1 /* $NetBSD: if_bridge.c,v 1.31 2005/06/01 19:45:34 jdc Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-4-Clause 5 * 6 * Copyright 2001 Wasabi Systems, Inc. 7 * All rights reserved. 8 * 9 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed for the NetBSD Project by 22 * Wasabi Systems, Inc. 23 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 24 * or promote products derived from this software without specific prior 25 * written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) 42 * All rights reserved. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 54 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 55 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 56 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 57 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 58 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 59 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 61 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 62 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 63 * POSSIBILITY OF SUCH DAMAGE. 64 * 65 * OpenBSD: if_bridge.c,v 1.60 2001/06/15 03:38:33 itojun Exp 66 */ 67 68 /* 69 * Network interface bridge support. 70 * 71 * TODO: 72 * 73 * - Currently only supports Ethernet-like interfaces (Ethernet, 74 * 802.11, VLANs on Ethernet, etc.) Figure out a nice way 75 * to bridge other types of interfaces (maybe consider 76 * heterogeneous bridges). 77 */ 78 79 #include <sys/cdefs.h> 80 __FBSDID("$FreeBSD$"); 81 82 #include "opt_inet.h" 83 #include "opt_inet6.h" 84 85 #include <sys/param.h> 86 #include <sys/eventhandler.h> 87 #include <sys/mbuf.h> 88 #include <sys/malloc.h> 89 #include <sys/protosw.h> 90 #include <sys/systm.h> 91 #include <sys/jail.h> 92 #include <sys/time.h> 93 #include <sys/socket.h> /* for net/if.h */ 94 #include <sys/sockio.h> 95 #include <sys/ctype.h> /* string functions */ 96 #include <sys/kernel.h> 97 #include <sys/random.h> 98 #include <sys/syslog.h> 99 #include <sys/sysctl.h> 100 #include <vm/uma.h> 101 #include <sys/module.h> 102 #include <sys/priv.h> 103 #include <sys/proc.h> 104 #include <sys/lock.h> 105 #include <sys/mutex.h> 106 107 #include <net/bpf.h> 108 #include <net/if.h> 109 #include <net/if_clone.h> 110 #include <net/if_dl.h> 111 #include <net/if_types.h> 112 #include <net/if_var.h> 113 #include <net/if_private.h> 114 #include <net/pfil.h> 115 #include <net/vnet.h> 116 117 #include <netinet/in.h> 118 #include <netinet/in_systm.h> 119 #include <netinet/in_var.h> 120 #include <netinet/ip.h> 121 #include <netinet/ip_var.h> 122 #ifdef INET6 123 #include <netinet/ip6.h> 124 #include <netinet6/ip6_var.h> 125 #include <netinet6/in6_ifattach.h> 126 #endif 127 #if defined(INET) || defined(INET6) 128 #include <netinet/ip_carp.h> 129 #endif 130 #include <machine/in_cksum.h> 131 #include <netinet/if_ether.h> 132 #include <net/bridgestp.h> 133 #include <net/if_bridgevar.h> 134 #include <net/if_llc.h> 135 #include <net/if_vlan_var.h> 136 137 #include <net/route.h> 138 139 /* 140 * Size of the route hash table. Must be a power of two. 141 */ 142 #ifndef BRIDGE_RTHASH_SIZE 143 #define BRIDGE_RTHASH_SIZE 1024 144 #endif 145 146 #define BRIDGE_RTHASH_MASK (BRIDGE_RTHASH_SIZE - 1) 147 148 /* 149 * Default maximum number of addresses to cache. 150 */ 151 #ifndef BRIDGE_RTABLE_MAX 152 #define BRIDGE_RTABLE_MAX 2000 153 #endif 154 155 /* 156 * Timeout (in seconds) for entries learned dynamically. 157 */ 158 #ifndef BRIDGE_RTABLE_TIMEOUT 159 #define BRIDGE_RTABLE_TIMEOUT (20 * 60) /* same as ARP */ 160 #endif 161 162 /* 163 * Number of seconds between walks of the route list. 164 */ 165 #ifndef BRIDGE_RTABLE_PRUNE_PERIOD 166 #define BRIDGE_RTABLE_PRUNE_PERIOD (5 * 60) 167 #endif 168 169 /* 170 * List of capabilities to possibly mask on the member interface. 171 */ 172 #define BRIDGE_IFCAPS_MASK (IFCAP_TOE|IFCAP_TSO|IFCAP_TXCSUM|\ 173 IFCAP_TXCSUM_IPV6) 174 175 /* 176 * List of capabilities to strip 177 */ 178 #define BRIDGE_IFCAPS_STRIP IFCAP_LRO 179 180 /* 181 * Bridge locking 182 * 183 * The bridge relies heavily on the epoch(9) system to protect its data 184 * structures. This means we can safely use CK_LISTs while in NET_EPOCH, but we 185 * must ensure there is only one writer at a time. 186 * 187 * That is: for read accesses we only need to be in NET_EPOCH, but for write 188 * accesses we must hold: 189 * 190 * - BRIDGE_RT_LOCK, for any change to bridge_rtnodes 191 * - BRIDGE_LOCK, for any other change 192 * 193 * The BRIDGE_LOCK is a sleepable lock, because it is held across ioctl() 194 * calls to bridge member interfaces and these ioctl()s can sleep. 195 * The BRIDGE_RT_LOCK is a non-sleepable mutex, because it is sometimes 196 * required while we're in NET_EPOCH and then we're not allowed to sleep. 197 */ 198 #define BRIDGE_LOCK_INIT(_sc) do { \ 199 sx_init(&(_sc)->sc_sx, "if_bridge"); \ 200 mtx_init(&(_sc)->sc_rt_mtx, "if_bridge rt", NULL, MTX_DEF); \ 201 } while (0) 202 #define BRIDGE_LOCK_DESTROY(_sc) do { \ 203 sx_destroy(&(_sc)->sc_sx); \ 204 mtx_destroy(&(_sc)->sc_rt_mtx); \ 205 } while (0) 206 #define BRIDGE_LOCK(_sc) sx_xlock(&(_sc)->sc_sx) 207 #define BRIDGE_UNLOCK(_sc) sx_xunlock(&(_sc)->sc_sx) 208 #define BRIDGE_LOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_XLOCKED) 209 #define BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 210 MPASS(in_epoch(net_epoch_preempt) || sx_xlocked(&(_sc)->sc_sx)) 211 #define BRIDGE_UNLOCK_ASSERT(_sc) sx_assert(&(_sc)->sc_sx, SX_UNLOCKED) 212 #define BRIDGE_RT_LOCK(_sc) mtx_lock(&(_sc)->sc_rt_mtx) 213 #define BRIDGE_RT_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_rt_mtx) 214 #define BRIDGE_RT_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->sc_rt_mtx, MA_OWNED) 215 #define BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(_sc) \ 216 MPASS(in_epoch(net_epoch_preempt) || mtx_owned(&(_sc)->sc_rt_mtx)) 217 218 /* 219 * Bridge interface list entry. 220 */ 221 struct bridge_iflist { 222 CK_LIST_ENTRY(bridge_iflist) bif_next; 223 struct ifnet *bif_ifp; /* member if */ 224 struct bstp_port bif_stp; /* STP state */ 225 uint32_t bif_flags; /* member if flags */ 226 int bif_savedcaps; /* saved capabilities */ 227 uint32_t bif_addrmax; /* max # of addresses */ 228 uint32_t bif_addrcnt; /* cur. # of addresses */ 229 uint32_t bif_addrexceeded;/* # of address violations */ 230 struct epoch_context bif_epoch_ctx; 231 }; 232 233 /* 234 * Bridge route node. 235 */ 236 struct bridge_rtnode { 237 CK_LIST_ENTRY(bridge_rtnode) brt_hash; /* hash table linkage */ 238 CK_LIST_ENTRY(bridge_rtnode) brt_list; /* list linkage */ 239 struct bridge_iflist *brt_dst; /* destination if */ 240 unsigned long brt_expire; /* expiration time */ 241 uint8_t brt_flags; /* address flags */ 242 uint8_t brt_addr[ETHER_ADDR_LEN]; 243 uint16_t brt_vlan; /* vlan id */ 244 struct vnet *brt_vnet; 245 struct epoch_context brt_epoch_ctx; 246 }; 247 #define brt_ifp brt_dst->bif_ifp 248 249 /* 250 * Software state for each bridge. 251 */ 252 struct bridge_softc { 253 struct ifnet *sc_ifp; /* make this an interface */ 254 LIST_ENTRY(bridge_softc) sc_list; 255 struct sx sc_sx; 256 struct mtx sc_rt_mtx; 257 uint32_t sc_brtmax; /* max # of addresses */ 258 uint32_t sc_brtcnt; /* cur. # of addresses */ 259 uint32_t sc_brttimeout; /* rt timeout in seconds */ 260 struct callout sc_brcallout; /* bridge callout */ 261 CK_LIST_HEAD(, bridge_iflist) sc_iflist; /* member interface list */ 262 CK_LIST_HEAD(, bridge_rtnode) *sc_rthash; /* our forwarding table */ 263 CK_LIST_HEAD(, bridge_rtnode) sc_rtlist; /* list version of above */ 264 uint32_t sc_rthash_key; /* key for hash */ 265 CK_LIST_HEAD(, bridge_iflist) sc_spanlist; /* span ports list */ 266 struct bstp_state sc_stp; /* STP state */ 267 uint32_t sc_brtexceeded; /* # of cache drops */ 268 struct ifnet *sc_ifaddr; /* member mac copied from */ 269 struct ether_addr sc_defaddr; /* Default MAC address */ 270 struct epoch_context sc_epoch_ctx; 271 }; 272 273 VNET_DEFINE_STATIC(struct sx, bridge_list_sx); 274 #define V_bridge_list_sx VNET(bridge_list_sx) 275 static eventhandler_tag bridge_detach_cookie; 276 277 int bridge_rtable_prune_period = BRIDGE_RTABLE_PRUNE_PERIOD; 278 279 VNET_DEFINE_STATIC(uma_zone_t, bridge_rtnode_zone); 280 #define V_bridge_rtnode_zone VNET(bridge_rtnode_zone) 281 282 static int bridge_clone_create(struct if_clone *, char *, size_t, 283 struct ifc_data *, struct ifnet **); 284 static int bridge_clone_destroy(struct if_clone *, struct ifnet *, uint32_t); 285 286 static int bridge_ioctl(struct ifnet *, u_long, caddr_t); 287 static void bridge_mutecaps(struct bridge_softc *); 288 static void bridge_set_ifcap(struct bridge_softc *, struct bridge_iflist *, 289 int); 290 static void bridge_ifdetach(void *arg __unused, struct ifnet *); 291 static void bridge_init(void *); 292 static void bridge_dummynet(struct mbuf *, struct ifnet *); 293 static void bridge_stop(struct ifnet *, int); 294 static int bridge_transmit(struct ifnet *, struct mbuf *); 295 #ifdef ALTQ 296 static void bridge_altq_start(if_t); 297 static int bridge_altq_transmit(if_t, struct mbuf *); 298 #endif 299 static void bridge_qflush(struct ifnet *); 300 static struct mbuf *bridge_input(struct ifnet *, struct mbuf *); 301 static int bridge_output(struct ifnet *, struct mbuf *, struct sockaddr *, 302 struct rtentry *); 303 static int bridge_enqueue(struct bridge_softc *, struct ifnet *, 304 struct mbuf *); 305 static void bridge_rtdelete(struct bridge_softc *, struct ifnet *ifp, int); 306 307 static void bridge_forward(struct bridge_softc *, struct bridge_iflist *, 308 struct mbuf *m); 309 310 static void bridge_timer(void *); 311 312 static void bridge_broadcast(struct bridge_softc *, struct ifnet *, 313 struct mbuf *, int); 314 static void bridge_span(struct bridge_softc *, struct mbuf *); 315 316 static int bridge_rtupdate(struct bridge_softc *, const uint8_t *, 317 uint16_t, struct bridge_iflist *, int, uint8_t); 318 static struct ifnet *bridge_rtlookup(struct bridge_softc *, const uint8_t *, 319 uint16_t); 320 static void bridge_rttrim(struct bridge_softc *); 321 static void bridge_rtage(struct bridge_softc *); 322 static void bridge_rtflush(struct bridge_softc *, int); 323 static int bridge_rtdaddr(struct bridge_softc *, const uint8_t *, 324 uint16_t); 325 326 static void bridge_rtable_init(struct bridge_softc *); 327 static void bridge_rtable_fini(struct bridge_softc *); 328 329 static int bridge_rtnode_addr_cmp(const uint8_t *, const uint8_t *); 330 static struct bridge_rtnode *bridge_rtnode_lookup(struct bridge_softc *, 331 const uint8_t *, uint16_t); 332 static int bridge_rtnode_insert(struct bridge_softc *, 333 struct bridge_rtnode *); 334 static void bridge_rtnode_destroy(struct bridge_softc *, 335 struct bridge_rtnode *); 336 static void bridge_rtable_expire(struct ifnet *, int); 337 static void bridge_state_change(struct ifnet *, int); 338 339 static struct bridge_iflist *bridge_lookup_member(struct bridge_softc *, 340 const char *name); 341 static struct bridge_iflist *bridge_lookup_member_if(struct bridge_softc *, 342 struct ifnet *ifp); 343 static void bridge_delete_member(struct bridge_softc *, 344 struct bridge_iflist *, int); 345 static void bridge_delete_span(struct bridge_softc *, 346 struct bridge_iflist *); 347 348 static int bridge_ioctl_add(struct bridge_softc *, void *); 349 static int bridge_ioctl_del(struct bridge_softc *, void *); 350 static int bridge_ioctl_gifflags(struct bridge_softc *, void *); 351 static int bridge_ioctl_sifflags(struct bridge_softc *, void *); 352 static int bridge_ioctl_scache(struct bridge_softc *, void *); 353 static int bridge_ioctl_gcache(struct bridge_softc *, void *); 354 static int bridge_ioctl_gifs(struct bridge_softc *, void *); 355 static int bridge_ioctl_rts(struct bridge_softc *, void *); 356 static int bridge_ioctl_saddr(struct bridge_softc *, void *); 357 static int bridge_ioctl_sto(struct bridge_softc *, void *); 358 static int bridge_ioctl_gto(struct bridge_softc *, void *); 359 static int bridge_ioctl_daddr(struct bridge_softc *, void *); 360 static int bridge_ioctl_flush(struct bridge_softc *, void *); 361 static int bridge_ioctl_gpri(struct bridge_softc *, void *); 362 static int bridge_ioctl_spri(struct bridge_softc *, void *); 363 static int bridge_ioctl_ght(struct bridge_softc *, void *); 364 static int bridge_ioctl_sht(struct bridge_softc *, void *); 365 static int bridge_ioctl_gfd(struct bridge_softc *, void *); 366 static int bridge_ioctl_sfd(struct bridge_softc *, void *); 367 static int bridge_ioctl_gma(struct bridge_softc *, void *); 368 static int bridge_ioctl_sma(struct bridge_softc *, void *); 369 static int bridge_ioctl_sifprio(struct bridge_softc *, void *); 370 static int bridge_ioctl_sifcost(struct bridge_softc *, void *); 371 static int bridge_ioctl_sifmaxaddr(struct bridge_softc *, void *); 372 static int bridge_ioctl_addspan(struct bridge_softc *, void *); 373 static int bridge_ioctl_delspan(struct bridge_softc *, void *); 374 static int bridge_ioctl_gbparam(struct bridge_softc *, void *); 375 static int bridge_ioctl_grte(struct bridge_softc *, void *); 376 static int