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 heterogeneous 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 IFCAP_TXCSUM_IPV6) 171 172 /* 173 * List of capabilities to strip 174 */ 175 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 176 177 /* 178 * Bridge interface list entry. 179 */ 180 struct bridge_iflist { 181 LIST_ENTRY(bridge_iflist) bif_next; 182 struct ifnet *bif_ifp; /* member if */ 183 struct bstp_port bif_stp; /* STP state */ 184 uint32_t bif_flags; /* member if flags */ 185 int bif_savedcaps; /* saved capabilities */ 186 uint32_t bif_addrmax; /* max # of addresses */ 187 uint32_t bif_addrcnt; /* cur. # of addresses */ 188 uint32_t bif_addrexceeded;/* # of address violations */ 189 }; 190 191 /* 192 * Bridge route node. 193 */ 194 struct bridge_rtnode { 195 LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 196 LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 197 struct bridge_iflist *brt_dst; /* destination if */ 198 unsigned long brt_expire; /* expiration time */ 199 uint8_t brt_flags; /* address flags */ 200 uint8_t brt_addr[ETHER_ADDR_LEN]; 201 uint16_t brt_vlan; /* vlan id */ 202 }; 203 #define brt_ifp brt_dst->bif_ifp 204 205 /* 206 * Software state for each bridge. 207 */ 208 struct bridge_softc { 209 struct ifnet *sc_ifp; /* make this an interface */ 210 LIST_ENTRY(bridge_softc) sc_list; 211 struct mtx sc_mtx; 212 struct cv sc_cv; 213 uint32_t sc_brtmax; /* max # of addresses */ 214 uint32_t sc_brtcnt; /* cur. # of addresses */ 215 uint32_t sc_brttimeout; /* rt timeout in seconds */ 216 struct callout sc_brcallout; /* bridge callout */ 217 uint32_t sc_iflist_ref; /* refcount for sc_iflist */ 218 uint32_t sc_iflist_xcnt; /* refcount for sc_iflist */ 219 LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 220 LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 221 LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 222 uint32_t sc_rthash_key; /* key for hash */ 223 LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 224 struct bstp_state sc_stp; /* STP state */ 225 uint32_t sc_brtexceeded; /* # of cache drops */ 226 struct ifnet *sc_ifaddr; /* member mac copied from */ 227 u_char sc_defaddr[6]; /* Default MAC address */ 228 }; 229 230 static VNET_DEFINE(struct mtx, bridge_list_mtx); 231 #define V_bridge_list_mtx VNET(bridge_list_mtx) 232 static eventhandler_tag bridge_detach_cookie; 233 234 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 235 236 uma_zone_t bridge_rtnode_zone; 237 238 static int bridge_clone_create(struct if_clone *, int, caddr_t); 239 static void bridge_clone_destroy(struct ifnet *); 240 241 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 242 static void bridge_mutecaps(struct bridge_softc *); 243 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 244 int); 245 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 246 static void bridge_init(void *); 247 static void bridge_dummynet(struct mbuf *, struct ifnet *); 248 static void bridge_stop(struct ifnet *, int); 249 static int bridge_transmit(struct ifnet *, struct mbuf *); 250 static void bridge_qflush(struct ifnet *); 251 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 252 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 253 struct rtentry *); 254 static int bridge_enqueue(struct bridge_softc *, struct ifnet *, 255 struct mbuf *); 256 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 257 258 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 259 struct mbuf *m); 260 261 static void bridge_timer(void *); 262 263 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 264 struct mbuf *, int); 265 static void bridge_span(struct bridge_softc *, struct mbuf *); 266 267 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 268 uint16_t, struct bridge_iflist *, int, uint8_t); 269 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 270 uint16_t); 271 static void bridge_rttrim(struct bridge_softc *); 272 static void bridge_rtage(struct bridge_softc *); 273 static void bridge_rtflush(struct bridge_softc *, int); 274 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 275 uint16_t); 276 277 static void bridge_rtable_init(struct bridge_softc *); 278 static void bridge_rtable_fini(struct bridge_softc *); 279 280 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 281 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 282 const uint8_t *, uint16_t); 283 static int bridge_rtnode_insert(struct bridge_softc *, 284 struct bridge_rtnode *); 285 static void bridge_rtnode_destroy(struct bridge_softc *, 286 struct bridge_rtnode *); 287 static void bridge_rtable_expire(struct ifnet *, int); 288 static void bridge_state_change(struct ifnet *, int); 289 290 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 291 const char *name); 292 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 293 struct ifnet *ifp); 294 static void bridge_delete_member(struct bridge_softc *, 295 struct bridge_iflist *, int); 296 static void bridge_delete_span(struct bridge_softc *, 297 struct bridge_iflist *); 298 299 static int bridge_ioctl_add(struct bridge_softc *, void *); 300 static int bridge_ioctl_del(struct bridge_softc *, void *); 301 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 302 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 303 static int bridge_ioctl_scache(struct bridge_softc *, void *); 304 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 305 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 306 static int bridge_ioctl_rts(struct bridge_softc *, void *); 307 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 308 static int bridge_ioctl_sto(struct bridge_softc *, void *); 309 static int bridge_ioctl_gto(struct bridge_softc *, void *); 310 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 311 static int bridge_ioctl_flush(struct bridge_softc *, void *); 312 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 313 static int bridge_ioctl_spri(struct bridge_softc *, void *); 314 static int bridge_ioctl_ght(struct bridge_softc *, void *); 315 static int bridge_ioctl_sht(struct bridge_softc *, void *); 316 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 317 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 318 static int bridge_ioctl_gma(struct bridge_softc *, void *); 319 static int bridge_ioctl_sma(struct bridge_softc *, void *); 320 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 321 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 322 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 323 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 324 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 325 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 326 static int bridge_ioctl_grte(struct bridge_softc *, void *); 327 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 328 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 329 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 330 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 331 int); 332 static int bridge_ip_checkbasic(struct mbuf **mp); 333 #ifdef INET6 334 static int bridge_ip6_checkbasic(struct mbuf **mp); 335 #endif /* INET6 */ 336 static int bridge_fragment(struct ifnet *, struct mbuf *, 337 struct ether_header *, int, struct llc *); 338 static void bridge_linkstate(struct ifnet *ifp); 339 static void bridge_linkcheck(struct bridge_softc *sc); 340 341 extern void (*bridge_linkstate_p)(struct ifnet *ifp); 342 343 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 344 #define VLANTAGOF(_m) \ 345 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 346 347 static struct bstp_cb_ops bridge_ops = { 348 .bcb_state = bridge_state_change, 349 .bcb_rtage = bridge_rtable_expire 350 }; 351 352 SYSCTL_DECL(_net_link); 353 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW, 0, "Bridge"); 354 355 /* only pass IP[46] packets when pfil is enabled */ 356 static VNET_DEFINE(int, pfil_onlyip) = 1; 357 #define V_pfil_onlyip VNET(pfil_onlyip) 358 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, 359 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0, 360 "Only pass IP packets when pfil is enabled"); 361 362 /* run pfil hooks on the bridge interface */ 363 static VNET_DEFINE(int, pfil_bridge) = 1; 364 #define V_pfil_bridge VNET(pfil_bridge) 365 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, 366 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0, 367 "Packet filter on the bridge interface"); 368 369 /* layer2 filter with ipfw */ 370 static VNET_DEFINE(int, pfil_ipfw); 371 #define V_pfil_ipfw VNET(pfil_ipfw) 372 373 /* layer2 ARP filter with ipfw */ 374 static VNET_DEFINE(int, pfil_ipfw_arp); 375 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp) 376 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, 377 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0, 378 "Filter ARP packets through IPFW layer2"); 379 380 /* run pfil hooks on the member interface */ 381 static VNET_DEFINE(int, pfil_member) = 1; 382 #define V_pfil_member VNET(pfil_member) 383 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, 384 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0, 385 "Packet filter on the member interface"); 386 387 /* run pfil hooks on the physical interface for locally destined packets */ 388 static VNET_DEFINE(int, pfil_local_phys); 389 #define V_pfil_local_phys VNET(pfil_local_phys) 390 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, 391 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0, 392 "Packet filter on the physical interface for locally destined packets"); 393 394 /* log STP state changes */ 395 static VNET_DEFINE(int, log_stp); 396 #define V_log_stp VNET(log_stp) 397 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, 398 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0, 399 "Log STP state changes"); 400 401 /* share MAC with first bridge member */ 402 static VNET_DEFINE(int, bridge_inherit_mac); 403 #define V_bridge_inherit_mac VNET(bridge_inherit_mac) 404 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, 405 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0, 406 "Inherit MAC address from the first bridge member"); 407 408 static VNET_DEFINE(int, allow_llz_overlap) = 0; 409 #define V_allow_llz_overlap VNET(allow_llz_overlap) 410 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, 411 CTLFLAG_VNET | CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0, 412 "Allow overlap of link-local scope " 413 "zones of a bridge interface and the member interfaces"); 414 415 struct bridge_control { 416 int (*bc_func)(struct bridge_softc *, void *); 417 int bc_argsize; 418 int bc_flags; 419 }; 420 421 #define BC_F_COPYIN 0x01 /* copy arguments in */ 422 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 423 #define BC_F_SUSER 0x04 /* do super-user check */ 424 425 const struct bridge_control bridge_control_table[] = { 426 { bridge_ioctl_add, sizeof(struct ifbreq), 427 BC_F_COPYIN|BC_F_SUSER }, 428 { bridge_ioctl_del, sizeof(struct ifbreq), 429 BC_F_COPYIN|BC_F_SUSER }, 430 431 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 432 BC_F_COPYIN|BC_F_COPYOUT }, 433 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 434 BC_F_COPYIN|BC_F_SUSER }, 435 436 { bridge_ioctl_scache, sizeof(struct ifbrparam), 437 BC_F_COPYIN|BC_F_SUSER }, 438 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 439 BC_F_COPYOUT }, 440 441 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 442 BC_F_COPYIN|BC_F_COPYOUT }, 443 { bridge_ioctl_rts, sizeof(struct ifbaconf), 444 BC_F_COPYIN|BC_F_COPYOUT }, 445 446 { bridge_ioctl_saddr, sizeof(struct ifbareq), 447 BC_F_COPYIN|BC_F_SUSER }, 448 449 { bridge_ioctl_sto, sizeof(struct ifbrparam), 450 BC_F_COPYIN|BC_F_SUSER }, 