_sht, sizeof(struct ifbrparam), 444 BC_F_COPYIN|BC_F_SUSER }, 445 446 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 447 BC_F_COPYOUT }, 448 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 449 BC_F_COPYIN|BC_F_SUSER }, 450 451 { bridge_ioctl_gma, sizeof(struct ifbrparam), 452 BC_F_COPYOUT }, 453 { bridge_ioctl_sma, sizeof(struct ifbrparam), 454 BC_F_COPYIN|BC_F_SUSER }, 455 456 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 457 BC_F_COPYIN|BC_F_SUSER }, 458 459 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 460 BC_F_COPYIN|BC_F_SUSER }, 461 462 { bridge_ioctl_addspan, sizeof(struct ifbreq), 463 BC_F_COPYIN|BC_F_SUSER }, 464 { bridge_ioctl_delspan, sizeof(struct ifbreq), 465 BC_F_COPYIN|BC_F_SUSER }, 466 467 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 468 BC_F_COPYOUT }, 469 470 { bridge_ioctl_grte, sizeof(struct ifbrparam), 471 BC_F_COPYOUT }, 472 473 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 474 BC_F_COPYIN|BC_F_COPYOUT }, 475 476 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 477 BC_F_COPYIN|BC_F_SUSER }, 478 479 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 480 BC_F_COPYIN|BC_F_SUSER }, 481 482 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 483 BC_F_COPYIN|BC_F_SUSER }, 484 485 }; 486 const int bridge_control_table_size = 487 sizeof(bridge_control_table) / sizeof(bridge_control_table[0]); 488 489 LIST_HEAD(, bridge_softc) bridge_list; 490 491 static struct if_clone *bridge_cloner; 492 static const char bridge_name[] = "bridge"; 493 494 static int 495 bridge_modevent(module_t mod, int type, void *data) 496 { 497 498 switch (type) { 499 case MOD_LOAD: 500 mtx_init(&bridge_list_mtx, "if_bridge list", NULL, MTX_DEF); 501 bridge_cloner = if_clone_simple(bridge_name, 502 bridge_clone_create, bridge_clone_destroy, 0); 503 bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 504 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 505 UMA_ALIGN_PTR, 0); 506 LIST_INIT(&bridge_list); 507 bridge_input_p = bridge_input; 508 bridge_output_p = bridge_output; 509 bridge_dn_p = bridge_dummynet; 510 bridge_linkstate_p = bridge_linkstate; 511 bridge_detach_cookie = EVENTHANDLER_REGISTER( 512 ifnet_departure_event, bridge_ifdetach, NULL, 513 EVENTHANDLER_PRI_ANY); 514 break; 515 case MOD_UNLOAD: 516 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 517 bridge_detach_cookie); 518 if_clone_detach(bridge_cloner); 519 uma_zdestroy(bridge_rtnode_zone); 520 bridge_input_p = NULL; 521 bridge_output_p = NULL; 522 bridge_dn_p = NULL; 523 bridge_linkstate_p = NULL; 524 mtx_destroy(&bridge_list_mtx); 525 break; 526 default: 527 return (EOPNOTSUPP); 528 } 529 return (0); 530 } 531 532 static moduledata_t bridge_mod = { 533 "if_bridge", 534 bridge_modevent, 535 0 536 }; 537 538 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 539 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 540 541 /* 542 * handler for net.link.bridge.ipfw 543 */ 544 static int 545 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 546 { 547 int enable = pfil_ipfw; 548 int error; 549 550 error = sysctl_handle_int(oidp, &enable, 0, req); 551 enable = (enable) ? 1 : 0; 552 553 if (enable != pfil_ipfw) { 554 pfil_ipfw = enable; 555 556 /* 557 * Disable pfil so that ipfw doesnt run twice, if the user 558 * really wants both then they can re-enable pfil_bridge and/or 559 * pfil_member. Also allow non-ip packets as ipfw can filter by 560 * layer2 type. 561 */ 562 if (pfil_ipfw) { 563 pfil_onlyip = 0; 564 pfil_bridge = 0; 565 pfil_member = 0; 566 } 567 } 568 569 return (error); 570 } 571 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, CTLTYPE_INT|CTLFLAG_RW, 572 &pfil_ipfw, 0, &sysctl_pfil_ipfw, "I", "Layer2 filter with IPFW"); 573 574 /* 575 * bridge_clone_create: 576 * 577 * Create a new bridge instance. 578 */ 579 static int 580 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 581 { 582 struct bridge_softc *sc, *sc2; 583 struct ifnet *bifp, *ifp; 584 int fb, retry; 585 unsigned long hostid; 586 587 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 588 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 589 if (ifp == NULL) { 590 free(sc, M_DEVBUF); 591 return (ENOSPC); 592 } 593 594 BRIDGE_LOCK_INIT(sc); 595 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 596 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 597 598 /* Initialize our routing table. */ 599 bridge_rtable_init(sc); 600 601 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 602 603 LIST_INIT(&sc->sc_iflist); 604 LIST_INIT(&sc->sc_spanlist); 605 606 ifp->if_softc = sc; 607 if_initname(ifp, bridge_name, unit); 608 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 609 ifp->if_ioctl = bridge_ioctl; 610 ifp->if_transmit = bridge_transmit; 611 ifp->if_qflush = bridge_qflush; 612 ifp->if_init = bridge_init; 613 ifp->if_type = IFT_BRIDGE; 614 615 /* 616 * Generate an ethernet address with a locally administered address. 617 * 618 * Since we are using random ethernet addresses for the bridge, it is 619 * possible that we might have address collisions, so make sure that 620 * this hardware address isn't already in use on another bridge. 621 * The first try uses the hostid and falls back to arc4rand(). 622 */ 623 fb = 0; 624 getcredhostid(curthread->td_ucred, &hostid); 625 do { 626 if (fb || hostid == 0) { 627 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1); 628 sc->sc_defaddr[0] &= ~1;/* clear multicast bit */ 629 sc->sc_defaddr[0] |= 2; /* set the LAA bit */ 630 } else { 631 sc->sc_defaddr[0] = 0x2; 632 sc->sc_defaddr[1] = (hostid >> 24) & 0xff; 633 sc->sc_defaddr[2] = (hostid >> 16) & 0xff; 634 sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff; 635 sc->sc_defaddr[4] = hostid & 0xff; 636 sc->sc_defaddr[5] = ifp->if_dunit & 0xff; 637 } 638 639 fb = 1; 640 retry = 0; 641 mtx_lock(&bridge_list_mtx); 642 LIST_FOREACH(sc2, &bridge_list, sc_list) { 643 bifp = sc2->sc_ifp; 644 if (memcmp(sc->sc_defaddr, 645 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) { 646 retry = 1; 647 break; 648 } 649 } 650 mtx_unlock(&bridge_list_mtx); 651 } while (retry == 1); 652 653 bstp_attach(&sc->sc_stp, &bridge_ops); 654 ether_ifattach(ifp, sc->sc_defaddr); 655 /* Now undo some of the damage... */ 656 ifp->if_baudrate = 0; 657 ifp->if_type = IFT_BRIDGE; 658 659 mtx_lock(&bridge_list_mtx); 660 LIST_INSERT_HEAD(&bridge_list, sc, sc_list); 661 mtx_unlock(&bridge_list_mtx); 662 663 return (0); 664 } 665 666 /* 667 * bridge_clone_destroy: 668 * 669 * Destroy a bridge instance. 670 */ 671 static void 672 bridge_clone_destroy(struct ifnet *ifp) 673 { 674 struct bridge_softc *sc = ifp->if_softc; 675 struct bridge_iflist *bif; 676 677 BRIDGE_LOCK(sc); 678 679 bridge_stop(ifp, 1); 680 ifp->if_flags &= ~IFF_UP; 681 682 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 683 bridge_delete_member(sc, bif, 0); 684 685 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 686 bridge_delete_span(sc, bif); 687 } 688 689 BRIDGE_UNLOCK(sc); 690 691 callout_drain(&sc->sc_brcallout); 692 693 mtx_lock(&bridge_list_mtx); 694 LIST_REMOVE(sc, sc_list); 695 mtx_unlock(&bridge_list_mtx); 696 697 bstp_detach(&sc->sc_stp); 698 ether_ifdetach(ifp); 699 if_free(ifp); 700 701 /* Tear down the routing table. */ 702 bridge_rtable_fini(sc); 703 704 BRIDGE_LOCK_DESTROY(sc); 705 free(sc, M_DEVBUF); 706 } 707 708 /* 709 * bridge_ioctl: 710 * 711 * Handle a control request from the operator. 712 */ 713 static int 714 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 715 { 716 struct bridge_softc *sc = ifp->if_softc; 717 struct ifreq *ifr = (struct ifreq *)data; 718 struct bridge_iflist *bif; 719 struct thread *td = curthread; 720 union { 721 struct ifbreq ifbreq; 722 struct ifbifconf ifbifconf; 723 struct ifbareq ifbareq; 724 struct ifbaconf ifbaconf; 725 struct ifbrparam ifbrparam; 726 struct ifbropreq ifbropreq; 727 } args; 728 struct ifdrv *ifd = (struct ifdrv *) data; 729 const struct bridge_control *bc; 730 int error = 0; 731 732 switch (cmd) { 733 734 case SIOCADDMULTI: 735 case SIOCDELMULTI: 736 break; 737 738 case SIOCGDRVSPEC: 739 case SIOCSDRVSPEC: 740 if (ifd->ifd_cmd >= bridge_control_table_size) { 741 error = EINVAL; 742 break; 743 } 744 bc = &bridge_control_table[ifd->ifd_cmd]; 745 746 if (cmd == SIOCGDRVSPEC && 747 (bc->bc_flags & BC_F_COPYOUT) == 0) { 748 error = EINVAL; 749 break; 750 } 751 else if (cmd == SIOCSDRVSPEC && 752 (bc->bc_flags & BC_F_COPYOUT) != 0) { 753 error = EINVAL; 754 break; 755 } 756 757 if (bc->bc_flags & BC_F_SUSER) { 758 error = priv_check(td, PRIV_NET_BRIDGE); 759 if (error) 760 break; 761 } 762 763 if (ifd->ifd_len != bc->bc_argsize || 764 ifd->ifd_len > sizeof(args)) { 765 error = EINVAL; 766 break; 767 } 768 769 bzero(&args, sizeof(args)); 770 if (bc->bc_flags & BC_F_COPYIN) { 771 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 772 if (error) 773 break; 774 } 775 776 BRIDGE_LOCK(sc); 777 error = (*bc->bc_func)(sc, &args); 778 BRIDGE_UNLOCK(sc); 779 if (error) 780 break; 781 782 if (bc->bc_flags & BC_F_COPYOUT) 783 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 784 785 break; 786 787 case SIOCSIFFLAGS: 788 if (!(ifp->if_flags & IFF_UP) && 789 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 790 /* 791 * If interface is marked down and it is running, 792 * then stop and disable it. 793 */ 794 BRIDGE_LOCK(sc); 795 bridge_stop(ifp, 1); 796 BRIDGE_UNLOCK(sc); 797 } else if ((ifp->if_flags & IFF_UP) && 798 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 799 /* 800 * If interface is marked up and it is stopped, then 801 * start it. 802 */ 803 (*ifp->if_init)(sc); 804 } 805 break; 806 807 case SIOCSIFMTU: 808 if (ifr->ifr_mtu < 576) { 809 error = EINVAL; 810 break; 811 } 812 if (LIST_EMPTY(&sc->sc_iflist)) { 813 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 814 break; 815 } 816 BRIDGE_LOCK(sc); 817 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 818 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) { 819 log(LOG_NOTICE, "%s: invalid MTU: %lu(%s)" 820 " != %d\n", sc->sc_ifp->if_xname, 821 bif->bif_ifp->if_mtu, 822 bif->bif_ifp->if_xname, ifr->ifr_mtu); 823 error = EINVAL; 824 break; 825 } 826 } 827 if (!error) 828 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 829 BRIDGE_UNLOCK(sc); 830 break; 831 default: 832 /* 833 * drop the lock as ether_ioctl() will call bridge_start() and 834 * cause the lock to be recursed. 