bridge_ioctl_gifsstp(struct bridge_softc *, void *); 377 static int bridge_ioctl_sproto(struct bridge_softc *, void *); 378 static int bridge_ioctl_stxhc(struct bridge_softc *, void *); 379 static int bridge_pfil(struct mbuf **, struct ifnet *, struct ifnet *, 380 int); 381 static int bridge_ip_checkbasic(struct mbuf **mp); 382 #ifdef INET6 383 static int bridge_ip6_checkbasic(struct mbuf **mp); 384 #endif /* INET6 */ 385 static int bridge_fragment(struct ifnet *, struct mbuf **mp, 386 struct ether_header *, int, struct llc *); 387 static void bridge_linkstate(struct ifnet *ifp); 388 static void bridge_linkcheck(struct bridge_softc *sc); 389 390 /* The default bridge vlan is 1 (IEEE 802.1Q-2003 Table 9-2) */ 391 #define VLANTAGOF(_m) \ 392 (_m->m_flags & M_VLANTAG) ? EVL_VLANOFTAG(_m->m_pkthdr.ether_vtag) : 1 393 394 static struct bstp_cb_ops bridge_ops = { 395 .bcb_state = bridge_state_change, 396 .bcb_rtage = bridge_rtable_expire 397 }; 398 399 SYSCTL_DECL(_net_link); 400 static SYSCTL_NODE(_net_link, IFT_BRIDGE, bridge, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 401 "Bridge"); 402 403 /* only pass IP[46] packets when pfil is enabled */ 404 VNET_DEFINE_STATIC(int, pfil_onlyip) = 1; 405 #define V_pfil_onlyip VNET(pfil_onlyip) 406 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_onlyip, 407 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_onlyip), 0, 408 "Only pass IP packets when pfil is enabled"); 409 410 /* run pfil hooks on the bridge interface */ 411 VNET_DEFINE_STATIC(int, pfil_bridge) = 0; 412 #define V_pfil_bridge VNET(pfil_bridge) 413 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_bridge, 414 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_bridge), 0, 415 "Packet filter on the bridge interface"); 416 417 /* layer2 filter with ipfw */ 418 VNET_DEFINE_STATIC(int, pfil_ipfw); 419 #define V_pfil_ipfw VNET(pfil_ipfw) 420 421 /* layer2 ARP filter with ipfw */ 422 VNET_DEFINE_STATIC(int, pfil_ipfw_arp); 423 #define V_pfil_ipfw_arp VNET(pfil_ipfw_arp) 424 SYSCTL_INT(_net_link_bridge, OID_AUTO, ipfw_arp, 425 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_ipfw_arp), 0, 426 "Filter ARP packets through IPFW layer2"); 427 428 /* run pfil hooks on the member interface */ 429 VNET_DEFINE_STATIC(int, pfil_member) = 0; 430 #define V_pfil_member VNET(pfil_member) 431 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_member, 432 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_member), 0, 433 "Packet filter on the member interface"); 434 435 /* run pfil hooks on the physical interface for locally destined packets */ 436 VNET_DEFINE_STATIC(int, pfil_local_phys); 437 #define V_pfil_local_phys VNET(pfil_local_phys) 438 SYSCTL_INT(_net_link_bridge, OID_AUTO, pfil_local_phys, 439 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(pfil_local_phys), 0, 440 "Packet filter on the physical interface for locally destined packets"); 441 442 /* log STP state changes */ 443 VNET_DEFINE_STATIC(int, log_stp); 444 #define V_log_stp VNET(log_stp) 445 SYSCTL_INT(_net_link_bridge, OID_AUTO, log_stp, 446 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(log_stp), 0, 447 "Log STP state changes"); 448 449 /* share MAC with first bridge member */ 450 VNET_DEFINE_STATIC(int, bridge_inherit_mac); 451 #define V_bridge_inherit_mac VNET(bridge_inherit_mac) 452 SYSCTL_INT(_net_link_bridge, OID_AUTO, inherit_mac, 453 CTLFLAG_RWTUN | CTLFLAG_VNET, &VNET_NAME(bridge_inherit_mac), 0, 454 "Inherit MAC address from the first bridge member"); 455 456 VNET_DEFINE_STATIC(int, allow_llz_overlap) = 0; 457 #define V_allow_llz_overlap VNET(allow_llz_overlap) 458 SYSCTL_INT(_net_link_bridge, OID_AUTO, allow_llz_overlap, 459 CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(allow_llz_overlap), 0, 460 "Allow overlap of link-local scope " 461 "zones of a bridge interface and the member interfaces"); 462 463 struct bridge_control { 464 int (*bc_func)(struct bridge_softc *, void *); 465 int bc_argsize; 466 int bc_flags; 467 }; 468 469 #define BC_F_COPYIN 0x01 /* copy arguments in */ 470 #define BC_F_COPYOUT 0x02 /* copy arguments out */ 471 #define BC_F_SUSER 0x04 /* do super-user check */ 472 473 static const struct bridge_control bridge_control_table[] = { 474 { bridge_ioctl_add, sizeof(struct ifbreq), 475 BC_F_COPYIN|BC_F_SUSER }, 476 { bridge_ioctl_del, sizeof(struct ifbreq), 477 BC_F_COPYIN|BC_F_SUSER }, 478 479 { bridge_ioctl_gifflags, sizeof(struct ifbreq), 480 BC_F_COPYIN|BC_F_COPYOUT }, 481 { bridge_ioctl_sifflags, sizeof(struct ifbreq), 482 BC_F_COPYIN|BC_F_SUSER }, 483 484 { bridge_ioctl_scache, sizeof(struct ifbrparam), 485 BC_F_COPYIN|BC_F_SUSER }, 486 { bridge_ioctl_gcache, sizeof(struct ifbrparam), 487 BC_F_COPYOUT }, 488 489 { bridge_ioctl_gifs, sizeof(struct ifbifconf), 490 BC_F_COPYIN|BC_F_COPYOUT }, 491 { bridge_ioctl_rts, sizeof(struct ifbaconf), 492 BC_F_COPYIN|BC_F_COPYOUT }, 493 494 { bridge_ioctl_saddr, sizeof(struct ifbareq), 495 BC_F_COPYIN|BC_F_SUSER }, 496 497 { bridge_ioctl_sto, sizeof(struct ifbrparam), 498 BC_F_COPYIN|BC_F_SUSER }, 499 { bridge_ioctl_gto, sizeof(struct ifbrparam), 500 BC_F_COPYOUT }, 501 502 { bridge_ioctl_daddr, sizeof(struct ifbareq), 503 BC_F_COPYIN|BC_F_SUSER }, 504 505 { bridge_ioctl_flush, sizeof(struct ifbreq), 506 BC_F_COPYIN|BC_F_SUSER }, 507 508 { bridge_ioctl_gpri, sizeof(struct ifbrparam), 509 BC_F_COPYOUT }, 510 { bridge_ioctl_spri, sizeof(struct ifbrparam), 511 BC_F_COPYIN|BC_F_SUSER }, 512 513 { bridge_ioctl_ght, sizeof(struct ifbrparam), 514 BC_F_COPYOUT }, 515 { bridge_ioctl_sht, sizeof(struct ifbrparam), 516 BC_F_COPYIN|BC_F_SUSER }, 517 518 { bridge_ioctl_gfd, sizeof(struct ifbrparam), 519 BC_F_COPYOUT }, 520 { bridge_ioctl_sfd, sizeof(struct ifbrparam), 521 BC_F_COPYIN|BC_F_SUSER }, 522 523 { bridge_ioctl_gma, sizeof(struct ifbrparam), 524 BC_F_COPYOUT }, 525 { bridge_ioctl_sma, sizeof(struct ifbrparam), 526 BC_F_COPYIN|BC_F_SUSER }, 527 528 { bridge_ioctl_sifprio, sizeof(struct ifbreq), 529 BC_F_COPYIN|BC_F_SUSER }, 530 531 { bridge_ioctl_sifcost, sizeof(struct ifbreq), 532 BC_F_COPYIN|BC_F_SUSER }, 533 534 { bridge_ioctl_addspan, sizeof(struct ifbreq), 535 BC_F_COPYIN|BC_F_SUSER }, 536 { bridge_ioctl_delspan, sizeof(struct ifbreq), 537 BC_F_COPYIN|BC_F_SUSER }, 538 539 { bridge_ioctl_gbparam, sizeof(struct ifbropreq), 540 BC_F_COPYOUT }, 541 542 { bridge_ioctl_grte, sizeof(struct ifbrparam), 543 BC_F_COPYOUT }, 544 545 { bridge_ioctl_gifsstp, sizeof(struct ifbpstpconf), 546 BC_F_COPYIN|BC_F_COPYOUT }, 547 548 { bridge_ioctl_sproto, sizeof(struct ifbrparam), 549 BC_F_COPYIN|BC_F_SUSER }, 550 551 { bridge_ioctl_stxhc, sizeof(struct ifbrparam), 552 BC_F_COPYIN|BC_F_SUSER }, 553 554 { bridge_ioctl_sifmaxaddr, sizeof(struct ifbreq), 555 BC_F_COPYIN|BC_F_SUSER }, 556 557 }; 558 static const int bridge_control_table_size = nitems(bridge_control_table); 559 560 VNET_DEFINE_STATIC(LIST_HEAD(, bridge_softc), bridge_list); 561 #define V_bridge_list VNET(bridge_list) 562 #define BRIDGE_LIST_LOCK_INIT(x) sx_init(&V_bridge_list_sx, \ 563 "if_bridge list") 564 #define BRIDGE_LIST_LOCK_DESTROY(x) sx_destroy(&V_bridge_list_sx) 565 #define BRIDGE_LIST_LOCK(x) sx_xlock(&V_bridge_list_sx) 566 #define BRIDGE_LIST_UNLOCK(x) sx_xunlock(&V_bridge_list_sx) 567 568 VNET_DEFINE_STATIC(struct if_clone *, bridge_cloner); 569 #define V_bridge_cloner VNET(bridge_cloner) 570 571 static const char bridge_name[] = "bridge"; 572 573 static void 574 vnet_bridge_init(const void *unused __unused) 575 { 576 577 V_bridge_rtnode_zone = uma_zcreate("bridge_rtnode", 578 sizeof(struct bridge_rtnode), NULL, NULL, NULL, NULL, 579 UMA_ALIGN_PTR, 0); 580 BRIDGE_LIST_LOCK_INIT(); 581 LIST_INIT(&V_bridge_list); 582 583 struct if_clone_addreq req = { 584 .create_f = bridge_clone_create, 585 .destroy_f = bridge_clone_destroy, 586 .flags = IFC_F_AUTOUNIT, 587 }; 588 V_bridge_cloner = ifc_attach_cloner(bridge_name, &req); 589 } 590 VNET_SYSINIT(vnet_bridge_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 591 vnet_bridge_init, NULL); 592 593 static void 594 vnet_bridge_uninit(const void *unused __unused) 595 { 596 597 ifc_detach_cloner(V_bridge_cloner); 598 V_bridge_cloner = NULL; 599 BRIDGE_LIST_LOCK_DESTROY(); 600 601 /* Callbacks may use the UMA zone. */ 602 NET_EPOCH_DRAIN_CALLBACKS(); 603 604 uma_zdestroy(V_bridge_rtnode_zone); 605 } 606 VNET_SYSUNINIT(vnet_bridge_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY, 607 vnet_bridge_uninit, NULL); 608 609 static int 610 bridge_modevent(module_t mod, int type, void *data) 611 { 612 613 switch (type) { 614 case MOD_LOAD: 615 bridge_dn_p = bridge_dummynet; 616 bridge_detach_cookie = EVENTHANDLER_REGISTER( 617 ifnet_departure_event, bridge_ifdetach, NULL, 618 EVENTHANDLER_PRI_ANY); 619 break; 620 case MOD_UNLOAD: 621 EVENTHANDLER_DEREGISTER(ifnet_departure_event, 622 bridge_detach_cookie); 623 bridge_dn_p = NULL; 624 break; 625 default: 626 return (EOPNOTSUPP); 627 } 628 return (0); 629 } 630 631 static moduledata_t bridge_mod = { 632 "if_bridge", 633 bridge_modevent, 634 0 635 }; 636 637 DECLARE_MODULE(if_bridge, bridge_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 638 MODULE_VERSION(if_bridge, 1); 639 MODULE_DEPEND(if_bridge, bridgestp, 1, 1, 1); 640 641 /* 642 * handler for net.link.bridge.ipfw 643 */ 644 static int 645 sysctl_pfil_ipfw(SYSCTL_HANDLER_ARGS) 646 { 647 int enable = V_pfil_ipfw; 648 int error; 649 650 error = sysctl_handle_int(oidp, &enable, 0, req); 651 enable &= 1; 652 653 if (enable != V_pfil_ipfw) { 654 V_pfil_ipfw = enable; 655 656 /* 657 * Disable pfil so that ipfw doesnt run twice, if the user 658 * really wants both then they can re-enable pfil_bridge and/or 659 * pfil_member. Also allow non-ip packets as ipfw can filter by 660 * layer2 type. 661 */ 662 if (V_pfil_ipfw) { 663 V_pfil_onlyip = 0; 664 V_pfil_bridge = 0; 665 V_pfil_member = 0; 666 } 667 } 668 669 return (error); 670 } 671 SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw, 672 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_VNET | CTLFLAG_NEEDGIANT, 673 &VNET_NAME(pfil_ipfw), 0, &sysctl_pfil_ipfw, "I", 674 "Layer2 filter with IPFW"); 675 676 #ifdef VIMAGE 677 static void 678 bridge_reassign(struct ifnet *ifp, struct vnet *newvnet, char *arg) 679 { 680 struct bridge_softc *sc = ifp->if_softc; 681 struct bridge_iflist *bif; 682 683 BRIDGE_LOCK(sc); 684 685 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL) 686 bridge_delete_member(sc, bif, 0); 687 688 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) { 689 bridge_delete_span(sc, bif); 690 } 691 692 BRIDGE_UNLOCK(sc); 693 694 ether_reassign(ifp, newvnet, arg); 695 } 696 #endif 697 698 /* 699 * bridge_clone_create: 700 * 701 * Create a new bridge instance. 702 */ 703 static int 704 bridge_clone_create(struct if_clone *ifc, char *name, size_t len, 705 struct ifc_data *ifd, struct ifnet **ifpp) 706 { 707 struct bridge_softc *sc; 708 struct ifnet *ifp; 709 710 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 711 ifp = sc->sc_ifp = if_alloc(IFT_ETHER); 712 if (ifp == NULL) { 713 free(sc, M_DEVBUF); 714 return (ENOSPC); 715 } 716 717 BRIDGE_LOCK_INIT(sc); 718 sc->sc_brtmax = BRIDGE_RTABLE_MAX; 719 sc->sc_brttimeout = BRIDGE_RTABLE_TIMEOUT; 720 721 /* Initialize our routing table. */ 722 bridge_rtable_init(sc); 723 724 callout_init_mtx(&sc->sc_brcallout, &sc->sc_rt_mtx, 0); 725 726 CK_LIST_INIT(&sc->sc_iflist); 727 CK_LIST_INIT(&sc->sc_spanlist); 728 729 ifp->if_softc = sc; 730 if_initname(ifp, bridge_name, ifd->unit); 731 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 732 ifp->if_ioctl = bridge_ioctl; 733 #ifdef ALTQ 734 ifp->if_start = bridge_altq_start; 735 ifp->if_transmit = bridge_altq_transmit; 736 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 737 ifp->if_snd.ifq_drv_maxlen = 0; 738 IFQ_SET_READY(&ifp->if_snd); 739 #else 740 ifp->if_transmit = bridge_transmit; 741 #endif 742 ifp->if_qflush = bridge_qflush; 743 ifp->if_init = bridge_init; 744 ifp->if_type = IFT_BRIDGE; 745 746 ether_gen_addr(ifp, &sc->sc_defaddr); 747 748 bstp_attach(&sc->sc_stp, &bridge_ops); 749 ether_ifattach(ifp, sc->sc_defaddr.octet); 750 /* Now undo some of the damage... */ 751 ifp->if_baudrate = 0; 752 ifp->if_type = IFT_BRIDGE; 753 #ifdef VIMAGE 754 ifp->if_reassign = bridge_reassign; 755 #endif 756 757 BRIDGE_LIST_LOCK(); 758 LIST_INSERT_HEAD(&V_bridge_list, sc, sc_list); 759 BRIDGE_LIST_UNLOCK(); 760 *ifpp = ifp; 761 762 return (0); 763 } 764 765 static void 766 bridge_clone_destroy_cb(struct epoch_context *ctx) 767 { 768 struct bridge_softc *sc; 769 770 sc = __containerof(ctx, struct bridge_softc, sc_epoch_ctx); 771 772 BRIDGE_LOCK_DESTROY(sc); 773 free(sc, M_DEVBUF); 774 } 775 776 /* 777 * bridge_clone_destroy: 778 * 779 * Destroy a bridge instance. 