451 { bridge_ioctl_gto, sizeof(struct ifbrparam), 452 BC_F_COPYOUT }, 453 454 { bridge_ioctl_daddr, sizeof(struct ifbareq), 455 BC_F_COPYIN|BC_F_SUSER }, 456 457 { bridge_ioctl_flush, sizeof(struct ifbreq), 458 BC_F_COPYIN|BC_F_SUSER }, 459 460 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 461 BC_F_COPYOUT }, 462 { bridge_ioctl_spri, sizeof(struct ifbrparam), 463 BC_F_COPYIN|BC_F_SUSER }, 464 465 { bridge_ioctl_ght, sizeof(struct ifbrparam), 466 BC_F_COPYOUT }, 467 { bridge_ioctl_sht, sizeof(struct ifbrparam), 468 BC_F_COPYIN|BC_F_SUSER }, 469 470 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 471 BC_F_COPYOUT }, 472 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 473 BC_F_COPYIN|BC_F_SUSER }, 474 475 { bridge_ioctl_gma, sizeof(struct ifbrparam), 476 BC_F_COPYOUT }, 477 { bridge_ioctl_sma, sizeof(struct ifbrparam), 478 BC_F_COPYIN|BC_F_SUSER }, 479 480 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 481 BC_F_COPYIN|BC_F_SUSER }, 482 483 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 484 BC_F_COPYIN|BC_F_SUSER }, 485 486 { bridge_ioctl_addspan, sizeof(struct ifbreq), 487 BC_F_COPYIN|BC_F_SUSER }, 488 { bridge_ioctl_delspan, sizeof(struct ifbreq), 489 BC_F_COPYIN|BC_F_SUSER }, 490 491 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 492 BC_F_COPYOUT }, 493 494 { bridge_ioctl_grte, sizeof(struct ifbrparam), 495 BC_F_COPYOUT }, 496 497 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 498 BC_F_COPYIN|BC_F_COPYOUT }, 499 500 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 501 BC_F_COPYIN|BC_F_SUSER }, 502 503 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 504 BC_F_COPYIN|BC_F_SUSER }, 505 506 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 507 BC_F_COPYIN|BC_F_SUSER }, 508 509 }; 510 const int bridge_control_table_size = nitems(bridge_control_table); 511 512 static VNET_DEFINE(LIST_HEAD(, bridge_softc), bridge_list); 513 #define V_bridge_list VNET(bridge_list) 514 #define BRIDGE_LIST_LOCK_INIT(x) mtx_init(&V_bridge_list_mtx, \ 515 "if_bridge list", NULL, MTX_DEF) 516 #define BRIDGE_LIST_LOCK_DESTROY(x) mtx_destroy(&V_bridge_list_mtx) 517 #define BRIDGE_LIST_LOCK(x) mtx_lock(&V_bridge_list_mtx) 518 #define BRIDGE_LIST_UNLOCK(x) mtx_unlock(&V_bridge_list_mtx) 519 520 static VNET_DEFINE(struct if_clone *, bridge_cloner); 521 #define V_bridge_cloner VNET(bridge_cloner) 522 523 static const char bridge_name[] = "bridge"; 524 525 static void 526 vnet_bridge_init(const void *unused __unused) 527 { 528 529 BRIDGE_LIST_LOCK_INIT(); 530 LIST_INIT(&V_bridge_list); 531 V_bridge_cloner = if_clone_simple(bridge_name, 532 bridge_clone_create, bridge_clone_destroy, 0); 533 } 534 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 535 vnet_bridge_init, NULL); 536 537 static void 538 vnet_bridge_uninit(const void *unused __unused) 539 { 540 541 if_clone_detach(V_bridge_cloner); 542 V_bridge_cloner = NULL; 543 BRIDGE_LIST_LOCK_DESTROY(); 544 } 545 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, 546 vnet_bridge_uninit, NULL); 547 548 static int 549 bridge_modevent(module_t mod, int type, void *data) 550 { 551 552 switch (type) { 553 case MOD_LOAD: 554 bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 555 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 556 UMA_ALIGN_PTR, 0); 557 bridge_input_p = bridge_input; 558 bridge_output_p = bridge_output; 559 bridge_dn_p = bridge_dummynet; 560 bridge_linkstate_p = bridge_linkstate; 561 bridge_detach_cookie = EVENTHANDLER_REGISTER( 562 ifnet_departure_event, bridge_ifdetach, NULL, 563 EVENTHANDLER_PRI_ANY); 564 break; 565 case MOD_UNLOAD: 566 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 567 bridge_detach_cookie); 568 uma_zdestroy(bridge_rtnode_zone); 569 bridge_input_p = NULL; 570 bridge_output_p = NULL; 571 bridge_dn_p = NULL; 572 bridge_linkstate_p = NULL; 573 break; 574 default: 575 return (EOPNOTSUPP); 576 } 577 return (0); 578 } 579 580 static moduledata_t bridge_mod = { 581 "if_bridge", 582 bridge_modevent, 583 0 584 }; 585 586 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 587 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 588 589 /* 590 * handler for net.link.bridge.ipfw 591 */ 592 static int 593 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 594 { 595 int enable = V_pfil_ipfw; 596 int error; 597 598 error = sysctl_handle_int(oidp, &enable, 0, req); 599 enable &= 1; 600 601 if (enable != V_pfil_ipfw) { 602 V_pfil_ipfw = enable; 603 604 /* 605 * Disable pfil so that ipfw doesnt run twice, if the user 606 * really wants both then they can re-enable pfil_bridge and/or 607 * pfil_member. Also allow non-ip packets as ipfw can filter by 608 * layer2 type. 609 */ 610 if (V_pfil_ipfw) { 611 V_pfil_onlyip = 0; 612 V_pfil_bridge = 0; 613 V_pfil_member = 0; 614 } 615 } 616 617 return (error); 618 } 619 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, 620 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET, 621 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I", 622 "Layer2 filter with IPFW"); 623 624 /* 625 * bridge_clone_create: 626 * 627 * Create a new bridge instance. 628 */ 629 static int 630 bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params) 631 { 632 struct bridge_softc *sc, *sc2; 633 struct ifnet *bifp, *ifp; 634 int fb, retry; 635 unsigned long hostid; 636 637 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 638 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 639 if (ifp == NULL) { 640 free(sc, M_DEVBUF); 641 return (ENOSPC); 642 } 643 644 BRIDGE_LOCK_INIT(sc); 645 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 646 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 647 648 /* Initialize our routing table. */ 649 bridge_rtable_init(sc); 650 651 callout_init_mtx(&sc->sc_brcallout, &sc->sc_mtx, 0); 652 653 LIST_INIT(&sc->sc_iflist); 654 LIST_INIT(&sc->sc_spanlist); 655 656 ifp->if_softc = sc; 657 if_initname(ifp, bridge_name, unit); 658 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 659 ifp->if_ioctl = bridge_ioctl; 660 ifp->if_transmit = bridge_transmit; 661 ifp->if_qflush = bridge_qflush; 662 ifp->if_init = bridge_init; 663 ifp->if_type = IFT_BRIDGE; 664 665 /* 666 * Generate an ethernet address with a locally administered address. 667 * 668 * Since we are using random ethernet addresses for the bridge, it is 669 * possible that we might have address collisions, so make sure that 670 * this hardware address isn't already in use on another bridge. 671 * The first try uses the hostid and falls back to arc4rand(). 672 */ 673 fb = 0; 674 getcredhostid(curthread->td_ucred, &hostid); 675 do { 676 if (fb || hostid == 0) { 677 arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1); 678 sc->sc_defaddr[0] &= ~1;/* clear multicast bit */ 679 sc->sc_defaddr[0] |= 2; /* set the LAA bit */ 680 } else { 681 sc->sc_defaddr[0] = 0x2; 682 sc->sc_defaddr[1] = (hostid >> 24) & 0xff; 683 sc->sc_defaddr[2] = (hostid >> 16) & 0xff; 684 sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff; 685 sc->sc_defaddr[4] = hostid & 0xff; 686 sc->sc_defaddr[5] = ifp->if_dunit & 0xff; 687 } 688 689 fb = 1; 690 retry = 0; 691 BRIDGE_LIST_LOCK(); 692 LIST_FOREACH(sc2, &V_bridge_list, sc_list) { 693 bifp = sc2->sc_ifp; 694 if (memcmp(sc->sc_defaddr, 695 IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) { 696 retry = 1; 697 break; 698 } 699 } 700 BRIDGE_LIST_UNLOCK(); 701 } while (retry == 1); 702 703 bstp_attach(&sc->sc_stp, &bridge_ops); 704 ether_ifattach(ifp, sc->sc_defaddr); 705 /* Now undo some of the damage... */ 706 ifp->if_baudrate = 0; 707 ifp->if_type = IFT_BRIDGE; 708 709 BRIDGE_LIST_LOCK(); 710 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list); 711 BRIDGE_LIST_UNLOCK(); 712 713 return (0); 714 } 715 716 /* 717 * bridge_clone_destroy: 718 * 719 * Destroy a bridge instance. 720 */ 721 static void 722 bridge_clone_destroy(struct ifnet *ifp) 723 { 724 struct bridge_softc *sc = ifp->if_softc; 725 struct bridge_iflist *bif; 726 727 BRIDGE_LOCK(sc); 728 729 bridge_stop(ifp, 1); 730 ifp->if_flags &= ~IFF_UP; 731 732 while ((bif = LIST_FIRST(&sc->sc_iflist)) != NULL) 733 bridge_delete_member(sc, bif, 0); 734 735 while ((bif = LIST_FIRST(&sc->sc_spanlist)) != NULL) { 736 bridge_delete_span(sc, bif); 737 } 738 739 BRIDGE_UNLOCK(sc); 740 741 callout_drain(&sc->sc_brcallout); 742 743 BRIDGE_LIST_LOCK(); 744 LIST_REMOVE(sc, sc_list); 745 BRIDGE_LIST_UNLOCK(); 746 747 bstp_detach(&sc->sc_stp); 748 ether_ifdetach(ifp); 749 if_free(ifp); 750 751 /* Tear down the routing table. */ 752 bridge_rtable_fini(sc); 753 754 BRIDGE_LOCK_DESTROY(sc); 755 free(sc, M_DEVBUF); 756 } 757 758 /* 759 * bridge_ioctl: 760 * 761 * Handle a control request from the operator. 762 */ 763 static int 764 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 765 { 766 struct bridge_softc *sc = ifp->if_softc; 767 struct ifreq *ifr = (struct ifreq *)data; 768 struct bridge_iflist *bif; 769 struct thread *td = curthread; 770 union { 771 struct ifbreq ifbreq; 772 struct ifbifconf ifbifconf; 773 struct ifbareq ifbareq; 774 struct ifbaconf ifbaconf; 775 struct ifbrparam ifbrparam; 776 struct ifbropreq ifbropreq; 777 } args; 778 struct ifdrv *ifd = (struct ifdrv *) data; 779 const struct bridge_control *bc; 780 int error = 0; 781 782 switch (cmd) { 783 784 case SIOCADDMULTI: 785 case SIOCDELMULTI: 786 break; 787 788 case SIOCGDRVSPEC: 789 case SIOCSDRVSPEC: 790 if (ifd->ifd_cmd >= bridge_control_table_size) { 791 error = EINVAL; 792 break; 793 } 794 bc = &bridge_control_table[ifd->ifd_cmd]; 795 796 if (cmd == SIOCGDRVSPEC && 797 (bc->bc_flags & BC_F_COPYOUT) == 0) { 798 error = EINVAL; 799 break; 800 } 801 else if (cmd == SIOCSDRVSPEC && 802 (bc->bc_flags & BC_F_COPYOUT) != 0) { 803 error = EINVAL; 804 break; 805 } 806 807 if (bc->bc_flags & BC_F_SUSER) { 808 error = priv_check(td, PRIV_NET_BRIDGE); 809 if (error) 810 break; 811 } 812 813 if (ifd->ifd_len != bc->bc_argsize || 814 ifd->ifd_len > sizeof(args)) { 815 error = EINVAL; 816 break; 817 } 818 819 bzero(&args, sizeof(args)); 820 if (bc->bc_flags & BC_F_COPYIN) { 821 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 822 if (error) 823 break; 824 } 825 826 BRIDGE_LOCK(sc); 827 error = (*bc->bc_func)(sc, &args); 828 BRIDGE_UNLOCK(sc); 829 if (error) 830 break; 831 832 if (bc->bc_flags & BC_F_COPYOUT) 833 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 834 835 break; 836 837 case SIOCSIFFLAGS: 838 if (!(ifp->if_flags & IFF_UP) && 839 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 840 /* 841 * If interface is marked down and it is running, 842 * then stop and disable it. 843 */ 844 BRIDGE_LOCK(sc); 845 bridge_stop(ifp, 1); 846 BRIDGE_UNLOCK(sc); 847 } else if ((ifp->if_flags & IFF_UP) && 848 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 849 /* 850 * If interface is marked up and it is stopped, then 851 * start it. 852 */ 853 (*ifp->if_init)(sc); 854 } 855 break; 856 857 case SIOCSIFMTU: 858 if (ifr->ifr_mtu < 576) { 859 error = EINVAL; 860 break; 861 } 862 if (LIST_EMPTY(&sc->sc_iflist)) { 863 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 864 break; 865 } 866 BRIDGE_LOCK(sc); 867 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 868 if (bif->bif_ifp->if_mtu != ifr->ifr_mtu) { 869 log(LOG_NOTICE, "%s: invalid MTU: %u(%s)" 870 " != %d\n", sc->sc_ifp->if_xname, 871 bif->bif_ifp->if_mtu, 872 bif->bif_ifp->if_xname, ifr->ifr_mtu); 873 error = EINVAL; 874 break; 875 } 876 } 877 if (!error) 878 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 879 BRIDGE_UNLOCK(sc); 880 break; 881 default: 882 /* 883 * drop the lock as ether_ioctl() will call bridge_start() and 884 * cause the lock to be recursed. 