835 */ 836 error = ether_ioctl(ifp, cmd, data); 837 break; 838 } 839 840 return (error); 841 } 842 843 /* 844 * bridge_mutecaps: 845 * 846 * Clear or restore unwanted capabilities on the member interface 847 */ 848 static void 849 bridge_mutecaps(struct bridge_softc *sc) 850 { 851 struct bridge_iflist *bif; 852 int enabled, mask; 853 854 /* Initial bitmask of capabilities to test */ 855 mask = BRIDGE_IFCAPS_MASK; 856 857 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 858 /* Every member must support it or its disabled */ 859 mask &= bif->bif_savedcaps; 860 } 861 862 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 863 enabled = bif->bif_ifp->if_capenable; 864 enabled &= ~BRIDGE_IFCAPS_STRIP; 865 /* strip off mask bits and enable them again if allowed */ 866 enabled &= ~BRIDGE_IFCAPS_MASK; 867 enabled |= mask; 868 bridge_set_ifcap(sc, bif, enabled); 869 } 870 871 } 872 873 static void 874 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 875 { 876 struct ifnet *ifp = bif->bif_ifp; 877 struct ifreq ifr; 878 int error; 879 880 bzero(&ifr, sizeof(ifr)); 881 ifr.ifr_reqcap = set; 882 883 if (ifp->if_capenable != set) { 884 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 885 if (error) 886 if_printf(sc->sc_ifp, 887 "error setting interface capabilities on %s\n", 888 ifp->if_xname); 889 } 890 } 891 892 /* 893 * bridge_lookup_member: 894 * 895 * Lookup a bridge member interface. 896 */ 897 static struct bridge_iflist * 898 bridge_lookup_member(struct bridge_softc *sc, const char *name) 899 { 900 struct bridge_iflist *bif; 901 struct ifnet *ifp; 902 903 BRIDGE_LOCK_ASSERT(sc); 904 905 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 906 ifp = bif->bif_ifp; 907 if (strcmp(ifp->if_xname, name) == 0) 908 return (bif); 909 } 910 911 return (NULL); 912 } 913 914 /* 915 * bridge_lookup_member_if: 916 * 917 * Lookup a bridge member interface by ifnet*. 918 */ 919 static struct bridge_iflist * 920 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 921 { 922 struct bridge_iflist *bif; 923 924 BRIDGE_LOCK_ASSERT(sc); 925 926 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 927 if (bif->bif_ifp == member_ifp) 928 return (bif); 929 } 930 931 return (NULL); 932 } 933 934 /* 935 * bridge_delete_member: 936 * 937 * Delete the specified member interface. 938 */ 939 static void 940 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 941 int gone) 942 { 943 struct ifnet *ifs = bif->bif_ifp; 944 struct ifnet *fif = NULL; 945 946 BRIDGE_LOCK_ASSERT(sc); 947 948 if (bif->bif_flags & IFBIF_STP) 949 bstp_disable(&bif->bif_stp); 950 951 ifs->if_bridge = NULL; 952 BRIDGE_XLOCK(sc); 953 LIST_REMOVE(bif, bif_next); 954 BRIDGE_XDROP(sc); 955 956 /* 957 * If removing the interface that gave the bridge its mac address, set 958 * the mac address of the bridge to the address of the next member, or 959 * to its default address if no members are left. 960 */ 961 if (bridge_inherit_mac && sc->sc_ifaddr == ifs) { 962 if (LIST_EMPTY(&sc->sc_iflist)) { 963 bcopy(sc->sc_defaddr, 964 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 965 sc->sc_ifaddr = NULL; 966 } else { 967 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp; 968 bcopy(IF_LLADDR(fif), 969 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 970 sc->sc_ifaddr = fif; 971 } 972 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 973 } 974 975 bridge_linkcheck(sc); 976 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 977 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 978 KASSERT(bif->bif_addrcnt == 0, 979 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 980 981 BRIDGE_UNLOCK(sc); 982 if (!gone) { 983 switch (ifs->if_type) { 984 case IFT_ETHER: 985 case IFT_L2VLAN: 986 /* 987 * Take the interface out of promiscuous mode, but only 988 * if it was promiscuous in the first place. It might 989 * not be if we're in the bridge_ioctl_add() error path. 990 */ 991 if (ifs->if_flags & IFF_PROMISC) 992 (void) ifpromisc(ifs, 0); 993 break; 994 995 case IFT_GIF: 996 break; 997 998 default: 999 #ifdef DIAGNOSTIC 1000 panic("bridge_delete_member: impossible"); 1001 #endif 1002 break; 1003 } 1004 /* reneable any interface capabilities */ 1005 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 1006 } 1007 bstp_destroy(&bif->bif_stp); /* prepare to free */ 1008 BRIDGE_LOCK(sc); 1009 free(bif, M_DEVBUF); 1010 } 1011 1012 /* 1013 * bridge_delete_span: 1014 * 1015 * Delete the specified span interface. 1016 */ 1017 static void 1018 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1019 { 1020 BRIDGE_LOCK_ASSERT(sc); 1021 1022 KASSERT(bif->bif_ifp->if_bridge == NULL, 1023 ("%s: not a span interface", __func__)); 1024 1025 LIST_REMOVE(bif, bif_next); 1026 free(bif, M_DEVBUF); 1027 } 1028 1029 static int 1030 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1031 { 1032 struct ifbreq *req = arg; 1033 struct bridge_iflist *bif = NULL; 1034 struct ifnet *ifs; 1035 int error = 0; 1036 1037 ifs = ifunit(req->ifbr_ifsname); 1038 if (ifs == NULL) 1039 return (ENOENT); 1040 if (ifs->if_ioctl == NULL) /* must be supported */ 1041 return (EINVAL); 1042 1043 /* If it's in the span list, it can't be a member. */ 1044 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1045 if (ifs == bif->bif_ifp) 1046 return (EBUSY); 1047 1048 if (ifs->if_bridge == sc) 1049 return (EEXIST); 1050 1051 if (ifs->if_bridge != NULL) 1052 return (EBUSY); 1053 1054 switch (ifs->if_type) { 1055 case IFT_ETHER: 1056 case IFT_L2VLAN: 1057 case IFT_GIF: 1058 /* permitted interface types */ 1059 break; 1060 default: 1061 return (EINVAL); 1062 } 1063 1064 #ifdef INET6 1065 /* 1066 * Two valid inet6 addresses with link-local scope must not be 1067 * on the parent interface and the member interfaces at the 1068 * same time. This restriction is needed to prevent violation 1069 * of link-local scope zone. Attempts to add a member 1070 * interface which has inet6 addresses when the parent has 1071 * inet6 triggers removal of all inet6 addresses on the member 1072 * interface. 1073 */ 1074 1075 /* Check if the parent interface has a link-local scope addr. */ 1076 if (V_allow_llz_overlap == 0 && 1077 in6ifa_llaonifp(sc->sc_ifp) != NULL) { 1078 /* 1079 * If any, remove all inet6 addresses from the member 1080 * interfaces. 1081 */ 1082 BRIDGE_XLOCK(sc); 1083 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1084 if (in6ifa_llaonifp(bif->bif_ifp)) { 1085 BRIDGE_UNLOCK(sc); 1086 in6_ifdetach(bif->bif_ifp); 1087 BRIDGE_LOCK(sc); 1088 if_printf(sc->sc_ifp, 1089 "IPv6 addresses on %s have been removed " 1090 "before adding it as a member to prevent " 1091 "IPv6 address scope violation.\n", 1092 bif->bif_ifp->if_xname); 1093 } 1094 } 1095 BRIDGE_XDROP(sc); 1096 if (in6ifa_llaonifp(ifs)) { 1097 BRIDGE_UNLOCK(sc); 1098 in6_ifdetach(ifs); 1099 BRIDGE_LOCK(sc); 1100 if_printf(sc->sc_ifp, 1101 "IPv6 addresses on %s have been removed " 1102 "before adding it as a member to prevent " 1103 "IPv6 address scope violation.\n", 1104 ifs->if_xname); 1105 } 1106 } 1107 #endif 1108 /* Allow the first Ethernet member to define the MTU */ 1109 if (LIST_EMPTY(&sc->sc_iflist)) 1110 sc->sc_ifp->if_mtu = ifs->if_mtu; 1111 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1112 if_printf(sc->sc_ifp, "invalid MTU: %lu(%s) != %lu\n", 1113 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu); 1114 return (EINVAL); 1115 } 1116 1117 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1118 if (bif == NULL) 1119 return (ENOMEM); 1120 1121 bif->bif_ifp = ifs; 1122 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1123 bif->bif_savedcaps = ifs->if_capenable; 1124 1125 /* 1126 * Assign the interface's MAC address to the bridge if it's the first 1127 * member and the MAC address of the bridge has not been changed from 1128 * the default randomly generated one. 1129 */ 1130 if (bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) && 1131 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) { 1132 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1133 sc->sc_ifaddr = ifs; 1134 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1135 } 1136 1137 ifs->if_bridge = sc; 1138 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1139 /* 1140 * XXX: XLOCK HERE!?! 1141 * 1142 * NOTE: insert_***HEAD*** should be safe for the traversals. 