780 */ 781 static int 782 bridge_clone_destroy(struct if_clone *ifc, struct ifnet *ifp, uint32_t flags) 783 { 784 struct bridge_softc *sc = ifp->if_softc; 785 struct bridge_iflist *bif; 786 struct epoch_tracker et; 787 788 BRIDGE_LOCK(sc); 789 790 bridge_stop(ifp, 1); 791 ifp->if_flags &= ~IFF_UP; 792 793 while ((bif = CK_LIST_FIRST(&sc->sc_iflist)) != NULL) 794 bridge_delete_member(sc, bif, 0); 795 796 while ((bif = CK_LIST_FIRST(&sc->sc_spanlist)) != NULL) { 797 bridge_delete_span(sc, bif); 798 } 799 800 /* Tear down the routing table. */ 801 bridge_rtable_fini(sc); 802 803 BRIDGE_UNLOCK(sc); 804 805 NET_EPOCH_ENTER(et); 806 807 callout_drain(&sc->sc_brcallout); 808 809 BRIDGE_LIST_LOCK(); 810 LIST_REMOVE(sc, sc_list); 811 BRIDGE_LIST_UNLOCK(); 812 813 bstp_detach(&sc->sc_stp); 814 #ifdef ALTQ 815 IFQ_PURGE(&ifp->if_snd); 816 #endif 817 NET_EPOCH_EXIT(et); 818 819 ether_ifdetach(ifp); 820 if_free(ifp); 821 822 NET_EPOCH_CALL(bridge_clone_destroy_cb, &sc->sc_epoch_ctx); 823 824 return (0); 825 } 826 827 /* 828 * bridge_ioctl: 829 * 830 * Handle a control request from the operator. 831 */ 832 static int 833 bridge_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 834 { 835 struct bridge_softc *sc = ifp->if_softc; 836 struct ifreq *ifr = (struct ifreq *)data; 837 struct bridge_iflist *bif; 838 struct thread *td = curthread; 839 union { 840 struct ifbreq ifbreq; 841 struct ifbifconf ifbifconf; 842 struct ifbareq ifbareq; 843 struct ifbaconf ifbaconf; 844 struct ifbrparam ifbrparam; 845 struct ifbropreq ifbropreq; 846 } args; 847 struct ifdrv *ifd = (struct ifdrv *) data; 848 const struct bridge_control *bc; 849 int error = 0, oldmtu; 850 851 BRIDGE_LOCK(sc); 852 853 switch (cmd) { 854 case SIOCADDMULTI: 855 case SIOCDELMULTI: 856 break; 857 858 case SIOCGDRVSPEC: 859 case SIOCSDRVSPEC: 860 if (ifd->ifd_cmd >= bridge_control_table_size) { 861 error = EINVAL; 862 break; 863 } 864 bc = &bridge_control_table[ifd->ifd_cmd]; 865 866 if (cmd == SIOCGDRVSPEC && 867 (bc->bc_flags & BC_F_COPYOUT) == 0) { 868 error = EINVAL; 869 break; 870 } 871 else if (cmd == SIOCSDRVSPEC && 872 (bc->bc_flags & BC_F_COPYOUT) != 0) { 873 error = EINVAL; 874 break; 875 } 876 877 if (bc->bc_flags & BC_F_SUSER) { 878 error = priv_check(td, PRIV_NET_BRIDGE); 879 if (error) 880 break; 881 } 882 883 if (ifd->ifd_len != bc->bc_argsize || 884 ifd->ifd_len > sizeof(args)) { 885 error = EINVAL; 886 break; 887 } 888 889 bzero(&args, sizeof(args)); 890 if (bc->bc_flags & BC_F_COPYIN) { 891 error = copyin(ifd->ifd_data, &args, ifd->ifd_len); 892 if (error) 893 break; 894 } 895 896 oldmtu = ifp->if_mtu; 897 error = (*bc->bc_func)(sc, &args); 898 if (error) 899 break; 900 901 /* 902 * Bridge MTU may change during addition of the first port. 903 * If it did, do network layer specific procedure. 904 */ 905 if (ifp->if_mtu != oldmtu) 906 if_notifymtu(ifp); 907 908 if (bc->bc_flags & BC_F_COPYOUT) 909 error = copyout(&args, ifd->ifd_data, ifd->ifd_len); 910 911 break; 912 913 case SIOCSIFFLAGS: 914 if (!(ifp->if_flags & IFF_UP) && 915 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 916 /* 917 * If interface is marked down and it is running, 918 * then stop and disable it. 919 */ 920 bridge_stop(ifp, 1); 921 } else if ((ifp->if_flags & IFF_UP) && 922 !(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 923 /* 924 * If interface is marked up and it is stopped, then 925 * start it. 926 */ 927 BRIDGE_UNLOCK(sc); 928 (*ifp->if_init)(sc); 929 BRIDGE_LOCK(sc); 930 } 931 break; 932 933 case SIOCSIFMTU: 934 oldmtu = sc->sc_ifp->if_mtu; 935 936 if (ifr->ifr_mtu < 576) { 937 error = EINVAL; 938 break; 939 } 940 if (CK_LIST_EMPTY(&sc->sc_iflist)) { 941 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 942 break; 943 } 944 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 945 error = (*bif->bif_ifp->if_ioctl)(bif->bif_ifp, 946 SIOCSIFMTU, (caddr_t)ifr); 947 if (error != 0) { 948 log(LOG_NOTICE, "%s: invalid MTU: %u for" 949 " member %s\n", sc->sc_ifp->if_xname, 950 ifr->ifr_mtu, 951 bif->bif_ifp->if_xname); 952 error = EINVAL; 953 break; 954 } 955 } 956 if (error) { 957 /* Restore the previous MTU on all member interfaces. */ 958 ifr->ifr_mtu = oldmtu; 959 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 960 (*bif->bif_ifp->if_ioctl)(bif->bif_ifp, 961 SIOCSIFMTU, (caddr_t)ifr); 962 } 963 } else { 964 sc->sc_ifp->if_mtu = ifr->ifr_mtu; 965 } 966 break; 967 default: 968 /* 969 * drop the lock as ether_ioctl() will call bridge_start() and 970 * cause the lock to be recursed. 971 */ 972 BRIDGE_UNLOCK(sc); 973 error = ether_ioctl(ifp, cmd, data); 974 BRIDGE_LOCK(sc); 975 break; 976 } 977 978 BRIDGE_UNLOCK(sc); 979 980 return (error); 981 } 982 983 /* 984 * bridge_mutecaps: 985 * 986 * Clear or restore unwanted capabilities on the member interface 987 */ 988 static void 989 bridge_mutecaps(struct bridge_softc *sc) 990 { 991 struct bridge_iflist *bif; 992 int enabled, mask; 993 994 BRIDGE_LOCK_ASSERT(sc); 995 996 /* Initial bitmask of capabilities to test */ 997 mask = BRIDGE_IFCAPS_MASK; 998 999 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1000 /* Every member must support it or its disabled */ 1001 mask &= bif->bif_savedcaps; 1002 } 1003 1004 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1005 enabled = bif->bif_ifp->if_capenable; 1006 enabled &= ~BRIDGE_IFCAPS_STRIP; 1007 /* strip off mask bits and enable them again if allowed */ 1008 enabled &= ~BRIDGE_IFCAPS_MASK; 1009 enabled |= mask; 1010 bridge_set_ifcap(sc, bif, enabled); 1011 } 1012 } 1013 1014 static void 1015 bridge_set_ifcap(struct bridge_softc *sc, struct bridge_iflist *bif, int set) 1016 { 1017 struct ifnet *ifp = bif->bif_ifp; 1018 struct ifreq ifr; 1019 int error, mask, stuck; 1020 1021 bzero(&ifr, sizeof(ifr)); 1022 ifr.ifr_reqcap = set; 1023 1024 if (ifp->if_capenable != set) { 1025 error = (*ifp->if_ioctl)(ifp, SIOCSIFCAP, (caddr_t)&ifr); 1026 if (error) 1027 if_printf(sc->sc_ifp, 1028 "error setting capabilities on %s: %d\n", 1029 ifp->if_xname, error); 1030 mask = BRIDGE_IFCAPS_MASK | BRIDGE_IFCAPS_STRIP; 1031 stuck = ifp->if_capenable & mask & ~set; 1032 if (stuck != 0) 1033 if_printf(sc->sc_ifp, 1034 "can't disable some capabilities on %s: 0x%x\n", 1035 ifp->if_xname, stuck); 1036 } 1037 } 1038 1039 /* 1040 * bridge_lookup_member: 1041 * 1042 * Lookup a bridge member interface. 1043 */ 1044 static struct bridge_iflist * 1045 bridge_lookup_member(struct bridge_softc *sc, const char *name) 1046 { 1047 struct bridge_iflist *bif; 1048 struct ifnet *ifp; 1049 1050 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 1051 1052 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1053 ifp = bif->bif_ifp; 1054 if (strcmp(ifp->if_xname, name) == 0) 1055 return (bif); 1056 } 1057 1058 return (NULL); 1059 } 1060 1061 /* 1062 * bridge_lookup_member_if: 1063 * 1064 * Lookup a bridge member interface by ifnet*. 1065 */ 1066 static struct bridge_iflist * 1067 bridge_lookup_member_if(struct bridge_softc *sc, struct ifnet *member_ifp) 1068 { 1069 struct bridge_iflist *bif; 1070 1071 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 1072 1073 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1074 if (bif->bif_ifp == member_ifp) 1075 return (bif); 1076 } 1077 1078 return (NULL); 1079 } 1080 1081 static void 1082 bridge_delete_member_cb(struct epoch_context *ctx) 1083 { 1084 struct bridge_iflist *bif; 1085 1086 bif = __containerof(ctx, struct bridge_iflist, bif_epoch_ctx); 1087 1088 free(bif, M_DEVBUF); 1089 } 1090 1091 /* 1092 * bridge_delete_member: 1093 * 1094 * Delete the specified member interface. 1095 */ 1096 static void 1097 bridge_delete_member(struct bridge_softc *sc, struct bridge_iflist *bif, 1098 int gone) 1099 { 1100 struct ifnet *ifs = bif->bif_ifp; 1101 struct ifnet *fif = NULL; 1102 struct bridge_iflist *bifl; 1103 1104 BRIDGE_LOCK_ASSERT(sc); 1105 1106 if (bif->bif_flags & IFBIF_STP) 1107 bstp_disable(&bif->bif_stp); 1108 1109 ifs->if_bridge = NULL; 1110 CK_LIST_REMOVE(bif, bif_next); 1111 1112 /* 1113 * If removing the interface that gave the bridge its mac address, set 1114 * the mac address of the bridge to the address of the next member, or 1115 * to its default address if no members are left. 1116 */ 1117 if (V_bridge_inherit_mac && sc->sc_ifaddr == ifs) { 1118 if (CK_LIST_EMPTY(&sc->sc_iflist)) { 1119 bcopy(&sc->sc_defaddr, 1120 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1121 sc->sc_ifaddr = NULL; 1122 } else { 1123 bifl = CK_LIST_FIRST(&sc->sc_iflist); 1124 fif = bifl->bif_ifp; 1125 bcopy(IF_LLADDR(fif), 1126 IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1127 sc->sc_ifaddr = fif; 1128 } 1129 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1130 } 1131 1132 bridge_linkcheck(sc); 1133 bridge_mutecaps(sc); /* recalcuate now this interface is removed */ 1134 BRIDGE_RT_LOCK(sc); 1135 bridge_rtdelete(sc, ifs, IFBF_FLUSHALL); 1136 BRIDGE_RT_UNLOCK(sc); 1137 KASSERT(bif->bif_addrcnt == 0, 1138 ("%s: %d bridge routes referenced", __func__, bif->bif_addrcnt)); 1139 1140 ifs->if_bridge_output = NULL; 1141 ifs->if_bridge_input = NULL; 1142 ifs->if_bridge_linkstate = NULL; 1143 if (!gone) { 1144 switch (ifs->if_type) { 1145 case IFT_ETHER: 1146 case IFT_L2VLAN: 1147 /* 1148 * Take the interface out of promiscuous mode, but only 1149 * if it was promiscuous in the first place. It might 1150 * not be if we're in the bridge_ioctl_add() error path. 1151 */ 1152 if (ifs->if_flags & IFF_PROMISC) 1153 (void) ifpromisc(ifs, 0); 1154 break; 1155 1156 case IFT_GIF: 1157 break; 1158 1159 default: 1160 #ifdef DIAGNOSTIC 1161 panic("bridge_delete_member: impossible"); 1162 #endif 1163 break; 1164 } 1165 /* reneable any interface capabilities */ 1166 bridge_set_ifcap(sc, bif, bif->bif_savedcaps); 1167 } 1168 bstp_destroy(&bif->bif_stp); /* prepare to free */ 1169 1170 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx); 1171 } 1172 1173 /* 1174 * bridge_delete_span: 1175 * 1176 * Delete the specified span interface. 1177 */ 1178 static void 1179 bridge_delete_span(struct bridge_softc *sc, struct bridge_iflist *bif) 1180 { 1181 BRIDGE_LOCK_ASSERT(sc); 1182 1183 KASSERT(bif->bif_ifp->if_bridge == NULL, 1184 ("%s: not a span interface", __func__)); 1185 1186 CK_LIST_REMOVE(bif, bif_next); 1187 1188 NET_EPOCH_CALL(bridge_delete_member_cb, &bif->bif_epoch_ctx); 1189 } 1190 1191 static int 1192 bridge_ioctl_add(struct bridge_softc *sc, void *arg) 1193 { 1194 struct ifbreq *req = arg; 1195 struct bridge_iflist *bif = NULL; 1196 struct ifnet *ifs; 1197 int error = 0; 1198 1199 ifs = ifunit(req->ifbr_ifsname); 1200 if (ifs == NULL) 1201 return (ENOENT); 1202 if (ifs->if_ioctl == NULL) /* must be supported */ 1203 return (EINVAL); 1204 1205 /* If it's in the span list, it can't be a member. */ 1206 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1207 if (ifs == bif->bif_ifp) 1208 return (EBUSY); 1209 1210 if (ifs->if_bridge == sc) 1211 return (EEXIST); 1212 1213 if (ifs->if_bridge != NULL) 1214 return (EBUSY); 1215 1216 switch (ifs->if_type) { 1217 case IFT_ETHER: 1218 case IFT_L2VLAN: 1219 case IFT_GIF: 1220 /* permitted interface types */ 1221 break; 1222 default: 1223 return (EINVAL); 1224 } 1225 1226 #ifdef INET6 1227 /* 1228 * Two valid inet6 addresses with link-local scope must not be 1229 * on the parent interface and the member interfaces at the 1230 * same time. This restriction is needed to prevent violation 1231 * of link-local scope zone. Attempts to add a member 1232 * interface which has inet6 addresses when the parent has 1233 * inet6 triggers removal of all inet6 addresses on the member 1234 * interface. 1235 */ 1236 1237 /* Check if the parent interface has a link-local scope addr. */ 1238 if (V_allow_llz_overlap == 0 && 1239 in6ifa_llaonifp(sc->sc_ifp) != NULL) { 1240 /* 1241 * If any, remove all inet6 addresses from the member 1242 * interfaces. 1243 */ 1244 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1245 if (in6ifa_llaonifp(bif->bif_ifp)) { 1246 in6_ifdetach(bif->bif_ifp); 1247 if_printf(sc->sc_ifp, 1248 "IPv6 addresses on %s have been removed " 1249 "before adding it as a member to prevent " 1250 "IPv6 address scope violation.\n", 1251 bif->bif_ifp->if_xname); 1252 } 1253 } 1254 if (in6ifa_llaonifp(ifs)) { 1255 in6_ifdetach(ifs); 1256 if_printf(sc->sc_ifp, 1257 "IPv6 addresses on %s have been removed " 1258 "before adding it as a member to prevent " 1259 "IPv6 address scope violation.\n", 1260 ifs->if_xname); 1261 } 1262 } 1263 #endif 1264 /* Allow the first Ethernet member to define the MTU */ 1265 if (CK_LIST_EMPTY(&sc->sc_iflist)) 1266 sc->sc_ifp->if_mtu = ifs->if_mtu; 1267 else if (sc->sc_ifp->if_mtu != ifs->if_mtu) { 1268 struct ifreq ifr; 1269 1270 snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", 1271 ifs->if_xname); 1272 ifr.ifr_mtu = sc->sc_ifp->if_mtu; 1273 1274 error = (*ifs->if_ioctl)(ifs, 1275 SIOCSIFMTU, (caddr_t)&ifr); 1276 if (error != 0) { 1277 log(LOG_NOTICE, "%s: invalid MTU: %u for" 1278 " new member %s\n", sc->sc_ifp->if_xname, 1279 ifr.ifr_mtu, 1280 ifs->if_xname); 1281 return (EINVAL); 1282 } 1283 } 1284 1285 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1286 if (bif == NULL) 1287 return (ENOMEM); 1288 1289 bif->bif_ifp = ifs; 1290 bif->bif_flags = IFBIF_LEARNING | IFBIF_DISCOVER; 1291 bif->bif_savedcaps = ifs->if_capenable; 1292 1293 /* 1294 * Assign the interface's MAC address to the bridge if it's the first 1295 * member and the MAC address of the bridge has not been changed from 1296 * the default randomly generated one. 1297 */ 1298 if (V_bridge_inherit_mac && CK_LIST_EMPTY(&sc->sc_iflist) && 1299 !memcmp(IF_LLADDR(sc->sc_ifp), sc->sc_defaddr.octet, ETHER_ADDR_LEN)) { 1300 bcopy(IF_LLADDR(ifs), IF_LLADDR(sc->sc_ifp), ETHER_ADDR_LEN); 1301 sc->sc_ifaddr = ifs; 1302 EVENTHANDLER_INVOKE(iflladdr_event, sc->sc_ifp); 1303 } 1304 1305 ifs->if_bridge = sc; 1306 ifs->if_bridge_output = bridge_output; 1307 ifs->if_bridge_input = bridge_input; 1308 ifs->if_bridge_linkstate = bridge_linkstate; 1309 bstp_create(&sc->sc_stp, &bif->bif_stp, bif->bif_ifp); 1310 /* 1311 * XXX: XLOCK HERE!?! 1312 * 1313 * NOTE: insert_***HEAD*** should be safe for the traversals. 