1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) 40 * All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 52 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 53 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 54 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 55 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 56 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 57 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 59 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 60 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 61 * POSSIBILITY OF SUCH DAMAGE. 62 * 63 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 64 */ 65 66 /* 67 * Network interface bridge support. 68 * 69 * TODO: 70 * 71 * - Currently only supports Ethernet-like interfaces (Ethernet, 72 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 73 * to bridge other types of interfaces (FDDI-FDDI, and maybe 74 * consider heterogenous bridges). 75 */ 76 77 #include <sys/cdefs.h> 78 __FBSDID("$FreeBSD$"); 79 80 #include "opt_inet.h" 81 #include "opt_inet6.h" 82 83 #include <sys/param.h> 84 #include <sys/eventhandler.h> 85 #include <sys/mbuf.h> 86 #include <sys/malloc.h> 87 #include <sys/protosw.h> 88 #include <sys/systm.h> 89 #include <sys/jail.h> 90 #include <sys/time.h> 91 #include <sys/socket.h> /* for net/if.h */ 92 #include <sys/sockio.h> 93 #include <sys/ctype.h> /* string functions */ 94 #include <sys/kernel.h> 95 #include <sys/random.h> 96 #include <sys/syslog.h> 97 #include <sys/sysctl.h> 98 #include <vm/uma.h> 99 #include <sys/module.h> 100 #include <sys/priv.h> 101 #include <sys/proc.h> 102 #include <sys/lock.h> 103 #include <sys/mutex.h> 104 105 #include <net/bpf.h> 106 #include <net/if.h> 107 #include <net/if_clone.h> 108 #include <net/if_dl.h> 109 #include <net/if_types.h> 110 #include <net/if_var.h> 111 #include <net/pfil.h> 112 #include <net/vnet.h> 113 114 #include <netinet/in.h> 115 #include <netinet/in_systm.h> 116 #include <netinet/in_var.h> 117 #include <netinet/ip.h> 118 #include <netinet/ip_var.h> 119 #ifdef INET6 120 #include <netinet/ip6.h> 121 #include <netinet6/ip6_var.h> 122 #include <netinet6/in6_ifattach.h> 123 #endif 124 #if defined(INET) || defined(INET6) 125 #include <netinet/ip_carp.h> 126 #endif 127 #include <machine/in_cksum.h> 128 #include <netinet/if_ether.h> 129 #include <net/bridgestp.h> 130 #include <net/if_bridgevar.h> 131 #include <net/if_llc.h> 132 #include <net/if_vlan_var.h> 133 134 #include <net/route.h> 135 136 /* 137 * Size of the route hash table. Must be a power of two. 138 */ 139 #ifndef BRIDGE_RTHASH_SIZE 140 #define BRIDGE_RTHASH_SIZE 1024 141 #endif 142 143 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 144 145 /* 146 * Default maximum number of addresses to cache. 147 */ 148 #ifndef BRIDGE_RTABLE_MAX 149 #define BRIDGE_RTABLE_MAX 2000 150 #endif 151 152 /* 153 * Timeout (in seconds) for entries learned dynamically. 154 */ 155 #ifndef BRIDGE_RTABLE_TIMEOUT 156 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 157 #endif 158 159 /* 160 * Number of seconds between walks of the route list. 161 */ 162 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 163 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 164 #endif 165 166 /* 167 * List of capabilities to possibly mask on the member interface. 168 */ 169 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM) 170 171 /* 172 * List of capabilities to strip 173 */ 174 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 175 176 /* 177 * Bridge interface list entry. 178 */ 179 struct bridge_iflist { 180 LIST_ENTRY(bridge_iflist) bif_next; 181 struct ifnet *bif_ifp; /* member if */ 182 struct bstp_port bif_stp; /* STP state */ 183 uint32_t bif_flags; /* member if flags */ 184 int bif_savedcaps; /* saved capabilities */ 185 uint32_t bif_addrmax; /* max # of addresses */ 186 uint32_t bif_addrcnt; /* cur. # of addresses */ 187 uint32_t bif_addrexceeded;/* # of address violations */ 188 }; 189 190 /* 191 * Bridge route node. 192 */ 193 struct bridge_rtnode { 194 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 195 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 196 struct bridge_iflist *brt_dst; /* destination if */ 197 unsigned long brt_expire; /* expiration time */ 198 uint8_t brt_flags; /* address flags */ 199 uint8_t brt_addr[ETHER_ADDR_LEN]; 200 uint16_t brt_vlan; /* vlan id */ 201 }; 202 #define brt_ifp brt_dst->bif_ifp 203 204 /* 205 * Software state for each bridge. 206 */ 207 struct bridge_softc { 208 struct ifnet *sc_ifp; /* make this an interface */ 209 LIST_ENTRY(bridge_softc) sc_list; 210 struct mtx sc_mtx; 211 struct cv sc_cv; 212 uint32_t sc_brtmax; /* max # of addresses */ 213 uint32_t sc_brtcnt; /* cur. # of addresses */ 214 uint32_t sc_brttimeout; /* rt timeout in seconds */ 215 struct callout sc_brcallout; /* bridge callout */ 216 uint32_t sc_iflist_ref; /* refcount for sc_iflist */ 217 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ 218 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 219 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 220 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 221 uint32_t sc_rthash_key; /* key for hash */ 222 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 223 struct bstp_state sc_stp; /* STP state */ 224 uint32_t sc_brtexceeded; /* # of cache drops */ 225 struct ifnet *sc_ifaddr; /* member mac copied from */ 226 u_char sc_defaddr[6]; /* Default MAC address */ 227 }; 228 229 static VNET_DEFINE(struct mtx, bridge_list_mtx); 230 #define V_bridge_list_mtx VNET(bridge_list_mtx) 231 static eventhandler_tag bridge_detach_cookie; 232 233 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 234 235 uma_zone_t bridge_rtnode_zone; 236 237 static int bridge_clone_create(struct if_clone *, int, caddr_t); 238 static void bridge_clone_destroy(struct ifnet *); 239 240 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 241 static void bridge_mutecaps(struct bridge_softc *); 242 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 243 int); 244 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 245 static void bridge_init(void *); 246 static void bridge_dummynet(struct mbuf *, struct ifnet *); 247 static void bridge_stop(struct ifnet *, int); 248 static int bridge_transmit(struct ifnet *, struct mbuf *); 249 static void bridge_qflush(struct ifnet *); 250 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 251 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 252 struct rtentry *); 253 static int bridge_enqueue(struct bridge_softc *, struct ifnet *, 254 struct mbuf *); 255 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 256 257 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 258 struct mbuf *m); 259 260 static void bridge_timer(void *); 261 262 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 263 struct mbuf *, int); 264 static void bridge_span(struct bridge_softc *, struct mbuf *); 265 266 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 267 uint16_t, struct bridge_iflist *, int, uint8_t); 268 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 269 uint16_t); 270 static void bridge_rttrim(struct bridge_softc *); 271 static void bridge_rtage(struct bridge_softc *); 272 static void bridge_rtflush(struct bridge_softc *, int); 273 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 274 uint16_t); 275 276 static void bridge_rtable_init(struct bridge_softc *); 277 static void bridge_rtable_fini(struct bridge_softc *); 278 279 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 280 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 281 const uint8_t *, uint16_t); 282 static int bridge_rtnode_insert(struct bridge_softc *, 283 struct bridge_rtnode *); 284 static void bridge_rtnode_destroy(struct bridge_softc *, 285 struct bridge_rtnode *); 286 static void bridge_rtable_expire(struct ifnet *, int); 287 static void bridge_state_change(struct ifnet *, int); 288 289 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 290 const char *name); 291 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 292 struct ifnet *ifp); 293 static void bridge_delete_member(struct bridge_softc *, 294 struct bridge_iflist *, int); 295 static void bridge_delete_span(struct bridge_softc *, 296 struct bridge_iflist *); 297 298 static int bridge_ioctl_add(struct bridge_softc *, void *); 299 static int bridge_ioctl_del(struct bridge_softc *, void *); 300 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 301 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 302 static int bridge_ioctl_scache(struct bridge_softc *, void *); 303 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 304 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 305 static int bridge_ioctl_rts(struct bridge_softc *, void *); 306 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 307 static int bridge_ioctl_sto(struct bridge_softc *, void *); 308 static int bridge_ioctl_gto(struct bridge_softc *, void *); 309 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 310 static int bridge_ioctl_flush(struct bridge_softc *, void *); 311 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 312 static int bridge_ioctl_spri(struct bridge_softc *, void *); 313 static int bridge_ioctl_ght(struct bridge_softc *, void *); 314 static int bridge_ioctl_sht(struct bridge_softc *, void *); 315 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 316 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 317 static int bridge_ioctl_gma(struct bridge_softc *, void *); 318 static int bridge_ioctl_sma(struct bridge_softc *, void *); 319 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 320 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 321 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 322 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 323 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 324 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 325 static int bridge_ioctl_grte(struct bridge_softc *, void *); 326 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 327 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 328 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 329 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 330 int); 331 static int bridge_ip_checkbasic(struct mbuf **mp); 332 #ifdef INET6 333 static int bridge_ip6_checkbasic(struct mbuf **mp); 334 #endif /* INET6 */ 335 static int bridge_fragment(struct ifnet *, struct mbuf *, 336 struct ether_header *, int, struct llc *); 337 static void bridge_linkstate(struct ifnet *ifp); 338 static void bridge_linkcheck(struct bridge_softc *sc); 339 340 extern void (*bridge_linkstate_p)(struct ifnet *ifp); 341 342 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 343 #define VLANTAGOF(_m) \ 344 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 345 346 static struct bstp_cb_ops bridge_ops = { 347 .bcb_state = bridge_state_change, 348 .bcb_rtage = bridge_rtable_expire 349 }; 350 351 SYSCTL_DECL(_net_link); 352 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 353 354 /* only pass IP[46] packets when pfil is enabled */ 355 static VNET_DEFINE(int, pfil_onlyip) = 1; 356 #define V_pfil_onlyip VNET(pfil_onlyip) 357 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, 358 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0, 359 "Only pass IP packets when pfil is enabled"); 360 361 /* run pfil hooks on the bridge interface */ 362 static VNET_DEFINE(int, pfil_bridge) = 1; 363 #define V_pfil_bridge VNET(pfil_bridge) 364 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, 365 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0, 366 "Packet filter on the bridge interface"); 367 368 /* layer2 filter with ipfw */ 369 static VNET_DEFINE(int, pfil_ipfw); 370 #define V_pfil_ipfw VNET(pfil_ipfw) 371 372 /* layer2 ARP filter with ipfw */ 373 static VNET_DEFINE(int, pfil_ipfw_arp); 374 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp) 375 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, 376 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0, 377 "Filter ARP packets