1143 */ 1144 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1145 1146 /* Set interface capabilities to the intersection set of all members */ 1147 bridge_mutecaps(sc); 1148 bridge_linkcheck(sc); 1149 1150 /* Place the interface into promiscuous mode */ 1151 switch (ifs->if_type) { 1152 case IFT_ETHER: 1153 case IFT_L2VLAN: 1154 BRIDGE_UNLOCK(sc); 1155 error = ifpromisc(ifs, 1); 1156 BRIDGE_LOCK(sc); 1157 break; 1158 } 1159 1160 if (error) 1161 bridge_delete_member(sc, bif, 0); 1162 return (error); 1163 } 1164 1165 static int 1166 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1167 { 1168 struct ifbreq *req = arg; 1169 struct bridge_iflist *bif; 1170 1171 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1172 if (bif == NULL) 1173 return (ENOENT); 1174 1175 bridge_delete_member(sc, bif, 0); 1176 1177 return (0); 1178 } 1179 1180 static int 1181 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1182 { 1183 struct ifbreq *req = arg; 1184 struct bridge_iflist *bif; 1185 struct bstp_port *bp; 1186 1187 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1188 if (bif == NULL) 1189 return (ENOENT); 1190 1191 bp = &bif->bif_stp; 1192 req->ifbr_ifsflags = bif->bif_flags; 1193 req->ifbr_state = bp->bp_state; 1194 req->ifbr_priority = bp->bp_priority; 1195 req->ifbr_path_cost = bp->bp_path_cost; 1196 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1197 req->ifbr_proto = bp->bp_protover; 1198 req->ifbr_role = bp->bp_role; 1199 req->ifbr_stpflags = bp->bp_flags; 1200 req->ifbr_addrcnt = bif->bif_addrcnt; 1201 req->ifbr_addrmax = bif->bif_addrmax; 1202 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1203 1204 /* Copy STP state options as flags */ 1205 if (bp->bp_operedge) 1206 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1207 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1208 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1209 if (bp->bp_ptp_link) 1210 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1211 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1212 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1213 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1214 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1215 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1216 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1217 return (0); 1218 } 1219 1220 static int 1221 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1222 { 1223 struct ifbreq *req = arg; 1224 struct bridge_iflist *bif; 1225 struct bstp_port *bp; 1226 int error; 1227 1228 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1229 if (bif == NULL) 1230 return (ENOENT); 1231 bp = &bif->bif_stp; 1232 1233 if (req->ifbr_ifsflags & IFBIF_SPAN) 1234 /* SPAN is readonly */ 1235 return (EINVAL); 1236 1237 if (req->ifbr_ifsflags & IFBIF_STP) { 1238 if ((bif->bif_flags & IFBIF_STP) == 0) { 1239 error = bstp_enable(&bif->bif_stp); 1240 if (error) 1241 return (error); 1242 } 1243 } else { 1244 if ((bif->bif_flags & IFBIF_STP) != 0) 1245 bstp_disable(&bif->bif_stp); 1246 } 1247 1248 /* Pass on STP flags */ 1249 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1250 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1251 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1252 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1253 1254 /* Save the bits relating to the bridge */ 1255 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1256 1257 return (0); 1258 } 1259 1260 static int 1261 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1262 { 1263 struct ifbrparam *param = arg; 1264 1265 sc->sc_brtmax = param->ifbrp_csize; 1266 bridge_rttrim(sc); 1267 1268 return (0); 1269 } 1270 1271 static int 1272 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1273 { 1274 struct ifbrparam *param = arg; 1275 1276 param->ifbrp_csize = sc->sc_brtmax; 1277 1278 return (0); 1279 } 1280 1281 static int 1282 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1283 { 1284 struct ifbifconf *bifc = arg; 1285 struct bridge_iflist *bif; 1286 struct ifbreq breq; 1287 char *buf, *outbuf; 1288 int count, buflen, len, error = 0; 1289 1290 count = 0; 1291 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1292 count++; 1293 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1294 count++; 1295 1296 buflen = sizeof(breq) * count; 1297 if (bifc->ifbic_len == 0) { 1298 bifc->ifbic_len = buflen; 1299 return (0); 1300 } 1301 BRIDGE_UNLOCK(sc); 1302 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1303 BRIDGE_LOCK(sc); 1304 1305 count = 0; 1306 buf = outbuf; 1307 len = min(bifc->ifbic_len, buflen); 1308 bzero(&breq, sizeof(breq)); 1309 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1310 if (len < sizeof(breq)) 1311 break; 1312 1313 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1314 sizeof(breq.ifbr_ifsname)); 1315 /* Fill in the ifbreq structure */ 1316 error = bridge_ioctl_gifflags(sc, &breq); 1317 if (error) 1318 break; 1319 memcpy(buf, &breq, sizeof(breq)); 1320 count++; 1321 buf += sizeof(breq); 1322 len -= sizeof(breq); 1323 } 1324 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1325 if (len < sizeof(breq)) 1326 break; 1327 1328 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1329 sizeof(breq.ifbr_ifsname)); 1330 breq.ifbr_ifsflags = bif->bif_flags; 1331 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1332 memcpy(buf, &breq, sizeof(breq)); 1333 count++; 1334 buf += sizeof(breq); 1335 len -= sizeof(breq); 1336 } 1337 1338 BRIDGE_UNLOCK(sc); 1339 bifc->ifbic_len = sizeof(breq) * count; 1340 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1341 BRIDGE_LOCK(sc); 1342 free(outbuf, M_TEMP); 1343 return (error); 1344 } 1345 1346 static int 1347 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1348 { 1349 struct ifbaconf *bac = arg; 1350 struct bridge_rtnode *brt; 1351 struct ifbareq bareq; 1352 char *buf, *outbuf; 1353 int count, buflen, len, error = 0; 1354 1355 if (bac->ifbac_len == 0) 1356 return (0); 1357 1358 count = 0; 1359 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1360 count++; 1361 buflen = sizeof(bareq) * count; 1362 1363 BRIDGE_UNLOCK(sc); 1364 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1365 BRIDGE_LOCK(sc); 1366 1367 count = 0; 1368 buf = outbuf; 1369 len = min(bac->ifbac_len, buflen); 1370 bzero(&bareq, sizeof(bareq)); 1371 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1372 if (len < sizeof(bareq)) 1373 goto out; 1374 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1375 sizeof(bareq.ifba_ifsname)); 1376 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1377 bareq.ifba_vlan = brt->brt_vlan; 1378 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1379 time_uptime < brt->brt_expire) 1380 bareq.ifba_expire = brt->brt_expire - time_uptime; 1381 else 1382 bareq.ifba_expire = 0; 1383 bareq.ifba_flags = brt->brt_flags; 1384 1385 memcpy(buf, &bareq, sizeof(bareq)); 1386 count++; 1387 buf += sizeof(bareq); 1388 len -= sizeof(bareq); 1389 } 1390 out: 1391 BRIDGE_UNLOCK(sc); 1392 bac->ifbac_len = sizeof(bareq) * count; 1393 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1394 BRIDGE_LOCK(sc); 1395 free(outbuf, M_TEMP); 1396 return (error); 1397 } 1398 1399 static int 1400 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1401 { 1402 struct ifbareq *req = arg; 1403 struct bridge_iflist *bif; 1404 int error; 1405 1406 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1407 if (bif == NULL) 1408 return (ENOENT); 1409 1410 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1411 req->ifba_flags); 1412 1413 return (error); 1414 } 1415 1416 static int 1417 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1418 { 1419 struct ifbrparam *param = arg; 1420 1421 sc->sc_brttimeout = param->ifbrp_ctime; 1422 return (0); 1423 } 1424 1425 static int 1426 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1427 { 1428 struct ifbrparam *param = arg; 1429 1430 param->ifbrp_ctime = sc->sc_brttimeout; 1431 return (0); 1432 } 1433 1434 static int 1435 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1436 { 1437 struct ifbareq *req = arg; 1438 1439 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1440 } 1441 1442 static int 1443 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1444 { 1445 struct ifbreq *req = arg; 1446 1447 bridge_rtflush(sc, req->ifbr_ifsflags); 1448 return (0); 1449 } 1450 1451 static int 1452 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1453 { 1454 struct ifbrparam *param = arg; 1455 struct bstp_state *bs = &sc->sc_stp; 1456 1457 param->ifbrp_prio = bs->bs_bridge_priority; 1458 return (0); 1459 } 1460 1461 static int 1462 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1463 { 1464 struct ifbrparam *param = arg; 1465 1466 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1467 } 1468 1469 static int 1470 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1471 { 1472 struct ifbrparam *param = arg; 1473 struct bstp_state *bs = &sc->sc_stp; 1474 1475 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1476 return (0); 1477 } 1478 1479 static int 1480 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1481 { 1482 struct ifbrparam *param = arg; 1483 1484 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1485 } 1486 1487 static int 1488 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1489 { 1490 struct ifbrparam *param = arg; 1491 struct bstp_state *bs = &sc->sc_stp; 1492 1493 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1494 return (0); 1495 } 1496 1497 static int 1498 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1499 { 1500 struct ifbrparam *param = arg; 1501 1502 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1503 } 1504 1505 static int 1506 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1507 { 1508 struct ifbrparam *param = arg; 1509 struct bstp_state *bs = &sc->sc_stp; 1510 1511 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1512 return (0); 1513 } 1514 1515 static int 1516 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1517 { 1518 struct ifbrparam *param = arg; 1519 1520 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1521 } 1522 1523 static int 1524 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1525 { 1526 struct ifbreq *req = arg; 1527 struct bridge_iflist *bif; 1528 1529 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1530 if (bif == NULL) 1531 return (ENOENT); 1532 1533 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1534 } 1535 1536 static int 1537 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1538 { 1539 struct ifbreq *req = arg; 1540 struct bridge_iflist *bif; 1541 1542 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1543 if (bif == NULL) 1544 return (ENOENT); 1545 1546 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1547 } 1548 1549 static int 1550 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1551 { 1552 struct ifbreq *req = arg; 1553 struct bridge_iflist *bif; 1554 1555 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1556 if (bif == NULL) 1557 return (ENOENT); 1558 1559 bif->bif_addrmax = req->ifbr_addrmax; 1560 return (0); 1561 } 1562 1563 static int 1564 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1565 { 1566 struct ifbreq *req = arg; 1567 struct bridge_iflist *bif = NULL; 1568 struct ifnet *ifs; 1569 1570 ifs = ifunit(req->ifbr_ifsname); 1571 if (ifs == NULL) 1572 return (ENOENT); 1573 1574 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1575 if (ifs == bif->bif_ifp) 1576 return (EBUSY); 1577 1578 if (ifs->if_bridge != NULL) 1579 return (EBUSY); 1580 1581 switch (ifs->if_type) { 1582 case IFT_ETHER: 1583 case IFT_GIF: 1584 case IFT_L2VLAN: 1585 break; 1586 default: 1587 return (EINVAL); 1588 } 1589 1590 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1591 if (bif == NULL) 1592 return (ENOMEM); 1593 1594 bif->bif_ifp = ifs; 1595 bif->bif_flags = IFBIF_SPAN; 1596 1597 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1598 1599 return (0); 1600 } 1601 1602 static int 1603 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1604 { 1605 struct ifbreq *req = arg; 1606 struct bridge_iflist *bif; 1607 struct ifnet *ifs; 1608 1609 ifs = ifunit(req->ifbr_ifsname); 1610 if (ifs == NULL) 1611 return (ENOENT); 1612 1613 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1614 if (ifs == bif->bif_ifp) 1615 break; 1616 1617 if (bif == NULL) 1618 return (ENOENT); 1619 1620 bridge_delete_span(sc, bif); 1621 1622 return (0); 1623 } 1624 1625 static int 1626 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1627 { 1628 struct ifbropreq *req = arg; 1629 struct bstp_state *bs = &sc->sc_stp; 1630 struct bstp_port *root_port; 1631 1632 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1633 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1634 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1635 1636 root_port = bs->bs_root_port; 1637 if (root_port == NULL) 1638 req->ifbop_root_port = 0; 1639 else 1640 req->ifbop_root_port = root_port->bp_ifp->if_index; 1641 1642 req->ifbop_holdcount = bs->bs_txholdcount; 1643 req->ifbop_priority = bs->bs_bridge_priority; 1644 req->ifbop_protocol = bs->bs_protover; 1645 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1646 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1647 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1648 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1649 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1650 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1651 1652 return (0); 1653 } 1654 1655 static int 1656 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1657 { 1658 struct ifbrparam *param = arg; 1659 1660 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1661 return (0); 1662 } 1663 1664 static int 1665 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1666 { 1667 struct ifbpstpconf *bifstp = arg; 1668 struct bridge_iflist *bif; 1669 struct bstp_port *bp; 1670 struct ifbpstpreq bpreq; 1671 char *buf, *outbuf; 1672 int count, buflen, len, error = 0; 1673 1674 count = 0; 1675 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1676 if ((bif->bif_flags & IFBIF_STP) != 0) 1677 count++; 1678 } 1679 1680 buflen = sizeof(bpreq) * count; 1681 if (bifstp->ifbpstp_len == 0) { 1682 bifstp->ifbpstp_len = buflen; 1683 return (0); 1684 } 1685 1686 BRIDGE_UNLOCK(sc); 1687 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1688 BRIDGE_LOCK(sc); 1689 1690 count = 0; 1691 buf = outbuf; 1692 len = min(bifstp->ifbpstp_len, buflen); 1693 bzero(&bpreq, sizeof(bpreq)); 1694 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1695 if (len < sizeof(bpreq)) 1696 break; 1697 1698 if ((bif->bif_flags & IFBIF_STP) == 0) 1699 continue; 1700 1701 bp = &bif->bif_stp; 1702 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1703 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1704 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1705 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1706 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1707 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1708 1709 memcpy(buf, &bpreq, sizeof(bpreq)); 1710 count++; 1711 buf += sizeof(bpreq); 1712 len -= sizeof(bpreq); 1713 } 1714 1715 BRIDGE_UNLOCK(sc); 1716 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1717 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1718 BRIDGE_LOCK(sc); 1719 free(outbuf, M_TEMP); 1720 return (error); 1721 } 1722 1723 static int 1724 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1725 { 1726 struct ifbrparam *param = arg; 1727 1728 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1729 } 1730 1731 static int 1732 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1733 { 1734 struct ifbrparam *param = arg; 1735 1736 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1737 } 1738 1739 /* 1740 * bridge_ifdetach: 1741 * 1742 * Detach an interface from a bridge. Called when a member 1743 * interface is detaching. 1744 */ 1745 static void 1746 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1747 { 1748 struct bridge_softc *sc = ifp->if_bridge; 1749 struct bridge_iflist *bif; 1750 1751 if (ifp->if_flags & IFF_RENAMING) 1752 return; 1753 1754 /* Check if the interface is a bridge member */ 1755 if (sc != NULL) { 1756 BRIDGE_LOCK(sc); 1757 1758 bif = bridge_lookup_member_if(sc, ifp); 1759 if (bif != NULL) 1760 bridge_delete_member(sc, bif, 1); 1761 1762 BRIDGE_UNLOCK(sc); 1763 return; 1764 } 1765 1766 /* Check if the interface is a span port */ 1767 mtx_lock(&bridge_list_mtx); 1768 LIST_FOREACH(sc, &bridge_list, sc_list) { 1769 BRIDGE_LOCK(sc); 1770 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1771 if (ifp == bif->bif_ifp) { 1772 bridge_delete_span(sc, bif); 1773 break; 1774 } 1775 1776 BRIDGE_UNLOCK(sc); 1777 } 1778 mtx_unlock(&bridge_list_mtx); 1779 } 1780 1781 /* 1782 * bridge_init: 1783 * 1784 * Initialize a bridge interface. 1785 */ 1786 static void 1787 bridge_init(void *xsc) 1788 { 1789 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1790 struct ifnet *ifp = sc->sc_ifp; 1791 1792 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1793 return; 1794 1795 BRIDGE_LOCK(sc); 1796 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1797 bridge_timer, sc); 1798 1799 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1800 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1801 1802 BRIDGE_UNLOCK(sc); 1803 } 1804 1805 /* 1806 * bridge_stop: 1807 * 1808 * Stop the bridge interface. 1809 */ 1810 static void 1811 bridge_stop(struct ifnet *ifp, int disable) 1812 { 1813 struct bridge_softc *sc = ifp->if_softc; 1814 1815 BRIDGE_LOCK_ASSERT(sc); 1816 1817 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1818 return; 1819 1820 callout_stop(&sc->sc_brcallout); 1821 bstp_stop(&sc->sc_stp); 1822 1823 bridge_rtflush(sc, IFBF_FLUSHDYN); 1824 1825 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1826 } 1827 1828 /* 1829 * bridge_enqueue: 1830 * 1831 * Enqueue a packet on a bridge member interface. 1832 * 1833 */ 1834 static int 1835 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1836 { 1837 int len, err = 0; 1838 short mflags; 1839 struct mbuf *m0; 1840 1841 /* We may be sending a fragment so traverse the mbuf */ 1842 for (; m; m = m0) { 1843 m0 = m->m_nextpkt; 1844 m->m_nextpkt = NULL; 1845 len = m->m_pkthdr.len; 1846 mflags = m->m_flags; 1847 1848 /* 1849 * If underlying interface can not do VLAN tag insertion itself 1850 * then attach a packet tag that holds it. 1851 */ 1852 if ((m->m_flags & M_VLANTAG) && 1853 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1854 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1855 if (m == NULL) { 1856 if_printf(dst_ifp, 1857 "unable to prepend VLAN header\n"); 1858 dst_ifp->if_oerrors++; 1859 continue; 1860 } 1861 m->m_flags &= ~M_VLANTAG; 1862 } 1863 1864 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 1865 m_freem(m0); 1866 sc->sc_ifp->if_oerrors++; 1867 break; 1868 } 1869 1870 sc->sc_ifp->if_opackets++; 1871 sc->sc_ifp->if_obytes += len; 1872 if (mflags & M_MCAST) 1873 sc->sc_ifp->if_omcasts++; 1874 } 1875 1876 return (err); 1877 } 1878 1879 /* 1880 * bridge_dummynet: 1881 * 1882 * Receive a queued packet from dummynet and pass it on to the output 1883 * interface. 1884 * 1885 * The mbuf has the Ethernet header already attached. 1886 */ 1887 static void 1888 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1889 { 1890 struct bridge_softc *sc; 1891 1892 sc = ifp->if_bridge; 1893 1894 /* 1895 * The packet didnt originate from a member interface. This should only 1896 * ever happen if a member interface is removed while packets are 1897 * queued for it. 1898 */ 1899 if (sc == NULL) { 1900 m_freem(m); 1901 return; 1902 } 1903 1904 if (PFIL_HOOKED(&V_inet_pfil_hook) 1905 #ifdef INET6 1906 || PFIL_HOOKED(&V_inet6_pfil_hook) 1907 #endif 1908 ) { 1909 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1910 return; 1911 if (m == NULL) 1912 return; 1913 } 1914 1915 bridge_enqueue(sc, ifp, m); 1916 } 1917 1918 /* 1919 * bridge_output: 1920 * 1921 * Send output from a bridge member interface. This 1922 * performs the bridging function for locally originated 1923 * packets. 1924 * 1925 * The mbuf has the Ethernet header already attached. We must 1926 * enqueue or free the mbuf before returning. 1927 */ 1928 static int 1929 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1930 struct rtentry *rt) 1931 { 1932 struct ether_header *eh; 1933 struct ifnet *dst_if; 1934 struct bridge_softc *sc; 1935 uint16_t vlan; 1936 1937 if (m->m_len < ETHER_HDR_LEN) { 1938 m = m_pullup(m, ETHER_HDR_LEN); 1939 if (m == NULL) 1940 return (0); 1941 } 1942 1943 eh = mtod(m, struct ether_header *); 1944 sc = ifp->if_bridge; 1945 vlan = VLANTAGOF(m); 1946 1947 BRIDGE_LOCK(sc); 1948 1949 /* 1950 * If bridge is down, but the original output interface is up, 1951 * go ahead and send out that interface. Otherwise, the packet 1952 * is dropped below. 1953 */ 1954 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1955 dst_if = ifp; 1956 goto sendunicast; 1957 } 1958 1959 /* 1960 * If the packet is a multicast, or we don't know a better way to 1961 * get there, send to all interfaces. 