1314 */ 1315 CK_LIST_INSERT_HEAD(&sc->sc_iflist, bif, bif_next); 1316 1317 /* Set interface capabilities to the intersection set of all members */ 1318 bridge_mutecaps(sc); 1319 bridge_linkcheck(sc); 1320 1321 /* Place the interface into promiscuous mode */ 1322 switch (ifs->if_type) { 1323 case IFT_ETHER: 1324 case IFT_L2VLAN: 1325 error = ifpromisc(ifs, 1); 1326 break; 1327 } 1328 1329 if (error) 1330 bridge_delete_member(sc, bif, 0); 1331 return (error); 1332 } 1333 1334 static int 1335 bridge_ioctl_del(struct bridge_softc *sc, void *arg) 1336 { 1337 struct ifbreq *req = arg; 1338 struct bridge_iflist *bif; 1339 1340 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1341 if (bif == NULL) 1342 return (ENOENT); 1343 1344 bridge_delete_member(sc, bif, 0); 1345 1346 return (0); 1347 } 1348 1349 static int 1350 bridge_ioctl_gifflags(struct bridge_softc *sc, void *arg) 1351 { 1352 struct ifbreq *req = arg; 1353 struct bridge_iflist *bif; 1354 struct bstp_port *bp; 1355 1356 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1357 if (bif == NULL) 1358 return (ENOENT); 1359 1360 bp = &bif->bif_stp; 1361 req->ifbr_ifsflags = bif->bif_flags; 1362 req->ifbr_state = bp->bp_state; 1363 req->ifbr_priority = bp->bp_priority; 1364 req->ifbr_path_cost = bp->bp_path_cost; 1365 req->ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1366 req->ifbr_proto = bp->bp_protover; 1367 req->ifbr_role = bp->bp_role; 1368 req->ifbr_stpflags = bp->bp_flags; 1369 req->ifbr_addrcnt = bif->bif_addrcnt; 1370 req->ifbr_addrmax = bif->bif_addrmax; 1371 req->ifbr_addrexceeded = bif->bif_addrexceeded; 1372 1373 /* Copy STP state options as flags */ 1374 if (bp->bp_operedge) 1375 req->ifbr_ifsflags |= IFBIF_BSTP_EDGE; 1376 if (bp->bp_flags & BSTP_PORT_AUTOEDGE) 1377 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOEDGE; 1378 if (bp->bp_ptp_link) 1379 req->ifbr_ifsflags |= IFBIF_BSTP_PTP; 1380 if (bp->bp_flags & BSTP_PORT_AUTOPTP) 1381 req->ifbr_ifsflags |= IFBIF_BSTP_AUTOPTP; 1382 if (bp->bp_flags & BSTP_PORT_ADMEDGE) 1383 req->ifbr_ifsflags |= IFBIF_BSTP_ADMEDGE; 1384 if (bp->bp_flags & BSTP_PORT_ADMCOST) 1385 req->ifbr_ifsflags |= IFBIF_BSTP_ADMCOST; 1386 return (0); 1387 } 1388 1389 static int 1390 bridge_ioctl_sifflags(struct bridge_softc *sc, void *arg) 1391 { 1392 struct epoch_tracker et; 1393 struct ifbreq *req = arg; 1394 struct bridge_iflist *bif; 1395 struct bstp_port *bp; 1396 int error; 1397 1398 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1399 if (bif == NULL) 1400 return (ENOENT); 1401 bp = &bif->bif_stp; 1402 1403 if (req->ifbr_ifsflags & IFBIF_SPAN) 1404 /* SPAN is readonly */ 1405 return (EINVAL); 1406 1407 NET_EPOCH_ENTER(et); 1408 1409 if (req->ifbr_ifsflags & IFBIF_STP) { 1410 if ((bif->bif_flags & IFBIF_STP) == 0) { 1411 error = bstp_enable(&bif->bif_stp); 1412 if (error) { 1413 NET_EPOCH_EXIT(et); 1414 return (error); 1415 } 1416 } 1417 } else { 1418 if ((bif->bif_flags & IFBIF_STP) != 0) 1419 bstp_disable(&bif->bif_stp); 1420 } 1421 1422 /* Pass on STP flags */ 1423 bstp_set_edge(bp, req->ifbr_ifsflags & IFBIF_BSTP_EDGE ? 1 : 0); 1424 bstp_set_autoedge(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOEDGE ? 1 : 0); 1425 bstp_set_ptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_PTP ? 1 : 0); 1426 bstp_set_autoptp(bp, req->ifbr_ifsflags & IFBIF_BSTP_AUTOPTP ? 1 : 0); 1427 1428 /* Save the bits relating to the bridge */ 1429 bif->bif_flags = req->ifbr_ifsflags & IFBIFMASK; 1430 1431 NET_EPOCH_EXIT(et); 1432 1433 return (0); 1434 } 1435 1436 static int 1437 bridge_ioctl_scache(struct bridge_softc *sc, void *arg) 1438 { 1439 struct ifbrparam *param = arg; 1440 1441 sc->sc_brtmax = param->ifbrp_csize; 1442 bridge_rttrim(sc); 1443 1444 return (0); 1445 } 1446 1447 static int 1448 bridge_ioctl_gcache(struct bridge_softc *sc, void *arg) 1449 { 1450 struct ifbrparam *param = arg; 1451 1452 param->ifbrp_csize = sc->sc_brtmax; 1453 1454 return (0); 1455 } 1456 1457 static int 1458 bridge_ioctl_gifs(struct bridge_softc *sc, void *arg) 1459 { 1460 struct ifbifconf *bifc = arg; 1461 struct bridge_iflist *bif; 1462 struct ifbreq breq; 1463 char *buf, *outbuf; 1464 int count, buflen, len, error = 0; 1465 1466 count = 0; 1467 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) 1468 count++; 1469 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1470 count++; 1471 1472 buflen = sizeof(breq) * count; 1473 if (bifc->ifbic_len == 0) { 1474 bifc->ifbic_len = buflen; 1475 return (0); 1476 } 1477 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1478 if (outbuf == NULL) 1479 return (ENOMEM); 1480 1481 count = 0; 1482 buf = outbuf; 1483 len = min(bifc->ifbic_len, buflen); 1484 bzero(&breq, sizeof(breq)); 1485 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1486 if (len < sizeof(breq)) 1487 break; 1488 1489 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1490 sizeof(breq.ifbr_ifsname)); 1491 /* Fill in the ifbreq structure */ 1492 error = bridge_ioctl_gifflags(sc, &breq); 1493 if (error) 1494 break; 1495 memcpy(buf, &breq, sizeof(breq)); 1496 count++; 1497 buf += sizeof(breq); 1498 len -= sizeof(breq); 1499 } 1500 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 1501 if (len < sizeof(breq)) 1502 break; 1503 1504 strlcpy(breq.ifbr_ifsname, bif->bif_ifp->if_xname, 1505 sizeof(breq.ifbr_ifsname)); 1506 breq.ifbr_ifsflags = bif->bif_flags; 1507 breq.ifbr_portno = bif->bif_ifp->if_index & 0xfff; 1508 memcpy(buf, &breq, sizeof(breq)); 1509 count++; 1510 buf += sizeof(breq); 1511 len -= sizeof(breq); 1512 } 1513 1514 bifc->ifbic_len = sizeof(breq) * count; 1515 error = copyout(outbuf, bifc->ifbic_req, bifc->ifbic_len); 1516 free(outbuf, M_TEMP); 1517 return (error); 1518 } 1519 1520 static int 1521 bridge_ioctl_rts(struct bridge_softc *sc, void *arg) 1522 { 1523 struct ifbaconf *bac = arg; 1524 struct bridge_rtnode *brt; 1525 struct ifbareq bareq; 1526 char *buf, *outbuf; 1527 int count, buflen, len, error = 0; 1528 1529 if (bac->ifbac_len == 0) 1530 return (0); 1531 1532 count = 0; 1533 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) 1534 count++; 1535 buflen = sizeof(bareq) * count; 1536 1537 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1538 if (outbuf == NULL) 1539 return (ENOMEM); 1540 1541 count = 0; 1542 buf = outbuf; 1543 len = min(bac->ifbac_len, buflen); 1544 bzero(&bareq, sizeof(bareq)); 1545 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 1546 if (len < sizeof(bareq)) 1547 goto out; 1548 strlcpy(bareq.ifba_ifsname, brt->brt_ifp->if_xname, 1549 sizeof(bareq.ifba_ifsname)); 1550 memcpy(bareq.ifba_dst, brt->brt_addr, sizeof(brt->brt_addr)); 1551 bareq.ifba_vlan = brt->brt_vlan; 1552 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 1553 time_uptime < brt->brt_expire) 1554 bareq.ifba_expire = brt->brt_expire - time_uptime; 1555 else 1556 bareq.ifba_expire = 0; 1557 bareq.ifba_flags = brt->brt_flags; 1558 1559 memcpy(buf, &bareq, sizeof(bareq)); 1560 count++; 1561 buf += sizeof(bareq); 1562 len -= sizeof(bareq); 1563 } 1564 out: 1565 bac->ifbac_len = sizeof(bareq) * count; 1566 error = copyout(outbuf, bac->ifbac_req, bac->ifbac_len); 1567 free(outbuf, M_TEMP); 1568 return (error); 1569 } 1570 1571 static int 1572 bridge_ioctl_saddr(struct bridge_softc *sc, void *arg) 1573 { 1574 struct ifbareq *req = arg; 1575 struct bridge_iflist *bif; 1576 struct epoch_tracker et; 1577 int error; 1578 1579 NET_EPOCH_ENTER(et); 1580 bif = bridge_lookup_member(sc, req->ifba_ifsname); 1581 if (bif == NULL) { 1582 NET_EPOCH_EXIT(et); 1583 return (ENOENT); 1584 } 1585 1586 /* bridge_rtupdate() may acquire the lock. */ 1587 error = bridge_rtupdate(sc, req->ifba_dst, req->ifba_vlan, bif, 1, 1588 req->ifba_flags); 1589 NET_EPOCH_EXIT(et); 1590 1591 return (error); 1592 } 1593 1594 static int 1595 bridge_ioctl_sto(struct bridge_softc *sc, void *arg) 1596 { 1597 struct ifbrparam *param = arg; 1598 1599 sc->sc_brttimeout = param->ifbrp_ctime; 1600 return (0); 1601 } 1602 1603 static int 1604 bridge_ioctl_gto(struct bridge_softc *sc, void *arg) 1605 { 1606 struct ifbrparam *param = arg; 1607 1608 param->ifbrp_ctime = sc->sc_brttimeout; 1609 return (0); 1610 } 1611 1612 static int 1613 bridge_ioctl_daddr(struct bridge_softc *sc, void *arg) 1614 { 1615 struct ifbareq *req = arg; 1616 1617 return (bridge_rtdaddr(sc, req->ifba_dst, req->ifba_vlan)); 1618 } 1619 1620 static int 1621 bridge_ioctl_flush(struct bridge_softc *sc, void *arg) 1622 { 1623 struct ifbreq *req = arg; 1624 1625 BRIDGE_RT_LOCK(sc); 1626 bridge_rtflush(sc, req->ifbr_ifsflags); 1627 BRIDGE_RT_UNLOCK(sc); 1628 1629 return (0); 1630 } 1631 1632 static int 1633 bridge_ioctl_gpri(struct bridge_softc *sc, void *arg) 1634 { 1635 struct ifbrparam *param = arg; 1636 struct bstp_state *bs = &sc->sc_stp; 1637 1638 param->ifbrp_prio = bs->bs_bridge_priority; 1639 return (0); 1640 } 1641 1642 static int 1643 bridge_ioctl_spri(struct bridge_softc *sc, void *arg) 1644 { 1645 struct ifbrparam *param = arg; 1646 1647 return (bstp_set_priority(&sc->sc_stp, param->ifbrp_prio)); 1648 } 1649 1650 static int 1651 bridge_ioctl_ght(struct bridge_softc *sc, void *arg) 1652 { 1653 struct ifbrparam *param = arg; 1654 struct bstp_state *bs = &sc->sc_stp; 1655 1656 param->ifbrp_hellotime = bs->bs_bridge_htime >> 8; 1657 return (0); 1658 } 1659 1660 static int 1661 bridge_ioctl_sht(struct bridge_softc *sc, void *arg) 1662 { 1663 struct ifbrparam *param = arg; 1664 1665 return (bstp_set_htime(&sc->sc_stp, param->ifbrp_hellotime)); 1666 } 1667 1668 static int 1669 bridge_ioctl_gfd(struct bridge_softc *sc, void *arg) 1670 { 1671 struct ifbrparam *param = arg; 1672 struct bstp_state *bs = &sc->sc_stp; 1673 1674 param->ifbrp_fwddelay = bs->bs_bridge_fdelay >> 8; 1675 return (0); 1676 } 1677 1678 static int 1679 bridge_ioctl_sfd(struct bridge_softc *sc, void *arg) 1680 { 1681 struct ifbrparam *param = arg; 1682 1683 return (bstp_set_fdelay(&sc->sc_stp, param->ifbrp_fwddelay)); 1684 } 1685 1686 static int 1687 bridge_ioctl_gma(struct bridge_softc *sc, void *arg) 1688 { 1689 struct ifbrparam *param = arg; 1690 struct bstp_state *bs = &sc->sc_stp; 1691 1692 param->ifbrp_maxage = bs->bs_bridge_max_age >> 8; 1693 return (0); 1694 } 1695 1696 static int 1697 bridge_ioctl_sma(struct bridge_softc *sc, void *arg) 1698 { 1699 struct ifbrparam *param = arg; 1700 1701 return (bstp_set_maxage(&sc->sc_stp, param->ifbrp_maxage)); 1702 } 1703 1704 static int 1705 bridge_ioctl_sifprio(struct bridge_softc *sc, void *arg) 1706 { 1707 struct ifbreq *req = arg; 1708 struct bridge_iflist *bif; 1709 1710 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1711 if (bif == NULL) 1712 return (ENOENT); 1713 1714 return (bstp_set_port_priority(&bif->bif_stp, req->ifbr_priority)); 1715 } 1716 1717 static int 1718 bridge_ioctl_sifcost(struct bridge_softc *sc, void *arg) 1719 { 1720 struct ifbreq *req = arg; 1721 struct bridge_iflist *bif; 1722 1723 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1724 if (bif == NULL) 1725 return (ENOENT); 1726 1727 return (bstp_set_path_cost(&bif->bif_stp, req->ifbr_path_cost)); 1728 } 1729 1730 static int 1731 bridge_ioctl_sifmaxaddr(struct bridge_softc *sc, void *arg) 1732 { 1733 struct ifbreq *req = arg; 1734 struct bridge_iflist *bif; 1735 1736 bif = bridge_lookup_member(sc, req->ifbr_ifsname); 1737 if (bif == NULL) 1738 return (ENOENT); 1739 1740 bif->bif_addrmax = req->ifbr_addrmax; 1741 return (0); 1742 } 1743 1744 static int 1745 bridge_ioctl_addspan(struct bridge_softc *sc, void *arg) 1746 { 1747 struct ifbreq *req = arg; 1748 struct bridge_iflist *bif = NULL; 1749 struct ifnet *ifs; 1750 1751 ifs = ifunit(req->ifbr_ifsname); 1752 if (ifs == NULL) 1753 return (ENOENT); 1754 1755 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1756 if (ifs == bif->bif_ifp) 1757 return (EBUSY); 1758 1759 if (ifs->if_bridge != NULL) 1760 return (EBUSY); 1761 1762 switch (ifs->if_type) { 1763 case IFT_ETHER: 1764 case IFT_GIF: 1765 case IFT_L2VLAN: 1766 break; 1767 default: 1768 return (EINVAL); 1769 } 1770 1771 bif = malloc(sizeof(*bif), M_DEVBUF, M_NOWAIT|M_ZERO); 1772 if (bif == NULL) 1773 return (ENOMEM); 1774 1775 bif->bif_ifp = ifs; 1776 bif->bif_flags = IFBIF_SPAN; 1777 1778 CK_LIST_INSERT_HEAD(&sc->sc_spanlist, bif, bif_next); 1779 1780 return (0); 1781 } 1782 1783 static int 1784 bridge_ioctl_delspan(struct bridge_softc *sc, void *arg) 1785 { 1786 struct ifbreq *req = arg; 1787 struct bridge_iflist *bif; 1788 struct ifnet *ifs; 1789 1790 ifs = ifunit(req->ifbr_ifsname); 1791 if (ifs == NULL) 1792 return (ENOENT); 1793 1794 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1795 