885 */ 886 error = ether_ioctl(ifp, cmd, data); 887 break; 888 } 889 890 return (error); 891 } 892 893 /* 894 * bridge_mutecaps: 895 * 896 * Clear or restore unwanted capabilities on the member interface 897 */ 898 static void 899 bridge_mutecaps(struct bridge_softc *sc) 900 { 901 struct bridge_iflist *bif; 902 int enabled, mask; 903 904 /* Initial bitmask of capabilities to test */ 905 mask = BRIDGE_IFCAPS_MASK; 906 907 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 908 /* Every member must support it or its disabled */ 909 mask &= bif->bif_savedcaps; 910 } 911 912 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 913 enabled = bif->bif_ifp->if_capenable; 914 enabled &= ~BRIDGE_IFCAPS_STRIP; 915 /* strip off mask bits and enable them again if allowed */ 916 enabled &= ~BRIDGE_IFCAPS_MASK; 917 enabled |= mask; 918 bridge_set_ifcap(sc, bif, enabled); 919 } 920 921 } 922 923 static void 924 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 925 { 926 struct ifnet *ifp = bif->bif_ifp; 927 struct ifreq ifr; 928 int error; 929 930 bzero(&ifr, sizeof(ifr)); 931 ifr.ifr_reqcap = set; 932 933 if (ifp->if_capenable != set) { 934 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 935 if (error) 936 if_printf(sc->sc_ifp, 937 "error setting interface capabilities on %s\n", 938 ifp->if_xname); 939 } 940 } 941 942 /* 943 * bridge_lookup_member: 944 * 945 * Lookup a bridge member interface. 946 */ 947 static struct bridge_iflist * 948 bridge_lookup_member(struct bridge_softc *sc, const char *name) 949 { 950 struct bridge_iflist *bif; 951 struct ifnet *ifp; 952 953 BRIDGE_LOCK_ASSERT(sc); 954 955 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 956 ifp = bif->bif_ifp; 957 if (strcmp(ifp->if_xname, name) == 0) 958 return (bif); 959 } 960 961 return (NULL); 962 } 963 964 /* 965 * bridge_lookup_member_if: 966 * 967 * Lookup a bridge member interface by ifnet*. 968 */ 969 static struct bridge_iflist * 970 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 971 { 972 struct bridge_iflist *bif; 973 974 BRIDGE_LOCK_ASSERT(sc); 975 976 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 977 if (bif->bif_ifp == member_ifp) 978 return (bif); 979 } 980 981 return (NULL); 982 } 983 984 /* 985 * bridge_delete_member: 986 * 987 * Delete the specified member interface. 988 */ 989 static void 990 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 991 int gone) 992 { 993 struct ifnet *ifs = bif->bif_ifp; 994 struct ifnet *fif = NULL; 995 996 BRIDGE_LOCK_ASSERT(sc); 997 998 if (bif->bif_flags & IFBIF_STP) 999 bstp_disable(&bif->bif_stp); 1000 1001 ifs->if_bridge = NULL; 1002 BRIDGE_XLOCK(sc); 1003 LIST_REMOVE(bif, bif_next); 1004 BRIDGE_XDROP(sc); 1005 1006 /* 1007 * If removing the interface that gave the bridge its mac address, set 1008 * the mac address of the bridge to the address of the next member, or 1009 * to its default address if no members are left. 1010 */ 1011 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) { 1012 if (LIST_EMPTY(&sc->sc_iflist)) { 1013 bcopy(sc->sc_defaddr, 1014 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1015 sc->sc_ifaddr = NULL; 1016 } else { 1017 fif = LIST_FIRST(&sc->sc_iflist)->bif_ifp; 1018 bcopy(IF_LLADDR(fif), 1019 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1020 sc->sc_ifaddr = fif; 1021 } 1022 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1023 } 1024 1025 bridge_linkcheck(sc); 1026 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 1027 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 1028 KASSERT(bif->bif_addrcnt == 0, 1029 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 1030 1031 BRIDGE_UNLOCK(sc); 1032 if (!gone) { 1033 switch (ifs->if_type) { 1034 case IFT_ETHER: 1035 case IFT_L2VLAN: 1036 /* 1037 * Take the interface out of promiscuous mode, but only 1038 * if it was promiscuous in the first place. It might 1039 * not be if we're in the bridge_ioctl_add() error path. 1040 */ 1041 if (ifs->if_flags & IFF_PROMISC) 1042 (void) ifpromisc(ifs, 0); 1043 break; 1044 1045 case IFT_GIF: 1046 break; 1047 1048 default: 1049 #ifdef DIAGNOSTIC 1050 panic("bridge_delete_member: impossible"); 1051 #endif 1052 break; 1053 } 1054 /* reneable any interface capabilities */ 1055 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 1056 } 1057 bstp_destroy(&bif->bif_stp); /* prepare to free */ 1058 BRIDGE_LOCK(sc); 1059 free(bif, M_DEVBUF); 1060 } 1061 1062 /* 1063 * bridge_delete_span: 1064 * 1065 * Delete the specified span interface. 1066 */ 1067 static void 1068 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1069 { 1070 BRIDGE_LOCK_ASSERT(sc); 1071 1072 KASSERT(bif->bif_ifp->if_bridge == NULL, 1073 ("%s: not a span interface", __func__)); 1074 1075 LIST_REMOVE(bif, bif_next); 1076 free(bif, M_DEVBUF); 1077 } 1078 1079 static int 1080 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1081 { 1082 struct ifbreq *req = arg; 1083 struct bridge_iflist *bif = NULL; 1084 struct ifnet *ifs; 1085 int error = 0; 1086 1087 ifs = ifunit(req->ifbr_ifsname); 1088 if (ifs == NULL) 1089 return (ENOENT); 1090 if (ifs->if_ioctl == NULL) /* must be supported */ 1091 return (EINVAL); 1092 1093 /* If it's in the span list, it can't be a member. */ 1094 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1095 if (ifs == bif->bif_ifp) 1096 return (EBUSY); 1097 1098 if (ifs->if_bridge == sc) 1099 return (EEXIST); 1100 1101 if (ifs->if_bridge != NULL) 1102 return (EBUSY); 1103 1104 switch (ifs->if_type) { 1105 case IFT_ETHER: 1106 case IFT_L2VLAN: 1107 case IFT_GIF: 1108 /* permitted interface types */ 1109 break; 1110 default: 1111 return (EINVAL); 1112 } 1113 1114 #ifdef INET6 1115 /* 1116 * Two valid inet6 addresses with link-local scope must not be 1117 * on the parent interface and the member interfaces at the 1118 * same time. This restriction is needed to prevent violation 1119 * of link-local scope zone. Attempts to add a member 1120 * interface which has inet6 addresses when the parent has 1121 * inet6 triggers removal of all inet6 addresses on the member 1122 * interface. 1123 */ 1124 1125 /* Check if the parent interface has a link-local scope addr. */ 1126 if (V_allow_llz_overlap == 0 && 1127 in6ifa_llaonifp(sc->sc_ifp) != NULL) { 1128 /* 1129 * If any, remove all inet6 addresses from the member 1130 * interfaces. 1131 */ 1132 BRIDGE_XLOCK(sc); 1133 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1134 if (in6ifa_llaonifp(bif->bif_ifp)) { 1135 BRIDGE_UNLOCK(sc); 1136 in6_ifdetach(bif->bif_ifp); 1137 BRIDGE_LOCK(sc); 1138 if_printf(sc->sc_ifp, 1139 "IPv6 addresses on %s have been removed " 1140 "before adding it as a member to prevent " 1141 "IPv6 address scope violation.\n", 1142 bif->bif_ifp->if_xname); 1143 } 1144 } 1145 BRIDGE_XDROP(sc); 1146 if (in6ifa_llaonifp(ifs)) { 1147 BRIDGE_UNLOCK(sc); 1148 in6_ifdetach(ifs); 1149 BRIDGE_LOCK(sc); 1150 if_printf(sc->sc_ifp, 1151 "IPv6 addresses on %s have been removed " 1152 "before adding it as a member to prevent " 1153 "IPv6 address scope violation.\n", 1154 ifs->if_xname); 1155 } 1156 } 1157 #endif 1158 /* Allow the first Ethernet member to define the MTU */ 1159 if (LIST_EMPTY(&sc->sc_iflist)) 1160 sc->sc_ifp->if_mtu = ifs->if_mtu; 1161 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1162 if_printf(sc->sc_ifp, "invalid MTU: %u(%s) != %u\n", 1163 ifs->if_mtu, ifs->if_xname, sc->sc_ifp->if_mtu); 1164 return (EINVAL); 1165 } 1166 1167 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1168 if (bif == NULL) 1169 return (ENOMEM); 1170 1171 bif->bif_ifp = ifs; 1172 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1173 bif->bif_savedcaps = ifs->if_capenable; 1174 1175 /* 1176 * Assign the interface's MAC address to the bridge if it's the first 1177 * member and the MAC address of the bridge has not been changed from 1178 * the default randomly generated one. 1179 */ 1180 if (V_bridge_inherit_mac && LIST_EMPTY(&sc->sc_iflist) && 1181 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr, ETHER_ADDR_LEN)) { 1182 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1183 sc->sc_ifaddr = ifs; 1184 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1185 } 1186 1187 ifs->if_bridge = sc; 1188 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1189 /* 1190 * XXX: XLOCK HERE!?! 1191 * 1192 * NOTE: insert_***HEAD*** should be safe for the traversals. 1193 */ 1194 LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1195 1196 /* Set interface capabilities to the intersection set of all members */ 1197 bridge_mutecaps(sc); 1198 bridge_linkcheck(sc); 1199 1200 /* Place the interface into promiscuous mode */ 1201 switch (ifs->if_type) { 1202 case IFT_ETHER: 1203 case IFT_L2VLAN: 1204 BRIDGE_UNLOCK(sc); 1205 error = ifpromisc(ifs, 1); 1206 BRIDGE_LOCK(sc); 1207 break; 1208 } 1209 1210 if (error) 1211 bridge_delete_member(sc, bif, 0); 1212 return (error); 1213 } 1214 1215 static int 1216 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1217 { 1218 struct ifbreq *req = arg; 1219 struct bridge_iflist *bif; 1220 1221 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1222 if (bif == NULL) 1223 return (ENOENT); 1224 1225 bridge_delete_member(sc, bif, 0); 1226 1227 return (0); 1228 } 1229 1230 static int 1231 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1232 { 1233 struct ifbreq *req = arg; 1234 struct bridge_iflist *bif; 1235 struct bstp_port *bp; 1236 1237 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1238 if (bif == NULL) 1239 return (ENOENT); 1240 1241 bp = &bif->bif_stp; 1242 req->ifbr_ifsflags = bif->bif_flags; 1243 req->ifbr_state = bp->bp_state; 1244 req->ifbr_priority = bp->bp_priority; 1245 req->ifbr_path_cost = bp->bp_path_cost; 1246 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1247 req->ifbr_proto = bp->bp_protover; 1248 req->ifbr_role = bp->bp_role; 1249 req->ifbr_stpflags = bp->bp_flags; 1250 req->ifbr_addrcnt = bif->bif_addrcnt; 1251 req->ifbr_addrmax = bif->bif_addrmax; 1252 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1253 1254 /* Copy STP state options as flags */ 1255 if (bp->bp_operedge) 1256 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1257 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1258 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1259 if (bp->bp_ptp_link) 1260 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1261 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1262 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1263 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1264 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1265 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1266 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1267 return (0); 1268 } 1269 1270 static int 1271 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1272 { 1273 struct ifbreq *req = arg; 1274 struct bridge_iflist *bif; 1275 struct bstp_port *bp; 1276 int error; 1277 1278 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1279 if (bif == NULL) 1280 return (ENOENT); 1281 bp = &bif->bif_stp; 1282 1283 if (req->ifbr_ifsflags & IFBIF_SPAN) 1284 /* SPAN is readonly */ 1285 return (EINVAL); 1286 1287 if (req->ifbr_ifsflags & IFBIF_STP) { 1288 if ((bif->bif_flags & IFBIF_STP) == 0) { 1289 error = bstp_enable(&bif->bif_stp); 1290 if (error) 1291 return (error); 1292 } 1293 } else { 1294 if ((bif->bif_flags & IFBIF_STP) != 0) 1295 bstp_disable(&bif->bif_stp); 1296 } 1297 1298 /* Pass on STP flags */ 1299 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1300 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1301 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1302 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1303 1304 /* Save the bits relating to the bridge */ 1305 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1306 