1962 */ 1963 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 1964 dst_if = NULL; 1965 else 1966 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 1967 if (dst_if == NULL) { 1968 struct bridge_iflist *bif; 1969 struct mbuf *mc; 1970 int error = 0, used = 0; 1971 1972 bridge_span(sc, m); 1973 1974 BRIDGE_LOCK2REF(sc, error); 1975 if (error) { 1976 m_freem(m); 1977 return (0); 1978 } 1979 1980 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1981 dst_if = bif->bif_ifp; 1982 1983 if (dst_if->if_type == IFT_GIF) 1984 continue; 1985 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 1986 continue; 1987 1988 /* 1989 * If this is not the original output interface, 1990 * and the interface is participating in spanning 1991 * tree, make sure the port is in a state that 1992 * allows forwarding. 1993 */ 1994 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 1995 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 1996 continue; 1997 1998 if (LIST_NEXT(bif, bif_next) == NULL) { 1999 used = 1; 2000 mc = m; 2001 } else { 2002 mc = m_copypacket(m, M_NOWAIT); 2003 if (mc == NULL) { 2004 sc->sc_ifp->if_oerrors++; 2005 continue; 2006 } 2007 } 2008 2009 bridge_enqueue(sc, dst_if, mc); 2010 } 2011 if (used == 0) 2012 m_freem(m); 2013 BRIDGE_UNREF(sc); 2014 return (0); 2015 } 2016 2017 sendunicast: 2018 /* 2019 * XXX Spanning tree consideration here? 2020 */ 2021 2022 bridge_span(sc, m); 2023 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2024 m_freem(m); 2025 BRIDGE_UNLOCK(sc); 2026 return (0); 2027 } 2028 2029 BRIDGE_UNLOCK(sc); 2030 bridge_enqueue(sc, dst_if, m); 2031 return (0); 2032 } 2033 2034 /* 2035 * bridge_transmit: 2036 * 2037 * Do output on a bridge. 2038 * 2039 */ 2040 static int 2041 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2042 { 2043 struct bridge_softc *sc; 2044 struct ether_header *eh; 2045 struct ifnet *dst_if; 2046 int error = 0; 2047 2048 sc = ifp->if_softc; 2049 2050 ETHER_BPF_MTAP(ifp, m); 2051 2052 eh = mtod(m, struct ether_header *); 2053 2054 BRIDGE_LOCK(sc); 2055 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2056 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) { 2057 BRIDGE_UNLOCK(sc); 2058 error = bridge_enqueue(sc, dst_if, m); 2059 } else 2060 bridge_broadcast(sc, ifp, m, 0); 2061 2062 return (error); 2063 } 2064 2065 /* 2066 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2067 */ 2068 static void 2069 bridge_qflush(struct ifnet *ifp __unused) 2070 { 2071 } 2072 2073 /* 2074 * bridge_forward: 2075 * 2076 * The forwarding function of the bridge. 2077 * 2078 * NOTE: Releases the lock on return. 2079 */ 2080 static void 2081 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2082 struct mbuf *m) 2083 { 2084 struct bridge_iflist *dbif; 2085 struct ifnet *src_if, *dst_if, *ifp; 2086 struct ether_header *eh; 2087 uint16_t vlan; 2088 uint8_t *dst; 2089 int error; 2090 2091 src_if = m->m_pkthdr.rcvif; 2092 ifp = sc->sc_ifp; 2093 2094 ifp->if_ipackets++; 2095 ifp->if_ibytes += m->m_pkthdr.len; 2096 vlan = VLANTAGOF(m); 2097 2098 if ((sbif->bif_flags & IFBIF_STP) && 2099 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2100 goto drop; 2101 2102 eh = mtod(m, struct ether_header *); 2103 dst = eh->ether_dhost; 2104 2105 /* If the interface is learning, record the address. */ 2106 if (sbif->bif_flags & IFBIF_LEARNING) { 2107 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2108 sbif, 0, IFBAF_DYNAMIC); 2109 /* 2110 * If the interface has addresses limits then deny any source 2111 * that is not in the cache. 2112 */ 2113 if (error && sbif->bif_addrmax) 2114 goto drop; 2115 } 2116 2117 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2118 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2119 goto drop; 2120 2121 /* 2122 * At this point, the port either doesn't participate 2123 * in spanning tree or it is in the forwarding state. 2124 */ 2125 2126 /* 2127 * If the packet is unicast, destined for someone on 2128 * "this" side of the bridge, drop it. 2129 */ 2130 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2131 dst_if = bridge_rtlookup(sc, dst, vlan); 2132 if (src_if == dst_if) 2133 goto drop; 2134 } else { 2135 /* 2136 * Check if its a reserved multicast address, any address 2137 * listed in 802.1D section 7.12.6 may not be forwarded by the 2138 * bridge. 2139 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2140 */ 2141 if (dst[0] == 0x01 && dst[1] == 0x80 && 2142 dst[2] == 0xc2 && dst[3] == 0x00 && 2143 dst[4] == 0x00 && dst[5] <= 0x0f) 2144 goto drop; 2145 2146 /* ...forward it to all interfaces. */ 2147 ifp->if_imcasts++; 2148 dst_if = NULL; 2149 } 2150 2151 /* 2152 * If we have a destination interface which is a member of our bridge, 2153 * OR this is a unicast packet, push it through the bpf(4) machinery. 2154 * For broadcast or multicast packets, don't bother because it will 2155 * be reinjected into ether_input. We do this before we pass the packets 2156 * through the pfil(9) framework, as it is possible that pfil(9) will 2157 * drop the packet, or possibly modify it, making it difficult to debug 2158 * firewall issues on the bridge. 2159 */ 2160 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2161 ETHER_BPF_MTAP(ifp, m); 2162 2163 /* run the packet filter */ 2164 if (PFIL_HOOKED(&V_inet_pfil_hook) 2165 #ifdef INET6 2166 || PFIL_HOOKED(&V_inet6_pfil_hook) 2167 #endif 2168 ) { 2169 BRIDGE_UNLOCK(sc); 2170 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2171 return; 2172 if (m == NULL) 2173 return; 2174 BRIDGE_LOCK(sc); 2175 } 2176 2177 if (dst_if == NULL) { 2178 bridge_broadcast(sc, src_if, m, 1); 2179 return; 2180 } 2181 2182 /* 2183 * At this point, we're dealing with a unicast frame 2184 * going to a different interface. 2185 */ 2186 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2187 goto drop; 2188 2189 dbif = bridge_lookup_member_if(sc, dst_if); 2190 if (dbif == NULL) 2191 /* Not a member of the bridge (anymore?) */ 2192 goto drop; 2193 2194 /* Private segments can not talk to each other */ 2195 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2196 goto drop; 2197 2198 if ((dbif->bif_flags & IFBIF_STP) && 2199 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2200 goto drop; 2201 2202 BRIDGE_UNLOCK(sc); 2203 2204 if (PFIL_HOOKED(&V_inet_pfil_hook) 2205 #ifdef INET6 2206 || PFIL_HOOKED(&V_inet6_pfil_hook) 2207 #endif 2208 ) { 2209 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2210 return; 2211 if (m == NULL) 2212 return; 2213 } 2214 2215 bridge_enqueue(sc, dst_if, m); 2216 return; 2217 2218 drop: 2219 BRIDGE_UNLOCK(sc); 2220 m_freem(m); 2221 } 2222 2223 /* 2224 * bridge_input: 2225 * 2226 * Receive input from a member interface. Queue the packet for 2227 * bridging if it is not for us. 2228 */ 2229 static struct mbuf * 2230 bridge_input(struct ifnet *ifp, struct mbuf *m) 2231 { 2232 struct bridge_softc *sc = ifp->if_bridge; 2233 struct bridge_iflist *bif, *bif2; 2234 struct ifnet *bifp; 2235 struct ether_header *eh; 2236 struct mbuf *mc, *mc2; 2237 uint16_t vlan; 2238 int error; 2239 2240 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2241 return (m); 2242 2243 bifp = sc->sc_ifp; 2244 vlan = VLANTAGOF(m); 2245 2246 /* 2247 * Implement support for bridge monitoring. If this flag has been 2248 * set on this interface, discard the packet once we push it through 2249 * the bpf(4) machinery, but before we do, increment the byte and 2250 * packet counters associated with this interface. 2251 */ 2252 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2253 m->m_pkthdr.rcvif = bifp; 2254 ETHER_BPF_MTAP(bifp, m); 2255 bifp->if_ipackets++; 2256 bifp->if_ibytes += m->m_pkthdr.len; 2257 m_freem(m); 2258 return (NULL); 2259 } 2260 BRIDGE_LOCK(sc); 2261 bif = bridge_lookup_member_if(sc, ifp); 2262 if (bif == NULL) { 2263 BRIDGE_UNLOCK(sc); 2264 return (m); 2265 } 2266 2267 eh = mtod(m, struct ether_header *); 2268 2269 bridge_span(sc, m); 2270 2271 if (m->m_flags & (M_BCAST|M_MCAST)) { 2272 /* Tap off 802.1D packets; they do not get forwarded. */ 2273 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2274 ETHER_ADDR_LEN) == 0) { 2275 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2276 BRIDGE_UNLOCK(sc); 2277 return (NULL); 2278 } 2279 2280 if ((bif->bif_flags & IFBIF_STP) && 2281 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2282 BRIDGE_UNLOCK(sc); 2283 return (m); 2284 } 2285 2286 /* 2287 * Make a deep copy of the packet and enqueue the copy 2288 * for bridge processing; return the original packet for 2289 * local processing. 2290 */ 2291 mc = m_dup(m, M_NOWAIT); 2292 if (mc == NULL) { 2293 BRIDGE_UNLOCK(sc); 2294 return (m); 2295 } 2296 2297 /* Perform the bridge forwarding function with the copy. */ 2298 bridge_forward(sc, bif, mc); 2299 2300 /* 2301 * Reinject the mbuf as arriving on the bridge so we have a 2302 * chance at claiming multicast packets. We can not loop back 2303 * here from ether_input as a bridge is never a member of a 2304 * bridge. 