if (ifs == bif->bif_ifp) 1796 break; 1797 1798 if (bif == NULL) 1799 return (ENOENT); 1800 1801 bridge_delete_span(sc, bif); 1802 1803 return (0); 1804 } 1805 1806 static int 1807 bridge_ioctl_gbparam(struct bridge_softc *sc, void *arg) 1808 { 1809 struct ifbropreq *req = arg; 1810 struct bstp_state *bs = &sc->sc_stp; 1811 struct bstp_port *root_port; 1812 1813 req->ifbop_maxage = bs->bs_bridge_max_age >> 8; 1814 req->ifbop_hellotime = bs->bs_bridge_htime >> 8; 1815 req->ifbop_fwddelay = bs->bs_bridge_fdelay >> 8; 1816 1817 root_port = bs->bs_root_port; 1818 if (root_port == NULL) 1819 req->ifbop_root_port = 0; 1820 else 1821 req->ifbop_root_port = root_port->bp_ifp->if_index; 1822 1823 req->ifbop_holdcount = bs->bs_txholdcount; 1824 req->ifbop_priority = bs->bs_bridge_priority; 1825 req->ifbop_protocol = bs->bs_protover; 1826 req->ifbop_root_path_cost = bs->bs_root_pv.pv_cost; 1827 req->ifbop_bridgeid = bs->bs_bridge_pv.pv_dbridge_id; 1828 req->ifbop_designated_root = bs->bs_root_pv.pv_root_id; 1829 req->ifbop_designated_bridge = bs->bs_root_pv.pv_dbridge_id; 1830 req->ifbop_last_tc_time.tv_sec = bs->bs_last_tc_time.tv_sec; 1831 req->ifbop_last_tc_time.tv_usec = bs->bs_last_tc_time.tv_usec; 1832 1833 return (0); 1834 } 1835 1836 static int 1837 bridge_ioctl_grte(struct bridge_softc *sc, void *arg) 1838 { 1839 struct ifbrparam *param = arg; 1840 1841 param->ifbrp_cexceeded = sc->sc_brtexceeded; 1842 return (0); 1843 } 1844 1845 static int 1846 bridge_ioctl_gifsstp(struct bridge_softc *sc, void *arg) 1847 { 1848 struct ifbpstpconf *bifstp = arg; 1849 struct bridge_iflist *bif; 1850 struct bstp_port *bp; 1851 struct ifbpstpreq bpreq; 1852 char *buf, *outbuf; 1853 int count, buflen, len, error = 0; 1854 1855 count = 0; 1856 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1857 if ((bif->bif_flags & IFBIF_STP) != 0) 1858 count++; 1859 } 1860 1861 buflen = sizeof(bpreq) * count; 1862 if (bifstp->ifbpstp_len == 0) { 1863 bifstp->ifbpstp_len = buflen; 1864 return (0); 1865 } 1866 1867 outbuf = malloc(buflen, M_TEMP, M_NOWAIT | M_ZERO); 1868 if (outbuf == NULL) 1869 return (ENOMEM); 1870 1871 count = 0; 1872 buf = outbuf; 1873 len = min(bifstp->ifbpstp_len, buflen); 1874 bzero(&bpreq, sizeof(bpreq)); 1875 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 1876 if (len < sizeof(bpreq)) 1877 break; 1878 1879 if ((bif->bif_flags & IFBIF_STP) == 0) 1880 continue; 1881 1882 bp = &bif->bif_stp; 1883 bpreq.ifbp_portno = bif->bif_ifp->if_index & 0xfff; 1884 bpreq.ifbp_fwd_trans = bp->bp_forward_transitions; 1885 bpreq.ifbp_design_cost = bp->bp_desg_pv.pv_cost; 1886 bpreq.ifbp_design_port = bp->bp_desg_pv.pv_port_id; 1887 bpreq.ifbp_design_bridge = bp->bp_desg_pv.pv_dbridge_id; 1888 bpreq.ifbp_design_root = bp->bp_desg_pv.pv_root_id; 1889 1890 memcpy(buf, &bpreq, sizeof(bpreq)); 1891 count++; 1892 buf += sizeof(bpreq); 1893 len -= sizeof(bpreq); 1894 } 1895 1896 bifstp->ifbpstp_len = sizeof(bpreq) * count; 1897 error = copyout(outbuf, bifstp->ifbpstp_req, bifstp->ifbpstp_len); 1898 free(outbuf, M_TEMP); 1899 return (error); 1900 } 1901 1902 static int 1903 bridge_ioctl_sproto(struct bridge_softc *sc, void *arg) 1904 { 1905 struct ifbrparam *param = arg; 1906 1907 return (bstp_set_protocol(&sc->sc_stp, param->ifbrp_proto)); 1908 } 1909 1910 static int 1911 bridge_ioctl_stxhc(struct bridge_softc *sc, void *arg) 1912 { 1913 struct ifbrparam *param = arg; 1914 1915 return (bstp_set_holdcount(&sc->sc_stp, param->ifbrp_txhc)); 1916 } 1917 1918 /* 1919 * bridge_ifdetach: 1920 * 1921 * Detach an interface from a bridge. Called when a member 1922 * interface is detaching. 1923 */ 1924 static void 1925 bridge_ifdetach(void *arg __unused, struct ifnet *ifp) 1926 { 1927 struct bridge_softc *sc = ifp->if_bridge; 1928 struct bridge_iflist *bif; 1929 1930 if (ifp->if_flags & IFF_RENAMING) 1931 return; 1932 if (V_bridge_cloner == NULL) { 1933 /* 1934 * This detach handler can be called after 1935 * vnet_bridge_uninit(). Just return in that case. 1936 */ 1937 return; 1938 } 1939 /* Check if the interface is a bridge member */ 1940 if (sc != NULL) { 1941 BRIDGE_LOCK(sc); 1942 1943 bif = bridge_lookup_member_if(sc, ifp); 1944 if (bif != NULL) 1945 bridge_delete_member(sc, bif, 1); 1946 1947 BRIDGE_UNLOCK(sc); 1948 return; 1949 } 1950 1951 /* Check if the interface is a span port */ 1952 BRIDGE_LIST_LOCK(); 1953 LIST_FOREACH(sc, &V_bridge_list, sc_list) { 1954 BRIDGE_LOCK(sc); 1955 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) 1956 if (ifp == bif->bif_ifp) { 1957 bridge_delete_span(sc, bif); 1958 break; 1959 } 1960 1961 BRIDGE_UNLOCK(sc); 1962 } 1963 BRIDGE_LIST_UNLOCK(); 1964 } 1965 1966 /* 1967 * bridge_init: 1968 * 1969 * Initialize a bridge interface. 1970 */ 1971 static void 1972 bridge_init(void *xsc) 1973 { 1974 struct bridge_softc *sc = (struct bridge_softc *)xsc; 1975 struct ifnet *ifp = sc->sc_ifp; 1976 1977 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 1978 return; 1979 1980 BRIDGE_LOCK(sc); 1981 callout_reset(&sc->sc_brcallout, bridge_rtable_prune_period * hz, 1982 bridge_timer, sc); 1983 1984 ifp->if_drv_flags |= IFF_DRV_RUNNING; 1985 bstp_init(&sc->sc_stp); /* Initialize Spanning Tree */ 1986 1987 BRIDGE_UNLOCK(sc); 1988 } 1989 1990 /* 1991 * bridge_stop: 1992 * 1993 * Stop the bridge interface. 1994 */ 1995 static void 1996 bridge_stop(struct ifnet *ifp, int disable) 1997 { 1998 struct bridge_softc *sc = ifp->if_softc; 1999 2000 BRIDGE_LOCK_ASSERT(sc); 2001 2002 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2003 return; 2004 2005 BRIDGE_RT_LOCK(sc); 2006 callout_stop(&sc->sc_brcallout); 2007 2008 bstp_stop(&sc->sc_stp); 2009 2010 bridge_rtflush(sc, IFBF_FLUSHDYN); 2011 BRIDGE_RT_UNLOCK(sc); 2012 2013 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 2014 } 2015 2016 /* 2017 * bridge_enqueue: 2018 * 2019 * Enqueue a packet on a bridge member interface. 2020 * 2021 */ 2022 static int 2023 bridge_enqueue(struct bridge_softc *sc, struct ifnet *dst_ifp, struct mbuf *m) 2024 { 2025 int len, err = 0; 2026 short mflags; 2027 struct mbuf *m0; 2028 2029 /* We may be sending a fragment so traverse the mbuf */ 2030 for (; m; m = m0) { 2031 m0 = m->m_nextpkt; 2032 m->m_nextpkt = NULL; 2033 len = m->m_pkthdr.len; 2034 mflags = m->m_flags; 2035 2036 /* 2037 * If underlying interface can not do VLAN tag insertion itself 2038 * then attach a packet tag that holds it. 2039 */ 2040 if ((m->m_flags & M_VLANTAG) && 2041 (dst_ifp->if_capenable & IFCAP_VLAN_HWTAGGING) == 0) { 2042 m = ether_vlanencap(m, m->m_pkthdr.ether_vtag); 2043 if (m == NULL) { 2044 if_printf(dst_ifp, 2045 "unable to prepend VLAN header\n"); 2046 if_inc_counter(dst_ifp, IFCOUNTER_OERRORS, 1); 2047 continue; 2048 } 2049 m->m_flags &= ~M_VLANTAG; 2050 } 2051 2052 M_ASSERTPKTHDR(m); /* We shouldn't transmit mbuf without pkthdr */ 2053 if ((err = dst_ifp->if_transmit(dst_ifp, m))) { 2054 int n; 2055 2056 for (m = m0, n = 1; m != NULL; m = m0, n++) { 2057 m0 = m->m_nextpkt; 2058 m_freem(m); 2059 } 2060 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, n); 2061 break; 2062 } 2063 2064 if_inc_counter(sc->sc_ifp, IFCOUNTER_OPACKETS, 1); 2065 if_inc_counter(sc->sc_ifp, IFCOUNTER_OBYTES, len); 2066 if (mflags & M_MCAST) 2067 if_inc_counter(sc->sc_ifp, IFCOUNTER_OMCASTS, 1); 2068 } 2069 2070 return (err); 2071 } 2072 2073 /* 2074 * bridge_dummynet: 2075 * 2076 * Receive a queued packet from dummynet and pass it on to the output 2077 * interface. 2078 * 2079 * The mbuf has the Ethernet header already attached. 2080 */ 2081 static void 2082 bridge_dummynet(struct mbuf *m, struct ifnet *ifp) 2083 { 2084 struct bridge_softc *sc; 2085 2086 sc = ifp->if_bridge; 2087 2088 /* 2089 * The packet didnt originate from a member interface. This should only 2090 * ever happen if a member interface is removed while packets are 2091 * queued for it. 2092 */ 2093 if (sc == NULL) { 2094 m_freem(m); 2095 return; 2096 } 2097 2098 if (PFIL_HOOKED_OUT(V_inet_pfil_head) 2099 #ifdef INET6 2100 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2101 #endif 2102 ) { 2103 if (bridge_pfil(&m, sc->sc_ifp, ifp, PFIL_OUT) != 0) 2104 return; 2105 if (m == NULL) 2106 return; 2107 } 2108 2109 bridge_enqueue(sc, ifp, m); 2110 } 2111 2112 /* 2113 * bridge_output: 2114 * 2115 * Send output from a bridge member interface. This 2116 * performs the bridging function for locally originated 2117 * packets. 2118 * 2119 * The mbuf has the Ethernet header already attached. We must 2120 * enqueue or free the mbuf before returning. 2121 */ 2122 static int 2123 bridge_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *sa, 2124 struct rtentry *rt) 2125 { 2126 struct ether_header *eh; 2127 struct ifnet *bifp, *dst_if; 2128 struct bridge_softc *sc; 2129 uint16_t vlan; 2130 2131 NET_EPOCH_ASSERT(); 2132 2133 if (m->m_len < ETHER_HDR_LEN) { 2134 m = m_pullup(m, ETHER_HDR_LEN); 2135 if (m == NULL) 2136 return (0); 2137 } 2138 2139 eh = mtod(m, struct ether_header *); 2140 sc = ifp->if_bridge; 2141 vlan = VLANTAGOF(m); 2142 2143 bifp = sc->sc_ifp; 2144 2145 /* 2146 * If bridge is down, but the original output interface is up, 2147 * go ahead and send out that interface. Otherwise, the packet 2148 * is dropped below. 2149 */ 2150 if ((bifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2151 dst_if = ifp; 2152 goto sendunicast; 2153 } 2154 2155 /* 2156 * If the packet is a multicast, or we don't know a better way to 2157 * get there, send to all interfaces. 2158 */ 2159 if (ETHER_IS_MULTICAST(eh->ether_dhost)) 2160 dst_if = NULL; 2161 else 2162 dst_if = bridge_rtlookup(sc, eh->ether_dhost, vlan); 2163 /* Tap any traffic not passing back out the originating interface */ 2164 if (dst_if != ifp) 2165 ETHER_BPF_MTAP(bifp, m); 2166 if (dst_if == NULL) { 2167 struct bridge_iflist *bif; 2168 struct mbuf *mc; 2169 int used = 0; 2170 2171 bridge_span(sc, m); 2172 2173 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 2174 dst_if = bif->bif_ifp; 2175 2176 if (dst_if->if_type == IFT_GIF) 2177 continue; 2178 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2179 continue; 2180 2181 /* 2182 * If this is not the original output interface, 2183 * and the interface is participating in spanning 2184 * tree, make sure the port is in a state that 2185 * allows forwarding. 2186 */ 2187 if (dst_if != ifp && (bif->bif_flags & IFBIF_STP) && 2188 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2189 continue; 2190 2191 if (CK_LIST_NEXT(bif, bif_next) == NULL) { 2192 used = 1; 2193 mc = m; 2194 } else { 2195 mc = m_dup(m, M_NOWAIT); 2196 if (mc == NULL) { 2197 if_inc_counter(bifp, IFCOUNTER_OERRORS, 1); 2198 continue; 2199 } 2200 } 2201 2202 bridge_enqueue(sc, dst_if, mc); 2203 } 2204 if (used == 0) 2205 m_freem(m); 2206 return (0); 2207 } 2208 2209 sendunicast: 2210 /* 2211 * XXX Spanning tree consideration here? 2212 */ 2213 2214 bridge_span(sc, m); 2215 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) { 2216 m_freem(m); 2217 return (0); 2218 } 2219 2220 bridge_enqueue(sc, dst_if, m); 2221 return (0); 2222 } 2223 2224 /* 2225 * bridge_transmit: 2226 * 2227 * Do output on a bridge. 2228 * 2229 */ 2230 static int 2231 bridge_transmit(struct ifnet *ifp, struct mbuf *m) 2232 { 2233 struct bridge_softc *sc; 2234 struct ether_header *eh; 2235 struct ifnet *dst_if; 2236 int error = 0; 2237 2238 sc = ifp->if_softc; 2239 2240 ETHER_BPF_MTAP(ifp, m); 2241 2242 eh = mtod(m, struct ether_header *); 2243 2244 if (((m->m_flags & (M_BCAST|M_MCAST)) == 0) && 2245 (dst_if = bridge_rtlookup(sc, eh->ether_dhost, 1)) != NULL) { 2246 error = bridge_enqueue(sc, dst_if, m); 2247 } else 2248 bridge_broadcast(sc, ifp, m, 0); 2249 2250 return (error); 2251 } 2252 2253 #ifdef ALTQ 2254 static void 2255 bridge_altq_start(if_t ifp) 2256 { 2257 struct ifaltq *ifq = &ifp->if_snd; 2258 struct mbuf *m; 2259 2260 IFQ_LOCK(ifq); 2261 IFQ_DEQUEUE_NOLOCK(ifq, m); 2262 while (m != NULL) { 2263 bridge_transmit(ifp, m); 2264 IFQ_DEQUEUE_NOLOCK(ifq, m); 2265 } 2266 IFQ_UNLOCK(ifq); 2267 } 2268 2269 static int 2270 bridge_altq_transmit(if_t ifp, struct mbuf *m) 2271 { 2272 int err; 2273 2274 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 2275 IFQ_ENQUEUE(&ifp->if_snd, m, err); 2276 if (err == 0) 2277 bridge_altq_start(ifp); 2278 } else 2279 err = bridge_transmit(ifp, m); 2280 2281 return (err); 2282 } 2283 #endif /* ALTQ */ 2284 2285 /* 2286 * The ifp->if_qflush entry point for if_bridge(4) is no-op. 2287 */ 2288 static void 2289 bridge_qflush(struct ifnet *ifp __unused) 2290 { 2291 } 2292 2293 /* 2294 * bridge_forward: 2295 * 2296 * The forwarding function of the bridge. 2297 * 2298 * NOTE: Releases the lock on return. 