through IPFW layer2"); 378 379 /* run pfil hooks on the member interface */ 380 static VNET_DEFINE(int, pfil_member) = 1; 381 #define V_pfil_member VNET(pfil_member) 382 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, 383 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0, 384 "Packet filter on the member interface"); 385 386 /* run pfil hooks on the physical interface for locally destined packets */ 387 static VNET_DEFINE(int, pfil_local_phys); 388 #define V_pfil_local_phys VNET(pfil_local_phys) 389 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, 390 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0, 391 "Packet filter on the physical interface for locally destined packets"); 392 393 /* log STP state changes */ 394 static VNET_DEFINE(int, log_stp); 395 #define V_log_stp VNET(log_stp) 396 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, 397 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0, 398 "Log STP state changes"); 399 400 /* share MAC with first bridge member */ 401 static VNET_DEFINE(int, bridge_inherit_mac); 402 #define V_bridge_inherit_mac VNET(bridge_inherit_mac) 403 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, 404 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0, 405 "Inherit MAC address from the first bridge member"); 406 407 static VNET_DEFINE(int, allow_llz_overlap) = 0; 408 #define V_allow_llz_overlap VNET(allow_llz_overlap) 409 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, 410 CTLFLAG_VNET | CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0, 411 "Allow overlap of link-local scope " 412 "zones of a bridge interface and the member interfaces"); 413 414 struct bridge_control { 415 int (*bc_func)(struct bridge_softc *, void *); 416 int bc_argsize; 417 int bc_flags; 418 }; 419 420 #define BC_F_COPYIN 0x01 /* copy arguments in */ 421 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 422 #define BC_F_SUSER 0x04 /* do super-user check */ 423 424 const struct bridge_control bridge_control_table[] = { 425 { bridge_ioctl_add, sizeof(struct ifbreq), 426 BC_F_COPYIN|BC_F_SUSER }, 427 { bridge_ioctl_del, sizeof(struct ifbreq), 428 BC_F_COPYIN|BC_F_SUSER }, 429 430 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 431 BC_F_COPYIN|BC_F_COPYOUT }, 432 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 433 BC_F_COPYIN|BC_F_SUSER }, 434 435 { bridge_ioctl_scache, sizeof(struct ifbrparam), 436 BC_F_COPYIN|BC_F_SUSER }, 437 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 438 BC_F_COPYOUT }, 439 440 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 441 BC_F_COPYIN|BC_F_COPYOUT }, 442 { bridge_ioctl_rts, sizeof(struct ifbaconf), 443 BC_F_COPYIN|BC_F_COPYOUT }, 444 445 { bridge_ioctl_saddr, sizeof(struct ifbareq), 446 BC_F_COPYIN|BC_F_SUSER }, 447 448 { bridge_ioctl_sto, sizeof(struct ifbrparam), 449 BC_F_COPYIN|BC_F_SUSER }, 450 { bridge_ioctl_gto, sizeof(struct ifbrparam), 451 BC_F_COPYOUT }, 452 453 { bridge_ioctl_daddr, sizeof(struct ifbareq), 454 BC_F_COPYIN|BC_F_SUSER }, 455 456 { bridge_ioctl_flush, sizeof(struct ifbreq), 457 BC_F_COPYIN|BC_F_SUSER }, 458 459 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 460 BC_F_COPYOUT }, 461 { bridge_ioctl_spri, sizeof(struct ifbrparam), 462 BC_F_COPYIN|BC_F_SUSER }, 463 464 { bridge_ioctl_ght, sizeof(struct ifbrparam), 465 BC_F_COPYOUT }, 466 { bridge_ioctl_sht, sizeof(struct ifbrparam), 467 BC_F_COPYIN|BC_F_SUSER }, 468 469 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 470 BC_F_COPYOUT }, 471 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 472 BC_F_COPYIN|BC_F_SUSER }, 473 474 { bridge_ioctl_gma, sizeof(struct ifbrparam), 475 BC_F_COPYOUT }, 476 { bridge_ioctl_sma, sizeof(struct ifbrparam), 477 BC_F_COPYIN|BC_F_SUSER }, 478 479 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 480 BC_F_COPYIN|BC_F_SUSER }, 481 482 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 483 BC_F_COPYIN|BC_F_SUSER }, 484 485 { bridge_ioctl_addspan, sizeof(struct ifbreq), 486 BC_F_COPYIN|BC_F_SUSER }, 487 { bridge_ioctl_delspan, sizeof(struct ifbreq), 488 BC_F_COPYIN|BC_F_SUSER }, 489 490 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 491 BC_F_COPYOUT }, 492 493 { bridge_ioctl_grte, sizeof(struct ifbrparam), 494 BC_F_COPYOUT }, 495 496 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 497 BC_F_COPYIN|BC_F_COPYOUT }, 498 499 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 500 BC_F_COPYIN|BC_F_SUSER }, 501 502 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 503 BC_F_COPYIN|BC_F_SUSER }, 504 505 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 506 BC_F_COPYIN|BC_F_SUSER }, 507 508 }; 509 const int bridge_control_table_size = nitems(bridge_control_table); 510 511 static VNET_DEFINE(LIST_HEAD(, bridge_softc), bridge_list); 512 #define V_bridge_list VNET(bridge_list) 513 #define BRIDGE_LIST_LOCK_INIT(x) mtx_init(&V_bridge_list_mtx, \ 514 "if_bridge list", NULL, MTX_DEF) 515 #define BRIDGE_LIST_LOCK_DESTROY(x) mtx_destroy(&V_bridge_list_mtx) 516 #define BRIDGE_LIST_LOCK(x) mtx_lock(&V_bridge_list_mtx) 517 #define BRIDGE_LIST_UNLOCK(x) mtx_unlock(&V_bridge_list_mtx) 518 519 static VNET_DEFINE(struct if_clone *, bridge_cloner); 520 #define V_bridge_cloner VNET(bridge_cloner) 521 522 static const char bridge_name[] = "bridge"; 523 524 static void 525 vnet_bridge_init(const void *unused __unused) 526 { 527 528 BRIDGE_LIST_LOCK_INIT(); 529 LIST_INIT(&V_bridge_list); 530 V_bridge_cloner = if_clone_simple(bridge_name, 531 bridge_clone_create, bridge_clone_destroy, 0); 532 } 533 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 534 vnet_bridge_init, NULL); 535 536 static void 537 vnet_bridge_uninit(const void *unused __unused) 538 { 539 540 if_clone_detach(V_bridge_cloner); 541 V_bridge_cloner = NULL; 542 BRIDGE_LIST_LOCK_DESTROY(); 543 } 544 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 545 vnet_bridge_uninit, NULL); 546 547 static int 548 bridge_modevent(module_t mod, int type, void *data) 549 { 550 551 switch (type) { 552 case MOD_LOAD: 553 bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 554 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 555 UMA_ALIGN_PTR, 0); 556 bridge_input_p = bridge_input; 557 bridge_output_p = bridge_output; 558 bridge_dn_p = bridge_dummynet; 559 bridge_linkstate_p = bridge_linkstate; 560 bridge_detach_cookie = EVENTHANDLER_REGISTER( 561 ifnet_departure_event, bridge_ifdetach, NULL, 562 EVENTHANDLER_PRI_ANY); 563 break; 564 case MOD_UNLOAD: 565 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 566 bridge_detach_cookie); 567 uma_zdestroy(bridge_rtnode_zone); 568 bridge_input_p = NULL; 569 bridge_output_p = NULL; 570 bridge_dn_p = NULL; 571 bridge_linkstate_p = NULL; 572 break; 573 default: 574 return (EOPNOTSUPP); 575 } 576 return (0); 577 } 578 579 static moduledata_t bridge_mod = { 580 "if_bridge", 581 bridge_modevent, 582 0 583 }; 584 585 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 586 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 587 588 /* 589 * handler for net.link.bridge.ipfw 590 */ 591 static int 592 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 593 { 594 int enable = V_pfil_ipfw; 595 int error; 596 597 error = sysctl_handle_int(oidp, &enable, 0, req); 598 enable &= 1; 599 600 if (enable != V_pfil_ipfw) { 601 V_pfil_ipfw = enable; 602 603 /* 604 * Disable pfil so that ipfw doesnt run twice, if the user 605 * really wants both then they can re-enable pfil_bridge and/or 606 * pfil_member. Also allow non-ip packets as ipfw can filter by 607 * layer2 type. 608 */ 609 if (V_pfil_ipfw) { 610 V_pfil_onlyip = 0; 611 V_pfil_bridge = 0; 612 V_pfil_member = 0; 613 } 614 } 615 616 return (error); 617 } 618 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, 619 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET, 620 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I", 621 "Layer2 filter with IPFW"); 622 623 /* 624 * bridge_clone_create: 625 * 626 * Create a new bridge instance. 627 */ 628 static int 629 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 630 { 631 struct bridge_softc *sc, *sc2; 632 struct ifnet *bifp, *ifp; 633 int fb, retry; 634 unsigned long hostid; 635 636 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 637 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 638 if (ifp == NULL) { 639 free(sc, M_DEVBUF); 640 return (ENOSPC); 641 } 642 643 BRIDGE_LOCK_INIT(sc); 644 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 645 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 646 647 /* Initialize our routing table. */ 648 bridge_rtable_init(sc); 649 650 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 651 652 LIST_INIT(&sc->sc_iflist); 653 LIST_INIT(&sc->sc_spanlist); 654 655 ifp->if_softc = sc; 656 if_initname(ifp, bridge_name, unit); 657 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 658 ifp->if_ioctl = bridge_ioctl; 659 ifp->if_transmit = bridge_transmit; 660 ifp->if_qflush = bridge_qflush; 661 ifp->if_init = bridge_init; 662 ifp->if_type = IFT_BRIDGE; 663 664 /* 665 * Generate an ethernet address with a locally administered address. 666 * 667 * Since we are using random ethernet addresses for the bridge, it is 668 * possible that we might have address collisions, so make sure that 669 * this hardware address isn't already in use on another bridge. 670 * The first try uses the hostid and falls back to arc4rand(). 671 */ 672 fb = 0; 673 getcredhostid(curthread->td_ucred, &hostid); 674 do { 675 if (fb || hostid == 0) { 676 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1); 677 sc->sc_defaddr[0] &= ~1;/* clear multicast bit */ 678 sc->sc_defaddr[0] |= 2; /* set the LAA bit */ 679 } else { 680 sc->sc_defaddr[0] = 0x2; 681 sc->sc_defaddr[1] = (hostid >> 24) & 0xff; 682 sc->sc_defaddr[2] = (hostid >> 16) & 0xff; 683 sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff; 684 sc->sc_defaddr[4] = hostid & 0xff; 685 sc->sc_defaddr[5] = ifp->if_dunit & 0xff; 686 } 687 688 fb = 1; 689 retry = 0; 690 BRIDGE_LIST_LOCK(); 691 LIST_FOREACH(sc2, &V_bridge_list, sc_list) { 692 bifp = sc2->sc_ifp; 693 if (memcmp(sc->sc_defaddr, 694 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) { 695 retry = 1; 696 break; 697 } 698 } 699 BRIDGE_LIST_UNLOCK(); 700 } while (retry == 1); 701 702 bstp_attach(&sc->sc_stp, &bridge_ops); 703 ether_ifattach(ifp, sc->sc_defaddr); 704 /* Now undo some of the damage... */ 705 ifp->if_baudrate = 0; 706 ifp->if_type = IFT_BRIDGE; 707 708 BRIDGE_LIST_LOCK(); 709 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list); 710 BRIDGE_LIST_UNLOCK(); 711 712 return (0); 713 } 714 715 /* 716 * bridge_clone_destroy: 717 * 718 * Destroy a bridge instance. 719 */ 720 static void 721 bridge_clone_destroy(struct ifnet *ifp) 722 { 723 struct bridge_softc *sc = ifp->if_softc; 724 struct bridge_iflist *bif; 725 726 BRIDGE_LOCK(sc); 727 728 bridge_stop(ifp, 1); 729 ifp->if_flags &= ~IFF_UP; 730 731 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 732 bridge_delete_member(sc, bif, 0); 733 734 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 735 bridge_delete_span(sc, bif); 736 } 737 738 BRIDGE_UNLOCK(sc); 739 740 callout_drain(&sc->sc_brcallout); 741 742 BRIDGE_LIST_LOCK(); 743 LIST_REMOVE(sc, sc_list); 744 BRIDGE_LIST_UNLOCK(); 745 746 bstp_detach(&sc->sc_stp); 747 ether_ifdetach(ifp); 748 if_free(ifp); 749 750 /* Tear down the routing table. */ 751 bridge_rtable_fini(sc); 752 753 BRIDGE_LOCK_DESTROY(sc); 754 free(sc, M_DEVBUF); 755 } 756 757 /* 758 * bridge_ioctl: 759 * 760 * Handle a control request from the operator. 