2305 */ 2306 KASSERT(bifp->if_bridge == NULL, 2307 ("loop created in bridge_input")); 2308 mc2 = m_dup(m, M_NOWAIT); 2309 if (mc2 != NULL) { 2310 /* Keep the layer3 header aligned */ 2311 int i = min(mc2->m_pkthdr.len, max_protohdr); 2312 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2313 } 2314 if (mc2 != NULL) { 2315 mc2->m_pkthdr.rcvif = bifp; 2316 (*bifp->if_input)(bifp, mc2); 2317 } 2318 2319 /* Return the original packet for local processing. */ 2320 return (m); 2321 } 2322 2323 if ((bif->bif_flags & IFBIF_STP) && 2324 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2325 BRIDGE_UNLOCK(sc); 2326 return (m); 2327 } 2328 2329 #if (defined(INET) || defined(INET6)) 2330 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2331 || ((iface)->if_carp \ 2332 && (*carp_forus_p)((iface), eh->ether_dhost)) 2333 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2334 || ((iface)->if_carp \ 2335 && (*carp_forus_p)((iface), eh->ether_shost)) 2336 #else 2337 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2338 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2339 #endif 2340 2341 #ifdef INET6 2342 # define OR_PFIL_HOOKED_INET6 \ 2343 || PFIL_HOOKED(&V_inet6_pfil_hook) 2344 #else 2345 # define OR_PFIL_HOOKED_INET6 2346 #endif 2347 2348 #define GRAB_OUR_PACKETS(iface) \ 2349 if ((iface)->if_type == IFT_GIF) \ 2350 continue; \ 2351 /* It is destined for us. */ \ 2352 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2353 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2354 ) { \ 2355 if ((iface)->if_type == IFT_BRIDGE) { \ 2356 ETHER_BPF_MTAP(iface, m); \ 2357 iface->if_ipackets++; \ 2358 iface->if_ibytes += m->m_pkthdr.len; \ 2359 /* Filter on the physical interface. */ \ 2360 if (pfil_local_phys && \ 2361 (PFIL_HOOKED(&V_inet_pfil_hook) \ 2362 OR_PFIL_HOOKED_INET6)) { \ 2363 if (bridge_pfil(&m, NULL, ifp, \ 2364 PFIL_IN) != 0 || m == NULL) { \ 2365 BRIDGE_UNLOCK(sc); \ 2366 return (NULL); \ 2367 } \ 2368 eh = mtod(m, struct ether_header *); \ 2369 } \ 2370 } \ 2371 if (bif->bif_flags & IFBIF_LEARNING) { \ 2372 error = bridge_rtupdate(sc, eh->ether_shost, \ 2373 vlan, bif, 0, IFBAF_DYNAMIC); \ 2374 if (error && bif->bif_addrmax) { \ 2375 BRIDGE_UNLOCK(sc); \ 2376 m_freem(m); \ 2377 return (NULL); \ 2378 } \ 2379 } \ 2380 m->m_pkthdr.rcvif = iface; \ 2381 BRIDGE_UNLOCK(sc); \ 2382 return (m); \ 2383 } \ 2384 \ 2385 /* We just received a packet that we sent out. */ \ 2386 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2387 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2388 ) { \ 2389 BRIDGE_UNLOCK(sc); \ 2390 m_freem(m); \ 2391 return (NULL); \ 2392 } 2393 2394 /* 2395 * Unicast. Make sure it's not for the bridge. 2396 */ 2397 do { GRAB_OUR_PACKETS(bifp) } while (0); 2398 2399 /* 2400 * Give a chance for ifp at first priority. This will help when the 2401 * packet comes through the interface like VLAN's with the same MACs 2402 * on several interfaces from the same bridge. This also will save 2403 * some CPU cycles in case the destination interface and the input 2404 * interface (eq ifp) are the same. 2405 */ 2406 do { GRAB_OUR_PACKETS(ifp) } while (0); 2407 2408 /* Now check the all bridge members. */ 2409 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2410 GRAB_OUR_PACKETS(bif2->bif_ifp) 2411 } 2412 2413 #undef OR_CARP_CHECK_WE_ARE_DST 2414 #undef OR_CARP_CHECK_WE_ARE_SRC 2415 #undef OR_PFIL_HOOKED_INET6 2416 #undef GRAB_OUR_PACKETS 2417 2418 /* Perform the bridge forwarding function. */ 2419 bridge_forward(sc, bif, m); 2420 2421 return (NULL); 2422 } 2423 2424 /* 2425 * bridge_broadcast: 2426 * 2427 * Send a frame to all interfaces that are members of 2428 * the bridge, except for the one on which the packet 2429 * arrived. 2430 * 2431 * NOTE: Releases the lock on return. 2432 */ 2433 static void 2434 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2435 struct mbuf *m, int runfilt) 2436 { 2437 struct bridge_iflist *dbif, *sbif; 2438 struct mbuf *mc; 2439 struct ifnet *dst_if; 2440 int error = 0, used = 0, i; 2441 2442 sbif = bridge_lookup_member_if(sc, src_if); 2443 2444 BRIDGE_LOCK2REF(sc, error); 2445 if (error) { 2446 m_freem(m); 2447 return; 2448 } 2449 2450 /* Filter on the bridge interface before broadcasting */ 2451 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2452 #ifdef INET6 2453 || PFIL_HOOKED(&V_inet6_pfil_hook) 2454 #endif 2455 )) { 2456 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2457 goto out; 2458 if (m == NULL) 2459 goto out; 2460 } 2461 2462 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2463 dst_if = dbif->bif_ifp; 2464 if (dst_if == src_if) 2465 continue; 2466 2467 /* Private segments can not talk to each other */ 2468 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2469 continue; 2470 2471 if ((dbif->bif_flags & IFBIF_STP) && 2472 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2473 continue; 2474 2475 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2476 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2477 continue; 2478 2479 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2480 continue; 2481 2482 if (LIST_NEXT(dbif, bif_next) == NULL) { 2483 mc = m; 2484 used = 1; 2485 } else { 2486 mc = m_dup(m, M_NOWAIT); 2487 if (mc == NULL) { 2488 sc->sc_ifp->if_oerrors++; 2489 continue; 2490 } 2491 } 2492 2493 /* 2494 * Filter on the output interface. Pass a NULL bridge interface 2495 * pointer so we do not redundantly filter on the bridge for 2496 * each interface we broadcast on. 2497 */ 2498 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2499 #ifdef INET6 2500 || PFIL_HOOKED(&V_inet6_pfil_hook) 2501 #endif 2502 )) { 2503 if (used == 0) { 2504 /* Keep the layer3 header aligned */ 2505 i = min(mc->m_pkthdr.len, max_protohdr); 2506 mc = m_copyup(mc, i, ETHER_ALIGN); 2507 if (mc == NULL) { 2508 sc->sc_ifp->if_oerrors++; 2509 continue; 2510 } 2511 } 2512 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2513 continue; 2514 if (mc == NULL) 2515 continue; 2516 } 2517 2518 bridge_enqueue(sc, dst_if, mc); 2519 } 2520 if (used == 0) 2521 m_freem(m); 2522 2523 out: 2524 BRIDGE_UNREF(sc); 2525 } 2526 2527 /* 2528 * bridge_span: 2529 * 2530 * Duplicate a packet out one or more interfaces that are in span mode, 2531 * the original mbuf is unmodified. 2532 */ 2533 static void 2534 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2535 { 2536 struct bridge_iflist *bif; 2537 struct ifnet *dst_if; 2538 struct mbuf *mc; 2539 2540 if (LIST_EMPTY(&sc->sc_spanlist)) 2541 return; 2542 2543 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2544 dst_if = bif->bif_ifp; 2545 2546 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2547 continue; 2548 2549 mc = m_copypacket(m, M_NOWAIT); 2550 if (mc == NULL) { 2551 sc->sc_ifp->if_oerrors++; 2552 continue; 2553 } 2554 2555 bridge_enqueue(sc, dst_if, mc); 2556 } 2557 } 2558 2559 /* 2560 * bridge_rtupdate: 2561 * 2562 * Add a bridge routing entry. 2563 */ 2564 static int 2565 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2566 struct bridge_iflist *bif, int setflags, uint8_t flags) 2567 { 2568 struct bridge_rtnode *brt; 2569 int error; 2570 2571 BRIDGE_LOCK_ASSERT(sc); 2572 2573 /* Check the source address is valid and not multicast. */ 2574 if (ETHER_IS_MULTICAST(dst) || 2575 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2576 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2577 return (EINVAL); 2578 2579 /* 802.1p frames map to vlan 1 */ 2580 if (vlan == 0) 2581 vlan = 1; 2582 2583 /* 2584 * A route for this destination might already exist. If so, 2585 * update it, otherwise create a new one. 2586 */ 2587 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2588 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2589 sc->sc_brtexceeded++; 2590 return (ENOSPC); 2591 } 2592 /* Check per interface address limits (if enabled) */ 2593 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2594 bif->bif_addrexceeded++; 2595 return (ENOSPC); 2596 } 2597 2598 /* 2599 * Allocate a new bridge forwarding node, and 2600 * initialize the expiration time and Ethernet 2601 * address. 2602 */ 2603 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2604 if (brt == NULL) 2605 return (ENOMEM); 2606 2607 if (bif->bif_flags & IFBIF_STICKY) 2608 brt->brt_flags = IFBAF_STICKY; 2609 else 2610 brt->brt_flags = IFBAF_DYNAMIC; 2611 2612 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2613 brt->brt_vlan = vlan; 2614 2615 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2616 uma_zfree(bridge_rtnode_zone, brt); 2617 return (error); 2618 } 2619 brt->brt_dst = bif; 2620 bif->bif_addrcnt++; 2621 } 2622 2623 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2624 brt->brt_dst != bif) { 2625 brt->brt_dst->bif_addrcnt--; 2626 brt->brt_dst = bif; 2627 brt->brt_dst->bif_addrcnt++; 2628 } 2629 2630 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2631 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2632 if (setflags) 2633 brt->brt_flags = flags; 2634 2635 return (0); 2636 } 2637 2638 /* 2639 * bridge_rtlookup: 2640 * 2641 * Lookup the destination interface for an address. 2642 */ 2643 static struct ifnet * 2644 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2645 { 2646 struct bridge_rtnode *brt; 2647 2648 BRIDGE_LOCK_ASSERT(sc); 2649 2650 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2651 return (NULL); 2652 2653 return (brt->brt_ifp); 2654 } 2655 2656 /* 2657 * bridge_rttrim: 2658 * 2659 * Trim the routine table so that we have a number 2660 * of routing entries less than or equal to the 2661 * maximum number. 2662 */ 2663 static void 2664 bridge_rttrim(struct bridge_softc *sc) 2665 { 2666 struct bridge_rtnode *brt, *nbrt; 2667 2668 BRIDGE_LOCK_ASSERT(sc); 2669 2670 /* Make sure we actually need to do this. */ 2671 if (sc->sc_brtcnt <= sc->sc_brtmax) 2672 return; 2673 2674 /* Force an aging cycle; this might trim enough addresses. */ 2675 bridge_rtage(sc); 2676 if (sc->sc_brtcnt <= sc->sc_brtmax) 2677 return; 2678 2679 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2680 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2681 bridge_rtnode_destroy(sc, brt); 2682 if (sc->sc_brtcnt <= sc->sc_brtmax) 2683 return; 2684 } 2685 } 2686 } 2687 2688 /* 2689 * bridge_timer: 2690 * 2691 * Aging timer for the bridge. 2692 */ 2693 static void 2694 bridge_timer(void *arg) 2695 { 2696 struct bridge_softc *sc = arg; 2697 2698 BRIDGE_LOCK_ASSERT(sc); 2699 2700 bridge_rtage(sc); 2701 2702 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2703 callout_reset(&sc->sc_brcallout, 2704 bridge_rtable_prune_period * hz, bridge_timer, sc); 2705 } 2706 2707 /* 2708 * bridge_rtage: 2709 * 2710 * Perform an aging cycle. 2711 */ 2712 static void 2713 bridge_rtage(struct bridge_softc *sc) 2714 { 2715 struct bridge_rtnode *brt, *nbrt; 2716 2717 BRIDGE_LOCK_ASSERT(sc); 2718 2719 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2720 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2721 if (time_uptime >= brt->brt_expire) 2722 bridge_rtnode_destroy(sc, brt); 2723 } 2724 } 2725 } 2726 2727 /* 2728 * bridge_rtflush: 2729 * 2730 * Remove all dynamic addresses from the bridge. 