2299 */ 2300 static void 2301 bridge_forward(struct bridge_softc *sc, struct bridge_iflist *sbif, 2302 struct mbuf *m) 2303 { 2304 struct bridge_iflist *dbif; 2305 struct ifnet *src_if, *dst_if, *ifp; 2306 struct ether_header *eh; 2307 uint16_t vlan; 2308 uint8_t *dst; 2309 int error; 2310 2311 NET_EPOCH_ASSERT(); 2312 2313 src_if = m->m_pkthdr.rcvif; 2314 ifp = sc->sc_ifp; 2315 2316 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 2317 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2318 vlan = VLANTAGOF(m); 2319 2320 if ((sbif->bif_flags & IFBIF_STP) && 2321 sbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2322 goto drop; 2323 2324 eh = mtod(m, struct ether_header *); 2325 dst = eh->ether_dhost; 2326 2327 /* If the interface is learning, record the address. */ 2328 if (sbif->bif_flags & IFBIF_LEARNING) { 2329 error = bridge_rtupdate(sc, eh->ether_shost, vlan, 2330 sbif, 0, IFBAF_DYNAMIC); 2331 /* 2332 * If the interface has addresses limits then deny any source 2333 * that is not in the cache. 2334 */ 2335 if (error && sbif->bif_addrmax) 2336 goto drop; 2337 } 2338 2339 if ((sbif->bif_flags & IFBIF_STP) != 0 && 2340 sbif->bif_stp.bp_state == BSTP_IFSTATE_LEARNING) 2341 goto drop; 2342 2343 /* 2344 * At this point, the port either doesn't participate 2345 * in spanning tree or it is in the forwarding state. 2346 */ 2347 2348 /* 2349 * If the packet is unicast, destined for someone on 2350 * "this" side of the bridge, drop it. 2351 */ 2352 if ((m->m_flags & (M_BCAST|M_MCAST)) == 0) { 2353 dst_if = bridge_rtlookup(sc, dst, vlan); 2354 if (src_if == dst_if) 2355 goto drop; 2356 } else { 2357 /* 2358 * Check if its a reserved multicast address, any address 2359 * listed in 802.1D section 7.12.6 may not be forwarded by the 2360 * bridge. 2361 * This is currently 01-80-C2-00-00-00 to 01-80-C2-00-00-0F 2362 */ 2363 if (dst[0] == 0x01 && dst[1] == 0x80 && 2364 dst[2] == 0xc2 && dst[3] == 0x00 && 2365 dst[4] == 0x00 && dst[5] <= 0x0f) 2366 goto drop; 2367 2368 /* ...forward it to all interfaces. */ 2369 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1); 2370 dst_if = NULL; 2371 } 2372 2373 /* 2374 * If we have a destination interface which is a member of our bridge, 2375 * OR this is a unicast packet, push it through the bpf(4) machinery. 2376 * For broadcast or multicast packets, don't bother because it will 2377 * be reinjected into ether_input. We do this before we pass the packets 2378 * through the pfil(9) framework, as it is possible that pfil(9) will 2379 * drop the packet, or possibly modify it, making it difficult to debug 2380 * firewall issues on the bridge. 2381 */ 2382 if (dst_if != NULL || (m->m_flags & (M_BCAST | M_MCAST)) == 0) 2383 ETHER_BPF_MTAP(ifp, m); 2384 2385 /* run the packet filter */ 2386 if (PFIL_HOOKED_IN(V_inet_pfil_head) 2387 #ifdef INET6 2388 || PFIL_HOOKED_IN(V_inet6_pfil_head) 2389 #endif 2390 ) { 2391 if (bridge_pfil(&m, ifp, src_if, PFIL_IN) != 0) 2392 return; 2393 if (m == NULL) 2394 return; 2395 } 2396 2397 if (dst_if == NULL) { 2398 bridge_broadcast(sc, src_if, m, 1); 2399 return; 2400 } 2401 2402 /* 2403 * At this point, we're dealing with a unicast frame 2404 * going to a different interface. 2405 */ 2406 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2407 goto drop; 2408 2409 dbif = bridge_lookup_member_if(sc, dst_if); 2410 if (dbif == NULL) 2411 /* Not a member of the bridge (anymore?) */ 2412 goto drop; 2413 2414 /* Private segments can not talk to each other */ 2415 if (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE) 2416 goto drop; 2417 2418 if ((dbif->bif_flags & IFBIF_STP) && 2419 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2420 goto drop; 2421 2422 if (PFIL_HOOKED_OUT(V_inet_pfil_head) 2423 #ifdef INET6 2424 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2425 #endif 2426 ) { 2427 if (bridge_pfil(&m, ifp, dst_if, PFIL_OUT) != 0) 2428 return; 2429 if (m == NULL) 2430 return; 2431 } 2432 2433 bridge_enqueue(sc, dst_if, m); 2434 return; 2435 2436 drop: 2437 m_freem(m); 2438 } 2439 2440 /* 2441 * bridge_input: 2442 * 2443 * Receive input from a member interface. Queue the packet for 2444 * bridging if it is not for us. 2445 */ 2446 static struct mbuf * 2447 bridge_input(struct ifnet *ifp, struct mbuf *m) 2448 { 2449 struct bridge_softc *sc = ifp->if_bridge; 2450 struct bridge_iflist *bif, *bif2; 2451 struct ifnet *bifp; 2452 struct ether_header *eh; 2453 struct mbuf *mc, *mc2; 2454 uint16_t vlan; 2455 int error; 2456 2457 NET_EPOCH_ASSERT(); 2458 2459 if ((sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) 2460 return (m); 2461 2462 bifp = sc->sc_ifp; 2463 vlan = VLANTAGOF(m); 2464 2465 /* 2466 * Implement support for bridge monitoring. If this flag has been 2467 * set on this interface, discard the packet once we push it through 2468 * the bpf(4) machinery, but before we do, increment the byte and 2469 * packet counters associated with this interface. 2470 */ 2471 if ((bifp->if_flags & IFF_MONITOR) != 0) { 2472 m->m_pkthdr.rcvif = bifp; 2473 ETHER_BPF_MTAP(bifp, m); 2474 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); 2475 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 2476 m_freem(m); 2477 return (NULL); 2478 } 2479 bif = bridge_lookup_member_if(sc, ifp); 2480 if (bif == NULL) { 2481 return (m); 2482 } 2483 2484 eh = mtod(m, struct ether_header *); 2485 2486 bridge_span(sc, m); 2487 2488 if (m->m_flags & (M_BCAST|M_MCAST)) { 2489 /* Tap off 802.1D packets; they do not get forwarded. */ 2490 if (memcmp(eh->ether_dhost, bstp_etheraddr, 2491 ETHER_ADDR_LEN) == 0) { 2492 bstp_input(&bif->bif_stp, ifp, m); /* consumes mbuf */ 2493 return (NULL); 2494 } 2495 2496 if ((bif->bif_flags & IFBIF_STP) && 2497 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2498 return (m); 2499 } 2500 2501 /* 2502 * Make a deep copy of the packet and enqueue the copy 2503 * for bridge processing; return the original packet for 2504 * local processing. 2505 */ 2506 mc = m_dup(m, M_NOWAIT); 2507 if (mc == NULL) { 2508 return (m); 2509 } 2510 2511 /* Perform the bridge forwarding function with the copy. */ 2512 bridge_forward(sc, bif, mc); 2513 2514 /* 2515 * Reinject the mbuf as arriving on the bridge so we have a 2516 * chance at claiming multicast packets. We can not loop back 2517 * here from ether_input as a bridge is never a member of a 2518 * bridge. 2519 */ 2520 KASSERT(bifp->if_bridge == NULL, 2521 ("loop created in bridge_input")); 2522 mc2 = m_dup(m, M_NOWAIT); 2523 if (mc2 != NULL) { 2524 /* Keep the layer3 header aligned */ 2525 int i = min(mc2->m_pkthdr.len, max_protohdr); 2526 mc2 = m_copyup(mc2, i, ETHER_ALIGN); 2527 } 2528 if (mc2 != NULL) { 2529 mc2->m_pkthdr.rcvif = bifp; 2530 (*bifp->if_input)(bifp, mc2); 2531 } 2532 2533 /* Return the original packet for local processing. */ 2534 return (m); 2535 } 2536 2537 if ((bif->bif_flags & IFBIF_STP) && 2538 bif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) { 2539 return (m); 2540 } 2541 2542 #if defined(INET) || defined(INET6) 2543 #define CARP_CHECK_WE_ARE_DST(iface) \ 2544 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_dhost)) 2545 #define CARP_CHECK_WE_ARE_SRC(iface) \ 2546 ((iface)->if_carp && (*carp_forus_p)((iface), eh->ether_shost)) 2547 #else 2548 #define CARP_CHECK_WE_ARE_DST(iface) false 2549 #define CARP_CHECK_WE_ARE_SRC(iface) false 2550 #endif 2551 2552 #ifdef INET6 2553 #define PFIL_HOOKED_INET6 PFIL_HOOKED_IN(V_inet6_pfil_head) 2554 #else 2555 #define PFIL_HOOKED_INET6 false 2556 #endif 2557 2558 #define GRAB_OUR_PACKETS(iface) \ 2559 if ((iface)->if_type == IFT_GIF) \ 2560 continue; \ 2561 /* It is destined for us. */ \ 2562 if (memcmp(IF_LLADDR(iface), eh->ether_dhost, ETHER_ADDR_LEN) == 0 || \ 2563 CARP_CHECK_WE_ARE_DST(iface)) { \ 2564 if (bif->bif_flags & IFBIF_LEARNING) { \ 2565 error = bridge_rtupdate(sc, eh->ether_shost, \ 2566 vlan, bif, 0, IFBAF_DYNAMIC); \ 2567 if (error && bif->bif_addrmax) { \ 2568 m_freem(m); \ 2569 return (NULL); \ 2570 } \ 2571 } \ 2572 m->m_pkthdr.rcvif = iface; \ 2573 if ((iface) == ifp) { \ 2574 /* Skip bridge processing... src == dest */ \ 2575 return (m); \ 2576 } \ 2577 /* It's passing over or to the bridge, locally. */ \ 2578 ETHER_BPF_MTAP(bifp, m); \ 2579 if_inc_counter(bifp, IFCOUNTER_IPACKETS, 1); \ 2580 if_inc_counter(bifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); \ 2581 /* Filter on the physical interface. */ \ 2582 if (V_pfil_local_phys && (PFIL_HOOKED_IN(V_inet_pfil_head) || \ 2583 PFIL_HOOKED_INET6)) { \ 2584 if (bridge_pfil(&m, NULL, ifp, \ 2585 PFIL_IN) != 0 || m == NULL) { \ 2586 return (NULL); \ 2587 } \ 2588 } \ 2589 if ((iface) != bifp) \ 2590 ETHER_BPF_MTAP(iface, m); \ 2591 return (m); \ 2592 } \ 2593 \ 2594 /* We just received a packet that we sent out. */ \ 2595 if (memcmp(IF_LLADDR(iface), eh->ether_shost, ETHER_ADDR_LEN) == 0 || \ 2596 CARP_CHECK_WE_ARE_SRC(iface)) { \ 2597 m_freem(m); \ 2598 return (NULL); \ 2599 } 2600 2601 /* 2602 * Unicast. Make sure it's not for the bridge. 2603 */ 2604 do { GRAB_OUR_PACKETS(bifp) } while (0); 2605 2606 /* 2607 * Give a chance for ifp at first priority. This will help when the 2608 * packet comes through the interface like VLAN's with the same MACs 2609 * on several interfaces from the same bridge. This also will save 2610 * some CPU cycles in case the destination interface and the input 2611 * interface (eq ifp) are the same. 2612 */ 2613 do { GRAB_OUR_PACKETS(ifp) } while (0); 2614 2615 /* Now check the all bridge members. */ 2616 CK_LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) { 2617 GRAB_OUR_PACKETS(bif2->bif_ifp) 2618 } 2619 2620 #undef CARP_CHECK_WE_ARE_DST 2621 #undef CARP_CHECK_WE_ARE_SRC 2622 #undef PFIL_HOOKED_INET6 2623 #undef GRAB_OUR_PACKETS 2624 2625 /* Perform the bridge forwarding function. */ 2626 bridge_forward(sc, bif, m); 2627 2628 return (NULL); 2629 } 2630 2631 /* 2632 * bridge_broadcast: 2633 * 2634 * Send a frame to all interfaces that are members of 2635 * the bridge, except for the one on which the packet 2636 * arrived. 2637 * 2638 * NOTE: Releases the lock on return. 2639 */ 2640 static void 2641 bridge_broadcast(struct bridge_softc *sc, struct ifnet *src_if, 2642 struct mbuf *m, int runfilt) 2643 { 2644 struct bridge_iflist *dbif, *sbif; 2645 struct mbuf *mc; 2646 struct ifnet *dst_if; 2647 int used = 0, i; 2648 2649 NET_EPOCH_ASSERT(); 2650 2651 sbif = bridge_lookup_member_if(sc, src_if); 2652 2653 /* Filter on the bridge interface before broadcasting */ 2654 if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head) 2655 #ifdef INET6 2656 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2657 #endif 2658 )) { 2659 if (bridge_pfil(&m, sc->sc_ifp, NULL, PFIL_OUT) != 0) 2660 return; 2661 if (m == NULL) 2662 return; 2663 } 2664 2665 CK_LIST_FOREACH(dbif, &sc->sc_iflist, bif_next) { 2666 dst_if = dbif->bif_ifp; 2667 if (dst_if == src_if) 2668 continue; 2669 2670 /* Private segments can not talk to each other */ 2671 if (sbif && (sbif->bif_flags & dbif->bif_flags & IFBIF_PRIVATE)) 2672 continue; 2673 2674 if ((dbif->bif_flags & IFBIF_STP) && 2675 dbif->bif_stp.bp_state == BSTP_IFSTATE_DISCARDING) 2676 continue; 2677 2678 if ((dbif->bif_flags & IFBIF_DISCOVER) == 0 && 2679 (m->m_flags & (M_BCAST|M_MCAST)) == 0) 2680 continue; 2681 2682 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2683 continue; 2684 2685 if (CK_LIST_NEXT(dbif, bif_next) == NULL) { 2686 mc = m; 2687 used = 1; 2688 } else { 2689 mc = m_dup(m, M_NOWAIT); 2690 if (mc == NULL) { 2691 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2692 continue; 2693 } 2694 } 2695 2696 /* 2697 * Filter on the output interface. Pass a NULL bridge interface 2698 * pointer so we do not redundantly filter on the bridge for 2699 * each interface we broadcast on. 2700 */ 2701 if (runfilt && (PFIL_HOOKED_OUT(V_inet_pfil_head) 2702 #ifdef INET6 2703 || PFIL_HOOKED_OUT(V_inet6_pfil_head) 2704 #endif 2705 )) { 2706 if (used == 0) { 2707 /* Keep the layer3 header aligned */ 2708 i = min(mc->m_pkthdr.len, max_protohdr); 2709 mc = m_copyup(mc, i, ETHER_ALIGN); 2710 if (mc == NULL) { 2711 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2712 continue; 2713 } 2714 } 2715 if (bridge_pfil(&mc, NULL, dst_if, PFIL_OUT) != 0) 2716 continue; 2717 if (mc == NULL) 2718 continue; 2719 } 2720 2721 bridge_enqueue(sc, dst_if, mc); 2722 } 2723 if (used == 0) 2724 m_freem(m); 2725 } 2726 2727 /* 2728 * bridge_span: 2729 * 2730 * Duplicate a packet out one or more interfaces that are in span mode, 2731 * the original mbuf is unmodified. 2732 */ 2733 static void 2734 bridge_span(struct bridge_softc *sc, struct mbuf *m) 2735 { 2736 struct bridge_iflist *bif; 2737 struct ifnet *dst_if; 2738 struct mbuf *mc; 2739 2740 NET_EPOCH_ASSERT(); 2741 2742 if (CK_LIST_EMPTY(&sc->sc_spanlist)) 2743 return; 2744 2745 CK_LIST_FOREACH(bif, &sc->sc_spanlist, bif_next) { 2746 dst_if = bif->bif_ifp; 2747 2748 if ((dst_if->if_drv_flags & IFF_DRV_RUNNING) == 0) 2749 continue; 2750 2751 mc = m_dup(m, M_NOWAIT); 2752 if (mc == NULL) { 2753 if_inc_counter(sc->sc_ifp, IFCOUNTER_OERRORS, 1); 2754 continue; 2755 } 2756 2757 bridge_enqueue(sc, dst_if, mc); 2758 } 2759 } 2760 2761 /* 2762 * bridge_rtupdate: 2763 * 2764 * Add a bridge routing entry. 