761 */ 762 static int 763 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 764 { 765 struct bridge_softc *sc = ifp->if_softc; 766 struct ifreq *ifr = (struct ifreq *)data; 767 struct bridge_iflist *bif; 768 struct thread *td = curthread; 769 union { 770 struct ifbreq ifbreq; 771 struct ifbifconf ifbifconf; 772 struct ifbareq ifbareq; 773 struct ifbaconf ifbaconf; 774 struct ifbrparam ifbrparam; 775 struct ifbropreq ifbropreq; 776 } args; 777 struct ifdrv *ifd = (struct ifdrv *) data; 778 const struct bridge_control *bc; 779 int error = 0; 780 781 switch (cmd) { 782 783 case SIOCADDMULTI: 784 case SIOCDELMULTI: 785 break; 786 787 case SIOCGDRVSPEC: 788 case SIOCSDRVSPEC: 789 if (ifd->ifd_cmd >= bridge_control_table_size) { 790 error = EINVAL; 791 break; 792 } 793 bc = &bridge_control_table[ifd->ifd_cmd]; 794 795 if (cmd == SIOCGDRVSPEC && 796 (bc->bc_flags & BC_F_COPYOUT) == 0) { 797 error = EINVAL; 798 break; 799 } 800 else if (cmd == SIOCSDRVSPEC && 801 (bc->bc_flags & BC_F_COPYOUT) != 0) { 802 error = EINVAL; 803 break; 804 } 805 806 if (bc->bc_flags & BC_F_SUSER) { 807 error = priv_check(td, PRIV_NET_BRIDGE); 808 if (error) 809 break; 810 } 811 812 if (ifd->ifd_len != bc->bc_argsize || 813 ifd->ifd_len > sizeof(args)) { 814 error = EINVAL; 815 break; 816 } 817 818 bzero(&args, sizeof(args)); 819 if (bc->bc_flags & BC_F_COPYIN) { 820 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 821 if (error) 822 break; 823 } 824 825 BRIDGE_LOCK(sc); 826 error = (*bc->bc_func)(sc, &args); 827 BRIDGE_UNLOCK(sc); 828 if (error) 829 break; 830 831 if (bc->bc_flags & BC_F_COPYOUT) 832 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 833 834 break; 835 836 case SIOCSIFFLAGS: 837 if (!(ifp->if_flags & IFF_UP) && 838 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 839 /* 840 * If interface is marked down and it is running, 841 * then stop and disable it. 842 */ 843 BRIDGE_LOCK(sc); 844 bridge_stop(ifp, 1); 845 BRIDGE_UNLOCK(sc); 846 } else if ((ifp->if_flags & IFF_UP) && 847 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 848 /* 849 * If interface is marked up and it is stopped, then 850 * start it. 851 */ 852 (*ifp->if_init)(sc); 853 } 854 break; 855 856 case SIOCSIFMTU: 857 if (ifr->ifr_mtu < 576) { 858 error = EINVAL; 859 break; 860 } 861 if (LIST_EMPTY(&sc->sc_iflist)) { 862 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 863 break; 864 } 865 BRIDGE_LOCK(sc); 866 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 867 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) { 868 log(LOG_NOTICE, "%s: invalid MTU: %u(%s)" 869 " != %d\n", sc->sc_ifp->if_xname, 870 bif->bif_ifp->if_mtu, 871 bif->bif_ifp->if_xname, ifr->ifr_mtu); 872 error = EINVAL; 873 break; 874 } 875 } 876 if (!error) 877 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 878 BRIDGE_UNLOCK(sc); 879 break; 880 default: 881 /* 882 * drop the lock as ether_ioctl() will call bridge_start() and 883 * cause the lock to be recursed. 884 */ 885 error = ether_ioctl(ifp, cmd, data); 886 break; 887 } 888 889 return (error); 890 } 891 892 /* 893 * bridge_mutecaps: 894 * 895 * Clear or restore unwanted capabilities on the member interface 896 */ 897 static void 898 bridge_mutecaps(struct bridge_softc *sc) 899 { 900 struct bridge_iflist *bif; 901 int enabled, mask; 902 903 /* Initial bitmask of capabilities to test */ 904 mask = BRIDGE_IFCAPS_MASK; 905 906 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 907 /* Every member must support it or its disabled */ 908 mask &= bif->bif_savedcaps; 909 } 910 911 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 912 enabled = bif->bif_ifp->if_capenable; 913 enabled &= ~BRIDGE_IFCAPS_STRIP; 914 /* strip off mask bits and enable them again if allowed */ 915 enabled &= ~BRIDGE_IFCAPS_MASK; 916 enabled |= mask; 917 bridge_set_ifcap(sc, bif, enabled); 918 } 919 920 } 921 922 static void 923 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 924 { 925 struct ifnet *ifp = bif->bif_ifp; 926 struct ifreq ifr; 927 int error; 928 929 bzero(&ifr, sizeof(ifr)); 930 ifr.ifr_reqcap = set; 931 932 if (ifp->if_capenable != set) { 933 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 934 if (error) 935 if_printf(sc->sc_ifp, 936 "error setting interface capabilities on %s\n", 937 ifp->if_xname); 938 } 939 } 940 941 /* 942 * bridge_lookup_member: 943 * 944 * Lookup a bridge member interface. 945 */ 946 static struct bridge_iflist * 947 bridge_lookup_member(struct bridge_softc *sc, const char *name) 948 { 949 struct bridge_iflist *bif; 950 struct ifnet *ifp; 951 952 BRIDGE_LOCK_ASSERT(sc); 953 954 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 955 ifp = bif->bif_ifp; 956 if (strcmp(ifp->if_xname, name) == 0) 957 return (bif); 958 } 959 960 return (NULL); 961 } 962 963 /* 964 * bridge_lookup_member_if: 965 * 966 * Lookup a bridge member interface by ifnet*. 967 */ 968 static struct bridge_iflist * 969 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 970 { 971 struct bridge_iflist *bif; 972 973 BRIDGE_LOCK_ASSERT(sc); 974 975 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 976 if (bif->bif_ifp == member_ifp) 977 return (bif); 978 } 979 980 return (NULL); 981 } 982 983 /* 984 * bridge_delete_member: 985 * 986 * Delete the specified member interface. 987 */ 988 static void 989 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 990 int gone) 991 { 992 struct ifnet *ifs = bif->bif_ifp; 993 struct ifnet *fif = NULL; 994 995 BRIDGE_LOCK_ASSERT(sc); 996 997 if (bif->bif_flags & IFBIF_STP) 998 bstp_disable(&bif->bif_stp); 999 1000 ifs->if_bridge = NULL; 1001 BRIDGE_XLOCK(sc); 1002 LIST_REMOVE(bif, bif_next); 1003 BRIDGE_XDROP(sc); 1004 1005 /* 1006 * If removing the interface that gave the bridge its mac address, set 1007 * the mac address of the bridge to the address of the next member, or 1008 * to its default address if no members are left. 1009 */ 1010 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) { 1011 if (LIST_EMPTY(&sc->sc_iflist)) { 1012 bcopy(sc->sc_defaddr, 1013 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1014 sc->sc_ifaddr = NULL; 1015 } else { 1016 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp; 1017 bcopy(IF_LLADDR(fif), 1018 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1019 sc->sc_ifaddr = fif; 1020 } 1021 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1022 } 1023 1024 bridge_linkcheck(sc); 1025 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 1026 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 1027 KASSERT(bif->bif_addrcnt == 0, 1028 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 1029 1030 BRIDGE_UNLOCK(sc); 1031 if (!gone) { 1032 switch (ifs->if_type) { 1033 case IFT_ETHER: 1034 case IFT_L2VLAN: 1035 /* 1036 * Take the interface out of promiscuous mode. 1037 */ 1038 (void) ifpromisc(ifs, 0); 1039 break; 1040 1041 case IFT_GIF: 1042 break; 1043 1044 default: 1045 #ifdef DIAGNOSTIC 1046 panic("bridge_delete_member: impossible"); 1047 #endif 1048 break; 1049 } 1050 /* reneable any interface capabilities */ 1051 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 1052 } 1053 bstp_destroy(&bif->bif_stp); /* prepare to free */ 1054 BRIDGE_LOCK(sc); 1055 free(bif, M_DEVBUF); 1056 } 1057 1058 /* 1059 * bridge_delete_span: 1060 * 1061 * Delete the specified span interface. 1062 */ 1063 static void 1064 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1065 { 1066 BRIDGE_LOCK_ASSERT(sc); 1067 1068 KASSERT(bif->bif_ifp->if_bridge == NULL, 1069 ("%s: not a span interface", __func__)); 1070 1071 LIST_REMOVE(bif, bif_next); 1072 free(bif, M_DEVBUF); 1073 } 1074 1075 static int 1076 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1077 { 1078 struct ifbreq *req = arg; 1079 struct bridge_iflist *bif = NULL; 1080 struct ifnet *ifs; 1081 int error = 0; 1082 1083 ifs = ifunit(req->ifbr_ifsname); 1084 if (ifs == NULL) 1085 return (ENOENT); 1086 if (ifs->if_ioctl == NULL) /* must be supported */ 1087 return (EINVAL); 1088 1089 /* If it's in the span list, it can't be a member. */ 1090 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1091 if (ifs == bif->bif_ifp) 1092 return (EBUSY); 1093 1094 if (ifs->if_bridge == sc) 1095 return (EEXIST); 1096 1097 if (ifs->if_bridge != NULL) 1098 return (EBUSY); 1099 1100 switch (ifs->if_type) { 1101 case IFT_ETHER: 1102 case IFT_L2VLAN: 1103 case IFT_GIF: 1104 /* permitted interface types */ 1105 break; 1106 default: 1107 return (EINVAL); 1108 } 1109 1110 #ifdef INET6 1111 /* 1112 * Two valid inet6 addresses with link-local scope must not be 1113 * on the parent interface and the member interfaces at the 1114 * same time. This restriction is needed to prevent violation 1115 * of link-local scope zone. Attempts to add a member 1116 * interface which has inet6 addresses when the parent has 1117 * inet6 triggers removal of all inet6 addresses on the member 1118 * interface. 1119 */ 1120 1121 /* Check if the parent interface has a link-local scope addr. */ 1122 if (V_allow_llz_overlap == 0 && 1123 in6ifa_llaonifp(sc->sc_ifp) != NULL) { 1124 /* 1125 * If any, remove all inet6 addresses from the member 1126 * interfaces. 1127 */ 1128 BRIDGE_XLOCK(sc); 1129 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1130 if (in6ifa_llaonifp(bif->bif_ifp)) { 1131 BRIDGE_UNLOCK(sc); 1132 in6_ifdetach(bif->bif_ifp); 1133 BRIDGE_LOCK(sc); 1134 if_printf(sc->sc_ifp, 1135 "IPv6 addresses on %s have been removed " 1136 "before adding it as a member to prevent " 1137 "IPv6 address scope violation.\n", 1138 bif->bif_ifp->if_xname); 1139 } 1140 } 1141 BRIDGE_XDROP(sc); 1142 if (in6ifa_llaonifp(ifs)) { 1143 BRIDGE_UNLOCK(sc); 1144 in6_ifdetach(ifs); 1145 BRIDGE_LOCK(sc); 1146 if_printf(sc->sc_ifp, 1147 "IPv6 addresses on %s have been removed " 1148 "before adding it as a member to prevent " 1149 "IPv6 address scope violation.\n", 1150 ifs->if_xname); 1151 } 1152 } 1153 #endif 1154 /* Allow the first Ethernet member to define the MTU */ 1155 if (LIST_EMPTY(&sc->sc_iflist)) 1156 sc->sc_ifp->if_mtu = ifs->if_mtu; 1157 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1158 if_printf(sc->sc_ifp, "invalid MTU: %u(%s) != %u\n", 1159 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu); 1160 return (EINVAL); 1161 } 1162 1163 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1164 if (bif == NULL) 1165 return (ENOMEM); 1166 1167 bif->bif_ifp = ifs; 1168 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1169 bif->bif_savedcaps = ifs->if_capenable; 1170 1171 /* 1172 * Assign the interface's MAC address to the bridge if it's the first 1173 * member and the MAC address of the bridge has not been changed from 1174 * the default randomly generated one. 1175 */ 1176 if (V_bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) && 1177 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) { 1178 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1179 sc->sc_ifaddr = ifs; 1180 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1181 } 1182 1183 ifs->if_bridge = sc; 1184 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1185 /* 1186 * XXX: XLOCK HERE!?! 1187 * 1188 * NOTE: insert_***HEAD*** should be safe for the traversals. 