2731 */ 2732 static void 2733 bridge_rtflush(struct bridge_softc *sc, int full) 2734 { 2735 struct bridge_rtnode *brt, *nbrt; 2736 2737 BRIDGE_LOCK_ASSERT(sc); 2738 2739 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2740 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2741 bridge_rtnode_destroy(sc, brt); 2742 } 2743 } 2744 2745 /* 2746 * bridge_rtdaddr: 2747 * 2748 * Remove an address from the table. 2749 */ 2750 static int 2751 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2752 { 2753 struct bridge_rtnode *brt; 2754 int found = 0; 2755 2756 BRIDGE_LOCK_ASSERT(sc); 2757 2758 /* 2759 * If vlan is zero then we want to delete for all vlans so the lookup 2760 * may return more than one. 2761 */ 2762 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2763 bridge_rtnode_destroy(sc, brt); 2764 found = 1; 2765 } 2766 2767 return (found ? 0 : ENOENT); 2768 } 2769 2770 /* 2771 * bridge_rtdelete: 2772 * 2773 * Delete routes to a speicifc member interface. 2774 */ 2775 static void 2776 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2777 { 2778 struct bridge_rtnode *brt, *nbrt; 2779 2780 BRIDGE_LOCK_ASSERT(sc); 2781 2782 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2783 if (brt->brt_ifp == ifp && (full || 2784 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2785 bridge_rtnode_destroy(sc, brt); 2786 } 2787 } 2788 2789 /* 2790 * bridge_rtable_init: 2791 * 2792 * Initialize the route table for this bridge. 2793 */ 2794 static void 2795 bridge_rtable_init(struct bridge_softc *sc) 2796 { 2797 int i; 2798 2799 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2800 M_DEVBUF, M_WAITOK); 2801 2802 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2803 LIST_INIT(&sc->sc_rthash[i]); 2804 2805 sc->sc_rthash_key = arc4random(); 2806 LIST_INIT(&sc->sc_rtlist); 2807 } 2808 2809 /* 2810 * bridge_rtable_fini: 2811 * 2812 * Deconstruct the route table for this bridge. 2813 */ 2814 static void 2815 bridge_rtable_fini(struct bridge_softc *sc) 2816 { 2817 2818 KASSERT(sc->sc_brtcnt == 0, 2819 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2820 free(sc->sc_rthash, M_DEVBUF); 2821 } 2822 2823 /* 2824 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2825 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2826 */ 2827 #define mix(a, b, c) \ 2828 do { \ 2829 a -= b; a -= c; a ^= (c >> 13); \ 2830 b -= c; b -= a; b ^= (a << 8); \ 2831 c -= a; c -= b; c ^= (b >> 13); \ 2832 a -= b; a -= c; a ^= (c >> 12); \ 2833 b -= c; b -= a; b ^= (a << 16); \ 2834 c -= a; c -= b; c ^= (b >> 5); \ 2835 a -= b; a -= c; a ^= (c >> 3); \ 2836 b -= c; b -= a; b ^= (a << 10); \ 2837 c -= a; c -= b; c ^= (b >> 15); \ 2838 } while (/*CONSTCOND*/0) 2839 2840 static __inline uint32_t 2841 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2842 { 2843 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2844 2845 b += addr[5] << 8; 2846 b += addr[4]; 2847 a += addr[3] << 24; 2848 a += addr[2] << 16; 2849 a += addr[1] << 8; 2850 a += addr[0]; 2851 2852 mix(a, b, c); 2853 2854 return (c & BRIDGE_RTHASH_MASK); 2855 } 2856 2857 #undef mix 2858 2859 static int 2860 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2861 { 2862 int i, d; 2863 2864 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2865 d = ((int)a[i]) - ((int)b[i]); 2866 } 2867 2868 return (d); 2869 } 2870 2871 /* 2872 * bridge_rtnode_lookup: 2873 * 2874 * Look up a bridge route node for the specified destination. Compare the 2875 * vlan id or if zero then just return the first match. 2876 */ 2877 static struct bridge_rtnode * 2878 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2879 { 2880 struct bridge_rtnode *brt; 2881 uint32_t hash; 2882 int dir; 2883 2884 BRIDGE_LOCK_ASSERT(sc); 2885 2886 hash = bridge_rthash(sc, addr); 2887 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2888 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2889 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2890 return (brt); 2891 if (dir > 0) 2892 return (NULL); 2893 } 2894 2895 return (NULL); 2896 } 2897 2898 /* 2899 * bridge_rtnode_insert: 2900 * 2901 * Insert the specified bridge node into the route table. We 2902 * assume the entry is not already in the table. 2903 */ 2904 static int 2905 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2906 { 2907 struct bridge_rtnode *lbrt; 2908 uint32_t hash; 2909 int dir; 2910 2911 BRIDGE_LOCK_ASSERT(sc); 2912 2913 hash = bridge_rthash(sc, brt->brt_addr); 2914 2915 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2916 if (lbrt == NULL) { 2917 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2918 goto out; 2919 } 2920 2921 do { 2922 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2923 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2924 return (EEXIST); 2925 if (dir > 0) { 2926 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2927 goto out; 2928 } 2929 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2930 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2931 goto out; 2932 } 2933 lbrt = LIST_NEXT(lbrt, brt_hash); 2934 } while (lbrt != NULL); 2935 2936 #ifdef DIAGNOSTIC 2937 panic("bridge_rtnode_insert: impossible"); 2938 #endif 2939 2940 out: 2941 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2942 sc->sc_brtcnt++; 2943 2944 return (0); 2945 } 2946 2947 /* 2948 * bridge_rtnode_destroy: 2949 * 2950 * Destroy a bridge rtnode. 2951 */ 2952 static void 2953 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 2954 { 2955 BRIDGE_LOCK_ASSERT(sc); 2956 2957 LIST_REMOVE(brt, brt_hash); 2958 2959 LIST_REMOVE(brt, brt_list); 2960 sc->sc_brtcnt--; 2961 brt->brt_dst->bif_addrcnt--; 2962 uma_zfree(bridge_rtnode_zone, brt); 2963 } 2964 2965 /* 2966 * bridge_rtable_expire: 2967 * 2968 * Set the expiry time for all routes on an interface. 2969 */ 2970 static void 2971 bridge_rtable_expire(struct ifnet *ifp, int age) 2972 { 2973 struct bridge_softc *sc = ifp->if_bridge; 2974 struct bridge_rtnode *brt; 2975 2976 BRIDGE_LOCK(sc); 2977 2978 /* 2979 * If the age is zero then flush, otherwise set all the expiry times to 2980 * age for the interface 2981 */ 2982 if (age == 0) 2983 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 2984 else { 2985 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 2986 /* Cap the expiry time to 'age' */ 2987 if (brt->brt_ifp == ifp && 2988 brt->brt_expire > time_uptime + age && 2989 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2990 brt->brt_expire = time_uptime + age; 2991 } 2992 } 2993 BRIDGE_UNLOCK(sc); 2994 } 2995 2996 /* 2997 * bridge_state_change: 2998 * 2999 * Callback from the bridgestp code when a port changes states. 3000 */ 3001 static void 3002 bridge_state_change(struct ifnet *ifp, int state) 3003 { 3004 struct bridge_softc *sc = ifp->if_bridge; 3005 static const char *stpstates[] = { 3006 "disabled", 3007 "listening", 3008 "learning", 3009 "forwarding", 3010 "blocking", 3011 "discarding" 3012 }; 3013 3014 if (log_stp) 3015 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3016 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3017 } 3018 3019 /* 3020 * Send bridge packets through pfil if they are one of the types pfil can deal 3021 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3022 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3023 * that interface. 3024 */ 3025 static int 3026 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3027 { 3028 int snap, error, i, hlen; 3029 struct ether_header *eh1, eh2; 3030 struct ip *ip; 3031 struct llc llc1; 3032 u_int16_t ether_type; 3033 3034 snap = 0; 3035 error = -1; /* Default error if not error == 0 */ 3036 3037 #if 0 3038 /* we may return with the IP fields swapped, ensure its not shared */ 3039 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3040 #endif 3041 3042 if (pfil_bridge == 0 && pfil_member == 0 && pfil_ipfw == 0) 3043 return (0); /* filtering is disabled */ 3044 3045 i = min((*mp)->m_pkthdr.len, max_protohdr); 3046 if ((*mp)->m_len < i) { 3047 *mp = m_pullup(*mp, i); 3048 if (*mp == NULL) { 3049 printf("%s: m_pullup failed\n", __func__); 3050 return (-1); 3051 } 3052 } 3053 3054 eh1 = mtod(*mp, struct ether_header *); 3055 ether_type = ntohs(eh1->ether_type); 3056 3057 /* 3058 * Check for SNAP/LLC. 3059 */ 3060 if (ether_type < ETHERMTU) { 3061 struct llc *llc2 = (struct llc *)(eh1 + 1); 3062 3063 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3064 llc2->llc_dsap == LLC_SNAP_LSAP && 3065 llc2->llc_ssap == LLC_SNAP_LSAP && 3066 llc2->llc_control == LLC_UI) { 3067 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3068 snap = 1; 3069 } 3070 } 3071 3072 /* 3073 * If we're trying to filter bridge traffic, don't look at anything 3074 * other than IP and ARP traffic. If the filter doesn't understand 3075 * IPv6, don't allow IPv6 through the bridge either. This is lame 3076 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3077 * but of course we don't have an AppleTalk filter to begin with. 3078 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3079 * ARP traffic.) 3080 */ 3081 switch (ether_type) { 3082 case ETHERTYPE_ARP: 3083 case ETHERTYPE_REVARP: 3084 if (pfil_ipfw_arp == 0) 3085 return (0); /* Automatically pass */ 3086 break; 3087 3088 case ETHERTYPE_IP: 3089 #ifdef INET6 3090 case ETHERTYPE_IPV6: 3091 #endif /* INET6 */ 3092 break; 3093 default: 3094 /* 3095 * Check to see if the user wants to pass non-ip 3096 * packets, these will not be checked by pfil(9) and 3097 * passed unconditionally so the default is to drop. 3098 */ 3099 if (pfil_onlyip) 3100 goto bad; 3101 } 3102 3103 /* Run the packet through pfil before stripping link headers */ 3104 if (PFIL_HOOKED(&V_link_pfil_hook) && pfil_ipfw != 0 && 3105 dir == PFIL_OUT && ifp != NULL) { 3106 3107 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL); 3108 3109 if (*mp == NULL || error != 0) /* packet consumed by filter */ 3110 return (error); 3111 } 3112 3113 /* Strip off the Ethernet header and keep a copy. */ 3114 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3115 m_adj(*mp, ETHER_HDR_LEN); 3116 3117 /* Strip off snap header, if present */ 3118 if (snap) { 3119 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3120 m_adj(*mp, sizeof(struct llc)); 3121 } 3122 3123 /* 3124 * Check the IP header for alignment and errors 3125 */ 3126 if (dir == PFIL_IN) { 3127 switch (ether_type) { 3128 case ETHERTYPE_IP: 3129 error = bridge_ip_checkbasic(mp); 3130 break; 3131 #ifdef INET6 3132 case ETHERTYPE_IPV6: 3133 error = bridge_ip6_checkbasic(mp); 3134 break; 3135 #endif /* INET6 */ 3136 default: 3137 error = 0; 3138 } 3139 if (error) 3140 goto bad; 3141 } 3142 3143 error = 0; 3144 3145 /* 3146 * Run the packet through pfil 3147 */ 3148 switch (ether_type) { 3149 case ETHERTYPE_IP: 3150 /* 3151 * Run pfil on the member interface and the bridge, both can 3152 * be skipped by clearing pfil_member or pfil_bridge. 