2765 */ 2766 static int 2767 bridge_rtupdate(struct bridge_softc *sc, const uint8_t *dst, uint16_t vlan, 2768 struct bridge_iflist *bif, int setflags, uint8_t flags) 2769 { 2770 struct bridge_rtnode *brt; 2771 int error; 2772 2773 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 2774 2775 /* Check the source address is valid and not multicast. */ 2776 if (ETHER_IS_MULTICAST(dst) || 2777 (dst[0] == 0 && dst[1] == 0 && dst[2] == 0 && 2778 dst[3] == 0 && dst[4] == 0 && dst[5] == 0) != 0) 2779 return (EINVAL); 2780 2781 /* 802.1p frames map to vlan 1 */ 2782 if (vlan == 0) 2783 vlan = 1; 2784 2785 /* 2786 * A route for this destination might already exist. If so, 2787 * update it, otherwise create a new one. 2788 */ 2789 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) == NULL) { 2790 BRIDGE_RT_LOCK(sc); 2791 2792 /* Check again, now that we have the lock. There could have 2793 * been a race and we only want to insert this once. */ 2794 if ((brt = bridge_rtnode_lookup(sc, dst, vlan)) != NULL) { 2795 BRIDGE_RT_UNLOCK(sc); 2796 return (0); 2797 } 2798 2799 if (sc->sc_brtcnt >= sc->sc_brtmax) { 2800 sc->sc_brtexceeded++; 2801 BRIDGE_RT_UNLOCK(sc); 2802 return (ENOSPC); 2803 } 2804 /* Check per interface address limits (if enabled) */ 2805 if (bif->bif_addrmax && bif->bif_addrcnt >= bif->bif_addrmax) { 2806 bif->bif_addrexceeded++; 2807 BRIDGE_RT_UNLOCK(sc); 2808 return (ENOSPC); 2809 } 2810 2811 /* 2812 * Allocate a new bridge forwarding node, and 2813 * initialize the expiration time and Ethernet 2814 * address. 2815 */ 2816 brt = uma_zalloc(V_bridge_rtnode_zone, M_NOWAIT | M_ZERO); 2817 if (brt == NULL) { 2818 BRIDGE_RT_UNLOCK(sc); 2819 return (ENOMEM); 2820 } 2821 brt->brt_vnet = curvnet; 2822 2823 if (bif->bif_flags & IFBIF_STICKY) 2824 brt->brt_flags = IFBAF_STICKY; 2825 else 2826 brt->brt_flags = IFBAF_DYNAMIC; 2827 2828 memcpy(brt->brt_addr, dst, ETHER_ADDR_LEN); 2829 brt->brt_vlan = vlan; 2830 2831 if ((error = bridge_rtnode_insert(sc, brt)) != 0) { 2832 uma_zfree(V_bridge_rtnode_zone, brt); 2833 BRIDGE_RT_UNLOCK(sc); 2834 return (error); 2835 } 2836 brt->brt_dst = bif; 2837 bif->bif_addrcnt++; 2838 2839 BRIDGE_RT_UNLOCK(sc); 2840 } 2841 2842 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC && 2843 brt->brt_dst != bif) { 2844 BRIDGE_RT_LOCK(sc); 2845 brt->brt_dst->bif_addrcnt--; 2846 brt->brt_dst = bif; 2847 brt->brt_dst->bif_addrcnt++; 2848 BRIDGE_RT_UNLOCK(sc); 2849 } 2850 2851 if ((flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2852 brt->brt_expire = time_uptime + sc->sc_brttimeout; 2853 if (setflags) 2854 brt->brt_flags = flags; 2855 2856 return (0); 2857 } 2858 2859 /* 2860 * bridge_rtlookup: 2861 * 2862 * Lookup the destination interface for an address. 2863 */ 2864 static struct ifnet * 2865 bridge_rtlookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2866 { 2867 struct bridge_rtnode *brt; 2868 2869 NET_EPOCH_ASSERT(); 2870 2871 if ((brt = bridge_rtnode_lookup(sc, addr, vlan)) == NULL) 2872 return (NULL); 2873 2874 return (brt->brt_ifp); 2875 } 2876 2877 /* 2878 * bridge_rttrim: 2879 * 2880 * Trim the routine table so that we have a number 2881 * of routing entries less than or equal to the 2882 * maximum number. 2883 */ 2884 static void 2885 bridge_rttrim(struct bridge_softc *sc) 2886 { 2887 struct bridge_rtnode *brt, *nbrt; 2888 2889 NET_EPOCH_ASSERT(); 2890 BRIDGE_RT_LOCK_ASSERT(sc); 2891 2892 /* Make sure we actually need to do this. */ 2893 if (sc->sc_brtcnt <= sc->sc_brtmax) 2894 return; 2895 2896 /* Force an aging cycle; this might trim enough addresses. */ 2897 bridge_rtage(sc); 2898 if (sc->sc_brtcnt <= sc->sc_brtmax) 2899 return; 2900 2901 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2902 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2903 bridge_rtnode_destroy(sc, brt); 2904 if (sc->sc_brtcnt <= sc->sc_brtmax) 2905 return; 2906 } 2907 } 2908 } 2909 2910 /* 2911 * bridge_timer: 2912 * 2913 * Aging timer for the bridge. 2914 */ 2915 static void 2916 bridge_timer(void *arg) 2917 { 2918 struct bridge_softc *sc = arg; 2919 2920 BRIDGE_RT_LOCK_ASSERT(sc); 2921 2922 /* Destruction of rtnodes requires a proper vnet context */ 2923 CURVNET_SET(sc->sc_ifp->if_vnet); 2924 bridge_rtage(sc); 2925 2926 if (sc->sc_ifp->if_drv_flags & IFF_DRV_RUNNING) 2927 callout_reset(&sc->sc_brcallout, 2928 bridge_rtable_prune_period * hz, bridge_timer, sc); 2929 CURVNET_RESTORE(); 2930 } 2931 2932 /* 2933 * bridge_rtage: 2934 * 2935 * Perform an aging cycle. 2936 */ 2937 static void 2938 bridge_rtage(struct bridge_softc *sc) 2939 { 2940 struct bridge_rtnode *brt, *nbrt; 2941 2942 BRIDGE_RT_LOCK_ASSERT(sc); 2943 2944 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2945 if ((brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) { 2946 if (time_uptime >= brt->brt_expire) 2947 bridge_rtnode_destroy(sc, brt); 2948 } 2949 } 2950 } 2951 2952 /* 2953 * bridge_rtflush: 2954 * 2955 * Remove all dynamic addresses from the bridge. 2956 */ 2957 static void 2958 bridge_rtflush(struct bridge_softc *sc, int full) 2959 { 2960 struct bridge_rtnode *brt, *nbrt; 2961 2962 BRIDGE_RT_LOCK_ASSERT(sc); 2963 2964 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 2965 if (full || (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 2966 bridge_rtnode_destroy(sc, brt); 2967 } 2968 } 2969 2970 /* 2971 * bridge_rtdaddr: 2972 * 2973 * Remove an address from the table. 2974 */ 2975 static int 2976 bridge_rtdaddr(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 2977 { 2978 struct bridge_rtnode *brt; 2979 int found = 0; 2980 2981 BRIDGE_RT_LOCK(sc); 2982 2983 /* 2984 * If vlan is zero then we want to delete for all vlans so the lookup 2985 * may return more than one. 2986 */ 2987 while ((brt = bridge_rtnode_lookup(sc, addr, vlan)) != NULL) { 2988 bridge_rtnode_destroy(sc, brt); 2989 found = 1; 2990 } 2991 2992 BRIDGE_RT_UNLOCK(sc); 2993 2994 return (found ? 0 : ENOENT); 2995 } 2996 2997 /* 2998 * bridge_rtdelete: 2999 * 3000 * Delete routes to a speicifc member interface. 3001 */ 3002 static void 3003 bridge_rtdelete(struct bridge_softc *sc, struct ifnet *ifp, int full) 3004 { 3005 struct bridge_rtnode *brt, *nbrt; 3006 3007 BRIDGE_RT_LOCK_ASSERT(sc); 3008 3009 CK_LIST_FOREACH_SAFE(brt, &sc->sc_rtlist, brt_list, nbrt) { 3010 if (brt->brt_ifp == ifp && (full || 3011 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC)) 3012 bridge_rtnode_destroy(sc, brt); 3013 } 3014 } 3015 3016 /* 3017 * bridge_rtable_init: 3018 * 3019 * Initialize the route table for this bridge. 3020 */ 3021 static void 3022 bridge_rtable_init(struct bridge_softc *sc) 3023 { 3024 int i; 3025 3026 sc->sc_rthash = malloc(sizeof(*sc->sc_rthash) * BRIDGE_RTHASH_SIZE, 3027 M_DEVBUF, M_WAITOK); 3028 3029 for (i = 0; i < BRIDGE_RTHASH_SIZE; i++) 3030 CK_LIST_INIT(&sc->sc_rthash[i]); 3031 3032 sc->sc_rthash_key = arc4random(); 3033 CK_LIST_INIT(&sc->sc_rtlist); 3034 } 3035 3036 /* 3037 * bridge_rtable_fini: 3038 * 3039 * Deconstruct the route table for this bridge. 3040 */ 3041 static void 3042 bridge_rtable_fini(struct bridge_softc *sc) 3043 { 3044 3045 KASSERT(sc->sc_brtcnt == 0, 3046 ("%s: %d bridge routes referenced", __func__, sc->sc_brtcnt)); 3047 free(sc->sc_rthash, M_DEVBUF); 3048 } 3049 3050 /* 3051 * The following hash function is adapted from "Hash Functions" by Bob Jenkins 3052 * ("Algorithm Alley", Dr. Dobbs Journal, September 1997). 3053 */ 3054 #define mix(a, b, c) \ 3055 do { \ 3056 a -= b; a -= c; a ^= (c >> 13); \ 3057 b -= c; b -= a; b ^= (a << 8); \ 3058 c -= a; c -= b; c ^= (b >> 13); \ 3059 a -= b; a -= c; a ^= (c >> 12); \ 3060 b -= c; b -= a; b ^= (a << 16); \ 3061 c -= a; c -= b; c ^= (b >> 5); \ 3062 a -= b; a -= c; a ^= (c >> 3); \ 3063 b -= c; b -= a; b ^= (a << 10); \ 3064 c -= a; c -= b; c ^= (b >> 15); \ 3065 } while (/*CONSTCOND*/0) 3066 3067 static __inline uint32_t 3068 bridge_rthash(struct bridge_softc *sc, const uint8_t *addr) 3069 { 3070 uint32_t a = 0x9e3779b9, b = 0x9e3779b9, c = sc->sc_rthash_key; 3071 3072 b += addr[5] << 8; 3073 b += addr[4]; 3074 a += addr[3] << 24; 3075 a += addr[2] << 16; 3076 a += addr[1] << 8; 3077 a += addr[0]; 3078 3079 mix(a, b, c); 3080 3081 return (c & BRIDGE_RTHASH_MASK); 3082 } 3083 3084 #undef mix 3085 3086 static int 3087 bridge_rtnode_addr_cmp(const uint8_t *a, const uint8_t *b) 3088 { 3089 int i, d; 3090 3091 for (i = 0, d = 0; i < ETHER_ADDR_LEN && d == 0; i++) { 3092 d = ((int)a[i]) - ((int)b[i]); 3093 } 3094 3095 return (d); 3096 } 3097 3098 /* 3099 * bridge_rtnode_lookup: 3100 * 3101 * Look up a bridge route node for the specified destination. Compare the 3102 * vlan id or if zero then just return the first match. 3103 */ 3104 static struct bridge_rtnode * 3105 bridge_rtnode_lookup(struct bridge_softc *sc, const uint8_t *addr, uint16_t vlan) 3106 { 3107 struct bridge_rtnode *brt; 3108 uint32_t hash; 3109 int dir; 3110 3111 BRIDGE_RT_LOCK_OR_NET_EPOCH_ASSERT(sc); 3112 3113 hash = bridge_rthash(sc, addr); 3114 CK_LIST_FOREACH(brt, &sc->sc_rthash[hash], brt_hash) { 3115 dir = bridge_rtnode_addr_cmp(addr, brt->brt_addr); 3116 if (dir == 0 && (brt->brt_vlan == vlan || vlan == 0)) 3117 return (brt); 3118 if (dir > 0) 3119 return (NULL); 3120 } 3121 3122 return (NULL); 3123 } 3124 3125 /* 3126 * bridge_rtnode_insert: 3127 * 3128 * Insert the specified bridge node into the route table. We 3129 * assume the entry is not already in the table. 3130 */ 3131 static int 3132 bridge_rtnode_insert(struct bridge_softc *sc, struct bridge_rtnode *brt) 3133 { 3134 struct bridge_rtnode *lbrt; 3135 uint32_t hash; 3136 int dir; 3137 3138 BRIDGE_RT_LOCK_ASSERT(sc); 3139 3140 hash = bridge_rthash(sc, brt->brt_addr); 3141 3142 lbrt = CK_LIST_FIRST(&sc->sc_rthash[hash]); 3143 if (lbrt == NULL) { 3144 CK_LIST_INSERT_HEAD(&sc->sc_rthash[hash], brt, brt_hash); 3145 goto out; 3146 } 3147 3148 do { 3149 dir = bridge_rtnode_addr_cmp(brt->brt_addr, lbrt->brt_addr); 3150 if (dir == 0 && brt->brt_vlan == lbrt->brt_vlan) 3151 return (EEXIST); 3152 if (dir > 0) { 3153 CK_LIST_INSERT_BEFORE(lbrt, brt, brt_hash); 3154 goto out; 3155 } 3156 if (CK_LIST_NEXT(lbrt, brt_hash) == NULL) { 3157 CK_LIST_INSERT_AFTER(lbrt, brt, brt_hash); 3158 goto out; 3159 } 3160 lbrt = CK_LIST_NEXT(lbrt, brt_hash); 3161 } while (lbrt != NULL); 3162 3163 #ifdef DIAGNOSTIC 3164 panic("bridge_rtnode_insert: impossible"); 3165 #endif 3166 3167 out: 3168 CK_LIST_INSERT_HEAD(&sc->sc_rtlist, brt, brt_list); 3169 sc->sc_brtcnt++; 3170 3171 return (0); 3172 } 3173 3174 static void 3175 bridge_rtnode_destroy_cb(struct epoch_context *ctx) 3176 { 3177 struct bridge_rtnode *brt; 3178 3179 brt = __containerof(ctx, struct bridge_rtnode, brt_epoch_ctx); 3180 3181 CURVNET_SET(brt->brt_vnet); 3182 uma_zfree(V_bridge_rtnode_zone, brt); 3183 CURVNET_RESTORE(); 3184 } 3185 3186 /* 3187 * bridge_rtnode_destroy: 3188 * 3189 * Destroy a bridge rtnode. 3190 */ 3191 static void 3192 bridge_rtnode_destroy(struct bridge_softc *sc, struct bridge_rtnode *brt) 3193 { 3194 BRIDGE_RT_LOCK_ASSERT(sc); 3195 3196 CK_LIST_REMOVE(brt, brt_hash); 3197 3198 CK_LIST_REMOVE(brt, brt_list); 3199 sc->sc_brtcnt--; 3200 brt->brt_dst->bif_addrcnt--; 3201 3202 NET_EPOCH_CALL(bridge_rtnode_destroy_cb, &brt->brt_epoch_ctx); 3203 } 3204 3205 /* 3206 * bridge_rtable_expire: 3207 * 3208 * Set the expiry time for all routes on an interface. 3209 */ 3210 static void 3211 bridge_rtable_expire(struct ifnet *ifp, int age) 3212 { 3213 struct bridge_softc *sc = ifp->if_bridge; 3214 struct bridge_rtnode *brt; 3215 3216 CURVNET_SET(ifp->if_vnet); 3217 BRIDGE_RT_LOCK(sc); 3218 3219 /* 3220 * If the age is zero then flush, otherwise set all the expiry times to 3221 * age for the interface 3222 */ 3223 if (age == 0) 3224 bridge_rtdelete(sc, ifp, IFBF_FLUSHDYN); 3225 else { 3226 CK_LIST_FOREACH(brt, &sc->sc_rtlist, brt_list) { 3227 /* Cap the expiry time to 'age' */ 3228 if (brt->brt_ifp == ifp && 3229 brt->brt_expire > time_uptime + age && 3230 (brt->brt_flags & IFBAF_TYPEMASK) == IFBAF_DYNAMIC) 3231 brt->brt_expire = time_uptime + age; 3232 } 3233 } 3234 BRIDGE_RT_UNLOCK(sc); 3235 CURVNET_RESTORE(); 3236 } 3237 3238 /* 3239 * bridge_state_change: 3240 * 3241 * Callback from the bridgestp code when a port changes states. 3242 */ 3243 static void 3244 bridge_state_change(struct ifnet *ifp, int state) 3245 { 3246 struct bridge_softc *sc = ifp->if_bridge; 3247 static const char *stpstates[] = { 3248 "disabled", 3249 "listening", 3250 "learning", 3251 "forwarding", 3252 "blocking", 3253 "discarding" 3254 }; 3255 3256 CURVNET_SET(ifp->if_vnet); 3257 if (V_log_stp) 3258 log(LOG_NOTICE, "%s: state changed to %s on %s\n", 3259 sc->sc_ifp->if_xname, stpstates[state], ifp->if_xname); 3260 CURVNET_RESTORE(); 3261 } 3262 3263 /* 3264 * Send bridge packets through pfil if they are one of the types pfil can deal 3265 * with, or if they are ARP or REVARP. (pfil will pass ARP and REVARP without 3266 * question.) If *bifp or *ifp are NULL then packet filtering is skipped for 3267 * that interface. 