1307 return (0); 1308 } 1309 1310 static int 1311 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1312 { 1313 struct ifbrparam *param = arg; 1314 1315 sc->sc_brtmax = param->ifbrp_csize; 1316 bridge_rttrim(sc); 1317 1318 return (0); 1319 } 1320 1321 static int 1322 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1323 { 1324 struct ifbrparam *param = arg; 1325 1326 param->ifbrp_csize = sc->sc_brtmax; 1327 1328 return (0); 1329 } 1330 1331 static int 1332 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1333 { 1334 struct ifbifconf *bifc = arg; 1335 struct bridge_iflist *bif; 1336 struct ifbreq breq; 1337 char *buf, *outbuf; 1338 int count, buflen, len, error = 0; 1339 1340 count = 0; 1341 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1342 count++; 1343 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1344 count++; 1345 1346 buflen = sizeof(breq) * count; 1347 if (bifc->ifbic_len == 0) { 1348 bifc->ifbic_len = buflen; 1349 return (0); 1350 } 1351 BRIDGE_UNLOCK(sc); 1352 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1353 BRIDGE_LOCK(sc); 1354 1355 count = 0; 1356 buf = outbuf; 1357 len = min(bifc->ifbic_len, buflen); 1358 bzero(&breq, sizeof(breq)); 1359 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1360 if (len < sizeof(breq)) 1361 break; 1362 1363 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1364 sizeof(breq.ifbr_ifsname)); 1365 /* Fill in the ifbreq structure */ 1366 error = bridge_ioctl_gifflags(sc, &breq); 1367 if (error) 1368 break; 1369 memcpy(buf, &breq, sizeof(breq)); 1370 count++; 1371 buf += sizeof(breq); 1372 len -= sizeof(breq); 1373 } 1374 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1375 if (len < sizeof(breq)) 1376 break; 1377 1378 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1379 sizeof(breq.ifbr_ifsname)); 1380 breq.ifbr_ifsflags = bif->bif_flags; 1381 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1382 memcpy(buf, &breq, sizeof(breq)); 1383 count++; 1384 buf += sizeof(breq); 1385 len -= sizeof(breq); 1386 } 1387 1388 BRIDGE_UNLOCK(sc); 1389 bifc->ifbic_len = sizeof(breq) * count; 1390 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1391 BRIDGE_LOCK(sc); 1392 free(outbuf, M_TEMP); 1393 return (error); 1394 } 1395 1396 static int 1397 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1398 { 1399 struct ifbaconf *bac = arg; 1400 struct bridge_rtnode *brt; 1401 struct ifbareq bareq; 1402 char *buf, *outbuf; 1403 int count, buflen, len, error = 0; 1404 1405 if (bac->ifbac_len == 0) 1406 return (0); 1407 1408 count = 0; 1409 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1410 count++; 1411 buflen = sizeof(bareq) * count; 1412 1413 BRIDGE_UNLOCK(sc); 1414 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1415 BRIDGE_LOCK(sc); 1416 1417 count = 0; 1418 buf = outbuf; 1419 len = min(bac->ifbac_len, buflen); 1420 bzero(&bareq, sizeof(bareq)); 1421 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1422 if (len < sizeof(bareq)) 1423 goto out; 1424 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1425 sizeof(bareq.ifba_ifsname)); 1426 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1427 bareq.ifba_vlan = brt->brt_vlan; 1428 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1429 time_uptime < brt->brt_expire) 1430 bareq.ifba_expire = brt->brt_expire - time_uptime; 1431 else 1432 bareq.ifba_expire = 0; 1433 bareq.ifba_flags = brt->brt_flags; 1434 1435 memcpy(buf, &bareq, sizeof(bareq)); 1436 count++; 1437 buf += sizeof(bareq); 1438 len -= sizeof(bareq); 1439 } 1440 out: 1441 BRIDGE_UNLOCK(sc); 1442 bac->ifbac_len = sizeof(bareq) * count; 1443 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1444 BRIDGE_LOCK(sc); 1445 free(outbuf, M_TEMP); 1446 return (error); 1447 } 1448 1449 static int 1450 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1451 { 1452 struct ifbareq *req = arg; 1453 struct bridge_iflist *bif; 1454 int error; 1455 1456 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1457 if (bif == NULL) 1458 return (ENOENT); 1459 1460 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1461 req->ifba_flags); 1462 1463 return (error); 1464 } 1465 1466 static int 1467 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1468 { 1469 struct ifbrparam *param = arg; 1470 1471 sc->sc_brttimeout = param->ifbrp_ctime; 1472 return (0); 1473 } 1474 1475 static int 1476 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1477 { 1478 struct ifbrparam *param = arg; 1479 1480 param->ifbrp_ctime = sc->sc_brttimeout; 1481 return (0); 1482 } 1483 1484 static int 1485 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1486 { 1487 struct ifbareq *req = arg; 1488 1489 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1490 } 1491 1492 static int 1493 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1494 { 1495 struct ifbreq *req = arg; 1496 1497 bridge_rtflush(sc, req->ifbr_ifsflags); 1498 return (0); 1499 } 1500 1501 static int 1502 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1503 { 1504 struct ifbrparam *param = arg; 1505 struct bstp_state *bs = &sc->sc_stp; 1506 1507 param->ifbrp_prio = bs->bs_bridge_priority; 1508 return (0); 1509 } 1510 1511 static int 1512 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1513 { 1514 struct ifbrparam *param = arg; 1515 1516 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1517 } 1518 1519 static int 1520 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1521 { 1522 struct ifbrparam *param = arg; 1523 struct bstp_state *bs = &sc->sc_stp; 1524 1525 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1526 return (0); 1527 } 1528 1529 static int 1530 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1531 { 1532 struct ifbrparam *param = arg; 1533 1534 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1535 } 1536 1537 static int 1538 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1539 { 1540 struct ifbrparam *param = arg; 1541 struct bstp_state *bs = &sc->sc_stp; 1542 1543 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1544 return (0); 1545 } 1546 1547 static int 1548 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1549 { 1550 struct ifbrparam *param = arg; 1551 1552 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1553 } 1554 1555 static int 1556 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1557 { 1558 struct ifbrparam *param = arg; 1559 struct bstp_state *bs = &sc->sc_stp; 1560 1561 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1562 return (0); 1563 } 1564 1565 static int 1566 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1567 { 1568 struct ifbrparam *param = arg; 1569 1570 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1571 } 1572 1573 static int 1574 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1575 { 1576 struct ifbreq *req = arg; 1577 struct bridge_iflist *bif; 1578 1579 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1580 if (bif == NULL) 1581 return (ENOENT); 1582 1583 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1584 } 1585 1586 static int 1587 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1588 { 1589 struct ifbreq *req = arg; 1590 struct bridge_iflist *bif; 1591 1592 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1593 if (bif == NULL) 1594 return (ENOENT); 1595 1596 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1597 } 1598 1599 static int 1600 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1601 { 1602 struct ifbreq *req = arg; 1603 struct bridge_iflist *bif; 1604 1605 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1606 if (bif == NULL) 1607 return (ENOENT); 1608 1609 bif->bif_addrmax = req->ifbr_addrmax; 1610 return (0); 1611 } 1612 1613 static int 1614 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1615 { 1616 struct ifbreq *req = arg; 1617 struct bridge_iflist *bif = NULL; 1618 struct ifnet *ifs; 1619 1620 ifs = ifunit(req->ifbr_ifsname); 1621 if (ifs == NULL) 1622 return (ENOENT); 1623 1624 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1625 if (ifs == bif->bif_ifp) 1626 return (EBUSY); 1627 1628 if (ifs->if_bridge != NULL) 1629 return (EBUSY); 1630 1631 switch (ifs->if_type) { 1632 case IFT_ETHER: 1633 case IFT_GIF: 1634 case IFT_L2VLAN: 1635 break; 1636 default: 1637 return (EINVAL); 1638 } 1639 1640 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1641 if (bif == NULL) 1642 return (ENOMEM); 1643 1644 bif->bif_ifp = ifs; 1645 bif->bif_flags = IFBIF_SPAN; 1646 1647 LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1648 1649 return (0); 1650 } 1651 1652 static int 1653 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1654 { 1655 struct ifbreq *req = arg; 1656 struct bridge_iflist *bif; 1657 struct ifnet *ifs; 1658 1659 ifs = ifunit(req->ifbr_ifsname); 1660 if (ifs == NULL) 1661 return (ENOENT); 1662 1663 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1664 if (ifs == bif->bif_ifp) 1665 break; 1666 1667 if (bif == NULL) 1668 return (ENOENT); 1669 1670 bridge_delete_span(sc, bif); 1671 1672 return (0); 1673 } 1674 1675 static int 1676 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1677 { 1678 struct ifbropreq *req = arg; 1679 struct bstp_state *bs = &sc->sc_stp; 1680 struct bstp_port *root_port; 1681 1682 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1683 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1684 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1685 1686 root_port = bs->bs_root_port; 1687 if (root_port == NULL) 1688 req->ifbop_root_port = 0; 1689 else 1690 req->ifbop_root_port = root_port->bp_ifp->if_index; 1691 1692 req->ifbop_holdcount = bs->bs_txholdcount; 1693 req->ifbop_priority = bs->bs_bridge_priority; 1694 req->ifbop_protocol = bs->bs_protover; 1695 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1696 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1697 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1698 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1699 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1700 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1701 1702 return (0); 1703 } 1704 1705 static int 1706 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1707 { 1708 struct ifbrparam *param = arg; 1709 1710 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1711 return (0); 1712 } 1713 1714 static int 1715 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1716 { 1717 struct ifbpstpconf *bifstp = arg; 1718 struct bridge_iflist *bif; 1719 struct bstp_port *bp; 1720 struct ifbpstpreq bpreq; 1721 char *buf, *outbuf; 1722 int count, buflen, len, error = 0; 1723 1724 count = 0; 1725 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1726 if ((bif->bif_flags & IFBIF_STP) != 0) 1727 count++; 1728 } 1729 1730 buflen = sizeof(bpreq) * count; 1731 if (bifstp->ifbpstp_len == 0) { 1732 bifstp->ifbpstp_len = buflen; 1733 return (0); 1734 } 1735 1736 BRIDGE_UNLOCK(sc); 1737 outbuf = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO); 1738 BRIDGE_LOCK(sc); 1739 1740 count = 0; 1741 buf = outbuf; 1742 len = min(bifstp->ifbpstp_len, buflen); 1743 bzero(&bpreq, sizeof(bpreq)); 1744 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1745 if (len < sizeof(bpreq)) 1746 break; 1747 1748 if ((bif->bif_flags & IFBIF_STP) == 0) 1749 continue; 1750 1751 bp = &bif->bif_stp; 1752 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1753 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1754 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1755 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1756 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1757 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1758 1759 memcpy(buf, &bpreq, sizeof(bpreq)); 1760 count++; 1761 buf += sizeof(bpreq); 1762 len -= sizeof(bpreq); 1763 } 1764 1765 BRIDGE_UNLOCK(sc); 1766 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1767 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1768 BRIDGE_LOCK(sc); 1769 free(outbuf, M_TEMP); 1770 return (error); 1771 } 1772 1773 static int 1774 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1775 { 1776 struct ifbrparam *param = arg; 1777 1778 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1779 } 1780 1781 static int 1782 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1783 { 1784 struct ifbrparam *param = arg; 1785 1786 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1787 } 1788 1789 /* 1790 * bridge_ifdetach: 1791 * 1792 * Detach an interface from a bridge. Called when a member 1793 * interface is detaching. 