3153 * 3154 * Keep the order: 3155 * in_if -> bridge_if -> out_if 3156 */ 3157 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3158 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3159 dir, NULL); 3160 3161 if (*mp == NULL || error != 0) /* filter may consume */ 3162 break; 3163 3164 if (pfil_member && ifp != NULL) 3165 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, 3166 dir, NULL); 3167 3168 if (*mp == NULL || error != 0) /* filter may consume */ 3169 break; 3170 3171 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3172 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3173 dir, NULL); 3174 3175 if (*mp == NULL || error != 0) /* filter may consume */ 3176 break; 3177 3178 /* check if we need to fragment the packet */ 3179 if (pfil_member && ifp != NULL && dir == PFIL_OUT) { 3180 i = (*mp)->m_pkthdr.len; 3181 if (i > ifp->if_mtu) { 3182 error = bridge_fragment(ifp, *mp, &eh2, snap, 3183 &llc1); 3184 return (error); 3185 } 3186 } 3187 3188 /* Recalculate the ip checksum. */ 3189 ip = mtod(*mp, struct ip *); 3190 hlen = ip->ip_hl << 2; 3191 if (hlen < sizeof(struct ip)) 3192 goto bad; 3193 if (hlen > (*mp)->m_len) { 3194 if ((*mp = m_pullup(*mp, hlen)) == 0) 3195 goto bad; 3196 ip = mtod(*mp, struct ip *); 3197 if (ip == NULL) 3198 goto bad; 3199 } 3200 ip->ip_sum = 0; 3201 if (hlen == sizeof(struct ip)) 3202 ip->ip_sum = in_cksum_hdr(ip); 3203 else 3204 ip->ip_sum = in_cksum(*mp, hlen); 3205 3206 break; 3207 #ifdef INET6 3208 case ETHERTYPE_IPV6: 3209 if (pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3210 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3211 dir, NULL); 3212 3213 if (*mp == NULL || error != 0) /* filter may consume */ 3214 break; 3215 3216 if (pfil_member && ifp != NULL) 3217 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp, 3218 dir, NULL); 3219 3220 if (*mp == NULL || error != 0) /* filter may consume */ 3221 break; 3222 3223 if (pfil_bridge && dir == PFIL_IN && bifp != NULL) 3224 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3225 dir, NULL); 3226 break; 3227 #endif 3228 default: 3229 error = 0; 3230 break; 3231 } 3232 3233 if (*mp == NULL) 3234 return (error); 3235 if (error != 0) 3236 goto bad; 3237 3238 error = -1; 3239 3240 /* 3241 * Finally, put everything back the way it was and return 3242 */ 3243 if (snap) { 3244 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 3245 if (*mp == NULL) 3246 return (error); 3247 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3248 } 3249 3250 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 3251 if (*mp == NULL) 3252 return (error); 3253 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3254 3255 return (0); 3256 3257 bad: 3258 m_freem(*mp); 3259 *mp = NULL; 3260 return (error); 3261 } 3262 3263 /* 3264 * Perform basic checks on header size since 3265 * pfil assumes ip_input has already processed 3266 * it for it. Cut-and-pasted from ip_input.c. 3267 * Given how simple the IPv6 version is, 3268 * does the IPv4 version really need to be 3269 * this complicated? 3270 * 3271 * XXX Should we update ipstat here, or not? 3272 * XXX Right now we update ipstat but not 3273 * XXX csum_counter. 3274 */ 3275 static int 3276 bridge_ip_checkbasic(struct mbuf **mp) 3277 { 3278 struct mbuf *m = *mp; 3279 struct ip *ip; 3280 int len, hlen; 3281 u_short sum; 3282 3283 if (*mp == NULL) 3284 return (-1); 3285 3286 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3287 if ((m = m_copyup(m, sizeof(struct ip), 3288 (max_linkhdr + 3) & ~3)) == NULL) { 3289 /* XXXJRT new stat, please */ 3290 KMOD_IPSTAT_INC(ips_toosmall); 3291 goto bad; 3292 } 3293 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3294 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3295 KMOD_IPSTAT_INC(ips_toosmall); 3296 goto bad; 3297 } 3298 } 3299 ip = mtod(m, struct ip *); 3300 if (ip == NULL) goto bad; 3301 3302 if (ip->ip_v != IPVERSION) { 3303 KMOD_IPSTAT_INC(ips_badvers); 3304 goto bad; 3305 } 3306 hlen = ip->ip_hl << 2; 3307 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3308 KMOD_IPSTAT_INC(ips_badhlen); 3309 goto bad; 3310 } 3311 if (hlen > m->m_len) { 3312 if ((m = m_pullup(m, hlen)) == 0) { 3313 KMOD_IPSTAT_INC(ips_badhlen); 3314 goto bad; 3315 } 3316 ip = mtod(m, struct ip *); 3317 if (ip == NULL) goto bad; 3318 } 3319 3320 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3321 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3322 } else { 3323 if (hlen == sizeof(struct ip)) { 3324 sum = in_cksum_hdr(ip); 3325 } else { 3326 sum = in_cksum(m, hlen); 3327 } 3328 } 3329 if (sum) { 3330 KMOD_IPSTAT_INC(ips_badsum); 3331 goto bad; 3332 } 3333 3334 /* Retrieve the packet length. */ 3335 len = ntohs(ip->ip_len); 3336 3337 /* 3338 * Check for additional length bogosity 3339 */ 3340 if (len < hlen) { 3341 KMOD_IPSTAT_INC(ips_badlen); 3342 goto bad; 3343 } 3344 3345 /* 3346 * Check that the amount of data in the buffers 3347 * is as at least much as the IP header would have us expect. 3348 * Drop packet if shorter than we expect. 3349 */ 3350 if (m->m_pkthdr.len < len) { 3351 KMOD_IPSTAT_INC(ips_tooshort); 3352 goto bad; 3353 } 3354 3355 /* Checks out, proceed */ 3356 *mp = m; 3357 return (0); 3358 3359 bad: 3360 *mp = m; 3361 return (-1); 3362 } 3363 3364 #ifdef INET6 3365 /* 3366 * Same as above, but for IPv6. 3367 * Cut-and-pasted from ip6_input.c. 3368 * XXX Should we update ip6stat, or not? 3369 */ 3370 static int 3371 bridge_ip6_checkbasic(struct mbuf **mp) 3372 { 3373 struct mbuf *m = *mp; 3374 struct ip6_hdr *ip6; 3375 3376 /* 3377 * If the IPv6 header is not aligned, slurp it up into a new 3378 * mbuf with space for link headers, in the event we forward 3379 * it. Otherwise, if it is aligned, make sure the entire base 3380 * IPv6 header is in the first mbuf of the chain. 3381 */ 3382 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3383 struct ifnet *inifp = m->m_pkthdr.rcvif; 3384 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3385 (max_linkhdr + 3) & ~3)) == NULL) { 3386 /* XXXJRT new stat, please */ 3387 IP6STAT_INC(ip6s_toosmall); 3388 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3389 goto bad; 3390 } 3391 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3392 struct ifnet *inifp = m->m_pkthdr.rcvif; 3393 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3394 IP6STAT_INC(ip6s_toosmall); 3395 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3396 goto bad; 3397 } 3398 } 3399 3400 ip6 = mtod(m, struct ip6_hdr *); 3401 3402 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3403 IP6STAT_INC(ip6s_badvers); 3404 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3405 goto bad; 3406 } 3407 3408 /* Checks out, proceed */ 3409 *mp = m; 3410 return (0); 3411 3412 bad: 3413 *mp = m; 3414 return (-1); 3415 } 3416 #endif /* INET6 */ 3417 3418 /* 3419 * bridge_fragment: 3420 * 3421 * Return a fragmented mbuf chain. 3422 */ 3423 static int 3424 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, 3425 int snap, struct llc *llc) 3426 { 3427 struct mbuf *m0; 3428 struct ip *ip; 3429 int error = -1; 3430 3431 if (m->m_len < sizeof(struct ip) && 3432 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3433 goto out; 3434 ip = mtod(m, struct ip *); 3435 3436 m->m_pkthdr.csum_flags |= CSUM_IP; 3437 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 3438 if (error) 3439 goto out; 3440 3441 /* walk the chain and re-add the Ethernet header */ 3442 for (m0 = m; m0; m0 = m0->m_nextpkt) { 3443 if (error == 0) { 3444 if (snap) { 3445 M_PREPEND(m0, sizeof(struct llc), M_NOWAIT); 3446 if (m0 == NULL) { 3447 error = ENOBUFS; 3448 continue; 3449 } 3450 bcopy(llc, mtod(m0, caddr_t), 3451 sizeof(struct llc)); 3452 } 3453 M_PREPEND(m0, ETHER_HDR_LEN, M_NOWAIT); 3454 if (m0 == NULL) { 3455 error = ENOBUFS; 3456 continue; 3457 } 3458 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); 3459 } else 3460 m_freem(m); 3461 } 3462 3463 if (error == 0) 3464 KMOD_IPSTAT_INC(ips_fragmented); 3465 3466 return (error); 3467 3468 out: 3469 if (m != NULL) 3470 m_freem(m); 3471 return (error); 3472 } 3473 3474 static void 3475 bridge_linkstate(struct ifnet *ifp) 3476 { 3477 struct bridge_softc *sc = ifp->if_bridge; 3478 struct bridge_iflist *bif; 3479 3480 BRIDGE_LOCK(sc); 3481 bif = bridge_lookup_member_if(sc, ifp); 3482 if (bif == NULL) { 3483 BRIDGE_UNLOCK(sc); 3484 return; 3485 } 3486 bridge_linkcheck(sc); 3487 BRIDGE_UNLOCK(sc); 3488 3489 bstp_linkstate(&bif->bif_stp); 3490 } 3491 3492 static void 3493 bridge_linkcheck(struct bridge_softc *sc) 3494 { 3495 struct bridge_iflist *bif; 3496 int new_link, hasls; 3497 3498 BRIDGE_LOCK_ASSERT(sc); 3499 new_link = LINK_STATE_DOWN; 3500 hasls = 0; 3501 /* Our link is considered up if at least one of our ports is active */ 3502 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3503 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3504 hasls++; 3505 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3506 new_link = LINK_STATE_UP; 3507 break; 3508 } 3509 } 3510 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3511 /* If no interfaces support link-state then we default to up */ 3512 new_link = LINK_STATE_UP; 3513 } 3514 if_link_state_change(sc->sc_ifp, new_link); 3515 }
Cache object: 877c5d493ce1358731ede03b39b6396f
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