3268 */ 3269 static int 3270 bridge_pfil(struct mbuf **mp, struct ifnet *bifp, struct ifnet *ifp, int dir) 3271 { 3272 int snap, error, i, hlen; 3273 struct ether_header *eh1, eh2; 3274 struct ip *ip; 3275 struct llc llc1; 3276 u_int16_t ether_type; 3277 pfil_return_t rv; 3278 3279 snap = 0; 3280 error = -1; /* Default error if not error == 0 */ 3281 3282 #if 0 3283 /* we may return with the IP fields swapped, ensure its not shared */ 3284 KASSERT(M_WRITABLE(*mp), ("%s: modifying a shared mbuf", __func__)); 3285 #endif 3286 3287 if (V_pfil_bridge == 0 && V_pfil_member == 0 && V_pfil_ipfw == 0) 3288 return (0); /* filtering is disabled */ 3289 3290 i = min((*mp)->m_pkthdr.len, max_protohdr); 3291 if ((*mp)->m_len < i) { 3292 *mp = m_pullup(*mp, i); 3293 if (*mp == NULL) { 3294 printf("%s: m_pullup failed\n", __func__); 3295 return (-1); 3296 } 3297 } 3298 3299 eh1 = mtod(*mp, struct ether_header *); 3300 ether_type = ntohs(eh1->ether_type); 3301 3302 /* 3303 * Check for SNAP/LLC. 3304 */ 3305 if (ether_type < ETHERMTU) { 3306 struct llc *llc2 = (struct llc *)(eh1 + 1); 3307 3308 if ((*mp)->m_len >= ETHER_HDR_LEN + 8 && 3309 llc2->llc_dsap == LLC_SNAP_LSAP && 3310 llc2->llc_ssap == LLC_SNAP_LSAP && 3311 llc2->llc_control == LLC_UI) { 3312 ether_type = htons(llc2->llc_un.type_snap.ether_type); 3313 snap = 1; 3314 } 3315 } 3316 3317 /* 3318 * If we're trying to filter bridge traffic, don't look at anything 3319 * other than IP and ARP traffic. If the filter doesn't understand 3320 * IPv6, don't allow IPv6 through the bridge either. This is lame 3321 * since if we really wanted, say, an AppleTalk filter, we are hosed, 3322 * but of course we don't have an AppleTalk filter to begin with. 3323 * (Note that since pfil doesn't understand ARP it will pass *ALL* 3324 * ARP traffic.) 3325 */ 3326 switch (ether_type) { 3327 case ETHERTYPE_ARP: 3328 case ETHERTYPE_REVARP: 3329 if (V_pfil_ipfw_arp == 0) 3330 return (0); /* Automatically pass */ 3331 break; 3332 3333 case ETHERTYPE_IP: 3334 #ifdef INET6 3335 case ETHERTYPE_IPV6: 3336 #endif /* INET6 */ 3337 break; 3338 default: 3339 /* 3340 * Check to see if the user wants to pass non-ip 3341 * packets, these will not be checked by pfil(9) and 3342 * passed unconditionally so the default is to drop. 3343 */ 3344 if (V_pfil_onlyip) 3345 goto bad; 3346 } 3347 3348 /* Run the packet through pfil before stripping link headers */ 3349 if (PFIL_HOOKED_OUT(V_link_pfil_head) && V_pfil_ipfw != 0 && 3350 dir == PFIL_OUT && ifp != NULL) { 3351 switch (pfil_mbuf_out(V_link_pfil_head, mp, ifp, NULL)) { 3352 case PFIL_DROPPED: 3353 return (EACCES); 3354 case PFIL_CONSUMED: 3355 return (0); 3356 } 3357 } 3358 3359 /* Strip off the Ethernet header and keep a copy. */ 3360 m_copydata(*mp, 0, ETHER_HDR_LEN, (caddr_t) &eh2); 3361 m_adj(*mp, ETHER_HDR_LEN); 3362 3363 /* Strip off snap header, if present */ 3364 if (snap) { 3365 m_copydata(*mp, 0, sizeof(struct llc), (caddr_t) &llc1); 3366 m_adj(*mp, sizeof(struct llc)); 3367 } 3368 3369 /* 3370 * Check the IP header for alignment and errors 3371 */ 3372 if (dir == PFIL_IN) { 3373 switch (ether_type) { 3374 case ETHERTYPE_IP: 3375 error = bridge_ip_checkbasic(mp); 3376 break; 3377 #ifdef INET6 3378 case ETHERTYPE_IPV6: 3379 error = bridge_ip6_checkbasic(mp); 3380 break; 3381 #endif /* INET6 */ 3382 default: 3383 error = 0; 3384 } 3385 if (error) 3386 goto bad; 3387 } 3388 3389 error = 0; 3390 3391 /* 3392 * Run the packet through pfil 3393 */ 3394 rv = PFIL_PASS; 3395 switch (ether_type) { 3396 case ETHERTYPE_IP: 3397 /* 3398 * Run pfil on the member interface and the bridge, both can 3399 * be skipped by clearing pfil_member or pfil_bridge. 3400 * 3401 * Keep the order: 3402 * in_if -> bridge_if -> out_if 3403 */ 3404 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 3405 pfil_mbuf_out(V_inet_pfil_head, mp, bifp, NULL)) != 3406 PFIL_PASS) 3407 break; 3408 3409 if (V_pfil_member && ifp != NULL) { 3410 rv = (dir == PFIL_OUT) ? 3411 pfil_mbuf_out(V_inet_pfil_head, mp, ifp, NULL) : 3412 pfil_mbuf_in(V_inet_pfil_head, mp, ifp, NULL); 3413 if (rv != PFIL_PASS) 3414 break; 3415 } 3416 3417 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 3418 pfil_mbuf_in(V_inet_pfil_head, mp, bifp, NULL)) != 3419 PFIL_PASS) 3420 break; 3421 3422 /* check if we need to fragment the packet */ 3423 /* bridge_fragment generates a mbuf chain of packets */ 3424 /* that already include eth headers */ 3425 if (V_pfil_member && ifp != NULL && dir == PFIL_OUT) { 3426 i = (*mp)->m_pkthdr.len; 3427 if (i > ifp->if_mtu) { 3428 error = bridge_fragment(ifp, mp, &eh2, snap, 3429 &llc1); 3430 return (error); 3431 } 3432 } 3433 3434 /* Recalculate the ip checksum. */ 3435 ip = mtod(*mp, struct ip *); 3436 hlen = ip->ip_hl << 2; 3437 if (hlen < sizeof(struct ip)) 3438 goto bad; 3439 if (hlen > (*mp)->m_len) { 3440 if ((*mp = m_pullup(*mp, hlen)) == NULL) 3441 goto bad; 3442 ip = mtod(*mp, struct ip *); 3443 if (ip == NULL) 3444 goto bad; 3445 } 3446 ip->ip_sum = 0; 3447 if (hlen == sizeof(struct ip)) 3448 ip->ip_sum = in_cksum_hdr(ip); 3449 else 3450 ip->ip_sum = in_cksum(*mp, hlen); 3451 3452 break; 3453 #ifdef INET6 3454 case ETHERTYPE_IPV6: 3455 if (V_pfil_bridge && dir == PFIL_OUT && bifp != NULL && (rv = 3456 pfil_mbuf_out(V_inet6_pfil_head, mp, bifp, NULL)) != 3457 PFIL_PASS) 3458 break; 3459 3460 if (V_pfil_member && ifp != NULL) { 3461 rv = (dir == PFIL_OUT) ? 3462 pfil_mbuf_out(V_inet6_pfil_head, mp, ifp, NULL) : 3463 pfil_mbuf_in(V_inet6_pfil_head, mp, ifp, NULL); 3464 if (rv != PFIL_PASS) 3465 break; 3466 } 3467 3468 if (V_pfil_bridge && dir == PFIL_IN && bifp != NULL && (rv = 3469 pfil_mbuf_in(V_inet6_pfil_head, mp, bifp, NULL)) != 3470 PFIL_PASS) 3471 break; 3472 break; 3473 #endif 3474 } 3475 3476 switch (rv) { 3477 case PFIL_CONSUMED: 3478 return (0); 3479 case PFIL_DROPPED: 3480 return (EACCES); 3481 default: 3482 break; 3483 } 3484 3485 error = -1; 3486 3487 /* 3488 * Finally, put everything back the way it was and return 3489 */ 3490 if (snap) { 3491 M_PREPEND(*mp, sizeof(struct llc), M_NOWAIT); 3492 if (*mp == NULL) 3493 return (error); 3494 bcopy(&llc1, mtod(*mp, caddr_t), sizeof(struct llc)); 3495 } 3496 3497 M_PREPEND(*mp, ETHER_HDR_LEN, M_NOWAIT); 3498 if (*mp == NULL) 3499 return (error); 3500 bcopy(&eh2, mtod(*mp, caddr_t), ETHER_HDR_LEN); 3501 3502 return (0); 3503 3504 bad: 3505 m_freem(*mp); 3506 *mp = NULL; 3507 return (error); 3508 } 3509 3510 /* 3511 * Perform basic checks on header size since 3512 * pfil assumes ip_input has already processed 3513 * it for it. Cut-and-pasted from ip_input.c. 3514 * Given how simple the IPv6 version is, 3515 * does the IPv4 version really need to be 3516 * this complicated? 3517 * 3518 * XXX Should we update ipstat here, or not? 3519 * XXX Right now we update ipstat but not 3520 * XXX csum_counter. 3521 */ 3522 static int 3523 bridge_ip_checkbasic(struct mbuf **mp) 3524 { 3525 struct mbuf *m = *mp; 3526 struct ip *ip; 3527 int len, hlen; 3528 u_short sum; 3529 3530 if (*mp == NULL) 3531 return (-1); 3532 3533 if (IP_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3534 if ((m = m_copyup(m, sizeof(struct ip), 3535 (max_linkhdr + 3) & ~3)) == NULL) { 3536 /* XXXJRT new stat, please */ 3537 KMOD_IPSTAT_INC(ips_toosmall); 3538 goto bad; 3539 } 3540 } else if (__predict_false(m->m_len < sizeof (struct ip))) { 3541 if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { 3542 KMOD_IPSTAT_INC(ips_toosmall); 3543 goto bad; 3544 } 3545 } 3546 ip = mtod(m, struct ip *); 3547 if (ip == NULL) goto bad; 3548 3549 if (ip->ip_v != IPVERSION) { 3550 KMOD_IPSTAT_INC(ips_badvers); 3551 goto bad; 3552 } 3553 hlen = ip->ip_hl << 2; 3554 if (hlen < sizeof(struct ip)) { /* minimum header length */ 3555 KMOD_IPSTAT_INC(ips_badhlen); 3556 goto bad; 3557 } 3558 if (hlen > m->m_len) { 3559 if ((m = m_pullup(m, hlen)) == NULL) { 3560 KMOD_IPSTAT_INC(ips_badhlen); 3561 goto bad; 3562 } 3563 ip = mtod(m, struct ip *); 3564 if (ip == NULL) goto bad; 3565 } 3566 3567 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 3568 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 3569 } else { 3570 if (hlen == sizeof(struct ip)) { 3571 sum = in_cksum_hdr(ip); 3572 } else { 3573 sum = in_cksum(m, hlen); 3574 } 3575 } 3576 if (sum) { 3577 KMOD_IPSTAT_INC(ips_badsum); 3578 goto bad; 3579 } 3580 3581 /* Retrieve the packet length. */ 3582 len = ntohs(ip->ip_len); 3583 3584 /* 3585 * Check for additional length bogosity 3586 */ 3587 if (len < hlen) { 3588 KMOD_IPSTAT_INC(ips_badlen); 3589 goto bad; 3590 } 3591 3592 /* 3593 * Check that the amount of data in the buffers 3594 * is as at least much as the IP header would have us expect. 3595 * Drop packet if shorter than we expect. 3596 */ 3597 if (m->m_pkthdr.len < len) { 3598 KMOD_IPSTAT_INC(ips_tooshort); 3599 goto bad; 3600 } 3601 3602 /* Checks out, proceed */ 3603 *mp = m; 3604 return (0); 3605 3606 bad: 3607 *mp = m; 3608 return (-1); 3609 } 3610 3611 #ifdef INET6 3612 /* 3613 * Same as above, but for IPv6. 3614 * Cut-and-pasted from ip6_input.c. 3615 * XXX Should we update ip6stat, or not? 3616 */ 3617 static int 3618 bridge_ip6_checkbasic(struct mbuf **mp) 3619 { 3620 struct mbuf *m = *mp; 3621 struct ip6_hdr *ip6; 3622 3623 /* 3624 * If the IPv6 header is not aligned, slurp it up into a new 3625 * mbuf with space for link headers, in the event we forward 3626 * it. Otherwise, if it is aligned, make sure the entire base 3627 * IPv6 header is in the first mbuf of the chain. 3628 */ 3629 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 3630 struct ifnet *inifp = m->m_pkthdr.rcvif; 3631 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 3632 (max_linkhdr + 3) & ~3)) == NULL) { 3633 /* XXXJRT new stat, please */ 3634 IP6STAT_INC(ip6s_toosmall); 3635 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3636 goto bad; 3637 } 3638 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 3639 struct ifnet *inifp = m->m_pkthdr.rcvif; 3640 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 3641 IP6STAT_INC(ip6s_toosmall); 3642 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 3643 goto bad; 3644 } 3645 } 3646 3647 ip6 = mtod(m, struct ip6_hdr *); 3648 3649 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 3650 IP6STAT_INC(ip6s_badvers); 3651 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 3652 goto bad; 3653 } 3654 3655 /* Checks out, proceed */ 3656 *mp = m; 3657 return (0); 3658 3659 bad: 3660 *mp = m; 3661 return (-1); 3662 } 3663 #endif /* INET6 */ 3664 3665 /* 3666 * bridge_fragment: 3667 * 3668 * Fragment mbuf chain in multiple packets and prepend ethernet header. 3669 */ 3670 static int 3671 bridge_fragment(struct ifnet *ifp, struct mbuf **mp, struct ether_header *eh, 3672 int snap, struct llc *llc) 3673 { 3674 struct mbuf *m = *mp, *nextpkt = NULL, *mprev = NULL, *mcur = NULL; 3675 struct ip *ip; 3676 int error = -1; 3677 3678 if (m->m_len < sizeof(struct ip) && 3679 (m = m_pullup(m, sizeof(struct ip))) == NULL) 3680 goto dropit; 3681 ip = mtod(m, struct ip *); 3682 3683 m->m_pkthdr.csum_flags |= CSUM_IP; 3684 error = ip_fragment(ip, &m, ifp->if_mtu, ifp->if_hwassist); 3685 if (error) 3686 goto dropit; 3687 3688 /* 3689 * Walk the chain and re-add the Ethernet header for 3690 * each mbuf packet. 3691 */ 3692 for (mcur = m; mcur; mcur = mcur->m_nextpkt) { 3693 nextpkt = mcur->m_nextpkt; 3694 mcur->m_nextpkt = NULL; 3695 if (snap) { 3696 M_PREPEND(mcur, sizeof(struct llc), M_NOWAIT); 3697 if (mcur == NULL) { 3698 error = ENOBUFS; 3699 if (mprev != NULL) 3700 mprev->m_nextpkt = nextpkt; 3701 goto dropit; 3702 } 3703 bcopy(llc, mtod(mcur, caddr_t),sizeof(struct llc)); 3704 } 3705 3706 M_PREPEND(mcur, ETHER_HDR_LEN, M_NOWAIT); 3707 if (mcur == NULL) { 3708 error = ENOBUFS; 3709 if (mprev != NULL) 3710 mprev->m_nextpkt = nextpkt; 3711 goto dropit; 3712 } 3713 bcopy(eh, mtod(mcur, caddr_t), ETHER_HDR_LEN); 3714 3715 /* 3716 * The previous two M_PREPEND could have inserted one or two 3717 * mbufs in front so we have to update the previous packet's 3718 * m_nextpkt. 3719 */ 3720 mcur->m_nextpkt = nextpkt; 3721 if (mprev != NULL) 3722 mprev->m_nextpkt = mcur; 3723 else { 3724 /* The first mbuf in the original chain needs to be 3725 * updated. */ 3726 *mp = mcur; 3727 } 3728 mprev = mcur; 3729 } 3730 3731 KMOD_IPSTAT_INC(ips_fragmented); 3732 return (error); 3733 3734 dropit: 3735 for (mcur = *mp; mcur; mcur = m) { /* droping the full packet chain */ 3736 m = mcur->m_nextpkt; 3737 m_freem(mcur); 3738 } 3739 return (error); 3740 } 3741 3742 static void 3743 bridge_linkstate(struct ifnet *ifp) 3744 { 3745 struct bridge_softc *sc = ifp->if_bridge; 3746 struct bridge_iflist *bif; 3747 struct epoch_tracker et; 3748 3749 NET_EPOCH_ENTER(et); 3750 3751 bif = bridge_lookup_member_if(sc, ifp); 3752 if (bif == NULL) { 3753 NET_EPOCH_EXIT(et); 3754 return; 3755 } 3756 bridge_linkcheck(sc); 3757 3758 bstp_linkstate(&bif->bif_stp); 3759 3760 NET_EPOCH_EXIT(et); 3761 } 3762 3763 static void 3764 bridge_linkcheck(struct bridge_softc *sc) 3765 { 3766 struct bridge_iflist *bif; 3767 int new_link, hasls; 3768 3769 BRIDGE_LOCK_OR_NET_EPOCH_ASSERT(sc); 3770 3771 new_link = LINK_STATE_DOWN; 3772 hasls = 0; 3773 /* Our link is considered up if at least one of our ports is active */ 3774 CK_LIST_FOREACH(bif, &sc->sc_iflist, bif_next) { 3775 if (bif->bif_ifp->if_capabilities & IFCAP_LINKSTATE) 3776 hasls++; 3777 if (bif->bif_ifp->if_link_state == LINK_STATE_UP) { 3778 new_link = LINK_STATE_UP; 3779 break; 3780 } 3781 } 3782 if (!CK_LIST_EMPTY(&sc->sc_iflist) && !hasls) { 3783 /* If no interfaces support link-state then we default to up */ 3784 new_link = LINK_STATE_UP; 3785 } 3786 if_link_state_change(sc->sc_ifp, new_link); 3787 } 3788