1794 */ 1795 static void 1796 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1797 { 1798 struct bridge_softc *sc = ifp->if_bridge; 1799 struct bridge_iflist *bif; 1800 1801 if (ifp->if_flags & IFF_RENAMING) 1802 return; 1803 if (V_bridge_cloner == NULL) { 1804 /* 1805 * This detach handler can be called after 1806 * vnet_bridge_uninit(). Just return in that case. 1807 */ 1808 return; 1809 } 1810 /* Check if the interface is a bridge member */ 1811 if (sc != NULL) { 1812 BRIDGE_LOCK(sc); 1813 1814 bif = bridge_lookup_member_if(sc, ifp); 1815 if (bif != NULL) 1816 bridge_delete_member(sc, bif, 1); 1817 1818 BRIDGE_UNLOCK(sc); 1819 return; 1820 } 1821 1822 /* Check if the interface is a span port */ 1823 BRIDGE_LIST_LOCK(); 1824 LIST_FOREACH(sc, &V_bridge_list, sc_list) { 1825 BRIDGE_LOCK(sc); 1826 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1827 if (ifp == bif->bif_ifp) { 1828 bridge_delete_span(sc, bif); 1829 break; 1830 } 1831 1832 BRIDGE_UNLOCK(sc); 1833 } 1834 BRIDGE_LIST_UNLOCK(); 1835 } 1836 1837 /* 1838 * bridge_init: 1839 * 1840 * Initialize a bridge interface. 1841 */ 1842 static void 1843 bridge_init(void *xsc) 1844 { 1845 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1846 struct ifnet *ifp = sc->sc_ifp; 1847 1848 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1849 return; 1850 1851 BRIDGE_LOCK(sc); 1852 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1853 bridge_timer, sc); 1854 1855 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1856 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1857 1858 BRIDGE_UNLOCK(sc); 1859 } 1860 1861 /* 1862 * bridge_stop: 1863 * 1864 * Stop the bridge interface. 1865 */ 1866 static void 1867 bridge_stop(struct ifnet *ifp, int disable) 1868 { 1869 struct bridge_softc *sc = ifp->if_softc; 1870 1871 BRIDGE_LOCK_ASSERT(sc); 1872 1873 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 1874 return; 1875 1876 callout_stop(&sc->sc_brcallout); 1877 bstp_stop(&sc->sc_stp); 1878 1879 bridge_rtflush(sc, IFBF_FLUSHDYN); 1880 1881 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 1882 } 1883 1884 /* 1885 * bridge_enqueue: 1886 * 1887 * Enqueue a packet on a bridge member interface. 1888 * 1889 */ 1890 static int 1891 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 1892 { 1893 int len, err = 0; 1894 short mflags; 1895 struct mbuf *m0; 1896 1897 /* We may be sending a fragment so traverse the mbuf */ 1898 for (; m; m = m0) { 1899 m0 = m->m_nextpkt; 1900 m->m_nextpkt = NULL; 1901 len = m->m_pkthdr.len; 1902 mflags = m->m_flags; 1903 1904 /* 1905 * If underlying interface can not do VLAN tag insertion itself 1906 * then attach a packet tag that holds it. 1907 */ 1908 if ((m->m_flags & M_VLANTAG) && 1909 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 1910 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 1911 if (m == NULL) { 1912 if_printf(dst_ifp, 1913 "unable to prepend VLAN header\n"); 1914 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1); 1915 continue; 1916 } 1917 m->m_flags &= ~M_VLANTAG; 1918 } 1919 1920 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 1921 m_freem(m0); 1922 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 1923 break; 1924 } 1925 1926 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1); 1927 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len); 1928 if (mflags & M_MCAST) 1929 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1); 1930 } 1931 1932 return (err); 1933 } 1934 1935 /* 1936 * bridge_dummynet: 1937 * 1938 * Receive a queued packet from dummynet and pass it on to the output 1939 * interface. 1940 * 1941 * The mbuf has the Ethernet header already attached. 1942 */ 1943 static void 1944 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 1945 { 1946 struct bridge_softc *sc; 1947 1948 sc = ifp->if_bridge; 1949 1950 /* 1951 * The packet didnt originate from a member interface. This should only 1952 * ever happen if a member interface is removed while packets are 1953 * queued for it. 1954 */ 1955 if (sc == NULL) { 1956 m_freem(m); 1957 return; 1958 } 1959 1960 if (PFIL_HOOKED(&V_inet_pfil_hook) 1961 #ifdef INET6 1962 || PFIL_HOOKED(&V_inet6_pfil_hook) 1963 #endif 1964 ) { 1965 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 1966 return; 1967 if (m == NULL) 1968 return; 1969 } 1970 1971 bridge_enqueue(sc, ifp, m); 1972 } 1973 1974 /* 1975 * bridge_output: 1976 * 1977 * Send output from a bridge member interface. This 1978 * performs the bridging function for locally originated 1979 * packets. 1980 * 1981 * The mbuf has the Ethernet header already attached. We must 1982 * enqueue or free the mbuf before returning. 1983 */ 1984 static int 1985 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 1986 struct rtentry *rt) 1987 { 1988 struct ether_header *eh; 1989 struct ifnet *dst_if; 1990 struct bridge_softc *sc; 1991 uint16_t vlan; 1992 1993 if (m->m_len < ETHER_HDR_LEN) { 1994 m = m_pullup(m, ETHER_HDR_LEN); 1995 if (m == NULL) 1996 return (0); 1997 } 1998 1999 eh = mtod(m, struct ether_header *); 2000 sc = ifp->if_bridge; 2001 vlan = VLANTAGOF(m); 2002 2003 BRIDGE_LOCK(sc); 2004 2005 /* 2006 * If bridge is down, but the original output interface is up, 2007 * go ahead and send out that interface. Otherwise, the packet 2008 * is dropped below. 2009 */ 2010 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2011 dst_if = ifp; 2012 goto sendunicast; 2013 } 2014 2015 /* 2016 * If the packet is a multicast, or we don't know a better way to 2017 * get there, send to all interfaces. 2018 */ 2019 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 2020 dst_if = NULL; 2021 else 2022 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 2023 if (dst_if == NULL) { 2024 struct bridge_iflist *bif; 2025 struct mbuf *mc; 2026 int error = 0, used = 0; 2027 2028 bridge_span(sc, m); 2029 2030 BRIDGE_LOCK2REF(sc, error); 2031 if (error) { 2032 m_freem(m); 2033 return (0); 2034 } 2035 2036 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2037 dst_if = bif->bif_ifp; 2038 2039 if (dst_if->if_type == IFT_GIF) 2040 continue; 2041 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2042 continue; 2043 2044 /* 2045 * If this is not the original output interface, 2046 * and the interface is participating in spanning 2047 * tree, make sure the port is in a state that 2048 * allows forwarding. 2049 */ 2050 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 2051 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2052 continue; 2053 2054 if (LIST_NEXT(bif, bif_next) == NULL) { 2055 used = 1; 2056 mc = m; 2057 } else { 2058 mc = m_copypacket(m, M_NOWAIT); 2059 if (mc == NULL) { 2060 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2061 continue; 2062 } 2063 } 2064 2065 bridge_enqueue(sc, dst_if, mc); 2066 } 2067 if (used == 0) 2068 m_freem(m); 2069 BRIDGE_UNREF(sc); 2070 return (0); 2071 } 2072 2073 sendunicast: 2074 /* 2075 * XXX Spanning tree consideration here? 2076 */ 2077 2078 bridge_span(sc, m); 2079 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2080 m_freem(m); 2081 BRIDGE_UNLOCK(sc); 2082 return (0); 2083 } 2084 2085 BRIDGE_UNLOCK(sc); 2086 bridge_enqueue(sc, dst_if, m); 2087 return (0); 2088 } 2089 2090 /* 2091 * bridge_transmit: 2092 * 2093 * Do output on a bridge. 2094 * 2095 */ 2096 static int 2097 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2098 { 2099 struct bridge_softc *sc; 2100 struct ether_header *eh; 2101 struct ifnet *dst_if; 2102 int error = 0; 2103 2104 sc = ifp->if_softc; 2105 2106 ETHER_BPF_MTAP(ifp, m); 2107 2108 eh = mtod(m, struct ether_header *); 2109 2110 BRIDGE_LOCK(sc); 2111 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2112 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) { 2113 BRIDGE_UNLOCK(sc); 2114 error = bridge_enqueue(sc, dst_if, m); 2115 } else 2116 bridge_broadcast(sc, ifp, m, 0); 2117 2118 return (error); 2119 } 2120 2121 /* 2122 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2123 */ 2124 static void 2125 bridge_qflush(struct ifnet *ifp __unused) 2126 { 2127 } 2128 2129 /* 2130 * bridge_forward: 2131 * 2132 * The forwarding function of the bridge. 2133 * 2134 * NOTE: Releases the lock on return. 2135 */ 2136 static void 2137 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2138 struct mbuf *m) 2139 { 2140 struct bridge_iflist *dbif; 2141 struct ifnet *src_if, *dst_if, *ifp; 2142 struct ether_header *eh; 2143 uint16_t vlan; 2144 uint8_t *dst; 2145 int error; 2146 2147 src_if = m->m_pkthdr.rcvif; 2148 ifp = sc->sc_ifp; 2149 2150 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 2151 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2152 vlan = VLANTAGOF(m); 2153 2154 if ((sbif->bif_flags & IFBIF_STP) && 2155 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2156 goto drop; 2157 2158 eh = mtod(m, struct ether_header *); 2159 dst = eh->ether_dhost; 2160 2161 /* If the interface is learning, record the address. */ 2162 if (sbif->bif_flags & IFBIF_LEARNING) { 2163 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2164 sbif, 0, IFBAF_DYNAMIC); 2165 /* 2166 * If the interface has addresses limits then deny any source 2167 * that is not in the cache. 2168 */ 2169 if (error && sbif->bif_addrmax) 2170 goto drop; 2171 } 2172 2173 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2174 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2175 goto drop; 2176 2177 /* 2178 * At this point, the port either doesn't participate 2179 * in spanning tree or it is in the forwarding state. 2180 */ 2181 2182 /* 2183 * If the packet is unicast, destined for someone on 2184 * "this" side of the bridge, drop it. 2185 */ 2186 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2187 dst_if = bridge_rtlookup(sc, dst, vlan); 2188 if (src_if == dst_if) 2189 goto drop; 2190 } else { 2191 /* 2192 * Check if its a reserved multicast address, any address 2193 * listed in 802.1D section 7.12.6 may not be forwarded by the 2194 * bridge. 2195 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2196 */ 2197 if (dst[0] == 0x01 && dst[1] == 0x80 && 2198 dst[2] == 0xc2 && dst[3] == 0x00 && 2199 dst[4] == 0x00 && dst[5] <= 0x0f) 2200 goto drop; 2201 2202 /* ...forward it to all interfaces. */ 2203 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 2204 dst_if = NULL; 2205 } 2206 2207 /* 2208 * If we have a destination interface which is a member of our bridge, 2209 * OR this is a unicast packet, push it through the bpf(4) machinery. 2210 * For broadcast or multicast packets, don't bother because it will 2211 * be reinjected into ether_input. We do this before we pass the packets 2212 * through the pfil(9) framework, as it is possible that pfil(9) will 2213 * drop the packet, or possibly modify it, making it difficult to debug 2214 * firewall issues on the bridge. 