1189 */ 1190 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1191 1192 /* Set interface capabilities to the intersection set of all members */ 1193 bridge_mutecaps(sc); 1194 bridge_linkcheck(sc); 1195 1196 /* Place the interface into promiscuous mode */ 1197 switch (ifs->if_type) { 1198 case IFT_ETHER: 1199 case IFT_L2VLAN: 1200 BRIDGE_UNLOCK(sc); 1201 error = ifpromisc(ifs, 1); 1202 BRIDGE_LOCK(sc); 1203 break; 1204 } 1205 1206 if (error) { 1207 bridge_delete_member(sc, bif, 0); 1208 free(bif, M_DEVBUF); 1209 } 1210 return (error); 1211 } 1212 1213 static int 1214 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1215 { 1216 struct ifbreq *req = arg; 1217 struct bridge_iflist *bif; 1218 1219 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1220 if (bif == NULL) 1221 return (ENOENT); 1222 1223 bridge_delete_member(sc, bif, 0); 1224 1225 return (0); 1226 } 1227 1228 static int 1229 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1230 { 1231 struct ifbreq *req = arg; 1232 struct bridge_iflist *bif; 1233 struct bstp_port *bp; 1234 1235 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1236 if (bif == NULL) 1237 return (ENOENT); 1238 1239 bp = &bif->bif_stp; 1240 req->ifbr_ifsflags = bif->bif_flags; 1241 req->ifbr_state = bp->bp_state; 1242 req->ifbr_priority = bp->bp_priority; 1243 req->ifbr_path_cost = bp->bp_path_cost; 1244 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1245 req->ifbr_proto = bp->bp_protover; 1246 req->ifbr_role = bp->bp_role; 1247 req->ifbr_stpflags = bp->bp_flags; 1248 req->ifbr_addrcnt = bif->bif_addrcnt; 1249 req->ifbr_addrmax = bif->bif_addrmax; 1250 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1251 1252 /* Copy STP state options as flags */ 1253 if (bp->bp_operedge) 1254 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1255 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1256 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1257 if (bp->bp_ptp_link) 1258 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1259 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1260 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1261 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1262 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1263 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1264 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1265 return (0); 1266 } 1267 1268 static int 1269 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1270 { 1271 struct ifbreq *req = arg; 1272 struct bridge_iflist *bif; 1273 struct bstp_port *bp; 1274 int error; 1275 1276 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1277 if (bif == NULL) 1278 return (ENOENT); 1279 bp = &bif->bif_stp; 1280 1281 if (req->ifbr_ifsflags & IFBIF_SPAN) 1282 /* SPAN is readonly */ 1283 return (EINVAL); 1284 1285 if (req->ifbr_ifsflags & IFBIF_STP) { 1286 if ((bif->bif_flags & IFBIF_STP) == 0) { 1287 error = bstp_enable(&bif->bif_stp); 1288 if (error) 1289 return (error); 1290 } 1291 } else { 1292 if ((bif->bif_flags & IFBIF_STP) != 0) 1293 bstp_disable(&bif->bif_stp); 1294 } 1295 1296 /* Pass on STP flags */ 1297 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1298 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1299 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1300 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1301 1302 /* Save the bits relating to the bridge */ 1303 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1304 1305 return (0); 1306 } 1307 1308 static int 1309 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1310 { 1311 struct ifbrparam *param = arg; 1312 1313 sc->sc_brtmax = param->ifbrp_csize; 1314 bridge_rttrim(sc); 1315 1316 return (0); 1317 } 1318 1319 static int 1320 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1321 { 1322 struct ifbrparam *param = arg; 1323 1324 param->ifbrp_csize = sc->sc_brtmax; 1325 1326 return (0); 1327 } 1328 1329 static int 1330 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1331 { 1332 struct ifbifconf *bifc = arg; 1333 struct bridge_iflist *bif; 1334 struct ifbreq breq; 1335 char *buf, *outbuf; 1336 int count, buflen, len, error = 0; 1337 1338 count = 0; 1339 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1340 count++; 1341 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1342 count++; 1343 1344 buflen = sizeof(breq) * count; 1345 if (bifc->ifbic_len == 0) { 1346 bifc->ifbic_len = buflen; 1347 return (0); 1348 } 1349 BRIDGE_UNLOCK(sc); 1350 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1351 BRIDGE_LOCK(sc); 1352 1353 count = 0; 1354 buf = outbuf; 1355 len = min(bifc->ifbic_len, buflen); 1356 bzero(&breq, sizeof(breq)); 1357 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1358 if (len < sizeof(breq)) 1359 break; 1360 1361 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1362 sizeof(breq.ifbr_ifsname)); 1363 /* Fill in the ifbreq structure */ 1364 error = bridge_ioctl_gifflags(sc, &breq); 1365 if (error) 1366 break; 1367 memcpy(buf, &breq, sizeof(breq)); 1368 count++; 1369 buf += sizeof(breq); 1370 len -= sizeof(breq); 1371 } 1372 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1373 if (len < sizeof(breq)) 1374 break; 1375 1376 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1377 sizeof(breq.ifbr_ifsname)); 1378 breq.ifbr_ifsflags = bif->bif_flags; 1379 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1380 memcpy(buf, &breq, sizeof(breq)); 1381 count++; 1382 buf += sizeof(breq); 1383 len -= sizeof(breq); 1384 } 1385 1386 BRIDGE_UNLOCK(sc); 1387 bifc->ifbic_len = sizeof(breq) * count; 1388 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1389 BRIDGE_LOCK(sc); 1390 free(outbuf, M_TEMP); 1391 return (error); 1392 } 1393 1394 static int 1395 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1396 { 1397 struct ifbaconf *bac = arg; 1398 struct bridge_rtnode *brt; 1399 struct ifbareq bareq; 1400 char *buf, *outbuf; 1401 int count, buflen, len, error = 0; 1402 1403 if (bac->ifbac_len == 0) 1404 return (0); 1405 1406 count = 0; 1407 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1408 count++; 1409 buflen = sizeof(bareq) * count; 1410 1411 BRIDGE_UNLOCK(sc); 1412 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1413 BRIDGE_LOCK(sc); 1414 1415 count = 0; 1416 buf = outbuf; 1417 len = min(bac->ifbac_len, buflen); 1418 bzero(&bareq, sizeof(bareq)); 1419 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1420 if (len < sizeof(bareq)) 1421 goto out; 1422 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1423 sizeof(bareq.ifba_ifsname)); 1424 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1425 bareq.ifba_vlan = brt->brt_vlan; 1426 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1427 time_uptime < brt->brt_expire) 1428 bareq.ifba_expire = brt->brt_expire - time_uptime; 1429 else 1430 bareq.ifba_expire = 0; 1431 bareq.ifba_flags = brt->brt_flags; 1432 1433 memcpy(buf, &bareq, sizeof(bareq)); 1434 count++; 1435 buf += sizeof(bareq); 1436 len -= sizeof(bareq); 1437 } 1438 out: 1439 BRIDGE_UNLOCK(sc); 1440 bac->ifbac_len = sizeof(bareq) * count; 1441 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1442 BRIDGE_LOCK(sc); 1443 free(outbuf, M_TEMP); 1444 return (error); 1445 } 1446 1447 static int 1448 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1449 { 1450 struct ifbareq *req = arg; 1451 struct bridge_iflist *bif; 1452 int error; 1453 1454 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1455 if (bif == NULL) 1456 return (ENOENT); 1457 1458 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1459 req->ifba_flags); 1460 1461 return (error); 1462 } 1463 1464 static int 1465 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1466 { 1467 struct ifbrparam *param = arg; 1468 1469 sc->sc_brttimeout = param->ifbrp_ctime; 1470 return (0); 1471 } 1472 1473 static int 1474 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1475 { 1476 struct ifbrparam *param = arg; 1477 1478 param->ifbrp_ctime = sc->sc_brttimeout; 1479 return (0); 1480 } 1481 1482 static int 1483 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1484 { 1485 struct ifbareq *req = arg; 1486 1487 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1488 } 1489 1490 static int 1491 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1492 { 1493 struct ifbreq *req = arg; 1494 1495 bridge_rtflush(sc, req->ifbr_ifsflags); 1496 return (0); 1497 } 1498 1499 static int 1500 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1501 { 1502 struct ifbrparam *param = arg; 1503 struct bstp_state *bs = &sc->sc_stp; 1504 1505 param->ifbrp_prio = bs->bs_bridge_priority; 1506 return (0); 1507 } 1508 1509 static int 1510 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1511 { 1512 struct ifbrparam *param = arg; 1513 1514 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1515 } 1516 1517 static int 1518 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1519 { 1520 struct ifbrparam *param = arg; 1521 struct bstp_state *bs = &sc->sc_stp; 1522 1523 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1524 return (0); 1525 } 1526 1527 static int 1528 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1529 { 1530 struct ifbrparam *param = arg; 1531 1532 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1533 } 1534 1535 static int 1536 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1537 { 1538 struct ifbrparam *param = arg; 1539 struct bstp_state *bs = &sc->sc_stp; 1540 1541 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1542 return (0); 1543 } 1544 1545 static int 1546 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1547 { 1548 struct ifbrparam *param = arg; 1549 1550 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1551 } 1552 1553 static int 1554 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1555 { 1556 struct ifbrparam *param = arg; 1557 struct bstp_state *bs = &sc->sc_stp; 1558 1559 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1560 return (0); 1561 } 1562 1563 static int 1564 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1565 { 1566 struct ifbrparam *param = arg; 1567 1568 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1569 } 1570 1571 static int 1572 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1573 { 1574 struct ifbreq *req = arg; 1575 struct bridge_iflist *bif; 1576 1577 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1578 if (bif == NULL) 1579 return (ENOENT); 1580 1581 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1582 } 1583 1584 static int 1585 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1586 { 1587 struct ifbreq *req = arg; 1588 struct bridge_iflist *bif; 1589 1590 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1591 if (bif == NULL) 1592 return (ENOENT); 1593 1594 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1595 } 1596 1597 static int 1598 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1599 { 1600 struct ifbreq *req = arg; 1601 struct bridge_iflist *bif; 1602 1603 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1604 if (bif == NULL) 1605 return (ENOENT); 1606 1607 bif->bif_addrmax = req->ifbr_addrmax; 1608 return (0); 1609 } 1610 1611 static int 1612 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1613 { 1614 struct ifbreq *req = arg; 1615 struct bridge_iflist *bif = NULL; 1616 struct ifnet *ifs; 1617 1618 ifs = ifunit(req->ifbr_ifsname); 1619 if (ifs == NULL) 1620 return (ENOENT); 1621 1622 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1623 if (ifs == bif->bif_ifp) 1624 return (EBUSY); 1625 1626 if (ifs->if_bridge != NULL) 1627 return (EBUSY); 1628 1629 switch (ifs->if_type) { 1630 case IFT_ETHER: 1631 case IFT_GIF: 1632 case IFT_L2VLAN: 1633 break; 1634 default: 1635 return (EINVAL); 1636 } 1637 1638 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1639 if (bif == NULL) 1640 return (ENOMEM); 1641 1642 bif->bif_ifp = ifs; 1643 bif->bif_flags = IFBIF_SPAN; 1644 1645 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1646 1647 return (0); 1648 } 1649 1650 static int 1651 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1652 { 1653 struct ifbreq *req = arg; 1654 struct bridge_iflist *bif; 1655 struct ifnet *ifs; 1656 1657 ifs = ifunit(req->ifbr_ifsname); 1658 if (ifs == NULL) 1659 return (ENOENT); 1660 1661 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1662 if (ifs == bif->bif_ifp) 1663 break; 1664 1665 if (bif == NULL) 1666 return (ENOENT); 1667 1668 bridge_delete_span(sc, bif); 1669 1670 return (0); 1671 } 1672 1673 static int 1674 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1675 { 1676 struct ifbropreq *req = arg; 1677 struct bstp_state *bs = &sc->sc_stp; 1678 struct bstp_port *root_port; 1679 1680 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1681 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1682 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1683 1684 root_port = bs->bs_root_port; 1685 if (root_port == NULL) 1686 req->ifbop_root_port = 0; 1687 else 1688 req->ifbop_root_port = root_port->bp_ifp->if_index; 1689 1690 req->ifbop_holdcount = bs->bs_txholdcount; 1691 req->ifbop_priority = bs->bs_bridge_priority; 1692 req->ifbop_protocol = bs->bs_protover; 1693 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1694 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1695 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1696 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1697 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1698 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1699 1700 return (0); 1701 } 1702 1703 static int 1704 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1705 { 1706 struct ifbrparam *param = arg; 1707 1708 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1709 return (0); 1710 } 1711 1712 static int 1713 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1714 { 1715 struct ifbpstpconf *bifstp = arg; 1716 struct bridge_iflist *bif; 1717 struct bstp_port *bp; 1718 struct ifbpstpreq bpreq; 1719 char *buf, *outbuf; 1720 int count, buflen, len, error = 0; 1721 1722 count = 0; 1723 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1724 if ((bif->bif_flags & IFBIF_STP) != 0) 1725 count++; 1726 } 1727 1728 buflen = sizeof(bpreq) * count; 1729 if (bifstp->ifbpstp_len == 0) { 1730 bifstp->ifbpstp_len = buflen; 1731 return (0); 1732 } 1733 1734 BRIDGE_UNLOCK(sc); 1735 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1736 BRIDGE_LOCK(sc); 1737 1738 count = 0; 1739 buf = outbuf; 1740 len = min(bifstp->ifbpstp_len, buflen); 1741 bzero(&bpreq, sizeof(bpreq)); 1742 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1743 if (len < sizeof(bpreq)) 1744 break; 1745 1746 if ((bif->bif_flags & IFBIF_STP) == 0) 1747 continue; 1748 1749 bp = &bif->bif_stp; 1750 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1751 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1752 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1753 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1754 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1755 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1756 1757 memcpy(buf, &bpreq, sizeof(bpreq)); 1758 count++; 1759 buf += sizeof(bpreq); 1760 len -= sizeof(bpreq); 1761 } 1762 1763 BRIDGE_UNLOCK(sc); 1764 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1765 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1766 BRIDGE_LOCK(sc); 1767 free(outbuf, M_TEMP); 1768 return (error); 1769 } 1770 1771 static int 1772 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1773 { 1774 struct ifbrparam *param = arg; 1775 1776 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1777 } 1778 1779 static int 1780 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1781 { 1782 struct ifbrparam *param = arg; 1783 1784 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1785 } 1786 1787 /* 1788 * bridge_ifdetach: 1789 * 1790 * Detach an interface from a bridge. Called when a member 1791 * interface is detaching. 1792 */ 1793 static void 1794 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1795 { 1796 struct bridge_softc *sc = ifp->if_bridge; 1797 struct bridge_iflist *bif; 1798 1799 if (ifp->if_flags & IFF_RENAMING) 1800 return; 1801 if (V_bridge_cloner == NULL) { 1802 /* 1803 * This detach handler can be called after 1804 * vnet_bridge_uninit(). Just return in that case. 1805 */ 1806 return; 1807 } 1808 /* Check if the interface is a bridge member */ 1809 if (sc != NULL) { 1810 BRIDGE_LOCK(sc); 1811 1812 bif = bridge_lookup_member_if(sc, ifp); 1813 if (bif != NULL) 1814 bridge_delete_member(sc, bif, 1); 1815 1816 BRIDGE_UNLOCK(sc); 1817 return; 1818 } 1819 1820 /* Check if the interface is a span port */ 1821 BRIDGE_LIST_LOCK(); 1822 LIST_FOREACH(sc, &V_bridge_list, sc_list) { 1823 BRIDGE_LOCK(sc); 1824 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1825 if (ifp == bif->bif_ifp) { 1826 bridge_delete_span(sc, bif); 1827 break; 1828 } 1829 1830 BRIDGE_UNLOCK(sc); 1831 } 1832 BRIDGE_LIST_UNLOCK(); 1833 } 1834 1835 /* 1836 * bridge_init: 1837 * 1838 * Initialize a bridge interface. 1839 */ 1840 static void 1841 bridge_init(void *xsc) 1842 { 1843 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1844 struct ifnet *ifp = sc->sc_ifp; 1845 1846 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1847 return; 1848 1849 BRIDGE_LOCK(sc); 1850 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1851 bridge_timer, sc); 1852 1853 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1854 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1855 1856 BRIDGE_UNLOCK(sc); 1857 } 1858 1859 /* 1860 * bridge_stop: 1861 * 1862 * Stop the bridge interface. 1863 */ 1864 static void 1865 bridge_stop(struct ifnet *ifp, int disable) 1866 { 1867 struct bridge_softc *sc = ifp->if_softc; 1868 1869 BRIDGE_LOCK_ASSERT(sc); 1870 1871 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1872 return; 1873 1874 callout_stop(&sc->sc_brcallout); 1875 bstp_stop(&sc->sc_stp); 1876 1877 bridge_rtflush(sc, IFBF_FLUSHDYN); 1878 1879 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1880 } 1881 1882 /* 1883 * bridge_enqueue: 1884 * 1885 * Enqueue a packet on a bridge member interface. 1886 * 1887 */ 1888 static int 1889 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1890 { 1891 int len, err = 0; 1892 short mflags; 1893 struct mbuf *m0; 1894 1895 /* We may be sending a fragment so traverse the mbuf */ 1896 for (; m; m = m0) { 1897 m0 = m->m_nextpkt; 1898 m->m_nextpkt = NULL; 1899 len = m->m_pkthdr.len; 1900 mflags = m->m_flags; 1901 1902 /* 1903 * If underlying interface can not do VLAN tag insertion itself 1904 * then attach a packet tag that holds it. 1905 */ 1906 if ((m->m_flags & M_VLANTAG) && 1907 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1908 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1909 if (m == NULL) { 1910 if_printf(dst_ifp, 1911 "unable to prepend VLAN header\n"); 1912 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1); 1913 continue; 1914 } 1915 m->m_flags &= ~M_VLANTAG; 1916 } 1917 1918 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 1919 m_freem(m0); 1920 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 1921 break; 1922 } 1923 1924 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1); 1925 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len); 1926 if (mflags & M_MCAST) 1927 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1); 1928 } 1929 1930 return (err); 1931 } 1932 1933 /* 1934 * bridge_dummynet: 1935 * 1936 * Receive a queued packet from dummynet and pass it on to the output 1937 * interface. 1938 * 1939 * The mbuf has the Ethernet header already attached. 1940 */ 1941 static void 1942 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1943 { 1944 struct bridge_softc *sc; 1945 1946 sc = ifp->if_bridge; 1947 1948 /* 1949 * The packet didnt originate from a member interface. This should only 1950 * ever happen if a member interface is removed while packets are 1951 * queued for it. 1952 */ 1953 if (sc == NULL) { 1954 m_freem(m); 1955 return; 1956 } 1957 1958 if (PFIL_HOOKED(&V_inet_pfil_hook) 1959 #ifdef INET6 1960 || PFIL_HOOKED(&V_inet6_pfil_hook) 1961 #endif 1962 ) { 1963 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1964 return; 1965 if (m == NULL) 1966 return; 1967 } 1968 1969 bridge_enqueue(sc, ifp, m); 1970 } 1971 1972 /* 1973 * bridge_output: 1974 * 1975 * Send output from a bridge member interface. This 1976 * performs the bridging function for locally originated 1977 * packets. 1978 * 1979 * The mbuf has the Ethernet header already attached. We must 1980 * enqueue or free the mbuf before returning. 1981 */ 1982 static int 1983 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1984 struct rtentry *rt) 1985 { 1986 struct ether_header *eh; 1987 struct ifnet *dst_if; 1988 struct bridge_softc *sc; 1989 uint16_t vlan; 1990 1991 if (m->m_len < ETHER_HDR_LEN) { 1992 m = m_pullup(m, ETHER_HDR_LEN); 1993 if (m == NULL) 1994 return (0); 1995 } 1996 1997 eh = mtod(m, struct ether_header *); 1998 sc = ifp->if_bridge; 1999 vlan = VLANTAGOF(m); 2000 2001 BRIDGE_LOCK(sc); 2002 2003 /* 2004 * If bridge is down, but the original output interface is up, 2005 * go ahead and send out that interface. Otherwise, the packet 2006 * is dropped below. 2007 */ 2008 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2009 dst_if = ifp; 2010 goto sendunicast; 2011 } 2012 2013 /* 2014 * If the packet is a multicast, or we don't know a better way to 2015 * get there, send to all interfaces. 2016 */ 2017 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 2018 dst_if = NULL; 2019 else 2020 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 2021 if (dst_if == NULL) { 2022 struct bridge_iflist *bif; 2023 struct mbuf *mc; 2024 int error = 0, used = 0; 2025 2026 bridge_span(sc, m); 2027 2028 BRIDGE_LOCK2REF(sc, error); 2029 if (error) { 2030 m_freem(m); 2031 return (0); 2032 } 2033 2034 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2035 dst_if = bif->bif_ifp; 2036 2037 if (dst_if->if_type == IFT_GIF) 2038 continue; 2039 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2040 continue; 2041 2042 /* 2043 * If this is not the original output interface, 2044 * and the interface is participating in spanning 2045 * tree, make sure the port is in a state that 2046 * allows forwarding. 2047 */ 2048 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 2049 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2050 continue; 2051 2052 if (LIST_NEXT(bif, bif_next) == NULL) { 2053 used = 1; 2054 mc = m; 2055 } else { 2056 mc = m_copypacket(m, M_NOWAIT); 2057 if (mc == NULL) { 2058 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2059 continue; 2060 } 2061 } 2062 2063 bridge_enqueue(sc, dst_if, mc); 2064 } 2065 if (used == 0) 2066 m_freem(m); 2067 BRIDGE_UNREF(sc); 2068 return (0); 2069 } 2070 2071 sendunicast: 2072 /* 2073 * XXX Spanning tree consideration here? 2074 */ 2075 2076 bridge_span(sc, m); 2077 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2078 m_freem(m); 2079 BRIDGE_UNLOCK(sc); 2080 return (0); 2081 } 2082 2083 BRIDGE_UNLOCK(sc); 2084 bridge_enqueue(sc, dst_if, m); 2085 return (0); 2086 } 2087 2088 /* 2089 * bridge_transmit: 2090 * 2091 * Do output on a bridge. 2092 * 2093 */ 2094 static int 2095 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2096 { 2097 struct bridge_softc *sc; 2098 struct ether_header *eh; 2099 struct ifnet *dst_if; 2100 int error = 0; 2101 2102 sc = ifp->if_softc; 2103 2104 ETHER_BPF_MTAP(ifp, m); 2105 2106 eh = mtod(m, struct ether_header *); 2107 2108 BRIDGE_LOCK(sc); 2109 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2110 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) { 2111 BRIDGE_UNLOCK(sc); 2112 error = bridge_enqueue(sc, dst_if, m); 2113 } else 2114 bridge_broadcast(sc, ifp, m, 0); 2115 2116 return (error); 2117 } 2118 2119 /* 2120 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2121 */ 2122 static void 2123 bridge_qflush(struct ifnet *ifp __unused) 2124 { 2125 } 2126 2127 /* 2128 * bridge_forward: 2129 * 2130 * The forwarding function of the bridge. 2131 * 2132 * NOTE: Releases the lock on return. 2133 */ 2134 static void 2135 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2136 struct mbuf *m) 2137 { 2138 struct bridge_iflist *dbif; 2139 struct ifnet *src_if, *dst_if, *ifp; 2140 struct ether_header *eh; 2141 uint16_t vlan; 2142 uint8_t *dst; 2143 int error; 2144 2145 src_if = m->m_pkthdr.rcvif; 2146 ifp = sc->sc_ifp; 2147 2148 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 2149 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2150 vlan = VLANTAGOF(m); 2151 2152 if ((sbif->bif_flags & IFBIF_STP) && 2153 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2154 goto drop; 2155 2156 eh = mtod(m, struct ether_header *); 2157 dst = eh->ether_dhost; 2158 2159 /* If the interface is learning, record the address. */ 2160 if (sbif->bif_flags & IFBIF_LEARNING) { 2161 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2162 sbif, 0, IFBAF_DYNAMIC); 2163 /* 2164 * If the interface has addresses limits then deny any source 2165 * that is not in the cache. 2166 */ 2167 if (error && sbif->bif_addrmax) 2168 goto drop; 2169 } 2170 2171 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2172 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2173 goto drop; 2174 2175 /* 2176 * At this point, the port either doesn't participate 2177 * in spanning tree or it is in the forwarding state. 2178 */ 2179 2180 /* 2181 * If the packet is unicast, destined for someone on 2182 * "this" side of the bridge, drop it. 2183 */ 2184 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2185 dst_if = bridge_rtlookup(sc, dst, vlan); 2186 if (src_if == dst_if) 2187 goto drop; 2188 } else { 2189 /* 2190 * Check if its a reserved multicast address, any address 2191 * listed in 802.1D section 7.12.6 may not be forwarded by the 2192 * bridge. 