2215 */ 2216 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2217 ETHER_BPF_MTAP(ifp, m); 2218 2219 /* run the packet filter */ 2220 if (PFIL_HOOKED(&V_inet_pfil_hook) 2221 #ifdef INET6 2222 || PFIL_HOOKED(&V_inet6_pfil_hook) 2223 #endif 2224 ) { 2225 BRIDGE_UNLOCK(sc); 2226 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2227 return; 2228 if (m == NULL) 2229 return; 2230 BRIDGE_LOCK(sc); 2231 } 2232 2233 if (dst_if == NULL) { 2234 bridge_broadcast(sc, src_if, m, 1); 2235 return; 2236 } 2237 2238 /* 2239 * At this point, we're dealing with a unicast frame 2240 * going to a different interface. 2241 */ 2242 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2243 goto drop; 2244 2245 dbif = bridge_lookup_member_if(sc, dst_if); 2246 if (dbif == NULL) 2247 /* Not a member of the bridge (anymore?) */ 2248 goto drop; 2249 2250 /* Private segments can not talk to each other */ 2251 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2252 goto drop; 2253 2254 if ((dbif->bif_flags & IFBIF_STP) && 2255 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2256 goto drop; 2257 2258 BRIDGE_UNLOCK(sc); 2259 2260 if (PFIL_HOOKED(&V_inet_pfil_hook) 2261 #ifdef INET6 2262 || PFIL_HOOKED(&V_inet6_pfil_hook) 2263 #endif 2264 ) { 2265 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2266 return; 2267 if (m == NULL) 2268 return; 2269 } 2270 2271 bridge_enqueue(sc, dst_if, m); 2272 return; 2273 2274 drop: 2275 BRIDGE_UNLOCK(sc); 2276 m_freem(m); 2277 } 2278 2279 /* 2280 * bridge_input: 2281 * 2282 * Receive input from a member interface. Queue the packet for 2283 * bridging if it is not for us. 2284 */ 2285 static struct mbuf * 2286 bridge_input(struct ifnet *ifp, struct mbuf *m) 2287 { 2288 struct bridge_softc *sc = ifp->if_bridge; 2289 struct bridge_iflist *bif, *bif2; 2290 struct ifnet *bifp; 2291 struct ether_header *eh; 2292 struct mbuf *mc, *mc2; 2293 uint16_t vlan; 2294 int error; 2295 2296 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2297 return (m); 2298 2299 bifp = sc->sc_ifp; 2300 vlan = VLANTAGOF(m); 2301 2302 /* 2303 * Implement support for bridge monitoring. If this flag has been 2304 * set on this interface, discard the packet once we push it through 2305 * the bpf(4) machinery, but before we do, increment the byte and 2306 * packet counters associated with this interface. 2307 */ 2308 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2309 m->m_pkthdr.rcvif = bifp; 2310 ETHER_BPF_MTAP(bifp, m); 2311 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); 2312 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2313 m_freem(m); 2314 return (NULL); 2315 } 2316 BRIDGE_LOCK(sc); 2317 bif = bridge_lookup_member_if(sc, ifp); 2318 if (bif == NULL) { 2319 BRIDGE_UNLOCK(sc); 2320 return (m); 2321 } 2322 2323 eh = mtod(m, struct ether_header *); 2324 2325 bridge_span(sc, m); 2326 2327 if (m->m_flags & (M_BCAST|M_MCAST)) { 2328 /* Tap off 802.1D packets; they do not get forwarded. */ 2329 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2330 ETHER_ADDR_LEN) == 0) { 2331 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2332 BRIDGE_UNLOCK(sc); 2333 return (NULL); 2334 } 2335 2336 if ((bif->bif_flags & IFBIF_STP) && 2337 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2338 BRIDGE_UNLOCK(sc); 2339 return (m); 2340 } 2341 2342 /* 2343 * Make a deep copy of the packet and enqueue the copy 2344 * for bridge processing; return the original packet for 2345 * local processing. 2346 */ 2347 mc = m_dup(m, M_NOWAIT); 2348 if (mc == NULL) { 2349 BRIDGE_UNLOCK(sc); 2350 return (m); 2351 } 2352 2353 /* Perform the bridge forwarding function with the copy. */ 2354 bridge_forward(sc, bif, mc); 2355 2356 /* 2357 * Reinject the mbuf as arriving on the bridge so we have a 2358 * chance at claiming multicast packets. We can not loop back 2359 * here from ether_input as a bridge is never a member of a 2360 * bridge. 2361 */ 2362 KASSERT(bifp->if_bridge == NULL, 2363 ("loop created in bridge_input")); 2364 mc2 = m_dup(m, M_NOWAIT); 2365 if (mc2 != NULL) { 2366 /* Keep the layer3 header aligned */ 2367 int i = min(mc2->m_pkthdr.len, max_protohdr); 2368 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2369 } 2370 if (mc2 != NULL) { 2371 mc2->m_pkthdr.rcvif = bifp; 2372 (*bifp->if_input)(bifp, mc2); 2373 } 2374 2375 /* Return the original packet for local processing. */ 2376 return (m); 2377 } 2378 2379 if ((bif->bif_flags & IFBIF_STP) && 2380 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2381 BRIDGE_UNLOCK(sc); 2382 return (m); 2383 } 2384 2385 #if (defined(INET) || defined(INET6)) 2386 # define OR_CARP_CHECK_WE_ARE_DST(iface) \ 2387 || ((iface)->if_carp \ 2388 && (*carp_forus_p)((iface), eh->ether_dhost)) 2389 # define OR_CARP_CHECK_WE_ARE_SRC(iface) \ 2390 || ((iface)->if_carp \ 2391 && (*carp_forus_p)((iface), eh->ether_shost)) 2392 #else 2393 # define OR_CARP_CHECK_WE_ARE_DST(iface) 2394 # define OR_CARP_CHECK_WE_ARE_SRC(iface) 2395 #endif 2396 2397 #ifdef INET6 2398 # define OR_PFIL_HOOKED_INET6 \ 2399 || PFIL_HOOKED(&V_inet6_pfil_hook) 2400 #else 2401 # define OR_PFIL_HOOKED_INET6 2402 #endif 2403 2404 #define GRAB_OUR_PACKETS(iface) \ 2405 if ((iface)->if_type == IFT_GIF) \ 2406 continue; \ 2407 /* It is destined for us. */ \ 2408 if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \ 2409 OR_CARP_CHECK_WE_ARE_DST((iface)) \ 2410 ) { \ 2411 if ((iface)->if_type == IFT_BRIDGE) { \ 2412 ETHER_BPF_MTAP(iface, m); \ 2413 if_inc_counter(iface, IFCOUNTER_IPACKETS, 1); \ 2414 if_inc_counter(iface, IFCOUNTER_IBYTES, m->m_pkthdr.len); \ 2415 /* Filter on the physical interface. */ \ 2416 if (V_pfil_local_phys && \ 2417 (PFIL_HOOKED(&V_inet_pfil_hook) \ 2418 OR_PFIL_HOOKED_INET6)) { \ 2419 if (bridge_pfil(&m, NULL, ifp, \ 2420 PFIL_IN) != 0 || m == NULL) { \ 2421 BRIDGE_UNLOCK(sc); \ 2422 return (NULL); \ 2423 } \ 2424 eh = mtod(m, struct ether_header *); \ 2425 } \ 2426 } \ 2427 if (bif->bif_flags & IFBIF_LEARNING) { \ 2428 error = bridge_rtupdate(sc, eh->ether_shost, \ 2429 vlan, bif, 0, IFBAF_DYNAMIC); \ 2430 if (error && bif->bif_addrmax) { \ 2431 BRIDGE_UNLOCK(sc); \ 2432 m_freem(m); \ 2433 return (NULL); \ 2434 } \ 2435 } \ 2436 m->m_pkthdr.rcvif = iface; \ 2437 BRIDGE_UNLOCK(sc); \ 2438 return (m); \ 2439 } \ 2440 \ 2441 /* We just received a packet that we sent out. */ \ 2442 if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \ 2443 OR_CARP_CHECK_WE_ARE_SRC((iface)) \ 2444 ) { \ 2445 BRIDGE_UNLOCK(sc); \ 2446 m_freem(m); \ 2447 return (NULL); \ 2448 } 2449 2450 /* 2451 * Unicast. Make sure it's not for the bridge. 2452 */ 2453 do { GRAB_OUR_PACKETS(bifp) } while (0); 2454 2455 /* 2456 * Give a chance for ifp at first priority. This will help when the 2457 * packet comes through the interface like VLAN's with the same MACs 2458 * on several interfaces from the same bridge. This also will save 2459 * some CPU cycles in case the destination interface and the input 2460 * interface (eq ifp) are the same. 2461 */ 2462 do { GRAB_OUR_PACKETS(ifp) } while (0); 2463 2464 /* Now check the all bridge members. */ 2465 LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2466 GRAB_OUR_PACKETS(bif2->bif_ifp) 2467 } 2468 2469 #undef OR_CARP_CHECK_WE_ARE_DST 2470 #undef OR_CARP_CHECK_WE_ARE_SRC 2471 #undef OR_PFIL_HOOKED_INET6 2472 #undef GRAB_OUR_PACKETS 2473 2474 /* Perform the bridge forwarding function. */ 2475 bridge_forward(sc, bif, m); 2476 2477 return (NULL); 2478 } 2479 2480 /* 2481 * bridge_broadcast: 2482 * 2483 * Send a frame to all interfaces that are members of 2484 * the bridge, except for the one on which the packet 2485 * arrived. 2486 * 2487 * NOTE: Releases the lock on return. 2488 */ 2489 static void 2490 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2491 struct mbuf *m, int runfilt) 2492 { 2493 struct bridge_iflist *dbif, *sbif; 2494 struct mbuf *mc; 2495 struct ifnet *dst_if; 2496 int error = 0, used = 0, i; 2497 2498 sbif = bridge_lookup_member_if(sc, src_if); 2499 2500 BRIDGE_LOCK2REF(sc, error); 2501 if (error) { 2502 m_freem(m); 2503 return; 2504 } 2505 2506 /* Filter on the bridge interface before broadcasting */ 2507 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2508 #ifdef INET6 2509 || PFIL_HOOKED(&V_inet6_pfil_hook) 2510 #endif 2511 )) { 2512 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2513 goto out; 2514 if (m == NULL) 2515 goto out; 2516 } 2517 2518 LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2519 dst_if = dbif->bif_ifp; 2520 if (dst_if == src_if) 2521 continue; 2522 2523 /* Private segments can not talk to each other */ 2524 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2525 continue; 2526 2527 if ((dbif->bif_flags & IFBIF_STP) && 2528 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2529 continue; 2530 2531 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2532 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2533 continue; 2534 2535 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2536 continue; 2537 2538 if (LIST_NEXT(dbif, bif_next) == NULL) { 2539 mc = m; 2540 used = 1; 2541 } else { 2542 mc = m_dup(m, M_NOWAIT); 2543 if (mc == NULL) { 2544 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2545 continue; 2546 } 2547 } 2548 2549 /* 2550 * Filter on the output interface. Pass a NULL bridge interface 2551 * pointer so we do not redundantly filter on the bridge for 2552 * each interface we broadcast on. 2553 */ 2554 if (runfilt && (PFIL_HOOKED(&V_inet_pfil_hook) 2555 #ifdef INET6 2556 || PFIL_HOOKED(&V_inet6_pfil_hook) 2557 #endif 2558 )) { 2559 if (used == 0) { 2560 /* Keep the layer3 header aligned */ 2561 i = min(mc->m_pkthdr.len, max_protohdr); 2562 mc = m_copyup(mc, i, ETHER_ALIGN); 2563 if (mc == NULL) { 2564 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2565 continue; 2566 } 2567 } 2568 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2569 continue; 2570 if (mc == NULL) 2571 continue; 2572 } 2573 2574 bridge_enqueue(sc, dst_if, mc); 2575 } 2576 if (used == 0) 2577 m_freem(m); 2578 2579 out: 2580 BRIDGE_UNREF(sc); 2581 } 2582 2583 /* 2584 * bridge_span: 2585 * 2586 * Duplicate a packet out one or more interfaces that are in span mode, 2587 * the original mbuf is unmodified. 2588 */ 2589 static void 2590 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2591 { 2592 struct bridge_iflist *bif; 2593 struct ifnet *dst_if; 2594 struct mbuf *mc; 2595 2596 if (LIST_EMPTY(&sc->sc_spanlist)) 2597 return; 2598 2599 LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2600 dst_if = bif->bif_ifp; 2601 2602 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2603 continue; 2604 2605 mc = m_copypacket(m, M_NOWAIT); 2606 if (mc == NULL) { 2607 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2608 continue; 2609 } 2610 2611 bridge_enqueue(sc, dst_if, mc); 2612 } 2613 } 2614 2615 /* 2616 * bridge_rtupdate: 2617 * 2618 * Add a bridge routing entry. 2619 */ 2620 static int 2621 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2622 struct bridge_iflist *bif, int setflags, uint8_t flags) 2623 { 2624 struct bridge_rtnode *brt; 2625 int error; 2626 2627 BRIDGE_LOCK_ASSERT(sc); 2628 2629 /* Check the source address is valid and not multicast. */ 2630 if (ETHER_IS_MULTICAST(dst) || 2631 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2632 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2633 return (EINVAL); 2634 2635 /* 802.1p frames map to vlan 1 */ 2636 if (vlan == 0) 2637 vlan = 1; 2638 2639 /* 2640 * A route for this destination might already exist. If so, 2641 * update it, otherwise create a new one. 2642 */ 2643 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2644 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2645 sc->sc_brtexceeded++; 2646 return (ENOSPC); 2647 } 2648 /* Check per interface address limits (if enabled) */ 2649 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2650 bif->bif_addrexceeded++; 2651 return (ENOSPC); 2652 } 2653 2654 /* 2655 * Allocate a new bridge forwarding node, and 2656 * initialize the expiration time and Ethernet 2657 * address. 