2193 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2194 */ 2195 if (dst[0] == 0x01 && dst[1] == 0x80 && 2196 dst[2] == 0xc2 && dst[3] == 0x00 && 2197 dst[4] == 0x00 && dst[5] <= 0x0f) 2198 goto drop; 2199 2200 /* ...forward it to all interfaces. */ 2201 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 2202 dst_if = NULL; 2203 } 2204 2205 /* 2206 * If we have a destination interface which is a member of our bridge, 2207 * OR this is a unicast packet, push it through the bpf(4) machinery. 2208 * For broadcast or multicast packets, don't bother because it will 2209 * be reinjected into ether_input. We do this before we pass the packets 2210 * through the pfil(9) framework, as it is possible that pfil(9) will 2211 * drop the packet, or possibly modify it, making it difficult to debug 2212 * firewall issues on the bridge. 2213 */ 2214 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2215 ETHER_BPF_MTAP(ifp, m); 2216 2217 /* run the packet filter */ 2218 if (PFIL_HOOKED(&V_inet_pfil_hook) 2219 #ifdef INET6 2220 || PFIL_HOOKED(&V_inet6_pfil_hook) 2221 #endif 2222 ) { 2223 BRIDGE_UNLOCK(sc); 2224 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2225 return; 2226 if (m == NULL) 2227 return; 2228 BRIDGE_LOCK(sc); 2229 } 2230 2231 if (dst_if == NULL) { 2232 bridge_broadcast(sc, src_if, m, 1); 2233 return; 2234 } 2235 2236 /* 2237 * At this point, we're dealing with a unicast frame 2238 * going to a different interface. 2239 */ 2240 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2241 goto drop; 2242 2243 dbif = bridge_lookup_member_if(sc, dst_if); 2244 if (dbif == NULL) 2245 /* Not a member of the bridge (anymore?) */ 2246 goto drop; 2247 2248 /* Private segments can not talk to each other */ 2249 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2250 goto drop; 2251 2252 if ((dbif->bif_flags & IFBIF_STP) && 2253 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2254 goto drop; 2255 2256 BRIDGE_UNLOCK(sc); 2257 2258 if (PFIL_HOOKED(&V_inet_pfil_hook) 2259 #ifdef INET6 2260 || PFIL_HOOKED(&V_inet6_pfil_hook) 2261 #endif 2262 ) { 2263 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2264 return; 2265 if (m == NULL) 2266 return; 2267 } 2268 2269 bridge_enqueue(sc, dst_if, m); 2270 return; 2271 2272 drop: 2273 BRIDGE_UNLOCK(sc); 2274 m_freem(m); 2275 } 2276 2277 /* 2278 * bridge_input: 2279 * 2280 * Receive input from a member interface. Queue the packet for 2281 * bridging if it is not for us. 2282 */ 2283 static struct mbuf * 2284 bridge_input(struct ifnet *ifp, struct mbuf *m) 2285 { 2286 struct bridge_softc *sc = ifp->if_bridge; 2287 struct bridge_iflist *bif, *bif2; 2288 struct ifnet *bifp; 2289 struct ether_header *eh; 2290 struct mbuf *mc, *mc2; 2291 uint16_t vlan; 2292 int error; 2293 2294 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2295 return (m); 2296 2297 bifp = sc->sc_ifp; 2298 vlan = VLANTAGOF(m); 2299 2300 /* 2301 * Implement support for bridge monitoring. If this flag has been 2302 * set on this interface, discard the packet once we push it through 2303 * the bpf(4) machinery, but before we do, increment the byte and 2304 * packet counters associated with this interface. 2305 */ 2306 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2307 m->m_pkthdr.rcvif = bifp; 2308 ETHER_BPF_MTAP(bifp, m); 2309 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); 2310 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2311 m_freem(m); 2312 return (NULL); 2313 } 2314 BRIDGE_LOCK(sc); 2315 bif = bridge_lookup_member_if(sc, ifp); 2316 if (bif == NULL) { 2317 BRIDGE_UNLOCK(sc); 2318 return (m); 2319 } 2320 2321 eh = mtod(m, struct ether_header *); 2322 2323 bridge_span(sc, m); 2324 2325 if (m->m_flags & (M_BCAST|M_MCAST)) { 2326 /* Tap off 802.1D packets; they do not get forwarded. */ 2327 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2328 ETHER_ADDR_LEN) == 0) { 2329 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2330 BRIDGE_UNLOCK(sc); 2331 return (NULL); 2332 } 2333 2334 if ((bif->bif_flags & IFBIF_STP) && 2335 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2336 BRIDGE_UNLOCK(sc); 2337 return (m); 2338 } 2339 2340 /* 2341 * Make a deep copy of the packet and enqueue the copy 2342 * for bridge processing; return the original packet for 2343 * local processing. 2344 */ 2345 mc = m_dup(m, M_NOWAIT); 2346 if (mc == NULL) { 2347 BRIDGE_UNLOCK(sc); 2348 return (m); 2349 } 2350 2351 /* Perform the bridge forwarding function with the copy. */ 2352 bridge_forward(sc, bif, mc); 2353 2354 /* 2355 * Reinject the mbuf as arriving on the bridge so we have a 2356 * chance at claiming multicast packets. We can not loop back 2357 * here from ether_input as a bridge is never a member of a 2358 * bridge. 2359 */ 2360 KASSERT(bifp->if_bridge == NULL, 2361 ("loop created in bridge_input")); 2362 mc2 = m_dup(m, M_NOWAIT); 2363 if (mc2 != NULL) { 2364 /* Keep the layer3 header aligned */ 2365 int i = min(mc2->m_pkthdr.len, max_protohdr); 2366 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2367 } 2368 if (mc2 != NULL) { 2369 mc2->m_pkthdr.rcvif = bifp; 2370 (*bifp->if_input)(bifp, mc2); 2371 } 2372 2373 /* Return the original packet for local processing. */ 2374 return (m); 2375 } 2376 2377 if ((bif->bif_flags & IFBIF_STP) && 2378 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2379 BRIDGE_UNLOCK(sc); 2380 return (m); 2381 } 2382 2383 #if (defined(INET) || defined(INET6)) 2384 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2385 || ((iface)->if_carp \ 2386 && (*carp_forus_p)((iface), eh->ether_dhost)) 2387 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2388 || ((iface)->if_carp \ 2389 && (*carp_forus_p)((iface), eh->ether_shost)) 2390 #else 2391 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2392 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2393 #endif 2394 2395 #ifdef INET6 2396 # define OR_PFIL_HOOKED_INET6 \ 2397 || PFIL_HOOKED(&V_inet6_pfil_hook) 2398 #else 2399 # define OR_PFIL_HOOKED_INET6 2400 #endif 2401 2402 #define GRAB_OUR_PACKETS(iface) \ 2403 if ((iface)->if_type == IFT_GIF) \ 2404 continue; \ 2405 /* It is destined for us. */ \ 2406 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2407 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2408 ) { \ 2409 if ((iface)->if_type == IFT_BRIDGE) { \ 2410 ETHER_BPF_MTAP(iface, m); \ 2411 if_inc_counter(iface, IFCOUNTER_IPACKETS, 1); \ 2412 if_inc_counter(iface, IFCOUNTER_IBYTES, m->m_pkthdr.len); \ 2413 /* Filter on the physical interface. */ \ 2414 if (V_pfil_local_phys && \ 2415 (PFIL_HOOKED(&V_inet_pfil_hook) \ 2416 OR_PFIL_HOOKED_INET6)) { \ 2417 if (bridge_pfil(&m, NULL, ifp, \ 2418 PFIL_IN) != 0 || m == NULL) { \ 2419 BRIDGE_UNLOCK(sc); \ 2420 return (NULL); \ 2421 } \ 2422 eh = mtod(m, struct ether_header *); \ 2423 } \ 2424 } \ 2425 if (bif->bif_flags & IFBIF_LEARNING) { \ 2426 error = bridge_rtupdate(sc, eh->ether_shost, \ 2427 vlan, bif, 0, IFBAF_DYNAMIC); \ 2428 if (error && bif->bif_addrmax) { \ 2429 BRIDGE_UNLOCK(sc); \ 2430 m_freem(m); \ 2431 return (NULL); \ 2432 } \ 2433 } \ 2434 m->m_pkthdr.rcvif = iface; \ 2435 BRIDGE_UNLOCK(sc); \ 2436 return (m); \ 2437 } \ 2438 \ 2439 /* We just received a packet that we sent out. */ \ 2440 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2441 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2442 ) { \ 2443 BRIDGE_UNLOCK(sc); \ 2444 m_freem(m); \ 2445 return (NULL); \ 2446 } 2447 2448 /* 2449 * Unicast. Make sure it's not for the bridge. 2450 */ 2451 do { GRAB_OUR_PACKETS(bifp) } while (0); 2452 2453 /* 2454 * Give a chance for ifp at first priority. This will help when the 2455 * packet comes through the interface like VLAN's with the same MACs 2456 * on several interfaces from the same bridge. This also will save 2457 * some CPU cycles in case the destination interface and the input 2458 * interface (eq ifp) are the same. 2459 */ 2460 do { GRAB_OUR_PACKETS(ifp) } while (0); 2461 2462 /* Now check the all bridge members. */ 2463 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2464 GRAB_OUR_PACKETS(bif2->bif_ifp) 2465 } 2466 2467 #undef OR_CARP_CHECK_WE_ARE_DST 2468 #undef OR_CARP_CHECK_WE_ARE_SRC 2469 #undef OR_PFIL_HOOKED_INET6 2470 #undef GRAB_OUR_PACKETS 2471 2472 /* Perform the bridge forwarding function. */ 2473 bridge_forward(sc, bif, m); 2474 2475 return (NULL); 2476 } 2477 2478 /* 2479 * bridge_broadcast: 2480 * 2481 * Send a frame to all interfaces that are members of 2482 * the bridge, except for the one on which the packet 2483 * arrived. 2484 * 2485 * NOTE: Releases the lock on return. 2486 */ 2487 static void 2488 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2489 struct mbuf *m, int runfilt) 2490 { 2491 struct bridge_iflist *dbif, *sbif; 2492 struct mbuf *mc; 2493 struct ifnet *dst_if; 2494 int error = 0, used = 0, i; 2495 2496 sbif = bridge_lookup_member_if(sc, src_if); 2497 2498 BRIDGE_LOCK2REF(sc, error); 2499 if (error) { 2500 m_freem(m); 2501 return; 2502 } 2503 2504 /* Filter on the bridge interface before broadcasting */ 2505 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2506 #ifdef INET6 2507 || PFIL_HOOKED(&V_inet6_pfil_hook) 2508 #endif 2509 )) { 2510 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2511 goto out; 2512 if (m == NULL) 2513 goto out; 2514 } 2515 2516 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2517 dst_if = dbif->bif_ifp; 2518 if (dst_if == src_if) 2519 continue; 2520 2521 /* Private segments can not talk to each other */ 2522 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2523 continue; 2524 2525 if ((dbif->bif_flags & IFBIF_STP) && 2526 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2527 continue; 2528 2529 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2530 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2531 continue; 2532 2533 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2534 continue; 2535 2536 if (LIST_NEXT(dbif, bif_next) == NULL) { 2537 mc = m; 2538 used = 1; 2539 } else { 2540 mc = m_dup(m, M_NOWAIT); 2541 if (mc == NULL) { 2542 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2543 continue; 2544 } 2545 } 2546 2547 /* 2548 * Filter on the output interface. Pass a NULL bridge interface 2549 * pointer so we do not redundantly filter on the bridge for 2550 * each interface we broadcast on. 2551 */ 2552 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2553 #ifdef INET6 2554 || PFIL_HOOKED(&V_inet6_pfil_hook) 2555 #endif 2556 )) { 2557 if (used == 0) { 2558 /* Keep the layer3 header aligned */ 2559 i = min(mc->m_pkthdr.len, max_protohdr); 2560 mc = m_copyup(mc, i, ETHER_ALIGN); 2561 if (mc == NULL) { 2562 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2563 continue; 2564 } 2565 } 2566 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2567 continue; 2568 if (mc == NULL) 2569 continue; 2570 } 2571 2572 bridge_enqueue(sc, dst_if, mc); 2573 } 2574 if (used == 0) 2575 m_freem(m); 2576 2577 out: 2578 BRIDGE_UNREF(sc); 2579 } 2580 2581 /* 2582 * bridge_span: 2583 * 2584 * Duplicate a packet out one or more interfaces that are in span mode, 2585 * the original mbuf is unmodified. 2586 */ 2587 static void 2588 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2589 { 2590 struct bridge_iflist *bif; 2591 struct ifnet *dst_if; 2592 struct mbuf *mc; 2593 2594 if (LIST_EMPTY(&sc->sc_spanlist)) 2595 return; 2596 2597 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2598 dst_if = bif->bif_ifp; 2599 2600 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2601 continue; 2602 2603 mc = m_copypacket(m, M_NOWAIT); 2604 if (mc == NULL) { 2605 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2606 continue; 2607 } 2608 2609 bridge_enqueue(sc, dst_if, mc); 2610 } 2611 } 2612 2613 /* 2614 * bridge_rtupdate: 2615 * 2616 * Add a bridge routing entry. 2617 */ 2618 static int 2619 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2620 struct bridge_iflist *bif, int setflags, uint8_t flags) 2621 { 2622 struct bridge_rtnode *brt; 2623 int error; 2624 2625 BRIDGE_LOCK_ASSERT(sc); 2626 2627 /* Check the source address is valid and not multicast. */ 2628 if (ETHER_IS_MULTICAST(dst) || 2629 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2630 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2631 return (EINVAL); 2632 2633 /* 802.1p frames map to vlan 1 */ 2634 if (vlan == 0) 2635 vlan = 1; 2636 2637 /* 2638 * A route for this destination might already exist. If so, 2639 * update it, otherwise create a new one. 2640 */ 2641 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2642 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2643 sc->sc_brtexceeded++; 2644 return (ENOSPC); 2645 } 2646 /* Check per interface address limits (if enabled) */ 2647 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2648 bif->bif_addrexceeded++; 2649 return (ENOSPC); 2650 } 2651 2652 /* 2653 * Allocate a new bridge forwarding node, and 2654 * initialize the expiration time and Ethernet 2655 * address. 2656 */ 2657 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2658 if (brt == NULL) 2659 return (ENOMEM); 2660 2661 if (bif->bif_flags & IFBIF_STICKY) 2662 brt->brt_flags = IFBAF_STICKY; 2663 else 2664 brt->brt_flags = IFBAF_DYNAMIC; 2665 2666 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2667 brt->brt_vlan = vlan; 2668 2669 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2670 uma_zfree(bridge_rtnode_zone, brt); 2671 return (error); 2672 } 2673 brt->brt_dst = bif; 2674 bif->bif_addrcnt++; 2675 } 2676 2677 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2678 brt->brt_dst != bif) { 2679 brt->brt_dst->bif_addrcnt--; 2680 brt->brt_dst = bif; 2681 brt->brt_dst->bif_addrcnt++; 2682 } 2683 2684 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2685 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2686 if (setflags) 2687 brt->brt_flags = flags; 2688 2689 return (0); 2690 } 2691 2692 /* 2693 * bridge_rtlookup: 2694 * 2695 * Lookup the destination interface for an address. 2696 */ 2697 static struct ifnet * 2698 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2699 { 2700 struct bridge_rtnode *brt; 2701 2702 BRIDGE_LOCK_ASSERT(sc); 2703 2704 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2705 return (NULL); 2706 2707 return (brt->brt_ifp); 2708 } 2709 2710 /* 2711 * bridge_rttrim: 2712 * 2713 * Trim the routine table so that we have a number 2714 * of routing entries less than or equal to the 2715 * maximum number. 2716 */ 2717 static void 2718 bridge_rttrim(struct bridge_softc *sc) 2719 { 2720 struct bridge_rtnode *brt, *nbrt; 2721 2722 BRIDGE_LOCK_ASSERT(sc); 2723 2724 /* Make sure we actually need to do this. */ 2725 if (sc->sc_brtcnt <= sc->sc_brtmax) 2726 return; 2727 2728 /* Force an aging cycle; this might trim enough addresses. */ 2729 bridge_rtage(sc); 2730 if (sc->sc_brtcnt <= sc->sc_brtmax) 2731 return; 2732 2733 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2734 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2735 bridge_rtnode_destroy(sc, brt); 2736 if (sc->sc_brtcnt <= sc->sc_brtmax) 2737 return; 2738 } 2739 } 2740 } 2741 2742 /* 2743 * bridge_timer: 2744 * 2745 * Aging timer for the bridge. 2746 */ 2747 static void 2748 bridge_timer(void *arg) 2749 { 2750 struct bridge_softc *sc = arg; 2751 2752 BRIDGE_LOCK_ASSERT(sc); 2753 2754 bridge_rtage(sc); 2755 2756 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2757 callout_reset(&sc->sc_brcallout, 2758 bridge_rtable_prune_period * hz, bridge_timer, sc); 2759 } 2760 2761 /* 2762 * bridge_rtage: 2763 * 2764 * Perform an aging cycle. 2765 */ 2766 static void 2767 bridge_rtage(struct bridge_softc *sc) 2768 { 2769 struct bridge_rtnode *brt, *nbrt; 2770 2771 BRIDGE_LOCK_ASSERT(sc); 2772 2773 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2774 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2775 if (time_uptime >= brt->brt_expire) 2776 bridge_rtnode_destroy(sc, brt); 2777 } 2778 } 2779 } 2780 2781 /* 2782 * bridge_rtflush: 2783 * 2784 * Remove all dynamic addresses from the bridge. 2785 */ 2786 static void 2787 bridge_rtflush(struct bridge_softc *sc, int full) 2788 { 2789 struct bridge_rtnode *brt, *nbrt; 2790 2791 BRIDGE_LOCK_ASSERT(sc); 2792 2793 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2794 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2795 bridge_rtnode_destroy(sc, brt); 2796 } 2797 } 2798 2799 /* 2800 * bridge_rtdaddr: 2801 * 2802 * Remove an address from the table. 2803 */ 2804 static int 2805 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2806 { 2807 struct bridge_rtnode *brt; 2808 int found = 0; 2809 2810 BRIDGE_LOCK_ASSERT(sc); 2811 2812 /* 2813 * If vlan is zero then we want to delete for all vlans so the lookup 2814 * may return more than one. 2815 */ 2816 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2817 bridge_rtnode_destroy(sc, brt); 2818 found = 1; 2819 } 2820 2821 return (found ? 0 : ENOENT); 2822 } 2823 2824 /* 2825 * bridge_rtdelete: 2826 * 2827 * Delete routes to a speicifc member interface. 2828 */ 2829 static void 2830 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2831 { 2832 struct bridge_rtnode *brt, *nbrt; 2833 2834 BRIDGE_LOCK_ASSERT(sc); 2835 2836 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2837 if (brt->brt_ifp == ifp && (full || 2838 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2839 bridge_rtnode_destroy(sc, brt); 2840 } 2841 } 2842 2843 /* 2844 * bridge_rtable_init: 2845 * 2846 * Initialize the route table for this bridge. 2847 */ 2848 static void 2849 bridge_rtable_init(struct bridge_softc *sc) 2850 { 2851 int i; 2852 2853 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2854 M_DEVBUF, M_WAITOK); 2855 2856 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2857 LIST_INIT(&sc->sc_rthash[i]); 2858 2859 sc->sc_rthash_key = arc4random(); 2860 LIST_INIT(&sc->sc_rtlist); 2861 } 2862 2863 /* 2864 * bridge_rtable_fini: 2865 * 2866 * Deconstruct the route table for this bridge. 2867 */ 2868 static void 2869 bridge_rtable_fini(struct bridge_softc *sc) 2870 { 2871 2872 KASSERT(sc->sc_brtcnt == 0, 2873 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2874 free(sc->sc_rthash, M_DEVBUF); 2875 } 2876 2877 /* 2878 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2879 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2880 */ 2881 #define mix(a, b, c) \ 2882 do { \ 2883 a -= b; a -= c; a ^= (c >> 13); \ 2884 b -= c; b -= a; b ^= (a << 8); \ 2885 c -= a; c -= b; c ^= (b >> 13); \ 2886 a -= b; a -= c; a ^= (c >> 12); \ 2887 b -= c; b -= a; b ^= (a << 16); \ 2888 c -= a; c -= b; c ^= (b >> 5); \ 2889 a -= b; a -= c; a ^= (c >> 3); \ 2890 b -= c; b -= a; b ^= (a << 10); \ 2891 c -= a; c -= b; c ^= (b >> 15); \ 2892 } while (/*CONSTCOND*/0) 2893 2894 static __inline uint32_t 2895 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2896 { 2897 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2898 2899 b += addr[5] << 8; 2900 b += addr[4]; 2901 a += addr[3] << 24; 2902 a += addr[2] << 16; 2903 a += addr[1] << 8; 2904 a += addr[0]; 2905 2906 mix(a, b, c); 2907 2908 return (c & BRIDGE_RTHASH_MASK); 2909 } 2910 2911 #undef mix 2912 2913 static int 2914 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2915 { 2916 int i, d; 2917 2918 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2919 d = ((int)a[i]) - ((int)b[i]); 2920 } 2921 2922 return (d); 2923 } 2924 2925 /* 2926 * bridge_rtnode_lookup: 2927 * 2928 * Look up a bridge route node for the specified destination. Compare the 2929 * vlan id or if zero then just return the first match. 2930 */ 2931 static struct bridge_rtnode * 2932 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2933 { 2934 struct bridge_rtnode *brt; 2935 uint32_t hash; 2936 int dir; 2937 2938 BRIDGE_LOCK_ASSERT(sc); 2939 2940 hash = bridge_rthash(sc, addr); 2941 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2942 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2943 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2944 return (brt); 2945 if (dir > 0) 2946 return (NULL); 2947 } 2948 2949 return (NULL); 2950 } 2951 2952 /* 2953 * bridge_rtnode_insert: 2954 * 2955 * Insert the specified bridge node into the route table. We 2956 * assume the entry is not already in the table. 2957 */ 2958 static int 2959 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2960 { 2961 struct bridge_rtnode *lbrt; 2962 uint32_t hash; 2963 int dir; 2964 2965 BRIDGE_LOCK_ASSERT(sc); 2966 2967 hash = bridge_rthash(sc, brt->brt_addr); 2968 2969 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2970 if (lbrt == NULL) { 2971 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2972 goto out; 2973 } 2974 2975 do { 2976 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2977 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2978 return (EEXIST); 2979 if (dir > 0) { 2980 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2981 goto out; 2982 } 2983 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2984 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2985 goto out; 2986 } 2987 lbrt = LIST_NEXT(lbrt, brt_hash); 2988 } while (lbrt != NULL); 2989 2990 #ifdef DIAGNOSTIC 2991 panic("bridge_rtnode_insert: impossible"); 2992 #endif 2993 2994 out: 2995 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2996 sc->sc_brtcnt++; 2997 2998 return (0); 2999 } 3000 3001 /* 3002 * bridge_rtnode_destroy: 3003 * 3004 * Destroy a bridge rtnode. 3005 */ 3006 static void 3007 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 3008 { 3009 BRIDGE_LOCK_ASSERT(sc); 3010 3011 LIST_REMOVE(brt, brt_hash); 3012 3013 LIST_REMOVE(brt, brt_list); 3014 sc->sc_brtcnt--; 3015 brt->brt_dst->bif_addrcnt--; 3016 uma_zfree(bridge_rtnode_zone, brt); 3017 } 3018 3019 /* 3020 * bridge_rtable_expire: 3021 * 3022 * Set the expiry time for all routes on an interface. 3023 */ 3024 static void 3025 bridge_rtable_expire(struct ifnet *ifp, int age) 3026 { 3027 struct bridge_softc *sc = ifp->if_bridge; 3028 struct bridge_rtnode *brt; 3029 3030 BRIDGE_LOCK(sc); 3031 3032 /* 3033 * If the age is zero then flush, otherwise set all the expiry times to 3034 * age for the interface 3035 */ 3036 if (age == 0) 3037 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 3038 else { 3039 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 3040 /* Cap the expiry time to 'age' */ 3041 if (brt->brt_ifp == ifp && 3042 brt->brt_expire > time_uptime + age && 3043 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3044 brt->brt_expire = time_uptime + age; 3045 } 3046 } 3047 BRIDGE_UNLOCK(sc); 3048 } 3049 3050 /* 3051 * bridge_state_change: 3052 * 3053 * Callback from the bridgestp code when a port changes states. 3054 */ 3055 static void 3056 bridge_state_change(struct ifnet *ifp, int state) 3057 { 3058 struct bridge_softc *sc = ifp->if_bridge; 3059 static const char *stpstates[] = { 3060 "disabled", 3061 "listening", 3062 "learning", 3063 "forwarding", 3064 "blocking", 3065 "discarding" 3066 }; 3067 3068 if (V_log_stp) 3069 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3070 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3071 } 3072 3073 /* 3074 * Send bridge packets through pfil if they are one of the types pfil can deal 3075 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3076 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3077 * that interface. 