2658 */ 2659 brt = uma_zalloc(bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2660 if (brt == NULL) 2661 return (ENOMEM); 2662 2663 if (bif->bif_flags & IFBIF_STICKY) 2664 brt->brt_flags = IFBAF_STICKY; 2665 else 2666 brt->brt_flags = IFBAF_DYNAMIC; 2667 2668 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2669 brt->brt_vlan = vlan; 2670 2671 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2672 uma_zfree(bridge_rtnode_zone, brt); 2673 return (error); 2674 } 2675 brt->brt_dst = bif; 2676 bif->bif_addrcnt++; 2677 } 2678 2679 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2680 brt->brt_dst != bif) { 2681 brt->brt_dst->bif_addrcnt--; 2682 brt->brt_dst = bif; 2683 brt->brt_dst->bif_addrcnt++; 2684 } 2685 2686 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2687 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2688 if (setflags) 2689 brt->brt_flags = flags; 2690 2691 return (0); 2692 } 2693 2694 /* 2695 * bridge_rtlookup: 2696 * 2697 * Lookup the destination interface for an address. 2698 */ 2699 static struct ifnet * 2700 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2701 { 2702 struct bridge_rtnode *brt; 2703 2704 BRIDGE_LOCK_ASSERT(sc); 2705 2706 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2707 return (NULL); 2708 2709 return (brt->brt_ifp); 2710 } 2711 2712 /* 2713 * bridge_rttrim: 2714 * 2715 * Trim the routine table so that we have a number 2716 * of routing entries less than or equal to the 2717 * maximum number. 2718 */ 2719 static void 2720 bridge_rttrim(struct bridge_softc *sc) 2721 { 2722 struct bridge_rtnode *brt, *nbrt; 2723 2724 BRIDGE_LOCK_ASSERT(sc); 2725 2726 /* Make sure we actually need to do this. */ 2727 if (sc->sc_brtcnt <= sc->sc_brtmax) 2728 return; 2729 2730 /* Force an aging cycle; this might trim enough addresses. */ 2731 bridge_rtage(sc); 2732 if (sc->sc_brtcnt <= sc->sc_brtmax) 2733 return; 2734 2735 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2736 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2737 bridge_rtnode_destroy(sc, brt); 2738 if (sc->sc_brtcnt <= sc->sc_brtmax) 2739 return; 2740 } 2741 } 2742 } 2743 2744 /* 2745 * bridge_timer: 2746 * 2747 * Aging timer for the bridge. 2748 */ 2749 static void 2750 bridge_timer(void *arg) 2751 { 2752 struct bridge_softc *sc = arg; 2753 2754 BRIDGE_LOCK_ASSERT(sc); 2755 2756 bridge_rtage(sc); 2757 2758 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2759 callout_reset(&sc->sc_brcallout, 2760 bridge_rtable_prune_period * hz, bridge_timer, sc); 2761 } 2762 2763 /* 2764 * bridge_rtage: 2765 * 2766 * Perform an aging cycle. 2767 */ 2768 static void 2769 bridge_rtage(struct bridge_softc *sc) 2770 { 2771 struct bridge_rtnode *brt, *nbrt; 2772 2773 BRIDGE_LOCK_ASSERT(sc); 2774 2775 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2776 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2777 if (time_uptime >= brt->brt_expire) 2778 bridge_rtnode_destroy(sc, brt); 2779 } 2780 } 2781 } 2782 2783 /* 2784 * bridge_rtflush: 2785 * 2786 * Remove all dynamic addresses from the bridge. 2787 */ 2788 static void 2789 bridge_rtflush(struct bridge_softc *sc, int full) 2790 { 2791 struct bridge_rtnode *brt, *nbrt; 2792 2793 BRIDGE_LOCK_ASSERT(sc); 2794 2795 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2796 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2797 bridge_rtnode_destroy(sc, brt); 2798 } 2799 } 2800 2801 /* 2802 * bridge_rtdaddr: 2803 * 2804 * Remove an address from the table. 2805 */ 2806 static int 2807 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2808 { 2809 struct bridge_rtnode *brt; 2810 int found = 0; 2811 2812 BRIDGE_LOCK_ASSERT(sc); 2813 2814 /* 2815 * If vlan is zero then we want to delete for all vlans so the lookup 2816 * may return more than one. 2817 */ 2818 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2819 bridge_rtnode_destroy(sc, brt); 2820 found = 1; 2821 } 2822 2823 return (found ? 0 : ENOENT); 2824 } 2825 2826 /* 2827 * bridge_rtdelete: 2828 * 2829 * Delete routes to a speicifc member interface. 2830 */ 2831 static void 2832 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 2833 { 2834 struct bridge_rtnode *brt, *nbrt; 2835 2836 BRIDGE_LOCK_ASSERT(sc); 2837 2838 LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2839 if (brt->brt_ifp == ifp && (full || 2840 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 2841 bridge_rtnode_destroy(sc, brt); 2842 } 2843 } 2844 2845 /* 2846 * bridge_rtable_init: 2847 * 2848 * Initialize the route table for this bridge. 2849 */ 2850 static void 2851 bridge_rtable_init(struct bridge_softc *sc) 2852 { 2853 int i; 2854 2855 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 2856 M_DEVBUF, M_WAITOK); 2857 2858 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 2859 LIST_INIT(&sc->sc_rthash[i]); 2860 2861 sc->sc_rthash_key = arc4random(); 2862 LIST_INIT(&sc->sc_rtlist); 2863 } 2864 2865 /* 2866 * bridge_rtable_fini: 2867 * 2868 * Deconstruct the route table for this bridge. 2869 */ 2870 static void 2871 bridge_rtable_fini(struct bridge_softc *sc) 2872 { 2873 2874 KASSERT(sc->sc_brtcnt == 0, 2875 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 2876 free(sc->sc_rthash, M_DEVBUF); 2877 } 2878 2879 /* 2880 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 2881 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 2882 */ 2883 #define mix(a, b, c) \ 2884 do { \ 2885 a -= b; a -= c; a ^= (c >> 13); \ 2886 b -= c; b -= a; b ^= (a << 8); \ 2887 c -= a; c -= b; c ^= (b >> 13); \ 2888 a -= b; a -= c; a ^= (c >> 12); \ 2889 b -= c; b -= a; b ^= (a << 16); \ 2890 c -= a; c -= b; c ^= (b >> 5); \ 2891 a -= b; a -= c; a ^= (c >> 3); \ 2892 b -= c; b -= a; b ^= (a << 10); \ 2893 c -= a; c -= b; c ^= (b >> 15); \ 2894 } while (/*CONSTCOND*/0) 2895 2896 static __inline uint32_t 2897 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 2898 { 2899 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 2900 2901 b += addr[5] << 8; 2902 b += addr[4]; 2903 a += addr[3] << 24; 2904 a += addr[2] << 16; 2905 a += addr[1] << 8; 2906 a += addr[0]; 2907 2908 mix(a, b, c); 2909 2910 return (c & BRIDGE_RTHASH_MASK); 2911 } 2912 2913 #undef mix 2914 2915 static int 2916 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 2917 { 2918 int i, d; 2919 2920 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 2921 d = ((int)a[i]) - ((int)b[i]); 2922 } 2923 2924 return (d); 2925 } 2926 2927 /* 2928 * bridge_rtnode_lookup: 2929 * 2930 * Look up a bridge route node for the specified destination. Compare the 2931 * vlan id or if zero then just return the first match. 2932 */ 2933 static struct bridge_rtnode * 2934 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2935 { 2936 struct bridge_rtnode *brt; 2937 uint32_t hash; 2938 int dir; 2939 2940 BRIDGE_LOCK_ASSERT(sc); 2941 2942 hash = bridge_rthash(sc, addr); 2943 LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 2944 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 2945 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 2946 return (brt); 2947 if (dir > 0) 2948 return (NULL); 2949 } 2950 2951 return (NULL); 2952 } 2953 2954 /* 2955 * bridge_rtnode_insert: 2956 * 2957 * Insert the specified bridge node into the route table. We 2958 * assume the entry is not already in the table. 2959 */ 2960 static int 2961 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 2962 { 2963 struct bridge_rtnode *lbrt; 2964 uint32_t hash; 2965 int dir; 2966 2967 BRIDGE_LOCK_ASSERT(sc); 2968 2969 hash = bridge_rthash(sc, brt->brt_addr); 2970 2971 lbrt = LIST_FIRST(&sc->sc_rthash[hash]); 2972 if (lbrt == NULL) { 2973 LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 2974 goto out; 2975 } 2976 2977 do { 2978 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 2979 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 2980 return (EEXIST); 2981 if (dir > 0) { 2982 LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 2983 goto out; 2984 } 2985 if (LIST_NEXT(lbrt, brt_hash) == NULL) { 2986 LIST_INSERT_AFTER(lbrt, brt, brt_hash); 2987 goto out; 2988 } 2989 lbrt = LIST_NEXT(lbrt, brt_hash); 2990 } while (lbrt != NULL); 2991 2992 #ifdef DIAGNOSTIC 2993 panic("bridge_rtnode_insert: impossible"); 2994 #endif 2995 2996 out: 2997 LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 2998 sc->sc_brtcnt++; 2999 3000 return (0); 3001 } 3002 3003 /* 3004 * bridge_rtnode_destroy: 3005 * 3006 * Destroy a bridge rtnode. 3007 */ 3008 static void 3009 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 3010 { 3011 BRIDGE_LOCK_ASSERT(sc); 3012 3013 LIST_REMOVE(brt, brt_hash); 3014 3015 LIST_REMOVE(brt, brt_list); 3016 sc->sc_brtcnt--; 3017 brt->brt_dst->bif_addrcnt--; 3018 uma_zfree(bridge_rtnode_zone, brt); 3019 } 3020 3021 /* 3022 * bridge_rtable_expire: 3023 * 3024 * Set the expiry time for all routes on an interface. 3025 */ 3026 static void 3027 bridge_rtable_expire(struct ifnet *ifp, int age) 3028 { 3029 struct bridge_softc *sc = ifp->if_bridge; 3030 struct bridge_rtnode *brt; 3031 3032 BRIDGE_LOCK(sc); 3033 3034 /* 3035 * If the age is zero then flush, otherwise set all the expiry times to 3036 * age for the interface 3037 */ 3038 if (age == 0) 3039 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 3040 else { 3041 LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 3042 /* Cap the expiry time to 'age' */ 3043 if (brt->brt_ifp == ifp && 3044 brt->brt_expire > time_uptime + age && 3045 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3046 brt->brt_expire = time_uptime + age; 3047 } 3048 } 3049 BRIDGE_UNLOCK(sc); 3050 } 3051 3052 /* 3053 * bridge_state_change: 3054 * 3055 * Callback from the bridgestp code when a port changes states. 3056 */ 3057 static void 3058 bridge_state_change(struct ifnet *ifp, int state) 3059 { 3060 struct bridge_softc *sc = ifp->if_bridge; 3061 static const char *stpstates[] = { 3062 "disabled", 3063 "listening", 3064 "learning", 3065 "forwarding", 3066 "blocking", 3067 "discarding" 3068 }; 3069 3070 CURVNET_SET(ifp->if_vnet); 3071 if (V_log_stp) 3072 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3073 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3074 CURVNET_RESTORE(); 3075 } 3076 3077 /* 3078 * Send bridge packets through pfil if they are one of the types pfil can deal 3079 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3080 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3081 * that interface. 3082 */ 3083 static int 3084 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3085 { 3086 int snap, error, i, hlen; 3087 struct ether_header *eh1, eh2; 3088 struct ip *ip; 3089 struct llc llc1; 3090 u_int16_t ether_type; 3091 3092 snap = 0; 3093 error = -1; /* Default error if not error == 0 */ 3094 3095 #if 0 3096 /* we may return with the IP fields swapped, ensure its not shared */ 3097 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3098 #endif 3099 3100 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0) 3101 return (0); /* filtering is disabled */ 3102 3103 i = min((*mp)->m_pkthdr.len, max_protohdr); 3104 if ((*mp)->m_len < i) { 3105 *mp = m_pullup(*mp, i); 3106 if (*mp == NULL) { 3107 printf("%s: m_pullup failed\n", __func__); 3108 return (-1); 3109 } 3110 } 3111 3112 eh1 = mtod(*mp, struct ether_header *); 3113 ether_type = ntohs(eh1->ether_type); 3114 3115 /* 3116 * Check for SNAP/LLC. 3117 */ 3118 if (ether_type < ETHERMTU) { 3119 struct llc *llc2 = (struct llc *)(eh1 + 1); 3120 3121 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3122 llc2->llc_dsap == LLC_SNAP_LSAP && 3123 llc2->llc_ssap == LLC_SNAP_LSAP && 3124 llc2->llc_control == LLC_UI) { 3125 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3126 snap = 1; 3127 } 3128 } 3129 3130 /* 3131 * If we're trying to filter bridge traffic, don't look at anything 3132 * other than IP and ARP traffic. If the filter doesn't understand 3133 * IPv6, don't allow IPv6 through the bridge either. This is lame 3134 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3135 * but of course we don't have an AppleTalk filter to begin with. 3136 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3137 * ARP traffic.) 