3078 */ 3079 static int 3080 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3081 { 3082 int snap, error, i, hlen; 3083 struct ether_header *eh1, eh2; 3084 struct ip *ip; 3085 struct llc llc1; 3086 u_int16_t ether_type; 3087 3088 snap = 0; 3089 error = -1; /* Default error if not error == 0 */ 3090 3091 #if 0 3092 /* we may return with the IP fields swapped, ensure its not shared */ 3093 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3094 #endif 3095 3096 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0) 3097 return (0); /* filtering is disabled */ 3098 3099 i = min((*mp)->m_pkthdr.len, max_protohdr); 3100 if ((*mp)->m_len < i) { 3101 *mp = m_pullup(*mp, i); 3102 if (*mp == NULL) { 3103 printf("%s: m_pullup failed\n", __func__); 3104 return (-1); 3105 } 3106 } 3107 3108 eh1 = mtod(*mp, struct ether_header *); 3109 ether_type = ntohs(eh1->ether_type); 3110 3111 /* 3112 * Check for SNAP/LLC. 3113 */ 3114 if (ether_type < ETHERMTU) { 3115 struct llc *llc2 = (struct llc *)(eh1 + 1); 3116 3117 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3118 llc2->llc_dsap == LLC_SNAP_LSAP && 3119 llc2->llc_ssap == LLC_SNAP_LSAP && 3120 llc2->llc_control == LLC_UI) { 3121 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3122 snap = 1; 3123 } 3124 } 3125 3126 /* 3127 * If we're trying to filter bridge traffic, don't look at anything 3128 * other than IP and ARP traffic. If the filter doesn't understand 3129 * IPv6, don't allow IPv6 through the bridge either. This is lame 3130 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3131 * but of course we don't have an AppleTalk filter to begin with. 3132 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3133 * ARP traffic.) 3134 */ 3135 switch (ether_type) { 3136 case ETHERTYPE_ARP: 3137 case ETHERTYPE_REVARP: 3138 if (V_pfil_ipfw_arp == 0) 3139 return (0); /* Automatically pass */ 3140 break; 3141 3142 case ETHERTYPE_IP: 3143 #ifdef INET6 3144 case ETHERTYPE_IPV6: 3145 #endif /* INET6 */ 3146 break; 3147 default: 3148 /* 3149 * Check to see if the user wants to pass non-ip 3150 * packets, these will not be checked by pfil(9) and 3151 * passed unconditionally so the default is to drop. 3152 */ 3153 if (V_pfil_onlyip) 3154 goto bad; 3155 } 3156 3157 /* Run the packet through pfil before stripping link headers */ 3158 if (PFIL_HOOKED(&V_link_pfil_hook) && V_pfil_ipfw != 0 && 3159 dir == PFIL_OUT && ifp != NULL) { 3160 3161 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL); 3162 3163 if (*mp == NULL || error != 0) /* packet consumed by filter */ 3164 return (error); 3165 } 3166 3167 /* Strip off the Ethernet header and keep a copy. */ 3168 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3169 m_adj(*mp, ETHER_HDR_LEN); 3170 3171 /* Strip off snap header, if present */ 3172 if (snap) { 3173 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3174 m_adj(*mp, sizeof(struct llc)); 3175 } 3176 3177 /* 3178 * Check the IP header for alignment and errors 3179 */ 3180 if (dir == PFIL_IN) { 3181 switch (ether_type) { 3182 case ETHERTYPE_IP: 3183 error = bridge_ip_checkbasic(mp); 3184 break; 3185 #ifdef INET6 3186 case ETHERTYPE_IPV6: 3187 error = bridge_ip6_checkbasic(mp); 3188 break; 3189 #endif /* INET6 */ 3190 default: 3191 error = 0; 3192 } 3193 if (error) 3194 goto bad; 3195 } 3196 3197 error = 0; 3198 3199 /* 3200 * Run the packet through pfil 3201 */ 3202 switch (ether_type) { 3203 case ETHERTYPE_IP: 3204 /* 3205 * Run pfil on the member interface and the bridge, both can 3206 * be skipped by clearing pfil_member or pfil_bridge. 3207 * 3208 * Keep the order: 3209 * in_if -> bridge_if -> out_if 3210 */ 3211 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3212 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3213 dir, NULL); 3214 3215 if (*mp == NULL || error != 0) /* filter may consume */ 3216 break; 3217 3218 if (V_pfil_member && ifp != NULL) 3219 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, 3220 dir, NULL); 3221 3222 if (*mp == NULL || error != 0) /* filter may consume */ 3223 break; 3224 3225 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL) 3226 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3227 dir, NULL); 3228 3229 if (*mp == NULL || error != 0) /* filter may consume */ 3230 break; 3231 3232 /* check if we need to fragment the packet */ 3233 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) { 3234 i = (*mp)->m_pkthdr.len; 3235 if (i > ifp->if_mtu) { 3236 error = bridge_fragment(ifp, *mp, &eh2, snap, 3237 &llc1); 3238 return (error); 3239 } 3240 } 3241 3242 /* Recalculate the ip checksum. */ 3243 ip = mtod(*mp, struct ip *); 3244 hlen = ip->ip_hl << 2; 3245 if (hlen < sizeof(struct ip)) 3246 goto bad; 3247 if (hlen > (*mp)->m_len) { 3248 if ((*mp = m_pullup(*mp, hlen)) == 0) 3249 goto bad; 3250 ip = mtod(*mp, struct ip *); 3251 if (ip == NULL) 3252 goto bad; 3253 } 3254 ip->ip_sum = 0; 3255 if (hlen == sizeof(struct ip)) 3256 ip->ip_sum = in_cksum_hdr(ip); 3257 else 3258 ip->ip_sum = in_cksum(*mp, hlen); 3259 3260 break; 3261 #ifdef INET6 3262 case ETHERTYPE_IPV6: 3263 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3264 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3265 dir, NULL); 3266 3267 if (*mp == NULL || error != 0) /* filter may consume */ 3268 break; 3269 3270 if (V_pfil_member && ifp != NULL) 3271 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp, 3272 dir, NULL); 3273 3274 if (*mp == NULL || error != 0) /* filter may consume */ 3275 break; 3276 3277 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL) 3278 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3279 dir, NULL); 3280 break; 3281 #endif 3282 default: 3283 error = 0; 3284 break; 3285 } 3286 3287 if (*mp == NULL) 3288 return (error); 3289 if (error != 0) 3290 goto bad; 3291 3292 error = -1; 3293 3294 /* 3295 * Finally, put everything back the way it was and return 3296 */ 3297 if (snap) { 3298 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 3299 if (*mp == NULL) 3300 return (error); 3301 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3302 } 3303 3304 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 3305 if (*mp == NULL) 3306 return (error); 3307 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3308 3309 return (0); 3310 3311 bad: 3312 m_freem(*mp); 3313 *mp = NULL; 3314 return (error); 3315 } 3316 3317 /* 3318 * Perform basic checks on header size since 3319 * pfil assumes ip_input has already processed 3320 * it for it. Cut-and-pasted from ip_input.c. 3321 * Given how simple the IPv6 version is, 3322 * does the IPv4 version really need to be 3323 * this complicated? 3324 * 3325 * XXX Should we update ipstat here, or not? 3326 * XXX Right now we update ipstat but not 3327 * XXX csum_counter. 3328 */ 3329 static int 3330 bridge_ip_checkbasic(struct mbuf **mp) 3331 { 3332 struct mbuf *m = *mp; 3333 struct ip *ip; 3334 int len, hlen; 3335 u_short sum; 3336 3337 if (*mp == NULL) 3338 return (-1); 3339 3340 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3341 if ((m = m_copyup(m, sizeof(struct ip), 3342 (max_linkhdr + 3) & ~3)) == NULL) { 3343 /* XXXJRT new stat, please */ 3344 KMOD_IPSTAT_INC(ips_toosmall); 3345 goto bad; 3346 } 3347 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3348 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3349 KMOD_IPSTAT_INC(ips_toosmall); 3350 goto bad; 3351 } 3352 } 3353 ip = mtod(m, struct ip *); 3354 if (ip == NULL) goto bad; 3355 3356 if (ip->ip_v != IPVERSION) { 3357 KMOD_IPSTAT_INC(ips_badvers); 3358 goto bad; 3359 } 3360 hlen = ip->ip_hl << 2; 3361 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3362 KMOD_IPSTAT_INC(ips_badhlen); 3363 goto bad; 3364 } 3365 if (hlen > m->m_len) { 3366 if ((m = m_pullup(m, hlen)) == 0) { 3367 KMOD_IPSTAT_INC(ips_badhlen); 3368 goto bad; 3369 } 3370 ip = mtod(m, struct ip *); 3371 if (ip == NULL) goto bad; 3372 } 3373 3374 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3375 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3376 } else { 3377 if (hlen == sizeof(struct ip)) { 3378 sum = in_cksum_hdr(ip); 3379 } else { 3380 sum = in_cksum(m, hlen); 3381 } 3382 } 3383 if (sum) { 3384 KMOD_IPSTAT_INC(ips_badsum); 3385 goto bad; 3386 } 3387 3388 /* Retrieve the packet length. */ 3389 len = ntohs(ip->ip_len); 3390 3391 /* 3392 * Check for additional length bogosity 3393 */ 3394 if (len < hlen) { 3395 KMOD_IPSTAT_INC(ips_badlen); 3396 goto bad; 3397 } 3398 3399 /* 3400 * Check that the amount of data in the buffers 3401 * is as at least much as the IP header would have us expect. 3402 * Drop packet if shorter than we expect. 3403 */ 3404 if (m->m_pkthdr.len < len) { 3405 KMOD_IPSTAT_INC(ips_tooshort); 3406 goto bad; 3407 } 3408 3409 /* Checks out, proceed */ 3410 *mp = m; 3411 return (0); 3412 3413 bad: 3414 *mp = m; 3415 return (-1); 3416 } 3417 3418 #ifdef INET6 3419 /* 3420 * Same as above, but for IPv6. 3421 * Cut-and-pasted from ip6_input.c. 3422 * XXX Should we update ip6stat, or not? 3423 */ 3424 static int 3425 bridge_ip6_checkbasic(struct mbuf **mp) 3426 { 3427 struct mbuf *m = *mp; 3428 struct ip6_hdr *ip6; 3429 3430 /* 3431 * If the IPv6 header is not aligned, slurp it up into a new 3432 * mbuf with space for link headers, in the event we forward 3433 * it. Otherwise, if it is aligned, make sure the entire base 3434 * IPv6 header is in the first mbuf of the chain. 3435 */ 3436 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3437 struct ifnet *inifp = m->m_pkthdr.rcvif; 3438 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3439 (max_linkhdr + 3) & ~3)) == NULL) { 3440 /* XXXJRT new stat, please */ 3441 IP6STAT_INC(ip6s_toosmall); 3442 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3443 goto bad; 3444 } 3445 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3446 struct ifnet *inifp = m->m_pkthdr.rcvif; 3447 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3448 IP6STAT_INC(ip6s_toosmall); 3449 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3450 goto bad; 3451 } 3452 } 3453 3454 ip6 = mtod(m, struct ip6_hdr *); 3455 3456 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3457 IP6STAT_INC(ip6s_badvers); 3458 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3459 goto bad; 3460 } 3461 3462 /* Checks out, proceed */ 3463 *mp = m; 3464 return (0); 3465 3466 bad: 3467 *mp = m; 3468 return (-1); 3469 } 3470 #endif /* INET6 */ 3471 3472 /* 3473 * bridge_fragment: 3474 * 3475 * Return a fragmented mbuf chain. 3476 */ 3477 static int 3478 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, 3479 int snap, struct llc *llc) 3480 { 3481 struct mbuf *m0; 3482 struct ip *ip; 3483 int error = -1; 3484 3485 if (m->m_len < sizeof(struct ip) && 3486 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3487 goto out; 3488 ip = mtod(m, struct ip *); 3489 3490 m->m_pkthdr.csum_flags |= CSUM_IP; 3491 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 3492 if (error) 3493 goto out; 3494 3495 /* walk the chain and re-add the Ethernet header */ 3496 for (m0 = m; m0; m0 = m0->m_nextpkt) { 3497 if (error == 0) { 3498 if (snap) { 3499 M_PREPEND(m0, sizeof(struct llc), M_NOWAIT); 3500 if (m0 == NULL) { 3501 error = ENOBUFS; 3502 continue; 3503 } 3504 bcopy(llc, mtod(m0, caddr_t), 3505 sizeof(struct llc)); 3506 } 3507 M_PREPEND(m0, ETHER_HDR_LEN, M_NOWAIT); 3508 if (m0 == NULL) { 3509 error = ENOBUFS; 3510 continue; 3511 } 3512 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); 3513 } else 3514 m_freem(m); 3515 } 3516 3517 if (error == 0) 3518 KMOD_IPSTAT_INC(ips_fragmented); 3519 3520 return (error); 3521 3522 out: 3523 if (m != NULL) 3524 m_freem(m); 3525 return (error); 3526 } 3527 3528 static void 3529 bridge_linkstate(struct ifnet *ifp) 3530 { 3531 struct bridge_softc *sc = ifp->if_bridge; 3532 struct bridge_iflist *bif; 3533 3534 BRIDGE_LOCK(sc); 3535 bif = bridge_lookup_member_if(sc, ifp); 3536 if (bif == NULL) { 3537 BRIDGE_UNLOCK(sc); 3538 return; 3539 } 3540 bridge_linkcheck(sc); 3541 BRIDGE_UNLOCK(sc); 3542 3543 bstp_linkstate(&bif->bif_stp); 3544 } 3545 3546 static void 3547 bridge_linkcheck(struct bridge_softc *sc) 3548 { 3549 struct bridge_iflist *bif; 3550 int new_link, hasls; 3551 3552 BRIDGE_LOCK_ASSERT(sc); 3553 new_link = LINK_STATE_DOWN; 3554 hasls = 0; 3555 /* Our link is considered up if at least one of our ports is active */ 3556 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3557 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3558 hasls++; 3559 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3560 new_link = LINK_STATE_UP; 3561 break; 3562 } 3563 } 3564 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3565 /* If no interfaces support link-state then we default to up */ 3566 new_link = LINK_STATE_UP; 3567 } 3568 if_link_state_change(sc->sc_ifp, new_link); 3569 } 3570