3138 */ 3139 switch (ether_type) { 3140 case ETHERTYPE_ARP: 3141 case ETHERTYPE_REVARP: 3142 if (V_pfil_ipfw_arp == 0) 3143 return (0); /* Automatically pass */ 3144 break; 3145 3146 case ETHERTYPE_IP: 3147 #ifdef INET6 3148 case ETHERTYPE_IPV6: 3149 #endif /* INET6 */ 3150 break; 3151 default: 3152 /* 3153 * Check to see if the user wants to pass non-ip 3154 * packets, these will not be checked by pfil(9) and 3155 * passed unconditionally so the default is to drop. 3156 */ 3157 if (V_pfil_onlyip) 3158 goto bad; 3159 } 3160 3161 /* Run the packet through pfil before stripping link headers */ 3162 if (PFIL_HOOKED(&V_link_pfil_hook) && V_pfil_ipfw != 0 && 3163 dir == PFIL_OUT && ifp != NULL) { 3164 3165 error = pfil_run_hooks(&V_link_pfil_hook, mp, ifp, dir, NULL); 3166 3167 if (*mp == NULL || error != 0) /* packet consumed by filter */ 3168 return (error); 3169 } 3170 3171 /* Strip off the Ethernet header and keep a copy. */ 3172 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3173 m_adj(*mp, ETHER_HDR_LEN); 3174 3175 /* Strip off snap header, if present */ 3176 if (snap) { 3177 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3178 m_adj(*mp, sizeof(struct llc)); 3179 } 3180 3181 /* 3182 * Check the IP header for alignment and errors 3183 */ 3184 if (dir == PFIL_IN) { 3185 switch (ether_type) { 3186 case ETHERTYPE_IP: 3187 error = bridge_ip_checkbasic(mp); 3188 break; 3189 #ifdef INET6 3190 case ETHERTYPE_IPV6: 3191 error = bridge_ip6_checkbasic(mp); 3192 break; 3193 #endif /* INET6 */ 3194 default: 3195 error = 0; 3196 } 3197 if (error) 3198 goto bad; 3199 } 3200 3201 error = 0; 3202 3203 /* 3204 * Run the packet through pfil 3205 */ 3206 switch (ether_type) { 3207 case ETHERTYPE_IP: 3208 /* 3209 * Run pfil on the member interface and the bridge, both can 3210 * be skipped by clearing pfil_member or pfil_bridge. 3211 * 3212 * Keep the order: 3213 * in_if -> bridge_if -> out_if 3214 */ 3215 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3216 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3217 dir, NULL); 3218 3219 if (*mp == NULL || error != 0) /* filter may consume */ 3220 break; 3221 3222 if (V_pfil_member && ifp != NULL) 3223 error = pfil_run_hooks(&V_inet_pfil_hook, mp, ifp, 3224 dir, NULL); 3225 3226 if (*mp == NULL || error != 0) /* filter may consume */ 3227 break; 3228 3229 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL) 3230 error = pfil_run_hooks(&V_inet_pfil_hook, mp, bifp, 3231 dir, NULL); 3232 3233 if (*mp == NULL || error != 0) /* filter may consume */ 3234 break; 3235 3236 /* check if we need to fragment the packet */ 3237 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) { 3238 i = (*mp)->m_pkthdr.len; 3239 if (i > ifp->if_mtu) { 3240 error = bridge_fragment(ifp, *mp, &eh2, snap, 3241 &llc1); 3242 return (error); 3243 } 3244 } 3245 3246 /* Recalculate the ip checksum. */ 3247 ip = mtod(*mp, struct ip *); 3248 hlen = ip->ip_hl << 2; 3249 if (hlen < sizeof(struct ip)) 3250 goto bad; 3251 if (hlen > (*mp)->m_len) { 3252 if ((*mp = m_pullup(*mp, hlen)) == NULL) 3253 goto bad; 3254 ip = mtod(*mp, struct ip *); 3255 if (ip == NULL) 3256 goto bad; 3257 } 3258 ip->ip_sum = 0; 3259 if (hlen == sizeof(struct ip)) 3260 ip->ip_sum = in_cksum_hdr(ip); 3261 else 3262 ip->ip_sum = in_cksum(*mp, hlen); 3263 3264 break; 3265 #ifdef INET6 3266 case ETHERTYPE_IPV6: 3267 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL) 3268 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3269 dir, NULL); 3270 3271 if (*mp == NULL || error != 0) /* filter may consume */ 3272 break; 3273 3274 if (V_pfil_member && ifp != NULL) 3275 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, ifp, 3276 dir, NULL); 3277 3278 if (*mp == NULL || error != 0) /* filter may consume */ 3279 break; 3280 3281 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL) 3282 error = pfil_run_hooks(&V_inet6_pfil_hook, mp, bifp, 3283 dir, NULL); 3284 break; 3285 #endif 3286 default: 3287 error = 0; 3288 break; 3289 } 3290 3291 if (*mp == NULL) 3292 return (error); 3293 if (error != 0) 3294 goto bad; 3295 3296 error = -1; 3297 3298 /* 3299 * Finally, put everything back the way it was and return 3300 */ 3301 if (snap) { 3302 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 3303 if (*mp == NULL) 3304 return (error); 3305 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3306 } 3307 3308 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 3309 if (*mp == NULL) 3310 return (error); 3311 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3312 3313 return (0); 3314 3315 bad: 3316 m_freem(*mp); 3317 *mp = NULL; 3318 return (error); 3319 } 3320 3321 /* 3322 * Perform basic checks on header size since 3323 * pfil assumes ip_input has already processed 3324 * it for it. Cut-and-pasted from ip_input.c. 3325 * Given how simple the IPv6 version is, 3326 * does the IPv4 version really need to be 3327 * this complicated? 3328 * 3329 * XXX Should we update ipstat here, or not? 3330 * XXX Right now we update ipstat but not 3331 * XXX csum_counter. 3332 */ 3333 static int 3334 bridge_ip_checkbasic(struct mbuf **mp) 3335 { 3336 struct mbuf *m = *mp; 3337 struct ip *ip; 3338 int len, hlen; 3339 u_short sum; 3340 3341 if (*mp == NULL) 3342 return (-1); 3343 3344 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3345 if ((m = m_copyup(m, sizeof(struct ip), 3346 (max_linkhdr + 3) & ~3)) == NULL) { 3347 /* XXXJRT new stat, please */ 3348 KMOD_IPSTAT_INC(ips_toosmall); 3349 goto bad; 3350 } 3351 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3352 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3353 KMOD_IPSTAT_INC(ips_toosmall); 3354 goto bad; 3355 } 3356 } 3357 ip = mtod(m, struct ip *); 3358 if (ip == NULL) goto bad; 3359 3360 if (ip->ip_v != IPVERSION) { 3361 KMOD_IPSTAT_INC(ips_badvers); 3362 goto bad; 3363 } 3364 hlen = ip->ip_hl << 2; 3365 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3366 KMOD_IPSTAT_INC(ips_badhlen); 3367 goto bad; 3368 } 3369 if (hlen > m->m_len) { 3370 if ((m = m_pullup(m, hlen)) == NULL) { 3371 KMOD_IPSTAT_INC(ips_badhlen); 3372 goto bad; 3373 } 3374 ip = mtod(m, struct ip *); 3375 if (ip == NULL) goto bad; 3376 } 3377 3378 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3379 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3380 } else { 3381 if (hlen == sizeof(struct ip)) { 3382 sum = in_cksum_hdr(ip); 3383 } else { 3384 sum = in_cksum(m, hlen); 3385 } 3386 } 3387 if (sum) { 3388 KMOD_IPSTAT_INC(ips_badsum); 3389 goto bad; 3390 } 3391 3392 /* Retrieve the packet length. */ 3393 len = ntohs(ip->ip_len); 3394 3395 /* 3396 * Check for additional length bogosity 3397 */ 3398 if (len < hlen) { 3399 KMOD_IPSTAT_INC(ips_badlen); 3400 goto bad; 3401 } 3402 3403 /* 3404 * Check that the amount of data in the buffers 3405 * is as at least much as the IP header would have us expect. 3406 * Drop packet if shorter than we expect. 3407 */ 3408 if (m->m_pkthdr.len < len) { 3409 KMOD_IPSTAT_INC(ips_tooshort); 3410 goto bad; 3411 } 3412 3413 /* Checks out, proceed */ 3414 *mp = m; 3415 return (0); 3416 3417 bad: 3418 *mp = m; 3419 return (-1); 3420 } 3421 3422 #ifdef INET6 3423 /* 3424 * Same as above, but for IPv6. 3425 * Cut-and-pasted from ip6_input.c. 3426 * XXX Should we update ip6stat, or not? 3427 */ 3428 static int 3429 bridge_ip6_checkbasic(struct mbuf **mp) 3430 { 3431 struct mbuf *m = *mp; 3432 struct ip6_hdr *ip6; 3433 3434 /* 3435 * If the IPv6 header is not aligned, slurp it up into a new 3436 * mbuf with space for link headers, in the event we forward 3437 * it. Otherwise, if it is aligned, make sure the entire base 3438 * IPv6 header is in the first mbuf of the chain. 3439 */ 3440 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3441 struct ifnet *inifp = m->m_pkthdr.rcvif; 3442 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3443 (max_linkhdr + 3) & ~3)) == NULL) { 3444 /* XXXJRT new stat, please */ 3445 IP6STAT_INC(ip6s_toosmall); 3446 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3447 goto bad; 3448 } 3449 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3450 struct ifnet *inifp = m->m_pkthdr.rcvif; 3451 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3452 IP6STAT_INC(ip6s_toosmall); 3453 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3454 goto bad; 3455 } 3456 } 3457 3458 ip6 = mtod(m, struct ip6_hdr *); 3459 3460 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3461 IP6STAT_INC(ip6s_badvers); 3462 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3463 goto bad; 3464 } 3465 3466 /* Checks out, proceed */ 3467 *mp = m; 3468 return (0); 3469 3470 bad: 3471 *mp = m; 3472 return (-1); 3473 } 3474 #endif /* INET6 */ 3475 3476 /* 3477 * bridge_fragment: 3478 * 3479 * Return a fragmented mbuf chain. 3480 */ 3481 static int 3482 bridge_fragment(struct ifnet *ifp, struct mbuf *m, struct ether_header *eh, 3483 int snap, struct llc *llc) 3484 { 3485 struct mbuf *m0; 3486 struct ip *ip; 3487 int error = -1; 3488 3489 if (m->m_len < sizeof(struct ip) && 3490 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3491 goto out; 3492 ip = mtod(m, struct ip *); 3493 3494 m->m_pkthdr.csum_flags |= CSUM_IP; 3495 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 3496 if (error) 3497 goto out; 3498 3499 /* walk the chain and re-add the Ethernet header */ 3500 for (m0 = m; m0; m0 = m0->m_nextpkt) { 3501 if (error == 0) { 3502 if (snap) { 3503 M_PREPEND(m0, sizeof(struct llc), M_NOWAIT); 3504 if (m0 == NULL) { 3505 error = ENOBUFS; 3506 continue; 3507 } 3508 bcopy(llc, mtod(m0, caddr_t), 3509 sizeof(struct llc)); 3510 } 3511 M_PREPEND(m0, ETHER_HDR_LEN, M_NOWAIT); 3512 if (m0 == NULL) { 3513 error = ENOBUFS; 3514 continue; 3515 } 3516 bcopy(eh, mtod(m0, caddr_t), ETHER_HDR_LEN); 3517 } else 3518 m_freem(m); 3519 } 3520 3521 if (error == 0) 3522 KMOD_IPSTAT_INC(ips_fragmented); 3523 3524 return (error); 3525 3526 out: 3527 if (m != NULL) 3528 m_freem(m); 3529 return (error); 3530 } 3531 3532 static void 3533 bridge_linkstate(struct ifnet *ifp) 3534 { 3535 struct bridge_softc *sc = ifp->if_bridge; 3536 struct bridge_iflist *bif; 3537 3538 BRIDGE_LOCK(sc); 3539 bif = bridge_lookup_member_if(sc, ifp); 3540 if (bif == NULL) { 3541 BRIDGE_UNLOCK(sc); 3542 return; 3543 } 3544 bridge_linkcheck(sc); 3545 BRIDGE_UNLOCK(sc); 3546 3547 bstp_linkstate(&bif->bif_stp); 3548 } 3549 3550 static void 3551 bridge_linkcheck(struct bridge_softc *sc) 3552 { 3553 struct bridge_iflist *bif; 3554 int new_link, hasls; 3555 3556 BRIDGE_LOCK_ASSERT(sc); 3557 new_link = LINK_STATE_DOWN; 3558 hasls = 0; 3559 /* Our link is considered up if at least one of our ports is active */ 3560 LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3561 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3562 hasls++; 3563 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3564 new_link = LINK_STATE_UP; 3565 break; 3566 } 3567 } 3568 if (!LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3569 /* If no interfaces support link-state then we default to up */ 3570 new_link = LINK_STATE_UP; 3571 } 3572 if_link_state_change(sc->sc_ifp, new_link); 3573 } 3574